Commit Graph

116242 Commits

Author SHA1 Message Date
Simon Marchi d6bfbb5256 gdb: scope down registers_changed call in inferior::set_arch
inferior::set_arch calls registers_changed, which invalidates all
regcaches.  It would be enough to invalidate only regcaches of threads
belonging to this inferior.  Call registers_changed_ptid instead, with
the proper process target / ptid.  If the inferior does not have a
process target, there should be no regcaches for that inferior, so no
need to invalidate anything.

Change-Id: Id8b5500acb7f373b01a534f16d3a7d028dc0d882
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 10:44:35 -04:00
Simon Marchi 99d9c3b92c gdb: remove target_gdbarch
This function is just a wrapper around the current inferior's gdbarch.
I find that having that wrapper just obscures where the arch is coming
from, and that it's often used as "I don't know which arch to use so
I'll use this magical target_gdbarch function that gets me an arch" when
the arch should in fact come from something in the context (a thread,
objfile, symbol, etc).  I think that removing it and inlining
`current_inferior ()->arch ()` everywhere will make it a bit clearer
where that arch comes from and will trigger people into reflecting
whether this is the right place to get the arch or not.

Change-Id: I79f14b4e4934c88f91ca3a3155f5fc3ea2fadf6b
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 10:44:35 -04:00
Simon Marchi 72c4529c85 gdb: move set_target_gdbarch to inferior::set_arch
set_target_gdbarch is basically a setter for the current inferior's
arch, that notifies other parts of GDB of the architecture change.  Move
the code of set_target_gdbarch to the inferior::set_arch method.

Add gdbarch_initialized_p, so we can keep the assertion.

Change-Id: I276e28eafd4740c94bc5233c81a86c01b4a6ae90
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 10:44:35 -04:00
Simon Marchi 97153a2bbf gdb: add inferior parameter to architecture_changed observable
This is to make it explicit which inferior's architecture just changed,
and that the callbacks should not assume it is the current inferior.

Update the only caller, pyuw_on_new_gdbarch, to add the parameter,
although it doesn't use it currently.

Change-Id: Ieb7f21377e4252cc6e7b1ce2cc812cd1a1840e0e
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 10:44:35 -04:00
Simon Marchi 27b1f19f8f gdb: add inferior::{arch, set_arch}
Make the inferior's gdbarch field private, and add getters and setters.
This helped me by allowing putting breakpoints on set_arch to know when
the inferior's arch was set.  A subsequent patch in this series also
adds more things in set_arch.

Change-Id: I0005bd1ef4cd6b612af501201cec44e457998eec
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 10:44:35 -04:00
Alan Modra ae0d827fa4 asan: buffer overflow in elf32_arm_get_synthetic_symtab
Guard against fuzzed files where .plt size isn't commensurate with
plt relocations.

	* elf32-arm.c (elf32_arm_plt0_size): Add data_size param.
	Return -1 if data_size is too small.
	(elf32_arm_plt_size): Likewise.  Delete temp var.  Formatting.
	(elf32_arm_get_synthetic_symtab): Adjust to suit.
2023-10-10 22:17:29 +10:30
Alan Modra f22f27f46c asan: null dereference in read_and_display_attr_value
This fixes multiple places in read_and_display_attr_value dealing with
range and location lists that can segfault when debug_info_p is NULL.
Fuzzed object files can contain arbitrary DW_FORMs.

	* dwarf.c (read_and_display_attr_value): Don't dereference NULL
	debug_info_p.
2023-10-10 22:17:29 +10:30
Alan Modra 322b071c45 asan: invalid free in bfd_init_section_compress_status
With specially crafted compressed sections, it's possible to tickle a
problem when decompressing:  If the compression headers says the
uncompressed size is zero, this will be seen as an error return from
bfd_compress_section_contents.  On errors the caller should free any
malloc'd input buffers, but this isn't really an error and the section
contents have been updated to a bfd_alloc'd buffer which can't be
freed.

