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fix syscall debugging

/*	$OpenBSD: kern_xxx.c,v 1.4 1996/08/26 09:16:01 deraadt Exp $	*/
/*	$NetBSD: kern_xxx.c,v 1.32 1996/04/22 01:38:41 christos Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)kern_xxx.c	8.2 (Berkeley) 11/14/93
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <vm/vm.h>
#include <sys/sysctl.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>

/* ARGSUSED */
int
sys_reboot(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct sys_reboot_args /* {
		syscallarg(int) opt;
	} */ *uap = v;
	int error;

	if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
		return (error);
	boot(SCARG(uap, opt));
	return (0);
}

#ifdef SYSCALL_DEBUG
#define	SCDEBUG_CALLS		0x0001	/* show calls */
#define	SCDEBUG_RETURNS		0x0002	/* show returns */
#define	SCDEBUG_ALL		0x0004	/* even syscalls that are implemented */
#define	SCDEBUG_SHOWARGS	0x0008	/* show arguments to calls */

int	scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;

void
scdebug_call(p, code, args)
	struct proc *p;
	register_t code, args[];
{
	struct sysent *sy;
	struct emul *em;
	int i;

	if (!(scdebug & SCDEBUG_CALLS))
		return;

	em = p->p_emul;
	sy = &em->e_sysent[code];
	if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
	     sy->sy_call == sys_nosys))
		return;
		
	printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
	if (code < 0 || code >= em->e_nsysent)
		printf("OUT OF RANGE (%d)", code);
	else {
		printf("%d call: %s", code, em->e_syscallnames[code]);
		if (scdebug & SCDEBUG_SHOWARGS) {
			printf("(");
			for (i = 0; i < sy->sy_argsize / sizeof(register_t);
			    i++)
				printf("%s0x%lx", i == 0 ? "" : ", ",
				    (long)args[i]);
			printf(")");
		}
	}
	printf("\n");
}

void
scdebug_ret(p, code, error, retval)
	struct proc *p;
	register_t code;
	int error;
	register_t retval[];
{
	struct sysent *sy;
	struct emul *em;

	if (!(scdebug & SCDEBUG_RETURNS))
		return;

	em = p->p_emul;
	sy = &em->e_sysent[code];
	if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
	    sy->sy_call == sys_nosys))
		return;
		
	printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
	if (code < 0 || code >= em->e_nsysent)
		printf("OUT OF RANGE (%d)", code);
	else
		printf("%d ret: err = %d, rv = 0x%lx,0x%lx", code,
		    error, (long)retval[0], (long)retval[1]);
	printf("\n");
}
#endif /* SYSCALL_DEBUG */