1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
/* Print VAX instructions for GDB, the GNU debugger.
Copyright 1986, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "defs.h"
#include "symtab.h"
#include "vax-opcode.h"
/* Vax instructions are never longer than this. */
#define MAXLEN 62
/* Number of elements in the opcode table. */
#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
extern char *reg_names[];
static unsigned char *print_insn_arg ();
/* Print the vax instruction at address MEMADDR in debugged memory,
on STREAM. Returns length of the instruction, in bytes. */
int
print_insn (memaddr, stream)
CORE_ADDR memaddr;
FILE *stream;
{
unsigned char buffer[MAXLEN];
register int i;
register unsigned char *p;
register char *d;
read_memory (memaddr, buffer, MAXLEN);
for (i = 0; i < NOPCODES; i++)
if (votstrs[i].detail.code == buffer[0]
|| votstrs[i].detail.code == *(unsigned short *)buffer)
break;
/* Handle undefined instructions. */
if (i == NOPCODES)
{
fprintf (stream, "0%o", buffer[0]);
return 1;
}
fprintf (stream, "%s", votstrs[i].name);
/* Point at first byte of argument data,
and at descriptor for first argument. */
p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
d = votstrs[i].detail.args;
if (*d)
fputc (' ', stream);
while (*d)
{
p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
d += 2;
if (*d)
fprintf (stream, ",");
}
return p - buffer;
}
static unsigned char *
print_insn_arg (d, p, addr, stream)
char *d;
register char *p;
CORE_ADDR addr;
FILE *stream;
{
register int regnum = *p & 0xf;
float floatlitbuf;
if (*d == 'b')
{
if (d[1] == 'b')
fprintf (stream, "0x%x", addr + *p++ + 1);
else
{
fprintf (stream, "0x%x", addr + *(short *)p + 2);
p += 2;
}
}
else
switch ((*p++ >> 4) & 0xf)
{
case 0:
case 1:
case 2:
case 3: /* Literal mode */
if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
{
*(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
fprintf (stream, "$%f", floatlitbuf);
}
else
fprintf (stream, "$%d", p[-1] & 0x3f);
break;
case 4: /* Indexed */
p = (char *) print_insn_arg (d, p, addr + 1, stream);
fprintf (stream, "[%s]", reg_names[regnum]);
break;
case 5: /* Register */
fprintf (stream, reg_names[regnum]);
break;
case 7: /* Autodecrement */
fputc ('-', stream);
case 6: /* Register deferred */
fprintf (stream, "(%s)", reg_names[regnum]);
break;
case 9: /* Autoincrement deferred */
fputc ('@', stream);
if (regnum == PC_REGNUM)
{
fputc ('#', stream);
print_address (*(long *)p, stream);
p += 4;
break;
}
case 8: /* Autoincrement */
if (regnum == PC_REGNUM)
{
fputc ('#', stream);
switch (d[1])
{
case 'b':
fprintf (stream, "%d", *p++);
break;
case 'w':
fprintf (stream, "%d", *(short *)p);
p += 2;
break;
case 'l':
fprintf (stream, "%d", *(long *)p);
p += 4;
break;
case 'q':
fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]);
p += 8;
break;
case 'o':
fprintf (stream, "0x%x%08x%08x%08x",
((long *)p)[3], ((long *)p)[2],
((long *)p)[1], ((long *)p)[0]);
p += 16;
break;
case 'f':
if (INVALID_FLOAT (p, 4))
fprintf (stream, "<<invalid float 0x%x>>", *(int *) p);
else
fprintf (stream, "%f", *(float *) p);
p += 4;
break;
case 'd':
if (INVALID_FLOAT (p, 8))
fprintf (stream, "<<invalid float 0x%x%08x>>",
((long *)p)[1], ((long *)p)[0]);
else
fprintf (stream, "%f", *(double *) p);
p += 8;
break;
case 'g':
fprintf (stream, "g-float");
p += 8;
break;
case 'h':
fprintf (stream, "h-float");
p += 16;
break;
}
}
else
fprintf (stream, "(%s)+", reg_names[regnum]);
break;
case 11: /* Byte displacement deferred */
fputc ('@', stream);
case 10: /* Byte displacement */
if (regnum == PC_REGNUM)
print_address (addr + *p + 2, stream);
else
fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
p += 1;
break;
case 13: /* Word displacement deferred */
fputc ('@', stream);
case 12: /* Word displacement */
if (regnum == PC_REGNUM)
print_address (addr + *(short *)p + 3, stream);
else
fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]);
p += 2;
break;
case 15: /* Long displacement deferred */
fputc ('@', stream);
case 14: /* Long displacement */
if (regnum == PC_REGNUM)
print_address (addr + *(long *)p + 5, stream);
else
fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]);
p += 4;
}
return (unsigned char *) p;
}
|
