exception.c

U-boot源码 ARM7启动代码

/*
 * (C) Copyright 2007 Michal Simek
 *
 * Michal  SIMEK <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/asm.h>

void _hw_exception_handler (void)
{
	int address = 0;
	int state = 0;
	/* loading address of exception EAR */
	MFS (address, rear);
	/* loading excetpion state register ESR */
	MFS (state, resr);
	printf ("Hardware exception at 0x%x address\n", address);
	switch (state & 0x1f) {	/* mask on exception cause */
	case 0x1:
		puts ("Unaligned data access exception\n");
		break;
	case 0x2:
		puts ("Illegal op-code exception\n");
		break;
	case 0x3:
		puts ("Instruction bus error exception\n");
		break;
	case 0x4:
		puts ("Data bus error exception\n");
		break;
	case 0x5:
		puts ("Divide by zero exception\n");
		break;
#ifdef MICROBLAZE_V5
	case 0x1000:
		puts ("Exception in delay slot\n");
		break;
#endif
	default:
		puts ("Undefined cause\n");
		break;
	}
	printf ("Unaligned %sword access\n", ((state & 0x800) ? "" : "half"));
	printf ("Unaligned %s access\n", ((state & 0x400) ? "store" : "load"));
	printf ("Register R%x\n", (state & 0x3E) >> 5);
	hang ();
}

#ifdef CFG_USR_EXCEP
void _exception_handler (void)
{
	puts ("User vector_exception\n");
	hang ();
}
#endif