From nobody Tue Feb 10 01:15:09 2026 Received: from smtp-out3.simply.com (smtp-out3.simply.com [94.231.106.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DAE733A6E7; Fri, 16 Jan 2026 15:30:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=94.231.106.210 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768577461; cv=none; b=MaxauZ9uql6A7obtGdTrbQ3S0+0eXNTIchwC5hwWZVFQwC9kUca67228Ug0dUXGwx3vkLXIVB73RVsbaWOp0UrLJKvtEuTkGam7q4sejhimW+xh7V+i4+BF/rxIs4l0L8lNpzc+Jdj5uG4/PFkYn+fKJ8xUbxLmN9FVFWS5sizs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768577461; c=relaxed/simple; bh=IcFthlrYeG+gbqvQankeIfNvmjsw7u81x1q7iHNerrI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ZqbQhpM0TrX3nph+eB9PxkzYurVCagxUcDb42mFNma80kYN6wHR6UTix/YhX0iDsf4+52BybcFVPZtXnEuwdb9BcixSGnD8+BJT39tS2vUvc34pUNVhMJYcfpNyjNt2gNd2YbejoC+c9EH+zeWwKmoWIYQi84monsaIwStIiUZ8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gaisler.com; spf=pass smtp.mailfrom=gaisler.com; dkim=fail (0-bit key) header.d=gaisler.com header.i=@gaisler.com header.b=L/t8fIRh reason="key not found in DNS"; arc=none smtp.client-ip=94.231.106.210 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gaisler.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gaisler.com Authentication-Results: smtp.subspace.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=gaisler.com header.i=@gaisler.com header.b="L/t8fIRh" Received: from localhost (localhost [127.0.0.1]) by smtp.simply.com (Simply.com) with ESMTP id 4dt3hr2rmyz1Ffyx; Fri, 16 Jan 2026 16:30:52 +0100 (CET) Received: from ludwig.got.gaisler.com (h-98-128-223-123.NA.cust.bahnhof.se [98.128.223.123]) by smtp.simply.com (Simply.com) with ESMTPA id 4dt3hr0bSDz1DDTf; Fri, 16 Jan 2026 16:30:52 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gaisler.com; s=simplycom2; t=1768577452; bh=UnM2tQCR8mePF9ZCNVMq6/NyT3NCkF9jVAMSCvcGixI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=L/t8fIRhdcXjLpV8y7LaSBkgpV+Xc0SJS8l7sihF7E+E/qaI1RHdG1uHNKdyrCMgq 4r9XZ1eejyiYajX60hapaqrbP/1B7u3Wpfeu6IvJG+1R9m58P0nD2hpd563+MMLcEI 06xCEGLCGNpsPApLy2oDATkdTbLdr7t0Exo023pLXesXjurRIEnU6idrXwJiCfR5LM IQ+HTLsCrHAJW3BXfuXjs3o/VnCWDFawvcTWtQZH487rFHBF/jkN6q3vUL4ImKlgNK MhCq5SOIX0d+H8cFJOFOeRGqN5VvbuQR+txGl093CBsBtU+yaHOXfjNYjHxHicflRy 71DDSvhMG1oFA== From: Ludwig Rydberg To: davem@davemloft.net, andreas@gaisler.com, brauner@kernel.org, shuah@kernel.org Cc: sparclinux@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, arnd@arndb.de, glaubitz@physik.fu-berlin.de, geert@linux-m68k.org, schuster.simon@siemens-energy.com Subject: [PATCH 3/3] selftests/clone3: Add sys_clone3 wrapper for SPARC Date: Fri, 16 Jan 2026 16:30:51 +0100 Message-Id: <20260116153051.21678-4-ludwig.rydberg@gaisler.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20260116153051.21678-1-ludwig.rydberg@gaisler.com> References: <20260116153051.21678-1-ludwig.rydberg@gaisler.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a sys_clone3 wrapper (based on the INLINE_CLONE_SYSCALL macro in glibc) for SPARC to handle its unique return call convention. The needed handling is described in arch/sparc/kernel/process_{32|64}.c: Parent --> %o0 =3D=3D child's pid, %o1 =3D=3D 0 Child --> %o0 =3D=3D parent's pid, %o1 =3D=3D 1 Signed-off-by: Ludwig Rydberg --- .../selftests/clone3/clone3_selftests.h | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/tools/testing/selftests/clone3/clone3_selftests.h b/tools/test= ing/selftests/clone3/clone3_selftests.h index a0593e8950f0..5fa33294227d 100644 --- a/tools/testing/selftests/clone3/clone3_selftests.h +++ b/tools/testing/selftests/clone3/clone3_selftests.h @@ -33,12 +33,87 @@ struct __clone_args { __aligned_u64 cgroup; }; =20 +#if defined(__sparc__) +#include + +#if defined(__arch64__) +#define __SYSCALL_STRING \ + "mov %[scn], %%g1;" \ + "ta 0x6d;" \ + "bcc,pt %%xcc, 1f;" \ + " nop;" \ + "sub %%g0, %%o0, %%o0;" \ + "1:" + +#define __SYSCALL_CLOBBERS \ + "g1", "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ + "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ + "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \ + "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \ + "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", \ + "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", \ + "cc", "memory" +#else +#define __SYSCALL_STRING \ + "mov %[scn], %%g1;" \ + "ta 0x10;" \ + "bcc 1f;" \ + " nop;" \ + "sub %%g0, %%o0, %%o0;" \ + "1:" + +#define __SYSCALL_CLOBBERS \ + "g1", "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ + "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \ + "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \ + "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \ + "cc", "memory" +#endif + +/* A special wrapper is required to handle the return call convention + * on SPARC and is based on the INLINE_CLONE_SYSCALL macro in glibc. + * + * Parent --> %o0 =3D=3D child's pid, %o1 =3D=3D 0 + * Child --> %o0 =3D=3D parent's pid, %o1 =3D=3D 1 + */ +static inline pid_t sparc_clone3(struct __clone_args *args, size_t size) +{ + long _cl_args =3D (long) (args); + long _size =3D (long) (size); + long _scn =3D __NR_clone3; + + register long o0 __asm__ ("o0") =3D _cl_args; + register long o1 __asm__ ("o1") =3D _size; + + asm volatile (__SYSCALL_STRING + : "=3Dr" (o0), "=3Dr" (o1) + : [scn] "r" (_scn), "0" (o0), "1" (o1) + : __SYSCALL_CLOBBERS); + + if ((unsigned long) (o0) > -4096UL) { + errno =3D -o0; + o0 =3D -1L; + } else { + o0 &=3D (o1 - 1); + } + + return o0; +} + +static pid_t sys_clone3(struct __clone_args *args, size_t size) +{ + fflush(stdout); + fflush(stderr); + return sparc_clone3(args, size); +} +#else static pid_t sys_clone3(struct __clone_args *args, size_t size) { fflush(stdout); fflush(stderr); return syscall(__NR_clone3, args, size); } +#endif =20 static inline void test_clone3_supported(void) { --=20 2.35.3