gas/config/tc-avr.c

   1 /* tc-avr.c -- Assembler code for the ATMEL AVR
   2
   3    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   4    Contributed by Denis Chertykov <denisc@overta.ru>
   5
   6    This file is part of GAS, the GNU Assembler.
   7
   8    GAS is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2, or (at your option)
  11    any later version.
  12
  13    GAS is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with GAS; see the file COPYING.  If not, write to
  20    the Free Software Foundation, 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include <stdio.h>
  24 #include <ctype.h>
  25 #include "as.h"
  26 #include "subsegs.h"
  27
  28 struct avr_opcodes_s
  29 {
  30   char *name;
  31   char *constraints;
  32   int insn_size;                /* in words */
  33   int isa;
  34   unsigned int bin_opcode;
  35 };
  36
  37 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
  38 {#NAME, CONSTR, SIZE, ISA, BIN},
  39
  40 struct avr_opcodes_s avr_opcodes[] =
  41 {
  42   #include "opcode/avr.h"
  43   {NULL, NULL, 0, 0, 0}
  44 };
  45
  46
  47 const char comment_chars[] = ";";
  48 const char line_comment_chars[] = "#";
  49 const char line_separator_chars[] = "$";
  50
  51 const char *md_shortopts = "m:";
  52 struct mcu_type_s
  53 {
  54   char *name;
  55   int isa;
  56   int mach;
  57 };
  58
  59 static struct mcu_type_s mcu_types[] =
  60 {
  61   {"avr1",      AVR_ISA_TINY1,    bfd_mach_avr1},
  62   {"avr2",      AVR_ISA_85xx,     bfd_mach_avr2},
  63   {"avr3",      AVR_ISA_M103,     bfd_mach_avr3},
  64   {"avr4",      AVR_ISA_ALL,      bfd_mach_avr4},
  65   {"at90s1200", AVR_ISA_1200,     bfd_mach_avr1},
  66   {"attiny10",  AVR_ISA_TINY1,    bfd_mach_avr1},
  67   {"attiny11",  AVR_ISA_TINY1,    bfd_mach_avr1},
  68   {"attiny12",  AVR_ISA_TINY1,    bfd_mach_avr1},
  69   {"attiny15",  AVR_ISA_TINY1,    bfd_mach_avr1},
  70   {"attiny28",  AVR_ISA_TINY1,    bfd_mach_avr1},
  71   {"at90s2313", AVR_ISA_2xxx,     bfd_mach_avr2},
  72   {"at90s2323", AVR_ISA_2xxx,     bfd_mach_avr2},
  73   {"at90s2333", AVR_ISA_2xxx,     bfd_mach_avr2},
  74   {"attiny22" , AVR_ISA_2xxx,     bfd_mach_avr2},
  75   {"at90s2343", AVR_ISA_2xxx,     bfd_mach_avr2},
  76   {"at90s4433", AVR_ISA_2xxx,     bfd_mach_avr2},
  77   {"at90s4414", AVR_ISA_2xxx,     bfd_mach_avr2},
  78   {"at90s4434", AVR_ISA_2xxx,     bfd_mach_avr2},
  79   {"at90s8515", AVR_ISA_85xx,     bfd_mach_avr2},
  80   {"at90s8535", AVR_ISA_85xx,     bfd_mach_avr2},
  81   {"at90c8534", AVR_ISA_85xx,     bfd_mach_avr2},
  82   {"atmega603", AVR_ISA_M603,     bfd_mach_avr3},
  83   {"atmega103", AVR_ISA_M103,     bfd_mach_avr3},
  84   {"atmega161", AVR_ISA_M161,     bfd_mach_avr4},
  85   {"at94k10",   AVR_ISA_94K,      bfd_mach_avr4},
  86   {"at94k20",   AVR_ISA_94K,      bfd_mach_avr4},
  87   {"at94k40",   AVR_ISA_94K,      bfd_mach_avr4},
  88   {NULL, 0, 0}
  89 };
  90
  91
  92 /* Current MCU type.  */
  93 static struct mcu_type_s default_mcu = {"avr2", AVR_ISA_2xxx,bfd_mach_avr2};
  94 static struct mcu_type_s *avr_mcu = &default_mcu;
  95
  96 const char EXP_CHARS[] = "eE";
  97 const char FLT_CHARS[] = "dD";
  98 static void avr_set_arch (int dummy);
  99
 100 /* The target specific pseudo-ops which we support.  */
 101 const pseudo_typeS md_pseudo_table[] =
 102 {
 103   {"arch", avr_set_arch,        0},
 104   { NULL,       NULL,           0}
 105 };
 106
 107 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
 108
 109 static char * skip_space (char * s);
 110 static char * extract_word (char *from, char *to, int limit);
 111 static unsigned int avr_operand (struct avr_opcodes_s *opcode,
 112                                  int where, char *op, char **line);
 113 static unsigned int avr_operands (struct avr_opcodes_s *opcode, char **line);
 114 static unsigned int avr_get_constant (char * str, int max);
 115 static char *parse_exp (char *s, expressionS * op);
 116 static bfd_reloc_code_real_type avr_ldi_expression (expressionS *exp);
 117 long md_pcrel_from_section PARAMS ((fixS *, segT));
 118
 119
 120 #define EXP_MOD_NAME(i) exp_mod[i].name
 121 #define EXP_MOD_RELOC(i) exp_mod[i].reloc
 122 #define EXP_MOD_NEG_RELOC(i) exp_mod[i].neg_reloc
