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
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/* Disassembler for the i860.
Copyright 2000 Free Software Foundation, Inc.
Contributed by Jason Eckhardt <jle@cygnus.com>.
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 "dis-asm.h"
#include "opcode/i860.h"
/* Later we should probably choose the prefix based on which OS flavor. */
#define I860_REG_PREFIX "%"
/* Integer register names (encoded as 0..31 in the instruction). */
static const char *const grnames[] =
{"r0", "r1", "sp", "fp", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31"};
/* FP register names (encoded as 0..31 in the instruction). */
static const char *const frnames[] =
{"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31"};
/* Control/status register names (encoded as 0..5 in the instruction). */
static const char *const crnames[] =
{"fir", "psr", "dirbase", "db", "fsr", "epsr", "", ""};
/* Prototypes. */
static int sign_ext PARAMS((unsigned int, int));
static void print_br_address PARAMS((disassemble_info *, bfd_vma, long));
/* True if opcode is xor, xorh, and, andh, or, orh, andnot, andnoth. */
#define BITWISE_OP(op) ((op) == 0x30 || (op) == 0x31 \
|| (op) == 0x34 || (op) == 0x35 \
|| (op) == 0x38 || (op) == 0x39 \
|| (op) == 0x3c || (op) == 0x3d \
|| (op) == 0x33 || (op) == 0x37 \
|| (op) == 0x3b || (op) == 0x3f)
/* Sign extend N-bit number. */
static int
sign_ext (x, n)
unsigned int x;
int n;
{
int t;
t = x >> (n - 1);
t = ((-t) << n) | x;
return t;
}
/* Print a PC-relative branch offset. VAL is the sign extended value
from the branch instruction. */
static void
print_br_address (info, memaddr, val)
disassemble_info *info;
bfd_vma memaddr;
long val;
{
long adj = (long)memaddr + 4 + (val << 2);
(*info->fprintf_func) (info->stream, "0x%08x", adj);
/* Attempt to obtain a symbol for the target address. */
if (info->print_address_func && adj != 0)
{
(*info->fprintf_func) (info->stream, "\t// ");
(*info->print_address_func) (adj, info);
}
}
/* Print one instruction. */
int
print_insn_i860 (memaddr, info)
bfd_vma memaddr;
disassemble_info *info;
{
bfd_byte buff[4];
unsigned int insn, i;
int status;
const struct i860_opcode *opcode = 0;
status = (*info->read_memory_func) (memaddr, buff, sizeof (buff), info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
/* Note that i860 instructions are always accessed as little endian
data, regardless of the endian mode of the i860. */
insn = bfd_getl32 (buff);
status = 0;
i = 0;
while (i860_opcodes[i].name != NULL)
{
opcode = &i860_opcodes[i];
if ((insn & opcode->match) == opcode->match
&& (insn & opcode->lose) == 0)
{
status = 1;
break;
}
++i;
}
if (status == 0)
{
/* Instruction not in opcode table. */
(*info->fprintf_func) (info->stream, ".long %#08x", insn);
}
else
{
const char *s;
int val;
/* If this a flop and its dual bit is set, prefix with 'd.'. */
if ((insn & 0xfc000000) == 0x48000000 && (insn & 0x200))
(*info->fprintf_func) (info->stream, "d.%s\t", opcode->name);
else
(*info->fprintf_func) (info->stream, "%s\t", opcode->name);
for (s = opcode->args; *s; s++)
{
switch (*s)
{
/* Integer register (src1). */
case '1':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 11) & 0x1f]);
break;
/* Integer register (src2). */
case '2':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 21) & 0x1f]);
break;
/* Integer destination register. */
case 'd':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
grnames[(insn >> 16) & 0x1f]);
break;
/* Floating-point register (src1). */
case 'e':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 11) & 0x1f]);
break;
/* Floating-point register (src2). */
case 'f':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 21) & 0x1f]);
break;
/* Floating-point destination register. */
case 'g':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
frnames[(insn >> 16) & 0x1f]);
break;
/* Control register. */
case 'c':
(*info->fprintf_func) (info->stream, "%s%s", I860_REG_PREFIX,
crnames[(insn >> 21) & 0x7]);
break;
/* 16-bit immediate (sign extend, except for bitwise ops). */
case 'i':
if (BITWISE_OP ((insn & 0xfc000000) >> 26))
(*info->fprintf_func) (info->stream, "0x%04x",
(unsigned int) (insn & 0xffff));
else
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xffff), 16));
break;
/* 16-bit immediate, aligned (2^0, ld.b). */
case 'I':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xffff), 16));
break;
/* 16-bit immediate, aligned (2^1, ld.s). */
case 'J':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfffe), 16));
break;
/* 16-bit immediate, aligned (2^2, ld.l, {p}fld.l, fst.l). */
case 'K':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfffc), 16));
break;
/* 16-bit immediate, aligned (2^3, {p}fld.d, fst.d). */
case 'L':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfff8), 16));
break;
/* 16-bit immediate, aligned (2^4, {p}fld.q, fst.q). */
case 'M':
(*info->fprintf_func) (info->stream, "%d",
sign_ext ((insn & 0xfff0), 16));
break;
/* 5-bit immediate (zero extend). */
case '5':
(*info->fprintf_func) (info->stream, "%d",
((insn >> 11) & 0x1f));
break;
/* Split 16 bit immediate (20..16:10..0). */
case 's':
val = ((insn >> 5) & 0xf800) | (insn & 0x07ff);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^0, st.b). */
case 'S':
val = ((insn >> 5) & 0xf800) | (insn & 0x07ff);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^1, st.s). */
case 'T':
val = ((insn >> 5) & 0xf800) | (insn & 0x07fe);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* Split 16 bit immediate, aligned. (2^2, st.l). */
case 'U':
val = ((insn >> 5) & 0xf800) | (insn & 0x07fc);
(*info->fprintf_func) (info->stream, "%d",
sign_ext (val, 16));
break;
/* 26-bit PC relative immediate (lbroff). */
case 'l':
val = sign_ext ((insn & 0x03ffffff), 26);
print_br_address (info, memaddr, val);
break;
/* 16-bit PC relative immediate (sbroff). */
case 'r':
val = sign_ext ((((insn >> 5) & 0xf800) | (insn & 0x07ff)), 16);
print_br_address (info, memaddr, val);
break;
default:
(*info->fprintf_func) (info->stream, "%c", *s);
break;
}
}
}
return sizeof (insn);
}
|
