Just like completion doesn't show deprecated commands, I think that help
should not list them, so that we don't incite users to use them.
gdb/ChangeLog:
* cli/cli-decode.c (help_cmd_list): Do not list commands that
are deprecated.
With current FSF GDB HEAD and old FSF gdbserver I expected I could do:
gdb -ex 'file target:/root/redhat/threadit' -ex 'target remote :1234'
(supplying that unsupported qXfer:exec-file:read by "file")
But that does not work because:
Sending packet: $vFile:setfs:0#bf...Packet received: OK
Packet vFile:setfs (hostio-setfs) is supported
...
Sending packet: $vFile:setfs:104#24...Packet received: OK
"target:/root/redhat/threadit": could not open as an executable file: Invalid argument
GDB documentation says:
The valid responses to Host I/O packets are:
An empty response indicates that this operation is not recognized.
This "empty response" vs. "OK" was a bug in gdbserver < 7.7. It was fixed by:
commit e7f0d979dd
Author: Yao Qi <yao@codesourcery.com>
Date: Tue Dec 10 21:59:20 2013 +0800
Fix a bug in matching notifications.
Message-ID: <1386684626-11415-1-git-send-email-yao@codesourcery.com>
https://sourceware.org/ml/gdb-patches/2013-12/msg00373.html
2013-12-10 Yao Qi <yao@codesourcery.com>
* notif.c (handle_notif_ack): Return 0 if no notification
matches.
with unpatched old FSF gdbserver and patched FSF GDB HEAD:
gdb -ex 'file target:/root/redhat/threadit' -ex 'target remote :1234'
Sending packet: $vFile:setfs:0#bf...Packet received: OK
Packet vFile:setfs (hostio-setfs) is NOT supported
...
(gdb) info sharedlibrary
From To Syms Read Shared Object Library
0x00007ffff7ddbae0 0x00007ffff7df627a Yes (*) target:/lib64/ld-linux-x86-64.so.2
0x00007ffff7bc48a0 0x00007ffff7bcf514 Yes (*) target:/lib64/libpthread.so.0
gdb/ChangeLog
2016-04-26 Jan Kratochvil <jan.kratochvil@redhat.com>
* remote.c (remote_start_remote): Detect PACKET_vFile_setfs.support.
Currently c_value_print will turn struct reference values into pointers before
doing a set of RTTI checks. This was introduced as a fix to PR c++/15401.
If there's RTTI the pointer will be adjusted and converted back to a reference.
However, if there's no RTTI the value will still be treated as a pointer during
the remainder of the function.
This patch moves the conversion down so that it's always performed when needed.
Notice this currently has not user-visible effects, so can be seen as a small
code cleanup. However, it'll be necessary for the bug-fix for handling
synthetic C++ references. It causes no testsuite regressions.
gdb/ChangeLog:
2016-04-26 Martin Galvan <martin.galvan@tallertechnologies.com>
* c-valprint.c (c_value_print): Always convert val back to reference
type if we converted it to a pointer type.
In some babeltrace versions before 1.2.0, the header file iterator.h
declares the enum values `BT_SEEK_*' within the struct declaration of
bt_iter_pos. The enum values are supposed to be globally-scoped, which
works for C, but not for C++. Later babeltrace versions declare the
enum outside the struct:
https://lists.lttng.org/pipermail/lttng-dev/2013-September/021411.html
Now that GDB is compiled with C++, the GDB build fails on a system with
an affected babeltrace version: the compiler complains about a missing
declaration of BT_SEEK_BEGIN in ctf.c.
This patch enhances the configure check to recognize such babeltrace
versions as unusable for GDB.
gdb/ChangeLog:
* configure.ac: Enhance configure check for babeltrace to reject
non-C++-enabled versions.
* configure: Regenerate.
Instead of pre-computing indices into a fortran array re-use
the value_* interfaces to subscript a fortran array.
The benefit of using the new interface is that it takes care of
dynamic types and resolve them when needed.
This fixes issues when printing structures with dynamic arrays from toplevel.
Before:
(gdb) p twov
$1 = ( (( ( 6352320, 0, -66, -1, 267) ( 343476, 1, -15, 1, 0) ( 5, 0, 5, 0, 1) ...
After:
(gdb) p twov
$1 = ( (( ( 1, 1, 1, 1, 1) ( 1, 1, 321, 1, 1) ( 1, 1, 1, 1, 1) ...
2016-04-26 Sanimir Agovic <sanimir.agovic@intel.com>
Keven Boell <keven.boell@intel.com>
Bernhard Heckel <bernhard.heckel@intel.com>
gdb/Changelog:
* f-valprint.c (f77_create_arrayprint_offset_tbl): Remove
function.
(F77_DIM_SIZE, F77_DIM_OFFSET): Remove macro.
(f77_print_array_1): Use value_subscript to subscript a
value array.
(f77_print_array): Remove call to f77_create_arrayprint_offset_tbl.
(f_val_print): Use value_field to construct a field value.
gdb/testsuite/Changelog:
* vla-type.exp: Print structure from toplevel.
Resolve type of an array's element to be printed in case it is dynamic.
Otherwise we don't use the correct boundaries nor the right location.
Before:
ptype fivearr(1)
type = Type five
Type one
integer(kind=4) :: ivla(34196784:34196832,34197072:34197120,34197360:34197408)
End Type one :: tone
End Type five
After:
ptype fivearr(1)
type = Type five
Type one
integer(kind=4) :: ivla(2,4,6)
End Type one :: tone
End Type five
2016-04-26 Bernhard Heckel <bernhard.heckel@intel.com>
gdb/Changelog:
* valarith.c (value_address): Resolve dynamic types.
gdb/testsuite/Changelog:
* gdb.fortran/vla-type.f90: Add test for static and dynamic arrays
of dynamic types.
* gdb.fortran/vla-type.exp: Add test for static and dynamic arrays
of dynamic types.
Fortran supports dynamic types for which bounds, size and location
can vary during their lifetime. As a result of the dynamic
behaviour, they have to be resolved at every query.
This patch will resolve the type of a structure field when it
is dynamic.
2016-04-26 Bernhard Heckel <bernhard.heckel@intel.com>
2016-04-26 Keven Boell <keven.boell@intel.com>
Before:
(gdb) print threev%ivla(1)
Cannot access memory at address 0x3
(gdb) print threev%ivla(5)
no such vector element
After:
(gdb) print threev%ivla(1)
$9 = 1
(gdb) print threev%ivla(5)
$10 = 42
gdb/Changelog:
* NEWS: Add new supported features for fortran.
* gdbtypes.c (remove_dyn_prop): New.
(resolve_dynamic_struct): Keep type length for fortran structs.
* gdbtypes.h: Forward declaration of new function.
* value.c (value_address): Return dynamic resolved location of a value.
(set_value_component_location): Adjust the value address
for single value prints.
(value_primitive_field): Support value types with a dynamic location.
(set_internalvar): Remove dynamic location property of
internal variables.
gdb/testsuite/Changelog:
* gdb.fortran/vla-type.f90: New file.
* gdb.fortran/vla-type.exp: New file.
When GDBserver inserts a breakpoint, it looks for raw breakpoint, if
the raw breakpoint is found, increase its refcount, and return. This
doesn't work when it steps over a breakpoint using software single
step and the underneath instruction of breakpoint is branch to self.
When stepping over a breakpoint on ADDR using software single step,
GDBserver uninsert the breakpoint, so the corresponding raw breakpoint
RAW's 'inserted' flag is zero. Then, GDBserver insert single step
breakpoint at the same address ADDR because the instruction is branch
to self, the same raw brekapoint RAW is found, and increase the
refcount. However, the raw breakpoint is not inserted, and the
program won't stop.
gdb/gdbserver:
2016-04-25 Pedro Alves <palves@redhat.com>
Yao Qi <yao.qi@linaro.org>
* mem-break.c (set_raw_breakpoint_at): Create a raw breakpoint
object. Insert it if it is not inserted yet. Increase the
refcount and link it into the proc's raw breakpoint list.
GDB doesn't insert software single step breakpoint if the instruction
branches to itself, so that the program can't stop after command "si".
(gdb) b 32
Breakpoint 2 at 0x8680: file git/gdb/testsuite/gdb.base/branch-to-self.c, line 32.
(gdb) c
Continuing.
Breakpoint 2, main () at gdb/git/gdb/testsuite/gdb.base/branch-to-self.c:32
32 asm (".Lhere: " BRANCH_INSN " .Lhere"); /* loop-line */
(gdb) si
infrun: clear_proceed_status_thread (Thread 3991.3991)
infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: step-over queue now empty
infrun: resuming [Thread 3991.3991] for step-over
infrun: skipping breakpoint: stepping past insn at: 0x8680
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sending packet: $Z0,8678,4#f3...Packet received: OK
infrun: skipping breakpoint: stepping past insn at: 0x8680
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sending packet: $Z0,b6fe86c8,4#82...Packet received: OK
infrun: resume (step=1, signal=GDB_SIGNAL_0), trap_expected=1, current thread [Thread 3991.3991] at 0x868
breakpoint.c:should_be_inserted thinks the breakpoint shouldn't be
inserted, which is wrong. This patch restrict the condition that
only skip the non-single-step breakpoints if they are inserted at
the place we are stepping over, however we don't want to skip
single-step breakpoint if its thread is the thread we are stepping
over, so in this patch, I add a thread num in 'struct step_over_info'
to record the thread we're stepping over.
gdb:
2016-04-25 Yao Qi <yao.qi@linaro.org>
* breakpoint.c (should_be_inserted): Return 0 if the location's
owner is not single step breakpoint or single step breakpoint's
thread isn't the thread which is stepping past a breakpoint.
* gdbarch.sh (software_single_step): Update comments.
* gdbarch.h: Regenerated.
* infrun.c (struct step_over_info) <thread>: New field.
(set_step_over_info): New argument 'thread'. Callers updated.
(clear_step_over_info): Set field thread to -1.
(thread_is_stepping_over_breakpoint): New function.
* infrun.h (thread_is_stepping_over_breakpoint): Declaration.
gdb/ChangeLog
* ppc-linux-nat.c (ppc_linux_read_description): Use PPC_FEATURE_HAS_VSX
and PPC_FEATURE_HAS_ALTIVEC to check if such features are available.
Before this patch
https://sourceware.org/ml/gdb-patches/2014-02/msg00709.html
read_value_memory checks parameter 'stack', and call read_stack or
read_memory respectively. However, 'stack' is not checked and
TARGET_OBJECT_MEMORY is always used in target_xfer_partial, which is
a mistake in the patch above.
This patch checks parameter 'stack', and choose TARGET_OBJECT_MEMORY
or TARGET_OBJECT_STACK_MEMORY accordingly.
gdb:
2016-04-22 Yao Qi <yao.qi@linaro.org>
* valops.c (read_value_memory): New local variable 'stack'.
Set it to either TARGET_OBJECT_STACK_MEMORY or
TARGET_OBJECT_MEMORY.
This factors out all the yy-variables remapping to a single file,
instead of each parser having to do the same, with different prefixes.
With this, a parser just needs to define the prefix they want and
include yy-remap.h, which does the dirty job.
Note this renames the c_error, ada_error, etc. functions. Writing the
remapping pattern as:
#define yyerror GDB_YY_REMAP (error)
instead of:
#define yyerror GDB_YY_REMAP (yyerror)
would have avoided the renaming. However, that would be problematic
if we have a macro 'foo' in scope, when we write:
#define yyfoo GDB_YY_REMAP (foo)
as that would expand 'foo'.
The c_yyerror etc. naming end ups indicating that this is a yacc
related function more clearly, so feels like a good change, anyway.
gdb/ChangeLog:
2016-04-22 Pedro Alves <palves@redhat.com>
* ada-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* ada-lang.c (ada_language_defn): Adjust.
* ada-lang.h (ada_error): Rename to ...
(ada_yyerror): ... this.
* c-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* c-lang.c (c_language_defn, cplus_language_defn)
(asm_language_defn, minimal_language_defn): Adjust.
* c-lang.h (c_error): Rename to ...
(c_yyerror): ... this.
* d-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* d-lang.c (d_language_defn): Adjust.
* d-lang.h (d_error): Rename to ...
(d_yyerror): ... this.
* f-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* f-lang.c (f_language_defn): Adjust.
* f-lang.h (f_error): Rename to ...
(f_yyerror): ... this.
* go-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* go-lang.c (go_language_defn): Adjust.
* go-lang.h (go_error): Rename to ...
(go_yyerror): ... this.
* jv-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* jv-lang.c (java_language_defn): Adjust.
* jv-lang.h (java_error): Rename to ...
(java_yyerror): ... this.
* m2-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* m2-lang.c (m2_language_defn): Adjust.
* m2-lang.h (m2_error): Rename to ...
(m2_yyerror): ... this.
* objc-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* objc-lang.c (objc_language_defn): Adjust.
* opencl-lang.c (opencl_language_defn): Adjust.
* p-exp.y: Remove all yy symbol remappings.
(GDB_YY_REMAP_PREFIX): Define.
Include "yy-remap.h".
* p-lang.c (pascal_language_defn): Adjust.
* p-lang.h (pascal_error): Rename to ...
(pascal_yyerror): ... this.
* yy-remap.h: New file.
The exceptions-across-readline issue was fixed by the previous commit.
Let's try this again.
gdb/ChangeLog:
2016-04-22 Pedro Alves <palves@redhat.com>
* common/common-exceptions.h (GDB_XCPT_TRY): Remove mention of
the foreign frames issue.
[__cplusplus] (GDB_XCPT): Define as GDB_XCPT_TRY.
If we map GDB'S TRY/CATCH macros to C++ try/catch, GDB breaks on
systems where readline isn't built with exceptions support. The
problem is that readline calls into GDB through the callback
interface, and if GDB's callback throws a C++ exception/error, the
system unwinder won't manage to unwind past the readline frame, and
ends up calling std::terminate(), which aborts the process:
(gdb) whatever-command-that-causes-an-error
terminate called after throwing an instance of 'gdb_exception_RETURN_MASK_ERROR'
Aborted
$
This went unnoticed for so long because:
- the x86-64 ABI requires -fasynchronous-unwind-tables, making it
possible for exceptions to cross readline with no special handling.
But e.g., on ARM or AIX, unless you build readline with
-fexceptions, you trip on the problem.
- TRY/CATCH was mapped to setjmp/longjmp, even in C++ mode, until
quite recently.
The fix is to catch and save any GDB exception that is thrown inside
the GDB readline callback, and then once the callback returns back to
the GDB code that called into readline in the first place, rethrow the
saved GDB exception.
This is similar in spirit to how we catch/map GDB exceptions at the
GDB/Python and GDB/Guile API boundaries.
The next question is then: if we intercept all exceptions within GDB's
readline callback, should we simply return normally to readline? The
callback prototype has no way to signal an error back to readline (*).
The answer is no -- if we return normally, we'll be returning to a
loop inside rl_callback_read_char that continues processing pending
input, calling into GDB again, redisplaying the prompt, etc. Thus if
we want to error out of rl_callback_read_char, we need to long jump
across it, just like we always did before TRY/CATCH were ever mapped
to C++ exceptions.
My first approach built a specialized API to handle this, with a
couple macros to hide the setjmp/longjmp and the struct gdb_exception
saving/rethrowing.
However, I realized that we need to:
- Handle multiple active rl_callback_read_char invocations. If,
while processing input something triggers a secondary prompt, we
end up in a nested rl_callback_read_char call, through
gdb_readline_wrapper.
- Propagate a struct gdb_exception along with the longjmp.
... and that this is exactly what the setjmp/longjmp-based TRY/CATCH
does.
So the fix makes the setjmp/longjmp TRY/CATCH always available under
new TRY_SJLJ/CATCH_SJLJ aliases, even when TRY/CATCH is mapped to C++
try/catch, and then uses TRY_SJLJ/CATCH_SJLJ to propagate GDB
exceptions across the readline callback.
This turns out to be a much better looking fix than my bespoke API
attempt, even. We'll probably be able to simplify TRY_SJLJ/CATCH_SJLJ
when we finally get rid of TRY/CATCH all over the tree, but until
then, this reuse seems quite nice for avoiding a second parallel
setjmp/longjmp mechanism.
(*) - maybe we could propose a readline API change, but we still need
to handle current readline, anyway.
gdb/ChangeLog:
2016-04-22 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (enum catcher_state, struct catcher)
(current_catcher): Define in C++ mode too.
(exceptions_state_mc_catch): Call throw_exception_sjlj instead of
throw_exception.
(throw_exception_sjlj, throw_exception_cxx): New functions,
factored out from throw_exception.
(throw_exception): Reimplement.
* common/common-exceptions.h (exceptions_state_mc_init)
(exceptions_state_mc_action_iter)
(exceptions_state_mc_action_iter_1, exceptions_state_mc_catch):
Declare in C++ mode too.
(TRY): Rename to ...
(TRY_SJLJ): ... this.
(CATCH): Rename to ...
(CATCH_SJLJ): ... this.
(END_CATCH): Rename to ...
(END_CATCH_SJLJ): ... this.
[GDB_XCPT == GDB_XCPT_SJMP] (TRY, CATCH, END_CATCH): Map to SJLJ
equivalents.
(throw_exception): Update comments.
(throw_exception_sjlj): Declare.
* event-top.c (gdb_rl_callback_read_char_wrapper): Extend intro
comment. Wrap body in TRY_SJLJ/CATCH_SJLJ and rethrow any
intercepted exception.
(gdb_rl_callback_handler): New function.
(gdb_rl_callback_handler_install): Always install
gdb_rl_callback_handler as readline callback.
Use the "gdb_rl_" prefix like other gdb readline function wrappers to
make it clear this is a gdb function, not a readline function.
gdb/ChangeLog:
2016-04-22 Pedro Alves <palves@redhat.com>
* event-top.c (rl_callback_read_char_wrapper): Rename to ...
(gdb_rl_callback_read_char_wrapper): ... this.
(change_line_handler, gdb_setup_readline): Adjust.
Bits 20 ~ 23 of CPSR are reserved (RAZ, read as zero), but they are not
zero if the arm program runs on aarch64-linux. AArch64 tracer gets PSTATE
from arm 32-bit tracee as CPSR, but bits 20 ~ 23 are used in PSTATE. I
think kernel should clear these bits when it is read through ptrace, but
the fix in user space is still needed.
This patch fixes these two fails,
-FAIL: gdb.reverse/insn-reverse.exp: ext_reg_push_pop: compare registers on insn 0:vldr d7, [r11, #-12]
-FAIL: gdb.reverse/insn-reverse.exp: ext_reg_push_pop: compare registers on insn 0:vldr d7, [r7]
gdb:
2016-04-22 Yao Qi <yao.qi@linaro.org>
* aarch32-linux-nat.c (aarch32_gp_regcache_supply): Clear CPSR
bits 20 to 23.
gdb/gdbserver:
2016-04-22 Yao Qi <yao.qi@linaro.org>
* linux-aarch32-low.c (arm_store_gregset): Clear CPSR bits 20
to 23.
Set the number of registers for non-XML-described Linux targets to 90,
reverting a change made here with the addition of DSP register support:
commit 1faeff088b
Author: Maciej W. Rozycki <macro@linux-mips.org>
Date: Thu Mar 1 22:19:48 2012 +0000
and fixing a regression introduced for legacy `gdbserver' targets
causing a "Remote 'g' packet reply is too long" error message where the
amount of register data received with a `g' packet (90) exceeds the
maximum number of registers expected (79).
Update the setting for XML-described targets, reflecting the actual
number of registers which have been assigned numbers, matching the:
gdb_assert (gdbarch_num_regs (gdbarch) <= MIPS_RESTART_REGNUM);
requirement in `mips_linux_init_abi'.
gdb/
* mips-tdep.c (mips_gdbarch_init): For GDB_OSABI_LINUX set
`num_regs' to 90 rather than 79. Where a target description is
present adjust the setting appropriately.
We don't currently handle the case of gdb's readline callback throwing
gdb C++ exceptions across a readline that wasn't built with
-fexceptions. The end result is:
(gdb) whatever-command-that-causes-an-error
terminate called after throwing an instance of 'gdb_exception_RETURN_MASK_ERROR'
Aborted
$
Until that is fixed, revert back to sjlj-based exceptions again.
gdb/ChangeLog:
2016-04-21 Pedro Alves <palves@redhat.com>
* common/common-exceptions.h (GDB_XCPT_TRY): Add comment.
(GDB_XCPT): Always define as GDB_XCPT_SJMP.
We currently get:
../../src/gdb/aix-thread.c: In function 'int pdc_read_data(pthdb_user_t, void*, pthdb_addr_t, size_t)':
../../src/gdb/aix-thread.c:465:46: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
status = target_read_memory (addr, buf, len);
^
../../src/gdb/aix-thread.c: In function 'void aix_thread_resume(target_ops*, ptid_t, int, gdb_signal)':
../../src/gdb/aix-thread.c:1010:46: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
gdb_signal_to_host (sig), (void *) tid);
^
../../src/gdb/aix-thread.c:243:1: error: initializing argument 5 of 'int ptrace64aix(int, int, long long int, int, int*)' [-fpermissive]
ptrace64aix (int req, int id, long long addr, int data, int *buf)
../../src/gdb/rs6000-nat.c: In function 'gdb_byte* rs6000_ptrace_ldinfo(ptid_t)':
../../src/gdb/rs6000-nat.c:596:36: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
gdb_byte *ldi = xmalloc (ldi_size);
^
../../src/gdb/rs6000-nat.c:615:36: error: invalid conversion from 'void*' to 'gdb_byte* {aka unsigned char*}' [-fpermissive]
ldi = xrealloc (ldi, ldi_size);
^
(and more instances of the same).
gdb/ChangeLog:
2016-04-21 Pedro Alves <palves@redhat.com>
* aix-thread.c (pdc_read_data, pdc_write_data): Add cast.
(aix_thread_resume): Use PTRACE_TYPE_ARG5.
* rs6000-nat.c (rs6000_ptrace64): Use PTRACE_TYPE_ARG5.
(rs6000_ptrace_ldinfo): Change type of 'ldi' local to void
pointer, and cast return to gdb_byte pointer.
Now that gdb/gdbserver compile as C++ programs by default, the s390
GNU/Linux build started failing with:
In file included from ../../src/gdb/common/common-defs.h:64:0,
from ../../src/gdb/defs.h:28,
from ../../src/gdb/s390-linux-nat.c:22:
../../src/gdb/s390-linux-nat.c: In function ‘void fetch_regset(regcache*, int, int, int, const regset*)’:
../../src/gdb/../include/libiberty.h:711:38: error: invalid conversion from ‘void*’ to ‘gdb_byte* {aka unsigned char*}’ [-fpermissive]
# define alloca(x) __builtin_alloca(x)
^
../../src/gdb/s390-linux-nat.c:297:19: note: in expansion of macro ‘alloca’
gdb_byte *buf = alloca (regsize);
^
etc.
gdb/ChangeLog:
2016-04-21 Pedro Alves <palves@redhat.com>
* s390-linux-nat.c (fetch_regset, store_regset, check_regset): Use
void * instead of gdb_byte *.
gdb/gdbserver/ChangeLog:
2016-04-21 Pedro Alves <palves@redhat.com>
* linux-s390-low.c (s390_collect_ptrace_register)
(s390_supply_ptrace_register, s390_get_hwcap): Use gdb_byte * and
add casts.
(s390_check_regset): Use void * instead of gdb_byte *.
This makes --enable-build-with-cxx be "yes" by default.
One must now configure with --enable-build-with-cxx=no in order to
build with a C compiler.
gdb/ChangeLog:
2016-04-20 Pedro Alves <palves@redhat.com>
* build-with-cxx.m4 (GDB_AC_BUILD_WITH_CXX): Default to yes.
* configure: Renegerate.
gdb/gdbserver/ChangeLog:
2016-04-20 Pedro Alves <palves@redhat.com>
* configure: Renegerate.
Building in C++ mode caught a bug here:
.../src/gdb/darwin-nat.c: In function 'ptid_t darwin_decode_message(mach_msg_header_t*, darwin_thread_t**, inferior**, target_waitstatus*)':
.../src/gdb/darwin-nat.c:1016:25: error: invalid conversion from 'int' to 'gdb_signal' [-fpermissive]
status->value.sig = WTERMSIG (wstatus);
^
gdb/ChangeLog:
2016-04-20 Pedro Alves <palves@redhat.com>
* darwin-nat.c (darwin_decode_message): Use gdb_signal_from_host.
Fixes, with x86_64-apple-darwin15-gcc (gcc 5.3.0):
.../src/gdb/aarch64-tdep.c: In function 'aarch64_record_load_store':
.../src/gdb/aarch64-tdep.c:3479:67: error: passing argument 3 of 'regcache_raw_read_unsigned' from incompatible pointer type [-Werror=incompatible-pointer-types]
bits (aarch64_insn_r->aarch64_insn, 16, 20), ®_rm_val);
^
In file included from .../src/gdb/regcache.h:23:0,
from .../src/gdb/gdbarch.h:69,
from .../src/gdb/defs.h:620,
from .../src/gdb/aarch64-tdep.c:21:
.../src/gdb/common/common-regcache.h:60:29: note: expected 'ULONGEST * {aka long unsigned int *}' but argument is of type 'uint64_t * {aka long long unsigned int *}'
extern enum register_status regcache_raw_read_unsigned
^
gdb/ChangeLog:
2016-04-20 Pedro Alves <palves@redhat.com>
* aarch64-tdep.c (aarch64_record_load_store): Change type of
'reg_rm_val' local to ULONGEST.
