From nobody Tue Feb 10 15:01:33 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1696376596; cv=none; d=zohomail.com; s=zohoarc; b=CRLxwjBG/9K5blZMUdAGWycC+L4T6FHRXlx3Zk20BTukGgFT3MkVNIwQHfVwszzcrm/rJBa3wkXTWzYl43StEJ5ObFQZFIXeM/krKkaGmC6oZBNvn8SsRmAYojBGeieARXk2g8T1DekTwdWf+GX7A42I0JOQ4XcJwmxmG241zLw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1696376596; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=0xs6F3bQ3X0JBHAPx4Ith6fLrpCOwQaP480klykNHXU=; b=mQZKnk+DyFXqicLSR2zcDqcGZzw6giBx5q8d2TNK8+LI8X3AZLMJJIBLdvjrgdr5u2xMIrbmFhElG/RLaSKp/0XChbChv8ykjcJjKJPXtQolZafs7AA3EaaSn/gxDrU/ZxFcVVS9SQwg8rifFEUTXEFcjLQj+0PP+oJbQAq8HkU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1696376596318257.25941776743366; Tue, 3 Oct 2023 16:43:16 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qnovy-0004nf-78; Tue, 03 Oct 2023 19:36:10 -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 1qnovq-0004Vj-Aq for qemu-devel@nongnu.org; Tue, 03 Oct 2023 19:36:02 -0400 Received: from mail-io1-xd30.google.com ([2607:f8b0:4864:20::d30]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qnovl-0007U2-EN for qemu-devel@nongnu.org; Tue, 03 Oct 2023 19:35:59 -0400 Received: by mail-io1-xd30.google.com with SMTP id ca18e2360f4ac-79fe8986355so59690739f.2 for ; Tue, 03 Oct 2023 16:35:53 -0700 (PDT) Received: from dune.bsdimp.com (50-253-99-174-static.hfc.comcastbusiness.net. [50.253.99.174]) by smtp.gmail.com with ESMTPSA id w25-20020a6b4a19000000b0079fa1a7cd36sm593596iob.30.2023.10.03.16.35.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Oct 2023 16:35:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20230601.gappssmtp.com; s=20230601; t=1696376152; x=1696980952; 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=0xs6F3bQ3X0JBHAPx4Ith6fLrpCOwQaP480klykNHXU=; b=1jXBHGD/moKy7aVUCLb8K9wscR71p5HJndlfTLDp4jf5AORG6Grqq9ZJfZUtvJe/3g SLnvyw7LDJ2csQVUzqf8cBPrui4sDgTs7akMXyJRFQfRICT+Gh0C342bAX+rI9hTr3r4 jZgVIveKPTZJR8HDXXrH3EabMaOzYWa7VVPSqkPNoP6YYuNHJVdtIXSTMtGf8RDl7QbE ufIp5cCilPf6eZDgYNdyfIF3Z3xYaK/ZK1e7xPZkEbGDLVXh8b2ubHT/Xa4H23QlSOwP reqIPpMiKcS57m5GkfYrHHwbK0CqYVAh3/m3RUUZfxCPiah0f6681nUAz9K4Dmqk9GYV truw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696376152; x=1696980952; 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=0xs6F3bQ3X0JBHAPx4Ith6fLrpCOwQaP480klykNHXU=; b=psTzFHjFsEKhNLwq5xMp/nb6QHB9Mp+n8ShDlvIPW021Lp6ytwfqPC2iif2sTDeJiu RNFKUeg+j7QnEdaE6P6b/kCazwfi2IJ5zsAVuHEfcZc7LNqwpoOaAmw/sw8+KOEwigeE dFhsW3Idgug1XM8zRUcMRdzx0BL305e2b2avX4s4lmvvSkdR0D2tKkG+76CxGz4CCD6d rCTT1ik/GikuQtRsc6ANvuOHZbF74gDxX6e6h44vP8wAgjK7bOum+NUt92iEsZqqPto6 BlW+HmUOOciwpOj0ekt6XdjVfWIF1VZkSuPUyi9gr0OwVG0pXJzDSU/Y2poVul7dP6KL v+7A== X-Gm-Message-State: AOJu0YxfmcseR/EijHX/SD4QeT2wZi8guwjAo9KB/Dw9nj98AKpeeOrg IMsh8Am4S4O6WgJ4fJ0+rVhnv7VfV8TbcdTcfq0miA== X-Google-Smtp-Source: AGHT+IF8WUqyCpk83nfDn3hIHdJ5tPbzsXtgSwyPH/X++I1YLXERXzMqlKkSrChUGOHxIMFHnMIY7w== X-Received: by 2002:a5e:8c15:0:b0:787:1472:3181 with SMTP id n21-20020a5e8c15000000b0078714723181mr1027873ioj.3.1696376152518; Tue, 03 Oct 2023 16:35:52 -0700 (PDT) From: Warner Losh To: qemu-devel@nongnu.org Cc: Thomas Huth , Laurent Vivier , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Wainer dos Santos Moschetta , Beraldo Leal , Warner Losh , Kyle Evans , Stacey Son , Karim Taha Subject: [PULL 50/51] bsd-user: Implement shmat(2) and shmdt(2) Date: Tue, 3 Oct 2023 17:32:14 -0600 Message-ID: <20231003233215.95557-51-imp@bsdimp.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231003233215.95557-1-imp@bsdimp.com> References: <20231003233215.95557-1-imp@bsdimp.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::d30; envelope-from=imp@bsdimp.com; helo=mail-io1-xd30.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @bsdimp-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1696376596637100001 Content-Type: text/plain; charset="utf-8" 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_GUA= RD in target_{shmat,shmdt} ceda5688b650646248f269a992c06b11148c5759 linux-user: Fix shmdt Signed-off-by: Stacey Son Signed-off-by: Karim Taha Message-Id: <20230925182709.4834-23-kariem.taha2.7@gmail.com> --- 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 b82f3eaa253..c512a4e3756 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, a= bi_long cmd, return ret; } =20 +/* shmat(2) */ +static inline abi_long do_bsd_shmat(int shmid, abi_ulong shmaddr, int shmf= lg) +{ + abi_ulong raddr; + abi_long ret; + struct shmid_ds shm_info; + + /* Find out the length of the shared memory segment. */ + ret =3D 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 =3D shmat(shmid, (void *)g2h_untagged(shmaddr), shm= flg); + } else { + abi_ulong mmap_start; + + mmap_start =3D mmap_find_vma(0, shm_info.shm_segsz); + + if (mmap_start =3D=3D -1) { + return -TARGET_ENOMEM; + } + host_raddr =3D shmat(shmid, g2h_untagged(mmap_start), + shmflg | SHM_REMAP); + } + + if (host_raddr =3D=3D (void *)-1) { + return get_errno(-1); + } + raddr =3D 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 =3D 0; i < N_BSD_SHM_REGIONS; i++) { + if (bsd_shm_regions[i].start =3D=3D 0) { + bsd_shm_regions[i].start =3D raddr; + bsd_shm_regions[i].size =3D 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 =3D 0; i < N_BSD_SHM_REGIONS; ++i) { + if (bsd_shm_regions[i].start =3D=3D shmaddr) { + break; + } + } + + if (i =3D=3D N_BSD_SHM_REGIONS) { + return -TARGET_EINVAL; + } + + ret =3D get_errno(shmdt(g2h_untagged(shmaddr))); + if (ret =3D=3D 0) { + abi_ulong size =3D bsd_shm_regions[i].size; + + bsd_shm_regions[i].start =3D 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 0512d41db7c..39e66312da1 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -871,6 +871,14 @@ static abi_long freebsd_syscall(void *cpu_env, int num= , abi_long arg1, ret =3D do_bsd_shmctl(arg1, arg2, arg3); break; =20 + case TARGET_FREEBSD_NR_shmat: /* shmat(2) */ + ret =3D do_bsd_shmat(arg1, arg2, arg3); + break; + + case TARGET_FREEBSD_NR_shmdt: /* shmdt(2) */ + ret =3D do_bsd_shmdt(arg1); + break; + /* * Misc */ diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c index 8e148a2ea3e..3ef11b28079 100644 --- a/bsd-user/mmap.c +++ b/bsd-user/mmap.c @@ -636,7 +636,7 @@ fail: return -1; } =20 -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 6047805ae38..dc842fffa7d 100644 --- a/bsd-user/qemu.h +++ b/bsd-user/qemu.h @@ -233,6 +233,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong ol= d_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); =20 --=20 2.41.0