| 1 | /* Caching code for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1992-1993, 1995-1996, 1998-2001, 2003, 2007-2012 Free |
| 4 | Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "dcache.h" |
| 23 | #include "gdbcmd.h" |
| 24 | #include "gdb_string.h" |
| 25 | #include "gdbcore.h" |
| 26 | #include "target.h" |
| 27 | #include "inferior.h" |
| 28 | #include "splay-tree.h" |
| 29 | |
| 30 | /* Commands with a prefix of `{set,show} dcache'. */ |
| 31 | static struct cmd_list_element *dcache_set_list = NULL; |
| 32 | static struct cmd_list_element *dcache_show_list = NULL; |
| 33 | |
| 34 | /* The data cache could lead to incorrect results because it doesn't |
| 35 | know about volatile variables, thus making it impossible to debug |
| 36 | functions which use memory mapped I/O devices. Set the nocache |
| 37 | memory region attribute in those cases. |
| 38 | |
| 39 | In general the dcache speeds up performance. Some speed improvement |
| 40 | comes from the actual caching mechanism, but the major gain is in |
| 41 | the reduction of the remote protocol overhead; instead of reading |
| 42 | or writing a large area of memory in 4 byte requests, the cache |
| 43 | bundles up the requests into LINE_SIZE chunks, reducing overhead |
| 44 | significantly. This is most useful when accessing a large amount |
| 45 | of data, such as when performing a backtrace. |
| 46 | |
| 47 | The cache is a splay tree along with a linked list for replacement. |
| 48 | Each block caches a LINE_SIZE area of memory. Within each line we |
| 49 | remember the address of the line (which must be a multiple of |
| 50 | LINE_SIZE) and the actual data block. |
| 51 | |
| 52 | Lines are only allocated as needed, so DCACHE_SIZE really specifies the |
| 53 | *maximum* number of lines in the cache. |
| 54 | |
| 55 | At present, the cache is write-through rather than writeback: as soon |
| 56 | as data is written to the cache, it is also immediately written to |
| 57 | the target. Therefore, cache lines are never "dirty". Whether a given |
| 58 | line is valid or not depends on where it is stored in the dcache_struct; |
| 59 | there is no per-block valid flag. */ |
| 60 | |
| 61 | /* NOTE: Interaction of dcache and memory region attributes |
| 62 | |
| 63 | As there is no requirement that memory region attributes be aligned |
| 64 | to or be a multiple of the dcache page size, dcache_read_line() and |
| 65 | dcache_write_line() must break up the page by memory region. If a |
| 66 | chunk does not have the cache attribute set, an invalid memory type |
| 67 | is set, etc., then the chunk is skipped. Those chunks are handled |
| 68 | in target_xfer_memory() (or target_xfer_memory_partial()). |
| 69 | |
| 70 | This doesn't occur very often. The most common occurance is when |
| 71 | the last bit of the .text segment and the first bit of the .data |
| 72 | segment fall within the same dcache page with a ro/cacheable memory |
| 73 | region defined for the .text segment and a rw/non-cacheable memory |
| 74 | region defined for the .data segment. */ |
| 75 | |
| 76 | /* The maximum number of lines stored. The total size of the cache is |
| 77 | equal to DCACHE_SIZE times LINE_SIZE. */ |
| 78 | #define DCACHE_DEFAULT_SIZE 4096 |
| 79 | static unsigned dcache_size = DCACHE_DEFAULT_SIZE; |
| 80 | |
| 81 | /* The default size of a cache line. Smaller values reduce the time taken to |
| 82 | read a single byte and make the cache more granular, but increase |
| 83 | overhead and reduce the effectiveness of the cache as a prefetcher. */ |
| 84 | #define DCACHE_DEFAULT_LINE_SIZE 64 |
| 85 | static unsigned dcache_line_size = DCACHE_DEFAULT_LINE_SIZE; |
