1 // SPDX-License-Identifier: GPL-2.0+
3 * linux/arch/powerpc/kernel/traps.c
5 * Copyright 2007 Freescale Semiconductor.
6 * Copyright (C) 2003 Motorola
7 * Modified by Xianghua Xiao(x.xiao@motorola.com)
9 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
11 * Modified by Cort Dougan (cort@cs.nmt.edu)
12 * and Paul Mackerras (paulus@cs.anu.edu.au)
15 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
19 * This file handles the architecture-dependent parts of hardware exceptions
23 #include <asm/ptrace.h>
28 #include <asm/processor.h>
30 DECLARE_GLOBAL_DATA_PTR;
32 /* Returns 0 if exception not found and fixup otherwise. */
33 extern unsigned long search_exception_table(unsigned long);
36 * End of addressable memory. This may be less than the actual
37 * amount of memory on the system if we're unable to keep all
38 * the memory mapped in.
40 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
42 static __inline__ void set_tsr(unsigned long val)
44 asm volatile("mtspr 0x150, %0" : : "r" (val));
47 static __inline__ unsigned long get_esr(void)
50 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
54 #define ESR_MCI 0x80000000
55 #define ESR_PIL 0x08000000
56 #define ESR_PPR 0x04000000
57 #define ESR_PTR 0x02000000
58 #define ESR_DST 0x00800000
59 #define ESR_DIZ 0x00400000
60 #define ESR_U0F 0x00008000
62 #if defined(CONFIG_CMD_BEDBUG)
63 extern void do_bedbug_breakpoint(struct pt_regs *);
67 * Trap & Exception support
70 static void print_backtrace(unsigned long *sp)
75 printf("Call backtrace: ");
77 if ((uint)sp > END_OF_MEM)
85 sp = (unsigned long *)*sp;
90 void show_regs(struct pt_regs *regs)
94 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
95 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
96 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
97 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
98 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
99 regs->msr&MSR_IR ? 1 : 0,
100 regs->msr&MSR_DR ? 1 : 0);
103 for (i = 0; i < 32; i++) {
106 printf("GPR%02d: ", i);
109 printf("%08lX ", regs->gpr[i]);
118 static void _exception(int signr, struct pt_regs *regs)
121 print_backtrace((unsigned long *)regs->gpr[1]);
122 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
125 void CritcalInputException(struct pt_regs *regs)
127 panic("Critical Input Exception");
130 int machinecheck_count = 0;
131 int machinecheck_error = 0;
132 void MachineCheckException(struct pt_regs *regs)
135 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
137 /* Probing PCI using config cycles cause this exception
138 * when a device is not present. Catch it and return to
139 * the PCI exception handler.
141 if ((fixup = search_exception_table(regs->nip)) != 0) {
146 mcsrr0 = mfspr(SPRN_MCSRR0);
147 mcsrr1 = mfspr(SPRN_MCSRR1);
148 mcsr = mfspr(SPRN_MCSR);
149 mcar = mfspr(SPRN_MCAR);
151 machinecheck_count++;
152 machinecheck_error=1;
154 #if defined(CONFIG_CMD_KGDB)
155 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
159 printf("Machine check in kernel mode.\n");
160 printf("Caused by (from mcsr): ");
161 printf("mcsr = 0x%08x\n", mcsr);
162 if (mcsr & 0x80000000)
163 printf("Machine check input pin\n");
164 if (mcsr & 0x40000000)
165 printf("Instruction cache parity error\n");
166 if (mcsr & 0x20000000)
167 printf("Data cache push parity error\n");
168 if (mcsr & 0x10000000)
169 printf("Data cache parity error\n");
170 if (mcsr & 0x00000080)
171 printf("Bus instruction address error\n");
172 if (mcsr & 0x00000040)
173 printf("Bus Read address error\n");
174 if (mcsr & 0x00000020)
175 printf("Bus Write address error\n");
176 if (mcsr & 0x00000010)
177 printf("Bus Instruction data bus error\n");
178 if (mcsr & 0x00000008)
179 printf("Bus Read data bus error\n");
180 if (mcsr & 0x00000004)
181 printf("Bus Write bus error\n");
182 if (mcsr & 0x00000002)
183 printf("Bus Instruction parity error\n");
184 if (mcsr & 0x00000001)
185 printf("Bus Read parity error\n");
188 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
189 mcsr, mcsrr0, mcsrr1, mcar);
190 print_backtrace((unsigned long *)regs->gpr[1]);
191 if (machinecheck_count > 10) {
192 panic("machine check count too high\n");
195 if (machinecheck_count > 1) {
196 regs->nip += 4; /* skip offending instruction */
197 printf("Skipping current instr, Returning to 0x%08lx\n",
200 printf("Returning back to 0x%08lx\n",regs->nip);
204 void AlignmentException(struct pt_regs *regs)
206 #if defined(CONFIG_CMD_KGDB)
207 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
212 print_backtrace((unsigned long *)regs->gpr[1]);
213 panic("Alignment Exception");
216 void ProgramCheckException(struct pt_regs *regs)
220 #if defined(CONFIG_CMD_KGDB)
221 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
228 if( esr_val & ESR_PIL )
229 printf( "** Illegal Instruction **\n" );
230 else if( esr_val & ESR_PPR )
231 printf( "** Privileged Instruction **\n" );
232 else if( esr_val & ESR_PTR )
233 printf( "** Trap Instruction **\n" );
235 print_backtrace((unsigned long *)regs->gpr[1]);
236 panic("Program Check Exception");
239 void PITException(struct pt_regs *regs)
242 * Reset PIT interrupt
247 * Call timer_interrupt routine in interrupts.c
249 timer_interrupt(NULL);
252 void UnknownException(struct pt_regs *regs)
254 #if defined(CONFIG_CMD_KGDB)
255 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
259 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
260 regs->nip, regs->msr, regs->trap);
264 void ExtIntException(struct pt_regs *regs)
266 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC8xxx_PIC_ADDR);
270 #if defined(CONFIG_CMD_KGDB)
271 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
275 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
276 regs->nip, regs->msr, regs->trap);
278 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
280 print_backtrace((unsigned long *)regs->gpr[1]);
283 void DebugException(struct pt_regs *regs)
285 printf("Debugger trap at @ %lx\n", regs->nip );
287 #if defined(CONFIG_CMD_BEDBUG)
288 do_bedbug_breakpoint( regs );