1 /* armemu.h -- ARMulator emulation macros: ARM6 Instruction Emulator.
2 Copyright (C) 1994 Advanced RISC Machines Ltd.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /***************************************************************************\
21 * Condition code values *
22 \***************************************************************************/
41 /***************************************************************************\
43 \***************************************************************************/
50 /***************************************************************************\
51 * Macros to twiddle the status flags and mode *
52 \***************************************************************************/
54 #define NBIT ((unsigned)1L << 31)
55 #define ZBIT (1L << 30)
56 #define CBIT (1L << 29)
57 #define VBIT (1L << 28)
58 #define IBIT (1L << 7)
59 #define FBIT (1L << 6)
60 #define IFBITS (3L << 6)
61 #define R15IBIT (1L << 27)
62 #define R15FBIT (1L << 26)
63 #define R15IFBITS (3L << 26)
65 #define POS(i) ( (~(i)) >> 31 )
66 #define NEG(i) ( (i) >> 31 )
68 #ifdef MODET /* Thumb support */
69 /* ??? This bit is actually in the low order bit of the PC in the hardware.
70 It isn't clear if the simulator needs to model that or not. */
71 #define TBIT (1L << 5)
72 #define TFLAG state->TFlag
73 #define SETT state->TFlag = 1
74 #define CLEART state->TFlag = 0
75 #define ASSIGNT(res) state->TFlag = res
78 #define NFLAG state->NFlag
79 #define SETN state->NFlag = 1
80 #define CLEARN state->NFlag = 0
81 #define ASSIGNN(res) state->NFlag = res
83 #define ZFLAG state->ZFlag
84 #define SETZ state->ZFlag = 1
85 #define CLEARZ state->ZFlag = 0
86 #define ASSIGNZ(res) state->ZFlag = res
88 #define CFLAG state->CFlag
89 #define SETC state->CFlag = 1
90 #define CLEARC state->CFlag = 0
91 #define ASSIGNC(res) state->CFlag = res
93 #define VFLAG state->VFlag
94 #define SETV state->VFlag = 1
95 #define CLEARV state->VFlag = 0
96 #define ASSIGNV(res) state->VFlag = res
98 #define IFLAG (state->IFFlags >> 1)
99 #define FFLAG (state->IFFlags & 1)
100 #define IFFLAGS state->IFFlags
101 #define ASSIGNINT(res) state->IFFlags = (((res) >> 6) & 3)
102 #define ASSIGNR15INT(res) state->IFFlags = (((res) >> 26) & 3) ;
104 #define CCBITS (0xf0000000L)
105 #define INTBITS (0xc0L)
107 #if defined MODET && defined MODE32
108 #define PCBITS (0xffffffffL)
110 #define PCBITS (0xfffffffcL)
113 #define MODEBITS (0x1fL)
114 #define R15INTBITS (3L << 26)
116 #if defined MODET && defined MODE32
117 #define R15PCBITS (0x03ffffffL)
119 #define R15PCBITS (0x03fffffcL)
122 #define R15PCMODEBITS (0x03ffffffL)
123 #define R15MODEBITS (0x3L)
126 #define PCMASK PCBITS
127 #define PCWRAP(pc) (pc)
129 #define PCMASK R15PCBITS
130 #define PCWRAP(pc) ((pc) & R15PCBITS)
133 #define PC (state->Reg[15] & PCMASK)
134 #define R15CCINTMODE (state->Reg[15] & (CCBITS | R15INTBITS | R15MODEBITS))
135 #define R15INT (state->Reg[15] & R15INTBITS)
136 #define R15INTPC (state->Reg[15] & (R15INTBITS | R15PCBITS))
137 #define R15INTPCMODE (state->Reg[15] & (R15INTBITS | R15PCBITS | R15MODEBITS))
138 #define R15INTMODE (state->Reg[15] & (R15INTBITS | R15MODEBITS))
139 #define R15PC (state->Reg[15] & R15PCBITS)
140 #define R15PCMODE (state->Reg[15] & (R15PCBITS | R15MODEBITS))
