1 /* 2 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2020 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/globals.hpp" 57 #include "runtime/interfaceSupport.inline.hpp" 58 #include "runtime/java.hpp" 59 #include "runtime/javaCalls.hpp" 60 #include "runtime/mutexLocker.hpp" 61 #include "runtime/objectMonitor.hpp" 62 #include "runtime/os.hpp" 63 #include "runtime/osThread.hpp" 64 #include "runtime/perfMemory.hpp" 65 #include "runtime/sharedRuntime.hpp" 66 #include "runtime/statSampler.hpp" 67 #include "runtime/stubRoutines.hpp" 68 #include "runtime/thread.inline.hpp" 69 #include "runtime/threadCritical.hpp" 70 #include "runtime/timer.hpp" 71 #include "runtime/vm_version.hpp" 72 #include "services/attachListener.hpp" 73 #include "services/runtimeService.hpp" 74 #include "utilities/align.hpp" 75 #include "utilities/decoder.hpp" 76 #include "utilities/defaultStream.hpp" 77 #include "utilities/events.hpp" 78 #include "utilities/growableArray.hpp" 79 #include "utilities/vmError.hpp" 80 81 // put OS-includes here (sorted alphabetically) 82 #include <errno.h> 83 #include <fcntl.h> 84 #include <inttypes.h> 85 #include <poll.h> 86 #include <procinfo.h> 87 #include <pthread.h> 88 #include <pwd.h> 89 #include <semaphore.h> 90 #include <signal.h> 91 #include <stdint.h> 92 #include <stdio.h> 93 #include <string.h> 94 #include <unistd.h> 95 #include <sys/ioctl.h> 96 #include <sys/ipc.h> 97 #include <sys/mman.h> 98 #include <sys/resource.h> 99 #include <sys/select.h> 100 #include <sys/shm.h> 101 #include <sys/socket.h> 102 #include <sys/stat.h> 103 #include <sys/sysinfo.h> 104 #include <sys/systemcfg.h> 105 #include <sys/time.h> 106 #include <sys/times.h> 107 #include <sys/types.h> 108 #include <sys/utsname.h> 109 #include <sys/vminfo.h> 110 #include <sys/wait.h> 111 112 // Missing prototypes for various system APIs. 113 extern "C" 114 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); 115 116 #if !defined(_AIXVERSION_610) 117 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int); 118 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int); 119 extern "C" int getargs(procsinfo*, int, char*, int); 120 #endif 121 122 #define MAX_PATH (2 * K) 123 124 // for timer info max values which include all bits 125 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 126 // for multipage initialization error analysis (in 'g_multipage_error') 127 #define ERROR_MP_OS_TOO_OLD 100 128 #define ERROR_MP_EXTSHM_ACTIVE 101 129 #define ERROR_MP_VMGETINFO_FAILED 102 130 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 131 132 // excerpts from systemcfg.h that might be missing on older os levels 133 #ifndef PV_7 134 #define PV_7 0x200000 /* Power PC 7 */ 135 #endif 136 #ifndef PV_7_Compat 137 #define PV_7_Compat 0x208000 /* Power PC 7 */ 138 #endif 139 #ifndef PV_8 140 #define PV_8 0x300000 /* Power PC 8 */ 141 #endif 142 #ifndef PV_8_Compat 143 #define PV_8_Compat 0x308000 /* Power PC 8 */ 144 #endif 145 #ifndef PV_9 146 #define PV_9 0x400000 /* Power PC 9 */ 147 #endif 148 #ifndef PV_9_Compat 149 #define PV_9_Compat 0x408000 /* Power PC 9 */ 150 #endif 151 152 153 static address resolve_function_descriptor_to_code_pointer(address p); 154 155 static void vmembk_print_on(outputStream* os); 156 157 //////////////////////////////////////////////////////////////////////////////// 158 // global variables (for a description see os_aix.hpp) 159 160 julong os::Aix::_physical_memory = 0; 161 162 pthread_t os::Aix::_main_thread = ((pthread_t)0); 163 int os::Aix::_page_size = -1; 164 165 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase 166 int os::Aix::_on_pase = -1; 167 168 // 0 = uninitialized, otherwise 32 bit number: 169 // 0xVVRRTTSS 170 // VV - major version 171 // RR - minor version 172 // TT - tech level, if known, 0 otherwise 173 // SS - service pack, if known, 0 otherwise 174 uint32_t os::Aix::_os_version = 0; 175 176 // -1 = uninitialized, 0 - no, 1 - yes 177 int os::Aix::_xpg_sus_mode = -1; 178 179 // -1 = uninitialized, 0 - no, 1 - yes 180 int os::Aix::_extshm = -1; 181 182 //////////////////////////////////////////////////////////////////////////////// 183 // local variables 184 185 static volatile jlong max_real_time = 0; 186 static jlong initial_time_count = 0; 187 static int clock_tics_per_sec = 100; 188 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) 189 static bool check_signals = true; 190 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) 191 static sigset_t SR_sigset; 192 193 // Process break recorded at startup. 194 static address g_brk_at_startup = NULL; 195 196 // This describes the state of multipage support of the underlying 197 // OS. Note that this is of no interest to the outsize world and 198 // therefore should not be defined in AIX class. 199 // 200 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The 201 // latter two (16M "large" resp. 16G "huge" pages) require special 202 // setup and are normally not available. 203 // 204 // AIX supports multiple page sizes per process, for: 205 // - Stack (of the primordial thread, so not relevant for us) 206 // - Data - data, bss, heap, for us also pthread stacks 207 // - Text - text code 208 // - shared memory 209 // 210 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) 211 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...). 212 // 213 // For shared memory, page size can be set dynamically via 214 // shmctl(). Different shared memory regions can have different page 215 // sizes. 216 // 217 // More information can be found at AIBM info center: 218 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm 219 // 220 static struct { 221 size_t pagesize; // sysconf _SC_PAGESIZE (4K) 222 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE) 223 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE) 224 size_t pthr_stack_pagesize; // stack page size of pthread threads 225 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE) 226 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm. 227 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm. 228 int error; // Error describing if something went wrong at multipage init. 229 } g_multipage_support = { 230 (size_t) -1, 231 (size_t) -1, 232 (size_t) -1, 233 (size_t) -1, 234 (size_t) -1, 235 false, false, 236 0 237 }; 238 239 // We must not accidentally allocate memory close to the BRK - even if 240 // that would work - because then we prevent the BRK segment from 241 // growing which may result in a malloc OOM even though there is 242 // enough memory. The problem only arises if we shmat() or mmap() at 243 // a specific wish address, e.g. to place the heap in a 244 // compressed-oops-friendly way. 245 static bool is_close_to_brk(address a) { 246 assert0(g_brk_at_startup != NULL); 247 if (a >= g_brk_at_startup && 248 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) { 249 return true; 250 } 251 return false; 252 } 253 254 julong os::available_memory() { 255 return Aix::available_memory(); 256 } 257 258 julong os::Aix::available_memory() { 259 // Avoid expensive API call here, as returned value will always be null. 260 if (os::Aix::on_pase()) { 261 return 0x0LL; 262 } 263 os::Aix::meminfo_t mi; 264 if (os::Aix::get_meminfo(&mi)) { 265 return mi.real_free; 266 } else { 267 return ULONG_MAX; 268 } 269 } 270 271 julong os::physical_memory() { 272 return Aix::physical_memory(); 273 } 274 275 // Return true if user is running as root. 276 277 bool os::have_special_privileges() { 278 static bool init = false; 279 static bool privileges = false; 280 if (!init) { 281 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 282 init = true; 283 } 284 return privileges; 285 } 286 287 // Helper function, emulates disclaim64 using multiple 32bit disclaims 288 // because we cannot use disclaim64() on AS/400 and old AIX releases. 289 static bool my_disclaim64(char* addr, size_t size) { 290 291 if (size == 0) { 292 return true; 293 } 294 295 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) 296 const unsigned int maxDisclaimSize = 0x40000000; 297 298 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); 299 const unsigned int lastDisclaimSize = (size % maxDisclaimSize); 300 301 char* p = addr; 302 303 for (int i = 0; i < numFullDisclaimsNeeded; i ++) { 304 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 305 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); 306 return false; 307 } 308 p += maxDisclaimSize; 309 } 310 311 if (lastDisclaimSize > 0) { 312 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 313 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); 314 return false; 315 } 316 } 317 318 return true; 319 } 320 321 // Cpu architecture string 322 #if defined(PPC32) 323 static char cpu_arch[] = "ppc"; 324 #elif defined(PPC64) 325 static char cpu_arch[] = "ppc64"; 326 #else 327 #error Add appropriate cpu_arch setting 328 #endif 329 330 // Wrap the function "vmgetinfo" which is not available on older OS releases. 331 static int checked_vmgetinfo(void *out, int command, int arg) { 332 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 333 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1"); 334 } 335 return ::vmgetinfo(out, command, arg); 336 } 337 338 // Given an address, returns the size of the page backing that address. 339 size_t os::Aix::query_pagesize(void* addr) { 340 341 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 342 // AS/400 older than V6R1: no vmgetinfo here, default to 4K 343 return 4*K; 344 } 345 346 vm_page_info pi; 347 pi.addr = (uint64_t)addr; 348 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { 349 return pi.pagesize; 350 } else { 351 assert(false, "vmgetinfo failed to retrieve page size"); 352 return 4*K; 353 } 354 } 355 356 void os::Aix::initialize_system_info() { 357 358 // Get the number of online(logical) cpus instead of configured. 359 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); 360 assert(_processor_count > 0, "_processor_count must be > 0"); 361 362 // Retrieve total physical storage. 363 os::Aix::meminfo_t mi; 364 if (!os::Aix::get_meminfo(&mi)) { 365 assert(false, "os::Aix::get_meminfo failed."); 366 } 367 _physical_memory = (julong) mi.real_total; 368 } 369 370 // Helper function for tracing page sizes. 371 static const char* describe_pagesize(size_t pagesize) { 372 switch (pagesize) { 373 case 4*K : return "4K"; 374 case 64*K: return "64K"; 375 case 16*M: return "16M"; 376 case 16*G: return "16G"; 377 default: 378 assert(false, "surprise"); 379 return "??"; 380 } 381 } 382 383 // Probe OS for multipage support. 384 // Will fill the global g_multipage_support structure. 385 // Must be called before calling os::large_page_init(). 386 static void query_multipage_support() { 387 388 guarantee(g_multipage_support.pagesize == -1, 389 "do not call twice"); 390 391 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE); 392 393 // This really would surprise me. 394 assert(g_multipage_support.pagesize == 4*K, "surprise!"); 395 396 // Query default data page size (default page size for C-Heap, pthread stacks and .bss). 397 // Default data page size is defined either by linker options (-bdatapsize) 398 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, 399 // default should be 4K. 400 { 401 void* p = ::malloc(16*M); 402 g_multipage_support.datapsize = os::Aix::query_pagesize(p); 403 ::free(p); 404 } 405 406 // Query default shm page size (LDR_CNTRL SHMPSIZE). 407 // Note that this is pure curiosity. We do not rely on default page size but set 408 // our own page size after allocated. 