gas/config/tc-mn10200.c

   1 /* tc-mn10200.c -- Assembler code for the Matsushita 10200
   2    Copyright (C) 1996-2022 Free Software Foundation, Inc.
   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 3, 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, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "as.h"
  22 #include "safe-ctype.h"
  23 #include "subsegs.h"
  24 #include "opcode/mn10200.h"
  25 \f
  26 /* Structure to hold information about predefined registers.  */
  27 struct reg_name
  28 {
  29   const char *name;
  30   int value;
  31 };
  32
  33 /* Generic assembler global variables which must be defined by all
  34    targets.  */
  35
  36 /* Characters which always start a comment.  */
  37 const char comment_chars[] = "#";
  38
  39 /* Characters which start a comment at the beginning of a line.  */
  40 const char line_comment_chars[] = ";#";
  41
  42 /* Characters which may be used to separate multiple commands on a
  43    single line.  */
  44 const char line_separator_chars[] = ";";
  45
  46 /* Characters which are used to indicate an exponent in a floating
  47    point number.  */
  48 const char EXP_CHARS[] = "eE";
  49
  50 /* Characters which mean that a number is a floating point constant,
  51    as in 0d1.0.  */
  52 const char FLT_CHARS[] = "dD";
  53 \f
  54 const relax_typeS md_relax_table[] =
  55  {
  56   /* bCC relaxing  */
  57   {0x81, -0x7e, 2, 1},
  58   {0x8004, -0x7ffb, 5, 2},
  59   {0x800006, -0x7ffff9, 7, 0},
  60   /* bCCx relaxing  */
  61   {0x81, -0x7e, 3, 4},
  62   {0x8004, -0x7ffb, 6, 5},
  63   {0x800006, -0x7ffff9, 8, 0},
  64   /* jsr relaxing  */
  65   {0x8004, -0x7ffb, 3, 7},
  66   {0x800006, -0x7ffff9, 5, 0},
  67   /* jmp relaxing  */
  68   {0x81, -0x7e, 2, 9},
  69   {0x8004, -0x7ffb, 3, 10},
  70   {0x800006, -0x7ffff9, 5, 0},
  71
  72 };
  73
  74
  75 /* Fixups.  */
  76 #define MAX_INSN_FIXUPS 5
  77
  78 struct mn10200_fixup
  79 {
  80   expressionS exp;
  81   int opindex;
  82   bfd_reloc_code_real_type reloc;
  83 };
  84
  85 struct mn10200_fixup fixups[MAX_INSN_FIXUPS];
  86 static int fc;
  87 \f
  88 const char *md_shortopts = "";
  89
  90 struct option md_longopts[] =
  91 {
  92   {NULL, no_argument, NULL, 0}
  93 };
  94
  95 size_t md_longopts_size = sizeof (md_longopts);
  96
  97 /* The target specific pseudo-ops which we support.  */
  98 const pseudo_typeS md_pseudo_table[] =
  99 {
 100   { NULL,       NULL,           0 }
 101 };
 102
 103 /* Opcode hash table.  */
 104 static htab_t mn10200_hash;
 105
 106 /* This table is sorted. Suitable for searching by a binary search.  */
 107 static const struct reg_name data_registers[] =
 108 {
 109   { "d0", 0 },
 110   { "d1", 1 },
 111   { "d2", 2 },
 112   { "d3", 3 },
 113 };
 114 #define DATA_REG_NAME_CNT                               \
 115   (sizeof (data_registers) / sizeof (struct reg_name))
 116
 117 static const struct reg_name address_registers[] =
 118 {
 119   { "a0", 0 },
 120   { "a1", 1 },
 121   { "a2", 2 },
 122   { "a3", 3 },
 123 };
 124 #define ADDRESS_REG_NAME_CNT                                    \
 125   (sizeof (address_registers) / sizeof (struct reg_name))
 126
 127 static const struct reg_name other_registers[] =
 128 {
 129   { "mdr", 0 },
 130   { "psw", 0 },
 131 };
 132 #define OTHER_REG_NAME_CNT                              \
 133   (sizeof (other_registers) / sizeof (struct reg_name))
 134
 135 /* reg_name_search does a binary search of the given register table
 136    to see if "name" is a valid register name.  Returns the register
 137    number from the array on success, or -1 on failure.  */
 138
 139 static int
 140 reg_name_search (const struct reg_name *regs,
 141                  int regcount,
 142                  const char *name)
 143 {
 144   int middle, low, high;
 145   int cmp;
 146
 147   low = 0;
 148   high = regcount - 1;
 149
 150   do
 151     {
 152       middle = (low + high) / 2;
 153       cmp = strcasecmp (name, regs[middle].name);
 154       if (cmp < 0)
 155         high = middle - 1;
 156       else if (cmp > 0)
 157         low = middle + 1;
 158       else
 159         return regs[middle].value;
 160     }
 161   while (low <= high);
 162   return -1;
 163 }
 164
 165 /* Summary of register_name().
 166
 167    in: Input_line_pointer points to 1st char of operand.
 168
 169    out: An expressionS.
