path: root/sim/arm/armemu.h

/*  armemu.h -- ARMulator emulation macros:  ARM6 Instruction Emulator.
    Copyright (C) 1994 Advanced RISC Machines Ltd.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */

extern ARMword isize;

/* Condition code values.  */
#define EQ 0
#define NE 1
#define CS 2
#define CC 3
#define MI 4
#define PL 5
#define VS 6
#define VC 7
#define HI 8
#define LS 9
#define GE 10
#define LT 11
#define GT 12
#define LE 13
#define AL 14
#define NV 15

/* Shift Opcodes.  */
#define LSL 0
#define LSR 1
#define ASR 2
#define ROR 3

/* Macros to twiddle the status flags and mode.  */
#define NBIT ((unsigned)1L << 31)
#define ZBIT (1L << 30)
#define CBIT (1L << 29)
#define VBIT (1L << 28)
#define SBIT (1L << 27)
#define IBIT (1L << 7)
#define FBIT (1L << 6)
#define IFBITS (3L << 6)
#define R15IBIT (1L << 27)
#define R15FBIT (1L << 26)
#define R15IFBITS (3L << 26)

#define POS(i) ( (~(i)) >> 31 )
#define NEG(i) ( (i) >> 31 )

#ifdef MODET			/* Thumb support.  */
/* ??? This bit is actually in the low order bit of the PC in the hardware.
   It isn't clear if the simulator needs to model that or not.  */
#define TBIT (1L << 5)
#define TFLAG state->TFlag
#define SETT state->TFlag = 1
#define CLEART state->TFlag = 0
#define ASSIGNT(res) state->TFlag = res
#define INSN_SIZE (TFLAG ? 2 : 4)
#else
#define INSN_SIZE 4
#endif

#define NFLAG state->NFlag
#define SETN state->NFlag = 1
#define CLEARN state->NFlag = 0
#define ASSIGNN(res) state->NFlag = res

#define ZFLAG state->ZFlag
#define SETZ state->ZFlag = 1
#define CLEARZ state->ZFlag = 0
#define ASSIGNZ(res) state->ZFlag = res

#define CFLAG state->CFlag
#define SETC state->CFlag = 1
#define CLEARC state->CFlag = 0
#define ASSIGNC(res) state->CFlag = res

#define VFLAG state->VFlag
#define SETV state->VFlag = 1
#define CLEARV state->VFlag = 0
#define ASSIGNV(res) state->VFlag = res

#define SFLAG state->SFlag
#define SETS state->SFlag = 1
#define CLEARS state->SFlag = 0
#define ASSIGNS(res) state->SFlag = res

#define IFLAG (state->IFFlags >> 1)
#define FFLAG (state->IFFlags & 1)
#define IFFLAGS state->IFFlags
#define ASSIGNINT(res) state->IFFlags = (((res) >> 6) & 3)
#define ASSIGNR15INT(res) state->IFFlags = (((res) >> 26) & 3) ;

#define PSR_FBITS (0xff000000L)
#define PSR_SBITS (0x00ff0000L)
#define PSR_XBITS (0x0000ff00L)
#define PSR_CBITS (0x000000ffL)

#if defined MODE32 || defined MODET
#define CCBITS (0xf8000000L)
#else
#define CCBITS (0xf0000000L)
#endif

#define INTBITS (0xc0L)

#if defined MODET && defined MODE32
#define PCBITS (0xffffffffL)
#else
#define PCBITS (0xfffffffcL)
#endif

#define MODEBITS (0x1fL)
#define R15INTBITS (3L << 26)

#if defined MODET && defined MODE32
#define R15PCBITS (0x03ffffffL)
#else
#define R15PCBITS (0x03fffffcL)
#endif

#define R15PCMODEBITS (0x03ffffffL)
#define R15MODEBITS (0x3L)

#ifdef MODE32
#define PCMASK PCBITS
#define PCWRAP(pc) (pc)
#else
#define PCMASK R15PCBITS
#define PCWRAP(pc) ((pc) & R15PCBITS)
#endif

