include/coff/or32.h

   1 /* COFF specification for OpenRISC 1000.
   2    Copyright (C) 1993-2000, 2002 Free Software Foundation, Inc.
   3    Contributed by David Wood @ New York University.
   4    Modified by Johan Rydberg, <johan.rydberg@netinsight.se>
   5
   6    This file is part of BFD, the Binary File Descriptor library.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef OR32
  23 # define OR32
  24 #endif
  25
  26 /* File Header and related definitions.  */
  27 struct external_filehdr
  28 {
  29   char f_magic[2];      /* magic number             */
  30   char f_nscns[2];      /* number of sections       */
  31   char f_timdat[4];     /* time & date stamp        */
  32   char f_symptr[4];     /* file pointer to symtab   */
  33   char f_nsyms[4];      /* number of symtab entries */
  34   char f_opthdr[2];     /* sizeof(optional hdr)     */
  35   char f_flags[2];      /* flags                    */
  36 };
  37
  38 #define FILHDR  struct external_filehdr
  39 #define FILHSZ  20
  40
  41 /* Magic numbers for OpenRISC 1000. As it is know we use the
  42    numbers for Am29000.
  43
  44    (AT&T will assign the "real" magic number).  */
  45 #define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB).  */
  46 #define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB).  */
  47
  48 #define OR32_MAGIC_BIG          SIPFBOMAGIC
  49 #define OR32_MAGIC_LITTLE       SIPRBOMAGIC
  50 #define OR32BADMAG(x)     (((x).f_magic!=OR32_MAGIC_BIG) && \
  51                                               ((x).f_magic!=OR32_MAGIC_LITTLE))
  52
  53 #define OMAGIC OR32_MAGIC_BIG
  54
  55 /* Optional (a.out) header.  */
  56 typedef struct external_aouthdr
  57 {
  58   char  magic[2];         /* type of file                     */
  59   char  vstamp[2];        /* version stamp                    */
  60   char  tsize[4];         /* text size in bytes, padded to FW bdry */
  61   char  dsize[4];         /* initialized data "  "            */
  62   char  bsize[4];         /* uninitialized data "   "         */
  63   char  entry[4];         /* entry pt.                        */
  64   char  text_start[4];    /* base of text used for this file  */
  65   char  data_start[4];    /* base of data used for this file  */
  66 } AOUTHDR;
  67
  68 #define AOUTSZ      28
  69 #define AOUTHDRSZ   28
  70
  71 /* aouthdr magic numbers.  */
  72 #define NMAGIC    0410    /* separate i/d executable.  */
  73 #define SHMAGIC   0406    /* NYU/Ultra3 shared data executable
  74                              (writable text).  */
  75
  76 #define _ETEXT          "_etext"
  77
  78 /* Section header and related definitions.  */
  79 struct external_scnhdr
  80 {
  81   char      s_name[8];      /* section name                   */
  82   char      s_paddr[4];     /* physical address, aliased s_nlib */
  83   char      s_vaddr[4];     /* virtual address                */
  84   char      s_size[4];      /* section size                   */
  85   char      s_scnptr[4];    /* file ptr to raw data for section */
  86   char      s_relptr[4];    /* file ptr to relocation         */
  87   char      s_lnnoptr[4];   /* file ptr to line numbers       */
  88   char      s_nreloc[2];    /* number of relocation entries   */
  89   char      s_nlnno[2];     /* number of line number entries  */
  90   char      s_flags[4];     /* flags                          */
  91 };
  92
  93 #define SCNHDR  struct external_scnhdr
  94 #define SCNHSZ  40
  95
  96 /* Names of "special" sections:  */
  97 #define _TEXT   ".text"
  98 #define _DATA   ".data"
  99 #define _BSS    ".bss"
 100 #define _LIT    ".lit"
 101
 102 /* Section types - with additional section type for global
 103    registers which will be relocatable for the OpenRISC 1000.
 104
 105    In instances where it is necessary for a linker to produce an
 106    output file which contains text or data not based at virtual
 107    address 0, e.g. for a ROM, then the linker should accept
 108    address base information as command input and use PAD sections
 109    to skip over unused addresses.  */
 110 #define STYP_BSSREG 0x1200      /* Global register area (like STYP_INFO) */
 111 #define STYP_ENVIR  0x2200      /* Environment (like STYP_INFO) */
 112 #define STYP_ABS    0x4000      /* Absolute (allocated, not reloc, loaded) */
 113
 114 /* Relocation information declaration and related definitions:  */
 115 struct external_reloc
 116 {
 117   char r_vaddr[4];    /* (virtual) address of reference */
 118   char r_symndx[4];   /* index into symbol table */
 119   char r_type[2];     /* relocation type */
 120 };
 121
 122 #define RELOC           struct external_reloc
 123 #define RELSZ           10              /* sizeof (RELOC) */
 124
 125 /* Relocation types for the OpenRISC 1000: */
 126
 127 #define R_ABS     0     /* reference is absolute */
 128 #define R_IREL    030   /* instruction relative (jmp/call) */
 129 #define R_IABS    031   /* instruction absolute (jmp/call) */
 130 #define R_ILOHALF 032   /* instruction low half  (const)  */
 131 #define R_IHIHALF 033   /* instruction high half (consth) part 1 */
 132 #define R_IHCONST 034   /* instruction high half (consth) part 2 */
 133                         /* constant offset of R_IHIHALF relocation */
 134 #define R_BYTE    035   /* relocatable byte value */
 135 #define R_HWORD   036   /* relocatable halfword value */
 136 #define R_WORD    037   /* relocatable word value */
 137
 138 #define R_IGLBLRC 040   /* instruction global register RC */
 139 #define R_IGLBLRA 041   /* instruction global register RA */
 140 #define R_IGLBLRB 042   /* instruction global register RB */
 141
 142 /*
 143   NOTE:
 144   All the "I" forms refer to 29000 instruction formats.  The linker is
 145   expected to know how the numeric information is split and/or aligned
 146   within the instruction word(s).  R_BYTE works for instructions, too.