 170         The operand may have been a register: in this case, X_op == O_register,
 171         X_add_number is set to the register number, and truth is returned.
 172         Input_line_pointer->(next non-blank) char after operand, or is in
 173         its original state.  */
 174
 175 static bool
 176 data_register_name (expressionS *expressionP)
 177 {
 178   int reg_number;
 179   char *name;
 180   char *start;
 181   char c;
 182
 183   /* Find the spelling of the operand.  */
 184   start = input_line_pointer;
 185   c = get_symbol_name (&name);
 186   reg_number = reg_name_search (data_registers, DATA_REG_NAME_CNT, name);
 187
 188   /* Put back the delimiting char.  */
 189   (void) restore_line_pointer (c);
 190
 191   /* Look to see if it's in the register table.  */
 192   if (reg_number >= 0)
 193     {
 194       expressionP->X_op = O_register;
 195       expressionP->X_add_number = reg_number;
 196
 197       /* Make the rest nice.  */
 198       expressionP->X_add_symbol = NULL;
 199       expressionP->X_op_symbol = NULL;
 200
 201       return true;
 202     }
 203
 204   /* Reset the line as if we had not done anything.  */
 205   input_line_pointer = start;
 206   return false;
 207 }
 208
 209 /* Summary of register_name().
 210
 211    in: Input_line_pointer points to 1st char of operand.
 212
 213    out: An expressionS.
 214         The operand may have been a register: in this case, X_op == O_register,
 215         X_add_number is set to the register number, and truth is returned.
 216         Input_line_pointer->(next non-blank) char after operand, or is in
 217         its original state.  */
 218
 219 static bool
 220 address_register_name (expressionS *expressionP)
 221 {
 222   int reg_number;
 223   char *name;
 224   char *start;
 225   char c;
 226
 227   /* Find the spelling of the operand.  */
 228   start = input_line_pointer;
 229   c = get_symbol_name (&name);
 230   reg_number = reg_name_search (address_registers, ADDRESS_REG_NAME_CNT, name);
 231
 232   /* Put back the delimiting char.  */
 233   (void) restore_line_pointer (c);
 234
 235   /* Look to see if it's in the register table.  */
 236   if (reg_number >= 0)
 237     {
 238       expressionP->X_op = O_register;
 239       expressionP->X_add_number = reg_number;
 240
 241       /* Make the rest nice.  */
 242       expressionP->X_add_symbol = NULL;
 243       expressionP->X_op_symbol = NULL;
 244
 245       return true;
 246     }
 247
 248   /* Reset the line as if we had not done anything.  */
 249   input_line_pointer = start;
 250   return false;
 251 }
 252
 253 /* Summary of register_name().
 254
 255    in: Input_line_pointer points to 1st char of operand.
 256
 257    out: An expressionS.
 258         The operand may have been a register: in this case, X_op == O_register,
 259         X_add_number is set to the register number, and truth is returned.
 260         Input_line_pointer->(next non-blank) char after operand, or is in
 261         its original state.  */
 262
 263 static bool
 264 other_register_name (expressionS *expressionP)
 265 {
 266   int reg_number;
 267   char *name;
 268   char *start;
 269   char c;
 270
 271   /* Find the spelling of the operand.  */
 272   start = input_line_pointer;
 273   c = get_symbol_name (&name);
 274   reg_number = reg_name_search (other_registers, OTHER_REG_NAME_CNT, name);
 275
 276   /* Put back the delimiting char.  */
 277   (void) restore_line_pointer (c);
 278
 279   /* Look to see if it's in the register table.  */
 280   if (reg_number >= 0)
 281     {
 282       expressionP->X_op = O_register;
 283       expressionP->X_add_number = reg_number;
 284
 285       /* Make the rest nice.  */
 286       expressionP->X_add_symbol = NULL;
 287       expressionP->X_op_symbol = NULL;
 288
 289       return true;
 290     }
 291
 292   /* Reset the line as if we had not done anything.  */
 293   input_line_pointer = start;
 294   return false;
 295 }
 296
 297 void
 298 md_show_usage (FILE *stream)
 299 {
 300   fprintf (stream, _("MN10200 options:\n\
 301 none yet\n"));
 302 }
 303
 304 int
 305 md_parse_option (int c ATTRIBUTE_UNUSED,
 306                  const char *arg ATTRIBUTE_UNUSED)
 307 {
 308   return 0;
 309 }
 310
 311 symbolS *
 312 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 313 {
 314   return 0;
 315 }
 316
 317 const char *
 318 md_atof (int type, char *litp, int *sizep)
 319 {
 320   return ieee_md_atof (type, litp, sizep, false);
 321 }
 322
 323 void
 324 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
 325                  asection *sec,
 326                  fragS *fragP)
 327 {
 328   static unsigned long label_count = 0;
 329   char buf[40];
 330
 331   subseg_change (sec, 0);
 332   if (fragP->fr_subtype == 0)
 333     {
 334       fix_new (fragP, fragP->fr_fix + 1, 1, fragP->fr_symbol,
 335                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 336       fragP->fr_var = 0;
 337       fragP->fr_fix += 2;
 338     }
 339   else if (fragP->fr_subtype == 1)
 340     {
 341       /* Reverse the condition of the first branch.  */
 342       int offset = fragP->fr_fix;
 343       int opcode = fragP->fr_literal[offset] & 0xff;
 344
 345       switch (opcode)
 346         {
 347         case 0xe8:
 348           opcode = 0xe9;
