1 /* 2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2019 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 // According to the AIX OS doc #pragma alloca must be used 27 // with C++ compiler before referencing the function alloca() 28 #pragma alloca 29 30 // no precompiled headers 31 #include "jvm.h" 32 #include "classfile/classLoader.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmSymbols.hpp" 35 #include "code/icBuffer.hpp" 36 #include "code/vtableStubs.hpp" 37 #include "compiler/compileBroker.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "logging/log.hpp" 40 #include "logging/logStream.hpp" 41 #include "libo4.hpp" 42 #include "libperfstat_aix.hpp" 43 #include "libodm_aix.hpp" 44 #include "loadlib_aix.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/filemap.hpp" 47 #include "misc_aix.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "os_aix.inline.hpp" 50 #include "os_share_aix.hpp" 51 #include "porting_aix.hpp" 52 #include "prims/jniFastGetField.hpp" 53 #include "prims/jvm_misc.hpp" 54 #include "runtime/arguments.hpp" 55 #include "runtime/atomic.hpp" 56 #include "runtime/extendedPC.hpp" 57 #include "runtime/globals.hpp" 58 #include "runtime/interfaceSupport.inline.hpp" 59 #include "runtime/java.hpp" 60 #include "runtime/javaCalls.hpp" 61 #include "runtime/mutexLocker.hpp" 62 #include "runtime/objectMonitor.hpp" 63 #include "runtime/orderAccess.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/osThread.hpp" 66 #include "runtime/perfMemory.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/statSampler.hpp" 69 #include "runtime/stubRoutines.hpp" 70 #include "runtime/thread.inline.hpp" 71 #include "runtime/threadCritical.hpp" 72 #include "runtime/timer.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "services/attachListener.hpp" 75 #include "services/runtimeService.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/decoder.hpp" 78 #include "utilities/defaultStream.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/growableArray.hpp" 81 #include "utilities/vmError.hpp" 82 83 // put OS-includes here (sorted alphabetically) 84 #include <errno.h> 85 #include <fcntl.h> 86 #include <inttypes.h> 87 #include <poll.h> 88 #include <procinfo.h> 89 #include <pthread.h> 90 #include <pwd.h> 91 #include <semaphore.h> 92 #include <signal.h> 93 #include <stdint.h> 94 #include <stdio.h> 95 #include <string.h> 96 #include <unistd.h> 97 #include <sys/ioctl.h> 98 #include <sys/ipc.h> 99 #include <sys/mman.h> 100 #include <sys/resource.h> 101 #include <sys/select.h> 102 #include <sys/shm.h> 103 #include <sys/socket.h> 104 #include <sys/stat.h> 105 #include <sys/sysinfo.h> 106 #include <sys/systemcfg.h> 107 #include <sys/time.h> 108 #include <sys/times.h> 109 #include <sys/types.h> 110 #include <sys/utsname.h> 111 #include <sys/vminfo.h> 112 #include <sys/wait.h> 113 114 // Missing prototypes for various system APIs. 115 extern "C" 116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); 117 118 #if !defined(_AIXVERSION_610) 119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int); 120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int); 121 extern "C" int getargs(procsinfo*, int, char*, int); 122 #endif 123 124 #define MAX_PATH (2 * K) 125 126 // for timer info max values which include all bits 127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 128 // for multipage initialization error analysis (in 'g_multipage_error') 129 #define ERROR_MP_OS_TOO_OLD 100 130 #define ERROR_MP_EXTSHM_ACTIVE 101 131 #define ERROR_MP_VMGETINFO_FAILED 102 132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 133 134 // excerpts from systemcfg.h that might be missing on older os levels 135 #ifndef PV_7 136 #define PV_7 0x200000 /* Power PC 7 */ 137 #endif 138 #ifndef PV_7_Compat 139 #define PV_7_Compat 0x208000 /* Power PC 7 */ 140 #endif 141 #ifndef PV_8 142 #define PV_8 0x300000 /* Power PC 8 */ 143 #endif 144 #ifndef PV_8_Compat 145 #define PV_8_Compat 0x308000 /* Power PC 8 */ 146 #endif 147 #ifndef PV_9 148 #define PV_9 0x400000 /* Power PC 9 */ 149 #endif 150 #ifndef PV_9_Compat 151 #define PV_9_Compat 0x408000 /* Power PC 9 */ 152 #endif 153 154 155 static address resolve_function_descriptor_to_code_pointer(address p); 156 157 static void vmembk_print_on(outputStream* os); 158 159 //////////////////////////////////////////////////////////////////////////////// 160 // global variables (for a description see os_aix.hpp) 161 162 julong os::Aix::_physical_memory = 0; 163 164 pthread_t os::Aix::_main_thread = ((pthread_t)0); 165 int os::Aix::_page_size = -1; 166 167 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase 168 int os::Aix::_on_pase = -1; 169 170 // 0 = uninitialized, otherwise 32 bit number: 171 // 0xVVRRTTSS 172 // VV - major version 173 // RR - minor version 174 // TT - tech level, if known, 0 otherwise 175 // SS - service pack, if known, 0 otherwise 176 uint32_t os::Aix::_os_version = 0; 177 178 // -1 = uninitialized, 0 - no, 1 - yes 179 int os::Aix::_xpg_sus_mode = -1; 180 181 // -1 = uninitialized, 0 - no, 1 - yes 182 int os::Aix::_extshm = -1; 183 184 //////////////////////////////////////////////////////////////////////////////// 185 // local variables 186 187 static volatile jlong max_real_time = 0; 188 static jlong initial_time_count = 0; 189 static int clock_tics_per_sec = 100; 190 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) 191 static bool check_signals = true; 192 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) 193 static sigset_t SR_sigset; 194 195 // Process break recorded at startup. 196 static address g_brk_at_startup = NULL; 197 198 // This describes the state of multipage support of the underlying 199 // OS. Note that this is of no interest to the outsize world and 200 // therefore should not be defined in AIX class. 201 // 202 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The 203 // latter two (16M "large" resp. 16G "huge" pages) require special 204 // setup and are normally not available. 205 // 206 // AIX supports multiple page sizes per process, for: 207 // - Stack (of the primordial thread, so not relevant for us) 208 // - Data - data, bss, heap, for us also pthread stacks 209 // - Text - text code 210 // - shared memory 211 // 212 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) 213 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...). 214 // 215 // For shared memory, page size can be set dynamically via 216 // shmctl(). Different shared memory regions can have different page 217 // sizes. 218 // 219 // More information can be found at AIBM info center: 220 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm 221 // 222 static struct { 223 size_t pagesize; // sysconf _SC_PAGESIZE (4K) 224 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE) 225 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE) 226 size_t pthr_stack_pagesize; // stack page size of pthread threads 227 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE) 228 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm. 229 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm. 230 int error; // Error describing if something went wrong at multipage init. 231 } g_multipage_support = { 232 (size_t) -1, 233 (size_t) -1, 234 (size_t) -1, 235 (size_t) -1, 236 (size_t) -1, 237 false, false, 238 0 239 }; 240 241 // We must not accidentally allocate memory close to the BRK - even if 242 // that would work - because then we prevent the BRK segment from 243 // growing which may result in a malloc OOM even though there is 244 // enough memory. The problem only arises if we shmat() or mmap() at 245 // a specific wish address, e.g. to place the heap in a 246 // compressed-oops-friendly way. 247 static bool is_close_to_brk(address a) { 248 assert0(g_brk_at_startup != NULL); 249 if (a >= g_brk_at_startup && 250 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) { 251 return true; 252 } 253 return false; 254 } 255 256 julong os::available_memory() { 257 return Aix::available_memory(); 258 } 259 260 julong os::Aix::available_memory() { 261 // Avoid expensive API call here, as returned value will always be null. 262 if (os::Aix::on_pase()) { 263 return 0x0LL; 264 } 265 os::Aix::meminfo_t mi; 266 if (os::Aix::get_meminfo(&mi)) { 267 return mi.real_free; 268 } else { 269 return ULONG_MAX; 270 } 271 } 272 273 julong os::physical_memory() { 274 return Aix::physical_memory(); 275 } 276 277 // Return true if user is running as root. 278 279 bool os::have_special_privileges() { 280 static bool init = false; 281 static bool privileges = false; 282 if (!init) { 283 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 284 init = true; 285 } 286 return privileges; 287 } 288 289 // Helper function, emulates disclaim64 using multiple 32bit disclaims 290 // because we cannot use disclaim64() on AS/400 and old AIX releases. 291 static bool my_disclaim64(char* addr, size_t size) { 292 293 if (size == 0) { 294 return true; 295 } 296 297 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) 298 const unsigned int maxDisclaimSize = 0x40000000; 299 300 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); 301 const unsigned int lastDisclaimSize = (size % maxDisclaimSize); 302 303 char* p = addr; 304 305 for (int i = 0; i < numFullDisclaimsNeeded; i ++) { 306 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 307 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); 308 return false; 309 } 310 p += maxDisclaimSize; 311 } 312 313 if (lastDisclaimSize > 0) { 314 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 315 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); 316 return false; 317 } 318 } 319 320 return true; 321 } 322 323 // Cpu architecture string 324 #if defined(PPC32) 325 static char cpu_arch[] = "ppc"; 326 #elif defined(PPC64) 327 static char cpu_arch[] = "ppc64"; 328 #else 329 #error Add appropriate cpu_arch setting 330 #endif 331 332 // Wrap the function "vmgetinfo" which is not available on older OS releases. 333 static int checked_vmgetinfo(void *out, int command, int arg) { 334 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 335 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1"); 336 } 337 return ::vmgetinfo(out, command, arg); 338 } 339 340 // Given an address, returns the size of the page backing that address. 341 size_t os::Aix::query_pagesize(void* addr) { 342 343 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 344 // AS/400 older than V6R1: no vmgetinfo here, default to 4K 345 return 4*K; 346 } 347 348 vm_page_info pi; 349 pi.addr = (uint64_t)addr; 350 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { 351 return pi.pagesize; 352 } else { 353 assert(false, "vmgetinfo failed to retrieve page size"); 354 return 4*K; 355 } 356 } 357 358 void os::Aix::initialize_system_info() { 359 360 // Get the number of online(logical) cpus instead of configured. 361 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); 362 assert(_processor_count > 0, "_processor_count must be > 0"); 363 364 // Retrieve total physical storage. 365 os::Aix::meminfo_t mi; 366 if (!os::Aix::get_meminfo(&mi)) { 367 assert(false, "os::Aix::get_meminfo failed."); 368 } 369 _physical_memory = (julong) mi.real_total; 370 } 371 372 // Helper function for tracing page sizes. 373 static const char* describe_pagesize(size_t pagesize) { 374 switch (pagesize) { 375 case 4*K : return "4K"; 376 case 64*K: return "64K"; 377 case 16*M: return "16M"; 378 case 16*G: return "16G"; 379 default: 380 assert(false, "surprise"); 381 return "??"; 382 } 383 } 384 385 // Probe OS for multipage support. 386 // Will fill the global g_multipage_support structure. 387 // Must be called before calling os::large_page_init(). 388 static void query_multipage_support() { 389 390 guarantee(g_multipage_support.pagesize == -1, 391 "do not call twice"); 392 393 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE); 394 395 // This really would surprise me. 396 assert(g_multipage_support.pagesize == 4*K, "surprise!"); 397 398 // Query default data page size (default page size for C-Heap, pthread stacks and .bss). 399 // Default data page size is defined either by linker options (-bdatapsize) 400 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, 401 // default should be 4K. 402 { 403 void* p = ::malloc(16*M); 404 g_multipage_support.datapsize = os::Aix::query_pagesize(p); 405 ::free(p); 406 } 407 408 // Query default shm page size (LDR_CNTRL SHMPSIZE). 409 // Note that this is pure curiosity. We do not rely on default page size but set 410 // our own page size after allocated. 411 { 412 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); 413 guarantee(shmid != -1, "shmget failed"); 414 void* p = ::shmat(shmid, NULL, 0); 415 ::shmctl(shmid, IPC_RMID, NULL); 416 guarantee(p != (void*) -1, "shmat failed"); 417 g_multipage_support.shmpsize = os::Aix::query_pagesize(p); 418 ::shmdt(p); 419 } 420 421 // Before querying the stack page size, make sure we are not running as primordial 422 // thread (because primordial thread's stack may have different page size than 423 // pthread thread stacks). Running a VM on the primordial thread won't work for a 424 // number of reasons so we may just as well guarantee it here. 425 guarantee0(!os::is_primordial_thread()); 426 427 // Query pthread stack page size. Should be the same as data page size because 428 // pthread stacks are allocated from C-Heap. 429 { 430 int dummy = 0; 431 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy); 432 } 433 434 // Query default text page size (LDR_CNTRL TEXTPSIZE). 435 { 436 address any_function = 437 resolve_function_descriptor_to_code_pointer((address)describe_pagesize); 438 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function); 439 } 440 441 // Now probe for support of 64K pages and 16M pages. 442 443 // Before OS/400 V6R1, there is no support for pages other than 4K. 444 if (os::Aix::on_pase_V5R4_or_older()) { 445 trcVerbose("OS/400 < V6R1 - no large page support."); 446 g_multipage_support.error = ERROR_MP_OS_TOO_OLD; 447 goto query_multipage_support_end; 448 } 449 450 // Now check which page sizes the OS claims it supports, and of those, which actually can be used. 451 { 452 const int MAX_PAGE_SIZES = 4; 453 psize_t sizes[MAX_PAGE_SIZES]; 454 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); 455 if (num_psizes == -1) { 456 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno); 457 trcVerbose("disabling multipage support."); 458 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED; 459 goto query_multipage_support_end; 460 } 461 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); 462 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); 463 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); 464 for (int i = 0; i < num_psizes; i ++) { 465 trcVerbose(" %s ", describe_pagesize(sizes[i])); 466 } 467 468 // Can we use 64K, 16M pages? 469 for (int i = 0; i < num_psizes; i ++) { 470 const size_t pagesize = sizes[i]; 471 if (pagesize != 64*K && pagesize != 16*M) { 472 continue; 473 } 474 bool can_use = false; 475 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize)); 476 const int shmid = ::shmget(IPC_PRIVATE, pagesize, 477 IPC_CREAT | S_IRUSR | S_IWUSR); 478 guarantee0(shmid != -1); // Should always work. 479 // Try to set pagesize. 480 struct shmid_ds shm_buf = { 0 }; 481 shm_buf.shm_pagesize = pagesize; 482 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) { 483 const int en = errno; 484 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 485 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno); 486 } else { 487 // Attach and double check pageisze. 488 void* p = ::shmat(shmid, NULL, 0); 489 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 490 guarantee0(p != (void*) -1); // Should always work. 491 const size_t real_pagesize = os::Aix::query_pagesize(p); 492 if (real_pagesize != pagesize) { 493 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize); 494 } else { 495 can_use = true; 496 } 497 ::shmdt(p); 498 } 499 trcVerbose("Can use: %s", (can_use ? "yes" : "no")); 500 if (pagesize == 64*K) { 501 g_multipage_support.can_use_64K_pages = can_use; 502 } else if (pagesize == 16*M) { 503 g_multipage_support.can_use_16M_pages = can_use; 504 } 505 } 506 507 } // end: check which pages can be used for shared memory 508 509 query_multipage_support_end: 510 511 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s", 512 describe_pagesize(g_multipage_support.pagesize)); 513 trcVerbose("Data page size (C-Heap, bss, etc): %s", 514 describe_pagesize(g_multipage_support.datapsize)); 515 trcVerbose("Text page size: %s", 516 describe_pagesize(g_multipage_support.textpsize)); 517 trcVerbose("Thread stack page size (pthread): %s", 518 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 519 trcVerbose("Default shared memory page size: %s", 520 describe_pagesize(g_multipage_support.shmpsize)); 521 trcVerbose("Can use 64K pages dynamically with shared memory: %s", 522 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 523 trcVerbose("Can use 16M pages dynamically with shared memory: %s", 524 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 525 trcVerbose("Multipage error details: %d", 526 g_multipage_support.error); 527 528 // sanity checks 529 assert0(g_multipage_support.pagesize == 4*K); 530 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K); 531 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K); 532 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize); 533 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K); 534 535 } 536 537 void os::init_system_properties_values() { 538 539 #ifndef OVERRIDE_LIBPATH 540 #define DEFAULT_LIBPATH "/lib:/usr/lib" 541 #else 542 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH 543 #endif 544 #define EXTENSIONS_DIR "/lib/ext" 545 546 // Buffer that fits several sprintfs. 547 // Note that the space for the trailing null is provided 548 // by the nulls included by the sizeof operator. 