	* compress.c (bfd_compress_section_contents): Return -1 as error
	rather than 0.
	(bfd_init_section_compress_status, bfd_compress_section): Adjust.
2023-10-10 22:17:29 +10:30
Jan Vrany 4825fd2d35 gdb/python: implement support for sending custom MI async notifications
This commit adds a new Python function, gdb.notify_mi, that can be used
to emit custom async notification to MI channel.  This can be used, among
other things, to implement notifications about events MI does not support,
such as remote connection closed or register change.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 11:22:56 +01:00
Jan Vrany 80a3485f81 gdb/python: generalize serialize_mi_result()
This commit generalizes serialize_mi_result() to make usable in
different contexts than printing result of custom MI command.

To do so, the check whether passed Python object is a dictionary has been
moved to the caller - at the very least, different uses require different
error messages.  Also it has been renamed to serialize_mi_results() to better
match GDB/MI output syntax (see corresponding section in documentation,
in particular rules 'result-record' and 'async-output'.

Since it is now more generic function, it has been moved to py-mi.c.

This is a preparation for implementing Python support for sending custom
MI async events.

Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-10 11:22:56 +01:00
mengqinggang 1fb3cdd87e LoongArch/GAS: Add support for branch relaxation
For the instructions of R_LARCH_B16/B21, if the immediate overflow,
add a B instruction and R_LARCH_B26 relocation.

For example:

.L1
  ...
  blt $t0, $t1, .L1
    R_LARCH_B16

change to:

.L1
  ...
  bge $t0, $t1, .L2
  b .L1
    R_LARCH_B26
.L2
2023-10-10 16:34:33 +08:00
Tom de Vries 9847ba8f08 [readelf] Handle .gdb_index section version 9
Add the abilitity to print a v9 .gdb_index section.

The v9 section contains an extra table, which is printed as follows:
...
Shortcut table:
Language of main: Fortran 95
Name of main: contains_keyword
...

[ For the example, I used the exec of gdb test-case
gdb.fortran/nested-funcs-2-exp when running the test-case with target board
cc-with-gdb-index. ]

Tested on x86_64-linux.

Approved-By: Nick Clifton <nickc@redhat.com>
2023-10-10 10:26:40 +02:00
Matheus Branco Borella 8b9c08edda [gdb/symtab] Add name_of_main and language_of_main to the DWARF index
This patch adds a new section to the DWARF index containing the name
and the language of the main function symbol, gathered from
`cooked_index::get_main`, if available. Currently, for lack of a better name,
this section is called the "shortcut table". The way this name is both saved and
applied upon an index being loaded in mirrors how it is done in
`cooked_index_functions`, more specifically, the full name of the main function
symbol is saved and `set_objfile_main_name` is used to apply it after it is
loaded.

The main use case for this patch is in improving startup times when dealing with
large binaries. Currently, when an index is used, GDB has to expand symtabs
until it finds out what the language of the main function symbol is. For some
large executables, this may take a considerable amount of time to complete,
slowing down startup. This patch bypasses that operation by having both the name
and language of the main function symbol be provided ahead of time by the index.

In my testing (a binary with about 1.8GB worth of DWARF data) this change brings
startup time down from about 34 seconds to about 1.5 seconds.

When testing the patch with target board cc-with-gdb-index, test-case
gdb.fortran/nested-funcs-2.exp starts failing, but this is due to a
pre-existing issue, filed as PR symtab/30946.

Tested on x86_64-linux, with target board unix and cc-with-gdb-index.

PR symtab/24549
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=24549

Approved-By: Tom de Vries <tdevries@suse.de>
2023-10-10 10:26:40 +02:00
GDB Administrator d883c61283 Automatic date update in version.in 2023-10-10 00:00:49 +00:00
John Baldwin a8ff7b9f87 gdb_unique_ptr.h: Fix a typo in a comment 2023-10-09 09:59:12 -07:00
Nick Clifton 1b334e27f8 Fix: Null pointer dereference in ldlex.l
PR 30951
  * ldlex.l (yy_input): Check for YY_CURRENT_BUFFER being NULL.
2023-10-09 17:52:39 +01:00
Nick Clifton ee1cb49e5a Fix: A potential null_pointer_deference bug
PR 30954
  * ldlang.c (map_input_to_output_sections): Check that os is non NULL before using it.
2023-10-09 17:13:25 +01:00
Nick Clifton cb0f1baf44 Fix: Null pointer dereference in elf32-i386.c
PR 30950
  * elf32-i386.c (elf_i386_convert_load_reloc): Check for elf_x86_hash_table returning a NULL pointer.
2023-10-09 16:53:27 +01:00
Nick Clifton e7c3fa04b6 Fix: A potential bug of null pointer dereference
PR 30949
  * elflink.c (elf_gc_mark_debug_section): Check for bfd_section_from_elf_index returning a NULL pointer.
2023-10-09 15:14:52 +01:00
Andrew Burgess 2f349e7d2a gdb/testsuite: match complete lines in gdb.base/maint.exp
This thread:

  https://inbox.sourceware.org/gdb-patches/20231003195338.334948-1-thiago.bauermann@linaro.org/

pointed out that within gdb.base/maint.exp, some regexps within a
gdb_test_multiple were failing to match a complete line, while later
regexps within the gdb_test_multiple made use of the '^' anchor, and
so assumed that earlier lines had been completely matched and removed
from expect's buffer.

When testing with READ1 set this assumption was failing.

Fix this by extending the offending patterns with a trailing '\r\n'.

Tested-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
2023-10-09 10:43:34 +01:00
GDB Administrator 4503c19bc5 Automatic date update in version.in 2023-10-09 00:00:25 +00:00
Joel Brobecker bfc5766418 Update gdb/NEWS after GDB 14 branch creation.
This commit a new section for the next release branch, and renames
the section of the current branch, now that it has been cut.
2023-10-08 10:04:34 +02:00
Joel Brobecker 7c841d2923 Bump version to 15.0.50.DATE-git.
Now that the GDB 14 branch has been created,
this commit bumps the version number in gdb/version.in to
15.0.50.DATE-git

For the record, the GDB 14 branch was created
from commit 8f12a1a841.

Also, as a result of the version bump, the following changes
have been made in gdb/testsuite:

	* gdb.base/default.exp: Change $_gdb_major to 15.
2023-10-08 09:52:29 +02:00
cailulu 8f12a1a841 Add testsuits for new assembler option of mthin-add-sub. 2023-10-08 09:18:12 +08:00
cailulu 816029e067 as: add option for generate R_LARCH_32/64_PCREL.
Some older kernels cannot handle the newly generated R_LARCH_32/64_PCREL,
so the assembler generates R_LARCH_ADD32/64+R_LARCH_SUB32/64 by default,
and use the assembler option mthin-add-sub to generate R_LARCH_32/64_PCREL
as much as possible.

The Option of mthin-add-sub does not affect the generation of R_LARCH_32_PCREL
relocation in .eh_frame.
2023-10-08 09:18:12 +08:00
GDB Administrator b68c661196 Automatic date update in version.in 2023-10-08 00:00:44 +00:00
Michael J. Eager a3f6124483 Revert "opcodes: microblaze: Add new bit-field instructions"
This reverts commit 6bbf249557.

Maciej W. Rozycki <macro@orcam.me.uk>:
 Yet it has caused numerous regressions:

microblaze-elf  +FAIL: unordered .debug_info references to .debug_ranges
microblaze-elf  +FAIL: binutils-all/pr26548
microblaze-elf  +FAIL: readelf -Wwi pr26548e (reason: unexpected output)
microblaze-elf  +FAIL: readelf --debug-dump=loc locview-1 (reason: unexpected output) Yet it has caused numerous regressions:
microblaze-elf  +FAIL: unordered .debug_info references to .debug_ranges
microblaze-elf  +FAIL: binutils-all/pr26548
microblaze-elf  +FAIL: readelf -Wwi pr26548e (reason: unexpected output)
...
2023-10-07 15:33:10 -07:00
Tom de Vries 6542e3df20 [gdb/testsuite] Fix gdb.arch/i386-signal.exp on x86_64
On x86_64-linux, with test-case gdb.arch/i386-signal.exp I run into:
...
builtin_spawn -ignore SIGHUP gcc -fno-stack-protector i386-signal.c \
  -fdiagnostics-color=never -fno-pie -g -no-pie -lm -o i386-signal^M
/tmp/cc2xydTG.s: Assembler messages:^M
/tmp/cc2xydTG.s:50: Error: operand size mismatch for `push'^M
compiler exited with status 1
output is:
/tmp/cc2xydTG.s: Assembler messages:^M
/tmp/cc2xydTG.s:50: Error: operand size mismatch for `push'^M

