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Diffstat (limited to 'sim/arm/armsupp.c')
| -rw-r--r-- | sim/arm/armsupp.c | 821 |
1 files changed, 0 insertions, 821 deletions
diff --git a/sim/arm/armsupp.c b/sim/arm/armsupp.c deleted file mode 100644 index b8e1d38..0000000 --- a/sim/arm/armsupp.c +++ /dev/null @@ -1,821 +0,0 @@ -/* armsupp.c -- ARMulator support code: 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ - -#include "armdefs.h" -#include "armemu.h" -#include "ansidecl.h" - -/* Definitions for the support routines. */ - -static ARMword ModeToBank (ARMword); -static void EnvokeList (ARMul_State *, unsigned long, unsigned long); - -struct EventNode -{ /* An event list node. */ - unsigned (*func) (ARMul_State *); /* The function to call. */ - struct EventNode *next; -}; - -/* This routine returns the value of a register from a mode. */ - -ARMword -ARMul_GetReg (ARMul_State * state, unsigned mode, unsigned reg) -{ - mode &= MODEBITS; - if (mode != state->Mode) - return (state->RegBank[ModeToBank ((ARMword) mode)][reg]); - else - return (state->Reg[reg]); -} - -/* This routine sets the value of a register for a mode. */ - -void -ARMul_SetReg (ARMul_State * state, unsigned mode, unsigned reg, ARMword value) -{ - mode &= MODEBITS; - if (mode != state->Mode) - state->RegBank[ModeToBank ((ARMword) mode)][reg] = value; - else - state->Reg[reg] = value; -} - -/* This routine returns the value of the PC, mode independently. */ - -ARMword -ARMul_GetPC (ARMul_State * state) -{ - if (state->Mode > SVC26MODE) - return state->Reg[15]; - else - return R15PC; -} - -/* This routine returns the value of the PC, mode independently. */ - -ARMword -ARMul_GetNextPC (ARMul_State * state) -{ - if (state->Mode > SVC26MODE) - return state->Reg[15] + isize; - else - return (state->Reg[15] + isize) & R15PCBITS; -} - -/* This routine sets the value of the PC. */ - -void -ARMul_SetPC (ARMul_State * state, ARMword value) -{ - if (ARMul_MODE32BIT) - state->Reg[15] = value & PCBITS; - else - state->Reg[15] = R15CCINTMODE | (value & R15PCBITS); - FLUSHPIPE; -} - -/* This routine returns the value of register 15, mode independently. */ - -ARMword -ARMul_GetR15 (ARMul_State * state) -{ - if (state->Mode > SVC26MODE) - return (state->Reg[15]); - else - return (R15PC | ECC | ER15INT | EMODE); -} - -/* This routine sets the value of Register 15. */ - -void -ARMul_SetR15 (ARMul_State * state, ARMword value) -{ - if (ARMul_MODE32BIT) - state->Reg[15] = value & PCBITS; - else - { - state->Reg[15] = value; - ARMul_R15Altered (state); - } - FLUSHPIPE; -} - -/* This routine returns the value of the CPSR. */ - -ARMword -ARMul_GetCPSR (ARMul_State * state) -{ - return (CPSR | state->Cpsr); -} - -/* This routine sets the value of the CPSR. */ - -void -ARMul_SetCPSR (ARMul_State * state, ARMword value) -{ - state->Cpsr = value; - ARMul_CPSRAltered (state); -} - -/* This routine does all the nasty bits involved in a write to the CPSR, - including updating the register bank, given a MSR instruction. */ - -void -ARMul_FixCPSR (ARMul_State * state, ARMword instr, ARMword rhs) -{ - state->Cpsr = ARMul_GetCPSR (state); - - if (state->Mode != USER26MODE - && state->Mode != USER32MODE) - { - /* In user mode, only write flags. */ - if (BIT (16)) - SETPSR_C (state->Cpsr, rhs); - if (BIT (17)) - SETPSR_X (state->Cpsr, rhs); - if (BIT (18)) - SETPSR_S (state->Cpsr, rhs); - } - if (BIT (19)) - SETPSR_F (state->Cpsr, rhs); - ARMul_CPSRAltered (state); -} - -/* Get an SPSR from the specified mode. */ - -ARMword -ARMul_GetSPSR (ARMul_State * state, ARMword mode) -{ - ARMword bank = ModeToBank (mode & MODEBITS); - - if (! BANK_CAN_ACCESS_SPSR (bank)) - return ARMul_GetCPSR (state); - - return state->Spsr[bank]; -} - -/* This routine