Nowadays, GDBserver disables async io (by ignoring SIGIO) when process
a serial event, and enables async io (by installing signal handler) when
resume the inferior and wait. GDBserver may miss SIGIO (by interrupt)
and doesn't process SIGIO in time, which is shown by
gdb.base/interrupt-noterm.exp. In the test, GDB sends "continue &" and
then "interrupt". if '\003' arrives at a period between GDBserver
receives vCont;c and enables async io, SIGIO is ignored because signal
handler isn't installed. GDBserver waits for the inferior and can not
notice '\003' until it returns from wait.
This patch changes the code to install SIGIO handler early, but block
and unblock SIGIO as needed. In this way, we don't remove SIGIO
handler, so SIGIO can't be ignored. However, GDBserver needs to
remove the signal handler when connection is closed.
gdb/gdbserver:
2016-01-26 Yao Qi <yao.qi@linaro.org>
* remote-utils.c (remote_close) [!USE_WIN32API]: Ignore SIGIO.
(unblock_async_io): Rename to ...
(block_unblock_async_io): ... it. New function.
(enable_async_io): Don't install SIGIO handler. Unblock it
instead.
(disable_async_io): Don't ignore SIGIO. Block it instead.
(initialize_async_io): Install SIGIO handler. Don't call
unblock_async_io.
GDBserver may read some packet together with '\003' in one go. We've
already checked '\003' first when reading packet by my patch,
Check input interrupt first when reading packet
https://sourceware.org/ml/gdb-patches/2016-01/msg00057.html
but if we don't check '\003' *after* each packet, the interrupt will
be processed next time GDBserver reads from the buffer, so that the
interrupt isn't processed in time. For example, GDB sends vCont;c and
interrupt (see gdb.base/interrupt-noterm.exp), we'll resume the
inferior and wait once packet vCont;c is seen. If we don't check the
interrupt character after vCont;c packet, interrupt character will stay
in the buffer unattended until GDBserver returns from the wait, which
may take a while. Note that since we've read '\003' from file
descriptor, SIGIO signal handler input_interrupt doesn't help either.
This issue can be exposed by hacking the end of getpkt like
@@ -1041,6 +1050,9 @@ getpkt (char *buf)
}
}
+ if (readchar_bufcnt > 0)
+ gdb_assert (*readchar_bufp != '\003');
+
return bp - buf;
}
and this can trigger internal error,
(gdb) PASS: gdb.base/interrupt-noterm.exp: interrupt
Remote connection closed^M
(gdb) FAIL: gdb.base/interrupt-noterm.exp: inferior received SIGINT
Remote debugging from host 10.2.206.40^M
/home/yao/SourceCode/gnu/gdb/git/gdb/gdbserver/remote-utils.c:1054: A problem internal to GDBserver has been detected.^M
getpkt: Assertion `*readchar_bufp != '\003'' failed.^M
This patch is to peek the buffer, if it is '\003', consume it and call
*the_target->request_interrupt.
gdb/gdbserver:
2016-01-26 Yao Qi <yao.qi@linaro.org>
* remote-utils.c (getpkt): If the buffer isn't empty, and the
first character is '\003', call *the_target->request_interrupt.
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.
They were added by
PATCH: Multithreaded debugging for gdbserver
https://sourceware.org/ml/gdb-patches/2002-06/msg00157.html
but as a no-op, and the last usage of them was removed by
[gdbserver/RFC/RFA] Implement multiprocess extensions, add linux multiproces support.
https://sourceware.org/ml/gdb-patches/2009-03/msg00667.html
This patch is to remove them.
gdb/gdbserver:
2016-01-25 Yao Qi <yao.qi@linaro.org>
* remote-utils.c (new_thread_notify): Remove.
(dead_thread_notify): Likewise.
* remote-utils.h (new_thread_notify): Remove declaration.
(dead_thread_notify): Likewise.
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.
These two tests collect 64 words from $sp onwards, hoping that's enough
to capture a few whole stack frames. Unfortunately, that's not enough
for s390, which tends to have large frame sizes - minimum 24 words on
s390, 20 on s390x (which just barely passes). Bump it to 128 words,
let's hope no machine needs more.
Tested on x86_64, s390, s390x.
gdb/testsuite/ChangeLog:
* gdb.trace/backtrace.exp: Bump stack collection fudge factor.
* gdb.trace/entry-values.exp: Bump stack collection fudge factor.
The test constructs fake DWARF info for a C structure involving bitfields.
DWARF bitfields are always counted from LSB, while the order in which
bitfields are allocated in a C struct depends on the target endianness -
thus the generated DWARF marks different bitfields as unavailable when
target is big endian. Accordingly, we need different expected outputs.