 123 #define HAVE_PM_P(i) exp_mod[i].have_pm
 124
 125 struct exp_mod_s
 126 {
 127   char * name;
 128   bfd_reloc_code_real_type reloc;
 129   bfd_reloc_code_real_type neg_reloc;
 130   int have_pm;
 131 };
 132
 133 static struct exp_mod_s exp_mod[] = {
 134   {"hh8",    BFD_RELOC_AVR_HH8_LDI,    BFD_RELOC_AVR_HH8_LDI_NEG,    1},
 135   {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM, BFD_RELOC_AVR_HH8_LDI_PM_NEG, 0},
 136   {"hi8",    BFD_RELOC_AVR_HI8_LDI,    BFD_RELOC_AVR_HI8_LDI_NEG,    1},
 137   {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM, BFD_RELOC_AVR_HI8_LDI_PM_NEG, 0},
 138   {"lo8",    BFD_RELOC_AVR_LO8_LDI,    BFD_RELOC_AVR_LO8_LDI_NEG,    1},
 139   {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM, BFD_RELOC_AVR_LO8_LDI_PM_NEG, 0},
 140   {"hlo8",   -BFD_RELOC_AVR_LO8_LDI,   -BFD_RELOC_AVR_LO8_LDI_NEG,   0},
 141   {"hhi8",   -BFD_RELOC_AVR_HI8_LDI,   -BFD_RELOC_AVR_HI8_LDI_NEG,   0},
 142 };
 143
 144 /* Opcode hash table.  */
 145 static struct hash_control *avr_hash;
 146
 147 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx).  */
 148 static struct hash_control *avr_mod_hash;
 149
 150 #define OPTION_MMCU (OPTION_MD_BASE + 1)
 151
 152 struct option md_longopts[] = {
 153   {"mmcu", required_argument, NULL, 'm'},
 154   {NULL, no_argument, NULL, 0}
 155 };
 156 size_t md_longopts_size = sizeof(md_longopts);
 157
 158 static inline char *
 159 skip_space (s)
 160      char * s;
 161 {
 162   while (*s == ' ' || *s == '\t')
 163     ++s;
 164   return s;
 165 }
 166
 167 /* Extract one word from FROM and copy it to TO.  */
 168 static char *
 169 extract_word (char *from, char *to, int limit)
 170 {
 171   char *op_start;
 172   char *op_end;
 173   int size = 0;
 174
 175   /* Drop leading whitespace.  */
 176   from = skip_space (from);
 177   *to = 0;
 178   /* Find the op code end.  */
 179   for (op_start = op_end = from; *op_end != 0 && is_part_of_name(*op_end); )
 180     {
 181       to[size++] = *op_end++;
 182       if (size + 1 >= limit)
 183         break;
 184     }
 185   to[size] = 0;
 186   return op_end;
 187 }
 188
 189 int
 190 md_estimate_size_before_relax (fragp, seg)
 191      fragS *fragp ATTRIBUTE_UNUSED;
 192      asection *seg ATTRIBUTE_UNUSED;
 193 {
 194   abort ();
 195   return 0;
 196 }
 197
 198 void
 199 md_show_usage (stream)
 200   FILE *stream;
 201 {
 202   fprintf
 203     (stream,
 204      _ ("AVR options:\n"
 205         "  -mmcu=[avr-name] select microcontroller variant\n"
 206         "                   [avr-name] can be:\n"
 207         "                   avr1 - AT90S1200\n"
 208         "                   avr2 - AT90S2xxx, AT90S4xxx, AT90S85xx, ATtiny22\n"
 209         "                   avr3 - ATmega103 or ATmega603\n"
 210         "                   avr4 - ATmega161\n"
 211         "                   or immediate microcontroller name.\n"));
 212 }
 213
 214 static void
 215 avr_set_arch (dummy)
 216      int dummy ATTRIBUTE_UNUSED;
 217 {
 218   char * str;
 219   str = (char *)alloca (20);
 220   input_line_pointer = extract_word (input_line_pointer, str, 20);
 221   md_parse_option ('m', str);
 222   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 223 }
 224
 225 int
 226 md_parse_option (c, arg)
 227      int c;
 228      char *arg;
 229 {
 230   char *t = alloca (strlen (arg) + 1);
 231   char *s = t;
 232   char *arg1 = arg;
 233   do
 234     *t = tolower (*arg1++);
 235   while (*t++);
 236
 237   if (c == 'm')
 238     {
 239       int i;
 240
 241       for (i = 0; mcu_types[i].name; ++i)
 242         if (strcmp (mcu_types[i].name, s) == 0)
 243           break;
 244
 245       if (!mcu_types[i].name)
 246         as_fatal (_ ("unknown MCU: %s\n"), arg);
 247       if (avr_mcu == &default_mcu)
 248         avr_mcu = &mcu_types[i];
 249       else
 250         as_fatal (_ ("redefinition of mcu type `%s'"), mcu_types[i].name);
 251       return 1;
 252     }
 253   return 0;
 254 }
 255
 256 symbolS *
 257 md_undefined_symbol(name)
 258      char *name ATTRIBUTE_UNUSED;
 259 {
 260   return 0;
 261 }
 262
 263 /* Convert a string pointed to by input_line_pointer into a floating point
 264    constant of type `type', and store the appropriate bytes to `*litP'.
