include/bcs88kcoff.h

   1 /*** coff information for 88k bcs */
   2
   3 #ifndef M88
   4 #define M88
   5 #endif
   6
   7 /********************** FILE HEADER **********************/
   8
   9 struct filehdr {
  10         unsigned short  f_magic;        /* magic number                 */
  11         unsigned short  f_nscns;        /* number of sections           */
  12         long            f_timdat;       /* time & date stamp            */
  13         long            f_symptr;       /* file pointer to symtab       */
  14         long            f_nsyms;        /* number of symtab entries     */
  15         unsigned short  f_opthdr;       /* sizeof(optional hdr)         */
  16         unsigned short  f_flags;        /* flags                        */
  17 };
  18
  19 /* Bits for f_flags:
  20  *      F_RELFLG        relocation info stripped from file
  21  *      F_EXEC          file is executable (no unresolved externel references)
  22  *      F_LNNO          line nunbers stripped from file
  23  *      F_LSYMS         local symbols stripped from file
  24  *      F_AR32WR        file has byte ordering of an AR32WR machine (e.g. vax)
  25  */
  26 #define F_RELFLG        0000001
  27 #define F_EXEC          0000002
  28 #define F_LNNO          0000004
  29 #define F_LSYMS 0000010
  30 #define F_AR32WR        0000400
  31
  32
  33 #define MC88MAGIC 0555           /* 88k BCS executable */
  34 #define MC88DMAGIC 0541          /* DG/UX executable   */
  35
  36
  37 #define MC88BADMAG(x) (((x).f_magic!=MC88MAGIC) && ((x).f_magic!=MC88DMAGIC))
  38
  39 #define FILHDR  struct filehdr
  40 #define FILHSZ  sizeof(FILHDR)
  41
  42
  43 /********************** AOUT "OPTIONAL HEADER" **********************/
  44
  45
  46 #define PAGEMAGIC3 0414 /* Split i&d, zero mapped */
  47 typedef struct aouthdr {
  48         short           magic;  /* type of file                         */
  49         short           vstamp; /* version stamp                        */
  50         unsigned long   tsize;  /* text size in bytes, padded to FW bdry*/
  51         unsigned long   dsize;  /* initialized data "  "                */
  52         unsigned long   bsize;  /* uninitialized data "   "             */
  53
  54         unsigned long   entry;  /* entry pt.                            */
  55         unsigned long   text_start;     /* base of text used for this file */
  56         unsigned long   data_start;     /* base of data used for this file */
  57
  58 } AOUTHDR;
  59
  60
  61 /* compute size of a header */
  62
  63 #define AOUTSZ (sizeof(AOUTHDR))
  64
  65 /********************** STORAGE CLASSES **********************/
  66
  67 #define C_EFCN          -1      /* physical end of function     */
  68 #define C_NULL          0
  69 #define C_AUTO          1       /* automatic variable           */
  70 #define C_EXT           2       /* external symbol              */
  71 #define C_STAT          3       /* static                       */
  72 #define C_REG           4       /* register variable            */
  73 #define C_EXTDEF        5       /* external definition          */
  74 #define C_LABEL         6       /* label                        */
  75 #define C_ULABEL        7       /* undefined label              */
  76 #define C_MOS           8       /* member of structure          */
  77 #define C_ARG           9       /* function argument            */
  78 #define C_STRTAG        10      /* structure tag                */
  79 #define C_MOU           11      /* member of union              */
  80 #define C_UNTAG         12      /* union tag                    */
  81 #define C_TPDEF         13      /* type definition              */
  82 #define C_USTATIC       14      /* undefined static             */
  83 #define C_ENTAG         15      /* enumeration tag              */
  84 #define C_MOE           16      /* member of enumeration        */
  85 #define C_REGPARM       17      /* register parameter           */
  86 #define C_FIELD         18      /* bit field                    */
  87 #define C_BLOCK         100     /* ".bb" or ".eb"               */
  88 #define C_FCN           101     /* ".bf" or ".ef"               */
  89 #define C_EOS           102     /* end of structure             */
  90 #define C_FILE          103     /* file name                    */