Tested on s390 and s390x, no regression on x86_64.
gdb/testsuite/ChangeLog:
* gdb.trace/unavailable-dwarf-piece.exp: Fix bitfield handling on big
endian targets.
Missed one message in bd0a71fa16, since it
didn't trigger on s390x or amd64 (fast tracepoint out of range due to
shared library usage), noticed on s390.
Pushed as obvious.
gdb/testsuite/ChangeLog:
* gdb.trace/pending.exp: Fix expected message on continue.
Pedro Alves:
Looks like you forgot to amend before pushing though -- the version
checked in still had "Thread 1".
gdb/testsuite/ChangeLog
2016-01-22 Jan Kratochvil <jan.kratochvil@redhat.com>
Pedro Alves <palves@redhat.com>
Fix testsuite compatibility with Guile.
* gdb.gdb/selftest.exp (send ^C to child process): Drop expected Thread
number.
The PR threads/19422 patchset added a new regression.
Additionally below it there was already a regression if --with-guile (which is
default if Guile is found) was used.
racy case #1:
(xgdb) PASS: gdb.gdb/selftest.exp: Set xgdb_prompt
^M
Thread 1 "xgdb" received signal SIGINT, Interrupt.^M
0x00007ffff583bfdd in poll () from /lib64/libc.so.6^M
(gdb) FAIL: gdb.gdb/selftest.exp: send ^C to child process
signal SIGINT^M
Continuing with signal SIGINT.^M
^C^M
Thread 1 "xgdb" received signal SIGINT, Interrupt.^M
0x00007ffff5779da0 in sigprocmask () from /lib64/libc.so.6^M
(gdb) PASS: gdb.gdb/selftest.exp: send SIGINT signal to child process
backtrace^M
errstring=errstring@entry=0x7e0e6c "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240^M
errstring=errstring@entry=0x7e0e6c "", mask=mask@entry=RETURN_MASK_ALL) at exceptions.c:240^M
(gdb) PASS: gdb.gdb/selftest.exp: backtrace through signal handler
racy case #2:
(xgdb) PASS: gdb.gdb/selftest.exp: Set xgdb_prompt
^M
Thread 1 "xgdb" received signal SIGINT, Interrupt.^M
0x00007ffff583bfdd in poll () from /lib64/libc.so.6^M
(gdb) FAIL: gdb.gdb/selftest.exp: send ^C to child process
signal SIGINT^M
Continuing with signal SIGINT.^M
^C^M
Thread 2 "xgdb" received signal SIGINT, Interrupt.^M
[Switching to Thread 0x7ffff3b7f700 (LWP 13227)]^M
0x00007ffff6b88b10 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0^M
(gdb) PASS: gdb.gdb/selftest.exp: send SIGINT signal to child process
backtrace^M
(gdb) FAIL: gdb.gdb/selftest.exp: backtrace through signal handler
Pedro Alves:
Not all targets support thread names, and even those that do, not all
use the program name as default thread name -- I think that's only true
for GNU/Linux, actually. So I think it's best to not expect that, like:
-re "(Thread .*|Program) received signal SIGINT.*$gdb_prompt $" {
gdb/testsuite/ChangeLog
2016-01-22 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix testsuite compatibility with Guile.
* gdb.gdb/selftest.exp (send ^C to child process): Accept also Thread.
(thread 1): New test for backtrace through signal handler.
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.
Noticed and tested on 31-bit s390. This bug caused completely broken
fast tracepoints.
gdb/gdbserver/ChangeLog:
* tracepoint.c (write_inferior_data_ptr): Cast to uintptr_t, so that
it works properly on big-endian machines where sizeof (CORE_ADDR)
!= sizeof (void *).
This patch unbuffer the output of the program so that the test harness
can count the number of "done" from output correctly.
gdb/testsuite:
2016-01-22 Yao Qi <yao.qi@linaro.org>
PR testsuite/19491
* gdb.base/multi-forks.c: Include
../lib/unbuffer_output.c
(main): Call gdb_unbuffer_output.
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.
The gnu_vector test case yields a new FAIL on s390x:
FAIL: gdb.base/gnu_vector.exp: verify vector return value
It was introduced by commit 77ae9c1933 "gdb.base/gnu_vector.exp:
Don't test output from the inferior". That commit dropped the special
handling for GDB's inability (on some targets) to set the return value.
This change re-establishes the logic from before, converting the above
FAIL to a KFAIL (PRMS gdb/8549).
gdb/testsuite/ChangeLog:
* gdb.base/gnu_vector.exp: Re-establish handling for should_kfail
when GDB can not set the vector return value. Add more comments
for clarification.
