[people/ms/u-boot.git] / arch / powerpc / cpu / mpc5xxx / traps.c

/*
 * linux/arch/powerpc/kernel/traps.c
 *
 * Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
 *
 * Modified by Cort Dougan (cort@cs.nmt.edu)
 * and Paul Mackerras (paulus@cs.anu.edu.au)
 * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
 *
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * 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
 */

/*
 * This file handles the architecture-dependent parts of hardware exceptions
 */

#include <common.h>
#include <command.h>
#include <kgdb.h>
#include <asm/processor.h>

/* Returns 0 if exception not found and fixup otherwise.  */
extern unsigned long search_exception_table(unsigned long);

/* THIS NEEDS CHANGING to use the board info structure.
*/
#define END_OF_MEM	0x02000000

/*
 * Trap & Exception support
 */

static void print_backtrace(unsigned long *sp)
{
	int cnt = 0;
	unsigned long i;

	printf("Call backtrace: ");
	while (sp) {
		if ((uint)sp > END_OF_MEM)
			break;

		i = sp[1];
		if (cnt++ % 7 == 0)
			printf("\n");
		printf("%08lX ", i);
		if (cnt > 32) break;
		sp = (unsigned long *)*sp;
	}
	printf("\n");
}

void show_regs(struct pt_regs *regs)
{
	int i;

	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
	       regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
	       regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
	       regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
	       regs->msr&MSR_IR ? 1 : 0,
	       regs->msr&MSR_DR ? 1 : 0);

	printf("\n");
	for (i = 0;  i < 32;  i++) {
		if ((i % 8) == 0)
		{
			printf("GPR%02d: ", i);
		}

		printf("%08lX ", regs->gpr[i]);
		if ((i % 8) == 7)
		{
			printf("\n");
		}
	}
}


static void _exception(int signr, struct pt_regs *regs)
{
	show_regs(regs);
	print_backtrace((unsigned long *)regs->gpr[1]);
	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
}

void MachineCheckException(struct pt_regs *regs)
{
	unsigned long fixup;

	/* Probing PCI using config cycles cause this exception
	 * when a device is not present.  Catch it and return to
	 * the PCI exception handler.
	 */
	if ((fixup = search_exception_table(regs->nip)) != 0) {
		regs->nip = fixup;
		return;
	}

#if defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif

	printf("Machine check in kernel mode.\n");
	printf("Caused by (from msr): ");
	printf("regs %p ",regs);
	/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
	switch( regs->msr & 0x000F0000)
	{
	case (0x80000000>>12) :
		printf("Machine check signal - probably due to mm fault\n"
			"with mmu off\n");
		break;
	case (0x80000000>>13) :
		printf("Transfer error ack signal\n");
		break;
	case (0x80000000>>14) :
		printf("Data parity signal\n");
		break;
	case (0x80000000>>15) :
		printf("Address parity signal\n");
		break;
	default:
		printf("Unknown values in msr\n");
	}
	show_regs(regs);
	print_backtrace((unsigned long *)regs->gpr[1]);
	panic("machine check");
}

void AlignmentException(struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif
	show_regs(regs);
	print_backtrace((unsigned long *)regs->gpr[1]);
	panic("Alignment Exception");
}

void ProgramCheckException(struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif
	show_regs(regs);
	print_backtrace((unsigned long *)regs->gpr[1]);
	panic("Program Check Exception");
}

void SoftEmuException(struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif
	show_regs(regs);
	print_backtrace((unsigned long *)regs->gpr[1]);
	panic("Software Emulation Exception");
}


void UnknownException(struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif
	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	       regs->nip, regs->msr, regs->trap);
	_exception(0, regs);
}

#if defined(CONFIG_CMD_BEDBUG)
extern void do_bedbug_breakpoint(struct pt_regs *);
#endif

void DebugException(struct pt_regs *regs)
{

  printf("Debugger trap at @ %lx\n", regs->nip );
  show_regs(regs);
#if defined(CONFIG_CMD_BEDBUG)
  do_bedbug_breakpoint( regs );
#endif
}

