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
|
/* s390-dis.c -- Disassemble S390 instructions
Copyright 2000, 2001 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of GDB, GAS and the GNU binutils.
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 <stdio.h>
#include "ansidecl.h"
#include "sysdep.h"
#include "dis-asm.h"
#include "opcode/s390.h"
static int init_flag = 0;
static int opc_index[256];
static int current_arch_mask = 0;
/* Set up index table for first opcode byte */
static void
init_disasm(info)
struct disassemble_info *info ATTRIBUTE_UNUSED;
{
const struct s390_opcode *opcode;
const struct s390_opcode *opcode_end;
memset(opc_index, 0, sizeof(opc_index));
opcode_end = s390_opcodes + s390_num_opcodes;
for (opcode = s390_opcodes; opcode < opcode_end; opcode++) {
opc_index[(int) opcode->opcode[0]] = opcode - s390_opcodes;
while ((opcode < opcode_end) &&
(opcode[1].opcode[0] == opcode->opcode[0]))
opcode++;
}
switch (info->mach) {
case bfd_mach_s390_esa:
current_arch_mask = 1 << S390_OPCODE_ESA;
break;
case bfd_mach_s390_esame:
current_arch_mask = 1 << S390_OPCODE_ESAME;
break;
default:
abort();
}
init_flag = 1;
}
/* Extracts an operand value from an instruction. */
static inline unsigned int
s390_extract_operand (insn, operand)
unsigned char *insn;
const struct s390_operand *operand;
{
unsigned int val;
int bits;
/* extract fragments of the operand byte for byte */
insn += operand->shift/8;
bits = (operand->shift & 7) + operand->bits;
val = 0;
do {
val <<= 8;
val |= (unsigned int) *insn++;
bits -= 8;
} while (bits > 0);
val >>= -bits;
val &= ((1U << (operand->bits-1))<<1) - 1;
/* sign extend value if the operand is signed or pc relative */
if ((operand->flags & (S390_OPERAND_SIGNED|S390_OPERAND_PCREL)) &&
(val & (1U << (operand->bits-1))))
val |= (-1U << (operand->bits-1))<<1;
/* double value if the operand is pc relative */
if (operand->flags & S390_OPERAND_PCREL)
val <<= 1;
/* length x in an instructions has real length x+1 */
if (operand->flags & S390_OPERAND_LENGTH)
val++;
return val;
}
/* Print a S390 instruction. */
int
print_insn_s390 (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
bfd_byte buffer[6];
const struct s390_opcode *opcode;
const struct s390_opcode *opcode_end;
unsigned int value;
int status, opsize, bufsize;
char separator;
if (init_flag == 0)
init_disasm(info);
/* The output looks better if we put 6 bytes on a line. */
info->bytes_per_line = 6;
/* Every S390 instruction is max 6 bytes long. */
memset(buffer, 0, 6);
status = (*info->read_memory_func) (memaddr, buffer, 6, info);
if (status != 0) {
for (bufsize = 0; bufsize < 6; bufsize++)
if ((*info->read_memory_func) (memaddr, buffer, bufsize+1, info) != 0)
break;
if (bufsize <= 0) {
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
/* Opsize calculation looks strange but it works
00xxxxxx -> 2 bytes, 01xxxxxx/10xxxxxx -> 4 bytes,
11xxxxxx -> 6 bytes. */
opsize = ((((buffer[0]>>6)+1)>>1)+1)<<1;
status = opsize > bufsize;
} else {
bufsize = 6;
opsize = ((((buffer[0]>>6)+1)>>1)+1)<<1;
}
if (status == 0) {
/* Find the first match in the opcode table. */
opcode_end = s390_opcodes + s390_num_opcodes;
for (opcode = s390_opcodes + opc_index[(int) buffer[0]];
(opcode < opcode_end) && (buffer[0] == opcode->opcode[0]);
opcode++) {
const struct s390_operand *operand;
const unsigned char *opindex;
/* check architecture */
if (!(opcode->architecture & current_arch_mask))
continue;
/* check signature of the opcode */
if ((buffer[1] & opcode->mask[1]) != opcode->opcode[1] ||
(buffer[2] & opcode->mask[2]) != opcode->opcode[2] ||
(buffer[3] & opcode->mask[3]) != opcode->opcode[3] ||
(buffer[4] & opcode->mask[4]) != opcode->opcode[4] ||
(buffer[5] & opcode->mask[5]) != opcode->opcode[5])
continue;
/* the instruction is valid */
if (opcode->operands[0] != 0)
(*info->fprintf_func) (info->stream, "%s\t", opcode->name);
else
(*info->fprintf_func) (info->stream, "%s", opcode->name);
/* Extract the operands. */
separator = 0;
for (opindex = opcode->operands; *opindex != 0; opindex++) {
unsigned int value;
operand = s390_operands + *opindex;
value = s390_extract_operand(buffer, operand);
if ((operand->flags & S390_OPERAND_INDEX) && value == 0)
continue;
if ((operand->flags & S390_OPERAND_BASE) &&
value == 0 && separator == '(') {
separator = ',';
continue;
}
if (separator)
(*info->fprintf_func) (info->stream, "%c", separator);
if (operand->flags & S390_OPERAND_GPR)
(*info->fprintf_func) (info->stream, "%%r%i", value);
else if (operand->flags & S390_OPERAND_FPR)
(*info->fprintf_func) (info->stream, "%%f%i", value);
else if (operand->flags & S390_OPERAND_AR)
(*info->fprintf_func) (info->stream, "%%a%i", value);
else if (operand->flags & S390_OPERAND_CR)
(*info->fprintf_func) (info->stream, "%%c%i", value);
else if (operand->flags & S390_OPERAND_PCREL)
(*info->print_address_func) (memaddr + (int) value, info);
else if (operand->flags & S390_OPERAND_SIGNED)
(*info->fprintf_func) (info->stream, "%i", (int) value);
else
(*info->fprintf_func) (info->stream, "%i", value);
if (operand->flags & S390_OPERAND_DISP) {
separator = '(';
} else if (operand->flags & S390_OPERAND_BASE) {
(*info->fprintf_func) (info->stream, ")");
separator = ',';
} else
separator = ',';
}
/* found instruction, printed it, return its size */
return opsize;
}
/* no matching instruction found, fall through to hex print */
}
if (bufsize >= 4) {
value = (unsigned int) buffer[0];
value = (value << 8) + (unsigned int) buffer[1];
value = (value << 8) + (unsigned int) buffer[2];
value = (value << 8) + (unsigned int) buffer[3];
(*info->fprintf_func) (info->stream,".long\t0x%08x", value);
return 4;
} else if (bufsize >= 2) {
value = (unsigned int) buffer[0];
value = (value << 8) + (unsigned int) buffer[1];
(*info->fprintf_func) (info->stream,".short\t0x%04x", value);
return 2;
} else {
value = (unsigned int) buffer[0];
(*info->fprintf_func) (info->stream,".byte\t0x%02x", value);
return 1;
}
}
|
