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
|
/* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions
Copyright 1994, 2000 Free Software Foundation, Inc.
PowerPC version written by Ian Lance Taylor, Cygnus Support
Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org>
This file is part of GDB, GAS, and the GNU binutils.
GDB, GAS, and the GNU binutils are free software; you can redistribute
them and/or modify them under the terms of the GNU General Public
License as published by the Free Software Foundation; either version
2, or (at your option) any later version.
GDB, GAS, and the GNU binutils are distributed in the hope that they
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <stdio.h>
#include "sysdep.h"
#include "dis-asm.h"
#include "opcode/i370.h"
/* This file provides several disassembler functions, all of which use
the disassembler interface defined in dis-asm.h.
*/
int
print_insn_i370 (memaddr, info)
bfd_vma memaddr;
struct disassemble_info *info;
{
bfd_byte buffer[8];
int status;
i370_insn_t insn;
const struct i370_opcode *opcode;
const struct i370_opcode *opcode_end;
status = (*info->read_memory_func) (memaddr, buffer, 6, info);
if (status != 0)
{
(*info->memory_error_func) (status, memaddr, info);
return -1;
}
/* Cast the bytes into the insn (in a host-endian indep way) */
insn.i[0] = (buffer[0] << 24) & 0xff000000;
insn.i[0] |= (buffer[1] << 16) & 0xff0000;
insn.i[0] |= (buffer[2] << 8) & 0xff00;
insn.i[0] |= buffer[3] & 0xff;
insn.i[1] = (buffer[4] << 24) & 0xff000000;
insn.i[1] |= (buffer[5] << 16) & 0xff0000;
/* Find the first match in the opcode table. We could speed this up
a bit by doing a binary search on the major opcode. */
opcode_end = i370_opcodes + i370_num_opcodes;
for (opcode = i370_opcodes; opcode < opcode_end; opcode++)
{
const unsigned char *opindex;
const struct i370_operand *operand;
i370_insn_t masked;
int invalid;
/* Mask off operands, and look for a match ... */
masked = insn;
if (2 == opcode->len)
{
masked.i[0] >>= 16;
masked.i[0] &= 0xffff;
}
masked.i[0] &= opcode->mask.i[0];
if (masked.i[0] != opcode->opcode.i[0]) continue;
if (6 == opcode->len)
{
masked.i[1] &= opcode->mask.i[1];
if (masked.i[1] != opcode->opcode.i[1]) continue;
}
/* Found a match. adjust a tad */
if (2 == opcode->len)
{
insn.i[0] >>= 16;
insn.i[0] &= 0xffff;
}
/* Make two passes over the operands. First see if any of them
have extraction functions, and, if they do, make sure the
instruction is valid. */
invalid = 0;
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
operand = i370_operands + *opindex;
if (operand->extract)
(*operand->extract) (insn, &invalid);
}
if (invalid) continue;
/* The instruction is valid. */
(*info->fprintf_func) (info->stream, "%s", opcode->name);
if (opcode->operands[0] != 0)
(*info->fprintf_func) (info->stream, "\t");
/* Now extract and print the operands. */
for (opindex = opcode->operands; *opindex != 0; opindex++)
{
long value;
operand = i370_operands + *opindex;
/* Extract the value from the instruction. */
if (operand->extract)
value = (*operand->extract) (insn, (int *) NULL);
else
{
value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1);
}
/* Print the operand as directed by the flags. */
if ((operand->flags & I370_OPERAND_OPTIONAL) != 0)
{
if (value)
(*info->fprintf_func) (info->stream, "(r%ld)", value);
}
else if ((operand->flags & I370_OPERAND_SBASE) != 0)
{
(*info->fprintf_func) (info->stream, "(r%ld)", value);
}
else if ((operand->flags & I370_OPERAND_INDEX) != 0)
{
if (value)
(*info->fprintf_func) (info->stream, "(r%ld,", value);
else
(*info->fprintf_func) (info->stream, "(,");
}
else if ((operand->flags & I370_OPERAND_LENGTH) != 0)
{
(*info->fprintf_func) (info->stream, "(%ld,", value);
}
else if ((operand->flags & I370_OPERAND_BASE) != 0)
(*info->fprintf_func) (info->stream, "r%ld)", value);
else if ((operand->flags & I370_OPERAND_GPR) != 0)
(*info->fprintf_func) (info->stream, "r%ld,", value);
else if ((operand->flags & I370_OPERAND_FPR) != 0)
(*info->fprintf_func) (info->stream, "f%ld,", value);
else if ((operand->flags & I370_OPERAND_RELATIVE) != 0)
(*info->fprintf_func) (info->stream, "%ld", value);
else
(*info->fprintf_func) (info->stream, " %ld, ", value);
}
return opcode->len;
}
/* We could not find a match. */
(*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]);
return 2;
}
|
