include/coff-rs6000.h

   1 /* IBM RS/6000 "XCOFF" file definitions for BFD.
   2    Copyright (C) 1990, 1991 Free Software Foundation, Inc.
   3    Written by Mimi Phûông-Thåo Võ and John Gilmore.
   4    Contributed by IBM Corporation and 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  sizeof(FILHDR)
  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];
  45   unsigned char o_snentry[2];
  46   unsigned char o_sntext[2];
  47   unsigned char o_sndata[2];
  48   unsigned char o_sntoc[2];
  49   unsigned char o_snloader[2];
  50   unsigned char o_snbss[2];
  51   unsigned char o_algntext[2];
  52   unsigned char o_algndata[2];
  53   unsigned char o_modtype[2];
  54   unsigned char o_resv1[2];
  55   unsigned char o_maxstack[4];
  56   unsigned char o_resv2[16];
  57 }
  58 AOUTHDR;
  59
  60 #define AOUTSZ (sizeof(AOUTHDR))
  61
  62 #define RS6K_AOUTHDR_OMAGIC     0x0107  /* old: text & data writeable */
  63 #define RS6K_AOUTHDR_NMAGIC     0x0108  /* new: text r/o, data r/w */
  64 #define RS6K_AOUTHDR_ZMAGIC     0x010B  /* paged: text r/o, both page-aligned */
  65
  66
  67 /********************** SECTION HEADER **********************/
  68
  69
  70 struct external_scnhdr {
  71         char            s_name[8];      /* section name                 */
  72         char            s_paddr[4];     /* physical address, aliased s_nlib */
  73         char            s_vaddr[4];     /* virtual address              */
  74         char            s_size[4];      /* section size                 */
  75         char            s_scnptr[4];    /* file ptr to raw data for section */
  76         char            s_relptr[4];    /* file ptr to relocation       */
  77         char            s_lnnoptr[4];   /* file ptr to line numbers     */
  78         char            s_nreloc[2];    /* number of relocation entries */
  79         char            s_nlnno[2];     /* number of line number entries*/
  80         char            s_flags[4];     /* flags                        */
  81 };
  82
  83 /*
  84  * names of "special" sections
  85  */
  86 #define _TEXT   ".text"
  87 #define _DATA   ".data"
  88 #define _BSS    ".bss"
  89
  90
  91 #define SCNHDR  struct external_scnhdr
  92 #define SCNHSZ  sizeof(SCNHDR)
  93
  94
  95 /********************** LINE NUMBERS **********************/
  96
  97 /* 1 line number entry for every "breakpointable" source line in a section.
  98  * Line numbers are grouped on a per function basis; first entry in a function
  99  * grouping will have l_lnno = 0 and in place of physical address will be the
 100  * symbol table index of the function name.
 101  */
 102 struct external_lineno {
 103         union {
 104                 char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
 105                 char l_paddr[4];        /* (physical) address of line number    */
 106         } l_addr;
 107         char l_lnno[2]; /* line number          */
 108 };
 109
 110
 111 #define LINENO  struct external_lineno
 112 #define LINESZ  sizeof(LINENO)
 113
 114
 115 /********************** SYMBOLS **********************/
 116
 117 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 118 #define E_FILNMLEN      14      /* # characters in a file name          */
 119 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 120
 121 struct external_syment
 122 {
 123   union {
 124     char e_name[E_SYMNMLEN];
 125     struct {
 126       char e_zeroes[4];
 127       char e_offset[4];
 128     } e;
 129   } e;
 130   char e_value[4];
 131   char e_scnum[2];
 132   char e_type[2];
 133   char e_sclass[1];
 134   char e_numaux[1];
 135 };
 136
 137
 138
 139 #define N_BTMASK        (017)
 140 #define N_TMASK         (060)
 141 #define N_BTSHFT        (4)
 142 #define N_TSHIFT        (2)
 143
 144
 145 union external_auxent {
 146         struct {
 147                 char x_tagndx[4];       /* str, un, or enum tag indx */
 148                 union {
 149                         struct {
 150                             char  x_lnno[2]; /* declaration line number */
 151                             char  x_size[2]; /* str/union/array size */
 152                         } x_lnsz;
 153                         char x_fsize[4];        /* size of function */
 154                 } x_misc;
 155                 union {
 156                         struct {                /* if ISFCN, tag, or .bb */
 157                             char x_lnnoptr[4];  /* ptr to fcn line # */
 158                             char x_endndx[4];   /* entry ndx past block end */
 159                         } x_fcn;
 160                         struct {                /* if ISARY, up to 4 dimen. */
 161                             char x_dimen[E_DIMNUM][2];
 162                         } x_ary;
 163                 } x_fcnary;
 164                 char x_tvndx[2];                /* tv index */
 165         } x_sym;
 166
 167         union {
 168                 char x_fname[E_FILNMLEN];
 169                 struct {
 170                         char x_zeroes[4];
 171                         char x_offset[4];
 172                 } x_n;
 173         } x_file;
 174
 175         struct {
 176                 char x_scnlen[4];                       /* section length */
 177                 char x_nreloc[2];       /* # relocation entries */
 178                 char x_nlinno[2];       /* # line numbers */
 179         } x_scn;
 180
 181         struct {
 182                 char x_tvfill[4];       /* tv fill value */
 183                 char x_tvlen[2];        /* length of .tv */
 184                 char x_tvran[2][2];     /* tv range */
 185         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 186
 187         struct {
 188                 unsigned char x_scnlen[4];
 189                 unsigned char x_parmhash[4];
 190                 unsigned char x_snhash[2];
 191                 unsigned char x_smtyp[1];
 192                 unsigned char x_smclas[1];
 193                 unsigned char x_stab[4];
 194                 unsigned char x_snstab[2];
 195         } x_csect;
 196
 197 };
 198
 199 #define SYMENT  struct external_syment
 200 #define SYMESZ  18
 201 #define AUXENT  union external_auxent
 202 #define AUXESZ  18
 203 #define DBXMASK 0x80            /* for dbx storage mask */
 204 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 205
 206
 207
 208 /********************** RELOCATION DIRECTIVES **********************/
 209
 210
 211 struct external_reloc {
 212   char r_vaddr[4];
 213   char r_symndx[4];
 214   char r_size[1];
 215   char r_type[1];
 216 };
 217
 218
 219 #define RELOC struct external_reloc
 220 #define RELSZ 10
 221
 222 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
 223 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
 224 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
 225 /* For new sections we havn't heard of before */
 226 #define DEFAULT_SECTION_ALIGNMENT 4