include/qemu/bswap.h

   1 #ifndef BSWAP_H
   2 #define BSWAP_H
   3
   4 #include "fpu/softfloat.h"
   5
   6 #ifdef CONFIG_MACHINE_BSWAP_H
   7 # include <sys/endian.h>
   8 # include <machine/bswap.h>
   9 #elif defined(__FreeBSD__)
  10 # include <sys/endian.h>
  11 #elif defined(CONFIG_BYTESWAP_H)
  12 # include <byteswap.h>
  13
  14 static inline uint16_t bswap16(uint16_t x)
  15 {
  16     return bswap_16(x);
  17 }
  18
  19 static inline uint32_t bswap32(uint32_t x)
  20 {
  21     return bswap_32(x);
  22 }
  23
  24 static inline uint64_t bswap64(uint64_t x)
  25 {
  26     return bswap_64(x);
  27 }
  28 # else
  29 static inline uint16_t bswap16(uint16_t x)
  30 {
  31     return (((x & 0x00ff) << 8) |
  32             ((x & 0xff00) >> 8));
  33 }
  34
  35 static inline uint32_t bswap32(uint32_t x)
  36 {
  37     return (((x & 0x000000ffU) << 24) |
  38             ((x & 0x0000ff00U) <<  8) |
  39             ((x & 0x00ff0000U) >>  8) |
  40             ((x & 0xff000000U) >> 24));
  41 }
  42
  43 static inline uint64_t bswap64(uint64_t x)
  44 {
  45     return (((x & 0x00000000000000ffULL) << 56) |
  46             ((x & 0x000000000000ff00ULL) << 40) |
  47             ((x & 0x0000000000ff0000ULL) << 24) |
  48             ((x & 0x00000000ff000000ULL) <<  8) |
  49             ((x & 0x000000ff00000000ULL) >>  8) |
  50             ((x & 0x0000ff0000000000ULL) >> 24) |
  51             ((x & 0x00ff000000000000ULL) >> 40) |
  52             ((x & 0xff00000000000000ULL) >> 56));
  53 }
  54 #endif /* ! CONFIG_MACHINE_BSWAP_H */
  55
  56 static inline void bswap16s(uint16_t *s)
  57 {
  58     *s = bswap16(*s);
  59 }
  60
  61 static inline void bswap32s(uint32_t *s)
  62 {
  63     *s = bswap32(*s);
  64 }
  65
  66 static inline void bswap64s(uint64_t *s)
  67 {
  68     *s = bswap64(*s);
  69 }
  70
  71 #if defined(HOST_WORDS_BIGENDIAN)
  72 #define be_bswap(v, size) (v)
  73 #define le_bswap(v, size) glue(bswap, size)(v)
  74 #define be_bswaps(v, size)
  75 #define le_bswaps(p, size) do { *p = glue(bswap, size)(*p); } while(0)
  76 #else
  77 #define le_bswap(v, size) (v)
  78 #define be_bswap(v, size) glue(bswap, size)(v)
  79 #define le_bswaps(v, size)
  80 #define be_bswaps(p, size) do { *p = glue(bswap, size)(*p); } while(0)
  81 #endif
  82
  83 #define CPU_CONVERT(endian, size, type)\
  84 static inline type endian ## size ## _to_cpu(type v)\
  85 {\
  86     return glue(endian, _bswap)(v, size);\
  87 }\
  88 \
  89 static inline type cpu_to_ ## endian ## size(type v)\
  90 {\
  91     return glue(endian, _bswap)(v, size);\
  92 }\
  93 \
  94 static inline void endian ## size ## _to_cpus(type *p)\
  95 {\
  96     glue(endian, _bswaps)(p, size);\
  97 }\
  98 \
  99 static inline void cpu_to_ ## endian ## size ## s(type *p)\
 100 {\
 101     glue(endian, _bswaps)(p, size);\
 102 }\
 103 \
 104 static inline type endian ## size ## _to_cpup(const type *p)\
 105 {\
 106     return glue(glue(endian, size), _to_cpu)(*p);\
 107 }\
 108 \
 109 static inline void cpu_to_ ## endian ## size ## w(type *p, type v)\
 110 {\
 111     *p = glue(glue(cpu_to_, endian), size)(v);\
 112 }
 113
 114 CPU_CONVERT(be, 16, uint16_t)
 115 CPU_CONVERT(be, 32, uint32_t)
 116 CPU_CONVERT(be, 64, uint64_t)
 117
 118 CPU_CONVERT(le, 16, uint16_t)
 119 CPU_CONVERT(le, 32, uint32_t)
 120 CPU_CONVERT(le, 64, uint64_t)
 121
 122 /* len must be one of 1, 2, 4 */
 123 static inline uint32_t qemu_bswap_len(uint32_t value, int len)
 124 {
 125     return bswap32(value) >> (32 - 8 * len);
 126 }
 127
 128 /*
 129  * Same as cpu_to_le{16,23}, except that gcc will figure the result is
 130  * a compile-time constant if you pass in a constant.  So this can be
 131  * used to initialize static variables.
