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annotate lwasm/output.c @ 388:8991eb507d2d
Added missing arg-nonnull.h ??? file to repo
| author | lost@l-w.ca |
|---|---|
| date | Wed, 14 Jul 2010 20:17:57 -0600 |
| parents | a741d2e4869f |
| children | c94436adce83 |
| rev | line source |
|---|---|
| 339 | 1 /* |
| 2 output.c | |
| 374 | 3 Copyright © 2009, 2010 William Astle |
| 339 | 4 |
| 5 This file is part of LWASM. | |
| 6 | |
| 7 LWASM is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 | |
| 21 Contains the code for actually outputting the assembled code | |
| 22 */ | |
| 23 #include <config.h> | |
| 24 #include <errno.h> | |
| 25 #include <stdio.h> | |
| 26 #include <string.h> | |
| 27 #include <unistd.h> | |
| 374 | 28 |
| 29 #include <lw_alloc.h> | |
| 30 #include <lw_expr.h> | |
| 31 | |
| 339 | 32 #include "lwasm.h" |
| 33 | |
| 34 void write_code_raw(asmstate_t *as, FILE *of); | |
| 35 void write_code_decb(asmstate_t *as, FILE *of); | |
| 36 void write_code_rawrel(asmstate_t *as, FILE *of); | |
| 37 void write_code_obj(asmstate_t *as, FILE *of); | |
| 38 void write_code_os9(asmstate_t *as, FILE *of); | |
| 39 | |
| 40 // this prevents warnings about not using the return value of fwrite() | |
| 41 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0) | |
| 42 | |
| 374 | 43 void do_output(asmstate_t *as) |
| 339 | 44 { |
| 45 FILE *of; | |
| 46 | |
| 47 if (as -> errorcount > 0) | |
| 48 { | |
| 49 fprintf(stderr, "Not doing output due to assembly errors.\n"); | |
| 50 return; | |
| 51 } | |
| 52 | |
| 374 | 53 of = fopen(as -> output_file, "wb"); |
| 339 | 54 if (!of) |
| 55 { | |
| 374 | 56 fprintf(stderr, "Cannot open '%s' for output", as -> output_file); |
| 339 | 57 perror(""); |
| 58 return; | |
| 59 } | |
| 60 | |
| 374 | 61 switch (as -> output_format) |
| 339 | 62 { |
| 63 case OUTPUT_RAW: | |
| 64 write_code_raw(as, of); | |
| 65 break; | |
| 66 | |
| 67 case OUTPUT_DECB: | |
| 68 write_code_decb(as, of); | |
| 69 break; | |
| 70 | |
| 71 case OUTPUT_RAWREL: | |
| 72 write_code_rawrel(as, of); | |
| 73 break; | |
| 74 | |
| 75 case OUTPUT_OBJ: | |
| 76 write_code_obj(as, of); | |
| 77 break; | |
| 78 | |
| 79 case OUTPUT_OS9: | |
| 80 write_code_os9(as, of); | |
| 81 break; | |
| 82 | |
| 83 default: | |
| 84 fprintf(stderr, "BUG: unrecognized output format when generating output file\n"); | |
| 85 fclose(of); | |
| 374 | 86 unlink(as -> output_file); |
| 339 | 87 return; |
| 88 } | |
| 89 | |
| 90 fclose(of); | |
| 91 } | |
| 92 | |
| 93 /* | |
| 94 rawrel output treats an ORG directive as an offset from the start of the | |
| 95 file. Undefined results will occur if an ORG directive moves the output | |
| 96 pointer backward. This particular implementation uses "fseek" to handle | |
| 97 ORG requests and to skip over RMBs. | |
| 98 | |
| 99 This simple brain damanged method simply does an fseek before outputting | |
| 100 each instruction. | |
| 101 */ | |
| 102 void write_code_rawrel(asmstate_t *as, FILE *of) | |
| 103 { | |
| 374 | 104 line_t *cl; |
| 339 | 105 |
| 374 | 106 for (cl = as -> line_head; cl; cl = cl -> next) |
| 339 | 107 { |
| 374 | 108 if (cl -> outputl <= 0) |