| 86 | |
| 87 | /* Each cache block holds LINE_SIZE bytes of data |
| 88 | starting at a multiple-of-LINE_SIZE address. */ |
| 89 | |
| 90 | #define LINE_SIZE_MASK(dcache) ((dcache->line_size - 1)) |
| 91 | #define XFORM(dcache, x) ((x) & LINE_SIZE_MASK (dcache)) |
| 92 | #define MASK(dcache, x) ((x) & ~LINE_SIZE_MASK (dcache)) |
| 93 | |
| 94 | struct dcache_block |
| 95 | { |
| 96 | /* For least-recently-allocated and free lists. */ |
| 97 | struct dcache_block *prev; |
| 98 | struct dcache_block *next; |
| 99 | |
| 100 | CORE_ADDR addr; /* address of data */ |
| 101 | int refs; /* # hits */ |
| 102 | gdb_byte data[1]; /* line_size bytes at given address */ |
| 103 | }; |
| 104 | |
| 105 | struct dcache_struct |
| 106 | { |
| 107 | splay_tree tree; |
| 108 | struct dcache_block *oldest; /* least-recently-allocated list. */ |
| 109 | |
| 110 | /* The free list is maintained identically to OLDEST to simplify |
| 111 | the code: we only need one set of accessors. */ |
| 112 | struct dcache_block *freelist; |
| 113 | |
| 114 | /* The number of in-use lines in the cache. */ |
| 115 | int size; |
| 116 | CORE_ADDR line_size; /* current line_size. */ |
| 117 | |
| 118 | /* The ptid of last inferior to use cache or null_ptid. */ |
| 119 | ptid_t ptid; |
| 120 | }; |
| 121 | |
| 122 | typedef void (block_func) (struct dcache_block *block, void *param); |
| 123 | |
| 124 | static struct dcache_block *dcache_hit (DCACHE *dcache, CORE_ADDR addr); |
| 125 | |
| 126 | static int dcache_read_line (DCACHE *dcache, struct dcache_block *db); |
| 127 | |
| 128 | static struct dcache_block *dcache_alloc (DCACHE *dcache, CORE_ADDR addr); |
| 129 | |
| 130 | static void dcache_info (char *exp, int tty); |
| 131 | |
| 132 | void _initialize_dcache (void); |
| 133 | |
| 134 | static int dcache_enabled_p = 0; /* OBSOLETE */ |
| 135 | |
| 136 | static void |
| 137 | show_dcache_enabled_p (struct ui_file *file, int from_tty, |
| 138 | struct cmd_list_element *c, const char *value) |
| 139 | { |
| 140 | fprintf_filtered (file, _("Deprecated remotecache flag is %s.\n"), value); |
| 141 | } |
| 142 | |
| 143 | static DCACHE *last_cache; /* Used by info dcache. */ |
| 144 | |
| 145 | /* Add BLOCK to circular block list BLIST, behind the block at *BLIST. |
| 146 | *BLIST is not updated (unless it was previously NULL of course). |
| 147 | This is for the least-recently-allocated list's sake: |
| 148 | BLIST points to the oldest block. |
| 149 | ??? This makes for poor cache usage of the free list, |
| 150 | but is it measurable? */ |
| 151 | |
| 152 | static void |
| 153 | append_block (struct dcache_block **blist, struct dcache_block *block) |
| 154 | { |
| 155 | if (*blist) |
| 156 | { |
| 157 | block->next = *blist; |
| 158 | block->prev = (*blist)->prev; |
| 159 | block->prev->next = block; |
| 160 | (*blist)->prev = block; |
| 161 | /* We don't update *BLIST here to maintain the invariant that for the |
| 162 | least-recently-allocated list *BLIST points to the oldest block. */ |
| 163 | } |
| 164 | else |
| 165 | { |
| 166 | block->next = block; |
| 167 | block->prev = block; |
| 168 | *blist = block; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | /* Remove BLOCK from circular block list BLIST. */ |
| 173 | |
| 174 | static void |
| 175 | remove_block (struct dcache_block **blist, struct dcache_block *block) |
| 176 | { |
| 177 | if (block->next == block) |
| 178 | { |
| 179 | *blist = NULL; |
| 180 | } |
| 181 | else |
| 182 | { |
| 183 | block->next->prev = block->prev; |
| 184 | block->prev->next = block->next; |
| 185 | /* If we removed the block *BLIST points to, shift it to the next block |
