[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / tools / testing / selftests / bpf / bpf_endian.h

#ifndef __BPF_ENDIAN__
#define __BPF_ENDIAN__

#include <linux/swab.h>

/* LLVM's BPF target selects the endianness of the CPU
 * it compiles on, or the user specifies (bpfel/bpfeb),
 * respectively. The used __BYTE_ORDER__ is defined by
 * the compiler, we cannot rely on __BYTE_ORDER from
 * libc headers, since it doesn't reflect the actual
 * requested byte order.
 *
 * Note, LLVM's BPF target has different __builtin_bswapX()
 * semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE
 * in bpfel and bpfeb case, which means below, that we map
 * to cpu_to_be16(). We could use it unconditionally in BPF
 * case, but better not rely on it, so that this header here
 * can be used from application and BPF program side, which
 * use different targets.
 */
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define __bpf_ntohs(x)			__builtin_bswap16(x)
# define __bpf_htons(x)			__builtin_bswap16(x)
# define __bpf_constant_ntohs(x)	___constant_swab16(x)
# define __bpf_constant_htons(x)	___constant_swab16(x)
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define __bpf_ntohs(x)			(x)
# define __bpf_htons(x)			(x)
# define __bpf_constant_ntohs(x)	(x)
# define __bpf_constant_htons(x)	(x)
#else
# error "Fix your compiler's __BYTE_ORDER__?!"
#endif

#define bpf_htons(x)				\
	(__builtin_constant_p(x) ?		\
	 __bpf_constant_htons(x) : __bpf_htons(x))
#define bpf_ntohs(x)				\
	(__builtin_constant_p(x) ?		\
	 __bpf_constant_ntohs(x) : __bpf_ntohs(x))

#endif /* __BPF_ENDIAN__ */
Commit	Line	Data
bc1bafbb DM	1	#ifndef __BPF_ENDIAN__
	2	#define __BPF_ENDIAN__
	3
78a5a93c	4	#include <linux/swab.h>
bc1bafbb	5
78a5a93c DB	6	/* LLVM's BPF target selects the endianness of the CPU
	7	* it compiles on, or the user specifies (bpfel/bpfeb),
	8	* respectively. The used __BYTE_ORDER__ is defined by
	9	* the compiler, we cannot rely on __BYTE_ORDER from
	10	* libc headers, since it doesn't reflect the actual
	11	* requested byte order.
	12	*
	13	* Note, LLVM's BPF target has different __builtin_bswapX()
	14	* semantics. It does map to BPF_ALU \| BPF_END \| BPF_TO_BE
	15	* in bpfel and bpfeb case, which means below, that we map
	16	* to cpu_to_be16(). We could use it unconditionally in BPF
	17	* case, but better not rely on it, so that this header here
	18	* can be used from application and BPF program side, which
	19	* use different targets.
	20	*/
	21	#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
	22	# define __bpf_ntohs(x) __builtin_bswap16(x)
	23	# define __bpf_htons(x) __builtin_bswap16(x)
	24	# define __bpf_constant_ntohs(x) ___constant_swab16(x)
	25	# define __bpf_constant_htons(x) ___constant_swab16(x)
	26	#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	27	# define __bpf_ntohs(x) (x)
	28	# define __bpf_htons(x) (x)
	29	# define __bpf_constant_ntohs(x) (x)
	30	# define __bpf_constant_htons(x) (x)
bc1bafbb	31	#else
78a5a93c	32	# error "Fix your compiler's __BYTE_ORDER__?!"
bc1bafbb DM	33	#endif
	34
	35	#define bpf_htons(x) \
	36	(__builtin_constant_p(x) ? \
78a5a93c	37	__bpf_constant_htons(x) : __bpf_htons(x))
bc1bafbb DM	38	#define bpf_ntohs(x) \
bc1bafbb DM	39	(__builtin_constant_p(x) ? \
78a5a93c	40	__bpf_constant_ntohs(x) : __bpf_ntohs(x))
bc1bafbb	41
78a5a93c	42	#endif /* __BPF_ENDIAN__ */