| 339 | 109 continue; |
| 110 | |
| 374 | 111 fseek(of, lw_expr_intval(cl -> addr), SEEK_SET); |
| 112 writebytes(cl -> output, cl -> outputl, 1, of); | |
| 339 | 113 } |
| 114 } | |
| 115 | |
| 116 /* | |
| 117 raw merely writes all the bytes directly to the file as is. ORG is just a | |
| 118 reference for the assembler to handle absolute references. Multiple ORG | |
| 119 statements will produce mostly useless results | |
| 120 */ | |
| 121 void write_code_raw(asmstate_t *as, FILE *of) | |
| 122 { | |
| 374 | 123 line_t *cl; |
| 339 | 124 |
| 374 | 125 for (cl = as -> line_head; cl; cl = cl -> next) |
| 339 | 126 { |
| 374 | 127 if (cl -> len > 0 && cl -> outputl == 0) |
| 339 | 128 { |
| 129 int i; | |
| 374 | 130 for (i = 0; i < cl -> len; i++) |
| 339 | 131 writebytes("\0", 1, 1, of); |
| 132 continue; | |
| 133 } | |
| 374 | 134 else if (cl -> outputl > 0) |
| 135 writebytes(cl -> output, cl -> outputl, 1, of); | |
| 339 | 136 } |
| 137 } | |
| 138 | |
| 139 | |
| 140 /* | |
| 141 OS9 target also just writes all the bytes in order. No need for anything | |
| 142 else. | |
| 143 */ | |
| 144 void write_code_os9(asmstate_t *as, FILE *of) | |
| 145 { | |
| 374 | 146 line_t *cl; |
| 339 | 147 |
| 374 | 148 for (cl = as -> line_head; cl; cl = cl -> next) |
| 339 | 149 { |
| 150 if (cl -> inmod == 0) | |
| 151 continue; | |
| 374 | 152 if (cl -> len > 0 && cl -> outputl == 0) |
| 339 | 153 { |
| 154 int i; | |
| 374 | 155 for (i = 0; i < cl -> len; i++) |
| 339 | 156 writebytes("\0", 1, 1, of); |
| 157 continue; | |
| 158 } | |
| 374 | 159 else if (cl -> outputl > 0) |
| 160 writebytes(cl -> output, cl -> outputl, 1, of); | |
| 339 | 161 } |
| 162 } | |
| 163 | |
| 164 void write_code_decb(asmstate_t *as, FILE *of) | |
| 165 { | |
| 166 long preambloc; | |
| 374 | 167 line_t *cl; |
| 339 | 168 int blocklen = -1; |
| 169 int nextcalc = -1; | |
| 170 unsigned char outbuf[5]; | |
| 374 | 171 int caddr; |
| 339 | 172 |
| 374 | 173 for (cl = as -> line_head; cl; cl = cl -> next) |
| 339 | 174 { |
| 374 | 175 if (cl -> outputl < 0) |
| 339 | 176 continue; |
| 374 | 177 caddr = lw_expr_intval(cl -> addr); |
| 178 if (caddr != nextcalc && cl -> outputl > 0) | |
| 339 | 179 { |
| 180 // need preamble here | |
| 181 if (blocklen > 0) | |
| 182 { | |
| 183 // update previous preamble if needed | |
| 184 fseek(of, preambloc, SEEK_SET); | |
| 185 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 186 outbuf[1] = blocklen & 0xFF; | |
| 187 writebytes(outbuf, 2, 1, of); | |
| 188 fseek(of, 0, SEEK_END); | |
| 189 } | |
| 190 blocklen = 0; | |
| 374 | 191 nextcalc = caddr; |
| 339 | 192 outbuf[0] = 0x00; |
| 193 outbuf[1] = 0x00; | |
| 194 outbuf[2] = 0x00; | |
| 195 outbuf[3] = (nextcalc >> 8) & 0xFF; | |
| 196 outbuf[4] = nextcalc & 0xFF; | |
| 197 preambloc = ftell(of) + 1; | |
| 198 writebytes(outbuf, 5, 1, of); | |
| 199 } | |
| 374 | 200 nextcalc += cl -> outputl; |
| 201 writebytes(cl -> output, cl -> outputl, 1, of); | |
| 202 blocklen += cl -> outputl; | |
| 339 | 203 } |
| 204 if (blocklen > 0) | |
| 205 { | |
| 206 fseek(of, preambloc, SEEK_SET); | |
| 207 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 208 outbuf[1] = blocklen & 0xFF; | |
