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
|
/* Print instructions for Tahoe target machines, for GDB.
Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc.
Contributed by the State University of New York at Buffalo, by the
Distributed Computer Systems Lab, Department of Computer Science, 1991.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "symtab.h"
#include "opcode/tahoe.h"
/* Tahoe instructions are never longer than this. */
#define MAXLEN 62
/* Number of elements in the opcode table. */
#define NOPCODES (sizeof votstrs / sizeof votstrs[0])
static unsigned char *print_insn_arg ();
/* Print the Tahoe instruction at address MEMADDR in debugged memory,
on STREAM. Returns length of the instruction, in bytes. */
int
tahoe_print_insn (memaddr, stream)
CORE_ADDR memaddr;
GDB_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_unfiltered (stream, "0%o", buffer[0]);
return 1;
}
fprintf_unfiltered (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_unfiltered ('\t', stream);
while (*d)
{
p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
d += 2;
if (*d)
fprintf_unfiltered (stream, ",");
}
return p - buffer;
}
/*******************************************************************/
static unsigned char *
print_insn_arg (d, p, addr, stream)
char *d;
register char *p;
CORE_ADDR addr;
GDB_FILE *stream;
{
int temp1 = 0;
register int regnum = *p & 0xf;
float floatlitbuf;
if (*d == 'b')
{
if (d[1] == 'b')
fprintf_unfiltered (stream, "0x%x", addr + *p++ + 1);
else
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p + 1);
fprintf_unfiltered (stream, "0x%x", addr + temp1 + 2);
p += 2;
}
}
else
switch ((*p++ >> 4) & 0xf)
{
case 0:
case 1:
case 2:
case 3: /* Literal (short immediate byte) mode */
if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
{
*(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
fprintf_unfiltered (stream, "$%f", floatlitbuf);
}
else
fprintf_unfiltered (stream, "$%d", p[-1] & 0x3f);
break;
case 4: /* Indexed */
p = (char *) print_insn_arg (d, p, addr + 1, stream);
fprintf_unfiltered (stream, "[%s]", reg_names[regnum]);
break;
case 5: /* Register */
fprintf_unfiltered (stream, reg_names[regnum]);
break;
case 7: /* Autodecrement */
fputc_unfiltered ('-', stream);
case 6: /* Register deferred */
fprintf_unfiltered (stream, "(%s)", reg_names[regnum]);
break;
case 9: /* Absolute Address & Autoincrement deferred */
fputc_unfiltered ('*', stream);
if (regnum == PC_REGNUM)
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
fputc_unfiltered ('$', stream);
print_address (temp1, stream);
p += 4;
break;
}
case 8: /*Immediate & Autoincrement SP */
if (regnum == 8) /*88 is Immediate Byte Mode*/
fprintf_unfiltered (stream, "$%d", *p++);
else if (regnum == 9) /*89 is Immediate Word Mode*/
{
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
fprintf_unfiltered (stream, "$%d", temp1);
p += 2;
}
else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/
{
temp1 = *p;
temp1 <<=8;
temp1 |= *(p +1);
temp1 <<=8;
temp1 |= *(p +2);
temp1 <<= 8;
temp1 |= *(p +3);
fprintf_unfiltered (stream, "$%d", temp1);
p += 4;
}
else /*8E is Autoincrement SP Mode*/
fprintf_unfiltered (stream, "(%s)+", reg_names[regnum]);
break;
case 11: /* Register + Byte Displacement Deferred Mode*/
fputc_unfiltered ('*', stream);
case 10: /* Register + Byte Displacement Mode*/
if (regnum == PC_REGNUM)
print_address (addr + *p + 2, stream);
else
fprintf_unfiltered (stream, "%d(%s)", *p, reg_names[regnum]);
p += 1;
break;
case 13: /* Register + Word Displacement Deferred Mode*/
fputc_unfiltered ('*', stream);
case 12: /* Register + Word Displacement Mode*/
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
if (regnum == PC_REGNUM)
print_address (addr + temp1 + 3, stream);
else
fprintf_unfiltered (stream, "%d(%s)", temp1, reg_names[regnum]);
p += 2;
break;
case 15: /* Register + Long Displacement Deferred Mode*/
fputc_unfiltered ('*', stream);
case 14: /* Register + Long Displacement Mode*/
temp1 = *p;
temp1 <<= 8;
temp1 |= *(p +1);
temp1 <<= 8;
temp1 |= *(p +2);
temp1 <<= 8;
temp1 |= *(p +3);
if (regnum == PC_REGNUM)
print_address (addr + temp1 + 5, stream);
else
fprintf_unfiltered (stream, "%d(%s)", temp1, reg_names[regnum]);
p += 4;
}
return (unsigned char *) p;
}
|
