| 1 | /* tc-wasm32.c -- Assembler code for the wasm32 target. |
| 2 | |
| 3 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify it |
| 8 | under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, but WITHOUT |
| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 15 | License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 20 | 02110-1301, USA. */ |
| 21 | |
| 22 | #include "as.h" |
| 23 | #include "safe-ctype.h" |
| 24 | #include "subsegs.h" |
| 25 | #include "dwarf2dbg.h" |
| 26 | #include "dw2gencfi.h" |
| 27 | #include "elf/wasm32.h" |
| 28 | #include <float.h> |
| 29 | |
| 30 | enum wasm_class |
| 31 | { |
| 32 | wasm_typed, /* a typed opcode: block, loop, or if */ |
| 33 | wasm_special, /* a special opcode: unreachable, nop, else, |
| 34 | or end */ |
| 35 | wasm_break, /* "br" */ |
| 36 | wasm_break_if, /* "br_if" opcode */ |
| 37 | wasm_break_table, /* "br_table" opcode */ |
| 38 | wasm_return, /* "return" opcode */ |
| 39 | wasm_call, /* "call" opcode */ |
| 40 | wasm_call_indirect, /* "call_indirect" opcode */ |
| 41 | wasm_get_local, /* "get_local" and "get_global" */ |
| 42 | wasm_set_local, /* "set_local" and "set_global" */ |
| 43 | wasm_tee_local, /* "tee_local" */ |
| 44 | wasm_drop, /* "drop" */ |
| 45 | wasm_constant_i32, /* "i32.const" */ |
| 46 | wasm_constant_i64, /* "i64.const" */ |
| 47 | wasm_constant_f32, /* "f32.const" */ |
| 48 | wasm_constant_f64, /* "f64.const" */ |
| 49 | wasm_unary, /* unary operators */ |
| 50 | wasm_binary, /* binary operators */ |
| 51 | wasm_conv, /* conversion operators */ |
| 52 | wasm_load, /* load operators */ |
| 53 | wasm_store, /* store operators */ |
| 54 | wasm_select, /* "select" */ |
| 55 | wasm_relational, /* comparison operators, except for "eqz" */ |
| 56 | wasm_eqz, /* "eqz" */ |
| 57 | wasm_current_memory, /* "current_memory" */ |
| 58 | wasm_grow_memory, /* "grow_memory" */ |
| 59 | wasm_signature /* "signature", which isn't an opcode */ |
| 60 | }; |
| 61 | |
| 62 | #define WASM_OPCODE(opcode, name, intype, outtype, class, signedness) \ |
| 63 | { name, wasm_ ## class, opcode }, |
| 64 | |
| 65 | struct wasm32_opcode_s |
| 66 | { |
| 67 | const char *name; |
| 68 | enum wasm_class clas; |
| 69 | unsigned char opcode; |
| 70 | } wasm32_opcodes[] = |
| 71 | { |
| 72 | #include "opcode/wasm.h" |
| 73 | { |
| 74 | NULL, 0, 0} |
| 75 | }; |
| 76 | |
| 77 | const char comment_chars[] = ";#"; |
| 78 | const char line_comment_chars[] = ";#"; |
| 79 | const char line_separator_chars[] = ""; |
| 80 | |
| 81 | const char *md_shortopts = "m:"; |
| 82 | |
| 83 | const char EXP_CHARS[] = "eE"; |
| 84 | const char FLT_CHARS[] = "dD"; |
| 85 | |
| 86 | /* The target specific pseudo-ops which we support. */ |
| 87 | |
| 88 | const pseudo_typeS md_pseudo_table[] = |
| 89 | { |
| 90 | {NULL, NULL, 0} |
| 91 | }; |
| 92 | |
| 93 | /* Opcode hash table. */ |
| 94 | |
| 95 | static struct hash_control *wasm32_hash; |
| 96 | |
| 97 | struct option md_longopts[] = |
| 98 | { |
