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 /* Returns 0 if exception not found and fixup otherwise. */
41 extern unsigned long search_exception_table(unsigned long);
43 /* THIS NEEDS CHANGING to use the board info structure.
45 #define END_OF_MEM 0x02000000
48 * Trap & Exception support
51 static void print_backtrace(unsigned long *sp)
56 printf("Call backtrace: ");
58 if ((uint)sp > END_OF_MEM)
66 sp = (unsigned long *)*sp;
71 void show_regs(struct pt_regs *regs)
75 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
76 " %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:"
79 " %01x ME: %01x IR/DR: %01x%01x\n",
80 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
81 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
82 regs->msr&MSR_IR ? 1 : 0,
83 regs->msr&MSR_DR ? 1 : 0);
86 for (i = 0; i < 32; i++) {
89 printf("GPR%02d: ", i);
92 printf("%08lX ", regs->gpr[i]);
101 static void _exception(int signr, struct pt_regs *regs)
104 print_backtrace((unsigned long *)regs->gpr[1]);
105 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
108 void MachineCheckException(struct pt_regs *regs)
112 /* Probing PCI using config cycles cause this exception
113 * when a device is not present. Catch it and return to
114 * the PCI exception handler.
116 if ((fixup = search_exception_table(regs->nip)) != 0) {
121 #if defined(CONFIG_CMD_KGDB)
122 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
126 printf("Machine check in kernel mode.\n");
127 printf("Caused by (from msr): ");
128 printf("regs %p ",regs);
129 switch( regs->msr & 0x000F0000) {
130 case (0x80000000>>12):
131 printf("Machine check signal - probably due to mm fault\n"
134 case (0x80000000>>13):
135 printf("Transfer error ack signal\n");
137 case (0x80000000>>14):
138 printf("Data parity signal\n");
140 case (0x80000000>>15):
141 printf("Address parity signal\n");
144 printf("Unknown values in msr\n");
147 print_backtrace((unsigned long *)regs->gpr[1]);
148 panic("machine check");
151 void AlignmentException(struct pt_regs *regs)
153 #if defined(CONFIG_CMD_KGDB)
154 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
158 print_backtrace((unsigned long *)regs->gpr[1]);
159 panic("Alignment Exception");
162 void ProgramCheckException(struct pt_regs *regs)
164 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
167 #if defined(CONFIG_CMD_KGDB)
168 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
173 p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0);
175 for (i = 0; i < 256; i+=16) {
176 printf("%08x: ", (unsigned int)p+i);
177 for (j = 0; j < 16; j++) {
178 printf("%02x ", p[i+j]);
183 print_backtrace((unsigned long *)regs->gpr[1]);
184 panic("Program Check Exception");
187 void SoftEmuException(struct pt_regs *regs)
189 #if defined(CONFIG_CMD_KGDB)
190 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
194 print_backtrace((unsigned long *)regs->gpr[1]);
195 panic("Software Emulation Exception");
198 void UnknownException(struct pt_regs *regs)
200 #if defined(CONFIG_CMD_KGDB)
201 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
204 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
205 regs->nip, regs->msr, regs->trap);
209 /* Probe an address by reading. If not present, return -1, otherwise
212 int addr_probe(uint *addr)
217 __asm__ __volatile__( \
218 "1: lwz %0,0(%1)\n" \
222 ".section .fixup,\"ax\"\n" \
225 ".section __ex_table,\"a\"\n" \
229 : "=r" (retval) : "r"(addr));