git.sur5r.net Git - cc65/blob - src/sim65/cpuregs.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 cpuregs.h                                 */
   4 /*                                                                           */
   5 /*                               CPU registers                               */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2003      Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 52                                             */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef CPUREGS_H
  37 #define CPUREGS_H
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Data                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 typedef struct CPURegs CPURegs;
  48 struct CPURegs {
  49     unsigned    AC;             /* Accumulator */
  50     unsigned    XR;             /* X register */
  51     unsigned    YR;             /* Y register */
  52     unsigned    ZR;             /* Z register */
  53     unsigned    SR;             /* Status register */
  54     unsigned    SP;             /* Stackpointer */
  55     unsigned    PC;             /* Program counter */
  56 };
  57
  58 /* Status register bits */
  59 #define CF      0x01            /* Carry flag */
  60 #define ZF      0x02            /* Zero flag */
  61 #define IF      0x04            /* Interrupt flag */
  62 #define DF      0x08            /* Decimal flag */
  63 #define BF      0x10            /* Break flag */
  64 #define OF      0x40            /* Overflow flag */
  65 #define SF      0x80            /* Sign flag */
  66
  67
  68
  69 /*****************************************************************************/
  70 /*                                   Code                                    */
  71 /*****************************************************************************/
  72
  73
  74
  75 /* End of cpuregs.h */
  76
  77 #endif
  78
  79
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  81