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Diffstat (limited to 'sim/arm/armvirt.c')
| -rw-r--r-- | sim/arm/armvirt.c | 517 |
1 files changed, 0 insertions, 517 deletions
diff --git a/sim/arm/armvirt.c b/sim/arm/armvirt.c deleted file mode 100644 index c162ba7..0000000 --- a/sim/arm/armvirt.c +++ /dev/null @@ -1,517 +0,0 @@ -/* 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 3 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, see <http://www.gnu.org/licenses/>. */ - -/* 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. */ - -/* This must come before any other includes. */ -#include "defs.h" - -#include "armos.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 - -#undef PAGESIZE /* Cleanup system headers. */ -#define NUMPAGES 64 * 1024 -#define PAGESIZE 64 * 1024 -#define PAGEBITS 16 -#define OFFSETBITS 0xffff - -int SWI_vector_installed = FALSE; - -/***************************************************************************\ -* Get a Word from Virtual Memory, maybe allocating the page * -\***************************************************************************/ - -static ARMword -GetWord (ARMul_State * state, ARMword address, int check) -{ - ARMword page; - ARMword offset; - ARMword **pagetable; - ARMword *pageptr; - - if (check && state->is_XScale) - XScale_check_memacc (state, &address, 0); - - page = address >> PAGEBITS; - offset = (address & OFFSETBITS) >> 2; - pagetable = (ARMword **) state->MemDataPtr; - pageptr = *(pagetable + page); - - if (pageptr == NULL) - { - pageptr = (ARMword *) malloc (PAGESIZE); - - if (pageptr == NULL) - { - perror ("ARMulator can't allocate VM page"); - exit (12); - } - - *(pagetable + page) = pageptr; - } - - return *(pageptr + offset); -} - -/***************************************************************************\ -* Put a Word into Virtual Memory, maybe allocating the page * -\***************************************************************************/ - -static void -PutWord (ARMul_State * state, ARMword address, ARMword data, int check) -{ - ARMword page; - ARMword offset; - ARMword **pagetable; - ARMword *pageptr; - - if (check && state->is_XScale) - XScale_check_memacc (state, &address, 1); - - page = address >> PAGEBITS; - offset = (address & OFFSETBITS) >> 2; - pagetable = (ARMword **) state->MemDataPtr; - pageptr = *(pagetable + page); - - if (pageptr == NULL) - { - pageptr = (ARMword *) malloc (PAGESIZE); - if (pageptr == NULL) - { - perror ("ARMulator can't allocate VM page"); - exit (13); - } - - *(pagetable + page) = pageptr; - } - - if (address == 0x8) - SWI_vector_installed = TRUE; - - *(pageptr + offset) = data; -} - -/***************************************************************************\ -* Initialise the memory interface * -\***************************************************************************/ - -unsigned -ARMul_MemoryInit (ARMul_State * state, unsigned long initmemsize) -{ - ARMword **pagetable; - unsigned page; - - if (initmemsize) - state->MemSize = initmemsize; - - pagetable = (ARMword **) malloc (sizeof (ARMword *) * NUMPAGES); - - if (pagetable == NULL) - return FALSE; - - for (page = 0; page < NUMPAGES; page++) - *(pagetable + page) = NULL; - - state->MemDataPtr = (unsigned char *) pagetable; - - ARMul_ConsolePrint (state, ", 4 Gb memory"); - - return TRUE; -} - -/***************************************************************************\ -* Remove the memory interface * -\***************************************************************************/ - -void -ARMul_MemoryExit (ARMul_State * state) -{ - ARMword page; - ARMword **pagetable; - ARMword *pageptr; - - pagetable = (ARMword **) state->MemDataPtr; - for (page = 0; page < NUMPAGES; page++) - { - pageptr = *(pagetable + page); - if (pageptr != NULL) - free ((char *) pageptr); - } - free ((char *) pagetable); - return; -} - -/***************************************************************************\ -* ReLoad Instruction * -\***************************************************************************/ - -ARMword -ARMul_ReLoadInstr (ARMul_State * state, ARMword address, ARMword isize) -{ -#ifdef