From: Lang Hames <lhames@gmail.com>
Date: Wed, 27 Aug 2014 17:41:06 +0000 (+0000)
Subject: [MCJIT] More endianness fixes for RuntimeDyldMachO.
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=commitdiff_plain;h=644e3c077cd31f57e37833c3b2044b2facbb56d8

[MCJIT] More endianness fixes for RuntimeDyldMachO.

http://llvm.org/PR20640



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216567 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
index 3fa89c61508..72aae96e0c6 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
@@ -703,15 +703,18 @@ uint64_t RuntimeDyldCheckerImpl::readMemoryAtAddr(uint64_t SrcAddr,
                                                   unsigned Size) const {
   uintptr_t PtrSizedAddr = static_cast<uintptr_t>(SrcAddr);
   assert(PtrSizedAddr == SrcAddr && "Linker memory pointer out-of-range.");
-  uint8_t *Src = reinterpret_cast<uint8_t *>(PtrSizedAddr);
   uint64_t Result = 0;
+  uint8_t *Src = reinterpret_cast<uint8_t*>(PtrSizedAddr);
+  uint8_t *Dst = reinterpret_cast<uint8_t*>(&Result);
 
   // If host and target endianness match use memcpy, otherwise copy in reverse
   // order.
-  if (getRTDyld().IsTargetLittleEndian == sys::IsLittleEndianHost)
-    memcpy(&Result, Src, Size);
-  else {
-    uint8_t *Dst = reinterpret_cast<uint8_t*>(&Result) + Size - 1;
+  if (getRTDyld().IsTargetLittleEndian == sys::IsLittleEndianHost) {
+    if (!sys::IsLittleEndianHost)
+      Dst += sizeof(Result) - Size;
+    memcpy(Dst, Src, Size);
+  } else {
+    Dst += Size - 1;
     for (unsigned i = 0; i < Size; ++i)
       *Dst-- = *Src++;
   }
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
index 35736a4df2c..9e4d3ac82af 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
@@ -29,10 +29,21 @@ namespace llvm {
 
 int64_t RuntimeDyldMachO::memcpyAddend(const RelocationEntry &RE) const {
   const SectionEntry &Section = Sections[RE.SectionID];
-  uint8_t *LocalAddress = Section.Address + RE.Offset;
   unsigned NumBytes = 1 << RE.Size;
   int64_t Addend = 0;
-  memcpy(&Addend, LocalAddress, NumBytes);
+  uint8_t *LocalAddress = Section.Address + RE.Offset;
+  uint8_t *Dst = reinterpret_cast<uint8_t*>(&Addend);
+
+  if (IsTargetLittleEndian == sys::IsLittleEndianHost) {
+    if (!sys::IsLittleEndianHost)
+      Dst += sizeof(Addend) - NumBytes;
+    memcpy(Dst, LocalAddress, NumBytes);
+  } else {
+    Dst += NumBytes - 1;
+    for (unsigned i = 0; i < NumBytes; ++i)
+      *Dst-- = *LocalAddress++;
+  }
+
   return Addend;
 }
 
@@ -113,13 +124,15 @@ void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE,
 bool RuntimeDyldMachO::writeBytesUnaligned(uint8_t *Dst, uint64_t Value,
                                            unsigned Size) {
 
-
+  uint8_t *Src = reinterpret_cast<uint8_t*>(&Value);
   // If host and target endianness match use memcpy, otherwise copy in reverse
   // order.
-  if (IsTargetLittleEndian == sys::IsLittleEndianHost)
-    memcpy(Dst, &Value, Size);
-  else {
-    uint8_t *Src = reinterpret_cast<uint8_t*>(&Value) + Size - 1;
+  if (IsTargetLittleEndian == sys::IsLittleEndianHost) {
+    if (!sys::IsLittleEndianHost)
+      Src += sizeof(Value) - Size;
+    memcpy(Dst, Src, Size);
+  } else {
+    Src += Size - 1;
     for (unsigned i = 0; i < Size; ++i)
       *Dst++ = *Src--;
   }