[llvm] r318045 - [PowerPC][msan] Update msan to handle changed memory layouts in newer kernels

[Bill Seurer via llvm-commits]

Author: seurer
Date: Mon Nov 13 07:43:19 2017
New Revision: 318045

URL: http://llvm.org/viewvc/llvm-project?rev=318045&view=rev
Log:
[PowerPC][msan] Update msan to handle changed memory layouts in newer kernels

In more recent Linux kernels (including those with 47 bit VMAs) the layout of
virtual memory for powerpc64 changed causing the memory sanitizer to not
work properly. This patch adjusts a bit mask in the memory sanitizer to work
on the newer kernels while continuing to work on the older ones as well.

This is the non-runtime part of the patch and finishes it. ref: r317802

Tested on several 4.x and 3.x kernel releases.

Modified:
    llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp

Modified: llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp?rev=318045&r1=318044&r2=318045&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp Mon Nov 13 07:43:19 2017
@@ -290,7 +290,7 @@ static const MemoryMapParams Linux_MIPS6
 
 // ppc64 Linux
 static const MemoryMapParams Linux_PowerPC64_MemoryMapParams = {
-  0x200000000000,  // AndMask
+  0xE00000000000,  // AndMask
   0x100000000000,  // XorMask
   0x080000000000,  // ShadowBase
   0x1C0000000000,  // OriginBase