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/* ppc-sysv-asm.S -- PowerPC FFI trampoline for SVr4-like ABIs -*- asm -*-
*
* Author: Ian.Piumarta@INRIA.Fr
*
* Last edited: 2006-10-18 10:07:42 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.
*/
#define r0 0
#define sp 1
#define r2 2
#define r3 3
#define r4 4
#define r5 5
#define r6 6
#define r7 7
#define r8 8
#define r9 9
#define r10 10
#define r11 11
#define r12 12
#define f1 1
#define f2 2
#define f3 3
#define f4 4
#define f5 5
#define f6 6
#define f7 7
#define f8 8
#define f9 9
#define f10 10
#define f11 11
#define f12 12
#define f13 13
/* V.4 stack frames look like this (higher addresses first):
old SP--> | back chain to caller's caller |
| Save area for FP registers (F) | 8+P+A+V+L+X+C+G
| Save area for GP registers (G) | 8+P+A+V+L+X+C
| saved CR (C) | 8+P+A+V+L+X
| Float/int conversion temporary (X) | 8+P+A+V+L
| Local variable space (L) | 8+P+A+V
| Varargs save area (V) | 8+P+A
| Alloca space (A) | 8+P
| Parameter save area (P) | 8
| caller's saved LR | 4
SP--> | back chain to caller | 0
*/
#define fn r3
#define ngpr r4
#define nfpr r5
#define nparam r6
.text
.globl ffiCallAddressOf
ffiCallAddressOf:
stwu sp, -16(sp) // push trampoline frame
mflr r0
stw r0, 20(sp)
mfcr r0
stw r0, 12(sp) // saved ccr
mtlr fn // destination fn address
slwi r10, nparam, 2 // param save area size
addi r10, r10, 16+15 // round to quad word
rlwinm r10, r10, 0,0,27
neg r10, r10
stwux sp, sp, r10 // push ffi caller frame
cmpwi nparam, 0 // have params?
beq+ 2f
mtctr nparam // words to move
lis r10, (ffiStack-4)@ha
la r10, (ffiStack-4)@l(r10) // ffi param stack - 4
addi r11, sp, 4 // param save area - 4
1: lwzu r0, 4(r10) // copy param save area
stwu r0, 4(r11)
bdnz 1b
2: cmpwi nfpr, 0
beq+ 4f // no fp args
lis r11, ffiFPRs@ha
la r11, ffiFPRs@l(r11)
cmpwi nfpr, 4
ble+ 3f
lfd f5, 32(r11)
lfd f6, 40(r11)
lfd f7, 48(r11)
lfd f8, 56(r11)
3: lfd f1, 0(r11)
lfd f2, 8(r11)
lfd f3, 16(r11)
lfd f4, 24(r11)
4: cmpwi ngpr, 0
beq- 6f // no int args
lis r11, ffiGPRs@ha
la r11, ffiGPRs@l(r11)
cmpwi ngpr, 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
lis r5, ffiLongReturnValue@ha
la r5, ffiLongReturnValue@l(r5)
stw r3, 0(r5)
stw r4, 4(r5)
lis r5, ffiFloatReturnValue@ha
stfd f1, ffiFloatReturnValue@l(r5)
lwz r0, 20(sp)
mtlr r0
lwz r0, 12(sp) // saved ccr
mtcr r0
addi sp, sp, 16 // pop trampoline frame
blr
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