1 /* armvirt.c -- ARMulator virtual memory interace: ARM6 Instruction Emulator.
2 Copyright (C) 1994 Advanced RISC Machines Ltd.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* This file contains a complete ARMulator memory model, modelling a
19 "virtual memory" system. A much simpler model can be found in armfast.c,
20 and that model goes faster too, but has a fixed amount of memory. This
21 model's memory has 64K pages, allocated on demand from a 64K entry page
22 table. The routines PutWord and GetWord implement this. Pages are never
23 freed as they might be needed again. A single area of memory may be
24 defined to generate aborts. */
29 #ifdef VALIDATE /* for running the validate suite */
30 #define TUBE 48 * 1024 * 1024 /* write a char on the screen */
36 #ifdef ABORTS /* the memory system will abort */
37 /* For the old test suite Abort between 32 Kbytes and 32 Mbytes
38 For the new test suite Abort between 8 Mbytes and 26 Mbytes */
39 /* #define LOWABORT 32 * 1024
40 #define HIGHABORT 32 * 1024 * 1024 */
41 #define LOWABORT 8 * 1024 * 1024
42 #define HIGHABORT 26 * 1024 * 1024
46 #define NUMPAGES 64 * 1024
47 #define PAGESIZE 64 * 1024
49 #define OFFSETBITS 0xffff
51 /***************************************************************************\
52 * Get a Word from Virtual Memory, maybe allocating the page *
53 \***************************************************************************/
56 GetWord (ARMul_State
* state
, ARMword address
)
63 page
= address
>> PAGEBITS
;
64 offset
= (address
& OFFSETBITS
) >> 2;
65 pagetable
= (ARMword
**) state
->MemDataPtr
;
66 pageptr
= *(pagetable
+ page
);
70 pageptr
= (ARMword
*) malloc (PAGESIZE
);
74 perror ("ARMulator can't allocate VM page");
78 *(pagetable
+ page
) = pageptr
;
81 return *(pageptr
+ offset
);
84 /***************************************************************************\
85 * Put a Word into Virtual Memory, maybe allocating the page *
86 \***************************************************************************/
89 PutWord (ARMul_State
* state
, ARMword address
, ARMword data
)
96 page
= address
>> PAGEBITS
;
97 offset
= (address
& OFFSETBITS
) >> 2;
98 pagetable
= (ARMword
**) state
->MemDataPtr
;
99 pageptr
= *(pagetable
+ page
);
103 pageptr
= (ARMword
*) malloc (PAGESIZE
);
106 perror ("ARMulator can't allocate VM page");
110 *(pagetable
+ page
) = pageptr
;
113 *(pageptr
+ offset
) = data
;
116 /***************************************************************************\
117 * Initialise the memory interface *
118 \***************************************************************************/
121 ARMul_MemoryInit (ARMul_State
* state
, unsigned long initmemsize
)
127 state
->MemSize
= initmemsize
;
129 pagetable
= (ARMword
**) malloc (sizeof (ARMword
) * NUMPAGES
);
131 if (pagetable
== NULL
)
134 for (page
= 0; page
< NUMPAGES
; page
++)
135 *(pagetable
+ page
) = NULL
;
137 state
->MemDataPtr
= (unsigned char *) pagetable
;
139 ARMul_ConsolePrint (state
, ", 4 Gb memory");
144 /***************************************************************************\
145 * Remove the memory interface *
146 \***************************************************************************/
149 ARMul_MemoryExit (ARMul_State
* state
)
155 pagetable
= (ARMword
**) state
->MemDataPtr
;
156 for (page
= 0; page
< NUMPAGES
; page
++)
158 pageptr
= *(pagetable
+ page
);
160 free ((char *) pageptr
);
162 free ((char *) pagetable
);
166 /***************************************************************************\
167 * ReLoad Instruction *
168 \***************************************************************************/
171 ARMul_ReLoadInstr (ARMul_State
* state
, ARMword address
, ARMword isize
)
174 if (address
>= LOWABORT
&& address
< HIGHABORT
)
176 ARMul_PREFETCHABORT (address
);
177 return ARMul_ABORTWORD
;
185 if ((isize
== 2) && (address
& 0x2))
187 /* We return the next two halfwords: */
188 ARMword lo
= GetWord (state
, address
);
189 ARMword hi
= GetWord (state
, address
+ 4);
191 if (state
->bigendSig
== HIGH
)
192 return (lo
<< 16) | (hi
>> 16);
194 return ((hi
& 0xFFFF) << 16) | (lo
>> 16);
197 return GetWord (state
, address
);
200 /***************************************************************************\
201 * Load Instruction, Sequential Cycle *
202 \***************************************************************************/
204 ARMword
ARMul_LoadInstrS (ARMul_State
* state
, ARMword address
, ARMword isize
)
209 if ((state
->NumScycles
& HOURGLASS_RATE
) == 0)
215 return ARMul_ReLoadInstr (state
, address
, isize
);
218 /***************************************************************************\
219 * Load Instruction, Non Sequential Cycle *
220 \***************************************************************************/
222 ARMword
ARMul_LoadInstrN (ARMul_State
* state
, ARMword address
, ARMword isize
)
226 return ARMul_ReLoadInstr (state
, address
, isize
);
229 /***************************************************************************\
230 * Read Word (but don't tell anyone!) *
231 \***************************************************************************/
233 ARMword
ARMul_ReadWord (ARMul_State
* state
, ARMword address
)
236 if (address
>= LOWABORT
&& address
< HIGHABORT
)
238 ARMul_DATAABORT (address
);
239 return ARMul_ABORTWORD
;
247 return GetWord (state
, address
);
250 /***************************************************************************\
251 * Load Word, Sequential Cycle *
252 \***************************************************************************/
254 ARMword
ARMul_LoadWordS (ARMul_State
* state
, ARMword address
)
258 return ARMul_ReadWord (state
, address
);
