| 1 |
/* |
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* Copyright (C) 2003-2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: memory_rw.c,v 1.80 2005/11/20 11:28:44 debug Exp $ |
| 29 |
* |
| 30 |
* Generic memory_rw(), with special hacks for specific CPU families. |
| 31 |
* |
| 32 |
* Example for inclusion from memory_mips.c: |
| 33 |
* |
| 34 |
* MEMORY_RW should be mips_memory_rw |
| 35 |
* MEM_MIPS should be defined |
| 36 |
*/ |
| 37 |
|
| 38 |
|
| 39 |
/* |
| 40 |
* memory_rw(): |
| 41 |
* |
| 42 |
* Read or write data from/to memory. |
| 43 |
* |
| 44 |
* cpu the cpu doing the read/write |
| 45 |
* mem the memory object to use |
| 46 |
* vaddr the virtual address |
| 47 |
* data a pointer to the data to be written to memory, or |
| 48 |
* a placeholder for data when reading from memory |
| 49 |
* len the length of the 'data' buffer |
| 50 |
* writeflag set to MEM_READ or MEM_WRITE |
| 51 |
* misc_flags CACHE_{NONE,DATA,INSTRUCTION} | other flags |
| 52 |
* |
| 53 |
* If the address indicates access to a memory mapped device, that device' |
| 54 |
* read/write access function is called. |
| 55 |
* |
| 56 |
* If instruction latency/delay support is enabled, then |
| 57 |
* cpu->instruction_delay is increased by the number of instruction to |
| 58 |
* delay execution. |
| 59 |
* |
| 60 |
* This function should not be called with cpu == NULL. |
| 61 |
* |
| 62 |
* Returns one of the following: |
| 63 |
* MEMORY_ACCESS_FAILED |
| 64 |
* MEMORY_ACCESS_OK |
| 65 |
* |
| 66 |
* (MEMORY_ACCESS_FAILED is 0.) |
| 67 |
*/ |
| 68 |
int MEMORY_RW(struct cpu *cpu, struct memory *mem, uint64_t vaddr, |
| 69 |
unsigned char *data, size_t len, int writeflag, int misc_flags) |
| 70 |
{ |
| 71 |
#ifdef MEM_ALPHA |
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const int offset_mask = 0x1fff; |
| 73 |
#else |
| 74 |
const int offset_mask = 0xfff; |
| 75 |
#endif |
| 76 |
|
| 77 |
#ifndef MEM_USERLAND |
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int ok = 1; |
| 79 |
#endif |
| 80 |
uint64_t paddr; |
| 81 |
int cache, no_exceptions, offset; |
| 82 |
unsigned char *memblock; |
| 83 |
#ifdef MEM_MIPS |
| 84 |
int bintrans_cached = cpu->machine->bintrans_enable; |
| 85 |
#endif |
| 86 |
int bintrans_device_danger = 0; |
| 87 |
|
| 88 |
no_exceptions = misc_flags & NO_EXCEPTIONS; |
| 89 |
cache = misc_flags & CACHE_FLAGS_MASK; |
| 90 |
|
| 91 |
#ifdef MEM_X86 |
| 92 |
/* Real-mode wrap-around: */ |
| 93 |
if (REAL_MODE && !(misc_flags & PHYSICAL)) { |
| 94 |
if ((vaddr & 0xffff) + len > 0x10000) { |
| 95 |
/* Do one byte at a time: */ |
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int res = 0, i; |
| 97 |
for (i=0; i<len; i++) |
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res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
| 99 |
writeflag, misc_flags); |
| 100 |
return res; |
| 101 |
} |
| 102 |
} |
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|
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/* Crossing a page boundary? Then do one byte at a time: */ |
