Home | History | Annotate | Download | only in mach-o
      1 /* Mach-O support for BFD.
      2    Copyright (C) 2011-2014 Free Software Foundation, Inc.
      3 
      4    This file is part of BFD, the Binary File Descriptor library.
      5 
      6    This program is free software; you can redistribute it and/or modify
      7    it under the terms of the GNU General Public License as published by
      8    the Free Software Foundation; either version 3 of the License, or
      9    (at your option) any later version.
     10 
     11    This program is distributed in the hope that it will be useful,
     12    but WITHOUT ANY WARRANTY; without even the implied warranty of
     13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14    GNU General Public License for more details.
     15 
     16    You should have received a copy of the GNU General Public License
     17    along with this program; if not, write to the Free Software
     18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
     19    MA 02110-1301, USA.  */
     20 
     21 #ifndef _MACH_O_EXTERNAL_H
     22 #define _MACH_O_EXTERNAL_H
     23 
     24 struct mach_o_header_external
     25 {
     26   unsigned char magic[4];	/* Magic number.  */
     27   unsigned char cputype[4];	/* CPU that this object is for.  */
     28   unsigned char cpusubtype[4];	/* CPU subtype.  */
     29   unsigned char filetype[4];	/* Type of file.  */
     30   unsigned char ncmds[4];	/* Number of load commands.  */
     31   unsigned char sizeofcmds[4];	/* Total size of load commands.  */
     32   unsigned char flags[4];	/* Flags.  */
     33   unsigned char reserved[4];	/* Reserved (on 64-bit version only).  */
     34 };
     35 
     36 #define BFD_MACH_O_HEADER_SIZE 28
     37 #define BFD_MACH_O_HEADER_64_SIZE 32
     38 
     39 /* 32-bit section header.  */
     40 
     41 struct mach_o_section_32_external
     42 {
     43   unsigned char sectname[16];   /* Section name.  */
     44   unsigned char segname[16];    /* Segment that the section belongs to.  */
     45   unsigned char addr[4];        /* Address of this section in memory.  */
     46   unsigned char size[4];        /* Size in bytes of this section.  */
     47   unsigned char offset[4];      /* File offset of this section.  */
     48   unsigned char align[4];       /* log2 of this section's alignment.  */
     49   unsigned char reloff[4];      /* File offset of this section's relocs.  */
     50   unsigned char nreloc[4];      /* Number of relocs for this section.  */
     51   unsigned char flags[4];       /* Section flags/attributes.  */
     52   unsigned char reserved1[4];
     53   unsigned char reserved2[4];
     54 };
     55 #define BFD_MACH_O_SECTION_SIZE 68
     56 
     57 /* 64-bit section header.  */
     58 
     59 struct mach_o_section_64_external
     60 {
     61   unsigned char sectname[16];   /* Section name.  */
     62   unsigned char segname[16];    /* Segment that the section belongs to.  */
     63   unsigned char addr[8];        /* Address of this section in memory.  */
     64   unsigned char size[8];        /* Size in bytes of this section.  */
     65   unsigned char offset[4];      /* File offset of this section.  */
     66   unsigned char align[4];       /* log2 of this section's alignment.  */
     67   unsigned char reloff[4];      /* File offset of this section's relocs.  */
     68   unsigned char nreloc[4];      /* Number of relocs for this section.  */
     69   unsigned char flags[4];       /* Section flags/attributes.  */
     70   unsigned char reserved1[4];
     71   unsigned char reserved2[4];
     72   unsigned char reserved3[4];
     73 };
     74 #define BFD_MACH_O_SECTION_64_SIZE 80