On Ubuntu 14.04 the following failure would be seen when running the
tspeed.exp test on a target that supports fast tracepoints like x86_64:
Target returns error code '.In-process agent library not loaded in
process. Fast and static tracepoints unavailable.'.
(gdb) FAIL: gdb.trace/tspeed.exp: start trace experiment
This is because the default is to link with --as-needed and the
gdb_compile for the test is using the libs argument instead of shlib which
corrects this issue since 6ebea266fd by
adding -Wl,--no-as-needed.
This patch fixes the issue by passing the lib as the shlib argument to
gdb_compile.
Tested on Ubuntu 14.04 x86_64.
gdb/testsuite/ChangeLog:
* gdb.trace/tspeed.exp: Use shlib instead of libs in gdb_compile
command.
(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.
gdb/ChangeLog:
* fbsd-tdep.c (find_stop_signal): Remove.
(struct fbsd_collect_regset_section_cb) <lwp>: New field.
<stop_signal>: New field.
<abort_iteration>: New field.
(fbsd_collect_regset_section_cb): Use new fields.
(fbsd_collect_thread_registers): New function.
(struct fbsd_corefile_thread_data): New structure.
(fbsd_corefile_thread): New function.
(fbsd_make_corefile_notes): Use new function to dump notes for each
non-exited thread in a process.
Older versions of FreeBSD supported userland threading via a pure
user-space threading library (N threads scheduled on 1 process) and
a N:M model (N threads scheduled on M LWPs). However, modern FreeBSD
versions only support a M:M threading model where each user thread is
backed by a dedicated LWP. This thread target only supports this
threading model. It also uses ptrace to query and alter LWP state
directly rather than using libthread_db to simplify the implementation.
FreeBSD recently gained support for reporting LWP events (birth and death
of LWPs). GDB will use LWP events when present. For older systems it
fetches the list of LWPs in the to_update_thread_list target op to update
the list of threads on each stop.
This target supports scheduler locking by using ptrace to suspend
individual LWPs as necessary before resuming a process.
gdb/ChangeLog:
* configure.ac: Check for support for LWP names on FreeBSD.
* fbsd-nat.c [PT_LWPINFO] New variable debug_fbsd_lwp.
[TDP_RFPPWAIT || HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME]
(fbsd_fetch_kinfo_proc): Move function earlier.
[PT_LWPINFO] (fbsd_thread_alive): New function.
[PT_LWPINFO] (fbsd_pid_to_str): New function.
[HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME] (fbsd_thread_name): New function.
[PT_LWP_EVENTS] (fbsd_enable_lwp_events): New function.
[PT_LWPINFO] (fbsd_add_threads): New function.
[PT_LWPINFO] (fbsd_update_thread_list): New function.
[PT_LWPINFO] New variable super_resume.
[PT_LWPINFO] (resume_one_thread_cb): New function.
[PT_LWPINFO] (resume_all_threads_cb): New function.
[PT_LWPINFO] (fbsd_resume): New function.
(fbsd_remember_child): Save full ptid instead of plain pid.
(fbsd_is_child_pending): Return ptid of saved child process.
(fbsd_wait): Include lwp in returned ptid and switch to LWP ptid on
first stop.
[PT_LWP_EVENTS] Handle LWP events.
[TDP_RFPPWAIT] Include LWP in child ptid.
(fbsd_post_startup_inferior) [PT_LWP_EVENTS]: Enable LWP events.
(fbsd_post_attach) [PT_LWP_EVENTS]: Enable LWP events.
Add threads for existing processes.
(fbsd_nat_add_target) [PT_LWPINFO]: Set "to_thread_alive" to
"fbsd_thread_alive".
Set "to_pid_to_str" to "fbsd_pid_to_str".
[HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME]: Set "to_thread_name" to
"fbsd_thread_name".
[PT_LWPINFO]: Set "to_update_thread_list" to "fbsd_update_thread_list".
Set "to_has_thread_control" to "tc_schedlock".
Set "to_resume" to "fbsd_resume".
(_initialize_fbsd_nat): New function.
* configure: Regenerate.
* config.in: Regenerate.
gdb/doc/ChangeLog:
* gdb.texinfo (Debugging Output): Document "set/show debug fbsd-lwp".
This allows gdb to fetch per-thread registers for multi-threaded FreeBSD
processes.
Export get_ptrace_pid() from inf-ptrace.c and use it to determine the PID
to pass to ptrace in pan-BSD native targets. NetBSD and OpenBSD also accept
LWP IDs for ptrace requests to fetch per-thread state.
gdb/ChangeLog:
* amd64bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
get_ptrace_pid.
(amd64bsd_store_inferior_registers): Use get_ptrace_pid.