 349           break;
 350         case 0xe9:
 351           opcode = 0xe8;
 352           break;
 353         case 0xe0:
 354           opcode = 0xe2;
 355           break;
 356         case 0xe2:
 357           opcode = 0xe0;
 358           break;
 359         case 0xe3:
 360           opcode = 0xe1;
 361           break;
 362         case 0xe1:
 363           opcode = 0xe3;
 364           break;
 365         case 0xe4:
 366           opcode = 0xe6;
 367           break;
 368         case 0xe6:
 369           opcode = 0xe4;
 370           break;
 371         case 0xe7:
 372           opcode = 0xe5;
 373           break;
 374         case 0xe5:
 375           opcode = 0xe7;
 376           break;
 377         default:
 378           abort ();
 379         }
 380       fragP->fr_literal[offset] = opcode;
 381
 382       /* Create a fixup for the reversed conditional branch.  */
 383       sprintf (buf, ".%s_%ld", FAKE_LABEL_NAME, label_count++);
 384       fix_new (fragP, fragP->fr_fix + 1, 1,
 385                symbol_new (buf, sec, fragP->fr_next, 0),
 386                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 387
 388       /* Now create the unconditional branch + fixup to the
 389          final target.  */
 390       fragP->fr_literal[offset + 2] = 0xfc;
 391       fix_new (fragP, fragP->fr_fix + 3, 2, fragP->fr_symbol,
 392                fragP->fr_offset, 1, BFD_RELOC_16_PCREL);
 393       fragP->fr_var = 0;
 394       fragP->fr_fix += 5;
 395     }
 396   else if (fragP->fr_subtype == 2)
 397     {
 398       /* Reverse the condition of the first branch.  */
 399       int offset = fragP->fr_fix;
 400       int opcode = fragP->fr_literal[offset] & 0xff;
 401
 402       switch (opcode)
 403         {
 404         case 0xe8:
 405           opcode = 0xe9;
 406           break;
 407         case 0xe9:
 408           opcode = 0xe8;
 409           break;
 410         case 0xe0:
 411           opcode = 0xe2;
 412           break;
 413         case 0xe2:
 414           opcode = 0xe0;
 415           break;
 416         case 0xe3:
 417           opcode = 0xe1;
 418           break;
 419         case 0xe1:
 420           opcode = 0xe3;
 421           break;
 422         case 0xe4:
 423           opcode = 0xe6;
 424           break;
 425         case 0xe6:
 426           opcode = 0xe4;
 427           break;
 428         case 0xe7:
 429           opcode = 0xe5;
 430           break;
 431         case 0xe5:
 432           opcode = 0xe7;
 433           break;
 434         default:
 435           abort ();
 436         }
 437       fragP->fr_literal[offset] = opcode;
 438
 439       /* Create a fixup for the reversed conditional branch.  */
 440       sprintf (buf, ".%s_%ld", FAKE_LABEL_NAME, label_count++);
 441       fix_new (fragP, fragP->fr_fix + 1, 1,
 442                symbol_new (buf, sec, fragP->fr_next, 0),
 443                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 444
 445       /* Now create the unconditional branch + fixup to the
 446          final target.  */
 447       fragP->fr_literal[offset + 2] = 0xf4;
 448       fragP->fr_literal[offset + 3] = 0xe0;
 449       fix_new (fragP, fragP->fr_fix + 4, 4, fragP->fr_symbol,
 450                fragP->fr_offset, 1, BFD_RELOC_24_PCREL);
 451       fragP->fr_var = 0;
 452       fragP->fr_fix += 7;
 453     }
 454   else if (fragP->fr_subtype == 3)
 455     {
 456       fix_new (fragP, fragP->fr_fix + 2, 1, fragP->fr_symbol,
 457                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 458       fragP->fr_var = 0;
 459       fragP->fr_fix += 3;
 460     }
 461   else if (fragP->fr_subtype == 4)
 462     {
 463       /* Reverse the condition of the first branch.  */
 464       int offset = fragP->fr_fix;
 465       int opcode = fragP->fr_literal[offset + 1] & 0xff;
 466
 467       switch (opcode)
 468         {
 469         case 0xfc:
 470           opcode = 0xfd;
 471           break;
 472         case 0xfd:
 473           opcode = 0xfc;
 474           break;
 475         case 0xfe:
 476           opcode = 0xff;
 477           break;
 478         case 0xff:
 479           opcode = 0xfe;
 480           break;
 481         case 0xe8:
 482           opcode = 0xe9;
 483           break;
 484         case 0xe9:
 485           opcode = 0xe8;
 486           break;
 487         case 0xe0:
 488           opcode = 0xe2;
 489           break;
 490         case 0xe2:
 491           opcode = 0xe0;
 492           break;
 493         case 0xe3:
 494           opcode = 0xe1;
 495           break;
 496         case 0xe1:
 497           opcode = 0xe3;
 498           break;
 499         case 0xe4:
 500           opcode = 0xe6;
 501           break;
 502         case 0xe6:
 503           opcode = 0xe4;
 504           break;
 505         case 0xe7:
 506           opcode = 0xe5;
 507           break;
 508         case 0xe5:
 509           opcode = 0xe7;
 510           break;
 511         case 0xec:
 512           opcode = 0xed;
 513           break;
 514         case 0xed:
 515           opcode = 0xec;
 516           break;
 517         case 0xee:
 518           opcode = 0xef;
 519           break;
 520         case 0xef:
 521           opcode = 0xee;
 522           break;
 523         default:
 524           abort ();
 525         }