gdb compile failed, /tmp/cc2xydTG.s: Assembler messages:
/tmp/cc2xydTG.s:50: Error: operand size mismatch for `push'
UNTESTED: gdb.arch/i386-signal.exp: failed to compile
...

This is with gas 2.41, it compiles without problems with gas 2.40.  Some more
strict checking was added in commit 5cc007751c ("x86: further adjust
extend-to-32bit-address conditions").  This may or may not be a gas regression
( https://sourceware.org/pipermail/binutils/2023-October/129818.html ).

The offending bit is:
...
    "    push $sigframe\n"
...
which refers to a function:
...
    "    .globl sigframe\n"
    "sigframe:\n"
...

The test-case passes with target board unix/-m32.

Make the test-case work by using pushq instead of push for the
is_amd64_regs_target case.

Tested on x86_64-linux, with target boards:
- unix/-m64 (is_amd64_regs_target == 1), and
- unix/-m32 (is_amd64_regs_target == 0),

PR testsuite/30928
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30928
2023-10-07 10:33:29 +02:00
Ilya Leoshkevich 7a3bb62d82 gdb: support rseq auxvs
Linux kernel commit commit 317c8194e6ae ("rseq: Introduce feature size
and alignment ELF auxiliary vector entries") introduced two new auxvs:
AT_RSEQ_FEATURE_SIZE and AT_RSEQ_ALIGN.  Support them in GDB.  This
fixes auxv.exp on kernels >= v6.3.

Change-Id: I8966c4d5c73eb7b45de6d410a9b28a6628edad2e
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30540
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 21:29:11 -04:00
Vladimir Mezentsev 08330ace11 gprofng: 30910 cross test fail: can't read "CHECK_TARGET": no such variable
When TCL_TRY is FALSE, the wrong check-DEJAGNU is generated.
Place "if TCL_TRY / endif" in the right place.

gprofng/ChangeLog
2023-10-05  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/30910
	* Makefile.am: Correct "if TCL_TRY / endif".
	* Makefile.in: Rebuild.
2023-10-06 17:29:22 -07:00
GDB Administrator c09200601f Automatic date update in version.in 2023-10-07 00:00:25 +00:00
Thiago Jung Bauermann 0f3efefb34 process-dies-while-detaching.exp: Exit early if GDB misses sync breakpoint
I'm seeing a lot of variability in the failures of
gdb.threads/process-dies-while-detaching.exp on aarch64-linux.  On this
platform, a problem yet to be investigated causes GDB to miss the _exit
breakpoint.  What happens next is random because after missing that
breakpoint, GDB is out of sync with the inferior.  This causes the tests
following that point in the testcase to fail in a random way.

In this scenario it's better to exit the testcase early to avoid random
results in the testsuite.

We are relying on gdb_continue_to_breakpoint to return the result of
gdb_test_multiple.  This is already the case because in Tcl the return
value of a function is the return value of the last command it runs.  But
change gdb_continue_to_breakpoint to explicitly return this value, to make
it clear this is the intended behaviour.

Tested on aarch64-linux.

Tested-By: Guinevere Larsen <blarsen@redhat.com>
Approved-By: Andrew Burgess <aburgess@redhat.com>
2023-10-06 17:36:42 -03:00
Neal Frager 6bbf249557 opcodes: microblaze: Add new bit-field instructions
This patches adds new bsefi and bsifi instructions.
BSEFI- The instruction shall extract a bit field from a
register and place it right-adjusted in the destination register.
The other bits in the destination register shall be set to zero.
BSIFI- The instruction shall insert a right-adjusted bit field
from a register at another position in the destination register.
The rest of the bits in the destination register shall be unchanged.

