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comparison dyncallback/dyncall_thunk_arm32.c @ 412:beb15f1065e6

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- comments cleanup
author Tassilo Philipp
date Thu, 07 Oct 2021 09:31:54 +0200
parents f5577f6bf97a
children
comparison
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411:49bc10c99462 412:beb15f1065e6
4 Library: dyncallback 4 Library: dyncallback
5 File: dyncallback/dyncall_thunk_arm32.c 5 File: dyncallback/dyncall_thunk_arm32.c
6 Description: Thunk - Implementation for ARM32 (ARM and THUMB mode) 6 Description: Thunk - Implementation for ARM32 (ARM and THUMB mode)
7 License: 7 License:
8 8
9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>, 9 Copyright (c) 2007-2021 Daniel Adler <dadler@uni-goettingen.de>,
10 Tassilo Philipp <tphilipp@potion-studios.com> 10 Tassilo Philipp <tphilipp@potion-studios.com>
11 11
12 Permission to use, copy, modify, and distribute this software for any 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 13 purpose with or without fee is hereby granted, provided that the above
14 copyright notice and this permission notice appear in all copies. 14 copyright notice and this permission notice appear in all copies.
31 void dcbInitThunk(DCThunk* p, void (*entry)()) 31 void dcbInitThunk(DCThunk* p, void (*entry)())
32 { 32 {
33 /* 33 /*
34 # ARM32 (ARM mode) thunk code: 34 # ARM32 (ARM mode) thunk code:
35 .code 32 35 .code 32
36 sub %r12, %r15, #8 36 sub r12, r15, #8
37 ldr %r15, [%r15, #-4] 37 ldr r15, [r15, #-4]
38 */ 38 */
39 39
40 /* This code stores a ptr to DCCallback in r12 (equals ptr to thunk, */ 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. */ 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 */ 42 /* Then it loads the callback 'entry' into PC. The -4 is needed, also bc */
43 /* of the PC pointing ahead. */ 43 /* of the PC pointing ahead. */
44 p->code[0] = 0xe24fc008UL; /* sub %r12, %r15, #8 */ 44 p->code[0] = 0xe24fc008UL; /* sub r12, r15, #8 */
45 p->code[1] = 0xe51ff004UL; /* ldr %r15, [%r15, #-4] */ 45 p->code[1] = 0xe51ff004UL; /* ldr r15, [r15, #-4] */
46 p->entry = entry; 46 p->entry = entry;
47 } 47 }