 526       fragP->fr_literal[offset + 1] = opcode;
 527
 528       /* Create a fixup for the reversed conditional branch.  */
 529       sprintf (buf, ".%s_%ld", FAKE_LABEL_NAME, label_count++);
 530       fix_new (fragP, fragP->fr_fix + 2, 1,
 531                symbol_new (buf, sec, fragP->fr_next, 0),
 532                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 533
 534       /* Now create the unconditional branch + fixup to the
 535          final target.  */
 536       fragP->fr_literal[offset + 3] = 0xfc;
 537       fix_new (fragP, fragP->fr_fix + 4, 2, fragP->fr_symbol,
 538                fragP->fr_offset, 1, BFD_RELOC_16_PCREL);
 539       fragP->fr_var = 0;
 540       fragP->fr_fix += 6;
 541     }
 542   else if (fragP->fr_subtype == 5)
 543     {
 544       /* Reverse the condition of the first branch.  */
 545       int offset = fragP->fr_fix;
 546       int opcode = fragP->fr_literal[offset + 1] & 0xff;
 547
 548       switch (opcode)
 549         {
 550         case 0xfc:
 551           opcode = 0xfd;
 552           break;
 553         case 0xfd:
 554           opcode = 0xfc;
 555           break;
 556         case 0xfe:
 557           opcode = 0xff;
 558           break;
 559         case 0xff:
 560           opcode = 0xfe;
 561           break;
 562         case 0xe8:
 563           opcode = 0xe9;
 564           break;
 565         case 0xe9:
 566           opcode = 0xe8;
 567           break;
 568         case 0xe0:
 569           opcode = 0xe2;
 570           break;
 571         case 0xe2:
 572           opcode = 0xe0;
 573           break;
 574         case 0xe3:
 575           opcode = 0xe1;
 576           break;
 577         case 0xe1:
 578           opcode = 0xe3;
 579           break;
 580         case 0xe4:
 581           opcode = 0xe6;
 582           break;
 583         case 0xe6:
 584           opcode = 0xe4;
 585           break;
 586         case 0xe7:
 587           opcode = 0xe5;
 588           break;
 589         case 0xe5:
 590           opcode = 0xe7;
 591           break;
 592         case 0xec:
 593           opcode = 0xed;
 594           break;
 595         case 0xed:
 596           opcode = 0xec;
 597           break;
 598         case 0xee:
 599           opcode = 0xef;
 600           break;
 601         case 0xef:
 602           opcode = 0xee;
 603           break;
 604         default:
 605           abort ();
 606         }
 607       fragP->fr_literal[offset + 1] = opcode;
 608
 609       /* Create a fixup for the reversed conditional branch.  */
 610       sprintf (buf, ".%s_%ld", FAKE_LABEL_NAME, label_count++);
 611       fix_new (fragP, fragP->fr_fix + 2, 1,
 612                symbol_new (buf, sec, fragP->fr_next, 0),
 613                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 614
 615       /* Now create the unconditional branch + fixup to the
 616          final target.  */
 617       fragP->fr_literal[offset + 3] = 0xf4;
 618       fragP->fr_literal[offset + 4] = 0xe0;
 619       fix_new (fragP, fragP->fr_fix + 5, 4, fragP->fr_symbol,
 620                fragP->fr_offset, 1, BFD_RELOC_24_PCREL);
 621       fragP->fr_var = 0;
 622       fragP->fr_fix += 8;
 623     }
 624   else if (fragP->fr_subtype == 6)
 625     {
 626       fix_new (fragP, fragP->fr_fix + 1, 2, fragP->fr_symbol,
 627                fragP->fr_offset, 1, BFD_RELOC_16_PCREL);
 628       fragP->fr_var = 0;
 629       fragP->fr_fix += 3;
 630     }
 631   else if (fragP->fr_subtype == 7)
 632     {
 633       int offset = fragP->fr_fix;
 634       fragP->fr_literal[offset] = 0xf4;
 635       fragP->fr_literal[offset + 1] = 0xe1;
 636
 637       fix_new (fragP, fragP->fr_fix + 2, 4, fragP->fr_symbol,
 638                fragP->fr_offset, 1, BFD_RELOC_24_PCREL);
 639       fragP->fr_var = 0;
 640       fragP->fr_fix += 5;
 641     }
 642   else if (fragP->fr_subtype == 8)
 643     {
 644       fragP->fr_literal[fragP->fr_fix] = 0xea;
 645       fix_new (fragP, fragP->fr_fix + 1, 1, fragP->fr_symbol,
 646                fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
 647       fragP->fr_var = 0;
 648       fragP->fr_fix += 2;
 649     }
 650   else if (fragP->fr_subtype == 9)
 651     {
 652       int offset = fragP->fr_fix;
 653       fragP->fr_literal[offset] = 0xfc;
 654
 655       fix_new (fragP, fragP->fr_fix + 1, 4, fragP->fr_symbol,
 656                fragP->fr_offset, 1, BFD_RELOC_16_PCREL);
 657       fragP->fr_var = 0;
 658       fragP->fr_fix += 3;
 659     }
 660   else if (fragP->fr_subtype == 10)
 661     {
 662       int offset = fragP->fr_fix;
 663       fragP->fr_literal[offset] = 0xf4;
 664       fragP->fr_literal[offset + 1] = 0xe0;
 665
 666       fix_new (fragP, fragP->fr_fix + 2, 4, fragP->fr_symbol,
 667                fragP->fr_offset, 1, BFD_RELOC_24_PCREL);
 668       fragP->fr_var = 0;
 669       fragP->fr_fix += 5;
 670     }
 671   else
 672     abort ();
 673 }
 674
 675 valueT
 676 md_section_align (asection *seg, valueT addr)
 677 {
 678   int align = bfd_section_alignment (seg);
 679   return ((addr + (1 << align) - 1) & -(1 << align));
 680 }
 681
 682 void
 683 md_begin (void)
 684 {
 685   const char *prev_name = "";
 686   const struct mn10200_opcode *op;
 687
 688   mn10200_hash = str_htab_create ();
 689
 690   /* Insert unique names into hash table.  The MN10200 instruction set
