| /* simple.c -- The backtrace_simple function. |
| Copyright (C) 2012-2020 Free Software Foundation, Inc. |
| Written by Ian Lance Taylor, Google. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are |
| met: |
| |
| (1) Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| |
| (2) Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in |
| the documentation and/or other materials provided with the |
| distribution. |
| |
| (3) The name of the author may not be used to |
| endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. */ |
| |
| #include "config.h" |
| |
| #include "unwind.h" |
| #include "backtrace.h" |
| |
| /* The simple_backtrace routine. */ |
| |
| /* Data passed through _Unwind_Backtrace. */ |
| |
| struct backtrace_simple_data |
| { |
| /* Number of frames to skip. */ |
| int skip; |
| /* Library state. */ |
| struct backtrace_state *state; |
| /* Callback routine. */ |
| backtrace_simple_callback callback; |
| /* Error callback routine. */ |
| backtrace_error_callback error_callback; |
| /* Data to pass to callback routine. */ |
| void *data; |
| /* Value to return from backtrace. */ |
| int ret; |
| }; |
| |
| /* Unwind library callback routine. This is passd to |
| _Unwind_Backtrace. */ |
| |
| static _Unwind_Reason_Code |
| simple_unwind (struct _Unwind_Context *context, void *vdata) |
| { |
| struct backtrace_simple_data *bdata = (struct backtrace_simple_data *) vdata; |
| uintptr_t pc; |
| int ip_before_insn = 0; |
| |
| #ifdef HAVE_GETIPINFO |
| pc = _Unwind_GetIPInfo (context, &ip_before_insn); |
| #else |
| pc = _Unwind_GetIP (context); |
| #endif |
| |
| if (bdata->skip > 0) |
| { |
| --bdata->skip; |
| return _URC_NO_REASON; |
| } |
| |
| if (!ip_before_insn) |
| --pc; |
| |
| bdata->ret = bdata->callback (bdata->data, pc); |
| |
| if (bdata->ret != 0) |
| return _URC_END_OF_STACK; |
| |
| return _URC_NO_REASON; |
| } |
| |
| /* Get a simple stack backtrace. */ |
| |
| int __attribute__((noinline)) |
| backtrace_simple (struct backtrace_state *state, int skip, |
| backtrace_simple_callback callback, |
| backtrace_error_callback error_callback, void *data) |
| { |
| struct backtrace_simple_data bdata; |
| |
| bdata.skip = skip + 1; |
| bdata.state = state; |
| bdata.callback = callback; |
| bdata.error_callback = error_callback; |
| bdata.data = data; |
| bdata.ret = 0; |
| _Unwind_Backtrace (simple_unwind, &bdata); |
| return bdata.ret; |
| } |