ack/mach/i86/libem/exg.s

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ArmAsm
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.sect .text; .sect .rom; .sect .data; .sect .bss
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.define .exg
! #bytes in cx
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.sect .text
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.exg:
push di
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mov di,sp
add di,4
mov bx,di
add bx,cx
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sar cx,1
1:
mov ax,(bx)
xchg ax,(di)
mov (bx),ax
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add di,2
add bx,2
loop 1b
2:
pop di
ret