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annotate dyncallback/dyncall_callback_mips_o32_gas.s @ 256:7520e2260097

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- added to configure some detection on how to compile .s/.S with --noexecstack (or similar), as compilers' defaults are often insane - since no-execstack handling is now in build, remove .note.GNU-stack section markers (were of limites use, anyways, b/c unportable or implemented inconsistently across platforms) - some ToDo, etc. updates
author Tassilo Philipp
date Sat, 20 May 2017 00:02:59 +0200
parents 9e677d4c0b6b
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_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 */
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41 /* pointer to called function in $25 ($t9, required for PIC) */
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42 dcCallbackThunkEntry:
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43 .set noreorder
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45 /* Prolog. Just store the minimum, return address, spill area. */
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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 s.d $f12, 40($sp) /* -16($fp) */
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64 s.d $f14, 48($sp) /* -8($fp) */
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65 sw $4, 56($sp) /* 0($fp) */
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66 sw $5, 60($sp) /* 4($fp) */
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67 sw $6, 64($sp) /* 8($fp) */
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68 sw $7, 68($sp) /* 12($fp) */
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70 /* Init DCArg, which contains reg_count and stackptr* to the args. Point */
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71 /* stackptr to the area where the non-float args start (which is at $fp). */
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72 addiu $4, $sp, 56 /* non-$fp replacement for: */
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73 sw $4, 28($sp) /* sw $fp, 28($sp) */
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74 sw $zero, 24($sp)
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75
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76 /* Prepare callback handler call. */
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77 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */
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78 addiu $5, $sp, 24 /* Param 1 = DCArgs*, pointer to where pointer to args is stored */
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79 addiu $6, $sp, 32 /* Param 2 = results pointer to 8b of local data on stack */
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80 lw $7, 24($12) /* Param 3 = userdata pointer */
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81
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82 lw $25, 20($12) /* 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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86 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */
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87 lw $2, 32($sp)
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88 lw $3, 36($sp)
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89 l.d $f0, 32($sp)
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90
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91 /* Epilog. Tear down frame and return. */
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92 lw $ra, 20($sp) /* restore return address */
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93 addiu $sp, $sp, 56 /* 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