409 { 410 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); 411 guarantee(shmid != -1, "shmget failed"); 412 void* p = ::shmat(shmid, NULL, 0); 413 ::shmctl(shmid, IPC_RMID, NULL); 414 guarantee(p != (void*) -1, "shmat failed"); 415 g_multipage_support.shmpsize = os::Aix::query_pagesize(p); 416 ::shmdt(p); 417 } 418 419 // Before querying the stack page size, make sure we are not running as primordial 420 // thread (because primordial thread's stack may have different page size than 421 // pthread thread stacks). Running a VM on the primordial thread won't work for a 422 // number of reasons so we may just as well guarantee it here. 423 guarantee0(!os::is_primordial_thread()); 424 425 // Query pthread stack page size. Should be the same as data page size because 426 // pthread stacks are allocated from C-Heap. 427 { 428 int dummy = 0; 429 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy); 430 } 431 432 // Query default text page size (LDR_CNTRL TEXTPSIZE). 433 { 434 address any_function = 435 resolve_function_descriptor_to_code_pointer((address)describe_pagesize); 436 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function); 437 } 438 439 // Now probe for support of 64K pages and 16M pages. 440 441 // Before OS/400 V6R1, there is no support for pages other than 4K. 442 if (os::Aix::on_pase_V5R4_or_older()) { 443 trcVerbose("OS/400 < V6R1 - no large page support."); 444 g_multipage_support.error = ERROR_MP_OS_TOO_OLD; 445 goto query_multipage_support_end; 446 } 447 448 // Now check which page sizes the OS claims it supports, and of those, which actually can be used. 449 { 450 const int MAX_PAGE_SIZES = 4; 451 psize_t sizes[MAX_PAGE_SIZES]; 452 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); 453 if (num_psizes == -1) { 454 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno); 455 trcVerbose("disabling multipage support."); 456 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED; 457 goto query_multipage_support_end; 458 } 459 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); 460 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); 461 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); 462 for (int i = 0; i < num_psizes; i ++) { 463 trcVerbose(" %s ", describe_pagesize(sizes[i])); 464 } 465 466 // Can we use 64K, 16M pages? 467 for (int i = 0; i < num_psizes; i ++) { 468 const size_t pagesize = sizes[i]; 469 if (pagesize != 64*K && pagesize != 16*M) { 470 continue; 471 } 472 bool can_use = false; 473 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize)); 474 const int shmid = ::shmget(IPC_PRIVATE, pagesize, 475 IPC_CREAT | S_IRUSR | S_IWUSR); 476 guarantee0(shmid != -1); // Should always work. 477 // Try to set pagesize. 478 struct shmid_ds shm_buf = { 0 }; 479 shm_buf.shm_pagesize = pagesize; 480 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) { 481 const int en = errno; 482 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 483 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno); 484 } else { 485 // Attach and double check pageisze. 486 void* p = ::shmat(shmid, NULL, 0); 487 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 488 guarantee0(p != (void*) -1); // Should always work. 489 const size_t real_pagesize = os::Aix::query_pagesize(p); 490 if (real_pagesize != pagesize) { 491 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize); 492 } else { 493 can_use = true; 494 } 495 ::shmdt(p); 496 } 497 trcVerbose("Can use: %s", (can_use ? "yes" : "no")); 498 if (pagesize == 64*K) { 499 g_multipage_support.can_use_64K_pages = can_use; 500 } else if (pagesize == 16*M) { 501 g_multipage_support.can_use_16M_pages = can_use; 502 } 503 } 504 505 } // end: check which pages can be used for shared memory 506 507 query_multipage_support_end: 508 509 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s", 510 describe_pagesize(g_multipage_support.pagesize)); 511 trcVerbose("Data page size (C-Heap, bss, etc): %s", 512 describe_pagesize(g_multipage_support.datapsize)); 513 trcVerbose("Text page size: %s", 514 describe_pagesize(g_multipage_support.textpsize)); 515 trcVerbose("Thread stack page size (pthread): %s", 516 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 517 trcVerbose("Default shared memory page size: %s", 518 describe_pagesize(g_multipage_support.shmpsize)); 519 trcVerbose("Can use 64K pages dynamically with shared memory: %s", 520 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 521 trcVerbose("Can use 16M pages dynamically with shared memory: %s", 522 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 523 trcVerbose("Multipage error details: %d", 524 g_multipage_support.error); 525 526 // sanity checks 527 assert0(g_multipage_support.pagesize == 4*K); 528 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K); 529 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K); 530 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize); 531 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K); 532 533 } 534 535 void os::init_system_properties_values() { 536 537 #ifndef OVERRIDE_LIBPATH 538 #define DEFAULT_LIBPATH "/lib:/usr/lib" 539 #else 540 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH 541 #endif 542 #define EXTENSIONS_DIR "/lib/ext" 543 544 // Buffer that fits several sprintfs. 545 // Note that the space for the trailing null is provided 546 // by the nulls included by the sizeof operator. 547 const size_t bufsize = 548 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 549 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir 550 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 551 552 // sysclasspath, java_home, dll_dir 553 { 554 char *pslash; 555 os::jvm_path(buf, bufsize); 556 557 // Found the full path to libjvm.so. 558 // Now cut the path to <java_home>/jre if we can. 559 pslash = strrchr(buf, '/'); 560 if (pslash != NULL) { 561 *pslash = '\0'; // Get rid of /libjvm.so. 562 } 563 pslash = strrchr(buf, '/'); 564 if (pslash != NULL) { 565 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 566 } 567 Arguments::set_dll_dir(buf); 568 569 if (pslash != NULL) { 570 pslash = strrchr(buf, '/'); 571 if (pslash != NULL) { 572 *pslash = '\0'; // Get rid of /lib. 573 } 574 } 575 Arguments::set_java_home(buf); 576 if (!set_boot_path('/', ':')) { 577 vm_exit_during_initialization("Failed setting boot class path.", NULL); 578 } 579 } 580 581 // Where to look for native libraries. 582 583 // On Aix we get the user setting of LIBPATH. 584 // Eventually, all the library path setting will be done here. 585 // Get the user setting of LIBPATH. 586 const char *v = ::getenv("LIBPATH"); 587 const char *v_colon = ":"; 588 if (v == NULL) { v = ""; v_colon = ""; } 589 590 // Concatenate user and invariant part of ld_library_path. 591 // That's +1 for the colon and +1 for the trailing '\0'. 592 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal); 593 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon); 594 Arguments::set_library_path(ld_library_path); 595 FREE_C_HEAP_ARRAY(char, ld_library_path); 596 597 // Extensions directories. 598 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); 599 Arguments::set_ext_dirs(buf); 600 601 FREE_C_HEAP_ARRAY(char, buf); 602 603 #undef DEFAULT_LIBPATH 604 #undef EXTENSIONS_DIR 605 } 606 607 //////////////////////////////////////////////////////////////////////////////// 608 // breakpoint support 609 610 void os::breakpoint() { 611 BREAKPOINT; 612 } 613 614 extern "C" void breakpoint() { 615 // use debugger to set breakpoint here 616 } 617 618 //////////////////////////////////////////////////////////////////////////////// 619 // signal support 620 621 debug_only(static bool signal_sets_initialized = false); 622 static sigset_t unblocked_sigs, vm_sigs; 623 624 void os::Aix::signal_sets_init() { 625 // Should also have an assertion stating we are still single-threaded. 626 assert(!signal_sets_initialized, "Already initialized"); 627 // Fill in signals that are necessarily unblocked for all threads in 628 // the VM. Currently, we unblock the following signals: 629 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 630 // by -Xrs (=ReduceSignalUsage)); 631 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 632 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 633 // the dispositions or masks wrt these signals. 634 // Programs embedding the VM that want to use the above signals for their 635 // own purposes must, at this time, use the "-Xrs" option to prevent 636 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 637 // (See bug 4345157, and other related bugs). 638 // In reality, though, unblocking these signals is really a nop, since 639 // these signals are not blocked by default. 640 sigemptyset(&unblocked_sigs); 641 sigaddset(&unblocked_sigs, SIGILL); 642 sigaddset(&unblocked_sigs, SIGSEGV); 643 sigaddset(&unblocked_sigs, SIGBUS); 644 sigaddset(&unblocked_sigs, SIGFPE); 645 sigaddset(&unblocked_sigs, SIGTRAP); 646 sigaddset(&unblocked_sigs, SR_signum); 647 648 if (!ReduceSignalUsage) { 649 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 650 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 651 } 652 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 653 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 654 } 655 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 656 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 657 } 658 } 659 // Fill in signals that are blocked by all but the VM thread. 660 sigemptyset(&vm_sigs); 661 if (!ReduceSignalUsage) 662 sigaddset(&vm_sigs, BREAK_SIGNAL); 663 debug_only(signal_sets_initialized = true); 664 } 665 666 // These are signals that are unblocked while a thread is running Java. 667 // (For some reason, they get blocked by default.) 668 sigset_t* os::Aix::unblocked_signals() { 669 assert(signal_sets_initialized, "Not initialized"); 670 return &unblocked_sigs; 671 } 672 673 // These are the signals that are blocked while a (non-VM) thread is 674 // running Java. Only the VM thread handles these signals. 675 sigset_t* os::Aix::vm_signals() { 676 assert(signal_sets_initialized, "Not initialized"); 677 return &vm_sigs; 678 } 679 680 void os::Aix::hotspot_sigmask(Thread* thread) { 681 682 //Save caller's signal mask before setting VM signal mask 683 sigset_t caller_sigmask; 684 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 685 686 OSThread* osthread = thread->osthread(); 687 osthread->set_caller_sigmask(caller_sigmask); 688 689 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); 690 691 if (!ReduceSignalUsage) { 692 if (thread->is_VM_thread()) { 693 // Only the VM thread handles BREAK_SIGNAL ... 694 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 695 } else { 696 // ... all other threads block BREAK_SIGNAL 697 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 698 } 699 } 700 } 701 702 // retrieve memory information. 703 // Returns false if something went wrong; 704 // content of pmi undefined in this case. 705 bool os::Aix::get_meminfo(meminfo_t* pmi) { 706 707 assert(pmi, "get_meminfo: invalid parameter"); 708 709 memset(pmi, 0, sizeof(meminfo_t)); 710 711 if (os::Aix::on_pase()) { 712 // On PASE, use the libo4 porting library. 