src/m68000/cpudefs.h

   1 //
   2 // Common definitions for the UAE 68000 core
   3 //
   4 // by James Hammons
   5 // (C) 2011 Underground Software
   6 //
   7 // This file is distributed under the GNU Public License, version 3 or at your
   8 // option any later version. Read the file GPLv3 for details.
   9 //
  10
  11 #ifndef __CPUDEFS_H__
  12 #define __CPUDEFS_H__
  13
  14 #include "sysdeps.h"
  15
  16 /* Special flags */
  17 #define SPCFLAG_DEBUGGER      0x001
  18 #define SPCFLAG_STOP          0x002
  19 #define SPCFLAG_BUSERROR      0x004
  20 #define SPCFLAG_INT           0x008
  21 #define SPCFLAG_BRK           0x010
  22 #define SPCFLAG_EXTRA_CYCLES  0x020
  23 #define SPCFLAG_TRACE         0x040
  24 #define SPCFLAG_DOTRACE       0x080
  25 #define SPCFLAG_DOINT         0x100
  26 #define SPCFLAG_MFP           0x200
  27 #define SPCFLAG_EXEC          0x400
  28 #define SPCFLAG_MODE_CHANGE   0x800
  29
  30 struct regstruct
  31 {
  32         uint32_t regs[16];
  33         uint32_t usp, isp;
  34         uint16_t sr;
  35         uint8_t s;
  36         uint8_t stopped;
  37         int intmask;
  38         int intLevel;
  39
  40         unsigned int c;
  41         unsigned int z;
  42         unsigned int n;
  43         unsigned int v;
  44         unsigned int x;
  45
  46         uint32_t pc;
  47         uint8_t * pc_p;
  48         uint8_t * pc_oldp;
  49
  50         uint32_t spcflags;
  51
  52         uint32_t prefetch_pc;
  53         uint32_t prefetch;
  54
  55         int32_t remainingCycles;
  56         uint32_t interruptCycles;
  57 };
  58
  59 extern struct regstruct regs, lastint_regs;
  60
  61 #define m68k_dreg(r, num) ((r).regs[(num)])
  62 #define m68k_areg(r, num) (((r).regs + 8)[(num)])
  63
  64 #define ZFLG (regs.z)
  65 #define NFLG (regs.n)
  66 #define CFLG (regs.c)
  67 #define VFLG (regs.v)
  68 #define XFLG (regs.x)
  69
  70 /* Possible exceptions sources for M68000_Exception() and Exception() */
  71 #define M68000_EXC_SRC_CPU      1  /* Direct CPU exception */
  72 #define M68000_EXC_SRC_AUTOVEC  2  /* Auto-vector exception (e.g. VBL) */
  73 //#define M68000_EXC_SRC_INT_MFP  3  /* MFP interrupt exception */
  74 //#define M68000_EXC_SRC_INT_DSP  4  /* DSP interrupt exception */
  75
  76 #define SET_CFLG(x) (CFLG = (x))
  77 #define SET_NFLG(x) (NFLG = (x))
  78 #define SET_VFLG(x) (VFLG = (x))
  79 #define SET_ZFLG(x) (ZFLG = (x))
  80 #define SET_XFLG(x) (XFLG = (x))
  81
  82 #define GET_CFLG CFLG
  83 #define GET_NFLG NFLG
  84 #define GET_VFLG VFLG
  85 #define GET_ZFLG ZFLG
  86 #define GET_XFLG XFLG
  87
  88 #define CLEAR_CZNV do { \
  89  SET_CFLG(0); \
  90  SET_ZFLG(0); \
  91  SET_NFLG(0); \
  92  SET_VFLG(0); \
  93 } while (0)
  94
  95 #define COPY_CARRY (SET_XFLG(GET_CFLG))
  96
  97 #endif  // __CPUDEFS_H__