[all-commits] [llvm/llvm-project] 3fd9c9: [lldb][AArch64] Correct top nibble setting in memo...

[David Spickett via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fd9c90bdc04df451d9bb348450b5ad424c822c6
      https://github.com/llvm/llvm-project/commit/3fd9c90bdc04df451d9bb348450b5ad424c822c6
  Author: David Spickett <david.spickett at linaro.org>
  Date:   2022-01-12 (Wed, 12 Jan 2022)

  Changed paths:
    M lldb/test/API/linux/aarch64/mte_tag_access/TestAArch64LinuxMTEMemoryTagAccess.py
    M lldb/test/API/linux/aarch64/mte_tag_access/main.c

  Log Message:
  -----------
  [lldb][AArch64] Correct top nibble setting in memory tag read tests

Due to a missing cast the << 60 always resulted in zero leaving
the top nibble empty. So we weren't actually testing that lldb
ignores those bits in addition to the tag bits.

Correct that and also set the top nibbles to ascending values
so that we can catch if lldb only removes one of the tag bits
and top nibble, but not both.

In future the tag manager will likely only remove the tag bits
and leave non-address bits to the ABI plugin but for now make
sure we're testing what we claim to implement.