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 1038 double os::elapsedVTime() { 1039 struct rusage usage; 1040 int retval = getrusage(RUSAGE_THREAD, &usage); 1041 if (retval == 0) { 1042 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1043 } else { 1044 // better than nothing, but not much 1045 return elapsedTime(); 1046 } 1047 } 1048 1049 jlong os::javaTimeMillis() { 1050 timeval time; 1051 int status = gettimeofday(&time, NULL); 1052 assert(status != -1, "aix error at gettimeofday()"); 1053 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1054 } 1055 1056 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1057 timeval time; 1058 int status = gettimeofday(&time, NULL); 1059 assert(status != -1, "aix error at gettimeofday()"); 1060 seconds = jlong(time.tv_sec); 1061 nanos = jlong(time.tv_usec) * 1000; 1062 } 1063 1064 // We use mread_real_time here. 1065 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1066 // it has to be converted to real time. AIX documentations suggests to do 1067 // this unconditionally, so we do it. 1068 // 1069 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1070 // 1071 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1072 // conversion is necessary. However, mread_real_time will not return 1073 // monotonic results but merely matches read_real_time. So we need a tweak 1074 // to ensure monotonic results. 1075 // 1076 // For PASE no public documentation exists, just word by IBM 1077 jlong os::javaTimeNanos() { 1078 timebasestruct_t time; 1079 int rc = mread_real_time(&time, TIMEBASE_SZ); 1080 if (os::Aix::on_pase()) { 1081 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1082 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1083 jlong prev = max_real_time; 1084 if (now <= prev) { 1085 return prev; // same or retrograde time; 1086 } 1087 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev); 1088 assert(obsv >= prev, "invariant"); // Monotonicity 1089 // If the CAS succeeded then we're done and return "now". 1090 // If the CAS failed and the observed value "obsv" is >= now then 1091 // we should return "obsv". If the CAS failed and now > obsv > prv then 1092 // some other thread raced this thread and installed a new value, in which case 1093 // we could either (a) retry the entire operation, (b) retry trying to install now 1094 // or (c) just return obsv. We use (c). No loop is required although in some cases 1095 // we might discard a higher "now" value in deference to a slightly lower but freshly 1096 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1097 // to (a) or (b) -- and greatly reduces coherence traffic. 1098 // We might also condition (c) on the magnitude of the delta between obsv and now. 1099 // Avoiding excessive CAS operations to hot RW locations is critical. 1100 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1101 return (prev == obsv) ? now : obsv; 1102 } else { 1103 if (rc != RTC_POWER) { 1104 rc = time_base_to_time(&time, TIMEBASE_SZ); 1105 assert(rc != -1, "error calling time_base_to_time()"); 1106 } 1107 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1108 } 1109 } 1110 1111 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1112 info_ptr->max_value = ALL_64_BITS; 1113 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1114 info_ptr->may_skip_backward = false; 1115 info_ptr->may_skip_forward = false; 1116 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1117 } 1118 1119 // Return the real, user, and system times in seconds from an 1120 // arbitrary fixed point in the past. 1121 bool os::getTimesSecs(double* process_real_time, 1122 double* process_user_time, 1123 double* process_system_time) { 1124 struct tms ticks; 1125 clock_t real_ticks = times(&ticks); 1126 1127 if (real_ticks == (clock_t) (-1)) { 1128 return false; 1129 } else { 1130 double ticks_per_second = (double) clock_tics_per_sec; 1131 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1132 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1133 *process_real_time = ((double) real_ticks) / ticks_per_second; 1134 1135 return true; 1136 } 1137 } 1138 1139 char * os::local_time_string(char *buf, size_t buflen) { 1140 struct tm t; 1141 time_t long_time; 1142 time(&long_time); 1143 localtime_r(&long_time, &t); 1144 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1145 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1146 t.tm_hour, t.tm_min, t.tm_sec); 1147 return buf; 1148 } 1149 1150 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1151 return localtime_r(clock, res); 1152 } 1153 1154 //////////////////////////////////////////////////////////////////////////////// 1155 // runtime exit support 1156 1157 // Note: os::shutdown() might be called very early during initialization, or 1158 // called from signal handler. Before adding something to os::shutdown(), make 1159 // sure it is async-safe and can handle partially initialized VM. 1160 void os::shutdown() { 1161 1162 // allow PerfMemory to attempt cleanup of any persistent resources 1163 perfMemory_exit(); 1164 1165 // needs to remove object in file system 1166 AttachListener::abort(); 1167 1168 // flush buffered output, finish log files 1169 ostream_abort(); 1170 1171 // Check for abort hook 1172 abort_hook_t abort_hook = Arguments::abort_hook(); 1173 if (abort_hook != NULL) { 1174 abort_hook(); 1175 } 1176 } 1177 1178 // Note: os::abort() might be called very early during initialization, or 1179 // called from signal handler. Before adding something to os::abort(), make 1180 // sure it is async-safe and can handle partially initialized VM. 1181 void os::abort(bool dump_core, void* siginfo, const void* context) { 1182 os::shutdown(); 1183 if (dump_core) { 1184 #ifndef PRODUCT 1185 fdStream out(defaultStream::output_fd()); 1186 out.print_raw("Current thread is "); 1187 char buf[16]; 1188 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1189 out.print_raw_cr(buf); 1190 out.print_raw_cr("Dumping core ..."); 1191 #endif 1192 ::abort(); // dump core 1193 } 1194 1195 ::exit(1); 1196 } 1197 1198 // Die immediately, no exit hook, no abort hook, no cleanup. 1199 // Dump a core file, if possible, for debugging. 1200 void os::die() { 1201 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1202 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1203 // and don't take the time to generate a core file. 1204 os::signal_raise(SIGKILL); 1205 } else { 1206 ::abort(); 1207 } 1208 } 1209 1210 intx os::current_thread_id() { 1211 return (intx)pthread_self(); 1212 } 1213 1214 int os::current_process_id() { 1215 return getpid(); 1216 } 1217 1218 // DLL functions 1219 1220 const char* os::dll_file_extension() { return ".so"; } 1221 1222 // This must be hard coded because it's the system's temporary 1223 // directory not the java application's temp directory, ala java.io.tmpdir. 1224 const char* os::get_temp_directory() { return "/tmp"; } 1225 1226 // Check if addr is inside libjvm.so. 1227 bool os::address_is_in_vm(address addr) { 1228 1229 // Input could be a real pc or a function pointer literal. The latter 1230 // would be a function descriptor residing in the data segment of a module. 1231 loaded_module_t lm; 1232 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1233 return lm.is_in_vm; 1234 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1235 return lm.is_in_vm; 1236 } else { 1237 return false; 1238 } 1239 1240 } 1241 1242 // Resolve an AIX function descriptor literal to a code pointer. 1243 // If the input is a valid code pointer to a text segment of a loaded module, 1244 // it is returned unchanged. 1245 // If the input is a valid AIX function descriptor, it is resolved to the 1246 // code entry point. 1247 // If the input is neither a valid function descriptor nor a valid code pointer, 1248 // NULL is returned. 1249 static address resolve_function_descriptor_to_code_pointer(address p) { 1250 1251 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1252 // It is a real code pointer. 1253 return p; 1254 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1255 // Pointer to data segment, potential function descriptor. 1256 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1257 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1258 // It is a function descriptor. 1259 return code_entry; 1260 } 1261 } 1262 1263 return NULL; 1264 } 1265 1266 bool os::dll_address_to_function_name(address addr, char *buf, 1267 int buflen, int *offset, 1268 bool demangle) { 1269 if (offset) { 1270 *offset = -1; 1271 } 1272 // Buf is not optional, but offset is optional. 1273 assert(buf != NULL, "sanity check"); 1274 buf[0] = '\0'; 1275 1276 // Resolve function ptr literals first. 1277 addr = resolve_function_descriptor_to_code_pointer(addr); 1278 if (!addr) { 1279 return false; 1280 } 1281 1282 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1283 } 1284 1285 bool os::dll_address_to_library_name(address addr, char* buf, 1286 int buflen, int* offset) { 1287 if (offset) { 1288 *offset = -1; 1289 } 1290 // Buf is not optional, but offset is optional. 1291 assert(buf != NULL, "sanity check"); 1292 buf[0] = '\0'; 1293 1294 // Resolve function ptr literals first. 1295 addr = resolve_function_descriptor_to_code_pointer(addr); 1296 if (!addr) { 1297 return false; 1298 } 1299 1300 return AixSymbols::get_module_name(addr, buf, buflen); 1301 } 1302 1303 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1304 // for the same architecture as Hotspot is running on. 1305 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1306 1307 log_info(os)("attempting shared library load of %s", filename); 1308 1309 if (ebuf && ebuflen > 0) { 1310 ebuf[0] = '\0'; 1311 ebuf[ebuflen - 1] = '\0'; 1312 } 1313 1314 if (!filename || strlen(filename) == 0) { 1315 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1316 return NULL; 1317 } 1318 1319 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1320 void * result= ::dlopen(filename, RTLD_LAZY); 1321 if (result != NULL) { 1322 Events::log(NULL, "Loaded shared library %s", filename); 1323 // Reload dll cache. Don't do this in signal handling. 1324 LoadedLibraries::reload(); 1325 log_info(os)("shared library load of %s was successful", filename); 1326 return result; 1327 } else { 1328 // error analysis when dlopen fails 1329 const char* error_report = ::dlerror(); 1330 if (error_report == NULL) { 1331 error_report = "dlerror returned no error description"; 1332 } 1333 if (ebuf != NULL && ebuflen > 0) { 1334 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1335 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1336 } 1337 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1338 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1339 } 1340 return NULL; 1341 } 1342 1343 void* os::dll_lookup(void* handle, const char* name) { 1344 void* res = dlsym(handle, name); 1345 return res; 1346 } 1347 1348 void* os::get_default_process_handle() { 1349 return (void*)::dlopen(NULL, RTLD_LAZY); 1350 } 1351 1352 void os::print_dll_info(outputStream *st) { 1353 st->print_cr("Dynamic libraries:"); 1354 LoadedLibraries::print(st); 1355 } 1356 1357 void os::get_summary_os_info(char* buf, size_t buflen) { 1358 // There might be something more readable than uname results for AIX. 1359 struct utsname name; 1360 uname(&name); 1361 snprintf(buf, buflen, "%s %s", name.release, name.version); 1362 } 1363 1364 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1365 // Not yet implemented. 1366 return 0; 1367 } 1368 1369 void os::print_os_info_brief(outputStream* st) { 1370 uint32_t ver = os::Aix::os_version(); 1371 st->print_cr("AIX kernel version %u.%u.%u.%u", 1372 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1373 1374 os::Posix::print_uname_info(st); 1375 1376 // Linux uses print_libversion_info(st); here. 1377 } 1378 1379 void os::print_os_info(outputStream* st) { 1380 st->print("OS:"); 1381 1382 os::Posix::print_uname_info(st); 1383 1384 uint32_t ver = os::Aix::os_version(); 1385 st->print_cr("AIX kernel version %u.%u.%u.%u", 1386 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1387 1388 os::Posix::print_rlimit_info(st); 1389 1390 os::Posix::print_load_average(st); 1391 1392 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process. 1393 long tmax = sysconf(_SC_THREAD_THREADS_MAX); 1394 st->print_cr("maximum #threads within a process:%ld", tmax); 1395 1396 // print wpar info 1397 libperfstat::wparinfo_t wi; 1398 if (libperfstat::get_wparinfo(&wi)) { 1399 st->print_cr("wpar info"); 1400 st->print_cr("name: %s", wi.name); 1401 st->print_cr("id: %d", wi.wpar_id); 1402 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1403 } 1404 1405 VM_Version::print_platform_virtualization_info(st); 1406 } 1407 1408 void os::print_memory_info(outputStream* st) { 1409 1410 st->print_cr("Memory:"); 1411 1412 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1413 describe_pagesize(g_multipage_support.pagesize)); 1414 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1415 describe_pagesize(g_multipage_support.datapsize)); 1416 st->print_cr(" Text page size: %s", 1417 describe_pagesize(g_multipage_support.textpsize)); 1418 st->print_cr(" Thread stack page size (pthread): %s", 1419 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1420 st->print_cr(" Default shared memory page size: %s", 1421 describe_pagesize(g_multipage_support.shmpsize)); 1422 st->print_cr(" Can use 64K pages dynamically with shared memory: %s", 1423 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1424 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1425 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1426 st->print_cr(" Multipage error: %d", 1427 g_multipage_support.error); 1428 st->cr(); 1429 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1430 1431 // print out LDR_CNTRL because it affects the default page sizes 1432 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1433 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1434 1435 // Print out EXTSHM because it is an unsupported setting. 1436 const char* const extshm = ::getenv("EXTSHM"); 1437 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1438 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1439 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1440 } 1441 1442 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1443 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1444 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1445 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1446 st->cr(); 1447 1448 os::Aix::meminfo_t mi; 1449 if (os::Aix::get_meminfo(&mi)) { 1450 if (os::Aix::on_aix()) { 1451 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1452 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1453 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1454 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1455 } else { 1456 // PASE - Numbers are result of QWCRSSTS; they mean: 1457 // real_total: Sum of all system pools 1458 // real_free: always 0 1459 // pgsp_total: we take the size of the system ASP 1460 // pgsp_free: size of system ASP times percentage of system ASP unused 1461 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1462 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1463 st->print_cr("%% system asp used : %.2f", 1464 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1465 } 1466 } 1467 st->cr(); 1468 1469 // Print program break. 1470 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1471 address brk_now = (address)::sbrk(0); 1472 if (brk_now != (address)-1) { 1473 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1474 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1475 } 1476 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1477 st->cr(); 1478 1479 // Print segments allocated with os::reserve_memory. 1480 st->print_cr("internal virtual memory regions used by vm:"); 1481 vmembk_print_on(st); 1482 } 1483 1484 // Get a string for the cpuinfo that is a summary of the cpu type 1485 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1486 // read _system_configuration.version 1487 switch (_system_configuration.version) { 1488 case PV_9: 1489 strncpy(buf, "Power PC 9", buflen); 1490 break; 1491 case PV_8: 1492 strncpy(buf, "Power PC 8", buflen); 1493 break; 1494 case PV_7: 1495 strncpy(buf, "Power PC 7", buflen); 1496 break; 1497 case PV_6_1: 1498 strncpy(buf, "Power PC 6 DD1.x", buflen); 1499 break; 1500 case PV_6: 1501 strncpy(buf, "Power PC 6", buflen); 1502 break; 1503 case PV_5: 1504 strncpy(buf, "Power PC 5", buflen); 1505 break; 1506 case PV_5_2: 1507 strncpy(buf, "Power PC 5_2", buflen); 1508 break; 1509 case PV_5_3: 1510 strncpy(buf, "Power PC 5_3", buflen); 1511 break; 1512 case PV_5_Compat: 1513 strncpy(buf, "PV_5_Compat", buflen); 1514 break; 1515 case PV_6_Compat: 1516 strncpy(buf, "PV_6_Compat", buflen); 1517 break; 1518 case PV_7_Compat: 1519 strncpy(buf, "PV_7_Compat", buflen); 1520 break; 1521 case PV_8_Compat: 1522 strncpy(buf, "PV_8_Compat", buflen); 1523 break; 1524 case PV_9_Compat: 1525 strncpy(buf, "PV_9_Compat", buflen); 1526 break; 1527 default: 1528 strncpy(buf, "unknown", buflen); 1529 } 1530 } 1531 1532 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1533 // Nothing to do beyond of what os::print_cpu_info() does. 1534 } 1535 1536 static void print_signal_handler(outputStream* st, int sig, 1537 char* buf, size_t buflen); 1538 1539 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1540 st->print_cr("Signal Handlers:"); 1541 print_signal_handler(st, SIGSEGV, buf, buflen); 1542 print_signal_handler(st, SIGBUS , buf, buflen); 1543 print_signal_handler(st, SIGFPE , buf, buflen); 1544 print_signal_handler(st, SIGPIPE, buf, buflen); 1545 print_signal_handler(st, SIGXFSZ, buf, buflen); 1546 print_signal_handler(st, SIGILL , buf, buflen); 1547 print_signal_handler(st, SR_signum, buf, buflen); 1548 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1549 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1550 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1551 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1552 print_signal_handler(st, SIGTRAP, buf, buflen); 1553 // We also want to know if someone else adds a SIGDANGER handler because 1554 // that will interfere with OOM killling. 1555 print_signal_handler(st, SIGDANGER, buf, buflen); 1556 } 1557 1558 static char saved_jvm_path[MAXPATHLEN] = {0}; 1559 1560 // Find the full path to the current module, libjvm.so. 1561 void os::jvm_path(char *buf, jint buflen) { 1562 // Error checking. 1563 if (buflen < MAXPATHLEN) { 1564 assert(false, "must use a large-enough buffer"); 1565 buf[0] = '\0'; 1566 return; 1567 } 1568 // Lazy resolve the path to current module. 1569 if (saved_jvm_path[0] != 0) { 1570 strcpy(buf, saved_jvm_path); 1571 return; 1572 } 1573 1574 Dl_info dlinfo; 1575 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1576 assert(ret != 0, "cannot locate libjvm"); 1577 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1578 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1579 1580 if (Arguments::sun_java_launcher_is_altjvm()) { 1581 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1582 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1583 // If "/jre/lib/" appears at the right place in the string, then 1584 // assume we are installed in a JDK and we're done. Otherwise, check 1585 // for a JAVA_HOME environment variable and fix up the path so it 1586 // looks like libjvm.so is installed there (append a fake suffix 1587 // hotspot/libjvm.so). 1588 const char *p = buf + strlen(buf) - 1; 1589 for (int count = 0; p > buf && count < 4; ++count) { 1590 for (--p; p > buf && *p != '/'; --p) 1591 /* empty */ ; 1592 } 1593 1594 if (strncmp(p, "/jre/lib/", 9) != 0) { 1595 // Look for JAVA_HOME in the environment. 1596 char* java_home_var = ::getenv("JAVA_HOME"); 1597 if (java_home_var != NULL && java_home_var[0] != 0) { 1598 char* jrelib_p; 1599 int len; 1600 1601 // Check the current module name "libjvm.so". 1602 p = strrchr(buf, '/'); 1603 if (p == NULL) { 1604 return; 1605 } 1606 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1607 1608 rp = os::Posix::realpath(java_home_var, buf, buflen); 1609 if (rp == NULL) { 1610 return; 1611 } 1612 1613 // determine if this is a legacy image or modules image 1614 // modules image doesn't have "jre" subdirectory 1615 len = strlen(buf); 1616 assert(len < buflen, "Ran out of buffer room"); 1617 jrelib_p = buf + len; 1618 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1619 if (0 != access(buf, F_OK)) { 1620 snprintf(jrelib_p, buflen-len, "/lib"); 1621 } 1622 1623 if (0 == access(buf, F_OK)) { 1624 // Use current module name "libjvm.so" 1625 len = strlen(buf); 1626 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1627 } else { 1628 // Go back to path of .so 1629 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1630 if (rp == NULL) { 1631 return; 1632 } 1633 } 1634 } 1635 } 1636 } 1637 1638 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1639 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1640 } 1641 1642 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1643 // no prefix required, not even "_" 1644 } 1645 1646 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1647 // no suffix required 1648 } 1649 1650 //////////////////////////////////////////////////////////////////////////////// 1651 // sun.misc.Signal support 1652 1653 static void 1654 UserHandler(int sig, void *siginfo, void *context) { 1655 // Ctrl-C is pressed during error reporting, likely because the error 1656 // handler fails to abort. Let VM die immediately. 1657 if (sig == SIGINT && VMError::is_error_reported()) { 1658 os::die(); 1659 } 1660 1661 os::signal_notify(sig); 1662 } 1663 1664 void* os::user_handler() { 1665 return CAST_FROM_FN_PTR(void*, UserHandler); 1666 } 1667 1668 extern "C" { 1669 typedef void (*sa_handler_t)(int); 1670 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1671 } 1672 1673 void* os::signal(int signal_number, void* handler) { 1674 struct sigaction sigAct, oldSigAct; 1675 1676 sigfillset(&(sigAct.sa_mask)); 1677 1678 // Do not block out synchronous signals in the signal handler. 1679 // Blocking synchronous signals only makes sense if you can really 1680 // be sure that those signals won't happen during signal handling, 1681 // when the blocking applies. Normal signal handlers are lean and 1682 // do not cause signals. But our signal handlers tend to be "risky" 1683 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1684 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1685 // by a SIGILL, which was blocked due to the signal mask. The process 1686 // just hung forever. Better to crash from a secondary signal than to hang. 1687 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1688 sigdelset(&(sigAct.sa_mask), SIGBUS); 1689 sigdelset(&(sigAct.sa_mask), SIGILL); 1690 sigdelset(&(sigAct.sa_mask), SIGFPE); 1691 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1692 1693 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1694 1695 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1696 1697 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1698 // -1 means registration failed 1699 return (void *)-1; 1700 } 1701 1702 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1703 } 1704 1705 void os::signal_raise(int signal_number) { 1706 ::raise(signal_number); 1707 } 1708 1709 // 1710 // The following code is moved from os.cpp for making this 1711 // code platform specific, which it is by its very nature. 1712 // 1713 1714 // Will be modified when max signal is changed to be dynamic 1715 int os::sigexitnum_pd() { 1716 return NSIG; 1717 } 1718 1719 // a counter for each possible signal value 1720 static volatile jint pending_signals[NSIG+1] = { 0 }; 1721 1722 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1723 // On AIX, we use sem_init(), sem_post(), sem_wait() 1724 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1725 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1726 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1727 // on AIX, msem_..() calls are suspected of causing problems. 1728 static sem_t sig_sem; 1729 static msemaphore* p_sig_msem = 0; 1730 1731 static void local_sem_init() { 1732 if (os::Aix::on_aix()) { 1733 int rc = ::sem_init(&sig_sem, 0, 0); 1734 guarantee(rc != -1, "sem_init failed"); 1735 } else { 1736 // Memory semaphores must live in shared mem. 1737 guarantee0(p_sig_msem == NULL); 1738 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1739 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1740 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1741 } 1742 } 1743 1744 static void local_sem_post() { 1745 static bool warn_only_once = false; 1746 if (os::Aix::on_aix()) { 1747 int rc = ::sem_post(&sig_sem); 1748 if (rc == -1 && !warn_only_once) { 1749 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1750 warn_only_once = true; 1751 } 1752 } else { 1753 guarantee0(p_sig_msem != NULL); 1754 int rc = ::msem_unlock(p_sig_msem, 0); 1755 if (rc == -1 && !warn_only_once) { 1756 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1757 warn_only_once = true; 1758 } 1759 } 1760 } 1761 1762 static void local_sem_wait() { 1763 static bool warn_only_once = false; 1764 if (os::Aix::on_aix()) { 1765 int rc = ::sem_wait(&sig_sem); 1766 if (rc == -1 && !warn_only_once) { 1767 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1768 warn_only_once = true; 1769 } 1770 } else { 1771 guarantee0(p_sig_msem != NULL); // must init before use 1772 int rc = ::msem_lock(p_sig_msem, 0); 1773 if (rc == -1 && !warn_only_once) { 1774 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1775 warn_only_once = true; 1776 } 1777 } 1778 } 1779 1780 static void jdk_misc_signal_init() { 1781 // Initialize signal structures 1782 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1783 1784 // Initialize signal semaphore 1785 local_sem_init(); 1786 } 1787 1788 void os::signal_notify(int sig) { 1789 Atomic::inc(&pending_signals[sig]); 1790 local_sem_post(); 1791 } 1792 1793 static int check_pending_signals() { 1794 for (;;) { 1795 for (int i = 0; i < NSIG + 1; i++) { 1796 jint n = pending_signals[i]; 1797 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1798 return i; 1799 } 1800 } 1801 JavaThread *thread = JavaThread::current(); 1802 ThreadBlockInVM tbivm(thread); 1803 1804 bool threadIsSuspended; 1805 do { 1806 thread->set_suspend_equivalent(); 1807 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1808 1809 local_sem_wait(); 1810 1811 // were we externally suspended while we were waiting? 1812 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1813 if (threadIsSuspended) { 1814 // 1815 // The semaphore has been incremented, but while we were waiting 1816 // another thread suspended us. We don't want to continue running 1817 // while suspended because that would surprise the thread that 1818 // suspended us. 1819 // 1820 1821 local_sem_post(); 1822 1823 thread->java_suspend_self(); 1824 } 1825 } while (threadIsSuspended); 1826 } 1827 } 1828 1829 int os::signal_wait() { 1830 return check_pending_signals(); 1831 } 1832 1833 //////////////////////////////////////////////////////////////////////////////// 1834 // Virtual Memory 1835 1836 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1837 1838 #define VMEM_MAPPED 1 1839 #define VMEM_SHMATED 2 1840 1841 struct vmembk_t { 1842 int type; // 1 - mmap, 2 - shmat 1843 char* addr; 1844 size_t size; // Real size, may be larger than usersize. 1845 size_t pagesize; // page size of area 1846 vmembk_t* next; 1847 1848 bool contains_addr(char* p) const { 1849 return p >= addr && p < (addr + size); 1850 } 1851 1852 bool contains_range(char* p, size_t s) const { 1853 return contains_addr(p) && contains_addr(p + s - 1); 1854 } 1855 1856 void print_on(outputStream* os) const { 1857 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1858 " bytes, %d %s pages), %s", 1859 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1860 (type == VMEM_SHMATED ? "shmat" : "mmap") 1861 ); 1862 } 1863 1864 // Check that range is a sub range of memory block (or equal to memory block); 1865 // also check that range is fully page aligned to the page size if the block. 1866 void assert_is_valid_subrange(char* p, size_t s) const { 1867 if (!contains_range(p, s)) { 1868 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1869 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1870 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size)); 1871 guarantee0(false); 1872 } 1873 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1874 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1875 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize); 1876 guarantee0(false); 1877 } 1878 } 1879 }; 1880 1881 static struct { 1882 vmembk_t* first; 1883 MiscUtils::CritSect cs; 1884 } vmem; 1885 1886 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1887 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1888 assert0(p); 1889 if (p) { 1890 MiscUtils::AutoCritSect lck(&vmem.cs); 1891 p->addr = addr; p->size = size; 1892 p->pagesize = pagesize; 1893 p->type = type; 1894 p->next = vmem.first; 1895 vmem.first = p; 1896 } 1897 } 1898 1899 static vmembk_t* vmembk_find(char* addr) { 1900 MiscUtils::AutoCritSect lck(&vmem.cs); 1901 for (vmembk_t* p = vmem.first; p; p = p->next) { 1902 if (p->addr <= addr && (p->addr + p->size) > addr) { 1903 return p; 1904 } 1905 } 1906 return NULL; 1907 } 1908 1909 static void vmembk_remove(vmembk_t* p0) { 1910 MiscUtils::AutoCritSect lck(&vmem.cs); 1911 assert0(p0); 1912 assert0(vmem.first); // List should not be empty. 1913 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1914 if (*pp == p0) { 1915 *pp = p0->next; 1916 ::free(p0); 1917 return; 1918 } 1919 } 1920 assert0(false); // Not found? 1921 } 1922 1923 static void vmembk_print_on(outputStream* os) { 1924 MiscUtils::AutoCritSect lck(&vmem.cs); 1925 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1926 vmi->print_on(os); 1927 os->cr(); 1928 } 1929 } 1930 1931 // Reserve and attach a section of System V memory. 1932 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1933 // address. Failing that, it will attach the memory anywhere. 1934 // If <requested_addr> is NULL, function will attach the memory anywhere. 1935 // 1936 // <alignment_hint> is being ignored by this function. It is very probable however that the 1937 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1938 // Should this be not enogh, we can put more work into it. 1939 static char* reserve_shmated_memory ( 1940 size_t bytes, 1941 char* requested_addr, 1942 size_t alignment_hint) { 1943 1944 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1945 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1946 bytes, p2i(requested_addr), alignment_hint); 1947 1948 // Either give me wish address or wish alignment but not both. 1949 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1950 1951 // We must prevent anyone from attaching too close to the 1952 // BRK because that may cause malloc OOM. 1953 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1954 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1955 "Will attach anywhere.", p2i(requested_addr)); 1956 // Act like the OS refused to attach there. 1957 requested_addr = NULL; 1958 } 1959 1960 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1961 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1962 if (os::Aix::on_pase_V5R4_or_older()) { 1963 ShouldNotReachHere(); 1964 } 1965 1966 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 1967 const size_t size = align_up(bytes, 64*K); 1968 1969 // Reserve the shared segment. 1970 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 1971 if (shmid == -1) { 1972 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 1973 return NULL; 1974 } 1975 1976 // Important note: 1977 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 1978 // We must right after attaching it remove it from the system. System V shm segments are global and 1979 // survive the process. 1980 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 1981 1982 struct shmid_ds shmbuf; 1983 memset(&shmbuf, 0, sizeof(shmbuf)); 1984 shmbuf.shm_pagesize = 64*K; 1985 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 1986 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 1987 size / (64*K), errno); 1988 // I want to know if this ever happens. 1989 assert(false, "failed to set page size for shmat"); 1990 } 1991 1992 // Now attach the shared segment. 1993 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 1994 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 1995 // were not a segment boundary. 1996 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 1997 const int errno_shmat = errno; 1998 1999 // (A) Right after shmat and before handing shmat errors delete the shm segment. 2000 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 2001 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 2002 assert(false, "failed to remove shared memory segment!"); 2003 } 2004 2005 // Handle shmat error. If we failed to attach, just return. 2006 if (addr == (char*)-1) { 2007 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat); 2008 return NULL; 2009 } 2010 2011 // Just for info: query the real page size. In case setting the page size did not 2012 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2013 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2014 if (real_pagesize != shmbuf.shm_pagesize) { 2015 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize); 2016 } 2017 2018 if (addr) { 2019 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2020 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize)); 2021 } else { 2022 if (requested_addr != NULL) { 2023 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr)); 2024 } else { 2025 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2026 } 2027 } 2028 2029 // book-keeping 2030 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2031 assert0(is_aligned_to(addr, os::vm_page_size())); 2032 2033 return addr; 2034 } 2035 2036 static bool release_shmated_memory(char* addr, size_t size) { 2037 2038 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2039 p2i(addr), p2i(addr + size - 1)); 2040 2041 bool rc = false; 2042 2043 // TODO: is there a way to verify shm size without doing bookkeeping? 2044 if (::shmdt(addr) != 0) { 2045 trcVerbose("error (%d).", errno); 2046 } else { 2047 trcVerbose("ok."); 2048 rc = true; 2049 } 2050 return rc; 2051 } 2052 2053 static bool uncommit_shmated_memory(char* addr, size_t size) { 2054 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2055 p2i(addr), p2i(addr + size - 1)); 2056 2057 const bool rc = my_disclaim64(addr, size); 2058 2059 if (!rc) { 2060 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size); 2061 return false; 2062 } 2063 return true; 2064 } 2065 2066 //////////////////////////////// mmap-based routines ///////////////////////////////// 2067 2068 // Reserve memory via mmap. 2069 // If <requested_addr> is given, an attempt is made to attach at the given address. 2070 // Failing that, memory is allocated at any address. 2071 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2072 // allocate at an address aligned with the given alignment. Failing that, memory 2073 // is aligned anywhere. 2074 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2075 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2076 "alignment_hint " UINTX_FORMAT "...", 2077 bytes, p2i(requested_addr), alignment_hint); 2078 2079 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2080 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2081 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr)); 2082 return NULL; 2083 } 2084 2085 // We must prevent anyone from attaching too close to the 2086 // BRK because that may cause malloc OOM. 2087 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2088 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2089 "Will attach anywhere.", p2i(requested_addr)); 2090 // Act like the OS refused to attach there. 2091 requested_addr = NULL; 2092 } 2093 2094 // Specify one or the other but not both. 2095 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2096 2097 // In 64K mode, we claim the global page size (os::vm_page_size()) 2098 // is 64K. This is one of the few points where that illusion may 2099 // break, because mmap() will always return memory aligned to 4K. So 2100 // we must ensure we only ever return memory aligned to 64k. 2101 if (alignment_hint) { 2102 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2103 } else { 2104 alignment_hint = os::vm_page_size(); 2105 } 2106 2107 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2108 const size_t size = align_up(bytes, os::vm_page_size()); 2109 2110 // alignment: Allocate memory large enough to include an aligned range of the right size and 2111 // cut off the leading and trailing waste pages. 2112 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2113 const size_t extra_size = size + alignment_hint; 2114 2115 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2116 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2117 int flags = MAP_ANONYMOUS | MAP_SHARED; 2118 2119 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2120 // it means if wishaddress is given but MAP_FIXED is not set. 2121 // 2122 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2123 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2124 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2125 // get clobbered. 2126 if (requested_addr != NULL) { 2127 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2128 flags |= MAP_FIXED; 2129 } 2130 } 2131 2132 char* addr = (char*)::mmap(requested_addr, extra_size, 2133 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2134 2135 if (addr == MAP_FAILED) { 2136 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno); 2137 return NULL; 2138 } 2139 2140 // Handle alignment. 2141 char* const addr_aligned = align_up(addr, alignment_hint); 2142 const size_t waste_pre = addr_aligned - addr; 2143 char* const addr_aligned_end = addr_aligned + size; 2144 const size_t waste_post = extra_size - waste_pre - size; 2145 if (waste_pre > 0) { 2146 ::munmap(addr, waste_pre); 2147 } 2148 if (waste_post > 0) { 2149 ::munmap(addr_aligned_end, waste_post); 2150 } 2151 addr = addr_aligned; 2152 2153 if (addr) { 2154 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2155 p2i(addr), p2i(addr + bytes), bytes); 2156 } else { 2157 if (requested_addr != NULL) { 2158 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr)); 2159 } else { 2160 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2161 } 2162 } 2163 2164 // bookkeeping 2165 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2166 2167 // Test alignment, see above. 2168 assert0(is_aligned_to(addr, os::vm_page_size())); 2169 2170 return addr; 2171 } 2172 2173 static bool release_mmaped_memory(char* addr, size_t size) { 2174 assert0(is_aligned_to(addr, os::vm_page_size())); 2175 assert0(is_aligned_to(size, os::vm_page_size())); 2176 2177 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2178 p2i(addr), p2i(addr + size - 1)); 2179 bool rc = false; 2180 2181 if (::munmap(addr, size) != 0) { 2182 trcVerbose("failed (%d)\n", errno); 2183 rc = false; 2184 } else { 2185 trcVerbose("ok."); 2186 rc = true; 2187 } 2188 2189 return rc; 2190 } 2191 2192 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2193 2194 assert0(is_aligned_to(addr, os::vm_page_size())); 2195 assert0(is_aligned_to(size, os::vm_page_size())); 2196 2197 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2198 p2i(addr), p2i(addr + size - 1)); 2199 bool rc = false; 2200 2201 // Uncommit mmap memory with msync MS_INVALIDATE. 2202 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2203 trcVerbose("failed (%d)\n", errno); 2204 rc = false; 2205 } else { 2206 trcVerbose("ok."); 2207 rc = true; 2208 } 2209 2210 return rc; 2211 } 2212 2213 int os::vm_page_size() { 2214 // Seems redundant as all get out. 2215 assert(os::Aix::page_size() != -1, "must call os::init"); 2216 return os::Aix::page_size(); 2217 } 2218 2219 // Aix allocates memory by pages. 2220 int os::vm_allocation_granularity() { 2221 assert(os::Aix::page_size() != -1, "must call os::init"); 2222 return os::Aix::page_size(); 2223 } 2224 2225 #ifdef PRODUCT 2226 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2227 int err) { 2228 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2229 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec, 2230 os::errno_name(err), err); 2231 } 2232 #endif 2233 2234 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2235 const char* mesg) { 2236 assert(mesg != NULL, "mesg must be specified"); 2237 if (!pd_commit_memory(addr, size, exec)) { 2238 // Add extra info in product mode for vm_exit_out_of_memory(): 2239 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2240 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2241 } 2242 } 2243 2244 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2245 2246 assert(is_aligned_to(addr, os::vm_page_size()), 2247 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2248 p2i(addr), os::vm_page_size()); 2249 assert(is_aligned_to(size, os::vm_page_size()), 2250 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2251 size, os::vm_page_size()); 2252 2253 vmembk_t* const vmi = vmembk_find(addr); 2254 guarantee0(vmi); 2255 vmi->assert_is_valid_subrange(addr, size); 2256 2257 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); 2258 2259 if (UseExplicitCommit) { 2260 // AIX commits memory on touch. So, touch all pages to be committed. 