| 209 writebytes(outbuf, 2, 1, of); | |
| 210 fseek(of, 0, SEEK_END); | |
| 211 } | |
| 212 | |
| 213 // now write postamble | |
| 214 outbuf[0] = 0xFF; | |
| 215 outbuf[1] = 0x00; | |
| 216 outbuf[2] = 0x00; | |
| 217 outbuf[3] = (as -> execaddr >> 8) & 0xFF; | |
| 218 outbuf[4] = (as -> execaddr) & 0xFF; | |
| 219 writebytes(outbuf, 5, 1, of); | |
| 220 } | |
| 221 | |
| 222 void write_code_obj_sbadd(sectiontab_t *s, unsigned char b) | |
| 223 { | |
| 224 if (s -> oblen >= s -> obsize) | |
| 225 { | |
| 374 | 226 s -> obytes = lw_realloc(s -> obytes, s -> obsize + 128); |
| 339 | 227 s -> obsize += 128; |
| 228 } | |
| 229 s -> obytes[s -> oblen] = b; | |
| 230 s -> oblen += 1; | |
| 231 } | |
| 232 | |
| 376 | 233 |
| 234 int write_code_obj_expraux(lw_expr_t e, void *of) | |
| 235 { | |
| 236 int tt; | |
| 237 int v; | |
| 238 unsigned char buf[16]; | |
| 239 | |
| 240 tt = lw_expr_type(e); | |
| 241 | |
| 242 switch (tt) | |
| 243 { | |
| 244 case lw_expr_type_oper: | |
| 245 buf[0] = 0x04; | |
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246 switch (lw_expr_whichop(e)) |
| 376 | 247 { |
| 248 case lw_expr_oper_plus: | |
| 249 buf[1] = 0x01; | |
| 250 break; | |
| 251 | |
| 252 case lw_expr_oper_minus: | |
| 253 buf[1] = 0x02; | |
| 254 break; | |
| 255 | |
| 256 case lw_expr_oper_times: | |
| 257 buf[1] = 0x03; | |
| 258 break; | |
| 259 | |
| 260 case lw_expr_oper_divide: | |
| 261 buf[1] = 0x04; | |
| 262 break; | |
| 263 | |
| 264 case lw_expr_oper_mod: | |
| 265 buf[1] = 0x05; | |
| 266 break; | |
| 267 | |
| 268 case lw_expr_oper_intdiv: | |
| 269 buf[1] = 0x06; | |
| 270 break; | |
| 271 | |
| 272 case lw_expr_oper_bwand: | |
| 273 buf[1] = 0x07; | |
| 274 break; | |
| 275 | |
| 276 case lw_expr_oper_bwor: | |
| 277 buf[1] = 0x08; | |
| 278 break; | |
| 279 | |
| 280 case lw_expr_oper_bwxor: | |
| 281 buf[1] = 0x09; | |
| 282 break; | |
| 283 | |
| 284 case lw_expr_oper_and: | |
| 285 buf[1] = 0x0A; | |
| 286 break; | |
| 287 | |
| 288 case lw_expr_oper_or: | |
| 289 buf[1] = 0x0B; | |
| 290 break; | |
| 291 | |
| 292 case lw_expr_oper_neg: | |
| 293 buf[1] = 0x0C; | |
| 294 break; | |
| 295 | |
| 296 case lw_expr_oper_com: | |
| 297 buf[1] = 0x0D; | |
| 298 break; | |
| 299 | |
| 300 default: | |
| 301 buf[1] = 0xff; | |
| 302 } | |
| 303 writebytes(buf, 2, 1, of); | |
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304 return 0; |
| 376 | 305 |
| 306 case lw_expr_type_int: | |
| 307 v = lw_expr_intval(e); | |
| 308 buf[0] = 0x01; | |
| 309 buf[1] = (v >> 8) & 0xff; | |
| 310 buf[2] = v & 0xff; | |
| 311 writebytes(buf, 3, 1, of); | |
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312 return 0; |
| 376 | 313 |
| 314 case lw_expr_type_special: | |
| 315 v = lw_expr_specint(e); | |
| 316 switch (v) | |
| 317 { | |
| 318 case lwasm_expr_secbase: | |
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319 { |
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320 // replaced with a synthetic symbol |
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321 sectiontab_t *se; |
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322 se = lw_expr_specptr(e); |
