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) 2001-2021 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 #include "coff/sym.h"
  26
  27 /* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on
  28    little endian machines.  MIPS_MAGIC_BIG is used on big endian
  29    machines.  Where is MIPS_MAGIC_1 from?  */
  30 #define MIPS_MAGIC_1 0x0180
  31 #define MIPS_MAGIC_LITTLE 0x0162
  32 #define MIPS_MAGIC_BIG 0x0160
  33
  34 /* These are the magic numbers used for MIPS code compiled at ISA
  35    level 2.  */
  36 #define MIPS_MAGIC_LITTLE2 0x0166
  37 #define MIPS_MAGIC_BIG2 0x0163
  38
  39 /* These are the magic numbers used for MIPS code compiled at ISA
  40    level 3.  */
  41 #define MIPS_MAGIC_LITTLE3 0x142
  42 #define MIPS_MAGIC_BIG3 0x140
  43
  44 /* Alpha magic numbers used in filehdr.  */
  45 #define ALPHA_MAGIC 0x183
  46 #define ALPHA_MAGIC_BSD 0x185
  47 /* A compressed version of an ALPHA_MAGIC file created by DEC's tools.  */
  48 #define ALPHA_MAGIC_COMPRESSED 0x188
  49
  50 /* Magic numbers used in a.out header.  */
  51 #define ECOFF_AOUT_OMAGIC 0407  /* not demand paged (ld -N).  */
  52 #define ECOFF_AOUT_ZMAGIC 0413  /* demand load format, eg normal ld output */
  53
  54 /* Names of special sections.  */
  55 #define _TEXT   ".text"
  56 #define _DATA   ".data"
  57 #define _BSS    ".bss"
  58 #define _RDATA  ".rdata"
  59 #define _SDATA  ".sdata"
  60 #define _SBSS   ".sbss"
  61 #define _LITA   ".lita"
  62 #define _LIT4   ".lit4"
  63 #define _LIT8   ".lit8"
  64 #define _LIB    ".lib"
  65 #define _INIT   ".init"
  66 #define _FINI   ".fini"
  67 #define _PDATA  ".pdata"
  68 #define _XDATA  ".xdata"
  69 #define _GOT    ".got"
  70 #define _HASH   ".hash"
  71 #define _DYNSYM ".dynsym"
  72 #define _DYNSTR ".dynstr"
  73 #define _RELDYN ".rel.dyn"
  74 #define _CONFLIC ".conflic"
  75 #define _COMMENT ".comment"
  76 #define _LIBLIST ".liblist"
  77 #define _DYNAMIC ".dynamic"
  78 #define _RCONST ".rconst"
  79
  80 /* ECOFF uses some additional section flags.  */
  81 #define STYP_RDATA           0x100
  82 #define STYP_SDATA           0x200
  83 #define STYP_SBSS            0x400
  84 #define STYP_GOT            0x1000
  85 #define STYP_DYNAMIC        0x2000
  86 #define STYP_DYNSYM         0x4000
  87 #define STYP_RELDYN         0x8000
  88 #define STYP_DYNSTR        0x10000
  89 #define STYP_HASH          0x20000
  90 #define STYP_LIBLIST       0x40000
  91 #define STYP_CONFLIC      0x100000
  92 #define STYP_ECOFF_FINI  0x1000000
  93 #define STYP_EXTENDESC   0x2000000 /* 0x02FFF000 bits => scn type, rest clr */
  94 #define STYP_LITA        0x4000000
  95 #define STYP_LIT8        0x8000000
  96 #define STYP_LIT4       0x10000000
  97 #define STYP_ECOFF_LIB  0x40000000
  98 #define STYP_ECOFF_INIT 0x80000000
  99 #define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI)
 100
 101 /* extended section types */
 102 #define STYP_COMMENT     0x2100000
 103 #define STYP_RCONST      0x2200000
 104 #define STYP_XDATA       0x2400000
 105 #define STYP_PDATA       0x2800000
 106
 107 /* The linker needs a section to hold small common variables while
 108    linking.  There is no convenient way to create it when the linker
 109    needs it, so we always create one for each BFD.  We then avoid
 110    writing it out.  */
 111 #define SCOMMON ".scommon"
 112
 113 /* If the extern bit in a reloc is 1, then r_symndx is an index into
 114    the external symbol table.  If the extern bit is 0, then r_symndx
 115    indicates a section, and is one of the following values.  */
 116 #define RELOC_SECTION_NONE      0
 117 #define RELOC_SECTION_TEXT      1
 118 #define RELOC_SECTION_RDATA     2
 119 #define RELOC_SECTION_DATA      3
 120 #define RELOC_SECTION_SDATA     4
 121 #define RELOC_SECTION_SBSS      5
 122 #define RELOC_SECTION_BSS       6
 123 #define RELOC_SECTION_INIT      7
 124 #define RELOC_SECTION_LIT8      8
 125 #define RELOC_SECTION_LIT4      9
 126 #define RELOC_SECTION_XDATA    10
 127 #define RELOC_SECTION_PDATA    11
 128 #define RELOC_SECTION_FINI     12
 129 #define RELOC_SECTION_LITA     13
 130 #define RELOC_SECTION_ABS      14
 131 #define RELOC_SECTION_RCONST   15
 132
 133 #define NUM_RELOC_SECTIONS     16
 134
 135 /********************** STABS **********************/
 136
 137 /* gcc uses mips-tfile to output type information in special stabs
 138    entries.  These must match the corresponding definition in
 139    gcc/config/mips.h.  At some point, these should probably go into a
 140    shared include file, but currently gcc and gdb do not share any
 141    directories. */
 142 #define CODE_MASK 0x8F300
 143 #define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
 144 #define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)
 145 #define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)
 146 #define STABS_SYMBOL "@stabs"
 147
 148 /********************** COFF **********************/
 149
 150 /* gcc also uses mips-tfile to output COFF debugging information.
