0
|
1 /*
|
|
2
|
|
3 Package: dyncall
|
|
4 Library: dyncallback
|
143
|
5 File: dyncallback/dyncall_thunk_arm32.c
|
|
6 Description: Thunk - Implementation for ARM32 (ARM and THUMB mode)
|
0
|
7 License:
|
|
8
|
281
|
9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>,
|
0
|
10 Tassilo Philipp <tphilipp@potion-studios.com>
|
|
11
|
|
12 Permission to use, copy, modify, and distribute this software for any
|
|
13 purpose with or without fee is hereby granted, provided that the above
|
|
14 copyright notice and this permission notice appear in all copies.
|
|
15
|
|
16 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
17 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
18 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
19 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
23
|
|
24 */
|
|
25
|
|
26
|
143
|
27 /* Since we can mix ARM and THUMB assembly, this works for both modes */
|
|
28
|
0
|
29 #include "dyncall_thunk.h"
|
|
30
|
|
31 void dcbInitThunk(DCThunk* p, void (*entry)())
|
|
32 {
|
|
33 /*
|
|
34 # ARM32 (ARM mode) thunk code:
|
|
35 .code 32
|
|
36 sub %r12, %r15, #8
|
|
37 ldr %r15, [%r15, #-4]
|
|
38 */
|
|
39
|
38
|
40 /* This code stores a ptr to DCCallback in r12 (equals ptr to thunk, */
|
|
41 /* which is PC (r15) minus 8, as PC points to current instruction+8. */
|
|
42 /* Then it loads the callback 'entry' into PC. The -4 is needed, also bc */
|
|
43 /* of the PC pointing ahead. */
|
0
|
44 p->code[0] = 0xe24fc008UL; /* sub %r12, %r15, #8 */
|
|
45 p->code[1] = 0xe51ff004UL; /* ldr %r15, [%r15, #-4] */
|
38
|
46 p->entry = entry;
|
0
|
47 }
|