]>
Commit | Line | Data |
---|---|---|
eff02e4f | 1 | /* backtrace.c -- Entry point for stack backtrace library. |
85ec4feb | 2 | Copyright (C) 2012-2018 Free Software Foundation, Inc. |
eff02e4f ILT |
3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | Redistribution and use in source and binary forms, with or without | |
6 | modification, are permitted provided that the following conditions are | |
7 | met: | |
8 | ||
9 | (1) Redistributions of source code must retain the above copyright | |
84ebf639 | 10 | notice, this list of conditions and the following disclaimer. |
eff02e4f ILT |
11 | |
12 | (2) Redistributions in binary form must reproduce the above copyright | |
13 | notice, this list of conditions and the following disclaimer in | |
14 | the documentation and/or other materials provided with the | |
84ebf639 CL |
15 | distribution. |
16 | ||
eff02e4f ILT |
17 | (3) The name of the author may not be used to |
18 | endorse or promote products derived from this software without | |
19 | specific prior written permission. | |
20 | ||
21 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
25 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
27 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
29 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
30 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | POSSIBILITY OF SUCH DAMAGE. */ | |
32 | ||
33 | #include "config.h" | |
34 | ||
83a658ca | 35 | #include <unistd.h> |
50809ff9 HPN |
36 | #include <sys/types.h> |
37 | ||
c36af1b4 ILT |
38 | #include "backtrace-supported.h" |
39 | ||
83a658ca ILT |
40 | #if !BACKTRACE_USES_MALLOC |
41 | #include <sys/mman.h> | |
42 | #endif | |
43 | ||
eff02e4f ILT |
44 | #include "unwind.h" |
45 | #include "backtrace.h" | |
c478516b | 46 | #include "internal.h" |
eff02e4f | 47 | |
83a658ca ILT |
48 | #ifndef MAP_ANONYMOUS |
49 | #define MAP_ANONYMOUS MAP_ANON | |
50 | #endif | |
51 | ||
52 | #ifndef MAP_FAILED | |
53 | #define MAP_FAILED ((void *)-1) | |
54 | #endif | |
55 | ||
eff02e4f ILT |
56 | /* The main backtrace_full routine. */ |
57 | ||
58 | /* Data passed through _Unwind_Backtrace. */ | |
59 | ||
60 | struct backtrace_data | |
61 | { | |
62 | /* Number of frames to skip. */ | |
63 | int skip; | |
64 | /* Library state. */ | |
65 | struct backtrace_state *state; | |
66 | /* Callback routine. */ | |
67 | backtrace_full_callback callback; | |
68 | /* Error callback routine. */ | |
69 | backtrace_error_callback error_callback; | |
70 | /* Data to pass to callback routines. */ | |
71 | void *data; | |
72 | /* Value to return from backtrace_full. */ | |
73 | int ret; | |
c478516b ILT |
74 | /* Whether there is any memory available. */ |
75 | int can_alloc; | |
eff02e4f ILT |
76 | }; |
77 | ||
78 | /* Unwind library callback routine. This is passed to | |
79 | _Unwind_Backtrace. */ | |
80 | ||
81 | static _Unwind_Reason_Code | |
82 | unwind (struct _Unwind_Context *context, void *vdata) | |
83 | { | |
84 | struct backtrace_data *bdata = (struct backtrace_data *) vdata; | |
85 | uintptr_t pc; | |
86 | int ip_before_insn = 0; | |
87 | ||
88 | #ifdef HAVE_GETIPINFO | |
89 | pc = _Unwind_GetIPInfo (context, &ip_before_insn); | |
90 | #else | |
91 | pc = _Unwind_GetIP (context); | |
92 | #endif | |
93 | ||
94 | if (bdata->skip > 0) | |
95 | { | |
96 | --bdata->skip; | |
97 | return _URC_NO_REASON; | |
98 | } | |
99 | ||
100 | if (!ip_before_insn) | |
101 | --pc; | |
102 | ||
c478516b ILT |
103 | if (!bdata->can_alloc) |
104 | bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL); | |
105 | else | |
106 | bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback, | |
107 | bdata->error_callback, bdata->data); | |
eff02e4f ILT |
108 | if (bdata->ret != 0) |
109 | return _URC_END_OF_STACK; | |
110 | ||
111 | return _URC_NO_REASON; | |
112 | } | |
113 | ||
114 | /* Get a stack backtrace. */ | |
115 | ||
116 | int | |
117 | backtrace_full (struct backtrace_state *state, int skip, | |
118 | backtrace_full_callback callback, | |
119 | backtrace_error_callback error_callback, void *data) | |
120 | { | |
121 | struct backtrace_data bdata; | |
122 | ||
123 | bdata.skip = skip + 1; | |
124 | bdata.state = state; | |
125 | bdata.callback = callback; | |
126 | bdata.error_callback = error_callback; | |
127 | bdata.data = data; | |
128 | bdata.ret = 0; | |
c478516b | 129 | |
83a658ca ILT |
130 | #if !BACKTRACE_USES_MALLOC |
131 | { | |
132 | size_t pagesize; | |
133 | void *page; | |
134 | ||
135 | /* If we can't allocate any memory at all, don't try to produce | |
136 | file/line information. */ | |
137 | pagesize = getpagesize (); | |
138 | page = mmap (NULL, pagesize, PROT_READ | PROT_WRITE, | |
139 | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
140 | if (page == MAP_FAILED) | |
141 | bdata.can_alloc = 0; | |
142 | else | |
143 | { | |
144 | munmap (page, pagesize); | |
145 | bdata.can_alloc = 1; | |
146 | } | |
147 | } | |
148 | #endif | |
c478516b | 149 | |
eff02e4f ILT |
150 | _Unwind_Backtrace (unwind, &bdata); |
151 | return bdata.ret; | |
152 | } |