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annotate dyncallback/dyncall_callback_mips_n64.S @ 305:b104c5beec8b

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- softfloat support for mips64/n64 abi
author Tassilo Philipp
date Wed, 23 May 2018 11:41:34 +0200
parents d55f9d508074
children
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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.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) 2016-2018 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 */
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24
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25 /* input:
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26 $t8 -> thunk
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27 $t8+56 -> cb handler
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28 $t8+64 -> userdata
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29 */
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30
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31 /* Frame size is 160b for hard- and 128b for soft-float, as follows: */
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32 /* DCargs(fregs:64? + iregs:64 + regcnts:8 + sp:8) + rval:8 + ra:8 */
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33 #if defined(DC__ABI_HARDFLOAT)
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34 SP_SP = 160
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35 #else
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36 SP_SP = 96
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37 #endif
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38 SP_LR = SP_SP-8
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39 SP_RVAL = SP_SP-16
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40 SP_ARG_SP = SP_SP-24
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41 SP_ARG_RC = SP_SP-32
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42
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43 .section .mdebug.abi64
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44 .previous
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45 .abicalls
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46 .text
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47 .align 2
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48 .globl dcCallbackThunkEntry
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49 .ent dcCallbackThunkEntry
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50 dcCallbackThunkEntry:
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51 .set noreorder
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52
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53 /* Prolog. */
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54 daddiu $sp, $sp, -SP_SP /* open frame */
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55 sd $ra, SP_LR($sp) /* save link register */
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56
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57 .frame $fp,SP_SP,$31 /* specify our frame: fp,size,lr; creates virt $fp */
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58 /* code below doesn't use $fp though, as n/a with -O1 */
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59 /* Init return value */
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60 sd $zero, SP_RVAL($sp)
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61
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62 /* Store reg args where our DCargs member arrays are, in local stack area */
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63 sd $4, 0($sp)
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64 sd $5, 8($sp)
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65 sd $6, 16($sp)
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66 sd $7, 24($sp)
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67 sd $8, 32($sp)
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68 sd $9, 40($sp)
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69 sd $10, 48($sp)
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70 sd $11, 56($sp)
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71 #if defined(DC__ABI_HARDFLOAT)
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72 s.d $f12, 64($sp)
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73 s.d $f13, 72($sp)
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74 s.d $f14, 80($sp)
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75 s.d $f15, 88($sp)
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76 s.d $f16, 96($sp)
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77 s.d $f17, 104($sp)
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78 s.d $f18, 112($sp)
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79 s.d $f19, 120($sp)
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80 #endif
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81
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82 /* Init DCarg's reg_counts and stackptr. */
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83 sd $zero, SP_ARG_RC($sp) /* reg_count */
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84 daddiu $4, $sp, SP_SP
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85 sd $4, SP_ARG_SP($sp) /* stackptr */
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86
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87 /* Prepare callback handler call. */
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88 move $4, $24 /* Param 0 = DCCallback*, $24/$t8 holds DCThunk* */
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89 move $5, $sp /* Param 1 = ptr to where DCArgs* is stored */
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90 daddiu $6, $sp, SP_RVAL /* Param 2 = results ptr to 8b of local stack data */
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91 ld $7, 64($24) /* Param 3 = userdata pointer */
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92
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93 ld $25, 56($24) /* store handler entry in $25/$t9, required for PIC */
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94 jalr $25 /* jump */
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95 nop /* branch delay nop */
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96
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97 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */
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98 ld $2, SP_RVAL($sp) /* note: ignoring 2nd possible retval in $3, here */
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99 #if defined(DC__ABI_HARDFLOAT)
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100 l.d $f0, SP_RVAL($sp)
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101 #endif
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102
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103 /* Epilog. Tear down frame and return. */
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104 ld $ra, SP_LR($sp) /* restore return address */
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105 daddiu $sp, $sp, SP_SP /* close frame */
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106 j $ra /* return */
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107 nop /* branch delay nop */
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108
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109 .set reorder
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110 .end dcCallbackThunkEntry
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111 .ident "handwritten"
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112