| 105 |
if ((vaddr & 0xfff) + len > 0x1000 && !(misc_flags & PHYSICAL) |
| 106 |
&& cpu->cd.x86.cr[0] & X86_CR0_PG) { |
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/* For WRITES: Read ALL BYTES FIRST and write them back!!! |
| 108 |
Then do a write of all the new bytes. This is to make sure |
| 109 |
than both pages around the boundary are writable so we don't |
| 110 |
do a partial write. */ |
| 111 |
int res = 0, i; |
| 112 |
if (writeflag == MEM_WRITE) { |
| 113 |
unsigned char tmp; |
| 114 |
for (i=0; i<len; i++) { |
| 115 |
res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1, |
| 116 |
MEM_READ, misc_flags); |
| 117 |
if (!res) |
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return 0; |
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res = MEMORY_RW(cpu, mem, vaddr+i, &tmp, 1, |
| 120 |
MEM_WRITE, misc_flags); |
| 121 |
if (!res) |
| 122 |
return 0; |
| 123 |
} |
| 124 |
for (i=0; i<len; i++) { |
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res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
| 126 |
MEM_WRITE, misc_flags); |
| 127 |
if (!res) |
| 128 |
return 0; |
| 129 |
} |
| 130 |
} else { |
| 131 |
for (i=0; i<len; i++) { |
| 132 |
/* Do one byte at a time: */ |
| 133 |
res = MEMORY_RW(cpu, mem, vaddr+i, &data[i], 1, |
| 134 |
writeflag, misc_flags); |
| 135 |
if (!res) { |
| 136 |
if (cache == CACHE_INSTRUCTION) { |
| 137 |
fatal("FAILED instruction " |
| 138 |
"fetch across page boundar" |
| 139 |
"y: todo. vaddr=0x%08x\n", |
| 140 |
(int)vaddr); |
| 141 |
cpu->running = 0; |
| 142 |
} |
| 143 |
return 0; |
| 144 |
} |
| 145 |
} |
| 146 |
} |
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return res; |
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} |
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#endif /* X86 */ |
| 150 |
|
| 151 |
#ifdef MEM_MIPS |
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if (bintrans_cached) { |
| 153 |
if (cache == CACHE_INSTRUCTION) { |
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cpu->cd.mips.pc_bintrans_host_4kpage = NULL; |
| 155 |
cpu->cd.mips.pc_bintrans_paddr_valid = 0; |
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} |
| 157 |
} |
| 158 |
#endif /* MEM_MIPS */ |
| 159 |
|
| 160 |
#ifdef MEM_USERLAND |
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#ifdef MEM_ALPHA |
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paddr = vaddr; |
| 163 |
#else |
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paddr = vaddr & 0x7fffffff; |
| 165 |
#endif |
| 166 |
goto have_paddr; |
| 167 |
#endif |
| 168 |
|
| 169 |
#ifndef MEM_USERLAND |
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#ifdef MEM_MIPS |
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/* |
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* For instruction fetch, are we on the same page as the last |
| 173 |
* instruction we fetched? |
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* |
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* NOTE: There's no need to check this stuff here if this address |