2261 for (char* p = addr; p < (addr + size); p += 4*K) { 2262 *p = '\0'; 2263 } 2264 } 2265 2266 return true; 2267 } 2268 2269 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2270 return pd_commit_memory(addr, size, exec); 2271 } 2272 2273 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2274 size_t alignment_hint, bool exec, 2275 const char* mesg) { 2276 // Alignment_hint is ignored on this OS. 2277 pd_commit_memory_or_exit(addr, size, exec, mesg); 2278 } 2279 2280 bool os::pd_uncommit_memory(char* addr, size_t size) { 2281 assert(is_aligned_to(addr, os::vm_page_size()), 2282 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2283 p2i(addr), os::vm_page_size()); 2284 assert(is_aligned_to(size, os::vm_page_size()), 2285 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2286 size, os::vm_page_size()); 2287 2288 // Dynamically do different things for mmap/shmat. 2289 const vmembk_t* const vmi = vmembk_find(addr); 2290 guarantee0(vmi); 2291 vmi->assert_is_valid_subrange(addr, size); 2292 2293 if (vmi->type == VMEM_SHMATED) { 2294 return uncommit_shmated_memory(addr, size); 2295 } else { 2296 return uncommit_mmaped_memory(addr, size); 2297 } 2298 } 2299 2300 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2301 // Do not call this; no need to commit stack pages on AIX. 2302 ShouldNotReachHere(); 2303 return true; 2304 } 2305 2306 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2307 // Do not call this; no need to commit stack pages on AIX. 2308 ShouldNotReachHere(); 2309 return true; 2310 } 2311 2312 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2313 } 2314 2315 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2316 } 2317 2318 void os::numa_make_global(char *addr, size_t bytes) { 2319 } 2320 2321 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2322 } 2323 2324 bool os::numa_topology_changed() { 2325 return false; 2326 } 2327 2328 size_t os::numa_get_groups_num() { 2329 return 1; 2330 } 2331 2332 int os::numa_get_group_id() { 2333 return 0; 2334 } 2335 2336 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2337 if (size > 0) { 2338 ids[0] = 0; 2339 return 1; 2340 } 2341 return 0; 2342 } 2343 2344 bool os::get_page_info(char *start, page_info* info) { 2345 return false; 2346 } 2347 2348 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2349 return end; 2350 } 2351 2352 // Reserves and attaches a shared memory segment. 2353 // Will assert if a wish address is given and could not be obtained. 2354 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2355 2356 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2357 // thereby clobbering old mappings at that place. That is probably 2358 // not intended, never used and almost certainly an error were it 2359 // ever be used this way (to try attaching at a specified address 2360 // without clobbering old mappings an alternate API exists, 2361 // os::attempt_reserve_memory_at()). 2362 // Instead of mimicking the dangerous coding of the other platforms, here I 2363 // just ignore the request address (release) or assert(debug). 2364 assert0(requested_addr == NULL); 2365 2366 // Always round to os::vm_page_size(), which may be larger than 4K. 2367 bytes = align_up(bytes, os::vm_page_size()); 2368 const size_t alignment_hint0 = 2369 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2370 2371 // In 4K mode always use mmap. 2372 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2373 if (os::vm_page_size() == 4*K) { 2374 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2375 } else { 2376 if (bytes >= Use64KPagesThreshold) { 2377 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2378 } else { 2379 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2380 } 2381 } 2382 } 2383 2384 bool os::pd_release_memory(char* addr, size_t size) { 2385 2386 // Dynamically do different things for mmap/shmat. 2387 vmembk_t* const vmi = vmembk_find(addr); 2388 guarantee0(vmi); 2389 2390 // Always round to os::vm_page_size(), which may be larger than 4K. 2391 size = align_up(size, os::vm_page_size()); 2392 addr = align_up(addr, os::vm_page_size()); 2393 2394 bool rc = false; 2395 bool remove_bookkeeping = false; 2396 if (vmi->type == VMEM_SHMATED) { 2397 // For shmatted memory, we do: 2398 // - If user wants to release the whole range, release the memory (shmdt). 2399 // - If user only wants to release a partial range, uncommit (disclaim) that 2400 // range. That way, at least, we do not use memory anymore (bust still page 2401 // table space). 2402 vmi->assert_is_valid_subrange(addr, size); 2403 if (addr == vmi->addr && size == vmi->size) { 2404 rc = release_shmated_memory(addr, size); 2405 remove_bookkeeping = true; 2406 } else { 2407 rc = uncommit_shmated_memory(addr, size); 2408 } 2409 } else { 2410 // User may unmap partial regions but region has to be fully contained. 2411 #ifdef ASSERT 2412 vmi->assert_is_valid_subrange(addr, size); 2413 #endif 2414 rc = release_mmaped_memory(addr, size); 2415 remove_bookkeeping = true; 2416 } 2417 2418 // update bookkeeping 2419 if (rc && remove_bookkeeping) { 2420 vmembk_remove(vmi); 2421 } 2422 2423 return rc; 2424 } 2425 2426 static bool checked_mprotect(char* addr, size_t size, int prot) { 2427 2428 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2429 // not tell me if protection failed when trying to protect an un-protectable range. 2430 // 2431 // This means if the memory was allocated using shmget/shmat, protection wont work 2432 // but mprotect will still return 0: 2433 // 2434 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2435 2436 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2437 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2438 2439 if (!rc) { 2440 const char* const s_errno = os::errno_name(errno); 2441 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2442 return false; 2443 } 2444 2445 // mprotect success check 2446 // 2447 // Mprotect said it changed the protection but can I believe it? 2448 // 2449 // To be sure I need to check the protection afterwards. Try to 2450 // read from protected memory and check whether that causes a segfault. 2451 // 2452 if (!os::Aix::xpg_sus_mode()) { 2453 2454 if (CanUseSafeFetch32()) { 2455 2456 const bool read_protected = 2457 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2458 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2459 2460 if (prot & PROT_READ) { 2461 rc = !read_protected; 2462 } else { 2463 rc = read_protected; 2464 } 2465 2466 if (!rc) { 2467 if (os::Aix::on_pase()) { 2468 // There is an issue on older PASE systems where mprotect() will return success but the 2469 // memory will not be protected. 2470 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2471 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2472 // a stack. It is an OS error. 2473 // 2474 // A valid strategy is just to try again. This usually works. :-/ 2475 2476 ::usleep(1000); 2477 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2478 if (::mprotect(addr, size, prot) == 0) { 2479 const bool read_protected_2 = 2480 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2481 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2482 rc = true; 2483 } 2484 } 2485 } 2486 } 2487 } 2488 2489 assert(rc == true, "mprotect failed."); 2490 2491 return rc; 2492 } 2493 2494 // Set protections specified 2495 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2496 unsigned int p = 0; 2497 switch (prot) { 2498 case MEM_PROT_NONE: p = PROT_NONE; break; 2499 case MEM_PROT_READ: p = PROT_READ; break; 2500 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2501 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2502 default: 2503 ShouldNotReachHere(); 2504 } 2505 // is_committed is unused. 2506 return checked_mprotect(addr, size, p); 2507 } 2508 2509 bool os::guard_memory(char* addr, size_t size) { 2510 return checked_mprotect(addr, size, PROT_NONE); 2511 } 2512 2513 bool os::unguard_memory(char* addr, size_t size) { 2514 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2515 } 2516 2517 // Large page support 2518 2519 static size_t _large_page_size = 0; 2520 2521 // Enable large page support if OS allows that. 2522 void os::large_page_init() { 2523 return; // Nothing to do. See query_multipage_support and friends. 2524 } 2525 2526 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2527 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement 2528 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()), 2529 // so this is not needed. 2530 assert(false, "should not be called on AIX"); 2531 return NULL; 2532 } 2533 2534 bool os::release_memory_special(char* base, size_t bytes) { 2535 // Detaching the SHM segment will also delete it, see reserve_memory_special(). 2536 Unimplemented(); 2537 return false; 2538 } 2539 2540 size_t os::large_page_size() { 2541 return _large_page_size; 2542 } 2543 2544 bool os::can_commit_large_page_memory() { 2545 // Does not matter, we do not support huge pages. 2546 return false; 2547 } 2548 2549 bool os::can_execute_large_page_memory() { 2550 // Does not matter, we do not support huge pages. 2551 return false; 2552 } 2553 2554 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2555 assert(file_desc >= 0, "file_desc is not valid"); 2556 char* result = NULL; 2557 2558 // Always round to os::vm_page_size(), which may be larger than 4K. 2559 bytes = align_up(bytes, os::vm_page_size()); 2560 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2561 2562 if (result != NULL) { 2563 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2564 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2565 } 2566 } 2567 return result; 2568 } 2569 2570 // Reserve memory at an arbitrary address, only if that area is 2571 // available (and not reserved for something else). 2572 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2573 char* addr = NULL; 2574 2575 // Always round to os::vm_page_size(), which may be larger than 4K. 2576 bytes = align_up(bytes, os::vm_page_size()); 2577 2578 // In 4K mode always use mmap. 2579 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2580 if (os::vm_page_size() == 4*K) { 2581 return reserve_mmaped_memory(bytes, requested_addr, 0); 2582 } else { 2583 if (bytes >= Use64KPagesThreshold) { 2584 return reserve_shmated_memory(bytes, requested_addr, 0); 2585 } else { 2586 return reserve_mmaped_memory(bytes, requested_addr, 0); 2587 } 2588 } 2589 2590 return addr; 2591 } 2592 2593 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2594 void os::infinite_sleep() { 2595 while (true) { // sleep forever ... 2596 ::sleep(100); // ... 100 seconds at a time 2597 } 2598 } 2599 2600 // Used to convert frequent JVM_Yield() to nops 2601 bool os::dont_yield() { 2602 return DontYieldALot; 2603 } 2604 2605 void os::naked_yield() { 2606 sched_yield(); 2607 } 2608 2609 //////////////////////////////////////////////////////////////////////////////// 2610 // thread priority support 2611 2612 // From AIX manpage to pthread_setschedparam 2613 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2614 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2615 // 2616 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2617 // range from 40 to 80, where 40 is the least favored priority and 80 2618 // is the most favored." 2619 // 2620 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2621 // scheduling there; however, this still leaves iSeries.) 2622 // 2623 // We use the same values for AIX and PASE. 2624 int os::java_to_os_priority[CriticalPriority + 1] = { 2625 54, // 0 Entry should never be used 2626 2627 55, // 1 MinPriority 2628 55, // 2 2629 56, // 3 2630 2631 56, // 4 2632 57, // 5 NormPriority 2633 57, // 6 2634 2635 58, // 7 2636 58, // 8 2637 59, // 9 NearMaxPriority 2638 2639 60, // 10 MaxPriority 2640 2641 60 // 11 CriticalPriority 2642 }; 2643 2644 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2645 if (!UseThreadPriorities) return OS_OK; 2646 pthread_t thr = thread->osthread()->pthread_id(); 2647 int policy = SCHED_OTHER; 2648 struct sched_param param; 2649 param.sched_priority = newpri; 2650 int ret = pthread_setschedparam(thr, policy, ¶m); 2651 2652 if (ret != 0) { 2653 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2654 (int)thr, newpri, ret, os::errno_name(ret)); 2655 } 2656 return (ret == 0) ? OS_OK : OS_ERR; 2657 } 2658 2659 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2660 if (!UseThreadPriorities) { 2661 *priority_ptr = java_to_os_priority[NormPriority]; 2662 return OS_OK; 2663 } 2664 pthread_t thr = thread->osthread()->pthread_id(); 2665 int policy = SCHED_OTHER; 2666 struct sched_param param; 2667 int ret = pthread_getschedparam(thr, &policy, ¶m); 2668 *priority_ptr = param.sched_priority; 2669 2670 return (ret == 0) ? OS_OK : OS_ERR; 2671 } 2672 2673 //////////////////////////////////////////////////////////////////////////////// 2674 // suspend/resume support 2675 2676 // The low-level signal-based suspend/resume support is a remnant from the 2677 // old VM-suspension that used to be for java-suspension, safepoints etc, 2678 // within hotspot. Currently used by JFR's OSThreadSampler 2679 // 2680 // The remaining code is greatly simplified from the more general suspension 2681 // code that used to be used. 2682 // 2683 // The protocol is quite simple: 2684 // - suspend: 2685 // - sends a signal to the target thread 2686 // - polls the suspend state of the osthread using a yield loop 2687 // - target thread signal handler (SR_handler) sets suspend state 2688 // and blocks in sigsuspend until continued 2689 // - resume: 2690 // - sets target osthread state to continue 2691 // - sends signal to end the sigsuspend loop in the SR_handler 2692 // 2693 // Note that the SR_lock plays no role in this suspend/resume protocol, 2694 // but is checked for NULL in SR_handler as a thread termination indicator. 