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 DECLARE_GLOBAL_DATA_PTR;
39 #if defined(CONFIG_CMD_KGDB)
40 int (*debugger_exception_handler)(struct pt_regs *) = 0;
43 /* Returns 0 if exception not found and fixup otherwise. */
44 extern unsigned long search_exception_table(unsigned long);
47 * End of addressable memory. This may be less than the actual
48 * amount of memory on the system if we're unable to keep all
49 * the memory mapped in.
51 extern ulong get_effective_memsize(void);
52 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
55 * Trap & Exception support
59 print_backtrace(unsigned long *sp)
64 printf("Call backtrace: ");
66 if ((uint) sp > END_OF_MEM)
75 sp = (unsigned long *)*sp;
81 show_regs(struct pt_regs *regs)
85 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
86 " %p TRAP: %04lx DAR: %08lX\n",
87 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
88 printf("MSR: %08lx EE: %01x PR: %01x FP:"
89 " %01x ME: %01x IR/DR: %01x%01x\n",
90 regs->msr, regs->msr & MSR_EE ? 1 : 0,
91 regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
92 regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
93 regs->msr & MSR_DR ? 1 : 0);
96 for (i = 0; i < 32; i++) {
98 printf("GPR%02d: ", i);
101 printf("%08lX ", regs->gpr[i]);
110 _exception(int signr, struct pt_regs *regs)
113 print_backtrace((unsigned long *)regs->gpr[1]);
114 panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
118 MachineCheckException(struct pt_regs *regs)
122 /* Probing PCI using config cycles cause this exception
123 * when a device is not present. Catch it and return to
124 * the PCI exception handler.
126 if ((fixup = search_exception_table(regs->nip)) != 0) {
131 #if defined(CONFIG_CMD_KGDB)
132 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
136 printf("Machine check in kernel mode.\n");
137 printf("Caused by (from msr): ");
138 printf("regs %p ", regs);
139 switch ( regs->msr & 0x001F0000) {
140 case (0x80000000>>11):
141 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
143 case (0x80000000>>12):
144 printf("Machine check signal - probably due to mm fault\n"
147 case (0x80000000 >> 13):
148 printf("Transfer error ack signal\n");
150 case (0x80000000 >> 14):
151 printf("Data parity signal\n");
153 case (0x80000000 >> 15):
154 printf("Address parity signal\n");
157 printf("Unknown values in msr\n");
160 print_backtrace((unsigned long *)regs->gpr[1]);
161 panic("machine check");
165 AlignmentException(struct pt_regs *regs)
167 #if defined(CONFIG_CMD_KGDB)
168 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
172 print_backtrace((unsigned long *)regs->gpr[1]);
173 panic("Alignment Exception");
177 ProgramCheckException(struct pt_regs *regs)
179 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
182 #if defined(CONFIG_CMD_KGDB)
183 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
188 p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
190 for (i = 0; i < 256; i += 16) {
191 printf("%08x: ", (unsigned int)p + i);
192 for (j = 0; j < 16; j++) {
193 printf("%02x ", p[i + j]);
198 print_backtrace((unsigned long *)regs->gpr[1]);
199 panic("Program Check Exception");
203 SoftEmuException(struct pt_regs *regs)
205 #if defined(CONFIG_CMD_KGDB)
206 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
210 print_backtrace((unsigned long *)regs->gpr[1]);
211 panic("Software Emulation Exception");
215 UnknownException(struct pt_regs *regs)
217 #if defined(CONFIG_CMD_KGDB)
218 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
221 printf("UnknownException regs@%lx\n", (ulong)regs);
222 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
223 regs->nip, regs->msr, regs->trap);
228 * Probe an address by reading.
229 * If not present, return -1,
230 * otherwise return 0.
233 addr_probe(uint *addr)