Fixes, with gcc 5.3.0:
.../src/gdb/darwin-nat.c: In function 'void darwin_resume_thread(inferior*, darwin_thread_t*, int, int)':
.../src/gdb/darwin-nat.c:731:21: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
(caddr_t)thread->gdb_port, nsignal);
^
.../src/gdb/darwin-nat.c:84:35: note: in definition of macro 'PTRACE'
darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG))
^
thread->gdb_port is an unsigned int, caddr_t is a void pointer.
gdb/ChangeLog:
2016-04-20 Pedro Alves <palves@redhat.com>
* darwin-nat.c (darwin_resume_thread): Add uintptr_t cast.
Fix the compilation failure by including arch/arm-linux.h in
aarch32-linux-nat.c.
gdb:
2016-04-20 Yao Qi <yao.qi@linaro.org>
* aarch32-linux-nat.c: Include "arch/arm-linux.h".
This patch moves macro ARM_CPSR_GREGNUM to arch/arm-linux.h so that it
can be used in GDBserver side.
gdb:
2016-04-20 Yao Qi <yao.qi@linaro.org>
* arm-linux-tdep.h (ARM_CPSR_GREGNUM): Move it to ...
* arch/arm-linux.h: ... here.
gdb/gdbserver:
2016-04-20 Yao Qi <yao.qi@linaro.org>
* linux-aarch32-low.c: Include "arch/arm-linux.h".
(arm_fill_gregset): Use ARM_CPSR_GREGNUM rather than magic
number 16.
(arm_store_gregset): Likewise.
FreeBSD versions older than 11.0 use char * as the type of ss_sp in
stack_t instead of the standards-defined void *. C++ allows a char *
pointer to be converted to a void *, so it is safe to cast the return
value of xmalloc to char * if ss_sp is either a char * or void *.
Just always use the cast to char * since that is less ugly than having
to add a special case.
gdb/ChangeLog:
* main.c (setup_alternate_signal_stack): Cast to char *.
In record_linux_system_call there are some cases with identical
handling. These are merged together to reduce code duplication.
gdb/ChangeLog:
* linux-record.c (record_linux_system_call): Merge handling for
readlink/recv/read and pipe/pipe2.
In the previous patch a new set of target descriptions
(i386|amd64)-avx-mpx were added being same as the (i386|amd64)-mpx.
This patch removes AVX feature from (i386|amd64)-mpx target
description set.
This way the (i386|amd64)avx_mpx(_linux|) set has AVX and MPX features
and (i386|amd64)mpx(_linux|) only MPX.
2016-04-14 Walfred Tedeschi <walfred.tedeschi@intel.com>
* features/i386/amd64-mpx-linux.xml: Remove AVX feature.
* features/i386/amd64-mpx.xml: Remove AVX feature.
* features/i386/i386-mpx-linux.xml: Remove AVX feature.
* features/i386/i386-mpx.xml: Remove AVX feature.
* features/i386/amd64-mpx-linux.c: Regenerate.
* features/i386/amd64-mpx.c: Regenerate.
* features/i386/i386-mpx-linux.c: Regenerate.
* features/i386/i386-mpx.c: Regenerate.
* regformats/i386/amd64-mpx-linux.dat: Regenerate.
* regformats/i386/amd64-mpx.dat: Regenerate.
* regformats/i386/i386-mpx-linux.dat: Regenerate.
* regformats/i386/i386-mpx.dat: Regenerate.
The current MPX target descriptions assume that MPX is always combined
with AVX, however that's not correct. We can have machines with MPX
and without AVX; or machines with AVX and without MPX.
This patch adds new target descriptions for machines that support
both MPX and AVX, as duplicates of the existing MPX descriptions.
The following commit will remove AVX from the MPX-only descriptions.
2016-04-16 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* amd64-linux-tdep.c (features/i386/amd64-avx-mpx-linux.c):
New include.
(amd64_linux_core_read_description): Add case for
X86_XSTATE_AVX_MPX_MASK.
(_initialize_amd64_linux_tdep): Call initialize_tdesc_amd64_avx_mpx_linux.
* amd64-linux-tdep.h (tdesc_amd64_avx_mpx_linux): New definition.
* amd64-tdep.c (features/i386/amd64-avx-mpx.c): New include.
(amd64_target_description): Add case for X86_XSTATE_AVX_MPX_MASK.
(_initialize_amd64_tdep): Call initialize_tdesc_amd64_avx_mpx.
* common/x86-xstate.h (X86_XSTATE_MPX_MASK): Remove AVX bits.
(X86_XSTATE_AVX_MPX_MASK): New case.
* features/Makefile (i386/i386-avx-mpx, i386/i386-avx-mpx-linux)
(i386/amd64-avx-mpx, i386/amd64-avx-mpx-linux): New rules.
(i386/i386-avx-mpx-expedite, i386/i386-avx-mpx-linux-expedite)
(i386/amd64-avx-mpx-expedite, i386/amd64-avx-mpx-linux-expedite):
New expedites.
* i386-linux-tdep.c (features/i386/i386-avx-mpx-linux.c): New
include.
(i386_linux_core_read_description): Add case
X86_XSTATE_AVX_MPX_MASK.
(_initialize_i386_linux_tdep): Call
initialize_tdesc_i386_avx_mpx_linux.
* i386-linux-tdep.h (tdesc_i386_avx_mpx_linux): New include.
* i386-tdep.c (features/i386/i386-avx-mpx.c): New include.
(i386_target_description): Add case for X86_XSTATE_AVX_MPX_MASK.
* x86-linux-nat.c (x86_linux_read_description): Add case for
X86_XSTATE_AVX_MPX_MASK.
* features/i386/amd64-avx-mpx-linux.xml: New file.
* features/i386/i386-avx-mpx-linux.xml: New file.
* features/i386/i386-avx-mpx.xml: New file.
* features/i386/amd64-avx-mpx.xml: New file.
* features/i386/amd64-avx-mpx-linux.c: Generated.
* features/i386/amd64-avx-mpx.c: Generated.
* features/i386/i386-avx-mpx-linux.c: Generated.
* features/i386/i386-avx-mpx.c: Generated.
* regformats/i386/amd64-avx-mpx-linux.dat: Generated.
* regformats/i386/amd64-avx-mpx.dat: Generated.
* regformats/i386/i386-avx-mpx-linux.dat: Generated.
* regformats/i386/i386-avx-mpx.dat: Generated.
gdb/gdbserver/ChangeLog:
* Makefile.in (clean): Add removal for i386-avx-mpx.c,
i386-avx-mpx-linux.c, amd64-avx-mpx.c and amd64-avx-mpx-linux.c.
(i386-avx-mpx.c, i386-avx-mpx-linux.c, amd64-avx-mpx.c)
(amd64-avx-mpx-linux.c): New rules.
(amd64-avx-mpx-linux-ipa.o, i386-avx-mpx-linux-ipa.o): New rule.
* configure.srv (srv_i386_regobj): Add i386-avx-mpx.o.
(srv_i386_linux_regobj): Add i386-avx-mpx-linux.o.
(srv_amd64_regobj): Add amd64-avx-mpx.o.
(srv_amd64_linux_regobj): Add amd64-avx-mpx-linux.o.
(srv_i386_xmlfiles): Add i386/i386-avx-mpx.xml.
(srv_amd64_xmlfiles): Add i386/amd64-avx-mpx.xml.
(srv_i386_linux_xmlfiles): Add i386/i386-avx-mpx-linux.xml.
(srv_amd64_linux_xmlfiles): Add i386/amd64-avx-mpx-linux.xml.
(ipa_i386_linux_regobj): Add i386-avx-mpx-linux-ipa.o.
(ipa_amd64_linux_regobj): Add amd64-avx-mpx-linux-ipa.o.
* linux-x86-low.c (x86_linux_read_description): Add case for
X86_XSTATE_AVX_MPX_MASK.
(x86_get_ipa_tdesc_idx): Add cases for avx_mpx.
(initialize_low_arch): Call init_registers_amd64_avx_mpx_linux and
init_registers_i386_avx_mpx_linux.
* linux-i386-ipa.c (get_ipa_tdesc): Add case for avx_mpx.
(initialize_low_tracepoint): Call
init_registers_i386_avx_mpx_linux.
* linux-amd64-ipa.c (get_ipa_tdesc): Add case for avx_mpx.
(initialize_low_tracepoint): Call
init_registers_amd64_avx_mpx_linux.
* linux-x86-tdesc.h (X86_TDESC_AVX_MPX): New enum value.
(init_registers_amd64_avx_mpx_linux, tdesc_amd64_avx_mpx_linux)
(init_registers_i386_avx_mpx_linux, tdesc_i386_avx_mpx_linux): New
declarations.
The ptrace args/return types detection doesn't work properly in C++
mode, on non-GNU/Linux hosts. For example, on gcc70 (NetBSD 5.1),
where the prototype is:
int ptrace(int, __pid_t, void*, int);
configure misdetects it as:
$ grep PTRACE_TYPE config.h
#define PTRACE_TYPE_ARG1 int
#define PTRACE_TYPE_ARG3 int *
#define PTRACE_TYPE_ARG4 int
/* #undef PTRACE_TYPE_ARG5 */
#define PTRACE_TYPE_RET int
resulting in:
../../src/gdb/amd64bsd-nat.c: In function 'void amd64bsd_fetch_inferior_registers(target_ops*, regcache*, int)':
../../src/gdb/amd64bsd-nat.c:56: warning: dereferencing type-punned pointer will break strict-aliasing rules
../../src/gdb/amd64bsd-nat.c: In function 'void amd64bsd_store_inferior_registers(target_ops*, regcache*, int)':
../../src/gdb/amd64bsd-nat.c:104: warning: dereferencing type-punned pointer will break strict-aliasing rules
../../src/gdb/amd64bsd-nat.c:110: warning: dereferencing type-punned pointer will break strict-aliasing rules
We could address this [1], however despite ptrace.m4's claim:
# Needs to be tested in C++ mode, to detect whether we need to cast
# the first argument to enum __ptrace_request.
it appears that there's actually no need to test in C++ mode. Always
running the ptrace tests in C mode works just the same on GNU/Linux.
I remember experimenting with several different ways to handle the
original issue back then, and maybe that was needed in some other
attempt and then I didn't realize it ended up not really necessary.
Confirmed that this fixes the NetBSD 5.1 C++ build, and confirmed that
C and C++ builds on Fedora 23 are unaffected.
[1] - https://sourceware.org/ml/gdb-patches/2016-04/msg00374.html
gdb/ChangeLog:
2016-04-18 Pedro Alves <palves@redhat.com>
* ptrace.m4 (GDB_AC_PTRACE): Don't run tests in C++ mode.
* configure: Regenerate.
gdb/gdbserver/ChangeLog:
2016-04-18 Pedro Alves <palves@redhat.com>
* configure: Regenerate.
After compiling a program which uses C++ references some optimizations may
convert the references into synthetic "pointers". Trying to print the address
of one of such synthetic references causes gdb to crash with the following
error:
(gdb) print &ref
/build/buildd/gdb-7.7.1/gdb/dwarf2loc.c:1624: internal-error: Should not be able to create a lazy value with an enclosing type
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Apparently, what was causing it was that value_addr returns a copy of the value
that represents the reference with its type set to T* instead of T&. However,
its enclosing_type is left untouched, which fails a check made in
read_pieced_value. We only see the crash happen for references that are
synthetic because they're treated as pieced values, thus the call to
read_pieced_value.
On a related note, it seems that in general there are all sorts of breakage
when working with synthetic references. This is reported here:
https://sourceware.org/bugzilla/show_bug.cgi?id=19893
gdb/ChangeLog:
2016-04-18 Martin Galvan <martin.galvan@tallertechnologies.com>
* valops.c (value_addr): For C++ references, set the copied value's
enclosing_type as well.
gdb/testsuite/ChangeLog:
2016-04-18 Martin Galvan <martin.galvan@tallertechnologies.com>
* gdb.dwarf2/implref.exp: New file.
2016-04-18 Yao Qi <yao.qi@linaro.org>
Revert:
2016-04-15 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (thumb_stack_frame_destroyed_p): Return zero if
PC is far from the end of function.
On:
$ uname -a
NetBSD gcc70.fsffrance.org 5.1 NetBSD 5.1 (GENERIC) #0: Sat Nov 6 13:19:33 UTC 2010 builds@b6.netbsd.org:/home/builds/ab/netbsd-5-1-RELEASE/amd64/201011061943Z-obj/home/builds/ab/netbsd-5-1-RELEASE/src/sys/arch/amd64/compile/GENERIC amd64
The link fails with:
(...)
d-exp.o: In function `parse_number':
../../src/gdb/d-exp.y:762: multiple definition of `yydefred'
ada-exp.o:/home/palves/gdb/build/gdb/ada-lex.c:925: first defined here
ld: Warning: size of symbol `yydefred' changed from 464 in ada-exp.o to 336 in d-exp.o
Makefile:1404: recipe for target 'gdb' failed
NetBSD's yacc uses a "yydefred" symbol that we missed renaming in the
Ada parser. All other gdb parsers do this already.
gdb/ChangeLog:
2016-04-16 Pedro Alves <palves@redhat.com>
* ada-exp.y (yydefred): Define as ada_yydefred.
Compiling gdb with --enable-build-with-cxx --disable-nls, we get:
.../src/gdb/ada-lang.c:7657:16: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
type_str = (type != NULL
^
In file included from .../src/gdb/common/common-defs.h:67:0,
from .../src/gdb/defs.h:28,
from .../src/gdb/ada-lang.c:21:
.../src/gdb/common/gdb_locale.h:40:27: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
# define _(String) (String)
^
.../src/gdb/ada-lang.c:7730:46: note: in expansion of macro ‘_’
char *name_str = name != NULL ? name : _("<null>");
^
Makefile:1140: recipe for target 'ada-lang.o' failed
gdb/ChangeLog:
2016-04-15 Pedro Alves <palves@redhat.com>
* ada-lang.c (ada_lookup_struct_elt_type): Constify 'type_str' and
'name_str' locals.
With libipt's headers installed, a build with --enable-build-with-cxx
fails with:
.../src/gdb/btrace.c: In function ‘btrace_insn_flag pt_btrace_insn_flags(const pt_insn*)’:
.../src/gdb/btrace.c:734:33: error: invalid conversion from ‘int’ to ‘btrace_insn_flag’ [-fpermissive]
enum btrace_insn_flag flags = 0;
^
.../src/gdb/btrace.c:737:11: error: invalid conversion from ‘int’ to ‘btrace_insn_flag’ [-fpermissive]
flags |= BTRACE_INSN_FLAG_SPECULATIVE;
^
gdb/ChangeLog:
2016-04-15 Pedro Alves <palves@redhat.com>
* btrace.c (pt_btrace_insn_flags): Change return type to
btrace_insn_flags. Use btrace_insn_flags for local.
This makes the MIPS Linux backends recognize TRAP_BRKPT and
TRAP_HWBKPT in siginfo.si_code in addition to SI_KERNEL, since Linux
4.6 now reports the finer-grained si_code values too.
Refs:
https://sourceware.org/ml/gdb-patches/2016-02/msg00756.htmlhttps://sourceware.org/ml/gdb-patches/2016-04/msg00090.html
On kernels that report SI_KERNEL (<= 4.5), we'll enter the "ambiguous"
path of save_stop_reason:
if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code)
&& GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code))
{
/* The si_code is ambiguous on this arch -- check debug
registers. */
if (!check_stopped_by_watchpoint (lp))
lp->stop_reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
}
while on kernels that report the finer-grained si_code values (>= 4.6),
we'll enter the corresponding branches:
else if (GDB_ARCH_IS_TRAP_BRKPT (siginfo.si_code))
{
}
else if (GDB_ARCH_IS_TRAP_HWBKPT (siginfo.si_code))
{
...
gdb/ChangeLog:
2016-04-15 Pedro Alves <palves@redhat.com>
* nat/linux-ptrace.h [__mips__] (GDB_ARCH_IS_TRAP_BRKPT): Also
accept TRAP_BRKPT.
[__mips__] (GDB_ARCH_IS_TRAP_HWBKPT): Also accept TRAP_HWBKPT.
thumb_stack_frame_destroyed_p scans the instructions from PC to the
end of the function, but if PC is far from the end of pc, we don't
have to scan, because PC should be in epilogue if it is still
far from the end of the function. The criterion I use here is 16
bytes, which is more than 4 instructions.
Regression tested on aarch64-linux with mutli-arch debug.
gdb:
2016-04-15 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (thumb_stack_frame_destroyed_p): Return zero if
PC is far from the end of function.
On:
$ uname -a
NetBSD gcc70.fsffrance.org 5.1 NetBSD 5.1 (GENERIC) #0: Sat Nov 6 13:19:33 UTC 2010 builds@b6.netbsd.org:/home/builds/ab/netbsd-5-1-RELEASE/amd64/201011061943Z-obj/home/builds/ab/netbsd-5-1-RELEASE/src/sys/arch/amd64/compile/GENERIC amd64
With:
$ g++ -v
Using built-in specs.
Target: x86_64--netbsd
Configured with: /usr/src/tools/gcc/../../gnu/dist/gcc4/configure --enable-long-long --disable-multilib --enable-threads --disable-symvers --build=x86_64-unknown-netbsd4.99.72 --host=x86_64--netbsd --target=x86_64--netbsd --enable-__cxa_atexit
Thread model: posix
gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)
I saw:
cc1plus: warnings being treated as errors
../../src/gdb/ctf.c: In function 'void ctf_save_metadata_header(trace_write_handler*)':
../../src/gdb/ctf.c:267: warning: format not a string literal, argument types not checked
cc1plus: warnings being treated as errors
../../src/gdb/cli/cli-cmds.c: In function 'void alias_command(char*, int)':
../../src/gdb/cli/cli-cmds.c:1428: warning: format not a string literal and no format arguments
../../src/gdb/cli/cli-cmds.c:1457: warning: format not a string literal and no format arguments
gdb/ChangeLog:
2016-04-14 Pedro Alves <palves@redhat.com>
* cli/cli-cmds.c (alias_usage_error): New function.
(alias_command): Use it.
* ctf.c (ctf_save_metadata_header): Inline metadata_fmt local in
ctf_save_write_metadata call.
On:
$ uname -a
NetBSD gcc70.fsffrance.org 5.1 NetBSD 5.1 (GENERIC) #0: Sat Nov 6 13:19:33 UTC 2010 builds@b6.netbsd.org:/home/builds/ab/netbsd-5-1-RELEASE/amd64/201011061943Z-obj/home/builds/ab/netbsd-5-1-RELEASE/src/sys/arch/amd64/compile/GENERIC amd64
With:
$ g++ -v
Using built-in specs.
Target: x86_64--netbsd
Configured with: /usr/src/tools/gcc/../../gnu/dist/gcc4/configure --enable-long-long --disable-multilib --enable-threads --disable-symvers --build=x86_64-unknown-netbsd4.99.72 --host=x86_64--netbsd --target=x86_64--netbsd --enable-__cxa_atexit
Thread model: posix
gcc version 4.1.3 20080704 prerelease (NetBSD nb2 20081120)
I saw:
../../src/gdb/ada-typeprint.c: In function 'void print_fixed_point_type(type*, ui_file*)':
../../src/gdb/ada-typeprint.c:366: warning: passing 'float' for argument 2 to 'DOUBLEST ada_fixed_to_float(type*, LONGEST)'
../../src/gdb/value.c: In function 'LONGEST unpack_long(type*, const gdb_byte*)':
../../src/gdb/value.c:2833: warning: converting to 'LONGEST' from 'DOUBLEST'
../../src/gdb/value.c:2838: warning: converting to 'LONGEST' from 'DOUBLEST'
gdb/ChangeLog:
2016-04-14 Pedro Alves <palves@redhat.com>
* ada-typeprint.c (print_fixed_point_type): Don't pass float as
argument to function expecting LONGEST.
* value.c (unpack_long): Add casts to LONGEST.
When we attempt to debug a process using GDBserver in standard remote mode
without a symbol file on GDB's end, we may run into an issue where GDB cuts
the connection attempt short due to an error. The error is caused by not
being able to open a symbol file, like so:
--
(gdb) set sysroot
(gdb) tar rem :2345
Remote debugging using :2345
/proc/23769/exe: Permission denied.
(gdb) i r
The program has no registers now.
(gdb)
It should've been like this:
(gdb) set sysroot
(gdb) tar rem :2345
Remote debugging using :2345
warning: /tmp/symbol-file: Permission denied.
0xf7ddb2d0 in ?? ()
(gdb) i r
eax 0x0 0
ecx 0x0 0
edx 0x0 0
ebx 0x0 0
esp 0xffffdfa0 0xffffdfa0
ebp 0x0 0x0
esi 0x0 0
edi 0x0 0
eip 0xf7ddb2d0 0xf7ddb2d0
eflags 0x200 [ IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
(gdb)
This is caused by a couple of function calls within exec_file_locate_attach
that can potentially throw errors.
The following patch guards both exec_file_attach and symbol_file_add_main to
prevent the errors from disrupting the connection process.
There was also a case where native GDB tripped on this problem, but it was
mostly fixed by bf74e428bc.
Regression-tested on x86-64/Ubuntu.
gdb/ChangeLog:
2016-04-13 Luis Machado <lgustavo@codesourcery.com>
* exec.c (exec_file_locate_attach): Guard a couple functions
that can throw errors.
(exception_print_same): New helper function.
Reverse debugging against a remote target that does reverse debugging
itself (with the bs/bc packets) always trips on:
(gdb) target remote localhost:...
(gdb) reverse-stepi
../../gdb/target.c:602: internal-error: default_execution_direction: to_execution_direction must be implemented for reverse async
I missed adding a to_execution_direction method to remote.c in commit
3223143295 (Adds target_execution_direction to make record targets
support async mode), GDB 7.4 time. Later, GDB 7.8 switched to
target-async on by default, making the regression user-visible by
default too.
Fix is simply to add the missing to_execution_direction implementation
to target remote.
Tested by Andi Kleen against Simics.
gdb/ChangeLog:
2016-04-13 Pedro Alves <palves@redhat.com>
PR remote/19840
* remote.c (struct remote_state) <last_resume_exec_dir>: New
field.
(new_remote_state): Default last_resume_exec_dir to EXEC_FORWARD.
(remote_open_1): Reset last_resume_exec_dir to EXEC_FORWARD.
(remote_resume): Store the last execution direction.
(remote_execution_direction): New function.
(init_remote_ops): Install it as to_execution_direction target_ops
method.
Now that we don't ever throw GDB exceptions from signal handlers [1],
we can switch back to having TRY/CATCH implemented in terms of C++
try/catch instead of sigjmp/longjmp.
[1] - https://sourceware.org/ml/gdb-patches/2016-03/msg00351.html
Tested on x86_64 Fedora 23, native and gdbserver.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* common/common-exceptions.h (GDB_XCPT_TRY): Update comment.
[__cplusplus] (GDB_XCPT): Define as GDB_XCPT_TRY.
Now that we don't ever throw GDB exceptions from signal handlers [1],
we can switch to have TRY/CATCH implemented in terms of plain
setjmp/longjmp instead of sigsetjmp/siglongjmp.
In https://sourceware.org/ml/gdb-patches/2015-02/msg00114.html, Yichun
Zhang mentions a 11%/14%+ speedup in his GDB python scripts with a
patch that did something similar to only a specific set of TRY/CATCH
calls.
[1] - https://sourceware.org/ml/gdb-patches/2016-03/msg00351.html
Tested on x86_64 Fedora 23, native and gdbserver.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (struct catcher) <buf>: Now a
'jmp_buf' instead of SIGJMP_BUF.
(exceptions_state_mc_init): Change return type to 'jmp_buf'.
(throw_exception): Use longjmp instead of SIGLONGJMP.
* common/common-exceptions.h: Include <setjmp.h> instead of
"gdb_setjmp.h".
(exceptions_state_mc_init): Change return type to 'jmp_buf'.
[GDB_XCPT == GDB_XCPT_SJMP] (TRY): Use setjmp instead of
SIGSETJMP.
* cp-support.c: Include "gdb_setjmp.h".
This finally gets rid of immediate_quit (and surrounding
infrustruture), as nothing sets it anymore.
gdb_call_async_signal_handler was only necessary in order to handle
immediate_quit. We can just call mark_async_signal_handler directly
on all hosts now.
In turn, we can clean up mingw-hdep.c's gdb_select a bit, as
sigint_event / sigint_handler is no longer needed.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* defs.h: Update comments on SIGINT handling.
(immediate_quit): Delete declaration.
* event-loop.c (call_async_signal_handler): Delete.
* event-loop.h (call_async_signal_handler): Delete declaration.
(mark_async_signal_handler): Update comments.
