cpu/iq2000.opc

   1 /* IQ2000 opcode support.  -*- C -*-
   2
   3    Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5    Contributed by Red Hat Inc; developed under contract from Fujitsu.
   6
   7    This file is part of the GNU Binutils.
   8
   9    This program 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 of the License, or
  12    (at your option) any later version.
  13
  14    This program 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 this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22
  23 */
  24
  25 /* This file is an addendum to iq2000.cpu.  Heavy use of C code isn't
  26    appropriate in .cpu files, so it resides here.  This especially applies
  27    to assembly/disassembly where parsing/printing can be quite involved.
  28    Such things aren't really part of the specification of the cpu, per se,
  29    so .cpu files provide the general framework and .opc files handle the
  30    nitty-gritty details as necessary.
  31
  32    Each section is delimited with start and end markers.
  33
  34    <arch>-opc.h additions use: "-- opc.h"
  35    <arch>-opc.c additions use: "-- opc.c"
  36    <arch>-asm.c additions use: "-- asm.c"
  37    <arch>-dis.c additions use: "-- dis.c"
  38    <arch>-ibd.h additions use: "-- ibd.h"
  39 */
  40 \f
  41 /* -- opc.h */
  42
  43 /* Allows reason codes to be output when assembler errors occur.  */
  44 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
  45
  46 /* Override disassembly hashing - there are variable bits in the top
  47    byte of these instructions.  */
  48 #define CGEN_DIS_HASH_SIZE 8
  49 #define CGEN_DIS_HASH(buf,value) (((* (unsigned char*) (buf)) >> 6) % CGEN_DIS_HASH_SIZE)
  50
  51 /* following activates check beyond hashing since some iq2000 and iq10
  52    instructions have same mnemonics but different functionality. */
  53 #define CGEN_VALIDATE_INSN_SUPPORTED
  54
  55 extern int iq2000_cgen_insn_supported (CGEN_CPU_DESC cd, CGEN_INSN *insn);
  56
  57 /* -- asm.c */
  58 static const char * parse_mimm PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
  59 static const char * parse_imm  PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  60 static const char * parse_hi16 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  61 static const char * parse_lo16 PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
  62
  63 /* Special check to ensure that instruction exists for given machine */
  64 int
  65 iq2000_cgen_insn_supported (cd, insn)
  66      CGEN_CPU_DESC cd;
  67      CGEN_INSN *insn;
  68 {
  69   int machs = cd->machs;
  70
  71   return ((CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH) & machs) != 0);
  72 }
  73
  74 static int iq2000_cgen_isa_register (strp)
  75      const char **strp;
  76 {
  77   int len;
  78   int ch1, ch2;
  79   if (**strp == 'r' || **strp == 'R')
  80     {
  81       len = strlen (*strp);
  82       if (len == 2)
  83         {
  84           ch1 = (*strp)[1];
  85           if ('0' <= ch1 && ch1 <= '9')
  86             return 1;
  87         }
  88       else if (len == 3)
  89         {
  90           ch1 = (*strp)[1];
  91           ch2 = (*strp)[2];
  92           if (('1' <= ch1 && ch1 <= '2') && ('0' <= ch2 && ch2 <= '9'))
  93             return 1;
  94           if ('3' == ch1 && (ch2 == '0' || ch2 == '1'))
  95             return 1;
  96         }
  97     }
  98   if (**strp == '%' && tolower((*strp)[1]) != 'l' && tolower((*strp)[1]) != 'h')
  99     return 1;
 100   return 0;
 101 }
 102
 103 /* Handle negated literal.  */
 104
 105 static const char *
 106 parse_mimm (cd, strp, opindex, valuep)
 107      CGEN_CPU_DESC cd;
 108      const char **strp;
 109      int opindex;
 110      long *valuep;
 111 {
 112   const char *errmsg;
 113   long value;
 114
 115   /* Verify this isn't a register */
 116   if (iq2000_cgen_isa_register (strp))
 117     errmsg = _("immediate value cannot be register");
 118   else
 119     {
 120       long value;
 121
 122       errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
 123       if (errmsg == NULL)
 124         {
 125           long x = (-value) & 0xFFFF0000;
 126           if (x != 0 && x != 0xFFFF0000)
 127             errmsg = _("immediate value out of range");
 128           else
 129             *valuep = (-value & 0xFFFF);
 130         }
 131     }
 132   return errmsg;
 133 }
 134
 135 /* Handle signed/unsigned literal.  */
 136
 137 static const char *
 138 parse_imm (cd, strp, opindex, valuep)
 139      CGEN_CPU_DESC cd;
 140      const char **strp;
 141      int opindex;
 142      unsigned long *valuep;
 143 {
 144   const char *errmsg;
 145   long value;
 146
 147   if (iq2000_cgen_isa_register (strp))
 148     errmsg = _("immediate value cannot be register");
 149   else
 150     {
 151       long value;
 152
 153       errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
 154       if (errmsg == NULL)
 155         {
 156           long x = value & 0xFFFF0000;
 157           if (x != 0 && x != 0xFFFF0000)
 158             errmsg = _("immediate value out of range");
 159           else
