ack/mach/i86/libem/iaar.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
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.define .iaar
.iaar:
pop cx
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pop dx
cmp dx,2
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.extern .unknown
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jne .unknown
pop bx ! descriptor address
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pop ax ! index
sub ax,(bx)
mul 4(bx)
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pop bx ! base address
add bx,ax
push cx
ret