gas/config/tc-fr30.c

   1 /* tc-fr30.c -- Assembler for the Fujitsu FR30.
   2    Copyright (C) 1998-2019 Free Software Foundation, Inc.
   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 3, 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, 51 Franklin Street - Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #include "as.h"
  22 #include "safe-ctype.h"
  23 #include "subsegs.h"
  24 #include "symcat.h"
  25 #include "opcodes/fr30-desc.h"
  26 #include "opcodes/fr30-opc.h"
  27 #include "cgen.h"
  28
  29 /* Structure to hold all of the different components describing
  30    an individual instruction.  */
  31 typedef struct
  32 {
  33   const CGEN_INSN *     insn;
  34   const CGEN_INSN *     orig_insn;
  35   CGEN_FIELDS           fields;
  36 #if CGEN_INT_INSN_P
  37   CGEN_INSN_INT         buffer [1];
  38 #define INSN_VALUE(buf) (*(buf))
  39 #else
  40   unsigned char         buffer [CGEN_MAX_INSN_SIZE];
  41 #define INSN_VALUE(buf) (buf)
  42 #endif
  43   char *                addr;
  44   fragS *               frag;
  45   int                   num_fixups;
  46   fixS *                fixups [GAS_CGEN_MAX_FIXUPS];
  47   int                   indices [MAX_OPERAND_INSTANCES];
  48 }
  49 fr30_insn;
  50
  51 const char comment_chars[]        = ";";
  52 const char line_comment_chars[]   = "#";
  53 const char line_separator_chars[] = "|";
  54 const char EXP_CHARS[]            = "eE";
  55 const char FLT_CHARS[]            = "dD";
  56 \f
  57 #define FR30_SHORTOPTS ""
  58 const char * md_shortopts = FR30_SHORTOPTS;
  59
  60 struct option md_longopts[] =
  61 {
  62   {NULL, no_argument, NULL, 0}
  63 };
  64 size_t md_longopts_size = sizeof (md_longopts);
  65
  66 int
  67 md_parse_option (int c ATTRIBUTE_UNUSED,
  68                  const char *arg ATTRIBUTE_UNUSED)
  69 {
  70   switch (c)
  71     {
  72     default:
  73       return 0;
  74     }
  75   return 1;
  76 }
  77
  78 void
  79 md_show_usage (FILE * stream)
  80 {
  81   fprintf (stream, _(" FR30 specific command line options:\n"));
  82 }
  83
  84 /* The target specific pseudo-ops which we support.  */
  85 const pseudo_typeS md_pseudo_table[] =
  86 {
  87   { "word",     cons,           4 },
  88   { NULL,       NULL,           0 }
  89 };
  90
  91 \f
  92 void
  93 md_begin (void)
  94 {
  95   /* Initialize the `cgen' interface.  */
  96
  97   /* Set the machine number and endian.  */
  98   gas_cgen_cpu_desc = fr30_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
  99                                           CGEN_CPU_OPEN_ENDIAN,
 100                                           CGEN_ENDIAN_BIG,
 101                                           CGEN_CPU_OPEN_END);
 102   fr30_cgen_init_asm (gas_cgen_cpu_desc);
 103
 104   /* This is a callback from cgen to gas to parse operands.  */
 105   cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
 106 }
 107
 108 void
 109 md_assemble (char *str)
 110 {
 111   static int last_insn_had_delay_slot = 0;
 112   fr30_insn insn;
 113   char *errmsg;
 114
 115   /* Initialize GAS's cgen interface for a new instruction.  */
 116   gas_cgen_init_parse ();
 117
 118   insn.insn = fr30_cgen_assemble_insn
 119     (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
 120
 121   if (!insn.insn)
 122     {
 123       as_bad ("%s", errmsg);
 124       return;
 125     }
 126
 127   /* Doesn't really matter what we pass for RELAX_P here.  */
 128   gas_cgen_finish_insn (insn.insn, insn.buffer,
 129                         CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
 130
 131   /* Warn about invalid insns in delay slots.  */
 132   if (last_insn_had_delay_slot
 133       && CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_NOT_IN_DELAY_SLOT))
 134     as_warn (_("Instruction %s not allowed in a delay slot."),
 135              CGEN_INSN_NAME (insn.insn));
 136
 137   last_insn_had_delay_slot
 138     = CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_DELAY_SLOT);
 139 }
 140
 141 /* The syntax in the manual says constants begin with '#'.