(gdb_call_async_signal_handler): Delete declaration.
* event-top.c (handle_sigint): Call mark_async_signal_handler
instead of gdb_call_async_signal_handler.
* exceptions.c (prepare_to_throw_exception): Remove reference to
immediate_quit.
(exception_fprintf): Remove comments about immediate_quit.
* mingw-hdep.c (sigint_event, sigint_handler): Delete.
(gdb_select): Don't wait on sigint_event.
(gdb_call_async_signal_handler): Delete.
(_initialize_mingw_hdep): Delete.
* posix-hdep.c (gdb_call_async_signal_handler): Delete.
* utils.c (immediate_quit): Delete.
remote.c is the last user of immediate_quit. It's relied on to
immediately break the initial remote connection sync up, if the user
does Ctrl-C, assuming that was because the target isn't responding.
At that stage, since the connection isn't synced yet, disconnecting is
the only safe thing to do. This commit reworks that, to not rely on
throwing from the SIGINT signal handler.
So, this commit:
- Introduces the concept of a "quit handler". This is used to
override what does the QUIT macro do when the quit flag is set.
- Makes the "struct serial" reachar / write code call QUIT in the
partial read/write loops, so the current quit handler is invoked
whenever a serial->read_prim / serial->write_prim returns EINTR.
- Makes the "struct serial" reachar / write code call
interruptible_select instead of gdb_select, so that QUITs are
detected in a race-free manner.
- Stops remote.c from setting immediate_quit during the initial
connection.
- Instead, we install a custom quit handler whenever we're calling
into the serial code. This custom quit handler knows to immediately
throw a quit when we're in the initial connection setup, and
otherwise defer handling the quit/Ctrl-C request to later, when
we're safely out of a packet command/response sequence. This also
is what is now responsible for handling "double Ctrl-C because
target connection is stuck/wedged."
- remote.c no longer installs a specialized SIGINT handlers, and
instead re-uses the quit flag. Since we want to rely on the QUIT
macro, the SIGINT handler must also set the quit. And the easiest
is just to not install custom SIGINT handler in remote.c. Let the
standard SIGINT handler do its job of setting the quit flag.
Centralizing SIGINT handlers seems like a good thing to me, anyway.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* defs.h (quit_handler_ftype, quit_handler)
(make_cleanup_override_quit_handler, default_quit_handler): New.
(QUIT): Adjust comments.
* event-top.c (default_quit_handler): New function.
(quit_handler): New global.
(struct quit_handler_cleanup_data): New.
(restore_quit_handler, restore_quit_handler_dtor)
(make_cleanup_override_quit_handler): New.
(async_request_quit): Call QUIT.
* remote.c (struct remote_state) <got_ctrlc_during_io>: New field.
(async_sigint_remote_twice_token, async_sigint_remote_token):
Delete.
(remote_close): Update comments.
(remote_start_remote): Don't set immediate_quit. Set starting_up
earlier.
(remote_serial_quit_handler, remote_unpush_and_throw): New
functions.
(remote_open_1): Clear got_ctrlc_during_io. Set
remote_async_terminal_ours_p unconditionally.
(async_initialize_sigint_signal_handler)
(async_handle_remote_sigint, async_handle_remote_sigint_twice)
(remote_check_pending_interrupt, async_remote_interrupt)
(async_remote_interrupt_twice)
(async_cleanup_sigint_signal_handler, ofunc)
(sync_remote_interrupt, sync_remote_interrupt_twice): Delete.
(remote_terminal_inferior, remote_terminal_ours): Remove async
checks.
(remote_wait_as): Don't install a SIGINT handler in sync mode.
(readchar, remote_serial_write): Override the quit handler with
remote_serial_quit_handler.
(getpkt_or_notif_sane_1): Don't call QUIT.
(initialize_remote_ops): Don't install
remote_check_pending_interrupt.
(_initialize_remote): Don't create async_sigint_remote_token and
async_sigint_remote_twice_token.
* ser-base.c (ser_base_wait_for): Call QUIT and use
interruptible_select.
(ser_base_write): Call QUIT.
* ser-go32.c (dos_readchar, dos_write): Call QUIT.
* ser-unix.c (wait_for): Don't use VTIME. Always take the
gdb_select path, but call QUIT and interruptible_select.
* utils.c (maybe_quit): Call the current quit handler. Don't call
target_check_pending_interrupt.
(defaulted_query, prompt_for_continue): Override the quit handler
with the default quit handler.
The MI code only does output, so leave raw/cooked mode alone, as well
as the SIGINT handler. Restore terminal settings after output, while
at it. Also, a couple events missed calling target_terminal_ours
before output, even.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* mi/mi-interp.c (mi_new_thread): Put
target_terminal_ours_for_output in effect while outputting.
(mi_thread_exit): Use target_terminal_ours_for_output instead of
target_terminal_ours.
(mi_record_changed, mi_inferior_added, mi_inferior_appeared)
(mi_inferior_exit, mi_inferior_removed, mi_traceframe_changed)
(mi_tsv_created, mi_tsv_deleted, mi_tsv_modified)
(mi_breakpoint_created, mi_breakpoint_deleted)
(mi_breakpoint_modified, mi_solib_loaded, mi_solib_unloaded)
(mi_command_param_changed, mi_memory_changed)
(report_initial_inferior): Use target_terminal_ours_for_output
instead of target_terminal_ours. Restore terminal settings.
* mi/mi-main.c (mi_execute_command): Use
target_terminal_ours_for_output instead of target_terminal_ours.
Restore terminal settings.
Any time a caller calls query & friends / prompt_for_continue without
ensuring that gdb owns the terminal for input is a bug. So do that in
defaulted_query / prompt_for_continue directly instead.
An example of a case where we currently miss calling
target_terminal_ours is internal_error. Ever since defaulted_query
was made to use gdb_readline_callback, there's no way to answer the
internal error query if the internal error happens while the target is
has the terminal:
(gdb) c
Continuing.
.../src/gdb/linux-nat.c:1676: internal-error: linux_nat_resume: Assertion `dummy_counter < 10' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) _
Entering 'y' or 'n' does not work, GDB does not respond.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
PR gdb/19828
* gnu-nat.c (inf_validate_task_sc): Don't call
target_terminal_ours / target_terminal_inferior around query.
* i386-tdep.c (i386_record_lea_modrm, i386_process_record): Don't
call target_terminal_ours / target_terminal_inferior around
yquery.
* linux-record.c (record_linux_system_call): Don't call
target_terminal_ours / target_terminal_inferior around yquery.
* nto-procfs.c (interrupt_query): Don't call target_terminal_ours
/ target_terminal_inferior around query.
* record-full.c (record_full_check_insn_num): Remove
'set_terminal' parameter. Don't call target_terminal_ours /
target_terminal_inferior around query.
(record_full_message, record_full_registers_change)
(record_full_xfer_partial): Adjust.
* remote.c (interrupt_query): Don't call target_terminal_ours /
target_terminal_inferior around query.
* utils.c (defaulted_query): Install cleanup to restore target
terminal. Put target_terminal_ours_for_output in effect while
defaulted producing, and target_terminal_ours in in effect while
handling input.
(prompt_for_continue): Install cleanup to restore target terminal.
Put target_terminal_ours in in effect while handling input.
Some of the error paths in these functions leak.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* utils.c (defaulted_query, prompt_for_continue): Free temporary
strings with cleanups, instead of xfree.
We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.
And restore terminal settings, while at it.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* utils.c (vwarning, internal_vproblem): Use
make_cleanup_restore_target_terminal and
target_terminal_ours_for_output.
We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.
No need to restore terminal settings, we'll set inferior modes on the
following resume.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* infcmd.c (post_create_inferior, prepare_one_step): Use
target_terminal_ours_for_output instead of target_terminal_ours.
We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.
Restore terminal settings after output, while at it.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* exceptions.c (print_flush): Use target_terminal_ours_for_output
instead of target_terminal_ours, and restore target terminal with
a cleanup.
We're only doing output here, so leave raw/cooked mode alone, as well
as the SIGINT handler.
Restore terminal settings after output, while at it.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* cp-support.c (gdb_demangle): Use target_terminal_ours_for_output
instead of target_terminal_ours, and restore target terminal with
a cleanup.
A couple wrong things here
- We should not use target_terminal_ours when all we want is output.
We should use target_terminal_ours_for_output instead, which
preserves raw/cooked terminal modes, and SIGINT forwarding.
- Most importantly, relying on stderr output immediately preceding
the error/exception print isn't correct. The exception could be
caught and handled, for example; MI frontends won't display the
stderr part in an error dialog box. Etc.
This commit introduces a type_as_string helper that allows building a
full error string including type info.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* ada-lang.c (type_as_string, type_as_string_and_cleanup): New
functions.
(ada_lookup_struct_elt_type): Use type_as_string_and_cleanup.
- If serial->write_prim returns EINTR, ser_bas_write returns it to the
caller. This just looks wrong to me -- part of the output may have
already been sent, and there's no way for the caller to know that,
and thus no way for a caller to handle a partial write correctly.
- While ser-unix.c:ser_unix_read_prim retries on EINTR,
ser-tcp.c:net_read_prim does not.
This commit moves EINTR handling to the ser_base_write and
ser_base_readchar level, so all serial backends (at least those that
use it) end up handling EINTR consistently.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* ser-base.c (fd_event): Retry read_prim on EINTR.
(do_ser_base_readchar): Retry read_prim on EINTR.
(ser_base_write): Retry write_prim on EINTR.
* ser-unix.c (ser_unix_read_prim): Don't retry on EINTR here.
(ser_unix_write_prim): Remove comment.
If the user presses Ctrl-C immediately before target_terminal_inferior
is called and the target is resumed, instead of after, the Ctrl-C ends
up pending in the quit flag until the target next stops.
remote.c has this bit to handle this:
if (!target_is_async_p ())
{
ofunc = signal (SIGINT, sync_remote_interrupt);
/* If the user hit C-c before this packet, or between packets,
pretend that it was hit right here. */
if (check_quit_flag ())
sync_remote_interrupt (SIGINT);
}
But that's only reachable if async is off, while async is on by
default nowadays. It's also obviously not reacheable on native
targets.
This patch generalizes that to all targets.
We can't remove that remote.c bit yet, until we get rid of the sync
SIGINT handler though. That'll be done later in the series.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* remote.c (remote_pass_ctrlc): New function.
(init_remote_ops): Install it.
* target.c (target_terminal_inferior): Pass pending Ctrl-C to the
target.
(target_pass_ctrlc, default_target_pass_ctrlc): New functions.
* target.h (struct target_ops) <to_pass_ctrlc>: New method.
(target_pass_ctrlc, default_target_pass_ctrlc): New declarations.
* target-delegates.c: Regenerate.
In non-stop mode, "interrupt" results in a "stop with no signal",
while in all-stop mode, it results in a remote interrupt request /
stop with SIGINT. This is currently implemented in both the Linux and
remote target backends. Move it to the core code instead, making
target_interrupt specifically always about "Interrupting as if with
Ctrl-C", just like it is documented.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* infcmd.c (interrupt_target_1): Call target_stop is in non-stop
mode.
* linux-nat.c (linux_nat_interrupt): Delete.
(linux_nat_add_target): Don't install linux_nat_interrupt.
* remote.c (remote_interrupt_ns): Change return type to void.
Throw error if interrupting the target is not supported.
(remote_interrupt): Don't call the remote_stop_ns/remote_stop_as.
This call seems pointless. For instance, a SIGINT handler is only
installed later on. And if wasn't, I can't see why we'd want to lose
a Ctrl-C request.
Getting rid of this allows getting rid of clear_quit_flag.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* main.c (captured_main): Don't clear the quit flag.
I think this is reminiscent of the time when a longjmp would always
jump to the top level. Nowaways code that throw exceptions other than
a quit, which may even be caught and handled without reaching the top
level. Certainly such exceptions shouldn't clear an interrupt
request...
(We also need to get rid of prepare_to_throw_exception in order to be
able to just do "throw ex;" in C++.)
One could argue that we should clear the quit flag when we throw a
quit from the SIGINT handler, when immediate_quit is in effect, to
handle a race, here:
immediate_quit++;
QUIT;
... that's the usual pattern code must use when enabling
immediate_quit. The QUIT is there to catch the case of Ctrl-C having
already been pressed before immediate_quit was enabled. However, this
can happen:
immediate_quit++;
<< Ctrl-C pressed here too.
QUIT;
And in that case, if the quit flag was already set, it'll stay set
even after throwing a quit from the SIGINT handler. The end result is
a double quit. But OTOH, the user did press Ctrl-C two times. Since
I'm getting rid of immediate_quit, I'm not bothering with this.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* exceptions.c (prepare_to_throw_exception): Don't clear the quit
flag.
This just looks totally wrong to me, for completetly discarding a
user-requested Ctrl-C. I can't think of why we'd want do this here.
Actually, I digged the history, and found out that this has been here
since at least 7b4ac7e1ed (gdb-2.4, the initial revision, 1988), at
a time were we had a top level setjmp/longjmp, long before that got
wrapped in throw_exception and friends, and this code was in an
explicit loop, with the quit_flag cleared on every iteration, before
executing a command...
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* event-top.c (command_handler): Don't call clear_quit_flag.
Obviously not necessary since check_quit_flag clears the flag as side
effect.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* remote-sim.c (gdb_os_poll_quit): Don't call clear_quit_flag.
* remote.c (remote_wait_as): Don't call clear_quit_flag.
Now that we have an abstract for wakeable events, use it instead of a
(heavier) serial pipe.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* python/python.c: Include "ser-event.h".
(gdbpy_event_fds): Delete.
(gdbpy_serial_event): New.
(gdbpy_run_events): Change prototype. Use serial_event_clear
instead of serial_readchar.
(gdbpy_post_event): Use serial_event_set instead of serial_write.
(gdbpy_initialize_events): Use make_serial_event instead of
serial_pipe.
We have places where we call a blocking gdb_select expecting that a
Ctrl-C will unblock it. However, if the Ctrl-C is pressed just before
gdb_select, the SIGINT handler runs before gdb_select, and thus
gdb_select won't return.
For example gdb_readline_no_editing:
QUIT;
/* Wait until at least one byte of data is available. Control-C
can interrupt gdb_select, but not fgetc. */
FD_ZERO (&readfds);
FD_SET (fd, &readfds);
if (gdb_select (fd + 1, &readfds, NULL, NULL, NULL) == -1)
and stdio_file_read:
/* For the benefit of Windows, call gdb_select before reading from
the file. Wait until at least one byte of data is available.
Control-C can interrupt gdb_select, but not read. */
{
fd_set readfds;
FD_ZERO (&readfds);
FD_SET (stdio->fd, &readfds);
if (gdb_select (stdio->fd + 1, &readfds, NULL, NULL, NULL) == -1)
return -1;
}
return read (stdio->fd, buf, length_buf);
This is a race classically fixed with either the self-pipe trick, or
by blocking SIGINT and then using pselect instead of select.
Blocking SIGINT most of the time would mean that check_quit_flag (and
thus QUIT) would need to do a syscall every time it is called, which
sounds best avoided, since QUIT is called in many loops. Thus we take
the self-pipe trick route (wrapped in a serial event).
Instead of having all places that need this manually add an extra file
descriptor to the set of gdb_select's watched file descriptors, we
introduce a wrapper, interruptible_select, that does that.
The Windows version of gdb_select actually does not suffer from this,
because mingw-hdep.c:gdb_call_async_signal_handler sets a Windows
event that gdb_select always waits on. So this patch can be seen as
generalization of that technique. We can't remove that extra event
from mingw-hdep.c until we get rid of immediate_quit though.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* defs.h: Extend QUIT-related comments to mention
interruptible_select.
(quit_serial_event_set, quit_serial_event_clear): Declare.
* event-top.c: Include "ser-event.h" and "gdb_select.h".
(quit_serial_event): New global.
(async_init_signals): Make quit_serial_event.
(quit_serial_event_set, quit_serial_event_clear)
(quit_serial_event_fd, interruptible_select): New functions.
* extension.c (set_quit_flag): Set the quit serial event.
(check_quit_flag): Clear the quit serial event.
* gdb_select.h (interruptible_select): New declaration.
* guile/scm-ports.c (ioscm_input_waiting): Use
interruptible_select instead of gdb_select.
* top.c (gdb_readline_no_editing): Likewise.
* ui-file.c (stdio_file_read): Likewise.
GDB's core signal handling suffers from a classical signal handler /
mainline code race:
int
gdb_do_one_event (void)
{
...
/* First let's see if there are any asynchronous signal handlers
that are ready. These would be the result of invoking any of the
signal handlers. */
if (invoke_async_signal_handlers ())
return 1;
...
/* Block waiting for a new event. (...). */
if (gdb_wait_for_event (1) < 0)
return -1;
...
}
If a signal is delivered while gdb is blocked in the poll/select
inside gdb_wait_for_event, then the select/poll breaks with EINTR,
we'll loop back around and call invoke_async_signal_handlers.
However, if the signal handler runs between
invoke_async_signal_handlers and gdb_wait_for_event,
gdb_wait_for_event will block, until the next unrelated event...
The fix is to a struct serial_event, and register it in the set of
files that select/poll in gdb_wait_for_event waits on. The signal
handlers that defer work to invoke_async_signal_handlers call
mark_async_signal_handler, which is adjusted to also set the new
serial event in addition to setting a flag, and is thus now is
garanteed to immediately unblock the next gdb_select/poll call, up
until invoke_async_signal_handlers is called and the event is cleared.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* event-loop.c: Include "ser-event.h".
(async_signal_handlers_serial_event): New global.
(async_signals_handler, initialize_async_signal_handlers): New
functions.
(mark_async_signal_handler): Set
async_signal_handlers_serial_event.
(invoke_async_signal_handlers): Clear
async_signal_handlers_serial_event.
* event-top.c (async_init_signals): Call
initialize_async_signal_handlers.
This patch adds a new "event" struct serial type, that is an
abstraction specifically for waking up blocking waits/selects,
implemented on top of a pipe on POSIX, and on top of a native Windows
event (CreateEvent, etc.) on Windows.
This will be used to plug signal handler / mainline code races.
For example, GDB can indefinitely delay handling a quit request if the
user presses Ctrl-C between the last QUIT call and the next (blocking)
gdb_select call in the event loop:
QUIT;
<<< press ctrl-c here and end up blocked in gdb_select
indefinitely.
gdb_select (...); // whoops, SIGINT was already handled, no EINTR.
A global alone (either the quit flag, or the "ready" flag of the async
signal handlers in the event loop) is not sufficient.
To plug races such as these on POSIX systems, we have to register some
waitable file descriptor in the set of files gdb_select waits on, and
write to it from the signal handler. This is classically a pipe, and
the pattern called the self-pipe trick. On Linux, it could be a more
efficient eventfd instead, but I'm sticking with a pipe for
simplifity, as we need it for portability anyway.
(Alternatively, we could use pselect/ppoll, and block signals until
the pselect. The latter is not a design I think GDB could use,
because we want the QUIT macro to be super cheap, as it is used in
loops. Plus, Windows.)
This is a "struct serial" because Windows's gdb_select relies on that.
Windows's gdb_select, our "select" replacement, knows how to wait on
all kinds of handles (regular files, pipes, sockets, console, etc.)
unlike the native Windows "select" function, which can only wait on
sockets. Each file descriptor for a "serial" type that is not
normally waitable with WaitForMultipleObjects must have a
corresponding struct serial instance. gdb_select then internally
looks up the struct serial instance that wraps each file descriptor,
and asks it for the corresponding Windows waitable handle.
We could use serial_pipe() to create a "struct serial"-wrapped pipe
that is usable everywhere, including Windows. That's what currently
python/python.c uses for cross-thread posting of events.
However, serial_write and serial_readchar are not designed to be
async-signal-safe on POSIX hosts. It's easier to bypass those when
setting/clearing the event source.
And writing and a serial pipe is a bit heavy weight on Windows.
gdb_select requires an extra thread to wait on the pipe and several
Windows events, when a single manual-reset Windows event, with no
extra thread is sufficient.
The intended usage is simply:
- Call make_serial_event to create a serial event object.
- From the signal handler call serial_event_set to set the event.
- From mainline code, have select/poll wait for serial_event_fd(), in
addition to whatever other files you're about to wait for.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* Makefile.in (SFILES): Add ser-event.c.
(HFILES_NO_SRCDIR): Add ser-event.h.
(COMMON_OBS): Add ser-event.o.
* ser-event.c, ser-event.h: New files.
* serial.c (new_serial): New function, factored out from
(serial_fdopen_ops): ... this.
(serial_open_ops_1): New function, factored out from
(serial_open): ... this.
(serial_open_ops): New function.
* serial.h (struct serial): Forware declare.
(serial_open_ops): New declaration.
Not used by anything.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* serial.c (serial_open, serial_fdopen_ops, do_serial_close):
Remove references to name.
* serial.h (struct serial) <name>: Delete.
This code installs a custom signal handler that throws a quit
exception if remote_fio_no_longjmp is not set.
AFAICS, the only real reason for this might have been to unblock the
ui_file_read call, in remote_fileio_func_read. But ever since:
2009-11-13 Daniel Jacobowitz <dan@codesourcery.com>
* ui-file.c (stdio_file_read): Call gdb_select before read.
at:
https://sourceware.org/ml/gdb-patches/2009-11/msg00321.html
that call is interruptible.
This is not only useful for switching to native C++ exceptions, but
AFAICS, also fixes a potential mess up of the remote protocol
connection, since there are target_read_memory calls done while
remote_fio_no_longjmp is clear. If the user presses ctrl-c while GDB
is sending or receiving a packet, we'll stop the communication
immediately, at a point where it isn't safe.
gdbserver doesn't support the File I/O remote protocol extension so I
can't test this.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* remote-fileio.c (sigint_fileio_token, remote_fio_no_longjmp):
Delete.
(async_remote_fileio_interrupt): Delete.
(remote_fileio_ctrl_c_signal_handler): Don't call the async signal
handler. Instead just always set the ctrl_c flag.
(remote_fileio_reply): Clear remote_fio_ctrl_c_flag before
re-enabling the SIGINT handler.
(remote_fileio_func_open, remote_fileio_func_close)
(remote_fileio_func_read, remote_fileio_func_write)
(remote_fileio_func_lseek, remote_fileio_func_rename)
(remote_fileio_func_unlink, remote_fileio_func_stat)
(remote_fileio_func_fstat, remote_fileio_func_gettimeofday)
(remote_fileio_func_isatty, remote_fileio_func_system)
(remote_fileio_request): Remove references to
remote_fio_no_longjmp.
(initialize_remote_fileio): Don't create an async signal handler.
immediate_quit used to be necessary back when prompt_for_continue used
blocking fread, but nowadays it uses gdb_readline_wrapper, which is
implemented in terms of a nested event loop, which already knows how
to react to SIGINT:
#0 throw_it (reason=RETURN_QUIT, error=GDB_NO_ERROR, fmt=0x9d6d7e "Quit", ap=0x7fffffffcb88)
at .../src/gdb/common/common-exceptions.c:324
#1 0x00000000007bab5d in throw_vquit (fmt=0x9d6d7e "Quit", ap=0x7fffffffcb88) at .../src/gdb/common/common-exceptions.c:366
#2 0x00000000007bac9f in throw_quit (fmt=0x9d6d7e "Quit") at .../src/gdb/common/common-exceptions.c:385
#3 0x0000000000773a2d in quit () at .../src/gdb/utils.c:1039
#4 0x000000000065d81b in async_request_quit (arg=0x0) at .../src/gdb/event-top.c:893
#5 0x000000000065c27b in invoke_async_signal_handlers () at .../src/gdb/event-loop.c:949
#6 0x000000000065aeef in gdb_do_one_event () at .../src/gdb/event-loop.c:280
#7 0x0000000000770838 in gdb_readline_wrapper (prompt=0x7fffffffcd40 "---Type <return> to continue, or q <return> to quit---")
at .../src/gdb/top.c:873
The need for the QUIT in stdin_event_handler is then exposed by the
gdb.base/double-prompt-target-event-error.exp test, which has:
# We're now stopped in a pagination query while handling a
# target event (printing where the program stopped). Quitting
# the pagination should result in only one prompt being
# output.
send_gdb "\003p 1\n"
Without that change we'd get:
Continuing.
---Type <return> to continue, or q <return> to quit---PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: continue to pagination
^CpQuit
(gdb) 1
Undefined command: "1". Try "help".
(gdb) PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: first prompt
ERROR: Undefined command "".
UNRESOLVED: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: no double prompt
Vs:
Continuing.
---Type <return> to continue, or q <return> to quit---PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: continue to pagination
^CQuit
(gdb) p 1
$1 = 1
(gdb) PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: first prompt
PASS: gdb.base/double-prompt-target-event-error.exp: ctrlc target event: continue: no double prompt
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* event-top.c (stdin_event_handler): Call QUIT;
(prompt_for_continue): Don't run with immediate_quit set.
As can be seen in the tui_redisplay_readline comment:
"The command could call prompt_for_continue and we must not restore
SingleKey so that the prompt and normal keymap are used."
immediate_quit is being used as proxy for "secondary prompt".
