1/* This file is aout_gnu.h 2 3 Copyright 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 2000, 2002, 4 2005, 2007 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 3, 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, 21 Boston, MA 02110-1301, USA. */ 22 23#ifndef __A_OUT_GNU_H__ 24#define __A_OUT_GNU_H__ 25 26/* There are two main flavours of a.out, one which uses the standard 27 relocations, and one which uses extended relocations. 28 29 Today, the extended reloc uses are 30 TC_SPARC 31 32 each must define the enum reloc_type 33 34*/ 35 36#define USE_EXTENDED_RELOC defined(TC_SPARC) 37 38#if defined(TC_SPARC) 39enum reloc_type 40 { 41 RELOC_8, RELOC_16, RELOC_32,/* simple relocations */ 42 RELOC_DISP8, RELOC_DISP16, RELOC_DISP32, /* pc-rel displacement */ 43 RELOC_WDISP30, RELOC_WDISP22, 44 RELOC_HI22, RELOC_22, 45 RELOC_13, RELOC_LO10, 46 RELOC_SFA_BASE, RELOC_SFA_OFF13, 47 RELOC_BASE10, RELOC_BASE13, RELOC_BASE22, /* P.I.C. (base-relative) */ 48 RELOC_PC10, RELOC_PC22, /* for some sort of pc-rel P.I.C. (?) */ 49 RELOC_JMP_TBL, /* P.I.C. jump table */ 50 RELOC_SEGOFF16, /* reputedly for shared libraries somehow */ 51 RELOC_GLOB_DAT, RELOC_JMP_SLOT, RELOC_RELATIVE, 52 RELOC_10, RELOC_11, 53 RELOC_WDISP2_14, 54 RELOC_WDISP19, 55 RELOC_HHI22, 56 RELOC_HLO10, 57 58 /* 29K relocation types */ 59 RELOC_JUMPTARG, RELOC_CONST, RELOC_CONSTH, 60 61 RELOC_WDISP14, RELOC_WDISP21, 62 63 NO_RELOC 64 }; 65 66#endif /* TC_SPARC */ 67 68#define __GNU_EXEC_MACROS__ 69 70#ifndef __STRUCT_EXEC_OVERRIDE__ 71 72/* This is the layout on disk of a Unix V7, Berkeley, SunOS, Vax Ultrix 73 "struct exec". Don't assume that on this machine, the "struct exec" 74 will lay out the same sizes or alignments. */ 75 76struct exec_bytes 77 { 78 unsigned char a_info[4]; 79 unsigned char a_text[4]; 80 unsigned char a_data[4]; 81 unsigned char a_bss[4]; 82 unsigned char a_syms[4]; 83 unsigned char a_entry[4]; 84 unsigned char a_trsize[4]; 85 unsigned char a_drsize[4]; 86 }; 87 88/* How big the "struct exec" is on disk */ 89#define EXEC_BYTES_SIZE (8 * 4) 90 91/* This is the layout in memory of a "struct exec" while we process it. */ 92 93struct exec 94{ 95 unsigned long a_info; /* Use macros N_MAGIC, etc for access */ 96 unsigned a_text; /* length of text, in bytes */ 97 unsigned a_data; /* length of data, in bytes */ 98 unsigned a_bss; /* length of uninitialized data area for file, in bytes */ 99 unsigned a_syms; /* length of symbol table data in file, in bytes */ 100 unsigned a_entry; /* start address */ 101 unsigned a_trsize; /* length of relocation info for text, in bytes */ 102 unsigned a_drsize; /* length of relocation info for data, in bytes */ 103}; 104 105#endif /* __STRUCT_EXEC_OVERRIDE__ */ 106 107/* these go in the N_MACHTYPE field */ 108/* These symbols could be defined by code from Suns...punt 'em */ 109#undef M_UNKNOWN 110#undef M_68010 111#undef M_68020 112#undef M_SPARC 113enum machine_type 114 { 115 M_UNKNOWN = 0, 116 M_68010 = 1, 117 M_68020 = 2, 118 M_SPARC = 3, 119 /* skip a bunch so we don't run into any of sun's numbers */ 120 M_386 = 100, 121 M_29K = 101, 122 M_RS6000 = 102, /* IBM RS/6000 */ 123 M_VAX4K_NETBSD = 150, 124 /* HP/BSD formats */ 125 M_HP200 = 200, /* hp200 (68010) BSD binary */ 126 M_HP300 = 300, /* hp300 (68020+68881) BSD binary */ 127 M_HPUX23 = 0x020C /* hp200/300 HPUX binary */ 128 }; 129 130#define N_MAGIC(exec) ((exec).a_info & 0xffff) 131#define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff)) 