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DateTue, 8 Jan 2002 18:11:21 +0100
Fromjtv <>
SubjectRe: Whizzy New Feature: Paged segmented memory
On Tue, Jan 08, 2002 at 02:05:09PM +0000, Anthony DeRobertis wrote:
> Change gcc. Recompile world. All should work, assuming your gcc changes are 
> bug-free, no one made assumptions about stack layout, no one wrote assembly 
> code, etc. [In other words, after 4 months of debugging you might get X 
> running again...] 

And, of course, the same for all other software.  But for a highly secure
project, for instance, that might be worth it.


> Some architectures have hardware assistance for downward growing stacks. One 
> example is 68K. I think x86 does too. OTOH, I don't think PPC does, though I 
> haven't read the Green Book recently. 

68K has predecrement/postincrement addressing modes (I'm not sure that
counts as "forcing" the stack to grow downwards); PPC has a symmetrical
load/store-with-update IIRC.


Jeroen

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