opcodes/epiphany-asm.c

   1 /* Assembler interface for targets using CGEN. -*- C -*-
   2    CGEN: Cpu tools GENerator
   3
   4    THIS FILE IS MACHINE GENERATED WITH CGEN.
   5    - the resultant file is machine generated, cgen-asm.in isn't
   6
   7    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2005, 2007, 2008, 2010
   8    Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26
  27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  28    Keep that in mind.  */
  29
  30 #include "sysdep.h"
  31 #include <stdio.h>
  32 #include "ansidecl.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "epiphany-desc.h"
  36 #include "epiphany-opc.h"
  37 #include "opintl.h"
  38 #include "xregex.h"
  39 #include "libiberty.h"
  40 #include "safe-ctype.h"
  41
  42 #undef  min
  43 #define min(a,b) ((a) < (b) ? (a) : (b))
  44 #undef  max
  45 #define max(a,b) ((a) > (b) ? (a) : (b))
  46
  47 static const char * parse_insn_normal
  48   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  49 \f
  50 /* -- assembler routines inserted here.  */
  51
  52 /* -- asm.c */
  53 const char *
  54 parse_shortregs (CGEN_CPU_DESC cd,
  55                  const char ** strp,
  56                  CGEN_KEYWORD * keywords,
  57                  long * regno)
  58 {
  59   const char * errmsg;
  60
  61   /* Parse register.  */
  62   errmsg = cgen_parse_keyword (cd, strp, keywords, regno);
  63
  64   if (errmsg)
  65     return errmsg;
  66
  67   if (*regno > 7)
  68     errmsg = _("register unavailable for short instructions");
  69
  70   return errmsg;
  71 }
  72
  73 static const char * parse_simm_not_reg (CGEN_CPU_DESC, const char **, int,
  74                                         long *);
  75
  76 static const char *
  77 parse_uimm_not_reg (CGEN_CPU_DESC cd,
  78                     const char ** strp,
  79                     int opindex,
  80                     unsigned long * valuep)
  81 {
  82   long * svalp = (void *) valuep;
  83   return parse_simm_not_reg (cd, strp, opindex, svalp);
  84 }
  85
  86 /* Handle simm3/simm11/imm3/imm12.  */
  87
  88 static const char *
  89 parse_simm_not_reg (CGEN_CPU_DESC cd,
  90                    const char ** strp,
  91                    int opindex,
  92                    long * valuep)
  93 {
  94   const char * errmsg;
  95
  96   int   sign = 0;
  97   int   bits = 0;
  98
  99   switch (opindex)
 100     {
 101     case EPIPHANY_OPERAND_SIMM3:
 102       sign = 1; bits = 3; break;
 103     case EPIPHANY_OPERAND_SIMM11:
 104       sign = 1; bits = 11; break;
 105     case EPIPHANY_OPERAND_DISP3:
 106       sign = 0; bits = 3; break;
 107     case EPIPHANY_OPERAND_DISP11:
 108       /* Load/store displacement is a sign-magnitude 12 bit value.  */
 109       sign = 0; bits = 11; break;
 110     }
 111
 112   /* First try to parse as a register name and reject the operand.  */
 113   errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names,valuep);
 114   if (!errmsg)
 115     return _("register name used as immediate value");
 116
 117   errmsg = (sign ? cgen_parse_signed_integer (cd, strp, opindex, valuep)
 118             : cgen_parse_unsigned_integer (cd, strp, opindex,
 119                                           (unsigned long *) valuep));
 120   if (errmsg)
 121     return errmsg;
 122
 123   if (sign)
 124     errmsg = cgen_validate_signed_integer (*valuep,
 125                                           -((1L << bits) - 1), (1 << (bits - 1)) - 1);
 126   else
 127     errmsg = cgen_validate_unsigned_integer (*valuep, 0, (1L << bits) - 1);
 128
 129   return errmsg;
 130 }
 131
 132 static const char *
 133 parse_postindex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 134                  const char ** strp,
 135                  int opindex ATTRIBUTE_UNUSED,
 136                  unsigned long *valuep)
 137 {
 138   if (**strp == '#')
 139     ++*strp;                    /* Skip leading hashes.  */
 140
 141   if (**strp == '-')
 142     {
 143       *valuep = 1;
 144       ++*strp;
 145     }
 146   else if (**strp == '+')
 147     {
 148       *valuep = 0;
 149       ++*strp;
 150     }
