| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com> |
| Copyright (C) 2013 Linaro Limited |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| #include "unwind_i.h" |
| |
| /* The restorer stub will always have the form: |
| |
| d2801168 movz x8, #0x8b |
| d4000001 svc #0x0 |
| */ |
| |
| PROTECTED int |
| unw_is_signal_frame (unw_cursor_t *cursor) |
| { |
| #ifdef __linux__ |
| struct cursor *c = (struct cursor *) cursor; |
| unw_word_t w0, ip; |
| unw_addr_space_t as; |
| unw_accessors_t *a; |
| void *arg; |
| int ret; |
| |
| as = c->dwarf.as; |
| a = unw_get_accessors (as); |
| arg = c->dwarf.as_arg; |
| |
| ip = c->dwarf.ip; |
| /* ANDROID support update. */ |
| /* Undo the attempt to correct the PC or we'll be pointing to the nop instead of the mov. */ |
| ip += 4; |
| /* ANDROID support update. */ |
| |
| ret = (*a->access_mem) (as, ip, &w0, 0, arg); |
| if (ret < 0) |
| /* ANDROID support update. */ |
| return 0; |
| /* End ANDROID update. */ |
| |
| /* FIXME: distinguish 32bit insn vs 64bit registers. */ |
| if (w0 != 0xd4000001d2801168) |
| return 0; |
| |
| return 1; |
| |
| #else |
| return -UNW_ENOINFO; |
| #endif |
| } |