ABORTS - if (address >= LOWABORT && address < HIGHABORT) - { - ARMul_PREFETCHABORT (address); - return ARMul_ABORTWORD; - } - else - { - ARMul_CLEARABORT; - } -#endif - - if ((isize == 2) && (address & 0x2)) - { - /* We return the next two halfwords: */ - ARMword lo = GetWord (state, address, FALSE); - ARMword hi = GetWord (state, address + 4, FALSE); - - if (state->bigendSig == HIGH) - return (lo << 16) | (hi >> 16); - else - return ((hi & 0xFFFF) << 16) | (lo >> 16); - } - - return GetWord (state, address, TRUE); -} - -/***************************************************************************\ -* Load Instruction, Sequential Cycle * -\***************************************************************************/ - -ARMword ARMul_LoadInstrS (ARMul_State * state, ARMword address, ARMword isize) -{ - state->NumScycles++; - - 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) -{ -#ifdef ABORTS - if (address >= LOWABORT && address < HIGHABORT) - { - ARMul_DATAABORT (address); - return ARMul_ABORTWORD; - } - else - { - ARMul_CLEARABORT; - } -#endif - - return GetWord (state, address, TRUE); -} - -/***************************************************************************\ -* Load Word, Sequential Cycle * -\***************************************************************************/ - -ARMword ARMul_LoadWordS (ARMul_State * state, ARMword address) -{ - state->NumScycles++; - - return ARMul_ReadWord (state, address); -} - -/***************************************************************************\ -* Load Word, Non Sequential Cycle * -\***************************************************************************/ - -ARMword ARMul_LoadWordN (ARMul_State * state, ARMword address) -{ - state->NumNcycles++; - - return ARMul_ReadWord (state, address); -} - -/***************************************************************************\ -* Load Halfword, (Non Sequential Cycle) * -\***************************************************************************/ - -ARMword ARMul_LoadHalfWord (ARMul_State * state, ARMword address) -{ - ARMword temp, offset; - - state->NumNcycles++; - - temp = ARMul_ReadWord (state, address); - offset = (((ARMword) state->bigendSig * 2) ^ (address & 2)) << 3; /* bit offset into the word */ - - return (temp >> offset) & 0xffff; -} - -/***************************************************************************\ -* Read Byte (but don't tell anyone!) * -\***************************************************************************/ - -ARMword ARMul_ReadByte (ARMul_State * state, ARMword address) -{ - ARMword temp, offset; - - temp = ARMul_ReadWord (state, address); - offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; /* bit offset into the word */ - - return (temp >> offset & 0xffL); -} - -/***************************************************************************\ -* Load Byte, (Non Sequential Cycle) * -\***************************************************************************/ - -ARMword ARMul_LoadByte (ARMul_State * state, ARMword address) -{ - state->NumNcycles++; - - return ARMul_ReadByte (state, address); -} - -/***************************************************************************\ -* Write Word (but don't tell anyone!) * -\***************************************************************************/ - -void -ARMul_WriteWord (ARMul_State * state, ARMword address, ARMword data) -{ -#ifdef ABORTS - if (address >= LOWABORT && address < HIGHABORT) - { - ARMul_DATAABORT (address); - return; - } - else - { - ARMul_CLEARABORT; - } -#endif - - PutWord (state, address, data, TRUE); -} - -/***************************************************************************\ -* Store Word, Sequential Cycle * -\***************************************************************************/ - -void -ARMul_StoreWordS (ARMul_State * state, ARMword address, ARMword data) -{ - state->NumScycles++; - - ARMul_WriteWord (state, address, data); -} - -/***************************************************************************\ -* Store Word, Non Sequential Cycle * -\***************************************************************************/ - -void -ARMul_StoreWordN (ARMul_State * state, ARMword address, ARMword data) -{ - state->NumNcycles++; - - ARMul_WriteWord (state, address, data); -} - -/***************************************************************************\ -* Store HalfWord, (Non Sequential Cycle) * -\***************************************************************************/ - -void -ARMul_StoreHalfWord (ARMul_State * state, ARMword address, ARMword data) -{ - ARMword temp, offset; - - state->NumNcycles++; - -#ifdef VALIDATE - if (address == TUBE) - { - if (data == 4) - state->Emulate = FALSE; - else - (void) putc ((char) data, stderr); /* Write Char */ - return; - } -#endif - - temp = ARMul_ReadWord (state, address); - offset = (((ARMword) state->bigendSig * 2) ^ (address & 2)) << 3; /* bit offset into the word */ - - PutWord (state, address, - (temp & ~(0xffffL << offset)) | ((data & 0xffffL) << offset), - TRUE); -} - -/***************************************************************************\ -* Write Byte (but don't tell anyone!) * -\***************************************************************************/ - -void -ARMul_WriteByte (ARMul_State * state, ARMword address, ARMword data) -{ - ARMword temp, offset; - - temp = ARMul_ReadWord (state, address); - offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; /* bit offset into the word */ - - PutWord (state, address, - (temp & ~(0xffL << offset)) | ((data & 0xffL) << offset), - TRUE); -} - -/***************************************************************************\ -* Store Byte, (Non Sequential Cycle) * -\***************************************************************************/ - -void -ARMul_StoreByte (ARMul_State * state, ARMword address, ARMword data) -{ - state->NumNcycles++; - -#ifdef VALIDATE - if (address == TUBE) - { - if (data == 4) - state->Emulate = FALSE; - else - (void) putc ((char) data, stderr); /* Write Char */ - return; - } -#endif - - ARMul_WriteByte (state, address, data); -} - -/***************************************************************************\ -* Swap Word, (Two Non Sequential Cycles) * -\***************************************************************************/ - -ARMword ARMul_SwapWord (ARMul_State * state, ARMword address, ARMword data) -{ - ARMword temp; - - state->NumNcycles++; - - temp = ARMul_ReadWord (state, address); - - state->NumNcycles++; - - PutWord (state, address, data, TRUE); - - return temp; -} - -/***************************************************************************\ -* Swap Byte, (Two Non Sequential Cycles) * -\***************************************************************************/ - -ARMword ARMul_SwapByte (ARMul_State * state, ARMword address, ARMword data) -{ - ARMword temp; - - temp = ARMul_LoadByte (state, address); - ARMul_StoreByte (state, address, data); - - return temp; -} - -/***************************************************************************\ -* Count I Cycles * -\***************************************************************************/ - -void -ARMul_Icycles (ARMul_State * state, unsigned number, ARMword address ATTRIBUTE_UNUSED) -{ - state->NumIcycles += number; - ARMul_CLEARABORT; -} - -/***************************************************************************\ -* Count C Cycles * -\***************************************************************************/ - -void -ARMul_Ccycles (ARMul_State * state, unsigned number, ARMword address ATTRIBUTE_UNUSED) -{ - state->NumCcycles += number; - ARMul_CLEARABORT; -} - - -/* Read a byte. Do not check for alignment or access errors. */ - -ARMword -ARMul_SafeReadByte (ARMul_State * state, ARMword address) -{ - ARMword temp, offset; - - temp = GetWord (state, address, FALSE); - offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; - - return (temp >> offset & 0xffL); -} - -void -ARMul_SafeWriteByte (ARMul_State * state, ARMword address, ARMword data) -{ - ARMword temp, offset; - - temp = GetWord (state, address, FALSE); - offset = (((ARMword) state->bigendSig * 3) ^ (address & 3)) << 3; - - PutWord (state, address, - (temp & ~(0xffL << offset)) | ((data & 0xffL) << offset), - FALSE); -} |