| 186 | to maintain the invariant that for the least-recently-allocated list |
| 187 | *BLIST points to the oldest block. */ |
| 188 | if (*blist == block) |
| 189 | *blist = block->next; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | /* Iterate over all elements in BLIST, calling FUNC. |
| 194 | PARAM is passed to FUNC. |
| 195 | FUNC may remove the block it's passed, but only that block. */ |
| 196 | |
| 197 | static void |
| 198 | for_each_block (struct dcache_block **blist, block_func *func, void *param) |
| 199 | { |
| 200 | struct dcache_block *db; |
| 201 | |
| 202 | if (*blist == NULL) |
| 203 | return; |
| 204 | |
| 205 | db = *blist; |
| 206 | do |
| 207 | { |
| 208 | struct dcache_block *next = db->next; |
| 209 | |
| 210 | func (db, param); |
| 211 | db = next; |
| 212 | } |
| 213 | while (*blist && db != *blist); |
| 214 | } |
| 215 | |
| 216 | /* BLOCK_FUNC routine for dcache_free. */ |
| 217 | |
| 218 | static void |
| 219 | free_block (struct dcache_block *block, void *param) |
| 220 | { |
| 221 | xfree (block); |
| 222 | } |
| 223 | |
| 224 | /* Free a data cache. */ |
| 225 | |
| 226 | void |
| 227 | dcache_free (DCACHE *dcache) |
| 228 | { |
| 229 | if (last_cache == dcache) |
| 230 | last_cache = NULL; |
| 231 | |
| 232 | splay_tree_delete (dcache->tree); |
| 233 | for_each_block (&dcache->oldest, free_block, NULL); |
| 234 | for_each_block (&dcache->freelist, free_block, NULL); |
| 235 | xfree (dcache); |
| 236 | } |
| 237 | |
| 238 | |
| 239 | /* BLOCK_FUNC function for dcache_invalidate. |
| 240 | This doesn't remove the block from the oldest list on purpose. |
| 241 | dcache_invalidate will do it later. */ |
| 242 | |
| 243 | static void |
| 244 | invalidate_block (struct dcache_block *block, void *param) |
| 245 | { |
| 246 | DCACHE *dcache = (DCACHE *) param; |
| 247 | |
| 248 | splay_tree_remove (dcache->tree, (splay_tree_key) block->addr); |
| 249 | append_block (&dcache->freelist, block); |
| 250 | } |
| 251 | |
| 252 | /* Free all the data cache blocks, thus discarding all cached data. */ |
| 253 | |
| 254 | void |
| 255 | dcache_invalidate (DCACHE *dcache) |
| 256 | { |
| 257 | for_each_block (&dcache->oldest, invalidate_block, dcache); |
| 258 | |
| 259 | dcache->oldest = NULL; |
| 260 | dcache->size = 0; |
| 261 | dcache->ptid = null_ptid; |
| 262 | |
| 263 | if (dcache->line_size != dcache_line_size) |
| 264 | { |
| 265 | /* We've been asked to use a different line size. |
| 266 | All of our freelist blocks are now the wrong size, so free them. */ |
| 267 | |
| 268 | for_each_block (&dcache->freelist, free_block, dcache); |
| 269 | dcache->freelist = NULL; |
| 270 | dcache->line_size = dcache_line_size; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /* Invalidate the line associated with ADDR. */ |
| 275 | |
| 276 | static void |
| 277 | dcache_invalidate_line (DCACHE *dcache, CORE_ADDR addr) |
| 278 | { |
| 279 | struct dcache_block *db = dcache_hit (dcache, addr); |
| 280 | |
| 281 | if (db) |
| 282 | { |
| 283 | splay_tree_remove (dcache->tree, (splay_tree_key) db->addr); |
| 284 | remove_block (&dcache->oldest, db); |
| 285 | append_block (&dcache->freelist, db); |
| 286 | --dcache->size; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | /* If addr is present in the dcache, return the address of the block |
| 291 | containing it. Otherwise return NULL. */ |
| 292 | |
| 293 | static struct dcache_block * |
| 294 | dcache_hit (DCACHE *dcache, CORE_ADDR addr) |
| 295 | { |
| 296 | struct dcache_block *db; |
| 297 | |
| 298 | splay_tree_node node = splay_tree_lookup (dcache->tree, |
