ack/plat/pdpv7/libsys/fork.s

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ArmAsm
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#include "sys.h"
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.define _fork
.extern _errno
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_fork:
sys fork
br 1f
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bcc 2f
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mov r0,_errno
mov $-1,r0
2:
rts pc
1:
clr r0
rts pc