From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7ACACC7EE23 for ; Tue, 30 May 2023 15:20:58 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1q419D-0006wq-IO; Tue, 30 May 2023 11:20:31 -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 1q419C-0006we-Lv for qemu-devel@nongnu.org; Tue, 30 May 2023 11:20:30 -0400 Received: from mail-ed1-x52d.google.com ([2a00:1450:4864:20::52d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1q419B-0007yz-4W for qemu-devel@nongnu.org; Tue, 30 May 2023 11:20:30 -0400 Received: by mail-ed1-x52d.google.com with SMTP id 4fb4d7f45d1cf-51492ae66a4so4819049a12.1 for ; Tue, 30 May 2023 08:20:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685460027; x=1688052027; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=GDXilflpx3Ll8uFTtkz22qWsjmWaSnwuzJ17wAGAaBU=; b=O5LMimjyLqjZPdJUupNDjFvZ8rFZ1adzpU0dYObXhLQz3qVU7GoNPjlN0k61w2zgjN 9UIkRDwOk/an84fB1FBlE+SP7fWAA3I9p3AO8UvXwpD/5dH+yk97USDzWwfvu08sdOgt yzXGFOajXbRsdGoVx4bFOY13PV3EnZ9Kf2j5oLWgvj4+rLPbAGXp/TZhIkP73gBg/1vr NtSDLoCYh7h753m+AHFXdi24jFuBHkIIhzRdXJNdxfy3FCQFxUsG79DEHbZz7GDY+wmJ r+ZozsT6joZjSm2+/h5koHgf29X5NvEpn6xXhJbJedQH1UBeadNZJFbU6cnJnaIPgNVc vsTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685460027; x=1688052027; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=GDXilflpx3Ll8uFTtkz22qWsjmWaSnwuzJ17wAGAaBU=; b=H2IwGBdeVt/8sH9Nnanhi6xJ2G0hkAxvzECPADw8WCfElNMy2eTGwife7Vy7Lwdwa7 DO1DbPXQ3GoSj8vX6avx04Gfml+3EDBVB4K5rFzbzcHhSQZCXFs5dKz1OXGsLW4xcPz+ /OHwsqzbWI/m1A0rF9J25u81sHiDOncHwIAn+/7WJYWDAeJO3p1xQ7sn/6a7l1VZbZys iX5yCvJtWVIfS34oFkO0xCKea8o30uy5baiLt0UmRM7a0XgFfgN7yslPiO1ziGDyjUrT DyoGCc5lfvLp/ie7wiMGgDfgip1c7ctV7j/itB6NNP7Ohce1JUCP7llk/Q7/RG0z6jGE zDig== X-Gm-Message-State: AC+VfDx8msMIYUJ5ZJoCv3OMnmCYazCDs/X0c4U8IPuuFN0uzKeQskuX HwYXFkX+OSiqXxPoZK+Z4YOsY/9c6czRFGfhhqdcCjQqIJG+rusK X-Google-Smtp-Source: ACHHUZ47Bc1eUK3Qv0QQdItsrc2lvwRhJKpmdDTxcZSU+1Ibk6f39BFI+crgHlENst1aB3ITFdKdQy8tIIpVuuRpkdk= X-Received: by 2002:a05:6402:b0a:b0:514:98c8:9d7c with SMTP id bm10-20020a0564020b0a00b0051498c89d7cmr1824501edb.4.1685460027509; Tue, 30 May 2023 08:20:27 -0700 (PDT) MIME-Version: 1.0 References: <20230530142430.45834-1-fufuyqqqqqq@gmail.com> In-Reply-To: From: Peter Maydell Date: Tue, 30 May 2023 16:20:16 +0100 Message-ID: Subject: Re: [RFC] Native Library Calls To: Yeqi Fu Cc: alex.bennee@linaro.org, qemu-devel@nongnu.org Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=2a00:1450:4864:20::52d; envelope-from=peter.maydell@linaro.org; helo=mail-ed1-x52d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue, 30 May 2023 at 15:46, Peter Maydell wrote: > > On Tue, 30 May 2023 at 15:26, Yeqi Fu wrote: > > > > This patch introduces a set of feature instructions for native calls > > and provides helpers to translate these instructions to corresponding > > native functions. A shared library is also implemented, where native > > functions are rewritten as feature instructions. At runtime, user > > programs load the shared library, and feature instructions are > > executed when native functions are called. This patch is applicable > > to user programs with architectures x86, x86_64, arm, aarch64, mips, > > and mips64. To build, compile libnative.c into a shared library for > > the user program's architecture and run the > > '../configure --enable-user-native-call && make' command. > > So it's essentially providing a QEMU-specific ABI that > (somewhat similarly to semihosting) allows guest programs > to use particular instructions/instruction patterns to > say "do a memcpy/memset/memcmp" ? > > Is this an ABI that's implemented by anybody else? Ah, I hadn't realised this was an Outreachy project. I'll let Alex work with you on iterating on this... thanks -- PMM