gas/config/tc-avr.c

   1 /* tc-avr.c -- Assembler code for the ATMEL AVR
   2
   3    Copyright 1999, 2000, 2001 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 "as.h"
  25 #include "safe-ctype.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 const char comment_chars[] = ";";
  47 const char line_comment_chars[] = "#";
  48 const char line_separator_chars[] = "$";
  49
  50 const char *md_shortopts = "m:";
  51 struct mcu_type_s
  52 {
  53   char *name;
  54   int isa;
  55   int mach;
  56 };
  57
  58 /* XXX - devices that don't seem to exist (renamed, replaced with larger
  59    ones, or planned but never produced), left here for compatibility.
  60    TODO: hide them in show_mcu_list output?  */
  61
  62 static struct mcu_type_s mcu_types[] =
  63 {
  64   {"avr1",      AVR_ISA_TINY1,    bfd_mach_avr1},
  65   {"avr2",      AVR_ISA_2xxx,     bfd_mach_avr2},
  66   {"avr3",      AVR_ISA_M103,     bfd_mach_avr3},
  67   {"avr4",      AVR_ISA_M8,       bfd_mach_avr4},
  68   {"avr5",      AVR_ISA_ALL,      bfd_mach_avr5},
  69   {"at90s1200", AVR_ISA_1200,     bfd_mach_avr1},
  70   {"attiny10",  AVR_ISA_TINY1,    bfd_mach_avr1}, /* XXX -> tn11 */
  71   {"attiny11",  AVR_ISA_TINY1,    bfd_mach_avr1},
  72   {"attiny12",  AVR_ISA_TINY1,    bfd_mach_avr1},
  73   {"attiny15",  AVR_ISA_TINY1,    bfd_mach_avr1},
  74   {"attiny28",  AVR_ISA_TINY1,    bfd_mach_avr1},
  75   {"at90s2313", AVR_ISA_2xxx,     bfd_mach_avr2},
  76   {"at90s2323", AVR_ISA_2xxx,     bfd_mach_avr2},
  77   {"at90s2333", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 4433 */
  78   {"attiny22" , AVR_ISA_2xxx,     bfd_mach_avr2},
  79   {"at90s2343", AVR_ISA_2xxx,     bfd_mach_avr2},
  80   {"at90s4433", AVR_ISA_2xxx,     bfd_mach_avr2},
  81   {"at90s4414", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 8515 */
  82   {"at90s4434", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 8535 */
  83   {"at90s8515", AVR_ISA_2xxx,     bfd_mach_avr2},
  84   {"at90s8535", AVR_ISA_2xxx,     bfd_mach_avr2},
  85   {"at90c8534", AVR_ISA_2xxx,     bfd_mach_avr2},
  86   {"atmega603", AVR_ISA_M603,     bfd_mach_avr3}, /* XXX -> m103 */
  87   {"atmega103", AVR_ISA_M103,     bfd_mach_avr3},
  88   {"at43usb320",AVR_ISA_M103,     bfd_mach_avr3},
  89   {"at76c711",  AVR_ISA_M603,     bfd_mach_avr3},
  90   {"atmega8",   AVR_ISA_M8,       bfd_mach_avr4},
  91   {"atmega83",  AVR_ISA_M8,       bfd_mach_avr4}, /* XXX -> m163 */
  92   {"atmega85",  AVR_ISA_M8,       bfd_mach_avr4}, /* XXX -> m8 */
  93   {"atmega16",  AVR_ISA_M323,     bfd_mach_avr5},
  94   {"atmega161", AVR_ISA_M161,     bfd_mach_avr5},
  95   {"atmega163", AVR_ISA_M161,     bfd_mach_avr5},
  96   {"atmega32",  AVR_ISA_M323,     bfd_mach_avr5},
  97   {"atmega323", AVR_ISA_M323,     bfd_mach_avr5},
  98   {"atmega64",  AVR_ISA_M323,     bfd_mach_avr5},
  99   {"atmega128", AVR_ISA_M128,     bfd_mach_avr5},
 100   {"at43usb355",AVR_ISA_94K,      bfd_mach_avr5},
 101   {"at94k",     AVR_ISA_94K,      bfd_mach_avr5},
 102   {NULL, 0, 0}
 103 };
 104
 105 /* Current MCU type.  */
 106 static struct mcu_type_s default_mcu = {"avr2", AVR_ISA_2xxx,bfd_mach_avr2};
 107 static struct mcu_type_s *avr_mcu = &default_mcu;
 108
 109 /* AVR target-specific switches.  */
 110 struct avr_opt_s
 111 {
 112   int all_opcodes;  /* -mall-opcodes: accept all known AVR opcodes  */
 113   int no_skip_bug;  /* -mno-skip-bug: no warnings for skipping 2-word insns  */
 114   int no_wrap;      /* -mno-wrap: reject rjmp/rcall with 8K wrap-around  */
 115 };
 116
 117 static struct avr_opt_s avr_opt = { 0, 0, 0 };
 118
 119 const char EXP_CHARS[] = "eE";
 120 const char FLT_CHARS[] = "dD";
 121 static void avr_set_arch (int dummy);
 122
 123 /* The target specific pseudo-ops which we support.  */
 124 const pseudo_typeS md_pseudo_table[] =
 125 {
 126   {"arch", avr_set_arch,        0},
 127   { NULL,       NULL,           0}
 128 };
 129
 130 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
 131
 132 static void show_mcu_list PARAMS ((FILE *));
 133 static char *skip_space PARAMS ((char *));
 134 static char *extract_word PARAMS ((char *, char *, int));
 135 static unsigned int avr_operand PARAMS ((struct avr_opcodes_s *,
 136                                          int, char *, char **));
 137 static unsigned int avr_operands PARAMS ((struct avr_opcodes_s *, char **));
 138 static unsigned int avr_get_constant PARAMS ((char *, int));
