From nobody Fri Dec 19 04:29:28 2025 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; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1620650328; cv=none; d=zohomail.com; s=zohoarc; b=RIDRgaWEDdlT+8cIzjKiHB0n+a1wGjFQ4Ww09/PIJowTWZkEVL7jp3YWqn+e1KeugnH48Yu9r/xFes1TdSgi96c50jrMU+fJK2cPJKEFNhM9F79/THZutOd1QzqGwEwDrcuUOsLzwQ0dmMc2I90sipCYzfyQrI2nfSRkwRgrcH8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1620650328; h=Content-Transfer-Encoding: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=JL7HH1O51sX2ceg9tbB6Rc1ZArs66XI/7qZrVHYeGK8=; b=aP+FfI17CgGh5VozdajNIeVMTJnQx+Rm0fVKFLa1tPPWX+QBXz/NvJvLGckrvvEGGdAv5N2i4sJ/7v/gRT4hBuPWNfCq3RD4RZ9WUGBk3KdN+p7bbU2M/m9zkAHM0w0EADKLVikclqsjQJbGZTxqstpsXQk1fdOd7N4Sg2BRp/w= 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; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1620650328970898.485572988102; Mon, 10 May 2021 05:38:48 -0700 (PDT) Received: from localhost ([::1]:53026 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lg5BP-00064T-Ro for importer@patchew.org; Mon, 10 May 2021 08:38:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37622) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lg4z8-000673-Eq for qemu-devel@nongnu.org; Mon, 10 May 2021 08:26:06 -0400 Received: from mail-wr1-x430.google.com ([2a00:1450:4864:20::430]:36655) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lg4z5-0003FH-6c for qemu-devel@nongnu.org; Mon, 10 May 2021 08:26:06 -0400 Received: by mail-wr1-x430.google.com with SMTP id m9so16437496wrx.3 for ; Mon, 10 May 2021 05:26:02 -0700 (PDT) Received: from orth.archaic.org.uk (orth.archaic.org.uk. [81.2.115.148]) by smtp.gmail.com with ESMTPSA id d9sm22749897wrp.47.2021.05.10.05.26.01 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 May 2021 05:26:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=JL7HH1O51sX2ceg9tbB6Rc1ZArs66XI/7qZrVHYeGK8=; b=OXA5Mh3Hm41Dn5xwmqhzHyxWGmDVLG26MccGUbL70LwtX+UhyCG8KZ6uCeLRDA+cK4 FEaXBKvIGfE0lI7X3+GsOPoKewjX//Oh6F5s9Xw3+dX9u4AzxsCNgMuxlgqSUzJYl2+E rN2vkrL/PCz9mQSmmzboYOD/+lMQLPXbwDNeY3tAtusT6Tkbno0sfCtDBggelXAtyQvE M4YIJa/UBknLDAw8VAf67Kmj7/U/36CQJXLyqMs1KObk2FVMgCxR1JG1uQEn33YFPY3l AZdZqbAI9WsAiVBX9xvZpVSLeopsOPzx9ON/sPurJn6tlWbWCCuLH5P1u+xk/yoznYCr jzYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=JL7HH1O51sX2ceg9tbB6Rc1ZArs66XI/7qZrVHYeGK8=; b=Ubz2OfBlS81ExCM5IrpSFnruUClc26vIK/8TIG6OxQ9yNU7z+S5Eh+nzNPbmBjTd7d qkMKMwp5PFvfSrw7NXEjy9nGZ8IdryI+mmoAlOj63L53rDOtAGu6RlMST7iVsR952SmK u5j8mXceA5UrqjbKW6a2LXozJ3qVQhQLcwOhagU8TGeruN1LAqaKN0NDc6NSR5bTWXyb neUFyq83ERHATsavfV+2P43demkng3u4v3SzWdZXWA/Q6w6Cpeeipk6/C1b8FWvcvxBm ihM9SMC8tRrnWY1b8QBk5gan7zn7UDDrtyrsbSuIBwGgL6S+PXT/9OrE6K+JZtsXUBIG AzLg== X-Gm-Message-State: AOAM530cwteT7ViB8hpiM7q0i7oemsD/ps2fQhtxgA62SPp2E2CHqMTD /50e2AT040lOb5qc0hLmo7qlOULH/PWL5g== X-Google-Smtp-Source: ABdhPJxqcbzFp1SnPvSixiG0euIL46p1skYILZWpRicpwRFS+09qvz61N2GWFFzgxBHoIgcSVI+Cew== X-Received: by 2002:a05:6000:108f:: with SMTP id y15mr31362080wrw.115.1620649561878; Mon, 10 May 2021 05:26:01 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 17/26] target/arm: Make WFI a NOP for userspace emulators Date: Mon, 10 May 2021 13:25:39 +0100 Message-Id: <20210510122548.28638-18-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210510122548.28638-1-peter.maydell@linaro.org> References: <20210510122548.28638-1-peter.maydell@linaro.org> 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: pass client-ip=2a00:1450:4864:20::430; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x430.