opcodes/d10v-dis.c

   1 /* Disassemble D10V instructions.
   2    Copyright (C) 1996, 1997, 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
  19 #include <stdio.h>
  20
  21 #include "sysdep.h"
  22 #include "opcode/d10v.h"
  23 #include "dis-asm.h"
  24
  25 /* the PC wraps at 18 bits, except for the segment number */
  26 /* so use this mask to keep the parts we want */
  27 #define PC_MASK 0x0303FFFF
  28
  29 static void dis_2_short PARAMS ((unsigned long insn, bfd_vma memaddr,
  30                                  struct disassemble_info *info, int order));
  31 static void dis_long PARAMS ((unsigned long insn, bfd_vma memaddr,
  32                               struct disassemble_info *info));
  33
  34 int
  35 print_insn_d10v (memaddr, info)
  36      bfd_vma memaddr;
  37      struct disassemble_info *info;
  38 {
  39   int status;
  40   bfd_byte buffer[4];
  41   unsigned long insn;
  42
  43   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  44   if (status != 0)
  45     {
  46       (*info->memory_error_func) (status, memaddr, info);
  47       return -1;
  48     }
  49   insn = bfd_getb32 (buffer);
  50
  51   status = insn & FM11;
  52   switch (status) {
  53   case 0:
  54     dis_2_short (insn, memaddr, info, 2);
  55     break;
  56   case FM01:
  57     dis_2_short (insn, memaddr, info, 0);
  58     break;
  59   case FM10:
  60     dis_2_short (insn, memaddr, info, 1);
  61     break;
  62   case FM11:
  63     dis_long (insn, memaddr, info);
  64     break;
  65   }
  66   return 4;
  67 }
  68
  69 static void
  70 print_operand (oper, insn, op, memaddr, info)
  71      struct d10v_operand *oper;
  72      unsigned long insn;
  73      struct d10v_opcode *op;
  74      bfd_vma memaddr;
  75      struct disassemble_info *info;
  76 {
  77   int num, shift;
  78
  79   if (oper->flags == OPERAND_ATMINUS)
  80     {
  81       (*info->fprintf_func) (info->stream, "@-");
  82       return;
  83     }
  84   if (oper->flags == OPERAND_MINUS)
  85     {
  86       (*info->fprintf_func) (info->stream, "-");
  87       return;
  88     }
  89   if (oper->flags == OPERAND_PLUS)
  90     {
  91       (*info->fprintf_func) (info->stream, "+");
  92       return;
  93     }
  94   if (oper->flags == OPERAND_ATSIGN)
  95     {
  96       (*info->fprintf_func) (info->stream, "@");
  97       return;
  98     }
  99   if (oper->flags == OPERAND_ATPAR)
 100     {
 101       (*info->fprintf_func) (info->stream, "@(");
 102       return;
 103     }
 104
 105   shift = oper->shift;
 106
 107   /* the LONG_L format shifts registers over by 15 */
 108   if (op->format == LONG_L && (oper->flags & OPERAND_REG))
 109     shift += 15;
 110
 111   num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));
 112
 113   if (oper->flags & OPERAND_REG)
 114     {
 115       int i;
 116       int match=0;
 117       num += (oper->flags
 118               & (OPERAND_GPR|OPERAND_FFLAG|OPERAND_CFLAG|OPERAND_CONTROL));
 119       if (oper->flags & (OPERAND_ACC0|OPERAND_ACC1))
 120         num += num ? OPERAND_ACC1 : OPERAND_ACC0;
 121       for (i = 0; i < d10v_reg_name_cnt(); i++)
 122         {
 123           if (num == d10v_predefined_registers[i].value)
 124             {
 125               if (d10v_predefined_registers[i].pname)
 126                 (*info->fprintf_func) (info->stream, "%s",d10v_predefined_registers[i].pname);
 127               else
 128                 (*info->fprintf_func) (info->stream, "%s",d10v_predefined_registers[i].name);
 129               match=1;
 130               break;
 131             }
 132         }
 133       if (match == 0)
 134         {
 135           /* this would only get executed if a register was not in the
 136              register table */
 137           if (oper->flags & (OPERAND_ACC0|OPERAND_ACC1))
 138             (*info->fprintf_func) (info->stream, "a");
 139           else if (oper->flags & OPERAND_CONTROL)
 140             (*info->fprintf_func) (info->stream, "cr");
 141           else if(oper->flags & OPERAND_REG)
 142             (*info->fprintf_func) (info->stream, "r");
 143           (*info->fprintf_func) (info->stream, "%d",num);
 144         }
 145     }
 146   else
 147     {
 148       /* addresses are right-shifted by 2 */
 149       if (oper->flags & OPERAND_ADDR)
 150         {
 151           long max;
 152           int neg=0;
 153           max = (1 << (oper->bits - 1));
 154           if (num & max)
 155             {
 156               num = -num & ((1 << oper->bits)-1);
 157               neg = 1;
 158             }
 159           num = num<<2;
 160           if (info->flags & INSN_HAS_RELOC)
