37 lines
459 B
ArmAsm
37 lines
459 B
ArmAsm
.define .los
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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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! d0 : # bytes
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! a0 : source address
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.sect .text
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.los:
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move.l (sp)+,a1
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move.l (sp)+,d0
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move.l (sp)+,a0
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cmp.l #1,d0
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bne 1f
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clr.l d0 !1 byte
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move.b (a0),d0
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move.l d0,-(sp)
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bra 3f
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1:
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cmp.l #2,d0
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bne 2f
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clr.l d0 !2 bytes
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add.l #2,a0
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move.w (a0),d0
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move.l d0,-(sp)
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bra 3f
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2:
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add.l d0,a0 !>=4 bytes
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asr.l #2,d0
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4: move.l -(a0),-(sp)
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sub.l #1,d0
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bgt 4b
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3:
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jmp (a1)
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.align 2
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