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MC/Mach-O/ARM: Stub out RecordARMRelocation, which is mostly a copy of 

RecordRelocation with lots of FIXMEs.

llvm-svn: 122402
This commit is contained in:
Daniel Dunbar 2010-12-22 13:50:05 +00:00
parent a63db77f2e
commit 083132e131
1 changed files with 78 additions and 1 deletions
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79
llvm/lib/MC/MachObjectWriter.cpp
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@ -846,7 +846,84 @@ public:
void RecordARMRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,
const MCFragment *Fragment, const MCFixup &Fixup,
MCValue Target, uint64_t &FixedValue) {
// FIXME!
unsigned IsPCRel = isFixupKindPCRel(Asm, Fixup.getKind());
// FIXME: Eliminate this!
unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind());
// If this is a difference or a defined symbol plus an offset, then we need
// a scattered relocation entry. Differences always require scattered
// relocations.
if (Target.getSymB())
return RecordScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
// Get the symbol data, if any.
MCSymbolData *SD = 0;
if (Target.getSymA())
SD = &Asm.getSymbolData(Target.getSymA()->getSymbol());
// FIXME: For other platforms, we need to use scattered relocations for
// internal relocations with offsets. If this is an internal relocation
// with an offset, it also needs a scattered relocation entry.
//
// Is this right for ARM?
uint32_t Offset = Target.getConstant();
if (IsPCRel)
Offset += 1 << Log2Size;
if (Offset && SD && !doesSymbolRequireExternRelocation(SD))
return RecordScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
// See <reloc.h>.
uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();
unsigned Index = 0;
unsigned IsExtern = 0;
unsigned Type = 0;
if (Target.isAbsolute()) { // constant
// FIXME!
report_fatal_error("FIXME: relocations to absolute targets "
"not yet implemented");
} else if (SD->getSymbol().isVariable()) {
int64_t Res;
if (SD->getSymbol().getVariableValue()->EvaluateAsAbsolute(
Res, Layout, SectionAddress)) {
FixedValue = Res;
return;
}
report_fatal_error("unsupported relocation of variable '" +
SD->getSymbol().getName() + "'");
} else {
// Check whether we need an external or internal relocation.
if (doesSymbolRequireExternRelocation(SD)) {
IsExtern = 1;
Index = SD->getIndex();
// For external relocations, make sure to offset the fixup value to
// compensate for the addend of the symbol address, if it was
// undefined. This occurs with weak definitions, for example.
if (!SD->Symbol->isUndefined())
FixedValue -= Layout.getSymbolOffset(SD);
} else {
// The index is the section ordinal (1-based).
Index = SD->getFragment()->getParent()->getOrdinal() + 1;
FixedValue += getSectionAddress(SD->getFragment()->getParent());
}
if (IsPCRel)
FixedValue -= getSectionAddress(Fragment->getParent());
Type = macho::RIT_Vanilla;
}
// struct relocation_info (8 bytes)
macho::RelocationEntry MRE;
MRE.Word0 = FixupOffset;
MRE.Word1 = ((Index << 0) |
(IsPCRel << 24) |
(Log2Size << 25) |
(IsExtern << 27) |
(Type << 28));
Relocations[Fragment->getParent()].push_back(MRE);
}
void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout,