arch/sh/include/asm/bug.h

   1 #ifndef __ASM_SH_BUG_H
   2 #define __ASM_SH_BUG_H
   3
   4 #include <linux/linkage.h>
   5
   6 #define TRAPA_BUG_OPCODE        0xc33e  /* trapa #0x3e */
   7 #define BUGFLAG_UNWINDER        (1 << 1)
   8
   9 #ifdef CONFIG_GENERIC_BUG
  10 #define HAVE_ARCH_BUG
  11 #define HAVE_ARCH_WARN_ON
  12
  13 /**
  14  * _EMIT_BUG_ENTRY
  15  * %1 - __FILE__
  16  * %2 - __LINE__
  17  * %3 - trap type
  18  * %4 - sizeof(struct bug_entry)
  19  *
  20  * The trapa opcode itself sits in %0.
  21  * The %O notation is used to avoid # generation.
  22  *
  23  * The offending file and line are encoded in the __bug_table section.
  24  */
  25 #ifdef CONFIG_DEBUG_BUGVERBOSE
  26 #define _EMIT_BUG_ENTRY                         \
  27         "\t.pushsection __bug_table,\"aw\"\n"   \
  28         "2:\t.long 1b, %O1\n"                   \
  29         "\t.short %O2, %O3\n"                   \
  30         "\t.org 2b+%O4\n"                       \
  31         "\t.popsection\n"
  32 #else
  33 #define _EMIT_BUG_ENTRY                         \
  34         "\t.pushsection __bug_table,\"aw\"\n"   \
  35         "2:\t.long 1b\n"                        \
  36         "\t.short %O3\n"                        \
  37         "\t.org 2b+%O4\n"                       \
  38         "\t.popsection\n"
  39 #endif
  40
  41 #define BUG()                                           \
  42 do {                                                    \
  43         __asm__ __volatile__ (                          \
  44                 "1:\t.short %O0\n"                      \
  45                 _EMIT_BUG_ENTRY                         \
  46                  :                                      \
  47                  : "n" (TRAPA_BUG_OPCODE),              \
  48                    "i" (__FILE__),                      \
  49                    "i" (__LINE__), "i" (0),             \
  50                    "i" (sizeof(struct bug_entry)));     \
  51         unreachable();                                  \
  52 } while (0)
  53
  54 #define __WARN_FLAGS(flags)                             \
  55 do {                                                    \
  56         __asm__ __volatile__ (                          \
  57                 "1:\t.short %O0\n"                      \
  58                  _EMIT_BUG_ENTRY                        \
  59                  :                                      \
  60                  : "n" (TRAPA_BUG_OPCODE),              \
  61                    "i" (__FILE__),                      \
  62                    "i" (__LINE__),                      \
  63                    "i" (BUGFLAG_WARNING|(flags)),       \
  64                    "i" (sizeof(struct bug_entry)));     \
  65 } while (0)
  66
  67 #define WARN_ON(x) ({                                           \
  68         int __ret_warn_on = !!(x);                              \
  69         if (__builtin_constant_p(__ret_warn_on)) {              \
  70                 if (__ret_warn_on)                              \
  71                         __WARN();                               \
  72         } else {                                                \
  73                 if (unlikely(__ret_warn_on))                    \
  74                         __WARN();                               \
  75         }                                                       \
  76         unlikely(__ret_warn_on);                                \
  77 })
  78
  79 #define UNWINDER_BUG()                                  \
  80 do {                                                    \
  81         __asm__ __volatile__ (                          \
  82                 "1:\t.short %O0\n"                      \
  83                 _EMIT_BUG_ENTRY                         \
  84                  :                                      \
  85                  : "n" (TRAPA_BUG_OPCODE),              \
  86                    "i" (__FILE__),                      \
  87                    "i" (__LINE__),                      \
  88                    "i" (BUGFLAG_UNWINDER),              \
  89                    "i" (sizeof(struct bug_entry)));     \
  90 } while (0)
  91
  92 #define UNWINDER_BUG_ON(x) ({                                   \
  93         int __ret_unwinder_on = !!(x);                          \
  94         if (__builtin_constant_p(__ret_unwinder_on)) {          \
  95                 if (__ret_unwinder_on)                          \
  96                         UNWINDER_BUG();                         \
  97         } else {                                                \
  98                 if (unlikely(__ret_unwinder_on))                \
  99                         UNWINDER_BUG();                         \
 100         }                                                       \
 101         unlikely(__ret_unwinder_on);                            \
 102 })
 103
 104 #else
 105
 106 #define UNWINDER_BUG    BUG
 107 #define UNWINDER_BUG_ON BUG_ON
 108
 109 #endif /* CONFIG_GENERIC_BUG */
 110
 111 #include <asm-generic/bug.h>
 112
 113 struct pt_regs;
 114
 115 /* arch/sh/kernel/traps.c */
 116 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
 117 extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
 118 extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);
 119
 120 #endif /* __ASM_SH_BUG_H */