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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
/* -*- mode: C; c-file-style: "linux" -*- */
/* MemProf -- memory profiler and leak detector
* Copyright 1999, 2000, 2001, Red Hat, Inc.
* Copyright 2002, Kristian Rietveld
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*====*/
/* This code is mostly from eazel-tools/prof
*
* stack-frame.c -- hacks to read the backtrace
*
* Authors: John Harper <jsh@eazel.com>
*
* With modifications by Owen Taylor <otaylor@redhat.com> to
* add mi_call_with_signal_backtrace() and to work better within
* the MemProf framework.
*/
#include <config.h>
#include <alloca.h>
#include <string.h>
#ifdef HAVE_EXECINFO_H
# include <execinfo.h>
#endif
#include "stack-frame.h"
#if defined (HAVE_BACKTRACE)
void
mi_call_with_backtrace (int to_skip, void callback (int, void **, void *), void *data)
{
int bufsiz = 128, count;
void **buf;
again:
buf = alloca (bufsiz * sizeof (void *));
count = backtrace (buf, bufsiz);
if (count == bufsiz)
{
bufsiz = bufsiz * 2;
goto again;
}
callback (count - to_skip, buf + to_skip, data);
}
#endif
/* Magic code to chain along the stack frames
This may even work on non-386 gcc targets, but I haven't tested it.. */
#define HAVE_FRAME_ACCESSORS
#if defined (__GNUC__) && defined (__i386__)
typedef struct stack_frame_struct stack_frame;
struct stack_frame_struct {
stack_frame *next;
void *return_address;
};
static inline stack_frame *
first_frame (void)
{
return __builtin_frame_address (0);
}
static inline stack_frame *
next_frame (stack_frame *fp)
{
return (fp != 0) ? fp->next : 0;
}
static inline void *
frame_return_address (stack_frame *fp)
{
return (fp != 0) ? fp->return_address : 0;
}
#endif
#ifndef HAVE_BACKTRACE
#ifndef HAVE_FRAME_ACCESSORS
# error "Don't have stack-frame accessors for your compiler/architecture."
#endif
void
mi_call_with_backtrace (int to_skip, void callback (int, void **, void *), void *data)
{
int nframes = 64;
void **frames = alloca (sizeof (void *) * nframes);
int depth;
stack_frame *frame;
for (frame = first_frame (), depth = 0;
frame != 0;
frame = next_frame (frame), depth++)
{
void *ret = frame_return_address (frame);
if (depth == nframes)
{
void *new = alloca (sizeof (void *) * (nframes * 2));
memcpy (new, frames, nframes * sizeof (void *));
frames = new;
nframes *= 2;
}
frames[depth] = ret;
}
callback (depth - to_skip, frames + to_skip, data);
}
#endif /* !HAVE_BACKTRACE */
/**
* mi_call_with_signal_backtrace:
* @first_address: Instruction pointer from signal context
* @second_frame: Frame pointer from signal context.
* @stack_bound: Stack pointer from signal context; used as
* a rough way of detecting invalid frame pointers.
* @callback: callback function
* @data: User data to pass to @callback
*
* Calls @callback with a stack trace from the the pointer where the
* signal interupted normap execution.
**/
void
mi_call_with_signal_backtrace (void *first_address, void *second_frame, void *stack_bound,
void callback (int, void **, void *), void *data)
{
int nframes = 64;
void **frames = alloca (sizeof (void *) * nframes);
int depth;
stack_frame *frame;
frames[0] = first_address;
for (frame = second_frame, depth = 1;
(void *)frame > stack_bound;
frame = next_frame (frame), depth++)
{
void *ret = frame_return_address (frame);
if (depth == nframes)
{
void *new = alloca (sizeof (void *) * (nframes * 2));
memcpy (new, frames, nframes * sizeof (void *));
frames = new;
nframes *= 2;
}
frames[depth] = ret;
}
callback (depth, frames, data);
}
|
