LXR linux/arch/powerpc/boot/rs6000.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* IBM RS/6000 "XCOFF" file definitions for BFD.
   3   Copyright (C) 1990, 1991 Free Software Foundation, Inc.
   4   FIXME: Can someone provide a transliteration of this name into ASCII?
   5   Using the following chars caused a compiler warning on HIUX (so I replaced
   6   them with octal escapes), and isn't useful without an understanding of what
   7   character set it is.
   8   Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
   9   and John Gilmore of Cygnus Support.  */
  10
  11/********************** FILE HEADER **********************/
  12
  13struct external_filehdr {
  14        char f_magic[2];        /* magic number                 */
  15        char f_nscns[2];        /* number of sections           */
  16        char f_timdat[4];       /* time & date stamp            */
  17        char f_symptr[4];       /* file pointer to symtab       */
  18        char f_nsyms[4];        /* number of symtab entries     */
  19        char f_opthdr[2];       /* sizeof(optional hdr)         */
  20        char f_flags[2];        /* flags                        */
  21};
  22
  23        /* IBM RS/6000 */
  24#define U802WRMAGIC     0730    /* writeable text segments **chh**      */
  25#define U802ROMAGIC     0735    /* readonly sharable text segments      */
  26#define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
  27
  28#define BADMAG(x)       \
  29        ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
  30         (x).f_magic != U802TOCMAGIC)
  31
  32#define FILHDR  struct external_filehdr
  33#define FILHSZ  20
  34
  35
  36/********************** AOUT "OPTIONAL HEADER" **********************/
  37
  38
  39typedef struct
  40{
  41  unsigned char magic[2];       /* type of file                 */
  42  unsigned char vstamp[2];      /* version stamp                */
  43  unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
  44  unsigned char dsize[4];       /* initialized data "  "        */
  45  unsigned char bsize[4];       /* uninitialized data "   "     */
  46  unsigned char entry[4];       /* entry pt.                    */
  47  unsigned char text_start[4];  /* base of text used for this file */
  48  unsigned char data_start[4];  /* base of data used for this file */
  49  unsigned char o_toc[4];       /* address of TOC */
  50  unsigned char o_snentry[2];   /* section number of entry point */
  51  unsigned char o_sntext[2];    /* section number of .text section */
  52  unsigned char o_sndata[2];    /* section number of .data section */
  53  unsigned char o_sntoc[2];     /* section number of TOC */
  54  unsigned char o_snloader[2];  /* section number of .loader section */
  55  unsigned char o_snbss[2];     /* section number of .bss section */
  56  unsigned char o_algntext[2];  /* .text alignment */
  57  unsigned char o_algndata[2];  /* .data alignment */
  58  unsigned char o_modtype[2];   /* module type (??) */
  59  unsigned char o_cputype[2];   /* cpu type */
  60  unsigned char o_maxstack[4];  /* max stack size (??) */
  61  unsigned char o_maxdata[4];   /* max data size (??) */
  62  unsigned char o_resv2[12];    /* reserved */
  63}
  64AOUTHDR;
  65
  66#define AOUTSZ 72
  67#define SMALL_AOUTSZ (28)
  68#define AOUTHDRSZ 72
  69
  70#define RS6K_AOUTHDR_OMAGIC     0x0107  /* old: text & data writeable */
  71#define RS6K_AOUTHDR_NMAGIC     0x0108  /* new: text r/o, data r/w */
  72#define RS6K_AOUTHDR_ZMAGIC     0x010B  /* paged: text r/o, both page-aligned */
  73
  74
  75/********************** SECTION HEADER **********************/
  76
  77
  78struct external_scnhdr {
  79        char            s_name[8];      /* section name                 */
  80        char            s_paddr[4];     /* physical address, aliased s_nlib */
  81        char            s_vaddr[4];     /* virtual address              */
  82        char            s_size[4];      /* section size                 */
  83        char            s_scnptr[4];    /* file ptr to raw data for section */
  84        char            s_relptr[4];    /* file ptr to relocation       */
  85        char            s_lnnoptr[4];   /* file ptr to line numbers     */
  86        char            s_nreloc[2];    /* number of relocation entries */
  87        char            s_nlnno[2];     /* number of line number entries*/
  88        char            s_flags[4];     /* flags                        */
  89};
  90
  91/*
  92 * names of "special" sections
  93 */
  94#define _TEXT   ".text"
  95#define _DATA   ".data"
  96#define _BSS    ".bss"
  97#define _PAD    ".pad"
  98#define _LOADER ".loader"
  99
 100#define SCNHDR  struct external_scnhdr
 101#define SCNHSZ  40
 102
 103/* XCOFF uses a special .loader section with type STYP_LOADER.  */
 104#define STYP_LOADER 0x1000
 105
 106/* XCOFF uses a special .debug section with type STYP_DEBUG.  */
 107#define STYP_DEBUG 0x2000
 108
 109/* XCOFF handles line number or relocation overflow by creating
 110   another section header with STYP_OVRFLO set.  */
 111#define STYP_OVRFLO 0x8000
 112
 113/********************** LINE NUMBERS **********************/
 114
 115/* 1 line number entry for every "breakpointable" source line in a section.
