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
 113 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 114
 115 /*
 116 ** Section types - with additional section type for global
 117 ** registers which will be relocatable for the Am29000.
 118 **
 119 ** In instances where it is necessary for a linker to produce an
 120 ** output file which contains text or data not based at virtual
 121 ** address 0, e.g. for a ROM, then the linker should accept
 122 ** address base information as command input and use PAD sections
 123 ** to skip over unused addresses.
 124 */
 125
 126 #define STYP_BSSREG     0x1200  /* Global register area (like STYP_INFO) */
 127 #define STYP_ENVIR      0x2200  /* Environment (like STYP_INFO) */
 128 #define STYP_ABS        0x4000  /* Absolute (allocated, not reloc, loaded) */
 129
 130 /*--------------------------------------------------------------*/
 131
 132 /*
 133 ** Relocation information declaration and related definitions
 134 */
 135
 136 struct external_reloc {
 137   char r_vaddr[4];      /* (virtual) address of reference */
 138   char r_symndx[4];     /* index into symbol table */
 139   char r_type[2];       /* relocation type */
 140 };
 141
 142 #define RELOC           struct external_reloc
 143 #define RELSZ           10              /* sizeof (RELOC) */
 144
 145 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 146
 147 /*
 148 ** Relocation types for the Am29000
 149 */
 150
 151 #define R_ABS           0       /* reference is absolute */
 152
 153 #define R_IREL          030     /* instruction relative (jmp/call) */
 154 #define R_IABS          031     /* instruction absolute (jmp/call) */
 155 #define R_ILOHALF       032     /* instruction low half  (const)  */
 156 #define R_IHIHALF       033     /* instruction high half (consth) part 1 */
 157 #define R_IHCONST       034     /* instruction high half (consth) part 2 */
 158                                 /* constant offset of R_IHIHALF relocation */
 159 #define R_BYTE          035     /* relocatable byte value */
 160 #define R_HWORD         036     /* relocatable halfword value */
 161 #define R_WORD          037     /* relocatable word value */
 162
 163 #define R_IGLBLRC       040     /* instruction global register RC */
 164 #define R_IGLBLRA       041     /* instruction global register RA */
 165 #define R_IGLBLRB       042     /* instruction global register RB */
 166
 167 /*
 168 NOTE:
 169 All the "I" forms refer to 29000 instruction formats.  The linker is
 170 expected to know how the numeric information is split and/or aligned
 171 within the instruction word(s).  R_BYTE works for instructions, too.
 172
 173 If the parameter to a CONSTH instruction is a relocatable type, two
 174 relocation records are written.  The first has an r_type of R_IHIHALF
 175 (33 octal) and a normal r_vaddr and r_symndx.  The second relocation
 176 record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
 177 is redundant), and an r_symndx containing the 32-bit constant offset
 178 to the relocation instead of the actual symbol table index.  This
 179 second record is always written, even if the constant offset is zero.
 180 The constant fields of the instruction are set to zero.
 181 */
 182
 183 /*--------------------------------------------------------------*/
 184
 185 /*
 186 ** Line number entry declaration and related definitions
 187 */
 188
 189 struct external_lineno
 190 {
 191    union {
 192          char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
 193          char l_paddr[4];  /* (physical) address of line number    */
 194    } l_addr;
 195    char l_lnno[2];      /* line number    */
 196 };
 197
 198 #define LINENO          struct external_lineno
 199 #define LINESZ          6               /* sizeof (LINENO) */
 200
 201 /*--------------------------------------------------------------*/
 202
 203 /*
 204 ** Symbol entry declaration and related definitions
 205 */
 206
 207 #define E_SYMNMLEN      8       /* Number of characters in a symbol name */
 208
 209 struct external_syment
 210 {
 211   union {
 212     char e_name[E_SYMNMLEN];
 213     struct {
 214       char e_zeroes[4];
 215       char e_offset[4];
 216     } e;
 217   } e;
 218   char e_value[4];
 219   char e_scnum[2];
 220   char e_type[2];
 221   char e_sclass[1];
 222   char e_numaux[1];
 223 };
 224
 225 #define SYMENT  struct external_syment
 226 #define SYMESZ  sizeof(SYMENT)
 227
 228 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 229
 230 /*
 231 ** Storage class definitions - new classes for global registers.
 232 */
 233
 234 #define C_GLBLREG       19              /* global register */
 235 #define C_EXTREG        20              /* external global register */
 236 #define C_DEFREG        21              /* ext. def. of global register */
 237
 238
 239 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
 240
 241 /*
 242 ** Derived symbol mask/shifts.
 243 */
 244
 245 #define N_BTMASK        (0xf)
 246 #define N_BTSHFT        (4)
 247 #define N_TMASK         (0x30)
 248 #define N_TSHIFT        (2)
 249
 250 /*--------------------------------------------------------------*/
 251
 252 /*
 253 ** Auxiliary symbol table entry declaration and related
 254 ** definitions.
 255 */
 256
 257 #define E_FILNMLEN      14      /* # characters in a file name    */
 258 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 259
 260 union external_auxent {
 261         struct {
 262                 char x_tagndx[4];       /* str, un, or enum tag indx */
 263                 union {
 264                         struct {
 265                             char  x_lnno[2]; /* declaration line number */
 266                             char  x_size[2]; /* str/union/array size */
 267                         } x_lnsz;
 268                         char x_fsize[4];        /* size of function */
 269                 } x_misc;
 270                 union {
 271                         struct {                /* if ISFCN, tag, or .bb */
 272                             char x_lnnoptr[4];  /* ptr to fcn line # */
 273                             char x_endndx[4];   /* entry ndx past block end */
 274                         } x_fcn;
 275                         struct {                /* if ISARY, up to 4 dimen. */
 276                             char x_dimen[E_DIMNUM][2];
 277                         } x_ary;
 278                 } x_fcnary;
 279                 char x_tvndx[2];                /* tv index */
 280         } x_sym;
 281
 282         union {
 283                 char x_fname[E_FILNMLEN];
 284                 struct {
 285                         char x_zeroes[4];
 286                         char x_offset[4];
 287                 } x_n;
 288         } x_file;
 289
 290         struct {
 291                 char x_scnlen[4];                      /* section length */
 292                 char x_nreloc[2];       /* # relocation entries */
 293                 char x_nlinno[2];       /* # line numbers */
 294         } x_scn;
 295
 296         struct {
 297                 char x_tvfill[4];       /* tv fill value */
 298                 char x_tvlen[2];        /* length of .tv */
 299                 char x_tvran[2][2];     /* tv range */
 300         } x_tv;  /* info about .tv section (in auxent of symbol .tv)) */
 301 };
 302
 303 #define AUXENT          union external_auxent
 304 #define AUXESZ          18