include/coff/rs6k64.h

   1 /* IBM RS/6000 "XCOFF64" file definitions for BFD.
   2    Copyright (C) 2000 Free Software Foundation, Inc.  */
   3
   4 /********************** FILE HEADER **********************/
   5
   6 struct external_filehdr {
   7         char f_magic[2];        /* magic number                 */
   8         char f_nscns[2];        /* number of sections           */
   9         char f_timdat[4];       /* time & date stamp            */
  10         char f_symptr[8];/* file pointer to symtab      */
  11         char f_opthdr[2];       /* sizeof(optional hdr)         */
  12         char f_flags[2];        /* flags                        */
  13         char f_nsyms[4];        /* number of symtab entries     */
  14 };
  15
  16         /* IBM RS/6000 */
  17 #define U803XTOCMAGIC 0757      /* readonly text segments and TOC, XCOFF64 */
  18
  19 #define BADMAG(x) ((x).f_magic != U803XTOCMAGIC)
  20
  21 #define FILHDR  struct external_filehdr
  22 #define FILHSZ  24
  23
  24 /********************** AOUT "OPTIONAL HEADER" **********************/
  25
  26
  27 typedef struct
  28 {
  29   unsigned char magic[2];               /* type of file                 */
  30   unsigned char vstamp[2];              /* version stamp                */
  31   unsigned char o_debugger[4];          /* reserved                     */
  32   unsigned char text_start[8];  /* base of text used for this file */
  33   unsigned char data_start[8];  /* base of data used for this file */
  34   unsigned char o_toc[8];       /* address of TOC */
  35   unsigned char o_snentry[2];           /* section number of entry point */
  36   unsigned char o_sntext[2];            /* section number of .text section */
  37   unsigned char o_sndata[2];            /* section number of .data section */
  38   unsigned char o_sntoc[2];             /* section number of TOC */
  39   unsigned char o_snloader[2];          /* section number of .loader section */
  40   unsigned char o_snbss[2];             /* section number of .bss section */
  41   unsigned char o_algntext[2];          /* .text alignment */
  42   unsigned char o_algndata[2];          /* .data alignment */
  43   unsigned char o_modtype[2];           /* module type (??) */
  44   unsigned char o_cputype[2];           /* cpu type */
  45   unsigned char o_resv2[4];             /* reserved                     */
  46   unsigned char tsize[8];               /* text size bytes, padded to FW bdry */
  47   unsigned char dsize[8];               /* initialized data "  "        */
  48   unsigned char bsize[8];               /* uninitialized data "   "     */
  49   unsigned char entry[8];               /* entry pt.                    */
  50   unsigned char o_maxstack[8];  /* max stack size (??)          */
  51   unsigned char o_maxdata[8];   /* max data size (??)           */
  52   unsigned char o_resv3[16];            /* reserved                     */
  53 }
  54 AOUTHDR;
  55
  56 #define AOUTSZ 120
  57 #define SMALL_AOUTSZ (0)
  58 #define AOUTHDRSZ 72
  59
  60 #define RS6K_AOUTHDR_OMAGIC     0x0107  /* old: text & data writeable */
  61 #define RS6K_AOUTHDR_NMAGIC     0x0108  /* new: text r/o, data r/w */
  62 #define RS6K_AOUTHDR_ZMAGIC     0x010B  /* paged: text r/o, both page-aligned */
  63
  64
  65 /********************** SECTION HEADER **********************/
  66
  67
  68 struct external_scnhdr {
  69         char    s_name[8];              /* section name                 */
  70         char    s_paddr[8];     /* physical address, aliased s_nlib */
  71         char    s_vaddr[8];     /* virtual address              */
  72         char    s_size[8];      /* section size                 */
  73         char    s_scnptr[8];    /* file ptr to raw data for section */
  74         char    s_relptr[8];    /* file ptr to relocation       */
  75         char    s_lnnoptr[8];   /* file ptr to line numbers     */
  76         char    s_nreloc[4];    /* number of relocation entries */
  77         char    s_nlnno[4];     /* number of line number entries*/
  78         char    s_flags[4];             /* flags                        */
  79         char    s_pad[4];               /* padding */
  80 };
  81
  82 /*
  83  * names of "special" sections
  84  */
  85 #define _TEXT   ".text"
  86 #define _DATA   ".data"
  87 #define _BSS    ".bss"
  88 #define _PAD    ".pad"
  89 #define _LOADER ".loader"
  90
  91 #define SCNHDR  struct external_scnhdr
  92
  93 #define SCNHSZ  72
  94
  95 /* XCOFF uses a special .loader section with type STYP_LOADER.  */
  96 #define STYP_LOADER 0x1000
  97
  98 /* XCOFF uses a special .debug section with type STYP_DEBUG.  */
  99 #define STYP_DEBUG 0x2000
 100
 101 /* XCOFF handles line number or relocation overflow by creating
 102    another section header with STYP_OVRFLO set.  */
 103 #define STYP_OVRFLO 0x8000
 104
 105 /********************** LINE NUMBERS **********************/
 106
 107 /* 1 line number entry for every "breakpointable" source line in a section.
