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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [d10v-dis.c] - Blame information for rev 308

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1 24 jeremybenn 
/* Disassemble D10V instructions.
2 
   Copyright 1996, 1997, 1998, 2000, 2001, 2005, 2007
3 
   Free Software Foundation, Inc.
4 
 
5 
   This file is part of the GNU opcodes library.
6 
 
7 
   This library is free software; you can redistribute it and/or modify
8 
   it under the terms of the GNU General Public License as published by
9 
   the Free Software Foundation; either version 3, or (at your option)
10 
   any later version.
11 
 
12 
   It is distributed in the hope that it will be useful, but WITHOUT
13 
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15 
   License for more details.
16 
 
17 
   You should have received a copy of the GNU General Public License
18 
   along with this program; if not, write to the Free Software
19 
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 
   MA 02110-1301, USA.  */
21 
 
22 
#include <stdio.h>
23 
 
24 
#include "sysdep.h"
25 
#include "opcode/d10v.h"
26 
#include "dis-asm.h"
27 
 
28 
/* The PC wraps at 18 bits, except for the segment number,
29 
   so use this mask to keep the parts we want.  */
30 
#define PC_MASK 0x0303FFFF
31 
 
32 
static void
33 
print_operand (struct d10v_operand *oper,
34 
               unsigned long insn,
35 
               struct d10v_opcode *op,
36 
               bfd_vma memaddr,
37 
               struct disassemble_info *info)
38 
{
39 
  int num, shift;
40 
 
41 
  if (oper->flags == OPERAND_ATMINUS)
42 
    {
43 
      (*info->fprintf_func) (info->stream, "@-");
44 
      return;
45 
    }
46 
  if (oper->flags == OPERAND_MINUS)
47 
    {
48 
      (*info->fprintf_func) (info->stream, "-");
49 
      return;
50 
    }
51 
  if (oper->flags == OPERAND_PLUS)
52 
    {
53 
      (*info->fprintf_func) (info->stream, "+");
54 
      return;
55 
    }
56 
  if (oper->flags == OPERAND_ATSIGN)
57 
    {
58 
      (*info->fprintf_func) (info->stream, "@");
59 
      return;
60 
    }
61 
  if (oper->flags == OPERAND_ATPAR)
62 
    {
63 
      (*info->fprintf_func) (info->stream, "@(");
64 
      return;
65 
    }
66 
 
67 
  shift = oper->shift;
68 
 
69 
  /* The LONG_L format shifts registers over by 15.  */
70 
  if (op->format == LONG_L && (oper->flags & OPERAND_REG))
71 
    shift += 15;
72 
 
73 
  num = (insn >> shift) & (0x7FFFFFFF >> (31 - oper->bits));
74 
 
75 
  if (oper->flags & OPERAND_REG)
76 
    {
77 
      int i;
78 
      int match = 0;
79 
 
80 
      num += (oper->flags
81 
              & (OPERAND_GPR | OPERAND_FFLAG | OPERAND_CFLAG | OPERAND_CONTROL));
82 
      if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
83 
        num += num ? OPERAND_ACC1 : OPERAND_ACC0;
84 
      for (i = 0; i < d10v_reg_name_cnt (); i++)
85 
        {
86 
          if (num == (d10v_predefined_registers[i].value & ~ OPERAND_SP))
87 
            {
88 
              if (d10v_predefined_registers[i].pname)
89 
                (*info->fprintf_func) (info->stream, "%s",
90 
                                       d10v_predefined_registers[i].pname);
91 
              else
92 
                (*info->fprintf_func) (info->stream, "%s",
93 
                                       d10v_predefined_registers[i].name);
94 
              match = 1;
95 
              break;
96 
            }
97 
        }
98 
      if (match == 0)
99 
        {
100 
          /* This would only get executed if a register was not in the
101 
             register table.  */
102 
          if (oper->flags & (OPERAND_ACC0 | OPERAND_ACC1))
103 
            (*info->fprintf_func) (info->stream, "a");
104 
          else if (oper->flags & OPERAND_CONTROL)
105 
            (*info->fprintf_func) (info->stream, "cr");
106 
          else if (oper->flags & OPERAND_REG)
107 
            (*info->fprintf_func) (info->stream, "r");
108 
          (*info->fprintf_func) (info->stream, "%d", num & REGISTER_MASK);
109 
        }
110 
    }
111 
  else
112 
    {
113 
      /* Addresses are right-shifted by 2.  */
114 
      if (oper->flags & OPERAND_ADDR)
115 
        {
116 
          long max;
117 
          int neg = 0;
118 
 
119 
          max = (1 << (oper->bits - 1));
120 
          if (num & max)
121 
            {
122 
              num = -num & ((1 << oper->bits) - 1);
123 
              neg = 1;
124 
            }
125 
          num = num << 2;
126 
          if (info->flags & INSN_HAS_RELOC)
127 
            (*info->print_address_func) (num & PC_MASK, info);
128 
          else
129 
            {
130 
              if (neg)
131 
                (*info->print_address_func) ((memaddr - num) & PC_MASK, info);
132 
              else
133 
                (*info->print_address_func) ((memaddr + num) & PC_MASK, info);
134 
            }
135 
        }
136 
      else
137 
        {
138 
          if (oper->flags & OPERAND_SIGNED)
139 
            {
140 
              int max = (1 << (oper->bits - 1));
141 
              if (num & max)
142 
                {
143 
                  num = -num & ((1 << oper->bits) - 1);
144 
                  (*info->fprintf_func) (info->stream, "-");
145 
                }
146 
            }
147 
          (*info->fprintf_func) (info->stream, "0x%x", num);
148 
        }
149 
    }
150 
}
151 
 
152 
static void
153 
dis_long (unsigned long insn,
154 
          bfd_vma memaddr,
155 
          struct disassemble_info *info)
156 
{
157 
  int i;
158 
  struct d10v_opcode *op = (struct d10v_opcode *) d10v_opcodes;
159 
  struct d10v_operand *oper;
160 
  int need_paren = 0;
161 
  int match = 0;
162 
 
163 
  while (op->name)
164 
    {
165 
      if ((op->format & LONG_OPCODE)
166 
          && ((op->mask & insn) == (unsigned long) op->opcode))
167 
        {
168 
          match = 1;
169 
          (*info->fprintf_func) (info->stream, "%s\t", op->name);
170 
 
171 
          for (i = 0; op->operands[i]; i++)
172 
            {
173 
              oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
174 
              if (oper->flags == OPERAND_ATPAR)
175 
                need_paren = 1;
176 
              print_operand (oper, insn, op, memaddr, info);
177 
              if (op->operands[i + 1] && oper->bits
178 
                  && d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
179 
                  && d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
180 
                (*info->fprintf_func) (info->stream, ", ");
181 
            }
182 
          break;
183 
        }
184 
      op++;
185 
    }
186 
 
187 
  if (!match)
188 
    (*info->fprintf_func) (info->stream, ".long\t0x%08lx", insn);
189 
 
190 
  if (need_paren)
191 
    (*info->fprintf_func) (info->stream, ")");
192 
}
193 
 
194 
static void
195 
dis_2_short (unsigned long insn,
196 
             bfd_vma memaddr,
197 
             struct disassemble_info *info,
198 
             int order)
199 
{
200 
  int i, j;
201 
  unsigned int ins[2];
202 
  struct d10v_opcode *op;
203 
  int match, num_match = 0;
204 
  struct d10v_operand *oper;
205 
  int need_paren = 0;
206 
 
207 
  ins[0] = (insn & 0x3FFFFFFF) >> 15;
208 
  ins[1] = insn & 0x00007FFF;
209 
 
210 
  for (j = 0; j < 2; j++)
211 
    {
212 
      op = (struct d10v_opcode *) d10v_opcodes;
213 
      match = 0;
214 
      while (op->name)
215 
        {
216 
          if ((op->format & SHORT_OPCODE)
217 
              && ((((unsigned int) op->mask) & ins[j])
218 
                  == (unsigned int) op->opcode))
219 
            {
220 
              (*info->fprintf_func) (info->stream, "%s\t", op->name);
221 
              for (i = 0; op->operands[i]; i++)
222 
                {
223 
                  oper = (struct d10v_operand *) &d10v_operands[op->operands[i]];
224 
                  if (oper->flags == OPERAND_ATPAR)
225 
                    need_paren = 1;
226 
                  print_operand (oper, ins[j], op, memaddr, info);
227 
                  if (op->operands[i + 1] && oper->bits
228 
                      && d10v_operands[op->operands[i + 1]].flags != OPERAND_PLUS
229 
                      && d10v_operands[op->operands[i + 1]].flags != OPERAND_MINUS)
230 
                    (*info->fprintf_func) (info->stream, ", ");
231 
                }
232 
              match = 1;
233 
              num_match++;
234 
              break;
235 
            }
236 
          op++;
237 
        }
238 
      if (!match)
239 
        (*info->fprintf_func) (info->stream, "unknown");
240 
 
241 
      switch (order)
242 
        {
243 
        case 0:
244 
          (*info->fprintf_func) (info->stream, "\t->\t");
245 
          order = -1;
246 
          break;
247 
        case 1:
248 
          (*info->fprintf_func) (info->stream, "\t<-\t");
249 
          order = -1;
250 
          break;
251 
        case 2:
252 
          (*info->fprintf_func) (info->stream, "\t||\t");
253 
          order = -1;
254 
          break;
255 
        default:
256 
          break;
257 
        }
258 
    }
259 
 
260 
  if (num_match == 0)
261 
    (*info->fprintf_func) (info->stream, ".long\t0x%08lx", insn);
262 
 
263 
  if (need_paren)
264 
    (*info->fprintf_func) (info->stream, ")");
265 
}
266 
 
267 
int
268 
print_insn_d10v (bfd_vma memaddr, struct disassemble_info *info)
269 
{
270 
  int status;
271 
  bfd_byte buffer[4];
272 
  unsigned long insn;
273 
 
274 
  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
275 
  if (status != 0)
276 
    {
277 
      (*info->memory_error_func) (status, memaddr, info);
278 
      return -1;
279 
    }
280 
  insn = bfd_getb32 (buffer);
281 
 
282 
  status = insn & FM11;
283 
  switch (status)
284 
    {
285 
    case 0:
286 
      dis_2_short (insn, memaddr, info, 2);
287 
      break;
288 
    case FM01:
289 
      dis_2_short (insn, memaddr, info, 0);
290 
      break;
291 
    case FM10:
292 
      dis_2_short (insn, memaddr, info, 1);
293 
      break;
294 
    case FM11:
295 
      dis_long (insn, memaddr, info);
296 
      break;
297 
    }
298 
  return 4;
299 
}

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