Mercurial > pub > dyncall > dyncall
annotate dyncallback/dyncall_callback_arm32_arm_gas.S @ 226:6e40eb9fb261
- different strategy for mach-o files to lookup symbol names, in order to be consistent with other functions (that use dladdr() and dlsym() calls, which mostly don't use '_' prefixes)
author | Tassilo Philipp |
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date | Sat, 15 Apr 2017 22:02:58 +0200 |
parents | 9bd3c5219505 |
children | 91db39538e78 |
rev | line source |
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0 | 1 /* |
2 | |
3 Package: dyncall | |
4 Library: dyncallback | |
38 | 5 File: dyncallback/dyncall_callback_arm32_arm_gas.S |
0 | 6 Description: Callback Thunk - Implementation for ARM32 (ARM mode) |
7 License: | |
8 | |
9 Copyright (c) 2007-2011 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 | |
38 | 26 #include "../dyncall/dyncall_macros.h" |
0 | 27 |
28 .text | |
29 .code 32 /* ARM mode */ | |
30 | |
31 .globl dcCallbackThunkEntry | |
32 | |
33 /* sizes */ | |
38 | 34 /* .set DCThunk_size , 8 */ |
35 /* .set DCArgs_size , 24 */ /* for EABI/ATPCS/... */ | |
50 | 36 /* .set DCArgs_size , 96 */ /* for armhf */ |
38 | 37 /* .set DCCallback_size, 20 */ |
0 | 38 .set DCValue_size , 8 |
39 | |
40 /* struct DCCallback offsets and size */ | |
38 | 41 /* .set CTX_thunk , 0 */ |
0 | 42 .set CTX_handler , 12 |
43 .set CTX_userdata , 16 | |
44 | |
45 | |
46 /* Called by thunk - thunk stores pointer to DCCallback in r12 */ | |
47 dcCallbackThunkEntry: | |
48 | |
49 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ | |
50 stmdb %r13, {%r4-%r11, %r13, %r14} /* Permanent registers and stack pointer, etc... -> save area on stack (except counter). */ | |
51 mov %r11, %r13 /* Set frame pointer. */ | |
52 sub %r13, %r13, #40 /* Adjust stack pointer. */ | |
53 | |
54 /* Grab arguments. */ | |
55 mov %r4, #0 | |
38 | 56 #if defined(DC__ABI_ARM_HF) |
57 stmdb %r13!, {%r4} /* Init freg_count and dreg_count to 0 */ | |
58 stmdb %r13!, {%r4} | |
59 fstmdbd %r13!, {d0-d7} /* Store all fp-registers in DCArgs' f[16] */ | |
60 #endif | |
61 stmdb %r13!, {%r0-%r4, %r11} /* Spill first 4 args to DCArgs, along with reg_count (init to 0) and (stack) pointer to remaining args. */ | |
0 | 62 |
63 /* Prepare callback handler call. */ | |
64 mov %r0, %r12 /* Parameter 0 (r0) = DCCallback pointer (r12, pointer to thunk). */ | |
65 mov %r1, %r13 /* Parameter 1 (r1) = DCArgs pointer (r13, stack pointer). */ | |
66 sub %r13, %r13, #DCValue_size /* Make room for return value. */ | |
67 mov %r2, %r13 /* Parameter 2 (r2) = results pointer. */ | |
68 ldr %r3, [%r12, #CTX_userdata] /* Parameter 3 (r3) = userdata pointer. */ | |
69 | |
70 /* Call. */ | |
71 ldr %r4, [%r12, #CTX_handler] /* Load callback handler pointer into r4. */ | |
38 | 72 mov %r14, %r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */ |
0 | 73 bx %r4 /* Call. */ |
74 | |
75 /* Return value. */ | |
76 ldmia %r13, {%r0, %r1} /* Load return value in r0 and r1. */ | |
42
ecc9403e214a
- final touch for complete armhf callback support, yay
cslag
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77 #if defined(DC__ABI_ARM_HF) |
ecc9403e214a
- final touch for complete armhf callback support, yay
cslag
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78 fldmiad %r13, {%d0} /* Same for floating point return value (if any). */ |
ecc9403e214a
- final touch for complete armhf callback support, yay
cslag
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79 #endif |
0 | 80 |
81 /* Epilog. */ | |
82 ldmdb %r11, {%r4-%r11, %r13, %r15} /* Restore permanent registers (restore stack ptr and program counter).@@@db not needed since we rewrite r13? */ | |
83 |