We have a better predicate nowadays, so use it.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* tui/tui-io.c (tui_redisplay_readline): Check
gdb_in_secondary_prompt_p instead of immediate_quit.
* tui/tui.c: Include top.h.
(tui_rl_startup_hook): Check gdb_in_secondary_prompt_p instead of
immediate_quit.
read_command_line is the only caller, and here we can assume we're
reading a regular file, not stdin.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* top.c (read_command_file): Inline command_loop here.
(command_loop): Delete.
AFAICS, immediate_quit was only needed here nowdays to be able to
interrupt gdb_readline_no_editing.
command_line_input can also take the gdb_readline_wrapper path, but
since that is built on top of the event loop (gdb_select / poll and
asynchronous signal handlers), it can be interrupted.
gdb/ChangeLog:
2016-04-12 Pedro Alves <palves@redhat.com>
* top.c: Include "gdb_select.h".
(gdb_readline_no_editing): Wait for input with gdb_select instead
of blocking in fgetc.
(command_line_input): Don't set immediate_quit.
I did a quick pass over value.c and value.h and made some of the accessor methods'
pass-by-reference parameters const-correct. Besides the obvious benefits, this is
required if we want to use them on values that are already declared as const
(such as the parameters to lval_funcs).
There's probably a lot more stuff that can be made const, here and elsewhere.
gdb/ChangeLog:
2016-04-08 Martin Galvan <martin.galvan@tallertechnologies.com>
* value.c (value_next): Make pass-by-reference parameters const-correct.
(value_parent): Likewise.
(value_enclosing_type): Likewise.
(value_lazy): Likewise.
(value_stack): Likewise.
(value_embedded_offset): Likewise.
(value_pointed_to_offset): Likewise.
(value_raw_address): Likewise.
(deprecated_value_modifiable): Likewise.
(value_free_to_mark): Likewise.
(value_release_to_mark): Likewise.
(internalvar_name): Likewise.
(readjust_indirect_value_type): Likewise.
(value_initialized): Likewise.
* value.h (value_next): Likewise.
(value_parent): Likewise.
(value_enclosing_type): Likewise.
(value_lazy): Likewise.
(value_stack): Likewise.
(value_embedded_offset): Likewise.
(value_pointed_to_offset): Likewise.
(value_raw_address): Likewise.
(deprecated_value_modifiable): Likewise.
(value_free_to_mark): Likewise.
(value_release_to_mark): Likewise.
(internalvar_name): Likewise.
(readjust_indirect_value_type): Likewise.
(value_initialized): Likewise.
Some test fails in gdb.reverse/break-reverse.exp on arm-linux lead me
seeing the following error message,
continue^M
Continuing.^M
Cannot remove breakpoints because program is no longer writable.^M
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Further execution is probably impossible.^M
^M
Breakpoint 3, bar () at /home/yao/SourceCode/gnu/gdb/git/gdb/testsuite/gdb.reverse/break-reverse.c:22^M
22 xyz = 2; /* break in bar */^M
(gdb) PASS: gdb.reverse/break-reverse.exp: continue to breakpoint: bar backward
this is caused by two entries in record_full_breakpoints, and their addr
is the same, but in_target_beneath is different.
during the record, we do continue,
Continuing.
infrun: clear_proceed_status_thread (Thread 13772.13772)
infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: step-over queue now empty
infrun: resuming [Thread 13772.13772] for step-over
infrun: skipping breakpoint: stepping past insn at: 0x8620
Sending packet: $Z0,85f4,4#1d...Packet received: OK <----
.....
Sending packet: $vCont;c#a8...infrun: target_wait (-1.0.0, status) =
infrun: -1.0.0 [process -1],
infrun: status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun: -1.0.0 [process -1],
infrun: status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: T05swbreak:;0b:9cf5ffbe;0d:9cf5ffbe;0f:f4850000;thread:p35cc.35cc;core:1;
Sending packet: $Z0,85f4,4#1d...Packet received: OK <-----
....
Sending packet: $z0,85f4,4#3d...Packet received: OK <-----
we can see breakpoint on 0x85f4 are inserted *twice*, but only removed
once. That is fine to remote target, because Z/z packets are
idempotent, but there is a leftover in record_full_breakpoints
in record-full target. The flow can be described as below,
record_full_breakpoints remote target
-----------------------------------------------------------------------
forward execution, continue, in_target_beneath 1 breakpoint inserted
insert breakpoints on 0x85f4 in_target_beneath 1
twice
program stops,
remove breakpoint on 0x85f4 in_target_beneath 1 breakpoint removed
reverse execution, continue, in_target_beneath 1 none is requested
insert breakpoints on 0x85f4, in_target_beneath 0
program stops,
remote breakpoint on 0x85f4, in_target_beneath 0 request to remove,
but GDBserver
doesn't know
now, the question is why breakoint on 0x85f4 is inserted twice? One
is the normal breakpoint, and the other is the single step breakpoint.
GDB inserts single step breakpoint to do single step. When program
stops at 0x85f4, both of them are set on 0x85f4, and GDB deletes
single step breakpoint, so in update_global_location_list, this
breakpoint location is no longer found, GDB call
force_breakpoint_reinsertion to mark it condition_updated, and insert
it again.
The reason force_breakpoint_reinsertion is called to update the
conditions in the target side, because the conditions may be
changed. My original fix is to not call force_breakpoint_reinsertion
if OLD_LOC->cond is NULL, but it is not correct if another location
on the same address has condition, GDB doesn't produce condition for
target side, but GDB should do.
Then, I change my mind back to make record-full handling breakpoint
idempotent, to align with remote target. Before insert a new entry
into record_full_breakpoints, look for existing one on the same
address first. I also add an assert on
"bp->in_target_beneath == in_target_beneath", to be safer.
gdb:
2016-04-07 Yao Qi <yao.qi@linaro.org>
* record-full.c (record_full_insert_breakpoint): Return
early if entry on the address is found in
record_full_breakpoints.
I notice that bp_tgt won't be fully initialized if to_insert_breakpoint
isn't called in record_full_insert_breakpoint, and bp_tgt->reqstd_address
is zero, so an entry is added to record_full_breakpoints, but its address
is zero, which is wrong. This patch is to call gdbarch_breakpoint_from_pc
in the else branch to set bp_tgt->reqstd_address and bp_tgt->placed_size.
gdb:
2016-04-07 Yao Qi <yao.qi@linaro.org>
* record-full.c (record_full_insert_breakpoint): Set
bp_tgt->reqstd_address and bp_tgt->placed_size.
This patch eliminates an error thrown when accessing the value of a
pointer to a structure where the pointer has been optimized out and
'set print object' is 'on'. The error shows up as the rather ugly
value of the pointer variable in Eclipse.
If 'set print object' is 'on', GDB tries to determine the actual
(derived) type of the object rather than the declared type, which
requires dereferencing the pointer, which in this cases throws an
error because the pointer has been optimized out.
The fix is to simply ignore the 'print object on' setting for
pointers or references to structures when they have been optimized
out. This means we just get the declared type instead of the actual
type, because in this case that's the best that we can do.
To implement the fix, value_optimized_out was modified so that it
no longer throws an error when it fails to fetch the specified
value. Instead, it just checks value->optimized_out. If we can't
definitively say that the value is optimized out, then we assume
it is not.
gdb/ChangeLog:
2016-04-06 Don Breazeal <donb@codesourcery.com>
* value.c (value_actual_type): Don't try to get rtti type
of the value if it has been optimized out.
(value_optimized_out): If a memory access error occurs,
just check vaue->optimized_out.
It broke the compatibility with gdbserver-7.6 due to:
warning: remote target does not support file transfer, attempting to access files from local filesystem.
gdb/ChangeLog
2016-04-06 Jan Kratochvil <jan.kratochvil@redhat.com>
Revert the previous commit adding unknown_v_replies_ok.
With current FSF GDB HEAD and old FSF gdbserver I expected I could do:
gdb -ex 'file target:/root/redhat/threadit' -ex 'target remote :1234'
(supplying that unsupported qXfer:exec-file:read by "file")
But that does not work because:
Sending packet: $vFile:setfs:0#bf...Packet received: OK
Packet vFile:setfs (hostio-setfs) is supported
...
Sending packet: $vFile:setfs:104#24...Packet received: OK
"target:/root/redhat/threadit": could not open as an executable file: Invalid argument
GDB documentation says:
The valid responses to Host I/O packets are:
An empty response indicates that this operation is not recognized.
This "empty response" vs. "OK" was a bug in gdbserver < 7.7. It was fixed by:
commit e7f0d979dd
Author: Yao Qi <yao@codesourcery.com>
Date: Tue Dec 10 21:59:20 2013 +0800
Fix a bug in matching notifications.
Message-ID: <1386684626-11415-1-git-send-email-yao@codesourcery.com>
https://sourceware.org/ml/gdb-patches/2013-12/msg00373.html
2013-12-10 Yao Qi <yao@codesourcery.com>
* notif.c (handle_notif_ack): Return 0 if no notification
matches.
with unpatched old FSF gdbserver and patched FSF GDB HEAD:
gdb -ex 'file target:/root/redhat/threadit' -ex 'target remote :1234'
Sending packet: $vFile:setfs:0#bf...Packet received: OK
Packet vFile:setfs (hostio-setfs) is NOT supported
...
(gdb) info sharedlibrary
From To Syms Read Shared Object Library
0x00007ffff7ddbae0 0x00007ffff7df627a Yes (*) target:/lib64/ld-linux-x86-64.so.2
0x00007ffff7bc48a0 0x00007ffff7bcf514 Yes (*) target:/lib64/libpthread.so.0
gdb/ChangeLog
2016-04-06 Jan Kratochvil <jan.kratochvil@redhat.com>
* remote.c (struct remote_state): New field unknown_v_replies_ok.
(packet_config_support): Read it.
(remote_start_remote): Set it.
currently:
$ gdbserver-7.9 :1234 true &
$ gdb -q -ex 'target remote :1234' # that -q is not relevant here
Remote debugging using :1234
warning: Could not load vsyscall page because no executable was specified
try using the "file" command first.
0x00007ffff7ddcc80 in ?? ()
(gdb) b main
No symbol table is loaded. Use the "file" command.
Make breakpoint pending on future shared library load? (y or [n]) _
Provide more suggestive message to use the "file" command.
gdb/ChangeLog
2016-04-06 Jan Kratochvil <jan.kratochvil@redhat.com>
Pedro Alves <palves@redhat.com>
* exec.c (exec_file_locate_attach): Print warning for unsupported
target_pid_to_exec_file.
* symfile-mem.c (add_vsyscall_page): Remove the "file" command
message part.
This patch adds support for TYPE_CODE_ENUM values to be supplied
as right-hand side operand of the BINOP_REPEAT (@) operator. The
following should now work:
enum {
sz = 17
};
int
main ()
{
int arr[sz + 1] = { 0 };
return 0; /* line 9 here */
}
(gdb) b 9
(gdb) r
(gdb) p arr@sz
$1 = {0 <repeats 17 times>}
(gdb)
A couple of tests is also included in this patch to demonstrate that it is
working as intended.
gdb/Changelog:
2016-04-01 Artemiy Volkov <artemiyv@acm.org>
PR gdb/19820
* eval.c (evaluate_subexp_standard): Allow TYPE_CODE_ENUM to be
the type of BINOP_REPEAT's second operand.
gdb/testsuite/Changelog:
2016-04-01 Artemiy Volkov <artemiyv@acm.org>
PR gdb/19820
* gdb.base/printcmds.exp: Add artificial arrays tests.
Ref: https://sourceware.org/ml/gdb/2016-03/msg00023.html
GDB currently fails to fetch the list of already-registered JIT
modules on attach.
Nothing is calling jit_inferior_init, which is what is responsible for
walking the JIT object list at init time.
Despite the misleading naming, jit_inferior_created_hook ->
jit_inferior_init is only called when the inferior execs.
This regressed with the fix for PR gdb/13431 (03bef283c2):
https://sourceware.org/ml/gdb-patches/2012-02/msg00023.html which
removed the inferior_created (jit_inferior_created_observer)
observer.
Adding an inferior_created observer back fixes the issue.
In turn, this exposes a bug in jit_breakpoint_re_set_internal as well,
which is returning the wrong result when we already have the
breakpoint at the right address.
gdb/ChangeLog:
2016-03-31 Yichao Yu <yyc1992@gmail.com>
PR gdb/19858
* jit.c (jit_breakpoint_re_set_internal): Return 0 if we already
got the breakpoint at the right address.
(jit_inferior_created): New function.
(_initialize_jit): Install jit_inferior_created as
inferior_created observer.
Signed-off-by: Pedro Alves <palves@redhat.com>
When gdb is started in MI mode, the output of gdb.execute
command is in MI-format in case when it is executed from python stop
handler while for all other cases the output is in console-format.
To assure consistent output format, this is fixed by using the console
format for all python gdb command executions.
PR python/19743
gdb/ChangeLog:
2016-03-31 Catalin Udma <catalin.udma@freescale.com>
PR python/19743
* python/python.c (execute_gdb_command): Use console uiout
when executing gdb command.
* utils.c (restore_ui_out_closure): New structure.
(do_restore_ui_out): New function.
(make_cleanup_restore_ui_out): Likewise.
* utils.h (make_cleanup_restore_ui_out): Declare.
gdb/testsuite/ChangeLog:
2016-03-31 Catalin Udma <catalin.udma@freescale.com>
PR python/19743
* gdb.python/py-mi-events-gdb.py: New file.
* gdb.python/py-mi-events.c: New file.
* gdb.python/py-mi-events.exp: New file.
Signed-off-by: Catalin Udma <catalin.udma@freescale.com>
This removes support for:
| target | source |
|-------------------+-----------------------|
| target m32rsdi | gdb/remote-m32r-sdi.c |
| target mips | gdb/remote-mips.c |
| target pmon | gdb/remote-mips.c |
| target ddb | gdb/remote-mips.c |
| target rockhopper | gdb/remote-mips.c |
| target lsi | gdb/remote-mips.c |
That is:
- Remote M32R debugging over SDI.
- Debugging boards using the MIPS remote debugging protocol
over a serial line, PMON, and a few variants.
These are the last non-"target remote" remote targets in the tree, if
you don't count "target sim".
Refs:
https://sourceware.org/ml/gdb/2016-03/msg00004.htmlhttps://sourceware.org/ml/gdb-patches/2016-03/msg00580.html
gdb/ChangeLog:
2016-03-31 Pedro Alves <palves@redhat.com>
* NEWS: Mention that support for "target m32rsdi", "target mips",
"target pmon", "target ddb", "target rockhopper", and "target lsi"
was removed.
* Makefile.in (ALL_TARGET_OBS): Remove remote-m32r-sdi.o and
remote-mips.o.
(ALLDEPFILES): Remove remote-m32r-sdi.c and remote-mips.c.
* configure.tgt: Remove all references to remote-m32r-sdi.o and
remote-mips.o.
* mips-tdep.c (deprecated_mips_set_processor_regs_hack): Delete
function.
* mips-tdep.h (deprecated_mips_set_processor_regs_hack): Delete
declaration.
* remote-m32r-sdi.c, remote-mips.c: Delete files.
* symfile.c (generic_load, generic_load): Remove comments.
gdb/doc/ChangeLog:
2016-03-31 Pedro Alves <palves@redhat.com>
* gdb.texinfo (M32R/SDI): Delete node.
(MIPS Embedded): Remove references to the MIPS remote debugging
protocol, PMON and variants, and the associated commands.
Variable 'func''s type is CORE_ADDR, so it should be compared with 0
rather than NULL. This causes a build error.
This patch fixes this.
gdb:
2016-03-30 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_epilogue_frame_this_id): Check 'func' against
0 rather than NULL.
Nowadays, GDB can't unwind successfully from epilogue on arm,
(gdb) bt
#0 0x76ff65a2 in shr1 () from /home/yao/Source/gnu/build/gdb/testsuite/gdb.reverse/shr1.sl
#1 0x0000869e in main () at /home/yao/Source/gnu/build/gdb/testsuite/../../../binutils-gdb/gdb/testsuite/gdb.reverse/solib-reverse.c:34
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) disassemble shr1
Dump of assembler code for function shr1:
....
0x76ff659a <+10>: adds r7, #12
0x76ff659c <+12>: mov sp, r7
0x76ff659e <+14>: ldr.w r7, [sp], #4
0x76ff65a2 <+18>: bx lr
End of assembler dump.
in this case, prologue unwinder is used. It analyzes the prologue and
get the offsets of saved registers to SP. However, in epilogue, the
SP has been restored, prologue unwinder gets the registers from the
wrong address, and even the frame id is wrong.
In reverse debugging, this case (program stops at the last instruction
of function) happens quite frequently due to the reverse execution.
There are many test fails due to missing epilogue unwinder.
This adds epilogue unwinder, but the frame cache is still get by
prologue unwinder except that SP is fixed up separately, because SP
is restored in epilogue.
This patch fixes many fails in solib-precsave.exp, and solib-reverse.exp.
gdb:
2016-03-30 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c: (arm_make_epilogue_frame_cache): New function.
(arm_epilogue_frame_this_id): New function.
(arm_epilogue_frame_prev_register): New function.
(arm_epilogue_frame_sniffer): New function.
(arm_epilogue_frame_unwind): New.
(arm_gdbarch_init): Append unwinder arm_epilogue_frame_unwind.
This patch is to refactor arm_stack_frame_destroyed_p, so that the code
can be used in both arm_stack_frame_destroyed_p and arm epilogue
unwinder I am going to add in the next patch. In fact, the code
is the same in two places, but checking whether it is thumb mode
is slightly different. arm_stack_frame_destroyed_p uses
arm_pc_is_thumb, and epilogue unwinder should use arm_frame_is_thumb.
gdb:
2016-03-30 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_stack_frame_destroyed_p): Rename it ...
(arm_stack_frame_destroyed_p_1): ... here. Don't call
arm_pc_is_thumb.
(arm_stack_frame_destroyed_p): Call
thumb_stack_frame_destroyed_p and
arm_stack_frame_destroyed_p_1.
gdb/ChangeLog:
* python/py-utils.c (host_string_to_python_string): New function.
* python/python-internal.h (host_string_to_python_string): Declare it.
* python/py-*.c (*): Update all calls to
PyString_Decode (str, strlen (str), host_charset (), NULL);
to use host_string_to_python_string instead.
On powerpc64, qSymbol query may require gdb to read a function
descriptor, sending a vFile packet to gdbserver. Thus, we need
to handle 'v' packet in look_up_one_symbol.
vFile replies may be quite long, and require reallocating own_buf.
Since handle_v_requests assumes the buffer is the static global own_buf
from server.c and reallocates it, we need to make own_buf global and
use it from look_up_one_symbol instead of using our own auto variable.
I've also done the same change in relocate_instruction, just in case.
On gdb side, in remote_check_symbols, rs->buf may be clobbered by vFile
handling, yet we need its contents for the reply (the symbol name is
stored there). Allocate a new buffer instead.
This broke fast tracepoints on powerpc64, due to errors in reading IPA
symbols.
gdb/ChangeLog:
* remote.c (remote_check_symbols): Allocate own buffer for reply.
gdbserver/ChangeLog:
* remote-utils.c (look_up_one_symbol): Remove own_buf, handle 'v'
packets.
(relocate_instruction): Remove own_buf.
* server.c (own_buf): Make global.
(handle_v_requests): Make global.
* server.h (own_buf): New declaration.
(handle_v_requests): New prototype.
When gdb is used on core dump and PC is not pointing to a readable
memory read_memory_integer call in the xtensa_frame_cache throws an
error, making register inspection/backtracing impossible in that thread.
Use safe_read_memory_integer instead.
2016-03-29 Max Filippov <jcmvbkbc@gmail.com>
gdb/
* xtensa-tdep.c (xtensa_frame_cache): Change op1 type to LONGEST.
Use safe_read_memory_integer instead of read_memory_integer.
I happen to see a quotation mark is missing the following test,
gdb_test "break $end_location" \
"Breakpoint $decimal at .* line $end_location\." \
set breakpoint at end of main"
so the test result is
PASS: gdb.reverse/break-reverse.exp: set
This patch is to add the missing quotation mark back, and the test
result becomes
PASS: gdb.reverse/break-reverse.exp: set breakpoint at end of main
gdb/testsuite:
2016-03-24 Yao Qi <yao.qi@linaro.org>
* gdb.reverse/break-reverse.exp: Add quotation mark in the
test message.
This comment is out of date. We've already done that. Patch is to remove
it.
gdb:
2016-03-23 Yao Qi <yao.qi@linaro.org>
* gdbarch.sh (software_single_step): Remove comments.
* gdbarch.h: Regenerated.
This patch is to support some ARM median instructions in process
record. With this patch applied, these fails are fixed:
-FAIL: gdb.reverse/break-precsave.exp: run to end of main
-FAIL: gdb.reverse/break-precsave.exp: go to end of main forward
-FAIL: gdb.reverse/break-precsave.exp: end of record log
-FAIL: gdb.reverse/break-reverse.exp: continue to breakpoint: end
-FAIL: gdb.reverse/break-reverse.exp: end of record log
-FAIL: gdb.reverse/until-precsave.exp: run to end of main
-FAIL: gdb.reverse/until-precsave.exp: advance to marker2
-FAIL: gdb.reverse/until-precsave.exp: until func, not called by current frame
-FAIL: gdb.reverse/until-precsave.exp: reverse-advance to marker2
-FAIL: gdb.reverse/until-precsave.exp: reverse-finish from marker2
-FAIL: gdb.reverse/until-precsave.exp: reverse-advance to final return of factorial
-FAIL: gdb.reverse/until-precsave.exp: reverse-until to entry of factorial
-FAIL: gdb.reverse/until-reverse.exp: advance to marker2
-FAIL: gdb.reverse/until-reverse.exp: until func, not called by current frame
-FAIL: gdb.reverse/until-reverse.exp: reverse-advance to marker2
-FAIL: gdb.reverse/until-reverse.exp: reverse-finish from marker2
-FAIL: gdb.reverse/until-reverse.exp: reverse-advance to final return of factorial
-FAIL: gdb.reverse/until-reverse.exp: reverse-until to entry of factorial
gdb:
2016-03-21 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_record_media): New.
(arm_record_ld_st_reg_offset): Call arm_record_media.
This patch is to canonicalize more syscalls on arm linux in process
record. In this patch, I also comment out some syscalls which isn't
handled by GDB now. With this patch applied, two fails are fixed.
-FAIL: gdb.reverse/fstatat-reverse.exp: continue to breakpoint: marker2
-FAIL: gdb.reverse/recvmsg-reverse.exp: continue to breakpoint: marker2
gdb:
2016-03-21 Yao Qi <yao.qi@linaro.org>
* arm-linux-tdep.c (arm_canonicalize_syscall): Canonicalize
more syscalls.
sparc_software_single_step is not used out of sparc-tdep.c, so this
patch makes it static.
gdb:
2016-03-18 Yao Qi <yao.qi@linaro.org>
* sparc-tdep.c (sparc_software_single_step): Make it static.
* sparc-tdep.h (sparc_software_single_step): Remove declaration.
I happen to see that 1 is returned in spu_software_single_step when
target_read_memory returns 1. It must be wrong. That patch changes
it to throwing an error. Note that I choose to throw error because I
find the code in the end of spu_software_single_step throws errors.
gdb:
2016-03-18 Yao Qi <yao.qi@linaro.org>
* spu-tdep.c (spu_software_single_step): Throw error when
target_read_memory fails.
currently
gdb -p <pid from a container>
will print:
warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable
It correctly states the problem but it does not say how to solve it.
Originally I wanted to suggest also the Docker "-p 1234:1234" parameter but
I see the containers are more general topic than just Docker (even LxC etc.).
According to Gary future GDBs should be able to work even without gdbserver.
But currently gdbserver is still required.
gdb/ChangeLog
2016-03-17 Jan Kratochvil <jan.kratochvil@redhat.com>
* linux-thread-db.c (check_pid_namespace_match): Extend the message.
This patch addresses a failure in
gdb.threads/forking-threads-plus-breakpoint.exp:
FAIL: gdb.threads/forking-threads-plus-breakpoint.exp: cond_bp_target=1:
detach_on_fork=on: inferior 1 exited (timeout)
Cause:
A fork event was reported to GDB before GDB knew about the parent
thread, followed immediately by a breakpoint event in a different
thread. The parent thread was subsequently added via
remote_notice_new_inferior in process_stop_reply, but when the thread
was added the thread_info.state was set to THREAD_STOPPED. The fork
event was then handled correctly, but when the fork parent was resumed
via a call to keep_going, the state was unchanged.
The breakpoint event was then handled, which caused all the
non-breakpoint threads to be stopped. When the breakpoint thread was
resumed, all the non-breakpoint threads were resumed via
infrun.c:restart_threads. Our old fork parent wasn't restarted,
because it still had thread_info.state set to THREAD_STOPPED.
Ultimately the program under debug hung waiting for a pthread_join
while the old fork parent was stopped forever by GDB.
