1 /* `a.out.adobe' differences from standard a.out files 2 3 Copyright (C) 2001-2016 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 18 MA 02110-1301, USA. */ 19 20 #ifndef __A_OUT_ADOBE_H__ 21 #define __A_OUT_ADOBE_H__ 22 23 #define BYTES_IN_WORD 4 24 25 /* Struct external_exec is the same. */ 26 27 /* This is the layout on disk of the 32-bit or 64-bit exec header. */ 28 29 struct external_exec 30 { 31 bfd_byte e_info[4]; /* magic number and stuff */ 32 bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes */ 33 bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes */ 34 bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes */ 35 bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes */ 36 bfd_byte e_entry[BYTES_IN_WORD]; /* start address */ 37 bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info */ 38 bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info */ 39 }; 40 41 #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7) 42 43 /* Magic numbers for a.out files */ 44 45 #undef ZMAGIC 46 #define ZMAGIC 0xAD0BE /* Cute, eh? */ 47 #undef OMAGIC 48 #undef NMAGIC 49 50 #define N_BADMAG(x) ((x)->a_info != ZMAGIC) 51 52 /* By default, segment size is constant. But some machines override this 53 to be a function of the a.out header (e.g. machine type). */ 54 #ifndef N_SEGSIZE 55 #define N_SEGSIZE(x) SEGMENT_SIZE 56 #endif 57 #undef N_SEGSIZE /* FIXMEXXXX */ 58 59 /* Segment information for the a.out.Adobe format is specified after the 60 file header. It contains N segment descriptors, followed by one with 61 a type of zero. 62 63 The actual text of the segments starts at N_TXTOFF in the file, 64 regardless of how many or how few segment headers there are. */ 65 66 struct external_segdesc { 67 unsigned char e_type[1]; 68 unsigned char e_size[3]; 69 unsigned char e_virtbase[4]; 70 unsigned char e_filebase[4]; 71 }; 72 73 struct internal_segdesc { 74 unsigned int a_type:8; /* Segment type N_TEXT, N_DATA, 0 */ 75 unsigned int a_size:24; /* Segment size */ 76 bfd_vma a_virtbase; /* Virtual address */ 77 unsigned int a_filebase; /* Base address in object file */ 78 }; 79 80 #define N_TXTADDR(x) is_this_really_unused? 81 82 /* This is documented to be at 1024, but appears to really be at 2048. 83 FIXME?! */ 84 #define N_TXTOFF(x) 2048 85 86 #define N_TXTSIZE(x) ((x)->a_text) 87 88 #define N_DATADDR(x) is_this_really_unused? 89 90 #define N_BSSADDR(x) is_this_really_unused? 91 92 /* Offsets of the various portions of the file after the text segment. */ 93 94 #define N_DATOFF(x) ( N_TXTOFF(x) + N_TXTSIZE(x) ) 95 #define N_TRELOFF(x) ( N_DATOFF(x) + (x)->a_data ) 96 #define N_DRELOFF(x) ( N_TRELOFF(x) + (x)->a_trsize ) 97 #define N_SYMOFF(x) ( N_DRELOFF(x) + (x)->a_drsize ) 98 #define N_STROFF(x) ( N_SYMOFF(x) + (x)->a_syms ) 99 100 /* Symbols */ 102 struct external_nlist { 103 bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of name */ 104 bfd_byte e_type[1]; /* type of symbol */ 105 bfd_byte e_other[1]; /* misc info (usually empty) */ 106 bfd_byte e_desc[2]; /* description field */ 107 bfd_byte e_value[BYTES_IN_WORD]; /* value of symbol */ 108 }; 109 110 #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD) 111 112 struct internal_nlist { 113 unsigned long n_strx; /* index into string table of name */ 114 unsigned char n_type; /* type of symbol */ 115 unsigned char n_other; /* misc info (usually empty) */ 116 unsigned short n_desc; /* description field */ 117 bfd_vma n_value; /* value of symbol */ 118 }; 119 120 /* The n_type field is the symbol type, containing: */ 121 122 #define N_UNDF 0 /* Undefined symbol */ 123 #define N_ABS 2 /* Absolute symbol -- defined at particular addr */ 124 #define N_TEXT 4 /* Text sym -- defined at offset