Mercurial > pub > dyncall > dyncall
annotate dyncall/dyncall_call_arm32_thumb_apple.s @ 406:351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
| author | Tassilo Philipp |
|---|---|
| date | Sun, 03 Oct 2021 10:34:56 +0200 |
| parents | 3e629dc19168 |
| children |
| rev | line source |
|---|---|
| 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 | |
|
406
351bb41d3bb1
- removed %-prefixes for register names from arm assembly files (was wrong to begin with, gas accepted them but the clang integrated assembler does not)
Tassilo Philipp
parents:
0
diff
changeset
|
74 /* 'blx r4' workaround for ARMv4t in THUMB: */ |
| 0 | 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 |