1 /* tc-xstormy16.c -- Assembler for the Sanyo XSTORMY16. 2 Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 3 Free Software Foundation. 4 5 This file is part of GAS, the GNU Assembler. 6 7 GAS is free software; you can redistribute it and/or modify 8 it 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, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public 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 19 the Free Software Foundation, 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 #include "as.h" 23 #include "subsegs.h" 24 #include "symcat.h" 25 #include "opcodes/xstormy16-desc.h" 26 #include "opcodes/xstormy16-opc.h" 27 #include "cgen.h" 28 29 /* Structure to hold all of the different components describing 30 an individual instruction. */ 31 typedef struct 32 { 33 const CGEN_INSN * insn; 34 const CGEN_INSN * orig_insn; 35 CGEN_FIELDS fields; 36 #if CGEN_INT_INSN_P 37 CGEN_INSN_INT buffer [1]; 38 #define INSN_VALUE(buf) (*(buf)) 39 #else 40 unsigned char buffer [CGEN_MAX_INSN_SIZE]; 41 #define INSN_VALUE(buf) (buf) 42 #endif 43 char * addr; 44 fragS * frag; 45 int num_fixups; 46 fixS * fixups [GAS_CGEN_MAX_FIXUPS]; 47 int indices [MAX_OPERAND_INSTANCES]; 48 } 49 xstormy16_insn; 50 51 const char comment_chars[] = ";"; 52 const char line_comment_chars[] = "#"; 53 const char line_separator_chars[] = "|"; 54 const char EXP_CHARS[] = "eE"; 55 const char FLT_CHARS[] = "dD"; 56 57 #define O_fptr_symbol (O_max + 1) 58 59 #define XSTORMY16_SHORTOPTS "" 60 const char * md_shortopts = XSTORMY16_SHORTOPTS; 61 62 struct option md_longopts[] = 63 { 64 {NULL, no_argument, NULL, 0} 65 }; 66 size_t md_longopts_size = sizeof (md_longopts); 67 68 int 69 md_parse_option (int c ATTRIBUTE_UNUSED, 70 char * arg ATTRIBUTE_UNUSED) 71 { 72 return 0; 73 } 74 75 void 76 md_show_usage (FILE * stream) 77 { 78 fprintf (stream, _(" XSTORMY16 specific command line options:\n")); 79 } 80 81 /* The target specific pseudo-ops which we support. */ 82 const pseudo_typeS md_pseudo_table[] = 83 { 84 { "word", cons, 4 }, 85 { NULL, NULL, 0 } 86 }; 87 88 89 void 90 md_begin (void) 91 { 92 /* Initialize the `cgen' interface. */ 93 94 /* Set the machine number and endian. */ 95 gas_cgen_cpu_desc = xstormy16_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0, 96 CGEN_CPU_OPEN_ENDIAN, 97 CGEN_ENDIAN_LITTLE, 98 CGEN_CPU_OPEN_END); 99 xstormy16_cgen_init_asm (gas_cgen_cpu_desc); 100 101 /* This is a callback from cgen to gas to parse operands. */ 102 cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand); 103 } 104 105 static bfd_boolean skipping_fptr = FALSE; 106 107 void 108 md_assemble (char * str) 109 { 110 xstormy16_insn insn; 111 char * errmsg; 112 113 /* Make sure that if we had an erroneous input line which triggered 114 the skipping_fptr boolean that it does not affect following lines. */ 115 skipping_fptr = FALSE; 116 117 /* Initialize GAS's cgen interface for a new instruction. */ 118 gas_cgen_init_parse (); 119 120 insn.insn = xstormy16_cgen_assemble_insn 121 (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg); 122 123 if (!insn.insn) 124 { 125 as_bad ("%s", errmsg); 126 return; 127 } 128 129 /* Doesn't really matter what we pass for RELAX_P here. */ 130 gas_cgen_finish_insn (insn.insn, insn.buffer, 131 CGEN_FIELDS_BITSIZE (& insn.fields), 0, NULL); 132 } 133 134 void 135 md_operand (expressionS * e) 136 { 137 if (*input_line_pointer != '@') 138 return; 139 140 if (strncmp (input_line_pointer + 1, "fptr", 4) == 0) 141 { 142 input_line_pointer += 5; 143 SKIP_WHITESPACE (); 144 if (*input_line_pointer != '(') 145 { 146 as_bad (_("Expected '('")); 147 goto err; 148 } 149 input_line_pointer++; 150 151 expression (e); 152 153 if (*input_line_pointer != ')') 154 { 155 as_bad (_("Missing ')'")); 156 goto err; 157 } 158 input_line_pointer++; 159 SKIP_WHITESPACE (); 160 161 if (e->X_op != O_symbol) 162 as_bad (_("Not a symbolic expression")); 163 else if (* input_line_pointer == '-') 164 /* We are computing the difference of two function pointers 165 like this: 166 167 .hword @fptr (foo) - @fptr (bar) 168 169 In this situation we do not want to generate O_fptr_symbol 170 operands because the result is an absolute value, not a 171 function pointer. 172 173 We need to make the check here, rather than when the fixup 174 is generated as the function names (foo & bar in the above 175 example) might be local symbols and we want the expression 176 to be evaluated now. This kind of thing can happen when 177 gcc is generating computed gotos. */ 178 skipping_fptr = TRUE; 179 else if (skipping_fptr) 180 skipping_fptr = FALSE; 181 else 182 e->X_op = O_fptr_symbol; 183 } 184 185 return; 186 err: 187 ignore_rest_of_line (); 188 } 189 190 /* Called while parsing data to create a fixup. 191 Create BFD_RELOC_XSTORMY16_FPTR16 relocations. */ 192 193 void 194 xstormy16_cons_fix_new (fragS *f, 195 int where, 196 int nbytes, 197 expressionS *exp) 198 { 199 bfd_reloc_code_real_type code; 200 201 if (exp->X_op == O_fptr_symbol) 202 { 203 switch (nbytes) 204 { 205 case 4: 206 /* This can happen when gcc is generating debug output. 207 For example it can create a stab with the address of 208 a function: 209 210 .stabs "foo:F(0,21)",36,0,0,@fptr(foo) 211 212 Since this does not involve switching code pages, we 213 just allow the reloc to be generated without any 214 @fptr behaviour. */ 215 exp->X_op = O_symbol; 216 code = BFD_RELOC_32; 217 break; 218 219 case 2: 220 exp->X_op = O_symbol; 221 code = BFD_RELOC_XSTORMY16_FPTR16; 222 break; 223 224 default: 225 as_bad (_("unsupported fptr fixup size %d"), nbytes); 226 return; 227 } 228 } 229 else if (nbytes == 1) 230 code = BFD_RELOC_8; 231 else if (nbytes == 2) 232 code = BFD_RELOC_16; 233 else if (nbytes == 4) 234 code = BFD_RELOC_32; 235 else 236 { 237 as_bad (_("unsupported fixup size %d"), nbytes); 238 return; 239 } 240 241 fix_new_exp (f, where, nbytes, exp, 0, code); 242 } 243 244 /* Called while parsing an instruction to create a fixup. 245 Create BFD_RELOC_XSTORMY16_FPTR16 relocations. */ 246 247 fixS * 248 xstormy16_cgen_record_fixup_exp (fragS * frag, 249 int where, 250 const CGEN_INSN * insn, 251 int length, 252 const CGEN_OPERAND * operand, 253 int opinfo, 254 expressionS * exp) 255 { 256 fixS *fixP; 257 operatorT op = exp->X_op; 258 259 if (op == O_fptr_symbol) 260 exp->X_op = O_symbol; 261 262 fixP = gas_cgen_record_fixup_exp (frag, where, insn, length, 263 operand, opinfo, exp); 264 265 if (op == O_fptr_symbol) 266 { 267 if (operand->type != XSTORMY16_OPERAND_IMM16) 268 as_bad (_("unsupported fptr fixup")); 