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 (sizeof(AOUTHDR))
  50
  51 /********************** SECTION HEADER **********************/
  52
  53 struct external_scnhdr {
  54   unsigned char s_name[8];      /* section name                 */
  55   unsigned char s_paddr[4];     /* physical address, aliased s_nlib */
  56   unsigned char s_vaddr[4];     /* virtual address              */
  57   unsigned char s_size[4];      /* section size                 */
  58   unsigned char s_scnptr[4];    /* file ptr to raw data for section */
  59   unsigned char s_relptr[4];    /* file ptr to relocation       */
  60   unsigned char s_lnnoptr[4];   /* file ptr to line numbers     */
  61   unsigned char s_nreloc[2];    /* number of relocation entries */
  62   unsigned char s_nlnno[2];     /* number of line number entries*/
  63   unsigned char s_flags[4];     /* flags                        */
  64 };
  65
  66 #define SCNHDR  struct external_scnhdr
  67 #define SCNHSZ  sizeof(SCNHDR)
  68
  69 /********************** RELOCATION DIRECTIVES **********************/
  70
  71 struct external_reloc {
  72   unsigned char r_vaddr[4];
  73   unsigned char r_bits[4];
  74 };
  75
  76 #define RELOC struct external_reloc
  77 #define RELSZ 8
  78
  79 /* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
  80    are used to unpack the r_bits field.  */
  81
  82 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
  83 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0
  84
  85 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
  86 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8
  87
  88 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
  89 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16
  90
  91 #define RELOC_BITS3_TYPE_BIG                    0x1E
  92 #define RELOC_BITS3_TYPE_SH_BIG                 1
  93 #define RELOC_BITS3_TYPE_LITTLE                 0x78
  94 #define RELOC_BITS3_TYPE_SH_LITTLE              3
  95
  96 #define RELOC_BITS3_EXTERN_BIG                  0x01
  97 #define RELOC_BITS3_EXTERN_LITTLE               0x80
  98
  99 /* The r_type field in a reloc is one of the following values.  I
 100    don't know if any other values can appear.  These seem to be all
 101    that occur in the Ultrix 4.2 libraries.  */
 102 #define MIPS_R_IGNORE   0
 103 #define MIPS_R_REFHALF  1
 104 #define MIPS_R_REFWORD  2
 105 #define MIPS_R_JMPADDR  3
 106 #define MIPS_R_REFHI    4
 107 #define MIPS_R_REFLO    5
 108 #define MIPS_R_GPREL    6
 109 #define MIPS_R_LITERAL  7
 110
 111 /* This reloc type is a Cygnus extension used when generating position
 112    independent code for embedded systems.  */
 113 #define MIPS_R_PCREL16  8
 114
 115 /* This reloc type is a Cygnus extension used when generating position
 116    independent code for embedded systems.  It is used for an entry in
 117    a switch table, which looks like this:
 118      .switch $L3-$LS12
 119    The object file will contain the correct difference, and does not
 120    require adjustment.  However, when the linker is relaxing PC
 121    relative calls, it is possible for $L3 to move farther away.  This
 122    reloc always appears in the .text section, and is always against
 123    the .text section.  However, the symbol index is not
 124    RELOC_SECTION_TEXT.  It is, instead, the distance between this
 125    switch table entry and $LS12.  Thus, the original value of $L12 is
 126      vaddr - symndx
 127    and the original value of $L3 is
 128      vaddr - symndx + addend
 129    where addend is the value in the object file.  Knowing this, the
 130    linker can know whether the addend in the object file must be
 131    adjusted.  */
 132 #define MIPS_R_SWITCH   9
 133
 134 /********************** STABS **********************/
 135
 136 #define MIPS_IS_STAB ECOFF_IS_STAB
 137 #define MIPS_MARK_STAB ECOFF_MARK_STAB
 138 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
 139
 140 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
 141 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
 142 #define DEFAULT_TEXT_SECTION_ALIGNMENT 16
 143 /* For new sections we havn't heard of before */
 144 #define DEFAULT_SECTION_ALIGNMENT 4
 145
 146 /********************** SYMBOLIC INFORMATION **********************/
 147
 148 /* Written by John Gilmore.  */
 149
 150 /* ECOFF uses COFF-like section structures, but its own symbol format.
