gas/config/obj-vms.h

   1 /* VMS object file format
   2    Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GAS, the GNU Assembler.
   5
   6 GAS is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as
   8 published by the Free Software Foundation; either version 2,
   9 or (at your option) any later version.
  10
  11 GAS is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  14 the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public
  17 License along with GAS; see the file COPYING.  If not, write
  18 to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 /* Tag to validate a.out object file format processing */
  21 #define OBJ_VMS 1
  22
  23 #include "targ-cpu.h"
  24
  25 /* This macro controls subsection alignment within a section.
  26  *
  27  * Under VAX/VMS, the linker (and PSECT specifications)
  28  * take care of correctly aligning the segments.
  29  * Doing the alignment here (on initialized data) can
  30  * mess up the calculation of global data PSECT sizes.
  31  */
  32 #define SUB_SEGMENT_ALIGN(SEG)  (((SEG) == data_section) ? 0 : 2)
  33
  34 /* This flag is used to remember whether we are in the const or the
  35    data section.  By and large they are identical, but we set a no-write
  36    bit for psects in the const section.  */
  37
  38 extern char const_flag;
  39
  40 /* These are defined in obj-vms.c. */
  41 extern const short seg_N_TYPE[];
  42 extern const segT N_TYPE_seg[];
  43
  44 enum reloc_type
  45   {
  46     NO_RELOC, RELOC_32
  47   };
  48
  49 #define N_BADMAG(x)     (0)
  50 #define N_TXTOFF(x)     ( sizeof(struct exec) )
  51 #define N_DATOFF(x)     ( N_TXTOFF(x) + (x).a_text )
  52 #define N_TROFF(x)      ( N_DATOFF(x) + (x).a_data )
  53 #define N_DROFF(x)      ( N_TROFF(x) + (x).a_trsize )
  54 #define N_SYMOFF(x)     ( N_DROFF(x) + (x).a_drsize )
  55 #define N_STROFF(x)     ( N_SYMOFF(x) + (x).a_syms )
  56
  57 /* We use this copy of the exec header for VMS.  We do not actually use it, but
  58    what we actually do is let gas fill in the relevant slots, and when we get
  59    around to writing an obj file, we just pick out what we need.  */
  60
  61 struct exec
  62 {
  63   unsigned long a_text;         /* length of text, in bytes */
  64   unsigned long a_data;         /* length of data, in bytes */
  65   unsigned long a_bss;          /* length of uninitialized data area for file, in bytes */
  66   unsigned long a_trsize;       /* length of relocation info for text, in bytes */
  67   unsigned long a_drsize;       /* length of relocation info for data, in bytes */
  68   unsigned long a_entry;        /* start address */
  69   unsigned long a_syms;         /* length of symbol table data in file, in bytes */
  70 };
  71
  72 typedef struct
  73   {
  74     struct exec header;         /* a.out header */
  75     long string_table_size;     /* names + '\0' + sizeof(int) */
  76   }
  77
  78 object_headers;
  79
  80 /* A single entry in the symbol table
  81  */
  82 struct nlist
  83   {
  84     union
  85       {
  86         char *n_name;
  87         struct nlist *n_next;
