Tom Tromey [Sat, 21 Jan 2023 21:00:05 +0000 (14:00 -0700)]
Don't include block.h from expop.h
expop.h needs block.h for a single inline function. However, I don't
think most of the check_objfile functions need to be defined in the
header (just the templates). This patch moves the one offending
function and removes the include.
Pedro Alves [Fri, 27 Jan 2023 18:07:56 +0000 (18:07 +0000)]
Simplify interp::exec / interp_exec - let exceptions propagate
This patch implements a simplication that I suggested here:
https://sourceware.org/pipermail/gdb-patches/2022-March/186320.html
Currently, the interp::exec virtual method interface is such that
subclass implementations must catch exceptions and then return them
via normal function return.
However, higher up the in chain, for the CLI we get to
interpreter_exec_cmd, which does:
for (i = 1; i < nrules; i++)
{
struct gdb_exception e = interp_exec (interp_to_use, prules[i]);
if (e.reason < 0)
{
interp_set (old_interp, 0);
error (_("error in command: \"%s\"."), prules[i]);
}
}
and for MI we get to mi_cmd_interpreter_exec, which has:
void
mi_cmd_interpreter_exec (const char *command, char **argv, int argc)
{
...
for (i = 1; i < argc; i++)
{
struct gdb_exception e = interp_exec (interp_to_use, argv[i]);
if (e.reason < 0)
error ("%s", e.what ());
}
}
Note that if those errors are reached, we lose the original
exception's error code. I can't see why we'd want that.
And, I can't see why we need to have interp_exec catch the exception
and return it via the normal return path. That's normally needed when
we need to handle propagating exceptions across C code, like across
readline or ncurses, but that's not the case here.
It seems to me that we can simplify things by removing some
try/catch-ing and just letting exceptions propagate normally.
Note, the "error in command" error shown above, which only exists in
the CLI interpreter-exec command, is only ever printed AFAICS if you
run "interpreter-exec console" when the top level interpreter is
already the console/tui. Like:
(gdb) interpreter-exec console "foobar"
Undefined command: "foobar". Try "help".
error in command: "foobar".
You won't see it with MI's "-interpreter-exec console" from a top
level MI interpreter:
(gdb)
-interpreter-exec console "foobar"
&"Undefined command: \"foobar\". Try \"help\".\n"
^error,msg="Undefined command: \"foobar\". Try \"help\"."
(gdb)
nor with MI's "-interpreter-exec mi" from a top level MI interpreter:
(gdb)
-interpreter-exec mi "-foobar"
^error,msg="Undefined MI command: foobar",code="undefined-command"
^done
(gdb)
in both these cases because MI's -interpreter-exec just does:
error ("%s", e.what ());
You won't see it either when running an MI command with the CLI's
"interpreter-exec mi":
(gdb) interpreter-exec mi "-foobar"
^error,msg="Undefined MI command: foobar",code="undefined-command"
(gdb)
This last case is because MI's interp::exec implementation never
returns an error:
gdb_exception
mi_interp::exec (const char *command)
{
mi_execute_command_wrapper (command);
return gdb_exception ();
}
Thus I think that "error in command" error is pretty pointless, and
since it simplifies things to not have it, the patch just removes it.
The patch also ends up addressing an old FIXME.
Change-Id: I5a6432a80496934ac7127594c53bf5221622e393
Approved-By: Tom Tromey <tromey@adacore.com>
Approved-By: Kevin Buettner <kevinb@redhat.com>
Tom Tromey [Thu, 19 Jan 2023 21:01:27 +0000 (14:01 -0700)]
Avoid FAILs in gdb.compile
Many gdb.compile C++ tests fail for me on Fedora 36. I think these
are largely bugs in the plugin, though I didn't investigate too
deeply. Once one failure is seen, this often cascades and sometimes
there are many timeouts.
For example, this can happen:
(gdb) compile code var = a->get_var ()
warning: Could not find symbol "_ZZ9_gdb_exprP10__gdb_regsE1a" for compiled module "/tmp/gdbobj-0xdI6U/out2.o".
1 symbols were missing, cannot continue.
I think this is probably a plugin bug because, IIRC, in theory these
symbols should be exempt from a lookup via gdb.
This patch arranges to catch any catastrophic failure and then simply
exit the entire .exp file.
Tom Tromey [Thu, 19 Jan 2023 18:19:32 +0000 (11:19 -0700)]
Don't let .gdb_history file cause failures
I had a .gdb_history file in my testsuite directory in the build tree,
and this provoked a failure in gdbhistsize-history.exp. It seems
simple to prevent this file from causing a failure.
Tom Tromey [Fri, 13 Jan 2023 16:59:29 +0000 (09:59 -0700)]
Merge fixup_section and fixup_symbol_section
fixup_symbol_section delegates all its work to fixup_section, so merge
the two.
Because there is only a single caller to fixup_symbol_section, we can
also remove some of the introductory logic. For example, this will
never be called with a NULL objfile any more.
The LOC_BLOCK case can be removed, because such symbols are handled by
the buildsym code now.
Finally, a symbol can only appear in a SEC_ALLOC section, so the loop
is modified to skip sections that do not have this flag set.
Tom Tromey [Fri, 13 Jan 2023 16:27:54 +0000 (09:27 -0700)]
Remove most calls to fixup_symbol_section
Nearly every call to fixup_symbol_section in gdb is incorrect, and if
any such call has an effect, it's purely by happenstance.
fixup_section has a long comment explaining that the call should only
be made before runtime section offsets are applied. And, the loop in
this code (the fallback loop -- the minsym lookup code is "ok") is
careful to remove these offsets before comparing addresses.
However, aside from a single call in dwarf2/read.c, every call in gdb
is actually done after section offsets have been applied. So, these
calls are incorrect.
Now, these calls could be made when the symbol is created. I
considered this approach, but I reasoned that the code has been this
way for many years, seemingly without ill effect. So, instead I chose
to simply remove the offending calls.
Tom Tromey [Fri, 13 Jan 2023 16:17:27 +0000 (09:17 -0700)]
Set section index when setting a symbol's block
When a symbol's block is set, the block has the runtime section offset
applied. So, it seems to me that the symbol implicitly is in the same
section as the block. Therefore, this patch sets the symbol's section
index at this same spot.
Tom Tromey [Thu, 19 Jan 2023 13:14:49 +0000 (06:14 -0700)]
Remove compunit_symtab::m_block_line_section
The previous patch hard-coded SECT_OFF_TEXT into the buildsym code.
After this, it's clear that there is only one caller of
compunit_symtab::set_block_line_section, and it always passes
SECT_OFF_TEXT. So, remove compunit_symtab::m_block_line_section and
use SECT_OFF_TEXT instead.
Tom Tromey [Fri, 13 Jan 2023 16:08:41 +0000 (09:08 -0700)]
Do not pass section index to end_compunit_symtab
Right now, the section index passed to end_compunit_symtab is always
SECT_OFF_TEXT. Remove this parameter and simply always use
SECT_OFF_TEXT.
Tom Tromey [Fri, 13 Jan 2023 15:57:08 +0000 (08:57 -0700)]
Set section indices when symbols are made
Most places in gdb that create a new symbol will apply a section
offset to the address. It seems to me that the choice of offset here
is also an implicit choice of the section. This is particularly true
if you examine fixup_section, which notes that it must be called
before such offsets are applied -- meaning that if any such call has
an effect, it's purely by accident.
This patch cleans up this area by tracking the section index and
applying it to a symbol when the address is set. This is done for
nearly every case -- the remaining cases will be handled in later
patches.
Tom Tromey [Tue, 10 Jan 2023 18:39:50 +0000 (11:39 -0700)]
Use default section indexes in fixup_symbol_section
If fixup_section does not find a matching section, it arbitrarily
chooses the first one. However, it seems better to make this default
depend on the type of the symbol -- i.e., default data symbols to
.data and text symbols to .text.
I've also made fixup_section static, as it only has one caller.
Tom Tromey [Wed, 1 Feb 2023 18:43:02 +0000 (11:43 -0700)]
Simplify checks of cooked_index
This changes the cooked_index_functions to avoid an extra null check
now that checked_static_cast allows a null argument.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Tom de Vries [Wed, 8 Feb 2023 12:46:17 +0000 (13:46 +0100)]
[gdb/testsuite] Use maint ignore-probes in gdb.base/longjmp.exp
Test-case gdb.base/longjmp.exp handles both the case that there is a libc
longjmp probe, and the case that there isn't.
However, it only tests one of the two cases.
Use maint ignore-probes to test both cases, if possible.
Tested on x86_64-linux.
Tom de Vries [Wed, 8 Feb 2023 10:48:53 +0000 (11:48 +0100)]
[gdb/testsuite] Use maint ignore-probes in gdb.base/solib-corrupted.exp
Test-case gdb.base/solib-corrupted.exp only works for a glibc without probes
interface, otherwise we run into:
...
XFAIL: gdb.base/solib-corrupted.exp: info probes
UNTESTED: gdb.base/solib-corrupted.exp: GDB is using probes
...
Fix this by using maint ignore-probes to simulate the absence of the relevant
probes.
Also, it requires glibc debuginfo, and if not present, it produces an XFAIL:
...
XFAIL: gdb.base/solib-corrupted.exp: make solibs looping
UNTESTED: gdb.base/solib-corrupted.exp: no _r_debug symbol has been found
...
This is incorrect, because an XFAIL indicates a known problem in the
environment. In this case, there is no problem: the environment is
functioning as expected when glibc debuginfo is not installed.
Fix this by using UNSUPPORTED instead, and make the message less cryptic:
...
UNSUPPORTED: gdb.base/solib-corrupted.exp: make solibs looping \
(glibc debuginfo required)
...
Finally, with glibc debuginfo present, we run into:
...
