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82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/* This test program is part of GDB, the GNU debugger.
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Copyright 2015-2020 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This is the test program loaded into GDB by the py-unwind test. */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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static void *
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swap_value (void **location, void *new_value)
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{
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void *old_value = *location;
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*location = new_value;
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return old_value;
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}
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static void
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bad_layout(void **variable_ptr, void *fp)
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{
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fprintf (stderr, "First variable should be allocated one word below "
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"the frame. Got variable's address %p, frame at %p instead.\n",
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variable_ptr, fp);
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abort();
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}
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#define MY_FRAME (__builtin_frame_address (0))
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static void
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corrupt_frame_inner (void)
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{
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/* Save outer frame address, then corrupt the unwind chain by
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setting the outer frame address in it to self. This is
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ABI-specific: the first word of the frame contains previous frame
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address in amd64. */
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void *previous_fp = swap_value ((void **) MY_FRAME, MY_FRAME);
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/* Verify the compiler allocates the first local variable one word
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below frame. This is where the test unwinder expects to find the
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correct outer frame address. */
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if (&previous_fp + 1 != (void **) MY_FRAME)
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bad_layout (&previous_fp + 1, MY_FRAME);
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/* Now restore it so that we can return. The test sets the
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breakpoint just before this happens, and GDB will not be able to
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show the backtrace without JIT reader. */
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swap_value ((void **) MY_FRAME, previous_fp); /* break backtrace-broken */
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}
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static void
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corrupt_frame_outer (void)
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{
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/* See above for the explanation of the code here. This function
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corrupts its frame, too, and then calls the inner one. */
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void *previous_fp = swap_value ((void **) MY_FRAME, MY_FRAME);
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if (&previous_fp + 1 != (void **) MY_FRAME)
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bad_layout (&previous_fp, MY_FRAME);
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corrupt_frame_inner ();
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swap_value ((void **) MY_FRAME, previous_fp);
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}
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int
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main ()
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{
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corrupt_frame_outer ();
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return 0;
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}
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