(amd64bsd_dr_get): Use get_ptrace_pid.
(amd64bsd_dr_set): Use get_ptrace_pid.
* i386bsd-nat.c (i386bsd_fetch_inferior_registers): Use get_ptrace_pid.
(i386bsd_store_inferior_registers): Use get_ptrace_pid.
(i386bsd_dr_get): Use get_ptrace_pid.
(i386bsd_dr_set): Use get_ptrace_pid.
* inf-ptrace.c (get_ptrace_pid): Export.
* inf-ptrace.h (get_ptrace_pid): Declare.
* ppcfbsd-nat.c (ppcfbsd_fetch_inferior_registers): Use lwp id.
(ppcfbsd_store_inferior_registers): Use lwp id.
Display the LWP ID of each thread in a FreeBSD core. Extract thread
names from the per-thread THRMISC note.
gdb/ChangeLog:
* fbsd_tdep.c (fbsd_core_pid_to_str): New function.
(fbsd_core_thread_name): New function.
(fbsd_init_abi): Add "core_pid_to_str" gdbarch method.
Add "core_thread_name" gdbarch method.
Add a new gdbarch method to extract a thread name from a core for a
given thread. Use this new method in core_thread_name to implement the
to_thread_name target op.
gdb/ChangeLog:
* corelow.c (core_thread_name): New function.
(init_core_ops): Use "core_thread_name" for the "to_thread_name"
target op.
* gdbarch.sh (core_thread_name): New gdbarch callback.
* gdbarch.h: Re-generate.
* gdbarch.c: Re-generate.
Using Python 3.5 (I assume it's the same with 3.4 and lower, but I didn't
test), I see this:
print (enum flag_enum) (FLAG_1)^M
Python Exception <class 'TypeError'> %x format: an integer is required, not gdb.Value: ^M
$7 = ^M
(gdb) FAIL: gdb.python/py-pp-maint.exp: print FLAG_1
Apparently, this idiom, where v is a gdb.Value, was possible with Python 2,
but not with Python 3:
'%x' % v
In Python 2, it would automatically get converted to an integer. To solve
it, I simply added wrapped v in a call to int().
'%x' % int(v)
In Python 2, the int type is implemented with a "long" in C, so on x86-32 it's
32-bits. I was worried that doing int(v) would truncate the value and give
wrong results for enum values > 32-bits. However, the int type != the int
function. The int function does the right thing, selecting the right integer
type for the given value. I tested with large enum values on x86-32 and
Python 2, and everything works as expected.
gdb/ChangeLog:
* python/lib/gdb/printing.py (_EnumInstance.to_string): Explicitly
convert gdb.Value to integer type using int().
By default, if a test driver (a test .exp) ends with an uncaught
error/exception, the runtest command will still have a return code of 0
(success). However, if a test (or the environment) is broken and does
not work properly, it should be considered as failed so that we can
notice it and fix it.
Passing the --status flag to runtest will make it return an error if one
of the test it runs ends up with an uncaught error.
gdb/testsuite/ChangeLog:
* Makefile.in (check-single): Pass --status to runtest.
(check/%.exp): Likewise.
When using the check-parallel target, the return code of make is always 0,
regardless of test results. This patch makes it return the same code as
the "make do-check-parallel" sub-command. So if there is a FAIL somewhere,
non-zero will be returned by make.
For the sake of example, I introduced a failure in gdb.base/break.exp.
$ make check-single TESTS="gdb.base/break.exp gdb.python/py-value.exp" && echo 'Success :D' || echo 'Fail :('
...
FAIL: gdb.base/break.exp: allo
...
Fail :(
I think the parallel run should do the same. Currently:
$ make check-parallel TESTS="gdb.base/break.exp gdb.python/py-value.exp" && echo 'Success :D' || echo 'Fail :('
...
FAIL: gdb.base/break.exp: allo
...
Success :D
And with the patch (no big surprises there):
$ make check-parallel TESTS="gdb.base/break.exp gdb.python/py-value.exp" && echo 'Success :D' || echo 'Fail :('
...
FAIL: gdb.base/break.exp: allo
...
Fail :(
What do you think?
gdb/testsuite/ChangeLog:
* Makefile.in (check-parallel): Propagate return code from make
do-check-parallel.
Include <sys/types.h> as a prerequisite for <machine/reg.h> when checking
for the r_fs and r_gs members in struct reg. Note that the previous test
for <machine/reg.h> already includes <sys/types.h> as a prerequisite.
gdb/ChangeLog:
* configure.ac: Include <sys/types.h when checking for "r_fs" in
"struct reg".
* configure: Regenerate.
Currently, we always re-set all locations of all breakpoints. This
commit makes us re-set only locations of the current program space.
