Andrew Burgess [Fri, 17 Feb 2023 14:33:03 +0000 (14:33 +0000)]
gdb/testsuite: make more use of mi-support.exp
Building on the previous commit, now that the breakpoint related
support functions in lib/mi-support.exp can now help creating the
patterns for thread specific breakpoints, make use of this
functionality for gdb.mi/mi-nsmoribund.exp and gdb.mi/mi-pending.exp.
There should be no changes in what is tested after this commit.
Reviewed-By: Pedro Alves <pedro@palves.net>
Andrew Burgess [Fri, 17 Feb 2023 10:48:06 +0000 (10:48 +0000)]
gdb: don't duplicate 'thread' field in MI breakpoint output
When creating a thread-specific breakpoint with a single location, the
'thread' field would be repeated in the MI output. This can be seen
in two existing tests gdb.mi/mi-nsmoribund.exp and
gdb.mi/mi-pending.exp, e.g.:
(gdb)
-break-insert -p 1 bar
^done,bkpt={number="1",type="breakpoint",disp="keep",
enabled="y",
addr="0x000000000040110a",func="bar",
file="/tmp/mi-thread-specific-bp.c",
fullname="/tmp/mi-thread-specific-bp.c",
line="32",thread-groups=["i1"],
thread="1",thread="1", <================ DUPLICATION!
times="0",original-location="bar"}
I know we need to be careful when adjusting MI output, but I'm hopeful
in this case, as the field is duplicated, and the field contents are
always identical, that we might get away with removing one of the
duplicates.
The change in GDB is a fairly trivial condition change.
We did have a couple of tests that contained the duplicate fields in
their expected output, but given there was no comment pointing out
this oddity either in the GDB code, or in the test, I suspect this was
more a case of copying whatever output GDB produced and using that as
the expected results. I've updated these tests to remove the
duplication.
I've update lib/mi-support.exp to provide support for building
breakpoint patterns that contain the thread field, and I've made use
of this in a new test I've added that is just about creating
thread-specific breakpoints and checking the results. The two tests I
mentioned above as being updated could also use the new
lib/mi-support.exp functionality, but I'm going to do that in a later
patch, this way it is clear what changes I'm actually proposing to
make to the expected output.
As I said, I hope that frontends will be able to handle this change,
but I still think its worth adding a NEWS entry, that way, if someone
runs into problems, there's a chance they can figure out what's going
on.
This should not impact CLI output at all.
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Pedro Alves <pedro@palves.net>
Andrew Burgess [Thu, 16 Feb 2023 19:07:12 +0000 (19:07 +0000)]
gdb: remove an out of date comment about disp_del_at_next_stop
Delete an out of date comment about disp_del_at_next_stop, the comment
says:
/* NOTE drow/2003-09-08: This state only exists for removing
watchpoints. It's not clear that it's necessary... */
I'm sure this was true when the comment was added, but today the
disp_del_at_next_stop state is not just used for deleting watchpoints,
which leaves us with "It's not clear that it's necessary...", which
doesn't really help at all.
And then this comment is located on one random place where
disp_del_at_next_stop is used, rather than at its definition site.
Lets just delete the comment.
No user visible changes after this commit.
Reviewed-By: Pedro Alves <pedro@palves.net>
Richard Ball [Tue, 28 Feb 2023 10:55:25 +0000 (10:55 +0000)]
[Aarch64] Add Binutils support for MEC
This change supports MEC which is part of RME (Realm Management Extension).
Alan Modra [Tue, 28 Feb 2023 00:34:33 +0000 (11:04 +1030)]
chew.c printf of intptr_t
Seen when building binutils with gcc -m32 on x86_64-linux.
chew.c: In function ‘print’:
chew.c:1434:59: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘intptr_t’ {aka ‘int’} [-Wformat=]
1434 | fprintf (stderr, "print: illegal print destination `%ld'\n", *isp);
| ~~^ ~~~~
| | |
| | intptr_t {aka int}
| long int
| %d
* chew.c: Include inttypes.h.
(print): Use PRIdPTR for *isp.
Mark Harmstone [Mon, 20 Feb 2023 14:10:05 +0000 (14:10 +0000)]
ld: Sort section contributions in PDB files
Microsoft's DIA library, and thus also MSVC and WinDbg, expects section
contributions to be ordered by section number and offset, otherwise it's
unable to resolve line numbers.
Alan Modra [Mon, 27 Feb 2023 11:31:08 +0000 (22:01 +1030)]
Free ecoff debug info
This frees memory associated with the mips ecoff find_nearest_line.
* elfxx-mips.x (free_ecoff_debug): New function, extracted from..
(_bfd_mips_elf_read_ecoff_info): ..here. Free ext_hdr earlier.
Don't clear already NULL fdr.
(struct mips_elf_find_line): Move earlier.
(_bfd_mips_elf_close_and_cleanup): Call free_ecoff_debug.
(_bfd_mips_elf_find_nearest_line): Likewise on error paths,
and to clean up input_debug when done.
Alan Modra [Mon, 27 Feb 2023 04:23:22 +0000 (14:53 +1030)]
Add some sanity checking in ECOFF lookup_line
More anti-fuzzer bounds checking for the ECOFF support. A lot of this
is in ancient code using "long" for counts and sizes, which is why the
patch uses "(long) ((unsigned long) x + 1) > 0" in a few places. The
unsigned long cast is so that "x + 1" doesn't trigger ubsan warnings
about signed integer overflow. It would be a good idea to replace
most of the longs used in binutils with size_t, but that's more than I
care to do for COFF/ECOFF.
* ecofflink.c (mk_fdrtab): Sanity check string offsets.
(lookup_line): Likewise, and symbol indices.
Alan Modra [Mon, 27 Feb 2023 04:19:10 +0000 (14:49 +1030)]
Another PE SEC_HAS_CONTENTS test
I'd skipped this one before, thinking "obfd, that's the linker output
bfd so no need to test". Wrong, this is objcopy output.
* peXXigen.c (_bfd_XX_bfd_copy_private_bfd_data_common): Test
SEC_HAS_CONTENTS before reading section.
GDB Administrator [Tue, 28 Feb 2023 00:00:13 +0000 (00:00 +0000)]
Automatic date update in version.in
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Forced quit cases handled by resetting sync_quit_force_run
During my audit of the use of gdb_exception with regard to QUIT
processing, I found a try/catch in the scoped_switch_fork_info
destructor.
Static analysis found this call path from the destructor to
maybe_quit():
scoped_switch_fork_info::~scoped_switch_fork_info()
-> remove_breakpoints()
-> remove_breakpoint(bp_location*)
-> remove_breakpoint_1(bp_location*, remove_bp_reason)
-> memory_validate_breakpoint(gdbarch*, bp_target_info*)
-> target_read_memory(unsigned long, unsigned char*, long)
-> target_read(target_ops*, target_object, char const*, unsigned char*, unsigned long, long)
-> maybe_quit()
Since it's not safe to do a 'throw' from a destructor, we simply
call set_quit_flag and, for gdb_exception_forced_quit, also
set sync_quit_force_run. This will cause the appropriate
exception to be rethrown at the next QUIT check.
Another case is the try / catch in tui_getc() in tui-io.c. The
existing catch swallows the exception. I've added a catch for
'gdb_exception_forced_quit', which also swallows the exception,
but also sets sync_quit_force_run and calls set_quit_flag in
order to restart forced quit processing at the next QUIT check.
This is required because it isn't safe to throw into/through
readline.
Thanks to Pedro Alves for suggesting this idea.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-By: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Introduce set_force_quit_flag and change type of sync_quit_force_run
At the moment, handle_sigterm() in event-top.c does the following:
sync_quit_force_run = 1;
set_quit_flag ();
This was used several more times in a later patch in this series, so
I'm introducing (at Pedro's suggestion) a new function named
'set_force_quit_flag'. It simply sets sync_quit_force_run and also
calls set_quit_flag(). I've revised the later patch to call
set_force_quit_flag instead.
I noticed that sync_quit_force_run is declared as an int but is being
used as a bool, so I also changed its type to bool in this commit.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Approved-By: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
QUIT processing w/ explicit throw for gdb_exception_forced_quit
This commit contains changes which have an explicit throw for
gdb_exception_forced_quit, or, in a couple of cases for gdb_exception,
but with a throw following a check to see if 'reason' is
RETURN_FORCED_QUIT.
Most of these are straightforward - it made sense to continue to allow
an existing catch of gdb_exception to also catch gdb_exception_quit;
in these cases, a catch/throw for gdb_exception_forced_quit was added.
There are two cases, however, which deserve a more detailed
explanation.
1) remote_fileio_request in gdb/remote-fileio.c:
The try block calls do_remote_fileio_request which can (in turn)
call one of the functions in remote_fio_func_map[]. Taking the
first one, remote_fileio_func_open(), we have the following call
path to maybe_quit():
remote_fileio_func_open(remote_target*, char*)
-> target_read_memory(unsigned long, unsigned char*, long)
-> target_read(target_ops*, target_object, char const*, unsigned char*, unsigned long, long)
-> maybe_quit()
Since there is a path to maybe_quit(), we must ensure that the
catch block is not permitted to swallow a QUIT representing a
SIGTERM.
However, for this case, we must take care not to change the way that
Ctrl-C / SIGINT is handled; we want to send a suitable EINTR reply to
the remote target should that happen. That being the case, I added a
catch/throw for gdb_exception_forced_quit. I also did a bit of
rewriting here, adding a catch for gdb_exception_quit in favor of
checking the 'reason' code in the catch block for gdb_exception.
2) mi_execute_command in gdb/mi/mi-main.c:
The try block calls captured_mi_execute_command(); there exists
a call path to maybe_quit():
captured_mi_execute_command(ui_out*, mi_parse*)
-> mi_cmd_execute(mi_parse*)
-> get_current_frame()
-> get_prev_frame_always_1(frame_info*)
-> frame_register_unwind_location(frame_info*, int, int*, lval_type*, unsigned long*, int*)
-> frame_register_unwind(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*)
-> value_entirely_available(value*)
-> value_fetch_lazy(value*)
-> value_fetch_lazy_memory(value*)
-> read_value_memory(value*, long, int, unsigned long, unsigned char*, unsigned long)
-> maybe_quit()
That being the case, we can't allow the exception handler (catch block)
to swallow a gdb_exception_quit for SIGTERM. However, it does seem
reasonable to output the exception via the mi interface so that some
suitable message regarding SIGTERM might be printed; therefore, I
check the exception's 'reason' field for RETURN_FORCED_QUIT and
do a throw for this case.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-By: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Guile QUIT processing updates
This commit contains QUIT processing updates for GDB's Guile support.
As with the Python updates, we don't want to permit this code to
swallow the exception, gdb_exception_forced_quit, which is associated
with GDB receiving a SIGTERM.
I've adopted the same solution that I used for Python; whereever
a gdb_exception is caught in try/catch code in the Guile extension
language support, a catch for gdb_exception_forced_quit has been
added; this catch block will simply call quit_force(), which will
cause the necessary cleanups to occur followed by GDB exiting.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-By: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Python QUIT processing updates
See the previous patches in this series for the motivation behind
these changes.
