ack/mach/m68k4/libem/set.s

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431 B
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.define .set
.sect .text
.sect .rom
.sect .data
.sect .bss
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! d0 : setsize in bytes
! d1 : bitnumber
.sect .text
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.set:
move.l (sp)+,a0
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move.l (sp)+,d1
move.l d0,d2
asr.l #2,d2
1:
clr.l -(sp) !create empty set
sub.l #1,d2
bgt 1b
move.l sp,a1 ! set base
move.l d1,d2
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asr.l #3,d2
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cmp.l d0,d2
bcs 1f
move.w #ESET,-(sp)
jsr .trp
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1:
bclr #0,d2
bclr #1,d2
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add.l d2,a1
clr.l d2
bset d1,d2
move.l d2,(a1)
jmp (a0)