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 Written by Mimi Phuong-Thao Vo of IBM 5 and John Gilmore of Cygnus Support. */ 6 7 /********************** FILE HEADER **********************/ 8 9 struct external_filehdr { 10 char f_magic[2]; /* magic number */ 11 char f_nscns[2]; /* number of sections */ 12 char f_timdat[4]; /* time & date stamp */ 13 char f_symptr[4]; /* file pointer to symtab */ 14 char f_nsyms[4]; /* number of symtab entries */ 15 char f_opthdr[2]; /* sizeof(optional hdr) */ 16 char f_flags[2]; /* flags */ 17 }; 18 19 /* IBM RS/6000 */ 20 #define U802WRMAGIC 0730 /* writeable text segments **chh** */ 21 #define U802ROMAGIC 0735 /* readonly sharable text segments */ 22 #define U802TOCMAGIC 0737 /* readonly text segments and TOC */ 23 24 #define BADMAG(x) \ 25 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \ 26 (x).f_magic != U802TOCMAGIC) 27 28 #define FILHDR struct external_filehdr 29 #define FILHSZ 20 30 31 32 /********************** AOUT "OPTIONAL HEADER" **********************/ 33 34 35 typedef struct 36 { 37 unsigned char magic[2]; /* type of file */ 38 unsigned char vstamp[2]; /* version stamp */ 39 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */ 40 unsigned char dsize[4]; /* initialized data " " */ 41 unsigned char bsize[4]; /* uninitialized data " " */ 42 unsigned char entry[4]; /* entry pt. */ 43 unsigned char text_start[4]; /* base of text used for this file */ 44 unsigned char data_start[4]; /* base of data used for this file */ 45 unsigned char o_toc[4]; /* address of TOC */ 46 unsigned char o_snentry[2]; /* section number of entry point */ 47 unsigned char o_sntext[2]; /* section number of .text section */ 48 unsigned char o_sndata[2]; /* section number of .data section */ 49 unsigned char o_sntoc[2]; /* section number of TOC */ 50 unsigned char o_snloader[2]; /* section number of .loader section */ 51 unsigned char o_snbss[2]; /* section number of .bss section */ 52 unsigned char o_algntext[2]; /* .text alignment */ 53 unsigned char o_algndata[2]; /* .data alignment */ 54 unsigned char o_modtype[2]; /* module type (??) */ 55 unsigned char o_cputype[2]; /* cpu type */ 56 unsigned char o_maxstack[4]; /* max stack size (??) */ 57 unsigned char o_maxdata[4]; /* max data size (??) */ 58 unsigned char o_resv2[12]; /* reserved */ 59 } 60 AOUTHDR; 61 62 #define AOUTSZ 72 63 #define SMALL_AOUTSZ (28) 64 #define AOUTHDRSZ 72 65 66 #define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */ 67 #define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */ 68 #define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */ 69 70 71 /********************** SECTION HEADER **********************/ 72 73 74 struct external_scnhdr { 75 char s_name[8]; /* section name */ 76 char s_paddr[4]; /* physical address, aliased s_nlib */ 77 char s_vaddr[4]; /* virtual address */ 78 char s_size[4]; /* section size */ 79 char s_scnptr[4]; /* file ptr to raw data for section */ 80 char s_relptr[4]; /* file ptr to relocation */ 81 char s_lnnoptr[4]; /* file ptr to line numbers */ 82 char s_nreloc[2]; /* number of relocation entries */ 83 char s_nlnno[2]; /* number of line number entries*/ 84 char s_flags[4]; /* flags */ 85 }; 86 87 /* 88 * names of "special" sections 89 */ 90 #define _TEXT ".text" 91 #define _DATA ".data" 92 #define _BSS ".bss" 93 #define _PAD ".pad" 94 #define _LOADER ".loader" 95 96 #define SCNHDR struct external_scnhdr 97 #define SCNHSZ 40 98 99 /* XCOFF uses a special .loader section with type STYP_LOADER. */ 100 #define STYP_LOADER 0x1000 101 102 /* XCOFF uses a special .debug section with type STYP_DEBUG. */ 103 #define STYP_DEBUG 0x2000 104 105 /* XCOFF handles line number or relocation overflow by creating 106 another section header with STYP_OVRFLO set. */ 107 #define STYP_OVRFLO 0x8000 108 109 /********************** LINE NUMBERS **********************/ 110 111 /* 1 line number entry for every "breakpointable" source line in a section. 