LXR linux/include/asm-powerpc/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#ifndef __ASSEMBLY__
  15
  16struct bug_entry {
  17        unsigned long   bug_addr;
  18        long            line;
  19        const char      *file;
  20        const char      *function;
  21};
  22
  23struct bug_entry *find_bug(unsigned long bugaddr);
  24
  25/*
  26 * If this bit is set in the line number it means that the trap
  27 * is for WARN_ON rather than BUG or BUG_ON.
  28 */
  29#define BUG_WARNING_TRAP        0x1000000
  30
  31#ifdef CONFIG_BUG
  32
  33/*
  34 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  35 * optimisations. However depending on the complexity of the condition
  36 * some compiler versions may not produce optimal results.
  37 */
  38
  39#define BUG() do {                                                       \
  40        __asm__ __volatile__(                                            \
  41                "1:     twi 31,0,0\n"                                    \
  42                ".section __bug_table,\"a\"\n"                           \
  43                "\t"PPC_LONG"   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        if (__builtin_constant_p(x)) {                          \
  50                if (x)                                          \
  51                        BUG();                                  \
  52        } else {                                                \
  53                __asm__ __volatile__(                           \
  54                "1:     "PPC_TLNEI"     %0,0\n"                 \
  55                ".section __bug_table,\"a\"\n"                  \
  56                "\t"PPC_LONG"   1b,%1,%2,%3\n"                  \
  57                ".previous"                                     \
  58                : : "r" ((long)(x)), "i" (__LINE__),            \
  59                    "i" (__FILE__), "i" (__FUNCTION__));        \
  60        }                                                       \
  61} while (0)
  62
  63#define __WARN() do {                                           \
  64        __asm__ __volatile__(                                   \
  65                "1:     twi 31,0,0\n"                           \
  66                ".section __bug_table,\"a\"\n"                  \
  67                "\t"PPC_LONG"   1b,%0,%1,%2\n"                  \
  68                ".previous"                                     \
  69                : : "i" (__LINE__ + BUG_WARNING_TRAP),          \
  70                    "i" (__FILE__), "i" (__FUNCTION__));        \
  71} while (0)
  72
  73#define WARN_ON(x) do {                                         \
  74        if (__builtin_constant_p(x)) {                          \
  75                if (x)                                          \
  76                        __WARN();                               \
  77        } else {                                                \
  78                __asm__ __volatile__(                           \
  79                "1:     "PPC_TLNEI"     %0,0\n"                 \
  80                ".section __bug_table,\"a\"\n"                  \
  81                "\t"PPC_LONG"   1b,%1,%2,%3\n"                  \
  82                ".previous"                                     \
  83                : : "r" ((long)(x)),                            \
  84                    "i" (__LINE__ + BUG_WARNING_TRAP),          \
  85                    "i" (__FILE__), "i" (__FUNCTION__));        \
  86        }                                                       \
  87} while (0)
  88
  89#define HAVE_ARCH_BUG
  90#define HAVE_ARCH_BUG_ON
  91#define HAVE_ARCH_WARN_ON
  92#endif /* CONFIG_BUG */
  93#endif /* __ASSEMBLY __ */
  94
  95#include <asm-generic/bug.h>
  96
  97#endif /* __KERNEL__ */
  98#endif /* _ASM_POWERPC_BUG_H */
  99