The process record code often emits unfiltered output. In some cases,
this output ought to go to gdb_stderr (but see below). In other
cases, the output is guarded by a logging variable and so ought to go
to gdb_stdlog. This patch makes these changes.
Note that in many cases, the output to stderr is followed by a
"return -1", which is how process record indicates an error. It seems
to me that calling error here would be preferable, because, in many
cases, that's all the caller does when it sees a -1. However, I
haven't made this change.
This is part of PR gdb/7233.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=7233
I noticed yesterday that if gdb output is redirected to a file, the
pager will still be active. This is irritating, because the output
isn't actually visible -- just the pager prompt. Looking in bugzilla,
I found that this had been filed 17 years ago, as PR cli/8798.
This patch fixes the bug. It changes the pagination code to query the
particular ui-file to see if paging is allowable. The ui-file
implementations are changed so that only the stdout implementation and
a tee (where one sub-file is stdout) can page.
Regression tested on x86-64 Fedora 34.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=8798
gdbtypes.h uses core_addr_eq and core_addr_hash in a weird way: taking
the address of a member and then passing this (as a void*) to these
functions.
It seems better to simply inline the ordinary code here. CORE_ADDR is
a scalar so it can be directly compared, and the identity hash
function seems safe to assume as well.
After this, core_addr_eq and core_addr_hash are unused, so this patch
removes them.
This commit ensures that the following settings are cloned from one
inferior to the new one when processing the clone-inferior command:
- inferior-tty
- environment variables
- cwd
- args
Some of those parameters can be passed as command line arguments to GDB
(-args and -tty), so one could expect the clone-inferior to respect
those flags. The following debugging session illustrates that:
gdb -nx -quiet -batch \
-ex "show args" \
-ex "show inferior-tty" \
-ex "clone-inferior" \
-ex "inferior 2" \
-ex "show args" \
-ex "show inferior-tty" \
-tty=/some/tty \
-args echo foo bar
Argument list to give program being debugged when it is started is "foo bar".
Terminal for future runs of program being debugged is "/some/tty".
[New inferior 2]
Added inferior 2.
[Switching to inferior 2 [<null>] (/bin/echo)]
Argument list to give program being debugged when it is started is "".
Terminal for future runs of program being debugged is "".
The other properties this commit copies on clone (i.e. CWD and the
environment variables) are included since they are related (in the sense
that they influence the runtime behavior of the program) even if they
cannot be directly set using command line switches.
There is a chance that this patch changes existing user workflow. I
think that this change is mostly harmless. If users want to start a new
inferior based on an existing one, they probably already propagate those
settings to the new inferior in some way.
Tested on x86_64-linux.
Change-Id: I3b1f28b662f246228b37bb24c2ea1481567b363d
In some cases, eg. riscv_pre_output_hook, gas generates out-of-order
relocations. Various places in the linker assume relocs are sorted
by increasing r_offset, which is normally the case. Provide
GAS_SORT_RELOCS to handle unsorted relocs.
bfd/
PR 28709
* elf32-nds32.c (nds32_insertion_sort): Make static.
* elf32-nds32.h (nds32_insertion_sort): Delete declaration.
gas/
PR 28709
* write.c (write_relocs): Implement reloc sorting by r_offset
when GAS_SORT_RELOCS.
* config/tc-nds32.c (compar_relent, nds32_set_section_relocs): Delete.
* config/tc-nds32.h (nds32_set_section_relocs): Don't declare.
(SET_SECTION_RELOCS): Don't define.
(GAS_SORT_RELOCS): Define.
* config/tc-riscv.h (GAS_SORT_RELOCS): Define.
Since
commit 5c3261b0e8
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Oct 16 03:49:54 2017 -0700
ELF: Call check_relocs after opening all inputs
check_relocs is called after opening all inputs.
* elf-bfd.h (elf_backend_data::check_relocs): Update comments.
Remove emultempl/linux.em whose last usage was removed by
commit c65c21e1ff
Author: Alan Modra <amodra@gmail.com>
Date: Mon Apr 16 22:14:01 2018 +0930
various i386-aout and i386-coff target removal
Also tidies some other aout leftovers in binutils-common.exp.
gdb_print_host_address is just a simple wrapper around
fprintf_filtered. However, it is readily replaced in all callers by a
combination of %s and call to host_address_to_string. This also
simplifies the code, so I think it's worthwhile to remove this
function.