does a write to an SPSR. */ - -void -ARMul_SetSPSR (ARMul_State * state, ARMword mode, ARMword value) -{ - ARMword bank = ModeToBank (mode & MODEBITS); - - if (BANK_CAN_ACCESS_SPSR (bank)) - state->Spsr[bank] = value; -} - -/* This routine does a write to the current SPSR, given an MSR instruction. */ - -void -ARMul_FixSPSR (ARMul_State * state, ARMword instr, ARMword rhs) -{ - if (BANK_CAN_ACCESS_SPSR (state->Bank)) - { - if (BIT (16)) - SETPSR_C (state->Spsr[state->Bank], rhs); - if (BIT (17)) - SETPSR_X (state->Spsr[state->Bank], rhs); - if (BIT (18)) - SETPSR_S (state->Spsr[state->Bank], rhs); - if (BIT (19)) - SETPSR_F (state->Spsr[state->Bank], rhs); - } -} - -/* This routine updates the state of the emulator after the Cpsr has been - changed. Both the processor flags and register bank are updated. */ - -void -ARMul_CPSRAltered (ARMul_State * state) -{ - ARMword oldmode; - - if (state->prog32Sig == LOW) - state->Cpsr &= (CCBITS | INTBITS | R15MODEBITS); - - oldmode = state->Mode; - - if (state->Mode != (state->Cpsr & MODEBITS)) - { - state->Mode = - ARMul_SwitchMode (state, state->Mode, state->Cpsr & MODEBITS); - - state->NtransSig = (state->Mode & 3) ? HIGH : LOW; - } - state->Cpsr &= ~MODEBITS; - - ASSIGNINT (state->Cpsr & INTBITS); - state->Cpsr &= ~INTBITS; - ASSIGNN ((state->Cpsr & NBIT) != 0); - state->Cpsr &= ~NBIT; - ASSIGNZ ((state->Cpsr & ZBIT) != 0); - state->Cpsr &= ~ZBIT; - ASSIGNC ((state->Cpsr & CBIT) != 0); - state->Cpsr &= ~CBIT; - ASSIGNV ((state->Cpsr & VBIT) != 0); - state->Cpsr &= ~VBIT; - ASSIGNS ((state->Cpsr & SBIT) != 0); - state->Cpsr &= ~SBIT; -#ifdef MODET - ASSIGNT ((state->Cpsr & TBIT) != 0); - state->Cpsr &= ~TBIT; -#endif - - if (oldmode > SVC26MODE) - { - if (state->Mode <= SVC26MODE) - { - state->Emulate = CHANGEMODE; - state->Reg[15] = ECC | ER15INT | EMODE | R15PC; - } - } - else - { - if (state->Mode > SVC26MODE) - { - state->Emulate = CHANGEMODE; - state->Reg[15] = R15PC; - } - else - state->Reg[15] = ECC | ER15INT | EMODE | R15PC; - } -} - -/* This routine updates the state of the emulator after register 15 has - been changed. Both the processor flags and register bank are updated. - This routine should only be called from a 26 bit mode. */ - -void -ARMul_R15Altered (ARMul_State * state) -{ - if (state->Mode != R15MODE) - { - state->Mode = ARMul_SwitchMode (state, state->Mode, R15MODE); - state->NtransSig = (state->Mode & 3) ? HIGH : LOW; - } - - if (state->Mode > SVC26MODE) - state->Emulate = CHANGEMODE; - - ASSIGNR15INT (R15INT); - - ASSIGNN ((state->Reg[15] & NBIT) != 0); - ASSIGNZ ((state->Reg[15] & ZBIT) != 0); - ASSIGNC ((state->Reg[15] & CBIT) != 0); - ASSIGNV ((state->Reg[15] & VBIT) != 0); -} - -/* This routine controls the saving and restoring of registers across mode - changes. The regbank matrix is largely unused, only rows 13 and 14 are - used across all modes, 8 to 14 are used for FIQ, all others use the USER - column. It's easier this way. old and new parameter are modes numbers. - Notice the side effect of changing the Bank variable. */ - -ARMword -ARMul_SwitchMode (ARMul_State * state, ARMword oldmode, ARMword newmode) -{ - unsigned i; - ARMword oldbank; - ARMword newbank; - - oldbank = ModeToBank (oldmode); - newbank = state->Bank = ModeToBank (newmode); - - /* Do we really need to do it? */ - if (oldbank != newbank) - { - /* Save away the old registers. */ - switch (oldbank) - { - case USERBANK: - case IRQBANK: - case SVCBANK: - case ABORTBANK: - case UNDEFBANK: - if (newbank == FIQBANK) - for (i = 8; i < 13; i++) - state->RegBank[USERBANK][i] = state->Reg[i]; - state->RegBank[oldbank][13] = state->Reg[13]; - state->RegBank[oldbank][14] = state->Reg[14]; - break; - case FIQBANK: - for (i = 8; i < 