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
|
/* xtensa-dis.c. Disassembly functions for Xtensa.
Copyright (C) 2003-2014 Free Software Foundation, Inc.
Contributed by Bob Wilson at Tensilica, Inc. (bwilson@tensilica.com)
This file is part of the GNU opcodes library.
This library 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 3, or (at your option)
any later version.
It 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 file; see the file COPYING. If not, write to the
Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include "xtensa-isa.h"
#include "ansidecl.h"
#include "libiberty.h"
#include "dis-asm.h"
#include <setjmp.h>
extern xtensa_isa xtensa_default_isa;
#ifndef MAX
#define MAX(a,b) (a > b ? a : b)
#endif
int show_raw_fields;
struct dis_private
{
bfd_byte *byte_buf;
OPCODES_SIGJMP_BUF bailout;
};
static int
fetch_data (struct disassemble_info *info, bfd_vma memaddr)
{
int length, status = 0;
struct dis_private *priv = (struct dis_private *) info->private_data;
int insn_size = xtensa_isa_maxlength (xtensa_default_isa);
/* Read the maximum instruction size, padding with zeros if we go past
the end of the text section. This code will automatically adjust
length when we hit the end of the buffer. */
memset (priv->byte_buf, 0, insn_size);
for (length = insn_size; length > 0; length--)
{
status = (*info->read_memory_func) (memaddr, priv->byte_buf, length,
info);
if (status == 0)
return length;
}
(*info->memory_error_func) (status, memaddr, info);
OPCODES_SIGLONGJMP (priv->bailout, 1);
/*NOTREACHED*/
}
static void
print_xtensa_operand (bfd_vma memaddr,
struct disassemble_info *info,
xtensa_opcode opc,
int opnd,
unsigned operand_val)
{
xtensa_isa isa = xtensa_default_isa;
int signed_operand_val;
if (show_raw_fields)
{
if (operand_val < 0xa)
(*info->fprintf_func) (info->stream, "%u", operand_val);
else
(*info->fprintf_func) (info->stream, "0x%x", operand_val);
return;
}
(void) xtensa_operand_decode (isa, opc, opnd, &operand_val);
signed_operand_val = (int) operand_val;
if (xtensa_operand_is_register (isa, opc, opnd) == 0)
{
if (xtensa_operand_is_PCrelative (isa, opc, opnd) == 1)
{
(void) xtensa_operand_undo_reloc (isa, opc, opnd,
&operand_val, memaddr);
info->target = operand_val;
(*info->print_address_func) (info->target, info);
}
else
{
if ((signed_operand_val > -256) && (signed_operand_val < 256))
(*info->fprintf_func) (info->stream, "%d", signed_operand_val);
else
(*info->fprintf_func) (info->stream, "0x%x", signed_operand_val);
}
}
else
{
int i = 1;
xtensa_regfile opnd_rf = xtensa_operand_regfile (isa, opc, opnd);
(*info->fprintf_func) (info->stream, "%s%u",
xtensa_regfile_shortname (isa, opnd_rf),
operand_val);
while (i < xtensa_operand_num_regs (isa, opc, opnd))
{
operand_val++;
(*info->fprintf_func) (info->stream, ":%s%u",
xtensa_regfile_shortname (isa, opnd_rf),
operand_val);
i++;
}
}
}
/* Print the Xtensa instruction at address MEMADDR on info->stream.
