include/coff/arm.h

   1 /* ARM COFF support for BFD.
   2    Copyright (C) 1998, 1999 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #define COFFARM 1
  21
  22 /********************** FILE HEADER **********************/
  23
  24 struct external_filehdr
  25 {
  26         char f_magic[2];        /* magic number                 */
  27         char f_nscns[2];        /* number of sections           */
  28         char f_timdat[4];       /* time & date stamp            */
  29         char f_symptr[4];       /* file pointer to symtab       */
  30         char f_nsyms[4];        /* number of symtab entries     */
  31         char f_opthdr[2];       /* sizeof(optional hdr)         */
  32         char f_flags[2];        /* flags                        */
  33 };
  34
  35 /* Bits for f_flags:
  36  *      F_RELFLG        relocation info stripped from file
  37  *      F_EXEC          file is executable (no unresolved external references)
  38  *      F_LNNO          line numbers stripped from file
  39  *      F_LSYMS         local symbols stripped from file
  40  *      F_INTERWORK     file supports switching between ARM and Thumb instruction sets
  41  *      F_INTERWORK_SET the F_INTERWORK bit is valid
  42  *      F_APCS_FLOAT    code passes float arguments in float registers
  43  *      F_PIC           code is reentrant/position-independent
  44  *      F_AR32WR        file has byte ordering of an AR32WR machine (e.g. vax)
  45  *      F_APCS_26       file uses 26 bit ARM Procedure Calling Standard
  46  *      F_APCS_SET      the F_APCS_26, F_APCS_FLOAT and F_PIC bits have been initialised
  47  *      F_SOFT_FLOAT    code does not use floating point instructions
  48  */
  49
  50 #define F_RELFLG        (0x0001)
  51 #define F_EXEC          (0x0002)
  52 #define F_LNNO          (0x0004)
  53 #define F_LSYMS         (0x0008)
  54 #define F_INTERWORK     (0x0010)
  55 #define F_INTERWORK_SET (0x0020)
  56 #define F_APCS_FLOAT    (0x0040)
  57 #undef  F_AR16WR
  58 #define F_PIC           (0x0080)
  59 #define F_AR32WR        (0x0100)
  60 #define F_APCS_26       (0x0400)
  61 #define F_APCS_SET      (0x0800)
  62 #define F_SOFT_FLOAT    (0x2000)
  63
  64 /* Bits stored in flags field of the internal_f structure */
  65
  66 #define F_INTERWORK     (0x0010)
  67 #define F_APCS_FLOAT    (0x0040)
  68 #define F_PIC           (0x0080)
  69 #define F_APCS26        (0x1000)
  70 #define F_ARM_ARCHITECTURE_MASK (0x4000+0x0800+0x0400)
  71 #define F_ARM_2         (0x0400)
  72 #define F_ARM_2a        (0x0800)
  73 #define F_ARM_3         (0x0c00)
  74 #define F_ARM_3M        (0x4000)
  75 #define F_ARM_4         (0x4400)
  76 #define F_ARM_4T        (0x4800)
  77 #define F_ARM_5         (0x4c00)
  78
  79 /*
  80  * ARMMAGIC ought to encoded the procesor type,
  81  * but it is too late to change it now, instead
  82  * the flags field of the internal_f structure
  83  * is used as shown above.
  84  *
  85  * XXX - NC 5/6/97
  86  */
  87
  88 #define ARMMAGIC        0xa00  /* I just made this up */
  89
  90 #define ARMBADMAG(x) (((x).f_magic != ARMMAGIC))
  91
  92 #define FILHDR  struct external_filehdr
  93 #define FILHSZ  20
  94
  95
  96 /********************** AOUT "OPTIONAL HEADER" **********************/
  97
  98
  99 typedef struct
 100 {
 101   char  magic[2];               /* type of file                         */
 102   char  vstamp[2];              /* version stamp                        */
 103   char  tsize[4];               /* text size in bytes, padded to FW bdry*/
 104   char  dsize[4];               /* initialized data "  "                */
 105   char  bsize[4];               /* uninitialized data "   "             */
 106   char  entry[4];               /* entry pt.                            */
 107   char  text_start[4];          /* base of text used for this file */
 108   char  data_start[4];          /* base of data used for this file */
 109 }
 110 AOUTHDR;
 111
 112
 113 #define AOUTSZ 28
 114 #define AOUTHDRSZ 28
 115
 116 #define OMAGIC          0404    /* object files, eg as output */
 117 #define ZMAGIC          0413    /* demand load format, eg normal ld output */
 118 #define STMAGIC         0401    /* target shlib */
 119 #define SHMAGIC         0443    /* host   shlib */
 120
 121
 122 /* define some NT default values */
 123 /*  #define NT_IMAGE_BASE        0x400000 moved to internal.h */
 124 #define NT_SECTION_ALIGNMENT 0x1000
 125 #define NT_FILE_ALIGNMENT    0x200
 126 #define NT_DEF_RESERVE       0x100000
 127 #define NT_DEF_COMMIT        0x1000
 128
 129 /********************** SECTION HEADER **********************/
 130 struct external_scnhdr
 131 {
 132         char            s_name[8];      /* section name                 */
 133         char            s_paddr[4];     /* physical address, aliased s_nlib */
 134         char            s_vaddr[4];     /* virtual address              */
 135         char            s_size[4];      /* section size                 */
 136         char            s_scnptr[4];    /* file ptr to raw data for section */
 137         char            s_relptr[4];    /* file ptr to relocation       */
 138         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 139         char            s_nreloc[2];    /* number of relocation entries */
 140         char            s_nlnno[2];     /* number of line number entries*/
 141         char            s_flags[4];     /* flags                        */
 142 };
 143
 144 #define SCNHDR  struct external_scnhdr
 145 #define SCNHSZ  40
 146
 147 /*
 148  * names of "special" sections
 149  */
 150 #define _TEXT   ".text"
 151 #define _DATA   ".data"
 152 #define _BSS    ".bss"
 153 #define _COMMENT ".comment"
 154 #define _LIB ".lib"
 155
 156 /* We use the .rdata section to hold read only data.  */
 157 #define _LIT    ".rdata"
 158
 159 /********************** LINE NUMBERS **********************/
 160
 161 /* 1 line number entry for every "breakpointable" source line in a section.