 151   else
 152     *valuep = 0;
 153
 154   return NULL;
 155 }
 156
 157 static const char *
 158 parse_imm8 (CGEN_CPU_DESC cd,
 159             const char ** strp,
 160             int opindex,
 161             bfd_reloc_code_real_type code,
 162             enum cgen_parse_operand_result * result_type,
 163             bfd_vma * valuep)
 164 {
 165   const char * errmsg;
 166   enum cgen_parse_operand_result rt;
 167   long dummyval;
 168
 169   if (!result_type)
 170     result_type = &rt;
 171
 172   code = BFD_RELOC_NONE;
 173
 174   if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names, &dummyval)
 175       || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names,
 176                               &dummyval))
 177     /* Don't treat "mov ip,ip" as a move-immediate.  */
 178     return _("register source in immediate move");
 179
 180   errmsg = cgen_parse_address (cd, strp, opindex, code, result_type, valuep);
 181   if (errmsg)
 182     return errmsg;
 183
 184   if (*result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 185     errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xff);
 186   else
 187     errmsg = _("byte relocation unsupported");
 188
 189   *valuep &= 0xff;
 190   return errmsg;
 191 }
 192
 193 static const char * MISSING_CLOSE_PARENTHESIS = N_("missing `)'");
 194
 195 static const char *
 196 parse_imm16 (CGEN_CPU_DESC cd,
 197              const char ** strp,
 198              int opindex,
 199              bfd_reloc_code_real_type code ATTRIBUTE_UNUSED,
 200              enum cgen_parse_operand_result * result_type,
 201              bfd_vma * valuep)
 202 {
 203   const char * errmsg;
 204   enum cgen_parse_operand_result rt;
 205   long dummyval;
 206
 207   if (!result_type)
 208     result_type = &rt;
 209
 210   if (strncasecmp (*strp, "%high(", 6) == 0)
 211     {
 212       *strp += 6;
 213       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_HIGH,
 214                                    result_type, valuep);
 215       if (**strp != ')')
 216         return MISSING_CLOSE_PARENTHESIS;
 217       ++*strp;
 218       *valuep >>= 16;
 219     }
 220   else if (strncasecmp (*strp, "%low(", 5) == 0)
 221     {
 222       *strp += 5;
 223       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_EPIPHANY_LOW,
 224                                    result_type, valuep);
 225       if (**strp != ')')
 226         return MISSING_CLOSE_PARENTHESIS;
 227       ++*strp;
 228     }
 229   else if (!cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_gr_names,
 230                                 &dummyval)
 231            || !cgen_parse_keyword (cd, strp, &epiphany_cgen_opval_cr_names,
 232                                    &dummyval))
 233     /* Don't treat "mov ip,ip" as a move-immediate.  */
 234     return _("register source in immediate move");
 235   else
 236     errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_16,
 237                                  result_type, valuep);
 238
 239   if (!errmsg && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 240     errmsg = cgen_validate_unsigned_integer (*valuep, 0, 0xffff);
 241
 242   *valuep &= 0xffff;
 243   return errmsg;
 244 }
 245
 246 const char *
 247 parse_branch_addr (CGEN_CPU_DESC cd,
 248                    const char ** strp,
 249                    int opindex,
 250                    int opinfo ATTRIBUTE_UNUSED,
 251                    enum cgen_parse_operand_result * resultp ATTRIBUTE_UNUSED,
 252                    bfd_vma *valuep ATTRIBUTE_UNUSED)
 253 {
 254   const char * errmsg;
 255   enum cgen_parse_operand_result result_type;
 256   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 257   bfd_vma value;
 258
 259   switch (opindex)
 260     {
 261     case EPIPHANY_OPERAND_SIMM24:
 262       code = BFD_RELOC_EPIPHANY_SIMM24;
 263       break;
 264
 265     case EPIPHANY_OPERAND_SIMM8:
 266       code = BFD_RELOC_EPIPHANY_SIMM8;
 267       break;
 268
 269     default:
 270       errmsg = _("ABORT: unknown operand");
 271       return errmsg;
 272     }
 273
 274   errmsg = cgen_parse_address (cd, strp, opindex, code,
