[PATCH] D87504: [PowerPC][LLD] Support for PC Relative TLS for Local Dynamic

[Stefan Pintilie via Phabricator via llvm-commits]

stefanp created this revision.
stefanp added a reviewer: nemanjai.
Herald added subscribers: shchenz, kbarton, arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a reviewer: MaskRay.
Herald added a project: LLVM.
stefanp requested review of this revision.

Add support to LLD for PC Relative Thread Local Storage for Local Dynamic.
This patch adds support for two relocations: R_PPC64_GOT_TLSLD_PCREL34 and
R_PPC64_DTPREL34.

The Local Dynamic code is:

  pla r3, x at got@tlsld at pcrel        R_PPC64_GOT_TLSLD_PCREL34
  bl __tls_get_addr at notoc(x at tlsld) R_PPC64_TLSLD
                                   R_PPC64_REL24_NOTOC
  ...
  paddi r9, r3, x at dtprel           R_PPC64_DTPREL34

After relaxation to Local Exec:

  paddi r3, r13, 0x1000
  nop
  ...
  paddi r9, r3, x at dtprel          R_PPC64_DTPREL34


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87504

Files:
  lld/ELF/Arch/PPC64.cpp
  lld/ELF/Relocations.cpp
  lld/test/ELF/ppc64-tls-pcrel-ld.s

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