 142    We just ignore it.  */
 143
 144 void
 145 md_operand (expressionS * expressionP)
 146 {
 147   if (* input_line_pointer == '#')
 148     {
 149       input_line_pointer ++;
 150       expression (expressionP);
 151     }
 152 }
 153
 154 valueT
 155 md_section_align (segT segment, valueT size)
 156 {
 157   int align = bfd_get_section_alignment (stdoutput, segment);
 158
 159   return ((size + (1 << align) - 1) & -(1 << align));
 160 }
 161
 162 symbolS *
 163 md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
 164 {
 165   return NULL;
 166 }
 167 \f
 168 /* Interface to relax_segment.  */
 169
 170 /* FIXME: Build table by hand, get it working, then machine generate.  */
 171
 172 const relax_typeS md_relax_table[] =
 173 {
 174 /* The fields are:
 175    1) most positive reach of this state,
 176    2) most negative reach of this state,
 177    3) how many bytes this mode will add to the size of the current frag
 178    4) which index into the table to try if we can't fit into this one.  */
 179
 180   /* The first entry must be unused because an `rlx_more' value of zero ends
 181      each list.  */
 182   {1, 1, 0, 0},
 183
 184   /* The displacement used by GAS is from the end of the 2 byte insn,
 185      so we subtract 2 from the following.  */
 186   /* 16 bit insn, 8 bit disp -> 10 bit range.
 187      This doesn't handle a branch in the right slot at the border:
 188      the "& -4" isn't taken into account.  It's not important enough to
 189      complicate things over it, so we subtract an extra 2 (or + 2 in -ve
 190      case).  */
 191   {511 - 2 - 2, -512 - 2 + 2, 0, 2 },
 192   /* 32 bit insn, 24 bit disp -> 26 bit range.  */
 193   {0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
 194   /* Same thing, but with leading nop for alignment.  */
 195   {0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
 196 };
 197
 198 /* Return an initial guess of the length by which a fragment must grow to
 199    hold a branch to reach its destination.
 200    Also updates fr_type/fr_subtype as necessary.
 201
 202    Called just before doing relaxation.
 203    Any symbol that is now undefined will not become defined.
 204    The guess for fr_var is ACTUALLY the growth beyond fr_fix.
 205    Whatever we do to grow fr_fix or fr_var contributes to our returned value.
 206    Although it may not be explicit in the frag, pretend fr_var starts with a
 207    0 value.  */
 208
 209 int
 210 md_estimate_size_before_relax (fragS * fragP, segT segment)
 211 {
 212   /* The only thing we have to handle here are symbols outside of the
 213      current segment.  They may be undefined or in a different segment in
 214      which case linker scripts may place them anywhere.
 215      However, we can't finish the fragment here and emit the reloc as insn
 216      alignment requirements may move the insn about.  */
 217
 218   if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
 219     {
 220       /* The symbol is undefined in this segment.
 221          Change the relaxation subtype to the max allowable and leave
 222          all further handling to md_convert_frag.  */
 223       fragP->fr_subtype = 2;
 224
 225       {
 226         const CGEN_INSN * insn;
 227         int               i;
 228
 229         /* Update the recorded insn.
 230            Fortunately we don't have to look very far.
 231            FIXME: Change this to record in the instruction the next higher
 232            relaxable insn to use.  */
 233         for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
 234           {
 235             if ((strcmp (CGEN_INSN_MNEMONIC (insn),
 236                          CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
 237                  == 0)
 238                 && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED))
 239               break;
 240           }
 241         if (i == 4)
 242           abort ();
 243
 244         fragP->fr_cgen.insn = insn;
 245         return 2;
 246       }
 247     }
 248
 249   /* Return the size of the variable part of the frag.  */
 250   return md_relax_table[fragP->fr_subtype].rlx_length;
 251 }
 252
 253 /* *fragP has been relaxed to its final size, and now needs to have
 254    the bytes inside it modified to conform to the new size.
 255
 256    Called after relaxation is finished.
 257    fragP->fr_type == rs_machine_dependent.
 258    fragP->fr_subtype is the subtype of what the address relaxed to.  */
 259
 260 void
 261 md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
 262                  segT sec ATTRIBUTE_UNUSED,
 263                  fragS *fragP ATTRIBUTE_UNUSED)
 264 {
 265 }
 266 \f
 267 /* Functions concerning relocs.  */
 268
 269 /* The location from which a PC relative jump should be calculated,
 270    given a PC relative reloc.  */
 271
 272 long
 273 md_pcrel_from_section (fixS * fixP, segT sec)
 274 {
 275   if (fixP->fx_addsy != (symbolS *) NULL
 276       && (! S_IS_DEFINED (fixP->fx_addsy)
 277           || S_GET_SEGMENT (fixP->fx_addsy) != sec))
 278     /* The symbol is undefined (or is defined but not in this section).
 279        Let the linker figure it out.  */
 280     return 0;
 281
 282   return (fixP->fx_frag->fr_address + fixP->fx_where) & ~1;
