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C/C++ Source or Header  |  2008-12-24  |  3.0 KB  |  122 lines
  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 */
  122.