kernel_optimize_test/arch/avr32/kernel/traps.c
Pavel Emelianov bcdcd8e725 Report that kernel is tainted if there was an OOPS
If the kernel OOPSed or BUGed then it probably should be considered as
tainted.  Thus, all subsequent OOPSes and SysRq dumps will report the
tainted kernel.  This saves a lot of time explaining oddities in the
calltraces.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Added parisc patch from Matthew Wilson  -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00

252 lines
5.6 KiB
C

/*
* Copyright (C) 2004-2006 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/kallsyms.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <asm/addrspace.h>
#include <asm/mmu_context.h>
#include <asm/ocd.h>
#include <asm/sysreg.h>
#include <asm/traps.h>
static DEFINE_SPINLOCK(die_lock);
void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
{
static int die_counter;
console_verbose();
spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk(KERN_ALERT "Oops: %s, sig: %ld [#%d]\n" KERN_EMERG,
str, err, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
#ifdef CONFIG_FRAME_POINTER
printk("FRAME_POINTER ");
#endif
if (current_cpu_data.features & AVR32_FEATURE_OCD) {
unsigned long did = __mfdr(DBGREG_DID);
printk("chip: 0x%03lx:0x%04lx rev %lu\n",
(did >> 1) & 0x7ff,
(did >> 12) & 0x7fff,
(did >> 28) & 0xf);
} else {
printk("cpu: arch %u r%u / core %u r%u\n",
current_cpu_data.arch_type,
current_cpu_data.arch_revision,
current_cpu_data.cpu_type,
current_cpu_data.cpu_revision);
}
print_modules();
show_regs_log_lvl(regs, KERN_EMERG);
show_stack_log_lvl(current, regs->sp, regs, KERN_EMERG);
bust_spinlocks(0);
add_taint(TAINT_DIE);
spin_unlock_irq(&die_lock);
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
do_exit(err);
}
void _exception(long signr, struct pt_regs *regs, int code,
unsigned long addr)
{
siginfo_t info;
if (!user_mode(regs))
die("Unhandled exception in kernel mode", regs, signr);
memset(&info, 0, sizeof(info));
info.si_signo = signr;
info.si_code = code;
info.si_addr = (void __user *)addr;
force_sig_info(signr, &info, current);
/*
* Init gets no signals that it doesn't have a handler for.
* That's all very well, but if it has caused a synchronous
* exception and we ignore the resulting signal, it will just
* generate the same exception over and over again and we get
* nowhere. Better to kill it and let the kernel panic.
*/
if (is_init(current)) {
__sighandler_t handler;
spin_lock_irq(&current->sighand->siglock);
handler = current->sighand->action[signr-1].sa.sa_handler;
spin_unlock_irq(&current->sighand->siglock);
if (handler == SIG_DFL) {
/* init has generated a synchronous exception
and it doesn't have a handler for the signal */
printk(KERN_CRIT "init has generated signal %ld "
"but has no handler for it\n", signr);
do_exit(signr);
}
}
}
asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
{
printk(KERN_ALERT "Got Non-Maskable Interrupt, dumping regs\n");
show_regs_log_lvl(regs, KERN_ALERT);
show_stack_log_lvl(current, regs->sp, regs, KERN_ALERT);
}
asmlinkage void do_critical_exception(unsigned long ecr, struct pt_regs *regs)
{
die("Critical exception", regs, SIGKILL);
}
asmlinkage void do_address_exception(unsigned long ecr, struct pt_regs *regs)
{
_exception(SIGBUS, regs, BUS_ADRALN, regs->pc);
}
/* This way of handling undefined instructions is stolen from ARM */
static LIST_HEAD(undef_hook);
static DEFINE_SPINLOCK(undef_lock);
void register_undef_hook(struct undef_hook *hook)
{
spin_lock_irq(&undef_lock);
list_add(&hook->node, &undef_hook);
spin_unlock_irq(&undef_lock);
}
void unregister_undef_hook(struct undef_hook *hook)
{
spin_lock_irq(&undef_lock);
list_del(&hook->node);
spin_unlock_irq(&undef_lock);
}
static int do_cop_absent(u32 insn)
{
int cop_nr;
u32 cpucr;
if ((insn & 0xfdf00000) == 0xf1900000)
/* LDC0 */
cop_nr = 0;
else
cop_nr = (insn >> 13) & 0x7;
/* Try enabling the coprocessor */
cpucr = sysreg_read(CPUCR);
cpucr |= (1 << (24 + cop_nr));
sysreg_write(CPUCR, cpucr);
cpucr = sysreg_read(CPUCR);
if (!(cpucr & (1 << (24 + cop_nr))))
return -ENODEV;
return 0;
}
int is_valid_bugaddr(unsigned long pc)
{
unsigned short opcode;
if (pc < PAGE_OFFSET)
return 0;
if (probe_kernel_address((u16 *)pc, opcode))
return 0;
return opcode == AVR32_BUG_OPCODE;
}
asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
{
u32 insn;
struct undef_hook *hook;
void __user *pc;
long code;
if (!user_mode(regs) && (ecr == ECR_ILLEGAL_OPCODE)) {
enum bug_trap_type type;
type = report_bug(regs->pc, regs);
switch (type) {
case BUG_TRAP_TYPE_NONE:
break;
case BUG_TRAP_TYPE_WARN:
regs->pc += 2;
return;
case BUG_TRAP_TYPE_BUG:
die("Kernel BUG", regs, SIGKILL);
}
}
local_irq_enable();
if (user_mode(regs)) {
pc = (void __user *)instruction_pointer(regs);
if (get_user(insn, (u32 __user *)pc))
goto invalid_area;
if (ecr == ECR_COPROC_ABSENT && !do_cop_absent(insn))
return;
spin_lock_irq(&undef_lock);
list_for_each_entry(hook, &undef_hook, node) {
if ((insn & hook->insn_mask) == hook->insn_val) {
if (hook->fn(regs, insn) == 0) {
spin_unlock_irq(&undef_lock);
return;
}
}
}
spin_unlock_irq(&undef_lock);
}
switch (ecr) {
case ECR_PRIVILEGE_VIOLATION:
code = ILL_PRVOPC;
break;
case ECR_COPROC_ABSENT:
code = ILL_COPROC;
break;
default:
code = ILL_ILLOPC;
break;
}
_exception(SIGILL, regs, code, regs->pc);
return;
invalid_area:
_exception(SIGSEGV, regs, SEGV_MAPERR, regs->pc);
}
asmlinkage void do_fpe(unsigned long ecr, struct pt_regs *regs)
{
/* We have no FPU yet */
_exception(SIGILL, regs, ILL_COPROC, regs->pc);
}
void __init trap_init(void)
{
}