a8c4d48478
At the moment errors in relocation processing such as out of range values are not detected or at best trapped by asserts which will not be present in release builds. This patch adds support for checking error return values from applyRelocation() calls and printing an appropriate error message. It also adds support for printing multiple errors rather than just the first one. llvm-svn: 226557
94 lines
3.2 KiB
C++
94 lines
3.2 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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return make_unhandled_reloc_error();
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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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: _ppcLinkingContext(context),
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_ppcTargetLayout(new PPCTargetLayout<PPCELFType>(context)),
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_ppcRelocationHandler(new PPCTargetRelocationHandler()) {}
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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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