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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 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" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" The WFI insn is not system-mode only, though it doesn't usually make a huge amount of sense for userspace code to execute it. Currently if you try it in qemu-arm then the helper function will raise an EXCP_HLT exception, which is not covered by the switch in cpu_loop() and results in an abort: qemu: unhandled CPU exception 0x10001 - aborting R00=3D00000001 R01=3D408003e4 R02=3D408003ec R03=3D000102ec R04=3D00010a28 R05=3D00010158 R06=3D00087460 R07=3D00010158 R08=3D00000000 R09=3D00000000 R10=3D00085b7c R11=3D408002a4 R12=3D408002b8 R13=3D408002a0 R14=3D0001057c R15=3D000102f8 PSR=3D60000010 -ZC- A usr32 qemu:handle_cpu_signal received signal outside vCPU context @ pc=3D0x7fcbfa= 4f0a12 Make the WFI helper function return immediately in the usermode emulator. This turns WFI into a NOP, which is OK because: * architecturally "WFI is a NOP" is a permitted implementation * aarch64 Linux kernels use the SCTLR_EL1.nTWI bit to trap userspace WFI and NOP it (though aarch32 kernels currently just let WFI do whatever it would do) We could in theory make the translate.c code special case user-mode emulation and NOP the insn entirely rather than making the helper do nothing, but because no real world code will be trying to execute WFI we don't care about efficiency and the helper provides a single place where we can make the change rather than having to touch multiple places in translate.c and translate-a64.c. Fixes: https://bugs.launchpad.net/qemu/+bug/1926759 Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-id: 20210430162212.825-1-peter.maydell@linaro.org --- target/arm/op_helper.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c index 78b831f1811..381f7857efb 100644 --- a/target/arm/op_helper.c +++ b/target/arm/op_helper.c @@ -285,6 +285,17 @@ static inline int check_wfx_trap(CPUARMState *env, boo= l is_wfe) =20 void HELPER(wfi)(CPUARMState *env, uint32_t insn_len) { +#ifdef CONFIG_USER_ONLY + /* + * WFI in the user-mode emulator is technically permitted but not + * something any real-world code would do. AArch64 Linux kernels + * trap it via SCTRL_EL1.nTWI and make it an (expensive) NOP; + * AArch32 kernels don't trap it so it will delay a bit. + * For QEMU, make it NOP here, because trying to raise EXCP_HLT + * would trigger an abort. + */ + return; +#else CPUState *cs =3D env_cpu(env); int target_el =3D check_wfx_trap(env, false); =20 @@ -309,6 +320,7 @@ void HELPER(wfi)(CPUARMState *env, uint32_t insn_len) cs->exception_index =3D EXCP_HLT; cs->halted =3D 1; cpu_loop_exit(cs); +#endif } =20 void HELPER(wfe)(CPUARMState *env) --=20 2.20.1