ack/mach/pdp/libsys/rtp.s

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ArmAsm
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#include "sys.h"
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.define _rtp
.extern _errno
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_rtp:
mov 2(sp),r0
sys rtp
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bcc 1f
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mov r0,_errno
mov $-1,r0
rts pc
1:
clr r0
rts pc