 275                                &result_type, &value);
 276   if (errmsg == NULL)
 277     {
 278       if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 279         {
 280           /* Act as if we had done a PC-relative branch, ala .+num.  */
 281           char buf[20];
 282           const char * bufp = (const char *) buf;
 283
 284           sprintf (buf, ".+%ld", (long) value);
 285           errmsg = cgen_parse_address (cd, &bufp, opindex, code, &result_type,
 286                                        &value);
 287         }
 288
 289       if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED)
 290         {
 291           /* This will happen for things like (s2-s1) where s2 and s1
 292              are labels.  */
 293           /* Nothing further to be done.  */
 294         }
 295       else
 296         errmsg = _("Not a pc-relative address.");
 297     }
 298   return errmsg;
 299 }
 300 \f
 301 /* -- dis.c */
 302
 303 const char * epiphany_cgen_parse_operand
 304   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 305
 306 /* Main entry point for operand parsing.
 307
 308    This function is basically just a big switch statement.  Earlier versions
 309    used tables to look up the function to use, but
 310    - if the table contains both assembler and disassembler functions then
 311      the disassembler contains much of the assembler and vice-versa,
 312    - there's a lot of inlining possibilities as things grow,
 313    - using a switch statement avoids the function call overhead.
 314
 315    This function could be moved into `parse_insn_normal', but keeping it
 316    separate makes clear the interface between `parse_insn_normal' and each of
 317    the handlers.  */
 318
 319 const char *
 320 epiphany_cgen_parse_operand (CGEN_CPU_DESC cd,
 321                            int opindex,
 322                            const char ** strp,
 323                            CGEN_FIELDS * fields)
 324 {
 325   const char * errmsg = NULL;
 326   /* Used by scalar operands that still need to be parsed.  */
 327   long junk ATTRIBUTE_UNUSED;
 328
 329   switch (opindex)
 330     {
 331     case EPIPHANY_OPERAND_DIRECTION :
 332       errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DIRECTION, (unsigned long *) (& fields->f_addsubx));
 333       break;
 334     case EPIPHANY_OPERAND_DISP11 :
 335       errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_DISP11, (unsigned long *) (& fields->f_disp11));
 336       break;
 337     case EPIPHANY_OPERAND_DISP3 :
 338       errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_DISP3, (unsigned long *) (& fields->f_disp3));
 339       break;
 340     case EPIPHANY_OPERAND_DPMI :
 341       errmsg = parse_postindex (cd, strp, EPIPHANY_OPERAND_DPMI, (unsigned long *) (& fields->f_subd));
 342       break;
 343     case EPIPHANY_OPERAND_FRD :
 344       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd);
 345       break;
 346     case EPIPHANY_OPERAND_FRD6 :
 347       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6);
 348       break;
 349     case EPIPHANY_OPERAND_FRM :
 350       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm);
 351       break;
 352     case EPIPHANY_OPERAND_FRM6 :
 353       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6);
 354       break;
 355     case EPIPHANY_OPERAND_FRN :
 356       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn);
 357       break;
 358     case EPIPHANY_OPERAND_FRN6 :
 359       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6);
 360       break;
 361     case EPIPHANY_OPERAND_IMM16 :
 362       {
 363         bfd_vma value = 0;
 364         errmsg = parse_imm16 (cd, strp, EPIPHANY_OPERAND_IMM16, 0, NULL,  & value);
 365         fields->f_imm16 = value;
 366       }
 367       break;
 368     case EPIPHANY_OPERAND_IMM8 :
 369       {
 370         bfd_vma value = 0;
 371         errmsg = parse_imm8 (cd, strp, EPIPHANY_OPERAND_IMM8, 0, NULL,  & value);
 372         fields->f_imm8 = value;
 373       }
 374       break;
 375     case EPIPHANY_OPERAND_RD :
