gas/config/tc-avr.c

   1 /* tc-avr.c -- Assembler code for the ATMEL AVR
   2
   3    Copyright 1999, 2000, 2001, 2002, 2004, 2005, 2006
   4    Free Software Foundation, Inc.
   5    Contributed by Denis Chertykov <denisc@overta.ru>
   6
   7    This file is part of GAS, the GNU Assembler.
   8
   9    GAS is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GAS is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GAS; see the file COPYING.  If not, write to
  21    the Free Software Foundation, 51 Franklin Street - Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #include <stdio.h>
  25 #include "as.h"
  26 #include "safe-ctype.h"
  27 #include "subsegs.h"
  28 #include "libiberty.h"
  29
  30 struct avr_opcodes_s
  31 {
  32   char *        name;
  33   char *        constraints;
  34   int           insn_size;              /* In words.  */
  35   int           isa;
  36   unsigned int  bin_opcode;
  37 };
  38
  39 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
  40 {#NAME, CONSTR, SIZE, ISA, BIN},
  41
  42 struct avr_opcodes_s avr_opcodes[] =
  43 {
  44   #include "opcode/avr.h"
  45   {NULL, NULL, 0, 0, 0}
  46 };
  47
  48 const char comment_chars[] = ";";
  49 const char line_comment_chars[] = "#";
  50 const char line_separator_chars[] = "$";
  51
  52 const char *md_shortopts = "m:";
  53 struct mcu_type_s
  54 {
  55   char *name;
  56   int isa;
  57   int mach;
  58 };
  59
  60 /* XXX - devices that don't seem to exist (renamed, replaced with larger
  61    ones, or planned but never produced), left here for compatibility.
  62    TODO: hide them in show_mcu_list output?  */
  63
  64 static struct mcu_type_s mcu_types[] =
  65 {
  66   {"avr1",      AVR_ISA_TINY1,    bfd_mach_avr1},
  67   {"avr2",      AVR_ISA_TINY2,    bfd_mach_avr2},
  68   {"avr3",      AVR_ISA_M103,     bfd_mach_avr3},
  69   {"avr4",      AVR_ISA_M8,       bfd_mach_avr4},
  70   {"avr5",      AVR_ISA_ALL,      bfd_mach_avr5},
  71   {"at90s1200", AVR_ISA_1200,     bfd_mach_avr1},
  72   {"attiny10",  AVR_ISA_TINY1,    bfd_mach_avr1}, /* XXX -> tn11 */
  73   {"attiny11",  AVR_ISA_TINY1,    bfd_mach_avr1},
  74   {"attiny12",  AVR_ISA_TINY1,    bfd_mach_avr1},
  75   {"attiny15",  AVR_ISA_TINY1,    bfd_mach_avr1},
  76   {"attiny28",  AVR_ISA_TINY1,    bfd_mach_avr1},
  77   {"at90s2313", AVR_ISA_2xxx,     bfd_mach_avr2},
  78   {"at90s2323", AVR_ISA_2xxx,     bfd_mach_avr2},
  79   {"at90s2333", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 4433 */
  80   {"at90s2343", AVR_ISA_2xxx,     bfd_mach_avr2},
  81   {"attiny22",  AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 2343 */
  82   {"attiny26",  AVR_ISA_2xxx,     bfd_mach_avr2},
  83   {"at90s4433", AVR_ISA_2xxx,     bfd_mach_avr2},
  84   {"at90s4414", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 8515 */
  85   {"at90s4434", AVR_ISA_2xxx,     bfd_mach_avr2}, /* XXX -> 8535 */
  86   {"at90s8515", AVR_ISA_2xxx,     bfd_mach_avr2},
  87   {"at90s8535", AVR_ISA_2xxx,     bfd_mach_avr2},
  88   {"at90c8534", AVR_ISA_2xxx,     bfd_mach_avr2},
  89   {"at86rf401", AVR_ISA_2xxx,     bfd_mach_avr2},
  90   {"attiny13",  AVR_ISA_TINY2,    bfd_mach_avr2},
  91   {"attiny2313",AVR_ISA_TINY2,    bfd_mach_avr2},
  92   {"attiny261", AVR_ISA_TINY2,    bfd_mach_avr2},
  93   {"attiny461", AVR_ISA_TINY2,    bfd_mach_avr2},
  94   {"attiny861", AVR_ISA_TINY2,    bfd_mach_avr2},
  95   {"attiny24",  AVR_ISA_TINY2,    bfd_mach_avr2},
  96   {"attiny44",  AVR_ISA_TINY2,    bfd_mach_avr2},
  97   {"attiny84",  AVR_ISA_TINY2,    bfd_mach_avr2},
  98   {"attiny25",  AVR_ISA_TINY2,    bfd_mach_avr2},
  99   {"attiny45",  AVR_ISA_TINY2,    bfd_mach_avr2},
 100   {"attiny85",  AVR_ISA_TINY2,    bfd_mach_avr2},
 101   {"atmega603", AVR_ISA_M603,     bfd_mach_avr3}, /* XXX -> m103 */
 102   {"atmega103", AVR_ISA_M103,     bfd_mach_avr3},
 103   {"at43usb320",AVR_ISA_M103,     bfd_mach_avr3},
 104   {"at43usb355",AVR_ISA_M603,     bfd_mach_avr3},
 105   {"at76c711",  AVR_ISA_M603,     bfd_mach_avr3},
 106   {"atmega48",  AVR_ISA_PWMx,     bfd_mach_avr4},
 107   {"atmega8",   AVR_ISA_M8,       bfd_mach_avr4},
 108   {"atmega83",  AVR_ISA_M8,       bfd_mach_avr4}, /* XXX -> m8535 */
 109   {"atmega85",  AVR_ISA_M8,       bfd_mach_avr4}, /* XXX -> m8 */
 110   {"atmega88",  AVR_ISA_PWMx,     bfd_mach_avr4},
 111   {"atmega8515",AVR_ISA_M8,       bfd_mach_avr4},
 112   {"atmega8535",AVR_ISA_M8,       bfd_mach_avr4},
 113   {"at90pwm2",  AVR_ISA_PWMx,     bfd_mach_avr4},
 114   {"at90pwm3",  AVR_ISA_PWMx,     bfd_mach_avr4},
 115   {"atmega16",  AVR_ISA_M323,     bfd_mach_avr5},
 116   {"atmega161", AVR_ISA_M161,     bfd_mach_avr5},
 117   {"atmega162", AVR_ISA_M323,     bfd_mach_avr5},
 118   {"atmega163", AVR_ISA_M161,     bfd_mach_avr5},
 119   {"atmega164", AVR_ISA_M323,     bfd_mach_avr5},
 120   {"atmega165", AVR_ISA_M323,     bfd_mach_avr5},
 121   {"atmega168", AVR_ISA_M323,     bfd_mach_avr5},
 122   {"atmega169", AVR_ISA_M323,     bfd_mach_avr5},
 123   {"atmega32",  AVR_ISA_M323,     bfd_mach_avr5},
 124   {"atmega323", AVR_ISA_M323,     bfd_mach_avr5},
