mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
4e9ca339b5
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68438 91177308-0d34-0410-b5e6-96231b3b80d8
309 lines
11 KiB
C++
309 lines
11 KiB
C++
//===-- llvm/Support/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 stuff is not
|
|
// standardized, as far as I can tell. It was largely based on information
|
|
// I found in OpenBSD header files.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_ELF_H
|
|
#define LLVM_SUPPORT_ELF_H
|
|
|
|
#include "llvm/Support/DataTypes.h"
|
|
#include <cstring>
|
|
|
|
namespace llvm {
|
|
|
|
namespace ELF {
|
|
|
|
typedef uint32_t Elf32_Addr; // Program address
|
|
typedef uint16_t Elf32_Half;
|
|
typedef uint32_t Elf32_Off; // File offset
|
|
typedef int32_t Elf32_Sword;
|
|
typedef uint32_t Elf32_Word;
|
|
|
|
typedef uint64_t Elf64_Addr;
|
|
typedef uint64_t Elf64_Off;
|
|
typedef int32_t Elf64_Shalf;
|
|
typedef int32_t Elf64_Sword;
|
|
typedef uint32_t Elf64_Word;
|
|
typedef int64_t Elf64_Sxword;
|
|
typedef uint64_t Elf64_Xword;
|
|
typedef uint32_t Elf64_Half;
|
|
typedef uint16_t Elf64_Quarter;
|
|
|
|
// Object file magic string.
|
|
static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
|
|
|
|
struct Elf32_Ehdr {
|
|
unsigned char e_ident[16]; // ELF Identification bytes
|
|
Elf32_Half e_type; // Type of file (see ET_* below)
|
|
Elf32_Half e_machine; // Required architecture for this file (see EM_*)
|
|
Elf32_Word e_version; // Must be equal to 1
|
|
Elf32_Addr e_entry; // Address to jump to in order to start program
|
|
Elf32_Off e_phoff; // Program header table's file offset, in bytes
|
|
Elf32_Off e_shoff; // Section header table's file offset, in bytes
|
|
Elf32_Word e_flags; // Processor-specific flags
|
|
Elf32_Half e_ehsize; // Size of ELF header, in bytes
|
|
Elf32_Half e_phentsize; // Size of an entry in the program header table
|
|
Elf32_Half e_phnum; // Number of entries in the program header table
|
|
Elf32_Half e_shentsize; // Size of an entry in the section header table
|
|
Elf32_Half e_shnum; // Number of entries in the section header table
|
|
Elf32_Half e_shstrndx; // Sect hdr table index of sect name string table
|
|
bool checkMagic () const {
|
|
return (memcmp (e_ident, ElfMagic, strlen (ElfMagic))) == 0;
|
|
}
|
|
unsigned char getFileClass () const { return e_ident[4]; }
|
|
unsigned char getDataEncoding () { return e_ident[5]; }
|
|
};
|
|
|
|
// 64-bit ELF header. Fields are the same as for ELF32, but with different
|
|
// types (see above).
|
|
struct Elf64_Ehdr {
|
|
unsigned char e_ident[16];
|
|
Elf64_Quarter e_type;
|
|
Elf64_Quarter e_machine;
|
|
Elf64_Half e_version;
|
|
Elf64_Addr e_entry;
|
|
Elf64_Off e_phoff;
|
|
Elf64_Off e_shoff;
|
|
Elf64_Half e_flags;
|
|
Elf64_Quarter e_ehsize;
|
|
Elf64_Quarter e_phentsize;
|
|
Elf64_Quarter e_phnum;
|
|
Elf64_Quarter e_shentsize;
|
|
Elf64_Quarter e_shnum;
|
|
Elf64_Quarter e_shstrndx;
|
|
};
|
|
|
|
// File types
|
|
enum {
|
|
ET_NONE = 0, // No file type
|
|
ET_REL = 1, // Relocatable file
|
|
ET_EXEC = 2, // Executable file
|
|
ET_DYN = 3, // Shared object file
|
|
ET_CORE = 4, // Core file
|
|
ET_LOPROC = 0xff00, // Beginning of processor-specific codes
|
|
ET_HIPROC = 0xffff // Processor-specific
|
|
};
|
|
|
|
// Machine architectures
|
|
enum {
|
|
EM_NONE = 0, // No machine
|
|
EM_M32 = 1, // AT&T WE 32100
|
|
EM_SPARC = 2, // SPARC
|
|
EM_386 = 3, // Intel 386
|
|
EM_68K = 4, // Motorola 68000
|
|
EM_88K = 5, // Motorola 88000
|
|
EM_486 = 6, // Intel 486 (deprecated)
|
|
EM_860 = 7, // Intel 80860
|
|
EM_MIPS = 8, // MIPS R3000
|
|
EM_PPC = 20, // PowerPC
|
|
EM_ARM = 40, // ARM
|
|
EM_ALPHA = 41, // DEC Alpha
|
|
EM_SPARCV9 = 43 // SPARC V9
|
|
};
|
|
|
|
// 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
|
|
};
|
|
|
|
// Section header.