 132  */
 133 #if defined(HOST_WORDS_BIGENDIAN)
 134 # define const_le32(_x)                          \
 135     ((((_x) & 0x000000ffU) << 24) |              \
 136      (((_x) & 0x0000ff00U) <<  8) |              \
 137      (((_x) & 0x00ff0000U) >>  8) |              \
 138      (((_x) & 0xff000000U) >> 24))
 139 # define const_le16(_x)                          \
 140     ((((_x) & 0x00ff) << 8) |                    \
 141      (((_x) & 0xff00) >> 8))
 142 #else
 143 # define const_le32(_x) (_x)
 144 # define const_le16(_x) (_x)
 145 #endif
 146
 147 /* Unions for reinterpreting between floats and integers.  */
 148
 149 typedef union {
 150     float32 f;
 151     uint32_t l;
 152 } CPU_FloatU;
 153
 154 typedef union {
 155     float64 d;
 156 #if defined(HOST_WORDS_BIGENDIAN)
 157     struct {
 158         uint32_t upper;
 159         uint32_t lower;
 160     } l;
 161 #else
 162     struct {
 163         uint32_t lower;
 164         uint32_t upper;
 165     } l;
 166 #endif
 167     uint64_t ll;
 168 } CPU_DoubleU;
 169
 170 typedef union {
 171      floatx80 d;
 172      struct {
 173          uint64_t lower;
 174          uint16_t upper;
 175      } l;
 176 } CPU_LDoubleU;
 177
 178 typedef union {
 179     float128 q;
 180 #if defined(HOST_WORDS_BIGENDIAN)
 181     struct {
 182         uint32_t upmost;
 183         uint32_t upper;
 184         uint32_t lower;
 185         uint32_t lowest;
 186     } l;
 187     struct {
 188         uint64_t upper;
 189         uint64_t lower;
 190     } ll;
 191 #else
 192     struct {
 193         uint32_t lowest;
 194         uint32_t lower;
 195         uint32_t upper;
 196         uint32_t upmost;
 197     } l;
 198     struct {
 199         uint64_t lower;
 200         uint64_t upper;
 201     } ll;
 202 #endif
 203 } CPU_QuadU;
 204
 205 /* unaligned/endian-independent pointer access */
 206
 207 /*
 208  * the generic syntax is:
 209  *
 210  * load: ld{type}{sign}{size}{endian}_p(ptr)
 211  *
 212  * store: st{type}{size}{endian}_p(ptr, val)
 213  *
 214  * Note there are small differences with the softmmu access API!
 215  *
 216  * type is:
 217  * (empty): integer access
 218  *   f    : float access
 219  *
 220  * sign is:
 221  * (empty): for 32 or 64 bit sizes (including floats and doubles)
 222  *   u    : unsigned
 223  *   s    : signed
 224  *
 225  * size is:
 226  *   b: 8 bits
 227  *   w: 16 bits
 228  *   l: 32 bits
 229  *   q: 64 bits
 230  *
 231  * endian is:
 232  *   he   : host endian
 233  *   be   : big endian
 234  *   le   : little endian
 235  *   te   : target endian
 236  * (except for byte accesses, which have no endian infix).
 237  *
 238  * The target endian accessors are obviously only available to source
 239  * files which are built per-target; they are defined in cpu-all.h.
 240  *
 241  * In all cases these functions take a host pointer.
 242  * For accessors that take a guest address rather than a
 243  * host address, see the cpu_{ld,st}_* accessors defined in
 244  * cpu_ldst.h.