 265    The number of LITTLENUMS emitted is stored in `*sizeP'.  Returns NULL if
 266    OK, or an error message otherwise.  */
 267 char *
 268 md_atof (type, litP, sizeP)
 269      int type;
 270      char *litP;
 271      int *sizeP;
 272 {
 273   int prec;
 274   LITTLENUM_TYPE words[4];
 275   LITTLENUM_TYPE *wordP;
 276   char *t;
 277
 278   switch (type)
 279     {
 280     case 'f':
 281       prec = 2;
 282       break;
 283     case 'd':
 284       prec = 4;
 285       break;
 286     default:
 287       *sizeP = 0;
 288       return _("bad call to md_atof");
 289     }
 290
 291   t = atof_ieee (input_line_pointer, type, words);
 292   if (t)
 293     input_line_pointer = t;
 294
 295   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 296   /* This loop outputs the LITTLENUMs in REVERSE order.  */
 297   for (wordP = words + prec - 1; prec--;)
 298     {
 299       md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
 300       litP += sizeof (LITTLENUM_TYPE);
 301     }
 302   return NULL;
 303 }
 304
 305 void
 306 md_convert_frag (abfd, sec, fragP)
 307   bfd *abfd ATTRIBUTE_UNUSED;
 308   asection *sec ATTRIBUTE_UNUSED;
 309   fragS *fragP ATTRIBUTE_UNUSED;
 310 {
 311   abort ();
 312 }
 313
 314
 315 void
 316 md_begin ()
 317 {
 318   unsigned int i;
 319   struct avr_opcodes_s *opcode;
 320   avr_hash = hash_new();
 321
 322   /* Insert unique names into hash table.  This hash table then provides a
 323      quick index to the first opcode with a particular name in the opcode
 324      table.  */
 325
 326   for (opcode = avr_opcodes; opcode->name; opcode++)
 327     hash_insert (avr_hash, opcode->name, (char *) opcode);
 328
 329   avr_mod_hash = hash_new ();
 330
 331   for (i = 0; i < sizeof (exp_mod) / sizeof (exp_mod[0]); ++i)
 332     hash_insert (avr_mod_hash, EXP_MOD_NAME(i), (void*)(i+10));
 333
 334   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 335 }
 336
 337
 338 /* Resolve STR as a constant expression and return the result.
 339    If result greater than MAX then error. */
 340
 341 static unsigned int
 342 avr_get_constant (str, max)
 343      char * str;
 344      int max;
 345 {
 346   expressionS ex;
 347   str = skip_space (str);
 348   input_line_pointer = str;
 349   expression (&ex);
 350
 351   if (ex.X_op != O_constant)
 352     as_bad (_("constant value required"));
 353
 354   if (ex.X_add_number > max || ex.X_add_number < 0)
 355     as_bad (_("number must be less than %d"), max+1);
 356   return ex.X_add_number;
 357 }
 358
 359
 360 /* Parse instruction operands.
