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annotate dyncallback/dyncall_callback_mips_n64_gas.s @ 122:f63467916f98

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- first draft of mips64 n64 callbacks, not everything working, though
author cslag
date Mon, 04 Jul 2016 01:11:08 +0200
parents c5cb02203df4
children 6bd0974d257b
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1 /*
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2
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3 Package: dyncall
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4 Library: dyncallback
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5 File: dyncallback/dyncall_callback_mips_n64_gas.s
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6 Description: Callback Thunk - Implementation for mips64 n64
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7 License:
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8
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9 Copyright (c) 2016 Tassilo Philipp <tphilipp@potion-studios.com>
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10
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11 Permission to use, copy, modify, and distribute this software for any
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12 purpose with or without fee is hereby granted, provided that the above
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13 copyright notice and this permission notice appear in all copies.
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14
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15 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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16 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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17 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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18 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 @@@ NOT FULLY WORKING, YET
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24 */
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25
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26 /* input:
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27 $t8 -> thunk
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28 $t8+56 -> cb handler
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29 $t8+64 -> userdata
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30 */
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31
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32 .section .mdebug.abi64
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33 .previous
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34 .abicalls
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35 .text
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36 .align 2
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37 .globl dcCallbackThunkEntry
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38 .ent dcCallbackThunkEntry
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39 dcCallbackThunkEntry:
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40 .set noreorder
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41
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42 /* Prolog. */
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43 /* Frame size of 160b comes from following: */
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44 /* DCargs(fregs:64 + iregs:64 + regcounts:8 + stackptr:8) + retval:8 + ra:8 */
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45 subu $sp, 160 /* open frame */
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46 sd $ra, 152($sp) /* save link register */
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47
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48 .frame $fp,160,$31 /* specify our frame: fp,size,lr; creates virt $fp */
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49 /* code below doesn't use $fp though, as n/a with -O1 */
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50 /* Init return value */
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51 sd $zero, 144($sp)
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52
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53 /* Store float and int args where our DCargs member arrays are, in local area. */
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54 sd $4, 0($sp)
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55 sd $5, 8($sp)
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56 sd $6, 16($sp)
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57 sd $7, 24($sp)
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58 sd $8, 32($sp)
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59 sd $9, 40($sp)
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60 sd $10, 48($sp)
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61 sd $11, 56($sp)
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62 s.d $f12, 64($sp)
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63 s.d $f13, 72($sp)
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64 s.d $f14, 80($sp)
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65 s.d $f15, 88($sp)
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66 s.d $f16, 96($sp)
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67 s.d $f17, 104($sp)
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68 s.d $f18, 112($sp)
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69 s.d $f19, 120($sp)
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70
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71 /* Init DCarg's reg_counts and stackptr. */
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72 sd $zero, 128($sp) /* reg_count */
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73 addiu $4, $sp, 160
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74 sd $4, 136($sp) /* stackptr */
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75
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76 /* Prepare callback handler call. */
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77 move $4, $24 /* Param 0 = DCCallback*, $24 ($t8) holds pointer to thunk */
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78 move $5, $sp /* Param 1 = DCArgs*, pointer to where pointer to args is stored */
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79 addiu $6, $sp, 144 /* Param 2 = results pointer to 8b of local data on stack */
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80 ld $7, 64($24) /* Param 3 = userdata pointer */
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81
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82 ld $25, 56($24) /* store handler entry in $25 ($t9), required for PIC */
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83 jalr $25 /* jump */
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84 nop /* branch delay nop */
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85
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86 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */
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87 ld $2, 144($sp)
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88 /*ld $3, 152($sp) @@@ ignoring second possible retval for now*/
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89 l.d $f0, 144($sp)
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90
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91 /* Epilog. Tear down frame and return. */
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92 ld $ra, 152($sp) /* restore return address */
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93 addiu $sp, $sp, 160 /* close frame */
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94 j $ra /* return */
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95 nop /* branch delay nop */
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96
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97 .set reorder
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98 .end dcCallbackThunkEntry
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99 .ident "handwritten"
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100