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 (CONFIG_COMMANDS & CFG_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)
68 sp = (unsigned long *)*sp;
74 show_regs(struct pt_regs * regs)
78 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
79 " %p TRAP: %04lx DAR: %08lX\n",
80 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
81 printf("MSR: %08lx EE: %01x PR: %01x FP:"
82 " %01x ME: %01x IR/DR: %01x%01x\n",
83 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
84 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
85 regs->msr&MSR_IR ? 1 : 0,
86 regs->msr&MSR_DR ? 1 : 0);
89 for (i = 0; i < 32; i++) {
92 printf("GPR%02d: ", i);
95 printf("%08lX ", regs->gpr[i]);
105 _exception(int signr, struct pt_regs *regs)
108 print_backtrace((unsigned long *)regs->gpr[1]);
109 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
113 MachineCheckException(struct pt_regs *regs)
117 /* Probing PCI using config cycles cause this exception
118 * when a device is not present. Catch it and return to
119 * the PCI exception handler.
121 if ((fixup = search_exception_table(regs->nip)) != 0) {
126 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
127 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
131 printf("Machine check in kernel mode.\n");
132 printf("Caused by (from msr): ");
133 printf("regs %p ",regs);
134 switch( regs->msr & 0x000F0000) {
135 case (0x80000000>>12):
136 printf("Machine check signal - probably due to mm fault\n"
139 case (0x80000000>>13):
140 printf("Transfer error ack signal\n");
142 case (0x80000000>>14):
143 printf("Data parity signal\n");
145 case (0x80000000>>15):
146 printf("Address parity signal\n");
149 printf("Unknown values in msr\n");
152 print_backtrace((unsigned long *)regs->gpr[1]);
153 panic("machine check");
157 AlignmentException(struct pt_regs *regs)
159 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
160 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
164 print_backtrace((unsigned long *)regs->gpr[1]);
165 panic("Alignment Exception");
169 ProgramCheckException(struct pt_regs *regs)
171 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
174 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
175 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
180 p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0);
182 for (i = 0; i < 256; i+=16) {
183 printf("%08x: ", (unsigned int)p+i);
184 for (j = 0; j < 16; j++) {
185 printf("%02x ", p[i+j]);
190 print_backtrace((unsigned long *)regs->gpr[1]);
191 panic("Program Check Exception");
195 SoftEmuException(struct pt_regs *regs)
197 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
198 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
202 print_backtrace((unsigned long *)regs->gpr[1]);
203 panic("Software Emulation Exception");
208 UnknownException(struct pt_regs *regs)
210 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
211 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
214 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
215 regs->nip, regs->msr, regs->trap);
219 /* Probe an address by reading. If not present, return -1, otherwise
223 addr_probe(uint *addr)
228 __asm__ __volatile__( \
229 "1: lwz %0,0(%1)\n" \
233 ".section .fixup,\"ax\"\n" \
236 ".section __ex_table,\"a\"\n" \
240 : "=r" (retval) : "r"(addr));