gnu/dist/gdb6/opcodes/pj-dis.c

   1 /* pj-dis.c -- Disassemble picoJava instructions.
   2    Copyright 1999, 2000, 2001, 2002, 2005 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., 51 Franklin Street - Fifth Floor, Boston,
  18    MA 02110-1301, USA.  */
  19
  20 #include <stdio.h>
  21 #include "sysdep.h"
  22 #include "opcode/pj.h"
  23 #include "dis-asm.h"
  24
  25 extern const pj_opc_info_t pj_opc_info[512];
  26
  27 static int
  28 get_int (bfd_vma memaddr, int *iptr, struct disassemble_info *info)
  29 {
  30   unsigned char ival[4];
  31   int status = info->read_memory_func (memaddr, ival, 4, info);
  32
  33   *iptr = (ival[0] << 24)
  34     | (ival[1] << 16)
  35     | (ival[2] << 8)
  36     | (ival[3] << 0);
  37
  38   return status;
  39 }
  40
  41 int
  42 print_insn_pj (bfd_vma addr, struct disassemble_info *info)
  43 {
  44   fprintf_ftype fprintf_fn = info->fprintf_func;
  45   void *stream = info->stream;
  46   unsigned char opcode;
  47   int status;
  48
  49   if ((status = info->read_memory_func (addr, &opcode, 1, info)))
  50     goto fail;
  51
  52   if (opcode == 0xff)
  53     {
  54       unsigned char byte_2;
  55
  56       if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info)))
  57         goto fail;
  58       fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].u.name);
  59       return 2;
  60     }
  61   else
  62     {
  63       char *sep = "\t";
  64       int insn_start = addr;
  65       const pj_opc_info_t *op = &pj_opc_info[opcode];
  66       int a;
  67
  68       addr++;
  69       fprintf_fn (stream, "%s", op->u.name);
  70
  71       /* The tableswitch instruction is followed by the default
  72          address, low value, high value and the destinations.  */
  73
  74       if (strcmp (op->u.name, "tableswitch") == 0)
  75         {
  76           int lowval;
  77           int highval;
  78           int val;
  79
  80           addr = (addr + 3) & ~3;
  81           if ((status = get_int (addr, &val, info)))
  82             goto fail;
  83
  84           fprintf_fn (stream, " default: ");
  85           (*info->print_address_func) (val + insn_start, info);
  86           addr += 4;
  87
  88           if ((status = get_int (addr, &lowval, info)))
  89             goto fail;
  90           addr += 4;
  91
  92           if ((status = get_int (addr, &highval, info)))
  93             goto fail;
  94           addr += 4;
  95
  96           while (lowval <= highval)
  97             {
  98               if ((status = get_int (addr, &val, info)))
  99                 goto fail;
 100               fprintf_fn (stream, " %d:[", lowval);
 101               (*info->print_address_func) (val + insn_start, info);
 102               fprintf_fn (stream, " ]");
 103               addr += 4;
 104               lowval++;
 105             }
 106           return addr - insn_start;
 107         }
 108
 109       /* The lookupswitch instruction is followed by the default
 110          address, element count and pairs of values and
 111          addresses.  */
 112       if (strcmp (op->u.name, "lookupswitch") == 0)
 113         {
 114           int count;
 115           int val;
 116
 117           addr = (addr + 3) & ~3;
 118           if ((status = get_int (addr, &val, info)))
 119             goto fail;
 120           addr += 4;
 121
 122           fprintf_fn (stream, " default: ");
 123           (*info->print_address_func) (val + insn_start, info);
 124
 125           if ((status = get_int (addr, &count, info)))
 126             goto fail;
 127           addr += 4;
 128
 129           while (count--)
 130             {
 131               if ((status = get_int (addr, &val, info)))
 132                 goto fail;
 133               addr += 4;
 134               fprintf_fn (stream, " %d:[", val);
 135
 136               if ((status = get_int (addr, &val, info)))
 137                 goto fail;
 138               addr += 4;
 139
 140               (*info->print_address_func) (val + insn_start, info);
 141               fprintf_fn (stream, " ]");
 142             }
 143           return addr - insn_start;
 144         }
 145
 146       for (a = 0; op->arg[a]; a++)
 147         {
 148           unsigned char data[4];
 149           int val = 0;
 150           int i;
 151           int size = ASIZE (op->arg[a]);
 152
 153           if ((status = info->read_memory_func (addr, data, size, info)))
 154             goto fail;
 155
 156           val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1;
 157
 158           for (i = 0; i < size; i++)
 159             val = (val << 8) | (data[i] & 0xff);
 160
 161           if (PCREL (op->arg[a]))
 162             (*info->print_address_func) (val + insn_start, info);
 163           else
 164             fprintf_fn (stream, "%s%d", sep, val);
 165
 166           sep = ",";
 167           addr += size;
 168         }
 169       return op->len;
 170     }
 171
 172  fail:
 173   info->memory_error_func (status, addr, info);
 174   return -1;
 175 }