 151    This file defines the symbol format in fields whose size and alignment
 152    will not vary on different host systems.  */
 153
 154 /* File header as a set of bytes */
 155
 156 struct hdr_ext {
 157         unsigned char   h_magic[2];
 158         unsigned char   h_vstamp[2];
 159         unsigned char   h_ilineMax[4];
 160         unsigned char   h_cbLine[4];
 161         unsigned char   h_cbLineOffset[4];
 162         unsigned char   h_idnMax[4];
 163         unsigned char   h_cbDnOffset[4];
 164         unsigned char   h_ipdMax[4];
 165         unsigned char   h_cbPdOffset[4];
 166         unsigned char   h_isymMax[4];
 167         unsigned char   h_cbSymOffset[4];
 168         unsigned char   h_ioptMax[4];
 169         unsigned char   h_cbOptOffset[4];
 170         unsigned char   h_iauxMax[4];
 171         unsigned char   h_cbAuxOffset[4];
 172         unsigned char   h_issMax[4];
 173         unsigned char   h_cbSsOffset[4];
 174         unsigned char   h_issExtMax[4];
 175         unsigned char   h_cbSsExtOffset[4];
 176         unsigned char   h_ifdMax[4];
 177         unsigned char   h_cbFdOffset[4];
 178         unsigned char   h_crfd[4];
 179         unsigned char   h_cbRfdOffset[4];
 180         unsigned char   h_iextMax[4];
 181         unsigned char   h_cbExtOffset[4];
 182 };
 183
 184 /* File descriptor external record */
 185
 186 struct fdr_ext {
 187         unsigned char   f_adr[4];
 188         unsigned char   f_rss[4];
 189         unsigned char   f_issBase[4];
 190         unsigned char   f_cbSs[4];
 191         unsigned char   f_isymBase[4];
 192         unsigned char   f_csym[4];
 193         unsigned char   f_ilineBase[4];
 194         unsigned char   f_cline[4];
 195         unsigned char   f_ioptBase[4];
 196         unsigned char   f_copt[4];
 197         unsigned char   f_ipdFirst[2];
 198         unsigned char   f_cpd[2];
 199         unsigned char   f_iauxBase[4];
 200         unsigned char   f_caux[4];
 201         unsigned char   f_rfdBase[4];
 202         unsigned char   f_crfd[4];
 203         unsigned char   f_bits1[1];
 204         unsigned char   f_bits2[3];
 205         unsigned char   f_cbLineOffset[4];
 206         unsigned char   f_cbLine[4];
 207 };
 208
 209 #define FDR_BITS1_LANG_BIG              0xF8
 210 #define FDR_BITS1_LANG_SH_BIG           3
 211 #define FDR_BITS1_LANG_LITTLE           0x1F
 212 #define FDR_BITS1_LANG_SH_LITTLE        0
 213
 214 #define FDR_BITS1_FMERGE_BIG            0x04
 215 #define FDR_BITS1_FMERGE_LITTLE         0x20
 216
 217 #define FDR_BITS1_FREADIN_BIG           0x02
 218 #define FDR_BITS1_FREADIN_LITTLE        0x40
 219
 220 #define FDR_BITS1_FBIGENDIAN_BIG        0x01
 221 #define FDR_BITS1_FBIGENDIAN_LITTLE     0x80
 222
 223 #define FDR_BITS2_GLEVEL_BIG            0xC0
 224 #define FDR_BITS2_GLEVEL_SH_BIG         6
 225 #define FDR_BITS2_GLEVEL_LITTLE         0x03
 226 #define FDR_BITS2_GLEVEL_SH_LITTLE      0
 227
 228 /* We ignore the `reserved' field in bits2. */
 229
 230 /* Procedure descriptor external record */
