include/coff/mips.h

   1 /* ECOFF support on MIPS machines.
   2    coff/ecoff.h must be included before this file.
   3
   4    Copyright 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 /* These reloc types are a Cygnus extension used when generating
 109    position independent code for embedded systems.  The numbers are
 110    taken from Irix 4, but at least for internal relocs Irix 5 does not
 111    give them the same meaning.  For an internal reloc the symbol index
 112    of RELHI and RELLO is modified as described below for
 113    MIPS_R_SWITCH.  */
 114 #define MIPS_R_PCREL16  12
 115 #define MIPS_R_RELHI    13
 116 #define MIPS_R_RELLO    14
 117
 118 /* This reloc type is a Cygnus extension used when generating position
 119    independent code for embedded systems.  It is used for an entry in
 120    a switch table, which looks like this:
 121      .word $L3-$LS12
 122    The object file will contain the correct difference, and does not
 123    require adjustment.  However, when the linker is relaxing PC
 124    relative calls, it is possible for $L3 to move farther away.  This
 125    reloc always appears in the .text section, and is always against
 126    the .text section.  However, the symbol index is not
 127    RELOC_SECTION_TEXT.  It is, instead, the distance between this
 128    switch table entry and $LS12.  Thus, the original value of $L12 is
 129      vaddr - symndx
 130    and the original value of $L3 is
 131      vaddr - symndx + addend
 132    where addend is the value in the object file.  Knowing this, the
 133    linker can know whether the addend in the object file must be
 134    adjusted.  */
 135 #define MIPS_R_SWITCH   22
 136
 137 /********************** STABS **********************/
 138
 139 #define MIPS_IS_STAB ECOFF_IS_STAB
 140 #define MIPS_MARK_STAB ECOFF_MARK_STAB
 141 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
 142
 143 /********************** SYMBOLIC INFORMATION **********************/
 144
 145 /* Written by John Gilmore.  */
 146
 147 /* ECOFF uses COFF-like section structures, but its own symbol format.
 148    This file defines the symbol format in fields whose size and alignment
 149    will not vary on different host systems.  */
 150
 151 /* File header as a set of bytes */
 152
 153 struct hdr_ext
 154 {
 155         unsigned char   h_magic[2];
 156         unsigned char   h_vstamp[2];
 157         unsigned char   h_ilineMax[4];
 158         unsigned char   h_cbLine[4];
 159         unsigned char   h_cbLineOffset[4];
 160         unsigned char   h_idnMax[4];
 161         unsigned char   h_cbDnOffset[4];
 162         unsigned char   h_ipdMax[4];
 163         unsigned char   h_cbPdOffset[4];
 164         unsigned char   h_isymMax[4];
 165         unsigned char   h_cbSymOffset[4];
 166         unsigned char   h_ioptMax[4];
 167         unsigned char   h_cbOptOffset[4];
 168         unsigned char   h_iauxMax[4];
 169         unsigned char   h_cbAuxOffset[4];
 170         unsigned char   h_issMax[4];
 171         unsigned char   h_cbSsOffset[4];
 172         unsigned char   h_issExtMax[4];
 173         unsigned char   h_cbSsExtOffset[4];
 174         unsigned char   h_ifdMax[4];
 175         unsigned char   h_cbFdOffset[4];
 176         unsigned char   h_crfd[4];
 177         unsigned char   h_cbRfdOffset[4];
 178         unsigned char   h_iextMax[4];
 179         unsigned char   h_cbExtOffset[4];
 180 };
 181
 182 /* File descriptor external record */
 183
 184 struct fdr_ext
 185 {
 186         unsigned char   f_adr[4];
 187         unsigned char   f_rss[4];
 188         unsigned char   f_issBase[4];
 189         unsigned char   f_cbSs[4];
 190         unsigned char   f_isymBase[4];
 191         unsigned char   f_csym[4];
 192         unsigned char   f_ilineBase[4];
 193         unsigned char   f_cline[4];
 194         unsigned char   f_ioptBase[4];
 195         unsigned char   f_copt[4];
 196         unsigned char   f_ipdFirst[2];
 197         unsigned char   f_cpd[2];
 198         unsigned char   f_iauxBase[4];
 199         unsigned char   f_caux[4];
 200         unsigned char   f_rfdBase[4];
 201         unsigned char   f_crfd[4];
 202         unsigned char   f_bits1[1];
 203         unsigned char   f_bits2[3];
 204         unsigned char   f_cbLineOffset[4];
 205         unsigned char   f_cbLine[4];
 206 };
 207
 208 #define FDR_BITS1_LANG_BIG              0xF8
 209 #define FDR_BITS1_LANG_SH_BIG           3
 210 #define FDR_BITS1_LANG_LITTLE           0x1F
 211 #define FDR_BITS1_LANG_SH_LITTLE        0
 212
 213 #define FDR_BITS1_FMERGE_BIG            0x04
 214 #define FDR_BITS1_FMERGE_LITTLE         0x20
 215
 216 #define FDR_BITS1_FREADIN_BIG           0x02
