granicus.if.org Git - strace/blob - mem.c

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 2000 PocketPenguins Inc.  Linux for Hitachi SuperH
   7  *                    port by Greg Banks <gbanks@pocketpenguins.com>
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include "defs.h"
  34 #include <asm/mman.h>
  35 #include <sys/mman.h>
  36
  37 static unsigned long
  38 get_pagesize()
  39 {
  40         static unsigned long pagesize;
  41
  42         if (!pagesize)
  43                 pagesize = sysconf(_SC_PAGESIZE);
  44         return pagesize;
  45 }
  46
  47 int
  48 sys_brk(struct tcb *tcp)
  49 {
  50         if (entering(tcp)) {
  51                 tprintf("%#lx", tcp->u_arg[0]);
  52         }
  53         return RVAL_HEX;
  54 }
  55
  56 #include "xlat/mmap_prot.h"
  57 #include "xlat/mmap_flags.h"
  58
  59 static int
  60 print_mmap(struct tcb *tcp, long *u_arg, unsigned long long offset)
  61 {
  62         if (entering(tcp)) {
  63 #ifdef USE_LIBUNWIND
  64                 if (stack_trace_enabled) {
  65                         unwind_capture_stacktrace(tcp);
  66                         unwind_cache_invalidate(tcp);
  67                 }
  68 #endif
  69
  70                 /* addr */
  71                 if (!u_arg[0])
  72                         tprints("NULL, ");
  73                 else
  74                         tprintf("%#lx, ", u_arg[0]);
  75                 /* len */
  76                 tprintf("%lu, ", u_arg[1]);
  77                 /* prot */
  78                 printflags(mmap_prot, u_arg[2], "PROT_???");
  79                 tprints(", ");
  80                 /* flags */
  81 #ifdef MAP_TYPE
  82                 printxval(mmap_flags, u_arg[3] & MAP_TYPE, "MAP_???");
  83                 addflags(mmap_flags, u_arg[3] & ~MAP_TYPE);
  84 #else
  85                 printflags(mmap_flags, u_arg[3], "MAP_???");
  86 #endif
  87                 tprints(", ");
  88                 /* fd */
  89                 printfd(tcp, u_arg[4]);
  90                 /* offset */
  91                 tprintf(", %#llx", offset);
  92         }
  93         return RVAL_HEX;
  94 }
  95
  96 /* Syscall name<->function correspondence is messed up on many arches.
  97  * For example:
  98  * i386 has __NR_mmap == 90, and it is "old mmap", and
  99  * also it has __NR_mmap2 == 192, which is a "new mmap with page offsets".
 100  * But x86_64 has just one __NR_mmap == 9, a "new mmap with byte offsets".
 101  * Confused? Me too!
 102  */
 103
 104 /* Params are pointed to by u_arg[0], offset is in bytes */
 105 int
 106 sys_old_mmap(struct tcb *tcp)
 107 {
 108         long u_arg[6];
 109 #if defined(IA64)
 110         /*
 111          * IA64 processes never call this routine, they only use the
 112          * new 'sys_mmap' interface. Only IA32 processes come here.
 113          */
 114         int i;
 115         unsigned narrow_arg[6];
 116         if (umoven(tcp, tcp->u_arg[0], sizeof(narrow_arg), (char *) narrow_arg) == -1)
 117                 return 0;
 118         for (i = 0; i < 6; i++)
 119                 u_arg[i] = (unsigned long) narrow_arg[i];
 120 #elif defined(X86_64)
 121         /* We are here only in personality 1 (i386) */
 122         int i;
 123         unsigned narrow_arg[6];
 124         if (umoven(tcp, tcp->u_arg[0], sizeof(narrow_arg), (char *) narrow_arg) == -1)
 125                 return 0;
 126         for (i = 0; i < 6; ++i)
 127                 u_arg[i] = (unsigned long) narrow_arg[i];
 128 #else
 129         if (umoven(tcp, tcp->u_arg[0], sizeof(u_arg), (char *) u_arg) == -1)
 130                 return 0;
 131 #endif
 132         return print_mmap(tcp, u_arg, (unsigned long) u_arg[5]);
 133 }
 134
 135 #if defined(S390)
 136 /* Params are pointed to by u_arg[0], offset is in pages */
 137 int
 138 sys_old_mmap_pgoff(struct tcb *tcp)
 139 {
 140         long u_arg[5];
 141         int i;
 142         unsigned narrow_arg[6];
 143         unsigned long long offset;
 144         if (umoven(tcp, tcp->u_arg[0], sizeof(narrow_arg), (char *) narrow_arg) == -1)
 145                 return 0;
 146         for (i = 0; i < 5; i++)
 147                 u_arg[i] = (unsigned long) narrow_arg[i];
 148         offset = narrow_arg[5];
 149         offset *= get_pagesize();
 150         return print_mmap(tcp, u_arg, offset);
 151 }
 152 #endif
 153
 154 /* Params are passed directly, offset is in bytes */
 155 int
 156 sys_mmap(struct tcb *tcp)
 157 {
 158         unsigned long long offset = (unsigned long) tcp->u_arg[5];
 159 #if defined(LINUX_MIPSN32) || defined(X32)
 160         /* Try test/x32_mmap.c */
 161         offset = tcp->ext_arg[5];
 162 #endif
 163         /* Example of kernel-side handling of this variety of mmap:
 164          * arch/x86/kernel/sys_x86_64.c::SYSCALL_DEFINE6(mmap, ...) calls
 165          * sys_mmap_pgoff(..., off >> PAGE_SHIFT); i.e. off is in bytes,
 166          * since the above code converts off to pages.
 167          */
 168         return print_mmap(tcp, tcp->u_arg, offset);
 169 }
 170
 171 /* Params are passed directly, offset is in pages */
 172 int
 173 sys_mmap_pgoff(struct tcb *tcp)
 174 {
 175         /* Try test/mmap_offset_decode.c */
 176         unsigned long long offset;
 177         offset = (unsigned long) tcp->u_arg[5];
 178         offset *= get_pagesize();
 179         return print_mmap(tcp, tcp->u_arg, offset);
 180 }
 181
 182 /* Params are passed directly, offset is in 4k units */
 183 int
 184 sys_mmap_4koff(struct tcb *tcp)
 185 {
 186         unsigned long long offset;
 187         offset = (unsigned long) tcp->u_arg[5];
 188         offset <<= 12;
 189         return print_mmap(tcp, tcp->u_arg, offset);
 190 }
 191
 192 int
 193 sys_munmap(struct tcb *tcp)
 194 {
 195         if (entering(tcp)) {
 196                 tprintf("%#lx, %lu",
 197                         tcp->u_arg[0], tcp->u_arg[1]);
 198 #ifdef USE_LIBUNWIND
 199                 if (stack_trace_enabled)
 200                         unwind_capture_stacktrace(tcp);
 201 #endif
 202         }
 203 #ifdef USE_LIBUNWIND
 204         else {
 205                 if (stack_trace_enabled)
 206                         unwind_cache_invalidate(tcp);
 207         }
 208 #endif
 209         return 0;
 210 }
 211
 212 int
 213 sys_mprotect(struct tcb *tcp)
 214 {
 215         if (entering(tcp)) {
 216                 tprintf("%#lx, %lu, ",
 217                         tcp->u_arg[0], tcp->u_arg[1]);
 218                 printflags(mmap_prot, tcp->u_arg[2], "PROT_???");
 219 #ifdef USE_LIBUNWIND
 220                 if (stack_trace_enabled)
 221                         unwind_capture_stacktrace(tcp);
 222 #endif
 223         }
 224 #ifdef USE_LIBUNWIND
 225         else {
 226                 if (stack_trace_enabled)
 227                         unwind_cache_invalidate(tcp);
 228         }
 229 #endif
 230         return 0;
 231 }
 232
 233 #include "xlat/mremap_flags.h"
 234
 235 int
 236 sys_mremap(struct tcb *tcp)
 237 {
 238         if (entering(tcp)) {
 239                 tprintf("%#lx, %lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1],
 240                         tcp->u_arg[2]);
 241                 printflags(mremap_flags, tcp->u_arg[3], "MREMAP_???");
 242 #ifdef MREMAP_FIXED
 243                 if ((tcp->u_arg[3] & (MREMAP_MAYMOVE | MREMAP_FIXED)) ==
 244                     (MREMAP_MAYMOVE | MREMAP_FIXED))
 245                         tprintf(", %#lx", tcp->u_arg[4]);
 246 #endif
 247         }
 248         return RVAL_HEX;
 249 }
 250
 251 #include "xlat/madvise_cmds.h"
 252
 253 int
 254 sys_madvise(struct tcb *tcp)
 255 {
 256         if (entering(tcp)) {
 257                 tprintf("%#lx, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
 258                 printxval(madvise_cmds, tcp->u_arg[2], "MADV_???");
 259         }
 260         return 0;
 261 }
 262
 263 #include "xlat/mlockall_flags.h"
 264
 265 int
 266 sys_mlockall(struct tcb *tcp)
 267 {
 268         if (entering(tcp)) {
 269                 printflags(mlockall_flags, tcp->u_arg[0], "MCL_???");
 270         }
 271         return 0;
 272 }
 273
 274 #ifdef MS_ASYNC
 275
 276 #include "xlat/mctl_sync.h"
 277
 278 int
 279 sys_msync(struct tcb *tcp)
 280 {
 281         if (entering(tcp)) {
 282                 /* addr */
 283                 tprintf("%#lx", tcp->u_arg[0]);
 284                 /* len */
 285                 tprintf(", %lu, ", tcp->u_arg[1]);
 286                 /* flags */
 287                 printflags(mctl_sync, tcp->u_arg[2], "MS_???");
 288         }
 289         return 0;
 290 }
 291
 292 #endif /* MS_ASYNC */
 293
 294 #ifdef MC_SYNC
 295
 296 #include "xlat/mctl_funcs.h"
 297 #include "xlat/mctl_lockas.h"
 298
 299 int
 300 sys_mctl(struct tcb *tcp)
 301 {
 302         int arg, function;
 303
 304         if (entering(tcp)) {
 305                 /* addr */
 306                 tprintf("%#lx", tcp->u_arg[0]);
 307                 /* len */
 308                 tprintf(", %lu, ", tcp->u_arg[1]);