132#define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff) 133#define N_SET_INFO(exec, magic, type, flags) \ 134 ((exec).a_info = ((magic) & 0xffff) \ 135 | (((int)(type) & 0xff) << 16) \ 136 | (((flags) & 0xff) << 24)) 137#define N_SET_MAGIC(exec, magic) \ 138 ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff))) 139 140#define N_SET_MACHTYPE(exec, machtype) \ 141 ((exec).a_info = \ 142 ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16)) 143 144#define N_SET_FLAGS(exec, flags) \ 145 ((exec).a_info = \ 146 ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24)) 147 148/* Code indicating object file or impure executable. */ 149#ifndef OMAGIC 150#define OMAGIC 0407 151#endif 152/* Code indicating pure executable. */ 153#define NMAGIC 0410 154/* Code indicating demand-paged executable. */ 155#define ZMAGIC 0413 156 157/* Virtual Address of text segment from the a.out file. For OMAGIC, 158 (almost always "unlinked .o's" these days), should be zero. 159 For linked files, should reflect reality if we know it. */ 160 161#ifndef N_TXTADDR 162#define N_TXTADDR(x) (N_MAGIC(x)==OMAGIC? 0 : TEXT_START_ADDR) 163#endif 164 165#ifndef N_BADMAG 166#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \ 167 && N_MAGIC(x) != NMAGIC \ 168 && N_MAGIC(x) != ZMAGIC) 169#endif 170 171/* By default, segment size is constant. But on some machines, it can 172 be a function of the a.out header (e.g. machine type). */ 173#ifndef N_SEGSIZE 174#define N_SEGSIZE(x) SEGMENT_SIZE 175#endif 176 177/* This complexity is for encapsulated COFF support */ 178#ifndef _N_HDROFF 179#define _N_HDROFF(x) (N_SEGSIZE(x) - sizeof (struct exec)) 180#endif 181 182#ifndef N_TXTOFF 183#define N_TXTOFF(x) (N_MAGIC(x) == ZMAGIC ? \ 184 _N_HDROFF((x)) + sizeof (struct exec) : \ 185 sizeof (struct exec)) 186#endif 187 188#ifndef N_DATOFF 189#define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text ) 190#endif 191 192#ifndef N_TRELOFF 193#define N_TRELOFF(x) ( N_DATOFF(x) + (x).a_data ) 194#endif 195 196#ifndef N_DRELOFF 197#define N_DRELOFF(x) ( N_TRELOFF(x) + (x).a_trsize ) 198#endif 199 200#ifndef N_SYMOFF 201#define N_SYMOFF(x) ( N_DRELOFF(x) + (x).a_drsize ) 202#endif 203 204#ifndef N_STROFF 205#define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms ) 206#endif 207 208/* Address of text segment in memory after it is loaded. */ 209#ifndef N_TXTADDR 210#define N_TXTADDR(x) 0 211#endif 212 213#ifndef N_DATADDR 214#define N_DATADDR(x) \ 215 (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \ 216 : (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1)))) 217#endif 218 219/* Address of bss segment in memory after it is loaded. */ 220#define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data) 221 222struct nlist 223 { 224 union 225 { 226 char *n_name; 227 struct nlist *n_next; 228 long n_strx; 229 } 230 n_un; 231 unsigned char n_type; 232 char n_other; 233 short n_desc; 234 unsigned long n_value; 235 }; 236 237#define N_UNDF 0 238#define N_ABS 2 239#define N_TEXT 4 240#define N_DATA 6 241#define N_BSS 8 242#define N_COMM 0x12 /* common (visible in shared lib commons) */ 243#define N_FN 0x1F /* File name of a .o file */ 244 245/* Note: N_EXT can only usefully be OR-ed with N_UNDF, N_ABS, N_TEXT, 246 N_DATA, or N_BSS. When the low-order bit of other types is set, 247 (e.g. N_WARNING versus N_FN), they are two different types. */ 248#define N_EXT 1 249#define N_TYPE 036 250#define N_STAB 0340 251 252/* The following type indicates the definition of a symbol as being 253 an indirect reference to another symbol. The other symbol 254 appears as an undefined reference, immediately following this symbol. 