From 4f867bfada573f775e22c7564abe5502f1665a67 Mon Sep 17 00:00:00 2001 From: Lang Hames Date: Mon, 18 Aug 2014 21:43:16 +0000 Subject: [MCJIT] Respect target endianness in RuntimeDyldMachO and RuntimeDyldChecker. This patch may address some of the issues described in http://llvm.org/PR20640. llvm-svn: 215938 --- llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp') diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp index 986daef8a90..3e27a8b8d55 100644 --- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp +++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp @@ -110,11 +110,18 @@ void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE, << " Size: " << (1 << RE.Size) << "\n"; } -bool RuntimeDyldMachO::writeBytesUnaligned(uint8_t *Addr, uint64_t Value, +bool RuntimeDyldMachO::writeBytesUnaligned(uint8_t *Dst, uint64_t Value, unsigned Size) { - for (unsigned i = 0; i < Size; ++i) { - *Addr++ = (uint8_t)Value; - Value >>= 8; + + + // 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(&Value) + Size - 1; + for (unsigned i = 0; i < Size; ++i) + *Dst++ = *Src--; } return false; -- cgit v1.2.3