OpenCores
URL https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk

Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [opcodes/] [or32-dis.c] - Blame information for rev 635

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 227 jeremybenn 
/* Instruction printing code for the OpenRISC 1000
2 
   Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc.
3 
   Contributed by Damjan Lampret <lampret@opencores.org>.
4 
   Modified from a29k port.
5 
 
6 
   This file is part of the GNU opcodes library.
7 
 
8 
   This library is free software; you can redistribute it and/or modify
9 
   it under the terms of the GNU General Public License as published by
10 
   the Free Software Foundation; either version 3, or (at your option)
11 
   any later version.
12 
 
13 
   It is distributed in the hope that it will be useful, but WITHOUT
14 
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
16 
   License for more details.
17 
 
18 
   You should have received a copy of the GNU General Public License
19 
   along with this program; if not, write to the Free Software
20 
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 
   MA 02110-1301, USA.  */
22 
 
23 
#define DEBUG 0
24 
 
25 
#include "dis-asm.h"
26 
#include "opcode/or32.h"
27 
#include "safe-ctype.h"
28 
#include <string.h>
29 
#include <stdlib.h>
30 
 
31 
#define EXTEND29(x) ((x) & (unsigned long) 0x10000000 ? ((x) | (unsigned long) 0xf0000000) : ((x)))
32 
 
33 
/* Now find the four bytes of INSN_CH and put them in *INSN.  */
34 
 
35 
static void
36 
find_bytes_big (unsigned char *insn_ch, unsigned long *insn)
37 
{
38 
  *insn =
39 
    ((unsigned long) insn_ch[0] << 24) +
40 
    ((unsigned long) insn_ch[1] << 16) +
41 
    ((unsigned long) insn_ch[2] << 8) +
42 
    ((unsigned long) insn_ch[3]);
43 
#if DEBUG
44 
  printf ("find_bytes_big3: %x\n", *insn);
45 
#endif
46 
}
47 
 
48 
static void
49 
find_bytes_little (unsigned char *insn_ch, unsigned long *insn)
50 
{
51 
  *insn =
52 
    ((unsigned long) insn_ch[3] << 24) +
53 
    ((unsigned long) insn_ch[2] << 16) +
54 
    ((unsigned long) insn_ch[1] << 8) +
55 
    ((unsigned long) insn_ch[0]);
56 
}
57 
 
58 
typedef void (*find_byte_func_type) (unsigned char *, unsigned long *);
59 
 
60 
static unsigned long
61 
or32_extract (char param_ch, char *enc_initial, unsigned long insn)
62 
{
63 
  char *enc;
64 
  unsigned long ret = 0;
65 
  int opc_pos = 0;
66 
  int param_pos = 0;
67 
 
68 
  for (enc = enc_initial; *enc != '\0'; enc++)
69 
    if (*enc == param_ch)
70 
      {
71 
        if (enc - 2 >= enc_initial && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
72 
          continue;
73 
        else
74 
          param_pos++;
75 
      }
76 
 
77 
#if DEBUG
78 
  printf ("or32_extract: %c %x ", param_ch, param_pos);
79 
#endif
80 
  opc_pos = 32;
81 
 
82 
  for (enc = enc_initial; *enc != '\0'; )
83 
    if ((*enc == '0') && (*(enc + 1) == 'x'))
84 
      {
85 
        opc_pos -= 4;
86 
 
87 
        if ((param_ch == '0') || (param_ch == '1'))
88 
          {
89 
            unsigned long tmp = strtoul (enc, NULL, 16);
90 
#if DEBUG
91 
            printf (" enc=%s, tmp=%x ", enc, tmp);
92 
#endif
93 
            if (param_ch == '0')
94 
              tmp = 15 - tmp;
95 
            ret |= tmp << opc_pos;
96 
          }
97 
        enc += 3;
98 
      }
99 
    else if ((*enc == '0') || (*enc == '1'))
100 
      {
101 
        opc_pos--;
102 
        if (param_ch == *enc)
103 
          ret |= 1 << opc_pos;
104 
        enc++;
105 
      }
106 
    else if (*enc == param_ch)
107 
      {
108 
        opc_pos--;
109 
        param_pos--;
110 
#if DEBUG
111 
        printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n", ret, opc_pos, param_pos);
112 
#endif
113 
        ret += ((insn >> opc_pos) & 0x1) << param_pos;
114 
 
