1/* simple.c -- The backtrace_simple function.
2 Copyright (C) 2012-2017 Free Software Foundation, Inc.
3 Written by Ian Lance Taylor, Google.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions are
7met:
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
21THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
25INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31POSSIBILITY 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
42struct 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
58/* Unwind library callback routine. This is passd to
59 _Unwind_Backtrace. */
60
61static _Unwind_Reason_Code
62simple_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
93int
94backtrace_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}
109