gas/config/tc-xstormy16.c

   1 /* tc-xstormy16.c -- Assembler for the Sanyo XSTORMY16.
   2    Copyright 2000, 2001, 2002 Free Software Foundation.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <stdio.h>
  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 \f
  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 (c, arg)
  70      int    c ATTRIBUTE_UNUSED;
  71      char * arg ATTRIBUTE_UNUSED;
  72 {
  73   return 0;
  74 }
  75
  76 void
  77 md_show_usage (stream)
  78   FILE * stream;
  79 {
  80   fprintf (stream, _(" XSTORMY16 specific command line options:\n"));
  81 }
  82
  83 /* The target specific pseudo-ops which we support.  */
  84 const pseudo_typeS md_pseudo_table[] =
  85 {
  86   { "word",     cons,           4 },
  87   { NULL,       NULL,           0 }
  88 };
  89
  90 \f
  91 void
  92 md_begin ()
  93 {
  94   /* Initialize the `cgen' interface.  */
  95
  96   /* Set the machine number and endian.  */
  97   gas_cgen_cpu_desc = xstormy16_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
  98                                           CGEN_CPU_OPEN_ENDIAN,
  99                                           CGEN_ENDIAN_LITTLE,
 100                                           CGEN_CPU_OPEN_END);
 101   xstormy16_cgen_init_asm (gas_cgen_cpu_desc);
 102
 103   /* This is a callback from cgen to gas to parse operands.  */
 104   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 105 }
 106
 107 void
 108 md_assemble (str)
 109      char * str;
 110 {
 111   xstormy16_insn insn;
 112   char *    errmsg;
 113
 114   /* Initialize GAS's cgen interface for a new instruction.  */
 115   gas_cgen_init_parse ();
 116
 117   insn.insn = xstormy16_cgen_assemble_insn
 118     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 119
 120   if (!insn.insn)
 121     {
 122       as_bad (errmsg);
 123       return;
 124     }
 125
 126   /* Doesn't really matter what we pass for RELAX_P here.  */
 127   gas_cgen_finish_insn (insn.insn, insn.buffer,
 128                         CGEN_FIELDS_BITSIZE (& insn.fields), 0, NULL);
 129 }
 130
 131 void
 132 md_operand (e)
 133      expressionS * e;
 134 {
 135   if (*input_line_pointer != '@')
 136     return;
 137
 138   if (strncmp (input_line_pointer+1, "fptr", 4) == 0)
 139     {
 140       input_line_pointer += 5;
 141       SKIP_WHITESPACE ();
 142       if (*input_line_pointer != '(')
 143         {
 144           as_bad ("Expected '('");
 145           goto err;
 146         }
 147       input_line_pointer++;
 148
 149       expression (e);
 150
 151       if (*input_line_pointer != ')')
 152         {
 153           as_bad ("Missing ')'");
 154           goto err;
 155         }
 156       input_line_pointer++;
 157
 158       if (e->X_op != O_symbol)
 159         as_bad ("Not a symbolic expression");
 160       else
 161         e->X_op = O_fptr_symbol;
 162     }
 163
 164   return;
 165  err:
 166   ignore_rest_of_line ();
 167 }
 168
 169 /* Called while parsing data to create a fixup.
 170    Create BFD_RELOC_XSTORMY16_FPTR16 relocations.  */
 171
 172 void
 173 xstormy16_cons_fix_new (f, where, nbytes, exp)
 174      fragS *f;
 175      int where;
 176      int nbytes;
 177      expressionS *exp;
 178 {
 179   bfd_reloc_code_real_type code;
 180   fixS *fix;
 181
 182   if (exp->X_op == O_fptr_symbol)
 183     {
 184       if (nbytes != 2)
 185         {
 186           as_bad ("unsupported fptr fixup size %d", nbytes);
 187           return;
 188         }
 189       exp->X_op = O_symbol;
 190       code = BFD_RELOC_XSTORMY16_FPTR16;
 191     }
 192   else if (nbytes == 1)
 193     code = BFD_RELOC_8;
 194   else if (nbytes == 2)
 195     code = BFD_RELOC_16;
 196   else if (nbytes == 4)
 197     code = BFD_RELOC_32;
 198   else
 199     {
 200       as_bad ("unsupported fixup size %d", nbytes);
 201       return;
 202     }
 203
 204   fix = fix_new_exp (f, where, nbytes, exp, 0, code);
 205 }
 206
 207 /* Called while parsing an instruction to create a fixup.