 160             *valuep = (value & 0xFFFF);
 161         }
 162     }
 163   return errmsg;
 164 }
 165
 166 /* Handle iq10 21-bit jmp offset.  */
 167
 168 static const char *
 169 parse_jtargq10 (cd, strp, opindex, reloc, type_addr, valuep)
 170      CGEN_CPU_DESC cd;
 171      const char **strp;
 172      int opindex;
 173      int reloc;
 174      enum cgen_parse_operand_result *type_addr;
 175      unsigned long *valuep;
 176 {
 177   const char *errmsg;
 178   bfd_vma value;
 179   enum cgen_parse_operand_result result_type = CGEN_PARSE_OPERAND_RESULT_NUMBER;
 180
 181   errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_OFFSET_21,
 182                                &result_type, &value);
 183   if (errmsg == NULL && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 184     {
 185       /* check value is within 23-bits (remembering that 2-bit shift right will occur) */
 186       if (value > 0x7fffff)
 187         return _("21-bit offset out of range");
 188     }
 189   *valuep = (value & 0x7FFFFF);
 190   return errmsg;
 191 }
 192
 193 /* Handle high().  */
 194
 195 static const char *
 196 parse_hi16 (cd, strp, opindex, valuep)
 197      CGEN_CPU_DESC cd;
 198      const char **strp;
 199      int opindex;
 200      unsigned long *valuep;
 201 {
 202   if (strncasecmp (*strp, "%hi(", 4) == 0)
 203     {
 204       enum cgen_parse_operand_result result_type;
 205       bfd_vma value;
 206       const char *errmsg;
 207
 208       *strp += 4;
 209       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
 210                                    &result_type, &value);
 211       if (**strp != ')')
 212         return _("missing `)'");
 213
 214       ++*strp;
 215       if (errmsg == NULL
 216           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 217         {
 218           /* if value has top-bit of %lo on, then it will
 219              sign-propagate and so we compensate by adding
 220              1 to the resultant %hi value */
 221           if (value & 0x8000)
 222             value += 0x10000;
 223           value >>= 16;
 224         }
 225       *valuep = value;
 226
 227       return errmsg;
 228     }
 229
 230   /* we add %uhi in case a user just wants the high 16-bits or is using
 231      an insn like ori for %lo which does not sign-propagate */
 232   if (strncasecmp (*strp, "%uhi(", 5) == 0)
 233     {
 234       enum cgen_parse_operand_result result_type;
 235       bfd_vma value;
 236       const char *errmsg;
 237
 238       *strp += 5;
 239       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_UHI16,
 240                                    &result_type, &value);
 241       if (**strp != ')')
 242         return _("missing `)'");
 243
 244       ++*strp;
 245       if (errmsg == NULL
 246           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 247         {
 248           value >>= 16;
 249         }
 250       *valuep = value;
 251
 252       return errmsg;
 253     }
 254
 255   return parse_imm (cd, strp, opindex, valuep);
 256 }
 257
 258 /* Handle %lo in a signed context.
 259    The signedness of the value doesn't matter to %lo(), but this also
 260    handles the case where %lo() isn't present.  */
 261
 262 static const char *
 263 parse_lo16 (cd, strp, opindex, valuep)
 264      CGEN_CPU_DESC cd;
 265      const char **strp;
 266      int opindex;
 267      long *valuep;
 268 {
 269   if (strncasecmp (*strp, "%lo(", 4) == 0)
 270     {
 271       const char *errmsg;
 272       enum cgen_parse_operand_result result_type;
 273       bfd_vma value;
 274
 275       *strp += 4;
 276       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 277                                    &result_type, &value);
 278       if (**strp != ')')
 279         return _("missing `)'");
 280       ++*strp;
 281       if (errmsg == NULL
 282           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 283         value &= 0xffff;
 284       *valuep = value;
 285       return errmsg;
 286     }
 287
 288   return parse_imm (cd, strp, opindex, valuep);
 289 }
 290
 291 /* Handle %lo in a negated signed context.
 292    The signedness of the value doesn't matter to %lo(), but this also
 293    handles the case where %lo() isn't present.  */
 294
 295 static const char *
 296 parse_mlo16 (cd, strp, opindex, valuep)
 297      CGEN_CPU_DESC cd;
 298      const char **strp;
 299      int opindex;
 300      long *valuep;
 301 {
 302   if (strncasecmp (*strp, "%lo(", 4) == 0)
 303     {
 304       const char *errmsg;
 305       enum cgen_parse_operand_result result_type;
 306       bfd_vma value;
 307
 308       *strp += 4;
 309       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 310                                    &result_type, &value);
 311       if (**strp != ')')
 312         return _("missing `)'");
 313       ++*strp;
 314       if (errmsg == NULL
 315           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 316         value = (-value) & 0xffff;
 317       *valuep = value;
 318       return errmsg;
 319     }
 320
 321   return parse_mimm (cd, strp, opindex, valuep);
 322 }
 323
 324 /* -- */