Article View: comp.sys.amiga.tech
Article #73Re: Address Spaces (was Re: (Fairly) Complete Amiga VM design)
From: Mark Huth
Date: Thu, 15 Jun 1989 19:24
Date: Thu, 15 Jun 1989 19:24
19 lines
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1533 bytes
In article <55595@linus.UUCP> eachus@mbunix.mitre.org (Robert I. Eachus) writes: >specific locations in memory. However, beginning with the PDP-11, a >technique called position independant code was available which >permitted code to be loaded without relocation. The VAX and 68000 > > The Amiga from day one has required that code be written this >way, and on the 68000 family this type of code is generally faster. Sorry, the Amiga relocates stuff at load time - thats what the REL32 hunk types are for. The object code I've looked at on the Amiga is a curious mixture of PIC and bound code, with base register addressing thrown in for library references. The Amiga allows just about any type of code to be written and loaded, just as the 68000 support most addressing modes - and by the time you get to the '020+ you finally get full support for PIC. The 68000 PC relative addressing is limited to +/- 32k bytes. Mark Huth
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mcdchg!behemoth!mph From: mph@behemoth.phx.mcd.mot.com (Mark Huth) Newsgroups: comp.sys.amiga.tech Subject: Re: Address Spaces (was Re: (Fairly) Complete Amiga VM design) Keywords: virtual memory, address space Message-ID: <11097@behemoth.phx.mcd.mot.com> Date: 15 Jun 89 19:24:11 GMT References: <8906010252.AA11810@jade.berkeley.edu> <367@xdos.UUCP> <54912@linus.UUCP> <377@xdos.UUCP> <55595@linus.UUCP> Reply-To: mph@behemoth.UUCP (Mark Huth) Organization: Motorola Microcomputer Division, Tempe, Az. Lines: 19