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 1F74CCD3431 for ; Wed, 4 Sep 2024 10:32:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1slnIV-0003t4-Hh; Wed, 04 Sep 2024 06:31:35 -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 1slnIT-0003sR-QP for qemu-devel@nongnu.org; Wed, 04 Sep 2024 06:31:33 -0400 Received: from dedi548.your-server.de ([85.10.215.148]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1slnIR-0002Ch-Sj for qemu-devel@nongnu.org; Wed, 04 Sep 2024 06:31:33 -0400 Received: from sslproxy05.your-server.de ([78.46.172.2]) by dedi548.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1slmzS-0001Jx-2h for qemu-devel@nongnu.org; Wed, 04 Sep 2024 12:11:55 +0200 Received: from [82.100.198.138] (helo=mail.embedded-brains.de) by sslproxy05.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1slmzT-000B56-1x for qemu-devel@nongnu.org; Wed, 04 Sep 2024 12:11:54 +0200 Received: from localhost (localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id 735234800A3 for ; Wed, 4 Sep 2024 12:11:54 +0200 (CEST) Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavis, port 10032) with ESMTP id pxS_DPTZL5yF for ; Wed, 4 Sep 2024 12:11:54 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id 228FD48017F for ; Wed, 4 Sep 2024 12:11:54 +0200 (CEST) X-Virus-Scanned: amavis at zimbra.eb.localhost Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavis, port 10026) with ESMTP id X6HBgPiXxMeW for ; Wed, 4 Sep 2024 12:11:53 +0200 (CEST) Received: from zimbra.eb.localhost (zimbra.eb.localhost [192.168.96.204]) by mail.embedded-brains.de (Postfix) with ESMTP id EDFDA4800A3 for ; Wed, 4 Sep 2024 12:11:53 +0200 (CEST) Date: Wed, 4 Sep 2024 12:11:53 +0200 (CEST) From: Sebastian Huber To: qemu-devel Message-ID: <1832886563.20496.1725444713946.JavaMail.zimbra@embedded-brains.de> Subject: Are floating-point exceptions usable on AArch64? MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [192.168.96.204] X-Mailer: Zimbra 9.0.0_GA_4615 (ZimbraWebClient - FF128 (Linux)/9.0.0_GA_4615) Thread-Index: 9coovJvrd0AO0HcKDIyxuH2twUXlpA== Thread-Topic: Are floating-point exceptions usable on AArch64? X-Authenticated-Sender: smtp-embedded@poldi-networks.de X-Virus-Scanned: Clear (ClamAV 1.0.5/27388/Wed Sep 4 10:40:46 2024) Received-SPF: pass client-ip=85.10.215.148; envelope-from=sebastian.huber@embedded-brains.de; helo=dedi548.your-server.de 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, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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 Hello, I tried to provoke a division-by-zero exception on AArch64 using: uint64_t value; __asm__ volatile ( "mrs %0, FPCR\n" "orr %0, %0, 0x200\n" "msr FPCR, %0" : "=3D&r" ( value ) : : "memory" ); volatile double x =3D 0x0; volatile double y =3D 0x0; x /=3D y; When I look with the debugger at $fpcr it still says 0x0 after the msr. Are= floating-point exceptions usable on AArch64 in general? --=20 embedded brains GmbH & Co. KG Herr Sebastian HUBER Dornierstr. 4 82178 Puchheim Germany email: sebastian.huber@embedded-brains.de phone: +49-89-18 94 741 - 16 fax: +49-89-18 94 741 - 08 Registergericht: Amtsgericht M=C3=BCnchen Registernummer: HRB 157899 Vertretungsberechtigte Gesch=C3=A4ftsf=C3=BChrer: Peter Rasmussen, Thomas D= =C3=B6rfler Unsere Datenschutzerkl=C3=A4rung finden Sie hier: https://embedded-brains.de/datenschutzerklaerung/