/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 1999-2010 Apple Inc. All Rights Reserved.
*
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ * @APPLE_LICENSE_HEADER_END@
*/
#ifndef _MACHO_LOADER_H_
#define _MACHO_LOADER_H_
/*
* This file describes the format of mach object files.
*/
+#include <stdint.h>
/*
* <mach/machine.h> is needed here for the cpu_type_t and cpu_subtype_t types
* states and the structures of those flavors for each machine.
*/
#include <mach/machine/thread_status.h>
+#include <architecture/byte_order.h>
/*
- * The mach header appears at the very beginning of the object file; it
- * is the same for both 32-bit and 64-bit architectures.
+ * 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 */
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.
uint32_t reserved; /* reserved */
};
-/* Constant for the magic field of the mach_header (32-bit architectures) */
-#define MH_MAGIC 0xfeedface /* the mach magic number */
-#define MH_CIGAM 0xcefaedfe
-
/* 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
-
-/* Constants for the cmd field of new load commands, the type */
-#define LC_SEGMENT_64 0x19 /* 64-bit segment of this file to be mapped */
-#define LC_ROUTINES_64 0x1a /* 64-bit image routines */
-
+#define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */
+#define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */
/*
* The layout of the file depends on the filetype. For all but the MH_OBJECT
* assembler and input (and possibly output) of the link editor (the .o
* format). All sections are in one unnamed segment with no segment padding.
* This format is used as an executable format when the file is so small the
- * segment padding greatly increases it's size.
+ * segment padding greatly increases its size.
*
* The file type MH_PRELOAD is an executable format intended for things that
- * not executed under the kernel (proms, stand alones, kernels, etc). The
+ * are not executed under the kernel (proms, stand alones, kernels, etc). The
* format can be executed under the kernel but may demand paged it and not
* preload it before execution.
*
#define MH_FVMLIB 0x3 /* fixed VM shared library file */
#define MH_CORE 0x4 /* core file */
#define MH_PRELOAD 0x5 /* preloaded executable file */
-#define MH_DYLIB 0x6 /* dynamicly bound shared library file*/
+#define MH_DYLIB 0x6 /* dynamically bound shared library */
#define MH_DYLINKER 0x7 /* dynamic link editor */
-#define MH_BUNDLE 0x8 /* dynamicly bound bundle file */
+#define MH_BUNDLE 0x8 /* dynamically bound bundle file */
+#define MH_DYLIB_STUB 0x9 /* shared library stub for static */
+ /* linking only, no section contents */
+#define MH_DSYM 0xa /* companion file with only debug */
+ /* sections */
+#define MH_KEXT_BUNDLE 0xb /* x86_64 kexts */
/* Constants for the flags field of the mach_header */
#define MH_NOUNDEFS 0x1 /* the object file has no undefined
- references, can be executed */
+ references */
#define MH_INCRLINK 0x2 /* the object file is the output of an
incremental link against a base file
and can't be link edited again */
#define MH_BINDATLOAD 0x8 /* the object file's undefined
references are bound by the dynamic
linker when loaded. */
-#define MH_PREBOUND 0x10 /* the file has it's dynamic undefined
+#define MH_PREBOUND 0x10 /* the file has its dynamic undefined
references prebound. */
+#define MH_SPLIT_SEGS 0x20 /* the file has its read-only and
+ read-write segments split */
+#define MH_LAZY_INIT 0x40 /* the shared library init routine is
+ to be run lazily via catching memory
+ faults to its writeable segments
+ (obsolete) */
+#define MH_TWOLEVEL 0x80 /* the image is using two-level name
+ space bindings */
+#define MH_FORCE_FLAT 0x100 /* the executable is forcing all images
+ to use flat name space bindings */
+#define MH_NOMULTIDEFS 0x200 /* this umbrella guarantees no multiple
+ defintions of symbols in its
+ sub-images so the two-level namespace
+ hints can always be used. */
+#define MH_NOFIXPREBINDING 0x400 /* do not have dyld notify the
+ prebinding agent about this
+ executable */
+#define MH_PREBINDABLE 0x800 /* the binary is not prebound but can
+ have its prebinding redone. only used
+ when MH_PREBOUND is not set. */
+#define MH_ALLMODSBOUND 0x1000 /* 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. */
+#define MH_SUBSECTIONS_VIA_SYMBOLS 0x2000/* safe to divide up the sections into
+ sub-sections via symbols for dead
+ code stripping */
+#define MH_CANONICAL 0x4000 /* the binary has been canonicalized
+ via the unprebind operation */
+#define MH_WEAK_DEFINES 0x8000 /* the final linked image contains
+ external weak symbols */
+#define MH_BINDS_TO_WEAK 0x10000 /* the final linked image uses
+ weak symbols */
+
#define MH_ALLOW_STACK_EXECUTION 0x20000/* When this bit is set, all stacks
in the task will be given stack
execution privilege. Only used in
MH_EXECUTE filetypes. */
+#define MH_ROOT_SAFE 0x40000 /* When this bit is set, the binary
+ declares it is safe for use in
+ processes with uid zero */
+
+#define MH_SETUID_SAFE 0x80000 /* When this bit is set, the binary
+ declares it is safe for use in
+ processes when issetugid() is true */
+
+#define MH_NO_REEXPORTED_DYLIBS 0x100000 /* When this bit is set on a dylib,
+ the static linker does not need to
+ examine dependent dylibs to see
+ if any are re-exported */
+#define MH_PIE 0x200000 /* When this bit is set, the OS will
+ load the main executable at a
+ random address. Only used in
+ MH_EXECUTE filetypes. */
+#define MH_DEAD_STRIPPABLE_DYLIB 0x400000 /* Only for use on dylibs. When
+ linking against a dylib that
+ has this bit set, the static linker
+ will automatically not create a
+ LC_LOAD_DYLIB load command to the
+ dylib if no symbols are being
+ referenced from the dylib. */
+#define MH_HAS_TLV_DESCRIPTORS 0x800000 /* Contains a section of type
+ S_THREAD_LOCAL_VARIABLES */
+
+#define MH_NO_HEAP_EXECUTION 0x1000000 /* When this bit is set, the OS will
+ run the main executable with
+ a non-executable heap even on
+ platforms (e.g. i386) that don't
+ require it. Only used in MH_EXECUTE
+ filetypes. */
/*
* The load commands directly follow the mach_header. The total size of all
* pointer of the current load command. The cmdsize for 32-bit architectures
* MUST be a multiple of 4 bytes and for 64-bit architectures MUST be a multiple
* of 8 bytes (these are forever the maximum alignment of any load commands).