2695 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2696 // 2697 // Note that resume_clear_context() and suspend_save_context() are needed 2698 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2699 // which in part is used by: 2700 // - Forte Analyzer: AsyncGetCallTrace() 2701 // - StackBanging: get_frame_at_stack_banging_point() 2702 2703 static void resume_clear_context(OSThread *osthread) { 2704 osthread->set_ucontext(NULL); 2705 osthread->set_siginfo(NULL); 2706 } 2707 2708 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2709 osthread->set_ucontext(context); 2710 osthread->set_siginfo(siginfo); 2711 } 2712 2713 // 2714 // Handler function invoked when a thread's execution is suspended or 2715 // resumed. We have to be careful that only async-safe functions are 2716 // called here (Note: most pthread functions are not async safe and 2717 // should be avoided.) 2718 // 2719 // Note: sigwait() is a more natural fit than sigsuspend() from an 2720 // interface point of view, but sigwait() prevents the signal hander 2721 // from being run. libpthread would get very confused by not having 2722 // its signal handlers run and prevents sigwait()'s use with the 2723 // mutex granting granting signal. 2724 // 2725 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2726 // 2727 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2728 // Save and restore errno to avoid confusing native code with EINTR 2729 // after sigsuspend. 2730 int old_errno = errno; 2731 2732 Thread* thread = Thread::current_or_null_safe(); 2733 assert(thread != NULL, "Missing current thread in SR_handler"); 2734 2735 // On some systems we have seen signal delivery get "stuck" until the signal 2736 // mask is changed as part of thread termination. Check that the current thread 2737 // has not already terminated (via SR_lock()) - else the following assertion 2738 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2739 // destructor has completed. 2740 2741 if (thread->SR_lock() == NULL) { 2742 return; 2743 } 2744 2745 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2746 2747 OSThread* osthread = thread->osthread(); 2748 2749 os::SuspendResume::State current = osthread->sr.state(); 2750 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2751 suspend_save_context(osthread, siginfo, context); 2752 2753 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2754 os::SuspendResume::State state = osthread->sr.suspended(); 2755 if (state == os::SuspendResume::SR_SUSPENDED) { 2756 sigset_t suspend_set; // signals for sigsuspend() 2757 sigemptyset(&suspend_set); 2758 // get current set of blocked signals and unblock resume signal 2759 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2760 sigdelset(&suspend_set, SR_signum); 2761 2762 // wait here until we are resumed 2763 while (1) { 2764 sigsuspend(&suspend_set); 2765 2766 os::SuspendResume::State result = osthread->sr.running(); 2767 if (result == os::SuspendResume::SR_RUNNING) { 2768 break; 2769 } 2770 } 2771 2772 } else if (state == os::SuspendResume::SR_RUNNING) { 2773 // request was cancelled, continue 2774 } else { 2775 ShouldNotReachHere(); 2776 } 2777 2778 resume_clear_context(osthread); 2779 } else if (current == os::SuspendResume::SR_RUNNING) { 2780 // request was cancelled, continue 2781 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2782 // ignore 2783 } else { 2784 ShouldNotReachHere(); 2785 } 2786 2787 errno = old_errno; 2788 } 2789 2790 static int SR_initialize() { 2791 struct sigaction act; 2792 char *s; 2793 // Get signal number to use for suspend/resume 2794 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2795 int sig = ::strtol(s, 0, 10); 2796 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2797 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2798 SR_signum = sig; 2799 } else { 2800 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2801 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2802 } 2803 } 2804 2805 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2806 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2807 2808 sigemptyset(&SR_sigset); 2809 sigaddset(&SR_sigset, SR_signum); 2810 2811 // Set up signal handler for suspend/resume. 2812 act.sa_flags = SA_RESTART|SA_SIGINFO; 2813 act.sa_handler = (void (*)(int)) SR_handler; 2814 2815 // SR_signum is blocked by default. 2816 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2817 2818 if (sigaction(SR_signum, &act, 0) == -1) { 2819 return -1; 2820 } 2821 2822 // Save signal flag 2823 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2824 return 0; 2825 } 2826 2827 static int SR_finalize() { 2828 return 0; 2829 } 2830 2831 static int sr_notify(OSThread* osthread) { 2832 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2833 assert_status(status == 0, status, "pthread_kill"); 2834 return status; 2835 } 2836 2837 // "Randomly" selected value for how long we want to spin 2838 // before bailing out on suspending a thread, also how often 2839 // we send a signal to a thread we want to resume 2840 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2841 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2842 2843 // returns true on success and false on error - really an error is fatal 2844 // but this seems the normal response to library errors 2845 static bool do_suspend(OSThread* osthread) { 2846 assert(osthread->sr.is_running(), "thread should be running"); 2847 // mark as suspended and send signal 2848 2849 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2850 // failed to switch, state wasn't running? 2851 ShouldNotReachHere(); 2852 return false; 2853 } 2854 2855 if (sr_notify(osthread) != 0) { 2856 // try to cancel, switch to running 2857 2858 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2859 if (result == os::SuspendResume::SR_RUNNING) { 2860 // cancelled 2861 return false; 2862 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2863 // somehow managed to suspend 2864 return true; 2865 } else { 2866 ShouldNotReachHere(); 2867 return false; 2868 } 2869 } 2870 2871 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2872 2873 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2874 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2875 os::naked_yield(); 2876 } 2877 2878 // timeout, try to cancel the request 2879 if (n >= RANDOMLY_LARGE_INTEGER) { 2880 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2881 if (cancelled == os::SuspendResume::SR_RUNNING) { 2882 return false; 2883 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2884 return true; 2885 } else { 2886 ShouldNotReachHere(); 2887 return false; 2888 } 2889 } 2890 } 2891 2892 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2893 return true; 2894 } 2895 2896 static void do_resume(OSThread* osthread) { 2897 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2898 2899 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2900 // failed to switch to WAKEUP_REQUEST 2901 ShouldNotReachHere(); 2902 return; 2903 } 2904 2905 while (!osthread->sr.is_running()) { 2906 if (sr_notify(osthread) == 0) { 2907 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2908 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2909 os::naked_yield(); 2910 } 2911 } 2912 } else { 2913 ShouldNotReachHere(); 2914 } 2915 } 2916 2917 guarantee(osthread->sr.is_running(), "Must be running!"); 2918 } 2919 2920 /////////////////////////////////////////////////////////////////////////////////// 2921 // signal handling (except suspend/resume) 2922 2923 // This routine may be used by user applications as a "hook" to catch signals. 2924 // The user-defined signal handler must pass unrecognized signals to this 2925 // routine, and if it returns true (non-zero), then the signal handler must 2926 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2927 // routine will never retun false (zero), but instead will execute a VM panic 2928 // routine kill the process. 2929 // 2930 // If this routine returns false, it is OK to call it again. This allows 2931 // the user-defined signal handler to perform checks either before or after 2932 // the VM performs its own checks. Naturally, the user code would be making 2933 // a serious error if it tried to handle an exception (such as a null check 2934 // or breakpoint) that the VM was generating for its own correct operation. 2935 // 2936 // This routine may recognize any of the following kinds of signals: 2937 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2938 // It should be consulted by handlers for any of those signals. 2939 // 2940 // The caller of this routine must pass in the three arguments supplied 2941 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2942 // field of the structure passed to sigaction(). This routine assumes that 2943 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2944 // 2945 // Note that the VM will print warnings if it detects conflicting signal 2946 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2947 // 2948 extern "C" JNIEXPORT int 2949 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 2950 2951 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 2952 // to be the thing to call; documentation is not terribly clear about whether 2953 // pthread_sigmask also works, and if it does, whether it does the same. 2954 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 2955 const int rc = ::pthread_sigmask(how, set, oset); 2956 // return value semantics differ slightly for error case: 2957 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 2958 // (so, pthread_sigmask is more theadsafe for error handling) 2959 // But success is always 0. 2960 return rc == 0 ? true : false; 2961 } 2962 2963 // Function to unblock all signals which are, according 2964 // to POSIX, typical program error signals. If they happen while being blocked, 2965 // they typically will bring down the process immediately. 2966 bool unblock_program_error_signals() { 2967 sigset_t set; 2968 ::sigemptyset(&set); 2969 ::sigaddset(&set, SIGILL); 2970 ::sigaddset(&set, SIGBUS); 2971 ::sigaddset(&set, SIGFPE); 2972 ::sigaddset(&set, SIGSEGV); 2973 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 2974 } 2975 2976 // Renamed from 'signalHandler' to avoid collision with other shared libs. 2977 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 2978 assert(info != NULL && uc != NULL, "it must be old kernel"); 2979 2980 // Never leave program error signals blocked; 2981 // on all our platforms they would bring down the process immediately when 2982 // getting raised while being blocked. 2983 unblock_program_error_signals(); 2984 2985 int orig_errno = errno; // Preserve errno value over signal handler. 2986 JVM_handle_aix_signal(sig, info, uc, true); 2987 errno = orig_errno; 2988 } 2989 2990 // This boolean allows users to forward their own non-matching signals 2991 // to JVM_handle_aix_signal, harmlessly. 2992 bool os::Aix::signal_handlers_are_installed = false; 2993 2994 // For signal-chaining 2995 bool os::Aix::libjsig_is_loaded = false; 2996 typedef struct sigaction *(*get_signal_t)(int); 2997 get_signal_t os::Aix::get_signal_action = NULL; 2998 2999 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3000 struct sigaction *actp = NULL; 3001 3002 if (libjsig_is_loaded) { 3003 // Retrieve the old signal handler from libjsig 3004 actp = (*get_signal_action)(sig); 3005 } 3006 if (actp == NULL) { 3007 // Retrieve the preinstalled signal handler from jvm 3008 actp = os::Posix::get_preinstalled_handler(sig); 3009 } 3010 3011 return actp; 3012 } 3013 3014 static bool call_chained_handler(struct sigaction *actp, int sig, 3015 siginfo_t *siginfo, void *context) { 3016 // Call the old signal handler 3017 if (actp->sa_handler == SIG_DFL) { 3018 // It's more reasonable to let jvm treat it as an unexpected exception 3019 // instead of taking the default action. 3020 return false; 3021 } else if (actp->sa_handler != SIG_IGN) { 3022 if ((actp->sa_flags & SA_NODEFER) == 0) { 3023 // automaticlly block the signal 3024 sigaddset(&(actp->sa_mask), sig); 3025 } 3026 3027 sa_handler_t hand = NULL; 3028 sa_sigaction_t sa = NULL; 3029 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3030 // retrieve the chained handler 3031 if (siginfo_flag_set) { 3032 sa = actp->sa_sigaction; 3033 } else { 3034 hand = actp->sa_handler; 3035 } 3036 3037 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3038 actp->sa_handler = SIG_DFL; 3039 } 3040 3041 // try to honor the signal mask 3042 sigset_t oset; 3043 sigemptyset(&oset); 3044 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3045 3046 // call into the chained handler 3047 if (siginfo_flag_set) { 3048 (*sa)(sig, siginfo, context); 3049 } else { 3050 (*hand)(sig); 3051 } 3052 3053 // restore the signal mask 3054 pthread_sigmask(SIG_SETMASK, &oset, NULL); 3055 } 3056 // Tell jvm's signal handler the signal is taken care of. 3057 return true; 3058 } 3059 3060 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3061 bool chained = false; 3062 // signal-chaining 3063 if (UseSignalChaining) { 3064 struct sigaction *actp = get_chained_signal_action(sig); 3065 if (actp != NULL) { 3066 chained = call_chained_handler(actp, sig, siginfo, context); 3067 } 3068 } 3069 return chained; 3070 } 3071 3072 // for diagnostic 3073 int sigflags[NSIG]; 3074 3075 int os::Aix::get_our_sigflags(int sig) { 3076 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3077 return sigflags[sig]; 3078 } 3079 3080 void os::Aix::set_our_sigflags(int sig, int flags) { 3081 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3082 if (sig > 0 && sig < NSIG) { 3083 sigflags[sig] = flags; 3084 } 3085 } 3086 3087 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3088 // Check for overwrite. 