 309                 /* function */
 310                 function = tcp->u_arg[2];
 311                 printflags(mctl_funcs, function, "MC_???");
 312                 /* arg */
 313                 arg = tcp->u_arg[3];
 314                 tprints(", ");
 315                 switch (function) {
 316                 case MC_SYNC:
 317                         printflags(mctl_sync, arg, "MS_???");
 318                         break;
 319                 case MC_LOCKAS:
 320                         printflags(mctl_lockas, arg, "MCL_???");
 321                         break;
 322                 default:
 323                         tprintf("%#x", arg);
 324                         break;
 325                 }
 326         }
 327         return 0;
 328 }
 329
 330 #endif /* MC_SYNC */
 331
 332 int
 333 sys_mincore(struct tcb *tcp)
 334 {
 335         if (entering(tcp)) {
 336                 tprintf("%#lx, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
 337         } else {
 338                 unsigned long i, len;
 339                 char *vec = NULL;
 340
 341                 len = tcp->u_arg[1];
 342                 if (syserror(tcp) || tcp->u_arg[2] == 0 ||
 343                         (vec = malloc(len)) == NULL ||
 344                         umoven(tcp, tcp->u_arg[2], len, vec) < 0)
 345                         tprintf("%#lx", tcp->u_arg[2]);
 346                 else {
 347                         tprints("[");
 348                         for (i = 0; i < len; i++) {
 349                                 if (abbrev(tcp) && i >= max_strlen) {
 350                                         tprints("...");
 351                                         break;
 352                                 }
 353                                 tprints((vec[i] & 1) ? "1" : "0");
 354                         }
 355                         tprints("]");
 356                 }
 357                 free(vec);
 358         }
 359         return 0;
 360 }
 361
 362 #if defined(ALPHA) || defined(IA64) || defined(SPARC) || defined(SPARC64)
 363 int
 364 sys_getpagesize(struct tcb *tcp)
 365 {
 366         if (exiting(tcp))
 367                 return RVAL_HEX;
 368         return 0;
 369 }
 370 #endif
 371
 372 int
 373 sys_remap_file_pages(struct tcb *tcp)
 374 {
 375         if (entering(tcp)) {
 376                 tprintf("%#lx, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
 377                 printflags(mmap_prot, tcp->u_arg[2], "PROT_???");
 378                 tprintf(", %lu, ", tcp->u_arg[3]);
 379 #ifdef MAP_TYPE
 380                 printxval(mmap_flags, tcp->u_arg[4] & MAP_TYPE, "MAP_???");
 381                 addflags(mmap_flags, tcp->u_arg[4] & ~MAP_TYPE);
 382 #else
 383                 printflags(mmap_flags, tcp->u_arg[4], "MAP_???");
 384 #endif
 385         }
 386         return 0;
 387 }
 388
 389 #define MPOL_DEFAULT    0
 390 #define MPOL_PREFERRED  1
 391 #define MPOL_BIND       2
 392 #define MPOL_INTERLEAVE 3
 393
 394 #define MPOL_F_NODE     (1<<0)
 395 #define MPOL_F_ADDR     (1<<1)
 396
 397 #define MPOL_MF_STRICT  (1<<0)
 398 #define MPOL_MF_MOVE    (1<<1)
 399 #define MPOL_MF_MOVE_ALL (1<<2)
 400
 401 #include "xlat/policies.h"
 402 #include "xlat/mbindflags.h"
 403 #include "xlat/mempolicyflags.h"
 404 #include "xlat/move_pages_flags.h"
 405
 406 static void
 407 get_nodes(struct tcb *tcp, unsigned long ptr, unsigned long maxnodes, int err)
 408 {
 409         unsigned long nlongs, size, end;
 410
 411         nlongs = (maxnodes + 8 * sizeof(long) - 1) / (8 * sizeof(long));
 412         size = nlongs * sizeof(long);
 413         end = ptr + size;
 414         if (nlongs == 0 || ((err || verbose(tcp)) && (size * 8 == maxnodes)
 415                             && (end > ptr))) {
 416                 unsigned long n, cur, abbrev_end;
 417                 int failed = 0;
 418
 419                 if (abbrev(tcp)) {
 420                         abbrev_end = ptr + max_strlen * sizeof(long);
 421                         if (abbrev_end < ptr)
