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Diffstat (limited to 'lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp')
-rw-r--r--lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp128
1 files changed, 79 insertions, 49 deletions
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
index 1073c6fc52..1ebcaf7ba8 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp
@@ -187,8 +187,8 @@ ObjectImage *RuntimeDyldELF::createObjectImage(ObjectBuffer *Buffer) {
RuntimeDyldELF::~RuntimeDyldELF() {
}
-void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
+void RuntimeDyldELF::resolveX86_64Relocation(const SectionEntry &Section,
+ uint64_t Offset,
uint64_t Value,
uint32_t Type,
int64_t Addend) {
@@ -197,8 +197,10 @@ void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
llvm_unreachable("Relocation type not implemented yet!");
break;
case ELF::R_X86_64_64: {
- uint64_t *Target = (uint64_t*)(LocalAddress);
+ uint64_t *Target = reinterpret_cast<uint64_t*>(Section.Address + Offset);
*Target = Value + Addend;
+ DEBUG(dbgs() << "Writing " << format("%p", (Value + Addend))
+ << " at " << format("%p\n",Target));
break;
}
case ELF::R_X86_64_32:
@@ -208,37 +210,52 @@ void RuntimeDyldELF::resolveX86_64Relocation(uint8_t *LocalAddress,
(Type == ELF::R_X86_64_32S &&
((int64_t)Value <= INT32_MAX && (int64_t)Value >= INT32_MIN)));
uint32_t TruncatedAddr = (Value & 0xFFFFFFFF);
- uint32_t *Target = reinterpret_cast<uint32_t*>(LocalAddress);
+ uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset);
*Target = TruncatedAddr;
+ DEBUG(dbgs() << "Writing " << format("%p", TruncatedAddr)
+ << " at " << format("%p\n",Target));
break;
}
case ELF::R_X86_64_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ // Get the placeholder value from the generated object since
+ // a previous relocation attempt may have overwritten the loaded version
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress
+ + Offset);
+ uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset);
+ uint64_t FinalAddress = Section.LoadAddress + Offset;
int64_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
assert(RealOffset <= INT32_MAX && RealOffset >= INT32_MIN);
int32_t TruncOffset = (RealOffset & 0xFFFFFFFF);
- *Placeholder = TruncOffset;
+ *Target = TruncOffset;
break;
}
}
}
-void RuntimeDyldELF::resolveX86Relocation(uint8_t *LocalAddress,
- uint32_t FinalAddress,
+void RuntimeDyldELF::resolveX86Relocation(const SectionEntry &Section,
+ uint64_t Offset,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
switch (Type) {
case ELF::R_386_32: {
- uint32_t *Target = (uint32_t*)(LocalAddress);
- uint32_t Placeholder = *Target;
- *Target = Placeholder + Value + Addend;
+ // Get the placeholder value from the generated object since
+ // a previous relocation attempt may have overwritten the loaded version
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress
+ + Offset);
+ uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset);
+ *Target = *Placeholder + Value + Addend;
break;
}
case ELF::R_386_PC32: {
- uint32_t *Placeholder = reinterpret_cast<uint32_t*>(LocalAddress);
+ // Get the placeholder value from the generated object since
+ // a previous relocation attempt may have overwritten the loaded version
+ uint32_t *Placeholder = reinterpret_cast<uint32_t*>(Section.ObjAddress
+ + Offset);
+ uint32_t *Target = reinterpret_cast<uint32_t*>(Section.Address + Offset);
+ uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
uint32_t RealOffset = *Placeholder + Value + Addend - FinalAddress;
- *Placeholder = RealOffset;
+ *Target = RealOffset;
break;
}
default:
@@ -249,16 +266,18 @@ void RuntimeDyldELF::resolveX86Relocation(uint8_t *LocalAddress,
}
}
-void RuntimeDyldELF::resolveARMRelocation(uint8_t *LocalAddress,
- uint32_t FinalAddress,
+void RuntimeDyldELF::resolveARMRelocation(const SectionEntry &Section,
+ uint64_t Offset,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
// TODO: Add Thumb relocations.