 208    Create BFD_RELOC_XSTORMY16_FPTR16 relocations.  */
 209
 210 fixS *
 211 xstormy16_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp)
 212      fragS *              frag;
 213      int                  where;
 214      const CGEN_INSN *    insn;
 215      int                  length;
 216      const CGEN_OPERAND * operand;
 217      int                  opinfo;
 218      expressionS *        exp;
 219 {
 220   fixS *fixP;
 221   operatorT op = exp->X_op;
 222
 223   if (op == O_fptr_symbol)
 224     exp->X_op = O_symbol;
 225
 226   fixP = gas_cgen_record_fixup_exp (frag, where, insn, length,
 227                                     operand, opinfo, exp);
 228
 229   if (op == O_fptr_symbol)
 230     {
 231       if (operand->type != XSTORMY16_OPERAND_IMM16)
 232         as_bad ("unsupported fptr fixup");
 233       else
 234         {
 235           fixP->fx_r_type = BFD_RELOC_XSTORMY16_FPTR16;
 236           fixP->fx_where += 2;
 237         }
 238     }
 239
 240   return fixP;
 241 }
 242
 243 valueT
 244 md_section_align (segment, size)
 245      segT   segment;
 246      valueT size;
 247 {
 248   int align = bfd_get_section_alignment (stdoutput, segment);
 249   return ((size + (1 << align) - 1) & (-1 << align));
 250 }
 251
 252 symbolS *
 253 md_undefined_symbol (name)
 254   char * name ATTRIBUTE_UNUSED;
 255 {
 256   return 0;
 257 }
 258 \f
 259 /* Return an initial guess of the length by which a fragment must grow to
 260    hold a branch to reach its destination.
 261    Also updates fr_type/fr_subtype as necessary.
 262
 263    Called just before doing relaxation.
 264    Any symbol that is now undefined will not become defined.
 265    The guess for fr_var is ACTUALLY the growth beyond fr_fix.
 266    Whatever we do to grow fr_fix or fr_var contributes to our returned value.
 267    Although it may not be explicit in the frag, pretend fr_var starts with a
 268    0 value.  */
 269
 270 int
 271 md_estimate_size_before_relax (fragP, segment)
 272      fragS * fragP ATTRIBUTE_UNUSED;
 273      segT    segment ATTRIBUTE_UNUSED;
 274 {
 275   /* No assembler relaxation is defined (or necessary) for this port.  */
 276   abort ();
 277 }
 278
 279 /* *fragP has been relaxed to its final size, and now needs to have
 280    the bytes inside it modified to conform to the new size.
 281
 282    Called after relaxation is finished.
 283    fragP->fr_type == rs_machine_dependent.
 284    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 285
 286 void
 287 md_convert_frag (abfd, sec, fragP)
 288   bfd *   abfd ATTRIBUTE_UNUSED;
 289   segT    sec ATTRIBUTE_UNUSED;
 290   fragS * fragP ATTRIBUTE_UNUSED;
 291 {
 292   /* No assembler relaxation is defined (or necessary) for this port.  */
 293   abort ();
 294 }
 295 \f
 296 /* Functions concerning relocs.  */
 297
 298 /* The location from which a PC relative jump should be calculated,
 299    given a PC relative reloc.  */
 300
 301 long
 302 md_pcrel_from_section (fixP, sec)
 303      fixS * fixP;
 304      segT   sec;
 305 {
 306   if (fixP->fx_addsy != (symbolS *) NULL
 307       && (! S_IS_DEFINED (fixP->fx_addsy)
 308           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 309     {
 310       /* The symbol is undefined (or is defined but not in this section).
 311          Let the linker figure it out.  */
 312       return 0;
 313     }
 314
 315   return fixP->fx_frag->fr_address + fixP->fx_where;
 316 }
 317
 318 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 319    Returns BFD_RELOC_NONE if no reloc type can be found.