This commit contains updates to Python's QUIT handling. Ideally, we'd
like to throw gdb_exception_forced_quit through the extension
language; I made an attempt to do this for gdb_exception_quit in an
earlier version of this patch, but Pedro pointed out that it is
(almost certainly) not safe to do so.
Still, we definitely don't want to swallow the exception representing
a SIGTERM for GDB, nor do we want to force modules written in the
extension language to have to explicitly handle this case. Since the
idea is for GDB to cleanup and quit for this exception, we'll simply
call quit_force() just as if the gdb_exception_forced_quit propagation
had managed to make it back to the top level.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-By: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Catch gdb_exception_error instead of gdb_exception (in many places)
As described in the previous commit for this series, I became
concerned that there might be instances in which a QUIT (due to either
a SIGINT or SIGTERM) might not cause execution to return to the top
level. In some (though very few) instances, it is okay to not
propagate the exception for a Ctrl-C / SIGINT, but I don't think that
it is ever okay to swallow the exception caused by a SIGTERM.
Allowing that to happen would definitely be a deviation from the
current behavior in which GDB exits upon receipt of a SIGTERM.
I looked at all cases where an exception handler catches a
gdb_exception. Handlers which did NOT need modification were those
which satisifed one or more of the following conditions:
1) There is no call path to maybe_quit() in the try block. I used a
static analysis tool to help make this determination. In
instances where the tool didn't provide an answer of "yes, this
call path can result in maybe_quit() being called", I reviewed it
by hand.
2) The catch block contains a throw for conditions that it
doesn't want to handle; these "not handled" conditions
must include the quit exception and the new "forced quit" exception.
3) There was (also) a catch for gdb_exception_quit.
Any try/catch blocks not meeting the above conditions could
potentially swallow a QUIT exception.
My first thought was to add catch blocks for gdb_exception_quit and
then rethrow the exception. But Pedro pointed out that this can be
handled without adding additional code by simply catching
gdb_exception_error instead. That's what this patch series does.
There are some oddball cases which needed to be handled differently,
plus the extension languages, but those are handled in later patches.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-by: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Handle gdb SIGTERM by throwing / catching gdb_exception_force_quit
When a GDB process receives the SIGTERM signal, handle_sigterm() in
event-top.c is called. The global variable 'sync_quit_force_run' is
set by this signal handler. It does some other things too, but the
setting of this global is the important bit for the SIGTERM part of
this discussion.
GDB will periodically check to see whether a Ctrl-C or SIGTERM has
been received. This is performed via use of the QUIT macro in
GDB's code. QUIT is defined to invoke maybe_quit(), which will be
periodically called during any lengthy operation. This is supposed to
ensure that the user won't have to wait too long for a Ctrl-C or
SIGTERM to be acted upon.
When a Ctrl-C / SIGINT is received, quit_handler() will decide whether
to pass the SIGINT onto the inferior or to call quit() which causes
gdb_exception_quit to be thrown. This exception (usually) propagates
to the top level. Control is then returned to the top level event
loop.
At the moment, SIGTERM is handled very differently. Instead of
throwing an exception, quit_force() is called. This does eventually
cause GDB to exit(), but prior to that happening, the inferiors
are killed or detached and other target related cleanup occurs.
As shown in this discussion between Pedro Alves and myself...
https://sourceware.org/pipermail/gdb-patches/2021-July/180802.html
https://sourceware.org/pipermail/gdb-patches/2021-July/180902.html
https://sourceware.org/pipermail/gdb-patches/2021-July/180903.html
...we found that it is possible for inferior_ptid and current_thread_
to get out of sync. When that happens, the "current_thread_ != nullptr"
assertion in inferior_thread() can fail resulting in a GDB internal
error.
Pedro recommended that we "let the normal quit exception propagate all
the way to the top level, and then have the top level call quit_force
if sync_quit_force_run is set." However, after the v2 series for this
patch set, we tweaked that idea by introducing a new exception for
handling SIGTERM.
This commit implements the obvious part of Pedro's suggestion:
Instead of calling quit_force from quit(), throw_forced_quit() is now
called instead. This causes the new exception 'gdb_exception_forced_quit'
to be thrown.
At the top level, I changed catch_command_errors() and captured_main()
to catch gdb_exception_forced_quit and then call quit_force() from the
catch block. I also changed start_event_loop() to also catch
gdb_exception_forced_quit; while we could also call quit_force() from
that catch block, it's sufficient to simply rethrow the exception
since it'll be caught by the newly added code in captured_main().
Making these changes fixed the failure / regression that I was seeing
for gdb.base/gdb-sigterm.exp when run on a machine with glibc-2.34.
However, there are many other paths back to the top level which this
test case does not test. I did an audit of all of the try / catch
code in GDB in which calls in the try-block might (eventually) call
QUIT. I found many cases where gdb_exception_quit and the new
gdb_exception_forced_quit will be swallowed. (When using GDB, have
you ever hit Ctrl-C and not have it do anything; if so, it could be
due to a swallowed gdb_exception_quit in one of the cases I've
identified.) The rest of the patches in this series deal with this
concern.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-by: Pedro Alves <pedro@palves.net>
Kevin Buettner [Mon, 27 Feb 2023 23:11:37 +0000 (16:11 -0700)]
Introduce gdb_exception_forced_quit
This commit adds a new exception 'gdb_exception_forced_quit', reason
code 'REASON_FORCED_QUIT', return mask 'RETURN_MASK_FORCED_QUIT', and
a wrapper for throwing the exception, throw_forced_quit().
The addition of this exception plus supporting code will allow us to
recognize that a SIGTERM has been received by GDB and then propagate
recognition of that fact to the upper levels of GDB where it can be
correctly handled. At the moment, when GDB receives a SIGTERM, it
will attempt to exit via a series of calls from the QUIT checking
code. However, before it can exit, it must do various cleanups, such
as killing or detaching all inferiors. Should these cleanups be
attempted while GDB is executing very low level code, such as reading
target memory from within ps_xfer_memory(), it can happen that some of
GDB's state is out of sync with regard to the cleanup code's
expectations. In the case just mentioned, it's been observed that
inferior_ptid and the current_thread_ are not in sync; this triggers
an assert / internal error.
This commit only introduces the exception plus supporting machinery;
changes which use this new exception are in later commits in this
series.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=26761
Tested-by: Tom de Vries <tdevries@suse.de>
Approved-by: Pedro Alves <pedro@palves.net>
Tom Tromey [Wed, 8 Feb 2023 20:59:36 +0000 (13:59 -0700)]
Fix value chain use-after-free
Hannes filed a bug showing a crash, where a pretty-printer written in
Python could cause a use-after-free. He sent a patch, but I thought a
different approach was needed.
In a much earlier patch (see bug #12533), we changed the Python code
to release new values from the value chain when constructing a
gdb.Value. The rationale for this is that if you write a command that
does a lot of computations in a loop, all the values will be kept live
by the value chain, resulting in gdb using a large amount of memory.
However, suppose a value is passed to Python from some code in gdb
that needs to use the value after the call into Python. In this
scenario, value_to_value_object will still release the value -- and
because gdb code doesn't generally keep strong references to values (a
consequence of the ancient decision to use the value chain to avoid
memory management), this will result in a use-after-free.
This scenario can happen, as it turns out, when a value is passed to
Python for pretty-printing. Now, normally this route boxes the value
via value_to_value_object_no_release, avoiding the problematic release
from the value chain. However, if you then call Value.cast, the
underlying value API might return the same value, when is then
released from the chain.
This patch fixes the problem by changing how value boxing is done.
value_to_value_object no longer removes a value from the chain.
Instead, every spot in gdb that might construct new values uses a
scoped_value_mark to ensure that the requirements of bug #12533 are
met. And, because incoming values aren't ever released from the chain
(the Value.cast one comes earlier on the chain than the
scoped_value_mark), the bug can no longer occur. (Note that many
spots in the Python layer already take this approach, so not many
places needed to be touched.)
In the future I think we should replace the use of raw "value *" with
value_ref_ptr pretty much everywhere. This will ensure lifetime
safety throughout gdb.
The test case in this patch comes from Hannes' original patch. I only
made a trivial ("require") change to it. However, while this fails
for him, I can't make it fail on this machine; nevertheless, he tried
my patch and reported the bug as being fixed.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30044
Pedro Alves [Wed, 16 Nov 2022 17:01:44 +0000 (17:01 +0000)]
Remove infrun_thread_thread_exit observer
After the previous patches, I believe this observer isn't necessary
anymore for anything. Remove it.
Change-Id: Idb33fb6b6f55589c8c523a92169b3ca95a23d0b9
Pedro Alves [Fri, 25 Nov 2022 16:20:22 +0000 (16:20 +0000)]
all-stop "follow-fork parent" and selecting another thread
With:
- catch a fork in thread 1
- select thread 2
- set follow-fork child
- next
... follow_fork notices that thread 1 had last stopped for a fork
which hasn't been followed yet, and because thread 1 is not the
current thread, GDB aborts the execution command, presenting the stop
in thread 1.
That makes sense, as only the forking thread (thread 1) survives in
the child, so better stop and let the user decide how to proceed.
However, with:
- catch a fork in thread 1
- select thread 2
- set follow-fork parent << note difference here
- next
... GDB does the same: follow_fork notices that thread 1 had last
stopped for a fork which hasn't been followed yet, and because thread
1 is not the current thread, GDB aborts the execution command,
presenting the stop in thread 1.
Aborting/stopping in this case doesn't make sense to me. As we're
following the parent, thread 2 will still continue to exist in the
parent. What the child does after we've followed the parent shouldn't
matter -- it can go on running free, be detached, etc., depending on
"set schedule-multiple", "set detach-on-fork", etc. That does not
influence the execution command that the user issued for the parent
thread.
So this patch changes GDB in that direction -- in follow_fork, if
following the parent, and we've switched threads meanwhile, switch
back to the unfollowed thread, follow it (stay with the parent), and
don't abort/stop. If we're following a fork (as opposed to vfork),
then switch back again to the thread that the user was trying to
resume. If following a vfork, however, stay with the vforking-thread
selected, as we will need to see a vfork_done event first, before we
can resume any other thread.
As I was working on this, I managed to end up calling target_resume
for a solo-thread resume (to collect the vfork_done event), with
scope_ptid pointing at the vfork parent thread, and inferior_ptid
pointing to the vfork child. For a solo-thread resume, the scope_ptid
argument to target_resume must the same as inferior_ptid. The mistake
was caught by the assertion in target_resume, like so:
...
[infrun] resume_1: step=0, signal=GDB_SIGNAL_0, trap_expected=0, current thread [
1722839.
1722839.0] at 0x5555555553c3
[infrun] do_target_resume: resume_ptid=
1722839.
1722939.0, step=0, sig=GDB_SIGNAL_0
../../src/gdb/target.c:2661: internal-error: target_resume: Assertion `inferior_ptid.matches (scope_ptid)' failed.
...
but I think it doesn't hurt to catch such a mistake earlier, hence the
change in internal_resume_ptid.