141 #define R15MODE (state->Reg[15] & R15MODEBITS)
143 #define ECC ((NFLAG << 31) | (ZFLAG << 30) | (CFLAG << 29) | (VFLAG << 28))
144 #define EINT (IFFLAGS << 6)
145 #define ER15INT (IFFLAGS << 26)
146 #define EMODE (state->Mode)
149 #define CPSR (ECC | EINT | EMODE | (TFLAG << 5))
151 #define CPSR (ECC | EINT | EMODE)
157 #define PATCHR15 state->Reg[15] = ECC | ER15INT | EMODE | R15PC
160 #define GETSPSR(bank) bank>0?state->Spsr[bank]:ECC | EINT | EMODE ;
161 #define SETPSR(d,s) d = (s) & (ARMword)(CCBITS | INTBITS | MODEBITS)
162 #define SETINTMODE(d,s) d = ((d) & CCBITS) | ((s) & (INTBITS | MODEBITS))
163 #define SETCC(d,s) d = ((d) & (INTBITS | MODEBITS)) | ((s) & CCBITS)
164 #define SETR15PSR(s) if (state->Mode == USER26MODE) { \
165 state->Reg[15] = ((s) & CCBITS) | R15PC | ER15INT | EMODE ; \
166 ASSIGNN((state->Reg[15] & NBIT) != 0) ; \
167 ASSIGNZ((state->Reg[15] & ZBIT) != 0) ; \
168 ASSIGNC((state->Reg[15] & CBIT) != 0) ; \
169 ASSIGNV((state->Reg[15] & VBIT) != 0) ; \
172 state->Reg[15] = R15PC | (s) & (CCBITS | R15INTBITS | R15MODEBITS) ; \
173 ARMul_R15Altered(state) ; \
175 #define SETABORT(i,m) state->Cpsr = ECC | EINT | (i) | (m)
179 #define LEGALADDR 0x03ffffff
180 #define VECTORACCESS(address) (address < VECTORS && ARMul_MODE26BIT && state->prog32Sig)
181 #define ADDREXCEPT(address) (address > LEGALADDR && !state->data32Sig)
184 #define INTERNALABORT(address) if (address < VECTORS) \
185 state->Aborted = ARMul_DataAbortV ; \
187 state->Aborted = ARMul_AddrExceptnV ;
190 #define TAKEABORT ARMul_Abort(state,ARMul_DataAbortV)
192 #define TAKEABORT if (state->Aborted == ARMul_AddrExceptnV) \
193 ARMul_Abort(state,ARMul_AddrExceptnV) ; \
195 ARMul_Abort(state,ARMul_DataAbortV)
197 #define CPTAKEABORT if (!state->Aborted) \
198 ARMul_Abort(state,ARMul_UndefinedInstrV) ; \
199 else if (state->Aborted == ARMul_AddrExceptnV) \
200 ARMul_Abort(state,ARMul_AddrExceptnV) ; \
202 ARMul_Abort(state,ARMul_DataAbortV)
205 /***************************************************************************\
206 * Different ways to start the next instruction *
207 \***************************************************************************/
212 #define PCINCEDNONSEQ 3
216 #define NORMALCYCLE state->NextInstr = 0
217 #define BUSUSEDN state->NextInstr |= 1 /* the next fetch will be an N cycle */
218 #define BUSUSEDINCPCS state->Reg[15] += isize ; /* a standard PC inc and an S cycle */ \
219 state->NextInstr = (state->NextInstr & 0xff) | 2
220 #define BUSUSEDINCPCN state->Reg[15] += isize ; /* a standard PC inc and an N cycle */ \
221 state->NextInstr |= 3
222 #define INCPC state->Reg[15] += isize ; /* a standard PC inc */ \
223 state->NextInstr |= 2
224 #define FLUSHPIPE state->NextInstr |= PRIMEPIPE
226 /***************************************************************************\
227 * Cycle based emulation *
228 \***************************************************************************/
230 #define OUTPUTCP(i,a,b)
237 /***************************************************************************\
238 * States of the cycle based state machine *
239 \***************************************************************************/
242 /***************************************************************************\