Further documentation of these instructions can be found here:
https://docs.xilinx.com/v/u/en-US/ug984-vivado-microblaze-ref

This patch has been tested for years of AMD Xilinx Yocto
releases as part of the following patch set:

https://github.com/Xilinx/meta-xilinx/tree/master/meta-microblaze/recipes-devtools/binutils/binutils

Signed-off-by: nagaraju <nagaraju.mekala@amd.com>
Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@amd.com>
Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Michael J. Eager <eager@eagercon.com>
2023-10-06 10:53:45 -07:00
Andrew Burgess 9a896be332 gdb/NEWS: reorder some entries in the NEWS file
I spotted two entries in the NEWS file that I believe are in the wrong
place, these are:

  - An entry about MI v1 being deprecated, this feels like it should
    be the first entry under the 'MI changes' heading, and

  - An entry for the $_shell convenience function which is currently
    under the 'New commands' heading (sort of), when I think this
    should be listed in the general news section.
2023-10-06 13:18:15 +01:00
Andrew Burgess dd6a9ec16e gdbserver: fix gdbserver builds after expedite_regs changes
After this commit:

  commit 6a65998a8a
  Date:   Mon Sep 11 12:42:00 2023 +0100

      Convert tdesc's expedite_regs to a string vector

The risc-v, loongarch, and csky gdbserver builds were broken.  A use
of target_desc::expedite_regs (for each architecture)  was not updated
to take account of the type change.

I've tested that this fixes the risc-v build.  I haven't tested the
other architectures, but they should be fine.
2023-10-06 13:16:16 +01:00
Andrew Burgess fef7f251fe gdb/testsuite: cleanup in gdb.base/args.exp
The last few commits resolved the KFAILs in gdb.base/args.exp.  With
those out of the way we can clean up this test script a little.

In this commit I have:

  - Stopped passing 'nowarnings' flag when building the source file.
    I see no reason why this source should issue a warning,

  - Moved setup of GDBFLAGS into args_test proc, callers that passed a
    newline needed a small tweak, and also the matching code needs
    updating for newline handling, but I think this is nicer, the
    argument lists are now given just once,

  - Updated comment on args_test,

  - Updated other comments.

There should be no change in what is tested after this commit.

Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 13:02:36 +01:00
Andrew Burgess f9089d2f7b gdbserver: cleanup in handle_v_run
After the previous commit there is now a redundant string copy in
handle_v_run, this commit cleans that up.

There should be no functional change after this commit.

During review I was pointed to this older series:

  https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/

which also includes this fix as part of a larger set of changes.  I'm
giving a Co-Authored-By credit to the author of that original series.
I believe this smaller fix brings some benefits on its own, though the
original series does offer additional improvements.  Once this is
merged I'll take a look at rebasing and resubmitting the original series.

Co-Authored-By: Michael Weghorn <m.weghorn@posteo.de>
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 13:02:36 +01:00
Andrew Burgess 67e6945b7e gdbserver: handle newlines in inferior arguments
Similarly to how single quotes were mishandled, which was fixed two
commits ago, this commit fixes handling of newlines in arguments
passed to gdbserver.

We already had a test that covered this, gdb.base/args.exp, which,
when run with the native-extended-gdbserver board contained several
KFAIL covering this situation.

In this commit I remove the unnecessary, attempt to quote incoming
newlines within arguments, and do some minimal cleanup of the related
code.  There is additional cleanup that can be done, but I'm leaving
that for the next commit.

Then I've removed the KFAIL from the test case, and performed some
minimal cleanup there too.

After this commit the gdb.base/args.exp is 100% passing with the
native-extended-gdbserver board file.

During review I was pointed to this older series:

  https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/

which also includes this fix as part of a larger set of changes.  I'm
giving a Co-Authored-By credit to the author of that original series.
I believe this smaller fix brings some benefits on its own, though the
original series does offer additional improvements.  Once this is
merged I'll take a look at rebasing and resubmitting the original series.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27989

Co-Authored-By: Michael Weghorn <m.weghorn@posteo.de>
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 13:02:36 +01:00
Andrew Burgess 7663126c0b gdbserver: fix handling of trailing empty argument
When I posted the previous patch for review Andreas Schwab pointed out
that passing a trailing empty argument also doesn't work.

