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Re: [avr-gcc-list] 'clobber list' in ASM (was Simulation / Hex File

From: E. Weddington
Subject: Re: [avr-gcc-list] 'clobber list' in ASM (was Simulation / Hex File
Date: Tue, 24 Jun 2003 15:29:45 GMT

> Just another point...
> I was able to solve it by using R0 and R1 instead, as
> I didn't need a zero register in my code.
> But I'd still be interested in knowing about the
> clobber list thing.
Take a look at the avr-libc FAQ. There an answer there that 
lists the "calling convention", which is how to right 
assembly routines that can be called from C routines. It 
tells you which registers get used for different things, 
i.e. which registers you can clobber, which have to be 
restored, etc. This should probably help.


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