1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
| | #define _GNU_SOURCE
#include <link.h>
#include <stdint.h>
typedef uintptr_t _Unwind_Ptr;
struct find_exidx_data {
_Unwind_Ptr 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;
_Unwind_Ptr 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;
}
}
if (match) {
data->exidx_start = exidx_start;
data->exidx_len = exidx_len;
}
return match;
}
_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr 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;
}
|