Mercurial > pub > dyncall > dyncall

comparison dyncallback/dyncall_callback_arm32_arm_gas.S @ 38:fb416abb2059

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
- armhf callback support (not all working, yet)
author cslag
date Fri, 18 Dec 2015 19:07:17 +0100
parents dyncallback/dyncall_callback_arm32_arm_gas.s@3e629dc19168
children ecc9403e214a
comparison
equal deleted inserted replaced
37:020ef1972d31 38:fb416abb2059
1 /*
2
3 Package: dyncall
4 Library: dyncallback
5 File: dyncallback/dyncall_callback_arm32_arm_gas.S
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
26 #include "../dyncall/dyncall_macros.h"
27
28 .text
29 .code 32 /* ARM mode */
30
31 .globl dcCallbackThunkEntry
32
33 /* sizes */
34 /* .set DCThunk_size , 8 */
35 /* .set DCArgs_size , 24 */ /* for EABI/ATPCS/... */
36 /* .set DCArgs_size , 76 */ /* for armhf */
37 /* .set DCCallback_size, 20 */
38 .set DCValue_size , 8
39
40 /* struct DCCallback offsets and size */
41 /* .set CTX_thunk , 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
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. */
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. */
72 mov %r14, %r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */
73 bx %r4 /* Call. */
74
75 /* Return value. */
76 ldmia %r13, {%r0, %r1} /* Load return value in r0 and r1. */
77
78 /* Epilog. */
79 ldmdb %r11, {%r4-%r11, %r13, %r15} /* Restore permanent registers (restore stack ptr and program counter).@@@db not needed since we rewrite r13? */
80