disas/tci.c

   1 /*
   2  * Tiny Code Interpreter for QEMU - disassembler
   3  *
   4  * Copyright (c) 2011 Stefan Weil
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "qemu-common.h"
  22 #include "disas/bfd.h"
  23 #include "tcg/tcg.h"
  24
  25 /* Disassemble TCI bytecode. */
  26 int print_insn_tci(bfd_vma addr, disassemble_info *info)
  27 {
  28     int length;
  29     uint8_t byte;
  30     int status;
  31     TCGOpcode op;
  32
  33     status = info->read_memory_func(addr, &byte, 1, info);
  34     if (status != 0) {
  35         info->memory_error_func(status, addr, info);
  36         return -1;
  37     }
  38     op = byte;
  39
  40     addr++;
  41     status = info->read_memory_func(addr, &byte, 1, info);
  42     if (status != 0) {
  43         info->memory_error_func(status, addr, info);
  44         return -1;
  45     }
  46     length = byte;
  47
  48     if (op >= tcg_op_defs_max) {
  49         info->fprintf_func(info->stream, "illegal opcode %d", op);
  50     } else {
  51         const TCGOpDef *def = &tcg_op_defs[op];
  52         int nb_oargs = def->nb_oargs;
  53         int nb_iargs = def->nb_iargs;
  54         int nb_cargs = def->nb_cargs;
  55         /* TODO: Improve disassembler output. */
  56         info->fprintf_func(info->stream, "%s\to=%d i=%d c=%d",
  57                            def->name, nb_oargs, nb_iargs, nb_cargs);
  58     }
  59
  60     return length;
  61 }