Change-Id: I896705506a16d2488b1bfb4736315dd966f4e412
Pedro Alves [Thu, 17 Nov 2022 18:25:36 +0000 (18:25 +0000)]
Make follow_fork not rely on get_last_target_status
Currently, if
- you're in all-stop mode,
- the inferior last stopped because of a fork catchpoint,
when you next resume the program, gdb checks whether it had last
stopped for a fork/vfork, and if so,
a) if the current thread is the one that forked, gdb follows the
parent/child, depending on "set follow-fork" mode.
b) if the current thread is some other thread (because you switched
threads meanwhile), gdb switches back to that thread, gdb follows
the parent/child, and stops the resumption command.
There's a problem in b), however -- if you have "set schedule-multiple
off", which is the default, or "set scheduler-locking on", gdb will
still switch back to the forking thread, even if you didn't want to
resume it. For example, with:
(gdb) catch fork
(gdb) c
* thread 1 stops for fork
(gdb) thread 2
(gdb) set scheduler-locking on
(gdb) c
gdb switches back to thread 1, and follows the fork.
Or with:
(gdb) add-inferior -exec prog
(gdb) inferior 2
(gdb) start
(gdb) inferior 1
(gdb) catch fork
(gdb) c
* thread 1.1 stops for fork
(gdb) inferior 2
(gdb) set schedule-multiple off # this is the default
(gdb) c
gdb switches back to thread 1.1, and follows the fork.
Another issue is that, because follow_fork relies on
get_last_target_status to find the thread that has a pending fork, it
is possible to confuse it. For example, "run" or "start" call
init_wait_for_inferior, which clears the last target status, so this:
(gdb) catch fork
(gdb) c
* thread 1 stops for fork
(gdb) add-inferior -exec prog
(gdb) inferior 2
(gdb) start
(gdb) set follow-fork child
(gdb) inferior 1
(gdb) n
... does not follow to the fork child of inferior 1, because the
get_last_target_status call in follow_fork doesn't return a
TARGET_WAITKIND_FORKED. Thanks to Simon for this example.
All of the above are fixed by this patch. It changes follow_fork to
not look at get_last_target_status, but to instead iterate over the
set of threads that the user is resuming, and find the one that has a
pending_follow kind of fork/vfork.
gdb.base/foll-fork.exp is augmented to exercise the last "start"
scenario described above. The other cases will be exercised in the
testcase added by the following patch.
Change-Id: Ifcca77e7b2456277387f40660ef06cec2b93b97e
Pedro Alves [Thu, 17 Nov 2022 23:21:04 +0000 (23:21 +0000)]
Improve "info program"
With gdb.base/catch-follow-exec.exp, we currently see:
~~~~~~~~~~~~~~~
(gdb)
continue
Continuing.
process 693251 is executing new program: /usr/bin/ls
[New inferior 2]
[New process 693251]
[Switching to process 693251]
Thread 2.1 "ls" hit Catchpoint 2 (exec'd /usr/bin/ls), 0x00007ffff7fd0100 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb)
info prog
No selected thread.
~~~~~~~~~~~~~~~
Note the "No selected thread" output. That is totally bogus, because
there _is_ a selected thread. What GDB really means, is that it can't
find the thread that had the latest (user-visible) stop. And that
happens because "info program" gets that info from
get_last_target_status, and the last target status has been cleared.
However, GDB also checks if there is a selected thread, here:
if (ptid == null_ptid || ptid == minus_one_ptid)
error (_("No selected thread."));
.. the null_ptid part. That is also bogus, because what matters is
the thread that last reported a stop, not the current thread:
- in all-stop mode, "info program" displays info about the last stop.
That may have happened on a thread different from the selected
thread.
- in non-stop mode, because all threads are controlled individually,
"info program" shows info about the last stop of the selected
thread.
The current code already behaves this way, though in a poor way. This
patch reimplements it, such that the all-stop version now finds the
thread that last reported an event via the 'previous_thread' strong
reference. Being a strong reference means that if that thread has
exited since the event was reported, 'previous_thread' will still
point to it, so we can say that the thread exited meanwhile.
The patch also extends "info program" output a little, to let the user
know which thread we are printing info for. For example, for the
gdb.base/catch-follow-exec.exp case we shown above, we now get:
(gdb) info prog
Last stopped for thread 2.1 (process 710867).
Using the running image of child process 710867.
Program stopped at 0x7ffff7fd0100.
It stopped at breakpoint 2.
Type "info stack" or "info registers" for more information.
(gdb)
while in non-stop mode, we get:
(gdb) info prog
Selected thread 2.1 (process 710867).
Using the running image of child process 710867.
Program stopped at 0x7ffff7fd0100.
It stopped at breakpoint 2.
Type "info stack" or "info registers" for more information.
(gdb)
In both cases, the first line of output is new.
The existing code considered these running/exited cases as an error,
but I think that that's incorrect, since this is IMO just plain
execution info as well. So the patch makes those cases regular
prints, not errors.
If the thread is running, we get, in non-stop mode:
(gdb) info prog
Selected thread 2.1 (process 710867).
Selected thread is running.
... and in all-stop:
(gdb) info prog
Last stopped for thread 2.1 (process 710867).
Thread is now running.
If the thread has exited, we get, in non-stop mode:
(gdb) info prog
Selected thread 2.1 (process 710867).
Selected thread has exited.
... and in all-stop:
(gdb) info prog
Last stopped for thread 2.1 (process 710867).
Thread has since exited.
The gdb.base/info-program.exp testcase was much extended to test
all-stop/non-stop and single-threaded/multi-threaded.
Change-Id: I51d9d445f772d872af3eead3449ad4aa445781b1
Pedro Alves [Thu, 17 Nov 2022 23:08:58 +0000 (23:08 +0000)]
Convert previous_inferior_ptid to strong reference to thread_info
I originally wrote this patch, because while working on some other
patch, I spotted a regression in the
gdb.multi/multi-target-no-resumed.exp.exp testcase. Debugging the
issue, I realized that the problem was related to how I was using
previous_inferior_ptid to look up the thread the user had last
selected. The problem is that previous_inferior_ptid alone doesn't
tell you which target that ptid is from, and I was just always using
the current target, which was incorrect. Two different targets may
have threads with the same ptid.
I decided to fix this by replacing previous_inferior_ptid with a
strong reference to the thread, called previous_thread.
I have since found a new motivation for this change -- I would like to
tweak "info program" to not rely on get_last_target_status returning a
ptid that still exists in the thread list. With both the follow_fork
changes later in this series, and the step-over-thread-exit changes,
that can happen, as we'll delete threads and not clear the last
waitstatus.
A new update_previous_thread function is added that can be used to
update previous_thread from inferior_ptid. This must be called in
several places that really want to get rid of previous_thread thread,
and reset the thread id counter, otherwise we get regressions like
these:
(gdb) info threads -gid
Id GId Target Id Frame
- * 1 1 Thread
2974541.
2974541 "tids-gid-reset" main () at src/gdb/testsuite/gdb.multi/tids-gid-reset.c:21
- (gdb) PASS: gdb.multi/tids-gid-reset.exp: single-inferior: after restart: info threads -gid
+ * 1 2 Thread
2958361.
2958361 "tids-gid-reset" main () at src/gdb/testsuite/gdb.multi/tids-gid-reset.c:21
+ (gdb) FAIL: gdb.multi/tids-gid-reset.exp: single-inferior: after restart: info threads -gid
and:
Core was generated by `build/gdb/testsuite/outputs/gdb.reverse/sigall-precsave/si'.
Program terminated with signal SIGTRAP, Trace/breakpoint trap.
#0 gen_ABRT () at src/gdb/testsuite/gdb.reverse/sigall-reverse.c:398
398 kill (getpid (), SIGABRT);
+[Current thread is 1 (LWP
2662066)]
Restored records from core file build/gdb/testsuite/outputs/gdb.reverse/sigall-precsave/sigall.precsave.
#0 gen_ABRT () at src/gdb/testsuite/gdb.reverse/sigall-reverse.c:398
398 kill (getpid (), SIGABRT);
continue
Continuing.
-Program received signal SIGABRT, Aborted.
+Thread 1 received signal SIGABRT, Aborted.
0x00007ffff7dfd55b in kill () at ../sysdeps/unix/syscall-template.S:78
78 ../sysdeps/unix/syscall-template.S: No such file or directory.
-(gdb) PASS: gdb.reverse/sigall-precsave.exp: sig-test-1: get signal ABRT
+(gdb) FAIL: gdb.reverse/sigall-precsave.exp: sig-test-1: get signal ABRT
I.e., GDB was failing to restart the thread counter back to 1, because
the previous_thread thread was being help due to the strong reference.
Tested on GNU/Linux native, gdbserver and gdbserver + "maint set
target-non-stop on".
gdb/ChangeLog:
yyyy-mm-dd Pedro Alves <pedro@palves.net>
* infcmd.c (kill_command, detach_command, disconnect_command):
Call update_previous_thread.
* infrun.c (previous_inferior_ptid): Delete.
(previous_thread): New.
(update_previous_thread): New.
(proceed, init_wait_for_inferior): Call update_previous_thread.
(normal_stop): Adjust to compare previous_thread and
inferior_thread. Call update_previous_thread.
* infrun.h (update_previous_thread): Declare.
* target.c (target_pre_inferior, target_preopen): Call
update_previous_thread.
Change-Id: I42779a1ee51a996fa1e8f6e1525c6605dbfd42c7
Pedro Alves [Sat, 3 Dec 2022 16:20:51 +0000 (16:20 +0000)]
Tweak "Using the running image of ..." output
Currently, "info files" and "info program" on a few native targets
show:
(gdb) info files
Symbols from "/home/pedro/gdb/tests/threads".
Native process:
Using the running image of child Thread 0x7ffff7d89740 (LWP
1097968).
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...
(gdb) info program
Using the running image of child Thread 0x7ffff7d89740 (LWP
1097968).
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Program stopped at 0x555555555278.
...
This patch changes them to:
(gdb) info files
Symbols from "/home/pedro/gdb/tests/threads".
Native process:
Using the running image of child process
1097968.
^^^^^^^^^^^^^^^
...
(gdb) info program
Using the running image of child process
1097968.
^^^^^^^^^^^^^^^
Program stopped at 0x555555555278.
...
... which I think makes a lot more sense in this context. The "info
program" manual entry even says:
"Display information about the status of your program: whether it is
running or not, what process it is, and why it stopped."
^^^^^^^^^^^^^
This change affects ptrace targets, procfs targets, and Windows.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I6aab061ff494a84ba3398cf98fd49efd7a6ec1ca
Simon Marchi [Mon, 27 Feb 2023 01:14:03 +0000 (20:14 -0500)]
gdb: make-target-delegates.py: add type annotations
Fixes all warnings given by pyright.
Change-Id: I480521bfc62960c4eccd9d32c886392b05a1ddaa
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:14:02 +0000 (20:14 -0500)]
gdb: make-target-delegates.py: add Entry type
Add the Entry type and use it in the `entries` map, rather than using an
ad-hoc str -> str map that comes from the re.match. This will make it
easier to make typing work in a subsequent patch, but it also helps
readers know what attributes exist for entries, which is not clear
currently.
Change-Id: I5b58dee1ed7ae85987b99bd417e641ede718624c
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:14:01 +0000 (20:14 -0500)]
gdb: make-target-delegates.py: make one string raw
Fixes the following flake8 warning:
make-target-delegates.py:36:39: W605 invalid escape sequence '\s'
Change-Id: I25eeb296f55765e17e5217a2d1e49018f63a3acd
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:14:00 +0000 (20:14 -0500)]
gdb: gdbarch*.py, copyright.py: add type annotations
Add type annotations to gdbarch*.py to fix all errors shown by pyright.
