trap.c

微内核软实时操作系统

/*-
 * Copyright (c) 2005, Kohsuke Ohtani
 * 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. Neither the name of the author nor the names of any co-contributors 
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

/*
 * trap.c - trap handling routine
 */

#include <kernel.h>
#include <except.h>
#include <thread.h>
#include <task.h>
#include "cpu.h"

#ifdef DEBUG
void trap_dump(struct cpu_regs *);

static char *const trap_name[] = {
	"Reset",		
	"Undefined instruction",
	"Software interrupt",
	"Prefetch abort",
	"Data abort",
	"Reserved",
	"IRQ",
	"FIQ",
};
#define MAX_TRAP (sizeof(trap_name) / sizeof(void *) - 1)
#endif	/* DEBUG */

/*
 * Trap/exception mapping table.
 * ARM exception is translated to the architecture
 * independent exception code.
 */
static const int trap_map[] = {
	0,
	EXC_ILL,	/* Undefined instruction */
	0,
	EXC_SEGV,	/* Prefech abort */
	EXC_SEGV,	/* Data abort */
	0,
	0,
};

/*
 * TODO: Need to implement trap code
 */