cpu/m32r.opc

   1 /* M32R opcode support.  -*- C -*-
   2
   3    Copyright 1998, 1999, 2000, 2001, 2004, 2005
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Red Hat Inc; developed under contract from
   7    Mitsubishi Electric Corporation.
   8
   9    This file is part of the GNU Binutils.
  10
  11    Contributed by Red Hat Inc; developed under contract from Fujitsu.
  12
  13    This file is part of the GNU Binutils.
  14
  15    This program is free software; you can redistribute it and/or modify
  16    it under the terms of the GNU General Public License as published by
  17    the Free Software Foundation; either version 2 of the License, or
  18    (at your option) any later version.
  19
  20    This program is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program; if not, write to the Free Software
  27    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  28    MA 02110-1301, USA.  */
  29
  30 /* This file is an addendum to m32r.cpu.  Heavy use of C code isn't
  31    appropriate in .cpu files, so it resides here.  This especially applies
  32    to assembly/disassembly where parsing/printing can be quite involved.
  33    Such things aren't really part of the specification of the cpu, per se,
  34    so .cpu files provide the general framework and .opc files handle the
  35    nitty-gritty details as necessary.
  36
  37    Each section is delimited with start and end markers.
  38
  39    <arch>-opc.h additions use: "-- opc.h"
  40    <arch>-opc.c additions use: "-- opc.c"
  41    <arch>-asm.c additions use: "-- asm.c"
  42    <arch>-dis.c additions use: "-- dis.c"
  43    <arch>-ibd.h additions use: "-- ibd.h"  */
  44 \f
  45 /* -- opc.h */
  46
  47 #undef  CGEN_DIS_HASH_SIZE
  48 #define CGEN_DIS_HASH_SIZE 256
  49 #undef  CGEN_DIS_HASH
  50 #if 0
  51 #define X(b) (((unsigned char *) (b))[0] & 0xf0)
  52 #define CGEN_DIS_HASH(buffer, value) \
  53 (X (buffer) | \
  54  (X (buffer) == 0x40 || X (buffer) == 0xe0 || X (buffer) == 0x60 || X (buffer) == 0x50 ? 0 \
  55   : X (buffer) == 0x70 || X (buffer) == 0xf0 ? (((unsigned char *) (buffer))[0] & 0xf) \
  56   : X (buffer) == 0x30 ? ((((unsigned char *) (buffer))[1] & 0x70) >> 4) \
  57   : ((((unsigned char *) (buffer))[1] & 0xf0) >> 4)))
  58 #else
  59 #define CGEN_DIS_HASH(buffer, value) m32r_cgen_dis_hash (buffer, value)
  60 extern unsigned int m32r_cgen_dis_hash (const char *, CGEN_INSN_INT);
  61 #endif
  62
  63 /* -- */
  64 \f
  65 /* -- opc.c */
  66 unsigned int
  67 m32r_cgen_dis_hash (const char * buf ATTRIBUTE_UNUSED, CGEN_INSN_INT value)
  68 {
  69   unsigned int x;
  70
  71   if (value & 0xffff0000) /* 32bit instructions.  */
  72     value = (value >> 16) & 0xffff;
  73
  74   x = (value >> 8) & 0xf0;
  75   if (x == 0x40 || x == 0xe0 || x == 0x60 || x == 0x50)
  76     return x;
  77
  78   if (x == 0x70 || x == 0xf0)
  79     return x | ((value >> 8) & 0x0f);
  80
  81   if (x == 0x30)
  82     return x | ((value & 0x70) >> 4);
  83   else
  84     return x | ((value & 0xf0) >> 4);
  85 }
  86
  87 /* -- */
  88 \f
  89 /* -- asm.c */
  90 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
  91
  92 /* Handle '#' prefixes (i.e. skip over them).  */
  93
  94 static const char *
  95 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  96             const char **strp,
  97             int opindex ATTRIBUTE_UNUSED,
  98             long *valuep ATTRIBUTE_UNUSED)
  99 {
 100   if (**strp == '#')
 101     ++*strp;
 102   return NULL;
 103 }
 104
 105 /* Handle shigh(), high().  */
 106
 107 static const char *
 108 parse_hi16 (CGEN_CPU_DESC cd,
 109             const char **strp,
 110             int opindex,
 111             unsigned long *valuep)
 112 {
 113   const char *errmsg;
 114   enum cgen_parse_operand_result result_type;
 115   bfd_vma value;
 116
 117   if (**strp == '#')
 118     ++*strp;
 119
 120   if (strncasecmp (*strp, "high(", 5) == 0)
 121     {
 122       *strp += 5;
 123       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
 124                                    & result_type, & value);
 125       if (**strp != ')')
 126         return MISSING_CLOSING_PARENTHESIS;
 127       ++*strp;
 128       if (errmsg == NULL
 129           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 130         {
 131           value >>= 16;
 132           value &= 0xffff;
 133         }
 134       *valuep = value;
 135       return errmsg;
 136     }
 137   else if (strncasecmp (*strp, "shigh(", 6) == 0)
 138     {
 139       *strp += 6;
 140       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
 141                                    & result_type, & value);
 142       if (**strp != ')')
 143         return MISSING_CLOSING_PARENTHESIS;
 144       ++*strp;
 145       if (errmsg == NULL
 146           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 147         {
 148           value += 0x8000;
 149           value >>= 16;
 150           value &= 0xffff;
 151         }
 152       *valuep = value;
 153       return errmsg;
 154     }
 155
 156   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 157 }
 158
 159 /* Handle low() in a signed context.  Also handle sda().
