blob: 0f88e2a7f75b1fc238cbf809d022a146b9003617 (
plain) (
blame)
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
47
48
49
50
51
52
|
/***************************************************************************
* ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
* Updated, adapted and several bug fixes on 2018 by Eduardo José Tagle
*
* This program is PUBLIC DOMAIN.
* This means that there is no copyright and anyone is able to take a copy
* for free and use it as they wish, with or without modifications, and in
* any context, commercially or otherwise. The only limitation is that I
* don't guarantee that the software is fit for any purpose or accept any
* liability for its use or misuse - this software is without warranty.
***************************************************************************
* File Description: Implementation of the interface into the ARM unwinder.
**************************************************************************/
#if defined(__arm__) || defined(__thumb__)
#define MODULE_NAME "UNWINDER"
#include <stdio.h>
#include <string.h>
#include "unwinder.h"
#include "unwarm.h"
#include "unwarmbytab.h"
/* These symbols point to the unwind index and should be provide by the linker script */
extern "C" const UnwTabEntry __exidx_start[];
extern "C" const UnwTabEntry __exidx_end[];
// Detect if unwind information is present or not
static int HasUnwindTableInfo() {
// > 16 because there are default entries we can't supress
return ((char*)(&__exidx_end) - (char*)(&__exidx_start)) > 16 ? 1 : 0;
}
UnwResult UnwindStart(UnwindFrame* frame, const UnwindCallbacks *cb, void *data) {
if (HasUnwindTableInfo()) {
/* We have unwind information tables */
return UnwindByTableStart(frame, cb, data);
}
else {
/* We don't have unwind information tables */
UnwState state;
/* Initialize the unwinding state */
UnwInitState(&state, cb, data, frame->pc, frame->sp);
/* Check the Thumb bit */
return (frame->pc & 0x1) ? UnwStartThumb(&state) : UnwStartArm(&state);
}
}
#endif
|
