1/* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18#if defined(SYSLIBC_SCCS) && !defined(lint) 19 .asciz "@(#)syscall.s 5.3 (Berkeley) 06/27/88" 20#endif /* SYSLIBC_SCCS and not lint */ 21 22#include "SYS.h" 23 24ENTRY(syscall) 25 pushl 4(fp) # syscall number 26 movl fp,r0 # point to the arg list 27 movl -4(fp),r1 # (arg_count + 1) (bytes) | mask 28 andl2 $0xFFFF,r1 # clear the mask bits 29 shrl $2,r1,r1 # convert to words 30 subl2 $2,r1 # don't count the first arg 311: 32 addl2 $4,r0 # point to the next arg 33 movl 4(r0),(r0) # move an arg down 34 decl r1 # count it 35 jgtr 1b # any more? 36 movl (sp)+,r0 # no, get the syscall number back 37 kcall r0 38 jcs 1f 39 ret 401: 41 jmp cerror 42