[uClibc] setjmp, longjmp

[Rahul Trivedi]

hi,
i was reading up the uclibc code and wanted to know what exactly forms the 
environment that needs to be saved when the setjmp call is made.
like for ARM it saves fp, sp, lr and the registers v1-v6. What is the 
significance of these registers ?
Basically wanted to know that if i want to write setjmp for a different 
architecture then what registers do i need to save.
many thanks
rahul