| 99 | {NULL, no_argument, NULL, 0} |
| 100 | }; |
| 101 | |
| 102 | size_t md_longopts_size = sizeof (md_longopts); |
| 103 | |
| 104 | /* No relaxation/no machine-dependent frags. */ |
| 105 | |
| 106 | int |
| 107 | md_estimate_size_before_relax (fragS * fragp ATTRIBUTE_UNUSED, |
| 108 | asection * seg ATTRIBUTE_UNUSED) |
| 109 | { |
| 110 | abort (); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | void |
| 115 | md_show_usage (FILE * stream) |
| 116 | { |
| 117 | fprintf (stream, _("wasm32 assembler options:\n")); |
| 118 | } |
| 119 | |
| 120 | /* No machine-dependent options. */ |
| 121 | |
| 122 | int |
| 123 | md_parse_option (int c ATTRIBUTE_UNUSED, const char *arg ATTRIBUTE_UNUSED) |
| 124 | { |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | /* No machine-dependent symbols. */ |
| 129 | |
| 130 | symbolS * |
| 131 | md_undefined_symbol (char *name ATTRIBUTE_UNUSED) |
| 132 | { |
| 133 | return NULL; |
| 134 | } |
| 135 | |
| 136 | /* IEEE little-endian floats. */ |
| 137 | |
| 138 | const char * |
| 139 | md_atof (int type, char *litP, int *sizeP) |
| 140 | { |
| 141 | return ieee_md_atof (type, litP, sizeP, FALSE); |
| 142 | } |
| 143 | |
| 144 | /* No machine-dependent frags. */ |
| 145 | |
| 146 | void |
| 147 | md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, |
| 148 | asection * sec ATTRIBUTE_UNUSED, |
| 149 | fragS * fragP ATTRIBUTE_UNUSED) |
| 150 | { |
| 151 | abort (); |
| 152 | } |
| 153 | |
| 154 | /* Build opcode hash table, set some flags. */ |
| 155 | |
| 156 | void |
| 157 | md_begin (void) |
| 158 | { |
| 159 | struct wasm32_opcode_s *opcode; |
| 160 | |
| 161 | wasm32_hash = hash_new (); |
| 162 | |
| 163 | /* Insert unique names into hash table. This hash table then |
| 164 | provides a quick index to the first opcode with a particular name |
| 165 | in the opcode table. */ |
| 166 | for (opcode = wasm32_opcodes; opcode->name; opcode++) |
| 167 | hash_insert (wasm32_hash, opcode->name, (char *) opcode); |
| 168 | |
| 169 | linkrelax = 0; |
| 170 | flag_sectname_subst = 1; |
| 171 | flag_no_comments = 0; |
| 172 | flag_keep_locals = 1; |
| 173 | } |
| 174 | |
| 175 | /* Do the normal thing for md_section_align. */ |
| 176 | |
| 177 | valueT |
| 178 | md_section_align (asection * seg, valueT addr) |
| 179 | { |
| 180 | int align = bfd_section_alignment (seg); |
| 181 | return ((addr + (1 << align) - 1) & -(1 << align)); |
| 182 | } |
| 183 | |
| 184 | /* Apply a fixup, return TRUE if done (and no relocation is |
| 185 | needed). */ |
| 186 | |
| 187 | static bfd_boolean |
| 188 | apply_full_field_fix (fixS * fixP, char *buf, bfd_vma val, int size) |
| 189 | { |
| 190 | if (fixP->fx_addsy != NULL || fixP->fx_pcrel) |
| 191 | { |
| 192 | fixP->fx_addnumber = val; |
| 193 | return FALSE; |
| 194 | } |
| 195 | |
| 196 | number_to_chars_littleendian (buf, val, size); |
| 197 | return TRUE; |
| 198 | } |
| 199 | |
| 200 | /* Apply a fixup (potentially PC-relative), set the fx_done flag if |
