Mercurial > pub > dyncall > dyncall
annotate dyncallback/dyncall_callback_mips_eabi_gas.s @ 542:a73a5cd50c19
- fix passing aggregate-by-val on x64/sysv: subaggr classification for
aggr *arrays* was wrong (was problematic when there ware exactly 2 8bytes to
be classified, potentially be passed via registers)
| author | Tassilo Philipp |
|---|---|
| date | Mon, 02 May 2022 15:32:41 +0200 |
| parents | 9e4f1355a388 |
| children |
| rev | line source |
|---|---|
| 94 | 1 /* |
| 2 | |
| 3 Package: dyncall | |
| 4 Library: dyncallback | |
| 5 File: dyncallback/dyncall_callback_mips_eabi_gas.s | |
|
101
1ce60358fbad
- mips related cleanup, mostly comments, cpp macro lib
cslag
parents:
94
diff
changeset
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6 Description: Callback Thunk - Implementation for mips32 eabi |
| 94 | 7 License: |
| 8 | |
| 9 Copyright (c) 2016 Tassilo Philipp <tphilipp@potion-studios.com> | |
| 10 | |
| 11 Permission to use, copy, modify, and distribute this software for any | |
| 12 purpose with or without fee is hereby granted, provided that the above | |
| 13 copyright notice and this permission notice appear in all copies. | |
| 14 | |
| 15 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| 16 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 17 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
| 18 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
| 21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 */ | |
| 24 | |
| 156 | 25 /* input: |
| 26 $t4 -> thunk | |
| 27 $t4+20 -> cb handler | |
| 28 $t4+24 -> userdata | |
| 29 */ | |
| 110 | 30 |
| 156 | 31 .text |
| 32 .globl dcCallbackThunkEntry | |
| 33 .ent dcCallbackThunkEntry | |
| 110 | 34 |
| 35 /* Called by thunk - thunk stores pointer to DCCallback in $12 ($t4), and */ | |
| 36 /* pointer to called function in $25 ($t9, required for PIC) */ | |
| 94 | 37 dcCallbackThunkEntry: |
| 110 | 38 .set noreorder |
| 94 | 39 |
| 110 | 40 /* Prolog. */ |
| 41 /* Frame size of 88b comes from following: */ | |
| 42 /* DCargs(fregs:32 + iregs:32 + regcounts:4 + stackptr:4) + retval:8 + ra:4 (+ pad:4) */ | |
| 43 subu $sp, 88 /* open frame */ | |
| 44 sw $ra, 84($sp) /* save link register */ | |
| 45 | |
| 46 .frame $fp,88,$31 /* specify our frame: fp,size,lr; creates virt $fp */ | |
| 47 /* code below doesn't use $fp though, as n/a with -O1 */ | |
| 48 /* Init return value */ | |
| 49 sw $zero, 72($sp) | |
| 50 sw $zero, 76($sp) | |
| 51 | |
| 52 /* Store float and int args where our DCargs member arrays are, in local area. */ | |
| 53 sw $4, 0($sp) | |
| 54 sw $5, 4($sp) | |
| 55 sw $6, 8($sp) | |
| 56 sw $7, 12($sp) | |
| 57 sw $8, 16($sp) | |
| 58 sw $9, 20($sp) | |
| 59 sw $10, 24($sp) | |
| 60 sw $11, 28($sp) | |
| 61 s.s $f12, 32($sp) | |
| 62 s.s $f13, 36($sp) | |
| 63 s.s $f14, 40($sp) | |
| 64 s.s $f15, 44($sp) | |
| 65 s.s $f16, 48($sp) | |
| 66 s.s $f17, 52($sp) | |
| 67 s.s $f18, 56($sp) | |
| 68 s.s $f19, 60($sp) | |
| 69 | |
| 70 /* Init DCarg's reg_counts and stackptr. */ | |
| 71 sw $zero, 64($sp) /* reg_count */ | |
| 72 addiu $4, $sp, 88 | |
| 73 sw $4, 68($sp) /* stackptr */ | |
| 74 | |
| 75 /* Prepare callback handler call. */ | |
| 76 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */ | |
| 77 move $5, $sp /* Param 1 = DCArgs*, pointer to where pointer to args is stored */ | |
| 78 addiu $6, $sp, 72 /* Param 2 = results pointer to 8b of local data on stack */ | |
| 79 lw $7, 24($12) /* Param 3 = userdata pointer */ | |
| 80 | |
| 81 lw $25, 20($12) /* store handler entry in $25 ($t9), required for PIC */ | |
| 82 jalr $25 /* jump */ | |
| 83 nop /* branch delay nop */ | |
| 84 | |
| 85 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */ | |
| 86 lw $2, 72($sp) | |
| 87 lw $3, 76($sp) | |
| 88 l.d $f0, 72($sp) | |
| 89 | |
| 90 /* Epilog. Tear down frame and return. */ | |
| 91 lw $ra, 84($sp) /* restore return address */ | |
| 92 addiu $sp, $sp, 88 /* close frame */ | |
| 93 j $ra /* return */ | |
| 94 nop /* branch delay nop */ | |
| 95 | |
| 96 .set reorder | |
| 97 .end dcCallbackThunkEntry | |
| 98 .ident "handwritten" | |
| 99 |