gas/config/tc-mt.c

   1 /* tc-mt.c -- Assembler for the Morpho Technologies mt .
   2    Copyright (C) 2005 Free Software Foundation.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <stdio.h>
  22 #include "as.h"
  23 #include "dwarf2dbg.h"
  24 #include "subsegs.h"
  25 #include "symcat.h"
  26 #include "opcodes/mt-desc.h"
  27 #include "opcodes/mt-opc.h"
  28 #include "cgen.h"
  29 #include "elf/common.h"
  30 #include "elf/mt.h"
  31 #include "libbfd.h"
  32
  33 /* Structure to hold all of the different components
  34    describing an individual instruction.  */
  35 typedef struct
  36 {
  37   const CGEN_INSN *     insn;
  38   const CGEN_INSN *     orig_insn;
  39   CGEN_FIELDS           fields;
  40 #if CGEN_INT_INSN_P
  41   CGEN_INSN_INT         buffer [1];
  42 #define INSN_VALUE(buf) (*(buf))
  43 #else
  44   unsigned char         buffer [CGEN_MAX_INSN_SIZE];
  45 #define INSN_VALUE(buf) (buf)
  46 #endif
  47   char *                addr;
  48   fragS *               frag;
  49   int                   num_fixups;
  50   fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
  51   int                   indices [MAX_OPERAND_INSTANCES];
  52 }
  53 mt_insn;
  54
  55
  56 const char comment_chars[]        = ";";
  57 const char line_comment_chars[]   = "#";
  58 const char line_separator_chars[] = "";
  59 const char EXP_CHARS[]            = "eE";
  60 const char FLT_CHARS[]            = "dD";
  61
  62 /* The target specific pseudo-ops which we support.  */
  63 const pseudo_typeS md_pseudo_table[] =
  64 {
  65     { "word",   cons,                   4 },
  66     { NULL,     NULL,                   0 }
  67 };
  68
  69 \f
  70
  71 static int no_scheduling_restrictions = 0;
  72
  73 struct option md_longopts[] =
  74 {
  75 #define OPTION_NO_SCHED_REST    (OPTION_MD_BASE)
  76   { "nosched",     no_argument, NULL, OPTION_NO_SCHED_REST },
  77 #define OPTION_MARCH            (OPTION_MD_BASE + 1)
  78   { "march", required_argument, NULL, OPTION_MARCH},
  79   { NULL,          no_argument, NULL, 0 },
  80 };
  81 size_t md_longopts_size = sizeof (md_longopts);
  82
  83 const char * md_shortopts = "";
  84
  85 /* Mach selected from command line.  */
  86 static int mt_mach = bfd_mach_ms1;
  87 static unsigned mt_mach_bitmask = 1 << MACH_MS1;
  88
  89 /* Flags to set in the elf header */
  90 static flagword mt_flags = EF_MT_CPU_MRISC;
  91
  92 /* The architecture to use.  */
  93 enum mt_architectures
  94   {
  95     ms1_64_001,
  96     ms1_16_002,
  97     ms1_16_003,
  98     ms2
  99   };
 100
 101 /* MT architecture we are using for this output file.  */
 102 static enum mt_architectures mt_arch = ms1_16_002;
 103
 104 int
 105 md_parse_option (int c ATTRIBUTE_UNUSED, char * arg)
 106 {
 107   switch (c)
 108     {
 109     case OPTION_MARCH:
 110       if (strcmp (arg, "ms1-64-001") == 0)
 111         {
 112           mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC;
 113           mt_mach = bfd_mach_ms1;
 114           mt_mach_bitmask = 1 << MACH_MS1;
 115           mt_arch = ms1_64_001;
 116         }
 117       else if (strcmp (arg, "ms1-16-002") == 0)
 118         {
 119           mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC;
 120           mt_mach = bfd_mach_ms1;
 121           mt_mach_bitmask = 1 << MACH_MS1;
 122           mt_arch = ms1_16_002;
 123         }
 124       else if (strcmp (arg, "ms1-16-003") == 0)
 125         {
 126           mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MRISC2;
 127           mt_mach = bfd_mach_mrisc2;
 128           mt_mach_bitmask = 1 << MACH_MS1_003;
 129           mt_arch = ms1_16_003;
 130         }
 131       else if (strcmp (arg, "ms2") == 0)
 132         {
 133           mt_flags = (mt_flags & ~EF_MT_CPU_MASK) | EF_MT_CPU_MS2;
 134           mt_mach = bfd_mach_mrisc2;
 135           mt_mach_bitmask = 1 << MACH_MS2;
 136           mt_arch = ms2;
 137         }
 138     case OPTION_NO_SCHED_REST:
 139       no_scheduling_restrictions = 1;
 140       break;
 141     default:
 142       return 0;
 143     }
 144
 145   return 1;
 146 }
 147
 148
 149 void
 150 md_show_usage (FILE * stream)
 151 {
 152   fprintf (stream, _("MT specific command line options:\n"));
 153   fprintf (stream, _("  -march=ms1-64-001         allow ms1-64-001 instructions\n"));
 154   fprintf (stream, _("  -march=ms1-16-002         allow ms1-16-002 instructions (default)\n"));
 155   fprintf (stream, _("  -march=ms1-16-003         allow ms1-16-003 instructions\n"));
 156   fprintf (stream, _("  -march=ms2                allow ms2 instructions \n"));
 157   fprintf (stream, _("  -nosched                  disable scheduling restrictions\n"));