Regression tested on x86-64 Fedora 64.
gdb_bfd.c contains most of gdb's BFD-related utility functions.
However, gdb_bfd_errmsg is in utils.c. It seemed better to me to move
this out of util.[ch] and into the BFD-related file instead.
Tested by rebuilding.
Maskray (Fangrui Song) had suggested me before that we should combine
multiple testcases into one file as possible as we can. So that we can
more easily understand what these test cases are testing, and easier to
maintain. Therefore, this patch rewrites all csr testcases, to make them
more clean.
gas/
* testsuite/gas/riscv/csr-fail-nonexistent.d: Renamed from
priv-reg-fail-nonexistent testcase.
* testsuite/gas/riscv/csr-fail-nonexistent.: Likewise.
* testsuite/gas/riscv/csr-fail-nonexistent.s: Likewise.
* testsuite/gas/riscv/csr-insns-pseudo-noalias.d: Renamed from
priv-reg-pseudo testcase.
* testsuite/gas/riscv/csr-insns-pseudo.d: Likewise.
* testsuite/gas/riscv/csr-insns-pseudo.s: Likewise.
* testsuite/gas/riscv/csr-insns-read-only.d: Renamed from
priv-reg-fail-read-only-02 testcase.
* testsuite/gas/riscv/csr-insns-read-only.l: Likewise.
* testsuite/gas/riscv/csr-insns-read-only.s: Likewise.
* testsuite/gas/riscv/h-ext-32.d: Moved hypervisor csrs to csr.s.
* testsuite/gas/riscv/h-ext-32.s: Likewise.
* testsuite/gas/riscv/h-ext-64.d: Likewise.
* testsuite/gas/riscv/h-ext-64.s: Likewise.
* testsuite/gas/riscv/csr.s: Renamed from priv-reg.s, and then
added the hypervisor csrs.
* testsuite/gas/riscv/csr-version-1p9p1.d: The csr testcase when
the privileged spec is 1.9.1. Also tested all invalid csr warnings
when -mcsr-check is enabled.
* testsuite/gas/riscv/csr-version-1p9p1.l: Likewise.
* testsuite/gas/riscv/csr-version-1p10.d: Likewise, but the
privileged spec is 1.10..
* testsuite/gas/riscv/csr-version-1p10.l: Likewise.
* testsuite/gas/riscv/csr-version-1p11.d: Likewise, but the
privileged spec is 1.11.
* testsuite/gas/riscv/csr-version-1p11.l: Likewise.
* testsuite/gas/riscv/csr-version-1p12.d: Likewise, but the
privileged spec is 1.12.
* testsuite/gas/riscv/csr-version-1p12.l: Likewise.
* testsuite/gas/riscv/priv-reg*: Removed or Renamed.
This makes way for a clean 1.12 based Hypervisor Ext support.
There are no known implementors of 1.9.1 H-ext. (Per Jim, kendryte k210
is based on priv spec 1.9.1, but it seems unlikely that they implemented
H-ext).
Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Nelson Chu <nelson.chu@sifive.com>
gas/
* testsuite/gas/riscv/csr-dw-regnums.d: Drop the hypervisor csrs
defined in the privileged spec 1.9.1.
* testsuite/gas/riscv/csr-dw-regnums.s: Likewise.
* testsuite/gas/riscv/priv-reg-fail-read-only-01.s: Likewise.
* testsuite/gas/riscv/priv-reg-fail-version-1p10.l: Likewise.
* testsuite/gas/riscv/priv-reg-fail-version-1p11.l: Likewise.
* testsuite/gas/riscv/priv-reg-version-1p10.d: Likewise.
* testsuite/gas/riscv/priv-reg-version-1p11.d: Likewise.
* testsuite/gas/riscv/priv-reg-version-1p9p1.d: Likewise.
* testsuite/gas/riscv/priv-reg.s: Likewise.
include/
* opcode/riscv-opc.h: Drop the hypervisor csrs defined in the
privileged spec 1.9.1.