 376       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd);
 377       break;
 378     case EPIPHANY_OPERAND_RD6 :
 379       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rd6);
 380       break;
 381     case EPIPHANY_OPERAND_RM :
 382       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm);
 383       break;
 384     case EPIPHANY_OPERAND_RM6 :
 385       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rm6);
 386       break;
 387     case EPIPHANY_OPERAND_RN :
 388       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn);
 389       break;
 390     case EPIPHANY_OPERAND_RN6 :
 391       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_gr_names, & fields->f_rn6);
 392       break;
 393     case EPIPHANY_OPERAND_SD :
 394       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd);
 395       break;
 396     case EPIPHANY_OPERAND_SD6 :
 397       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sd6);
 398       break;
 399     case EPIPHANY_OPERAND_SDDMA :
 400       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sd6);
 401       break;
 402     case EPIPHANY_OPERAND_SDMEM :
 403       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sd6);
 404       break;
 405     case EPIPHANY_OPERAND_SDMESH :
 406       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sd6);
 407       break;
 408     case EPIPHANY_OPERAND_SHIFT :
 409       errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_SHIFT, (unsigned long *) (& fields->f_shift));
 410       break;
 411     case EPIPHANY_OPERAND_SIMM11 :
 412       errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM11, (long *) (& fields->f_sdisp11));
 413       break;
 414     case EPIPHANY_OPERAND_SIMM24 :
 415       {
 416         bfd_vma value = 0;
 417         errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM24, 0, NULL,  & value);
 418         fields->f_simm24 = value;
 419       }
 420       break;
 421     case EPIPHANY_OPERAND_SIMM3 :
 422       errmsg = parse_simm_not_reg (cd, strp, EPIPHANY_OPERAND_SIMM3, (long *) (& fields->f_sdisp3));
 423       break;
 424     case EPIPHANY_OPERAND_SIMM8 :
 425       {
 426         bfd_vma value = 0;
 427         errmsg = parse_branch_addr (cd, strp, EPIPHANY_OPERAND_SIMM8, 0, NULL,  & value);
 428         fields->f_simm8 = value;
 429       }
 430       break;
 431     case EPIPHANY_OPERAND_SN :
 432       errmsg = parse_shortregs (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn);
 433       break;
 434     case EPIPHANY_OPERAND_SN6 :
 435       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_cr_names, & fields->f_sn6);
 436       break;
 437     case EPIPHANY_OPERAND_SNDMA :
 438       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crdma_names, & fields->f_sn6);
 439       break;
 440     case EPIPHANY_OPERAND_SNMEM :
 441       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmem_names, & fields->f_sn6);
 442       break;
 443     case EPIPHANY_OPERAND_SNMESH :
 444       errmsg = cgen_parse_keyword (cd, strp, & epiphany_cgen_opval_crmesh_names, & fields->f_sn6);
 445       break;
 446     case EPIPHANY_OPERAND_SWI_NUM :
 447       errmsg = parse_uimm_not_reg (cd, strp, EPIPHANY_OPERAND_SWI_NUM, (unsigned long *) (& fields->f_trap_num));
 448       break;
 449     case EPIPHANY_OPERAND_TRAPNUM6 :
 450       errmsg = cgen_parse_unsigned_integer (cd, strp, EPIPHANY_OPERAND_TRAPNUM6, (unsigned long *) (& fields->f_trap_num));
 451       break;
 452
 453     default :
 454       /* xgettext:c-format */
 455       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 456       abort ();
 457   }
 458
 459   return errmsg;
 460 }
 461
 462 cgen_parse_fn * const epiphany_cgen_parse_handlers[] =
 463 {
 464   parse_insn_normal,
 465 };
 466
 467 void
 468 epiphany_cgen_init_asm (CGEN_CPU_DESC cd)
 469 {
 470   epiphany_cgen_init_opcode_table (cd);
 471   epiphany_cgen_init_ibld_table (cd);
 472   cd->parse_handlers = & epiphany_cgen_parse_handlers[0];
 473   cd->parse_operand = epiphany_cgen_parse_operand;
 474 #ifdef CGEN_ASM_INIT_HOOK
 475 CGEN_ASM_INIT_HOOK
 476 #endif
 477 }
 478
 479 \f
 480
 481 /* Regex construction routine.
