Re: Relocating application architecture and compiler support

From: glen herrmannsfeldt (gah_at_ugcs.caltech.edu)
Date: 01/26/05 

Date: Tue, 25 Jan 2005 17:49:51 -0800

Anne & Lynn Wheeler wrote:
> Edward Wolfgram <Not_Edward_Wolfgram@notiwaysoftware.com> writes:

>>Lynn's example is not relocateable to the level you are thinking-
>>that is, relocateable at an interrupt level. Once execution starts,
>>virtual (not physical) memory addresses must stay put.

>>The relocatabilty you are talking about can be done, but it would be
>>enormously difficult and a PIA. It would mean that all memory
>>(address) references must be atomic. E.g.

> i had a very simple objective that the executable program image on
> disk would be identical to the executable program image in virtual
> memory and that the same executable program image could appear (using
> virtual memory segment sharing) could appear concurrently in multiple
> different virtual address spaces at potentially different virtual
> addresses.

Different objectives have been discussed in this thread, both
with and without S/370 style DAT. If one wanted to do
timesharing on S/360 including relocating programs as they were
swapped in and out, something more complex would be required,
possibly including conventions on register use.

It was nice of S/370 to come along when it did to remove the
need for that problem.

-- glen

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