 108  * Line numbers are grouped on a per function basis; first entry in a function
 109  * grouping will have l_lnno = 0 and in place of physical address will be the
 110  * symbol table index of the function name.
 111  */
 112 struct external_lineno {
 113         union {
 114                 char l_symndx[8];/* function name symbol index, iff l_lnno == 0*/
 115                 char l_paddr[8];        /* (physical) address of line number    */
 116         } l_addr;
 117         char l_lnno[4];         /* line number          */
 118 };
 119
 120
 121 #define LINENO  struct external_lineno
 122
 123 #define LINESZ  12
 124
 125
 126 /********************** SYMBOLS **********************/
 127
 128 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 129 #define E_FILNMLEN      14      /* # characters in a file name          */
 130 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 131
 132 struct external_syment
 133 {
 134   union {
 135     char e_value[8];
 136   } e;
 137   char e_offset[4];
 138   char e_scnum[2];
 139   char e_type[2];
 140   char e_sclass[1];
 141   char e_numaux[1];
 142 };
 143
 144
 145
 146 #define N_BTMASK        (017)
 147 #define N_TMASK         (060)
 148 #define N_BTSHFT        (4)
 149 #define N_TSHIFT        (2)
 150
 151
 152 union external_auxent {
 153
 154     struct {
 155         union {
 156             struct {
 157                 char x_lnno[4];         /* declaration line number */
 158                 char x_size[2];         /* str/union/array size */
 159             } x_lnsz;
 160             struct {
 161                 char x_lnnoptr[8];/* ptr to fcn line */
 162                 char x_fsize[4];         /* size of function */
 163                 char x_endndx[4];        /* entry ndx past block end */
 164             } x_fcn;
 165         } x_fcnary;
 166     } x_sym;
 167
 168     union {
 169         char x_fname[E_FILNMLEN];
 170         struct {
 171             char x_zeroes[4];
 172             char x_offset[4];
 173             char          x_pad[6];
 174             unsigned char x_ftype[1];
 175             unsigned char x_resv[2];
 176         } x_n;
 177     } x_file;
 178
 179     struct {
 180         char x_exptr[8];
 181         char x_fsize[4];
 182         char x_endndx[4];
 183         char x_pad[1];
 184     } x_except;
 185
 186     struct {
 187             unsigned char x_scnlen_lo[4];
 188             unsigned char x_parmhash[4];
 189             unsigned char x_snhash[2];
 190             unsigned char x_smtyp[1];
 191             unsigned char x_smclas[1];
 192             unsigned char x_scnlen_hi[4];
 193             unsigned char x_pad[1];
 194     } x_csect;
 195
 196     struct {
 197         char x_pad[17];
 198         char x_auxtype[1];
 199     } x_auxtype;
 200 };
 201
 202 #define SYMENT  struct external_syment
 203 #define SYMESZ  18
 204 #define AUXENT  union external_auxent
 205 #define AUXESZ  18
 206 #define DBXMASK 0x80            /* for dbx storage mask */
 207 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 208
 209 /* Values for auxtype field in XCOFF64, taken from AIX 4.3 sym.h */
 210 #define _AUX_EXCEPT     255
 211 #define _AUX_FCN        254
 212 #define _AUX_SYM        253
 213 #define _AUX_FILE       252
 214 #define _AUX_CSECT      251
 215
 216
 217
 218 /********************** RELOCATION DIRECTIVES **********************/
 219
 220
 221 struct external_reloc {
 222   char r_vaddr[8];
 223   char r_symndx[4];
 224   char r_size[1];
 225   char r_type[1];
 226 };
 227
 228
 229 #define RELOC struct external_reloc
 230 #define RELSZ 14
 231
 232 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
 233 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
 234 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
 235 /* For new sections we havn't heard of before */
 236 #define DEFAULT_SECTION_ALIGNMENT 4