713 714 unsigned long long virt_total = 0; 715 unsigned long long real_total = 0; 716 unsigned long long real_free = 0; 717 unsigned long long pgsp_total = 0; 718 unsigned long long pgsp_free = 0; 719 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) { 720 pmi->virt_total = virt_total; 721 pmi->real_total = real_total; 722 pmi->real_free = real_free; 723 pmi->pgsp_total = pgsp_total; 724 pmi->pgsp_free = pgsp_free; 725 return true; 726 } 727 return false; 728 729 } else { 730 731 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics 732 // See: 733 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 734 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm 735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 736 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 737 738 perfstat_memory_total_t psmt; 739 memset (&psmt, '\0', sizeof(psmt)); 740 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); 741 if (rc == -1) { 742 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno); 743 assert(0, "perfstat_memory_total() failed"); 744 return false; 745 } 746 747 assert(rc == 1, "perfstat_memory_total() - weird return code"); 748 749 // excerpt from 750 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 751 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 752 // The fields of perfstat_memory_total_t: 753 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). 754 // u_longlong_t real_total Total real memory (in 4 KB pages). 755 // u_longlong_t real_free Free real memory (in 4 KB pages). 756 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). 757 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). 758 759 pmi->virt_total = psmt.virt_total * 4096; 760 pmi->real_total = psmt.real_total * 4096; 761 pmi->real_free = psmt.real_free * 4096; 762 pmi->pgsp_total = psmt.pgsp_total * 4096; 763 pmi->pgsp_free = psmt.pgsp_free * 4096; 764 765 return true; 766 767 } 768 } // end os::Aix::get_meminfo 769 770 ////////////////////////////////////////////////////////////////////////////// 771 // create new thread 772 773 // Thread start routine for all newly created threads 774 static void *thread_native_entry(Thread *thread) { 775 776 thread->record_stack_base_and_size(); 777 778 const pthread_t pthread_id = ::pthread_self(); 779 const tid_t kernel_thread_id = ::thread_self(); 780 781 LogTarget(Info, os, thread) lt; 782 if (lt.is_enabled()) { 783 address low_address = thread->stack_end(); 784 address high_address = thread->stack_base(); 785 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT 786 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).", 787 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address, 788 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); 789 } 790 791 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() 792 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party 793 // tools hook pthread_create(). In this case, we may run into problems establishing 794 // guard pages on those stacks, because the stacks may reside in memory which is not 795 // protectable (shmated). 796 if (thread->stack_base() > ::sbrk(0)) { 797 log_warning(os, thread)("Thread stack not in data segment."); 798 } 799 800 // Try to randomize the cache line index of hot stack frames. 801 // This helps when threads of the same stack traces evict each other's 802 // cache lines. The threads can be either from the same JVM instance, or 803 // from different JVM instances. The benefit is especially true for 804 // processors with hyperthreading technology. 805 806 static int counter = 0; 807 int pid = os::current_process_id(); 808 alloca(((pid ^ counter++) & 7) * 128); 809 810 thread->initialize_thread_current(); 811 812 OSThread* osthread = thread->osthread(); 813 814 // Thread_id is pthread id. 815 osthread->set_thread_id(pthread_id); 816 817 // .. but keep kernel thread id too for diagnostics 818 osthread->set_kernel_thread_id(kernel_thread_id); 819 820 // Initialize signal mask for this thread. 821 os::Aix::hotspot_sigmask(thread); 822 823 // Initialize floating point control register. 824 os::Aix::init_thread_fpu_state(); 825 826 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); 827 828 // Call one more level start routine. 829 thread->call_run(); 830 831 // Note: at this point the thread object may already have deleted itself. 832 // Prevent dereferencing it from here on out. 833 thread = NULL; 834 835 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 836 os::current_thread_id(), (uintx) kernel_thread_id); 837 838 return 0; 839 } 840 841 bool os::create_thread(Thread* thread, ThreadType thr_type, 842 size_t req_stack_size) { 843 844 assert(thread->osthread() == NULL, "caller responsible"); 845 846 // Allocate the OSThread object. 847 OSThread* osthread = new OSThread(NULL, NULL); 848 if (osthread == NULL) { 849 return false; 850 } 851 852 // Set the correct thread state. 853 osthread->set_thread_type(thr_type); 854 855 // Initial state is ALLOCATED but not INITIALIZED 856 osthread->set_state(ALLOCATED); 857 858 thread->set_osthread(osthread); 859 860 // Init thread attributes. 861 pthread_attr_t attr; 862 pthread_attr_init(&attr); 863 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); 864 865 // Make sure we run in 1:1 kernel-user-thread mode. 866 if (os::Aix::on_aix()) { 867 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); 868 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); 869 } 870 871 // Start in suspended state, and in os::thread_start, wake the thread up. 872 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); 873 874 // Calculate stack size if it's not specified by caller. 875 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 876 877 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) 878 // the real thread stack size may be smaller than the requested stack size, by as much as 64K. 879 // This very much looks like a pthread lib error. As a workaround, increase the stack size 880 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB) 881 if (stack_size < 4096 * K) { 882 stack_size += 64 * K; 883 } 884 885 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the 886 // thread size in attr unchanged. If this is the minimal stack size as set 887 // by pthread_attr_init this leads to crashes after thread creation. E.g. the 888 // guard pages might not fit on the tiny stack created. 889 int ret = pthread_attr_setstacksize(&attr, stack_size); 890 if (ret != 0) { 891 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k", 892 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "), 893 stack_size / K); 894 thread->set_osthread(NULL); 895 delete osthread; 896 return false; 897 } 898 899 // Save some cycles and a page by disabling OS guard pages where we have our own 900 // VM guard pages (in java threads). For other threads, keep system default guard 901 // pages in place. 902 if (thr_type == java_thread || thr_type == compiler_thread) { 903 ret = pthread_attr_setguardsize(&attr, 0); 904 } 905 906 pthread_t tid = 0; 907 if (ret == 0) { 908 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 909 } 910 911 if (ret == 0) { 912 char buf[64]; 913 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 914 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 915 } else { 916 char buf[64]; 917 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.", 918 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 919 // Log some OS information which might explain why creating the thread failed. 920 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 921 LogStream st(Log(os, thread)::info()); 922 os::Posix::print_rlimit_info(&st); 923 os::print_memory_info(&st); 924 } 925 926 pthread_attr_destroy(&attr); 927 928 if (ret != 0) { 929 // Need to clean up stuff we've allocated so far. 930 thread->set_osthread(NULL); 931 delete osthread; 932 return false; 933 } 934 935 // OSThread::thread_id is the pthread id. 936 osthread->set_thread_id(tid); 937 938 return true; 939 } 940 941 ///////////////////////////////////////////////////////////////////////////// 942 // attach existing thread 943 944 // bootstrap the main thread 945 bool os::create_main_thread(JavaThread* thread) { 946 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); 947 return create_attached_thread(thread); 948 } 949 950 bool os::create_attached_thread(JavaThread* thread) { 951 #ifdef ASSERT 952 thread->verify_not_published(); 953 #endif 954 955 // Allocate the OSThread object 956 OSThread* osthread = new OSThread(NULL, NULL); 957 958 if (osthread == NULL) { 959 return false; 960 } 961 962 const pthread_t pthread_id = ::pthread_self(); 963 const tid_t kernel_thread_id = ::thread_self(); 964 965 // OSThread::thread_id is the pthread id. 966 osthread->set_thread_id(pthread_id); 967 968 // .. but keep kernel thread id too for diagnostics 969 osthread->set_kernel_thread_id(kernel_thread_id); 970 971 // initialize floating point control register 972 os::Aix::init_thread_fpu_state(); 973 974 // Initial thread state is RUNNABLE 975 osthread->set_state(RUNNABLE); 976 977 thread->set_osthread(osthread); 978 979 if (UseNUMA) { 980 int lgrp_id = os::numa_get_group_id(); 981 if (lgrp_id != -1) { 982 thread->set_lgrp_id(lgrp_id); 983 } 984 } 985 986 // initialize signal mask for this thread 987 // and save the caller's signal mask 988 os::Aix::hotspot_sigmask(thread); 989 990 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 991 os::current_thread_id(), (uintx) kernel_thread_id); 992 993 return true; 994 } 995 996 void os::pd_start_thread(Thread* thread) { 997 int status = pthread_continue_np(thread->osthread()->pthread_id()); 998 assert(status == 0, "thr_continue failed"); 999 } 1000 1001 // Free OS resources related to the OSThread 1002 void os::free_thread(OSThread* osthread) { 1003 assert(osthread != NULL, "osthread not set"); 1004 1005 // We are told to free resources of the argument thread, 1006 // but we can only really operate on the current thread. 1007 assert(Thread::current()->osthread() == osthread, 1008 "os::free_thread but not current thread"); 1009 1010 // Restore caller's signal mask 1011 sigset_t sigmask = osthread->caller_sigmask(); 1012 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1013 1014 delete osthread; 1015 } 1016 1017 //////////////////////////////////////////////////////////////////////////////// 1018 // time support 1019 1020 // Time since start-up in seconds to a fine granularity. 1021 // Used by VMSelfDestructTimer and the MemProfiler. 1022 double os::elapsedTime() { 1023 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution 1024 } 1025 1026 jlong os::elapsed_counter() { 1027 return javaTimeNanos() - initial_time_count; 1028 } 1029 1030 jlong os::elapsed_frequency() { 1031 return NANOSECS_PER_SEC; // nanosecond resolution 1032 } 1033 1034 bool os::supports_vtime() { return true; } 1035 1036 double os::elapsedVTime() { 1037 struct rusage usage; 1038 int retval = getrusage(RUSAGE_THREAD, &usage); 1039 if (retval == 0) { 1040 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1041 } else { 1042 // better than nothing, but not much 1043 return elapsedTime(); 1044 } 1045 } 1046 1047 jlong os::javaTimeMillis() { 1048 timeval time; 1049 int status = gettimeofday(&time, NULL); 1050 assert(status != -1, "aix error at gettimeofday()"); 1051 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1052 } 1053 1054 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1055 timeval time; 1056 int status = gettimeofday(&time, NULL); 1057 assert(status != -1, "aix error at gettimeofday()"); 1058 seconds = jlong(time.tv_sec); 1059 nanos = jlong(time.tv_usec) * 1000; 1060 } 1061 1062 // We use mread_real_time here. 1063 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1064 // it has to be converted to real time. AIX documentations suggests to do 1065 // this unconditionally, so we do it. 1066 // 1067 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1068 // 1069 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1070 // conversion is necessary. However, mread_real_time will not return 1071 // monotonic results but merely matches read_real_time. So we need a tweak 1072 // to ensure monotonic results. 