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 /* Returns 0 if exception not found and fixup otherwise. */
40 extern unsigned long search_exception_table(unsigned long);
43 * End of addressable memory. This may be less than the actual
44 * amount of memory on the system if we're unable to keep all
45 * the memory mapped in.
47 extern ulong get_effective_memsize(void);
48 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
51 * Trap & Exception support
55 print_backtrace(unsigned long *sp)
60 printf("Call backtrace: ");
62 if ((uint) sp > END_OF_MEM)
71 sp = (unsigned long *)*sp;
77 show_regs(struct pt_regs *regs)
81 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
82 " %p TRAP: %04lx DAR: %08lX\n",
83 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
84 printf("MSR: %08lx EE: %01x PR: %01x FP:"
85 " %01x ME: %01x IR/DR: %01x%01x\n",
86 regs->msr, regs->msr & MSR_EE ? 1 : 0,
87 regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
88 regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
89 regs->msr & MSR_DR ? 1 : 0);
92 for (i = 0; i < 32; i++) {
94 printf("GPR%02d: ", i);
97 printf("%08lX ", regs->gpr[i]);
106 _exception(int signr, struct pt_regs *regs)
109 print_backtrace((unsigned long *)regs->gpr[1]);
110 panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
114 MachineCheckException(struct pt_regs *regs)
118 /* Probing PCI using config cycles cause this exception
119 * when a device is not present. Catch it and return to
120 * the PCI exception handler.
122 if ((fixup = search_exception_table(regs->nip)) != 0) {
127 #if defined(CONFIG_CMD_KGDB)
128 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
132 printf("Machine check in kernel mode.\n");
133 printf("Caused by (from msr): ");
134 printf("regs %p ", regs);
135 switch ( regs->msr & 0x001F0000) {
136 case (0x80000000>>11):
137 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
139 case (0x80000000>>12):
140 printf("Machine check signal - probably due to mm fault\n"
143 case (0x80000000 >> 13):
144 printf("Transfer error ack signal\n");
146 case (0x80000000 >> 14):
147 printf("Data parity signal\n");
149 case (0x80000000 >> 15):
150 printf("Address parity signal\n");
153 printf("Unknown values in msr\n");
156 print_backtrace((unsigned long *)regs->gpr[1]);
157 panic("machine check");
161 AlignmentException(struct pt_regs *regs)
163 #if defined(CONFIG_CMD_KGDB)
164 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
168 print_backtrace((unsigned long *)regs->gpr[1]);
169 panic("Alignment Exception");
173 ProgramCheckException(struct pt_regs *regs)
175 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
178 #if defined(CONFIG_CMD_KGDB)
179 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
184 p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
186 for (i = 0; i < 256; i += 16) {
187 printf("%08x: ", (unsigned int)p + i);
188 for (j = 0; j < 16; j++) {
189 printf("%02x ", p[i + j]);
194 print_backtrace((unsigned long *)regs->gpr[1]);
195 panic("Program Check Exception");
199 SoftEmuException(struct pt_regs *regs)
201 #if defined(CONFIG_CMD_KGDB)
202 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
206 print_backtrace((unsigned long *)regs->gpr[1]);
207 panic("Software Emulation Exception");
211 UnknownException(struct pt_regs *regs)
213 #if defined(CONFIG_CMD_KGDB)
214 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
217 printf("UnknownException regs@%lx\n", (ulong)regs);
218 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
219 regs->nip, regs->msr, regs->trap);
224 * Probe an address by reading.
225 * If not present, return -1,
226 * otherwise return 0.
229 addr_probe(uint *addr)