| 299 | (splay_tree_key) MASK (dcache, addr)); |
| 300 | |
| 301 | if (!node) |
| 302 | return NULL; |
| 303 | |
| 304 | db = (struct dcache_block *) node->value; |
| 305 | db->refs++; |
| 306 | return db; |
| 307 | } |
| 308 | |
| 309 | /* Fill a cache line from target memory. |
| 310 | The result is 1 for success, 0 if the (entire) cache line |
| 311 | wasn't readable. */ |
| 312 | |
| 313 | static int |
| 314 | dcache_read_line (DCACHE *dcache, struct dcache_block *db) |
| 315 | { |
| 316 | CORE_ADDR memaddr; |
| 317 | gdb_byte *myaddr; |
| 318 | int len; |
| 319 | int res; |
| 320 | int reg_len; |
| 321 | struct mem_region *region; |
| 322 | |
| 323 | len = dcache->line_size; |
| 324 | memaddr = db->addr; |
| 325 | myaddr = db->data; |
| 326 | |
| 327 | while (len > 0) |
| 328 | { |
| 329 | /* Don't overrun if this block is right at the end of the region. */ |
| 330 | region = lookup_mem_region (memaddr); |
| 331 | if (region->hi == 0 || memaddr + len < region->hi) |
| 332 | reg_len = len; |
| 333 | else |
| 334 | reg_len = region->hi - memaddr; |
| 335 | |
| 336 | /* Skip non-readable regions. The cache attribute can be ignored, |
| 337 | since we may be loading this for a stack access. */ |
| 338 | if (region->attrib.mode == MEM_WO) |
| 339 | { |
| 340 | memaddr += reg_len; |
| 341 | myaddr += reg_len; |
| 342 | len -= reg_len; |
| 343 | continue; |
| 344 | } |
| 345 | |
| 346 | res = target_read (¤t_target, TARGET_OBJECT_RAW_MEMORY, |
| 347 | NULL, myaddr, memaddr, reg_len); |
| 348 | if (res < reg_len) |
| 349 | return 0; |
| 350 | |
| 351 | memaddr += res; |
| 352 | myaddr += res; |
| 353 | len -= res; |
| 354 | } |
| 355 | |
| 356 | return 1; |
| 357 | } |
| 358 | |
| 359 | /* Get a free cache block, put or keep it on the valid list, |
| 360 | and return its address. */ |
| 361 | |
| 362 | static struct dcache_block * |
| 363 | dcache_alloc (DCACHE *dcache, CORE_ADDR addr) |
| 364 | { |
| 365 | struct dcache_block *db; |
| 366 | |
| 367 | if (dcache->size >= dcache_size) |
| 368 | { |
| 369 | /* Evict the least recently allocated line. */ |
| 370 | db = dcache->oldest; |
| 371 | remove_block (&dcache->oldest, db); |
| 372 | |
| 373 | splay_tree_remove (dcache->tree, (splay_tree_key) db->addr); |
| 374 | } |
| 375 | else |
| 376 | { |
| 377 | db = dcache->freelist; |
| 378 | if (db) |
| 379 | remove_block (&dcache->freelist, db); |
| 380 | else |
| 381 | db = xmalloc (offsetof (struct dcache_block, data) + |
| 382 | dcache->line_size); |
| 383 | |
| 384 | dcache->size++; |
| 385 | } |
| 386 | |
| 387 | db->addr = MASK (dcache, addr); |
| 388 | db->refs = 0; |
| 389 | |
| 390 | /* Put DB at the end of the list, it's the newest. */ |
| 391 | append_block (&dcache->oldest, db); |
| 392 | |
| 393 | splay_tree_insert (dcache->tree, (splay_tree_key) db->addr, |
| 394 | (splay_tree_value) db); |
| 395 | |
| 396 | return db; |
| 397 | } |
| 398 | |
| 399 | /* Using the data cache DCACHE, store in *PTR the contents of the byte at |
| 400 | address ADDR in the remote machine. |
| 401 | |
| 402 | Returns 1 for success, 0 for error. */ |
| 403 | |
| 404 | static int |
| 405 | dcache_peek_byte (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr) |
| 406 | { |
| 407 | struct dcache_block *db = dcache_hit (dcache, addr); |
| 408 | |
| 409 | if (!db) |
| 410 | { |
| 411 | db = dcache_alloc (dcache, addr); |
| 412 | |
| 413 | if (!dcache_read_line (dcache, db)) |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | *ptr = db->data[XFORM (dcache, addr)]; |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | /* Write the byte at PTR into ADDR in the data cache. |
| 422 | |
