[people/ms/u-boot.git] / cpu / mpc8xx / 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>

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

#if (CONFIG_COMMANDS & CFG_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 (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]);
	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);
}

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>
	38
	39	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	40	int (debugger_exception_handler)(struct pt_regs ) = 0;
	41	#endif
	42
	43	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
	44	extern void do_bedbug_breakpoint(struct pt_regs *);
	45	#endif
	46
	47	/* Returns 0 if exception not found and fixup otherwise. */
	48	extern unsigned long search_exception_table(unsigned long);
	49
	50	/* THIS NEEDS CHANGING to use the board info structure.
	51	*/
	52	#define END_OF_MEM 0x02000000
	53
	54	/*
	55	* Trap & Exception support
	56	*/
	57
	58	void
	59	print_backtrace(unsigned long *sp)
	60	{
	61	int cnt = 0;
	62	unsigned long i;
	63
	64	printf("Call backtrace: ");
65	while (sp) {
66	if ((uint)sp > END_OF_MEM)
67	break;
68
69	i = sp[1];
70	if (cnt++ % 7 == 0)
71	printf("\n");
72	printf("%08lX ", i);
73	if (cnt > 32) break;
74	sp = (unsigned long )sp;
75	}
76	printf("\n");
77	}
78
79	void show_regs(struct pt_regs * regs)
80	{
81	int i;
82
83	printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
84	regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
85	printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
86	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
87	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
88	regs->msr&MSR_IR ? 1 : 0,
89	regs->msr&MSR_DR ? 1 : 0);
90
91	printf("\n");
92	for (i = 0; i < 32; i++) {
93	if ((i % 8) == 0)
94	{
95	printf("GPR%02d: ", i);
96	}
97
98	printf("%08lX ", regs->gpr[i]);
99	if ((i % 8) == 7)
100	{
101	printf("\n");
102	}
103	}
104	}
105
106
107	void
108	_exception(int signr, struct pt_regs *regs)
109	{
110	show_regs(regs);
111	print_backtrace((unsigned long *)regs->gpr[1]);
112	panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
113	}
114
115	void
116	MachineCheckException(struct pt_regs *regs)
117	{
118	unsigned long fixup;
119
120	/* Probing PCI using config cycles cause this exception
121	* when a device is not present. Catch it and return to
122	* the PCI exception handler.
123	*/
124	if ((fixup = search_exception_table(regs->nip)) != 0) {
125	regs->nip = fixup;
126	return;
127	}
128
129	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
130	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
131	return;
132	#endif
133
134	printf("Machine check in kernel mode.\n");
135	printf("Caused by (from msr): ");
136	printf("regs %p ",regs);
63e73c9a WD	137	switch( regs->msr & 0x000F0000) {
63e73c9a WD	138	case (0x80000000>>12):
affae2bf WD	139	printf("Machine check signal - probably due to mm fault\n"
	140	"with mmu off\n");
	141	break;
63e73c9a	142	case (0x80000000>>13):
affae2bf WD	143	printf("Transfer error ack signal\n");
affae2bf WD	144	break;
63e73c9a	145	case (0x80000000>>14):
affae2bf WD	146	printf("Data parity signal\n");
affae2bf WD	147	break;
63e73c9a	148	case (0x80000000>>15):
affae2bf WD	149	printf("Address parity signal\n");
	150	break;
	151	default:
	152	printf("Unknown values in msr\n");
	153	}
	154	show_regs(regs);
	155	print_backtrace((unsigned long *)regs->gpr[1]);
	156	panic("machine check");
	157	}
	158
	159	void
	160	AlignmentException(struct pt_regs *regs)
	161	{
	162	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	163	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	164	return;
	165	#endif
	166	show_regs(regs);
	167	print_backtrace((unsigned long *)regs->gpr[1]);
	168	panic("Alignment Exception");
	169	}
	170
	171	void
	172	ProgramCheckException(struct pt_regs *regs)
	173	{
	174	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	175	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	176	return;
	177	#endif
	178	show_regs(regs);
	179	print_backtrace((unsigned long *)regs->gpr[1]);
	180	panic("Program Check Exception");
	181	}
	182
	183	void
	184	SoftEmuException(struct pt_regs *regs)
	185	{
	186	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	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("Software Emulation Exception");
	193	}
	194
	195
	196	void
	197	UnknownException(struct pt_regs *regs)
	198	{
	199	#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
	200	if (debugger_exception_handler && (*debugger_exception_handler)(regs))
	201	return;
	202	#endif
	203	printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
	204	regs->nip, regs->msr, regs->trap);
	205	_exception(0, regs);
	206	}
	207
	208	void
	209	DebugException(struct pt_regs *regs)
	210	{
	211	printf("Debugger trap at @ %lx\n", regs->nip );
	212	show_regs(regs);
213	#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
214	do_bedbug_breakpoint( regs );
215	#endif
216	}
217
218	/* Probe an address by reading. If not present, return -1, otherwise
219	* return 0.
220	*/
221	int
222	addr_probe(uint *addr)
223	{
224	#if 0
225	int retval;
226
227	__asm__ __volatile__( \
228	"1: lwz %0,0(%1)\n" \
229	" eieio\n" \
230	" li %0,0\n" \
231	"2:\n" \
232	".section .fixup,\"ax\"\n" \
233	"3: li %0,-1\n" \
234	" b 2b\n" \
235	".section __ex_table,\"a\"\n" \
236	" .align 2\n" \
237	" .long 1b,3b\n" \
238	".text" \
239	: "=r" (retval) : "r"(addr));
240
241	return (retval);
242	#endif
243	return 0;
244	}