 361    Returns binary opcode. */
 362
 363 static unsigned int
 364 avr_operands (opcode, line)
 365      struct avr_opcodes_s *opcode;
 366      char **line;
 367 {
 368   char *op = opcode->constraints;
 369   unsigned int bin = opcode->bin_opcode;
 370   char *frag = frag_more (opcode->insn_size * 2);
 371   char *str = *line;
 372   int where = frag - frag_now->fr_literal;
 373   static unsigned int prev = 0;  /* previous opcode */
 374
 375   /* Opcode have operands.  */
 376   if (*op)
 377     {
 378       unsigned int reg1 = 0;
 379       unsigned int reg2 = 0;
 380       int reg1_present = 0;
 381       int reg2_present = 0;
 382
 383       /* Parse first operand.  */
 384       if (REGISTER_P (*op))
 385         reg1_present = 1;
 386       reg1 = avr_operand (opcode, where, op, &str);
 387       ++op;
 388
 389       /* Parse second operand.  */
 390       if (*op)
 391         {
 392           if (*op == ',')
 393             ++op;
 394           if (*op == '=')
 395             {
 396               reg2 = reg1;
 397               reg2_present = 1;
 398             }
 399           else
 400             {
 401               if (REGISTER_P (*op))
 402                 reg2_present = 1;
 403
 404               str = skip_space (str);
 405               if (*str++ != ',')
 406                 as_bad (_ ("`,' required"));
 407               str = skip_space (str);
 408
 409               reg2 = avr_operand (opcode, where, op, &str);
 410
 411             }
 412           if (reg1_present && reg2_present)
 413             reg2 = (reg2 & 0xf) | ((reg2 << 5) & 0x200);
 414           else if (reg2_present)
 415             reg2 <<= 4;
 416         }
 417       if (reg1_present)
 418         reg1 <<= 4;
 419       bin |= reg1 | reg2;
 420     }
 421
 422   /* detect undefined combinations (like lpm r31,Z+) */
 423     if (((bin & 0xFDEF) == 0x91AD) || ((bin & 0xFDEF) == 0x91AE) ||
 424         ((bin & 0xFDEF) == 0x91C9) || ((bin & 0xFDEF) == 0x91CA) ||
 425         ((bin & 0xFDEF) == 0x91E1) || ((bin & 0xFDEF) == 0x91E2) ||
 426         ((bin & 0xFFED) == 0x91E5))
 427       as_warn( _("undefined combination of operands"));
 428
 429   if (opcode->insn_size == 2)
 430     {
 431       /* warn if previous opcode was cpse/sbic/sbis/sbrc/sbrs
 432          (AVR core bug)  */
 433       if ((prev & 0xFC00) == 0x1000
 434           || (prev & 0xFD00) == 0x9900
 435           || (prev & 0xFC08) == 0xFC00)
 436         as_warn (_("skipping two-word instruction"));
 437
 438       bfd_putl32 ((bfd_vma)bin, frag);
 439     }
 440   else
 441     bfd_putl16 ((bfd_vma)bin, frag);
 442
 443   prev = bin;
 444   *line = str;
 445   return bin;
 446 }
 447
 448
 449 /* Parse one instruction operand.
 450    Returns operand bitmask. Also fixups can be generated.  */
 451
 452 static unsigned int
 453 avr_operand (opcode, where, op, line)
 454      struct avr_opcodes_s *opcode;
 455      int where;
 456      char *op;
 457      char **line;
 458 {
 459   expressionS op_expr;
 460   unsigned int op_mask = 0;
 461   char *str = skip_space (*line);
 462
 463   switch (*op)
 464     {
 465       /* Any register operand.  */
 466     case 'w':
 467     case 'd':
 468     case 'r':
 469     case 'a':
 470     case 'v':
 471       {
 472         op_mask = -1;
 473
 474         if (*str == 'r' || *str == 'R')
 475           {
 476             char r_name[20];
 477
 478             str = extract_word (str, r_name, sizeof (r_name));
 479             if (isdigit(r_name[1]))
 480               {
 481                 if (r_name[2] == '\0')
 482                   op_mask = r_name[1] - '0';
 483                 else if (r_name[1] != '0'
 484                          && isdigit(r_name[2])
 485                          && r_name[3] == '\0')
 486                   op_mask = (r_name[1] - '0') * 10 + r_name[2] - '0';
 487               }
 488           }
 489         else
 490           {
 491             op_mask = avr_get_constant (str, 31);
 492             str = input_line_pointer;
 493           }
 494
 495         if (op_mask <= 31)
 496           {
 497             switch (*op)
 498               {
 499               case 'a':
 500                 if (op_mask < 16 || op_mask > 23)
 501                   as_bad (_ ("register r16-r23 required"));
 502                 op_mask -= 16;
 503                 break;
 504
 505               case 'd':
 506                 if (op_mask < 16)
 507                   as_bad (_ ("register number above 15 required"));
 508                 op_mask -= 16;
 509                 break;
 510
 511               case 'v':
 512                 if (op_mask & 1)
 513                   as_bad (_ ("even register number required"));
 514                 op_mask >>= 1;
 515                 break;
 516
 517               case 'w':
 518                 op_mask -= 24;
 519                 if (op_mask & 1 || op_mask > 6)
 520                   as_bad (_ ("register r24,r26,r28 or r30 required"));
 521                 op_mask >>= 1;
 522                 break;
 523               }
 524             break;
 525           }
 526         as_bad (_ ("register name or number from 0 to 31 required"));
 527       }
 528       break;
 529
 530     case 'e':
 531       {
 532         char c;