3089 struct sigaction oldAct; 3090 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3091 3092 void* oldhand = oldAct.sa_sigaction 3093 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3094 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3095 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3096 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3097 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3098 if (AllowUserSignalHandlers || !set_installed) { 3099 // Do not overwrite; user takes responsibility to forward to us. 3100 return; 3101 } else if (UseSignalChaining) { 3102 // save the old handler in jvm 3103 os::Posix::save_preinstalled_handler(sig, oldAct); 3104 // libjsig also interposes the sigaction() call below and saves the 3105 // old sigaction on it own. 3106 } else { 3107 fatal("Encountered unexpected pre-existing sigaction handler " 3108 "%#lx for signal %d.", (long)oldhand, sig); 3109 } 3110 } 3111 3112 struct sigaction sigAct; 3113 sigfillset(&(sigAct.sa_mask)); 3114 if (!set_installed) { 3115 sigAct.sa_handler = SIG_DFL; 3116 sigAct.sa_flags = SA_RESTART; 3117 } else { 3118 sigAct.sa_sigaction = javaSignalHandler; 3119 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3120 } 3121 // Save flags, which are set by ours 3122 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3123 sigflags[sig] = sigAct.sa_flags; 3124 3125 int ret = sigaction(sig, &sigAct, &oldAct); 3126 assert(ret == 0, "check"); 3127 3128 void* oldhand2 = oldAct.sa_sigaction 3129 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3130 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3131 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3132 } 3133 3134 // install signal handlers for signals that HotSpot needs to 3135 // handle in order to support Java-level exception handling. 3136 void os::Aix::install_signal_handlers() { 3137 if (!signal_handlers_are_installed) { 3138 signal_handlers_are_installed = true; 3139 3140 // signal-chaining 3141 typedef void (*signal_setting_t)(); 3142 signal_setting_t begin_signal_setting = NULL; 3143 signal_setting_t end_signal_setting = NULL; 3144 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3145 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3146 if (begin_signal_setting != NULL) { 3147 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3148 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3149 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3150 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3151 libjsig_is_loaded = true; 3152 assert(UseSignalChaining, "should enable signal-chaining"); 3153 } 3154 if (libjsig_is_loaded) { 3155 // Tell libjsig jvm is setting signal handlers. 3156 (*begin_signal_setting)(); 3157 } 3158 3159 set_signal_handler(SIGSEGV, true); 3160 set_signal_handler(SIGPIPE, true); 3161 set_signal_handler(SIGBUS, true); 3162 set_signal_handler(SIGILL, true); 3163 set_signal_handler(SIGFPE, true); 3164 set_signal_handler(SIGTRAP, true); 3165 set_signal_handler(SIGXFSZ, true); 3166 3167 if (libjsig_is_loaded) { 3168 // Tell libjsig jvm finishes setting signal handlers. 3169 (*end_signal_setting)(); 3170 } 3171 3172 // We don't activate signal checker if libjsig is in place, we trust ourselves 3173 // and if UserSignalHandler is installed all bets are off. 3174 // Log that signal checking is off only if -verbose:jni is specified. 3175 if (CheckJNICalls) { 3176 if (libjsig_is_loaded) { 3177 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3178 check_signals = false; 3179 } 3180 if (AllowUserSignalHandlers) { 3181 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3182 check_signals = false; 3183 } 3184 // Need to initialize check_signal_done. 3185 ::sigemptyset(&check_signal_done); 3186 } 3187 } 3188 } 3189 3190 static const char* get_signal_handler_name(address handler, 3191 char* buf, int buflen) { 3192 int offset; 3193 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3194 if (found) { 3195 // skip directory names 3196 const char *p1, *p2; 3197 p1 = buf; 3198 size_t len = strlen(os::file_separator()); 3199 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3200 // The way os::dll_address_to_library_name is implemented on Aix 3201 // right now, it always returns -1 for the offset which is not 3202 // terribly informative. 3203 // Will fix that. For now, omit the offset. 3204 jio_snprintf(buf, buflen, "%s", p1); 3205 } else { 3206 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3207 } 3208 return buf; 3209 } 3210 3211 static void print_signal_handler(outputStream* st, int sig, 3212 char* buf, size_t buflen) { 3213 struct sigaction sa; 3214 sigaction(sig, NULL, &sa); 3215 3216 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3217 3218 address handler = (sa.sa_flags & SA_SIGINFO) 3219 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3220 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3221 3222 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3223 st->print("SIG_DFL"); 3224 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3225 st->print("SIG_IGN"); 3226 } else { 3227 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3228 } 3229 3230 // Print readable mask. 3231 st->print(", sa_mask[0]="); 3232 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3233 3234 address rh = VMError::get_resetted_sighandler(sig); 3235 // May be, handler was resetted by VMError? 3236 if (rh != NULL) { 3237 handler = rh; 3238 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3239 } 3240 3241 // Print textual representation of sa_flags. 3242 st->print(", sa_flags="); 3243 os::Posix::print_sa_flags(st, sa.sa_flags); 3244 3245 // Check: is it our handler? 3246 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3247 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3248 // It is our signal handler. 3249 // Check for flags, reset system-used one! 3250 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3251 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3252 os::Aix::get_our_sigflags(sig)); 3253 } 3254 } 3255 st->cr(); 3256 } 3257 3258 #define DO_SIGNAL_CHECK(sig) \ 3259 if (!sigismember(&check_signal_done, sig)) \ 3260 os::Aix::check_signal_handler(sig) 3261 3262 // This method is a periodic task to check for misbehaving JNI applications 3263 // under CheckJNI, we can add any periodic checks here 3264 3265 void os::run_periodic_checks() { 3266 3267 if (check_signals == false) return; 3268 3269 // SEGV and BUS if overridden could potentially prevent 3270 // generation of hs*.log in the event of a crash, debugging 3271 // such a case can be very challenging, so we absolutely 3272 // check the following for a good measure: 3273 DO_SIGNAL_CHECK(SIGSEGV); 3274 DO_SIGNAL_CHECK(SIGILL); 3275 DO_SIGNAL_CHECK(SIGFPE); 3276 DO_SIGNAL_CHECK(SIGBUS); 3277 DO_SIGNAL_CHECK(SIGPIPE); 3278 DO_SIGNAL_CHECK(SIGXFSZ); 3279 if (UseSIGTRAP) { 3280 DO_SIGNAL_CHECK(SIGTRAP); 3281 } 3282 3283 // ReduceSignalUsage allows the user to override these handlers 3284 // see comments at the very top and jvm_md.h 3285 if (!ReduceSignalUsage) { 3286 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3287 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3288 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3289 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3290 } 3291 3292 DO_SIGNAL_CHECK(SR_signum); 3293 } 3294 3295 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3296 3297 static os_sigaction_t os_sigaction = NULL; 3298 3299 void os::Aix::check_signal_handler(int sig) { 3300 char buf[O_BUFLEN]; 3301 address jvmHandler = NULL; 3302 3303 struct sigaction act; 3304 if (os_sigaction == NULL) { 3305 // only trust the default sigaction, in case it has been interposed 3306 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3307 if (os_sigaction == NULL) return; 3308 } 3309 3310 os_sigaction(sig, (struct sigaction*)NULL, &act); 3311 3312 address thisHandler = (act.sa_flags & SA_SIGINFO) 3313 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3314 : CAST_FROM_FN_PTR(address, act.sa_handler); 3315 3316 switch(sig) { 3317 case SIGSEGV: 3318 case SIGBUS: 3319 case SIGFPE: 3320 case SIGPIPE: 3321 case SIGILL: 3322 case SIGXFSZ: 3323 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3324 break; 3325 3326 case SHUTDOWN1_SIGNAL: 3327 case SHUTDOWN2_SIGNAL: 3328 case SHUTDOWN3_SIGNAL: 3329 case BREAK_SIGNAL: 3330 jvmHandler = (address)user_handler(); 3331 break; 3332 3333 default: 3334 if (sig == SR_signum) { 3335 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3336 } else { 3337 return; 3338 } 3339 break; 3340 } 3341 3342 if (thisHandler != jvmHandler) { 3343 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3344 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3345 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3346 // No need to check this sig any longer 3347 sigaddset(&check_signal_done, sig); 3348 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3349 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3350 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3351 exception_name(sig, buf, O_BUFLEN)); 3352 } 3353 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3354 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3355 tty->print("expected:"); 3356 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3357 tty->cr(); 3358 tty->print(" found:"); 3359 os::Posix::print_sa_flags(tty, act.sa_flags); 3360 tty->cr(); 3361 // No need to check this sig any longer 3362 sigaddset(&check_signal_done, sig); 3363 } 3364 3365 // Dump all the signal 3366 if (sigismember(&check_signal_done, sig)) { 3367 print_signal_handlers(tty, buf, O_BUFLEN); 3368 } 3369 } 3370 3371 // To install functions for atexit system call 3372 extern "C" { 3373 static void perfMemory_exit_helper() { 3374 perfMemory_exit(); 3375 } 3376 } 3377 3378 // This is called _before_ the most of global arguments have been parsed. 3379 void os::init(void) { 3380 // This is basic, we want to know if that ever changes. 3381 // (Shared memory boundary is supposed to be a 256M aligned.) 3382 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3383 3384 // Record process break at startup. 3385 g_brk_at_startup = (address) ::sbrk(0); 3386 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3387 3388 // First off, we need to know whether we run on AIX or PASE, and 3389 // the OS level we run on. 3390 os::Aix::initialize_os_info(); 3391 3392 // Scan environment (SPEC1170 behaviour, etc). 3393 os::Aix::scan_environment(); 3394 3395 // Probe multipage support. 3396 query_multipage_support(); 3397 3398 // Act like we only have one page size by eliminating corner cases which 3399 // we did not support very well anyway. 3400 // We have two input conditions: 3401 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3402 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3403 // setting. 3404 // Data segment page size is important for us because it defines the thread stack page 3405 // size, which is needed for guard page handling, stack banging etc. 3406 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3407 // and should be allocated with 64k pages. 3408 // 3409 // So, we do the following: 3410 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3411 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3412 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3413 // 64k no --- AIX 5.2 ? --- 3414 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3415 3416 // We explicitly leave no option to change page size, because only upgrading would work, 3417 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3418 3419 if (g_multipage_support.datapsize == 4*K) { 3420 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3421 if (g_multipage_support.can_use_64K_pages) { 3422 // .. but we are able to use 64K pages dynamically. 3423 // This would be typical for java launchers which are not linked 3424 // with datapsize=64K (like, any other launcher but our own). 3425 // 3426 // In this case it would be smart to allocate the java heap with 64K 3427 // to get the performance benefit, and to fake 64k pages for the 3428 // data segment (when dealing with thread stacks). 3429 // 3430 // However, leave a possibility to downgrade to 4K, using 3431 // -XX:-Use64KPages. 3432 if (Use64KPages) { 3433 trcVerbose("64K page mode (faked for data segment)"); 3434 Aix::_page_size = 64*K; 3435 } else { 3436 trcVerbose("4K page mode (Use64KPages=off)"); 3437 Aix::_page_size = 4*K; 3438 } 3439 } else { 3440 // .. and not able to allocate 64k pages dynamically. Here, just 3441 // fall back to 4K paged mode and use mmap for everything. 