Re: [avr-gcc-list] Problem with the calling convention

[Yuan Mei]

I think you'd better reduce the number of arguments for a single function.
Because the resource on avr is quite low.

On Wed, 14 Jul 2004 10:49:13 GMT , Martin Krüger <address@hidden> wrote:
> Hello everybody
> 
> I am developing an application for an avr device by first compiling ist as an 
> linux executable,
> then if everything ist fine so far compiling it for the avr.
> 
> I noticed a bug in my application which only existst on the avr,but not in 
> the linux executable.
> So i thought this could be a problem with the compiler.
> I looked in the assembler files,now i can exactly describe the problem.
> 
> I wrote a funtion with this arguments:
> 
> (arg1 16bit,arg2 8bit,arg3 8bit,arg4 32bit)
> 
> The following calling-convention ist used:
> 
> arg1  r25,r24 (r25 MSB)
> arg2 r22
> arg3 r20
> arg4 r19-r16 (r19 MSB)
> 
> The problem ist   another function called using r19,r18 without pushing
> and restoring its values.
> I used this workaround:
> 
> *compiling with -S (stop before assembling)
> *adding the required push and pop mnemonics
> *assembling
> 
> I am using avr-gcc version  3.4.0
> 
> Any suggestions?
> 
> Martin Kruger
> 
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-- 
Yuan Mei