| 201 | done. */ |
| 202 | |
| 203 | void |
| 204 | md_apply_fix (fixS * fixP, valueT * valP, segT seg ATTRIBUTE_UNUSED) |
| 205 | { |
| 206 | char *buf = fixP->fx_where + fixP->fx_frag->fr_literal; |
| 207 | long val = (long) *valP; |
| 208 | |
| 209 | if (fixP->fx_pcrel) |
| 210 | { |
| 211 | switch (fixP->fx_r_type) |
| 212 | { |
| 213 | default: |
| 214 | bfd_set_error (bfd_error_bad_value); |
| 215 | return; |
| 216 | |
| 217 | case BFD_RELOC_32: |
| 218 | fixP->fx_r_type = BFD_RELOC_32_PCREL; |
| 219 | return; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | if (apply_full_field_fix (fixP, buf, val, fixP->fx_size)) |
| 224 | fixP->fx_done = 1; |
| 225 | } |
| 226 | |
| 227 | /* Skip whitespace. */ |
| 228 | |
| 229 | static inline char * |
| 230 | skip_space (char *s) |
| 231 | { |
| 232 | while (*s == ' ' || *s == '\t') |
| 233 | ++s; |
| 234 | return s; |
| 235 | } |
| 236 | |
| 237 | /* Allow '/' in opcodes. */ |
| 238 | |
| 239 | static inline bfd_boolean |
| 240 | is_part_of_opcode (char c) |
| 241 | { |
| 242 | return is_part_of_name (c) || (c == '/'); |
| 243 | } |
| 244 | |
| 245 | /* Extract an opcode. */ |
| 246 | |
| 247 | static char * |
| 248 | extract_opcode (char *from, char *to, int limit) |
| 249 | { |
| 250 | char *op_end; |
| 251 | int size = 0; |
| 252 | |
| 253 | /* Drop leading whitespace. */ |
| 254 | from = skip_space (from); |
| 255 | *to = 0; |
| 256 | |
| 257 | /* Find the op code end. */ |
| 258 | for (op_end = from; *op_end != 0 && is_part_of_opcode (*op_end);) |
| 259 | { |
| 260 | to[size++] = *op_end++; |
| 261 | if (size + 1 >= limit) |
| 262 | break; |
| 263 | } |
| 264 | |
| 265 | to[size] = 0; |
| 266 | return op_end; |
| 267 | } |
| 268 | |
| 269 | /* Produce an unsigned LEB128 integer padded to the right number of |
| 270 | bytes to store BITS bits, of value VALUE. Uses FRAG_APPEND_1_CHAR |
| 271 | to write. */ |
| 272 | |
| 273 | static void |
| 274 | wasm32_put_long_uleb128 (int bits, unsigned long value) |
| 275 | { |
| 276 | unsigned char c; |
| 277 | int i = 0; |
| 278 | |
| 279 | do |
| 280 | { |
| 281 | c = value & 0x7f; |
| 282 | value >>= 7; |
| 283 | if (i < (bits - 1) / 7) |
| 284 | c |= 0x80; |
| 285 | FRAG_APPEND_1_CHAR (c); |
| 286 | } |
| 287 | while (++i < (bits + 6) / 7); |
| 288 | } |
| 289 | |
| 290 | /* Produce a signed LEB128 integer, using FRAG_APPEND_1_CHAR to |
| 291 | write. */ |
| 292 | |
| 293 | static void |
| 294 | wasm32_put_sleb128 (long value) |
| 295 | { |
| 296 | unsigned char c; |
| 297 | int more; |
| 298 | |
| 299 | do |
| 300 | { |
| 301 | c = (value & 0x7f); |
| 302 | value >>= 7; |
| 303 | more = !((((value == 0) && ((c & 0x40) == 0)) |
| 304 | || ((value == -1) && ((c & 0x40) != 0)))); |
| 305 | if (more) |
| 306 | c |= 0x80; |
| 307 | FRAG_APPEND_1_CHAR (c); |
| 308 | } |
| 309 | while (more); |
| 310 | } |
| 311 | |
| 312 | /* Produce an unsigned LEB128 integer, using FRAG_APPEND_1_CHAR to |
| 313 | write. */ |
| 314 | |
| 315 | static void |
