OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [opcodes/] [pj-dis.c] - Blame information for rev 841

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 330 jeremybenn
/* pj-dis.c -- Disassemble picoJava instructions.
2
   Copyright 1999, 2000, 2001, 2002, 2005, 2007 Free Software Foundation, Inc.
3
   Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
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
#include "sysdep.h"
24
#include "opcode/pj.h"
25
#include "dis-asm.h"
26
 
27
extern const pj_opc_info_t pj_opc_info[512];
28
 
29
static int
30
get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
31
{
32
  unsigned char ival[4];
33
  int status = info->read_memory_func (memaddr, ival, 4, info);
34
 
35
  *iptr = (ival[0] << 24)
36
    | (ival[1] << 16)
37
    | (ival[2] << 8)
38
    | (ival[3] << 0);
39
 
40
  return status;
41
}
42
 
43
int
44
print_insn_pj (bfd_vma addr, struct disassemble_info *info)
45
{
46
  fprintf_ftype fprintf_fn = info->fprintf_func;
47
  void *stream = info->stream;
48
  unsigned char opcode;
49
  int status;
50
 
51
  if ((status = info->read_memory_func (addr, &opcode, 1, info)))
52
    goto fail;
53
 
54
  if (opcode == 0xff)
55
    {
56
      unsigned char byte_2;
57
 
58
      if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
59
        goto fail;
60
      fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
61
      return 2;
62
    }
63
  else
64
    {
65
      char *sep = "\t";
66
      int insn_start = addr;
67
      const pj_opc_info_t *op = &pj_opc_info[opcode];
68
      int a;
69
 
70
      addr++;
71
      fprintf_fn (stream, "%s", op->u.name);
72
 
73
      /* The tableswitch instruction is followed by the default
74
         address, low value, high value and the destinations.  */
75
 
76
      if (strcmp (op->u.name, "tableswitch") == 0)
77
        {
78
          int lowval;
79
          int highval;
80
          int val;
81
 
82
          addr = (addr + 3) & ~3;
83
          if ((status = get_int (addr, &val, info)))
84
            goto fail;
85
 
86
          fprintf_fn (stream, " default: ");
87
          (*info->print_address_func) (val + insn_start, info);
88
          addr += 4;
89
 
90
          if ((status = get_int (addr, &lowval, info)))
91
            goto fail;
92
          addr += 4;
93
 
94
          if ((status = get_int (addr, &highval, info)))
95
            goto fail;
96
          addr += 4;
97
 
98
          while (lowval <= highval)
99
            {
100
              if ((status = get_int (addr, &val, info)))
101
                goto fail;
102
              fprintf_fn (stream, " %d:[", lowval);
103
              (*info->print_address_func) (val + insn_start, info);
104
              fprintf_fn (stream, " ]");
105
              addr += 4;
106
              lowval++;
107
            }
108
          return addr - insn_start;
109
        }
110
 
111
      /* The lookupswitch instruction is followed by the default
112
         address, element count and pairs of values and
113
         addresses.  */
114
      if (strcmp (op->u.name, "lookupswitch") == 0)
115
        {
116
          int count;
117
          int val;
118
 
119
          addr = (addr + 3) & ~3;
120
          if ((status = get_int (addr, &val, info)))
121
            goto fail;
122
          addr += 4;
123
 
124
          fprintf_fn (stream, " default: ");
125
          (*info->print_address_func) (val + insn_start, info);
126
 
127
          if ((status = get_int (addr, &count, info)))
128
            goto fail;
129
          addr += 4;
130
 
131
          while (count--)
132
            {
133
              if ((status = get_int (addr, &val, info)))
134
                goto fail;
135
              addr += 4;
136
              fprintf_fn (stream, " %d:[", val);
137
 
138
              if ((status = get_int (addr, &val, info)))
139
                goto fail;
140
              addr += 4;
141
 
142
              (*info->print_address_func) (val + insn_start, info);
143
              fprintf_fn (stream, " ]");
144
            }
145
          return addr - insn_start;
146
        }
147
 
148
      for (a = 0; op->arg[a]; a++)
149
        {
150
          unsigned char data[4];
151
          int val = 0;
152
          int i;
153
          int size = ASIZE (op->arg[a]);
154
 
155
          if ((status = info->read_memory_func (addr, data, size, info)))
156
            goto fail;
157
 
158
          val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
159
 
160
          for (i = 0; i < size; i++)
161
            val = (val << 8) | (data[i] & 0xff);
162
 
163
          if (PCREL (op->arg[a]))
164
            (*info->print_address_func) (val + insn_start, info);
165
          else
166
            fprintf_fn (stream, "%s%d", sep, val);
167
 
168
          sep = ",";
169
          addr += size;
170
        }
171
      return op->len;
172
    }
173
 
174
 fail:
175
  info->memory_error_func (status, addr, info);
176
  return -1;
177
}

powered by: WebSVN 2.1.0

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