1/* syscall.s 4.2 83/06/27 */ 2 3#include "SYS.h" 4 5ENTRY(syscall) 6 movl 4(ap),r0 # syscall number 7 subl3 $1,(ap)+,(ap) # one fewer arguments 8 chmk r0 9 jcs 1f 10 ret 111: 12 jmp cerror 13