Re: the memory model being used in elks?

[u-vpoa@aetey.se]

On Sat, May 09, 2015 at 01:50:44PM -0400, Jody Bruchon wrote:
> On 5/9/2015 1:47 PM, u-vpoa@aetey.se wrote:
> >IOW, as much as I can see, the binary is built correctly and it is
> >the memory allocation by the kernel which looks surprizing.

> It is my understanding that bcc assumes DS=ES=SS and both stack and heap
> data use the same code segment.

Yes, this is fine.

> How did you determine the memory usage of
> the program to be 60K? Does that include all usage or only heap usage?

I counted the approximate size of the static and allocated data
objects and also tested. This includes all the data ("data+bss"+heap+stack).

This worked fine with separate i/d on Venix/86 on IBM PC XT, where DS=SS
and heap and stack grew from the opposite ends of the segment, heap from
the bottom up and the stack from the top down (the hole in the middle if
big enough was used for other processes' data, not wasted iirc).

Venix also had kernel support for ES as extra data of a process so
f.i. access to the graphic memory was done via ES. The compiler was not
involved in these tricks, it just did not use ES.

Rl