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323 |
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324 writebytes("\x03\x02", 2, 1, of); |
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325 writebytes(se -> name, strlen(se -> name) + 1, 1, of); |
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326 return 0; |
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327 } |
| 376 | 328 case lwasm_expr_import: |
| 329 { | |
| 330 importlist_t *ie; | |
| 331 ie = lw_expr_specptr(e); | |
| 332 buf[0] = 0x02; | |
| 333 writebytes(buf, 1, 1, of); | |
| 334 writebytes(ie -> symbol, strlen(ie -> symbol) + 1, 1, of); | |
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335 return 0; |
| 376 | 336 } |
| 337 case lwasm_expr_syment: | |
| 338 { | |
| 339 struct symtabe *se; | |
| 340 se = lw_expr_specptr(e); | |
| 341 buf[0] = 0x03; | |
| 342 writebytes(buf, 1, 1, of); | |
| 343 writebytes(se -> symbol, strlen(se -> symbol), 1, of); | |
| 344 if (se -> context != -1) | |
| 345 { | |
| 346 sprintf(buf, "\x01%d", se -> context); | |
| 347 writebytes(buf, strlen(buf), 1, of); | |
| 348 } | |
| 349 writebytes("", 1, 1, of); | |
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350 return 0; |
| 376 | 351 } |
| 352 } | |
| 353 | |
| 354 default: | |
| 355 // unrecognized term type - replace with integer 0 | |
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356 // fprintf(stderr, "Unrecognized term type: %s\n", lw_expr_print(e)); |
| 376 | 357 buf[0] = 0x01; |
| 358 buf[1] = 0x00; | |
| 359 buf[2] = 0x00; | |
| 360 writebytes(buf, 3, 1, of); | |
| 361 break; | |
| 362 } | |
| 363 return 0; | |
| 364 } | |
| 365 | |
| 366 | |
| 339 | 367 void write_code_obj(asmstate_t *as, FILE *of) |
| 368 { | |
| 374 | 369 line_t *l; |
| 339 | 370 sectiontab_t *s; |
| 374 | 371 reloctab_t *re; |
| 375 | 372 exportlist_t *ex; |
| 374 | 373 struct symtabe *se; |
| 374 | |
| 339 | 375 int i; |
| 376 unsigned char buf[16]; | |
| 377 | |
| 378 // output the magic number and file header | |
| 379 // the 8 is NOT an error | |
| 380 writebytes("LWOBJ16", 8, 1, of); | |
| 381 | |
| 382 // run through the entire system and build the byte streams for each | |
| 383 // section; at the same time, generate a list of "local" symbols to | |
| 384 // output for each section | |
| 385 // NOTE: for "local" symbols, we will append \x01 and the ascii string | |
| 386 // of the context identifier (so sym in context 1 would be "sym\x011" | |
| 387 // we can do this because the linker can handle symbols with any | |
| 388 // character other than NUL. | |
| 389 // also we will generate a list of incomplete references for each | |
| 390 // section along with the actual definition that will be output | |
| 391 | |
| 392 // once all this information is generated, we will output each section | |
| 393 // to the file | |
| 394 | |
| 395 // NOTE: we build everything in memory then output it because the | |
| 396 // assembler accepts multiple instances of the same section but the | |
| 397 // linker expects only one instance of each section in the object file | |
| 398 // so we need to collect all the various pieces of a section together | |
