opcodes/v850-dis.c

   1 /* Disassemble V850 instructions.
   2    Copyright 1996, 1997, 1998, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19
  20 #include <stdio.h>
  21
  22 #include "sysdep.h"
  23 #include "opcode/v850.h"
  24 #include "dis-asm.h"
  25 #include "opintl.h"
  26
  27 static const char *const v850_reg_names[] =
  28 { "r0", "r1", "r2", "sp", "gp", "r5", "r6", "r7",
  29   "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  30   "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  31   "r24", "r25", "r26", "r27", "r28", "r29", "ep", "lp" };
  32
  33 static const char *const v850_sreg_names[] =
  34 { "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7",
  35   "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",
  36   "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23",
  37   "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31",
  38   "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23",
  39   "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31" };
  40
  41 static const char *const v850_cc_names[] =
  42 { "v", "c/l", "z", "nh", "s/n", "t", "lt", "le",
  43   "nv", "nc/nl", "nz", "h", "ns/p", "sa", "ge", "gt" };
  44
  45 static int disassemble
  46   PARAMS ((bfd_vma, struct disassemble_info *, unsigned long));
  47
  48 static int
  49 disassemble (memaddr, info, insn)
  50      bfd_vma memaddr;
  51      struct disassemble_info *info;
  52      unsigned long insn;
  53 {
  54   struct v850_opcode *op = (struct v850_opcode *)v850_opcodes;
  55   const struct v850_operand *operand;
  56   int match = 0;
  57   int short_op = ((insn & 0x0600) != 0x0600);
  58   int bytes_read;
  59   int target_processor;
  60
  61   /* Special case: 32 bit MOV */
  62   if ((insn & 0xffe0) == 0x0620)
  63     short_op = 1;
  64
  65   bytes_read = short_op ? 2 : 4;
  66
  67   /* If this is a two byte insn, then mask off the high bits. */
  68   if (short_op)
  69     insn &= 0xffff;
  70
  71   switch (info->mach)
  72     {
  73     case 0:
  74     default:
  75       target_processor = PROCESSOR_V850;
  76       break;
  77
  78     case bfd_mach_v850e:
  79       target_processor = PROCESSOR_V850E;
  80       break;
  81     }
  82
  83   /* Find the opcode.  */
  84   while (op->name)
  85     {
  86       if ((op->mask & insn) == op->opcode
  87           && (op->processors & target_processor))
  88         {
  89           const unsigned char *opindex_ptr;
  90           unsigned int opnum;
  91           unsigned int memop;
  92
  93           match = 1;
  94           (*info->fprintf_func) (info->stream, "%s\t", op->name);
  95 /*fprintf (stderr, "match: mask: %x insn: %x, opcode: %x, name: %s\n", op->mask, insn, op->opcode, op->name );*/
  96
  97           memop = op->memop;
  98           /* Now print the operands.
  99
 100              MEMOP is the operand number at which a memory
 101              address specification starts, or zero if this
 102              instruction has no memory addresses.
 103
 104              A memory address is always two arguments.
 105
 106              This information allows us to determine when to
 107              insert commas into the output stream as well as
 108              when to insert disp[reg] expressions onto the
 109              output stream.  */
 110
 111           for (opindex_ptr = op->operands, opnum = 1;
 112                *opindex_ptr != 0;
 113                opindex_ptr++, opnum++)
 114             {
 115               long value;
 116               int flag;
 117               int status;
 118               bfd_byte buffer[4];
 119
 120               operand = &v850_operands[*opindex_ptr];
 121
 122               if (operand->extract)
 123                 value = (operand->extract) (insn, 0);
 124               else
 125                 {
 126                   if (operand->bits == -1)
 127                     value = (insn & operand->shift);
 128                   else
 129                     value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 130
 131                   if (operand->flags & V850_OPERAND_SIGNED)
 132                     value = ((long)(value << (32 - operand->bits))
 133                              >> (32 - operand->bits));
 134                 }
 135
 136               /* The first operand is always output without any
 137                  special handling.
 138
 139                  For the following arguments:
 140
 141                    If memop && opnum == memop + 1, then we need '[' since
 142                    we're about to output the register used in a memory
 143                    reference.
 144
 145                    If memop && opnum == memop + 2, then we need ']' since
 146                    we just finished the register in a memory reference.  We
 147                    also need a ',' before this operand.
 148
 149                    Else we just need a comma.
 150
 151                    We may need to output a trailing ']' if the last operand
 152                    in an instruction is the register for a memory address.
 153
 154                    The exception (and there's always an exception) is the
 155                    "jmp" insn which needs square brackets around it's only
 156                    register argument.  */
 157
 158                    if (memop && opnum == memop + 1) info->fprintf_func (info->stream, "[");
 159               else if (memop && opnum == memop + 2) info->fprintf_func (info->stream, "],");
 160               else if (memop == 1 && opnum == 1
 161                        && (operand->flags & V850_OPERAND_REG))
 162                                                     info->fprintf_func (info->stream, "[");
 163               else if (opnum > 1)                   info->fprintf_func (info->stream, ", ");
 164
 165               /* extract the flags, ignorng ones which do not effect disassembly output. */
 166               flag = operand->flags;
 167               flag &= ~ V850_OPERAND_SIGNED;
 168               flag &= ~ V850_OPERAND_RELAX;
 169               flag &= - flag;
 170
 171               switch (flag)
 172                 {
 173                 case V850_OPERAND_REG:  info->fprintf_func (info->stream, "%s", v850_reg_names[value]); break;
 174                 case V850_OPERAND_SRG:  info->fprintf_func (info->stream, "%s", v850_sreg_names[value]); break;
 175                 case V850_OPERAND_CC:   info->fprintf_func (info->stream, "%s", v850_cc_names[value]); break;
 176                 case V850_OPERAND_EP:   info->fprintf_func (info->stream, "ep"); break;
 177                 default:                info->fprintf_func (info->stream, "%d", value); break;
 178                 case V850_OPERAND_DISP:
 179                   {
 180                     bfd_vma addr = value + memaddr;
 181
 182                     /* On the v850 the top 8 bits of an address are used by an overlay manager.
 183                        Thus it may happen that when we are looking for a symbol to match
 184                        against an address with some of its top bits set, the search fails to
 185                        turn up an exact match.  In this case we try to find an exact match
 186                        against a symbol in the lower address space, and if we find one, we
 187                        use that address.   We only do this for JARL instructions however, as
 188                        we do not want to misinterpret branch instructions.  */
 189                     if (operand->bits == 22)
 190                       {
 191                         if ( ! info->symbol_at_address_func (addr, info)
 192                             && ((addr & 0xFF000000) != 0)
 193                             && info->symbol_at_address_func (addr & 0x00FFFFFF, info))
 194                           {
 195                             addr &= 0x00FFFFFF;
 196                           }
 197                       }
 198                     info->print_address_func (addr, info);
 199                     break;
 200                   }
 201
 202                 case V850E_PUSH_POP:
 203                   {
 204                     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 };
 205                     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 };
 206                     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 };
 207                     int *regs;
 208                     int i;
 209                     unsigned long int mask = 0;
 210                     int pc = 0;
 211                     int sr = 0;
 212
 213
 214                     switch (operand->shift)
 215                       {
 216                       case 0xffe00001: regs = list12_regs; break;
 217                       case 0xfff8000f: regs = list18_h_regs; break;
 218                       case 0xfff8001f: regs = list18_l_regs; value &= ~0x10; break;  /* Do not include magic bit */
 219                       default:
 220                         /* xgettext:c-format */
 221                         fprintf (stderr, _("unknown operand shift: %x\n"), operand->shift );
 222                         abort();
 223                       }
 224
 225                     for (i = 0; i < 32; i++)
 226                       {
 227                         if (value & (1 << i))
 228                           {
 229                             switch (regs[ i ])
 230                               {
 231                               default: mask |= (1 << regs[ i ]); break;
 232                                 /* xgettext:c-format */
 233                               case 0:  fprintf (stderr, _("unknown pop reg: %d\n"), i ); abort();
 234                               case -1: pc = 1; break;
 235                               case -2: sr = 1; break;
 236                               }
 237                           }
 238                       }
 239
 240                     info->fprintf_func (info->stream, "{");
 241
 242                     if (mask || pc || sr)
