gnu/dist/gdb6/opcodes/d10v-dis.c

   1 /* Disassemble D10V instructions.
   2    Copyright 1996, 1997, 1998, 2000, 2001, 2005 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., 51 Franklin Street - Fifth Floor, Boston,
  17    MA 02110-1301, USA.  */
  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
  30 print_operand (struct d10v_operand *oper,
  31                unsigned long insn,
  32                struct d10v_opcode *op,
  33                bfd_vma memaddr,
  34                struct disassemble_info *info)
  35 {
  36   int num, shift;
  37
  38   if (oper->flags == OPERAND_ATMINUS)
  39     {
  40       (*info->fprintf_func) (info->stream, "@-");
  41       return;
  42     }
  43   if (oper->flags == OPERAND_MINUS)
  44     {
  45       (*info->fprintf_func) (info->stream, "-");
  46       return;
  47     }
  48   if (oper->flags == OPERAND_PLUS)
  49     {
  50       (*info->fprintf_func) (info->stream, "+");
  51       return;
  52     }
  53   if (oper->flags == OPERAND_ATSIGN)
  54     {
  55       (*info->fprintf_func) (info->stream, "@");
  56       return;
  57     }
  58   if (oper->flags == OPERAND_ATPAR)
  59     {
  60       (*info->fprintf_func) (info->stream, "@(");
  61       return;
  62     }
  63
  64   shift = oper->shift;
  65
  66   /* The LONG_L format shifts registers over by 15.  */
  67   if (op->format == LONG_L && (oper->flags & OPERAND_REG))
  68     shift += 15;
  69
  70   num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));
  71
  72   if (oper->flags & OPERAND_REG)
  73     {
  74       int i;
  75       int match = 0;
  76
  77       num += (oper->flags
  78               & (OPERAND_GPR | OPERAND_FFLAG | OPERAND_CFLAG | OPERAND_CONTROL));
  79       if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
  80         num += num ? OPERAND_ACC1 : OPERAND_ACC0;
  81       for (i = 0; i < d10v_reg_name_cnt (); i++)
  82         {
  83           if (num == (d10v_predefined_registers[i].value & ~ OPERAND_SP))
  84             {
  85               if (d10v_predefined_registers[i].pname)
  86                 (*info->fprintf_func) (info->stream, "%s",
  87                                        d10v_predefined_registers[i].pname);
  88               else
  89                 (*info->fprintf_func) (info->stream, "%s",
  90                                        d10v_predefined_registers[i].name);
  91               match = 1;
  92               break;
  93             }
  94         }
  95       if (match == 0)
  96         {
  97           /* This would only get executed if a register was not in the
  98              register table.  */
  99           if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
 100             (*info->fprintf_func) (info->stream, "a");
 101           else if (oper->flags & OPERAND_CONTROL)
 102             (*info->fprintf_func) (info->stream, "cr");
 103           else if (oper->flags & OPERAND_REG)
 104             (*info->fprintf_func) (info->stream, "r");
 105           (*info->fprintf_func) (info->stream, "%d", num & REGISTER_MASK);
 106         }
 107     }
 108   else
 109     {
 110       /* Addresses are right-shifted by 2.  */
 111       if (oper->flags & OPERAND_ADDR)
 112         {
 113           long max;
 114           int neg = 0;
 115
 116           max = (1 << (oper->bits - 1));
 117           if (num & max)
 118             {
 119               num = -num & ((1 << oper->bits) - 1);
 120               neg = 1;
 121             }
 122           num = num << 2;
 123           if (info->flags & INSN_HAS_RELOC)
 124             (*info->print_address_func) (num & PC_MASK, info);
 125           else
 126             {
 127               if (neg)
 128                 (*info->print_address_func) ((memaddr - num) & PC_MASK, info);
 129               else
 130                 (*info->print_address_func) ((memaddr + num) & PC_MASK, info);
 131             }
 132         }
 133       else
 134         {
 135           if (oper->flags & OPERAND_SIGNED)
 136             {
 137               int max = (1 << (oper->bits - 1));
 138               if (num & max)
 139                 {
 140                   num = -num & ((1 << oper->bits) - 1);
 141                   (*info->fprintf_func) (info->stream, "-");
 142                 }
 143             }
 144           (*info->fprintf_func) (info->stream, "0x%x", num);
 145         }
 146     }
 147 }
 148
 149 static void
 150 dis_long (unsigned long insn,
 151           bfd_vma memaddr,
 152           struct disassemble_info *info)
 153 {
 154   int i;
 155   struct d10v_opcode *op = (struct d10v_opcode *) d10v_opcodes;
 156   struct d10v_operand *oper;
 157   int need_paren = 0;
 158   int match = 0;
 159
 160   while (op->name)
 161     {
 162       if ((op->format & LONG_OPCODE)
 163           && ((op->mask & insn) == (unsigned long) op->opcode))
 164         {
 165           match = 1;
 166           (*info->fprintf_func) (info->stream, "%s\t", op->name);
 167
 168           for (i = 0; op->operands[i]; i++)
 169             {
 170               oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
 171               if (oper->flags == OPERAND_ATPAR)
 172                 need_paren = 1;
 173               print_operand (oper, insn, op, memaddr, info);
 174               if (op->operands[i + 1] && oper->bits
 175                   && d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
 176                   && d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
 177                 (*info->fprintf_func) (info->stream, ", ");
 178             }
 179           break;
 180         }
 181       op++;
 182     }
 183
 184   if (!match)
 185     (*info->fprintf_func) (info->stream, ".long\t0x%08lx", insn);
 186
 187   if (need_paren)
 188     (*info->fprintf_func) (info->stream, ")");
 189 }
 190
 191 static void
 192 dis_2_short (unsigned long insn,
 193              bfd_vma memaddr,
 194              struct disassemble_info *info,
 195              int order)
 196 {
 197   int i, j;
 198   unsigned int ins[2];
 199   struct d10v_opcode *op;
 200   int match, num_match = 0;
 201   struct d10v_operand *oper;
 202   int need_paren = 0;
 203
 204   ins[0] = (insn & 0x3FFFFFFF) >> 15;
 205   ins[1] = insn & 0x00007FFF;
 206
 207   for (j = 0; j < 2; j++)
 208     {
 209       op = (struct d10v_opcode *) d10v_opcodes;
 210       match = 0;
 211       while (op->name)
 212         {
 213           if ((op->format & SHORT_OPCODE)
 214               && ((((unsigned int) op->mask) & ins[j])
 215                   == (unsigned int) op->opcode))
 216             {
 217               (*info->fprintf_func) (info->stream, "%s\t", op->name);
 218               for (i = 0; op->operands[i]; i++)
 219                 {
 220                   oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
 221                   if (oper->flags == OPERAND_ATPAR)
 222                     need_paren = 1;
 223                   print_operand (oper, ins[j], op, memaddr, info);
 224                   if (op->operands[i + 1] && oper->bits
 225                       && d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
 226                       && d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
 227                     (*info->fprintf_func) (info->stream, ", ");
 228                 }
 229               match = 1;
 230               num_match++;
 231               break;
 232             }
 233           op++;
 234         }
 235       if (!match)
 236         (*info->fprintf_func) (info->stream, "unknown");
 237
 238       switch (order)
 239         {
 240         case 0:
 241           (*info->fprintf_func) (info->stream, "\t->\t");
 242           order = -1;
 243           break;
 244         case 1:
 245           (*info->fprintf_func) (info->stream, "\t<-\t");
 246           order = -1;
 247           break;
 248         case 2:
 249           (*info->fprintf_func) (info->stream, "\t||\t");
 250           order = -1;
 251           break;
 252         default:
 253           break;
 254         }
 255     }
 256
 257   if (num_match == 0)
 258     (*info->fprintf_func) (info->stream, ".long\t0x%08lx", insn);
 259
 260   if (need_paren)
 261     (*info->fprintf_func) (info->stream, ")");
 262 }
 263
 264 int
 265 print_insn_d10v (bfd_vma memaddr, struct disassemble_info *info)
 266 {
 267   int status;
 268   bfd_byte buffer[4];
 269   unsigned long insn;
 270
 271   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
 272   if (status != 0)
 273     {
 274       (*info->memory_error_func) (status, memaddr, info);
 275       return -1;
 276     }
 277   insn = bfd_getb32 (buffer);
 278
 279   status = insn & FM11;
 280   switch (status)
 281     {
 282     case 0:
 283       dis_2_short (insn, memaddr, info, 2);
 284       break;
 285     case FM01:
 286       dis_2_short (insn, memaddr, info, 0);
 287       break;
 288     case FM10:
 289       dis_2_short (insn, memaddr, info, 1);
 290       break;
 291     case FM11:
 292       dis_long (insn, memaddr, info);
 293       break;
 294     }
 295   return 4;
 296 }