Mercurial > pub > dyncall > dyncall
annotate dyncall/dyncall_call_arm32_thumb_armhf.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 | f5577f6bf97a |
| children | 7364f285cac8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dyncall | |
| 5 File: dyncall/dyncall_call_arm32_thumb_armhf.S | |
| 6 Description: Call Kernel for ARM 32-bit ARM Architecture - Hard Float in Thumb code | |
| 7 License: | |
| 8 | |
| 281 | 9 Copyright (c) 2007-2018 Daniel Adler <dadler@uni-goettingen.de>, |
| 0 | 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 | |
| 28 #include "../portasm/portasm-arm.S" | |
| 29 | |
| 30 /* ============================================================================ | |
| 31 DynCall Call Kernel for ARM 32-bit ARM Architecture Hard-Float | |
| 32 ---------------------------------------------------------------------------- | |
| 33 C Interface: | |
| 34 dcCall_arm32_armhf (DCpointer target, DCpointer argv, DCsize size, DCfloat* regdata); | |
| 35 | |
| 36 This Call Kernel was tested on Raspberry Pi/Raspbian (Debian) | |
| 37 */ | |
| 38 | |
| 39 .text | |
| 40 .thumb | |
| 41 #ifndef __thumb2__ | |
| 42 .code 16 | |
| 43 #endif | |
| 44 // .arch armv6 | |
| 45 // .fpu vfp | |
| 46 | |
| 36 | 47 /* |
| 48 1st arg / r0 = funptr | |
| 49 2st arg / r1 = ptr to int args | |
| 50 3st arg / r2 = size | |
| 51 4st arg / r3 = ptr to float args | |
| 52 */ | |
| 0 | 53 GLOBAL_C(dcCall_arm32_armhf) |
| 54 .thumb_func | |
| 55 ENTRY_C(dcCall_arm32_armhf) | |
| 56 | |
| 57 /* Prolog. This function never needs to spill inside its prolog, so just store the permanent registers. */ | |
| 58 | |
| 59 // mov r12 , r13 /* Stack ptr (r13) -> temporary (r12). */ | |
| 60 // stmdb r13!, {r4-r5, r11, r12, r14} /* Permanent registers and stack pointer (now in r12), etc... -> save area on stack (except counter). */ | |
| 61 | |
| 62 //mov r11 , r12 /* Set frame ptr. */ | |
| 63 | |
| 64 push {r4-r7, r14} | |
| 65 mov r7 , r13 | |
| 66 | |
| 67 mov r4 , r0 /* r4 = 'fptr' (1st argument is passed in r0). */ | |
| 68 mov r5 , r1 /* r5 = 'args' (2nd argument is passed in r1). */ | |
| 69 | |
| 70 /* Load 16 single-precision registers (= 8 double-precision registers). */ | |
| 36 | 71 fldmiad r3, {d0-d7} |
| 0 | 72 |
| 73 sub r2 , #16 | |
| 74 cmp r2, #0 | |
| 75 ble armhf_call | |
| 76 | |
| 77 | |
| 78 // sub r13, r13, r2 | |
| 79 // and r13, #-8 /* align 8-byte. */ | |
| 80 | |
| 81 mov r6, r13 | |
| 82 sub r6 , r2 | |
| 83 // mov r3 , #8 | |
| 84 // neg r3 , r3 | |
| 85 // and r6 , r3 | |
| 86 lsr r6 , #3 | |
| 87 lsl r6 , #3 | |
| 88 mov r13, r6 | |
| 89 | |
| 90 mov r3, #0 /* Init byte counter. */ | |
| 91 add r1 , #16 | |
| 92 armhf_pushArgs: | |
| 93 ldr r0, [r1, +r3] /* Load word into r0. */ | |
| 94 // str r0, [r13, +r3] /* Push word onto stack. */ | |
| 95 str r0, [r6, +r3] /* Push word onto stack. */ | |
| 96 add r3, #4 /* Increment byte counter. */ | |
| 97 cmp r2, r3 | |
| 98 bne armhf_pushArgs | |
| 99 | |
| 100 armhf_call: | |
| 101 ldmia r5!, {r0-r3} /* Load first 4 arguments for new call into r0-r3. */ | |
|
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:
281
diff
changeset
|
102 /* 'blx r4' workaround for ARMv4t: */ |
| 0 | 103 // mov r14, r15 /* Branch return address(r15) -> link register (r14) -- r15 always points to address of current + 2 instructions (= Epilog code). */ |
| 104 mov r6, r15 | |
| 105 add r6, #5 | |
| 106 mov r14, r6 | |
| 107 bx r4 /* Call (ARM/THUMB), available for ARMv4t. */ | |
| 108 | |
| 109 /* Epilog. */ | |
| 110 // ldmdb r11, {r4-r5, r11, r13, r15} /* Restore permanent registers (ignore temporary (r12), restore stack ptr and program counter).@@@db not needed since we rewrite r13? */ | |
| 111 mov r13, r7 | |
| 112 pop {r4-r7, r15} | |
| 113 |