| 176 |
* is known to be in host ram, as it's done at instruction fetch |
| 177 |
* time in cpu.c! Only check if _host_4k_page == NULL. |
| 178 |
*/ |
| 179 |
if (cache == CACHE_INSTRUCTION && |
| 180 |
cpu->cd.mips.pc_last_host_4k_page == NULL && |
| 181 |
(vaddr & ~0xfff) == cpu->cd.mips.pc_last_virtual_page) { |
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paddr = cpu->cd.mips.pc_last_physical_page | (vaddr & 0xfff); |
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goto have_paddr; |
| 184 |
} |
| 185 |
#endif /* MEM_MIPS */ |
| 186 |
|
| 187 |
if (misc_flags & PHYSICAL || cpu->translate_address == NULL) { |
| 188 |
paddr = vaddr; |
| 189 |
#ifdef MEM_ALPHA |
| 190 |
/* paddr &= 0x1fffffff; For testalpha */ |
| 191 |
paddr &= 0x000003ffffffffffULL; |
| 192 |
#endif |
| 193 |
} else { |
| 194 |
ok = cpu->translate_address(cpu, vaddr, &paddr, |
| 195 |
(writeflag? FLAG_WRITEFLAG : 0) + |
| 196 |
(no_exceptions? FLAG_NOEXCEPTIONS : 0) |
| 197 |
#ifdef MEM_X86 |
| 198 |
+ (misc_flags & NO_SEGMENTATION) |
| 199 |
#endif |
| 200 |
#ifdef MEM_ARM |
| 201 |
+ (misc_flags & MEMORY_USER_ACCESS) |
| 202 |
#endif |
| 203 |
+ (cache==CACHE_INSTRUCTION? FLAG_INSTR : 0)); |
| 204 |
/* If the translation caused an exception, or was invalid in |
| 205 |
some way, we simply return without doing the memory |
| 206 |
access: */ |
| 207 |
if (!ok) |
| 208 |
return MEMORY_ACCESS_FAILED; |
| 209 |
} |
| 210 |
|
| 211 |
|
| 212 |
#ifdef MEM_X86 |
| 213 |
/* DOS debugging :-) */ |
| 214 |
if (!quiet_mode && !(misc_flags & PHYSICAL)) { |
| 215 |
if (paddr >= 0x400 && paddr <= 0x4ff) |
| 216 |
debug("{ PC BIOS DATA AREA: %s 0x%x }\n", writeflag == |
| 217 |
MEM_WRITE? "writing to" : "reading from", |
| 218 |
(int)paddr); |
| 219 |
#if 0 |
| 220 |
if (paddr >= 0xf0000 && paddr <= 0xfffff) |
| 221 |
debug("{ BIOS ACCESS: %s 0x%x }\n", |
| 222 |
writeflag == MEM_WRITE? "writing to" : |
| 223 |
"reading from", (int)paddr); |
| 224 |
#endif |
| 225 |
} |
| 226 |
#endif |
| 227 |
|
| 228 |
#ifdef MEM_MIPS |
| 229 |
/* |
| 230 |
* If correct cache emulation is enabled, and we need to simluate |
| 231 |
* cache misses even from the instruction cache, we can't run directly |
| 232 |
* from a host page. :-/ |
| 233 |
*/ |
| 234 |
#if defined(ENABLE_CACHE_EMULATION) && defined(ENABLE_INSTRUCTION_DELAYS) |
| 235 |
#else |
| 236 |
if (cache == CACHE_INSTRUCTION) { |
| 237 |
cpu->cd.mips.pc_last_virtual_page = vaddr & ~0xfff; |
| 238 |
cpu->cd.mips.pc_last_physical_page = paddr & ~0xfff; |
| 239 |
cpu->cd.mips.pc_last_host_4k_page = NULL; |
| 240 |
|
| 241 |
/* _last_host_4k_page will be set to 1 further down, |
| 242 |
if the page is actually in host ram */ |
| 243 |
} |
| 244 |
#endif |
| 245 |
#endif /* MEM_MIPS */ |
| 246 |
#endif /* ifndef MEM_USERLAND */ |
| 247 |
|
| 248 |
|
| 249 |
#if defined(MEM_MIPS) || defined(MEM_USERLAND) |
| 250 |
have_paddr: |
| 251 |
#endif |
| 252 |
|
| 253 |
|
| 254 |
#ifdef MEM_MIPS |
| 255 |
/* TODO: How about bintrans vs cache emulation? */ |
| 256 |