(gdb) PASS: gdb.base/solib-corrupted.exp: make solibs looping
info sharedlibrary^M
warning: Corrupted shared library list: 0x7ffff7ffe750 != 0x0^M
From To Syms Read Shared Object Library^M
0x00007ffff7dd4170 0x00007ffff7df4090 Yes /lib64/ld-linux-x86-64.so.2^M
(gdb) FAIL: gdb.base/solib-corrupted.exp: corrupted list \
(shared library list corrupted)
...
due to commit
44288716537 ("gdb, testsuite: extend gdb_test_multiple checks").
Fix this by rewriting into gdb_test_multiple and using -early.
Tested on x86_64-linux, with and without glibc debuginfo installed.
Vladimir Mezentsev [Tue, 7 Feb 2023 22:58:25 +0000 (14:58 -0800)]
gprofng: fix SIGSEGV when processing unusual dwarf
gprofng/ChangeLog
2023-02-07 Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
PR gprofng/30093
* src/Dwarf.cc: add nullptr check.
* src/DwarfLib.cc: Likewise.
Alan Modra [Wed, 8 Feb 2023 00:23:59 +0000 (10:53 +1030)]
Re: Resetting section vma after _bfd_dwarf2_find_nearest_line
f.bfd_ptr is set too early to be a reliable indicator of good debug
info.
* dwarf2.c (_bfd_dwarf2_slurp_debug_info): Correct test for
debug info being previously found.
GDB Administrator [Wed, 8 Feb 2023 00:00:26 +0000 (00:00 +0000)]
Automatic date update in version.in
Andrew Burgess [Mon, 7 Nov 2022 17:18:55 +0000 (17:18 +0000)]
gdb: fix display of thread condition for multi-location breakpoints
This commit addresses the issue in PR gdb/30087.
If a breakpoint with multiple locations has a thread condition, then
the 'info breakpoints' output is a little messed up, here's an example
of the current output:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE> thread 1
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32 thread 1
stop only in thread 1
Notice that, at the end of the location for breakpoint 3, the 'thread
1' condition is printed, but this is then repeated on the next line
with 'stop only in thread 1'.
In contrast, for breakpoint 2, the 'thread 1' appears randomly, in the
"What" column, though slightly offset, non of the separate locations
have the 'thread 1' information. Additionally for breakpoint 2 we
also get a 'stop only in thread 1' line.
There's two things going on here. First the randomly placed 'thread
1' for breakpoint 2 is due to a bug in print_one_breakpoint_location,
where we check the variable part_of_multiple instead of
header_of_multiple.
If I fix this oversight, then the output is now:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25 thread 1
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32 thread 1
stop only in thread 1
The 'thread 1' condition is now displayed at the end of each location,
which makes the output the same for single location breakpoints and
multi-location breakpoints.
However, there's still some duplication here. Both breakpoints 2 and
3 include a 'stop only in thread 1' line, and it feels like the
additional 'thread 1' is redundant. In fact, there's a comment to
this very effect in the code:
/* FIXME: This seems to be redundant and lost here; see the
"stop only in" line a little further down. */
So, lets fix this FIXME. The new plan is to remove all the trailing
'thread 1' markers from the CLI output, we now get this:
(gdb) break foo thread 1
Breakpoint 2 at 0x401114: foo. (3 locations)
(gdb) break bar thread 1
Breakpoint 3 at 0x40110a: file /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c, line 32.
(gdb) info breakpoints
Num Type Disp Enb Address What
2 breakpoint keep y <MULTIPLE>
stop only in thread 1
2.1 y 0x0000000000401114 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.2 y 0x0000000000401146 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
2.3 y 0x0000000000401168 in foo at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:25
3 breakpoint keep y 0x000000000040110a in bar at /tmp/src/gdb/testsuite/gdb.base/thread-bp-multi-loc.c:32
stop only in thread 1
All of the above points are also true for the Ada 'task' breakpoint
condition, and the changes I've made also update how the task
information is printed, though in the case of the Ada task there was
no 'stop only in task XXX' line printed, so I've added one of those.
Obviously it can't be quite that easy. For MI backwards compatibility
I've retained the existing code (but now only for MI like outputs),
which ensures we should generate backwards compatible output.
I've extended an Ada test to cover the new task related output, and
updated all the tests I could find that checked for the old output.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30087
Approved-By: Pedro Alves <pedro@palves.net>
Nick Clifton [Tue, 7 Feb 2023 11:40:46 +0000 (11:40 +0000)]
Fix documentation of the 'n' symbol type displayed by nm.
PR 30080 * doc/binutils.texi (nm): Update description of the 'n' symbol type.
Tom de Vries [Tue, 7 Feb 2023 10:41:44 +0000 (11:41 +0100)]
[gdb/testsuite] Improve untested message in gdb.ada/finish-var-size.exp
I came across:
...
UNTESTED: gdb.ada/finish-var-size.exp: GCC too told for this test
...
The message only tells us that the compiler version too old, not what compiler
version is required.
Fix this by rewriting using required:
...
UNSUPPORTED: gdb.ada/finish-var-size.exp: require failed: \
expr [gcc_major_version] >= 12
...
Tested on x86_64-linux.
GDB Administrator [Tue, 7 Feb 2023 00:00:16 +0000 (00:00 +0000)]
Automatic date update in version.in
Simon Marchi [Mon, 6 Feb 2023 19:12:27 +0000 (14:12 -0500)]
gdb: adjust comment on target_desc_info::from_user_p
Remove the stale reference to INFO, which is now "this target
description info" now.
Change-Id: I35dbdb089048ed7cfffe730d3134ee391b176abf
Andrew Burgess [Thu, 2 Feb 2023 11:45:41 +0000 (11:45 +0000)]
gdb/doc: extend the documentation for the 'handle' command
The documentation for the 'handle' command does not cover all of the
features of the command, and in one case, is just wrong.
The user can specify 'all' as signal name, the documentation implies
that this will change the behaviour of all signals, in reality, this
changes all signals except SIGINT and SIGTRAP (the signals used by
GDB). I've updated the docs to list this limitation.
The 'handle' command also allows the user to specify multiple signals
for a single command, e.g. 'handle SIGFPE SIGILL nostop pass print',
however the documentation doesn't describe this, so I've updated the
docs to describe this feature.
Alan Modra [Mon, 6 Feb 2023 02:16:52 +0000 (12:46 +1030)]
ppc32 and "LOAD segment with RWX permissions"
When using a bss-plt we'll always trigger the RWX warning, which
disturbs gcc test results. On the other hand, there may be reason to
want the warning when gcc is configured with --enable-secureplt.
So turning off the warning entirely for powerpc might not be the best
solution. Instead, we'll turn off the warning whenever a bss-plt is
generated, unless the user explicitly asked for the warning.
bfd/
* elf32-ppc.c (ppc_elf_select_plt_layout): Set
no_warn_rwx_segments on generating a bss plt, unless explicity
enabled by the user. Also show the bss-plt warning when
--warn-rwx-segments is given without --bss-plt.
include/
* bfdlink.h (struct bfd_link_info): Add user_warn_rwx_segments.
ld/
* lexsup.c (parse_args): Set user_warn_rwx_segments.
* testsuite/ld-elf/elf.exp: Pass --secure-plt for powerpc to
the rwx tests.
Tom de Vries [Mon, 6 Feb 2023 11:52:50 +0000 (12:52 +0100)]
[gdb/testsuite] Fix gdb.threads/schedlock.exp on fast cpu
Occasionally, I run into:
...
(gdb) PASS: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
set scheduler-locking on
continue^M
Continuing.^M
PASS: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
continue (with lock)
[Thread 0x7ffff746e700 (LWP 1339) exited]^M
No unwaited-for children left.^M
(gdb) Quit^M
(gdb) FAIL: gdb.threads/schedlock.exp: schedlock=on: cmd=continue: \
stop all threads (with lock) (timeout)
...
What happens is that this loop which is supposed to run "just short of forever":
...
/* Don't run forever. Run just short of it :) */
while (*myp > 0)
{
/* schedlock.exp: main loop. */
MAYBE_CALL_SOME_FUNCTION(); (*myp) ++;
}
...
finishes after 0x7fffffff iterations (when a signed wrap occurs), which on my
system takes only about 1.5 seconds.
Fix this by:
- changing the pointed-at type of myp from signed to unsigned, which makes the
wrap defined behaviour (and which also make the loop run twice as long,
which is already enough to make it impossible for me to reproduce the FAIL.
But let's try to solve this more structurally).
- changing the pointed-at type of myp from int to long long, making the wrap
unlikely.
- making sure the loop runs forever, by setting the loop condition to 1.
- making sure the loop still contains different lines (as far as debug info is
concerned) by incrementing a volatile counter in the loop.
- making sure the program doesn't run forever in case of trouble, by adding an
"alarm (30)".
Tested on x86_64-linux.
PR testsuite/30074
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30074
Andrew Burgess [Wed, 9 Nov 2022 12:54:55 +0000 (12:54 +0000)]
gdb: error if 'thread' or 'task' keywords are overused
When creating a breakpoint or watchpoint, the 'thread' and 'task'
keywords can be used to create a thread or task specific breakpoint or
watchpoint.
Currently, a thread or task specific breakpoint can only apply for a
single thread or task, if multiple threads or tasks are specified when
creating the breakpoint (or watchpoint), then the last specified id
will be used.
The exception to the above is that when the 'thread' keyword is used
during the creation of a watchpoint, GDB will give an error if
'thread' is given more than once.
In this commit I propose making this behaviour consistent, if the
'thread' or 'task' keywords are used more than once when creating
either a breakpoint or watchpoint, then GDB will give an error.
I haven't updated the manual, we don't explicitly say that these
keywords can be repeated, and (to me), given the keyword takes a
single id, I don't think it makes much sense to repeat the keyword.