in text seg */ 125 #define N_DATA 6 /* Data sym -- defined at offset in data seg */ 126 #define N_BSS 8 /* BSS sym -- defined at offset in zero'd seg */ 127 #define N_COMM 0x12 /* Common symbol (visible after shared lib dynlink) */ 128 #define N_FN 0x1f /* File name of .o file */ 129 #define N_FN_SEQ 0x0C /* N_FN from Sequent compilers (sigh) */ 130 /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT, 131 N_DATA, or N_BSS. When the low-order bit of other types is set, 132 (e.g. N_WARNING versus N_FN), they are two different types. */ 133 #define N_EXT 1 /* External symbol (as opposed to local-to-this-file) */ 134 #define N_TYPE 0x1e 135 #define N_STAB 0xe0 /* If any of these bits are on, it's a debug symbol */ 136 137 #define N_INDR 0x0a 138 139 /* The following symbols refer to set elements. 140 All the N_SET[ATDB] symbols with the same name form one set. 141 Space is allocated for the set in the text section, and each set 142 elements value is stored into one word of the space. 143 The first word of the space is the length of the set (number of elements). 144 145 The address of the set is made into an N_SETV symbol 146 whose name is the same as the name of the set. 147 This symbol acts like a N_DATA global symbol 148 in that it can satisfy undefined external references. */ 149 150 /* These appear as input to LD, in a .o file. */ 151 #define N_SETA 0x14 /* Absolute set element symbol */ 152 #define N_SETT 0x16 /* Text set element symbol */ 153 #define N_SETD 0x18 /* Data set element symbol */ 154 #define N_SETB 0x1A /* Bss set element symbol */ 155 156 /* This is output from LD. */ 157 #define N_SETV 0x1C /* Pointer to set vector in data area. */ 158 159 /* Warning symbol. The text gives a warning message, the next symbol 160 in the table will be undefined. When the symbol is referenced, the 161 message is printed. */ 162 163 #define N_WARNING 0x1e 164 165 /* Relocations 166 167 There are two types of relocation flavours for a.out systems, 168 standard and extended. The standard form is used on systems where the 169 instruction has room for all the bits of an offset to the operand, whilst 170 the extended form is used when an address operand has to be split over n 171 instructions. Eg, on the 68k, each move instruction can reference 172 the target with a displacement of 16 or 32 bits. On the sparc, move 173 instructions use an offset of 14 bits, so the offset is stored in 174 the reloc field, and the data in the section is ignored. 175 */ 176 177 /* This structure describes a single relocation to be performed. 178 The text-relocation section of the file is a vector of these structures, 179 all of which apply to the text section. 180 Likewise, the data-relocation section applies to the data section. */ 181 182 struct reloc_std_external { 183 bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ 184 bfd_byte r_index[3]; /* symbol table index of symbol */ 185 bfd_byte r_type[1]; /* relocation type */ 186 }; 187 188 #define RELOC_STD_BITS_PCREL_BIG 0x80 189 #define RELOC_STD_BITS_PCREL_LITTLE 0x01 190 191 #define RELOC_STD_BITS_LENGTH_BIG 0x60 192 #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ 193 #define RELOC_STD_BITS_LENGTH_LITTLE 0x06 194 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 195 196 #define RELOC_STD_BITS_EXTERN_BIG 0x10 197 #define RELOC_STD_BITS_EXTERN_LITTLE 0x08 198 199 #define RELOC_STD_BITS_BASEREL_BIG 0x08 200 #define RELOC_STD_BITS_BASEREL_LITTLE 0x08 201 202 #define RELOC_STD_BITS_JMPTABLE_BIG 0x04 203 #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 204 205 #define RELOC_STD_BITS_RELATIVE_BIG 0x02 206 #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 207 208 #define RELOC_STD_SIZE (BYTES_IN_WORD + 3 + 1) /* Bytes per relocation entry */ 209 210 struct reloc_std_internal 211 { 212 bfd_vma r_address; /* Address (within segment) to be relocated. */ 213 /* The meaning of r_symbolnum depends on r_extern. */ 214 unsigned int r_symbolnum:24; 215 /* Nonzero means value is a pc-relative offset 216 and it should be relocated for changes in its own address 217 as well as for changes in the symbol or section specified. */ 218 unsigned int r_pcrel:1; 219 /* Length (as exponent of 2) of the field to be relocated. 