  91 #define C_LINE          104     /* line # reformatted as symbol table entry */
  92 #define C_ALIAS         105     /* duplicate tag                */
  93 #define C_HIDDEN        106     /* ext symbol in dmert public lib */
  94 #define C_SHADOW        107     /* shadow symbol                */
  95 #define C_VERSION       108     /* coff version symbol          */
  96
  97
  98 /********************** SECTION HEADER **********************/
  99
 100 struct scnhdr {
 101         char            s_name[8];      /* section name                 */
 102         long            s_paddr;        /* physical address, aliased s_nlib */
 103         long            s_vaddr;        /* virtual address              */
 104         long            s_size;         /* section size                 */
 105         long            s_scnptr;       /* file ptr to raw data for section */
 106         long            s_relptr;       /* file ptr to relocation       */
 107         long            s_lnnoptr;      /* file ptr to line numbers     */
 108         long            s_nreloc;       /* number of relocation entries */
 109         long            s_nlnno;        /* number of line number entries*/
 110         long            s_flags;        /* flags                        */
 111 };
 112
 113 /*
 114  * names of "special" sections
 115  */
 116 #define _TEXT   ".text"
 117 #define _DATA   ".data"
 118 #define _BSS    ".bss"
 119
 120 /*
 121  * s_flags "type"
 122  */
 123 #define STYP_TEXT       0x20            /* section contains text only   */
 124 #define STYP_DATA       0x40            /* section contains data only   */
 125 #define STYP_BSS        0x80            /* section contains bss only    */
 126
 127 #define SCNHDR  struct scnhdr
 128 #define SCNHSZ  sizeof(SCNHDR)
 129
 130
 131 /********************** LINE NUMBERS **********************/
 132
 133 /* 1 line number entry for every "breakpointable" source line in a section.
 134  * Line numbers are grouped on a per function basis; first entry in a function
 135  * grouping will have l_lnno = 0 and in place of physical address will be the
 136  * symbol table index of the function name.
 137  */
 138 struct lineno{
 139         union {
 140                 long l_symndx;  /* function name symbol index, iff l_lnno == 0*/
 141                 long l_paddr;   /* (physical) address of line number    */
 142         } l_addr;
 143
 144         long l_lnno;
 145
 146 };
 147
 148 #define LINENO  struct lineno
 149 #define LINESZ  sizeof(LINENO)
 150
 151
 152 /********************** SYMBOLS **********************/
 153
 154 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 155 #define E_FILNMLEN      14      /* # characters in a file name          */
 156 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 157
 158
 159 struct syment {
 160         union {
 161                 char    _n_name[E_SYMNMLEN];    /* old COFF version     */
 162                 struct {
 163                         long    _n_zeroes;      /* new == 0             */
 164                         long    _n_offset;      /* offset into string table */
 165                 } _n_n;
 166                 char    *_n_nptr[2];    /* allows for overlaying        */
 167         } _n;
 168         long            n_value;        /* value of symbol              */
 169         short           n_scnum;        /* section number               */
 170         unsigned short  n_type;         /* type and derived type        */
 171         char            n_sclass;       /* storage class                */
 172         char            n_numaux;       /* number of aux. entries       */
 173         char            pad2[2];        /* force alignment              */
 174 };
 175
 176 #define n_name          _n._n_name
 177 #define n_zeroes        _n._n_n._n_zeroes
 178 #define n_offset        _n._n_n._n_offset
 179
 180 /*
 181  * Relocatable symbols have number of the section in which they are defined,
 182  * or one of the following:
 183  */
 184 #define N_UNDEF 0       /* undefined symbol                             */
 185 #define N_ABS   -1      /* value of symbol is absolute                  */
 186 #define N_DEBUG -2      /* debugging symbol -- symbol value is meaningless */
 187
 188 /*
