[people/ms/u-boot.git] / cpu / mpc83xx / traps.c

/*
 * linux/arch/ppc/kernel/traps.c
 *
 * 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
 *
 * Change log:
 *
 * 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.
 *
 * 20050101: Eran Liberty (liberty@freescale.com)
 *           Initial file creating (porting from 85XX & 8260)
 */

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

#include <common.h>
#include <command.h>
#include <asm/processor.h>
#include <asm/mpc8349_pci.h>

DECLARE_GLOBAL_DATA_PTR;

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

#define END_OF_MEM	(gd->bd->bi_memstart + gd->bd->bi_memsize)

/*
 * 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 *) 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
#if 0
	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
#endif /* CONFIG_PCI */
	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

	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 (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
f046ccd1 EL	1	/*
	2	* linux/arch/ppc/kernel/traps.c
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation; either version 2 of
	7	* the License, or (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	17	* MA 02111-1307 USA
	18	*
	19	* Change log:
	20	*
	21	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	22	*
	23	* Modified by Cort Dougan (cort@cs.nmt.edu)
	24	* and Paul Mackerras (paulus@cs.anu.edu.au)
	25	*
	26	* (C) Copyright 2000
	27	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	28	*
	29	* 20050101: Eran Liberty (liberty@freescale.com)
	30	* Initial file creating (porting from 85XX & 8260)
	31	*/
	32
	33	/*
	34	* This file handles the architecture-dependent parts of hardware
	35	* exceptions
	36	*/
	37
	38	#include <common.h>
	39	#include <command.h>
	40	#include <asm/processor.h>
	41	#include <asm/mpc8349_pci.h>
	42
d87080b7 WD	43	DECLARE_GLOBAL_DATA_PTR;
d87080b7 WD	44
f046ccd1 EL	45	/* Returns 0 if exception not found and fixup otherwise. */
	46	extern unsigned long search_exception_table(unsigned long);
	47
	48	#define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
	49
	50	/*
	51	* Trap & Exception support
	52	*/
	53
	54	void
	55	print_backtrace(unsigned long *sp)
	56	{
f046ccd1 EL	57	int cnt = 0;
	58	unsigned long i;
	59
	60	puts ("Call backtrace: ");
	61	while (sp) {
	62	if ((uint)sp > END_OF_MEM)
	63	break;
	64
	65	i = sp[1];
	66	if (cnt++ % 7 == 0)
	67	putc ('\n');
	68	printf("%08lX ", i);
	69	if (cnt > 32) break;
	70	sp = (unsigned long )sp;
	71	}
	72	putc ('\n');
	73	}
	74
	75	void show_regs(struct pt_regs * regs)
	76	{
	77	int i;
	78
	79	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
	80	regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
	81	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
	82	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
	83	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
	84	regs->msr&MSR_IR ? 1 : 0,
	85	regs->msr&MSR_DR ? 1 : 0);
	86
	87	putc ('\n');
	88	for (i = 0; i < 32; i++) {
	89	if ((i % 8) == 0) {
	90	printf("GPR%02d: ", i);
	91	}
	92
	93	printf("%08lX ", regs->gpr[i]);
	94	if ((i % 8) == 7) {
	95	putc ('\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	#ifdef CONFIG_PCI
	110	void dump_pci (void)
	111	{
	112	/*
	113	volatile immap_t immap = (immap_t ) CFG_IMMR;
	114	printf ("PCI: err status %x err mask %x err ctrl %x\n",
	115	le32_to_cpu (immap->im_pci.pci_esr),
	116	le32_to_cpu (immap->im_pci.pci_emr),
	117	le32_to_cpu (immap->im_pci.pci_ecr));
	118	printf (" error address %x error data %x ctrl %x\n",
	119	le32_to_cpu (immap->im_pci.pci_eacr),
	120	le32_to_cpu (immap->im_pci.pci_edcr),
121	le32_to_cpu (immap->im_pci.pci_eccr));
122	*/
123	}
124	#endif
125
126	void
127	MachineCheckException(struct pt_regs *regs)
128	{
129	unsigned long fixup;
130
131	/* Probing PCI using config cycles cause this exception
132	* when a device is not present. Catch it and return to
133	* the PCI exception handler.
134	*/
135	#ifdef CONFIG_PCI
136	#if 0
137	volatile immap_t immap = (immap_t )CFG_IMMR;
138	#ifdef DEBUG
139	dump_pci();
140	#endif
141	/* clear the error in the error status register */
142	if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
143	immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
144	return;
145	}
146	#endif
147	#endif /* CONFIG_PCI */
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	puts ("Machine check in kernel mode.\n"
159	"Caused by (from msr): ");
160	printf("regs %p ",regs);
161	switch( regs->msr & 0x000F0000) {
162	case (0x80000000>>12):
163	puts ("Machine check signal - probably due to mm fault\n"
164	"with mmu off\n");
165	break;
166	case (0x80000000>>13):
167	puts ("Transfer error ack signal\n");
168	break;
169	case (0x80000000>>14):
170	puts ("Data parity signal\n");
171	break;
172	case (0x80000000>>15):
173	puts ("Address parity signal\n");
174	break;
175	default:
176	puts ("Unknown values in msr\n");
177	}
178	show_regs(regs);
179	print_backtrace((unsigned long *)regs->gpr[1]);
180	#ifdef CONFIG_PCI
181	dump_pci();
182	#endif
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	printf("Debugger trap at @ %lx\n", regs->nip );
243	show_regs(regs);
244	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
245	do_bedbug_breakpoint( regs );
246	#endif
247	}
248
249	/* Probe an address by reading. If not present, return -1, otherwise
250	* return 0.
251	*/
252	int
253	addr_probe(uint *addr)
254	{
255	#if 0
256	int retval;
257
258	__asm__ __volatile__( \
259	"1: lwz %0,0(%1)\n" \
260	" eieio\n" \
261	" li %0,0\n" \
262	"2:\n" \
263	".section .fixup,\"ax\"\n" \
264	"3: li %0,-1\n" \
265	" b 2b\n" \
266	".section __ex_table,\"a\"\n" \
267	" .align 2\n" \
268	" .long 1b,3b\n" \
269	".text" \
270	: "=r" (retval) : "r"(addr));
271
272	return (retval);
273	#endif
274	return 0;
275	}