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 /*
   8  * Define an illegal instr to trap on the bug.
   9  * We don't use 0 because that marks the end of a function
  10  * in the ELF ABI.  That's "Boo Boo" in case you wonder...
  11  */
  12 #define BUG_OPCODE .long 0x00b00b00  /* For asm */
  13 #define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
  14
  15 #ifdef CONFIG_BUG
  16
  17 #ifdef __ASSEMBLY__
  18 #include <asm/asm-offsets.h>
  19 #ifdef CONFIG_DEBUG_BUGVERBOSE
  20 .macro EMIT_BUG_ENTRY addr,file,line,flags
  21          .section __bug_table,"a"
  22 5001:    PPC_LONG \addr, 5002f
  23          .short \line, \flags
  24          .org 5001b+BUG_ENTRY_SIZE
  25          .previous
  26          .section .rodata,"a"
  27 5002:    .asciz "\file"
  28          .previous
  29 .endm
  30 #else
  31 .macro EMIT_BUG_ENTRY addr,file,line,flags
  32          .section __bug_table,"a"
  33 5001:    PPC_LONG \addr
  34          .short \flags
  35          .org 5001b+BUG_ENTRY_SIZE
  36          .previous
  37 .endm
  38 #endif /* verbose */
  39
  40 #else /* !__ASSEMBLY__ */
  41 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  42    sizeof(struct bug_entry), respectively */
  43 #ifdef CONFIG_DEBUG_BUGVERBOSE
  44 #define _EMIT_BUG_ENTRY                         \
  45         ".section __bug_table,\"a\"\n"          \
  46         "2:\t" PPC_LONG "1b, %0\n"              \
  47         "\t.short %1, %2\n"                     \
  48         ".org 2b+%3\n"                          \
  49         ".previous\n"
  50 #else
  51 #define _EMIT_BUG_ENTRY                         \
  52         ".section __bug_table,\"a\"\n"          \
  53         "2:\t" PPC_LONG "1b\n"                  \
  54         "\t.short %2\n"                         \
  55         ".org 2b+%3\n"                          \
  56         ".previous\n"
  57 #endif
  58
  59 /*
  60  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  61  * optimisations. However depending on the complexity of the condition
  62  * some compiler versions may not produce optimal results.
  63  */
  64
  65 #define BUG() do {                                              \
  66         __asm__ __volatile__(                                   \
  67                 "1:     twi 31,0,0\n"                           \
  68                 _EMIT_BUG_ENTRY                                 \
  69                 : : "i" (__FILE__), "i" (__LINE__),             \
  70                     "i" (0), "i"  (sizeof(struct bug_entry)));  \
  71         unreachable();                                          \
  72 } while (0)
  73
  74 #define BUG_ON(x) do {                                          \
  75         if (__builtin_constant_p(x)) {                          \
  76                 if (x)                                          \
  77                         BUG();                                  \
  78         } else {                                                \
  79                 __asm__ __volatile__(                           \
  80                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  81                 _EMIT_BUG_ENTRY                                 \
  82                 : : "i" (__FILE__), "i" (__LINE__), "i" (0),    \
  83                   "i" (sizeof(struct bug_entry)),               \
  84                   "r" ((__force long)(x)));                     \
  85         }                                                       \
  86 } while (0)
  87
  88 #define __WARN() do {                                           \
  89         __asm__ __volatile__(                                   \
  90                 "1:     twi 31,0,0\n"                           \
  91                 _EMIT_BUG_ENTRY                                 \
  92                 : : "i" (__FILE__), "i" (__LINE__),             \
  93                   "i" (BUGFLAG_WARNING),                        \
  94                   "i" (sizeof(struct bug_entry)));              \
  95 } while (0)
  96
  97 #define WARN_ON(x) ({                                           \
  98         int __ret_warn_on = !!(x);                              \
  99         if (__builtin_constant_p(__ret_warn_on)) {              \
 100                 if (__ret_warn_on)                              \
 101                         __WARN();                               \
 102         } else {                                                \
 103                 __asm__ __volatile__(                           \
 104                 "1:     "PPC_TLNEI"     %4,0\n"                 \
 105                 _EMIT_BUG_ENTRY                                 \
 106                 : : "i" (__FILE__), "i" (__LINE__),             \
 107                   "i" (BUGFLAG_WARNING),                        \
 108                   "i" (sizeof(struct bug_entry)),               \
 109                   "r" (__ret_warn_on));                         \
 110         }                                                       \
 111         unlikely(__ret_warn_on);                                \
 112 })
 113
 114 #define HAVE_ARCH_BUG
 115 #define HAVE_ARCH_BUG_ON
 116 #define HAVE_ARCH_WARN_ON
 117 #endif /* __ASSEMBLY __ */
 118 #else
 119 #ifdef __ASSEMBLY__
 120 .macro EMIT_BUG_ENTRY addr,file,line,flags
 121 .endm
 122 #else /* !__ASSEMBLY__ */
 123 #define _EMIT_BUG_ENTRY
 124 #endif
 125 #endif /* CONFIG_BUG */
 126
 127 #include <asm-generic/bug.h>
 128
 129 #endif /* __KERNEL__ */
 130 #endif /* _ASM_POWERPC_BUG_H */