I noticed that gdb.multi/multi-arch.exp wasn't passing with
extended-remote GDBserver with my pending multi-process+multi-arch
series anymore on current mainline, while it used to pass before:
(gdb) run
Starting program: /home/pedro/gdb/mygit/build/gdb/testsuite/gdb.multi/ma-hangout
Process /home/pedro/gdb/mygit/build/gdb/testsuite/gdb.multi/ma-hangout created; pid = 32067
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
Cannot insert breakpoint -1.
Temporarily disabling shared library breakpoints:
breakpoint #-1
(gdb) FAIL: gdb.multi/multi-arch.exp: starting inferior 2
Investigating manually, I found an easy way to reproduce. You just
need breakpoints on distinct inferiors, and a way to have GDB install
them in one go:
(gdb) set breakpoint always-inserted on
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint del n <MULTIPLE>
2.1 y 0x00000000004005c2 in main at ../../../src/gdb/testsuite/gdb.multi/hello.c:40 inf 1
2.2 y 0x08048475 in main at ../../../src/gdb/testsuite/gdb.multi/hangout.c:22 inf 2
(gdb) enable 2
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
And turning on remote debugging, we see:
(gdb) set debug remote 1
(gdb) disable 2
(gdb) enable 2
Sending packet: $Z0,4005c2,1#71...Packet received: E01
Sending packet: $Z0,8048475,1#87...Packet received: OK
Warning:
Cannot insert breakpoint 2.
Error accessing memory address 0x4005c2: Unknown error -1.
Notice that each of those Z0 breakpoints should be set in different
processes. However, no Hg packet to select a process has been sent in
between, so GDBserver tries to plant both on the same process that
happens to be current. The first Z0 then not so surprisingly fails.
IOW, the blame is on GDB, for telling GDBserver to plant both
breakpoints in the same process.
remote.c has a lazy scheme where it keeps a local cache of the
remote's selected general thread, and delays updating it on the remote
side until necessary (memory/register reads/writes, etc.). This is
done to reduce RSP traffic. The bug is that the Zx breakpoint
insert/remove methods weren't committing the selected thread/process
back to the remote side:
Breakpoint 3, remote_insert_breakpoint (gdbarch=0x1383ae0, bp_tgt=0x140c2b0) at ../../src/gdb/remote.c:8148
8148 if (remote_protocol_packets[PACKET_Z0].support != PACKET_DISABLE)
(top-gdb) p inferior_ptid
$3 = {pid = 3670, lwp = 0, tid = 3670}
(top-gdb) p general_thread
$4 = {pid = 3671, lwp = 0, tid = 3671}
IOW, a call to set_general_process is missing.
I did some auditing over remote.c, and added calls to all places I
found missing it.
This only used to work by chance before. breakpoint.c switches to a
thread of the target process before installing a breakpoint location.
That calls switch_to_thread. Before:
2012-07-27 Yao Qi <yao@codesourcery.com>
* thread.c (switch_to_thread): Don't call registers_changed.
that caused the register caches to all be flushed and refetched before
installing the breakpoint location. Given fetching registers commits
the remote general thread (with Hg), masking out the latent bug.
Tested on x86_64 Fedora 17 with GDBserver.
gdb/
2013-05-29 Pedro Alves <palves@redhat.com>
* remote.c (remote_insert_breakpoint, remote_remove_breakpoint)
(remote_insert_watchpoint, remote_remove_watchpoint)
(remote_insert_hw_breakpoint, remote_remove_hw_breakpoint)
(remote_verify_memory, compare_sections_command)
(remote_search_memory): Set the general process/thread on the
remote side.
This patch teaches GDB to take advantage of target-assisted range
stepping. It adds a new 'r ADDR1,ADDR2' action to vCont (vCont;r),
meaning, "step once, and keep stepping as long as the thread is in the
[ADDR1,ADDR2) range".
Rationale:
When user issues the "step" command on the following line of source,
a = b + c + d * e - a;
GDB single-steps every single instruction until the program reaches a
new different line. E.g., on x86_64, that line compiles to:
0x08048434 <+65>: mov 0x1c(%esp),%eax
0x08048438 <+69>: mov 0x30(%esp),%edx
0x0804843c <+73>: add %eax,%edx
0x0804843e <+75>: mov 0x18(%esp),%eax
0x08048442 <+79>: imul 0x2c(%esp),%eax
0x08048447 <+84>: add %edx,%eax
0x08048449 <+86>: sub 0x34(%esp),%eax
0x0804844d <+90>: mov %eax,0x34(%esp)
0x08048451 <+94>: mov 0x1c(%esp),%eax
and the following is the RSP traffic between GDB and GDBserver:
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:3c840408;thread:p2e13.2e13;core:1;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:3e840408;thread:p2e13.2e13;core:2;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:42840408;thread:p2e13.2e13;core:2;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:47840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:49840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:4d840408;thread:p2e13.2e13;core:0;
--> vCont;s:p2e13.2e13;c
<-- T0505:68efffbf;04:30efffbf;08:51840408;thread:p2e13.2e13;core:0;
IOW, a lot of roundtrips between GDB and GDBserver.