261 /***************************************************************************\
262 * Load Word, Non Sequential Cycle *
263 \***************************************************************************/
265 ARMword
ARMul_LoadWordN (ARMul_State
* state
, ARMword address
)
269 return ARMul_ReadWord (state
, address
);
272 /***************************************************************************\
273 * Load Halfword, (Non Sequential Cycle) *
274 \***************************************************************************/
276 ARMword
ARMul_LoadHalfWord (ARMul_State
* state
, ARMword address
)
278 ARMword temp
, offset
;
282 temp
= ARMul_ReadWord (state
, address
);
283 offset
= (((ARMword
) state
->bigendSig
* 2) ^ (address
& 2)) << 3; /* bit offset into the word */
285 return (temp
>> offset
) & 0xffff;
288 /***************************************************************************\
289 * Read Byte (but don't tell anyone!) *
290 \***************************************************************************/
292 ARMword
ARMul_ReadByte (ARMul_State
* state
, ARMword address
)
294 ARMword temp
, offset
;
296 temp
= ARMul_ReadWord (state
, address
);
297 offset
= (((ARMword
) state
->bigendSig
* 3) ^ (address
& 3)) << 3; /* bit offset into the word */
299 return (temp
>> offset
& 0xffL
);
302 /***************************************************************************\
303 * Load Byte, (Non Sequential Cycle) *
304 \***************************************************************************/
306 ARMword
ARMul_LoadByte (ARMul_State
* state
, ARMword address
)
310 return ARMul_ReadByte (state
, address
);
313 /***************************************************************************\
314 * Write Word (but don't tell anyone!) *
315 \***************************************************************************/
318 ARMul_WriteWord (ARMul_State
* state
, ARMword address
, ARMword data
)
321 if (address
>= LOWABORT
&& address
< HIGHABORT
)
323 ARMul_DATAABORT (address
);
332 PutWord (state
, address
, data
);
335 /***************************************************************************\
336 * Store Word, Sequential Cycle *
337 \***************************************************************************/
340 ARMul_StoreWordS (ARMul_State
* state
, ARMword address
, ARMword data
)
344 ARMul_WriteWord (state
, address
, data
);
347 /***************************************************************************\
348 * Store Word, Non Sequential Cycle *
349 \***************************************************************************/
352 ARMul_StoreWordN (ARMul_State
* state
, ARMword address
, ARMword data
)
356 ARMul_WriteWord (state
, address
, data
);
359 /***************************************************************************\
360 * Store HalfWord, (Non Sequential Cycle) *
361 \***************************************************************************/
364 ARMul_StoreHalfWord (ARMul_State
* state
, ARMword address
, ARMword data
)
366 ARMword temp
, offset
;
374 state
->Emulate
= FALSE
;
376 (void) putc ((char) data
, stderr
); /* Write Char */
381 temp
= ARMul_ReadWord (state
, address
);
382 offset
= (((ARMword
) state
->bigendSig
* 2) ^ (address
& 2)) << 3; /* bit offset into the word */
384 PutWord (state
, address
,
385 (temp
& ~(0xffffL
<< offset
)) | ((data
& 0xffffL
) << offset
));
388 /***************************************************************************\
389 * Write Byte (but don't tell anyone!) *
390 \***************************************************************************/
393 ARMul_WriteByte (ARMul_State
* state
, ARMword address
, ARMword data
)
395 ARMword temp
, offset
;
397 temp
= ARMul_ReadWord (state
, address
);
398 offset
= (((ARMword
) state
->bigendSig
* 3) ^ (address
& 3)) << 3; /* bit offset into the word */
400 PutWord (state
, address
,
401 (temp
& ~(0xffL
<< offset
)) | ((data
& 0xffL
) << offset
));
404 /***************************************************************************\
405 * Store Byte, (Non Sequential Cycle) *
406 \***************************************************************************/
409 ARMul_StoreByte (ARMul_State
* state
, ARMword address
, ARMword data
)
417 state
->Emulate
= FALSE
;
419 (void) putc ((char) data
, stderr
); /* Write Char */
424 ARMul_WriteByte (state
, address
, data
);
427 /***************************************************************************\
428 * Swap Word, (Two Non Sequential Cycles) *
429 \***************************************************************************/
431 ARMword
ARMul_SwapWord (ARMul_State
* state
, ARMword address
, ARMword data
)
437 temp
= ARMul_ReadWord (state
, address
);
441 PutWord (state
, address
, data
);
446 /***************************************************************************\
447 * Swap Byte, (Two Non Sequential Cycles) *
448 \***************************************************************************/
450 ARMword
ARMul_SwapByte (ARMul_State
* state
, ARMword address
, ARMword data
)
454 temp
= ARMul_LoadByte (state
, address
);
455 ARMul_StoreByte (state
, address
, data
);
460 /***************************************************************************\
462 \***************************************************************************/
465 ARMul_Icycles (ARMul_State
* state
, unsigned number
, ARMword address
)
467 state
->NumIcycles
+= number
;
471 /***************************************************************************\
473 \***************************************************************************/
476 ARMul_Ccycles (ARMul_State
* state
, unsigned number
, ARMword address
)
478 state
->NumCcycles
+= number
;
This page took 0.042504 seconds and 5 git commands to generate.