Mercurial > pub > dyncall > dyncall
annotate dyncallback/dyncall_callback_mips_o32.S @ 330:4e6f63b7020e
- stack layout typo for sparc doc
author | Tassilo Philipp |
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date | Fri, 22 Nov 2019 23:28:17 +0100 |
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rev | line source |
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94 | 1 /* |
2 | |
3 Package: dyncall | |
4 Library: dyncallback | |
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5 File: dyncallback/dyncall_callback_mips_o32.S |
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6 Description: Callback Thunk - Implementation mips32 o32 |
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 | |
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25 /* input: |
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26 $t4 -> thunk |
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27 $t4+20 -> cb handler |
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28 $t4+24 -> userdata |
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29 */ |
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30 |
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31 .section .mdebug.abi32 |
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32 .previous |
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33 .abicalls |
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34 .text |
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35 .align 2 |
94 | 36 .globl dcCallbackThunkEntry |
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37 .ent dcCallbackThunkEntry |
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38 .type dcCallbackThunkEntry, @function |
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39 |
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40 /* Called by thunk - thunk stores pointer to DCCallback in $12 ($t4), and */ |
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41 /* pointer to called function in $25 ($t9, required for PIC) */ |
94 | 42 dcCallbackThunkEntry: |
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43 .set noreorder |
94 | 44 |
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45 /* Prolog. Just store the minimum, return address, spill area. */ |
109 | 46 /* Frame size of 56b comes from following areas (each 8b aligned): */ |
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47 /* local: fpregs:16 + retval:8 + DCArgs:8 */ |
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48 /* save: ra:4 (+ pad:4) */ |
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49 /* param: spill:16 */ |
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50 subu $sp, 56 /* open frame */ |
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51 sw $ra, 20($sp) /* save link register */ |
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52 |
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53 .frame $fp,56,$31 /* specify our frame: fp,size,lr; creates virt $fp */ |
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54 /* code below doesn't use $fp though, as n/a with -O1 */ |
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55 /* Init return value */ |
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56 sw $zero, 32($sp) |
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57 sw $zero, 36($sp) |
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58 |
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59 /* Store the arguments passed via registers somewhere for dcArg* to access. */ |
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60 /* For $4-$7 ($a0-$a3), use dedicated spill area (caller doesn't spill, but */ |
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61 /* provides it at end of _caller's_ frame, so $fp points right to it). */ |
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62 /* For $f12 and $f14 use our space (in local data), which is adjacent. */ |
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63 #if defined(DC__ABI_HARDFLOAT) |
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64 s.d $f12, 40($sp) /* -16($fp) */ |
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65 s.d $f14, 48($sp) /* -8($fp) */ |
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66 #endif /* DC__ABI_HARDFLOAT */ |
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67 sw $4, 56($sp) /* 0($fp) */ |
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68 sw $5, 60($sp) /* 4($fp) */ |
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69 sw $6, 64($sp) /* 8($fp) */ |
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70 sw $7, 68($sp) /* 12($fp) */ |
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71 |
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72 /* Init DCArg, which contains reg_count and stackptr* to the args. Point */ |
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73 /* stackptr to the area where the non-float args start (which is at $fp). */ |
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74 addiu $4, $sp, 56 /* <- non-$fp replacement for: */ |
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75 sw $4, 28($sp) /* <- sw $fp, 28($sp) */ |
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76 #if defined(DC__ABI_HARDFLOAT) |
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77 sw $zero, 24($sp) /* init num float-regs (unused for soft-float) */ |
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78 #endif /* DC__ABI_HARDFLOAT */ |
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79 |
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80 /* Prepare callback handler call. */ |
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81 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */ |
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82 addiu $5, $sp, 24 /* Param 1 = DCArgs*, pointer to where pointer to args is stored */ |
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83 addiu $6, $sp, 32 /* Param 2 = results pointer to 8b of local data on stack */ |
103
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84 lw $7, 24($12) /* Param 3 = userdata pointer */ |
102
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85 |
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86 lw $25, 20($12) /* store handler entry in $25 ($t9), required for PIC */ |
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87 jalr $25 /* jump */ |
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88 nop /* branch delay nop */ |
102
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89 |
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90 /* Copy result to corresponding registers */ |
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91 /* Handle single precision soft-float retvals differently on big-endian */ |
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92 /* targets as they are right-justified in their 8b stack lots */ |
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93 #if !defined(DC__ABI_HARDFLOAT) && defined(DC__Endian_BIG) |
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94 xori $4, $2, 'f' /* $4 = 0 if cb-handler returned 'f' in $2 */ |
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95 #endif |
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96 lw $2, 32($sp) |
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97 lw $3, 36($sp) |
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98 #if defined(DC__ABI_HARDFLOAT) |
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99 l.d $f0, 32($sp) |
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100 #elif defined(DC__Endian_BIG) |
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101 bgtz $4, .nonf32r /* if no 'f' returned, $2 and $3 are good */ |
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102 nop /* branch delay nop */ |
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103 move $2, $3 |
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104 .nonf32r: |
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105 #endif /* DC__ABI_HARDFLOAT */ |
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106 |
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107 /* Epilog. Tear down frame and return. */ |
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108 lw $ra, 20($sp) /* restore return address */ |
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109 addiu $sp, $sp, 56 /* close frame */ |
102
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110 j $ra /* return */ |
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111 nop /* branch delay nop */ |
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112 |
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113 .set reorder |
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114 .end dcCallbackThunkEntry |
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115 .ident "handwritten" |
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116 |