 139 static char *parse_exp PARAMS ((char *, expressionS *));
 140 static bfd_reloc_code_real_type avr_ldi_expression PARAMS ((expressionS *));
 141
 142 #define EXP_MOD_NAME(i) exp_mod[i].name
 143 #define EXP_MOD_RELOC(i) exp_mod[i].reloc
 144 #define EXP_MOD_NEG_RELOC(i) exp_mod[i].neg_reloc
 145 #define HAVE_PM_P(i) exp_mod[i].have_pm
 146
 147 struct exp_mod_s
 148 {
 149   char *name;
 150   bfd_reloc_code_real_type reloc;
 151   bfd_reloc_code_real_type neg_reloc;
 152   int have_pm;
 153 };
 154
 155 static struct exp_mod_s exp_mod[] =
 156 {
 157   {"hh8",    BFD_RELOC_AVR_HH8_LDI,    BFD_RELOC_AVR_HH8_LDI_NEG,    1},
 158   {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM, BFD_RELOC_AVR_HH8_LDI_PM_NEG, 0},
 159   {"hi8",    BFD_RELOC_AVR_HI8_LDI,    BFD_RELOC_AVR_HI8_LDI_NEG,    1},
 160   {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM, BFD_RELOC_AVR_HI8_LDI_PM_NEG, 0},
 161   {"lo8",    BFD_RELOC_AVR_LO8_LDI,    BFD_RELOC_AVR_LO8_LDI_NEG,    1},
 162   {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM, BFD_RELOC_AVR_LO8_LDI_PM_NEG, 0},
 163   {"hlo8",   -BFD_RELOC_AVR_LO8_LDI,   -BFD_RELOC_AVR_LO8_LDI_NEG,   0},
 164   {"hhi8",   -BFD_RELOC_AVR_HI8_LDI,   -BFD_RELOC_AVR_HI8_LDI_NEG,   0},
 165 };
 166
 167 /* Opcode hash table.  */
 168 static struct hash_control *avr_hash;
 169
 170 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx).  */
 171 static struct hash_control *avr_mod_hash;
 172
 173 #define OPTION_MMCU 'm'
 174 #define OPTION_ALL_OPCODES (OPTION_MD_BASE + 1)
 175 #define OPTION_NO_SKIP_BUG (OPTION_MD_BASE + 2)
 176 #define OPTION_NO_WRAP     (OPTION_MD_BASE + 3)
 177
 178 struct option md_longopts[] =
 179 {
 180   { "mmcu",   required_argument, NULL, OPTION_MMCU        },
 181   { "mall-opcodes", no_argument, NULL, OPTION_ALL_OPCODES },
 182   { "mno-skip-bug", no_argument, NULL, OPTION_NO_SKIP_BUG },
 183   { "mno-wrap",     no_argument, NULL, OPTION_NO_WRAP     },
 184   { NULL, no_argument, NULL, 0 }
 185 };
 186
 187 size_t md_longopts_size = sizeof (md_longopts);
 188
 189 /* Display nicely formatted list of known MCU names.  */
 190
 191 static void
 192 show_mcu_list (stream)
 193      FILE *stream;
 194 {
 195   int i, x;
 196
 197   fprintf (stream, _("Known MCU names:"));
 198   x = 1000;
 199
 200   for (i = 0; mcu_types[i].name; i++)
 201     {
 202       int len = strlen (mcu_types[i].name);
 203
 204       x += len + 1;
 205
 206       if (x < 75)
 207         fprintf (stream, " %s", mcu_types[i].name);
 208       else
 209         {
 210           fprintf (stream, "\n  %s", mcu_types[i].name);
 211           x = len + 2;
 212         }
 213     }
 214
 215   fprintf (stream, "\n");
 216 }
 217
 218 static inline char *
 219 skip_space (s)
 220      char *s;
 221 {
 222   while (*s == ' ' || *s == '\t')
 223     ++s;
 224   return s;
 225 }
 226
 227 /* Extract one word from FROM and copy it to TO.  */
 228
 229 static char *
 230 extract_word (char *from, char *to, int limit)
 231 {
 232   char *op_start;
 233   char *op_end;
 234   int size = 0;
 235
 236   /* Drop leading whitespace.  */
 237   from = skip_space (from);
 238   *to = 0;
 239
 240   /* Find the op code end.  */
 241   for (op_start = op_end = from; *op_end != 0 && is_part_of_name (*op_end);)
 242     {
 243       to[size++] = *op_end++;
 244       if (size + 1 >= limit)
 245         break;
 246     }
 247
 248   to[size] = 0;
 249   return op_end;
 250 }
 251
 252 int
 253 md_estimate_size_before_relax (fragp, seg)
 254      fragS *fragp ATTRIBUTE_UNUSED;
 255      asection *seg ATTRIBUTE_UNUSED;
 256 {
 257   abort ();
 258   return 0;
 259 }
 260
 261 void
 262 md_show_usage (stream)
 263      FILE *stream;
 264 {
 265   fprintf (stream,
 266       _("AVR options:\n"
 267         "  -mmcu=[avr-name] select microcontroller variant\n"
 268         "                   [avr-name] can be:\n"
 269         "                   avr1 - AT90S1200, ATtiny1x, ATtiny28\n"
 270         "                   avr2 - AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22\n"
 271         "                   avr3 - ATmega103, ATmega603\n"
 272         "                   avr4 - ATmega83, ATmega85\n"
 273         "                   avr5 - ATmega161, ATmega163, ATmega32, AT94K\n"
 274         "                   or immediate microcontroller name.\n"));
 275   fprintf (stream,
 276       _("  -mall-opcodes    accept all AVR opcodes, even if not supported by MCU\n"
 277         "  -mno-skip-bug    disable warnings for skipping two-word instructions\n"
