From owner-freebsd-i386@FreeBSD.ORG Sun Aug 28 18:00:43 2005 Return-Path: X-Original-To: freebsd-i386@hub.freebsd.org Delivered-To: freebsd-i386@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8D2E16A423 for ; Sun, 28 Aug 2005 18:00:43 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1800443D72 for ; Sun, 28 Aug 2005 18:00:32 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.3/8.13.3) with ESMTP id j7SI0Vho089230 for ; Sun, 28 Aug 2005 18:00:31 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.3/8.13.1/Submit) id j7SI0VRX089224; Sun, 28 Aug 2005 18:00:31 GMT (envelope-from gnats) Resent-Date: Sun, 28 Aug 2005 18:00:31 GMT Resent-Message-Id: <200508281800.j7SI0VRX089224@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-i386@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Chuck Ebbert <76306.1226@compuserve.com> Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 51E6116A41F for ; Sun, 28 Aug 2005 17:59:07 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2502743D46 for ; Sun, 28 Aug 2005 17:59:07 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id j7SHx6fG072284 for ; Sun, 28 Aug 2005 17:59:06 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id j7SHx6Yo072283; Sun, 28 Aug 2005 17:59:06 GMT (envelope-from nobody) Message-Id: <200508281759.j7SHx6Yo072283@www.freebsd.org> Date: Sun, 28 Aug 2005 17:59:06 GMT From: Chuck Ebbert <76306.1226@compuserve.com> To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-2.3 Cc: Subject: i386/85417: Possible bug in ia32 floating-point exception handler X-BeenThere: freebsd-i386@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: I386-specific issues for FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Aug 2005 18:00:44 -0000 >Number: 85417 >Category: i386 >Synopsis: Possible bug in ia32 floating-point exception handler >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-i386 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Aug 28 18:00:31 GMT 2005 >Closed-Date: >Last-Modified: >Originator: Chuck Ebbert >Release: RELENG_6 >Organization: >Environment: >Description: src/sys/i386/i386/trap.c 1.277.2.1 lines 303-308: 303: case T_ARITHTRAP: /* arithmetic trap */ 304: #ifdef DEV_NPX 305: ucode = npxtrap(); 306: if (ucode == -1) 307: goto userout; 308: #else src/sys/i386/isa/npx.c:npxtrap() can never return -1, so SIGFPE code 0 will be sent to the user app if no unmasked i387 exception bits are set. This can happen on some non-Intel processors. >How-To-Repeat: >Fix: (1) If the current behavior is correct, remove the if statement at line 306 since it has no effect and only confuses reviewers. (2) Otherwise, change fpetable[] in src/sys/i386/isa/npx.c so entry 0 is -1 instead of 0 >Release-Note: >Audit-Trail: >Unformatted: