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 <asm/system.h>
   6
   7 #ifdef CONFIG_BUG
   8 static void handle_BUG(struct pt_regs *regs)
   9 {
  10         enum bug_trap_type tt;
  11         tt = report_bug(regs->pc, regs);
  12         if (tt == BUG_TRAP_TYPE_WARN) {
  13                 regs->pc += instruction_size(regs->pc);
  14                 return;
  15         }
  16
  17         die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
  18 }
  19
  20 int is_valid_bugaddr(unsigned long addr)
  21 {
  22         return addr >= PAGE_OFFSET;
  23 }
  24 #endif
  25
  26 /*
  27  * Generic trap handler.
  28  */
  29 BUILD_TRAP_HANDLER(debug)
  30 {
  31         TRAP_HANDLER_DECL;
  32
  33         /* Rewind */
  34         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  35
  36         if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
  37                        SIGTRAP) == NOTIFY_STOP)
  38                 return;
  39
  40         force_sig(SIGTRAP, current);
  41 }
  42
  43 /*
  44  * Special handler for BUG() traps.
  45  */
  46 BUILD_TRAP_HANDLER(bug)
  47 {
  48         TRAP_HANDLER_DECL;
  49
  50         /* Rewind */
  51         regs->pc -= instruction_size(ctrl_inw(regs->pc - 4));
  52
  53         if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
  54                        SIGTRAP) == NOTIFY_STOP)
  55                 return;
  56
  57 #ifdef CONFIG_BUG
  58         if (__kernel_text_address(instruction_pointer(regs))) {
  59                 opcode_t insn = *(opcode_t *)instruction_pointer(regs);
  60                 if (insn == TRAPA_BUG_OPCODE)
  61                         handle_BUG(regs);
  62         }
  63 #endif
  64
  65         force_sig(SIGTRAP, current);
  66 }