/* Mach-O support for BFD. Copyright 1999, 2000, 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2011, 2012 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef _BFD_MACH_O_H_ #define _BFD_MACH_O_H_ #include "bfd.h" #include "mach-o/loader.h" typedef struct bfd_mach_o_header { unsigned long magic; unsigned long cputype; unsigned long cpusubtype; unsigned long filetype; unsigned long ncmds; unsigned long sizeofcmds; unsigned long flags; unsigned int reserved; /* Version 1: 32 bits, version 2: 64 bits. */ unsigned int version; enum bfd_endian byteorder; } bfd_mach_o_header; #define BFD_MACH_O_SEGNAME_SIZE 16 #define BFD_MACH_O_SECTNAME_SIZE 16 typedef struct bfd_mach_o_section { /* Fields present in the file. */ char sectname[BFD_MACH_O_SECTNAME_SIZE + 1]; /* Always NUL padded. */ char segname[BFD_MACH_O_SEGNAME_SIZE + 1]; bfd_vma addr; bfd_vma size; bfd_vma offset; unsigned long align; bfd_vma reloff; unsigned long nreloc; unsigned long flags; unsigned long reserved1; unsigned long reserved2; unsigned long reserved3; /* Corresponding bfd section. */ asection *bfdsection; /* Simply linked list. */ struct bfd_mach_o_section *next; } bfd_mach_o_section; typedef struct bfd_mach_o_segment_command { char segname[BFD_MACH_O_SEGNAME_SIZE + 1]; bfd_vma vmaddr; bfd_vma vmsize; bfd_vma fileoff; unsigned long filesize; unsigned long maxprot; /* Maximum permitted protection. */ unsigned long initprot; /* Initial protection. */ unsigned long nsects; unsigned long flags; /* Linked list of sections. */ bfd_mach_o_section *sect_head; bfd_mach_o_section *sect_tail; } bfd_mach_o_segment_command; /* Protection flags. */ #define BFD_MACH_O_PROT_READ 0x01 #define BFD_MACH_O_PROT_WRITE 0x02 #define BFD_MACH_O_PROT_EXECUTE 0x04 /* Expanded internal representation of a relocation entry. */ typedef struct bfd_mach_o_reloc_info { bfd_vma r_address; bfd_vma r_value; unsigned int r_scattered : 1; unsigned int r_type : 4; unsigned int r_pcrel : 1; unsigned int r_length : 2; unsigned int r_extern : 1; } bfd_mach_o_reloc_info; typedef struct bfd_mach_o_asymbol { /* The actual symbol which the rest of BFD works with. */ asymbol symbol; /* Mach-O symbol fields. */ unsigned char n_type; unsigned char n_sect; unsigned short n_desc; } bfd_mach_o_asymbol; /* The symbol table is sorted like this: (1) local. (otherwise in order of generation) (2) external defined (sorted by name) (3) external undefined (sorted by name) (4) common (sorted by name) */ typedef struct bfd_mach_o_symtab_command { unsigned int symoff; unsigned int nsyms; unsigned int stroff; unsigned int strsize; bfd_mach_o_asymbol *symbols; char *strtab; } bfd_mach_o_symtab_command; /* 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) 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. */ typedef struct bfd_mach_o_dylib_module { /* Index into the string table indicating the name of the module. */ unsigned long module_name_idx; char *module_name; /* Index into the symbol table of the first defined external symbol provided by the module. */ unsigned long iextdefsym; /* Number of external symbols provided by this module. */ unsigned long nextdefsym; /* Index into the external reference table of the first entry provided by this module. */ unsigned long irefsym; /* Number of external reference entries provided by this module. */ unsigned long nrefsym; /* Index into the symbol table of the first local symbol provided by this module. */ unsigned long ilocalsym; /* Number of local symbols provided by this module. */ unsigned long nlocalsym; /* Index into the external relocation table of the first entry provided by this module. */ unsigned long iextrel; /* Number of external relocation entries provided by this module. */ unsigned long nextrel; /* Index in the module initialization section to the pointers for this module. */ unsigned short iinit; /* Index in the module termination section to the pointers for this module. */ unsigned short iterm; /* Number of pointers in the module initialization for this module. */ unsigned short ninit; /* Number