 533         if (*str == '-')
 534           {
 535             str = skip_space (str+1);
 536             op_mask = 0x1002;
 537           }
 538         c = tolower (*str);
 539         if (c == 'x')
 540           op_mask |= 0x100c;
 541         else if (c == 'y')
 542           op_mask |= 0x8;
 543         else if (c != 'z')
 544           as_bad (_ ("pointer register (X,Y or Z) required"));
 545
 546         str = skip_space (str+1);
 547         if (*str == '+')
 548           {
 549             ++str;
 550             if (op_mask & 2)
 551               as_bad (_ ("cannot both predecrement and postincrement"));
 552             op_mask |= 0x1001;
 553           }
 554         /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
 555            registers, no predecrement, no postincrement */
 556         if ((op_mask & 0x100F) && !(avr_mcu->isa & AVR_ISA_SRAM))
 557           as_bad (_ ("addressing mode not supported"));
 558       }
 559       break;
 560
 561     case 'z':
 562       {
 563         if (*str == '-')
 564           as_bad (_ ("can't predecrement"));
 565
 566         if (! (*str == 'z' || *str == 'Z'))
 567           as_bad (_ ("pointer register Z required"));
 568
 569         str = skip_space (str + 1);
 570         if (*str == '+')
 571           {
 572             ++str;
 573             op_mask |= 1;
 574           }
 575       }
 576       break;
 577
 578     case 'b':
 579       {
 580         char c = tolower (*str++);
 581         if (c == 'y')
 582           op_mask |= 0x8;
 583         else if (c != 'z')
 584           as_bad (_ ("pointer register (Y or Z) required"));
 585         str = skip_space (str);
 586         if (*str++ == '+')
 587           {
 588             unsigned int x;
 589             x = avr_get_constant (str, 63);
 590             str = input_line_pointer;
 591             op_mask |= (x & 7) | ((x & (3 << 3)) << 7) | ((x & (1 << 5)) << 8);
 592           }
 593       }
 594       break;
 595
 596     case 'h':
 597       {
 598         str = parse_exp (str, &op_expr);
 599         fix_new_exp (frag_now, where, opcode->insn_size * 2,
 600                      &op_expr, false, BFD_RELOC_AVR_CALL);
 601
 602       }
 603       break;
 604
 605     case 'L':
 606       {
 607         str = parse_exp (str, &op_expr);
 608         fix_new_exp (frag_now, where, opcode->insn_size * 2,
 609                      &op_expr, true, BFD_RELOC_AVR_13_PCREL);
 610
 611       }
 612       break;
 613
 614     case 'l':
 615       {
 616         str = parse_exp (str, &op_expr);
 617         fix_new_exp (frag_now, where, opcode->insn_size * 2,
 618                      &op_expr, true, BFD_RELOC_AVR_7_PCREL);
 619
 620       }
 621       break;
 622
 623     case 'i':
 624       {
 625         str = parse_exp (str, &op_expr);
 626         fix_new_exp (frag_now, where+2, opcode->insn_size * 2,
 627                      &op_expr, false, BFD_RELOC_16);
 628
 629       }
 630       break;
 631
 632     case 'M':
 633       {
 634         bfd_reloc_code_real_type r_type;
 635         input_line_pointer = str;
 636         r_type = avr_ldi_expression (&op_expr);
 637         str = input_line_pointer;
 638         fix_new_exp (frag_now, where, 3,
 639                      &op_expr, false, r_type);
 640       }
 641       break;
 642
 643     case 'n':
 644       {
 645         unsigned int x;
 646         x = ~avr_get_constant (str, 255);
 647         str = input_line_pointer;
 648         op_mask |= (x & 0xf) | ((x << 4) & 0xf00);
 649       }
 650       break;
 651
 652     case 'K':
 653       {
 654         unsigned int x;
 655         x = avr_get_constant (str, 63);
 656         str = input_line_pointer;
 657         op_mask |= (x & 0xf) | ((x & 0x30) << 2);
 658       }
 659       break;
 660
 661     case 'S':
 662     case 's':
 663       {
 664         unsigned int x;
 665         x = avr_get_constant (str, 7);
 666         str = input_line_pointer;
 667         if (*op == 'S')
 668           x <<= 4;
 669         op_mask |= x;
 670       }
 671       break;
 672
 673     case 'P':
 674       {
 675         unsigned int x;
 676         x = avr_get_constant (str, 63);
 677         str = input_line_pointer;
 678         op_mask |= (x & 0xf) | ((x & 0x30) << 5);
 679       }
 680       break;
 681
 682     case 'p':
 683       {
 684         unsigned int x;
 685         x = avr_get_constant (str, 31);
 686         str = input_line_pointer;
 687         op_mask |= x << 3;
 688       }
 689       break;
 690     case '?':
 691       break;
 692     default:
 693       as_bad (_ ("unknown constraint `%c'"), *op);
 694     }
 695   *line = str;
 696   return op_mask;
 697 }
 698
 699 /* GAS will call this function for each section at the end of the assembly,
 700    to permit the CPU backend to adjust the alignment of a section.  */
 701 valueT
 702 md_section_align (seg, addr)
 703      asection *seg;
 704      valueT addr;
 705 {
 706   int align = bfd_get_section_alignment (stdoutput, seg);
 707   return ((addr + (1 << align) - 1) & (-1 << align));
 708 }
 709
 710 /* If you define this macro, it should return the offset between the
 711    address of a PC relative fixup and the position from which the PC
 712    relative adjustment should be made.  On many processors, the base
