From patchwork Mon Sep 25 18:27:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Karim Taha X-Patchwork-Id: 1839289 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=mZSTTX0s; 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 4RvWmw6l4gz1yp0 for ; Tue, 26 Sep 2023 04:36:48 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qkqKp-0001vg-Ls; Mon, 25 Sep 2023 14:29:31 -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 1qkqKO-0000Yn-4O for qemu-devel@nongnu.org; Mon, 25 Sep 2023 14:29:09 -0400 Received: from mail-wm1-x333.google.com ([2a00:1450:4864:20::333]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qkqKM-0007rc-7R for qemu-devel@nongnu.org; Mon, 25 Sep 2023 14:29:03 -0400 Received: by mail-wm1-x333.google.com with SMTP id 5b1f17b1804b1-4054f790190so55646365e9.2 for ; Mon, 25 Sep 2023 11:29:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1695666540; x=1696271340; 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=X+b+Iq4r0rMiqNqK4/5l0105lvJqo4v/7LZGFaqF0v8=; b=mZSTTX0s9jm8RRIyc2KR6b3WwaqTJM9wDXj3V9XGEcKdhEhmwj+gtRha8KdAVh6z/h xIM51JNEgoCnsJDb2vOmf3xmi6kmoaRlxQrmiJlqyvQ4fcMqQZMrXS2Q4ab9/O4dDTPl ANu0nCKxJ9CIcOadVkZ+xSuryZ8LA7KGVshJezDdXkCWAdl2ScZuHraqm3QyWdZ/c2X4 5tl4OS6ycN39d0t9cBmRCuCpV4C3Ev/5/0M8muU3phOJD2ktPO6mN00i7Lf9o8jFAptD 9EOCmXBe4to1Wkr0XukNUtD564GuT9faFsRPgW00O+2YYcCTB/9mXec0QkPQtuhJ6/mG nTYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695666540; x=1696271340; 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=X+b+Iq4r0rMiqNqK4/5l0105lvJqo4v/7LZGFaqF0v8=; b=b50DW4agXyhAPIPwOpC7XKYm0wXp3zgk7rkfj6hfLApTo+ILa2LpguBLcKVlTv1KQi GoxFfyaR96niEG6rKCmhalOJFxoF/ehvpT5E9YmasD2/95jZGbg341rLj5wfN294qRqE B7AImNIp3BR8EMiSADFQ28j2uCnnmuNKQ7F74BKbADVNgtMMs3dKeDAwFNW5GDAK7PdY NFMyoxl3rnfEn8LCPv+o0gbTpvH7LE7vsi0w7IrQ9+fxpX/goAg9qwopd7wwk1v4Zynr +hAsUdAHbiY05BkpenLHgQXfSISjn7Xfz3wd/dKgDgRKhg6NJe7OCRL9knL542mT/Kxv G7Sw== X-Gm-Message-State: AOJu0YxwYMKnAjOUGIvFVaT2UdA6m2WK8BRtVO9C6cTnFu6SWa6Pf3xx 1JVIQpUB4YvVg0glnkSO6LDA3cVpoFw= X-Google-Smtp-Source: AGHT+IHALENbPHAYxE01EAOkDihWg+iR71uDQMAh1E108B4jfC4xM7a1lAF3aDm49xO5oRYSypB1CA== X-Received: by 2002:a5d:4c85:0:b0:321:5d87:5f7c with SMTP id z5-20020a5d4c85000000b003215d875f7cmr7005807wrs.30.1695666540199; Mon, 25 Sep 2023 11:29:00 -0700 (PDT) Received: from karim.my.domain ([197.39.209.18]) by smtp.gmail.com with ESMTPSA id u21-20020adfa195000000b00323293bd023sm3412320wru.6.2023.09.25.11.28.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Sep 2023 11:28:59 -0700 (PDT) From: Karim Taha To: qemu-devel@nongnu.org Cc: Warner Losh , Richard Henderson , Stacey Son , Karim Taha Subject: [PATCH v6 22/23] bsd-user: Implement shmat(2) and shmdt(2) Date: Mon, 25 Sep 2023 21:27:08 +0300 Message-ID: <20230925182709.4834-23-kariem.taha2.7@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230925182709.4834-1-kariem.taha2.7@gmail.com> References: <20230925182709.4834-1-kariem.taha2.7@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=kariem.taha2.7@gmail.com; helo=mail-wm1-x333.