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annotate dyncallback/dyncall_callback_mips_o32_gas.s @ 103:b15d814ba274

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- mostly functional mips o32 callbacks (seems to still have problems with 64bit params)
author cslag
date Wed, 08 Jun 2016 02:27:12 +0200
parents b7a9b524f0c3
children dbca6763f2be
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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_o32_gas.s
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6 Description: Callback Thunk - Implementation mips32 o32
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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
102
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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
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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 pointer to called function in $25 ($t9, required for PIC) */
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41 dcCallbackThunkEntry:
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42 .set noreorder
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43 .set nomacro
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44
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45 /* Prolog. Just store the minimum, return address, frame pointer, spill area. */
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46 subu $sp, 32 /* open frame: 32b for 8b aligned frame (retval+ra+fp+spill) */
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47 sw $ra, 20($sp) /* save link register */
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48
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49 .frame $fp,32,$31 /* specify our frame: fp,size,lr; creates virt $fp */
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50
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51 /* Init return value */
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52 sw $zero, 24($sp)
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53 sw $zero, 28($sp)
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54
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55 /* If we spill the first four, all arguments will be in one out in consecutive block */
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56 /* Caller doesn't and it's up to us to spill, so let's write $4-$7 ($a0-$a3) to the */
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57 /* dedicated spill area, first (at end of _caller's_ frame, so $fp points right to it). */
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58 sw $7, 12($fp)
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59 sw $6, 8($fp)
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60 sw $5, 4($fp)
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61 sw $4, 0($fp)
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62
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63 /* Init DCArg, which contains stackptr* to the args, which is $fp. Use padding between */
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64 /* stored return address and parameter area as place to store it (hacky, but saves 8b) */
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65 sw $fp, 16($sp)
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66
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67 /* Prepare callback handler call. */
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68 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */
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69 addiu $5, $sp, 16 /* Param 1 = DCArgs*, pointer to where pointer to args is stored */
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70 addiu $6, $sp, 24 /* Param 2 = results pointer to 8b of local data on stack */
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71 lw $7, 24($12) /* Param 3 = userdata pointer */
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72
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73 lw $25, 20($12) /* store handler entry in $25 ($t9), required for PIC */
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74 jalr $25 /* jump */
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75 nop
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76
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77 /* Copy result in corresponding registers $2-$3 ($v0-$v1) */
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78 lw $2, 24($sp)
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79 lw $3, 28($sp)
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80
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81 /* Epilog. Tear down frame and return. */
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82 lw $ra, 20($sp) /* restore return address */
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83 addiu $sp, $sp, 32 /* close frame */
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84 j $ra /* return */
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85 nop
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86
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87 .set macro
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88 .set reorder
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89 .end dcCallbackThunkEntry
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90 .ident "handwritten"
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91