Returns length of the instruction in bytes. */
int
print_insn_xtensa (bfd_vma memaddr, struct disassemble_info *info)
{
unsigned operand_val;
int bytes_fetched, size, maxsize, i, n, noperands, nslots;
xtensa_isa isa;
xtensa_opcode opc;
xtensa_format fmt;
struct dis_private priv;
static bfd_byte *byte_buf = NULL;
static xtensa_insnbuf insn_buffer = NULL;
static xtensa_insnbuf slot_buffer = NULL;
int first, first_slot, valid_insn;
if (!xtensa_default_isa)
xtensa_default_isa = xtensa_isa_init (0, 0);
info->target = 0;
maxsize = xtensa_isa_maxlength (xtensa_default_isa);
/* Set bytes_per_line to control the amount of whitespace between the hex
values and the opcode. For Xtensa, we always print one "chunk" and we
vary bytes_per_chunk to determine how many bytes to print. (objdump
would apparently prefer that we set bytes_per_chunk to 1 and vary
bytes_per_line but that makes it hard to fit 64-bit instructions on
an 80-column screen.) The value of bytes_per_line here is not exactly
right, because objdump adds an extra space for each chunk so that the
amount of whitespace depends on the chunk size. Oh well, it's good
enough.... Note that we set the minimum size to 4 to accomodate
literal pools. */
info->bytes_per_line = MAX (maxsize, 4);
/* Allocate buffers the first time through. */
if (!insn_buffer)
{
insn_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
slot_buffer = xtensa_insnbuf_alloc (xtensa_default_isa);
byte_buf = (bfd_byte *) xmalloc (MAX (maxsize, 4));
}
priv.byte_buf = byte_buf;
info->private_data = (void *) &priv;
if (OPCODES_SIGSETJMP (priv.bailout) != 0)
/* Error return. */
return -1;
/* Don't set "isa" before the setjmp to keep the compiler from griping. */
isa = xtensa_default_isa;
size = 0;
nslots = 0;
/* Fetch the maximum size instruction. */
bytes_fetched = fetch_data (info, memaddr);
/* Copy the bytes into the decode buffer. */
memset (insn_buffer, 0, (xtensa_insnbuf_size (isa) *
sizeof (xtensa_insnbuf_word)));
xtensa_insnbuf_from_chars (isa, insn_buffer, priv.byte_buf, bytes_fetched);
fmt = xtensa_format_decode (isa, insn_buffer);
if (fmt == XTENSA_UNDEFINED
|| ((size = xtensa_format_length (isa, fmt)) > bytes_fetched))
valid_insn = 0;
else
{
/* Make sure all the opcodes are valid. */
valid_insn = 1;
nslots = xtensa_format_num_slots (isa, fmt);
for (n = 0; n < nslots; n++)
{
xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
if (xtensa_opcode_decode (isa, fmt, n, slot_buffer)
== XTENSA_UNDEFINED)
{
valid_insn = 0;
break;
}
}
}
if (!valid_insn)
{
(*info->fprintf_func) (info->stream, ".byte %#02x", priv.byte_buf[0]);
return 1;
}
if (nslots > 1)
(*info->fprintf_func) (info->stream, "{ ");
first_slot = 1;
for (n = 0; n < nslots; n++)
{
if (first_slot)
first_slot = 0;
else
(*info->fprintf_func) (info->stream, "; ");
xtensa_format_get_slot (isa, fmt, n, insn_buffer, slot_buffer);
opc = xtensa_opcode_decode (isa, fmt, n, slot_buffer);
(*info->fprintf_func) (info->stream, "%s",
xtensa_opcode_name (isa, opc));
/* Print the operands (if any). */
noperands = xtensa_opcode_num_operands (isa, opc);
first = 1;
for (i = 0; i < noperands; i++)
{
if (xtensa_operand_is_visible (isa, opc, i) == 0)
continue;
if (first)
{
(*info->fprintf_func) (info->stream, "\t");
first = 0;
}
else
(*info->fprintf_func) (info->stream, ", ");
(void) xtensa_operand_get_field (isa, opc, i, fmt, n,
slot_buffer, &operand_val);
print_xtensa_operand (memaddr, info, opc, i, operand_val);
}
}
if (nslots > 1)
(*info->fprintf_func) (info->stream, " }");
info->bytes_per_chunk = size;
info->display_endian = info->endian;
return size;
}
|