1073 // 1074 // For PASE no public documentation exists, just word by IBM 1075 jlong os::javaTimeNanos() { 1076 timebasestruct_t time; 1077 int rc = mread_real_time(&time, TIMEBASE_SZ); 1078 if (os::Aix::on_pase()) { 1079 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1080 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1081 jlong prev = max_real_time; 1082 if (now <= prev) { 1083 return prev; // same or retrograde time; 1084 } 1085 jlong obsv = Atomic::cmpxchg(&max_real_time, prev, now); 1086 assert(obsv >= prev, "invariant"); // Monotonicity 1087 // If the CAS succeeded then we're done and return "now". 1088 // If the CAS failed and the observed value "obsv" is >= now then 1089 // we should return "obsv". If the CAS failed and now > obsv > prv then 1090 // some other thread raced this thread and installed a new value, in which case 1091 // we could either (a) retry the entire operation, (b) retry trying to install now 1092 // or (c) just return obsv. We use (c). No loop is required although in some cases 1093 // we might discard a higher "now" value in deference to a slightly lower but freshly 1094 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1095 // to (a) or (b) -- and greatly reduces coherence traffic. 1096 // We might also condition (c) on the magnitude of the delta between obsv and now. 1097 // Avoiding excessive CAS operations to hot RW locations is critical. 1098 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1099 return (prev == obsv) ? now : obsv; 1100 } else { 1101 if (rc != RTC_POWER) { 1102 rc = time_base_to_time(&time, TIMEBASE_SZ); 1103 assert(rc != -1, "error calling time_base_to_time()"); 1104 } 1105 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1106 } 1107 } 1108 1109 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1110 info_ptr->max_value = ALL_64_BITS; 1111 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1112 info_ptr->may_skip_backward = false; 1113 info_ptr->may_skip_forward = false; 1114 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1115 } 1116 1117 // Return the real, user, and system times in seconds from an 1118 // arbitrary fixed point in the past. 1119 bool os::getTimesSecs(double* process_real_time, 1120 double* process_user_time, 1121 double* process_system_time) { 1122 struct tms ticks; 1123 clock_t real_ticks = times(&ticks); 1124 1125 if (real_ticks == (clock_t) (-1)) { 1126 return false; 1127 } else { 1128 double ticks_per_second = (double) clock_tics_per_sec; 1129 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1130 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1131 *process_real_time = ((double) real_ticks) / ticks_per_second; 1132 1133 return true; 1134 } 1135 } 1136 1137 char * os::local_time_string(char *buf, size_t buflen) { 1138 struct tm t; 1139 time_t long_time; 1140 time(&long_time); 1141 localtime_r(&long_time, &t); 1142 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1143 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1144 t.tm_hour, t.tm_min, t.tm_sec); 1145 return buf; 1146 } 1147 1148 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1149 return localtime_r(clock, res); 1150 } 1151 1152 //////////////////////////////////////////////////////////////////////////////// 1153 // runtime exit support 1154 1155 // Note: os::shutdown() might be called very early during initialization, or 1156 // called from signal handler. Before adding something to os::shutdown(), make 1157 // sure it is async-safe and can handle partially initialized VM. 1158 void os::shutdown() { 1159 1160 // allow PerfMemory to attempt cleanup of any persistent resources 1161 perfMemory_exit(); 1162 1163 // needs to remove object in file system 1164 AttachListener::abort(); 1165 1166 // flush buffered output, finish log files 1167 ostream_abort(); 1168 1169 // Check for abort hook 1170 abort_hook_t abort_hook = Arguments::abort_hook(); 1171 if (abort_hook != NULL) { 1172 abort_hook(); 1173 } 1174 } 1175 1176 // Note: os::abort() might be called very early during initialization, or 1177 // called from signal handler. Before adding something to os::abort(), make 1178 // sure it is async-safe and can handle partially initialized VM. 1179 void os::abort(bool dump_core, void* siginfo, const void* context) { 1180 os::shutdown(); 1181 if (dump_core) { 1182 ::abort(); // dump core 1183 } 1184 1185 ::exit(1); 1186 } 1187 1188 // Die immediately, no exit hook, no abort hook, no cleanup. 1189 // Dump a core file, if possible, for debugging. 1190 void os::die() { 1191 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1192 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1193 // and don't take the time to generate a core file. 1194 os::signal_raise(SIGKILL); 1195 } else { 1196 ::abort(); 1197 } 1198 } 1199 1200 intx os::current_thread_id() { 1201 return (intx)pthread_self(); 1202 } 1203 1204 int os::current_process_id() { 1205 return getpid(); 1206 } 1207 1208 // DLL functions 1209 1210 const char* os::dll_file_extension() { return ".so"; } 1211 1212 // This must be hard coded because it's the system's temporary 1213 // directory not the java application's temp directory, ala java.io.tmpdir. 1214 const char* os::get_temp_directory() { return "/tmp"; } 1215 1216 // Check if addr is inside libjvm.so. 1217 bool os::address_is_in_vm(address addr) { 1218 1219 // Input could be a real pc or a function pointer literal. The latter 1220 // would be a function descriptor residing in the data segment of a module. 1221 loaded_module_t lm; 1222 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1223 return lm.is_in_vm; 1224 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1225 return lm.is_in_vm; 1226 } else { 1227 return false; 1228 } 1229 1230 } 1231 1232 // Resolve an AIX function descriptor literal to a code pointer. 1233 // If the input is a valid code pointer to a text segment of a loaded module, 1234 // it is returned unchanged. 1235 // If the input is a valid AIX function descriptor, it is resolved to the 1236 // code entry point. 1237 // If the input is neither a valid function descriptor nor a valid code pointer, 1238 // NULL is returned. 1239 static address resolve_function_descriptor_to_code_pointer(address p) { 1240 1241 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1242 // It is a real code pointer. 1243 return p; 1244 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1245 // Pointer to data segment, potential function descriptor. 1246 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1247 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1248 // It is a function descriptor. 1249 return code_entry; 1250 } 1251 } 1252 1253 return NULL; 1254 } 1255 1256 bool os::dll_address_to_function_name(address addr, char *buf, 1257 int buflen, int *offset, 1258 bool demangle) { 1259 if (offset) { 1260 *offset = -1; 1261 } 1262 // Buf is not optional, but offset is optional. 1263 assert(buf != NULL, "sanity check"); 1264 buf[0] = '\0'; 1265 1266 // Resolve function ptr literals first. 1267 addr = resolve_function_descriptor_to_code_pointer(addr); 1268 if (!addr) { 1269 return false; 1270 } 1271 1272 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1273 } 1274 1275 bool os::dll_address_to_library_name(address addr, char* buf, 1276 int buflen, int* offset) { 1277 if (offset) { 1278 *offset = -1; 1279 } 1280 // Buf is not optional, but offset is optional. 1281 assert(buf != NULL, "sanity check"); 1282 buf[0] = '\0'; 1283 1284 // Resolve function ptr literals first. 1285 addr = resolve_function_descriptor_to_code_pointer(addr); 1286 if (!addr) { 1287 return false; 1288 } 1289 1290 return AixSymbols::get_module_name(addr, buf, buflen); 1291 } 1292 1293 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1294 // for the same architecture as Hotspot is running on. 1295 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1296 1297 log_info(os)("attempting shared library load of %s", filename); 1298 1299 if (ebuf && ebuflen > 0) { 1300 ebuf[0] = '\0'; 1301 ebuf[ebuflen - 1] = '\0'; 1302 } 1303 1304 if (!filename || strlen(filename) == 0) { 1305 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1306 return NULL; 1307 } 1308 1309 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1310 void * result= ::dlopen(filename, RTLD_LAZY); 1311 if (result != NULL) { 1312 Events::log(NULL, "Loaded shared library %s", filename); 1313 // Reload dll cache. Don't do this in signal handling. 1314 LoadedLibraries::reload(); 1315 log_info(os)("shared library load of %s was successful", filename); 1316 return result; 1317 } else { 1318 // error analysis when dlopen fails 1319 const char* error_report = ::dlerror(); 1320 if (error_report == NULL) { 1321 error_report = "dlerror returned no error description"; 1322 } 1323 if (ebuf != NULL && ebuflen > 0) { 1324 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1325 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1326 } 1327 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1328 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1329 } 1330 return NULL; 1331 } 1332 1333 void* os::dll_lookup(void* handle, const char* name) { 1334 void* res = dlsym(handle, name); 1335 return res; 1336 } 1337 1338 void* os::get_default_process_handle() { 1339 return (void*)::dlopen(NULL, RTLD_LAZY); 1340 } 1341 1342 void os::print_dll_info(outputStream *st) { 1343 st->print_cr("Dynamic libraries:"); 1344 LoadedLibraries::print(st); 1345 } 1346 1347 void os::get_summary_os_info(char* buf, size_t buflen) { 1348 // There might be something more readable than uname results for AIX. 1349 struct utsname name; 1350 uname(&name); 1351 snprintf(buf, buflen, "%s %s", name.release, name.version); 1352 } 1353 1354 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1355 // Not yet implemented. 1356 return 0; 1357 } 1358 1359 void os::print_os_info_brief(outputStream* st) { 1360 uint32_t ver = os::Aix::os_version(); 1361 st->print_cr("AIX kernel version %u.%u.%u.%u", 1362 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1363 1364 os::Posix::print_uname_info(st); 1365 1366 // Linux uses print_libversion_info(st); here. 1367 } 1368 1369 void os::print_os_info(outputStream* st) { 1370 st->print_cr("OS:"); 1371 1372 os::Posix::print_uname_info(st); 1373 1374 uint32_t ver = os::Aix::os_version(); 1375 st->print_cr("AIX kernel version %u.%u.%u.%u", 1376 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1377 1378 os::Posix::print_uptime_info(st); 1379 1380 os::Posix::print_rlimit_info(st); 1381 1382 os::Posix::print_load_average(st); 1383 1384 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process. 