src/built_in.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * By Daniel Borkmann <daniel@netsniff-ng.org>
   4  * Copyright 2009-2012 Daniel Borkmann.
   5  * Subject to the GPL, version 2.
   6  */
   7
   8 #ifndef BUILT_IN_H
   9 #define BUILT_IN_H
  10
  11 #include <linux/if_packet.h>
  12 #include <assert.h>
  13 #include <endian.h>
  14 #include <byteswap.h>
  15 #include <stdint.h>
  16
  17 /* /sys/devices/system/cpu/cpuX/cache/indexX/coherency_line_size */
  18
  19 #if defined(__amd64__) || defined(__x86_64__) || defined(__AMD64__) || \
  20     defined(_M_X64) || defined(__amd64)
  21 # define CO_IN_CACHE_SHIFT              7
  22 #elif defined(__i386__) || defined(__x86__) || defined(__X86__) || \
  23       defined(_M_IX86) || defined(__i386)
  24 # define CO_IN_CACHE_SHIFT              7
  25 #elif defined(__ia64__) || defined(__IA64__) || defined(__M_IA64)
  26 # define CO_IN_CACHE_SHIFT              6
  27 #elif defined(__SPU__)
  28 # define CO_IN_CACHE_SHIFT              7
  29 #elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) || \
  30       defined(_ARCH_PPC64)
  31 # define CO_IN_CACHE_SHIFT              8
  32 #elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) || \
  33       defined(_ARCH_PPC)
  34 # define CO_IN_CACHE_SHIFT              7
  35 #elif defined(__sparcv9__) || defined(__sparcv9)
  36 # define CO_IN_CACHE_SHIFT              6
  37 #elif defined(__sparc_v8__)
  38 # define CO_IN_CACHE_SHIFT              5
  39 #elif defined(__sparc__) || defined(__sparc)
  40 # define CO_IN_CACHE_SHIFT              5
  41 #elif defined(__ARM_EABI__)
  42 # define CO_IN_CACHE_SHIFT              5
  43 #elif defined(__arm__)
  44 # define CO_IN_CACHE_SHIFT              5
  45 #elif defined(__mips__) || defined(__mips) || defined(__MIPS__)
  46 # if defined(_ABIO32)
  47 # define CO_IN_CACHE_SHIFT              5
  48 # elif defined(_ABIN32)
  49 # define CO_IN_CACHE_SHIFT              5
  50 # else
  51 # define CO_IN_CACHE_SHIFT              6
  52 # endif
  53 #else
  54 # define CO_IN_CACHE_SHIFT              5
  55 #endif
  56
  57 #ifndef CO_CACHE_LINE_SIZE
  58 # define CO_CACHE_LINE_SIZE     (1 << CO_IN_CACHE_SHIFT)
  59 #endif
  60
  61 #ifndef __aligned_16
  62 # define __aligned_16           __attribute__((aligned(16)))
  63 #endif
  64
  65 #ifndef __cacheline_aligned
  66 # define __cacheline_aligned    __attribute__((aligned(CO_CACHE_LINE_SIZE)))
  67 #endif
  68
  69 #ifndef __aligned_tpacket
  70 # define __aligned_tpacket      __attribute__((aligned(TPACKET_ALIGNMENT)))
  71 #endif
  72
  73 #ifndef __packed
  74 # define __packed               __attribute__((packed))
  75 #endif
  76
  77 #ifndef round_up
  78 # define round_up(x, alignment) (((x) + (alignment) - 1) & ~((alignment) - 1))
  79 #endif
  80
  81 #ifndef round_up_cacheline
  82 # define round_up_cacheline(x)  round_up((x), CO_CACHE_LINE_SIZE)
  83 #endif
  84
  85 #ifndef likely
  86 # define likely(x)              __builtin_expect(!!(x), 1)
  87 #endif
  88
  89 #ifndef unlikely
  90 # define unlikely(x)            __builtin_expect(!!(x), 0)
  91 #endif
  92
  93 #ifndef prefetch_rd_hi
  94 # define prefetch_rd_hi(addr)   __builtin_prefetch(addr, 0, 3)
  95 #endif
  96
  97 #ifndef prefetch_rd_lo
  98 # define prefetch_rd_lo(addr)   __builtin_prefetch(addr, 0, 0)
  99 #endif
 100
 101 #ifndef prefetch_wr_hi
 102 # define prefetch_wr_hi(addr)   __builtin_prefetch(addr, 1, 3)
 103 #endif
 104
 105 #ifndef prefetch_wr_lo
 106 # define prefetch_wr_lo(addr)   __builtin_prefetch(addr, 1, 0)
 107 #endif
 108
 109 #ifndef fmemset
 110 # define fmemset                __builtin_memset
 111 #endif
 112
 113 #ifndef fmemcpy
 114 # define fmemcpy                __builtin_memcpy
 115 #endif
 116
 117 #ifndef atomic_cmp_swp
 118 # define atomic_cmp_swp         __sync_val_compare_and_swap
 119 #endif
 120
 121 #ifndef __deprecated
