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				/*				 * 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 				#include 				#include 								#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	0x0001000												/*				 * Print stack backtrace				 */				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");				}								/*				 * Print current registers				 */				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");						}					}				}												/*				 * General exception handler routine				 */				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);				}								/*				 * Machine check exception handler routine				 */				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\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");				}								/*				 * Alignment exception handler routine				 */				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");				}								/*				 * Program check exception handler routine				 */				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");				}								/*				 * Software emulation exception handler routine				 */				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");				}												/*				 * Unknown exception handler routine				 */				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);				}								/*				 * Debug exception handler routine				 */				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				}							

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