 278         "                   (default for avr4, avr5)\n"
 279         "  -mno-wrap        reject rjmp/rcall instructions with 8K wrap-around\n"
 280         "                   (default for avr3, avr5)\n"));
 281   show_mcu_list (stream);
 282 }
 283
 284 static void
 285 avr_set_arch (dummy)
 286      int dummy ATTRIBUTE_UNUSED;
 287 {
 288   char *str;
 289
 290   str = (char *) alloca (20);
 291   input_line_pointer = extract_word (input_line_pointer, str, 20);
 292   md_parse_option (OPTION_MMCU, str);
 293   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 294 }
 295
 296 int
 297 md_parse_option (c, arg)
 298      int c;
 299      char *arg;
 300 {
 301   switch (c)
 302     {
 303     case OPTION_MMCU:
 304       {
 305         int i;
 306         char *s = alloca (strlen (arg) + 1);
 307
 308         {
 309           char *t = s;
 310           char *arg1 = arg;
 311
 312           do
 313             *t = TOLOWER (*arg1++);
 314           while (*t++);
 315         }
 316
 317         for (i = 0; mcu_types[i].name; ++i)
 318           if (strcmp (mcu_types[i].name, s) == 0)
 319             break;
 320
 321         if (!mcu_types[i].name)
 322           {
 323             show_mcu_list (stderr);
 324             as_fatal (_("unknown MCU: %s\n"), arg);
 325           }
 326
 327         /* It is OK to redefine mcu type within the same avr[1-5] bfd machine
 328            type - this for allows passing -mmcu=... via gcc ASM_SPEC as well
 329            as .arch ... in the asm output at the same time.  */
 330         if (avr_mcu == &default_mcu || avr_mcu->mach == mcu_types[i].mach)
 331           avr_mcu = &mcu_types[i];
 332         else
 333           as_fatal (_("redefinition of mcu type `%s' to `%s'"),
 334                     avr_mcu->name, mcu_types[i].name);
 335         return 1;
 336       }
 337     case OPTION_ALL_OPCODES:
 338       avr_opt.all_opcodes = 1;
 339       return 1;
 340     case OPTION_NO_SKIP_BUG:
 341       avr_opt.no_skip_bug = 1;
 342       return 1;
 343     case OPTION_NO_WRAP:
 344       avr_opt.no_wrap = 1;
 345       return 1;
 346     }
 347
 348   return 0;
 349 }
 350
 351 symbolS *
 352 md_undefined_symbol (name)
 353      char *name ATTRIBUTE_UNUSED;
 354 {
 355   return 0;
 356 }
 357
 358 /* Turn a string in input_line_pointer into a floating point constant
 359    of type TYPE, and store the appropriate bytes in *LITP.  The number
 360    of LITTLENUMS emitted is stored in *SIZEP.  An error message is
 361    returned, or NULL on OK.  */
 362
 363 char *
 364 md_atof (type, litP, sizeP)
 365      int type;
 366      char *litP;
 367      int *sizeP;
 368 {
 369   int prec;
 370   LITTLENUM_TYPE words[4];
 371   LITTLENUM_TYPE *wordP;
 372   char *t;
 373
 374   switch (type)
 375     {
 376     case 'f':
 377       prec = 2;
 378       break;
 379     case 'd':
 380       prec = 4;
 381       break;
 382     default:
 383       *sizeP = 0;
 384       return _("bad call to md_atof");
 385     }
 386
 387   t = atof_ieee (input_line_pointer, type, words);
 388   if (t)
 389     input_line_pointer = t;
 390
 391   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 392
 393   /* This loop outputs the LITTLENUMs in REVERSE order.  */
 394   for (wordP = words + prec - 1; prec--;)
 395     {
 396       md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
 397       litP += sizeof (LITTLENUM_TYPE);
 398     }
 399
 400   return NULL;
 401 }
 402
 403 void
 404 md_convert_frag (abfd, sec, fragP)
 405      bfd *abfd ATTRIBUTE_UNUSED;
 406      asection *sec ATTRIBUTE_UNUSED;
 407      fragS *fragP ATTRIBUTE_UNUSED;
 408 {
 409   abort ();
 410 }
 411
 412 void
 413 md_begin ()
 414 {
 415   unsigned int i;
 416   struct avr_opcodes_s *opcode;
 417   avr_hash = hash_new ();
 418
 419   /* Insert unique names into hash table.  This hash table then provides a
 420      quick index to the first opcode with a particular name in the opcode
 421      table.  */
 422   for (opcode = avr_opcodes; opcode->name; opcode++)
 423     hash_insert (avr_hash, opcode->name, (char *) opcode);
 424
 425   avr_mod_hash = hash_new ();
 426
 427   for (i = 0; i < sizeof (exp_mod) / sizeof (exp_mod[0]); ++i)
 428     hash_insert (avr_mod_hash, EXP_MOD_NAME (i), (void *) (i + 10));
 429
 430   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 431 }
 432
 433 /* Resolve STR as a constant expression and return the result.
