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/*
* Macros for swapping a value if the endianness is different
* between the target and the host.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef TSWAP_H
#define TSWAP_H
#include "qemu/bswap.h"
/**
* target_big_endian:
* Returns true if the (default) endianness of the target is big endian,
* false otherwise. Common code should normally never need to know about the
* endianness of the target, so please do *not* use this function unless you
* know very well what you are doing!
*/
bool target_big_endian(void);
#ifdef COMPILING_PER_TARGET
#define target_big_endian() TARGET_BIG_ENDIAN
#endif
/*
* If we're in target-specific code, we can hard-code the swapping
* condition, otherwise we have to do (slower) run-time checks.
*/
#ifdef COMPILING_PER_TARGET
#define target_needs_bswap() (HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN)
#else
#define target_needs_bswap() (HOST_BIG_ENDIAN != target_big_endian())
#endif /* COMPILING_PER_TARGET */
static inline uint16_t tswap16(uint16_t s)
{
if (target_needs_bswap()) {
return bswap16(s);
} else {
return s;
}
}
static inline uint32_t tswap32(uint32_t s)
{
if (target_needs_bswap()) {
return bswap32(s);
} else {
return s;
}
}
static inline uint64_t tswap64(uint64_t s)
{
if (target_needs_bswap()) {
return bswap64(s);
} else {
return s;
}
}
static inline void tswap16s(uint16_t *s)
{
if (target_needs_bswap()) {
*s = bswap16(*s);
}
}
static inline void tswap32s(uint32_t *s)
{
if (target_needs_bswap()) {
*s = bswap32(*s);
}
}
static inline void tswap64s(uint64_t *s)
{
if (target_needs_bswap()) {
*s = bswap64(*s);
}
}
/* Return ld{word}_{le,be}_p following target endianness. */
#define LOAD_IMPL(word, args...) \
do { \
if (target_big_endian()) { \
return glue(glue(ld, word), _be_p)(args); \
} else { \
return glue(glue(ld, word), _le_p)(args); \
} \
} while (0)
static inline int lduw_p(const void *ptr)
{
LOAD_IMPL(uw, ptr);
}
static inline int ldsw_p(const void *ptr)
{
LOAD_IMPL(sw, ptr);
}
static inline int ldl_p(const void *ptr)
{
LOAD_IMPL(l, ptr);
}
static inline uint64_t ldq_p(const void *ptr)
{
LOAD_IMPL(q, ptr);
}
static inline uint64_t ldn_p(const void *ptr, int sz)
{
LOAD_IMPL(n, ptr, sz);
}
#undef LOAD_IMPL
/* Call st{word}_{le,be}_p following target endianness. */
#define STORE_IMPL(word, args...) \
do { \
if (target_big_endian()) { \
glue(glue(st, word), _be_p)(args); \
} else { \
glue(glue(st, word), _le_p)(args); \
} \
} while (0)
static inline void stw_p(void *ptr, uint16_t v)
{
STORE_IMPL(w, ptr, v);
}
static inline void stl_p(void *ptr, uint32_t v)
{
STORE_IMPL(l, ptr, v);
}
static inline void stq_p(void *ptr, uint64_t v)
{
STORE_IMPL(q, ptr, v);
}
static inline void stn_p(void *ptr, int sz, uint64_t v)
{
STORE_IMPL(n, ptr, sz, v);
}
#undef STORE_IMPL
#endif /* TSWAP_H */
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