opcodes/pj-dis.c

   1 /* pj-dis.c -- Disassemble picoJava instructions.
   2    Copyright 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com).
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 #include <stdio.h>
  20 #include "sysdep.h"
  21 #include "opcode/pj.h"
  22 #include "dis-asm.h"
  23
  24 extern const pj_opc_info_t pj_opc_info[512];
  25
  26 static int
  27 get_int (memaddr, iptr, info)
  28      bfd_vma memaddr;
  29      int *iptr;
  30      struct disassemble_info *info;
  31 {
  32   unsigned char ival[4];
  33
  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 (addr, info)
  46      bfd_vma addr;
  47      struct disassemble_info *info;
  48 {
  49   fprintf_ftype fprintf_fn = info->fprintf_func;
  50   void *stream = info->stream;
  51   unsigned char opcode;
  52   int status;
  53
  54   if ((status = info->read_memory_func (addr, &opcode, 1, info)))
  55     goto fail;
  56
  57   if (opcode == 0xff)
  58     {
  59       unsigned char byte_2;
  60       if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
  61         goto fail;
  62       fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].name);
  63       return 2;
  64     }
  65   else
  66     {
  67       char *sep = "\t";
  68       int insn_start = addr;
  69       const pj_opc_info_t *op = &pj_opc_info[opcode];
  70       int a;
  71       addr++;
  72       fprintf_fn (stream, "%s", op->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->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
 116       if (strcmp (op->name, "lookupswitch") == 0)
 117         {
 118           int count;
 119           int val;
 120
 121           addr = (addr + 3) & ~3;
 122           if ((status = get_int (addr, &val, info)))
 123             goto fail;
 124           addr += 4;
 125
 126           fprintf_fn (stream, " default: ");
 127           (*info->print_address_func) (val + insn_start, info);
 128
 129           if ((status = get_int (addr, &count, info)))
 130             goto fail;
 131           addr += 4;
 132
 133           while (count--)
 134             {
 135               if ((status = get_int (addr, &val, info)))
 136                 goto fail;
 137               addr += 4;
 138               fprintf_fn (stream, " %d:[", val);
 139
 140               if ((status = get_int (addr, &val, info)))
 141                 goto fail;
 142               addr += 4;
 143
 144               (*info->print_address_func) (val + insn_start, info);
 145               fprintf_fn (stream, " ]");
 146             }
 147           return addr - insn_start;
 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 }