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(label, line, file, func) \
  16         ".llong " #label "\n .long " #line "\n .llong " #file ", " #func "\n"
  17 #define TRAP_OP(ra, rb) "1: tdnei " #ra ", " #rb "\n"
  18 #define DATA_TYPE long long
  19 #else
  20 #define BUG_TABLE_ENTRY(label, line, file, func) \
  21         ".long " #label ", " #line ", " #file ", " #func "\n"
  22 #define TRAP_OP(ra, rb) "1: twnei " #ra ", " #rb "\n"
  23 #define DATA_TYPE int
  24 #endif /* __powerpc64__ */
  25
  26 struct bug_entry {
  27         unsigned long   bug_addr;
  28         int             line;
  29         const char      *file;
  30         const char      *function;
  31 };
  32
  33 struct bug_entry *find_bug(unsigned long bugaddr);
  34
  35 /*
  36  * If this bit is set in the line number it means that the trap
  37  * is for WARN_ON rather than BUG or BUG_ON.
  38  */
  39 #define BUG_WARNING_TRAP        0x1000000
  40
  41 #ifdef CONFIG_BUG
  42
  43 #define BUG() do {                                                       \
  44         __asm__ __volatile__(                                            \
  45                 "1:     twi 31,0,0\n"                                    \
  46                 ".section __bug_table,\"a\"\n\t"                         \
  47                 BUG_TABLE_ENTRY(1b,%0,%1,%2)                             \
  48                 ".previous"                                              \
  49                 : : "i" (__LINE__), "i" (__FILE__), "i" (__FUNCTION__)); \
  50 } while (0)
  51
  52 #define BUG_ON(x) do {                                          \
  53         __asm__ __volatile__(                                   \
  54                 TRAP_OP(%0,0)                                   \
  55                 ".section __bug_table,\"a\"\n\t"                \
  56                 BUG_TABLE_ENTRY(1b,%1,%2,%3)                    \
  57                 ".previous"                                     \
  58                 : : "r" ((DATA_TYPE)(x)), "i" (__LINE__),       \
  59                     "i" (__FILE__), "i" (__FUNCTION__));        \
  60 } while (0)
  61
  62 #define WARN_ON(x) do {                                         \
  63         __asm__ __volatile__(                                   \
  64                 TRAP_OP(%0,0)                                   \
  65                 ".section __bug_table,\"a\"\n\t"                \
  66                 BUG_TABLE_ENTRY(1b,%1,%2,%3)                    \
  67                 ".previous"                                     \
  68                 : : "r" ((DATA_TYPE)(x)),                       \
  69                     "i" (__LINE__ + BUG_WARNING_TRAP),          \
  70                     "i" (__FILE__), "i" (__FUNCTION__));        \
  71 } while (0)
  72
  73 #define HAVE_ARCH_BUG
  74 #define HAVE_ARCH_BUG_ON
  75 #define HAVE_ARCH_WARN_ON
  76 #endif /* CONFIG_BUG */
  77 #endif /* __ASSEMBLY __ */
  78
  79 #include <asm-generic/bug.h>
  80
  81 #endif /* _ASM_POWERPC_BUG_H */