From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,63e8a95e8331225 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-04-22 14:19:42 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!router1.news.adelphia.net!router2.news.adelphia.net!news2.news.adelphia.net.POSTED!not-for-mail From: Ed Falis Newsgroups: comp.lang.ada Subject: Re: Partial Hardware Protection for Buffer Overrun Exploits Message-ID: <20030422171827.6fb01e6d.falis@adelphia.net> References: <3EA41F8E.8030305@cogeco.ca> Organization: Ada Core Technologies X-Newsreader: Sylpheed version 0.8.11 (GTK+ 1.2.10; i386-debian-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Date: Tue, 22 Apr 2003 21:19:19 GMT NNTP-Posting-Host: 24.53.11.222 X-Complaints-To: abuse@adelphia.net X-Trace: news2.news.adelphia.net 1051046359 24.53.11.222 (Tue, 22 Apr 2003 17:19:19 EDT) NNTP-Posting-Date: Tue, 22 Apr 2003 17:19:19 EDT Xref: archiver1.google.com comp.lang.ada:36372 Date: 2003-04-22T21:19:19+00:00 List-Id: On 22 Apr 2003 17:15:09 -0400 Robert A Duff wrote: > The 80186 did not support protected mode. It was practically > identical in architecture to an 8086 or 8088. The 80186 had a small > number of additional instructions -- e.g., pushall for pushing all > registers, I think (for some definition of "all"). It also had bank-switching of memory, but that doesn't quite qualify as "protected mode". > > It was used in mainly in embedded systems, I believe. > > >... and the 80286 chips that powered the IBM PC/AT. These early chips > > supported a command for transitioning from real to protected mode, > > but no simple command for transitioning back to real mode. This is > > what earned these chips the "brain dead" assessment from Gates. Yeah, but that brain-dead design actually allowed the first Ada compiler on a PC. ;-) - Ed