From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id AC64D3858C27; Wed, 1 Feb 2023 12:20:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AC64D3858C27 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1675254017; bh=diJCjZORbjPky0hMXxsYLZO/YuPSNdzs/4bEmSMh9Es=; h=From:To:Subject:Date:From; b=M+GobOp4R8Q7fmNXPXp7r1zTM9RPvOw4x+X3QgThozV01sCHzWoFG0O2bZFqRQloE ouoCztVD+p92jreZBOTLyLqVEQ6C4LYPyzG53J71wIcYhPKqHbCKUxJd/YVuXVD0mm aPyDOcXhSjMEeGSL3mWbUD1GAM1FncCkpMyofEJY= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc] aarch64: Add the clone3 wrapper X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella Netto X-Git-Refname: refs/heads/master X-Git-Oldrev: 2053c11331991818882f7cf023ed2ce4ff44b274 X-Git-Newrev: 1e442efd57f231bf76030d7a30f2095d1261db20 Message-Id: <20230201122017.AC64D3858C27@sourceware.org> Date: Wed, 1 Feb 2023 12:20:17 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1e442efd57f231bf76030d7a30f2095d1261db20 commit 1e442efd57f231bf76030d7a30f2095d1261db20 Author: Adhemerval Zanella Netto Date: Thu Jan 12 10:58:52 2023 -0300 aarch64: Add the clone3 wrapper It follow the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on aarch64-linux-gnu. Reviewed-by: Carlos O'Donell Diff: --- sysdeps/unix/sysv/linux/aarch64/clone3.S | 85 ++++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/aarch64/sysdep.h | 2 + 2 files changed, 87 insertions(+) diff --git a/sysdeps/unix/sysv/linux/aarch64/clone3.S b/sysdeps/unix/sysv/linux/aarch64/clone3.S new file mode 100644 index 0000000000..88a1fa1e89 --- /dev/null +++ b/sysdeps/unix/sysv/linux/aarch64/clone3.S @@ -0,0 +1,85 @@ +/* The clone3 syscall wrapper. Linux/aarch64 version. + Copyright (C) 2023 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#define _ERRNO_H 1 +#include + +/* The userland implementation is: + int clone3 (struct clone_args *cl_args, size_t size, + int (*func)(void *arg), void *arg); + + the kernel entry is: + int clone3 (struct clone_args *cl_args, size_t size); + + The parameters are passed in registers from userland: + x0: cl_args + x1: size + x2: func + x3: arg */ + + .text +ENTRY(__clone3) + PTR_ARG (0) + PTR_ARG (1) + PTR_ARG (3) + PTR_ARG (4) + /* Save args for the child. */ + mov x10, x0 /* cl_args */ + mov x11, x2 /* func */ + mov x12, x3 /* args */ + + /* Sanity check args. */ + mov x0, #-EINVAL + cbz x10, .Lsyscall_error /* No NULL cl_args pointer. */ + cbz x2, .Lsyscall_error /* No NULL function pointer. */ + + /* Do the system call, the kernel expects: + x8: system call number + x0: cl_args + x1: size */ + mov x0, x10 + mov x8, #SYS_ify(clone3) + svc 0x0 + + cmp x0, #0 + beq thread_start + blt .Lsyscall_error + RET +PSEUDO_END (__clone3) + + .align 4 + .type thread_start, %function +thread_start: + cfi_startproc + cfi_undefined (x30) + mov x29, 0 + + /* Pick the function arg and execute. */ + mov x0, x12 + blr x11 + + /* We are done, pass the return value through x0. */ + mov x8, #SYS_ify(exit) + svc 0x0 + cfi_endproc + .size thread_start, .-thread_start + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/aarch64/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/sysdep.h index 6520fa15da..e94d1703ad 100644 --- a/sysdeps/unix/sysv/linux/aarch64/sysdep.h +++ b/sysdeps/unix/sysv/linux/aarch64/sysdep.h @@ -165,6 +165,8 @@ # define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime" # define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday" +# define HAVE_CLONE3_WRAPPER 1 + # undef INTERNAL_SYSCALL_RAW # define INTERNAL_SYSCALL_RAW(name, nr, args...) \ ({ long _sys_result; \