forked from OSchip/llvm-project
74 lines
2.4 KiB
C++
74 lines
2.4 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 "PPCTargetInfo.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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namespace {
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/// \brief low24 (S + A - P) >> 2 : Verify
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int relocB24PCREL(uint8_t *location, uint64_t P, uint64_t S, 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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} // end anon namespace
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ErrorOr<void> 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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switch (ref.kind()) {
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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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case lld::Reference::kindLayoutAfter:
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case lld::Reference::kindLayoutBefore:
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case lld::Reference::kindInGroup:
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break;
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default : {
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std::string str;
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llvm::raw_string_ostream s(str);
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auto name = _targetInfo.stringFromRelocKind(ref.kind());
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s << "Unhandled relocation: "
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<< (name ? *name : "<unknown>" ) << " (" << ref.kind() << ")";
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s.flush();
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llvm_unreachable(str.c_str());
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}
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}
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return error_code::success();
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}
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PPCTargetHandler::PPCTargetHandler(PPCTargetInfo &targetInfo)
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: DefaultTargetHandler(targetInfo), _relocationHandler(targetInfo),
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_targetLayout(targetInfo) {
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}
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