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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73039 91177308-0d34-0410-b5e6-96231b3b80d8
227 lines
7.5 KiB
C++
227 lines
7.5 KiB
C++
//===-- lib/CodeGen/ELF.h - ELF constants and data structures ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header contains common, non-processor-specific data structures and
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// constants for the ELF file format.
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//
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// The details of the ELF32 bits in this file are largely based on
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// the Tool Interface Standard (TIS) Executable and Linking Format
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// (ELF) Specification Version 1.2, May 1995. The ELF64 stuff is not
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// standardized, as far as I can tell. It was largely based on information
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// I found in OpenBSD header files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CODEGEN_ELF_H
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#define CODEGEN_ELF_H
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#include "llvm/CodeGen/MachineRelocation.h"
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#include "llvm/Support/DataTypes.h"
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#include <cstring>
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namespace llvm {
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class GlobalVariable;
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// Identification Indexes
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enum {
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EI_MAG0 = 0,
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EI_MAG1 = 1,
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EI_MAG2 = 2,
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EI_MAG3 = 3
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};
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// File types
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enum {
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ET_NONE = 0, // No file type
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ET_REL = 1, // Relocatable file
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ET_EXEC = 2, // Executable file
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ET_DYN = 3, // Shared object file
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ET_CORE = 4, // Core file
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ET_LOPROC = 0xff00, // Beginning of processor-specific codes
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ET_HIPROC = 0xffff // Processor-specific
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};
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// Object file classes.
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enum {
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ELFCLASS32 = 1, // 32-bit object file
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ELFCLASS64 = 2 // 64-bit object file
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};
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// Object file byte orderings.
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enum {
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ELFDATA2LSB = 1, // Little-endian object file
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ELFDATA2MSB = 2 // Big-endian object file
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};
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// Versioning
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enum {
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EV_NONE = 0,
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EV_CURRENT = 1
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};
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struct ELFHeader {
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// e_machine - This field is the target specific value to emit as the
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// e_machine member of the ELF header.
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unsigned short e_machine;
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// e_flags - The machine flags for the target. This defaults to zero.
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unsigned e_flags;
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// e_size - Holds the ELF header's size in bytes
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unsigned e_ehsize;
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// Endianess and ELF Class (64 or 32 bits)
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unsigned ByteOrder;
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unsigned ElfClass;
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unsigned getByteOrder() const { return ByteOrder; }
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unsigned getElfClass() const { return ElfClass; }
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unsigned getSize() const { return e_ehsize; }
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unsigned getMachine() const { return e_machine; }
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unsigned getFlags() const { return e_flags; }
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ELFHeader(unsigned short machine, unsigned flags,
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bool is64Bit, bool isLittleEndian)
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: e_machine(machine), e_flags(flags) {
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ElfClass = is64Bit ? ELFCLASS64 : ELFCLASS32;
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ByteOrder = isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB;
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e_ehsize = is64Bit ? 64 : 52;
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}
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};
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/// ELFSection - This struct contains information about each section that is
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/// emitted to the file. This is eventually turned into the section header
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/// table at the end of the file.
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struct ELFSection {
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// ELF specific fields
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std::string Name; // Name of the section.
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unsigned NameIdx; // Index in .shstrtab of name, once emitted.
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unsigned Type;
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unsigned Flags;
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uint64_t Addr;
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unsigned Offset;
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unsigned Size;
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unsigned Link;
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unsigned Info;
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unsigned Align;
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unsigned EntSize;
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// Section Header Flags
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enum {
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SHF_WRITE = 1 << 0, // Writable
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SHF_ALLOC = 1 << 1, // Mapped into the process addr space
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SHF_EXECINSTR = 1 << 2, // Executable
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SHF_MERGE = 1 << 4, // Might be merged if equal
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SHF_STRINGS = 1 << 5, // Contains null-terminated strings
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SHF_INFO_LINK = 1 << 6, // 'sh_info' contains SHT index
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SHF_LINK_ORDER = 1 << 7, // Preserve order after combining
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SHF_OS_NONCONFORMING = 1 << 8, // nonstandard OS support required
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SHF_GROUP = 1 << 9, // Section is a member of a group
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SHF_TLS = 1 << 10 // Section holds thread-local data
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};
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// Section Types
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enum {
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SHT_NULL = 0, // No associated section (inactive entry).
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SHT_PROGBITS = 1, // Program-defined contents.
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SHT_SYMTAB = 2, // Symbol table.
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SHT_STRTAB = 3, // String table.
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SHT_RELA = 4, // Relocation entries; explicit addends.
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SHT_HASH = 5, // Symbol hash table.
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SHT_DYNAMIC = 6, // Information for dynamic linking.
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SHT_NOTE = 7, // Information about the file.
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SHT_NOBITS = 8, // Data occupies no space in the file.
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SHT_REL = 9, // Relocation entries; no explicit addends.
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SHT_SHLIB = 10, // Reserved.
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SHT_DYNSYM = 11, // Symbol table.
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SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
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SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
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SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
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SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
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};
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// Special section indices.
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enum {
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SHN_UNDEF = 0, // Undefined, missing, irrelevant
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SHN_LORESERVE = 0xff00, // Lowest reserved index
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SHN_LOPROC = 0xff00, // Lowest processor-specific index
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SHN_HIPROC = 0xff1f, // Highest processor-specific index
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SHN_ABS = 0xfff1, // Symbol has absolute value; no relocation
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SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
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SHN_HIRESERVE = 0xffff // Highest reserved index
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};
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/// SectionIdx - The number of the section in the Section Table.
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unsigned short SectionIdx;
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/// SectionData - The actual data for this section which we are building
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/// up for emission to the file.
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std::vector<unsigned char> SectionData;
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/// Relocations - The relocations that we have encountered so far in this
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/// section that we will need to convert to MachORelocation entries when
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/// the file is written.
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std::vector<MachineRelocation> Relocations;
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/// Section Header Size
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static unsigned getSectionHdrSize(bool is64Bit)
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{ return is64Bit ? 64 : 40; }
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ELFSection(const std::string &name)
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: Name(name), Type(0), Flags(0), Addr(0), Offset(0), Size(0),
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Link(0), Info(0), Align(0), EntSize(0) {}
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};
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/// ELFSym - This struct contains information about each symbol that is
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/// added to logical symbol table for the module. This is eventually
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/// turned into a real symbol table in the file.
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struct ELFSym {
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const GlobalValue *GV; // The global value this corresponds to.
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// ELF specific fields
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unsigned NameIdx; // Index in .strtab of name, once emitted.
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uint64_t Value;
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unsigned Size;
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uint8_t Info;
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uint8_t Other;
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unsigned short SectionIdx;
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enum {
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STB_LOCAL = 0,
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STB_GLOBAL = 1,
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STB_WEAK = 2
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};
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enum {
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STT_NOTYPE = 0,
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STT_OBJECT = 1,
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STT_FUNC = 2,
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STT_SECTION = 3,
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STT_FILE = 4
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};
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ELFSym(const GlobalValue *gv) : GV(gv), NameIdx(0), Value(0),
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Size(0), Info(0), Other(0),
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SectionIdx(ELFSection::SHN_UNDEF) {}
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void SetBind(unsigned X) {
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assert(X == (X & 0xF) && "Bind value out of range!");
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Info = (Info & 0x0F) | (X << 4);
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}
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void SetType(unsigned X) {
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assert(X == (X & 0xF) && "Type value out of range!");
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Info = (Info & 0xF0) | X;
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}
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};
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} // end namespace llvm
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#endif
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