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  * Parts taken from the Linux kernel, GPL, version 2.
   6  * Subject to the GPL, version 2.
   7  */
   8
   9 #ifndef BUILT_IN_H
  10 #define BUILT_IN_H
  11
  12 #include <linux/if_packet.h>
  13 #include <assert.h>
  14 #include <endian.h>
  15 #include <byteswap.h>
  16 #include <stdint.h>
  17
  18 typedef uint64_t        u64;
  19 typedef uint32_t        u32;
  20 typedef uint16_t        u16;
  21 typedef uint8_t         u8;
  22
  23 #ifndef CO_CACHE_LINE_SIZE
  24 # define CO_CACHE_LINE_SIZE     (1 << CO_IN_CACHE_SHIFT)
  25 #endif
  26
  27 #ifndef MAX_CPUS
  28 # define MAX_CPUS                       32
  29 #endif
  30
  31 #ifndef __aligned_16
  32 # define __aligned_16           __attribute__((aligned(16)))
  33 #endif
  34
  35 #ifndef __cacheline_aligned
  36 # define __cacheline_aligned    __attribute__((aligned(CO_CACHE_LINE_SIZE)))
  37 #endif
  38
  39 #ifndef __aligned_tpacket
  40 # define __aligned_tpacket      __attribute__((aligned(TPACKET_ALIGNMENT)))
  41 #endif
  42
  43 #ifndef __align_tpacket
  44 # define __align_tpacket(x)     __attribute__((aligned(TPACKET_ALIGN(x))))
  45 #endif
  46
  47 #ifndef __check_format_printf
  48 # define __check_format_printf(pos_fmtstr, pos_fmtargs)         \
  49                 __attribute__ ((format (printf, (pos_fmtstr), (pos_fmtargs))))
  50 #endif
  51
  52 #ifndef __packed
  53 # define __packed               __attribute__((packed))
  54 #endif
  55
  56 #ifndef round_up
  57 # define round_up(x, alignment) (((x) + (alignment) - 1) & ~((alignment) - 1))
  58 #endif
  59
  60 #ifndef round_up_cacheline
  61 # define round_up_cacheline(x)  round_up((x), CO_CACHE_LINE_SIZE)
  62 #endif
  63
  64 #ifndef likely
  65 # define likely(x)              __builtin_expect(!!(x), 1)
  66 #endif
  67
  68 #ifndef unlikely
  69 # define unlikely(x)            __builtin_expect(!!(x), 0)
  70 #endif
  71
  72 #ifndef constant
  73 # define constant(x)            __builtin_constant_p(x)
  74 #endif
  75
  76 #ifndef fmemset
  77 # define fmemset                __builtin_memset
  78 #endif
  79
  80 #ifndef fmemcpy
  81 # define fmemcpy                __builtin_memcpy
  82 #endif
  83
  84 #ifndef __maybe_unused
  85 # define __maybe_unused         __attribute__ ((__unused__))
  86 #endif
  87
  88 #ifndef noinline
  89 # define noinline               __attribute__((noinline))
  90 #endif
  91
  92 #ifndef __hidden
  93 # define __hidden               __attribute__((visibility("hidden")))
  94 #endif
  95
  96 #ifndef __pure
  97 # define __pure                 __attribute__ ((pure))
  98 #endif
  99
 100 #ifndef __force
 101 # define __force                /* unimplemented */
 102 #endif
 103
 104 #ifndef force_cast
 105 # define force_cast(type, arg)  ((type) (arg))
 106 #endif
 107
 108 #ifndef max
 109 # define max(a, b)                                                      \
 110         ({                                                              \
 111                 typeof (a) _a = (a);                                    \
 112                 typeof (b) _b = (b);                                    \
 113                 _a > _b ? _a : _b;                                      \
 114         })
 115 #endif /* max */
 116
 117 #ifndef min
 118 # define min(a, b)                                                      \
 119         ({                                                              \
 120                 typeof (a) _a = (a);                                    \