3442 trcVerbose("4K page mode"); 3443 Aix::_page_size = 4*K; 3444 FLAG_SET_ERGO(Use64KPages, false); 3445 } 3446 } else { 3447 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3448 // This normally means that we can allocate 64k pages dynamically. 3449 // (There is one special case where this may be false: EXTSHM=on. 3450 // but we decided to not support that mode). 3451 assert0(g_multipage_support.can_use_64K_pages); 3452 Aix::_page_size = 64*K; 3453 trcVerbose("64K page mode"); 3454 FLAG_SET_ERGO(Use64KPages, true); 3455 } 3456 3457 // For now UseLargePages is just ignored. 3458 FLAG_SET_ERGO(UseLargePages, false); 3459 _page_sizes[0] = 0; 3460 3461 // debug trace 3462 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3463 3464 // Next, we need to initialize libo4 and libperfstat libraries. 3465 if (os::Aix::on_pase()) { 3466 os::Aix::initialize_libo4(); 3467 } else { 3468 os::Aix::initialize_libperfstat(); 3469 } 3470 3471 // Reset the perfstat information provided by ODM. 3472 if (os::Aix::on_aix()) { 3473 libperfstat::perfstat_reset(); 3474 } 3475 3476 // Now initialze basic system properties. Note that for some of the values we 3477 // need libperfstat etc. 3478 os::Aix::initialize_system_info(); 3479 3480 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3481 3482 init_random(1234567); 3483 3484 // _main_thread points to the thread that created/loaded the JVM. 3485 Aix::_main_thread = pthread_self(); 3486 3487 initial_time_count = javaTimeNanos(); 3488 3489 os::Posix::init(); 3490 } 3491 3492 // This is called _after_ the global arguments have been parsed. 3493 jint os::init_2(void) { 3494 3495 // This could be set after os::Posix::init() but all platforms 3496 // have to set it the same so we have to mirror Solaris. 3497 DEBUG_ONLY(os::set_mutex_init_done();) 3498 3499 os::Posix::init_2(); 3500 3501 if (os::Aix::on_pase()) { 3502 trcVerbose("Running on PASE."); 3503 } else { 3504 trcVerbose("Running on AIX (not PASE)."); 3505 } 3506 3507 trcVerbose("processor count: %d", os::_processor_count); 3508 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3509 3510 // Initially build up the loaded dll map. 3511 LoadedLibraries::reload(); 3512 if (Verbose) { 3513 trcVerbose("Loaded Libraries: "); 3514 LoadedLibraries::print(tty); 3515 } 3516 3517 // initialize suspend/resume support - must do this before signal_sets_init() 3518 if (SR_initialize() != 0) { 3519 perror("SR_initialize failed"); 3520 return JNI_ERR; 3521 } 3522 3523 Aix::signal_sets_init(); 3524 Aix::install_signal_handlers(); 3525 // Initialize data for jdk.internal.misc.Signal 3526 if (!ReduceSignalUsage) { 3527 jdk_misc_signal_init(); 3528 } 3529 3530 // Check and sets minimum stack sizes against command line options 3531 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3532 return JNI_ERR; 3533 } 3534 3535 if (UseNUMA) { 3536 UseNUMA = false; 3537 warning("NUMA optimizations are not available on this OS."); 3538 } 3539 3540 if (MaxFDLimit) { 3541 // Set the number of file descriptors to max. print out error 3542 // if getrlimit/setrlimit fails but continue regardless. 3543 struct rlimit nbr_files; 3544 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3545 if (status != 0) { 3546 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3547 } else { 3548 nbr_files.rlim_cur = nbr_files.rlim_max; 3549 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3550 if (status != 0) { 3551 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3552 } 3553 } 3554 } 3555 3556 if (PerfAllowAtExitRegistration) { 3557 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3558 // At exit functions can be delayed until process exit time, which 3559 // can be problematic for embedded VM situations. Embedded VMs should 3560 // call DestroyJavaVM() to assure that VM resources are released. 3561 3562 // Note: perfMemory_exit_helper atexit function may be removed in 3563 // the future if the appropriate cleanup code can be added to the 3564 // VM_Exit VMOperation's doit method. 3565 if (atexit(perfMemory_exit_helper) != 0) { 3566 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3567 } 3568 } 3569 3570 return JNI_OK; 3571 } 3572 3573 // Mark the polling page as unreadable 3574 void os::make_polling_page_unreadable(void) { 3575 if (!guard_memory((char*)_polling_page, Aix::page_size())) { 3576 fatal("Could not disable polling page"); 3577 } 3578 }; 3579 3580 // Mark the polling page as readable 3581 void os::make_polling_page_readable(void) { 3582 // Changed according to os_linux.cpp. 3583 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { 3584 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page); 3585 } 3586 }; 3587 3588 int os::active_processor_count() { 3589 // User has overridden the number of active processors 3590 if (ActiveProcessorCount > 0) { 3591 log_trace(os)("active_processor_count: " 3592 "active processor count set by user : %d", 3593 ActiveProcessorCount); 3594 return ActiveProcessorCount; 3595 } 3596 3597 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3598 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3599 return online_cpus; 3600 } 3601 3602 void os::set_native_thread_name(const char *name) { 3603 // Not yet implemented. 3604 return; 3605 } 3606 3607 bool os::bind_to_processor(uint processor_id) { 3608 // Not yet implemented. 3609 return false; 3610 } 3611 3612 void os::SuspendedThreadTask::internal_do_task() { 3613 if (do_suspend(_thread->osthread())) { 3614 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3615 do_task(context); 3616 do_resume(_thread->osthread()); 3617 } 3618 } 3619 3620 //////////////////////////////////////////////////////////////////////////////// 3621 // debug support 3622 3623 bool os::find(address addr, outputStream* st) { 3624 3625 st->print(PTR_FORMAT ": ", addr); 3626 3627 loaded_module_t lm; 3628 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3629 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3630 st->print_cr("%s", lm.path); 3631 return true; 3632 } 3633 3634 return false; 3635 } 3636 3637 //////////////////////////////////////////////////////////////////////////////// 3638 // misc 3639 3640 // This does not do anything on Aix. This is basically a hook for being 3641 // able to use structured exception handling (thread-local exception filters) 3642 // on, e.g., Win32. 3643 void 3644 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3645 JavaCallArguments* args, Thread* thread) { 3646 f(value, method, args, thread); 3647 } 3648 3649 void os::print_statistics() { 3650 } 3651 3652 bool os::message_box(const char* title, const char* message) { 3653 int i; 3654 fdStream err(defaultStream::error_fd()); 3655 for (i = 0; i < 78; i++) err.print_raw("="); 3656 err.cr(); 3657 err.print_raw_cr(title); 3658 for (i = 0; i < 78; i++) err.print_raw("-"); 3659 err.cr(); 3660 err.print_raw_cr(message); 3661 for (i = 0; i < 78; i++) err.print_raw("="); 3662 err.cr(); 3663 3664 char buf[16]; 3665 // Prevent process from exiting upon "read error" without consuming all CPU 3666 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3667 3668 return buf[0] == 'y' || buf[0] == 'Y'; 3669 } 3670 3671 // Is a (classpath) directory empty? 3672 bool os::dir_is_empty(const char* path) { 3673 DIR *dir = NULL; 3674 struct dirent *ptr; 3675 3676 dir = opendir(path); 3677 if (dir == NULL) return true; 3678 3679 /* Scan the directory */ 3680 bool result = true; 3681 while (result && (ptr = readdir(dir)) != NULL) { 3682 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3683 result = false; 3684 } 3685 } 3686 closedir(dir); 3687 return result; 3688 } 3689 3690 // This code originates from JDK's sysOpen and open64_w 3691 // from src/solaris/hpi/src/system_md.c 3692 3693 int os::open(const char *path, int oflag, int mode) { 3694 3695 if (strlen(path) > MAX_PATH - 1) { 3696 errno = ENAMETOOLONG; 3697 return -1; 3698 } 3699 int fd; 3700 3701 fd = ::open64(path, oflag, mode); 3702 if (fd == -1) return -1; 3703 3704 // If the open succeeded, the file might still be a directory. 3705 { 3706 struct stat64 buf64; 3707 int ret = ::fstat64(fd, &buf64); 3708 int st_mode = buf64.st_mode; 3709 3710 if (ret != -1) { 3711 if ((st_mode & S_IFMT) == S_IFDIR) { 3712 errno = EISDIR; 3713 ::close(fd); 3714 return -1; 3715 } 3716 } else { 3717 ::close(fd); 3718 return -1; 3719 } 3720 } 3721 3722 // All file descriptors that are opened in the JVM and not 3723 // specifically destined for a subprocess should have the 3724 // close-on-exec flag set. If we don't set it, then careless 3rd 3725 // party native code might fork and exec without closing all 3726 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3727 // UNIXProcess.c), and this in turn might: 3728 // 3729 // - cause end-of-file to fail to be detected on some file 3730 // descriptors, resulting in mysterious hangs, or 3731 // 3732 // - might cause an fopen in the subprocess to fail on a system 3733 // suffering from bug 1085341. 3734 // 3735 // (Yes, the default setting of the close-on-exec flag is a Unix 3736 // design flaw.) 3737 // 3738 // See: 3739 // 1085341: 32-bit stdio routines should support file descriptors >255 3740 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3741 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3742 #ifdef FD_CLOEXEC 3743 { 3744 int flags = ::fcntl(fd, F_GETFD); 3745 if (flags != -1) 3746 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3747 } 3748 #endif 3749 3750 return fd; 3751 } 3752 3753 // create binary file, rewriting existing file if required 3754 int os::create_binary_file(const char* path, bool rewrite_existing) { 3755 int oflags = O_WRONLY | O_CREAT; 3756 if (!rewrite_existing) { 3757 oflags |= O_EXCL; 3758 } 3759 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3760 } 3761 3762 // return current position of file pointer 3763 jlong os::current_file_offset(int fd) { 3764 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3765 } 3766 3767 // move file pointer to the specified offset 3768 jlong os::seek_to_file_offset(int fd, jlong offset) { 3769 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3770 } 3771 3772 // This code originates from JDK's sysAvailable 3773 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3774 3775 int os::available(int fd, jlong *bytes) { 3776 jlong cur, end; 3777 int mode; 3778 struct stat64 buf64; 3779 3780 if (::fstat64(fd, &buf64) >= 0) { 3781 mode = buf64.st_mode; 3782 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3783 int n; 3784 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3785 *bytes = n; 3786 return 1; 3787 } 3788 } 3789 } 3790 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3791 return 0; 3792 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3793 return 0; 3794 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3795 return 0; 3796 } 3797 *bytes = end - cur; 3798 return 1; 3799 } 3800 3801 // Map a block of memory. 3802 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3803 char *addr, size_t bytes, bool read_only, 3804 bool allow_exec) { 3805 int prot; 3806 int flags = MAP_PRIVATE; 3807 3808 if (read_only) { 3809 prot = PROT_READ; 3810 flags = MAP_SHARED; 3811 } else { 3812 prot = PROT_READ | PROT_WRITE; 3813 flags = MAP_PRIVATE; 3814 } 3815 3816 if (allow_exec) { 3817 prot |= PROT_EXEC; 3818 } 3819 3820 if (addr != NULL) { 3821 flags |= MAP_FIXED; 3822 } 3823 3824 // Allow anonymous mappings if 'fd' is -1. 3825 if (fd == -1) { 3826 flags |= MAP_ANONYMOUS; 3827 } 3828 3829 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3830 fd, file_offset); 3831 if (mapped_address == MAP_FAILED) { 3832 return NULL; 3833 } 3834 return mapped_address; 3835 } 3836 3837 // Remap a block of memory. 3838 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3839 char *addr, size_t bytes, bool read_only, 3840 bool allow_exec) { 3841 // same as map_memory() on this OS 3842 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3843 allow_exec); 3844 } 3845 3846 // Unmap a block of memory. 3847 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3848 return munmap(addr, bytes) == 0; 3849 } 3850 3851 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3852 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3853 // of a thread. 3854 // 3855 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3856 // the fast estimate available on the platform. 3857 3858 jlong os::current_thread_cpu_time() { 3859 // return user + sys since the cost is the same 3860 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3861 assert(n >= 0, "negative CPU time"); 3862 return n; 3863 } 3864 3865 jlong os::thread_cpu_time(Thread* thread) { 3866 // consistent with what current_thread_cpu_time() returns 3867 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3868 assert(n >= 0, "negative CPU time"); 3869 return n; 3870 } 3871 3872 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3873 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3874 assert(n >= 0, "negative CPU time"); 3875 return n; 3876 } 3877 3878 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3879 bool error = false; 3880 3881 jlong sys_time = 0; 3882 jlong user_time = 0; 3883 3884 // Reimplemented using getthrds64(). 3885 // 3886 // Works like this: 3887 // For the thread in question, get the kernel thread id. Then get the 3888 // kernel thread statistics using that id. 3889 // 3890 // This only works of course when no pthread scheduling is used, 3891 // i.e. there is a 1:1 relationship to kernel threads. 3892 // On AIX, see AIXTHREAD_SCOPE variable. 