include/qemu/bswap.h

   1 #ifndef BSWAP_H
   2 #define BSWAP_H
   3
   4 #include "config-host.h"
   5 #include <inttypes.h>
   6 #include <limits.h>
   7 #include <string.h>
   8 #include "fpu/softfloat.h"
   9
  10 #ifdef CONFIG_MACHINE_BSWAP_H
  11 # include <sys/endian.h>
  12 # include <sys/types.h>
  13 # include <machine/bswap.h>
  14 #elif defined(__FreeBSD__)
  15 # include <sys/endian.h>
  16 #elif defined(CONFIG_BYTESWAP_H)
  17 # include <byteswap.h>
  18
  19 static inline uint16_t bswap16(uint16_t x)
  20 {
  21     return bswap_16(x);
  22 }
  23
  24 static inline uint32_t bswap32(uint32_t x)
  25 {
  26     return bswap_32(x);
  27 }
  28
  29 static inline uint64_t bswap64(uint64_t x)
  30 {
  31     return bswap_64(x);
  32 }
  33 # else
  34 static inline uint16_t bswap16(uint16_t x)
  35 {
  36     return (((x & 0x00ff) << 8) |
  37             ((x & 0xff00) >> 8));
  38 }
  39
  40 static inline uint32_t bswap32(uint32_t x)
  41 {
  42     return (((x & 0x000000ffU) << 24) |
  43             ((x & 0x0000ff00U) <<  8) |
  44             ((x & 0x00ff0000U) >>  8) |
  45             ((x & 0xff000000U) >> 24));
  46 }
  47
  48 static inline uint64_t bswap64(uint64_t x)
  49 {
  50     return (((x & 0x00000000000000ffULL) << 56) |
  51             ((x & 0x000000000000ff00ULL) << 40) |
  52             ((x & 0x0000000000ff0000ULL) << 24) |
  53             ((x & 0x00000000ff000000ULL) <<  8) |
  54             ((x & 0x000000ff00000000ULL) >>  8) |
  55             ((x & 0x0000ff0000000000ULL) >> 24) |
  56             ((x & 0x00ff000000000000ULL) >> 40) |
  57             ((x & 0xff00000000000000ULL) >> 56));
  58 }
  59 #endif /* ! CONFIG_MACHINE_BSWAP_H */
  60
  61 static inline void bswap16s(uint16_t *s)
  62 {
  63     *s = bswap16(*s);
  64 }
  65
  66 static inline void bswap32s(uint32_t *s)
  67 {
  68     *s = bswap32(*s);
  69 }
  70
  71 static inline void bswap64s(uint64_t *s)
  72 {
  73     *s = bswap64(*s);
  74 }
  75
  76 #if defined(HOST_WORDS_BIGENDIAN)
  77 #define be_bswap(v, size) (v)
  78 #define le_bswap(v, size) glue(bswap, size)(v)
  79 #define be_bswaps(v, size)
  80 #define le_bswaps(p, size) do { *p = glue(bswap, size)(*p); } while(0)
  81 #else
  82 #define le_bswap(v, size) (v)
  83 #define be_bswap(v, size) glue(bswap, size)(v)
  84 #define le_bswaps(v, size)
  85 #define be_bswaps(p, size) do { *p = glue(bswap, size)(*p); } while(0)
  86 #endif
  87
  88 #define CPU_CONVERT(endian, size, type)\
  89 static inline type endian ## size ## _to_cpu(type v)\
  90 {\
  91     return glue(endian, _bswap)(v, size);\
  92 }\
  93 \
  94 static inline type cpu_to_ ## endian ## size(type v)\
  95 {\
  96     return glue(endian, _bswap)(v, size);\
  97 }\
  98 \
  99 static inline void endian ## size ## _to_cpus(type *p)\
 100 {\
 101     glue(endian, _bswaps)(p, size);\
 102 }\
 103 \
 104 static inline void cpu_to_ ## endian ## size ## s(type *p)\
 105 {\
 106     glue(endian, _bswaps)(p, size);\
 107 }\
 108 \
 109 static inline type endian ## size ## _to_cpup(const type *p)\
 110 {\
 111     return glue(glue(endian, size), _to_cpu)(*p);\
 112 }\
 113 \
 114 static inline void cpu_to_ ## endian ## size ## w(type *p, type v)\
 115 {\
 116     *p = glue(glue(cpu_to_, endian), size)(v);\
 117 }
 118
 119 CPU_CONVERT(be, 16, uint16_t)
 120 CPU_CONVERT(be, 32, uint32_t)
 121 CPU_CONVERT(be, 64, uint64_t)
 122
 123 CPU_CONVERT(le, 16, uint16_t)
 124 CPU_CONVERT(le, 32, uint32_t)
 125 CPU_CONVERT(le, 64, uint64_t)
 126
 127 /* len must be one of 1, 2, 4 */
 128 static inline uint32_t qemu_bswap_len(uint32_t value, int len)
 129 {
 130     return bswap32(value) >> (32 - 8 * len);
