[people/ms/u-boot.git] / arch / powerpc / cpu / mpc8xx / 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)
 *
 * (C) Copyright 2000
 * 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>

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

/* 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);
	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);
}

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
affae2bf	1	/*
a47a12be	2	* linux/arch/powerpc/kernel/traps.c
affae2bf 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)
	8	*
	9	* (C) Copyright 2000
	10	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	11	*
	12	* See file CREDITS for list of people who contributed to this
	13	* project.
	14	*
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License as
	17	* published by the Free Software Foundation; either version 2 of
	18	* the License, or (at your option) any later version.
	19	*
	20	* This program is distributed in the hope that it will be useful,
	21	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	23	* GNU General Public License for more details.
	24	*
	25	* You should have received a copy of the GNU General Public License
	26	* along with this program; if not, write to the Free Software
	27	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	28	* MA 02111-1307 USA
	29	*/
	30
	31	/*
	32	* This file handles the architecture-dependent parts of hardware exceptions
	33	*/
	34
	35	#include <common.h>
	36	#include <command.h>
e39bf1e2	37	#include <kgdb.h>
affae2bf WD	38	#include <asm/processor.h>
affae2bf WD	39
4431283c	40	#if defined(CONFIG_CMD_BEDBUG)
affae2bf WD	41	extern void do_bedbug_breakpoint(struct pt_regs *);
	42	#endif
	43
	44	/* Returns 0 if exception not found and fixup otherwise. */
	45	extern unsigned long search_exception_table(unsigned long);
	46
	47	/* THIS NEEDS CHANGING to use the board info structure.
	48	*/
	49	#define END_OF_MEM 0x02000000
	50
	51	/*
	52	* Trap & Exception support
	53	*/
	54
	55	void
	56	print_backtrace(unsigned long *sp)
	57	{
	58	int cnt = 0;
	59	unsigned long i;
	60
	61	printf("Call backtrace: ");
	62	while (sp) {
	63	if ((uint)sp > END_OF_MEM)
	64	break;
	65
	66	i = sp[1];
	67	if (cnt++ % 7 == 0)
	68	printf("\n");
	69	printf("%08lX ", i);
	70	if (cnt > 32) break;
	71	sp = (unsigned long )sp;
	72	}
	73	printf("\n");
	74	}
	75
	76	void show_regs(struct pt_regs * regs)
	77	{
	78	int i;
	79
	80	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
	81	regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
	82	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
	83	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
	84	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
	85	regs->msr&MSR_IR ? 1 : 0,
	86	regs->msr&MSR_DR ? 1 : 0);
	87
	88	printf("\n");
	89	for (i = 0; i < 32; i++) {
	90	if ((i % 8) == 0)
	91	{
	92	printf("GPR%02d: ", i);
	93	}
	94
	95	printf("%08lX ", regs->gpr[i]);
	96	if ((i % 8) == 7)
	97	{
	98	printf("\n");
	99	}
	100	}
	101	}
	102
	103
	104	void
105	_exception(int signr, struct pt_regs *regs)
106	{
107	show_regs(regs);
108	print_backtrace((unsigned long *)regs->gpr[1]);
109	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
110	}
111
112	void
113	MachineCheckException(struct pt_regs *regs)
114	{
115	unsigned long fixup;
116
117	/* Probing PCI using config cycles cause this exception
118	* when a device is not present. Catch it and return to
119	* the PCI exception handler.
120	*/
121	if ((fixup = search_exception_table(regs->nip)) != 0) {
122	regs->nip = fixup;
123	return;
124	}
125
4431283c	126	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	127	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	128	return;
	129	#endif
	130
	131	printf("Machine check in kernel mode.\n");
	132	printf("Caused by (from msr): ");
	133	printf("regs %p ",regs);
63e73c9a WD	134	switch( regs->msr & 0x000F0000) {
63e73c9a WD	135	case (0x80000000>>12):
affae2bf WD	136	printf("Machine check signal - probably due to mm fault\n"
	137	"with mmu off\n");
	138	break;
63e73c9a	139	case (0x80000000>>13):
affae2bf WD	140	printf("Transfer error ack signal\n");
affae2bf WD	141	break;
63e73c9a	142	case (0x80000000>>14):
affae2bf WD	143	printf("Data parity signal\n");
affae2bf WD	144	break;
63e73c9a	145	case (0x80000000>>15):
affae2bf WD	146	printf("Address parity signal\n");
	147	break;
	148	default:
	149	printf("Unknown values in msr\n");
	150	}
	151	show_regs(regs);
	152	print_backtrace((unsigned long *)regs->gpr[1]);
	153	panic("machine check");
	154	}
	155
	156	void
	157	AlignmentException(struct pt_regs *regs)
	158	{
4431283c	159	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	160	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	161	return;
	162	#endif
	163	show_regs(regs);
	164	print_backtrace((unsigned long *)regs->gpr[1]);
	165	panic("Alignment Exception");
	166	}
	167
	168	void
	169	ProgramCheckException(struct pt_regs *regs)
	170	{
4431283c	171	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	172	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	173	return;
	174	#endif
	175	show_regs(regs);
	176	print_backtrace((unsigned long *)regs->gpr[1]);
	177	panic("Program Check Exception");
	178	}
	179
	180	void
	181	SoftEmuException(struct pt_regs *regs)
	182	{
4431283c	183	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	184	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	185	return;
	186	#endif
	187	show_regs(regs);
	188	print_backtrace((unsigned long *)regs->gpr[1]);
	189	panic("Software Emulation Exception");
	190	}
	191
	192
	193	void
	194	UnknownException(struct pt_regs *regs)
	195	{
4431283c	196	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	197	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	198	return;
	199	#endif
	200	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	201	regs->nip, regs->msr, regs->trap);
	202	_exception(0, regs);
	203	}
	204
	205	void
	206	DebugException(struct pt_regs *regs)
	207	{
	208	printf("Debugger trap at @ %lx\n", regs->nip );
	209	show_regs(regs);
4431283c	210	#if defined(CONFIG_CMD_BEDBUG)
affae2bf WD	211	do_bedbug_breakpoint( regs );
	212	#endif
	213	}
	214
	215	/* Probe an address by reading. If not present, return -1, otherwise
	216	* return 0.
	217	*/
	218	int
	219	addr_probe(uint *addr)
	220	{
	221	#if 0
	222	int retval;
	223
	224	__asm__ __volatile__( \
	225	"1: lwz %0,0(%1)\n" \
	226	" eieio\n" \
	227	" li %0,0\n" \
	228	"2:\n" \
	229	".section .fixup,\"ax\"\n" \
	230	"3: li %0,-1\n" \
	231	" b 2b\n" \
	232	".section __ex_table,\"a\"\n" \
	233	" .align 2\n" \
	234	" .long 1b,3b\n" \
	235	".text" \
	236	: "=r" (retval) : "r"(addr));
	237
	238	return (retval);
	239	#endif
	240	return 0;
	241	}