opcodes/v850-dis.c

   1 /* Disassemble V850 instructions.
   2    Copyright 1996, 1997, 1998, 2000, 2001 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
  19 #include <stdio.h>
  20
  21 #include "sysdep.h"
  22 #include "opcode/v850.h"
  23 #include "dis-asm.h"
  24 #include "opintl.h"
  25
  26 static const char *const v850_reg_names[] =
  27 { "r0", "r1", "r2", "sp", "gp", "r5", "r6", "r7",
  28   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  29   "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  30   "r24", "r25", "r26", "r27", "r28", "r29", "ep", "lp" };
  31
  32 static const char *const v850_sreg_names[] =
  33 { "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7",
  34   "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",
  35   "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23",
  36   "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31",
  37   "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23",
  38   "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31" };
  39
  40 static const char *const v850_cc_names[] =
  41 { "v", "c/l", "z", "nh", "s/n", "t", "lt", "le",
  42   "nv", "nc/nl", "nz", "h", "ns/p", "sa", "ge", "gt" };
  43
  44 static int disassemble
  45   PARAMS ((bfd_vma, struct disassemble_info *, unsigned long));
  46
  47 static int
  48 disassemble (memaddr, info, insn)
  49      bfd_vma memaddr;
  50      struct disassemble_info *info;
  51      unsigned long insn;
  52 {
  53   struct v850_opcode *          op = (struct v850_opcode *)v850_opcodes;
  54   const struct v850_operand *   operand;
  55   int                           match = 0;
  56   int                           short_op = ((insn & 0x0600) != 0x0600);
  57   int                           bytes_read;
  58   int                           target_processor;
  59
  60   /* Special case: 32 bit MOV */
  61   if ((insn & 0xffe0) == 0x0620)
  62     short_op = true;
  63
  64   bytes_read = short_op ? 2 : 4;
  65
  66   /* If this is a two byte insn, then mask off the high bits. */
  67   if (short_op)
  68     insn &= 0xffff;
  69
  70   switch (info->mach)
  71     {
  72     case 0:
  73     default:
  74       target_processor = PROCESSOR_V850;
  75       break;
  76
  77     case bfd_mach_v850e:
  78       target_processor = PROCESSOR_V850E;
  79       break;
  80     }
  81
  82   /* Find the opcode.  */
  83   while (op->name)
  84     {
  85       if ((op->mask & insn) == op->opcode
  86           && (op->processors & target_processor))
  87         {
  88           const unsigned char * opindex_ptr;
  89           unsigned int          opnum;
  90           unsigned int          memop;
  91
  92           match = 1;
  93           (*info->fprintf_func) (info->stream, "%s\t", op->name);
  94 /*fprintf (stderr, "match: mask: %x insn: %x, opcode: %x, name: %s\n", op->mask, insn, op->opcode, op->name );*/
  95
  96           memop = op->memop;
  97           /* Now print the operands.
  98
  99              MEMOP is the operand number at which a memory
 100              address specification starts, or zero if this
 101              instruction has no memory addresses.
 102
 103              A memory address is always two arguments.
 104
 105              This information allows us to determine when to
 106              insert commas into the output stream as well as
 107              when to insert disp[reg] expressions onto the
 108              output stream.  */
 109
 110           for (opindex_ptr = op->operands, opnum = 1;
 111                *opindex_ptr != 0;
 112                opindex_ptr++, opnum++)
 113             {
 114               long      value;
 115               int       flag;
 116               int       status;
 117               bfd_byte  buffer[ 4 ];
 118
 119               operand = &v850_operands[*opindex_ptr];
 120
 121               if (operand->extract)
 122                 value = (operand->extract) (insn, 0);
 123               else
 124                 {
 125                   if (operand->bits == -1)
 126                     value = (insn & operand->shift);
 127                   else
 128                     value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 129
 130                   if (operand->flags & V850_OPERAND_SIGNED)
 131                     value = ((long)(value << (32 - operand->bits))
 132                              >> (32 - operand->bits));
 133                 }
 134
 135               /* The first operand is always output without any
 136                  special handling.
 137
 138                  For the following arguments:
 139
 140                    If memop && opnum == memop + 1, then we need '[' since
 141                    we're about to output the register used in a memory
 142                    reference.
 143
 144                    If memop && opnum == memop + 2, then we need ']' since
 145                    we just finished the register in a memory reference.  We
 146                    also need a ',' before this operand.
 147
 148                    Else we just need a comma.
 149
 150                    We may need to output a trailing ']' if the last operand
 151                    in an instruction is the register for a memory address.
 152
 153                    The exception (and there's always an exception) is the
 154                    "jmp" insn which needs square brackets around it's only
 155                    register argument.  */
 156
 157                    if (memop && opnum == memop + 1) info->fprintf_func (info->stream, "[");
 158               else if (memop && opnum == memop + 2) info->fprintf_func (info->stream, "],");
 159               else if (memop == 1 && opnum == 1
 160                        && (operand->flags & V850_OPERAND_REG))
 161                                                     info->fprintf_func (info->stream, "[");
 162               else if (opnum > 1)                   info->fprintf_func (info->stream, ", ");
 163
 164               /* extract the flags, ignorng ones which do not effect disassembly output. */
 165               flag = operand->flags;
 166               flag &= ~ V850_OPERAND_SIGNED;
 167               flag &= ~ V850_OPERAND_RELAX;
 168               flag &= - flag;
 169
 170               switch (flag)
 171                 {
 172                 case V850_OPERAND_REG:  info->fprintf_func (info->stream, "%s", v850_reg_names[value]); break;
 173                 case V850_OPERAND_SRG:  info->fprintf_func (info->stream, "%s", v850_sreg_names[value]); break;
 174                 case V850_OPERAND_CC:   info->fprintf_func (info->stream, "%s", v850_cc_names[value]); break;
 175                 case V850_OPERAND_EP:   info->fprintf_func (info->stream, "ep"); break;
 176                 default:                info->fprintf_func (info->stream, "%d", value); break;
 177                 case V850_OPERAND_DISP:
 178                   {
 179                     bfd_vma addr = value + memaddr;
 180
 181                     /* On the v850 the top 8 bits of an address are used by an overlay manager.
 182                        Thus it may happen that when we are looking for a symbol to match
 183                        against an address with some of its top bits set, the search fails to
 184                        turn up an exact match.  In this case we try to find an exact match
 185                        against a symbol in the lower address space, and if we find one, we
 186                        use that address.   We only do this for JARL instructions however, as
 187                        we do not want to misinterpret branch instructions.  */
 188                     if (operand->bits == 22)
 189                       {
 190                         if ( ! info->symbol_at_address_func (addr, info)
 191                             && ((addr & 0xFF000000) != 0)
 192                             && info->symbol_at_address_func (addr & 0x00FFFFFF, info))
 193                           {
 194                             addr &= 0x00FFFFFF;
 195                           }
 196                       }
 197                     info->print_address_func (addr, info);
 198                     break;
 199                   }
 200
 201                 case V850E_PUSH_POP:
 202                   {
 203                     static int list12_regs[32]   = { 30,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0,  0, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };
 204                     static int list18_h_regs[32] = { 19, 18, 17, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 30, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };
 205                     static int list18_l_regs[32] = {  3,  2,  1, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 14, 15, 13, 12,  7,  6,  5,  4, 11, 10,  9,  8 };
 206                     int *             regs;
 207                     int               i;
 208                     unsigned long int mask = 0;
 209                     int               pc   = false;
 210                     int               sr   = false;
 211
 212
 213                     switch (operand->shift)
 214                       {
 215                       case 0xffe00001: regs = list12_regs; break;
 216                       case 0xfff8000f: regs = list18_h_regs; break;
 217                       case 0xfff8001f: regs = list18_l_regs; value &= ~0x10; break;  /* Do not include magic bit */
 218                       default:
 219                         /* xgettext:c-format */
 220                         fprintf (stderr, _("unknown operand shift: %x\n"), operand->shift );
 221                         abort();
 222                       }
 223
 224                     for (i = 0; i < 32; i++)
 225                       {
 226                         if (value & (1 << i))
 227                           {
 228                             switch (regs[ i ])
 229                               {
 230                               default: mask |= (1 << regs[ i ]); break;
 231                                 /* xgettext:c-format */
 232                               case 0:  fprintf (stderr, _("unknown pop reg: %d\n"), i ); abort();
 233                               case -1: pc = true; break;
 234                               case -2: sr = true; break;
 235                               }
 236                           }
