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eff02e4f | 1 | /* simple.c -- The backtrace_simple function. |
99dee823 | 2 | Copyright (C) 2012-2021 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 | ||
35 | #include "unwind.h" | |
36 | #include "backtrace.h" | |
37 | ||
38 | /* The simple_backtrace routine. */ | |
39 | ||
40 | /* Data passed through _Unwind_Backtrace. */ | |
41 | ||
42 | struct backtrace_simple_data | |
43 | { | |
44 | /* Number of frames to skip. */ | |
45 | int skip; | |
46 | /* Library state. */ | |
47 | struct backtrace_state *state; | |
48 | /* Callback routine. */ | |
49 | backtrace_simple_callback callback; | |
50 | /* Error callback routine. */ | |
51 | backtrace_error_callback error_callback; | |
52 | /* Data to pass to callback routine. */ | |
53 | void *data; | |
54 | /* Value to return from backtrace. */ | |
55 | int ret; | |
56 | }; | |
57 | ||
494c5103 | 58 | /* Unwind library callback routine. This is passed to |
eff02e4f ILT |
59 | _Unwind_Backtrace. */ |
60 | ||
61 | static _Unwind_Reason_Code | |
62 | simple_unwind (struct _Unwind_Context *context, void *vdata) | |
63 | { | |
64 | struct backtrace_simple_data *bdata = (struct backtrace_simple_data *) vdata; | |
65 | uintptr_t pc; | |
66 | int ip_before_insn = 0; | |
67 | ||
68 | #ifdef HAVE_GETIPINFO | |
69 | pc = _Unwind_GetIPInfo (context, &ip_before_insn); | |
70 | #else | |
71 | pc = _Unwind_GetIP (context); | |
72 | #endif | |
73 | ||
74 | if (bdata->skip > 0) | |
75 | { | |
76 | --bdata->skip; | |
77 | return _URC_NO_REASON; | |
78 | } | |
79 | ||
80 | if (!ip_before_insn) | |
81 | --pc; | |
82 | ||
83 | bdata->ret = bdata->callback (bdata->data, pc); | |
84 | ||
85 | if (bdata->ret != 0) | |
86 | return _URC_END_OF_STACK; | |
87 | ||
88 | return _URC_NO_REASON; | |
89 | } | |
90 | ||
91 | /* Get a simple stack backtrace. */ | |
92 | ||
4af50e13 | 93 | int __attribute__((noinline)) |
eff02e4f ILT |
94 | backtrace_simple (struct backtrace_state *state, int skip, |
95 | backtrace_simple_callback callback, | |
96 | backtrace_error_callback error_callback, void *data) | |
97 | { | |
98 | struct backtrace_simple_data bdata; | |
99 | ||
100 | bdata.skip = skip + 1; | |
101 | bdata.state = state; | |
102 | bdata.callback = callback; | |
103 | bdata.error_callback = error_callback; | |
104 | bdata.data = data; | |
105 | bdata.ret = 0; | |
106 | _Unwind_Backtrace (simple_unwind, &bdata); | |
107 | return bdata.ret; | |
108 | } |