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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445/* SPDX-License-Identifier: GPL-2.0 */#ifndef __VDSO_UNALIGNED_H#define __VDSO_UNALIGNED_H
#include <linux/compiler_types.h>
/** * __get_unaligned_t - read an unaligned value from memory. * @type: the type to load from the pointer. * @ptr: the pointer to load from. * * Use memcpy to affect an unaligned type sized load avoiding undefined behavior * from approaches like type punning that require -fno-strict-aliasing in order * to be correct. As type may be const, use __unqual_scalar_typeof to map to a * non-const type - you can't memcpy into a const type. The * __get_unaligned_ctrl_type gives __unqual_scalar_typeof its required * expression rather than type, a pointer is used to avoid warnings about mixing * the use of 0 and NULL. The void* cast silences ubsan warnings. */#define __get_unaligned_t(type, ptr) ({ \ type *__get_unaligned_ctrl_type __always_unused = NULL; \ __unqual_scalar_typeof(*__get_unaligned_ctrl_type) __get_unaligned_val; \ __builtin_memcpy(&__get_unaligned_val, (void *)(ptr), \ sizeof(__get_unaligned_val)); \ __get_unaligned_val; \})
/** * __put_unaligned_t - write an unaligned value to memory. * @type: the type of the value to store. * @val: the value to store. * @ptr: the pointer to store to. * * Use memcpy to affect an unaligned type sized store avoiding undefined * behavior from approaches like type punning that require -fno-strict-aliasing * in order to be correct. The void* cast silences ubsan warnings. */#define __put_unaligned_t(type, val, ptr) do { \ type __put_unaligned_val = (val); \ __builtin_memcpy((void *)(ptr), &__put_unaligned_val, \ sizeof(__put_unaligned_val)); \} while (0)
#endif /* __VDSO_UNALIGNED_H */