Fix:
Since this is non-stop, then the bug is that the thread should have
been added in THREAD_RUNNING state. Consider that infrun may be
pulling target events out of the target_ops backend into its own event
queue, but, not process them immediately. E.g., infrun may be
stopping all threads temporarily for a step-over-breakpoint operation
for thread A (stop_all_threads). The waitstatus of all threads is
thus left pending in the thread structure (save_status), including the
fork event of thread B. Right at this point, if the user does "info
threads", that should show thread B (the fork parent) running, not
stopped, even if internally, gdb is holding it paused for a little
bit.
Thus if in non-stop mode, always add new threads in the external
user-visible THREAD_RUNNING state. Change remote_notice_new_inferior
to accept the internal executing state of the thread instead, with
EXECUTING set to 1 when we discover a thread that is running on the
target (such as through remote_update_thread_list), and 0 when the
thread is really paused (such as when we see a stop reply).
Tested on x86_64 Linux and Nios II Linux target with x86 Linux host.
gdb/ChangeLog:
2016-03-17 Pedro Alves <palves@redhat.com>
Don Breazeal <donb@codesourcery.com>
PR remote/19496
* infcmd.c (notice_new_inferior): Use the 'leave_running' argument
instead of checking the 'non_stop' global.
* remote.c (remote_add_thread): New parameter 'executing'. Use it
to set the new thread's executing state.
(remote_notice_new_inferior): Rename parameter 'running' to
'executing'. Always set the thread state to THREAD_RUNNING in
non-stop mode, and to THREAD_STOPPED in all-stop mode. Pass
EXECUTING to remote_add_thread and notice_new_inferior.
(remote_update_thread_list): Update to pass executing state, not
running state.
Represent new Linux syscalls for s390 and s390x in GDB's syscall info.
Add the syscalls from 355 (userfaultfd) up to 374 (mlock2) as well as
the previously reserved NUMA syscalls 268-270, 287, and 310.
gdb/ChangeLog:
* syscalls/s390-linux.xml: Add NUMA syscalls and new syscalls up
to 374.
* syscalls/s390x-linux.xml: Likewise.
The function record_linux_system_call() often records a memory area
whose address is contained in a register. So far this required two
function calls: one for fetching the register value, and another one for
recording the memory area. These two function calls are now merged into
a new local helper function, and all occurrences are adjusted. This
reduces the source code and makes it more readable.
gdb/ChangeLog:
* linux-record.c (record_mem_at_reg): New helper function.
(record_linux_system_call): Exploit new helper function where
applicable.
This patch added handling for some syscalls to linux-record.c:
https://sourceware.org/ml/gdb-patches/2015-10/msg00452.html
But for both `pipe' and `pipe2' the patch lacks a statement after an
`if', such that the following `break' is interpreted as the `if'-body
instead.
This adds the missing (return-) statements for the conditionals.
gdb/ChangeLog:
* linux-record.c (record_linux_system_call): Add missing return
statements to handling of pipe and pipe2 syscalls.
Arguments are passed in r0-r6 on arm linux syscall (both EABI and OABI).
This patch is to set arm_linux_record_tdep.arg{1-7} to the right
register number.
This patch fixes the following test failures...
-FAIL: gdb.reverse/getresuid-reverse.exp: check ruid record
-FAIL: gdb.reverse/getresuid-reverse.exp: check rgid record
-FAIL: gdb.reverse/pipe-reverse.exp: check pipe record
-FAIL: gdb.reverse/readv-reverse.exp: check readv record
-FAIL: gdb.reverse/readv-reverse.exp: check readv record
-FAIL: gdb.reverse/readv-reverse.exp: check readv record
-FAIL: gdb.reverse/readv-reverse.exp: check readv record
-FAIL: gdb.reverse/waitpid-reverse.exp: check waitpid record
gdb:
2016-03-16 Yao Qi <yao.qi@linaro.org>
* arm-linux-tdep.c (arm_linux_init_abi): Fix
arm_linux_record_tdep.arg1, arm_linux_record_tdep.arg2 and
arm_linux_record_tdep.arg3. Set arm_linux_record_tdep.arg4,
arm_linux_record_tdep.arg5, arm_linux_record_tdep.arg6, and
arm_linux_record_tdep.arg7.
lookup_symbol is often called with user input. Consequently, any
function called from lookup_symbol{,_in_language} should attempt to
deal with malformed input gracefully. After all, malformed user
input is not a programming/API error.
This patch does not attempt to find/correct all instances of this. It
only fixes locations in the code that trigger test suite failures.
This patch fixes PR breakpoints/18303, "Assertion: -breakpoint-insert
with windows paths of file in non-current directory".
The patch includes three new tests related to this. One is just
gdb.linespec/ls-errs.exp copied and converted to use C++ instead of C, and
to add a case using a file name containing a Windows-style logical drive
specifier. The others include an MI test to provide a regression test for
the specific case reported in PR 18303, and a C++ test for proper error
handling of access to a program variable when using a file scope specifier
that refers to a non-existent file.
Tested on x86_64 native Linux.
gdb/ChangeLog
2016-01-28 Keith Seitz <keiths@redhat.com>
PR breakpoints/18303
* cp-namespace.c (cp_lookup_bare_symbol): Change assertion to
look for "::" instead of simply ":".
(cp_search_static_and_baseclasses): Return null_block_symbol for
malformed input.
Remove assertions.
* cp-support.c (cp_find_first_component_aux): Do not return
a prefix length for ':' unless the next character is also ':'.
gdb/testsuite/ChangeLog
2016-01-28 Don Breazeal <donb@codesourcery.com>
* gdb.cp/scope-err.cc: New test program.
* gdb.cp/scope-err.exp: New test script.
* gdb.linespec/ls-errs.c (myfunction): Expanded to have multiple
lines and "set breakpoint here" comment.
* gdb.linespec/ls-errs.exp: Added C++ testing and new test case.
Fixed some whitespace and format issues.
* gdb.mi/mi-linespec-err-cp.cc: New test program.
* gdb.mi/mi-linespec-err-cp.exp: New test script.
If /proc is not mounted, GDB fails an assertion in find_new_threads_once:
Continuing.
.../src/gdb/linux-thread-db.c:1249: internal-error: find_new_threads_once: Assertion `!target_has_execution' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)
That was supposed to catch misuses of td_ta_thr_iter, which is unsafe
for live debugging. However, if /proc is not mounted, we still
fallback to using it.
I didn't bother with a warning, because GDB already prints several
others related to failing to open /proc files.
gdb/ChangeLog:
2016-03-15 Pedro Alves <palves@redhat.com>
PR gdb/19676
* linux-thread-db.c (try_thread_db_load_1): Leave
info->td_ta_thr_iter_p NULL iff debugging a live process and we
have /proc access.
(find_new_threads_once): Assert that we have a non-NULL
info->td_ta_thr_iter_p instead of checking whether the target has
execution.
On GNU/Linux archs that support displaced stepping, if /proc is not
mounted, GDB gets stuck not able to step past breakpoints:
(gdb) c
Continuing.
dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
2163 LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
Cannot find AT_ENTRY auxiliary vector entry.
(gdb) c
Continuing.
dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:2163
2163 LIBC_PROBE (init_complete, 2, LM_ID_BASE, r);
Cannot find AT_ENTRY auxiliary vector entry.
(gdb)
That's because GDB can't figure out where the scratch pad is.
This is a regression introduced by the earlier changes to make the
Linux native target always work in non-stop mode.
This commit makes GDB detect the case and fallback to stepping over
breakpoints in-line.
gdb/ChangeLog:
2016-03-15 Pedro Alves <palves@redhat.com>
PR gdb/19676
* infrun.c (displaced_step_prepare): Also disable displaced
stepping on NOT_SUPPORTED_ERROR.
* linux-tdep.c (linux_displaced_step_location): If reading auxv
fails, throw NOT_SUPPORTED_ERROR instead of generic error.
Add a new command 'maint info line-table' to display the contents of
GDB's internal line table structure. Useful when trying to understand
problems (within gdb) relating to line tables.
gdb/ChangeLog:
* symmisc.c (maintenance_info_line_tables): New function.
(maintenance_print_one_line_table): New function.
(_initialize_symmisc): Register 'maint info line-table' command.
* NEWS: Mention new command.
gdb/doc/ChangeLog:
* gdb.texinfo (Symbols): Document new 'maint info line-table'
command.
gdb/testsuite/ChangeLog:
* gdb.base/maint.exp: New tests for 'maint info line-table'.
gdb/ChangeLog:
* s390-linux-tdep.c (s390_ax_pseudo_register_collect): New function.
(s390_ax_pseudo_register_push_stack): New function.
(s390_gdbarch_init): Fill ax_pseudo_register_collect and
ax_pseudo_register_push_stack hooks.
This patch is a follow-up to "Add printf format specifier for printing
enumerator":
https://sourceware.org/ml/gdb-patches/2016-02/msg00144.html
Instead of having a solution specific to the printf command, Pedro
suggested adding a general purpose function $_as_string() that would
cover this use case and more.
So, in order to print the textual label of an enum, one can use:
(gdb) printf "Visiting node of type %s\n", $_as_string(node)
Visiting node of type NODE_INTEGER
gdb/ChangeLog:
* data-directory/Makefile.in (PYTHON_FILE_LIST): Install
gdb/function/as_string.py.
* python/lib/gdb/function/as_string.py: New file.
* NEWS: Mention the new $_as_string function.
gdb/testsuite/ChangeLog:
* gdb.python/py-as-string.exp: New file.
* gdb.python/py-as-string.c: New file.
gdb/doc/ChangeLog:
* gdb.texinfo (Convenience Functions): Document $_as_string.
I didn't manage to usefully split this further into smaller
independent pieces, so:
- Use "struct buffer" more.
- Split out the responsibility of composing a complete command line
from multiple input lines split with backslash
(
E.g.:
(gdb) print \
1 + \
2
$1 = 3
(gdb)
)
to a separate function. Note we don't need the separate
readline_input_state and more_to_come globals at all. They were
just obfuscating the logic.
- Factor out the tricky mostly duplicated code in
command_line_handler and command_line_input.
gdb/ChangeLog
2016-03-09 Pedro Alves <palves@redhat.com>
* event-top.c (more_to_come): Delete.
(struct readline_input_state): Delete.
(readline_input_state): Delete.
(get_command_line_buffer): New function.
(command_handler): Update comments. Don't handle NULL commands
here. Do not execute commented lines.
(command_line_append_input_line): New function.
(handle_line_of_input): New function, partly based on
command_line_handler and command_line_input.
(command_line_handler): Rewrite.
* event-top.h (command_handler): New declaration.
(command_loop): Defer command execution to command_handler.
(command_line_input): Update comments. Simplify, using struct
buffer and handle_line_of_input.
* top.h (struct buffer): New forward declaration.
(handle_line_of_input): New declaration.
There doesn't seem to be much point in trying to reuse this buffer.
Prefer simplicity instead.
(In case you're wondering whether this fixes an off-by-one: linelength
is misnamed; it's really a size including terminating null char.)
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* event-top.c (command_line_handler): Use xfree + xstrdup instead
of xrealloc + strcpy.
* main.c (captured_main): Use xstrdup instead of xmalloc plus
manual clear.
* top.c (saved_command_line): Rewrite comment.
(saved_command_line_size): Delete.
(command_line_input): Use xfree + xstrdup instead of xrealloc +
strcpy.
* top.h (saved_command_line_size): Delete declaration.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* event-top.c: Include buffer.h.
(gdb_readline_no_editing_callback): Use struct buffer instead
of xrealloc.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* common/buffer.h (buffer_grow_char): New function.
* top.c: Include buffer.h.
(gdb_readline_no_editing): Rename 'prompt_arg' parameter to
'prompt'. Use struct buffer instead of xrealloc.
Name this such that it's clearer that this is not a wrapper for the
real readline, but instead a replacement that provides no command line
editing features.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* defs.h (gdb_readline): Delete declaration.
* top.c (gdb_readline): Rename to ...
(gdb_readline_no_editing): ... this, and make static.
These comments are out of date -- we no longer call gdb_readline. And
I think that mentioning the event loop is more useful here than
whatever GO32 issue had with gdb_readline, which may even no longer be
an issue.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* utils.c (prompt_for_continue): Update comments.
The comments and existence of this global are a bit of misleading
obfuscation, since this is only ever used to print the prompt
annotation, and never changes. Just hardcode "prompt" where
necessary, as done for most other annotations.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* event-top.c (async_annotation_suffix): Delete.
(top_level_prompt, command_line_handler): Don't use
'async_annotation_suffix' and simplify.
* event-top.h (async_annotation_suffix): Delete declaration.
(init_main): Remove reference to 'async_annotation_suffix'.
I checked, and Insight doesn't set this.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* top.c (window_hook): Delete.
(command_loop): Remove references to window_hook.
I happened to break this locally and the testsuite didn't notice it.
Add some tests.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* gdb.base/command-line-input.exp: New file.
Previously, backchain was read as a signed quantity, resulting in
addresses like 0xfffffffffffeded0 instead of 0xfffeded0 returned by
unwinder on 32-bit powerpc. While normally such addresses are masked
off, this causes problems for tracepoints, since 0xfffffffffffeded0
is considered unavailable.
Fixes a test failure in gdb.trace/entry-values.exp.
gdb/ChangeLog:
* corefile.c (safe_read_memory_unsigned_integer): New function.
* gdbcore.h (safe_read_memory_unsigned_integer): New prototype.
* rs6000-tdep.c (rs6000_frame_cache): Read backchain as unsigned.
gdb/ChangeLog:
* rs6000-tdep.c: Add "ax.h" and "ax-gdb.h" includes.
(rs6000_gen_return_address): New function.
(rs6000_gdbarch_init): Wire in the above.
Functions compiled with the gcc option `-mhotpatch' may start with a
branch-never BRCL instruction as a 6-byte NOP. And functions compiled
with `-mstack-size' contain a BRC instruction in their prologue that is
actually a conditional trap. Both of these special jumps cause the
prologue parser to stop and yield bad unwinding results.
This change makes the prologue analyzer recognize such special jumps and
ignore them.
gdb/ChangeLog:
* s390-linux-tdep.c (s390_analyze_prologue): Ignore BRC and BRCL
instructions that do nothing or are conditional traps.
When determining the frame ID of an inline frame, GDB currently asserts
that a valid ID of the underlying real frame is found, and that it does
not match outer_frame_id. From inline_frame_this_id():
/* For now, require we don't match outer_frame_id either (see
comment above). */
gdb_assert (!frame_id_eq (*this_id, outer_frame_id));
However, this assertion may fail when the real frame's unwinder can not
determine the frame ID. This happened on an s390x target with a binary
that lacked call frame information and also confused the prologue
analyzer, because then s390_frame_this_id() left the frame ID at its
default.
To fix this, this change enhances s390_frame_this_id such that an
unavailable-stack frame ID is built if no frame base can be determined
but the function address is available.
gdb/ChangeLog:
* s390-linux-tdep.c (s390_prologue_frame_unwind_cache): Store
frame func's PC in info->func before any other failure can occur.
(s390_frame_this_id): Use frame_id_build_unavailable_stack if
info->func has been filled out.
It's not possible today to select some of the osabis by name.
Specifically, those that have spaces in their names and then the first
word is ambiguous...
For example:
(gdb) set osabi <TAB>
[...]
FreeBSD ELF
FreeBSD a.out
[...]
(gdb) set osabi FreeBSD ELF
Ambiguous item "FreeBSD ELF".
In reality, because "set osabi" is an enum command, that was
equivalent to trying "set osabi FreeBSD", which is then obviously
ambiguous, because of "FreeBSD ELF" and "FreeBSD a.out".
Also, even if the first word is not ambiguous, we actually ignore
whatever comes after the first word:
(gdb) set osabi GNU/Linux
(gdb) show osabi
The current OS ABI is "GNU/Linux".
The default OS ABI is "GNU/Linux".
(gdb) set osabi Windows SomeNonsense
^^^^^^^^^^^^
(gdb) show osabi
The current OS ABI is "Windows CE".
The default OS ABI is "GNU/Linux".
(gdb)
Fix this by avoiding spaces in osabi names.
We could instead make "set osabi" have a custom set hook, or
alternatively make the enum set hook (in cli-setshow.c) handle values
with spaces, but OTOH, I have a feeling that could cause trouble.
E.g., in cases where we might want to write more than one enum value
in the same line. We could support quoting as workaround, but, not
sure we want that. "No spaces" seems like a simpler rule.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* osabi.c (gdb_osabi_names): Avoid spaces in osabi names.
Even though "set architecture" presents fr300 as option:
(gdb) set architecture fr<TAB>
fr300 fr400 fr450 fr500 fr550 frv
Actually selecting fr300 doesn't work:
(gdb) set architecture fr300
Architecture `fr300' not recognized.
The target architecture is set automatically (currently i386)
(gdb)
This just looks like an obvious oversight. Looking around gcc and
binutils sources, FR300 is basically a FR500 specialized for DSP and
low power.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* frv-tdep.c (frv_gdbarch_init): Handle bfd_mach_fr300.
This fixes:
$ ./gdb -q -ex "set endian big" -ex "set architecture cris"
The target is assumed to be big endian
.../src/gdb/cris-tdep.c:4051: internal-error: cris_gdbarch_init: big endian byte order in info
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)
The "set cris-version" command can likewise cause internal errors.
The gdbarch init routine should be returning 0 to reject the
architecture instead of internal erroring on user input.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* cris-tdep.c (cris_gdbarch_init): Return 0 if the info's byte
order is BFD_ENDIAN_BIG or if the cris version is unsupported.
Running the testsuite with a gdb configured with --enable-libmcheck
reveals a problem:
(gdb) ptype 3 * 2.0
type = <12-byte float>
memory clobbered past end of allocated block
ERROR: Process no longer exists
UNRESOLVED: gdb.ada/ptype_arith_binop.exp: ptype 3 * 2.0
(gdb) PASS: gdb.dlang/expression.exp: ptype 0x1.FFFFFFFFFFFFFp1023
ptype 0x1p-52L
type = real
memory clobbered past end of allocated block
ERROR: Process no longer exists
UNRESOLVED: gdb.dlang/expression.exp: ptype 0x1p-52L
Even though this shows up with Ada and D, it's easy to reproduce in C
too. We just need to print a long double, when the current arch is
32-bit, which is the default when gdb starts up:
$ ./gdb -q -ex "ptype 1.0L"
type = long double
memory clobbered past end of allocated block
Aborted (core dumped)
Valgrind shows:
==22159== Invalid write of size 8
==22159== at 0x8464A9: floatformat_from_doublest (doublest.c:756)
==22159== by 0x846822: store_typed_floating (doublest.c:867)
==22159== by 0x6A7959: value_from_double (value.c:3662)
==22159== by 0x6A9F2D: evaluate_subexp_standard (eval.c:745)
==22159== by 0x7F31AF: evaluate_subexp_c (c-lang.c:716)
==22159== by 0x6A8986: evaluate_subexp (eval.c:79)
==22159== by 0x6A8BA3: evaluate_type (eval.c:174)
==22159== by 0x817CCF: whatis_exp (typeprint.c:456)
==22159== by 0x817EAA: ptype_command (typeprint.c:508)
==22159== by 0x5F267B: do_cfunc (cli-decode.c:105)
==22159== by 0x5F5618: cmd_func (cli-decode.c:1885)
==22159== by 0x83622A: execute_command (top.c:475)
==22159== Address 0x8c6cb28 is 8 bytes inside a block of size 12 alloc'd
==22159== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==22159== by 0x87384A: xcalloc (common-utils.c:83)
==22159== by 0x873889: xzalloc (common-utils.c:93)
==22159== by 0x6A34CB: allocate_value_contents (value.c:1036)
==22159== by 0x6A3501: allocate_value (value.c:1047)
==22159== by 0x6A790A: value_from_double (value.c:3656)
==22159== by 0x6A9F2D: evaluate_subexp_standard (eval.c:745)
==22159== by 0x7F31AF: evaluate_subexp_c (c-lang.c:716)
==22159== by 0x6A8986: evaluate_subexp (eval.c:79)
==22159== by 0x6A8BA3: evaluate_type (eval.c:174)
==22159== by 0x817CCF: whatis_exp (typeprint.c:456)
==22159== by 0x817EAA: ptype_command (typeprint.c:508)
==22159==
type = long double
(gdb)
Even if the target and host floating-point formats match, the length
of the types might still be different. On x86, long double is the
80-bit extended precision type on both 32-bit and 64-bit ABIs, but by
default it is stored as 12 bytes on 32-bit, and 16 bytes on 64-bit,
for alignment reasons. Several places in doublest.c already consider
this, but floatformat_to_doublest and floatformat_from_doublest miss
it. E.g., convert_typed_floating and store_typed_floating,
Tested on x86-64 Fedora 23 with --enable-libmcheck, where it fixes the
crashed above.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* doublest.c: Extend comments.
(floatformat_to_doublest, floatformat_from_doublest): Copy the
floatformat's total size, not the host type's size.
This would have caught the HP/PA bug fixed in the previous patch:
.../src/gdb/gdbtypes.c:4690: internal-error: arch_float_type: Assertion `len >= floatformat_totalsize_bytes (floatformats[0])' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)
Tested on x86-64 Fedora 23, --enable-targets=all.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* doublest.c (floatformat_totalsize_bytes): New function.
(floatformat_from_type): Assert that the type's length is at least
as long as the floatformat's totalsize.
* doublest.h (floatformat_totalsize_bytes): New declaration.
* gdbtypes.c (arch_float_type): Assert that the type's length is
at least as long as the floatformat's totalsize.
This:
$ ./gdb -ex "set architecture hppa1.0" -ex "set osabi GNU/Linux" -ex "ptype 1.0L"
Shows that HPPA/Linux support for long doubles is broken. It causes
GDB to access memory out of bounds. With Valgrind, we see:
The target architecture is assumed to be hppa1.0
==4371== Invalid write of size 8
==4371== at 0x4C2F21F: memset (vg_replace_strmem.c:1224)
==4371== by 0x8451C4: convert_doublest_to_floatformat (doublest.c:362)
==4371== by 0x845F86: floatformat_from_doublest (doublest.c:769)
==4371== by 0x84628E: store_typed_floating (doublest.c:873)
==4371== by 0x6A7C3D: value_from_double (value.c:3662)
==4371== by 0x6AA211: evaluate_subexp_standard (eval.c:745)
==4371== by 0x7F306D: evaluate_subexp_c (c-lang.c:716)
==4371== by 0x6A8C6A: evaluate_subexp (eval.c:79)
==4371== by 0x6A8E87: evaluate_type (eval.c:174)
==4371== by 0x817B8D: whatis_exp (typeprint.c:456)
==4371== by 0x817D68: ptype_command (typeprint.c:508)
==4371== by 0x5F2977: do_cfunc (cli-decode.c:105)
==4371== Address 0x8998d18 is 0 bytes after a block of size 8 alloc'd
==4371== at 0x4C2AA98: calloc (vg_replace_malloc.c:711)
==4371== by 0x8732B6: xcalloc (common-utils.c:83)
==4371== by 0x8732F5: xzalloc (common-utils.c:93)
==4371== by 0x6A37AF: allocate_value_contents (value.c:1036)
==4371== by 0x6A37E5: allocate_value (value.c:1047)
==4371== by 0x6A7BEE: value_from_double (value.c:3656)
==4371== by 0x6AA211: evaluate_subexp_standard (eval.c:745)
==4371== by 0x7F306D: evaluate_subexp_c (c-lang.c:716)
==4371== by 0x6A8C6A: evaluate_subexp (eval.c:79)
==4371== by 0x6A8E87: evaluate_type (eval.c:174)
==4371== by 0x817B8D: whatis_exp (typeprint.c:456)
==4371== by 0x817D68: ptype_command (typeprint.c:508)
The trouble is that hppa_linux_init_abi overrides the default
long_double_bit set by the generic hppa-tdep.c:
set_gdbarch_long_double_bit (gdbarch, 128);
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
with:
/* On hppa-linux, currently, sizeof(long double) == 8. There has been
some discussions to support 128-bit long double, but it requires some
more work in gcc and glibc first. */
set_gdbarch_long_double_bit (gdbarch, 64);
which misses overriding the long_double_format, so we end with a weird
combination of:
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
Weird because floatformats_ia64_quad's totalsize is longer than 64-bits.
The floatformat conversion routines use the struct floatformat's
totalsize (in bits) to know how much to copy/convert, thus the buffer
overruns.
gdb/ChangeLog:
2016-03-09 Pedro Alves <palves@redhat.com>
* hppa-linux-tdep.c (hppa_linux_init_abi): Set the long double
format to floatformats_ieee_double.