1385 long tmax = sysconf(_SC_THREAD_THREADS_MAX); 1386 st->print_cr("maximum #threads within a process:%ld", tmax); 1387 1388 // print wpar info 1389 libperfstat::wparinfo_t wi; 1390 if (libperfstat::get_wparinfo(&wi)) { 1391 st->print_cr("wpar info"); 1392 st->print_cr("name: %s", wi.name); 1393 st->print_cr("id: %d", wi.wpar_id); 1394 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1395 } 1396 1397 VM_Version::print_platform_virtualization_info(st); 1398 } 1399 1400 void os::print_memory_info(outputStream* st) { 1401 1402 st->print_cr("Memory:"); 1403 1404 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1405 describe_pagesize(g_multipage_support.pagesize)); 1406 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1407 describe_pagesize(g_multipage_support.datapsize)); 1408 st->print_cr(" Text page size: %s", 1409 describe_pagesize(g_multipage_support.textpsize)); 1410 st->print_cr(" Thread stack page size (pthread): %s", 1411 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1412 st->print_cr(" Default shared memory page size: %s", 1413 describe_pagesize(g_multipage_support.shmpsize)); 1414 st->print_cr(" Can use 64K pages dynamically with shared memory: %s", 1415 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1416 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1417 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1418 st->print_cr(" Multipage error: %d", 1419 g_multipage_support.error); 1420 st->cr(); 1421 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1422 1423 // print out LDR_CNTRL because it affects the default page sizes 1424 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1425 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1426 1427 // Print out EXTSHM because it is an unsupported setting. 1428 const char* const extshm = ::getenv("EXTSHM"); 1429 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1430 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1431 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1432 } 1433 1434 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1435 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1436 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1437 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1438 st->cr(); 1439 1440 os::Aix::meminfo_t mi; 1441 if (os::Aix::get_meminfo(&mi)) { 1442 if (os::Aix::on_aix()) { 1443 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1444 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1445 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1446 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1447 } else { 1448 // PASE - Numbers are result of QWCRSSTS; they mean: 1449 // real_total: Sum of all system pools 1450 // real_free: always 0 1451 // pgsp_total: we take the size of the system ASP 1452 // pgsp_free: size of system ASP times percentage of system ASP unused 1453 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1454 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1455 st->print_cr("%% system asp used : %.2f", 1456 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1457 } 1458 } 1459 st->cr(); 1460 1461 // Print program break. 1462 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1463 address brk_now = (address)::sbrk(0); 1464 if (brk_now != (address)-1) { 1465 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1466 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1467 } 1468 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1469 st->cr(); 1470 1471 // Print segments allocated with os::reserve_memory. 1472 st->print_cr("internal virtual memory regions used by vm:"); 1473 vmembk_print_on(st); 1474 } 1475 1476 // Get a string for the cpuinfo that is a summary of the cpu type 1477 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1478 // read _system_configuration.version 1479 switch (_system_configuration.version) { 1480 case PV_9: 1481 strncpy(buf, "Power PC 9", buflen); 1482 break; 1483 case PV_8: 1484 strncpy(buf, "Power PC 8", buflen); 1485 break; 1486 case PV_7: 1487 strncpy(buf, "Power PC 7", buflen); 1488 break; 1489 case PV_6_1: 1490 strncpy(buf, "Power PC 6 DD1.x", buflen); 1491 break; 1492 case PV_6: 1493 strncpy(buf, "Power PC 6", buflen); 1494 break; 1495 case PV_5: 1496 strncpy(buf, "Power PC 5", buflen); 1497 break; 1498 case PV_5_2: 1499 strncpy(buf, "Power PC 5_2", buflen); 1500 break; 1501 case PV_5_3: 1502 strncpy(buf, "Power PC 5_3", buflen); 1503 break; 1504 case PV_5_Compat: 1505 strncpy(buf, "PV_5_Compat", buflen); 1506 break; 1507 case PV_6_Compat: 1508 strncpy(buf, "PV_6_Compat", buflen); 1509 break; 1510 case PV_7_Compat: 1511 strncpy(buf, "PV_7_Compat", buflen); 1512 break; 1513 case PV_8_Compat: 1514 strncpy(buf, "PV_8_Compat", buflen); 1515 break; 1516 case PV_9_Compat: 1517 strncpy(buf, "PV_9_Compat", buflen); 1518 break; 1519 default: 1520 strncpy(buf, "unknown", buflen); 1521 } 1522 } 1523 1524 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1525 // Nothing to do beyond of what os::print_cpu_info() does. 1526 } 1527 1528 static void print_signal_handler(outputStream* st, int sig, 1529 char* buf, size_t buflen); 1530 1531 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1532 st->print_cr("Signal Handlers:"); 1533 print_signal_handler(st, SIGSEGV, buf, buflen); 1534 print_signal_handler(st, SIGBUS , buf, buflen); 1535 print_signal_handler(st, SIGFPE , buf, buflen); 1536 print_signal_handler(st, SIGPIPE, buf, buflen); 1537 print_signal_handler(st, SIGXFSZ, buf, buflen); 1538 print_signal_handler(st, SIGILL , buf, buflen); 1539 print_signal_handler(st, SR_signum, buf, buflen); 1540 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1541 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1542 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1543 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1544 print_signal_handler(st, SIGTRAP, buf, buflen); 1545 // We also want to know if someone else adds a SIGDANGER handler because 1546 // that will interfere with OOM killling. 1547 print_signal_handler(st, SIGDANGER, buf, buflen); 1548 } 1549 1550 static char saved_jvm_path[MAXPATHLEN] = {0}; 1551 1552 // Find the full path to the current module, libjvm.so. 1553 void os::jvm_path(char *buf, jint buflen) { 1554 // Error checking. 1555 if (buflen < MAXPATHLEN) { 1556 assert(false, "must use a large-enough buffer"); 1557 buf[0] = '\0'; 1558 return; 1559 } 1560 // Lazy resolve the path to current module. 1561 if (saved_jvm_path[0] != 0) { 1562 strcpy(buf, saved_jvm_path); 1563 return; 1564 } 1565 1566 Dl_info dlinfo; 1567 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1568 assert(ret != 0, "cannot locate libjvm"); 1569 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1570 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1571 1572 if (Arguments::sun_java_launcher_is_altjvm()) { 1573 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1574 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1575 // If "/jre/lib/" appears at the right place in the string, then 1576 // assume we are installed in a JDK and we're done. Otherwise, check 1577 // for a JAVA_HOME environment variable and fix up the path so it 1578 // looks like libjvm.so is installed there (append a fake suffix 1579 // hotspot/libjvm.so). 1580 const char *p = buf + strlen(buf) - 1; 1581 for (int count = 0; p > buf && count < 4; ++count) { 1582 for (--p; p > buf && *p != '/'; --p) 1583 /* empty */ ; 1584 } 1585 1586 if (strncmp(p, "/jre/lib/", 9) != 0) { 1587 // Look for JAVA_HOME in the environment. 1588 char* java_home_var = ::getenv("JAVA_HOME"); 1589 if (java_home_var != NULL && java_home_var[0] != 0) { 1590 char* jrelib_p; 1591 int len; 1592 1593 // Check the current module name "libjvm.so". 1594 p = strrchr(buf, '/'); 1595 if (p == NULL) { 1596 return; 1597 } 1598 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1599 1600 rp = os::Posix::realpath(java_home_var, buf, buflen); 1601 if (rp == NULL) { 1602 return; 1603 } 1604 1605 // determine if this is a legacy image or modules image 1606 // modules image doesn't have "jre" subdirectory 1607 len = strlen(buf); 1608 assert(len < buflen, "Ran out of buffer room"); 1609 jrelib_p = buf + len; 1610 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1611 if (0 != access(buf, F_OK)) { 1612 snprintf(jrelib_p, buflen-len, "/lib"); 1613 } 1614 1615 if (0 == access(buf, F_OK)) { 1616 // Use current module name "libjvm.so" 1617 len = strlen(buf); 1618 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1619 } else { 1620 // Go back to path of .so 1621 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1622 if (rp == NULL) { 1623 return; 1624 } 1625 } 1626 } 1627 } 1628 } 1629 1630 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1631 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1632 } 1633 1634 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1635 // no prefix required, not even "_" 1636 } 1637 1638 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1639 // no suffix required 1640 } 1641 1642 //////////////////////////////////////////////////////////////////////////////// 1643 // sun.misc.Signal support 1644 1645 static void 1646 UserHandler(int sig, void *siginfo, void *context) { 1647 // Ctrl-C is pressed during error reporting, likely because the error 1648 // handler fails to abort. Let VM die immediately. 1649 if (sig == SIGINT && VMError::is_error_reported()) { 1650 os::die(); 1651 } 1652 1653 os::signal_notify(sig); 1654 } 1655 1656 void* os::user_handler() { 1657 return CAST_FROM_FN_PTR(void*, UserHandler); 1658 } 1659 1660 extern "C" { 1661 typedef void (*sa_handler_t)(int); 1662 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1663 } 1664 1665 void* os::signal(int signal_number, void* handler) { 1666 struct sigaction sigAct, oldSigAct; 1667 1668 sigfillset(&(sigAct.sa_mask)); 1669 1670 // Do not block out synchronous signals in the signal handler. 1671 // Blocking synchronous signals only makes sense if you can really 1672 // be sure that those signals won't happen during signal handling, 1673 // when the blocking applies. Normal signal handlers are lean and 1674 // do not cause signals. But our signal handlers tend to be "risky" 1675 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1676 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1677 // by a SIGILL, which was blocked due to the signal mask. The process 1678 // just hung forever. Better to crash from a secondary signal than to hang. 1679 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1680 sigdelset(&(sigAct.sa_mask), SIGBUS); 1681 sigdelset(&(sigAct.sa_mask), SIGILL); 1682 sigdelset(&(sigAct.sa_mask), SIGFPE); 1683 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1684 1685 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1686 1687 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1688 1689 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1690 // -1 means registration failed 1691 return (void *)-1; 1692 } 1693 1694 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1695 } 1696 1697 void os::signal_raise(int signal_number) { 1698 ::raise(signal_number); 1699 } 1700 1701 // 1702 // The following code is moved from os.cpp for making this 1703 // code platform specific, which it is by its very nature. 1704 // 1705 1706 // Will be modified when max signal is changed to be dynamic 1707 int os::sigexitnum_pd() { 1708 return NSIG; 1709 } 1710 1711 // a counter for each possible signal value 1712 static volatile jint pending_signals[NSIG+1] = { 0 }; 1713 1714 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1715 // On AIX, we use sem_init(), sem_post(), sem_wait() 1716 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1717 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1718 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1719 // on AIX, msem_..() calls are suspected of causing problems. 