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Old 23 June 2012, 08:11   #1
NovaCoder
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Location: Melbourne/Australia
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GCC Assembler return value question...

I'm using GCC to 'talk' to my assembler files.

To call a function that doesn't return anything like this:
Code:
void __asm c2p8_deinit(register __a0 void *c2p);
I have to do this:
Code:
static inline void c2p8_deinit_stub(void *c2p) {

    register void *_c2p __asm("a0") = c2p;

    __asm("jsr _c2p8_deinit" : : "r" (_c2p) : "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a1", "a2", "a3", "a4", "cc", "memory");
}


Anyone got a clue what I would do for this puppy which returns a pointer?

Code:
void __asm *c2p8_reloc(register __a0 struct BitMap *bitmap);



Code:
_c2p8_reloc
@c2p8_reloc
	movem.l d2-d7/a2-a6,-(sp)

	move.l	a0,-(sp)
	move.l  #_c2p8_end-_c2p8start,d0
	move.l  #MEMF_FAST,d1
	move.l	4.w,a6
	jsr     _LVOAllocVec(a6)
	move.l	(sp)+,a3
	tst.l   d0
	beq     .fail
	move.l  d0,a0                   ; FIXME: align by cache line
					; size and make changes to
					; the c2p too.
	lea     _c2p8start,a1
	move.w  #_c2p8_end-_c2p8start-1,d1
.loop
	move.b  (a1)+,(a0)+
	dbf     d1,.loop

	move.l	bm_Planes(a3),d2

	move.l  d0,a0
	move.l  bm_Planes+4(a3),d1
	sub.l   d2,d1
	patch	c2p8_p1_1
	patch	c2p8_p1_2
	move.l  bm_Planes+8(a3),d1
	sub.l   d2,d1
	patch	c2p8_p2_1
	patch	c2p8_p2_2
	move.l  bm_Planes+12(a3),d1
	sub.l   d2,d1
	patch	c2p8_p3_1
	patch	c2p8_p3_2
	move.l  bm_Planes+16(a3),d1
	sub.l   d2,d1
	patch	c2p8_p4_1
	patch	c2p8_p4_2
	move.l  bm_Planes+20(a3),d1
	sub.l   d2,d1
	patch	c2p8_p5_1
	patch	c2p8_p5_2
	move.l  bm_Planes+24(a3),d1
	sub.l   d2,d1
	patch	c2p8_p6_1
	patch	c2p8_p6_2
	move.l  bm_Planes+28(a3),d1
	sub.l   d2,d1
	patch	c2p8_p7_1
	patch	c2p8_p7_2

	move.l	d0,-(sp)
	move.l	4.w,a6
	jsr     _LVOCacheClearU(a6)
	move.l	(sp)+,d0

.fail
	movem.l (sp)+,d2-d7/a2-a6
	rts

	cnop    0,16
I hate having to answer my own assembler questions again but anyway for the benefit of others...

Code:
/*
void  *c2p8_reloc(register __a0 struct BitMap *bitmap);
void  c2p8_deinit(register __a0 void *c2p);
void  c2p8(register __a0 void *c2p,
		register __a1 struct BitMap *bmp,
		register __a2 UBYTE *chunky,
		register __d0 ULONG size);
*/


void *c2p8_reloc_stub(struct BitMap *bitmap) {

    register void *_return __asm("d0");

    register struct BitMap *_bitmap __asm("a0") = bitmap;

    __asm("jsr _c2p8_reloc" : : "r" (_return), "r" (_bitmap) : "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a1", "a2", "a3", "a4", "cc", "memory");

    return _return;
}

static inline void c2p8_deinit_stub(void *c2p) {

    register void *_c2p __asm("a0") = c2p;

    __asm("jsr _c2p8_deinit" : : "r" (_c2p) : "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a1", "a2", "a3", "a4", "cc", "memory");
}

static inline void c2p8_stub(void *c2p, struct BitMap *bitmap, UBYTE *chunky, ULONG size) {

    register ULONG _size __asm("d0") = size;

    register void *_c2p __asm("a0") = c2p;
    register struct BitMap *_bitmap __asm("a1") = bitmap;
    register UBYTE *_chunky __asm("a2") = chunky;

   __asm("jsr _c2p8" : : "r" (_size), "r" (_c2p), "r" (_bitmap), "r" (_chunky) : "d1", "d2", "d4", "d6", "d7", "a3", "a4", "cc", "memory");
}

Last edited by NovaCoder; 26 June 2012 at 15:09. Reason: Because I worked it out myself...
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