 125   {"atmega324", AVR_ISA_M323,     bfd_mach_avr5},
 126   {"atmega325", AVR_ISA_M323,     bfd_mach_avr5},
 127   {"atmega329", AVR_ISA_M323,     bfd_mach_avr5},
 128   {"atmega3250",AVR_ISA_M323,     bfd_mach_avr5},
 129   {"atmega3290",AVR_ISA_M323,     bfd_mach_avr5},
 130   {"atmega406", AVR_ISA_M323,     bfd_mach_avr5},
 131   {"atmega64",  AVR_ISA_M323,     bfd_mach_avr5},
 132   {"atmega640", AVR_ISA_M323,     bfd_mach_avr5},
 133   {"atmega644", AVR_ISA_M323,     bfd_mach_avr5},
 134   {"atmega128", AVR_ISA_M128,     bfd_mach_avr5},
 135   {"atmega1280",AVR_ISA_M128,     bfd_mach_avr5},
 136   {"atmega1281",AVR_ISA_M128,     bfd_mach_avr5},
 137   {"atmega645", AVR_ISA_M323,     bfd_mach_avr5},
 138   {"atmega649", AVR_ISA_M323,     bfd_mach_avr5},
 139   {"atmega6450",AVR_ISA_M323,     bfd_mach_avr5},
 140   {"atmega6490",AVR_ISA_M323,     bfd_mach_avr5},
 141   {"at90can32" ,AVR_ISA_M323,     bfd_mach_avr5},
 142   {"at90can64" ,AVR_ISA_M323,     bfd_mach_avr5},
 143   {"at90can128",AVR_ISA_M128,     bfd_mach_avr5},
 144   {"at90usb646", AVR_ISA_M323,    bfd_mach_avr5},
 145   {"at90usb647", AVR_ISA_M323,    bfd_mach_avr5},
 146   {"at90usb1286",AVR_ISA_M128,    bfd_mach_avr5},
 147   {"at90usb1287",AVR_ISA_M128,    bfd_mach_avr5},
 148   {"at94k",     AVR_ISA_94K,      bfd_mach_avr5},
 149   {NULL, 0, 0}
 150 };
 151
 152 /* Current MCU type.  */
 153 static struct mcu_type_s   default_mcu = {"avr2", AVR_ISA_2xxx,bfd_mach_avr2};
 154 static struct mcu_type_s * avr_mcu = & default_mcu;
 155
 156 /* AVR target-specific switches.  */
 157 struct avr_opt_s
 158 {
 159   int all_opcodes;  /* -mall-opcodes: accept all known AVR opcodes.  */
 160   int no_skip_bug;  /* -mno-skip-bug: no warnings for skipping 2-word insns.  */
 161   int no_wrap;      /* -mno-wrap: reject rjmp/rcall with 8K wrap-around.  */
 162 };
 163
 164 static struct avr_opt_s avr_opt = { 0, 0, 0 };
 165
 166 const char EXP_CHARS[] = "eE";
 167 const char FLT_CHARS[] = "dD";
 168
 169 static void avr_set_arch (int);
 170
 171 /* The target specific pseudo-ops which we support.  */
 172 const pseudo_typeS md_pseudo_table[] =
 173 {
 174   {"arch", avr_set_arch,        0},
 175   { NULL,       NULL,           0}
 176 };
 177
 178 #define LDI_IMMEDIATE(x) (((x) & 0xf) | (((x) << 4) & 0xf00))
 179
 180 #define EXP_MOD_NAME(i)       exp_mod[i].name
 181 #define EXP_MOD_RELOC(i)      exp_mod[i].reloc
 182 #define EXP_MOD_NEG_RELOC(i)  exp_mod[i].neg_reloc
 183 #define HAVE_PM_P(i)          exp_mod[i].have_pm
 184
 185 struct exp_mod_s
 186 {
 187   char *                    name;
 188   bfd_reloc_code_real_type  reloc;
 189   bfd_reloc_code_real_type  neg_reloc;
 190   int                       have_pm;
 191 };
 192
 193 static struct exp_mod_s exp_mod[] =
 194 {
 195   {"hh8",    BFD_RELOC_AVR_HH8_LDI,    BFD_RELOC_AVR_HH8_LDI_NEG,    1},
 196   {"pm_hh8", BFD_RELOC_AVR_HH8_LDI_PM, BFD_RELOC_AVR_HH8_LDI_PM_NEG, 0},
 197   {"hi8",    BFD_RELOC_AVR_HI8_LDI,    BFD_RELOC_AVR_HI8_LDI_NEG,    1},
 198   {"pm_hi8", BFD_RELOC_AVR_HI8_LDI_PM, BFD_RELOC_AVR_HI8_LDI_PM_NEG, 0},
 199   {"lo8",    BFD_RELOC_AVR_LO8_LDI,    BFD_RELOC_AVR_LO8_LDI_NEG,    1},
 200   {"pm_lo8", BFD_RELOC_AVR_LO8_LDI_PM, BFD_RELOC_AVR_LO8_LDI_PM_NEG, 0},
 201   {"hlo8",   BFD_RELOC_AVR_HH8_LDI,    BFD_RELOC_AVR_HH8_LDI_NEG,    0},
 202   {"hhi8",   BFD_RELOC_AVR_MS8_LDI,    BFD_RELOC_AVR_MS8_LDI_NEG,    0},
 203 };
 204
 205 /* A union used to store indicies into the exp_mod[] array
 206    in a hash table which expects void * data types.  */
 207 typedef union
 208 {
 209   void * ptr;
 210   int    index;
 211 } mod_index;
 212
 213 /* Opcode hash table.  */
 214 static struct hash_control *avr_hash;
 215
 216 /* Reloc modifiers hash control (hh8,hi8,lo8,pm_xx).  */
 217 static struct hash_control *avr_mod_hash;
 218
 219 #define OPTION_MMCU 'm'
 220 enum options
 221 {
 222   OPTION_ALL_OPCODES = OPTION_MD_BASE + 1,
 223   OPTION_NO_SKIP_BUG,
 224   OPTION_NO_WRAP
 225 };
 226
 227 struct option md_longopts[] =
 228 {
 229   { "mmcu",   required_argument, NULL, OPTION_MMCU        },
 230   { "mall-opcodes", no_argument, NULL, OPTION_ALL_OPCODES },
 231   { "mno-skip-bug", no_argument, NULL, OPTION_NO_SKIP_BUG },
 232   { "mno-wrap",     no_argument, NULL, OPTION_NO_WRAP     },
 233   { NULL, no_argument, NULL, 0 }
 234 };
 235
 236 size_t md_longopts_size = sizeof (md_longopts);
 237
 238 /* Display nicely formatted list of known MCU names.  */
 239
 240 static void
 241 show_mcu_list (FILE *stream)
 242 {
 243   int i, x;
 244
 245   fprintf (stream, _("Known MCU names:"));
 246   x = 1000;
 247
 248   for (i = 0; mcu_types[i].name; i++)
 249     {
 250       int len = strlen (mcu_types[i].name);
 251
 252       x += len + 1;
 253
 254       if (x < 75)
 255         fprintf (stream, " %s", mcu_types[i].name);
 256       else
 257         {
 258           fprintf (stream, "\n  %s", mcu_types[i].name);
 259           x = len + 2;
 260         }
 261     }
 262
 263   fprintf (stream, "\n");
 264 }
 265
 266 static inline char *
 267 skip_space (char *s)
 268 {
 269   while (*s == ' ' || *s == '\t')
