[people/ms/u-boot.git] / cpu / mpc8260 / traps.c

/*
 * linux/arch/ppc/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 <asm/processor.h>
#include <asm/m8260_pci.h>

#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
int (*debugger_exception_handler)(struct pt_regs *) = 0;
#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);
}

#ifdef CONFIG_PCI
void dump_pci (void)
{

	volatile immap_t *immap = (immap_t *) CFG_IMMR;

	printf ("PCI: err status %x err mask %x err ctrl %x\n",
		le32_to_cpu (immap->im_pci.pci_esr),
		le32_to_cpu (immap->im_pci.pci_emr),
		le32_to_cpu (immap->im_pci.pci_ecr));
	printf ("     error address %x error data %x ctrl %x\n",
		le32_to_cpu (immap->im_pci.pci_eacr),
		le32_to_cpu (immap->im_pci.pci_edcr),
		le32_to_cpu (immap->im_pci.pci_eccr));

}
#endif

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.
	 */
#ifdef CONFIG_PCI
	volatile immap_t *immap  = (immap_t *)CFG_IMMR;
#ifdef DEBUG
	dump_pci();
#endif
	/* clear the error in the error status register */
	if(immap->im_pci.pci_esr && cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
		immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
		return;
	}
#endif
	if ((fixup = search_exception_table(regs->nip)) != 0) {
		regs->nip = fixup;
		return;
	}

#if (CONFIG_COMMANDS & CFG_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]);
#ifdef CONFIG_PCI
	dump_pci();
#endif
	panic("machine check");
}

void
AlignmentException(struct pt_regs *regs)
{
#if (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 WD	1	/*
	2	* linux/arch/ppc/kernel/traps.c
	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>
	37	#include <asm/processor.h>
3c74e32a	38	#include <asm/m8260_pci.h>
affae2bf WD	39
	40	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	41	int (debugger_exception_handler)(struct pt_regs ) = 0;
	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++) {
3c74e32a	90	if ((i % 8) == 0) {
affae2bf WD	91	printf("GPR%02d: ", i);
	92	}
	93
	94	printf("%08lX ", regs->gpr[i]);
3c74e32a	95	if ((i % 8) == 7) {
affae2bf WD	96	printf("\n");
	97	}
	98	}
	99	}
	100
	101
	102	void
	103	_exception(int signr, struct pt_regs *regs)
	104	{
	105	show_regs(regs);
	106	print_backtrace((unsigned long *)regs->gpr[1]);
	107	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
	108	}
	109
3c74e32a WD	110	#ifdef CONFIG_PCI
	111	void dump_pci (void)
	112	{
	113
	114	volatile immap_t immap = (immap_t ) CFG_IMMR;
	115
	116	printf ("PCI: err status %x err mask %x err ctrl %x\n",
	117	le32_to_cpu (immap->im_pci.pci_esr),
	118	le32_to_cpu (immap->im_pci.pci_emr),
	119	le32_to_cpu (immap->im_pci.pci_ecr));
	120	printf (" error address %x error data %x ctrl %x\n",
	121	le32_to_cpu (immap->im_pci.pci_eacr),
	122	le32_to_cpu (immap->im_pci.pci_edcr),
	123	le32_to_cpu (immap->im_pci.pci_eccr));
	124
	125	}
	126	#endif
	127
affae2bf WD	128	void
	129	MachineCheckException(struct pt_regs *regs)
	130	{
	131	unsigned long fixup;
	132
	133	/* Probing PCI using config cycles cause this exception
	134	* when a device is not present. Catch it and return to
	135	* the PCI exception handler.
	136	*/
3c74e32a WD	137	#ifdef CONFIG_PCI
	138	volatile immap_t immap = (immap_t )CFG_IMMR;
	139	#ifdef DEBUG
	140	dump_pci();
	141	#endif
	142	/* clear the error in the error status register */
	143	if(immap->im_pci.pci_esr && cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
	144	immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
	145	return;
	146	}
	147	#endif
affae2bf WD	148	if ((fixup = search_exception_table(regs->nip)) != 0) {
	149	regs->nip = fixup;
	150	return;
	151	}
	152
	153	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	154	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	155	return;
	156	#endif
	157
	158	printf("Machine check in kernel mode.\n");
	159	printf("Caused by (from msr): ");
	160	printf("regs %p ",regs);
63e73c9a WD	161	switch( regs->msr & 0x000F0000) {
63e73c9a WD	162	case (0x80000000>>12):
affae2bf WD	163	printf("Machine check signal - probably due to mm fault\n"
	164	"with mmu off\n");
	165	break;
63e73c9a	166	case (0x80000000>>13):
affae2bf WD	167	printf("Transfer error ack signal\n");
affae2bf WD	168	break;
63e73c9a	169	case (0x80000000>>14):
affae2bf WD	170	printf("Data parity signal\n");
affae2bf WD	171	break;
63e73c9a	172	case (0x80000000>>15):
affae2bf WD	173	printf("Address parity signal\n");
	174	break;
	175	default:
	176	printf("Unknown values in msr\n");
	177	}
	178	show_regs(regs);
	179	print_backtrace((unsigned long *)regs->gpr[1]);
3c74e32a WD	180	#ifdef CONFIG_PCI
	181	dump_pci();
	182	#endif
affae2bf WD	183	panic("machine check");
	184	}
	185
	186	void
	187	AlignmentException(struct pt_regs *regs)
	188	{
	189	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	190	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	191	return;
	192	#endif
	193	show_regs(regs);
	194	print_backtrace((unsigned long *)regs->gpr[1]);
	195	panic("Alignment Exception");
	196	}
	197
	198	void
	199	ProgramCheckException(struct pt_regs *regs)
	200	{
	201	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	202	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	203	return;
	204	#endif
	205	show_regs(regs);
	206	print_backtrace((unsigned long *)regs->gpr[1]);
	207	panic("Program Check Exception");
	208	}
	209
	210	void
	211	SoftEmuException(struct pt_regs *regs)
	212	{
	213	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	214	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	215	return;
	216	#endif
	217	show_regs(regs);
	218	print_backtrace((unsigned long *)regs->gpr[1]);
	219	panic("Software Emulation Exception");
	220	}
	221
	222
	223	void
	224	UnknownException(struct pt_regs *regs)
	225	{
	226	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	227	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	228	return;
	229	#endif
	230	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	231	regs->nip, regs->msr, regs->trap);
	232	_exception(0, regs);
	233	}
	234
	235	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
	236	extern void do_bedbug_breakpoint(struct pt_regs *);
	237	#endif
	238
	239	void
	240	DebugException(struct pt_regs *regs)
	241	{
	242
	243	printf("Debugger trap at @ %lx\n", regs->nip );
	244	show_regs(regs);
	245	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
	246	do_bedbug_breakpoint( regs );
247	#endif
248	}
249
250	/* Probe an address by reading. If not present, return -1, otherwise
251	* return 0.
252	*/
253	int
254	addr_probe(uint *addr)
255	{
256	#if 0
257	int retval;
258
259	__asm__ __volatile__( \
260	"1: lwz %0,0(%1)\n" \
261	" eieio\n" \
262	" li %0,0\n" \
263	"2:\n" \
264	".section .fixup,\"ax\"\n" \
265	"3: li %0,-1\n" \
266	" b 2b\n" \
267	".section __ex_table,\"a\"\n" \
268	" .align 2\n" \
269	" .long 1b,3b\n" \
270	".text" \
271	: "=r" (retval) : "r"(addr));
272
273	return (retval);
274	#endif
275	return 0;
276	}