As such, I see this more as adding a missing error to GDB, rather than
making some big change. However, I have added an entry to the NEWS
file as I guess it is possible that some people might hit this new
error with an existing (I claim, badly written) GDB script.
I've added some new tests to check for the new error.
Just one test needed updating, gdb.linespec/keywords.exp, this test
did use the 'thread' keyword twice, and expected the breakpoint to be
created. Looking at what this test was for though, it was checking
the use of '-force-condition', and I don't think that being able to
repeat 'thread' was actually a critical part of this test.
As such, I've updated this test to expect the error when 'thread' is
repeated.
Alan Modra [Sat, 4 Feb 2023 00:59:05 +0000 (11:29 +1030)]
Resetting section vma after _bfd_dwarf2_find_nearest_line
There are failure paths in _bfd_dwarf2_slurp_debug_info that can
result in altered section vmas. Also, when setting ET_REL section
vmas it's not too difficult to handle cases where the original vma was
non-zero, so do that too.
This patch was really in response to an addr2line buffer overflow
processing a fuzzed mips relocatable object file. The file had a
number of .debug_info sections with relocations that included lo16 and
hi16 relocs, and in that order. At least one section VMA was
non-zero. This resulted in processing of DWARF info twice, once via
the call to _bfd_dwarf2_find_nearest_line in
_bfd_mips_elf_find_nearest_line, and because that failed leaving VMAs
altered, the second via the call in _bfd_elf_find_nearest_line. The
first call left entries on mips_hi16_list pointing at buffers
allocated during the first call, the second call processed the
mips_hi16_list after the buffers had been freed. (At least when
running with asan and under valgrind. Under gdb with a non-asan
addr2line the second call allocated exactly the same buffer and the
bug didn't show.) Now I don't really care too much what happens with
fuzzed files, but the logic in _bfd_dwarf2_find_nearest_line is meant
to result in only one read of .debug_info, not multiple reads of the
same info when there are errors. This patch fixes that problem.
* dwarf2.c (struct adjusted_section): Add orig_vma.
(unset_sections): Reset vma to it.
(place_sections): Handle non-zero vma too. Save orig_vma.
(_bfd_dwarf2_slurp_debug_info): Tidy. Correct outdated comment.
On error returns after calling place_sections, call
unset_sections.
(_bfd_dwarf2_find_nearest_line_with_alt): Simplify call to
unset_sections.
Romain Geissler [Sun, 5 Feb 2023 13:56:34 +0000 (13:56 +0000)]
[PR 30082] Pass $JANSSON_LIBS and $ZSTD_LIBS to ld-bootstrap/bootrap.exp
GDB Administrator [Mon, 6 Feb 2023 00:00:11 +0000 (00:00 +0000)]
Automatic date update in version.in
GDB Administrator [Sun, 5 Feb 2023 00:00:08 +0000 (00:00 +0000)]
Automatic date update in version.in
Andrew Burgess [Thu, 24 Nov 2022 19:36:23 +0000 (19:36 +0000)]
gdb/testsuite: don't try to set non-stop mode on a running target
The test gdb.threads/thread-specific-bp.exp tries to set non-stop mode
on a running target, something which the manual makes clear is not
allowed.
This commit restructures the test a little, we now set the non-stop
mode as part of the GDBFLAGS, so the mode will be set before GDB
connects to the target. As a consequence I'm able to move the
with_test_prefix out of the check_thread_specific_breakpoint proc.
The check_thread_specific_breakpoint proc is now called within a loop.
After this commit the gdb.threads/thread-specific-bp.exp test still
has some failures, this is because of an issue GDB currently has
printing "Thread ... exited" messages. This problem should be
addressed by this patch:
https://sourceware.org/pipermail/gdb-patches/2022-December/194694.html
when it is merged.
Dimitar Dimitrov [Sun, 29 Jan 2023 09:52:52 +0000 (11:52 +0200)]
ld: pru: Add optional section alignments
The Texas Instruments SoCs with AARCH64 host processors have stricter
alignment requirements than ones with ARM32 host processors. It's not
only the requirement for resource_table to be aligned to 8. But also
any loadable segment size must be a multiple of 4 [1].
The current PRU default linker script may output a segment size not
aligned to 4, which would cause firmware load failure on AARCH64 hosts.
Fix this by using COMMONPAGESIZE and MAXPAGESIZE to signify respectively
the section memory size requirement and the resource table section's
start address alignment. This would avoid penalizing the ARM32 hosts,
for which the default values (1 and 1) are sufficient.
For AARCH64 hosts, the alignments would be overwritten from GCC spec
files using the linker command line, e.g.:
-z common-page-size=4 -z max-page-size=8
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/remoteproc/pru_rproc.c?h=v6.1#n555
ld/ChangeLog:
* scripttempl/pru.sc (_data_end): Remove the alignment.
(.data): Align output section size to COMMONPAGESIZE.
(.resource_table): Ditto.
Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
Dimitar Dimitrov [Thu, 26 Jan 2023 19:52:45 +0000 (21:52 +0200)]
ld: pru: Merge the bss input sections into data
The popular method to load PRU firmware is through the remoteproc Linux
kernel driver. In order to save a few bytes from the firmware, the PRU
CRT0 is spared from calling memset for the bss segment [1]. Instead the
host loader is supposed to zero out the bss segment. This is important
for PRU, which typically has only 8KB for instruction memory.
The legacy non-mainline PRU host driver relied on the default
behaviour of the kernel core remoteproc [2]. That default is to zero
out the loadable memory regions not backed by file storage (i.e. the
bss sections). This worked for the libgloss' CRT0.
But the PRU loader merged in mainline Linux explicitly changes the
default behaviour [3]. It no longer is zeroing out memory regions.
Hence the bss sections are not initialized - neither by CRT0, nor by the
host loader.
This patch fixes the issue by aligning the GNU LD default linker script
with the mainline Linux kernel expectation. Since the mainline kernel
driver is submitted by the PRU manufacturer itself (Text Instruments),
we can consider that as defining the ABI.
This change has been tested on Beaglebone AI-64 [4]. Static counter
variables in the firmware are now always starting from zero, as
expected. There was only one new toolchain test failure in orphan3.d,
due to reordering of the output sections. I believe this is a harmless
issue. I could not rewrite the PASS criteria to ignore the output
section ordering, so I have disabled that test case for PRU.
[1] https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=libgloss/pru/crt0.S;h=
b3f0d53a93acc372f461007553e7688ca77753c9;hb=HEAD#l40
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/remoteproc/remoteproc_elf_loader.c?h=v6.1#n228
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/remoteproc/pru_rproc.c?h=v6.1#n641
[4] https://beagleboard.org/ai-64
ld/ChangeLog:
* scripttempl/pru.sc (.data): Merge .bss input sections into the
.data output section.
* testsuite/ld-elf/orphan3.d: Disable for PRU.
Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
GDB Administrator [Sat, 4 Feb 2023 00:00:09 +0000 (00:00 +0000)]
Automatic date update in version.in
Guillermo E. Martinez [Fri, 3 Feb 2023 17:17:49 +0000 (11:17 -0600)]
bpf: fix error conversion from long unsigned int to unsigned int [-Werror=overflow]
Regenerating BPF target using the maintainer mode emits:
.../opcodes/bpf-opc.c:57:11: error: conversion from ‘long unsigned int’ to ‘unsigned int’ changes value from ‘
18446744073709486335’ to ‘
4294902015’ [-Werror=overflow]
57 | 64, 64, 0xffffffffffff00ff, { { F (F_IMM32) }, { F (F_OFFSET16) }, { F (F_SRCLE) }, { F (F_OP_CODE) }, { F (F_DSTLE) }, { F (F_OP_SRC) }, { F (F_OP_CLASS) }, { 0 } }
The use of a narrow size to handle the mask CGEN in instruction format
is causing this error. Additionally eBPF `call' instructions
constructed by expressions using symbols (BPF_PSEUDO_CALL) emits
annotations in `src' field of the instruction, used to identify BPF
target endianness.
cpu/
* bpf.cpu (define-call-insn): Remove `src' field from
instruction mask.
include/
*opcode/cge.h (CGEN_IFMT): Adjust mask bit width.
opcodes/
* bpf-opc.c: Regenerate.
Simon Marchi [Fri, 3 Feb 2023 14:21:26 +0000 (09:21 -0500)]
gdb: make target_desc_info_from_user_p a method of target_desc_info
Move the implementation over to target_desc_info. Remove the
target_desc_info forward declaration in target-descriptions.h, it's no
longer needed.
Change-Id: Ic95060341685afe0b73af591ca6efe32f5e7e892
Simon Marchi [Fri, 3 Feb 2023 14:21:25 +0000 (09:21 -0500)]
gdb: remove copy_inferior_target_desc_info
This function is now trivial, we can just copy inferior::tdesc_info
where needed.
Change-Id: I25185e2cd4ba1ef24a822d9e0eebec6e611d54d6
Simon Marchi [Fri, 3 Feb 2023 14:21:24 +0000 (09:21 -0500)]
gdb: remove get_tdesc_info
Remove this function, since it's now a trivial access to
inferior::tdesc_info.
Change-Id: I3e88a8214034f1a4163420b434be11f51eef462c
Simon Marchi [Fri, 3 Feb 2023 14:21:23 +0000 (09:21 -0500)]
gdb: change inferior::tdesc_info to non-pointer
I initially made this field a unique pointer, to have automatic memory
management. But I then thought that the field didn't really need to be
allocated separately from struct inferior. So make it a regular
non-pointer field of inferior.
Remove target_desc_info_free, as it's no longer needed.
Change-Id: Ica2b97071226f31c40e86222a2f6922454df1229
Simon Marchi [Fri, 3 Feb 2023 14:21:22 +0000 (09:21 -0500)]
gdb: move target_desc_info to inferior.h
In preparation for the following patch, where struct inferior needs to
"see" struct target_desc_info, move target_desc_info to the header file.