 151    These are the values it uses when outputting the .type directive.
 152    These should also be in a shared include file.  */
 153 #define N_BTMASK        (017)
 154 #define N_TMASK         (060)
 155 #define N_BTSHFT        (4)
 156 #define N_TSHIFT        (2)
 157
 158 /********************** AUX **********************/
 159
 160 /* The auxiliary type information is the same on all known ECOFF
 161    targets.  I can't see any reason that it would ever change, so I am
 162    going to gamble and define the external structures here, in the
 163    target independent ECOFF header file.  The internal forms are
 164    defined in coff/sym.h, which was originally donated by MIPS
 165    Computer Systems.  */
 166
 167 /* Type information external record */
 168
 169 struct tir_ext {
 170         unsigned char   t_bits1[1];
 171         unsigned char   t_tq45[1];
 172         unsigned char   t_tq01[1];
 173         unsigned char   t_tq23[1];
 174 };
 175
 176 #define TIR_BITS1_FBITFIELD_BIG         ((unsigned int) 0x80)
 177 #define TIR_BITS1_FBITFIELD_LITTLE      ((unsigned int) 0x01)
 178
 179 #define TIR_BITS1_CONTINUED_BIG         ((unsigned int) 0x40)
 180 #define TIR_BITS1_CONTINUED_LITTLE      ((unsigned int) 0x02)
 181
 182 #define TIR_BITS1_BT_BIG                ((unsigned int) 0x3F)
 183 #define TIR_BITS1_BT_SH_BIG             0
 184 #define TIR_BITS1_BT_LITTLE             ((unsigned int) 0xFC)
 185 #define TIR_BITS1_BT_SH_LITTLE          2
 186
 187 #define TIR_BITS_TQ4_BIG                ((unsigned int) 0xF0)
 188 #define TIR_BITS_TQ4_SH_BIG             4
 189 #define TIR_BITS_TQ5_BIG                ((unsigned int) 0x0F)
 190 #define TIR_BITS_TQ5_SH_BIG             0
 191 #define TIR_BITS_TQ4_LITTLE             ((unsigned int) 0x0F)
 192 #define TIR_BITS_TQ4_SH_LITTLE          0
 193 #define TIR_BITS_TQ5_LITTLE             ((unsigned int) 0xF0)
 194 #define TIR_BITS_TQ5_SH_LITTLE          4
 195
 196 #define TIR_BITS_TQ0_BIG                ((unsigned int) 0xF0)
 197 #define TIR_BITS_TQ0_SH_BIG             4
 198 #define TIR_BITS_TQ1_BIG                ((unsigned int) 0x0F)
 199 #define TIR_BITS_TQ1_SH_BIG             0
 200 #define TIR_BITS_TQ0_LITTLE             ((unsigned int) 0x0F)
 201 #define TIR_BITS_TQ0_SH_LITTLE          0
 202 #define TIR_BITS_TQ1_LITTLE             ((unsigned int) 0xF0)
 203 #define TIR_BITS_TQ1_SH_LITTLE          4
 204
 205 #define TIR_BITS_TQ2_BIG                ((unsigned int) 0xF0)
 206 #define TIR_BITS_TQ2_SH_BIG             4
 207 #define TIR_BITS_TQ3_BIG                ((unsigned int) 0x0F)
 208 #define TIR_BITS_TQ3_SH_BIG             0
 209 #define TIR_BITS_TQ2_LITTLE             ((unsigned int) 0x0F)
 210 #define TIR_BITS_TQ2_SH_LITTLE          0
 211 #define TIR_BITS_TQ3_LITTLE             ((unsigned int) 0xF0)
 212 #define TIR_BITS_TQ3_SH_LITTLE          4
 213
 214 /* Relative symbol external record */
 215
 216 struct rndx_ext {
 217         unsigned char   r_bits[4];
 218 };
 219
 220 #define RNDX_BITS0_RFD_SH_LEFT_BIG      4
 221 #define RNDX_BITS1_RFD_BIG              ((unsigned int) 0xF0)
 222 #define RNDX_BITS1_RFD_SH_BIG           4
 223
 224 #define RNDX_BITS0_RFD_SH_LEFT_LITTLE   0
 225 #define RNDX_BITS1_RFD_LITTLE           ((unsigned int) 0x0F)
 226 #define RNDX_BITS1_RFD_SH_LEFT_LITTLE   8
 227
 228 #define RNDX_BITS1_INDEX_BIG            ((unsigned int) 0x0F)
 229 #define RNDX_BITS1_INDEX_SH_LEFT_BIG    16
 230 #define RNDX_BITS2_INDEX_SH_LEFT_BIG    8
 231 #define RNDX_BITS3_INDEX_SH_LEFT_BIG    0
 232
 233 #define RNDX_BITS1_INDEX_LITTLE         ((unsigned int) 0xF0)
 234 #define RNDX_BITS1_INDEX_SH_LITTLE      4
 235 #define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4
 236 #define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12
 237