| 316 | wasm32_put_uleb128 (unsigned long value) |
| 317 | { |
| 318 | unsigned char c; |
| 319 | |
| 320 | do |
| 321 | { |
| 322 | c = value & 0x7f; |
| 323 | value >>= 7; |
| 324 | if (value) |
| 325 | c |= 0x80; |
| 326 | FRAG_APPEND_1_CHAR (c); |
| 327 | } |
| 328 | while (value); |
| 329 | } |
| 330 | |
| 331 | /* Read an integer expression. Produce an LEB128-encoded integer if |
| 332 | it's a constant, a padded LEB128 plus a relocation if it's a |
| 333 | symbol, or a special relocation for <expr>@got, <expr>@gotcode, and |
| 334 | <expr>@plt{__sigchar_<signature>}. */ |
| 335 | |
| 336 | static bfd_boolean |
| 337 | wasm32_leb128 (char **line, int bits, int sign) |
| 338 | { |
| 339 | char *t = input_line_pointer; |
| 340 | char *str = *line; |
| 341 | char *str0 = str; |
| 342 | struct reloc_list *reloc; |
| 343 | expressionS ex; |
| 344 | int gotrel = 0; |
| 345 | int pltrel = 0; |
| 346 | int code = 0; |
| 347 | const char *relname; |
| 348 | |
| 349 | input_line_pointer = str; |
| 350 | expression (&ex); |
| 351 | |
| 352 | if (ex.X_op == O_constant && *input_line_pointer != '@') |
| 353 | { |
| 354 | long value = ex.X_add_number; |
| 355 | |
| 356 | str = input_line_pointer; |
| 357 | str = skip_space (str); |
| 358 | *line = str; |
| 359 | if (sign) |
| 360 | wasm32_put_sleb128 (value); |
| 361 | else |
| 362 | { |
| 363 | if (value < 0) |
| 364 | as_bad (_("unexpected negative constant")); |
| 365 | wasm32_put_uleb128 (value); |
| 366 | } |
| 367 | input_line_pointer = t; |
| 368 | return str != str0; |
| 369 | } |
| 370 | |
| 371 | reloc = XNEW (struct reloc_list); |
| 372 | reloc->u.a.offset_sym = expr_build_dot (); |
| 373 | if (ex.X_op == O_symbol) |
| 374 | { |
| 375 | reloc->u.a.sym = ex.X_add_symbol; |
| 376 | reloc->u.a.addend = ex.X_add_number; |
| 377 | } |
| 378 | else |
| 379 | { |
| 380 | reloc->u.a.sym = make_expr_symbol (&ex); |
| 381 | reloc->u.a.addend = 0; |
| 382 | } |
| 383 | /* i32.const fpointer@gotcode */ |
| 384 | if (strncmp (input_line_pointer, "@gotcode", 8) == 0) |
| 385 | { |
| 386 | gotrel = 1; |
| 387 | code = 1; |
| 388 | input_line_pointer += 8; |
| 389 | } |
| 390 | /* i32.const data@got */ |
| 391 | else if (strncmp (input_line_pointer, "@got", 4) == 0) |
| 392 | { |
| 393 | gotrel = 1; |
| 394 | input_line_pointer += 4; |
| 395 | } |
| 396 | /* call f@plt{__sigchar_FiiiiE} */ |
| 397 | else if (strncmp (input_line_pointer, "@plt", 4) == 0) |
| 398 | { |
| 399 | char *end_of_sig; |
| 400 | |
| 401 | pltrel = 1; |
| 402 | code = 1; |
| 403 | input_line_pointer += 4; |
| 404 | |
| 405 | if (strncmp (input_line_pointer, "{", 1) == 0 |
| 406 | && (end_of_sig = strchr (input_line_pointer, '}'))) |
| 407 | { |
| 408 | char *signature; |
| 409 | struct reloc_list *reloc2; |
| 410 | size_t siglength = end_of_sig - (input_line_pointer + 1); |
| 411 | |
| 412 | signature = strndup (input_line_pointer + 1, siglength); |
| 413 | |
| 414 | reloc2 = XNEW (struct reloc_list); |
