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Diffstat (limited to 'include/llvm/Object/ELFTypes.h')
| -rw-r--r-- | include/llvm/Object/ELFTypes.h | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/include/llvm/Object/ELFTypes.h b/include/llvm/Object/ELFTypes.h new file mode 100644 index 0000000000..84b603125a --- /dev/null +++ b/include/llvm/Object/ELFTypes.h @@ -0,0 +1,463 @@ +//===- ELFTypes.h - Endian specific types for ELF ---------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_OBJECT_ELF_TYPES_H +#define LLVM_OBJECT_ELF_TYPES_H + +#include "llvm/Support/AlignOf.h" +#include "llvm/Support/DataTypes.h" +#include "llvm/Support/ELF.h" +#include "llvm/Support/Endian.h" + +namespace llvm { +namespace object { + +using support::endianness; + +template <endianness target_endianness, std::size_t max_alignment, + bool is64Bits> +struct ELFType { + static const endianness TargetEndianness = target_endianness; + static const std::size_t MaxAlignment = max_alignment; + static const bool Is64Bits = is64Bits; +}; + +template <typename T, int max_align> struct MaximumAlignment { + enum { value = AlignOf<T>::Alignment > max_align ? max_align + : AlignOf<T>::Alignment + }; +}; + +// Templates to choose Elf_Addr and Elf_Off depending on is64Bits. +template <endianness target_endianness, std::size_t max_alignment> +struct ELFDataTypeTypedefHelperCommon { + typedef support::detail::packed_endian_specific_integral< + uint16_t, target_endianness, + MaximumAlignment<uint16_t, max_alignment>::value> Elf_Half; + typedef support::detail::packed_endian_specific_integral< + uint32_t, target_endianness, + MaximumAlignment<uint32_t, max_alignment>::value> Elf_Word; + typedef support::detail::packed_endian_specific_integral< + int32_t, target_endianness, + MaximumAlignment<int32_t, max_alignment>::value> Elf_Sword; + typedef support::detail::packed_endian_specific_integral< + uint64_t, target_endianness, + MaximumAlignment<uint64_t, max_alignment>::value> Elf_Xword; + typedef support::detail::packed_endian_specific_integral< + int64_t, target_endianness, + MaximumAlignment<int64_t, max_alignment>::value> Elf_Sxword; +}; + +template <class ELFT> struct ELFDataTypeTypedefHelper; + +/// ELF 32bit types. +template <endianness TargetEndianness, std::size_t MaxAlign> +struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, MaxAlign, false> > + : ELFDataTypeTypedefHelperCommon<TargetEndianness, MaxAlign> { + typedef uint32_t value_type; + typedef support::detail::packed_endian_specific_integral< + value_type, TargetEndianness, + MaximumAlignment<value_type, MaxAlign>::value> Elf_Addr; + typedef support::detail::packed_endian_specific_integral< + value_type, TargetEndianness, + MaximumAlignment<value_type, MaxAlign>::value> Elf_Off; +}; + +/// ELF 64bit types. +template <endianness TargetEndianness, std::size_t MaxAlign> +struct ELFDataTypeTypedefHelper<ELFType<TargetEndianness, MaxAlign, true> > + : ELFDataTypeTypedefHelperCommon<TargetEndianness, MaxAlign> { + typedef uint64_t value_type; + typedef support::detail::packed_endian_specific_integral< + value_type, TargetEndianness, + MaximumAlignment<value_type, MaxAlign>::value> Elf_Addr; + typedef support::detail::packed_endian_specific_integral< + value_type, TargetEndianness, + MaximumAlignment<value_type, MaxAlign>::value> Elf_Off; +}; + +// I really don't like doing this, but the alternative is copypasta. +#define LLVM_ELF_IMPORT_TYPES(E, M, W) \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Addr \ + Elf_Addr; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Off \ + Elf_Off; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Half \ + Elf_Half; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Word \ + Elf_Word; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Sword \ + Elf_Sword; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Xword \ + Elf_Xword; \ +typedef typename ELFDataTypeTypedefHelper<ELFType<E, M, W> >::Elf_Sxword \ + Elf_Sxword; + +#define LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) \ + LLVM_ELF_IMPORT_TYPES(ELFT::TargetEndianness, ELFT::MaxAlignment, \ + ELFT::Is64Bits) + +// Section header. +template <class ELFT> struct Elf_Shdr_Base; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Shdr_Base<ELFType<TargetEndianness, MaxAlign, false> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Word sh_name; // Section name (index into string table) + Elf_Word sh_type; // Section type (SHT_*) + Elf_Word sh_flags; // Section flags (SHF_*) + Elf_Addr sh_addr; // Address where section is to be loaded + Elf_Off sh_offset; // File offset of section data, in bytes + Elf_Word sh_size; // Size of section, in bytes + Elf_Word sh_link; // Section type-specific header table index link + Elf_Word sh_info; // Section type-specific extra information + Elf_Word sh_addralign; // Section address alignment + Elf_Word sh_entsize; // Size of records contained within the section +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Shdr_Base<ELFType<TargetEndianness, MaxAlign, true> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Word sh_name; // Section name (index into string table) + Elf_Word sh_type; // Section type (SHT_*) + Elf_Xword sh_flags; // Section flags (SHF_*) + Elf_Addr sh_addr; // Address where section is to be loaded + Elf_Off sh_offset; // File offset of section data, in bytes + Elf_Xword sh_size; // Size of section, in bytes + Elf_Word sh_link; // Section type-specific header table index link + Elf_Word sh_info; // Section type-specific extra information + Elf_Xword sh_addralign; // Section address alignment + Elf_Xword sh_entsize; // Size of records contained within the section +}; + +template <class ELFT> +struct Elf_Shdr_Impl : Elf_Shdr_Base<ELFT> { + using Elf_Shdr_Base<ELFT>::sh_entsize; + using Elf_Shdr_Base<ELFT>::sh_size; + + /// @brief Get the number of entities this section contains if it has any. + unsigned getEntityCount() const { + if (sh_entsize == 0) + return 0; + return sh_size / sh_entsize; + } +}; + +template <class ELFT> struct Elf_Sym_Base; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Sym_Base<ELFType<TargetEndianness, MaxAlign, false> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Word st_name; // Symbol name (index into string table) + Elf_Addr st_value; // Value or address associated with the symbol + Elf_Word st_size; // Size of the symbol + unsigned char st_info; // Symbol's type and binding attributes + unsigned char st_other; // Must be zero; reserved + Elf_Half st_shndx; // Which section (header table index) it's defined in +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Sym_Base<ELFType<TargetEndianness, MaxAlign, true> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Word st_name; // Symbol name (index into string table) + unsigned char st_info; // Symbol's type and binding attributes + unsigned char st_other; // Must be zero; reserved + Elf_Half st_shndx; // Which section (header table index) it's defined in + Elf_Addr st_value; // Value or address associated with the symbol + Elf_Xword st_size; // Size of the symbol +}; + +template <class ELFT> +struct Elf_Sym_Impl : Elf_Sym_Base<ELFT> { + using Elf_Sym_Base<ELFT>::st_info; + + // These accessors and mutators correspond to the ELF32_ST_BIND, + // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: + unsigned char getBinding() const { return st_info >> 4; } + unsigned char getType() const { return st_info & 0x0f; } + void setBinding(unsigned char b) { setBindingAndType(b, getType()); } + void setType(unsigned char t) { setBindingAndType(getBinding(), t); } + void setBindingAndType(unsigned char b, unsigned char t) { + st_info = (b << 4) + (t & 0x0f); + } +}; + +/// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section +/// (.gnu.version). This structure is identical for ELF32 and ELF64. +template <class ELFT> +struct Elf_Versym_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN) +}; + +template <class ELFT> struct Elf_Verdaux_Impl; + +/// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section +/// (.gnu.version_d). This structure is identical for ELF32 and ELF64. +template <class ELFT> +struct Elf_Verdef_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + typedef Elf_Verdaux_Impl<ELFT> Elf_Verdaux; + Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT) + Elf_Half vd_flags; // Bitwise flags (VER_DEF_*) + Elf_Half vd_ndx; // Version index, used in .gnu.version entries + Elf_Half vd_cnt; // Number of Verdaux entries + Elf_Word vd_hash; // Hash of name + Elf_Word vd_aux; // Offset to the first Verdaux entry (in bytes) + Elf_Word vd_next; // Offset to the next Verdef entry (in bytes) + + /// Get the first Verdaux entry for this Verdef. + const Elf_Verdaux *getAux() const { + return reinterpret_cast<const Elf_Verdaux *>((const char *)this + vd_aux); + } +}; + +/// Elf_Verdaux: This is the structure of auxiliary data in the SHT_GNU_verdef +/// section (.gnu.version_d). This structure is identical for ELF32 and ELF64. +template <class ELFT> +struct Elf_Verdaux_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + Elf_Word vda_name; // Version name (offset in string table) + Elf_Word vda_next; // Offset to next Verdaux entry (in bytes) +}; + +/// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed +/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. +template <class ELFT> +struct Elf_Verneed_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT) + Elf_Half vn_cnt; // Number of associated Vernaux entries + Elf_Word vn_file; // Library name (string table offset) + Elf_Word vn_aux; // Offset to first Vernaux entry (in bytes) + Elf_Word vn_next; // Offset to next Verneed entry (in bytes) +}; + +/// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed +/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64. +template <class ELFT> +struct Elf_Vernaux_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + Elf_Word vna_hash; // Hash of dependency name + Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*) + Elf_Half vna_other; // Version index, used in .gnu.version entries + Elf_Word vna_name; // Dependency name + Elf_Word vna_next; // Offset to next Vernaux entry (in bytes) +}; + +/// Elf_Dyn_Base: This structure matches the form of entries in the dynamic +/// table section (.dynamic) look like. +template <class ELFT> struct Elf_Dyn_Base; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Dyn_Base<ELFType<TargetEndianness, MaxAlign, false> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Sword d_tag; + union { + Elf_Word d_val; + Elf_Addr d_ptr; + } d_un; +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Dyn_Base<ELFType<TargetEndianness, MaxAlign, true> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Sxword d_tag; + union { + Elf_Xword d_val; + Elf_Addr d_ptr; + } d_un; +}; + +/// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters and setters. +template <class ELFT> +struct Elf_Dyn_Impl : Elf_Dyn_Base<ELFT> { + using Elf_Dyn_Base<ELFT>::d_tag; + using Elf_Dyn_Base<ELFT>::d_un; + int64_t getTag() const { return d_tag; } + uint64_t getVal() const { return d_un.d_val; } + uint64_t getPtr() const { return d_un.ptr; } +}; + +// Elf_Rel: Elf Relocation +template <class ELFT, bool isRela> struct Elf_Rel_Base; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, false>, false> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Word r_info; // Symbol table index and type of relocation to apply + + uint32_t getRInfo(bool isMips64EL) const { + assert(!isMips64EL); + return r_info; + } + void setRInfo(uint32_t R) { r_info = R; } +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, true>, false> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Xword r_info; // Symbol table index and type of relocation to apply + + uint64_t getRInfo(bool isMips64EL) const { + uint64_t t = r_info; + if (!isMips64EL) + return t; + // Mips64 little endian has a "special" encoding of r_info. Instead of one + // 64 bit little endian number, it is a little endian 32 bit number followed + // by a 32 bit big endian number. + return (t << 32) | ((t >> 8) & 0xff000000) | ((t >> 24) & 0x00ff0000) | + ((t >> 40) & 0x0000ff00) | ((t >> 56) & 0x000000ff); + } + void setRInfo(uint64_t R) { + // FIXME: Add mips64el support. + r_info = R; + } +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, false>, true> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Word r_info; // Symbol table index and type of relocation to apply + Elf_Sword r_addend; // Compute value for relocatable field by adding this + + uint32_t getRInfo(bool isMips64EL) const { + assert(!isMips64EL); + return r_info; + } + void setRInfo(uint32_t R) { r_info = R; } +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Rel_Base<ELFType<TargetEndianness, MaxAlign, true>, true> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Addr r_offset; // Location (file byte offset, or program virtual addr) + Elf_Xword r_info; // Symbol table index and type of relocation to apply + Elf_Sxword r_addend; // Compute value for relocatable field by adding this. + + uint64_t getRInfo(bool isMips64EL) const { + // Mips64 little endian has a "special" encoding of r_info. Instead of one + // 64 bit little endian number, it is a little endian 32 bit number followed + // by a 32 bit big endian number. + uint64_t t = r_info; + if (!isMips64EL) + return t; + return (t << 32) | ((t >> 8) & 0xff000000) | ((t >> 24) & 0x00ff0000) | + ((t >> 40) & 0x0000ff00) | ((t >> 56) & 0x000000ff); + } + void setRInfo(uint64_t