include/coff/mips.h

   1 /* ECOFF support on MIPS machines.
   2    coff/ecoff.h must be included before this file.
   3
   4    Copyright 1999, 2004 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  19
  20 #define DO_NOT_DEFINE_AOUTHDR
  21 #define L_LNNO_SIZE 4
  22 #include "coff/external.h"
  23
  24 /* Magic numbers are defined in coff/ecoff.h.  */
  25 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
  26                               ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
  27                               ((x).f_magic!=MIPS_MAGIC_BIG) && \
  28                               ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
  29                               ((x).f_magic!=MIPS_MAGIC_BIG2) && \
  30                               ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
  31                               ((x).f_magic!=MIPS_MAGIC_BIG3))
  32
  33
  34 /********************** AOUT "OPTIONAL HEADER" **********************/
  35
  36 typedef struct external_aouthdr
  37 {
  38   unsigned char magic[2];       /* type of file                         */
  39   unsigned char vstamp[2];      /* version stamp                        */
  40   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry*/
  41   unsigned char dsize[4];       /* initialized data "  "                */
  42   unsigned char bsize[4];       /* uninitialized data "   "             */
  43   unsigned char entry[4];       /* entry pt.                            */
  44   unsigned char text_start[4];  /* base of text used for this file */
  45   unsigned char data_start[4];  /* base of data used for this file */
  46   unsigned char bss_start[4];   /* base of bss used for this file */
  47   unsigned char gprmask[4];     /* ?? */
  48   unsigned char cprmask[4][4];  /* ?? */
  49   unsigned char gp_value[4];    /* value for gp register */
  50 } AOUTHDR;
  51
  52 /* compute size of a header */
  53
  54 #define AOUTSZ 56
  55 #define AOUTHDRSZ 56
  56
  57 /********************** RELOCATION DIRECTIVES **********************/
  58
  59 struct external_reloc
  60   {
  61     unsigned char r_vaddr[4];
  62     unsigned char r_bits[4];
  63   };
  64
  65 #define RELOC struct external_reloc
  66 #define RELSZ 8
  67
  68 /* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
  69    are used to unpack the r_bits field.  */
  70
  71 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
  72 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0
  73
  74 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
  75 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8
  76
  77 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
  78 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16
  79
  80 /* Originally, ECOFF used four bits for the reloc type and had three
  81    reserved bits.  Irix 4 added another bit for the reloc type, which
  82    was easy because it was big endian and one of the spare bits became
  83    the new most significant bit.  To make this also work for little
  84    endian ECOFF, we need to wrap one of the reserved bits around to
  85    become the most significant bit of the reloc type.  */
  86 #define RELOC_BITS3_TYPE_BIG                    0x3E
  87 #define RELOC_BITS3_TYPE_SH_BIG                 1
  88 #define RELOC_BITS3_TYPE_LITTLE                 0x78
  89 #define RELOC_BITS3_TYPE_SH_LITTLE              3
  90 #define RELOC_BITS3_TYPEHI_LITTLE               0x04
  91 #define RELOC_BITS3_TYPEHI_SH_LITTLE            2
  92
  93 #define RELOC_BITS3_EXTERN_BIG                  0x01
  94 #define RELOC_BITS3_EXTERN_LITTLE               0x80
  95
  96 /* The r_type field in a reloc is one of the following values.  I
  97    don't know if any other values can appear.  These seem to be all
  98    that occur in the Ultrix 4.2 libraries.  */
  99 #define MIPS_R_IGNORE   0
 100 #define MIPS_R_REFHALF  1
 101 #define MIPS_R_REFWORD  2
 102 #define MIPS_R_JMPADDR  3
 103 #define MIPS_R_REFHI    4
 104 #define MIPS_R_REFLO    5
 105 #define MIPS_R_GPREL    6
 106 #define MIPS_R_LITERAL  7
 107
 108 /* FIXME: This relocation is used (internally only) to represent branches
 109    when assembling.  It should never appear in output files, and
 110    be removed.  (It used to be used for embedded-PIC support.)  */
 111 #define MIPS_R_PCREL16  12
 112
 113 /********************** STABS **********************/
 114
 115 #define MIPS_IS_STAB ECOFF_IS_STAB
 116 #define MIPS_MARK_STAB ECOFF_MARK_STAB
 117 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
 118
 119 /********************** SYMBOLIC INFORMATION **********************/
 120
 121 /* Written by John Gilmore.  */
 122
 123 /* ECOFF uses COFF-like section structures, but its own symbol format.
