include/coff/rs6000.h

   1 /* IBM RS/6000 "XCOFF" file definitions for BFD.
   2    Copyright (C) 1990, 1991 Free Software Foundation, Inc.
   3    FIXME: Can someone provide a transliteration of this name into ASCII?
   4    Using the following chars caused a compiler warning on HIUX (so I replaced
   5    them with octal escapes), and isn't useful without an understanding of what
   6    character set it is.
   7    Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
   8    and John Gilmore of Cygnus Support.  */
   9
  10 /********************** FILE HEADER **********************/
  11
  12 struct external_filehdr {
  13         char f_magic[2];        /* magic number                 */
  14         char f_nscns[2];        /* number of sections           */
  15         char f_timdat[4];       /* time & date stamp            */
  16         char f_symptr[4];       /* file pointer to symtab       */
  17         char f_nsyms[4];        /* number of symtab entries     */
  18         char f_opthdr[2];       /* sizeof(optional hdr)         */
  19         char f_flags[2];        /* flags                        */
  20 };
  21
  22         /* IBM RS/6000 */
  23 #define U802WRMAGIC     0730    /* writeable text segments **chh**      */
  24 #define U802ROMAGIC     0735    /* readonly sharable text segments      */
  25 #define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
  26
  27 #define BADMAG(x)       \
  28         ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
  29          (x).f_magic != U802TOCMAGIC)
  30
  31 #define FILHDR  struct external_filehdr
  32 #define FILHSZ  20
  33
  34
  35 /********************** AOUT "OPTIONAL HEADER" **********************/
  36
  37
  38 typedef struct
  39 {
  40   unsigned char magic[2];       /* type of file                 */
  41   unsigned char vstamp[2];      /* version stamp                */
  42   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
  43   unsigned char dsize[4];       /* initialized data "  "        */
  44   unsigned char bsize[4];       /* uninitialized data "   "     */
  45   unsigned char entry[4];       /* entry pt.                    */
  46   unsigned char text_start[4];  /* base of text used for this file */
  47   unsigned char data_start[4];  /* base of data used for this file */
  48   unsigned char o_toc[4];       /* address of TOC */
  49   unsigned char o_snentry[2];   /* section number of entry point */
  50   unsigned char o_sntext[2];    /* section number of .text section */
  51   unsigned char o_sndata[2];    /* section number of .data section */
  52   unsigned char o_sntoc[2];     /* section number of TOC */
  53   unsigned char o_snloader[2];  /* section number of .loader section */
  54   unsigned char o_snbss[2];     /* section number of .bss section */
  55   unsigned char o_algntext[2];  /* .text alignment */
  56   unsigned char o_algndata[2];  /* .data alignment */
  57   unsigned char o_modtype[2];   /* module type (??) */
  58   unsigned char o_cputype[2];   /* cpu type */
  59   unsigned char o_maxstack[4];  /* max stack size (??) */
  60   unsigned char o_maxdata[4];   /* max data size (??) */
  61   unsigned char o_resv2[12];    /* reserved */
  62 }
  63 AOUTHDR;
  64
  65 #define AOUTSZ 72
  66 #define SMALL_AOUTSZ (28)
  67 #define AOUTHDRSZ 72
  68
  69 /********************** SECTION HEADER **********************/
  70
  71
  72 struct external_scnhdr {
  73         char            s_name[8];      /* section name                 */
  74         char            s_paddr[4];     /* physical address, aliased s_nlib */
  75         char            s_vaddr[4];     /* virtual address              */
  76         char            s_size[4];      /* section size                 */
  77         char            s_scnptr[4];    /* file ptr to raw data for section */
  78         char            s_relptr[4];    /* file ptr to relocation       */
  79         char            s_lnnoptr[4];   /* file ptr to line numbers     */
  80         char            s_nreloc[2];    /* number of relocation entries */
  81         char            s_nlnno[2];     /* number of line number entries*/
  82         char            s_flags[4];     /* flags                        */
  83 };
  84
  85 #define SCNHDR  struct external_scnhdr
  86 #define SCNHSZ  40
  87
  88 /********************** LINE NUMBERS **********************/
  89
  90 /* 1 line number entry for every "breakpointable" source line in a section.
  91  * Line numbers are grouped on a per function basis; first entry in a function
  92  * grouping will have l_lnno = 0 and in place of physical address will be the
  93  * symbol table index of the function name.
  94  */
  95 struct external_lineno {
  96         union {
  97                 char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
  98                 char l_paddr[4];        /* (physical) address of line number    */
  99         } l_addr;
 100         char l_lnno[2]; /* line number          */
 101 };
 102
 103
 104 #define LINENO  struct external_lineno
 105 #define LINESZ  6
 106
 107
 108 /********************** SYMBOLS **********************/
 109
 110 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 111 #define E_FILNMLEN      14      /* # characters in a file name          */
 112 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 113
 114 struct external_syment
 115 {
 116   union {
 117     char e_name[E_SYMNMLEN];
 118     struct {
 119       char e_zeroes[4];
 120       char e_offset[4];
 121     } e;
 122   } e;
 123   char e_value[4];
 124   char e_scnum[2];
 125   char e_type[2];
 126   char e_sclass[1];
 127   char e_numaux[1];
 128 };
 129
 130
 131
 132 #define N_BTMASK        (017)
 133 #define N_TMASK         (060)
 134 #define N_BTSHFT        (4)
 135 #define N_TSHIFT        (2)
 136
 137
 138 union external_auxent {
 139         struct {
 140                 char x_tagndx[4];       /* str, un, or enum tag indx */
 141                 union {
 142                         struct {
 143                             char  x_lnno[2]; /* declaration line number */
 144                             char  x_size[2]; /* str/union/array size */
 145                         } x_lnsz;
 146                         char x_fsize[4];        /* size of function */
 147                 } x_misc;
 148                 union {
 149                         struct {                /* if ISFCN, tag, or .bb */
 150                             char x_lnnoptr[4];  /* ptr to fcn line # */
 151                             char x_endndx[4];   /* entry ndx past block end */
 152                         } x_fcn;
 153                         struct {                /* if ISARY, up to 4 dimen. */
 154                             char x_dimen[E_DIMNUM][2];
 155                         } x_ary;
 156                 } x_fcnary;
 157                 char x_tvndx[2];                /* tv index */
 158         } x_sym;
 159
 160         union {
 161                 char x_fname[E_FILNMLEN];
 162                 struct {
 163                         char x_zeroes[4];
 164                         char x_offset[4];
 165                 } x_n;
 166         } x_file;
 167
 168         struct {
 169                 char x_scnlen[4];                       /* section length */
 170                 char x_nreloc[2];       /* # relocation entries */
 171                 char x_nlinno[2];       /* # line numbers */
 172         } x_scn;
 173
 174         struct {
 175                 char x_tvfill[4];       /* tv fill value */
 176                 char x_tvlen[2];        /* length of .tv */
 177                 char x_tvran[2][2];     /* tv range */
 178         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 179
 180         struct {
 181                 unsigned char x_scnlen[4];
 182                 unsigned char x_parmhash[4];
 183                 unsigned char x_snhash[2];
 184                 unsigned char x_smtyp[1];
 185                 unsigned char x_smclas[1];
 186                 unsigned char x_stab[4];
 187                 unsigned char x_snstab[2];
 188         } x_csect;
 189
 190 };
 191
 192 #define SYMENT  struct external_syment
 193 #define SYMESZ  18
 194 #define AUXENT  union external_auxent
 195 #define AUXESZ  18
 196 #define DBXMASK 0x80            /* for dbx storage mask */
 197 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 198
 199
 200
 201 /********************** RELOCATION DIRECTIVES **********************/
 202
 203
 204 struct external_reloc {
 205   char r_vaddr[4];
 206   char r_symndx[4];
 207   char r_size[1];
 208   char r_type[1];
 209 };
 210
 211
 212 #define RELOC struct external_reloc
 213 #define RELSZ 10
 214
 215 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
 216 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
 217 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
 218 /* For new sections we havn't heard of before */
 219 #define DEFAULT_SECTION_ALIGNMENT 4
 220
 221 /* The ldhdr structure.  This appears at the start of the .loader
 222    section.  */
 223
 224 struct external_ldhdr
 225 {
 226   bfd_byte l_version[4];
 227   bfd_byte l_nsyms[4];
 228   bfd_byte l_nreloc[4];
 229   bfd_byte l_istlen[4];
 230   bfd_byte l_nimpid[4];
 231   bfd_byte l_impoff[4];
 232   bfd_byte l_stlen[4];
 233   bfd_byte l_stoff[4];
 234 };
 235
 236 #define LDHDRSZ (8 * 4)
 237
 238 struct external_ldsym
 239 {
 240   union
 241     {
 242       bfd_byte _l_name[SYMNMLEN];
 243       struct
 244         {
 245           bfd_byte _l_zeroes[4];
 246           bfd_byte _l_offset[4];
 247         } _l_l;
 248     } _l;
 249   bfd_byte l_value[4];
 250   bfd_byte l_scnum[2];
 251   bfd_byte l_smtype[1];
 252   bfd_byte l_smclas[1];
 253   bfd_byte l_ifile[4];
 254   bfd_byte l_parm[4];
 255 };
 256
 257 #define LDSYMSZ (8 + 3 * 4 + 2 + 2)
 258
 259 struct external_ldrel
 260 {
 261   bfd_byte l_vaddr[4];
 262   bfd_byte l_symndx[4];
 263   bfd_byte l_rtype[2];
 264   bfd_byte l_rsecnm[2];
 265 };
 266
 267 #define LDRELSZ (2 * 4 + 2 * 2)