1 /* pj-dis.c -- Disassemble picoJava instructions.
2    Copyright (C) 1999-2016 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 
27 extern const pj_opc_info_t pj_opc_info[512];
28 
29 static int
get_int(bfd_vma memaddr,int * iptr,struct disassemble_info * info)30 get_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 
43 int
print_insn_pj(bfd_vma addr,struct disassemble_info * info)44 print_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