243 * Macros to extract parts of instructions *
244 \***************************************************************************/
246 #define DESTReg (BITS(12,15))
247 #define LHSReg (BITS(16,19))
248 #define RHSReg (BITS(0,3))
250 #define DEST (state->Reg[DESTReg])
254 #define LHS ((LHSReg == 15) ? (state->Reg[15] & 0xFFFFFFFC): (state->Reg[LHSReg]))
256 #define LHS (state->Reg[LHSReg])
259 #define LHS ((LHSReg == 15) ? R15PC : (state->Reg[LHSReg]) )
262 #define MULDESTReg (BITS(16,19))
263 #define MULLHSReg (BITS(0,3))
264 #define MULRHSReg (BITS(8,11))
265 #define MULACCReg (BITS(12,15))
267 #define DPImmRHS (ARMul_ImmedTable[BITS(0,11)])
268 #define DPSImmRHS temp = BITS(0,11) ; \
269 rhs = ARMul_ImmedTable[temp] ; \
270 if (temp > 255) /* there was a shift */ \
274 #define DPRegRHS ((BITS(4,11)==0) ? state->Reg[RHSReg] \
275 : GetDPRegRHS(state, instr))
276 #define DPSRegRHS ((BITS(4,11)==0) ? state->Reg[RHSReg] \
277 : GetDPSRegRHS(state, instr))
279 #define DPRegRHS ((BITS(0,11)<15) ? state->Reg[RHSReg] \
280 : GetDPRegRHS(state, instr))
281 #define DPSRegRHS ((BITS(0,11)<15) ? state->Reg[RHSReg] \
282 : GetDPSRegRHS(state, instr))
285 #define LSBase state->Reg[LHSReg]
286 #define LSImmRHS (BITS(0,11))
289 #define LSRegRHS ((BITS(4,11)==0) ? state->Reg[RHSReg] \
290 : GetLSRegRHS(state, instr))
292 #define LSRegRHS ((BITS(0,11)<15) ? state->Reg[RHSReg] \
293 : GetLSRegRHS(state, instr))
296 #define LSMNumRegs ((ARMword)ARMul_BitList[BITS(0,7)] + \
297 (ARMword)ARMul_BitList[BITS(8,15)] )
298 #define LSMBaseFirst ((LHSReg == 0 && BIT(0)) || \
299 (BIT(LHSReg) && BITS(0,LHSReg-1) == 0))
301 #define SWAPSRC (state->Reg[RHSReg])
303 #define LSCOff (BITS(0,7) << 2)
304 #define CPNum BITS(8,11)
306 /***************************************************************************\
307 * Macro to rotate n right by b bits *
308 \***************************************************************************/
310 #define ROTATER(n,b) (((n)>>(b))|((n)<<(32-(b))))
312 /***************************************************************************\
313 * Macros to store results of instructions *
314 \***************************************************************************/
316 #define WRITEDEST(d) if (DESTReg==15) \
317 WriteR15(state, d) ; \
321 #define WRITESDEST(d) if (DESTReg == 15) \
322 WriteSR15(state, d) ; \
325 ARMul_NegZero(state, d) ; \
328 #define BYTETOBUS(data) ((data & 0xff) | \
329 ((data & 0xff) << 8) | \
330 ((data & 0xff) << 16) | \
331 ((data & 0xff) << 24))
332 #define BUSTOBYTE(address,data) \
333 if (state->bigendSig) \
334 temp = (data >> (((address ^ 3) & 3) << 3)) & 0xff ; \
336 temp = (data >> ((address & 3) << 3)) & 0xff
338 #define LOADMULT(instr,address,wb) LoadMult(state,instr,address,wb)
339 #define LOADSMULT(instr,address,wb) LoadSMult(state,instr,address,wb)
340 #define STOREMULT(instr,address,wb) StoreMult(state,instr,address,wb)
341 #define STORESMULT(instr,address,wb) StoreSMult(state,instr,address,wb)
343 #define POSBRANCH ((instr & 0x7fffff) << 2)
344 #define NEGBRANCH (0xff000000 | ((instr & 0xffffff) << 2))
346 /***************************************************************************\
347 * Values for Emulate *
