2007-11-20 17:08:06 +08:00
|
|
|
#include <linux/bug.h>
|
|
|
|
#include <linux/io.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/kdebug.h>
|
2007-11-26 17:17:51 +08:00
|
|
|
#include <linux/signal.h>
|
|
|
|
#include <linux/sched.h>
|
2008-05-19 18:32:07 +08:00
|
|
|
#include <linux/uaccess.h>
|
2009-09-01 16:38:32 +08:00
|
|
|
#include <linux/hardirq.h>
|
2012-06-14 13:18:51 +08:00
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/kexec.h>
|
|
|
|
#include <linux/module.h>
|
2009-08-22 04:28:25 +08:00
|
|
|
#include <asm/unwinder.h>
|
2012-03-29 01:30:03 +08:00
|
|
|
#include <asm/traps.h>
|
2007-11-20 17:08:06 +08:00
|
|
|
|
2012-06-14 13:18:51 +08:00
|
|
|
static DEFINE_SPINLOCK(die_lock);
|
|
|
|
|
|
|
|
void die(const char *str, struct pt_regs *regs, long err)
|
|
|
|
{
|
|
|
|
static int die_counter;
|
|
|
|
|
|
|
|
oops_enter();
|
|
|
|
|
|
|
|
spin_lock_irq(&die_lock);
|
|
|
|
console_verbose();
|
|
|
|
bust_spinlocks(1);
|
|
|
|
|
|
|
|
printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
|
|
|
|
print_modules();
|
|
|
|
show_regs(regs);
|
|
|
|
|
|
|
|
printk("Process: %s (pid: %d, stack limit = %p)\n", current->comm,
|
|
|
|
task_pid_nr(current), task_stack_page(current) + 1);
|
|
|
|
|
|
|
|
if (!user_mode(regs) || in_interrupt())
|
|
|
|
dump_mem("Stack: ", regs->regs[15], THREAD_SIZE +
|
|
|
|
(unsigned long)task_stack_page(current));
|
|
|
|
|
|
|
|
notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV);
|
|
|
|
|
|
|
|
bust_spinlocks(0);
|
|
|
|
add_taint(TAINT_DIE);
|
|
|
|
spin_unlock_irq(&die_lock);
|
|
|
|
oops_exit();
|
|
|
|
|
|
|
|
if (kexec_should_crash(current))
|
|
|
|
crash_kexec(regs);
|
|
|
|
|
|
|
|
if (in_interrupt())
|
|
|
|
panic("Fatal exception in interrupt");
|
|
|
|
|
|
|
|
if (panic_on_oops)
|
|
|
|
panic("Fatal exception");
|
|
|
|
|
|
|
|
do_exit(SIGSEGV);
|
|
|
|
}
|
|
|
|
|
|
|
|
void die_if_kernel(const char *str, struct pt_regs *regs, long err)
|
|
|
|
{
|
|
|
|
if (!user_mode(regs))
|
|
|
|
die(str, regs, err);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* try and fix up kernelspace address errors
|
|
|
|
* - userspace errors just cause EFAULT to be returned, resulting in SEGV
|
|
|
|
* - kernel/userspace interfaces cause a jump to an appropriate handler
|
|
|
|
* - other kernel errors are bad
|
|
|
|
*/
|
|
|
|
void die_if_no_fixup(const char *str, struct pt_regs *regs, long err)
|
|
|
|
{
|
|
|
|
if (!user_mode(regs)) {
|
|
|
|
const struct exception_table_entry *fixup;
|
|
|
|
fixup = search_exception_tables(regs->pc);
|
|
|
|
if (fixup) {
|
|
|
|
regs->pc = fixup->fixup;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
die(str, regs, err);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-11-12 15:39:47 +08:00
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
|
|
static void handle_BUG(struct pt_regs *regs)
|
2007-11-20 17:08:06 +08:00
|
|
|
{
|
2009-08-22 04:28:25 +08:00
|
|
|
const struct bug_entry *bug;
|
|
|
|
unsigned long bugaddr = regs->pc;
|
2007-11-20 17:08:06 +08:00
|
|
|
enum bug_trap_type tt;
|
2009-08-22 04:28:25 +08:00
|
|
|
|
|
|
|
if (!is_valid_bugaddr(bugaddr))