 482
 483    This translates an opcode syntax string into a regex string,
 484    by replacing any non-character syntax element (such as an
 485    opcode) with the pattern '.*'
 486
 487    It then compiles the regex and stores it in the opcode, for
 488    later use by epiphany_cgen_assemble_insn
 489
 490    Returns NULL for success, an error message for failure.  */
 491
 492 char *
 493 epiphany_cgen_build_insn_regex (CGEN_INSN *insn)
 494 {
 495   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 496   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 497   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 498   char *rx = rxbuf;
 499   const CGEN_SYNTAX_CHAR_TYPE *syn;
 500   int reg_err;
 501
 502   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 503
 504   /* Mnemonics come first in the syntax string.  */
 505   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 506     return _("missing mnemonic in syntax string");
 507   ++syn;
 508
 509   /* Generate a case sensitive regular expression that emulates case
 510      insensitive matching in the "C" locale.  We cannot generate a case
 511      insensitive regular expression because in Turkish locales, 'i' and 'I'
 512      are not equal modulo case conversion.  */
 513
 514   /* Copy the literal mnemonic out of the insn.  */
 515   for (; *mnem; mnem++)
 516     {
 517       char c = *mnem;
 518
 519       if (ISALPHA (c))
 520         {
 521           *rx++ = '[';
 522           *rx++ = TOLOWER (c);
 523           *rx++ = TOUPPER (c);
 524           *rx++ = ']';
 525         }
 526       else
 527         *rx++ = c;
 528     }
 529
 530   /* Copy any remaining literals from the syntax string into the rx.  */
 531   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 532     {
 533       if (CGEN_SYNTAX_CHAR_P (* syn))
 534         {
 535           char c = CGEN_SYNTAX_CHAR (* syn);
 536
 537           switch (c)
 538             {
 539               /* Escape any regex metacharacters in the syntax.  */
 540             case '.': case '[': case '\\':
 541             case '*': case '^': case '$':
 542
 543 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 544             case '?': case '{': case '}':
 545             case '(': case ')': case '*':
 546             case '|': case '+': case ']':
 547 #endif
 548               *rx++ = '\\';
 549               *rx++ = c;
 550               break;
 551
 552             default:
 553               if (ISALPHA (c))
 554                 {
 555                   *rx++ = '[';
 556                   *rx++ = TOLOWER (c);
 557                   *rx++ = TOUPPER (c);
 558                   *rx++ = ']';
 559                 }
 560               else
 561                 *rx++ = c;
 562               break;
 563             }
 564         }
 565       else
 566         {
 567           /* Replace non-syntax fields with globs.  */
 568           *rx++ = '.';
 569           *rx++ = '*';
 570         }
 571     }
 572
 573   /* Trailing whitespace ok.  */
 574   * rx++ = '[';
 575   * rx++ = ' ';
 576   * rx++ = '\t';
 577   * rx++ = ']';
 578   * rx++ = '*';
 579
 580   /* But anchor it after that.  */
 581   * rx++ = '$';
 582   * rx = '\0';
 583
 584   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 585   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 586
 587   if (reg_err == 0)
 588     return NULL;
 589   else
 590     {
 591       static char msg[80];
 592
 593       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 594       regfree ((regex_t *) CGEN_INSN_RX (insn));
 595       free (CGEN_INSN_RX (insn));
 596       (CGEN_INSN_RX (insn)) = NULL;
 597       return msg;
 598     }
 599 }
 600
 601 \f
 602 /* Default insn parser.
 603
 604    The syntax string is scanned and operands are parsed and stored in FIELDS.
 605    Relocs are queued as we go via other callbacks.
 606
 607    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 608    parse the instruction, we return 0 and the caller will start over from
 609    the beginning.  Backtracking will be necessary in parsing subexpressions,
 610    but that can be handled there.  Not handling backtracking here may get
 611    expensive in the case of the m68k.  Deal with later.
