82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* Return backtrace of current program state.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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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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#include <stddef.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 layout we see for every non-leaf function.
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size offset
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%r15 -> +------------------+
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4 | back chain | 0
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4 | end of stack | 4
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8 | glue | 8
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8 | scratch | 16
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40 | save area r6-r15 | 24
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16 | save area f4,f6 | 64
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16 | empty | 80
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+------------------+
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r14 in the save area holds the return address.
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*/
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struct layout
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{
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int back_chain;
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int end_of_stack;
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int glue[2];
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int scratch[2];
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int save_grps[10];
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int save_fp[4];
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int empty[2];
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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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struct layout *stack;
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int cnt = 0;
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asm ("LR %0,%%r15" : "=d" (stack) );
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/* We skip the call to this function, it makes no sense to record it. */
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stack = (struct layout *) stack->back_chain;
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while (cnt < size)
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{
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if (stack == NULL || (void *) stack > __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++] = stack->save_grps[9];
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stack = (struct layout *) stack->back_chain;
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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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