/* * The 32-bit mach header appears at the very beginning of the object file for * 32-bit architectures. */ struct mach_header { uint32_t magic; /* mach magic number identifier */ cpu_type_t cputype; /* cpu specifier */ cpu_subtype_t cpusubtype; /* machine specifier */ 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 */ };
/* Constant for the magic field of the mach_header (32-bit architectures) */ #define MH_MAGIC 0xfeedface /* the mach magic number */ #define MH_CIGAM 0xcefaedfe /* NXSwapInt(MH_MAGIC) */
/* * The 64-bit mach header appears at the very beginning of object files for * 64-bit architectures. */ struct mach_header_64 { uint32_t magic; /* mach magic number identifier */ cpu_type_t cputype; /* cpu specifier */ cpu_subtype_t cpusubtype; /* machine specifier */ 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; /* reserved */ };
/* Constant for the magic field of the mach_header_64 (64-bit architectures) */ #define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */ #define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */
struct load_command { uint32_t cmd; /* type of load command */ uint32_t cmdsize; /* total size of commandin bytes */ };
/* * After MacOS X 10.1 when a new load command is added that is required to be * understood by the dynamic linker for the image to execute properly the * LC_REQ_DYLD bit will be or'ed into the load command constant. If the dynamic * linker sees such a load command it it does not understand will issue a * "unknown load command required for execution" error and refuse to use the * image. Other load commands without this bit that are not understood will * simply be ignored. */ #define LC_REQ_DYLD 0x80000000 /* Constants for the cmd field of all load commands, the type */ #define LC_SEGMENT 0x1 /* segment of this file to be mapped */ #define LC_SYMTAB 0x2 /* link-edit stab symbol table info */ #define LC_SYMSEG 0x3 /* link-edit gdb symbol table info (obsolete) */ #define LC_THREAD 0x4 /* thread */ #define LC_UNIXTHREAD 0x5 /* unix thread (includes a stack) */ #define LC_LOADFVMLIB 0x6 /* load a specified fixed VM shared library */ #define LC_IDFVMLIB 0x7 /* fixed VM shared library identification */ #define LC_IDENT 0x8 /* object identification info (obsolete) */ #define LC_FVMFILE 0x9 /* fixed VM file inclusion (internal use) */ #define LC_PREPAGE 0xa /* prepage command (internal use) */ #define LC_DYSYMTAB 0xb /* dynamic link-edit symbol table info */ #define LC_LOAD_DYLIB 0xc /* load a dynamically linked shared library */ ... ... ...
struct segment_command { /* for 32-bit architectures */ uint32_t cmd; /* LC_SEGMENT */ uint32_t cmdsize; /* includes sizeof section structs */ char segname[16]; /* segment name */ uint32_t vmaddr; /* memory address of this segment */ uint32_t vmsize; /* memory size of this segment */ uint32_t fileoff; /* file offset of this segment */ uint32_t filesize; /* amount to map from the file */ vm_prot_t maxprot; /* maximum VM protection */ vm_prot_t initprot; /* initial VM protection */ uint32_t nsects; /* number of sections in segment */ uint32_t flags; /* flags */ };
/* * The 64-bit segment load command indicates that a part of this file is to be * mapped into a 64-bit task's address space. If the 64-bit segment has * sections then section_64 structures directly follow the 64-bit segment * command and their size is reflected in cmdsize. */ struct segment_command_64 { /* for 64-bit architectures */ uint32_t cmd; /* LC_SEGMENT_64 */ uint32_t cmdsize; /* includes sizeof section_64 structs */ char segname[16]; /* segment name */ uint64_t vmaddr; /* memory address of this segment */ uint64_t vmsize; /* memory size of this segment */ uint64_t fileoff; /* file offset of this segment */ uint64_t filesize; /* amount to map from the file */ vm_prot_t maxprot; /* maximum VM protection */ vm_prot_t initprot; /* initial VM protection */ uint32_t nsects; /* number of sections in segment */ uint32_t flags; /* flags */ };