255 256 Indirection is asymmetrical. The other symbol's value will be used 257 to satisfy requests for the indirect symbol, but not vice versa. 258 If the other symbol does not have a definition, libraries will 259 be searched to find a definition. */ 260 261#define N_INDR 0xa 262 263/* The following symbols refer to set elements. 264 All the N_SET[ATDB] symbols with the same name form one set. 265 Space is allocated for the set in the text section, and each set 266 element's value is stored into one word of the space. 267 The first word of the space is the length of the set (number of elements). 268 269 The address of the set is made into an N_SETV symbol 270 whose name is the same as the name of the set. 271 This symbol acts like a N_DATA global symbol 272 in that it can satisfy undefined external references. */ 273 274/* These appear as input to LD, in a .o file. */ 275#define N_SETA 0x14 /* Absolute set element symbol */ 276#define N_SETT 0x16 /* Text set element symbol */ 277#define N_SETD 0x18 /* Data set element symbol */ 278#define N_SETB 0x1A /* Bss set element symbol */ 279 280/* This is output from LD. */ 281#define N_SETV 0x1C /* Pointer to set vector in data area. */ 282 283/* Warning symbol. The text gives a warning message, the next symbol 284 in the table will be undefined. When the symbol is referenced, the 285 message is printed. */ 286 287#define N_WARNING 0x1e 288 289/* Weak symbols. These are a GNU extension to the a.out format. The 290 semantics are those of ELF weak symbols. Weak symbols are always 291 externally visible. The N_WEAK? values are squeezed into the 292 available slots. The value of a N_WEAKU symbol is 0. The values 293 of the other types are the definitions. */ 294#define N_WEAKU 0x0d /* Weak undefined symbol. */ 295#define N_WEAKA 0x0e /* Weak absolute symbol. */ 296#define N_WEAKT 0x0f /* Weak text symbol. */ 297#define N_WEAKD 0x10 /* Weak data symbol. */ 298#define N_WEAKB 0x11 /* Weak bss symbol. */ 299 300/* This structure describes a single relocation to be performed. 301 The text-relocation section of the file is a vector of these structures, 302 all of which apply to the text section. 303 Likewise, the data-relocation section applies to the data section. */ 304 305/* The following enum and struct were borrowed from SunOS's 306 /usr/include/sun4/a.out.h and extended to handle 307 other machines. It is currently used on SPARC and AMD 29000. 308 309 reloc_ext_bytes is how it looks on disk. reloc_info_extended is 310 how we might process it on a native host. */ 311#if USE_EXTENDED_RELOC 312 313struct reloc_ext_bytes 314 { 315 unsigned char r_address[4]; 316 unsigned char r_index[3]; 317 unsigned char r_bits[1]; 318 unsigned char r_addend[4]; 319 }; 320 321#define RELOC_EXT_BITS_EXTERN_BIG 0x80 322#define RELOC_EXT_BITS_EXTERN_LITTLE 0x01 323 324#define RELOC_EXT_BITS_TYPE_BIG 0x1F 325#define RELOC_EXT_BITS_TYPE_SH_BIG 0 326#define RELOC_EXT_BITS_TYPE_LITTLE 0xF8 327#define RELOC_EXT_BITS_TYPE_SH_LITTLE 3 328 329#define RELOC_EXT_SIZE 12 /* Bytes per relocation entry */ 330 331struct reloc_info_extended 332{ 333 unsigned long r_address; 334 unsigned int r_index:24; 335# define r_symbolnum r_index 336 unsigned r_extern:1; 337 unsigned:2; 338 /* RS/6000 compiler does not support enum bitfield 339 