- * sizeof(long) (this is forever the maximum alignment of any load commands).
* The padded bytes must be zero. All tables in the object file must also
* follow these rules so the file can be memory mapped. Otherwise the pointers
* to these tables will not work well or at all on some machines. With all
* padding zeroed like objects will compare byte for byte.
*/
struct load_command {
- unsigned long cmd; /* type of load command */
- unsigned long cmdsize; /* total size of command in bytes */
+ uint32_t cmd; /* type of load command */
+ uint32_t cmdsize; /* total size of command in 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_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 dynamicly linked shared library */
-#define LC_ID_DYLIB 0xd /* dynamicly linked shared lib identification */
+#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 dynamicly */
+#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 */
+#define LC_ENCRYPTION_INFO_64 0x2C /* 64-bit encrypted segment information */
+
/*
* A variable length string in a load command is represented by an lc_str
* the offset is from the start of the load command structure. The size
* of the string is reflected in the cmdsize field of the load command.
* Once again any padded bytes to bring the cmdsize field to a multiple
- * of sizeof(long) must be zero.
+ * of 4 bytes must be zero.
*/
union lc_str {
- unsigned long offset; /* offset to the string */
+ uint32_t offset; /* offset to the string */
+#ifndef __LP64__
char *ptr; /* pointer to the string */
+#endif
};
/*
* section structures directly follow the segment command and their size is
* reflected in cmdsize.
*/
-struct segment_command { /* for 32-bit architectures */
- unsigned long cmd; /* LC_SEGMENT */
- unsigned long cmdsize; /* includes sizeof section structs */
+struct segment_command { /* for 32-bit architectures */
+ uint32_t cmd; /* LC_SEGMENT */
+ uint32_t cmdsize; /* includes sizeof section structs */
char segname[16]; /* segment name */
- unsigned long vmaddr; /* memory address of this segment */
- unsigned long vmsize; /* memory size of this segment */
- unsigned long fileoff; /* file offset of this segment */
- unsigned long filesize; /* amount to map from the file */
+ 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 */
- unsigned long nsects; /* number of sections in segment */
- unsigned long flags; /* flags */
+ uint32_t nsects; /* number of sections in segment */
+ uint32_t flags; /* flags */
};
/*
* 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 */
+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 */
uint32_t flags; /* flags */
};
-
/* Constants for the flags field of the segment_command */
#define SG_HIGHVM 0x1 /* the file contents for this segment is for
the high part of the VM space, the low part
#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
+ segment starts at file offset 0, the
+ first page of the segment is not
+ protected. All other pages of the
+ segment are protected. */
/*
* A segment is made up of zero or more sections. Non-MH_OBJECT files have
* all of their segments with the proper sections in each, and padded to the
* specified segment alignment when produced by the link editor. The first
* segment of a MH_EXECUTE and MH_FVMLIB format file contains the mach_header
- * and load commands of the object file before it's first section. The zero
+ * and load commands of the object file before its first section. The zero
* fill sections are always last in their segment (in all formats). This
* allows the zeroed segment padding to be mapped into memory where zero fill
* sections might be. The gigabyte zero fill sections, those with the section
* type S_GB_ZEROFILL, can only be in a segment with sections of this type.
* These segments are then placed after all other segments.
*
- * The MH_OBJECT format has all of it's sections in one segment for
+ * The MH_OBJECT format has all of its sections in one segment for
* compactness. There is no padding to a specified segment boundary and the
* mach_header and load commands are not part of the segment.
*
* fields of the section structure for mach object files is described in the
* header file <reloc.h>.
*/
-struct section { /* for 32-bit architectures */
+struct section { /* for 32-bit architectures */
char sectname[16]; /* name of this section */
char segname[16]; /* segment this section goes in */
- unsigned long addr; /* memory address of this section */
- unsigned long size; /* size in bytes of this section */
- unsigned long offset; /* file offset of this section */
- unsigned long align; /* section alignment (power of 2) */
- unsigned long reloff; /* file offset of relocation entries */
- unsigned long nreloc; /* number of relocation entries */
- unsigned long flags; /* flags (section type and attributes)*/
- unsigned long reserved1; /* reserved */
- unsigned long reserved2; /* reserved */
+ uint32_t addr; /* memory address of this section */
+ uint32_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) */
};
struct section_64 { /* for 64-bit architectures */
uint32_t reserved3; /* reserved */
};
-
/*
* The flags field of a section structure is separated into two parts a section
* type and section attributes. The section types are mutually exclusive (it
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 */
+/*
+ * Section types to support thread local variables
+ */
+#define S_THREAD_LOCAL_REGULAR 0x11 /* template of initial
+ values for TLVs */
+#define S_THREAD_LOCAL_ZEROFILL 0x12 /* template of initial
+ values for TLVs */
+#define S_THREAD_LOCAL_VARIABLES 0x13 /* TLV descriptors */
+#define S_THREAD_LOCAL_VARIABLE_POINTERS 0x14 /* pointers to TLV
+ descriptors */
+#define S_THREAD_LOCAL_INIT_FUNCTION_POINTERS 0x15 /* functions to call
+ to initialize TLV
+ values */
+
/*
* 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 SECT_OBJC_STRINGS "__selector_strs" /* string table */
#define SECT_OBJC_REFS "__selector_refs" /* string table */
-#define SEG_ICON "__ICON" /* the NeXT icon segment */
+#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_UNIXSTACK "__UNIXSTACK" /* the unix stack segment */
+#define SEG_IMPORT "__IMPORT" /* the segment for the self (dyld) */
+ /* modifing code stubs that has read, */
+ /* write and execute permissions */
+
/*
* Fixed virtual memory shared libraries are identified by two things. The
* target pathname (the name of the library as found for execution), and the
* minor version number. The address of where the headers are loaded is in
- * header_addr.
+ * header_addr. (THIS IS OBSOLETE and no longer supported).
*/
struct fvmlib {
union lc_str name; /* library's target pathname */
- unsigned long minor_version; /* library's minor version number */
- unsigned long header_addr; /* library's header address */
+ uint32_t minor_version; /* library's minor version number */
+ uint32_t header_addr; /* library's header address */
};
/*
* contains a fvmlib_command (cmd == LC_IDFVMLIB) to identify the library.
