armvirt.c

这是Skyeye 0.9 版本的源代码

/*  armvirt.c -- ARMulator virtual memory interace:  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. */

/* This file contains a complete ARMulator memory model, modelling a
"virtual memory" system. A much simpler model can be found in armfast.c,
and that model goes faster too, but has a fixed amount of memory. This
model's memory has 64K pages, allocated on demand from a 64K entry page
table. The routines PutWord and GetWord implement this. Pages are never
freed as they might be needed again. A single area of memory may be
defined to generate aborts. */

//chy 2005-09-12 disable the nouse armopts.h
//#include "armopts.h"
#include "armdefs.h"
#include "ansidecl.h"

#ifdef VALIDATE			/* for running the validate suite */
#define TUBE 48 * 1024 * 1024	/* write a char on the screen */
#define ABORTS 1
#endif

/* #define ABORTS */

#ifdef ABORTS			/* the memory system will abort */
/* For the old test suite Abort between 32 Kbytes and 32 Mbytes
   For the new test suite Abort between 8 Mbytes and 26 Mbytes */
/* #define LOWABORT 32 * 1024
#define HIGHABORT 32 * 1024 * 1024 */
#define LOWABORT 8 * 1024 * 1024
#define HIGHABORT 26 * 1024 * 1024

#endif

#define NUMPAGES 64 * 1024
#define PAGESIZE 64 * 1024
#define PAGEBITS 16
#define OFFSETBITS 0xffff
//chy 2003-08-19: seems no use ????
int SWI_vector_installed = FALSE;
extern ARMword skyeye_cachetype;

/***************************************************************************\
*        Get a byte into Virtual Memory, maybe allocating the page          *
\***************************************************************************/
static fault_t
GetByte (ARMul_State * state, ARMword address, ARMword * data)
{
  fault_t fault;

  fault = mmu_read_byte (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
//              printf("SKYEYE: GetByte fault %d \n", fault);
    }
  return fault;
}

/***************************************************************************\
*        Get a halfword into Virtual Memory, maybe allocating the page          *
\***************************************************************************/
static fault_t
GetHalfWord (ARMul_State * state, ARMword address, ARMword * data)
{
  fault_t fault;

  fault = mmu_read_halfword (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
//              printf("SKYEYE: GetHalfWord fault %d \n", fault);
    }
  return fault;
}

/***************************************************************************\
*        Get a Word from Virtual Memory, maybe allocating the page          *
\***************************************************************************/

static fault_t
GetWord (ARMul_State * state, ARMword address, ARMword * data)
{
  fault_t fault;

  fault = mmu_read_word (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
#if 0
/* XXX */ extern int hack;
      hack = 1;
#endif
#if 0
      printf ("mmu_read_word at 0x%08x: ", address);
      switch (fault)
	{
	case ALIGNMENT_FAULT:
	  printf ("ALIGNMENT_FAULT");
	  break;
	case SECTION_TRANSLATION_FAULT:
	  printf ("SECTION_TRANSLATION_FAULT");
	  break;
	case PAGE_TRANSLATION_FAULT:
	  printf ("PAGE_TRANSLATION_FAULT");
	  break;
	case SECTION_DOMAIN_FAULT:
	  printf ("SECTION_DOMAIN_FAULT");
	  break;
	case SECTION_PERMISSION_FAULT:
	  printf ("SECTION_PERMISSION_FAULT");
	  break;
	case SUBPAGE_PERMISSION_FAULT:
	  printf ("SUBPAGE_PERMISSION_FAULT");
	  break;
	default:
	  printf ("Unrecognized fault number!");
	}
      printf ("\tpc = 0x%08x\n", state->Reg[15]);
#endif
    }
  return fault;
}

//2003-07-10 chy: lyh change
/****************************************************************************\
 * 			Load a Instrion Word into Virtual Memory						*
\****************************************************************************/
static fault_t
LoadInstr (ARMul_State * state, ARMword address, ARMword * instr)
{
  fault_t fault;
  fault = mmu_load_instr (state, address, instr);

  //if (fault)
  //      log_msg("load_instr fault = %d, address = %x\n", fault, address);
}

/***************************************************************************\
*        Put a byte into Virtual Memory, maybe allocating the page          *
\***************************************************************************/
static fault_t
PutByte (ARMul_State * state, ARMword address, ARMword data)
{
  fault_t fault;

  fault = mmu_write_byte (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
//              printf("SKYEYE: PutByte fault %d \n", fault);
    }
  return fault;
}

/***************************************************************************\
*        Put a halfword into Virtual Memory, maybe allocating the page          *
\***************************************************************************/
static fault_t
PutHalfWord (ARMul_State * state, ARMword address, ARMword data)
{
  fault_t fault;

  fault = mmu_write_halfword (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
//              printf("SKYEYE: PutHalfWord fault %d \n", fault);
    }
  return fault;
}

