[all-commits] [llvm/llvm-project] 9195b0: [ELF][PPC64] Enable R_PPC64_REL14 trunks

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9195b0191130a8d5f1751f60b3489782ca5dc315
      https://github.com/llvm/llvm-project/commit/9195b0191130a8d5f1751f60b3489782ca5dc315
  Author: Fangrui Song <maskray at google.com>
  Date:   2020-04-04 (Sat, 04 Apr 2020)

  Changed paths:
    M lld/ELF/Thunks.cpp
    A lld/test/ELF/ppc64-long-branch-rel14.s

  Log Message:
  -----------
  [ELF][PPC64] Enable R_PPC64_REL14 trunks

The thunk implementation is available but an assertion disallows it.
Linux kernel has such a use case: in arch/powerpc/kernel/exceptions-64s.S:handle_page_fault,
beq+ ret_from_except_lite may get out of range.

Link: https://github.com/ClangBuiltLinux/linux/issues/951

Differential Revision: https://reviews.llvm.org/D76904