include/exec/tswap.h

   1 /*
   2  * Macros for swapping a value if the endianness is different
   3  * between the target and the host.
   4  *
   5  * SPDX-License-Identifier: LGPL-2.1-or-later
   6  */
   7
   8 #ifndef TSWAP_H
   9 #define TSWAP_H
  10
  11 #include "hw/core/cpu.h"
  12 #include "qemu/bswap.h"
  13
  14 /*
  15  * If we're in target-specific code, we can hard-code the swapping
  16  * condition, otherwise we have to do (slower) run-time checks.
  17  */
  18 #ifdef NEED_CPU_H
  19 #define target_needs_bswap()  (HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN)
  20 #else
  21 #define target_needs_bswap()  (target_words_bigendian() != HOST_BIG_ENDIAN)
  22 #endif
  23
  24 static inline uint16_t tswap16(uint16_t s)
  25 {
  26     if (target_needs_bswap()) {
  27         return bswap16(s);
  28     } else {
  29         return s;
  30     }
  31 }
  32
  33 static inline uint32_t tswap32(uint32_t s)
  34 {
  35     if (target_needs_bswap()) {
  36         return bswap32(s);
  37     } else {
  38         return s;
  39     }
  40 }
  41
  42 static inline uint64_t tswap64(uint64_t s)
  43 {
  44     if (target_needs_bswap()) {
  45         return bswap64(s);
  46     } else {
  47         return s;
  48     }
  49 }
  50
  51 static inline void tswap16s(uint16_t *s)
  52 {
  53     if (target_needs_bswap()) {
  54         *s = bswap16(*s);
  55     }
  56 }
  57
  58 static inline void tswap32s(uint32_t *s)
  59 {
  60     if (target_needs_bswap()) {
  61         *s = bswap32(*s);
  62     }
  63 }
  64
  65 static inline void tswap64s(uint64_t *s)
  66 {
  67     if (target_needs_bswap()) {
  68         *s = bswap64(*s);
  69     }
  70 }
  71
  72 #endif  /* TSWAP_H */