| /* |
| * 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/module.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> |
| #include <linux/nmi.h> |
| #include <linux/kexec.h> |
| |
| int panic_timeout; |
| int panic_on_oops; |
| int tainted; |
| |
| EXPORT_SYMBOL(panic_timeout); |
| |
| struct notifier_block *panic_notifier_list; |
| |
| EXPORT_SYMBOL(panic_notifier_list); |
| |
| static int __init panic_setup(char *str) |
| { |
| panic_timeout = simple_strtoul(str, NULL, 0); |
| return 1; |
| } |
| __setup("panic=", panic_setup); |
| |
| static long no_blink(long time) |
| { |
| return 0; |
| } |
| |
| /* Returns how long it waited in ms */ |
| long (*panic_blink)(long time); |
| EXPORT_SYMBOL(panic_blink); |
| |
| /** |
| * panic - halt the system |
| * @fmt: The text string to print |
| * |
| * Display a message, then perform cleanups. |
| * |
| * This function never returns. |
| */ |
| |
| NORET_TYPE void panic(const char * fmt, ...) |
| { |
| long i; |
| static char buf[1024]; |
| va_list args; |
| #if defined(CONFIG_ARCH_S390) |
| unsigned long caller = (unsigned long) __builtin_return_address(0); |
| #endif |
| |
| /* |
| * It's possible to come here directly from a panic-assertion and not |
| * have preempt disabled. Some functions called from here want |
| * preempt to be disabled. No point enabling it later though... |
| */ |
| preempt_disable(); |
| |
| bust_spinlocks(1); |
| va_start(args, fmt); |
| vsnprintf(buf, sizeof(buf), fmt, args); |
| va_end(args); |
| printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); |
| bust_spinlocks(0); |
| |
| /* |
| * If we have crashed and we have a crash kernel loaded let it handle |
| * everything else. |
| * Do we want to call this before we try to display a message? |
| */ |
| crash_kexec(NULL); |
| |
| #ifdef CONFIG_SMP |
| /* |
| * Note smp_send_stop is the usual smp shutdown function, which |
| * unfortunately means it may not be hardened to work in a panic |
| * situation. |
| */ |
| smp_send_stop(); |
| #endif |
| |
| notifier_call_chain(&panic_notifier_list, 0, buf); |
| |
| if (!panic_blink) |
| panic_blink = no_blink; |
| |
| 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); |
| for (i = 0; i < panic_timeout*1000; ) { |
| touch_nmi_watchdog(); |
| i += panic_blink(i); |
| mdelay(1); |
| i++; |
| } |
| /* This will not be a clean reboot, with everything |
| * shutting down. But if there is a chance of |
| * rebooting the system it will be rebooted. |
| */ |
| emergency_restart(); |
| } |
| #ifdef __sparc__ |
| { |
| extern int stop_a_enabled; |
| /* Make sure the user can actually press Stop-A (L1-A) */ |
| stop_a_enabled = 1; |
| printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n"); |
| } |
| #endif |
| #if defined(CONFIG_ARCH_S390) |
| disabled_wait(caller); |
| #endif |
| local_irq_enable(); |
| for (i = 0;;) { |
| i += panic_blink(i); |
| mdelay(1); |
| i++; |
| } |
| } |
| |
| EXPORT_SYMBOL(panic); |
| |
| /** |
| * print_tainted - return a string to represent the kernel taint state. |
| * |
| * 'P' - Proprietary module has been loaded. |
| * 'F' - Module has been forcibly loaded. |
| * 'S' - SMP with CPUs not designed for SMP. |
| * 'R' - User forced a module unload. |
| * 'M' - Machine had a machine check experience. |
| * 'B' - System has hit bad_page. |
| * |
| * The string is overwritten by the next call to print_taint(). |
| */ |
| |
| const char *print_tainted(void) |
| { |
| static char buf[20]; |
| if (tainted) { |
| snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c", |
| tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G', |
| tainted & TAINT_FORCED_MODULE ? 'F' : ' ', |
| tainted & TAINT_UNSAFE_SMP ? 'S' : ' ', |
| tainted & TAINT_FORCED_RMMOD ? 'R' : ' ', |
| tainted & TAINT_MACHINE_CHECK ? 'M' : ' ', |
| tainted & TAINT_BAD_PAGE ? 'B' : ' '); |
| } |
| else |
| snprintf(buf, sizeof(buf), "Not tainted"); |
| return(buf); |
| } |
| |
| void add_taint(unsigned flag) |
| { |
| tainted |= flag; |
| } |
| EXPORT_SYMBOL(add_taint); |