* An object that uses a fixed virtual shared library also contains a
* fvmlib_command (cmd == LC_LOADFVMLIB) for each library it uses.
+ * (THIS IS OBSOLETE and no longer supported).
*/
struct fvmlib_command {
- unsigned long cmd; /* LC_IDFVMLIB or LC_LOADFVMLIB */
- unsigned long cmdsize; /* includes pathname string */
+ uint32_t cmd; /* LC_IDFVMLIB or LC_LOADFVMLIB */
+ uint32_t cmdsize; /* includes pathname string */
struct fvmlib fvmlib; /* the library identification */
};
*/
struct dylib {
union lc_str name; /* library's path name */
- unsigned long timestamp; /* library's build time stamp */
- unsigned long current_version; /* library's current version number */
- unsigned long compatibility_version;/* library's compatibility vers number*/
+ uint32_t timestamp; /* library's build time stamp */
+ uint32_t current_version; /* library's current version number */
+ uint32_t compatibility_version; /* library's compatibility vers number*/
};
/*
- * A dynamicly linked shared library (filetype == MH_DYLIB in the mach header)
+ * A dynamically linked shared library (filetype == MH_DYLIB in the mach header)
* contains a dylib_command (cmd == LC_ID_DYLIB) to identify the library.
- * An object that uses a dynamicly linked shared library also contains a
- * dylib_command (cmd == LC_LOAD_DYLIB) for each library it uses.
+ * An object that uses a dynamically linked shared library also contains a
+ * dylib_command (cmd == LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or
+ * LC_REEXPORT_DYLIB) for each library it uses.
*/
struct dylib_command {
- unsigned long cmd; /* LC_ID_DYLIB or LC_LOAD_DYLIB */
- unsigned long cmdsize; /* includes pathname string */
+ uint32_t cmd; /* LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB,
+ LC_REEXPORT_DYLIB */
+ uint32_t cmdsize; /* includes pathname string */
struct dylib dylib; /* the library identification */
};
/*
- * A program (filetype == MH_EXECUTE) or bundle (filetype == MH_BUNDLE) that is
- * prebound to it's dynamic libraries has one of these for each library that
+ * A dynamically linked shared library may be a subframework of an umbrella
+ * framework. If so it will be linked with "-umbrella umbrella_name" where
+ * Where "umbrella_name" is the name of the umbrella framework. A subframework
+ * can only be linked against by its umbrella framework or other subframeworks
+ * that are part of the same umbrella framework. Otherwise the static link
+ * editor produces an error and states to link against the umbrella framework.
+ * The name of the umbrella framework for subframeworks is recorded in the
+ * following structure.
+ */
+struct sub_framework_command {
+ uint32_t cmd; /* LC_SUB_FRAMEWORK */
+ uint32_t cmdsize; /* includes umbrella string */
+ union lc_str umbrella; /* the umbrella framework name */
+};
+
+/*
+ * For dynamically linked shared libraries that are subframework of an umbrella
+ * framework they can allow clients other than the umbrella framework or other
+ * subframeworks in the same umbrella framework. To do this the subframework
+ * is built with "-allowable_client client_name" and an LC_SUB_CLIENT load
+ * command is created for each -allowable_client flag. The client_name is
+ * usually a framework name. It can also be a name used for bundles clients
+ * where the bundle is built with "-client_name client_name".
+ */
+struct sub_client_command {
+ uint32_t cmd; /* LC_SUB_CLIENT */
+ uint32_t cmdsize; /* includes client string */
+ union lc_str client; /* the client name */
+};
+
+/*
+ * A dynamically linked shared library may be a sub_umbrella of an umbrella
+ * framework. If so it will be linked with "-sub_umbrella umbrella_name" where
+ * Where "umbrella_name" is the name of the sub_umbrella framework. When
+ * staticly linking when -twolevel_namespace is in effect a twolevel namespace
+ * umbrella framework will only cause its subframeworks and those frameworks
+ * listed as sub_umbrella frameworks to be implicited linked in. Any other
+ * dependent dynamic libraries will not be linked it when -twolevel_namespace
+ * is in effect. The primary library recorded by the static linker when
+ * resolving a symbol in these libraries will be the umbrella framework.
+ * Zero or more sub_umbrella frameworks may be use by an umbrella framework.
+ * The name of a sub_umbrella framework is recorded in the following structure.
+ */
+struct sub_umbrella_command {
+ uint32_t cmd; /* LC_SUB_UMBRELLA */
+ uint32_t cmdsize; /* includes sub_umbrella string */
+ union lc_str sub_umbrella; /* the sub_umbrella framework name */
+};
+
+/*
+ * A dynamically linked shared library may be a sub_library of another shared
+ * library. If so it will be linked with "-sub_library library_name" where
+ * Where "library_name" is the name of the sub_library shared library. When
+ * staticly linking when -twolevel_namespace is in effect a twolevel namespace
+ * shared library will only cause its subframeworks and those frameworks
+ * listed as sub_umbrella frameworks and libraries listed as sub_libraries to
+ * be implicited linked in. Any other dependent dynamic libraries will not be
+ * linked it when -twolevel_namespace is in effect. The primary library
+ * recorded by the static linker when resolving a symbol in these libraries
+ * will be the umbrella framework (or dynamic library). Zero or more sub_library
+ * shared libraries may be use by an umbrella framework or (or dynamic library).
+ * The name of a sub_library framework is recorded in the following structure.
+ * For example /usr/lib/libobjc_profile.A.dylib would be recorded as "libobjc".
+ */
+struct sub_library_command {
+ uint32_t cmd; /* LC_SUB_LIBRARY */
+ uint32_t cmdsize; /* includes sub_library string */
+ union lc_str sub_library; /* the sub_library name */
+};
+
+/*
+ * A program (filetype == MH_EXECUTE) that is
+ * prebound to its dynamic libraries has one of these for each library that
* the static linker used in prebinding. It contains a bit vector for the
* modules in the library. The bits indicate which modules are bound (1) and
* which are not (0) from the library. The bit for module 0 is the low bit
* (linked_modules[N/8] >> N%8) & 1
*/
struct prebound_dylib_command {
- unsigned long cmd; /* LC_PREBOUND_DYLIB */
- unsigned long cmdsize; /* includes strings */
+ uint32_t cmd; /* LC_PREBOUND_DYLIB */
+ uint32_t cmdsize; /* includes strings */
union lc_str name; /* library's path name */
- unsigned long nmodules; /* number of modules in library */
+ uint32_t nmodules; /* number of modules in library */
union lc_str linked_modules; /* bit vector of linked modules */
};
* the name of the dynamic linker (LC_LOAD_DYLINKER). And a dynamic linker
* contains a dylinker_command to identify the dynamic linker (LC_ID_DYLINKER).
