bfd/mach-o.h

   1 /* Mach-O support for BFD.
   2    Copyright 1999, 2000, 2001, 2002, 2003, 2005, 2007
   3    Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #ifndef _BFD_MACH_O_H_
  23 #define _BFD_MACH_O_H_
  24
  25 #include "bfd.h"
  26
  27 #define BFD_MACH_O_N_STAB  0xe0 /* If any of these bits set, a symbolic debugging entry.  */
  28 #define BFD_MACH_O_N_PEXT  0x10 /* Private external symbol bit.  */
  29 #define BFD_MACH_O_N_TYPE  0x0e /* Mask for the type bits.  */
  30 #define BFD_MACH_O_N_EXT   0x01 /* External symbol bit, set for external symbols.  */
  31 #define BFD_MACH_O_N_UNDF  0x00 /* Undefined, n_sect == NO_SECT.  */
  32 #define BFD_MACH_O_N_ABS   0x02 /* Absolute, n_sect == NO_SECT.  */
  33 #define BFD_MACH_O_N_SECT  0x0e /* Defined in section number n_sect.  */
  34 #define BFD_MACH_O_N_PBUD  0x0c /* Prebound undefined (defined in a dylib).  */
  35 #define BFD_MACH_O_N_INDR  0x0a /* Indirect.  */
  36
  37 typedef enum bfd_mach_o_ppc_thread_flavour
  38 {
  39   BFD_MACH_O_PPC_THREAD_STATE = 1,
  40   BFD_MACH_O_PPC_FLOAT_STATE = 2,
  41   BFD_MACH_O_PPC_EXCEPTION_STATE = 3,
  42   BFD_MACH_O_PPC_VECTOR_STATE = 4
  43 }
  44 bfd_mach_o_ppc_thread_flavour;
  45
  46 typedef enum bfd_mach_o_i386_thread_flavour
  47 {
  48   BFD_MACH_O_i386_NEW_THREAD_STATE = 1,
  49   BFD_MACH_O_i386_FLOAT_STATE = 2,
  50   BFD_MACH_O_i386_ISA_PORT_MAP_STATE = 3,
  51   BFD_MACH_O_i386_V86_ASSIST_STATE = 4,
  52   BFD_MACH_O_i386_REGS_SEGS_STATE = 5,
  53   BFD_MACH_O_i386_THREAD_SYSCALL_STATE = 6,
  54   BFD_MACH_O_i386_THREAD_STATE_NONE = 7,
  55   BFD_MACH_O_i386_SAVED_STATE = 8,
  56   BFD_MACH_O_i386_THREAD_STATE = -1,
  57   BFD_MACH_O_i386_THREAD_FPSTATE = -2,
  58   BFD_MACH_O_i386_THREAD_EXCEPTSTATE = -3,
  59   BFD_MACH_O_i386_THREAD_CTHREADSTATE = -4,
  60 }
  61 bfd_mach_o_i386_thread_flavour;
  62
  63 #define BFD_MACH_O_LC_REQ_DYLD 0x80000000
  64
  65 typedef enum bfd_mach_o_load_command_type
  66 {
  67   BFD_MACH_O_LC_SEGMENT = 0x1,          /* File segment to be mapped.  */
  68   BFD_MACH_O_LC_SYMTAB = 0x2,           /* Link-edit stab symbol table info (obsolete).  */
  69   BFD_MACH_O_LC_SYMSEG = 0x3,           /* Link-edit gdb symbol table info.  */
  70   BFD_MACH_O_LC_THREAD = 0x4,           /* Thread.  */
  71   BFD_MACH_O_LC_UNIXTHREAD = 0x5,       /* UNIX thread (includes a stack).  */
  72   BFD_MACH_O_LC_LOADFVMLIB = 0x6,       /* Load a fixed VM shared library.  */
  73   BFD_MACH_O_LC_IDFVMLIB = 0x7,         /* Fixed VM shared library id.  */
  74   BFD_MACH_O_LC_IDENT = 0x8,            /* Object identification information (obsolete).  */
  75   BFD_MACH_O_LC_FVMFILE = 0x9,          /* Fixed VM file inclusion.  */
  76   BFD_MACH_O_LC_PREPAGE = 0xa,          /* Prepage command (internal use).  */
  77   BFD_MACH_O_LC_DYSYMTAB = 0xb,         /* Dynamic link-edit symbol table info.  */
  78   BFD_MACH_O_LC_LOAD_DYLIB = 0xc,       /* Load a dynamically linked shared library.  */
  79   BFD_MACH_O_LC_ID_DYLIB = 0xd,         /* Dynamically linked shared lib identification.  */
