[asan] [llvm] [mips] adding ShadowOffset64 for mips64

[sdkie]

Summary

adding asan ShadowOffset64 for mips64 in llvm
Corresponding compiler-rt patch - http://reviews.llvm.org/D6024

[kcc]

LGTM, I will commit this shortly

[kcc]

.. after another commit to the same file...

[kcc]

r221725.

lib/Transforms/Instrumentation/AddressSanitizer.cpp

 
 static const uint64_t kDefaultShadowScale = 3;
 static const uint64_t kDefaultShadowOffset32 = 1ULL << 29;
 static const uint64_t kIOSShadowOffset32 = 1ULL << 30;
 static const uint64_t kDefaultShadowOffset64 = 1ULL << 44;
 static const uint64_t kSmallX86_64ShadowOffset = 0x7FFF8000;  // < 2G.
 static const uint64_t kPPC64_ShadowOffset64 = 1ULL << 41;
 static const uint64_t kMIPS32_ShadowOffset32 = 0x0aaa0000;
+static const uint64_t kMIPS64_ShadowOffset64 = 1ULL << 36;
 static const uint64_t kFreeBSD_ShadowOffset32 = 1ULL << 30;
 static const uint64_t kFreeBSD_ShadowOffset64 = 1ULL << 46;
 
 static const size_t kMinStackMallocSize = 1 << 6;  // 64B
 static const size_t kMaxStackMallocSize = 1 << 16;  // 64K
 static const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3;
 static const uintptr_t kRetiredStackFrameMagic = 0x45E0360E;
 
static ShadowMapping getShadowMapping(const Module &M, int LongSize) {
   bool IsIOS = TargetTriple.isiOS();
   bool IsFreeBSD = TargetTriple.getOS() == llvm::Triple::FreeBSD;
   bool IsLinux = TargetTriple.getOS() == llvm::Triple::Linux;
   bool IsPPC64 = TargetTriple.getArch() == llvm::Triple::ppc64 ||
                  TargetTriple.getArch() == llvm::Triple::ppc64le;
   bool IsX86_64 = TargetTriple.getArch() == llvm::Triple::x86_64;
   bool IsMIPS32 = TargetTriple.getArch() == llvm::Triple::mips ||
                   TargetTriple.getArch() == llvm::Triple::mipsel;
+  bool IsMIPS64 = TargetTriple.getArch() == llvm::Triple::mips64 ||
+                  TargetTriple.getArch() == llvm::Triple::mips64el;
 
   ShadowMapping Mapping;
 
   if (LongSize == 32) {
     if (IsAndroid)
       Mapping.Offset = 0;
     else if (IsMIPS32)
       Mapping.Offset = kMIPS32_ShadowOffset32;
     else if (IsFreeBSD)
       Mapping.Offset = kFreeBSD_ShadowOffset32;
     else if (IsIOS)
       Mapping.Offset = kIOSShadowOffset32;
     else
       Mapping.Offset = kDefaultShadowOffset32;
   } else {  // LongSize == 64
     if (IsPPC64)
       Mapping.Offset = kPPC64_ShadowOffset64;
     else if (IsFreeBSD)
       Mapping.Offset = kFreeBSD_ShadowOffset64;
     else if (IsLinux && IsX86_64)
       Mapping.Offset = kSmallX86_64ShadowOffset;
+    else if (IsMIPS64)
+      Mapping.Offset = kMIPS64_ShadowOffset64;
     else
       Mapping.Offset = kDefaultShadowOffset64;
   }
 
   Mapping.Scale = kDefaultShadowScale;
   if (ClMappingScale) {
     Mapping.Scale = ClMappingScale;
   }