include/coff/mips.h

   1 /* ECOFF support on MIPS machines.
   2    coff/ecoff.h must be included before this file.  */
   3
   4 /********************** FILE HEADER **********************/
   5
   6 struct external_filehdr {
   7   unsigned char f_magic[2];     /* magic number                 */
   8   unsigned char f_nscns[2];     /* number of sections           */
   9   unsigned char f_timdat[4];    /* time & date stamp            */
  10   unsigned char f_symptr[4];    /* file pointer to symtab       */
  11   unsigned char f_nsyms[4];     /* number of symtab entries     */
  12   unsigned char f_opthdr[2];    /* sizeof(optional hdr)         */
  13   unsigned char f_flags[2];     /* flags                        */
  14 };
  15
  16 /* Magic numbers are defined in coff/ecoff.h.  */
  17 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
  18                               ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
  19                               ((x).f_magic!=MIPS_MAGIC_BIG) && \
  20                               ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
  21                               ((x).f_magic!=MIPS_MAGIC_BIG2) && \
  22                               ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
  23                               ((x).f_magic!=MIPS_MAGIC_BIG3))
  24
  25 #define FILHDR  struct external_filehdr
  26 #define FILHSZ  20
  27
  28 /********************** AOUT "OPTIONAL HEADER" **********************/
  29
  30
  31 typedef struct external_aouthdr
  32 {
  33   unsigned char magic[2];       /* type of file                         */
  34   unsigned char vstamp[2];      /* version stamp                        */
  35   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry*/
  36   unsigned char dsize[4];       /* initialized data "  "                */
  37   unsigned char bsize[4];       /* uninitialized data "   "             */
  38   unsigned char entry[4];       /* entry pt.                            */
  39   unsigned char text_start[4];  /* base of text used for this file */
  40   unsigned char data_start[4];  /* base of data used for this file */
  41   unsigned char bss_start[4];   /* base of bss used for this file */
  42   unsigned char gprmask[4];     /* ?? */
  43   unsigned char cprmask[4][4];  /* ?? */
  44   unsigned char gp_value[4];    /* value for gp register */
  45 } AOUTHDR;
  46
  47 /* compute size of a header */
  48
  49 #define AOUTSZ 56
  50 #define AOUTHDRSZ 56
  51
  52 /********************** SECTION HEADER **********************/
  53
  54 struct external_scnhdr {
  55   unsigned char s_name[8];      /* section name                 */
  56   unsigned char s_paddr[4];     /* physical address, aliased s_nlib */
  57   unsigned char s_vaddr[4];     /* virtual address              */
  58   unsigned char s_size[4];      /* section size                 */
  59   unsigned char s_scnptr[4];    /* file ptr to raw data for section */
  60   unsigned char s_relptr[4];    /* file ptr to relocation       */
  61   unsigned char s_lnnoptr[4];   /* file ptr to line numbers     */
  62   unsigned char s_nreloc[2];    /* number of relocation entries */
  63   unsigned char s_nlnno[2];     /* number of line number entries*/
  64   unsigned char s_flags[4];     /* flags                        */
  65 };
  66
  67 #define SCNHDR  struct external_scnhdr
  68 #define SCNHSZ  40
  69
  70 /********************** RELOCATION DIRECTIVES **********************/
  71
  72 struct external_reloc {
  73   unsigned char r_vaddr[4];
  74   unsigned char r_bits[4];
  75 };
  76
  77 #define RELOC struct external_reloc
  78 #define RELSZ 8
  79
  80 /* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
