arch/powerpc/include/asm/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 #ifdef CONFIG_BUG
  15
  16 #ifdef __ASSEMBLY__
  17 #ifdef CONFIG_DEBUG_BUGVERBOSE
  18 .macro EMIT_BUG_ENTRY addr,file,line,flags
  19          .section __bug_table,"a"
  20 5001:    PPC_LONG \addr, 5002f
  21          .short \line, \flags
  22          .org 5001b+BUG_ENTRY_SIZE
  23          .previous
  24          .section .rodata,"a"
  25 5002:    .asciz "\file"
  26          .previous
  27 .endm
  28 #else
  29  .macro EMIT_BUG_ENTRY addr,file,line,flags
  30          .section __bug_table,"a"
  31 5001:    PPC_LONG \addr
  32          .short \flags
  33          .org 5001b+BUG_ENTRY_SIZE
  34          .previous
  35 .endm
  36 #endif /* verbose */
  37
  38 #else /* !__ASSEMBLY__ */
  39 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  40    sizeof(struct bug_entry), respectively */
  41 #ifdef CONFIG_DEBUG_BUGVERBOSE
  42 #define _EMIT_BUG_ENTRY                         \
  43         ".section __bug_table,\"a\"\n"          \
  44         "2:\t" PPC_LONG "1b, %0\n"              \
  45         "\t.short %1, %2\n"                     \
  46         ".org 2b+%3\n"                          \
  47         ".previous\n"
  48 #else
  49 #define _EMIT_BUG_ENTRY                         \
  50         ".section __bug_table,\"a\"\n"          \
  51         "2:\t" PPC_LONG "1b\n"                  \
  52         "\t.short %2\n"                         \
  53         ".org 2b+%3\n"                          \
  54         ".previous\n"
  55 #endif
  56
  57 /*
  58  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  59  * optimisations. However depending on the complexity of the condition
  60  * some compiler versions may not produce optimal results.
  61  */
  62
  63 #define BUG() do {                                              \
  64         __asm__ __volatile__(                                   \
  65                 "1:     twi 31,0,0\n"                           \
  66                 _EMIT_BUG_ENTRY                                 \
  67                 : : "i" (__FILE__), "i" (__LINE__),             \
  68                     "i" (0), "i"  (sizeof(struct bug_entry)));  \
  69         for(;;) ;                                               \
  70 } while (0)
  71
  72 #define BUG_ON(x) do {                                          \
  73         if (__builtin_constant_p(x)) {                          \
  74                 if (x)                                          \
  75                         BUG();                                  \
  76         } else {                                                \
  77                 __asm__ __volatile__(                           \
  78                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  79                 _EMIT_BUG_ENTRY                                 \
  80                 : : "i" (__FILE__), "i" (__LINE__), "i" (0),    \
  81                   "i" (sizeof(struct bug_entry)),               \
  82                   "r" ((__force long)(x)));                     \
  83         }                                                       \
  84 } while (0)
  85
  86 #define __WARN() do {                                           \
  87         __asm__ __volatile__(                                   \
  88                 "1:     twi 31,0,0\n"                           \
  89                 _EMIT_BUG_ENTRY                                 \
  90                 : : "i" (__FILE__), "i" (__LINE__),             \
  91                   "i" (BUGFLAG_WARNING),                        \
  92                   "i" (sizeof(struct bug_entry)));              \
  93 } while (0)
  94
  95 #define WARN_ON(x) ({                                           \
  96         int __ret_warn_on = !!(x);                              \
  97         if (__builtin_constant_p(__ret_warn_on)) {              \
  98                 if (__ret_warn_on)                              \
  99                         __WARN();                               \
 100         } else {                                                \
 101                 __asm__ __volatile__(                           \
 102                 "1:     "PPC_TLNEI"     %4,0\n"                 \
 103                 _EMIT_BUG_ENTRY                                 \
 104                 : : "i" (__FILE__), "i" (__LINE__),             \
 105                   "i" (BUGFLAG_WARNING),                        \
 106                   "i" (sizeof(struct bug_entry)),               \
 107                   "r" (__ret_warn_on));                         \
 108         }                                                       \
 109         unlikely(__ret_warn_on);                                \
 110 })
 111
 112 #define HAVE_ARCH_BUG
 113 #define HAVE_ARCH_BUG_ON
 114 #define HAVE_ARCH_WARN_ON
 115 #endif /* __ASSEMBLY __ */
 116 #endif /* CONFIG_BUG */
 117
 118 #include <asm-generic/bug.h>
 119
 120 #endif /* __KERNEL__ */
 121 #endif /* _ASM_POWERPC_BUG_H */