[PATCH] D13818: [compiler-rt] [msan] Unify aarch64 mapping

[Adhemerval Zanella via llvm-commits]

zatrazz created this revision.
zatrazz added reviewers: pcc, rengolin, eugenis, kcc, samsonov.
zatrazz added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

This patch unify the 39-bit and 42-bit mapping for aarch64 using only
one instrumentation algorithm (based on 39-bit mapping).  A runtime
check avoid mapping 42-bit only segments for 39-bit kernels.

The LLVM instrumentation change is at [1]. The only downside of this
patch is for 42-bit VMA the 39-bit shadow/origin segments will be created
regardless. However a patch is possible to filter out this based on runtime
VMA information.

[1] http://reviews.llvm.org/D13817

http://reviews.llvm.org/D13818

Files:
  lib/msan/msan.cc
  lib/msan/msan.h
  lib/msan/msan_linux.cc
  test/msan/mmap.cc
  test/msan/strlen_of_shadow.cc

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