There is one change in copyright.py too, to fix this one:
/home/simark/src/binutils-gdb/gdb/gdbarch.py
/home/simark/src/binutils-gdb/gdb/gdbarch.py:206:13 - error: Type of "copyright" is partially unknown
Type of "copyright" is "(tool: Unknown, description: Unknown) -> str" (reportUnknownMemberType)
Change-Id: Ia109b53e267f6e2f5bd79a1288d0d5c9508c9ac4
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:59 +0000 (20:13 -0500)]
gdb: split gdbarch component types to gdbarch_types.py
Editing gdbarch-components.py is not an experience in an editor that is
minimally smart about Python. Because gdbarch-components.py is read and
exec'd by gdbarch.py, it doesn't import the Info / Method / Function /
Value types. And because these types are defined in gdbarch.py, it
can't import them, as that would make a cyclic dependency.
Solve this by introducing a third file, gdbarch_types.py, to define
these types. Make gdbarch.py and gdbarch-components.py import it.
Also, replace the read & exec of gdbarch-components.py by a regular
import. For this to work though, gdbarch-components.py needs to be
renamed to gdbarch_components.py.
Change-Id: Ibe994d56ef9efcc0698b3ca9670d4d9bf8bbb853
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:58 +0000 (20:13 -0500)]
gdb: pyproject.toml: set pyright typeCheckingMode = "strict"
While working on other projects, I found the pyright type checker very
helpful when editing Python code. I don't think I have to explain the
advantages of type checking to a crowd used to C/C++.
Setting typeCheckingMode to "strict" makes pyright flag a bit more type
issues than the default of "basic".
Change-Id: I38818ec59f7f73c2ab020cc9226286cdd485abc7
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:57 +0000 (20:13 -0500)]
gdb: gdbarch.py: remove Info.__init__
Info.__init__ currently assigns `self.predicate = None`. This was
helpful to ensure that all component types had a `predicate` attribute.
The generator code could then avoid having code like "if the component
is anything but Info, use predicate". Since the previous commit, all
component types have a predicate attribute which defaults to False. We
can therefore remove the assignment in Info.__init__, and in turn remove
Info.__init__. We however need to make the printer parameter of
_Component.__init__ optional, as Info don't need a printer.
Change-Id: I611edeca9cc9837eb49dddfe038595e1ff3b7239
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:56 +0000 (20:13 -0500)]
gdb: gdbarch.py: spell out parameters of _Component.__init__
The way _Component uses kwargs is handy to save a few characters, but it
doesn't play well with static analysis. When editing gdbarch.py, my
editor (which uses pylance under the hood) knows nothing about the
properties of components. So it's full of squiggly lines, and typing
analysis (which I find really helpful) doesn't work. I therefore think
it would be better to spell out the parameters.
Change-Id: Iaf561beb0d0fbe170ce1c79252a291e0945e1830
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:55 +0000 (20:13 -0500)]
gdb: reformat Python files with black 23.1.0
Change-Id: Ie8ec8870a16d71c5858f5d08958309d23c318302
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Simon Marchi [Mon, 27 Feb 2023 01:13:54 +0000 (20:13 -0500)]
gdb: remove invalid / dead code from gdbarch.py
My editor flagged that the variable `c` (in the lines removed by this
patch) was unknown. I guess it ends up working because there is a `c`
variable in the global scope. I tried putting `assert False` inside
that if, and it is not hit, showing that we never enter this if. So,
remove it. There is no change in the generated files.
Change-Id: Id3b9f67719e88cada7c6fde673c8d7842ab13617
Reviewed-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Tom Tromey [Thu, 9 Feb 2023 19:12:42 +0000 (12:12 -0700)]
Fix crash with "finish" in Rust
PR rust/30090 points out that a certain "finish" in a Rust program
will cause gdb to crash. This happens due to some confusion about
field indices in rust_language::print_enum. The fix is to use
value_primitive_field so that the correct type can be passed; other
spots in rust-lang.c already do this.
Note that the enclosed test case comes with an xfail. This is needed
because for this function, rustc doesn't follow the platform ABI.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30090
Tom Tromey [Wed, 8 Feb 2023 18:26:24 +0000 (11:26 -0700)]
Remove old GNU indent directives
Now that gdb_indent.sh has been removed, I think it makes sense to
also remove the directives intended for GNU indent.
Tom Tromey [Wed, 4 Jan 2023 16:36:59 +0000 (09:36 -0700)]
Handle range types in ax-gdb.c
A range type can usually be treated the same as its underlying integer
type, at least for the purposes of agent expressions. This patch
arranges for range types to be handled this way in ax-gdb.c, letting a
somewhat larger subset of Ada expressions be compiled.
Tom Tromey [Wed, 21 Dec 2022 18:52:37 +0000 (11:52 -0700)]
Implement some agent expressions for Ada
Ada historically has not implemented agent expressions, and some Ada
constructs probably cannot reasonably be converted to agent
expressions. However, a subset of simple operations can be, and this
patch represents a first step in that direction.
On one internal AdaCore test case, this improves the performance of a
conditional breakpoint from 5 minutes to 5 seconds.
The main tricky part in this patch is ensuring the converted
expressions detect the cases that will not work. This is done by
examining the code in the corresponding evaluation methods.
Pedro Alves [Fri, 24 Feb 2023 18:58:31 +0000 (18:58 +0000)]
Regenerate Linux syscall group info
This commit makes use of the new script to regenerate the Linux
syscall group info against strace git hash
e88e5e9ae6da68f22d15f9be3193b1412ac9aa02.
Like so:
$ cd gdb/syscalls/
$ ./update-linux-defaults.sh ~/strace.git/
Generating linux-defaults.xml.in
$ make
for f in aarch64-linux.xml amd64-linux.xml arm-linux.xml bfin-linux.xml \
i386-linux.xml mips-n32-linux.xml mips-n64-linux.xml \
mips-o32-linux.xml ppc64-linux.xml ppc-linux.xml s390-linux.xml \
s390x-linux.xml sparc64-linux.xml sparc-linux.xml; do \
xsltproc --output $f apply-defaults.xsl $f.in; \
done
The result is that a lot more syscalls end up assigned to groups.
Some lose their group info, but that just mirrors what strace does.
The gdb/syscalls/linux-defaults.xml.in file shows a large diff because
the new version is ASCII sorted, while the current version was
somewhat (but not consistently) sorted by "family" of syscalls.
If I sort the old file and diff against the new, the difference is
like this:
<syscall name="accept4" groups="network"/>
<syscall name="accept" groups="network"/>
<syscall name="access" groups="file"/>
<syscall name="acct" groups="file"/>
- <syscall name="arch_prctl" groups="process"/>
<syscall name="bind" groups="network"/>
+ <syscall name="bpf" groups="descriptor"/>
<syscall name="break" groups="memory"/>
<syscall name="brk" groups="memory"/>
+ <syscall name="bsd43_fstatfs" groups="descriptor"/>
+ <syscall name="bsd43_fstat" groups="descriptor"/>
+ <syscall name="bsd43_killpg" groups="process"/>
+ <syscall name="bsd43_kill" groups="process"/>
+ <syscall name="bsd43_lstat" groups="file"/>
+ <syscall name="bsd43_madvise" groups="memory"/>
+ <syscall name="bsd43_mincore" groups="memory"/>
+ <syscall name="bsd43_mmap" groups="descriptor,memory"/>
+ <syscall name="bsd43_mprotect" groups="memory"/>
+ <syscall name="bsd43_mremap" groups="memory"/>
+ <syscall name="bsd43_munmap" groups="memory"/>
+ <syscall name="bsd43_oldfstat" groups="descriptor"/>
+ <syscall name="bsd43_oldstat" groups="file"/>
+ <syscall name="bsd43_quotactl" groups="file"/>
+ <syscall name="bsd43_sbreak" groups="memory"/>
+ <syscall name="bsd43_sbrk" groups="memory"/>
+ <syscall name="bsd43_statfs" groups="file"/>
+ <syscall name="bsd43_stat" groups="file"/>
+ <syscall name="cacheflush" groups="memory"/>
<syscall name="chdir" groups="file"/>
<syscall name="chmod" groups="file"/>
<syscall name="chown32" groups="file"/>
<syscall name="chown" groups="file"/>
<syscall name="chroot" groups="file"/>
+ <syscall name="clone2" groups="process"/>
+ <syscall name="clone3" groups="process"/>
<syscall name="clone" groups="process"/>
<syscall name="close" groups="descriptor"/>
<syscall name="connect" groups="network"/>
+ <syscall name="copy_file_range" groups="descriptor"/>
<syscall name="creat" groups="descriptor,file"/>
<syscall name="dup2" groups="descriptor"/>
<syscall name="dup3" groups="descriptor"/>
@@ -28,14 +52,17 @@
<syscall name="epoll_create1" groups="descriptor"/>
<syscall name="epoll_create" groups="descriptor"/>
<syscall name="epoll_ctl" groups="descriptor"/>
+ <syscall name="epoll_pwait2" groups="descriptor"/>
<syscall name="epoll_pwait" groups="descriptor"/>
<syscall name="epoll_wait" groups="descriptor"/>
<syscall name="eventfd2" groups="descriptor"/>
<syscall name="eventfd" groups="descriptor"/>
+ <syscall name="execveat" groups="descriptor,file,process"/>
<syscall name="execve" groups="file,process"/>
<syscall name="execv" groups="file,process"/>
<syscall name="exit_group" groups="process"/>
<syscall name="exit" groups="process"/>
+ <syscall name="faccessat2" groups="descriptor,file"/>
<syscall name="faccessat" groups="descriptor,file"/>
<syscall name="fadvise64_64" groups="descriptor"/>
<syscall name="fadvise64" groups="descriptor"/>
@@ -57,7 +84,11 @@
<syscall name="flock" groups="descriptor"/>
<syscall name="fork" groups="process"/>
<syscall name="fremovexattr" groups="descriptor"/>
+ <syscall name="fsconfig" groups="descriptor,file"/>
<syscall name="fsetxattr" groups="descriptor"/>
+ <syscall name="fsmount" groups="descriptor"/>
+ <syscall name="fsopen" groups="descriptor"/>
+ <syscall name="fspick" groups="descriptor,file"/>
<syscall name="fstat64" groups="descriptor"/>
<syscall name="fstatat64" groups="descriptor,file"/>
<syscall name="fstatfs64" groups="descriptor"/>
@@ -72,16 +103,26 @@
<syscall name="getdents" groups="descriptor"/>