 131 }
 132
 133 /* Unions for reinterpreting between floats and integers.  */
 134
 135 typedef union {
 136     float32 f;
 137     uint32_t l;
 138 } CPU_FloatU;
 139
 140 typedef union {
 141     float64 d;
 142 #if defined(HOST_WORDS_BIGENDIAN)
 143     struct {
 144         uint32_t upper;
 145         uint32_t lower;
 146     } l;
 147 #else
 148     struct {
 149         uint32_t lower;
 150         uint32_t upper;
 151     } l;
 152 #endif
 153     uint64_t ll;
 154 } CPU_DoubleU;
 155
 156 typedef union {
 157      floatx80 d;
 158      struct {
 159          uint64_t lower;
 160          uint16_t upper;
 161      } l;
 162 } CPU_LDoubleU;
 163
 164 typedef union {
 165     float128 q;
 166 #if defined(HOST_WORDS_BIGENDIAN)
 167     struct {
 168         uint32_t upmost;
 169         uint32_t upper;
 170         uint32_t lower;
 171         uint32_t lowest;
 172     } l;
 173     struct {
 174         uint64_t upper;
 175         uint64_t lower;
 176     } ll;
 177 #else
 178     struct {
 179         uint32_t lowest;
 180         uint32_t lower;
 181         uint32_t upper;
 182         uint32_t upmost;
 183     } l;
 184     struct {
 185         uint64_t lower;
 186         uint64_t upper;
 187     } ll;
 188 #endif
 189 } CPU_QuadU;
 190
 191 /* unaligned/endian-independent pointer access */
 192
 193 /*
 194  * the generic syntax is:
 195  *
 196  * load: ld{type}{sign}{size}{endian}_p(ptr)
 197  *
 198  * store: st{type}{size}{endian}_p(ptr, val)
 199  *
 200  * Note there are small differences with the softmmu access API!
 201  *
 202  * type is:
 203  * (empty): integer access
 204  *   f    : float access
 205  *
 206  * sign is:
 207  * (empty): for 32 or 64 bit sizes (including floats and doubles)
 208  *   u    : unsigned
 209  *   s    : signed
 210  *
 211  * size is:
 212  *   b: 8 bits
 213  *   w: 16 bits
 214  *   l: 32 bits
 215  *   q: 64 bits
 216  *
 217  * endian is:
 218  *   he   : host endian
 219  *   be   : big endian
 220  *   le   : little endian
 221  *   te   : target endian
 222  * (except for byte accesses, which have no endian infix).
 223  *
 224  * The target endian accessors are obviously only available to source
 225  * files which are built per-target; they are defined in cpu-all.h.
 226  *
 227  * In all cases these functions take a host pointer.
 228  * For accessors that take a guest address rather than a
 229  * host address, see the cpu_{ld,st}_* accessors defined in
 230  * cpu_ldst.h.
 231  */
 232
 233 static inline int ldub_p(const void *ptr)
 234 {
 235     return *(uint8_t *)ptr;
 236 }
 237
 238 static inline int ldsb_p(const void *ptr)
 239 {
 240     return *(int8_t *)ptr;
 241 }
 242
 243 static inline void stb_p(void *ptr, uint8_t v)
 244 {
 245     *(uint8_t *)ptr = v;
 246 }
 247
 248 /* Any compiler worth its salt will turn these memcpy into native unaligned
 249    operations.  Thus we don't need to play games with packed attributes, or
 250    inline byte-by-byte stores.  */
 251
 252 static inline int lduw_he_p(const void *ptr)
 253 {
 254     uint16_t r;
 255     memcpy(&r, ptr, sizeof(r));
 256     return r;
 257 }
 258
 259 static inline int ldsw_he_p(const void *ptr)
 260 {
 261     int16_t r;
 262     memcpy(&r, ptr, sizeof(r));
 263     return r;
 264 }
 265
 266 static inline void stw_he_p(void *ptr, uint16_t v)
 267 {
 268     memcpy(ptr, &v, sizeof(v));
 269 }
 270
 271 static inline int ldl_he_p(const void *ptr)
 272 {
 273     int32_t r;
 274     memcpy(&r, ptr, sizeof(r));
 275     return r;
 276 }
 277
 278 static inline void stl_he_p(void *ptr, uint32_t v)
 279 {
 280     memcpy(ptr, &v, sizeof(v));
 281 }
