[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
 */

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");
		}
	}
}


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
	52	void
	53	print_backtrace(unsigned long *sp)
	54	{
	55	int cnt = 0;
	56	unsigned long i;
	57
	58	printf("Call backtrace: ");
	59	while (sp) {
	60	if ((uint)sp > END_OF_MEM)
	61	break;
	62
	63	i = sp[1];
	64	if (cnt++ % 7 == 0)
	65	printf("\n");
	66	printf("%08lX ", i);
	67	if (cnt > 32) break;
	68	sp = (unsigned long )sp;
	69	}
	70	printf("\n");
	71	}
	72
	73	void show_regs(struct pt_regs * regs)
	74	{
	75	int i;
	76
	77	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
	78	regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
	79	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
	80	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
	81	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
	82	regs->msr&MSR_IR ? 1 : 0,
	83	regs->msr&MSR_DR ? 1 : 0);
	84
	85	printf("\n");
	86	for (i = 0; i < 32; i++) {
	87	if ((i % 8) == 0)
	88	{
	89	printf("GPR%02d: ", i);
	90	}
	91
	92	printf("%08lX ", regs->gpr[i]);
	93	if ((i % 8) == 7)
	94	{
	95	printf("\n");
	96	}
	97	}
	98	}
	99
	100
	101	void
	102	_exception(int signr, struct pt_regs *regs)
	103	{
	104	show_regs(regs);
105	print_backtrace((unsigned long *)regs->gpr[1]);
106	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
107	}
108
109	void
110	MachineCheckException(struct pt_regs *regs)
111	{
112	unsigned long fixup;
113
114	/* Probing PCI using config cycles cause this exception
115	* when a device is not present. Catch it and return to
116	* the PCI exception handler.
117	*/
118	if ((fixup = search_exception_table(regs->nip)) != 0) {
119	regs->nip = fixup;
120	return;
121	}
122
4431283c	123	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	124	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	125	return;
	126	#endif
	127
	128	printf("Machine check in kernel mode.\n");
	129	printf("Caused by (from msr): ");
	130	printf("regs %p ",regs);
63e73c9a WD	131	/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
63e73c9a WD	132	switch( regs->msr & 0x000F0000)
945af8d7	133	{
63e73c9a	134	case (0x80000000>>12) :
945af8d7 WD	135	printf("Machine check signal - probably due to mm fault\n"
	136	"with mmu off\n");
	137	break;
63e73c9a	138	case (0x80000000>>13) :
945af8d7 WD	139	printf("Transfer error ack signal\n");
945af8d7 WD	140	break;
63e73c9a	141	case (0x80000000>>14) :
945af8d7 WD	142	printf("Data parity signal\n");
945af8d7 WD	143	break;
63e73c9a	144	case (0x80000000>>15) :
945af8d7 WD	145	printf("Address parity signal\n");
	146	break;
	147	default:
	148	printf("Unknown values in msr\n");
	149	}
	150	show_regs(regs);
	151	print_backtrace((unsigned long *)regs->gpr[1]);
	152	panic("machine check");
	153	}
	154
	155	void
	156	AlignmentException(struct pt_regs *regs)
	157	{
4431283c	158	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	159	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	160	return;
	161	#endif
	162	show_regs(regs);
	163	print_backtrace((unsigned long *)regs->gpr[1]);
	164	panic("Alignment Exception");
	165	}
	166
	167	void
	168	ProgramCheckException(struct pt_regs *regs)
	169	{
4431283c	170	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	171	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	172	return;
	173	#endif
	174	show_regs(regs);
	175	print_backtrace((unsigned long *)regs->gpr[1]);
	176	panic("Program Check Exception");
	177	}
	178
	179	void
	180	SoftEmuException(struct pt_regs *regs)
	181	{
4431283c	182	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	183	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	184	return;
	185	#endif
	186	show_regs(regs);
	187	print_backtrace((unsigned long *)regs->gpr[1]);
	188	panic("Software Emulation Exception");
	189	}
	190
	191
	192	void
	193	UnknownException(struct pt_regs *regs)
	194	{
4431283c	195	#if defined(CONFIG_CMD_KGDB)
945af8d7 WD	196	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	197	return;
	198	#endif
	199	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	200	regs->nip, regs->msr, regs->trap);
	201	_exception(0, regs);
	202	}
	203
4431283c	204	#if defined(CONFIG_CMD_BEDBUG)
945af8d7 WD	205	extern void do_bedbug_breakpoint(struct pt_regs *);
	206	#endif
	207
	208	void
	209	DebugException(struct pt_regs *regs)
	210	{
	211
	212	printf("Debugger trap at @ %lx\n", regs->nip );
	213	show_regs(regs);
4431283c	214	#if defined(CONFIG_CMD_BEDBUG)
945af8d7 WD	215	do_bedbug_breakpoint( regs );
	216	#endif
	217	}
	218
	219	/* Probe an address by reading. If not present, return -1, otherwise
	220	* return 0.
	221	*/
	222	int
	223	addr_probe(uint *addr)
	224	{
	225	#if 0
	226	int retval;
	227
	228	__asm__ __volatile__( \
	229	"1: lwz %0,0(%1)\n" \
	230	" eieio\n" \
	231	" li %0,0\n" \
	232	"2:\n" \
	233	".section .fixup,\"ax\"\n" \
	234	"3: li %0,-1\n" \
	235	" b 2b\n" \
	236	".section __ex_table,\"a\"\n" \
	237	" .align 2\n" \
	238	" .long 1b,3b\n" \
	239	".text" \
	240	: "=r" (retval) : "r"(addr));
	241
	242	return (retval);
	243	#endif
	244	return 0;
	245	}