 713    of a PC relative instruction is the next instruction, so this
 714    macro would return the length of an instruction.  */
 715 long
 716 md_pcrel_from_section (fixp, sec)
 717      fixS *fixp;
 718      segT sec;
 719 {
 720   if (fixp->fx_addsy != (symbolS *)NULL
 721       && (!S_IS_DEFINED (fixp->fx_addsy)
 722           || (S_GET_SEGMENT (fixp->fx_addsy) != sec)))
 723     return 0;
 724   return fixp->fx_frag->fr_address + fixp->fx_where;
 725 }
 726
 727 /* GAS will call this for each fixup.  It should store the correct
 728    value in the object file. */
 729 int
 730 md_apply_fix3 (fixp, valuep, seg)
 731      fixS *fixp;
 732      valueT *valuep;
 733      segT seg;
 734 {
 735   unsigned char *where;
 736   unsigned long insn;
 737   long value;
 738
 739   if (fixp->fx_addsy == (symbolS *) NULL)
 740     {
 741       value = *valuep;
 742       fixp->fx_done = 1;
 743     }
 744   else if (fixp->fx_pcrel)
 745     {
 746       segT s = S_GET_SEGMENT (fixp->fx_addsy);
 747       if (fixp->fx_addsy && (s == seg || s == absolute_section))
 748         {
 749           value = S_GET_VALUE (fixp->fx_addsy) + *valuep;
 750           fixp->fx_done = 1;
 751         }
 752       else
 753         value = *valuep;
 754     }
 755   else
 756     {
 757       value = fixp->fx_offset;
 758       if (fixp->fx_subsy != (symbolS *) NULL)
 759         {
 760           if (S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
 761             {
 762               value -= S_GET_VALUE (fixp->fx_subsy);
 763               fixp->fx_done = 1;
 764             }
 765           else
 766             {
 767               /* We don't actually support subtracting a symbol.  */
 768               as_bad_where (fixp->fx_file, fixp->fx_line,
 769                             _ ("expression too complex"));
 770             }
 771         }
 772     }
 773   switch (fixp->fx_r_type)
 774     {
 775     default:
 776       fixp->fx_no_overflow = 1;
 777       break;
 778     case BFD_RELOC_AVR_7_PCREL:
 779     case BFD_RELOC_AVR_13_PCREL:
 780     case BFD_RELOC_32:
 781     case BFD_RELOC_16:
 782     case BFD_RELOC_AVR_CALL:
 783       break;
 784     }
 785
 786   if (fixp->fx_done)
 787     {
 788       /* Fetch the instruction, insert the fully resolved operand
 789          value, and stuff the instruction back again.  */
 790       where = fixp->fx_frag->fr_literal + fixp->fx_where;
 791       insn = bfd_getl16 (where);
 792
 793       switch (fixp->fx_r_type)
 794         {
 795         case BFD_RELOC_AVR_7_PCREL:
 796           if (value & 1)
 797             as_bad_where (fixp->fx_file, fixp->fx_line,
 798                           _("odd address operand: %ld"), value);
 799           /* Instruction addresses are always right-shifted by 1.  */
 800           value >>= 1;
 801           --value;                      /* Correct PC.  */
 802           if (value < -64 || value > 63)
 803             as_bad_where (fixp->fx_file, fixp->fx_line,
 804                           _("operand out of range: %ld"), value);
 805           value = (value << 3) & 0x3f8;
 806           bfd_putl16 ((bfd_vma) (value | insn), where);
 807           break;
 808
 809         case BFD_RELOC_AVR_13_PCREL:
 810           if (value & 1)
 811             as_bad_where (fixp->fx_file, fixp->fx_line,
 812                           _("odd address operand: %ld"), value);
 813           /* Instruction addresses are always right-shifted by 1.  */
 814           value >>= 1;
 815           --value;                      /* Correct PC.  */
 816
 817           if (value < -2048 || value > 2047)
 818             {
 819               if (avr_mcu->isa & AVR_ISA_WRAP)
 820                 {
 821                   if (value > 2047)
 822                     value -= 4096;
 823                   else
 824                     value += 4096;
 825                 }
 826               else
 827                 as_bad_where (fixp->fx_file, fixp->fx_line,
 828                               _("operand out of range: %ld"), value);
 829             }
 830
 831           value &= 0xfff;
 832           bfd_putl16 ((bfd_vma) (value | insn), where);
 833           break;
 834
 835         case BFD_RELOC_32:
 836           bfd_putl16 ((bfd_vma) value, where);
 837           break;
 838
 839         case BFD_RELOC_16:
 840           bfd_putl16 ((bfd_vma) value, where);
 841           break;
 842
 843         case BFD_RELOC_AVR_16_PM:
 844           bfd_putl16 ((bfd_vma) (value>>1), where);
 845           break;
 846
 847         case BFD_RELOC_AVR_LO8_LDI:
 848           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value), where);
 849           break;
 850
 851         case -BFD_RELOC_AVR_LO8_LDI:
 852           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 16), where);
 853           break;
 854
 855         case BFD_RELOC_AVR_HI8_LDI:
 856           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 8), where);
 857           break;
 858
 859         case -BFD_RELOC_AVR_HI8_LDI:
 860           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 24), where);
 861           break;
 862
 863         case BFD_RELOC_AVR_HH8_LDI:
 864           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 16), where);
