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-//===-- lib/CodeGen/ELF.h - ELF constants and data structures ---*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This header contains common, non-processor-specific data structures and
-// constants for the ELF file format.
-//
-// The details of the ELF32 bits in this file are largely based on the Tool
-// Interface Standard (TIS) Executable and Linking Format (ELF) Specification
-// Version 1.2, May 1995. The ELF64 is based on HP/Intel definition of the
-// ELF-64 object file format document, Version 1.5 Draft 2 May 27, 1998
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef CODEGEN_ELF_H
-#define CODEGEN_ELF_H
-
-#include "llvm/CodeGen/BinaryObject.h"
-#include "llvm/CodeGen/MachineRelocation.h"
-#include "llvm/Support/ELF.h"
-#include "llvm/Support/DataTypes.h"
-
-namespace llvm {
- class GlobalValue;
-
- /// ELFSym - This struct contains information about each symbol that is
- /// added to logical symbol table for the module. This is eventually
- /// turned into a real symbol table in the file.
- struct ELFSym {
-
- // ELF symbols are related to llvm ones by being one of the two llvm
- // types, for the other ones (section, file, func) a null pointer is
- // assumed by default.
- union {
- const GlobalValue *GV; // If this is a pointer to a GV
- const char *Ext; // If this is a pointer to a named symbol
- } Source;
-
- // Describes from which source type this ELF symbol comes from,
- // they can be GlobalValue, ExternalSymbol or neither.
- enum {
- isGV, // The Source.GV field is valid.
- isExtSym, // The Source.ExtSym field is valid.
- isOther // Not a GlobalValue or External Symbol
- };
- unsigned SourceType;
-
- bool isGlobalValue() const { return SourceType == isGV; }
- bool isExternalSym() const { return SourceType == isExtSym; }
-
- // getGlobalValue - If this is a global value which originated the
- // elf symbol, return a reference to it.
- const GlobalValue *getGlobalValue() const {
- assert(SourceType == isGV && "This is not a global value");
- return Source.GV;
- }
-
- // getExternalSym - If this is an external symbol which originated the
- // elf symbol, return a reference to it.
- const char *getExternalSymbol() const {
- assert(SourceType == isExtSym && "This is not an external symbol");
- return Source.Ext;
- }
-
- // getGV - From a global value return a elf symbol to represent it
- static ELFSym *getGV(const GlobalValue *GV, unsigned Bind,
- unsigned Type, unsigned Visibility) {
- ELFSym *Sym = new ELFSym();
- Sym->Source.GV = GV;
- Sym->setBind(Bind);
- Sym->setType(Type);
- Sym->setVisibility(Visibility);
- Sym->SourceType = isGV;
- return Sym;
- }
-
- // getExtSym - Create and return an elf symbol to represent an
- // external symbol
- static ELFSym *getExtSym(const char *Ext) {
- ELFSym *Sym = new ELFSym();
- Sym->Source.Ext = Ext;
- Sym->setBind(ELF::STB_GLOBAL);
- Sym->setType(ELF::STT_NOTYPE);
- Sym->setVisibility(ELF::STV_DEFAULT);
- Sym->SourceType = isExtSym;
- return Sym;
- }
-
- // getSectionSym - Returns a elf symbol to represent an elf section
- static ELFSym *getSectionSym() {
- ELFSym *Sym = new ELFSym();
- Sym->setBind(ELF::STB_LOCAL);
- Sym->setType(ELF::STT_SECTION);
- Sym->setVisibility(ELF::STV_DEFAULT);
- Sym->SourceType = isOther;
- return Sym;
- }
-
- // getFileSym - Returns a elf symbol to represent the module identifier
- static ELFSym *getFileSym() {
- ELFSym *Sym = new ELFSym();
- Sym->setBind(ELF::STB_LOCAL);
- Sym->setType(ELF::STT_FILE);
- Sym->setVisibility(ELF::STV_DEFAULT);
- Sym->SectionIdx = 0xfff1; // ELFSection::SHN_ABS;
- Sym->SourceType = isOther;
- return Sym;
- }
-
- // getUndefGV - Returns a STT_NOTYPE symbol
- static ELFSym *getUndefGV(const GlobalValue *GV, unsigned Bind) {
- ELFSym *Sym = new ELFSym();
- Sym->Source.GV = GV;
- Sym->setBind(Bind);
- Sym->setType(ELF::STT_NOTYPE);
- Sym->setVisibility(ELF::STV_DEFAULT);
- Sym->SectionIdx = 0; //ELFSection::SHN_UNDEF;
- Sym->SourceType = isGV;
- return Sym;
- }
-
- // ELF specific fields
- unsigned NameIdx; // Index in .strtab of name, once emitted.
