ack/mach/m68k2/libem/rck.s

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.define .rck
.sect .text
.sect .rom
.sect .data
.sect .bss
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.sect .text
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.rck:
move.l (sp)+,a1
move.l (sp)+,a0 ! descriptor address
move.w (sp),d0
cmp (a0),d0
blt 1f
cmp 2(a0),d0
ble 2f
1:
move.w #ERANGE,-(sp)
jsr .trp
2:
jmp (a1)