sysdeps/generic/a.out.h

   1 #ifndef __A_OUT_GNU_H__
   2 #define __A_OUT_GNU_H__
   3
   4 #ifdef  __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #define __GNU_EXEC_MACROS__
   9
  10 #ifndef __STRUCT_EXEC_OVERRIDE__
  11
  12 struct exec
  13 {
  14   unsigned long a_info;         /* Use macros N_MAGIC, etc for access */
  15   unsigned a_text;              /* size of text, in bytes */
  16   unsigned a_data;              /* size of data, in bytes */
  17   unsigned a_bss;               /* size of uninitialized data area, in bytes */
  18   unsigned a_syms;              /* length of symbol table data, in bytes */
  19   unsigned a_entry;             /* start address */
  20   unsigned a_trsize;            /* size of reloc info for text, in bytes */
  21   unsigned a_drsize;            /* size of reloc info for data, in bytes */
  22
  23 #if defined (sequent) && defined (i386)
  24   struct gdtbl
  25     {                           /* Global Descriptor Table */
  26       unsigned g_code[2];
  27       unsigned g_data[2];
  28       unsigned g_desc[2];
  29     } a_gdtbl;
  30    unsigned a_shdata;           /* size of initialized shared data */
  31    unsigned a_shbss;            /* size of uninitialized shared data */
  32    unsigned a_shdrsize;         /* size of shared data relocation */
  33    unsigned a_bootstrap[11];    /* bootstrap for standalone */
  34    unsigned a_reserved[3];      /* reserved for future use */
  35    unsigned a_version;          /* object version */
  36 #endif /* Sequent Symmetry, Dynix 3.x */
  37 };
  38
  39 #endif /* __STRUCT_EXEC_OVERRIDE__ */
  40
  41 /* these go in the N_MACHTYPE field */
  42 enum machine_type {
  43 #if defined (M_OLDSUN2)
  44   M__OLDSUN2 = M_OLDSUN2,
  45 #else
  46   M_OLDSUN2 = 0,
  47 #endif
  48 #if defined (M_68010)
  49   M__68010 = M_68010,
  50 #else
  51   M_68010 = 1,
  52 #endif
  53 #if defined (M_68020)
  54   M__68020 = M_68020,
  55 #else
  56   M_68020 = 2,
  57 #endif
  58 #if defined (M_SPARC)
  59   M__SPARC = M_SPARC,
  60 #else
  61   M_SPARC = 3,
  62 #endif
  63   /* skip a bunch so we don't run into any of sun's numbers */
  64   M_386 = 100
  65 };
  66
  67 #if defined (sequent) && defined (i386)
  68
  69 /* Dynix 3 wants the magic number to be the whole first longword.  */
  70
  71 #define N_MAGIC(exec)           ((exec).a_info)
  72 #define N_MACHTYPE(exec)        0
  73 #define N_FLAGS(exec)           0
  74 #define N_SET_INFO(exec, magic, type, flags) N_SET_MAGIC ((exec), (magic))
  75 #define N_SET_MAGIC(exec, magic)        ((exec).a_info = (magic))
  76 #define N_SET_MACHTYPE(exec, machtype)  ((void) 0)
  77 #define N_SET_FLAGS(exec, flags)        ((void) 0)
  78 #define OMAGIC          0x12eb  /* impure format - for .o's */
  79 #define ZMAGIC          0x22eb  /* demand load format - zero at zero */
  80 #define NMAGIC          you lose /* syntax error -- no pure format */
  81 #define N_BADMAG(x)     (N_MAGIC(x) != OMAGIC && N_MAGIC(x) != ZMAGIC)
  82 #define N_ADDRADJ(x)    (N_MAGIC(x) == ZMAGIC ? SEGMENT_SIZE : 0)
  83 #define N_DATOFF(x)     (N_TXTOFF(x) + (x).a_text - N_ADDRADJ(x))
  84 #define N_TRELOFF(x)    (N_DATOFF(x) + (x).a_data + (x).a_shdata)
  85 #define N_SYMOFF(x)     (N_DRELOFF(x) + (x).a_drsize + (x).a_shdrsize)
  86 #define N_TXTADDR(x)    SEGMENT_SIZE
  87 #define N_COMM          0x0a    /** conflicts with N_INDR **/
  88 #define N_FN            0x0c
  89 /* Note that the Dynix binutils believe that N_SET[TDB] are
  90    N_SH{DATA,BSS,COMM} -- be wary when mixing GNU & Dynix objects.  */
  91 #define PAGE_SIZE       4096
  92 #define SEGMENT_SIZE    PAGE_SIZE
  93
