1/* 2 * BK Id: SCCS/s.rs6000.h 1.7 05/18/01 15:17:23 cort 3 */ 4 5/********************** FILE HEADER **********************/ 6 7struct external_filehdr { 8 char f_magic[2]; /* magic number */ 9 char f_nscns[2]; /* number of sections */ 10 char f_timdat[4]; /* time & date stamp */ 11 char f_symptr[4]; /* file pointer to symtab */ 12 char f_nsyms[4]; /* number of symtab entries */ 13 char f_opthdr[2]; /* sizeof(optional hdr) */ 14 char f_flags[2]; /* flags */ 15}; 16 17 /* IBM RS/6000 */ 18#define U802WRMAGIC 0730 /* writeable text segments **chh** */ 19#define U802ROMAGIC 0735 /* readonly sharable text segments */ 20#define U802TOCMAGIC 0737 /* readonly text segments and TOC */ 21 22#define BADMAG(x) \ 23 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \ 24 (x).f_magic != U802TOCMAGIC) 25 26#define FILHDR struct external_filehdr 27#define FILHSZ 20 28 29 30/********************** AOUT "OPTIONAL HEADER" **********************/ 31 32 33typedef struct 34{ 35 unsigned char magic[2]; /* type of file */ 36 unsigned char vstamp[2]; /* version stamp */ 37 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */ 38 unsigned char dsize[4]; /* initialized data " " */ 39 unsigned char bsize[4]; /* uninitialized data " " */ 40 unsigned char entry[4]; /* entry pt. */ 41 unsigned char text_start[4]; /* base of text used for this file */ 42 unsigned char data_start[4]; /* base of data used for this file */ 43 unsigned char o_toc[4]; /* address of TOC */ 44 unsigned char o_snentry[2]; /* section number of entry point */ 45 unsigned char o_sntext[2]; /* section number of .text section */ 46 unsigned char o_sndata[2]; /* section number of .data section */ 47 unsigned char o_sntoc[2]; /* section number of TOC */ 48 unsigned char o_snloader[2]; /* section number of .loader section */ 49 unsigned char o_snbss[2]; /* section number of .bss section */ 50 unsigned char o_algntext[2]; /* .text alignment */ 51 unsigned char o_algndata[2]; /* .data alignment */ 52 unsigned char o_modtype[2]; /* module type (??) */ 53 unsigned char o_cputype[2]; /* cpu type */ 54 unsigned char o_maxstack[4]; /* max stack size (??) */ 55 unsigned char o_maxdata[4]; /* max data size (??) */ 56 unsigned char o_resv2[12]; /* reserved */ 57} 58AOUTHDR; 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 72struct 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 */ 114struct 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 133struct external_syment 134{ 135 union { 136 char e_name[E_SYMNMLEN]; 137 struct { 138 char e_zeroes[4]; 139 char e_offset[4]; 140 } e; 141 } e; 142 char e_value[4]; 143 char e_scnum[2]; 144 char e_type[2]; 145 char e_sclass[1]; 146 char e_numaux[1]; 147}; 148 149 150 151#define N_BTMASK (017) 152#define N_TMASK (060) 153#define N_BTSHFT (4) 154#define N_TSHIFT (2) 155 156 157union external_auxent { 158 struct { 159 char x_tagndx[4]; /* str, un, or enum tag indx */ 160 union { 161 struct { 162 char x_lnno[2]; /* declaration line number */ 163 char x_size[2]; /* str/union/array size */ 164 } x_lnsz; 165 char x_fsize[4]; /* size of function */ 166 } x_misc; 167 union { 168 struct { /* if ISFCN, tag, or .bb */ 169 char x_lnnoptr[4]; /* ptr to fcn line # */ 170 char x_endndx[4]; /* entry ndx past block end */ 171 } x_fcn; 172 struct { /* if ISARY, up to 4 dimen. */ 173 char x_dimen[E_DIMNUM][2]; 174 } x_ary; 175 } x_fcnary; 176 char x_tvndx[2]; /* tv index */ 177 } x_sym; 178 179 union { 180 char x_fname[E_FILNMLEN]; 181 struct { 182 char x_zeroes[4]; 183 char x_offset[4]; 184 } x_n; 185 } x_file; 186 187 struct { 188 char x_scnlen[4]; /* section length */ 189 char x_nreloc[2]; /* # relocation entries */ 190 char x_nlinno[2]; /* # line numbers */ 191 } x_scn; 192 193 struct { 194 char x_tvfill[4]; /* tv fill value */ 195 char x_tvlen[2]; /* length of .tv */ 196 char x_tvran[2][2]; /* tv range */ 197 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */ 198 199 struct { 200 unsigned char x_scnlen[4]; 201 unsigned char x_parmhash[4]; 202 unsigned char x_snhash[2]; 203 unsigned char x_smtyp[1]; 204 unsigned char x_smclas[1]; 205 unsigned char x_stab[4]; 206 unsigned char x_snstab[2]; 207 } x_csect; 208 209}; 210 211#define SYMENT struct external_syment 212#define SYMESZ 18 213#define AUXENT union external_auxent 214#define AUXESZ 18 215#define DBXMASK 0x80 /* for dbx storage mask */ 216#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK) 217 218 219 220/********************** RELOCATION DIRECTIVES **********************/ 221 222 223struct external_reloc { 224 char r_vaddr[4]; 225 char r_symndx[4]; 226 char r_size[1]; 227 char r_type[1]; 228}; 229 230 231#define RELOC struct external_reloc 232#define RELSZ 10 233 234#define DEFAULT_DATA_SECTION_ALIGNMENT 4 235#define DEFAULT_BSS_SECTION_ALIGNMENT 4 236#define DEFAULT_TEXT_SECTION_ALIGNMENT 4 237/* For new sections we havn't heard of before */ 238#define DEFAULT_SECTION_ALIGNMENT 4 239