[all-commits] [llvm/llvm-project] d6d0b6: unwind: repair register restoration for OR1K

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d6d0b6559e97a3d0b258814e870d3e19f3a7ffcc
      https://github.com/llvm/llvm-project/commit/d6d0b6559e97a3d0b258814e870d3e19f3a7ffcc
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2021-08-02 (Mon, 02 Aug 2021)

  Changed paths:
    M libunwind/src/UnwindRegistersRestore.S

  Log Message:
  -----------
  unwind: repair register restoration for OR1K

Currently, OR1K architecture put the program counter at offset 0x128 of
the current `or1k_thread_state_t`. However, the PC is restored after
updating the thread pointer in `r3`, which causes the PC to be fetched
incorrectly.

This patch swaps the order of restoration of `r9` and `r3`, such that
the PC is restored to `r9` using the current thread state.

Patch by Oi Chee Cheung!

Reviewed By: whitequark, compnerd

Differential Revision: https://reviews.llvm.org/D107042