ack/mach/i86/libem/csa2.s

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.sect .text; .sect .rom; .sect .data; .sect .bss
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.define .csa2
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.sect .text
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.csa2:
! bx, descriptor address
! ax, index
mov dx,(bx) ! default
sub ax,2(bx)
cmp ax,4(bx)
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ja 1f
sal ax,1
add bx,ax
mov bx,6(bx)
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test bx,bx
jnz 2f
1:
mov bx,dx
test bx,bx
jnz 2f
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.extern ECASE
.extern .fat
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mov ax,ECASE
push ax
jmp .fat
2:
jmp bx