- uint32_t* TargetPtr = (uint32_t*)LocalAddress;
+ uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset);
+ uint32_t FinalAddress = ((Section.LoadAddress + Offset) & 0xFFFFFFFF);
Value += Addend;
- DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: " << LocalAddress
+ DEBUG(dbgs() << "resolveARMRelocation, LocalAddress: "
+ << Section.Address + Offset
<< " FinalAddress: " << format("%p",FinalAddress)
<< " Value: " << format("%x",Value)
<< " Type: " << format("%x",Type)
@@ -310,16 +329,18 @@ void RuntimeDyldELF::resolveARMRelocation(uint8_t *LocalAddress,
}
}
-void RuntimeDyldELF::resolveMIPSRelocation(uint8_t *LocalAddress,
- uint32_t FinalAddress,
+void RuntimeDyldELF::resolveMIPSRelocation(const SectionEntry &Section,
+ uint64_t Offset,
uint32_t Value,
uint32_t Type,
int32_t Addend) {
- uint32_t* TargetPtr = (uint32_t*)LocalAddress;
+ uint32_t* TargetPtr = (uint32_t*)(Section.Address + Offset);
Value += Addend;
- DEBUG(dbgs() << "resolveMipselocation, LocalAddress: " << LocalAddress
- << " FinalAddress: " << format("%p",FinalAddress)
+ DEBUG(dbgs() << "resolveMipselocation, LocalAddress: "
+ << Section.Address + Offset
+ << " FinalAddress: "
+ << format("%p",Section.LoadAddress + Offset)
<< " Value: " << format("%x",Value)
<< " Type: " << format("%x",Type)
<< " Addend: " << format("%x",Addend)
@@ -467,11 +488,12 @@ uint16_t applyPPChighest (uint64_t value)
return (value >> 48) & 0xffff;
}
-void RuntimeDyldELF::resolvePPC64Relocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
- uint64_t Value,
- uint32_t Type,
- int64_t Addend) {
+void RuntimeDyldELF::resolvePPC64Relocation(const SectionEntry &Section,
+ uint64_t Offset,
+ uint64_t Value,
+ uint32_t Type,
+ int64_t Addend) {
+ uint8_t* LocalAddress = Section.Address + Offset;
switch (Type) {
default:
llvm_unreachable("Relocation type not implemented yet!");
@@ -495,6 +517,7 @@ void RuntimeDyldELF::resolvePPC64Relocation(uint8_t *LocalAddress,
writeInt16BE(LocalAddress + 2, (aalk & 3) | ((Value + Addend) & 0xfffc));
} break;
case ELF::R_PPC64_REL24 : {
+ uint64_t FinalAddress = (Section.LoadAddress + Offset);
int32_t delta = static_cast<int32_t>(Value - FinalAddress + Addend);
if (SignExtend32<24>(delta) != delta)
llvm_unreachable("Relocation R_PPC64_REL24 overflow");
@@ -521,34 +544,34 @@ void RuntimeDyldELF::resolvePPC64Relocation(uint8_t *LocalAddress,
}
-void RuntimeDyldELF::resolveRelocation(uint8_t *LocalAddress,
- uint64_t FinalAddress,
+void RuntimeDyldELF::resolveRelocation(const SectionEntry &Section,
+ uint64_t Offset,
uint64_t Value,
uint32_t Type,
int64_t Addend) {
switch (Arch) {
case Triple::x86_64:
- resolveX86_64Relocation(LocalAddress, FinalAddress, Value, Type, Addend);
+ resolveX86_64Relocation(Section, Offset, Value, Type, Addend);
break;
case Triple::x86:
- resolveX86Relocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
+ resolveX86Relocation(Section, Offset,
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::arm: // Fall through.
case Triple::thumb:
- resolveARMRelocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
+ resolveARMRelocation(Section, Offset,
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::mips: // Fall through.
case Triple::mipsel:
- resolveMIPSRelocation(LocalAddress, (uint32_t)(FinalAddress & 0xffffffffL),
+ resolveMIPSRelocation(Section, Offset,
(uint32_t)(Value & 0xffffffffL), Type,
(uint32_t)(Addend & 0xffffffffL));
break;
case Triple::ppc64:
- resolvePPC64Relocation(LocalAddress, FinalAddress, Value, Type, Addend);
+ resolvePPC64Relocation(Section, Offset, Value, Type, Addend);
break;
default: llvm_unreachable("Unsupported CPU type!");
}
@@ -628,13 +651,12 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
// This is an ARM branch relocation, need to use a stub function.
DEBUG(dbgs() << "\t\tThis is an ARM branch relocation.");
SectionEntry &Section = Sections[Rel.SectionID];
- uint8_t *Target = Section.Address + Rel.Offset;
// Look for an existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
- resolveRelocation(Target, (uint64_t)Target, (uint64_t)Section.Address +
- i->second, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + i->second, RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
// Create a new stub function.
@@ -649,8 +671,9 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
else
addRelocationForSection(RE, Value.SectionID);
- resolveRelocation(Target, (uint64_t)Target, (uint64_t)Section.Address +
- Section.StubOffset, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + Section.StubOffset,
+ RelType, 0);
Section.StubOffset += getMaxStubSize();
}
} else if (Arch == Triple::mipsel && RelType == ELF::R_MIPS_26) {
@@ -668,9 +691,8 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
// Look up for existing stub.
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address +
- i->second, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + i->second, RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
// Create a new stub function.
@@ -695,9 +717,9 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
addRelocationForSection(RELo, Value.SectionID);
}
- resolveRelocation(Target, (uint64_t)Target,
- (uint64_t)Section.Address +
- Section.StubOffset, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + Section.StubOffset,
+ RelType, 0);
Section.StubOffset += getMaxStubSize();
}
} else if (Arch == Triple::ppc64) {
@@ -731,8 +753,8 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
StubMap::const_iterator i = Stubs.find(Value);
if (i != Stubs.end()) {
// Symbol function stub already created, just relocate to it
- resolveRelocation(Target, (uint64_t)Target, (uint64_t)Section.Address
- + i->second, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + i->second, RelType, 0);
DEBUG(dbgs() << " Stub function found\n");
} else {
// Create a new stub function.
@@ -770,8 +792,9 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
addRelocationForSection(REl, Value.SectionID);
}
- resolveRelocation(Target, (uint64_t)Target, (uint64_t)Section.Address
- + Section.StubOffset, RelType, 0);
+ resolveRelocation(Section, Rel.Offset,
+ (uint64_t)Section.Address + Section.StubOffset,
+ RelType, 0);
if (SymType == SymbolRef::ST_Unknown)
// Restore the TOC for external calls
writeInt32BE(Target+4, 0xE8410028); // ld r2,40(r1)
@@ -796,6 +819,13 @@ void RuntimeDyldELF::processRelocationRef(const ObjRelocationInfo &Rel,
}
}
+unsigned RuntimeDyldELF::getCommonSymbolAlignment(const SymbolRef &Sym) {
+ // In ELF, the value of an SHN_COMMON symbol is its alignment requirement.
+ uint64_t Align;
+ Check(Sym.getValue(Align));
+ return Align;
+}
+
bool RuntimeDyldELF::isCompatibleFormat(const ObjectBuffer *Buffer) const {
if (Buffer->getBufferSize() < strlen(ELF::ElfMagic))
return false;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2025-02-16 14:39:14 +0000