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 <asm/unwinder.h>
10 #include <asm/system.h>
12 #ifdef CONFIG_GENERIC_BUG
13 static void handle_BUG(struct pt_regs *regs)
15 const struct bug_entry *bug;
16 unsigned long bugaddr = regs->pc;
17 enum bug_trap_type tt;
19 if (!is_valid_bugaddr(bugaddr))
22 bug = find_bug(bugaddr);
24 /* Switch unwinders when unwind_stack() is called */
25 if (bug->flags & BUGFLAG_UNWINDER)
28 tt = report_bug(bugaddr, regs);
29 if (tt == BUG_TRAP_TYPE_WARN) {
30 regs->pc += instruction_size(bugaddr);
35 die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
38 int is_valid_bugaddr(unsigned long addr)
42 if (addr < PAGE_OFFSET)
44 if (probe_kernel_address((insn_size_t *)addr, opcode))
46 if (opcode == TRAPA_BUG_OPCODE)
54 * Generic trap handler.
56 BUILD_TRAP_HANDLER(debug)
61 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
63 if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
64 SIGTRAP) == NOTIFY_STOP)
67 force_sig(SIGTRAP, current);
71 * Special handler for BUG() traps.
73 BUILD_TRAP_HANDLER(bug)
78 regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
80 if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
81 SIGTRAP) == NOTIFY_STOP)
84 #ifdef CONFIG_GENERIC_BUG
85 if (__kernel_text_address(instruction_pointer(regs))) {
86 insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
87 if (insn == TRAPA_BUG_OPCODE)
93 force_sig(SIGTRAP, current);
96 BUILD_TRAP_HANDLER(nmi)
98 unsigned int cpu = smp_processor_id();
104 switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
109 die("Fatal Non-Maskable Interrupt", regs, SIGINT);
111 printk(KERN_ALERT "Got NMI, but nobody cared. Ignoring...\n");