 245  */
 246
 247 static inline int ldub_p(const void *ptr)
 248 {
 249     return *(uint8_t *)ptr;
 250 }
 251
 252 static inline int ldsb_p(const void *ptr)
 253 {
 254     return *(int8_t *)ptr;
 255 }
 256
 257 static inline void stb_p(void *ptr, uint8_t v)
 258 {
 259     *(uint8_t *)ptr = v;
 260 }
 261
 262 /* Any compiler worth its salt will turn these memcpy into native unaligned
 263    operations.  Thus we don't need to play games with packed attributes, or
 264    inline byte-by-byte stores.  */
 265
 266 static inline int lduw_he_p(const void *ptr)
 267 {
 268     uint16_t r;
 269     memcpy(&r, ptr, sizeof(r));
 270     return r;
 271 }
 272
 273 static inline int ldsw_he_p(const void *ptr)
 274 {
 275     int16_t r;
 276     memcpy(&r, ptr, sizeof(r));
 277     return r;
 278 }
 279
 280 static inline void stw_he_p(void *ptr, uint16_t v)
 281 {
 282     memcpy(ptr, &v, sizeof(v));
 283 }
 284
 285 static inline int ldl_he_p(const void *ptr)
 286 {
 287     int32_t r;
 288     memcpy(&r, ptr, sizeof(r));
 289     return r;
 290 }
 291
 292 static inline void stl_he_p(void *ptr, uint32_t v)
 293 {
 294     memcpy(ptr, &v, sizeof(v));
 295 }
 296
 297 static inline uint64_t ldq_he_p(const void *ptr)
 298 {
 299     uint64_t r;
 300     memcpy(&r, ptr, sizeof(r));
 301     return r;
 302 }
 303
 304 static inline void stq_he_p(void *ptr, uint64_t v)
 305 {
 306     memcpy(ptr, &v, sizeof(v));
 307 }
 308
 309 static inline int lduw_le_p(const void *ptr)
 310 {
 311     return (uint16_t)le_bswap(lduw_he_p(ptr), 16);
 312 }
 313
 314 static inline int ldsw_le_p(const void *ptr)
 315 {
 316     return (int16_t)le_bswap(lduw_he_p(ptr), 16);
 317 }
 318
 319 static inline int ldl_le_p(const void *ptr)
 320 {
 321     return le_bswap(ldl_he_p(ptr), 32);
 322 }
 323
 324 static inline uint64_t ldq_le_p(const void *ptr)
 325 {
 326     return le_bswap(ldq_he_p(ptr), 64);
 327 }
 328
 329 static inline void stw_le_p(void *ptr, uint16_t v)
 330 {
 331     stw_he_p(ptr, le_bswap(v, 16));
 332 }
 333
 334 static inline void stl_le_p(void *ptr, uint32_t v)
 335 {
 336     stl_he_p(ptr, le_bswap(v, 32));
 337 }
 338
 339 static inline void stq_le_p(void *ptr, uint64_t v)
 340 {
 341     stq_he_p(ptr, le_bswap(v, 64));
 342 }
 343
 344 /* float access */
 345
 346 static inline float32 ldfl_le_p(const void *ptr)
 347 {
 348     CPU_FloatU u;
 349     u.l = ldl_le_p(ptr);
 350     return u.f;
 351 }
 352
 353 static inline void stfl_le_p(void *ptr, float32 v)
 354 {
 355     CPU_FloatU u;
 356     u.f = v;
 357     stl_le_p(ptr, u.l);
 358 }
 359
 360 static inline float64 ldfq_le_p(const void *ptr)
 361 {
 362     CPU_DoubleU u;
 363     u.ll = ldq_le_p(ptr);
 364     return u.d;
 365 }
 366
 367 static inline void stfq_le_p(void *ptr, float64 v)
 368 {
 369     CPU_DoubleU u;
 370     u.d = v;
 371     stq_le_p(ptr, u.ll);
 372 }
 373
 374 static inline int lduw_be_p(const void *ptr)
 375 {
 376     return (uint16_t)be_bswap(lduw_he_p(ptr), 16);
 377 }
 378
 379 static inline int ldsw_be_p(const void *ptr)
 380 {
 381     return (int16_t)be_bswap(lduw_he_p(ptr), 16);
 382 }
 383
 384 static inline int ldl_be_p(const void *ptr)
 385 {
 386     return be_bswap(ldl_he_p(ptr), 32);
 387 }
 388
 389 static inline uint64_t ldq_be_p(const void *ptr)
 390 {
 391     return be_bswap(ldq_he_p(ptr), 64);
 392 }
 393
 394 static inline void stw_be_p(void *ptr, uint16_t v)
 395 {
 396     stw_he_p(ptr, be_bswap(v, 16));
 397 }
 398
 399 static inline void stl_be_p(void *ptr, uint32_t v)
 400 {
 401     stl_he_p(ptr, be_bswap(v, 32));
 402 }
 403
 404 static inline void stq_be_p(void *ptr, uint64_t v)
 405 {
 406     stq_he_p(ptr, be_bswap(v, 64));
 407 }
 408
 409 /* float access */
 410
 411 static inline float32 ldfl_be_p(const void *ptr)
 412 {
 413     CPU_FloatU u;
 414     u.l = ldl_be_p(ptr);
 415     return u.f;
 416 }
 417
 418 static inline void stfl_be_p(void *ptr, float32 v)
 419 {
 420     CPU_FloatU u;
 421     u.f = v;
 422     stl_be_p(ptr, u.l);
 423 }
 424
 425 static inline float64 ldfq_be_p(const void *ptr)
 426 {
 427     CPU_DoubleU u;
 428     u.ll = ldq_be_p(ptr);
 429     return u.d;
 430 }
 431
 432 static inline void stfq_be_p(void *ptr, float64 v)
 433 {
 434     CPU_DoubleU u;
 435     u.d = v;
 436     stq_be_p(ptr, u.ll);
 437 }
 438
 439 static inline unsigned long leul_to_cpu(unsigned long v)
 440 {
 441 #if HOST_LONG_BITS == 32
 442     return le_bswap(v, 32);
 443 #elif HOST_LONG_BITS == 64
 444     return le_bswap(v, 64);
 445 #else
 446 # error Unknown sizeof long
 447 #endif
 448 }
 449
 450 #undef le_bswap
 451 #undef be_bswap
 452 #undef le_bswaps
 453 #undef be_bswaps
 454
 455 #endif /* BSWAP_H */