opcodes/epiphany-asm.c

   1 /* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
   2 /* Assembler interface for targets using CGEN. -*- C -*-
   3    CGEN: Cpu tools GENerator
   4
   5    THIS FILE IS MACHINE GENERATED WITH CGEN.
   6    - the resultant file is machine generated, cgen-asm.in isn't
   7
   8    Copyright (C) 1996-2024 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       opcodes_error_handler
 456         (_("internal error: unrecognized field %d while parsing"),
 457          opindex);
 458       abort ();
 459   }
 460
 461   return errmsg;
 462 }
 463
 464 cgen_parse_fn * const epiphany_cgen_parse_handlers[] =
 465 {
 466   parse_insn_normal,
 467 };
 468
 469 void
 470 epiphany_cgen_init_asm (CGEN_CPU_DESC cd)
 471 {
 472   epiphany_cgen_init_opcode_table (cd);
 473   epiphany_cgen_init_ibld_table (cd);
 474   cd->parse_handlers = & epiphany_cgen_parse_handlers[0];
 475   cd->parse_operand = epiphany_cgen_parse_operand;
 476 #ifdef CGEN_ASM_INIT_HOOK
 477 CGEN_ASM_INIT_HOOK
 478 #endif
 479 }
 480
 481 \f
 482
 483 /* Regex construction routine.
 484
 485    This translates an opcode syntax string into a regex string,
 486    by replacing any non-character syntax element (such as an
 487    opcode) with the pattern '.*'
 488
 489    It then compiles the regex and stores it in the opcode, for
 490    later use by epiphany_cgen_assemble_insn
 491
 492    Returns NULL for success, an error message for failure.  */
 493
 494 char *
 495 epiphany_cgen_build_insn_regex (CGEN_INSN *insn)
 496 {
 497   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 498   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 499   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 500   char *rx = rxbuf;
 501   const CGEN_SYNTAX_CHAR_TYPE *syn;
 502   int reg_err;
 503
 504   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 505
 506   /* Mnemonics come first in the syntax string.  */
 507   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 508     return _("missing mnemonic in syntax string");
 509   ++syn;
 510
 511   /* Generate a case sensitive regular expression that emulates case
 512      insensitive matching in the "C" locale.  We cannot generate a case
 513      insensitive regular expression because in Turkish locales, 'i' and 'I'
 514      are not equal modulo case conversion.  */
 515
 516   /* Copy the literal mnemonic out of the insn.  */
 517   for (; *mnem; mnem++)
 518     {
 519       char c = *mnem;
 520
 521       if (ISALPHA (c))
 522         {
 523           *rx++ = '[';
 524           *rx++ = TOLOWER (c);
 525           *rx++ = TOUPPER (c);
 526           *rx++ = ']';
 527         }
 528       else
 529         *rx++ = c;
 530     }
 531
 532   /* Copy any remaining literals from the syntax string into the rx.  */
 533   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 534     {
 535       if (CGEN_SYNTAX_CHAR_P (* syn))
 536         {
 537           char c = CGEN_SYNTAX_CHAR (* syn);
 538
 539           switch (c)
 540             {
 541               /* Escape any regex metacharacters in the syntax.  */
 542             case '.': case '[': case '\\':
 543             case '*': case '^': case '$':
 544
 545 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 546             case '?': case '{': case '}':
 547             case '(': case ')': case '*':
 548             case '|': case '+': case ']':
 549 #endif
 550               *rx++ = '\\';
 551               *rx++ = c;
 552               break;
 553
 554             default:
 555               if (ISALPHA (c))
 556                 {
 557                   *rx++ = '[';
 558                   *rx++ = TOLOWER (c);
 559                   *rx++ = TOUPPER (c);
 560                   *rx++ = ']';
 561                 }
 562               else
 563                 *rx++ = c;
 564               break;
 565             }
 566         }
 567       else
 568         {
 569           /* Replace non-syntax fields with globs.  */
 570           *rx++ = '.';
 571           *rx++ = '*';
 572         }
 573     }
 574
 575   /* Trailing whitespace ok.  */
 576   * rx++ = '[';
 577   * rx++ = ' ';
 578   * rx++ = '\t';
 579   * rx++ = ']';
 580   * rx++ = '*';
 581
 582   /* But anchor it after that.  */
 583   * rx++ = '$';
 584   * rx = '\0';
 585
 586   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 587   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 588
 589   if (reg_err == 0)
 590     return NULL;
 591   else
 592     {
 593       static char msg[80];
 594
 595       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 596       regfree ((regex_t *) CGEN_INSN_RX (insn));
 597       free (CGEN_INSN_RX (insn));
 598       (CGEN_INSN_RX (insn)) = NULL;
 599       return msg;
 600     }
 601 }
 602
 603 \f
 604 /* Default insn parser.
 605
 606    The syntax string is scanned and operands are parsed and stored in FIELDS.
 607    Relocs are queued as we go via other callbacks.
 608
 609    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 610    parse the instruction, we return 0 and the caller will start over from
 611    the beginning.  Backtracking will be necessary in parsing subexpressions,
 612    but that can be handled there.  Not handling backtracking here may get
 613    expensive in the case of the m68k.  Deal with later.
 614
 615    Returns NULL for success, an error message for failure.  */
 616
 617 static const char *
 618 parse_insn_normal (CGEN_CPU_DESC cd,
 619                    const CGEN_INSN *insn,
 620                    const char **strp,
 621                    CGEN_FIELDS *fields)
 622 {
 623   /* ??? Runtime added insns not handled yet.  */
 624   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 625   const char *str = *strp;
 626   const char *errmsg;
 627   const char *p;
 628   const CGEN_SYNTAX_CHAR_TYPE * syn;
 629 #ifdef CGEN_MNEMONIC_OPERANDS
 630   /* FIXME: wip */
 631   int past_opcode_p;
 632 #endif
 633
 634   /* For now we assume the mnemonic is first (there are no leading operands).
 635      We can parse it without needing to set up operand parsing.
 636      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 637      not be called from GAS.  */
 638   p = CGEN_INSN_MNEMONIC (insn);
 639   while (*p && TOLOWER (*p) == TOLOWER (*str))
 640     ++p, ++str;
 641
 642   if (* p)
 643     return _("unrecognized instruction");
 644
 645 #ifndef CGEN_MNEMONIC_OPERANDS
 646   if (* str && ! ISSPACE (* str))
 647     return _("unrecognized instruction");
 648 #endif
 649
 650   CGEN_INIT_PARSE (cd);
 651   cgen_init_parse_operand (cd);
 652 #ifdef CGEN_MNEMONIC_OPERANDS
 653   past_opcode_p = 0;
 654 #endif
 655
 656   /* We don't check for (*str != '\0') here because we want to parse
 657      any trailing fake arguments in the syntax string.  */
 658   syn = CGEN_SYNTAX_STRING (syntax);
 659
 660   /* Mnemonics come first for now, ensure valid string.  */
 661   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 662     abort ();
 663
 664   ++syn;
 665
 666   while (* syn != 0)
 667     {
 668       /* Non operand chars must match exactly.  */
 669       if (CGEN_SYNTAX_CHAR_P (* syn))
 670         {
 671           /* FIXME: While we allow for non-GAS callers above, we assume the
 672              first char after the mnemonic part is a space.  */
 673           /* FIXME: We also take inappropriate advantage of the fact that
 674              GAS's input scrubber will remove extraneous blanks.  */
 675           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 676             {
 677 #ifdef CGEN_MNEMONIC_OPERANDS
 678               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 679                 past_opcode_p = 1;
 680 #endif
 681               ++ syn;
 682               ++ str;
 683             }
 684           else if (*str)
 685             {
 686               /* Syntax char didn't match.  Can't be this insn.  */
 687               static char msg [80];
 688
 689               /* xgettext:c-format */
 690               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 691                        CGEN_SYNTAX_CHAR(*syn), *str);
 692               return msg;
 693             }
 694           else
 695             {
 696               /* Ran out of input.  */
 697               static char msg [80];
 698
 699               /* xgettext:c-format */
 700               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 701                        CGEN_SYNTAX_CHAR(*syn));
 702               return msg;
 703             }
 704           continue;
 705         }
 706
 707 #ifdef CGEN_MNEMONIC_OPERANDS
 708       (void) past_opcode_p;
 709 #endif
 710       /* We have an operand of some sort.  */
 711       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 712       if (errmsg)
 713         return errmsg;
 714
 715       /* Done with this operand, continue with next one.  */
 716       ++ syn;
 717     }
 718
 719   /* If we're at the end of the syntax string, we're done.  */
 720   if (* syn == 0)
 721     {
 722       /* FIXME: For the moment we assume a valid `str' can only contain
 723          blanks now.  IE: We needn't try again with a longer version of
 724          the insn and it is assumed that longer versions of insns appear
 725          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 726       while (ISSPACE (* str))
 727         ++ str;
 728
 729       if (* str != '\0')
 730         return _("junk at end of line"); /* FIXME: would like to include `str' */
 731
 732       return NULL;
 733     }
 734
 735   /* We couldn't parse it.  */
 736   return _("unrecognized instruction");
 737 }
 738 \f
 739 /* Main entry point.
