1 /* This file is aout_gnu.h 2 3 Copyright (C) 1987-2016 Free Software Foundation, Inc. 4 5 This file is part of GAS, the GNU Assembler. 6 7 GAS 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, or (at your option) 10 any later version. 11 12 GAS 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 GAS; see the file COPYING. If not, write to 19 the Free Software Foundation, 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 #ifndef __A_OUT_GNU_H__ 23 #define __A_OUT_GNU_H__ 24 25 /* There are two main flavours of a.out, one which uses the standard 26 relocations, and one which uses extended relocations. 27 28 Today, the extended reloc uses are 29 TC_SPARC 30 31 each must define the enum reloc_type 32 33 */ 34 35 #define USE_EXTENDED_RELOC defined(TC_SPARC) 36 37 #if defined(TC_SPARC) 38 enum reloc_type 39 { 40 RELOC_8, RELOC_16, RELOC_32,/* simple relocations */ 41 RELOC_DISP8, RELOC_DISP16, RELOC_DISP32, /* pc-rel displacement */ 42 RELOC_WDISP30, RELOC_WDISP22, 43 RELOC_HI22, RELOC_22, 44 RELOC_13, RELOC_LO10, 45 RELOC_SFA_BASE, RELOC_SFA_OFF13, 46 RELOC_BASE10, RELOC_BASE13, RELOC_BASE22, /* P.I.C. (base-relative) */ 47 RELOC_PC10, RELOC_PC22, /* for some sort of pc-rel P.I.C. (?) */ 48 RELOC_JMP_TBL, /* P.I.C. jump table */ 49 RELOC_SEGOFF16, /* reputedly for shared libraries somehow */ 50 RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE, 51 RELOC_10, RELOC_11, 52 RELOC_WDISP2_14, 53 RELOC_WDISP19, 54 RELOC_HHI22, 55 RELOC_HLO10, 56 57 /* 29K relocation types */ 58 RELOC_JUMPTARG, RELOC_CONST, RELOC_CONSTH, 59 60 RELOC_WDISP14, RELOC_WDISP21, 61 62 NO_RELOC 63 }; 64 65 #endif /* TC_SPARC */ 66 67 #define __GNU_EXEC_MACROS__ 68 69 #ifndef __STRUCT_EXEC_OVERRIDE__ 70 71 /* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix 72 "struct exec". Don't assume that on this machine, the "struct exec" 73 will lay out the same sizes or alignments. */ 74 75 struct exec_bytes 76 { 77 unsigned char a_info[4]; 78 unsigned char a_text[4]; 79 unsigned char a_data[4]; 80 unsigned char a_bss[4]; 81 unsigned char a_syms[4]; 82 unsigned char a_entry[4]; 83 unsigned char a_trsize[4]; 84 unsigned char a_drsize[4]; 85 }; 86 87 /* How big the "struct exec" is on disk */ 88 #define EXEC_BYTES_SIZE (8 * 4) 89 90 /* This is the layout in memory of a "struct exec" while we process it. */ 91 92 struct exec 93 { 94 unsigned long a_info; /* Use macros N_MAGIC, etc for access */ 95 unsigned a_text; /* length of text, in bytes */ 96 unsigned a_data; /* length of data, in bytes */ 97 unsigned a_bss; /* length of uninitialized data area for file, in bytes */ 98 unsigned a_syms; /* length of symbol table data in file, in bytes */ 99 unsigned a_entry; /* start address */ 100 unsigned a_trsize; /* length of relocation info for text, in bytes */ 101 unsigned a_drsize; /* length of relocation info for data, in bytes */ 102 }; 103 104 #endif /* __STRUCT_EXEC_OVERRIDE__ */ 105 106 /* these go in the N_MACHTYPE field */ 107 /* These symbols could be defined by code from Suns...punt 'em */ 108 #undef M_UNKNOWN 109 #undef M_68010 110 #undef M_68020 111 #undef M_SPARC 112 enum machine_type 113 { 114 M_UNKNOWN = 0, 115 M_68010 = 1, 116 M_68020 = 2, 117 M_SPARC = 3, 118 /* skip a bunch so we don't run into any of sun's numbers */ 119 M_386 = 100, 120 M_29K = 101, 121 M_RS6000 = 102, /* IBM RS/6000 */ 122 M_VAX4K_NETBSD = 150, 123 /* HP/BSD formats */ 124 M_HP200 = 200, /* hp200 (68010) BSD binary */ 125 M_HP300 = 300, /* hp300 (68020+68881) BSD binary */ 126 M_HPUX23 = 0x020C /* hp200/300 HPUX binary */ 127 }; 128 129 #define N_MAGIC(execp) ((execp)->a_info & 