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80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <link.h>
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#include <unwind.h>
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struct unw_eh_callback_data
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{
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_Unwind_Ptr pc;
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_Unwind_Ptr exidx_start;
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int exidx_len;
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};
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/* Callback to determins if the PC lies within an object, and remember the
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location of the exception index table if it does. */
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static int
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find_exidx_callback (struct dl_phdr_info * info, size_t size, void * ptr)
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{
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struct unw_eh_callback_data * data;
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const ElfW(Phdr) *phdr;
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int i;
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int match;
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_Unwind_Ptr load_base;
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data = (struct unw_eh_callback_data *) ptr;
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load_base = info->dlpi_addr;
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phdr = info->dlpi_phdr;
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match = 0;
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for (i = info->dlpi_phnum; i > 0; i--, phdr++)
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{
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if (phdr->p_type == PT_LOAD)
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{
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_Unwind_Ptr vaddr = phdr->p_vaddr + load_base;
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if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz)
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match = 1;
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}
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else if (phdr->p_type == PT_ARM_EXIDX)
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{
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data->exidx_start = (_Unwind_Ptr) (phdr->p_vaddr + load_base);
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data->exidx_len = phdr->p_memsz;
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}
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}
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return match;
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}
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/* Find the exception index table containing PC. */
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_Unwind_Ptr
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__gnu_Unwind_Find_exidx (_Unwind_Ptr pc, int * pcount)
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{
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struct unw_eh_callback_data data;
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data.pc = pc;
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data.exidx_start = 0;
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if (__dl_iterate_phdr (find_exidx_callback, &data) <= 0)
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return 0;
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*pcount = data.exidx_len / 8;
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return data.exidx_start;
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}
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