From patchwork Thu Aug 24 16:42:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella Netto X-Patchwork-Id: 74660 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 3B692385559F for ; Thu, 24 Aug 2023 16:43:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3B692385559F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1692895383; bh=ANnwAyrMIL1Cnpze1SXFh7NAxxGKcYBY5SM3tGKNK5U=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=ku/VS1K54dnMFq7TrriRrIcSybuQwZIt5lqUiieEMuiH5JYB2jbsqy5gZbQF30ucE FcujZ34NSdGE8bFhgiwKbrPbDDuBnqhwYwCNwRydYQdg2bYXEJecN+yJpigVNG04Oq MPgLgUaxZTEFHyu7J2MImF10JayhygoXeQ8QpXLg= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-oi1-x230.google.com (mail-oi1-x230.google.com [IPv6:2607:f8b0:4864:20::230]) by sourceware.org (Postfix) with ESMTPS id 4604F3858401 for ; Thu, 24 Aug 2023 16:42:28 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 4604F3858401 Received: by mail-oi1-x230.google.com with SMTP id 5614622812f47-3a1ebb85f99so31521b6e.2 for ; Thu, 24 Aug 2023 09:42:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692895347; x=1693500147; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=ANnwAyrMIL1Cnpze1SXFh7NAxxGKcYBY5SM3tGKNK5U=; b=T9U+Y2azuVuVKEryBTPhWFl07hiiF+awOClOe+E9GmsQ1Tel8fpK1254fM0HXU0H/X GQ3wxpkZ4+RwmN47UvWnhGMqbMSOfAYvit9W2/Ed2oeqKmwTB7EjU0fXHWcjERdpmLb3 S5otsWkCJx8yrckJfrxvf2vKPFmXxnj4X6bk7n8nz5zviV7osrXl+os2OvkNmFTE0gHY mAFIIbJ32jmwW80SR1U8XfDxw1ZxItcfcXQSR8jyAK4jeAHIYthzEEh29iLvwJYx8dpI bvKQnZ7Y6qMRp6ms/lby6oG3sdyb5tRqfSjFxSSxBxuh7Ezov3NC0pzziSb+trmMkaly glTA== X-Gm-Message-State: AOJu0YxjIc40kCVFAswo0WEDuolVrhXOf1gX3s/oWW99MTUAmUSkh0cQ vMHv3N4BGGQi/ZpZJON0nOt/xMvTt0B2bP0aR6/fNg== X-Google-Smtp-Source: AGHT+IFfi78/XgYMdQn0W9SHKSrhz65gd6WwMC87TPaEhrndeGVSbGRc+GWVgLKP8OuJkfehv28dLA== X-Received: by 2002:a05:6808:150c:b0:3a7:46d2:5203 with SMTP id u12-20020a056808150c00b003a746d25203mr284764oiw.51.1692895346907; Thu, 24 Aug 2023 09:42:26 -0700 (PDT) Received: from mandiga.. ([2804:1b3:a7c2:c275:5154:75ba:e0b6:f70d]) by smtp.gmail.com with ESMTPSA id r25-20020a544899000000b003a37372e6b2sm5115409oic.21.2023.08.24.09.42.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Aug 2023 09:42:26 -0700 (PDT) To: libc-alpha@sourceware.org, Florian Weimer Subject: [PATCH v9 2/6] mips: Add the clone3 wrapper Date: Thu, 24 Aug 2023 13:42:15 -0300 Message-Id: <20230824164219.391263-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230824164219.391263-1-adhemerval.zanella@linaro.org> References: <20230824164219.391263-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Adhemerval Zanella via Libc-alpha From: Adhemerval Zanella Netto Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); Checked on mips64el-linux-gnueabihf, mips64el-n32-linux-gnu, and mipsel-linux-gnu. --- sysdeps/unix/sysv/linux/mips/clone3.S | 139 ++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/mips/sysdep.h | 2 + 2 files changed, 141 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/mips/clone3.S diff --git a/sysdeps/unix/sysv/linux/mips/clone3.S b/sysdeps/unix/sysv/linux/mips/clone3.S new file mode 100644 index 0000000000..1d16bfcef6 --- /dev/null +++ b/sysdeps/unix/sysv/linux/mips/clone3.S @@ -0,0 +1,139 @@ +/* The clone3 syscall wrapper. Linux/mips 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 +#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: + a0/$4: cl_args + a1/$5: size + a2/$6: func + a3/$7: arg */ + + .text + .set nomips16 +#if _MIPS_SIM == _ABIO32 +# define EXTRA_LOCALS 1 +#else +# define EXTRA_LOCALS 0 +#endif +#define FRAMESZ ((NARGSAVE*SZREG)+ALSZ)&ALMASK +GPOFF= FRAMESZ-(1*SZREG) +NESTED(__clone3, SZREG, sp) +#ifdef __PIC__ + SETUP_GP +#endif +#if FRAMESZ + PTR_SUBU sp, FRAMESZ + cfi_adjust_cfa_offset (FRAMESZ) +#endif + SETUP_GP64_STACK (GPOFF, __clone3) +#ifdef __PIC__ + SAVE_GP (GPOFF) +#endif +#ifdef PROF + .set noat + move $1,ra + jal _mcount + .set at +#endif + + /* Sanity check args. */ + li v0, EINVAL + beqz a0, L(error) /* No NULL cl_args pointer. */ + beqz a2, L(error) /* No NULL function pointer. */ + + move $8, a3 /* a3 is set to 0/1 for syscall success/error + while a4/$8 is returned unmodified. */ + + /* Do the system call, the kernel expects: + v0: system call number + a0: cl_args + a1: size */ + li v0, __NR_clone3 + cfi_endproc + syscall + + bnez a3, L(error) + beqz v0, L(thread_start_clone3) + + /* Successful return from the parent */ + cfi_startproc +#if FRAMESZ + cfi_adjust_cfa_offset (FRAMESZ) +#endif + SETUP_GP64_STACK_CFI (GPOFF) + cfi_remember_state + RESTORE_GP64_STACK +#if FRAMESZ + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) +#endif + ret + +L(error): + cfi_restore_state +#ifdef __PIC__ + PTR_LA t9, __syscall_error + RESTORE_GP64_STACK + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) + jr t9 +#else + RESTORE_GP64_STACK + PTR_ADDU sp, FRAMESZ + cfi_adjust_cfa_offset (-FRAMESZ) + j __syscall_error +#endif +END (__clone3) + +/* Load up the arguments to the function. Put this block of code in + its own function so that we can terminate the stack trace with our + debug info. */ + +ENTRY(__thread_start_clone3) +L(thread_start_clone3): + cfi_undefined ($31) + /* cp is already loaded. */ + SAVE_GP (GPOFF) + /* The stackframe has been created on entry of clone3. */ + + /* Restore the arg for user's function. */ + move t9, a2 /* Function pointer. */ + move a0, $8 /* Argument pointer. */ + + /* Call the user's function. */ + jal t9 + + move a0, v0 + li v0, __NR_exit + syscall +END(__thread_start_clone3) + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/mips/sysdep.h b/sysdeps/unix/sysv/linux/mips/sysdep.h index ff84a91b31..673aa08b57 100644 --- a/sysdeps/unix/sysv/linux/mips/sysdep.h +++ b/sysdeps/unix/sysv/linux/mips/sysdep.h @@ -28,3 +28,5 @@ #endif #define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday" #define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres" + +#define HAVE_CLONE3_WRAPPER 1