* A file can have at most one of these.
+ * This struct is also used for the LC_DYLD_ENVIRONMENT load command and
+ * contains string for dyld to treat like environment variable.
*/
struct dylinker_command {
- unsigned long cmd; /* LC_ID_DYLINKER or LC_LOAD_DYLINKER */
- unsigned long cmdsize; /* includes pathname string */
+ uint32_t cmd; /* LC_ID_DYLINKER, LC_LOAD_DYLINKER or
+ LC_DYLD_ENVIRONMENT */
+ uint32_t cmdsize; /* includes pathname string */
union lc_str name; /* dynamic linker's path name */
};
* use in the thread state primitives. The machine specific data structures
* follow the struct thread_command as follows.
* Each flavor of machine specific data structure is preceded by an unsigned
- * long constant for the flavor of that data structure, an unsigned long
+ * long constant for the flavor of that data structure, an uint32_t
* that is the count of longs of the size of the state data structure and then
* the state data structure follows. This triple may be repeated for many
* flavors. The constants for the flavors, counts and state data structure
* definitions are expected to be in the header file <machine/thread_status.h>.
* These machine specific data structures sizes must be multiples of
- * sizeof(long). The cmdsize reflects the total size of the thread_command
+ * 4 bytes The cmdsize reflects the total size of the thread_command
* and all of the sizes of the constants for the flavors, counts and state
* data structures.
*
* and environment variables are copied onto that stack.
*/
struct thread_command {
- unsigned long cmd; /* LC_THREAD or LC_UNIXTHREAD */
- unsigned long cmdsize; /* total size of this command */
- /* unsigned long flavor flavor of thread state */
- /* unsigned long count count of longs in thread state */
+ uint32_t cmd; /* LC_THREAD or LC_UNIXTHREAD */
+ uint32_t cmdsize; /* total size of this command */
+ /* uint32_t flavor flavor of thread state */
+ /* uint32_t count count of longs in thread state */
/* struct XXX_thread_state state thread state for this flavor */
/* ... */
};
+/*
+ * The routines command contains the address of the dynamic shared library
+ * initialization routine and an index into the module table for the module
+ * that defines the routine. Before any modules are used from the library the
+ * dynamic linker fully binds the module that defines the initialization routine
+ * and then calls it. This gets called before any module initialization
+ * routines (used for C++ static constructors) in the library.
+ */
+struct routines_command { /* for 32-bit architectures */
+ uint32_t cmd; /* LC_ROUTINES */
+ uint32_t cmdsize; /* total size of this command */
+ uint32_t init_address; /* address of initialization routine */
+ uint32_t init_module; /* index into the module table that */
+ /* the init routine is defined in */
+ uint32_t reserved1;
+ uint32_t reserved2;
+ uint32_t reserved3;
+ uint32_t reserved4;
+ uint32_t reserved5;
+ uint32_t reserved6;
+};
+
+/*
+ * The 64-bit routines command. Same use as above.
+ */
+struct routines_command_64 { /* for 64-bit architectures */
+ uint32_t cmd; /* LC_ROUTINES_64 */
+ uint32_t cmdsize; /* total size of this command */
+ uint64_t init_address; /* address of initialization routine */
+ uint64_t init_module; /* index into the module table that */
+ /* the init routine is defined in */
+ uint64_t reserved1;
+ uint64_t reserved2;
+ uint64_t reserved3;
+ uint64_t reserved4;
+ uint64_t reserved5;
+ uint64_t reserved6;
+};
+
/*
* The symtab_command contains the offsets and sizes of the link-edit 4.3BSD
* "stab" style symbol table information as described in the header files
* <nlist.h> and <stab.h>.
*/
struct symtab_command {
- unsigned long cmd; /* LC_SYMTAB */
- unsigned long cmdsize; /* sizeof(struct symtab_command) */
- unsigned long symoff; /* symbol table offset */
- unsigned long nsyms; /* number of symbol table entries */
- unsigned long stroff; /* string table offset */
- unsigned long strsize; /* string table size in bytes */
+ uint32_t cmd; /* LC_SYMTAB */
+ uint32_t cmdsize; /* sizeof(struct symtab_command) */
+ uint32_t symoff; /* symbol table offset */
+ uint32_t nsyms; /* number of symbol table entries */
+ uint32_t stroff; /* string table offset */
+ uint32_t strsize; /* string table size in bytes */
};
/*
* This is the second set of the symbolic information which is used to support
- * the data structures for the dynamicly link editor.
+ * the data structures for the dynamically link editor.
*
* The original set of symbolic information in the symtab_command which contains
* the symbol and string tables must also be present when this load command is
* into three groups of symbols:
* local symbols (static and debugging symbols) - grouped by module
* defined external symbols - grouped by module (sorted by name if not lib)
- * undefined external symbols (sorted by name)
+ * undefined external symbols (sorted by name if MH_BINDATLOAD is not set,
+ * and in order the were seen by the static
+ * linker if MH_BINDATLOAD is set)
* In this load command there are offsets and counts to each of the three groups
* of symbols.
*
* reference symbol table
* indirect symbol table
* The first three tables above (the table of contents, module table and
- * reference symbol table) are only present if the file is a dynamicly linked
+ * reference symbol table) are only present if the file is a dynamically linked
* shared library. For executable and object modules, which are files
* containing only one module, the information that would be in these three
* tables is determined as follows:
* file is part of the module.
* reference symbol table - is the defined and undefined external symbols
*
- * For dynamicly linked shared library files this load command also contains
+ * For dynamically linked shared library files this load command also contains
* offsets and sizes to the pool of relocation entries for all sections
* separated into two groups:
* external relocation entries
* off the section structures.
*/
struct dysymtab_command {
- unsigned long cmd; /* LC_DYSYMTAB */
- unsigned long cmdsize; /* sizeof(struct dysymtab_command) */
+ uint32_t cmd; /* LC_DYSYMTAB */
+ uint32_t cmdsize; /* sizeof(struct dysymtab_command) */
/*
* The symbols indicated by symoff and nsyms of the LC_SYMTAB load command
*
* The last two groups are used by the dynamic binding process to do the
* binding (indirectly through the module table and the reference symbol
- * table when this is a dynamicly linked shared library file).
