|
111
|
1 /* backtrace.c -- Entry point for stack backtrace library.
|
|
145
|
2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
|
|
111
|
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
|
|
|
10 notice, this list of conditions and the following disclaimer.
|
|
|
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
|
|
|
15 distribution.
|
|
|
16
|
|
|
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 <sys/types.h>
|
|
|
36
|
|
|
37 #include "unwind.h"
|
|
|
38 #include "backtrace.h"
|
|
|
39 #include "internal.h"
|
|
|
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;
|
|
|
59 /* Whether there is any memory available. */
|
|
|
60 int can_alloc;
|
|
|
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
|
|
|
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);
|
|
|
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
|
|
145
|
101 int __attribute__((noinline))
|
|
111
|
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;
|
|
|
107 void *p;
|
|
|
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;
|
|
|
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
|
|
|
127 _Unwind_Backtrace (unwind, &bdata);
|
|
|
128 return bdata.ret;
|
|
|
129 }
|