 320    *FIXP may be modified if desired.  */
 321
 322 bfd_reloc_code_real_type
 323 md_cgen_lookup_reloc (insn, operand, fixP)
 324      const CGEN_INSN *    insn ATTRIBUTE_UNUSED;
 325      const CGEN_OPERAND * operand;
 326      fixS *               fixP;
 327 {
 328   switch (operand->type)
 329     {
 330     case XSTORMY16_OPERAND_IMM2:
 331     case XSTORMY16_OPERAND_IMM3:
 332     case XSTORMY16_OPERAND_IMM3B:
 333     case XSTORMY16_OPERAND_IMM4:
 334     case XSTORMY16_OPERAND_HMEM8:
 335       return BFD_RELOC_NONE;
 336
 337     case XSTORMY16_OPERAND_IMM12:
 338       fixP->fx_where += 2;
 339       return BFD_RELOC_XSTORMY16_12;
 340
 341     case XSTORMY16_OPERAND_IMM8:
 342     case XSTORMY16_OPERAND_LMEM8:
 343       return fixP->fx_pcrel ? BFD_RELOC_8_PCREL : BFD_RELOC_8;
 344
 345     case XSTORMY16_OPERAND_IMM16:
 346       /* This might have been processed at parse time.  */
 347       fixP->fx_where += 2;
 348       if (fixP->fx_cgen.opinfo && fixP->fx_cgen.opinfo != BFD_RELOC_NONE)
 349         return fixP->fx_cgen.opinfo;
 350       return fixP->fx_pcrel ? BFD_RELOC_16_PCREL : BFD_RELOC_16;
 351
 352     case XSTORMY16_OPERAND_ABS24:
 353       return BFD_RELOC_XSTORMY16_24;
 354
 355     case XSTORMY16_OPERAND_REL8_4:
 356       fixP->fx_addnumber -= 2;
 357     case XSTORMY16_OPERAND_REL8_2:
 358       fixP->fx_addnumber -= 2;
 359       fixP->fx_pcrel = 1;
 360       return BFD_RELOC_8_PCREL;
 361
 362     case XSTORMY16_OPERAND_REL12:
 363       fixP->fx_where += 2;
 364       /* Fall through...  */
 365     case XSTORMY16_OPERAND_REL12A:
 366       fixP->fx_addnumber -= 2;
 367       fixP->fx_pcrel = 1;
 368       return BFD_RELOC_XSTORMY16_REL_12;
 369
 370     default : /* avoid -Wall warning */
 371       abort ();
 372     }
 373 }
 374
 375 /* See whether we need to force a relocation into the output file.
 376    This is used to force out switch and PC relative relocations when
 377    relaxing.  */
 378
 379 int
 380 xstormy16_force_relocation (fix)
 381      fixS * fix;
 382 {
 383   switch (fix->fx_r_type)
 384     {
 385     case BFD_RELOC_XSTORMY16_FPTR16:
 386     case BFD_RELOC_VTABLE_INHERIT:
 387     case BFD_RELOC_VTABLE_ENTRY:
 388       return 1;
 389
 390     default:
 391       break;
 392     }
 393
 394   return S_FORCE_RELOC (fix->fx_addsy);
 395 }
 396
 397 /* Return true if a relocation against a symbol may be replaced with
 398    a relocation against section+offset.  */
 399
 400 bfd_boolean
 401 xstormy16_fix_adjustable (fixP)
 402    fixS * fixP;
 403 {
 404   /* We need the symbol name for the VTABLE entries.  */
 405   if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 406       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 407     return 0;
 408
 409   if (fixP->fx_r_type == BFD_RELOC_XSTORMY16_FPTR16)
 410     return 0;
 411
 412   return 1;
 413 }
 414
 415 /* This is a copy of gas_cgen_md_apply_fix3, with some enhancements to
 416    do various things that would not be valid for all ports.  */
 417
 418 void
 419 xstormy16_md_apply_fix3 (fixP, valueP, seg)
 420      fixS *   fixP;
 421      valueT * valueP;
 422      segT     seg ATTRIBUTE_UNUSED;
 423 {
 424   char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
 425   valueT value = *valueP;
 426   /* Canonical name, since used a lot.  */
 427   CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
 428
 429   /* md_cgen_lookup_reloc() will adjust this to compensate for where
 430      in the opcode the relocation happens, for pcrel relocations.  We
 431      have no other way of keeping track of what this offset needs to
 432      be.  */
 433   fixP->fx_addnumber = 0;
 434
 435   /* This port has pc-relative relocs and DIFF_EXPR_OK defined, so
 436      it must deal with turning a BFD_RELOC_{8,16,32,64} into a
 437      BFD_RELOC_*_PCREL for the case of
 438
 439         .word something-.