 434    If result greater than MAX then error.  */
 435
 436 static unsigned int
 437 avr_get_constant (str, max)
 438      char *str;
 439      int max;
 440 {
 441   expressionS ex;
 442   str = skip_space (str);
 443   input_line_pointer = str;
 444   expression (&ex);
 445
 446   if (ex.X_op != O_constant)
 447     as_bad (_("constant value required"));
 448
 449   if (ex.X_add_number > max || ex.X_add_number < 0)
 450     as_bad (_("number must be less than %d"), max + 1);
 451
 452   return ex.X_add_number;
 453 }
 454
 455 /* Parse instruction operands.
 456    Return binary opcode.  */
 457
 458 static unsigned int
 459 avr_operands (opcode, line)
 460      struct avr_opcodes_s *opcode;
 461      char **line;
 462 {
 463   char *op = opcode->constraints;
 464   unsigned int bin = opcode->bin_opcode;
 465   char *frag = frag_more (opcode->insn_size * 2);
 466   char *str = *line;
 467   int where = frag - frag_now->fr_literal;
 468   static unsigned int prev = 0;  /* Previous opcode.  */
 469
 470   /* Opcode have operands.  */
 471   if (*op)
 472     {
 473       unsigned int reg1 = 0;
 474       unsigned int reg2 = 0;
 475       int reg1_present = 0;
 476       int reg2_present = 0;
 477
 478       /* Parse first operand.  */
 479       if (REGISTER_P (*op))
 480         reg1_present = 1;
 481       reg1 = avr_operand (opcode, where, op, &str);
 482       ++op;
 483
 484       /* Parse second operand.  */
 485       if (*op)
 486         {
 487           if (*op == ',')
 488             ++op;
 489
 490           if (*op == '=')
 491             {
 492               reg2 = reg1;
 493               reg2_present = 1;
 494             }
 495           else
 496             {
 497               if (REGISTER_P (*op))
 498                 reg2_present = 1;
 499
 500               str = skip_space (str);
 501               if (*str++ != ',')
 502                 as_bad (_("`,' required"));
 503               str = skip_space (str);
 504
 505               reg2 = avr_operand (opcode, where, op, &str);
 506
 507             }
 508
 509           if (reg1_present && reg2_present)
 510             reg2 = (reg2 & 0xf) | ((reg2 << 5) & 0x200);
 511           else if (reg2_present)
 512             reg2 <<= 4;
 513         }
 514       if (reg1_present)
 515         reg1 <<= 4;
 516       bin |= reg1 | reg2;
 517     }
 518
 519   /* Detect undefined combinations (like ld r31,Z+).  */
 520   if (!avr_opt.all_opcodes && AVR_UNDEF_P (bin))
 521     as_warn (_("undefined combination of operands"));
 522
 523   if (opcode->insn_size == 2)
 524     {
 525       /* Warn if the previous opcode was cpse/sbic/sbis/sbrc/sbrs
 526          (AVR core bug, fixed in the newer devices).  */
 527
 528       if (!(avr_opt.no_skip_bug || (avr_mcu->isa & AVR_ISA_MUL))
 529           && AVR_SKIP_P (prev))
 530         as_warn (_("skipping two-word instruction"));
 531
 532       bfd_putl32 ((bfd_vma) bin, frag);
 533     }
 534   else
 535     bfd_putl16 ((bfd_vma) bin, frag);
 536
 537   prev = bin;
 538   *line = str;
 539   return bin;
 540 }
 541
 542 /* Parse one instruction operand.
 543    Return operand bitmask.  Also fixups can be generated.  */
 544
 545 static unsigned int
 546 avr_operand (opcode, where, op, line)
 547      struct avr_opcodes_s *opcode;
 548      int where;
 549      char *op;
 550      char **line;
 551 {
 552   expressionS op_expr;
 553   unsigned int op_mask = 0;
 554   char *str = skip_space (*line);
 555
 556   switch (*op)
 557     {
 558       /* Any register operand.  */
 559     case 'w':
 560     case 'd':
 561     case 'r':
 562     case 'a':
 563     case 'v':
 564       if (*str == 'r' || *str == 'R')
 565         {
 566           char r_name[20];
 567
 568           str = extract_word (str, r_name, sizeof (r_name));
 569           op_mask = 0xff;
 570           if (ISDIGIT (r_name[1]))
 571             {
 572               if (r_name[2] == '\0')
 573                 op_mask = r_name[1] - '0';
 574               else if (r_name[1] != '0'
 575                        && ISDIGIT (r_name[2])
 576                        && r_name[3] == '\0')
 577                 op_mask = (r_name[1] - '0') * 10 + r_name[2] - '0';
 578             }
 579         }
 580       else
 581         {
 582           op_mask = avr_get_constant (str, 31);
 583           str = input_line_pointer;
 584         }
 585
 586       if (op_mask <= 31)
 587         {
 588           switch (*op)
 589             {
 590             case 'a':
 591               if (op_mask < 16 || op_mask > 23)
 592                 as_bad (_("register r16-r23 required"));
 593               op_mask -= 16;
 594               break;
 595
 596             case 'd':
 597               if (op_mask < 16)
 598                 as_bad (_("register number above 15 required"));
 599               op_mask -= 16;
 600               break;
 601
 602             case 'v':
 603               if (op_mask & 1)
 604                 as_bad (_("even register number required"));
 605               op_mask >>= 1;
 606               break;
 607
 608             case 'w':
 609               if ((op_mask & 1) || op_mask < 24)
 610                 as_bad (_("register r24, r26, r28 or r30 required"));
 611               op_mask = (op_mask - 24) >> 1;