| 423 | The caller is responsible for also promptly writing the data |
| 424 | through to target memory. |
| 425 | |
| 426 | If addr is not in cache, this function does nothing; writing to |
| 427 | an area of memory which wasn't present in the cache doesn't cause |
| 428 | it to be loaded in. |
| 429 | |
| 430 | Always return 1 (meaning success) to simplify dcache_xfer_memory. */ |
| 431 | |
| 432 | static int |
| 433 | dcache_poke_byte (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr) |
| 434 | { |
| 435 | struct dcache_block *db = dcache_hit (dcache, addr); |
| 436 | |
| 437 | if (db) |
| 438 | db->data[XFORM (dcache, addr)] = *ptr; |
| 439 | |
| 440 | return 1; |
| 441 | } |
| 442 | |
| 443 | static int |
| 444 | dcache_splay_tree_compare (splay_tree_key a, splay_tree_key b) |
| 445 | { |
| 446 | if (a > b) |
| 447 | return 1; |
| 448 | else if (a == b) |
| 449 | return 0; |
| 450 | else |
| 451 | return -1; |
| 452 | } |
| 453 | |
| 454 | /* Allocate and initialize a data cache. */ |
| 455 | |
| 456 | DCACHE * |
| 457 | dcache_init (void) |
| 458 | { |
| 459 | DCACHE *dcache; |
| 460 | |
| 461 | dcache = (DCACHE *) xmalloc (sizeof (*dcache)); |
| 462 | |
| 463 | dcache->tree = splay_tree_new (dcache_splay_tree_compare, |
| 464 | NULL, |
| 465 | NULL); |
| 466 | |
| 467 | dcache->oldest = NULL; |
| 468 | dcache->freelist = NULL; |
| 469 | dcache->size = 0; |
| 470 | dcache->line_size = dcache_line_size; |
| 471 | dcache->ptid = null_ptid; |
| 472 | last_cache = dcache; |
| 473 | |
| 474 | return dcache; |
| 475 | } |
| 476 | |
| 477 | |
| 478 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring |
| 479 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
| 480 | nonzero. |
| 481 | |
| 482 | Return the number of bytes actually transfered, or -1 if the |
| 483 | transfer is not supported or otherwise fails. Return of a non-negative |
| 484 | value less than LEN indicates that no further transfer is possible. |
| 485 | NOTE: This is different than the to_xfer_partial interface, in which |
| 486 | positive values less than LEN mean further transfers may be possible. */ |
| 487 | |
| 488 | int |
| 489 | dcache_xfer_memory (struct target_ops *ops, DCACHE *dcache, |
| 490 | CORE_ADDR memaddr, gdb_byte *myaddr, |
| 491 | int len, int should_write) |
| 492 | { |
| 493 | int i; |
| 494 | int res; |
| 495 | int (*xfunc) (DCACHE *dcache, CORE_ADDR addr, gdb_byte *ptr); |
| 496 | |
| 497 | xfunc = should_write ? dcache_poke_byte : dcache_peek_byte; |
| 498 | |
| 499 | /* If this is a different inferior from what we've recorded, |
| 500 | flush the cache. */ |
| 501 | |
| 502 | if (! ptid_equal (inferior_ptid, dcache->ptid)) |
| 503 | { |
| 504 | dcache_invalidate (dcache); |
| 505 | dcache->ptid = inferior_ptid; |
| 506 | } |
| 507 | |
| 508 | /* Do write-through first, so that if it fails, we don't write to |
| 509 | the cache at all. */ |
| 510 | |
| 511 | if (should_write) |
| 512 | { |
| 513 | res = target_write (ops, TARGET_OBJECT_RAW_MEMORY, |
| 514 | NULL, myaddr, memaddr, len); |
| 515 | if (res <= 0) |
| 516 | return res; |
| 517 | /* Update LEN to what was actually written. */ |
| 518 | len = res; |
| 519 | } |
| 520 | |
| 521 | for (i = 0; i < len; i++) |
| 522 | { |
| 523 | if (!xfunc (dcache, memaddr + i, myaddr + i)) |
| 524 | { |
| 525 | /* That failed. Discard its cache line so we don't have a |
| 526 | partially read line. */ |
| 527 | dcache_invalidate_line (dcache, memaddr + i); |
| 528 | /* If we're writing, we still wrote LEN bytes. */ |
| 529 | if (should_write) |
| 530 | return len; |
| 531 | else |
| 532 | return i; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | return len; |
