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Revert "[llvm-objcopy] Add support for relocations"
This reverts r312643 because it's failing on llvm-i686-linux-RA. llvm-svn: 312645
This commit is contained in:
Petr Hosek
parent
c3ef22ce69
commit
3a78bfa9ca
@ -1,91 +0,0 @@
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# RUN: yaml2obj %s > %t
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# RUN: llvm-objcopy %t %t2
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# RUN: llvm-readobj -relocations %t2 | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x1000
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AddressAlign: 0x0000000000000010
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Content: "0000000000000000"
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- Name: .rel.text
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Type: SHT_REL
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Link: .symtab
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Info: .text
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Relocations:
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- Offset: 0x1000
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Symbol: foo
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Type: R_X86_64_PC32
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC ]
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Address: 0x2000
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AddressAlign: 0x0000000000000010
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Content: "0000000000000000"
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- Name: .rel.data
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Type: SHT_REL
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Link: .symtab
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Info: .data
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Relocations:
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- Offset: 0x2000
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Symbol: bar
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Type: R_X86_64_PC32
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- Name: .rela.data
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Type: SHT_RELA
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Link: .symtab
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Info: .data
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Relocations:
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- Offset: 0x2000
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Symbol: barA
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Type: R_X86_64_PC32
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Addend: 0x17
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- Name: .rela.text
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Type: SHT_RELA
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Link: .symtab
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Info: .text
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Relocations:
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- Offset: 0x1000
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Symbol: fooA
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Type: R_X86_64_PC32
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Addend: 0x13
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Symbols:
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Global:
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- Name: _start
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Type: STT_FUNC
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Section: .text
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Value: 0x1000
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Size: 4
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- Name: foo
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Type: STT_FUNC
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Size: 4
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- Name: fooA
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Type: STT_FUNC
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Size: 4
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- Name: bar
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Type: STT_OBJECT
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Size: 4
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- Name: barA
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Type: STT_OBJECT
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Size: 4
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# CHECK: Relocations [
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# CHECK-NEXT: Section (2) .rel.text {
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# CHECK-NEXT: 0x1000 R_X86_64_PC32 foo 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section (4) .rel.data {
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# CHECK-NEXT: 0x2000 R_X86_64_PC32 bar 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section (5) .rela.data {
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# CHECK-NEXT: 0x2000 R_X86_64_PC32 barA 0x17
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# CHECK-NEXT: }
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# CHECK-NEXT: Section (6) .rela.text {
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# CHECK-NEXT: 0x1000 R_X86_64_PC32 fooA 0x13
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# CHECK-NEXT: }
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# CHECK-NEXT:]
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@ -1,30 +0,0 @@
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# RUN: yaml2obj %s > %t
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# RUN: llvm-objcopy %t %t2
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# RUN: llvm-readobj -relocations %t2 | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_EXEC
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x1000
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AddressAlign: 0x0000000000000010
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Content: "0000000000000000"
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- Name: .rel.text
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Type: SHT_REL
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Link: .symtab
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Info: .text
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Relocations:
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- Offset: 0x1000
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Type: R_X86_64_RELATIVE
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# CHECK: Relocations [
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# CHECK-NEXT: Section (2) .rel.text {
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# CHECK-NEXT: 0x1000 R_X86_64_RELATIVE - 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT:]
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@ -154,39 +154,6 @@ void SymbolTableSectionImpl<ELFT>::writeSection(
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}
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}
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template <class ELFT> void RelocationSection<ELFT>::finalize() {
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this->Link = Symbols->Index;
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this->Info = SecToApplyRel->Index;
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}
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template <class ELFT>
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void setAddend(Elf_Rel_Impl<ELFT, false> &Rel, uint64_t Addend) {}
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template <class ELFT>
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void setAddend(Elf_Rel_Impl<ELFT, true> &Rela, uint64_t Addend) {
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Rela.r_addend = Addend;
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}
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template <class ELFT>
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template <class T>
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void RelocationSection<ELFT>::writeRel(T *Buf) const {
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for (const auto &Reloc : Relocations) {
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Buf->r_offset = Reloc.Offset;
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setAddend(*Buf, Reloc.Addend);
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Buf->setSymbolAndType(Reloc.Symbol->Index, Reloc.Type, false);
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++Buf;
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}
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}
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template <class ELFT>
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void RelocationSection<ELFT>::writeSection(llvm::FileOutputBuffer &Out) const {
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uint8_t *Buf = Out.getBufferStart() + Offset;
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if (Type == SHT_REL)