The fix for this is in the same area of code as the previous patch,
but is sufficiently different that I felt it deserved a patch of its
own.

I noticed that passing arguments containing single quotes to gdbserver
didn't work correctly:

  gdb -ex 'set sysroot' --args /tmp/show-args
  Reading symbols from /tmp/show-args...
  (gdb) target extended-remote | gdbserver --once --multi - /tmp/show-args
  Remote debugging using | gdbserver --once --multi - /tmp/show-args
  stdin/stdout redirected
  Process /tmp/show-args created; pid = 176054
  Remote debugging using stdio
  Reading symbols from /lib64/ld-linux-x86-64.so.2...
  (No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
  0x00007ffff7fd3110 in _start () from /lib64/ld-linux-x86-64.so.2
  (gdb) set args abc ""
  (gdb) run
  The program being debugged has been started already.
  Start it from the beginning? (y or n) y
  Starting program: /tmp/show-args \'
  stdin/stdout redirected
  Process /tmp/show-args created; pid = 176088
  2 args are:
    /tmp/show-args
    abc
  Done.
  [Inferior 1 (process 176088) exited normally]
  (gdb) target native
  Done.  Use the "run" command to start a process.
  (gdb) run
  Starting program: /tmp/show-args \'
  2 args are:
    /tmp/show-args
    abc

  Done.
  [Inferior 1 (process 176095) exited normally]
  (gdb) q

The 'shows-args' program used here just prints the arguments passed to
the inferior.

Notice that when starting the inferior using the extended-remote
target there is only a single argument 'abc', while when using the
native target there is a second argument, the blank line, representing
the empty argument.

The problem here is that the vRun packet coming from GDB looks like
this (I've removing the trailing checksum):

  $vRun;PROGRAM_NAME;616263;

If we compare this to a packet with only a single argument and no
trailing empty argument:

  $vRun;PROGRAM_NAME;616263

Notice the lack of the trailing ';' character here.

The problem is that gdbserver processes this string in a loop.  At
each point we maintain a pointer to the character just after a ';',
and then we process everything up to either the next ';' character, or
to the end of the string.

We break out of this loop when the character we start with (in that
loop iteration) is the null-character.  This means in the trailing
empty argument case, we abort the loop before doing anything with the
empty argument.

In this commit I've updated the loop, we now break out using a 'break'
statement at the end of the loop if the (sub-)string we just processed
was empty, with this change we now notice the trailing empty
argument.

I've updated the test case to cover this issue.

Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 13:02:36 +01:00
Andrew Burgess f1f0a06d5b gdbserver: fix handling of single quote arguments
I noticed that passing arguments containing single quotes to gdbserver
didn't work correctly:

  gdb -ex 'set sysroot' --args /tmp/show-args
  Reading symbols from /tmp/show-args...
  (gdb) target extended-remote | gdbserver --once --multi - /tmp/show-args
  Remote debugging using | gdbserver --once --multi - /tmp/show-args
  stdin/stdout redirected
  Process /tmp/show-args created; pid = 176054
  Remote debugging using stdio
  Reading symbols from /lib64/ld-linux-x86-64.so.2...
  (No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
  0x00007ffff7fd3110 in _start () from /lib64/ld-linux-x86-64.so.2
  (gdb) set args \'
  (gdb) r
  The program being debugged has been started already.
  Start it from the beginning? (y or n) y
  Starting program: /tmp/show-args \'
  stdin/stdout redirected
  Process /tmp/show-args created; pid = 176088
  2 args are:
    /tmp/show-args
    \'
  Done.
  [Inferior 1 (process 176088) exited normally]
  (gdb) target native
  Done.  Use the "run" command to start a process.
  (gdb) run
  Starting program: /tmp/show-args \'
  2 args are:
    /tmp/show-args
    '
  Done.
  [Inferior 1 (process 176095) exited normally]
  (gdb) q

The 'shows-args' program used here just prints the arguments passed to
the inferior.