  80   BFD_MACH_O_LC_LOAD_DYLINKER = 0xe,    /* Load a dynamic linker.  */
  81   BFD_MACH_O_LC_ID_DYLINKER = 0xf,      /* Dynamic linker identification.  */
  82   BFD_MACH_O_LC_PREBOUND_DYLIB = 0x10,  /* Modules prebound for a dynamically.  */
  83   BFD_MACH_O_LC_ROUTINES = 0x11,        /* Image routines.  */
  84   BFD_MACH_O_LC_SUB_FRAMEWORK = 0x12,   /* Sub framework.  */
  85   BFD_MACH_O_LC_SUB_UMBRELLA = 0x13,    /* Sub umbrella.  */
  86   BFD_MACH_O_LC_SUB_CLIENT = 0x14,      /* Sub client.  */
  87   BFD_MACH_O_LC_SUB_LIBRARY = 0x15,     /* Sub library.  */
  88   BFD_MACH_O_LC_TWOLEVEL_HINTS = 0x16,  /* Two-level namespace lookup hints.  */
  89   BFD_MACH_O_LC_PREBIND_CKSUM = 0x17,   /* Prebind checksum.  */
  90   /* Load a dynamically linked shared library that is allowed to be
  91        missing (weak).  */
  92   BFD_MACH_O_LC_LOAD_WEAK_DYLIB = 0x18
  93 }
  94 bfd_mach_o_load_command_type;
  95
  96 typedef enum bfd_mach_o_cpu_type
  97 {
  98   BFD_MACH_O_CPU_TYPE_VAX = 1,
  99   BFD_MACH_O_CPU_TYPE_MC680x0 = 6,
 100   BFD_MACH_O_CPU_TYPE_I386 = 7,
 101   BFD_MACH_O_CPU_TYPE_MIPS = 8,
 102   BFD_MACH_O_CPU_TYPE_MC98000 = 10,
 103   BFD_MACH_O_CPU_TYPE_HPPA = 11,
 104   BFD_MACH_O_CPU_TYPE_ARM = 12,
 105   BFD_MACH_O_CPU_TYPE_MC88000 = 13,
 106   BFD_MACH_O_CPU_TYPE_SPARC = 14,
 107   BFD_MACH_O_CPU_TYPE_I860 = 15,
 108   BFD_MACH_O_CPU_TYPE_ALPHA = 16,
 109   BFD_MACH_O_CPU_TYPE_POWERPC = 18
 110 }
 111 bfd_mach_o_cpu_type;
 112
 113 typedef enum bfd_mach_o_filetype
 114 {
 115   BFD_MACH_O_MH_OBJECT = 1,
 116   BFD_MACH_O_MH_EXECUTE = 2,
 117   BFD_MACH_O_MH_FVMLIB = 3,
 118   BFD_MACH_O_MH_CORE = 4,
 119   BFD_MACH_O_MH_PRELOAD = 5,
 120   BFD_MACH_O_MH_DYLIB = 6,
 121   BFD_MACH_O_MH_DYLINKER = 7,
 122   BFD_MACH_O_MH_BUNDLE = 8
 123 }
 124 bfd_mach_o_filetype;
 125
 126 /* Constants for the type of a section.  */
 127
 128 typedef enum bfd_mach_o_section_type
 129 {
 130   /* Regular section.  */
 131   BFD_MACH_O_S_REGULAR = 0x0,
 132
 133   /* Zero fill on demand section.  */
 134   BFD_MACH_O_S_ZEROFILL = 0x1,
 135
 136   /* Section with only literal C strings.  */
 137   BFD_MACH_O_S_CSTRING_LITERALS = 0x2,
 138
 139   /* Section with only 4 byte literals.  */
 140   BFD_MACH_O_S_4BYTE_LITERALS = 0x3,
 141
 142   /* Section with only 8 byte literals.  */
 143   BFD_MACH_O_S_8BYTE_LITERALS = 0x4,
 144
 145   /* Section with only pointers to literals.  */
 146   BFD_MACH_O_S_LITERAL_POINTERS = 0x5,
 147
 148   /* For the two types of symbol pointers sections and the symbol stubs
 149      section they have indirect symbol table entries.  For each of the
 150      entries in the section the indirect symbol table entries, in
 151      corresponding order in the indirect symbol table, start at the index
 152      stored in the reserved1 field of the section structure.  Since the
 153      indirect symbol table entries correspond to the entries in the
 154      section the number of indirect symbol table entries is inferred from