 122 # define __deprecated           /* unimplemented */
 123 #endif
 124
 125 #ifndef __export
 126 # define __export               /* unimplemented */
 127 #endif
 128
 129 #ifndef __import
 130 # define __import               extern
 131 #endif
 132
 133 #ifndef unreachable
 134 # define unreachable()          do { } while (1)
 135 #endif
 136
 137 #ifndef __read_mostly
 138 # define __read_mostly          __attribute__((__section__(".data.read_mostly")))
 139 #endif
 140
 141 #ifndef __unused
 142 # define __unused                __attribute__ ((__unused__))
 143 #endif
 144
 145 #ifndef noinline
 146 # define noinline               __attribute__((noinline))
 147 #endif
 148
 149 #ifndef __always_inline
 150 # define __always_inline        inline
 151 #endif
 152
 153 #ifndef __hidden
 154 # define __hidden               __attribute__((visibility("hidden")))
 155 #endif
 156
 157 #ifndef __pure
 158 # define __pure                 __attribute__ ((pure))
 159 #endif
 160
 161 #ifndef force_cast
 162 # define force_cast(type, arg)  ((type) (arg))
 163 #endif
 164
 165 #ifndef access_once
 166 # define access_once(x)         (*(volatile typeof(x) *) &(x))
 167 #endif
 168
 169 #ifndef max
 170 # define max(a, b)                                                      \
 171         ({                                                              \
 172                 typeof (a) _a = (a);                                    \
 173                 typeof (b) _b = (b);                                    \
 174                 _a > _b ? _a : _b;                                      \
 175         })
 176 #endif /* max */
 177
 178 #ifndef min
 179 # define min(a, b)                                                      \
 180         ({                                                              \
 181                 typeof (a) _a = (a);                                    \
 182                 typeof (b) _b = (b);                                    \
 183                 _a < _b ? _a : _b;                                      \
 184         })
 185 #endif /* min */
 186
 187 #ifndef ispow2
 188 # define ispow2(x)              ({ !!((x) && !((x) & ((x) - 1))); })
 189 #endif
 190
 191 #ifndef offsetof
 192 # define offsetof(type, member) ((size_t) &((type *) 0)->member)
 193 #endif
 194
 195 #ifndef container_of
 196 # define container_of(ptr, type, member)                                \
 197         ({                                                              \
 198                 const typeof(((type *) 0)->member) * __mptr = (ptr);    \
 199                 (type *) ((char *) __mptr - offsetof(type, member));    \
 200         })
 201 #endif
 202
 203 #ifndef array_size
 204 # define array_size(x)  (sizeof(x) / sizeof((x)[0]) + __must_be_array(x))
 205 #endif
 206
 207 #ifndef __must_be_array
 208 # define __must_be_array(x)                                             \
 209         build_bug_on_zero(__builtin_types_compatible_p(typeof(x),       \
 210                                                        typeof(&x[0])))
 211 #endif
 212
 213 #ifndef build_bug_on_zero
 214 # define build_bug_on_zero(e)   (sizeof(char[1 - 2 * !!(e)]) - 1)
 215 #endif
 216
 217 #ifndef bug_on
 218 # define bug_on(cond)           assert(!(cond))
 219 #endif
 220
 221 #ifndef bug
 222 # define bug                    assert(0)
 223 #endif
 224
 225 #if __BYTE_ORDER == __LITTLE_ENDIAN
 226 static inline uint64_t htonll(uint64_t x)
 227 {
 228         return bswap_64(x);
 229 }
 230
 231 static inline uint64_t ntohll(uint64_t x)
 232 {
 233         return bswap_64(x);
 234 }
 235 #elif __BYTE_ORDER == __BIG_ENDIAN
 236 static inline uint64_t htonll(uint64_t x)
 237 {
 238         return x;
 239 }
 240
 241 static inline uint64_t ntohll(uint64_t x)
 242 {
 243         return x;
 244 }
 245 #else
 246 # error __BYTE_ORDER is neither __LITTLE_ENDIAN nor __BIG_ENDIAN
 247 #endif
 248
 249 #endif /* BUILT_IN_H */