 158 }
 159
 160 \f
 161 void
 162 md_begin (void)
 163 {
 164   /* Initialize the `cgen' interface.  */
 165
 166   /* Set the machine number and endian.  */
 167   gas_cgen_cpu_desc = mt_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, mt_mach_bitmask,
 168                                         CGEN_CPU_OPEN_ENDIAN,
 169                                         CGEN_ENDIAN_BIG,
 170                                         CGEN_CPU_OPEN_END);
 171   mt_cgen_init_asm (gas_cgen_cpu_desc);
 172
 173   /* This is a callback from cgen to gas to parse operands.  */
 174   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 175
 176   /* Set the ELF flags if desired. */
 177   if (mt_flags)
 178     bfd_set_private_flags (stdoutput, mt_flags);
 179
 180   /* Set the machine type.  */
 181   bfd_default_set_arch_mach (stdoutput, bfd_arch_mt, mt_mach);
 182 }
 183
 184 void
 185 md_assemble (char * str)
 186 {
 187   static long delayed_load_register = 0;
 188   static long prev_delayed_load_register = 0;
 189   static int last_insn_had_delay_slot = 0;
 190   static int last_insn_in_noncond_delay_slot = 0;
 191   static int last_insn_has_load_delay = 0;
 192   static int last_insn_was_memory_access = 0;
 193   static int last_insn_was_io_insn = 0;
 194   static int last_insn_was_arithmetic_or_logic = 0;
 195   static int last_insn_was_branch_insn = 0;
 196   static int last_insn_was_conditional_branch_insn = 0;
 197
 198   mt_insn insn;
 199   char * errmsg;
 200
 201   /* Initialize GAS's cgen interface for a new instruction.  */
 202   gas_cgen_init_parse ();
 203
 204   insn.insn = mt_cgen_assemble_insn
 205       (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 206
 207   if (!insn.insn)
 208     {
 209       as_bad ("%s", errmsg);
 210       return;
 211     }
 212
 213   /* Doesn't really matter what we pass for RELAX_P here.  */
 214   gas_cgen_finish_insn (insn.insn, insn.buffer,
 215                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 216
 217
 218   /* Handle Scheduling Restrictions.  */
 219   if (!no_scheduling_restrictions)
 220     {
 221       /* Detect consecutive Memory Accesses.  */
 222       if (last_insn_was_memory_access
 223           && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS)
 224           && mt_mach == ms1_64_001)
 225         as_warn (_("instruction %s may not follow another memory access instruction."),
 226                  CGEN_INSN_NAME (insn.insn));
 227
 228       /* Detect consecutive I/O Instructions.  */
 229       else if (last_insn_was_io_insn
 230                && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN))
 231         as_warn (_("instruction %s may not follow another I/O instruction."),
 232                  CGEN_INSN_NAME (insn.insn));
 233
 234       /* Detect consecutive branch instructions.  */
 235       else if (last_insn_was_branch_insn
 236                && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN))
 237         as_warn (_("%s may not occupy the delay slot of another branch insn."),
 238                  CGEN_INSN_NAME (insn.insn));
 239
 240       /* Detect data dependencies on delayed loads: memory and input insns.  */
 241       if (last_insn_has_load_delay && delayed_load_register)
 242         {
 243           if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
 244               && insn.fields.f_sr1 == delayed_load_register)
 245             as_warn (_("operand references R%ld of previous load."),
 246                      insn.fields.f_sr1);
 247
 248           if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
 249               && insn.fields.f_sr2 == delayed_load_register)
 250             as_warn (_("operand references R%ld of previous load."),
 251                      insn.fields.f_sr2);
 252         }
 253
 254       /* Detect JAL/RETI hazard */
 255       if (mt_mach == ms2
 256           && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_JAL_HAZARD))
 257         {
 258           if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
 259                && insn.fields.f_sr1 == delayed_load_register)
 260               || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
 261                   && insn.fields.f_sr2 == delayed_load_register))
 262             as_warn (_("operand references R%ld of previous instrutcion."),
 263                      delayed_load_register);
 264           else if ((CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
 265                     && insn.fields.f_sr1 == prev_delayed_load_register)
 266                    || (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