 155      the size of the section divided by the size of the entries in the
 156      section.  For symbol pointers sections the size of the entries in
 157      the section is 4 bytes and for symbol stubs sections the byte size
 158      of the stubs is stored in the reserved2 field of the section
 159      structure.  */
 160
 161   /* Section with only non-lazy symbol pointers.  */
 162   BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS = 0x6,
 163
 164   /* Section with only lazy symbol pointers.  */
 165   BFD_MACH_O_S_LAZY_SYMBOL_POINTERS = 0x7,
 166
 167   /* Section with only symbol stubs, byte size of stub in the reserved2 field.  */
 168   BFD_MACH_O_S_SYMBOL_STUBS = 0x8,
 169
 170   /* Section with only function pointers for initialization.  */
 171   BFD_MACH_O_S_MOD_INIT_FUNC_POINTERS = 0x9
 172 }
 173 bfd_mach_o_section_type;
 174
 175 typedef unsigned long bfd_mach_o_cpu_subtype;
 176
 177 typedef struct bfd_mach_o_header
 178 {
 179   unsigned long magic;
 180   unsigned long cputype;
 181   unsigned long cpusubtype;
 182   unsigned long filetype;
 183   unsigned long ncmds;
 184   unsigned long sizeofcmds;
 185   unsigned long flags;
 186   enum bfd_endian byteorder;
 187 }
 188 bfd_mach_o_header;
 189
 190 typedef struct bfd_mach_o_section
 191 {
 192   asection *bfdsection;
 193   char sectname[16 + 1];
 194   char segname[16 + 1];
 195   bfd_vma addr;
 196   bfd_vma size;
 197   bfd_vma offset;
 198   unsigned long align;
 199   bfd_vma reloff;
 200   unsigned long nreloc;
 201   unsigned long flags;
 202   unsigned long reserved1;
 203   unsigned long reserved2;
 204 }
 205 bfd_mach_o_section;
 206
 207 typedef struct bfd_mach_o_segment_command
 208 {
 209   char segname[16];
 210   bfd_vma vmaddr;
 211   bfd_vma vmsize;
 212   bfd_vma fileoff;
 213   unsigned long filesize;
 214   unsigned long nsects;
 215   unsigned long flags;
 216   bfd_mach_o_section *sections;
 217   asection *segment;
 218 }
 219 bfd_mach_o_segment_command;
 220
 221 typedef struct bfd_mach_o_symtab_command
 222 {
 223   unsigned long symoff;
 224   unsigned long nsyms;
 225   unsigned long stroff;
 226   unsigned long strsize;
 227   asymbol *symbols;
 228   char *strtab;
 229   asection *stabs_segment;
 230   asection *stabstr_segment;
 231 }
 232 bfd_mach_o_symtab_command;
 233
 234 /* This is the second set of the symbolic information which is used to support
 235    the data structures for the dynamically link editor.
 236
 237    The original set of symbolic information in the symtab_command which contains
 238    the symbol and string tables must also be present when this load command is
 239    present.  When this load command is present the symbol table is organized
 240    into three groups of symbols:
 241        local symbols (static and debugging symbols) - grouped by module
 242        defined external symbols - grouped by module (sorted by name if not lib)
 243        undefined external symbols (sorted by name)
 244    In this load command there are offsets and counts to each of the three groups
 245    of symbols.