  88         long n_strx;            /* Index into string table      */
  89       }
  90     n_un;
  91     unsigned char n_type;       /* See below                            */
  92     char n_other;               /* Used in i80960 support -- see below  */
  93     short n_desc;
  94     unsigned long n_value;
  95   };
  96
  97 /* Legal values of n_type
  98  */
  99 #define N_UNDF  0               /* Undefined symbol     */
 100 #define N_ABS   2               /* Absolute symbol      */
 101 #define N_TEXT  4               /* Text symbol          */
 102 #define N_DATA  6               /* Data symbol          */
 103 #define N_BSS   8               /* BSS symbol           */
 104 #define N_FN    31              /* Filename symbol      */
 105
 106 #define N_EXT   1               /* External symbol (OR'd in with one of above)  */
 107 #define N_TYPE  036             /* Mask for all the type bits                   */
 108
 109 #define N_STAB  0340            /* Mask for all bits used for SDB entries       */
 110
 111 #define N_GSYM  0x20            /* global symbol: name,,0,type,0 */
 112 #define N_FNAME 0x22            /* procedure name (f77 kludge): name,,0 */
 113 #define N_FUN   0x24            /* procedure: name,,0,linenumber,address */
 114 #define N_STSYM 0x26            /* static symbol: name,,0,type,address */
 115 #define N_LCSYM 0x28            /* .lcomm symbol: name,,0,type,address */
 116 #define N_RSYM  0x40            /* register sym: name,,0,type,register */
 117 #define N_SLINE 0x44            /* src line: 0,,0,linenumber,address */
 118 #define N_CATCH 0x54            /* */
 119 #define N_SSYM  0x60            /* structure elt: name,,0,type,struct_offset */
 120 #define N_SO    0x64            /* source file name: name,,0,0,address */
 121 #define N_LSYM  0x80            /* local sym: name,,0,type,offset */
 122 #define N_SOL   0x84            /* #included file name: name,,0,0,address */
 123 #define N_PSYM  0xa0            /* parameter: name,,0,type,offset */
 124 #define N_ENTRY 0xa4            /* alternate entry: name,linenumber,address */
 125 #define N_LBRAC 0xc0            /* left bracket: 0,,0,nesting level,address */
 126 #define N_RBRAC 0xe0            /* right bracket: 0,,0,nesting level,address */
 127 #define N_BCOMM 0xe2            /* begin common: name,, */
 128 #define N_ECOMM 0xe4            /* end common: name,, */
 129 #define N_ECOML 0xe8            /* end common (local name): ,,address */
 130 #define N_LENG  0xfe            /* second stab entry with length information */
 131
 132 /* SYMBOL TABLE */
 133 /* Symbol table entry data type */
 134
 135 typedef struct nlist obj_symbol_type;   /* Symbol table entry */
 136
 137 /* Symbol table macros and constants */
 138
 139 /*
 140  *  Macros to extract information from a symbol table entry.
 141  *  This syntaxic indirection allows independence regarding a.out or coff.
 142  *  The argument (s) of all these macros is a pointer to a symbol table entry.
 143  */
 144
 145 /* True if the symbol is external */
 146 #define S_IS_EXTERNAL(s)        ((s)->sy_symbol.n_type & N_EXT)
 147