 740    This routine is called for each instruction to be assembled.
 741    STR points to the insn to be assembled.
 742    We assume all necessary tables have been initialized.
 743    The assembled instruction, less any fixups, is stored in BUF.
 744    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 745    still needs to be converted to target byte order, otherwise BUF is an array
 746    of bytes in target byte order.
 747    The result is a pointer to the insn's entry in the opcode table,
 748    or NULL if an error occured (an error message will have already been
 749    printed).
 750
 751    Note that when processing (non-alias) macro-insns,
 752    this function recurses.
 753
 754    ??? It's possible to make this cpu-independent.
 755    One would have to deal with a few minor things.
 756    At this point in time doing so would be more of a curiosity than useful
 757    [for example this file isn't _that_ big], but keeping the possibility in
 758    mind helps keep the design clean.  */
 759
 760 const CGEN_INSN *
 761 epiphany_cgen_assemble_insn (CGEN_CPU_DESC cd,
 762                            const char *str,
 763                            CGEN_FIELDS *fields,
 764                            CGEN_INSN_BYTES_PTR buf,
 765                            char **errmsg)
 766 {
 767   const char *start;
 768   CGEN_INSN_LIST *ilist;
 769   const char *parse_errmsg = NULL;
 770   const char *insert_errmsg = NULL;
 771   int recognized_mnemonic = 0;
 772
 773   /* Skip leading white space.  */
 774   while (ISSPACE (* str))
 775     ++ str;
 776
 777   /* The instructions are stored in hashed lists.
 778      Get the first in the list.  */
 779   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 780
 781   /* Keep looking until we find a match.  */
 782   start = str;
 783   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 784     {
 785       const CGEN_INSN *insn = ilist->insn;
 786       recognized_mnemonic = 1;
 787
 788 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 789       /* Not usually needed as unsupported opcodes
 790          shouldn't be in the hash lists.  */
 791       /* Is this insn supported by the selected cpu?  */
 792       if (! epiphany_cgen_insn_supported (cd, insn))
 793         continue;
 794 #endif
 795       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 796          chosen immediately.  Instead, it is used during assembler/linker
 797          relaxation if possible.  */
 798       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 799         continue;
 800
 801       str = start;
 802
 803       /* Skip this insn if str doesn't look right lexically.  */
 804       if (CGEN_INSN_RX (insn) != NULL &&
 805           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 806         continue;
 807
 808       /* Allow parse/insert handlers to obtain length of insn.  */
 809       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 810
 811       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 812       if (parse_errmsg != NULL)
 813         continue;
 814
 815       /* ??? 0 is passed for `pc'.  */
 816       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 817                                                  (bfd_vma) 0);
 818       if (insert_errmsg != NULL)
 819         continue;
 820
 821       /* It is up to the caller to actually output the insn and any
 822          queued relocs.  */
 823       return insn;
 824     }
 825
 826   {
 827     static char errbuf[150];
 828     const char *tmp_errmsg;
 829 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 830 #define be_verbose 1
 831 #else
 832 #define be_verbose 0
 833 #endif
 834
 835     if (be_verbose)
 836       {
 837         /* If requesting verbose error messages, use insert_errmsg.
 838            Failing that, use parse_errmsg.  */
 839         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 840                       parse_errmsg ? parse_errmsg :
 841                       recognized_mnemonic ?
 842                       _("unrecognized form of instruction") :
 843                       _("unrecognized instruction"));
 844
 845         if (strlen (start) > 50)
 846           /* xgettext:c-format */
 847           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 848         else
 849           /* xgettext:c-format */
 850           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 851       }
 852     else
 853       {
 854         if (strlen (start) > 50)
 855           /* xgettext:c-format */
 856           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 857         else
 858           /* xgettext:c-format */
 859           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 860       }
 861
 862     *errmsg = errbuf;
 863     return NULL;
 864   }
 865 }