/* 
 * mach_o.h is needed to load mach-o executable.
 *
 */

#ifndef MACH_O
#define MACH_O

typedef int	cpu_type_t;
typedef int	cpu_subtype_t;
typedef int cpu_threadtype_t;
typedef int vm_prot_t;

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 */
};

#define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */
#define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */

#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 */
#define	LC_ID_DYLIB	0xd	/* dynamically linked shared lib ident */
#define LC_LOAD_DYLINKER 0xe	/* load a dynamic linker */
#define LC_ID_DYLINKER	0xf	/* dynamic linker identification */
#define	LC_PREBOUND_DYLIB 0x10	/* modules prebound for a dynamically */
				/*  linked shared library */
#define	LC_ROUTINES	0x11	/* image routines */
#define	LC_SUB_FRAMEWORK 0x12	/* sub framework */
#define	LC_SUB_UMBRELLA 0x13	/* sub umbrella */
#define	LC_SUB_CLIENT	0x14	/* sub client */
#define	LC_SUB_LIBRARY  0x15	/* sub library */
#define	LC_TWOLEVEL_HINTS 0x16	/* two-level namespace lookup hints */
#define	LC_PREBIND_CKSUM  0x17	/* prebind checksum */

/*
 * load a dynamically linked shared library that is allowed to be missing
 * (all symbols are weak imported).
 */
#define	LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)

#define	LC_SEGMENT_64	0x19	/* 64-bit segment of this file to be
				   mapped */
#define	LC_ROUTINES_64	0x1a	/* 64-bit image routines */
#define LC_UUID		0x1b	/* the uuid */
#define LC_RPATH       (0x1c | LC_REQ_DYLD)    /* runpath additions */
#define LC_CODE_SIGNATURE 0x1d	/* local of code signature */
#define LC_SEGMENT_SPLIT_INFO 0x1e /* local of info to split segments */
#define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD) /* load and re-export dylib */
#define	LC_LAZY_LOAD_DYLIB 0x20	/* delay load of dylib until first use */
#define	LC_ENCRYPTION_INFO 0x21	/* encrypted segment information */
#define	LC_DYLD_INFO 	0x22	/* compressed dyld information */
#define	LC_DYLD_INFO_ONLY (0x22|LC_REQ_DYLD)	/* compressed dyld information only */
#define	LC_LOAD_UPWARD_DYLIB (0x23 | LC_REQ_DYLD) /* load upward dylib */
#define LC_VERSION_MIN_MACOSX 0x24   /* build for MacOSX min OS version */
#define LC_VERSION_MIN_IPHONEOS 0x25 /* build for iPhoneOS min OS version */
#define LC_FUNCTION_STARTS 0x26 /* compressed table of function start addresses */
#define LC_DYLD_ENVIRONMENT 0x27 /* string for dyld to treat
				    like environment variable */
#define LC_MAIN (0x28|LC_REQ_DYLD) /* replacement for LC_UNIXTHREAD */
#define LC_DATA_IN_CODE 0x29 /* table of non-instructions in __text */
#define LC_SOURCE_VERSION 0x2A /* source version used to build binary */
#define LC_DYLIB_CODE_SIGN_DRS 0x2B /* Code signing DRs copied from linked dylibs */

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 */
};

#define	SG_HIGHVM	0x1	/* the file contents for this segment is for
				   the high part of the VM space, the low part
				   is zero filled (for stacks in core files) */
#define	SG_FVMLIB	0x2	/* this segment is the VM that is allocated by
				   a fixed VM library, for overlap checking in
				   the link editor */
#define	SG_NORELOC	0x4	/* this segment has nothing that was relocated
				   in it and nothing relocated to it, that is
				   it maybe safely replaced without relocation*/
#define SG_PROTECTED_VERSION_1	0x8 /* This segment is protected.  If the*/

struct section_64 { /* for 64-bit architectures */
	char		sectname[16];	/* name of this section */
	char		segname[16];	/* segment this section goes in */
	uint64_t	addr;		/* memory address of this section */
	uint64_t	size;		/* size in bytes 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 */
};