 246
 247    This load command contains a the offsets and sizes of the following new
 248    symbolic information tables:
 249        table of contents
 250        module table
 251        reference symbol table
 252        indirect symbol table
 253    The first three tables above (the table of contents, module table and
 254    reference symbol table) are only present if the file is a dynamically linked
 255    shared library.  For executable and object modules, which are files
 256    containing only one module, the information that would be in these three
 257    tables is determined as follows:
 258        table of contents - the defined external symbols are sorted by name
 259        module table - the file contains only one module so everything in the
 260                       file is part of the module.
 261        reference symbol table - is the defined and undefined external symbols
 262
 263    For dynamically linked shared library files this load command also contains
 264    offsets and sizes to the pool of relocation entries for all sections
 265    separated into two groups:
 266        external relocation entries
 267        local relocation entries
 268    For executable and object modules the relocation entries continue to hang
 269    off the section structures.  */
 270
 271 typedef struct bfd_mach_o_dysymtab_command
 272 {
 273   /* The symbols indicated by symoff and nsyms of the LC_SYMTAB load command
 274      are grouped into the following three groups:
 275        local symbols (further grouped by the module they are from)
 276        defined external symbols (further grouped by the module they are from)
 277        undefined symbols
 278
 279      The local symbols are used only for debugging.  The dynamic binding
 280      process may have to use them to indicate to the debugger the local
 281      symbols for a module that is being bound.
 282
 283      The last two groups are used by the dynamic binding process to do the
 284      binding (indirectly through the module table and the reference symbol
 285      table when this is a dynamically linked shared library file).  */
 286
 287   unsigned long ilocalsym;    /* Index to local symbols.  */
 288   unsigned long nlocalsym;    /* Number of local symbols.  */
 289   unsigned long iextdefsym;   /* Index to externally defined symbols.  */
 290   unsigned long nextdefsym;   /* Number of externally defined symbols.  */
 291   unsigned long iundefsym;    /* Index to undefined symbols.  */
 292   unsigned long nundefsym;    /* Number of undefined symbols.  */
 293
 294   /* For the for the dynamic binding process to find which module a symbol
 295      is defined in the table of contents is used (analogous to the ranlib
 296      structure in an archive) which maps defined external symbols to modules
 297      they are defined in.  This exists only in a dynamically linked shared
 298      library file.  For executable and object modules the defined external
 299      symbols are sorted by name and is use as the table of contents.  */
 300
 301   unsigned long tocoff;       /* File offset to table of contents.  */
 302   unsigned long ntoc;         /* Number of entries in table of contents.  */
 303
 304   /* To support dynamic binding of "modules" (whole object files) the symbol
 305      table must reflect the modules that the file was created from.  This is
 306      done by having a module table that has indexes and counts into the merged
 307      tables for each module.  The module structure that these two entries
 308      refer to is described below.  This exists only in a dynamically linked
 309      shared library file.  For executable and object modules the file only
 310      contains one module so everything in the file belongs to the module.  */
 311
 312   unsigned long modtaboff;    /* File offset to module table.  */
 313   unsigned long nmodtab;      /* Number of module table entries.  */
 314
 315   /* To support dynamic module binding the module structure for each module
 316      indicates the external references (defined and undefined) each module
 317      makes.  For each module there is an offset and a count into the
 318      reference symbol table for the symbols that the module references.
 319      This exists only in a dynamically linked shared library file.  For
 320      executable and object modules the defined external symbols and the
 321      undefined external symbols indicates the external references.  */
 322
 323   unsigned long extrefsymoff;  /* Offset to referenced symbol table.  */
 324   unsigned long nextrefsyms;   /* Number of referenced symbol table entries.  */
 325
 326   /* The sections that contain "symbol pointers" and "routine stubs" have
 327      indexes and (implied counts based on the size of the section and fixed
 328      size of the entry) into the "indirect symbol" table for each pointer
 329      and stub.  For every section of these two types the index into the
 330      indirect symbol table is stored in the section header in the field
 331      reserved1.  An indirect symbol table entry is simply a 32bit index into
 332      the symbol table to the symbol that the pointer or stub is referring to.
