3 #include <linux/types.h>
4 #include <linux/kdebug.h>
5 #include <linux/signal.h>
6 #include <linux/sched.h>
7 #include <linux/uaccess.h>
8 #include <linux/hardirq.h>
9 #include <linux/kernel.h>
10 #include <linux/kexec.h>
11 #include <linux/module.h>
12 #include <asm/unwinder.h>
13 #include <asm/traps.h>
15 static DEFINE_SPINLOCK(die_lock);
17 void die(const char *str, struct pt_regs *regs, long err)
19 static int die_counter;
23 spin_lock_irq(&die_lock);
27 printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
31 printk("Process: %s (pid: %d, stack limit = %p)\n", current->comm,
32 task_pid_nr(current), task_stack_page(current) + 1);
34 if (!user_mode(regs) || in_interrupt())
35 dump_mem("Stack: ", regs->regs[15], THREAD_SIZE +
36 (unsigned long)task_stack_page(current));
38 notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV);
41 add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
42 spin_unlock_irq(&die_lock);
45 if (kexec_should_crash(current))
49 panic("Fatal exception in interrupt");
52 panic("Fatal exception");
57 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
64 * try and fix up kernelspace address errors
65 * - userspace errors just cause EFAULT to be returned, resulting in SEGV
66 * - kernel/userspace interfaces cause a jump to an appropriate handler
67 * - other kernel errors are bad
69 void die_if_no_fixup(const char *str, struct pt_regs *regs, long err)
71 if (!user_mode(regs)) {
72 const struct exception_table_entry *fixup;
73 fixup = search_exception_tables(regs->pc);
75 regs->pc = fixup->fixup;
83 #ifdef CONFIG_GENERIC_BUG
84 static void handle_BUG(struct pt_regs *regs)
86 const struct bug_entry *bug;
87 unsigned long bugaddr = regs->pc;
88 enum bug_trap_type tt;
90 if (!is_valid_bugaddr(bugaddr))
93 bug = find_bug(bugaddr);
95 /* Switch unwinders when unwind_stack() is called */
96 if (bug->flags & BUGFLAG_UNWINDER)
99 tt = report_bug(bugaddr, regs);
100 if (tt == BUG_TRAP_TYPE_WARN) {
101 regs->pc += instruction_size(bugaddr);
106 die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
109 int is_valid_bugaddr(unsigned long addr)
113 if (addr < PAGE_OFFSET)
115 if (probe_kernel_address((insn_size_t *)addr, opcode))
117 if (opcode == TRAPA_BUG_OPCODE)
125 * Generic trap handler.
127 BUILD_TRAP_HANDLER(debug)
132 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
134 if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
135 SIGTRAP) == NOTIFY_STOP)
138 force_sig(SIGTRAP, current);
142 * Special handler for BUG() traps.
144 BUILD_TRAP_HANDLER(bug)
149 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
151 if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
152 SIGTRAP) == NOTIFY_STOP)
155 #ifdef CONFIG_GENERIC_BUG
156 if (__kernel_text_address(instruction_pointer(regs))) {
157 insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
158 if (insn == TRAPA_BUG_OPCODE)
164 force_sig(SIGTRAP, current);
167 BUILD_TRAP_HANDLER(nmi)
169 unsigned int cpu = smp_processor_id();
175 switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
180 die("Fatal Non-Maskable Interrupt", regs, SIGINT);
182 printk(KERN_ALERT "Got NMI, but nobody cared. Ignoring...\n");