1//===- MipsELFDynamic.cpp -------------------------------------------------===//
2//
3//                     The MCLinker Project
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9#include "mcld/LinkerConfig.h"
10#include "mcld/LD/ELFFileFormat.h"
11#include "mcld/LD/ELFSegment.h"
12#include "mcld/LD/ELFSegmentFactory.h"
13#include "mcld/Target/GNULDBackend.h"
14#include "MipsELFDynamic.h"
15#include "MipsLDBackend.h"
16
17#include <llvm/Support/ELF.h>
18
19namespace mcld {
20
21MipsELFDynamic::MipsELFDynamic(const MipsGNULDBackend& pParent,
22                               const LinkerConfig& pConfig)
23    : ELFDynamic(pParent, pConfig), m_pParent(pParent), m_pConfig(pConfig) {
24}
25
26void MipsELFDynamic::reserveTargetEntries(const ELFFileFormat& pFormat) {
27  if (pFormat.hasGOT())
28    reserveOne(llvm::ELF::DT_PLTGOT);
29
30  reserveOne(llvm::ELF::DT_MIPS_RLD_VERSION);
31  reserveOne(llvm::ELF::DT_MIPS_FLAGS);
32  reserveOne(llvm::ELF::DT_MIPS_BASE_ADDRESS);
33  reserveOne(llvm::ELF::DT_MIPS_LOCAL_GOTNO);
34  reserveOne(llvm::ELF::DT_MIPS_SYMTABNO);
35  reserveOne(llvm::ELF::DT_MIPS_GOTSYM);
36
37  if (pFormat.hasGOTPLT())
38    reserveOne(llvm::ELF::DT_MIPS_PLTGOT);
39}
40
41void MipsELFDynamic::applyTargetEntries(const ELFFileFormat& pFormat) {
42  if (pFormat.hasGOT())
43    applyOne(llvm::ELF::DT_PLTGOT, pFormat.getGOT().addr());
44
45  applyOne(llvm::ELF::DT_MIPS_RLD_VERSION, 1);
46  applyOne(llvm::ELF::DT_MIPS_FLAGS, llvm::ELF::RHF_NOTPOT);
47  applyOne(llvm::ELF::DT_MIPS_BASE_ADDRESS, getBaseAddress());
48  applyOne(llvm::ELF::DT_MIPS_LOCAL_GOTNO, getLocalGotNum(pFormat));
49  applyOne(llvm::ELF::DT_MIPS_SYMTABNO, getSymTabNum(pFormat));
50  applyOne(llvm::ELF::DT_MIPS_GOTSYM, getGotSym(pFormat));
51
52  if (pFormat.hasGOTPLT())
53    applyOne(llvm::ELF::DT_MIPS_PLTGOT, pFormat.getGOTPLT().addr());
54}
55
56size_t MipsELFDynamic::getSymTabNum(const ELFFileFormat& pFormat) const {
57  if (!pFormat.hasDynSymTab())
58    return 0;
59
60  const LDSection& dynsym = pFormat.getDynSymTab();
61  return dynsym.size() / symbolSize();
62}
63
64size_t MipsELFDynamic::getGotSym(const ELFFileFormat& pFormat) const {
65  if (!pFormat.hasGOT())
66    return 0;
67
68  return getSymTabNum(pFormat) - m_pParent.getGOT().getGlobalNum();
69}
70
71size_t MipsELFDynamic::getLocalGotNum(const ELFFileFormat& pFormat) const {
72  if (!pFormat.hasGOT())
73    return 0;
74
75  return m_pParent.getGOT().getLocalNum();
76}
77
78uint64_t MipsELFDynamic::getBaseAddress() {
79  if (LinkerConfig::Exec != m_pConfig.codeGenType())
80    return 0;
81
82  ELFSegmentFactory::const_iterator baseSeg =
83      m_pParent.elfSegmentTable().find(llvm::ELF::PT_LOAD, 0x0, 0x0);
84
85  return m_pParent.elfSegmentTable().end() == baseSeg ? 0 : (*baseSeg)->vaddr();
86}
87
88}  // namespace mcld
89