2 * linux/arch/powerpc/kernel/traps.c
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 * See file CREDITS for list of people who contributed to this
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.
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.
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,
32 * This file handles the architecture-dependent parts of hardware exceptions
38 #include <asm/processor.h>
40 #if defined(CONFIG_CMD_BEDBUG)
41 extern void do_bedbug_breakpoint(struct pt_regs *);
44 /* Returns 0 if exception not found and fixup otherwise. */
45 extern unsigned long search_exception_table(unsigned long);
47 /* THIS NEEDS CHANGING to use the board info structure.
49 #define END_OF_MEM 0x0001000
53 * Print stack backtrace
55 void print_backtrace(unsigned long *sp)
60 printf("Call backtrace: ");
62 if ((uint)sp > END_OF_MEM)
70 sp = (unsigned long *)*sp;
76 * Print current registers
78 void show_regs(struct pt_regs * regs)
81 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
82 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
83 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
84 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
85 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
86 regs->msr&MSR_IR ? 1 : 0,
87 regs->msr&MSR_DR ? 1 : 0);
90 for (i = 0; i < 32; i++) {
93 printf("GPR%02d: ", i);
96 printf("%08lX ", regs->gpr[i]);
106 * General exception handler routine
108 void _exception(int signr, struct pt_regs *regs)
111 print_backtrace((unsigned long *)regs->gpr[1]);
112 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
116 * Machine check exception handler routine
118 void MachineCheckException(struct pt_regs *regs)
122 /* Probing PCI using config cycles cause this exception
123 * when a device is not present. Catch it and return to
124 * the PCI exception handler.
126 if ((fixup = search_exception_table(regs->nip)) != 0) {
131 #if defined(CONFIG_CMD_KGDB)
132 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
136 printf("Machine check in kernel mode.\n");
137 printf("Caused by (from msr): ");
138 printf("regs %p ",regs);
139 switch( regs->msr & 0x000F0000) {
140 case (0x80000000>>12):
141 printf("Machine check signal\n");
143 case (0x80000000>>13):
144 printf("Transfer error ack signal\n");
146 case (0x80000000>>14):
147 printf("Data parity signal\n");
149 case (0x80000000>>15):
150 printf("Address parity signal\n");
153 printf("Unknown values in msr\n");
156 print_backtrace((unsigned long *)regs->gpr[1]);
157 panic("machine check");
161 * Alignment exception handler routine
163 void AlignmentException(struct pt_regs *regs)
165 #if defined(CONFIG_CMD_KGDB)
166 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
170 print_backtrace((unsigned long *)regs->gpr[1]);
171 panic("Alignment Exception");
175 * Program check exception handler routine
177 void ProgramCheckException(struct pt_regs *regs)
179 #if defined(CONFIG_CMD_KGDB)
180 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
184 print_backtrace((unsigned long *)regs->gpr[1]);
185 panic("Program Check Exception");
189 * Software emulation exception handler routine
191 void SoftEmuException(struct pt_regs *regs)
193 #if defined(CONFIG_CMD_KGDB)
194 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
198 print_backtrace((unsigned long *)regs->gpr[1]);
199 panic("Software Emulation Exception");
204 * Unknown exception handler routine
206 void UnknownException(struct pt_regs *regs)
208 #if defined(CONFIG_CMD_KGDB)
209 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
212 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
213 regs->nip, regs->msr, regs->trap);
218 * Debug exception handler routine
220 void DebugException(struct pt_regs *regs)
222 printf("Debugger trap at @ %lx\n", regs->nip );
224 #if defined(CONFIG_CMD_BEDBUG)
225 do_bedbug_breakpoint( regs );