     75 
     76 struct mach_o_load_command_external
     77 {
     78   unsigned char cmd[4];         /* The type of load command.  */
     79   unsigned char cmdsize[4];     /* Size in bytes of entire command.  */
     80 };
     81 #define BFD_MACH_O_LC_SIZE 8
     82 
     83 struct mach_o_segment_command_32_external
     84 {
     85   unsigned char segname[16];    /* Name of this segment.  */
     86   unsigned char vmaddr[4];      /* Virtual memory address of this segment.  */
     87   unsigned char vmsize[4];      /* Size there, in bytes.  */
     88   unsigned char fileoff[4];     /* Offset in bytes of the data to be mapped.  */
     89   unsigned char filesize[4];    /* Size in bytes on disk.  */
     90   unsigned char maxprot[4];     /* Maximum permitted vm protection.  */
     91   unsigned char initprot[4];    /* Initial vm protection.  */
     92   unsigned char nsects[4];      /* Number of sections in this segment.  */
     93   unsigned char flags[4];       /* Flags that affect the loading.  */
     94 };
     95 #define BFD_MACH_O_LC_SEGMENT_SIZE 56 /* Include the header.  */
     96 
     97 struct mach_o_segment_command_64_external
     98 {
     99   unsigned char segname[16];    /* Name of this segment.  */
    100   unsigned char vmaddr[8];      /* Virtual memory address of this segment.  */
    101   unsigned char vmsize[8];      /* Size there, in bytes.  */
    102   unsigned char fileoff[8];     /* Offset in bytes of the data to be mapped.  */
    103   unsigned char filesize[8];    /* Size in bytes on disk.  */
    104   unsigned char maxprot[4];     /* Maximum permitted vm protection.  */
    105   unsigned char initprot[4];    /* Initial vm protection.  */
    106   unsigned char nsects[4];      /* Number of sections in this segment.  */
    107   unsigned char flags[4];       /* Flags that affect the loading.  */
    108 };
    109 #define BFD_MACH_O_LC_SEGMENT_64_SIZE 72 /* Include the header.  */
    110 
    111 struct mach_o_reloc_info_external
    112 {
    113   unsigned char r_address[4];
    114   unsigned char r_symbolnum[4];
    115 };
    116 #define BFD_MACH_O_RELENT_SIZE 8
    117 
    118 /* Relocations are based on 'address' being a section offset and an assumption
    119    that sections are never more than 2^24-1 bytes in size.  Relocation data
    120    also carry information on type/size/PC-relative/extern and whether scattered
    121    or not [stored in the MSB of the r_address].  */
    122 
    123 #define BFD_MACH_O_SR_SCATTERED		0x80000000
    124 
    125 /* For a non-scattered reloc, the relocation info is found in r_symbolnum.
    126    Bytes 1 to 3 contain the symbol number (0xffffff, in a non-scattered PAIR).
    127    Byte 4 contains the relocation info - but with differing bit-positions
    128    dependent on target endian-ness - as below.  */
    129 
    130 #define BFD_MACH_O_LE_PCREL		0x01
    131 #define BFD_MACH_O_LE_LENGTH_SHIFT	1
    132 #define BFD_MACH_O_LE_EXTERN		0x08
    133 #define BFD_MACH_O_LE_TYPE_SHIFT	4
    134 
    135 #define BFD_MACH_O_BE_PCREL		0x80
    136 #define BFD_MACH_O_BE_LENGTH_SHIFT	5
    137 #define BFD_MACH_O_BE_EXTERN		0x10
    138 #define BFD_MACH_O_BE_TYPE_SHIFT	0
    139 
    140 /* The field sizes are the same for both BE and LE.  */
    141 #define BFD_MACH_O_LENGTH_MASK		0x03
    142 #define BFD_MACH_O_TYPE_MASK		0x0f
    143 
    144 /* For a scattered reloc entry the info is contained in r_address.  There
    145    is no need to discriminate on target endian-ness, since the design was
    146    arranged to produce the same layout on both.  Scattered relocations are
    147    only used for local items, therefore there is no 'extern' field.  */
