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add some ARM EABI-specific exception handling infrastructure

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patch by Timo Teräs
This commit is contained in:
Rich Felker 2013-07-10 16:11:01 -04:00
commit 3e8806b4f7
1 changed files with 42 additions and 0 deletions
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42
arch/arm/src/find_exidx.c Normal file
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#define _GNU_SOURCE
#include <link.h>
#include <stdint.h>
struct find_exidx_data {
uintptr_t pc, exidx_start;
int exidx_len;
};
static int find_exidx(struct dl_phdr_info *info, size_t size, void *ptr)
{
struct find_exidx_data *data = ptr;
const ElfW(Phdr) *phdr = info->dlpi_phdr;
uintptr_t addr, exidx_start = 0;
int i, match = 0, exidx_len = 0;
for (i = info->dlpi_phnum; i > 0; i--, phdr++) {
addr = info->dlpi_addr + phdr->p_vaddr;
switch (phdr->p_type) {
case PT_LOAD:
match |= data->pc >= addr && data->pc < addr + phdr->p_memsz;
break;
case PT_ARM_EXIDX:
exidx_start = addr;
exidx_len = phdr->p_memsz;
break;
}
}
data->exidx_start = exidx_start;
data->exidx_len = exidx_len;
return match;
}
uintptr_t __gnu_Unwind_Find_exidx(uintptr_t pc, int *pcount)
{
struct find_exidx_data data;
data.pc = pc;
if (dl_iterate_phdr(find_exidx, &data) <= 0)
return 0;
*pcount = data.exidx_len / 8;
return data.exidx_start;
}