Regarding problem in interrupt

hi all

I am using Stellaris ware package for my application and code 
compilation by Gcc in Linux. At first i got error message for "_sbrk" 
and ".ARM.exidx" then by editing my linker script i got solved these 
problems. But still i am getting warning message for ".ARM.exidx part 
unlinked" but application get compiled. But the variables which i have 
used in interrupt routines are not updating when i am printing those 
variables its updating, when i removed printf statement its not 
updating. Variables which i have used are global variables. Any one 
could help me to solve the problem?

thanks all

regards
vivek