opcodes/pj-dis.c

   1 /* pj-dis.c -- Disassemble picoJava instructions.
   2    Copyright 1999, 2000, 2001 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 get_int PARAMS ((bfd_vma, int *, struct disassemble_info *));
  27
  28
  29 static int
  30 get_int (memaddr, iptr, info)
  31      bfd_vma memaddr;
  32      int *iptr;
  33      struct disassemble_info *info;
  34 {
  35   unsigned char ival[4];
  36
  37   int status = info->read_memory_func (memaddr, ival, 4, info);
  38
  39   *iptr = (ival[0] << 24)
  40     | (ival[1] << 16)
  41     | (ival[2] << 8)
  42     | (ival[3] << 0);
  43
  44   return status;
  45 }
  46
  47 int
  48 print_insn_pj (addr, info)
  49      bfd_vma addr;
  50      struct disassemble_info *info;
  51 {
  52   fprintf_ftype fprintf_fn = info->fprintf_func;
  53   void *stream = info->stream;
  54   unsigned char opcode;
  55   int status;
  56
  57   if ((status = info->read_memory_func (addr, &opcode, 1, info)))
  58     goto fail;
  59
  60   if (opcode == 0xff)
  61     {
  62       unsigned char byte_2;
  63       if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
  64         goto fail;
  65       fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
  66       return 2;
  67     }
  68   else
  69     {
  70       char *sep = "\t";
  71       int insn_start = addr;
  72       const pj_opc_info_t *op = &pj_opc_info[opcode];
  73       int a;
  74       addr++;
  75       fprintf_fn (stream, "%s", op->u.name);
  76
  77       /* The tableswitch instruction is followed by the default
  78          address, low value, high value and the destinations.  */
  79
  80       if (strcmp (op->u.name, "tableswitch") == 0)
  81         {
  82           int lowval;
  83           int highval;
  84           int val;
  85
  86           addr = (addr + 3) & ~3;
  87           if ((status = get_int (addr, &val, info)))
  88             goto fail;
  89
  90           fprintf_fn (stream, " default: ");
  91           (*info->print_address_func) (val + insn_start, info);
  92           addr += 4;
  93
  94           if ((status = get_int (addr, &lowval, info)))
  95             goto fail;
  96           addr += 4;
  97
  98           if ((status = get_int (addr, &highval, info)))
  99             goto fail;
 100           addr += 4;
 101
 102           while (lowval <= highval)
 103             {
 104               if ((status = get_int (addr, &val, info)))
 105                 goto fail;
 106               fprintf_fn (stream, " %d:[", lowval);
 107               (*info->print_address_func) (val + insn_start, info);
 108               fprintf_fn (stream, " ]");
 109               addr += 4;
 110               lowval++;
 111             }
 112           return addr - insn_start;
 113         }
 114
 115       /* The lookupswitch instruction is followed by the default
 116          address, element count and pairs of values and
 117          addresses.  */
 118
 119       if (strcmp (op->u.name, "lookupswitch") == 0)
 120         {
 121           int count;
 122           int val;
 123
 124           addr = (addr + 3) & ~3;
 125           if ((status = get_int (addr, &val, info)))
 126             goto fail;
 127           addr += 4;
 128
 129           fprintf_fn (stream, " default: ");
 130           (*info->print_address_func) (val + insn_start, info);
 131
 132           if ((status = get_int (addr, &count, info)))
 133             goto fail;
 134           addr += 4;
 135
 136           while (count--)
 137             {
 138               if ((status = get_int (addr, &val, info)))
 139                 goto fail;
 140               addr += 4;
 141               fprintf_fn (stream, " %d:[", val);
 142
 143               if ((status = get_int (addr, &val, info)))
 144                 goto fail;
 145               addr += 4;
 146
 147               (*info->print_address_func) (val + insn_start, info);
 148               fprintf_fn (stream, " ]");
 149             }
 150           return addr - insn_start;
 151         }
 152       for (a = 0; op->arg[a]; a++)
 153         {
 154           unsigned char data[4];
 155           int val = 0;
 156           int i;
 157           int size = ASIZE (op->arg[a]);
 158
 159           if ((status = info->read_memory_func (addr, data, size, info)))
 160             goto fail;
 161
 162           val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
 163
 164           for (i = 0; i < size; i++)
 165             val = (val << 8) | (data[i] & 0xff);
 166
 167           if (PCREL (op->arg[a]))
 168             (*info->print_address_func) (val + insn_start, info);
 169           else
 170             fprintf_fn (stream, "%s%d", sep, val);
 171
 172           sep = ",";
 173           addr += size;
 174         }
 175       return op->len;
 176     }
 177
 178  fail:
 179   info->memory_error_func (status, addr, info);
 180   return -1;
 181 }