| 415 | reloc2->u.a.offset_sym = expr_build_dot (); |
| 416 | reloc2->u.a.sym = symbol_find_or_make (signature); |
| 417 | reloc2->u.a.addend = 0; |
| 418 | reloc2->u.a.howto = bfd_reloc_name_lookup |
| 419 | (stdoutput, "R_WASM32_PLT_SIG"); |
| 420 | reloc2->next = reloc_list; |
| 421 | reloc_list = reloc2; |
| 422 | input_line_pointer = end_of_sig + 1; |
| 423 | } |
| 424 | else |
| 425 | { |
| 426 | as_bad (_("no function type on PLT reloc")); |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | if (gotrel && code) |
| 431 | relname = "R_WASM32_LEB128_GOT_CODE"; |
| 432 | else if (gotrel) |
| 433 | relname = "R_WASM32_LEB128_GOT"; |
| 434 | else if (pltrel) |
| 435 | relname = "R_WASM32_LEB128_PLT"; |
| 436 | else |
| 437 | relname = "R_WASM32_LEB128"; |
| 438 | |
| 439 | reloc->u.a.howto = bfd_reloc_name_lookup (stdoutput, relname); |
| 440 | if (!reloc->u.a.howto) |
| 441 | as_bad (_("couldn't find relocation to use")); |
| 442 | reloc->file = as_where (&reloc->line); |
| 443 | reloc->next = reloc_list; |
| 444 | reloc_list = reloc; |
| 445 | |
| 446 | str = input_line_pointer; |
| 447 | str = skip_space (str); |
| 448 | *line = str; |
| 449 | wasm32_put_long_uleb128 (bits, 0); |
| 450 | input_line_pointer = t; |
| 451 | |
| 452 | return str != str0; |
| 453 | } |
| 454 | |
| 455 | /* Read an integer expression and produce an unsigned LEB128 integer, |
| 456 | or a relocation for it. */ |
| 457 | |
| 458 | static bfd_boolean |
| 459 | wasm32_uleb128 (char **line, int bits) |
| 460 | { |
| 461 | return wasm32_leb128 (line, bits, 0); |
| 462 | } |
| 463 | |
| 464 | /* Read an integer expression and produce a signed LEB128 integer, or |
| 465 | a relocation for it. */ |
| 466 | |
| 467 | static bfd_boolean |
| 468 | wasm32_sleb128 (char **line, int bits) |
| 469 | { |
| 470 | return wasm32_leb128 (line, bits, 1); |
| 471 | } |
| 472 | |
| 473 | /* Read an f32. (Like float_cons ('f')). */ |
| 474 | |
| 475 | static void |
| 476 | wasm32_f32 (char **line) |
| 477 | { |
| 478 | char *t = input_line_pointer; |
| 479 | |
| 480 | input_line_pointer = *line; |
| 481 | float_cons ('f'); |
| 482 | *line = input_line_pointer; |
| 483 | input_line_pointer = t; |
| 484 | } |
| 485 | |
| 486 | /* Read an f64. (Like float_cons ('d')). */ |
| 487 | |
| 488 | static void |
| 489 | wasm32_f64 (char **line) |
| 490 | { |
| 491 | char *t = input_line_pointer; |
| 492 | |
| 493 | input_line_pointer = *line; |
| 494 | float_cons ('d'); |
| 495 | *line = input_line_pointer; |
| 496 | input_line_pointer = t; |
| 497 | } |
| 498 | |
| 499 | /* Assemble a signature from LINE, replacing it with the new input |
| 500 | pointer. Signatures are simple expressions matching the regexp |
| 501 | F[ilfd]*v?E, and interpreted as though they were C++-mangled |
| 502 | function types on a 64-bit machine. */ |
| 503 | |
| 504 | static void |
| 505 | wasm32_signature (char **line) |
| 506 | { |
| 507 | unsigned long count = 0; |
| 508 | char *str = *line; |
| 509 | char *ostr; |
