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fd0975b96b
Some targets (like cygwin) will export page size defines that clash with our local usage here. Undefine the system one to fix building for these targets.
518 lines
15 KiB
C
518 lines
15 KiB
C
/* armvirt.c -- ARMulator virtual memory interace: 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 3 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, see <http://www.gnu.org/licenses/>. */
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/* This file contains a complete ARMulator memory model, modelling a
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"virtual memory" system. A much simpler model can be found in armfast.c,
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and that model goes faster too, but has a fixed amount of memory. This
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model's memory has 64K pages, allocated on demand from a 64K entry page
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table. The routines PutWord and GetWord implement this. Pages are never
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freed as they might be needed again. A single area of memory may be
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defined to generate aborts. */
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/* This must come before any other includes. */
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#include "defs.h"
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#include "armos.h"
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#include "armdefs.h"
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#include "ansidecl.h"
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#ifdef VALIDATE /* for running the validate suite */
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#define TUBE 48 * 1024 * 1024 /* write a char on the screen */
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#define ABORTS 1
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#endif
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/* #define ABORTS */
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#ifdef ABORTS /* the memory system will abort */
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/* For the old test suite Abort between 32 Kbytes and 32 Mbytes
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For the new test suite Abort between 8 Mbytes and 26 Mbytes */
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/* #define LOWABORT 32 * 1024
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#define HIGHABORT 32 * 1024 * 1024 */
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#define LOWABORT 8 * 1024 * 1024
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#define HIGHABORT 26 * 1024 * 1024
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#endif
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#undef PAGESIZE /* Cleanup system headers. */
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#define NUMPAGES 64 * 1024
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#define PAGESIZE 64 * 1024
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#define PAGEBITS 16
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#define OFFSETBITS 0xffff
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int SWI_vector_installed = FALSE;
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/***************************************************************************\
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* Get a Word from Virtual Memory, maybe allocating the page *
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\***************************************************************************/
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static ARMword
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GetWord (ARMul_State * state, ARMword address, int check)
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{
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ARMword page;
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ARMword offset;
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ARMword **pagetable;
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ARMword *pageptr;
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if (check && state->is_XScale)
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XScale_check_memacc (state, &address, 0);
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page = address >> PAGEBITS;
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offset = (address & OFFSETBITS) >> 2;
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pagetable = (ARMword **) state->MemDataPtr;
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pageptr = *(pagetable + page);
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if (pageptr == NULL)
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{
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pageptr = (ARMword *) malloc (PAGESIZE);
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if (pageptr == NULL)
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{
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perror ("ARMulator can't allocate VM page");
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exit (12);
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}
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*(pagetable + page) = pageptr;
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}
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return *(pageptr + offset);
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}
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/***************************************************************************\
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* Put a Word into Virtual Memory, maybe allocating the page *
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\***************************************************************************/
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static void
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PutWord (ARMul_State * state, ARMword address, ARMword data, int check)
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{
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ARMword page;
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ARMword offset;
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ARMword **pagetable;
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ARMword *pageptr;
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if (check && state->is_XScale)
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XScale_check_memacc (state, &address, 1);
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page = address >> PAGEBITS;
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offset = (address & OFFSETBITS) >> 2;
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pagetable = (ARMword **) state->MemDataPtr;
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pageptr = *(pagetable + page);
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if (pageptr == NULL)
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{
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pageptr = (ARMword *) malloc (PAGESIZE);
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if (pageptr == NULL)
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{
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perror ("ARMulator can't allocate VM page");
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exit (13);
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}
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*(pagetable + page) = pageptr;
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}
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if (address == 0x8)
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SWI_vector_installed = TRUE;
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*(pageptr + offset) = data;
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}
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/***************************************************************************\
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* Initialise the memory interface *
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\***************************************************************************/
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unsigned
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ARMul_MemoryInit (ARMul_State * state, unsigned long initmemsize)
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{
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ARMword **pagetable;
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unsigned page;
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if (initmemsize)
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state->MemSize = initmemsize;
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pagetable = (ARMword **) malloc (sizeof (ARMword *) * NUMPAGES);
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if (pagetable == NULL)
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return FALSE;
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for (page = 0; page < NUMPAGES; page++)
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*(pagetable + page) = NULL;
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state->MemDataPtr = (unsigned char *) pagetable;
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ARMul_ConsolePrint (state, ", 4 Gb memory");
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return TRUE;
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}
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/***************************************************************************\
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* Remove the memory interface *
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\***************************************************************************/
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void
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ARMul_MemoryExit (ARMul_State * state)
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{
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ARMword page;
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ARMword **pagetable;
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ARMword *pageptr;
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pagetable = (ARMword **) state->MemDataPtr;
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for (page = 0; page < NUMPAGES; page++)
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{
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pageptr = *(pagetable + page);
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if (pageptr != NULL)
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free ((char *) pageptr);
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}
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free ((char *) pagetable);
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return;
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}
