mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
373d4d0997
Fix up all callers as they were before, with make one change: an unsigned module taints the kernel, but doesn't turn off lockdep. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
262 lines
5.4 KiB
C
262 lines
5.4 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/hardirq.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kdebug.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 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",
|
|
str, err, ++die_counter);
|
|
|
|
printk(KERN_EMERG);
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
printk(KERN_CONT "PREEMPT ");
|
|
#endif
|
|
#ifdef CONFIG_FRAME_POINTER
|
|
printk(KERN_CONT "FRAME_POINTER ");
|
|
#endif
|
|
if (current_cpu_data.features & AVR32_FEATURE_OCD) {
|
|
unsigned long did = ocd_read(DID);
|
|
printk(KERN_CONT "chip: 0x%03lx:0x%04lx rev %lu\n",
|
|
(did >> 1) & 0x7ff,
|
|
(did >> 12) & 0x7fff,
|
|
(did >> 28) & 0xf);
|
|
} else {
|
|
printk(KERN_CONT "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, LOCKDEP_NOW_UNRELIABLE);
|
|
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)) {
|
|
const struct exception_table_entry *fixup;
|
|
|
|
/* Are we prepared to handle this kernel fault? */
|
|
fixup = search_exception_tables(regs->pc);
|
|
if (fixup) {
|
|
regs->pc = fixup->fixup;
|
|
return;
|
|
}
|
|
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);
|
|
}
|
|
|
|
asmlinkage void do_nmi(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
int ret;
|
|
|
|
nmi_enter();
|
|
|
|
ret = notify_die(DIE_NMI, "NMI", regs, 0, ecr, SIGINT);
|
|
switch (ret) {
|
|
case NOTIFY_OK:
|
|
case NOTIFY_STOP:
|
|
break;
|
|
case NOTIFY_BAD:
|
|
die("Fatal Non-Maskable Interrupt", regs, SIGINT);
|
|
default:
|
|
printk(KERN_ALERT "Got NMI, but nobody cared. Disabling...\n");
|
|
nmi_disable();
|
|
break;
|
|
}
|
|
nmi_exit();
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_BUG
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
asmlinkage void do_illegal_opcode(unsigned long ecr, struct pt_regs *regs)
|
|
{
|
|
u32 insn;
|
|
struct undef_hook *hook;
|
|
void __user *pc;
|
|
long code;
|
|
|
|
#ifdef CONFIG_BUG
|
|
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);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
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)
|
|
{
|
|
|
|
}
|