Set of fixes to resolve some duplicate test names in the gdb.mi/
directory. There should be no real test changes after this set of
fixes, they are all either:
- Adding with_test_prefix type constructs to make test names unique,
or
- Changing the test name to be more descriptive, or better reflect
the test being run.
Bug PR gdb/28405 reports a regression when using attach with an
extended-remote target. In this case the target is not including a
thread-id in the stop packet it sends back after the attach.
The regression was introduced with this commit:
commit 8f66807b98
Date: Wed Jan 13 20:26:58 2021 -0500
gdb: better handling of 'S' packets
The problem is that when GDB processes the stop packet, it sees that
there is no thread-id and so has to "guess" which thread the stop
should apply to.
In this case the target only has one thread, so really, there's no
guessing needed, but GDB still runs through the same process, this
shouldn't cause us any problems.
However, after the above commit, GDB now expects itself to be more
internally consistent, specifically, only a thread that GDB thinks is
resumed, can be a candidate for having stopped.
It turns out that, when GDB attaches to a process through an
extended-remote target, the threads of the process being attached too,
are not, initially, marked as resumed.
And so, when GDB tries to figure out which thread the stop might apply
too, it finds no threads in the processes marked resumed, and so an
assert triggers.
In extended_remote_target::attach we create a new thread with a call
to add_thread_silent, rather than remote_target::remote_add_thread,
the reason is that calling the latter will result in a call to
'add_thread' rather than 'add_thread_silent'. However,
remote_target::remote_add_thread includes additional
actions (i.e. calling remote_thread_info::set_resumed and set_running)
which are missing from extended_remote_target::attach. These missing
calls are what would serve to mark the new thread as resumed.
In this commit I propose that we add an extra parameter to
remote_target::remote_add_thread. This new parameter will force the
new thread to be added with a call to add_thread_silent. We can now
call remote_add_thread from the ::attach method, the extra
actions (listed above) will now be performed, and the thread will be
left in the correct state.
Additionally, in PR gdb/28405, a segfault is reported. This segfault
triggers when 'set debug remote 1' is used before trying to reproduce
the original assertion failure. The cause of this is in
remote_target::select_thread_for_ambiguous_stop_reply, where we do
this:
remote_debug_printf ("first resumed thread is %s",
pid_to_str (first_resumed_thread->ptid).c_str ());
remote_debug_printf ("is this guess ambiguous? = %d", ambiguous);
gdb_assert (first_resumed_thread != nullptr);
Notice that when debug printing is on we dereference
first_resumed_thread before we assert that the pointer is not
nullptr. This is the cause of the segfault, and is resolved by moving
the assert before the debug printing code.
I've extended an existing test, ext-attach.exp, so that the original
test is run multiple times; we run in the original mode, as normal,
but also, we now run with different packets disabled in gdbserver. In
particular, disabling Tthread would trigger the assertion as it was
reported in the original bug. I also run the test in all-stop and
non-stop modes now for extra coverage, we also run the tests with
target-async enabled, and disabled.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28405
Fixes PR gdb/28681. It was observed that after using the `finish`
command an incorrect value was displayed in some cases. Specifically,
this behaviour was observed on an x86-64 target.
Consider this test program:
struct A
{
int i;
A ()
{ this->i = 0; }
A (const A& a)
{ this->i = a.i; }
};
A
func (int i)
{
A a;
a.i = i;
return a;
}
int
main ()
{
A a = func (3);
return a.i;
}
And this GDB session:
$ gdb -q ex.x
Reading symbols from ex.x...
(gdb) b func
Breakpoint 1 at 0x401115: file ex.cc, line 14.
(gdb) r
Starting program: /home/andrew/tmp/ex.x
Breakpoint 1, func (i=3) at ex.cc:14
14 A a;
(gdb) finish
Run till exit from #0 func (i=3) at ex.cc:14
main () at ex.cc:23
23 return a.i;
Value returned is $1 = {
i = -19044
}
(gdb) p a
$2 = {
i = 3
}
(gdb)
Notice how after the `finish` the contents of $1 are junk, but, when I
immediately ask for the value of `a`, I get back the correct value.