0xffff) 130 #define N_MACHTYPE(execp) ((enum machine_type)(((execp)->a_info >> 16) & 0xff)) 131 #define N_FLAGS(execp) (((execp)->a_info >> 24) & 0xff) 132 #define N_SET_INFO(execp, magic, type, flags) \ 133 ((execp)->a_info = ((magic) & 0xffff) \ 134 | (((int)(type) & 0xff) << 16) \ 135 | (((flags) & 0xff) << 24)) 136 #define N_SET_MAGIC(execp, magic) \ 137 ((execp)->a_info = (((execp)->a_info & 0xffff0000) | ((magic) & 0xffff))) 138 139 #define N_SET_MACHTYPE(execp, machtype) \ 140 ((execp)->a_info = \ 141 ((execp)->a_info & 0xff00ffff) | ((((int) (machtype)) & 0xff) << 16)) 142 143 #define N_SET_FLAGS(execp, flags) \ 144 ((execp)->a_info = \ 145 ((execp)->a_info & 0x00ffffff) | (((flags) & 0xff) << 24)) 146 147 /* Code indicating object file or impure executable. */ 148 #ifndef OMAGIC 149 #define OMAGIC 0407 150 #endif 151 /* Code indicating pure executable. */ 152 #define NMAGIC 0410 153 /* Code indicating demand-paged executable. */ 154 #define ZMAGIC 0413 155 156 /* Virtual Address of text segment from the a.out file. For OMAGIC, 157 (almost always "unlinked .o's" these days), should be zero. 158 For linked files, should reflect reality if we know it. */ 159 160 #ifndef N_TXTADDR 161 #define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR) 162 #endif 163 164 #ifndef N_BADMAG 165 #define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \ 166 && N_MAGIC(x) != NMAGIC \ 167 && N_MAGIC(x) != ZMAGIC) 168 #endif 169 170 /* By default, segment size is constant. But on some machines, it can 171 be a function of the a.out header (e.g. machine type). */ 172 #ifndef N_SEGSIZE 173 #define N_SEGSIZE(x) SEGMENT_SIZE 174 #endif 175 176 /* This complexity is for encapsulated COFF support */ 177 #ifndef _N_HDROFF 178 #define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec)) 179 #endif 180 181 #ifndef N_TXTOFF 182 #define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \ 183 _N_HDROFF((x)) + sizeof (struct exec) : \ 184 sizeof (struct exec)) 185 #endif 186 187 #ifndef N_DATOFF 188 #define N_DATOFF(x) ( N_TXTOFF(x) + (x)->a_text ) 189 #endif 190 191 #ifndef N_TRELOFF 192 #define N_TRELOFF(x) ( N_DATOFF(x) + (x)->a_data ) 193 #endif 194 195 #ifndef N_DRELOFF 196 #define N_DRELOFF(x) ( N_TRELOFF(x) + (x)->a_trsize ) 197 #endif 198 199 #ifndef N_SYMOFF 200 #define N_SYMOFF(x) ( N_DRELOFF(x) + (x)->a_drsize ) 201 #endif 202 203 #ifndef N_STROFF 204 #define N_STROFF(x) ( N_SYMOFF(x) + (x)->a_syms ) 205 #endif 206 207 /* Address of text segment in memory after it is loaded. */ 208 #ifndef N_TXTADDR 209 #define N_TXTADDR(x) 0 210 #endif 211 212 #ifndef N_DATADDR 213 #define N_DATADDR(x) \ 214 (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x)->a_text) \ 215 : (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x)->a_text-1) & ~(N_SEGSIZE(x)-1)))) 216 #endif 217 218 /* Address of bss segment in memory after it is loaded. */ 219 #define N_BSSADDR(x) (N_DATADDR(x) + (x)->a_data) 220 221 struct nlist 222 { 223 union 224 { 225 char *n_name; 226 struct nlist *n_next; 227 long n_strx; 228 } 229 n_un; 230 unsigned char n_type; 231 char n_other; 232 short n_desc; 233 unsigned long n_value; 234 }; 235 236 #define N_UNDF 0 237 #define N_ABS 2 238 #define N_TEXT 4 239 #define N_DATA 6 240 #define N_BSS 8 241 #define N_COMM 0x12 /* common (visible in shared lib commons) */ 242 #define N_FN 0x1F /* File name of a .o file */ 243 244 /* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT, 245 N_DATA, or N_BSS. When the low-order bit of other types is set, 246 (e.g. N_WARNING versus N_FN), they are two different types. */ 247 #define N_EXT 1 248 #define N_TYPE 036 249 #define N_STAB 0340 250 251 /* The following type indicates the definition of a symbol as being 252 an indirect reference to another symbol. The other symbol 253 appears as an undefined reference, immediately following this symbol. 