include/coff/rs6000.h

   1 /* IBM RS/6000 "XCOFF" file definitions for BFD.
   2    Copyright (C) 1990, 1991, 2001 Free Software Foundation, Inc.
   3    Written by Mimi Phuong-Thao Vo of IBM
   4    and John Gilmore of Cygnus Support.  */
   5
   6 /********************** FILE HEADER **********************/
   7
   8 struct external_filehdr {
   9         char f_magic[2];        /* magic number                 */
  10         char f_nscns[2];        /* number of sections           */
  11         char f_timdat[4];       /* time & date stamp            */
  12         char f_symptr[4];       /* file pointer to symtab       */
  13         char f_nsyms[4];        /* number of symtab entries     */
  14         char f_opthdr[2];       /* sizeof(optional hdr)         */
  15         char f_flags[2];        /* flags                        */
  16 };
  17
  18         /* IBM RS/6000 */
  19 #define U802WRMAGIC     0730    /* writeable text segments **chh**      */
  20 #define U802ROMAGIC     0735    /* readonly sharable text segments      */
  21 #define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
  22
  23 #define BADMAG(x)       \
  24         ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
  25          (x).f_magic != U802TOCMAGIC)
  26
  27 #define FILHDR  struct external_filehdr
  28 #define FILHSZ  20
  29
  30
  31 /********************** AOUT "OPTIONAL HEADER" **********************/
  32
  33
  34 typedef struct
  35 {
  36   unsigned char magic[2];       /* type of file                 */
  37   unsigned char vstamp[2];      /* version stamp                */
  38   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
  39   unsigned char dsize[4];       /* initialized data "  "        */
  40   unsigned char bsize[4];       /* uninitialized data "   "     */
  41   unsigned char entry[4];       /* entry pt.                    */
  42   unsigned char text_start[4];  /* base of text used for this file */
  43   unsigned char data_start[4];  /* base of data used for this file */
  44   unsigned char o_toc[4];       /* address of TOC */
  45   unsigned char o_snentry[2];   /* section number of entry point */
  46   unsigned char o_sntext[2];    /* section number of .text section */
  47   unsigned char o_sndata[2];    /* section number of .data section */
  48   unsigned char o_sntoc[2];     /* section number of TOC */
  49   unsigned char o_snloader[2];  /* section number of .loader section */
  50   unsigned char o_snbss[2];     /* section number of .bss section */
  51   unsigned char o_algntext[2];  /* .text alignment */
  52   unsigned char o_algndata[2];  /* .data alignment */
  53   unsigned char o_modtype[2];   /* module type (??) */
  54   unsigned char o_cputype[2];   /* cpu type */
  55   unsigned char o_maxstack[4];  /* max stack size (??) */
  56   unsigned char o_maxdata[4];   /* max data size (??) */
  57   unsigned char o_resv2[12];    /* reserved */
  58 }
  59 AOUTHDR;
  60
  61 #define AOUTSZ 72
  62 #define SMALL_AOUTSZ (28)
  63 #define AOUTHDRSZ 72
  64
  65 /********************** SECTION HEADER **********************/
  66
  67
  68 struct external_scnhdr {
  69         char            s_name[8];      /* section name                 */
  70         char            s_paddr[4];     /* physical address, aliased s_nlib */
  71         char            s_vaddr[4];     /* virtual address              */
  72         char            s_size[4];      /* section size                 */
  73         char            s_scnptr[4];    /* file ptr to raw data for section */
  74         char            s_relptr[4];    /* file ptr to relocation       */
  75         char            s_lnnoptr[4];   /* file ptr to line numbers     */
  76         char            s_nreloc[2];    /* number of relocation entries */
  77         char            s_nlnno[2];     /* number of line number entries*/
  78         char            s_flags[4];     /* flags                        */
  79 };
  80
  81 #define SCNHDR  struct external_scnhdr
  82 #define SCNHSZ  40
  83
  84 /********************** LINE NUMBERS **********************/
  85
  86 /* 1 line number entry for every "breakpointable" source line in a section.
  87  * Line numbers are grouped on a per function basis; first entry in a function
  88  * grouping will have l_lnno = 0 and in place of physical address will be the
  89  * symbol table index of the function name.
