[PATCH] D46255: [ELF][AArch64] Implement the AArch64 TLSLD_LDST_LO12 family of relocs

Mon Apr 30 02:34:42 PDT 2018

peter.smith created this revision.
peter.smith added reviewers: ruiu, espindola.
Herald added subscribers: kristof.beyls, arichardson, emaste, rengolin.
Herald added a reviewer: javed.absar.

Implement the following relocations for AArch64:
R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC

These are specified in ELF for the 64-bit Arm Architecture (http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf)

These relocation directives were first used in an optimisation in https://reviews.llvm.org/D44355 . This had to be reverted as no linker (gold, ld.bfd or lld) implemented these relocations. Both gold and ld.bfd have since implemented support (https://sourceware.org/bugzilla/show_bug.cgi?id=22969 and https://sourceware.org/bugzilla/show_bug.cgi?id=22970 ) so it would be good to have LLD support as well.

Fixes pr36727

https://reviews.llvm.org/D46255

Files:
  ELF/Arch/AArch64.cpp
  test/ELF/aarch64-tlsld-ldst.s

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