1 /* pj-dis.c -- Disassemble picoJava instructions.
2 Copyright (C) 1999-2022 Free Software Foundation, Inc.
3 Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
4
5 This file is part of the GNU opcodes library.
6
7 This library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 It is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include <stdio.h>
24 #include "libiberty.h"
25 #include "opcode/pj.h"
26 #include "disassemble.h"
27
28 extern const pj_opc_info_t pj_opc_info[512];
29
30 static int
get_int(bfd_vma memaddr,int * iptr,struct disassemble_info * info)31 get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
32 {
33 unsigned char ival[4];
34 int status = info->read_memory_func (memaddr, ival, 4, info);
35
36 *iptr = (((unsigned) ival[0] << 24)
37 | (ival[1] << 16)
38 | (ival[2] << 8)
39 | (ival[3] << 0));
40
41 return status;
42 }
43
44 int
print_insn_pj(bfd_vma addr,struct disassemble_info * info)45 print_insn_pj (bfd_vma addr, struct disassemble_info *info)
46 {
47 fprintf_ftype fprintf_fn = info->fprintf_func;
48 void *stream = info->stream;
49 unsigned char opcode;
50 int status;
51
52 if ((status = info->read_memory_func (addr, &opcode, 1, info)))
53 goto fail;
54
55 if (opcode == 0xff)
56 {
57 unsigned char byte_2;
58
59 if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
60 goto fail;
61 fprintf_fn (stream, "%s", pj_opc_info[opcode + byte_2].u.name);
62 return 2;
63 }
64 else
65 {
66 char *sep = "\t";
67 int insn_start = addr;
68 const pj_opc_info_t *op = &pj_opc_info[opcode];
69 unsigned int a;
70
71 addr++;
72 fprintf_fn (stream, "%s", op->u.name);
73
74 /* The tableswitch instruction is followed by the default
75 address, low value, high value and the destinations. */
76
77 if (strcmp (op->u.name, "tableswitch") == 0)
78 {
79 int lowval;
80 int highval;
81 int val;
82
83 addr = (addr + 3) & ~3;
84 if ((status = get_int (addr, &val, info)))
85 goto fail;
86
87 fprintf_fn (stream, " default: ");
88 (*info->print_address_func) (val + insn_start, info);
89 addr += 4;
90
91 if ((status = get_int (addr, &lowval, info)))
92 goto fail;
93 addr += 4;
94
95 if ((status = get_int (addr, &highval, info)))
96 goto fail;
97 addr += 4;
98
99 while (lowval <= highval)
100 {
101 if ((status = get_int (addr, &val, info)))
102 goto fail;
103 fprintf_fn (stream, " %d:[", lowval);
104 (*info->print_address_func) (val + insn_start, info);
105 fprintf_fn (stream, " ]");
106 addr += 4;
107 lowval++;
108 }
109 return addr - insn_start;
110 }
111
112 /* The lookupswitch instruction is followed by the default
113 address, element count and pairs of values and
114 addresses. */
115 if (strcmp (op->u.name, "lookupswitch") == 0)
116 {
117 int count;
118 int val;
119
120 addr = (addr + 3) & ~3;
121 if ((status = get_int (addr, &val, info)))
122 goto fail;
123 addr += 4;
124
125 fprintf_fn (stream, " default: ");
126 (*info->print_address_func) (val + insn_start, info);
127
128 if ((status = get_int (addr, &count, info)))
129 goto fail;
130 addr += 4;
131
132 while (count--)
133 {
134 if ((status = get_int (addr, &val, info)))
135 goto fail;
136 addr += 4;
137 fprintf_fn (stream, " %d:[", val);
138
139 if ((status = get_int (addr, &val, info)))
140 goto fail;
141 addr += 4;
142
143 (*info->print_address_func) (val + insn_start, info);
144 fprintf_fn (stream, " ]");
145 }
146 return addr - insn_start;
147 }
148
149 for (a = 0; a < ARRAY_SIZE (op->arg) && op->arg[a]; a++)
150 {
151 unsigned char data[4];
152 int val = 0;
153 int i;
154 int size = ASIZE (op->arg[a]);
155
156 if ((status = info->read_memory_func (addr, data, size, info)))
157 goto fail;
158
159 val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
160
161 for (i = 0; i < size; i++)
162 val = ((unsigned) val << 8) | (data[i] & 0xff);
163
164 fprintf_fn (stream, "%s", sep);
165 if (PCREL (op->arg[a]))
166 (*info->print_address_func) (val + insn_start, info);
167 else
168 fprintf_fn (stream, "%d", val);
169
170 sep = ",";
171 addr += size;
172 }
173 return op->len;
174 }
175
176 fail:
177 info->memory_error_func (status, addr, info);
178 return -1;
179 }
180