| 510 | char *result; |
| 511 | |
| 512 | if (*str++ != 'F') |
| 513 | as_bad (_("Not a function type")); |
| 514 | result = str; |
| 515 | ostr = str + 1; |
| 516 | str++; |
| 517 | |
| 518 | while (*str != 'E') |
| 519 | { |
| 520 | switch (*str++) |
| 521 | { |
| 522 | case 'i': |
| 523 | case 'l': |
| 524 | case 'f': |
| 525 | case 'd': |
| 526 | count++; |
| 527 | break; |
| 528 | default: |
| 529 | as_bad (_("Unknown type %c\n"), str[-1]); |
| 530 | } |
| 531 | } |
| 532 | wasm32_put_uleb128 (count); |
| 533 | str = ostr; |
| 534 | while (*str != 'E') |
| 535 | { |
| 536 | switch (*str++) |
| 537 | { |
| 538 | case 'i': |
| 539 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_I32); |
| 540 | break; |
| 541 | case 'l': |
| 542 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_I64); |
| 543 | break; |
| 544 | case 'f': |
| 545 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_F32); |
| 546 | break; |
| 547 | case 'd': |
| 548 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_F64); |
| 549 | break; |
| 550 | default: |
| 551 | as_bad (_("Unknown type")); |
| 552 | } |
| 553 | } |
| 554 | str++; |
| 555 | switch (*result) |
| 556 | { |
| 557 | case 'v': |
| 558 | FRAG_APPEND_1_CHAR (0x00); /* no return value */ |
| 559 | break; |
| 560 | case 'i': |
| 561 | FRAG_APPEND_1_CHAR (0x01); /* one return value */ |
| 562 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_I32); |
| 563 | break; |
| 564 | case 'l': |
| 565 | FRAG_APPEND_1_CHAR (0x01); /* one return value */ |
| 566 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_I64); |
| 567 | break; |
| 568 | case 'f': |
| 569 | FRAG_APPEND_1_CHAR (0x01); /* one return value */ |
| 570 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_F32); |
| 571 | break; |
| 572 | case 'd': |
| 573 | FRAG_APPEND_1_CHAR (0x01); /* one return value */ |
| 574 | FRAG_APPEND_1_CHAR (BLOCK_TYPE_F64); |
| 575 | break; |
| 576 | default: |
| 577 | as_bad (_("Unknown type")); |
| 578 | } |
| 579 | *line = str; |
| 580 | } |
| 581 | |
| 582 | /* Main operands function. Read the operands for OPCODE from LINE, |
| 583 | replacing it with the new input pointer. */ |
| 584 | |
| 585 | static void |
| 586 | wasm32_operands (struct wasm32_opcode_s *opcode, char **line) |
| 587 | { |
| 588 | char *str = *line; |
| 589 | unsigned long block_type = 0; |
| 590 | |
| 591 | FRAG_APPEND_1_CHAR (opcode->opcode); |
| 592 | str = skip_space (str); |
| 593 | if (str[0] == '[') |
| 594 | { |
| 595 | if (opcode->clas == wasm_typed) |
| 596 | { |
| 597 | str++; |
| 598 | block_type = BLOCK_TYPE_NONE; |
| 599 | if (str[0] != ']') |
| 600 | { |
| 601 | str = skip_space (str); |
| 602 | switch (str[0]) |
| 603 | { |
| 604 | case 'i': |
| 605 | block_type = BLOCK_TYPE_I32; |
| 606 | str++; |
| 607 | break; |
| 608 | case 'l': |
| 609 | block_type = BLOCK_TYPE_I64; |
| 610 | str++; |
| 611 | break; |
| 612 | case 'f': |
| 613 | block_type = BLOCK_TYPE_F32; |
| 614 | str++; |
| 615 | break; |
| 616 | case 'd': |