 189  * Type of a symbol, in low 4 bits of the word
 190  */
 191 #define T_NULL          0
 192 #define T_VOID          1       /* function argument (only used by compiler) */
 193 #define T_CHAR          2       /* character            */
 194 #define T_SHORT         3       /* short integer        */
 195 #define T_INT           4       /* integer              */
 196 #define T_LONG          5       /* long integer         */
 197 #define T_FLOAT         6       /* floating point       */
 198 #define T_DOUBLE        7       /* double word          */
 199 #define T_STRUCT        8       /* structure            */
 200 #define T_UNION         9       /* union                */
 201 #define T_ENUM          10      /* enumeration          */
 202 #define T_MOE           11      /* member of enumeration*/
 203 #define T_UCHAR         12      /* unsigned character   */
 204 #define T_USHORT        13      /* unsigned short       */
 205 #define T_UINT          14      /* unsigned integer     */
 206 #define T_ULONG         15      /* unsigned long        */
 207
 208
 209
 210 /*
 211  * derived types
 212  */
 213 #define DT_NON          0
 214 #define DT_PTR          1       /* pointer      */
 215 #define DT_FCN          2       /* function     */
 216 #define DT_ARY          3       /* array        */
 217
 218 #define N_BTMASK        017
 219 #define N_TMASK         060
 220 #define N_BTSHFT        4
 221 #define N_TSHIFT        2
 222
 223 #define BTYPE(x)        ((x) & N_BTMASK)
 224
 225
 226 #define ISPTR(x)        (((x) & N_TMASK) == (DT_PTR << N_BTSHFT))
 227 #define ISFCN(x)        (((x) & N_TMASK) == (DT_FCN << N_BTSHFT))
 228 #define ISARY(x)        (((x) & N_TMASK) == (DT_ARY << N_BTSHFT))
 229
 230 #define DECREF(x) ((((x)>>N_TSHIFT)&~N_BTMASK)|((x)&N_BTMASK))
 231
 232 union auxent {
 233         struct {
 234                 long x_tagndx;  /* str, un, or enum tag indx */
 235                 union {
 236                         struct {
 237                             unsigned long x_lnno; /* declaration line number */
 238                             unsigned long x_size; /* str/union/array size */
 239                         } x_lnsz;
 240                         long x_fsize;   /* size of function */
 241                 } x_misc;
 242                 union {
 243                         struct {                /* if ISFCN, tag, or .bb */
 244                             long x_lnnoptr;     /* ptr to fcn line # */
 245                             long x_endndx;      /* entry ndx past block end */
 246                         } x_fcn;
 247                         struct {                /* if ISARY, up to 4 dimen. */
 248                             unsigned short x_dimen[E_DIMNUM];
 249                         } x_ary;
 250                 } x_fcnary;
 251                 unsigned short x_tvndx;         /* tv index */
 252         } x_sym;
 253
 254         union {
 255                 char x_fname[E_FILNMLEN];
 256                 struct {
 257                         long x_zeroes;
 258                         long x_offset;
 259                 } x_n;
 260         } x_file;
 261
 262         struct {
 263                 long x_scnlen;                  /* section length */
 264                 unsigned long x_nreloc; /* # relocation entries */
 265                 unsigned long x_nlinno; /* # line numbers */
 266         } x_scn;
 267
 268
 269 };
 270
 271 #define SYMENT  struct syment
 272 #define SYMESZ  sizeof(SYMENT)
 273 #define AUXENT  union auxent
 274 #define AUXESZ  sizeof(AUXENT)
 275
 276
 277 /********************** RELOCATION DIRECTIVES **********************/
 278
 279 struct reloc {
 280         long r_vaddr;           /* Virtual address of reference */
 281         long r_symndx;          /* Index into symbol table      */
 282         unsigned short r_type;  /* Relocation type              */
 283         unsigned short r_offset;/* Hi 16 bits of constant       */
 284 };
 285
 286 /* Only values of r_type GNU/88k cares about */
 287 #define R_PCR16L 128
 288 #define R_PCR26L 129
 289 #define R_VRT16  130
 290 #define R_HVRT16 131
 291 #define R_LVRT16 132
 292 #define R_VRT32  133
 293
 294
 295
 296
 297 #define RELOC struct reloc
 298 #define RELSZ sizeof(RELOC)
 299
 300 #define DEFAULT_SECTION_ALIGNMENT 8 /* double word */