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2025-05-21tools/nolibc: add mremap()Thomas Weißschuh2-3/+30
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>
2025-05-21tools/nolibc: add more stat() variantsThomas Weißschuh1-2/+23
Add fstat(), fstatat() and lstat(). All of them use the existing implementation based on statx(). 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-v2-3-3c043eeab06c@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-05-21tools/nolibc: add %m printf formatThomas Weißschuh2-0/+25
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>
2025-05-21tools/nolibc: add strstr()Thomas Weißschuh2-0/+23
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>
2025-05-21tools/nolibc: use poll-related definitions from UAPI headersThomas Weißschuh2-15/+1
The UAPI headers already provide definitions for these symbols. Using them makes the code shorter, more robust and compatible with applications using linux/poll.h directly. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250430-poll-v1-2-44b5ceabdeee@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-05-21tools/nolibc: move poll() to poll.hThomas Weißschuh4-37/+57
This is the location regular userspace expects the definition. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250430-poll-v1-1-44b5ceabdeee@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-05-21tools/nolibc: Add m68k supportDaniel Palmer4-0/+153
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>
2025-05-21selftests/nolibc: always run nolibc header checkThomas Weißschuh1-1/+1
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
2025-05-21tools/nolibc: include nolibc.h early from all header filesThomas Weißschuh20-63/+60
Inclusion of any nolibc header file should also bring all other headers. On the other hand it should also be possible to include any nolibc header files in any order. Currently this is implemented by including the catch-all nolibc.h after the headers own definitions. This is problematic if one nolibc header depends on another one. The first header has to include the other one before defining any symbols. That in turn will include the rest of nolibc while the current header has not defined anything yet. If any other part of nolibc depends on definitions from the current header, errors are encountered. This is already the case today. Effectively nolibc can only be included in the order of nolibc.h. Restructure the way "nolibc.h" is included. Move it to the beginning of the header files and before the include guards. Now any header will behave exactly like "nolibc.h" while the include guards prevent any duplicate definitions. 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-v1-2-011576b6ed6f@linutronix.de
2025-05-21tools/nolibc: add target to check header usabilityThomas Weißschuh1-0/+9
Each nolibc header should be valid for inclusion irrespective of any special ordering requirements. Add a new make target, based on the old kbuild "make header_check" target to validate this requirement. For now the check fails, but the following commits will fix the issues. 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-v1-1-011576b6ed6f@linutronix.de
2025-04-22tools/nolibc: implement width padding in printf()Thomas Weißschuh2-1/+19
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>
2025-04-22selftests/nolibc: add test for snprintf() truncationThomas Weißschuh1-1/+3
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>
2025-04-22selftests/nolibc: rename vfprintf test suiteThomas Weißschuh1-2/+2
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>
2025-04-22selftests/nolibc: use snprintf() for printf testsThomas Weißschuh1-27/+3
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>
2025-04-22tools/nolibc: add snprintf() and friendsThomas Weißschuh1-0/+55
Add more of the printf() functions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: allow limiting of printf destination sizeThomas Weißschuh1-6/+10
snprintf() allows limiting the output buffer, while still returning the number of all bytes that would have been written. Implement the limitation logic in preparation for snprintf(). Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: allow different write callbacks in printfThomas Weißschuh1-4/+17
Decouple the formatting logic from the writing logic to later enable writing straight to a buffer in sprintf(). Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: add getopt()Thomas Weißschuh3-0/+103
Introduce a getopt() implementation based on the one from musl. The only deviations are adaption to the kernel coding style and nolibc infrastructure and removal of multi-byte support. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: add dprintf() and vdprintf()Thomas Weißschuh1-0/+24
dprintf() and vdprintf() are printf() variants printing directly into a filedescriptor. As FILE in nolibc is based directly on filedescriptors, the implementation is trivial. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22Revert "selftests/nolibc: use waitid() over waitpid()"Thomas Weißschuh1-6/+4
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>
2025-04-22tools/nolibc: implement waitpid() in terms of waitid()Thomas Weißschuh1-12/+58
The old wait4() syscall used by waitpid() before is not available everywhere. Switch to the waitid() syscall which is the new replacement. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: add setpgrp()Thomas Weißschuh1-0/+10
setpgrp() is defined to be identical to setpgid(0, 0). Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: add _exit()Thomas Weißschuh1-1/+7
_exit() is the faster variant of exit(), skipping all cleanup actions. As nolibc does not perform any cleanup anyways, the implementation is trivial. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: add tolower() and toupper()Thomas Weißschuh2-0/+22
The kselftest harness uses these functions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: use ppoll_time64 if availableThomas Weißschuh1-0/+8
riscv32 does not have any of the older poll systemcalls. Use ppoll_time64 instead. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: use pselect6_time64 if availableThomas Weißschuh1-0/+8
riscv32 does not have any of the older select systemcalls. Use pselect6_time64 instead. poll() is also used to implement sleep(). Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: use intmax definitions from compilerThomas Weißschuh1-2/+2