15; i++) - state->RegBank[FIQBANK][i] = state->Reg[i]; - break; - case DUMMYBANK: - for (i = 8; i < 15; i++) - state->RegBank[DUMMYBANK][i] = 0; - break; - default: - abort (); - } - - /* Restore the new registers. */ - switch (newbank) - { - case USERBANK: - case IRQBANK: - case SVCBANK: - case ABORTBANK: - case UNDEFBANK: - if (oldbank == FIQBANK) - for (i = 8; i < 13; i++) - state->Reg[i] = state->RegBank[USERBANK][i]; - state->Reg[13] = state->RegBank[newbank][13]; - state->Reg[14] = state->RegBank[newbank][14]; - break; - case FIQBANK: - for (i = 8; i < 15; i++) - state->Reg[i] = state->RegBank[FIQBANK][i]; - break; - case DUMMYBANK: - for (i = 8; i < 15; i++) - state->Reg[i] = 0; - break; - default: - abort (); - } - } - - return newmode; -} - -/* Given a processor mode, this routine returns the - register bank that will be accessed in that mode. */ - -static ARMword -ModeToBank (ARMword mode) -{ - static ARMword bankofmode[] = - { - USERBANK, FIQBANK, IRQBANK, SVCBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, DUMMYBANK, - USERBANK, FIQBANK, IRQBANK, SVCBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, ABORTBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, UNDEFBANK, - DUMMYBANK, DUMMYBANK, DUMMYBANK, SYSTEMBANK - }; - - if (mode >= (sizeof (bankofmode) / sizeof (bankofmode[0]))) - return DUMMYBANK; - - return bankofmode[mode]; -} - -/* Returns the register number of the nth register in a reg list. */ - -unsigned -ARMul_NthReg (ARMword instr, unsigned number) -{ - unsigned bit, upto; - - for (bit = 0, upto = 0; upto <= number; bit ++) - if (BIT (bit)) - upto ++; - - return (bit - 1); -} - -/* Assigns the N and Z flags depending on the value of result. */ - -void -ARMul_NegZero (ARMul_State * state, ARMword result) -{ - if (NEG (result)) - { - SETN; - CLEARZ; - } - else if (result == 0) - { - CLEARN; - SETZ; - } - else - { - CLEARN; - CLEARZ; - } -} - -/* Compute whether an addition of A and B, giving RESULT, overflowed. */ - -int -AddOverflow (ARMword a, ARMword b, ARMword result) -{ - return ((NEG (a) && NEG (b) && POS (result)) - || (POS (a) && POS (b) && NEG (result))); -} - -/* Compute whether a subtraction of A and B, giving RESULT, overflowed. */ - -int -SubOverflow (ARMword a, ARMword b, ARMword result) -{ - return ((NEG (a) && POS (b) && POS (result)) - || (POS (a) && NEG (b) && NEG (result))); -} - -/* Assigns the C flag after an addition of a and b to give result. */ - -void -ARMul_AddCarry (ARMul_State * state, ARMword a, ARMword b, ARMword result) -{ - ASSIGNC ((NEG (a) && NEG (b)) || - (NEG (a) && POS (result)) || (NEG (b) && POS (result))); -} - -/* Assigns the V flag after an addition of a and b to give result. */ - -void -ARMul_AddOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result) -{ - ASSIGNV (AddOverflow (a, b, result)); -} - -/* Assigns the C flag after an subtraction of a and b to give result. */ - -void -ARMul_SubCarry (ARMul_State * state, ARMword a, ARMword b, ARMword result) -{ - ASSIGNC ((NEG (a) && POS (b)) || - (NEG (a) && POS (result)) || (POS (b) && POS (result))); -} - -/* Assigns the V flag after an subtraction of a and b to give result. */ - -void -ARMul_SubOverflow (ARMul_State * state, ARMword a, ARMword b, ARMword result) -{ - ASSIGNV (SubOverflow (a, b, result)); -} - -/* This function does the work of generating the addresses used in an - LDC instruction. The code here is always post-indexed, it's up to the - caller to get the input address correct and to handle base register - modification. It also handles the Busy-Waiting. */ - -void -ARMul_LDC (ARMul_State * state, ARMword instr, ARMword address) -{ - unsigned cpab; - ARMword data; - - UNDEF_LSCPCBaseWb; - - if (! CP_ACCESS_ALLOWED (state, CPNum)) - { - ARMul_UndefInstr (state, instr); - return; - } - - if (ADDREXCEPT (address)) - INTERNALABORT (address); - - cpab = (state->LDC[CPNum]) (state, ARMul_FIRST, instr, 0); - while (cpab == ARMul_BUSY) - { - ARMul_Icycles (state, 1, 0); - - if (IntPending (state)) - { - cpab = (state->LDC[CPNum]) (state, ARMul_INTERRUPT, instr, 0); - return; - } - else - cpab = (state->LDC[CPNum]) (state, ARMul_BUSY, instr, 0); - } - if (cpab == ARMul_CANT) - { - CPTAKEABORT; - return; - } - - cpab = (state->LDC[CPNum]) (state, ARMul_TRANSFER, instr, 0); - data = ARMul_LoadWordN (state, address); - BUSUSEDINCPCN; - - if (BIT (21)) - LSBase = state->Base; - cpab = (state->LDC[CPNum]) (state, ARMul_DATA, instr, data); - - while (cpab == ARMul_INC) - { - address += 4; - data = ARMul_LoadWordN (state, address); - cpab = (state->LDC[CPNum]) (state, ARMul_DATA, instr, data); - } - - if (state->abortSig || state->Aborted) - TAKEABORT; -} - -/* This function does the work of generating the addresses used in an - STC instruction. The code here is always post-indexed, it's up to the - caller to get the input address correct and to handle base register - modification. It also handles the Busy-Waiting. */ - -void -ARMul_STC (ARMul_State * state, ARMword instr, ARMword address) -{ - unsigned cpab; - ARMword data; - - UNDEF_LSCPCBaseWb; - - if (! CP_ACCESS_ALLOWED (state, CPNum)) - { - ARMul_UndefInstr (state, instr); - return; - } - - if (ADDREXCEPT (address) || VECTORACCESS (address)) - INTERNALABORT (address); - - cpab = (state->STC[CPNum]) (state, ARMul_FIRST, instr, &data); - while (cpab == ARMul_BUSY) - { - ARMul_Icycles (state, 1, 0); - if (IntPending (state)) - { - cpab = (state->STC[CPNum]) (state, ARMul_INTERRUPT, instr, 0); - return; - } - else - cpab = (state->STC[CPNum]) (state, ARMul_BUSY, instr, &data); - } - - if (cpab == ARMul_CANT) - { - CPTAKEABORT; - return; - } -#ifndef MODE32 - if (ADDREXCEPT (address) || VECTORACCESS (address)) - INTERNALABORT (address); -#endif - BUSUSEDINCPCN; - if (BIT (21)) - LSBase = state->Base; - cpab = (state->STC[CPNum]) (state, ARMul_DATA, instr, &data); - ARMul_StoreWordN (state, address, data); - - while (cpab == ARMul_INC) - { - address += 4; - cpab = (state->STC[CPNum]) (state, ARMul_DATA, instr, &data); - ARMul_StoreWordN (state, address, data); - } - - if (state->abortSig || state->Aborted) - TAKEABORT; -} - -/* This function does the Busy-Waiting for an MCR instruction. */ - -void -ARMul_MCR (ARMul_State * state, ARMword instr, ARMword source) -{ - unsigned cpab; - - if (! CP_ACCESS_ALLOWED (state, CPNum)) - { - ARMul_UndefInstr (state, instr); - return; - } - - cpab = (state->MCR[CPNum]) (state, ARMul_FIRST, instr, source); - - while (cpab == ARMul_BUSY) - { - ARMul_Icycles (state, 1, 0); - - if (IntPending (state)) - { - cpab = (state->MCR[CPNum]) (state, ARMul_INTERRUPT, instr, 0); - return; - } - else - cpab = (state->MCR[CPNum]) (state, ARMul_BUSY, instr, source); - } - - if (cpab == ARMul_CANT) - ARMul_Abort (state, ARMul_UndefinedInstrV); - else - { - BUSUSEDINCPCN; - ARMul_Ccycles (state, 1, 0); - } -} - -/* This function does the Busy-Waiting for an MRC instruction. */ - -ARMword -ARMul_MRC (ARMul_State * state, ARMword instr) -{ - unsigned cpab; - ARMword result = 0; - - if (! CP_ACCESS_ALLOWED (state, CPNum)) - { - ARMul_UndefInstr (state, instr); - return; - } - - cpab = (state->MRC[CPNum]) (state, ARMul_FIRST, instr, &result); - while (cpab == ARMul_BUSY) - { - ARMul_Icycles (state, 1, 0); - if (IntPending (state)) - { - cpab = (state->MRC[CPNum]) (state, ARMul_INTERRUPT, instr, 0); - return (0); - } - else - cpab = (state->MRC[CPNum]) (state, ARMul_BUSY, instr, &result); - } - if (cpab == ARMul_CANT) - { - ARMul_Abort (state, ARMul_UndefinedInstrV); - /* Parent will destroy the flags