/* Probe an address by reading.  If not present, return -1, otherwise
 * return 0.
 */
int addr_probe(uint *addr)
{
#if 0
	int	retval;

	__asm__ __volatile__(			\
		"1:	lwz %0,0(%1)\n"		\
		"	eieio\n"		\
		"	li %0,0\n"		\
		"2:\n"				\
		".section .fixup,\"ax\"\n"	\
		"3:	li %0,-1\n"		\
		"	b 2b\n"			\
		".section __ex_table,\"a\"\n"	\
		"	.align 2\n"		\
		"	.long 1b,3b\n"		\
		".text"				\
		: "=r" (retval) : "r"(addr));

	return (retval);
#endif
	return 0;
}
Commit	Line	Data
945af8d7	1	/*
a47a12be	2	* linux/arch/powerpc/kernel/traps.c
945af8d7 WD	3	*
	4	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	5	*
	6	* Modified by Cort Dougan (cort@cs.nmt.edu)
	7	* and Paul Mackerras (paulus@cs.anu.edu.au)
63e73c9a	8	* fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
945af8d7 WD	9	*
	10	* (C) Copyright 2000-2003
	11	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	12	*
	13	* See file CREDITS for list of people who contributed to this
	14	* project.
	15	*
	16	* This program is free software; you can redistribute it and/or
	17	* modify it under the terms of the GNU General Public License as
	18	* published by the Free Software Foundation; either version 2 of
	19	* the License, or (at your option) any later version.
	20	*
	21	* This program is distributed in the hope that it will be useful,
	22	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	23	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	24	* GNU General Public License for more details.
	25	*
	26	* You should have received a copy of the GNU General Public License
	27	* along with this program; if not, write to the Free Software
	28	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	29	* MA 02111-1307 USA
	30	*/
	31
	32	/*
	33	* This file handles the architecture-dependent parts of hardware exceptions
	34	*/
	35
	36	#include <common.h>
	37	#include <command.h>
e39bf1e2	38	#include <kgdb.h>
945af8d7 WD	39	#include <asm/processor.h>
945af8d7 WD	40
945af8d7 WD	41	/* Returns 0 if exception not found and fixup otherwise. */
	42	extern unsigned long search_exception_table(unsigned long);
	43
	44	/* THIS NEEDS CHANGING to use the board info structure.
	45	*/
	46	#define END_OF_MEM 0x02000000
	47
	48	/*
	49	* Trap & Exception support
	50	*/
	51
20051f2a	52	static void print_backtrace(unsigned long *sp)
945af8d7 WD	53	{
	54	int cnt = 0;
	55	unsigned long i;
	56
	57	printf("Call backtrace: ");
	58	while (sp) {
	59	if ((uint)sp > END_OF_MEM)
	60	break;
	61
	62	i = sp[1];
	63	if (cnt++ % 7 == 0)
	64	printf("\n");
	65	printf("%08lX ", i);
	66	if (cnt > 32) break;
	67	sp = (unsigned long )sp;
	68	}
	69	printf("\n");
	70	}
	71
20051f2a	72	void show_regs(struct pt_regs *regs)
945af8d7 WD	73	{
	74	int i;
	75
	76	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
	77	regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
	78	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
	79	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
	80	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
	81	regs->msr&MSR_IR ? 1 : 0,
	82	regs->msr&MSR_DR ? 1 : 0);
	83
	84	printf("\n");
	85	for (i = 0; i < 32; i++) {
	86	if ((i % 8) == 0)
	87	{
	88	printf("GPR%02d: ", i);
	89	}
	90
	91	printf("%08lX ", regs->gpr[i]);
	92	if ((i % 8) == 7)
	93	{
	94	printf("\n");
	95	}
	96	}
	97	}
	98
	99
20051f2a	100	static void _exception(int signr, struct pt_regs *regs)
945af8d7 WD	101	{
	102	show_regs(regs);
	103	print_backtrace((unsigned long *)regs->gpr[1]);
	104	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
	105	}
	106
20051f2a	107	void MachineCheckException(struct pt_regs *regs)
945af8d7 WD	108	{
	109	unsigned long fixup;
	110