<syscall name="get_mempolicy" groups="memory"/>
<syscall name="getpeername" groups="network"/>
+ <syscall name="getpmsg" groups="network"/>
<syscall name="getsockname" groups="network"/>
<syscall name="getsockopt" groups="network"/>
<syscall name="getxattr" groups="file"/>
- <syscall name="inotify_add_watch" groups="descriptor"/>
+ <syscall name="inotify_add_watch" groups="descriptor,file"/>
<syscall name="inotify_init1" groups="descriptor"/>
<syscall name="inotify_init" groups="descriptor"/>
<syscall name="inotify_rm_watch" groups="descriptor"/>
<syscall name="ioctl" groups="descriptor"/>
+ <syscall name="io_destroy" groups="memory"/>
+ <syscall name="io_setup" groups="memory"/>
+ <syscall name="io_uring_enter" groups="descriptor,signal"/>
+ <syscall name="io_uring_register" groups="descriptor,memory"/>
+ <syscall name="io_uring_setup" groups="descriptor"/>
<syscall name="ipc" groups="ipc"/>
- <syscall name="kill" groups="signal"/>
+ <syscall name="kexec_file_load" groups="descriptor"/>
+ <syscall name="kill" groups="signal,process"/>
+ <syscall name="landlock_add_rule" groups="descriptor"/>
+ <syscall name="landlock_create_ruleset" groups="descriptor"/>
+ <syscall name="landlock_restrict_self" groups="descriptor"/>
<syscall name="lchown32" groups="file"/>
<syscall name="lchown" groups="file"/>
<syscall name="lgetxattr" groups="file"/>
@@ -98,19 +139,31 @@
<syscall name="lstat" groups="file"/>
<syscall name="madvise" groups="memory"/>
<syscall name="mbind" groups="memory"/>
+ <syscall name="memfd_create" groups="descriptor"/>
+ <syscall name="memfd_secret" groups="descriptor"/>
<syscall name="migrate_pages" groups="memory"/>
<syscall name="mincore" groups="memory"/>
<syscall name="mkdirat" groups="descriptor,file"/>
<syscall name="mkdir" groups="file"/>
<syscall name="mknodat" groups="descriptor,file"/>
<syscall name="mknod" groups="file"/>
+ <syscall name="mlock2" groups="memory"/>
<syscall name="mlockall" groups="memory"/>
<syscall name="mlock" groups="memory"/>
<syscall name="mmap2" groups="descriptor,memory"/>
<syscall name="mmap" groups="descriptor,memory"/>
+ <syscall name="mount_setattr" groups="descriptor,file"/>
<syscall name="mount" groups="file"/>
+ <syscall name="move_mount" groups="descriptor,file"/>
<syscall name="move_pages" groups="memory"/>
<syscall name="mprotect" groups="memory"/>
+ <syscall name="mq_getsetattr" groups="descriptor"/>
+ <syscall name="mq_notify" groups="descriptor"/>
+ <syscall name="mq_open" groups="descriptor"/>
+ <syscall name="mq_timedreceive" groups="descriptor"/>
+ <syscall name="mq_timedreceive_time64" groups="descriptor"/>
+ <syscall name="mq_timedsend" groups="descriptor"/>
+ <syscall name="mq_timedsend_time64" groups="descriptor"/>
<syscall name="mremap" groups="memory"/>
<syscall name="msgctl" groups="ipc"/>
<syscall name="msgget" groups="ipc"/>
@@ -126,45 +179,98 @@
<syscall name="oldfstat" groups="descriptor"/>
<syscall name="oldlstat" groups="file"/>
<syscall name="oldstat" groups="file"/>
+ <syscall name="oldumount" groups="file"/>
+ <syscall name="openat2" groups="descriptor,file"/>
<syscall name="openat" groups="descriptor,file"/>
<syscall name="open_by_handle_at" groups="descriptor"/>
<syscall name="open" groups="descriptor,file"/>
+ <syscall name="open_tree" groups="descriptor,file"/>
+ <syscall name="osf_fstatfs64" groups="descriptor"/>
+ <syscall name="osf_fstatfs" groups="descriptor"/>
+ <syscall name="osf_fstat" groups="descriptor"/>
+ <syscall name="osf_lstat" groups="file"/>
+ <syscall name="osf_mincore" groups="memory"/>
+ <syscall name="osf_mremap" groups="memory"/>
+ <syscall name="osf_old_fstat" groups="descriptor"/>
+ <syscall name="osf_old_killpg" groups="process"/>
+ <syscall name="osf_old_lstat" groups="file"/>
+ <syscall name="osf_old_stat" groups="file"/>
+ <syscall name="osf_sbrk" groups="memory"/>
+ <syscall name="osf_select" groups="descriptor"/>
+ <syscall name="osf_shmat" groups="ipc,memory"/>
+ <syscall name="osf_sigprocmask" groups="signal"/>
+ <syscall name="osf_statfs64" groups="file"/>
+ <syscall name="osf_statfs" groups="file"/>
+ <syscall name="osf_stat" groups="file"/>
+ <syscall name="osf_utimes" groups="file"/>
+ <syscall name="osf_wait4" groups="process"/>
<syscall name="pause" groups="signal"/>
<syscall name="perf_event_open" groups="descriptor"/>
+ <syscall name="pidfd_getfd" groups="descriptor"/>
+ <syscall name="pidfd_open" groups="descriptor"/>
+ <syscall name="pidfd_send_signal" groups="descriptor,signal,process"/>
<syscall name="pipe2" groups="descriptor"/>
<syscall name="pipe" groups="descriptor"/>
<syscall name="pivot_root" groups="file"/>
+ <syscall name="pkey_mprotect" groups="memory"/>
<syscall name="poll" groups="descriptor"/>
+ <syscall name="posix_fstatfs" groups="descriptor"/>
+ <syscall name="posix_fstat" groups="descriptor"/>
+ <syscall name="posix_kill" groups="process"/>
+ <syscall name="posix_lstat" groups="file"/>
+ <syscall name="posix_madvise" groups="memory"/>
+ <syscall name="posix_mmap" groups="descriptor,memory"/>
+ <syscall name="posix_munmap" groups="memory"/>
+ <syscall name="posix_sbreak" groups="memory"/>
+ <syscall name="posix_SGI_madvise" groups="memory"/>
+ <syscall name="posix_SGI_mmap" groups="descriptor,memory"/>
+ <syscall name="posix_SGI_mprotect" groups="memory"/>
+ <syscall name="posix_SGI_msync" groups="memory"/>
+ <syscall name="posix_SGI_munmap" groups="memory"/>
+ <syscall name="posix_statfs" groups="file"/>
+ <syscall name="posix_stat" groups="file"/>
<syscall name="ppoll" groups="descriptor"/>
+ <syscall name="ppoll_time64" groups="descriptor"/>
<syscall name="pread64" groups="descriptor"/>
<syscall name="pread" groups="descriptor"/>
+ <syscall name="preadv2" groups="descriptor"/>
<syscall name="preadv" groups="descriptor"/>
+ <syscall name="process_madvise" groups="descriptor"/>
+ <syscall name="process_mrelease" groups="descriptor"/>
<syscall name="pselect6" groups="descriptor"/>
+ <syscall name="pselect6_time64" groups="descriptor"/>
+ <syscall name="putpmsg" groups="network"/>
<syscall name="pwrite64" groups="descriptor"/>
<syscall name="pwrite" groups="descriptor"/>
+ <syscall name="pwritev2" groups="descriptor"/>
<syscall name="pwritev" groups="descriptor"/>
+ <syscall name="quotactl_fd" groups="descriptor"/>
<syscall name="quotactl" groups="file"/>
<syscall name="readahead" groups="descriptor"/>
<syscall name="readdir" groups="descriptor"/>
- <syscall name="read" groups="descriptor"/>
<syscall name="readlinkat" groups="descriptor,file"/>
<syscall name="readlink" groups="file"/>
+ <syscall name="read" groups="descriptor"/>
<syscall name="readv" groups="descriptor"/>
<syscall name="recvfrom" groups="network"/>
- <syscall name="recv" groups="network"/>
+ <syscall name="recvmmsg_time64" groups="network"/>
<syscall name="recvmmsg" groups="network"/>
<syscall name="recvmsg" groups="network"/>
+ <syscall name="recv" groups="network"/>
<syscall name="remap_file_pages" groups="memory"/>
<syscall name="removexattr" groups="file"/>
+ <syscall name="renameat2" groups="descriptor,file"/>
<syscall name="renameat" groups="descriptor,file"/>
<syscall name="rename" groups="file"/>
+ <syscall name="riscv_flush_icache" groups="memory"/>
<syscall name="rmdir" groups="file"/>
<syscall name="rt_sigaction" groups="signal"/>
<syscall name="rt_sigpending" groups="signal"/>
<syscall name="rt_sigprocmask" groups="signal"/>
- <syscall name="rt_sigqueueinfo" groups="signal"/>
+ <syscall name="rt_sigqueueinfo" groups="signal,process"/>
<syscall name="rt_sigreturn" groups="signal"/>
<syscall name="rt_sigsuspend" groups="signal"/>
+ <syscall name="rt_sigtimedwait_time64" groups="signal"/>
<syscall name="rt_sigtimedwait" groups="signal"/>
<syscall name="rt_tgsigqueueinfo" groups="process,signal"/>
<syscall name="select" groups="descriptor"/>
@@ -172,12 +278,14 @@
<syscall name="semget" groups="ipc"/>
<syscall name="semop" groups="ipc"/>
<syscall name="semtimedop" groups="ipc"/>
+ <syscall name="semtimedop_time64" groups="ipc"/>
<syscall name="sendfile64" groups="descriptor,network"/>
<syscall name="sendfile" groups="descriptor,network"/>
- <syscall name="send" groups="network"/>
<syscall name="sendmmsg" groups="network"/>
<syscall name="sendmsg" groups="network"/>
+ <syscall name="send" groups="network"/>
<syscall name="sendto" groups="network"/>
+ <syscall name="set_mempolicy_home_node" groups="memory"/>
<syscall name="set_mempolicy" groups="memory"/>
<syscall name="setns" groups="descriptor"/>
<syscall name="setsockopt" groups="network"/>
@@ -198,38 +306,78 @@
<syscall name="sigreturn" groups="signal"/>
<syscall name="sigsuspend" groups="signal"/>
<syscall name="socketcall" groups="descriptor"/>
- <syscall name="socket" groups="network"/>
<syscall name="socketpair" groups="network"/>
+ <syscall name="socket" groups="network"/>
<syscall name="splice" groups="descriptor"/>
<syscall name="ssetmask" groups="signal"/>
<syscall name="stat64" groups="file"/>
<syscall name="statfs64" groups="file"/>
<syscall name="statfs" groups="file"/>
<syscall name="stat" groups="file"/>
+ <syscall name="statx" groups="descriptor,file"/>
+ <syscall name="svr4_fstatfs" groups="descriptor"/>
+ <syscall name="svr4_fstat" groups="descriptor"/>
+ <syscall name="svr4_fstatvfs" groups="descriptor"/>
+ <syscall name="svr4_fxstat" groups="descriptor"/>
+ <syscall name="svr4_kill" groups="process"/>
+ <syscall name="svr4_lstat" groups="file"/>
+ <syscall name="svr4_lxstat" groups="file"/>
+ <syscall name="svr4_mincore" groups="memory"/>
+ <syscall name="svr4_mmap" groups="descriptor,memory"/>
+ <syscall name="svr4_mprotect" groups="memory"/>
+ <syscall name="svr4_munmap" groups="memory"/>
+ <syscall name="svr4_sbreak" groups="memory"/>
+ <syscall name="svr4_statfs" groups="file"/>
+ <syscall name="svr4_stat" groups="file"/>
+ <syscall name="svr4_statvfs" groups="file"/>
+ <syscall name="svr4_xstat" groups="file"/>
<syscall name="swapoff" groups="file"/>
<syscall name="swapon" groups="file"/>
<syscall name="symlinkat" groups="descriptor,file"/>
<syscall name="symlink" groups="file"/>
