glibc/sysdeps/s390/s390-64/backtrace.c
Andreas Jaeger 90b828e6ad Update.
2001-05-22  Andreas Jaeger  <aj@suse.de>

	* sysdeps/ieee754/ldbl-128/s_log1pl.c: New file, contributed by
	Stephen L Moshier <moshier@mediaone.net>.

2001-05-22  Martin Schwidefsky  <schwidefsky@de.ibm.com>

	* sysdeps/s390/s390-32/backtrace.c: Make backtrace return the
	return addresses instead of the stack pointers.
	* sysdeps/s390/s390-64/backtrace.c: Likewise.

2001-05-21  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/unix/sysv/linux/ia64/sys/ucontext.h: Include
	bits/sigcontext.h instead of bits/sigstack.h.
	* sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h: Add
	multiple-inclusion guards.
2001-05-22 08:46:19 +00:00

81 lines
2.5 KiB
C

/* Return backtrace of current program state. 64 bit S/390 version.
Copyright (C) 2001 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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>
#include <stddef.h>
/* This is a global variable set at program start time. It marks the
highest used stack address. */
extern void *__libc_stack_end;
/* This is the stack layout we see for every non-leaf function.
size offset
%r15 -> +------------------+
8 | back chain | 0
8 | end of stack | 8
32 | scratch | 16
80 | save area r6-r15 | 48
16 | save area f4,f6 | 128
16 | empty | 144
+------------------+
r14 in the save area holds the return address.
*/
struct layout
{
long back_chain;
long end_of_stack;
long scratch[4];
long save_grps[10];
long save_fp[2];
long empty[2];
};
int
__backtrace (array, size)
void **array;
int size;
{
/* We assume that all the code is generated with frame pointers set. */
struct layout *stack;
int cnt = 0;
asm ("LGR %0,%%r15" : "=d" (stack) );
/* We skip the call to this function, it makes no sense to record it. */
stack = (struct layout *) stack->back_chain;
while (cnt < size)
{
if (stack == NULL || (void *) stack > __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++] = stack->save_grps[8];
stack = (struct layout *) stack->back_chain;
}
return cnt;
}
weak_alias (__backtrace, backtrace)