254 255 Indirection is asymmetrical. The other symbol's value will be used 256 to satisfy requests for the indirect symbol, but not vice versa. 257 If the other symbol does not have a definition, libraries will 258 be searched to find a definition. */ 259 260 #define N_INDR 0xa 261 262 /* The following symbols refer to set elements. 263 All the N_SET[ATDB] symbols with the same name form one set. 264 Space is allocated for the set in the text section, and each set 265 element's value is stored into one word of the space. 266 The first word of the space is the length of the set (number of elements). 267 268 The address of the set is made into an N_SETV symbol 269 whose name is the same as the name of the set. 270 This symbol acts like a N_DATA global symbol 271 in that it can satisfy undefined external references. */ 272 273 /* These appear as input to LD, in a .o file. */ 274 #define N_SETA 0x14 /* Absolute set element symbol */ 275 #define N_SETT 0x16 /* Text set element symbol */ 276 #define N_SETD 0x18 /* Data set element symbol */ 277 #define N_SETB 0x1A /* Bss set element symbol */ 278 279 /* This is output from LD. */ 280 #define N_SETV 0x1C /* Pointer to set vector in data area. */ 281 282 /* Warning symbol. The text gives a warning message, the next symbol 283 in the table will be undefined. When the symbol is referenced, the 284 message is printed. */ 285 286 #define N_WARNING 0x1e 287 288 /* Weak symbols. These are a GNU extension to the a.out format. The 289 semantics are those of ELF weak symbols. Weak symbols are always 290 externally visible. The N_WEAK? values are squeezed into the 291 available slots. The value of a N_WEAKU symbol is 0. The values 292 of the other types are the definitions. */ 293 #define N_WEAKU 0x0d /* Weak undefined symbol. */ 294 #define N_WEAKA 0x0e /* Weak absolute symbol. */ 295 #define N_WEAKT 0x0f /* Weak text symbol. */ 296 #define N_WEAKD 0x10 /* Weak data symbol. */ 297 #define N_WEAKB 0x11 /* Weak bss symbol. */ 298 299 /* This structure describes a single relocation to be performed. 300 The text-relocation section of the file is a vector of these structures, 301 all of which apply to the text section. 302 Likewise, the data-relocation section applies to the data section. */ 303 304 /* The following enum and struct were borrowed from SunOS's 305 /usr/include/sun4/a.out.h and extended to handle 306 other machines. It is currently used on SPARC and AMD 29000. 307 308 reloc_ext_bytes is how it looks on disk. reloc_info_extended is 309 how we might process it on a native host. */ 310 #if USE_EXTENDED_RELOC 311 312 struct reloc_ext_bytes 313 { 314 unsigned char r_address[4]; 315 unsigned char r_index[3]; 316 unsigned char r_bits[1]; 317 unsigned char r_addend[4]; 318 }; 319 320 #define RELOC_EXT_BITS_EXTERN_BIG 0x80 321 #define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 322 323 #define RELOC_EXT_BITS_TYPE_BIG 0x1F 324 #define RELOC_EXT_BITS_TYPE_SH_BIG 0 325 #define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 326 #define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 327 328 #define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */ 329 330 struct reloc_info_extended 331 { 332 unsigned long r_address; 333 unsigned int r_index:24; 334 # define r_symbolnum r_index 335 unsigned r_extern:1; 336 unsigned:2; 337 /* RS/6000 