1 /* ECOFF support on MIPS machines. 2 coff/ecoff.h must be included before this file. */ 3 4 /********************** FILE HEADER **********************/ 5 6 struct external_filehdr { 7 unsigned char f_magic[2]; /* magic number */ 8 unsigned char f_nscns[2]; /* number of sections */ 9 unsigned char f_timdat[4]; /* time & date stamp */ 10 unsigned char f_symptr[4]; /* file pointer to symtab */ 11 unsigned char f_nsyms[4]; /* number of symtab entries */ 12 unsigned char f_opthdr[2]; /* sizeof(optional hdr) */ 13 unsigned char f_flags[2]; /* flags */ 14 }; 15 16 /* Magic numbers are defined in coff/ecoff.h. */ 17 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \ 18 ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\ 19 ((x).f_magic!=MIPS_MAGIC_BIG) && \ 20 ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \ 21 ((x).f_magic!=MIPS_MAGIC_BIG2) && \ 22 ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \ 23 ((x).f_magic!=MIPS_MAGIC_BIG3)) 24 25 #define FILHDR struct external_filehdr 26 #define FILHSZ 20 27 28 /********************** AOUT "OPTIONAL HEADER" **********************/ 29 30 31 typedef struct external_aouthdr 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 bss_start[4]; /* base of bss used for this file */ 42 unsigned char gprmask[4]; /* ?? */ 43 unsigned char cprmask[4][4]; /* ?? */ 44 unsigned char gp_value[4]; /* value for gp register */ 45 } AOUTHDR; 46 47 /* compute size of a header */ 48 49 #define AOUTSZ 56 50 #define AOUTHDRSZ 56 51 52 /********************** SECTION HEADER **********************/ 53 54 struct external_scnhdr { 55 unsigned char s_name[8]; /* section name */ 56 unsigned char s_paddr[4]; /* physical address, aliased s_nlib */ 57 unsigned char s_vaddr[4]; /* virtual address */ 58 unsigned char s_size[4]; /* section size */ 59 unsigned char s_scnptr[4]; /* file ptr to raw data for section */ 60 unsigned char s_relptr[4]; /* file ptr to relocation */ 61 unsigned char s_lnnoptr[4]; /* file ptr to line numbers */ 62 unsigned char s_nreloc[2]; /* number of relocation entries */ 63 unsigned char s_nlnno[2]; /* number of line number entries*/ 64 unsigned char s_flags[4]; /* flags */ 65 }; 66 67 #define SCNHDR struct external_scnhdr 68 #define SCNHSZ 40 69 70 /********************** RELOCATION DIRECTIVES **********************/ 71 72 struct external_reloc { 73 unsigned char r_vaddr[4]; 74 unsigned char r_bits[4]; 75 }; 76 77 #define RELOC struct external_reloc 78 #define RELSZ 8 79 80 /* MIPS ECOFF uses a packed 8 byte format for relocs. These constants 81 are used to unpack the r_bits field. */ 82 83 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG 16 84 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE 0 85 86 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG 8 87 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE 8 88 89 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG 0 90 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE 16 91 92 /* Originally, ECOFF used four bits for the reloc type and had three 93 reserved bits. Irix 4 added another bit for the reloc type, which 94 was easy because it was big endian and one of the spare bits became 95 the new most significant bit. To make this also work for little 96 endian ECOFF, we need to wrap one of the reserved bits around to 97 become the most significant bit of the reloc type. */ 98 #define RELOC_BITS3_TYPE_BIG 0x3E 99 #define RELOC_BITS3_TYPE_SH_BIG 1 100 #define RELOC_BITS3_TYPE_LITTLE 0x78 101 #define RELOC_BITS3_TYPE_SH_LITTLE 3 102 #define RELOC_BITS3_TYPEHI_LITTLE 0x04 103 #define RELOC_BITS3_TYPEHI_SH_LITTLE 2 104 105 #define RELOC_BITS3_EXTERN_BIG 0x01 106 #define RELOC_BITS3_EXTERN_LITTLE 0x80 107 108 /* The r_type field in a reloc is one of the following values. I 109 don't know if any other values can appear. These seem to be all 110 that occur in the Ultrix 4.2 libraries. */ 111 #define MIPS_R_IGNORE 0 112 #define