+ <syscall name="sync_file_range2" groups="descriptor"/>
<syscall name="sync_file_range" groups="descriptor"/>
<syscall name="syncfs" groups="descriptor"/>
+ <syscall name="sysv_brk" groups="memory"/>
+ <syscall name="sysv_fstatfs" groups="descriptor"/>
+ <syscall name="sysv_fstat" groups="descriptor"/>
+ <syscall name="sysv_fstatvfs" groups="descriptor"/>
+ <syscall name="sysv_fxstat" groups="descriptor"/>
+ <syscall name="sysv_kill" groups="process"/>
+ <syscall name="sysv_lstat" groups="file"/>
+ <syscall name="sysv_lxstat" groups="file"/>
+ <syscall name="sysv_madvise" groups="memory"/>
+ <syscall name="sysv_mmap64" groups="descriptor,memory"/>
+ <syscall name="sysv_mmap" groups="descriptor,memory"/>
+ <syscall name="sysv_mprotect" groups="memory"/>
+ <syscall name="sysv_msync" groups="memory"/>
+ <syscall name="sysv_munmap" groups="memory"/>
+ <syscall name="sysv_quotactl" groups="file"/>
+ <syscall name="sysv_statfs" groups="file"/>
+ <syscall name="sysv_stat" groups="file"/>
+ <syscall name="sysv_statvfs" groups="file"/>
+ <syscall name="sysv_xstat" groups="file"/>
<syscall name="tee" groups="descriptor"/>
- <syscall name="tgkill" groups="signal"/>
+ <syscall name="tgkill" groups="signal,process"/>
<syscall name="timerfd_create" groups="descriptor"/>
+ <syscall name="timerfd_gettime64" groups="descriptor"/>
<syscall name="timerfd_gettime" groups="descriptor"/>
- <syscall name="timerfd" groups="descriptor"/>
+ <syscall name="timerfd_settime64" groups="descriptor"/>
<syscall name="timerfd_settime" groups="descriptor"/>
- <syscall name="tkill" groups="signal"/>
+ <syscall name="timerfd" groups="descriptor"/>
+ <syscall name="tkill" groups="signal,process"/>
<syscall name="truncate64" groups="file"/>
<syscall name="truncate" groups="file"/>
<syscall name="umount2" groups="file"/>
<syscall name="umount" groups="file"/>
<syscall name="unlinkat" groups="descriptor,file"/>
<syscall name="unlink" groups="file"/>
- <syscall name="unshare" groups="process"/>
<syscall name="uselib" groups="file"/>
- <syscall name="utime" groups="file"/>
+ <syscall name="userfaultfd" groups="descriptor"/>
<syscall name="utimensat" groups="descriptor,file"/>
+ <syscall name="utimensat_time64" groups="descriptor,file"/>
<syscall name="utimes" groups="file"/>
+ <syscall name="utime" groups="file"/>
<syscall name="vfork" groups="process"/>
<syscall name="vmsplice" groups="descriptor"/>
<syscall name="wait4" groups="process"/>
Change-Id: I679d59d42fb2a914bf7a99e4c558e9696e5adff1
Pedro Alves [Fri, 24 Feb 2023 18:58:31 +0000 (18:58 +0000)]
Autogenerate gdb/syscalls/linux-defaults.xml.in (groups) from strace sources
I noticed that "catch syscall group:process" doesn't catch clone3,
while it does catch clone.
The catch syscall group information is recorded in the
gdb/syscalls/linux-defaults.xml.in file, which says:
<!-- The group field information was based on strace. -->
So I looked at the strace sources, to confirm that clone3 is in fact
recorded in the "process" group there too, and to check what other
syscalls might be missing groups.
After some digging, I found that strace records the group info in C
arrays, with entries like:
...
[ 61] = { 4, TP, SEN(wait4), "wait4" },
[ 62] = { 2, TS|TP, SEN(kill), "kill" },
[ 63] = { 1, 0, SEN(uname), "uname" },
...
You can see the current master's table for Linux x86-64 here:
https://github.com/strace/strace/blob/
e88e5e9ae6da68f22d15f9be3193b1412ac9aa02/src/linux/x86_64/syscallent.h
The column with TS|TP above is what defines each syscall's groups. So
I wrote a script that extracts this information and generates
linux-defaults.xml.in.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I679d59d42fb2a914bf7a99e4c558e9696e5adff1
Clément Chigot [Mon, 27 Feb 2023 12:57:12 +0000 (13:57 +0100)]
gas/testsuite: adjust another test for case insensitive file systems
As
1fafeaac8503eea2f61c3a35f0eef183b7e7cc65, "line.s" and "Line.s" are
identical in case insensitive file systems. Thus, gas doesn't trigger
an input file switch.
gas/ChangeLog:
* testsuite/gas/elf/dwarf-5-macro.s: Change Line.s to Line2.s.
Andrew Burgess [Mon, 20 Feb 2023 13:14:55 +0000 (13:14 +0000)]
gdb: don't treat empty enums as flag enums
In C++ it is possible to use an empty enum as a strong typedef. For
example, a user could write:
enum class my_type : unsigned char {};
Now my_type can be used like 'unsigned char' except the compiler will
not allow implicit conversion too and from the native 'unsigned char'
type.
This is used in the standard library for things like std::byte.
Currently, when GDB prints a value of type my_type, it looks like
this:
(gdb) print my_var
$1 = (unknown: 0x4)
Which isn't great. This gets worse when we consider something like:
std::vector<my_type> vec;
When using a pretty-printer, this could look like this:
std::vector of length 2, capacity 2 = {(unknown: 0x2), (unknown: 0x4)}
Clearly not great. This is described in PR gdb/30148.
The problem here is in dwarf2/read.c, we assume all enums are flag
enums unless we find an enumerator with a non-flag like value.
Clearly an empty enum contains no non-flag values, so we assume the
enum is a flag enum.
I propose adding an extra check here; that is, an empty enum should
never be a flag enum.
With this the above cases look more like:
(gdb) print my_var
$1 = 4
and:
std::vector of length 2, capacity 2 = {2, 4}
Which look much better.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30148
Reviewed-By: Tom Tromey <tom@tromey.com>
Benson Muite [Mon, 27 Feb 2023 13:35:49 +0000 (13:35 +0000)]
Do not change the timestamp when updating the gas asconfig file.
PR 28909 * doc/local.mk (asconfig.texi): Use "cp -p" to preserve timestamps. * Makefile.in: Regenerate.
Felix Willgerodt [Mon, 27 Feb 2023 13:01:06 +0000 (13:01 +0000)]
Fix missing "Core was generated by" when loading a x32 corefile.
Nick Clifton [Mon, 27 Feb 2023 12:50:31 +0000 (12:50 +0000)]
Updated Serbian translations for gold, gprof and opcodes sub-directories
Bruno Larsen [Tue, 21 Feb 2023 16:10:31 +0000 (17:10 +0100)]
gdb/testsuite: Improve testing of GDB's completion functions
When looking at some failures of gdb.linespec/cp-completion-aliases.exp,
I noticed that when a completion test will fail, it always fails with a
timeout. This is because most completion tests use gdb_test_multiple
and only add a check for the correct output. This commit adds new
options for both, tab and command completion.
For command completion, the new option will check if the prompt was
printed, and fail in this case. This is enough to know that the test has
failed because the check comes after the PASS path. For tab completion,
we have to check if GDB outputted more than just the input line, because
sometimes GDB would have printed a partial line before finishing with
the correct completion.
Approved-By: Tom Tromey <tom@tromey.com>
Tankut Baris Aktemur [Mon, 27 Feb 2023 09:28:40 +0000 (10:28 +0100)]
gdb, python: do minor modernization in execute_gdb_command
Use nullptr instead of NULL and boolify two local variables in
execute_gdb_command.
Approved-By: Tom Tromey <tom@tromey.com>
GDB Administrator [Mon, 27 Feb 2023 00:00:09 +0000 (00:00 +0000)]
Automatic date update in version.in
Tom Tromey [Sun, 26 Feb 2023 16:49:02 +0000 (09:49 -0700)]
Remove expand_symtab_containing_pc
The function expand_symtab_containing_pc is unused; remove it.
Tested by rebuilding.
GDB Administrator [Sun, 26 Feb 2023 00:00:19 +0000 (00:00 +0000)]
Automatic date update in version.in
Andrew Burgess [Thu, 23 Feb 2023 10:34:39 +0000 (10:34 +0000)]
gdb/amd64: replace xmalloc/alloca with gdb::byte_vector
Replace a couple of uses of xmalloc and alloc with a gdb::byte_vector
local variable instead.
There should be no user visible changes after this commit.
Reviewed-By: Tom Tromey <tom@tromey.com>
Andrew Burgess [Sat, 25 Feb 2023 10:16:34 +0000 (10:16 +0000)]
opcodes/m68k: enable libopcodes styling for GDB
The following commit added libopcodes styling for m68k:
commit
c22ff449275c91e4842bb10c650e83c572580f65
Date: Tue Feb 14 18:07:19 2023 +0100
opcodes: style m68k disassembler output
but didn't set disassemble_info::created_styled_output in
disassemble.c, which is needed in order for GDB to start using the
libopcodes based styling.
This commit fixes this small oversight. GDB now styles correctly.
GDB Administrator [Sat, 25 Feb 2023 00:00:12 +0000 (00:00 +0000)]
Automatic date update in version.in
Khem Raj [Thu, 23 Feb 2023 00:28:22 +0000 (16:28 -0800)]
gdbserver/linux-low.cc: Fix a typo in ternary operator
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Tom Tromey [Fri, 16 Dec 2022 19:50:29 +0000 (12:50 -0700)]
Remove struct buffer
I've long wanted to remove 'struct buffer', and thanks to Simon's
earlier patch, I was finally able to do so. My feeling has been that
gdb already has several decent structures available for growing
strings: std::string of course, but also obstack and even objalloc
from BFD and dyn-string from libiberty. The previous patches in this
series removed all the uses of struct buffer, so this one can remove
the code and the remaining #includes.
Tom Tromey [Fri, 16 Dec 2022 19:53:20 +0000 (12:53 -0700)]
Don't use struct buffer in top.c
This changes top.c to use std::string rather than struct buffer. Like
the event-top.c change, this is not completely ideal in that it
requires a copy of the string.
Tom Tromey [Fri, 16 Dec 2022 19:45:40 +0000 (12:45 -0700)]
Don't use struct buffer in event-top.c
This changes event-top.c to use std::string rather than struct buffer.
This isn't completely ideal, in that it requires a copy of the string
to be made.
Tom Tromey [Fri, 16 Dec 2022 14:59:52 +0000 (07:59 -0700)]
Don't use struct buffer in handle_qxfer_threads
This changes handle_qxfer_threads, in gdbserver, to use std::string
rather than struct buffer.
Tom Tromey [Fri, 16 Dec 2022 14:56:57 +0000 (07:56 -0700)]
Don't use struct buffer in handle_qxfer_btrace
This changes handle_qxfer_btrace and handle_qxfer_btrace_conf, in
gdbserver, to use std::string rather than struct buffer.
