1 //===-- RuntimeDyldELF.h - Run-time dynamic linker for MC-JIT ---*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // ELF support for MC-JIT runtime dynamic linker.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
15 #define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
16
17 #include "RuntimeDyldImpl.h"
18 #include "llvm/ADT/DenseMap.h"
19
20 using namespace llvm;
21
22 namespace llvm {
23 namespace {
24 // Helper for extensive error checking in debug builds.
Check(std::error_code Err)25 std::error_code Check(std::error_code Err) {
26 if (Err) {
27 report_fatal_error(Err.message());
28 }
29 return Err;
30 }
31
32 } // end anonymous namespace
33
34 class RuntimeDyldELF : public RuntimeDyldImpl {
35
36 void resolveRelocation(const SectionEntry &Section, uint64_t Offset,
37 uint64_t Value, uint32_t Type, int64_t Addend,
38 uint64_t SymOffset = 0);
39
40 void resolveX86_64Relocation(const SectionEntry &Section, uint64_t Offset,
41 uint64_t Value, uint32_t Type, int64_t Addend,
42 uint64_t SymOffset);
43
44 void resolveX86Relocation(const SectionEntry &Section, uint64_t Offset,
45 uint32_t Value, uint32_t Type, int32_t Addend);
46
47 void resolveAArch64Relocation(const SectionEntry &Section, uint64_t Offset,
48 uint64_t Value, uint32_t Type, int64_t Addend);
49
50 void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
51 uint32_t Value, uint32_t Type, int32_t Addend);
52
53 void resolveMIPSRelocation(const SectionEntry &Section, uint64_t Offset,
54 uint32_t Value, uint32_t Type, int32_t Addend);
55
56 void resolvePPC64Relocation(const SectionEntry &Section, uint64_t Offset,
57 uint64_t Value, uint32_t Type, int64_t Addend);
58
59 void resolveSystemZRelocation(const SectionEntry &Section, uint64_t Offset,
60 uint64_t Value, uint32_t Type, int64_t Addend);
61
getMaxStubSize()62 unsigned getMaxStubSize() override {
63 if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
64 return 20; // movz; movk; movk; movk; br
65 if (Arch == Triple::arm || Arch == Triple::thumb)
66 return 8; // 32-bit instruction and 32-bit address
67 else if (Arch == Triple::mipsel || Arch == Triple::mips)
68 return 16;
69 else if (Arch == Triple::ppc64 || Arch == Triple::ppc64le)
70 return 44;
71 else if (Arch == Triple::x86_64)
72 return 6; // 2-byte jmp instruction + 32-bit relative address
73 else if (Arch == Triple::systemz)
74 return 16;
75 else
76 return 0;
77 }
78
getStubAlignment()79 unsigned getStubAlignment() override {
80 if (Arch == Triple::systemz)
81 return 8;
82 else
83 return 1;
84 }
85
86 void findPPC64TOCSection(const ObjectFile &Obj,
87 ObjSectionToIDMap &LocalSections,
88 RelocationValueRef &Rel);
89 void findOPDEntrySection(const ObjectFile &Obj,
90 ObjSectionToIDMap &LocalSections,
91 RelocationValueRef &Rel);
92
93 uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
94 size_t getGOTEntrySize();
95
96 void updateGOTEntries(StringRef Name, uint64_t Addr) override;
97
98 // Relocation entries for symbols whose position-independent offset is
99 // updated in a global offset table.
100 typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
101 GOTRelocations GOTEntries; // List of entries requiring finalization.
102 SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
103
104 // When a module is loaded we save the SectionID of the EH frame section
105 // in a table until we receive a request to register all unregistered
106 // EH frame sections with the memory manager.
107 SmallVector<SID, 2> UnregisteredEHFrameSections;
108 SmallVector<SID, 2> RegisteredEHFrameSections;
109
110 public:
111 RuntimeDyldELF(RTDyldMemoryManager *mm);
112 virtual ~RuntimeDyldELF();
113
114 std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
115 loadObject(const object::ObjectFile &O) override;
116
117 void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
118 relocation_iterator
119 processRelocationRef(unsigned SectionID, relocation_iterator RelI,
120 const ObjectFile &Obj,
121 ObjSectionToIDMap &ObjSectionToID,
122 StubMap &Stubs) override;
123 bool isCompatibleFile(const object::ObjectFile &Obj) const override;
124 void registerEHFrames() override;
125 void deregisterEHFrames() override;
126 void finalizeLoad(const ObjectFile &Obj,
127 ObjSectionToIDMap &SectionMap) override;
128 };
129
130 } // end namespace llvm
131
132 #endif
133