| 399 // (also, the assembler treated multiple instances of the same section | |
| 400 // as continuations of previous sections so we would need to collect | |
| 401 // them together anyway. | |
| 402 | |
| 374 | 403 for (l = as -> line_head; l; l = l -> next) |
| 339 | 404 { |
| 374 | 405 if (l -> csect) |
| 339 | 406 { |
| 407 // we're in a section - need to output some bytes | |
| 374 | 408 if (l -> outputl > 0) |
| 409 for (i = 0; i < l -> outputl; i++) | |
| 410 write_code_obj_sbadd(l -> csect, l -> output[i]); | |
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411 else if (l -> outputl == 0 || l -> outputl == -1) |
| 374 | 412 for (i = 0; i < l -> len; i++) |
| 413 write_code_obj_sbadd(l -> csect, 0); | |
| 339 | 414 } |
| 415 } | |
| 416 | |
| 417 // run through the sections | |
| 418 for (s = as -> sections; s; s = s -> next) | |
| 419 { | |
| 420 // write the name | |
| 421 writebytes(s -> name, strlen(s -> name) + 1, 1, of); | |
| 422 | |
| 423 // write the flags | |
| 374 | 424 if (s -> flags & section_flag_bss) |
| 339 | 425 writebytes("\x01", 1, 1, of); |
| 426 | |
| 427 // indicate end of flags - the "" is NOT an error | |
| 428 writebytes("", 1, 1, of); | |
| 429 | |
| 430 // now the local symbols | |
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431 |
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432 // a symbol for section base address |
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433 writebytes("\x02", 1, 1, of); |
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434 writebytes(s -> name, strlen(s -> name) + 1, 1, of); |
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parents:
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435 // address 0; "\0" is not an error |
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parents:
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436 writebytes("\0", 2, 1, of); |
| 374 | 437 for (se = as -> symtab.head; se; se = se -> next) |
| 339 | 438 { |
| 439 // ignore symbols not in this section | |
| 374 | 440 if (se -> section != s) |
| 339 | 441 continue; |
| 442 | |
| 374 | 443 if (se -> flags & symbol_flag_set) |
| 339 | 444 continue; |
| 445 | |
| 374 | 446 // don't output non-constant symbols |
| 447 if (!lw_expr_istype(se -> value, lw_expr_type_int)) | |
| 339 | 448 continue; |
| 374 | 449 |
| 450 writebytes(se -> symbol, strlen(se -> symbol), 1, of); | |
| 339 | 451 if (se -> context >= 0) |
| 452 { | |
| 453 writebytes("\x01", 1, 1, of); | |
| 454 sprintf(buf, "%d", se -> context); | |
| 455 writebytes(buf, strlen(buf), 1, of); | |
| 456 } | |
| 457 // the "" is NOT an error | |
| 458 writebytes("", 1, 1, of); | |
| 459 | |
| 460 // write the address | |
| 374 | 461 buf[0] = (lw_expr_intval(se -> value) >> 8) & 0xff; |
| 462 buf[1] = lw_expr_intval(se -> value) & 0xff; | |
| 339 | 463 writebytes(buf, 2, 1, of); |
| 464 } | |
| 465 // flag end of local symbol table - "" is NOT an error | |
| 466 writebytes("", 1, 1, of); | |
| 467 | |
| 374 | 468 // now the exports -- FIXME |
| 375 | 469 for (ex = as -> exportlist; ex; ex = ex -> next) |
| 339 | 470 { |
| 374 | 471 int eval; |
| 375 | 472 lw_expr_t te; |
| 473 line_t tl; | |
| 474 | |
