release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/boot/rs6000.h

   1
   2
   3 /********************** FILE HEADER **********************/
   4
   5 struct external_filehdr {
   6         char f_magic[2];        /* magic number                 */
   7         char f_nscns[2];        /* number of sections           */
   8         char f_timdat[4];       /* time & date stamp            */
   9         char f_symptr[4];       /* file pointer to symtab       */
  10         char f_nsyms[4];        /* number of symtab entries     */
  11         char f_opthdr[2];       /* sizeof(optional hdr)         */
  12         char f_flags[2];        /* flags                        */
  13 };
  14
  15         /* IBM RS/6000 */
  16 #define U802WRMAGIC     0730    /* writeable text segments **chh**      */
  17 #define U802ROMAGIC     0735    /* readonly sharable text segments      */
  18 #define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
  19
  20 #define BADMAG(x)       \
  21         ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
  22          (x).f_magic != U802TOCMAGIC)
  23
  24 #define FILHDR  struct external_filehdr
  25 #define FILHSZ  20
  26
  27
  28 /********************** AOUT "OPTIONAL HEADER" **********************/
  29
  30
  31 typedef struct
  32 {
  33   unsigned char magic[2];       /* type of file                 */
  34   unsigned char vstamp[2];      /* version stamp                */
  35   unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
  36   unsigned char dsize[4];       /* initialized data "  "        */
  37   unsigned char bsize[4];       /* uninitialized data "   "     */
  38   unsigned char entry[4];       /* entry pt.                    */
  39   unsigned char text_start[4];  /* base of text used for this file */
  40   unsigned char data_start[4];  /* base of data used for this file */
  41   unsigned char o_toc[4];       /* address of TOC */
  42   unsigned char o_snentry[2];   /* section number of entry point */
  43   unsigned char o_sntext[2];    /* section number of .text section */
  44   unsigned char o_sndata[2];    /* section number of .data section */
  45   unsigned char o_sntoc[2];     /* section number of TOC */
  46   unsigned char o_snloader[2];  /* section number of .loader section */
  47   unsigned char o_snbss[2];     /* section number of .bss section */
  48   unsigned char o_algntext[2];  /* .text alignment */
  49   unsigned char o_algndata[2];  /* .data alignment */
  50   unsigned char o_modtype[2];   /* module type (??) */
  51   unsigned char o_cputype[2];   /* cpu type */
  52   unsigned char o_maxstack[4];  /* max stack size (??) */
  53   unsigned char o_maxdata[4];   /* max data size (??) */
  54   unsigned char o_resv2[12];    /* reserved */
  55 }
  56 AOUTHDR;
  57
  58 #define AOUTSZ 72
  59 #define SMALL_AOUTSZ (28)
  60 #define AOUTHDRSZ 72
  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 #define _PAD    ".pad"
  90 #define _LOADER ".loader"
  91
  92 #define SCNHDR  struct external_scnhdr
  93 #define SCNHSZ  40
  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[4];       /* function name symbol index, iff l_lnno == 0*/
 115                 char l_paddr[4];        /* (physical) address of line number    */
 116         } l_addr;
 117         char l_lnno[2]; /* line number          */
 118 };
 119
 120
 121 #define LINENO  struct external_lineno
 122 #define LINESZ  6
 123
 124
 125 /********************** SYMBOLS **********************/
 126
 127 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 128 #define E_FILNMLEN      14      /* # characters in a file name          */
 129 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 130
 131 struct external_syment
 132 {
 133   union {
 134     char e_name[E_SYMNMLEN];
 135     struct {
 136       char e_zeroes[4];
 137       char e_offset[4];
 138     } e;
 139   } e;
 140   char e_value[4];
 141   char e_scnum[2];
 142   char e_type[2];
 143   char e_sclass[1];
 144   char e_numaux[1];
 145 };
 146
 147
 148
 149 #define N_BTMASK        (017)
 150 #define N_TMASK         (060)
 151 #define N_BTSHFT        (4)
 152 #define N_TSHIFT        (2)
 153
 154
 155 union external_auxent {
 156         struct {
 157                 char x_tagndx[4];       /* str, un, or enum tag indx */
 158                 union {
 159                         struct {
 160                             char  x_lnno[2]; /* declaration line number */
 161                             char  x_size[2]; /* str/union/array size */
 162                         } x_lnsz;
 163                         char x_fsize[4];        /* size of function */
 164                 } x_misc;
 165                 union {
 166                         struct {                /* if ISFCN, tag, or .bb */
 167                             char x_lnnoptr[4];  /* ptr to fcn line # */
 168                             char x_endndx[4];   /* entry ndx past block end */
 169                         } x_fcn;
 170                         struct {                /* if ISARY, up to 4 dimen. */
 171                             char x_dimen[E_DIMNUM][2];
 172                         } x_ary;
 173                 } x_fcnary;
 174                 char x_tvndx[2];                /* tv index */
 175         } x_sym;
 176
 177         union {
 178                 char x_fname[E_FILNMLEN];
 179                 struct {
 180                         char x_zeroes[4];
 181                         char x_offset[4];
 182                 } x_n;
 183         } x_file;
 184
 185         struct {
 186                 char x_scnlen[4];                       /* section length */
 187                 char x_nreloc[2];       /* # relocation entries */
 188                 char x_nlinno[2];       /* # line numbers */
 189         } x_scn;
 190
 191         struct {
 192                 char x_tvfill[4];       /* tv fill value */
 193                 char x_tvlen[2];        /* length of .tv */
 194                 char x_tvran[2][2];     /* tv range */
 195         } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 196
 197         struct {
 198                 unsigned char x_scnlen[4];
 199                 unsigned char x_parmhash[4];
 200                 unsigned char x_snhash[2];
 201                 unsigned char x_smtyp[1];
 202                 unsigned char x_smclas[1];
 203                 unsigned char x_stab[4];
 204                 unsigned char x_snstab[2];
 205         } x_csect;
 206
 207 };
 208
 209 #define SYMENT  struct external_syment
 210 #define SYMESZ  18
 211 #define AUXENT  union external_auxent
 212 #define AUXESZ  18
 213 #define DBXMASK 0x80            /* for dbx storage mask */
 214 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 215
 216
 217
 218 /********************** RELOCATION DIRECTIVES **********************/
 219
 220
 221 struct external_reloc {
 222   char r_vaddr[4];
 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 10
 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