otherwise. */ - result = ECC; - } - else - { - BUSUSEDINCPCN; - ARMul_Ccycles (state, 1, 0); - ARMul_Icycles (state, 1, 0); - } - - return result; -} - -/* This function does the Busy-Waiting for an CDP instruction. */ - -void -ARMul_CDP (ARMul_State * state, ARMword instr) -{ - unsigned cpab; - - if (! CP_ACCESS_ALLOWED (state, CPNum)) - { - ARMul_UndefInstr (state, instr); - return; - } - - cpab = (state->CDP[CPNum]) (state, ARMul_FIRST, instr); - while (cpab == ARMul_BUSY) - { - ARMul_Icycles (state, 1, 0); - if (IntPending (state)) - { - cpab = (state->CDP[CPNum]) (state, ARMul_INTERRUPT, instr); - return; - } - else - cpab = (state->CDP[CPNum]) (state, ARMul_BUSY, instr); - } - if (cpab == ARMul_CANT) - ARMul_Abort (state, ARMul_UndefinedInstrV); - else - BUSUSEDN; -} - -/* This function handles Undefined instructions, as CP isntruction. */ - -void -ARMul_UndefInstr (ARMul_State * state, ARMword instr ATTRIBUTE_UNUSED) -{ - ARMul_Abort (state, ARMul_UndefinedInstrV); -} - -/* Return TRUE if an interrupt is pending, FALSE otherwise. */ - -unsigned -IntPending (ARMul_State * state) -{ - if (state->Exception) - { - /* Any exceptions. */ - if (state->NresetSig == LOW) - { - ARMul_Abort (state, ARMul_ResetV); - return TRUE; - } - else if (!state->NfiqSig && !FFLAG) - { - ARMul_Abort (state, ARMul_FIQV); - return TRUE; - } - else if (!state->NirqSig && !IFLAG) - { - ARMul_Abort (state, ARMul_IRQV); - return TRUE; - } - } - - return FALSE; -} - -/* Align a word access to a non word boundary. */ - -ARMword -ARMul_Align (state, address, data) - ARMul_State * state ATTRIBUTE_UNUSED; - ARMword address; - ARMword data; -{ - /* This code assumes the address is really unaligned, - as a shift by 32 is undefined in C. */ - - address = (address & 3) << 3; /* Get the word address. */ - return ((data >> address) | (data << (32 - address))); /* rot right */ -} - -/* This routine is used to call another routine after a certain number of - cycles have been executed. The first parameter is the number of cycles - delay before the function is called, the second argument is a pointer - to the function. A delay of zero doesn't work, just call the function. */ - -void -ARMul_ScheduleEvent (ARMul_State * state, unsigned long delay, - unsigned (*what) (ARMul_State *)) -{ - unsigned long when; - struct EventNode *event; - - if (state->EventSet++ == 0) - state->Now = ARMul_Time (state); - when = (state->Now + delay) % EVENTLISTSIZE; - event = (struct EventNode *) malloc (sizeof (struct EventNode)); - event->func = what; - event->next = *(state->EventPtr + when); - *(state->EventPtr + when) = event; -} - -/* This routine is called at the beginning of - every cycle, to envoke scheduled events. */ - -void -ARMul_EnvokeEvent (ARMul_State * state) -{ - static unsigned long then; - - then = state->Now; - state->Now = ARMul_Time (state) % EVENTLISTSIZE; - if (then < state->Now) - /* Schedule events. */ - EnvokeList (state, then, state->Now); - else if (then > state->Now) - { - /* Need to wrap around the list. */ - EnvokeList (state, then, EVENTLISTSIZE - 1L); - EnvokeList (state, 0L, state->Now); - } -} - -/* Envokes all the entries in a range. */ - -static void -EnvokeList (ARMul_State * state, unsigned long from, unsigned long to) -{ - for (; from <= to; from++) - { - struct EventNode *anevent; - - anevent = *(state->EventPtr + from); - while (anevent) - { - (anevent->func) (state); - state->EventSet--; - anevent = anevent->next; - } - *(state->EventPtr + from) = NULL; - } -} - -/* This routine is returns the number of clock ticks since the last reset. */ - -unsigned long -ARMul_Time (ARMul_State * state) -{ - return (state->NumScycles + state->NumNcycles + - state->NumIcycles + state->NumCcycles + state->NumFcycles); -} |