1 2 3/********************** FILE HEADER **********************/ 4 5struct 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 31typedef 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} 56AOUTHDR; 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 70struct 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 */ 112struct 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 131struct 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 155union 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 221struct 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 4 237