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   1 #include <linux/bug.h>
   2 #include <linux/io.h>
   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 <asm/system.h>
   9
  10 #ifdef CONFIG_BUG
  11 void handle_BUG(struct pt_regs *regs)
  12 {
  13         enum bug_trap_type tt;
  14         tt = report_bug(regs->pc, regs);
  15         if (tt == BUG_TRAP_TYPE_WARN) {
  16                 regs->pc += instruction_size(regs->pc);
  17                 return;
  18         }
  19
  20         die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
  21 }
  22
  23 int is_valid_bugaddr(unsigned long addr)
  24 {
  25         insn_size_t opcode;
  26
  27         if (addr < PAGE_OFFSET)
  28                 return 0;
  29         if (probe_kernel_address((insn_size_t *)addr, opcode))
  30                 return 0;
  31
  32         if (opcode == TRAPA_BUG_OPCODE || opcode == TRAPA_UNWINDER_BUG_OPCODE)
  33                 return 1;
  34
  35         return 0;
  36 }
  37 #endif
  38
  39 /*
  40  * Generic trap handler.
  41  */
  42 BUILD_TRAP_HANDLER(debug)
  43 {
  44         TRAP_HANDLER_DECL;
  45
  46         /* Rewind */
  47         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  48
  49         if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
  50                        SIGTRAP) == NOTIFY_STOP)
  51                 return;
  52
  53         force_sig(SIGTRAP, current);
  54 }
  55
  56 /*
  57  * Special handler for BUG() traps.
  58  */
  59 BUILD_TRAP_HANDLER(bug)
  60 {
  61         TRAP_HANDLER_DECL;
  62
  63         /* Rewind */
  64         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  65
  66         if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
  67                        SIGTRAP) == NOTIFY_STOP)
  68                 return;
  69
  70 #ifdef CONFIG_BUG
  71         if (__kernel_text_address(instruction_pointer(regs))) {
  72                 insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
  73                 if (insn == TRAPA_BUG_OPCODE)
  74                         handle_BUG(regs);
  75                 return;
  76         }
  77 #endif
  78
  79         force_sig(SIGTRAP, current);
  80 }