 121                 typeof (b) _b = (b);                                    \
 122                 _a < _b ? _a : _b;                                      \
 123         })
 124 #endif /* min */
 125
 126 #ifndef ispow2
 127 # define ispow2(x)              ({ !!((x) && !((x) & ((x) - 1))); })
 128 #endif
 129
 130 #ifndef offsetof
 131 # define offsetof(type, member) ((size_t) &((type *) 0)->member)
 132 #endif
 133
 134 #ifndef container_of
 135 # define container_of(ptr, type, member)                                \
 136         ({                                                              \
 137                 const typeof(((type *) 0)->member) * __mptr = (ptr);    \
 138                 (type *) ((char *) __mptr - offsetof(type, member));    \
 139         })
 140 #endif
 141
 142 #ifndef array_size
 143 # define array_size(x)  (sizeof(x) / sizeof((x)[0]) + __must_be_array(x))
 144 #endif
 145
 146 #ifndef __must_be_array
 147 # define __must_be_array(x)                                             \
 148         build_bug_on_zero(__builtin_types_compatible_p(typeof(x),       \
 149                                                        typeof(&x[0])))
 150 #endif
 151
 152 #ifndef build_bug_on_zero
 153 # define build_bug_on_zero(e)   (sizeof(char[1 - 2 * !!(e)]) - 1)
 154 #endif
 155
 156 #ifndef bug_on
 157 # define bug_on(cond)           assert(!(cond))
 158 #endif
 159
 160 #ifndef bug
 161 # define bug()                  assert(0)
 162 #endif
 163
 164 #define PAGE_SIZE               (getpagesize())
 165 #define PAGE_MASK               (~(PAGE_SIZE - 1))
 166 #define PAGE_ALIGN(addr)        (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 167
 168 #if __BYTE_ORDER == __LITTLE_ENDIAN
 169 static inline uint64_t htonll(uint64_t x)
 170 {
 171         return bswap_64(x);
 172 }
 173
 174 static inline uint64_t ntohll(uint64_t x)
 175 {
 176         return bswap_64(x);
 177 }
 178 #elif __BYTE_ORDER == __BIG_ENDIAN
 179 static inline uint64_t htonll(uint64_t x)
 180 {
 181         return x;
 182 }
 183
 184 static inline uint64_t ntohll(uint64_t x)
 185 {
 186         return x;
 187 }
 188 #else
 189 # error __BYTE_ORDER is neither __LITTLE_ENDIAN nor __BIG_ENDIAN
 190 #endif
 191 #ifndef ___constant_swab16
 192 # define ___constant_swab16(x) ((__u16)(                        \
 193         (((__u16)(x) & (__u16)0x00ffU) << 8) |                  \
 194         (((__u16)(x) & (__u16)0xff00U) >> 8)))
 195 #endif
 196 #ifndef ___constant_swab32
 197 # define ___constant_swab32(x) ((__u32)(                        \
 198         (((__u32)(x) & (__u32)0x000000ffUL) << 24) |            \
 199         (((__u32)(x) & (__u32)0x0000ff00UL) <<  8) |            \
 200         (((__u32)(x) & (__u32)0x00ff0000UL) >>  8) |            \
 201         (((__u32)(x) & (__u32)0xff000000UL) >> 24)))
 202 #endif
 203 #if __BYTE_ORDER == __LITTLE_ENDIAN
 204 static inline u16 cpu_to_be16(u16 val)
 205 {
 206         return bswap_16(val);
 207 }
 208
 209 static inline u32 cpu_to_be32(u32 val)
 210 {
 211         return bswap_32(val);
 212 }
 213
 214 static inline u64 cpu_to_be64(u64 val)
 215 {
 216         return bswap_64(val);
 217 }
 218
 219 static inline u16 cpu_to_le16(u16 val)
 220 {
 221         return val;
 222 }
 223
 224 static inline u32 cpu_to_le32(u32 val)
 225 {
 226         return val;
 227 }
 228
 229 static inline u64 cpu_to_le64(u64 val)
 230 {
 231         return val;
 232 }
 233
 234 # ifndef __constant_htonl
 235 #  define __constant_htonl(x) ((__force __be32)___constant_swab32((x)))