+ * table when this is a dynamically linked shared library file).
*/
- unsigned long ilocalsym; /* index to local symbols */
- unsigned long nlocalsym; /* number of local symbols */
+ uint32_t ilocalsym; /* index to local symbols */
+ uint32_t nlocalsym; /* number of local symbols */
- unsigned long iextdefsym; /* index to externally defined symbols */
- unsigned long nextdefsym; /* number of externally defined symbols */
+ uint32_t iextdefsym;/* index to externally defined symbols */
+ uint32_t nextdefsym;/* number of externally defined symbols */
- unsigned long iundefsym; /* index to undefined symbols */
- unsigned long nundefsym; /* number of undefined symbols */
+ uint32_t iundefsym; /* index to undefined symbols */
+ uint32_t nundefsym; /* number of undefined symbols */
/*
* For the for the dynamic binding process to find which module a symbol
* is defined in the table of contents is used (analogous to the ranlib
* structure in an archive) which maps defined external symbols to modules
- * they are defined in. This exists only in a dynamicly linked shared
+ * they are defined in. This exists only in a dynamically linked shared
* library file. For executable and object modules the defined external
* symbols are sorted by name and is use as the table of contents.
*/
- unsigned long tocoff; /* file offset to table of contents */
- unsigned long ntoc; /* number of entries in table of contents */
+ uint32_t tocoff; /* file offset to table of contents */
+ uint32_t ntoc; /* number of entries in table of contents */
/*
* To support dynamic binding of "modules" (whole object files) the symbol
* table must reflect the modules that the file was created from. This is
* done by having a module table that has indexes and counts into the merged
* tables for each module. The module structure that these two entries
- * refer to is described below. This exists only in a dynamicly linked
+ * refer to is described below. This exists only in a dynamically linked
* shared library file. For executable and object modules the file only
* contains one module so everything in the file belongs to the module.
*/
- unsigned long modtaboff; /* file offset to module table */
- unsigned long nmodtab; /* number of module table entries */
+ uint32_t modtaboff; /* file offset to module table */
+ uint32_t nmodtab; /* number of module table entries */
/*
* To support dynamic module binding the module structure for each module
* indicates the external references (defined and undefined) each module
* makes. For each module there is an offset and a count into the
* reference symbol table for the symbols that the module references.
- * This exists only in a dynamicly linked shared library file. For
+ * This exists only in a dynamically linked shared library file. For
* executable and object modules the defined external symbols and the
* undefined external symbols indicates the external references.
*/
- unsigned long extrefsymoff; /* offset to referenced symbol table */
- unsigned long nextrefsyms; /* number of referenced symbol table entries */
+ uint32_t extrefsymoff; /* offset to referenced symbol table */
+ uint32_t nextrefsyms; /* number of referenced symbol table entries */
/*
* The sections that contain "symbol pointers" and "routine stubs" have
* the symbol table to the symbol that the pointer or stub is referring to.
* The indirect symbol table is ordered to match the entries in the section.
*/
- unsigned long indirectsymoff; /* file offset to the indirect symbol table */
- unsigned long nindirectsyms; /* number of indirect symbol table entries */
+ uint32_t indirectsymoff; /* file offset to the indirect symbol table */
+ uint32_t nindirectsyms; /* number of indirect symbol table entries */
/*
* To support relocating an individual module in a library file quickly the
* this requires the r_address field to be something other than a section
* offset to identify the item to be relocated. In this case r_address is
* set to the offset from the vmaddr of the first LC_SEGMENT command.
+ * For MH_SPLIT_SEGS images r_address is set to the the offset from the
+ * vmaddr of the first read-write LC_SEGMENT command.
*
* The relocation entries are grouped by module and the module table
* entries have indexes and counts into them for the group of external
* remaining external relocation entries for them (for merged sections
* remaining relocation entries must be local).
*/
- unsigned long extreloff; /* offset to external relocation entries */
- unsigned long nextrel; /* number of external relocation entries */
+ uint32_t extreloff; /* offset to external relocation entries */
+ uint32_t nextrel; /* number of external relocation entries */
/*
* All the local relocation entries are grouped together (they are not
* grouped by their module since they are only used if the object is moved
* from it staticly link edited address).
*/
- unsigned long locreloff; /* offset to local relocation entries */
- unsigned long nlocrel; /* number of local relocation entries */
+ uint32_t locreloff; /* offset to local relocation entries */
+ uint32_t nlocrel; /* number of local relocation entries */
};
/* a table of contents entry */
struct dylib_table_of_contents {
- unsigned long symbol_index; /* the defined external symbol
+ uint32_t symbol_index; /* the defined external symbol
(index into the symbol table) */
- unsigned long module_index; /* index into the module table this symbol
+ uint32_t module_index; /* index into the module table this symbol
is defined in */
};
/* a module table entry */
struct dylib_module {
- unsigned long module_name; /* the module name (index into string table) */
+ uint32_t module_name; /* the module name (index into string table) */
- unsigned long iextdefsym; /* index into externally defined symbols */
- unsigned long nextdefsym; /* number of externally defined symbols */
- unsigned long irefsym; /* index into reference symbol table */
- unsigned long nrefsym; /* number of reference symbol table entries */
- unsigned long ilocalsym; /* index into symbols for local symbols */
- unsigned long nlocalsym; /* number of local symbols */
+ uint32_t iextdefsym; /* index into externally defined symbols */
+ uint32_t nextdefsym; /* number of externally defined symbols */
+ uint32_t irefsym; /* index into reference symbol table */
+ uint32_t nrefsym; /* number of reference symbol table entries */
+ uint32_t ilocalsym; /* index into symbols for local symbols */
+ uint32_t nlocalsym; /* number of local symbols */
- unsigned long iextrel; /* index into external relocation entries */
- unsigned long nextrel; /* number of external relocation entries */
+ uint32_t iextrel; /* index into external relocation entries */
+ uint32_t nextrel; /* number of external relocation entries */
- unsigned long iinit; /* index into the init section */
