320 lines
9.4 KiB
C
320 lines
9.4 KiB
C
/* arminit.c -- ARMulator initialization: ARM6 Instruction Emulator.
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Copyright (C) 1994 Advanced RISC Machines Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "armdefs.h"
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#include "armemu.h"
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/***************************************************************************\
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* Definitions for the emulator architecture *
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\***************************************************************************/
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void ARMul_EmulateInit (void);
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ARMul_State *ARMul_NewState (void);
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void ARMul_Reset (ARMul_State * state);
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ARMword ARMul_DoCycle (ARMul_State * state);
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unsigned ARMul_DoCoPro (ARMul_State * state);
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ARMword ARMul_DoProg (ARMul_State * state);
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ARMword ARMul_DoInstr (ARMul_State * state);
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void ARMul_Abort (ARMul_State * state, ARMword address);
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unsigned ARMul_MultTable[32] =
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{ 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
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10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 16
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};
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ARMword ARMul_ImmedTable[4096]; /* immediate DP LHS values */
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char ARMul_BitList[256]; /* number of bits in a byte table */
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/***************************************************************************\
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* Call this routine once to set up the emulator's tables. *
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\***************************************************************************/
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void
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ARMul_EmulateInit (void)
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{
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unsigned long i, j;
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for (i = 0; i < 4096; i++)
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{ /* the values of 12 bit dp rhs's */
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ARMul_ImmedTable[i] = ROTATER (i & 0xffL, (i >> 7L) & 0x1eL);
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}
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for (i = 0; i < 256; ARMul_BitList[i++] = 0); /* how many bits in LSM */
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for (j = 1; j < 256; j <<= 1)
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for (i = 0; i < 256; i++)
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if ((i & j) > 0)
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ARMul_BitList[i]++;
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for (i = 0; i < 256; i++)
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ARMul_BitList[i] *= 4; /* you always need 4 times these values */
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}
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/***************************************************************************\
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* Returns a new instantiation of the ARMulator's state *
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\***************************************************************************/
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ARMul_State *
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ARMul_NewState (void)
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{
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ARMul_State *state;
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unsigned i, j;
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state = (ARMul_State *) malloc (sizeof (ARMul_State));
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memset (state, 0, sizeof (ARMul_State));
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state->Emulate = RUN;
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for (i = 0; i < 16; i++)
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{
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state->Reg[i] = 0;
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for (j = 0; j < 7; j++)
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state->RegBank[j][i] = 0;
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}
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for (i = 0; i < 7; i++)
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state->Spsr[i] = 0;
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state->Mode = 0;
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state->CallDebug = FALSE;
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state->Debug = FALSE;
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state->VectorCatch = 0;
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state->Aborted = FALSE;
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state->Reseted = FALSE;
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state->Inted = 3;
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state->LastInted = 3;
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state->MemDataPtr = NULL;
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state->MemInPtr = NULL;
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state->MemOutPtr = NULL;
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state->MemSparePtr = NULL;
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state->MemSize = 0;
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state->OSptr = NULL;
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state->CommandLine = NULL;
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state->EventSet = 0;
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state->Now = 0;
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state->EventPtr = (struct EventNode **) malloc ((unsigned) EVENTLISTSIZE *
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sizeof (struct EventNode
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*));
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for (i = 0; i < EVENTLISTSIZE; i++)
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*(state->EventPtr + i) = NULL;
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#ifdef ARM61
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state->prog32Sig = LOW;
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state->data32Sig = LOW;
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#else
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state->prog32Sig = HIGH;
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state->data32Sig = HIGH;
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#endif
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state->lateabtSig = LOW;
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state->bigendSig = LOW;
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ARMul_Reset (state);
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return (state);
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}
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/***************************************************************************\
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* Call this routine to set ARMulator to model a certain processor *
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\***************************************************************************/
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void
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ARMul_SelectProcessor (ARMul_State * state, unsigned processor)
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{
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if (processor & ARM_Fix26_Prop)
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{
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state->prog32Sig = LOW;
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state->data32Sig = LOW;
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}
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else
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{
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state->prog32Sig = HIGH;
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state->data32Sig = HIGH;
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}
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state->lateabtSig = LOW;
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}
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/***************************************************************************\
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* Call this routine to set up the initial machine state (or perform a RESET *
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\***************************************************************************/
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void
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ARMul_Reset (ARMul_State * state)
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{
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state->NextInstr = 0;
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if (state->prog32Sig)
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{
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state->Reg[15] = 0;
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state->Cpsr = INTBITS | SVC32MODE;
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}
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else
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{