Fix this GDB crash:
$ gdb -ex "set architecture mips:10000"
Segmentation fault (core dumped)
Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000495b1b in mips_gdbarch_init (info=..., arches=0x0) at /home/pedro/gdb/mygit/cxx-convertion/src/gdb/mips-tdep.c:8436
8436 if (bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
(top-gdb) bt
#0 0x0000000000495b1b in mips_gdbarch_init (info=..., arches=0x0) at .../src/gdb/mips-tdep.c:8436
#1 0x00000000007348a6 in gdbarch_find_by_info (info=...) at .../src/gdb/gdbarch.c:5155
#2 0x000000000073563c in gdbarch_update_p (info=...) at .../src/gdb/arch-utils.c:522
#3 0x0000000000735585 in set_architecture (ignore_args=0x0, from_tty=1, c=0x26bc870) at .../src/gdb/arch-utils.c:496
#4 0x00000000005f29fd in do_sfunc (c=0x26bc870, args=0x0, from_tty=1) at .../src/gdb/cli/cli-decode.c:121
#5 0x00000000005fd3f3 in do_set_command (arg=0x7fffffffdcdd "mips:10000", from_tty=1, c=0x26bc870) at .../src/gdb/cli/cli-setshow.c:455
#6 0x0000000000836157 in execute_command (p=0x7fffffffdcdd "mips:10000", from_tty=1) at .../src/gdb/top.c:460
#7 0x000000000071abfb in catch_command_errors (command=0x835f6b <execute_command>, arg=0x7fffffffdccc "set architecture mips:10000", from_tty=1)
at .../src/gdb/main.c:368
#8 0x000000000071bf4f in captured_main (data=0x7fffffffd750) at .../src/gdb/main.c:1132
#9 0x0000000000716737 in catch_errors (func=0x71af44 <captured_main>, func_args=0x7fffffffd750, errstring=0x106b9a1 "", mask=RETURN_MASK_ALL)
at .../src/gdb/exceptions.c:240
#10 0x000000000071bfe6 in gdb_main (args=0x7fffffffd750) at .../src/gdb/main.c:1164
#11 0x000000000040a6ad in main (argc=4, argv=0x7fffffffd858) at .../src/gdb/gdb.c:32
(top-gdb)
We already check whether info.abfd is NULL before all other
bfd_get_flavour calls in the same function. Just this one case was
missing.
(This was exposed by a WIP test that tries all "set architecture ARCH"
values.)
gdb/ChangeLog:
2016-03-07 Pedro Alves <palves@redhat.com>
* mips-tdep.c (mips_gdbarch_init): Check whether info.abfd is NULL
before calling bfd_get_flavour.
When calling function with argument of size more than 8 bytes fails with
an error "That operation is not available on integers of more than 8 bytes.".
avr-gdb considers only 8 bytes (sizeof(long long)) in case of passing the
argument in registers. When the argument is of size more than 8 byte
then the utility function to extract bytes failed with the above error.
gdb/
* avr-tdep.c (AVR_LAST_ARG_REGNUM): Define.
(avr_push_dummy_call): Correct last needed argument register.
Write MSB of argument into register and subsequent bytes into
other registers in decreasing order.
ARM process record gets the wrong register number for VMOV (from core
register to single-precision register). That is, we should record
the D register rather than the S pseudo register. The patch also
removes the condition "bit (arm_insn_r->arm_insn, 20)" check, which
has been checked above.
It fixes the following internal error,
(gdb) PASS: gdb.reverse/finish-precsave.exp: BP at end of main
continue^M
Continuing.^M
../../binutils-gdb/gdb/regcache.c:649: internal-error: regcache_raw_read: Assertion `regnum >= 0 && regnum < regcache->descr->nr_raw_registers' failed.^M
A problem internal to GDB has been detected,FAIL: gdb.reverse/finish-precsave.exp: run to end of main (GDB internal error)
gdb:
2016-03-04 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_record_vdata_transfer_insn): Simplify the
condition check. Record the right D register number.
This patch removes the printing "Process record does not support",
and do the print by calling arm_record_unsupported_insn in the
caller. Also, call arm_record_extension_space only when condition
is 0xf.
gdb:
2016-03-04 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_record_extension_space): Remove code
printing "Process record does not support".
(arm_record_data_proc_misc_ld_str): Likewise.
(decode_insn): Call arm_record_extension_space if condition
is 0xf. Call arm_record_unsupported_insn if ret isn't
ARM_RECORD_SUCCESS. Use 'ret' instead of 'insn_id' to hold
the value of thumb2_record_decode_insn_handler.
I found that odd that passing no arguments to feature_to_c.sh produces
this:
$ ./feature_to_c.sh
./feature_to_c.sh: 23: shift: can't shift that many
but passing one argument shows the help:
$ ./feature_to_c.sh hello
Usage: ./feature_to_c.sh OUTPUTFILE INPUTFILE...
This patch changes the script to show the help in both cases.
gdb/ChangeLog:
* features/feature_to_c.sh: Print the help when passing no
argument.
Add new maintainer to Write After Approval.
2016-03-02 Bernhard Heckel <bernhard.heckel@intel.com>
* MAINTAINERS (Write After Approval): Add Bernhard Heckel.
This fixes a GDB internal error that may occur when the inferior has no
valid stack pointer in r15.
gdb/testsuite/ChangeLog:
* gdb.arch/s390-stackless.S: New.
* gdb.arch/s390-stackless.exp: New.
gdb/ChangeLog:
* s390-linux-tdep.c (s390_backchain_frame_unwind_cache): Avoid
exception when attempting to access the inferior's backchain.
The last patch supports several syscalls in linux-record.c, so now
GDB aarch64-linux backend can return these canonicalized syscall numbers
per aarch64 syscall number.
This patch fixes the following fails,
Process record and replay target doesn't support syscall number 59^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00000020000eab28 in pipe () from /lib/aarch64-linux-gnu/libc.so.6^M
(gdb) FAIL: gdb.reverse/pipe-reverse.exp: continue to breakpoint: marker2
Process record and replay target doesn't support syscall number 59^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00000020000eab28 in pipe () from /lib/aarch64-linux-gnu/libc.so.6^M
(gdb) FAIL: gdb.reverse/readv-reverse.exp: continue to breakpoint: marker2
gdb:
2016-02-29 Yao Qi <yao.qi@linaro.org>
* aarch64-linux-tdep.c (aarch64_canonicalize_syscall): Support
eventfd2, eventfd2, dup3, inotify_init1, fallocate and pipe2.
Return gdb_sys_epoll_create1 instead of gdb_sys_epoll_create
for aarch64_sys_epoll_create1.
Given two or more modules that import each other's scope, the current symbol
lookup routines would go round in circles looking through each import from
each module, possibly checking the same module twice or more until all possible
paths are marked as "searched".
Given enough modules, this causes an exponential slowdown in time taken to find
symbols that do exist, and infinite recursion when they don't.
gdb/ChangeLog:
* d-namespace.c (d_lookup_symbol_imports): Avoid recursive lookups from
cyclic imports.
gdb/testsuite/ChangeLog:
* gdb.dlang/circular.c: New file.
* gdb.dlang/circular.exp: New file.
This is an obvious patch to fix the following build error seen with
--enable-build-with-cxx:
../../src/gdb/rs6000-tdep.c: In function ‘rs6000_frame_cache* rs6000_frame_cache(frame_info*, void**)’:
../../src/gdb/rs6000-tdep.c:3242:15: error: invalid conversion from ‘void*’ to ‘rs6000_frame_cache*’ [-fpermissive]
return (*this_cache);
~^~~~~~~~~~~~
gdb/ChangeLog
* rs6000-tdep.c (rs6000_frame_cache): Explicitly cast return result
to avoid invalid conversion from void *.
This patch fixes various bugs in arm_record_exreg_ld_st_insn, and use
gdb.reverse/insn-reverse.c to test more arm instructions.
- Set flag SINGLE_REG correctly. In the arch reference manual,
SING_REG is true when the bit 8 of instruction is zero.
- Record the right D registers for instructions changing S registers.
- Fix the order of length and address in record_buf_mem array.
- Shift the offset by 2 instead of by 24.
This patch also fixes one internal error,
(gdb) PASS: gdb.reverse/finish-precsave.exp: BP at end of main
continue^M
Continuing.^M
../../binutils-gdb/gdb/utils.c:1072: internal-error: virtual memory exhausted.^M
A problem internal to GDB has been detected,FAIL: gdb.reverse/finish-precsave.exp: run to end of main (GDB internal error)
gdb:
2016-02-26 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (arm_record_exreg_ld_st_insn): Set 'single_reg'
per bit 8. Check bit 20 instead of bit 4 for VMOV
instruction. Record D registers for instructions changing
S registers. Change of the order of length and address
in record_buf_mem array.
gdb/testsuite:
2016-02-26 Yao Qi <yao.qi@linaro.org>
* gdb.reverse/insn-reverse.c [__arm__] (ext_reg_load): New.
[__arm__] (ext_reg_mov, ext_reg_push_pop): New.
(testcases): Update.
When GDB decodes these thumb special data instructions, such as 'mov sp, r7'
the Rd is got incorrectly. According to the arch reference manual, the Rd
is DN:Rdn, in which DN is bit 7 and Rdn is bits 0 to 2. This patch fixes it.
gdb:
2016-02-26 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c (thumb_record_ld_st_reg_offset): Fix the register
number of Rd.
We see this error when building with gcc 4.3.
../../gdb/i386-linux-tdep.c: In function ‘i386_linux_handle_segmentation_fault’:
../../gdb/i386-linux-tdep.c:399: error: ‘access’ may be used uninitialized in this function
../../gdb/i386-linux-tdep.c:399: error: ‘upper_bound’ may be used uninitialized in this function
../../gdb/i386-linux-tdep.c:399: error: ‘lower_bound’ may be used uninitialized in this function
It's a false positive, since the variables will always get initialized
in the TRY clause, and the CATCH returns.
gdb/ChangeLog:
* i386-linux-tdep.c (i386_linux_handle_segmentation_fault):
Initialize variables.
When encoding the agent expression operation ax_reg or ax_reg_mask, the
register number used is internal to GDB. However GDBServer expects a tdesc
based number.
This usually does not cause a problem since at the moment, for raw
registers GDBServer R trace action ignores the register mask and just
collects all registers.
It can be a problem, however with pseudo registers on some platforms if the
tdesc number doesn't match the GDB internal register number.
This is the case with ARM, the upcoming ARM tracepoint support, fails
these test cases without this patch:
gdb.trace/collection.exp: collect register locals collectively:*
GDBSever would exit with: unhandled register size
Since the register number is not mapped.
This patch fixes these issues by calling gdbarch_remote_register_number
before encoding the register number in the ax_reg or ax_reg_mask operation.
Tested on x86 native-gdbserver no regressions observed.
gdb/ChangeLog:
* ax-general.c (ax_reg): Call gdbarch_remote_register_number.
(ax_reg_mask): Likewise.
This unbreaks pending/delayed breakpoints handling, as well as
hardware watchpoints, on MIPS.
Ref: https://sourceware.org/ml/gdb-patches/2016-02/msg00681.html
The MIPS kernel reports SI_KERNEL for all kernel generated traps,
instead of TRAP_BRKPT / TRAP_HWBKPT, but GDB isn't aware of this.
Basically, this commit:
- Folds watchpoints logic into check_stopped_by_breakpoint, and
renames it to save_stop_reason.
- Adds GDB_ARCH_IS_TRAP_HWBKPT.
- Makes MIPS set both GDB_ARCH_IS_TRAP_BRPT and
GDB_ARCH_IS_TRAP_HWBKPT to SI_KERNEL. In save_stop_reason, we
handle the case of the same si_code returning true for both
TRAP_BRPT and TRAP_HWBKPT by looking at what the debug registers
say.
Tested on x86-64 Fedora 20, native and gdbserver.
gdb/ChangeLog:
2016-02-24 Pedro Alves <palves@redhat.com>
* linux-nat.c (save_sigtrap) Delete.
(stop_wait_callback): Call save_stop_reason instead of
save_sigtrap.
(check_stopped_by_breakpoint): Rename to ...
(save_stop_reason): ... this. Bits of save_sigtrap folded here.
Use GDB_ARCH_IS_TRAP_HWBKPT and handle ambiguous
GDB_ARCH_IS_TRAP_BRKPT / GDB_ARCH_IS_TRAP_HWBKPT. Factor out
common code between the USE_SIGTRAP_SIGINFO and
!USE_SIGTRAP_SIGINFO blocks.
(linux_nat_filter_event): Call save_stop_reason instead of
save_sigtrap.
* nat/linux-ptrace.h: Check for both SI_KERNEL and TRAP_BRKPT
si_code for MIPS.
* nat/linux-ptrace.h: Fix "TRAP_HWBPT" typo in x86 table. Add
comments on MIPS behavior.
(GDB_ARCH_IS_TRAP_HWBKPT): Define for all archs.
gdb/gdbserver/ChangeLog:
2016-02-24 Pedro Alves <palves@redhat.com>
* linux-low.c (check_stopped_by_breakpoint): Rename to ...
(save_stop_reason): ... this. Use GDB_ARCH_IS_TRAP_HWBKPT and
handle ambiguous GDB_ARCH_IS_TRAP_BRKPT / GDB_ARCH_IS_TRAP_HWBKPT.
Factor out common code between the USE_SIGTRAP_SIGINFO and
!USE_SIGTRAP_SIGINFO blocks.
(linux_low_filter_event): Call save_stop_reason instead of
check_stopped_by_breakpoint and check_stopped_by_watchpoint.
Update comments.
(linux_wait_1): Update comments.
This commit fixes an error in exec_file_locate_attach where
the main executable could be loaded from outside the sysroot
if a nonempty, non-"target:" sysroot was set but the discovered
executable filename did not exist in that sysroot and did exist
on the main filesystem.
gdb/ChangeLog:
* exec.c (exec_file_locate_attach): Do not attempt to
locate main executable locally if not found in sysroot.
gdb/testsuite/ChangeLog:
* gdb.base/attach-pie-noexec.exp: Do not expect an error
message on attach.
gdb/ChangeLog:
Extend "skip" command to support -file, -gfile, -function, -rfunction.
* NEWS: Document new features.
* skip.c: #include "fnmatch.h", "gdb_regex.h".
(skiplist_entry) <file>: Renamed from filename.
<function>: Renamed from function_name.
<file_is_glob, function_is_regexp>: New members.
<compiled_function_regexp, compiled_function_regexp_is_valid>:
New members.
(make_skip_entry): New function.
(free_skiplist_entry, free_skiplist_entry_cleanup): New functions.
(make_free_skiplist_entry_cleanup): New function.
(skip_file_command): Update.
(skip_function, skip_function_command): Update.
(compile_skip_regexp): New functions.
(skip_command): Add support for new options.
(skip_info): Update.
(skip_file_p, skip_gfile_p): New functions.
(skip_function_p, skip_rfunction_p): New functions.
(function_name_is_marked_for_skip): Update and simplify.
(_initialize_step_skip): Update.
* symtab.c: #include "fnmatch.h".
(compare_glob_filenames_for_search): New function.
* symtab.h (compare_glob_filenames_for_search): Declare.
* utils.c (count_path_elements): New function.
(strip_leading_path_elements): New function.
* utils.h (count_path_elements): Declare.
(strip_leading_path_elements): Declare.
gdb/doc/ChangeLog:
* gdb.texinfo (Skipping Over Functions and Files): Document new
options to "skip" command. Update docs of output of "info skip".
gdb/testsuite/ChangeLog:
* gdb.base/skip.c (test_skip): New function.
(end_test_skip_file_and_function): New function.
(test_skip_file_and_function): New function.
* gdb.base/skip1.c (test_skip): New function.
(skip1_test_skip_file_and_function): New function.
* gdb.base/skip.exp: Add tests for new skip options.
* gdb.base/skip-solib.exp: Update expected output.
* gdb.perf/skip-command.cc: New file.
* gdb.perf/skip-command.exp: New file.
* gdb.perf/skip-command.py: New file.
This patch updates the syscalls in sync with syscalls/aarch64-linux.xml.
Some syscalls are still not supported by gdb/linux-record.c yet. Mark
them UNSUPPORTED_SYSCALL_MAP.
This patch fixes the following test fail,
Process record and replay target doesn't support syscall number 56^M
Process record: failed to record execution log.^M
^M
Program stopped.^M
0x00000020000e9dfc in open () from /lib/aarch64-linux-gnu/libc.so.6^M
(gdb) FAIL: gdb.reverse/fstatat-reverse.exp: continue to breakpoint: marker2
gdb:
2016-02-23 Yao Qi <yao.qi@linaro.org>
* aarch64-linux-tdep.c (enum aarch64_syscall) <aarch64_sys_mknod>:
Remove.
<aarch64_sys_mkdir, aarch64_sys_unlink, aarch64_sys_symlink>: Remove.
<aarch64_sys_link, aarch64_sys_rename, aarch64_sys_faccess>: Remove.
<aarch64_sys_mknodat, aarch64_sys_mkdirat>: New.
<aarch64_sys_unlinkat, aarch64_sys_symlinkat>: New.
<aarch64_sys_linkat, aarch64_sys_renameat, aarch64_sys_faccessat>: New.
<aarch64_sys_open, aarch64_sys_readlink, aarch64_sys_fstatat>: Remove.
<aarch64_sys_openat, aarch64_sys_readlinkat>: New.
<aarch64_sys_newfstatat>: New.
(UNSUPPORTED_SYSCALL_MAP): New macro.
(aarch64_canonicalize_syscall): Add missing syscalls.
After building GDB
--with-python=/usr/bin/python3
and for example stripping ./gdb and running:
./gdb -data-directory data-directory/ -iex "add-auto-load-safe-path $PWD/gdb-gdb.gdb" -iex "add-auto-load-safe-path $PWD/gdb-gdb.
py" ./gdb
I get:
Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal]
File "/home/jkratoch/redhat/gdb-test-python3/gdb/gdb-gdb.py", line 91
print "Warning: Cannot find enum type_flag_value type."
^
SyntaxError: Missing parentheses in call to 'print'
(top-gdb) q
gdb/ChangeLog
2016-02-22 Jan Kratochvil <jan.kratochvil@redhat.com>
* gdb-gdb.py (class TypeFlagsPrinter): Use parentheses for print.
This patch fixes the various code format issues in arm process record
in arm-tdep.c, such as using tab instead of spaces.
gdb:
2016-02-22 Yao Qi <yao.qi@linaro.org>
* arm-tdep.c: Fix code format issues.
With Intel Memory Protection Extensions it was introduced the concept of
boundary violation. A boundary violations is presented to the inferior as
a segmentation fault having SIGCODE 3. This patch adds a
handler for a boundary violation extending the information displayed
when a bound violation is presented to the inferior. In the stop mode
case the debugger will also display the kind of violation: "upper" or
"lower", bounds and the address accessed.
On no stop mode the information will still remain unchanged. Additional
information about bound violations are not meaningful in that case user
does not know the line in which violation occurred as well.
When the segmentation fault handler is stop mode the out puts will be
changed as exemplified below.
The usual output of a segfault is:
Program received signal SIGSEGV, Segmentation fault
0x0000000000400d7c in upper (p=0x603010, a=0x603030, b=0x603050,
c=0x603070, d=0x603090, len=7) at i386-mpx-sigsegv.c:68
68 value = *(p + len);
In case it is a bound violation it will be presented as:
Program received signal SIGSEGV, Segmentation fault
Upper bound violation while accessing address 0x7fffffffc3b3
Bounds: [lower = 0x7fffffffc390, upper = 0x7fffffffc3a3]
0x0000000000400d7c in upper (p=0x603010, a=0x603030, b=0x603050,
c=0x603070, d=0x603090, len=7) at i386-mpx-sigsegv.c:68
68 value = *(p + len);
In mi mode the output of a segfault is:
*stopped,reason="signal-received",signal-name="SIGSEGV",
signal-meaning="Segmentation fault", frame={addr="0x0000000000400d7c",
func="upper",args=[{name="p", value="0x603010"},{name="a",value="0x603030"}
,{name="b",value="0x603050"}, {name="c",value="0x603070"},
{name="d",value="0x603090"},{name="len",value="7"}],
file="i386-mpx-sigsegv.c",fullname="i386-mpx-sigsegv.c",line="68"},
thread-id="1",stopped-threads="all",core="6"
in the case of a bound violation:
*stopped,reason="signal-received",signal-name="SIGSEGV",
signal-meaning="Segmentation fault",
sigcode-meaning="Upper bound violation",
lower-bound="0x603010",upper-bound="0x603023",bound-access="0x60302f",
frame={addr="0x0000000000400d7c",func="upper",args=[{name="p",
value="0x603010"},{name="a",value="0x603030"},{name="b",value="0x603050"},
{name="c",value="0x603070"},{name="d",value="0x603090"},
{name="len",value="7"}],file="i386-mpx-sigsegv.c",
fullname="i386-mpx-sigsegv.c",line="68"},thread-id="1",
stopped-threads="all",core="6"
2016-02-18 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* NEWS: Add entry for bound violation.
* amd64-linux-tdep.c (amd64_linux_init_abi_common):
Add handler for segmentation fault.
* gdbarch.sh (handle_segmentation_fault): New.
* gdbarch.c: Regenerate.
* gdbarch.h: Regenerate.
* i386-linux-tdep.c (i386_linux_handle_segmentation_fault): New.
(SIG_CODE_BONDARY_FAULT): New define.
(i386_linux_init_abi): Use i386_mpx_bound_violation_handler.
* i386-linux-tdep.h (i386_linux_handle_segmentation_fault) New.
* i386-tdep.c (i386_mpx_enabled): Add as external.
* i386-tdep.c (i386_mpx_enabled): Add as external.
* infrun.c (handle_segmentation_fault): New function.
(print_signal_received_reason): Use handle_segmentation_fault.
gdb/testsuite/ChangeLog:
* gdb.arch/i386-mpx-sigsegv.c: New file.
* gdb.arch/i386-mpx-sigsegv.exp: New file.
* gdb.arch/i386-mpx-simple_segv.c: New file.
* gdb.arch/i386-mpx-simple_segv.exp: New file.
gdb/doc/ChangeLog:
* gdb.texinfo (Signals): Add bound violation display hints for
a SIGSEGV.
When we're looking at a tracefile trace frame where registers are not
available, and the tracepoint has only one location, we supply
the location's address as the PC register. However, this only works
if PC is not a pseudo register, and individual architectures may want
to guess more registers. Add a gdbarch hook that will handle that.
gdb/ChangeLog:
* arch-utils.c (default_guess_tracepoint_registers): New function.
* arch-utils.h (default_guess_tracepoint_registers): New prototype.
* gdbarch.c: Regenerate.
* gdbarch.h: Regenerate.
* gdbarch.sh: Add guess_tracepoint_registers hook.
* tracefile.c (tracefile_fetch_registers): Use the new gdbarch hook.
exec_file_locate_attach allocates memory for full_exec_path (using
either exec_file_find, source_full_path_of or xstrdup) but this
memory is never freed. This commit adds the necessary cleanup.
gdb/ChangeLog:
* exec.c (exec_file_locate_attach): Add missing cleanup.
This patch fixes an internal error that occurs in
gdb.threads/forking-threads-plus-breakpoint.exp:
/blah/binutils-gdb/gdb/target.c:2723: internal-error: Can't determine the
current address space of thread Thread 3170.3170
In default_thread_address_space, find_inferior_ptid couldn't find 3170.3170
because it had been overwritten in inferior_appeared, called as follows:
inferior_appeared
remote_add_inferior
remote_notice_new_inferior
remote_update_thread_list
The cause of the problem was the following sequence of events:
* GDB knows only about the main thread
* the first fork event is reported to GDB, saved as pending_event
* qXfer:threads:read gets the threads from the remote.
remove_new_fork_children id's the fork child from the pending event
and removes it from the list reported to GDB. All the rest of the
threads, including the fork parent, are added to the GDB thread list.
* GDB stops all the threads. All the stop events are pushed onto the
stop reply queue behind the pending fork event. The fork waitstatus
is saved in the fork parent thread's pending status field
thread_info.suspend.
* remote_wait_ns calls queued_stop_reply and process_stop_reply to
remove the fork event from the front of the stop reply queue and save
event information in the thread_info structure for the fork parent
thread. Unfortunately, none of the information saved in this way is
the fork-specific information.
* A subsequent qXfer:threads:read packet gets the thread list including
the fork parent and fork child. remove_new_fork_children checks the
thread list to see if there is a fork parent, doesn't find one, checks
the stop reply queue for a pending fork event, doesn't find one, and
allows the fork child thread to be reported to GDB before the fork
event has been handled. remote_update_thread_list calls
remote_notice_new_thread and overwrites the current (main) thread in
inferior_appeared.
So the fork event has been reported out of target_wait but it was left
pending on the infrun side (infrun.c:save_waitstatus). IOW, the fork
event hasn't been processed by handle_inferior_event yet, so it hasn't
made it to tp->pending_follow yet.
The fix is to check thread_info.suspend along with the
thread_info.pending_follow in remote.c:remove_new_fork_children, to
prevent premature reporting of the fork child thread creation.
gdb/ChangeLog:
PR remote/19496
* remote.c (remove_new_fork_children): Check for pending
fork status in thread_info.suspend.
gdb/testsuite/ChangeLog:
PR remote/19496
* gdb.threads/forking-threads-plus-breakpoint.exp (do_test):
Remove kfail for PR remote/19496.
I see the following error in testing aarch64 GDB debugging arm
program.
(gdb) PASS: gdb.reverse/readv-reverse.exp: set breakpoint at marker2
continue
Continuing.