The printf format checking in the compiler uses the intmax types from the compiler, not libc. This can lead to compiler errors. Instead use the types already provided by the compiler. Example issue with clang 19 for arm64: nolibc-test.c:30:2: error: format specifies type 'uintmax_t' (aka 'unsigned long') but the argument has type 'uintmax_t' (aka 'unsigned long long') [-Werror,-Wformat] Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu>
2025-04-22tools/nolibc: handle intmax_t/uintmax_t in printfThomas Weißschuh2-0/+4
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>
2025-04-19tools/nolibc: move wait() and friends to sys/wait.hThomas Weißschuh4-53/+73
This is the location regular userspace expects these definitions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-10-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: add sys/types.h shimThomas Weißschuh2-0/+8
This is the location regular userspace expects the header. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-9-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move gettimeofday() to sys/time.hThomas Weißschuh4-21/+38
This is the location regular userspace expects this definition. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-8-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move syscall() to sys/syscall.hThomas Weißschuh4-6/+21
This is the location regular userspace expects the definition. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-7-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move stat() and friends to sys/stat.hThomas Weißschuh4-56/+76
This is the location regular userspace expects these definitions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-6-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move mmap() and friends to sys/mman.hThomas Weißschuh4-48/+65
This is the location regular userspace expects these definitions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-5-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move getauxval() to sys/auxv.hThomas Weißschuh4-26/+43
This is the location regular userspace expects the definition. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-4-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: move open() and friends to fcntl.hThomas Weißschuh5-52/+72
This is the location regular userspace expects these definitions. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-3-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: add elf.hThomas Weißschuh3-0/+17
The UAPI header do already provide an elf.h implementation. Reexport it under its libc name. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-2-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19tools/nolibc: prepare for headers in subdirectoriesThomas Weißschuh1-1/+1
To support headers in subdirectories (like sys/), their subdirectory needs to be preserved during installation into the sysroot. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250416-nolibc-split-sys-v1-1-a069a3f1d145@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
2025-04-19selftests/nolibc: enable UBSAN if availableThomas Weißschuh1-1/+2
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
2025-04-19selftests/nolibc: disable ubsan for smash_stack()Thomas Weißschuh1-0/+1
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
2025-04-19tools/nolibc: fix integer overflow in i{64,}toa_r() andThomas Weißschuh1-2/+2
In twos complement the most negative number can not be negated. Fixes: b1c21e7d99cd ("tools/nolibc/stdlib: add i64toa() and u64toa()") Fixes: 66c397c4d2e1 ("tools/nolibc/stdlib: replace the ltoa() function with more efficient ones") Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-5-060b8a016917@weissschuh.net
2025-04-19tools/nolibc: properly align dirent bufferThomas Weißschuh1-1/+2
As byte buffer is overlaid with a 'struct dirent64'. it has to satisfy the structs alignment requirements. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Fixes: 665fa8dea90d ("tools/nolibc: add support for directory access") Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-4-060b8a016917@weissschuh.net
2025-04-19tools/nolibc: disable function sanitizer for _start_c()Thomas Weißschuh1-0/+5
Both constructors and main() may be executed with different function signatures than they are actually using. This is intentional but trips up UBSAN. Disable the function sanitizer of UBSAN in _start_c(). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-3-060b8a016917@weissschuh.net
2025-04-19tools/nolibc: add __nolibc_aligned() and __nolibc_aligned_as()Thomas Weißschuh1-0/+3
Provide a convenience macro around __attribute__((aligned)). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-2-060b8a016917@weissschuh.net
2025-04-19tools/nolibc: add __nolibc_has_feature()Thomas Weißschuh1-0/+6
Certain compiler features are signaled via the __has_feature() preprocessor builtin. Add a nolibc wrapper for it, similar to __nolibc_has_attribute(). Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250419-nolibc-ubsan-v2-1-060b8a016917@weissschuh.net
2025-04-14tools/nolibc: drop manual stack pointer alignmentThomas Weißschuh7-16/+0
The stack pointer is already aligned by the kernel to a multiple of 16. See STACK_ROUND() in fs/binfmt_elf.c. The manual realignment is unnecessary, drop it. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250316-nolibc-sp-align-v1-1-1e1fb073ca1e@weissschuh.net
2025-04-11tools/nolibc: Add support for SPARCThomas Weißschuh4-0/+206
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/
2025-04-11selftests/nolibc: only consider XARCH for CFLAGS when requestedThomas Weißschuh1-1/+4
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
2025-04-11selftests/nolibc: drop dependency from sysroot to defconfigThomas Weißschuh1-1/+1
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
2025-04-11tools/nolibc/types.h: fix mismatched parenthesis in minor()Jemmy Wong1-1/+1
Fix an imbalance where opening parentheses exceed closing ones. Fixes: eba6d00d38e7c ("tools/nolibc/types: move makedev to types.h and make it a macro") Signed-off-by: Jemmy Wong <jemmywong512@gmail.com> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250411073624.22153-1-jemmywong512@gmail.com Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
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