[people/ms/u-boot.git] / arch / powerpc / cpu / mpc8260 / 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>
#include <asm/m8260_pci.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;

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

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

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

		printf("%08lX ", regs->gpr[i]);
		if ((i % 8) == 7) {
			putc ('\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 *) CONFIG_SYS_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 *)CONFIG_SYS_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 defined(CONFIG_CMD_KGDB)
	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
		return;
#endif

	puts ("Machine check in kernel mode.\n"
		"Caused by (from msr): ");
	printf("regs %p ",regs);
	switch( regs->msr & 0x000F0000) {
	case (0x80000000>>12):
		puts ("Machine check signal - probably due to mm fault\n"
			"with mmu off\n");
		break;
	case (0x80000000>>13):
		puts ("Transfer error ack signal\n");
		break;
	case (0x80000000>>14):
		puts ("Data parity signal\n");
		break;
	case (0x80000000>>15):
		puts ("Address parity signal\n");
		break;
	default:
		puts ("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 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
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	38	#include <asm/processor.h>
3c74e32a	39	#include <asm/m8260_pci.h>
affae2bf	40
affae2bf 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
4b9206ed	58	puts ("Call backtrace: ");
affae2bf WD	59	while (sp) {
	60	if ((uint)sp > END_OF_MEM)
	61	break;
	62
	63	i = sp[1];
	64	if (cnt++ % 7 == 0)
4b9206ed	65	putc ('\n');
affae2bf WD	66	printf("%08lX ", i);
	67	if (cnt > 32) break;
	68	sp = (unsigned long )sp;
	69	}
4b9206ed	70	putc ('\n');
affae2bf WD	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
4b9206ed	85	putc ('\n');
affae2bf	86	for (i = 0; i < 32; i++) {
3c74e32a	87	if ((i % 8) == 0) {
affae2bf WD	88	printf("GPR%02d: ", i);
	89	}
	90
	91	printf("%08lX ", regs->gpr[i]);
3c74e32a	92	if ((i % 8) == 7) {
4b9206ed	93	putc ('\n');
affae2bf WD	94	}
	95	}
	96	}
	97
	98
	99	void
	100	_exception(int signr, struct pt_regs *regs)
	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
3c74e32a WD	107	#ifdef CONFIG_PCI
	108	void dump_pci (void)
	109	{
	110
6d0f6bcf	111	volatile immap_t immap = (immap_t ) CONFIG_SYS_IMMR;
3c74e32a WD	112
	113	printf ("PCI: err status %x err mask %x err ctrl %x\n",
	114	le32_to_cpu (immap->im_pci.pci_esr),
	115	le32_to_cpu (immap->im_pci.pci_emr),
	116	le32_to_cpu (immap->im_pci.pci_ecr));
	117	printf (" error address %x error data %x ctrl %x\n",
	118	le32_to_cpu (immap->im_pci.pci_eacr),
	119	le32_to_cpu (immap->im_pci.pci_edcr),
	120	le32_to_cpu (immap->im_pci.pci_eccr));
	121
	122	}
	123	#endif
	124
affae2bf WD	125	void
	126	MachineCheckException(struct pt_regs *regs)
	127	{
	128	unsigned long fixup;
	129
	130	/* Probing PCI using config cycles cause this exception
	131	* when a device is not present. Catch it and return to
	132	* the PCI exception handler.
	133	*/
3c74e32a	134	#ifdef CONFIG_PCI
6d0f6bcf	135	volatile immap_t immap = (immap_t )CONFIG_SYS_IMMR;
3c74e32a WD	136	#ifdef DEBUG
	137	dump_pci();
	138	#endif
	139	/* clear the error in the error status register */
6fb6af6d	140	if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
3c74e32a WD	141	immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
	142	return;
	143	}
	144	#endif
affae2bf WD	145	if ((fixup = search_exception_table(regs->nip)) != 0) {
	146	regs->nip = fixup;
	147	return;
	148	}
	149
4431283c	150	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	151	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	152	return;
	153	#endif
	154
4b9206ed WD	155	puts ("Machine check in kernel mode.\n"
4b9206ed WD	156	"Caused by (from msr): ");
affae2bf	157	printf("regs %p ",regs);
63e73c9a WD	158	switch( regs->msr & 0x000F0000) {
63e73c9a WD	159	case (0x80000000>>12):
4b9206ed	160	puts ("Machine check signal - probably due to mm fault\n"
affae2bf WD	161	"with mmu off\n");
affae2bf WD	162	break;
63e73c9a	163	case (0x80000000>>13):
4b9206ed	164	puts ("Transfer error ack signal\n");
affae2bf	165	break;
63e73c9a	166	case (0x80000000>>14):
4b9206ed	167	puts ("Data parity signal\n");
affae2bf	168	break;
63e73c9a	169	case (0x80000000>>15):
4b9206ed	170	puts ("Address parity signal\n");
affae2bf WD	171	break;
affae2bf WD	172	default:
4b9206ed	173	puts ("Unknown values in msr\n");
affae2bf WD	174	}
	175	show_regs(regs);
	176	print_backtrace((unsigned long *)regs->gpr[1]);
3c74e32a WD	177	#ifdef CONFIG_PCI
	178	dump_pci();
	179	#endif
affae2bf WD	180	panic("machine check");
	181	}
	182
	183	void
	184	AlignmentException(struct pt_regs *regs)
	185	{
4431283c	186	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	187	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	188	return;
	189	#endif
	190	show_regs(regs);
	191	print_backtrace((unsigned long *)regs->gpr[1]);
	192	panic("Alignment Exception");
	193	}
	194
	195	void
	196	ProgramCheckException(struct pt_regs *regs)
	197	{
4431283c	198	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	199	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	200	return;
	201	#endif
	202	show_regs(regs);
	203	print_backtrace((unsigned long *)regs->gpr[1]);
	204	panic("Program Check Exception");
	205	}
	206
	207	void
	208	SoftEmuException(struct pt_regs *regs)
	209	{
4431283c	210	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	211	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	212	return;
	213	#endif
	214	show_regs(regs);
	215	print_backtrace((unsigned long *)regs->gpr[1]);
	216	panic("Software Emulation Exception");
	217	}
	218
	219
	220	void
	221	UnknownException(struct pt_regs *regs)
	222	{
4431283c	223	#if defined(CONFIG_CMD_KGDB)
affae2bf WD	224	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	225	return;
	226	#endif
	227	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	228	regs->nip, regs->msr, regs->trap);
	229	_exception(0, regs);
	230	}
	231
4431283c	232	#if defined(CONFIG_CMD_BEDBUG)
affae2bf WD	233	extern void do_bedbug_breakpoint(struct pt_regs *);
	234	#endif
	235
	236	void
	237	DebugException(struct pt_regs *regs)
	238	{
	239
	240	printf("Debugger trap at @ %lx\n", regs->nip );
	241	show_regs(regs);
4431283c	242	#if defined(CONFIG_CMD_BEDBUG)
affae2bf WD	243	do_bedbug_breakpoint( regs );
	244	#endif
	245	}
	246
	247	/* Probe an address by reading. If not present, return -1, otherwise
	248	* return 0.
	249	*/
	250	int
	251	addr_probe(uint *addr)
	252	{
	253	#if 0
	254	int retval;
	255
	256	__asm__ __volatile__( \
	257	"1: lwz %0,0(%1)\n" \
	258	" eieio\n" \
	259	" li %0,0\n" \
	260	"2:\n" \
	261	".section .fixup,\"ax\"\n" \
	262	"3: li %0,-1\n" \
	263	" b 2b\n" \
	264	".section __ex_table,\"a\"\n" \
	265	" .align 2\n" \
	266	" .long 1b,3b\n" \
	267	".text" \
	268	: "=r" (retval) : "r"(addr));
	269
	270	return (retval);
	271	#endif
	272	return 0;
	273	}