opcodes/pj-dis.c

   1 /* pj-dis.c -- Disassemble picoJava instructions.
   2    Copyright 1999, 2000, 2001, 2002, 2005, 2007 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 <stdio.h>
  23 #include "sysdep.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
  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
  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 }