549 const size_t bufsize = 550 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 551 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir 552 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 553 554 // sysclasspath, java_home, dll_dir 555 { 556 char *pslash; 557 os::jvm_path(buf, bufsize); 558 559 // Found the full path to libjvm.so. 560 // Now cut the path to <java_home>/jre if we can. 561 pslash = strrchr(buf, '/'); 562 if (pslash != NULL) { 563 *pslash = '\0'; // Get rid of /libjvm.so. 564 } 565 pslash = strrchr(buf, '/'); 566 if (pslash != NULL) { 567 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 568 } 569 Arguments::set_dll_dir(buf); 570 571 if (pslash != NULL) { 572 pslash = strrchr(buf, '/'); 573 if (pslash != NULL) { 574 *pslash = '\0'; // Get rid of /lib. 575 } 576 } 577 Arguments::set_java_home(buf); 578 if (!set_boot_path('/', ':')) { 579 vm_exit_during_initialization("Failed setting boot class path.", NULL); 580 } 581 } 582 583 // Where to look for native libraries. 584 585 // On Aix we get the user setting of LIBPATH. 586 // Eventually, all the library path setting will be done here. 587 // Get the user setting of LIBPATH. 588 const char *v = ::getenv("LIBPATH"); 589 const char *v_colon = ":"; 590 if (v == NULL) { v = ""; v_colon = ""; } 591 592 // Concatenate user and invariant part of ld_library_path. 593 // That's +1 for the colon and +1 for the trailing '\0'. 594 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal); 595 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon); 596 Arguments::set_library_path(ld_library_path); 597 FREE_C_HEAP_ARRAY(char, ld_library_path); 598 599 // Extensions directories. 600 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); 601 Arguments::set_ext_dirs(buf); 602 603 FREE_C_HEAP_ARRAY(char, buf); 604 605 #undef DEFAULT_LIBPATH 606 #undef EXTENSIONS_DIR 607 } 608 609 //////////////////////////////////////////////////////////////////////////////// 610 // breakpoint support 611 612 void os::breakpoint() { 613 BREAKPOINT; 614 } 615 616 extern "C" void breakpoint() { 617 // use debugger to set breakpoint here 618 } 619 620 //////////////////////////////////////////////////////////////////////////////// 621 // signal support 622 623 debug_only(static bool signal_sets_initialized = false); 624 static sigset_t unblocked_sigs, vm_sigs; 625 626 void os::Aix::signal_sets_init() { 627 // Should also have an assertion stating we are still single-threaded. 628 assert(!signal_sets_initialized, "Already initialized"); 629 // Fill in signals that are necessarily unblocked for all threads in 630 // the VM. Currently, we unblock the following signals: 631 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 632 // by -Xrs (=ReduceSignalUsage)); 633 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 634 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 635 // the dispositions or masks wrt these signals. 636 // Programs embedding the VM that want to use the above signals for their 637 // own purposes must, at this time, use the "-Xrs" option to prevent 638 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 639 // (See bug 4345157, and other related bugs). 640 // In reality, though, unblocking these signals is really a nop, since 641 // these signals are not blocked by default. 642 sigemptyset(&unblocked_sigs); 643 sigaddset(&unblocked_sigs, SIGILL); 644 sigaddset(&unblocked_sigs, SIGSEGV); 645 sigaddset(&unblocked_sigs, SIGBUS); 646 sigaddset(&unblocked_sigs, SIGFPE); 647 sigaddset(&unblocked_sigs, SIGTRAP); 648 sigaddset(&unblocked_sigs, SR_signum); 649 650 if (!ReduceSignalUsage) { 651 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 652 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 653 } 654 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 655 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 656 } 657 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 658 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 659 } 660 } 661 // Fill in signals that are blocked by all but the VM thread. 662 sigemptyset(&vm_sigs); 663 if (!ReduceSignalUsage) 664 sigaddset(&vm_sigs, BREAK_SIGNAL); 665 debug_only(signal_sets_initialized = true); 666 } 667 668 // These are signals that are unblocked while a thread is running Java. 669 // (For some reason, they get blocked by default.) 670 sigset_t* os::Aix::unblocked_signals() { 671 assert(signal_sets_initialized, "Not initialized"); 672 return &unblocked_sigs; 673 } 674 675 // These are the signals that are blocked while a (non-VM) thread is 676 // running Java. Only the VM thread handles these signals. 677 sigset_t* os::Aix::vm_signals() { 678 assert(signal_sets_initialized, "Not initialized"); 679 return &vm_sigs; 680 } 681 682 void os::Aix::hotspot_sigmask(Thread* thread) { 683 684 //Save caller's signal mask before setting VM signal mask 685 sigset_t caller_sigmask; 686 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 687 688 OSThread* osthread = thread->osthread(); 689 osthread->set_caller_sigmask(caller_sigmask); 690 691 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); 692 693 if (!ReduceSignalUsage) { 694 if (thread->is_VM_thread()) { 695 // Only the VM thread handles BREAK_SIGNAL ... 696 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 697 } else { 698 // ... all other threads block BREAK_SIGNAL 699 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 700 } 701 } 702 } 703 704 // retrieve memory information. 705 // Returns false if something went wrong; 706 // content of pmi undefined in this case. 707 bool os::Aix::get_meminfo(meminfo_t* pmi) { 708 709 assert(pmi, "get_meminfo: invalid parameter"); 710 711 memset(pmi, 0, sizeof(meminfo_t)); 712 713 if (os::Aix::on_pase()) { 714 // On PASE, use the libo4 porting library. 715 716 unsigned long long virt_total = 0; 717 unsigned long long real_total = 0; 718 unsigned long long real_free = 0; 719 unsigned long long pgsp_total = 0; 720 unsigned long long pgsp_free = 0; 721 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) { 722 pmi->virt_total = virt_total; 723 pmi->real_total = real_total; 724 pmi->real_free = real_free; 725 pmi->pgsp_total = pgsp_total; 726 pmi->pgsp_free = pgsp_free; 727 return true; 728 } 729 return false; 730 731 } else { 732 733 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics 734 // See: 735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 736 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm 737 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 738 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 739 740 perfstat_memory_total_t psmt; 741 memset (&psmt, '\0', sizeof(psmt)); 742 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); 743 if (rc == -1) { 744 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno); 745 assert(0, "perfstat_memory_total() failed"); 746 return false; 747 } 748 749 assert(rc == 1, "perfstat_memory_total() - weird return code"); 750 751 // excerpt from 752 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 753 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 754 // The fields of perfstat_memory_total_t: 755 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). 756 // u_longlong_t real_total Total real memory (in 4 KB pages). 757 // u_longlong_t real_free Free real memory (in 4 KB pages). 758 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). 759 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). 760 761 pmi->virt_total = psmt.virt_total * 4096; 762 pmi->real_total = psmt.real_total * 4096; 763 pmi->real_free = psmt.real_free * 4096; 764 pmi->pgsp_total = psmt.pgsp_total * 4096; 765 pmi->pgsp_free = psmt.pgsp_free * 4096; 766 767 return true; 768 769 } 770 } // end os::Aix::get_meminfo 771 772 ////////////////////////////////////////////////////////////////////////////// 773 // create new thread 774 775 // Thread start routine for all newly created threads 776 static void *thread_native_entry(Thread *thread) { 777 778 thread->record_stack_base_and_size(); 779 780 const pthread_t pthread_id = ::pthread_self(); 781 const tid_t kernel_thread_id = ::thread_self(); 782 783 LogTarget(Info, os, thread) lt; 784 if (lt.is_enabled()) { 785 address low_address = thread->stack_end(); 786 address high_address = thread->stack_base(); 787 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT 788 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).", 789 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address, 790 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); 791 } 792 793 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() 794 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party 795 // tools hook pthread_create(). In this case, we may run into problems establishing 796 // guard pages on those stacks, because the stacks may reside in memory which is not 797 // protectable (shmated). 798 if (thread->stack_base() > ::sbrk(0)) { 799 log_warning(os, thread)("Thread stack not in data segment."); 800 } 801 802 // Try to randomize the cache line index of hot stack frames. 803 // This helps when threads of the same stack traces evict each other's 804 // cache lines. The threads can be either from the same JVM instance, or 805 // from different JVM instances. The benefit is especially true for 806 // processors with hyperthreading technology. 807 808 static int counter = 0; 809 int pid = os::current_process_id(); 810 alloca(((pid ^ counter++) & 7) * 128); 811 812 thread->initialize_thread_current(); 813 814 OSThread* osthread = thread->osthread(); 815 816 // Thread_id is pthread id. 817 osthread->set_thread_id(pthread_id); 818 819 // .. but keep kernel thread id too for diagnostics 820 osthread->set_kernel_thread_id(kernel_thread_id); 821 822 // Initialize signal mask for this thread. 823 os::Aix::hotspot_sigmask(thread); 824 825 // Initialize floating point control register. 826 os::Aix::init_thread_fpu_state(); 827 828 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); 829 830 // Call one more level start routine. 831 thread->call_run(); 832 833 // Note: at this point the thread object may already have deleted itself. 834 // Prevent dereferencing it from here on out. 835 thread = NULL; 836 837 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 838 os::current_thread_id(), (uintx) kernel_thread_id); 839 840 return 0; 841 } 842 843 bool os::create_thread(Thread* thread, ThreadType thr_type, 844 size_t req_stack_size) { 845 846 assert(thread->osthread() == NULL, "caller responsible"); 847 848 // Allocate the OSThread object. 849 OSThread* osthread = new OSThread(NULL, NULL); 850 if (osthread == NULL) { 851 return false; 852 } 853 854 // Set the correct thread state. 855 osthread->set_thread_type(thr_type); 856 857 // Initial state is ALLOCATED but not INITIALIZED 858 osthread->set_state(ALLOCATED); 859 860 thread->set_osthread(osthread); 861 862 // Init thread attributes. 863 pthread_attr_t attr; 864 pthread_attr_init(&attr); 865 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); 866 867 // Make sure we run in 1:1 kernel-user-thread mode. 868 if (os::Aix::on_aix()) { 869 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); 870 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); 871 } 872 873 // Start in suspended state, and in os::thread_start, wake the thread up. 874 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); 875 876 // Calculate stack size if it's not specified by caller. 877 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 878 879 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) 880 // the real thread stack size may be smaller than the requested stack size, by as much as 64K. 881 // This very much looks like a pthread lib error. As a workaround, increase the stack size 882 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB) 883 if (stack_size < 4096 * K) { 884 stack_size += 64 * K; 885 } 886 887 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the 888 // thread size in attr unchanged. If this is the minimal stack size as set 889 // by pthread_attr_init this leads to crashes after thread creation. E.g. the 890 // guard pages might not fit on the tiny stack created. 891 int ret = pthread_attr_setstacksize(&attr, stack_size); 892 if (ret != 0) { 893 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k", 894 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "), 895 stack_size / K); 896 thread->set_osthread(NULL); 897 delete osthread; 898 return false; 899 } 900 901 // Save some cycles and a page by disabling OS guard pages where we have our own 902 // VM guard pages (in java threads). For other threads, keep system default guard 903 // pages in place. 904 if (thr_type == java_thread || thr_type == compiler_thread) { 905 ret = pthread_attr_setguardsize(&attr, 0); 906 } 907 908 pthread_t tid = 0; 909 if (ret == 0) { 910 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 911 } 912 913 if (ret == 0) { 914 char buf[64]; 915 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 916 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 917 } else { 918 char buf[64]; 919 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.", 920 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 921 // Log some OS information which might explain why creating the thread failed. 922 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 923 LogStream st(Log(os, thread)::info()); 924 os::Posix::print_rlimit_info(&st); 925 os::print_memory_info(&st); 926 } 927 928 pthread_attr_destroy(&attr); 929 930 if (ret != 0) { 931 // Need to clean up stuff we've allocated so far. 932 thread->set_osthread(NULL); 933 delete osthread; 934 return false; 935 } 936 937 // OSThread::thread_id is the pthread id. 938 osthread->set_thread_id(tid); 939 940 return true; 941 } 942 943 ///////////////////////////////////////////////////////////////////////////// 944 // attach existing thread 945 946 // bootstrap the main thread 947 bool os::create_main_thread(JavaThread* thread) { 948 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); 949 return create_attached_thread(thread); 950 } 951 952 bool os::create_attached_thread(JavaThread* thread) { 953 #ifdef ASSERT 954 thread->verify_not_published(); 955 #endif 956 957 // Allocate the OSThread object 958 OSThread* osthread = new OSThread(NULL, NULL); 959 960 if (osthread == NULL) { 961 return false; 962 } 963 964 const pthread_t pthread_id = ::pthread_self(); 965 const tid_t kernel_thread_id = ::thread_self(); 966 967 // OSThread::thread_id is the pthread id. 968 osthread->set_thread_id(pthread_id); 969 970 // .. but keep kernel thread id too for diagnostics 971 osthread->set_kernel_thread_id(kernel_thread_id); 972 973 // initialize floating point control register 974 os::Aix::init_thread_fpu_state(); 975 976 // Initial thread state is RUNNABLE 977 osthread->set_state(RUNNABLE); 978 979 thread->set_osthread(osthread); 980 981 if (UseNUMA) { 982 int lgrp_id = os::numa_get_group_id(); 983 if (lgrp_id != -1) { 984 thread->set_lgrp_id(lgrp_id); 985 } 986 } 987 988 // initialize signal mask for this thread 989 // and save the caller's signal mask 990 os::Aix::hotspot_sigmask(thread); 991 992 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 993 os::current_thread_id(), (uintx) kernel_thread_id); 994 995 return true; 996 } 997 998 void os::pd_start_thread(Thread* thread) { 999 int status = pthread_continue_np(thread->osthread()->pthread_id()); 1000 assert(status == 0, "thr_continue failed"); 1001 } 1002 1003 // Free OS resources related to the OSThread 1004 void os::free_thread(OSThread* osthread) { 1005 assert(osthread != NULL, "osthread not set"); 1006 1007 // We are told to free resources of the argument thread, 1008 // but we can only really operate on the current thread. 1009 assert(Thread::current()->osthread() == osthread, 1010 "os::free_thread but not current thread"); 1011 1012 // Restore caller's signal mask 1013 sigset_t sigmask = osthread->caller_sigmask(); 1014 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1015 1016 delete osthread; 1017 } 1018 1019 //////////////////////////////////////////////////////////////////////////////// 1020 // time support 1021 1022 // Time since start-up in seconds to a fine granularity. 1023 // Used by VMSelfDestructTimer and the MemProfiler. 1024 double os::elapsedTime() { 1025 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution 1026 } 1027 1028 jlong os::elapsed_counter() { 1029 return javaTimeNanos() - initial_time_count; 1030 } 1031 1032 jlong os::elapsed_frequency() { 1033 return NANOSECS_PER_SEC; // nanosecond resolution 1034 } 1035 1036 bool os::supports_vtime() { return true; } 1037 bool os::enable_vtime() { return false; } 1038 bool os::vtime_enabled() { return false; } 1039 1040 double os::elapsedVTime() { 1041 struct rusage usage; 1042 int retval = getrusage(RUSAGE_THREAD, &usage); 1043 if (retval == 0) { 1044 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1045 } else { 1046 // better than nothing, but not much 1047 return elapsedTime(); 1048 } 1049 } 1050 1051 jlong os::javaTimeMillis() { 1052 timeval time; 1053 int status = gettimeofday(&time, NULL); 1054 assert(status != -1, "aix error at gettimeofday()"); 1055 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1056 } 1057 1058 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1059 timeval time; 1060 int status = gettimeofday(&time, NULL); 1061 assert(status != -1, "aix error at gettimeofday()"); 1062 seconds = jlong(time.tv_sec); 1063 nanos = jlong(time.tv_usec) * 1000; 1064 } 1065 1066 // We use mread_real_time here. 1067 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1068 // it has to be converted to real time. AIX documentations suggests to do 1069 // this unconditionally, so we do it. 1070 // 1071 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1072 // 1073 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1074 // conversion is necessary. However, mread_real_time will not return 1075 // monotonic results but merely matches read_real_time. So we need a tweak 1076 // to ensure monotonic results. 