opcodes/pj-dis.c

   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).
   5
   6    This file is part of the GNU opcodes library.
   7
   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.
  12
  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.
  17
  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.  */
  22
  23 #include "sysdep.h"
  24 #include <stdio.h>
  25 #include "opcode/pj.h"
  26 #include "dis-asm.h"
  27
  28 extern const pj_opc_info_t pj_opc_info[512];
  29
  30 static int
  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 = (ival[0] << 24)
  37     | (ival[1] << 16)
  38     | (ival[2] << 8)
  39     | (ival[3] << 0);
  40
  41   return status;
  42 }
  43
  44 int
  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\t", 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       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; 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 = (val << 8) | (data[i] & 0xff);
 163
 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);
 168
 169           sep = ",";
 170           addr += size;
 171         }
 172       return op->len;
 173     }
 174
 175  fail:
 176   info->memory_error_func (status, addr, info);
 177   return -1;
 178 }