  94 #else /* !(sequent && i386) */
  95
  96 #if !defined (N_MAGIC)
  97 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
  98 #endif
  99 #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
 100 #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
 101 #define N_SET_INFO(exec, magic, type, flags) \
 102         ((exec).a_info = ((magic) & 0xffff) \
 103          | (((int)(type) & 0xff) << 16) \
 104          | (((flags) & 0xff) << 24))
 105 #define N_SET_MAGIC(exec, magic) \
 106         ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
 107
 108 #define N_SET_MACHTYPE(exec, machtype) \
 109         ((exec).a_info = \
 110          ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
 111
 112 #define N_SET_FLAGS(exec, flags) \
 113         ((exec).a_info = \
 114          ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
 115
 116 #endif  /* sequent && i386 */
 117
 118 #ifndef OMAGIC
 119 /* Code indicating object file or impure executable.  */
 120 #define OMAGIC 0407
 121 /* Code indicating pure executable.  */
 122 #define NMAGIC 0410
 123 /* Code indicating demand-paged executable.  */
 124 #define ZMAGIC 0413
 125 #endif /* not OMAGIC */
 126
 127 #if !defined (N_BADMAG)
 128 #define N_BADMAG(x)                                     \
 129  (N_MAGIC(x) != OMAGIC && N_MAGIC(x) != NMAGIC          \
 130   && N_MAGIC(x) != ZMAGIC)
 131 #endif
 132
 133 #define _N_BADMAG(x)                                    \
 134  (N_MAGIC(x) != OMAGIC && N_MAGIC(x) != NMAGIC          \
 135   && N_MAGIC(x) != ZMAGIC)
 136
 137 #ifndef sparc
 138 #define _N_HDROFF(x) (SEGMENT_SIZE - sizeof (struct exec))
 139 #else
 140 #define _N_HDROFF(x) (- sizeof (struct exec))
 141 #endif
 142
 143 #if !defined (N_TXTOFF)
 144 #define N_TXTOFF(x) \
 145  (N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : sizeof (struct exec))
 146 #endif
 147
 148 #if !defined (N_DATOFF)
 149 #define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
 150 #endif
 151
 152 #if !defined (N_TRELOFF)
 153 #define N_TRELOFF(x) (N_DATOFF(x) + (x).a_data)
 154 #endif
 155
 156 #if !defined (N_DRELOFF)
 157 #define N_DRELOFF(x) (N_TRELOFF(x) + (x).a_trsize)
 158 #endif
 159
 160 #if !defined (N_SYMOFF)
 161 #define N_SYMOFF(x) (N_DRELOFF(x) + (x).a_drsize)
 162 #endif
 163
 164 #if !defined (N_STROFF)
 165 #define N_STROFF(x) (N_SYMOFF(x) + (x).a_syms)
 166 #endif
 167
 168 /* Address of text segment in memory after it is loaded.  */
 169 #if !defined (N_TXTADDR)
 170 #define N_TXTADDR(x) 0
 171 #endif
 172
 173 /* Address of data segment in memory after it is loaded.
 174    Note that it is up to you to define SEGMENT_SIZE
 175    on machines not listed here.  */
 176 #if     defined (hp300) || defined (mips)
 177 #define PAGE_SIZE       4096
 178 #endif
 179 #if     defined (sparc) || defined (NeXT)
 180 #define PAGE_SIZE       0x2000
 181 #endif
 182 #if     defined (sony) || (defined (sun) && defined (mc68000))
 183 #define SEGMENT_SIZE    0x2000
 184 #endif  /* Sony or 68k Sun.  */
 185 #ifdef is68k
 186 #define SEGMENT_SIZE 0x20000
 187 #endif
 188 #if defined(m68k) && defined(PORTAR)
 189 #define PAGE_SIZE 0x400
 190 #endif
 191 #if defined(i386) && !defined(sequent)
 192 /* For COFF encapsulation.  */
 193 #define SEGMENT_SIZE 0x400000
 194 #endif
 195 #ifndef SEGMENT_SIZE
 196 /* This used to be first in this paragraph and under:
 197    if (defined(vax) || defined(hp300) || defined(pyr) || defined(sparc) \
 198      || (defined(m68k) && defined(PORTAR)) \
 199      || defined (NeXT) || defined (mips)) */
 200 #define SEGMENT_SIZE PAGE_SIZE
 201 #endif
 202 #ifndef PAGE_SIZE
 203 /* This value is for i386-minix, but that has no predefine.
