include/coff/or32.h

   1 /* COFF specification for OpenRISC 1000.
   2    Copyright (C) 1993-2014 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 3 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,
  21    MA 02110-1301, USA.  */
  22
  23 #ifndef OR32
  24 # define OR32
  25 #endif
  26
  27 /* File Header and related definitions.  */
  28 struct external_filehdr
  29 {
  30   char f_magic[2];      /* magic number             */
  31   char f_nscns[2];      /* number of sections       */
  32   char f_timdat[4];     /* time & date stamp        */
  33   char f_symptr[4];     /* file pointer to symtab   */
  34   char f_nsyms[4];      /* number of symtab entries */
  35   char f_opthdr[2];     /* sizeof(optional hdr)     */
  36   char f_flags[2];      /* flags                    */
  37 };
  38
  39 #define FILHDR  struct external_filehdr
  40 #define FILHSZ  20
  41
  42 /* Magic numbers for OpenRISC 1000. As it is know we use the
  43    numbers for Am29000.
  44
  45    (AT&T will assign the "real" magic number).  */
  46 #define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB).  */
  47 #define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB).  */
  48
  49 #define OR32_MAGIC_BIG          SIPFBOMAGIC
  50 #define OR32_MAGIC_LITTLE       SIPRBOMAGIC
  51 #define OR32BADMAG(x)     (((x).f_magic!=OR32_MAGIC_BIG) && \
  52                                               ((x).f_magic!=OR32_MAGIC_LITTLE))
  53
  54 #define OMAGIC OR32_MAGIC_BIG
  55
  56 /* Optional (a.out) header.  */
  57 typedef struct external_aouthdr
  58 {
  59   char  magic[2];         /* type of file                     */
  60   char  vstamp[2];        /* version stamp                    */
  61   char  tsize[4];         /* text size in bytes, padded to FW bdry */
  62   char  dsize[4];         /* initialized data "  "            */
  63   char  bsize[4];         /* uninitialized data "   "         */
  64   char  entry[4];         /* entry pt.                        */
  65   char  text_start[4];    /* base of text used for this file  */
  66   char  data_start[4];    /* base of data used for this file  */
  67 } AOUTHDR;
  68
  69 #define AOUTSZ      28
  70 #define AOUTHDRSZ   28
  71
  72 /* aouthdr magic numbers.  */
  73 #define NMAGIC    0410    /* separate i/d executable.  */
  74 #define SHMAGIC   0406    /* NYU/Ultra3 shared data executable
  75                              (writable text).  */
  76
  77 #define _ETEXT          "_etext"
  78
  79 /* Section header and related definitions.  */
  80 struct external_scnhdr
  81 {
  82   char      s_name[8];      /* section name                   */
  83   char      s_paddr[4];     /* physical address, aliased s_nlib */
  84   char      s_vaddr[4];     /* virtual address                */
  85   char      s_size[4];      /* section size                   */
  86   char      s_scnptr[4];    /* file ptr to raw data for section */
  87   char      s_relptr[4];    /* file ptr to relocation         */
  88   char      s_lnnoptr[4];   /* file ptr to line numbers       */
  89   char      s_nreloc[2];    /* number of relocation entries   */
  90   char      s_nlnno[2];     /* number of line number entries  */
  91   char      s_flags[4];     /* flags                          */
  92 };
  93
  94 #define SCNHDR  struct external_scnhdr
  95 #define SCNHSZ  40
  96
  97 /* Names of "special" sections:  */
  98 #define _TEXT   ".text"
  99 #define _DATA   ".data"
 100 #define _BSS    ".bss"
 101 #define _LIT    ".lit"
 102
 103 /* Section types - with additional section type for global
 104    registers which will be relocatable for the OpenRISC 1000.
 105
 106    In instances where it is necessary for a linker to produce an
 107    output file which contains text or data not based at virtual
 108    address 0, e.g. for a ROM, then the linker should accept
 109    address base information as command input and use PAD sections
 110    to skip over unused addresses.  */
 111 #define STYP_BSSREG 0x1200      /* Global register area (like STYP_INFO) */
 112 #define STYP_ENVIR  0x2200      /* Environment (like STYP_INFO) */
 113 #define STYP_ABS    0x4000      /* Absolute (allocated, not reloc, loaded) */
 114
 115 /* Relocation information declaration and related definitions:  */
 116 struct external_reloc
 117 {
 118   char r_vaddr[4];    /* (virtual) address of reference */
 119   char r_symndx[4];   /* index into symbol table */
 120   char r_type[2];     /* relocation type */
 121 };
 122
 123 #define RELOC           struct external_reloc
 124 #define RELSZ           10              /* sizeof (RELOC) */
 125
 126 /* Relocation types for the OpenRISC 1000: */
 127
 128 #define R_ABS     0     /* reference is absolute */
 129 #define R_IREL    030   /* instruction relative (jmp/call) */
 130 #define R_IABS    031   /* instruction absolute (jmp/call) */
 131 #define R_ILOHALF 032   /* instruction low half  (const)  */
 132 #define R_IHIHALF 033   /* instruction high half (consth) part 1 */
 133 #define R_IHCONST 034   /* instruction high half (consth) part 2 */
 134                         /* constant offset of R_IHIHALF relocation */
 135 #define R_BYTE    035   /* relocatable byte value */
 136 #define R_HWORD   036   /* relocatable halfword value */
 137 #define R_WORD    037   /* relocatable word value */
 138
 139 #define R_IGLBLRC 040   /* instruction global register RC */
 140 #define R_IGLBLRA 041   /* instruction global register RA */
 141 #define R_IGLBLRB 042   /* instruction global register RB */
 142
 143 /*
 144   NOTE:
 145   All the "I" forms refer to 29000 instruction formats.  The linker is
 146   expected to know how the numeric information is split and/or aligned
 147   within the instruction word(s).  R_BYTE works for instructions, too.