	111	/* Probing PCI using config cycles cause this exception
	112	* when a device is not present. Catch it and return to
	113	* the PCI exception handler.
	114	*/
	115	if ((fixup = search_exception_table(regs->nip)) != 0) {
	116	regs->nip = fixup;
	117	return;
	118	}
	119
4431283c	120	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	121	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	122	return;
	123	#endif
	124
	125	printf("Machine check in kernel mode.\n");
	126	printf("Caused by (from msr): ");
	127	printf("regs %p ",regs);
63e73c9a WD	128	/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
63e73c9a WD	129	switch( regs->msr & 0x000F0000)
945af8d7	130	{
63e73c9a	131	case (0x80000000>>12) :
945af8d7 WD	132	printf("Machine check signal - probably due to mm fault\n"
	133	"with mmu off\n");
	134	break;
63e73c9a	135	case (0x80000000>>13) :
945af8d7 WD	136	printf("Transfer error ack signal\n");
945af8d7 WD	137	break;
63e73c9a	138	case (0x80000000>>14) :
945af8d7 WD	139	printf("Data parity signal\n");
945af8d7 WD	140	break;
63e73c9a	141	case (0x80000000>>15) :
945af8d7 WD	142	printf("Address parity signal\n");
	143	break;
	144	default:
	145	printf("Unknown values in msr\n");
	146	}
	147	show_regs(regs);
	148	print_backtrace((unsigned long *)regs->gpr[1]);
	149	panic("machine check");
	150	}
	151
20051f2a	152	void AlignmentException(struct pt_regs *regs)
945af8d7	153	{
4431283c	154	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	155	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	156	return;
	157	#endif
	158	show_regs(regs);
	159	print_backtrace((unsigned long *)regs->gpr[1]);
	160	panic("Alignment Exception");
	161	}
	162
20051f2a	163	void ProgramCheckException(struct pt_regs *regs)
945af8d7	164	{
4431283c	165	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	166	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	167	return;
	168	#endif
	169	show_regs(regs);
	170	print_backtrace((unsigned long *)regs->gpr[1]);
	171	panic("Program Check Exception");
	172	}
	173
20051f2a	174	void SoftEmuException(struct pt_regs *regs)
945af8d7	175	{
4431283c	176	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	177	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	178	return;
	179	#endif
	180	show_regs(regs);
	181	print_backtrace((unsigned long *)regs->gpr[1]);
	182	panic("Software Emulation Exception");
	183	}
	184
	185
20051f2a	186	void UnknownException(struct pt_regs *regs)
945af8d7	187	{
4431283c	188	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	189	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	190	return;
	191	#endif
	192	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	193	regs->nip, regs->msr, regs->trap);
	194	_exception(0, regs);
	195	}
	196
4431283c	197	#if defined(CONFIG_CMD_BEDBUG)
945af8d7 WD	198	extern void do_bedbug_breakpoint(struct pt_regs *);
	199	#endif
	200
20051f2a	201	void DebugException(struct pt_regs *regs)
945af8d7 WD	202	{
	203
	204	printf("Debugger trap at @ %lx\n", regs->nip );
	205	show_regs(regs);
4431283c	206	#if defined(CONFIG_CMD_BEDBUG)
945af8d7 WD	207	do_bedbug_breakpoint( regs );
	208	#endif
	209	}
	210
	211	/* Probe an address by reading. If not present, return -1, otherwise
	212	* return 0.
	213	*/
20051f2a	214	int addr_probe(uint *addr)
945af8d7 WD	215	{
	216	#if 0
	217	int retval;
	218
	219	__asm__ __volatile__( \
	220	"1: lwz %0,0(%1)\n" \
	221	" eieio\n" \
	222	" li %0,0\n" \
	223	"2:\n" \
	224	".section .fixup,\"ax\"\n" \
	225	"3: li %0,-1\n" \
	226	" b 2b\n" \
	227	".section __ex_table,\"a\"\n" \
	228	" .align 2\n" \
	229	" .long 1b,3b\n" \
	230	".text" \
	231	: "=r" (retval) : "r"(addr));
	232
	233	return (retval);
	234	#endif
	235	return 0;
	236	}