If we add a new command to the RSP, meaning "keep stepping and don't
report a stop until the program goes out of the [0x08048434,
0x08048451) address range", then the RSP traffic can be reduced down
to:
--> vCont;r8048434,8048451:p2db0.2db0;c
<-- T0505:68efffbf;04:30efffbf;08:51840408;thread:p2db0.2db0;core:1;
As number of packets is reduced dramatically, the performance of
stepping source lines is much improved.
In case something is wrong with range stepping on the stub side, the
debug info or even gdb, this adds a "set/show range-stepping" command
to be able to turn range stepping off.
gdb/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* gdbthread.h (struct thread_control_state) <may_range_step>: New
field.
* infcmd.c (step_once, until_next_command): Enable range stepping.
* infrun.c (displaced_step_prepare): Disable range stepping.
(resume): Disable range stepping if stepping over a breakpoint or
we have software watchpoints. If range stepping is enabled,
assert the thread is in the stepping range.
(clear_proceed_status_thread): Clear may_range_step.
(handle_inferior_event): Disable range stepping as soon as we know
the thread that hit the event. Re-enable it whenever we're going
to step with a step range.
* remote.c (struct vCont_action_support) <r>: New field.
(use_range_stepping): New global.
(remote_vcont_probe): Handle 'r' action.
(append_resumption): Append an 'r' action if the thread may range
step.
(show_range_stepping): New function.
(set_range_stepping): New function.
(_initialize_remote): Call add_setshow_boolean_cmd to register the
'set range-stepping' and 'show range-stepping' commands.
* NEWS: Mention range stepping, the new vCont;r action, and the
new "set/show range-stepping" commands.
gdb/doc/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* gdb.texinfo (Packets): Document 'vCont;r'.
(Continuing and Stepping): Document target-assisted range
stepping, and the 'set range-stepping' and 'show range-stepping'
commands.
Convert the 'support_vCont_t' int field to a struct, in preparation
for adding more fields to it.
gdb/
2013-05-23 Yao Qi <yao@codesourcery.com>
Pedro Alves <palves@redhat.com>
* remote.c (struct vCont_action_support): New struct.
(struct remote_state) <support_vCont_t>: Remove field.
<vCont_actions_support>: New field.
(remote_vcont_probe, remote_stop_ns): Update.
I noticed:
(gdb) show remote traceframe-info-packet
Support for the `qXfer:trace-frame-info:read' packet is auto-detected, currently unknown.
^^^^^^^^^^^
The packet is actually qXfer:traceframe-info:read.
gdb/
2013-05-10 Pedro Alves <palves@redhat.com>
* remote.c (_initialize_remote): Fix spelling of
qXfer:traceframe-info:read packet in packet config command.
In the function remote_trace_set_readonly_regions in gdb/remote.c, the
local variable 'offset' does not account for "QTro" at the start of
the packet with the result that if there are any read-only regions,
the packet is sent -- but without the "QTro" -- causing the remote
stub to report that the packet is unsupported:
Sending packet: $:0000000000400200,(...),00000000004560a4#ab...Packet received:
vs the expected:
Sending packet: $QTro:0000000000400200,(...),00000000004560a4#31...Packet received: OK
We don't see the problem when testing with GDBserver, as that supports
qXfer:trace-frame-info:read, meaning GDBserver never needs to read
from the read-only sections directly itself. This commit adds a test
that explicitly disables qXfer:trace-frame-info:read.
gdb/
2013-05-10 David Taylor <dtaylor@emc.com>
PR remote/15455
* remote.c (remote_trace_set_readonly_regions): Do not overwrite
"QTro" at start of packet.
gdb/testsuite/
2013-05-10 Pedro Alves <palves@redhat.com>
PR remote/15455
* gdb.trace/qtro.c: New file.
* gdb.trace/qtro.exp: New file.
While the RSP is largely ASCII based (hence the packet buffer type is
char *), at places we pass around 8-bit binary packets in that buffer.
Functions like hex2bin or remote_escape_output conceptually are
handling binary buffers, so I left them as working with gdb_byte, and
added casts where necessary. Whether these are host bytes or target
bytes is blurry at present, so this is largely a matter of taste.
Switching some of these functions to take "char *" or "void *" would
be equally good.
gdb/
2013-04-19 Pedro Alves <palves@redhat.com>
* remote.c (remote_write_bytes_aux, compare_sections_command)
(remote_read_qxfer)
(remote_search_memory, remote_hostio_pwrite, remote_hostio_pread)
(remote_hostio_readlink, remote_bfd_iovec_pread)
(remote_set_trace_notes): Use gdb_byte when RSP buffer is used as
binary buffer, and char when buffer is used as string.
* tracepoint.c (encode_source_string, tfile_write_uploaded_tp)
(trace_save, tfile_open, traceframe_walk_blocks)
(tfile_fetch_registers): Likewise.
-Wpointer-sign catches all these cases across the codebase that should
be using gdb_byte for raw target bytes. I think these are all
obvious, hence I've collapsed into a single patch.
gdb/
2013-04-19 Pedro Alves <palves@redhat.com>
* aarch64-tdep.c (aarch64_default_breakpoint): Change type to
gdb_byte[].