#define PC (state->Reg[15] & PCMASK)
#define R15CCINTMODE (state->Reg[15] & (CCBITS | R15INTBITS | R15MODEBITS))
#define R15INT (state->Reg[15] & R15INTBITS)
#define R15INTPC (state->Reg[15] & (R15INTBITS | R15PCBITS))
#define R15INTPCMODE (state->Reg[15] & (R15INTBITS | R15PCBITS | R15MODEBITS))
#define R15INTMODE (state->Reg[15] & (R15INTBITS | R15MODEBITS))
#define R15PC (state->Reg[15] & R15PCBITS)
#define R15PCMODE (state->Reg[15] & (R15PCBITS | R15MODEBITS))
#define R15MODE (state->Reg[15] & R15MODEBITS)

#define ECC ((NFLAG << 31) | (ZFLAG << 30) | (CFLAG << 29) | (VFLAG << 28) | (SFLAG << 27))
#define EINT (IFFLAGS << 6)
#define ER15INT (IFFLAGS << 26)
#define EMODE (state->Mode)

#ifdef MODET
#define CPSR (ECC | EINT | EMODE | (TFLAG << 5))
#else
#define CPSR (ECC | EINT | EMODE)
#endif

#ifdef MODE32
#define PATCHR15
#else
#define PATCHR15 state->Reg[15] = ECC | ER15INT | EMODE | R15PC
#endif

#define GETSPSR(bank) (ARMul_GetSPSR (state, EMODE))
#define SETPSR_F(d,s) d = ((d) & ~PSR_FBITS) | ((s) & PSR_FBITS)
#define SETPSR_S(d,s) d = ((d) & ~PSR_SBITS) | ((s) & PSR_SBITS)
#define SETPSR_X(d,s) d = ((d) & ~PSR_XBITS) | ((s) & PSR_XBITS)
#define SETPSR_C(d,s) d = ((d) & ~PSR_CBITS) | ((s) & PSR_CBITS)

#define SETR15PSR(s) 								\
  do										\
    {										\
      if (state->Mode == USER26MODE)						\
        {									\
          state->Reg[15] = ((s) & CCBITS) | R15PC | ER15INT | EMODE;		\
          ASSIGNN ((state->Reg[15] & NBIT) != 0);				\
          ASSIGNZ ((state->Reg[15] & ZBIT) != 0);				\
          ASSIGNC ((state->Reg[15] & CBIT) != 0);				\
          ASSIGNV ((state->Reg[15] & VBIT) != 0);				\
        }									\
      else									\
        {									\
          state->Reg[15] = R15PC | ((s) & (CCBITS | R15INTBITS | R15MODEBITS));	\
          ARMul_R15Altered (state);						\
       }									\
    }										\
  while (0)
     
#define SETABORT(i, m, d)						\
  do									\
    { 									\
      int SETABORT_mode = (m);						\
									\
      ARMul_SetSPSR (state, SETABORT_mode, ARMul_GetCPSR (state));	\
      ARMul_SetCPSR (state, ((ARMul_GetCPSR (state) & ~(EMODE | TBIT))	\
			     | (i) | SETABORT_mode));			\
      state->Reg[14] = temp - (d);					\
    }									\
  while (0)

#ifndef MODE32
#define VECTORS 0x20
#define LEGALADDR 0x03ffffff
#define VECTORACCESS(address) (address < VECTORS && ARMul_MODE26BIT && state->prog32Sig)
#define ADDREXCEPT(address)   (address > LEGALADDR && !state->data32Sig)
#endif

#define INTERNALABORT(address)			\
  do						\
    {						\
      if (address < VECTORS)			\
	state->Aborted = ARMul_DataAbortV;	\
      else					\
	state->Aborted = ARMul_AddrExceptnV;	\
    }						\
  while (0)

#ifdef MODE32
#define TAKEABORT ARMul_Abort (state, ARMul_DataAbortV)
#else
#define TAKEABORT 					\
  do							\
    {							\
      if (state->Aborted == ARMul_AddrExceptnV) 	\
	ARMul_Abort (state, ARMul_AddrExceptnV); 	\
      else 						\
	ARMul_Abort (state, ARMul_DataAbortV);		\
    }							\
  while (0)
#endif

#define CPTAKEABORT					\
  do							\
    {							\
      if (!state->Aborted)				\
	ARMul_Abort (state, ARMul_UndefinedInstrV); 	\
      else if (state->Aborted == ARMul_AddrExceptnV) 	\
	ARMul_Abort (state, ARMul_AddrExceptnV); 	\
      else 						\
	ARMul_Abort (state, ARMul_DataAbortV);		\
    }							\
  while (0);


/* Different ways to start the next instruction.  */
#define SEQ           0
#define NONSEQ        1
#define PCINCEDSEQ    2
#define PCINCEDNONSEQ 3
#define PRIMEPIPE     4
#define RESUME        8

#define NORMALCYCLE state->NextInstr = 0
#define BUSUSEDN    state->NextInstr |= 1  /* The next fetch will be an N cycle.  */
#define BUSUSEDINCPCS						\
  do								\
    {								\
      if (! state->is_v4)					\
        {							\
	  /* A standard PC inc and an S cycle.  */		\
	  state->Reg[15] += isize;				\
	  state->NextInstr = (state->NextInstr & 0xff) | 2;	\
	}							\
    }								\
  while (0)

#define BUSUSEDINCPCN					\
  do							\
    {							\
      if (state->is_v4)					\
	BUSUSEDN;					\
      else						\
	{						\
	  /* A standard PC inc and an N cycle.  */	\
	  state->Reg[15] += isize;			\
	  state->NextInstr |= 3;			\
	}						\
    }							\
  while (0)

#define INCPC 			\
  do				\
    {				\
      /* A standard PC inc.  */	\
      state->Reg[15] += isize;	\
      state->NextInstr |= 2;	\
    }				\
  while (0)

#define FLUSHPIPE state->NextInstr |= PRIMEPIPE

/* Cycle based emulation.  */

#define OUTPUTCP(i,a,b)
#define NCYCLE
#define SCYCLE
#define ICYCLE
#define CCYCLE
#define NEXTCYCLE(c)

/* Macros to extract parts of instructions.  */
#define DESTReg (BITS (12, 15))
#define LHSReg  (BITS (16, 19))
#define RHSReg  (BITS ( 0,  3))

#define DEST (state->Reg[DESTReg])

#ifdef MODE32
#ifdef MODET
#define LHS ((LHSReg == 15) ? (state->Reg[15] & 0xFFFFFFFC): (state->Reg[LHSReg]))
#else
#define LHS (state->Reg[LHSReg])
#endif
#else
#define LHS ((LHSReg == 15) ? R15PC : (state->Reg[LHSReg]))
#endif

#define MULDESTReg (BITS (16, 19))
#define MULLHSReg  (BITS ( 0,  3))
#define MULRHSReg  (BITS ( 8, 11))
#define MULACCReg  (BITS (12, 15))

#define DPImmRHS (ARMul_ImmedTable[BITS(0, 11)])
#define DPSImmRHS temp = BITS(0,11) ; \
                  rhs = ARMul_ImmedTable[temp] ; \
                  if (temp > 255) /* There was a shift.  */ \
                     ASSIGNC (rhs >> 31) ;

#ifdef MODE32
#define DPRegRHS  ((BITS (4,11) == 0) ? state->Reg[RHSReg] \
                                      : GetDPRegRHS (state, instr))
#define DPSRegRHS ((BITS (4,11) == 0) ? state->Reg[RHSReg] \
                                      : GetDPSRegRHS (state, instr))
#else
#define DPRegRHS  ((BITS (0, 11) < 15) ? state->Reg[RHSReg] \
                                       : GetDPRegRHS (state, instr))
#define DPSRegRHS ((BITS (0, 11) < 15) ? state->Reg[RHSReg] \
                                       : GetDPSRegRHS (state, instr))
#endif

#define LSBase state->Reg[LHSReg]
#define LSImmRHS (BITS(0,11))

#ifdef MODE32
#define LSRegRHS ((BITS (4, 11) == 0) ? state->Reg[RHSReg] \
                                      : GetLSRegRHS (state, instr))
#else
#define LSRegRHS ((BITS (0, 11) < 15) ? state->Reg[RHSReg] \
                                      : GetLSRegRHS (state, instr))
#endif

#define LSMNumRegs ((ARMword) ARMul_BitList[BITS (0, 7)] + \
                    (ARMword) ARMul_BitList[BITS (8, 15)] )
#define LSMBaseFirst ((LHSReg == 0 && BIT (0)) || \
                      (BIT (LHSReg) && BITS (0, LHSReg - 1) == 0))

#define SWAPSRC (state->Reg[RHSReg])

#define LSCOff (BITS (0, 7) << 2)
#define CPNum   BITS (8, 11)

/* Determine if access to coprocessor CP is permitted.
   The XScale has a register in CP15 which controls access to CP0 - CP13.  */
#define CP_ACCESS_ALLOWED(STATE, CP)			\
    (   ((CP) >= 14)					\
     || (! (STATE)->is_XScale)				\
     || (read_cp15_reg (15, 0, 1) & (1 << (CP))))

/* Macro to rotate n right by b bits.  */
#define ROTATER(n, b) (((n) >> (b)) | ((n) << (32 - (b))))

/* Macros to store results of instructions.  */
#define WRITEDEST(d)				\
  do						\
    {						\
      if (DESTReg == 15) 			\
	WriteR15 (state, d); 			\
      else 					\
	DEST = d;				\
    }						\
  while (0)

#define WRITESDEST(d)				\
  do						\
    {						\
      if (DESTReg == 15)			\
	WriteSR15 (state, d);			\
      else					\
	{					\
	  DEST = d;				\
	  ARMul_NegZero (state, d);		\
	}					\
    }						\
  while (0)

#define WRITEDESTB(d)				\
  do						\
    {						\
      if (DESTReg == 15)			\
	WriteR15Branch (state, d);		\
      else					\
	DEST = d;				\
    }						\
  while (0)

#define BYTETOBUS(data) ((data & 0xff) | \
                        ((data & 0xff) << 8) | \
                        ((data & 0xff) << 16) | \
                        ((data & 0xff) << 24))

#define BUSTOBYTE(address, data)				\
  do								\
    {								\
      if (state->bigendSig) 					\
	temp = (data >> (((address ^ 3) & 3) << 3)) & 0xff;	\
      else							\
	temp = (data >> ((address & 3) << 3)) & 0xff;		\
    }								\
  while (0)

#define LOADMULT(instr,   address, wb)  LoadMult   (state, instr, address, wb)
#define LOADSMULT(instr,  address, wb)  LoadSMult  (state, instr, address, wb)
#define STOREMULT(instr,  address, wb)  StoreMult  (state, instr, address, wb)
#define STORESMULT(instr, address, wb)  StoreSMult (state, instr, address, wb)

#define POSBRANCH ((instr & 0x7fffff) << 2)
#define NEGBRANCH ((0xff000000 |(instr & 0xffffff)) << 2)


/* Values for Emulate.  */
#define STOP            0	/* stop */
#define CHANGEMODE      1	/* change mode */
#define ONCE            2	/* execute just one interation */
#define RUN             3	/* continuous execution */

/* Stuff that is shared across modes.  */
extern unsigned ARMul_MultTable[];	/* Number of I cycles for a mult.  */
extern ARMword  ARMul_ImmedTable[];	/* Immediate DP LHS values.  */
extern char     ARMul_BitList[];	/* Number of bits in a byte table.  */

#define EVENTLISTSIZE 1024L

/* Thumb support.  */
typedef enum
{
  t_undefined,		/* Undefined Thumb instruction.  */
  t_decoded,		/* Instruction decoded to ARM equivalent.  */
  t_branch		/* Thumb branch (already processed).  */
}
tdstate;

/* Macros to scrutinize instructions.  */
#define UNDEF_Test
#define UNDEF_Shift
#define UNDEF_MSRPC
#define UNDEF_MRSPC
#define UNDEF_MULPCDest
#define UNDEF_MULDestEQOp1
#define UNDEF_LSRBPC
#define UNDEF_LSRBaseEQOffWb
#define UNDEF_LSRBaseEQDestWb
#define UNDEF_LSRPCBaseWb
#define UNDEF_LSRPCOffWb
#define UNDEF_LSMNoRegs
#define UNDEF_LSMPCBase
#define UNDEF_LSMUserBankWb
#define UNDEF_LSMBaseInListWb
#define UNDEF_SWPPC
#define UNDEF_CoProHS
#define UNDEF_MCRPC
#define UNDEF_LSCPCBaseWb
#define UNDEF_UndefNotBounced
#define UNDEF_ShortInt
#define UNDEF_IllegalMode
#define UNDEF_Prog32SigChange
#define UNDEF_Data32SigChange

/* Prototypes for exported functions.  */
extern unsigned ARMul_NthReg        (ARMword, unsigned);
extern int      AddOverflow         (ARMword, ARMword, ARMword);
extern int      SubOverflow         (ARMword, ARMword, ARMword);
extern ARMword  ARMul_Emulate26     (ARMul_State *);
extern ARMword  ARMul_Emulate32     (ARMul_State *);
extern unsigned IntPending          (ARMul_State *);
extern void     ARMul_CPSRAltered   (ARMul_State *);
extern void     ARMul_R15Altered    (ARMul_State *);
extern ARMword  ARMul_GetPC         (ARMul_State *);
extern ARMword  ARMul_GetNextPC     (ARMul_State *);
extern ARMword  ARMul_GetR15        (ARMul_State *);
extern ARMword  ARMul_GetCPSR       (ARMul_State *);
extern void     ARMul_EnvokeEvent   (ARMul_State *);
extern unsigned long ARMul_Time     (ARMul_State *);
extern void     ARMul_NegZero       (ARMul_State *, ARMword);
extern void     ARMul_SetPC         (ARMul_State *, ARMword);
extern void     ARMul_SetR15        (ARMul_State *, ARMword);
extern void     ARMul_SetCPSR       (ARMul_State *, ARMword);
extern ARMword  ARMul_GetSPSR       (ARMul_State *, ARMword);
extern void     ARMul_Abort26       (ARMul_State *, ARMword);
extern void     ARMul_Abort32       (ARMul_State *, ARMword);
extern ARMword  ARMul_MRC           (ARMul_State *, ARMword);
extern void     ARMul_CDP           (ARMul_State *, ARMword);
extern void     ARMul_LDC           (ARMul_State *, ARMword, ARMword);
extern void     ARMul_STC           (ARMul_State *, ARMword, ARMword);
extern void     ARMul_MCR           (ARMul_State *, ARMword, ARMword);
extern void     ARMul_SetSPSR       (ARMul_State *, ARMword, ARMword);
extern ARMword  ARMul_SwitchMode    (ARMul_State *, ARMword, ARMword);
extern ARMword  ARMul_Align         (ARMul_State *, ARMword, ARMword);
extern ARMword  ARMul_SwitchMode    (ARMul_State *, ARMword, ARMword);
extern void     ARMul_MSRCpsr       (ARMul_State *, ARMword, ARMword);
extern void     ARMul_SubOverflow   (ARMul_State *, ARMword, ARMword, ARMword);
extern void     ARMul_AddOverflow   (ARMul_State *, ARMword, ARMword, ARMword);
extern void     ARMul_SubCarry      (ARMul_State *, ARMword, ARMword, ARMword);
extern void     ARMul_AddCarry      (ARMul_State *, ARMword, ARMword, ARMword);
extern tdstate  ARMul_ThumbDecode   (ARMul_State *, ARMword, ARMword, ARMword *);
extern ARMword  ARMul_GetReg        (ARMul_State *, unsigned, unsigned);
extern void     ARMul_SetReg        (ARMul_State *, unsigned, unsigned, ARMword);
extern void     ARMul_ScheduleEvent (ARMul_State *, unsigned long, unsigned (*) (ARMul_State *));
/* Coprocessor support functions.  */
extern unsigned ARMul_CoProInit     (ARMul_State *);
extern void     ARMul_CoProExit     (ARMul_State *);
extern void     ARMul_CoProAttach   (ARMul_State *, unsigned, ARMul_CPInits *, ARMul_CPExits *,
				     ARMul_LDCs *, ARMul_STCs *, ARMul_MRCs *, ARMul_MCRs *,
				     ARMul_CDPs *, ARMul_CPReads *, ARMul_CPWrites *);
extern void     ARMul_CoProDetach   (ARMul_State *, unsigned);
extern ARMword  read_cp15_reg       (unsigned, unsigned, unsigned);