  90  */
  91 struct external_lineno {
  92         union {
  93                 char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
  94                 char l_paddr[4];        /* (physical) address of line number    */
  95         } l_addr;
  96         char l_lnno[2]; /* line number          */
  97 };
  98
  99
 100 #define LINENO  struct external_lineno
 101 #define LINESZ  6
 102
 103
 104 /********************** SYMBOLS **********************/
 105
 106 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 107 #define E_FILNMLEN      14      /* # characters in a file name          */
 108 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 109
 110 struct external_syment
 111 {
 112   union {
 113     char e_name[E_SYMNMLEN];
 114     struct {
 115       char e_zeroes[4];
 116       char e_offset[4];
 117     } e;
 118   } e;
 119   char e_value[4];
 120   char e_scnum[2];
 121   char e_type[2];
 122   char e_sclass[1];
 123   char e_numaux[1];
 124 };
 125
 126
 127
 128 #define N_BTMASK        (017)
 129 #define N_TMASK         (060)
 130 #define N_BTSHFT        (4)
 131 #define N_TSHIFT        (2)
 132
 133
 134 union external_auxent {
 135         struct {
 136                 char x_tagndx[4];       /* str, un, or enum tag indx */
 137                 union {
 138                         struct {
 139                             char  x_lnno[2]; /* declaration line number */
 140                             char  x_size[2]; /* str/union/array size */
 141                         } x_lnsz;
 142                         char x_fsize[4];        /* size of function */
 143                 } x_misc;
 144                 union {
 145                         struct {                /* if ISFCN, tag, or .bb */
 146                             char x_lnnoptr[4];  /* ptr to fcn line # */
 147                             char x_endndx[4];   /* entry ndx past block end */
 148                         } x_fcn;
 149                         struct {                /* if ISARY, up to 4 dimen. */
 150                             char x_dimen[E_DIMNUM][2];
 151                         } x_ary;
 152                 } x_fcnary;
 153                 char x_tvndx[2];                /* tv index */
 154         } x_sym;
 155
 156         union {
 157                 char x_fname[E_FILNMLEN];
 158                 struct {
 159                         char x_zeroes[4];
 160                         char x_offset[4];
 161                 } x_n;
 162         } x_file;
 163
 164         struct {
 165                 char x_scnlen[4];                       /* section length */
 166                 char x_nreloc[2];       /* # relocation entries */
 167                 char x_nlinno[2];       /* # line numbers */
 168         } x_scn;
 169
 170         struct {
 171                 char x_tvfill[4];       /* tv fill value */
 172                 char x_tvlen[2];        /* length of .tv */
 173                 char x_tvran[2][2];     /* tv range */
 174         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 175
 176         struct {
 177                 unsigned char x_scnlen[4];
 178                 unsigned char x_parmhash[4];
 179                 unsigned char x_snhash[2];
 180                 unsigned char x_smtyp[1];
 181                 unsigned char x_smclas[1];
 182                 unsigned char x_stab[4];
 183                 unsigned char x_snstab[2];
 184         } x_csect;
 185
 186 };
 187
 188 #define SYMENT  struct external_syment
 189 #define SYMESZ  18
 190 #define AUXENT  union external_auxent
 191 #define AUXESZ  18
 192 #define DBXMASK 0x80            /* for dbx storage mask */
 193 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 194
 195
 196
 197 /********************** RELOCATION DIRECTIVES **********************/
 198
 199
 200 struct external_reloc {
 201   char r_vaddr[4];
 202   char r_symndx[4];
 203   char r_size[1];
 204   char r_type[1];
 205 };
 206
 207
 208 #define RELOC struct external_reloc
 209 #define RELSZ 10
 210
 211 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
 212 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
 213 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
 214 /* For new sections we havn't heard of before */
 215 #define DEFAULT_SECTION_ALIGNMENT 4
 216
 217 /* The ldhdr structure.  This appears at the start of the .loader
 218    section.  */
 219
 220 struct external_ldhdr
 221 {
 222   bfd_byte l_version[4];
 223   bfd_byte l_nsyms[4];
 224   bfd_byte l_nreloc[4];
 225   bfd_byte l_istlen[4];
 226   bfd_byte l_nimpid[4];
 227   bfd_byte l_impoff[4];
 228   bfd_byte l_stlen[4];
 229   bfd_byte l_stoff[4];
 230 };
 231
 232 #define LDHDRSZ (8 * 4)
 233
 234 struct external_ldsym
 235 {
 236   union
 237     {
 238       bfd_byte _l_name[SYMNMLEN];
 239       struct
 240         {
 241           bfd_byte _l_zeroes[4];
 242           bfd_byte _l_offset[4];
 243         } _l_l;
 244     } _l;
 245   bfd_byte l_value[4];
 246   bfd_byte l_scnum[2];
 247   bfd_byte l_smtype[1];
 248   bfd_byte l_smclas[1];
 249   bfd_byte l_ifile[4];
 250   bfd_byte l_parm[4];
 251 };
 252
 253 #define LDSYMSZ (8 + 3 * 4 + 2 + 2)
 254
 255 struct external_ldrel
 256 {
 257   bfd_byte l_vaddr[4];
 258   bfd_byte l_symndx[4];
 259   bfd_byte l_rtype[2];
 260   bfd_byte l_rsecnm[2];
 261 };
 262
 263 #define LDRELSZ (2 * 4 + 2 * 2)