From patchwork Thu Aug 3 16:35:52 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: 1816580 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=2620:52:3:1:0:246e:9693:128c; helo=server2.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=R02LQsU4; dkim-atps=neutral Received: from server2.sourceware.org (server2.sourceware.org [IPv6:2620:52:3:1:0:246e:9693:128c]) (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 4RGvcn1Dq9z1ybS for ; Fri, 4 Aug 2023 02:36:41 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 260243858035 for ; Thu, 3 Aug 2023 16:36:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 260243858035 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1691080599; 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=R02LQsU4lDiA8bPzA9LG3r2C2d/PvxBP+u34F8TDZnGHGY9povIWgsW8ldTjlGT96 E9SB4AJrIgvQ1FCmqudu74DwQIU9KeJOATzaZuZnQ7WFOXxguIcJgmvbk8FCDLYgXE LRIgrtURue0phYzYZcow7sKNq4kicOyqHuLU5XS8= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-ot1-x32f.google.com (mail-ot1-x32f.google.com [IPv6:2607:f8b0:4864:20::32f]) by sourceware.org (Postfix) with ESMTPS id 234653858C27 for ; Thu, 3 Aug 2023 16:36:08 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 234653858C27 Received: by mail-ot1-x32f.google.com with SMTP id 46e09a7af769-6bcc5c86b20so1077994a34.3 for ; Thu, 03 Aug 2023 09:36:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691080567; x=1691685367; 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=I973Omy9xb5q2VL6h11crvQQhHNNo+EBeVLW1wsMomZdwRIT2LO2V1Bq5BRmrgBuQr 295L8PmuIiNTE5wzGLIf7IgiLXMZW9JTUPn+xdy6JUpFWl87uGwyZS5GsLm/t+kM3xfx rpSSe6RE23vSAeCfKZqswRjLxhrxdmQxG8WzQHXITeQ7qZFHPhSfQoErdY9rwfpZ7FxJ XA3avOBiL1a9Ge+5Vjxo35LDeShpCQHoHSt9ZwR2QRnxZTp29YysjQ5ecm+yZ1sHlrPa DUyjFG24ilYOribr5kQVIfBE0O+eEDwusU/aFacAVFCAweuW+JDzb7ecGy3NYTg36wzl KUUA== X-Gm-Message-State: ABy/qLZYRb+NEjrj/8UMqPVqRB1H6ZQIkxy0wJUjIbHfyS3VnAEBeYtF HHwkOYpgP2R5v4jUG2rUedoOE4CRM2Ijxe9VlAyrxA== X-Google-Smtp-Source: APBJJlFqYoA7Tk4frhoJzLQkadaDolhkq0h5LqMG/5N+JvSmmO39hTUk0D1ohhw+3P5S/EdsGBLsWA== X-Received: by 2002:a05:6830:195:b0:6b9:580f:8e47 with SMTP id q21-20020a056830019500b006b9580f8e47mr22474416ota.21.1691080566789; Thu, 03 Aug 2023 09:36:06 -0700 (PDT) Received: from mandiga.. ([2804:1b3:a7c1:9aa9:6a6b:da4a:374c:385a]) by smtp.gmail.com with ESMTPSA id t12-20020a0568301e2c00b006b9a9bc7773sm148694otr.56.2023.08.03.09.36.05 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Aug 2023 09:36:05 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v7 2/8] mips: Add the clone3 wrapper Date: Thu, 3 Aug 2023 13:35:52 -0300 Message-Id: <20230803163558.991832-3-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230803163558.991832-1-adhemerval.zanella@linaro.org> References: <20230803163558.991832-1-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, T_SCC_BODY_TEXT_LINE 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+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, 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