of pointers in the module termination for this module. */ unsigned short nterm; /* Number of data byte for this module that are used in the __module_info section of the __OBJC segment. */ unsigned long objc_module_info_size; /* Statically linked address of the start of the data for this module in the __module_info section of the __OBJC_segment. */ bfd_vma objc_module_info_addr; } bfd_mach_o_dylib_module; typedef struct bfd_mach_o_dylib_table_of_content { /* Index into the symbol table to the defined external symbol. */ unsigned long symbol_index; /* Index into the module table to the module for this entry. */ unsigned long module_index; } bfd_mach_o_dylib_table_of_content; typedef struct bfd_mach_o_dylib_reference { /* Index into the symbol table for the symbol being referenced. */ unsigned long isym; /* Type of the reference being made (use REFERENCE_FLAGS constants). */ unsigned long flags; } bfd_mach_o_dylib_reference; #define BFD_MACH_O_REFERENCE_SIZE 4 typedef struct bfd_mach_o_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). */ unsigned long ilocalsym; /* Index to local symbols. */ unsigned long nlocalsym; /* Number of local symbols. */ unsigned long iextdefsym; /* Index to externally defined symbols. */ unsigned long nextdefsym; /* Number of externally defined symbols. */ unsigned long iundefsym; /* Index to undefined symbols. */ unsigned long 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. */ unsigned long tocoff; /* File offset to table of contents. */ unsigned long 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. */ unsigned long modtaboff; /* File offset to module table. */ unsigned long 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. */ unsigned long extrefsymoff; /* Offset to referenced symbol table. */ unsigned long 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. */ unsigned long indirectsymoff; /* File offset to the indirect symbol table. */ unsigned long 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. 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). */ unsigned long extreloff; /* Offset to external relocation entries. */ unsigned long 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 statically link edited address). */ unsigned long locreloff; /* Offset to local relocation entries. */ unsigned long nlocrel; /* Number of local relocation entries. */ bfd_mach_o_dylib_module *dylib_module; bfd_mach_o_dylib_table_of_content *dylib_toc; unsigned int *indirect_syms; bfd_mach_o_dylib_reference *ext_refs; } bfd_mach_o_dysymtab_command; /* 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) has 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 BFD_MACH_O_INDIRECT_SYMBOL_LOCAL 0x80000000 #define BFD_MACH_O_INDIRECT_SYMBOL_ABS 0x40000000 #define BFD_MACH_O_INDIRECT_SYMBOL_SIZE 4 /* For LC_THREAD or LC_UNIXTHREAD. */ typedef struct bfd_mach_o_thread_flavour { unsigned long flavour; unsigned long offset; unsigned long size; } bfd_mach_o_thread_flavour; typedef struct bfd_mach_o_thread_command { unsigned long nflavours; bfd_mach_o_thread_flavour *flavours; asection *section; } bfd_mach_o_thread_command; /* For LC_LOAD_DYLINKER and LC_ID_DYLINKER. */ typedef struct bfd_mach_o_dylinker_command { unsigned long name_offset; /* Offset to library's path name. */ unsigned long name_len; /* Offset to library's path name. */ char *name_str; } bfd_mach_o_dylinker_command; /* For LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, LC_ID_DYLIB or LC_REEXPORT_DYLIB. */ typedef struct bfd_mach_o_dylib_command { unsigned long name_offset; /* Offset to library's path name. */ unsigned long name_len; /* Offset to 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. */ char *name_str; } bfd_mach_o_dylib_command; /* For LC_PREBOUND_DYLIB. */ typedef struct bfd_mach_o_prebound_dylib_command { unsigned long name; /* Library's path name. */ unsigned long nmodules; /* Number of modules in library. */ unsigned long linked_modules; /* Bit vector of linked modules. */ } bfd_mach_o_prebound_dylib_command; /* For LC_UUID. */ typedef