From owner-freebsd-i386@FreeBSD.ORG Tue Jan 10 11:00:31 2012 Return-Path: Delivered-To: freebsd-i386@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BFF7A1065706 for ; Tue, 10 Jan 2012 11:00:31 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 825F08FC1D for ; Tue, 10 Jan 2012 11:00:31 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q0AB0VjW000851 for ; Tue, 10 Jan 2012 11:00:31 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.5/8.14.5/Submit) id q0AB0VS2000850; Tue, 10 Jan 2012 11:00:31 GMT (envelope-from gnats) Resent-Date: Tue, 10 Jan 2012 11:00:31 GMT Resent-Message-Id: <201201101100.q0AB0VS2000850@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, Yaniv Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 322EF1065670 for ; Tue, 10 Jan 2012 10:53:00 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from red.freebsd.org (red.freebsd.org [IPv6:2001:4f8:fff6::22]) by mx1.freebsd.org (Postfix) with ESMTP id 21AD78FC12 for ; Tue, 10 Jan 2012 10:53:00 +0000 (UTC) Received: from red.freebsd.org (localhost [127.0.0.1]) by red.freebsd.org (8.14.4/8.14.4) with ESMTP id q0AAqw4Z037325 for ; Tue, 10 Jan 2012 10:52:58 GMT (envelope-from nobody@red.freebsd.org) Received: (from nobody@localhost) by red.freebsd.org (8.14.4/8.14.4/Submit) id q0AAqwbh037321; Tue, 10 Jan 2012 10:52:58 GMT (envelope-from nobody) Message-Id: <201201101052.q0AAqwbh037321@red.freebsd.org> Date: Tue, 10 Jan 2012 10:52:58 GMT From: Yaniv To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: i386/163985: Incorrect operand size in boot0 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: Tue, 10 Jan 2012 11:00:31 -0000 >Number: 163985 >Category: i386 >Synopsis: Incorrect operand size in boot0 >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: Tue Jan 10 11:00:31 UTC 2012 >Closed-Date: >Last-Modified: >Originator: Yaniv >Release: 8.2 >Organization: >Environment: >Description: In boot0.S, decw instruction is used on the drive number that was received from the loader. boot0 push the loader dx value, at early stage, and restore it later into ax popw %ax # Drive number subb $0x80-0x1,%al # Does next cmpb NHRDRV,%al # drive exist? (from BIOS?) jb print_drive # Yes /* * If this is the only drive, don't display it as an option. */ decw %ax # Already drive 0? jz print_prompt # Yes According to my knowledge, dh is undefined during the jump to boot0-start so the result of "decw %ax" is undefined. The result is that an incorrect boot option is displayed. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted: