opcodes/h8500-dis.c

   1 /* Disassemble h8500 instructions.
   2    Copyright (C) 1993, 94, 95, 1998 Free Software Foundation, Inc.
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation; either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #include <stdio.h>
  19
  20 #define DISASSEMBLER_TABLE
  21 #define DEFINE_TABLE
  22
  23 #include "sysdep.h"
  24 #include "h8500-opc.h"
  25 #include "dis-asm.h"
  26 #include "opintl.h"
  27
  28 /* Maximum length of an instruction.  */
  29 #define MAXLEN 8
  30
  31 #include <setjmp.h>
  32
  33 struct private
  34 {
  35   /* Points to first byte not fetched.  */
  36   bfd_byte *max_fetched;
  37   bfd_byte the_buffer[MAXLEN];
  38   bfd_vma insn_start;
  39   jmp_buf bailout;
  40 };
  41
  42 /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive)
  43    to ADDR (exclusive) are valid.  Returns 1 for success, longjmps
  44    on error.  */
  45 #define FETCH_DATA(info, addr) \
  46   ((addr) <= ((struct private *)(info->private_data))->max_fetched \
  47    ? 1 : fetch_data ((info), (addr)))
  48
  49 static int
  50 fetch_data (info, addr)
  51      struct disassemble_info *info;
  52      bfd_byte *addr;
  53 {
  54   int status;
  55   struct private *priv = (struct private *) info->private_data;
  56   bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer);
  57
  58   status = (*info->read_memory_func) (start,
  59                                       priv->max_fetched,
  60                                       addr - priv->max_fetched,
  61                                       info);
  62   if (status != 0)
  63     {
  64       (*info->memory_error_func) (status, start, info);
  65       longjmp (priv->bailout, 1);
  66     }
  67   else
  68     priv->max_fetched = addr;
  69   return 1;
  70 }
  71
  72 static char *crname[] =
  73 {"sr", "ccr", "*", "br", "ep", "dp", "*", "tp"};
  74
  75 int
  76 print_insn_h8500 (addr, info)
  77      bfd_vma addr;
  78      disassemble_info *info;
  79 {
  80   h8500_opcode_info *opcode;
  81   void *stream = info->stream;
  82   fprintf_ftype func = info->fprintf_func;
  83
  84   struct private priv;
  85   bfd_byte *buffer = priv.the_buffer;
  86
  87   info->private_data = (PTR) & priv;
  88   priv.max_fetched = priv.the_buffer;
  89   priv.insn_start = addr;
  90   if (setjmp (priv.bailout) != 0)
  91     /* Error return.  */
  92     return -1;
  93
  94 if (0)  {
  95     static    int one;
  96     if (!one )
  97       {
  98         one = 1;
  99         for (opcode = h8500_table; opcode->name; opcode++)
 100           {
 101             if ((opcode->bytes[0].contents & 0x8) == 0)
 102               printf("%s\n", opcode->name);
 103           }
 104       }
 105   }
 106
 107
 108   /* Run down the table to find the one which matches */
 109   for (opcode = h8500_table; opcode->name; opcode++)
 110     {
 111       int byte;
 112       int rn = 0;
 113       int rd = 0;
 114       int rs = 0;
 115       int disp = 0;
 116       int abs = 0;
 117       int imm = 0;
 118       int pcrel = 0;
 119       int qim = 0;
 120       int i;
 121       int cr = 0;
 122       for (byte = 0; byte < opcode->length; byte++)
 123         {
 124           FETCH_DATA (info, buffer + byte + 1);
 125           if ((buffer[byte] & opcode->bytes[byte].mask)
 126               != (opcode->bytes[byte].contents))
 127             {
 128               goto next;
 129             }
 130           else
 131             {
 132               /* extract any info parts */
 133               switch (opcode->bytes[byte].insert)
 134                 {
 135                 case 0:
 136                 case FP:
 137                   break;
 138                 default:
 139                   /* xgettext:c-format */
 140                   func (stream, _("can't cope with insert %d\n"),
 141                         opcode->bytes[byte].insert);
 142                   break;
 143                 case RN:
 144                   rn = buffer[byte] & 0x7;
 145                   break;
 146                 case RS:
 147                   rs = buffer[byte] & 0x7;
 148                   break;
 149                 case CRB:
 150                   cr = buffer[byte] & 0x7;
 151                   if (cr == 0)
 152                     goto next;
 153                   break;
 154                 case CRW:
 155                   cr = buffer[byte] & 0x7;
 156                   if (cr != 0)
 157                     goto next;
 158                   break;
 159                 case DISP16:
 160                   FETCH_DATA (info, buffer + byte + 2);
 161                   disp = (buffer[byte] << 8) | (buffer[byte + 1]);
 162                   break;
 163                 case FPIND_D8:
 164                 case DISP8:
 165                   disp = ((char) (buffer[byte]));
 166                   break;
 167                 case RD:
 168                 case RDIND:
 169                   rd = buffer[byte] & 0x7;
 170                   break;
 171                 case ABS24:
 172                   FETCH_DATA (info, buffer + byte + 3);
 173                   abs =
 174                     (buffer[byte] << 16)
 175                     | (buffer[byte + 1] << 8)
 176                     | (buffer[byte + 2]);
 177                   break;
 178                 case ABS16:
 179                   FETCH_DATA (info, buffer + byte + 2);
 180                   abs = (buffer[byte] << 8) | (buffer[byte + 1]);
 181                   break;
 182                 case ABS8:
 183                   abs = (buffer[byte]);
 184                   break;
 185                 case IMM16:
 186                   FETCH_DATA (info, buffer + byte + 2);
