mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-22 10:29:35 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74817 91177308-0d34-0410-b5e6-96231b3b80d8
413 lines
17 KiB
C++
413 lines
17 KiB
C++
//=== MachO.h - Mach-O structures and constants -----------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines MachO .
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef MACHO_H
|
|
#define MACHO_H
|
|
|
|
#include "llvm/CodeGen/BinaryObject.h"
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
namespace llvm {
|
|
|
|
class GlobalValue;
|
|
class TargetAsmInfo;
|
|
|
|
/// MachOSym - 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 MachOSym {
|
|
const GlobalValue *GV; // The global value this corresponds to.
|
|
std::string GVName; // The mangled name of the global value.
|
|
uint32_t n_strx; // index into the string table
|
|
uint8_t n_type; // type flag
|
|
uint8_t n_sect; // section number or NO_SECT
|
|
int16_t n_desc; // see <mach-o/stab.h>
|
|
uint64_t n_value; // value for this symbol (or stab offset)
|
|
|
|
// Constants for the n_sect field
|
|
// see <mach-o/nlist.h>
|
|
enum { NO_SECT = 0 }; // symbol is not in any section
|
|
|
|
// Constants for the n_type field
|
|
// see <mach-o/nlist.h>
|
|
enum { N_UNDF = 0x0, // undefined, n_sect == NO_SECT
|
|
N_ABS = 0x2, // absolute, n_sect == NO_SECT
|
|
N_SECT = 0xe, // defined in section number n_sect
|
|
N_PBUD = 0xc, // prebound undefined (defined in a dylib)
|
|
N_INDR = 0xa // indirect
|
|
};
|
|
// The following bits are OR'd into the types above. For example, a type
|
|
// of 0x0f would be an external N_SECT symbol (0x0e | 0x01).
|
|
enum { N_EXT = 0x01, // external symbol bit
|
|
N_PEXT = 0x10 // private external symbol bit
|
|
};
|
|
|
|
// Constants for the n_desc field
|
|
// see <mach-o/loader.h>
|
|
enum { REFERENCE_FLAG_UNDEFINED_NON_LAZY = 0,
|
|
REFERENCE_FLAG_UNDEFINED_LAZY = 1,
|
|
REFERENCE_FLAG_DEFINED = 2,
|
|
REFERENCE_FLAG_PRIVATE_DEFINED = 3,
|
|
REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY = 4,
|
|
REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY = 5
|
|
};
|
|
enum { N_NO_DEAD_STRIP = 0x0020, // symbol is not to be dead stripped
|
|
N_WEAK_REF = 0x0040, // symbol is weak referenced
|
|
N_WEAK_DEF = 0x0080 // coalesced symbol is a weak definition
|
|
};
|
|
|
|
MachOSym(const GlobalValue *gv, std::string name, uint8_t sect,
|
|
const TargetAsmInfo *TAI);
|
|
|
|
struct SymCmp {
|
|
// FIXME: this does not appear to be sorting 'f' after 'F'
|
|
bool operator()(const MachOSym &LHS, const MachOSym &RHS) {
|
|
return LHS.GVName < RHS.GVName;
|
|
}
|
|
};
|
|
|
|
|
|
/// PartitionByLocal - Simple boolean predicate that returns true if Sym is
|
|
/// a local symbol rather than an external symbol.
|
|
|
|
static inline bool PartitionByLocal(const MachOSym &Sym) {
|
|
return (Sym.n_type & (MachOSym::N_EXT | MachOSym::N_PEXT)) == 0;
|
|
}
|
|
|
|
/// PartitionByDefined - Simple boolean predicate that returns true if Sym is
|
|
/// defined in this module.
|
|
|
|
static inline bool PartitionByDefined(const MachOSym &Sym) {
|
|
// FIXME: Do N_ABS or N_INDR count as defined?
|
|
return (Sym.n_type & MachOSym::N_SECT) == MachOSym::N_SECT;
|
|
}
|
|
|
|
}; // end struct MachOSym
|
|
|
|
/// MachOHeader - This struct contains the header information about a
|
|
/// specific architecture type/subtype pair that is emitted to the file.