 161             (*info->print_address_func) (num & PC_MASK, info);
 162           else
 163             {
 164               if (neg)
 165                 (*info->print_address_func) ((memaddr - num) & PC_MASK, info);
 166               else
 167                 (*info->print_address_func) ((memaddr + num) & PC_MASK, info);
 168             }
 169         }
 170       else
 171         {
 172           if (oper->flags & OPERAND_SIGNED)
 173             {
 174               int max = (1 << (oper->bits - 1));
 175               if (num & max)
 176                 {
 177                   num = -num & ((1 << oper->bits)-1);
 178                   (*info->fprintf_func) (info->stream, "-");
 179                 }
 180             }
 181           (*info->fprintf_func) (info->stream, "0x%x",num);
 182         }
 183     }
 184 }
 185
 186
 187 static void
 188 dis_long (insn, memaddr, info)
 189      unsigned long insn;
 190      bfd_vma memaddr;
 191      struct disassemble_info *info;
 192 {
 193   int i;
 194   char buf[32];
 195   struct d10v_opcode *op = (struct d10v_opcode *)d10v_opcodes;
 196   struct d10v_operand *oper;
 197   int need_paren = 0;
 198   int match = 0;
 199
 200   while (op->name)
 201     {
 202       if ((op->format & LONG_OPCODE) && ((op->mask & insn) == op->opcode))
 203         {
 204           match = 1;
 205           (*info->fprintf_func) (info->stream, "%s\t", op->name);
 206           for ( i=0; op->operands[i]; i++)
 207             {
 208               oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];
 209               if (oper->flags == OPERAND_ATPAR)
 210                 need_paren = 1;
 211               print_operand (oper, insn, op, memaddr, info);
 212               if (op->operands[i+1] && oper->bits &&
 213                   d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&
 214                   d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)
 215                 (*info->fprintf_func) (info->stream, ", ");
 216             }
 217           break;
 218         }
 219       op++;
 220     }
 221
 222   if (!match)
 223     (*info->fprintf_func) (info->stream, ".long\t0x%08x",insn);
 224
 225   if (need_paren)
 226     (*info->fprintf_func) (info->stream, ")");
 227 }
 228
 229 static void
 230 dis_2_short (insn, memaddr, info, order)
 231      unsigned long insn;
 232      bfd_vma memaddr;
 233      struct disassemble_info *info;
 234      int order;
 235 {
 236   int i,j;
 237   char astr[2][32];
 238   unsigned int ins[2];
 239   struct d10v_opcode *op;
 240   char buf[32];
 241   int match, num_match=0;
 242   struct d10v_operand *oper;
 243   int need_paren = 0;
 244
 245   ins[0] = (insn & 0x3FFFFFFF) >> 15;
 246   ins[1] = insn & 0x00007FFF;
 247
 248   for(j=0;j<2;j++)
 249     {
 250       op = (struct d10v_opcode *)d10v_opcodes;
 251       match=0;
 252       while (op->name)
 253         {
 254           if ((op->format & SHORT_OPCODE) && ((op->mask & ins[j]) == op->opcode))
 255             {
 256               (*info->fprintf_func) (info->stream, "%s\t",op->name);
 257               for (i=0; op->operands[i]; i++)
 258                 {
 259                   oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];
 260                   if (oper->flags == OPERAND_ATPAR)
 261                     need_paren = 1;
 262                   print_operand (oper, ins[j], op, memaddr, info);
 263                   if (op->operands[i+1] && oper->bits &&
 264                   d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&
 265                   d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)
 266                     (*info->fprintf_func) (info->stream, ", ");
 267                 }
 268               match = 1;
 269               num_match++;
 270               break;
 271             }
 272           op++;
 273         }
 274       if (!match)
 275         (*info->fprintf_func) (info->stream, "unknown");
 276
 277       switch (order)
 278         {
 279         case 0:
 280           (*info->fprintf_func) (info->stream, "\t->\t");
 281           order = -1;
 282           break;
 283         case 1:
 284           (*info->fprintf_func) (info->stream, "\t<-\t");
 285           order = -1;
 286           break;
 287         case 2:
 288           (*info->fprintf_func) (info->stream, "\t||\t");
 289           order = -1;
 290           break;
 291         default:
 292           break;
 293         }
 294     }
 295
 296   if (num_match == 0)
 297     (*info->fprintf_func) (info->stream, ".long\t0x%08x",insn);
 298
 299   if (need_paren)
 300     (*info->fprintf_func) (info->stream, ")");
 301 }