If we loaded symbols to a program space (e.g., "file" command or some
shared library was loaded), GDB must run through all breakpoints and
determine if any new locations need to be added to the breakpoint.
However, there's no reason to recreate locations for _other_ program
spaces, as those haven't changed.
Similarly, when we create a new inferior, through e.g., a fork, GDB
must run through all breakpoints and determine if any new locations
need to be added to the breakpoint. There's no reason to destroy the
locations of the parent inferior and other inferiors. We know those
won't change.
In addition to being inneficient, resetting breakpoints of inferiors
that are currently running is problematic, because:
- some targets can't read memory while the inferior is running.
- the inferior might exit while we're re-setting its breakpoints,
which may confuse prologue skipping.
I went through all the places where we call breakpoint_re_set, and it
seems to me that all can be changed to only re-set locations of the
current program space.
The patch that reversed threads order in "info threads" etc. happened
to make gdb.threads/fork-plus-thread.exp expose this problem when
testing on x86/-m32. The problem was latent and masked out by chance
by the code-cache:
https://sourceware.org/ml/gdb-patches/2016-01/msg00213.html
Tested on x86-64 F20, native (-m64/-m32) and extended-remote
gdbserver.
Fixes the regression discussed in the url above with --target_board=unix/-m32:
-FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: inferior 1 exited
+PASS: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: inferior 1 exited
-FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: no threads left (timeout)
-FAIL: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: only inferior 1 left (the program exited)
+PASS: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: no threads left
+PASS: gdb.threads/fork-plus-threads.exp: detach-on-fork=off: only inferior 1 left
gdb/ChangeLog:
2016-01-19 Pedro Alves <palves@redhat.com>
* ax-gdb.c (agent_command_1): Adjust call to decode_line_full.
* break-catch-throw.c (re_set_exception_catchpoint): Pass the
current program space down to linespec decoding and breakpoint
location updating.
* breakpoint.c (parse_breakpoint_sals): Adjust calls to
decode_line_full.
(until_break_command): Adjust calls to decode_line_1.
(base_breakpoint_decode_location, bkpt_decode_location): Add
'search_pspace' parameter. Pass it along.
(bkpt_probe_create_sals_from_location): Adjust calls to
parse_probes.
(tracepoint_decode_location, tracepoint_probe_decode_location)
(strace_marker_decode_location): Add 'search_pspace' parameter.
Pass it along.
(all_locations_are_pending): Rewrite to take a breakpoint and
program space as arguments instead.
(hoist_existing_locations): New function.
(update_breakpoint_locations): Add 'filter_pspace' parameter. Use
hoist_existing_locations instead of always removing all locations,
and adjust to all_locations_are_pending change.
(location_to_sals): Add 'search_pspace' parameter. Pass it along.
Don't disable the breakpoint if there are other locations in
another program space.
(breakpoint_re_set_default): Adjust to pass down the current
program space as filter program space.
(decode_location_default): Add 'search_pspace' parameter and pass
it along.
(prepare_re_set_context): Don't switch program space here.
(breakpoint_re_set): Use save_current_space_and_thread instead of
save_current_program_space.
* breakpoint.h (struct breakpoint_ops) <decode_location>: Add
'search_pspace' parameter.
(update_breakpoint_locations): Add 'filter_pspace' parameter.
* cli/cli-cmds.c (edit_command, list_command): Adjust calls to
decode_line_1.
* elfread.c (elf_gnu_ifunc_resolver_return_stop): Pass the current
program space as filter program space.
* linespec.c (struct linespec_state) <search_pspace>: New field.
(create_sals_line_offset, convert_explicit_location_to_sals)
(parse_linespec): Pass the search program space down.
(linespec_state_constructor): Add 'search_pspace' parameter.
Store it.
(linespec_parser_new): Add 'search_pspace' parameter and pass it
along.
(linespec_lex_to_end): Adjust.
(decode_line_full, decode_line_1): Add 'search_pspace' parameter
and pass it along.
(decode_line_with_last_displayed): Adjust.
(collect_symtabs_from_filename, symtabs_from_filename): New
'search_pspace' parameter. Use it.
(find_function_symbols): Pass the search program space down.
* linespec.h (decode_line_1, decode_line_full): Add
'search_pspace' parameter.
* probe.c (parse_probes_in_pspace): New function, factored out
from ...
(parse_probes): ... this. Add 'search_pspace' parameter and use
it.
* probe.h (parse_probes): Add pspace' parameter.
* python/python.c (gdbpy_decode_line): Adjust.
* tracepoint.c (scope_info): Adjust.
This is fallout from f303dbd60d.
The testcases themselves are single-threaded, but they load the IPA library,
which injects a thread in the inferior - making them multithreaded.