 148 /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
 149 #define S_IS_DEFINED(s)         (S_GET_TYPE(s) != N_UNDF)
 150
 151 #define S_IS_REGISTER(s)        ((s)->sy_symbol.n_type == N_REGISTER)
 152
 153 /* True if a debug special symbol entry */
 154 #define S_IS_DEBUG(s)           ((s)->sy_symbol.n_type & N_STAB)
 155 /* True if a symbol is local symbol name */
 156 /* A symbol name whose name begin with ^A is a gas internal pseudo symbol
 157    nameless symbols come from .stab directives. */
 158 #define S_IS_LOCAL(s)           (S_GET_NAME(s) && \
 159                                  !S_IS_DEBUG(s) && \
 160                                  (S_GET_NAME(s)[0] == '\001' || \
 161                                   (S_LOCAL_NAME(s) && !flagseen['L'])))
 162 /* True if a symbol is not defined in this file */
 163 #define S_IS_EXTERN(s)          ((s)->sy_symbol.n_type & N_EXT)
 164 /* True if the symbol has been generated because of a .stabd directive */
 165 #define S_IS_STABD(s)           (S_GET_NAME(s) == (char *)0)
 166
 167 /* Accessors */
 168 /* The name of the symbol */
 169 #define S_GET_NAME(s)           ((s)->sy_symbol.n_un.n_name)
 170 /* The pointer to the string table */
 171 #define S_GET_OFFSET(s)         ((s)->sy_symbol.n_un.n_strx)
 172 /* The raw type of the symbol */
 173 #define S_GET_RAW_TYPE(s)               ((s)->sy_symbol.n_type)
 174 /* The type of the symbol */
 175 #define S_GET_TYPE(s)           ((s)->sy_symbol.n_type & N_TYPE)
 176 /* The numeric value of the segment */
 177 #define S_GET_SEGMENT(s)        (N_TYPE_seg[S_GET_TYPE(s)])
 178 /* The n_other expression value */
 179 #define S_GET_OTHER(s)          ((s)->sy_symbol.n_other)
 180 /* The n_desc expression value */
 181 #define S_GET_DESC(s)           ((s)->sy_symbol.n_desc)
 182
 183 /* Modifiers */
 184 /* Assume that a symbol cannot be simultaneously in more than on segment */
 185 /* set segment */
 186 #define S_SET_SEGMENT(s,seg)    ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
 187 /* The symbol is external */
 188 #define S_SET_EXTERNAL(s)       ((s)->sy_symbol.n_type |= N_EXT)
 189 /* The symbol is not external */
 190 #define S_CLEAR_EXTERNAL(s)     ((s)->sy_symbol.n_type &= ~N_EXT)
 191 /* Set the name of the symbol */
 192 #define S_SET_NAME(s,v)         ((s)->sy_symbol.n_un.n_name = (v))
 193 /* Set the offset in the string table */
 194 #define S_SET_OFFSET(s,v)       ((s)->sy_symbol.n_un.n_strx = (v))
 195 /* Set the n_other expression value */
 196 #define S_SET_OTHER(s,v)        ((s)->sy_symbol.n_other = (v))
 197 /* Set the n_desc expression value */
 198 #define S_SET_DESC(s,v)         ((s)->sy_symbol.n_desc = (v))
 199
 200
 201 /* File header macro and type definition */
 202
 203 #define H_GET_TEXT_SIZE(h)              ((h)->header.a_text)
 204 #define H_GET_DATA_SIZE(h)              ((h)->header.a_data)
 205 #define H_GET_BSS_SIZE(h)               ((h)->header.a_bss)
 206
 207 #define H_SET_TEXT_SIZE(h,v)            ((h)->header.a_text = md_section_align(SEG_TEXT, (v)))
 208 #define H_SET_DATA_SIZE(h,v)            ((h)->header.a_data = md_section_align(SEG_DATA, (v)))
