4c81bb7e3f
At present each TargetRelocationHandler generates a pretty similar error string and calls llvm_unreachable() when encountering an unknown relocation. This is not ideal for two reasons: 1. llvm_unreachable disappears in release builds but we still want to know if we encountered a relocation we couldn't handle in release builds. 2. Duplication is bad - there is no need to have a per-architecture error message. This change adds a test for AArch64 to test whether or not the error message actually works. The other architectures have not been tested but they compile and check-lld passes. llvm-svn: 223782
95 lines
3.3 KiB
C++
95 lines
3.3 KiB
C++
//===- lib/ReaderWriter/ELF/PPC/PPCTargetHandler.cpp ----------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCTargetHandler.h"
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#include "PPCLinkingContext.h"
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using namespace lld;
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using namespace elf;
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using namespace llvm::ELF;
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/// \brief The following relocation routines are derived from the
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/// SYSTEM V APPLICATION BINARY INTERFACE: PowerPC Processor Supplement
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/// Symbols used:
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/// A: Added used to compute the value, r_addend
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/// P: Place address of the field being relocated, r_offset
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/// S: Value of the symbol whose index resides in the relocation entry.
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/// \brief low24 (S + A - P) >> 2 : Verify
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static int relocB24PCREL(uint8_t *location, uint64_t P, uint64_t S,
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uint64_t A) {
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int32_t result = (uint32_t)(((S + A) - P));
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if ((result < 0x1000000) && (result > -0x1000000)) {
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result &= ~-(0x1000000);
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*reinterpret_cast<llvm::support::ubig32_t *>(location) = result |
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(uint32_t)*reinterpret_cast<llvm::support::ubig32_t *>(location);
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return 0;
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}
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return 1;
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}
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std::error_code PPCTargetRelocationHandler::applyRelocation(
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ELFWriter &writer, llvm::FileOutputBuffer &buf, const lld::AtomLayout &atom,
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const Reference &ref) const {
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uint8_t *atomContent = buf.getBufferStart() + atom._fileOffset;
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uint8_t *location = atomContent + ref.offsetInAtom();
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uint64_t targetVAddress = writer.addressOfAtom(ref.target());
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uint64_t relocVAddress = atom._virtualAddr + ref.offsetInAtom();
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if (ref.kindNamespace() != Reference::KindNamespace::ELF)
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return std::error_code();
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assert(ref.kindArch() == Reference::KindArch::PowerPC);
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switch (ref.kindValue()) {
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case R_PPC_REL24:
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relocB24PCREL(location, relocVAddress, targetVAddress, ref.addend());
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break;
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default:
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unhandledReferenceType(*atom._atom, ref);
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}
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return std::error_code();
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}
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PPCTargetHandler::PPCTargetHandler(PPCLinkingContext &context)
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: DefaultTargetHandler(context), _ppcLinkingContext(context),
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_ppcTargetLayout(new PPCTargetLayout<PPCELFType>(context)),
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_ppcRelocationHandler(
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new PPCTargetRelocationHandler(context, *_ppcTargetLayout.get())) {}
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void PPCTargetHandler::registerRelocationNames(Registry ®istry) {
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registry.addKindTable(Reference::KindNamespace::ELF,
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Reference::KindArch::PowerPC, kindStrings);
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}
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std::unique_ptr<Writer> PPCTargetHandler::getWriter() {
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switch (_ppcLinkingContext.getOutputELFType()) {
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case llvm::ELF::ET_EXEC:
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return std::unique_ptr<Writer>(new elf::ExecutableWriter<PPCELFType>(
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_ppcLinkingContext, *_ppcTargetLayout.get()));
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case llvm::ELF::ET_DYN:
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return std::unique_ptr<Writer>(new elf::DynamicLibraryWriter<PPCELFType>(
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_ppcLinkingContext, *_ppcTargetLayout.get()));
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case llvm::ELF::ET_REL:
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llvm_unreachable("TODO: support -r mode");
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default:
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llvm_unreachable("unsupported output type");
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}
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}
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#define ELF_RELOC(name, value) LLD_KIND_STRING_ENTRY(name),
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const Registry::KindStrings PPCTargetHandler::kindStrings[] = {
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#include "llvm/Support/ELFRelocs/PowerPC.def"
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LLD_KIND_STRING_END
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};
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#undef ELF_RELOC
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