arch/sh/kernel/traps.c

   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 static 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         return opcode == TRAPA_BUG_OPCODE;
  33 }
  34 #endif
  35
  36 /*
  37  * Generic trap handler.
  38  */
  39 BUILD_TRAP_HANDLER(debug)
  40 {
  41         TRAP_HANDLER_DECL;
  42
  43         /* Rewind */
  44         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  45
  46         if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
  47                        SIGTRAP) == NOTIFY_STOP)
  48                 return;
  49
  50         force_sig(SIGTRAP, current);
  51 }
  52
  53 /*
  54  * Special handler for BUG() traps.
  55  */
  56 BUILD_TRAP_HANDLER(bug)
  57 {
  58         TRAP_HANDLER_DECL;
  59
  60         /* Rewind */
  61         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  62
  63         if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
  64                        SIGTRAP) == NOTIFY_STOP)
  65                 return;
  66
  67 #ifdef CONFIG_BUG
  68         if (__kernel_text_address(instruction_pointer(regs))) {
  69                 insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
  70                 if (insn == TRAPA_BUG_OPCODE)
  71                         handle_BUG(regs);
  72                 return;
  73         }
  74 #endif
  75
  76         force_sig(SIGTRAP, current);
  77 }