40 lines
507 B
ArmAsm
40 lines
507 B
ArmAsm
.define .dvu
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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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! unsigned long divide
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! register usage:
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! : d2 divisor
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! d1 dividend
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! exit : d1 quotient
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! d0 remainder
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.sect .text
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.dvu:
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move.l 4(sp),d2
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move.l 8(sp),d1
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move.l d3,-(sp)
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tst.l d2
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bne 0f
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move.l #EIDIVZ,-(sp)
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jsr .trp
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0:
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clr.l d0
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move.l #31,d3
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3:
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lsl.l #1,d1
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roxl.l #1,d0
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cmp.l d2,d0
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blt 4f
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sub.l d2,d0
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add #1,d1
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4:
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dbf d3,3b
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move.l (sp)+,d3
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move.l (sp)+,a0
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add.l #8,sp
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move.l a0,-(sp)
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rts
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.align 2
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