- uint64_t Value;
- unsigned Size;
- uint8_t Info;
- uint8_t Other;
- unsigned short SectionIdx;
-
- // Symbol index into the Symbol table
- unsigned SymTabIdx;
-
- ELFSym() : SourceType(isOther), NameIdx(0), Value(0),
- Size(0), Info(0), Other(ELF::STV_DEFAULT), SectionIdx(0),
- SymTabIdx(0) {}
-
- unsigned getBind() const { return (Info >> 4) & 0xf; }
- unsigned getType() const { return Info & 0xf; }
- bool isLocalBind() const { return getBind() == ELF::STB_LOCAL; }
- bool isFileType() const { return getType() == ELF::STT_FILE; }
-
- void setBind(unsigned X) {
- assert(X == (X & 0xF) && "Bind value out of range!");
- Info = (Info & 0x0F) | (X << 4);
- }
-
- void setType(unsigned X) {
- assert(X == (X & 0xF) && "Type value out of range!");
- Info = (Info & 0xF0) | X;
- }
-
- void setVisibility(unsigned V) {
- assert(V == (V & 0x3) && "Visibility value out of range!");
- Other = V;
- }
- };
-
- /// ELFSection - This struct contains information about each section that is
- /// emitted to the file. This is eventually turned into the section header
- /// table at the end of the file.
- class ELFSection : public BinaryObject {
- public:
- // ELF specific fields
- unsigned NameIdx; // sh_name - .shstrtab idx of name, once emitted.
- unsigned Type; // sh_type - Section contents & semantics
- unsigned Flags; // sh_flags - Section flags.
- uint64_t Addr; // sh_addr - The mem addr this section is in.
- unsigned Offset; // sh_offset - Offset from the file start
- unsigned Size; // sh_size - The section size.
- unsigned Link; // sh_link - Section header table index link.
- unsigned Info; // sh_info - Auxiliary information.
- unsigned Align; // sh_addralign - Alignment of section.
- unsigned EntSize; // sh_entsize - Size of entries in the section e
-
- /// SectionIdx - The number of the section in the Section Table.
- unsigned short SectionIdx;
-
- /// Sym - The symbol to represent this section if it has one.
- ELFSym *Sym;
-
- /// getSymIndex - Returns the symbol table index of the symbol
- /// representing this section.
- unsigned getSymbolTableIndex() const {
- assert(Sym && "section not present in the symbol table");
- return Sym->SymTabIdx;
- }
-
- ELFSection(const std::string &name, bool isLittleEndian, bool is64Bit)
- : BinaryObject(name, isLittleEndian, is64Bit), Type(0), Flags(0), Addr(0),
- Offset(0), Size(0), Link(0), Info(0), Align(0), EntSize(0), Sym(0) {}
- };
-
- /// ELFRelocation - This class contains all the information necessary to
- /// to generate any 32-bit or 64-bit ELF relocation entry.
- class ELFRelocation {
- uint64_t r_offset; // offset in the section of the object this applies to
- uint32_t r_symidx; // symbol table index of the symbol to use
- uint32_t r_type; // machine specific relocation type
- int64_t r_add; // explicit relocation addend
- bool r_rela; // if true then the addend is part of the entry
- // otherwise the addend is at the location specified
- // by r_offset
- public:
- uint64_t getInfo(bool is64Bit) const {
- if (is64Bit)
- return ((uint64_t)r_symidx << 32) + ((uint64_t)r_type & 0xFFFFFFFFL);
- else
- return (r_symidx << 8) + (r_type & 0xFFL);
- }
-
- uint64_t getOffset() const { return r_offset; }
- int64_t getAddend() const { return r_add; }
-
- ELFRelocation(uint64_t off, uint32_t sym, uint32_t type,
- bool rela = true, int64_t addend = 0) :
- r_offset(off), r_symidx(sym), r_type(type),
- r_add(addend), r_rela(rela) {}
- };
-
-} // end namespace llvm
-
-#endif
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