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_2:
 356     case XSTORMY16_OPERAND_REL8_4:
 357       fixP->fx_pcrel = 1;
 358       return BFD_RELOC_8_PCREL;
 359
 360     case XSTORMY16_OPERAND_REL12:
 361       fixP->fx_where += 2;
 362       /* Fall through...  */
 363     case XSTORMY16_OPERAND_REL12A:
 364       fixP->fx_pcrel = 1;
 365       return BFD_RELOC_XSTORMY16_REL_12;
 366
 367     default : /* avoid -Wall warning */
 368       abort ();
 369     }
 370 }
 371
 372 /* See whether we need to force a relocation into the output file.
 373    This is used to force out switch and PC relative relocations when
 374    relaxing.  */
 375
 376 int
 377 xstormy16_force_relocation (fix)
 378      fixS * fix;
 379 {
 380   switch (fix->fx_r_type)
 381     {
 382     case BFD_RELOC_XSTORMY16_FPTR16:
 383     case BFD_RELOC_VTABLE_INHERIT:
 384     case BFD_RELOC_VTABLE_ENTRY:
 385       return 1;
 386
 387     default:
 388       break;
 389     }
 390
 391   return S_FORCE_RELOC (fix->fx_addsy);
 392 }
 393
 394 /* Return true if a relocation against a symbol may be replaced with
 395    a relocation against section+offset.  */
 396
 397 bfd_boolean
 398 xstormy16_fix_adjustable (fixP)
 399    fixS * fixP;
 400 {
 401   /* We need the symbol name for the VTABLE entries.  */
 402   if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 403       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 404     return 0;
 405
 406   if (fixP->fx_r_type == BFD_RELOC_XSTORMY16_FPTR16)
 407     return 0;
 408
 409   return 1;
 410 }
 411
 412 /* This is a copy of gas_cgen_md_apply_fix3, with some enhancements to
 413    do various things that would not be valid for all ports.  */
 414
 415 void
 416 xstormy16_md_apply_fix3 (fixP, valueP, seg)
 417      fixS *   fixP;
 418      valueT * valueP;
 419      segT     seg ATTRIBUTE_UNUSED;
 420 {
 421   char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
 422   valueT value = *valueP;
 423   /* Canonical name, since used a lot.  */
 424   CGEN_CPU_DESC cd = gas_cgen_cpu_desc;
 425
 426   /* This port has pc-relative relocs and DIFF_EXPR_OK defined, so
 427      it must deal with turning a BFD_RELOC_{8,16,32,64} into a
 428      BFD_RELOC_*_PCREL for the case of
 429
 430         .word something-.
 431   */
 432   if (fixP->fx_pcrel)
 433     switch (fixP->fx_r_type)
 434       {
 435       case BFD_RELOC_8:
 436         fixP->fx_r_type = BFD_RELOC_8_PCREL;
 437         break;
 438       case BFD_RELOC_16:
 439         fixP->fx_r_type = BFD_RELOC_16_PCREL;
 440         break;
 441       case BFD_RELOC_32:
 442         fixP->fx_r_type = BFD_RELOC_32_PCREL;
 443         break;
 444       case BFD_RELOC_64:
 445         fixP->fx_r_type = BFD_RELOC_64_PCREL;
 446         break;
 447       default:
 448         break;
 449       }
 450
 451   if (fixP->fx_addsy == (symbolS *) NULL)
 452     fixP->fx_done = 1;
 453
 454   /* We don't actually support subtracting a symbol.  */
 455   if (fixP->fx_subsy != (symbolS *) NULL)
 456     as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex"));
 457
 458   if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
 459     {
 460       int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
 461       const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex);
 462       const char *errmsg;
 463       bfd_reloc_code_real_type reloc_type;
 464       CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd));
 465       const CGEN_INSN *insn = fixP->fx_cgen.insn;
 466
 467       /* If the reloc has been fully resolved finish the operand here.  */
 468       /* FIXME: This duplicates the capabilities of code in BFD.  */
 469       if (fixP->fx_done)
 470         {
 471           CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn));
 472           CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value);
 473
 474 #if CGEN_INT_INSN_P
 475           {
 476             CGEN_INSN_INT insn_value =
 477               cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn));
 478
 479             /* ??? 0 is passed for `pc'.  */
 480             errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
 481                                                    &insn_value, (bfd_vma) 0);
 482             cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn),
 483                                  insn_value);
 484           }
 485 #else
 486           /* ??? 0 is passed for `pc'.  */
