| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 2005-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library. If not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <link.h> |
| 19 | #include <unwind.h> |
| 20 | |
| 21 | struct unw_eh_callback_data |
| 22 | { |
| 23 | _Unwind_Ptr pc; |
| 24 | _Unwind_Ptr exidx_start; |
| 25 | int exidx_len; |
| 26 | }; |
| 27 | |
| 28 | |
| 29 | /* Callback to determins if the PC lies within an object, and remember the |
| 30 | location of the exception index table if it does. */ |
| 31 | |
| 32 | static int |
| 33 | find_exidx_callback (struct dl_phdr_info * info, size_t size, void * ptr) |
| 34 | { |
| 35 | struct unw_eh_callback_data * data; |
| 36 | const ElfW(Phdr) *phdr; |
| 37 | int i; |
| 38 | int match; |
| 39 | _Unwind_Ptr load_base; |
| 40 | |
| 41 | data = (struct unw_eh_callback_data *) ptr; |
| 42 | load_base = info->dlpi_addr; |
| 43 | phdr = info->dlpi_phdr; |
| 44 | |
| 45 | match = 0; |
| 46 | for (i = info->dlpi_phnum; i > 0; i--, phdr++) |
| 47 | { |
| 48 | if (phdr->p_type == PT_LOAD) |
| 49 | { |
| 50 | _Unwind_Ptr vaddr = phdr->p_vaddr + load_base; |
| 51 | if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz) |
| 52 | match = 1; |
| 53 | } |
| 54 | else if (phdr->p_type == PT_ARM_EXIDX) |
| 55 | { |
| 56 | data->exidx_start = (_Unwind_Ptr) (phdr->p_vaddr + load_base); |
| 57 | data->exidx_len = phdr->p_memsz; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | return match; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | /* Find the exception index table containing PC. */ |
| 66 | |
| 67 | _Unwind_Ptr |
| 68 | __gnu_Unwind_Find_exidx (_Unwind_Ptr pc, int * pcount) |
| 69 | { |
| 70 | struct unw_eh_callback_data data; |
| 71 | |
| 72 | data.pc = pc; |
| 73 | data.exidx_start = 0; |
| 74 | if (__dl_iterate_phdr (find_exidx_callback, &data) <= 0) |
| 75 | return 0; |
| 76 | |
| 77 | *pcount = data.exidx_len / 8; |
| 78 | return data.exidx_start; |
| 79 | } |