28 lines
344 B
ArmAsm
28 lines
344 B
ArmAsm
.define .exg
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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 : exchange size in bytes
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.sect .text
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.exg:
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move.l (sp)+,d2 ! return address
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move.l sp,a1
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sub.w d0,sp
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move.l sp,a0
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move.w d0,d1
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1:
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move.w (a1)+,(a0)+
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sub #1,d0
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bgt 1b
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move.l sp,a1
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asr #1,d1
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1:
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move.w (a1)+,(a0)+
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sub #1,d1
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bgt 1b
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move.l a1,sp
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move.l d2,-(sp)
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rts
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