/* 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 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 #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 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 CCBITS (0xf0000000L) #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)) #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) bank>0?state->Spsr[bank]:ECC | EINT | EMODE ; #define SETPSR(d,s) d = (s) & (ARMword)(CCBITS | INTBITS | MODEBITS) #define SETINTMODE(d,s) d = ((d) & CCBITS) | ((s) & (INTBITS | MODEBITS)) #define SETCC(d,s) d = ((d) & (INTBITS | MODEBITS)) | ((s) & CCBITS) #define SETR15PSR(s) 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) ; \ } #define SETABORT(i,m) state->Cpsr = ECC | EINT | (i) | (m) #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) if (address < VECTORS) \ state->Aborted = ARMul_DataAbortV ; \ else \ state->Aborted = ARMul_AddrExceptnV ; #ifdef MODE32 #define TAKEABORT ARMul_Abort(state,ARMul_DataAbortV) #else #define TAKEABORT if (state->Aborted == ARMul_AddrExceptnV) \ ARMul_Abort(state,ARMul_AddrExceptnV) ; \ else \ ARMul_Abort(state,ARMul_DataAbortV) #endif #define CPTAKEABORT 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) /***************************************************************************\ * 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 state->Reg[15] += isize ; /* a standard PC inc and an S cycle */ \ state->NextInstr = (state->NextInstr & 0xff) | 2 #define BUSUSEDINCPCN state->Reg[15] += isize ; /* a standard PC inc and an N cycle */ \ state->NextInstr |= 3 #define INCPC state->Reg[15] += isize ; /* a standard PC inc */ \ state->NextInstr |= 2 #define FLUSHPIPE state->NextInstr |= PRIMEPIPE /***************************************************************************\ * Cycle based emulation * \***************************************************************************/ #define OUTPUTCP(i,a,b) #define NCYCLE #define SCYCLE #define ICYCLE #define CCYCLE #define NEXTCYCLE(c) /***************************************************************************\ * States of the cycle based state machine * \***************************************************************************/ /***************************************************************************\ * 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) /***************************************************************************\ * 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) if (DESTReg==15) \ WriteR15(state, d) ; \ else \ DEST = d #define WRITESDEST(d) if (DESTReg == 15) \ WriteSR15(state, d) ; \ else { \ DEST = d ; \ ARMul_NegZero(state, d) ; \ } #define BYTETOBUS(data) ((data & 0xff) | \ ((data & 0xff) << 8) | \ ((data & 0xff) << 16) | \ ((data & 0xff) << 24)) #define BUSTOBYTE(address,data) \ if (state->bigendSig) \ temp = (data >> (((address ^ 3) & 3) << 3)) & 0xff ; \ else \ temp = (data >> ((address & 3) << 3)) & 0xff #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 ARMword ARMul_Emulate26 (ARMul_State * state); extern ARMword ARMul_Emulate32 (ARMul_State * state); 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 */ extern void ARMul_Abort26 (ARMul_State * state, ARMword); extern void ARMul_Abort32 (ARMul_State * state, ARMword); extern unsigned ARMul_NthReg (ARMword instr, unsigned number); extern void ARMul_MSRCpsr (ARMul_State * state, ARMword instr, ARMword rhs); extern void ARMul_NegZero (ARMul_State * state, ARMword result); extern void ARMul_AddCarry (ARMul_State * state, ARMword a, ARMword b, ARMword result); extern int AddOverflow (ARMword a, ARMword b, ARMword result); extern int SubOverflow (ARMword a, ARMword b, ARMword result); extern void ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result); extern void ARMul_SubCarry (ARMul_State * state, ARMword a, ARMword b, ARMword result); extern void ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result); extern void ARMul_CPSRAltered (ARMul_State * state); extern void ARMul_R15Altered (ARMul_State * state); extern ARMword ARMul_SwitchMode (ARMul_State * state, ARMword oldmode, ARMword newmode); extern unsigned ARMul_NthReg (ARMword instr, unsigned number); extern void ARMul_LDC (ARMul_State * state, ARMword instr, ARMword address); extern void ARMul_STC (ARMul_State * state, ARMword instr, ARMword address); extern void ARMul_MCR (ARMul_State * state, ARMword instr, ARMword source); extern ARMword ARMul_MRC (ARMul_State * state, ARMword instr); extern void ARMul_CDP (ARMul_State * state, ARMword instr); extern unsigned IntPending (ARMul_State * state); extern ARMword ARMul_Align (ARMul_State * state, ARMword address, ARMword data); #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; extern tdstate ARMul_ThumbDecode (ARMul_State * state, ARMword pc, ARMword tinstr, ARMword * ainstr); /***************************************************************************\ * 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