| 475 if (ex -> se -> section != s) | |
| 374 | 476 continue; |
| 375 | 477 te = lw_expr_copy(ex -> se -> value); |
| 478 as -> csect = ex -> se -> section; | |
| 479 as -> exportcheck = 1; | |
| 480 tl.as = as; | |
| 481 as -> cl = &tl; | |
| 482 lwasm_reduce_expr(as, te); | |
| 483 as -> exportcheck = 0; | |
| 484 as -> cl = NULL; | |
| 485 if (!lw_expr_istype(te, lw_expr_type_int)) | |
| 486 { | |
| 487 lw_expr_destroy(te); | |
| 374 | 488 continue; |
| 375 | 489 } |
| 490 eval = lw_expr_intval(te); | |
| 491 lw_expr_destroy(te); | |
| 374 | 492 writebytes(ex -> symbol, strlen(ex -> symbol) + 1, 1, of); |
| 493 buf[0] = (eval >> 8) & 0xff; | |
| 494 buf[1] = eval & 0xff; | |
| 339 | 495 writebytes(buf, 2, 1, of); |
| 496 } | |
| 375 | 497 |
| 339 | 498 // flag end of exported symbols - "" is NOT an error |
| 499 writebytes("", 1, 1, of); | |
| 500 | |
| 374 | 501 // FIXME - relocation table |
| 376 | 502 for (re = s -> reloctab; re; re = re -> next) |
| 339 | 503 { |
| 376 | 504 int offset; |
| 505 lw_expr_t te; | |
| 506 line_t tl; | |
| 507 | |
| 508 tl.as = as; | |
| 509 as -> cl = &tl; | |
| 510 as -> csect = s; | |
| 511 as -> exportcheck = 1; | |
| 512 | |
| 339 | 513 if (re -> expr == NULL) |
| 514 { | |
| 515 // this is an error but we'll simply ignore it | |
| 516 // and not output this expression | |
| 517 continue; | |
| 518 } | |
| 519 | |
| 520 // work through each term in the expression and output | |
| 521 // the proper equivalent to the object file | |
| 376 | 522 if (re -> size == 1) |
| 339 | 523 { |
| 524 // flag an 8 bit relocation (low 8 bits will be used) | |
| 525 buf[0] = 0xFF; | |
| 526 buf[1] = 0x01; | |
| 527 writebytes(buf, 2, 1, of); | |
| 528 } | |
| 376 | 529 |
|
387
a741d2e4869f
Various bugfixes; fixed lwobjdump to display symbols with unprintable characters more sensibly; start of a (nonfunctional for now) testing framework
lost@l-w.ca
parents:
377
diff
changeset
|
530 te = lw_expr_copy(re -> offset); |
| 376 | 531 lwasm_reduce_expr(as, te); |
| 532 if (!lw_expr_istype(te, lw_expr_type_int)) | |
| 339 | 533 { |
| 376 | 534 lw_expr_destroy(te); |
| 535 continue; | |
| 339 | 536 } |
| 376 | 537 offset = lw_expr_intval(te); |
| 538 lw_expr_destroy(te); | |
| 539 | |
| 540 // output expression | |
| 541 lw_expr_testterms(re -> expr, write_code_obj_expraux, of); | |
| 339 | 542 |
| 543 // flag end of expressions | |
| 544 writebytes("", 1, 1, of); | |
| 545 | |
| 546 // write the offset | |
| 376 | 547 buf[0] = (offset >> 8) & 0xff; |
| 548 buf[1] = offset & 0xff; | |
| 339 | 549 writebytes(buf, 2, 1, of); |
| 550 } | |
| 376 | 551 |
| 339 | 552 // flag end of incomplete references list |
| 553 writebytes("", 1, 1, of); | |
| 554 | |
| 555 // now blast out the code | |
| 556 | |
| 557 // length | |
| 558 buf[0] = s -> oblen >> 8 & 0xff; | |
| 559 buf[1] = s -> oblen & 0xff; | |
| 560 writebytes(buf, 2, 1, of); | |
| 561 | |
| 374 | 562 if (!(s -> flags & section_flag_bss)) |
| 339 | 563 { |
| 564 writebytes(s -> obytes, s -> oblen, 1, of); | |
| 565 } | |
| 566 } | |
| 567 | |
| 568 // flag no more sections | |
| 569 // the "" is NOT an error | |
| 570 writebytes("", 1, 1, of); | |
| 571 } |