 487           errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where,
 488                                                  (bfd_vma) 0);
 489 #endif
 490           if (errmsg)
 491             as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
 492         }
 493
 494       if (fixP->fx_done)
 495         return;
 496
 497       /* The operand isn't fully resolved.  Determine a BFD reloc value
 498          based on the operand information and leave it to
 499          bfd_install_relocation.  Note that this doesn't work when
 500          !partial_inplace.  */
 501
 502       reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
 503       if (reloc_type != BFD_RELOC_NONE)
 504         {
 505           fixP->fx_r_type = reloc_type;
 506         }
 507       else
 508         {
 509           as_bad_where (fixP->fx_file, fixP->fx_line,
 510                         _("unresolved expression that must be resolved"));
 511           fixP->fx_done = 1;
 512           return;
 513         }
 514     }
 515   else if (fixP->fx_done)
 516     {
 517       /* We're finished with this fixup.  Install it because
 518          bfd_install_relocation won't be called to do it.  */
 519       switch (fixP->fx_r_type)
 520         {
 521         case BFD_RELOC_8:
 522           md_number_to_chars (where, value, 1);
 523           break;
 524         case BFD_RELOC_16:
 525           md_number_to_chars (where, value, 2);
 526           break;
 527         case BFD_RELOC_32:
 528           md_number_to_chars (where, value, 4);
 529           break;
 530         case BFD_RELOC_64:
 531           md_number_to_chars (where, value, 8);
 532           break;
 533         default:
 534           as_bad_where (fixP->fx_file, fixP->fx_line,
 535                         _("internal error: can't install fix for reloc type %d (`%s')"),
 536                         fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
 537           break;
 538         }
 539     }
 540   else
 541     {
 542       /* bfd_install_relocation will be called to finish things up.  */
 543     }
 544
 545   /* This is a RELA port.  Thus, it does not need to store a
 546      value if it is going to make a reloc.  What's more, when
 547      assembling a line like
 548
 549      .byte global-0x7f00
 550
 551      we'll get a spurious error message if we try to stuff 0x7f00 into
 552      the byte.  */
 553   if (! fixP->fx_done)
 554     *valueP = 0;
 555
 556   /* Tuck `value' away for use by tc_gen_reloc.
 557      See the comment describing fx_addnumber in write.h.
 558      This field is misnamed (or misused :-).  */
 559   fixP->fx_addnumber = value;
 560 }
 561
 562 \f
 563 /* Write a value out to the object file, using the appropriate endianness.  */
 564
 565 void
 566 md_number_to_chars (buf, val, n)
 567      char * buf;
 568      valueT val;
 569      int    n;
 570 {
 571   number_to_chars_littleendian (buf, val, n);
 572 }
 573
 574 /* Turn a string in input_line_pointer into a floating point constant of type
 575    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 576    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.
 577 */
 578
 579 /* Equal to MAX_PRECISION in atof-ieee.c */
 580 #define MAX_LITTLENUMS 6
 581
 582 char *
 583 md_atof (type, litP, sizeP)
 584      char   type;
 585      char * litP;
 586      int *  sizeP;
 587 {
 588   int              prec;
 589   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 590   LITTLENUM_TYPE   *wordP;
 591   char *           t;
 592
 593   switch (type)
 594     {
 595     case 'f':
 596     case 'F':
 597       prec = 2;
 598       break;
 599
 600     case 'd':
 601     case 'D':
 602       prec = 4;
 603       break;
 604
 605    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 606
 607     default:
 608       * sizeP = 0;
 609       return _("Bad call to md_atof()");
 610     }
 611
 612   t = atof_ieee (input_line_pointer, type, words);
 613   if (t)
 614     input_line_pointer = t;
 615   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 616
 617   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 618   /* This loops outputs the LITTLENUMs in REVERSE order; in accord with
 619      the littleendianness of the processor.  */
 620   for (wordP = words + prec - 1; prec--;)
 621     {
 622       md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
 623       litP += sizeof (LITTLENUM_TYPE);
 624     }
 625
 626   return 0;
 627 }