compiler does not support enum bitfield 338 enum reloc_type r_type:5; */ 339 enum reloc_type r_type; 340 long int r_addend; 341 }; 342 343 #else 344 345 /* The standard, old-fashioned, Berkeley compatible relocation struct */ 346 347 #ifdef TC_I860 348 /* NOTE: three bits max, see struct reloc_info_i860.r_type */ 349 enum i860_reloc_type 350 { 351 NO_RELOC = 0, BRADDR, LOW0, LOW1, LOW2, LOW3, LOW4, SPLIT0, SPLIT1, SPLIT2, RELOC_32, 352 }; 353 354 typedef enum i860_reloc_type reloc_type; 355 356 /* NOTE: two bits max, see reloc_info_i860.r_type */ 357 enum highlow_type 358 { 359 NO_SPEC = 0, PAIR, HIGH, HIGHADJ, 360 }; 361 362 struct reloc_info_i860 363 { 364 unsigned long r_address; 365 /* 366 * Using bit fields here is a bad idea because the order is not portable. :-( 367 */ 368 unsigned int r_symbolnum:24; 369 unsigned int r_pcrel:1; 370 unsigned int r_extern:1; 371 /* combining the two field simplifies the argument passing in "new_fix()" */ 372 /* and is compatible with the existing Sparc #ifdef's */ 373 /* r_type: highlow_type - bits 5,4; reloc_type - bits 3-0 */ 374 unsigned int r_type:6; 375 long r_addend; 376 }; 377 378 #endif /* TC_I860 */ 379 380 struct reloc_std_bytes 381 { 382 unsigned char r_address[4]; 383 unsigned char r_index[3]; 384 unsigned char r_bits[1]; 385 }; 386 387 #define RELOC_STD_BITS_PCREL_BIG 0x80 388 #define RELOC_STD_BITS_PCREL_LITTLE 0x01 389 390 #define RELOC_STD_BITS_LENGTH_BIG 0x60 391 #define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ 392 #define RELOC_STD_BITS_LENGTH_LITTLE 0x06 393 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 394 395 #define RELOC_STD_BITS_EXTERN_BIG 0x10 396 #define RELOC_STD_BITS_EXTERN_LITTLE 0x08 397 398 #define RELOC_STD_BITS_BASEREL_BIG 0x08 399 #define RELOC_STD_BITS_BASEREL_LITTLE 0x08 400 401 #define RELOC_STD_BITS_JMPTABLE_BIG 0x04 402 #define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 403 404 #define RELOC_STD_BITS_RELATIVE_BIG 0x02 405 #define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 406 407 #define RELOC_STD_SIZE 8 /* Bytes per relocation entry */ 408 409 #endif /* USE_EXTENDED_RELOC */ 410 411 #ifndef CUSTOM_RELOC_FORMAT 412 struct relocation_info 413 { 414 /* Address (within segment) to be relocated. */ 415 int r_address; 416 /* The meaning of r_symbolnum depends on r_extern. */ 417 unsigned int r_symbolnum:24; 418 /* Nonzero means value is a pc-relative offset 419 and it should be relocated for changes in its own address 420 as well as for changes in the symbol or section specified. */ 421 unsigned int r_pcrel:1; 422 /* Length (as exponent of 2) of the field to be relocated. 423 Thus, a value of 2 indicates 1<<2 bytes. */ 424 unsigned int r_length:2; 425 /* 1 => relocate with value of symbol. 426 r_symbolnum is the index of the symbol 427 in file's the symbol table. 428 0 => relocate with the address of a segment. 429 r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS 430 (the N_EXT bit may be set also, but signifies nothing). */ 431 unsigned int r_extern:1; 432 /* The next three bits are for SunOS shared libraries, and seem to 433 be undocumented. */ 434 #ifdef TC_NS32K 435 unsigned int r_bsr:1; 436 unsigned int r_disp:2; 437 #else 438 unsigned int r_baserel:1; /* Linkage table relative */ 439 unsigned int r_jmptable:1; /* pc-relative to jump table */ 440 unsigned int r_relative:1; /* "relative relocation" */ 441 #endif /* TC_NS32K */ 442 /* unused */ 443 unsigned int r_pad:1; /* Padding -- set to zero */ 444 }; 445 446 #endif /* CUSTOM_RELOC_FORMAT */ 447 448 #endif /* __A_OUT_GNU_H__ */ 449 450 /* end of aout_gnu.h */ 451