 231
 232 struct pdr_ext {
 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 /* Line numbers */
 250
 251 struct line_ext {
 252         unsigned char   l_line[4];
 253 };
 254
 255 /* Symbol external record */
 256
 257 struct sym_ext {
 258         unsigned char   s_iss[4];
 259         unsigned char   s_value[4];
 260         unsigned char   s_bits1[1];
 261         unsigned char   s_bits2[1];
 262         unsigned char   s_bits3[1];
 263         unsigned char   s_bits4[1];
 264 };
 265
 266 #define SYM_BITS1_ST_BIG                0xFC
 267 #define SYM_BITS1_ST_SH_BIG             2
 268 #define SYM_BITS1_ST_LITTLE             0x3F
 269 #define SYM_BITS1_ST_SH_LITTLE          0
 270
 271 #define SYM_BITS1_SC_BIG                0x03
 272 #define SYM_BITS1_SC_SH_LEFT_BIG        3
 273 #define SYM_BITS1_SC_LITTLE             0xC0
 274 #define SYM_BITS1_SC_SH_LITTLE          6
 275
 276 #define SYM_BITS2_SC_BIG                0xE0
 277 #define SYM_BITS2_SC_SH_BIG             5
 278 #define SYM_BITS2_SC_LITTLE             0x07
 279 #define SYM_BITS2_SC_SH_LEFT_LITTLE     2
 280
 281 #define SYM_BITS2_RESERVED_BIG          0x10
 282 #define SYM_BITS2_RESERVED_LITTLE       0x08
 283
 284 #define SYM_BITS2_INDEX_BIG             0x0F
 285 #define SYM_BITS2_INDEX_SH_LEFT_BIG     16
 286 #define SYM_BITS2_INDEX_LITTLE          0xF0
 287 #define SYM_BITS2_INDEX_SH_LITTLE       4
 288
 289 #define SYM_BITS3_INDEX_SH_LEFT_BIG     8
 290 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4
 291
 292 #define SYM_BITS4_INDEX_SH_LEFT_BIG     0
 293 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12
 294
 295 /* External symbol external record */
 296
 297 struct ext_ext {
 298         unsigned char   es_bits1[1];
 299         unsigned char   es_bits2[1];
 300         unsigned char   es_ifd[2];
 301         struct  sym_ext es_asym;
 302 };
 303
 304 #define EXT_BITS1_JMPTBL_BIG            0x80
 305 #define EXT_BITS1_JMPTBL_LITTLE         0x01
 306
 307 #define EXT_BITS1_COBOL_MAIN_BIG        0x40
 308 #define EXT_BITS1_COBOL_MAIN_LITTLE     0x02
 309
 310 #define EXT_BITS1_WEAKEXT_BIG           0x20
 311 #define EXT_BITS1_WEAKEXT_LITTLE        0x04
 312
 313 /* Dense numbers external record */
 314
 315 struct dnr_ext {
 316         unsigned char   d_rfd[4];
 317         unsigned char   d_index[4];
 318 };
 319
 320 /* Relative file descriptor */
 321
 322 struct rfd_ext {
 323   unsigned char rfd[4];
 324 };
 325
 326 /* Optimizer symbol external record */
 327
 328 struct opt_ext {
 329   unsigned char o_bits1[1];
 330   unsigned char o_bits2[1];
 331   unsigned char o_bits3[1];
 332   unsigned char o_bits4[1];
 333   struct rndx_ext o_rndx;
 334   unsigned char o_offset[4];
 335 };
 336
 337 #define OPT_BITS2_VALUE_SH_LEFT_BIG     16
 338 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0
 339
 340 #define OPT_BITS3_VALUE_SH_LEFT_BIG     8
 341 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8
 342
 343 #define OPT_BITS4_VALUE_SH_LEFT_BIG     0
 344 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16