 270     ++s;
 271   return s;
 272 }
 273
 274 /* Extract one word from FROM and copy it to TO.  */
 275
 276 static char *
 277 extract_word (char *from, char *to, int limit)
 278 {
 279   char *op_start;
 280   char *op_end;
 281   int size = 0;
 282
 283   /* Drop leading whitespace.  */
 284   from = skip_space (from);
 285   *to = 0;
 286
 287   /* Find the op code end.  */
 288   for (op_start = op_end = from; *op_end != 0 && is_part_of_name (*op_end);)
 289     {
 290       to[size++] = *op_end++;
 291       if (size + 1 >= limit)
 292         break;
 293     }
 294
 295   to[size] = 0;
 296   return op_end;
 297 }
 298
 299 int
 300 md_estimate_size_before_relax (fragS *fragp ATTRIBUTE_UNUSED,
 301                                asection *seg ATTRIBUTE_UNUSED)
 302 {
 303   abort ();
 304   return 0;
 305 }
 306
 307 void
 308 md_show_usage (FILE *stream)
 309 {
 310   fprintf (stream,
 311       _("AVR options:\n"
 312         "  -mmcu=[avr-name] select microcontroller variant\n"
 313         "                   [avr-name] can be:\n"
 314         "                   avr1 - AT90S1200, ATtiny1x, ATtiny28\n"
 315         "                   avr2 - AT90S2xxx, AT90S4xxx, AT90S8xxx, ATtiny22\n"
 316         "                   avr3 - ATmega103, ATmega603\n"
 317         "                   avr4 - ATmega83, ATmega85\n"
 318         "                   avr5 - ATmega161, ATmega163, ATmega32, AT94K\n"
 319         "                   or immediate microcontroller name.\n"));
 320   fprintf (stream,
 321       _("  -mall-opcodes    accept all AVR opcodes, even if not supported by MCU\n"
 322         "  -mno-skip-bug    disable warnings for skipping two-word instructions\n"
 323         "                   (default for avr4, avr5)\n"
 324         "  -mno-wrap        reject rjmp/rcall instructions with 8K wrap-around\n"
 325         "                   (default for avr3, avr5)\n"));
 326   show_mcu_list (stream);
 327 }
 328
 329 static void
 330 avr_set_arch (int dummy ATTRIBUTE_UNUSED)
 331 {
 332   char str[20];
 333
 334   input_line_pointer = extract_word (input_line_pointer, str, 20);
 335   md_parse_option (OPTION_MMCU, str);
 336   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 337 }
 338
 339 int
 340 md_parse_option (int c, char *arg)
 341 {
 342   switch (c)
 343     {
 344     case OPTION_MMCU:
 345       {
 346         int i;
 347         char *s = alloca (strlen (arg) + 1);
 348
 349         {
 350           char *t = s;
 351           char *arg1 = arg;
 352
 353           do
 354             *t = TOLOWER (*arg1++);
 355           while (*t++);
 356         }
 357
 358         for (i = 0; mcu_types[i].name; ++i)
 359           if (strcmp (mcu_types[i].name, s) == 0)
 360             break;
 361
 362         if (!mcu_types[i].name)
 363           {
 364             show_mcu_list (stderr);
 365             as_fatal (_("unknown MCU: %s\n"), arg);
 366           }
 367
 368         /* It is OK to redefine mcu type within the same avr[1-5] bfd machine
 369            type - this for allows passing -mmcu=... via gcc ASM_SPEC as well
 370            as .arch ... in the asm output at the same time.  */
 371         if (avr_mcu == &default_mcu || avr_mcu->mach == mcu_types[i].mach)
 372           avr_mcu = &mcu_types[i];
 373         else
 374           as_fatal (_("redefinition of mcu type `%s' to `%s'"),
 375                     avr_mcu->name, mcu_types[i].name);
 376         return 1;
 377       }
 378     case OPTION_ALL_OPCODES:
 379       avr_opt.all_opcodes = 1;
 380       return 1;
 381     case OPTION_NO_SKIP_BUG:
 382       avr_opt.no_skip_bug = 1;
 383       return 1;
 384     case OPTION_NO_WRAP:
 385       avr_opt.no_wrap = 1;
 386       return 1;
 387     }
 388
 389   return 0;
 390 }
 391
 392 symbolS *
 393 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 394 {
 395   return NULL;
 396 }
 397
 398 /* Turn a string in input_line_pointer into a floating point constant
 399    of type TYPE, and store the appropriate bytes in *LITP.  The number
 400    of LITTLENUMS emitted is stored in *SIZEP.  An error message is
 401    returned, or NULL on OK.  */
 402
 403 char *
 404 md_atof (int type, char *litP, int *sizeP)
 405 {
 406   int prec;
 407   LITTLENUM_TYPE words[4];
 408   LITTLENUM_TYPE *wordP;
 409   char *t;
 410
 411   switch (type)
 412     {
 413     case 'f':
 414       prec = 2;
 415       break;
 416     case 'd':
 417       prec = 4;
 418       break;
 419     default:
 420       *sizeP = 0;
 421       return _("bad call to md_atof");
 422     }
 423
 424   t = atof_ieee (input_line_pointer, type, words);
 425   if (t)
 426     input_line_pointer = t;
 427
 428   *sizeP = prec * sizeof (LITTLENUM_TYPE);
 429
 430   /* This loop outputs the LITTLENUMs in REVERSE order.  */
 431   for (wordP = words + prec - 1; prec--;)
 432     {
 433       md_number_to_chars (litP, (valueT) (*wordP--), sizeof (LITTLENUM_TYPE));
 434       litP += sizeof (LITTLENUM_TYPE);
 435     }
 436
 437   return NULL;
 438 }
 439
 440 void
 441 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
