1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
/* generic backtrace() implementation shamelessly ripped from GNU libc 6 */
#ifdef __MINGW32__
/* Assume we're being compiled without -fbounding-pointers. */
#define __unbounded
#define BOUNDED_1(PTR) (PTR)
/* We set this in main() to get an approximation to the end of the stack. */
void *stack_end;
/* Taken from sysdeps/generic/frame.h: */
struct layout
{
void *__unbounded next;
void *__unbounded return_address;
};
/* Taken from sysdeps/generic/backtrace.c: */
/* Return backtrace of current program state. Generic version.
Copyright (C) 1998, 2000, 2002, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/*
#include <execinfo.h>
#include <signal.h>
#include <frame.h>
#include <sigcontextinfo.h>
#include <bp-checks.h>
#include <ldsodefs.h>
*/
/* This implementation assumes a stack layout that matches the defaults
used by gcc's `__builtin_frame_address' and `__builtin_return_address'
(FP is the frame pointer register):
+-----------------+ +-----------------+
FP -> | previous FP --------> | previous FP ------>...
| | | |
| return address | | return address |
+-----------------+ +-----------------+
*/
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
#ifndef CURRENT_STACK_FRAME
# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
#endif
/* By default we assume that the stack grows downward. */
#ifndef INNER_THAN
# define INNER_THAN <
#endif
/* By default assume the `next' pointer in struct layout points to the
next struct layout. */
#ifndef ADVANCE_STACK_FRAME
# define ADVANCE_STACK_FRAME(next) BOUNDED_1 ((struct layout *) (next))
#endif
/* By default, the frame pointer is just what we get from gcc. */
#ifndef FIRST_FRAME_POINTER
# define FIRST_FRAME_POINTER __builtin_frame_address (0)
#endif
int backtrace (void **array, int size)
{
struct layout *current;
void *__unbounded top_frame;
void *__unbounded top_stack;
int cnt = 0;
top_frame = FIRST_FRAME_POINTER;
top_stack = CURRENT_STACK_FRAME;
/* We skip the call to this function, it makes no sense to record it. */
current = BOUNDED_1 ((struct layout *) top_frame);
while (cnt < size)
{
if ((void *) current INNER_THAN top_stack
|| !((void *) current INNER_THAN 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++] = current->return_address;
current = ADVANCE_STACK_FRAME (current->next);
}
return cnt;
}
#endif // __MINGW32__
|
