36 lines
460 B
ArmAsm
36 lines
460 B
ArmAsm
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.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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! a1 : return 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 -(sp)
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move.b (a0), (3,sp) !1 byte
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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 -(sp)
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move.w (a0), (2,sp) !2 bytes
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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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sub.l #1, d0
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4: move.l -(a0), -(sp)
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dbf d0, 4b
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3:
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jmp (a1)
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.align 2
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