 209 #define H_SET_BSS_SIZE(h,v)             ((h)->header.a_bss = md_section_align(SEG_BSS, (v)))
 210
 211 #define H_SET_STRING_SIZE(h,v)          ((h)->string_table_size = (v))
 212 #define H_SET_SYMBOL_TABLE_SIZE(h,v)    ((h)->header.a_syms = (v) * \
 213                                          sizeof(struct nlist))
 214
 215 /* line numbering stuff. */
 216 #define OBJ_EMIT_LINENO(a, b, c)        {;}
 217
 218 #define obj_symbol_new_hook(s)  {;}
 219
 220 struct fix;
 221 void tc_aout_fix_to_chars PARAMS ((char *where, struct fix *fixP, relax_addressT segment_address));
 222
 223 extern int vms_resolve_symbol_redef ();
 224 #define RESOLVE_SYMBOL_REDEFINITION(X)  vms_resolve_symbol_redef(X)
 225
 226 /* The rest of this file contains definitions for constants used within the actual
 227    VMS object file.  We do not use a $ in the symbols (as per usual VMS
 228    convention) since System V gags on it.  */
 229
 230 #define OBJ_S_C_HDR     0
 231 #define OBJ_S_C_HDR_MHD 0
 232 #define OBJ_S_C_HDR_LNM 1
 233 #define OBJ_S_C_HDR_SRC 2
 234 #define OBJ_S_C_HDR_TTL 3
 235 #define OBJ_S_C_HDR_CPR 4
 236 #define OBJ_S_C_HDR_MTC 5
 237 #define OBJ_S_C_HDR_GTX 6
 238 #define OBJ_S_C_GSD     1
 239 #define OBJ_S_C_GSD_PSC 0
 240 #define OBJ_S_C_GSD_SYM 1
 241 #define OBJ_S_C_GSD_EPM 2
 242 #define OBJ_S_C_GSD_PRO 3
 243 #define OBJ_S_C_GSD_SYMW        4
 244 #define OBJ_S_C_GSD_EPMW        5
 245 #define OBJ_S_C_GSD_PROW        6
 246 #define OBJ_S_C_GSD_IDC 7
 247 #define OBJ_S_C_GSD_ENV 8
 248 #define OBJ_S_C_GSD_LSY 9
 249 #define OBJ_S_C_GSD_LEPM        10
 250 #define OBJ_S_C_GSD_LPRO        11
 251 #define OBJ_S_C_GSD_SPSC        12
 252 #define OBJ_S_C_TIR     2
 253 #define OBJ_S_C_EOM     3
 254 #define OBJ_S_C_DBG     4
 255 #define OBJ_S_C_TBT     5
 256 #define OBJ_S_C_LNK     6
 257 #define OBJ_S_C_EOMW    7
 258 #define OBJ_S_C_MAXRECTYP       7
 259 #define OBJ_S_K_SUBTYP  1
 260 #define OBJ_S_C_SUBTYP  1
 261 #define OBJ_S_C_MAXRECSIZ       2048
 262 #define OBJ_S_C_STRLVL  0
 263 #define OBJ_S_C_SYMSIZ  31
 264 #define OBJ_S_C_STOREPLIM       -1
 265 #define OBJ_S_C_PSCALILIM       9
 266 \f
 267 #define MHD_S_C_MHD     0
 268 #define MHD_S_C_LNM     1
 269 #define MHD_S_C_SRC     2
 270 #define MHD_S_C_TTL     3
 271 #define MHD_S_C_CPR     4
 272 #define MHD_S_C_MTC     5
 273 #define MHD_S_C_GTX     6
 274 #define MHD_S_C_MAXHDRTYP       6
 275 \f
 276 #define GSD_S_K_ENTRIES 1
 277 #define GSD_S_C_ENTRIES 1
 278 #define GSD_S_C_PSC     0
 279 #define GSD_S_C_SYM     1
 280 #define GSD_S_C_EPM     2
 281 #define GSD_S_C_PRO     3
 282 #define GSD_S_C_SYMW    4
 283 #define GSD_S_C_EPMW    5
 284 #define GSD_S_C_PROW    6
 285 #define GSD_S_C_IDC     7
 286 #define GSD_S_C_ENV     8
 287 #define GSD_S_C_LSY     9
 288 #define GSD_S_C_LEPM    10
 289 #define GSD_S_C_LPRO    11
 290 #define GSD_S_C_SPSC    12
 291 #define GSD_S_C_SYMV    13
 292 #define GSD_S_C_EPMV    14
 293 #define GSD_S_C_PROV    15
 294 #define GSD_S_C_MAXRECTYP       15
 295 \f
 296 #define GSY_S_M_WEAK    1
 297 #define GSY_S_M_DEF     2
 298 #define GSY_S_M_UNI     4
