include/coff/a29k.h

   1 /* COFF spec for AMD 290*0
   2    Contributed by David Wood @ New York University.
   3  */
   4
   5 #ifndef AMD
   6 # define AMD
   7 #endif
   8
   9 /****************************************************************/
  10
  11 /*
  12 ** File Header and related definitions
  13 */
  14
  15 struct external_filehdr
  16 {
  17         char f_magic[2];        /* magic number          */
  18         char f_nscns[2];        /* number of sections      */
  19         char f_timdat[4];       /* time & date stamp        */
  20         char f_symptr[4];       /* file pointer to symtab       */
  21         char f_nsyms[4];        /* number of symtab entries     */
  22         char f_opthdr[2];       /* sizeof(optional hdr)  */
  23         char f_flags[2];        /* flags                        */
  24 };
  25
  26 #define FILHDR  struct external_filehdr
  27 #define FILHSZ  sizeof (FILHDR)
  28
  29 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
  30
  31 /*
  32 ** Magic numbers for Am29000
  33 **      (AT&T will assign the "real" magic number)
  34 */
  35
  36 #define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB) */
  37 #define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB) */
  38
  39
  40 #define A29K_MAGIC_BIG          SIPFBOMAGIC
  41 #define A29K_MAGIC_LITTLE       SIPRBOMAGIC
  42 #define A29KBADMAG(x)   (((x).f_magic!=A29K_MAGIC_BIG) && \
  43                           ((x).f_magic!=A29K_MAGIC_LITTLE))
  44
  45 #define OMAGIC A29K_MAGIC_BIG
  46 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
  47
  48 /*
  49 ** File header flags currently known to us.
  50 **
  51 ** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
  52 ** the byte ordering in the file.
  53 */
  54
  55 /*--------------------------------------------------------------*/
  56
  57 /*
  58 ** Optional (a.out) header
  59 */
  60
  61 typedef struct external_aouthdr
  62 {
  63   char  magic[2];              /* type of file                   */
  64   char  vstamp[2];            /* version stamp                  */
  65   char  tsize[4];              /* text size in bytes, padded to FW bdry*/
  66   char  dsize[4];              /* initialized data "  "         */
  67   char  bsize[4];              /* uninitialized data "   "           */
  68   char  entry[4];              /* entry pt.                         */
  69   char  text_start[4];    /* base of text used for this file */
  70   char  data_start[4];    /* base of data used for this file */
  71 } AOUTHDR;
  72
  73 #define AOUTSZ (sizeof(AOUTHDR))
  74 #define AOUTHDRSZ (sizeof(AOUTHDR))
  75
  76 /* aouthdr magic numbers */
  77 #define NMAGIC          0410    /* separate i/d executable */
  78 #define SHMAGIC 0406            /* NYU/Ultra3 shared data executable
  79                                    (writable text) */
  80
  81 #define _ETEXT          "_etext"
  82
  83 /*--------------------------------------------------------------*/
  84
  85 /*
  86 ** Section header and related definitions
  87 */
  88
  89 struct external_scnhdr
  90 {
  91         char        s_name[8];      /* section name              */
  92         char        s_paddr[4];     /* physical address, aliased s_nlib */
  93         char        s_vaddr[4];     /* virtual address        */
  94         char        s_size[4];      /* section size              */
  95         char        s_scnptr[4];    /* file ptr to raw data for section */
  96         char        s_relptr[4];    /* file ptr to relocation       */
  97         char        s_lnnoptr[4];   /* file ptr to line numbers     */
  98         char        s_nreloc[2];    /* number of relocation entries */
  99         char        s_nlnno[2];     /* number of line number entries*/
 100         char        s_flags[4];     /* flags                    */
 101 };
 102
 103 #define SCNHDR  struct  external_scnhdr
 104 #define SCNHSZ  sizeof  (SCNHDR)
 105
 106 /*
 107  * names of "special" sections
 108  */
 109 #define _TEXT   ".text"
 110 #define _DATA   ".data"
 111 #define _BSS    ".bss"
 112 #define _LIT    ".lit"
 113
 114 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 115
 116 /*
 117 ** Section types - with additional section type for global
 118 ** registers which will be relocatable for the Am29000.
 119 **
 120 ** In instances where it is necessary for a linker to produce an
 121 ** output file which contains text or data not based at virtual
 122 ** address 0, e.g. for a ROM, then the linker should accept
 123 ** address base information as command input and use PAD sections
 124 ** to skip over unused addresses.
