2 * linux/arch/powerpc/kernel/traps.c
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 * SPDX-License-Identifier: GPL-2.0+
16 * This file handles the architecture-dependent parts of hardware exceptions
22 #include <asm/processor.h>
24 #if defined(CONFIG_CMD_BEDBUG)
25 extern void do_bedbug_breakpoint(struct pt_regs *);
28 /* Returns 0 if exception not found and fixup otherwise. */
29 extern unsigned long search_exception_table(unsigned long);
31 /* THIS NEEDS CHANGING to use the board info structure.
33 #define END_OF_MEM 0x0001000
37 * Print stack backtrace
39 static void print_backtrace(unsigned long *sp)
44 printf("Call backtrace: ");
46 if ((uint)sp > END_OF_MEM)
54 sp = (unsigned long *)*sp;
60 * Print current registers
62 void show_regs(struct pt_regs *regs)
65 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
66 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
67 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
68 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
69 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
70 regs->msr&MSR_IR ? 1 : 0,
71 regs->msr&MSR_DR ? 1 : 0);
74 for (i = 0; i < 32; i++) {
77 printf("GPR%02d: ", i);
80 printf("%08lX ", regs->gpr[i]);
90 * General exception handler routine
92 static void _exception(int signr, struct pt_regs *regs)
95 print_backtrace((unsigned long *)regs->gpr[1]);
96 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
100 * Machine check exception handler routine
102 void MachineCheckException(struct pt_regs *regs)
106 /* Probing PCI using config cycles cause this exception
107 * when a device is not present. Catch it and return to
108 * the PCI exception handler.
110 if ((fixup = search_exception_table(regs->nip)) != 0) {
115 #if defined(CONFIG_CMD_KGDB)
116 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
120 printf("Machine check in kernel mode.\n");
121 printf("Caused by (from msr): ");
122 printf("regs %p ",regs);
123 switch( regs->msr & 0x000F0000) {
124 case (0x80000000>>12):
125 printf("Machine check signal\n");
127 case (0x80000000>>13):
128 printf("Transfer error ack signal\n");
130 case (0x80000000>>14):
131 printf("Data parity signal\n");
133 case (0x80000000>>15):
134 printf("Address parity signal\n");
137 printf("Unknown values in msr\n");
140 print_backtrace((unsigned long *)regs->gpr[1]);
141 panic("machine check");
145 * Alignment exception handler routine
147 void AlignmentException(struct pt_regs *regs)
149 #if defined(CONFIG_CMD_KGDB)
150 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
154 print_backtrace((unsigned long *)regs->gpr[1]);
155 panic("Alignment Exception");
159 * Program check exception handler routine
161 void ProgramCheckException(struct pt_regs *regs)
163 #if defined(CONFIG_CMD_KGDB)
164 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
168 print_backtrace((unsigned long *)regs->gpr[1]);
169 panic("Program Check Exception");
173 * Software emulation exception handler routine
175 void SoftEmuException(struct pt_regs *regs)
177 #if defined(CONFIG_CMD_KGDB)
178 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
182 print_backtrace((unsigned long *)regs->gpr[1]);
183 panic("Software Emulation Exception");
188 * Unknown exception handler routine
190 void UnknownException(struct pt_regs *regs)
192 #if defined(CONFIG_CMD_KGDB)
193 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
196 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
197 regs->nip, regs->msr, regs->trap);
202 * Debug exception handler routine
204 void DebugException(struct pt_regs *regs)
206 printf("Debugger trap at @ %lx\n", regs->nip );
208 #if defined(CONFIG_CMD_BEDBUG)
209 do_bedbug_breakpoint( regs );