2 * linux/arch/ppc/kernel/traps.c
4 * Copyright 2007 Freescale Semiconductor.
5 * Copyright (C) 2003 Motorola
6 * Modified by Xianghua Xiao(x.xiao@motorola.com)
8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
10 * Modified by Cort Dougan (cort@cs.nmt.edu)
11 * and Paul Mackerras (paulus@cs.anu.edu.au)
14 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
16 * See file CREDITS for list of people who contributed to this
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation; either version 2 of
22 * the License, or (at your option) any later version.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
36 * This file handles the architecture-dependent parts of hardware exceptions
41 #include <asm/processor.h>
43 DECLARE_GLOBAL_DATA_PTR;
45 #if defined(CONFIG_CMD_KGDB)
46 int (*debugger_exception_handler)(struct pt_regs *) = 0;
49 /* Returns 0 if exception not found and fixup otherwise. */
50 extern unsigned long search_exception_table(unsigned long);
53 * End of memory as shown by board info and determined by DDR setup.
55 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
58 static __inline__ void set_tsr(unsigned long val)
60 asm volatile("mtspr 0x150, %0" : : "r" (val));
63 static __inline__ unsigned long get_esr(void)
66 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
70 #define ESR_MCI 0x80000000
71 #define ESR_PIL 0x08000000
72 #define ESR_PPR 0x04000000
73 #define ESR_PTR 0x02000000
74 #define ESR_DST 0x00800000
75 #define ESR_DIZ 0x00400000
76 #define ESR_U0F 0x00008000
78 #if defined(CONFIG_CMD_BEDBUG)
79 extern void do_bedbug_breakpoint(struct pt_regs *);
83 * Trap & Exception support
87 print_backtrace(unsigned long *sp)
92 printf("Call backtrace: ");
94 if ((uint)sp > END_OF_MEM)
102 sp = (unsigned long *)*sp;
107 void show_regs(struct pt_regs * regs)
111 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
112 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
113 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
114 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
115 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
116 regs->msr&MSR_IR ? 1 : 0,
117 regs->msr&MSR_DR ? 1 : 0);
120 for (i = 0; i < 32; i++) {
123 printf("GPR%02d: ", i);
126 printf("%08lX ", regs->gpr[i]);
136 _exception(int signr, struct pt_regs *regs)
139 print_backtrace((unsigned long *)regs->gpr[1]);
140 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
144 CritcalInputException(struct pt_regs *regs)
146 panic("Critical Input Exception");
149 int machinecheck_count = 0;
150 int machinecheck_error = 0;
152 MachineCheckException(struct pt_regs *regs)
155 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
157 /* Probing PCI using config cycles cause this exception
158 * when a device is not present. Catch it and return to
159 * the PCI exception handler.
161 if ((fixup = search_exception_table(regs->nip)) != 0) {
166 mcsrr0 = mfspr(SPRN_MCSRR0);
167 mcsrr1 = mfspr(SPRN_MCSRR1);
168 mcsr = mfspr(SPRN_MCSR);
169 mcar = mfspr(SPRN_MCAR);
171 machinecheck_count++;
172 machinecheck_error=1;
174 #if defined(CONFIG_CMD_KGDB)
175 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
179 printf("Machine check in kernel mode.\n");
180 printf("Caused by (from mcsr): ");
181 printf("mcsr = 0x%08x\n", mcsr);
182 if (mcsr & 0x80000000)
183 printf("Machine check input pin\n");
184 if (mcsr & 0x40000000)
185 printf("Instruction cache parity error\n");
186 if (mcsr & 0x20000000)
187 printf("Data cache push parity error\n");
188 if (mcsr & 0x10000000)
189 printf("Data cache parity error\n");
190 if (mcsr & 0x00000080)
191 printf("Bus instruction address error\n");
192 if (mcsr & 0x00000040)
193 printf("Bus Read address error\n");
194 if (mcsr & 0x00000020)
195 printf("Bus Write address error\n");
196 if (mcsr & 0x00000010)
197 printf("Bus Instruction data bus error\n");
198 if (mcsr & 0x00000008)
199 printf("Bus Read data bus error\n");
200 if (mcsr & 0x00000004)
201 printf("Bus Write bus error\n");
202 if (mcsr & 0x00000002)
203 printf("Bus Instruction parity error\n");
204 if (mcsr & 0x00000001)
205 printf("Bus Read parity error\n");
208 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
209 mcsr, mcsrr0, mcsrr1, mcar);
210 print_backtrace((unsigned long *)regs->gpr[1]);
211 if (machinecheck_count > 10) {
212 panic("machine check count too high\n");
215 if (machinecheck_count > 1) {
216 regs->nip += 4; /* skip offending instruction */
217 printf("Skipping current instr, Returning to 0x%08x\n",
220 printf("Returning back to 0x%08x\n",regs->nip);
225 AlignmentException(struct pt_regs *regs)
227 #if defined(CONFIG_CMD_KGDB)
228 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
233 print_backtrace((unsigned long *)regs->gpr[1]);
234 panic("Alignment Exception");
238 ProgramCheckException(struct pt_regs *regs)
242 #if defined(CONFIG_CMD_KGDB)
243 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
250 if( esr_val & ESR_PIL )
251 printf( "** Illegal Instruction **\n" );
252 else if( esr_val & ESR_PPR )
253 printf( "** Privileged Instruction **\n" );
254 else if( esr_val & ESR_PTR )
255 printf( "** Trap Instruction **\n" );
257 print_backtrace((unsigned long *)regs->gpr[1]);
258 panic("Program Check Exception");
262 PITException(struct pt_regs *regs)
265 * Reset PIT interrupt
270 * Call timer_interrupt routine in interrupts.c
272 timer_interrupt(NULL);
277 UnknownException(struct pt_regs *regs)
279 #if defined(CONFIG_CMD_KGDB)
280 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
284 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
285 regs->nip, regs->msr, regs->trap);
289 ExtIntException(struct pt_regs *regs)
291 volatile immap_t *immap = (immap_t *)CFG_IMMR;
292 volatile ccsr_pic_t *pic = &immap->im_pic;
295 #if defined(CONFIG_CMD_KGDB)
296 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
300 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
301 regs->nip, regs->msr, regs->trap);
303 printf(" irq IACK0@%05x=%d\n",&pic->iack0,vect);
305 print_backtrace((unsigned long *)regs->gpr[1]);
306 machinecheck_count++;
308 printf("Returning back to 0x%08x\n",regs->nip);
310 regs->nip += 4; /* skip offending instruction */
311 printf("Skipping current instr, Returning to 0x%08x\n",regs->nip);
317 DebugException(struct pt_regs *regs)
319 printf("Debugger trap at @ %lx\n", regs->nip );
321 #if defined(CONFIG_CMD_BEDBUG)
322 do_bedbug_breakpoint( regs );
326 /* Probe an address by reading. If not present, return -1, otherwise
330 addr_probe(uint *addr)