[llvm] 9f492a9 - [MIPS] Fix the ASAN shadow offset hook for the N32 ABI

[Djordje Todorovic via llvm-commits]

Author: Dimitrije Milosevic
Date: 2022-07-06T12:44:28+02:00
New Revision: 9f492a9ae5cf9fc9d89c9da837cdb652207a2d6e

URL: https://github.com/llvm/llvm-project/commit/9f492a9ae5cf9fc9d89c9da837cdb652207a2d6e
DIFF: https://github.com/llvm/llvm-project/commit/9f492a9ae5cf9fc9d89c9da837cdb652207a2d6e.diff

LOG: [MIPS] Fix the ASAN shadow offset hook for the N32 ABI

Currently, LLVM doesn't have the correct shadow offset
mapping for the n32 ABI.
This patch introduces the correct shadow offset value
for the n32 ABI - 1ULL << 29.

Differential Revision: https://reviews.llvm.org/D127096

Added: 
    

Modified: 
    llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index 7a5a74aa4fff9..4fed4bd18fb18 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -101,6 +101,7 @@ static const uint64_t kSmallX86_64ShadowOffsetAlignMask = ~0xFFFULL;
 static const uint64_t kLinuxKasan_ShadowOffset64 = 0xdffffc0000000000;
 static const uint64_t kPPC64_ShadowOffset64 = 1ULL << 44;
 static const uint64_t kSystemZ_ShadowOffset64 = 1ULL << 52;
+static const uint64_t kMIPS_ShadowOffsetN32 = 1ULL << 29;
 static const uint64_t kMIPS32_ShadowOffset32 = 0x0aaa0000;
 static const uint64_t kMIPS64_ShadowOffset64 = 1ULL << 37;
 static const uint64_t kAArch64_ShadowOffset64 = 1ULL << 36;
@@ -476,6 +477,7 @@ static ShadowMapping getShadowMapping(const Triple &TargetTriple, int LongSize,
                  TargetTriple.getArch() == Triple::ppc64le;
   bool IsSystemZ = TargetTriple.getArch() == Triple::systemz;
   bool IsX86_64 = TargetTriple.getArch() == Triple::x86_64;
+  bool IsMIPSN32ABI = TargetTriple.getEnvironment() == Triple::GNUABIN32;
   bool IsMIPS32 = TargetTriple.isMIPS32();
   bool IsMIPS64 = TargetTriple.isMIPS64();
   bool IsArmOrThumb = TargetTriple.isARM() || TargetTriple.isThumb();
@@ -496,6 +498,8 @@ static ShadowMapping getShadowMapping(const Triple &TargetTriple, int LongSize,
   if (LongSize == 32) {
     if (IsAndroid)
       Mapping.Offset = kDynamicShadowSentinel;
+    else if (IsMIPSN32ABI)
+      Mapping.Offset = kMIPS_ShadowOffsetN32;
     else if (IsMIPS32)
       Mapping.Offset = kMIPS32_ShadowOffset32;
     else if (IsFreeBSD)