1077 // 1078 // For PASE no public documentation exists, just word by IBM 1079 jlong os::javaTimeNanos() { 1080 timebasestruct_t time; 1081 int rc = mread_real_time(&time, TIMEBASE_SZ); 1082 if (os::Aix::on_pase()) { 1083 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1084 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1085 jlong prev = max_real_time; 1086 if (now <= prev) { 1087 return prev; // same or retrograde time; 1088 } 1089 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev); 1090 assert(obsv >= prev, "invariant"); // Monotonicity 1091 // If the CAS succeeded then we're done and return "now". 1092 // If the CAS failed and the observed value "obsv" is >= now then 1093 // we should return "obsv". If the CAS failed and now > obsv > prv then 1094 // some other thread raced this thread and installed a new value, in which case 1095 // we could either (a) retry the entire operation, (b) retry trying to install now 1096 // or (c) just return obsv. We use (c). No loop is required although in some cases 1097 // we might discard a higher "now" value in deference to a slightly lower but freshly 1098 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1099 // to (a) or (b) -- and greatly reduces coherence traffic. 1100 // We might also condition (c) on the magnitude of the delta between obsv and now. 1101 // Avoiding excessive CAS operations to hot RW locations is critical. 1102 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1103 return (prev == obsv) ? now : obsv; 1104 } else { 1105 if (rc != RTC_POWER) { 1106 rc = time_base_to_time(&time, TIMEBASE_SZ); 1107 assert(rc != -1, "error calling time_base_to_time()"); 1108 } 1109 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1110 } 1111 } 1112 1113 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1114 info_ptr->max_value = ALL_64_BITS; 1115 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1116 info_ptr->may_skip_backward = false; 1117 info_ptr->may_skip_forward = false; 1118 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1119 } 1120 1121 // Return the real, user, and system times in seconds from an 1122 // arbitrary fixed point in the past. 1123 bool os::getTimesSecs(double* process_real_time, 1124 double* process_user_time, 1125 double* process_system_time) { 1126 struct tms ticks; 1127 clock_t real_ticks = times(&ticks); 1128 1129 if (real_ticks == (clock_t) (-1)) { 1130 return false; 1131 } else { 1132 double ticks_per_second = (double) clock_tics_per_sec; 1133 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1134 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1135 *process_real_time = ((double) real_ticks) / ticks_per_second; 1136 1137 return true; 1138 } 1139 } 1140 1141 char * os::local_time_string(char *buf, size_t buflen) { 1142 struct tm t; 1143 time_t long_time; 1144 time(&long_time); 1145 localtime_r(&long_time, &t); 1146 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1147 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1148 t.tm_hour, t.tm_min, t.tm_sec); 1149 return buf; 1150 } 1151 1152 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1153 return localtime_r(clock, res); 1154 } 1155 1156 //////////////////////////////////////////////////////////////////////////////// 1157 // runtime exit support 1158 1159 // Note: os::shutdown() might be called very early during initialization, or 1160 // called from signal handler. Before adding something to os::shutdown(), make 1161 // sure it is async-safe and can handle partially initialized VM. 1162 void os::shutdown() { 1163 1164 // allow PerfMemory to attempt cleanup of any persistent resources 1165 perfMemory_exit(); 1166 1167 // needs to remove object in file system 1168 AttachListener::abort(); 1169 1170 // flush buffered output, finish log files 1171 ostream_abort(); 1172 1173 // Check for abort hook 1174 abort_hook_t abort_hook = Arguments::abort_hook(); 1175 if (abort_hook != NULL) { 1176 abort_hook(); 1177 } 1178 } 1179 1180 // Note: os::abort() might be called very early during initialization, or 1181 // called from signal handler. Before adding something to os::abort(), make 1182 // sure it is async-safe and can handle partially initialized VM. 1183 void os::abort(bool dump_core, void* siginfo, const void* context) { 1184 os::shutdown(); 1185 if (dump_core) { 1186 #ifndef PRODUCT 1187 fdStream out(defaultStream::output_fd()); 1188 out.print_raw("Current thread is "); 1189 char buf[16]; 1190 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1191 out.print_raw_cr(buf); 1192 out.print_raw_cr("Dumping core ..."); 1193 #endif 1194 ::abort(); // dump core 1195 } 1196 1197 ::exit(1); 1198 } 1199 1200 // Die immediately, no exit hook, no abort hook, no cleanup. 1201 // Dump a core file, if possible, for debugging. 1202 void os::die() { 1203 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1204 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1205 // and don't take the time to generate a core file. 1206 os::signal_raise(SIGKILL); 1207 } else { 1208 ::abort(); 1209 } 1210 } 1211 1212 intx os::current_thread_id() { 1213 return (intx)pthread_self(); 1214 } 1215 1216 int os::current_process_id() { 1217 return getpid(); 1218 } 1219 1220 // DLL functions 1221 1222 const char* os::dll_file_extension() { return ".so"; } 1223 1224 // This must be hard coded because it's the system's temporary 1225 // directory not the java application's temp directory, ala java.io.tmpdir. 1226 const char* os::get_temp_directory() { return "/tmp"; } 1227 1228 // Check if addr is inside libjvm.so. 1229 bool os::address_is_in_vm(address addr) { 1230 1231 // Input could be a real pc or a function pointer literal. The latter 1232 // would be a function descriptor residing in the data segment of a module. 1233 loaded_module_t lm; 1234 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1235 return lm.is_in_vm; 1236 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1237 return lm.is_in_vm; 1238 } else { 1239 return false; 1240 } 1241 1242 } 1243 1244 // Resolve an AIX function descriptor literal to a code pointer. 1245 // If the input is a valid code pointer to a text segment of a loaded module, 1246 // it is returned unchanged. 1247 // If the input is a valid AIX function descriptor, it is resolved to the 1248 // code entry point. 1249 // If the input is neither a valid function descriptor nor a valid code pointer, 1250 // NULL is returned. 1251 static address resolve_function_descriptor_to_code_pointer(address p) { 1252 1253 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1254 // It is a real code pointer. 1255 return p; 1256 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1257 // Pointer to data segment, potential function descriptor. 1258 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1259 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1260 // It is a function descriptor. 1261 return code_entry; 1262 } 1263 } 1264 1265 return NULL; 1266 } 1267 1268 bool os::dll_address_to_function_name(address addr, char *buf, 1269 int buflen, int *offset, 1270 bool demangle) { 1271 if (offset) { 1272 *offset = -1; 1273 } 1274 // Buf is not optional, but offset is optional. 1275 assert(buf != NULL, "sanity check"); 1276 buf[0] = '\0'; 1277 1278 // Resolve function ptr literals first. 1279 addr = resolve_function_descriptor_to_code_pointer(addr); 1280 if (!addr) { 1281 return false; 1282 } 1283 1284 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1285 } 1286 1287 bool os::dll_address_to_library_name(address addr, char* buf, 1288 int buflen, int* offset) { 1289 if (offset) { 1290 *offset = -1; 1291 } 1292 // Buf is not optional, but offset is optional. 1293 assert(buf != NULL, "sanity check"); 1294 buf[0] = '\0'; 1295 1296 // Resolve function ptr literals first. 1297 addr = resolve_function_descriptor_to_code_pointer(addr); 1298 if (!addr) { 1299 return false; 1300 } 1301 1302 return AixSymbols::get_module_name(addr, buf, buflen); 1303 } 1304 1305 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1306 // for the same architecture as Hotspot is running on. 1307 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1308 1309 log_info(os)("attempting shared library load of %s", filename); 1310 1311 if (ebuf && ebuflen > 0) { 1312 ebuf[0] = '\0'; 1313 ebuf[ebuflen - 1] = '\0'; 1314 } 1315 1316 if (!filename || strlen(filename) == 0) { 1317 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1318 return NULL; 1319 } 1320 1321 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1322 void * result= ::dlopen(filename, RTLD_LAZY); 1323 if (result != NULL) { 1324 Events::log(NULL, "Loaded shared library %s", filename); 1325 // Reload dll cache. Don't do this in signal handling. 1326 LoadedLibraries::reload(); 1327 log_info(os)("shared library load of %s was successful", filename); 1328 return result; 1329 } else { 1330 // error analysis when dlopen fails 1331 const char* error_report = ::dlerror(); 1332 if (error_report == NULL) { 1333 error_report = "dlerror returned no error description"; 1334 } 1335 if (ebuf != NULL && ebuflen > 0) { 1336 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1337 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1338 } 1339 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1340 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1341 } 1342 return NULL; 1343 } 1344 1345 void* os::dll_lookup(void* handle, const char* name) { 1346 void* res = dlsym(handle, name); 1347 return res; 1348 } 1349 1350 void* os::get_default_process_handle() { 1351 return (void*)::dlopen(NULL, RTLD_LAZY); 1352 } 1353 1354 void os::print_dll_info(outputStream *st) { 1355 st->print_cr("Dynamic libraries:"); 1356 LoadedLibraries::print(st); 1357 } 1358 1359 void os::get_summary_os_info(char* buf, size_t buflen) { 1360 // There might be something more readable than uname results for AIX. 1361 struct utsname name; 1362 uname(&name); 1363 snprintf(buf, buflen, "%s %s", name.release, name.version); 1364 } 1365 1366 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1367 // Not yet implemented. 1368 return 0; 1369 } 1370 1371 void os::print_os_info_brief(outputStream* st) { 1372 uint32_t ver = os::Aix::os_version(); 1373 st->print_cr("AIX kernel version %u.%u.%u.%u", 1374 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1375 1376 os::Posix::print_uname_info(st); 1377 1378 // Linux uses print_libversion_info(st); here. 1379 } 1380 1381 void os::print_os_info(outputStream* st) { 1382 st->print("OS:"); 1383 1384 os::Posix::print_uname_info(st); 1385 1386 uint32_t ver = os::Aix::os_version(); 1387 st->print_cr("AIX kernel version %u.%u.%u.%u", 1388 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1389 1390 os::Posix::print_rlimit_info(st); 1391 1392 os::Posix::print_load_average(st); 1393 1394 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process. 1395 long tmax = sysconf(_SC_THREAD_THREADS_MAX); 1396 st->print_cr("maximum #threads within a process:%ld", tmax); 1397 1398 // print wpar info 1399 libperfstat::wparinfo_t wi; 1400 if (libperfstat::get_wparinfo(&wi)) { 1401 st->print_cr("wpar info"); 1402 st->print_cr("name: %s", wi.name); 1403 st->print_cr("id: %d", wi.wpar_id); 1404 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1405 } 1406 1407 VM_Version::print_platform_virtualization_info(st); 1408 } 1409 1410 void os::print_memory_info(outputStream* st) { 1411 1412 st->print_cr("Memory:"); 1413 1414 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1415 describe_pagesize(g_multipage_support.pagesize)); 1416 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1417 describe_pagesize(g_multipage_support.datapsize)); 1418 st->print_cr(" Text page size: %s", 1419 describe_pagesize(g_multipage_support.textpsize)); 1420 st->print_cr(" Thread stack page size (pthread): %s", 1421 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1422 st->print_cr(" Default shared memory page size: %s", 1423 describe_pagesize(g_multipage_support.shmpsize)); 1424 st->print_cr(" Can use 64K pages dynamically with shared memory: %s", 1425 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1426 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1427 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1428 st->print_cr(" Multipage error: %d", 1429 g_multipage_support.error); 1430 st->cr(); 1431 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1432 1433 // print out LDR_CNTRL because it affects the default page sizes 1434 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1435 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1436 1437 // Print out EXTSHM because it is an unsupported setting. 1438 const char* const extshm = ::getenv("EXTSHM"); 1439 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1440 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1441 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1442 } 1443 1444 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1445 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1446 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1447 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1448 st->cr(); 1449 1450 os::Aix::meminfo_t mi; 1451 if (os::Aix::get_meminfo(&mi)) { 1452 if (os::Aix::on_aix()) { 1453 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1454 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1455 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1456 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1457 } else { 1458 // PASE - Numbers are result of QWCRSSTS; they mean: 1459 // real_total: Sum of all system pools 1460 // real_free: always 0 1461 // pgsp_total: we take the size of the system ASP 1462 // pgsp_free: size of system ASP times percentage of system ASP unused 1463 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1464 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1465 st->print_cr("%% system asp used : %.2f", 1466 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1467 } 1468 } 1469 st->cr(); 1470 1471 // Print program break. 1472 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1473 address brk_now = (address)::sbrk(0); 1474 if (brk_now != (address)-1) { 1475 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1476 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1477 } 1478 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1479 st->cr(); 1480 1481 // Print segments allocated with os::reserve_memory. 1482 st->print_cr("internal virtual memory regions used by vm:"); 1483 vmembk_print_on(st); 1484 } 1485 1486 // Get a string for the cpuinfo that is a summary of the cpu type 1487 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1488 // read _system_configuration.version 1489 switch (_system_configuration.version) { 1490 case PV_9: 1491 strncpy(buf, "Power PC 9", buflen); 1492 break; 1493 case PV_8: 1494 strncpy(buf, "Power PC 8", buflen); 1495 break; 1496 case PV_7: 1497 strncpy(buf, "Power PC 7", buflen); 1498 break; 1499 case PV_6_1: 1500 strncpy(buf, "Power PC 6 DD1.x", buflen); 1501 break; 1502 case PV_6: 1503 strncpy(buf, "Power PC 6", buflen); 1504 break; 1505 case PV_5: 1506 strncpy(buf, "Power PC 5", buflen); 1507 break; 1508 case PV_5_2: 1509 strncpy(buf, "Power PC 5_2", buflen); 1510 break; 1511 case PV_5_3: 1512 strncpy(buf, "Power PC 5_3", buflen); 1513 break; 1514 case PV_5_Compat: 1515 strncpy(buf, "PV_5_Compat", buflen); 1516 break; 1517 case PV_6_Compat: 1518 strncpy(buf, "PV_6_Compat", buflen); 1519 break; 1520 case PV_7_Compat: 1521 strncpy(buf, "PV_7_Compat", buflen); 1522 break; 1523 case PV_8_Compat: 1524 strncpy(buf, "PV_8_Compat", buflen); 1525 break; 1526 case PV_9_Compat: 1527 strncpy(buf, "PV_9_Compat", buflen); 1528 break; 1529 default: 1530 strncpy(buf, "unknown", buflen); 1531 } 1532 } 1533 1534 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1535 // Nothing to do beyond of what os::print_cpu_info() does. 1536 } 1537 1538 static void print_signal_handler(outputStream* st, int sig, 1539 char* buf, size_t buflen); 1540 1541 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1542 st->print_cr("Signal Handlers:"); 1543 print_signal_handler(st, SIGSEGV, buf, buflen); 1544 print_signal_handler(st, SIGBUS , buf, buflen); 1545 print_signal_handler(st, SIGFPE , buf, buflen); 1546 print_signal_handler(st, SIGPIPE, buf, buflen); 1547 print_signal_handler(st, SIGXFSZ, buf, buflen); 1548 print_signal_handler(st, SIGILL , buf, buflen); 1549 print_signal_handler(st, SR_signum, buf, buflen); 1550 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1551 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1552 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1553 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1554 print_signal_handler(st, SIGTRAP, buf, buflen); 1555 // We also want to know if someone else adds a SIGDANGER handler because 1556 // that will interfere with OOM killling. 1557 print_signal_handler(st, SIGDANGER, buf, buflen); 1558 } 1559 1560 static char saved_jvm_path[MAXPATHLEN] = {0}; 1561 1562 // Find the full path to the current module, libjvm.so. 1563 void os::jvm_path(char *buf, jint buflen) { 1564 // Error checking. 1565 if (buflen < MAXPATHLEN) { 1566 assert(false, "must use a large-enough buffer"); 1567 buf[0] = '\0'; 1568 return; 1569 } 1570 // Lazy resolve the path to current module. 1571 if (saved_jvm_path[0] != 0) { 1572 strcpy(buf, saved_jvm_path); 1573 return; 1574 } 1575 1576 Dl_info dlinfo; 1577 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1578 assert(ret != 0, "cannot locate libjvm"); 1579 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1580 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1581 1582 if (Arguments::sun_java_launcher_is_altjvm()) { 1583 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1584 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1585 // If "/jre/lib/" appears at the right place in the string, then 1586 // assume we are installed in a JDK and we're done. Otherwise, check 1587 // for a JAVA_HOME environment variable and fix up the path so it 1588 // looks like libjvm.so is installed there (append a fake suffix 1589 // hotspot/libjvm.so). 