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 <asm/system.h>
   8
   9 #ifdef CONFIG_BUG
  10 static void handle_BUG(struct pt_regs *regs)
  11 {
  12         enum bug_trap_type tt;
  13         tt = report_bug(regs->pc, regs);
  14         if (tt == BUG_TRAP_TYPE_WARN) {
  15                 regs->pc += instruction_size(regs->pc);
  16                 return;
  17         }
  18
  19         die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
  20 }
  21
  22 int is_valid_bugaddr(unsigned long addr)
  23 {
  24         return addr >= PAGE_OFFSET;
  25 }
  26 #endif
  27
  28 /*
  29  * Generic trap handler.
  30  */
  31 BUILD_TRAP_HANDLER(debug)
  32 {
  33         TRAP_HANDLER_DECL;
  34
  35         /* Rewind */
  36         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  37
  38         if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
  39                        SIGTRAP) == NOTIFY_STOP)
  40                 return;
  41
  42         force_sig(SIGTRAP, current);
  43 }
  44
  45 /*
  46  * Special handler for BUG() traps.
  47  */
  48 BUILD_TRAP_HANDLER(bug)
  49 {
  50         TRAP_HANDLER_DECL;
  51
  52         /* Rewind */
  53         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  54
  55         if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
  56                        SIGTRAP) == NOTIFY_STOP)
  57                 return;
  58
  59 #ifdef CONFIG_BUG
  60         if (__kernel_text_address(instruction_pointer(regs))) {
  61                 opcode_t insn = *(opcode_t *)instruction_pointer(regs);
  62                 if (insn == TRAPA_BUG_OPCODE)
  63                         handle_BUG(regs);
  64         }
  65 #endif
  66
  67         force_sig(SIGTRAP, current);
  68 }