source code of crtm48.o

[Massimiliano Cialdi <cialdi@xxxxxxxxxxx>]

I use winavr 20040720 (gcc 3.4.1), and atmega48

I need to change vector table and entry point. Where can I find source
code of crtm48.o (or other crtmxx.o)?
How can I change vectors?

thanks

-- 
Massimiliano Cialdi
cialdi@xxxxxxxxxxx
m.cialdi@xxxxxxxx