1590 const char *p = buf + strlen(buf) - 1; 1591 for (int count = 0; p > buf && count < 4; ++count) { 1592 for (--p; p > buf && *p != '/'; --p) 1593 /* empty */ ; 1594 } 1595 1596 if (strncmp(p, "/jre/lib/", 9) != 0) { 1597 // Look for JAVA_HOME in the environment. 1598 char* java_home_var = ::getenv("JAVA_HOME"); 1599 if (java_home_var != NULL && java_home_var[0] != 0) { 1600 char* jrelib_p; 1601 int len; 1602 1603 // Check the current module name "libjvm.so". 1604 p = strrchr(buf, '/'); 1605 if (p == NULL) { 1606 return; 1607 } 1608 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1609 1610 rp = os::Posix::realpath(java_home_var, buf, buflen); 1611 if (rp == NULL) { 1612 return; 1613 } 1614 1615 // determine if this is a legacy image or modules image 1616 // modules image doesn't have "jre" subdirectory 1617 len = strlen(buf); 1618 assert(len < buflen, "Ran out of buffer room"); 1619 jrelib_p = buf + len; 1620 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1621 if (0 != access(buf, F_OK)) { 1622 snprintf(jrelib_p, buflen-len, "/lib"); 1623 } 1624 1625 if (0 == access(buf, F_OK)) { 1626 // Use current module name "libjvm.so" 1627 len = strlen(buf); 1628 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1629 } else { 1630 // Go back to path of .so 1631 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1632 if (rp == NULL) { 1633 return; 1634 } 1635 } 1636 } 1637 } 1638 } 1639 1640 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1641 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1642 } 1643 1644 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1645 // no prefix required, not even "_" 1646 } 1647 1648 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1649 // no suffix required 1650 } 1651 1652 //////////////////////////////////////////////////////////////////////////////// 1653 // sun.misc.Signal support 1654 1655 static void 1656 UserHandler(int sig, void *siginfo, void *context) { 1657 // Ctrl-C is pressed during error reporting, likely because the error 1658 // handler fails to abort. Let VM die immediately. 1659 if (sig == SIGINT && VMError::is_error_reported()) { 1660 os::die(); 1661 } 1662 1663 os::signal_notify(sig); 1664 } 1665 1666 void* os::user_handler() { 1667 return CAST_FROM_FN_PTR(void*, UserHandler); 1668 } 1669 1670 extern "C" { 1671 typedef void (*sa_handler_t)(int); 1672 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1673 } 1674 1675 void* os::signal(int signal_number, void* handler) { 1676 struct sigaction sigAct, oldSigAct; 1677 1678 sigfillset(&(sigAct.sa_mask)); 1679 1680 // Do not block out synchronous signals in the signal handler. 1681 // Blocking synchronous signals only makes sense if you can really 1682 // be sure that those signals won't happen during signal handling, 1683 // when the blocking applies. Normal signal handlers are lean and 1684 // do not cause signals. But our signal handlers tend to be "risky" 1685 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1686 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1687 // by a SIGILL, which was blocked due to the signal mask. The process 1688 // just hung forever. Better to crash from a secondary signal than to hang. 1689 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1690 sigdelset(&(sigAct.sa_mask), SIGBUS); 1691 sigdelset(&(sigAct.sa_mask), SIGILL); 1692 sigdelset(&(sigAct.sa_mask), SIGFPE); 1693 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1694 1695 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1696 1697 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1698 1699 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1700 // -1 means registration failed 1701 return (void *)-1; 1702 } 1703 1704 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1705 } 1706 1707 void os::signal_raise(int signal_number) { 1708 ::raise(signal_number); 1709 } 1710 1711 // 1712 // The following code is moved from os.cpp for making this 1713 // code platform specific, which it is by its very nature. 1714 // 1715 1716 // Will be modified when max signal is changed to be dynamic 1717 int os::sigexitnum_pd() { 1718 return NSIG; 1719 } 1720 1721 // a counter for each possible signal value 1722 static volatile jint pending_signals[NSIG+1] = { 0 }; 1723 1724 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1725 // On AIX, we use sem_init(), sem_post(), sem_wait() 1726 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1727 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1728 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1729 // on AIX, msem_..() calls are suspected of causing problems. 1730 static sem_t sig_sem; 1731 static msemaphore* p_sig_msem = 0; 1732 1733 static void local_sem_init() { 1734 if (os::Aix::on_aix()) { 1735 int rc = ::sem_init(&sig_sem, 0, 0); 1736 guarantee(rc != -1, "sem_init failed"); 1737 } else { 1738 // Memory semaphores must live in shared mem. 1739 guarantee0(p_sig_msem == NULL); 1740 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1741 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1742 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1743 } 1744 } 1745 1746 static void local_sem_post() { 1747 static bool warn_only_once = false; 1748 if (os::Aix::on_aix()) { 1749 int rc = ::sem_post(&sig_sem); 1750 if (rc == -1 && !warn_only_once) { 1751 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1752 warn_only_once = true; 1753 } 1754 } else { 1755 guarantee0(p_sig_msem != NULL); 1756 int rc = ::msem_unlock(p_sig_msem, 0); 1757 if (rc == -1 && !warn_only_once) { 1758 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1759 warn_only_once = true; 1760 } 1761 } 1762 } 1763 1764 static void local_sem_wait() { 1765 static bool warn_only_once = false; 1766 if (os::Aix::on_aix()) { 1767 int rc = ::sem_wait(&sig_sem); 1768 if (rc == -1 && !warn_only_once) { 1769 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1770 warn_only_once = true; 1771 } 1772 } else { 1773 guarantee0(p_sig_msem != NULL); // must init before use 1774 int rc = ::msem_lock(p_sig_msem, 0); 1775 if (rc == -1 && !warn_only_once) { 1776 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1777 warn_only_once = true; 1778 } 1779 } 1780 } 1781 1782 static void jdk_misc_signal_init() { 1783 // Initialize signal structures 1784 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1785 1786 // Initialize signal semaphore 1787 local_sem_init(); 1788 } 1789 1790 void os::signal_notify(int sig) { 1791 Atomic::inc(&pending_signals[sig]); 1792 local_sem_post(); 1793 } 1794 1795 static int check_pending_signals() { 1796 for (;;) { 1797 for (int i = 0; i < NSIG + 1; i++) { 1798 jint n = pending_signals[i]; 1799 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1800 return i; 1801 } 1802 } 1803 JavaThread *thread = JavaThread::current(); 1804 ThreadBlockInVM tbivm(thread); 1805 1806 bool threadIsSuspended; 1807 do { 1808 thread->set_suspend_equivalent(); 1809 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1810 1811 local_sem_wait(); 1812 1813 // were we externally suspended while we were waiting? 1814 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1815 if (threadIsSuspended) { 1816 // 1817 // The semaphore has been incremented, but while we were waiting 1818 // another thread suspended us. We don't want to continue running 1819 // while suspended because that would surprise the thread that 1820 // suspended us. 1821 // 1822 1823 local_sem_post(); 1824 1825 thread->java_suspend_self(); 1826 } 1827 } while (threadIsSuspended); 1828 } 1829 } 1830 1831 int os::signal_wait() { 1832 return check_pending_signals(); 1833 } 1834 1835 //////////////////////////////////////////////////////////////////////////////// 1836 // Virtual Memory 1837 1838 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1839 1840 #define VMEM_MAPPED 1 1841 #define VMEM_SHMATED 2 1842 1843 struct vmembk_t { 1844 int type; // 1 - mmap, 2 - shmat 1845 char* addr; 1846 size_t size; // Real size, may be larger than usersize. 1847 size_t pagesize; // page size of area 1848 vmembk_t* next; 1849 1850 bool contains_addr(char* p) const { 1851 return p >= addr && p < (addr + size); 1852 } 1853 1854 bool contains_range(char* p, size_t s) const { 1855 return contains_addr(p) && contains_addr(p + s - 1); 1856 } 1857 1858 void print_on(outputStream* os) const { 1859 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1860 " bytes, %d %s pages), %s", 1861 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1862 (type == VMEM_SHMATED ? "shmat" : "mmap") 1863 ); 1864 } 1865 1866 // Check that range is a sub range of memory block (or equal to memory block); 1867 // also check that range is fully page aligned to the page size if the block. 1868 void assert_is_valid_subrange(char* p, size_t s) const { 1869 if (!contains_range(p, s)) { 1870 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1871 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1872 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size)); 1873 guarantee0(false); 1874 } 1875 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1876 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1877 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize); 1878 guarantee0(false); 1879 } 1880 } 1881 }; 1882 1883 static struct { 1884 vmembk_t* first; 1885 MiscUtils::CritSect cs; 1886 } vmem; 1887 1888 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1889 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1890 assert0(p); 1891 if (p) { 1892 MiscUtils::AutoCritSect lck(&vmem.cs); 1893 p->addr = addr; p->size = size; 1894 p->pagesize = pagesize; 1895 p->type = type; 1896 p->next = vmem.first; 1897 vmem.first = p; 1898 } 1899 } 1900 1901 static vmembk_t* vmembk_find(char* addr) { 1902 MiscUtils::AutoCritSect lck(&vmem.cs); 1903 for (vmembk_t* p = vmem.first; p; p = p->next) { 1904 if (p->addr <= addr && (p->addr + p->size) > addr) { 1905 return p; 1906 } 1907 } 1908 return NULL; 1909 } 1910 1911 static void vmembk_remove(vmembk_t* p0) { 1912 MiscUtils::AutoCritSect lck(&vmem.cs); 1913 assert0(p0); 1914 assert0(vmem.first); // List should not be empty. 1915 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1916 if (*pp == p0) { 1917 *pp = p0->next; 1918 ::free(p0); 1919 return; 1920 } 1921 } 1922 assert0(false); // Not found? 1923 } 1924 1925 static void vmembk_print_on(outputStream* os) { 1926 MiscUtils::AutoCritSect lck(&vmem.cs); 1927 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1928 vmi->print_on(os); 1929 os->cr(); 1930 } 1931 } 1932 1933 // Reserve and attach a section of System V memory. 1934 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1935 // address. Failing that, it will attach the memory anywhere. 1936 // If <requested_addr> is NULL, function will attach the memory anywhere. 1937 // 1938 // <alignment_hint> is being ignored by this function. It is very probable however that the 1939 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1940 // Should this be not enogh, we can put more work into it. 1941 static char* reserve_shmated_memory ( 1942 size_t bytes, 1943 char* requested_addr, 1944 size_t alignment_hint) { 1945 1946 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1947 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1948 bytes, p2i(requested_addr), alignment_hint); 1949 1950 // Either give me wish address or wish alignment but not both. 1951 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1952 1953 // We must prevent anyone from attaching too close to the 1954 // BRK because that may cause malloc OOM. 1955 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1956 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1957 "Will attach anywhere.", p2i(requested_addr)); 1958 // Act like the OS refused to attach there. 1959 requested_addr = NULL; 1960 } 1961 1962 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1963 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1964 if (os::Aix::on_pase_V5R4_or_older()) { 1965 ShouldNotReachHere(); 1966 } 1967 1968 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 1969 const size_t size = align_up(bytes, 64*K); 1970 1971 // Reserve the shared segment. 1972 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 1973 if (shmid == -1) { 1974 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 1975 return NULL; 1976 } 1977 1978 // Important note: 1979 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 1980 // We must right after attaching it remove it from the system. System V shm segments are global and 1981 // survive the process. 1982 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 1983 1984 struct shmid_ds shmbuf; 1985 memset(&shmbuf, 0, sizeof(shmbuf)); 1986 shmbuf.shm_pagesize = 64*K; 1987 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 1988 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 1989 size / (64*K), errno); 1990 // I want to know if this ever happens. 1991 assert(false, "failed to set page size for shmat"); 1992 } 1993 1994 // Now attach the shared segment. 1995 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 1996 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 1997 // were not a segment boundary. 1998 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 1999 const int errno_shmat = errno; 2000 2001 // (A) Right after shmat and before handing shmat errors delete the shm segment. 2002 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 2003 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 2004 assert(false, "failed to remove shared memory segment!"); 2005 } 2006 2007 // Handle shmat error. If we failed to attach, just return. 2008 if (addr == (char*)-1) { 2009 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat); 2010 return NULL; 2011 } 2012 2013 // Just for info: query the real page size. In case setting the page size did not 2014 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2015 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2016 if (real_pagesize != shmbuf.shm_pagesize) { 2017 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize); 2018 } 2019 2020 if (addr) { 2021 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2022 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize)); 2023 } else { 2024 if (requested_addr != NULL) { 2025 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr)); 2026 } else { 2027 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2028 } 2029 } 2030 2031 // book-keeping 2032 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2033 assert0(is_aligned_to(addr, os::vm_page_size())); 2034 2035 return addr; 2036 } 2037 2038 static bool release_shmated_memory(char* addr, size_t size) { 2039 2040 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2041 p2i(addr), p2i(addr + size - 1)); 2042 2043 bool rc = false; 2044 2045 // TODO: is there a way to verify shm size without doing bookkeeping? 2046 if (::shmdt(addr) != 0) { 2047 trcVerbose("error (%d).", errno); 2048 } else { 2049 trcVerbose("ok."); 2050 rc = true; 2051 } 2052 return rc; 2053 } 2054 2055 static bool uncommit_shmated_memory(char* addr, size_t size) { 2056 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2057 p2i(addr), p2i(addr + size - 1)); 2058 2059 const bool rc = my_disclaim64(addr, size); 2060 2061 if (!rc) { 2062 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size); 2063 return false; 2064 } 2065 return true; 2066 } 2067 2068 //////////////////////////////// mmap-based routines ///////////////////////////////// 2069 2070 // Reserve memory via mmap. 2071 // If <requested_addr> is given, an attempt is made to attach at the given address. 2072 // Failing that, memory is allocated at any address. 2073 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2074 // allocate at an address aligned with the given alignment. Failing that, memory 2075 // is aligned anywhere. 2076 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2077 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2078 "alignment_hint " UINTX_FORMAT "...", 2079 bytes, p2i(requested_addr), alignment_hint); 2080 2081 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2082 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2083 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr)); 2084 return NULL; 2085 } 2086 2087 // We must prevent anyone from attaching too close to the 2088 // BRK because that may cause malloc OOM. 2089 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2090 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2091 "Will attach anywhere.", p2i(requested_addr)); 2092 // Act like the OS refused to attach there. 2093 requested_addr = NULL; 2094 } 2095 2096 // Specify one or the other but not both. 2097 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2098 2099 // In 64K mode, we claim the global page size (os::vm_page_size()) 2100 // is 64K. This is one of the few points where that illusion may 2101 // break, because mmap() will always return memory aligned to 4K. So 2102 // we must ensure we only ever return memory aligned to 64k. 2103 if (alignment_hint) { 2104 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2105 } else { 2106 alignment_hint = os::vm_page_size(); 2107 } 2108 2109 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2110 const size_t size = align_up(bytes, os::vm_page_size()); 2111 2112 // alignment: Allocate memory large enough to include an aligned range of the right size and 2113 // cut off the leading and trailing waste pages. 2114 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2115 const size_t extra_size = size + alignment_hint; 2116 2117 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2118 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2119 int flags = MAP_ANONYMOUS | MAP_SHARED; 2120 2121 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2122 // it means if wishaddress is given but MAP_FIXED is not set. 2123 // 2124 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2125 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2126 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2127 // get clobbered. 