gas/config/tc-pj.c

   1 /*-
   2    tc-pj.c -- Assemble code for Pico Java
   3    Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to
  19    the Free Software Foundation, 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* Contributed by Steve Chamberlain of Transmeta <sac@pobox.com>.  */
  23
  24 #include "as.h"
  25 #include "safe-ctype.h"
  26 #include "opcode/pj.h"
  27
  28 extern const pj_opc_info_t pj_opc_info[512];
  29
  30 const char comment_chars[] = "!/";
  31 const char line_separator_chars[] = ";";
  32 const char line_comment_chars[] = "/!#";
  33
  34 static int pending_reloc;
  35 static struct hash_control *opcode_hash_control;
  36
  37 static void little
  38   PARAMS ((int));
  39 static void big
  40   PARAMS ((int));
  41 static char *parse_exp_save_ilp
  42   PARAMS ((char *, expressionS *));
  43 static int c_to_r
  44   PARAMS ((char));
  45 static void ipush_code
  46   PARAMS ((pj_opc_info_t *, char *));
  47 static void fake_opcode
  48   PARAMS ((const char *, void (*) (struct pj_opc_info_t *, char *)));
  49 static void alias
  50   PARAMS ((const char *, const char *));
  51
  52 static void
  53 little (ignore)
  54      int ignore ATTRIBUTE_UNUSED;
  55 {
  56   target_big_endian = 0;
  57 }
  58
  59 static void
  60 big (ignore)
  61      int ignore ATTRIBUTE_UNUSED;
  62 {
  63   target_big_endian = 1;
  64 }
  65
  66 const pseudo_typeS md_pseudo_table[] = {
  67   {"ml",    little, 0},
  68   {"mb",    big,    0},
  69   {0, 0, 0}
  70 };
  71
  72 const char FLT_CHARS[] = "rRsSfFdDxXpP";
  73 const char EXP_CHARS[] = "eE";
  74
  75 void
  76 md_operand (op)
  77      expressionS *op;
  78 {
  79   if (strncmp (input_line_pointer, "%hi16", 5) == 0)
  80     {
  81       if (pending_reloc)
  82         as_bad (_("confusing relocation expressions"));
  83       pending_reloc = BFD_RELOC_PJ_CODE_HI16;
  84       input_line_pointer += 5;
  85       expression (op);
  86     }
  87   if (strncmp (input_line_pointer, "%lo16", 5) == 0)
  88     {
  89       if (pending_reloc)
  90         as_bad (_("confusing relocation expressions"));
  91       pending_reloc = BFD_RELOC_PJ_CODE_LO16;
  92       input_line_pointer += 5;
  93       expression (op);
  94     }
  95 }
  96
  97 /* Parse an expression and then restore the input line pointer.  */
  98
  99 static char *
 100 parse_exp_save_ilp (s, op)
 101      char *s;
 102      expressionS *op;
 103 {
 104   char *save = input_line_pointer;
 105   input_line_pointer = s;
 106   expression (op);
 107   s = input_line_pointer;
 108   input_line_pointer = save;
 109   return s;
 110 }
 111
 112 /* This is called by emit_expr via TC_CONS_FIX_NEW when creating a
 113    reloc for a cons.  We could use the definition there, except that
 114    we want to handle magic pending reloc expressions specially.  */
 115
 116 void
 117 pj_cons_fix_new_pj (frag, where, nbytes, exp)
 118      fragS *frag;
 119      int where;
 120      int nbytes;
 121      expressionS *exp;
 122 {
 123   static int rv[5][2] =
 124   { { 0, 0 },
 125     { BFD_RELOC_8, BFD_RELOC_8 },
 126     { BFD_RELOC_PJ_CODE_DIR16, BFD_RELOC_16 },
 127     { 0, 0 },
 128     { BFD_RELOC_PJ_CODE_DIR32, BFD_RELOC_32 }};
 129
 130   fix_new_exp (frag, where, nbytes, exp, 0,
 131                pending_reloc ? pending_reloc
 132                : rv[nbytes][(now_seg->flags & SEC_CODE) ? 0 : 1]);
 133
 134   pending_reloc = 0;
 135 }
 136
 137 /* Turn a reloc description character from the pj-opc.h table into
 138    code which BFD can handle.  */
 139
 140 static int
 141 c_to_r (x)
 142      char x;
 143 {
 144   switch (x)
 145     {
 146     case O_R8:
 147       return BFD_RELOC_8_PCREL;
 148     case O_U8:
 149     case O_8:
 150       return BFD_RELOC_8;
 151     case O_R16:
 152       return BFD_RELOC_PJ_CODE_REL16;
 153     case O_U16:
 154     case O_16:
 155       return BFD_RELOC_PJ_CODE_DIR16;
 156     case O_R32:
