ack/mach/m68k4/libem/inn.s

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.define .inn
.sect .text
.sect .rom
.sect .data
.sect .bss
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.sect .text
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.inn: ! d0 bitnumber
! d1 setsize in bytes
! on exit: 0 or 1 in d0
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move.l d2, -(sp)
move.l d0, d2
asr.l #3, d2 ! offset .sect from sp in bytes
eor.l #3, d2 ! longs are stored in high-to-low order
cmp.l d1, d2
bge 1f ! bitnumber too large
btst d0, 8(sp, d2.l)
beq 2f
move.l #1, d0
bra 3f
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1:
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move.l #ESET, -(sp)
jsr .trp
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2:
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clr.l d0
3:
move.l (sp)+, d2
move.l (sp)+, a0 ! return address
add.l d1, sp ! pop bitset
jmp (a0) ! return
.align 2