| 1 | /* This file is aout_gnu.h |
| 2 | |
| 3 | Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 2000, 2002 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to |
| 20 | the Free Software Foundation, 51 Franklin Street - Fifth Floor, 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(exec) ((exec).a_info & 0xffff) |
| 130 | #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff)) |
| 131 | #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff) |
| 132 | #define N_SET_INFO(exec, magic, type, flags) \ |
| 133 | ((exec).a_info = ((magic) & 0xffff) \ |
| 134 | | (((int)(type) & 0xff) << 16) \ |
| 135 | | (((flags) & 0xff) << 24)) |
| 136 | #define N_SET_MAGIC(exec, magic) \ |
| 137 | ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff))) |
| 138 | |
| 139 | #define N_SET_MACHTYPE(exec, machtype) \ |
| 140 | ((exec).a_info = \ |
| 141 | ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16)) |
| 142 | |
| 143 | #define N_SET_FLAGS(exec, flags) \ |
| 144 | ((exec).a_info = \ |
| 145 | ((exec).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 | \f |
| 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 | \f |
| 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 */ |