lib/3rdparty/softx86/softx86/clc.c

   1 /*
   2  * clc.c
   3  *
   4  * Copyright (C) 2003, 2004 Jonathan Campbell <jcampbell@mdjk.com>
   5  *
   6  * Decompiler and executioneer for CLC/CLD/CLI/CMC/STC/STD/STI instructions.
   7  *
   8  ***********************************************************************************
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  ************************************************************************************/
  23
  24 #include <softx86.h>
  25 #include <memory.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include "optable.h"
  29 #include "clc.h"
  30 #include "drooling_duh.h"
  31
  32 int Sfx86OpcodeExec_clx(sx86_ubyte opcode,softx86_ctx* ctx)
  33 {
  34         if (opcode == 0xF5) {                                           // CMC
  35                 ctx->state->reg_flags.val ^=  SX86_CPUFLAG_CARRY;
  36                 return 1;
  37         }
  38
  39         if (opcode == 0xF8) {                                           // CLC
  40                 ctx->state->reg_flags.val &= ~SX86_CPUFLAG_CARRY;
  41                 return 1;
  42         }
  43
  44         if (opcode == 0xF9) {                                           // STC
  45                 ctx->state->reg_flags.val |=  SX86_CPUFLAG_CARRY;
  46                 return 1;
  47         }
  48
  49         if (opcode == 0xFA) {                                           // CLI
  50                 ctx->state->reg_flags.val &= ~SX86_CPUFLAG_INTENABLE;
  51                 return 1;
  52         }
  53
  54         if (opcode == 0xFB) {                                           // STI
  55                 ctx->state->reg_flags.val |=  SX86_CPUFLAG_INTENABLE;
  56                 return 1;
  57         }
  58
  59         if (opcode == 0xFC) {                                           // CLD
  60                 ctx->state->reg_flags.val &= ~SX86_CPUFLAG_DIRECTIONREV;
  61                 return 1;
  62         }
  63
  64         if (opcode == 0xFD) {                                           // STD
  65                 ctx->state->reg_flags.val |=  SX86_CPUFLAG_DIRECTIONREV;
  66                 return 1;
  67         }
  68
  69         return 0;
  70 }
  71
  72 int Sfx86OpcodeDec_clx(sx86_ubyte opcode,softx86_ctx* ctx,char buf[128])
  73 {
  74         if (opcode == 0xF5) {                                           // CMC
  75                 strcpy(buf,"CMC");
  76                 return 1;
  77         }
  78
  79         if (opcode == 0xF8) {                                           // CLC
  80                 strcpy(buf,"CLC");
  81                 return 1;
  82         }
  83
  84         if (opcode == 0xF9) {                                           // STC
  85                 strcpy(buf,"STC");
  86                 return 1;
  87         }
  88
  89         if (opcode == 0xFA) {                                           // CLI
  90                 strcpy(buf,"CLI");
  91                 return 1;
  92         }
  93
  94         if (opcode == 0xFB) {                                           // STI
  95                 strcpy(buf,"STI");
  96                 return 1;
  97         }
  98
  99         if (opcode == 0xFC) {                                           // CLD
 100                 strcpy(buf,"CLD");
 101                 return 1;
 102         }
 103
 104         if (opcode == 0xFD) {                                           // STD
 105                 strcpy(buf,"STD");
 106                 return 1;
 107         }
 108
 109         return 0;
 110 }