=================================================================
==32273==ERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x000000ce4c00 in thread T0
#0 0x2ba5615645c7 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.1+0x545c7)^M
#1 0x4be8b5 in VEC_CORE_ADDR_cleanup /home/yao/SourceCode/gnu/gdb/git/gdb/common/gdb_vecs.h:34^M
#2 0x5e6d95 in do_my_cleanups /home/yao/SourceCode/gnu/gdb/git/gdb/common/cleanups.c:154^M
#3 0x64c99a in fetch_inferior_event /home/yao/SourceCode/gnu/gdb/git/gdb/infrun.c:3975^M
#4 0x678437 in inferior_event_handler /home/yao/SourceCode/gnu/gdb/git/gdb/inf-loop.c:44^M
#5 0x5078f6 in remote_async_serial_handler /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:13223^M
#6 0x4cecfd in run_async_handler_and_reschedule /home/yao/SourceCode/gnu/gdb/git/gdb/ser-base.c:137^M
#7 0x676864 in gdb_wait_for_event /home/yao/SourceCode/gnu/gdb/git/gdb/event-loop.c:834^M
#8 0x676a27 in gdb_do_one_event /home/yao/SourceCode/gnu/gdb/git/gdb/event-loop.c:323^M
#9 0x676aed in start_event_loop /home/yao/SourceCode/gnu/gdb/git/gdb/event-loop.c:347^M
#10 0x6706d2 in captured_command_loop /home/yao/SourceCode/gnu/gdb/git/gdb/main.c:318^M
#11 0x66db8c in catch_errors /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:240^M
#12 0x6716dd in captured_main /home/yao/SourceCode/gnu/gdb/git/gdb/main.c:1157^M
#13 0x66db8c in catch_errors /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:240^M
#14 0x671b7a in gdb_main /home/yao/SourceCode/gnu/gdb/git/gdb/main.c:1165^M
#15 0x467684 in main /home/yao/SourceCode/gnu/gdb/git/gdb/gdb.c:32^M
#16 0x2ba563ed7ec4 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)^M
#17 0x4676b2 (/scratch/yao/gdb/build-git/aarch64-linux-gnu/gdb/gdb+0x4676b2)
looks we should discard cleanup if function
arm_linux_software_single_step returns early, or create cleanup when
it is needed.
gdb:
2016-02-16 Yao Qi <yao.qi@linaro.org>
* arm-linux-tdep.c (arm_linux_software_single_step): Assign
'old_chain' later.
Method syscall_next_pc of struct arm_get_next_pcs_ops has an argument
PC, which is not necessary, because PC can be got from regcache in
'struct arm_get_next_pcs'. This patch removes the PC argument of
syscall_next_pc.
gdb:
2016-02-16 Yao Qi <yao.qi@linaro.org>
* arch/arm-get-next-pcs.h (struct arm_get_next_pcs_ops)
<syscall_next_pc>: Remove argument PC. Callers updated.
* arm-linux-tdep.c (arm_linux_get_next_pcs_syscall_next_pc):
Remove argument PC. Get pc from regcache_read_pc.
* arm-tdep.c (arm_get_next_pcs_syscall_next_pc): Remove
argument PC.
gdb/gdbserver:
2016-02-16 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (get_next_pcs_syscall_next_pc): Remove argument
PC. Get pc from regcache_read_pc.
core_addr_to_string_nz returns string which has "0x" prefix, so don't
need to print "0x" again. This patch is to remove the "0x".
gdb:
2016-02-15 Yao Qi <yao.qi@linaro.org>
* aarch64-tdep.c (aarch64_analyze_prologue): Remove "0x".
GDB step cross kernel helpers only works if the kernel helpers are tail
called, which is the case how it is used in glibc. See __aeabi_read_tp
in sysdeps/unix/sysv/linux/arm/aeabi_read_tp.S. In __aeabi_read_tp,
branch/jump to the kernel helper is the last instruction, and the next
instruction address is in LR, which is in caller function. GDB can
handle this correctly. For example, glibc function __GI___ctype_init
calls __aeabi_read_tp
0xb6e19b30 <__GI___ctype_init+4>: ldr r3, [pc, #80] ;
0xb6e19b34 <__GI___ctype_init+8>: bl 0xb6e0a6e0 <__aeabi_read_tp>
0xb6e19b38 <__GI___ctype_init+12>: ldr r3, [pc, r3]
and __aeabi_read_tp calls kernel helper,
(gdb) disassemble __aeabi_read_tp
0xb6fef5d0 <+0>: mvn r0, #61440 ; 0xf000
0xb6fef5d4 <+4>: sub pc, r0, #31
once GDB or GDBserver single step instruction on 0xb6fef5d4, LR is
0xb6e19b38, which is right address of next instruction to set breakpoint
on.
However, if the kernel helpers are not tail-called, the LR is still the
address in the caller function of kernel helper's caller, which isn't
the right address of next instruction to set breakpoint on. For example,
we use kernel helper in main,
(gdb) disassemble main
....
0x00008624 <+32>: mov r3, #4064 ; 0xfe0^M
0x00008628 <+36>: movt r3, #65535 ; 0xffff^M
0x0000862c <+40>: blx r3
0x00008630 <+44>: ldr r3, [r11, #-8]
kernel helper is called on 0x0000862c and the expected next instruction
address is 0x00008630, but the LR now is the return address of main.
The problem here is LR may not have the right address because when we
single step the instruction, it isn't executed yet, so the LR isn't
updated. This patch fix this problem by decoding instruction, if the
instruction updates LR (BL and BLX), the next instruction address is
PC + INSN_SIZE, otherwise, get the address of next instruction from LR.
gdb:
2016-02-12 Yao Qi <yao.qi@linaro.org>
* arch/arm-linux.c (arm_linux_get_next_pcs_fixup): Calculate
nextpc according to instruction.
gdb/testsuite:
2016-02-12 Yao Qi <yao.qi@linaro.org>
* gdb.arch/arm-single-step-kernel-helper.c: New.
* gdb.arch/arm-single-step-kernel-helper.exp: New.
When I exercise GDBserver software single step, I see the following
error, which has been already handled by GDB properly.
In GDBserver log, we can see, GDBserver tries to single step instruction
on 0xb6e0a6e4, and destination address is 0xffff0fe0,
stop pc is 0xb6e0a6e4
Writing f001f0e7 to 0xffff0fe0 in process 7132
Failed to insert breakpoint at 0xffff0fe0 (Input/output error).
Failed to insert breakpoint at 0xffff0fe0 (-1).
(gdb) disassemble __aeabi_read_tp,+8
Dump of assembler code from 0xb6e0a6e0 to 0xb6e0a6e8:
0xb6e0a6e0 <__aeabi_read_tp+0>: mvn r0, #61440 ; 0xf000
0xb6e0a6e4 <__aeabi_read_tp+4>: sub pc, r0, #31
however, it fails inserting breakpoint there. This problem has already
fixed by GDB, see comments in arm-linux-tdep.c:arm_linux_software_single_step
/* The Linux kernel offers some user-mode helpers in a high page. We can
not read this page (as of 2.6.23), and even if we could then we
couldn't set breakpoints in it, and even if we could then the atomic
operations would fail when interrupted. They are all called as
functions and return to the address in LR, so step to there
instead. */
so we need to do the same thing in GDB side as well. This patch adds
a new field fixup in arm_get_next_pcs_ops, so that we can fix up PC
for arm-linux target. In this way, both GDB and GDBserver can single
step instructions going to kernel helpers.
gdb:
2016-02-12 Yao Qi <yao.qi@linaro.org>
* arch/arm-get-next-pcs.c (arm_get_next_pcs): Call
self->ops->fixup if it isn't NULL.
* arch/arm-get-next-pcs.h: Include gdb_vecs.h.
(struct arm_get_next_pcs_ops) <fixup>: New field.
* arch/arm-linux.c: Include common-regcache.h and
arch/arm-get-next-pcs.h.
(arm_linux_get_next_pcs_fixup): New function.
* arch/arm-linux.h (arm_linux_get_next_pcs_fixup): Declare.
* arm-linux-tdep.c (arm_linux_get_next_pcs_ops): Initialize
it with arm_linux_get_next_pcs_fixup.
(arm_linux_software_single_step): Move code to
arm_linux_get_next_pcs_fixup.
* arm-tdep.c (arm_get_next_pcs_ops): Initialize it.
gdb/gdbserver:
2016-02-12 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (get_next_pcs_ops): Initialize it with
arm_linux_get_next_pcs_fixup.
In skip_artificial_frames we repeatedly call get_prev_frame_always until we get
a non-inline and non-tailcall frame assuming that there must be such a frame
eventually.
For record targets, however, we may have a frame chain that consists only of
artificial frames. This leads to a crash in get_frame_type when dereferencing a
NULL frame pointer.
Change skip_artificial_frames and skip_tailcall_frames to return NULL in such a
case and modify each caller to cope with a NULL return.
In frame_unwind_caller_pc and frame_unwind_caller_arch, we simply assert that
the returned value is not NULL. Their caller was supposed to check
frame_unwind_caller_id before calling those functions.
In other cases, we thrown an error.
In infcmd further move the skip_tailcall_frames call to the forward-stepping
case since we don't need a frame for reverse execution and we don't want to fail
because of that. Reverse-finish does make sense for a tailcall frame.
gdb/
* frame.h (skip_tailcall_frames): Update comment.
* frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL
if only artificial frames are found. Update comment.
(frame_unwind_caller_id): Handle NULL return.
(frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that
skip_artificial_frames does not return NULL.
(frame_pop): Add an error if only tailcall frames are found.
* infcmd.c (finish_command): Move skip_tailcall_frames call into forward-
execution case. Add an error if only tailcall frames are found.
testsuite/
* gdb.btrace/tailcall-only.exp: New.
* gdb.btrace/tailcall-only.c: New.
* gdb.btrace/x86_64-tailcall-only.S: New.
* gdb.btrace/i686-tailcall-only.S: New.
Callers of frame_unwind_caller_* functions are supposed to check
frame_unwind_caller_id.
Add such a check to frame_info and treat an invalid caller ID as if the caller
PC were not available.
gdb/
* stack.c (frame_info): Check frame_unwind_caller_id.
Currently, you can cd to the gdb/testsuite/ dir and use
make check-parallel, instead of using FORCE_PARALLEL:
$ make -j8 check-parallel RUNTESTFLAGS="--target_board=native-gdbserver"
$ make -j8 check RUNTESTFLAGS="--target_board=native-gdbserver" FORCE_PARALLEL=1
But you can't do that in the build/gdb/ dir:
$ make check-parallel RUNTESTFLAGS="--target_board=native-gdbserver"
make: *** No rule to make target `check-parallel'. Stop.
I find check-parallel a bit more convenient, and more typo-proof, so
this patch makes it work from the gdb build dir too.
While documenting this in testsuite/README, I found that the parallel
testing mode would better be pulled out to its own section and
extended.
gdb/ChangeLog:
2016-02-11 Pedro Alves <palves@redhat.com>
* Makefile.in (check-parallel): New rule.
gdb/testsuite/ChangeLog:
2016-02-11 Pedro Alves <palves@redhat.com>
* README (Parallel testing): New section.
(GDB_PARALLEL): Rewrite.
(FORCE_PARALLEL): Document.
This function is never used, since it is superseded by
arm_linux_displaced_step_copy_insn.
gdb/ChangeLog:
* arm-tdep.c (arm_displaced_step_copy_insn): Remove.
(ARM displaced stepping support): Remove reference to
arm_displaced_step_copy_insn in comment.
* arm-tdep.h (arm_displaced_step_copy_insn): Remove.
* arm-linux-tdep.c (arm_linux_displaced_step_copy_insn): Remove
reference to arm_displaced_step_copy_insn in comment.
Almost obvious... change the type of some insn parameters, so that it
matches the rest of the code.
gdb/ChangeLog:
* arm-tdep.c (thumb_copy_unmodified_16bit): Change type of insn.
(thumb_copy_b): Likewise.
(arm_decode_b_bl_ldmstm): Likewise.
(thumb_copy_16bit_ldr_literal): Likewise.
(thumb_copy_pop_pc_16bit): Likewise.
This patch uses the target architecture rather then the objfile
architecture when encoding tracepoint actions.
The target architecture may contain additional registers. E.g. ARM VFP
registers. This information is needed to allow their collection. Since we
can never know whether the registers numbers in the target match the
binary's we have to use tdesc here.
One note about combined debuggers / multi-inferior from Pedro Alves:
In the combined debugger case taking Cell as the practical example that
gdb supports currently:
In that case, the main target_gdbarch() will be powerpc, but you may have set a
tracepoint on _spu_ code, which has a different gdbarch. so for that case,
target_gdbarch would be wrong. I think that in that case, we'd need to
find __the_ target/tdesc gdbarch that is (bfd) compatible with the
objfile's gdbarch.
I think cell/spu gdbserver doesn't support tracepoints, so we can ignore
this for now.
The multi-inferior/process case is somewhat related, but its simpler.
each inferior has its own gdbarch.
That is, target_gdbarch depends on the current inferior selected.
In fact, that just returns inferior->gdbarch nowaways.
No regressions, tested on ubuntu 14.04 ARMv7 and x86.
With gdbserver-{native,extended} / { -marm -mthumb }
gdb/ChangeLog:
* tracepoint.c (encode_actions_1): Use target_gdbarch () rather
than loc->gdbarch.
tfile_fetch_registers currently wrongly fetches registers using
gdb order instead of g packet order. On x86_64 with AVX, this causes
problems with ymm*h and orig_rax registers: gdb has ymm*h first, while
g packet has orig_rax first.
gdb/ChangeLog:
* tracefile-tfile.c (tfile_fetch_registers): Use g packet order
instead of gdb order.
gdb/doc/ChangeLog:
* gdb.texinfo (Trace File Format): Remove misleading information
about register block ordering.
This resulted in the last register being considered unavailable.
On plain x86_64 (without AVX), this happened to be orig_rax.
gdb/ChangeLog:
* tracefile-tfile.c (tfile_fetch_registers): Fix off-by-one in bounds
check.
Now that the GDB 7.11 branch has been created, we can
bump the version number.
gdb/ChangeLog:
GDB 7.11 branch created (9ef9e6a6a0):
* version.in: Bump version to 7.11.50.DATE-git.
One of the last checks update_breakpoints_after_exec does while looping
over the list of breakpoints is check that the breakpoint has a valid
location spec. It uses event_location_empty_p to check if the location spec
is "empty", and if it is, the breakpoint is deleted.
momentary_breakpoint types rely on setting the breakpoint structure's
location spec to NULL, thereby causing an update to delete the breakpoint.
However, event_location_empty_p assumed that locations were never NULL.
As a result, GDB would crash dereferencing a NULL pointer whenever
update_breakpoints_after_exec would encounter a momentary_breakpoint.
This patch creates a new wrapper/helper function which tests that the given
breakpoint's location spec is non-NULL and if it is not "empty"
or "unspecified."
gdb/ChangeLog
PR breakpoints/19546
* breakpoint.c (breakpoint_event_location_empty_p): New function.
(update_breakpoints_after_exec, bkpt_re_set): Use this new function
instead of event_location_empty_p.
gdb/testsuite/ChangeLog
PR breakpoints/19546
* gdb.base/infcall-exec.c: New file.
* gdb.base/infcall-exec2.c: New file.
* gdb.base/infcall-exec.exp: New file.
MI is currently using string_to_event_location to enable the use of legacy
linespecs, but using this function (until this patchset) had the (as yet
unnoticed) side effect of allowing both MI and CLI representation for
explicit locations.
This patch simply changes MI to use the same legacy linespec functions
that the python and guile interpreters use. This eliminates the CLI syntax
for explicit locations (in MI).
gdb/ChangeLog
* mi/mi-cmd-break.c (mi_cmd_break_insert_1): Use
string_to_event_location_basic instead of string_to_event_location.
This patch, analogous to the previous python patch, implements proper
legacy linespec support in guile code using the newly introduced
string_to_event_location_basic.
gdb/ChangeLog
* guile/scm-breakpoint.c (gdbscm_register_breakpoint_x): Skip
leading whitespace and use string_to_event_location_basic instead
of new_linespec_location.
gdb/testsuite/ChangeLog
* gdb.guile/scm-breakpoint.exp (test_bkpt_address): New procedure.
(toplevel): Call test_bkpt_address.
Now that "legacy" linespecs benefit from consolidated support in
string_to_event_location_basic, python's Breakpoint command should use this
function to turn strings into event locations.
As a result, this patch fixes python/19506. Before:
(gdb) python gdb.Breakpoint("*main")
Traceback (most recent call last):
File "<string>", line 1, in <module>
RuntimeError: Function "*main" not defined.
Error while executing Python code.
After:
(gdb) python gdb.Breakpoint("*main")
Breakpoint 1 at 0x4005fb: file ../../../src/gdb/testsuite/gdb.python/py-breakpoint.c, line 32.
gdb/ChangeLog
PR python/19506
* python/py-breakpoint.c (bppy_init): Use
string_to_event_location_basic instead of new_linespec_location.
gdb/testsuite/ChangeLog
PR python/19506
* gdb.python/py-breakpoint.exp (test_bkpt_address): New procedure.
(toplevel): Call test_bkpt_address.
This patch refactors string_to_event_location, breaking it into two
separate functions:
1) string_to_event_location_basic
A "basic" string parser that implements support for "legacy" linespecs
(linespec, address, and probe locations). This function is intended to
be used by any UI wishing/needing to support this legacy behavior.
2) string_to_event_location
This is now intended as a CLI-only function which adds explicit location
parsing in a CLI-appropriate manner (in the form of traditional option/value
pairs).
Together these patches serve to simplify string-to-event location parsing
for all existing non-CLI interfaces (MI, guile, and python).
gdb/ChangeLog
* location.c (string_to_explicit_location): Note that "-p" is
reserved for probe locations and return NULL for any input
that starts with that.
(string_to_event_location): Move "legacy" linespec code to ...
(string_to_event_location_basic): ... here.
* location.h (string_to_event_location): Update comment.
(string_to_event_location_basic): New function.
Using AC_OUTPUT with arguments has been deprecated for some time in
autoconf, even in version 2.64, which we are using. This change should
not affect functionality.
I also removed the "exit 0"'s, they shouldn't be necessary.
gdb/ChangeLog:
* configure.ac: Use AC_CONFIG_FILES instead of passing arguments
to AC_OUTPUT. Remove "exit 0" at the end.
* configure: Regenerate.
gdb/testsuite/ChangeLog:
* configure.ac: Use AC_CONFIG_FILES instead of passing arguments
to AC_OUTPUT.
* configure: Regenerate.
gdb/gdbserver/ChangeLog:
* configure.ac: Use AC_CONFIG_FILES instead of passing arguments
to AC_OUTPUT.
* configure: Regenerate.
PR19548 shows that we still have problems related to 13fd3ff343:
[PR17431: following execs with "breakpoint always-inserted on"]
https://sourceware.org/ml/gdb-patches/2014-09/msg00733.html
The problem this time is that we currently update the global location
list and try to insert breakpoint locations after re-setting _each_
breakpoint in turn.
Say:
- We have _more_ than one breakpoint set. Let's assume 2.
- There's a breakpoint with a pre-exec address that ends up being an
unmapped address after the exec.
- That breakpoint is NOT the first in the breakpoint list.
Then when handling an exec, and we re-set the first breakpoint in the
breakpoint list, we mistakently try to install the old pre-exec /
un-re-set locations of the other breakpoint, which fails:
(gdb) continue
Continuing.
process 28295 is executing new program: (...)/execl-update-breakpoints2
Error in re-setting breakpoint 1: Warning:
Cannot insert breakpoint 2.
Cannot access memory at address 0x1000764
Breakpoint 1, main (argc=1, argv=0x7fffffffd368) at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.base/execl-update-breakpoints.c:34
34 len = strlen (argv[0]);
(gdb)
Fix this by deferring the global location list update till after all
breakpoints are re-set.
Tested on x86_64 Fedora 20, native and gdbserver.
gdb/ChangeLog:
2016-02-09 Pedro Alves <palves@redhat.com>
PR breakpoints/19548
* breakpoint.c (create_overlay_event_breakpoint): Don't update
global location list here.
(create_longjmp_master_breakpoint)
(create_std_terminate_master_breakpoint)
(create_exception_master_breakpoint, create_jit_event_breakpoint)
(update_breakpoint_locations):
(breakpoint_re_set): Update global location list after all
breakpoints are re-set.
gdb/testsuite/ChangeLog:
2016-02-09 Pedro Alves <palves@redhat.com>
PR breakpoints/19548
* gdb.base/execl-update-breakpoints.c (some_function): New
function.
(main): Call it.
* gdb.base/execl-update-breakpoints.exp: Add a second breakpoint.
Tighten expected GDB output.
I built remote.c with -Wunused, to check a function I was working on,
turns out there is a bunch of unused variables.
gdb/ChangeLog:
* remote.c (remote_register_number_and_offset): Remove unused
variable(s).
(remote_thread_always_alive): Likewise.
(remote_update_thread_list): Likewise.
(process_initial_stop_replies): Likewise.
(remote_start_remote): Likewise.
(remote_check_symbols): Likewise.
(discard_pending_stop_replies): Likewise.
(process_stop_reply): Likewise.
(putpkt_binary): Likewise.
(getpkt): Likewise.
(remote_add_target_side_condition): Likewise.
(remote_insert_breakpoint): Likewise.
(remote_supports_stopped_by_sw_breakpoint): Likewise.
(remote_supports_stopped_by_hw_breakpoint): Likewise.
(remote_xfer_partial): Likewise.
(remote_read_btrace): Likewise.
(remote_async_serial_handler): Likewise.
(remote_thread_events): Likewise.
(_initialize_remote): Likewise.
This patch removes some dead code.
I noticed that varobj_delete was always called with dellist == NULL, so
I started removing that parameter. That allows removing a good chunk of
the code in varobj_delete, making it almost trivial. We can also remove
the resultp parameters in that whole trail. In turn, this shows that
struct cpstack, cppush and cppop were only used fo that mechanism, so
they can be removed as well.
I also moved the function comment to the header file to comply with
today's guideline, even though the rest of the file does not respect it
(yet).
gdb/ChangeLog:
* varobj.h (varobj_delete): Remove dellist parameter, update and
move documentation here.
* varobj.c (struct cpstack, cppush, cppop): Remove.
(delete_variable): Remove resultp (first) parameter.
(delete_variable_1): Likewise.
(varobj_delete): Remove dellist parameter and unused code.
(update_dynamic_varobj_children): Adjust varobj_delete call.
(update_type_if_necessary): Likewise.
(varobj_set_visualizer): Likewise.
(varobj_update): Likewise.
(value_of_root): Likewise.
(varobj_invalidate_iter): Likewise.
* mi/mi-cmd-var.c (mi_cmd_var_delete): Likewise.
Hi,
I see this error when GDB connects with qemu,
(gdb) n
....
Sending packet: $vCont;c#a8...Ack
Packet received: Ffstat,00000001,f6fff038
Cannot execute this command while the target is running.
Use the "interrupt" command to stop the target
and then try again.
looks we don't set rs->waiting_for_stop_reply to zero
before handle fileio request,
#10 0x00000000005edb64 in target_write (len=64, offset=4143968312, buf=0x7fffffffd570 "\375\377\377\377", annex=0x0, object=TARGET_OBJECT_MEMORY,
ops=<optimised out>) at /home/yao/SourceCode/gnu/gdb/git/gdb/target.c:1922
#11 target_write_memory (memaddr=memaddr@entry=4143968312, myaddr=myaddr@entry=0x7fffffffd6a0 "", len=len@entry=64)
at /home/yao/SourceCode/gnu/gdb/git/gdb/target.c:1500
#12 0x00000000004b2b41 in remote_fileio_func_fstat (buf=0x127b258 "") at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1037
#13 0x00000000004b1878 in do_remote_fileio_request (uiout=<optimised out>, buf_arg=buf_arg@entry=0x127b240)
at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1204
#14 0x00000000005b8c7c in catch_exceptions_with_msg (func_uiout=<optimised out>, func=func@entry=0x4b1800 <do_remote_fileio_request>,
func_args=func_args@entry=0x127b240, gdberrmsg=gdberrmsg@entry=0x0, mask=mask@entry=RETURN_MASK_ALL)
at /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:187
#15 0x00000000005b8dea in catch_exceptions (uiout=<optimised out>, func=func@entry=0x4b1800 <do_remote_fileio_request>, func_args=func_args@entry=0x127b240,
mask=mask@entry=RETURN_MASK_ALL) at /home/yao/SourceCode/gnu/gdb/git/gdb/exceptions.c:167
#16 0x00000000004b2fff in remote_fileio_request (buf=0x127b240 "Xf6fff038,0:", ctrlc_pending_p=0) at /home/yao/SourceCode/gnu/gdb/git/gdb/remote-fileio.c:1255
#17 0x0000000000496f12 in remote_wait_as (ptid=..., status=0x7fffffffdb20, options=1) at /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:6997
however, we did set rs->waiting_for_stop_reply to zero before Luis's
patch https://sourceware.org/ml/gdb-patches/2015-10/msg00336.html
In fact, Luis's patch v1
https://sourceware.org/ml/gdb-patches/2015-08/msg00809.html is about
setting rs->waiting_for_stop_reply back to one after
remote_fileio_request, which is correct. However during the review, the
patch is changed and ends up with "not setting rs->waiting_for_stop_reply
to zero".
