[PATCH] D17333: [lld] [AArch64] Initial TLSDESC relocations support

[Adhemerval Zanella via llvm-commits]

zatrazz created this revision.
zatrazz added reviewers: ruiu, rafael.
zatrazz added a subscriber: llvm-commits.
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Herald added subscribers: rengolin, aemerson.

Default Global Dynamic TLS relocation generation for AArch64 is done by
TLSDESC and TLSCALL / GNU2 tls and for shared mode it requires creating
dynamic R_AARCH64_TLSDESC relocations.

This patch adds initial support for TLSDESC relocation for AArch64. On
TargetInfo class a new hook is added, isTlsGlobalDescDynamicRel, to
indicate the TLS GD should be handled a TLSDESC one and special
handling and dynamic relocation generation is added on
handleTlsRelocation.

No relax optimization is added and there is room to some optimizations.
Along with 'Fix R_AARCH64_ABS64 in Shared mode' [1] patch I could
bootstrap lld and run all the tests withouth failure.

[1] http://reviews.llvm.org/D17265

Repository:
  rL LLVM

http://reviews.llvm.org/D17333

Files:
  ELF/InputSection.cpp
  ELF/Target.cpp
  ELF/Target.h
  ELF/Writer.cpp
  test/ELF/aarch64-tls-tlsdesc.s

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