Mercurial > pub > dyncall > dyncall
comparison dyncallback/dyncall_callback_mips_o32_gas.s @ 104:dbca6763f2be
- complete, working mips o32 callback (using hardware fp); fixes error from last commit, which ignored first 2 float args
* currently tested on little endian, only
* todo update, manual update, cleanups
| author | cslag |
|---|---|
| date | Thu, 09 Jun 2016 15:13:53 +0200 |
| parents | b15d814ba274 |
| children | d595eb90efdd |
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| 103:b15d814ba274 | 104:dbca6763f2be |
|---|---|
| 35 .align 2 | 35 .align 2 |
| 36 .globl dcCallbackThunkEntry | 36 .globl dcCallbackThunkEntry |
| 37 .ent dcCallbackThunkEntry | 37 .ent dcCallbackThunkEntry |
| 38 .type dcCallbackThunkEntry, @function | 38 .type dcCallbackThunkEntry, @function |
| 39 | 39 |
| 40 /* Called by thunk - thunk stores pointer to DCCallback in $12 ($t4), and pointer to called function in $25 ($t9, required for PIC) */ | 40 /* Called by thunk - thunk stores pointer to DCCallback in $12 ($t4), and */ |
| 41 /* pointer to called function in $25 ($t9, required for PIC) */ | |
| 41 dcCallbackThunkEntry: | 42 dcCallbackThunkEntry: |
| 42 .set noreorder | 43 .set noreorder |
| 43 .set nomacro | 44 .set nomacro |
| 44 | 45 |
| 45 /* Prolog. Just store the minimum, return address, frame pointer, spill area. */ | 46 /* Prolog. Just store the minimum, return address, spill area. */ |
| 46 subu $sp, 32 /* open frame: 32b for 8b aligned frame (retval+ra+fp+spill) */ | 47 /* Frame size of 48b comes from following areas (each 8b aligned); */ |
| 48 /* local: fpregs:16 + retval:8 + DCArgs:8 */ | |
| 49 /* save: ra:4 (+ pad:4) */ | |
| 50 /* param: spill:16 */ | |
| 51 subu $sp, 56 /* open frame */ | |
| 47 sw $ra, 20($sp) /* save link register */ | 52 sw $ra, 20($sp) /* save link register */ |
| 48 | 53 |
| 49 .frame $fp,32,$31 /* specify our frame: fp,size,lr; creates virt $fp */ | 54 .frame $fp,56,$31 /* specify our frame: fp,size,lr; creates virt $fp */ |
| 50 | 55 |
| 51 /* Init return value */ | 56 /* Init return value */ |
| 57 sw $zero, 32($sp) | |
| 58 sw $zero, 36($sp) | |
| 59 | |
| 60 /* Store the arguments passed via registers somewhere for dcArg* to access. */ | |
| 61 /* For $4-$7 ($a0-$a3), use dedicated spill area (caller doesn't spill, but */ | |
| 62 /* provides it at end of _caller's_ frame, so $fp points right to it). */ | |
| 63 /* For $f12 and $f14 use our space (in local data), which is adjacent. */ | |
| 64 s.d $f12, 40($sp) /* -16($fp) */ | |
| 65 s.d $f14, 48($sp) /* -8($fp) */ | |
| 66 sw $4, 0($fp) | |
| 67 sw $5, 4($fp) | |
| 68 sw $6, 8($fp) | |
| 69 sw $7, 12($fp) | |
| 70 | |
| 71 /* Init DCArg, which contains reg_count and stackptr* to the args. Point */ | |
| 72 /* stackptr to the area where the non-float args start (which is at $fp). */ | |
| 52 sw $zero, 24($sp) | 73 sw $zero, 24($sp) |
| 53 sw $zero, 28($sp) | 74 sw $fp, 28($sp) |
| 54 | |
| 55 /* If we spill the first four, all arguments will be in one out in consecutive block */ | |
| 56 /* Caller doesn't and it's up to us to spill, so let's write $4-$7 ($a0-$a3) to the */ | |
| 57 /* dedicated spill area, first (at end of _caller's_ frame, so $fp points right to it). */ | |
| 58 sw $7, 12($fp) | |
| 59 sw $6, 8($fp) | |
| 60 sw $5, 4($fp) | |
| 61 sw $4, 0($fp) | |
| 62 | |
| 63 /* Init DCArg, which contains stackptr* to the args, which is $fp. Use padding between */ | |
| 64 /* stored return address and parameter area as place to store it (hacky, but saves 8b) */ | |
| 65 sw $fp, 16($sp) | |
| 66 | 75 |
| 67 /* Prepare callback handler call. */ | 76 /* Prepare callback handler call. */ |
| 68 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */ | 77 move $4, $12 /* Param 0 = DCCallback*, $12 ($t4) holds pointer to thunk */ |
| 69 addiu $5, $sp, 16 /* Param 1 = DCArgs*, pointer to where pointer to args is stored */ | 78 addiu $5, $sp, 24 /* Param 1 = DCArgs*, pointer to where pointer to args is stored */ |
| 70 addiu $6, $sp, 24 /* Param 2 = results pointer to 8b of local data on stack */ | 79 addiu $6, $sp, 32 /* Param 2 = results pointer to 8b of local data on stack */ |
| 71 lw $7, 24($12) /* Param 3 = userdata pointer */ | 80 lw $7, 24($12) /* Param 3 = userdata pointer */ |
| 72 | 81 |
| 73 lw $25, 20($12) /* store handler entry in $25 ($t9), required for PIC */ | 82 lw $25, 20($12) /* store handler entry in $25 ($t9), required for PIC */ |
| 74 jalr $25 /* jump */ | 83 jalr $25 /* jump */ |
| 75 nop | 84 nop /* branch delay nop */ |
| 76 | 85 |
| 77 /* Copy result in corresponding registers $2-$3 ($v0-$v1) */ | 86 /* Copy result in corresponding registers $2-$3 ($v0-$v1) and $f0 */ |
| 78 lw $2, 24($sp) | 87 lw $2, 32($sp) |
| 79 lw $3, 28($sp) | 88 lw $3, 36($sp) |
| 89 l.d $f0, 32($sp) | |
| 80 | 90 |
| 81 /* Epilog. Tear down frame and return. */ | 91 /* Epilog. Tear down frame and return. */ |
| 82 lw $ra, 20($sp) /* restore return address */ | 92 lw $ra, 20($sp) /* restore return address */ |
| 83 addiu $sp, $sp, 32 /* close frame */ | 93 addiu $sp, $sp, 56 /* close frame */ |
| 84 j $ra /* return */ | 94 j $ra /* return */ |
| 85 nop | 95 nop /* branch delay nop */ |
| 86 | 96 |
| 87 .set macro | 97 .set macro |
| 88 .set reorder | 98 .set reorder |
| 89 .end dcCallbackThunkEntry | 99 .end dcCallbackThunkEntry |
| 90 .ident "handwritten" | 100 .ident "handwritten" |