The problem here is that after the finish command GDB calls the
function amd64_return_value to figure out where the return value can
be found (on x86-64 targets anyway).
This function makes the wrong choice for the struct A in our case, as
sizeof(A) <= 8, then amd64_return_value decides that A will be
returned in a register. GDB then reads the return value register an
interprets the contents as an instance of A.
Unfortunately, A is not trivially copyable (due to its copy
constructor), and the sys-v specification for argument and return
value passing, says that any non-trivial C++ object should have space
allocated for it by the caller, and the address of this space is
passed to the callee as a hidden first argument. The callee should
then return the address of this space as the return value.
And so, the register that GDB is treating as containing an instance of
A, actually contains the address of an instance of A (in this case on
the stack), this is why GDB shows the incorrect result.
The call stack within GDB for where we actually go wrong is this:
amd64_return_value
amd64_classify
amd64_classify_aggregate
And it is in amd64_classify_aggregate that we should be classifying
the type as AMD64_MEMORY, instead of as AMD64_INTEGER as we currently
do (via a call to amd64_classify_aggregate_field).
At the top of amd64_classify_aggregate we already have this logic:
if (TYPE_LENGTH (type) > 16 || amd64_has_unaligned_fields (type))
{
theclass[0] = theclass[1] = AMD64_MEMORY;
return;
}
Which handles some easy cases where we know a struct will be placed
into memory, that is (a) the struct is more than 16-bytes in size,
or (b) the struct has any unaligned fields.
All we need then, is to add a check here to see if the struct is
trivially copyable. If it is not then we know the struct will be
passed in memory.
I originally structured the code like this:
if (TYPE_LENGTH (type) > 16
|| amd64_has_unaligned_fields (type)
|| !language_pass_by_reference (type).trivially_copyable)
{
theclass[0] = theclass[1] = AMD64_MEMORY;
return;
}
This solved the example from the bug, and my small example above. So
then I started adding some more extensive tests to the GDB testsuite,
and I ran into a problem. I hit this error:
gdbtypes.h:676: internal-error: loc_bitpos: Assertion `m_loc_kind == FIELD_LOC_KIND_BITPOS' failed.
This problem is triggered from:
amd64_classify_aggregate
amd64_has_unaligned_fields
field::loc_bitpos
Inside the unaligned field check we try to get the bit position of
each field. Unfortunately, in some cases the field location is not
FIELD_LOC_KIND_BITPOS, but is FIELD_LOC_KIND_DWARF_BLOCK.
An example that shows this bug is:
struct B
{
short j;
};
struct A : virtual public B
{
short i;
A ()
{ this->i = 0; }
A (const A& a)
{ this->i = a.i; }
};
A
func (int i)
{
A a;
a.i = i;
return a;
}
int
main ()
{
A a = func (3);
return a.i;
}
It is the virtual base class, B, that causes the problem. The base
class is represented, within GDB, as a field within A. However, the
location type for this field is a DWARF_BLOCK.
I spent a little time trying to figure out how to convert the
DWARF_BLOCK to a BITPOS, however, I realised that, in this case at
least, conversion is not needed.
The C++ standard says that a class is not trivially copyable if it has
any virtual base classes. And so, in this case, even if I could
figure out the BITPOS for the virtual base class fields, I know for
sure that I would immediately fail the trivially_copyable check. So,
lets just reorder the checks in amd64_classify_aggregate to:
if (TYPE_LENGTH (type) > 16
|| !language_pass_by_reference (type).trivially_copyable
|| amd64_has_unaligned_fields (type))
{
theclass[0] = theclass[1] = AMD64_MEMORY;
return;
}
Now, if we have a class with virtual bases we will fail quicker, and
avoid the unaligned fields check completely.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28681
While working on another patch relating to how GDB manages threads
executing and resumed state, I spotted the following code in
record-btrace.c:
executing = tp->executing ();
set_executing (proc_target, inferior_ptid, false);
id = null_frame_id;
try
{
id = get_frame_id (get_current_frame ());
}
catch (const gdb_exception &except)
{
/* Restore the previous execution state. */
set_executing (proc_target, inferior_ptid, executing);
throw;
}
/* Restore the previous execution state. */
set_executing (proc_target, inferior_ptid, executing);
return id;
I notice that we only catch the exception so we can call
set_executing, and this is the same call to set_executing that we need
to perform in the non-exception return path.
