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/* Copyright (C) 2005-2021 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
<https://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;
}
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