R) { + // FIXME: Add mips64el support. + r_info = R; + } +}; + +template <class ELFT, bool isRela> struct Elf_Rel_Impl; + +template <endianness TargetEndianness, std::size_t MaxAlign, bool isRela> +struct Elf_Rel_Impl<ELFType<TargetEndianness, MaxAlign, true>, + isRela> : Elf_Rel_Base< + ELFType<TargetEndianness, MaxAlign, true>, isRela> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + + // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, + // and ELF64_R_INFO macros defined in the ELF specification: + uint32_t getSymbol(bool isMips64EL) const { + return (uint32_t)(this->getRInfo(isMips64EL) >> 32); + } + uint32_t getType(bool isMips64EL) const { + return (uint32_t)(this->getRInfo(isMips64EL) & 0xffffffffL); + } + void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } + void setType(uint32_t t) { setSymbolAndType(getSymbol(), t); } + void setSymbolAndType(uint32_t s, uint32_t t) { + this->setRInfo(((uint64_t)s << 32) + (t & 0xffffffffL)); + } +}; + +template <endianness TargetEndianness, std::size_t MaxAlign, bool isRela> +struct Elf_Rel_Impl<ELFType<TargetEndianness, MaxAlign, false>, + isRela> : Elf_Rel_Base< + ELFType<TargetEndianness, MaxAlign, false>, isRela> { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + + // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, + // and ELF32_R_INFO macros defined in the ELF specification: + uint32_t getSymbol(bool isMips64EL) const { + return this->getRInfo(isMips64EL) >> 8; + } + unsigned char getType(bool isMips64EL) const { + return (unsigned char)(this->getRInfo(isMips64EL) & 0x0ff); + } + void setSymbol(uint32_t s) { setSymbolAndType(s, getType()); } + void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } + void setSymbolAndType(uint32_t s, unsigned char t) { + this->setRInfo((s << 8) + t); + } +}; + +template <class ELFT> +struct Elf_Ehdr_Impl { + LLVM_ELF_IMPORT_TYPES_ELFT(ELFT) + unsigned char e_ident[ELF::EI_NIDENT]; // ELF Identification bytes + Elf_Half e_type; // Type of file (see ET_*) + Elf_Half e_machine; // Required architecture for this file (see EM_*) + Elf_Word e_version; // Must be equal to 1 + Elf_Addr e_entry; // Address to jump to in order to start program + Elf_Off e_phoff; // Program header table's file offset, in bytes + Elf_Off e_shoff; // Section header table's file offset, in bytes + Elf_Word e_flags; // Processor-specific flags + Elf_Half e_ehsize; // Size of ELF header, in bytes + Elf_Half e_phentsize; // Size of an entry in the program header table + Elf_Half e_phnum; // Number of entries in the program header table + Elf_Half e_shentsize; // Size of an entry in the section header table + Elf_Half e_shnum; // Number of entries in the section header table + Elf_Half e_shstrndx; // Section header table index of section name + // string table + bool checkMagic() const { + return (memcmp(e_ident, ELF::ElfMagic, strlen(ELF::ElfMagic))) == 0; + } + unsigned char getFileClass() const { return e_ident[ELF::EI_CLASS]; } + unsigned char getDataEncoding() const { return e_ident[ELF::EI_DATA]; } +}; + +template <class ELFT> struct Elf_Phdr_Impl; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Phdr_Impl<ELFType<TargetEndianness, MaxAlign, false> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, false) + Elf_Word p_type; // Type of segment + Elf_Off p_offset; // FileOffset where segment is located, in bytes + Elf_Addr p_vaddr; // Virtual Address of beginning of segment + Elf_Addr p_paddr; // Physical address of beginning of segment (OS-specific) + Elf_Word p_filesz; // Num. of bytes in file image of segment (may be zero) + Elf_Word p_memsz; // Num. of bytes in mem image of segment (may be zero) + Elf_Word p_flags; // Segment flags + Elf_Word p_align; // Segment alignment constraint +}; + +template <endianness TargetEndianness, std::size_t MaxAlign> +struct Elf_Phdr_Impl<ELFType<TargetEndianness, MaxAlign, true> > { + LLVM_ELF_IMPORT_TYPES(TargetEndianness, MaxAlign, true) + Elf_Word p_type; // Type of segment + Elf_Word p_flags; // Segment flags + Elf_Off p_offset; // FileOffset where segment is located, in bytes + Elf_Addr p_vaddr; // Virtual Address of beginning of segment + Elf_Addr p_paddr; // Physical address of beginning of segment (OS-specific) + Elf_Xword p_filesz; // Num. of bytes in file image of segment (may be zero) + Elf_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero) + Elf_Xword p_align; // Segment alignment constraint +}; + +} // end namespace object. +} // end namespace llvm. + +#endif |