2 * linux/arch/ppc/kernel/traps.c
4 * Copyright (C) 2003 Motorola
5 * Modified by Xianghua Xiao(x.xiao@motorola.com)
7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
9 * Modified by Cort Dougan (cort@cs.nmt.edu)
10 * and Paul Mackerras (paulus@cs.anu.edu.au)
13 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 * See file CREDITS for list of people who contributed to this
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 * This file handles the architecture-dependent parts of hardware exceptions
40 #include <asm/processor.h>
42 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
43 int (*debugger_exception_handler)(struct pt_regs *) = 0;
46 /* Returns 0 if exception not found and fixup otherwise. */
47 extern unsigned long search_exception_table(unsigned long);
49 /* THIS NEEDS CHANGING to use the board info structure.
51 #define END_OF_MEM (CFG_SDRAM_SIZE * 1024 * 1024)
54 static __inline__ void set_tsr(unsigned long val)
56 asm volatile("mtspr 0x150, %0" : : "r" (val));
59 static __inline__ unsigned long get_esr(void)
62 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
66 #define ESR_MCI 0x80000000
67 #define ESR_PIL 0x08000000
68 #define ESR_PPR 0x04000000
69 #define ESR_PTR 0x02000000
70 #define ESR_DST 0x00800000
71 #define ESR_DIZ 0x00400000
72 #define ESR_U0F 0x00008000
74 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
75 extern void do_bedbug_breakpoint(struct pt_regs *);
79 * Trap & Exception support
83 print_backtrace(unsigned long *sp)
88 printf("Call backtrace: ");
90 if ((uint)sp > END_OF_MEM)
98 sp = (unsigned long *)*sp;
103 void show_regs(struct pt_regs * regs)
107 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
108 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
109 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
110 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
111 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
112 regs->msr&MSR_IR ? 1 : 0,
113 regs->msr&MSR_DR ? 1 : 0);
116 for (i = 0; i < 32; i++) {
119 printf("GPR%02d: ", i);
122 printf("%08lX ", regs->gpr[i]);
132 _exception(int signr, struct pt_regs *regs)
135 print_backtrace((unsigned long *)regs->gpr[1]);
136 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
140 CritcalInputException(struct pt_regs *regs)
142 panic("Critical Input Exception");
146 MachineCheckException(struct pt_regs *regs)
150 /* Probing PCI using config cycles cause this exception
151 * when a device is not present. Catch it and return to
152 * the PCI exception handler.
154 if ((fixup = search_exception_table(regs->nip)) != 0) {
159 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
160 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
164 printf("Machine check in kernel mode.\n");
165 printf("Caused by (from msr): ");
166 printf("regs %p ",regs);
167 switch( regs->msr & 0x000F0000) {
168 case (0x80000000>>12):
169 printf("Machine check signal - probably due to mm fault\n"
172 case (0x80000000>>13):
173 printf("Transfer error ack signal\n");
175 case (0x80000000>>14):
176 printf("Data parity signal\n");
178 case (0x80000000>>15):
179 printf("Address parity signal\n");
182 printf("Unknown values in msr\n");
185 print_backtrace((unsigned long *)regs->gpr[1]);
186 panic("machine check");
190 AlignmentException(struct pt_regs *regs)
192 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
193 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
198 print_backtrace((unsigned long *)regs->gpr[1]);
199 panic("Alignment Exception");
203 ProgramCheckException(struct pt_regs *regs)
207 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
208 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
215 if( esr_val & ESR_PIL )
216 printf( "** Illegal Instruction **\n" );
217 else if( esr_val & ESR_PPR )
218 printf( "** Privileged Instruction **\n" );
219 else if( esr_val & ESR_PTR )
220 printf( "** Trap Instruction **\n" );
222 print_backtrace((unsigned long *)regs->gpr[1]);
223 panic("Program Check Exception");
227 PITException(struct pt_regs *regs)
230 * Reset PIT interrupt
235 * Call timer_interrupt routine in interrupts.c
237 timer_interrupt(NULL);
242 UnknownException(struct pt_regs *regs)
244 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
245 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
249 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
250 regs->nip, regs->msr, regs->trap);
255 DebugException(struct pt_regs *regs)
257 printf("Debugger trap at @ %lx\n", regs->nip );
259 #if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
260 do_bedbug_breakpoint( regs );
264 /* Probe an address by reading. If not present, return -1, otherwise
268 addr_probe(uint *addr)