2 * linux/arch/powerpc/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
42 #include <asm/processor.h>
44 DECLARE_GLOBAL_DATA_PTR;
46 /* Returns 0 if exception not found and fixup otherwise. */
47 extern unsigned long search_exception_table(unsigned long);
50 * End of addressable memory. This may be less than the actual
51 * amount of memory on the system if we're unable to keep all
52 * the memory mapped in.
54 extern ulong get_effective_memsize(void);
55 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
57 static __inline__ void set_tsr(unsigned long val)
59 asm volatile("mtspr 0x150, %0" : : "r" (val));
62 static __inline__ unsigned long get_esr(void)
65 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
69 #define ESR_MCI 0x80000000
70 #define ESR_PIL 0x08000000
71 #define ESR_PPR 0x04000000
72 #define ESR_PTR 0x02000000
73 #define ESR_DST 0x00800000
74 #define ESR_DIZ 0x00400000
75 #define ESR_U0F 0x00008000
77 #if defined(CONFIG_CMD_BEDBUG)
78 extern void do_bedbug_breakpoint(struct pt_regs *);
82 * Trap & Exception support
85 static void 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]);
133 static void _exception(int signr, struct pt_regs *regs)
136 print_backtrace((unsigned long *)regs->gpr[1]);
137 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
140 void CritcalInputException(struct pt_regs *regs)
142 panic("Critical Input Exception");
145 int machinecheck_count = 0;
146 int machinecheck_error = 0;
147 void MachineCheckException(struct pt_regs *regs)
150 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
152 /* Probing PCI using config cycles cause this exception
153 * when a device is not present. Catch it and return to
154 * the PCI exception handler.
156 if ((fixup = search_exception_table(regs->nip)) != 0) {
161 mcsrr0 = mfspr(SPRN_MCSRR0);
162 mcsrr1 = mfspr(SPRN_MCSRR1);
163 mcsr = mfspr(SPRN_MCSR);
164 mcar = mfspr(SPRN_MCAR);
166 machinecheck_count++;
167 machinecheck_error=1;
169 #if defined(CONFIG_CMD_KGDB)
170 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
174 printf("Machine check in kernel mode.\n");
175 printf("Caused by (from mcsr): ");
176 printf("mcsr = 0x%08x\n", mcsr);
177 if (mcsr & 0x80000000)
178 printf("Machine check input pin\n");
179 if (mcsr & 0x40000000)
180 printf("Instruction cache parity error\n");
181 if (mcsr & 0x20000000)
182 printf("Data cache push parity error\n");
183 if (mcsr & 0x10000000)
184 printf("Data cache parity error\n");
185 if (mcsr & 0x00000080)
186 printf("Bus instruction address error\n");
187 if (mcsr & 0x00000040)
188 printf("Bus Read address error\n");
189 if (mcsr & 0x00000020)
190 printf("Bus Write address error\n");
191 if (mcsr & 0x00000010)
192 printf("Bus Instruction data bus error\n");
193 if (mcsr & 0x00000008)
194 printf("Bus Read data bus error\n");
195 if (mcsr & 0x00000004)
196 printf("Bus Write bus error\n");
197 if (mcsr & 0x00000002)
198 printf("Bus Instruction parity error\n");
199 if (mcsr & 0x00000001)
200 printf("Bus Read parity error\n");
203 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
204 mcsr, mcsrr0, mcsrr1, mcar);
205 print_backtrace((unsigned long *)regs->gpr[1]);
206 if (machinecheck_count > 10) {
207 panic("machine check count too high\n");
210 if (machinecheck_count > 1) {
211 regs->nip += 4; /* skip offending instruction */
212 printf("Skipping current instr, Returning to 0x%08lx\n",
215 printf("Returning back to 0x%08lx\n",regs->nip);
219 void AlignmentException(struct pt_regs *regs)
221 #if defined(CONFIG_CMD_KGDB)
222 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
227 print_backtrace((unsigned long *)regs->gpr[1]);
228 panic("Alignment Exception");
231 void ProgramCheckException(struct pt_regs *regs)
235 #if defined(CONFIG_CMD_KGDB)
236 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
243 if( esr_val & ESR_PIL )
244 printf( "** Illegal Instruction **\n" );
245 else if( esr_val & ESR_PPR )
246 printf( "** Privileged Instruction **\n" );
247 else if( esr_val & ESR_PTR )
248 printf( "** Trap Instruction **\n" );
250 print_backtrace((unsigned long *)regs->gpr[1]);
251 panic("Program Check Exception");
254 void PITException(struct pt_regs *regs)
257 * Reset PIT interrupt
262 * Call timer_interrupt routine in interrupts.c
264 timer_interrupt(NULL);
267 void UnknownException(struct pt_regs *regs)
269 #if defined(CONFIG_CMD_KGDB)
270 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
274 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
275 regs->nip, regs->msr, regs->trap);
279 void ExtIntException(struct pt_regs *regs)
281 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
285 #if defined(CONFIG_CMD_KGDB)
286 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
290 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
291 regs->nip, regs->msr, regs->trap);
293 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
295 print_backtrace((unsigned long *)regs->gpr[1]);
298 void DebugException(struct pt_regs *regs)
300 printf("Debugger trap at @ %lx\n", regs->nip );
302 #if defined(CONFIG_CMD_BEDBUG)
303 do_bedbug_breakpoint( regs );
307 /* Probe an address by reading. If not present, return -1, otherwise
310 int addr_probe(uint *addr)