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[RuntimeDyld] Handle endiannes differences between the host and target while

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reading MachO files magic numbers in RuntimeDyld.

This is required now that we're testing cross-platform JITing (via
RuntimeDyldChecker), and should fix some issues that David Fang has seen on PPC
builds.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213012 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2014-07-14 23:19:50 +00:00
parent 3afd71fc7d
commit a8940be6df
1 changed files with 19 additions and 14 deletions
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33
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp
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@ -120,8 +120,21 @@ public:
}
};
static uint32_t readMachOMagic(const char *InputBuffer, unsigned BufferSize) {
if (BufferSize < 4)
return 0;
StringRef Magic(InputBuffer, 4);
if (Magic == "\xFE\xED\xFA\xCE" || Magic == "\xCE\xFA\xED\xFE")
return 0xFEEDFACE;
else if (Magic == "\xFE\xED\xFA\xCF" || Magic == "\xCF\xFA\xED\xFE")
return 0xFEEDFACF;
// else
return 0;
}
ObjectImage *RuntimeDyldMachO::createObjectImage(ObjectBuffer *Buffer) {
uint32_t magic = *((const uint32_t *)Buffer->getBufferStart());
uint32_t magic = readMachOMagic(Buffer->getBufferStart(),
Buffer->getBufferSize());
bool is64 = (magic == MachO::MH_MAGIC_64);
assert((magic == MachO::MH_MAGIC_64 || magic == MachO::MH_MAGIC) &&
"Unrecognized Macho Magic");
@ -136,7 +149,8 @@ ObjectImage *RuntimeDyldMachO::createObjectImageFromFile(
MemoryBuffer *Buffer =
MemoryBuffer::getMemBuffer(ObjFile->getData(), "", false);
uint32_t magic = *((const uint32_t *)Buffer->getBufferStart());
uint32_t magic = readMachOMagic(Buffer->getBufferStart(),
Buffer->getBufferSize());
bool is64 = (magic == MachO::MH_MAGIC_64);
assert((magic == MachO::MH_MAGIC_64 || magic == MachO::MH_MAGIC) &&
"Unrecognized Macho Magic");
@ -955,18 +969,9 @@ relocation_iterator RuntimeDyldMachO::processRelocationRef(
bool
RuntimeDyldMachO::isCompatibleFormat(const ObjectBuffer *InputBuffer) const {
if (InputBuffer->getBufferSize() < 4)
return false;
StringRef Magic(InputBuffer->getBufferStart(), 4);
if (Magic == "\xFE\xED\xFA\xCE")
return true;
if (Magic == "\xCE\xFA\xED\xFE")
return true;
if (Magic == "\xFE\xED\xFA\xCF")
return true;
if (Magic == "\xCF\xFA\xED\xFE")
return true;
return false;
uint32_t Magic = readMachOMagic(InputBuffer->getBufferStart(),
InputBuffer->getBufferSize());
return (Magic == 0xFEEDFACE || Magic == 0xFEEDFACF);
}
bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile *Obj) const {