 442                  asection *sec ATTRIBUTE_UNUSED,
 443                  fragS *fragP ATTRIBUTE_UNUSED)
 444 {
 445   abort ();
 446 }
 447
 448 void
 449 md_begin (void)
 450 {
 451   unsigned int i;
 452   struct avr_opcodes_s *opcode;
 453
 454   avr_hash = hash_new ();
 455
 456   /* Insert unique names into hash table.  This hash table then provides a
 457      quick index to the first opcode with a particular name in the opcode
 458      table.  */
 459   for (opcode = avr_opcodes; opcode->name; opcode++)
 460     hash_insert (avr_hash, opcode->name, (char *) opcode);
 461
 462   avr_mod_hash = hash_new ();
 463
 464   for (i = 0; i < ARRAY_SIZE (exp_mod); ++i)
 465     {
 466       mod_index m;
 467
 468       m.index = i + 10;
 469       hash_insert (avr_mod_hash, EXP_MOD_NAME (i), m.ptr);
 470     }
 471
 472   bfd_set_arch_mach (stdoutput, TARGET_ARCH, avr_mcu->mach);
 473 }
 474
 475 /* Resolve STR as a constant expression and return the result.
 476    If result greater than MAX then error.  */
 477
 478 static unsigned int
 479 avr_get_constant (char *str, int max)
 480 {
 481   expressionS ex;
 482
 483   str = skip_space (str);
 484   input_line_pointer = str;
 485   expression (& ex);
 486
 487   if (ex.X_op != O_constant)
 488     as_bad (_("constant value required"));
 489
 490   if (ex.X_add_number > max || ex.X_add_number < 0)
 491     as_bad (_("number must be less than %d"), max + 1);
 492
 493   return ex.X_add_number;
 494 }
 495
 496 /* Parse for ldd/std offset.  */
 497
 498 static void
 499 avr_offset_expression (expressionS *exp)
 500 {
 501   char *str = input_line_pointer;
 502   char *tmp;
 503   char op[8];
 504
 505   tmp = str;
 506   str = extract_word (str, op, sizeof (op));
 507
 508   input_line_pointer = tmp;
 509   expression (exp);
 510
 511   /* Warn about expressions that fail to use lo8 ().  */
 512   if (exp->X_op == O_constant)
 513     {
 514       int x = exp->X_add_number;
 515
 516       if (x < -255 || x > 255)
 517         as_warn (_("constant out of 8-bit range: %d"), x);
 518     }
 519 }
 520
 521 /* Parse ordinary expression.  */
 522
 523 static char *
 524 parse_exp (char *s, expressionS *op)
 525 {
 526   input_line_pointer = s;
 527   expression (op);
 528   if (op->X_op == O_absent)
 529     as_bad (_("missing operand"));
 530   return input_line_pointer;
 531 }
 532
 533 /* Parse special expressions (needed for LDI command):
 534    xx8 (address)
 535    xx8 (-address)
 536    pm_xx8 (address)
 537    pm_xx8 (-address)
 538    where xx is: hh, hi, lo.  */
 539
 540 static bfd_reloc_code_real_type
 541 avr_ldi_expression (expressionS *exp)
 542 {
 543   char *str = input_line_pointer;
 544   char *tmp;
 545   char op[8];
 546   int mod;
 547   tmp = str;
 548
 549   str = extract_word (str, op, sizeof (op));
 550
 551   if (op[0])
 552     {
 553       mod_index m;
 554
 555       m.ptr = hash_find (avr_mod_hash, op);
 556       mod = m.index;
 557
 558       if (mod)
 559         {
 560           int closes = 0;
 561
 562           mod -= 10;
 563           str = skip_space (str);
 564
 565           if (*str == '(')
 566             {
 567               int neg_p = 0;
 568
 569               ++str;
 570
 571               if (strncmp ("pm(", str, 3) == 0
 572                   || strncmp ("-(pm(", str, 5) == 0)
 573                 {
 574                   if (HAVE_PM_P (mod))
 575                     {
 576                       ++mod;
 577                       ++closes;
 578                     }
 579                   else
 580                     as_bad (_("illegal expression"));
 581
 582                   if (*str == '-')
 583                     {
 584                       neg_p = 1;
 585                       ++closes;
 586                       str += 5;
 587                     }
 588                   else
 589                     str += 3;
 590                 }
 591
 592               if (*str == '-' && *(str + 1) == '(')
 593                 {
 594                   neg_p ^= 1;
 595                   ++closes;
 596                   str += 2;
 597                 }
 598
 599               input_line_pointer = str;
 600               expression (exp);
 601
 602               do
 603                 {
 604                   if (*input_line_pointer != ')')
 605                     {
 606                       as_bad (_("`)' required"));
 607                       break;
 608                     }
 609                   input_line_pointer++;
 610                 }
 611               while (closes--);
 612
 613               return neg_p ? EXP_MOD_NEG_RELOC (mod) : EXP_MOD_RELOC (mod);
 614             }
 615         }
 616     }
 617
 618   input_line_pointer = tmp;
 619   expression (exp);
 620
 621   /* Warn about expressions that fail to use lo8 ().  */
 622   if (exp->X_op == O_constant)
 623     {
 624       int x = exp->X_add_number;
 625
 626       if (x < -255 || x > 255)
 627         as_warn (_("constant out of 8-bit range: %d"), x);
 628     }
 629
 630   return BFD_RELOC_AVR_LDI;
 631 }
 632
 633 /* Parse one instruction operand.
