[llvm] r251624 - [sanitizer] [msan] Unify aarch64 mapping

[Adhemerval Zanella via llvm-commits]

Author: azanella
Date: Thu Oct 29 08:02:30 2015
New Revision: 251624

URL: http://llvm.org/viewvc/llvm-project?rev=251624&view=rev
Log:
[sanitizer] [msan] Unify aarch64 mapping

This patch unify the 39-bit and 42-bit mapping for aarch64 to use only
one instrumentation algorithm.  This removes compiler flag 
SANITIZER_AARCH64_VMA requirement for MSAN on aarch64.

The mapping to use now is for 39 and 42-bits:

    0x00000000000ULL-0x01000000000ULL  MappingDesc::INVALID
    0x01000000000ULL-0x02000000000ULL  MappingDesc::SHADOW
    0x02000000000ULL-0x03000000000ULL  MappingDesc::ORIGIN
    0x03000000000ULL-0x04000000000ULL  MappingDesc::SHADOW
    0x04000000000ULL-0x05000000000ULL  MappingDesc::ORIGIN
    0x05000000000ULL-0x06000000000ULL  MappingDesc::APP
    0x06000000000ULL-0x07000000000ULL  MappingDesc::INVALID
    0x07000000000ULL-0x08000000000ULL  MappingDesc::APP

And only for 42-bits:

    0x08000000000ULL-0x09000000000ULL  MappingDesc::INVALID
    0x09000000000ULL-0x0A000000000ULL  MappingDesc::SHADOW
    0x0A000000000ULL-0x0B000000000ULL  MappingDesc::ORIGIN
    0x0B000000000ULL-0x0F000000000ULL  MappingDesc::INVALID
    0x0F000000000ULL-0x10000000000ULL  MappingDesc::APP
    0x10000000000ULL-0x11000000000ULL  MappingDesc::INVALID
    0x11000000000ULL-0x12000000000ULL  MappingDesc::APP
    0x12000000000ULL-0x17000000000ULL  MappingDesc::INVALID
    0x17000000000ULL-0x18000000000ULL  MappingDesc::SHADOW
    0x18000000000ULL-0x19000000000ULL  MappingDesc::ORIGIN
    0x19000000000ULL-0x20000000000ULL  MappingDesc::INVALID
    0x20000000000ULL-0x21000000000ULL  MappingDesc::APP
    0x21000000000ULL-0x26000000000ULL  MappingDesc::INVALID
    0x26000000000ULL-0x27000000000ULL  MappingDesc::SHADOW
    0x27000000000ULL-0x28000000000ULL  MappingDesc::ORIGIN
    0x28000000000ULL-0x29000000000ULL  MappingDesc::SHADOW
    0x29000000000ULL-0x2A000000000ULL  MappingDesc::ORIGIN
    0x2A000000000ULL-0x2B000000000ULL  MappingDesc::APP
    0x2B000000000ULL-0x2C000000000ULL  MappingDesc::INVALID
    0x2C000000000ULL-0x2D000000000ULL  MappingDesc::SHADOW
    0x2D000000000ULL-0x2E000000000ULL  MappingDesc::ORIGIN
    0x2E000000000ULL-0x2F000000000ULL  MappingDesc::APP
    0x2F000000000ULL-0x39000000000ULL  MappingDesc::INVALID
    0x39000000000ULL-0x3A000000000ULL  MappingDesc::SHADOW
    0x3A000000000ULL-0x3B000000000ULL  MappingDesc::ORIGIN
    0x3B000000000ULL-0x3C000000000ULL  MappingDesc::APP
    0x3C000000000ULL-0x3D000000000ULL  MappingDesc::INVALID
    0x3D000000000ULL-0x3E000000000ULL  MappingDesc::SHADOW
    0x3E000000000ULL-0x3F000000000ULL  MappingDesc::ORIGIN
    0x3F000000000ULL-0x40000000000ULL  MappingDesc::APP

And although complex it provides a better memory utilization that
previous one.

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=251624&r1=251623&r2=251624&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/MemorySanitizer.cpp Thu Oct 29 08:02:30 2015
@@ -120,16 +120,6 @@ using namespace llvm;
 
 #define DEBUG_TYPE "msan"
 
-// VMA size definition for architecture that support multiple sizes.
-// AArch64 has 3 VMA sizes: 39, 42 and 48.
-#ifndef SANITIZER_AARCH64_VMA
-# define SANITIZER_AARCH64_VMA 39
-#else
-# if SANITIZER_AARCH64_VMA != 39 && SANITIZER_AARCH64_VMA != 42
-#  error "invalid SANITIZER_AARCH64_VMA size"
-# endif
-#endif
-
 static const unsigned kOriginSize = 4;
 static const unsigned kMinOriginAlignment = 4;
 static const unsigned kShadowTLSAlignment = 8;
@@ -263,17 +253,10 @@ static const MemoryMapParams Linux_Power
 
 // aarch64 Linux
 static const MemoryMapParams Linux_AArch64_MemoryMapParams = {
-#if SANITIZER_AARCH64_VMA == 39
-  0x007C00000000,  // AndMask
-  0x000100000000,  // XorMask
-  0x004000000000,  // ShadowBase
-  0x004300000000,  // OriginBase
-#elif SANITIZER_AARCH64_VMA == 42
-  0x03E000000000,  // AndMask
-  0x001000000000,  // XorMask
-  0x010000000000,  // ShadowBase
-  0x012000000000,  // OriginBase
-#endif
+  0,               // AndMask (not used)
+  0x06000000000,   // XorMask
+  0,               // ShadowBase (not used)
+  0x01000000000,   // OriginBase
 };
 
 // i386 FreeBSD