 187                   imm = (buffer[byte] << 8) | (buffer[byte + 1]);
 188                   break;
 189                 case IMM4:
 190                   imm = (buffer[byte]) & 0xf;
 191                   break;
 192                 case IMM8:
 193                 case RLIST:
 194                   imm = (buffer[byte]);
 195                   break;
 196                 case PCREL16:
 197                   FETCH_DATA (info, buffer + byte + 2);
 198                   pcrel = (buffer[byte] << 8) | (buffer[byte + 1]);
 199                   break;
 200                 case PCREL8:
 201                   pcrel = (buffer[byte]);
 202                   break;
 203                 case QIM:
 204                   switch (buffer[byte] & 0x7)
 205                     {
 206                     case 0:
 207                       qim = 1;
 208                       break;
 209                     case 1:
 210                       qim = 2;
 211                       break;
 212                     case 4:
 213                       qim = -1;
 214                       break;
 215                     case 5:
 216                       qim = -2;
 217                       break;
 218                     }
 219                   break;
 220
 221                 }
 222             }
 223         }
 224       /* We get here when all the masks have passed so we can output the
 225          operands*/
 226       FETCH_DATA (info, buffer + opcode->length);
 227       for (i = 0; i < opcode->length; i++)
 228         {
 229           (func) (stream, "%02x ", buffer[i]);
 230         }
 231       for (; i < 6; i++)
 232         {
 233           (func) (stream, "   ");
 234         }
 235       (func) (stream, "%s\t", opcode->name);
 236       for (i = 0; i < opcode->nargs; i++)
 237         {
 238           if (i)
 239             (func) (stream, ",");
 240           switch (opcode->arg_type[i])
 241             {
 242             case FP:
 243               func (stream, "fp");
 244               break;
 245             case RNIND_D16:
 246               func (stream, "@(0x%x:16,r%d)", disp, rn);
 247               break;
 248             case RNIND_D8:
 249               func (stream, "@(0x%x:8 (%d),r%d)", disp & 0xff, disp, rn);
 250               break;
 251             case RDIND_D16:
 252               func (stream, "@(0x%x:16,r%d)", disp, rd);
 253               break;
 254             case RDIND_D8:
 255               func (stream, "@(0x%x:8 (%d), r%d)", disp & 0xff, disp, rd);
 256               break;
 257             case FPIND_D8:
 258               func (stream, "@(0x%x:8 (%d), fp)", disp & 0xff, disp, rn);
 259               break;
 260             case CRB:
 261             case CRW:
 262               func (stream, "%s", crname[cr]);
 263               break;
 264             case RN:
 265               func (stream, "r%d", rn);
 266               break;
 267             case RD:
 268               func (stream, "r%d", rd);
 269               break;
 270             case RS:
 271               func (stream, "r%d", rs);
 272               break;
 273             case RNDEC:
 274               func (stream, "@-r%d", rn);
 275               break;
 276             case RNINC:
 277               func (stream, "@r%d+", rn);
 278               break;
 279             case RNIND:
 280               func (stream, "@r%d", rn);
 281               break;
 282             case RDIND:
 283               func (stream, "@r%d", rd);
 284               break;
 285             case SPINC:
 286               func (stream, "@sp+");
 287               break;
 288             case SPDEC:
 289               func (stream, "@-sp");
 290               break;
 291             case ABS24:
 292               func (stream, "@0x%0x:24", abs);
 293               break;
 294             case ABS16:
 295               func (stream, "@0x%0x:16", abs & 0xffff);
 296               break;
 297             case ABS8:
 298               func (stream, "@0x%0x:8", abs & 0xff);
 299               break;
 300             case IMM16:
 301               func (stream, "#0x%0x:16", imm & 0xffff);
 302               break;
 303             case RLIST:
 304               {
 305                 int i;
 306                 int nc = 0;
 307                 func (stream, "(");
 308                 for (i = 0; i < 8; i++)
 309                   {
 310                     if (imm & (1 << i))
 311                       {
 312                         func (stream, "r%d", i);
 313                         if (nc)
 314                           func (stream, ",");
 315                         nc = 1;
 316                       }
 317                   }
 318                 func (stream, ")");
 319               }
 320               break;
 321             case IMM8:
 322               func (stream, "#0x%0x:8", imm & 0xff);
 323               break;
 324             case PCREL16:
 325               func (stream, "0x%0x:16", (pcrel + addr + opcode->length) & 0xffff);
 326               break;
 327             case PCREL8:
 328               func (stream, "#0x%0x:8",
 329                     ((char) pcrel + addr + opcode->length) & 0xffff);
 330               break;
 331             case QIM:
 332               func (stream, "#%d:q", qim);
 333               break;
 334             case IMM4:
 335               func (stream, "#%d:4", imm);
 336               break;
 337             }
 338         }
 339       return opcode->length;
 340     next:;
 341     }
 342
 343   /* Couldn't understand anything */
 344   /* xgettext:c-format */
 345   func (stream, _("%02x\t\t*unknown*"), buffer[0]);
 346   return 1;
 347
 348 }