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1 /* simple.c -- The backtrace_simple function.
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2 Copyright (C) 2012-2020 Free Software Foundation, Inc.
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3 Written by Ian Lance Taylor, Google.
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4
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5 Redistribution and use in source and binary forms, with or without
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6 modification, are permitted provided that the following conditions are
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7 met:
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8
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9 (1) Redistributions of source code must retain the above copyright
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10 notice, this list of conditions and the following disclaimer.
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11
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12 (2) Redistributions in binary form must reproduce the above copyright
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13 notice, this list of conditions and the following disclaimer in
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14 the documentation and/or other materials provided with the
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15 distribution.
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16
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17 (3) The name of the author may not be used to
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18 endorse or promote products derived from this software without
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19 specific prior written permission.
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20
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21 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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22 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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24 DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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25 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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26 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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27 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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30 IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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31 POSSIBILITY OF SUCH DAMAGE. */
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32
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33 #include "config.h"
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34
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35 #include "unwind.h"
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36 #include "backtrace.h"
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37
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38 /* The simple_backtrace routine. */
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39
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40 /* Data passed through _Unwind_Backtrace. */
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41
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42 struct backtrace_simple_data
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43 {
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44 /* Number of frames to skip. */
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45 int skip;
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46 /* Library state. */
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47 struct backtrace_state *state;
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48 /* Callback routine. */
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49 backtrace_simple_callback callback;
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50 /* Error callback routine. */
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51 backtrace_error_callback error_callback;
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52 /* Data to pass to callback routine. */
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53 void *data;
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54 /* Value to return from backtrace. */
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55 int ret;
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56 };
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57
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58 /* Unwind library callback routine. This is passd to
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59 _Unwind_Backtrace. */
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60
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61 static _Unwind_Reason_Code
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62 simple_unwind (struct _Unwind_Context *context, void *vdata)
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63 {
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64 struct backtrace_simple_data *bdata = (struct backtrace_simple_data *) vdata;
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65 uintptr_t pc;
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66 int ip_before_insn = 0;
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67
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68 #ifdef HAVE_GETIPINFO
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69 pc = _Unwind_GetIPInfo (context, &ip_before_insn);
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70 #else
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71 pc = _Unwind_GetIP (context);
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72 #endif
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73
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74 if (bdata->skip > 0)
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75 {
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76 --bdata->skip;
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77 return _URC_NO_REASON;
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78 }
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79
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80 if (!ip_before_insn)
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81 --pc;
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82
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83 bdata->ret = bdata->callback (bdata->data, pc);
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84
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85 if (bdata->ret != 0)
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86 return _URC_END_OF_STACK;
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87
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88 return _URC_NO_REASON;
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89 }
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90
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91 /* Get a simple stack backtrace. */
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92
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93 int __attribute__((noinline))
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94 backtrace_simple (struct backtrace_state *state, int skip,
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95 backtrace_simple_callback callback,
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96 backtrace_error_callback error_callback, void *data)
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97 {
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98 struct backtrace_simple_data bdata;
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99
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100 bdata.skip = skip + 1;
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101 bdata.state = state;
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102 bdata.callback = callback;
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103 bdata.error_callback = error_callback;
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104 bdata.data = data;
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105 bdata.ret = 0;
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106 _Unwind_Backtrace (simple_unwind, &bdata);
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107 return bdata.ret;
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108 }
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