 116 * Line numbers are grouped on a per function basis; first entry in a function
 117 * grouping will have l_lnno = 0 and in place of physical address will be the
 118 * symbol table index of the function name.
 119 */
 120struct external_lineno {
 121        union {
 122                char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
 123                char l_paddr[4];        /* (physical) address of line number    */
 124        } l_addr;
 125        char l_lnno[2]; /* line number          */
 126};
 127
 128
 129#define LINENO  struct external_lineno
 130#define LINESZ  6
 131
 132
 133/********************** SYMBOLS **********************/
 134
 135#define E_SYMNMLEN      8       /* # characters in a symbol name        */
 136#define E_FILNMLEN      14      /* # characters in a file name          */
 137#define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 138
 139struct external_syment
 140{
 141  union {
 142    char e_name[E_SYMNMLEN];
 143    struct {
 144      char e_zeroes[4];
 145      char e_offset[4];
 146    } e;
 147  } e;
 148  char e_value[4];
 149  char e_scnum[2];
 150  char e_type[2];
 151  char e_sclass[1];
 152  char e_numaux[1];
 153};
 154
 155
 156
 157#define N_BTMASK        (017)
 158#define N_TMASK         (060)
 159#define N_BTSHFT        (4)
 160#define N_TSHIFT        (2)
 161
 162
 163union external_auxent {
 164        struct {
 165                char x_tagndx[4];       /* str, un, or enum tag indx */
 166                union {
 167                        struct {
 168                            char  x_lnno[2]; /* declaration line number */
 169                            char  x_size[2]; /* str/union/array size */
 170                        } x_lnsz;
 171                        char x_fsize[4];        /* size of function */
 172                } x_misc;
 173                union {
 174                        struct {                /* if ISFCN, tag, or .bb */
 175                            char x_lnnoptr[4];  /* ptr to fcn line # */
 176                            char x_endndx[4];   /* entry ndx past block end */
 177                        } x_fcn;
 178                        struct {                /* if ISARY, up to 4 dimen. */
 179                            char x_dimen[E_DIMNUM][2];
 180                        } x_ary;
 181                } x_fcnary;
 182                char x_tvndx[2];                /* tv index */
 183        } x_sym;
 184
 185        union {
 186                char x_fname[E_FILNMLEN];
 187                struct {
 188                        char x_zeroes[4];
 189                        char x_offset[4];
 190                } x_n;
 191        } x_file;
 192
 193        struct {
 194                char x_scnlen[4];                       /* section length */
 195                char x_nreloc[2];       /* # relocation entries */
 196                char x_nlinno[2];       /* # line numbers */
 197        } x_scn;
 198
 199        struct {
 200                char x_tvfill[4];       /* tv fill value */
 201                char x_tvlen[2];        /* length of .tv */
 202                char x_tvran[2][2];     /* tv range */
 203        } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
 204
 205        struct {
 206                unsigned char x_scnlen[4];
 207                unsigned char x_parmhash[4];
 208                unsigned char x_snhash[2];
 209                unsigned char x_smtyp[1];
 210                unsigned char x_smclas[1];
 211                unsigned char x_stab[4];
 212                unsigned char x_snstab[2];
 213        } x_csect;
 214
 215};
 216
 217#define SYMENT  struct external_syment
 218#define SYMESZ  18
 219#define AUXENT  union external_auxent
 220#define AUXESZ  18
 221#define DBXMASK 0x80            /* for dbx storage mask */
 222#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
 223
 224
 225
 226/********************** RELOCATION DIRECTIVES **********************/
 227
 228
 229struct external_reloc {
 230  char r_vaddr[4];
 231  char r_symndx[4];
 232  char r_size[1];
 233  char r_type[1];
 234};
 235
 236
 237#define RELOC struct external_reloc
 238#define RELSZ 10
 239
 240#define DEFAULT_DATA_SECTION_ALIGNMENT 4
 241#define DEFAULT_BSS_SECTION_ALIGNMENT 4
 242#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
 243/* For new sections we haven't heard of before */
 244#define DEFAULT_SECTION_ALIGNMENT 4
 245