#define SECTION_TYPE		 0x000000ff	/* 256 section types */
#define SECTION_ATTRIBUTES	 0xffffff00	/*  24 section attributes */

/* Constants for the type of a section */
#define	S_REGULAR		0x0	/* regular section */
#define	S_ZEROFILL		0x1	/* zero fill on demand section */
#define	S_CSTRING_LITERALS	0x2	/* section with only literal C strings*/
#define	S_4BYTE_LITERALS	0x3	/* section with only 4 byte literals */
#define	S_8BYTE_LITERALS	0x4	/* section with only 8 byte literals */
#define	S_LITERAL_POINTERS	0x5	/* section with only pointers to */
					/*  literals */
/*
 * For the two types of symbol pointers sections and the symbol stubs section
 * they have indirect symbol table entries.  For each of the entries in the
 * section the indirect symbol table entries, in corresponding order in the
 * indirect symbol table, start at the index stored in the reserved1 field
 * of the section structure.  Since the indirect symbol table entries
 * correspond to the entries in the section the number of indirect symbol table
 * entries is inferred from the size of the section divided by the size of the
 * entries in the section.  For symbol pointers sections the size of the entries
 * in the section is 4 bytes and for symbol stubs sections the byte size of the
 * stubs is stored in the reserved2 field of the section structure.
 */
#define	S_NON_LAZY_SYMBOL_POINTERS	0x6	/* section with only non-lazy
						   symbol pointers */
#define	S_LAZY_SYMBOL_POINTERS		0x7	/* section with only lazy symbol
						   pointers */
#define	S_SYMBOL_STUBS			0x8	/* section with only symbol
						   stubs, byte size of stub in
						   the reserved2 field */
#define	S_MOD_INIT_FUNC_POINTERS	0x9	/* section with only function
						   pointers for initialization*/
#define	S_MOD_TERM_FUNC_POINTERS	0xa	/* section with only function
						   pointers for termination */
#define	S_COALESCED			0xb	/* section contains symbols that
						   are to be coalesced */
#define	S_GB_ZEROFILL			0xc	/* zero fill on demand section
						   (that can be larger than 4
						   gigabytes) */
#define	S_INTERPOSING			0xd	/* section with only pairs of
						   function pointers for
						   interposing */
#define	S_16BYTE_LITERALS		0xe	/* section with only 16 byte
						   literals */
#define	S_DTRACE_DOF			0xf	/* section contains 
						   DTrace Object Format */
#define	S_LAZY_DYLIB_SYMBOL_POINTERS	0x10	/* section with only lazy
						   symbol pointers to lazy
						   loaded dylibs */
/*
 * Constants for the section attributes part of the flags field of a section
 * structure.
 */
#define SECTION_ATTRIBUTES_USR	 0xff000000	/* User setable attributes */
#define S_ATTR_PURE_INSTRUCTIONS 0x80000000	/* section contains only true
						   machine instructions */
#define S_ATTR_NO_TOC 		 0x40000000	/* section contains coalesced
						   symbols that are not to be
						   in a ranlib table of
						   contents */
#define S_ATTR_STRIP_STATIC_SYMS 0x20000000	/* ok to strip static symbols
						   in this section in files
						   with the MH_DYLDLINK flag */
#define S_ATTR_NO_DEAD_STRIP	 0x10000000	/* no dead stripping */
#define S_ATTR_LIVE_SUPPORT	 0x08000000	/* blocks are live if they
						   reference live blocks */
#define S_ATTR_SELF_MODIFYING_CODE 0x04000000	/* Used with i386 code stubs
						   written on by dyld */
/*
 * If a segment contains any sections marked with S_ATTR_DEBUG then all
 * sections in that segment must have this attribute.  No section other than
 * a section marked with this attribute may reference the contents of this
 * section.  A section with this attribute may contain no symbols and must have
 * a section type S_REGULAR.  The static linker will not copy section contents
 * from sections with this attribute into its output file.  These sections
 * generally contain DWARF debugging info.
 */ 
#define	S_ATTR_DEBUG		 0x02000000	/* a debug section */
#define SECTION_ATTRIBUTES_SYS	 0x00ffff00	/* system setable attributes */
#define S_ATTR_SOME_INSTRUCTIONS 0x00000400	/* section contains some
						   machine instructions */
#define S_ATTR_EXT_RELOC	 0x00000200	/* section has external
						   relocation entries */
#define S_ATTR_LOC_RELOC	 0x00000100	/* section has local
						   relocation entries */