MIPS_R_REFHALF 1 113 #define MIPS_R_REFWORD 2 114 #define MIPS_R_JMPADDR 3 115 #define MIPS_R_REFHI 4 116 #define MIPS_R_REFLO 5 117 #define MIPS_R_GPREL 6 118 #define MIPS_R_LITERAL 7 119 120 /* These reloc types are a Cygnus extension used when generating 121 position independent code for embedded systems. The numbers are 122 taken from Irix 4, but at least for internal relocs Irix 5 does not 123 give them the same meaning. For an internal reloc the symbol index 124 of RELHI and RELLO is modified as described below for 125 MIPS_R_SWITCH. */ 126 #define MIPS_R_PCREL16 12 127 #define MIPS_R_RELHI 13 128 #define MIPS_R_RELLO 14 129 130 /* This reloc type is a Cygnus extension used when generating position 131 independent code for embedded systems. It is used for an entry in 132 a switch table, which looks like this: 133 .word $L3-$LS12 134 The object file will contain the correct difference, and does not 135 require adjustment. However, when the linker is relaxing PC 136 relative calls, it is possible for $L3 to move farther away. This 137 reloc always appears in the .text section, and is always against 138 the .text section. However, the symbol index is not 139 RELOC_SECTION_TEXT. It is, instead, the distance between this 140 switch table entry and $LS12. Thus, the original value of $L12 is 141 vaddr - symndx 142 and the original value of $L3 is 143 vaddr - symndx + addend 144 where addend is the value in the object file. Knowing this, the 145 linker can know whether the addend in the object file must be 146 adjusted. */ 147 #define MIPS_R_SWITCH 22 148 149 /********************** STABS **********************/ 150 151 #define MIPS_IS_STAB ECOFF_IS_STAB 152 #define MIPS_MARK_STAB ECOFF_MARK_STAB 153 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB 154 155 /********************** SYMBOLIC INFORMATION **********************/ 156 157 /* Written by John Gilmore. */ 158 159 /* ECOFF uses COFF-like section structures, but its own symbol format. 160 This file defines the symbol format in fields whose size and alignment 161 will not vary on different host systems. */ 162 163 /* File header as a set of bytes */ 164 165 struct hdr_ext { 166 unsigned char h_magic[2]; 167 unsigned char h_vstamp[2]; 168 unsigned char h_ilineMax[4]; 169 unsigned char h_cbLine[4]; 170 unsigned char h_cbLineOffset[4]; 171 unsigned char h_idnMax[4]; 172 unsigned char h_cbDnOffset[4]; 173 unsigned char h_ipdMax[4]; 174 unsigned char h_cbPdOffset[4]; 175 unsigned char h_isymMax[4]; 176 unsigned char h_cbSymOffset[4]; 177 unsigned char h_ioptMax[4]; 178 unsigned char h_cbOptOffset[4]; 179 unsigned char h_iauxMax[4]; 180 unsigned char h_cbAuxOffset[4]; 181 unsigned char h_issMax[4]; 182 unsigned char h_cbSsOffset[4]; 183 unsigned char h_issExtMax[4]; 184 unsigned char h_cbSsExtOffset[4]; 185 unsigned char h_ifdMax[4]; 186 unsigned char h_cbFdOffset[4]; 187 unsigned char h_crfd[4]; 188 unsigned char h_cbRfdOffset[4]; 189 unsigned char h_iextMax[4]; 190 unsigned char h_cbExtOffset[4]; 191 }; 192 193 /* File descriptor external record */ 194 195 struct fdr_ext { 196 unsigned char f_adr[4]; 197 unsigned char f_rss[4]; 198 unsigned char f_issBase[4]; 199 unsigned char f_cbSs[4]; 200 unsigned char f_isymBase[4]; 201 unsigned char f_csym[4]; 202 unsigned char f_ilineBase[4]; 203 unsigned char f_cline[4]; 204 unsigned char f_ioptBase[4]; 205 unsigned char f_copt[4]; 206 unsigned char f_ipdFirst[2]; 207 unsigned char f_cpd[2]; 208 unsigned char f_iauxBase[4]; 209 unsigned char f_caux[4]; 210 unsigned char f_rfdBase[4]; 211 unsigned char f_crfd[4]; 212 unsigned char f_bits1[1]; 213 unsigned char f_bits2[3]; 214 unsigned char f_cbLineOffset[4]; 215 unsigned char f_cbLine[4]; 216 }; 217 218 #define FDR_BITS1_LANG_BIG 0xF8 219 #define FDR_BITS1_LANG_SH_BIG 3 220 #define FDR_BITS1_LANG_LITTLE 0x1F 221 #define FDR_BITS1_LANG_SH_LITTLE 0 222 223 #define FDR_BITS1_FMERGE_BIG 0x04 224 #define FDR_BITS1_FMERGE_LITTLE 0x20 225 226 #define FDR_BITS1_FREADIN_BIG 0x02 227 #define FDR_BITS1_FREADIN_LITTLE 0x40 228 229 #define FDR_BITS1_FBIGENDIAN_BIG 0x01 230 #define FDR_BITS1_FBIGENDIAN_LITTLE 0x80 231 232 #define FDR_BITS2_GLEVEL_BIG 0xC0 233 #define FDR_BITS2_GLEVEL_SH_BIG 6 234 #define FDR_BITS2_GLEVEL_LITTLE 0x03 235 #define FDR_BITS2_GLEVEL_SH_LITTLE 0 236 237 /* We ignore the `reserved' field in bits2. */ 238 239 /* Procedure descriptor external record */ 240 241 struct pdr_ext { 242 unsigned char p_adr[4]; 243 unsigned char p_isym[4]; 244 unsigned char p_iline[4]; 245 unsigned char p_regmask[4]; 246 unsigned char p_regoffset[4]; 247 unsigned char p_iopt[4]; 248 unsigned char p_fregmask[4]; 249 unsigned char p_fregoffset[4]; 250 unsigned char p_frameoffset[4]; 251 unsigned char p_framereg[2]; 252 unsigned char p_pcreg[2]; 253 unsigned char p_lnLow[4]; 254 unsigned char p_lnHigh[4]; 255 unsigned char p_cbLineOffset[4]; 256 }; 257 258 /* Runtime procedure table */ 259 260 struct rpdr_ext { 261 unsigned char p_adr[4]; 262 unsigned char p_regmask[4]; 263 unsigned char p_regoffset[4]; 264 unsigned char p_fregmask[4]; 265 unsigned char p_fregoffset[4]; 266 unsigned char p_frameoffset[4]; 267 unsigned char p_framereg[2]; 268 unsigned char p_pcreg[2]; 269 unsigned char p_irpss[4]; 270 unsigned char p_reserved[4]; 271 unsigned char p_exception_info[4]; 272 }; 273 274 /* Line numbers */ 275 276 struct line_ext { 277 unsigned char l_line[4]; 278 }; 279 280 /* Symbol external record */ 281 282 struct sym_ext { 283 unsigned char s_iss[4]; 284 unsigned char s_value[4]; 285 unsigned char s_bits1[1]; 286 unsigned char s_bits2[1]; 287 unsigned char s_bits3[1]; 288 unsigned char s_bits4[1]; 289 }; 290 291 #define SYM_BITS1_ST_BIG 0xFC 292 #define SYM_BITS1_ST_SH_BIG 2 293 #define SYM_BITS1_ST_LITTLE 0x3F 294 #define SYM_BITS1_ST_SH_LITTLE 0 295 296 #define SYM_BITS1_SC_BIG 0x03 297 #define SYM_BITS1_SC_SH_LEFT_BIG 3 298 #define SYM_BITS1_SC_LITTLE 0xC0 299 #define SYM_BITS1_SC_SH_LITTLE 6 300 301 #define SYM_BITS2_SC_BIG 0xE0 302 #define SYM_BITS2_SC_SH_BIG 5 303 #define SYM_BITS2_SC_LITTLE 0x07 304 #define SYM_BITS2_SC_SH_LEFT_LITTLE 2 305 306 #define SYM_BITS2_RESERVED_BIG 0x10 307 #define SYM_BITS2_RESERVED_LITTLE 0x08 308 309 #define SYM_BITS2_INDEX_BIG 0x0F 310 #define SYM_BITS2_INDEX_SH_LEFT_BIG 16 311 #define SYM_BITS2_INDEX_LITTLE 0xF0 312 #define SYM_BITS2_INDEX_SH_LITTLE 4 313 314 #define SYM_BITS3_INDEX_SH_LEFT_BIG 8 315 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE 4 316 317 #define SYM_BITS4_INDEX_SH_LEFT_BIG 0 318 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE 12 319 320 /* External symbol external record */ 321 322 struct ext_ext { 323 unsigned char es_bits1[1]; 324 unsigned char es_bits2[1]; 325 unsigned char es_ifd[2]; 326 struct sym_ext es_asym; 327 }; 328 329 #define EXT_BITS1_JMPTBL_BIG 0x80 330 #define EXT_BITS1_JMPTBL_LITTLE 0x01 331 332 #define EXT_BITS1_COBOL_MAIN_BIG 0x40 333 #define EXT_BITS1_COBOL_MAIN_LITTLE 0x02 334 335 #define EXT_BITS1_WEAKEXT_BIG 0x20 336 #define EXT_BITS1_WEAKEXT_LITTLE 0x04 337 338 /* Dense numbers external record */ 339 340 struct dnr_ext { 341 unsigned char d_rfd[4]; 342 unsigned char d_index[4]; 343 }; 344 345 /* Relative file descriptor */ 346 347 struct rfd_ext { 348 unsigned char rfd[4]; 349 }; 350 351 /* Optimizer symbol external record */ 352 353 struct opt_ext { 354 unsigned char o_bits1[1]; 355 unsigned char o_bits2[1]; 356 unsigned char o_bits3[1]; 357 unsigned char o_bits4[1]; 358 struct rndx_ext o_rndx; 359 unsigned char o_offset[4]; 360 }; 361 362 #define OPT_BITS2_VALUE_SH_LEFT_BIG 16 363 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE 0 364 365 #define OPT_BITS3_VALUE_SH_LEFT_BIG 8 366 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE 8 367 368 #define OPT_BITS4_VALUE_SH_LEFT_BIG 0 369 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE 16 370