This results in printing the thread numbers in breakpoint messages.
gdb/testsuite/ChangeLog:
* gdb.trace/ftrace.exp: Fix expected message on continue.
* gdb.trace/pending.exp: Fix expected message on continue.
* gdb.trace/trace-break.exp: Fix expected message on continue.
The POOL48A major opcode was defined in early revisions of the 64-bit
microMIPS ISA, has never been implemented, and was removed before the
64-bit microMIPS ISA specification[1] has been finalized.
This complements commit a6c7053929 ("MIPS/opcodes: Remove microMIPS
48-bit LI instruction").
References:
[1] "MIPS Architecture for Programmers, Volume II-B: The microMIPS64
Instruction Set", MIPS Technologies, Inc., Document Number: MD00594,
Revision 3.06, October 17, 2012, Table 6.2 "microMIPS64 Encoding of
Major Opcode Field", p. 578
gas/
* config/tc-mips.c (micromips_insn_length): Remove the mention
of 48-bit microMIPS instructions.
gdb/
* mips-tdep.c (mips_insn_size): Remove 48-bit microMIPS
instruction support.
(micromips_next_pc): Likewise.
(micromips_scan_prologue): Likewise.
(micromips_deal_with_atomic_sequence): Likewise.
(micromips_stack_frame_destroyed_p): Likewise.
(mips_breakpoint_from_pc): Likewise.
opcodes/
* mips-dis.c (print_insn_micromips): Remove 48-bit microMIPS
instruction support.
Fix a bug in `micromips_insn_at_pc_has_delay_slot' in instruction size
determination via `mips_insn_size'. In the microMIPS case the latter
function expects a lone 16-bit instruction word containing the major
opcode regardless of whether the opcode requires another 16-bit word to
follow, to form a complete 32-bit instruction. Code however passes the
16-bit word previously retrieved shifted left by 16 bits. Consequently
`mips_insn_size', which examines the low 16-bit only, always sees 0.
By pure coincidence a major opcode of 0 denotes a 32-bit instruction in
the microMIPS instruction set, so the size of 4 is always returned here,
and the following 16-bit word is then merged in the low 16 bits of the
instruction previously shifted by 16 bits. The resulting 32-bit value
is then passed to `micromips_instruction_has_delay_slot' for delay slot
presence determination. This function in turn first examines the high
16 bits of the instruction word received and ignores the low 16 bits for
16-bit instructions.
Consequently the only effect of this bug is an extraneous memory read
issued to retrieve a subsequent 16-bit word where a 16-bit instruction
is being examined. Which in turn may fail if the instruction is located
right at the end of a readable memory area, in which case the lack of a
delay slot will be reported to the caller, which may be incorrect.
This code is used in breakpoint maintenance, for delay slot avoidance,
so the bug would only trigger for the unlikely case of someone placing
a breakpoint in a delay slot of an instruction which is at the end of
readable memory. Which explains why the bug remained unnoticed so long.
gdb/
* mips-tdep.c (micromips_insn_at_pc_has_delay_slot): Pass
unshifted 16-bit microMIPS instruction word to `mips_insn_size'.
Those are unused since gdb_test_multiple was added, factoring out most
of the content of gdb_test.
gdb/testsuite/ChangeLog:
* lib/gdb.exp (gdb_test): Remove unused global references.
This commit changes GDB like this:
- Program received signal SIGINT, Interrupt.
+ Thread 1 "main" received signal SIGINT, Interrupt.
- Breakpoint 1 at 0x40087a: file threads.c, line 87.
+ Thread 3 "bar" hit Breakpoint 1 at 0x40087a: file threads.c, line 87.
... once the program goes multi-threaded. Until GDB sees a second
thread spawn, the output is still the same as before, per the
discussion back in 2012:
https://www.sourceware.org/ml/gdb/2012-11/msg00010.html
This helps non-stop mode, where you can't easily tell which thread hit
a breakpoint or received a signal:
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7ffff7fc1740 (LWP 19362) "main" (running)
2 Thread 0x7ffff7fc0700 (LWP 19366) "foo" (running)
3 Thread 0x7ffff77bf700 (LWP 19367) "bar" (running)
(gdb)
Program received signal SIGUSR1, User defined signal 1.
0x0000003616a09237 in pthread_join (threadid=140737353877248, thread_return=0x7fffffffd5b8) at pthread_join.c:92
92 lll_wait_tid (pd->tid);
(gdb) b threads.c:87
Breakpoint 1 at 0x40087a: file threads.c, line 87.
(gdb)
Breakpoint 1, thread_function1 (arg=0x1) at threads.c:87
87 usleep (1); /* Loop increment. */
The best the user can do is run "info threads" and try to figure
things out.
