ack/mach/pdp/libsys/fperr.s

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ArmAsm
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#include "sys.h"
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.define _fperr
.extern _errno
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_fperr:
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sys local; .data2 0f
bcc 1f
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mov r0,_errno
mov $-1,r0
rts pc
1:
mov r5,-(sp)
mov 4(sp),r5
mov r0,(r5)+
mov r1,(r5)
mov (sp)+,r5
rts pc
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.sect .data
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0:
sys fperr