- unsigned long ninit; /* number of init section entries */
+ uint32_t iinit_iterm; /* low 16 bits are the index into the init
+ section, high 16 bits are the index into
+ the term section */
+ uint32_t ninit_nterm; /* low 16 bits are the number of init section
+ entries, high 16 bits are the number of
+ term section entries */
- unsigned long /* for this module address of the start of */
+ uint32_t /* for this module address of the start of */
objc_module_info_addr; /* the (__OBJC,__module_info) section */
- unsigned long /* for this module size of */
+ uint32_t /* for this module size of */
objc_module_info_size; /* the (__OBJC,__module_info) section */
};
/* a 64-bit module table entry */
struct dylib_module_64 {
- uint32_t module_name; /* the module name (index into string table) */
+ uint32_t module_name; /* the module name (index into string table) */
- uint32_t iextdefsym; /* index into externally defined symbols */
- uint32_t nextdefsym; /* number of externally defined symbols */
- uint32_t irefsym; /* index into reference symbol table */
- uint32_t nrefsym; /* number of reference symbol table entries */
- uint32_t ilocalsym; /* index into symbols for local symbols */
- uint32_t nlocalsym; /* number of local symbols */
+ uint32_t iextdefsym; /* index into externally defined symbols */
+ uint32_t nextdefsym; /* number of externally defined symbols */
+ uint32_t irefsym; /* index into reference symbol table */
+ uint32_t nrefsym; /* number of reference symbol table entries */
+ uint32_t ilocalsym; /* index into symbols for local symbols */
+ uint32_t nlocalsym; /* number of local symbols */
- uint32_t iextrel; /* index into external relocation entries */
- uint32_t nextrel; /* number of external relocation entries */
+ uint32_t iextrel; /* index into external relocation entries */
+ uint32_t nextrel; /* number of external relocation entries */
- uint32_t iinit_iterm; /* low 16 bits are the index into the init
+ uint32_t iinit_iterm; /* low 16 bits are the index into the init
section, high 16 bits are the index into
the term section */
- uint32_t ninit_nterm; /* low 16 bits are the number of init section
- entries, high 16 bits are the number of
- term section entries */
-
- uint32_t /* for this module size of the */
- objc_module_info_size; /* (__OBJC,__module_info) section */
- uint64_t /* for this module address of the start of */
- objc_module_info_addr; /* the (__OBJC,__module_info) section */
+ uint32_t ninit_nterm; /* low 16 bits are the number of init section
+ entries, high 16 bits are the number of
+ term section entries */
+
+ uint32_t /* for this module size of */
+ objc_module_info_size; /* the (__OBJC,__module_info) section */
+ uint64_t /* for this module address of the start of */
+ objc_module_info_addr; /* the (__OBJC,__module_info) section */
};
-
/*
* The entries in the reference symbol table are used when loading the module
* (both by the static and dynamic link editors) and if the module is unloaded
* <mach-o/nlist.h> as they are also used for symbol table entries.
*/
struct dylib_reference {
- unsigned long isym:24, /* index into the symbol table */
+ uint32_t isym:24, /* index into the symbol table */
flags:8; /* flags to indicate the type of reference */
};
+/*
+ * The twolevel_hints_command contains the offset and number of hints in the
+ * two-level namespace lookup hints table.
+ */
+struct twolevel_hints_command {
+ uint32_t cmd; /* LC_TWOLEVEL_HINTS */
+ uint32_t cmdsize; /* sizeof(struct twolevel_hints_command) */
+ uint32_t offset; /* offset to the hint table */
+ uint32_t nhints; /* number of hints in the hint table */
+};
+
+/*
+ * The entries in the two-level namespace lookup hints table are twolevel_hint
+ * structs. These provide hints to the dynamic link editor where to start
+ * looking for an undefined symbol in a two-level namespace image. The
+ * isub_image field is an index into the sub-images (sub-frameworks and
+ * sub-umbrellas list) that made up the two-level image that the undefined
+ * symbol was found in when it was built by the static link editor. If
+ * isub-image is 0 the the symbol is expected to be defined in library and not
+ * in the sub-images. If isub-image is non-zero it is an index into the array
+ * of sub-images for the umbrella with the first index in the sub-images being
+ * 1. The array of sub-images is the ordered list of sub-images of the umbrella
+ * that would be searched for a symbol that has the umbrella recorded as its
+ * primary library. The table of contents index is an index into the
+ * library's table of contents. This is used as the starting point of the
+ * binary search or a directed linear search.
+ */
+struct twolevel_hint {
+ uint32_t
+ isub_image:8, /* index into the sub images */
+ itoc:24; /* index into the table of contents */
+};
+
+/*
+ * The prebind_cksum_command contains the value of the original check sum for
+ * prebound files or zero. When a prebound file is first created or modified
+ * for other than updating its prebinding information the value of the check sum
+ * is set to zero. When the file has it prebinding re-done and if the value of
+ * the check sum is zero the original check sum is calculated and stored in
+ * cksum field of this load command in the output file. If when the prebinding
+ * is re-done and the cksum field is non-zero it is left unchanged from the
+ * input file.
+ */
+struct prebind_cksum_command {
+ uint32_t cmd; /* LC_PREBIND_CKSUM */
+ uint32_t cmdsize; /* sizeof(struct prebind_cksum_command) */
+ uint32_t cksum; /* the check sum or zero */
+};
+
+/*
+ * The uuid load command contains a single 128-bit unique random number that
+ * identifies an object produced by the static link editor.
+ */
+struct uuid_command {
+ uint32_t cmd; /* LC_UUID */
+ uint32_t cmdsize; /* sizeof(struct uuid_command) */
+ uint8_t uuid[16]; /* the 128-bit uuid */
+};
+
+/*
+ * The rpath_command contains a path which at runtime should be added to
+ * the current run path used to find @rpath prefixed dylibs.
+ */
+struct rpath_command {
+ uint32_t cmd; /* LC_RPATH */
+ uint32_t cmdsize; /* includes string */
+ union lc_str path; /* path to add to run path */
+};
+
+/*
+ * The linkedit_data_command contains the offsets and sizes of a blob
+ * of data in the __LINKEDIT segment.
+ */
+struct linkedit_data_command {
+ uint32_t cmd; /* LC_CODE_SIGNATURE, LC_SEGMENT_SPLIT_INFO,
+ LC_FUNCTION_STARTS, LC_DATA_IN_CODE,
+ or LC_DYLIB_CODE_SIGN_DRS */
+ uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
+ uint32_t dataoff; /* file offset of data in __LINKEDIT segment */
+ uint32_t datasize; /* file size of data in __LINKEDIT segment */
+};
+
+/*
+ * The encryption_info_command contains the file offset and size of an
+ * of an encrypted segment.
