diff options
Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/third_party/mac_headers/mach-o/loader.h')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/third_party/mac_headers/mach-o/loader.h | 1402 |
1 files changed, 0 insertions, 1402 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/third_party/mac_headers/mach-o/loader.h b/toolkit/crashreporter/google-breakpad/src/third_party/mac_headers/mach-o/loader.h deleted file mode 100644 index ff18e29c7..000000000 --- a/toolkit/crashreporter/google-breakpad/src/third_party/mac_headers/mach-o/loader.h +++ /dev/null @@ -1,1402 +0,0 @@ -/* - * Copyright (c) 1999-2010 Apple Inc. All Rights Reserved. - * - * @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. 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 - * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, - * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. - * Please see the License for the specific language governing rights and - * limitations under the License. - * - * @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 - * and contains the constants for the possible values of these types. - */ -#include <mach/machine.h> - -/* - * <mach/vm_prot.h> is needed here for the vm_prot_t type and contains the - * constants that are or'ed together for the possible values of this type. - */ -#include <mach/vm_prot.h> - -/* - * <machine/thread_status.h> is expected to define the flavors of the thread - * states and the structures of those flavors for each machine. - */ -#include <mach/machine/thread_status.h> -#include <architecture/byte_order.h> - -/* - * 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) */ - -/* - * The layout of the file depends on the filetype. For all but the MH_OBJECT - * file type the segments are padded out and aligned on a segment alignment - * boundary for efficient demand pageing. The MH_EXECUTE, MH_FVMLIB, MH_DYLIB, - * MH_DYLINKER and MH_BUNDLE file types also have the headers included as part - * of their first segment. - * - * The file type MH_OBJECT is a compact format intended as output of the - * 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 its size. - * - * The file type MH_PRELOAD is an executable format intended for things that - * 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. - * - * A core file is in MH_CORE format and can be any in an arbritray legal - * Mach-O file. - * - * Constants for the filetype field of the mach_header - */ -#define MH_OBJECT 0x1 /* relocatable object file */ -#define MH_EXECUTE 0x2 /* demand paged executable file */ -#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 /* dynamically bound shared library */ -#define MH_DYLINKER 0x7 /* dynamic link editor */ -#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 */ -#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_DYLDLINK 0x4 /* the object file is input for the - dynamic linker and can't be staticly - 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 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 - * of the commands is given by the sizeofcmds field in the mach_header. All - * load commands must have as their first two fields cmd and cmdsize. The cmd - * field is filled in with a constant for that command type. Each command type - * has a structure specifically for it. The cmdsize field is the size in bytes - * of the particular load command structure plus anything that follows it that - * is a part of the load command (i.e. section structures, strings, etc.). To - * advance to the next load command the cmdsize can be added to the offset or - * 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). - * 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 { - 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_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 */ - -/* - * A variable length string in a load command is represented by an lc_str - * union. The strings are stored just after the load command structure and - * 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 4 bytes must be zero. - */ -union lc_str { - uint32_t offset; /* offset to the string */ -#ifndef __LP64__ - char *ptr; /* pointer to the string */ -#endif -}; - -/* - * The segment load command indicates that a part of this file is to be - * mapped into the task's address space. The size of this segment in memory, - * vmsize, maybe equal to or larger than the amount to map from this file, - * filesize. The file is mapped starting at fileoff to the beginning of - * the segment in memory, vmaddr. The rest of the memory of the segment, - * if any, is allocated zero fill on demand. The segment's maximum virtual - * memory protection and initial virtual memory protection are specified - * by the maxprot and initprot fields. If the segment has sections then the - * section structures directly follow the segment command and their size is - * reflected in cmdsize. - */ -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 */ -}; - -/* 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 - 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 - 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 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 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. - * - * Sections with the same section name, sectname, going into the same segment, - * segname, are combined by the link editor. The resulting section is aligned - * to the maximum alignment of the combined sections and is the new section's - * alignment. The combined sections are aligned to their original alignment in - * the combined section. Any padded bytes to get the specified alignment are - * zeroed. - * - * The format of the relocation entries referenced by the reloff and nreloc - * fields of the section structure for mach object files is described in the - * header file <reloc.h>. - */ -struct section { /* for 32-bit architectures */ - char sectname[16]; /* name of this section */ - char segname[16]; /* segment this section goes in */ - 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 */ - 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 */ -}; - -/* - * 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 - * can only have one type) but the section attributes are not (it may have more - * than one attribute). - */ -#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 */ -/* - * 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 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) */ - /* 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. (THIS IS OBSOLETE and no longer supported). - */ -struct fvmlib { - union lc_str name; /* library's target pathname */ - uint32_t minor_version; /* library's minor version number */ - uint32_t header_addr; /* library's header address */ -}; - -/* - * A fixed virtual shared library (filetype == MH_FVMLIB in the mach header) - * 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 { - uint32_t cmd; /* LC_IDFVMLIB or LC_LOADFVMLIB */ - uint32_t cmdsize; /* includes pathname string */ - struct fvmlib fvmlib; /* the library identification */ -}; - -/* - * Dynamicly linked shared libraries are identified by two things. The - * pathname (the name of the library as found for execution), and the - * compatibility version number. The pathname must match and the compatibility - * number in the user of the library must be greater than or equal to the - * library being used. The time stamp is used to record the time a library was - * built and copied into user so it can be use to determined if the library used - * at runtime is exactly the same as used to built the program. - */ -struct dylib { - union lc_str name; /* library's path name */ - 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 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 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 { - 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 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 - * of the first byte. So the bit for the Nth module is: - * (linked_modules[N/8] >> N%8) & 1 - */ -struct prebound_dylib_command { - uint32_t cmd; /* LC_PREBOUND_DYLIB */ - uint32_t cmdsize; /* includes strings */ - union lc_str name; /* library's path name */ - uint32_t nmodules; /* number of modules in library */ - union lc_str linked_modules; /* bit vector of linked modules */ -}; - -/* - * A program that uses a dynamic linker contains a dylinker_command to identify - * 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 { - 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 */ -}; - -/* - * Thread commands contain machine-specific data structures suitable for - * 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 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 - * 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. - * - * For executable objects that are unix processes there will be one - * thread_command (cmd == LC_UNIXTHREAD) created for it by the link-editor. - * This is the same as a LC_THREAD, except that a stack is automatically - * created (based on the shell's limit for the stack size). Command arguments - * and environment variables are copied onto that stack. - */ -struct thread_command { - 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 { - 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 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 - * present. When this load command is present the symbol table is organized - * 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 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. - * - * This load command contains a the offsets and sizes of the following new - * symbolic information tables: - * table of contents - * module table - * 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 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: - * table of contents - the defined external symbols are sorted by name - * module table - the file contains only one module so everything in the - * file is part of the module. - * reference symbol table - is the defined and undefined external symbols - * - * 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 - * local relocation entries - * For executable and object modules the relocation entries continue to hang - * off the section structures. - */ -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 - * are grouped into the following three groups: - * local symbols (further grouped by the module they are from) - * defined external symbols (further grouped by the module they are from) - * undefined symbols - * - * The local symbols are used only for debugging. The dynamic binding - * process may have to use them to indicate to the debugger the local - * symbols for a module that is being bound. - * - * 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 dynamically linked shared library file). - */ - 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 */ - - /* - * 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 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. - */ - 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 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. - */ - 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 dynamically linked shared library file. For - * executable and object modules the defined external symbols and the - * undefined external symbols indicates the external references. - */ - 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 - * indexes and (implied counts based on the size of the section and fixed - * size of the entry) into the "indirect symbol" table for each pointer - * and stub. For every section of these two types the index into the - * indirect symbol table is stored in the section header in the field - * reserved1. An indirect symbol table entry is simply a 32bit index into - * 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. - */ - 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 - * external relocation entries for each module in the library need to be - * accessed efficiently. Since the relocation entries can't be accessed - * through the section headers for a library file they are separated into - * groups of local and external entries further grouped by module. In this - * case the presents of this load command who's extreloff, nextrel, - * locreloff and nlocrel fields are non-zero indicates that the relocation - * entries of non-merged sections are not referenced through the section - * structures (and the reloff and nreloc fields in the section headers are - * set to zero). - * - * Since the relocation entries are not accessed through the section headers - * 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 - * relocation entries for that the module. - * - * For sections that are merged across modules there must not be any - * remaining external relocation entries for them (for merged sections - * remaining relocation entries must be local). - */ - 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). - */ - uint32_t locreloff; /* offset to local relocation entries */ - uint32_t nlocrel; /* number of local relocation entries */ - -}; - -/* - * An indirect symbol table entry is simply a 32bit index into the symbol table - * to the symbol that the pointer or stub is refering to. Unless it is for a - * non-lazy symbol pointer section for a defined symbol which strip(1) as - * removed. In which case it has the value INDIRECT_SYMBOL_LOCAL. If the - * symbol was also absolute INDIRECT_SYMBOL_ABS is or'ed with that. - */ -#define INDIRECT_SYMBOL_LOCAL 0x80000000 -#define INDIRECT_SYMBOL_ABS 0x40000000 - - -/* a table of contents entry */ -struct dylib_table_of_contents { - uint32_t symbol_index; /* the defined external symbol - (index into the symbol table) */ - uint32_t module_index; /* index into the module table this symbol - is defined in */ -}; - -/* a module table entry */ -struct dylib_module { - 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 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 - 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 address of the start of */ - objc_module_info_addr; /* the (__OBJC,__module_info) section */ - 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 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 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 */ - 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 - * or replaced. Therefore all external symbols (defined and undefined) are - * listed in the module's reference table. The flags describe the type of - * reference that is being made. The constants for the flags are defined in - * <mach-o/nlist.h> as they are also used for symbol table entries. - */ -struct dylib_reference { - 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, - or LC_FUNCTION_STARTS */ - 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 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 reserved; /* zero */ -}; - -/* - * 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. - * - * 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 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 { - 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 4 bytes/ - * (THIS IS OBSOLETE and no longer supported). - */ -struct ident_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 - * internal use. The kernel ignores this command when loading a program into - * memory). - */ -struct fvmfile_command { - uint32_t cmd; /* LC_FVMFILE */ - uint32_t cmdsize; /* includes pathname string */ - union lc_str name; /* files pathname */ - uint32_t header_addr; /* files virtual address */ -}; - -/* - * 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_ */ |