From patchwork Fri Feb 3 17:12:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adhemerval Zanella X-Patchwork-Id: 1737167 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; secure) header.d=sourceware.org header.i=@sourceware.org header.a=rsa-sha256 header.s=default header.b=UgCxjNmU; dkim-atps=neutral Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4P7j1B4Kdxz23hd for ; Sat, 4 Feb 2023 04:13:50 +1100 (AEDT) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 85E15385B52A for ; Fri, 3 Feb 2023 17:13:48 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 85E15385B52A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1675444428; bh=ft3dP+E7AeZFHjqEN0x7NHRiQBFFsU+6Dda3hOgFDo0=; 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=UgCxjNmUkZgrM3O7mhuaqf3fRahODkWlqt/kFSQw6d2HH7FEbV4daYpCJ/iq8QgRf 5wsoCl63nMqTqcZVa933yGXDajpV1zIiQo+xyhCgjpoBiR/9//b5+p4o+KaRUogtOo lodKjYkwuHCEFXX77rtNhmP2z2kEbyeGLsDJHOhY= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-ot1-x32a.google.com (mail-ot1-x32a.google.com [IPv6:2607:f8b0:4864:20::32a]) by sourceware.org (Postfix) with ESMTPS id 2108D3858408 for ; Fri, 3 Feb 2023 17:12:52 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 2108D3858408 Received: by mail-ot1-x32a.google.com with SMTP id 14-20020a9d010e000000b0068bdddfa263so1546313otu.2 for ; Fri, 03 Feb 2023 09:12:52 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=ft3dP+E7AeZFHjqEN0x7NHRiQBFFsU+6Dda3hOgFDo0=; b=2ZrricEVDlYjgfkGzkX+sOaRTagu5joa9IZ8JAzpr8Y1VTD16Hcvg71gVpxyLUNQ2q vstglzUI/kYmqcUw8rWEk61RcJZ7YJ90kb2f3p5i3WnBFi2rY46lB7lsordwaTSngY5M lHqvT0//+LFKNL0G//rNiXfeK4UbPWxavDYWJ50Ic2Uuq3JQTtoak2XwozxvFEronK/h V/9tpDFuHIPuSLxA7ojnqee5bYpjb+psfe6rWElEUq64SVU2kKQy86z/dcXp0DpZ4nlB flwAapnGe4r1e8VpLzSvnQuJbt0Nzclndymz2trOPQcZrNW3mhJBF1kdF35VxOd6pLHM AVEg== X-Gm-Message-State: AO0yUKUatmuCnlh/85tpo7Zhcfj2Pri08E72h4JxnOM4J8Df7RCy+c5R OLoFdmFG50iKCpyzJQQm72MK+iU8NtxxuIKrxk4= X-Google-Smtp-Source: AK7set8Wu95HKuk4+y80MWV6lXhzrplvfgm/4Qg3WV8L6ZkMcQILe1l2AjSvhCAe2KXccJY3gBkfMQ== X-Received: by 2002:a9d:6749:0:b0:684:c723:539c with SMTP id w9-20020a9d6749000000b00684c723539cmr5257323otm.35.1675444370752; Fri, 03 Feb 2023 09:12:50 -0800 (PST) Received: from mandiga.. ([2804:1b3:a7c2:1887:38a0:ca4:680a:31ed]) by smtp.gmail.com with ESMTPSA id cp23-20020a056830661700b0068bdd78f763sm1346672otb.29.2023.02.03.09.12.49 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Feb 2023 09:12:49 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH 5/5] mips: Add the clone3 wrapper Date: Fri, 3 Feb 2023 14:12:37 -0300 Message-Id: <20230203171237.1220878-6-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230203171237.1220878-1-adhemerval.zanella@linaro.org> References: <20230203171237.1220878-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 X-Spam-Status: No, score=-12.6 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 Reply-To: Adhemerval Zanella Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.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 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..492d6d8b77 --- /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, __clone) +#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