 440   */
 441   if (fixP->fx_pcrel)
 442     switch (fixP->fx_r_type)
 443       {
 444       case BFD_RELOC_8:
 445         fixP->fx_r_type = BFD_RELOC_8_PCREL;
 446         break;
 447       case BFD_RELOC_16:
 448         fixP->fx_r_type = BFD_RELOC_16_PCREL;
 449         break;
 450       case BFD_RELOC_32:
 451         fixP->fx_r_type = BFD_RELOC_32_PCREL;
 452         break;
 453       case BFD_RELOC_64:
 454         fixP->fx_r_type = BFD_RELOC_64_PCREL;
 455         break;
 456       default:
 457         break;
 458       }
 459
 460   if (fixP->fx_addsy == (symbolS *) NULL)
 461     fixP->fx_done = 1;
 462
 463   /* We don't actually support subtracting a symbol.  */
 464   if (fixP->fx_subsy != (symbolS *) NULL)
 465     as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex"));
 466
 467   if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
 468     {
 469       int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
 470       const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex);
 471       const char *errmsg;
 472       bfd_reloc_code_real_type reloc_type;
 473       CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd));
 474       const CGEN_INSN *insn = fixP->fx_cgen.insn;
 475
 476       /* If the reloc has been fully resolved finish the operand here.  */
 477       /* FIXME: This duplicates the capabilities of code in BFD.  */
 478       if (fixP->fx_done)
 479         {
 480           CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn));
 481           CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value);
 482
 483 #if CGEN_INT_INSN_P
 484           {
 485             CGEN_INSN_INT insn_value =
 486               cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn));
 487
 488             /* ??? 0 is passed for `pc'.  */
 489             errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
 490                                                    &insn_value, (bfd_vma) 0);
 491             cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn),
 492                                  insn_value);
 493           }
 494 #else
 495           /* ??? 0 is passed for `pc'.  */
 496           errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where,
 497                                                  (bfd_vma) 0);
 498 #endif
 499           if (errmsg)
 500             as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
 501         }
 502
 503       if (fixP->fx_done)
 504         return;
 505
 506       /* The operand isn't fully resolved.  Determine a BFD reloc value
 507          based on the operand information and leave it to
 508          bfd_install_relocation.  Note that this doesn't work when
 509          !partial_inplace.  */
 510
 511       reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
 512       if (reloc_type != BFD_RELOC_NONE)
 513         {
 514           fixP->fx_r_type = reloc_type;
 515         }
 516       else
 517         {
 518           as_bad_where (fixP->fx_file, fixP->fx_line,
 519                         _("unresolved expression that must be resolved"));
 520           fixP->fx_done = 1;
 521           return;
 522         }
 523     }
 524   else if (fixP->fx_done)
 525     {
 526       /* We're finished with this fixup.  Install it because
 527          bfd_install_relocation won't be called to do it.  */
 528       switch (fixP->fx_r_type)
 529         {
 530         case BFD_RELOC_8:
 531           md_number_to_chars (where, value, 1);
 532           break;
 533         case BFD_RELOC_16:
 534           md_number_to_chars (where, value, 2);
 535           break;
 536         case BFD_RELOC_32:
 537           md_number_to_chars (where, value, 4);
 538           break;
 539         case BFD_RELOC_64:
 540           md_number_to_chars (where, value, 8);
 541           break;
 542         default:
 543           as_bad_where (fixP->fx_file, fixP->fx_line,
 544                         _("internal error: can't install fix for reloc type %d (`%s')"),
 545                         fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
 546           break;
 547         }
 548     }
 549   else
 550     {
 551       /* bfd_install_relocation will be called to finish things up.  */
 552     }
 553
 554   /* This is a RELA port.  Thus, it does not need to store a
 555      value if it is going to make a reloc.  What's more, when
 556      assembling a line like
 557
 558      .byte global-0x7f00
 559
 560      we'll get a spurious error message if we try to stuff 0x7f00 into
 561      the byte.  */
 562   if (! fixP->fx_done)
 563     *valueP = 0;
 564
 565   /* Tuck `value' away for use by tc_gen_reloc.
 566      See the comment describing fx_addnumber in write.h.
 567      This field is misnamed (or misused :-).  */
 568   fixP->fx_addnumber += value;
 569 }
 570
 571 \f
 572 /* Write a value out to the object file, using the appropriate endianness.  */
 573
 574 void
 575 md_number_to_chars (buf, val, n)
 576      char * buf;
 577      valueT val;
 578      int    n;
 579 {
 580   number_to_chars_littleendian (buf, val, n);
 581 }
 582
 583 /* Turn a string in input_line_pointer into a floating point constant of type
 584    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 585    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 586 */
 587
 588 /* Equal to MAX_PRECISION in atof-ieee.c */
 589 #define MAX_LITTLENUMS 6
 590
 591 char *
 592 md_atof (type, litP, sizeP)
 593      char   type;
 594      char * litP;
 595      int *  sizeP;
 596 {
 597   int              prec;
 598   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 599   LITTLENUM_TYPE   *wordP;
 600   char *           t;
 601
 602   switch (type)
 603     {
 604     case 'f':
 605     case 'F':
 606       prec = 2;
 607       break;
 608
 609     case 'd':
 610     case 'D':
 611       prec = 4;
 612       break;
 613
 614    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 615
 616     default:
 617       * sizeP = 0;
 618       return _("Bad call to md_atof()");
 619     }
 620
 621   t = atof_ieee (input_line_pointer, type, words);
 622   if (t)
 623     input_line_pointer = t;
 624   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 625
 626   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 627   /* This loops outputs the LITTLENUMs in REVERSE order; in accord with
 628      the littleendianness of the processor.  */
 629   for (wordP = words + prec - 1; prec--;)
 630     {
 631       md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
 632       litP += sizeof (LITTLENUM_TYPE);
 633     }
 634
 635   return 0;
 636 }