glibc/sysdeps/powerpc/backtrace.c
Ulrich Drepper 409dfcea95 Update.
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.
1998-08-15 02:40:04 +00:00

64 lines
2.1 KiB
C

/* Return backtrace of current program state.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <execinfo.h>
/* This is the stack layout we see with every stack frame.
Note that every routine is required by the ABI to lay out the stack
like this.
+----------------+ +-----------------+
%r1 -> | %r1 last frame--------> | %r1 last frame--->... --> NULL
| | | |
| (unused) | | return address |
+----------------+ +-----------------+
*/
struct layout
{
struct layout *next;
void *return_address;
};
int
__backtrace (void **array, int size)
{
struct layout *current;
int count;
/* Force gcc to spill LR. */
asm volatile ("" : "=l"(current));
/* Get the address on top-of-stack. */
asm volatile ("lwz %0,0(1)" : "=r"(current));
for ( count = 0;
current != NULL && count < size;
current = current->next, count++)
array[count] = current->return_address;
/* It's possible the second-last stack frame can't return
(that is, it's __libc_start_main), in which case
the CRT startup code will have set its LR to 'NULL'. */
if (count > 0 && array[count-1] == NULL)
count--;
return count;
}
weak_alias (__backtrace, backtrace)