enum reloc_type r_type:5; */ 340 enum reloc_type r_type; 341 long int r_addend; 342}; 343 344#else 345 346/* The standard, old-fashioned, Berkeley compatible relocation struct */ 347 348#ifdef TC_I860 349/* NOTE: three bits max, see struct reloc_info_i860.r_type */ 350enum i860_reloc_type 351 { 352 NO_RELOC = 0, BRADDR, LOW0, LOW1, LOW2, LOW3, LOW4, SPLIT0, SPLIT1, SPLIT2, RELOC_32, 353 }; 354 355typedef enum i860_reloc_type reloc_type; 356 357/* NOTE: two bits max, see reloc_info_i860.r_type */ 358enum highlow_type 359 { 360 NO_SPEC = 0, PAIR, HIGH, HIGHADJ, 361 }; 362 363struct reloc_info_i860 364{ 365 unsigned long r_address; 366 /* 367 * Using bit fields here is a bad idea because the order is not portable. :-( 368 */ 369 unsigned int r_symbolnum:24; 370 unsigned int r_pcrel:1; 371 unsigned int r_extern:1; 372 /* combining the two field simplifies the argument passing in "new_fix()" */ 373 /* and is compatible with the existing Sparc #ifdef's */ 374 /* r_type: highlow_type - bits 5,4; reloc_type - bits 3-0 */ 375 unsigned int r_type:6; 376 long r_addend; 377}; 378 379#endif /* TC_I860 */ 380 381struct reloc_std_bytes 382 { 383 unsigned char r_address[4]; 384 unsigned char r_index[3]; 385 unsigned char r_bits[1]; 386 }; 387 388#define RELOC_STD_BITS_PCREL_BIG 0x80 389#define RELOC_STD_BITS_PCREL_LITTLE 0x01 390 391#define RELOC_STD_BITS_LENGTH_BIG 0x60 392#define RELOC_STD_BITS_LENGTH_SH_BIG 5 /* To shift to units place */ 393#define RELOC_STD_BITS_LENGTH_LITTLE 0x06 394#define RELOC_STD_BITS_LENGTH_SH_LITTLE 1 395 396#define RELOC_STD_BITS_EXTERN_BIG 0x10 397#define RELOC_STD_BITS_EXTERN_LITTLE 0x08 398 399#define RELOC_STD_BITS_BASEREL_BIG 0x08 400#define RELOC_STD_BITS_BASEREL_LITTLE 0x08 401 402#define RELOC_STD_BITS_JMPTABLE_BIG 0x04 403#define RELOC_STD_BITS_JMPTABLE_LITTLE 0x04 404 405#define RELOC_STD_BITS_RELATIVE_BIG 0x02 406#define RELOC_STD_BITS_RELATIVE_LITTLE 0x02 407 408#define RELOC_STD_SIZE 8 /* Bytes per relocation entry */ 409 410#endif /* USE_EXTENDED_RELOC */ 411 412#ifndef CUSTOM_RELOC_FORMAT 413struct relocation_info 414{ 415 /* Address (within segment) to be relocated. */ 416 int r_address; 417 /* The meaning of r_symbolnum depends on r_extern. */ 418 unsigned int r_symbolnum:24; 419 /* Nonzero means value is a pc-relative offset 420 and it should be relocated for changes in its own address 421 as well as for changes in the symbol or section specified. */ 422 unsigned int r_pcrel:1; 423 /* Length (as exponent of 2) of the field to be relocated. 424 Thus, a value of 2 indicates 1<<2 bytes. */ 425 unsigned int r_length:2; 426 /* 1 => relocate with value of symbol. 427 r_symbolnum is the index of the symbol 428 in file's the symbol table. 429 0 => relocate with the address of a segment. 430 r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS 431 (the N_EXT bit may be set also, but signifies nothing). */ 432 unsigned int r_extern:1; 433 /* The next three bits are for SunOS shared libraries, and seem to 434 be undocumented. */ 435#ifdef TC_NS32K 436 unsigned int r_bsr:1; 437 unsigned int r_disp:2; 438#else 439 unsigned int r_baserel:1; /* Linkage table relative */ 440 unsigned int r_jmptable:1; /* pc-relative to jump table */ 441 unsigned int r_relative:1; /* "relative relocation" */ 442#endif /* TC_NS32K */ 443 /* unused */ 444 unsigned int r_pad:1; /* Padding -- set to zero */ 445}; 446 447#endif /* CUSTOM_RELOC_FORMAT */ 448 449#endif /* __A_OUT_GNU_H__ */ 450 451/* end of aout_gnu.h */ 452