 612
 613    Returns NULL for success, an error message for failure.  */
 614
 615 static const char *
 616 parse_insn_normal (CGEN_CPU_DESC cd,
 617                    const CGEN_INSN *insn,
 618                    const char **strp,
 619                    CGEN_FIELDS *fields)
 620 {
 621   /* ??? Runtime added insns not handled yet.  */
 622   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 623   const char *str = *strp;
 624   const char *errmsg;
 625   const char *p;
 626   const CGEN_SYNTAX_CHAR_TYPE * syn;
 627 #ifdef CGEN_MNEMONIC_OPERANDS
 628   /* FIXME: wip */
 629   int past_opcode_p;
 630 #endif
 631
 632   /* For now we assume the mnemonic is first (there are no leading operands).
 633      We can parse it without needing to set up operand parsing.
 634      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 635      not be called from GAS.  */
 636   p = CGEN_INSN_MNEMONIC (insn);
 637   while (*p && TOLOWER (*p) == TOLOWER (*str))
 638     ++p, ++str;
 639
 640   if (* p)
 641     return _("unrecognized instruction");
 642
 643 #ifndef CGEN_MNEMONIC_OPERANDS
 644   if (* str && ! ISSPACE (* str))
 645     return _("unrecognized instruction");
 646 #endif
 647
 648   CGEN_INIT_PARSE (cd);
 649   cgen_init_parse_operand (cd);
 650 #ifdef CGEN_MNEMONIC_OPERANDS
 651   past_opcode_p = 0;
 652 #endif
 653
 654   /* We don't check for (*str != '\0') here because we want to parse
 655      any trailing fake arguments in the syntax string.  */
 656   syn = CGEN_SYNTAX_STRING (syntax);
 657
 658   /* Mnemonics come first for now, ensure valid string.  */
 659   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 660     abort ();
 661
 662   ++syn;
 663
 664   while (* syn != 0)
 665     {
 666       /* Non operand chars must match exactly.  */
 667       if (CGEN_SYNTAX_CHAR_P (* syn))
 668         {
 669           /* FIXME: While we allow for non-GAS callers above, we assume the
 670              first char after the mnemonic part is a space.  */
 671           /* FIXME: We also take inappropriate advantage of the fact that
 672              GAS's input scrubber will remove extraneous blanks.  */
 673           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 674             {
 675 #ifdef CGEN_MNEMONIC_OPERANDS
 676               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 677                 past_opcode_p = 1;
 678 #endif
 679               ++ syn;
 680               ++ str;
 681             }
 682           else if (*str)
 683             {
 684               /* Syntax char didn't match.  Can't be this insn.  */
 685               static char msg [80];
 686
 687               /* xgettext:c-format */
 688               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 689                        CGEN_SYNTAX_CHAR(*syn), *str);
 690               return msg;
 691             }
 692           else
 693             {
 694               /* Ran out of input.  */
 695               static char msg [80];
 696
 697               /* xgettext:c-format */
 698               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 699                        CGEN_SYNTAX_CHAR(*syn));
 700               return msg;
 701             }
 702           continue;
 703         }
 704
 705 #ifdef CGEN_MNEMONIC_OPERANDS
 706       (void) past_opcode_p;
 707 #endif
 708       /* We have an operand of some sort.  */
 709       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 710       if (errmsg)
 711         return errmsg;
 712
 713       /* Done with this operand, continue with next one.  */
 714       ++ syn;
 715     }
 716
 717   /* If we're at the end of the syntax string, we're done.  */
 718   if (* syn == 0)
 719     {
 720       /* FIXME: For the moment we assume a valid `str' can only contain
 721          blanks now.  IE: We needn't try again with a longer version of
 722          the insn and it is assumed that longer versions of insns appear
 723          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 724       while (ISSPACE (* str))
 725         ++ str;
 726
 727       if (* str != '\0')
 728         return _("junk at end of line"); /* FIXME: would like to include `str' */
 729
 730       return NULL;
 731     }
 732
 733   /* We couldn't parse it.  */
 734   return _("unrecognized instruction");
 735 }
 736 \f
 737 /* Main entry point.