 148
 149   If the parameter to a CONSTH instruction is a relocatable type, two
 150   relocation records are written.  The first has an r_type of R_IHIHALF
 151   (33 octal) and a normal r_vaddr and r_symndx.  The second relocation
 152   record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which
 153   is redundant), and an r_symndx containing the 32-bit constant offset
 154   to the relocation instead of the actual symbol table index.  This
 155   second record is always written, even if the constant offset is zero.
 156   The constant fields of the instruction are set to zero.  */
 157
 158 /* Line number entry declaration and related definitions:  */
 159 struct external_lineno
 160 {
 161   union
 162   {
 163     char l_symndx[4];  /* function name symbol index, iff l_lnno == 0*/
 164     char l_paddr[4];   /* (physical) address of line number    */
 165   }
 166   l_addr;
 167
 168   char l_lnno[2];      /* line number     */
 169 };
 170
 171 #define LINENO          struct external_lineno
 172 #define LINESZ          6                 /* sizeof (LINENO) */
 173
 174 /* Symbol entry declaration and related definitions:  */
 175 #define E_SYMNMLEN      8         /* Number of characters in a symbol name */
 176
 177 struct external_syment
 178 {
 179   union
 180   {
 181     char e_name[E_SYMNMLEN];
 182     struct
 183     {
 184       char e_zeroes[4];
 185       char e_offset[4];
 186     }
 187     e;
 188   }
 189   e;
 190
 191   char e_value[4];
 192   char e_scnum[2];
 193   char e_type[2];
 194   char e_sclass[1];
 195   char e_numaux[1];
 196 };
 197
 198 #define SYMENT  struct external_syment
 199 #define SYMESZ  18
 200
 201 /* Storage class definitions - new classes for global registers:  */
 202 #define C_GLBLREG       19              /* global register */
 203 #define C_EXTREG        20              /* external global register */
 204 #define C_DEFREG        21              /* ext. def. of global register */
 205
 206 /* Derived symbol mask/shifts:  */
 207 #define N_BTMASK        (0xf)
 208 #define N_BTSHFT        (4)
 209 #define N_TMASK         (0x30)
 210 #define N_TSHIFT        (2)
 211
 212 /* Auxiliary symbol table entry declaration and related
 213    definitions.  */
 214 #define E_FILNMLEN  14  /* # characters in a file name    */
 215 #define E_DIMNUM    4   /* # array dimensions in auxiliary entry */
 216
 217 union external_auxent
 218 {
 219   struct
 220   {
 221     char x_tagndx[4];       /* str, un, or enum tag indx */
 222     union
 223     {
 224       struct
 225       {
 226         char  x_lnno[2];    /* declaration line number */
 227         char  x_size[2];    /* str/union/array size */
 228       }
 229       x_lnsz;
 230
 231       char x_fsize[4];      /* size of function */
 232     }
 233     x_misc;
 234
 235     union
 236     {
 237       struct                      /* if ISFCN, tag, or .bb */
 238       {
 239         char x_lnnoptr[4];  /* ptr to fcn line # */
 240         char x_endndx[4];   /* entry ndx past block end */
 241       }
 242       x_fcn;
 243
 244       struct              /* if ISARY, up to 4 dimen. */
 245       {
 246         char x_dimen[E_DIMNUM][2];
 247       }
 248       x_ary;
 249     }
 250     x_fcnary;
 251
 252     char x_tvndx[2];        /* tv index */
 253   }
 254   x_sym;
 255
 256   union
 257   {
 258     char x_fname[E_FILNMLEN];
 259
 260     struct
 261     {
 262       char x_zeroes[4];
 263       char x_offset[4];
 264     }
 265     x_n;
 266   }
 267   x_file;
 268
 269   struct
 270   {
 271     char x_scnlen[4];       /* section length */
 272     char x_nreloc[2];       /* # relocation entries */
 273     char x_nlinno[2];       /* # line numbers */
 274   }
 275   x_scn;
 276
 277   struct
 278   {
 279     char x_tvfill[4];       /* tv fill value */
 280     char x_tvlen[2];        /* length of .tv */
 281     char x_tvran[2][2];     /* tv range */
 282   }
 283   x_tv;                   /* info about .tv section
 284                              (in auxent of symbol .tv)) */
 285 };
 286
 287 #define AUXENT          union external_auxent
 288 #define AUXESZ          18