115 
        if (!param_pos
116 
            && letter_signed (param_ch)
117 
            && ret >> (letter_range (param_ch) - 1))
118 
          {
119 
#if DEBUG
120 
            printf ("\n  ret=%x opc_pos=%x, param_pos=%x\n",
121 
                    ret, opc_pos, param_pos);
122 
#endif
123 
            ret |= 0xffffffff << letter_range(param_ch);
124 
#if DEBUG
125 
            printf ("\n  after conversion to signed: ret=%x\n", ret);
126 
#endif
127 
          }
128 
        enc++;
129 
      }
130 
    else if (ISALPHA (*enc))
131 
      {
132 
        opc_pos--;
133 
        enc++;
134 
      }
135 
    else if (*enc == '-')
136 
      {
137 
        opc_pos--;
138 
        enc++;
139 
      }
140 
    else
141 
      enc++;
142 
 
143 
#if DEBUG
144 
  printf ("ret=%x\n", ret);
145 
#endif
146 
  return ret;
147 
}
148 
 
149 
static int
150 
or32_opcode_match (unsigned long insn, char *encoding)
151 
{
152 
  unsigned long ones, zeros;
153 
 
154 
#if DEBUG
155 
  printf ("or32_opcode_match: %.8lx\n", insn);
156 
#endif
157 
  ones  = or32_extract ('1', encoding, insn);
158 
  zeros = or32_extract ('0', encoding, insn);
159 
 
160 
#if DEBUG
161 
  printf ("ones: %x \n", ones);
162 
  printf ("zeros: %x \n", zeros);
163 
#endif
164 
  if ((insn & ones) != ones)
165 
    {
166 
#if DEBUG
167 
      printf ("ret1\n");
168 
#endif
169 
      return 0;
170 
    }
171 
 
172 
  if ((~insn & zeros) != zeros)
173 
    {
174 
#if DEBUG
175 
      printf ("ret2\n");
176 
#endif
177 
      return 0;
178 
    }
179 
 
180 
#if DEBUG
181 
  printf ("ret3\n");
182 
#endif
183 
  return 1;
184 
}
185 
 
186 
/* Print register to INFO->STREAM. Used only by print_insn.  */
187 
 
188 
static void
189 
or32_print_register (char param_ch,
190 
                     char *encoding,
191 
                     unsigned long insn,
192 
                     struct disassemble_info *info)
193 
{
194 
  int regnum = or32_extract (param_ch, encoding, insn);
195 
 
196 
#if DEBUG
197 
  printf ("or32_print_register: %c, %s, %x\n", param_ch, encoding, insn);
198 
#endif
199 
  if (param_ch == 'A')
200 
    (*info->fprintf_func) (info->stream, "r%d", regnum);
201 
  else if (param_ch == 'B')
202 
    (*info->fprintf_func) (info->stream, "r%d", regnum);
203 
  else if (param_ch == 'D')
204 
    (*info->fprintf_func) (info->stream, "r%d", regnum);
205 
  else if (regnum < 16)
206 
    (*info->fprintf_func) (info->stream, "r%d", regnum);
207 
  else if (regnum < 32)
208 
    (*info->fprintf_func) (info->stream, "r%d", regnum-16);
209 
  else
210 
    (*info->fprintf_func) (info->stream, "X%d", regnum);
211 
}
212 
 
213 
/* Print immediate to INFO->STREAM. Used only by print_insn.  */
214 
 
215 
static void
216 
or32_print_immediate (char param_ch,
217 
                      char *encoding,
218 
                      unsigned long insn,
219 
                      struct disassemble_info *info)
220 
{
221 
  int imm = or32_extract(param_ch, encoding, insn);
222 
 
223 
  if (letter_signed(param_ch))
224 
    (*info->fprintf_func) (info->stream, "0x%x", imm);
225 
/*    (*info->fprintf_func) (info->stream, "%d", imm); */
226 
  else
227 
    (*info->fprintf_func) (info->stream, "0x%x", imm);
228 
}
229 
 
230 
/* Print one instruction from MEMADDR on INFO->STREAM.
231 
   Return the size of the instruction (always 4 on or32).  */
232 
 
233 
static int
234 
print_insn (bfd_vma memaddr, struct disassemble_info *info)
235 
{
236 
  /* The raw instruction.  */
237 
  unsigned char insn_ch[4];
238 
  /* Address. Will be sign extened 27-bit.  */
239 
  unsigned long addr;
240 
  /* The four bytes of the instruction.  */
241 
  unsigned long insn;
242 
  find_byte_func_type find_byte_func = (find_byte_func_type) info->private_data;
243 
  struct or32_opcode const * opcode;
244 
 
245 
  {
246 
    int status =
247 
      (*info->read_memory_func) (memaddr, (bfd_byte *) &insn_ch[0], 4, info);
248 
 
249 
    if (status != 0)
250 
      {
251 
        (*info->memory_error_func) (status, memaddr, info);
252 
        return -1;
253 
      }
254 
  }
255 
 
256 
  (*find_byte_func) (&insn_ch[0], &insn);
257 
 
258 
  for (opcode = &or32_opcodes[0];
259 
       opcode < &or32_opcodes[or32_num_opcodes];
260 
       ++opcode)
261 
    {
262 
      if (or32_opcode_match (insn, opcode->encoding))
263 
        {
264 
          char *s;
265 
 
266 
          (*info->fprintf_func) (info->stream, "%s ", opcode->name);
267 
 
268 
          for (s = opcode->args; *s != '\0'; ++s)
269 
            {
270 
              switch (*s)
271 
                {
272 
                case '\0':
273 
                  return 4;
274 
 
275 
                case 'r':
276 
                  or32_print_register (*++s, opcode->encoding, insn, info);
277 
                  break;
278 
 
279 
                case 'X':
280 
                  addr = or32_extract ('X', opcode->encoding, insn) << 2;
281 
 
282 
                  /* Calulate the correct address.  XXX is this really correct ??  */
283 
                  addr = memaddr + EXTEND29 (addr);
284 
 
285 
                  (*info->print_address_func)
286 
                    (addr, info);
287 
                  break;
288 
 
289 
                default:
290 
                  if (strchr (opcode->encoding, *s))
291 
                    or32_print_immediate (*s, opcode->encoding, insn, info);
292 
                  else
293 
                    (*info->fprintf_func) (info->stream, "%c", *s);
294 
                }
295 
            }
296 
 
297 
          return 4;
298 
        }
299 
    }
300 
 
301 
  /* This used to be %8x for binutils.  */
302 
  (*info->fprintf_func)
303 
    (info->stream, ".word 0x%08lx", insn);
304 
  return 4;
305 
}
306 
 
307 
/* Disassemble a big-endian or32 instruction.  */
308 
 
309 
int
310 
print_insn_big_or32 (bfd_vma memaddr, struct disassemble_info *info)
311 
{
312 
  info->private_data = find_bytes_big;
313 
 
314 
  return print_insn (memaddr, info);
315 
}
316 
 
317 
/* Disassemble a little-endian or32 instruction.  */
318 
 
319 
int
320 
print_insn_little_or32 (bfd_vma memaddr, struct disassemble_info *info)
321 
{
322 
  info->private_data = find_bytes_little;
323 
  return print_insn (memaddr, info);
324 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.