 157       return BFD_RELOC_PJ_CODE_REL32;
 158     case O_32:
 159       return BFD_RELOC_PJ_CODE_DIR32;
 160     }
 161   abort ();
 162   return 0;
 163 }
 164
 165 /* Handler for the ipush fake opcode,
 166    turns ipush <foo> into sipush lo16<foo>, sethi hi16<foo>.  */
 167
 168 static void
 169 ipush_code (opcode, str)
 170      pj_opc_info_t *opcode ATTRIBUTE_UNUSED;
 171      char *str;
 172 {
 173   char *b = frag_more (6);
 174   expressionS arg;
 175
 176   b[0] = 0x11;
 177   b[3] = 0xed;
 178   parse_exp_save_ilp (str + 1, &arg);
 179   if (pending_reloc)
 180     {
 181       as_bad (_("can't have relocation for ipush"));
 182       pending_reloc = 0;
 183     }
 184
 185   fix_new_exp (frag_now, b - frag_now->fr_literal + 1, 2,
 186                &arg, 0, BFD_RELOC_PJ_CODE_DIR16);
 187   fix_new_exp (frag_now, b - frag_now->fr_literal + 4, 2,
 188                &arg, 0, BFD_RELOC_PJ_CODE_HI16);
 189 }
 190
 191 /* Insert names into the opcode table which are really mini macros,
 192    not opcodes.  The fakeness is inidicated with an opcode of -1.  */
 193
 194 static void
 195 fake_opcode (name, func)
 196      const char *name;
 197      void (*func) PARAMS ((struct pj_opc_info_t *, char *));
 198 {
 199   pj_opc_info_t *fake = (pj_opc_info_t *) xmalloc (sizeof (pj_opc_info_t));
 200
 201   fake->opcode = -1;
 202   fake->opcode_next = -1;
 203   fake->u.func = func;
 204   hash_insert (opcode_hash_control, name, (char *) fake);
 205 }
 206
 207 /* Enter another entry into the opcode hash table so the same opcode
 208    can have another name.  */
 209
 210 static void
 211 alias (new, old)
 212      const char *new;
 213      const char *old;
 214 {
 215   hash_insert (opcode_hash_control, new,
 216                (char *) hash_find (opcode_hash_control, old));
 217 }
 218
 219 /* This function is called once, at assembler startup time.  It sets
 220    up the hash table with all the opcodes in it, and also initializes
 221    some aliases for compatibility with other assemblers.  */
 222
 223 void
 224 md_begin ()
 225 {
 226   const pj_opc_info_t *opcode;
 227   opcode_hash_control = hash_new ();
 228
 229   /* Insert names into hash table.  */
 230   for (opcode = pj_opc_info; opcode->u.name; opcode++)
 231     hash_insert (opcode_hash_control, opcode->u.name, (char *) opcode);
 232
 233   /* Insert the only fake opcode.  */
 234   fake_opcode ("ipush", ipush_code);
 235
 236   /* Add some aliases for opcode names.  */
 237   alias ("ifeq_s", "ifeq");
 238   alias ("ifne_s", "ifne");
 239   alias ("if_icmpge_s", "if_icmpge");
 240   alias ("if_icmpne_s", "if_icmpne");
 241   alias ("if_icmpeq_s", "if_icmpeq");
 242   alias ("if_icmpgt_s", "if_icmpgt");
 243   alias ("goto_s", "goto");
 244
 245   bfd_set_arch_mach (stdoutput, TARGET_ARCH, 0);
 246 }
 247
 248 /* This is the guts of the machine-dependent assembler.  STR points to
 249    a machine dependent instruction.  This function is supposed to emit
 250    the frags/bytes it assembles to.  */
 251
 252 void
 253 md_assemble (str)
 254      char *str;
 255 {
 256   unsigned char *op_start;
 257   unsigned char *op_end;
 258
 259 #if 0
 260   pj_operan_info operand[3];
 261 #endif
 262   pj_opc_info_t *opcode;
 263   char *output;
 264   int idx = 0;
 265   char pend;
 266
 267   int nlen = 0;
 268
 269   /* Drop leading whitespace.  */
 270   while (*str == ' ')
 271     str++;
 272
 273   /* Find the op code end.  */
 274   for (op_start = op_end = (unsigned char *) (str);
 275        *op_end && !is_end_of_line[*op_end] && *op_end != ' ';
 276        op_end++)
 277     nlen++;
 278
 279   pend = *op_end;
 280   *op_end = 0;
 281
 282   if (nlen == 0)
 283     as_bad (_("can't find opcode "));
 284
 285   opcode = (pj_opc_info_t *) hash_find (opcode_hash_control, op_start);
 286   *op_end = pend;
 287
 288   if (opcode == NULL)
 289     {
 290       as_bad (_("unknown opcode %s"), op_start);
 291       return;