| 617 | block_type = BLOCK_TYPE_F64; |
| 618 | str++; |
| 619 | break; |
| 620 | } |
| 621 | str = skip_space (str); |
| 622 | if (str[0] == ']') |
| 623 | str++; |
| 624 | else |
| 625 | as_bad (_("only single block types allowed")); |
| 626 | str = skip_space (str); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | str++; |
| 631 | str = skip_space (str); |
| 632 | } |
| 633 | } |
| 634 | else |
| 635 | as_bad (_("instruction does not take a block type")); |
| 636 | } |
| 637 | |
| 638 | switch (opcode->clas) |
| 639 | { |
| 640 | case wasm_drop: |
| 641 | case wasm_special: |
| 642 | case wasm_binary: |
| 643 | case wasm_unary: |
| 644 | case wasm_relational: |
| 645 | case wasm_select: |
| 646 | case wasm_eqz: |
| 647 | case wasm_conv: |
| 648 | case wasm_return: |
| 649 | break; |
| 650 | case wasm_typed: |
| 651 | if (block_type == 0) |
| 652 | as_bad (_("missing block type")); |
| 653 | FRAG_APPEND_1_CHAR (block_type); |
| 654 | break; |
| 655 | case wasm_store: |
| 656 | case wasm_load: |
| 657 | if (str[0] == 'a' && str[1] == '=') |
| 658 | { |
| 659 | str += 2; |
| 660 | if (!wasm32_uleb128 (&str, 32)) |
| 661 | as_bad (_("missing alignment hint")); |
| 662 | } |
| 663 | else |
| 664 | { |
| 665 | as_bad (_("missing alignment hint")); |
| 666 | } |
| 667 | str = skip_space (str); |
| 668 | if (!wasm32_uleb128 (&str, 32)) |
| 669 | as_bad (_("missing offset")); |
| 670 | break; |
| 671 | case wasm_set_local: |
| 672 | case wasm_get_local: |
| 673 | case wasm_tee_local: |
| 674 | if (!wasm32_uleb128 (&str, 32)) |
| 675 | as_bad (_("missing local index")); |
| 676 | break; |
| 677 | case wasm_break: |
| 678 | case wasm_break_if: |
| 679 | if (!wasm32_uleb128 (&str, 32)) |
| 680 | as_bad (_("missing break count")); |
| 681 | break; |
| 682 | case wasm_current_memory: |
| 683 | case wasm_grow_memory: |
| 684 | if (!wasm32_uleb128 (&str, 32)) |
| 685 | as_bad (_("missing reserved current_memory/grow_memory argument")); |
| 686 | break; |
| 687 | case wasm_call: |
| 688 | if (!wasm32_uleb128 (&str, 32)) |
| 689 | as_bad (_("missing call argument")); |
| 690 | break; |
| 691 | case wasm_call_indirect: |
| 692 | if (!wasm32_uleb128 (&str, 32)) |
| 693 | as_bad (_("missing call signature")); |
| 694 | if (!wasm32_uleb128 (&str, 32)) |
| 695 | as_bad (_("missing table index")); |
| 696 | break; |
| 697 | case wasm_constant_i32: |
| 698 | wasm32_sleb128 (&str, 32); |
| 699 | break; |
| 700 | case wasm_constant_i64: |
| 701 | wasm32_sleb128 (&str, 64); |
| 702 | break; |
| 703 | case wasm_constant_f32: |
| 704 | wasm32_f32 (&str); |
| 705 | return; |
| 706 | case wasm_constant_f64: |
| 707 | wasm32_f64 (&str); |
| 708 | return; |
| 709 | case wasm_break_table: |
| 710 | { |
| 711 | do |
| 712 | { |
| 713 | wasm32_uleb128 (&str, 32); |
| 714 | str = skip_space (str); |
| 715 | } |
| 716 | while (str[0]); |
| 717 | |
| 718 | break; |
| 719 | } |
| 720 | case wasm_signature: |
| 721 | wasm32_signature (&str); |
| 722 | } |
