tools/nolibc: add byteorder conversions

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

Signed-off-by: T

tools/nolibc: add byteorder conversions

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

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tools/nolibc: explicitly list architecture headers

Relying on $(wildcard) is brittle and non-deterministic.

similar to all the other headers.
Switch the list of architecture headers to an explicit

tools/nolibc: explicitly list architecture headers

Relying on $(wildcard) is brittle and non-deterministic.

similar to all the other headers.
Switch the list of architecture headers to an explicit list,

Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-4-bcf4c9f5c1be@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: drop superfluous definition of Q

Q is already defined by tools/scripts/Makefile.include which is included
at the top of tools/include/nolibc/Makefile.

Signed-off-by: Thomas Weißschuh

tools/nolibc: drop superfluous definition of Q

Q is already defined by tools/scripts/Makefile.include which is included
at the top of tools/include/nolibc/Makefile.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-3-bcf4c9f5c1be@weissschuh.net

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tools/nolibc: drop superfluous invocation of mkdir

The call to 'mkdir -p $(OUTPUT)sysroot/include' will also create the
sysroot directory.

Drop the unnecessary explicit invocation of mkdir.

Signed

tools/nolibc: drop superfluous invocation of mkdir

The call to 'mkdir -p $(OUTPUT)sysroot/include' will also create the
sysroot directory.

Drop the unnecessary explicit invocation of mkdir.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-2-bcf4c9f5c1be@weissschuh.net

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tools/nolibc: drop superfluous invocation of 'make headers'

The headers_install target of the toplevel Makefile will already make
sure that the headers are up-to-date.

Drop the superfluous explicit

tools/nolibc: drop superfluous invocation of 'make headers'

The headers_install target of the toplevel Makefile will already make
sure that the headers are up-to-date.

Drop the superfluous explicit invocation.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://patch.msgid.link/20260401-nolibc-cleanup-v1-1-bcf4c9f5c1be@weissschuh.net

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tools/nolibc: add err.h

Add a few convenient helpers to print error and warning messages.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://pat

tools/nolibc: add err.h

Add a few convenient helpers to print error and warning messages.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://patch.msgid.link/20260318-nolibc-err-h-v4-2-08247a694bd9@weissschuh.net

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tools/nolibc: always use 64-bit mode for s390 header checks

32-bit s390 support was recently removed from nolibc.
If the compiler defaults to 32-bit during the header checks, they fail.

Make sure t

tools/nolibc: always use 64-bit mode for s390 header checks

32-bit s390 support was recently removed from nolibc.
If the compiler defaults to 32-bit during the header checks, they fail.

Make sure to always use 64-bit mode for s390 heafer checks.

Fixes: 169ebcbb9082 ("tools: Remove s390 compat support")
Acked-by: Willy Tarreau <w@1wt.eu>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://patch.msgid.link/20251203-nolibc-headers-check-s390-v1-1-5d35e52a83ba@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add ptrace support

Add ptrace support, as it will be useful in UML.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
[Thomas: drop va_args usage and linux/uio.h inclusion]
Signe

tools/nolibc: add ptrace support

Add ptrace support, as it will be useful in UML.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
[Thomas: drop va_args usage and linux/uio.h inclusion]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: make the "headers" target install all supported archs

The efforts we go through by installing a single arch are counter
productive when the base directory already supports them all, an

tools/nolibc: make the "headers" target install all supported archs

The efforts we go through by installing a single arch are counter
productive when the base directory already supports them all, and
the arch-specific files are really small. Let's make the "headers"
target simply install headers for all supported archs and stop
trying to build a hybrid "arch.h" file on the fly, to instead keep
the generic one. Now the same nolibc headers installation will be
usable with any arch-specific uapi installation.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add the more portable inttypes.h

It's often recommended to only use inttypes.h instead of stdint.h for
portability reasons since the former is always present when the latter
is present

tools/nolibc: add the more portable inttypes.h

It's often recommended to only use inttypes.h instead of stdint.h for
portability reasons since the former is always present when the latter
is present, but not conversely, and the former includes the latter. Due
to this some simple programs fail to build when including inttypes.h.
Let's add one that simply includes nolibc.h to better support these
programs.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: provide the portable sys/select.h

Modern programs tend to include sys/select.h to get FD_SET() and
FD_CLR() definitions as well as struct fd_set, but in our case it
didn't exist.