    148 
    149 #define BFD_MACH_O_SR_PCREL		0x40000000
    150 #define BFD_MACH_O_GET_SR_LENGTH(s)	(((s) >> 28) & 0x3)
    151 #define BFD_MACH_O_GET_SR_TYPE(s)	(((s) >> 24) & 0x0f)
    152 #define BFD_MACH_O_GET_SR_ADDRESS(s)	((s) & 0x00ffffff)
    153 #define BFD_MACH_O_SET_SR_LENGTH(l)	(((l) & 0x3) << 28)
    154 #define BFD_MACH_O_SET_SR_TYPE(t)	(((t) & 0xf) << 24)
    155 #define BFD_MACH_O_SET_SR_ADDRESS(s)	((s) & 0x00ffffff)
    156 
    157 struct mach_o_symtab_command_external
    158 {
    159   unsigned char symoff[4];	/* File offset of the symbol table.  */
    160   unsigned char nsyms[4];	/* Number of symbols.  */
    161   unsigned char stroff[4];	/* File offset of the string table.  */
    162   unsigned char strsize[4];	/* String table size.  */
    163 };
    164 
    165 struct mach_o_nlist_external
    166 {
    167   unsigned char n_strx[4];
    168   unsigned char n_type[1];
    169   unsigned char n_sect[1];
    170   unsigned char n_desc[2];
    171   unsigned char n_value[4];
    172 };
    173 #define BFD_MACH_O_NLIST_SIZE 12
    174 
    175 struct mach_o_nlist_64_external
    176 {
    177   unsigned char n_strx[4];
    178   unsigned char n_type[1];
    179   unsigned char n_sect[1];
    180   unsigned char n_desc[2];
    181   unsigned char n_value[8];
    182 };
    183 #define BFD_MACH_O_NLIST_64_SIZE 16
    184 
    185 struct mach_o_thread_command_external
    186 {
    187   unsigned char flavour[4];
    188   unsigned char count[4];
    189 };
    190 
    191 /* For commands that just have a string or a path.  */
    192 struct mach_o_str_command_external
    193 {
    194   unsigned char str[4];
    195 };
    196 
    197 struct mach_o_dylib_command_external
    198 {
    199   unsigned char name[4];
    200   unsigned char timestamp[4];
    201   unsigned char current_version[4];
    202   unsigned char compatibility_version[4];
    203 };
    204 
    205 struct mach_o_dysymtab_command_external
    206 {
    207   unsigned char ilocalsym[4];	/* Index of.  */
    208   unsigned char nlocalsym[4];	/* Number of.  */
    209   unsigned char iextdefsym[4];
    210   unsigned char nextdefsym[4];
    211   unsigned char iundefsym[4];
    212   unsigned char nundefsym[4];
    213   unsigned char tocoff[4];
    214   unsigned char ntoc[4];
    215   unsigned char modtaboff[4];
    216   unsigned char nmodtab[4];
    217   unsigned char extrefsymoff[4];
    218   unsigned char nextrefsyms[4];
    219   unsigned char indirectsymoff[4];
    220   unsigned char nindirectsyms[4];
    221   unsigned char extreloff[4];
    222   unsigned char nextrel[4];
    223   unsigned char locreloff[4];
    224   unsigned char nlocrel[4];
    225 };
    226 
    227 struct mach_o_dylib_module_external
    228 {
    229   unsigned char module_name[4];
    230   unsigned char iextdefsym[4];
    231   unsigned char nextdefsym[4];
    232   unsigned char irefsym[4];
    233   unsigned char nrefsym[4];
    234   unsigned char ilocalsym[4];
    235   unsigned char nlocalsym[4];
    236   unsigned char iextrel[4];
    237   unsigned char nextrel[4];
    238   unsigned char iinit_iterm[4];
    239   unsigned char ninit_nterm[4];
    240   unsigned char objc_module_info_addr[4];
    241   unsigned char objc_module_info_size[4];
    242 };
    243 #define BFD_MACH_O_DYLIB_MODULE_SIZE 52
    244 
    245 struct mach_o_dylib_module_64_external
    246 {
    247   unsigned char module_name[4];
    248   unsigned char iextdefsym[4];
    249   unsigned char nextdefsym[4];
    250   unsigned char irefsym[4];
    251   unsigned char nrefsym[4];
    252   unsigned char ilocalsym[4];
    253   unsigned char nlocalsym[4];
