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 13 struct 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 39 typedef 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 } 64 AOUTHDR; 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 78 struct 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 */ 120 struct 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 */ 138 139 struct 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) 161 162 163 union 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 **********************/ 227 228 229 struct 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