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 struct bug_entry {
  17         unsigned long   bug_addr;
  18         long            line;
  19         const char      *file;
  20         const char      *function;
  21 };
  22
  23 struct bug_entry *find_bug(unsigned long bugaddr);
  24
  25 /*
  26  * If this bit is set in the line number it means that the trap
  27  * is for WARN_ON rather than BUG or BUG_ON.
  28  */
  29 #define BUG_WARNING_TRAP        0x1000000
  30
  31 #ifdef CONFIG_BUG
  32
  33 /*
  34  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  35  * optimisations. However depending on the complexity of the condition
  36  * some compiler versions may not produce optimal results.
  37  */
  38
  39 #define BUG() do {                                                       \
  40         __asm__ __volatile__(                                            \
  41                 "1:     twi 31,0,0\n"                                    \
  42                 ".section __bug_table,\"a\"\n"                           \
  43                 "\t"PPC_LONG"   1b,%0,%1,%2\n"                           \
  44                 ".previous"                                              \
  45                 : : "i" (__LINE__), "i" (__FILE__), "i" (__FUNCTION__)); \
  46 } while (0)
  47
  48 #define BUG_ON(x) do {                                          \
  49         if (__builtin_constant_p(x)) {                          \
  50                 if (x)                                          \
  51                         BUG();                                  \
  52         } else {                                                \
  53                 __asm__ __volatile__(                           \
  54                 "1:     "PPC_TLNEI"     %0,0\n"                 \
  55                 ".section __bug_table,\"a\"\n"                  \
  56                 "\t"PPC_LONG"   1b,%1,%2,%3\n"                  \
  57                 ".previous"                                     \
  58                 : : "r" ((long)(x)), "i" (__LINE__),            \
  59                     "i" (__FILE__), "i" (__FUNCTION__));        \
  60         }                                                       \
  61 } while (0)
  62
  63 #define __WARN() do {                                           \
  64         __asm__ __volatile__(                                   \
  65                 "1:     twi 31,0,0\n"                           \
  66                 ".section __bug_table,\"a\"\n"                  \
  67                 "\t"PPC_LONG"   1b,%0,%1,%2\n"                  \
  68                 ".previous"                                     \
  69                 : : "i" (__LINE__ + BUG_WARNING_TRAP),          \
  70                     "i" (__FILE__), "i" (__FUNCTION__));        \
  71 } while (0)
  72
  73 #define WARN_ON(x) ({                                           \
  74         typeof(x) __ret_warn_on = (x);                          \
  75         if (__builtin_constant_p(__ret_warn_on)) {              \
  76                 if (__ret_warn_on)                              \
  77                         __WARN();                               \
  78         } else {                                                \
  79                 __asm__ __volatile__(                           \
  80                 "1:     "PPC_TLNEI"     %0,0\n"                 \
  81                 ".section __bug_table,\"a\"\n"                  \
  82                 "\t"PPC_LONG"   1b,%1,%2,%3\n"                  \
  83                 ".previous"                                     \
  84                 : : "r" (__ret_warn_on),                        \
  85                     "i" (__LINE__ + BUG_WARNING_TRAP),          \
  86                     "i" (__FILE__), "i" (__FUNCTION__));        \
  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 */