xref: /freebsd-10.3-release/sys/arm/arm/syscall.c

/*	$NetBSD: fault.c,v 1.45 2003/11/20 14:44:36 scw Exp $	*/

/*-
 * Copyright 2004 Olivier Houchard
 * Copyright 2003 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Steve C. Woodford for Wasabi Systems, Inc.
 *
 * 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 for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */
/*-
 * Copyright (c) 1994-1997 Mark Brinicombe.
 * Copyright (c) 1994 Brini.
 * All rights reserved.
 *
 * This code is derived from software written for Brini by Mark Brinicombe
 *
 * 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 Brini.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY BRINI ``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 BRINI 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.
 *
 * RiscBSD kernel project
 *
 * fault.c
 *
 * Fault handlers
 *
 * Created      : 28/11/94
 */


#include <sys/cdefs.h>
__FBSDID("$FreeBSD: releng/10.3/sys/arm/arm/syscall.c 278656 2015-02-13 02:02:12Z ian $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <sys/signalvar.h>
#include <sys/ptrace.h>
#include <sys/pioctl.h>

#include <machine/frame.h>

void swi_handler(struct trapframe *);

static __inline void
call_trapsignal(struct thread *td, int sig, u_long code)
{
	ksiginfo_t ksi;

	ksiginfo_init_trap(&ksi);
	ksi.ksi_signo = sig;
	ksi.ksi_code = (int)code;
	trapsignal(td, &ksi);
}

int
cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
{
	struct proc *p;
	register_t *ap;
	int error;

	sa->code = td->td_frame->tf_r7;
	ap = &td->td_frame->tf_r0;
	if (sa->code == SYS_syscall) {
		sa->code = *ap++;
		sa->nap--;
	} else if (sa->code == SYS___syscall) {
		sa->code = ap[_QUAD_LOWWORD];
		sa->nap -= 2;
		ap += 2;
	}
	p = td->td_proc;
	if (p->p_sysent->sv_mask)
		sa->code &= p->p_sysent->sv_mask;
	if (sa->code >= p->p_sysent->sv_size)
		sa->callp = &p->p_sysent->sv_table[0];
	else
		sa->callp = &p->p_sysent->sv_table[sa->code];
	sa->narg = sa->callp->sy_narg;
	error = 0;
	memcpy(sa->args, ap, sa->nap * sizeof(register_t));
	if (sa->narg > sa->nap) {
		error = copyin((void *)td->td_frame->tf_usr_sp, sa->args +
		    sa->nap, (sa->narg - sa->nap) * sizeof(register_t));
	}
	if (error == 0) {
		td->td_retval[0] = 0;
		td->td_retval[1] = 0;
	}
	return (error);
}

#include "../../kern/subr_syscall.c"

static void
syscall(struct thread *td, struct trapframe *frame)
{
	struct syscall_args sa;
	int error;

	sa.nap = 4;

	error = syscallenter(td, &sa);
	KASSERT(error != 0 || td->td_ar == NULL,
	    ("returning from syscall with td_ar set!"));
	syscallret(td, error, &sa);
}

void
swi_handler(struct trapframe *frame)
{
	struct thread *td = curthread;

	td->td_frame = frame;

	td->td_pticks = 0;
	/*
	 * Make sure the program counter is correctly aligned so we
	 * don't take an alignment fault trying to read the opcode.
	 * XXX: Fix for Thumb mode
	 */
	if (__predict_false(((frame->tf_pc - INSN_SIZE) & 3) != 0)) {
		call_trapsignal(td, SIGILL, 0);
		userret(td, frame);
		return;
	}
	/*
	 * Enable interrupts if they were enabled before the exception.
	 * Since all syscalls *should* come from user mode it will always
	 * be safe to enable them, but check anyway.
	 */
	if (td->td_md.md_spinlock_count == 0) {
		if (__predict_true(frame->tf_spsr & PSR_I) == 0)
			enable_interrupts(PSR_I);
		if (__predict_true(frame->tf_spsr & PSR_F) == 0)
			enable_interrupts(PSR_F);
	}

	syscall(td, frame);
}