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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _OBJTOOL_ENDIANNESS_H
#define _OBJTOOL_ENDIANNESS_H
#include <linux/kernel.h>
#include <endian.h>
#include <objtool/elf.h>
/*
* Does a byte swap if target file endianness doesn't match the host, i.e. cross
* compilation for little endian on big endian and vice versa.
* To be used for multi-byte values conversion, which are read from / about
* to be written to a target native endianness ELF file.
*/
static inline bool need_bswap(struct elf *elf)
{
return (__BYTE_ORDER == __LITTLE_ENDIAN) ^
(elf->ehdr.e_ident[EI_DATA] == ELFDATA2LSB);
}
#define bswap_if_needed(elf, val) \
({ \
__typeof__(val) __ret; \
bool __need_bswap = need_bswap(elf); \
switch (sizeof(val)) { \
case 8: \
__ret = __need_bswap ? bswap_64(val) : (val); break; \
case 4: \
__ret = __need_bswap ? bswap_32(val) : (val); break; \
case 2: \
__ret = __need_bswap ? bswap_16(val) : (val); break; \
default: \
BUILD_BUG(); break; \
} \
__ret; \
})
#endif /* _OBJTOOL_ENDIANNESS_H */
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