From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id 4D8213858C2C; Tue, 29 Nov 2022 21:21:36 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4D8213858C2C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1669756896; bh=LtduIfB5YxgCpmXFbWuQXadx55i8WSOfqjFhFE9PorI=; h=From:To:Subject:Date:From; b=E8pkFvJwEm9zbXyPQfQa4t+JR74wr1AeQxlpT1IV39Py1Sl2ygf0F7niyZbn2hIjt 2e1eqWArOSaqs0Lb/wKJLlZd9ycovPjBt4FB3dqwaWX6dKGqzdPqlHYQ6Yv7/hoHOZ c6b0k22uz7iLWaaM9ARVFW5fgML7Hlq9OIHI/bx4= 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/azanella/posix_spawn-clone3] arm: Add the clone3 wrapper X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/azanella/posix_spawn-clone3 X-Git-Oldrev: 6f7272c3b6bee63c25e3ad891de20a1b8ded6627 X-Git-Newrev: 50bf08e5e012046c343c8f6cdf1734f9c164f362 Message-Id: <20221129212136.4D8213858C2C@sourceware.org> Date: Tue, 29 Nov 2022 21:21:36 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=50bf08e5e012046c343c8f6cdf1734f9c164f362 commit 50bf08e5e012046c343c8f6cdf1734f9c164f362 Author: Adhemerval Zanella Date: Fri Sep 30 09:17:34 2022 -0300 arm: Add the clone3 wrapper It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on arm-linux-gnueabihf. Diff: --- sysdeps/unix/sysv/linux/arm/clone3.S | 80 ++++++++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/arm/sysdep.h | 1 + 2 files changed, 81 insertions(+) diff --git a/sysdeps/unix/sysv/linux/arm/clone3.S b/sysdeps/unix/sysv/linux/arm/clone3.S new file mode 100644 index 0000000000..d5949fae77 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arm/clone3.S @@ -0,0 +1,80 @@ +/* The clone3 syscall wrapper. Linux/arm version. + Copyright (C) 2022 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: + r0: cl_args + r1: size + r2: func + r3: arg */ + + .text +ENTRY(__clone3) + /* Sanity check args. */ + cmp r0, #0 + ite ne + cmpne r1, #0 + moveq r0, #-EINVAL + beq PLTJMP(syscall_error) + + /* Do the syscall, the kernel expects: + r7: system call number: + r0: cl_args + r1: size */ + push { r7 } + cfi_adjust_cfa_offset (4) + cfi_rel_offset (r7, 0) + ldr r7, =SYS_ify(clone3) + swi 0x0 + cfi_endproc + + cmp r0, #0 + beq 1f + pop {r7} + blt PLTJMP(C_SYMBOL_NAME(__syscall_error)) + RETINSTR(, lr) + + cfi_startproc +PSEUDO_END (__clone3) + +1: + .fnstart + .cantunwind + mov r0, r3 + mov ip, r2 + BLX (ip) + + /* And we are done, passing the return value through r0. */ + ldr r7, =SYS_ify(exit) + swi 0x0 + + .fnend + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/arm/sysdep.h b/sysdeps/unix/sysv/linux/arm/sysdep.h index 1f270b961e..fcc86189d6 100644 --- a/sysdeps/unix/sysv/linux/arm/sysdep.h +++ b/sysdeps/unix/sysv/linux/arm/sysdep.h @@ -362,6 +362,7 @@ __local_syscall_error: \ #define HAVE_CLOCK_GETTIME_VSYSCALL "__vdso_clock_gettime" #define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime64" #define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday" +#define HAVE_CLONE3_WRAPPER 1 #define LOAD_ARGS_0() #define ASM_ARGS_0