 162  * Line numbers are grouped on a per function basis; first entry in a function
 163  * grouping will have l_lnno = 0 and in place of physical address will be the
 164  * symbol table index of the function name.
 165  */
 166 struct external_lineno
 167 {
 168         union
 169         {
 170                 char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
 171                 char l_paddr[4];        /* (physical) address of line number    */
 172         } l_addr;
 173         char l_lnno[2]; /* line number          */
 174 };
 175
 176
 177 #define LINENO  struct external_lineno
 178 #define LINESZ  6
 179
 180
 181 /********************** SYMBOLS **********************/
 182
 183 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 184 #define E_FILNMLEN      14      /* # characters in a file name          */
 185 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 186
 187 struct external_syment
 188 {
 189   union
 190   {
 191     char e_name[E_SYMNMLEN];
 192     struct
 193     {
 194       char e_zeroes[4];
 195       char e_offset[4];
 196     } e;
 197   } e;
 198   char e_value[4];
 199   char e_scnum[2];
 200   char e_type[2];
 201   char e_sclass[1];
 202   char e_numaux[1];
 203 };
 204
 205 #define N_BTMASK        (0xf)
 206 #define N_TMASK         (0x30)
 207 #define N_BTSHFT        (4)
 208 #define N_TSHIFT        (2)
 209
 210 union external_auxent
 211 {
 212         struct
 213         {
 214                 char x_tagndx[4];       /* str, un, or enum tag indx */
 215                 union
 216                 {
 217                         struct
 218                         {
 219                             char  x_lnno[2]; /* declaration line number */
 220                             char  x_size[2]; /* str/union/array size */
 221                         } x_lnsz;
 222                         char x_fsize[4];        /* size of function */
 223                 } x_misc;
 224                 union
 225                 {
 226                         struct                  /* if ISFCN, tag, or .bb */
 227                         {
 228                             char x_lnnoptr[4];  /* ptr to fcn line # */
 229                             char x_endndx[4];   /* entry ndx past block end */
 230                         } x_fcn;
 231                         struct                  /* if ISARY, up to 4 dimen. */
 232                         {
 233                             char x_dimen[E_DIMNUM][2];
 234                         } x_ary;
 235                 } x_fcnary;
 236                 char x_tvndx[2];                /* tv index */
 237         } x_sym;
 238
 239         union
 240         {
 241                 char x_fname[E_FILNMLEN];
 242                 struct
 243                 {
 244                         char x_zeroes[4];
 245                         char x_offset[4];
 246                 } x_n;
 247         } x_file;
 248
 249         struct
 250         {
 251                 char x_scnlen[4];       /* section length */
 252                 char x_nreloc[2];       /* # relocation entries */
 253                 char x_nlinno[2];       /* # line numbers */
 254                 char x_checksum[4];     /* section COMDAT checksum */
 255                 char x_associated[2];   /* COMDAT associated section index */
 256                 char x_comdat[1];       /* COMDAT selection number */
 257         } x_scn;
 258
 259         struct
 260         {
 261                 char x_tvfill[4];       /* tv fill value */
 262                 char x_tvlen[2];        /* length of .tv */
 263                 char x_tvran[2][2];     /* tv range */
 264         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 265 };
 266
 267 #define SYMENT  struct external_syment
 268 #define SYMESZ  18
 269 #define AUXENT  union external_auxent
 270 #define AUXESZ  18
 271
 272 #define _ETEXT  "etext"
 273
 274 /********************** RELOCATION DIRECTIVES **********************/
 275 struct external_reloc
 276 {
 277   char r_vaddr[4];
 278   char r_symndx[4];
 279   char r_type[2];
 280   char r_offset[4];
 281 };
 282
 283 #define RELOC struct external_reloc
 284 #define RELSZ 14