|
|
|
|
struct MachOHeader {
|
|
uint32_t magic; // mach magic number identifier
|
|
uint32_t filetype; // type of file
|
|
uint32_t ncmds; // number of load commands
|
|
uint32_t sizeofcmds; // the size of all the load commands
|
|
uint32_t flags; // flags
|
|
uint32_t reserved; // 64-bit only
|
|
|
|
/// HeaderData - The actual data for the header which we are building
|
|
/// up for emission to the file.
|
|
std::vector<unsigned char> HeaderData;
|
|
|
|
// Constants for the filetype field
|
|
// see <mach-o/loader.h> for additional info on the various types
|
|
enum { MH_OBJECT = 1, // relocatable object file
|
|
MH_EXECUTE = 2, // demand paged executable file
|
|
MH_FVMLIB = 3, // fixed VM shared library file
|
|
MH_CORE = 4, // core file
|
|
MH_PRELOAD = 5, // preloaded executable file
|
|
MH_DYLIB = 6, // dynamically bound shared library
|
|
MH_DYLINKER = 7, // dynamic link editor
|
|
MH_BUNDLE = 8, // dynamically bound bundle file
|
|
MH_DYLIB_STUB = 9, // shared library stub for static linking only
|
|
MH_DSYM = 10 // companion file wiht only debug sections
|
|
};
|
|
|
|
// Constants for the flags field
|
|
enum { MH_NOUNDEFS = 1 << 0,
|
|
// the object file has no undefined references
|
|
MH_INCRLINK = 1 << 1,
|
|
// the object file is the output of an incremental link against
|
|
// a base file and cannot be link edited again
|
|
MH_DYLDLINK = 1 << 2,
|
|
// the object file is input for the dynamic linker and cannot be
|
|
// statically link edited again.
|
|
MH_BINDATLOAD = 1 << 3,
|
|
// the object file's undefined references are bound by the
|
|
// dynamic linker when loaded.
|
|
MH_PREBOUND = 1 << 4,
|
|
// the file has its dynamic undefined references prebound
|
|
MH_SPLIT_SEGS = 1 << 5,
|
|
// the file has its read-only and read-write segments split
|
|
// see <mach/shared_memory_server.h>
|
|
MH_LAZY_INIT = 1 << 6,
|
|
// the shared library init routine is to be run lazily via
|
|
// catching memory faults to its writable segments (obsolete)
|
|
MH_TWOLEVEL = 1 << 7,
|
|
// the image is using two-level namespace bindings
|
|
MH_FORCE_FLAT = 1 << 8,
|
|
// the executable is forcing all images to use flat namespace
|
|
// bindings.
|
|
MH_NOMULTIDEFS = 1 << 8,
|
|
// this umbrella guarantees no multiple definitions of symbols
|
|
// in its sub-images so the two-level namespace hints can
|
|
// always be used.
|
|
MH_NOFIXPREBINDING = 1 << 10,
|
|
// do not have dyld notify the prebidning agent about this
|
|
// executable.
|
|
MH_PREBINDABLE = 1 << 11,
|
|
// the binary is not prebound but can have its prebinding
|
|
// redone. only used when MH_PREBOUND is not set.
|
|
MH_ALLMODSBOUND = 1 << 12,
|
|
// indicates that this binary binds to all two-level namespace
|
|
// modules of its dependent libraries. Only used when
|
|
// MH_PREBINDABLE and MH_TWOLEVEL are both set.
|
|
MH_SUBSECTIONS_VIA_SYMBOLS = 1 << 13,
|
|
// safe to divide up the sections into sub-sections via symbols
|
|
// for dead code stripping.
