ack/mach/pdp/libsys/vfork.s

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ArmAsm
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#include "sys.h"
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.define _vfork
.extern _errno
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_vfork:
mov (sp)+,r1
sys vfork
br 1f
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bcc 2f
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3: mov r0,_errno
mov $-1,r0
jmp (r1)
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1: ! child, or vfork systemcall does not exist
bcs 3b
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clr r0
2:
jmp (r1)