Mercurial > pub > dyncall > dyncall
comparison dyncallback/dyncall_thunk_arm32.c @ 143:170cde9e2a83
- arm arm/thumb cleanup, sharing more files, directly
author | cslag |
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date | Sat, 20 Aug 2016 11:39:54 +0200 |
parents | dyncallback/dyncall_thunk_arm32_arm.c@fb416abb2059 |
children | f5577f6bf97a |
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142:8d6825e3f064 | 143:170cde9e2a83 |
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1 /* | |
2 | |
3 Package: dyncall | |
4 Library: dyncallback | |
5 File: dyncallback/dyncall_thunk_arm32.c | |
6 Description: Thunk - Implementation for ARM32 (ARM and THUMB mode) | |
7 License: | |
8 | |
9 Copyright (c) 2007-2015 Daniel Adler <dadler@uni-goettingen.de>, | |
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 | |
27 /* Since we can mix ARM and THUMB assembly, this works for both modes */ | |
28 | |
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 | |
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. */ | |
44 p->code[0] = 0xe24fc008UL; /* sub %r12, %r15, #8 */ | |
45 p->code[1] = 0xe51ff004UL; /* ldr %r15, [%r15, #-4] */ | |
46 p->entry = entry; | |
47 } |