(aarch64_breakpoint_from_pc): Change return type to gdb_byte *.
* ada-lang.c (ada_value_assign): Use gdb_byte.
* alphanbsd-tdep.c (sigtramp_retcode): Change type to gdb_byte[].
(alphanbsd_sigtramp_offset): Use gdb_byte.
* arm-linux-tdep.c (arm_linux_arm_le_breakpoint)
(arm_linux_arm_be_breakpoint, eabi_linux_arm_le_breakpoint)
(eabi_linux_arm_be_breakpoint, arm_linux_thumb_be_breakpoint)
(arm_linux_thumb_le_breakpoint, arm_linux_thumb2_be_breakpoint)
(arm_linux_thumb2_le_breakpoint): Change type to gdb_byte[].
* arm-tdep.c (arm_stub_unwind_sniffer)
(arm_displaced_init_closure): Use gdb_byte.
(arm_default_arm_le_breakpoint, arm_default_arm_be_breakpoint)
(arm_default_thumb_le_breakpoint)
(arm_default_thumb_be_breakpoint): Change type to gdb_byte[].
* arm-tdep.h (struct gdbarch_tdep) <arm_breakpoint,
thumb_breakpoint, thumb2_breakpoint>: Change type to gdb_byte *.
* arm-wince-tdep.c (arm_wince_le_breakpoint)
(arm_wince_thumb_le_breakpoint): Change type to gdb_byte[].
* armnbsd-tdep.c (arm_nbsd_arm_le_breakpoint)
(arm_nbsd_arm_be_breakpoint, arm_nbsd_thumb_le_breakpoint)
(arm_nbsd_thumb_be_breakpoint): Change type to gdb_byte[].
* armobsd-tdep.c (arm_obsd_thumb_le_breakpoint)
(arm_obsd_thumb_be_breakpoint): Change type to gdb_byte[].
* cris-tdep.c (push_stack_item, cris_push_dummy_call)
(cris_store_return_value, cris_extract_return_value): Use
gdb_byte.
(constraint): Change type of parameter to char * from signed
char*. Use gdb_byte.
* dwarf2loc.c (read_pieced_value, write_pieced_value): Change type
of local buffer to gdb_byte *.
* dwarf2read.c (read_index_from_section): Use gdb_byte.
(create_dwp_hash_table): Change type of locals to gdb_byte *.
(add_address_entry): Change type of local buffer to gdb_byte[].
* frv-tdep.c (frv_adjust_breakpoint_address, find_func_descr)
(frv_push_dummy_call): Use gdb_byte.
* hppa-hpux-tdep.c (hppa_hpux_push_dummy_code)
(hppa_hpux_supply_ss_fpblock, hppa_hpux_supply_ss_wide)
(hppa_hpux_supply_save_state): Use gdb_byte.
* hppa-tdep.c (hppa32_push_dummy_call)
(hppa64_convert_code_addr_to_fptr): Use gdb_byte.
* ia64-tdep.c (extract_bit_field, replace_bit_field)
(slotN_contents, replace_slotN_contents): Change type of parameter
to gdb_byte *.
(fetch_instruction, ia64_pseudo_register_write)
(ia64_register_to_value, ia64_value_to_register)
(ia64_extract_return_value, ia64_store_return_value)
(ia64_push_dummy_call): Use gdb_byte.
* m32c-tdep.c (m32c_return_value): Remove cast.
* m68hc11-tdep.c (m68hc11_pseudo_register_write)
(m68hc11_push_dummy_call, m68hc11_store_return_value): Use
gdb_byte.
* mipsnbsd-tdep.c (mipsnbsd_get_longjmp_target): Use gdb_byte.
* mn10300-tdep.c (mn10300_store_return_value)
(mn10300_breakpoint_from_pc, mn10300_push_dummy_call): Use
gdb_byte.
* moxie-tdep.c (moxie_process_readu): Use gdb_byte.
(moxie_process_record): Remove casts.
* ppc-ravenscar-thread.c (supply_register_at_address)
(ppc_ravenscar_generic_store_registers): Use gdb_byte.
* ravenscar-thread.c (get_running_thread_id): Use gdb_byte.
* remote-m32r-sdi.c (m32r_fetch_register): Use gdb_byte.
* remote-mips.c (mips_xfer_memory): Use gdb_byte.
* remote.c (compare_sections_command): Use gdb_byte.
* score-tdep.c (score7_free_memblock): Change type of parameter to
gdb_byte *.
* sh-tdep.c (sh_justify_value_in_reg): Change return type to
gdb_byte *. Use gdb_byte.
(sh_push_dummy_call_fpu): Use gdb_byte.
(sh_extract_return_value_nofpu, sh_extract_return_value_fpu)
(sh_store_return_value_nofpu, sh_store_return_value_fpu)
(sh_register_convert_to_virtual, sh_register_convert_to_raw):
Change parameter type to 'gdb_byte *'. Use gdb_byte.
(sh_pseudo_register_read, sh_pseudo_register_write): Use gdb_byte.
* sh64-tdep.c (sh64_push_dummy_call): Use gdb_byte.
