35 lines
539 B
ArmAsm
35 lines
539 B
ArmAsm
.define .inn
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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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ESET=2
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.inn: ! d0 bitnumber
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! d1 setsize in bytes
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! on exit: 0 or 1 in d0
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move.l d2, -(sp)
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move.l d0, d2
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asr.l #3, d2 ! offset 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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bge 1f ! bitnumber too large
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btst d0, (8,sp,d2.l)
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beq 2f
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move.l #1, d0
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bra 3f
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1:
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move.l #ESET, -(sp)
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jsr (.trp)
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2:
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clr.l d0
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3:
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move.l (sp)+, d2
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move.l (sp)+, a0 ! return address
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add.l d1, sp ! pop bitset
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jmp (a0) ! return
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.align 2
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