I initially moved the structure to target-descriptions.h, and later made
inferior.h include target-descriptions.h. This worked, but it then
occured to me that target_desc_info is really an inferior property that
involves a target description, so I think it makes sense to have it in
inferior.h.
Change-Id: I3e81d04faafcad431e294357389f3d4c601ee83d
Simon Marchi [Fri, 3 Feb 2023 13:23:32 +0000 (08:23 -0500)]
gdb: use assignment to initialize variable in tdesc_parse_xml
Since allocate_target_description returns a target_desc_up, use
assignment to initialize the description variable.
Change-Id: Iab3311642c09b95648984f305936f4a4cde09440
Jan Beulich [Fri, 3 Feb 2023 07:23:05 +0000 (08:23 +0100)]
x86: drop LOCK from XCHG when optimizing
Like with segment overrides on LEA, optimize away such a redundant
instruction prefix.
Jan Beulich [Fri, 3 Feb 2023 07:22:35 +0000 (08:22 +0100)]
x86-64: respect {nooptimize} when building VEX prefix
Swapping operands for commutative insns occurs outside of
optimize_encoding() and hence needs explicit checking for a request to
avoid any optimizations.
Jan Beulich [Fri, 3 Feb 2023 07:22:12 +0000 (08:22 +0100)]
x86: respect {nooptimize} for LEA
Dropping a meaningless segment prefix occurs outside of
optimize_encoding() and hence needs explicit checking for a request to
avoid any optimizations.
Jan Beulich [Fri, 3 Feb 2023 07:21:11 +0000 (08:21 +0100)]
x86-64: respect MOVABS when choosing alternative encodings
The alternative encoding is valid for MOV, but there's no such thing for
MOVABS.
Jan Beulich [Fri, 3 Feb 2023 07:20:32 +0000 (08:20 +0100)]
RISC-V: don't disassemble unrecognized insns as .byte
Insn width granularity being 16 bits, producing byte granular output
isn't very useful. With there being a way to specific otherwise
unknown insns to the assembler, use that same representation (to be
precise: its <length>,<encoding> flavor) for disassembly.
Alan Modra [Thu, 2 Feb 2023 12:09:31 +0000 (22:39 +1030)]
Add ECOFF Symbolic Header sanity checks
Anti-fuzzer measures. The checks don't ensure the various elements in
the header are distinct, but that isn't important as far as making
sure we don't overrun the buffer containing all the elements. Also,
we now don't care about offsets where the corresponding count is zero.
* ecoff.c (_bfd_ecoff_slurp_symbolic_info): Sanity check offsets
in debug->symbolic_header.
GDB Administrator [Fri, 3 Feb 2023 00:00:08 +0000 (00:00 +0000)]
Automatic date update in version.in
Simon Marchi [Tue, 3 Jan 2023 20:07:07 +0000 (15:07 -0500)]
gdb: initial support for ROCm platform (AMDGPU) debugging
This patch adds the foundation for GDB to be able to debug programs
offloaded to AMD GPUs using the AMD ROCm platform [1]. The latest
public release of the ROCm release at the time of writing is 5.4, so
this is what this patch targets.
The ROCm platform allows host programs to schedule bits of code for
execution on GPUs or similar accelerators. The programs running on GPUs
are typically referred to as `kernels` (not related to operating system
kernels).
Programs offloaded with the AMD ROCm platform can be written in the HIP
language [2], OpenCL and OpenMP, but we're going to focus on HIP here.
The HIP language consists of a C++ Runtime API and kernel language.
Here's an example of a very simple HIP program:
#include "hip/hip_runtime.h"
#include <cassert>
__global__ void
do_an_addition (int a, int b, int *out)
{
*out = a + b;
}
int
main ()
{
int *result_ptr, result;
/* Allocate memory for the device to write the result to. */
hipError_t error = hipMalloc (&result_ptr, sizeof (int));
assert (error == hipSuccess);
/* Run `do_an_addition` on one workgroup containing one work item. */
do_an_addition<<<dim3(1), dim3(1), 0, 0>>> (1, 2, result_ptr);
/* Copy result from device to host. Note that this acts as a synchronization
point, waiting for the kernel dispatch to complete. */
error = hipMemcpyDtoH (&result, result_ptr, sizeof (int));
assert (error == hipSuccess);
printf ("result is %d\n", result);
assert (result == 3);
return 0;
}
This program can be compiled with:
$ hipcc simple.cpp -g -O0 -o simple
... where `hipcc` is the HIP compiler, shipped with ROCm releases. This
generates an ELF binary for the host architecture, containing another
ELF binary with the device code. The ELF for the device can be
inspected with:
$ roc-obj-ls simple
1 host-x86_64-unknown-linux file://simple#offset=8192&size=0
1 hipv4-amdgcn-amd-amdhsa--gfx906 file://simple#offset=8192&size=34216
$ roc-obj-extract 'file://simple#offset=8192&size=34216'
$ file simple-offset8192-size34216.co
simple-offset8192-size34216.co: ELF 64-bit LSB shared object, *unknown arch 0xe0* version 1, dynamically linked, with debug_info, not stripped
^
amcgcn architecture that my `file` doesn't know about ----´
Running the program gives the very unimpressive result:
$ ./simple
result is 3
While running, this host program has copied the device program into the
GPU's memory and spawned an execution thread on it. The goal of this
GDB port is to let the user debug host threads and these GPU threads
simultaneously. Here's a sample session using a GDB with this patch
applied:
$ ./gdb -q -nx --data-directory=data-directory ./simple
Reading symbols from ./simple...
(gdb) break do_an_addition
Function "do_an_addition" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (do_an_addition) pending.
(gdb) r
Starting program: /home/smarchi/build/binutils-gdb-amdgpu/gdb/simple
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff5db7640 (LWP
1082911)]
[New Thread 0x7ffef53ff640 (LWP
1082913)]
[Thread 0x7ffef53ff640 (LWP
1082913) exited]
[New Thread 0x7ffdecb53640 (LWP
1083185)]
[New Thread 0x7ffff54bf640 (LWP
1083186)]
[Thread 0x7ffdecb53640 (LWP
1083185) exited]
[Switching to AMDGPU Wave 2:2:1:1 (0,0,0)/0]
Thread 6 hit Breakpoint 1, do_an_addition (a=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
b=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
out=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>) at simple.cpp:24
24 *out = a + b;
(gdb) info inferiors
Num Description Connection Executable
* 1 process
1082907 1 (native) /home/smarchi/build/binutils-gdb-amdgpu/gdb/simple
(gdb) info threads
Id Target Id Frame
1 Thread 0x7ffff5dc9240 (LWP
1082907) "simple" 0x00007ffff5e9410b in ?? () from /opt/rocm-5.4.0/lib/libhsa-runtime64.so.1
2 Thread 0x7ffff5db7640 (LWP
1082911) "simple" __GI___ioctl (fd=3, request=
3222817548) at ../sysdeps/unix/sysv/linux/ioctl.c:36
5 Thread 0x7ffff54bf640 (LWP
1083186) "simple" __GI___ioctl (fd=3, request=
3222817548) at ../sysdeps/unix/sysv/linux/ioctl.c:36
* 6 AMDGPU Wave 2:2:1:1 (0,0,0)/0 do_an_addition (
a=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
b=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
out=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>) at simple.cpp:24
(gdb) bt
Python Exception <class 'gdb.error'>: Unhandled dwarf expression opcode 0xe1
#0 do_an_addition (a=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
b=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>,
out=<error reading variable: DWARF-2 expression error: `DW_OP_regx' operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>) at simple.cpp:24
(gdb) continue
Continuing.
result is 3
warning: Temporarily disabling breakpoints for unloaded shared library "file:///home/smarchi/build/binutils-gdb-amdgpu/gdb/simple#offset=8192&size=67208"
[Thread 0x7ffff54bf640 (LWP
1083186) exited]
[Thread 0x7ffff5db7640 (LWP
1082911) exited]
[Inferior 1 (process
1082907) exited normally]
One thing to notice is the host and GPU threads appearing under
the same inferior. This is a design goal for us, as programmers tend to
think of the threads running on the GPU as part of the same program as
the host threads, so showing them in the same inferior in GDB seems
natural. Also, the host and GPU threads share a global memory space,
which fits the inferior model.
Another thing to notice is the error messages when trying to read
variables or printing a backtrace. This is expected for the moment,
since the AMD GPU compiler produces some DWARF that uses some
non-standard extensions:
https://llvm.org/docs/AMDGPUDwarfExtensionsForHeterogeneousDebugging.html
There were already some patches posted by Zoran Zaric earlier to make
GDB support these extensions:
https://inbox.sourceware.org/gdb-patches/
20211105113849.118800-1-zoran.zaric@amd.com/
We think it's better to get the basic support for AMD GPU in first,
which will then give a better justification for GDB to support these
extensions.
GPU threads are named `AMDGPU Wave`: a wave is essentially a hardware
thread using the SIMT (single-instruction, multiple-threads) [3]
execution model.
GDB uses the amd-dbgapi library [4], included in the ROCm platform, for
a few things related to AMD GPU threads debugging. Different components
talk to the library, as show on the following diagram:
+---------------------------+ +-------------+ +------------------+
| GDB | amd-dbgapi target | <-> | AMD | | Linux kernel |
| +-------------------+ | Debugger | +--------+ |
| | amdgcn gdbarch | <-> | API | <=> | AMDGPU | |
| +-------------------+ | | | driver | |
| | solib-rocm | <-> | (dbgapi.so) | +--------+---------+
+---------------------------+ +-------------+
- The amd-dbgapi target is a target_ops implementation used to control
execution of GPU threads. While the debugging of host threads works
by using the ptrace / wait Linux kernel interface (as usual), control
of GPU threads is done through a special interface (dubbed `kfd`)
exposed by the `amdgpu` Linux kernel module. GDB doesn't interact
directly with `kfd`, but instead goes through the amd-dbgapi library
(AMD Debugger API on the diagram).