(sh64_store_return_value, sh64_register_convert_to_virtual):
Change parameter type to 'gdb_byte *'. Use gdb_byte.
(sh64_pseudo_register_write): Use gdb_byte.
* solib-darwin.c (darwin_current_sos): Add casts to 'gdb_byte *'.
* solib-irix.c (fetch_lm_info): Likewise. Use gdb_byte for byte
buffer.
(irix_current_sos): Use gdb_byte.
* solib-som.c (som_current_sos): Use gdb_byte.
* sparc-ravenscar-thread.c (supply_register_at_address)
(sparc_ravenscar_generic_store_registers): Use gdb_byte.
* spu-multiarch.c (spu_xfer_partial): Add cast to 'char *'.
* spu-tdep.c (spu_get_overlay_table): Use gdb_byte.
* tic6x-tdep.c (tic6x_breakpoint_from_pc): Change return type to
'gdb_byte *'.
* tic6x-tdep.h (struct gdbarch_tdep) <breakpoint>: Change type to
'gdb_byte *'.
* tracepoint.c (tfile_fetch_registers): Use gdb_byte.
* xstormy16-tdep.c (xstormy16_extract_return_value)
(xstormy16_store_return_value): Change parameter type to
'gdb_byte *'. Adjust.
(xstormy16_push_dummy_call): Use gdb_byte.
* xtensa-tdep.c (xtensa_scan_prologue, call0_ret)
(call0_analyze_prologue, execute_code): Use gdb_byte.
The current throw_perror_with_name/TARGET_CLOSE_ERROR calls assume
errno is still set to the right error, although remote_unpush_target
is called in between, which may well change errno.
Tested on x86_64 Fedora 17 w/ gdbserver.
gdb/
2013-04-09 Pedro Alves <palves@redhat.com>
* remote.c (unpush_and_perror): New function.
(readchar, remote_serial_write): Use it.
* remote.c (remote_trace_find): Change type of parameters 'addr1'
and 'addr2' to CORE_ADDR.
* target.c (update_current_target): Update.
* target.h (struct target_ops) <to_trace_find>: Change parameter
type to CORE_ADDR.
* tracepoint.c (tfind_1): Change type of parameters 'addr1' and
'addr2' to CORE_ADDR.
(tfile_trace_find): Likewise.
(tfile_get_traceframe_address): Change return type to CORE_ADDR.
Change local variable 'addr' to type CORE_ADDR.
* tracepoint.h (tfind_1): Update declaration.
PR gdb/15275 notes that when debugging with a remote connection over a
serial link and the link is disconnected, say by disconnecting USB
serial port, the GDB quit command no longer works:
(gdb)
tar ext /dev/ttyACM0
&"tar ext /dev/ttyACM0\n"
~"Remote debugging using /dev/ttyACM0\n"
^done
(gdb)
set debug remote 1
&"set debug remote 1\n"
^done
(gdb)
quit
&"quit\n"
&"Sending packet: $qTStatus#49..."
&"putpkt: write failed: Input/output error.\n"
^error,msg="putpkt: write failed: Input/output error."
(gdb)
(gdb)
quit
&"quit\n"
&"Sending packet: $qTStatus#49..."
&"putpkt: write failed: Input/output error.\n"
^error,msg="putpkt: write failed: Input/output error."
This is not reproducible with TCP connections, as with that, sending
doesn't error out, but instead the error is detected on the subsequent
readchar. When that read fails, we unpush the remote target, and
throw TARGET_CLOSE_ERROR. To address PR gdb/15275, instead of
catching the error in remote_get_trace_status as presently done (which
leaves this same issue latent for another packet to trip on), or of
making ser-unix.c fake success too on failed writes, so we'd get to
readchar detecting the error on serial ports too, better let the error
propagate out of serial_write, and catch it at the remote.c level,
throwing away the target if writing fails too, instead of delaying
that until the next read.
gdb/
2013-04-02 Pedro Alves <palves@redhat.com>
PR gdb/15275
* remote.c (send_interrupt_sequence): Use remote_serial_write.
(remote_serial_write): New function.
(putpkt_binary, getpkt_or_notif_sane_1): Use remote_serial_write.
GDB currently sends a qTStatus even if the target previously replied
an empty packet to a previous qTStatus. If the target doesn't
recognize the packet, there's no point in trying again.
The machinery we have in place is packet_ok, which has the nice side
effect of forcing one to install a configuration command/knob for the
packet in question, which is often handy when you need to debug
things, and/or emulate a target that doesn't support the packet, or even,
it can be used as workaround for the old broken kgdb's that return error
to qTSTatus instead of an empty packet.
gdb/
2013-03-28 Pedro Alves <palves@redhat.com>
* NEWS (New options): New section.
(New options): Mention set/show remote trace-status-packet.
* remote.c (PACKET_qTStatus): New enumeration value.
(remote_get_trace_status): Skip sending qTStatus if the packet is
disabled. Use packet_ok.
(_initialize_remote): Register a configuration command for
qTStatus packet.
gdb/doc/
2013-03-28 Pedro Alves <palves@redhat.com>
* gdb.texinfo (Remote Configuration) <set remote @var{name}-packet
table>: Add entry for "trace-status".