 267                        && insn.fields.f_sr2 == prev_delayed_load_register))
 268             as_warn (_("operand references R%ld of instructcion before previous."),
 269                      prev_delayed_load_register);
 270         }
 271
 272       /* Detect data dependency between conditional branch instruction
 273          and an immediately preceding arithmetic or logical instruction.  */
 274       if (last_insn_was_arithmetic_or_logic
 275           && !last_insn_in_noncond_delay_slot
 276           && (delayed_load_register != 0)
 277           && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN)
 278           && mt_arch == ms1_64_001)
 279         {
 280           if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR1)
 281               && insn.fields.f_sr1 == delayed_load_register)
 282             as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."),
 283                      insn.fields.f_sr1);
 284
 285           if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2)
 286               && insn.fields.f_sr2 == delayed_load_register)
 287             as_warn (_("conditional branch or jal insn's operand references R%ld of previous arithmetic or logic insn."),
 288                      insn.fields.f_sr2);
 289         }
 290     }
 291
 292   /* Keep track of details of this insn for processing next insn.  */
 293   last_insn_in_noncond_delay_slot = last_insn_was_branch_insn
 294     && !last_insn_was_conditional_branch_insn;
 295
 296   last_insn_had_delay_slot =
 297     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
 298
 299   last_insn_has_load_delay =
 300     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_LOAD_DELAY);
 301
 302   last_insn_was_memory_access =
 303     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MEMORY_ACCESS);
 304
 305   last_insn_was_io_insn =
 306     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_IO_INSN);
 307
 308   last_insn_was_arithmetic_or_logic =
 309     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_AL_INSN);
 310
 311   last_insn_was_branch_insn =
 312     CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN);
 313
 314   last_insn_was_conditional_branch_insn =
 315   CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_BR_INSN)
 316     && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRSR2);
 317
 318   prev_delayed_load_register = delayed_load_register;
 319
 320   if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDR))
 321      delayed_load_register = insn.fields.f_dr;
 322   else if (CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_USES_FRDRRR))
 323      delayed_load_register = insn.fields.f_drrr;
 324   else  /* Insns has no destination register.  */
 325      delayed_load_register = 0;
 326
 327   /* Generate dwarf2 line numbers.  */
 328   dwarf2_emit_insn (4);
 329 }
 330
 331 valueT
 332 md_section_align (segT segment, valueT size)
 333 {
 334   int align = bfd_get_section_alignment (stdoutput, segment);
 335
 336   return ((size + (1 << align) - 1) & (-1 << align));
 337 }
 338
 339 symbolS *
 340 md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
 341 {
 342     return NULL;
 343 }
 344 \f
 345 int
 346 md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
 347                                segT    segment ATTRIBUTE_UNUSED)
 348 {
 349   as_fatal (_("md_estimate_size_before_relax\n"));
 350   return 1;
 351 }
 352
 353 /* *fragP has been relaxed to its final size, and now needs to have
 354    the bytes inside it modified to conform to the new size.
 355
 356    Called after relaxation is finished.
 357    fragP->fr_type == rs_machine_dependent.
 358    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 359
 360 void
 361 md_convert_frag (bfd   * abfd  ATTRIBUTE_UNUSED,
 362                  segT    sec   ATTRIBUTE_UNUSED,
 363                  fragS * fragP ATTRIBUTE_UNUSED)
 364 {
 365 }
 366
 367 \f
 368 /* Functions concerning relocs.  */
 369
 370 long
 371 md_pcrel_from_section (fixS *fixP, segT sec)
 372 {
 373   if (fixP->fx_addsy != (symbolS *) NULL
 374       && (!S_IS_DEFINED (fixP->fx_addsy)
 375           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 376     /* The symbol is undefined (or is defined but not in this section).
 377        Let the linker figure it out.  */
 378     return 0;
 379
 380   /* Return the address of the opcode - cgen adjusts for opcode size
 381      itself, to be consistent with the disassembler, which must do
 382      so.  */
 383   return fixP->fx_where + fixP->fx_frag->fr_address;
 384 }
 385
 386
 387 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 388    Returns BFD_RELOC_NONE if no reloc type can be found.