 299 #define GSY_S_M_REL     8
 300 \f
 301 #define GPS_S_M_PIC     1
 302 #define GPS_S_M_LIB     2
 303 #define GPS_S_M_OVR     4
 304 #define GPS_S_M_REL     8
 305 #define GPS_S_M_GBL     16
 306 #define GPS_S_M_SHR     32
 307 #define GPS_S_M_EXE     64
 308 #define GPS_S_M_RD      128
 309 #define GPS_S_M_WRT     256
 310 #define GPS_S_M_VEC     512
 311 #define GPS_S_K_NAME    9
 312 #define GPS_S_C_NAME    9
 313 \f
 314 #define TIR_S_C_STA_GBL 0
 315 #define TIR_S_C_STA_SB  1
 316 #define TIR_S_C_STA_SW  2
 317 #define TIR_S_C_STA_LW  3
 318 #define TIR_S_C_STA_PB  4
 319 #define TIR_S_C_STA_PW  5
 320 #define TIR_S_C_STA_PL  6
 321 #define TIR_S_C_STA_UB  7
 322 #define TIR_S_C_STA_UW  8
 323 #define TIR_S_C_STA_BFI 9
 324 #define TIR_S_C_STA_WFI 10
 325 #define TIR_S_C_STA_LFI 11
 326 #define TIR_S_C_STA_EPM 12
 327 #define TIR_S_C_STA_CKARG       13
 328 #define TIR_S_C_STA_WPB 14
 329 #define TIR_S_C_STA_WPW 15
 330 #define TIR_S_C_STA_WPL 16
 331 #define TIR_S_C_STA_LSY 17
 332 #define TIR_S_C_STA_LIT 18
 333 #define TIR_S_C_STA_LEPM        19
 334 #define TIR_S_C_MAXSTACOD       19
 335 #define TIR_S_C_MINSTOCOD       20
 336 #define TIR_S_C_STO_SB  20
 337 #define TIR_S_C_STO_SW  21
 338 #define TIR_S_C_STO_L   22
 339 #define TIR_S_C_STO_BD  23
 340 #define TIR_S_C_STO_WD  24
 341 #define TIR_S_C_STO_LD  25
 342 #define TIR_S_C_STO_LI  26
 343 #define TIR_S_C_STO_PIDR        27
 344 #define TIR_S_C_STO_PICR        28
 345 #define TIR_S_C_STO_RSB 29
 346 #define TIR_S_C_STO_RSW 30
 347 #define TIR_S_C_STO_RL  31
 348 #define TIR_S_C_STO_VPS 32
 349 #define TIR_S_C_STO_USB 33
 350 #define TIR_S_C_STO_USW 34
 351 #define TIR_S_C_STO_RUB 35
 352 #define TIR_S_C_STO_RUW 36
 353 #define TIR_S_C_STO_B   37
 354 #define TIR_S_C_STO_W   38
 355 #define TIR_S_C_STO_RB  39
 356 #define TIR_S_C_STO_RW  40
 357 #define TIR_S_C_STO_RIVB        41
 358 #define TIR_S_C_STO_PIRR        42
 359 #define TIR_S_C_MAXSTOCOD       42
 360 #define TIR_S_C_MINOPRCOD       50
 361 #define TIR_S_C_OPR_NOP 50
 362 #define TIR_S_C_OPR_ADD 51
 363 #define TIR_S_C_OPR_SUB 52
 364 #define TIR_S_C_OPR_MUL 53
 365 #define TIR_S_C_OPR_DIV 54
 366 #define TIR_S_C_OPR_AND 55
 367 #define TIR_S_C_OPR_IOR 56
 368 #define TIR_S_C_OPR_EOR 57
 369 #define TIR_S_C_OPR_NEG 58
 370 #define TIR_S_C_OPR_COM 59
 371 #define TIR_S_C_OPR_INSV        60
 372 #define TIR_S_C_OPR_ASH 61
 373 #define TIR_S_C_OPR_USH 62
 374 #define TIR_S_C_OPR_ROT 63
 375 #define TIR_S_C_OPR_SEL 64
 376 #define TIR_S_C_OPR_REDEF       65
 377 #define TIR_S_C_OPR_DFLIT       66
 378 #define TIR_S_C_MAXOPRCOD       66
 379 #define TIR_S_C_MINCTLCOD       80
 380 #define TIR_S_C_CTL_SETRB       80
 381 #define TIR_S_C_CTL_AUGRB       81
 382 #define TIR_S_C_CTL_DFLOC       82
 383 #define TIR_S_C_CTL_STLOC       83
 384 #define TIR_S_C_CTL_STKDL       84
 385 #define TIR_S_C_MAXCTLCOD       84
 386 \f
 387 /*
 388  *      Debugger symbol definitions:  These are done by hand, as no
 389  *                                      machine-readable version seems
 390  *                                      to be available.
