1 /* Return backtrace of current program state. Generic version.
2 Copyright (C) 1998 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 /* This is a global variable set at program start time. It marks the
25 highest used stack address. */
26 extern void *__libc_stack_end;
29 /* This implementation assumes a stack layout that matches the defaults
30 used by gcc's `__builtin_frame_address' and `__builtin_return_address'
31 (FP is the frame pointer register):
33 +-----------------+ +-----------------+
34 FP -> | previous FP --------> | previous FP ------>...
36 | return address | | return address |
37 +-----------------+ +-----------------+
41 /* Get some notion of the current stack. Need not be exactly the top
42 of the stack, just something somewhere in the current frame. */
43 #ifndef CURRENT_STACK_FRAME
44 # define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
54 __backtrace (array, size)
58 struct layout *current;
63 top_frame = __builtin_frame_address (0);
64 top_stack = CURRENT_STACK_FRAME;
66 /* We skip the call to this function, it makes no sense to record it. */
67 current = (struct layout *) top_frame;
70 if ((void *) current < top_stack || (void *) current > __libc_stack_end)
71 /* This means the address is out of range. Note that for the
72 toplevel we see a frame pointer with value NULL which clearly is
76 array[cnt++] = current->return_address;
78 current = current->next;
83 weak_alias (__backtrace, backtrace)