Tom Tromey [Fri, 16 Dec 2022 14:49:01 +0000 (07:49 -0700)]
Don't use struct buffer in handle_qxfer_traceframe_info
This changes handle_qxfer_traceframe_info, in gdbserver, to use
std::string rather than struct buffer.
Tom Tromey [Fri, 16 Dec 2022 14:42:47 +0000 (07:42 -0700)]
Remove struct buffer from tracefile-tfile.c
This changes tracefile-tfile.c to use std::string rather than struct
buffer.
Tom Tromey [Wed, 13 Apr 2022 17:25:53 +0000 (11:25 -0600)]
Write the DWARF index in the background
The new DWARF cooked indexer interacts poorly with the DWARF index
cache. In particular, the cache will require gdb to wait for the
cooked index to be finalized. As this happens in the foreground, it
means that users with this setting enabled will see a slowdown.
This patch changes gdb to write the cache entry a worker thread. (As
usual, in the absence of threads, this work is simply done immediately
in the main thread.)
Some care is taken to ensure that this can't crash, and that gdb will
not exit before the task is complete.
To avoid use-after-free problems, the DWARF per-BFD object explicitly
waits for the index cache task to complete.
To avoid gdb exiting early, an exit observer is used to wait for all
such pending tasks.
In normal use, neither of these waits will be very visible. For users
using "-batch" to pre-generate the index, though, it would be.
However I don't think there is much to be done about this, as it was
the status quo ante.
Tom Tromey [Wed, 13 Apr 2022 17:21:20 +0000 (11:21 -0600)]
Only use the per-BFD object to write a DWARF index
The DWARF index does not need access to the objfile or per-objfile
objects when writing -- it's entirely based on the objfile-independent
per-BFD data.
This patch implements this idea by changing the entire API to only be
passed the per-BFD object. This simplifies some lifetime reasoning
for the next patch.
This patch removes some code that ensures that the BFD came from a
file. It seems to me that checking for the existence of a build-id is
good enough for the index cache.
Simon Marchi [Fri, 24 Feb 2023 17:31:39 +0000 (12:31 -0500)]
gdb: fix parenthesis position in comment
Change-Id: I535b597ab4482378910570d8dd69c090419941eb
Clément Chigot [Tue, 21 Feb 2023 14:07:58 +0000 (15:07 +0100)]
testsuite: prune DOS drive letter in test outputs
On DOS systems, absolute paths start with the drive letter. This can
trigger failures in the regexp from dump tests, especially for those
checking for warnings or errors. They are usually skipping everything
before the first ":" as it has to be the file path.
| [^:]*: warning: ...
In order to avoid modifying many regexps to allow such drive letters,
prune them from all the outputs if they are found at the beginning of
a line.
binutils/ChangeLog:
* testsuite/lib/binutils-common.exp (prune_dump_output): New
(run_dump_test): Use it.
ld/ChangeLog:
* testsuite/ld-elf/noinit-sections-2.l: Remove DOS drive letter
handler.
Jan Beulich [Fri, 24 Feb 2023 13:00:11 +0000 (14:00 +0100)]
x86: allow to request ModR/M encoding
Several insns have a (typically shorter) non-ModR/M and a (typically
longer) ModR/M encoding. In most cases the former is used by default.
This isn't too dissimilar from register-only insns sometimes having two
encoding forms. In those cases {load} or {store} can be used to control
the encoding used. Extend this to ModR/M-less encodings which have a
ModR/M counterpart (note that BSWAP hasn't). For insn reading and
writing their (explicit) memory operand, both prefixes are honored;
otherwise only the applicable one is.
Note that for some forms of XCHG, {store} has already been performing
this function, apparently as an unnoticed side effect of adding D to
the template.
Jan Beulich [Fri, 24 Feb 2023 12:59:35 +0000 (13:59 +0100)]
x86: MONITOR/MWAIT are not SSE3 insns
These have their own CPUID bit and hence they should also have their own
separate control.
Jan Beulich [Fri, 24 Feb 2023 12:58:35 +0000 (13:58 +0100)]
x86-64: don't permit LAHF/SAHF with "generic64"
The feature isn't universally available on 64-bit CPUs.
Note that in i386-gen.c:isa_dependencies[] I'm only adding it to models
where I'm certain the functionality exists. For Nocona and Core I'm
uncertain in particular.
Jan Beulich [Fri, 24 Feb 2023 12:57:31 +0000 (13:57 +0100)]
x86: have insns acting on segment selector values allow for consistent operands
While MOV to/from segment register as well as selector storing insns
already permit 32- and 64-bit GPR operands, selector loading insns and
ARPL do not. Split templates accordingly.
Jan Beulich [Fri, 24 Feb 2023 12:56:57 +0000 (13:56 +0100)]
x86: restrict insn templates accepting negative 8-bit immediates
For shifts (but not ordinary rotates) and other cases where an immediate
describes e.g. a bit count or position, allowing negative operands is at
best confusing. An extreme example would be the two rotate-through-carry
insns, where a negative value would _not_ mean rotating the
corresponding number of bits in the other direction. To refuse such,
give meaning to the combination of Imm8 and Imm8S in templates (so far
these weren't used together anywhere). The issue was with
smallest_imm_type() blindly setting .imm8 for signed numbers determined
to fit in a byte.
VPROT{B,W,D,Q} is a little special: The rotate count there is a signed
quantity, so Imm8 is replaced by Imm8S. Adjust affected testcases
accordingly as well.
Another small adjustment to the testsuite is necessary: AAM and AAD were
never sensible to use with 0xffffff90 operands. This should have been an
error.
Tom de Vries [Fri, 24 Feb 2023 12:52:12 +0000 (13:52 +0100)]
[gdb/testsuite] Cleanup unnecessary expr from require line
In a recent commit I've added:
...
require {expr [have_compile_flag -fsplit-stack]}
...
but actually the expr bit is unnecessary, and we can just use:
...
require {have_compile_flag -fsplit-stack}
...
Reported-By: Tom Tromey <tom@tromey.com>
Maciej W. Rozycki [Fri, 24 Feb 2023 12:37:22 +0000 (12:37 +0000)]
GDB: Fix out of bounds accesses with limited-length values
Fix accesses to limited-length values in `contents_copy_raw' and
`contents_copy_raw_bitwise' so that they observe the limit of the
original allocation.
Reported by Simon Marchi as a heap-buffer-overflow AddressSanitizer
issue triggered with gdb.ada/limited-length.exp.
Approved-By: Simon Marchi <simon.marchi@efficios.com>
Nick Clifton [Fri, 24 Feb 2023 12:25:50 +0000 (12:25 +0000)]
Enhance better_fit() function to prefer function symbols over non-function symbols.
Alan Modra [Thu, 23 Feb 2023 07:53:12 +0000 (18:23 +1030)]
PR30155, ld segfault in _bfd_nearby_section
The segfault was a symptom of messing with the absolute section next
field, confusing bfd_section_removed_from_list in linker.c:fix_syms.
That's not all that was going wrong. The INSERT list of output
sections was being inserted into itself, ie. lost from the main
list of linker statements.
PR 30155
* ldlang.c (process_insert_statements): Handle pathological
case of the insert script being inserted before the first
output section statement in the default script.
(output_prev_sec_find): Don't test section owner here.
(insert_os_after): Change parameter to a list union pointer.
(lang_insert_orphan): Test section owner here and adjust
insert_os_after call.
Fangrui Song [Fri, 24 Feb 2023 06:11:14 +0000 (22:11 -0800)]
RISC-V: Add --[no-]relax-gp to ld
--relax enables all relaxations. --no-relax-gp disables GP relaxation to
allow measuring its effect.
The option can test effectiveness of GP relaxation and support some ABI
variants that use GP for other purposes.
Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/issues/298
bfd/
* elfnn-riscv.c (struct riscv_elf_link_hash_table): Add params.
(riscv_elfNN_set_options): New.
(riscv_info_to_howto_rela): Check relax_gp.
(_bfd_riscv_relax_section): Likewise.
* elfxx-riscv.h (struct riscv_elf_params): New.
(riscv_elf32_set_options): New.
(riscv_elf64_set_options): New.
ld/
* emultempl/riscvelf.em: Add option parsing.
* testsuite/ld-riscv-elf/code-model-relax-medlow-01-norelaxgp.d: New.
* testsuite/ld-riscv-elf/pcgp-relax-01-norelaxgp.d: New.
* testsuite/ld-riscv-elf/pcgp-relax-02.d: Test --relax --relax-gp can be
used together.
GDB Administrator [Fri, 24 Feb 2023 00:00:11 +0000 (00:00 +0000)]
Automatic date update in version.in
Palmer Dabbelt [Thu, 26 Jan 2023 23:09:29 +0000 (15:09 -0800)]
gdb/doc: The RISC-V vector registers didn't change
When we merged the GDB vector register support we did it a bit early,
just eating the risk in the very unlikely case that the vector register
names changed. They didn't, so we can now remove the caveat in the docs
that they might.
Simon Marchi [Tue, 14 Feb 2023 16:13:43 +0000 (11:13 -0500)]
gdb: remove --disable-gdbmi configure option
I noticed that the --disable-gdbmi option was broken for almost a year
(since
740b42ceb7c "gdb/python/mi: create MI commands using python").
The problem today is the python/py-cmd.c file. It is included in the
build if Python support is enabled, and it calls into some MI functions
(e.g. insert_mi_cmd_entry). If MI support is disabled, we get some
undefined symbols like:
mold: error: undefined symbol: insert_mi_cmd_entry(std::unique_ptr<mi_command, std::default_delete<mi_command> >)
>>> referenced by py-micmd.c
>>> python/py-micmd.o:(micmdpy_install_command(micmdpy_object*))
The python/py-cmd.c file should be included in the build if both Python
and MI support are enabled. It is not a case we support today, but it
could be done with a bit more configure code. However, I think we
should just remove the --disable-gdbmi option, and just include MI
support unconditionally.
Tom Tromey proposed a while ago to remove this option, but it ended
staying:
https://inbox.sourceware.org/gdb-patches/
20180628172132.28843-1-tom@tromey.com/
However, there was no strong opposition to remove it. The argument was
just "bah, it doesn't hurt anybody".
But given today's case, I would rather remove complexity rather than add
some. I couldn't find anybody caring deeply for that option, and it's
not like MI adds any external dependency. It's just a bit more code.
Removing the option will not break anybody using --disable-gdbmi (it can
be found in many build scripts [1]), since we don't flag invalid
configure flags.
So, remove the option from configure.ac, and adjust Makefile.in
accordingly to always include the MI objects in the build.
[1] https://github.com/search?q=%22--disable-gdbmi%22&type=code
Change-Id: Ifcaa8c9fc4abc6fa686ed5fd984598644f745240
Approved-By: Tom Tromey <tom@tromey.com>
Tom Tromey [Wed, 15 Feb 2023 21:57:10 +0000 (14:57 -0700)]
Fix Tcl quoting in gdb_assert
The gdb_assert proc under-quotes the expression that is passed in.
This leads to weird code in a couple of spots that tries to
compensate:
gdb_assert {{$all_regs eq $completed_regs}} ...
