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MC/Mach-O/ARM: Clone off an ARM version of RecordScatteredRelocation until I figure out how it is supposed to work.

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llvm-svn: 122410
This commit is contained in:
Daniel Dunbar 2010-12-22 16:45:29 +00:00
parent 985567aebc
commit 63f7a3a108
1 changed files with 68 additions and 4 deletions
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72
lib/MC/MachObjectWriter.cpp
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@ -796,6 +796,70 @@ public:
Relocations[Fragment->getParent()].push_back(MRE);
}
void RecordARMScatteredRelocation(const MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFragment *Fragment,
const MCFixup &Fixup, MCValue Target,
uint64_t &FixedValue) {
uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();
unsigned IsPCRel = isFixupKindPCRel(Asm, Fixup.getKind());
unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind());
unsigned Type = macho::RIT_Vanilla;
// See <reloc.h>.
const MCSymbol *A = &Target.getSymA()->getSymbol();
MCSymbolData *A_SD = &Asm.getSymbolData(*A);
if (!A_SD->getFragment())
report_fatal_error("symbol '" + A->getName() +
"' can not be undefined in a subtraction expression");
uint32_t Value = getSymbolAddress(A_SD, Layout);
uint64_t SecAddr = getSectionAddress(A_SD->getFragment()->getParent());
FixedValue += SecAddr;
uint32_t Value2 = 0;
if (const MCSymbolRefExpr *B = Target.getSymB()) {
MCSymbolData *B_SD = &Asm.getSymbolData(B->getSymbol());
if (!B_SD->getFragment())
report_fatal_error("symbol '" + B->getSymbol().getName() +
"' can not be undefined in a subtraction expression");
// Select the appropriate difference relocation type.
//
// Note that there is no longer any semantic difference between these two
// relocation types from the linkers point of view, this is done solely
// for pedantic compatibility with 'as'.
Type = A_SD->isExternal() ? (unsigned)macho::RIT_Difference :
(unsigned)macho::RIT_Generic_LocalDifference;
Value2 = getSymbolAddress(B_SD, Layout);
FixedValue -= getSectionAddress(B_SD->getFragment()->getParent());
}
// Relocations are written out in reverse order, so the PAIR comes first.
if (Type == macho::RIT_Difference ||
Type == macho::RIT_Generic_LocalDifference) {
macho::RelocationEntry MRE;
MRE.Word0 = ((0 << 0) |
(macho::RIT_Pair << 24) |
(Log2Size << 28) |
(IsPCRel << 30) |
macho::RF_Scattered);
MRE.Word1 = Value2;
Relocations[Fragment->getParent()].push_back(MRE);
}
macho::RelocationEntry MRE;
MRE.Word0 = ((FixupOffset << 0) |
(Type << 24) |
(Log2Size << 28) |
(IsPCRel << 30) |
macho::RF_Scattered);
MRE.Word1 = Value;
Relocations[Fragment->getParent()].push_back(MRE);
}
void RecordTLVPRelocation(const MCAssembler &Asm,
const MCAsmLayout &Layout,
const MCFragment *Fragment,
@ -889,8 +953,8 @@ public:
// a scattered relocation entry. Differences always require scattered
// relocations.
if (Target.getSymB())
return RecordScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
return RecordARMScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
// Get the symbol data, if any.
MCSymbolData *SD = 0;
@ -906,8 +970,8 @@ public:
if (IsPCRel)
Offset += 1 << Log2Size;
if (Offset && SD && !doesSymbolRequireExternRelocation(SD))
return RecordScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
return RecordARMScatteredRelocation(Asm, Layout, Fragment, Fixup,
Target, FixedValue);
// See <reloc.h>.
uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset();