1 /* pj-dis.c -- Disassemble picoJava instructions.
2 Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18
19 #include <stdio.h>
20 #include "sysdep.h"
21 #include "opcode/pj.h"
22 #include "dis-asm.h"
23
24 extern const pj_opc_info_t pj_opc_info[512];
25
26 static int get_int PARAMS ((bfd_vma, int *, struct disassemble_info *));
27
28
29 static int
get_int(memaddr,iptr,info)30 get_int (memaddr, iptr, info)
31 bfd_vma memaddr;
32 int *iptr;
33 struct disassemble_info *info;
34 {
35 unsigned char ival[4];
36
37 int status = info->read_memory_func (memaddr, ival, 4, info);
38
39 *iptr = (ival[0] << 24)
40 | (ival[1] << 16)
41 | (ival[2] << 8)
42 | (ival[3] << 0);
43
44 return status;
45 }
46
47 int
print_insn_pj(addr,info)48 print_insn_pj (addr, info)
49 bfd_vma addr;
50 struct disassemble_info *info;
51 {
52 fprintf_ftype fprintf_fn = info->fprintf_func;
53 void *stream = info->stream;
54 unsigned char opcode;
55 int status;
56
57 if ((status = info->read_memory_func (addr, &opcode, 1, info)))
58 goto fail;
59
60 if (opcode == 0xff)
61 {
62 unsigned char byte_2;
63 if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
64 goto fail;
65 fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
66 return 2;
67 }
68 else
69 {
70 char *sep = "\t";
71 int insn_start = addr;
72 const pj_opc_info_t *op = &pj_opc_info[opcode];
73 int a;
74 addr++;
75 fprintf_fn (stream, "%s", op->u.name);
76
77 /* The tableswitch instruction is followed by the default
78 address, low value, high value and the destinations. */
79
80 if (strcmp (op->u.name, "tableswitch") == 0)
81 {
82 int lowval;
83 int highval;
84 int val;
85
86 addr = (addr + 3) & ~3;
87 if ((status = get_int (addr, &val, info)))
88 goto fail;
89
90 fprintf_fn (stream, " default: ");
91 (*info->print_address_func) (val + insn_start, info);
92 addr += 4;
93
94 if ((status = get_int (addr, &lowval, info)))
95 goto fail;
96 addr += 4;
97
98 if ((status = get_int (addr, &highval, info)))
99 goto fail;
100 addr += 4;
101
102 while (lowval <= highval)
103 {
104 if ((status = get_int (addr, &val, info)))
105 goto fail;
106 fprintf_fn (stream, " %d:[", lowval);
107 (*info->print_address_func) (val + insn_start, info);
108 fprintf_fn (stream, " ]");
109 addr += 4;
110 lowval++;
111 }
112 return addr - insn_start;
113 }
114
115 /* The lookupswitch instruction is followed by the default
116 address, element count and pairs of values and
117 addresses. */
118
119 if (strcmp (op->u.name, "lookupswitch") == 0)
120 {
121 int count;
122 int val;
123
124 addr = (addr + 3) & ~3;
125 if ((status = get_int (addr, &val, info)))
126 goto fail;
127 addr += 4;
128
129 fprintf_fn (stream, " default: ");
130 (*info->print_address_func) (val + insn_start, info);
131
132 if ((status = get_int (addr, &count, info)))
133 goto fail;
134 addr += 4;
135
136 while (count--)
137 {
138 if ((status = get_int (addr, &val, info)))
139 goto fail;
140 addr += 4;
141 fprintf_fn (stream, " %d:[", val);
142
143 if ((status = get_int (addr, &val, info)))
144 goto fail;
145 addr += 4;
146
147 (*info->print_address_func) (val + insn_start, info);
148 fprintf_fn (stream, " ]");
149 }
150 return addr - insn_start;
151 }
152 for (a = 0; op->arg[a]; a++)
153 {
154 unsigned char data[4];
155 int val = 0;
156 int i;
157 int size = ASIZE (op->arg[a]);
158
159 if ((status = info->read_memory_func (addr, data, size, info)))
160 goto fail;
161
162 val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
163
164 for (i = 0; i < size; i++)
165 val = (val << 8) | (data[i] & 0xff);
166
167 if (PCREL (op->arg[a]))
168 (*info->print_address_func) (val + insn_start, info);
169 else
170 fprintf_fn (stream, "%s%d", sep, val);
171
172 sep = ",";
173 addr += size;
174 }
175 return op->len;
176 }
177
178 fail:
179 info->memory_error_func (status, addr, info);
180 return -1;
181 }
182