|
|
struct Elf32_Shdr {
|
|
Elf32_Word sh_name; // Section name (index into string table)
|
|
Elf32_Word sh_type; // Section type (SHT_*)
|
|
Elf32_Word sh_flags; // Section flags (SHF_*)
|
|
Elf32_Addr sh_addr; // Address where section is to be loaded
|
|
Elf32_Off sh_offset; // File offset of section data, in bytes
|
|
Elf32_Word sh_size; // Size of section, in bytes
|
|
Elf32_Word sh_link; // Section type-specific header table index link
|
|
Elf32_Word sh_info; // Section type-specific extra information
|
|
Elf32_Word sh_addralign; // Section address alignment
|
|
Elf32_Word sh_entsize; // Size of records contained within the section
|
|
};
|
|
|
|
// Section header for ELF64 - same fields as ELF32, different types.
|
|
struct Elf64_Shdr {
|
|
Elf64_Half sh_name;
|
|
Elf64_Half sh_type;
|
|
Elf64_Xword sh_flags;
|
|
Elf64_Addr sh_addr;
|
|
Elf64_Off sh_offset;
|
|
Elf64_Xword sh_size;
|
|
Elf64_Half sh_link;
|
|
Elf64_Half sh_info;
|
|
Elf64_Xword sh_addralign;
|
|
Elf64_Xword sh_entsize;
|
|
};
|
|
|
|
// Special section indices.
|
|
enum {
|
|
SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless
|
|
SHN_LORESERVE = 0xff00, // Lowest reserved index
|
|
SHN_LOPROC = 0xff00, // Lowest processor-specific index
|
|
SHN_HIPROC = 0xff1f, // Highest processor-specific index
|
|
SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation
|
|
SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
|
|
SHN_HIRESERVE = 0xffff // Highest reserved index
|
|
};
|
|
|
|
// Section types.
|
|
enum {
|
|
SHT_NULL = 0, // No associated section (inactive entry).
|
|
SHT_PROGBITS = 1, // Program-defined contents.
|
|
SHT_SYMTAB = 2, // Symbol table.
|
|
SHT_STRTAB = 3, // String table.
|
|
SHT_RELA = 4, // Relocation entries; explicit addends.
|
|
SHT_HASH = 5, // Symbol hash table.
|
|
SHT_DYNAMIC = 6, // Information for dynamic linking.
|
|
SHT_NOTE = 7, // Information about the file.
|
|
SHT_NOBITS = 8, // Data occupies no space in the file.
|
|
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_LOUSER = 0x80000000, // Lowest type reserved for applications.
|
|
SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
|
|
};
|
|
|
|
// Section flags.
|
|
enum {
|
|
SHF_WRITE = 0x1, // Section data should be writable during execution.
|
|
SHF_ALLOC = 0x2, // Section occupies memory during program execution.
|
|
SHF_EXECINSTR = 0x4, // Section contains executable machine instructions.
|
|
SHF_MASKPROC = 0xf0000000 // Bits indicating processor-specific flags.
|
|
};
|
|
|
|
// Symbol table entries.
|
|
struct Elf32_Sym {
|
|
Elf32_Word st_name; // Symbol name (index into string table)
|
|
Elf32_Addr st_value; // Value or address associated with the symbol
|
|
Elf32_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
|
|
Elf32_Half st_shndx; // Which section (header table index) it's defined in
|
|
|
|
// 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);
|
|
}
|
|
};
|
|
|
|
// Symbol bindings.