 612               break;
 613             }
 614           break;
 615         }
 616       as_bad (_("register name or number from 0 to 31 required"));
 617       break;
 618
 619     case 'e':
 620       {
 621         char c;
 622
 623         if (*str == '-')
 624           {
 625             str = skip_space (str + 1);
 626             op_mask = 0x1002;
 627           }
 628         c = TOLOWER (*str);
 629         if (c == 'x')
 630           op_mask |= 0x100c;
 631         else if (c == 'y')
 632           op_mask |= 0x8;
 633         else if (c != 'z')
 634           as_bad (_("pointer register (X, Y or Z) required"));
 635
 636         str = skip_space (str + 1);
 637         if (*str == '+')
 638           {
 639             ++str;
 640             if (op_mask & 2)
 641               as_bad (_("cannot both predecrement and postincrement"));
 642             op_mask |= 0x1001;
 643           }
 644
 645         /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
 646            registers, no predecrement, no postincrement.  */
 647         if (!avr_opt.all_opcodes && (op_mask & 0x100F)
 648             && !(avr_mcu->isa & AVR_ISA_SRAM))
 649           as_bad (_("addressing mode not supported"));
 650       }
 651       break;
 652
 653     case 'z':
 654       if (*str == '-')
 655         as_bad (_("can't predecrement"));
 656
 657       if (! (*str == 'z' || *str == 'Z'))
 658         as_bad (_("pointer register Z required"));
 659
 660       str = skip_space (str + 1);
 661
 662       if (*str == '+')
 663         {
 664           ++str;
 665           op_mask |= 1;
 666         }
 667       break;
 668
 669     case 'b':
 670       {
 671         char c = TOLOWER (*str++);
 672
 673         if (c == 'y')
 674           op_mask |= 0x8;
 675         else if (c != 'z')
 676           as_bad (_("pointer register (Y or Z) required"));
 677         str = skip_space (str);
 678         if (*str++ == '+')
 679           {
 680             unsigned int x;
 681             x = avr_get_constant (str, 63);
 682             str = input_line_pointer;
 683             op_mask |= (x & 7) | ((x & (3 << 3)) << 7) | ((x & (1 << 5)) << 8);
 684           }
 685       }
 686       break;
 687
 688     case 'h':
 689       str = parse_exp (str, &op_expr);
 690       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 691                    &op_expr, false, BFD_RELOC_AVR_CALL);
 692       break;
 693
 694     case 'L':
 695       str = parse_exp (str, &op_expr);
 696       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 697                    &op_expr, true, BFD_RELOC_AVR_13_PCREL);
 698       break;
 699
 700     case 'l':
 701       str = parse_exp (str, &op_expr);
 702       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 703                    &op_expr, true, BFD_RELOC_AVR_7_PCREL);
 704       break;
 705
 706     case 'i':
 707       str = parse_exp (str, &op_expr);
 708       fix_new_exp (frag_now, where + 2, opcode->insn_size * 2,
 709                    &op_expr, false, BFD_RELOC_16);
 710       break;
 711
 712     case 'M':
 713       {
 714         bfd_reloc_code_real_type r_type;
 715
 716         input_line_pointer = str;
 717         r_type = avr_ldi_expression (&op_expr);
 718         str = input_line_pointer;
 719         fix_new_exp (frag_now, where, 3,
 720                      &op_expr, false, r_type);
 721       }
 722       break;
 723
 724     case 'n':
 725       {
 726         unsigned int x;
 727
 728         x = ~avr_get_constant (str, 255);
 729         str = input_line_pointer;
 730         op_mask |= (x & 0xf) | ((x << 4) & 0xf00);
 731       }
 732       break;
 733
 734     case 'K':
 735       {
 736         unsigned int x;
 737
 738         x = avr_get_constant (str, 63);
 739         str = input_line_pointer;
 740         op_mask |= (x & 0xf) | ((x & 0x30) << 2);
 741       }
 742       break;
 743
 744     case 'S':
 745     case 's':
 746       {
 747         unsigned int x;
 748
 749         x = avr_get_constant (str, 7);
 750         str = input_line_pointer;
 751         if (*op == 'S')
 752           x <<= 4;
 753         op_mask |= x;
 754       }
 755       break;
 756
 757     case 'P':
 758       {
 759         unsigned int x;
 760
 761         x = avr_get_constant (str, 63);
 762         str = input_line_pointer;
 763         op_mask |= (x & 0xf) | ((x & 0x30) << 5);
 764       }
 765       break;
 766
 767     case 'p':
 768       {
 769         unsigned int x;
 770
 771         x = avr_get_constant (str, 31);
 772         str = input_line_pointer;
 773         op_mask |= x << 3;
 774       }
 775       break;
 776
 777     case '?':
 778       break;
 779
 780     default:
 781       as_bad (_("unknown constraint `%c'"), *op);
 782     }
 783
 784   *line = str;
 785   return op_mask;
 786 }
 787
 788 /* GAS will call this function for each section at the end of the assembly,
 789    to permit the CPU backend to adjust the alignment of a section.  */
 790
 791 valueT
 792 md_section_align (seg, addr)
 793      asection *seg;
 794      valueT addr;
 795 {
 796   int align = bfd_get_section_alignment (stdoutput, seg);
 797   return ((addr + (1 << align) - 1) & (-1 << align));
 798 }
 799
