[avr-gcc-list] ELF R_AVR_13

avr-gcc-list

[avr-gcc-list] ELF R_AVR_13_PCREL Relocation

From:	Dylan McKay
Subject:	[avr-gcc-list] ELF R_AVR_13_PCREL Relocation
Date:	Thu, 19 Feb 2015 15:11:06 +1300

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

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[avr-gcc-list] ELF R_AVR_13_PCREL Relocation, Dylan McKay <=
- Re: [avr-gcc-list] ELF R_AVR_13_PCREL Relocation, Dylan McKay, 2015/02/18
- Re: [avr-gcc-list] ELF R_AVR_13_PCREL Relocation, Jeff Barlow, 2015/02/18
  - Re: [avr-gcc-list] ELF R_AVR_13_PCREL Relocation, Dylan McKay, 2015/02/18
    - Re: [avr-gcc-list] ELF R_AVR_13_PCREL Relocation, Jan Waclawek, 2015/02/19