ack/mach/i86/libem/rck.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
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.define .rck
! descriptor address in si
! value in ax, must be left there
.rck:
cmp ax,(si)
jl 2f
cmp ax,2(si)
jg 2f
ret
2:
push ax
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.extern ERANGE
.extern .error
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mov ax,ERANGE
call .error
pop ax
ret