2 * linux/arch/ppc/kernel/traps.c
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 * This file handles the architecture-dependent parts of hardware exceptions
37 #include <asm/processor.h>
39 #if (CONFIG_COMMANDS & CFG_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);
46 /* THIS NEEDS CHANGING to use the board info structure.
48 #ifdef CONFIG_AMIGAONEG3SE
49 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
51 #define END_OF_MEM 0x02000000
55 * Trap & Exception support
59 print_backtrace(unsigned long *sp)
61 #ifdef CONFIG_AMIGAONEG3SE
62 DECLARE_GLOBAL_DATA_PTR;
67 printf("Call backtrace: ");
69 if ((uint)sp > END_OF_MEM)
77 sp = (unsigned long *)*sp;
83 show_regs(struct pt_regs * regs)
87 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
88 " %p TRAP: %04lx DAR: %08lX\n",
89 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
90 printf("MSR: %08lx EE: %01x PR: %01x FP:"
91 " %01x ME: %01x IR/DR: %01x%01x\n",
92 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
93 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
94 regs->msr&MSR_IR ? 1 : 0,
95 regs->msr&MSR_DR ? 1 : 0);
98 for (i = 0; i < 32; i++) {
101 printf("GPR%02d: ", i);
104 printf("%08lX ", regs->gpr[i]);
114 _exception(int signr, struct pt_regs *regs)
117 print_backtrace((unsigned long *)regs->gpr[1]);
118 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
122 MachineCheckException(struct pt_regs *regs)
126 /* Probing PCI using config cycles cause this exception
127 * when a device is not present. Catch it and return to
128 * the PCI exception handler.
130 if ((fixup = search_exception_table(regs->nip)) != 0) {
135 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
136 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
140 printf("Machine check in kernel mode.\n");
141 printf("Caused by (from msr): ");
142 printf("regs %p ",regs);
143 switch( regs->msr & 0x0000F000)
146 printf("Machine check signal - probably due to mm fault\n"
150 printf("Transfer error ack signal\n");
153 printf("Data parity signal\n");
156 printf("Address parity signal\n");
159 printf("Unknown values in msr\n");
162 print_backtrace((unsigned long *)regs->gpr[1]);
163 panic("machine check");
167 AlignmentException(struct pt_regs *regs)
169 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
170 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
174 print_backtrace((unsigned long *)regs->gpr[1]);
175 panic("Alignment Exception");
179 ProgramCheckException(struct pt_regs *regs)
181 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
184 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
185 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
190 p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0);
192 for (i = 0; i < 256; i+=16) {
193 printf("%08x: ", (unsigned int)p+i);
194 for (j = 0; j < 16; j++) {
195 printf("%02x ", p[i+j]);
200 print_backtrace((unsigned long *)regs->gpr[1]);
201 panic("Program Check Exception");
205 SoftEmuException(struct pt_regs *regs)
207 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
208 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
212 print_backtrace((unsigned long *)regs->gpr[1]);
213 panic("Software Emulation Exception");
218 UnknownException(struct pt_regs *regs)
220 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
221 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
224 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
225 regs->nip, regs->msr, regs->trap);
229 /* Probe an address by reading. If not present, return -1, otherwise
233 addr_probe(uint *addr)
238 __asm__ __volatile__( \
239 "1: lwz %0,0(%1)\n" \
243 ".section .fixup,\"ax\"\n" \
246 ".section __ex_table,\"a\"\n" \
250 : "=r" (retval) : "r"(addr));