The

tools/nolibc: provide the portable sys/select.h

Modern programs tend to include sys/select.h to get FD_SET() and
FD_CLR() definitions as well as struct fd_set, but in our case it
didn't exist.

The definitions were moved from types.h to sys/select.h, which is
now included from nolibc.h, and the sys_select() definition moved
there as well from sys.h.

Signed-off-by: Willy Tarreau <w@1wt.eu>
[Thomas: adapt to current -next branch]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: fix misleading help message regarding installation path

The help message says the headers are going to be installed into
tools/include/nolibc but this is only the default if $OUTPUT is

tools/nolibc: fix misleading help message regarding installation path

The help message says the headers are going to be installed into
tools/include/nolibc but this is only the default if $OUTPUT is not set,
so better clarify this (the current value of $OUTPUT is already shown).

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add uio.h with readv and writev

This is generally useful and struct iovec is also needed for other
purposes such as ptrace.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Sign

tools/nolibc: add uio.h with readv and writev

This is generally useful and struct iovec is also needed for other
purposes such as ptrace.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: drop s390 clang target override

tools/scripts/Makefile.include now has the same override,
removing the need for the one in the nolibc Makefile.

Drop the superfluous custom override.

tools/nolibc: drop s390 clang target override

tools/scripts/Makefile.include now has the same override,
removing the need for the one in the nolibc Makefile.

Drop the superfluous custom override.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://lore.kernel.org/r/20250620-tools-cross-s390-v2-2-ecda886e00e5@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: use arm64 name over aarch64

Nolibc generally uses the kernel's architecture names.
aarch64 is the only exception.

Remove the special case.
Nothing changes for the users.

Acked-by: Wi

tools/nolibc: use arm64 name over aarch64

Nolibc generally uses the kernel's architecture names.
aarch64 is the only exception.

Remove the special case.
Nothing changes for the users.

Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250623-nolibc-aarch64-arm64-v1-1-a2892f1c1b27@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: hide headers_check command by default

If V=1 is not specified the executed commands should not be printed.

Hide the commands by default.

Fixes: a6a054c8ad32 ("tools/nolibc: add targe

tools/nolibc: hide headers_check command by default

If V=1 is not specified the executed commands should not be printed.

Hide the commands by default.

Fixes: a6a054c8ad32 ("tools/nolibc: add target to check header usability")
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250623-nolibc-headers-silent-v1-1-f568facf014c@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: merge i386 and x86_64 into a single x86 arch

This remained the only exception to the kernel's architectures
organization and it's always a bit cumbersome to deal with. Let's merge
i386

tools/nolibc: merge i386 and x86_64 into a single x86 arch

This remained the only exception to the kernel's architectures
organization and it's always a bit cumbersome to deal with. Let's merge
i386 and x86_64 into x86. This will result in a single arch-x86.h file
by default, and we'll no longer need to merge the two manually during
installation. Requesting either i386 or x86_64 will also result in
installing x86.

Acked-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>

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tools/nolibc: move NULL and offsetof() to sys/stddef.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarre

tools/nolibc: move NULL and offsetof() to sys/stddef.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-8-74f82eea3b59@weissschuh.net

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tools/nolibc: move uname() and friends to sys/utsname.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarr

tools/nolibc: move uname() and friends to sys/utsname.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-7-74f82eea3b59@weissschuh.net

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tools/nolibc: move makedev() and friends to sys/sysmacros.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy

tools/nolibc: move makedev() and friends to sys/sysmacros.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-6-74f82eea3b59@weissschuh.net

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tools/nolibc: move getrlimit() and friends to sys/resource.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy

tools/nolibc: move getrlimit() and friends to sys/resource.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-5-74f82eea3b59@weissschuh.net

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tools/nolibc: move reboot() to sys/reboot.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>

tools/nolibc: move reboot() to sys/reboot.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-4-74f82eea3b59@weissschuh.net

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tools/nolibc: move prctl() to sys/prctl.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
L

tools/nolibc: move prctl() to sys/prctl.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-3-74f82eea3b59@weissschuh.net

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tools/nolibc: move mount() to sys/mount.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
L

tools/nolibc: move mount() to sys/mount.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-2-74f82eea3b59@weissschuh.net

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tools/nolibc: move ioctl() to sys/ioctl.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
L

tools/nolibc: move ioctl() to sys/ioctl.h

This is the location regular userspace expects this definition.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250515-nolibc-sys-v1-1-74f82eea3b59@weissschuh.net

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