 237                       }
 238
 239                     info->fprintf_func (info->stream, "{");
 240
 241                     if (mask || pc || sr)
 242                       {
 243                         if (mask)
 244                           {
 245                             unsigned int bit;
 246                             int          shown_one = false;
 247
 248                             for (bit = 0; bit < 32; bit++)
 249                               if (mask & (1 << bit))
 250                                 {
 251                                   unsigned long int first = bit;
 252                                   unsigned long int last;
 253
 254                                   if (shown_one)
 255                                     info->fprintf_func (info->stream, ", ");
 256                                   else
 257                                     shown_one = true;
 258
 259                                   info->fprintf_func (info->stream, v850_reg_names[first]);
 260
 261                                   for (bit++; bit < 32; bit++)
 262                                     if ((mask & (1 << bit)) == 0)
 263                                       break;
 264
 265                                   last = bit;
 266
 267                                   if (last > first + 1)
 268                                     {
 269                                       info->fprintf_func (info->stream, " - %s", v850_reg_names[ last - 1 ]);
 270                                     }
 271                                 }
 272                           }
 273
 274                         if (pc)
 275                           info->fprintf_func (info->stream, "%sPC", mask ? ", " : "");
 276                         if (sr)
 277                           info->fprintf_func (info->stream, "%sSR", (mask || pc) ? ", " : "");
 278                       }
 279
 280                     info->fprintf_func (info->stream, "}");
 281                   }
 282                 break;
 283
 284                 case V850E_IMMEDIATE16:
 285                   status = info->read_memory_func (memaddr + bytes_read, buffer, 2, info);
 286                   if (status == 0)
 287                     {
 288                       bytes_read += 2;
 289                       value = bfd_getl16 (buffer);
 290
 291                       /* If this is a DISPOSE instruction with ff set to 0x10, then shift value up by 16.  */
 292                       if ((insn & 0x001fffc0) == 0x00130780)
 293                         value <<= 16;
 294
 295                       info->fprintf_func (info->stream, "0x%x", value);
 296                     }
 297                   else
 298                     {
 299                       info->memory_error_func (status, memaddr + bytes_read, info);
 300                     }
 301                   break;
 302
 303                 case V850E_IMMEDIATE32:
 304                   status = info->read_memory_func (memaddr + bytes_read, buffer, 4, info);
 305                   if (status == 0)
 306                     {
 307                       bytes_read += 4;
 308                       value = bfd_getl32 (buffer);
 309                       info->fprintf_func (info->stream, "0x%lx", value);
 310                     }
 311                   else
 312                     {
 313                       info->memory_error_func (status, memaddr + bytes_read, info);
 314                     }
 315                   break;
 316                 }
 317
 318               /* Handle jmp correctly.  */
 319               if (memop == 1 && opnum == 1
 320                   && ((operand->flags & V850_OPERAND_REG) != 0))
 321                 (*info->fprintf_func) (info->stream, "]");
 322             }
 323
 324           /* Close any square bracket we left open.  */
 325           if (memop && opnum == memop + 2)
 326             (*info->fprintf_func) (info->stream, "]");
 327
 328           /* All done. */
 329           break;
 330         }
 331       op++;
 332     }
 333
 334   if (!match)
 335     {
 336       if (short_op)
 337         info->fprintf_func (info->stream, ".short\t0x%04x", insn);
 338       else
 339         info->fprintf_func (info->stream, ".long\t0x%08x", insn);
 340     }
 341
 342   return bytes_read;
 343 }
 344
 345 int
 346 print_insn_v850 (memaddr, info)
 347      bfd_vma memaddr;
 348      struct disassemble_info * info;
 349 {
 350   int           status;
 351   bfd_byte      buffer[ 4 ];
 352   unsigned long insn = 0;
 353
 354   /* First figure out how big the opcode is.  */
 355
 356   status = info->read_memory_func (memaddr, buffer, 2, info);
 357   if (status == 0)
 358     {
 359       insn = bfd_getl16 (buffer);
 360
 361       if (   (insn & 0x0600) == 0x0600
 362           && (insn & 0xffe0) != 0x0620)
 363         {
 364           /* If this is a 4 byte insn, read 4 bytes of stuff.  */
 365           status = info->read_memory_func (memaddr, buffer, 4, info);
 366
 367           if (status == 0)
 368             insn = bfd_getl32 (buffer);
 369         }
 370     }
 371
 372   if (status != 0)
 373     {
 374       info->memory_error_func (status, memaddr, info);
 375       return -1;
 376     }
 377
 378   /* Make sure we tell our caller how many bytes we consumed.  */
 379   return disassemble (memaddr, info, insn);
 380 }