1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8#if defined(SYSLIBC_SCCS) && !defined(lint) 9 .asciz "@(#)syscall.s 8.1 (Berkeley) 06/04/93" 10#endif /* SYSLIBC_SCCS and not lint */ 11 12#include "SYS.h" 13 14ENTRY(syscall) 15 pushl 4(fp) # syscall number 16 movl fp,r0 # point to the arg list 17 movl -4(fp),r1 # (arg_count + 1) (bytes) | mask 18 andl2 $0xFFFF,r1 # clear the mask bits 19 shrl $2,r1,r1 # convert to words 20 subl2 $2,r1 # don't count the first arg 211: 22 addl2 $4,r0 # point to the next arg 23 movl 4(r0),(r0) # move an arg down 24 decl r1 # count it 25 jgtr 1b # any more? 26 movl (sp)+,r0 # no, get the syscall number back 27 kcall r0 28 jcs 1f 29 ret 301: 31 jmp cerror 32