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
19 namespace mcld {
20
MipsELFDynamic(const MipsGNULDBackend & pParent,const LinkerConfig & pConfig)21 MipsELFDynamic::MipsELFDynamic(const MipsGNULDBackend& pParent,
22 const LinkerConfig& pConfig)
23 : ELFDynamic(pParent, pConfig), m_pParent(pParent), m_pConfig(pConfig) {
24 }
25
reserveTargetEntries(const ELFFileFormat & pFormat)26 void 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
applyTargetEntries(const ELFFileFormat & pFormat)41 void 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
getSymTabNum(const ELFFileFormat & pFormat) const56 size_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
getGotSym(const ELFFileFormat & pFormat) const64 size_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
getLocalGotNum(const ELFFileFormat & pFormat) const71 size_t MipsELFDynamic::getLocalGotNum(const ELFFileFormat& pFormat) const {
72 if (!pFormat.hasGOT())
73 return 0;
74
75 return m_pParent.getGOT().getLocalNum();
76 }
77
getBaseAddress()78 uint64_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