Notice that when starting the inferior using the extended-remote
target the second argument is "\'", while when running using native
target the argument is "'".  The second of these is correct, the \'
used with the "set args" command is just to show GDB that the single
quote is not opening an argument string.

It turns out that the extra backslash is injected on the gdbserver
side when gdbserver processes the arguments that GDB passes it, the
code that does this was added as part of this much larger commit:

  commit 2090129c36
  Date:   Thu Dec 22 21:11:11 2016 -0500

      Share fork_inferior et al with gdbserver

In this commit I propose removing the specific code that adds what I
believe is a stray backslash.  I've extended an existing test to cover
this case, and I now see identical behaviour when using an
extended-remote target as with the native target.

This partially fixes PR gdb/27989, though there are still some issues
with newline handling which I'll address in a later commit.

During review I was pointed to this older series:

  https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/

which also includes this fix as part of a larger set of changes.  I'm
giving a Co-Authored-By credit to the author of that original series.
I believe this smaller fix brings some benefits on its own, though the
original series does offer additional improvements.  Once this is
merged I'll take a look at rebasing and resubmitting the original series.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27989

Co-Authored-By: Michael Weghorn <m.weghorn@posteo.de>
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-06 13:02:36 +01:00
Nick Clifton b75b3eb082 Fix: alpha: ld segfaults in
PR 30940
  * elf64-alpha.c (elf64_alpha_check_relocs): Correct error message.
2023-10-06 10:52:02 +01:00
Thiago Jung Bauermann 740ce35025 gdb/configure.ac: Add option --with-additional-debug-dirs
If you want to install GDB in a custom prefix, have it look for debug info
in that prefix but also in the distro's default location (typically,
/usr/lib/debug) and run the GDB testsuite before doing "make install", you
have a bit of a problem:

Configuring GDB with '--prefix=$PREFIX' sets the GDB 'debug-file-directory'
parameter to $PREFIX/lib/debug.  Unfortunately this precludes GDB from
looking for distro-installed debug info in /usr/lib/debug.  For regular GDB
use you could set debug-file-directory to $PREFIX:/usr/lib/debug in
$PREFIX/etc/gdbinit so that GDB will look in both places, but if you want
to run the testsuite then that doesn't help because in that case GDB runs
with the '-nx' option.

There's the configure option '--with-separate-debug-dir' to set the default
value for 'debug-file-directory', but it accepts only one directory and not
a list.  I considered modifying it to accept a list, but it's not obvious
how to do that because its value is also used by BFD, as well as processed
for "relocatability".

I thought it was simpler to add a new option to specify a list of
additional directories that will be appended to the debug-file-directory
setting.

Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 22:58:11 -03:00
GDB Administrator 1aa39bcc2e Automatic date update in version.in 2023-10-06 00:00:38 +00:00
Tom de Vries 3f57726190 [gdb/go] Handle v3 go_0 mangled prefix
With gcc-10 we have:
...
(gdb) break package2.Foo^M
Breakpoint 2 at 0x402563: file package2.go, line 5.^M
(gdb) PASS: gdb.go/package.exp: setting breakpoint 1
...
but with gcc-11:
...
gdb) break package2.Foo^M
Function "package2.Foo" not defined.^M
Make breakpoint pending on future shared library load? (y or [n]) n^M
(gdb) FAIL: gdb.go/package.exp: gdb_breakpoint: set breakpoint at package2.Foo
...

In the gcc-10 case, though the exec contains dwarf, it's not used to set the
breakpoint (which is an independent problem, filed as PR go/30941), instead
the minimal symbol information is used.

The minimal symbol information changed between gcc-10 and gcc-11:
...
$ nm a.out.10 | grep Foo
000000000040370d T go.package2.Foo
0000000000404e50 R go.package2.Foo..f
$ nm a.out.11 | grep Foo
0000000000403857 T go_0package2.Foo
0000000000405030 R go_0package2.Foo..f
...

A new v3 mangling scheme was used.  The mangling schemes define a separator
character and mangling character:
- for v2, dot is used both as separator character and mangling character, and
- for v3, dot is used as separator character and underscore as mangling
  character.

For more details, see [1] and [2].