 217 #define FDR_BITS1_FREADIN_LITTLE        0x40
 218
 219 #define FDR_BITS1_FBIGENDIAN_BIG        0x01
 220 #define FDR_BITS1_FBIGENDIAN_LITTLE     0x80
 221
 222 #define FDR_BITS2_GLEVEL_BIG            0xC0
 223 #define FDR_BITS2_GLEVEL_SH_BIG         6
 224 #define FDR_BITS2_GLEVEL_LITTLE         0x03
 225 #define FDR_BITS2_GLEVEL_SH_LITTLE      0
 226
 227 /* We ignore the `reserved' field in bits2. */
 228
 229 /* Procedure descriptor external record */
 230
 231 struct pdr_ext
 232 {
 233         unsigned char   p_adr[4];
 234         unsigned char   p_isym[4];
 235         unsigned char   p_iline[4];
 236         unsigned char   p_regmask[4];
 237         unsigned char   p_regoffset[4];
 238         unsigned char   p_iopt[4];
 239         unsigned char   p_fregmask[4];
 240         unsigned char   p_fregoffset[4];
 241         unsigned char   p_frameoffset[4];
 242         unsigned char   p_framereg[2];
 243         unsigned char   p_pcreg[2];
 244         unsigned char   p_lnLow[4];
 245         unsigned char   p_lnHigh[4];
 246         unsigned char   p_cbLineOffset[4];
 247 };
 248
 249 /* Runtime procedure table */
 250
 251 struct rpdr_ext
 252 {
 253         unsigned char   p_adr[4];
 254         unsigned char   p_regmask[4];
 255         unsigned char   p_regoffset[4];
 256         unsigned char   p_fregmask[4];
 257         unsigned char   p_fregoffset[4];
 258         unsigned char   p_frameoffset[4];
 259         unsigned char   p_framereg[2];
 260         unsigned char   p_pcreg[2];
 261         unsigned char   p_irpss[4];
 262         unsigned char   p_reserved[4];
 263         unsigned char   p_exception_info[4];
 264 };
 265
 266 /* Line numbers */
 267
 268 struct line_ext
 269 {
 270         unsigned char   l_line[4];
 271 };
 272
 273 /* Symbol external record */
 274
 275 struct sym_ext
 276 {
 277         unsigned char   s_iss[4];
 278         unsigned char   s_value[4];
 279         unsigned char   s_bits1[1];
 280         unsigned char   s_bits2[1];
 281         unsigned char   s_bits3[1];
 282         unsigned char   s_bits4[1];
 283 };
 284
 285 #define SYM_BITS1_ST_BIG                0xFC
 286 #define SYM_BITS1_ST_SH_BIG             2
 287 #define SYM_BITS1_ST_LITTLE             0x3F
 288 #define SYM_BITS1_ST_SH_LITTLE          0
 289
 290 #define SYM_BITS1_SC_BIG                0x03
 291 #define SYM_BITS1_SC_SH_LEFT_BIG        3
 292 #define SYM_BITS1_SC_LITTLE             0xC0
 293 #define SYM_BITS1_SC_SH_LITTLE          6
 294
 295 #define SYM_BITS2_SC_BIG                0xE0
 296 #define SYM_BITS2_SC_SH_BIG             5
 297 #define SYM_BITS2_SC_LITTLE             0x07
 298 #define SYM_BITS2_SC_SH_LEFT_LITTLE     2
 299
 300 #define SYM_BITS2_RESERVED_BIG          0x10
 301 #define SYM_BITS2_RESERVED_LITTLE       0x08
 302
 303 #define SYM_BITS2_INDEX_BIG             0x0F
 304 #define SYM_BITS2_INDEX_SH_LEFT_BIG     16
 305 #define SYM_BITS2_INDEX_LITTLE          0xF0
 306 #define SYM_BITS2_INDEX_SH_LITTLE       4
 307
 308 #define SYM_BITS3_INDEX_SH_LEFT_BIG     8
 309 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4
 310
 311 #define SYM_BITS4_INDEX_SH_LEFT_BIG     0
 312 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12
 313
 314 /* External symbol external record */
 315
 316 struct ext_ext
 317 {
 318         unsigned char   es_bits1[1];
 319         unsigned char   es_bits2[1];
 320         unsigned char   es_ifd[2];
 321         struct  sym_ext es_asym;
 322 };
 323
 324 #define EXT_BITS1_JMPTBL_BIG            0x80
 325 #define EXT_BITS1_JMPTBL_LITTLE         0x01
 326
 327 #define EXT_BITS1_COBOL_MAIN_BIG        0x40
 328 #define EXT_BITS1_COBOL_MAIN_LITTLE     0x02
 329
 330 #define EXT_BITS1_WEAKEXT_BIG           0x20
 331 #define EXT_BITS1_WEAKEXT_LITTLE        0x04
 332
 333 /* Dense numbers external record */
 334
 335 struct dnr_ext
 336 {
 337         unsigned char   d_rfd[4];
 338         unsigned char   d_index[4];
 339 };
 340
 341 /* Relative file descriptor */
 342
 343 struct rfd_ext
 344 {
 345   unsigned char rfd[4];
 346 };
 347
 348 /* Optimizer symbol external record */
 349
 350 struct opt_ext
 351 {
 352   unsigned char o_bits1[1];
 353   unsigned char o_bits2[1];
 354   unsigned char o_bits3[1];
 355   unsigned char o_bits4[1];
 356   struct rndx_ext o_rndx;
 357   unsigned char o_offset[4];
 358 };
 359
 360 #define OPT_BITS2_VALUE_SH_LEFT_BIG     16
 361 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0
 362
 363 #define OPT_BITS3_VALUE_SH_LEFT_BIG     8
 364 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8
 365
 366 #define OPT_BITS4_VALUE_SH_LEFT_BIG     0
 367 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16