| /* Copyright (C) 2005-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <link.h> |
| #include <unwind.h> |
| |
| struct unw_eh_callback_data |
| { |
| _Unwind_Ptr pc; |
| _Unwind_Ptr exidx_start; |
| int exidx_len; |
| }; |
| |
| |
| /* Callback to determins if the PC lies within an object, and remember the |
| location of the exception index table if it does. */ |
| |
| static int |
| find_exidx_callback (struct dl_phdr_info * info, size_t size, void * ptr) |
| { |
| struct unw_eh_callback_data * data; |
| const ElfW(Phdr) *phdr; |
| int i; |
| int match; |
| _Unwind_Ptr load_base; |
| |
| data = (struct unw_eh_callback_data *) ptr; |
| load_base = info->dlpi_addr; |
| phdr = info->dlpi_phdr; |
| |
| match = 0; |
| for (i = info->dlpi_phnum; i > 0; i--, phdr++) |
| { |
| if (phdr->p_type == PT_LOAD) |
| { |
| _Unwind_Ptr vaddr = phdr->p_vaddr + load_base; |
| if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz) |
| match = 1; |
| } |
| else if (phdr->p_type == PT_ARM_EXIDX) |
| { |
| data->exidx_start = (_Unwind_Ptr) (phdr->p_vaddr + load_base); |
| data->exidx_len = phdr->p_memsz; |
| } |
| } |
| |
| return match; |
| } |
| |
| |
| /* Find the exception index table containing PC. */ |
| |
| _Unwind_Ptr |
| __gnu_Unwind_Find_exidx (_Unwind_Ptr pc, int * pcount) |
| { |
| struct unw_eh_callback_data data; |
| |
| data.pc = pc; |
| data.exidx_start = 0; |
| if (__dl_iterate_phdr (find_exidx_callback, &data) <= 0) |
| return 0; |
| |
| *pcount = data.exidx_len / 8; |
| return data.exidx_start; |
| } |