In v3, "_0" demangles to ".". [ See gcc commit a01dda3c23b ("compiler, libgo:
change mangling scheme"), function Special_char_code::Special_char_code. ]

Handle the new go_0 prefix in unpack_mangled_go_symbol, which fixes the
test-case.

Note that this doesn't fix this regression:
...
$ gccgo-10 package2.go -c -g0
$ gccgo-10 package1.go package2.o -g0
$ gdb -q -batch a.out -ex "break go.package2.Foo"
Breakpoint 1 at 0x40370d
$ gccgo-11 package2.go -c -g0
$ gccgo-11 package1.go package2.o -g0
$ gdb -q -batch a.out -ex "break go.package2.Foo"
Function "go.package2.Foo" not defined.
...

With gcc-10, we set a breakpoint on the mangled minimal symbol.  That
one has simply changed for gcc-11, so it's equivalent to using:
...
$ gdb -q -batch a.out -ex "break go_0package2.Foo"
Breakpoint 1 at 0x403857
...
which does work.

Tested on x86_64-linux:
- openSUSE Leap 15.4, using gccgo-7,
- openSUSE Tumbleweed, using gccgo-13.

PR go/27238
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27238

[1] https://go-review.googlesource.com/c/gofrontend/+/271726
[2] https://github.com/golang/go/issues/41862#issuecomment-707244103
2023-10-05 23:22:11 +02:00
Simon Marchi 0b6a94ecbc gdb: use objfile->pspace in free_objfile observers
Use objfile->pspace instead of current_program_space.

Change-Id: I127a1788e155b321563114452ed5b530f1d1f618
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00
Simon Marchi e0322c6a7b gdb: remove unnecessary nullptr check in free_objfile observers
The free_objfile observable is never called with a nullptr objfile.

Change-Id: I1e990edeb45bc38009ccb129c623911097ab65fe
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00
Simon Marchi 74daa597e7 gdb: add all_objfiles_removed observer
The new_objfile observer is currently used to indicate both when a new
objfile is added to program space (when passed non-nullptr) and when all
objfiles of a program space were just removed (when passed nullptr).
I think this is confusing (and Andrew apparently thinks so too [1]).
Add a new "all_objfiles_removed" observer to remove the second role from
"new_objfile".

Some existing users of new_objfile do nothing if the passed objfile is
nullptr.  For them, we can simply drop the nullptr check.  For others,
add a new all_objfiles_removed callback, and refactor things a bit to
keep the existing behavior as much as possible.

Some callbacks relied on current_program_space, and following
the refactoring now use either objfile->pspace or the pspace passed to
all_objfiles_removed.  I think this should be relatively safe, and in
general a step in the right direction.

On the notify side, I found only one call site to change from
new_objfile to all_objfiles_removed, in clear_symtab_users.  It is not
entirely clear to me that this is entirely correct.  clear_symtab_users
appears to be called in spots that don't remove all objfiles
(functions finish_new_objfile, remove_symbol_file_command, reread_symbols,
do_module_cleanups).  But I think that this patch at least makes the
current code clearer.

[1] https://gitlab.com/gnutools/binutils-gdb/-/commit/a0a031bce0527b1521788b5dad640e7883b3a252

Change-Id: Icb648f72862e056267f30f44dd439bd4ec766f13
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00
Simon Marchi 74ce4f8ecf gdb: add program_space parameters to some auto-load functions
Make the current_program_space references bubble up a bit.

Change-Id: Id047a48cc8d8a45504cdbb5960bafe3e7735d652
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00
Simon Marchi eb0558dee5 gdb: use objfile->pspace in auto-load.c
Use objfile->pspace instead of current_program_space in two spots.

Change-Id: Idf94fad486252d1250380f295e71b0fe76dce76c
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00
Simon Marchi aa9be61e7d gdb: add program_space parameter to emit_clear_objfiles_event
Add program_space space parameters to emit_clear_objfiles_event and
create_clear_objfiles_event_object, making the reference to
current_program_space bubble up a bit.

Change-Id: I5fde2071712781e5d45971fa0ab34d85d3a49a71
Approved-By: Tom Tromey <tom@tromey.com>
2023-10-05 13:20:50 -04:00