kernel/tools/include/nolibc/arch.h, branch linux-rolling-stable

Merge tag 'nolibc-20251130-for-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc

2025-12-03T17:23:25Z

Pull nolibc updates from Thomas Weißschuh: - Preparations to the use of nolibc in UML: - Cleanup of sparse warnings - Library mode without _start() - More consistency when disabling errno - Unconditional installation of all architecture support files - Always 64-bit wide ino_t and off_t - Various cleanups and bug fixes * tag 'nolibc-20251130-for-6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc: (25 commits) selftests/nolibc: error out on linker warnings selftests/nolibc: use lld to link loongarch binaries tools/nolibc: remove more __nolibc_enosys() fallbacks tools/nolibc: remove now superfluous overflow check in llseek tools/nolibc: use 64-bit off_t tools/nolibc: prefer the llseek syscall tools/nolibc: handle 64-bit off_t for llseek tools/nolibc: use 64-bit ino_t tools/nolibc: avoid using plain integer as NULL pointer tools/nolibc: add support for fchdir() tools/nolibc: clean up outdated comments in generic arch.h tools/nolibc: make the "headers" target install all supported archs tools/nolibc: add the more portable inttypes.h tools/nolibc: provide the portable sys/select.h tools/nolibc: add missing memchr() to string.h tools/nolibc: fix misleading help message regarding installation path tools/nolibc: add uio.h with readv and writev tools/nolibc: add option to disable runtime tools/nolibc: use __fallthrough__ rather than fallthrough tools/nolibc: implement %m if errno is not defined ...

tools: Remove s390 compat support

2025-11-17T10:10:38Z

Remove s390 compat support from everything within tools, since s390 compat support will be removed from the kernel. Reviewed-by: Arnd Bergmann Acked-by: Thomas Weißschuh # tools/nolibc selftests/nolibc Reviewed-by: Thomas Weißschuh # selftests/vDSO Acked-by: Alexei Starovoitov # bpf bits Signed-off-by: Heiko Carstens

tools/nolibc: clean up outdated comments in generic arch.h

2025-11-02T21:02:43Z

Along the code reorganizations, the file has been keeping the original comments about argv and envp which are no longer relevant to this file anymore. Let's just drop them. Acked-by: Thomas Weißschuh Signed-off-by: Willy Tarreau

tools/nolibc: add support for SuperH

2025-07-04T11:26:07Z

Add support for SuperH/"sh" to nolibc. Only sh4 is tested for now. The startup code is special: __nolibc_entrypoint_epilogue() calls __builtin_unreachable() which emits a call to abort(). To make this work a function prologue is generated to set up a GOT pointer which corrupts "sp". __builtin_unreachable() is necessary for __attribute__((noreturn)). Also depending on compiler flags (for example -fPIC) even more prologue is generated. Work around this by defining a nested function in asm. Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70216 Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Acked-by: Rob Landley Acked-by: D. Jeff Dionne Tested-by: John Paul Adrian Glaubitz Link: https://lore.kernel.org/r/20250623-nolibc-sh-v2-3-0f5b4b303025@weissschuh.net

tools/nolibc: use arm64 name over aarch64

2025-06-24T07:46:52Z

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 Link: https://lore.kernel.org/r/20250623-nolibc-aarch64-arm64-v1-1-a2892f1c1b27@weissschuh.net Signed-off-by: Thomas Weißschuh

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

2025-06-22T07:16:07Z

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 Signed-off-by: Willy Tarreau

tools/nolibc: Add m68k support

2025-05-21T13:31:54Z

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 Link: https://lore.kernel.org/r/20250426224738.284874-1-daniel@0x0f.com Signed-off-by: Thomas Weißschuh

tools/nolibc: Add support for SPARC

2025-04-11T18:00:20Z

Add support for 32bit and 64bit SPARC to nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Tested-by: Sebastian Andrzej Siewior # UltraSparc T4 (Niagara4) Link: https://lore.kernel.org/lkml/20250322-nolibc-sparc-v2-1-89af018c6296@weissschuh.net/

tools/nolibc: add support for 32-bit s390

2025-02-20T21:06:32Z

32-bit s390 is very close to the existing 64-bit implementation. Some special handling is necessary as there is neither LLVM nor QEMU support. Also the kernel itself can not build natively for 32-bit s390, so instead the test program is executed with a 64-bit kernel. Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20250206-nolibc-s390-v2-2-991ad97e3d58@weissschuh.net Signed-off-by: Thomas Weißschuh

tools/nolibc: move MIPS ABI validation into arch-mips.h

2023-12-11T21:38:21Z

When installing nolibc to a sysroot arch.h is not used so its ABI check is bypassed. This makes is possible to compile nolibc with a non O32 ABI which may build but can not run. Move the check into arch-mips.h so it will always be evaluated. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau