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 * SPDX-License-Identifier: GPL-2.0+
20 * This file handles the architecture-dependent parts of hardware exceptions
26 #include <asm/processor.h>
28 DECLARE_GLOBAL_DATA_PTR;
30 /* Returns 0 if exception not found and fixup otherwise. */
31 extern unsigned long search_exception_table(unsigned long);
34 * End of addressable memory. This may be less than the actual
35 * amount of memory on the system if we're unable to keep all
36 * the memory mapped in.
38 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
40 static __inline__ void set_tsr(unsigned long val)
42 asm volatile("mtspr 0x150, %0" : : "r" (val));
45 static __inline__ unsigned long get_esr(void)
48 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
52 #define ESR_MCI 0x80000000
53 #define ESR_PIL 0x08000000
54 #define ESR_PPR 0x04000000
55 #define ESR_PTR 0x02000000
56 #define ESR_DST 0x00800000
57 #define ESR_DIZ 0x00400000
58 #define ESR_U0F 0x00008000
60 #if defined(CONFIG_CMD_BEDBUG)
61 extern void do_bedbug_breakpoint(struct pt_regs *);
65 * Trap & Exception support
68 static void print_backtrace(unsigned long *sp)
73 printf("Call backtrace: ");
75 if ((uint)sp > END_OF_MEM)
83 sp = (unsigned long *)*sp;
88 void show_regs(struct pt_regs *regs)
92 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
93 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
94 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
95 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
96 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
97 regs->msr&MSR_IR ? 1 : 0,
98 regs->msr&MSR_DR ? 1 : 0);
101 for (i = 0; i < 32; i++) {
104 printf("GPR%02d: ", i);
107 printf("%08lX ", regs->gpr[i]);
116 static void _exception(int signr, struct pt_regs *regs)
119 print_backtrace((unsigned long *)regs->gpr[1]);
120 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
123 void CritcalInputException(struct pt_regs *regs)
125 panic("Critical Input Exception");
128 int machinecheck_count = 0;
129 int machinecheck_error = 0;
130 void MachineCheckException(struct pt_regs *regs)
133 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
135 /* Probing PCI using config cycles cause this exception
136 * when a device is not present. Catch it and return to
137 * the PCI exception handler.
139 if ((fixup = search_exception_table(regs->nip)) != 0) {
144 mcsrr0 = mfspr(SPRN_MCSRR0);
145 mcsrr1 = mfspr(SPRN_MCSRR1);
146 mcsr = mfspr(SPRN_MCSR);
147 mcar = mfspr(SPRN_MCAR);
149 machinecheck_count++;
150 machinecheck_error=1;
152 #if defined(CONFIG_CMD_KGDB)
153 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
157 printf("Machine check in kernel mode.\n");
158 printf("Caused by (from mcsr): ");
159 printf("mcsr = 0x%08x\n", mcsr);
160 if (mcsr & 0x80000000)
161 printf("Machine check input pin\n");
162 if (mcsr & 0x40000000)
163 printf("Instruction cache parity error\n");
164 if (mcsr & 0x20000000)
165 printf("Data cache push parity error\n");
166 if (mcsr & 0x10000000)
167 printf("Data cache parity error\n");
168 if (mcsr & 0x00000080)
169 printf("Bus instruction address error\n");
170 if (mcsr & 0x00000040)
171 printf("Bus Read address error\n");
172 if (mcsr & 0x00000020)
173 printf("Bus Write address error\n");
174 if (mcsr & 0x00000010)
175 printf("Bus Instruction data bus error\n");
176 if (mcsr & 0x00000008)
177 printf("Bus Read data bus error\n");
178 if (mcsr & 0x00000004)
179 printf("Bus Write bus error\n");
180 if (mcsr & 0x00000002)
181 printf("Bus Instruction parity error\n");
182 if (mcsr & 0x00000001)
183 printf("Bus Read parity error\n");
186 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
187 mcsr, mcsrr0, mcsrr1, mcar);
188 print_backtrace((unsigned long *)regs->gpr[1]);
189 if (machinecheck_count > 10) {
190 panic("machine check count too high\n");
193 if (machinecheck_count > 1) {
194 regs->nip += 4; /* skip offending instruction */
195 printf("Skipping current instr, Returning to 0x%08lx\n",
198 printf("Returning back to 0x%08lx\n",regs->nip);
202 void AlignmentException(struct pt_regs *regs)
204 #if defined(CONFIG_CMD_KGDB)
205 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
210 print_backtrace((unsigned long *)regs->gpr[1]);
211 panic("Alignment Exception");
214 void ProgramCheckException(struct pt_regs *regs)
218 #if defined(CONFIG_CMD_KGDB)
219 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
226 if( esr_val & ESR_PIL )
227 printf( "** Illegal Instruction **\n" );
228 else if( esr_val & ESR_PPR )
229 printf( "** Privileged Instruction **\n" );
230 else if( esr_val & ESR_PTR )
231 printf( "** Trap Instruction **\n" );
233 print_backtrace((unsigned long *)regs->gpr[1]);
234 panic("Program Check Exception");
237 void PITException(struct pt_regs *regs)
240 * Reset PIT interrupt
245 * Call timer_interrupt routine in interrupts.c
247 timer_interrupt(NULL);
250 void UnknownException(struct pt_regs *regs)
252 #if defined(CONFIG_CMD_KGDB)
253 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
257 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
258 regs->nip, regs->msr, regs->trap);
262 void ExtIntException(struct pt_regs *regs)
264 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
268 #if defined(CONFIG_CMD_KGDB)
269 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
273 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
274 regs->nip, regs->msr, regs->trap);
276 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
278 print_backtrace((unsigned long *)regs->gpr[1]);
281 void DebugException(struct pt_regs *regs)
283 printf("Debugger trap at @ %lx\n", regs->nip );
285 #if defined(CONFIG_CMD_BEDBUG)
286 do_bedbug_breakpoint( regs );
290 /* Probe an address by reading. If not present, return -1, otherwise
293 int addr_probe(uint *addr)