|
|
enum {
|
|
STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
|
|
STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
|
|
STB_WEAK = 2, // Weak symbol, like global but lower-precedence
|
|
STB_LOPROC = 13, // Lowest processor-specific binding type
|
|
STB_HIPROC = 15 // Highest processor-specific binding type
|
|
};
|
|
|
|
// Symbol types.
|
|
enum {
|
|
STT_NOTYPE = 0, // Symbol's type is not specified
|
|
STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.)
|
|
STT_FUNC = 2, // Symbol is executable code (function, etc.)
|
|
STT_SECTION = 3, // Symbol refers to a section
|
|
STT_FILE = 4, // Local, absolute symbol that refers to a file
|
|
STT_LOPROC = 13, // Lowest processor-specific symbol type
|
|
STT_HIPROC = 15 // Highest processor-specific symbol type
|
|
};
|
|
|
|
// Relocation entry, without explicit addend.
|
|
struct Elf32_Rel {
|
|
Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
|
|
Elf32_Word r_info; // Symbol table index and type of relocation to apply
|
|
|
|
// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
|
|
// and ELF32_R_INFO macros defined in the ELF specification:
|
|
Elf32_Word getSymbol () const { return (r_info >> 8); }
|
|
unsigned char getType () const { return (unsigned char) (r_info & 0x0ff); }
|
|
void setSymbol (Elf32_Word s) { setSymbolAndType (s, getType ()); }
|
|
void setType (unsigned char t) { setSymbolAndType (getSymbol(), t); }
|
|
void setSymbolAndType (Elf32_Word s, unsigned char t) {
|
|
r_info = (s << 8) + t;
|
|
};
|
|
};
|
|
|
|
// Relocation entry with explicit addend.
|
|
struct Elf32_Rela {
|
|
Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
|
|
Elf32_Word r_info; // Symbol table index and type of relocation to apply
|
|
Elf32_Sword r_addend; // Compute value for relocatable field by adding this
|
|
|
|
// These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
|
|
// and ELF32_R_INFO macros defined in the ELF specification:
|
|
Elf32_Word getSymbol () const { return (r_info >> 8); }
|
|
unsigned char getType () const { return (unsigned char) (r_info & 0x0ff); }
|
|
void setSymbol (Elf32_Word s) { setSymbolAndType (s, getType ()); }
|
|
void setType (unsigned char t) { setSymbolAndType (getSymbol(), t); }
|
|
void setSymbolAndType (Elf32_Word s, unsigned char t) {
|
|
r_info = (s << 8) + t;
|
|
};
|
|
};
|
|
|
|
// Program header.
|
|
struct Elf32_Phdr {
|
|
Elf32_Word p_type; // Type of segment
|
|
Elf32_Off p_offset; // File offset where segment is located, in bytes
|
|
Elf32_Addr p_vaddr; // Virtual address of beginning of segment
|
|
Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
|
|
Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
|
|
Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
|
|
Elf32_Word p_flags; // Segment flags
|
|
Elf32_Word p_align; // Segment alignment constraint
|
|
};
|
|
|
|
// Segment types.
|
|
enum {
|
|
PT_NULL = 0, // Unused segment.
|
|
PT_LOAD = 1, // Loadable segment.
|
|
PT_DYNAMIC = 2, // Dynamic linking information.
|
|
PT_INTERP = 3, // Interpreter pathname.
|
|
PT_NOTE = 4, // Auxiliary information.
|
|
PT_SHLIB = 5, // Reserved.
|
|
PT_PHDR = 6, // The program header table itself.
|
|
PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
|
|
PT_HIPROC = 0x7fffffff // Highest processor-specific program hdr entry type.
|
|
};
|
|
|
|
// Segment flag bits.
|
|
enum {
|
|
PF_X = 1, // Execute
|
|
PF_W = 2, // Write
|
|
PF_R = 4, // Read
|
|
PF_MASKPROC = 0xf0000000 // Unspecified
|
|
};
|
|
|
|
} // end namespace ELF
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|