if (bintrans_cached) { |
| 257 |
if (cache == CACHE_INSTRUCTION) { |
| 258 |
cpu->cd.mips.pc_bintrans_paddr_valid = 1; |
| 259 |
cpu->cd.mips.pc_bintrans_paddr = paddr; |
| 260 |
} |
| 261 |
} |
| 262 |
#endif /* MEM_MIPS */ |
| 263 |
|
| 264 |
|
| 265 |
|
| 266 |
#ifndef MEM_USERLAND |
| 267 |
/* |
| 268 |
* Memory mapped device? |
| 269 |
* |
| 270 |
* TODO: this is utterly slow. |
| 271 |
* TODO2: if paddr<base, but len enough, then we should write |
| 272 |
* to a device to |
| 273 |
*/ |
| 274 |
if (paddr >= mem->mmap_dev_minaddr && paddr < mem->mmap_dev_maxaddr) { |
| 275 |
uint64_t orig_paddr = paddr; |
| 276 |
int i, start, res; |
| 277 |
|
| 278 |
/* |
| 279 |
* Really really slow, but unfortunately necessary. This is |
| 280 |
* to avoid the folowing scenario: |
| 281 |
* |
| 282 |
* a) offsets 0x000..0x123 are normal memory |
| 283 |
* b) offsets 0x124..0x777 are a device |
| 284 |
* |
| 285 |
* 1) a read is done from offset 0x100. the page is |
| 286 |
* added to the bintrans system as a "RAM" page |
| 287 |
* 2) a bintranslated read is done from offset 0x200, |
| 288 |
* which should access the device, but since the |
| 289 |
* entire page is added, it will access non-existant |
| 290 |
* RAM instead, without warning. |
| 291 |
* |
| 292 |
* Setting bintrans_device_danger = 1 on accesses which are |
| 293 |
* on _any_ offset on pages that are device mapped avoids |
| 294 |
* this problem, but it is probably not very fast. |
| 295 |
*/ |
| 296 |
for (i=0; i<mem->n_mmapped_devices; i++) |
| 297 |
if (paddr >= (mem->dev_baseaddr[i] & ~offset_mask) && |
| 298 |
paddr <= ((mem->dev_endaddr[i]-1) | offset_mask)) { |
| 299 |
bintrans_device_danger = 1; |
| 300 |
break; |
| 301 |
} |
| 302 |
|
| 303 |
i = start = mem->last_accessed_device; |
| 304 |
|
| 305 |
/* Scan through all devices: */ |
| 306 |
do { |
| 307 |
if (paddr >= mem->dev_baseaddr[i] && |
| 308 |
paddr < mem->dev_endaddr[i]) { |
| 309 |
/* Found a device, let's access it: */ |
| 310 |
mem->last_accessed_device = i; |
| 311 |
|
| 312 |
paddr -= mem->dev_baseaddr[i]; |
| 313 |
if (paddr + len > mem->dev_length[i]) |
| 314 |
len = mem->dev_length[i] - paddr; |
| 315 |
|
| 316 |
if (cpu->update_translation_table != NULL && |
| 317 |
!(ok & MEMORY_NOT_FULL_PAGE) && |
| 318 |
mem->dev_flags[i] & DM_DYNTRANS_OK) { |
| 319 |
int wf = writeflag == MEM_WRITE? 1 : 0; |
| 320 |
unsigned char *host_addr; |
| 321 |
|
| 322 |
if (!(mem->dev_flags[i] & |
| 323 |
DM_DYNTRANS_WRITE_OK)) |
| 324 |
wf = 0; |
| 325 |
|
| 326 |
if (writeflag && wf) { |
| 327 |
if (paddr < mem-> |
| 328 |
dev_dyntrans_write_low[i]) |
| 329 |
mem-> |
| 330 |
dev_dyntrans_write_low |
| 331 |
[i] = paddr & |
| 332 |
~offset_mask; |
| 333 |
if (paddr >= mem-> |
| 334 |
dev_dyntrans_write_high[i]) |
| 335 |
mem-> |
| 336 |
dev_dyntrans_write_high |
| 337 |
[i] = paddr | |
| 338 |
offset_mask; |
| 339 |
} |
| 340 |
|
| 341 |
if (mem->dev_flags[i] & |
| 342 |
DM_EMULATED_RAM) { |
| 343 |
/* MEM_WRITE to force the page |
| 344 |
to be allocated, if it |
| 345 |
wasn't already */ |
