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
36 #include <asm/processor.h>
38 /* Returns 0 if exception not found and fixup otherwise. */
39 extern unsigned long search_exception_table(unsigned long);
41 /* THIS NEEDS CHANGING to use the board info structure.
43 #define END_OF_MEM 0x00400000
46 * Trap & Exception support
49 static void print_backtrace(unsigned long *sp)
54 printf("Call backtrace: ");
56 if ((uint)sp > END_OF_MEM)
64 sp = (unsigned long *)*sp;
69 void show_regs(struct pt_regs *regs)
73 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
74 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
75 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
76 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
77 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
78 regs->msr&MSR_IR ? 1 : 0,
79 regs->msr&MSR_DR ? 1 : 0);
82 for (i = 0; i < 32; i++) {
85 printf("GPR%02d: ", i);
88 printf("%08lX ", regs->gpr[i]);
97 static void _exception(int signr, struct pt_regs *regs)
100 print_backtrace((unsigned long *)regs->gpr[1]);
101 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
104 void MachineCheckException(struct pt_regs *regs)
108 /* Probing PCI using config cycles cause this exception
109 * when a device is not present. Catch it and return to
110 * the PCI exception handler.
112 if ((fixup = search_exception_table(regs->nip)) != 0) {
117 printf("Machine check in kernel mode.\n");
118 printf("Caused by (from msr): ");
119 printf("regs %p ",regs);
120 switch( regs->msr & 0x000F0000) {
121 case (0x80000000>>12):
122 printf("Machine check signal - probably due to mm fault\n"
125 case (0x80000000>>13):
126 printf("Transfer error ack signal\n");
128 case (0x80000000>>14):
129 printf("Data parity signal\n");
131 case (0x80000000>>15):
132 printf("Address parity signal\n");
135 printf("Unknown values in msr\n");
138 print_backtrace((unsigned long *)regs->gpr[1]);
139 panic("machine check");
142 void AlignmentException(struct pt_regs *regs)
145 print_backtrace((unsigned long *)regs->gpr[1]);
146 panic("Alignment Exception");
149 void ProgramCheckException(struct pt_regs *regs)
152 print_backtrace((unsigned long *)regs->gpr[1]);
153 panic("Program Check Exception");
156 void SoftEmuException(struct pt_regs *regs)
159 print_backtrace((unsigned long *)regs->gpr[1]);
160 panic("Software Emulation Exception");
164 void UnknownException(struct pt_regs *regs)
166 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
167 regs->nip, regs->msr, regs->trap);
171 #if defined(CONFIG_CMD_BEDBUG)
172 extern void do_bedbug_breakpoint(struct pt_regs *);
175 void DebugException(struct pt_regs *regs)
178 printf("Debugger trap at @ %lx\n", regs->nip );
180 #if defined(CONFIG_CMD_BEDBUG)
181 do_bedbug_breakpoint( regs );
185 /* Probe an address by reading. If not present, return -1, otherwise
188 int addr_probe(uint *addr)
193 __asm__ __volatile__( \
194 "1: lwz %0,0(%1)\n" \
198 ".section .fixup,\"ax\"\n" \
201 ".section __ex_table,\"a\"\n" \
205 : "=r" (retval) : "r"(addr));