 691      has many identical opcode names that have different opcodes based
 692      on the operands.  This hash table then provides a quick index to
 693      the first opcode with a particular name in the opcode table.  */
 694
 695   op = mn10200_opcodes;
 696   while (op->name)
 697     {
 698       if (strcmp (prev_name, op->name))
 699         {
 700           prev_name = (char *) op->name;
 701           str_hash_insert (mn10200_hash, op->name, op, 0);
 702         }
 703       op++;
 704     }
 705
 706   /* This is both a simplification (we don't have to write md_apply_fix)
 707      and support for future optimizations (branch shortening and similar
 708      stuff in the linker.  */
 709   linkrelax = 1;
 710 }
 711
 712 static unsigned long
 713 check_operand (unsigned long insn ATTRIBUTE_UNUSED,
 714                const struct mn10200_operand *operand,
 715                offsetT val)
 716 {
 717   /* No need to check 24bit or 32bit operands for a bit.  */
 718   if (operand->bits < 24
 719       && (operand->flags & MN10200_OPERAND_NOCHECK) == 0)
 720     {
 721       long min, max;
 722       offsetT test;
 723
 724       if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
 725         {
 726           max = (1 << (operand->bits - 1)) - 1;
 727           min = - (1 << (operand->bits - 1));
 728         }
 729       else
 730         {
 731           max = (1 << operand->bits) - 1;
 732           min = 0;
 733         }
 734
 735       test = val;
 736
 737       if (test < (offsetT) min || test > (offsetT) max)
 738         return 0;
 739       else
 740         return 1;
 741     }
 742   return 1;
 743 }
 744 /* If while processing a fixup, a reloc really needs to be created
 745    Then it is done here.  */
 746
 747 arelent *
 748 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
 749 {
 750   arelent *reloc;
 751   reloc = XNEW (arelent);
 752
 753   if (fixp->fx_subsy != NULL)
 754     {
 755       if (S_GET_SEGMENT (fixp->fx_addsy) == S_GET_SEGMENT (fixp->fx_subsy)
 756           && S_IS_DEFINED (fixp->fx_subsy))
 757         {
 758           fixp->fx_offset -= S_GET_VALUE (fixp->fx_subsy);
 759           fixp->fx_subsy = NULL;
 760         }
 761       else
 762         /* FIXME: We should try more ways to resolve difference expressions
 763            here.  At least this is better than silently ignoring the
 764            subtrahend.  */
 765         as_bad_subtract (fixp);
 766     }
 767
 768   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
 769   if (reloc->howto == NULL)
 770     {
 771       as_bad_where (fixp->fx_file, fixp->fx_line,
 772                     _("reloc %d not supported by object file format"),
 773                     (int) fixp->fx_r_type);
 774       return NULL;
 775     }
 776   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
 777   reloc->sym_ptr_ptr = XNEW (asymbol *);
 778   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 779   reloc->addend = fixp->fx_offset;
 780   return reloc;
 781 }
 782
 783 int
 784 md_estimate_size_before_relax (fragS *fragp, asection *seg)
 785 {
 786   if (fragp->fr_subtype == 6
 787       && (!S_IS_DEFINED (fragp->fr_symbol)
 788           || seg != S_GET_SEGMENT (fragp->fr_symbol)))
 789     fragp->fr_subtype = 7;
 790   else if (fragp->fr_subtype == 8
 791            && (!S_IS_DEFINED (fragp->fr_symbol)
 792                || seg != S_GET_SEGMENT (fragp->fr_symbol)))
 793     fragp->fr_subtype = 10;
 794
 795   if (fragp->fr_subtype >= sizeof (md_relax_table) / sizeof (md_relax_table[0]))
 796     abort ();
 797
 798   return md_relax_table[fragp->fr_subtype].rlx_length;
 799 }
 800
 801 long
 802 md_pcrel_from (fixS *fixp)
 803 {
 804   return fixp->fx_frag->fr_address;
 805 }
 806
 807 void
 808 md_apply_fix (fixS * fixP, valueT * valP ATTRIBUTE_UNUSED, segT seg ATTRIBUTE_UNUSED)
 809 {
 810   /* We shouldn't ever get here because linkrelax is nonzero.  */
 811   abort ();
 812   fixP->fx_done = 1;
 813 }
 814
 815 /* Insert an operand value into an instruction.  */
 816
 817 static void
 818 mn10200_insert_operand (unsigned long *insnp,
 819                         unsigned long *extensionp,
 820                         const struct mn10200_operand *operand,
 821                         offsetT val,
 822                         char *file,
 823                         unsigned int line,
 824                         unsigned int shift)
 825 {
 826   /* No need to check 24 or 32bit operands for a bit.  */
 827   if (operand->bits < 24
 828       && (operand->flags & MN10200_OPERAND_NOCHECK) == 0)
 829     {
 830       long min, max;
 831       offsetT test;
 832
 833       if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
 834         {
 835           max = (1 << (operand->bits - 1)) - 1;
 836           min = - (1 << (operand->bits - 1));
 837         }
 838       else
 839         {
 840           max = (1 << operand->bits) - 1;
 841           min = 0;
 842         }
 843
 844       test = val;
 845
 846       if (test < (offsetT) min || test > (offsetT) max)
 847         as_warn_value_out_of_range (_("operand"), test, (offsetT) min, (offsetT) max, file, line);
 848     }
 849
 850   if ((operand->flags & MN10200_OPERAND_EXTENDED) == 0)
 851     {