 634    Return operand bitmask.  Also fixups can be generated.  */
 635
 636 static unsigned int
 637 avr_operand (struct avr_opcodes_s *opcode,
 638              int where,
 639              char *op,
 640              char **line)
 641 {
 642   expressionS op_expr;
 643   unsigned int op_mask = 0;
 644   char *str = skip_space (*line);
 645
 646   switch (*op)
 647     {
 648       /* Any register operand.  */
 649     case 'w':
 650     case 'd':
 651     case 'r':
 652     case 'a':
 653     case 'v':
 654       if (*str == 'r' || *str == 'R')
 655         {
 656           char r_name[20];
 657
 658           str = extract_word (str, r_name, sizeof (r_name));
 659           op_mask = 0xff;
 660           if (ISDIGIT (r_name[1]))
 661             {
 662               if (r_name[2] == '\0')
 663                 op_mask = r_name[1] - '0';
 664               else if (r_name[1] != '0'
 665                        && ISDIGIT (r_name[2])
 666                        && r_name[3] == '\0')
 667                 op_mask = (r_name[1] - '0') * 10 + r_name[2] - '0';
 668             }
 669         }
 670       else
 671         {
 672           op_mask = avr_get_constant (str, 31);
 673           str = input_line_pointer;
 674         }
 675
 676       if (op_mask <= 31)
 677         {
 678           switch (*op)
 679             {
 680             case 'a':
 681               if (op_mask < 16 || op_mask > 23)
 682                 as_bad (_("register r16-r23 required"));
 683               op_mask -= 16;
 684               break;
 685
 686             case 'd':
 687               if (op_mask < 16)
 688                 as_bad (_("register number above 15 required"));
 689               op_mask -= 16;
 690               break;
 691
 692             case 'v':
 693               if (op_mask & 1)
 694                 as_bad (_("even register number required"));
 695               op_mask >>= 1;
 696               break;
 697
 698             case 'w':
 699               if ((op_mask & 1) || op_mask < 24)
 700                 as_bad (_("register r24, r26, r28 or r30 required"));
 701               op_mask = (op_mask - 24) >> 1;
 702               break;
 703             }
 704           break;
 705         }
 706       as_bad (_("register name or number from 0 to 31 required"));
 707       break;
 708
 709     case 'e':
 710       {
 711         char c;
 712
 713         if (*str == '-')
 714           {
 715             str = skip_space (str + 1);
 716             op_mask = 0x1002;
 717           }
 718         c = TOLOWER (*str);
 719         if (c == 'x')
 720           op_mask |= 0x100c;
 721         else if (c == 'y')
 722           op_mask |= 0x8;
 723         else if (c != 'z')
 724           as_bad (_("pointer register (X, Y or Z) required"));
 725
 726         str = skip_space (str + 1);
 727         if (*str == '+')
 728           {
 729             ++str;
 730             if (op_mask & 2)
 731               as_bad (_("cannot both predecrement and postincrement"));
 732             op_mask |= 0x1001;
 733           }
 734
 735         /* avr1 can do "ld r,Z" and "st Z,r" but no other pointer
 736            registers, no predecrement, no postincrement.  */
 737         if (!avr_opt.all_opcodes && (op_mask & 0x100F)
 738             && !(avr_mcu->isa & AVR_ISA_SRAM))
 739           as_bad (_("addressing mode not supported"));
 740       }
 741       break;
 742
 743     case 'z':
 744       if (*str == '-')
 745         as_bad (_("can't predecrement"));
 746
 747       if (! (*str == 'z' || *str == 'Z'))
 748         as_bad (_("pointer register Z required"));
 749
 750       str = skip_space (str + 1);
 751
 752       if (*str == '+')
 753         {
 754           ++str;
 755           op_mask |= 1;
 756         }
 757       break;
 758
 759     case 'b':
 760       {
 761         char c = TOLOWER (*str++);
 762
 763         if (c == 'y')
 764           op_mask |= 0x8;
 765         else if (c != 'z')
 766           as_bad (_("pointer register (Y or Z) required"));
 767         str = skip_space (str);
 768         if (*str++ == '+')
 769           {
 770             input_line_pointer = str;
 771             avr_offset_expression (& op_expr);
 772             str = input_line_pointer;
 773             fix_new_exp (frag_now, where, 3,
 774                          &op_expr, FALSE, BFD_RELOC_AVR_6);
 775           }
 776       }
 777       break;
 778
 779     case 'h':
 780       str = parse_exp (str, &op_expr);
 781       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 782                    &op_expr, FALSE, BFD_RELOC_AVR_CALL);
 783       break;
 784
 785     case 'L':
 786       str = parse_exp (str, &op_expr);
 787       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 788                    &op_expr, TRUE, BFD_RELOC_AVR_13_PCREL);
 789       break;
 790
 791     case 'l':
 792       str = parse_exp (str, &op_expr);
 793       fix_new_exp (frag_now, where, opcode->insn_size * 2,
 794                    &op_expr, TRUE, BFD_RELOC_AVR_7_PCREL);
 795       break;
 796
 797     case 'i':
 798       str = parse_exp (str, &op_expr);
 799       fix_new_exp (frag_now, where + 2, opcode->insn_size * 2,
 800                    &op_expr, FALSE, BFD_RELOC_16);
 801       break;
 802
 803     case 'M':
 804       {
 805         bfd_reloc_code_real_type r_type;
 806
 807         input_line_pointer = str;
 808         r_type = avr_ldi_expression (&op_expr);
 809         str = input_line_pointer;
 810         fix_new_exp (frag_now, where, 3,
 811                      &op_expr, FALSE, r_type);
 812       }
 813       break;
 814
 815     case 'n':
 816       {
 817         unsigned int x;
 818
 819         x = ~avr_get_constant (str, 255);
 820         str = input_line_pointer;
 821         op_mask |= (x & 0xf) | ((x << 4) & 0xf00);
 822       }
 823       break;
 824
 825     case 'K':
 826       input_line_pointer = str;
 827       avr_offset_expression (& op_expr);
 828       str = input_line_pointer;
 829       fix_new_exp (frag_now, where, 3,
 830                    & op_expr, FALSE, BFD_RELOC_AVR_6_ADIW);
 831       break;
 832
 833     case 'S':
 834     case 's':
 835       {
 836         unsigned int x;
 837
 838         x = avr_get_constant (str, 7);
 839         str = input_line_pointer;
 840         if (*op == 'S')
 841           x <<= 4;
 842         op_mask |= x;
 843       }
 844       break;
 845
 846     case 'P':
 847       {
 848         unsigned int x;
 849
 850         x = avr_get_constant (str, 63);
 851         str = input_line_pointer;
 852         op_mask |= (x & 0xf) | ((x & 0x30) << 5);
 853       }
 854       break;
 855
 856     case 'p':
 857       {
 858         unsigned int x;
 859
 860         x = avr_get_constant (str, 31);
 861         str = input_line_pointer;
 862         op_mask |= x << 3;
 863       }
 864       break;
 865
 866     case '?':
 867       break;
 868
 869     default:
 870       as_bad (_("unknown constraint `%c'"), *op);
 871     }
 872
 873   *line = str;
 874   return op_mask;
 875 }
 876
 877 /* Parse instruction operands.
