bankswitching support in binutils

[Simon Richter]

Hi,

David D. Hagood wrote:
> I am working with a build of binutils and GCC supplied by Cypress 
> Semiconductors for their EZUSB chips. Unfortunately, this code isn't in 
> the mainline branches (probably because Cypress didn't want to maintain 
> it).

Well, they need to maintain it one way or the other.

> The chip supports bankswitched memory, but I don't know if bankswitch 
> support is in binutils. So, I'd like some pointers as to where to look 
> in the code for binutils to see if this is present, and if so, how to 
> use it to park routines in different banks.

My approach to a problem like this would be via linker relaxation, where 
the object files contain code to do bank switched accesses to all code 
and data and hints how to replace them by simple accesses in case the 
code happens to be accessible from the bank the PC is currently on.

What would be needed in ld would be a way to specify that functions may 
not cross certain "boundaries", and a gas that would create the 
appropriate code for jumps.

At least the 80C51 does not have initialized data, so the matter of 
accessing that is a non-issue for now.

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Gesundheit.[1]

    Simon

[1] Yes, I am aware that you did not add the footer yourself.
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