 852       *insnp |= (((long) val & ((1 << operand->bits) - 1))
 853                  << (operand->shift + shift));
 854
 855       if ((operand->flags & MN10200_OPERAND_REPEATED) != 0)
 856         *insnp |= (((long) val & ((1 << operand->bits) - 1))
 857                    << (operand->shift + shift + 2));
 858     }
 859   else
 860     {
 861       *extensionp |= (val >> 16) & 0xff;
 862       *insnp |= val & 0xffff;
 863     }
 864 }
 865
 866 void
 867 md_assemble (char *str)
 868 {
 869   char *s;
 870   struct mn10200_opcode *opcode;
 871   struct mn10200_opcode *next_opcode;
 872   const unsigned char *opindex_ptr;
 873   int next_opindex, relaxable;
 874   unsigned long insn, extension, size = 0;
 875   char *f;
 876   int i;
 877   int match;
 878
 879   /* Get the opcode.  */
 880   for (s = str; *s != '\0' && !ISSPACE (*s); s++)
 881     ;
 882   if (*s != '\0')
 883     *s++ = '\0';
 884
 885   /* Find the first opcode with the proper name.  */
 886   opcode = (struct mn10200_opcode *) str_hash_find (mn10200_hash, str);
 887   if (opcode == NULL)
 888     {
 889       as_bad (_("Unrecognized opcode: `%s'"), str);
 890       return;
 891     }
 892
 893   str = s;
 894   while (ISSPACE (*str))
 895     ++str;
 896
 897   input_line_pointer = str;
 898
 899   for (;;)
 900     {
 901       const char *errmsg = NULL;
 902       int op_idx;
 903       char *hold;
 904       int extra_shift = 0;
 905
 906       relaxable = 0;
 907       fc = 0;
 908       match = 0;
 909       next_opindex = 0;
 910       insn = opcode->opcode;
 911       extension = 0;
 912       for (op_idx = 1, opindex_ptr = opcode->operands;
 913            *opindex_ptr != 0;
 914            opindex_ptr++, op_idx++)
 915         {
 916           const struct mn10200_operand *operand;
 917           expressionS ex;
 918
 919           if (next_opindex == 0)
 920             {
 921               operand = &mn10200_operands[*opindex_ptr];
 922             }
 923           else
 924             {
 925               operand = &mn10200_operands[next_opindex];
 926               next_opindex = 0;
 927             }
 928
 929           errmsg = NULL;
 930
 931           while (*str == ' ' || *str == ',')
 932             ++str;
 933
 934           if (operand->flags & MN10200_OPERAND_RELAX)
 935             relaxable = 1;
 936
 937           /* Gather the operand.  */
 938           hold = input_line_pointer;
 939           input_line_pointer = str;
 940
 941           if (operand->flags & MN10200_OPERAND_PAREN)
 942             {
 943               if (*input_line_pointer != ')' && *input_line_pointer != '(')
 944                 {
 945                   input_line_pointer = hold;
 946                   str = hold;
 947                   goto error;
 948                 }
 949               input_line_pointer++;
 950               goto keep_going;
 951             }
 952           /* See if we can match the operands.  */
 953           else if (operand->flags & MN10200_OPERAND_DREG)
 954             {
 955               if (!data_register_name (&ex))
 956                 {
 957                   input_line_pointer = hold;
 958                   str = hold;
 959                   goto error;
 960                 }
 961             }
 962           else if (operand->flags & MN10200_OPERAND_AREG)
 963             {
 964               if (!address_register_name (&ex))
 965                 {
 966                   input_line_pointer = hold;
 967                   str = hold;
 968                   goto error;
 969                 }
 970             }
 971           else if (operand->flags & MN10200_OPERAND_PSW)
 972             {
 973               char *start;
 974               char c = get_symbol_name (&start);
 975
 976               if (strcmp (start, "psw") != 0)
 977                 {
 978                   (void) restore_line_pointer (c);
 979                   input_line_pointer = hold;
 980                   str = hold;
 981                   goto error;
 982                 }
 983               (void) restore_line_pointer (c);
 984               goto keep_going;
 985             }
 986           else if (operand->flags & MN10200_OPERAND_MDR)
 987             {
 988               char *start;
 989               char c = get_symbol_name (&start);
 990
 991               if (strcmp (start, "mdr") != 0)
 992                 {
 993                   (void) restore_line_pointer (c);
 994                   input_line_pointer = hold;
 995                   str = hold;
 996                   goto error;
 997                 }
 998               (void) restore_line_pointer (c);
 999               goto keep_going;
1000             }
1001           else if (data_register_name (&ex))
1002             {
1003               input_line_pointer = hold;
1004               str = hold;
1005               goto error;
1006             }
1007           else if (address_register_name (&ex))
1008             {
1009               input_line_pointer = hold;
1010               str = hold;
1011               goto error;
1012             }
1013           else if (other_register_name (&ex))
1014             {
1015               input_line_pointer = hold;
1016               str = hold;
1017               goto error;
1018             }
1019           else if (*str == ')' || *str == '(')
