[PATCH] D89138: [AArch64] Implement .variant_pcs directive

[Cullen Rhodes via Phabricator via llvm-commits]

c-rhodes created this revision.
c-rhodes added reviewers: sdesmalen, efriedma, ctetreau.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
c-rhodes requested review of this revision.

A dynamic linker with lazy binding support may need to handle variant
PCS function symbols specially, so an ELF symbol table marking
STO_AARCH64_VARIANT_PCS [1] was added to address this.

Function symbols that follow the vector PCS are marked via the
.variant_pcs assembler directive, which takes a single parameter
specifying the symbol name and sets the STO_AARCH64_VARIANT_PCS st_other
flag in the object file.

[1] https://github.com/ARM-software/abi-aa/blob/master/aaelf64/aaelf64.rst#st-other-values


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89138

Files:
  llvm/include/llvm/BinaryFormat/ELF.h
  llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
  llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
  llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
  llvm/lib/Target/AArch64/MCTargetDesc/AArch64TargetStreamer.h
  llvm/test/CodeGen/AArch64/variant-pcs.ll
  llvm/test/MC/AArch64/directive-variant_pcs-err.s
  llvm/test/MC/AArch64/directive-variant_pcs.s

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