 147
 148   If the parameter to a CONSTH instruction is a relocatable type, two
 149   relocation records are written.  The first has an r_type of R_IHIHALF
 150   (33 octal) and a normal r_vaddr and r_symndx.  The second relocation
 151   record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
 152   is redundant), and an r_symndx containing the 32-bit constant offset
 153   to the relocation instead of the actual symbol table index.  This
 154   second record is always written, even if the constant offset is zero.
 155   The constant fields of the instruction are set to zero.  */
 156
 157 /* Line number entry declaration and related definitions:  */
 158 struct external_lineno
 159 {
 160   union
 161   {
 162     char l_symndx[4];  /* function name symbol index, iff l_lnno == 0*/
 163     char l_paddr[4];   /* (physical) address of line number    */
 164   }
 165   l_addr;
 166
 167   char l_lnno[2];      /* line number     */
 168 };
 169
 170 #define LINENO          struct external_lineno
 171 #define LINESZ          6                 /* sizeof (LINENO) */
 172
 173 /* Symbol entry declaration and related definitions:  */
 174 #define E_SYMNMLEN      8         /* Number of characters in a symbol name */
 175
 176 struct external_syment
 177 {
 178   union
 179   {
 180     char e_name[E_SYMNMLEN];
 181     struct
 182     {
 183       char e_zeroes[4];
 184       char e_offset[4];
 185     }
 186     e;
 187   }
 188   e;
 189
 190   char e_value[4];
 191   char e_scnum[2];
 192   char e_type[2];
 193   char e_sclass[1];
 194   char e_numaux[1];
 195 };
 196
 197 #define SYMENT  struct external_syment
 198 #define SYMESZ  18
 199
 200 /* Storage class definitions - new classes for global registers:  */
 201 #define C_GLBLREG       19              /* global register */
 202 #define C_EXTREG        20              /* external global register */
 203 #define C_DEFREG        21              /* ext. def. of global register */
 204
 205 /* Derived symbol mask/shifts:  */
 206 #define N_BTMASK        (0xf)
 207 #define N_BTSHFT        (4)
 208 #define N_TMASK         (0x30)
 209 #define N_TSHIFT        (2)
 210
 211 /* Auxiliary symbol table entry declaration and related
 212    definitions.  */
 213 #define E_FILNMLEN  14  /* # characters in a file name    */
 214 #define E_DIMNUM    4   /* # array dimensions in auxiliary entry */
 215
 216 union external_auxent
 217 {
 218   struct
 219   {
 220     char x_tagndx[4];       /* str, un, or enum tag indx */
 221     union
 222     {
 223       struct
 224       {
 225         char  x_lnno[2];    /* declaration line number */
 226         char  x_size[2];    /* str/union/array size */
 227       }
 228       x_lnsz;
 229
 230       char x_fsize[4];      /* size of function */
 231     }
 232     x_misc;
 233
 234     union
 235     {
 236       struct                      /* if ISFCN, tag, or .bb */
 237       {
 238         char x_lnnoptr[4];  /* ptr to fcn line # */
 239         char x_endndx[4];   /* entry ndx past block end */
 240       }
 241       x_fcn;
 242
 243       struct              /* if ISARY, up to 4 dimen. */
 244       {
 245         char x_dimen[E_DIMNUM][2];
 246       }
 247       x_ary;
 248     }
 249     x_fcnary;
 250
 251     char x_tvndx[2];        /* tv index */
 252   }
 253   x_sym;
 254
 255   union
 256   {
 257     char x_fname[E_FILNMLEN];
 258
 259     struct
 260     {
 261       char x_zeroes[4];
 262       char x_offset[4];
 263     }
 264     x_n;
 265   }
 266   x_file;
 267
 268   struct
 269   {
 270     char x_scnlen[4];       /* section length */
 271     char x_nreloc[2];       /* # relocation entries */
 272     char x_nlinno[2];       /* # line numbers */
 273   }
 274   x_scn;
 275
 276   struct
 277   {
 278     char x_tvfill[4];       /* tv fill value */
 279     char x_tvlen[2];        /* length of .tv */
 280     char x_tvran[2][2];     /* tv range */
 281   }
 282   x_tv;                   /* info about .tv section
 283                              (in auxent of symbol .tv)) */
 284 };
 285
 286 #define AUXENT          union external_auxent
 287 #define AUXESZ          18