1020             {
1021               input_line_pointer = hold;
1022               str = hold;
1023               goto error;
1024             }
1025           else
1026             {
1027               expression (&ex);
1028             }
1029
1030           switch (ex.X_op)
1031             {
1032             case O_illegal:
1033               errmsg = _("illegal operand");
1034               goto error;
1035             case O_absent:
1036               errmsg = _("missing operand");
1037               goto error;
1038             case O_register:
1039               if ((operand->flags
1040                    & (MN10200_OPERAND_DREG | MN10200_OPERAND_AREG)) == 0)
1041                 {
1042                   input_line_pointer = hold;
1043                   str = hold;
1044                   goto error;
1045                 }
1046
1047               if (opcode->format == FMT_2 || opcode->format == FMT_5)
1048                 extra_shift = 8;
1049               else if (opcode->format == FMT_3 || opcode->format == FMT_6
1050                        || opcode->format == FMT_7)
1051                 extra_shift = 16;
1052               else
1053                 extra_shift = 0;
1054
1055               mn10200_insert_operand (&insn, &extension, operand,
1056                                       ex.X_add_number, NULL,
1057                                       0, extra_shift);
1058
1059               break;
1060
1061             case O_constant:
1062               /* If this operand can be promoted, and it doesn't
1063                  fit into the allocated bitfield for this insn,
1064                  then promote it (ie this opcode does not match).  */
1065               if (operand->flags
1066                   & (MN10200_OPERAND_PROMOTE | MN10200_OPERAND_RELAX)
1067                   && !check_operand (insn, operand, ex.X_add_number))
1068                 {
1069                   input_line_pointer = hold;
1070                   str = hold;
1071                   goto error;
1072                 }
1073
1074               mn10200_insert_operand (&insn, &extension, operand,
1075                                       ex.X_add_number, NULL,
1076                                       0, 0);
1077               break;
1078
1079             default:
1080               /* If this operand can be promoted, then this opcode didn't
1081                  match since we can't know if it needed promotion!  */
1082               if (operand->flags & MN10200_OPERAND_PROMOTE)
1083                 {
1084                   input_line_pointer = hold;
1085                   str = hold;
1086                   goto error;
1087                 }
1088
1089               /* We need to generate a fixup for this expression.  */
1090               if (fc >= MAX_INSN_FIXUPS)
1091                 as_fatal (_("too many fixups"));
1092               fixups[fc].exp = ex;
1093               fixups[fc].opindex = *opindex_ptr;
1094               fixups[fc].reloc = BFD_RELOC_UNUSED;
1095               ++fc;
1096               break;
1097             }
1098
1099         keep_going:
1100           str = input_line_pointer;
1101           input_line_pointer = hold;
1102
1103           while (*str == ' ' || *str == ',')
1104             ++str;
1105
1106         }
1107
1108       /* Make sure we used all the operands!  */
1109       if (*str != ',')
1110         match = 1;
1111
1112     error:
1113       if (match == 0)
1114         {
1115           next_opcode = opcode + 1;
1116           if (!strcmp (next_opcode->name, opcode->name))
1117             {
1118               opcode = next_opcode;
1119               continue;
1120             }
1121
1122           as_bad ("%s", errmsg);
1123           return;
1124         }
1125       break;
1126     }
1127
1128   while (ISSPACE (*str))
1129     ++str;
1130
1131   if (*str != '\0')
1132     as_bad (_("junk at end of line: `%s'"), str);
1133
1134   input_line_pointer = str;
1135
1136   if (opcode->format == FMT_1)
1137     size = 1;
1138   else if (opcode->format == FMT_2 || opcode->format == FMT_4)
1139     size = 2;
1140   else if (opcode->format == FMT_3 || opcode->format == FMT_5)
1141     size = 3;
1142   else if (opcode->format == FMT_6)
1143     size = 4;
1144   else if (opcode->format == FMT_7)
1145     size = 5;
1146   else
1147     abort ();
1148
1149   /* Write out the instruction.  */
1150   dwarf2_emit_insn (size);
1151   if (relaxable && fc > 0)
1152     {
1153       /* On a 64-bit host the size of an 'int' is not the same
1154          as the size of a pointer, so we need a union to convert
1155          the opindex field of the fr_cgen structure into a char *
1156          so that it can be stored in the frag.  We do not have
1157          to worry about losing accuracy as we are not going to
1158          be even close to the 32bit limit of the int.  */
1159       union
1160       {
1161         int opindex;
1162         char * ptr;
1163       }
1164       opindex_converter;
1165       int type;
1166
1167       /* bCC  */
1168       if (size == 2 && opcode->opcode != 0xfc0000)
1169         {
1170           /* Handle bra specially.  Basically treat it like jmp so
1171              that we automatically handle 8, 16 and 32 bit offsets
1172              correctly as well as jumps to an undefined address.