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writeRel(reinterpret_cast<Elf_Rel *>(Buf));
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else
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writeRel(reinterpret_cast<Elf_Rela *>(Buf));
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}
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// Returns true IFF a section is wholly inside the range of a segment
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static bool sectionWithinSegment(const SectionBase &Section,
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const Segment &Segment) {
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@ -263,36 +230,12 @@ void Object<ELFT>::initSymbolTable(const llvm::object::ELFFile<ELFT> &ElfFile,
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}
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}
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template <class ELFT>
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static void getAddend(uint64_t &ToSet, const Elf_Rel_Impl<ELFT, false> &Rel) {}
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template <class ELFT>
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static void getAddend(uint64_t &ToSet, const Elf_Rel_Impl<ELFT, true> &Rela) {
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ToSet = Rela.r_addend;
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}
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template <class ELFT, class T>
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void initRelocations(RelocationSection<ELFT> *Relocs,
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SymbolTableSection *SymbolTable, T RelRange) {
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for (const auto &Rel : RelRange) {
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Relocation ToAdd;
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ToAdd.Offset = Rel.r_offset;
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getAddend(ToAdd.Addend, Rel);
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ToAdd.Type = Rel.getType(false);
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ToAdd.Symbol = SymbolTable->getSymbolByIndex(Rel.getSymbol(false));
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Relocs->addRelocation(ToAdd);
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}
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}
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template <class ELFT>
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std::unique_ptr<SectionBase>
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Object<ELFT>::makeSection(const llvm::object::ELFFile<ELFT> &ElfFile,
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const Elf_Shdr &Shdr) {
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ArrayRef<uint8_t> Data;
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switch (Shdr.sh_type) {
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case SHT_REL:
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case SHT_RELA:
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return llvm::make_unique<RelocationSection<ELFT>>();
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case SHT_STRTAB:
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return llvm::make_unique<StringTableSection>();
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case SHT_SYMTAB: {
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@ -336,35 +279,6 @@ void Object<ELFT>::readSectionHeaders(const ELFFile<ELFT> &ElfFile) {
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// details about symbol tables.
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if (SymbolTable)
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initSymbolTable(ElfFile, SymbolTable);
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// Now that all sections and symbols have been added we can add
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// relocations that reference symbols and set the link and info fields for
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// relocation sections.
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for (auto &Section : Sections) {
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if (auto RelSec = dyn_cast<RelocationSection<ELFT>>(Section.get())) {
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if (RelSec->Link - 1 >= Sections.size() || RelSec->Link == 0) {
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error("Link field value " + Twine(RelSec->Link) + " in section " +
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RelSec->Name + " is invalid");
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}
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if (RelSec->Info - 1 >= Sections.size() || RelSec->Info == 0) {
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error("Info field value " + Twine(RelSec->Link) + " in section " +
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RelSec->Name + " is invalid");
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}
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auto SymTab =
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dyn_cast<SymbolTableSection>(Sections[RelSec->Link - 1].get());
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if (SymTab == nullptr) {
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error("Link field of relocation section " + RelSec->Name +
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" is not a symbol table");
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}
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RelSec->setSymTab(SymTab);
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RelSec->setSection(Sections[RelSec->Info - 1].get());
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auto Shdr = unwrapOrError(ElfFile.sections()).begin() + RelSec->Index;
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if (RelSec->Type == SHT_REL)
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initRelocations(RelSec, SymTab, unwrapOrError(ElfFile.rels(Shdr)));
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else
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initRelocations(RelSec, SymTab, unwrapOrError(ElfFile.relas(Shdr)));
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}
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}
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}
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template <class ELFT> Object<ELFT>::Object(const ELFObjectFile<ELFT> &Obj) {
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@ -146,35 +146,6 @@ template <class ELFT> class SymbolTableSectionImpl : public SymbolTableSection {
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void writeSection(llvm::FileOutputBuffer &Out) const override;
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};
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struct Relocation {
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const Symbol *Symbol;
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uint64_t Offset;
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uint64_t Addend;
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uint32_t Type;
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};
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template <class ELFT> class RelocationSection : public SectionBase {
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private:
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typedef typename ELFT::Rel Elf_Rel;
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typedef typename ELFT::Rela Elf_Rela;
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std::vector<Relocation> Relocations;
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SymbolTableSection *Symbols;
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SectionBase *SecToApplyRel;
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template <class T> void writeRel(T *Buf) const;
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public:
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void setSymTab(SymbolTableSection *StrTab) { Symbols = StrTab; }
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void setSection(SectionBase *Sec) { SecToApplyRel = Sec; }
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void addRelocation(Relocation Rel) { Relocations.push_back(Rel); }
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void finalize() override;
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void writeSection(llvm::FileOutputBuffer &Out) const override;
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static bool classof(const SectionBase *S) {
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return S->Type == llvm::ELF::SHT_REL || S->Type == llvm::ELF::SHT_RELA;
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}
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};
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template <class ELFT> class Object {
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private:
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typedef std::unique_ptr<SectionBase> SecPtr;
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