panic.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * linux/kernel/panic.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- */
- /*
- * This function is used through-out the kernel (including mm and fs)
- * to indicate a major problem.
- */
- #include <linux/config.h>
- #include <linux/sched.h>
- #include <linux/delay.h>
- #include <linux/reboot.h>
- #include <linux/notifier.h>
- #include <linux/init.h>
- #include <linux/sysrq.h>
- #include <linux/interrupt.h>
- asmlinkage void sys_sync(void); /* it's really int */
- int panic_timeout;
- struct notifier_block *panic_notifier_list;
- static int __init panic_setup(char *str)
- {
- panic_timeout = simple_strtoul(str, NULL, 0);
- return 1;
- }
- __setup("panic=", panic_setup);
- /**
- * panic - halt the system
- * @fmt: The text string to print
- *
- * Display a message, then perform cleanups. Functions in the panic
- * notifier list are called after the filesystem cache is flushed (when possible).
- *
- * This function never returns.
- */
-
- NORET_TYPE void panic(const char * fmt, ...)
- {
- static char buf[1024];
- va_list args;
- #if defined(CONFIG_ARCH_S390)
- unsigned long caller = (unsigned long) __builtin_return_address(0);
- #endif
- bust_spinlocks(1);
- va_start(args, fmt);
- vsprintf(buf, fmt, args);
- va_end(args);
- printk(KERN_EMERG "Kernel panic: %sn",buf);
- if (in_interrupt())
- printk(KERN_EMERG "In interrupt handler - not syncingn");
- else if (!current->pid)
- printk(KERN_EMERG "In idle task - not syncingn");
- else
- sys_sync();
- bust_spinlocks(0);
- #ifdef CONFIG_SMP
- smp_send_stop();
- #endif
- notifier_call_chain(&panic_notifier_list, 0, NULL);
- if (panic_timeout > 0)
- {
- /*
- * Delay timeout seconds before rebooting the machine.
- * We can't use the "normal" timers since we just panicked..
- */
- printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout);
- mdelay(panic_timeout*1000);
- /*
- * Should we run the reboot notifier. For the moment Im
- * choosing not too. It might crash, be corrupt or do
- * more harm than good for other reasons.
- */
- machine_restart(NULL);
- }
- #ifdef __sparc__
- {
- extern int stop_a_enabled;
- /* Make sure the user can actually press L1-A */
- stop_a_enabled = 1;
- printk("Press L1-A to return to the boot promn");
- }
- #endif
- #if defined(CONFIG_ARCH_S390)
- disabled_wait(caller);
- #endif
- sti();
- for(;;) {
- CHECK_EMERGENCY_SYNC
- }
- }
- /**
- * print_tainted - return a string to represent the kernel taint state.
- *
- * The string is overwritten by the next call to print_taint().
- */
-
- const char *print_tainted()
- {
- static char buf[20];
- if (tainted) {
- snprintf(buf, sizeof(buf), "Tainted: %c%c",
- tainted & 1 ? 'P' : 'G',
- tainted & 2 ? 'F' : ' ');
- }
- else
- snprintf(buf, sizeof(buf), "Not tainted");
- return(buf);
- }
- int tainted = 0;