include/bcs88kcoff.h

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