From patchwork Mon Sep 25 18:24:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Karim Taha X-Patchwork-Id: 1839240 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=TIiuZnYt; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RvWZP4g8xz1yp8 for ; Tue, 26 Sep 2023 04:27:41 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qkqHy-0001RR-Hz; Mon, 25 Sep 2023 14:26:34 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qkqHt-0001OR-MI for qemu-devel@nongnu.org; Mon, 25 Sep 2023 14:26:31 -0400 Received: from mail-wm1-x331.google.com ([2a00:1450:4864:20::331]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qkqHr-0007Sd-S6 for qemu-devel@nongnu.org; Mon, 25 Sep 2023 14:26:29 -0400 Received: by mail-wm1-x331.google.com with SMTP id 5b1f17b1804b1-4053cb57f02so58796915e9.1 for ; Mon, 25 Sep 2023 11:26:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695666386; x=1696271186; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Rpy9YRc98hoKi4x0RvdoeeuQK0Rj8grNwDEdhtMUgjI=; b=TIiuZnYtv/eB/GWP3XVXBT/2Mh32I45MArFaLua0NYlfleNSg4+vXtV2WabxJanVM8 kYrx0o/5Up63xduo7EtHeAFaNNpu/tNFdOlf2NoNSbFuAtruq20AWLeNx5MdDtXb8zAP BZpomQXgPKEZMDguPexK4wultoNKw8sA9aZZfw068zLqqhZ46JojPfa3nqGuMOqjFF8J c9YkLBBa/l1ArA+58VIW1gye6DBA4aFpr527kzjxEQZRaKiaSjPA12p0xcvv7WgFHz91 sHzRwbfIyFbFR40O5gL13RzsDDw4iwgI+7a0J8eLimN2+gAYZtbkess0Bv9L1Jhva960 HE3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695666386; x=1696271186; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Rpy9YRc98hoKi4x0RvdoeeuQK0Rj8grNwDEdhtMUgjI=; b=rk0I0w5HjSstJpHsRBsSzEd7DpceyU8GxkwvnkLv10z/7OqpxDfwU8lj4LlXMd7qDC ObNa+0K9LdCyhPQvPW/1JjJWJifytF0YIDVVoCCP22+E0MQAgRICAH3lr7wQMZtRL/Ju 4JShOH42FmwGyQAM1q1ly02umUY5sk9lYTB+Vca9TLzNiqXPoZgRdr++6t+Uaf+PB9um AKTJ2GIBt0nYYhBVSpP2M8lYiFagzfh3O415oxt8drY7jU25Us+zoflQKDqaXJRbli9i n2nbmlhrGJcqURoDXof/jNZOPbCp2JO7yC+x9p9V9pNLJfxIB6ZctPZZ40rRhKQBt6QZ gqXQ== X-Gm-Message-State: AOJu0YzChQw/51QE342itMejNXhHzO9CjljS4OH8eYg6J+b3R8v72Xk8 Y98jEfu4z/5zGVzM1B8nC2gohyg3h10= X-Google-Smtp-Source: AGHT+IF1YcMQfeuq6FHDnIqi0tZ96rV5f1wue2Ta3aNCZMP3N9X+Fh7FkazXiz17oao/KyB4+zdUkA== X-Received: by 2002:a7b:c456:0:b0:405:39b4:3145 with SMTP id l22-20020a7bc456000000b0040539b43145mr6859079wmi.2.1695666386257; Mon, 25 Sep 2023 11:26:26 -0700 (PDT) Received: from karim.my.domain ([197.39.209.18]) by smtp.gmail.com with ESMTPSA id 19-20020a05600c229300b00405953973c3sm2232858wmf.6.2023.09.25.11.26.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Sep 2023 11:26:25 -0700 (PDT) From: Karim Taha To: qemu-devel@nongnu.org Cc: Warner Losh , Richard Henderson , Stacey Son , Karim Taha Subject: [PATCH v5 27/28] bsd-user: Implement rfork(2) system call. Date: Mon, 25 Sep 2023 21:24:24 +0300 Message-ID: <20230925182425.3163-28-kariem.taha2.7@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230925182425.3163-1-kariem.taha2.7@gmail.com> References: <20230925182425.3163-1-kariem.taha2.7@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=kariem.taha2.7@gmail.com; helo=mail-wm1-x331.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Stacey Son Signed-off-by: Stacey Son Signed-off-by: Karim Taha Reviewed-by: Richard Henderson Reviewed-by: Warner Losh --- bsd-user/freebsd/os-proc.h | 39 +++++++++++++++++++++++++++++++++++ bsd-user/freebsd/os-syscall.c | 4 ++++ 2 files changed, 43 insertions(+) diff --git a/bsd-user/freebsd/os-proc.h b/bsd-user/freebsd/os-proc.h index 7b2e6a9f79..0a3cd0ef57 100644 --- a/bsd-user/freebsd/os-proc.h +++ b/bsd-user/freebsd/os-proc.h @@ -219,4 +219,43 @@ static inline abi_long do_freebsd_vfork(void *cpu_env) return do_freebsd_fork(cpu_env); } +/* rfork(2) */ +static inline abi_long do_freebsd_rfork(void *cpu_env, abi_long flags) +{ + abi_long ret; + abi_ulong child_flag; + + /* + * XXX We need to handle RFMEM here, as well. Neither are safe to execute + * as-is on x86 hosts because they'll split memory but not the stack, + * wreaking havoc on host architectures that use the stack to store the + * return address as both threads try to pop it off. Rejecting RFSPAWN + * entirely for now is ok, the only consumer at the moment is posix_spawn + * and it will fall back to classic vfork(2) if we return EINVAL. + */ + if ((flags & TARGET_RFSPAWN) != 0) { + return -TARGET_EINVAL; + } + fork_start(); + ret = rfork(flags); + if (ret == 0) { + /* child */ + child_flag = 1; + target_cpu_clone_regs(cpu_env, 0); + } else { + /* parent */ + child_flag = 0; + } + + /* + * The fork system call sets a child flag in the second return + * value: 0 for parent process, 1 for child process. + */ + set_second_rval(cpu_env, child_flag); + fork_end(child_flag); + + return ret; + +} + #endif /* BSD_USER_FREEBSD_OS_PROC_H */ diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c index cb9425c9ba..4c4e773d1d 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -234,6 +234,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, ret = do_freebsd_vfork(cpu_env); break; + case TARGET_FREEBSD_NR_rfork: /* rfork(2) */ + ret = do_freebsd_rfork(cpu_env, arg1); + break; + case TARGET_FREEBSD_NR_execve: /* execve(2) */ ret = do_freebsd_execve(arg1, arg2, arg3); break;