 800 /* If you define this macro, it should return the offset between the
 801    address of a PC relative fixup and the position from which the PC
 802    relative adjustment should be made.  On many processors, the base
 803    of a PC relative instruction is the next instruction, so this
 804    macro would return the length of an instruction.  */
 805
 806 long
 807 md_pcrel_from_section (fixp, sec)
 808      fixS *fixp;
 809      segT sec;
 810 {
 811   if (fixp->fx_addsy != (symbolS *) NULL
 812       && (!S_IS_DEFINED (fixp->fx_addsy)
 813           || (S_GET_SEGMENT (fixp->fx_addsy) != sec)))
 814     return 0;
 815
 816   return fixp->fx_frag->fr_address + fixp->fx_where;
 817 }
 818
 819 /* GAS will call this for each fixup.  It should store the correct
 820    value in the object file.  */
 821
 822 void
 823 md_apply_fix3 (fixP, valP, seg)
 824      fixS *fixP;
 825      valueT * valP;
 826      segT seg;
 827 {
 828   unsigned char *where;
 829   unsigned long insn;
 830   long value = * (long *) valP;
 831
 832   if (fixP->fx_addsy == (symbolS *) NULL)
 833     fixP->fx_done = 1;
 834
 835   else if (fixP->fx_pcrel)
 836     {
 837       segT s = S_GET_SEGMENT (fixP->fx_addsy);
 838
 839       if (fixP->fx_addsy && (s == seg || s == absolute_section))
 840         {
 841           value = S_GET_VALUE (fixP->fx_addsy) + *valuep;
 842           fixP->fx_done = 1;
 843         }
 844     }
 845   else
 846     {
 847       value = fixP->fx_offset;
 848
 849       if (fixP->fx_subsy != (symbolS *) NULL)
 850         {
 851           if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section)
 852             {
 853               value -= S_GET_VALUE (fixP->fx_subsy);
 854               fixP->fx_done = 1;
 855             }
 856           else
 857             {
 858               /* We don't actually support subtracting a symbol.  */
 859               as_bad_where (fixP->fx_file, fixP->fx_line,
 860                             _("expression too complex"));
 861             }
 862         }
 863     }
 864
 865   switch (fixP->fx_r_type)
 866     {
 867     default:
 868       fixP->fx_no_overflow = 1;
 869       break;
 870     case BFD_RELOC_AVR_7_PCREL:
 871     case BFD_RELOC_AVR_13_PCREL:
 872     case BFD_RELOC_32:
 873     case BFD_RELOC_16:
 874     case BFD_RELOC_AVR_CALL:
 875       break;
 876     }
 877
 878   if (fixP->fx_done)
 879     {
 880       /* Fetch the instruction, insert the fully resolved operand
 881          value, and stuff the instruction back again.  */
 882       where = fixP->fx_frag->fr_literal + fixP->fx_where;
 883       insn = bfd_getl16 (where);
 884
 885       switch (fixP->fx_r_type)
 886         {
 887         case BFD_RELOC_AVR_7_PCREL:
 888           if (value & 1)
 889             as_bad_where (fixP->fx_file, fixP->fx_line,
 890                           _("odd address operand: %ld"), value);
 891
 892           /* Instruction addresses are always right-shifted by 1.  */
 893           value >>= 1;
 894           --value;                      /* Correct PC.  */
 895
 896           if (value < -64 || value > 63)
 897             as_bad_where (fixP->fx_file, fixP->fx_line,
 898                           _("operand out of range: %ld"), value);
 899           value = (value << 3) & 0x3f8;
 900           bfd_putl16 ((bfd_vma) (value | insn), where);
 901           break;
 902
 903         case BFD_RELOC_AVR_13_PCREL:
 904           if (value & 1)
 905             as_bad_where (fixP->fx_file, fixP->fx_line,
 906                           _("odd address operand: %ld"), value);
 907
 908           /* Instruction addresses are always right-shifted by 1.  */
 909           value >>= 1;
 910           --value;                      /* Correct PC.  */
 911
 912           if (value < -2048 || value > 2047)
 913             {
 914               /* No wrap for devices with >8K of program memory.  */
 915               if ((avr_mcu->isa & AVR_ISA_MEGA) || avr_opt.no_wrap)
 916                 as_bad_where (fixP->fx_file, fixP->fx_line,
 917                               _("operand out of range: %ld"), value);
 918             }
 919
 920           value &= 0xfff;
 921           bfd_putl16 ((bfd_vma) (value | insn), where);
 922           break;
 923
 924         case BFD_RELOC_32:
 925           bfd_putl16 ((bfd_vma) value, where);
 926           break;
 927
 928         case BFD_RELOC_16:
 929           bfd_putl16 ((bfd_vma) value, where);
 930           break;
 931
 932         case BFD_RELOC_AVR_16_PM:
 933           bfd_putl16 ((bfd_vma) (value >> 1), where);
 934           break;
 935
 936         case BFD_RELOC_AVR_LO8_LDI:
 937           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value), where);
 938           break;
 939
 940         case -BFD_RELOC_AVR_LO8_LDI:
 941           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 16), where);
 942           break;
 943
 944         case BFD_RELOC_AVR_HI8_LDI:
 945           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 8), where);
 946           break;
 947
 948         case -BFD_RELOC_AVR_HI8_LDI:
 949           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 24), where);
 950           break;
 951
 952         case BFD_RELOC_AVR_HH8_LDI:
 953           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 16), where);
 954           break;
 955
 956         case BFD_RELOC_AVR_LO8_LDI_NEG:
 957           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value), where);
 958           break;
 959
 960         case -BFD_RELOC_AVR_LO8_LDI_NEG:
 961           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 16), where);
 962           break;
 963
 964         case BFD_RELOC_AVR_HI8_LDI_NEG:
 965           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 8), where);
 966           break;
 967
 968         case -BFD_RELOC_AVR_HI8_LDI_NEG:
 969           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 24), where);
 970           break;
 971
 972         case BFD_RELOC_AVR_HH8_LDI_NEG:
 973           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 16), where);
 974           break;
 975
 976         case BFD_RELOC_AVR_LO8_LDI_PM:
 977           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 1), where);
 978           break;
 979
 980         case BFD_RELOC_AVR_HI8_LDI_PM:
 981           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 9), where);
 982           break;
 983
 984         case BFD_RELOC_AVR_HH8_LDI_PM:
 985           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 17), where);
 986           break;
 987
 988         case BFD_RELOC_AVR_LO8_LDI_PM_NEG:
 989           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 1), where);
 990           break;
 991
 992         case BFD_RELOC_AVR_HI8_LDI_PM_NEG:
 993           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 9), where);
 994           break;
 995
 996         case BFD_RELOC_AVR_HH8_LDI_PM_NEG:
 997           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 17), where);
 998           break;
 999
1000         case BFD_RELOC_AVR_CALL:
1001           {
1002             unsigned long x;
1003
1004             x = bfd_getl16 (where);
1005             if (value & 1)
1006               as_bad_where (fixP->fx_file, fixP->fx_line,
1007                             _("odd address operand: %ld"), value);
1008             value >>= 1;
1009             x |= ((value & 0x10000) | ((value << 3) & 0x1f00000)) >> 16;
1010             bfd_putl16 ((bfd_vma) x, where);
1011             bfd_putl16 ((bfd_vma) (value & 0xffff), where + 2);
1012           }
1013           break;
1014
1015         default:
1016           as_fatal (_("line %d: unknown relocation type: 0x%x"),
1017                     fixP->fx_line, fixP->fx_r_type);
1018           break;
1019         }
1020     }
1021   else
1022     {
1023       switch (fixP->fx_r_type)
1024         {
1025         case -BFD_RELOC_AVR_HI8_LDI_NEG:
1026         case -BFD_RELOC_AVR_HI8_LDI:
1027         case -BFD_RELOC_AVR_LO8_LDI_NEG:
1028         case -BFD_RELOC_AVR_LO8_LDI:
1029           as_bad_where (fixP->fx_file, fixP->fx_line,
1030                         _("only constant expression allowed"));
1031           fixP->fx_done = 1;
1032           break;
1033         default:
1034           break;
1035         }
1036       fixP->fx_addnumber = value;
1037     }
1038 }
1039
1040 /* A `BFD_ASSEMBLER' GAS will call this to generate a reloc.  GAS
1041    will pass the resulting reloc to `bfd_install_relocation'.  This
1042    currently works poorly, as `bfd_install_relocation' often does the
1043    wrong thing, and instances of `tc_gen_reloc' have been written to
1044    work around the problems, which in turns makes it difficult to fix
1045    `bfd_install_relocation'.  */
1046
1047 /* If while processing a fixup, a reloc really needs to be created
1048    then it is done here.  */
1049
1050 arelent *
1051 tc_gen_reloc (seg, fixp)
1052      asection *seg ATTRIBUTE_UNUSED;
1053      fixS *fixp;
1054 {
1055   arelent *reloc;
1056
1057   reloc = (arelent *) xmalloc (sizeof (arelent));
1058
1059   reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
1060   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1061
1062   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1063   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
1064   if (reloc->howto == (reloc_howto_type *) NULL)
1065     {
1066       as_bad_where (fixp->fx_file, fixp->fx_line,
1067                     _("reloc %d not supported by object file format"),
1068                     (int) fixp->fx_r_type);
1069       return NULL;
1070     }
1071
1072   if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
1073       || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
1074     reloc->address = fixp->fx_offset;
1075
1076   reloc->addend = fixp->fx_offset;
1077
1078   return reloc;
1079 }
1080
1081 void
1082 md_assemble (str)
1083      char *str;
1084 {
1085   struct avr_opcodes_s *opcode;
1086   char op[11];
1087
1088   str = skip_space (extract_word (str, op, sizeof (op)));
1089
1090   if (!op[0])
1091     as_bad (_("can't find opcode "));
1092
1093   opcode = (struct avr_opcodes_s *) hash_find (avr_hash, op);
1094
1095   if (opcode == NULL)
1096     {
1097       as_bad (_("unknown opcode `%s'"), op);
1098       return;
1099     }
1100
1101   /* Special case for opcodes with optional operands (lpm, elpm) -
1102      version with operands exists in avr_opcodes[] in the next entry.  */
1103
1104   if (*str && *opcode->constraints == '?')
