[MCJIT] Respect target endianness in RuntimeDyldMachO and RuntimeDyldChecker.

[oota-llvm.git] / lib / ExecutionEngine / RuntimeDyld / RuntimeDyldChecker.cpp

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
index d244f45b0803b767481b5d703acfca9aaa865ca0..02504a9cefcd3d3c7b9a3e995cee908bad9c6560 100644 (file)
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
@@ -705,7 +705,16 @@ uint64_t RuntimeDyldCheckerImpl::readMemoryAtAddr(uint64_t SrcAddr,
   assert(PtrSizedAddr == SrcAddr && "Linker memory pointer out-of-range.");
   uint8_t *Src = reinterpret_cast<uint8_t *>(PtrSizedAddr);
   uint64_t Result = 0;
-  memcpy(&Result, Src, Size);
+
+  // 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;
+    for (unsigned i = 0; i < Size; ++i)
+      *Dst-- = *Src++;
+  }
   return Result;
 }