 292     }
 293
 294   if (opcode->opcode == -1)
 295     {
 296       /* It's a fake opcode.  Dig out the args and pretend that was
 297          what we were passed.  */
 298       (*opcode->u.func) (opcode, op_end);
 299     }
 300   else
 301     {
 302       int an;
 303
 304       output = frag_more (opcode->len);
 305       output[idx++] = opcode->opcode;
 306
 307       if (opcode->opcode_next != -1)
 308         output[idx++] = opcode->opcode_next;
 309
 310       for (an = 0; opcode->arg[an]; an++)
 311         {
 312           expressionS arg;
 313
 314           if (*op_end == ',' && an != 0)
 315             op_end++;
 316
 317           if (*op_end == 0)
 318             as_bad ("expected expresssion");
 319
 320           op_end = parse_exp_save_ilp (op_end, &arg);
 321
 322           fix_new_exp (frag_now,
 323                        output - frag_now->fr_literal + idx,
 324                        ASIZE (opcode->arg[an]),
 325                        &arg,
 326                        PCREL (opcode->arg[an]),
 327                        pending_reloc ? pending_reloc : c_to_r (opcode->arg[an]));
 328
 329           idx += ASIZE (opcode->arg[an]);
 330           pending_reloc = 0;
 331         }
 332
 333       while (ISSPACE (*op_end))
 334         op_end++;
 335
 336       if (*op_end != 0)
 337         as_warn ("extra stuff on line ignored");
 338
 339     }
 340
 341   if (pending_reloc)
 342     as_bad ("Something forgot to clean up\n");
 343
 344 }
 345
 346 /* Turn a string in input_line_pointer into a floating point constant
 347    of type type, and store the appropriate bytes in *LITP.  The number
 348    of LITTLENUMS emitted is stored in *SIZEP .  An error message is
 349    returned, or NULL on OK.  */
 350
 351 char *
 352 md_atof (type, litP, sizeP)
 353      int type;
 354      char *litP;
 355      int *sizeP;
 356 {
 357   int prec;
 358   LITTLENUM_TYPE words[4];
 359   char *t;
 360   int i;
 361
 362   switch (type)
 363     {
 364     case 'f':
 365       prec = 2;
 366       break;
 367
 368     case 'd':
 369       prec = 4;
 370       break;
 371
 372     default:
 373       *sizeP = 0;
 374       return _("bad call to md_atof");
 375     }
 376
 377   t = atof_ieee (input_line_pointer, type, words);
 378   if (t)
 379     input_line_pointer = t;
 380
 381   *sizeP = prec * 2;
 382
 383   if (!target_big_endian)
 384     {
 385       for (i = prec - 1; i >= 0; i--)
 386         {
 387           md_number_to_chars (litP, (valueT) words[i], 2);
 388           litP += 2;
 389         }
 390     }
 391   else
 392     {
 393       for (i = 0; i < prec; i++)
 394         {
 395           md_number_to_chars (litP, (valueT) words[i], 2);
 396           litP += 2;
 397         }
 398     }
 399
 400   return NULL;
 401 }
 402 \f
 403 const char *md_shortopts = "";
 404
 405 struct option md_longopts[] = {
 406
 407 #define OPTION_LITTLE (OPTION_MD_BASE)
 408 #define OPTION_BIG    (OPTION_LITTLE + 1)
 409
 410   {"little", no_argument, NULL, OPTION_LITTLE},
 411   {"big", no_argument, NULL, OPTION_BIG},
 412   {NULL, no_argument, NULL, 0}
 413 };
 414 size_t md_longopts_size = sizeof (md_longopts);
 415
 416 int
 417 md_parse_option (c, arg)
 418      int c;
 419      char *arg ATTRIBUTE_UNUSED;
 420 {
 421   switch (c)
 422     {
 423     case OPTION_LITTLE:
 424       little (0);
 425       break;
 426     case OPTION_BIG:
 427       big (0);
 428       break;
 429     default:
 430       return 0;
 431     }
 432   return 1;
 433 }
 434
 435 void
 436 md_show_usage (stream)
 437      FILE *stream;
 438 {
 439   fprintf (stream, _("\
 440 PJ options:\n\
 441 -little                 generate little endian code\n\
 442 -big                    generate big endian code\n"));
 443 }
 444
 445 /* Apply a fixup to the object file.  */
 446
 447 void
 448 md_apply_fix3 (fixP, valP, seg)
 449      fixS *fixP;
 450      valueT * valP;
