1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/* This test program is part of GDB, the GNU debugger.
|
|
|
|
Copyright 2015-2024 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
/* This is the test program loaded into GDB by the py-unwind test. */
|
|
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
static void *
|
|
swap_value (void **location, void *new_value)
|
|
{
|
|
void *old_value = *location;
|
|
*location = new_value;
|
|
return old_value;
|
|
}
|
|
|
|
static void
|
|
bad_layout(void **variable_ptr, void *fp)
|
|
{
|
|
fprintf (stderr, "First variable should be allocated one word below "
|
|
"the frame. Got variable's address %p, frame at %p instead.\n",
|
|
variable_ptr, fp);
|
|
abort();
|
|
}
|
|
|
|
#define MY_FRAME (__builtin_frame_address (0))
|
|
|
|
static void
|
|
corrupt_frame_inner (void)
|
|
{
|
|
/* Save outer frame address, then corrupt the unwind chain by
|
|
setting the outer frame address in it to self. This is
|
|
ABI-specific: the first word of the frame contains previous frame
|
|
address in amd64. */
|
|
void *previous_fp = swap_value ((void **) MY_FRAME, MY_FRAME);
|
|
|
|
/* Verify the compiler allocates the first local variable one word
|
|
below frame. This is where the test unwinder expects to find the
|
|
correct outer frame address. */
|
|
if (&previous_fp + 1 != (void **) MY_FRAME)
|
|
bad_layout (&previous_fp + 1, MY_FRAME);
|
|
|
|
/* Now restore it so that we can return. The test sets the
|
|
breakpoint just before this happens, and GDB will not be able to
|
|
show the backtrace without JIT reader. */
|
|
swap_value ((void **) MY_FRAME, previous_fp); /* break backtrace-broken */
|
|
}
|
|
|
|
static void
|
|
corrupt_frame_outer (void)
|
|
{
|
|
/* See above for the explanation of the code here. This function
|
|
corrupts its frame, too, and then calls the inner one. */
|
|
void *previous_fp = swap_value ((void **) MY_FRAME, MY_FRAME);
|
|
if (&previous_fp + 1 != (void **) MY_FRAME)
|
|
bad_layout (&previous_fp, MY_FRAME);
|
|
corrupt_frame_inner ();
|
|
swap_value ((void **) MY_FRAME, previous_fp);
|
|
}
|
|
|
|
int
|
|
main ()
|
|
{
|
|
corrupt_frame_outer ();
|
|
return 0;
|
|
}
|