 878    Return binary opcode.  */
 879
 880 static unsigned int
 881 avr_operands (struct avr_opcodes_s *opcode, char **line)
 882 {
 883   char *op = opcode->constraints;
 884   unsigned int bin = opcode->bin_opcode;
 885   char *frag = frag_more (opcode->insn_size * 2);
 886   char *str = *line;
 887   int where = frag - frag_now->fr_literal;
 888   static unsigned int prev = 0;  /* Previous opcode.  */
 889
 890   /* Opcode have operands.  */
 891   if (*op)
 892     {
 893       unsigned int reg1 = 0;
 894       unsigned int reg2 = 0;
 895       int reg1_present = 0;
 896       int reg2_present = 0;
 897
 898       /* Parse first operand.  */
 899       if (REGISTER_P (*op))
 900         reg1_present = 1;
 901       reg1 = avr_operand (opcode, where, op, &str);
 902       ++op;
 903
 904       /* Parse second operand.  */
 905       if (*op)
 906         {
 907           if (*op == ',')
 908             ++op;
 909
 910           if (*op == '=')
 911             {
 912               reg2 = reg1;
 913               reg2_present = 1;
 914             }
 915           else
 916             {
 917               if (REGISTER_P (*op))
 918                 reg2_present = 1;
 919
 920               str = skip_space (str);
 921               if (*str++ != ',')
 922                 as_bad (_("`,' required"));
 923               str = skip_space (str);
 924
 925               reg2 = avr_operand (opcode, where, op, &str);
 926             }
 927
 928           if (reg1_present && reg2_present)
 929             reg2 = (reg2 & 0xf) | ((reg2 << 5) & 0x200);
 930           else if (reg2_present)
 931             reg2 <<= 4;
 932         }
 933       if (reg1_present)
 934         reg1 <<= 4;
 935       bin |= reg1 | reg2;
 936     }
 937
 938   /* Detect undefined combinations (like ld r31,Z+).  */
 939   if (!avr_opt.all_opcodes && AVR_UNDEF_P (bin))
 940     as_warn (_("undefined combination of operands"));
 941
 942   if (opcode->insn_size == 2)
 943     {
 944       /* Warn if the previous opcode was cpse/sbic/sbis/sbrc/sbrs
 945          (AVR core bug, fixed in the newer devices).  */
 946       if (!(avr_opt.no_skip_bug ||
 947             (avr_mcu->isa & (AVR_ISA_MUL | AVR_ISA_MOVW)))
 948           && AVR_SKIP_P (prev))
 949         as_warn (_("skipping two-word instruction"));
 950
 951       bfd_putl32 ((bfd_vma) bin, frag);
 952     }
 953   else
 954     bfd_putl16 ((bfd_vma) bin, frag);
 955
 956   prev = bin;
 957   *line = str;
 958   return bin;
 959 }
 960
 961 /* GAS will call this function for each section at the end of the assembly,
 962    to permit the CPU backend to adjust the alignment of a section.  */
 963
 964 valueT
 965 md_section_align (asection *seg, valueT addr)
 966 {
 967   int align = bfd_get_section_alignment (stdoutput, seg);
 968   return ((addr + (1 << align) - 1) & (-1 << align));
 969 }
 970
 971 /* If you define this macro, it should return the offset between the
 972    address of a PC relative fixup and the position from which the PC
 973    relative adjustment should be made.  On many processors, the base
 974    of a PC relative instruction is the next instruction, so this
 975    macro would return the length of an instruction.  */
 976
 977 long
 978 md_pcrel_from_section (fixS *fixp, segT sec)
 979 {
 980   if (fixp->fx_addsy != (symbolS *) NULL
 981       && (!S_IS_DEFINED (fixp->fx_addsy)
 982           || (S_GET_SEGMENT (fixp->fx_addsy) != sec)))
 983     return 0;
 984
 985   return fixp->fx_frag->fr_address + fixp->fx_where;
 986 }
 987
 988 /* GAS will call this for each fixup.  It should store the correct
 989    value in the object file.  */
 990
 991 void
 992 md_apply_fix (fixS *fixP, valueT * valP, segT seg)
 993 {
 994   unsigned char *where;
 995   unsigned long insn;
 996   long value = *valP;
 997
 998   if (fixP->fx_addsy == (symbolS *) NULL)
 999     fixP->fx_done = 1;
1000
1001   else if (fixP->fx_pcrel)
1002     {
1003       segT s = S_GET_SEGMENT (fixP->fx_addsy);
1004
1005       if (s == seg || s == absolute_section)
1006         {
1007           value += S_GET_VALUE (fixP->fx_addsy);
1008           fixP->fx_done = 1;
1009         }
1010     }
1011
1012   /* We don't actually support subtracting a symbol.  */
1013   if (fixP->fx_subsy != (symbolS *) NULL)
1014     as_bad_where (fixP->fx_file, fixP->fx_line, _("expression too complex"));
1015
1016   switch (fixP->fx_r_type)
1017     {
1018     default:
1019       fixP->fx_no_overflow = 1;
1020       break;
1021     case BFD_RELOC_AVR_7_PCREL:
1022     case BFD_RELOC_AVR_13_PCREL:
1023     case BFD_RELOC_32:
1024     case BFD_RELOC_16:
1025     case BFD_RELOC_AVR_CALL:
1026       break;
1027     }
1028
1029   if (fixP->fx_done)
1030     {
1031       /* Fetch the instruction, insert the fully resolved operand
1032          value, and stuff the instruction back again.  */
1033       where = (unsigned char *) fixP->fx_frag->fr_literal + fixP->fx_where;
1034       insn = bfd_getl16 (where);
1035
1036       switch (fixP->fx_r_type)
1037         {
1038         case BFD_RELOC_AVR_7_PCREL:
1039           if (value & 1)
1040             as_bad_where (fixP->fx_file, fixP->fx_line,
1041                           _("odd address operand: %ld"), value);
1042
1043           /* Instruction addresses are always right-shifted by 1.  */
1044           value >>= 1;
1045           --value;                      /* Correct PC.  */
1046
1047           if (value < -64 || value > 63)
1048             as_bad_where (fixP->fx_file, fixP->fx_line,
1049                           _("operand out of range: %ld"), value);
1050           value = (value << 3) & 0x3f8;
1051           bfd_putl16 ((bfd_vma) (value | insn), where);
1052           break;
1053
1054         case BFD_RELOC_AVR_13_PCREL:
1055           if (value & 1)
1056             as_bad_where (fixP->fx_file, fixP->fx_line,
1057                           _("odd address operand: %ld"), value);
1058
1059           /* Instruction addresses are always right-shifted by 1.  */
1060           value >>= 1;
1061           --value;                      /* Correct PC.  */
1062
1063           if (value < -2048 || value > 2047)
1064             {
1065               /* No wrap for devices with >8K of program memory.  */
