|
0
|
1 /*
|
|
|
2
|
|
|
3 Package: dyncall
|
|
|
4 Library: dyncall
|
|
|
5 File: dyncall/dyncall_call_arm32_thumb_apple.s
|
|
|
6 Description: ARM Thumb call kernel implementation for apple assembler.
|
|
|
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
|
|
|
27 .text
|
|
|
28 .thumb
|
|
|
29 .code 16
|
|
|
30 .globl _dcCall_arm32_thumb
|
|
|
31
|
|
|
32 /* Main dyncall call. */
|
|
|
33 .thumb_func
|
|
|
34 _dcCall_arm32_thumb:
|
|
|
35
|
|
|
36 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */
|
|
|
37 push {r4-r7, r14} /* Frame ptr, permanent registers, link register -> save area on stack. */
|
|
|
38 mov r7, r13 /* Set frame ptr. */
|
|
|
39
|
|
|
40 /* Call. */
|
|
|
41 mov r4, r0 /* Move 'fptr' to r4 (1st argument is passed in r0). */
|
|
|
42
|
|
|
43 /* Disable 'thumb' address forcing... */
|
|
|
44
|
|
|
45 /* mov r0, #1 */ /* Assure that LSB is set to 1 (THUMB call). - Not Required and not useful for interworking calls */
|
|
|
46 /* orr r4, r0 */
|
|
|
47
|
|
|
48 mov r5, r1 /* Move 'args' to r5 (2nd argument is passed in r1). */
|
|
|
49 mov r6, r2 /* Move 'size' to r6 (3rd argument is passed in r2). */
|
|
|
50
|
|
|
51 cmp r6, #16 /* Jump to call if no more than 4 arguments. */
|
|
|
52 ble call
|
|
|
53
|
|
|
54 sub r6, #16 /* Size of remaining arguments. */
|
|
|
55 mov r0, r13 /* Set stack pointer to top of stack. */
|
|
|
56 sub r0, r0, r6
|
|
|
57 lsr r0, #3 /* Align stack on 8 byte boundaries. */
|
|
|
58 lsl r0, #3
|
|
|
59 mov r13, r0
|
|
|
60
|
|
|
61 add r1, #16 /* Let r1 point to remaining arguments. */
|
|
|
62 mov r2, #0 /* Init byte counter to 0. */
|
|
|
63 .thumb_func
|
|
|
64 pushArgs:
|
|
|
65 ldrb r3, [r1, r2] /* Load a byte into r3. */
|
|
|
66 strb r3, [r0, r2] /* Push byte onto stack. */
|
|
|
67 add r2, r2, #1 /* Increment byte counter. */
|
|
|
68 cmp r2, r6
|
|
|
69 bne pushArgs
|
|
|
70 .thumb_func
|
|
|
71 call:
|
|
|
72 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */
|
|
|
73
|
|
|
74 /* 'blx %r4' workaround for ARMv4t in THUMB: */
|
|
|
75 blx r4 /* Branch and force THUMB-mode return (LR bit 0 set). */
|
|
|
76
|
|
|
77 /* Epilog. */
|
|
|
78 mov r13, r7 /* Reset stack ptr. */
|
|
|
79 pop {r4-r7, r15} /* Restore permanent registers and program counter. (Force a stay in THUMB in ARMv4, whether ARMv5 can return in ARM or THUMB depending on the bit 0. */
|
|
|
80
|
