Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!killer!pollux!dalsqnt!rpp386!jfh From: jfh@rpp386.Dallas.TX.US (The Beach Bum) Newsgroups: comp.unix.wizards Subject: Data in text segment (was: Re: Problem with xstr) Summary: don't worry, amos. just don't do it again ... Message-ID: <7124@rpp386.Dallas.TX.US> Date: 26 Sep 88 03:02:23 GMT References: <159@taux02.UUCP> Reply-To: jfh@rpp386.Dallas.TX.US (The Beach Bum) Organization: HASA, "S" Division Lines: 15 In article <159@taux02.UUCP> amos@taux02.UUCP (Amos Shapir) writes: >Thanks to all people who corrected my mistake - separate I/D pdp11 cannot >support text-segment shared data. It's been a long time since I hacked >a pdp11 :-( most modern CPU's can support separate I&D space in some sense by way of protection bits, etc. in the MMU. i think Zilog Z8000's support it more or less directly, like the PDP-11's did. the rest of the world has EXECUTE bits in the MMU which (may or may not) inhibit data cycles to text segments. -- John F. Haugh II (jfh@rpp386.Dallas.TX.US) HASA, "S" Division "Why waste negative entropy on comments, when you could use the same entropy to create bugs instead?" -- Steve Elias