112 * Line numbers are grouped on a per function basis; first entry in a function 113 * grouping will have l_lnno = 0 and in place of physical address will be the 114 * symbol table index of the function name. 115 */ 116 struct external_lineno { 117 union { 118 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/ 119 char l_paddr[4]; /* (physical) address of line number */ 120 } l_addr; 121 char l_lnno[2]; /* line number */ 122 }; 123 124 125 #define LINENO struct external_lineno 126 #define LINESZ 6 127 128 129 /********************** SYMBOLS **********************/ 130 131 #define E_SYMNMLEN 8 /* # characters in a symbol name */ 132 #define E_FILNMLEN 14 /* # characters in a file name */ 133 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */ 134 135 struct external_syment 136 { 137 union { 138 char e_name[E_SYMNMLEN]; 139 struct { 140 char e_zeroes[4]; 141 char e_offset[4]; 142 } e; 143 } e; 144 char e_value[4]; 145 char e_scnum[2]; 146 char e_type[2]; 147 char e_sclass[1]; 148 char e_numaux[1]; 149 }; 150 151 152 153 #define N_BTMASK (017) 154 #define N_TMASK (060) 155 #define N_BTSHFT (4) 156 #define N_TSHIFT (2) 157 158 159 union external_auxent { 160 struct { 161 char x_tagndx[4]; /* str, un, or enum tag indx */ 162 union { 163 struct { 164 char x_lnno[2]; /* declaration line number */ 165 char x_size[2]; /* str/union/array size */ 166 } x_lnsz; 167 char x_fsize[4]; /* size of function */ 168 } x_misc; 169 union { 170 struct { /* if ISFCN, tag, or .bb */ 171 char x_lnnoptr[4]; /* ptr to fcn line # */ 172 char x_endndx[4]; /* entry ndx past block end */ 173 } x_fcn; 174 struct { /* if ISARY, up to 4 dimen. */ 175 char x_dimen[E_DIMNUM][2]; 176 } x_ary; 177 } x_fcnary; 178 char x_tvndx[2]; /* tv index */ 179 } x_sym; 180 181 union { 182 char x_fname[E_FILNMLEN]; 183 struct { 184 char x_zeroes[4]; 185 char x_offset[4]; 186 } x_n; 187 } x_file; 188 189 struct { 190 char x_scnlen[4]; /* section length */ 191 char x_nreloc[2]; /* # relocation entries */ 192 char x_nlinno[2]; /* # line numbers */ 193 } x_scn; 194 195 struct { 196 char x_tvfill[4]; /* tv fill value */ 197 char x_tvlen[2]; /* length of .tv */ 198 char x_tvran[2][2]; /* tv range */ 199 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */ 200 201 struct { 202 unsigned char x_scnlen[4]; 203 unsigned char x_parmhash[4]; 204 unsigned char x_snhash[2]; 205 unsigned char x_smtyp[1]; 206 unsigned char x_smclas[1]; 207 unsigned char x_stab[4]; 208 unsigned char x_snstab[2]; 209 } x_csect; 210 211 }; 212 213 #define SYMENT struct external_syment 214 #define SYMESZ 18 215 #define AUXENT union external_auxent 216 #define AUXESZ 18 217 #define DBXMASK 0x80 /* for dbx storage mask */ 218 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK) 219 220 221 222 /********************** RELOCATION DIRECTIVES **********************/ 223 224 225 struct external_reloc { 226 char r_vaddr[4]; 227 char r_symndx[4]; 228 char r_size[1]; 229 char r_type[1]; 230 }; 231 232 233 #define RELOC struct external_reloc 234 #define RELSZ 10 235 236 #define DEFAULT_DATA_SECTION_ALIGNMENT 4 237 #define DEFAULT_BSS_SECTION_ALIGNMENT 4 238 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4 239 /* For new sections we haven't heard of before */ 240 #define DEFAULT_SECTION_ALIGNMENT 4 241