The fix is to add a bit of quoting when evaluating the expression.
Nick Clifton [Thu, 23 Feb 2023 17:27:07 +0000 (17:27 +0000)]
Fix _bfd_elf_find_function so that it can cope with overlapping symbols
Simon Marchi [Thu, 23 Feb 2023 16:27:23 +0000 (11:27 -0500)]
gdb: add AMDGPU header files to HFILES_NO_SRCDIR
Commit
18b4d0736bc5 ("gdb: initial support for ROCm platform (AMDGPU)
debugging") missed adding these header files to the HFILES_NO_SRCDIR
list in the Makefile. Fix that now.
Change-Id: Ifd387096aef3d147b51aefa2037da5bf6373ea64
Tom Tromey [Wed, 22 Feb 2023 22:21:45 +0000 (15:21 -0700)]
Remove 'eval' from gdb_breakpoint
Now that Tcl has the {*} operator, we can remove the use of eval from
gdb_breakpoint. Tested on x86-64 Fedora 36.
Hui Li [Thu, 16 Feb 2023 01:22:25 +0000 (09:22 +0800)]
gdb: LoongArch: Support reg aliases in info reg command
According to LoongArch ELF ABI specification [1], support the register
aliases in "info register" command.
Without this patch:
```
(gdb) info reg a0
Invalid register `a0'
```
With this patch:
```
(gdb) info reg a0
a0 0x1 1
```
[1] https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_register_convention
Signed-off-by: Hui Li <lihui@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Hui Li [Thu, 16 Feb 2023 00:59:10 +0000 (08:59 +0800)]
gdb: LoongArch: Modify the result of the info reg command
The "info register" command should only display general registers,
but it shows the information of all registers in the current code,
add loongarch_register_reggroup_p() so that we can get the expected
result.
Signed-off-by: Hui Li <lihui@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Alexey Lapshin [Thu, 23 Feb 2023 10:48:16 +0000 (10:48 +0000)]
bfd: xtensa: fix __stop_SECTION literal drop
Nick Clifton [Thu, 23 Feb 2023 09:44:50 +0000 (09:44 +0000)]
Fix the BFD library's find_nearest_line feature to produce consistent results.
PR 30150
* dwarf2.c (comp_unit_contains_address): Renamed to ... (comp_unit_may_contain_address): this,
and added code to return true if the CU's ranges have not yet been computed.
(_bfd_dwarf2_find_nearest_line_with_alt): Use the renamed function, simplifying code in the process.
Alan Modra [Thu, 23 Feb 2023 02:24:09 +0000 (12:54 +1030)]
dwarf1 .line SEC_HAS_CONTENTS
* dwarf1.c (parse_line_table): Ignore .line without SEC_HAS_CONTENTS.
Formatting.
Alan Modra [Wed, 22 Feb 2023 07:41:25 +0000 (18:11 +1030)]
ip2k: don't look at stab sections without relocs
No need to read contents if we won't do anything.
* elf32-ip2k.c (adjust_all_relocations): Skip stab sections
without relocs.
Alan Modra [Wed, 22 Feb 2023 07:07:26 +0000 (17:37 +1030)]
Test SEC_HAS_CONTENTS in relax routines
More places that generally expect instructions, so not zeros.
* coff-sh.c (sh_relax_section, sh_relax_delete_bytes): Exclude
sections without SEC_HAS_CONTENTS set.
* elf-m10200.c (mn10200_elf_relax_section): Likewise.
* elf32-arc.c (arc_elf_relax_section): Likewise.
* elf32-avr.c (elf32_avr_relax_section): Likewise.
* elf32-cr16.c (elf32_cr16_relax_section): Likewise.
* elf32-crx.c (elf32_crx_relax_section): Likewise.
* elf32-epiphany.c (epiphany_elf_relax_section): Likewise.
* elf32-ft32.c (ft32_elf_relax_section): Likewise.
* elf32-h8300.c (elf32_h8_relax_section): Likewise.
* elf32-ip2k.c (ip2k_elf_relax_section): Likewise.
* elf32-m32c.c (m32c_elf_relax_section): Likewise.
* elf32-m68hc11.c (m68hc11_elf_relax_section): Likewise.
* elf32-msp430.c (msp430_elf_relax_section): Likewise.
* elf32-pru.c (pru_elf32_relax_section): Likewise.
* elf32-rl78.c (rl78_elf_relax_section): Likewise.
* elf32-rx.c (elf32_rx_relax_section): Likewise.
* elf32-sh.c (sh_elf_relax_section): Likewise.
(sh_elf_relax_delete_bytes): Likewise.
* elf32-v850.c (v850_elf_relax_section): Likewise.
* elf64-alpha.c (elf64_alpha_relax_section): Likewise.
* elf64-ia64-vms.c (elf64_ia64_relax_section): Likewise.
* elfnn-ia64.c (elfNN_ia64_relax_section): Likewise.
* elfnn-riscv.c (_bfd_riscv_relax_section): Likewise.
* elfxx-mips.c (_bfd_mips_elf_relax_section): Likewise.
Alan Modra [Tue, 21 Feb 2023 21:17:36 +0000 (07:47 +1030)]
Test SEC_HAS_CONTENTS before reading section contents
bfd_malloc_and_get_section does size sanity checking before allocating
memory and reading contents. These size checks are not done for bss
style sections, because they typically don't occupy file space and
thus can't be compared against file size. However, if you are
expecting to look at something other than a whole lot of zeros, don't
allow fuzzers to avoid the size checking.
* cofflink.c (process_embedded_commands): Don't look at
sections without SEC_HAS_CONTENTS set.
* cpu-arm.c (bfd_arm_update_notes): Likewise.
(bfd_arm_get_mach_from_notes): Likewise.
* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Likewise.
* elf-hppa.h (elf_hppa_sort_unwind): Likewise.
* elf-m10300.c (mn10300_elf_relax_section): Likewise.
* elf-sframe.c (_bfd_elf_parse_sframe): Likewise.
* elf.c (_bfd_elf_print_private_bfd_data): Likewise.
* elf32-arm.c (bfd_elf32_arm_process_before_allocation): Likewise.
* elf32-avr.c (avr_elf32_load_property_records): Likewise.
* elf32-ppc.c (_bfd_elf_ppc_set_arch): Likewise.
(ppc_elf_get_synthetic_symtab, ppc_elf_relax_section): Likewise.
* elf64-ppc.c (ppc64_elf_get_synthetic_symtab): Likewise.
(opd_entry_value, ppc64_elf_edit_opd, ppc64_elf_edit_toc): Likewise.
* elf64-x86-64.c (elf_x86_64_get_synthetic_symtab): Likewise.
* elflink.c (elf_link_add_object_symbols): Likewise.
(bfd_elf_get_bfd_needed_list): Likewise.
* elfnn-aarch64.c (get_plt_type): Likewise.
* elfxx-mips.c (_bfd_mips_elf_get_synthetic_symtab): Likewise.
* linker.c (_bfd_handle_already_linked): Likewise.
* opncls.c (bfd_get_debug_link_info_1): Likewise.
(bfd_get_alt_debug_link_info, get_build_id): Likewise.
* peXXigen.c (pe_print_idata, pe_print_pdata): Likewise.
(_bfd_XX_print_ce_compressed_pdata, pe_print_reloc): Likewise.
* pei-x86_64.c (pex64_bfd_print_pdata_section): Likewise.
* stabs.c (_bfd_link_section_stabs): Likewise.
(_bfd_discard_section_stabs): Likewise.
* xcofflink.c (_bfd_xcoff_get_dynamic_symtab_upper_bound): Likewise.
(_bfd_xcoff_canonicalize_dynamic_symtab): Likewise.
(_bfd_xcoff_get_dynamic_reloc_upper_bound): Likewise.
(_bfd_xcoff_canonicalize_dynamic_reloc): Likewise.
(xcoff_link_add_dynamic_symbols): Likewise.
(xcoff_link_check_dynamic_ar_symbols): Likewise.
(bfd_xcoff_build_dynamic_sections): Likewise.
GDB Administrator [Thu, 23 Feb 2023 00:00:26 +0000 (00:00 +0000)]
Automatic date update in version.in
Pedro Alves [Wed, 22 Feb 2023 15:40:58 +0000 (15:40 +0000)]
gdb.reverse/time-reverse.exp: test both time syscall and C time function
Instead of only testing this on systems that have a SYS_time syscall,
test it everywhere using the time(2) C function, and in addition, run
the tests again using the SYS_time syscall.
The C variant ensures that if some platform uses some syscall we are
not aware of yet, we'll still exercise it, and likely fail, at which
point we should teach GDB about the syscall.
The explicit syscall variant is useful on platforms where the C
function does not call a syscall at all by default, e.g., on some
systems the C time function wraps an implementation provided by the
vDSO.
Approved-By: Tom de Vries <tdevries@suse.de>
Change-Id: Id4b755d76577d02c46b8acbfa249d9c31b587633
Jan Beulich [Wed, 22 Feb 2023 13:12:52 +0000 (14:12 +0100)]
x86-64: LAR and LSL don't need REX.W
Just like we suppress emitting REX.W for e.g. MOV from/to segment
register, there's also no need for it for LAR and LSL - these can only
ever return 32-bit values and hence always zero-extend their results
anyway.
While there also drop the redundant Word from the first operand of
the second template each - this is already implied by Reg16.
Jan Beulich [Wed, 22 Feb 2023 13:12:24 +0000 (14:12 +0100)]
x86: optimize BT{,C,R,S} $imm,%reg
In 64-bit mode BT can have REX.W or a data size prefix dropped in
certain cases. Outside of 64-bit mode all 4 insns can have the data
size prefix dropped in certain cases.
Alan Modra [Wed, 22 Feb 2023 01:22:46 +0000 (11:52 +1030)]
set bfd_error on make_tempname or make_tempdir failure
* bucomm.c (make_tempname, make_tempdir): Set bfd_error on error.
GDB Administrator [Wed, 22 Feb 2023 00:00:23 +0000 (00:00 +0000)]
Automatic date update in version.in
Alan Modra [Tue, 21 Feb 2023 23:27:53 +0000 (09:57 +1030)]
Re: objdump read_section_stabs
Also fix ubsan "applying zero offset to null pointer".
* objdump.c (print_section_stabs): Avoid ubsan warning.
Alan Modra [Tue, 21 Feb 2023 22:34:57 +0000 (09:04 +1030)]
Re: objdump read_section_stabs
Commit
f9c36cc99518 changed (and renamed) read_section_stabs with one
difference in overall behaviour. Previously read_section_stabs would
return a NULL for an empty section, which was then treated the same as
a missing section. Now an empty section is recognized and dumped.
This leads to NULL stabp and stabs_end in print_section_stabs. Since
stabs_end - STABSIZE is then a pointer to a very large address, the
test "stabp < stabs_end - STABSIZE" succeeds.
* objdump.c (print_section_stabs): Correct STABSIZE comparison.
Alan Modra [Tue, 21 Feb 2023 21:45:26 +0000 (08:15 +1030)]
debug_link duplicate file size checks
bfd_malloc_and_get_section does these checks.
* opncls.c (bfd_get_debug_link_info_1): Don't check section
size against file size.
(bfd_get_alt_debug_link_info): Likewise.