It actually also affects all-stop mode, in case of "handle SIG print
nostop":
...
Program received signal SIGUSR1, User defined signal 1.
Program received signal SIGUSR1, User defined signal 1.
Program received signal SIGUSR1, User defined signal 1.
Program received signal SIGUSR1, User defined signal 1.
...
The above doesn't give any clue that these were different threads
getting the SIGUSR1 signal.
I initially thought of lowercasing "breakpoint" in
"Thread 3 hit Breakpoint 1"
but then after trying it I realized that leaving "Breakpoint"
uppercase helps the eye quickly find the relevant information. It's
also easier to implement not showing anything about threads until the
program goes multi-threaded this way.
Here's a larger example session in non-stop mode:
(gdb) c -a&
Continuing.
(gdb) interrupt -a
(gdb)
Thread 1 "main" stopped.
0x0000003616a09237 in pthread_join (threadid=140737353877248, thread_return=0x7fffffffd5b8) at pthread_join.c:92
92 lll_wait_tid (pd->tid);
Thread 2 "foo" stopped.
0x0000003615ebc6ed in nanosleep () at ../sysdeps/unix/syscall-template.S:81
81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
Thread 3 "bar" stopped.
0x0000003615ebc6ed in nanosleep () at ../sysdeps/unix/syscall-template.S:81
81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
b threads.c:87
Breakpoint 4 at 0x40087a: file threads.c, line 87.
(gdb) b threads.c:67
Breakpoint 5 at 0x400811: file threads.c, line 67.
(gdb) c -a&
Continuing.
(gdb)
Thread 3 "bar" hit Breakpoint 4, thread_function1 (arg=0x1) at threads.c:87
87 usleep (1); /* Loop increment. */
Thread 2 "foo" hit Breakpoint 5, thread_function0 (arg=0x0) at threads.c:68
68 (*myp) ++;
info threads
Id Target Id Frame
* 1 Thread 0x7ffff7fc1740 (LWP 31957) "main" (running)
2 Thread 0x7ffff7fc0700 (LWP 31961) "foo" thread_function0 (arg=0x0) at threads.c:68
3 Thread 0x7ffff77bf700 (LWP 31962) "bar" thread_function1 (arg=0x1) at threads.c:87
(gdb) shell kill -SIGINT 31957
(gdb)
Thread 1 "main" received signal SIGINT, Interrupt.
0x0000003616a09237 in pthread_join (threadid=140737353877248, thread_return=0x7fffffffd5b8) at pthread_join.c:92
92 lll_wait_tid (pd->tid);
info threads
Id Target Id Frame
* 1 Thread 0x7ffff7fc1740 (LWP 31957) "main" 0x0000003616a09237 in pthread_join (threadid=140737353877248, thread_return=0x7fffffffd5b8) at pthread_join.c:92
2 Thread 0x7ffff7fc0700 (LWP 31961) "foo" thread_function0 (arg=0x0) at threads.c:68
3 Thread 0x7ffff77bf700 (LWP 31962) "bar" thread_function1 (arg=0x1) at threads.c:87
(gdb) t 2
[Switching to thread 2, Thread 0x7ffff7fc0700 (LWP 31961)]
#0 thread_function0 (arg=0x0) at threads.c:68
68 (*myp) ++;
(gdb) catch syscall
Catchpoint 6 (any syscall)
(gdb) c&
Continuing.
(gdb)
Thread 2 "foo" hit Catchpoint 6 (call to syscall nanosleep), 0x0000003615ebc6ed in nanosleep () at ../sysdeps/unix/syscall-template.S:81
81 T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
I'll work on documentation next if this looks agreeable.
This patch applies on top of the star wildcards thread IDs series:
https://sourceware.org/ml/gdb-patches/2016-01/msg00291.html
For convenience, I've pushed this to the
users/palves/show-which-thread-caused-stop branch.
gdb/doc/ChangeLog:
2016-01-18 Pedro Alves <palves@redhat.com>
* gdb.texinfo (Threads): Mention that GDB displays the ID and name
of the thread that hit a breakpoint or received a signal.
gdb/ChangeLog:
2016-01-18 Pedro Alves <palves@redhat.com>
* NEWS: Mention that GDB now displays the ID and name of the
thread that hit a breakpoint or received a signal.
* break-catch-sig.c (signal_catchpoint_print_it): Use
maybe_print_thread_hit_breakpoint.
* break-catch-syscall.c (print_it_catch_syscall): Likewise.
* break-catch-throw.c (print_it_exception_catchpoint): Likewise.
* breakpoint.c (maybe_print_thread_hit_breakpoint): New function.
