MipsELFDynamic.cpp revision f7ac0f19a1c8d0ad14bcf6456ce368b830fea886 
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 "MipsELFDynamic.h"
10
11#include "MipsLDBackend.h"
12#include <mcld/LD/ELFFileFormat.h>
13#include <mcld/Target/GNULDBackend.h>
14
15using namespace mcld;
16
17// MIPS mandatory dynamic section entries
18enum {
19  MIPS_RLD_VERSION  = 0x70000001,
20  MIPS_FLAGS        = 0x70000005,
21  MIPS_BASE_ADDRESS = 0x70000006,
22  MIPS_LOCAL_GOTNO  = 0x7000000a,
23  MIPS_SYMTABNO     = 0x70000011,
24  MIPS_GOTSYM       = 0x70000013
25};
26
27MipsELFDynamic::MipsELFDynamic(const MipsGNULDBackend& pParent,
28                               const LinkerConfig& pConfig)
29  : ELFDynamic(pParent, pConfig),
30    m_pParent(pParent)
31{
32}
33
34MipsELFDynamic::~MipsELFDynamic()
35{
36}
37
38void MipsELFDynamic::reserveTargetEntries(const ELFFileFormat& pFormat)
39{
40  // reservePLTGOT
41  if (pFormat.hasGOT())
42    reserveOne(llvm::ELF::DT_PLTGOT);
43
44  reserveOne(MIPS_RLD_VERSION);
45  reserveOne(MIPS_FLAGS);
46  reserveOne(MIPS_BASE_ADDRESS);
47  reserveOne(MIPS_LOCAL_GOTNO);
48  reserveOne(MIPS_SYMTABNO);
49  reserveOne(MIPS_GOTSYM);
50}
51
52void MipsELFDynamic::applyTargetEntries(const ELFFileFormat& pFormat)
53{
54  // applyPLTGOT
55  if (pFormat.hasGOT())
56    applyOne(llvm::ELF::DT_PLTGOT, pFormat.getGOT().addr());
57
58  applyOne(MIPS_RLD_VERSION, 1);
59  applyOne(MIPS_FLAGS, 0);
60  applyOne(MIPS_BASE_ADDRESS, 0);
61  applyOne(MIPS_LOCAL_GOTNO, getLocalGotNum(pFormat));
62  applyOne(MIPS_SYMTABNO, getSymTabNum(pFormat));
63  applyOne(MIPS_GOTSYM, getGotSym(pFormat));
64}
65
66size_t MipsELFDynamic::getSymTabNum(const ELFFileFormat& pFormat) const
67{
68  if (!pFormat.hasDynSymTab())
69    return 0;
70
71  const LDSection& dynsym = pFormat.getDynSymTab();
72  return dynsym.size() / symbolSize();
73}
74
75size_t MipsELFDynamic::getGotSym(const ELFFileFormat& pFormat) const
76{
77  if (!pFormat.hasGOT())
78    return 0;
79
80  return getSymTabNum(pFormat) - m_pParent.getGOT().getGlobalNum();
81}
82
83size_t MipsELFDynamic::getLocalGotNum(const ELFFileFormat& pFormat) const
84{
85  if (!pFormat.hasGOT())
86    return 0;
87
88  return m_pParent.getGOT().getLocalNum();
89}
90