| 723 | str = skip_space (str); |
| 724 | |
| 725 | if (*str) |
| 726 | as_bad (_("junk at end of line, first unrecognized character is `%c'"), |
| 727 | *str); |
| 728 | |
| 729 | *line = str; |
| 730 | |
| 731 | return; |
| 732 | } |
| 733 | |
| 734 | /* Main assembly function. Find the opcode and call |
| 735 | wasm32_operands(). */ |
| 736 | |
| 737 | void |
| 738 | md_assemble (char *str) |
| 739 | { |
| 740 | char op[32]; |
| 741 | char *t; |
| 742 | struct wasm32_opcode_s *opcode; |
| 743 | |
| 744 | str = skip_space (extract_opcode (str, op, sizeof (op))); |
| 745 | |
| 746 | if (!op[0]) |
| 747 | as_bad (_("can't find opcode ")); |
| 748 | |
| 749 | opcode = (struct wasm32_opcode_s *) hash_find (wasm32_hash, op); |
| 750 | |
| 751 | if (opcode == NULL) |
| 752 | { |
| 753 | as_bad (_("unknown opcode `%s'"), op); |
| 754 | return; |
| 755 | } |
| 756 | |
| 757 | dwarf2_emit_insn (0); |
| 758 | |
| 759 | t = input_line_pointer; |
| 760 | wasm32_operands (opcode, &str); |
| 761 | input_line_pointer = t; |
| 762 | } |
| 763 | |
| 764 | /* Don't replace PLT/GOT relocations with section symbols, so they |
| 765 | don't get an addend. */ |
| 766 | |
| 767 | int |
| 768 | wasm32_force_relocation (fixS * f) |
| 769 | { |
| 770 | if (f->fx_r_type == BFD_RELOC_WASM32_LEB128_PLT |
| 771 | || f->fx_r_type == BFD_RELOC_WASM32_LEB128_GOT) |
| 772 | return 1; |
| 773 | |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | /* Don't replace PLT/GOT relocations with section symbols, so they |
| 778 | don't get an addend. */ |
| 779 | |
| 780 | bfd_boolean |
| 781 | wasm32_fix_adjustable (fixS * fixP) |
| 782 | { |
| 783 | if (fixP->fx_addsy == NULL) |
| 784 | return TRUE; |
| 785 | |
| 786 | if (fixP->fx_r_type == BFD_RELOC_WASM32_LEB128_PLT |
| 787 | || fixP->fx_r_type == BFD_RELOC_WASM32_LEB128_GOT) |
| 788 | return FALSE; |
| 789 | |
| 790 | return TRUE; |
| 791 | } |
| 792 | |
| 793 | /* Generate a reloc for FIXP. */ |
| 794 | |
| 795 | arelent * |
| 796 | tc_gen_reloc (asection * sec ATTRIBUTE_UNUSED, fixS * fixp) |
| 797 | { |
| 798 | arelent *reloc; |
| 799 | |
| 800 | reloc = (arelent *) xmalloc (sizeof (*reloc)); |
| 801 | reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); |
| 802 | *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy); |
| 803 | reloc->address = fixp->fx_frag->fr_address + fixp->fx_where; |
| 804 | |
| 805 | /* Make sure none of our internal relocations make it this far. |
| 806 | They'd better have been fully resolved by this point. */ |
| 807 | gas_assert ((int) fixp->fx_r_type > 0); |
| 808 | |
| 809 | reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type); |
| 810 | if (reloc->howto == NULL) |
| 811 | { |
| 812 | as_bad_where (fixp->fx_file, fixp->fx_line, |
| 813 | _("cannot represent `%s' relocation in object file"), |
| 814 | bfd_get_reloc_code_name (fixp->fx_r_type)); |
| 815 | return NULL; |
| 816 | } |
| 817 | |
| 818 | reloc->addend = fixp->fx_offset; |
| 819 | |
| 820 | return reloc; |
| 821 | } |