| 537 | } |
| 538 | |
| 539 | /* FIXME: There would be some benefit to making the cache write-back and |
| 540 | moving the writeback operation to a higher layer, as it could occur |
| 541 | after a sequence of smaller writes have been completed (as when a stack |
| 542 | frame is constructed for an inferior function call). Note that only |
| 543 | moving it up one level to target_xfer_memory[_partial]() is not |
| 544 | sufficient since we want to coalesce memory transfers that are |
| 545 | "logically" connected but not actually a single call to one of the |
| 546 | memory transfer functions. */ |
| 547 | |
| 548 | /* Just update any cache lines which are already present. This is called |
| 549 | by memory_xfer_partial in cases where the access would otherwise not go |
| 550 | through the cache. */ |
| 551 | |
| 552 | void |
| 553 | dcache_update (DCACHE *dcache, CORE_ADDR memaddr, gdb_byte *myaddr, int len) |
| 554 | { |
| 555 | int i; |
| 556 | |
| 557 | for (i = 0; i < len; i++) |
| 558 | dcache_poke_byte (dcache, memaddr + i, myaddr + i); |
| 559 | } |
| 560 | |
| 561 | static void |
| 562 | dcache_print_line (int index) |
| 563 | { |
| 564 | splay_tree_node n; |
| 565 | struct dcache_block *db; |
| 566 | int i, j; |
| 567 | |
| 568 | if (!last_cache) |
| 569 | { |
| 570 | printf_filtered (_("No data cache available.\n")); |
| 571 | return; |
| 572 | } |
| 573 | |
| 574 | n = splay_tree_min (last_cache->tree); |
| 575 | |
| 576 | for (i = index; i > 0; --i) |
| 577 | { |
| 578 | if (!n) |
| 579 | break; |
| 580 | n = splay_tree_successor (last_cache->tree, n->key); |
| 581 | } |
| 582 | |
| 583 | if (!n) |
| 584 | { |
| 585 | printf_filtered (_("No such cache line exists.\n")); |
| 586 | return; |
| 587 | } |
| 588 | |
| 589 | db = (struct dcache_block *) n->value; |
| 590 | |
| 591 | printf_filtered (_("Line %d: address %s [%d hits]\n"), |
| 592 | index, paddress (target_gdbarch, db->addr), db->refs); |
| 593 | |
| 594 | for (j = 0; j < last_cache->line_size; j++) |
| 595 | { |
| 596 | printf_filtered ("%02x ", db->data[j]); |
| 597 | |
| 598 | /* Print a newline every 16 bytes (48 characters). */ |
| 599 | if ((j % 16 == 15) && (j != last_cache->line_size - 1)) |
| 600 | printf_filtered ("\n"); |
| 601 | } |
| 602 | printf_filtered ("\n"); |
| 603 | } |
| 604 | |
| 605 | static void |
| 606 | dcache_info (char *exp, int tty) |
| 607 | { |
| 608 | splay_tree_node n; |
| 609 | int i, refcount; |
| 610 | |
| 611 | if (exp) |
| 612 | { |
| 613 | char *linestart; |
| 614 | |
| 615 | i = strtol (exp, &linestart, 10); |
| 616 | if (linestart == exp || i < 0) |
| 617 | { |
| 618 | printf_filtered (_("Usage: info dcache [linenumber]\n")); |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | dcache_print_line (i); |
| 623 | return; |
| 624 | } |
| 625 | |
| 626 | printf_filtered (_("Dcache %u lines of %u bytes each.\n"), |
| 627 | dcache_size, |
| 628 | last_cache ? (unsigned) last_cache->line_size |
| 629 | : dcache_line_size); |
| 630 | |
| 631 | if (!last_cache || ptid_equal (last_cache->ptid, null_ptid)) |
| 632 | { |
| 633 | printf_filtered (_("No data cache available.\n")); |
| 634 | return; |
| 635 | } |
| 636 | |
| 637 | printf_filtered (_("Contains data for %s\n"), |
| 638 | target_pid_to_str (last_cache->ptid)); |
| 639 | |
| 640 | refcount = 0; |
| 641 | |
| 642 | n = splay_tree_min (last_cache->tree); |
| 643 | i = 0; |
| 644 | |
| 645 | while (n) |
| 646 | { |
| 647 | struct dcache_block *db = (struct dcache_block *) n->value; |
| 648 | |
| 649 | printf_filtered (_("Line %d: address %s [%d hits]\n"), |
| 650 | i, paddress (target_gdbarch, db->addr), db->refs); |