 238 /* Auxiliary symbol information external record */
 239
 240 union aux_ext {
 241         struct tir_ext  a_ti;
 242         struct rndx_ext a_rndx;
 243         unsigned char   a_dnLow[4];
 244         unsigned char   a_dnHigh[4];
 245         unsigned char   a_isym[4];
 246         unsigned char   a_iss[4];
 247         unsigned char   a_width[4];
 248         unsigned char   a_count[4];
 249 };
 250
 251 #define AUX_GET_ANY(bigend, ax, field) \
 252   ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))
 253
 254 #define AUX_GET_DNLOW(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_dnLow)
 255 #define AUX_GET_DNHIGH(bigend, ax)      AUX_GET_ANY ((bigend), (ax), a_dnHigh)
 256 #define AUX_GET_ISYM(bigend, ax)        AUX_GET_ANY ((bigend), (ax), a_isym)
 257 #define AUX_GET_ISS(bigend, ax)         AUX_GET_ANY ((bigend), (ax), a_iss)
 258 #define AUX_GET_WIDTH(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_width)
 259 #define AUX_GET_COUNT(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_count)
 260
 261 #define AUX_PUT_ANY(bigend, val, ax, field) \
 262   ((bigend) \
 263    ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \
 264    : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0))
 265
 266 #define AUX_PUT_DNLOW(bigend, val, ax) \
 267   AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)
 268 #define AUX_PUT_DNHIGH(bigend, val, ax) \
 269   AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)
 270 #define AUX_PUT_ISYM(bigend, val, ax) \
 271   AUX_PUT_ANY ((bigend), (val), (ax), a_isym)
 272 #define AUX_PUT_ISS(bigend, val, ax) \
 273   AUX_PUT_ANY ((bigend), (val), (ax), a_iss)
 274 #define AUX_PUT_WIDTH(bigend, val, ax) \
 275   AUX_PUT_ANY ((bigend), (val), (ax), a_width)
 276 #define AUX_PUT_COUNT(bigend, val, ax) \
 277   AUX_PUT_ANY ((bigend), (val), (ax), a_count)
 278
 279 /********************** SYMBOLS **********************/
 280
 281 /* For efficiency, gdb deals directly with the unswapped symbolic
 282    information (that way it only takes the time to swap information
 283    that it really needs to read).  gdb originally retrieved the
 284    information directly from the BFD backend information, but that
 285    strategy, besides being sort of ugly, does not work for MIPS ELF,
 286    which also uses ECOFF debugging information.  This structure holds
 287    pointers to the (mostly) unswapped symbolic information.  */
 288
 289 struct ecoff_debug_info
 290 {
 291   /* The swapped ECOFF symbolic header.  */
 292   HDRR symbolic_header;
 293
 294   /* Pointers to the unswapped symbolic information.  Note that the
 295      pointers to external structures point to different sorts of
 296      information on different ECOFF targets.  The ecoff_debug_swap
 297      structure provides the sizes of the structures and the functions
 298      needed to swap the information in and out.  These pointers are
 299      all pointers to arrays, not single structures.  They will be NULL
 300      if there are no instances of the relevant structure.  These
 301      fields are also used by the assembler to output ECOFF debugging
 302      information.  */
 303   unsigned char *line;
 304   void *external_dnr;   /* struct dnr_ext */
 305   void *external_pdr;   /* struct pdr_ext */
 306   void *external_sym;   /* struct sym_ext */
 307   void *external_opt;   /* struct opt_ext */
 308   union aux_ext *external_aux;
 309   char *ss;
 310   char *ssext;
 311   void *external_fdr;   /* struct fdr_ext */
 312   void *external_rfd;   /* struct rfd_ext */
 313   void *external_ext;   /* struct ext_ext */
 314
 315   /* These fields are used when linking.  They may disappear at some
 316      point.  */
 317   char *ssext_end;
 318   void *external_ext_end;
 319
