mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* Return backtrace of current program state. Generic version.
|
|
Copyright (C) 1998-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <execinfo.h>
|
|
#include <signal.h>
|
|
#include <frame.h>
|
|
#include <sigcontextinfo.h>
|
|
#include <ldsodefs.h>
|
|
|
|
/* This implementation assumes a stack layout that matches the defaults
|
|
used by gcc's `__builtin_frame_address' and `__builtin_return_address'
|
|
(FP is the frame pointer register):
|
|
|
|
+-----------------+ +-----------------+
|
|
FP -> | previous FP --------> | previous FP ------>...
|
|
| | | |
|
|
| return address | | return address |
|
|
+-----------------+ +-----------------+
|
|
|
|
*/
|
|
|
|
/* Get some notion of the current stack. Need not be exactly the top
|
|
of the stack, just something somewhere in the current frame. */
|
|
#ifndef CURRENT_STACK_FRAME
|
|
# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
|
|
#endif
|
|
|
|
/* By default we assume that the stack grows downward. */
|
|
#ifndef INNER_THAN
|
|
# define INNER_THAN <
|
|
#endif
|
|
|
|
/* By default assume the `next' pointer in struct layout points to the
|
|
next struct layout. */
|
|
#ifndef ADVANCE_STACK_FRAME
|
|
# define ADVANCE_STACK_FRAME(next) ((struct layout *) (next))
|
|
#endif
|
|
|
|
/* By default, the frame pointer is just what we get from gcc. */
|
|
#ifndef FIRST_FRAME_POINTER
|
|
# define FIRST_FRAME_POINTER __builtin_frame_address (0)
|
|
#endif
|
|
|
|
int
|
|
__backtrace (array, size)
|
|
void **array;
|
|
int size;
|
|
{
|
|
struct layout *current;
|
|
void *top_frame;
|
|
void *top_stack;
|
|
int cnt = 0;
|
|
|
|
top_frame = FIRST_FRAME_POINTER;
|
|
top_stack = CURRENT_STACK_FRAME;
|
|
|
|
/* We skip the call to this function, it makes no sense to record it. */
|
|
current = ((struct layout *) top_frame);
|
|
while (cnt < size)
|
|
{
|
|
if ((void *) current INNER_THAN top_stack
|
|
|| !((void *) current INNER_THAN __libc_stack_end))
|
|
/* This means the address is out of range. Note that for the
|
|
toplevel we see a frame pointer with value NULL which clearly is
|
|
out of range. */
|
|
break;
|
|
|
|
array[cnt++] = current->return_address;
|
|
|
|
current = ADVANCE_STACK_FRAME (current->next);
|
|
}
|
|
|
|
return cnt;
|
|
}
|
|
weak_alias (__backtrace, backtrace)
|
|
libc_hidden_def (__backtrace)
|