path: root/arch/powerpc/kernel/traps.c

/*
 *  Copyright (C) 1995-1996  Gary Thomas (gdt@linuxppc.org)
 *
 *  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.
 *
 *  Modified by Cort Dougan (cort@cs.nmt.edu)
 *  and Paul Mackerras (paulus@samba.org)
 */

/*
 * This file handles the architecture-dependent parts of hardware exceptions
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/prctl.h>
#include <linux/delay.h>
#include <linux/kprobes.h>
#include <linux/kexec.h>

#include <asm/kdebug.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/pmc.h>
#ifdef CONFIG_PPC32
#include <asm/reg.h>
#endif
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif
#ifdef CONFIG_PPC64
#include <asm/firmware.h>
#include <asm/processor.h>
#endif

#ifdef CONFIG_PPC64	/* XXX */
#define _IO_BASE	pci_io_base
#endif

#ifdef CONFIG_DEBUGGER
int (*__debugger)(struct pt_regs *regs);
int (*__debugger_ipi)(struct pt_regs *regs);
int (*__debugger_bpt)(struct pt_regs *regs);
int (*__debugger_sstep)(struct pt_regs *regs);
int (*__debugger_iabr_match)(struct pt_regs *regs);
int (*__debugger_dabr_match)(struct pt_regs *regs);
int (*__debugger_fault_handler)(struct pt_regs *regs);

EXPORT_SYMBOL(__debugger);
EXPORT_SYMBOL(__debugger_ipi);
EXPORT_SYMBOL(__debugger_bpt);
EXPORT_SYMBOL(__debugger_sstep);
EXPORT_SYMBOL(__debugger_iabr_match);
EXPORT_SYMBOL(__debugger_dabr_match);
EXPORT_SYMBOL(__debugger_fault_handler);
#endif

struct notifier_block *powerpc_die_chain;
static DEFINE_SPINLOCK(die_notifier_lock);

int register_die_notifier(struct notifier_block *nb)
{
	int err = 0;
	unsigned long flags;

	spin_lock_irqsave(&die_notifier_lock, flags);
	err = notifier_chain_register(&powerpc_die_chain, nb);
	spin_unlock_irqrestore(&die_notifier_lock, flags);
	return err;
}

/*
 * Trap & Exception support
 */

static DEFINE_SPINLOCK(die_lock);

int die(const char *str, struct pt_regs *regs, long err)
{
	static int die_counter, crash_dump_start = 0;
	int nl = 0;

	if (debugger(regs))
		return 1;

	console_verbose();
	spin_lock_irq(&die_lock);
	bust_spinlocks(1);
#ifdef CONFIG_PMAC_BACKLIGHT
	if (_machine == _MACH_Pmac) {
		set_backlight_enable(1);
		set_backlight_level(BACKLIGHT_MAX);
	}
#endif
	printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
#ifdef CONFIG_PREEMPT
	printk("PREEMPT ");
	nl = 1;
#endif
#ifdef CONFIG_SMP
	printk("SMP NR_CPUS=%d ", NR_CPUS);
	nl = 1;
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
	printk("DEBUG_PAGEALLOC ");
	nl = 1;
#endif
#ifdef CONFIG_NUMA
	printk("NUMA ");
	nl = 1;
#endif
#ifdef CONFIG_PPC64
	switch (_machine) {
	case PLATFORM_PSERIES:
		printk("PSERIES ");
		nl = 1;
		break;
	case PLATFORM_PSERIES_LPAR:
		printk("PSERIES LPAR ");
		nl = 1;
		break;
	case PLATFORM_ISERIES_LPAR:
		printk("ISERIES LPAR ");
		nl = 1;
		break;
	case PLATFORM_POWERMAC:
		printk("POWERMAC ");
		nl = 1;
		break;
	case PLATFORM_CELL:
		printk("CELL ");
		nl = 1;
		break;
	}
#endif
	if (nl)
		printk("\n");
	print_modules();
	show_regs(regs);
	bust_spinlocks(0);

	if (!crash_dump_start && kexec_should_crash(current)) {
		crash_dump_start = 1;
		<