 738    This routine is called for each instruction to be assembled.
 739    STR points to the insn to be assembled.
 740    We assume all necessary tables have been initialized.
 741    The assembled instruction, less any fixups, is stored in BUF.
 742    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 743    still needs to be converted to target byte order, otherwise BUF is an array
 744    of bytes in target byte order.
 745    The result is a pointer to the insn's entry in the opcode table,
 746    or NULL if an error occured (an error message will have already been
 747    printed).
 748
 749    Note that when processing (non-alias) macro-insns,
 750    this function recurses.
 751
 752    ??? It's possible to make this cpu-independent.
 753    One would have to deal with a few minor things.
 754    At this point in time doing so would be more of a curiosity than useful
 755    [for example this file isn't _that_ big], but keeping the possibility in
 756    mind helps keep the design clean.  */
 757
 758 const CGEN_INSN *
 759 epiphany_cgen_assemble_insn (CGEN_CPU_DESC cd,
 760                            const char *str,
 761                            CGEN_FIELDS *fields,
 762                            CGEN_INSN_BYTES_PTR buf,
 763                            char **errmsg)
 764 {
 765   const char *start;
 766   CGEN_INSN_LIST *ilist;
 767   const char *parse_errmsg = NULL;
 768   const char *insert_errmsg = NULL;
 769   int recognized_mnemonic = 0;
 770
 771   /* Skip leading white space.  */
 772   while (ISSPACE (* str))
 773     ++ str;
 774
 775   /* The instructions are stored in hashed lists.
 776      Get the first in the list.  */
 777   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 778
 779   /* Keep looking until we find a match.  */
 780   start = str;
 781   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 782     {
 783       const CGEN_INSN *insn = ilist->insn;
 784       recognized_mnemonic = 1;
 785
 786 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 787       /* Not usually needed as unsupported opcodes
 788          shouldn't be in the hash lists.  */
 789       /* Is this insn supported by the selected cpu?  */
 790       if (! epiphany_cgen_insn_supported (cd, insn))
 791         continue;
 792 #endif
 793       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 794          chosen immediately.  Instead, it is used during assembler/linker
 795          relaxation if possible.  */
 796       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 797         continue;
 798
 799       str = start;
 800
 801       /* Skip this insn if str doesn't look right lexically.  */
 802       if (CGEN_INSN_RX (insn) != NULL &&
 803           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 804         continue;
 805
 806       /* Allow parse/insert handlers to obtain length of insn.  */
 807       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 808
 809       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 810       if (parse_errmsg != NULL)
 811         continue;
 812
 813       /* ??? 0 is passed for `pc'.  */
 814       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 815                                                  (bfd_vma) 0);
 816       if (insert_errmsg != NULL)
 817         continue;
 818
 819       /* It is up to the caller to actually output the insn and any
 820          queued relocs.  */
 821       return insn;
 822     }
 823
 824   {
 825     static char errbuf[150];
 826     const char *tmp_errmsg;
 827 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 828 #define be_verbose 1
 829 #else
 830 #define be_verbose 0
 831 #endif
 832
 833     if (be_verbose)
 834       {
 835         /* If requesting verbose error messages, use insert_errmsg.
 836            Failing that, use parse_errmsg.  */
 837         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 838                       parse_errmsg ? parse_errmsg :
 839                       recognized_mnemonic ?
 840                       _("unrecognized form of instruction") :
 841                       _("unrecognized instruction"));
 842
 843         if (strlen (start) > 50)
 844           /* xgettext:c-format */
 845           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 846         else
 847           /* xgettext:c-format */
 848           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 849       }
 850     else
 851       {
 852         if (strlen (start) > 50)
 853           /* xgettext:c-format */
 854           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 855         else
 856           /* xgettext:c-format */
 857           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 858       }
 859
 860     *errmsg = errbuf;
 861     return NULL;
 862   }
 863 }