1720 static sem_t sig_sem; 1721 static msemaphore* p_sig_msem = 0; 1722 1723 static void local_sem_init() { 1724 if (os::Aix::on_aix()) { 1725 int rc = ::sem_init(&sig_sem, 0, 0); 1726 guarantee(rc != -1, "sem_init failed"); 1727 } else { 1728 // Memory semaphores must live in shared mem. 1729 guarantee0(p_sig_msem == NULL); 1730 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1731 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1732 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1733 } 1734 } 1735 1736 static void local_sem_post() { 1737 static bool warn_only_once = false; 1738 if (os::Aix::on_aix()) { 1739 int rc = ::sem_post(&sig_sem); 1740 if (rc == -1 && !warn_only_once) { 1741 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1742 warn_only_once = true; 1743 } 1744 } else { 1745 guarantee0(p_sig_msem != NULL); 1746 int rc = ::msem_unlock(p_sig_msem, 0); 1747 if (rc == -1 && !warn_only_once) { 1748 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1749 warn_only_once = true; 1750 } 1751 } 1752 } 1753 1754 static void local_sem_wait() { 1755 static bool warn_only_once = false; 1756 if (os::Aix::on_aix()) { 1757 int rc = ::sem_wait(&sig_sem); 1758 if (rc == -1 && !warn_only_once) { 1759 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1760 warn_only_once = true; 1761 } 1762 } else { 1763 guarantee0(p_sig_msem != NULL); // must init before use 1764 int rc = ::msem_lock(p_sig_msem, 0); 1765 if (rc == -1 && !warn_only_once) { 1766 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1767 warn_only_once = true; 1768 } 1769 } 1770 } 1771 1772 static void jdk_misc_signal_init() { 1773 // Initialize signal structures 1774 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1775 1776 // Initialize signal semaphore 1777 local_sem_init(); 1778 } 1779 1780 void os::signal_notify(int sig) { 1781 Atomic::inc(&pending_signals[sig]); 1782 local_sem_post(); 1783 } 1784 1785 static int check_pending_signals() { 1786 for (;;) { 1787 for (int i = 0; i < NSIG + 1; i++) { 1788 jint n = pending_signals[i]; 1789 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { 1790 return i; 1791 } 1792 } 1793 JavaThread *thread = JavaThread::current(); 1794 ThreadBlockInVM tbivm(thread); 1795 1796 bool threadIsSuspended; 1797 do { 1798 thread->set_suspend_equivalent(); 1799 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1800 1801 local_sem_wait(); 1802 1803 // were we externally suspended while we were waiting? 1804 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1805 if (threadIsSuspended) { 1806 // 1807 // The semaphore has been incremented, but while we were waiting 1808 // another thread suspended us. We don't want to continue running 1809 // while suspended because that would surprise the thread that 1810 // suspended us. 1811 // 1812 1813 local_sem_post(); 1814 1815 thread->java_suspend_self(); 1816 } 1817 } while (threadIsSuspended); 1818 } 1819 } 1820 1821 int os::signal_wait() { 1822 return check_pending_signals(); 1823 } 1824 1825 //////////////////////////////////////////////////////////////////////////////// 1826 // Virtual Memory 1827 1828 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1829 1830 #define VMEM_MAPPED 1 1831 #define VMEM_SHMATED 2 1832 1833 struct vmembk_t { 1834 int type; // 1 - mmap, 2 - shmat 1835 char* addr; 1836 size_t size; // Real size, may be larger than usersize. 1837 size_t pagesize; // page size of area 1838 vmembk_t* next; 1839 1840 bool contains_addr(char* p) const { 1841 return p >= addr && p < (addr + size); 1842 } 1843 1844 bool contains_range(char* p, size_t s) const { 1845 return contains_addr(p) && contains_addr(p + s - 1); 1846 } 1847 1848 void print_on(outputStream* os) const { 1849 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1850 " bytes, %d %s pages), %s", 1851 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1852 (type == VMEM_SHMATED ? "shmat" : "mmap") 1853 ); 1854 } 1855 1856 // Check that range is a sub range of memory block (or equal to memory block); 1857 // also check that range is fully page aligned to the page size if the block. 1858 void assert_is_valid_subrange(char* p, size_t s) const { 1859 if (!contains_range(p, s)) { 1860 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1861 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1862 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size)); 1863 guarantee0(false); 1864 } 1865 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1866 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1867 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize); 1868 guarantee0(false); 1869 } 1870 } 1871 }; 1872 1873 static struct { 1874 vmembk_t* first; 1875 MiscUtils::CritSect cs; 1876 } vmem; 1877 1878 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1879 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1880 assert0(p); 1881 if (p) { 1882 MiscUtils::AutoCritSect lck(&vmem.cs); 1883 p->addr = addr; p->size = size; 1884 p->pagesize = pagesize; 1885 p->type = type; 1886 p->next = vmem.first; 1887 vmem.first = p; 1888 } 1889 } 1890 1891 static vmembk_t* vmembk_find(char* addr) { 1892 MiscUtils::AutoCritSect lck(&vmem.cs); 1893 for (vmembk_t* p = vmem.first; p; p = p->next) { 1894 if (p->addr <= addr && (p->addr + p->size) > addr) { 1895 return p; 1896 } 1897 } 1898 return NULL; 1899 } 1900 1901 static void vmembk_remove(vmembk_t* p0) { 1902 MiscUtils::AutoCritSect lck(&vmem.cs); 1903 assert0(p0); 1904 assert0(vmem.first); // List should not be empty. 1905 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1906 if (*pp == p0) { 1907 *pp = p0->next; 1908 ::free(p0); 1909 return; 1910 } 1911 } 1912 assert0(false); // Not found? 1913 } 1914 1915 static void vmembk_print_on(outputStream* os) { 1916 MiscUtils::AutoCritSect lck(&vmem.cs); 1917 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1918 vmi->print_on(os); 1919 os->cr(); 1920 } 1921 } 1922 1923 // Reserve and attach a section of System V memory. 1924 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1925 // address. Failing that, it will attach the memory anywhere. 1926 // If <requested_addr> is NULL, function will attach the memory anywhere. 1927 // 1928 // <alignment_hint> is being ignored by this function. It is very probable however that the 1929 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1930 // Should this be not enogh, we can put more work into it. 1931 static char* reserve_shmated_memory ( 1932 size_t bytes, 1933 char* requested_addr, 1934 size_t alignment_hint) { 1935 1936 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1937 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1938 bytes, p2i(requested_addr), alignment_hint); 1939 1940 // Either give me wish address or wish alignment but not both. 1941 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1942 1943 // We must prevent anyone from attaching too close to the 1944 // BRK because that may cause malloc OOM. 1945 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1946 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1947 "Will attach anywhere.", p2i(requested_addr)); 1948 // Act like the OS refused to attach there. 1949 requested_addr = NULL; 1950 } 1951 1952 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1953 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1954 if (os::Aix::on_pase_V5R4_or_older()) { 1955 ShouldNotReachHere(); 1956 } 1957 1958 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 1959 const size_t size = align_up(bytes, 64*K); 1960 1961 // Reserve the shared segment. 1962 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 1963 if (shmid == -1) { 1964 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 1965 return NULL; 1966 } 1967 1968 // Important note: 1969 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 1970 // We must right after attaching it remove it from the system. System V shm segments are global and 1971 // survive the process. 1972 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 1973 1974 struct shmid_ds shmbuf; 1975 memset(&shmbuf, 0, sizeof(shmbuf)); 1976 shmbuf.shm_pagesize = 64*K; 1977 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 1978 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 1979 size / (64*K), errno); 1980 // I want to know if this ever happens. 1981 assert(false, "failed to set page size for shmat"); 1982 } 1983 1984 // Now attach the shared segment. 1985 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 1986 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 1987 // were not a segment boundary. 1988 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 1989 const int errno_shmat = errno; 1990 1991 // (A) Right after shmat and before handing shmat errors delete the shm segment. 1992 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 1993 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 1994 assert(false, "failed to remove shared memory segment!"); 1995 } 1996 1997 // Handle shmat error. If we failed to attach, just return. 1998 if (addr == (char*)-1) { 1999 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat); 2000 return NULL; 2001 } 2002 2003 // Just for info: query the real page size. In case setting the page size did not 2004 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2005 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2006 if (real_pagesize != shmbuf.shm_pagesize) { 2007 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize); 2008 } 2009 2010 if (addr) { 2011 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2012 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize)); 2013 } else { 2014 if (requested_addr != NULL) { 2015 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr)); 2016 } else { 2017 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2018 } 2019 } 2020 2021 // book-keeping 2022 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2023 assert0(is_aligned_to(addr, os::vm_page_size())); 2024 2025 return addr; 2026 } 2027 2028 static bool release_shmated_memory(char* addr, size_t size) { 2029 2030 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2031 p2i(addr), p2i(addr + size - 1)); 2032 2033 bool rc = false; 2034 2035 // TODO: is there a way to verify shm size without doing bookkeeping? 2036 if (::shmdt(addr) != 0) { 2037 trcVerbose("error (%d).", errno); 2038 } else { 2039 trcVerbose("ok."); 2040 rc = true; 2041 } 2042 return rc; 2043 } 2044 2045 static bool uncommit_shmated_memory(char* addr, size_t size) { 2046 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2047 p2i(addr), p2i(addr + size - 1)); 2048 2049 const bool rc = my_disclaim64(addr, size); 2050 2051 if (!rc) { 2052 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size); 2053 return false; 2054 } 2055 return true; 2056 } 2057 2058 //////////////////////////////// mmap-based routines ///////////////////////////////// 2059 2060 // Reserve memory via mmap. 2061 // If <requested_addr> is given, an attempt is made to attach at the given address. 2062 // Failing that, memory is allocated at any address. 2063 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2064 // allocate at an address aligned with the given alignment. Failing that, memory 2065 // is aligned anywhere. 2066 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2067 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2068 "alignment_hint " UINTX_FORMAT "...", 2069 bytes, p2i(requested_addr), alignment_hint); 2070 2071 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2072 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2073 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr)); 2074 return NULL; 2075 } 2076 2077 // We must prevent anyone from attaching too close to the 2078 // BRK because that may cause malloc OOM. 2079 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2080 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2081 "Will attach anywhere.", p2i(requested_addr)); 2082 // Act like the OS refused to attach there. 