 124    This file defines the symbol format in fields whose size and alignment
 125    will not vary on different host systems.  */
 126
 127 /* File header as a set of bytes */
 128
 129 struct hdr_ext
 130 {
 131         unsigned char   h_magic[2];
 132         unsigned char   h_vstamp[2];
 133         unsigned char   h_ilineMax[4];
 134         unsigned char   h_cbLine[4];
 135         unsigned char   h_cbLineOffset[4];
 136         unsigned char   h_idnMax[4];
 137         unsigned char   h_cbDnOffset[4];
 138         unsigned char   h_ipdMax[4];
 139         unsigned char   h_cbPdOffset[4];
 140         unsigned char   h_isymMax[4];
 141         unsigned char   h_cbSymOffset[4];
 142         unsigned char   h_ioptMax[4];
 143         unsigned char   h_cbOptOffset[4];
 144         unsigned char   h_iauxMax[4];
 145         unsigned char   h_cbAuxOffset[4];
 146         unsigned char   h_issMax[4];
 147         unsigned char   h_cbSsOffset[4];
 148         unsigned char   h_issExtMax[4];
 149         unsigned char   h_cbSsExtOffset[4];
 150         unsigned char   h_ifdMax[4];
 151         unsigned char   h_cbFdOffset[4];
 152         unsigned char   h_crfd[4];
 153         unsigned char   h_cbRfdOffset[4];
 154         unsigned char   h_iextMax[4];
 155         unsigned char   h_cbExtOffset[4];
 156 };
 157
 158 /* File descriptor external record */
 159
 160 struct fdr_ext
 161 {
 162         unsigned char   f_adr[4];
 163         unsigned char   f_rss[4];
 164         unsigned char   f_issBase[4];
 165         unsigned char   f_cbSs[4];
 166         unsigned char   f_isymBase[4];
 167         unsigned char   f_csym[4];
 168         unsigned char   f_ilineBase[4];
 169         unsigned char   f_cline[4];
 170         unsigned char   f_ioptBase[4];
 171         unsigned char   f_copt[4];
 172         unsigned char   f_ipdFirst[2];
 173         unsigned char   f_cpd[2];
 174         unsigned char   f_iauxBase[4];
 175         unsigned char   f_caux[4];
 176         unsigned char   f_rfdBase[4];
 177         unsigned char   f_crfd[4];
 178         unsigned char   f_bits1[1];
 179         unsigned char   f_bits2[3];
 180         unsigned char   f_cbLineOffset[4];
 181         unsigned char   f_cbLine[4];
 182 };
 183
 184 #define FDR_BITS1_LANG_BIG              0xF8
 185 #define FDR_BITS1_LANG_SH_BIG           3
 186 #define FDR_BITS1_LANG_LITTLE           0x1F
 187 #define FDR_BITS1_LANG_SH_LITTLE        0
 188
 189 #define FDR_BITS1_FMERGE_BIG            0x04
 190 #define FDR_BITS1_FMERGE_LITTLE         0x20
 191
 192 #define FDR_BITS1_FREADIN_BIG           0x02
 193 #define FDR_BITS1_FREADIN_LITTLE        0x40
 194
 195 #define FDR_BITS1_FBIGENDIAN_BIG        0x01
 196 #define FDR_BITS1_FBIGENDIAN_LITTLE     0x80
 197
 198 #define FDR_BITS2_GLEVEL_BIG            0xC0
 199 #define FDR_BITS2_GLEVEL_SH_BIG         6
 200 #define FDR_BITS2_GLEVEL_LITTLE         0x03
 201 #define FDR_BITS2_GLEVEL_SH_LITTLE      0
 202
 203 /* We ignore the `reserved' field in bits2. */
 204
 205 /* Procedure descriptor external record */
 206
 207 struct pdr_ext
 208 {
 209         unsigned char   p_adr[4];
 210         unsigned char   p_isym[4];
 211         unsigned char   p_iline[4];
 212         unsigned char   p_regmask[4];
 213         unsigned char   p_regoffset[4];
 214         unsigned char   p_iopt[4];
 215         unsigned char   p_fregmask[4];
 216         unsigned char   p_fregoffset[4];
 217         unsigned char   p_frameoffset[4];
 218         unsigned char   p_framereg[2];
 219         unsigned char   p_pcreg[2];
 220         unsigned char   p_lnLow[4];
 221         unsigned char   p_lnHigh[4];
