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
36 #include <asm/processor.h>
38 DECLARE_GLOBAL_DATA_PTR;
40 /* Returns 0 if exception not found and fixup otherwise. */
41 extern unsigned long search_exception_table(unsigned long);
44 * End of addressable memory. This may be less than the actual
45 * amount of memory on the system if we're unable to keep all
46 * the memory mapped in.
48 extern ulong get_effective_memsize(void);
49 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
52 * Trap & Exception support
55 static void print_backtrace(unsigned long *sp)
60 printf("Call backtrace: ");
62 if ((uint) sp > END_OF_MEM)
71 sp = (unsigned long *)*sp;
76 void show_regs(struct pt_regs *regs)
80 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
81 " %p TRAP: %04lx DAR: %08lX\n",
82 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
83 printf("MSR: %08lx EE: %01x PR: %01x FP:"
84 " %01x ME: %01x IR/DR: %01x%01x\n",
85 regs->msr, regs->msr & MSR_EE ? 1 : 0,
86 regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
87 regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
88 regs->msr & MSR_DR ? 1 : 0);
91 for (i = 0; i < 32; i++) {
93 printf("GPR%02d: ", i);
96 printf("%08lX ", regs->gpr[i]);
104 static void _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);
111 void MachineCheckException(struct pt_regs *regs)
115 /* Probing PCI using config cycles cause this exception
116 * when a device is not present. Catch it and return to
117 * the PCI exception handler.
119 if ((fixup = search_exception_table(regs->nip)) != 0) {
124 #if defined(CONFIG_CMD_KGDB)
125 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
129 printf("Machine check in kernel mode.\n");
130 printf("Caused by (from msr): ");
131 printf("regs %p ", regs);
132 switch ( regs->msr & 0x001F0000) {
133 case (0x80000000>>11):
134 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
136 case (0x80000000>>12):
137 printf("Machine check signal - probably due to mm fault\n"
140 case (0x80000000 >> 13):
141 printf("Transfer error ack signal\n");
143 case (0x80000000 >> 14):
144 printf("Data parity signal\n");
146 case (0x80000000 >> 15):
147 printf("Address parity signal\n");
150 printf("Unknown values in msr\n");
153 print_backtrace((unsigned long *)regs->gpr[1]);
154 panic("machine check");
157 void AlignmentException(struct pt_regs *regs)
159 #if defined(CONFIG_CMD_KGDB)
160 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
164 print_backtrace((unsigned long *)regs->gpr[1]);
165 panic("Alignment Exception");
168 void ProgramCheckException(struct pt_regs *regs)
170 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
173 #if defined(CONFIG_CMD_KGDB)
174 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
179 p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
181 for (i = 0; i < 256; i += 16) {
182 printf("%08x: ", (unsigned int)p + i);
183 for (j = 0; j < 16; j++) {
184 printf("%02x ", p[i + j]);
189 print_backtrace((unsigned long *)regs->gpr[1]);
190 panic("Program Check Exception");
193 void SoftEmuException(struct pt_regs *regs)
195 #if defined(CONFIG_CMD_KGDB)
196 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
200 print_backtrace((unsigned long *)regs->gpr[1]);
201 panic("Software Emulation Exception");
204 void UnknownException(struct pt_regs *regs)
206 #if defined(CONFIG_CMD_KGDB)
207 if (debugger_exception_handler && (*debugger_exception_handler) (regs))
210 printf("UnknownException regs@%lx\n", (ulong)regs);
211 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
212 regs->nip, regs->msr, regs->trap);
217 * Probe an address by reading.
218 * If not present, return -1,
219 * otherwise return 0.
221 int addr_probe(uint *addr)