|
|
MH_CANONICAL = 1 << 14,
|
|
// the binary has been canonicalized via the unprebind operation
|
|
MH_WEAK_DEFINES = 1 << 15,
|
|
// the final linked image contains external weak symbols
|
|
MH_BINDS_TO_WEAK = 1 << 16,
|
|
// the final linked image uses weak symbols
|
|
MH_ALLOW_STACK_EXECUTION = 1 << 17
|
|
// When this bit is set, all stacks in the task will be given
|
|
// stack execution privilege. Only used in MH_EXECUTE filetype
|
|
};
|
|
|
|
MachOHeader() : magic(0), filetype(0), ncmds(0), sizeofcmds(0), flags(0),
|
|
reserved(0) {}
|
|
|
|
/// cmdSize - This routine returns the size of the MachOSection as written
|
|
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
|
|
unsigned cmdSize(bool is64Bit) const {
|
|
if (is64Bit)
|
|
return 8 * sizeof(uint32_t);
|
|
else
|
|
return 7 * sizeof(uint32_t);
|
|
}
|
|
|
|
/// setMagic - This routine sets the appropriate value for the 'magic'
|
|
/// field based on pointer size and endianness.
|
|
void setMagic(bool isLittleEndian, bool is64Bit) {
|
|
if (isLittleEndian)
|
|
if (is64Bit) magic = 0xcffaedfe;
|
|
else magic = 0xcefaedfe;
|
|
else
|
|
if (is64Bit) magic = 0xfeedfacf;
|
|
else magic = 0xfeedface;
|
|
}
|
|
|
|
}; // end struct MachOHeader
|
|
|
|
/// MachOSegment - This struct contains the necessary information to
|
|
/// emit the load commands for each section in the file.
|
|
struct MachOSegment {
|
|
uint32_t cmd; // LC_SEGMENT or LC_SEGMENT_64
|
|
uint32_t cmdsize; // Total size of this struct and section commands
|
|
std::string segname; // segment name
|
|
uint64_t vmaddr; // address of this segment
|
|
uint64_t vmsize; // size of this segment, may be larger than filesize
|
|
uint64_t fileoff; // offset in file
|
|
uint64_t filesize; // amount to read from file
|
|
uint32_t maxprot; // maximum VM protection
|
|
uint32_t initprot; // initial VM protection
|
|
uint32_t nsects; // number of sections in this segment
|
|
uint32_t flags; // flags
|
|
|
|
// The following constants are getting pulled in by one of the
|
|
// system headers, which creates a neat clash with the enum.
|
|
#if !defined(VM_PROT_NONE)
|
|
#define VM_PROT_NONE 0x00
|
|
#endif
|
|
#if !defined(VM_PROT_READ)
|
|
#define VM_PROT_READ 0x01
|
|
#endif
|
|
#if !defined(VM_PROT_WRITE)
|
|
#define VM_PROT_WRITE 0x02
|
|
#endif
|
|
#if !defined(VM_PROT_EXECUTE)
|
|
#define VM_PROT_EXECUTE 0x04
|
|
#endif
|
|
#if !defined(VM_PROT_ALL)
|
|
#define VM_PROT_ALL 0x07
|
|
#endif
|
|
|
|
// Constants for the vm protection fields
|
|
// see <mach-o/vm_prot.h>
|
|
enum { SEG_VM_PROT_NONE = VM_PROT_NONE,
|
|
SEG_VM_PROT_READ = VM_PROT_READ, // read permission
|
|
SEG_VM_PROT_WRITE = VM_PROT_WRITE, // write permission
|
|
SEG_VM_PROT_EXECUTE = VM_PROT_EXECUTE,
|
|
SEG_VM_PROT_ALL = VM_PROT_ALL
|
|
};
|
|
|
|
// Constants for the cmd field
|
|
// see <mach-o/loader.h>
|
|
enum { LC_SEGMENT = 0x01, // segment of this file to be mapped
|
|
LC_SEGMENT_64 = 0x19 // 64-bit segment of this file to be mapped
|
|
};
|
|
|
|
/// cmdSize - This routine returns the size of the MachOSection as written
|
|
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
|
|
unsigned cmdSize(bool is64Bit) const {
|
|
if (is64Bit)
|
|
return 6 * sizeof(uint32_t) + 4 * sizeof(uint64_t) + 16;
|
|
else
|
|
return 10 * sizeof(uint32_t) + 16; // addresses only 32 bits
|
|
}
|
|
|
|
MachOSegment(const std::string &seg, bool is64Bit)
|
|
: cmd(is64Bit ? LC_SEGMENT_64 : LC_SEGMENT), cmdsize(0), segname(seg),
|
|
vmaddr(0), vmsize(0), fileoff(0), filesize(0), maxprot(VM_PROT_ALL),
|
|
initprot(VM_PROT_ALL), nsects(0), flags(0) { }
|
|
};
|
|
|
|
/// MachOSection - This struct contains information about each section in a
|
|
/// particular segment that is emitted to the file. This is eventually
|
|
/// turned into the SectionCommand in the load command for a particlar
|
|
/// segment.