I manually test GDB, but I don't have a way to run regression tests.
gdb:
2016-02-04 Yao Qi <yao.qi@linaro.org>
* remote.c (remote_wait_as): Set rs->waiting_for_stop_reply to
0 before handling 'F' and set it back afterwards.
This is unused since 54eb231c4b, where
static arrays of ui_out_levels were replaced with vectors.
gdb/ChangeLog:
* ui-out.c (MAX_UI_OUT_LEVELS): Remove.
New bnds fields will be always present for x86 architecture.
Fixup for compatibility layer 32bits has to be fixed.
It was added the nat_siginfo to serving as intermediate step
between kernel provided siginfo and the fix up routine.
When executing compat_siginfo_from_siginfo or
compat_x32_siginfo_from_siginfo first the buffer read from the kernel are
converted into the nat_signfo for homogenization, then the fields of
nat_siginfo are use to set the compat and compat_x32 siginfo fields.
In other to make this conversion independent of the system where gdb
is compiled the most complete version of the siginfo, named as native
siginfo, is used internally as an intermediate step.
Conversion using nat_siginfo is exemplified below:
compat_siginfo_from_siginfo or compat_x32_siginfo_from_siginfo:
buffer (from the kernel) -> nat_siginfo -> 32 / X32 siginfo
(memcpy) (field by field)
siginfo_from_compat_x32_siginfo or siginfo_from_compat_siginfo:
32 / X32 siginfo -> nat_siginfo -> buffer (to the kernel)
(field by field) (memcpy)
Caveat: No support for MPX on x32.
2016-02-02 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* amd64-linux-siginfo.c (nat_siginfo_t, nat_sigval_t, nat_timeval):
New types.
(compat_siginfo): New bound fields added.
(compat_x32_siginfo): New field added.
(cpt_si_addr_lsb): New define.
(compat_siginfo_from_siginfo): Use nat_siginfo.
(siginfo_from_compat_siginfo): Use nat_siginfo.
(compat_x32_siginfo_from_siginfo): Likewise.
(siginfo_from_compat_x32_siginfo): Likewise.
Both Linux and glibc have introduced bound related fields in the
segmentation fault fields of the siginfo_t type. Add the new fields
to our x86's siginfo_t type too.
Kernel patch:
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=ee1b58d36aa1b5a79eaba11f5c3633c88231da83
Glibc patch:
d4358b51c2
2016-02-02 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* linux-tdep.c (linux_get_siginfo_type): Add the _addr_bnd
structure to the siginfo if extra_fields contains
LINUX_SIGINFO_FIELD_ADDR_BND.
Use linux_get_siginfo_type_with_fields for adding bound fields on
segmentation fault for i386/amd64 siginfo.
2016-02-02 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* linux-tdep.h (linux_get_siginfo_type_with_fields): Make extern.
* linux-tdep.c (linux_get_siginfo_type_with_fields): Make extern.
* i386-linux-tdep.h (x86_linux_get_siginfo_type): New
function.
* amd64-linux-tdep.c (amd64_linux_init_abi_common): Add
x86_linux_get_siginfo_type for the amd64 abi.
* i386-linux-tdep.c (x86_linux_get_siginfo_type): New
function.
(i386_linux_init_abi): Add new function at the i386 ABI
initialization.
First add new structure and function to allow architecture customization
for the siginfo structure.
2016-01-15 Walfred Tedeschi <walfred.tedeschi@intel.com>
gdb/ChangeLog:
* linux-tdep.h (linux_siginfo_extra_field_values): New enum values.
(linux_siginfo_extra_fields): New enum type.
* linux-tdep.c (linux_get_siginfo_type_with_fields): New function.
(linux_get_siginfo_type): Use new function.
For languages with dynamic types, an incorrect program, or uninitialised
variables within a program, could result in an incorrect, overly large
type being associated with a value. Currently, attempting to print such
a variable will result in gdb trying to allocate an overly large buffer.
If this large memory allocation fails then the result can be gdb either
terminating, or (due to memory contention) becoming unresponsive for the
user.
A new user visible variable in gdb helps guard against such problems,
two new commands are available:
set max-value-size
show max-value-size
The 'max-value-size' is the maximum size of memory in bytes that gdb
will allocate for the contents of a value. Any attempt to allocate a
value with a size greater than this will result in an error. The
initial default for this limit is set at 64k, this is based on a similar
limit that exists within the ada specific code.
It is possible for the user to set max-value-size to unlimited, in which
case the old behaviour is restored.
gdb/ChangeLog:
* value.c (max_value_size): New variable.
(MIN_VALUE_FOR_MAX_VALUE_SIZE): New define.
(show_max_value_size): New function.
(check_type_length_before_alloc): New function.
(allocate_value_contents): Call check_type_length_before_alloc.
(set_value_enclosing_type): Likewise.
(_initialize_values): Add set/show handler for max-value-size.
* NEWS: Mention new set/show command.
gdb/doc/ChangeLog:
* gdb.texinfo (Value Sizes): New section.
(Data): Add the 'Value Sizes' node to the menu.
gdb/testsuite/ChangeLog:
* gdb.base/max-value-size.c: New file.
* gdb.base/max-value-size.exp: New file.
* gdb.base/huge.exp: Disable max-value-size for this test.
A few typos. The comment about varobj_create has been misplaced since
the dawn of time.
gdb/ChangeLog:
* varobj.h (struct varobj): Fix typos in comments.
(struct lang_varobj_ops): Likewise.
* varobj.c (VAROBJ_TABLE_SIZE): Likewise.
(varobj_create): Move misplaced comment.
Two small changes so everything builds with latest GCC and its
-Wmisleading-indentation.
In the aarch64-tdep.c case, the two misindented lines should actually be
part of the for loop. It looks like the indentation is all done using
spaces in that file though... I fixed it (changed for tabs + spaces) for
the lines I touched.
In the xcoffread.c case, we can simply remove the braces and fix the
indentation.
gdb/ChangeLog:
* aarch64-tdep.c (aarch64_record_asimd_load_store): Add braces
to for include additional lines.
* xcoffread.c (scan_xcoff_symtab): Remove unnecessary braces.
rawmemchr is a dependency of strchrnul, so it should be explicitly
listed.
gdb/ChangeLog:
* gnulib/import/Makefile.am: Regenerate.
* gnulib/import/Makefile.in: Regenerate.
* gnulib/import/m4/gnulib-cache.m4: Regenerate.
* gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add rawmemchr.
For a forthcoming patch, I need a "skip_to_colon" function. I noticed
there are two skip_to_semicolon (one in gdb and one in gdbserver). I
thought we could put it in common/, and generalize it for any character.
It turns out that the strchrnul function does exactly that. I imported
the corresponding module from gnulib, for those systems that do not have
it.
There are probably more places where this function can be used instead
of doing the work by hand (I am looking at
remote-utils.c::look_up_one_symbol).
gdb/ChangeLog:
* remote.c (skip_to_semicolon): Remove.
(remote_parse_stop_reply): Use strchrnul instead of
skip_to_semicolon.
* gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add
strchrnul.
* gnulib/aclocal.m4: Regenerate.
* gnulib/config.in: Regenerate.
* gnulib/configure: Regenerate.
* gnulib/import/Makefile.am: Regenerate.
* gnulib/import/Makefile.in: Regenerate.
* gnulib/import/m4/gnulib-cache.m4: Regenerate.
* gnulib/import/m4/gnulib-comp.m4: Regenerate.
* gnulib/import/m4/rawmemchr.m4: New file.
* gnulib/import/m4/strchrnul.m4: New file.
* gnulib/import/rawmemchr.c: New file.
* gnulib/import/rawmemchr.valgrind: New file.
* gnulib/import/strchrnul.c: New file.
* gnulib/import/strchrnul.valgrind: New file.
gdb/gdbserver/ChangeLog:
* server.c (skip_to_semicolon): Remove.
(process_point_options): Use strchrnul instead of
skip_to_semicolon.
I see GDB crashes in dprintf.exp on aarch64-linux testing,
(gdb) PASS: gdb.base/dprintf.exp: agent: break 29
set dprintf-style agent^M
(gdb) PASS: gdb.base/dprintf.exp: agent: set dprintf style to agent
continue^M
Continuing.
ASAN:SIGSEGV
=================================================================
==22475==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x000000494820 sp 0x7fff389b83a0 bp 0x62d000082417 T0)
#0 0x49481f in remote_add_target_side_commands /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:9190^M
#1 0x49e576 in remote_add_target_side_commands /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:9174^M
#2 0x49e576 in remote_insert_breakpoint /home/yao/SourceCode/gnu/gdb/git/gdb/remote.c:9240^M
#3 0x5278b7 in insert_bp_location /home/yao/SourceCode/gnu/gdb/git/gdb/breakpoint.c:2734^M
#4 0x52ac09 in insert_breakpoint_locations /home/yao/SourceCode/gnu/gdb/git/gdb/breakpoint.c:3159^M
#5 0x52ac09 in update_global_location_list /home/yao/SourceCode/gnu/gdb/git/gdb/breakpoint.c:12686
the root cause of this problem in this case is about linespec and
symtab which produces additional incorrect location and a NULL is added to
bp_tgt->tcommands. I posted a patch
https://sourceware.org/ml/gdb-patches/2015-12/msg00321.html to fix it
in linespec (the fix causes regression), but GDB still shouldn't add
NULL into bp_tgt->tcommands. The logic of build_target_command_list
looks odd to me. If we get something wrong in parse_cmd_to_aexpr (it
returns NULL), we shouldn't continue, instead we should set flag
null_command_or_parse_error. This is what this patch does. In the
meantime, we find build_target_condition_list has the same problem, so
fix it too.
gdb:
2016-01-28 Yao Qi <yao.qi@linaro.org>
* breakpoint.c (build_target_command_list): Don't call continue
if aexpr is NULL.
(build_target_condition_list): Likewise.
Nowadays, get_next_pcs in linux_target_ops has two parameters PC
and REGCACHE. Parameter PC looks redundant because it can be go
from REGCACHE. The patch is to remove PC from the arguments for
various functions.
gdb:
2016-01-26 Yao Qi <yao.qi@linaro.org>
* arch/arm-get-next-pcs.c (thumb_deal_with_atomic_sequence_raw):
Remove argument pc. Get pc by regcache_read_pc. Callers updated.
(arm_deal_with_atomic_sequence_raw): Likewise.
(thumb_get_next_pcs_raw): Likewise.
(arm_get_next_pcs_raw): Likewise.
(arm_get_next_pcs): Remove argument pc. Callers updated.
* arch/arm-get-next-pcs.h (arm_get_next_pcs): Update declaration.
gdb/gdbserver:
2016-01-26 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (arm_gdbserver_get_next_pcs): Remove argument pc.
* linux-low.c (install_software_single_step_breakpoints): Don't
call regcache_read_pc.
* linux-low.h (struct linux_target_ops) <get_next_pcs>: Remove
argument pc.
GCC6 will warn about misleading indentation issues like:
gdb/ada-lang.c: In function ‘ada_evaluate_subexp’:
ada-lang.c:11423:9: error: statement is indented as if it were guarded by...
arg1 = unwrap_value (arg1);
^~~~
gdb/ada-lang.c:11421:7: note: ...this ‘else’ clause, but it is not
else
^~~~
In this case it would be a bug except for the fact the if clause already
returned early. So this misindented statement really only got executed
for the else case. But it could easily mislead a reader, so adding a
proper else block is the correct solution.
In case of c-typeprint.c (c_type_print_base) the if statement is indeed
misleadingly indented, but not a bug. Just indent correctly. The inflow.c
(terminal_ours_1) misindented block comes from the removal of an if clause
in commit d9d2d8b which looks correct. Just introduce an else to fixup the
indentation of the block. The linux-record.c misleadingly indented return
statements are just that. Misleading to the reader, but not actual bugs.
Just unindent them so they don't look like they fall under the wrong if
clause.
If you have "set follow-fork child" set, then if you do "info threads"
right after a fork, and before the child reports any other event to
GDB core, you'll see:
(gdb) info threads
Id Target Id Frame
* 1.1 Thread 0x7ffff7fc1740 (LWP 31875) "fork-plus-threa" (running)
2.1 process 31879 "fork-plus-threa" Selected thread is running.
(gdb)
The "Selected thread is running." bit is a bogus error. That was GDB
trying to fetch the current frame of thread 2.1, because the external
runnning state is "stopped", and then throwing an error because the
thread is actually running.
This actually affects all-stop + schedule-multiple as well.
The problem here is that on a fork event, GDB doesn't update the
external parent/child running states.
New comprehensive test included. The "kill inferior 1" / "kill
inferior 2" bits also trip on PR gdb/19494 (hang killing unfollowed
fork children), which was fixed by the previous patch.
gdb/ChangeLog:
2016-01-25 Pedro Alves <palves@redhat.com>
PR threads/19461
* infrun.c (handle_inferior_event_1) <fork/vfork>: Update
parent/child running states.
gdb/testsuite/ChangeLog:
2016-01-25 Pedro Alves <palves@redhat.com>
PR threads/19461
* gdb.base/fork-running-state.c: New file.
* gdb.base/fork-running-state.exp: New file.
linux_nat_kill relies on get_last_target_status to determine whether
the current inferior is stopped at a unfollowed fork/vfork event.
This is bad because many things can happen ever since we caught the
fork/vfork event... This commit rewrites that code to instead walk
the thread list looking for unfollowed fork events, similarly to what
was done for remote.c.
New test included. The main idea of the test is make sure that when
the program stops for a fork catchpoint, and the user kills the
parent, gdb also kills the unfollowed fork child. Since the child
hasn't been added as an inferior at that point, we need some other
portable way to detect that the child is gone. The test uses a pipe
for that. The program forks twice, so you have grandparent, child and
grandchild. The grandchild inherits the write side of the pipe. The
grandparent hangs reading from the pipe, since nothing ever writes to
it. If, when GDB kills the child, it also kills the grandchild, then
the grandparent's pipe read returns 0/EOF and the test passes.
Otherwise, if GDB doesn't kill the grandchild, then the pipe read
never returns and the test times out, like:
FAIL: gdb.base/catch-fork-kill.exp: fork-kind=fork: exit-kind=kill: fork: kill parent (timeout)
FAIL: gdb.base/catch-fork-kill.exp: fork-kind=vfork: exit-kind=kill: vfork: kill parent (timeout)
No regressions on x86_64 Fedora 20. New test passes with gdbserver as
well.
gdb/ChangeLog:
2016-01-25 Pedro Alves <palves@redhat.com>
PR gdb/19494
* linux-nat.c (kill_one_lwp): New, factored out from ...
(kill_callback): ... this.
(kill_wait_callback): New, factored out from ...
(kill_wait_one_lwp): ... this.
(kill_unfollowed_fork_children): New function.
(linux_nat_kill): Use it.
gdb/testsuite/ChangeLog:
2016-01-25 Pedro Alves <palves@redhat.com>
PR gdb/19494
* gdb.base/catch-fork-kill.c: New file.
* gdb.base/catch-fork-kill.exp: New file.
The prior format led to confusing messages when threads were created
or added such as "[New process 14757, LWP 100537]". The new format
reports this as "[New LWP 100434 of process 15652]".
gdb/ChangeLog:
* fbsd-nat.c (fbsd_pid_to_str): Adjust string format.
I see the following test fail on native arm-linux gdb testing...
(gdb) PASS: gdb.base/killed-outside.exp: registers: get pid of inferior
Executing on target: kill -9 2346 (timeout = 300)
spawn kill -9 2346^M
flushregs^M
Register cache flushed.^M
warning: Unable to fetch general registers.^M
PC not available^M
(gdb) PASS: gdb.base/killed-outside.exp: registers: flushregs
info threads^M
Id Target Id Frame ^M
* 1 process 2346 "killed-outside" (gdb) FAIL: gdb.base/killed-outside.exp: registers: info threads (timeout)
since the inferior disappeared, ptrace will fail. In that case, the
exception should be thrown, so that the caller can handle that.
gdb:
2016-01-22 Yao Qi <yao.qi@linaro.org>
* arm-linux-nat.c (fetch_fpregs): Call perror_with_name
instead of warning.
(store_fpregs, fetch_regs, store_regs): Likewise.
(fetch_wmmx_regs, store_wmmx_regs): Likewise.
(fetch_vfp_regs, store_vfp_regs): Likewise.
String collection always used ref32 to fetch the string pointer. Make it
use gen_fetch instead.
As a side effect, this patch changes dup+const+trace+pop sequence used
for collecting the string's address to a trace_quick opcode. This
results in a shorter agent expression.
This appeared to work on x86_64 since it's a little-endian platform, and
malloc (used in gdb.trace/collection.exp) returns addresses in low 4GB.
Noticed and tested on s390x-ibm-linux-gnu, also tested on
i686-unknown-linux-gnu and x86_64-unknown-linux-gnu.
gdb/ChangeLog:
* ax-gdb.c (gen_traced_pop): Use gen_fetch for string collection.
Give the function a better name (drop "maybe_") and update the header
comment.
gdb/ChangeLog:
* disasm.c (maybe_add_dis_line_entry): Rename to...
(add_dis_line_entry): ...this, and update header comment.
(do_mixed_source_and_assembly): Now use add_dis_line_entry.
Currently, even when built with --enable-build-with-cxx, gdb uses
CFLAGS instead of CXXFLAGS. This commit fixes it.
CXXFLAGS set in the environment when configure was run is now honored
in the generated gdb/Makefile, and you can also override CXXFLAGS in
the command like at make time, with the usual 'make CXXFLAGS="..."'
Objects built with a C compiler (e.g., gnulib) still honor CFLAGS
instead.
gdb/ChangeLog:
2016-01-21 Pedro Alves <palves@redhat.com>
* Makefile.in (COMPILER_CFLAGS): New.
(CXXFLAGS): Get it from configure.
(INTERNAL_CFLAGS_BASE, INTERNAL_LDFLAGS): Use COMPILER_CFLAGS
instead of CFLAGS.
* build-with-cxx.m4 (GDB_AC_BUILD_WITH_CXX): Set and AC_SUBST
COMPILER_CFLAGS.
* configure: Regenerate.
gdb/gdbserver/ChangeLog:
2016-01-21 Pedro Alves <palves@redhat.com>
* Makefile.in (COMPILER_CFLAGS, CXXFLAGS): New.
(INTERNAL_CFLAGS_BASE): Use COMPILER_CFLAGS instead of CFLAGS.
* configure: Regenerate.
A relatively recent patch support for explicit locations, and part
of that patch cleaned up the way we parse breakpoint locations.
Unfortunatly, a small regression crept in for "*<EXPR>" breakpoint
locations. In particular, on PIE programs, one can see the issue by
doing the following, with any program:
(gdb) b *main
Breakpoint 1 at 0x51a: file hello.c, line 3.
(gdb) run
Starting program: /[...]/hello
Error in re-setting breakpoint 1: Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x51a
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x51a
Just for the record, this regression was introduced by:
commit a06efdd6ef
Date: Tue Aug 11 17:09:35 2015 -0700
Subject: Explicit locations: introduce address locations
What happens is that the patch makes the implicit assumption that
the address computed the first time is static, as if it was designed
to only support litteral expressions (Eg. "*0x1234"). This allows
the shortcut of not re-computing the breakpoint location's address
when re-setting breakpoints.
However, this does not work in general, as demonstrated in the example
above.
This patch plugs that hole simply by saving the original expression
used to compute the address as part of the address location, so as
to then re-evaluate that expression during breakpoint re-set.
gdb/ChangeLog:
* location.h (new_address_location): Add new parameters
"addr_string" and "addr_string_len".
(get_address_string_location): Add declaration.
* location.c (new_address_location): Add new parameters
"addr_string" and "addr_string_len". If not NULL, store
a copy of the addr_string in the new location as well.
(get_address_string_location): New function.
(string_to_event_location): Update call to new_address_location.
* linespec.c (event_location_to_sals) <ADDRESS_LOCATION>:
Save the event location in the parser's state before
passing it to convert_address_location_to_sals.
* breakpoint.c (create_thread_event_breakpoint): Update call
to new_address_location.
(init_breakpoint_sal): Get the event location's string, if any,
and use it to update call to new_address_location.
* python/py-finishbreakpoint.c (bpfinishpy_init):
Update call to new_address_location.
* spu-tdep.c (spu_catch_start): Likewise.
* config/djgpp/fnchange.lst: Add entries for
gdb/testsuite/gdb.base/break-fun-addr1.c and
gdb/testsuite/gdb.base/break-fun-addr2.c.
gdb/testsuite/ChangeLog:
* gdb.base/break-fun-addr.exp: New file.
* gdb.base/break-fun-addr1.c: New file.
* gdb.base/break-fun-addr2.c: New file.
This patch fixes the following regression introduced by commit d0e59a68
step^M
39 } /* handler */^M
1: x/i $pc^M
=> 0x8740 <handler+80>: sub sp, r11, #0^M
(gdb) step^M
^M
Program received signal SIGSEGV, Segmentation fault.^M
setitimer () at ../sysdeps/unix/syscall-template.S:81^M
81 ../sysdeps/unix/syscall-template.S: No such file or directory.^M
1: x/i $pc^M
=> 0xb6eff9c0 <setitimer>: push {r7}^M
(gdb) FAIL: gdb.base/sigstep.exp: continue to handler, si+advance in handler, step from handler: leave handler
in my test setting, program is compiled in arm mode, but the glibc
is built in thumb mode, so when we do 'step' to step over syscall
instruction svc for SIGRETURN, GDB should set breakpoint for arm mode
in the program, even though the current program in glibc is in thumb
mode. Current GDB doesn't consider the case that the mode of program
SIGRETURN goes to can be different from current program mode.
In fact, GDB has taken care of this arm/thumb mode changes already,
see
/* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
return 1. In addition, set IS_THUMB depending on whether we
will return to ARM or Thumb code. Return 0 if it is not a
rt_sigreturn/sigreturn syscall. */
static int
arm_linux_sigreturn_return_addr (struct frame_info *frame,
unsigned long svc_number,
CORE_ADDR *pc, int *is_thumb)
but in the commit d0e59a68
> - arm_linux_sigreturn_return_addr (frame, svc_number, &return_addr, &is_thumb);
> + if (svc_number == ARM_SIGRETURN || svc_number == ARM_RT_SIGRETURN)
> + next_pc = arm_linux_sigreturn_next_pc (regcache, svc_number);
the IS_THUMB setting is lost, so it is a regression.
gdb:
2016-01-21 Yao Qi <yao.qi@linaro.org>
* arm-linux-tdep.c (arm_linux_sigreturn_next_pc): Add parameter
is_thumb and set it according to CPSR saved on the stack.
(arm_linux_get_next_pcs_syscall_next_pc): Pass is_thumb to
arm_linux_sigreturn_next_pc.
gdb/gdbserver:
2016-01-21 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (arm_sigreturn_next_pc): Add parameter
is_thumb and set it according to CPSR saved on the stack.
(get_next_pcs_syscall_next_pc): Pass is_thumb to
arm_sigreturn_next_pc.
The lambda function used to sort the enumerator list does not work
properly. This list consists of tuples, (enum label, enum value). The
key function returns x.enumval. enumval not being defined for a tuple,
we see this exception in the test log:
Python Exception <class 'AttributeError'> 'tuple' object has no attribute 'enumval'
The function should return the second item of the tuple, which is the
enumval.
The pretty-printer still worked mostly correctly, except that the
enumeration values were not sorted. The test still passed because the
enumeration values are already sorted where they are defined. The test
also passed despite the exception being printed, because the right output
was printed after the exception:
print (enum flag_enum) (FLAG_1)
Python Exception <type 'exceptions.AttributeError'> 'tuple' objecthas no attribute 'enumval':M
$7 = 0x1 [FLAG_1]
(gdb) PASS: gdb.python/py-pp-maint.exp: print FLAG_1
New in v2:
- Improved test case, I stole Pedro's example directly. It verifies
that the sorting of enumerators by value works, by checking that
printing FOO_MASK appears as FOO_1 | FOO_2 | FOO_3.
I noticed that I could change the regexps to almost anything and the
tests would still pass. I think it was because of the | in there. I
made them more robust by using string_to_regexp. I used curly braces
{ } instead of quoting marks " " for strings, so that I could use
square brackets [ ] in them without having to escape them all. I also
removed the "message" part of the tests, since they are redundant with
the command, and it's just more maintenance to have to update them.
Tested with Python 2.7 and 3.5.
gdb/ChangeLog:
* python/lib/gdb/printing.py (FlagEnumerationPrinter.__call__):
Fix enumerators sort key function.
gdb/testsuite/ChangeLog:
* gdb.python/py-pp-maint.exp: Change/add enum flag tests.
* gdb.python/py-pp-maint.c (enum flag_enum): Use more complex
enum flag values.
(GNU Coding Standard...)
gdb/ChangeLog:
* printcmd.c (print_scalar_formatted): move binary operator from
end of line to beginning of next line. Adjust formatting
accordingly.