2083 requested_addr = NULL; 2084 } 2085 2086 // Specify one or the other but not both. 2087 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2088 2089 // In 64K mode, we claim the global page size (os::vm_page_size()) 2090 // is 64K. This is one of the few points where that illusion may 2091 // break, because mmap() will always return memory aligned to 4K. So 2092 // we must ensure we only ever return memory aligned to 64k. 2093 if (alignment_hint) { 2094 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2095 } else { 2096 alignment_hint = os::vm_page_size(); 2097 } 2098 2099 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2100 const size_t size = align_up(bytes, os::vm_page_size()); 2101 2102 // alignment: Allocate memory large enough to include an aligned range of the right size and 2103 // cut off the leading and trailing waste pages. 2104 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2105 const size_t extra_size = size + alignment_hint; 2106 2107 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2108 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2109 int flags = MAP_ANONYMOUS | MAP_SHARED; 2110 2111 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2112 // it means if wishaddress is given but MAP_FIXED is not set. 2113 // 2114 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2115 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2116 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2117 // get clobbered. 2118 if (requested_addr != NULL) { 2119 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2120 flags |= MAP_FIXED; 2121 } 2122 } 2123 2124 char* addr = (char*)::mmap(requested_addr, extra_size, 2125 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2126 2127 if (addr == MAP_FAILED) { 2128 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno); 2129 return NULL; 2130 } 2131 2132 // Handle alignment. 2133 char* const addr_aligned = align_up(addr, alignment_hint); 2134 const size_t waste_pre = addr_aligned - addr; 2135 char* const addr_aligned_end = addr_aligned + size; 2136 const size_t waste_post = extra_size - waste_pre - size; 2137 if (waste_pre > 0) { 2138 ::munmap(addr, waste_pre); 2139 } 2140 if (waste_post > 0) { 2141 ::munmap(addr_aligned_end, waste_post); 2142 } 2143 addr = addr_aligned; 2144 2145 if (addr) { 2146 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2147 p2i(addr), p2i(addr + bytes), bytes); 2148 } else { 2149 if (requested_addr != NULL) { 2150 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr)); 2151 } else { 2152 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2153 } 2154 } 2155 2156 // bookkeeping 2157 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2158 2159 // Test alignment, see above. 2160 assert0(is_aligned_to(addr, os::vm_page_size())); 2161 2162 return addr; 2163 } 2164 2165 static bool release_mmaped_memory(char* addr, size_t size) { 2166 assert0(is_aligned_to(addr, os::vm_page_size())); 2167 assert0(is_aligned_to(size, os::vm_page_size())); 2168 2169 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2170 p2i(addr), p2i(addr + size - 1)); 2171 bool rc = false; 2172 2173 if (::munmap(addr, size) != 0) { 2174 trcVerbose("failed (%d)\n", errno); 2175 rc = false; 2176 } else { 2177 trcVerbose("ok."); 2178 rc = true; 2179 } 2180 2181 return rc; 2182 } 2183 2184 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2185 2186 assert0(is_aligned_to(addr, os::vm_page_size())); 2187 assert0(is_aligned_to(size, os::vm_page_size())); 2188 2189 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2190 p2i(addr), p2i(addr + size - 1)); 2191 bool rc = false; 2192 2193 // Uncommit mmap memory with msync MS_INVALIDATE. 2194 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2195 trcVerbose("failed (%d)\n", errno); 2196 rc = false; 2197 } else { 2198 trcVerbose("ok."); 2199 rc = true; 2200 } 2201 2202 return rc; 2203 } 2204 2205 int os::vm_page_size() { 2206 // Seems redundant as all get out. 2207 assert(os::Aix::page_size() != -1, "must call os::init"); 2208 return os::Aix::page_size(); 2209 } 2210 2211 // Aix allocates memory by pages. 2212 int os::vm_allocation_granularity() { 2213 assert(os::Aix::page_size() != -1, "must call os::init"); 2214 return os::Aix::page_size(); 2215 } 2216 2217 #ifdef PRODUCT 2218 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2219 int err) { 2220 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2221 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec, 2222 os::errno_name(err), err); 2223 } 2224 #endif 2225 2226 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2227 const char* mesg) { 2228 assert(mesg != NULL, "mesg must be specified"); 2229 if (!pd_commit_memory(addr, size, exec)) { 2230 // Add extra info in product mode for vm_exit_out_of_memory(): 2231 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2232 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2233 } 2234 } 2235 2236 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2237 2238 assert(is_aligned_to(addr, os::vm_page_size()), 2239 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2240 p2i(addr), os::vm_page_size()); 2241 assert(is_aligned_to(size, os::vm_page_size()), 2242 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2243 size, os::vm_page_size()); 2244 2245 vmembk_t* const vmi = vmembk_find(addr); 2246 guarantee0(vmi); 2247 vmi->assert_is_valid_subrange(addr, size); 2248 2249 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); 2250 2251 if (UseExplicitCommit) { 2252 // AIX commits memory on touch. So, touch all pages to be committed. 2253 for (char* p = addr; p < (addr + size); p += 4*K) { 2254 *p = '\0'; 2255 } 2256 } 2257 2258 return true; 2259 } 2260 2261 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2262 return pd_commit_memory(addr, size, exec); 2263 } 2264 2265 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2266 size_t alignment_hint, bool exec, 2267 const char* mesg) { 2268 // Alignment_hint is ignored on this OS. 2269 pd_commit_memory_or_exit(addr, size, exec, mesg); 2270 } 2271 2272 bool os::pd_uncommit_memory(char* addr, size_t size, bool exec) { 2273 assert(is_aligned_to(addr, os::vm_page_size()), 2274 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2275 p2i(addr), os::vm_page_size()); 2276 assert(is_aligned_to(size, os::vm_page_size()), 2277 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2278 size, os::vm_page_size()); 2279 2280 // Dynamically do different things for mmap/shmat. 2281 const vmembk_t* const vmi = vmembk_find(addr); 2282 guarantee0(vmi); 2283 vmi->assert_is_valid_subrange(addr, size); 2284 2285 if (vmi->type == VMEM_SHMATED) { 2286 return uncommit_shmated_memory(addr, size); 2287 } else { 2288 return uncommit_mmaped_memory(addr, size); 2289 } 2290 } 2291 2292 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2293 // Do not call this; no need to commit stack pages on AIX. 2294 ShouldNotReachHere(); 2295 return true; 2296 } 2297 2298 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2299 // Do not call this; no need to commit stack pages on AIX. 2300 ShouldNotReachHere(); 2301 return true; 2302 } 2303 2304 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2305 } 2306 2307 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2308 } 2309 2310 void os::numa_make_global(char *addr, size_t bytes) { 2311 } 2312 2313 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2314 } 2315 2316 bool os::numa_topology_changed() { 2317 return false; 2318 } 2319 2320 size_t os::numa_get_groups_num() { 2321 return 1; 2322 } 2323 2324 int os::numa_get_group_id() { 2325 return 0; 2326 } 2327 2328 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2329 if (size > 0) { 2330 ids[0] = 0; 2331 return 1; 2332 } 2333 return 0; 2334 } 2335 2336 int os::numa_get_group_id_for_address(const void* address) { 2337 return 0; 2338 } 2339 2340 bool os::get_page_info(char *start, page_info* info) { 2341 return false; 2342 } 2343 2344 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2345 return end; 2346 } 2347 2348 // Reserves and attaches a shared memory segment. 2349 // Will assert if a wish address is given and could not be obtained. 2350 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint, bool executable) { 2351 2352 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2353 // thereby clobbering old mappings at that place. That is probably 2354 // not intended, never used and almost certainly an error were it 2355 // ever be used this way (to try attaching at a specified address 2356 // without clobbering old mappings an alternate API exists, 2357 // os::attempt_reserve_memory_at()). 2358 // Instead of mimicking the dangerous coding of the other platforms, here I 2359 // just ignore the request address (release) or assert(debug). 2360 assert0(requested_addr == NULL); 2361 2362 // Always round to os::vm_page_size(), which may be larger than 4K. 2363 bytes = align_up(bytes, os::vm_page_size()); 2364 const size_t alignment_hint0 = 2365 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2366 2367 // In 4K mode always use mmap. 2368 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2369 if (os::vm_page_size() == 4*K) { 2370 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2371 } else { 2372 if (bytes >= Use64KPagesThreshold) { 2373 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2374 } else { 2375 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2376 } 2377 } 2378 } 2379 2380 bool os::pd_release_memory(char* addr, size_t size) { 2381 2382 // Dynamically do different things for mmap/shmat. 2383 vmembk_t* const vmi = vmembk_find(addr); 2384 guarantee0(vmi); 2385 2386 // Always round to os::vm_page_size(), which may be larger than 4K. 2387 size = align_up(size, os::vm_page_size()); 2388 addr = align_up(addr, os::vm_page_size()); 2389 2390 bool rc = false; 2391 bool remove_bookkeeping = false; 2392 if (vmi->type == VMEM_SHMATED) { 2393 // For shmatted memory, we do: 2394 // - If user wants to release the whole range, release the memory (shmdt). 2395 // - If user only wants to release a partial range, uncommit (disclaim) that 2396 // range. That way, at least, we do not use memory anymore (bust still page 2397 // table space). 2398 vmi->assert_is_valid_subrange(addr, size); 2399 if (addr == vmi->addr && size == vmi->size) { 2400 rc = release_shmated_memory(addr, size); 2401 remove_bookkeeping = true; 2402 } else { 2403 rc = uncommit_shmated_memory(addr, size); 2404 } 2405 } else { 2406 // User may unmap partial regions but region has to be fully contained. 2407 #ifdef ASSERT 2408 vmi->assert_is_valid_subrange(addr, size); 2409 #endif 2410 rc = release_mmaped_memory(addr, size); 2411 remove_bookkeeping = true; 2412 } 2413 2414 // update bookkeeping 2415 if (rc && remove_bookkeeping) { 2416 vmembk_remove(vmi); 2417 } 2418 2419 return rc; 2420 } 2421 2422 static bool checked_mprotect(char* addr, size_t size, int prot) { 2423 2424 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2425 // not tell me if protection failed when trying to protect an un-protectable range. 