It makes no sense to talk about an "unlimited" address size in this
context.
(gdb) show remoteaddresssize
The maximum size of the address (in bits) in a memory packet is 0.
(gdb) set remoteaddresssize 0
(gdb) show remoteaddresssize
The maximum size of the address (in bits) in a memory packet is unlimited.
"set remoteaddresssize 0" mapping to UINT_MAX means you can't
force gdb through this path twice in the same GDB run:
static CORE_ADDR
remote_address_masked (CORE_ADDR addr)
{
unsigned int address_size = remote_address_size;
/* If "remoteaddresssize" was not set, default to target address size. */
if (!address_size)
address_size = gdbarch_addr_bit (target_gdbarch ());
gdb/
2013-03-26 Pedro Alves <palves@redhat.com>
* remote.c (_initialize_remote): Make "set remoteaddresssize"
a zuinteger command instead of uinteger.
* exceptions.h (enum errors): New entry TARGET_CLOSE_ERROR.
* remote.c (trace_error): Remove the special handling of '2'.
(readchar) <SERIAL_EOF>
(readchar) <SERIAL_ERROR>
(getpkt_or_notif_sane_1): Use TARGET_CLOSE_ERROR for them.
(remote_get_trace_status): Call throw_exception if EX is
TARGET_CLOSE_ERROR.
* utils.c (perror_with_name): Rename to ...
(throw_perror_with_name): ... here. New parameter errcode, describe it
in the function comment.
(perror_with_name): New function wrapper.
* utils.h (enum errors): New stub declaration.
(throw_perror_with_name): New declaration.
gdb/testsuite/
* gdb.server/server-kill.c: New file.
* gdb.server/server-kill.exp: New file.
This is sort of a continuation of Keith's parse_exp_1 constification
patch. It started out by undoing these bits:
@@ -754,9 +754,12 @@ validate_actionline (char **line, struct
tmp_p = p;
for (loc = t->base.loc; loc; loc = loc->next)
{
- p = tmp_p;
- exp = parse_exp_1 (&p, loc->address,
+ const char *q;
+
+ q = tmp_p;
+ exp = parse_exp_1 (&q, loc->address,
block_for_pc (loc->address), 1);
+ p = (char *) q;
and progressively making more things const upwards, fixing fallout,
rinse repeat, until GDB built again (--enable-targets=all).
That ended up constifying lookup_cmd/add_cmd and (lots of) friends,
and the completers.
I didn't try to constify the command hooks themselves, because I know
upfront there are commands that write to the command string argument,
and I think I managed to stop at a nice non-hacky split point already.
I think the only non-really-super-obvious changes are
tracepoint.c:validate_actionline, and tracepoint.c:trace_dump_actions.
The rest is just mostly about 'char *' => 'const char *', 'char **'=>
'const char **', and the occasional (e.g., deprecated_cmd_warning)
case of 'char **'=> 'const char *', where/when I noticed that nothing
actually cares about the pointer to pointer output.
Tested on x86_64 Fedora 17, native and gdbserver.
gdb/
2013-03-13 Pedro Alves <palves@redhat.com>
* ada-lang.c (struct add_partial_datum) <text, text0, word>: Make
fields const.
(ada_make_symbol_completion_list): Make "text0" parameter const.
* ax-gdb.c (agent_eval_command_one): Make "exp" parameter const.
* breakpoint.c (condition_completer): Make "text" and "word"
parameters const. Adjust.
(check_tracepoint_command): Adjust to validate_actionline
prototype change.
(catch_syscall_completer): Make "text" and "word" parameters
const.
* cli/cli-cmds.c (show_user): Make "comname" local const.
(valid_command_p): Make "command" parameter const.
(alias_command): Make "alias_prefix" and "command_prefix" locals
const.
* cli/cli-decode.c (add_cmd): Make "name" parameter const.
(add_alias_cmd): Make "name" and "oldname" parameters const.
Adjust. No longer make copy of OLDNAME.
(add_prefix_cmd, add_abbrev_prefix_cmd, add_set_or_show_cmd)
(add_setshow_cmd_full, add_setshow_enum_cmd)
(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
(add_setshow_filename_cmd, add_setshow_string_cmd)
(add_setshow_string_noescape_cmd)
(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
(add_setshow_zuinteger_unlimited_cmd, add_setshow_zuinteger_cmd)
(delete_cmd, add_info, add_info_alias, add_com, add_com_alias):
Make "name" parameter const.
(help_cmd): Rename "command" parameter to "arg". New const local
"command".
(find_cmd): Make "command" parameter const.
(lookup_cmd_1): Make "text" parameter pointer to const. Adjust to
deprecated_cmd_warning prototype change.
(undef_cmd_error): Make "cmdtype" parameter const.
(lookup_cmd): Make "line" parameter const.
(deprecated_cmd_warning): Change type of "text" parameter to
pointer to const char, from pointer to pointer to char. Adjust.
(lookup_cmd_composition): Make "text" parameter const.
(complete_on_cmdlist, complete_on_enum): Make "text" and "word"
parameters const.
* cli/cli-decode.h (struct cmd_list_element) <name>: Make field
const.
