ack/mach/i86/libem/trp.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
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.define .trp
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.extern .trppc, .stop
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! ax is trap number
.trp:
xor bx,bx
xchg bx,(.trppc)
test bx,bx
jz 2f
push ax
call bx
pop ax
ret
2:
call .stop