ELF R_AVR_13_PCREL Relocation

Dylan McKay <[email protected]> Thu, 19 Feb 2015 15:11:06 +1300

Newsgroups	gmane.comp.hardware.avr.gcc
Message-ID	<CAHAccTPcE-819Cj30a2L_V4LRLMFJPAUQULc=YvReTQNy-YZ1w@mail.gmail.com>

Hello,

I'm working on a port <https://github.com/avr-llvm/llvm> of LLVM for AVR. I
am currently adding AVR support to the linker, but I have a question about
something that seems strange.

This relocation is solely for the relative `jmp` and `call` instructions
(if I'm not mistaken).

Both of these instructions have exactly 12 bits for their target address.
Why is the relocation 13 bits then?

Thanks,
Dylan

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