 422                                 abbrev_end = end;
 423                 } else {
 424                         abbrev_end = end;
 425                 }
 426                 tprints(", {");
 427                 for (cur = ptr; cur < end; cur += sizeof(long)) {
 428                         if (cur > ptr)
 429                                 tprints(", ");
 430                         if (cur >= abbrev_end) {
 431                                 tprints("...");
 432                                 break;
 433                         }
 434                         if (umoven(tcp, cur, sizeof(n), (char *) &n) < 0) {
 435                                 tprints("?");
 436                                 failed = 1;
 437                                 break;
 438                         }
 439                         tprintf("%#0*lx", (int) sizeof(long) * 2 + 2, n);
 440                 }
 441                 tprints("}");
 442                 if (failed)
 443                         tprintf(" %#lx", ptr);
 444         } else
 445                 tprintf(", %#lx", ptr);
 446         tprintf(", %lu", maxnodes);
 447 }
 448
 449 int
 450 sys_mbind(struct tcb *tcp)
 451 {
 452         if (entering(tcp)) {
 453                 tprintf("%#lx, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
 454                 printxval(policies, tcp->u_arg[2], "MPOL_???");
 455                 get_nodes(tcp, tcp->u_arg[3], tcp->u_arg[4], 0);
 456                 tprints(", ");
 457                 printflags(mbindflags, tcp->u_arg[5], "MPOL_???");
 458         }
 459         return 0;
 460 }
 461
 462 int
 463 sys_set_mempolicy(struct tcb *tcp)
 464 {
 465         if (entering(tcp)) {
 466                 printxval(policies, tcp->u_arg[0], "MPOL_???");
 467                 get_nodes(tcp, tcp->u_arg[1], tcp->u_arg[2], 0);
 468         }
 469         return 0;
 470 }
 471
 472 int
 473 sys_get_mempolicy(struct tcb *tcp)
 474 {
 475         if (exiting(tcp)) {
 476                 int pol;
 477                 if (tcp->u_arg[0] == 0)
 478                         tprints("NULL");
 479                 else if (syserror(tcp) || umove(tcp, tcp->u_arg[0], &pol) < 0)
 480                         tprintf("%#lx", tcp->u_arg[0]);
 481                 else
 482                         printxval(policies, pol, "MPOL_???");
 483                 get_nodes(tcp, tcp->u_arg[1], tcp->u_arg[2], syserror(tcp));
 484                 tprintf(", %#lx, ", tcp->u_arg[3]);
 485                 printflags(mempolicyflags, tcp->u_arg[4], "MPOL_???");
 486         }
 487         return 0;
 488 }
 489
 490 int
 491 sys_migrate_pages(struct tcb *tcp)
 492 {
 493         if (entering(tcp)) {
 494                 tprintf("%ld, ", (long) (pid_t) tcp->u_arg[0]);
 495                 get_nodes(tcp, tcp->u_arg[2], tcp->u_arg[1], 0);
 496                 tprints(", ");
 497                 get_nodes(tcp, tcp->u_arg[3], tcp->u_arg[1], 0);
 498         }
 499         return 0;
 500 }
 501
 502 int
 503 sys_move_pages(struct tcb *tcp)
 504 {
 505         if (entering(tcp)) {
 506                 unsigned long npages = tcp->u_arg[1];
 507                 tprintf("%ld, %lu, ", tcp->u_arg[0], npages);
 508                 if (tcp->u_arg[2] == 0)
 509                         tprints("NULL, ");
 510                 else {
 511                         int i;
 512                         long puser = tcp->u_arg[2];
 513                         tprints("{");
 514                         for (i = 0; i < npages; ++i) {
 515                                 void *p;
 516                                 if (i > 0)
 517                                         tprints(", ");
 518                                 if (umove(tcp, puser, &p) < 0) {
 519                                         tprints("???");
 520                                         break;
 521                                 }
 522                                 tprintf("%p", p);
 523                                 puser += sizeof(void *);
 524                         }
 525                         tprints("}, ");