This would be much cleaner if we could use SCOPE_EXIT to avoid the
try/catch, so lets do that.
While cleaning this up, I also applied a similar patch to
record-full.c, though there's no try/catch in that case, but using
SCOPE_EXIT makes the code safe if, in the future, we do start throwing
exceptions.
There should be no user visible changes after this commit.
I noticed that the mi-async setting was not referenced from the index
in any way, this commit tries to rectify that a bit.
The @cindex lines I think are not controversial, these same index
entries are used elsewhere in the manual for async related topics (see
@node Background Execution).
The only bit that might be controversial is that I've added a @kindex
entry for 'set mi-async' when the command is documented as '-gdb-set
mi-async' (with a similar difference for the show/-gdb-show).
My reasoning here is that nothing else is indexed under -gdb-set or
-gdb-show, and as -gdb-set/-gdb-show are just the MI equivalent for
set/show anything that is documented under set/show can be adjusted
using -gdb-set/-gdbshow, and so, I've tried to keep the index
consistent for mi-async.
Convert the 'set debug lin-lwp' command to a boolean. Adds a new
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT macro, and makes use of it in one
place (linux_nat_target::stop).
The manual entry for 'set debug lin-lwp' is already vague about
exactly what arguments this command takes, and the description talks
about turning debug on and off, so I don't think there's any updates
required there.
I have updated the doc strings shown when the users enters 'help show
debug lin-lwp' or 'help show debug lin-lwp'. The old title lines used
to talk about the 'GNU/Linux lwp module', but this debug flag is now
used for any native linux target debug, so we now talk about
'GNU/Linux native target'. The body string for this setting has been
changed from 'Enables printf debugging output.' to 'When on, print
debug messages relating to the GNU/Linux native target.', the old
value looks like a cut&paste error to me.
Add new commands:
set debug threads on|off
show debug threads
Prints additional debug information relating to thread creation and
deletion.
GDB already announces when threads are created of course.... most of
the time, but sometimes threads are added silently, in which case this
debug message is the only mechanism to see the thread being added.
Also, though GDB does announce when a thread exits, it doesn't
announce when the thread object is deleted, I've added a debug message
for that.
Additionally, having message printed through the debug system will
cause the messages to be nested to an appropriate depth when other
debug sub-systems are turned on (especially things like `infrun` and
`lin-lwp`).
During review, it was suggested to change the "params" parameter from a
tuple to a list, for esthetic reasons. The empty ones are still tuples
though, they should probably be changed to be empty lists, for
consistency. It does not change anything in the script result.
Change-Id: If13c6c527aa167a5ee5b45740e5f1bda1e9517e4
Rather than trying to fix this (which would require making an assumption
on the upper half of %esp being zero), simply issue an error. While at
it, since the generated code is in conflict with -momit-lock-prefix=yes,
issue an error in that case as well.
This removes the print_spaces helper function, in favor of using the
"*%s" idiom that's already used in many places in gdb. One spot (in
symmisc.c) is changed to use print_spaces_filtered, because the rest
of that function is using filtered output. (This highlights one way
that the printf idiom is better -- this error is harder to make when
using that.)
Regression tested on x86-64 Fedora 34.
I noticed that puts_debug isn't used in the tree. git log tells me
that the last use was removed in 2015:
commit 40e0b27177
Author: Pedro Alves <palves@redhat.com>
Date: Mon Aug 24 15:40:26 2015 +0100
Delete the remaining ROM monitor targets
... and this commit mentions that the code being removed here probably
hadn't worked for 6 years prior to that.
Based on this, I'm removing puts_debug. I don't think it's useful.
Tested by rebuilding.
n_spaces keeps the spaces in a static buffer. If a caller overwrites
these, it may give an incorrect result to a subsequent caller. So,
make the return type const to help avoid this outcome.
This command adds the "exit" command as an alias for the "quit"
command, as requested in PR gdb/28406.
The documentation is also updated to mention this new command.
Tested on x86_64-linux.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28406