3893 3894 pthread_t pthtid = thread->osthread()->pthread_id(); 3895 3896 // retrieve kernel thread id for the pthread: 3897 tid64_t tid = 0; 3898 struct __pthrdsinfo pinfo; 3899 // I just love those otherworldly IBM APIs which force me to hand down 3900 // dummy buffers for stuff I dont care for... 3901 char dummy[1]; 3902 int dummy_size = sizeof(dummy); 3903 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3904 dummy, &dummy_size) == 0) { 3905 tid = pinfo.__pi_tid; 3906 } else { 3907 tty->print_cr("pthread_getthrds_np failed."); 3908 error = true; 3909 } 3910 3911 // retrieve kernel timing info for that kernel thread 3912 if (!error) { 3913 struct thrdentry64 thrdentry; 3914 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 3915 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 3916 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 3917 } else { 3918 tty->print_cr("pthread_getthrds_np failed."); 3919 error = true; 3920 } 3921 } 3922 3923 if (p_sys_time) { 3924 *p_sys_time = sys_time; 3925 } 3926 3927 if (p_user_time) { 3928 *p_user_time = user_time; 3929 } 3930 3931 if (error) { 3932 return false; 3933 } 3934 3935 return true; 3936 } 3937 3938 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3939 jlong sys_time; 3940 jlong user_time; 3941 3942 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 3943 return -1; 3944 } 3945 3946 return user_sys_cpu_time ? sys_time + user_time : user_time; 3947 } 3948 3949 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3950 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3951 info_ptr->may_skip_backward = false; // elapsed time not wall time 3952 info_ptr->may_skip_forward = false; // elapsed time not wall time 3953 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3954 } 3955 3956 void os::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 bool os::is_thread_cpu_time_supported() { 3964 return true; 3965 } 3966 3967 // System loadavg support. Returns -1 if load average cannot be obtained. 3968 // For now just return the system wide load average (no processor sets). 3969 int os::loadavg(double values[], int nelem) { 3970 3971 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 3972 guarantee(values, "argument error"); 3973 3974 if (os::Aix::on_pase()) { 3975 3976 // AS/400 PASE: use libo4 porting library 3977 double v[3] = { 0.0, 0.0, 0.0 }; 3978 3979 if (libo4::get_load_avg(v, v + 1, v + 2)) { 3980 for (int i = 0; i < nelem; i ++) { 3981 values[i] = v[i]; 3982 } 3983 return nelem; 3984 } else { 3985 return -1; 3986 } 3987 3988 } else { 3989 3990 // AIX: use libperfstat 3991 libperfstat::cpuinfo_t ci; 3992 if (libperfstat::get_cpuinfo(&ci)) { 3993 for (int i = 0; i < nelem; i++) { 3994 values[i] = ci.loadavg[i]; 3995 } 3996 } else { 3997 return -1; 3998 } 3999 return nelem; 4000 } 4001 } 4002 4003 void os::pause() { 4004 char filename[MAX_PATH]; 4005 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4006 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4007 } else { 4008 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4009 } 4010 4011 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4012 if (fd != -1) { 4013 struct stat buf; 4014 ::close(fd); 4015 while (::stat(filename, &buf) == 0) { 4016 (void)::poll(NULL, 0, 100); 4017 } 4018 } else { 4019 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4020 } 4021 } 4022 4023 bool os::is_primordial_thread(void) { 4024 if (pthread_self() == (pthread_t)1) { 4025 return true; 4026 } else { 4027 return false; 4028 } 4029 } 4030 4031 // OS recognitions (PASE/AIX, OS level) call this before calling any 4032 // one of Aix::on_pase(), Aix::os_version() static 4033 void os::Aix::initialize_os_info() { 4034 4035 assert(_on_pase == -1 && _os_version == 0, "already called."); 4036 4037 struct utsname uts; 4038 memset(&uts, 0, sizeof(uts)); 4039 strcpy(uts.sysname, "?"); 4040 if (::uname(&uts) == -1) { 4041 trcVerbose("uname failed (%d)", errno); 4042 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4043 } else { 4044 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4045 "node \"%s\" machine \"%s\"\n", 4046 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4047 const int major = atoi(uts.version); 4048 assert(major > 0, "invalid OS version"); 4049 const int minor = atoi(uts.release); 4050 assert(minor > 0, "invalid OS release"); 4051 _os_version = (major << 24) | (minor << 16); 4052 char ver_str[20] = {0}; 4053 const char* name_str = "unknown OS"; 4054 if (strcmp(uts.sysname, "OS400") == 0) { 4055 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4056 _on_pase = 1; 4057 if (os_version_short() < 0x0504) { 4058 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4059 assert(false, "OS/400 release too old."); 4060 } 4061 name_str = "OS/400 (pase)"; 4062 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4063 } else if (strcmp(uts.sysname, "AIX") == 0) { 4064 // We run on AIX. We do not support versions older than AIX 7.1. 4065 _on_pase = 0; 4066 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4067 odmWrapper::determine_os_kernel_version(&_os_version); 4068 if (os_version_short() < 0x0701) { 4069 trcVerbose("AIX releases older than AIX 7.1 are not supported."); 4070 assert(false, "AIX release too old."); 4071 } 4072 name_str = "AIX"; 4073 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4074 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4075 } else { 4076 assert(false, "%s", name_str); 4077 } 4078 trcVerbose("We run on %s %s", name_str, ver_str); 4079 } 4080 4081 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4082 } // end: os::Aix::initialize_os_info() 4083 4084 // Scan environment for important settings which might effect the VM. 4085 // Trace out settings. Warn about invalid settings and/or correct them. 4086 // 4087 // Must run after os::Aix::initialue_os_info(). 4088 void os::Aix::scan_environment() { 4089 4090 char* p; 4091 int rc; 4092 4093 // Warn explicity if EXTSHM=ON is used. That switch changes how 4094 // System V shared memory behaves. One effect is that page size of 4095 // shared memory cannot be change dynamically, effectivly preventing 4096 // large pages from working. 4097 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4098 // recommendation is (in OSS notes) to switch it off. 4099 p = ::getenv("EXTSHM"); 4100 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4101 if (p && strcasecmp(p, "ON") == 0) { 4102 _extshm = 1; 4103 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4104 if (!AllowExtshm) { 4105 // We allow under certain conditions the user to continue. However, we want this 4106 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4107 // that the VM is not able to allocate 64k pages for the heap. 4108 // We do not want to run with reduced performance. 4109 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4110 } 4111 } else { 4112 _extshm = 0; 4113 } 4114 4115 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4116 // Not tested, not supported. 4117 // 4118 // Note that it might be worth the trouble to test and to require it, if only to 4119 // get useful return codes for mprotect. 4120 // 4121 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4122 // exec() ? before loading the libjvm ? ....) 4123 p = ::getenv("XPG_SUS_ENV"); 4124 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4125 if (p && strcmp(p, "ON") == 0) { 4126 _xpg_sus_mode = 1; 4127 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4128 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4129 // clobber address ranges. If we ever want to support that, we have to do some 4130 // testing first. 4131 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4132 } else { 4133 _xpg_sus_mode = 0; 4134 } 4135 4136 if (os::Aix::on_pase()) { 4137 p = ::getenv("QIBM_MULTI_THREADED"); 4138 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4139 } 4140 4141 p = ::getenv("LDR_CNTRL"); 4142 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4143 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4144 if (p && ::strstr(p, "TEXTPSIZE")) { 4145 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4146 "you may experience hangs or crashes on OS/400 V7R1."); 4147 } 4148 } 4149 4150 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4151 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4152 4153 } // end: os::Aix::scan_environment() 4154 4155 // PASE: initialize the libo4 library (PASE porting library). 4156 void os::Aix::initialize_libo4() { 4157 guarantee(os::Aix::on_pase(), "OS/400 only."); 4158 if (!libo4::init()) { 4159 trcVerbose("libo4 initialization failed."); 4160 assert(false, "libo4 initialization failed"); 4161 } else { 4162 trcVerbose("libo4 initialized."); 4163 } 4164 } 4165 4166 // AIX: initialize the libperfstat library. 4167 void os::Aix::initialize_libperfstat() { 4168 assert(os::Aix::on_aix(), "AIX only"); 4169 if (!libperfstat::init()) { 4170 trcVerbose("libperfstat initialization failed."); 4171 assert(false, "libperfstat initialization failed"); 4172 } else { 4173 trcVerbose("libperfstat initialized."); 4174 } 4175 } 4176 4177 ///////////////////////////////////////////////////////////////////////////// 4178 // thread stack 4179 4180 // Get the current stack base from the OS (actually, the pthread library). 4181 // Note: usually not page aligned. 4182 address os::current_stack_base() { 4183 AixMisc::stackbounds_t bounds; 4184 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4185 guarantee(rc, "Unable to retrieve stack bounds."); 4186 return bounds.base; 4187 } 4188 4189 // Get the current stack size from the OS (actually, the pthread library). 4190 // Returned size is such that (base - size) is always aligned to page size. 4191 size_t os::current_stack_size() { 4192 AixMisc::stackbounds_t bounds; 4193 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4194 guarantee(rc, "Unable to retrieve stack bounds."); 4195 // Align the returned stack size such that the stack low address 4196 // is aligned to page size (Note: base is usually not and we do not care). 4197 // We need to do this because caller code will assume stack low address is 4198 // page aligned and will place guard pages without checking. 4199 address low = bounds.base - bounds.size; 4200 address low_aligned = (address)align_up(low, os::vm_page_size()); 4201 size_t s = bounds.base - low_aligned; 4202 return s; 4203 } 4204 4205 extern char** environ; 4206 4207 // Run the specified command in a separate process. Return its exit value, 4208 // or -1 on failure (e.g. can't fork a new process). 4209 // Unlike system(), this function can be called from signal handler. It 4210 // doesn't block SIGINT et al. 4211 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 4212 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL}; 4213 4214 pid_t pid = fork(); 4215 4216 if (pid < 0) { 4217 // fork failed 4218 return -1; 4219 4220 } else if (pid == 0) { 4221 // child process 4222 4223 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4224 execve("/usr/bin/sh", argv, environ); 4225 4226 // execve failed 4227 _exit(-1); 4228 4229 } else { 4230 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4231 // care about the actual exit code, for now. 4232 4233 int status; 4234 4235 // Wait for the child process to exit. This returns immediately if 4236 // the child has already exited. */ 4237 while (waitpid(pid, &status, 0) < 0) { 4238 switch (errno) { 4239 case ECHILD: return 0; 4240 case EINTR: break; 4241 default: return -1; 4242 } 4243 } 4244 4245 if (WIFEXITED(status)) { 4246 // The child exited normally; get its exit code. 4247 return WEXITSTATUS(status); 4248 } else if (WIFSIGNALED(status)) { 4249 // The child exited because of a signal. 4250 // The best value to return is 0x80 + signal number, 4251 // because that is what all Unix shells do, and because 4252 // it allows callers to distinguish between process exit and 4253 // process death by signal. 4254 return 0x80 + WTERMSIG(status); 4255 } else { 4256 // Unknown exit code; pass it through. 4257 return status; 4258 } 4259 } 4260 return -1; 4261 } 4262 4263 // Get the default path to the core file 4264 // Returns the length of the string 4265 int os::get_core_path(char* buffer, size_t bufferSize) { 4266 const char* p = get_current_directory(buffer, bufferSize); 4267 4268 if (p == NULL) { 4269 assert(p != NULL, "failed to get current directory"); 4270 return 0; 4271 } 4272 4273 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4274 p, current_process_id()); 4275 4276 return strlen(buffer); 4277 } 4278 4279 #ifndef PRODUCT 4280 void TestReserveMemorySpecial_test() { 4281 // No tests available for this platform 4282 } 4283 #endif 4284 4285 bool os::start_debugging(char *buf, int buflen) { 4286 int len = (int)strlen(buf); 4287 char *p = &buf[len]; 4288 4289 jio_snprintf(p, buflen -len, 4290 "\n\n" 4291 "Do you want to debug the problem?\n\n" 4292 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4293 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4294 "Otherwise, press RETURN to abort...", 4295 os::current_process_id(), 4296 os::current_thread_id(), thread_self()); 4297 4298 bool yes = os::message_box("Unexpected Error", buf); 4299 4300 if (yes) { 4301 // yes, user asked VM to launch debugger 4302 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4303 4304 os::fork_and_exec(buf); 4305 yes = false; 4306 } 4307 return yes; 4308 } 4309 4310 static inline time_t get_mtime(const char* filename) { 4311 struct stat st; 4312 int ret = os::stat(filename, &st); 4313 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 4314 return st.st_mtime; 4315 } 4316 4317 int os::compare_file_modified_times(const char* file1, const char* file2) { 4318 time_t t1 = get_mtime(file1); 4319 time_t t2 = get_mtime(file2); 4320 return t1 - t2; 4321 } 4322 4323 bool os::supports_map_sync() { 4324 return false; 4325 }