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tools/nolibc: add byteorder conversions

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Add some standard functions to convert between different byte orders.
Conveniently the UAPI headers provide all the necessary functionality.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260405-nolibc-bswap-v1-1-f7699ca9cee0@weissschuh.net
This commit is contained in:
Thomas Weißschuh
2026-04-05 17:31:05 +02:00
parent 2eb64b936d
commit ce834c9cb9
5 changed files with 70 additions and 0 deletions
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2
tools/include/nolibc/Makefile
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@@ -20,11 +20,13 @@ OUTPUT ?= $(CURDIR)/
architectures := arm arm64 loongarch m68k mips powerpc riscv s390 sh sparc x86
arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
all_files := \
byteswap.h \
compiler.h \
crt.h \
ctype.h \
dirent.h \
elf.h \
endian.h \
err.h \
errno.h \
fcntl.h \

21
tools/include/nolibc/byteswap.h Normal file
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@@ -0,0 +1,21 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* Byte swapping for NOLIBC
* Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
*/
/* make sure to include all global symbols */
#include "nolibc.h"
#ifndef _NOLIBC_BYTESWAP_H
#define _NOLIBC_BYTESWAP_H
#include "stdint.h"
#include <linux/swab.h>
#define bswap_16(_x) __swab16(_x)
#define bswap_32(_x) __swab32(_x)
#define bswap_64(_x) __swab64(_x)
#endif /* _NOLIBC_BYTESWAP_H */

32
tools/include/nolibc/endian.h Normal file
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@@ -0,0 +1,32 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* Byte order conversion for NOLIBC
* Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
*/
/* make sure to include all global symbols */
#include "nolibc.h"
#ifndef _NOLIBC_ENDIAN_H
#define _NOLIBC_ENDIAN_H
#include "stdint.h"
#include <asm/byteorder.h>
#define htobe16(_x) __cpu_to_be16(_x)
#define htole16(_x) __cpu_to_le16(_x)
#define be16toh(_x) __be16_to_cpu(_x)
#define le16toh(_x) __le16_to_cpu(_x)
#define htobe32(_x) __cpu_to_be32(_x)
#define htole32(_x) __cpu_to_le32(_x)
#define be32toh(_x) __be32_to_cpu(_x)
#define le32toh(_x) __le32_to_cpu(_x)
#define htobe64(_x) __cpu_to_be64(_x)
#define htole64(_x) __cpu_to_le64(_x)
#define be64toh(_x) __be64_to_cpu(_x)
#define le64toh(_x) __le64_to_cpu(_x)
#endif /* _NOLIBC_ENDIAN_H */

2
tools/include/nolibc/nolibc.h
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@@ -131,6 +131,8 @@
#include "poll.h"
#include "math.h"
#include "err.h"
#include "byteswap.h"
#include "endian.h"
/* Used by programs to avoid std includes */
#define NOLIBC