Since it provides execution control, the amd-dbgapi target should
normally be a process_stratum_target, not just a target_ops. More
on that later.
- The amdgcn gdbarch (describing the hardware architecture of the GPU
execution units) offloads some requests to the amd-dbgapi library,
so that knowledge about the various architectures doesn't need to be
duplicated and baked in GDB. This is for example for things like
the list of registers.
- The solib-rocm component is an solib provider that fetches the list of
code objects loaded on the device from the amd-dbgapi library, and
makes GDB read their symbols. This is very similar to other solib
providers that handle shared libraries, except that here the shared
libraries are the pieces of code loaded on the device.
Given that Linux host threads are managed by the linux-nat target, and
the GPU threads are managed by the amd-dbgapi target, having all threads
appear in the same inferior requires the two targets to be in that
inferior's target stack. However, there can only be one
process_stratum_target in a given target stack, since there can be only
one target per slot. To achieve it, we therefore resort the hack^W
solution of placing the amd-dbgapi target in the arch_stratum slot of
the target stack, on top of the linux-nat target. Doing so allows the
amd-dbgapi target to intercept target calls and handle them if they
concern GPU threads, and offload to beneath otherwise. See
amd_dbgapi_target::fetch_registers for a simple example:
void
amd_dbgapi_target::fetch_registers (struct regcache *regcache, int regno)
{
if (!ptid_is_gpu (regcache->ptid ()))
{
beneath ()->fetch_registers (regcache, regno);
return;
}
// handle it
}
ptids of GPU threads are crafted with the following pattern:
(pid, 1, wave id)
Where pid is the inferior's pid and "wave id" is the wave handle handed
to us by the amd-dbgapi library (in practice, a monotonically
incrementing integer). The idea is that on Linux systems, the
combination (pid != 1, lwp == 1) is not possible. lwp == 1 would always
belong to the init process, which would also have pid == 1 (and it's
improbable for the init process to offload work to the GPU and much less
for the user to debug it). We can therefore differentiate GPU and
non-GPU ptids this way. See ptid_is_gpu for more details.
Note that we believe that this scheme could break down in the context of
containers, where the initial process executed in a container has pid 1
(in its own pid namespace). For instance, if you were to execute a ROCm
program in a container, then spawn a GDB in that container and attach to
the process, it will likely not work. This is a known limitation. A
workaround for this is to have a dummy process (like a shell) fork and
execute the program of interest.
The amd-dbgapi target watches native inferiors, and "attaches" to them
using amd_dbgapi_process_attach, which gives it a notifier fd that is
registered in the event loop (see enable_amd_dbgapi). Note that this
isn't the same "attach" as in PTRACE_ATTACH, but being ptrace-attached
is a precondition for amd_dbgapi_process_attach to work. When the
debugged process enables the ROCm runtime, the amd-dbgapi target gets
notified through that fd, and pushes itself on the target stack of the
inferior. The amd-dbgapi target is then able to intercept target_ops
calls. If the debugged process disables the ROCm runtime, the
amd-dbgapi target unpushes itself from the target stack.
This way, the amd-dbgapi target's footprint stays minimal when debugging
a process that doesn't use the AMD ROCm platform, it does not intercept
target calls.
The amd-dbgapi library is found using pkg-config. Since enabling
support for the amdgpu architecture (amdgpu-tdep.c) depends on the
amd-dbgapi library being present, we have the following logic for
the interaction with --target and --enable-targets:
- if the user explicitly asks for amdgcn support with
--target=amdgcn-*-* or --enable-targets=amdgcn-*-*, we probe for
the amd-dbgapi and fail if not found
- if the user uses --enable-targets=all, we probe for amd-dbgapi,
enable amdgcn support if found, disable amdgcn support if not found
- if the user uses --enable-targets=all and --with-amd-dbgapi=yes,
we probe for amd-dbgapi, enable amdgcn if found and fail if not found
- if the user uses --enable-targets=all and --with-amd-dbgapi=no,
we do not probe for amd-dbgapi, disable amdgcn support
- otherwise, amd-dbgapi is not probed for and support for amdgcn is not
enabled
Finally, a simple test is included. It only tests hitting a breakpoint
in device code and resuming execution, pretty much like the example
shown above.
[1] https://docs.amd.com/category/ROCm_v5.4
[2] https://docs.amd.com/bundle/HIP-Programming-Guide-v5.4
[3] https://en.wikipedia.org/wiki/Single_instruction,_multiple_threads
[4] https://docs.amd.com/bundle/ROCDebugger-API-Guide-v5.4
Change-Id: I591edca98b8927b1e49e4b0abe4e304765fed9ee
Co-Authored-By: Zoran Zaric <zoran.zaric@amd.com>
Co-Authored-By: Laurent Morichetti <laurent.morichetti@amd.com>
Co-Authored-By: Tony Tye <Tony.Tye@amd.com>
Co-Authored-By: Lancelot SIX <lancelot.six@amd.com>
Co-Authored-By: Pedro Alves <pedro@palves.net>
Simon Marchi [Wed, 30 Nov 2022 14:46:09 +0000 (09:46 -0500)]
gdb: make gdb_printing_disassembler::stream public
In the ROCm port, we need to access the underlying stream of a
gdb_printing_disassembler, so make it public. The reason we need to
access it is to know whether it supports style escape code. We then
pass that information to a temporary string_file we use while
symbolizing addresses.
Change-Id: Ib95755a4a45b8f6478787993e9f904df60dd8dc1
Approved-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Tue, 22 Nov 2022 18:18:43 +0000 (13:18 -0500)]
gdb/solib-svr4: don't disable probes interface if probe not found
In ROCm-GDB, we install an solib provider for the GPU code objects on
top of the svr4 provider for the host, in order to add solibs
representing the GPU code objects to the solib list containing the host
process' shared libraries. We override the target_so_ops::handle_event
function pointer with our own, in which we call svr4_so_ops.handle_event
(which contains svr4_handle_solib_event) manually. When the host
(un)loads a library, the ROCm part of handle_event is a no-op. When the
GPU (un)loads a code object, we want the host side (svr4) to be a no-op.
The problem is that when handle_event is called because of a GPU event,
svr4_handle_solib_event gets called while not stopped at an svr4
probe. It then assumes this means there's a problem with the probes
interface and disables it through the following sequence of events:
- solib_event_probe_at return nullptr
- svr4_handle_solib_event returns early
- the make_scope_exit callback calls disable_probes_interface
We could fix that by making the ROCm handle_event callback check if an
svr4 probe is that the stop address, and only call
svr4_so_ops.handle_event if so. However, it doesn't feel right to
include some svr4 implementation detail in the ROCm event handler.
Instead, this patch changes svr4_handle_solib_event to not assume it is
an error if called while not at an svr4 probe location, and therefore
not disable the probes interface. That just means moving the
make_scope_exit call below where we lookup the probe by pc.
Change-Id: Ie8ddf5beffa2e92b8ebfdd016454546252519244
Co-Authored-By: Lancelot SIX <lancelot.six@amd.com>
Simon Marchi [Mon, 3 Oct 2022 16:56:30 +0000 (12:56 -0400)]
gdb: add gdbarch_up
Add a gdbarch_up unique pointer type, that calls gdbarch_free on
deletion. This is used in the ROCm support patch at the end of this
series.
Change-Id: I4b808892d35d69a590ce83180f41afd91705b2c8
Approved-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Wed, 28 Sep 2022 18:35:26 +0000 (14:35 -0400)]
gdb: add inferior_pre_detach observable
Add an observable notified in target_detach just before calling the
detach method on the inferior's target stack. This allows observer to
do some work on the inferior while it's still ptrace-attached, in the
case of a native Linux inferior. Specifically, the amd-dbgapi target
will need it in order to call amd_dbgapi_process_detach before the
process gets ptrace-detached.
Change-Id: I28b6065e251012a4c2db8a600fe13ba31671e3c9
Approved-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Fri, 23 Sep 2022 15:55:32 +0000 (11:55 -0400)]
gdbsupport: add type definitions for pid, lwp and tid
A following patch will want to declare variables of the same type as
some ptid_t components. To make that easy (and avoid harcoding those
types everywhere), define some type definitions in the ptid_t struct for
each of them. Use them throughout ptid.h.
I initially used pid_t, lwp_t and tid_t, but there is the risk of some
system defining the pid_t type using a macro instead of a typedef, which
would break things. So, use the _type suffix instead.
Change-Id: I820b0bea9dafcb4914f1c9ba4bb96b5c666c8dec
Approved-By: Andrew Burgess <aburgess@redhat.com>
Pedro Alves [Fri, 23 Sep 2022 15:48:11 +0000 (11:48 -0400)]
gdb: make install_breakpoint return a non-owning reference
A following patch will want to install a breakpoint and then keep a
non-owning reference to it. Make install_breakpoint return a non-owning
reference, to make that easy.
Co-Authored-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I2e8106a784021ff276ce251e24708cbdccc2d479
Approved-By: Andrew Burgess <aburgess@redhat.com>
Lancelot SIX [Fri, 2 Sep 2022 19:09:35 +0000 (15:09 -0400)]
gdb: add supports_arch_info callback to gdbarch_register
In the ROCm GDB port, there are some amdgcn architectures known by BFD
that we don't actually support in GDB. We don't want
gdbarch_printable_names to return these architectures.
gdbarch_printable_names is used for a few things:
- completion of the "set architecture" command
- the gdb.architecture_names function in Python
- foreach-arch selftests
Add an optional callback to gdbarch_register that is a predicate
indicating whether the gdbarch supports the given bfd_arch_info. by
default, it is nullptr, meaning that the gdbarch accepts all "mach"s for
that architecture known by BFD.