  81    are used to unpack the r_bits field.  */
  82
  83 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
  84 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0
  85
  86 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
  87 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8
  88
  89 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
  90 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16
  91
  92 /* Originally, ECOFF used four bits for the reloc type and had three
  93    reserved bits.  Irix 4 added another bit for the reloc type, which
  94    was easy because it was big endian and one of the spare bits became
  95    the new most significant bit.  To make this also work for little
  96    endian ECOFF, we need to wrap one of the reserved bits around to
  97    become the most significant bit of the reloc type.  */
  98 #define RELOC_BITS3_TYPE_BIG                    0x3E
  99 #define RELOC_BITS3_TYPE_SH_BIG                 1
 100 #define RELOC_BITS3_TYPE_LITTLE                 0x78
 101 #define RELOC_BITS3_TYPE_SH_LITTLE              3
 102 #define RELOC_BITS3_TYPEHI_LITTLE               0x04
 103 #define RELOC_BITS3_TYPEHI_SH_LITTLE            2
 104
 105 #define RELOC_BITS3_EXTERN_BIG                  0x01
 106 #define RELOC_BITS3_EXTERN_LITTLE               0x80
 107
 108 /* The r_type field in a reloc is one of the following values.  I
 109    don't know if any other values can appear.  These seem to be all
 110    that occur in the Ultrix 4.2 libraries.  */
 111 #define MIPS_R_IGNORE   0
 112 #define MIPS_R_REFHALF  1
 113 #define MIPS_R_REFWORD  2
 114 #define MIPS_R_JMPADDR  3
 115 #define MIPS_R_REFHI    4
 116 #define MIPS_R_REFLO    5
 117 #define MIPS_R_GPREL    6
 118 #define MIPS_R_LITERAL  7
 119
 120 /* These reloc types are a Cygnus extension used when generating
 121    position independent code for embedded systems.  The numbers are
 122    taken from Irix 4, but at least for internal relocs Irix 5 does not
 123    give them the same meaning.  For an internal reloc the symbol index
 124    of RELHI and RELLO is modified as described below for
 125    MIPS_R_SWITCH.  */
 126 #define MIPS_R_PCREL16  12
 127 #define MIPS_R_RELHI    13
 128 #define MIPS_R_RELLO    14
 129
 130 /* This reloc type is a Cygnus extension used when generating position
 131    independent code for embedded systems.  It is used for an entry in
 132    a switch table, which looks like this:
 133      .word $L3-$LS12
 134    The object file will contain the correct difference, and does not
 135    require adjustment.  However, when the linker is relaxing PC
 136    relative calls, it is possible for $L3 to move farther away.  This
 137    reloc always appears in the .text section, and is always against
 138    the .text section.  However, the symbol index is not
 139    RELOC_SECTION_TEXT.  It is, instead, the distance between this
 140    switch table entry and $LS12.  Thus, the original value of $L12 is
 141      vaddr - symndx
 142    and the original value of $L3 is
 143      vaddr - symndx + addend
 144    where addend is the value in the object file.  Knowing this, the
 145    linker can know whether the addend in the object file must be
 146    adjusted.  */
 147 #define MIPS_R_SWITCH   22
 148
 149 /********************** STABS **********************/
 150
 151 #define MIPS_IS_STAB ECOFF_IS_STAB
 152 #define MIPS_MARK_STAB ECOFF_MARK_STAB
 153 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
 154
 155 /********************** SYMBOLIC INFORMATION **********************/
 156
 157 /* Written by John Gilmore.  */
 158
 159 /* ECOFF uses COFF-like section structures, but its own symbol format.