 526                 }
 527                 if (tcp->u_arg[3] == 0)
 528                         tprints("NULL, ");
 529                 else {
 530                         int i;
 531                         long nodeuser = tcp->u_arg[3];
 532                         tprints("{");
 533                         for (i = 0; i < npages; ++i) {
 534                                 int node;
 535                                 if (i > 0)
 536                                         tprints(", ");
 537                                 if (umove(tcp, nodeuser, &node) < 0) {
 538                                         tprints("???");
 539                                         break;
 540                                 }
 541                                 tprintf("%#x", node);
 542                                 nodeuser += sizeof(int);
 543                         }
 544                         tprints("}, ");
 545                 }
 546         }
 547         if (exiting(tcp)) {
 548                 unsigned long npages = tcp->u_arg[1];
 549                 if (tcp->u_arg[4] == 0)
 550                         tprints("NULL, ");
 551                 else {
 552                         int i;
 553                         long statususer = tcp->u_arg[4];
 554                         tprints("{");
 555                         for (i = 0; i < npages; ++i) {
 556                                 int status;
 557                                 if (i > 0)
 558                                         tprints(", ");
 559                                 if (umove(tcp, statususer, &status) < 0) {
 560                                         tprints("???");
 561                                         break;
 562                                 }
 563                                 tprintf("%#x", status);
 564                                 statususer += sizeof(int);
 565                         }
 566                         tprints("}, ");
 567                 }
 568                 printflags(move_pages_flags, tcp->u_arg[5], "MPOL_???");
 569         }
 570         return 0;
 571 }
 572
 573 #if defined(POWERPC)
 574 int
 575 sys_subpage_prot(struct tcb *tcp)
 576 {
 577         if (entering(tcp)) {
 578                 unsigned long cur, end, abbrev_end, entries;
 579                 unsigned int entry;
 580
 581                 tprintf("%#lx, %#lx, ", tcp->u_arg[0], tcp->u_arg[1]);
 582                 entries = tcp->u_arg[1] >> 16;
 583                 if (!entries || !tcp->u_arg[2]) {
 584                         tprints("{}");
 585                         return 0;
 586                 }
 587                 cur = tcp->u_arg[2];
 588                 end = cur + (sizeof(int) * entries);
 589                 if (!verbose(tcp) || end < tcp->u_arg[2]) {
 590                         tprintf("%#lx", tcp->u_arg[2]);
 591                         return 0;
 592                 }
 593                 if (abbrev(tcp)) {
 594                         abbrev_end = cur + (sizeof(int) * max_strlen);
 595                         if (abbrev_end > end)
 596                                 abbrev_end = end;
 597                 }
 598                 else
 599                         abbrev_end = end;
 600                 tprints("{");
 601                 for (; cur < end; cur += sizeof(int)) {
 602                         if (cur > tcp->u_arg[2])
 603                                 tprints(", ");
 604                         if (cur >= abbrev_end) {
 605                                 tprints("...");
 606                                 break;
 607                         }
 608                         if (umove(tcp, cur, &entry) < 0) {
 609                                 tprintf("??? [%#lx]", cur);
 610                                 break;
 611                         }
 612                         else
 613                                 tprintf("%#08x", entry);
 614                 }
 615                 tprints("}");
 616         }
 617
 618         return 0;
 619 }
 620 #endif