diff options
Diffstat (limited to 'lib/CodeGen/ELF.h')
| -rw-r--r-- | lib/CodeGen/ELF.h | 129 |
1 files changed, 49 insertions, 80 deletions
diff --git a/lib/CodeGen/ELF.h b/lib/CodeGen/ELF.h index c22f6ed92e71..796bc2c3b2c0 100644 --- a/lib/CodeGen/ELF.h +++ b/lib/CodeGen/ELF.h @@ -10,23 +10,24 @@ // 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 stuff is not -// standardized, as far as I can tell. It was largely based on information -// I found in OpenBSD header files. +// 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/GlobalVariable.h" +#include "llvm/CodeGen/BinaryObject.h" #include "llvm/CodeGen/MachineRelocation.h" #include "llvm/Support/DataTypes.h" #include <cstring> namespace llvm { - class GlobalVariable; + class BinaryObject; // Identification Indexes enum { @@ -47,71 +48,28 @@ namespace llvm { ET_HIPROC = 0xffff // Processor-specific }; - // Object file classes. - enum { - ELFCLASS32 = 1, // 32-bit object file - ELFCLASS64 = 2 // 64-bit object file - }; - - // Object file byte orderings. - enum { - ELFDATA2LSB = 1, // Little-endian object file - ELFDATA2MSB = 2 // Big-endian object file - }; - // Versioning enum { EV_NONE = 0, EV_CURRENT = 1 }; - struct ELFHeader { - // e_machine - This field is the target specific value to emit as the - // e_machine member of the ELF header. - unsigned short e_machine; - - // e_flags - The machine flags for the target. This defaults to zero. - unsigned e_flags; - - // e_size - Holds the ELF header's size in bytes - unsigned e_ehsize; - - // Endianess and ELF Class (64 or 32 bits) - unsigned ByteOrder; - unsigned ElfClass; - - unsigned getByteOrder() const { return ByteOrder; } - unsigned getElfClass() const { return ElfClass; } - unsigned getSize() const { return e_ehsize; } - unsigned getMachine() const { return e_machine; } - unsigned getFlags() const { return e_flags; } - - ELFHeader(unsigned short machine, unsigned flags, - bool is64Bit, bool isLittleEndian) - : e_machine(machine), e_flags(flags) { - ElfClass = is64Bit ? ELFCLASS64 : ELFCLASS32; - ByteOrder = isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB; - e_ehsize = is64Bit ? 64 : 52; - } - }; - /// 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. - struct ELFSection { - + class ELFSection : public BinaryObject { + public: // ELF specific fields - std::string Name; // Name of the section. - unsigned NameIdx; // Index in .shstrtab of name, once emitted. - unsigned Type; - unsigned Flags; - uint64_t Addr; - unsigned Offset; - unsigned Size; - unsigned Link; - unsigned Info; - unsigned Align; - unsigned EntSize; + 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 - Auxillary information. + unsigned Align; // sh_addralign - Alignment of section. + unsigned EntSize; // sh_entsize - Size of entries in the section e // Section Header Flags enum { @@ -141,8 +99,8 @@ namespace llvm { SHT_REL = 9, // Relocation entries; no explicit addends. SHT_SHLIB = 10, // Reserved. SHT_DYNSYM = 11, // Symbol table. - SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type. - SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type. + SHT_LOPROC = 0x70000000, // Lowest processor arch-specific type. + SHT_HIPROC = 0x7fffffff, // Highest processor arch-specific type. SHT_LOUSER = 0x80000000, // Lowest type reserved for applications. SHT_HIUSER = 0xffffffff // Highest type reserved for applications. }; @@ -161,22 +119,9 @@ namespace llvm { /// SectionIdx - The number of the section in the Section Table. unsigned short SectionIdx; - /// SectionData - The actual data for this section which we are building - /// up for emission to the file. - std::vector<unsigned char> SectionData; - - /// Relocations - The relocations that we have encountered so far in this - /// section that we will need to convert to Elf relocation entries when - /// the file is written. - std::vector<MachineRelocation> Relocations; - - /// Section Header Size - static unsigned getSectionHdrSize(bool is64Bit) - { return is64Bit ? 64 : 40; } - - ELFSection(const std::string &name) - : Name(name), Type(0), Flags(0), Addr(0), Offset(0), Size(0), - Link(0), Info(0), Align(0), EntSize(0) {} + 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) {} }; /// ELFSym - This struct contains information about each symbol that is @@ -207,9 +152,33 @@ namespace llvm { STT_FILE = 4 }; + enum { + STV_DEFAULT = 0, // Visibility is specified by binding type + STV_INTERNAL = 1, // Defined by processor supplements + STV_HIDDEN = 2, // Not visible to other components + STV_PROTECTED = 3 // Visible in other components but not preemptable + }; + ELFSym(const GlobalValue *gv) : GV(gv), NameIdx(0), Value(0), Size(0), Info(0), Other(0), - SectionIdx(ELFSection::SHN_UNDEF) {} + SectionIdx(ELFSection::SHN_UNDEF) { + if (!GV) + return; + + switch (GV->getVisibility()) { + default: + assert(0 && "unknown visibility type"); + case GlobalValue::DefaultVisibility: + Other = STV_DEFAULT; + break; + case GlobalValue::HiddenVisibility: + Other = STV_HIDDEN; + break; + case GlobalValue::ProtectedVisibility: + Other = STV_PROTECTED; + break; + } + } void SetBind(unsigned X) { assert(X == (X & 0xF) && "Bind value out of range!"); |