opcodes/v850-dis.c

   1 /* Disassemble V850 instructions.
   2    Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003
   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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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     case bfd_mach_v850e1:
  83       target_processor = PROCESSOR_V850E1;
  84       break;
  85     }
  86
  87   /* Find the opcode.  */
  88   while (op->name)
  89     {
  90       if ((op->mask & insn) == op->opcode
  91           && (op->processors & target_processor))
  92         {
  93           const unsigned char *opindex_ptr;
  94           unsigned int opnum;
  95           unsigned int memop;
  96
  97           match = 1;
  98           (*info->fprintf_func) (info->stream, "%s\t", op->name);
  99 /*fprintf (stderr, "match: mask: %x insn: %x, opcode: %x, name: %s\n", op->mask, insn, op->opcode, op->name );*/
 100
 101           memop = op->memop;
 102           /* Now print the operands.
 103
 104              MEMOP is the operand number at which a memory
 105              address specification starts, or zero if this
 106              instruction has no memory addresses.
 107
 108              A memory address is always two arguments.
 109
 110              This information allows us to determine when to
 111              insert commas into the output stream as well as
 112              when to insert disp[reg] expressions onto the
 113              output stream.  */
 114
 115           for (opindex_ptr = op->operands, opnum = 1;
 116                *opindex_ptr != 0;
 117                opindex_ptr++, opnum++)
 118             {
 119               long value;
 120               int flag;
 121               int status;
 122               bfd_byte buffer[4];
 123
 124               operand = &v850_operands[*opindex_ptr];
 125
 126               if (operand->extract)
 127                 value = (operand->extract) (insn, 0);
 128               else
 129                 {
 130                   if (operand->bits == -1)
 131                     value = (insn & operand->shift);
 132                   else
 133                     value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 134
 135                   if (operand->flags & V850_OPERAND_SIGNED)
 136                     value = ((long)(value << (32 - operand->bits))
 137                              >> (32 - operand->bits));
 138                 }
 139
 140               /* The first operand is always output without any
 141                  special handling.
 142
 143                  For the following arguments:
 144
 145                    If memop && opnum == memop + 1, then we need '[' since
 146                    we're about to output the register used in a memory
 147                    reference.
 148
 149                    If memop && opnum == memop + 2, then we need ']' since
 150                    we just finished the register in a memory reference.  We
 151                    also need a ',' before this operand.
 152
 153                    Else we just need a comma.
 154
 155                    We may need to output a trailing ']' if the last operand
 156                    in an instruction is the register for a memory address.
 157
 158                    The exception (and there's always an exception) is the
 159                    "jmp" insn which needs square brackets around it's only
 160                    register argument.  */
 161
 162                    if (memop && opnum == memop + 1) info->fprintf_func (info->stream, "[");
 163               else if (memop && opnum == memop + 2) info->fprintf_func (info->stream, "],");
 164               else if (memop == 1 && opnum == 1
 165                        && (operand->flags & V850_OPERAND_REG))
 166                                                     info->fprintf_func (info->stream, "[");
 167               else if (opnum > 1)                   info->fprintf_func (info->stream, ", ");
 168
 169               /* extract the flags, ignorng ones which do not effect disassembly output. */
 170               flag = operand->flags;
 171               flag &= ~ V850_OPERAND_SIGNED;
 172               flag &= ~ V850_OPERAND_RELAX;
 173               flag &= - flag;
 174
 175               switch (flag)
 176                 {
 177                 case V850_OPERAND_REG:  info->fprintf_func (info->stream, "%s", v850_reg_names[value]); break;
 178                 case V850_OPERAND_SRG:  info->fprintf_func (info->stream, "%s", v850_sreg_names[value]); break;
 179                 case V850_OPERAND_CC:   info->fprintf_func (info->stream, "%s", v850_cc_names[value]); break;
 180                 case V850_OPERAND_EP:   info->fprintf_func (info->stream, "ep"); break;
 181                 default:                info->fprintf_func (info->stream, "%d", value); break;
 182                 case V850_OPERAND_DISP:
 183                   {
 184                     bfd_vma addr = value + memaddr;
 185
 186                     /* On the v850 the top 8 bits of an address are used by an overlay manager.
 187                        Thus it may happen that when we are looking for a symbol to match
 188                        against an address with some of its top bits set, the search fails to
 189                        turn up an exact match.  In this case we try to find an exact match
 190                        against a symbol in the lower address space, and if we find one, we
 191                        use that address.   We only do this for JARL instructions however, as
 192                        we do not want to misinterpret branch instructions.  */
 193                     if (operand->bits == 22)
 194                       {
 195                         if ( ! info->symbol_at_address_func (addr, info)
 196                             && ((addr & 0xFF000000) != 0)
 197                             && info->symbol_at_address_func (addr & 0x00FFFFFF, info))
 198                           {
 199                             addr &= 0x00FFFFFF;
 200                           }
 201                       }
 202                     info->print_address_func (addr, info);
 203                     break;
 204                   }
 205
 206                 case V850E_PUSH_POP:
 207                   {
 208                     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 };
 209                     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 };
 210                     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 };
 211                     int *regs;
 212                     int i;
 213                     unsigned long int mask = 0;
 214                     int pc = 0;
 215                     int sr = 0;
 216
 217
 218                     switch (operand->shift)
 219                       {
 220                       case 0xffe00001: regs = list12_regs; break;
 221                       case 0xfff8000f: regs = list18_h_regs; break;
 222                       case 0xfff8001f: regs = list18_l_regs; value &= ~0x10; break;  /* Do not include magic bit */
 223                       default:
 224                         /* xgettext:c-format */
 225                         fprintf (stderr, _("unknown operand shift: %x\n"), operand->shift );
 226                         abort();
 227                       }
 228
 229                     for (i = 0; i < 32; i++)
 230                       {
 231                         if (value & (1 << i))
 232                           {
 233                             switch (regs[ i ])
 234                               {
 235                               default: mask |= (1 << regs[ i ]); break;
 236                                 /* xgettext:c-format */
 237                               case 0:  fprintf (stderr, _("unknown pop reg: %d\n"), i ); abort();
 238                               case -1: pc = 1; break;
 239                               case -2: sr = 1; break;
 240                               }
 241                           }
 242                       }
 243
 244                     info->fprintf_func (info->stream, "{");
 245
 246                     if (mask || pc || sr)
 247                       {
 248                         if (mask)
 249                           {
 250                             unsigned int bit;
 251                             int shown_one = 0;
 252
 253                             for (bit = 0; bit < 32; bit++)
 254                               if (mask & (1 << bit))
 255                                 {
 256                                   unsigned long int first = bit;
 257                                   unsigned long int last;
 258
 259                                   if (shown_one)
 260                                     info->fprintf_func (info->stream, ", ");
 261                                   else
 262                                     shown_one = 1;
 263
 264                                   info->fprintf_func (info->stream, v850_reg_names[first]);
 265
 266                                   for (bit++; bit < 32; bit++)
 267                                     if ((mask & (1 << bit)) == 0)
 268                                       break;
 269
 270                                   last = bit;
 271
 272                                   if (last > first + 1)
 273                                     {
 274                                       info->fprintf_func (info->stream, " - %s", v850_reg_names[ last - 1 ]);
 275                                     }
 276                                 }
 277                           }
 278
 279                         if (pc)
 280                           info->fprintf_func (info->stream, "%sPC", mask ? ", " : "");
 281                         if (sr)
 282                           info->fprintf_func (info->stream, "%sSR", (mask || pc) ? ", " : "");
 283                       }
 284
 285                     info->fprintf_func (info->stream, "}");
 286                   }
 287                 break;
 288
 289                 case V850E_IMMEDIATE16:
 290                   status = info->read_memory_func (memaddr + bytes_read, buffer, 2, info);
 291                   if (status == 0)
 292                     {
 293                       bytes_read += 2;
 294                       value = bfd_getl16 (buffer);
 295
 296                       /* If this is a DISPOSE instruction with ff set to 0x10, then shift value up by 16.  */
 297                       if ((insn & 0x001fffc0) == 0x00130780)
 298                         value <<= 16;
 299
 300                       info->fprintf_func (info->stream, "0x%x", value);
 301                     }
 302                   else
 303                     {
 304                       info->memory_error_func (status, memaddr + bytes_read, info);
 305                     }
 306                   break;
 307
 308                 case V850E_IMMEDIATE32:
 309                   status = info->read_memory_func (memaddr + bytes_read, buffer, 4, info);
 310                   if (status == 0)
 311                     {
 312                       bytes_read += 4;
 313                       value = bfd_getl32 (buffer);
 314                       info->fprintf_func (info->stream, "0x%lx", value);
 315                     }
 316                   else
 317                     {
 318                       info->memory_error_func (status, memaddr + bytes_read, info);
 319                     }
 320                   break;
 321                 }
 322
 323               /* Handle jmp correctly.  */
 324               if (memop == 1 && opnum == 1
 325                   && ((operand->flags & V850_OPERAND_REG) != 0))
 326                 (*info->fprintf_func) (info->stream, "]");
 327             }
 328
 329           /* Close any square bracket we left open.  */
 330           if (memop && opnum == memop + 2)
 331             (*info->fprintf_func) (info->stream, "]");
 332
 333           /* All done. */
 334           break;
 335         }
 336       op++;
 337     }
 338
 339   if (!match)
 340     {
 341       if (short_op)
 342         info->fprintf_func (info->stream, ".short\t0x%04x", insn);
 343       else
 344         info->fprintf_func (info->stream, ".long\t0x%08x", insn);
 345     }
 346
 347   return bytes_read;
 348 }
 349
 350 int
 351 print_insn_v850 (memaddr, info)
 352      bfd_vma memaddr;
 353      struct disassemble_info * info;
 354 {
 355   int status;
 356   bfd_byte buffer[4];
 357   unsigned long insn = 0;
 358
 359   /* First figure out how big the opcode is.  */
 360
 361   status = info->read_memory_func (memaddr, buffer, 2, info);
 362   if (status == 0)
 363     {
 364       insn = bfd_getl16 (buffer);
 365
 366       if (   (insn & 0x0600) == 0x0600
 367           && (insn & 0xffe0) != 0x0620)
 368         {
 369           /* If this is a 4 byte insn, read 4 bytes of stuff.  */
 370           status = info->read_memory_func (memaddr, buffer, 4, info);
 371
 372           if (status == 0)
 373             insn = bfd_getl32 (buffer);
 374         }
 375     }
 376
 377   if (status != 0)
 378     {
 379       info->memory_error_func (status, memaddr, info);
 380       return -1;
 381     }
 382
 383   /* Make sure we tell our caller how many bytes we consumed.  */
 384   return disassemble (memaddr, info, insn);
 385 }