+ */
+struct encryption_info_command {
+ uint32_t cmd; /* LC_ENCRYPTION_INFO */
+ uint32_t cmdsize; /* sizeof(struct encryption_info_command) */
+ uint32_t cryptoff; /* file offset of encrypted range */
+ uint32_t cryptsize; /* file size of encrypted range */
+ uint32_t cryptid; /* which enryption system,
+ 0 means not-encrypted yet */
+};
+
+/*
+ * The encryption_info_command_64 contains the file offset and size of an
+ * of an encrypted segment (for use in 64-bit targets).
+ */
+struct encryption_info_command_64 {
+ uint32_t cmd; /* LC_ENCRYPTION_INFO_64 */
+ uint32_t cmdsize; /* sizeof(struct encryption_info_command_64) */
+ uint32_t cryptoff; /* file offset of encrypted range */
+ uint32_t cryptsize; /* file size of encrypted range */
+ uint32_t cryptid; /* which enryption system,
+ 0 means not-encrypted yet */
+ uint32_t pad; /* padding to make this struct's size a multiple
+ of 8 bytes */
+};
+
+/*
+ * The version_min_command contains the min OS version on which this
+ * binary was built to run.
+ */
+struct version_min_command {
+ uint32_t cmd; /* LC_VERSION_MIN_MACOSX or
+ LC_VERSION_MIN_IPHONEOS */
+ uint32_t cmdsize; /* sizeof(struct min_version_command) */
+ uint32_t version; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
+ uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */
+};
+
+/*
+ * The dyld_info_command contains the file offsets and sizes of
+ * the new compressed form of the information dyld needs to
+ * load the image. This information is used by dyld on Mac OS X
+ * 10.6 and later. All information pointed to by this command
+ * is encoded using byte streams, so no endian swapping is needed
+ * to interpret it.
+ */
+struct dyld_info_command {
+ uint32_t cmd; /* LC_DYLD_INFO or LC_DYLD_INFO_ONLY */
+ uint32_t cmdsize; /* sizeof(struct dyld_info_command) */
+
+ /*
+ * Dyld rebases an image whenever dyld loads it at an address different
+ * from its preferred address. The rebase information is a stream
+ * of byte sized opcodes whose symbolic names start with REBASE_OPCODE_.
+ * Conceptually the rebase information is a table of tuples:
+ * <seg-index, seg-offset, type>
+ * The opcodes are a compressed way to encode the table by only
+ * encoding when a column changes. In addition simple patterns
+ * like "every n'th offset for m times" can be encoded in a few
+ * bytes.
+ */
+ uint32_t rebase_off; /* file offset to rebase info */
+ uint32_t rebase_size; /* size of rebase info */
+
+ /*
+ * Dyld binds an image during the loading process, if the image
+ * requires any pointers to be initialized to symbols in other images.
+ * The bind information is a stream of byte sized
+ * opcodes whose symbolic names start with BIND_OPCODE_.
+ * Conceptually the bind information is a table of tuples:
+ * <seg-index, seg-offset, type, symbol-library-ordinal, symbol-name, addend>
+ * The opcodes are a compressed way to encode the table by only
+ * encoding when a column changes. In addition simple patterns
+ * like for runs of pointers initialzed to the same value can be
+ * encoded in a few bytes.
+ */
+ uint32_t bind_off; /* file offset to binding info */
+ uint32_t bind_size; /* size of binding info */
+
+ /*
+ * Some C++ programs require dyld to unique symbols so that all
+ * images in the process use the same copy of some code/data.
+ * This step is done after binding. The content of the weak_bind
+ * info is an opcode stream like the bind_info. But it is sorted
+ * alphabetically by symbol name. This enable dyld to walk
+ * all images with weak binding information in order and look
+ * for collisions. If there are no collisions, dyld does
+ * no updating. That means that some fixups are also encoded
+ * in the bind_info. For instance, all calls to "operator new"
+ * are first bound to libstdc++.dylib using the information
+ * in bind_info. Then if some image overrides operator new
+ * that is detected when the weak_bind information is processed
+ * and the call to operator new is then rebound.
+ */
+ uint32_t weak_bind_off; /* file offset to weak binding info */
+ uint32_t weak_bind_size; /* size of weak binding info */
+
+ /*
+ * Some uses of external symbols do not need to be bound immediately.
+ * Instead they can be lazily bound on first use. The lazy_bind
+ * are contains a stream of BIND opcodes to bind all lazy symbols.
+ * Normal use is that dyld ignores the lazy_bind section when
+ * loading an image. Instead the static linker arranged for the
+ * lazy pointer to initially point to a helper function which
+ * pushes the offset into the lazy_bind area for the symbol
+ * needing to be bound, then jumps to dyld which simply adds
+ * the offset to lazy_bind_off to get the information on what
+ * to bind.
+ */
+ uint32_t lazy_bind_off; /* file offset to lazy binding info */
+ uint32_t lazy_bind_size; /* size of lazy binding infs */
+
+ /*
+ * The symbols exported by a dylib are encoded in a trie. This
+ * is a compact representation that factors out common prefixes.
+ * It also reduces LINKEDIT pages in RAM because it encodes all
+ * information (name, address, flags) in one small, contiguous range.
+ * The export area is a stream of nodes. The first node sequentially
+ * is the start node for the trie.
+ *
+ * Nodes for a symbol start with a uleb128 that is the length of
+ * the exported symbol information for the string so far.
+ * If there is no exported symbol, the node starts with a zero byte.
+ * If there is exported info, it follows the length.
+ *
+ * First is a uleb128 containing flags. Normally, it is followed by
+ * a uleb128 encoded offset which is location of the content named
+ * by the symbol from the mach_header for the image. If the flags
+ * is EXPORT_SYMBOL_FLAGS_REEXPORT, then following the flags is
+ * a uleb128 encoded library ordinal, then a zero terminated
+ * UTF8 string. If the string is zero length, then the symbol
+ * is re-export from the specified dylib with the same name.
+ * If the flags is EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER, then following
+ * the flags is two uleb128s: the stub offset and the resolver offset.
+ * The stub is used by non-lazy pointers. The resolver is used
+ * by lazy pointers and must be called to get the actual address to use.
+ *
+ * After the optional exported symbol information is a byte of
+ * how many edges (0-255) that this node has leaving it,
+ * followed by each edge.
+ * Each edge is a zero terminated UTF8 of the addition chars
+ * in the symbol, followed by a uleb128 offset for the node that
+ * edge points to.