| 346 |
uint64_t *pp = (uint64_t *) |
| 347 |
mem->dev_dyntrans_data[i]; |
| 348 |
uint64_t p = orig_paddr - *pp; |
| 349 |
host_addr = |
| 350 |
memory_paddr_to_hostaddr( |
| 351 |
mem, p, MEM_WRITE) |
| 352 |
+ (p & ~offset_mask |
| 353 |
& ((1 << |
| 354 |
BITS_PER_MEMBLOCK) - 1)); |
| 355 |
} else { |
| 356 |
host_addr = |
| 357 |
mem->dev_dyntrans_data[i] + |
| 358 |
(paddr & ~offset_mask); |
| 359 |
} |
| 360 |
cpu->update_translation_table(cpu, |
| 361 |
vaddr & ~offset_mask, host_addr, |
| 362 |
wf, orig_paddr & ~offset_mask); |
| 363 |
} |
| 364 |
|
| 365 |
res = 0; |
| 366 |
if (!no_exceptions || (mem->dev_flags[i] & |
| 367 |
DM_READS_HAVE_NO_SIDE_EFFECTS)) |
| 368 |
res = mem->dev_f[i](cpu, mem, paddr, |
| 369 |
data, len, writeflag, |
| 370 |
mem->dev_extra[i]); |
| 371 |
|
| 372 |
#ifdef ENABLE_INSTRUCTION_DELAYS |
| 373 |
if (res == 0) |
| 374 |
res = -1; |
| 375 |
|
| 376 |
#ifdef MEM_MIPS |
| 377 |
cpu->cd.mips.instruction_delay += |
| 378 |
( (abs(res) - 1) * |
| 379 |
cpu->cd.mips.cpu_type.instrs_per_cycle ); |
| 380 |
#endif |
| 381 |
#endif |
| 382 |
|
| 383 |
#ifndef MEM_X86 |
| 384 |
/* |
| 385 |
* If accessing the memory mapped device |
| 386 |
* failed, then return with a DBE exception. |
| 387 |
*/ |
| 388 |
if (res <= 0 && !no_exceptions) { |
| 389 |
debug("%s device '%s' addr %08lx " |
| 390 |
"failed\n", writeflag? |
| 391 |
"writing to" : "reading from", |
| 392 |
mem->dev_name[i], (long)paddr); |
| 393 |
#ifdef MEM_MIPS |
| 394 |
mips_cpu_exception(cpu, EXCEPTION_DBE, |
| 395 |
0, vaddr, 0, 0, 0, 0); |
| 396 |
#endif |
| 397 |
return MEMORY_ACCESS_FAILED; |
| 398 |
} |
| 399 |
#endif |
| 400 |
goto do_return_ok; |
| 401 |
} |
| 402 |
|
| 403 |
i ++; |
| 404 |
if (i == mem->n_mmapped_devices) |
| 405 |
i = 0; |
| 406 |
} while (i != start); |
| 407 |
} |
| 408 |
|
| 409 |
|
| 410 |
#ifdef MEM_MIPS |
| 411 |
/* |
| 412 |
* Data and instruction cache emulation: |
| 413 |
*/ |
| 414 |
|
| 415 |
switch (cpu->cd.mips.cpu_type.mmu_model) { |
| 416 |
case MMU3K: |
| 417 |
/* if not uncached addess (TODO: generalize this) */ |
| 418 |
if (!(misc_flags & PHYSICAL) && cache != CACHE_NONE && |
| 419 |
!((vaddr & 0xffffffffULL) >= 0xa0000000ULL && |
| 420 |
(vaddr & 0xffffffffULL) <= 0xbfffffffULL)) { |
| 421 |
if (memory_cache_R3000(cpu, cache, paddr, |
| 422 |
writeflag, len, data)) |
| 423 |
goto do_return_ok; |
| 424 |
} |
| 425 |
break; |
| 426 |
default: |
| 427 |
/* R4000 etc */ |
| 428 |
/* TODO */ |
| 429 |
; |
| 430 |
} |
| 431 |
#endif /* MEM_MIPS */ |
| 432 |
|
| 433 |
|
| 434 |
/* Outside of physical RAM? */ |
| 435 |
if (paddr >= mem->physical_max) { |
| 436 |
#ifdef MEM_MIPS |
| 437 |
if ((paddr & 0xffffc00000ULL) == 0x1fc00000) { |
| 438 |
/* Ok, this is PROM stuff */ |
| 439 |
} else if ((paddr & 0xfffff00000ULL) == 0x1ff00000) { |
| 440 |
/* Sprite reads from this area of memory... */ |
| 441 |
/* TODO: is this still correct? */ |
| 442 |
if (writeflag == MEM_READ) |
| 443 |
memset(data, 0, len); |
| 444 |
goto do_return_ok; |
| 445 |
} else |
| 446 |