 391  */
 392 #define DST_S_C_C               7       /* Language == "C"      */
 393 #define DST_S_C_VERSION 153
 394 #define DST_S_C_SOURCE  155     /* Source file          */
 395 #define DST_S_C_PROLOG  162
 396 #define DST_S_C_BLKBEG  176     /* Beginning of block   */
 397 #define DST_S_C_BLKEND  177     /* End of block */
 398 #define DST_S_C_ENTRY   181
 399 #define DST_S_C_PSECT   184
 400 #define DST_S_C_LINE_NUM        185     /* Line Number          */
 401 #define DST_S_C_LBLORLIT        186
 402 #define DST_S_C_LABEL   187
 403 #define DST_S_C_MODBEG  188     /* Beginning of module  */
 404 #define DST_S_C_MODEND  189     /* End of module        */
 405 #define DST_S_C_RTNBEG  190     /* Beginning of routine */
 406 #define DST_S_C_RTNEND  191     /* End of routine       */
 407 #define DST_S_C_DELTA_PC_W      1       /* Incr PC      */
 408 #define DST_S_C_INCR_LINUM      2       /* Incr Line #  */
 409 #define DST_S_C_INCR_LINUM_W    3       /* Incr Line #  */
 410 #define DST_S_C_SET_LINUM_INCR  4
 411 #define DST_S_C_SET_LINUM_INCR_W        5
 412 #define DST_S_C_RESET_LINUM_INCR        6
 413 #define DST_S_C_BEG_STMT_MODE   7
 414 #define DST_S_C_END_STMT_MODE   8
 415 #define DST_S_C_SET_LINE_NUM    9       /* Set Line #   */
 416 #define DST_S_C_SET_PC          10
 417 #define DST_S_C_SET_PC_W                11
 418 #define DST_S_C_SET_PC_L                12
 419 #define DST_S_C_SET_STMTNUM     13
 420 #define DST_S_C_TERM            14      /* End of lines */
 421 #define DST_S_C_TERM_W          15      /* End of lines */
 422 #define DST_S_C_SET_ABS_PC      16      /* Set PC       */
 423 #define DST_S_C_DELTA_PC_L      17      /* Incr PC      */
 424 #define DST_S_C_INCR_LINUM_L    18      /* Incr Line #  */
 425 #define DST_S_C_SET_LINUM_B     19      /* Set Line #   */
 426 #define DST_S_C_SET_LINUM_L     20      /* Set Line #   */
 427 #define DST_S_C_TERM_L          21      /* End of lines */
 428 /* these are used with DST_S_C_SOURCE */
 429 #define DST_S_C_SRC_FORMFEED    16      /* ^L counts    */
 430 #define DST_S_C_SRC_DECLFILE    1       /* Declare file */
 431 #define DST_S_C_SRC_SETFILE     2       /* Set file     */
 432 #define DST_S_C_SRC_SETREC_L    3       /* Set record   */
 433 #define DST_S_C_SRC_DEFLINES_W  10      /* # of line    */
 434 /* the following are the codes for the various data types.  Anything not on
 435  * the list is included under 'advanced_type'
 436  */
 437 #define DBG_S_C_UCHAR           0x02
 438 #define DBG_S_C_USINT           0x03
 439 #define DBG_S_C_ULINT           0x04
 440 #define DBG_S_C_SCHAR           0x06
 441 #define DBG_S_C_SSINT           0x07
 442 #define DBG_S_C_SLINT           0x08
 443 #define DBG_S_C_REAL4           0x0a
 444 #define DBG_S_C_REAL8           0x0b
 445 #define DBG_S_C_FUNCTION_ADDR   0x17
 446 #define DBG_S_C_ADVANCED_TYPE   0xa3
 447 /*  These are the codes that are used to generate the definitions of struct
 448  *  union and enum records
 449  */
 450 #define DBG_S_C_ENUM_ITEM                       0xa4
 451 #define DBG_S_C_ENUM_START              0xa5
 452 #define DBG_S_C_ENUM_END                        0xa6
 453 #define DBG_S_C_STRUCT_START            0xab
 454 #define DBG_S_C_STRUCT_ITEM             0xff
 455 #define DBG_S_C_STRUCT_END              0xac
 456 /*  These are the codes that are used in the suffix records to determine the
 457  *  actual data type
 458  */
 459 #define DBG_S_C_BASIC                   0x01
 460 #define DBG_S_C_BASIC_ARRAY             0x02
 461 #define DBG_S_C_STRUCT                  0x03
 462 #define DBG_S_C_POINTER                 0x04
 463 #define DBG_S_C_VOID                    0x05
 464 #define DBG_S_C_COMPLEX_ARRAY           0x07
 465 /* These codes are used in the generation of the symbol definition records
 466  */
 467 #define DBG_S_C_FUNCTION_PARAMETER      0xc9
 468 #define DBG_S_C_LOCAL_SYM                       0xd9
 469 /* end of obj-vms.h */