 865           break;
 866
 867         case BFD_RELOC_AVR_LO8_LDI_NEG:
 868           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value), where);
 869           break;
 870
 871         case -BFD_RELOC_AVR_LO8_LDI_NEG:
 872           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 16), where);
 873           break;
 874
 875         case BFD_RELOC_AVR_HI8_LDI_NEG:
 876           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 8), where);
 877           break;
 878
 879         case -BFD_RELOC_AVR_HI8_LDI_NEG:
 880           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 24), where);
 881           break;
 882
 883         case BFD_RELOC_AVR_HH8_LDI_NEG:
 884           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 16), where);
 885           break;
 886
 887         case BFD_RELOC_AVR_LO8_LDI_PM:
 888           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 1), where);
 889           break;
 890
 891         case BFD_RELOC_AVR_HI8_LDI_PM:
 892           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 9), where);
 893           break;
 894
 895         case BFD_RELOC_AVR_HH8_LDI_PM:
 896           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 17), where);
 897           break;
 898
 899         case BFD_RELOC_AVR_LO8_LDI_PM_NEG:
 900           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 1), where);
 901           break;
 902
 903         case BFD_RELOC_AVR_HI8_LDI_PM_NEG:
 904           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 9), where);
 905           break;
 906
 907         case BFD_RELOC_AVR_HH8_LDI_PM_NEG:
 908           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 17), where);
 909           break;
 910
 911         case BFD_RELOC_AVR_CALL:
 912           {
 913             unsigned long x;
 914             x = bfd_getl16 (where);
 915             if (value & 1)
 916               as_bad_where (fixp->fx_file, fixp->fx_line,
 917                             _("odd address operand: %ld"), value);
 918             value >>= 1;
 919             x |= ((value & 0x10000) | ((value << 3) & 0x1f00000)) >> 16;
 920             bfd_putl16 ((bfd_vma) x, where);
 921             bfd_putl16 ((bfd_vma) (value & 0xffff), where+2);
 922           }
 923           break;
 924
 925         default:
 926           as_fatal ( _("line %d: unknown relocation type: 0x%x"),
 927                      fixp->fx_line, fixp->fx_r_type);
 928           break;
 929         }
 930     }
 931   else
 932     {
 933       switch (fixp->fx_r_type)
 934         {
 935         case -BFD_RELOC_AVR_HI8_LDI_NEG:
 936         case -BFD_RELOC_AVR_HI8_LDI:
 937         case -BFD_RELOC_AVR_LO8_LDI_NEG:
 938         case -BFD_RELOC_AVR_LO8_LDI:
 939           as_bad_where (fixp->fx_file, fixp->fx_line,
 940                         _("only constant expression allowed"));
 941           fixp->fx_done = 1;
 942           break;
 943         default:
 944           break;
 945         }
 946       fixp->fx_addnumber = value;
 947     }
 948   return 0;
 949 }
 950
 951
 952 /* A `BFD_ASSEMBLER' GAS will call this to generate a reloc.  GAS
 953    will pass the resulting reloc to `bfd_install_relocation'.  This
 954    currently works poorly, as `bfd_install_relocation' often does the
 955    wrong thing, and instances of `tc_gen_reloc' have been written to
 956    work around the problems, which in turns makes it difficult to fix
 957    `bfd_install_relocation'. */
 958
 959 /* If while processing a fixup, a reloc really needs to be created
 960    then it is done here.  */
 961
 962 arelent *
 963 tc_gen_reloc (seg, fixp)
 964      asection *seg ATTRIBUTE_UNUSED;
 965      fixS *fixp;
 966 {
 967   arelent *reloc;
 968
 969   reloc = (arelent *) xmalloc (sizeof (arelent));
 970
 971   reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
 972   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 973
 974   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
 975   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
 976   if (reloc->howto == (reloc_howto_type *) NULL)
 977     {
 978       as_bad_where (fixp->fx_file, fixp->fx_line,
 979                     _("reloc %d not supported by object file format"),
 980                     (int)fixp->fx_r_type);
 981       return NULL;
 982     }
 983
 984   if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 985       || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 986     reloc->address = fixp->fx_offset;
 987
 988   reloc->addend = fixp->fx_offset;
 989
 990   return reloc;
 991 }
 992
 993
 994 void
 995 md_assemble (str)
 996      char *str;
 997 {
 998   struct avr_opcodes_s * opcode;
 999   char op[11];
1000
1001   str = skip_space (extract_word (str, op, sizeof(op)));
1002
1003   if (!op[0])
1004     as_bad (_ ("can't find opcode "));
1005
1006   opcode = (struct avr_opcodes_s *) hash_find (avr_hash, op);
1007
1008   if (opcode == NULL)
1009     {
1010       as_bad (_ ("unknown opcode `%s'"), op);
1011       return;
1012     }
1013
1014   /* Special case for opcodes with optional operands (lpm, elpm) -
1015      version with operands exists in avr_opcodes[] in the next entry.  */
1016
1017   if (*str && *opcode->constraints == '?')