Change-Id: I712f94351b0b34ed1f42e5cf7fc7ba051315d860
Co-Authored-By: Simon Marchi <simon.marchi@efficios.com>
Approved-By: Andrew Burgess <aburgess@redhat.com>
Tom de Vries [Thu, 2 Feb 2023 14:07:44 +0000 (15:07 +0100)]
[gas] Update .loc syntax comment in dwarf2dbg.c
I noticed that a comment in gas/dwarf2dbg.c describing .loc syntax was missing
the "view VALUE" option.
Fix this by adding the missing option.
Enze Li [Wed, 1 Feb 2023 14:35:18 +0000 (22:35 +0800)]
gdb: remove gdb_indent.sh
GDB has been converted to a C++ program for many years[1], and the
gdb_indent.sh will not be used any more. Therefore, remove the script as
obvious.
[1] https://sourceware.org/gdb/wiki/cxx-conversion
Approved-By: Simon Marchi <simark@simark.ca>
Indu Bhagat [Thu, 2 Feb 2023 08:49:44 +0000 (00:49 -0800)]
ld/doc: use "stack trace" instead of "unwind" for SFrame
SFrame format is meant for generating stack traces only.
ld/
* ld.texi: Replace the use of "unwind" with "stack trace".
Indu Bhagat [Thu, 2 Feb 2023 08:49:29 +0000 (00:49 -0800)]
bfd: use "stack trace" instead of "unwind" for SFrame
SFrame format is meant for generating stack traces only.
bfd/
* elf-bfd.h: Replace the use of "unwind" with "stack trace".
* elf-sframe.c: Likewise.
* elf64-x86-64.c: Likewise.
* elfxx-x86.c: Likewise.
include/
* elf/common.h: Likewise.
Indu Bhagat [Thu, 2 Feb 2023 08:48:59 +0000 (00:48 -0800)]
gas: use "stack trace" instead of "unwind" for SFrame
SFrame format is meant for generating stack traces only.
gas/
* as.c: Replace the use of "unwind" with "stack trace".
* config/tc-aarch64.c: Likewise.
* config/tc-aarch64.h: Likewise.
* config/tc-i386.c: Likewise.
* config/tc-i386.h: Likewise.
* gen-sframe.c: Likewise.
* gen-sframe.h: Likewise.
* testsuite/gas/cfi-sframe/cfi-sframe-aarch64-2.s: Likewise.
* testsuite/gas/cfi-sframe/cfi-sframe-common-8.s: Likewise.
* testsuite/gas/cfi-sframe/common-empty-2.s: Likewise.
* testsuite/gas/cfi-sframe/common-empty-3.s: Likewise.
Indu Bhagat [Thu, 2 Feb 2023 08:47:38 +0000 (00:47 -0800)]
sframe: use "stack trace" instead of "unwind" for SFrame
SFrame format is meant for generating stack traces only.
include/
* sframe.h: Fix comments in the header file.
Indu Bhagat [Thu, 2 Feb 2023 08:47:22 +0000 (00:47 -0800)]
libsframe/doc: use "stack trace" instead of "unwind" for SFrame
SFrame format is meant for generating stack traces only.
libsframe/
* doc/sframe-spec.texi: Use "stack trace" instead of "unwind".
Alan Modra [Wed, 1 Feb 2023 23:19:00 +0000 (09:49 +1030)]
ld-elf/merge test update
The merge test fais on numerous targets because they don't support the
necessary pc-relative relocs. This patch removes that part of the
merge test, and makes references to the merged strings from .data
rather than .text to better support targets that relax text by
default.
GDB Administrator [Thu, 2 Feb 2023 00:00:12 +0000 (00:00 +0000)]
Automatic date update in version.in
Alan Modra [Wed, 1 Feb 2023 13:04:16 +0000 (23:34 +1030)]
obj-elf.h BYTES_IN_WORD
Don't define this. It is defined just before elf-bfd.h is included,
but doesn't have any relevance there. Instead is for aout64.h where
the default is 4 anyway.
Alan Modra [Wed, 1 Feb 2023 12:41:30 +0000 (23:11 +1030)]
gas obj_end
Provide a way for config/obj-* to clean up at end of assembly, and do
so for ELF.
* obj.h (struct format_ops): Add "end".
* config/obj-aout.c (aout_format_ops): Init new field.
* config/obj-coff.c (coff_format_ops): Likewise.
* config/obj-ecoff.c (ecoff_format_ops): Likewise.
* config/obj-elf.c (elf_format_ops): Likewise.
(elf_begin): Move later in file. Clear some more variables.
(comment_section): Make file scope.
(free_section_idx): Rewrite.
(elf_adjust_symtab): Expand str_htab_create call and use
free_section_idx as delete function.
(elf_frob_file_after_relocs): Don't clean up groups.indexes here.
(elf_end): New function.
* config/obj-elf.h (obj_end): Define.
* config/obj-multi.h (obj_end): Define.
* output-file.c (output_file_close): Call obj_end.
Thiago Jung Bauermann [Thu, 18 Aug 2022 18:21:18 +0000 (18:21 +0000)]
gdbserver: Add PID parameter to linux_get_auxv and linux_get_hwcap
This patch doesn't change gdbserver behaviour, but after later changes are
made it avoids a null pointer dereference when HWCAP needs to be obtained
for a specific process while current_thread is nullptr.
Fixing linux_read_auxv, linux_get_hwcap and linux_get_hwcap2 to take a PID
parameter seems more correct than setting current_thread in one particular
code path.
Changes are propagated to allow passing the new parameter through the call
chain.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Thiago Jung Bauermann [Tue, 16 Aug 2022 17:18:47 +0000 (17:18 +0000)]
gdbserver: Add assert in find_register_by_number
It helped me during development, catching bugs closer to when they actually
happened.
Also remove the equivalent gdb_assert in regcache_raw_read_unsigned, since
it's checking the same condition a few frames above.
Suggested-By: Simon Marchi <simon.marchi@efficios.com>
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Andrew Burgess [Wed, 1 Feb 2023 17:09:47 +0000 (17:09 +0000)]
gdb/testsuite: fix fetch_src_and_symbols.exp with native-gdbserver board
I noticed that the gdb.debuginfod/fetch_src_and_symbols.exp script
doesn't work with the native-gdbserver board, I see this error:
ERROR: tcl error sourcing /tmp/build/gdb/testsuite/../../../src/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp.
ERROR: gdbserver does not support run without extended-remote
while executing
"error "gdbserver does not support $command without extended-remote""
(procedure "gdb_test_multiple" line 51)
invoked from within
This was introduced with this commit:
commit
7dd38e31d67c2548b52bea313ab18e40824c05da
Date: Fri Jan 6 18:45:27 2023 -0500
gdb/linespec.c: Fix missing source file during breakpoint re-set
The problem is that the above commit introduces a direct use of the
"run" command, which doesn't work with 'target remote' targets, as
exercised by the native-gdbserver board.
To avoid this, in this commit I switch to using runto_main. However,
calling runto_main will, by default, delete all the currently set
breakpoints. As the point of the above commit was to check that a
breakpoint set before stating an inferior would be correctly re-set,
we need to avoid this breakpoint deleting behaviour.
To do this I make use of with_override, and override the
delete_breakpoints proc with a dummy proc which does nothing.
By reverting the GDB changes in commit
7dd38e31d67c I have confirmed
that even after my changes in this commit, the test still fails. But
with the fixes in commit
7dd38e31d67c, this test now passed using the
unix, native-gdbserver, and native-extended-gdbserver boards.
Alexandra Hájková [Tue, 24 Jan 2023 17:13:38 +0000 (18:13 +0100)]
gdb: defer warnings when loading separate debug files
Currently, when GDB loads debug information from a separate debug
file, there are a couple of warnings that could be produced if things
go wrong.
In find_separate_debug_file_by_buildid (build-id.c) GDB can give a
warning if the separate debug file doesn't include any actual debug
information, and in separate_debug_file_exists (symfile.c) we can warn
if the CRC checksum in the separate debug file doesn't match the
checksum in the original executable.
The problem here is that, when looking up debug information, GDB will
try several different approaches, lookup by build-id, lookup by
debug-link, and then a lookup from debuginfod. GDB can potentially
give a warning from an earlier attempt, and then succeed with a later
attempt. In the cases I have run into this is primarily a warning
about some out of date debug information on my machine, but then GDB
finds the correct information using debuginfod. This can be confusing
to a user, they will see warnings from GDB when really everything is
working just fine.
For example:
warning: the debug information found in "/usr/lib/debug//lib64/ld-2.32.so.debug" \
does not match "/lib64/ld-linux-x86-64.so.2" (CRC mismatch).
This diagnostic was printed on Fedora 33 even when the correct
debuginfo was downloaded.
In this patch I propose that we defer any warnings related to looking
up debug information from a separate debug file. If any of the
approaches are successful then GDB will not print any of the warnings.
As far as the user is concerned, everything "just worked". Only if
GDB completely fails to find any suitable debug information will the
warnings be printed.
The crc_mismatch test compiles two executables: crc_mismatch and
crc_mismatch-2 and then strips them of debuginfo creating separate
debug files. The test then replaces crc_mismatch-2.debug with
crc_mismatch.debug to trigger "CRC mismatch" warning. A local
debuginfod server is setup to supply the correct debug file, now when
GDB looks up the debug info no warning is given.
The build-id-no-debug-warning.exp is similar to the previous test. It
triggers the "separate debug info file has no debug info" warning by
replacing the build-id based .debug file with the stripped binary and
then loading it to GDB. It then also sets up local debuginfod server
with the correct debug file to download to make sure no warnings are
emitted.
Nick Clifton [Wed, 1 Feb 2023 09:49:07 +0000 (09:49 +0000)]
Fix compilation of the assembler with sanitization enabled.
* dwarf2dbg.c (emit_inc_line_addr): Use unsigned constants when checking addr_delta.
