ack/mach/i86/libem/dup.s

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ArmAsm
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.sect .text; .sect .rom; .sect .data; .sect .bss
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.define .dup
! #bytes in cx
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.sect .text
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.dup:
pop bx ! return address
mov ax,si
mov dx,di
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mov si,sp
sub sp,cx
mov di,sp
sar cx,1
rep movs
mov si,ax
mov di,dx
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jmp bx