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/***************************************************************************\
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* ReLoad Instruction *
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\***************************************************************************/
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ARMword
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ARMul_ReLoadInstr (ARMul_State * state, ARMword address, ARMword isize)
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{
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#ifdef ABORTS
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if (address >= LOWABORT && address < HIGHABORT)
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{
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ARMul_PREFETCHABORT (address);
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return ARMul_ABORTWORD;
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}
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else
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{
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ARMul_CLEARABORT;
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}
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#endif
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if ((isize == 2) && (address & 0x2))
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{
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/* We return the next two halfwords: */
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ARMword lo = GetWord (state, address, FALSE);
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ARMword hi = GetWord (state, address + 4, FALSE);
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if (state->bigendSig == HIGH)
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return (lo << 16) | (hi >> 16);
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else
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return ((hi & 0xFFFF) << 16) | (lo >> 16);
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}
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return GetWord (state, address, TRUE);
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}
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/***************************************************************************\
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* Load Instruction, Sequential Cycle *
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\***************************************************************************/
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ARMword ARMul_LoadInstrS (ARMul_State * state, ARMword address, ARMword isize)
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{
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state->NumScycles++;
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return ARMul_ReLoadInstr (state, address, isize);
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}
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/***************************************************************************\
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* Load Instruction, Non Sequential Cycle *
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\***************************************************************************/
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ARMword ARMul_LoadInstrN (ARMul_State * state, ARMword address, ARMword isize)
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{
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state->NumNcycles++;
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return ARMul_ReLoadInstr (state, address, isize);
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}
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/***************************************************************************\
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* Read Word (but don't tell anyone!) *
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\***************************************************************************/
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ARMword ARMul_ReadWord (ARMul_State * state, ARMword address)
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{
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#ifdef ABORTS
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if (address >= LOWABORT && address < HIGHABORT)
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{
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ARMul_DATAABORT (address);
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return ARMul_ABORTWORD;
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}
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else
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{
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ARMul_CLEARABORT;
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}
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#endif
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return GetWord (state, address, TRUE);
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}
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/***************************************************************************\
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* Load Word, Sequential Cycle *
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\***************************************************************************/
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ARMword ARMul_LoadWordS (ARMul_State * state, ARMword address)
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{
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state->NumScycles++;
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return ARMul_ReadWord (state, address);
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}
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/***************************************************************************\
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* Load Word, Non Sequential Cycle *
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\***************************************************************************/
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ARMword ARMul_LoadWordN (ARMul_State * state, ARMword address)
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{
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state->NumNcycles++;
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return ARMul_ReadWord (state, address);
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}
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/***************************************************************************\
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* Load Halfword, (Non Sequential Cycle) *
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\***************************************************************************/
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ARMword ARMul_LoadHalfWord (ARMul_State * state, ARMword address)
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{
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ARMword temp, offset;
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state->NumNcycles++;
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temp = ARMul_ReadWord (state, address);
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offset = (((ARMword) state->bigendSig * 2) ^ (address & 2)) << 3; /* bit offset into the word */
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return (temp >> offset) & 0xffff;
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}
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/***************************************************************************\
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* Read Byte (but don't tell anyone!) *
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\***************************************************************************/
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ARMword ARMul_ReadByte (ARMul_State * state, ARMword address)
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{
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ARMword temp, offset;
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temp = ARMul_ReadWord (state, address);
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offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; /* bit offset into the word */
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return (temp >> offset & 0xffL);
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}
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/***************************************************************************\
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* Load Byte, (Non Sequential Cycle) *
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\***************************************************************************/
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ARMword ARMul_LoadByte (ARMul_State * state, ARMword address)
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{
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state->NumNcycles++;
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return ARMul_ReadByte (state, address);
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}
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/***************************************************************************\
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* Write Word (but don't tell anyone!) *
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\***************************************************************************/
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void
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ARMul_WriteWord (ARMul_State * state, ARMword address, ARMword data)
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{
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#ifdef ABORTS
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if (address >= LOWABORT && address < HIGHABORT)
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{
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ARMul_DATAABORT (address);
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return;
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}
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else
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{
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ARMul_CLEARABORT;
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}
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#endif
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PutWord (state, address, data, TRUE);
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}
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/***************************************************************************\
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* Store Word, Sequential Cycle *
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\***************************************************************************/
