include/asm-powerpc/bug.h

   1 #ifndef _ASM_POWERPC_BUG_H
   2 #define _ASM_POWERPC_BUG_H
   3 #ifdef __KERNEL__
   4
   5 #include <asm/asm-compat.h>
   6 /*
   7  * Define an illegal instr to trap on the bug.
   8  * We don't use 0 because that marks the end of a function
   9  * in the ELF ABI.  That's "Boo Boo" in case you wonder...
  10  */
  11 #define BUG_OPCODE .long 0x00b00b00  /* For asm */
  12 #define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
  13
  14 #ifndef __ASSEMBLY__
  15
  16 #ifdef CONFIG_BUG
  17
  18 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  19    sizeof(struct bug_entry), respectively */
  20 #ifdef CONFIG_DEBUG_BUGVERBOSE
  21 #define _EMIT_BUG_ENTRY                         \
  22         ".section __bug_table,\"a\"\n"          \
  23         "2:\t" PPC_LONG "1b, %0\n"              \
  24         "\t.short %1, %2\n"                     \
  25         ".org 2b+%3\n"                          \
  26         ".previous\n"
  27 #else
  28 #define _EMIT_BUG_ENTRY                         \
  29         ".section __bug_table,\"a\"\n"          \
  30         "2:\t" PPC_LONG "1b\n"                  \
  31         "\t.short %2\n"                         \
  32         ".org 2b+%3\n"                          \
  33         ".previous\n"
  34 #endif
  35
  36 /*
  37  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  38  * optimisations. However depending on the complexity of the condition
  39  * some compiler versions may not produce optimal results.
  40  */
  41
  42 #define BUG() do {                                              \
  43         __asm__ __volatile__(                                   \
  44                 "1:     twi 31,0,0\n"                           \
  45                 _EMIT_BUG_ENTRY                                 \
  46                 : : "i" (__FILE__), "i" (__LINE__),             \
  47                     "i" (0), "i"  (sizeof(struct bug_entry)));  \
  48         for(;;) ;                                               \
  49 } while (0)
  50
  51 #define BUG_ON(x) do {                                          \
  52         if (__builtin_constant_p(x)) {                          \
  53                 if (x)                                          \
  54                         BUG();                                  \
  55         } else {                                                \
  56                 __asm__ __volatile__(                           \
  57                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  58                 _EMIT_BUG_ENTRY                                 \
  59                 : : "i" (__FILE__), "i" (__LINE__), "i" (0),    \
  60                   "i" (sizeof(struct bug_entry)),               \
  61                   "r" ((long)(x)));                             \
  62         }                                                       \
  63 } while (0)
  64
  65 #define __WARN() do {                                           \
  66         __asm__ __volatile__(                                   \
  67                 "1:     twi 31,0,0\n"                           \
  68                 _EMIT_BUG_ENTRY                                 \
  69                 : : "i" (__FILE__), "i" (__LINE__),             \
  70                   "i" (BUGFLAG_WARNING),                        \
  71                   "i" (sizeof(struct bug_entry)));              \
  72 } while (0)
  73
  74 #define WARN_ON(x) ({                                           \
  75         typeof(x) __ret_warn_on = (x);                          \
  76         if (__builtin_constant_p(__ret_warn_on)) {              \
  77                 if (__ret_warn_on)                              \
  78                         __WARN();                               \
  79         } else {                                                \
  80                 __asm__ __volatile__(                           \
  81                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  82                 _EMIT_BUG_ENTRY                                 \
  83                 : : "i" (__FILE__), "i" (__LINE__),             \
  84                   "i" (BUGFLAG_WARNING),                        \
  85                   "i" (sizeof(struct bug_entry)),               \
  86                   "r" (__ret_warn_on));                         \
  87         }                                                       \
  88         unlikely(__ret_warn_on);                                \
  89 })
  90
  91 #define HAVE_ARCH_BUG
  92 #define HAVE_ARCH_BUG_ON
  93 #define HAVE_ARCH_WARN_ON
  94 #endif /* CONFIG_BUG */
  95 #endif /* __ASSEMBLY __ */
  96
  97 #include <asm-generic/bug.h>
  98
  99 #endif /* __KERNEL__ */
 100 #endif /* _ASM_POWERPC_BUG_H */