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annotate dyncallback/dyncall_callback_mips_n64.S @ 302:d55f9d508074

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- mips softfloat support for o32 callconv (calls and callbacks, little and big endian) - cleanup of some mips files, removed unnecessary file, renamings.. - doc/manual cleanups, changelog entry
author Tassilo Philipp
date Mon, 21 May 2018 02:48:12 +0200
parents dyncallback/dyncall_callback_mips_n64_gas.s@1b0c02e827c4
children b104c5beec8b
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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 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 .section .mdebug.abi64
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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
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36 .globl dcCallbackThunkEntry
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37 .ent dcCallbackThunkEntry
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38 dcCallbackThunkEntry:
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39 .set noreorder
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40
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41 /* Prolog. */
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42 /* Frame size of 160b comes from following: */
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43 /* DCargs(fregs:64 + iregs:64 + regcounts:8 + stackptr:8) + retval:8 + ra:8 */
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44 daddiu $sp, $sp, -160 /* open frame */
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45 sd $ra, 152($sp) /* save link register */
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46
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47 .frame $fp,160,$31 /* specify our frame: fp,size,lr; creates virt $fp */
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48 /* code below doesn't use $fp though, as n/a with -O1 */
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49 /* Init return value */
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50 sd $zero, 144($sp)
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51
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52 /* Store float and int args where our DCargs member arrays are, in local area. */
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53 sd $4, 0($sp)
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54 sd $5, 8($sp)
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55 sd $6, 16($sp)
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56 sd $7, 24($sp)
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57 sd $8, 32($sp)
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58 sd $9, 40($sp)
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59 sd $10, 48($sp)
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60 sd $11, 56($sp)
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61 s.d $f12, 64($sp)
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62 s.d $f13, 72($sp)
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63 s.d $f14, 80($sp)
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64 s.d $f15, 88($sp)
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65 s.d $f16, 96($sp)
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66 s.d $f17, 104($sp)
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67 s.d $f18, 112($sp)
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68 s.d $f19, 120($sp)
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69
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70 /* Init DCarg's reg_counts and stackptr. */
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71 sd $zero, 128($sp) /* reg_count */
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72 daddiu $4, $sp, 160
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73 sd $4, 136($sp) /* stackptr */
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75 /* Prepare callback handler call. */
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76 move $4, $24 /* Param 0 = DCCallback*, $24 ($t8) holds pointer to thunk */
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77 move $5, $sp /* Param 1 = DCArgs*, pointer to where pointer to args is stored */
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78 daddiu $6, $sp, 144 /* Param 2 = results pointer to 8b of local data on stack */
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79 ld $7, 64($24) /* Param 3 = userdata pointer */
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80
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81 ld $25, 56($24) /* store handler entry in $25 ($t9), required for PIC */
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82 jalr $25 /* jump */
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83 nop /* branch delay nop */
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84
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85 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */
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86 ld $2, 144($sp) /* note: ignoring second possible retval in $3, here */
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87 l.d $f0, 144($sp)
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88
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89 /* Epilog. Tear down frame and return. */
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90 ld $ra, 152($sp) /* restore return address */
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91 daddiu $sp, $sp, 160 /* close frame */
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92 j $ra /* return */
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93 nop /* branch delay nop */
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95 .set reorder
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96 .end dcCallbackThunkEntry
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97 .ident "handwritten"
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98