2128 if (requested_addr != NULL) { 2129 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2130 flags |= MAP_FIXED; 2131 } 2132 } 2133 2134 char* addr = (char*)::mmap(requested_addr, extra_size, 2135 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2136 2137 if (addr == MAP_FAILED) { 2138 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno); 2139 return NULL; 2140 } 2141 2142 // Handle alignment. 2143 char* const addr_aligned = align_up(addr, alignment_hint); 2144 const size_t waste_pre = addr_aligned - addr; 2145 char* const addr_aligned_end = addr_aligned + size; 2146 const size_t waste_post = extra_size - waste_pre - size; 2147 if (waste_pre > 0) { 2148 ::munmap(addr, waste_pre); 2149 } 2150 if (waste_post > 0) { 2151 ::munmap(addr_aligned_end, waste_post); 2152 } 2153 addr = addr_aligned; 2154 2155 if (addr) { 2156 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2157 p2i(addr), p2i(addr + bytes), bytes); 2158 } else { 2159 if (requested_addr != NULL) { 2160 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr)); 2161 } else { 2162 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2163 } 2164 } 2165 2166 // bookkeeping 2167 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2168 2169 // Test alignment, see above. 2170 assert0(is_aligned_to(addr, os::vm_page_size())); 2171 2172 return addr; 2173 } 2174 2175 static bool release_mmaped_memory(char* addr, size_t size) { 2176 assert0(is_aligned_to(addr, os::vm_page_size())); 2177 assert0(is_aligned_to(size, os::vm_page_size())); 2178 2179 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2180 p2i(addr), p2i(addr + size - 1)); 2181 bool rc = false; 2182 2183 if (::munmap(addr, size) != 0) { 2184 trcVerbose("failed (%d)\n", errno); 2185 rc = false; 2186 } else { 2187 trcVerbose("ok."); 2188 rc = true; 2189 } 2190 2191 return rc; 2192 } 2193 2194 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2195 2196 assert0(is_aligned_to(addr, os::vm_page_size())); 2197 assert0(is_aligned_to(size, os::vm_page_size())); 2198 2199 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2200 p2i(addr), p2i(addr + size - 1)); 2201 bool rc = false; 2202 2203 // Uncommit mmap memory with msync MS_INVALIDATE. 2204 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2205 trcVerbose("failed (%d)\n", errno); 2206 rc = false; 2207 } else { 2208 trcVerbose("ok."); 2209 rc = true; 2210 } 2211 2212 return rc; 2213 } 2214 2215 int os::vm_page_size() { 2216 // Seems redundant as all get out. 2217 assert(os::Aix::page_size() != -1, "must call os::init"); 2218 return os::Aix::page_size(); 2219 } 2220 2221 // Aix allocates memory by pages. 2222 int os::vm_allocation_granularity() { 2223 assert(os::Aix::page_size() != -1, "must call os::init"); 2224 return os::Aix::page_size(); 2225 } 2226 2227 #ifdef PRODUCT 2228 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2229 int err) { 2230 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2231 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec, 2232 os::errno_name(err), err); 2233 } 2234 #endif 2235 2236 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2237 const char* mesg) { 2238 assert(mesg != NULL, "mesg must be specified"); 2239 if (!pd_commit_memory(addr, size, exec)) { 2240 // Add extra info in product mode for vm_exit_out_of_memory(): 2241 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2242 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2243 } 2244 } 2245 2246 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2247 2248 assert(is_aligned_to(addr, os::vm_page_size()), 2249 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2250 p2i(addr), os::vm_page_size()); 2251 assert(is_aligned_to(size, os::vm_page_size()), 2252 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2253 size, os::vm_page_size()); 2254 2255 vmembk_t* const vmi = vmembk_find(addr); 2256 guarantee0(vmi); 2257 vmi->assert_is_valid_subrange(addr, size); 2258 2259 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); 2260 2261 if (UseExplicitCommit) { 2262 // AIX commits memory on touch. So, touch all pages to be committed. 2263 for (char* p = addr; p < (addr + size); p += 4*K) { 2264 *p = '\0'; 2265 } 2266 } 2267 2268 return true; 2269 } 2270 2271 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2272 return pd_commit_memory(addr, size, exec); 2273 } 2274 2275 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2276 size_t alignment_hint, bool exec, 2277 const char* mesg) { 2278 // Alignment_hint is ignored on this OS. 2279 pd_commit_memory_or_exit(addr, size, exec, mesg); 2280 } 2281 2282 bool os::pd_uncommit_memory(char* addr, size_t size) { 2283 assert(is_aligned_to(addr, os::vm_page_size()), 2284 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2285 p2i(addr), os::vm_page_size()); 2286 assert(is_aligned_to(size, os::vm_page_size()), 2287 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2288 size, os::vm_page_size()); 2289 2290 // Dynamically do different things for mmap/shmat. 2291 const vmembk_t* const vmi = vmembk_find(addr); 2292 guarantee0(vmi); 2293 vmi->assert_is_valid_subrange(addr, size); 2294 2295 if (vmi->type == VMEM_SHMATED) { 2296 return uncommit_shmated_memory(addr, size); 2297 } else { 2298 return uncommit_mmaped_memory(addr, size); 2299 } 2300 } 2301 2302 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2303 // Do not call this; no need to commit stack pages on AIX. 2304 ShouldNotReachHere(); 2305 return true; 2306 } 2307 2308 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2309 // Do not call this; no need to commit stack pages on AIX. 2310 ShouldNotReachHere(); 2311 return true; 2312 } 2313 2314 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2315 } 2316 2317 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2318 } 2319 2320 void os::numa_make_global(char *addr, size_t bytes) { 2321 } 2322 2323 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2324 } 2325 2326 bool os::numa_topology_changed() { 2327 return false; 2328 } 2329 2330 size_t os::numa_get_groups_num() { 2331 return 1; 2332 } 2333 2334 int os::numa_get_group_id() { 2335 return 0; 2336 } 2337 2338 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2339 if (size > 0) { 2340 ids[0] = 0; 2341 return 1; 2342 } 2343 return 0; 2344 } 2345 2346 bool os::get_page_info(char *start, page_info* info) { 2347 return false; 2348 } 2349 2350 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2351 return end; 2352 } 2353 2354 // Reserves and attaches a shared memory segment. 2355 // Will assert if a wish address is given and could not be obtained. 2356 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2357 2358 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2359 // thereby clobbering old mappings at that place. That is probably 2360 // not intended, never used and almost certainly an error were it 2361 // ever be used this way (to try attaching at a specified address 2362 // without clobbering old mappings an alternate API exists, 2363 // os::attempt_reserve_memory_at()). 2364 // Instead of mimicking the dangerous coding of the other platforms, here I 2365 // just ignore the request address (release) or assert(debug). 2366 assert0(requested_addr == NULL); 2367 2368 // Always round to os::vm_page_size(), which may be larger than 4K. 2369 bytes = align_up(bytes, os::vm_page_size()); 2370 const size_t alignment_hint0 = 2371 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2372 2373 // In 4K mode always use mmap. 2374 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2375 if (os::vm_page_size() == 4*K) { 2376 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2377 } else { 2378 if (bytes >= Use64KPagesThreshold) { 2379 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2380 } else { 2381 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2382 } 2383 } 2384 } 2385 2386 bool os::pd_release_memory(char* addr, size_t size) { 2387 2388 // Dynamically do different things for mmap/shmat. 2389 vmembk_t* const vmi = vmembk_find(addr); 2390 guarantee0(vmi); 2391 2392 // Always round to os::vm_page_size(), which may be larger than 4K. 2393 size = align_up(size, os::vm_page_size()); 2394 addr = align_up(addr, os::vm_page_size()); 2395 2396 bool rc = false; 2397 bool remove_bookkeeping = false; 2398 if (vmi->type == VMEM_SHMATED) { 2399 // For shmatted memory, we do: 2400 // - If user wants to release the whole range, release the memory (shmdt). 2401 // - If user only wants to release a partial range, uncommit (disclaim) that 2402 // range. That way, at least, we do not use memory anymore (bust still page 2403 // table space). 2404 vmi->assert_is_valid_subrange(addr, size); 2405 if (addr == vmi->addr && size == vmi->size) { 2406 rc = release_shmated_memory(addr, size); 2407 remove_bookkeeping = true; 2408 } else { 2409 rc = uncommit_shmated_memory(addr, size); 2410 } 2411 } else { 2412 // User may unmap partial regions but region has to be fully contained. 2413 #ifdef ASSERT 2414 vmi->assert_is_valid_subrange(addr, size); 2415 #endif 2416 rc = release_mmaped_memory(addr, size); 2417 remove_bookkeeping = true; 2418 } 2419 2420 // update bookkeeping 2421 if (rc && remove_bookkeeping) { 2422 vmembk_remove(vmi); 2423 } 2424 2425 return rc; 2426 } 2427 2428 static bool checked_mprotect(char* addr, size_t size, int prot) { 2429 2430 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2431 // not tell me if protection failed when trying to protect an un-protectable range. 2432 // 2433 // This means if the memory was allocated using shmget/shmat, protection wont work 2434 // but mprotect will still return 0: 2435 // 2436 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2437 2438 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2439 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2440 2441 if (!rc) { 2442 const char* const s_errno = os::errno_name(errno); 2443 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2444 return false; 2445 } 2446 2447 // mprotect success check 2448 // 2449 // Mprotect said it changed the protection but can I believe it? 2450 // 2451 // To be sure I need to check the protection afterwards. Try to 2452 // read from protected memory and check whether that causes a segfault. 2453 // 2454 if (!os::Aix::xpg_sus_mode()) { 2455 2456 if (CanUseSafeFetch32()) { 2457 2458 const bool read_protected = 2459 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2460 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2461 2462 if (prot & PROT_READ) { 2463 rc = !read_protected; 2464 } else { 2465 rc = read_protected; 2466 } 2467 2468 if (!rc) { 2469 if (os::Aix::on_pase()) { 2470 // There is an issue on older PASE systems where mprotect() will return success but the 2471 // memory will not be protected. 2472 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2473 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2474 // a stack. It is an OS error. 2475 // 2476 // A valid strategy is just to try again. This usually works. :-/ 2477 2478 ::usleep(1000); 2479 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2480 if (::mprotect(addr, size, prot) == 0) { 2481 const bool read_protected_2 = 2482 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2483 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2484 rc = true; 2485 } 2486 } 2487 } 2488 } 2489 } 2490 2491 assert(rc == true, "mprotect failed."); 2492 2493 return rc; 2494 } 2495 2496 // Set protections specified 2497 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2498 unsigned int p = 0; 2499 switch (prot) { 2500 case MEM_PROT_NONE: p = PROT_NONE; break; 2501 case MEM_PROT_READ: p = PROT_READ; break; 2502 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2503 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2504 default: 2505 ShouldNotReachHere(); 2506 } 2507 // is_committed is unused. 2508 return checked_mprotect(addr, size, p); 2509 } 2510 2511 bool os::guard_memory(char* addr, size_t size) { 2512 return checked_mprotect(addr, size, PROT_NONE); 2513 } 2514 2515 bool os::unguard_memory(char* addr, size_t size) { 2516 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2517 } 2518 2519 // Large page support 2520 2521 static size_t _large_page_size = 0; 2522 2523 // Enable large page support if OS allows that. 2524 void os::large_page_init() { 2525 return; // Nothing to do. See query_multipage_support and friends. 2526 } 2527 2528 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2529 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement 2530 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()), 2531 // so this is not needed. 2532 assert(false, "should not be called on AIX"); 2533 return NULL; 2534 } 2535 2536 bool os::release_memory_special(char* base, size_t bytes) { 2537 // Detaching the SHM segment will also delete it, see reserve_memory_special(). 2538 Unimplemented(); 2539 return false; 2540 } 2541 2542 size_t os::large_page_size() { 2543 return _large_page_size; 2544 } 2545 2546 bool os::can_commit_large_page_memory() { 2547 // Does not matter, we do not support huge pages. 2548 return false; 2549 } 2550 2551 bool os::can_execute_large_page_memory() { 2552 // Does not matter, we do not support huge pages. 2553 return false; 2554 } 2555 2556 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2557 assert(file_desc >= 0, "file_desc is not valid"); 2558 char* result = NULL; 2559 2560 // Always round to os::vm_page_size(), which may be larger than 4K. 2561 bytes = align_up(bytes, os::vm_page_size()); 2562 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2563 2564 if (result != NULL) { 2565 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2566 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2567 } 2568 } 2569 return result; 2570 } 2571 2572 // Reserve memory at an arbitrary address, only if that area is 2573 // available (and not reserved for something else). 2574 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2575 char* addr = NULL; 2576 2577 // Always round to os::vm_page_size(), which may be larger than 4K. 2578 bytes = align_up(bytes, os::vm_page_size()); 2579 2580 // In 4K mode always use mmap. 2581 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2582 if (os::vm_page_size() == 4*K) { 2583 return reserve_mmaped_memory(bytes, requested_addr, 0); 2584 } else { 2585 if (bytes >= Use64KPagesThreshold) { 2586 return reserve_shmated_memory(bytes, requested_addr, 0); 2587 } else { 2588 return reserve_mmaped_memory(bytes, requested_addr, 0); 2589 } 2590 } 2591 2592 return addr; 2593 } 2594 2595 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2596 void os::infinite_sleep() { 2597 while (true) { // sleep forever ... 2598 ::sleep(100); // ... 100 seconds at a time 2599 } 2600 } 2601 2602 // Used to convert frequent JVM_Yield() to nops 2603 bool os::dont_yield() { 2604 return DontYieldALot; 2605 } 2606 2607 void os::naked_yield() { 2608 sched_yield(); 2609 } 2610 2611 //////////////////////////////////////////////////////////////////////////////// 2612 // thread priority support 2613 2614 // From AIX manpage to pthread_setschedparam 2615 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2616 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2617 // 2618 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2619 // range from 40 to 80, where 40 is the least favored priority and 80 2620 // is the most favored." 2621 // 2622 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2623 // scheduling there; however, this still leaves iSeries.) 2624 // 2625 // We use the same values for AIX and PASE. 2626 int os::java_to_os_priority[CriticalPriority + 1] = { 2627 54, // 0 Entry should never be used 2628 2629 55, // 1 MinPriority 2630 55, // 2 2631 56, // 3 2632 2633 56, // 4 2634 57, // 5 NormPriority 2635 57, // 6 2636 2637 58, // 7 2638 58, // 8 2639 59, // 9 NearMaxPriority 2640 2641 60, // 10 MaxPriority 2642 2643 60 // 11 CriticalPriority 2644 }; 2645 2646 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2647 if (!UseThreadPriorities) return OS_OK; 2648 pthread_t thr = thread->osthread()->pthread_id(); 2649 int policy = SCHED_OTHER; 2650 struct sched_param param; 2651 param.sched_priority = newpri; 2652 int ret = pthread_setschedparam(thr, policy, ¶m); 2653 2654 if (ret != 0) { 2655 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2656 (int)thr, newpri, ret, os::errno_name(ret)); 2657 } 2658 return (ret == 0) ? OS_OK : OS_ERR; 2659 } 2660 2661 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2662 if (!UseThreadPriorities) { 2663 *priority_ptr = java_to_os_priority[NormPriority]; 2664 return OS_OK; 2665 } 2666 pthread_t thr = thread->osthread()->pthread_id(); 2667 int policy = SCHED_OTHER; 2668 struct sched_param param; 2669 int ret = pthread_getschedparam(thr, &policy, ¶m); 2670 *priority_ptr = param.sched_priority; 2671 2672 return (ret == 0) ? OS_OK : OS_ERR; 2673 } 2674 2675 //////////////////////////////////////////////////////////////////////////////// 2676 // suspend/resume support 2677 2678 // The low-level signal-based suspend/resume support is a remnant from the 2679 // old VM-suspension that used to be for java-suspension, safepoints etc, 2680 // within hotspot. Currently used by JFR's OSThreadSampler 2681 // 2682 // The remaining code is greatly simplified from the more general suspension 2683 // code that used to be used. 2684 // 2685 // The protocol is quite simple: 2686 // - suspend: 2687 // - sends a signal to the target thread 2688 // - polls the suspend state of the osthread using a yield loop 2689 // - target thread signal handler (SR_handler) sets suspend state 2690 // and blocks in sigsuspend until continued 2691 // - resume: 2692 // - sets target osthread state to continue 2693 // - sends signal to end the sigsuspend loop in the SR_handler 2694 // 2695 // Note that the SR_lock plays no role in this suspend/resume protocol, 2696 // but is checked for NULL in SR_handler as a thread termination indicator. 