include/coff/ecoff.h

   1 /* Generic ECOFF support.
   2    This does not include symbol information, found in sym.h and
   3    symconst.h.
   4
   5    Copyright (C) 2001-2017 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #ifndef ECOFF_H
  23 #define ECOFF_H
  24
  25 /* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on
  26    little endian machines.  MIPS_MAGIC_BIG is used on big endian
  27    machines.  Where is MIPS_MAGIC_1 from?  */
  28 #define MIPS_MAGIC_1 0x0180
  29 #define MIPS_MAGIC_LITTLE 0x0162
  30 #define MIPS_MAGIC_BIG 0x0160
  31
  32 /* These are the magic numbers used for MIPS code compiled at ISA
  33    level 2.  */
  34 #define MIPS_MAGIC_LITTLE2 0x0166
  35 #define MIPS_MAGIC_BIG2 0x0163
  36
  37 /* These are the magic numbers used for MIPS code compiled at ISA
  38    level 3.  */
  39 #define MIPS_MAGIC_LITTLE3 0x142
  40 #define MIPS_MAGIC_BIG3 0x140
  41
  42 /* Alpha magic numbers used in filehdr.  */
  43 #define ALPHA_MAGIC 0x183
  44 #define ALPHA_MAGIC_BSD 0x185
  45 /* A compressed version of an ALPHA_MAGIC file created by DEC's tools.  */
  46 #define ALPHA_MAGIC_COMPRESSED 0x188
  47
  48 /* Magic numbers used in a.out header.  */
  49 #define ECOFF_AOUT_OMAGIC 0407  /* not demand paged (ld -N).  */
  50 #define ECOFF_AOUT_ZMAGIC 0413  /* demand load format, eg normal ld output */
  51
  52 /* Names of special sections.  */
  53 #define _TEXT   ".text"
  54 #define _DATA   ".data"
  55 #define _BSS    ".bss"
  56 #define _RDATA  ".rdata"
  57 #define _SDATA  ".sdata"
  58 #define _SBSS   ".sbss"
  59 #define _LITA   ".lita"
  60 #define _LIT4   ".lit4"
  61 #define _LIT8   ".lit8"
  62 #define _LIB    ".lib"
  63 #define _INIT   ".init"
  64 #define _FINI   ".fini"
  65 #define _PDATA  ".pdata"
  66 #define _XDATA  ".xdata"
  67 #define _GOT    ".got"
  68 #define _HASH   ".hash"
  69 #define _DYNSYM ".dynsym"
  70 #define _DYNSTR ".dynstr"
  71 #define _RELDYN ".rel.dyn"
  72 #define _CONFLIC ".conflic"
  73 #define _COMMENT ".comment"
  74 #define _LIBLIST ".liblist"
  75 #define _DYNAMIC ".dynamic"
  76 #define _RCONST ".rconst"
  77
  78 /* ECOFF uses some additional section flags.  */
  79 #define STYP_RDATA           0x100
  80 #define STYP_SDATA           0x200
  81 #define STYP_SBSS            0x400
  82 #define STYP_GOT            0x1000
  83 #define STYP_DYNAMIC        0x2000
  84 #define STYP_DYNSYM         0x4000
  85 #define STYP_RELDYN         0x8000
  86 #define STYP_DYNSTR        0x10000
  87 #define STYP_HASH          0x20000
  88 #define STYP_LIBLIST       0x40000
  89 #define STYP_CONFLIC      0x100000
  90 #define STYP_ECOFF_FINI  0x1000000
  91 #define STYP_EXTENDESC   0x2000000 /* 0x02FFF000 bits => scn type, rest clr */
  92 #define STYP_LITA        0x4000000
  93 #define STYP_LIT8        0x8000000
  94 #define STYP_LIT4       0x10000000
  95 #define STYP_ECOFF_LIB  0x40000000
  96 #define STYP_ECOFF_INIT 0x80000000
  97 #define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI)
  98
  99 /* extended section types */
 100 #define STYP_COMMENT     0x2100000
 101 #define STYP_RCONST      0x2200000
 102 #define STYP_XDATA       0x2400000
 103 #define STYP_PDATA       0x2800000
 104
 105 /* The linker needs a section to hold small common variables while
 106    linking.  There is no convenient way to create it when the linker
 107    needs it, so we always create one for each BFD.  We then avoid
 108    writing it out.  */
 109 #define SCOMMON ".scommon"
 110
 111 /* If the extern bit in a reloc is 1, then r_symndx is an index into
 112    the external symbol table.  If the extern bit is 0, then r_symndx
 113    indicates a section, and is one of the following values.  */
 114 #define RELOC_SECTION_NONE      0
 115 #define RELOC_SECTION_TEXT      1
 116 #define RELOC_SECTION_RDATA     2
 117 #define RELOC_SECTION_DATA      3
 118 #define RELOC_SECTION_SDATA     4
 119 #define RELOC_SECTION_SBSS      5
 120 #define RELOC_SECTION_BSS       6
 121 #define RELOC_SECTION_INIT      7
 122 #define RELOC_SECTION_LIT8      8
 123 #define RELOC_SECTION_LIT4      9
 124 #define RELOC_SECTION_XDATA    10
 125 #define RELOC_SECTION_PDATA    11
 126 #define RELOC_SECTION_FINI     12
 127 #define RELOC_SECTION_LITA     13
 128 #define RELOC_SECTION_ABS      14
 129 #define RELOC_SECTION_RCONST   15
 130
 131 #define NUM_RELOC_SECTIONS     16
 132
 133 /********************** STABS **********************/
 134
 135 /* gcc uses mips-tfile to output type information in special stabs
 136    entries.  These must match the corresponding definition in
 137    gcc/config/mips.h.  At some point, these should probably go into a
 138    shared include file, but currently gcc and gdb do not share any
 139    directories. */
 140 #define CODE_MASK 0x8F300
 141 #define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
 142 #define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)
 143 #define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)
 144 #define STABS_SYMBOL "@stabs"
 145
 146 /********************** COFF **********************/
 147
 148 /* gcc also uses mips-tfile to output COFF debugging information.
 149    These are the values it uses when outputting the .type directive.
 150    These should also be in a shared include file.  */
 151 #define N_BTMASK        (017)
 152 #define N_TMASK         (060)
 153 #define N_BTSHFT        (4)
 154 #define N_TSHIFT        (2)
 155
 156 /********************** AUX **********************/
 157
 158 /* The auxiliary type information is the same on all known ECOFF
 159    targets.  I can't see any reason that it would ever change, so I am
 160    going to gamble and define the external structures here, in the
 161    target independent ECOFF header file.  The internal forms are
 162    defined in coff/sym.h, which was originally donated by MIPS
 163    Computer Systems.  */
 164
 165 /* Type information external record */
 166
 167 struct tir_ext {
 168         unsigned char   t_bits1[1];
 169         unsigned char   t_tq45[1];
 170         unsigned char   t_tq01[1];
 171         unsigned char   t_tq23[1];
 172 };
 173
 174 #define TIR_BITS1_FBITFIELD_BIG         ((unsigned int) 0x80)
 175 #define TIR_BITS1_FBITFIELD_LITTLE      ((unsigned int) 0x01)
 176
 177 #define TIR_BITS1_CONTINUED_BIG         ((unsigned int) 0x40)
 178 #define TIR_BITS1_CONTINUED_LITTLE      ((unsigned int) 0x02)
 179
 180 #define TIR_BITS1_BT_BIG                ((unsigned int) 0x3F)
 181 #define TIR_BITS1_BT_SH_BIG             0
 182 #define TIR_BITS1_BT_LITTLE             ((unsigned int) 0xFC)
 183 #define TIR_BITS1_BT_SH_LITTLE          2
 184
 185 #define TIR_BITS_TQ4_BIG                ((unsigned int) 0xF0)
 186 #define TIR_BITS_TQ4_SH_BIG             4
 187 #define TIR_BITS_TQ5_BIG                ((unsigned int) 0x0F)
 188 #define TIR_BITS_TQ5_SH_BIG             0
 189 #define TIR_BITS_TQ4_LITTLE             ((unsigned int) 0x0F)
 190 #define TIR_BITS_TQ4_SH_LITTLE          0
 191 #define TIR_BITS_TQ5_LITTLE             ((unsigned int) 0xF0)
 192 #define TIR_BITS_TQ5_SH_LITTLE          4
 193
 194 #define TIR_BITS_TQ0_BIG                ((unsigned int) 0xF0)
 195 #define TIR_BITS_TQ0_SH_BIG             4
 196 #define TIR_BITS_TQ1_BIG                ((unsigned int) 0x0F)
 197 #define TIR_BITS_TQ1_SH_BIG             0
 198 #define TIR_BITS_TQ0_LITTLE             ((unsigned int) 0x0F)
 199 #define TIR_BITS_TQ0_SH_LITTLE          0
 200 #define TIR_BITS_TQ1_LITTLE             ((unsigned int) 0xF0)
 201 #define TIR_BITS_TQ1_SH_LITTLE          4
 202
 203 #define TIR_BITS_TQ2_BIG                ((unsigned int) 0xF0)
 204 #define TIR_BITS_TQ2_SH_BIG             4
 205 #define TIR_BITS_TQ3_BIG                ((unsigned int) 0x0F)
 206 #define TIR_BITS_TQ3_SH_BIG             0
 207 #define TIR_BITS_TQ2_LITTLE             ((unsigned int) 0x0F)
 208 #define TIR_BITS_TQ2_SH_LITTLE          0
 209 #define TIR_BITS_TQ3_LITTLE             ((unsigned int) 0xF0)
 210 #define TIR_BITS_TQ3_SH_LITTLE          4
 211
 212 /* Relative symbol external record */
 213
 214 struct rndx_ext {
 215         unsigned char   r_bits[4];
 216 };
 217
 218 #define RNDX_BITS0_RFD_SH_LEFT_BIG      4
 219 #define RNDX_BITS1_RFD_BIG              ((unsigned int) 0xF0)
 220 #define RNDX_BITS1_RFD_SH_BIG           4
 221
 222 #define RNDX_BITS0_RFD_SH_LEFT_LITTLE   0
 223 #define RNDX_BITS1_RFD_LITTLE           ((unsigned int) 0x0F)
 224 #define RNDX_BITS1_RFD_SH_LEFT_LITTLE   8
 225
 226 #define RNDX_BITS1_INDEX_BIG            ((unsigned int) 0x0F)
 227 #define RNDX_BITS1_INDEX_SH_LEFT_BIG    16
 228 #define RNDX_BITS2_INDEX_SH_LEFT_BIG    8
 229 #define RNDX_BITS3_INDEX_SH_LEFT_BIG    0
 230
 231 #define RNDX_BITS1_INDEX_LITTLE         ((unsigned int) 0xF0)
 232 #define RNDX_BITS1_INDEX_SH_LITTLE      4
 233 #define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4
 234 #define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12
 235
 236 /* Auxiliary symbol information external record */
 237
 238 union aux_ext {
 239         struct tir_ext  a_ti;
 240         struct rndx_ext a_rndx;
 241         unsigned char   a_dnLow[4];
 242         unsigned char   a_dnHigh[4];
 243         unsigned char   a_isym[4];
 244         unsigned char   a_iss[4];
 245         unsigned char   a_width[4];
 246         unsigned char   a_count[4];
 247 };
 248
 249 #define AUX_GET_ANY(bigend, ax, field) \
 250   ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))
 251
 252 #define AUX_GET_DNLOW(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_dnLow)
 253 #define AUX_GET_DNHIGH(bigend, ax)      AUX_GET_ANY ((bigend), (ax), a_dnHigh)
 254 #define AUX_GET_ISYM(bigend, ax)        AUX_GET_ANY ((bigend), (ax), a_isym)
 255 #define AUX_GET_ISS(bigend, ax)         AUX_GET_ANY ((bigend), (ax), a_iss)
 256 #define AUX_GET_WIDTH(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_width)
 257 #define AUX_GET_COUNT(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_count)
 258
 259 #define AUX_PUT_ANY(bigend, val, ax, field) \
 260   ((bigend) \
 261    ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \
 262    : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0))
 263
 264 #define AUX_PUT_DNLOW(bigend, val, ax) \
 265   AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)
 266 #define AUX_PUT_DNHIGH(bigend, val, ax) \
 267   AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)
 268 #define AUX_PUT_ISYM(bigend, val, ax) \
 269   AUX_PUT_ANY ((bigend), (val), (ax), a_isym)
 270 #define AUX_PUT_ISS(bigend, val, ax) \
 271   AUX_PUT_ANY ((bigend), (val), (ax), a_iss)
 272 #define AUX_PUT_WIDTH(bigend, val, ax) \
 273   AUX_PUT_ANY ((bigend), (val), (ax), a_width)
 274 #define AUX_PUT_COUNT(bigend, val, ax) \
 275   AUX_PUT_ANY ((bigend), (val), (ax), a_count)
 276
 277 /********************** SYMBOLS **********************/
 278
 279 /* For efficiency, gdb deals directly with the unswapped symbolic
 280    information (that way it only takes the time to swap information
 281    that it really needs to read).  gdb originally retrieved the
 282    information directly from the BFD backend information, but that
 283    strategy, besides being sort of ugly, does not work for MIPS ELF,
 284    which also uses ECOFF debugging information.  This structure holds
 285    pointers to the (mostly) unswapped symbolic information.  */
 286
 287 struct ecoff_debug_info
 288 {
 289   /* The swapped ECOFF symbolic header.  */
 290   HDRR symbolic_header;
 291
 292   /* Pointers to the unswapped symbolic information.  Note that the
 293      pointers to external structures point to different sorts of
 294      information on different ECOFF targets.  The ecoff_debug_swap
 295      structure provides the sizes of the structures and the functions
 296      needed to swap the information in and out.  These pointers are
 297      all pointers to arrays, not single structures.  They will be NULL
 298      if there are no instances of the relevant structure.  These
 299      fields are also used by the assembler to output ECOFF debugging
 300      information.  */
 301   unsigned char *line;
 302   void *external_dnr;   /* struct dnr_ext */
 303   void *external_pdr;   /* struct pdr_ext */
 304   void *external_sym;   /* struct sym_ext */
 305   void *external_opt;   /* struct opt_ext */
 306   union aux_ext *external_aux;
 307   char *ss;
 308   char *ssext;
 309   void *external_fdr;   /* struct fdr_ext */
 310   void *external_rfd;   /* struct rfd_ext */
 311   void *external_ext;   /* struct ext_ext */
 312
 313   /* These fields are used when linking.  They may disappear at some
 314      point.  */
 315   char *ssext_end;
 316   void *external_ext_end;
 317
