[PATCH] D37615: [ELF] Implement the relocations of AVR for LLD

[Leslie Zhai via Phabricator via llvm-commits]

xiangzhai updated this revision to Diff 114972.
xiangzhai added a comment.

Add testcase for tinyAVR <http://www.atmel.com/products/microcontrollers/avr/tinyavr.aspx> about `R_AVR_LDS_STS_16`:

  $ avr-gcc -mmcu=attiny40 -o tiny-avr.o -c tiny-avr.s
  $ avr-readelf -r tiny-avr.o
  
  Relocation section '.rela.text' at offset 0xa4 contains 2 entries:
   Offset     Info    Type            Sym.Value  Sym. Name + Addend
  00000000  00000121 R_AVR_LDS_STS_16  00000000   .text + 2
  00000002  00000103 R_AVR_13_PCREL    00000000   .text + 2

Relocated by avr-ld:

Memory access is limited to the address range 0x40...0xbf. so use 0x40 as high address:

  $ avr-ld --no-warn-mismatch -o tiny-avr tiny-avr.o -Ttext=40
  $ avr-objdump -d tiny-avr
  
  tiny-avr:     file format elf32-avr
  
  
  Disassembly of section .text:
  
  00000040 <__ctors_end>:
    40:   12 a1           ldd     r17, Z+34       ; 0x22
  
  00000042 <foo>:
    42:   ff cf           rjmp    .-2             ; 0x42 <foo>

It is equals to LLD:

  $ llvm/build/bin/ld.lld -o tiny-avr-lld tiny-avr.o -Ttext=40
  $ avr-objdump -d tiny-avr-lld 
  
  tiny-avr-lld:     file format elf32-avr
  
  
  Disassembly of section .text:
  
  00000040 <main>:
    40:   12 a1           ldd     r17, Z+34       ; 0x22
  
  00000042 <foo>:
    42:   ff cf           rjmp    .-2             ; 0x42 <foo>


Repository:
  rL LLVM

https://reviews.llvm.org/D37615

Files:
  ELF/Arch/AVR.cpp
  test/ELF/basic-avr.s
  test/ELF/tiny-avr.s

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