 243                       {
 244                         if (mask)
 245                           {
 246                             unsigned int bit;
 247                             int shown_one = 0;
 248
 249                             for (bit = 0; bit < 32; bit++)
 250                               if (mask & (1 << bit))
 251                                 {
 252                                   unsigned long int first = bit;
 253                                   unsigned long int last;
 254
 255                                   if (shown_one)
 256                                     info->fprintf_func (info->stream, ", ");
 257                                   else
 258                                     shown_one = 1;
 259
 260                                   info->fprintf_func (info->stream, v850_reg_names[first]);
 261
 262                                   for (bit++; bit < 32; bit++)
 263                                     if ((mask & (1 << bit)) == 0)
 264                                       break;
 265
 266                                   last = bit;
 267
 268                                   if (last > first + 1)
 269                                     {
 270                                       info->fprintf_func (info->stream, " - %s", v850_reg_names[ last - 1 ]);
 271                                     }
 272                                 }
 273                           }
 274
 275                         if (pc)
 276                           info->fprintf_func (info->stream, "%sPC", mask ? ", " : "");
 277                         if (sr)
 278                           info->fprintf_func (info->stream, "%sSR", (mask || pc) ? ", " : "");
 279                       }
 280
 281                     info->fprintf_func (info->stream, "}");
 282                   }
 283                 break;
 284
 285                 case V850E_IMMEDIATE16:
 286                   status = info->read_memory_func (memaddr + bytes_read, buffer, 2, info);
 287                   if (status == 0)
 288                     {
 289                       bytes_read += 2;
 290                       value = bfd_getl16 (buffer);
 291
 292                       /* If this is a DISPOSE instruction with ff set to 0x10, then shift value up by 16.  */
 293                       if ((insn & 0x001fffc0) == 0x00130780)
 294                         value <<= 16;
 295
 296                       info->fprintf_func (info->stream, "0x%x", value);
 297                     }
 298                   else
 299                     {
 300                       info->memory_error_func (status, memaddr + bytes_read, info);
 301                     }
 302                   break;
 303
 304                 case V850E_IMMEDIATE32:
 305                   status = info->read_memory_func (memaddr + bytes_read, buffer, 4, info);
 306                   if (status == 0)
 307                     {
 308                       bytes_read += 4;
 309                       value = bfd_getl32 (buffer);
 310                       info->fprintf_func (info->stream, "0x%lx", value);
 311                     }
 312                   else
 313                     {
 314                       info->memory_error_func (status, memaddr + bytes_read, info);
 315                     }
 316                   break;
 317                 }
 318
 319               /* Handle jmp correctly.  */
 320               if (memop == 1 && opnum == 1
 321                   && ((operand->flags & V850_OPERAND_REG) != 0))
 322                 (*info->fprintf_func) (info->stream, "]");
 323             }
 324
 325           /* Close any square bracket we left open.  */
 326           if (memop && opnum == memop + 2)
 327             (*info->fprintf_func) (info->stream, "]");
 328
 329           /* All done. */
 330           break;
 331         }
 332       op++;
 333     }
 334
 335   if (!match)
 336     {
 337       if (short_op)
 338         info->fprintf_func (info->stream, ".short\t0x%04x", insn);
 339       else
 340         info->fprintf_func (info->stream, ".long\t0x%08x", insn);
 341     }
 342
 343   return bytes_read;
 344 }
 345
 346 int
 347 print_insn_v850 (memaddr, info)
 348      bfd_vma memaddr;
 349      struct disassemble_info * info;
 350 {
 351   int status;
 352   bfd_byte buffer[4];
 353   unsigned long insn = 0;
 354
 355   /* First figure out how big the opcode is.  */
 356
 357   status = info->read_memory_func (memaddr, buffer, 2, info);
 358   if (status == 0)
 359     {
 360       insn = bfd_getl16 (buffer);
 361
 362       if (   (insn & 0x0600) == 0x0600
 363           && (insn & 0xffe0) != 0x0620)
 364         {
 365           /* If this is a 4 byte insn, read 4 bytes of stuff.  */
 366           status = info->read_memory_func (memaddr, buffer, 4, info);
 367
 368           if (status == 0)
 369             insn = bfd_getl32 (buffer);
 370         }
 371     }
 372
 373   if (status != 0)
 374     {
 375       info->memory_error_func (status, memaddr, info);
 376       return -1;
 377     }
 378
 379   /* Make sure we tell our caller how many bytes we consumed.  */
 380   return disassemble (memaddr, info, insn);
 381 }