 222         unsigned char   p_cbLineOffset[4];
 223 };
 224
 225 /* Runtime procedure table */
 226
 227 struct rpdr_ext
 228 {
 229         unsigned char   p_adr[4];
 230         unsigned char   p_regmask[4];
 231         unsigned char   p_regoffset[4];
 232         unsigned char   p_fregmask[4];
 233         unsigned char   p_fregoffset[4];
 234         unsigned char   p_frameoffset[4];
 235         unsigned char   p_framereg[2];
 236         unsigned char   p_pcreg[2];
 237         unsigned char   p_irpss[4];
 238         unsigned char   p_reserved[4];
 239         unsigned char   p_exception_info[4];
 240 };
 241
 242 /* Line numbers */
 243
 244 struct line_ext
 245 {
 246         unsigned char   l_line[4];
 247 };
 248
 249 /* Symbol external record */
 250
 251 struct sym_ext
 252 {
 253         unsigned char   s_iss[4];
 254         unsigned char   s_value[4];
 255         unsigned char   s_bits1[1];
 256         unsigned char   s_bits2[1];
 257         unsigned char   s_bits3[1];
 258         unsigned char   s_bits4[1];
 259 };
 260
 261 #define SYM_BITS1_ST_BIG                0xFC
 262 #define SYM_BITS1_ST_SH_BIG             2
 263 #define SYM_BITS1_ST_LITTLE             0x3F
 264 #define SYM_BITS1_ST_SH_LITTLE          0
 265
 266 #define SYM_BITS1_SC_BIG                0x03
 267 #define SYM_BITS1_SC_SH_LEFT_BIG        3
 268 #define SYM_BITS1_SC_LITTLE             0xC0
 269 #define SYM_BITS1_SC_SH_LITTLE          6
 270
 271 #define SYM_BITS2_SC_BIG                0xE0
 272 #define SYM_BITS2_SC_SH_BIG             5
 273 #define SYM_BITS2_SC_LITTLE             0x07
 274 #define SYM_BITS2_SC_SH_LEFT_LITTLE     2
 275
 276 #define SYM_BITS2_RESERVED_BIG          0x10
 277 #define SYM_BITS2_RESERVED_LITTLE       0x08
 278
 279 #define SYM_BITS2_INDEX_BIG             0x0F
 280 #define SYM_BITS2_INDEX_SH_LEFT_BIG     16
 281 #define SYM_BITS2_INDEX_LITTLE          0xF0
 282 #define SYM_BITS2_INDEX_SH_LITTLE       4
 283
 284 #define SYM_BITS3_INDEX_SH_LEFT_BIG     8
 285 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4
 286
 287 #define SYM_BITS4_INDEX_SH_LEFT_BIG     0
 288 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12
 289
 290 /* External symbol external record */
 291
 292 struct ext_ext
 293 {
 294         unsigned char   es_bits1[1];
 295         unsigned char   es_bits2[1];
 296         unsigned char   es_ifd[2];
 297         struct  sym_ext es_asym;
 298 };
 299
 300 #define EXT_BITS1_JMPTBL_BIG            0x80
 301 #define EXT_BITS1_JMPTBL_LITTLE         0x01
 302
 303 #define EXT_BITS1_COBOL_MAIN_BIG        0x40
 304 #define EXT_BITS1_COBOL_MAIN_LITTLE     0x02
 305
 306 #define EXT_BITS1_WEAKEXT_BIG           0x20
 307 #define EXT_BITS1_WEAKEXT_LITTLE        0x04
 308
 309 /* Dense numbers external record */
 310
 311 struct dnr_ext
 312 {
 313         unsigned char   d_rfd[4];
 314         unsigned char   d_index[4];
 315 };
 316
 317 /* Relative file descriptor */
 318
 319 struct rfd_ext
 320 {
 321   unsigned char rfd[4];
 322 };
 323
 324 /* Optimizer symbol external record */
 325
 326 struct opt_ext
 327 {
 328   unsigned char o_bits1[1];
 329   unsigned char o_bits2[1];
 330   unsigned char o_bits3[1];
 331   unsigned char o_bits4[1];
 332   struct rndx_ext o_rndx;
 333   unsigned char o_offset[4];
 334 };
 335
 336 #define OPT_BITS2_VALUE_SH_LEFT_BIG     16
 337 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0
 338
 339 #define OPT_BITS3_VALUE_SH_LEFT_BIG     8
 340 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8
 341
 342 #define OPT_BITS4_VALUE_SH_LEFT_BIG     0
 343 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16