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state->Reg[15] = R15INTBITS | SVC26MODE;
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state->Cpsr = INTBITS | SVC26MODE;
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}
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ARMul_CPSRAltered (state);
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state->Bank = SVCBANK;
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FLUSHPIPE;
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state->EndCondition = 0;
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state->ErrorCode = 0;
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state->Exception = FALSE;
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state->NresetSig = HIGH;
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state->NfiqSig = HIGH;
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state->NirqSig = HIGH;
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state->NtransSig = (state->Mode & 3) ? HIGH : LOW;
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state->abortSig = LOW;
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state->AbortAddr = 1;
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state->NumInstrs = 0;
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state->NumNcycles = 0;
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state->NumScycles = 0;
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state->NumIcycles = 0;
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state->NumCcycles = 0;
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state->NumFcycles = 0;
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#ifdef ASIM
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(void) ARMul_MemoryInit ();
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ARMul_OSInit (state);
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#endif
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}
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/***************************************************************************\
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* Emulate the execution of an entire program. Start the correct emulator *
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* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
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* address of the last instruction that is executed. *
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\***************************************************************************/
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ARMword
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ARMul_DoProg (ARMul_State * state)
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{
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ARMword pc = 0;
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state->Emulate = RUN;
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while (state->Emulate != STOP)
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{
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state->Emulate = RUN;
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if (state->prog32Sig && ARMul_MODE32BIT)
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pc = ARMul_Emulate32 (state);
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else
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pc = ARMul_Emulate26 (state);
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}
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return (pc);
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}
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/***************************************************************************\
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* Emulate the execution of one instruction. Start the correct emulator *
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* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
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* address of the instruction that is executed. *
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\***************************************************************************/
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ARMword
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ARMul_DoInstr (ARMul_State * state)
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{
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ARMword pc = 0;
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state->Emulate = ONCE;
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if (state->prog32Sig && ARMul_MODE32BIT)
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pc = ARMul_Emulate32 (state);
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else
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pc = ARMul_Emulate26 (state);
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return (pc);
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}
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/***************************************************************************\
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* This routine causes an Abort to occur, including selecting the correct *
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* mode, register bank, and the saving of registers. Call with the *
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* appropriate vector's memory address (0,4,8 ....) *
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\***************************************************************************/
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void
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ARMul_Abort (ARMul_State * state, ARMword vector)
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{
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ARMword temp;
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state->Aborted = FALSE;
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if (ARMul_OSException (state, vector, ARMul_GetPC (state)))
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return;
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if (state->prog32Sig)
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if (ARMul_MODE26BIT)
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temp = R15PC;
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else
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temp = state->Reg[15];
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else
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temp = R15PC | ECC | ER15INT | EMODE;
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switch (vector)
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{
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case ARMul_ResetV: /* RESET */
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state->Spsr[SVCBANK] = CPSR;
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SETABORT (INTBITS, state->prog32Sig ? SVC32MODE : SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp;
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break;
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case ARMul_UndefinedInstrV: /* Undefined Instruction */
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state->Spsr[state->prog32Sig ? UNDEFBANK : SVCBANK] = CPSR;
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SETABORT (IBIT, state->prog32Sig ? UNDEF32MODE : SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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case ARMul_SWIV: /* Software Interrupt */
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state->Spsr[SVCBANK] = CPSR;
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SETABORT (IBIT, state->prog32Sig ? SVC32MODE : SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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case ARMul_PrefetchAbortV: /* Prefetch Abort */
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state->AbortAddr = 1;
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state->Spsr[state->prog32Sig ? ABORTBANK : SVCBANK] = CPSR;
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SETABORT (IBIT, state->prog32Sig ? ABORT32MODE : SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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case ARMul_DataAbortV: /* Data Abort */
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state->Spsr[state->prog32Sig ? ABORTBANK : SVCBANK] = CPSR;
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SETABORT (IBIT, state->prog32Sig ? ABORT32MODE : SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4; /* the PC must have been incremented */
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break;
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case ARMul_AddrExceptnV: /* Address Exception */
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state->Spsr[SVCBANK] = CPSR;
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SETABORT (IBIT, SVC26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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case ARMul_IRQV: /* IRQ */
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state->Spsr[IRQBANK] = CPSR;
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SETABORT (IBIT, state->prog32Sig ? IRQ32MODE : IRQ26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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case ARMul_FIQV: /* FIQ */
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state->Spsr[FIQBANK] = CPSR;
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SETABORT (INTBITS, state->prog32Sig ? FIQ32MODE : FIQ26MODE);
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ARMul_CPSRAltered (state);
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state->Reg[14] = temp - 4;
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break;
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}
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if (ARMul_MODE32BIT)
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ARMul_SetR15 (state, vector);
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else
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ARMul_SetR15 (state, R15CCINTMODE | vector);
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}
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