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 struct aouthdr { 36 unsigned char magic[2]; /* type of file */ 37 unsigned char vstamp[2]; /* version stamp */ 38 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */ 39 unsigned char dsize[4]; /* initialized data " " */ 40 unsigned char bsize[4]; /* uninitialized data " " */ 41 unsigned char entry[4]; /* entry pt. */ 42 unsigned char text_start[4]; /* base of text used for this file */ 43 unsigned char data_start[4]; /* base of data used for this file */ 44 unsigned char o_toc[4]; /* address of TOC */ 45 unsigned char o_snentry[2]; /* section number of entry point */ 46 unsigned char o_sntext[2]; /* section number of .text section */ 47 unsigned char o_sndata[2]; /* section number of .data section */ 48 unsigned char o_sntoc[2]; /* section number of TOC */ 49 unsigned char o_snloader[2]; /* section number of .loader section */ 50 unsigned char o_snbss[2]; /* section number of .bss section */ 51 unsigned char o_algntext[2]; /* .text alignment */ 52 unsigned char o_algndata[2]; /* .data alignment */ 53 unsigned char o_modtype[2]; /* module type (??) */ 54 unsigned char o_cputype[2]; /* cpu type */ 55 unsigned char o_maxstack[4]; /* max stack size (??) */ 56 unsigned char o_maxdata[4]; /* max data size (??) */ 57 unsigned char o_resv2[12]; /* reserved */ 58 }; 59 60 #define AOUTSZ 72 61 #define SMALL_AOUTSZ (28) 62 #define AOUTHDRSZ 72 63 64 #define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */ 65 #define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */ 66 #define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */ 67 68 69 /********************** SECTION HEADER **********************/ 70 71 72 struct external_scnhdr { 73 char s_name[8]; /* section name */ 74 char s_paddr[4]; /* physical address, aliased s_nlib */ 75 char s_vaddr[4]; /* virtual address */ 76 char s_size[4]; /* section size */ 77 char s_scnptr[4]; /* file ptr to raw data for section */ 78 char s_relptr[4]; /* file ptr to relocation */ 79 char s_lnnoptr[4]; /* file ptr to line numbers */ 80 char s_nreloc[2]; /* number of relocation entries */ 81 char s_nlnno[2]; /* number of line number entries*/ 82 char s_flags[4]; /* flags */ 83 }; 84 85 /* 86 * names of "special" sections 87 */ 88 #define _TEXT ".text" 89 #define _DATA ".data" 90 #define _BSS ".bss" 91 #define _PAD ".pad" 92 #define _LOADER ".loader" 93 94 #define SCNHDR struct external_scnhdr 95 #define SCNHSZ 40 96 97 /* XCOFF uses a special .loader section with type STYP_LOADER. */ 98 #define STYP_LOADER 0x1000 99 100 /* XCOFF uses a special .debug section with type STYP_DEBUG. */ 101 #define STYP_DEBUG 0x2000 102 103 /* XCOFF handles line number or relocation overflow by creating 104 another section header with STYP_OVRFLO set. */ 105 #define STYP_OVRFLO 0x8000 106 107 /********************** LINE NUMBERS **********************/ 108 109 /* 1 line number entry for every "breakpointable" source line in a section. 110 * Line numbers are grouped on a per function basis; first entry in a function 111 * grouping will have l_lnno = 0 and in place of physical address will be the 112 * symbol table index of the function name. 113 */ 114 struct external_lineno { 115 union { 116 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0 */ 117 char l_paddr[4]; /* (physical) address of line number */ 118 } l_addr; 119 char l_lnno[2]; /* line number */ 120 }; 121 122 123 #define LINENO struct external_lineno 124 #define LINESZ 6 125 126 127 /********************** SYMBOLS **********************/ 128 129 #define E_SYMNMLEN 8 /* # characters in a symbol name */ 130 #define E_FILNMLEN 14 /* # characters in a file name */ 131 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */ 132 133 struct external_syment { 134 union { 135 char e_name[E_SYMNMLEN]; 136 struct { 137 char e_zeroes[4]; 138 char e_offset[4]; 139 } e; 140 } e; 141 char e_value[4]; 142 char e_scnum[2]; 143 char e_type[2]; 144 char e_sclass[1]; 145 char e_numaux[1]; 146 }; 147 148 149 150 #define N_BTMASK (017) 151 #define N_TMASK (060) 152 #define N_BTSHFT (4) 153 #define N_TSHIFT (2) 154 155 156 union external_auxent { 157 struct { 158 char x_tagndx[4]; /* str, un, or enum tag indx */ 159 union { 160 struct { 161 char x_lnno[2]; /* declaration line number */ 162 char x_size[2]; /* str/union/array size */ 163 } x_lnsz; 164 char x_fsize[4]; /* size of function */ 165 } x_misc; 166 union { 167 struct { /* if ISFCN, tag, or .bb */ 168 char x_lnnoptr[4]; /* ptr to fcn line # */ 169 char x_endndx[4]; /* entry ndx past block end */ 170 } x_fcn; 171 struct { /* if ISARY, up to 4 dimen. */ 172 char x_dimen[E_DIMNUM][2]; 173 } x_ary; 174 } x_fcnary; 175 char x_tvndx[2]; /* tv index */ 176 } x_sym; 177 178 union { 179 char x_fname[E_FILNMLEN]; 180 struct { 181 char x_zeroes[4]; 182 char x_offset[4]; 183 } x_n; 184 } x_file; 185 186 struct { 187 char x_scnlen[4]; /* section length */ 188 char x_nreloc[2]; /* # relocation entries */ 189 char x_nlinno[2]; /* # line numbers */ 190 } x_scn; 191 192 struct { 193 char x_tvfill[4]; /* tv fill value */ 194 char x_tvlen[2]; /* length of .tv */ 195 char x_tvran[2][2]; /* tv range */ 196 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */ 197 198 struct { 199 unsigned char x_scnlen[4]; 200 unsigned char x_parmhash[4]; 201 unsigned char x_snhash[2]; 202 unsigned char x_smtyp[1]; 203 unsigned char x_smclas[1]; 204 unsigned char x_stab[4]; 205 unsigned char x_snstab[2]; 206 } x_csect; 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 haven't heard of before */ 236 #define DEFAULT_SECTION_ALIGNMENT 4 237