269 else 270 { 271 fixP->fx_r_type = BFD_RELOC_XSTORMY16_FPTR16; 272 fixP->fx_where += 2; 273 } 274 } 275 276 return fixP; 277 } 278 279 valueT 280 md_section_align (segT segment, valueT size) 281 { 282 int align = bfd_get_section_alignment (stdoutput, segment); 283 284 return ((size + (1 << align) - 1) & (-1 << align)); 285 } 286 287 symbolS * 288 md_undefined_symbol (char * name ATTRIBUTE_UNUSED) 289 { 290 return 0; 291 } 292 293 /* Return an initial guess of the length by which a fragment must grow to 294 hold a branch to reach its destination. 295 Also updates fr_type/fr_subtype as necessary. 296 297 Called just before doing relaxation. 298 Any symbol that is now undefined will not become defined. 299 The guess for fr_var is ACTUALLY the growth beyond fr_fix. 300 Whatever we do to grow fr_fix or fr_var contributes to our returned value. 301 Although it may not be explicit in the frag, pretend fr_var starts with a 302 0 value. */ 303 304 int 305 md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, 306 segT segment ATTRIBUTE_UNUSED) 307 { 308 /* No assembler relaxation is defined (or necessary) for this port. */ 309 abort (); 310 } 311 312 /* *fragP has been relaxed to its final size, and now needs to have 313 the bytes inside it modified to conform to the new size. 314 315 Called after relaxation is finished. 316 fragP->fr_type == rs_machine_dependent. 317 fragP->fr_subtype is the subtype of what the address relaxed to. */ 318 319 void 320 md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED, 321 segT sec ATTRIBUTE_UNUSED, 322 fragS * fragP ATTRIBUTE_UNUSED) 323 { 324 /* No assembler relaxation is defined (or necessary) for this port. */ 325 abort (); 326 } 327 328 /* Functions concerning relocs. */ 329 330 /* The location from which a PC relative jump should be calculated, 331 given a PC relative reloc. */ 332 333 long 334 md_pcrel_from_section (fixS * fixP, segT sec) 335 { 336 if ((fixP->fx_addsy != (symbolS *) NULL 337 && (! S_IS_DEFINED (fixP->fx_addsy) 338 || S_GET_SEGMENT (fixP->fx_addsy) != sec)) 339 || xstormy16_force_relocation (fixP)) 340 /* The symbol is undefined, 341 or it is defined but not in this section, 342 or the relocation will be relative to this symbol not the section symbol. 343 Let the linker figure it out. */ 344 return 0; 345 346 return fixP->fx_frag->fr_address + fixP->fx_where; 347 } 348 349 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP. 350 Returns BFD_RELOC_NONE if no reloc type can be found. 351 *FIXP may be modified if desired. */ 352 353 bfd_reloc_code_real_type 354 md_cgen_lookup_reloc (const CGEN_INSN * insn ATTRIBUTE_UNUSED, 355 const CGEN_OPERAND * operand, 356 fixS * fixP) 357 { 358 switch (operand->type) 359 { 360 case XSTORMY16_OPERAND_IMM2: 361 case XSTORMY16_OPERAND_IMM3: 362 case XSTORMY16_OPERAND_IMM3B: 363 case XSTORMY16_OPERAND_IMM4: 364 case XSTORMY16_OPERAND_HMEM8: 365 return BFD_RELOC_NONE; 366 367 case XSTORMY16_OPERAND_IMM12: 368 fixP->fx_where += 2; 369 return BFD_RELOC_XSTORMY16_12; 370 371 case XSTORMY16_OPERAND_IMM8: 372 case XSTORMY16_OPERAND_LMEM8: 373 return fixP->fx_pcrel ? BFD_RELOC_8_PCREL : BFD_RELOC_8; 374 375 case XSTORMY16_OPERAND_IMM16: 376 /* This might have been processed at parse time. */ 377 fixP->fx_where += 2; 378 if (fixP->fx_cgen.opinfo && fixP->fx_cgen.opinfo != BFD_RELOC_NONE) 379 return fixP->fx_cgen.opinfo; 380 return fixP->fx_pcrel ? BFD_RELOC_16_PCREL : BFD_RELOC_16; 381 382 case XSTORMY16_OPERAND_ABS24: 383 return BFD_RELOC_XSTORMY16_24; 384 385 case XSTORMY16_OPERAND_REL8_4: 386 fixP->fx_addnumber -= 2; 387 case XSTORMY16_OPERAND_REL8_2: 388 fixP->fx_addnumber -= 2; 389 fixP->fx_pcrel = 1; 390 return BFD_RELOC_8_PCREL; 391 392 case XSTORMY16_OPERAND_REL12: 393 fixP->fx_where += 2; 394 /* Fall through... */ 395 case XSTORMY16_OPERAND_REL12A: 396 fixP->fx_addnumber -= 2; 397 fixP->fx_pcrel = 1; 398 return BFD_RELOC_XSTORMY16_REL_12; 399 400 default : /* avoid -Wall warning */ 401 abort (); 402 } 403 } 404 405 /* See whether we need to force a relocation into the output file. 406 This is used to force out switch and PC relative relocations when 407 relaxing. */ 408 409 int 410 xstormy16_force_relocation (fixS * fix) 411 { 412 if (fix->fx_r_type == BFD_RELOC_XSTORMY16_FPTR16) 413 return 1; 414 415 return generic_force_reloc (fix); 416 } 417 418 /* Return true if a relocation against a symbol may be replaced with 419 a relocation against section+offset. */ 420 421 bfd_boolean 422 xstormy16_fix_adjustable (fixS * fixP) 423 { 424 /* We need the symbol name for the VTABLE entries. */ 425 if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT 426 || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY) 427 return FALSE; 428 429 if (fixP->fx_r_type == BFD_RELOC_XSTORMY16_FPTR16) 430 return FALSE; 431 432 return TRUE; 433 } 434 435 /* This is a copy of gas_cgen_md_apply_fix, with some enhancements to 436 do various things that would not be valid for all ports. */ 437 438 void 439 xstormy16_md_apply_fix (fixS * fixP, 440 valueT * valueP, 441 segT seg ATTRIBUTE_UNUSED) 442 { 443 char *where = fixP->fx_frag->fr_literal + fixP->fx_where; 444 valueT value = *valueP; 445 /* Canonical name, since used a lot. */ 446 CGEN_CPU_DESC cd = gas_cgen_cpu_desc; 447 448 /* md_cgen_lookup_reloc() will adjust this to compensate for where 449 in the opcode the relocation happens, for pcrel relocations. We 450 have no other way of keeping track of what this offset needs to 451 be. */ 452 fixP->fx_addnumber = 0; 453 454 /* This port has pc-relative relocs and DIFF_EXPR_OK defined, so 455 it must deal with turning a BFD_RELOC_{8,16,32,64} into a 456 BFD_RELOC_*_PCREL for the case of 457 458 .word something-. */ 459 if (fixP->fx_pcrel) 460 switch (fixP->fx_r_type) 461 { 462 case BFD_RELOC_8: 463 fixP->fx_r_type = BFD_RELOC_8_PCREL; 464 break; 465 case BFD_RELOC_16: 466 fixP->fx_r_type = BFD_RELOC_16_PCREL; 467 break; 468 case BFD_RELOC_32: 469 fixP->fx_r_type = BFD_RELOC_32_PCREL; 470 break; 471 case BFD_RELOC_64: 472 fixP->fx_r_type = BFD_RELOC_64_PCREL; 473 break; 474 default: 475 break; 476 } 477 478 if (fixP->fx_addsy == (symbolS *) NULL) 479 fixP->fx_done = 1; 480 481 /* We don't actually support subtracting a symbol. */ 482 if (fixP->fx_subsy != (symbolS *) NULL) 483 as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex")); 484 485 if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED) 486 { 487 int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED; 488 const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex); 489 const char *errmsg; 490 