(print_it_catch_fork, print_it_catch_vfork, print_it_catch_solib)
(print_it_catch_exec, print_it_ranged_breakpoint)
(print_it_watchpoint, print_it_masked_watchpoint, bkpt_print_it):
Use maybe_print_thread_hit_breakpoint.
* breakpoint.h (maybe_print_thread_hit_breakpoint): Declare.
* gdbthread.h (show_thread_that_caused_stop): Declare.
* infrun.c (print_signal_received_reason): Print which thread
received signal.
* thread.c (show_thread_that_caused_stop): New function.
gdb/testsuite/ChangeLog:
2016-01-18 Pedro Alves <palves@redhat.com>
* gdb.base/async-shell.exp: Adjust expected output.
* gdb.base/dprintf-non-stop.exp: Adjust expected output.
* gdb.base/siginfo-thread.exp: Adjust expected output.
* gdb.base/watchpoint-hw-hit-once.exp: Adjust expected output.
* gdb.java/jnpe.exp: Adjust expected output.
* gdb.threads/clone-new-thread-event.exp: Adjust expected output.
* gdb.threads/continue-pending-status.exp: Adjust expected output.
* gdb.threads/leader-exit.exp: Adjust expected output.
* gdb.threads/manythreads.exp: Adjust expected output.
* gdb.threads/pthreads.exp: Adjust expected output.
* gdb.threads/schedlock.exp: Adjust expected output.
* gdb.threads/siginfo-threads.exp: Adjust expected output.
* gdb.threads/signal-command-multiple-signals-pending.exp: Adjust
expected output.
* gdb.threads/signal-delivered-right-thread.exp: Adjust expected
output.
* gdb.threads/sigthread.exp: Adjust expected output.
* gdb.threads/watchpoint-fork.exp: Adjust expected output.
This patch is the follow-up of
https://sourceware.org/ml/gdb-patches/2016-01/msg00164.html to provide
linux_{get,set}_pc_64bit functions.
Rebuild GDBserver with tilegx-linux-gcc. Not tested.
I think about pc in Tile-GX a little bit. Looks current Tile-GX
supports debugging 32-bit program (multi-arch), but PC is always
64-bit. See this thread
https://sourceware.org/ml/gdb-patches/2013-02/msg00113.html
and GDBserver reads PC as 64-bit through ptrace. However, if
the inferior is 32-bit, the PC in the target description and
regcache is 32-bit, so only 32-bit contents are sent back GDB.
Anyway, Tile-GX GDBserver may have some problems here, but this
patch doesn't change anything.
gdb/gdbserver:
2016-01-18 Yao Qi <yao.qi@linaro.org>
* linux-low.c (linux_set_pc_64bit): New function.
(linux_get_pc_64bit): New function.
* linux-low.h (linux_set_pc_64bit, linux_get_pc_64bit):
Declare.
* linux-sparc-low.c (debug_threads): Remove declaration.
(sparc_get_pc): Remove.
(the_low_target): Use linux_get_pc_64bit instead of
sparc_get_pc.
* linux-tile-low.c (tile_get_pc, tile_set_pc): Remove.
(the_low_target): Use linux_get_pc_64bit and
linux_set_pc_64bit.
This patch adds a pair of new functions linux_get_pc_32bit and
linux_set_pc_32bit which get and set 32-bit register "pc" from
regcache. This function can be used some targets and these own
$ARCH_{get,set}_pc are replaced by linux_{get,set}_pc_32bit
respectively.
This patch touches many targets, but I only have arm board to
test and no regression. I also rebuilt nios2-linux GDBserver.
If it is right to go, I'll post the 64-bit counterpart later.
gdb/gdbserver:
2016-01-18 Yao Qi <yao.qi@linaro.org>
* linux-arm-low.c (debug_threads): Remove declaration.
(arm_get_pc, arm_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-bfin-low.c (bfin_get_pc, bfin_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-cris-low.c (debug_threads): Remove declaration.
(cris_get_pc, cris_set_pc,): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-crisv32-low.c (debug_threads): Remove declaration.
(cris_get_pc, cris_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-low.c: Include inttypes.h.
(linux_get_pc_32bit, linux_set_pc_32bit): New functions.
* linux-low.h (linux_get_pc_32bit, linux_set_pc_32bit): Declare.
* linux-m32r-low.c (m32r_get_pc, m32r_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-m68k-low.c (m68k_get_pc, m68k_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-nios2-low.c (nios2_get_pc, nios2_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-sh-low.c (sh_get_pc, sh_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
* linux-xtensa-low.c (xtensa_get_pc, xtensa_set_pc): Remove.
(the_low_target): Use linux_get_pc_32bit and
linux_set_pc_32bit.
