Mercurial > pub > dyncall > dyncall
annotate dyncallback/dyncall_callback_mips_eabi_gas.s @ 149:c12120a1fbc0
- make cmake based builds work on systems without a C++ compiler (thanks Franklin Mathieu)
author | cslag |
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date | Sat, 17 Sep 2016 14:10:53 +0200 |
parents | 9aa75a74614c |
children | 9e4f1355a388 |
rev | line source |
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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 | |
110 | 25 /* input: |
26 $t4 -> thunk | |
27 $t4+20 -> cb handler | |
28 $t4+24 -> userdata | |
29 */ | |
30 | |
31 .text | |
32 .globl dcCallbackThunkEntry | |
33 .ent dcCallbackThunkEntry | |
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 |