1 /* Return backtrace of current program state. Generic version.
2 Copyright (C) 1998, 2000, 2002, 2004, 2005 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 Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the 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 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include <sigcontextinfo.h>
25 #include <bp-checks.h>
28 /* This implementation assumes a stack layout that matches the defaults
29 used by gcc's `__builtin_frame_address' and `__builtin_return_address'
30 (FP is the frame pointer register):
32 +-----------------+ +-----------------+
33 FP -> | previous FP --------> | previous FP ------>...
35 | return address | | return address |
36 +-----------------+ +-----------------+
40 /* Get some notion of the current stack. Need not be exactly the top
41 of the stack, just something somewhere in the current frame. */
42 #ifndef CURRENT_STACK_FRAME
43 # define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
46 /* By default we assume that the stack grows downward. */
51 /* By default assume the `next' pointer in struct layout points to the
52 next struct layout. */
53 #ifndef ADVANCE_STACK_FRAME
54 # define ADVANCE_STACK_FRAME(next) BOUNDED_1 ((struct layout *) (next))
57 /* By default, the frame pointer is just what we get from gcc. */
58 #ifndef FIRST_FRAME_POINTER
59 # define FIRST_FRAME_POINTER __builtin_frame_address (0)
63 __backtrace (array
, size
)
67 struct layout
*current
;
68 void *__unbounded top_frame
;
69 void *__unbounded top_stack
;
72 top_frame
= FIRST_FRAME_POINTER
;
73 top_stack
= CURRENT_STACK_FRAME
;
75 /* We skip the call to this function, it makes no sense to record it. */
76 current
= BOUNDED_1 ((struct layout
*) top_frame
);
79 if ((void *) current INNER_THAN top_stack
80 || !((void *) current INNER_THAN __libc_stack_end
))
81 /* This means the address is out of range. Note that for the
82 toplevel we see a frame pointer with value NULL which clearly is
86 array
[cnt
++] = current
->return_address
;
88 current
= ADVANCE_STACK_FRAME (current
->next
);
93 weak_alias (__backtrace
, backtrace
)
94 libc_hidden_def (__backtrace
)