 283 }
 284
 285 /* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
 286    Returns BFD_RELOC_NONE if no reloc type can be found.
 287    *FIXP may be modified if desired.  */
 288
 289 bfd_reloc_code_real_type
 290 md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,
 291                       const CGEN_OPERAND *operand,
 292                       fixS *fixP)
 293 {
 294   switch (operand->type)
 295     {
 296     case FR30_OPERAND_LABEL9:  fixP->fx_pcrel = 1; return BFD_RELOC_FR30_9_PCREL;
 297     case FR30_OPERAND_LABEL12: fixP->fx_pcrel = 1; return BFD_RELOC_FR30_12_PCREL;
 298     case FR30_OPERAND_DISP10:  return BFD_RELOC_FR30_10_IN_8;
 299     case FR30_OPERAND_DISP9:   return BFD_RELOC_FR30_9_IN_8;
 300     case FR30_OPERAND_DISP8:   return BFD_RELOC_FR30_8_IN_8;
 301     case FR30_OPERAND_UDISP6:  return BFD_RELOC_FR30_6_IN_4;
 302     case FR30_OPERAND_I8:      return BFD_RELOC_8;
 303     case FR30_OPERAND_I32:     return BFD_RELOC_FR30_48;
 304     case FR30_OPERAND_I20:     return BFD_RELOC_FR30_20;
 305     default : /* Avoid -Wall warning.  */
 306       break;
 307     }
 308
 309   return BFD_RELOC_NONE;
 310 }
 311 \f
 312 /* Write a value out to the object file, using the appropriate endianness.  */
 313
 314 void
 315 md_number_to_chars (char * buf, valueT val, int n)
 316 {
 317   number_to_chars_bigendian (buf, val, n);
 318 }
 319
 320 const char *
 321 md_atof (int type, char * litP, int * sizeP)
 322 {
 323   return ieee_md_atof (type, litP, sizeP, TRUE);
 324 }
 325
 326 /* Worker function for fr30_is_colon_insn().  */
 327 static int
 328 restore_colon (char *next_i_l_p, char *nul_char)
 329 {
 330   /* Restore the colon, and advance input_line_pointer to
 331      the end of the new symbol.  */
 332   *input_line_pointer = *nul_char;
 333   input_line_pointer = next_i_l_p;
 334   *nul_char = *next_i_l_p;
 335   *next_i_l_p = 0;
 336   return 1;
 337 }
 338
 339 /* Determines if the symbol starting at START and ending in
 340    a colon that was at the location pointed to by INPUT_LINE_POINTER
 341    (but which has now been replaced bu a NUL) is in fact an
 342    LDI:8, LDI:20, LDI:32, CALL:D. JMP:D, RET:D or Bcc:D instruction.
 343    If it is, then it restores the colon, advances INPUT_LINE_POINTER
 344    to the real end of the instruction/symbol, saves the char there to
 345    NUL_CHAR and pokes a NUL, and returns 1.  Otherwise it returns 0.  */
 346 int
 347 fr30_is_colon_insn (char *start, char *nul_char)
 348 {
 349   char * i_l_p = input_line_pointer;
 350
 351   if (*nul_char == '"')
 352     ++i_l_p;
 353
 354   /* Check to see if the symbol parsed so far is 'ldi'.  */
 355   if (   (start[0] != 'l' && start[0] != 'L')
 356       || (start[1] != 'd' && start[1] != 'D')
 357       || (start[2] != 'i' && start[2] != 'I')
 358       || start[3] != 0)
 359     {
 360       /* Nope - check to see a 'd' follows the colon.  */
 361       if (   (i_l_p[1] == 'd' || i_l_p[1] == 'D')
 362           && (i_l_p[2] == ' ' || i_l_p[2] == '\t' || i_l_p[2] == '\n'))
 363         {
 364           /* Yup - it might be delay slot instruction.  */
 365           int           i;
 366           static const char * delay_insns [] =
 367           {
 368             "call", "jmp", "ret", "bra", "bno",
 369             "beq",  "bne", "bc",  "bnc", "bn",
 370             "bp",   "bv",  "bnv", "blt", "bge",
 371             "ble",  "bgt", "bls", "bhi"
 372           };
 373
 374           for (i = sizeof (delay_insns) / sizeof (delay_insns[0]); i--;)
 375             {
 376               const char * insn = delay_insns[i];
 377               int    len  = strlen (insn);
 378
 379               if (start [len] != 0)
 380                 continue;
 381
 382               while (len --)
 383                 if (TOLOWER (start [len]) != insn [len])
 384                   break;
 385
 386               if (len == -1)
 387                 return restore_colon (i_l_p + 1, nul_char);
 388             }
 389         }
 390
 391       /* Nope - it is a normal label.  */
 392       return 0;
 393     }
 394
 395   /* Check to see if the text following the colon is '8'.  */
 396   if (i_l_p[1] == '8' && (i_l_p[2] == ' ' || i_l_p[2] == '\t'))
 397     return restore_colon (i_l_p + 2, nul_char);
 398
 399   /* Check to see if the text following the colon is '20'.  */
 400   else if (i_l_p[1] == '2' && i_l_p[2] =='0'
 401            && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 402     return restore_colon (i_l_p + 3, nul_char);
 403
 404   /* Check to see if the text following the colon is '32'.  */
 405   else if (i_l_p[1] == '3' && i_l_p[2] =='2'
 406            && (i_l_p[3] == ' ' || i_l_p[3] == '\t'))
 407     return restore_colon (i_l_p + 3, nul_char);
 408
 409   return 0;
 410 }
 411
 412 bfd_boolean
 413 fr30_fix_adjustable (fixS * fixP)
 414 {
 415   /* We need the symbol name for the VTABLE entries.  */
 416   if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
 417       || fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
 418     return 0;
 419
 420   return 1;
 421 }