struct bfd_mach_o_uuid_command { unsigned char uuid[16]; } bfd_mach_o_uuid_command; /* For LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO. */ typedef struct bfd_mach_o_linkedit_command { unsigned long dataoff; unsigned long datasize; } bfd_mach_o_linkedit_command; typedef struct bfd_mach_o_str_command { unsigned long stroff; unsigned long str_len; char *str; } bfd_mach_o_str_command; typedef struct bfd_mach_o_dyld_info_command { /* File offset and size to rebase info. */ unsigned int rebase_off; unsigned int rebase_size; /* File offset and size of binding info. */ unsigned int bind_off; unsigned int bind_size; /* File offset and size of weak binding info. */ unsigned int weak_bind_off; unsigned int weak_bind_size; /* File offset and size of lazy binding info. */ unsigned int lazy_bind_off; unsigned int lazy_bind_size; /* File offset and size of export info. */ unsigned int export_off; unsigned int export_size; } bfd_mach_o_dyld_info_command; typedef struct bfd_mach_o_version_min_command { unsigned char rel; unsigned char maj; unsigned char min; unsigned int reserved; } bfd_mach_o_version_min_command; typedef struct bfd_mach_o_load_command { bfd_mach_o_load_command_type type; bfd_boolean type_required; unsigned int offset; unsigned int len; union { bfd_mach_o_segment_command segment; bfd_mach_o_symtab_command symtab; bfd_mach_o_dysymtab_command dysymtab; bfd_mach_o_thread_command thread; bfd_mach_o_dylib_command dylib; bfd_mach_o_dylinker_command dylinker; bfd_mach_o_prebound_dylib_command prebound_dylib; bfd_mach_o_uuid_command uuid; bfd_mach_o_linkedit_command linkedit; bfd_mach_o_str_command str; bfd_mach_o_dyld_info_command dyld_info; bfd_mach_o_version_min_command version_min; } command; } bfd_mach_o_load_command; typedef struct mach_o_data_struct { /* Mach-O header. */ bfd_mach_o_header header; /* Array of load commands (length is given by header.ncmds). */ bfd_mach_o_load_command *commands; /* Flatten array of sections. The array is 0-based. */ unsigned long nsects; bfd_mach_o_section **sections; /* Used while writing: current length of the output file. This is used to allocate space in the file. */ ufile_ptr filelen; /* As symtab is referenced by other load command, it is handy to have a direct access to it. Although it is not clearly stated, only one symtab is expected. */ bfd_mach_o_symtab_command *symtab; bfd_mach_o_dysymtab_command *dysymtab; /* Base values used for building the dysymtab for a single-module object. */ unsigned long nlocal; unsigned long ndefext; unsigned long nundefext; /* If this is non-zero, then the pointer below is populated. */ unsigned long nindirect; /* A set of synthetic symbols representing the 'indirect' ones in the file. These should be sorted (a) by the section they represent and (b) by the order that they appear within each section. */ asymbol **indirect_syms; /* A place to stash dwarf2 info for this bfd. */ void *dwarf2_find_line_info; /* BFD of .dSYM file. */ bfd *dsym_bfd; /* Cache of dynamic relocs. */ arelent *dyn_reloc_cache; } bfd_mach_o_data_struct; typedef struct bfd_mach_o_xlat_name { const char *name; unsigned long val; } bfd_mach_o_xlat_name; /* Target specific routines. */ #define bfd_mach_o_get_data(abfd) ((abfd)->tdata.mach_o_data) #define bfd_mach_o_get_backend_data(abfd) \ ((bfd_mach_o_backend_data*)(abfd)->xvec->backend_data) /* Get the Mach-O header for section SEC. */ #define bfd_mach_o_get_mach_o_section(sec) \ ((bfd_mach_o_section *)(sec)->used_by_bfd) bfd_boolean bfd_mach_o_valid (bfd *); bfd_boolean bfd_mach_o_mkobject_init (bfd *); const bfd_target *bfd_mach_o_object_p (bfd *); const bfd_target *bfd_mach_o_core_p (bfd *); const bfd_target *bfd_mach_o_archive_p (bfd *); bfd *bfd_mach_o_openr_next_archived_file (bfd *, bfd *); bfd_boolean bfd_mach_o_set_arch_mach (bfd *, enum bfd_architecture, unsigned long); int bfd_mach_o_lookup_command (bfd *, bfd_mach_o_load_command_type, bfd_mach_o_load_command **); bfd_boolean bfd_mach_o_new_section_hook (bfd *, asection *); bfd_boolean bfd_mach_o_write_contents (bfd *); bfd_boolean bfd_mach_o_bfd_copy_private_symbol_data (bfd *, asymbol *, bfd *, asymbol *); bfd_boolean bfd_mach_o_bfd_copy_private_section_data (bfd *, asection *, bfd *, asection *); bfd_boolean bfd_mach_o_bfd_copy_private_bfd_data (bfd *, bfd *); bfd_boolean bfd_mach_o_bfd_set_private_flags (bfd *, flagword); long bfd_mach_o_get_symtab_upper_bound (bfd *); long bfd_mach_o_canonicalize_symtab (bfd *, asymbol **); long bfd_mach_o_get_synthetic_symtab (bfd *, long, asymbol **, long, asymbol **, asymbol **ret); long bfd_mach_o_get_reloc_upper_bound (bfd *, asection *); long bfd_mach_o_canonicalize_reloc (bfd *, asection *, arelent **, asymbol **); long bfd_mach_o_get_dynamic_reloc_upper_bound (bfd *); long bfd_mach_o_canonicalize_dynamic_reloc (bfd *, arelent **, asymbol **); asymbol *bfd_mach_o_make_empty_symbol (bfd *); void bfd_mach_o_get_symbol_info (bfd *, asymbol *, symbol_info *); void bfd_mach_o_print_symbol (bfd *, PTR, asymbol *, bfd_print_symbol_type); int bfd_mach_o_sizeof_headers (bfd *, struct bfd_link_info *); unsigned long bfd_mach_o_stack_addr (enum bfd_mach_o_cpu_type); int bfd_mach_o_core_fetch_environment (bfd *, unsigned char **, unsigned int *); char *bfd_mach_o_core_file_failing_command (bfd *); int bfd_mach_o_core_file_failing_signal (bfd *); bfd_boolean bfd_mach_o_core_file_matches_executable_p (bfd *, bfd *); bfd *bfd_mach_o_fat_extract (bfd *, bfd_format , const bfd_arch_info_type *); const bfd_target *bfd_mach_o_header_p (bfd *, bfd_mach_o_filetype, bfd_mach_o_cpu_type); bfd_boolean bfd_mach_o_build_commands (bfd *); bfd_boolean bfd_mach_o_set_section_contents (bfd *, asection *, const void *, file_ptr, bfd_size_type); unsigned int bfd_mach_o_version (bfd *); unsigned int bfd_mach_o_get_section_type_from_name (bfd *, const char *); unsigned int bfd_mach_o_get_section_attribute_from_name (const char *); void bfd_mach_o_convert_section_name_to_bfd (bfd *, const char *, const char *, const char **, flagword *); bfd_boolean bfd_mach_o_find_nearest_line (bfd *, asection *, asymbol **, bfd_vma, const char **, const char **, unsigned int *); bfd_boolean bfd_mach_o_close_and_cleanup (bfd *); bfd_boolean bfd_mach_o_free_cached_info (bfd *); unsigned int bfd_mach_o_section_get_nbr_indirect (bfd *, bfd_mach_o_section *); unsigned int bfd_mach_o_section_get_entry_size (bfd *, bfd_mach_o_section *); bfd_boolean bfd_mach_o_read_symtab_symbols (bfd *); bfd_boolean bfd_mach_o_read_symtab_strtab (bfd *abfd); /* A placeholder in case we need to suppress emitting the dysymtab for some reason (e.g. compatibility with older system versions). */ #define bfd_mach_o_should_emit_dysymtab(x) TRUE extern const bfd_mach_o_xlat_name bfd_mach_o_section_attribute_name[]; extern const bfd_mach_o_xlat_name bfd_mach_o_section_type_name[]; extern const bfd_target mach_o_fat_vec; /* Interfaces between BFD names and Mach-O names. */ typedef struct mach_o_section_name_xlat { const char *bfd_name; const char *mach_o_name; flagword bfd_flags; unsigned int macho_sectype; unsigned int macho_secattr; unsigned int sectalign; } mach_o_section_name_xlat; typedef struct mach_o_segment_name_xlat { const char *segname; const mach_o_section_name_xlat *sections; } mach_o_segment_name_xlat; const mach_o_section_name_xlat * bfd_mach_o_section_data_for_mach_sect (bfd *, const char *, const char *); const mach_o_section_name_xlat * bfd_mach_o_section_data_for_bfd_name (bfd *, const char *, const char **); typedef struct bfd_mach_o_backend_data { enum bfd_architecture arch; bfd_boolean (*_bfd_mach_o_swap_reloc_in)(arelent *, bfd_mach_o_reloc_info *); bfd_boolean (*_bfd_mach_o_swap_reloc_out)(arelent *, bfd_mach_o_reloc_info *); bfd_boolean (*_bfd_mach_o_print_thread)(bfd *, bfd_mach_o_thread_flavour *, void *, char *); const mach_o_segment_name_xlat *segsec_names_xlat; bfd_boolean (*bfd_mach_o_section_type_valid_for_target) (unsigned long); } bfd_mach_o_backend_data; /* Symbol type tests. */ #define IS_MACHO_INDIRECT(x) (((x) & BFD_MACH_O_N_TYPE) == BFD_MACH_O_N_INDR) #endif /* _BFD_MACH_O_H_ */