opcodes/d10v-dis.c

   1 /* Disassemble D10V instructions.
   2    Copyright (C) 1996 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 "opcode/d10v.h"
  22 #include "dis-asm.h"
  23
  24 static void dis_2_short PARAMS ((unsigned long insn, char *str, int order));
  25 static void dis_long PARAMS ((unsigned long insn, char *str));
  26
  27 int
  28 print_insn_d10v (memaddr, info)
  29      bfd_vma memaddr;
  30      struct disassemble_info *info;
  31 {
  32   int status;
  33   bfd_byte buffer[4];
  34   unsigned long insn;
  35   char str[64];
  36
  37   strcpy (str, "unknown");
  38
  39   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  40   if (status != 0)
  41     {
  42       (*info->memory_error_func) (status, memaddr, info);
  43       return -1;
  44     }
  45   insn = bfd_getb32 (buffer);
  46
  47   status = insn & FM11;
  48   switch (status) {
  49   case 0:
  50     dis_2_short (insn, str, 2);
  51     break;
  52   case FM01:
  53     dis_2_short (insn, str, 0);
  54     break;
  55   case FM10:
  56     dis_2_short (insn, str, 1);
  57     break;
  58   case FM11:
  59     dis_long (insn, str);
  60     break;
  61   }
  62   (*info->fprintf_func) (info->stream, "\t%s", str, insn);
  63   return 4;
  64 }
  65
  66 static void
  67 print_operand (buf, oper, insn, op)
  68      char *buf;
  69      struct d10v_operand *oper;
  70      unsigned long insn;
  71      struct d10v_opcode *op;
  72 {
  73   int num, shift;
  74
  75   if (oper->flags == OPERAND_ATMINUS)
  76     {
  77       strcpy (buf,"@-");
  78       return;
  79     }
  80   if (oper->flags == OPERAND_MINUS)
  81     {
  82       strcpy (buf,"-");
  83       return;
  84     }
  85   if (oper->flags == OPERAND_PLUS)
  86     {
  87       strcpy (buf,"+");
  88       return;
  89     }
  90   if (oper->flags == OPERAND_ATSIGN)
  91     {
  92       strcpy (buf,"@");
  93       return;
  94     }
  95   if (oper->flags == OPERAND_ATPAR)
  96     {
  97       strcpy (buf,"@(");
  98       return;
  99     }
 100
 101   shift = oper->shift;
 102
 103   /* the LONG_L format shifts registers over by 15 */
 104   if (op->format == LONG_L && (oper->flags & OPERAND_REG))
 105     shift += 15;
 106
 107   num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));
 108
 109   if (oper->flags & OPERAND_REG)
 110     {
 111       int i;
 112       int match=0;
 113       num += oper->flags & (OPERAND_ACC|OPERAND_FLAG|OPERAND_CONTROL);
 114       for (i=0;i<reg_name_cnt();i++)
 115         {
 116           if (num == pre_defined_registers[i].value)
 117             {
 118               if (pre_defined_registers[i].pname)
 119                 strcpy(buf,pre_defined_registers[i].pname);
 120               else
 121                 strcpy(buf,pre_defined_registers[i].name);
 122               match=1;
 123               break;
 124             }
 125         }
 126       if (match==0)
 127         {
 128           if (oper->flags & OPERAND_ACC)
 129             *buf++ = 'a';
 130           else if (oper->flags & OPERAND_CONTROL)
 131             {
 132               *buf++ ='c';
 133               *buf++ ='r';
 134             }
 135           else if(oper->flags & OPERAND_REG)
 136             *buf++ = 'r';
 137           sprintf (buf, "%d", num);
 138         }
 139     }
 140   else
 141     sprintf (buf, "0x%x", num);
 142 }
 143
 144
 145 static void
 146 dis_long (insn, str)
 147      unsigned long insn;
 148      char *str;
 149 {
 150   int i;
 151   char buf[32];
 152   struct d10v_opcode *op = (struct d10v_opcode *)d10v_opcodes;
 153   struct d10v_operand *oper;
 154   int need_paren = 0;
 155
 156   while (op->name)
 157     {
 158       if ((op->format & LONG_OPCODE) && ((op->mask & insn) == op->opcode))
 159         {
 160           strcpy (str, op->name);
 161           strcat (str, "\t");
 162           for ( i=0; op->operands[i]; i++)
 163             {
 164               oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];
 165               if (oper->flags == OPERAND_ATPAR)
 166                 need_paren = 1;
 167               print_operand (buf, oper, insn, op);
 168               strcat (str, buf);
 169               if (op->operands[i+1] && oper->bits &&
 170                   d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&
 171                   d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)
 172                 strcat (str,", ");
 173             }
 174           break;
 175         }
 176       op++;
 177     }
 178   if (need_paren)
 179     strcat (str, ")");
 180 }
 181
 182 static void
 183 dis_2_short (insn, str, order)
 184      unsigned long insn;
 185      char *str;
 186      int order;
 187 {
 188   int i,j;
 189   char astr[2][32];
 190   unsigned int ins[2];
 191   struct d10v_opcode *op;
 192   char buf[32];
 193   int match, num_match=0;
 194   struct d10v_operand *oper;
 195   int need_paren = 0;
 196
 197   ins[0] = (insn & 0x3FFFFFFF) >> 15;
 198   ins[1] = insn & 0x00007FFF;
 199
 200   *str = 0;
 201
 202   for(j=0;j<2;j++)
 203     {
 204       op = (struct d10v_opcode *)d10v_opcodes;
 205       match=0;
 206       while (op->name)
 207         {
 208           if ((op->format & SHORT_OPCODE) && ((op->mask & ins[j]) == op->opcode))
 209             {
 210               strcat (str, op->name);
 211               strcat (str, "\t");
 212               for (i=0; op->operands[i]; i++)
 213                 {
 214                   oper = (struct d10v_operand *)&d10v_operands[op->operands[i]];
 215                   if (oper->flags == OPERAND_ATPAR)
 216                     need_paren = 1;
 217                   print_operand (buf, oper, ins[j], op);
 218                   strcat (str, buf);
 219                   if (op->operands[i+1] && oper->bits &&
 220                   d10v_operands[op->operands[i+1]].flags != OPERAND_PLUS &&
 221                   d10v_operands[op->operands[i+1]].flags != OPERAND_MINUS)
 222                     strcat( str,", ");
 223                 }
 224               match = 1;
 225               num_match++;
 226               break;
 227             }
 228           op++;
 229         }
 230       if (!match)
 231           strcat (str, "unknown");
 232
 233       switch (order)
 234         {
 235         case 0:
 236           strcat ( str, "\t->\t");
 237           order = -1;
 238           break;
 239         case 1:
 240           strcat (str, "\t<-\t");
 241           order = -1;
 242           break;
 243         case 2:
 244           strcat (str, "\t||\t");
 245           order = -1;
 246           break;
 247         default:
 248           break;
 249         }
 250     }
 251
 252   if (num_match == 0)
 253     sprintf (str, ".long\t0x%08x", insn);
 254
 255   if (need_paren)
 256     strcat (str, ")");
 257 }