Alan Modra [Wed, 1 Feb 2023 06:23:27 +0000 (16:53 +1030)]
Recursion in as_info_where
This function has a gas_assert, ie. possible call to as_abort, which
calls as_report_context, which calls as_info_where.
* messages.c (as_info_where): Don't gas_assert.
Simon Marchi [Tue, 31 Jan 2023 18:27:21 +0000 (13:27 -0500)]
gdb/dwarf: rename cooked_index_vector to cooked_index
See previous patch's commit message for rationale.
Change-Id: I6b8cdc045dffccc1c01ed690ff258af09f6ff076
Approved-By: Tom Tromey <tom@tromey.com>
Simon Marchi [Tue, 31 Jan 2023 18:27:20 +0000 (13:27 -0500)]
gdb/dwarf: rename cooked_index to cooked_index_shard
I propose to rename cooked_index_vector and cooked_index such that the
"main" object, that is the entry point to the index, is called
cooked_index. The fact that the cooked index is implemented as a vector
of smaller indexes is an implementation detail.
This patch renames cooked_index to cooked_index_shard. The following
patch renames cooked_index_vector to cooked_index.
Change-Id: Id650f97dcb23c48f8409fa0974cd093ca0b75177
Approved-By: Tom Tromey <tom@tromey.com>
Tom de Vries [Wed, 1 Feb 2023 00:13:37 +0000 (01:13 +0100)]
[gas] Emit v2 .debug_line for -gdwarf-2
Currently, when using -gdwarf-2, gas emits a v3 .debug_line contribution.
Fix this by emitting a v2 .debug_line contribution instead.
gas/ChangeLog:
2023-01-31 Tom de Vries <tdevries@suse.de>
PR 23941
* dwarf2dbg.c (DWARF2_LINE_VERSION): Set to 2 for -gdwarf-2.
(DWARF2_LINE_OPCODE_BASE): Handle DWARF2_LINE_VERSION == 2.
(dwarf2_directive_loc): Bump dwarf_level when encountering
v3 .loc options.
(out_debug_line): Don't output v3 standard opcodes for v2.
* testsuite/gas/i386/debug1.d: Update.
* testsuite/gas/i386/dwarf2-line-1.d: Update.
* testsuite/gas/i386/dwarf2-line-4.d: Update.
GDB Administrator [Wed, 1 Feb 2023 00:00:29 +0000 (00:00 +0000)]
Automatic date update in version.in
Simon Marchi [Tue, 31 Jan 2023 15:57:21 +0000 (10:57 -0500)]
gdb: add nullptr check to cooked_index_functions::dump
Since commit
7d82b08e9e0a ("gdb/dwarf: dump cooked index contents in
cooked_index_functions::dump"), we see:
maint print objfiles /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error^M
^M
Object file /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error: Objfile at 0x614000005040, bfd at 0x6120000e08c0, 15 minsyms^M
^M
Cooked index in use:^M
^M
/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/gdb-checked-static-cast.h:58: internal-error: checked_static_cast: Assertion `result != nullptr' failed.^M
A problem internal to GDB has been detected,^M
further debugging may prove unreliable.^M
----- Backtrace -----^M
FAIL: gdb.dwarf2/dw2-error.exp: maint print objfiles /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.dwarf2/dw2-error/dw2-error (GDB internal error)
The problem is that when cooked_index_functions fails to build an index,
per_objfile->index_table is nullptr. Therefore, add a nullptr check,
like other methods of cooked_index_functions already do.
Print the "Cooked index in use" message after the nullptr check, such
that if the cooked index failed to build, that message is not printed.
Change-Id: Id67aef592e76c41b1e3bde9838a4e36cef873253
Simon Marchi [Tue, 31 Jan 2023 15:57:20 +0000 (10:57 -0500)]
gdbsupport: allow passing nullptr to checked_static_cast
Both static_cast and dynamic_cast handle nullptr (they return nullptr),
so I think checked_static_cast should too. This will allow doing a null
check after a checked_static_cast:
cooked_index_vector *table
= (gdb::checked_static_cast<cooked_index_vector *>
(per_bfd->index_table.get ()));
if (table != nullptr)
return;
Change-Id: If5c3134e63696f8e417c87b5f3901240c9f7ea97
Simon Marchi [Tue, 31 Jan 2023 16:41:41 +0000 (11:41 -0500)]
gdb/testsuite: adjust ensure_gdb_index to cooked_index_functions::dump changes
Following
7d82b08e9e0a ("gdb/dwarf: dump cooked index contents in
cooked_index_functions::dump"), I see some failures like:
(gdb) mt print objfiles with-mf^M
^M
Object file /home/smarchi/build/binutils-gdb/gdb/testsuite/outputs/gdb.base/with-mf/with-mf: Objfile at 0x614000005040, bfd at 0x6120000e08c0, 18 minsyms ^M
^M
Cooked index in use:^M
^M
...
(gdb) FAIL: gdb.base/with-mf.exp: check if index present
This is because the format of the "Cooked index in use" line changed
slightly. Adjust ensure_gdb_index to expect the trailing colon.
Change-Id: If0a87575c02d8a0bc0d4b8ead540c234c62760f8
Simon Marchi [Tue, 31 Jan 2023 16:34:38 +0000 (11:34 -0500)]
gdb/testsuite: fix xfail in gdb.ada/ptype_tagged_param.exp
I see:
ERROR: wrong # args: should be "xfail message"
while executing
"xfail "no debug info" $gdb_test_name"
("uplevel" body line 3)
invoked from within
"uplevel {
if {!$has_runtime_debug_info} {
xfail "no debug info" $gdb_test_name
} else {
fail $gdb_test_name
}
}"
This is because the xfail takes only one argument, fix that.
Change-Id: I2e304d4fd3aa61067c04b5dac2be2ed34dab3190
Nick Clifton [Tue, 31 Jan 2023 13:02:20 +0000 (13:02 +0000)]
Updated Swedish translation for the binutils sub-directory
Alan Modra [Tue, 31 Jan 2023 11:18:58 +0000 (21:48 +1030)]
Re: Another fix for EFI generation with LTO enabled
Revert
1c66b8a03989 and instead fix the broken list pointer.
PR 29998
* pe-dll.c (build_filler_bfd): Revert last change.
* ldlang.c (lang_process): When rescanning archives for lto,
fix file_chain.tail pointer if the insert point happens to be
at the end of the list.
Andrew Burgess [Mon, 30 Jan 2023 11:47:31 +0000 (11:47 +0000)]
gas/ppc: Additional tests for DFP instructions
I noticed that some of the Power6 DFP instructions were not covered by
the assembler tests. I've added a new test file which I believe
covers all the DFP Power6 instructions.
The existing gas/testsuite/gas/ppc/power6.d test is called:
POWER6 tests (includes DFP and Altivec)
And does cover some of the DFP instructions. But, given the number of
additional instructions I'm adding I opted to add a whole new test
file. I've left the original power6.d unchanged, so there is now some
overlap, but I don't think that should hurt much.
Jan Beulich [Tue, 31 Jan 2023 08:47:22 +0000 (09:47 +0100)]
RISC-V: make C-extension JAL available again for (32-bit) assembly
Along with the normal JAL alias, the C-extension one should have been
moved as well by
839189bc932e ("RISC-V: re-arrange opcode table for
consistent alias handling"), for the assembler to actually be able to
use it where/when possible.
Since neither this nor any other compressed branch insn was being tested
so far, take the opportunity and introduce a new testcase covering those.
Alan Modra [Tue, 31 Jan 2023 04:46:02 +0000 (15:16 +1030)]
Silence ubsan warning about 1<<31
* merge.c (hash_blob): Write 1u << 31.
Alan Modra [Tue, 31 Jan 2023 02:09:29 +0000 (12:39 +1030)]
PR 30060, ASAN error in bfd_cache_close
After bfd_close nothing should access bfd memory. Now that bfd_close
always tidies up even after an error, attempting to tidy the cached
bfd list by calling bfd_cache_close is wrong and not needed.
PR 30060
* ar.c (remove_output): Don't call bfd_cache_close.
(output_bfd): Delete.
* arsup.c (ar_end): Call bfd_close_all_done, not bfd_cache_close.
Alan Modra [Mon, 30 Jan 2023 00:59:34 +0000 (11:29 +1030)]
testsuite XPASSes
This adjusts the testsuite to get rid of a number of XPASSes that have
appeared. Someone might like to look into a better patch for the s390
change.
aarch64-pe XPASS: weak symbols
arm-nacl XPASS: rgn-over8
mcore-pe XPASS: ld-scripts/provide-8
mips64-linux-gnuabi64 XPASS: vers4
mips64-linux-gnuabi64 XPASS: vers4b
mips-linux-gnu XPASS: vers4
mips-linux-gnu XPASS: vers4b
s390-linux-gnu XPASS: undefined line
sh4-linux-gnu XPASS: --gc-sections with __start_SECTIONNAME
sh-coff XPASS: objcopy object (simple copy)
sh-coff XPASS: objcopy executable (pr25662)
binutils/
* testsuite/binutils-all/objcopy.exp: Don't xfail "simple
copy" and "pr25662" on sh-*-coff. Remove all non-ELF xfails
on "ELF unknown section type" test.
ld/
* testsuite/ld-elfvers/vers.exp (vers4, vers4b): Don't xfail
all mips, just xfail mips irix.
* testsuite/ld-gc/pr19161.d: Don't xfail sh.
* testsuite/ld-scripts/rgn-over8-ok.d: Don't xfail nacl.
* testsuite/ld-scripts/weak.exp: Don't xfail aarch64-pe.
* testsuite/ld-undefined/undefined.exp: Conditionally xfail
"undefined line" depending on gcc version for s390.
