diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc8220/traps.c')
| -rw-r--r-- | arch/powerpc/cpu/mpc8220/traps.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc8220/traps.c b/arch/powerpc/cpu/mpc8220/traps.c new file mode 100644 index 000000000..13894c905 --- /dev/null +++ b/arch/powerpc/cpu/mpc8220/traps.c @@ -0,0 +1,236 @@ +/* + * linux/arch/powerpc/kernel/traps.c + * + * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) + * + * Modified by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras (paulus@cs.anu.edu.au) + * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de) + * + * (C) Copyright 2000-2003 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * This file handles the architecture-dependent parts of hardware exceptions + */ + +#include <common.h> +#include <command.h> +#include <kgdb.h> +#include <asm/processor.h> + +/* Returns 0 if exception not found and fixup otherwise. */ +extern unsigned long search_exception_table (unsigned long); + +/* THIS NEEDS CHANGING to use the board info structure. +*/ +#define END_OF_MEM 0x02000000 + +/* + * Trap & Exception support + */ + +void print_backtrace (unsigned long *sp) +{ + int cnt = 0; + unsigned long i; + + printf ("Call backtrace: "); + while (sp) { + if ((uint) sp > END_OF_MEM) + break; + + i = sp[1]; + if (cnt++ % 7 == 0) + printf ("\n"); + printf ("%08lX ", i); + if (cnt > 32) + break; + sp = (unsigned long *) *sp; + } + printf ("\n"); +} + +void show_regs (struct pt_regs *regs) +{ + int i; + + printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n", + regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); + printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n", + regs->msr, + regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0, + regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0, + regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0); + + printf ("\n"); + for (i = 0; i < 32; i++) { + if ((i % 8) == 0) { + printf ("GPR%02d: ", i); + } + + printf ("%08lX ", regs->gpr[i]); + if ((i % 8) == 7) { + printf ("\n"); + } + } +} + + +void _exception (int signr, struct pt_regs *regs) +{ + show_regs (regs); + print_backtrace ((unsigned long *) regs->gpr[1]); + panic ("Exception in kernel pc %lx signal %d", regs->nip, signr); +} + +void MachineCheckException (struct pt_regs *regs) +{ + unsigned long fixup; + + /* Probing PCI using config cycles cause this exception + * when a device is not present. Catch it and return to + * the PCI exception handler. + */ + if ((fixup = search_exception_table (regs->nip)) != 0) { + regs->nip = fixup; + return; + } +#if defined(CONFIG_CMD_KGDB) + if (debugger_exception_handler + && (*debugger_exception_handler) (regs)) + return; +#endif + + printf ("Machine check in kernel mode.\n"); + printf ("Caused by (from msr): "); + printf ("regs %p ", regs); + /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */ + switch (regs->msr & 0x000F0000) { + case (0x80000000 >> 12): + printf ("Machine check signal - probably due to mm fault\n" + "with mmu off\n"); + break; + case (0x80000000 >> 13): + printf ("Transfer error ack signal\n"); + break; + case (0x80000000 >> 14): + printf ("Data parity signal\n"); + break; + case (0x80000000 >> 15): + printf ("Address parity signal\n"); + break; + default: + printf ("Unknown values in msr\n"); + } + show_regs (regs); + print_backtrace ((unsigned long *) regs->gpr[1]); + panic ("machine check"); +} + +void AlignmentException (struct pt_regs *regs) +{ +#if defined(CONFIG_CMD_KGDB) + if (debugger_exception_handler + && (*debugger_exception_handler) (regs)) + return; +#endif + show_regs (regs); + print_backtrace ((unsigned long *) regs->gpr[1]); + panic ("Alignment Exception"); +} + +void ProgramCheckException (struct pt_regs *regs) +{ +#if defined(CONFIG_CMD_KGDB) + if (debugger_exception_handler + && (*debugger_exception_handler) (regs)) + return; +#endif + show_regs (regs); + print_backtrace ((unsigned long *) regs->gpr[1]); + panic ("Program Check Exception"); +} + +void SoftEmuException (struct pt_regs *regs) +{ +#if defined(CONFIG_CMD_KGDB) + if (debugger_exception_handler + && (*debugger_exception_handler) (regs)) + return; +#endif + show_regs (regs); + print_backtrace ((unsigned long *) regs->gpr[1]); + panic ("Software Emulation Exception"); +} + + +void UnknownException (struct pt_regs *regs) +{ +#if defined(CONFIG_CMD_KGDB) + if (debugger_exception_handler + && (*debugger_exception_handler) (regs)) + return; +#endif + printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", + regs->nip, regs->msr, regs->trap); + _exception (0, regs); +} + +#if defined(CONFIG_CMD_BEDBUG) +extern void do_bedbug_breakpoint (struct pt_regs *); +#endif + +void DebugException (struct pt_regs *regs) +{ + + printf ("Debugger trap at @ %lx\n", regs->nip); + show_regs (regs); +#if defined(CONFIG_CMD_BEDBUG) + do_bedbug_breakpoint (regs); +#endif +} + +/* Probe an address by reading. If not present, return -1, otherwise + * return 0. + */ +int addr_probe (uint * addr) +{ +#if 0 + int retval; + + __asm__ __volatile__ ("1: lwz %0,0(%1)\n" + " eieio\n" + " li %0,0\n" + "2:\n" + ".section .fixup,\"ax\"\n" + "3: li %0,-1\n" + " b 2b\n" + ".section __ex_table,\"a\"\n" + " .align 2\n" + " .long 1b,3b\n" + ".text":"=r" (retval):"r" (addr)); + + return (retval); +#endif + return 0; +} |