 333      The indirect symbol table is ordered to match the entries in the section.  */
 334
 335   unsigned long indirectsymoff; /* File offset to the indirect symbol table.  */
 336   unsigned long nindirectsyms;  /* Number of indirect symbol table entries.  */
 337
 338   /* To support relocating an individual module in a library file quickly the
 339      external relocation entries for each module in the library need to be
 340      accessed efficiently.  Since the relocation entries can't be accessed
 341      through the section headers for a library file they are separated into
 342      groups of local and external entries further grouped by module.  In this
 343      case the presents of this load command who's extreloff, nextrel,
 344      locreloff and nlocrel fields are non-zero indicates that the relocation
 345      entries of non-merged sections are not referenced through the section
 346      structures (and the reloff and nreloc fields in the section headers are
 347      set to zero).
 348
 349      Since the relocation entries are not accessed through the section headers
 350      this requires the r_address field to be something other than a section
 351      offset to identify the item to be relocated.  In this case r_address is
 352      set to the offset from the vmaddr of the first LC_SEGMENT command.
 353
 354      The relocation entries are grouped by module and the module table
 355      entries have indexes and counts into them for the group of external
 356      relocation entries for that the module.
 357
 358      For sections that are merged across modules there must not be any
 359      remaining external relocation entries for them (for merged sections
 360      remaining relocation entries must be local).  */
 361
 362   unsigned long extreloff;    /* Offset to external relocation entries.  */
 363   unsigned long nextrel;      /* Number of external relocation entries.  */
 364
 365   /* All the local relocation entries are grouped together (they are not
 366      grouped by their module since they are only used if the object is moved
 367      from it statically link edited address).  */
 368
 369   unsigned long locreloff;    /* Offset to local relocation entries.  */
 370   unsigned long nlocrel;      /* Number of local relocation entries.  */
 371 }
 372 bfd_mach_o_dysymtab_command;
 373
 374 /* An indirect symbol table entry is simply a 32bit index into the symbol table
 375    to the symbol that the pointer or stub is refering to.  Unless it is for a
 376    non-lazy symbol pointer section for a defined symbol which strip(1) as
 377    removed.  In which case it has the value INDIRECT_SYMBOL_LOCAL.  If the
 378    symbol was also absolute INDIRECT_SYMBOL_ABS is or'ed with that.  */
 379
 380 #define INDIRECT_SYMBOL_LOCAL 0x80000000
 381 #define INDIRECT_SYMBOL_ABS   0x40000000
 382
 383 typedef struct bfd_mach_o_thread_flavour
 384 {
 385   unsigned long flavour;
 386   bfd_vma offset;
 387   unsigned long size;
 388 }
 389 bfd_mach_o_thread_flavour;
 390
 391 typedef struct bfd_mach_o_thread_command
 392 {
 393   unsigned long nflavours;
 394   bfd_mach_o_thread_flavour *flavours;
 395   asection *section;
 396 }
 397 bfd_mach_o_thread_command;
 398
 399 typedef struct bfd_mach_o_dylinker_command
 400 {
 401   unsigned long cmd;                   /* LC_ID_DYLIB or LC_LOAD_DYLIB.  */
 402   unsigned long cmdsize;               /* Includes pathname string.  */
 403   unsigned long name_offset;           /* Offset to library's path name.  */
 404   unsigned long name_len;              /* Offset to library's path name.  */
 405   asection *section;
 406 }
 407 bfd_mach_o_dylinker_command;
 408
 409 typedef struct bfd_mach_o_dylib_command
 410 {
 411   unsigned long cmd;                   /* LC_ID_DYLIB or LC_LOAD_DYLIB.  */
 412   unsigned long cmdsize;               /* Includes pathname string.  */