 318   /* When linking, this field holds a mapping from the input FDR
 319      numbers to the output numbers, and is used when writing out the
 320      external symbols.  It is NULL if no mapping is required.  */
 321   RFDT *ifdmap;
 322
 323   /* The swapped FDR information.  Currently this is never NULL, but
 324      code using this structure should probably double-check in case
 325      this changes in the future.  This is a pointer to an array, not a
 326      single structure.  */
 327   FDR *fdr;
 328 };
 329
 330 /* These structures are used by the ECOFF find_nearest_line function.  */
 331
 332 struct ecoff_fdrtab_entry
 333 {
 334   /* Base address in .text of this FDR.  */
 335   bfd_vma base_addr;
 336   FDR *fdr;
 337 };
 338
 339 struct ecoff_find_line
 340 {
 341   /* Allocated memory to hold function and file names.  */
 342   char *find_buffer;
 343
 344   /* FDR table, sorted by address: */
 345   long fdrtab_len;
 346   struct ecoff_fdrtab_entry *fdrtab;
 347
 348   /* Cache entry for most recently found line information.  The sect
 349      field is NULL if this cache does not contain valid information.  */
 350   struct
 351     {
 352       asection *sect;
 353       bfd_vma start;
 354       bfd_vma stop;
 355       const char *filename;
 356       const char *functionname;
 357       unsigned int line_num;
 358     } cache;
 359 };
 360
 361 /********************** SWAPPING **********************/
 362
 363 /* The generic ECOFF code needs to be able to swap debugging
 364    information in and out in the specific format used by a particular
 365    ECOFF implementation.  This structure provides the information
 366    needed to do this.  */
 367
 368 struct ecoff_debug_swap
 369 {
 370   /* Symbol table magic number.  */
 371   int sym_magic;
 372   /* Alignment of debugging information.  E.g., 4.  */
 373   bfd_size_type debug_align;
 374   /* Sizes of external symbolic information.  */
 375   bfd_size_type external_hdr_size;
 376   bfd_size_type external_dnr_size;
 377   bfd_size_type external_pdr_size;
 378   bfd_size_type external_sym_size;
 379   bfd_size_type external_opt_size;
 380   bfd_size_type external_fdr_size;
 381   bfd_size_type external_rfd_size;
 382   bfd_size_type external_ext_size;
 383   /* Functions to swap in external symbolic data.  */
 384   void (*swap_hdr_in) (bfd *, void *, HDRR *);
 385   void (*swap_dnr_in) (bfd *, void *, DNR *);
 386   void (*swap_pdr_in) (bfd *, void *, PDR *);
 387   void (*swap_sym_in) (bfd *, void *, SYMR *);
 388   void (*swap_opt_in) (bfd *, void *, OPTR *);
 389   void (*swap_fdr_in) (bfd *, void *, FDR *);
 390   void (*swap_rfd_in) (bfd *, void *, RFDT *);
 391   void (*swap_ext_in) (bfd *, void *, EXTR *);
 392   void (*swap_tir_in) (int, const struct tir_ext *, TIR *);
 393   void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *);
 394   /* Functions to swap out external symbolic data.  */
 395   void (*swap_hdr_out) (bfd *, const HDRR *, void *);
 396   void (*swap_dnr_out) (bfd *, const DNR *, void *);
 397   void (*swap_pdr_out) (bfd *, const PDR *, void *);
 398   void (*swap_sym_out) (bfd *, const SYMR *, void *);
 399   void (*swap_opt_out) (bfd *, const OPTR *, void *);
 400   void (*swap_fdr_out) (bfd *, const FDR *, void *);
 401   void (*swap_rfd_out) (bfd *, const RFDT *, void *);
 402   void (*swap_ext_out) (bfd *, const EXTR *, void *);
 403   void (*swap_tir_out) (int, const TIR *, struct tir_ext *);
 404   void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *);
 405   /* Function to read symbol data and set up pointers in
 406      ecoff_debug_info structure.  The section argument is used for
 407      ELF, not straight ECOFF.  */
 408   bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *);
 409 };
 410
 411 #endif /* ! defined (ECOFF_H) */