[all-commits] [llvm/llvm-project] 1c4f33: [PAC][lld] Use braa instr in PAC PLT sequence with...

[Daniil Kovalev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1c4f335ec29c6bb269d0f8b2d6149d439312c69a
      https://github.com/llvm/llvm-project/commit/1c4f335ec29c6bb269d0f8b2d6149d439312c69a
  Author: Daniil Kovalev <dkovalev at accesssoftek.com>
  Date:   2024-11-18 (Mon, 18 Nov 2024)

  Changed paths:
    M lld/ELF/Arch/AArch64.cpp
    M lld/test/ELF/aarch64-feature-pauth.s

  Log Message:
  -----------
  [PAC][lld] Use braa instr in PAC PLT sequence with valid PAuth core info (#113945)

Assume PAC instructions being supported with PAuth core info different from (0,0). The (0,0) value means that an ELF file is incompatible with PAuth - see https://github.com/ARM-software/abi-aa/blob/2024Q3/pauthabielf64/pauthabielf64.rst#core-information. With PAC non-hint instructions supported, `autia1716; br x17` can be replaced with `braa x17, x16; nop`, where `braa` is an authenticated branch instruction using IA key, discriminator from x16 and signed target address from x17.



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