2697 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2698 // 2699 // Note that resume_clear_context() and suspend_save_context() are needed 2700 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2701 // which in part is used by: 2702 // - Forte Analyzer: AsyncGetCallTrace() 2703 // - StackBanging: get_frame_at_stack_banging_point() 2704 2705 static void resume_clear_context(OSThread *osthread) { 2706 osthread->set_ucontext(NULL); 2707 osthread->set_siginfo(NULL); 2708 } 2709 2710 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2711 osthread->set_ucontext(context); 2712 osthread->set_siginfo(siginfo); 2713 } 2714 2715 // 2716 // Handler function invoked when a thread's execution is suspended or 2717 // resumed. We have to be careful that only async-safe functions are 2718 // called here (Note: most pthread functions are not async safe and 2719 // should be avoided.) 2720 // 2721 // Note: sigwait() is a more natural fit than sigsuspend() from an 2722 // interface point of view, but sigwait() prevents the signal hander 2723 // from being run. libpthread would get very confused by not having 2724 // its signal handlers run and prevents sigwait()'s use with the 2725 // mutex granting granting signal. 2726 // 2727 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2728 // 2729 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2730 // Save and restore errno to avoid confusing native code with EINTR 2731 // after sigsuspend. 2732 int old_errno = errno; 2733 2734 Thread* thread = Thread::current_or_null_safe(); 2735 assert(thread != NULL, "Missing current thread in SR_handler"); 2736 2737 // On some systems we have seen signal delivery get "stuck" until the signal 2738 // mask is changed as part of thread termination. Check that the current thread 2739 // has not already terminated (via SR_lock()) - else the following assertion 2740 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2741 // destructor has completed. 2742 2743 if (thread->SR_lock() == NULL) { 2744 return; 2745 } 2746 2747 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2748 2749 OSThread* osthread = thread->osthread(); 2750 2751 os::SuspendResume::State current = osthread->sr.state(); 2752 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2753 suspend_save_context(osthread, siginfo, context); 2754 2755 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2756 os::SuspendResume::State state = osthread->sr.suspended(); 2757 if (state == os::SuspendResume::SR_SUSPENDED) { 2758 sigset_t suspend_set; // signals for sigsuspend() 2759 sigemptyset(&suspend_set); 2760 // get current set of blocked signals and unblock resume signal 2761 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2762 sigdelset(&suspend_set, SR_signum); 2763 2764 // wait here until we are resumed 2765 while (1) { 2766 sigsuspend(&suspend_set); 2767 2768 os::SuspendResume::State result = osthread->sr.running(); 2769 if (result == os::SuspendResume::SR_RUNNING) { 2770 break; 2771 } 2772 } 2773 2774 } else if (state == os::SuspendResume::SR_RUNNING) { 2775 // request was cancelled, continue 2776 } else { 2777 ShouldNotReachHere(); 2778 } 2779 2780 resume_clear_context(osthread); 2781 } else if (current == os::SuspendResume::SR_RUNNING) { 2782 // request was cancelled, continue 2783 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2784 // ignore 2785 } else { 2786 ShouldNotReachHere(); 2787 } 2788 2789 errno = old_errno; 2790 } 2791 2792 static int SR_initialize() { 2793 struct sigaction act; 2794 char *s; 2795 // Get signal number to use for suspend/resume 2796 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2797 int sig = ::strtol(s, 0, 10); 2798 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2799 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2800 SR_signum = sig; 2801 } else { 2802 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2803 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2804 } 2805 } 2806 2807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2809 2810 sigemptyset(&SR_sigset); 2811 sigaddset(&SR_sigset, SR_signum); 2812 2813 // Set up signal handler for suspend/resume. 2814 act.sa_flags = SA_RESTART|SA_SIGINFO; 2815 act.sa_handler = (void (*)(int)) SR_handler; 2816 2817 // SR_signum is blocked by default. 2818 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2819 2820 if (sigaction(SR_signum, &act, 0) == -1) { 2821 return -1; 2822 } 2823 2824 // Save signal flag 2825 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2826 return 0; 2827 } 2828 2829 static int SR_finalize() { 2830 return 0; 2831 } 2832 2833 static int sr_notify(OSThread* osthread) { 2834 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2835 assert_status(status == 0, status, "pthread_kill"); 2836 return status; 2837 } 2838 2839 // "Randomly" selected value for how long we want to spin 2840 // before bailing out on suspending a thread, also how often 2841 // we send a signal to a thread we want to resume 2842 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2843 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2844 2845 // returns true on success and false on error - really an error is fatal 2846 // but this seems the normal response to library errors 2847 static bool do_suspend(OSThread* osthread) { 2848 assert(osthread->sr.is_running(), "thread should be running"); 2849 // mark as suspended and send signal 2850 2851 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2852 // failed to switch, state wasn't running? 2853 ShouldNotReachHere(); 2854 return false; 2855 } 2856 2857 if (sr_notify(osthread) != 0) { 2858 // try to cancel, switch to running 2859 2860 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2861 if (result == os::SuspendResume::SR_RUNNING) { 2862 // cancelled 2863 return false; 2864 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2865 // somehow managed to suspend 2866 return true; 2867 } else { 2868 ShouldNotReachHere(); 2869 return false; 2870 } 2871 } 2872 2873 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2874 2875 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2876 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2877 os::naked_yield(); 2878 } 2879 2880 // timeout, try to cancel the request 2881 if (n >= RANDOMLY_LARGE_INTEGER) { 2882 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2883 if (cancelled == os::SuspendResume::SR_RUNNING) { 2884 return false; 2885 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2886 return true; 2887 } else { 2888 ShouldNotReachHere(); 2889 return false; 2890 } 2891 } 2892 } 2893 2894 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2895 return true; 2896 } 2897 2898 static void do_resume(OSThread* osthread) { 2899 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2900 2901 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2902 // failed to switch to WAKEUP_REQUEST 2903 ShouldNotReachHere(); 2904 return; 2905 } 2906 2907 while (!osthread->sr.is_running()) { 2908 if (sr_notify(osthread) == 0) { 2909 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2910 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2911 os::naked_yield(); 2912 } 2913 } 2914 } else { 2915 ShouldNotReachHere(); 2916 } 2917 } 2918 2919 guarantee(osthread->sr.is_running(), "Must be running!"); 2920 } 2921 2922 /////////////////////////////////////////////////////////////////////////////////// 2923 // signal handling (except suspend/resume) 2924 2925 // This routine may be used by user applications as a "hook" to catch signals. 2926 // The user-defined signal handler must pass unrecognized signals to this 2927 // routine, and if it returns true (non-zero), then the signal handler must 2928 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2929 // routine will never retun false (zero), but instead will execute a VM panic 2930 // routine kill the process. 2931 // 2932 // If this routine returns false, it is OK to call it again. This allows 2933 // the user-defined signal handler to perform checks either before or after 2934 // the VM performs its own checks. Naturally, the user code would be making 2935 // a serious error if it tried to handle an exception (such as a null check 2936 // or breakpoint) that the VM was generating for its own correct operation. 2937 // 2938 // This routine may recognize any of the following kinds of signals: 2939 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2940 // It should be consulted by handlers for any of those signals. 2941 // 2942 // The caller of this routine must pass in the three arguments supplied 2943 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2944 // field of the structure passed to sigaction(). This routine assumes that 2945 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2946 // 2947 // Note that the VM will print warnings if it detects conflicting signal 2948 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2949 // 2950 extern "C" JNIEXPORT int 2951 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 2952 2953 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 2954 // to be the thing to call; documentation is not terribly clear about whether 2955 // pthread_sigmask also works, and if it does, whether it does the same. 2956 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 2957 const int rc = ::pthread_sigmask(how, set, oset); 2958 // return value semantics differ slightly for error case: 2959 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 2960 // (so, pthread_sigmask is more theadsafe for error handling) 2961 // But success is always 0. 2962 return rc == 0 ? true : false; 2963 } 2964 2965 // Function to unblock all signals which are, according 2966 // to POSIX, typical program error signals. If they happen while being blocked, 2967 // they typically will bring down the process immediately. 2968 bool unblock_program_error_signals() { 2969 sigset_t set; 2970 ::sigemptyset(&set); 2971 ::sigaddset(&set, SIGILL); 2972 ::sigaddset(&set, SIGBUS); 2973 ::sigaddset(&set, SIGFPE); 2974 ::sigaddset(&set, SIGSEGV); 2975 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 2976 } 2977 2978 // Renamed from 'signalHandler' to avoid collision with other shared libs. 2979 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 2980 assert(info != NULL && uc != NULL, "it must be old kernel"); 2981 2982 // Never leave program error signals blocked; 2983 // on all our platforms they would bring down the process immediately when 2984 // getting raised while being blocked. 2985 unblock_program_error_signals(); 2986 2987 int orig_errno = errno; // Preserve errno value over signal handler. 2988 JVM_handle_aix_signal(sig, info, uc, true); 2989 errno = orig_errno; 2990 } 2991 2992 // This boolean allows users to forward their own non-matching signals 2993 // to JVM_handle_aix_signal, harmlessly. 2994 bool os::Aix::signal_handlers_are_installed = false; 2995 2996 // For signal-chaining 2997 bool os::Aix::libjsig_is_loaded = false; 2998 typedef struct sigaction *(*get_signal_t)(int); 2999 get_signal_t os::Aix::get_signal_action = NULL; 3000 3001 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3002 struct sigaction *actp = NULL; 3003 3004 if (libjsig_is_loaded) { 3005 // Retrieve the old signal handler from libjsig 3006 actp = (*get_signal_action)(sig); 3007 } 3008 if (actp == NULL) { 3009 // Retrieve the preinstalled signal handler from jvm 3010 actp = os::Posix::get_preinstalled_handler(sig); 3011 } 3012 3013 return actp; 3014 } 3015 3016 static bool call_chained_handler(struct sigaction *actp, int sig, 3017 siginfo_t *siginfo, void *context) { 3018 // Call the old signal handler 3019 if (actp->sa_handler == SIG_DFL) { 3020 // It's more reasonable to let jvm treat it as an unexpected exception 3021 // instead of taking the default action. 3022 return false; 3023 } else if (actp->sa_handler != SIG_IGN) { 3024 if ((actp->sa_flags & SA_NODEFER) == 0) { 3025 // automaticlly block the signal 3026 sigaddset(&(actp->sa_mask), sig); 3027 } 3028 3029 sa_handler_t hand = NULL; 3030 sa_sigaction_t sa = NULL; 3031 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3032 // retrieve the chained handler 3033 if (siginfo_flag_set) { 3034 sa = actp->sa_sigaction; 3035 } else { 3036 hand = actp->sa_handler; 3037 } 3038 3039 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3040 actp->sa_handler = SIG_DFL; 3041 } 3042 3043 // try to honor the signal mask 3044 sigset_t oset; 3045 sigemptyset(&oset); 3046 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3047 3048 // call into the chained handler 3049 if (siginfo_flag_set) { 3050 (*sa)(sig, siginfo, context); 3051 } else { 3052 (*hand)(sig); 3053 } 3054 3055 // restore the signal mask 3056 pthread_sigmask(SIG_SETMASK, &oset, NULL); 3057 } 3058 // Tell jvm's signal handler the signal is taken care of. 3059 return true; 3060 } 3061 3062 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3063 bool chained = false; 3064 // signal-chaining 3065 if (UseSignalChaining) { 3066 struct sigaction *actp = get_chained_signal_action(sig); 3067 if (actp != NULL) { 3068 chained = call_chained_handler(actp, sig, siginfo, context); 3069 } 3070 } 3071 return chained; 3072 } 3073 3074 // for diagnostic 3075 int sigflags[NSIG]; 3076 3077 int os::Aix::get_our_sigflags(int sig) { 3078 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3079 return sigflags[sig]; 3080 } 3081 3082 void os::Aix::set_our_sigflags(int sig, int flags) { 3083 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3084 if (sig > 0 && sig < NSIG) { 3085 sigflags[sig] = flags; 3086 } 3087 } 3088 3089 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3090 // Check for overwrite. 3091 struct sigaction oldAct; 3092 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3093 3094 void* oldhand = oldAct.sa_sigaction 3095 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3096 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3097 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3098 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3099 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3100 if (AllowUserSignalHandlers || !set_installed) { 3101 // Do not overwrite; user takes responsibility to forward to us. 3102 return; 3103 } else if (UseSignalChaining) { 3104 // save the old handler in jvm 3105 os::Posix::save_preinstalled_handler(sig, oldAct); 3106 // libjsig also interposes the sigaction() call below and saves the 3107 // old sigaction on it own. 3108 } else { 3109 fatal("Encountered unexpected pre-existing sigaction handler " 3110 "%#lx for signal %d.", (long)oldhand, sig); 3111 } 3112 } 3113 3114 struct sigaction sigAct; 3115 sigfillset(&(sigAct.sa_mask)); 3116 if (!set_installed) { 3117 sigAct.sa_handler = SIG_DFL; 3118 sigAct.sa_flags = SA_RESTART; 3119 } else { 3120 sigAct.sa_sigaction = javaSignalHandler; 3121 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3122 } 3123 // Save flags, which are set by ours 3124 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3125 sigflags[sig] = sigAct.sa_flags; 3126 3127 int ret = sigaction(sig, &sigAct, &oldAct); 3128 assert(ret == 0, "check"); 3129 3130 void* oldhand2 = oldAct.sa_sigaction 3131 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3132 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3133 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3134 } 3135 3136 // install signal handlers for signals that HotSpot needs to 3137 // handle in order to support Java-level exception handling. 3138 void os::Aix::install_signal_handlers() { 3139 if (!signal_handlers_are_installed) { 3140 signal_handlers_are_installed = true; 3141 3142 // signal-chaining 3143 typedef void (*signal_setting_t)(); 3144 signal_setting_t begin_signal_setting = NULL; 3145 signal_setting_t end_signal_setting = NULL; 3146 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3147 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3148 if (begin_signal_setting != NULL) { 3149 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3150 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3151 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3152 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3153 libjsig_is_loaded = true; 3154 assert(UseSignalChaining, "should enable signal-chaining"); 3155 } 3156 if (libjsig_is_loaded) { 3157 // Tell libjsig jvm is setting signal handlers. 3158 (*begin_signal_setting)(); 3159 } 3160 3161 set_signal_handler(SIGSEGV, true); 3162 set_signal_handler(SIGPIPE, true); 3163 set_signal_handler(SIGBUS, true); 3164 set_signal_handler(SIGILL, true); 3165 set_signal_handler(SIGFPE, true); 3166 set_signal_handler(SIGTRAP, true); 3167 set_signal_handler(SIGXFSZ, true); 3168 3169 if (libjsig_is_loaded) { 3170 // Tell libjsig jvm finishes setting signal handlers. 3171 (*end_signal_setting)(); 3172 } 3173 3174 // We don't activate signal checker if libjsig is in place, we trust ourselves 3175 // and if UserSignalHandler is installed all bets are off. 3176 // Log that signal checking is off only if -verbose:jni is specified. 3177 if (CheckJNICalls) { 3178 if (libjsig_is_loaded) { 3179 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3180 check_signals = false; 3181 } 3182 if (AllowUserSignalHandlers) { 3183 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3184 check_signals = false; 3185 } 3186 // Need to initialize check_signal_done. 3187 ::sigemptyset(&check_signal_done); 3188 } 3189 } 3190 } 3191 3192 static const char* get_signal_handler_name(address handler, 3193 char* buf, int buflen) { 3194 int offset; 3195 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3196 if (found) { 3197 // skip directory names 3198 const char *p1, *p2; 3199 p1 = buf; 3200 size_t len = strlen(os::file_separator()); 3201 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3202 // The way os::dll_address_to_library_name is implemented on Aix 3203 // right now, it always returns -1 for the offset which is not 3204 // terribly informative. 3205 // Will fix that. For now, omit the offset. 