Provide helper macros for fields which represent pointers in kernel-userspace ABI. This facilitates handling of 32-bit user-space by 64-bit kernels by defining those fields as 32-bit 0-padding and 32-bit integer on 32-bit architectures, which allows the kernel to treat those as 64-bit integers. The order of padding and 32-bit integer depends on the endianness.
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| 1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ | ||
| 2 | #ifndef _UAPI_LINUX_TYPES_32_64_H | ||
| 3 | #define _UAPI_LINUX_TYPES_32_64_H | ||
| 4 | |||
| 5 | /* | ||
| 6 | * linux/types_32_64.h | ||
| 7 | * | ||
| 8 | * Integer type declaration for pointers across 32-bit and 64-bit systems. | ||
| 9 | * | ||
| 10 | * Copyright (c) 2015-2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | ||
| 11 | */ | ||
| 12 | |||
| 13 | #ifdef __KERNEL__ | ||
| 14 | # include <linux/types.h> | ||
| 15 | #else | ||
| 16 | # include <stdint.h> | ||
| 17 | #endif | ||
| 18 | |||
| 19 | #include <asm/byteorder.h> | ||
| 20 | |||
| 21 | #ifdef __BYTE_ORDER | ||
| 22 | # if (__BYTE_ORDER == __BIG_ENDIAN) | ||
| 23 | # define LINUX_BYTE_ORDER_BIG_ENDIAN | ||
| 24 | # else | ||
| 25 | # define LINUX_BYTE_ORDER_LITTLE_ENDIAN | ||
| 26 | # endif | ||
| 27 | #else | ||
| 28 | # ifdef __BIG_ENDIAN | ||
| 29 | # define LINUX_BYTE_ORDER_BIG_ENDIAN | ||
| 30 | # else | ||
| 31 | # define LINUX_BYTE_ORDER_LITTLE_ENDIAN | ||
| 32 | # endif | ||
| 33 | #endif | ||
| 34 | |||
| 35 | #ifdef __LP64__ | ||
| 36 | # define LINUX_FIELD_u32_u64(field) __u64 field | ||
| 37 | # define LINUX_FIELD_u32_u64_INIT_ONSTACK(field, v) field = (intptr_t)v | ||
| 38 | #else | ||
| 39 | # ifdef LINUX_BYTE_ORDER_BIG_ENDIAN | ||
| 40 | # define LINUX_FIELD_u32_u64(field) __u32 field ## _padding, field | ||
| 41 | # define LINUX_FIELD_u32_u64_INIT_ONSTACK(field, v) \ | ||
| 42 | field ## _padding = 0, field = (intptr_t)v | ||
| 43 | # else | ||
| 44 | # define LINUX_FIELD_u32_u64(field) __u32 field, field ## _padding | ||
| 45 | # define LINUX_FIELD_u32_u64_INIT_ONSTACK(field, v) \ | ||
| 46 | field = (intptr_t)v, field ## _padding = 0 | ||
| 47 | # endif | ||
| 48 | #endif | ||
| 49 | |||
| 50 | #endif /* _UAPI_LINUX_TYPES_32_64_H */ | ||