    254   unsigned char iextrel[4];
    255   unsigned char nextrel[4];
    256   unsigned char iinit_iterm[4];
    257   unsigned char ninit_nterm[4];
    258   unsigned char objc_module_info_size[4];
    259   unsigned char objc_module_info_addr[8];
    260 };
    261 #define BFD_MACH_O_DYLIB_MODULE_64_SIZE 56
    262 
    263 struct mach_o_dylib_table_of_contents_external
    264 {
    265   unsigned char symbol_index[4];
    266   unsigned char module_index[4];
    267 };
    268 #define BFD_MACH_O_TABLE_OF_CONTENT_SIZE 8
    269 
    270 struct mach_o_linkedit_data_command_external
    271 {
    272   unsigned char dataoff[4];
    273   unsigned char datasize[4];
    274 };
    275 
    276 struct mach_o_dyld_info_command_external
    277 {
    278   unsigned char rebase_off[4];
    279   unsigned char rebase_size[4];
    280   unsigned char bind_off[4];
    281   unsigned char bind_size[4];
    282   unsigned char weak_bind_off[4];
    283   unsigned char weak_bind_size[4];
    284   unsigned char lazy_bind_off[4];
    285   unsigned char lazy_bind_size[4];
    286   unsigned char export_off[4];
    287   unsigned char export_size[4];
    288 };
    289 
    290 struct mach_o_prebound_dylib_command_external
    291 {
    292   unsigned char name[4];
    293   unsigned char nmodules[4];
    294   unsigned char linked_modules[4];
    295 };
    296 
    297 struct mach_o_prebind_cksum_command_external
    298 {
    299   unsigned char cksum[4];
    300 };
    301 
    302 struct mach_o_twolevel_hints_command_external
    303 {
    304   unsigned char offset[4];
    305   unsigned char nhints[4];
    306 };
    307 
    308 struct mach_o_version_min_command_external
    309 {
    310   unsigned char version[4];
    311   unsigned char reserved[4];
    312 };
    313 
    314 struct mach_o_encryption_info_command_external
    315 {
    316   unsigned char cryptoff[4];	/* File offset of the encrypted area.  */
    317   unsigned char cryptsize[4];	/* Size of the encrypted area.  */
    318   unsigned char cryptid[4];	/* Encryption method.  */
    319 };
    320 
    321 struct mach_o_fvmlib_command_external
    322 {
    323   unsigned char name[4];	/* Offset of the name.  */
    324   unsigned char minor_version[4];
    325   unsigned char header_addr[4];
    326 };
    327 
    328 struct mach_o_entry_point_command_external
    329 {
    330   unsigned char entryoff[8];	/* File offset of the entry point.  */
    331   unsigned char stacksize[8];   /* Initial stack size, if no null.  */
    332 };
    333 
    334 struct mach_o_source_version_command_external
    335 {
    336   unsigned char version[8];	/* Version A.B.C.D.E, with 10 bits for B-E,
    337 				   and 24 bits for A.  */
    338 };
    339 
    340 /* The LD_DATA_IN_CODE command use a linkedit_data_command that points to
    341    a table of entries.  */
    342 
    343 struct mach_o_data_in_code_entry_external
    344 {
    345   unsigned char offset[4];	/* Offset from the mach_header. */
    346   unsigned char length[2];	/* Number of bytes.  */
    347   unsigned char kind[2];	/* Kind.  See BFD_MACH_O_DICE_ values.  */
    348 };
    349 
    350 struct mach_o_fat_header_external
    351 {
    352   unsigned char magic[4];
    353   unsigned char nfat_arch[4];	/* Number of components.  */
    354 };
    355 
    356 struct mach_o_fat_arch_external
    357 {
    358   unsigned char cputype[4];
    359   unsigned char cpusubtype[4];
    360   unsigned char offset[4];	/* File offset of the member.  */
    361   unsigned char size[4];	/* Size of the member.  */
    362   unsigned char align[4];	/* Power of 2.  */
    363 };
    364 
    365 #endif /* _MACH_O_EXTERNAL_H */
    366