31 lines
465 B
ArmAsm
31 lines
465 B
ArmAsm
.define .set
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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.set: ! d0 bitnumber
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! d1 setsize in bytes
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move.l (sp)+,a0
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move.l d1, d2
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asr.l #2, d2
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sub.l #1, d2
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1:
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clr.l -(sp)
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dbf d2, 1b
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move.l d0, d2
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asr.l #3, d2 ! offset .sect from sp in bytes
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eor.l #3, d2 ! longs are stored in high-to-low order
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cmp.l d1, d2
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blt 2f
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move.l a0, -(sp)
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move.l #ESET, -(sp) ! bitnumber too large
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jsr .trp
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rts
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2:
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bset d0, 0(sp, d2.l)
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jmp (a0)
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.align 2
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