/*
 * The names of segments and sections in them are mostly meaningless to the
 * link-editor.  But there are few things to support traditional UNIX
 * executables that require the link-editor and assembler to use some names
 * agreed upon by convention.
 *
 * The initial protection of the "__TEXT" segment has write protection turned
 * off (not writeable).
 *
 * The link-editor will allocate common symbols at the end of the "__common"
 * section in the "__DATA" segment.  It will create the section and segment
 * if needed.
 */

/* The currently known segment names and the section names in those segments */

#define	SEG_PAGEZERO	"__PAGEZERO"	/* the pagezero segment which has no */
					/* protections and catches NULL */
					/* references for MH_EXECUTE files */


#define	SEG_TEXT	"__TEXT"	/* the tradition UNIX text segment */
#define	SECT_TEXT	"__text"	/* the real text part of the text */
					/* section no headers, and no padding */
#define SECT_FVMLIB_INIT0 "__fvmlib_init0"	/* the fvmlib initialization */
						/*  section */
#define SECT_FVMLIB_INIT1 "__fvmlib_init1"	/* the section following the */
					        /*  fvmlib initialization */
						/*  section */

#define	SEG_DATA	"__DATA"	/* the tradition UNIX data segment */
#define	SECT_DATA	"__data"	/* the real initialized data section */
					/* no padding, no bss overlap */
#define	SECT_BSS	"__bss"		/* the real uninitialized data section*/
					/* no padding */
#define SECT_COMMON	"__common"	/* the section common symbols are */
					/* allocated in by the link editor */

#define	SEG_OBJC	"__OBJC"	/* objective-C runtime segment */
#define SECT_OBJC_SYMBOLS "__symbol_table"	/* symbol table */
#define SECT_OBJC_MODULES "__module_info"	/* module information */
#define SECT_OBJC_STRINGS "__selector_strs"	/* string table */
#define SECT_OBJC_REFS "__selector_refs"	/* string table */

#define	SEG_ICON	 "__ICON"	/* the icon segment */
#define	SECT_ICON_HEADER "__header"	/* the icon headers */
#define	SECT_ICON_TIFF   "__tiff"	/* the icons in tiff format */

#define	SEG_LINKEDIT	"__LINKEDIT"	/* the segment containing all structs */
					/* created and maintained by the link */
					/* editor.  Created with -seglinkedit */
					/* option to ld(1) for MH_EXECUTE and */
					/* FVMLIB file types only */

#define SEG_UNIXSTACK	"__UNIXSTACK"	/* the unix stack segment */

#define SEG_IMPORT	"__IMPORT"	/* the segment for the self (dyld) */

/*
 * The entry_point_command is a replacement for thread_command.
 * It is used for main executables to specify the location (file offset)
 * of main().  If -stack_size was used at link time, the stacksize
 * field will contain the stack size need for the main thread.
 */
struct entry_point_command {
    uint32_t  cmd;	/* LC_MAIN only used in MH_EXECUTE filetypes */
    uint32_t  cmdsize;	/* 24 */
    uint64_t  entryoff;	/* file (__TEXT) offset of main() */
    uint64_t  stacksize;/* if not zero, initial stack size */
};

#endif /* MACH_O */