|
|
|
|
goto invalid;
|
|
|
|
|
|
|
|
bug = find_bug(bugaddr);
|
|
|
|
|
|
|
|
/* Switch unwinders when unwind_stack() is called */
|
|
|
|
if (bug->flags & BUGFLAG_UNWINDER)
|
|
|
|
unwinder_faulted = 1;
|
|
|
|
|
|
|
|
tt = report_bug(bugaddr, regs);
|
2007-11-20 17:08:06 +08:00
|
|
|
if (tt == BUG_TRAP_TYPE_WARN) {
|
2009-08-22 04:28:25 +08:00
|
|
|
regs->pc += instruction_size(bugaddr);
|
2007-11-20 17:08:06 +08:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2009-08-22 04:28:25 +08:00
|
|
|
invalid:
|
2007-11-20 17:08:06 +08:00
|
|
|
die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
|
|
|
|
}
|
|
|
|
|
|
|
|
int is_valid_bugaddr(unsigned long addr)
|
|
|
|
{
|
2009-05-09 15:02:08 +08:00
|
|
|
insn_size_t opcode;
|
2008-05-19 18:32:07 +08:00
|
|
|
|
|
|
|
if (addr < PAGE_OFFSET)
|
|
|
|
return 0;
|
2009-05-09 15:02:08 +08:00
|
|
|
if (probe_kernel_address((insn_size_t *)addr, opcode))
|
2008-05-19 18:32:07 +08:00
|
|
|
return 0;
|
2009-08-22 04:28:25 +08:00
|
|
|
if (opcode == TRAPA_BUG_OPCODE)
|
2009-08-17 04:54:48 +08:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
2007-11-20 17:08:06 +08:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Generic trap handler.
|
|
|
|
*/
|
|
|
|
BUILD_TRAP_HANDLER(debug)
|
|
|
|
{
|
|
|
|
TRAP_HANDLER_DECL;
|
|
|
|
|
|
|
|
/* Rewind */
|
2010-01-26 11:58:40 +08:00
|
|
|
regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
|
2007-11-20 17:08:06 +08:00
|
|
|
|
|
|
|
if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
|
|
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
|
|
return;
|
|
|
|
|
|
|
|
force_sig(SIGTRAP, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Special handler for BUG() traps.
|
|
|
|
*/
|
|
|
|
BUILD_TRAP_HANDLER(bug)
|
|
|
|
{
|
|
|
|
TRAP_HANDLER_DECL;
|
|
|
|
|
|
|
|
/* Rewind */
|
2010-01-26 11:58:40 +08:00
|
|
|
regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
|
2007-11-20 17:08:06 +08:00
|
|
|
|
|
|
|
if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
|
|
|
|
SIGTRAP) == NOTIFY_STOP)
|
|
|
|
return;
|
|
|
|
|
2009-11-12 15:39:47 +08:00
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
2007-11-20 17:08:06 +08:00
|
|
|
if (__kernel_text_address(instruction_pointer(regs))) {
|
2009-05-09 15:02:08 +08:00
|
|
|
insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
|
2007-11-20 17:08:06 +08:00
|
|
|
if (insn == TRAPA_BUG_OPCODE)
|
|
|
|
handle_BUG(regs);
|
2009-06-17 12:48:20 +08:00
|
|
|
return;
|
2007-11-20 17:08:06 +08:00
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
force_sig(SIGTRAP, current);
|
|
|
|
}
|
2009-09-01 16:38:32 +08:00
|
|
|
|
|
|
|
BUILD_TRAP_HANDLER(nmi)
|
|
|
|
{
|
2009-10-14 15:42:28 +08:00
|
|
|
unsigned int cpu = smp_processor_id();
|
2009-09-01 16:38:32 +08:00
|
|
|
TRAP_HANDLER_DECL;
|
|
|
|
|
|
|
|
nmi_enter();
|
2009-10-14 15:42:28 +08:00
|
|
|
nmi_count(cpu)++;
|
2009-09-01 16:38:32 +08:00
|
|
|
|
|
|
|
switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
|
|
|
|
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. Ignoring...\n");
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
nmi_exit();
|
|
|
|
}
|