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)
67 sp = (unsigned long *)*sp;
72 void show_regs(struct pt_regs *regs)
76 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
77 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
78 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
79 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
80 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
81 regs->msr&MSR_IR ? 1 : 0,
82 regs->msr&MSR_DR ? 1 : 0);
85 for (i = 0; i < 32; i++) {
88 printf("GPR%02d: ", i);
91 printf("%08lX ", regs->gpr[i]);
100 static void _exception(int signr, struct pt_regs *regs)
103 print_backtrace((unsigned long *)regs->gpr[1]);
104 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
107 void MachineCheckException(struct pt_regs *regs)
111 /* Probing PCI using config cycles cause this exception
112 * when a device is not present. Catch it and return to
113 * the PCI exception handler.
115 if ((fixup = search_exception_table(regs->nip)) != 0) {
120 #if defined(CONFIG_CMD_KGDB)
121 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
125 printf("Machine check in kernel mode.\n");
126 printf("Caused by (from msr): ");
127 printf("regs %p ",regs);
128 /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
129 switch( regs->msr & 0x000F0000)
131 case (0x80000000>>12) :
132 printf("Machine check signal - probably due to mm fault\n"
135 case (0x80000000>>13) :
136 printf("Transfer error ack signal\n");
138 case (0x80000000>>14) :
139 printf("Data parity signal\n");
141 case (0x80000000>>15) :
142 printf("Address parity signal\n");
145 printf("Unknown values in msr\n");
148 print_backtrace((unsigned long *)regs->gpr[1]);
149 panic("machine check");
152 void AlignmentException(struct pt_regs *regs)
154 #if defined(CONFIG_CMD_KGDB)
155 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
159 print_backtrace((unsigned long *)regs->gpr[1]);
160 panic("Alignment Exception");
163 void ProgramCheckException(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("Program Check Exception");
174 void SoftEmuException(struct pt_regs *regs)
176 #if defined(CONFIG_CMD_KGDB)
177 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
181 print_backtrace((unsigned long *)regs->gpr[1]);
182 panic("Software Emulation Exception");
186 void UnknownException(struct pt_regs *regs)
188 #if defined(CONFIG_CMD_KGDB)
189 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
192 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
193 regs->nip, regs->msr, regs->trap);
197 #if defined(CONFIG_CMD_BEDBUG)
198 extern void do_bedbug_breakpoint(struct pt_regs *);
201 void DebugException(struct pt_regs *regs)
204 printf("Debugger trap at @ %lx\n", regs->nip );
206 #if defined(CONFIG_CMD_BEDBUG)
207 do_bedbug_breakpoint( regs );
211 /* Probe an address by reading. If not present, return -1, otherwise
214 int addr_probe(uint *addr)
219 __asm__ __volatile__( \
220 "1: lwz %0,0(%1)\n" \
224 ".section .fixup,\"ax\"\n" \
227 ".section __ex_table,\"a\"\n" \
231 : "=r" (retval) : "r"(addr));