 160    This file defines the symbol format in fields whose size and alignment
 161    will not vary on different host systems.  */
 162
 163 /* File header as a set of bytes */
 164
 165 struct hdr_ext {
 166         unsigned char   h_magic[2];
 167         unsigned char   h_vstamp[2];
 168         unsigned char   h_ilineMax[4];
 169         unsigned char   h_cbLine[4];
 170         unsigned char   h_cbLineOffset[4];
 171         unsigned char   h_idnMax[4];
 172         unsigned char   h_cbDnOffset[4];
 173         unsigned char   h_ipdMax[4];
 174         unsigned char   h_cbPdOffset[4];
 175         unsigned char   h_isymMax[4];
 176         unsigned char   h_cbSymOffset[4];
 177         unsigned char   h_ioptMax[4];
 178         unsigned char   h_cbOptOffset[4];
 179         unsigned char   h_iauxMax[4];
 180         unsigned char   h_cbAuxOffset[4];
 181         unsigned char   h_issMax[4];
 182         unsigned char   h_cbSsOffset[4];
 183         unsigned char   h_issExtMax[4];
 184         unsigned char   h_cbSsExtOffset[4];
 185         unsigned char   h_ifdMax[4];
 186         unsigned char   h_cbFdOffset[4];
 187         unsigned char   h_crfd[4];
 188         unsigned char   h_cbRfdOffset[4];
 189         unsigned char   h_iextMax[4];
 190         unsigned char   h_cbExtOffset[4];
 191 };
 192
 193 /* File descriptor external record */
 194
 195 struct fdr_ext {
 196         unsigned char   f_adr[4];
 197         unsigned char   f_rss[4];
 198         unsigned char   f_issBase[4];
 199         unsigned char   f_cbSs[4];
 200         unsigned char   f_isymBase[4];
 201         unsigned char   f_csym[4];
 202         unsigned char   f_ilineBase[4];
 203         unsigned char   f_cline[4];
 204         unsigned char   f_ioptBase[4];
 205         unsigned char   f_copt[4];
 206         unsigned char   f_ipdFirst[2];
 207         unsigned char   f_cpd[2];
 208         unsigned char   f_iauxBase[4];
 209         unsigned char   f_caux[4];
 210         unsigned char   f_rfdBase[4];
 211         unsigned char   f_crfd[4];
 212         unsigned char   f_bits1[1];
 213         unsigned char   f_bits2[3];
 214         unsigned char   f_cbLineOffset[4];
 215         unsigned char   f_cbLine[4];
 216 };
 217
 218 #define FDR_BITS1_LANG_BIG              0xF8
 219 #define FDR_BITS1_LANG_SH_BIG           3
 220 #define FDR_BITS1_LANG_LITTLE           0x1F
 221 #define FDR_BITS1_LANG_SH_LITTLE        0
 222
 223 #define FDR_BITS1_FMERGE_BIG            0x04
 224 #define FDR_BITS1_FMERGE_LITTLE         0x20
 225
 226 #define FDR_BITS1_FREADIN_BIG           0x02
 227 #define FDR_BITS1_FREADIN_LITTLE        0x40
 228
 229 #define FDR_BITS1_FBIGENDIAN_BIG        0x01
 230 #define FDR_BITS1_FBIGENDIAN_LITTLE     0x80
 231
 232 #define FDR_BITS2_GLEVEL_BIG            0xC0
 233 #define FDR_BITS2_GLEVEL_SH_BIG         6
 234 #define FDR_BITS2_GLEVEL_LITTLE         0x03
 235 #define FDR_BITS2_GLEVEL_SH_LITTLE      0
 236
 237 /* We ignore the `reserved' field in bits2. */
 238
 239 /* Procedure descriptor external record */
 240
 241 struct pdr_ext {
 242         unsigned char   p_adr[4];
 243         unsigned char   p_isym[4];
 244         unsigned char   p_iline[4];
 245         unsigned char   p_regmask[4];
 246         unsigned char   p_regoffset[4];
 247         unsigned char   p_iopt[4];
 248         unsigned char   p_fregmask[4];
 249         unsigned char   p_fregoffset[4];
 250         unsigned char   p_frameoffset[4];
 251         unsigned char   p_framereg[2];
 252         unsigned char   p_pcreg[2];
 253         unsigned char   p_lnLow[4];
 254         unsigned char   p_lnHigh[4];
