From 45cea084aa0cf835abc6fb99540b5aec7983d494 Mon Sep 17 00:00:00 2001
From: Sagar Thakur <sagar.thakur@imgtec.com>
Date: Thu, 6 Oct 2016 09:52:06 +0000
Subject: [PATCH] [EfficiencySanitizer] Adds shadow memory parameters for
 40-bit virtual memory address.

Adding 40-bit shadow memory parameters because MIPS64 uses 40-bit virtual memory addresses.

Reviewed by rengolin.
Differential: https://reviews.llvm.org/D23801


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283433 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Instrumentation/EfficiencySanitizer.cpp        | 36 ++++++++++++++++------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp b/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
index 735728a7d41..3bd666be7b9 100644
--- a/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
+++ b/lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
@@ -99,12 +99,23 @@ static const char *const EsanWhichToolName = "__esan_which_tool";
 // FIXME: Try to place these shadow constants, the names of the __esan_*
 // interface functions, and the ToolType enum into a header shared between
 // llvm and compiler-rt.
-static const uint64_t ShadowMask = 0x00000fffffffffffull;
-static const uint64_t ShadowOffs[3] = { // Indexed by scale
-  0x0000130000000000ull,
-  0x0000220000000000ull,
-  0x0000440000000000ull,
-};
+struct ShadowMemoryParams {
+  uint64_t ShadowMask;
+  uint64_t ShadowOffs[3];
+} ShadowParams;
+
+static const ShadowMemoryParams ShadowParams47 = {
+    0x00000fffffffffffull,
+    {
+        0x0000130000000000ull, 0x0000220000000000ull, 0x0000440000000000ull,
+    }};
+
+static const ShadowMemoryParams ShadowParams40 = {
+    0x0fffffffffull,
+    {
+        0x1300000000ull, 0x2200000000ull, 0x4400000000ull,
+    }};
+
 // This array is indexed by the ToolType enum.
 static const int ShadowScale[] = {
   0, // ESAN_None.
@@ -528,6 +539,13 @@ void EfficiencySanitizer::createDestructor(Module &M, Constant *ToolInfoArg) {
 }
 
 bool EfficiencySanitizer::initOnModule(Module &M) {
+
+  Triple TargetTriple(M.getTargetTriple());
+  if (TargetTriple.getArch() == Triple::mips64 || TargetTriple.getArch() == Triple::mips64el)
+    ShadowParams = ShadowParams40;
+  else
+    ShadowParams = ShadowParams47;
+
   Ctx = &M.getContext();
   const DataLayout &DL = M.getDataLayout();
   IRBuilder<> IRB(M.getContext());
@@ -559,13 +577,13 @@ bool EfficiencySanitizer::initOnModule(Module &M) {
 
 Value *EfficiencySanitizer::appToShadow(Value *Shadow, IRBuilder<> &IRB) {
   // Shadow = ((App & Mask) + Offs) >> Scale
-  Shadow = IRB.CreateAnd(Shadow, ConstantInt::get(IntptrTy, ShadowMask));
+  Shadow = IRB.CreateAnd(Shadow, ConstantInt::get(IntptrTy, ShadowParams.ShadowMask));
   uint64_t Offs;
   int Scale = ShadowScale[Options.ToolType];
   if (Scale <= 2)
-    Offs = ShadowOffs[Scale];
+    Offs = ShadowParams.ShadowOffs[Scale];
   else
-    Offs = ShadowOffs[0] << Scale;
+    Offs = ShadowParams.ShadowOffs[0] << Scale;
   Shadow = IRB.CreateAdd(Shadow, ConstantInt::get(IntptrTy, Offs));
   if (Scale > 0)
     Shadow = IRB.CreateLShr(Shadow, Scale);
-- 
2.11.0