 320   /* When linking, this field holds a mapping from the input FDR
 321      numbers to the output numbers, and is used when writing out the
 322      external symbols.  It is NULL if no mapping is required.  */
 323   RFDT *ifdmap;
 324
 325   /* The swapped FDR information.  Currently this is never NULL, but
 326      code using this structure should probably double-check in case
 327      this changes in the future.  This is a pointer to an array, not a
 328      single structure.  */
 329   FDR *fdr;
 330 };
 331
 332 /* These structures are used by the ECOFF find_nearest_line function.  */
 333
 334 struct ecoff_fdrtab_entry
 335 {
 336   /* Base address in .text of this FDR.  */
 337   bfd_vma base_addr;
 338   FDR *fdr;
 339 };
 340
 341 struct ecoff_find_line
 342 {
 343   /* Allocated memory to hold function and file names.  */
 344   char *find_buffer;
 345
 346   /* FDR table, sorted by address: */
 347   long fdrtab_len;
 348   struct ecoff_fdrtab_entry *fdrtab;
 349
 350   /* Cache entry for most recently found line information.  The sect
 351      field is NULL if this cache does not contain valid information.  */
 352   struct
 353     {
 354       asection *sect;
 355       bfd_vma start;
 356       bfd_vma stop;
 357       const char *filename;
 358       const char *functionname;
 359       unsigned int line_num;
 360     } cache;
 361 };
 362
 363 /********************** SWAPPING **********************/
 364
 365 /* The generic ECOFF code needs to be able to swap debugging
 366    information in and out in the specific format used by a particular
 367    ECOFF implementation.  This structure provides the information
 368    needed to do this.  */
 369
 370 struct ecoff_debug_swap
 371 {
 372   /* Symbol table magic number.  */
 373   int sym_magic;
 374   /* Alignment of debugging information.  E.g., 4.  */
 375   bfd_size_type debug_align;
 376   /* Sizes of external symbolic information.  */
 377   bfd_size_type external_hdr_size;
 378   bfd_size_type external_dnr_size;
 379   bfd_size_type external_pdr_size;
 380   bfd_size_type external_sym_size;
 381   bfd_size_type external_opt_size;
 382   bfd_size_type external_fdr_size;
 383   bfd_size_type external_rfd_size;
 384   bfd_size_type external_ext_size;
 385   /* Functions to swap in external symbolic data.  */
 386   void (*swap_hdr_in) (bfd *, void *, HDRR *);
 387   void (*swap_dnr_in) (bfd *, void *, DNR *);
 388   void (*swap_pdr_in) (bfd *, void *, PDR *);
 389   void (*swap_sym_in) (bfd *, void *, SYMR *);
 390   void (*swap_opt_in) (bfd *, void *, OPTR *);
 391   void (*swap_fdr_in) (bfd *, void *, FDR *);
 392   void (*swap_rfd_in) (bfd *, void *, RFDT *);
 393   void (*swap_ext_in) (bfd *, void *, EXTR *);
 394   void (*swap_tir_in) (int, const struct tir_ext *, TIR *);
 395   void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *);
 396   /* Functions to swap out external symbolic data.  */
 397   void (*swap_hdr_out) (bfd *, const HDRR *, void *);
 398   void (*swap_dnr_out) (bfd *, const DNR *, void *);
 399   void (*swap_pdr_out) (bfd *, const PDR *, void *);
 400   void (*swap_sym_out) (bfd *, const SYMR *, void *);
 401   void (*swap_opt_out) (bfd *, const OPTR *, void *);
 402   void (*swap_fdr_out) (bfd *, const FDR *, void *);
 403   void (*swap_rfd_out) (bfd *, const RFDT *, void *);
 404   void (*swap_ext_out) (bfd *, const EXTR *, void *);
 405   void (*swap_tir_out) (int, const TIR *, struct tir_ext *);
 406   void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *);
 407   /* Function to read symbol data and set up pointers in
 408      ecoff_debug_info structure.  The section argument is used for
 409      ELF, not straight ECOFF.  */
 410   bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *);
 411 };
 412
 413 #endif /* ! defined (ECOFF_H) */