 236 # endif
 237 # ifndef __constant_ntohl
 238 #  define __constant_ntohl(x) ___constant_swab32((__force __be32)(x))
 239 # endif
 240 # ifndef __constant_htons
 241 #  define __constant_htons(x) ((__force __be16)___constant_swab16((x)))
 242 # endif
 243 # ifndef __constant_ntohs
 244 #  define __constant_ntohs(x) ___constant_swab16((__force __be16)(x))
 245 # endif
 246 #elif __BYTE_ORDER == __BIG_ENDIAN
 247 static inline u16 cpu_to_be16(u16 val)
 248 {
 249         return val;
 250 }
 251
 252 static inline u32 cpu_to_be32(u32 val)
 253 {
 254         return val;
 255 }
 256
 257 static inline u64 cpu_to_be64(u64 val)
 258 {
 259         return val;
 260 }
 261
 262 static inline u16 cpu_to_le16(u16 val)
 263 {
 264         return bswap_16(val);
 265 }
 266
 267 static inline u32 cpu_to_le32(u32 val)
 268 {
 269         return bswap_32(val);
 270 }
 271
 272 static inline u64 cpu_to_le64(u64 val)
 273 {
 274         return bswap_64(val);
 275 }
 276
 277 # ifndef __constant_htonl
 278 #  define __constant_htonl(x) ((__force __be32)(__u32)(x))
 279 # endif
 280 # ifndef __constant_ntohl
 281 #  define __constant_ntohl(x) ((__force __u32)(__be32)(x))
 282 # endif
 283 # ifndef __constant_htons
 284 #  define __constant_htons(x) ((__force __be16)(__u16)(x))
 285 # endif
 286 # ifndef __constant_ntohs
 287 #  define __constant_ntohs(x) ((__force __u16)(__be16)(x))
 288 # endif
 289 #else
 290 # error __BYTE_ORDER is neither __LITTLE_ENDIAN nor __BIG_ENDIAN
 291 #endif
 292
 293 #define le64_to_cpu     cpu_to_le64
 294 #define le32_to_cpu     cpu_to_le32
 295 #define le16_to_cpu     cpu_to_le16
 296 #define be64_to_cpu     cpu_to_be64
 297 #define be32_to_cpu     cpu_to_be32
 298 #define be16_to_cpu     cpu_to_be16
 299
 300 #undef memset
 301 #undef memcpy
 302
 303 #define memset          fmemset
 304 #define memcpy          fmemcpy
 305
 306 #if defined(__amd64__) || defined(__x86_64__) || defined(__AMD64__) || \
 307     defined(_M_X64) || defined(__amd64)
 308 # define CO_IN_CACHE_SHIFT              7
 309 #elif defined(__i386__) || defined(__x86__) || defined(__X86__) || \
 310       defined(_M_IX86) || defined(__i386)
 311 # define CO_IN_CACHE_SHIFT              7
 312 #elif defined(__ia64__) || defined(__IA64__) || defined(__M_IA64)
 313 # define CO_IN_CACHE_SHIFT              6
 314 #elif defined(__SPU__)
 315 # define CO_IN_CACHE_SHIFT              7
 316 #elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) || \
 317       defined(_ARCH_PPC64)
 318 # define CO_IN_CACHE_SHIFT              8
 319 #elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) || \
 320       defined(_ARCH_PPC)
 321 # define CO_IN_CACHE_SHIFT              7
 322 #elif defined(__sparcv9__) || defined(__sparcv9)
 323 # define CO_IN_CACHE_SHIFT              6
 324 #elif defined(__sparc_v8__)
 325 # define CO_IN_CACHE_SHIFT              5
 326 #elif defined(__sparc__) || defined(__sparc)
 327 # define CO_IN_CACHE_SHIFT              5
 328 #elif defined(__ARM_EABI__)
 329 # define CO_IN_CACHE_SHIFT              5
 330 #elif defined(__arm__)
 331 # define CO_IN_CACHE_SHIFT              5
 332 #elif defined(__mips__) || defined(__mips) || defined(__MIPS__)
 333 # if defined(_ABIO32)
 334 # define CO_IN_CACHE_SHIFT              5
 335 # elif defined(_ABIN32)
 336 # define CO_IN_CACHE_SHIFT              5
 337 # else
 338 # define CO_IN_CACHE_SHIFT              6
 339 # endif
 340 #else
 341 # define CO_IN_CACHE_SHIFT              5
 342 #endif
 343
 344 #endif /* BUILT_IN_H */