include/asm-powerpc/bug.h

   1 #ifndef _ASM_POWERPC_BUG_H
   2 #define _ASM_POWERPC_BUG_H
   3
   4 /*
   5  * Define an illegal instr to trap on the bug.
   6  * We don't use 0 because that marks the end of a function
   7  * in the ELF ABI.  That's "Boo Boo" in case you wonder...
   8  */
   9 #define BUG_OPCODE .long 0x00b00b00  /* For asm */
  10 #define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
  11
  12 #ifndef __ASSEMBLY__
  13
  14 #ifdef __powerpc64__
  15 #define BUG_TABLE_ENTRY         ".llong"
  16 #define BUG_TRAP_OP             "tdnei"
  17 #else
  18 #define BUG_TABLE_ENTRY         ".long"
  19 #define BUG_TRAP_OP             "twnei"
  20 #endif /* __powerpc64__ */
  21
  22 struct bug_entry {
  23         unsigned long   bug_addr;
  24         long            line;
  25         const char      *file;
  26         const char      *function;
  27 };
  28
  29 struct bug_entry *find_bug(unsigned long bugaddr);
  30
  31 /*
  32  * If this bit is set in the line number it means that the trap
  33  * is for WARN_ON rather than BUG or BUG_ON.
  34  */
  35 #define BUG_WARNING_TRAP        0x1000000
  36
  37 #ifdef CONFIG_BUG
  38
  39 #define BUG() do {                                                       \
  40         __asm__ __volatile__(                                            \
  41                 "1:     twi 31,0,0\n"                                    \
  42                 ".section __bug_table,\"a\"\n"                           \
  43                 "\t"BUG_TABLE_ENTRY"    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         __asm__ __volatile__(                                   \
  50                 "1:     "BUG_TRAP_OP"   %0,0\n"                 \
  51                 ".section __bug_table,\"a\"\n"                  \
  52                 "\t"BUG_TABLE_ENTRY"    1b,%1,%2,%3\n"          \
  53                 ".previous"                                     \
  54                 : : "r" ((long)(x)), "i" (__LINE__),            \
  55                     "i" (__FILE__), "i" (__FUNCTION__));        \
  56 } while (0)
  57
  58 #define WARN_ON(x) do {                                         \
  59         __asm__ __volatile__(                                   \
  60                 "1:     "BUG_TRAP_OP"   %0,0\n"                 \
  61                 ".section __bug_table,\"a\"\n"                  \
  62                 "\t"BUG_TABLE_ENTRY"    1b,%1,%2,%3\n"          \
  63                 ".previous"                                     \
  64                 : : "r" ((long)(x)),                            \
  65                     "i" (__LINE__ + BUG_WARNING_TRAP),          \
  66                     "i" (__FILE__), "i" (__FUNCTION__));        \
  67 } while (0)
  68
  69 #define HAVE_ARCH_BUG
  70 #define HAVE_ARCH_BUG_ON
  71 #define HAVE_ARCH_WARN_ON
  72 #endif /* CONFIG_BUG */
  73 #endif /* __ASSEMBLY __ */
  74
  75 #include <asm-generic/bug.h>
  76
  77 #endif /* _ASM_POWERPC_BUG_H */