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93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
/* Return backtrace of current program state. Generic version.
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Copyright (C) 1998-2015 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <execinfo.h>
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#include <signal.h>
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#include <frame.h>
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#include <sigcontextinfo.h>
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#include <ldsodefs.h>
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/* This implementation assumes a stack layout that matches the defaults
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used by gcc's `__builtin_frame_address' and `__builtin_return_address'
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(FP is the frame pointer register):
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+-----------------+ +-----------------+
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FP -> | previous FP --------> | previous FP ------>...
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| | | |
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| return address | | return address |
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+-----------------+ +-----------------+
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*/
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#ifndef CURRENT_STACK_FRAME
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# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
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#endif
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/* By default we assume that the stack grows downward. */
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#ifndef INNER_THAN
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# define INNER_THAN <
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#endif
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/* By default assume the `next' pointer in struct layout points to the
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next struct layout. */
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#ifndef ADVANCE_STACK_FRAME
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# define ADVANCE_STACK_FRAME(next) ((struct layout *) (next))
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#endif
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/* By default, the frame pointer is just what we get from gcc. */
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#ifndef FIRST_FRAME_POINTER
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# define FIRST_FRAME_POINTER __builtin_frame_address (0)
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#endif
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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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struct layout *current;
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void *top_frame;
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void *top_stack;
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int cnt = 0;
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top_frame = FIRST_FRAME_POINTER;
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top_stack = CURRENT_STACK_FRAME;
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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 *) top_frame);
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while (cnt < size)
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{
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if ((void *) current INNER_THAN top_stack
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|| !((void *) current INNER_THAN __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 = ADVANCE_STACK_FRAME (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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libc_hidden_def (__backtrace)
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