* cli/cli-script.c (validate_comname): Make "tem" local const.
(define_command): New const local "tem_c". Use it in calls to
lookup_cmd.
(document_command): Make "tem" and "comfull" locals const.
(show_user_1): Make "prefix" and "name" parameters const.
* cli-script.h (show_user_1): Make "prefix" and "name" parameters
const.
* command.h (add_cmd, add_alias_cmd, add_prefix_cmd)
(add_abbrev_prefix_cmd, completer_ftype, lookup_cmd, lookup_cmd_1)
(deprecated_cmd_warning, lookup_cmd_composition, add_com)
(add_com_alias, add_info, add_info_alias, complete_on_cmdlist)
(complete_on_enum, add_setshow_enum_cmd)
(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
(add_setshow_filename_cmd, add_setshow_string_cmd)
(add_setshow_string_noescape_cmd)
(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
(add_setshow_zuinteger_cmd, add_setshow_zuinteger_unlimited_cmd):
Change prototypes, constifying strings.
* completer.c (noop_completer, filename_completer): Make "text"
and "prefix" parameters const.
(location_completer, expression_completer)
(complete_line_internal): Make "text" and "prefix" parameters
const and adjust.
(command_completer, signal_completer): Make "text" and "prefix"
parameters const.
* completer.h (noop_completer, filename_completer)
(expression_completer, location_completer, command_completer)
(signal_completer): Change prototypes.
* corefile.c (complete_set_gnutarget): Make "text" and "word"
parameters const.
* cp-abi.c (cp_abi_completer): Likewise.
* expression.h (parse_expression_for_completion): Change
prototype.
* f-lang.c (f_make_symbol_completion_list): Make "text" and "word"
parameters const.
* infcmd.c (_initialize_infcmd): Make "cmd_name" local const.
* infrun.c (handle_completer): Make "text" and "word" parameters
const.
* interps.c (interpreter_completer): Make "text" and "word"
parameters const.
* language.h (struct language_defn)
<la_make_symbol_completion_list>: Make "text" and "word"
parameters const.
* parse.c (parse_exp_1): Move const hack to parse_exp_in_context.
(parse_exp_in_context): Rename to ...
(parse_exp_in_context_1): ... this.
(parse_exp_in_context): Reimplement, with const hack from
parse_exp_1.
(parse_expression_for_completion): Make "string" parameter const.
* printcmd.c (decode_format): Make "string_ptr" parameter pointer
to pointer to const char. Adjust.
(print_command_1): Make "exp" parameter const.
(output_command): Rename to ...
(output_command_const): ... this. Make "exp" parameter const.
(output_command): Reimplement.
(x_command): Adjust.
(display_command): Rename "exp" parameter to "arg". New "exp"
local, const version of "arg".
* python/py-auto-load.c (gdbpy_initialize_auto_load): Make
"cmd_name" local const.
* python/py-cmd.c (cmdpy_destroyer): Cast const away in xfree
call.
(cmdpy_completer): Make "text" and "word" parameters const.
(gdbpy_parse_command_name): Make "prefix_text2" local const.
* python/py-param.c (add_setshow_generic): Make "tmp_name" local
const.
* remote.c (_initialize_remote): Make "cmd_name" local const.
* symtab.c (language_search_unquoted_string): Make "text" and "p"
parameters const. Adjust.
(completion_list_add_fields): Make "sym_text", "text" and "word"
parameters const.
(struct add_name_data) <sym_text, text, word>: Make fields const.
(default_make_symbol_completion_list_break_on): Make "text" and
"word" parameters const. Adjust locals.
(default_make_symbol_completion_list)
(make_symbol_completion_list, make_symbol_completion_type)
(make_symbol_completion_list_fn): Make "text" and "word"
parameters const.
(make_file_symbol_completion_list): Make "text", "word" and
"srcfile" parameters const. Adjust locals.
(add_filename_to_list): Make "text" and "word" parameters const.
(struct add_partial_filename_data) <text, word>: Make fields
const.
(make_source_files_completion_list): Make "text" and "word"
parameters const.
* symtab.h (default_make_symbol_completion_list_break_on)
(default_make_symbol_completion_list, make_symbol_completion_list)
(make_symbol_completion_type enum type_code)
(make_symbol_completion_list_fn make_file_symbol_completion_list)
(make_source_files_completion_list): Change prototype.
* top.c (execute_command): Adjust to pass pointer to pointer to
const char to lookup_cmd, and to deprecated_cmd_warning prototype
change.
(set_verbose): Make "cmdname" local const.
* tracepoint.c (decode_agent_options): Make "exp" parameter const,
and adjust.
(validate_actionline): Make "line" parameter a pointer to const
char, and adjust.
(encode_actions_1): Make "action_exp" local const, and adjust.
(encode_actions): Adjust.
(replace_comma): Delete.
(trace_dump_actions): Make "action_exp" and "next_comma" locals
const, and adjust. Don't frob the action string while splitting
it at commas. Instead, make a copy of each split substring in
turn.
(trace_dump_command): Adjust to validate_actionline prototype
change.