bfd_reloc_code_real_type reloc_type; 491 CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd)); 492 const CGEN_INSN *insn = fixP->fx_cgen.insn; 493 494 /* If the reloc has been fully resolved finish the operand here. */ 495 /* FIXME: This duplicates the capabilities of code in BFD. */ 496 if (fixP->fx_done) 497 { 498 CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn)); 499 CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value); 500 501 #if CGEN_INT_INSN_P 502 { 503 CGEN_INSN_INT insn_value = 504 cgen_get_insn_value (cd, (unsigned char *) where, 505 CGEN_INSN_BITSIZE (insn)); 506 507 /* ??? 0 is passed for `pc'. */ 508 errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, 509 &insn_value, (bfd_vma) 0); 510 cgen_put_insn_value (cd, (unsigned char *) where, 511 CGEN_INSN_BITSIZE (insn), insn_value); 512 } 513 #else 514 /* ??? 0 is passed for `pc'. */ 515 errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, 516 (unsigned char *) where, 517 (bfd_vma) 0); 518 #endif 519 if (errmsg) 520 as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg); 521 } 522 523 if (fixP->fx_done) 524 return; 525 526 /* The operand isn't fully resolved. Determine a BFD reloc value 527 based on the operand information and leave it to 528 bfd_install_relocation. Note that this doesn't work when 529 !partial_inplace. */ 530 531 reloc_type = md_cgen_lookup_reloc (insn, operand, fixP); 532 if (reloc_type != BFD_RELOC_NONE) 533 fixP->fx_r_type = reloc_type; 534 else 535 { 536 as_bad_where (fixP->fx_file, fixP->fx_line, 537 _("unresolved expression that must be resolved")); 538 fixP->fx_done = 1; 539 return; 540 } 541 } 542 else if (fixP->fx_done) 543 { 544 /* We're finished with this fixup. Install it because 545 bfd_install_relocation won't be called to do it. */ 546 switch (fixP->fx_r_type) 547 { 548 case BFD_RELOC_8: 549 md_number_to_chars (where, value, 1); 550 break; 551 case BFD_RELOC_16: 552 md_number_to_chars (where, value, 2); 553 break; 554 case BFD_RELOC_32: 555 md_number_to_chars (where, value, 4); 556 break; 557 case BFD_RELOC_64: 558 md_number_to_chars (where, value, 8); 559 break; 560 default: 561 as_bad_where (fixP->fx_file, fixP->fx_line, 562 _("internal error: can't install fix for reloc type %d (`%s')"), 563 fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type)); 564 break; 565 } 566 } 567 else 568 { 569 /* bfd_install_relocation will be called to finish things up. */ 570 } 571 572 /* This is a RELA port. Thus, it does not need to store a 573 value if it is going to make a reloc. What's more, when 574 assembling a line like 575 576 .byte global-0x7f00 577 578 we'll get a spurious error message if we try to stuff 0x7f00 into 579 the byte. */ 580 if (! fixP->fx_done) 581 *valueP = 0; 582 583 /* Tuck `value' away for use by tc_gen_reloc. 584 See the comment describing fx_addnumber in write.h. 585 This field is misnamed (or misused :-). */ 586 fixP->fx_addnumber += value; 587 } 588 589 590 /* Write a value out to the object file, using the appropriate endianness. */ 591 592 void 593 md_number_to_chars (char * buf, valueT val, int n) 594 { 595 number_to_chars_littleendian (buf, val, n); 596 } 597 598 char * 599 md_atof (int type, char * litP, int * sizeP) 600 { 601 return ieee_md_atof (type, litP, sizeP, FALSE); 602 } 603