tools/nolibc: add abs() and friends

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-b

tools/nolibc: add abs() and friends

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-6-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add getrandom()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Wil

tools/nolibc: add getrandom()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-5-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add mremap()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy

tools/nolibc: add mremap()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-4-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add %m printf format

The %m format can be used to format the current errno.
It is non-standard but supported by other commonly used libcs like glibc and
musl, so applications do rely o

tools/nolibc: add %m printf format

The %m format can be used to format the current errno.
It is non-standard but supported by other commonly used libcs like glibc and
musl, so applications do rely on them.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-2-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: add strstr()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy

tools/nolibc: add strstr()

This is used in various selftests and will be handy when integrating
those with nolibc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-1-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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tools/nolibc: Add m68k support

Add nolibc support for m68k. Should be helpful for nommu where
linking libc can bloat even hello world to the point where you get
an OOM just trying to load it.

Signe

tools/nolibc: Add m68k support

Add nolibc support for m68k. Should be helpful for nommu where
linking libc can bloat even hello world to the point where you get
an OOM just trying to load it.

Signed-off-by: Daniel Palmer <daniel@thingy.jp>
Link: https://lore.kernel.org/r/20250426224738.284874-1-daniel@0x0f.com
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

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selftests/nolibc: always run nolibc header check

Prevent regressions of issues validates by the header check by always
running it together with the nolibc selftests.

Signed-off-by: Thomas Weißschuh

selftests/nolibc: always run nolibc header check

Prevent regressions of issues validates by the header check by always
running it together with the nolibc selftests.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250424-nolibc-header-check-v1-3-011576b6ed6f@linutronix.de

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tools/nolibc: implement width padding in printf()

printf can pad each argument to a certain width.
Implement this for compatibility with the kselftest harness.
Currently only padding with spaces is

tools/nolibc: implement width padding in printf()

printf can pad each argument to a certain width.
Implement this for compatibility with the kselftest harness.
Currently only padding with spaces is supported.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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selftests/nolibc: add test for snprintf() truncation

Now that we have a proper snprintf() implementation,
make sure truncation is handled properly.

Signed-off-by: Thomas Weißschuh <thomas.weissschu

selftests/nolibc: add test for snprintf() truncation

Now that we have a proper snprintf() implementation,
make sure truncation is handled properly.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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selftests/nolibc: rename vfprintf test suite

With the addition of snprintf() and its usage in nolibc-test, the name of
the "vfprintf" test suite is not accurate anymore.

Rename the suite to be more

selftests/nolibc: rename vfprintf test suite

With the addition of snprintf() and its usage in nolibc-test, the name of
the "vfprintf" test suite is not accurate anymore.

Rename the suite to be more generic.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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selftests/nolibc: use snprintf() for printf tests

With a proper snprintf() implementation in place, the ugly pipe usage is
not necessary anymore.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@

selftests/nolibc: use snprintf() for printf tests

With a proper snprintf() implementation in place, the ugly pipe usage is
not necessary anymore.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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Revert "selftests/nolibc: use waitid() over waitpid()"

nolibc's waitpid() now uses the waitid() syscall internally.
This removes the original reasoning for the reverted commit as
waitpid() is now av

Revert "selftests/nolibc: use waitid() over waitpid()"

nolibc's waitpid() now uses the waitid() syscall internally.
This removes the original reasoning for the reverted commit as
waitpid() is now available on all platforms and has an easier interface.

Switch back to waitpid().

This reverts commit a0bc8947ac731ff95a56e0c1737e69e8c56d5b78.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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tools/nolibc: add tolower() and toupper()

The kselftest harness uses these functions.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

tools/nolibc: handle intmax_t/uintmax_t in printf

In nolibc intmax_t and uintmax_t are always the same as
(unsigned) long long/uint64_t as 128bit numbers are not supported.
Even libcs that do suppor

tools/nolibc: handle intmax_t/uintmax_t in printf

In nolibc intmax_t and uintmax_t are always the same as
(unsigned) long long/uint64_t as 128bit numbers are not supported.
Even libcs that do support 128bit numbers often fix intmax_t to 64bit
as it is used in ABIs and any change would break those.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>

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selftests/nolibc: enable UBSAN if available

UBSAN detects undefined behaviour at runtime.
To avoid introduction of new UB, enable UBSAN for nolibc-test.

By signalling detected errors through traps

selftests/nolibc: enable UBSAN if available

UBSAN detects undefined behaviour at runtime.
To avoid introduction of new UB, enable UBSAN for nolibc-test.

By signalling detected errors through traps no runtime dependency
is necessary.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-7-060b8a016917@weissschuh.net

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selftests/nolibc: disable ubsan for smash_stack()

smash_stack() intentionally crashes.

Prevent UBSAN from tripping over it.

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

selftests/nolibc: disable ubsan for smash_stack()

smash_stack() intentionally crashes.

Prevent UBSAN from tripping over it.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-6-060b8a016917@weissschuh.net

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tools/nolibc: Add support for SPARC

Add support for 32bit and 64bit SPARC to nolibc.

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

tools/nolibc: Add support for SPARC

Add support for 32bit and 64bit SPARC to nolibc.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Tested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> # UltraSparc T4 (Niagara4)
Link: https://lore.kernel.org/lkml/20250322-nolibc-sparc-v2-1-89af018c6296@weissschuh.net/

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selftests/nolibc: only consider XARCH for CFLAGS when requested

If no explicit XARCH is specified, use the toolchains default.

Suggested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Link

selftests/nolibc: only consider XARCH for CFLAGS when requested

If no explicit XARCH is specified, use the toolchains default.

Suggested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Link: https://lore.kernel.org/lkml/20250326205434.bPx_kVUx@breakpoint.cc/
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250402-nolibc-nolibc-test-native-v1-2-62f2f8585220@weissschuh.net

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selftests/nolibc: drop dependency from sysroot to defconfig

The creation of the sysroot does not require a kernel configuration.

Drop the dependency.

Signed-off-by: Thomas Weißschuh <linux@weisssc

selftests/nolibc: drop dependency from sysroot to defconfig

The creation of the sysroot does not require a kernel configuration.

Drop the dependency.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250402-nolibc-nolibc-test-native-v1-1-62f2f8585220@weissschuh.net

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selftests/nolibc: drop unnecessary sys/io.h include

The include of sys/io.h is not necessary anymore since
commit 67eb617a8e1e ("selftests/nolibc: simplify call to ioperm").
It's existence is also p

selftests/nolibc: drop unnecessary sys/io.h include

The include of sys/io.h is not necessary anymore since
commit 67eb617a8e1e ("selftests/nolibc: simplify call to ioperm").
It's existence is also problematic as the header does not exist on all
architectures.

Reported-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250324-nolibc-ioperm-v1-1-8a7cfb2876ae@weissschuh.net

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