 451      segT seg ATTRIBUTE_UNUSED;
 452 {
 453   char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
 454   long val = *valP;
 455   long max, min;
 456   int shift;
 457
 458   max = min = 0;
 459   shift = 0;
 460   switch (fixP->fx_r_type)
 461     {
 462     case BFD_RELOC_VTABLE_INHERIT:
 463     case BFD_RELOC_VTABLE_ENTRY:
 464       fixP->fx_done = 0;
 465       return;
 466
 467     case BFD_RELOC_PJ_CODE_REL16:
 468       if (val < -0x8000 || val >= 0x7fff)
 469         as_bad_where (fixP->fx_file, fixP->fx_line, _("pcrel too far"));
 470       buf[0] |= (val >> 8) & 0xff;
 471       buf[1] = val & 0xff;
 472       break;
 473
 474     case BFD_RELOC_PJ_CODE_HI16:
 475       *buf++ = val >> 24;
 476       *buf++ = val >> 16;
 477       fixP->fx_addnumber = val & 0xffff;
 478       break;
 479
 480     case BFD_RELOC_PJ_CODE_DIR16:
 481     case BFD_RELOC_PJ_CODE_LO16:
 482       *buf++ = val >> 8;
 483       *buf++ = val >> 0;
 484
 485       max = 0xffff;
 486       min = -0xffff;
 487       break;
 488
 489     case BFD_RELOC_8:
 490       max = 0xff;
 491       min = -0xff;
 492       *buf++ = val;
 493       break;
 494
 495     case BFD_RELOC_PJ_CODE_DIR32:
 496       *buf++ = val >> 24;
 497       *buf++ = val >> 16;
 498       *buf++ = val >> 8;
 499       *buf++ = val >> 0;
 500       break;
 501
 502     case BFD_RELOC_32:
 503       if (target_big_endian)
 504         {
 505           *buf++ = val >> 24;
 506           *buf++ = val >> 16;
 507           *buf++ = val >> 8;
 508           *buf++ = val >> 0;
 509         }
 510       else
 511         {
 512           *buf++ = val >> 0;
 513           *buf++ = val >> 8;
 514           *buf++ = val >> 16;
 515           *buf++ = val >> 24;
 516         }
 517       break;
 518
 519     case BFD_RELOC_16:
 520       if (target_big_endian)
 521         {
 522           *buf++ = val >> 8;
 523           *buf++ = val >> 0;
 524         }
 525       else
 526         {
 527           *buf++ = val >> 0;
 528           *buf++ = val >> 8;
 529         }
 530       break;
 531
 532     default:
 533       abort ();
 534     }
 535
 536   if (max != 0 && (val < min || val > max))
 537     as_bad_where (fixP->fx_file, fixP->fx_line, _("offset out of range"));
 538
 539   if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
 540     fixP->fx_done = 1;
 541 }
 542
 543 /* Put number into target byte order.  Always put values in an
 544    executable section into big endian order.  */
 545
 546 void
 547 md_number_to_chars (ptr, use, nbytes)
 548      char *ptr;
 549      valueT use;
 550      int nbytes;
 551 {
 552   if (target_big_endian || now_seg->flags & SEC_CODE)
 553     number_to_chars_bigendian (ptr, use, nbytes);
 554   else
 555     number_to_chars_littleendian (ptr, use, nbytes);
 556 }
 557
 558 /* Translate internal representation of relocation info to BFD target
 559    format.  */
 560
 561 arelent *
 562 tc_gen_reloc (section, fixp)
 563      asection *section ATTRIBUTE_UNUSED;
 564      fixS *fixp;
 565 {
 566   arelent *rel;
 567   bfd_reloc_code_real_type r_type;
 568
 569   rel = (arelent *) xmalloc (sizeof (arelent));
 570   rel->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
 571   *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
 572   rel->address = fixp->fx_frag->fr_address + fixp->fx_where;
 573
 574   r_type = fixp->fx_r_type;
 575   rel->addend = fixp->fx_addnumber;
 576   rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);
 577
 578   if (rel->howto == NULL)
 579     {
 580       as_bad_where (fixp->fx_file, fixp->fx_line,
 581                     _("Cannot represent relocation type %s"),
 582                     bfd_get_reloc_code_name (r_type));
 583       /* Set howto to a garbage value so that we can keep going.  */
 584       rel->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_32);
 585       assert (rel->howto != NULL);
 586     }
 587
 588   return rel;
 589 }