 160    The signedness of the value doesn't matter to low(), but this also
 161    handles the case where low() isn't present.  */
 162
 163 static const char *
 164 parse_slo16 (CGEN_CPU_DESC cd,
 165              const char ** strp,
 166              int opindex,
 167              long * valuep)
 168 {
 169   const char *errmsg;
 170   enum cgen_parse_operand_result result_type;
 171   bfd_vma value;
 172
 173   if (**strp == '#')
 174     ++*strp;
 175
 176   if (strncasecmp (*strp, "low(", 4) == 0)
 177     {
 178       *strp += 4;
 179       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 180                                    & result_type, & value);
 181       if (**strp != ')')
 182         return MISSING_CLOSING_PARENTHESIS;
 183       ++*strp;
 184       if (errmsg == NULL
 185           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 186         value = ((value & 0xffff) ^ 0x8000) - 0x8000;
 187       *valuep = value;
 188       return errmsg;
 189     }
 190
 191   if (strncasecmp (*strp, "sda(", 4) == 0)
 192     {
 193       *strp += 4;
 194       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 195                                    NULL, & value);
 196       if (**strp != ')')
 197         return MISSING_CLOSING_PARENTHESIS;
 198       ++*strp;
 199       *valuep = value;
 200       return errmsg;
 201     }
 202
 203   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 204 }
 205
 206 /* Handle low() in an unsigned context.
 207    The signedness of the value doesn't matter to low(), but this also
 208    handles the case where low() isn't present.  */
 209
 210 static const char *
 211 parse_ulo16 (CGEN_CPU_DESC cd,
 212              const char **strp,
 213              int opindex,
 214              unsigned long *valuep)
 215 {
 216   const char *errmsg;
 217   enum cgen_parse_operand_result result_type;
 218   bfd_vma value;
 219
 220   if (**strp == '#')
 221     ++*strp;
 222
 223   if (strncasecmp (*strp, "low(", 4) == 0)
 224     {
 225       *strp += 4;
 226       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 227                                    & result_type, & value);
 228       if (**strp != ')')
 229         return MISSING_CLOSING_PARENTHESIS;
 230       ++*strp;
 231       if (errmsg == NULL
 232           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 233         value &= 0xffff;
 234       *valuep = value;
 235       return errmsg;
 236     }
 237
 238   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 239 }
 240
 241 /* -- */
 242 \f
 243 /* -- dis.c */
 244 /* Immediate values are prefixed with '#'.  */
 245
 246 #define CGEN_PRINT_NORMAL(cd, info, value, attrs, pc, length)   \
 247   do                                                            \
 248     {                                                           \
 249       if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_HASH_PREFIX))   \
 250         (*info->fprintf_func) (info->stream, "#");              \
 251     }                                                           \
 252   while (0)
 253
 254 /* Handle '#' prefixes as operands.  */
 255
 256 static void
 257 print_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 258             void * dis_info,
 259             long value ATTRIBUTE_UNUSED,
 260             unsigned int attrs ATTRIBUTE_UNUSED,
 261             bfd_vma pc ATTRIBUTE_UNUSED,
 262             int length ATTRIBUTE_UNUSED)
 263 {
 264   disassemble_info *info = (disassemble_info *) dis_info;
 265
 266   (*info->fprintf_func) (info->stream, "#");
 267 }
 268
 269 #undef  CGEN_PRINT_INSN
 270 #define CGEN_PRINT_INSN my_print_insn
 271
 272 static int
 273 my_print_insn (CGEN_CPU_DESC cd,
 274                bfd_vma pc,
 275                disassemble_info *info)
 276 {
 277   bfd_byte buffer[CGEN_MAX_INSN_SIZE];
 278   bfd_byte *buf = buffer;
 279   int status;
 280   int buflen = (pc & 3) == 0 ? 4 : 2;
 281   int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
 282   bfd_byte *x;
 283
 284   /* Read the base part of the insn.  */
 285
 286   status = (*info->read_memory_func) (pc - ((!big_p && (pc & 3) != 0) ? 2 : 0),
 287                                       buf, buflen, info);
 288   if (status != 0)
 289     {
 290       (*info->memory_error_func) (status, pc, info);
 291       return -1;
 292     }
 293
 294   /* 32 bit insn?  */
 295   x = (big_p ? &buf[0] : &buf[3]);
 296   if ((pc & 3) == 0 && (*x & 0x80) != 0)
 297     return print_insn (cd, pc, info, buf, buflen);
 298
 299   /* Print the first insn.  */
 300   if ((pc & 3) == 0)
 301     {
 302       buf += (big_p ? 0 : 2);
 303       if (print_insn (cd, pc, info, buf, 2) == 0)
 304         (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 305       buf += (big_p ? 2 : -2);
 306     }
 307
 308   x = (big_p ? &buf[0] : &buf[1]);
 309   if (*x & 0x80)
 310     {
 311       /* Parallel.  */
 312       (*info->fprintf_func) (info->stream, " || ");
 313       *x &= 0x7f;
 314     }
 315   else
 316     (*info->fprintf_func) (info->stream, " -> ");
 317
 318   /* The "& 3" is to pass a consistent address.
 319      Parallel insns arguably both begin on the word boundary.
 320      Also, branch insns are calculated relative to the word boundary.  */
 321   if (print_insn (cd, pc & ~ (bfd_vma) 3, info, buf, 2) == 0)
 322     (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 323
 324   return (pc & 3) ? 2 : 4;
 325 }
 326
 327 /* -- */