[avr-gcc-list] Specification of AVR ELF format?

[Wim Lewis]

Does documentation exist anywhere on the ELF format used by AVR 
toolchains? For most architectures, there's a "processor supplement" 
document describing the necessary magic numbers, relocation types, and so 
on. I can find no documentation at all for AVR, however, except for the 
binutils source code itself.

I'm looking for this because I want to write a tool that deals with AVR 
ELF binaries. If no documentation currently exists, I'm interested in 
writing something that at least describes current avr-gcc practice, 
especially the mapping between the AVR's various memory spaces and the 
flat ELF memory model.