binutils-gdb/sim/arm/arminit.c

311 lines
8.8 KiB
C

/* arminit.c -- ARMulator initialization: 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. */
#include "armdefs.h"
#include "armemu.h"
/***************************************************************************\
* Definitions for the emulator architecture *
\***************************************************************************/
void ARMul_EmulateInit (void);
ARMul_State *ARMul_NewState (void);
void ARMul_Reset (ARMul_State * state);
ARMword ARMul_DoCycle (ARMul_State * state);
unsigned ARMul_DoCoPro (ARMul_State * state);
ARMword ARMul_DoProg (ARMul_State * state);
ARMword ARMul_DoInstr (ARMul_State * state);
void ARMul_Abort (ARMul_State * state, ARMword address);
unsigned ARMul_MultTable[32] =
{ 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16, 16, 16
};
ARMword ARMul_ImmedTable[4096]; /* immediate DP LHS values */
char ARMul_BitList[256]; /* number of bits in a byte table */
/***************************************************************************\
* Call this routine once to set up the emulator's tables. *
\***************************************************************************/
void
ARMul_EmulateInit (void)
{
unsigned long i, j;
for (i = 0; i < 4096; i++)
{ /* the values of 12 bit dp rhs's */
ARMul_ImmedTable[i] = ROTATER (i & 0xffL, (i >> 7L) & 0x1eL);
}
for (i = 0; i < 256; ARMul_BitList[i++] = 0); /* how many bits in LSM */
for (j = 1; j < 256; j <<= 1)
for (i = 0; i < 256; i++)
if ((i & j) > 0)
ARMul_BitList[i]++;
for (i = 0; i < 256; i++)
ARMul_BitList[i] *= 4; /* you always need 4 times these values */
}
/***************************************************************************\
* Returns a new instantiation of the ARMulator's state *
\***************************************************************************/
ARMul_State *
ARMul_NewState (void)
{
ARMul_State *state;
unsigned i, j;
state = (ARMul_State *) malloc (sizeof (ARMul_State));
memset (state, 0, sizeof (ARMul_State));
state->Emulate = RUN;
for (i = 0; i < 16; i++)
{
state->Reg[i] = 0;
for (j = 0; j < 7; j++)
state->RegBank[j][i] = 0;
}
for (i = 0; i < 7; i++)
state->Spsr[i] = 0;
state->Mode = USER26MODE;
state->CallDebug = FALSE;
state->Debug = FALSE;
state->VectorCatch = 0;
state->Aborted = FALSE;
state->Reseted = FALSE;
state->Inted = 3;
state->LastInted = 3;
state->MemDataPtr = NULL;
state->MemInPtr = NULL;
state->MemOutPtr = NULL;
state->MemSparePtr = NULL;
state->MemSize = 0;
state->OSptr = NULL;
state->CommandLine = NULL;
state->EventSet = 0;
state->Now = 0;
state->EventPtr = (struct EventNode **) malloc ((unsigned) EVENTLISTSIZE *
sizeof (struct EventNode
*));
for (i = 0; i < EVENTLISTSIZE; i++)
*(state->EventPtr + i) = NULL;
#ifdef ARM61
state->prog32Sig = LOW;
state->data32Sig = LOW;
#else
state->prog32Sig = HIGH;
state->data32Sig = HIGH;
#endif
state->lateabtSig = LOW;
state->bigendSig = LOW;
state->is_v4 = LOW;
state->is_v5 = LOW;
ARMul_Reset (state);
return state;
}
/***************************************************************************\
Call this routine to set ARMulator to model certain processor properities
\***************************************************************************/
void
ARMul_SelectProcessor (ARMul_State * state, unsigned properties)
{
if (properties & ARM_Fix26_Prop)
{
state->prog32Sig = LOW;
state->data32Sig = LOW;
}
else
{
state->prog32Sig = HIGH;
state->data32Sig = HIGH;
}
state->lateabtSig = LOW;
state->is_v4 = (properties & (ARM_v4_Prop | ARM_v5_Prop)) ? HIGH : LOW;
state->is_v5 = (properties & ARM_v5_Prop) ? HIGH : LOW;
}
/***************************************************************************\
* Call this routine to set up the initial machine state (or perform a RESET *
