409dfcea95
1998-08-14 10:08 Ulrich Drepper <drepper@cygnus.com> * manual/texinfo.tex: Update. 1998-08-07 Geoff Keating <geoffk@ozemail.com.au> * sysdeps/powerpc/backtrace.c: New file. 1998-08-14 Philip Blundell <pb@nexus.co.uk> * sysdeps/arm/fpu/setjmp.S: Correct value of R0 before calling sigjmp_save. * sysdeps/arm/elf/setjmp.S: Obsolete, deleted. 1998-08-11 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makefile (install-symbolic-link): Fix spelling. 1998-08-11 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * elf/elf.h (SHT_HIOS): Fix value. 1998-08-10 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * posix/regex.c (WIDE_CHAR_SUPPORT): Don't generate defined as part of the expansion, this is undefined by the standard.
64 lines
2.1 KiB
C
64 lines
2.1 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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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 the stack layout we see with every stack frame.
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Note that every routine is required by the ABI to lay out the stack
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like this.
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+----------------+ +-----------------+
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%r1 -> | %r1 last frame--------> | %r1 last frame--->... --> NULL
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| | | |
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| (unused) | | 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 (void **array, int size)
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{
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struct layout *current;
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int count;
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/* Force gcc to spill LR. */
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asm volatile ("" : "=l"(current));
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/* Get the address on top-of-stack. */
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asm volatile ("lwz %0,0(1)" : "=r"(current));
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for ( count = 0;
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current != NULL && count < size;
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current = current->next, count++)
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array[count] = current->return_address;
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/* It's possible the second-last stack frame can't return
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(that is, it's __libc_start_main), in which case
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the CRT startup code will have set its LR to 'NULL'. */
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if (count > 0 && array[count-1] == NULL)
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count--;
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return count;
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}
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weak_alias (__backtrace, backtrace)
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