 282
 283 static inline uint64_t ldq_he_p(const void *ptr)
 284 {
 285     uint64_t r;
 286     memcpy(&r, ptr, sizeof(r));
 287     return r;
 288 }
 289
 290 static inline void stq_he_p(void *ptr, uint64_t v)
 291 {
 292     memcpy(ptr, &v, sizeof(v));
 293 }
 294
 295 static inline int lduw_le_p(const void *ptr)
 296 {
 297     return (uint16_t)le_bswap(lduw_he_p(ptr), 16);
 298 }
 299
 300 static inline int ldsw_le_p(const void *ptr)
 301 {
 302     return (int16_t)le_bswap(lduw_he_p(ptr), 16);
 303 }
 304
 305 static inline int ldl_le_p(const void *ptr)
 306 {
 307     return le_bswap(ldl_he_p(ptr), 32);
 308 }
 309
 310 static inline uint64_t ldq_le_p(const void *ptr)
 311 {
 312     return le_bswap(ldq_he_p(ptr), 64);
 313 }
 314
 315 static inline void stw_le_p(void *ptr, uint16_t v)
 316 {
 317     stw_he_p(ptr, le_bswap(v, 16));
 318 }
 319
 320 static inline void stl_le_p(void *ptr, uint32_t v)
 321 {
 322     stl_he_p(ptr, le_bswap(v, 32));
 323 }
 324
 325 static inline void stq_le_p(void *ptr, uint64_t v)
 326 {
 327     stq_he_p(ptr, le_bswap(v, 64));
 328 }
 329
 330 /* float access */
 331
 332 static inline float32 ldfl_le_p(const void *ptr)
 333 {
 334     CPU_FloatU u;
 335     u.l = ldl_le_p(ptr);
 336     return u.f;
 337 }
 338
 339 static inline void stfl_le_p(void *ptr, float32 v)
 340 {
 341     CPU_FloatU u;
 342     u.f = v;
 343     stl_le_p(ptr, u.l);
 344 }
 345
 346 static inline float64 ldfq_le_p(const void *ptr)
 347 {
 348     CPU_DoubleU u;
 349     u.ll = ldq_le_p(ptr);
 350     return u.d;
 351 }
 352
 353 static inline void stfq_le_p(void *ptr, float64 v)
 354 {
 355     CPU_DoubleU u;
 356     u.d = v;
 357     stq_le_p(ptr, u.ll);
 358 }
 359
 360 static inline int lduw_be_p(const void *ptr)
 361 {
 362     return (uint16_t)be_bswap(lduw_he_p(ptr), 16);
 363 }
 364
 365 static inline int ldsw_be_p(const void *ptr)
 366 {
 367     return (int16_t)be_bswap(lduw_he_p(ptr), 16);
 368 }
 369
 370 static inline int ldl_be_p(const void *ptr)
 371 {
 372     return be_bswap(ldl_he_p(ptr), 32);
 373 }
 374
 375 static inline uint64_t ldq_be_p(const void *ptr)
 376 {
 377     return be_bswap(ldq_he_p(ptr), 64);
 378 }
 379
 380 static inline void stw_be_p(void *ptr, uint16_t v)
 381 {
 382     stw_he_p(ptr, be_bswap(v, 16));
 383 }
 384
 385 static inline void stl_be_p(void *ptr, uint32_t v)
 386 {
 387     stl_he_p(ptr, be_bswap(v, 32));
 388 }
 389
 390 static inline void stq_be_p(void *ptr, uint64_t v)
 391 {
 392     stq_he_p(ptr, be_bswap(v, 64));
 393 }
 394
 395 /* float access */
 396
 397 static inline float32 ldfl_be_p(const void *ptr)
 398 {
 399     CPU_FloatU u;
 400     u.l = ldl_be_p(ptr);
 401     return u.f;
 402 }
 403
 404 static inline void stfl_be_p(void *ptr, float32 v)
 405 {
 406     CPU_FloatU u;
 407     u.f = v;
 408     stl_be_p(ptr, u.l);
 409 }
 410
 411 static inline float64 ldfq_be_p(const void *ptr)
 412 {
 413     CPU_DoubleU u;
 414     u.ll = ldq_be_p(ptr);
 415     return u.d;
 416 }
 417
 418 static inline void stfq_be_p(void *ptr, float64 v)
 419 {
 420     CPU_DoubleU u;
 421     u.d = v;
 422     stq_be_p(ptr, u.ll);
 423 }
 424
 425 static inline unsigned long leul_to_cpu(unsigned long v)
 426 {
 427     /* In order to break an include loop between here and
 428        qemu-common.h, don't rely on HOST_LONG_BITS.  */
 429 #if ULONG_MAX == UINT32_MAX
 430     return le_bswap(v, 32);
 431 #elif ULONG_MAX == UINT64_MAX
 432     return le_bswap(v, 64);
 433 #else
 434 # error Unknown sizeof long
 435 #endif
 436 }
 437
 438 #undef le_bswap
 439 #undef be_bswap
 440 #undef le_bswaps
 441 #undef be_bswaps
 442
 443 #endif /* BSWAP_H */