|
|
|
|
struct MachOSection : public BinaryObject {
|
|
std::string sectname; // name of this section,
|
|
std::string segname; // segment this section goes in
|
|
uint64_t addr; // memory address of this section
|
|
uint32_t offset; // file offset of this section
|
|
uint32_t align; // section alignment (power of 2)
|
|
uint32_t reloff; // file offset of relocation entries
|
|
uint32_t nreloc; // number of relocation entries
|
|
uint32_t flags; // flags (section type and attributes)
|
|
uint32_t reserved1; // reserved (for offset or index)
|
|
uint32_t reserved2; // reserved (for count or sizeof)
|
|
uint32_t reserved3; // reserved (64 bit only)
|
|
|
|
/// A unique number for this section, which will be used to match symbols
|
|
/// to the correct section.
|
|
uint32_t Index;
|
|
|
|
/// RelocBuffer - A buffer to hold the mach-o relocations before we write
|
|
/// them out at the appropriate location in the file.
|
|
std::vector<unsigned char> RelocBuffer;
|
|
|
|
// Constants for the section types (low 8 bits of flags field)
|
|
// see <mach-o/loader.h>
|
|
enum { S_REGULAR = 0,
|
|
// regular section
|
|
S_ZEROFILL = 1,
|
|
// zero fill on demand section
|
|
S_CSTRING_LITERALS = 2,
|
|
// section with only literal C strings
|
|
S_4BYTE_LITERALS = 3,
|
|
// section with only 4 byte literals
|
|
S_8BYTE_LITERALS = 4,
|
|
// section with only 8 byte literals
|
|
S_LITERAL_POINTERS = 5,
|
|
// section with only pointers to literals
|
|
S_NON_LAZY_SYMBOL_POINTERS = 6,
|
|
// section with only non-lazy symbol pointers
|
|
S_LAZY_SYMBOL_POINTERS = 7,
|
|
// section with only lazy symbol pointers
|
|
S_SYMBOL_STUBS = 8,
|
|
// section with only symbol stubs
|
|
// byte size of stub in the reserved2 field
|
|
S_MOD_INIT_FUNC_POINTERS = 9,
|
|
// section with only function pointers for initialization
|
|
S_MOD_TERM_FUNC_POINTERS = 10,
|
|
// section with only function pointers for termination
|
|
S_COALESCED = 11,
|
|
// section contains symbols that are coalesced
|
|
S_GB_ZEROFILL = 12,
|
|
// zero fill on demand section (that can be larger than 4GB)
|
|
S_INTERPOSING = 13,
|
|
// section with only pairs of function pointers for interposing
|
|
S_16BYTE_LITERALS = 14
|
|
// section with only 16 byte literals
|
|
};
|
|
|
|
// Constants for the section flags (high 24 bits of flags field)
|
|
// see <mach-o/loader.h>
|
|
enum { S_ATTR_PURE_INSTRUCTIONS = 1 << 31,
|
|
// section contains only true machine instructions
|
|
S_ATTR_NO_TOC = 1 << 30,
|
|
// section contains coalesced symbols that are not to be in a
|
|
// ranlib table of contents
|
|
S_ATTR_STRIP_STATIC_SYMS = 1 << 29,
|
|
// ok to strip static symbols in this section in files with the
|
|
// MY_DYLDLINK flag
|
|
S_ATTR_NO_DEAD_STRIP = 1 << 28,
|
|
// no dead stripping
|
|
S_ATTR_LIVE_SUPPORT = 1 << 27,
|
|
// blocks are live if they reference live blocks
|
|
S_ATTR_SELF_MODIFYING_CODE = 1 << 26,
|
|
// used with i386 code stubs written on by dyld
|
|
S_ATTR_DEBUG = 1 << 25,
|
|
// a debug section
|
|
S_ATTR_SOME_INSTRUCTIONS = 1 << 10,
|
|
// section contains some machine instructions
|
|
S_ATTR_EXT_RELOC = 1 << 9,
|
|
// section has external relocation entries
|
|
S_ATTR_LOC_RELOC = 1 << 8
|
|
// section has local relocation entries
|
|
};
|
|
|
|
/// cmdSize - This routine returns the size of the MachOSection as written
|
|
/// to disk, depending on whether the destination is a 64 bit Mach-O file.