| 651 | i++; |
| 652 | refcount += db->refs; |
| 653 | |
| 654 | n = splay_tree_successor (last_cache->tree, n->key); |
| 655 | } |
| 656 | |
| 657 | printf_filtered (_("Cache state: %d active lines, %d hits\n"), i, refcount); |
| 658 | } |
| 659 | |
| 660 | static void |
| 661 | set_dcache_size (char *args, int from_tty, |
| 662 | struct cmd_list_element *c) |
| 663 | { |
| 664 | if (dcache_size == 0) |
| 665 | { |
| 666 | dcache_size = DCACHE_DEFAULT_SIZE; |
| 667 | error (_("Dcache size must be greater than 0.")); |
| 668 | } |
| 669 | if (last_cache) |
| 670 | dcache_invalidate (last_cache); |
| 671 | } |
| 672 | |
| 673 | static void |
| 674 | set_dcache_line_size (char *args, int from_tty, |
| 675 | struct cmd_list_element *c) |
| 676 | { |
| 677 | if (dcache_line_size < 2 |
| 678 | || (dcache_line_size & (dcache_line_size - 1)) != 0) |
| 679 | { |
| 680 | unsigned d = dcache_line_size; |
| 681 | dcache_line_size = DCACHE_DEFAULT_LINE_SIZE; |
| 682 | error (_("Invalid dcache line size: %u (must be power of 2)."), d); |
| 683 | } |
| 684 | if (last_cache) |
| 685 | dcache_invalidate (last_cache); |
| 686 | } |
| 687 | |
| 688 | static void |
| 689 | set_dcache_command (char *arg, int from_tty) |
| 690 | { |
| 691 | printf_unfiltered ( |
| 692 | "\"set dcache\" must be followed by the name of a subcommand.\n"); |
| 693 | help_list (dcache_set_list, "set dcache ", -1, gdb_stdout); |
| 694 | } |
| 695 | |
| 696 | static void |
| 697 | show_dcache_command (char *args, int from_tty) |
| 698 | { |
| 699 | cmd_show_list (dcache_show_list, from_tty, ""); |
| 700 | } |
| 701 | |
| 702 | void |
| 703 | _initialize_dcache (void) |
| 704 | { |
| 705 | add_setshow_boolean_cmd ("remotecache", class_support, |
| 706 | &dcache_enabled_p, _("\ |
| 707 | Set cache use for remote targets."), _("\ |
| 708 | Show cache use for remote targets."), _("\ |
| 709 | This used to enable the data cache for remote targets. The cache\n\ |
| 710 | functionality is now controlled by the memory region system and the\n\ |
| 711 | \"stack-cache\" flag; \"remotecache\" now does nothing and\n\ |
| 712 | exists only for compatibility reasons."), |
| 713 | NULL, |
| 714 | show_dcache_enabled_p, |
| 715 | &setlist, &showlist); |
| 716 | |
| 717 | add_info ("dcache", dcache_info, |
| 718 | _("\ |
| 719 | Print information on the dcache performance.\n\ |
| 720 | With no arguments, this command prints the cache configuration and a\n\ |
| 721 | summary of each line in the cache. Use \"info dcache <lineno> to dump\"\n\ |
| 722 | the contents of a given line.")); |
| 723 | |
| 724 | add_prefix_cmd ("dcache", class_obscure, set_dcache_command, _("\ |
| 725 | Use this command to set number of lines in dcache and line-size."), |
| 726 | &dcache_set_list, "set dcache ", /*allow_unknown*/0, &setlist); |
| 727 | add_prefix_cmd ("dcache", class_obscure, show_dcache_command, _("\ |
| 728 | Show dcachesettings."), |
| 729 | &dcache_show_list, "show dcache ", /*allow_unknown*/0, &showlist); |
| 730 | |
| 731 | add_setshow_uinteger_cmd ("line-size", class_obscure, |
| 732 | &dcache_line_size, _("\ |
| 733 | Set dcache line size in bytes (must be power of 2)."), _("\ |
| 734 | Show dcache line size."), |
| 735 | NULL, |
| 736 | set_dcache_line_size, |
| 737 | NULL, |
| 738 | &dcache_set_list, &dcache_show_list); |
| 739 | add_setshow_uinteger_cmd ("size", class_obscure, |
| 740 | &dcache_size, _("\ |
| 741 | Set number of dcache lines."), _("\ |
| 742 | Show number of dcache lines."), |
| 743 | NULL, |
| 744 | set_dcache_size, |
| 745 | NULL, |
| 746 | &dcache_set_list, &dcache_show_list); |
| 747 | } |