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torvaldstorvalds
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Merge tag 'nolibc-20250526-for-6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc
Pull nolibc updates from Thomas Weißschuh: - New supported architectures: m68k, SPARC (32 and 64 bit) - Compatibility with kselftest_harness.h - A more robust mechanism to include all of nolibc from each header - Split existing features into new headers to simplify adoption - Compatibility with UBSAN and it is used in the testsuite - Many small new features focussing on usage in kselftests * tag 'nolibc-20250526-for-6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/nolibc/linux-nolibc: (83 commits) selftests: harness: Stop using setjmp()/longjmp() selftests: harness: Add "variant" and "self" to test metadata selftests: harness: Add teardown callback to test metadata selftests: harness: Move teardown conditional into test metadata selftests: harness: Don't set setup_completed for fixtureless tests selftests: harness: Implement test timeouts through pidfd selftests: harness: Remove dependency on libatomic selftests: harness: Remove inline qualifier for wrappers selftests: harness: Mark functions without prototypes static selftests: harness: Ignore unused variant argument warning selftests: harness: Use C89 comment style selftests: harness: Add kselftest harness selftest selftests/nolibc: drop include guards around standard headers tools/nolibc: move NULL and offsetof() to sys/stddef.h tools/nolibc: move uname() and friends to sys/utsname.h tools/nolibc: move makedev() and friends to sys/sysmacros.h tools/nolibc: move getrlimit() and friends to sys/resource.h tools/nolibc: move reboot() to sys/reboot.h tools/nolibc: move prctl() to sys/prctl.h tools/nolibc: move mount() to sys/mount.h ...
2 parents 3e443d1 + 869c788 commit 015a99f

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‎MAINTAINERS

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@@ -21971,6 +21971,7 @@ F: include/linux/seccomp.h
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F: include/uapi/linux/seccomp.h
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F: kernel/seccomp.c
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F: tools/testing/selftests/kselftest_harness.h
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F: tools/testing/selftests/kselftest_harness/
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F: tools/testing/selftests/seccomp/*
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K: \bsecure_computing
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K: \bTIF_SECCOMP\b

‎tools/include/nolibc/Makefile

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@@ -30,18 +30,41 @@ all_files := \
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crt.h \
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ctype.h \
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dirent.h \
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elf.h \
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errno.h \
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fcntl.h \
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getopt.h \
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limits.h \
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math.h \
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nolibc.h \
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poll.h \
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sched.h \
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signal.h \
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stackprotector.h \
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std.h \
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stdarg.h \
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stdbool.h \
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stddef.h \
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stdint.h \
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stdlib.h \
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string.h \
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sys.h \
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sys/auxv.h \
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sys/ioctl.h \
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sys/mman.h \
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sys/mount.h \
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sys/prctl.h \
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sys/random.h \
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sys/reboot.h \
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sys/resource.h \
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sys/stat.h \
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sys/syscall.h \
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sys/sysmacros.h \
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sys/time.h \
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sys/timerfd.h \
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sys/types.h \
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sys/utsname.h \
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sys/wait.h \
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time.h \
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types.h \
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unistd.h \
@@ -72,7 +95,7 @@ help:
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headers:
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$(Q)mkdir -p $(OUTPUT)sysroot
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$(Q)mkdir -p $(OUTPUT)sysroot/include
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$(Q)cp $(all_files) $(OUTPUT)sysroot/include/
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$(Q)cp --parents $(all_files) $(OUTPUT)sysroot/include/
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$(Q)if [ "$(ARCH)" = "x86" ]; then \
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sed -e \
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's,^#ifndef _NOLIBC_ARCH_X86_64_H,#if !defined(_NOLIBC_ARCH_X86_64_H) \&\& defined(__x86_64__),' \
@@ -91,5 +114,14 @@ headers_standalone: headers
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$(Q)$(MAKE) -C $(srctree) headers
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$(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
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# GCC uses "s390", clang "systemz"
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CLANG_CROSS_FLAGS := $(subst --target=s390-linux,--target=systemz-linux,$(CLANG_CROSS_FLAGS))
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headers_check: headers_standalone
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for header in $(filter-out crt.h std.h,$(all_files)); do \
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$(CC) $(CLANG_CROSS_FLAGS) -Wall -Werror -nostdinc -fsyntax-only -x c /dev/null \
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-I$(or $(objtree),$(srctree))/usr/include -include $$header -include $$header || exit 1; \
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done
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clean:
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$(call QUIET_CLEAN, nolibc) rm -rf "$(OUTPUT)sysroot"

