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228 lines
8.2 KiB
C++
228 lines
8.2 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 the Tool
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// Interface Standard (TIS) Executable and Linking Format (ELF) Specification
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// Version 1.2, May 1995. The ELF64 is based on HP/Intel definition of the
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// ELF-64 object file format document, Version 1.5 Draft 2 May 27, 1998
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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/BinaryObject.h"
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#include "llvm/CodeGen/MachineRelocation.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/System/DataTypes.h"
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namespace llvm {
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class GlobalValue;
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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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// ELF symbols are related to llvm ones by being one of the two llvm
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// types, for the other ones (section, file, func) a null pointer is
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// assumed by default.
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union {
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const GlobalValue *GV; // If this is a pointer to a GV
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const char *Ext; // If this is a pointer to a named symbol
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} Source;
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// Describes from which source type this ELF symbol comes from,
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// they can be GlobalValue, ExternalSymbol or neither.
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enum {
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isGV, // The Source.GV field is valid.
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isExtSym, // The Source.ExtSym field is valid.
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isOther // Not a GlobalValue or External Symbol
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};
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unsigned SourceType;
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bool isGlobalValue() const { return SourceType == isGV; }
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bool isExternalSym() const { return SourceType == isExtSym; }
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// getGlobalValue - If this is a global value which originated the
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// elf symbol, return a reference to it.
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const GlobalValue *getGlobalValue() const {
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assert(SourceType == isGV && "This is not a global value");
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return Source.GV;
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}
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// getExternalSym - If this is an external symbol which originated the
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// elf symbol, return a reference to it.
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const char *getExternalSymbol() const {
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assert(SourceType == isExtSym && "This is not an external symbol");
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return Source.Ext;
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}
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// getGV - From a global value return a elf symbol to represent it
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static ELFSym *getGV(const GlobalValue *GV, unsigned Bind,
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unsigned Type, unsigned Visibility) {
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ELFSym *Sym = new ELFSym();
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Sym->Source.GV = GV;
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Sym->setBind(Bind);
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Sym->setType(Type);
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Sym->setVisibility(Visibility);
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Sym->SourceType = isGV;
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return Sym;
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}
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// getExtSym - Create and return an elf symbol to represent an
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// external symbol
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static ELFSym *getExtSym(const char *Ext) {
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ELFSym *Sym = new ELFSym();
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Sym->Source.Ext = Ext;
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Sym->setBind(ELF::STB_GLOBAL);
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Sym->setType(ELF::STT_NOTYPE);
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Sym->setVisibility(ELF::STV_DEFAULT);
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Sym->SourceType = isExtSym;
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return Sym;
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}
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// getSectionSym - Returns a elf symbol to represent an elf section
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static ELFSym *getSectionSym() {
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ELFSym *Sym = new ELFSym();
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Sym->setBind(ELF::STB_LOCAL);
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Sym->setType(ELF::STT_SECTION);
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Sym->setVisibility(ELF::STV_DEFAULT);
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Sym->SourceType = isOther;
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return Sym;
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}
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// getFileSym - Returns a elf symbol to represent the module identifier
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static ELFSym *getFileSym() {
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ELFSym *Sym = new ELFSym();
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Sym->setBind(ELF::STB_LOCAL);
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Sym->setType(ELF::STT_FILE);
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Sym->setVisibility(ELF::STV_DEFAULT);
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Sym->SectionIdx = 0xfff1; // ELFSection::SHN_ABS;
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Sym->SourceType = isOther;
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return Sym;
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}
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// getUndefGV - Returns a STT_NOTYPE symbol
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static ELFSym *getUndefGV(const GlobalValue *GV, unsigned Bind) {
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ELFSym *Sym = new ELFSym();
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Sym->Source.GV = GV;
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Sym->setBind(Bind);
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Sym->setType(ELF::STT_NOTYPE);
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Sym->setVisibility(ELF::STV_DEFAULT);
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Sym->SectionIdx = 0; //ELFSection::SHN_UNDEF;
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Sym->SourceType = isGV;
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return Sym;
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}
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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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// Symbol index into the Symbol table
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unsigned SymTabIdx;
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ELFSym() : SourceType(isOther), NameIdx(0), Value(0),
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Size(0), Info(0), Other(ELF::STV_DEFAULT), SectionIdx(0),
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SymTabIdx(0) {}
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unsigned getBind() const { return (Info >> 4) & 0xf; }
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unsigned getType() const { return Info & 0xf; }
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bool isLocalBind() const { return getBind() == ELF::STB_LOCAL; }
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bool isFileType() const { return getType() == ELF::STT_FILE; }
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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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void setVisibility(unsigned V) {
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assert(V == (V & 0x3) && "Visibility value out of range!");
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Other = V;
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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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class ELFSection : public BinaryObject {
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public:
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// ELF specific fields
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unsigned NameIdx; // sh_name - .shstrtab idx of name, once emitted.
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unsigned Type; // sh_type - Section contents & semantics
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unsigned Flags; // sh_flags - Section flags.
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uint64_t Addr; // sh_addr - The mem addr this section is in.
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unsigned Offset; // sh_offset - Offset from the file start
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unsigned Size; // sh_size - The section size.
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unsigned Link; // sh_link - Section header table index link.
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unsigned Info; // sh_info - Auxillary information.
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unsigned Align; // sh_addralign - Alignment of section.
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unsigned EntSize; // sh_entsize - Size of entries in the section e
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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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/// Sym - The symbol to represent this section if it has one.
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ELFSym *Sym;
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/// getSymIndex - Returns the symbol table index of the symbol
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/// representing this section.
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unsigned getSymbolTableIndex() const {
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assert(Sym && "section not present in the symbol table");
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return Sym->SymTabIdx;
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}
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ELFSection(const std::string &name, bool isLittleEndian, bool is64Bit)
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: BinaryObject(name, isLittleEndian, is64Bit), Type(0), Flags(0), Addr(0),
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Offset(0), Size(0), Link(0), Info(0), Align(0), EntSize(0), Sym(0) {}
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};
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/// ELFRelocation - This class contains all the information necessary to
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/// to generate any 32-bit or 64-bit ELF relocation entry.
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class ELFRelocation {
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uint64_t r_offset; // offset in the section of the object this applies to
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uint32_t r_symidx; // symbol table index of the symbol to use
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uint32_t r_type; // machine specific relocation type
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int64_t r_add; // explicit relocation addend
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bool r_rela; // if true then the addend is part of the entry
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// otherwise the addend is at the location specified
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// by r_offset
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public:
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uint64_t getInfo(bool is64Bit) const {
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if (is64Bit)
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return ((uint64_t)r_symidx << 32) + ((uint64_t)r_type & 0xFFFFFFFFL);
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else
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return (r_symidx << 8) + (r_type & 0xFFL);
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}
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uint64_t getOffset() const { return r_offset; }
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int64_t getAddend() const { return r_add; }
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ELFRelocation(uint64_t off, uint32_t sym, uint32_t type,
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bool rela = true, int64_t addend = 0) :
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r_offset(off), r_symidx(sym), r_type(type),
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r_add(addend), r_rela(rela) {}
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};
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} // end namespace llvm
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#endif
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