 389    *FIXP may be modified if desired.  */
 390
 391 bfd_reloc_code_real_type
 392 md_cgen_lookup_reloc (const CGEN_INSN *    insn     ATTRIBUTE_UNUSED,
 393                       const CGEN_OPERAND * operand,
 394                       fixS *               fixP     ATTRIBUTE_UNUSED)
 395 {
 396   bfd_reloc_code_real_type result;
 397
 398   result = BFD_RELOC_NONE;
 399
 400   switch (operand->type)
 401     {
 402     case MT_OPERAND_IMM16O:
 403       result = BFD_RELOC_16_PCREL;
 404       fixP->fx_pcrel = 1;
 405       /* fixP->fx_no_overflow = 1; */
 406       break;
 407     case MT_OPERAND_IMM16:
 408     case MT_OPERAND_IMM16Z:
 409       /* These may have been processed at parse time.  */
 410       if (fixP->fx_cgen.opinfo != 0)
 411         result = fixP->fx_cgen.opinfo;
 412       fixP->fx_no_overflow = 1;
 413       break;
 414     case MT_OPERAND_LOOPSIZE:
 415       result = BFD_RELOC_MT_PCINSN8;
 416       fixP->fx_pcrel = 1;
 417       /* Adjust for the delay slot, which is not part of the loop  */
 418       fixP->fx_offset -= 8;
 419       break;
 420     default:
 421       result = BFD_RELOC_NONE;
 422       break;
 423     }
 424
 425   return result;
 426 }
 427
 428 /* Write a value out to the object file, using the appropriate endianness.  */
 429
 430 void
 431 md_number_to_chars (char * buf, valueT val, int n)
 432 {
 433   number_to_chars_bigendian (buf, val, n);
 434 }
 435
 436 /* Turn a string in input_line_pointer into a floating point constant of type
 437    type, and store the appropriate bytes in *litP.  The number of LITTLENUMS
 438    emitted is stored in *sizeP .  An error message is returned, or NULL on OK.  */
 439
 440 /* Equal to MAX_PRECISION in atof-ieee.c.  */
 441 #define MAX_LITTLENUMS 6
 442
 443 char *
 444 md_atof (type, litP, sizeP)
 445      char   type;
 446      char * litP;
 447      int *  sizeP;
 448 {
 449   int              prec;
 450   LITTLENUM_TYPE   words [MAX_LITTLENUMS];
 451   LITTLENUM_TYPE * wordP;
 452   char *           t;
 453
 454   switch (type)
 455     {
 456     case 'f':
 457     case 'F':
 458     case 's':
 459     case 'S':
 460       prec = 2;
 461       break;
 462
 463     case 'd':
 464     case 'D':
 465     case 'r':
 466     case 'R':
 467       prec = 4;
 468       break;
 469
 470    /* FIXME: Some targets allow other format chars for bigger sizes here.  */
 471
 472     default:
 473       * sizeP = 0;
 474       return _("Bad call to md_atof()");
 475     }
 476
 477   t = atof_ieee (input_line_pointer, type, words);
 478   if (t)
 479     input_line_pointer = t;
 480   * sizeP = prec * sizeof (LITTLENUM_TYPE);
 481
 482   /* This loops outputs the LITTLENUMs in REVERSE order;
 483      in accord with the mt endianness.  */
 484   for (wordP = words; prec--;)
 485     {
 486       md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
 487       litP += sizeof (LITTLENUM_TYPE);
 488     }
 489
 490   return 0;
 491 }
 492
 493 /* See whether we need to force a relocation into the output file.  */
 494
 495 int
 496 mt_force_relocation (fixS * fixp ATTRIBUTE_UNUSED)
 497 {
 498   return 0;
 499 }
 500
 501 void
 502 mt_apply_fix (fixS *fixP, valueT *valueP, segT seg)
 503 {
 504   if ((fixP->fx_pcrel != 0) && (fixP->fx_r_type == BFD_RELOC_32))
 505     fixP->fx_r_type = BFD_RELOC_32_PCREL;
 506
 507   gas_cgen_md_apply_fix (fixP, valueP, seg);
 508 }
 509
 510 bfd_boolean
 511 mt_fix_adjustable (fixS * fixP)
 512 {
 513   bfd_reloc_code_real_type reloc_type;
 514
 515   if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
 516     {
 517       const CGEN_INSN *insn = NULL;
 518       int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
 519       const CGEN_OPERAND *operand;
 520
 521       operand = cgen_operand_lookup_by_num(gas_cgen_cpu_desc, opindex);
 522       reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
 523     }
 524   else
 525     reloc_type = fixP->fx_r_type;
 526
 527   if (fixP->fx_addsy == NULL)
 528     return TRUE;
 529
 530   /* Prevent all adjustments to global symbols.  */
 531   if (S_IS_EXTERNAL (fixP->fx_addsy))
 532     return FALSE;
 533
 534   if (S_IS_WEAK (fixP->fx_addsy))
 535     return FALSE;
 536
 537   return 1;
 538 }