20 lines
304 B
ArmAsm
20 lines
304 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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.sect .text
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! d0 : exchange size in bytes
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.exg:
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lea 4(sp, d0), a0 ! address of bottom block
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lea 4(sp), a1 ! address of top block
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asr.l #2, d0
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sub.l #1, d0
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1:
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move.l (a1), d1
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move.l (a0), (a1)+
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move.l d1, (a0)+
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dbf d0, 1b
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rts
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.align 2
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