4.1cBSD/usr/src/lib/libc/sys/syscall.c

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/* syscall.c 4.1 82/12/04 */

#include "SYS.h"

ENTRY(syscall)
	movl	4(ap),r0	# syscall number
	subl3	$1,(ap)+,(ap)	# one fewer arguments
	chmk	r0
	ret