72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* Return backtrace of current program state.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <execinfo.h>
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/* This is a global variable set at program start time. It marks the
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highest used stack address. */
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extern void *__libc_stack_end;
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/* This is the stack alyout we see with every stack frame.
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+-----------------+ +-----------------+
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%ebp -> | %ebp last frame--------> | %ebp last frame--->...
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| | | |
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| return address | | return address |
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+-----------------+ +-----------------+
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*/
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struct layout
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{
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struct layout *next;
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void *return_address;
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};
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int
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__backtrace (array, size)
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void **array;
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int size;
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{
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/* We assume that all the code is generated with frame pointers set. */
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register void *ebp __asm__ ("ebp");
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register void *esp __asm__ ("esp");
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struct layout *current;
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int cnt = 0;
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/* We skip the call to this function, it makes no sense to record it. */
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current = (struct layout *) ebp;
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while (cnt < size)
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{
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if ((void *) current < esp || (void *) current > __libc_stack_end)
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/* This means the address is out of range. Note that for the
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toplevel we see a frame pointer with value NULL which clearly is
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out of range. */
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break;
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array[cnt++] = current->return_address;
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current = current->next;
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}
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return cnt;
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}
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weak_alias (__backtrace, backtrace)
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