1173
1174              It is also important to not treat it like other bCC
1175              instructions since the long forms of bra is different
1176              from other bCC instructions.  */
1177           if (opcode->opcode == 0xea00)
1178             type = 8;
1179           else
1180             type = 0;
1181         }
1182       /* jsr  */
1183       else if (size == 3 && opcode->opcode == 0xfd0000)
1184         type = 6;
1185       /* jmp  */
1186       else if (size == 3 && opcode->opcode == 0xfc0000)
1187         type = 8;
1188       /* bCCx  */
1189       else
1190         type = 3;
1191
1192       opindex_converter.opindex = fixups[0].opindex;
1193       f = frag_var (rs_machine_dependent, 8, 8 - size, type,
1194                     fixups[0].exp.X_add_symbol,
1195                     fixups[0].exp.X_add_number,
1196                     opindex_converter.ptr);
1197       number_to_chars_bigendian (f, insn, size);
1198       if (8 - size > 4)
1199         {
1200           number_to_chars_bigendian (f + size, 0, 4);
1201           number_to_chars_bigendian (f + size + 4, 0, 8 - size - 4);
1202         }
1203       else
1204         number_to_chars_bigendian (f + size, 0, 8 - size);
1205     }
1206   else
1207     {
1208       f = frag_more (size);
1209
1210       /* Oh, what a mess.  The instruction is in big endian format, but
1211          16 and 24bit immediates are little endian!  */
1212       if (opcode->format == FMT_3)
1213         {
1214           number_to_chars_bigendian (f, (insn >> 16) & 0xff, 1);
1215           number_to_chars_littleendian (f + 1, insn & 0xffff, 2);
1216         }
1217       else if (opcode->format == FMT_6)
1218         {
1219           number_to_chars_bigendian (f, (insn >> 16) & 0xffff, 2);
1220           number_to_chars_littleendian (f + 2, insn & 0xffff, 2);
1221         }
1222       else if (opcode->format == FMT_7)
1223         {
1224           number_to_chars_bigendian (f, (insn >> 16) & 0xffff, 2);
1225           number_to_chars_littleendian (f + 2, insn & 0xffff, 2);
1226           number_to_chars_littleendian (f + 4, extension & 0xff, 1);
1227         }
1228       else
1229         number_to_chars_bigendian (f, insn, size > 4 ? 4 : size);
1230
1231       /* Create any fixups.  */
1232       for (i = 0; i < fc; i++)
1233         {
1234           const struct mn10200_operand *operand;
1235           int reloc_size;
1236
1237           operand = &mn10200_operands[fixups[i].opindex];
1238           if (fixups[i].reloc != BFD_RELOC_UNUSED)
1239             {
1240               reloc_howto_type *reloc_howto;
1241               int offset;
1242               fixS *fixP;
1243
1244               reloc_howto = bfd_reloc_type_lookup (stdoutput,
1245                                                    fixups[i].reloc);
1246
1247               if (!reloc_howto)
1248                 abort ();
1249
1250               reloc_size = bfd_get_reloc_size (reloc_howto);
1251
1252               if (reloc_size < 1 || reloc_size > 4)
1253                 abort ();
1254
1255               offset = 4 - reloc_size;
1256               fixP = fix_new_exp (frag_now, f - frag_now->fr_literal + offset,
1257                                   reloc_size,
1258                                   &fixups[i].exp,
1259                                   reloc_howto->pc_relative,
1260                                   fixups[i].reloc);
1261
1262               /* PC-relative offsets are from the first byte of the
1263                  next instruction, not from the start of the current
1264                  instruction.  */
1265               if (reloc_howto->pc_relative)
1266                 fixP->fx_offset += reloc_size;
1267             }
1268           else
1269             {
1270               int reloc, pcrel, offset;
1271               fixS *fixP;
1272
1273               reloc = BFD_RELOC_NONE;
1274               /* How big is the reloc?  Remember SPLIT relocs are
1275                  implicitly 32bits.  */
1276               reloc_size = operand->bits;
1277
1278               offset = size - reloc_size / 8;
1279
1280               /* Is the reloc pc-relative?  */
1281               pcrel = (operand->flags & MN10200_OPERAND_PCREL) != 0;
1282
1283               /* Choose a proper BFD relocation type.  */
1284               if (pcrel)
1285                 {
1286                   if (reloc_size == 8)
1287                     reloc = BFD_RELOC_8_PCREL;
1288                   else if (reloc_size == 24)
1289                     reloc = BFD_RELOC_24_PCREL;
1290                   else
1291                     abort ();
1292                 }
1293               else
1294                 {
1295                   if (reloc_size == 32)
1296                     reloc = BFD_RELOC_32;
1297                   else if (reloc_size == 16)
1298                     reloc = BFD_RELOC_16;
1299                   else if (reloc_size == 8)
1300                     reloc = BFD_RELOC_8;
1301                   else if (reloc_size == 24)
1302                     reloc = BFD_RELOC_24;
1303                   else
1304                     abort ();
1305                 }
1306
1307               /* Convert the size of the reloc into what fix_new_exp
1308                  wants.  */
1309               reloc_size = reloc_size / 8;
1310               if (reloc_size == 8)
1311                 reloc_size = 0;
1312               else if (reloc_size == 16)
1313                 reloc_size = 1;
1314               else if (reloc_size == 32 || reloc_size == 24)
1315                 reloc_size = 2;
1316
1317               fixP = fix_new_exp (frag_now, f - frag_now->fr_literal + offset,
1318                                   reloc_size, &fixups[i].exp, pcrel,
1319                                   ((bfd_reloc_code_real_type) reloc));
1320
1321               /* PC-relative offsets are from the first byte of the
1322                  next instruction, not from the start of the current
1323                  instruction.  */
1324               if (pcrel)
1325                 fixP->fx_offset += size;
1326             }
1327         }
1328     }
1329 }