Annotation of src/external/gpl3/binutils.old/dist/gas/config/aout_gnu.h, Revision 1.1
1.1 ! christos 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)
! 39: enum 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:
! 76: struct 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:
! 93: struct 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
! 113: enum 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:
! 222: struct 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:
! 313: struct 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:
! 331: struct 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 */
! 350: enum i860_reloc_type
! 351: {
! 352: NO_RELOC = 0, BRADDR, LOW0, LOW1, LOW2, LOW3, LOW4, SPLIT0, SPLIT1, SPLIT2, RELOC_32,
! 353: };
! 354:
! 355: typedef enum i860_reloc_type reloc_type;
! 356:
! 357: /* NOTE: two bits max, see reloc_info_i860.r_type */
! 358: enum highlow_type
! 359: {
! 360: NO_SPEC = 0, PAIR, HIGH, HIGHADJ,
! 361: };
! 362:
! 363: struct 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:
! 381: struct 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
! 413: struct 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 */
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