Re: [avr-gcc-list] ELF R_AVR_13_PCREL Relocation

[Dylan McKay]

In `binutils/bfd/elf32-avr.c`, the line that actually computes the relocation:

`x = (x & 0xf000) | (srel & 0xfff);`

Is only modifying bits in the `0xfff` mask, a total of 12 bits.

This makes it seem even more strange.

On Thu, Feb 19, 2015 at 3:11 PM, Dylan McKay <address@hidden> wrote:

Hello,

I'm working on a port 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