include/coff/powerpc.h

   1 /* Basic coff information for the PowerPC
   2  *
   3  * Based on coff/rs6000.h, coff/i386.h and others.
   4  *
   5  * Initial release: Kim Knuttila (krk@cygnus.com)
   6  */
   7
   8 /********************** FILE HEADER **********************/
   9
  10 struct external_filehdr {
  11   char f_magic[2];      /* magic number                 */
  12   char f_nscns[2];      /* number of sections           */
  13   char f_timdat[4];     /* time & date stamp            */
  14   char f_symptr[4];     /* file pointer to symtab       */
  15   char f_nsyms[4];      /* number of symtab entries     */
  16   char f_opthdr[2];     /* sizeof(optional hdr)         */
  17   char f_flags[2];      /* flags                        */
  18 };
  19
  20 #define FILHDR  struct external_filehdr
  21 #define FILHSZ  20
  22
  23 /* Bits for f_flags:
  24  *      F_RELFLG        relocation info stripped from file
  25  *      F_EXEC          file is executable (no unresolved external references)
  26  *      F_LNNO          line numbers stripped from file
  27  *      F_LSYMS         local symbols stripped from file
  28  *      F_AR32WR        file has byte ordering of an AR32WR machine (e.g. vax)
  29  */
  30
  31 #define F_RELFLG        (0x0001)
  32 #define F_EXEC          (0x0002)
  33 #define F_LNNO          (0x0004)
  34 #define F_LSYMS         (0x0008)
  35
  36 /* extra NT defines */
  37 #define PPCMAGIC       0760         /* peeked on aa PowerPC Windows NT box */
  38 #define DOSMAGIC       0x5a4d       /* from arm.h, i386.h */
  39 #define NT_SIGNATURE   0x00004550   /* from arm.h, i386.h */
  40
  41 /* from winnt.h */
  42 #define IMAGE_NT_OPTIONAL_HDR_MAGIC        0x10b
  43
  44 #define PPCBADMAG(x) ((x).f_magic != PPCMAGIC)
  45
  46 /********************** AOUT "OPTIONAL HEADER" **********************/
  47
  48 typedef struct
  49 {
  50   char  magic[2];               /* type of file                         */
  51   char  vstamp[2];              /* version stamp                        */
  52   char  tsize[4];               /* text size in bytes, padded to FW bdry*/
  53   char  dsize[4];               /* initialized data "  "                */
  54   char  bsize[4];               /* uninitialized data "   "             */
  55   char  entry[4];               /* entry pt.                            */
  56   char  text_start[4];          /* base of text used for this file */
  57   char  data_start[4];          /* base of data used for this file */
  58 }
  59 AOUTHDR;
  60
  61 #define AOUTSZ 28
  62 #define AOUTHDRSZ 28
  63
  64 /********************** SECTION HEADER **********************/
  65
  66 struct external_scnhdr {
  67   char          s_name[8];      /* section name                     */
  68   char          s_paddr[4];     /* physical address, aliased s_nlib */
  69   char          s_vaddr[4];     /* virtual address                  */
  70   char          s_size[4];      /* section size                     */
  71   char          s_scnptr[4];    /* file ptr to raw data for section */
  72   char          s_relptr[4];    /* file ptr to relocation           */
  73   char          s_lnnoptr[4];   /* file ptr to line numbers         */
  74   char          s_nreloc[2];    /* number of relocation entries     */
  75   char          s_nlnno[2];     /* number of line number entries    */
  76   char          s_flags[4];     /* flags                            */
  77 };
  78
  79 #define SCNHDR  struct external_scnhdr
  80 #define SCNHSZ  40
  81
  82 /*
  83  * names of "special" sections
  84  */
  85 #define _TEXT   ".text"
  86 #define _DATA   ".data"
  87 #define _BSS    ".bss"
  88 #define _COMMENT ".comment"
  89 #define _LIB ".lib"
  90
  91 /********************** LINE NUMBERS **********************/
  92
  93 /* 1 line number entry for every "breakpointable" source line in a section.
  94  * Line numbers are grouped on a per function basis; first entry in a function
  95  * grouping will have l_lnno = 0 and in place of physical address will be the
  96  * symbol table index of the function name.
  97  */
  98 struct external_lineno {
  99   union {
 100     char l_symndx[4];   /* function name symbol index, iff l_lnno == 0 */
 101     char l_paddr[4];    /* (physical) address of line number           */
 102   } l_addr;
 103   char l_lnno[2];       /* line number                                 */
 104 };
 105
 106 #define LINENO  struct external_lineno
 107 #define LINESZ  6
 108
 109 /********************** SYMBOLS **********************/
 110
 111 #define E_SYMNMLEN      8     /* # characters in a symbol name       */
 112
 113 /* Allow the file name length to be overridden in the including file   */
 114 #ifndef E_FILNMLEN
 115 #define E_FILNMLEN      14
 116 #endif
 117
 118 #define E_DIMNUM        4     /* # array dimensions in auxiliary entry */
 119
 120 struct external_syment
 121 {
 122   union {
 123     char e_name[E_SYMNMLEN];
 124     struct {
 125       char e_zeroes[4];
 126       char e_offset[4];
 127     } e;
 128   } e;
 129   char e_value[4];
 130   char e_scnum[2];
 131   char e_type[2];
 132   char e_sclass[1];
 133   char e_numaux[1];
 134 };
 135
 136 #define SYMENT  struct external_syment
 137 #define SYMESZ  18
 138
 139 #define N_BTMASK        (0xf)
 140 #define N_TMASK         (0x30)
 141 #define N_BTSHFT        (4)
 142 #define N_TSHIFT        (2)
 143
 144 union external_auxent {
 145   struct {
 146     char x_tagndx[4];              /* str, un, or enum tag indx       */
 147     union {
 148       struct {
 149         char  x_lnno[2];           /* declaration line number         */
 150         char  x_size[2];           /* str/union/array size            */
 151       } x_lnsz;
 152       char x_fsize[4];             /* size of function                */
 153     } x_misc;
 154     union {
 155       struct {                     /* if ISFCN, tag, or .bb           */
 156         char x_lnnoptr[4];         /* ptr to fcn line #               */
 157         char x_endndx[4];          /* entry ndx past block end        */
 158       } x_fcn;
 159       struct {                     /* if ISARY, up to 4 dimen.        */
 160         char x_dimen[E_DIMNUM][2];
 161       } x_ary;
 162     } x_fcnary;
 163     char x_tvndx[2];               /* tv index                        */
 164   } x_sym;
 165
 166   union {
 167     char x_fname[E_FILNMLEN];
 168     struct {
 169       char x_zeroes[4];
 170       char x_offset[4];
 171     } x_n;
 172   } x_file;
 173
 174   struct {
 175     char x_scnlen[4];              /* section length                  */
 176     char x_nreloc[2];              /* # relocation entries            */
 177     char x_nlinno[2];              /* # line numbers                  */
 178     char x_checksum[4];            /* section COMDAT checksum         */
 179     char x_associated[2];          /* COMDAT associated section index */
 180     char x_comdat[1];              /* COMDAT selection number         */
 181   } x_scn;
 182 };
 183
 184 #define AUXENT  union external_auxent
 185 #define AUXESZ  18
 186
 187 #define _ETEXT  "etext"
 188
 189 /********************** RELOCATION DIRECTIVES **********************/
 190
 191 struct external_reloc {
 192   char r_vaddr[4];
 193   char r_symndx[4];
 194   char r_type[2];
 195 };
 196
 197 #define RELOC struct external_reloc
 198 #define RELSZ 10
 199