common/common.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 1996-2016 The NASM Authors - All Rights Reserved
   4  *   See the file AUTHORS included with the NASM distribution for
   5  *   the specific copyright holders.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following
   9  *   conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright
  12  *     notice, this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above
  14  *     copyright notice, this list of conditions and the following
  15  *     disclaimer in the documentation and/or other materials provided
  16  *     with the distribution.
  17  *
  18  *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
  19  *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
  20  *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  29  *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  30  *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  * ----------------------------------------------------------------------- */
  33
  34 /*
  35  * common.c - code common to nasm and ndisasm
  36  */
  37
  38 #include "compiler.h"
  39 #include "nasm.h"
  40 #include "nasmlib.h"
  41 #include "insns.h"
  42
  43 /*
  44  * The current bit size of the CPU
  45  */
  46 int globalbits = 0;
  47 /*
  48  * Common list of prefix names; ideally should be auto-generated
  49  * from tokens.dat
  50  */
  51 const char *prefix_name(int token)
  52 {
  53     static const char *prefix_names[] = {
  54         "a16", "a32", "a64", "asp", "lock", "o16", "o32", "o64", "osp",
  55         "rep", "repe", "repne", "repnz", "repz", "times", "wait",
  56         "xacquire", "xrelease", "bnd"
  57     };
  58     unsigned int prefix = token-PREFIX_ENUM_START;
  59
  60     if (prefix >= ARRAY_SIZE(prefix_names))
  61         return NULL;
  62
  63     return prefix_names[prefix];
  64 }
  65
  66 /*
  67  * initialized data bytes length from opcode
  68  */
  69 int idata_bytes(int opcode)
  70 {
  71     switch (opcode) {
  72     case I_DB:
  73         return 1;
  74     case I_DW:
  75         return 2;
  76     case I_DD:
  77         return 4;
  78     case I_DQ:
  79         return 8;
  80     case I_DT:
  81         return 10;
  82     case I_DO:
  83         return 16;
  84     case I_DY:
  85         return 32;
  86     case I_DZ:
  87         return 64;
  88     case I_none:
  89         return -1;
  90     default:
  91         return 0;
  92     }
  93 }