/***************************************************************************\
*        Put a Word into Virtual Memory, maybe allocating the page          *
\***************************************************************************/

static fault_t
PutWord (ARMul_State * state, ARMword address, ARMword data)
{
  fault_t fault;

  fault = mmu_write_word (state, address, data);
  if (fault)
    {
//chy 2003-07-11: sometime has fault, but linux can continue running  !!!!????
#if 0
/* XXX */ extern int hack;
      hack = 1;
#endif
#if 0
      printf ("mmu_write_word at 0x%08x: ", address);
      switch (fault)
	{
	case ALIGNMENT_FAULT:
	  printf ("ALIGNMENT_FAULT");
	  break;
	case SECTION_TRANSLATION_FAULT:
	  printf ("SECTION_TRANSLATION_FAULT");
	  break;
	case PAGE_TRANSLATION_FAULT:
	  printf ("PAGE_TRANSLATION_FAULT");
	  break;
	case SECTION_DOMAIN_FAULT:
	  printf ("SECTION_DOMAIN_FAULT");
	  break;
	case SECTION_PERMISSION_FAULT:
	  printf ("SECTION_PERMISSION_FAULT");
	  break;
	case SUBPAGE_PERMISSION_FAULT:
	  printf ("SUBPAGE_PERMISSION_FAULT");
	  break;
	default:
	  printf ("Unrecognized fault number!");
	}
      printf ("\tpc = 0x%08x\n", state->Reg[15]);
#endif
    }
  return fault;
}

/***************************************************************************\
*                      Initialise the memory interface                      *
\***************************************************************************/

unsigned
ARMul_MemoryInit (ARMul_State * state, unsigned long initmemsize)
{
  return TRUE;
}

/***************************************************************************\
*                         Remove the memory interface                       *
\***************************************************************************/

void
ARMul_MemoryExit (ARMul_State * state)
{
}

/***************************************************************************\
*                   ReLoad Instruction                                     *
\***************************************************************************/

ARMword
ARMul_ReLoadInstr (ARMul_State * state, ARMword address, ARMword isize)
{
  ARMword data;
  fault_t fault;

#ifdef ABORTS
  if (address >= LOWABORT && address < HIGHABORT)
    {
      ARMul_PREFETCHABORT (address);
      return ARMul_ABORTWORD;
    }
  else
    {
      ARMul_CLEARABORT;
    }
#endif

  if ((isize == 2) && (address & 0x2))
    {
      ARMword lo, hi;
      if (!(skyeye_cachetype == INSTCACHE))
	fault = GetWord (state, address, &lo);
      else
	fault = LoadInstr (state, address, &lo);

      if (!fault)
	{
	  if (!(skyeye_cachetype == INSTCACHE))
	    fault = GetWord (state, address + 4, &hi);
	  else
	    fault = LoadInstr (state, address + 4, &hi);

	}
      if (fault)
	{
	  ARMul_PREFETCHABORT (address);
	  return ARMul_ABORTWORD;
	}
      else
	{
	  ARMul_CLEARABORT;
	}

      if (state->bigendSig == HIGH)
	return (lo << 16) | (hi >> 16);
      else
	return ((hi & 0xFFFF) << 16) | (lo >> 16);
    }

  if (!(skyeye_cachetype == INSTCACHE))
    fault = GetWord (state, address, &data);
  else
    fault = LoadInstr (state, address, &data);

  if (fault)
    {
      ARMul_PREFETCHABORT (address);
      return ARMul_ABORTWORD;
    }
  else
    {
      ARMul_CLEARABORT;
    }

  return data;
}

/***************************************************************************\
*                   Load Instruction, Sequential Cycle                      *
\***************************************************************************/

ARMword
ARMul_LoadInstrS (ARMul_State * state, ARMword address, ARMword isize)
{
  state->NumScycles++;

#ifdef HOURGLASS
  if ((state->NumScycles & HOURGLASS_RATE) == 0)
    {
      HOURGLASS;
    }
#endif

  return ARMul_ReLoadInstr (state, address, isize);
}

/***************************************************************************\
*                 Load Instruction, Non Sequential Cycle                    *
\***************************************************************************/

ARMword
ARMul_LoadInstrN (ARMul_State * state, ARMword address, ARMword isize)
{
  state->NumNcycles++;

  return ARMul_ReLoadInstr (state, address, isize);
}

/***************************************************************************\
*                      Read Word (but don't tell anyone!)                   *
\***************************************************************************/

ARMword
ARMul_ReadWord (ARMul_State * state, ARMword address)
{
  ARMword data;
  fault_t fault;

#ifdef ABORTS
  if (address >= LOWABORT && address < HIGHABORT)
    {
      ARMul_DATAABORT (address);
      return ARMul_ABORTWORD;
    }
  else
    {
      ARMul_CLEARABORT;
    }
#endif

  fault = GetWord (state, address, &data);
  if (fault)
    {
      state->mmu.fault_status =
	(fault | (state->mmu.last_domain << 4)) & 0xFF;
      state->mmu.fault_address = address;
      ARMul_DATAABORT (address);
      return ARMul_ABORTWORD;
    }
  else
    {
      ARMul_CLEARABORT;
    }
  return data;
}

/***************************************************************************\
*                        Load Word, Sequential Cycle                        *