1018     ++opcode;
1019
1020   if ((opcode->isa & avr_mcu->isa) != opcode->isa)
1021     as_bad (_ ("illegal opcode %s for mcu %s"), opcode->name, avr_mcu->name);
1022
1023   /* We used to set input_line_pointer to the result of get_operands,
1024      but that is wrong.  Our caller assumes we don't change it.  */
1025   {
1026     char *t = input_line_pointer;
1027     avr_operands (opcode, &str);
1028     if (*skip_space (str))
1029       as_bad (_ ("garbage at end of line"));
1030     input_line_pointer = t;
1031   }
1032 }
1033
1034 /* Parse ordinary expression.  */
1035 static char *
1036 parse_exp (s, op)
1037      char *s;
1038      expressionS * op;
1039 {
1040   input_line_pointer = s;
1041   expression (op);
1042   if (op->X_op == O_absent)
1043     as_bad (_("missing operand"));
1044   return input_line_pointer;
1045 }
1046
1047
1048 /* Parse special expressions (needed for LDI command):
1049    xx8 (address)
1050    xx8 (-address)
1051    pm_xx8 (address)
1052    pm_xx8 (-address)
1053    where xx is: hh, hi, lo
1054 */
1055 static bfd_reloc_code_real_type
1056 avr_ldi_expression (exp)
1057      expressionS *exp;
1058 {
1059   char *str = input_line_pointer;
1060   char *tmp;
1061   char op[8];
1062   int mod;
1063   tmp = str;
1064
1065   str = extract_word (str, op, sizeof (op));
1066   if (op[0])
1067     {
1068       mod = (int) hash_find (avr_mod_hash, op);
1069       if (mod)
1070         {
1071           int closes = 0;
1072           mod -= 10;
1073           str = skip_space (str);
1074           if (*str == '(')
1075             {
1076               int neg_p = 0;
1077               ++str;
1078               if (strncmp ("pm(", str, 3) == 0
1079                   || strncmp ("-(pm(", str, 5) == 0)
1080                 {
1081                   if (HAVE_PM_P(mod))
1082                     {
1083                       ++mod;
1084                       ++closes;
1085                     }
1086                   else
1087                     as_bad (_ ("illegal expression"));
1088                   if (*str == '-')
1089                     {
1090                       neg_p = 1;
1091                       ++closes;
1092                       str += 5;
1093                     }
1094                   else
1095                     str += 3;
1096                 }
1097               if (*str == '-' && *(str + 1) == '(')
1098                 {
1099                   neg_p ^= 1;
1100                   ++closes;
1101                   str += 2;
1102                 }
1103               input_line_pointer = str;
1104               expression (exp);
1105               do
1106                 {
1107                   if (*input_line_pointer != ')')
1108                     {
1109                       as_bad (_ ("`)' required"));
1110                       break;
1111                     }
1112                   input_line_pointer++;
1113                 }
1114               while (closes--);
1115               return neg_p ? EXP_MOD_NEG_RELOC (mod) : EXP_MOD_RELOC (mod);
1116             }
1117         }
1118     }
1119   input_line_pointer = tmp;
1120   expression (exp);
1121   return BFD_RELOC_AVR_LO8_LDI;
1122 }
1123
1124 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1125    `avr_cons_fix_new' */
1126 static int exp_mod_pm = 0;
1127
1128 /* Parse special CONS expression: pm (expression)
1129    which is used for addressing to a program memory.
1130    Relocation: BFD_RELOC_AVR_16_PM */
1131 void
1132 avr_parse_cons_expression (exp, nbytes)
1133      expressionS *exp;
1134      int nbytes;
1135 {
1136   char * tmp;
1137
1138   exp_mod_pm = 0;
1139
1140   tmp = input_line_pointer = skip_space (input_line_pointer);
1141
1142   if (nbytes == 2)
1143     {
1144       char * pm_name = "pm";
1145       int len = strlen (pm_name);
1146       if (strncasecmp (input_line_pointer, pm_name, len) == 0)
1147         {
1148           input_line_pointer = skip_space (input_line_pointer + len);
1149           if (*input_line_pointer == '(')
1150             {
1151               input_line_pointer = skip_space (input_line_pointer + 1);
1152               exp_mod_pm = 1;
1153               expression (exp);
1154               if (*input_line_pointer == ')')
1155                 ++input_line_pointer;
1156               else
1157                 {
1158                   as_bad (_ ("`)' required"));
1159                   exp_mod_pm = 0;
1160                 }
1161               return;
1162             }
1163           input_line_pointer = tmp;
1164         }
1165     }
1166   expression (exp);
1167 }
1168
1169 void
1170 avr_cons_fix_new(frag, where, nbytes, exp)
1171      fragS *frag;
1172      int where;
1173      int nbytes;
1174      expressionS *exp;
1175 {
1176   if (exp_mod_pm == 0)
1177     {
1178       if (nbytes == 2)
1179         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_16);
1180       else if (nbytes == 4)
1181         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_32);
1182       else
1183         as_bad (_ ("illegal %srelocation size: %d"), "", nbytes);
1184     }
1185   else
1186     {
1187       if (nbytes == 2)
1188         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_AVR_16_PM);
1189       else
1190         as_bad (_ ("illegal %srelocation size: %d"), "`pm' ", nbytes);
1191       exp_mod_pm = 0;
1192     }
1193 }