1105     ++opcode;
1106
1107   if (!avr_opt.all_opcodes && (opcode->isa & avr_mcu->isa) != opcode->isa)
1108     as_bad (_("illegal opcode %s for mcu %s"), opcode->name, avr_mcu->name);
1109
1110   /* We used to set input_line_pointer to the result of get_operands,
1111      but that is wrong.  Our caller assumes we don't change it.  */
1112   {
1113     char *t = input_line_pointer;
1114     avr_operands (opcode, &str);
1115     if (*skip_space (str))
1116       as_bad (_("garbage at end of line"));
1117     input_line_pointer = t;
1118   }
1119 }
1120
1121 /* Parse ordinary expression.  */
1122
1123 static char *
1124 parse_exp (s, op)
1125      char *s;
1126      expressionS *op;
1127 {
1128   input_line_pointer = s;
1129   expression (op);
1130   if (op->X_op == O_absent)
1131     as_bad (_("missing operand"));
1132   return input_line_pointer;
1133 }
1134
1135 /* Parse special expressions (needed for LDI command):
1136    xx8 (address)
1137    xx8 (-address)
1138    pm_xx8 (address)
1139    pm_xx8 (-address)
1140    where xx is: hh, hi, lo.  */
1141
1142 static bfd_reloc_code_real_type
1143 avr_ldi_expression (exp)
1144      expressionS *exp;
1145 {
1146   char *str = input_line_pointer;
1147   char *tmp;
1148   char op[8];
1149   int mod;
1150   tmp = str;
1151
1152   str = extract_word (str, op, sizeof (op));
1153
1154   if (op[0])
1155     {
1156       mod = (int) hash_find (avr_mod_hash, op);
1157
1158       if (mod)
1159         {
1160           int closes = 0;
1161
1162           mod -= 10;
1163           str = skip_space (str);
1164
1165           if (*str == '(')
1166             {
1167               int neg_p = 0;
1168
1169               ++str;
1170
1171               if (strncmp ("pm(", str, 3) == 0
1172                   || strncmp ("-(pm(", str, 5) == 0)
1173                 {
1174                   if (HAVE_PM_P (mod))
1175                     {
1176                       ++mod;
1177                       ++closes;
1178                     }
1179                   else
1180                     as_bad (_("illegal expression"));
1181
1182                   if (*str == '-')
1183                     {
1184                       neg_p = 1;
1185                       ++closes;
1186                       str += 5;
1187                     }
1188                   else
1189                     str += 3;
1190                 }
1191
1192               if (*str == '-' && *(str + 1) == '(')
1193                 {
1194                   neg_p ^= 1;
1195                   ++closes;
1196                   str += 2;
1197                 }
1198
1199               input_line_pointer = str;
1200               expression (exp);
1201
1202               do
1203                 {
1204                   if (*input_line_pointer != ')')
1205                     {
1206                       as_bad (_("`)' required"));
1207                       break;
1208                     }
1209                   input_line_pointer++;
1210                 }
1211               while (closes--);
1212
1213               return neg_p ? EXP_MOD_NEG_RELOC (mod) : EXP_MOD_RELOC (mod);
1214             }
1215         }
1216     }
1217
1218   input_line_pointer = tmp;
1219   expression (exp);
1220
1221   /* Warn about expressions that fail to use lo8 ().  */
1222   if (exp->X_op == O_constant)
1223     {
1224       int x = exp->X_add_number;
1225       if (x < -255 || x > 255)
1226         as_warn (_("constant out of 8-bit range: %d"), x);
1227     }
1228   else
1229     as_warn (_("expression possibly out of 8-bit range"));
1230
1231   return BFD_RELOC_AVR_LO8_LDI;
1232 }
1233
1234 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1235    `avr_cons_fix_new'.  */
1236 static int exp_mod_pm = 0;
1237
1238 /* Parse special CONS expression: pm (expression)
1239    which is used for addressing to a program memory.
1240    Relocation: BFD_RELOC_AVR_16_PM.  */
1241
1242 void
1243 avr_parse_cons_expression (exp, nbytes)
1244      expressionS *exp;
1245      int nbytes;
1246 {
1247   char *tmp;
1248
1249   exp_mod_pm = 0;
1250
1251   tmp = input_line_pointer = skip_space (input_line_pointer);
1252
1253   if (nbytes == 2)
1254     {
1255       char *pm_name = "pm";
1256       int len = strlen (pm_name);
1257
1258       if (strncasecmp (input_line_pointer, pm_name, len) == 0)
1259         {
1260           input_line_pointer = skip_space (input_line_pointer + len);
1261
1262           if (*input_line_pointer == '(')
1263             {
1264               input_line_pointer = skip_space (input_line_pointer + 1);
1265               exp_mod_pm = 1;
1266               expression (exp);
1267
1268               if (*input_line_pointer == ')')
1269                 ++input_line_pointer;
1270               else
1271                 {
1272                   as_bad (_("`)' required"));
1273                   exp_mod_pm = 0;
1274                 }
1275
1276               return;
1277             }
1278
1279           input_line_pointer = tmp;
1280         }
1281     }
1282
1283   expression (exp);
1284 }
1285
1286 void
1287 avr_cons_fix_new (frag, where, nbytes, exp)
1288      fragS *frag;
1289      int where;
1290      int nbytes;
1291      expressionS *exp;
1292 {
1293   if (exp_mod_pm == 0)
1294     {
1295       if (nbytes == 2)
1296         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_16);
1297       else if (nbytes == 4)
1298         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_32);
1299       else
1300         as_bad (_("illegal %srelocation size: %d"), "", nbytes);
1301     }
1302   else
1303     {
1304       if (nbytes == 2)
1305         fix_new_exp (frag, where, nbytes, exp, false, BFD_RELOC_AVR_16_PM);
1306       else
1307         as_bad (_("illegal %srelocation size: %d"), "`pm' ", nbytes);
1308       exp_mod_pm = 0;
1309     }
1310 }