2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
5 * and Paul Mackerras (paulus@cs.anu.edu.au)
8 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
10 * See file CREDITS for list of people who contributed to this
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 * This file handles the architecture-dependent parts of hardware exceptions
35 #include <asm/processor.h>
37 #if defined(CONFIG_CMD_KGDB)
38 int (*debugger_exception_handler)(struct pt_regs *) = 0;
41 /* Returns 0 if exception not found and fixup otherwise. */
42 extern unsigned long search_exception_table(unsigned long);
44 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
47 * Trap & Exception support
51 print_backtrace(unsigned long *sp)
53 DECLARE_GLOBAL_DATA_PTR;
58 printf("Call backtrace: ");
60 if ((uint) sp > END_OF_MEM)
69 sp = (unsigned long *)*sp;
75 show_regs(struct pt_regs *regs)
79 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
80 " %p TRAP: %04lx DAR: %08lX\n",
81 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
82 printf("MSR: %08lx EE: %01x PR: %01x FP:"
83 " %01x ME: %01x IR/DR: %01x%01x\n",
84 regs->msr, regs->msr & MSR_EE ? 1 : 0,
85 regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
86 regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
87 regs->msr & MSR_DR ? 1 : 0);
90 for (i = 0; i < 32; i++) {
92 printf("GPR%02d: ", i);
95 printf("%08lX ", regs->gpr[i]);
104 _exception(int signr, struct pt_regs *regs)
107 print_backtrace((unsigned long *)regs->gpr[1]);
108 panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
112 MachineCheckException(struct pt_regs *regs)
116 /* Probing PCI using config cycles cause this exception
117 * when a device is not present. Catch it and return to
118 * the PCI exception handler.
120 if ((fixup = search_exception_table(regs->nip)) != 0) {
125 #if defined(CONFIG_CMD_KGDB)
126 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
130 printf("Machine check in kernel mode.\n");
131 printf("Caused by (from msr): ");
132 printf("regs %p ", regs);
133 switch ( regs->msr & 0x001F0000) {
134 case (0x80000000>>11):
135 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
137 case (0x80000000>>12):
138 printf("Machine check signal - probably due to mm fault\n"
141 case (0x80000000 >> 13):
142 printf("Transfer error ack signal\n");
144 case (0x80000000 >> 14):
145 printf("Data parity signal\n");
147 case (0x80000000 >> 15):
148 printf("Address parity signal\n");
151 printf("Unknown values in msr\n");
154 print_backtrace((unsigned long *)regs->gpr[1]);
155 panic("machine check");
159 AlignmentException(struct pt_regs *regs)
161 #if defined(CONFIG_CMD_KGDB)
162 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
166 print_backtrace((unsigned long *)regs->gpr[1]);
167 panic("Alignment Exception");
171 ProgramCheckException(struct pt_regs *regs)
173 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
176 #if defined(CONFIG_CMD_KGDB)
177 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
182 p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
184 for (i = 0; i < 256; i += 16) {
185 printf("%08x: ", (unsigned int)p + i);
186 for (j = 0; j < 16; j++) {
187 printf("%02x ", p[i + j]);
192 print_backtrace((unsigned long *)regs->gpr[1]);
193 panic("Program Check Exception");
197 SoftEmuException(struct pt_regs *regs)
199 #if defined(CONFIG_CMD_KGDB)
200 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
204 print_backtrace((unsigned long *)regs->gpr[1]);
205 panic("Software Emulation Exception");
209 UnknownException(struct pt_regs *regs)
211 #if defined(CONFIG_CMD_KGDB)
212 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
215 printf("UnknownException regs@%x\n", regs);
216 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
217 regs->nip, regs->msr, regs->trap);
222 * Probe an address by reading.
223 * If not present, return -1,
224 * otherwise return 0.
227 addr_probe(uint *addr)