1/* pj-dis.c -- Disassemble picoJava instructions.
2   Copyright (C) 1999-2017 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 "opcode/pj.h"
25#include "dis-asm.h"
26
27extern const pj_opc_info_t pj_opc_info[512];
28
29static int
30get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
31{
32  unsigned char ival[4];
33  int status = info->read_memory_func (memaddr, ival, 4, info);
34
35  *iptr = (ival[0] << 24)
36    | (ival[1] << 16)
37    | (ival[2] << 8)
38    | (ival[3] << 0);
39
40  return status;
41}
42
43int
44print_insn_pj (bfd_vma addr, struct disassemble_info *info)
45{
46  fprintf_ftype fprintf_fn = info->fprintf_func;
47  void *stream = info->stream;
48  unsigned char opcode;
49  int status;
50
51  if ((status = info->read_memory_func (addr, &opcode, 1, info)))
52    goto fail;
53
54  if (opcode == 0xff)
55    {
56      unsigned char byte_2;
57
58      if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
59	goto fail;
60      fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
61      return 2;
62    }
63  else
64    {
65      char *sep = "\t";
66      int insn_start = addr;
67      const pj_opc_info_t *op = &pj_opc_info[opcode];
68      int a;
69
70      addr++;
71      fprintf_fn (stream, "%s", op->u.name);
72
73      /* The tableswitch instruction is followed by the default
74	 address, low value, high value and the destinations.  */
75
76      if (strcmp (op->u.name, "tableswitch") == 0)
77	{
78	  int lowval;
79	  int highval;
80	  int val;
81
82	  addr = (addr + 3) & ~3;
83	  if ((status = get_int (addr, &val, info)))
84	    goto fail;
85
86	  fprintf_fn (stream, " default: ");
87	  (*info->print_address_func) (val + insn_start, info);
88	  addr += 4;
89
90	  if ((status = get_int (addr, &lowval, info)))
91	    goto fail;
92	  addr += 4;
93
94	  if ((status = get_int (addr, &highval, info)))
95	    goto fail;
96	  addr += 4;
97
98	  while (lowval <= highval)
99	    {
100	      if ((status = get_int (addr, &val, info)))
101		goto fail;
102	      fprintf_fn (stream, " %d:[", lowval);
103	      (*info->print_address_func) (val + insn_start, info);
104	      fprintf_fn (stream, " ]");
105	      addr += 4;
106	      lowval++;
107	    }
108	  return addr - insn_start;
109	}
110
111      /* The lookupswitch instruction is followed by the default
112	 address, element count and pairs of values and
113	 addresses.  */
114      if (strcmp (op->u.name, "lookupswitch") == 0)
115	{
116	  int count;
117	  int val;
118
119	  addr = (addr + 3) & ~3;
120	  if ((status = get_int (addr, &val, info)))
121	    goto fail;
122	  addr += 4;
123
124	  fprintf_fn (stream, " default: ");
125	  (*info->print_address_func) (val + insn_start, info);
126
127	  if ((status = get_int (addr, &count, info)))
128	    goto fail;
129	  addr += 4;
130
131	  while (count--)
132	    {
133	      if ((status = get_int (addr, &val, info)))
134		goto fail;
135	      addr += 4;
136	      fprintf_fn (stream, " %d:[", val);
137
138	      if ((status = get_int (addr, &val, info)))
139		goto fail;
140	      addr += 4;
141
142	      (*info->print_address_func) (val + insn_start, info);
143	      fprintf_fn (stream, " ]");
144	    }
145	  return addr - insn_start;
146	}
147
148      for (a = 0; op->arg[a]; a++)
149	{
150	  unsigned char data[4];
151	  int val = 0;
152	  int i;
153	  int size = ASIZE (op->arg[a]);
154
155	  if ((status = info->read_memory_func (addr, data, size, info)))
156	    goto fail;
157
158	  val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
159
160	  for (i = 0; i < size; i++)
161	    val = (val << 8) | (data[i] & 0xff);
162
163	  if (PCREL (op->arg[a]))
164	    (*info->print_address_func) (val + insn_start, info);
165	  else
166	    fprintf_fn (stream, "%s%d", sep, val);
167
168	  sep = ",";
169	  addr += size;
170	}
171      return op->len;
172    }
173
174 fail:
175  info->memory_error_func (status, addr, info);
176  return -1;
177}
178