 255         unsigned char   p_cbLineOffset[4];
 256 };
 257
 258 /* Runtime procedure table */
 259
 260 struct rpdr_ext {
 261         unsigned char   p_adr[4];
 262         unsigned char   p_regmask[4];
 263         unsigned char   p_regoffset[4];
 264         unsigned char   p_fregmask[4];
 265         unsigned char   p_fregoffset[4];
 266         unsigned char   p_frameoffset[4];
 267         unsigned char   p_framereg[2];
 268         unsigned char   p_pcreg[2];
 269         unsigned char   p_irpss[4];
 270         unsigned char   p_reserved[4];
 271         unsigned char   p_exception_info[4];
 272 };
 273
 274 /* Line numbers */
 275
 276 struct line_ext {
 277         unsigned char   l_line[4];
 278 };
 279
 280 /* Symbol external record */
 281
 282 struct sym_ext {
 283         unsigned char   s_iss[4];
 284         unsigned char   s_value[4];
 285         unsigned char   s_bits1[1];
 286         unsigned char   s_bits2[1];
 287         unsigned char   s_bits3[1];
 288         unsigned char   s_bits4[1];
 289 };
 290
 291 #define SYM_BITS1_ST_BIG                0xFC
 292 #define SYM_BITS1_ST_SH_BIG             2
 293 #define SYM_BITS1_ST_LITTLE             0x3F
 294 #define SYM_BITS1_ST_SH_LITTLE          0
 295
 296 #define SYM_BITS1_SC_BIG                0x03
 297 #define SYM_BITS1_SC_SH_LEFT_BIG        3
 298 #define SYM_BITS1_SC_LITTLE             0xC0
 299 #define SYM_BITS1_SC_SH_LITTLE          6
 300
 301 #define SYM_BITS2_SC_BIG                0xE0
 302 #define SYM_BITS2_SC_SH_BIG             5
 303 #define SYM_BITS2_SC_LITTLE             0x07
 304 #define SYM_BITS2_SC_SH_LEFT_LITTLE     2
 305
 306 #define SYM_BITS2_RESERVED_BIG          0x10
 307 #define SYM_BITS2_RESERVED_LITTLE       0x08
 308
 309 #define SYM_BITS2_INDEX_BIG             0x0F
 310 #define SYM_BITS2_INDEX_SH_LEFT_BIG     16
 311 #define SYM_BITS2_INDEX_LITTLE          0xF0
 312 #define SYM_BITS2_INDEX_SH_LITTLE       4
 313
 314 #define SYM_BITS3_INDEX_SH_LEFT_BIG     8
 315 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4
 316
 317 #define SYM_BITS4_INDEX_SH_LEFT_BIG     0
 318 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12
 319
 320 /* External symbol external record */
 321
 322 struct ext_ext {
 323         unsigned char   es_bits1[1];
 324         unsigned char   es_bits2[1];
 325         unsigned char   es_ifd[2];
 326         struct  sym_ext es_asym;
 327 };
 328
 329 #define EXT_BITS1_JMPTBL_BIG            0x80
 330 #define EXT_BITS1_JMPTBL_LITTLE         0x01
 331
 332 #define EXT_BITS1_COBOL_MAIN_BIG        0x40
 333 #define EXT_BITS1_COBOL_MAIN_LITTLE     0x02
 334
 335 #define EXT_BITS1_WEAKEXT_BIG           0x20
 336 #define EXT_BITS1_WEAKEXT_LITTLE        0x04
 337
 338 /* Dense numbers external record */
 339
 340 struct dnr_ext {
 341         unsigned char   d_rfd[4];
 342         unsigned char   d_index[4];
 343 };
 344
 345 /* Relative file descriptor */
 346
 347 struct rfd_ext {
 348   unsigned char rfd[4];
 349 };
 350
 351 /* Optimizer symbol external record */
 352
 353 struct opt_ext {
 354   unsigned char o_bits1[1];
 355   unsigned char o_bits2[1];
 356   unsigned char o_bits3[1];
 357   unsigned char o_bits4[1];
 358   struct rndx_ext o_rndx;
 359   unsigned char o_offset[4];
 360 };
 361
 362 #define OPT_BITS2_VALUE_SH_LEFT_BIG     16
 363 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0
 364
 365 #define OPT_BITS3_VALUE_SH_LEFT_BIG     8
 366 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8
 367
 368 #define OPT_BITS4_VALUE_SH_LEFT_BIG     0
 369 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16