+ *
+ */
+ uint32_t export_off; /* file offset to lazy binding info */
+ uint32_t export_size; /* size of lazy binding infs */
+};
+
+/*
+ * The following are used to encode rebasing information
+ */
+#define REBASE_TYPE_POINTER 1
+#define REBASE_TYPE_TEXT_ABSOLUTE32 2
+#define REBASE_TYPE_TEXT_PCREL32 3
+
+#define REBASE_OPCODE_MASK 0xF0
+#define REBASE_IMMEDIATE_MASK 0x0F
+#define REBASE_OPCODE_DONE 0x00
+#define REBASE_OPCODE_SET_TYPE_IMM 0x10
+#define REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x20
+#define REBASE_OPCODE_ADD_ADDR_ULEB 0x30
+#define REBASE_OPCODE_ADD_ADDR_IMM_SCALED 0x40
+#define REBASE_OPCODE_DO_REBASE_IMM_TIMES 0x50
+#define REBASE_OPCODE_DO_REBASE_ULEB_TIMES 0x60
+#define REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB 0x70
+#define REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB 0x80
+
+
+/*
+ * The following are used to encode binding information
+ */
+#define BIND_TYPE_POINTER 1
+#define BIND_TYPE_TEXT_ABSOLUTE32 2
+#define BIND_TYPE_TEXT_PCREL32 3
+
+#define BIND_SPECIAL_DYLIB_SELF 0
+#define BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE -1
+#define BIND_SPECIAL_DYLIB_FLAT_LOOKUP -2
+
+#define BIND_SYMBOL_FLAGS_WEAK_IMPORT 0x1
+#define BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION 0x8
+
+#define BIND_OPCODE_MASK 0xF0
+#define BIND_IMMEDIATE_MASK 0x0F
+#define BIND_OPCODE_DONE 0x00
+#define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM 0x10
+#define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB 0x20
+#define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
+#define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
+#define BIND_OPCODE_SET_TYPE_IMM 0x50
+#define BIND_OPCODE_SET_ADDEND_SLEB 0x60
+#define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
+#define BIND_OPCODE_ADD_ADDR_ULEB 0x80
+#define BIND_OPCODE_DO_BIND 0x90
+#define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB 0xA0
+#define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED 0xB0
+#define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xC0
+
+
+/*
+ * The following are used on the flags byte of a terminal node
+ * in the export information.
+ */
+#define EXPORT_SYMBOL_FLAGS_KIND_MASK 0x03
+#define EXPORT_SYMBOL_FLAGS_KIND_REGULAR 0x00
+#define EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL 0x01
+#define EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION 0x04
+#define EXPORT_SYMBOL_FLAGS_REEXPORT 0x08
+#define EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER 0x10
+
/*
* The symseg_command contains the offset and size of the GNU style
* symbol table information as described in the header file <symseg.h>.
* The symbol roots of the symbol segments must also be aligned properly
* in the file. So the requirement of keeping the offsets aligned to a
- * multiple of a sizeof(long) translates to the length field of the symbol
+ * multiple of a 4 bytes translates to the length field of the symbol
* roots also being a multiple of a long. Also the padding must again be
* zeroed. (THIS IS OBSOLETE and no longer supported).
*/
struct symseg_command {
- unsigned long cmd; /* LC_SYMSEG */
- unsigned long cmdsize; /* sizeof(struct symseg_command) */
- unsigned long offset; /* symbol segment offset */
- unsigned long size; /* symbol segment size in bytes */
+ uint32_t cmd; /* LC_SYMSEG */
+ uint32_t cmdsize; /* sizeof(struct symseg_command) */
+ uint32_t offset; /* symbol segment offset */
+ uint32_t size; /* symbol segment size in bytes */
};
/*
* The ident_command contains a free format string table following the
* ident_command structure. The strings are null terminated and the size of
- * the command is padded out with zero bytes to a multiple of sizeof(long).
+ * the command is padded out with zero bytes to a multiple of 4 bytes/
* (THIS IS OBSOLETE and no longer supported).
*/
struct ident_command {
- unsigned long cmd; /* LC_IDENT */
- unsigned long cmdsize; /* strings that follow this command */
+ uint32_t cmd; /* LC_IDENT */
+ uint32_t cmdsize; /* strings that follow this command */
};
/*
* The fvmfile_command contains a reference to a file to be loaded at the
- * specified virtual address. (Presently, this command is reserved for NeXT
+ * specified virtual address. (Presently, this command is reserved for
* internal use. The kernel ignores this command when loading a program into
* memory).
*/
struct fvmfile_command {
- unsigned long cmd; /* LC_FVMFILE */
- unsigned long cmdsize; /* includes pathname string */
+ uint32_t cmd; /* LC_FVMFILE */
+ uint32_t cmdsize; /* includes pathname string */
union lc_str name; /* files pathname */
- unsigned long header_addr; /* files virtual address */
+ uint32_t header_addr; /* files virtual address */
+};
+
+
+/*
+ * 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 */
+};
+
+
+/*
+ * The source_version_command is an optional load command containing
+ * the version of the sources used to build the binary.
+ */
+struct source_version_command {
+ uint32_t cmd; /* LC_SOURCE_VERSION */
+ uint32_t cmdsize; /* 16 */
+ uint64_t version; /* A.B.C.D.E packed as a24.b10.c10.d10.e10 */
+};
+
+
+/*
+ * The LC_DATA_IN_CODE load commands uses a linkedit_data_command
+ * to point to an array of data_in_code_entry entries. Each entry
+ * describes a range of data in a code section.
+ */
+struct data_in_code_entry {
+ uint32_t offset; /* from mach_header to start of data range*/
+ uint16_t length; /* number of bytes in data range */
+ uint16_t kind; /* a DICE_KIND_* value */
+};
+#define DICE_KIND_DATA 0x0001
+#define DICE_KIND_JUMP_TABLE8 0x0002
+#define DICE_KIND_JUMP_TABLE16 0x0003
+#define DICE_KIND_JUMP_TABLE32 0x0004
+#define DICE_KIND_ABS_JUMP_TABLE32 0x0005
+
+
+
+/*
+ * Sections of type S_THREAD_LOCAL_VARIABLES contain an array
+ * of tlv_descriptor structures.
+ */
+struct tlv_descriptor
+{
+ void* (*thunk)(struct tlv_descriptor*);
+ unsigned long key;
+ unsigned long offset;
};
#endif /* _MACHO_LOADER_H_ */
projects / apple / xnu.git / blobdiff