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void
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ARMul_StoreWordS (ARMul_State * state, ARMword address, ARMword data)
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{
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state->NumScycles++;
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ARMul_WriteWord (state, address, data);
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}
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/***************************************************************************\
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* Store Word, Non Sequential Cycle *
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\***************************************************************************/
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void
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ARMul_StoreWordN (ARMul_State * state, ARMword address, ARMword data)
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{
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state->NumNcycles++;
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ARMul_WriteWord (state, address, data);
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}
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/***************************************************************************\
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* Store HalfWord, (Non Sequential Cycle) *
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\***************************************************************************/
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void
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ARMul_StoreHalfWord (ARMul_State * state, ARMword address, ARMword data)
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{
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ARMword temp, offset;
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state->NumNcycles++;
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#ifdef VALIDATE
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if (address == TUBE)
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{
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if (data == 4)
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state->Emulate = FALSE;
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else
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(void) putc ((char) data, stderr); /* Write Char */
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return;
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}
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#endif
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temp = ARMul_ReadWord (state, address);
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offset = (((ARMword) state->bigendSig * 2) ^ (address & 2)) << 3; /* bit offset into the word */
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PutWord (state, address,
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(temp & ~(0xffffL << offset)) | ((data & 0xffffL) << offset),
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TRUE);
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}
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/***************************************************************************\
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* Write Byte (but don't tell anyone!) *
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\***************************************************************************/
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void
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ARMul_WriteByte (ARMul_State * state, ARMword address, ARMword data)
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{
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ARMword temp, offset;
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temp = ARMul_ReadWord (state, address);
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offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; /* bit offset into the word */
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PutWord (state, address,
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(temp & ~(0xffL << offset)) | ((data & 0xffL) << offset),
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TRUE);
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}
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/***************************************************************************\
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* Store Byte, (Non Sequential Cycle) *
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\***************************************************************************/
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void
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ARMul_StoreByte (ARMul_State * state, ARMword address, ARMword data)
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{
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state->NumNcycles++;
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#ifdef VALIDATE
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if (address == TUBE)
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{
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if (data == 4)
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state->Emulate = FALSE;
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else
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(void) putc ((char) data, stderr); /* Write Char */
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return;
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}
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#endif
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ARMul_WriteByte (state, address, data);
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}
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/***************************************************************************\
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* Swap Word, (Two Non Sequential Cycles) *
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\***************************************************************************/
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ARMword ARMul_SwapWord (ARMul_State * state, ARMword address, ARMword data)
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{
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ARMword temp;
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state->NumNcycles++;
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temp = ARMul_ReadWord (state, address);
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state->NumNcycles++;
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PutWord (state, address, data, TRUE);
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return temp;
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}
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/***************************************************************************\
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* Swap Byte, (Two Non Sequential Cycles) *
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\***************************************************************************/
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ARMword ARMul_SwapByte (ARMul_State * state, ARMword address, ARMword data)
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{
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ARMword temp;
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temp = ARMul_LoadByte (state, address);
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ARMul_StoreByte (state, address, data);
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return temp;
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}
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/***************************************************************************\
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* Count I Cycles *
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\***************************************************************************/
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void
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ARMul_Icycles (ARMul_State * state, unsigned number, ARMword address ATTRIBUTE_UNUSED)
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{
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state->NumIcycles += number;
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ARMul_CLEARABORT;
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}
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/***************************************************************************\
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* Count C Cycles *
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\***************************************************************************/
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void
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ARMul_Ccycles (ARMul_State * state, unsigned number, ARMword address ATTRIBUTE_UNUSED)
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{
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state->NumCcycles += number;
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ARMul_CLEARABORT;
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}
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/* Read a byte. Do not check for alignment or access errors. */
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ARMword
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ARMul_SafeReadByte (ARMul_State * state, ARMword address)
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{
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ARMword temp, offset;
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temp = GetWord (state, address, FALSE);
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offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3;
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return (temp >> offset & 0xffL);
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}
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void
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ARMul_SafeWriteByte (ARMul_State * state, ARMword address, ARMword data)
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{
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ARMword temp, offset;
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temp = GetWord (state, address, FALSE);
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offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3;
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PutWord (state, address,
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(temp & ~(0xffL << offset)) | ((data & 0xffL) << offset),
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FALSE);
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}
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