ack/mach/m68k4/libem/exg.s

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338 B
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.define .exg
.sect .text
.sect .rom
.sect .data
.sect .bss
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! d0 : exchange size in bytes
.sect .text
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.exg:
move.l (sp)+,d2
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move.l sp,a1
sub.l d0,sp
move.l sp,a2
asr #1,d0
move.l d0,d1
1:
move.l (a1)+,(a2)+
sub #1,d0
bgt 1b
move.l sp,a1
asr #1,d1
1:
move.l (a1)+,(a2)+
sub #1,d1
bgt 1b
move.l a1,sp
move.l d2,-(sp)
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rts