GDB Administrator [Tue, 31 Jan 2023 00:00:13 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Mon, 30 Jan 2023 23:23:11 +0000 (16:23 -0700)]
Remove value_next declaration
value_next is declared but not defined. It's long obsolete. This
patch removes the stray declaration.
Simon Marchi [Mon, 30 Jan 2023 20:46:15 +0000 (15:46 -0500)]
gdb: fix dwarf2/cooked-index.c compilation on 32-bit systems
The i386 builder shows:
../../binutils-gdb/gdb/dwarf2/cooked-index.c: In member function ‘void cooked_index_vector::dump(gdbarch*) const’:
../../binutils-gdb/gdb/dwarf2/cooked-index.c:492:40: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘std::__underlying_type_impl<sect_offset, true>::type’ {aka ‘long long unsigned int’} [-Werror=format=]
492 | gdb_printf (" DIE offset: 0x%lx\n",
| ~~^
| |
| long unsigned int
| %llx
493 | to_underlying (entry->die_offset));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| std::__underlying_type_impl<sect_offset, true>::type {aka long long unsigned int}
The die_offset's underlying type is uint64, so use PRIx64 in the format
string.
Change-Id: Ibdde4c624ed1bb50eced9a514a4e37aec70a1323
Mark Wielaard [Sun, 15 Jan 2023 00:06:16 +0000 (01:06 +0100)]
gdb: Replace memcpy with std::copy to avoid some g++ warnings on sparc
For some reason g++ 12.2.1 on sparc produces spurious warnings for
stringop-overread and restrict in fbsd-tdep.c for a memcpy call.
Use std::copy to avoid the warnings:
In function ‘void* memcpy(void*, const void*, size_t)’,
inlined from ‘gdb::optional<std::vector<unsigned char, gdb::default_init_allocator<unsigned char, std::allocator<unsigned char> > > > fbsd_make_note_desc(target_object, uint32_t)’ at ../../binutils-gdb/gdb/fbsd-tdep.c:666:10:
/usr/include/bits/string_fortified.h:29:33: error: ‘void* __builtin_memcpy(void*, const void*, long unsigned int)’ specified bound
18446744073709551612 exceeds maximum object size
9223372036854775807 [-Werror=stringop-overflow=]
In function ‘void* memcpy(void*, const void*, size_t)’,
inlined from ‘gdb::optional<std::vector<unsigned char, gdb::default_init_allocator<unsigned char, std::allocator<unsigned char> > > > fbsd_make_note_desc(target_object, uint32_t)’ at ../../binutils-gdb/gdb/fbsd-tdep.c:673:10:
/usr/include/bits/string_fortified.h:29:33: error: ‘void* __builtin_memcpy(void*, const void*, long unsigned int)’ accessing
18446744073709551612 bytes at offsets 0 and 0 overlaps
9223372036854775801 bytes at offset -
9223372036854775805 [-Werror=restrict]
gdb/ChangeLog:
* fbsd-tdep.c (fbsd_make_note_desc): Use std::copy instead
of memcpy.
Simon Marchi [Mon, 30 Jan 2023 16:03:37 +0000 (11:03 -0500)]
gdb/dwarf: dump cooked index contents in cooked_index_functions::dump
As I am investigating a crash I see with the cooked index, I thought it
would be useful to have a way to dump the index contents. For those not
too familiar with it (that includes me), it can help get a feel of what
it contains and how it is structured.
The cooked_index_functions::dump function is called as part of the
"maintenance print objfiles" command. I tried to make the output
well structured and indented to help readability, as this prints a lot
of text.
The dump function first dumps all cooked index entries, like this:
[25] ((cooked_index_entry *) 0x621000121220)
name: __ioinit
canonical: __ioinit
DWARF tag: DW_TAG_variable
flags: 0x2 [IS_STATIC]
DIE offset: 0x21a4
parent: ((cooked_index_entry *) 0x6210000f9610) [std]
Then the information about the main symbol:
main: ((cooked_index_entry *) 0x621000123b40) [main]
And finally the address map contents:
[1] ((addrmap *) 0x6210000f7910)
[0x0] ((dwarf2_per_cu_data *) 0)
[0x118a] ((dwarf2_per_cu_data *) 0x60c000007f00)
[0x1cc7] ((dwarf2_per_cu_data *) 0)
[0x1cc8] ((dwarf2_per_cu_data *) 0x60c000007f00)
[0x1cdf] ((dwarf2_per_cu_data *) 0)
[0x1ce0] ((dwarf2_per_cu_data *) 0x60c000007f00)
The display of address maps above could probably be improved, to show it
more as ranges, but I think this is a reasonable start.
Note that this patch depends on Pedro Alves' patch "enum_flags
to_string" [1]. If my patch is to be merged before Pedro's series, I
will cherry-pick this patch from his series and merge it before mine.
[1] https://inbox.sourceware.org/gdb-patches/
20221212203101.
1034916-8-pedro@palves.net/
Change-Id: Ida13e479fd4c8d21102ddd732241778bc3b6904a
Pedro Alves [Tue, 25 Oct 2022 14:39:37 +0000 (15:39 +0100)]
enum_flags to_string
This commit introduces shared infrastructure that can be used to
implement enum_flags -> to_string functions. With this, if we want to
support converting a given enum_flags specialization to string, we
just need to implement a function that provides the enumerator->string
mapping, like so:
enum some_flag
{
SOME_FLAG1 = 1 << 0,
SOME_FLAG2 = 1 << 1,
SOME_FLAG3 = 1 << 2,
};
DEF_ENUM_FLAGS_TYPE (some_flag, some_flags);
static std::string
to_string (some_flags flags)
{
static constexpr some_flags::string_mapping mapping[] = {
MAP_ENUM_FLAG (SOME_FLAG1),
MAP_ENUM_FLAG (SOME_FLAG2),
MAP_ENUM_FLAG (SOME_FLAG3),
};
return flags.to_string (mapping);
}
.. and then to_string(SOME_FLAG2 | SOME_FLAG3) produces a string like
"0x6 [SOME_FLAG2 SOME_FLAG3]".
If we happen to forget to update the mapping array when we introduce a
new enumerator, then the string representation will pretty-print the
flags it knows about, and then the leftover flags in hex (one single
number). For example, if we had missed mapping SOME_FLAG2 above, we'd
end up with:
to_string(SOME_FLAG2 | SOME_FLAG3) => "0x6 [SOME_FLAG2 0x4]");
Other than in the unit tests included, no actual usage of the
functionality is added in this commit.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I835de43c33d13bc0c95132f42c3f97318b875779
Tom Tromey [Fri, 27 Jan 2023 18:19:16 +0000 (11:19 -0700)]
Fix comparator bug in cooked index
Simon pointed out that the cooked index template-matching patch
introduced a failure in libstdc++ debug mode. In particular, the new
code violates the assumption of std::lower_bound and std::upper_bound
that the range is sorted with respect to the comparison.
When I first debugged this, I thought the problem was unfixable as-is
and that a second layer of filtering would have to be done. However,
on irc, Simon pointed out that it could perhaps be solved if the
comparison function were assured that one operand always came from the
index, with the other always being the search string.
This patch implements this idea.
First, a new mode is introduced: a sorting mode for
cooked_index_entry::compare. In this mode, strings are compared
case-insensitively, but we're careful to always sort '<' before any
other printable character. This way, two names like "func" and
"func<param>" will be sorted next to each other -- i.e., "func1" will
not be seen between them. This is important when searching.
Second, the compare function is changed to work in a strcmp-like way.
This makes it easier to test and (IMO) understand.
Third, the compare function is modified so that in non-sorting modes,
the index entry is always the first argument. This allows consistency
in compares.
I regression tested this in libstdc++ debug mode on x86-64 Fedora 36.
It fixes the crash that Simon saw.
This is v2. I believe it addresses the review comments, except for
the 'enum class' change, as I mentioned in email on the list.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Tom Tromey [Sat, 28 Jan 2023 15:30:57 +0000 (08:30 -0700)]
Clean up lnp_state_machine constructor
This changes the lnp_state_machine constructor to initialize members
directly; and changes lnp_state_machine itself to initialize members
inline when possible.
Reviewed-By: Lancelot Six <lancelot.six@amd.com>
Tom Tromey [Mon, 30 Jan 2023 15:29:36 +0000 (10:29 -0500)]
Make addrmap const-correct in cooked index
After the cooked index is created, the addrmaps should be const.
Change-Id: I8234520ab346ced40a8dd6e478ba21fc438c2ba2
Simon Marchi [Fri, 27 Jan 2023 19:46:50 +0000 (14:46 -0500)]
gdb: provide const-correct versions of addrmap::find and addrmap::foreach
Users of addrmap::find and addrmap::foreach that have a const addrmap
should ideally receive const pointers to objects, to indicate they
should not be modified. However, users that have a non-const addrmap
should still receive a non-const pointer.
To achieve this, without adding more virtual methods, make the existing
find and foreach virtual methods private and prefix them with "do_".
Add small non-const and const wrappers for find and foreach.
Obviously, the const can be cast away, but if using static_cast
instead of C-style casts, then the compiler won't let you cast
the const away. I changed all the callers of addrmap::find and
addrmap::foreach I could find to make them use static_cast.
Change-Id: Ia8e69d022564f80d961413658fe6068edc71a094
Tom Tromey [Mon, 30 Jan 2023 15:03:33 +0000 (08:03 -0700)]
Use xfail in ptype_tagged_param.exp
Pedro pointed out that ptype_tagged_param.exp used a kfail, but an
xfail would be more appropriate as the problem appears to be in gcc,
not gdb.
Christina Schimpe [Thu, 9 Dec 2021 13:18:36 +0000 (14:18 +0100)]
gdb: Remove workaround for the vCont packet
The workaround for the vCont packet is no longer required due to the
former commit "gdb: Make global feature array a per-remote target array".
The vCont packet is now checked once when the connection is started and
the supported vCont actions are set to the target's remote state
attribute.