#endif /* MIPS */ |
| 447 |
{ |
| 448 |
if (paddr >= mem->physical_max) { |
| 449 |
char *symbol; |
| 450 |
uint64_t offset; |
| 451 |
#ifdef MEM_MIPS |
| 452 |
uint64_t old_pc = cpu->cd.mips.pc_last; |
| 453 |
#else |
| 454 |
uint64_t old_pc = cpu->pc; |
| 455 |
#endif |
| 456 |
|
| 457 |
/* This allows for example OS kernels to probe |
| 458 |
memory a few KBs past the end of memory, |
| 459 |
without giving too many warnings. */ |
| 460 |
if (!quiet_mode && !no_exceptions && paddr >= |
| 461 |
mem->physical_max + 0x40000) { |
| 462 |
fatal("[ memory_rw(): writeflag=%i ", |
| 463 |
writeflag); |
| 464 |
if (writeflag) { |
| 465 |
unsigned int i; |
| 466 |
debug("data={", writeflag); |
| 467 |
if (len > 16) { |
| 468 |
int start2 = len-16; |
| 469 |
for (i=0; i<16; i++) |
| 470 |
debug("%s%02x", |
| 471 |
i?",":"", |
| 472 |
data[i]); |
| 473 |
debug(" .. "); |
| 474 |
if (start2 < 16) |
| 475 |
start2 = 16; |
| 476 |
for (i=start2; i<len; |
| 477 |
i++) |
| 478 |
debug("%s%02x", |
| 479 |
i?",":"", |
| 480 |
data[i]); |
| 481 |
} else |
| 482 |
for (i=0; i<len; i++) |
| 483 |
debug("%s%02x", |
| 484 |
i?",":"", |
| 485 |
data[i]); |
| 486 |
debug("}"); |
| 487 |
} |
| 488 |
|
| 489 |
fatal(" paddr=0x%llx >= physical_max" |
| 490 |
"; pc=", (long long)paddr); |
| 491 |
if (cpu->is_32bit) |
| 492 |
fatal("0x%08x",(int)old_pc); |
| 493 |
else |
| 494 |
fatal("0x%016llx", |
| 495 |
(long long)old_pc); |
| 496 |
symbol = get_symbol_name( |
| 497 |
&cpu->machine->symbol_context, |
| 498 |
old_pc, &offset); |
| 499 |
fatal(" <%s> ]\n", |
| 500 |
symbol? symbol : " no symbol "); |
| 501 |
} |
| 502 |
|
| 503 |
if (cpu->machine->single_step_on_bad_addr) { |
| 504 |
fatal("[ unimplemented access to " |
| 505 |
"0x%llx, pc=0x",(long long)paddr); |
| 506 |
if (cpu->is_32bit) |
| 507 |
fatal("%08x ]\n", |
| 508 |
(int)old_pc); |
| 509 |
else |
| 510 |
fatal("%016llx ]\n", |
| 511 |
(long long)old_pc); |
| 512 |
single_step = 1; |
| 513 |
} |
| 514 |
} |
| 515 |
|
| 516 |
if (writeflag == MEM_READ) { |
| 517 |
#ifdef MEM_X86 |
| 518 |
/* Reading non-existant memory on x86: */ |
| 519 |
memset(data, 0xff, len); |
| 520 |
#else |
| 521 |
/* Return all zeroes? (Or 0xff? TODO) */ |
| 522 |
memset(data, 0, len); |
| 523 |
#endif |
| 524 |
|
| 525 |
#ifdef MEM_MIPS |
| 526 |
/* |
| 527 |
* For real data/instruction accesses, cause |
| 528 |
* an exceptions on an illegal read: |
| 529 |
*/ |
| 530 |
if (cache != CACHE_NONE && cpu->machine-> |
| 531 |
dbe_on_nonexistant_memaccess && |
| 532 |
!no_exceptions) { |
| 533 |
if (paddr >= mem->physical_max && |
| 534 |
paddr < mem->physical_max+1048576) |
| 535 |
mips_cpu_exception(cpu, |
| 536 |
EXCEPTION_DBE, 0, vaddr, 0, |
| 537 |
0, 0, 0); |
| 538 |
} |
| 539 |
#endif /* MEM_MIPS */ |
| 540 |
} |
| 541 |
|
| 542 |
/* Hm? Shouldn't there be a DBE exception for |
| 543 |
invalid writes as well? TODO */ |
| 544 |
|
| 545 |
goto do_return_ok; |
| 546 |
} |
| 547 |
} |
| 548 |
|
| 549 |
#endif /* ifndef MEM_USERLAND */ |
| 550 |
|
| 551 |
|
| 552 |
/* |
| 553 |
