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)
8 * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
10 * (C) Copyright 2000-2003
11 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
13 * See file CREDITS for list of people who contributed to this
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 * This file handles the architecture-dependent parts of hardware exceptions
39 #include <asm/processor.h>
41 /* Returns 0 if exception not found and fixup otherwise. */
42 extern unsigned long search_exception_table(unsigned long);
44 /* THIS NEEDS CHANGING to use the board info structure.
46 #define END_OF_MEM 0x02000000
49 * Trap & Exception support
52 static void print_backtrace(unsigned long *sp)
57 printf("Call backtrace: ");
59 if ((uint) sp > END_OF_MEM)
68 sp = (unsigned long *) *sp;
73 void show_regs(struct pt_regs *regs)
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",
81 regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
82 regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
83 regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
86 for (i = 0; i < 32; i++) {
88 printf("GPR%02d: ", i);
91 printf("%08lX ", regs->gpr[i]);
99 static void _exception(int signr, struct pt_regs *regs)
102 print_backtrace((unsigned long *) regs->gpr[1]);
103 panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
106 void MachineCheckException(struct pt_regs *regs)
108 unsigned long fixup = search_exception_table(regs->nip);
110 /* Probing PCI using config cycles cause this exception
111 * when a device is not present. Catch it and return to
112 * the PCI exception handler.
118 #if defined(CONFIG_CMD_KGDB)
119 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
123 printf("Machine check in kernel mode.\n");
124 printf("Caused by (from msr): ");
125 printf("regs %p ", regs);
126 /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
127 switch (regs->msr & 0x000F0000) {
128 case (0x80000000 >> 12):
129 printf("Machine check signal - probably due to mm fault\n"
132 case (0x80000000 >> 13):
133 printf("Transfer error ack signal\n");
135 case (0x80000000 >> 14):
136 printf("Data parity signal\n");
138 case (0x80000000 >> 15):
139 printf("Address parity signal\n");
142 printf("Unknown values in msr\n");
145 print_backtrace((unsigned long *) regs->gpr[1]);
146 panic("machine check");
149 void AlignmentException(struct pt_regs *regs)
151 #if defined(CONFIG_CMD_KGDB)
152 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
156 print_backtrace((unsigned long *) regs->gpr[1]);
157 panic("Alignment Exception");
160 void ProgramCheckException(struct pt_regs *regs)
162 #if defined(CONFIG_CMD_KGDB)
163 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
167 print_backtrace((unsigned long *) regs->gpr[1]);
168 panic("Program Check Exception");
171 void SoftEmuException(struct pt_regs *regs)
173 #if defined(CONFIG_CMD_KGDB)
174 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
178 print_backtrace((unsigned long *) regs->gpr[1]);
179 panic("Software Emulation Exception");
183 void UnknownException(struct pt_regs *regs)
185 #if defined(CONFIG_CMD_KGDB)
186 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
189 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
190 regs->nip, regs->msr, regs->trap);
194 #if defined(CONFIG_CMD_BEDBUG)
195 extern void do_bedbug_breakpoint(struct pt_regs *);
198 void DebugException(struct pt_regs *regs)
201 printf("Debugger trap at @ %lx\n", regs->nip);
203 #if defined(CONFIG_CMD_BEDBUG)
204 do_bedbug_breakpoint(regs);
208 /* Probe an address by reading. If not present, return -1, otherwise
211 int addr_probe(uint *addr)
216 __asm__ __volatile__ ("1: lwz %0,0(%1)\n"
220 ".section .fixup,\"ax\"\n"
223 ".section __ex_table,\"a\"\n"
226 ".text":"=r" (retval):"r" (addr));