3206 jio_snprintf(buf, buflen, "%s", p1); 3207 } else { 3208 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3209 } 3210 return buf; 3211 } 3212 3213 static void print_signal_handler(outputStream* st, int sig, 3214 char* buf, size_t buflen) { 3215 struct sigaction sa; 3216 sigaction(sig, NULL, &sa); 3217 3218 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3219 3220 address handler = (sa.sa_flags & SA_SIGINFO) 3221 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3222 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3223 3224 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3225 st->print("SIG_DFL"); 3226 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3227 st->print("SIG_IGN"); 3228 } else { 3229 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3230 } 3231 3232 // Print readable mask. 3233 st->print(", sa_mask[0]="); 3234 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3235 3236 address rh = VMError::get_resetted_sighandler(sig); 3237 // May be, handler was resetted by VMError? 3238 if (rh != NULL) { 3239 handler = rh; 3240 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3241 } 3242 3243 // Print textual representation of sa_flags. 3244 st->print(", sa_flags="); 3245 os::Posix::print_sa_flags(st, sa.sa_flags); 3246 3247 // Check: is it our handler? 3248 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3249 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3250 // It is our signal handler. 3251 // Check for flags, reset system-used one! 3252 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3253 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3254 os::Aix::get_our_sigflags(sig)); 3255 } 3256 } 3257 st->cr(); 3258 } 3259 3260 #define DO_SIGNAL_CHECK(sig) \ 3261 if (!sigismember(&check_signal_done, sig)) \ 3262 os::Aix::check_signal_handler(sig) 3263 3264 // This method is a periodic task to check for misbehaving JNI applications 3265 // under CheckJNI, we can add any periodic checks here 3266 3267 void os::run_periodic_checks() { 3268 3269 if (check_signals == false) return; 3270 3271 // SEGV and BUS if overridden could potentially prevent 3272 // generation of hs*.log in the event of a crash, debugging 3273 // such a case can be very challenging, so we absolutely 3274 // check the following for a good measure: 3275 DO_SIGNAL_CHECK(SIGSEGV); 3276 DO_SIGNAL_CHECK(SIGILL); 3277 DO_SIGNAL_CHECK(SIGFPE); 3278 DO_SIGNAL_CHECK(SIGBUS); 3279 DO_SIGNAL_CHECK(SIGPIPE); 3280 DO_SIGNAL_CHECK(SIGXFSZ); 3281 if (UseSIGTRAP) { 3282 DO_SIGNAL_CHECK(SIGTRAP); 3283 } 3284 3285 // ReduceSignalUsage allows the user to override these handlers 3286 // see comments at the very top and jvm_md.h 3287 if (!ReduceSignalUsage) { 3288 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3289 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3290 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3291 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3292 } 3293 3294 DO_SIGNAL_CHECK(SR_signum); 3295 } 3296 3297 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3298 3299 static os_sigaction_t os_sigaction = NULL; 3300 3301 void os::Aix::check_signal_handler(int sig) { 3302 char buf[O_BUFLEN]; 3303 address jvmHandler = NULL; 3304 3305 struct sigaction act; 3306 if (os_sigaction == NULL) { 3307 // only trust the default sigaction, in case it has been interposed 3308 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3309 if (os_sigaction == NULL) return; 3310 } 3311 3312 os_sigaction(sig, (struct sigaction*)NULL, &act); 3313 3314 address thisHandler = (act.sa_flags & SA_SIGINFO) 3315 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3316 : CAST_FROM_FN_PTR(address, act.sa_handler); 3317 3318 switch(sig) { 3319 case SIGSEGV: 3320 case SIGBUS: 3321 case SIGFPE: 3322 case SIGPIPE: 3323 case SIGILL: 3324 case SIGXFSZ: 3325 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3326 break; 3327 3328 case SHUTDOWN1_SIGNAL: 3329 case SHUTDOWN2_SIGNAL: 3330 case SHUTDOWN3_SIGNAL: 3331 case BREAK_SIGNAL: 3332 jvmHandler = (address)user_handler(); 3333 break; 3334 3335 default: 3336 if (sig == SR_signum) { 3337 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3338 } else { 3339 return; 3340 } 3341 break; 3342 } 3343 3344 if (thisHandler != jvmHandler) { 3345 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3346 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3347 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3348 // No need to check this sig any longer 3349 sigaddset(&check_signal_done, sig); 3350 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3351 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3352 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3353 exception_name(sig, buf, O_BUFLEN)); 3354 } 3355 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3356 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3357 tty->print("expected:"); 3358 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3359 tty->cr(); 3360 tty->print(" found:"); 3361 os::Posix::print_sa_flags(tty, act.sa_flags); 3362 tty->cr(); 3363 // No need to check this sig any longer 3364 sigaddset(&check_signal_done, sig); 3365 } 3366 3367 // Dump all the signal 3368 if (sigismember(&check_signal_done, sig)) { 3369 print_signal_handlers(tty, buf, O_BUFLEN); 3370 } 3371 } 3372 3373 // To install functions for atexit system call 3374 extern "C" { 3375 static void perfMemory_exit_helper() { 3376 perfMemory_exit(); 3377 } 3378 } 3379 3380 // This is called _before_ the most of global arguments have been parsed. 3381 void os::init(void) { 3382 // This is basic, we want to know if that ever changes. 3383 // (Shared memory boundary is supposed to be a 256M aligned.) 3384 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3385 3386 // Record process break at startup. 3387 g_brk_at_startup = (address) ::sbrk(0); 3388 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3389 3390 // First off, we need to know whether we run on AIX or PASE, and 3391 // the OS level we run on. 3392 os::Aix::initialize_os_info(); 3393 3394 // Scan environment (SPEC1170 behaviour, etc). 3395 os::Aix::scan_environment(); 3396 3397 // Probe multipage support. 3398 query_multipage_support(); 3399 3400 // Act like we only have one page size by eliminating corner cases which 3401 // we did not support very well anyway. 3402 // We have two input conditions: 3403 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3404 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3405 // setting. 3406 // Data segment page size is important for us because it defines the thread stack page 3407 // size, which is needed for guard page handling, stack banging etc. 3408 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3409 // and should be allocated with 64k pages. 3410 // 3411 // So, we do the following: 3412 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3413 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3414 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3415 // 64k no --- AIX 5.2 ? --- 3416 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3417 3418 // We explicitly leave no option to change page size, because only upgrading would work, 3419 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3420 3421 if (g_multipage_support.datapsize == 4*K) { 3422 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3423 if (g_multipage_support.can_use_64K_pages) { 3424 // .. but we are able to use 64K pages dynamically. 3425 // This would be typical for java launchers which are not linked 3426 // with datapsize=64K (like, any other launcher but our own). 3427 // 3428 // In this case it would be smart to allocate the java heap with 64K 3429 // to get the performance benefit, and to fake 64k pages for the 3430 // data segment (when dealing with thread stacks). 3431 // 3432 // However, leave a possibility to downgrade to 4K, using 3433 // -XX:-Use64KPages. 3434 if (Use64KPages) { 3435 trcVerbose("64K page mode (faked for data segment)"); 3436 Aix::_page_size = 64*K; 3437 } else { 3438 trcVerbose("4K page mode (Use64KPages=off)"); 3439 Aix::_page_size = 4*K; 3440 } 3441 } else { 3442 // .. and not able to allocate 64k pages dynamically. Here, just 3443 // fall back to 4K paged mode and use mmap for everything. 3444 trcVerbose("4K page mode"); 3445 Aix::_page_size = 4*K; 3446 FLAG_SET_ERGO(Use64KPages, false); 3447 } 3448 } else { 3449 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3450 // This normally means that we can allocate 64k pages dynamically. 3451 // (There is one special case where this may be false: EXTSHM=on. 3452 // but we decided to not support that mode). 3453 assert0(g_multipage_support.can_use_64K_pages); 3454 Aix::_page_size = 64*K; 3455 trcVerbose("64K page mode"); 3456 FLAG_SET_ERGO(Use64KPages, true); 3457 } 3458 3459 // For now UseLargePages is just ignored. 3460 FLAG_SET_ERGO(UseLargePages, false); 3461 _page_sizes[0] = 0; 3462 3463 // debug trace 3464 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3465 3466 // Next, we need to initialize libo4 and libperfstat libraries. 3467 if (os::Aix::on_pase()) { 3468 os::Aix::initialize_libo4(); 3469 } else { 3470 os::Aix::initialize_libperfstat(); 3471 } 3472 3473 // Reset the perfstat information provided by ODM. 3474 if (os::Aix::on_aix()) { 3475 libperfstat::perfstat_reset(); 3476 } 3477 3478 // Now initialze basic system properties. Note that for some of the values we 3479 // need libperfstat etc. 3480 os::Aix::initialize_system_info(); 3481 3482 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3483 3484 init_random(1234567); 3485 3486 // _main_thread points to the thread that created/loaded the JVM. 3487 Aix::_main_thread = pthread_self(); 3488 3489 initial_time_count = javaTimeNanos(); 3490 3491 os::Posix::init(); 3492 } 3493 3494 // This is called _after_ the global arguments have been parsed. 3495 jint os::init_2(void) { 3496 3497 // This could be set after os::Posix::init() but all platforms 3498 // have to set it the same so we have to mirror Solaris. 3499 DEBUG_ONLY(os::set_mutex_init_done();) 3500 3501 os::Posix::init_2(); 3502 3503 if (os::Aix::on_pase()) { 3504 trcVerbose("Running on PASE."); 3505 } else { 3506 trcVerbose("Running on AIX (not PASE)."); 3507 } 3508 3509 trcVerbose("processor count: %d", os::_processor_count); 3510 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3511 3512 // Initially build up the loaded dll map. 3513 LoadedLibraries::reload(); 3514 if (Verbose) { 3515 trcVerbose("Loaded Libraries: "); 3516 LoadedLibraries::print(tty); 3517 } 3518 3519 // initialize suspend/resume support - must do this before signal_sets_init() 3520 if (SR_initialize() != 0) { 3521 perror("SR_initialize failed"); 3522 return JNI_ERR; 3523 } 3524 3525 Aix::signal_sets_init(); 3526 Aix::install_signal_handlers(); 3527 // Initialize data for jdk.internal.misc.Signal 3528 if (!ReduceSignalUsage) { 3529 jdk_misc_signal_init(); 3530 } 3531 3532 // Check and sets minimum stack sizes against command line options 3533 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3534 return JNI_ERR; 3535 } 3536 3537 if (UseNUMA) { 3538 UseNUMA = false; 3539 warning("NUMA optimizations are not available on this OS."); 3540 } 3541 3542 if (MaxFDLimit) { 3543 // Set the number of file descriptors to max. print out error 3544 // if getrlimit/setrlimit fails but continue regardless. 3545 struct rlimit nbr_files; 3546 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3547 if (status != 0) { 3548 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3549 } else { 3550 nbr_files.rlim_cur = nbr_files.rlim_max; 3551 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3552 if (status != 0) { 3553 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3554 } 3555 } 3556 } 3557 3558 if (PerfAllowAtExitRegistration) { 3559 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3560 // At exit functions can be delayed until process exit time, which 3561 // can be problematic for embedded VM situations. Embedded VMs should 3562 // call DestroyJavaVM() to assure that VM resources are released. 3563 3564 // Note: perfMemory_exit_helper atexit function may be removed in 3565 // the future if the appropriate cleanup code can be added to the 3566 // VM_Exit VMOperation's doit method. 3567 if (atexit(perfMemory_exit_helper) != 0) { 3568 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3569 } 3570 } 3571 3572 return JNI_OK; 3573 } 3574 3575 // Mark the polling page as unreadable 3576 void os::make_polling_page_unreadable(void) { 3577 if (!guard_memory((char*)_polling_page, Aix::page_size())) { 3578 fatal("Could not disable polling page"); 3579 } 3580 }; 3581 3582 // Mark the polling page as readable 3583 void os::make_polling_page_readable(void) { 3584 // Changed according to os_linux.cpp. 3585 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { 3586 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page); 3587 } 3588 }; 3589 3590 int os::active_processor_count() { 3591 // User has overridden the number of active processors 3592 if (ActiveProcessorCount > 0) { 3593 log_trace(os)("active_processor_count: " 3594 "active processor count set by user : %d", 3595 ActiveProcessorCount); 3596 return ActiveProcessorCount; 3597 } 3598 3599 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3600 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3601 return online_cpus; 3602 } 3603 3604 void os::set_native_thread_name(const char *name) { 3605 // Not yet implemented. 3606 return; 3607 } 3608 3609 bool os::distribute_processes(uint length, uint* distribution) { 3610 // Not yet implemented. 3611 return false; 3612 } 3613 3614 bool os::bind_to_processor(uint processor_id) { 3615 // Not yet implemented. 3616 return false; 3617 } 3618 3619 void os::SuspendedThreadTask::internal_do_task() { 3620 if (do_suspend(_thread->osthread())) { 3621 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3622 do_task(context); 3623 do_resume(_thread->osthread()); 3624 } 3625 } 3626 3627 //////////////////////////////////////////////////////////////////////////////// 3628 // debug support 3629 3630 bool os::find(address addr, outputStream* st) { 3631 3632 st->print(PTR_FORMAT ": ", addr); 3633 3634 loaded_module_t lm; 3635 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3636 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3637 st->print_cr("%s", lm.path); 3638 return true; 3639 } 3640 3641 return false; 3642 } 3643 3644 //////////////////////////////////////////////////////////////////////////////// 3645 // misc 3646 3647 // This does not do anything on Aix. This is basically a hook for being 3648 // able to use structured exception handling (thread-local exception filters) 3649 // on, e.g., Win32. 3650 void 3651 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3652 JavaCallArguments* args, Thread* thread) { 3653 f(value, method, args, thread); 3654 } 3655 3656 void os::print_statistics() { 3657 } 3658 3659 bool os::message_box(const char* title, const char* message) { 3660 int i; 3661 fdStream err(defaultStream::error_fd()); 3662 for (i = 0; i < 78; i++) err.print_raw("="); 3663 err.cr(); 3664 err.print_raw_cr(title); 3665 for (i = 0; i < 78; i++) err.print_raw("-"); 3666 err.cr(); 3667 err.print_raw_cr(message); 3668 for (i = 0; i < 78; i++) err.print_raw("="); 3669 err.cr(); 3670 3671 char buf[16]; 3672 // Prevent process from exiting upon "read error" without consuming all CPU 3673 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3674 3675 return buf[0] == 'y' || buf[0] == 'Y'; 3676 } 3677 3678 // Is a (classpath) directory empty? 3679 bool os::dir_is_empty(const char* path) { 3680 DIR *dir = NULL; 3681 struct dirent *ptr; 3682 3683 dir = opendir(path); 3684 if (dir == NULL) return true; 3685 3686 /* Scan the directory */ 3687 bool result = true; 3688 while (result && (ptr = readdir(dir)) != NULL) { 3689 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3690 result = false; 3691 } 3692 } 3693 closedir(dir); 3694 return result; 3695 } 3696 3697 // This code originates from JDK's sysOpen and open64_w 3698 // from src/solaris/hpi/src/system_md.c 3699 3700 int os::open(const char *path, int oflag, int mode) { 3701 3702 if (strlen(path) > MAX_PATH - 1) { 3703 errno = ENAMETOOLONG; 3704 return -1; 3705 } 3706 int fd; 3707 3708 fd = ::open64(path, oflag, mode); 3709 if (fd == -1) return -1; 3710 3711 // If the open succeeded, the file might still be a directory. 3712 { 3713 struct stat64 buf64; 3714 int ret = ::fstat64(fd, &buf64); 3715 int st_mode = buf64.st_mode; 3716 3717 if (ret != -1) { 3718 if ((st_mode & S_IFMT) == S_IFDIR) { 3719 errno = EISDIR; 3720 ::close(fd); 3721 return -1; 3722 } 3723 } else { 3724 ::close(fd); 3725 return -1; 3726 } 3727 } 3728 3729 // All file descriptors that are opened in the JVM and not 3730 // specifically destined for a subprocess should have the 3731 // close-on-exec flag set. If we don't set it, then careless 3rd 3732 // party native code might fork and exec without closing all 3733 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3734 // UNIXProcess.c), and this in turn might: 3735 // 3736 // - cause end-of-file to fail to be detected on some file 3737 // descriptors, resulting in mysterious hangs, or 3738 // 3739 // - might cause an fopen in the subprocess to fail on a system 3740 // suffering from bug 1085341. 3741 // 3742 // (Yes, the default setting of the close-on-exec flag is a Unix 3743 // design flaw.) 3744 // 3745 // See: 3746 // 1085341: 32-bit stdio routines should support file descriptors >255 3747 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3748 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3749 #ifdef FD_CLOEXEC 3750 { 3751 int flags = ::fcntl(fd, F_GETFD); 3752 if (flags != -1) 3753 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3754 } 3755 #endif 3756 3757 return fd; 3758 } 3759 3760 // create binary file, rewriting existing file if required 3761 int os::create_binary_file(const char* path, bool rewrite_existing) { 3762 int oflags = O_WRONLY | O_CREAT; 3763 if (!rewrite_existing) { 3764 oflags |= O_EXCL; 3765 } 3766 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3767 } 3768 3769 // return current position of file pointer 3770 jlong os::current_file_offset(int fd) { 3771 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3772 } 3773 3774 // move file pointer to the specified offset 3775 jlong os::seek_to_file_offset(int fd, jlong offset) { 3776 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3777 } 3778 3779 // This code originates from JDK's sysAvailable 3780 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3781 3782 int os::available(int fd, jlong *bytes) { 3783 jlong cur, end; 3784 int mode; 3785 struct stat64 buf64; 3786 3787 if (::fstat64(fd, &buf64) >= 0) { 3788 mode = buf64.st_mode; 3789 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3790 int n; 3791 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3792 *bytes = n; 3793 return 1; 3794 } 3795 } 3796 } 3797 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3798 return 0; 3799 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3800 return 0; 3801 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3802 return 0; 3803 } 3804 *bytes = end - cur; 3805 return 1; 3806 } 3807 3808 // Map a block of memory. 3809 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3810 char *addr, size_t bytes, bool read_only, 3811 bool allow_exec) { 3812 int prot; 3813 int flags = MAP_PRIVATE; 3814 3815 if (read_only) { 3816 prot = PROT_READ; 3817 flags = MAP_SHARED; 3818 } else { 3819 prot = PROT_READ | PROT_WRITE; 3820 flags = MAP_PRIVATE; 3821 } 3822 3823 if (allow_exec) { 3824 prot |= PROT_EXEC; 3825 } 3826 3827 if (addr != NULL) { 3828 flags |= MAP_FIXED; 3829 } 3830 3831 // Allow anonymous mappings if 'fd' is -1. 3832 if (fd == -1) { 3833 flags |= MAP_ANONYMOUS; 3834 } 3835 3836 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3837 fd, file_offset); 3838 if (mapped_address == MAP_FAILED) { 3839 return NULL; 3840 } 3841 return mapped_address; 3842 } 3843 3844 // Remap a block of memory. 3845 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3846 char *addr, size_t bytes, bool read_only, 3847 bool allow_exec) { 3848 // same as map_memory() on this OS 3849 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3850 allow_exec); 3851 } 3852 3853 // Unmap a block of memory. 3854 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3855 return munmap(addr, bytes) == 0; 3856 } 3857 3858 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3859 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3860 // of a thread. 3861 // 3862 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3863 // the fast estimate available on the platform. 3864 3865 jlong os::current_thread_cpu_time() { 3866 // return user + sys since the cost is the same 3867 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3868 assert(n >= 0, "negative CPU time"); 3869 return n; 3870 } 3871 3872 jlong os::thread_cpu_time(Thread* thread) { 3873 // consistent with what current_thread_cpu_time() returns 3874 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3875 assert(n >= 0, "negative CPU time"); 3876 return n; 3877 } 3878 3879 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3880 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3881 assert(n >= 0, "negative CPU time"); 3882 return n; 3883 } 3884 3885 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3886 bool error = false; 3887 3888 jlong sys_time = 0; 3889 jlong user_time = 0; 3890 3891 // Reimplemented using getthrds64(). 3892 // 3893 // Works like this: 3894 // For the thread in question, get the kernel thread id. Then get the 3895 // kernel thread statistics using that id. 3896 // 3897 // This only works of course when no pthread scheduling is used, 3898 // i.e. there is a 1:1 relationship to kernel threads. 3899 // On AIX, see AIXTHREAD_SCOPE variable. 3900 3901 pthread_t pthtid = thread->osthread()->pthread_id(); 3902 3903 // retrieve kernel thread id for the pthread: 3904 tid64_t tid = 0; 3905 struct __pthrdsinfo pinfo; 3906 // I just love those otherworldly IBM APIs which force me to hand down 3907 // dummy buffers for stuff I dont care for... 3908 char dummy[1]; 3909 int dummy_size = sizeof(dummy); 3910 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3911 dummy, &dummy_size) == 0) { 3912 tid = pinfo.__pi_tid; 3913 } else { 3914 tty->print_cr("pthread_getthrds_np failed."); 3915 error = true; 3916 } 3917 3918 // retrieve kernel timing info for that kernel thread 3919 if (!error) { 3920 struct thrdentry64 thrdentry; 3921 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 3922 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 3923 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 3924 } else { 3925 tty->print_cr("pthread_getthrds_np failed."); 3926 error = true; 3927 } 3928 } 3929 3930 if (p_sys_time) { 3931 *p_sys_time = sys_time; 3932 } 3933 3934 if (p_user_time) { 3935 *p_user_time = user_time; 3936 } 3937 3938 if (error) { 3939 return false; 3940 } 3941 3942 return true; 3943 } 3944 3945 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3946 jlong sys_time; 3947 jlong user_time; 3948 3949 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 3950 return -1; 3951 } 3952 3953 return user_sys_cpu_time ? sys_time + user_time : user_time; 3954 } 3955 3956 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3957 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3958 info_ptr->may_skip_backward = false; // elapsed time not wall time 3959 info_ptr->may_skip_forward = false; // elapsed time not wall time 3960 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3961 } 3962 3963 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3964 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3965 info_ptr->may_skip_backward = false; // elapsed time not wall time 3966 info_ptr->may_skip_forward = false; // elapsed time not wall time 3967 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3968 } 3969 3970 bool os::is_thread_cpu_time_supported() { 3971 return true; 3972 } 3973 3974 // System loadavg support. Returns -1 if load average cannot be obtained. 3975 // For now just return the system wide load average (no processor sets). 3976 int os::loadavg(double values[], int nelem) { 3977 3978 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 3979 guarantee(values, "argument error"); 3980 3981 if (os::Aix::on_pase()) { 3982 3983 // AS/400 PASE: use libo4 porting library 3984 double v[3] = { 0.0, 0.0, 0.0 }; 3985 3986 if (libo4::get_load_avg(v, v + 1, v + 2)) { 3987 for (int i = 0; i < nelem; i ++) { 3988 values[i] = v[i]; 3989 } 3990 return nelem; 3991 } else { 3992 return -1; 3993 } 3994 3995 } else { 3996 3997 // AIX: use libperfstat 3998 libperfstat::cpuinfo_t ci; 3999 if (libperfstat::get_cpuinfo(&ci)) { 4000 for (int i = 0; i < nelem; i++) { 4001 values[i] = ci.loadavg[i]; 4002 } 4003 } else { 4004 return -1; 4005 } 4006 return nelem; 4007 } 4008 } 4009 4010 void os::pause() { 4011 char filename[MAX_PATH]; 4012 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4013 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4014 } else { 4015 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4016 } 4017 4018 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4019 if (fd != -1) { 4020 struct stat buf; 4021 ::close(fd); 4022 while (::stat(filename, &buf) == 0) { 4023 (void)::poll(NULL, 0, 100); 4024 } 4025 } else { 4026 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4027 } 4028 } 4029 4030 bool os::is_primordial_thread(void) { 4031 if (pthread_self() == (pthread_t)1) { 4032 return true; 4033 } else { 4034 return false; 4035 } 4036 } 4037 4038 // OS recognitions (PASE/AIX, OS level) call this before calling any 4039 // one of Aix::on_pase(), Aix::os_version() static 4040 void os::Aix::initialize_os_info() { 4041 4042 assert(_on_pase == -1 && _os_version == 0, "already called."); 4043 4044 struct utsname uts; 4045 memset(&uts, 0, sizeof(uts)); 4046 strcpy(uts.sysname, "?"); 4047 if (::uname(&uts) == -1) { 4048 trcVerbose("uname failed (%d)", errno); 4049 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4050 } else { 4051 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4052 "node \"%s\" machine \"%s\"\n", 4053 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4054 const int major = atoi(uts.version); 4055 assert(major > 0, "invalid OS version"); 4056 const int minor = atoi(uts.release); 4057 assert(minor > 0, "invalid OS release"); 4058 _os_version = (major << 24) | (minor << 16); 4059 char ver_str[20] = {0}; 4060 const char* name_str = "unknown OS"; 4061 if (strcmp(uts.sysname, "OS400") == 0) { 4062 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4063 _on_pase = 1; 4064 if (os_version_short() < 0x0504) { 4065 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4066 assert(false, "OS/400 release too old."); 4067 } 4068 name_str = "OS/400 (pase)"; 4069 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4070 } else if (strcmp(uts.sysname, "AIX") == 0) { 4071 // We run on AIX. We do not support versions older than AIX 7.1. 4072 _on_pase = 0; 4073 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4074 odmWrapper::determine_os_kernel_version(&_os_version); 4075 if (os_version_short() < 0x0701) { 4076 trcVerbose("AIX releases older than AIX 7.1 are not supported."); 4077 assert(false, "AIX release too old."); 4078 } 4079 name_str = "AIX"; 4080 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4081 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4082 } else { 4083 assert(false, "%s", name_str); 4084 } 4085 trcVerbose("We run on %s %s", name_str, ver_str); 4086 } 4087 4088 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4089 } // end: os::Aix::initialize_os_info() 4090 4091 // Scan environment for important settings which might effect the VM. 4092 // Trace out settings. Warn about invalid settings and/or correct them. 4093 // 4094 // Must run after os::Aix::initialue_os_info(). 4095 void os::Aix::scan_environment() { 4096 4097 char* p; 4098 int rc; 4099 4100 // Warn explicity if EXTSHM=ON is used. That switch changes how 4101 // System V shared memory behaves. One effect is that page size of 4102 // shared memory cannot be change dynamically, effectivly preventing 4103 // large pages from working. 4104 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4105 // recommendation is (in OSS notes) to switch it off. 4106 p = ::getenv("EXTSHM"); 4107 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4108 if (p && strcasecmp(p, "ON") == 0) { 4109 _extshm = 1; 4110 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4111 if (!AllowExtshm) { 4112 // We allow under certain conditions the user to continue. However, we want this 4113 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4114 // that the VM is not able to allocate 64k pages for the heap. 4115 // We do not want to run with reduced performance. 4116 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4117 } 4118 } else { 4119 _extshm = 0; 4120 } 4121 4122 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4123 // Not tested, not supported. 4124 // 4125 // Note that it might be worth the trouble to test and to require it, if only to 4126 // get useful return codes for mprotect. 4127 // 4128 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4129 // exec() ? before loading the libjvm ? ....) 4130 p = ::getenv("XPG_SUS_ENV"); 4131 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4132 if (p && strcmp(p, "ON") == 0) { 4133 _xpg_sus_mode = 1; 4134 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4135 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4136 // clobber address ranges. If we ever want to support that, we have to do some 4137 // testing first. 4138 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4139 } else { 4140 _xpg_sus_mode = 0; 4141 } 4142 4143 if (os::Aix::on_pase()) { 4144 p = ::getenv("QIBM_MULTI_THREADED"); 4145 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4146 } 4147 4148 p = ::getenv("LDR_CNTRL"); 4149 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4150 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4151 if (p && ::strstr(p, "TEXTPSIZE")) { 4152 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4153 "you may experience hangs or crashes on OS/400 V7R1."); 4154 } 4155 } 4156 4157 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4158 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4159 4160 } // end: os::Aix::scan_environment() 4161 4162 // PASE: initialize the libo4 library (PASE porting library). 4163 void os::Aix::initialize_libo4() { 4164 guarantee(os::Aix::on_pase(), "OS/400 only."); 4165 if (!libo4::init()) { 4166 trcVerbose("libo4 initialization failed."); 4167 assert(false, "libo4 initialization failed"); 4168 } else { 4169 trcVerbose("libo4 initialized."); 4170 } 4171 } 4172 4173 // AIX: initialize the libperfstat library. 4174 void os::Aix::initialize_libperfstat() { 4175 assert(os::Aix::on_aix(), "AIX only"); 4176 if (!libperfstat::init()) { 4177 trcVerbose("libperfstat initialization failed."); 4178 assert(false, "libperfstat initialization failed"); 4179 } else { 4180 trcVerbose("libperfstat initialized."); 4181 } 4182 } 4183 4184 ///////////////////////////////////////////////////////////////////////////// 4185 // thread stack 4186 4187 // Get the current stack base from the OS (actually, the pthread library). 4188 // Note: usually not page aligned. 4189 address os::current_stack_base() { 4190 AixMisc::stackbounds_t bounds; 4191 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4192 guarantee(rc, "Unable to retrieve stack bounds."); 4193 return bounds.base; 4194 } 4195 4196 // Get the current stack size from the OS (actually, the pthread library). 4197 // Returned size is such that (base - size) is always aligned to page size. 4198 size_t os::current_stack_size() { 4199 AixMisc::stackbounds_t bounds; 4200 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4201 guarantee(rc, "Unable to retrieve stack bounds."); 4202 // Align the returned stack size such that the stack low address 4203 // is aligned to page size (Note: base is usually not and we do not care). 4204 // We need to do this because caller code will assume stack low address is 4205 // page aligned and will place guard pages without checking. 4206 address low = bounds.base - bounds.size; 4207 address low_aligned = (address)align_up(low, os::vm_page_size()); 4208 size_t s = bounds.base - low_aligned; 4209 return s; 4210 } 4211 4212 extern char** environ; 4213 4214 // Run the specified command in a separate process. Return its exit value, 4215 // or -1 on failure (e.g. can't fork a new process). 4216 // Unlike system(), this function can be called from signal handler. It 4217 // doesn't block SIGINT et al. 4218 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 4219 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL}; 4220 4221 pid_t pid = fork(); 4222 4223 if (pid < 0) { 4224 // fork failed 4225 return -1; 4226 4227 } else if (pid == 0) { 4228 // child process 4229 4230 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4231 execve("/usr/bin/sh", argv, environ); 4232 4233 // execve failed 4234 _exit(-1); 4235 4236 } else { 4237 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4238 // care about the actual exit code, for now. 4239 4240 int status; 4241 4242 // Wait for the child process to exit. This returns immediately if 4243 // the child has already exited. */ 4244 while (waitpid(pid, &status, 0) < 0) { 4245 switch (errno) { 4246 case ECHILD: return 0; 4247 case EINTR: break; 4248 default: return -1; 4249 } 4250 } 4251 4252 if (WIFEXITED(status)) { 4253 // The child exited normally; get its exit code. 4254 return WEXITSTATUS(status); 4255 } else if (WIFSIGNALED(status)) { 4256 // The child exited because of a signal. 4257 // The best value to return is 0x80 + signal number, 4258 // because that is what all Unix shells do, and because 4259 // it allows callers to distinguish between process exit and 4260 // process death by signal. 4261 return 0x80 + WTERMSIG(status); 4262 } else { 4263 // Unknown exit code; pass it through. 4264 return status; 4265 } 4266 } 4267 return -1; 4268 } 4269 4270 // Get the default path to the core file 4271 // Returns the length of the string 4272 int os::get_core_path(char* buffer, size_t bufferSize) { 4273 const char* p = get_current_directory(buffer, bufferSize); 4274 4275 if (p == NULL) { 4276 assert(p != NULL, "failed to get current directory"); 4277 return 0; 4278 } 4279 4280 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4281 p, current_process_id()); 4282 4283 return strlen(buffer); 4284 } 4285 4286 #ifndef PRODUCT 4287 void TestReserveMemorySpecial_test() { 4288 // No tests available for this platform 4289 } 4290 #endif 4291 4292 bool os::start_debugging(char *buf, int buflen) { 4293 int len = (int)strlen(buf); 4294 char *p = &buf[len]; 4295 4296 jio_snprintf(p, buflen -len, 4297 "\n\n" 4298 "Do you want to debug the problem?\n\n" 4299 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4300 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4301 "Otherwise, press RETURN to abort...", 4302 os::current_process_id(), 4303 os::current_thread_id(), thread_self()); 4304 4305 bool yes = os::message_box("Unexpected Error", buf); 4306 4307 if (yes) { 4308 // yes, user asked VM to launch debugger 4309 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4310 4311 os::fork_and_exec(buf); 4312 yes = false; 4313 } 4314 return yes; 4315 } 4316 4317 static inline time_t get_mtime(const char* filename) { 4318 struct stat st; 4319 int ret = os::stat(filename, &st); 4320 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 4321 return st.st_mtime; 4322 } 4323 4324 int os::compare_file_modified_times(const char* file1, const char* file2) { 4325 time_t t1 = get_mtime(file1); 4326 time_t t2 = get_mtime(file2); 4327 return t1 - t2; 4328 } 4329 4330 bool os::supports_map_sync() { 4331 return false; 4332 }