* Uncached access: |
| 554 |
* |
| 555 |
* 1) Translate the physical address to a host address. |
| 556 |
* |
| 557 |
* 2) Insert this virtual->physical->host translation into the |
| 558 |
* fast translation arrays (using update_translation_table()). |
| 559 |
* |
| 560 |
* 3) If this was a Write, then invalidate any code translations |
| 561 |
* in that page. |
| 562 |
*/ |
| 563 |
memblock = memory_paddr_to_hostaddr(mem, paddr, writeflag); |
| 564 |
if (memblock == NULL) { |
| 565 |
if (writeflag == MEM_READ) |
| 566 |
memset(data, 0, len); |
| 567 |
goto do_return_ok; |
| 568 |
} |
| 569 |
|
| 570 |
offset = paddr & ((1 << BITS_PER_MEMBLOCK) - 1); |
| 571 |
|
| 572 |
if (cpu->update_translation_table != NULL && !bintrans_device_danger |
| 573 |
#ifndef MEM_MIPS |
| 574 |
/* && !(misc_flags & MEMORY_USER_ACCESS) */ |
| 575 |
#ifndef MEM_USERLAND |
| 576 |
&& !(ok & MEMORY_NOT_FULL_PAGE) |
| 577 |
#endif |
| 578 |
#endif |
| 579 |
&& !no_exceptions) |
| 580 |
cpu->update_translation_table(cpu, vaddr & ~offset_mask, |
| 581 |
memblock + (offset & ~offset_mask), |
| 582 |
(misc_flags & MEMORY_USER_ACCESS) | |
| 583 |
#ifndef MEM_MIPS |
| 584 |
(cache == CACHE_INSTRUCTION? TLB_CODE : 0) | |
| 585 |
#endif |
| 586 |
#if !defined(MEM_MIPS) && !defined(MEM_USERLAND) |
| 587 |
(cache == CACHE_INSTRUCTION? |
| 588 |
(writeflag == MEM_WRITE? 1 : 0) : ok - 1), |
| 589 |
#else |
| 590 |
(writeflag == MEM_WRITE? 1 : 0), |
| 591 |
#endif |
| 592 |
paddr & ~offset_mask); |
| 593 |
|
| 594 |
/* Invalidate code translations for the page we are writing to. */ |
| 595 |
if (writeflag == MEM_WRITE && cpu->invalidate_code_translation != NULL) |
| 596 |
cpu->invalidate_code_translation(cpu, paddr, INVALIDATE_PADDR); |
| 597 |
|
| 598 |
if (writeflag == MEM_WRITE) { |
| 599 |
/* Ugly optimization, but it works: */ |
| 600 |
if (len == sizeof(uint32_t) && (offset & 3)==0 |
| 601 |
&& ((size_t)data&3)==0) |
| 602 |
*(uint32_t *)(memblock + offset) = *(uint32_t *)data; |
| 603 |
else if (len == sizeof(uint8_t)) |
| 604 |
*(uint8_t *)(memblock + offset) = *(uint8_t *)data; |
| 605 |
else |
| 606 |
memcpy(memblock + offset, data, len); |
| 607 |
} else { |
| 608 |
/* Ugly optimization, but it works: */ |
| 609 |
if (len == sizeof(uint32_t) && (offset & 3)==0 |
| 610 |
&& ((size_t)data&3)==0) |
| 611 |
*(uint32_t *)data = *(uint32_t *)(memblock + offset); |
| 612 |
else if (len == sizeof(uint8_t)) |
| 613 |
*(uint8_t *)data = *(uint8_t *)(memblock + offset); |
| 614 |
else |
| 615 |
memcpy(data, memblock + offset, len); |
| 616 |
|
| 617 |
#ifdef MEM_MIPS |
| 618 |
if (cache == CACHE_INSTRUCTION) { |
| 619 |
cpu->cd.mips.pc_last_host_4k_page = memblock |
| 620 |
+ (offset & ~offset_mask); |
| 621 |
if (bintrans_cached) { |
| 622 |
cpu->cd.mips.pc_bintrans_host_4kpage = |
| 623 |
cpu->cd.mips.pc_last_host_4k_page; |
| 624 |
} |
| 625 |
} |
| 626 |
#endif /* MIPS */ |
| 627 |
} |
| 628 |
|
| 629 |
|
| 630 |
do_return_ok: |
| 631 |
return MEMORY_ACCESS_OK; |
| 632 |
} |
| 633 |
|
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