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1a4d82fc | 1 | /* backtrace.c -- Entry point for stack backtrace library. |
ba9703b0 | 2 | Copyright (C) 2012-2020 Free Software Foundation, Inc. |
1a4d82fc JJ |
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 | |
94b46f34 | 10 | notice, this list of conditions and the following disclaimer. |
1a4d82fc JJ |
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 | |
94b46f34 XL |
15 | distribution. |
16 | ||
1a4d82fc JJ |
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 | ||
9cc50fc6 SL |
35 | #include <sys/types.h> |
36 | ||
1a4d82fc JJ |
37 | #include "unwind.h" |
38 | #include "backtrace.h" | |
9cc50fc6 | 39 | #include "internal.h" |
1a4d82fc JJ |
40 | |
41 | /* The main backtrace_full routine. */ | |
42 | ||
43 | /* Data passed through _Unwind_Backtrace. */ | |
44 | ||
45 | struct backtrace_data | |
46 | { | |
47 | /* Number of frames to skip. */ | |
48 | int skip; | |
49 | /* Library state. */ | |
50 | struct backtrace_state *state; | |
51 | /* Callback routine. */ | |
52 | backtrace_full_callback callback; | |
53 | /* Error callback routine. */ | |
54 | backtrace_error_callback error_callback; | |
55 | /* Data to pass to callback routines. */ | |
56 | void *data; | |
57 | /* Value to return from backtrace_full. */ | |
58 | int ret; | |
9cc50fc6 SL |
59 | /* Whether there is any memory available. */ |
60 | int can_alloc; | |
1a4d82fc JJ |
61 | }; |
62 | ||
63 | /* Unwind library callback routine. This is passed to | |
64 | _Unwind_Backtrace. */ | |
65 | ||
66 | static _Unwind_Reason_Code | |
67 | unwind (struct _Unwind_Context *context, void *vdata) | |
68 | { | |
69 | struct backtrace_data *bdata = (struct backtrace_data *) vdata; | |
70 | uintptr_t pc; | |
71 | int ip_before_insn = 0; | |
72 | ||
73 | #ifdef HAVE_GETIPINFO | |
74 | pc = _Unwind_GetIPInfo (context, &ip_before_insn); | |
75 | #else | |
76 | pc = _Unwind_GetIP (context); | |
77 | #endif | |
78 | ||
79 | if (bdata->skip > 0) | |
80 | { | |
81 | --bdata->skip; | |
82 | return _URC_NO_REASON; | |
83 | } | |
84 | ||
85 | if (!ip_before_insn) | |
86 | --pc; | |
87 | ||
9cc50fc6 SL |
88 | if (!bdata->can_alloc) |
89 | bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL); | |
90 | else | |
91 | bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback, | |
92 | bdata->error_callback, bdata->data); | |
1a4d82fc JJ |
93 | if (bdata->ret != 0) |
94 | return _URC_END_OF_STACK; | |
95 | ||
96 | return _URC_NO_REASON; | |
97 | } | |
98 | ||
99 | /* Get a stack backtrace. */ | |
100 | ||
ba9703b0 | 101 | int __attribute__((noinline)) |
1a4d82fc JJ |
102 | backtrace_full (struct backtrace_state *state, int skip, |
103 | backtrace_full_callback callback, | |
104 | backtrace_error_callback error_callback, void *data) | |
105 | { | |
106 | struct backtrace_data bdata; | |
9cc50fc6 | 107 | void *p; |
1a4d82fc JJ |
108 | |
109 | bdata.skip = skip + 1; | |
110 | bdata.state = state; | |
111 | bdata.callback = callback; | |
112 | bdata.error_callback = error_callback; | |
113 | bdata.data = data; | |
114 | bdata.ret = 0; | |
9cc50fc6 SL |
115 | |
116 | /* If we can't allocate any memory at all, don't try to produce | |
117 | file/line information. */ | |
118 | p = backtrace_alloc (state, 4096, NULL, NULL); | |
119 | if (p == NULL) | |
120 | bdata.can_alloc = 0; | |
121 | else | |
122 | { | |
123 | backtrace_free (state, p, 4096, NULL, NULL); | |
124 | bdata.can_alloc = 1; | |
125 | } | |
126 | ||
1a4d82fc JJ |
127 | _Unwind_Backtrace (unwind, &bdata); |
128 | return bdata.ret; | |
129 | } |