‎tools/include/nolibc/arch-aarch64.h

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@@ -146,7 +146,6 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
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{
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__asm__ volatile (
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"mov x0, sp\n" /* save stack pointer to x0, as arg1 of _start_c */
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"and sp, x0, -16\n" /* sp must be 16-byte aligned in the callee */
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"bl _start_c\n" /* transfer to c runtime */
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);
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__nolibc_entrypoint_epilogue();

‎tools/include/nolibc/arch-arm.h

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@@ -189,8 +189,6 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
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{
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__asm__ volatile (
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"mov r0, sp\n" /* save stack pointer to %r0, as arg1 of _start_c */
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"and ip, r0, #-8\n" /* sp must be 8-byte aligned in the callee */
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"mov sp, ip\n"
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"bl _start_c\n" /* transfer to c runtime */
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);
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__nolibc_entrypoint_epilogue();

‎tools/include/nolibc/arch-i386.h

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@@ -167,8 +167,6 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
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__asm__ volatile (
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"xor %ebp, %ebp\n" /* zero the stack frame */
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"mov %esp, %eax\n" /* save stack pointer to %eax, as arg1 of _start_c */
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"add $12, %esp\n" /* avoid over-estimating after the 'and' & 'sub' below */
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"and $-16, %esp\n" /* the %esp must be 16-byte aligned on 'call' */
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"sub $12, %esp\n" /* sub 12 to keep it aligned after the push %eax */
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"push %eax\n" /* push arg1 on stack to support plain stack modes too */
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"call _start_c\n" /* transfer to c runtime */

‎tools/include/nolibc/arch-loongarch.h

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@@ -142,18 +142,11 @@
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_arg1; \
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})
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145-
#if __loongarch_grlen == 32
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#define LONG_BSTRINS "bstrins.w"
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#else /* __loongarch_grlen == 64 */
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#define LONG_BSTRINS "bstrins.d"
149-
#endif
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/* startup code */
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void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
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{
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__asm__ volatile (
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"move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
156-
LONG_BSTRINS " $sp, $zero, 3, 0\n" /* $sp must be 16-byte aligned */
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"bl _start_c\n" /* transfer to c runtime */
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);
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__nolibc_entrypoint_epilogue();