\***************************************************************************/
void
ARMul_Reset (ARMul_State * state)
{
state->NextInstr = 0;
if (state->prog32Sig)
{
state->Reg[15] = 0;
state->Cpsr = INTBITS | SVC32MODE;
state->Mode = SVC32MODE;
}
else
{
state->Reg[15] = R15INTBITS | SVC26MODE;
state->Cpsr = INTBITS | SVC26MODE;
state->Mode = SVC26MODE;
}
ARMul_CPSRAltered (state);
state->Bank = SVCBANK;
FLUSHPIPE;
state->EndCondition = 0;
state->ErrorCode = 0;
state->Exception = FALSE;
state->NresetSig = HIGH;
state->NfiqSig = HIGH;
state->NirqSig = HIGH;
state->NtransSig = (state->Mode & 3) ? HIGH : LOW;
state->abortSig = LOW;
state->AbortAddr = 1;
state->NumInstrs = 0;
state->NumNcycles = 0;
state->NumScycles = 0;
state->NumIcycles = 0;
state->NumCcycles = 0;
state->NumFcycles = 0;
#ifdef ASIM
(void) ARMul_MemoryInit ();
ARMul_OSInit (state);
#endif
}
/***************************************************************************\
* Emulate the execution of an entire program. Start the correct emulator *
* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
* address of the last instruction that is executed. *
\***************************************************************************/
ARMword
ARMul_DoProg (ARMul_State * state)
{
ARMword pc = 0;
state->Emulate = RUN;
while (state->Emulate != STOP)
{
state->Emulate = RUN;
if (state->prog32Sig && ARMul_MODE32BIT)
pc = ARMul_Emulate32 (state);
else
pc = ARMul_Emulate26 (state);
}
return (pc);
}
/***************************************************************************\
* Emulate the execution of one instruction. Start the correct emulator *
* (Emulate26 for a 26 bit ARM and Emulate32 for a 32 bit ARM), return the *
* address of the instruction that is executed. *
\***************************************************************************/
ARMword
ARMul_DoInstr (ARMul_State * state)
{
ARMword pc = 0;
state->Emulate = ONCE;
if (state->prog32Sig && ARMul_MODE32BIT)
pc = ARMul_Emulate32 (state);
else
pc = ARMul_Emulate26 (state);
return (pc);
}
/***************************************************************************\
* This routine causes an Abort to occur, including selecting the correct *
* mode, register bank, and the saving of registers. Call with the *
* appropriate vector's memory address (0,4,8 ....) *
\***************************************************************************/
void
ARMul_Abort (ARMul_State * state, ARMword vector)
{
ARMword temp;
int isize = INSN_SIZE;
state->Aborted = FALSE;
if (ARMul_OSException (state, vector, ARMul_GetPC (state)))
return;
if (state->prog32Sig)
if (ARMul_MODE26BIT)
temp = R15PC;
else
temp = state->Reg[15];
else
temp = R15PC | ECC | ER15INT | EMODE;
switch (vector)
{
case ARMul_ResetV: /* RESET */
SETABORT (INTBITS, state->prog32Sig ? SVC32MODE : SVC26MODE, 0);
break;
case ARMul_UndefinedInstrV: /* Undefined Instruction */
SETABORT (IBIT, state->prog32Sig ? UNDEF32MODE : SVC26MODE, isize);
break;
case ARMul_SWIV: /* Software Interrupt */
SETABORT (IBIT, state->prog32Sig ? SVC32MODE : SVC26MODE, isize);
break;
case ARMul_PrefetchAbortV: /* Prefetch Abort */
state->AbortAddr = 1;
SETABORT (IBIT, state->prog32Sig ? ABORT32MODE : SVC26MODE, isize);
break;
case ARMul_DataAbortV: /* Data Abort */
SETABORT (IBIT, state->prog32Sig ? ABORT32MODE : SVC26MODE, isize);
break;
case ARMul_AddrExceptnV: /* Address Exception */
SETABORT (IBIT, SVC26MODE, isize);
break;
case ARMul_IRQV: /* IRQ */
SETABORT (IBIT, state->prog32Sig ? IRQ32MODE : IRQ26MODE, isize);
break;
case ARMul_FIQV: /* FIQ */
SETABORT (INTBITS, state->prog32Sig ? FIQ32MODE : FIQ26MODE, isize);
break;
}
if (ARMul_MODE32BIT)
ARMul_SetR15 (state, vector);
else
ARMul_SetR15 (state, R15CCINTMODE | vector);
}