220 Thus, a value of 2 indicates 1<<2 bytes. */ 221 unsigned int r_length:2; 222 /* 1 => relocate with value of symbol. 223 r_symbolnum is the index of the symbol 224 in files the symbol table. 225 0 => relocate with the address of a segment. 226 r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS 227 (the N_EXT bit may be set also, but signifies nothing). */ 228 unsigned int r_extern:1; 229 /* The next three bits are for SunOS shared libraries, and seem to 230 be undocumented. */ 231 unsigned int r_baserel:1; /* Linkage table relative */ 232 unsigned int r_jmptable:1; /* pc-relative to jump table */ 233 unsigned int r_relative:1; /* "relative relocation" */ 234 /* unused */ 235 unsigned int r_pad:1; /* Padding -- set to zero */ 236 }; 237 238 239 /* EXTENDED RELOCS */ 240 241 struct reloc_ext_external { 242 bfd_byte r_address[BYTES_IN_WORD]; /* offset of of data to relocate */ 243 bfd_byte r_index[3]; /* symbol table index of symbol */ 244 bfd_byte r_type[1]; /* relocation type */ 245 bfd_byte r_addend[BYTES_IN_WORD]; /* datum addend */ 246 }; 247 248 #define RELOC_EXT_BITS_EXTERN_BIG 0x80 249 #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 250 251 #define RELOC_EXT_BITS_TYPE_BIG 0x1F 252 #define RELOC_EXT_BITS_TYPE_SH_BIG 0 253 #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 254 #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 255 256 /* Bytes per relocation entry */ 257 #define RELOC_EXT_SIZE (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) 258 259 enum reloc_type 260 { 261 /* simple relocations */ 262 RELOC_8, /* data[0:7] = addend + sv */ 263 RELOC_16, /* data[0:15] = addend + sv */ 264 RELOC_32, /* data[0:31] = addend + sv */ 265 /* pc-rel displacement */ 266 RELOC_DISP8, /* data[0:7] = addend - pc + sv */ 267 RELOC_DISP16, /* data[0:15] = addend - pc + sv */ 268 RELOC_DISP32, /* data[0:31] = addend - pc + sv */ 269 /* Special */ 270 RELOC_WDISP30, /* data[0:29] = (addend + sv - pc)>>2 */ 271 RELOC_WDISP22, /* data[0:21] = (addend + sv - pc)>>2 */ 272 RELOC_HI22, /* data[0:21] = (addend + sv)>>10 */ 273 RELOC_22, /* data[0:21] = (addend + sv) */ 274 RELOC_13, /* data[0:12] = (addend + sv) */ 275 RELOC_LO10, /* data[0:9] = (addend + sv) */ 276 RELOC_SFA_BASE, 277 RELOC_SFA_OFF13, 278 /* P.I.C. (base-relative) */ 279 RELOC_BASE10, /* Not sure - maybe we can do this the */ 280 RELOC_BASE13, /* right way now */ 281 RELOC_BASE22, 282 /* for some sort of pc-rel P.I.C. (?) */ 283 RELOC_PC10, 284 RELOC_PC22, 285 /* P.I.C. jump table */ 286 RELOC_JMP_TBL, 287 /* reputedly for shared libraries somehow */ 288 RELOC_SEGOFF16, 289 RELOC_GLOB_DAT, 290 RELOC_JMP_SLOT, 291 RELOC_RELATIVE, 292 293 RELOC_11, 294 RELOC_WDISP2_14, 295 RELOC_WDISP19, 296 RELOC_HHI22, /* data[0:21] = (addend + sv) >> 42 */ 297 RELOC_HLO10, /* data[0:9] = (addend + sv) >> 32 */ 298 299 /* 29K relocation types */ 300 RELOC_JUMPTARG, 301 RELOC_CONST, 302 RELOC_CONSTH, 303 304 NO_RELOC 305 }; 306 307 308 struct reloc_internal { 309 bfd_vma r_address; /* offset of of data to relocate */ 310 long r_index; /* symbol table index of symbol */ 311 enum reloc_type r_type; /* relocation type */ 312 bfd_vma r_addend; /* datum addend */ 313 }; 314 315 #endif /* __A_OUT_ADOBE_H__ */ 316