1066               if ((avr_mcu->isa & AVR_ISA_MEGA) || avr_opt.no_wrap)
1067                 as_bad_where (fixP->fx_file, fixP->fx_line,
1068                               _("operand out of range: %ld"), value);
1069             }
1070
1071           value &= 0xfff;
1072           bfd_putl16 ((bfd_vma) (value | insn), where);
1073           break;
1074
1075         case BFD_RELOC_32:
1076           bfd_putl16 ((bfd_vma) value, where);
1077           break;
1078
1079         case BFD_RELOC_16:
1080           bfd_putl16 ((bfd_vma) value, where);
1081           break;
1082
1083         case BFD_RELOC_AVR_16_PM:
1084           bfd_putl16 ((bfd_vma) (value >> 1), where);
1085           break;
1086
1087         case BFD_RELOC_AVR_LDI:
1088           if (value > 255)
1089             as_bad_where (fixP->fx_file, fixP->fx_line,
1090                           _("operand out of range: %ld"), value);
1091           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value), where);
1092           break;
1093
1094         case BFD_RELOC_AVR_6:
1095           if ((value > 63) || (value < 0))
1096             as_bad_where (fixP->fx_file, fixP->fx_line,
1097                           _("operand out of range: %ld"), value);
1098           bfd_putl16 ((bfd_vma) insn | ((value & 7) | ((value & (3 << 3)) << 7) | ((value & (1 << 5)) << 8)), where);
1099           break;
1100
1101         case BFD_RELOC_AVR_6_ADIW:
1102           if ((value > 63) || (value < 0))
1103             as_bad_where (fixP->fx_file, fixP->fx_line,
1104                           _("operand out of range: %ld"), value);
1105           bfd_putl16 ((bfd_vma) insn | (value & 0xf) | ((value & 0x30) << 2), where);
1106           break;
1107
1108         case BFD_RELOC_AVR_LO8_LDI:
1109           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value), where);
1110           break;
1111
1112         case BFD_RELOC_AVR_HI8_LDI:
1113           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 8), where);
1114           break;
1115
1116         case BFD_RELOC_AVR_MS8_LDI:
1117           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 24), where);
1118           break;
1119
1120         case BFD_RELOC_AVR_HH8_LDI:
1121           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 16), where);
1122           break;
1123
1124         case BFD_RELOC_AVR_LO8_LDI_NEG:
1125           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value), where);
1126           break;
1127
1128         case BFD_RELOC_AVR_HI8_LDI_NEG:
1129           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 8), where);
1130           break;
1131
1132         case BFD_RELOC_AVR_MS8_LDI_NEG:
1133           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 24), where);
1134           break;
1135
1136         case BFD_RELOC_AVR_HH8_LDI_NEG:
1137           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 16), where);
1138           break;
1139
1140         case BFD_RELOC_AVR_LO8_LDI_PM:
1141           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 1), where);
1142           break;
1143
1144         case BFD_RELOC_AVR_HI8_LDI_PM:
1145           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 9), where);
1146           break;
1147
1148         case BFD_RELOC_AVR_HH8_LDI_PM:
1149           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (value >> 17), where);
1150           break;
1151
1152         case BFD_RELOC_AVR_LO8_LDI_PM_NEG:
1153           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 1), where);
1154           break;
1155
1156         case BFD_RELOC_AVR_HI8_LDI_PM_NEG:
1157           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 9), where);
1158           break;
1159
1160         case BFD_RELOC_AVR_HH8_LDI_PM_NEG:
1161           bfd_putl16 ((bfd_vma) insn | LDI_IMMEDIATE (-value >> 17), where);
1162           break;
1163
1164         case BFD_RELOC_AVR_CALL:
1165           {
1166             unsigned long x;
1167
1168             x = bfd_getl16 (where);
1169             if (value & 1)
1170               as_bad_where (fixP->fx_file, fixP->fx_line,
1171                             _("odd address operand: %ld"), value);
1172             value >>= 1;
1173             x |= ((value & 0x10000) | ((value << 3) & 0x1f00000)) >> 16;
1174             bfd_putl16 ((bfd_vma) x, where);
1175             bfd_putl16 ((bfd_vma) (value & 0xffff), where + 2);
1176           }
1177           break;
1178
1179         default:
1180           as_fatal (_("line %d: unknown relocation type: 0x%x"),
1181                     fixP->fx_line, fixP->fx_r_type);
1182           break;
1183         }
1184     }
1185   else
1186     {
1187       switch (fixP->fx_r_type)
1188         {
1189         case -BFD_RELOC_AVR_HI8_LDI_NEG:
1190         case -BFD_RELOC_AVR_HI8_LDI:
1191         case -BFD_RELOC_AVR_LO8_LDI_NEG:
1192         case -BFD_RELOC_AVR_LO8_LDI:
1193           as_bad_where (fixP->fx_file, fixP->fx_line,
1194                         _("only constant expression allowed"));
1195           fixP->fx_done = 1;
1196           break;
1197         default:
1198           break;
1199         }
1200     }
1201 }
1202
1203 /* GAS will call this to generate a reloc, passing the resulting reloc
1204    to `bfd_install_relocation'.  This currently works poorly, as
1205    `bfd_install_relocation' often does the wrong thing, and instances of
1206    `tc_gen_reloc' have been written to work around the problems, which
1207    in turns makes it difficult to fix `bfd_install_relocation'.  */
1208
1209 /* If while processing a fixup, a reloc really needs to be created
1210    then it is done here.  */
1211
1212 arelent *
1213 tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED,
1214               fixS *fixp)
1215 {
1216   arelent *reloc;
1217
1218   if (fixp->fx_addsy && fixp->fx_subsy)
1219     {
1220       long value = 0;
1221
1222       if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))
1223           || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)
1224         {
1225           as_bad_where (fixp->fx_file, fixp->fx_line,
1226               "Difference of symbols in different sections is not supported");
1227           return NULL;
1228         }
1229
1230       /* We are dealing with two symbols defined in the same section.