 125 */
 126
 127 #define STYP_BSSREG     0x1200  /* Global register area (like STYP_INFO) */
 128 #define STYP_ENVIR      0x2200  /* Environment (like STYP_INFO) */
 129 #define STYP_ABS        0x4000  /* Absolute (allocated, not reloc, loaded) */
 130
 131 /*--------------------------------------------------------------*/
 132
 133 /*
 134 ** Relocation information declaration and related definitions
 135 */
 136
 137 struct external_reloc {
 138   char r_vaddr[4];      /* (virtual) address of reference */
 139   char r_symndx[4];     /* index into symbol table */
 140   char r_type[2];       /* relocation type */
 141 };
 142
 143 #define RELOC           struct external_reloc
 144 #define RELSZ           10              /* sizeof (RELOC) */
 145
 146 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 147
 148 /*
 149 ** Relocation types for the Am29000
 150 */
 151
 152 #define R_ABS           0       /* reference is absolute */
 153
 154 #define R_IREL          030     /* instruction relative (jmp/call) */
 155 #define R_IABS          031     /* instruction absolute (jmp/call) */
 156 #define R_ILOHALF       032     /* instruction low half  (const)  */
 157 #define R_IHIHALF       033     /* instruction high half (consth) part 1 */
 158 #define R_IHCONST       034     /* instruction high half (consth) part 2 */
 159                                 /* constant offset of R_IHIHALF relocation */
 160 #define R_BYTE          035     /* relocatable byte value */
 161 #define R_HWORD         036     /* relocatable halfword value */
 162 #define R_WORD          037     /* relocatable word value */
 163
 164 #define R_IGLBLRC       040     /* instruction global register RC */
 165 #define R_IGLBLRA       041     /* instruction global register RA */
 166 #define R_IGLBLRB       042     /* instruction global register RB */
 167
 168 /*
 169 NOTE:
 170 All the "I" forms refer to 29000 instruction formats.  The linker is
 171 expected to know how the numeric information is split and/or aligned
 172 within the instruction word(s).  R_BYTE works for instructions, too.
 173
 174 If the parameter to a CONSTH instruction is a relocatable type, two
 175 relocation records are written.  The first has an r_type of R_IHIHALF
 176 (33 octal) and a normal r_vaddr and r_symndx.  The second relocation
 177 record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
 178 is redundant), and an r_symndx containing the 32-bit constant offset
 179 to the relocation instead of the actual symbol table index.  This
 180 second record is always written, even if the constant offset is zero.
 181 The constant fields of the instruction are set to zero.
 182 */
 183
 184 /*--------------------------------------------------------------*/
 185
 186 /*
 187 ** Line number entry declaration and related definitions
 188 */
 189
 190 struct external_lineno
 191 {
 192    union {
 193          char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
 194          char l_paddr[4];  /* (physical) address of line number    */
 195    } l_addr;
 196    char l_lnno[2];      /* line number    */
 197 };
 198
 199 #define LINENO          struct external_lineno
 200 #define LINESZ          6               /* sizeof (LINENO) */
 201
 202 /*--------------------------------------------------------------*/
 203
 204 /*
 205 ** Symbol entry declaration and related definitions
 206 */
 207
 208 #define E_SYMNMLEN      8       /* Number of characters in a symbol name */
 209
 210 struct external_syment
 211 {
 212   union {
 213     char e_name[E_SYMNMLEN];
 214     struct {
 215       char e_zeroes[4];
 216       char e_offset[4];
 217     } e;
 218   } e;
 219   char e_value[4];
 220   char e_scnum[2];
 221   char e_type[2];
 222   char e_sclass[1];
 223   char e_numaux[1];
 224 };
 225
 226 #define SYMENT  struct external_syment
 227 #define SYMESZ  sizeof(SYMENT)
 228
 229 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 230
 231 /*
 232 ** Storage class definitions - new classes for global registers.
 233 */
 234
 235 #define C_GLBLREG       19              /* global register */
 236 #define C_EXTREG        20              /* external global register */
 237 #define C_DEFREG        21              /* ext. def. of global register */
 238
 239
 240 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 241
 242 /*
 243 ** Derived symbol mask/shifts.
 244 */
 245
 246 #define N_BTMASK        (0xf)
 247 #define N_BTSHFT        (4)
 248 #define N_TMASK         (0x30)
 249 #define N_TSHIFT        (2)
 250
 251 /*--------------------------------------------------------------*/
 252
 253 /*
 254 ** Auxiliary symbol table entry declaration and related
 255 ** definitions.
 256 */
 257
 258 #define E_FILNMLEN      14      /* # characters in a file name    */
 259 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 260
 261 union external_auxent {
 262         struct {
 263                 char x_tagndx[4];       /* str, un, or enum tag indx */
 264                 union {
 265                         struct {
 266                             char  x_lnno[2]; /* declaration line number */
 267                             char  x_size[2]; /* str/union/array size */
 268                         } x_lnsz;
 269                         char x_fsize[4];        /* size of function */
 270                 } x_misc;
 271                 union {
 272                         struct {                /* if ISFCN, tag, or .bb */
 273                             char x_lnnoptr[4];  /* ptr to fcn line # */
 274                             char x_endndx[4];   /* entry ndx past block end */
 275                         } x_fcn;
 276                         struct {                /* if ISARY, up to 4 dimen. */
 277                             char x_dimen[E_DIMNUM][2];
 278                         } x_ary;
 279                 } x_fcnary;
 280                 char x_tvndx[2];                /* tv index */
 281         } x_sym;
 282
 283         union {
 284                 char x_fname[E_FILNMLEN];
 285                 struct {
 286                         char x_zeroes[4];
 287                         char x_offset[4];
 288                 } x_n;
 289         } x_file;
 290
 291         struct {
 292                 char x_scnlen[4];                      /* section length */
 293                 char x_nreloc[2];       /* # relocation entries */
 294                 char x_nlinno[2];       /* # line numbers */
 295         } x_scn;
 296
 297         struct {
 298                 char x_tvfill[4];       /* tv fill value */
 299                 char x_tvlen[2];        /* length of .tv */
 300                 char x_tvran[2][2];     /* tv range */
 301         } x_tv;  /* info about .tv section (in auxent of symbol .tv)) */
 302 };
 303
 304 #define AUXENT          union external_auxent
 305 #define AUXESZ          18