|
|
unsigned cmdSize(bool is64Bit) const {
|
|
if (is64Bit)
|
|
return 7 * sizeof(uint32_t) + 2 * sizeof(uint64_t) + 32;
|
|
else
|
|
return 9 * sizeof(uint32_t) + 32; // addresses only 32 bits
|
|
}
|
|
|
|
MachOSection(const std::string &seg, const std::string §)
|
|
: BinaryObject(), sectname(sect), segname(seg), addr(0), offset(0),
|
|
align(2), reloff(0), nreloc(0), flags(0), reserved1(0), reserved2(0),
|
|
reserved3(0) { }
|
|
|
|
}; // end struct MachOSection
|
|
|
|
/// MachOSymTab - This struct contains information about the offsets and
|
|
/// size of symbol table information.
|
|
/// segment.
|
|
struct MachODySymTab {
|
|
uint32_t cmd; // LC_DYSYMTAB
|
|
uint32_t cmdsize; // sizeof(MachODySymTab)
|
|
uint32_t ilocalsym; // index to local symbols
|
|
uint32_t nlocalsym; // number of local symbols
|
|
uint32_t iextdefsym; // index to externally defined symbols
|
|
uint32_t nextdefsym; // number of externally defined symbols
|
|
uint32_t iundefsym; // index to undefined symbols
|
|
uint32_t nundefsym; // number of undefined symbols
|
|
uint32_t tocoff; // file offset to table of contents
|
|
uint32_t ntoc; // number of entries in table of contents
|
|
uint32_t modtaboff; // file offset to module table
|
|
uint32_t nmodtab; // number of module table entries
|
|
uint32_t extrefsymoff; // offset to referenced symbol table
|
|
uint32_t nextrefsyms; // number of referenced symbol table entries
|
|
uint32_t indirectsymoff; // file offset to the indirect symbol table
|
|
uint32_t nindirectsyms; // number of indirect symbol table entries
|
|
uint32_t extreloff; // offset to external relocation entries
|
|
uint32_t nextrel; // number of external relocation entries
|
|
uint32_t locreloff; // offset to local relocation entries
|
|
uint32_t nlocrel; // number of local relocation entries
|
|
|
|
// Constants for the cmd field
|
|
// see <mach-o/loader.h>
|
|
enum { LC_DYSYMTAB = 0x0B // dynamic link-edit symbol table info
|
|
};
|
|
|
|
MachODySymTab() : cmd(LC_DYSYMTAB), cmdsize(20 * sizeof(uint32_t)),
|
|
ilocalsym(0), nlocalsym(0), iextdefsym(0), nextdefsym(0),
|
|
iundefsym(0), nundefsym(0), tocoff(0), ntoc(0), modtaboff(0),
|
|
nmodtab(0), extrefsymoff(0), nextrefsyms(0), indirectsymoff(0),
|
|
nindirectsyms(0), extreloff(0), nextrel(0), locreloff(0), nlocrel(0) {}
|
|
|
|
}; // end struct MachODySymTab
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif
|
|
|