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 Use `WITH_MMAP_LOCK_GUARD` instead of mmap_lock() and mmap_unlock(), to match linux-user implementation, according to the following commits: 69fa2708a216df715ba5102a0f98468b540a464e linux-user: Use WITH_MMAP_LOCK_GUARD in target_{shmat,shmdt} ceda5688b650646248f269a992c06b11148c5759 linux-user: Fix shmdt Signed-off-by: Stacey Son Signed-off-by: Karim Taha --- bsd-user/bsd-mem.h | 87 +++++++++++++++++++++++++++++++++++ bsd-user/freebsd/os-syscall.c | 8 ++++ bsd-user/mmap.c | 2 +- bsd-user/qemu.h | 1 + 4 files changed, 97 insertions(+), 1 deletion(-) diff --git a/bsd-user/bsd-mem.h b/bsd-user/bsd-mem.h index b82f3eaa25..c512a4e375 100644 --- a/bsd-user/bsd-mem.h +++ b/bsd-user/bsd-mem.h @@ -344,4 +344,91 @@ static inline abi_long do_bsd_shmctl(abi_long shmid, abi_long cmd, return ret; } +/* shmat(2) */ +static inline abi_long do_bsd_shmat(int shmid, abi_ulong shmaddr, int shmflg) +{ + abi_ulong raddr; + abi_long ret; + struct shmid_ds shm_info; + + /* Find out the length of the shared memory segment. */ + ret = get_errno(shmctl(shmid, IPC_STAT, &shm_info)); + if (is_error(ret)) { + /* Can't get the length */ + return ret; + } + + if (!guest_range_valid_untagged(shmaddr, shm_info.shm_segsz)) { + return -TARGET_EINVAL; + } + + WITH_MMAP_LOCK_GUARD() { + void *host_raddr; + + if (shmaddr) { + host_raddr = shmat(shmid, (void *)g2h_untagged(shmaddr), shmflg); + } else { + abi_ulong mmap_start; + + mmap_start = mmap_find_vma(0, shm_info.shm_segsz); + + if (mmap_start == -1) { + return -TARGET_ENOMEM; + } + host_raddr = shmat(shmid, g2h_untagged(mmap_start), + shmflg | SHM_REMAP); + } + + if (host_raddr == (void *)-1) { + return get_errno(-1); + } + raddr = h2g(host_raddr); + + page_set_flags(raddr, raddr + shm_info.shm_segsz - 1, + PAGE_VALID | PAGE_RESET | PAGE_READ | + (shmflg & SHM_RDONLY ? 0 : PAGE_WRITE)); + + for (int i = 0; i < N_BSD_SHM_REGIONS; i++) { + if (bsd_shm_regions[i].start == 0) { + bsd_shm_regions[i].start = raddr; + bsd_shm_regions[i].size = shm_info.shm_segsz; + break; + } + } + } + + return raddr; +} + +/* shmdt(2) */ +static inline abi_long do_bsd_shmdt(abi_ulong shmaddr) +{ + abi_long ret; + + WITH_MMAP_LOCK_GUARD() { + int i; + + for (i = 0; i < N_BSD_SHM_REGIONS; ++i) { + if (bsd_shm_regions[i].start == shmaddr) { + break; + } + } + + if (i == N_BSD_SHM_REGIONS) { + return -TARGET_EINVAL; + } + + ret = get_errno(shmdt(g2h_untagged(shmaddr))); + if (ret == 0) { + abi_ulong size = bsd_shm_regions[i].size; + + bsd_shm_regions[i].start = 0; + page_set_flags(shmaddr, shmaddr + size - 1, 0); + mmap_reserve(shmaddr, size); + } + } + + return ret; +} + #endif /* BSD_USER_BSD_MEM_H */ diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c index 664b8de104..6b32d4df68 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -667,6 +667,14 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1, ret = do_bsd_shmctl(arg1, arg2, arg3); break; + case TARGET_FREEBSD_NR_shmat: /* shmat(2) */ + ret = do_bsd_shmat(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_shmdt: /* shmdt(2) */ + ret = do_bsd_shmdt(arg1); + break; + /* * Misc */ diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index 8e148a2ea3..3ef11b2807 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -636,7 +636,7 @@ fail: return -1; } -static void mmap_reserve(abi_ulong start, abi_ulong size) +void mmap_reserve(abi_ulong start, abi_ulong size) { abi_ulong real_start; abi_ulong real_end; diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h index d9507137cc..d67dd76827 100644 --- a/bsd-user/qemu.h +++ b/bsd-user/qemu.h @@ -232,6 +232,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size, int target_msync(abi_ulong start, abi_ulong len, int flags); extern abi_ulong mmap_next_start; abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size); +void mmap_reserve(abi_ulong start, abi_ulong size); void TSA_NO_TSA mmap_fork_start(void); void TSA_NO_TSA mmap_fork_end(int child);