* tracepoint.h (decode_agent_options, decode_agent_options)
(encode_actions, validate_actionline): Change prototypes.
* valprint.h (output_command): Delete declaration.
(output_command_const): Declare.
* value.c (function_destroyer): Cast const away in xfree call.
We define the following packets:
Qbtrace:bts enable branch tracing for the current thread
returns "OK" or "Enn"
Qbtrace:off disable branch tracing for the current thread
returns "OK" or "Enn"
qXfer:btrace:read read the full branch trace data for the current thread
gdb/
* target.h (enum target_object): Add TARGET_OBJECT_BTRACE.
* remote.c: Include btrace.h.
(struct btrace_target_info): New struct.
(remote_supports_btrace): New function.
(send_Qbtrace): New function.
(remote_enable_btrace): New function.
(remote_disable_btrace): New function.
(remote_teardown_btrace): New function.
(remote_read_btrace): New function.
(init_remote_ops): Add btrace ops.
(enum <unnamed>): Add btrace packets.
(struct protocol_feature remote_protocol_features[]): Add btrace packets.
(_initialize_remote): Add packet configuration for branch tracing.
gdbserver/
* target.h (struct target_ops): Add btrace ops.
(target_supports_btrace): New macro.
(target_enable_btrace): New macro.
(target_disable_btrace): New macro.
(target_read_btrace): New macro.
* gdbthread.h (struct thread_info): Add btrace field.
* server.c: Include btrace-common.h.
(handle_btrace_general_set): New function.
(handle_btrace_enable): New function.
(handle_btrace_disable): New function.
(handle_general_set): Call handle_btrace_general_set.
(handle_qxfer_btrace): New function.
(struct qxfer qxfer_packets[]): Add btrace entry.
* inferiors.c (remove_thread): Disable btrace.
* linux-low: Include linux-btrace.h.
(linux_low_enable_btrace): New function.
(linux_low_read_btrace): New function.
(linux_target_ops): Add btrace ops.
* configure.srv (i[34567]86-*-linux*): Add linux-btrace.o.
Add srv_linux_btrace=yes.
(x86_64-*-linux*): Add linux-btrace.o.
Add srv_linux_btrace=yes.
* configure.ac: Define HAVE_LINUX_BTRACE.
* config.in: Regenerated.
* configure: Regenerated.
Hafiz Abid Qadeer <abidh@codesourcery.com>
gdb/
* NEWS: Mention set and show trace-buffer-size commands.
Mention new packet.
* target.h (struct target_ops): New method
to_set_trace_buffer_size.
(target_set_trace_buffer_size): New macro.
* target.c (update_current_target): Set up new method.
* tracepoint.c (trace_buffer_size): New global.
(start_tracing): Send it to the target.
(set_trace_buffer_size): New function.
(_initialize_tracepoint): Add new setshow for trace-buffer-size.
* remote.c (remote_set_trace_buffer_size): New function.
(_initialize_remote): Use it.
(QTBuffer:size) New remote command.
(PACKET_QTBuffer_size): New enum.
(remote_protocol_features): Add an entry for
PACKET_QTBuffer_size.
gdb/gdbserver/
* tracepoint.c (trace_buffer_size): New global.
(DEFAULT_TRACE_BUFFER_SIZE): New define.
(init_trace_buffer): Change to one-argument function. Allocate
trace buffer memory.
(handle_tracepoint_general_set): Call cmd_bigqtbuffer_size to
handle QTBuffer:size packet.
(cmd_bigqtbuffer_size): New function.
(initialize_tracepoint): Call init_trace_buffer with
DEFAULT_TRACE_BUFFER_SIZE.
* server.c (handle_query): Add QTBuffer:size in the
supported packets.
gdb/doc/
* gdb.texinfo (Starting and Stopping Trace Experiments): Document
trace-buffer-size set and show commands.
(Tracepoint Packets): Document QTBuffer:size.
(General Query Packets): Document QTBuffer:size.
gdb/testsuite/
* gdb.trace/trace-buffer-size.exp: New file.
* gdb.trace/trace-buffer-size.c: New file.
Move the declarations to a header, rather than declaring them in
(multiple) .c files.
gdb/
2013-03-07 Pedro Alves <palves@redhat.com>
* remote.c (hex2bin, bin2hex): Move extern declarations to ...
* remote.h (hex2bin, bin2hex): ... here.
* tracepoint.c (hex2bin, bin2hex): Remove extern declarations.
Hafiz Abid Qadeer <abidh@codesourcery.com>
gdb/
* NEWS: Mention new field "trace-file".
* tracepoint.c (trace_status_mi): Output "trace-file" field.
(tfile_open): Record the trace file's filename in the trace
status.
(tfile_files_info): Mention the name of the trace file.
Check the "filename" field explicitely.
(trace_status_command): Explicitely check "filename" field.
(trace_find_command): Ditto.
(trace_find_pc_command): Ditto.
(trace_find_tracepoint_command): Ditto.
(trace_find_line_command): Ditto.
(trace_find_range_command): Ditto.
(trace_find_outside_command): Ditto.
* tracepoint.h (struct trace_status) <from_file>: Rename it
to "filename" and make it hold the trace file's filename
instead of a boolean.