348 \***************************************************************************/
350 #define STOP 0 /* stop */
351 #define CHANGEMODE 1 /* change mode */
352 #define ONCE 2 /* execute just one interation */
353 #define RUN 3 /* continuous execution */
355 /***************************************************************************\
356 * Stuff that is shared across modes *
357 \***************************************************************************/
359 extern ARMword ARMul_Emulate26(ARMul_State *state) ;
360 extern ARMword ARMul_Emulate32(ARMul_State *state) ;
361 extern unsigned ARMul_MultTable[] ; /* Number of I cycles for a mult */
362 extern ARMword ARMul_ImmedTable[] ; /* immediate DP LHS values */
363 extern char ARMul_BitList[] ; /* number of bits in a byte table */
364 extern void ARMul_Abort26(ARMul_State *state, ARMword) ;
365 extern void ARMul_Abort32(ARMul_State *state, ARMword) ;
366 extern unsigned ARMul_NthReg(ARMword instr,unsigned number) ;
367 extern void ARMul_MSRCpsr(ARMul_State *state, ARMword instr, ARMword rhs) ;
368 extern void ARMul_NegZero(ARMul_State *state, ARMword result) ;
369 extern void ARMul_AddCarry(ARMul_State *state, ARMword a, ARMword b, ARMword result) ;
370 extern void ARMul_AddOverflow(ARMul_State *state, ARMword a, ARMword b, ARMword result) ;
371 extern void ARMul_SubCarry(ARMul_State *state, ARMword a, ARMword b, ARMword result) ;
372 extern void ARMul_SubOverflow(ARMul_State *state, ARMword a, ARMword b, ARMword result) ;
373 extern void ARMul_CPSRAltered(ARMul_State *state) ;
374 extern void ARMul_R15Altered(ARMul_State *state) ;
375 extern ARMword ARMul_SwitchMode(ARMul_State *state,ARMword oldmode, ARMword newmode) ;
376 extern unsigned ARMul_NthReg(ARMword instr, unsigned number) ;
377 extern void ARMul_LDC(ARMul_State *state,ARMword instr,ARMword address) ;
378 extern void ARMul_STC(ARMul_State *state,ARMword instr,ARMword address) ;
379 extern void ARMul_MCR(ARMul_State *state,ARMword instr, ARMword source) ;
380 extern ARMword ARMul_MRC(ARMul_State *state,ARMword instr) ;
381 extern void ARMul_CDP(ARMul_State *state,ARMword instr) ;
382 extern unsigned IntPending(ARMul_State *state) ;
383 extern ARMword ARMul_Align(ARMul_State *state, ARMword address, ARMword data) ;
384 #define EVENTLISTSIZE 1024L
389 t_undefined, /* undefined Thumb instruction */
390 t_decoded, /* instruction decoded to ARM equivalent */
391 t_branch /* Thumb branch (already processed) */
394 extern tdstate ARMul_ThumbDecode(ARMul_State *state,ARMword pc,ARMword tinstr, ARMword *ainstr);
396 /***************************************************************************\
397 * Macros to scrutinize instructions *
398 \***************************************************************************/
405 #define UNDEF_MULPCDest
406 #define UNDEF_MULDestEQOp1
408 #define UNDEF_LSRBaseEQOffWb
409 #define UNDEF_LSRBaseEQDestWb
410 #define UNDEF_LSRPCBaseWb
411 #define UNDEF_LSRPCOffWb
412 #define UNDEF_LSMNoRegs
413 #define UNDEF_LSMPCBase
414 #define UNDEF_LSMUserBankWb
415 #define UNDEF_LSMBaseInListWb
417 #define UNDEF_CoProHS
419 #define UNDEF_LSCPCBaseWb
420 #define UNDEF_UndefNotBounced
421 #define UNDEF_ShortInt
422 #define UNDEF_IllegalMode
423 #define UNDEF_Prog32SigChange
424 #define UNDEF_Data32SigChange