 204    Making it default will only cause confusion on machines
 205    which have no proper value defined.  */
 206 #define PAGE_SIZE 16
 207 #endif
 208
 209 #define PAGSIZ  PAGE_SIZE
 210 #define SEGSIZ  SEGMENT_SIZE
 211
 212 #define _N_SEGMENT_ROUND(x) (((x) + SEGMENT_SIZE - 1) & ~(SEGMENT_SIZE - 1))
 213
 214 #define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
 215
 216 #ifndef N_DATADDR
 217 #define N_DATADDR(x) \
 218     (N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
 219      : (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
 220 #endif
 221
 222 /* Address of bss segment in memory after it is loaded.  */
 223 #if !defined (N_BSSADDR)
 224 #define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
 225 #endif
 226 \f
 227 #if !defined (N_NLIST_DECLARED)
 228 struct nlist {
 229   union {
 230     char *n_name;
 231     struct nlist *n_next;
 232     long n_strx;
 233   } n_un;
 234   unsigned char n_type;
 235   char n_other;
 236   short n_desc;
 237   unsigned long n_value;
 238 };
 239 #endif /* no N_NLIST_DECLARED.  */
 240
 241 #if !defined (N_UNDF)
 242 #define N_UNDF 0
 243 #endif
 244 #if !defined (N_ABS)
 245 #define N_ABS 2
 246 #endif
 247 #if !defined (N_TEXT)
 248 #define N_TEXT 4
 249 #endif
 250 #if !defined (N_DATA)
 251 #define N_DATA 6
 252 #endif
 253 #if !defined (N_BSS)
 254 #define N_BSS 8
 255 #endif
 256 #if !defined (N_COMM)
 257 #define N_COMM 18
 258 #endif
 259 #if !defined (N_FN)
 260 #define N_FN 15
 261 #endif
 262
 263 #if !defined (N_EXT)
 264 #define N_EXT 1
 265 #endif
 266 #if !defined (N_TYPE)
 267 #define N_TYPE 036
 268 #endif
 269 #if !defined (N_STAB)
 270 #define N_STAB 0340
 271 #endif
 272
 273 /* The following type indicates the definition of a symbol as being
 274    an indirect reference to another symbol.  The other symbol
 275    appears as an undefined reference, immediately following this symbol.
 276
 277    Indirection is asymmetrical.  The other symbol's value will be used
 278    to satisfy requests for the indirect symbol, but not vice versa.
 279    If the other symbol does not have a definition, libraries will
 280    be searched to find a definition.  */
 281 #define N_INDR 0xa
 282
 283 /* The following symbols refer to set elements.
 284    All the N_SET[ATDB] symbols with the same name form one set.
 285    Space is allocated for the set in the text section, and each set
 286    element's value is stored into one word of the space.
 287    The first word of the space is the length of the set (number of elements).
 288
 289    The address of the set is made into an N_SETV symbol
 290    whose name is the same as the name of the set.
 291    This symbol acts like a N_DATA global symbol
 292    in that it can satisfy undefined external references.  */
 293
 294 /* These appear as input to LD, in a .o file.  */
 295 #define N_SETA  0x14            /* Absolute set element symbol */
 296 #define N_SETT  0x16            /* Text set element symbol */
 297 #define N_SETD  0x18            /* Data set element symbol */
 298 #define N_SETB  0x1A            /* Bss set element symbol */
 299
 300 /* This is output from LD.  */
 301 #define N_SETV  0x1C            /* Pointer to set vector in data area.  */
 302 \f
 303 #if !defined (N_RELOCATION_INFO_DECLARED)
 304 /* This structure describes a single relocation to be performed.
 305    The text-relocation section of the file is a vector of these structures,
 306    all of which apply to the text section.
 307    Likewise, the data-relocation section applies to the data section.  */
 308
 309 struct relocation_info
 310 {
 311   /* Address (within segment) to be relocated.  */
 312   int r_address;
 313   /* The meaning of r_symbolnum depends on r_extern.  */
 314   unsigned int r_symbolnum:24;
 315   /* Nonzero means value is a pc-relative offset
 316      and it should be relocated for changes in its own address
 317      as well as for changes in the symbol or section specified.  */
 318   unsigned int r_pcrel:1;
 319   /* Length (as exponent of 2) of the field to be relocated.
 320      Thus, a value of 2 indicates 1<<2 bytes.  */
 321   unsigned int r_length:2;
 322   /* 1 => relocate with value of symbol.
 323           r_symbolnum is the index of the symbol
 324           in file's the symbol table.
 325      0 => relocate with the address of a segment.
 326           r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
 327           (the N_EXT bit may be set also, but signifies nothing).  */
 328   unsigned int r_extern:1;
 329   /* Four bits that aren't used, but when writing an object file
 330      it is desirable to clear them.  */
 331   unsigned int r_pad:4;
 332 };
 333 #endif /* no N_RELOCATION_INFO_DECLARED.  */
 334
 335 #ifdef  __cplusplus
 336 }
 337 #endif
 338
 339 #endif /* __A_OUT_GNU_H__ */