* remote.c (remote_get_trace_status): Initialize "filename"
field with NULL instead of 0.
gdb/doc/
* gdb.texinfo (GDB/MI Tracepoint Commands) <-trace-status>:
Document the "trace-file" field.
gdb/testsuite/
* gdb.trace/tfile.exp: Add test for -trace-status command.
Yao writes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GDB gets an internal error when it connects to GDBserver started with
'--disable-packet=qC'.
Sending packet: $QNonStop:0#8c...Packet received: OK
Sending packet: $?#3f...Packet received: T0505:00000000;04:00f0ffbf;08:b0c2e44c;thread:p4255.4255;core:1;
Sending packet: $Hc-1#09...Packet received: E01
Sending packet: $qC#b4...Packet received:
Sending packet: $qAttached:a410#bf...Packet received: E01
Packet qAttached (query-attached) is supported
warning: Remote failure reply: E01
Sending packet: $qOffsets#4b...Packet received:
../../../git/gdb/target.c:3248: internal-error: Can't determine the current address space of thread Thread 16981
When start remote, the call chain is as follows,
remote_start_remote
add_current_inferior_and_thread <--[1]
...
start_remote
wait_for_inferior
remote_wait_as
process_stop_reply
get_thread_arch_regcache <--[2]
remote_notice_new_inferior <--[3]
GDB sends packet "qC" in [1] and adds the thread/inferior if the remote
stubs understands "qC". In [2], GDB looks for the inferior to build a
regcache, and notices a new inferior in [3]. As we can see, GDB assumes
that the inferior can be found in [2]. Once the remote stub doesn't
support "qC", GDB can't look for the inferior in [2], and emits an
internal error.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Right after the initial connection, we query the target for its state,
with the ? packet. We store the resulting wait status / stop reply
aside, and query the target for the current thread, using qC, which
fails, so we fake a ptid for the target's thread. We then later,
after the initial setup, end up consuming that set-aside wait status,
parsing the T stop reply, which contains a "thread" "register" (which
was the thread the target would have replied to qC). We get into
trouble because the ptid in that stop reply doesn't match our faked up
ptid in the initial setup, although the target threads are the same...
So we had the T stop reply handy all along. We might as well extract
the thread's ptid from it, and avoid all the resulting issues.
qC is also used after vRun, in order to discover the new process'es
main thread. But, vRun's reply is also a wait status, just like
'?''s, which is quite convenient.
This means that if we have a "Txx thread: ptid" reply, then we don't
really need qC. The patch makes GDB look in the T reply first, and if
not found, try with qC. The packet handling seems to have been added
in gdb-4.18 (1999), and I see that in that same release, "Txx thread:
ptid" didn't exist yet, which probably explains why nobody though of
doing this before.
Regression tested against a gdbserver with qC disabled (and then
enabled), on x86_64 Fedora 17.
2013-01-25 Pedro Alves <palves@redhat.com>
* remote.c (stop_reply_extract_thread): New.
(add_current_inferior_and_thread): New parameter 'wait_status'.
Handle it.
(remote_start_remote): Pass wait status to
add_current_inferior_and_thread.
(extended_remote_run): Update comment.
(extended_remote_create_inferior_1): Pass wait status to
add_current_inferior_and_thread.
Pedro Alves <palves@redhat.com>
PR remote/14786
* remote.c (remote_threads_info): Make a copy of the reply from
qfThreadInfo and use that instead of rs->buf.
Two modifications:
1. The addition of 2013 to the copyright year range for every file;
2. The use of a single year range, instead of potentially multiple
year ranges, as approved by the FSF.
2012-12-15 Yao Qi <yao@codesourcery.com>
* remote.c (getpkt_or_notif_sane): Add one more argument in
its declaration.
(getpkt_or_notif_sane_1): Add one more argument.
(getpkt_sane): Update caller.
(getpkt_or_notif_sane): Likewise. Update call
togetpkt_or_notif_sane_1.
(remote_wait_ns): Update caller.
there is an error inserting hardware breakpoints and use the
error message from the target.
* gdb/breakpoint.c (insert_bp_location, insert_breakpoint_locations):
Catch this exception and print the error message contained within. Do not
print the default hardware error breakpoint message in this case.
* cli/cli-cmds.c (max_user_call_depth): Add 'unsigned'.
(init_cmds): Call add_setshow_uinteger_cmd for command
'max-user-call-depth'.
* cli/cli-script.c (execute_user_command): Add 'unsigned' to the
declaration of 'max_user_call_depth'.
* frame.c (backtrace_limit): Add 'unsigned'.
(_initialize_frame): Call add_setshow_uinteger_cmd for command
'limit'.
* remote.c (remoteaddresssize): Add 'unsigned'.
(remote_address_masked): Change local var 'address_size' to
'unsigned'.
(_initialize_remote): Call add_setshow_uinteger_cmd for
'remoteaddresssize'.
* top.c (history_size): Add 'unsigned'.
(show_commands): Change local variables to 'unsigned'.
(set_history_size_command): Don't check history_size is negative.
Adjust the condition to call unstifle_history and set history_size
to UNIT_MAX.