‎tools/include/nolibc/arch-m68k.h

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@@ -0,0 +1,141 @@
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* m68k specific definitions for NOLIBC
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* Copyright (C) 2025 Daniel Palmer<[email protected]>
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*
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* Roughly based on one or more of the other arch files.
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*
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*/
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#ifndef _NOLIBC_ARCH_M68K_H
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#define _NOLIBC_ARCH_M68K_H
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#include "compiler.h"
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#include "crt.h"
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#define _NOLIBC_SYSCALL_CLOBBERLIST "memory"
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#define my_syscall0(num) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall1(num, arg1) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_arg1) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_num; \
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})
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#define my_syscall2(num, arg1, arg2) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
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: "r"(_arg1), "r"(_arg2) \
55+
: _NOLIBC_SYSCALL_CLOBBERLIST \
56+
); \
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_num; \
58+
})
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60+
#define my_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _num __asm__ ("d0") = (num); \
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register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r"(_num) \
70+
: "r"(_arg1), "r"(_arg2), "r"(_arg3) \
71+
: _NOLIBC_SYSCALL_CLOBBERLIST \
72+
); \
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_num; \
74+
})
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76+
#define my_syscall4(num, arg1, arg2, arg3, arg4) \
77+
({ \
78+
register long _num __asm__ ("d0") = (num); \
79+
register long _arg1 __asm__ ("d1") = (long)(arg1); \
80+
register long _arg2 __asm__ ("d2") = (long)(arg2); \
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register long _arg3 __asm__ ("d3") = (long)(arg3); \
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register long _arg4 __asm__ ("d4") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"trap #0\n" \
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: "+r" (_num) \
87+
: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
88+
: _NOLIBC_SYSCALL_CLOBBERLIST \
89+
); \
90+
_num; \
91+
})
92+
93+
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
94+
({ \
95+
register long _num __asm__ ("d0") = (num); \
96+
register long _arg1 __asm__ ("d1") = (long)(arg1); \
97+
register long _arg2 __asm__ ("d2") = (long)(arg2); \
98+
register long _arg3 __asm__ ("d3") = (long)(arg3); \
99+
register long _arg4 __asm__ ("d4") = (long)(arg4); \
100+
register long _arg5 __asm__ ("d5") = (long)(arg5); \
101+
\
102+
__asm__ volatile ( \
103+
"trap #0\n" \
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: "+r" (_num) \
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: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
106+
: _NOLIBC_SYSCALL_CLOBBERLIST \
107+
); \
108+
_num; \
109+
})
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111+
#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
112+
({ \
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register long _num __asm__ ("d0") = (num); \
114+
register long _arg1 __asm__ ("d1") = (long)(arg1); \
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register long _arg2 __asm__ ("d2") = (long)(arg2); \
116+
register long _arg3 __asm__ ("d3") = (long)(arg3); \
117+
register long _arg4 __asm__ ("d4") = (long)(arg4); \
118+
register long _arg5 __asm__ ("d5") = (long)(arg5); \
119+
register long _arg6 __asm__ ("a0") = (long)(arg6); \
120+
\
121+
__asm__ volatile ( \
122+
"trap #0\n" \
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: "+r" (_num) \
124+
: "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
125+
"r"(_arg6) \
126+
: _NOLIBC_SYSCALL_CLOBBERLIST \
127+
); \
128+
_num; \
129+
})
130+
131+
void _start(void);
132+
void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _start(void)
133+
{
134+
__asm__ volatile (
135+
"movel %sp, %sp@-\n"
136+
"jsr _start_c\n"
137+
);
138+
__nolibc_entrypoint_epilogue();
139+
}
140+
141+
#endif /* _NOLIBC_ARCH_M68K_H */

‎tools/include/nolibc/arch-powerpc.h

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@@ -201,15 +201,13 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
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202202
__asm__ volatile (
203203
"mr 3, 1\n" /* save stack pointer to r3, as arg1 of _start_c */
204-
"clrrdi 1, 1, 4\n" /* align the stack to 16 bytes */
205204
"li 0, 0\n" /* zero the frame pointer */
206205
"stdu 1, -32(1)\n" /* the initial stack frame */
207206
"bl _start_c\n" /* transfer to c runtime */
208207
);
209208
#else
210209
__asm__ volatile (
211210
"mr 3, 1\n" /* save stack pointer to r3, as arg1 of _start_c */
212-
"clrrwi 1, 1, 4\n" /* align the stack to 16 bytes */
213211
"li 0, 0\n" /* zero the frame pointer */
214212
"stwu 1, -16(1)\n" /* the initial stack frame */
215213
"bl _start_c\n" /* transfer to c runtime */

‎tools/include/nolibc/arch-riscv.h

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@@ -148,7 +148,6 @@ void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector _s
148148
"lla gp, __global_pointer$\n"
149149
".option pop\n"
150150
"mv a0, sp\n" /* save stack pointer to a0, as arg1 of _start_c */
151-
"andi sp, a0, -16\n" /* sp must be 16-byte aligned */
152151
"call _start_c\n" /* transfer to c runtime */
153152
);
154153
__nolibc_entrypoint_epilogue();

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