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 /* Returns 0 if exception not found and fixup otherwise. */
46 extern unsigned long search_exception_table(unsigned long);
49 * End of addressable memory. This may be less than the actual
50 * amount of memory on the system if we're unable to keep all
51 * the memory mapped in.
53 extern ulong get_effective_memsize(void);
54 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
56 static __inline__ void set_tsr(unsigned long val)
58 asm volatile("mtspr 0x150, %0" : : "r" (val));
61 static __inline__ unsigned long get_esr(void)
64 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
68 #define ESR_MCI 0x80000000
69 #define ESR_PIL 0x08000000
70 #define ESR_PPR 0x04000000
71 #define ESR_PTR 0x02000000
72 #define ESR_DST 0x00800000
73 #define ESR_DIZ 0x00400000
74 #define ESR_U0F 0x00008000
76 #if defined(CONFIG_CMD_BEDBUG)
77 extern void do_bedbug_breakpoint(struct pt_regs *);
81 * Trap & Exception support
85 print_backtrace(unsigned long *sp)
90 printf("Call backtrace: ");
92 if ((uint)sp > END_OF_MEM)
100 sp = (unsigned long *)*sp;
105 void show_regs(struct pt_regs * regs)
109 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
110 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
111 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
112 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
113 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
114 regs->msr&MSR_IR ? 1 : 0,
115 regs->msr&MSR_DR ? 1 : 0);
118 for (i = 0; i < 32; i++) {
121 printf("GPR%02d: ", i);
124 printf("%08lX ", regs->gpr[i]);
134 _exception(int signr, struct pt_regs *regs)
137 print_backtrace((unsigned long *)regs->gpr[1]);
138 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
142 CritcalInputException(struct pt_regs *regs)
144 panic("Critical Input Exception");
147 int machinecheck_count = 0;
148 int machinecheck_error = 0;
150 MachineCheckException(struct pt_regs *regs)
153 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
155 /* Probing PCI using config cycles cause this exception
156 * when a device is not present. Catch it and return to
157 * the PCI exception handler.
159 if ((fixup = search_exception_table(regs->nip)) != 0) {
164 mcsrr0 = mfspr(SPRN_MCSRR0);
165 mcsrr1 = mfspr(SPRN_MCSRR1);
166 mcsr = mfspr(SPRN_MCSR);
167 mcar = mfspr(SPRN_MCAR);
169 machinecheck_count++;
170 machinecheck_error=1;
172 #if defined(CONFIG_CMD_KGDB)
173 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
177 printf("Machine check in kernel mode.\n");
178 printf("Caused by (from mcsr): ");
179 printf("mcsr = 0x%08x\n", mcsr);
180 if (mcsr & 0x80000000)
181 printf("Machine check input pin\n");
182 if (mcsr & 0x40000000)
183 printf("Instruction cache parity error\n");
184 if (mcsr & 0x20000000)
185 printf("Data cache push parity error\n");
186 if (mcsr & 0x10000000)
187 printf("Data cache parity error\n");
188 if (mcsr & 0x00000080)
189 printf("Bus instruction address error\n");
190 if (mcsr & 0x00000040)
191 printf("Bus Read address error\n");
192 if (mcsr & 0x00000020)
193 printf("Bus Write address error\n");
194 if (mcsr & 0x00000010)
195 printf("Bus Instruction data bus error\n");
196 if (mcsr & 0x00000008)
197 printf("Bus Read data bus error\n");
198 if (mcsr & 0x00000004)
199 printf("Bus Write bus error\n");
200 if (mcsr & 0x00000002)
201 printf("Bus Instruction parity error\n");
202 if (mcsr & 0x00000001)
203 printf("Bus Read parity error\n");
206 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
207 mcsr, mcsrr0, mcsrr1, mcar);
208 print_backtrace((unsigned long *)regs->gpr[1]);
209 if (machinecheck_count > 10) {
210 panic("machine check count too high\n");
213 if (machinecheck_count > 1) {
214 regs->nip += 4; /* skip offending instruction */
215 printf("Skipping current instr, Returning to 0x%08lx\n",
218 printf("Returning back to 0x%08lx\n",regs->nip);
223 AlignmentException(struct pt_regs *regs)
225 #if defined(CONFIG_CMD_KGDB)
226 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
231 print_backtrace((unsigned long *)regs->gpr[1]);
232 panic("Alignment Exception");
236 ProgramCheckException(struct pt_regs *regs)
240 #if defined(CONFIG_CMD_KGDB)
241 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
248 if( esr_val & ESR_PIL )
249 printf( "** Illegal Instruction **\n" );
250 else if( esr_val & ESR_PPR )
251 printf( "** Privileged Instruction **\n" );
252 else if( esr_val & ESR_PTR )
253 printf( "** Trap Instruction **\n" );
255 print_backtrace((unsigned long *)regs->gpr[1]);
256 panic("Program Check Exception");
260 PITException(struct pt_regs *regs)
263 * Reset PIT interrupt
268 * Call timer_interrupt routine in interrupts.c
270 timer_interrupt(NULL);
275 UnknownException(struct pt_regs *regs)
277 #if defined(CONFIG_CMD_KGDB)
278 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
282 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
283 regs->nip, regs->msr, regs->trap);
288 ExtIntException(struct pt_regs *regs)
290 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC85xx_PIC_ADDR);
294 #if defined(CONFIG_CMD_KGDB)
295 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
299 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
300 regs->nip, regs->msr, regs->trap);
302 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
304 print_backtrace((unsigned long *)regs->gpr[1]);
308 DebugException(struct pt_regs *regs)
310 printf("Debugger trap at @ %lx\n", regs->nip );
312 #if defined(CONFIG_CMD_BEDBUG)
313 do_bedbug_breakpoint( regs );
317 /* Probe an address by reading. If not present, return -1, otherwise
321 addr_probe(uint *addr)