[PATCH] D37556: [ARC] Prepare the implementation of relocation for lld

[Leslie Zhai via Phabricator via llvm-commits]

xiangzhai created this revision.

Hi LLVM developers,

Prepare the implementation of ARC target ELF relocation for lld, so at present it needs ARC GNU toolchain <https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain> to generate ELF object:

  $ cat arc-hello.s
  main:
    bl memset
    bl strncpy
    bl puts
  
  $ /opt/arc-gnu/bin/arc-elf32-gcc -mcpu=arc600 -o arc-hello.o -c arc-hello.s

Relocation:

  $ /opt/arc-gnu/bin/arc-elf32-readelf -r arc-hello.o
  
  Relocation section '.rela.text' at offset 0x108 contains 3 entries:
   Offset     Info    Type            Sym.Value  Sym. Name + Addend
  00000000  00000611 R_ARC_S25W_PCREL  00000000   memset + 0
  00000004  00000711 R_ARC_S25W_PCREL  00000000   strncpy + 0
  00000008  00000811 R_ARC_S25W_PCREL  00000000   puts + 0

LLD:

  $ /opt/llvm-svn/bin/ld.lld -o arc-hello-lld arc-hello.o -L/opt/arc-gnu/lib/gcc/arc-elf32/7.1.1/arc600 -L/opt/arc-gnu/lib/gcc/arc-elf32/7.1.1/../../../../arc-elf32/lib/arc600 -L/opt/arc-gnu/lib/gcc/arc-elf32/7.1.1 -L/opt/arc-gnu/lib/gcc/arc-elf32/7.1.1/../../../../arc-elf32/lib --start-group -lgcc -lc -lnosys --end-group -Ttext=0

Please review it, thanks a lot!

Regards,
Leslie Zhai


Repository:
  rL LLVM

https://reviews.llvm.org/D37556

Files:
  include/llvm/BinaryFormat/ELF.h
  include/llvm/BinaryFormat/ELFRelocs/ARC.def
  include/llvm/module.modulemap
  lib/Object/ELF.cpp

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