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* linux/arch/ppc/kernel/traps.c
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au)
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* fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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* See file CREDITS for list of people who contributed to this
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* This file handles the architecture-dependent parts of hardware exceptions
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#include <asm/processor.h>
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table (unsigned long);
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/* THIS NEEDS CHANGING to use the board info structure.
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#define END_OF_MEM 0x02000000
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* Trap & Exception support
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void print_backtrace (unsigned long *sp)
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printf ("Call backtrace: ");
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if ((uint) sp > END_OF_MEM)
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sp = (unsigned long *) *sp;
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void show_regs (struct pt_regs *regs)
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printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
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regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
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printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
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regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
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regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
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regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
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for (i = 0; i < 32; i++) {
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printf ("GPR%02d: ", i);
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printf ("%08lX ", regs->gpr[i]);
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void _exception (int signr, struct pt_regs *regs)
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print_backtrace ((unsigned long *) regs->gpr[1]);
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panic ("Exception in kernel pc %lx signal %d", regs->nip, signr);
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void MachineCheckException (struct pt_regs *regs)
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/* Probing PCI using config cycles cause this exception
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* when a device is not present. Catch it and return to
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* the PCI exception handler.
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if ((fixup = search_exception_table (regs->nip)) != 0) {
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler
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&& (*debugger_exception_handler) (regs))
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printf ("Machine check in kernel mode.\n");
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printf ("Caused by (from msr): ");
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printf ("regs %p ", regs);
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/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
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switch (regs->msr & 0x000F0000) {
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case (0x80000000 >> 12):
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printf ("Machine check signal - probably due to mm fault\n"
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case (0x80000000 >> 13):
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printf ("Transfer error ack signal\n");
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case (0x80000000 >> 14):
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printf ("Data parity signal\n");
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case (0x80000000 >> 15):
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printf ("Address parity signal\n");
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printf ("Unknown values in msr\n");
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print_backtrace ((unsigned long *) regs->gpr[1]);
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panic ("machine check");
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void AlignmentException (struct pt_regs *regs)
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler
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&& (*debugger_exception_handler) (regs))
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print_backtrace ((unsigned long *) regs->gpr[1]);
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panic ("Alignment Exception");
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void ProgramCheckException (struct pt_regs *regs)
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler
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&& (*debugger_exception_handler) (regs))
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print_backtrace ((unsigned long *) regs->gpr[1]);
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panic ("Program Check Exception");
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void SoftEmuException (struct pt_regs *regs)
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler
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&& (*debugger_exception_handler) (regs))
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print_backtrace ((unsigned long *) regs->gpr[1]);
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panic ("Software Emulation Exception");
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void UnknownException (struct pt_regs *regs)
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler
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&& (*debugger_exception_handler) (regs))
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printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
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regs->nip, regs->msr, regs->trap);
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_exception (0, regs);
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#if defined(CONFIG_CMD_BEDBUG)
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extern void do_bedbug_breakpoint (struct pt_regs *);
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void DebugException (struct pt_regs *regs)
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printf ("Debugger trap at @ %lx\n", regs->nip);
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#if defined(CONFIG_CMD_BEDBUG)
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do_bedbug_breakpoint (regs);
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/* Probe an address by reading. If not present, return -1, otherwise
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int addr_probe (uint * addr)
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__asm__ __volatile__ ("1: lwz %0,0(%1)\n"
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".section .fixup,\"ax\"\n"
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".section __ex_table,\"a\"\n"
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".text":"=r" (retval):"r" (addr));