opcodes/
[binutils-gdb.git] / opcodes / pj-dis.c
blob7bd868eee73b02e5bf0d140b0de65bc8e047a266
1 /* pj-dis.c -- Disassemble picoJava instructions.
2 Copyright 1999, 2000, 2001, 2002, 2005, 2007, 2012
3 Free Software Foundation, Inc.
4 Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
6 This file is part of the GNU opcodes library.
8 This library is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
11 any later version.
13 It is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
23 #include "sysdep.h"
24 #include <stdio.h>
25 #include "opcode/pj.h"
26 #include "dis-asm.h"
28 extern const pj_opc_info_t pj_opc_info[512];
30 static int
31 get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
33 unsigned char ival[4];
34 int status = info->read_memory_func (memaddr, ival, 4, info);
36 *iptr = (ival[0] << 24)
37 | (ival[1] << 16)
38 | (ival[2] << 8)
39 | (ival[3] << 0);
41 return status;
44 int
45 print_insn_pj (bfd_vma addr, struct disassemble_info *info)
47 fprintf_ftype fprintf_fn = info->fprintf_func;
48 void *stream = info->stream;
49 unsigned char opcode;
50 int status;
52 if ((status = info->read_memory_func (addr, &opcode, 1, info)))
53 goto fail;
55 if (opcode == 0xff)
57 unsigned char byte_2;
59 if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
60 goto fail;
61 fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
62 return 2;
64 else
66 char *sep = "\t";
67 int insn_start = addr;
68 const pj_opc_info_t *op = &pj_opc_info[opcode];
69 int a;
71 addr++;
72 fprintf_fn (stream, "%s", op->u.name);
74 /* The tableswitch instruction is followed by the default
75 address, low value, high value and the destinations. */
77 if (strcmp (op->u.name, "tableswitch") == 0)
79 int lowval;
80 int highval;
81 int val;
83 addr = (addr + 3) & ~3;
84 if ((status = get_int (addr, &val, info)))
85 goto fail;
87 fprintf_fn (stream, " default: ");
88 (*info->print_address_func) (val + insn_start, info);
89 addr += 4;
91 if ((status = get_int (addr, &lowval, info)))
92 goto fail;
93 addr += 4;
95 if ((status = get_int (addr, &highval, info)))
96 goto fail;
97 addr += 4;
99 while (lowval <= highval)
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++;
109 return addr - insn_start;
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)
117 int count;
118 int val;
120 addr = (addr + 3) & ~3;
121 if ((status = get_int (addr, &val, info)))
122 goto fail;
123 addr += 4;
125 fprintf_fn (stream, " default: ");
126 (*info->print_address_func) (val + insn_start, info);
128 if ((status = get_int (addr, &count, info)))
129 goto fail;
130 addr += 4;
132 while (count--)
134 if ((status = get_int (addr, &val, info)))
135 goto fail;
136 addr += 4;
137 fprintf_fn (stream, " %d:[", val);
139 if ((status = get_int (addr, &val, info)))
140 goto fail;
141 addr += 4;
143 (*info->print_address_func) (val + insn_start, info);
144 fprintf_fn (stream, " ]");
146 return addr - insn_start;
149 for (a = 0; op->arg[a]; a++)
151 unsigned char data[4];
152 int val = 0;
153 int i;
154 int size = ASIZE (op->arg[a]);
156 if ((status = info->read_memory_func (addr, data, size, info)))
157 goto fail;
159 val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
161 for (i = 0; i < size; i++)
162 val = (val << 8) | (data[i] & 0xff);
164 if (PCREL (op->arg[a]))
165 (*info->print_address_func) (val + insn_start, info);
166 else
167 fprintf_fn (stream, "%s%d", sep, val);
169 sep = ",";
170 addr += size;
172 return op->len;
175 fail:
176 info->memory_error_func (status, addr, info);
177 return -1;