 413   unsigned long name_offset;           /* Offset to library's path name.  */
 414   unsigned long name_len;              /* Offset to library's path name.  */
 415   unsigned long timestamp;             /* Library's build time stamp.  */
 416   unsigned long current_version;       /* Library's current version number.  */
 417   unsigned long compatibility_version; /* Library's compatibility vers number.  */
 418   asection *section;
 419 }
 420 bfd_mach_o_dylib_command;
 421
 422 typedef struct bfd_mach_o_prebound_dylib_command
 423 {
 424   unsigned long cmd;                 /* LC_PREBOUND_DYLIB.  */
 425   unsigned long cmdsize;             /* Includes strings.  */
 426   unsigned long name;                /* Library's path name.  */
 427   unsigned long nmodules;            /* Number of modules in library.  */
 428   unsigned long linked_modules;      /* Bit vector of linked modules.  */
 429   asection *section;
 430 }
 431 bfd_mach_o_prebound_dylib_command;
 432
 433 typedef struct bfd_mach_o_load_command
 434 {
 435   bfd_mach_o_load_command_type type;
 436   unsigned int type_required;
 437   bfd_vma offset;
 438   bfd_vma len;
 439   union
 440   {
 441     bfd_mach_o_segment_command segment;
 442     bfd_mach_o_symtab_command symtab;
 443     bfd_mach_o_dysymtab_command dysymtab;
 444     bfd_mach_o_thread_command thread;
 445     bfd_mach_o_dylib_command dylib;
 446     bfd_mach_o_dylinker_command dylinker;
 447     bfd_mach_o_prebound_dylib_command prebound_dylib;
 448   }
 449   command;
 450 }
 451 bfd_mach_o_load_command;
 452
 453 typedef struct mach_o_data_struct
 454 {
 455   bfd_mach_o_header header;
 456   bfd_mach_o_load_command *commands;
 457   unsigned long nsymbols;
 458   asymbol *symbols;
 459   unsigned long nsects;
 460   bfd_mach_o_section **sections;
 461   bfd *ibfd;
 462 }
 463 mach_o_data_struct;
 464
 465 typedef struct mach_o_data_struct bfd_mach_o_data_struct;
 466
 467 bfd_boolean        bfd_mach_o_valid  (bfd *);
 468 int                bfd_mach_o_scan_read_symtab_symbol        (bfd *, bfd_mach_o_symtab_command *, asymbol *, unsigned long);
 469 int                bfd_mach_o_scan_read_symtab_strtab        (bfd *, bfd_mach_o_symtab_command *);
 470 int                bfd_mach_o_scan_read_symtab_symbols       (bfd *, bfd_mach_o_symtab_command *);
 471 int                bfd_mach_o_scan_read_dysymtab_symbol      (bfd *, bfd_mach_o_dysymtab_command *, bfd_mach_o_symtab_command *, asymbol *, unsigned long);
 472 int                bfd_mach_o_scan_start_address             (bfd *);
 473 int                bfd_mach_o_scan                           (bfd *, bfd_mach_o_header *, bfd_mach_o_data_struct *);
 474 bfd_boolean        bfd_mach_o_mkobject                       (bfd *);
 475 const bfd_target * bfd_mach_o_object_p                       (bfd *);
 476 const bfd_target * bfd_mach_o_core_p                         (bfd *);
 477 const bfd_target * bfd_mach_o_archive_p                      (bfd *);
 478 bfd *              bfd_mach_o_openr_next_archived_file       (bfd *, bfd *);
 479 int                bfd_mach_o_lookup_section                 (bfd *, asection *, bfd_mach_o_load_command **, bfd_mach_o_section **);
 480 int                bfd_mach_o_lookup_command                 (bfd *, bfd_mach_o_load_command_type, bfd_mach_o_load_command **);
 481 unsigned long      bfd_mach_o_stack_addr                     (enum bfd_mach_o_cpu_type);
 482 int                bfd_mach_o_core_fetch_environment         (bfd *, unsigned char **, unsigned int *);
 483 char *             bfd_mach_o_core_file_failing_command      (bfd *);
 484 int                bfd_mach_o_core_file_failing_signal       (bfd *);
 485 bfd_boolean        bfd_mach_o_core_file_matches_executable_p (bfd *, bfd *);
 486
 487 extern const bfd_target mach_o_be_vec;
 488 extern const bfd_target mach_o_le_vec;
 489 extern const bfd_target mach_o_fat_vec;
 490
 491 #endif /* _BFD_MACH_O_H_ */