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/* ppc-sysv-asm.S -- PowerPC FFI trampoline for Mach-O -*- asm -*-
*
* Author: Ian.Piumarta@INRIA.Fr
*
* Last edited: 2006-10-18 10:08:10 by piumarta on emilia.local
*
* Copyright (C) 1996-2004 by Ian Piumarta and other authors/contributors
* listed elsewhere in this file.
* All rights reserved.
*
* This file is part of Unix Squeak.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* Mach-O PPC stack frames look like this (higher addresses first):
*
* | caller's lr |
* | caller's cr |
* caller's sp->| caller's caller's sp |
* | fpr save area |
* | gpr save area |
* | [alignment pad] |
* | local variables |
* sp + 24 -> | param save area |
* sp + 20 -> | caller's toc |
* sp + 16 -> | reserved |
* sp + 12 -> | reserved |
* sp + 8 -> | (callee-save) lr |
* sp + 4 -> | (callee-save) cr |
* sp + 0 -> | caller's sp |
*/
#define GPR_MAX 8
#define FPR_MAX 13
#define ARG_MAX 512
#define FRAMESZ 32
#include "ppc-global.h"
#define sp r1
.text
.globl _ffiCallAddressOf
_ffiCallAddressOf:
stwu sp, -FRAMESZ(sp) // push trampoline frame
mflr r0
stw r0, (FRAMESZ+8)(sp)
mfcr r0
stw r0, (FRAMESZ+4)(sp) // saved ccr
mtlr r3 // destination fn address
stw r4, (FRAMESZ-4)(sp) // globals
lwz r5, stackIndex(r4)
slwi r10, r5, 2 // param save area size
addi r10, r10, 32+15 // round to quad word
rlwinm r10, r10, 0,0,27
neg r10, r10
stwux sp, sp, r10 // push ffi caller frame
cmpwi r5, 0 // have params?
beq+ 2f
mtctr r5 // words to move
la r10, (stack-4)(r4) // ffi param stack - 4
addi r11, sp, 24-4 // param save area - 4
1: lwzu r0, 4(r10) // copy param save area
stwu r0, 4(r11)
bdnz 1b
2: lwz r5, fprCount(r4)
cmpwi r5, 0
beq+ 4f // no fp args
la r11, fprs(r4)
cmpwi r5, 4
ble+ 3f
lfd f5, 32(r11)
lfd f6, 40(r11)
lfd f7, 48(r11)
lfd f8, 56(r11)
# if (FPR_MAX > 8)
lfd f9, 64(r11)
lfd f10, 72(r11)
lfd f11, 80(r11)
lfd f12, 88(r11)
lfd f13, 96(r11)
# endif
3: lfd f1, 0(r11)
lfd f2, 8(r11)
lfd f3, 16(r11)
lfd f4, 24(r11)
4: lwz r5, gprCount(r4)
cmpwi r5, 0
beq- 6f // no int args
la r11, gprs(r4)
cmpwi r5, 4
ble+ 5f
lwz r7, 16(r11)
lwz r8, 20(r11)
lwz r9, 24(r11)
lwz r10, 28(r11)
5: lwz r3, 0(r11)
lwz r4, 4(r11)
lwz r5, 8(r11)
lwz r6, 12(r11)
6: blrl // callout
lwz sp, 0(sp) // pop ffi caller frame
lwz r5, (FRAMESZ-4)(sp) // globals
stw r3, longReturnValue+0(r5)
stw r4, longReturnValue+4(r5)
stfd f1, floatReturnValue(r5)
lwz r0, (FRAMESZ+8)(sp)
mtlr r0
lwz r0, (FRAMESZ+4)(sp) // saved ccr
mtcr r0
addi sp, sp, FRAMESZ // pop trampoline frame
blr
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