1231          Let us fix-up them here.  */
1232       value += S_GET_VALUE (fixp->fx_addsy);
1233       value -= S_GET_VALUE (fixp->fx_subsy);
1234
1235       /* When fx_addsy and fx_subsy both are zero, md_apply_fix
1236          only takes it's second operands for the fixup value.  */
1237       fixp->fx_addsy = NULL;
1238       fixp->fx_subsy = NULL;
1239       md_apply_fix (fixp, (valueT *) &value, NULL);
1240
1241       return NULL;
1242     }
1243
1244   reloc = xmalloc (sizeof (arelent));
1245
1246   reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1247   *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1248
1249   reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1250   reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
1251   if (reloc->howto == (reloc_howto_type *) NULL)
1252     {
1253       as_bad_where (fixp->fx_file, fixp->fx_line,
1254                     _("reloc %d not supported by object file format"),
1255                     (int) fixp->fx_r_type);
1256       return NULL;
1257     }
1258
1259   if (fixp->fx_r_type == BFD_RELOC_VTABLE_INHERIT
1260       || fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
1261     reloc->address = fixp->fx_offset;
1262
1263   reloc->addend = fixp->fx_offset;
1264
1265   return reloc;
1266 }
1267
1268 void
1269 md_assemble (char *str)
1270 {
1271   struct avr_opcodes_s *opcode;
1272   char op[11];
1273
1274   str = skip_space (extract_word (str, op, sizeof (op)));
1275
1276   if (!op[0])
1277     as_bad (_("can't find opcode "));
1278
1279   opcode = (struct avr_opcodes_s *) hash_find (avr_hash, op);
1280
1281   if (opcode == NULL)
1282     {
1283       as_bad (_("unknown opcode `%s'"), op);
1284       return;
1285     }
1286
1287   /* Special case for opcodes with optional operands (lpm, elpm) -
1288      version with operands exists in avr_opcodes[] in the next entry.  */
1289
1290   if (*str && *opcode->constraints == '?')
1291     ++opcode;
1292
1293   if (!avr_opt.all_opcodes && (opcode->isa & avr_mcu->isa) != opcode->isa)
1294     as_bad (_("illegal opcode %s for mcu %s"), opcode->name, avr_mcu->name);
1295
1296   /* We used to set input_line_pointer to the result of get_operands,
1297      but that is wrong.  Our caller assumes we don't change it.  */
1298   {
1299     char *t = input_line_pointer;
1300
1301     avr_operands (opcode, &str);
1302     if (*skip_space (str))
1303       as_bad (_("garbage at end of line"));
1304     input_line_pointer = t;
1305   }
1306 }
1307
1308 /* Flag to pass `pm' mode between `avr_parse_cons_expression' and
1309    `avr_cons_fix_new'.  */
1310 static int exp_mod_pm = 0;
1311
1312 /* Parse special CONS expression: pm (expression)
1313    which is used for addressing to a program memory.
1314    Relocation: BFD_RELOC_AVR_16_PM.  */
1315
1316 void
1317 avr_parse_cons_expression (expressionS *exp, int nbytes)
1318 {
1319   char *tmp;
1320
1321   exp_mod_pm = 0;
1322
1323   tmp = input_line_pointer = skip_space (input_line_pointer);
1324
1325   if (nbytes == 2)
1326     {
1327       char *pm_name = "pm";
1328       int len = strlen (pm_name);
1329
1330       if (strncasecmp (input_line_pointer, pm_name, len) == 0)
1331         {
1332           input_line_pointer = skip_space (input_line_pointer + len);
1333
1334           if (*input_line_pointer == '(')
1335             {
1336               input_line_pointer = skip_space (input_line_pointer + 1);
1337               exp_mod_pm = 1;
1338               expression (exp);
1339
1340               if (*input_line_pointer == ')')
1341                 ++input_line_pointer;
1342               else
1343                 {
1344                   as_bad (_("`)' required"));
1345                   exp_mod_pm = 0;
1346                 }
1347
1348               return;
1349             }
1350
1351           input_line_pointer = tmp;
1352         }
1353     }
1354
1355   expression (exp);
1356 }
1357
1358 void
1359 avr_cons_fix_new (fragS *frag,
1360                   int where,
1361                   int nbytes,
1362                   expressionS *exp)
1363 {
1364   if (exp_mod_pm == 0)
1365     {
1366       if (nbytes == 2)
1367         fix_new_exp (frag, where, nbytes, exp, FALSE, BFD_RELOC_16);
1368       else if (nbytes == 4)
1369         fix_new_exp (frag, where, nbytes, exp, FALSE, BFD_RELOC_32);
1370       else
1371         as_bad (_("illegal %srelocation size: %d"), "", nbytes);
1372     }
1373   else
1374     {
1375       if (nbytes == 2)
1376         fix_new_exp (frag, where, nbytes, exp, FALSE, BFD_RELOC_AVR_16_PM);
1377       else
1378         as_bad (_("illegal %srelocation size: %d"), "`pm' ", nbytes);
1379       exp_mod_pm = 0;
1380     }
1381 }