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

[Martin Krüger]

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

__________________________________________________________________
Digitalkameras - Aktuelle Angebote unter EUR 90,- www.ebay.de!!
Über 1 Mio. Angebote zu günstigen Preisen! eBay - Jetzt besser kaufen!