2426 // 2427 // This means if the memory was allocated using shmget/shmat, protection wont work 2428 // but mprotect will still return 0: 2429 // 2430 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2431 2432 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2433 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2434 2435 if (!rc) { 2436 const char* const s_errno = os::errno_name(errno); 2437 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2438 return false; 2439 } 2440 2441 // mprotect success check 2442 // 2443 // Mprotect said it changed the protection but can I believe it? 2444 // 2445 // To be sure I need to check the protection afterwards. Try to 2446 // read from protected memory and check whether that causes a segfault. 2447 // 2448 if (!os::Aix::xpg_sus_mode()) { 2449 2450 if (CanUseSafeFetch32()) { 2451 2452 const bool read_protected = 2453 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2454 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2455 2456 if (prot & PROT_READ) { 2457 rc = !read_protected; 2458 } else { 2459 rc = read_protected; 2460 } 2461 2462 if (!rc) { 2463 if (os::Aix::on_pase()) { 2464 // There is an issue on older PASE systems where mprotect() will return success but the 2465 // memory will not be protected. 2466 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2467 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2468 // a stack. It is an OS error. 2469 // 2470 // A valid strategy is just to try again. This usually works. :-/ 2471 2472 ::usleep(1000); 2473 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2474 if (::mprotect(addr, size, prot) == 0) { 2475 const bool read_protected_2 = 2476 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2477 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2478 rc = true; 2479 } 2480 } 2481 } 2482 } 2483 } 2484 2485 assert(rc == true, "mprotect failed."); 2486 2487 return rc; 2488 } 2489 2490 // Set protections specified 2491 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2492 unsigned int p = 0; 2493 switch (prot) { 2494 case MEM_PROT_NONE: p = PROT_NONE; break; 2495 case MEM_PROT_READ: p = PROT_READ; break; 2496 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2497 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2498 default: 2499 ShouldNotReachHere(); 2500 } 2501 // is_committed is unused. 2502 return checked_mprotect(addr, size, p); 2503 } 2504 2505 bool os::guard_memory(char* addr, size_t size) { 2506 return checked_mprotect(addr, size, PROT_NONE); 2507 } 2508 2509 bool os::unguard_memory(char* addr, size_t size) { 2510 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2511 } 2512 2513 // Large page support 2514 2515 static size_t _large_page_size = 0; 2516 2517 // Enable large page support if OS allows that. 2518 void os::large_page_init() { 2519 return; // Nothing to do. See query_multipage_support and friends. 2520 } 2521 2522 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2523 fatal("os::reserve_memory_special should not be called on AIX."); 2524 return NULL; 2525 } 2526 2527 bool os::pd_release_memory_special(char* base, size_t bytes) { 2528 fatal("os::release_memory_special should not be called on AIX."); 2529 return false; 2530 } 2531 2532 size_t os::large_page_size() { 2533 return _large_page_size; 2534 } 2535 2536 bool os::can_commit_large_page_memory() { 2537 // Does not matter, we do not support huge pages. 2538 return false; 2539 } 2540 2541 bool os::can_execute_large_page_memory() { 2542 // Does not matter, we do not support huge pages. 2543 return false; 2544 } 2545 2546 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2547 assert(file_desc >= 0, "file_desc is not valid"); 2548 char* result = NULL; 2549 2550 // Always round to os::vm_page_size(), which may be larger than 4K. 2551 bytes = align_up(bytes, os::vm_page_size()); 2552 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2553 2554 if (result != NULL) { 2555 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2556 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2557 } 2558 } 2559 return result; 2560 } 2561 2562 // Reserve memory at an arbitrary address, only if that area is 2563 // available (and not reserved for something else). 2564 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2565 char* addr = NULL; 2566 2567 // Always round to os::vm_page_size(), which may be larger than 4K. 2568 bytes = align_up(bytes, os::vm_page_size()); 2569 2570 // In 4K mode always use mmap. 2571 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2572 if (os::vm_page_size() == 4*K) { 2573 return reserve_mmaped_memory(bytes, requested_addr, 0); 2574 } else { 2575 if (bytes >= Use64KPagesThreshold) { 2576 return reserve_shmated_memory(bytes, requested_addr, 0); 2577 } else { 2578 return reserve_mmaped_memory(bytes, requested_addr, 0); 2579 } 2580 } 2581 2582 return addr; 2583 } 2584 2585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2586 void os::infinite_sleep() { 2587 while (true) { // sleep forever ... 2588 ::sleep(100); // ... 100 seconds at a time 2589 } 2590 } 2591 2592 // Used to convert frequent JVM_Yield() to nops 2593 bool os::dont_yield() { 2594 return DontYieldALot; 2595 } 2596 2597 void os::naked_yield() { 2598 sched_yield(); 2599 } 2600 2601 //////////////////////////////////////////////////////////////////////////////// 2602 // thread priority support 2603 2604 // From AIX manpage to pthread_setschedparam 2605 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2606 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2607 // 2608 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2609 // range from 40 to 80, where 40 is the least favored priority and 80 2610 // is the most favored." 2611 // 2612 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2613 // scheduling there; however, this still leaves iSeries.) 2614 // 2615 // We use the same values for AIX and PASE. 2616 int os::java_to_os_priority[CriticalPriority + 1] = { 2617 54, // 0 Entry should never be used 2618 2619 55, // 1 MinPriority 2620 55, // 2 2621 56, // 3 2622 2623 56, // 4 2624 57, // 5 NormPriority 2625 57, // 6 2626 2627 58, // 7 2628 58, // 8 2629 59, // 9 NearMaxPriority 2630 2631 60, // 10 MaxPriority 2632 2633 60 // 11 CriticalPriority 2634 }; 2635 2636 static int prio_init() { 2637 if (ThreadPriorityPolicy == 1) { 2638 if (geteuid() != 0) { 2639 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) { 2640 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \ 2641 "e.g., being the root user. If the necessary permission is not " \ 2642 "possessed, changes to priority will be silently ignored."); 2643 } 2644 } 2645 } 2646 if (UseCriticalJavaThreadPriority) { 2647 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority]; 2648 } 2649 return 0; 2650 } 2651 2652 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2653 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK; 2654 pthread_t thr = thread->osthread()->pthread_id(); 2655 int policy = SCHED_OTHER; 2656 struct sched_param param; 2657 param.sched_priority = newpri; 2658 int ret = pthread_setschedparam(thr, policy, ¶m); 2659 2660 if (ret != 0) { 2661 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2662 (int)thr, newpri, ret, os::errno_name(ret)); 2663 } 2664 return (ret == 0) ? OS_OK : OS_ERR; 2665 } 2666 2667 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2668 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) { 2669 *priority_ptr = java_to_os_priority[NormPriority]; 2670 return OS_OK; 2671 } 2672 pthread_t thr = thread->osthread()->pthread_id(); 2673 int policy = SCHED_OTHER; 2674 struct sched_param param; 2675 int ret = pthread_getschedparam(thr, &policy, ¶m); 2676 *priority_ptr = param.sched_priority; 2677 2678 return (ret == 0) ? OS_OK : OS_ERR; 2679 } 2680 2681 //////////////////////////////////////////////////////////////////////////////// 2682 // suspend/resume support 2683 2684 // The low-level signal-based suspend/resume support is a remnant from the 2685 // old VM-suspension that used to be for java-suspension, safepoints etc, 2686 // within hotspot. Currently used by JFR's OSThreadSampler 2687 // 2688 // The remaining code is greatly simplified from the more general suspension 2689 // code that used to be used. 2690 // 2691 // The protocol is quite simple: 2692 // - suspend: 2693 // - sends a signal to the target thread 2694 // - polls the suspend state of the osthread using a yield loop 2695 // - target thread signal handler (SR_handler) sets suspend state 2696 // and blocks in sigsuspend until continued 2697 // - resume: 2698 // - sets target osthread state to continue 2699 // - sends signal to end the sigsuspend loop in the SR_handler 2700 // 2701 // Note that the SR_lock plays no role in this suspend/resume protocol, 2702 // but is checked for NULL in SR_handler as a thread termination indicator. 2703 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2704 // 2705 // Note that resume_clear_context() and suspend_save_context() are needed 2706 // by SR_handler(), so that fetch_frame_from_context() works, 2707 // which in part is used by: 2708 // - Forte Analyzer: AsyncGetCallTrace() 2709 // - StackBanging: get_frame_at_stack_banging_point() 2710 2711 static void resume_clear_context(OSThread *osthread) { 2712 osthread->set_ucontext(NULL); 2713 osthread->set_siginfo(NULL); 2714 } 2715 2716 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2717 osthread->set_ucontext(context); 2718 osthread->set_siginfo(siginfo); 2719 } 2720 2721 // 2722 // Handler function invoked when a thread's execution is suspended or 2723 // resumed. We have to be careful that only async-safe functions are 2724 // called here (Note: most pthread functions are not async safe and 2725 // should be avoided.) 2726 // 2727 // Note: sigwait() is a more natural fit than sigsuspend() from an 2728 // interface point of view, but sigwait() prevents the signal hander 2729 // from being run. libpthread would get very confused by not having 2730 // its signal handlers run and prevents sigwait()'s use with the 2731 // mutex granting granting signal. 2732 // 2733 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2734 // 2735 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2736 // Save and restore errno to avoid confusing native code with EINTR 2737 // after sigsuspend. 2738 int old_errno = errno; 2739 2740 Thread* thread = Thread::current_or_null_safe(); 2741 assert(thread != NULL, "Missing current thread in SR_handler"); 2742 2743 // On some systems we have seen signal delivery get "stuck" until the signal 2744 // mask is changed as part of thread termination. Check that the current thread 2745 // has not already terminated (via SR_lock()) - else the following assertion 2746 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2747 // destructor has completed. 2748 2749 if (thread->SR_lock() == NULL) { 2750 return; 2751 } 2752 2753 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2754 2755 OSThread* osthread = thread->osthread(); 2756 2757 os::SuspendResume::State current = osthread->sr.state(); 2758 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2759 suspend_save_context(osthread, siginfo, context); 2760 2761 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2762 os::SuspendResume::State state = osthread->sr.suspended(); 2763 if (state == os::SuspendResume::SR_SUSPENDED) { 2764 sigset_t suspend_set; // signals for sigsuspend() 2765 sigemptyset(&suspend_set); 2766 // get current set of blocked signals and unblock resume signal 2767 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2768 sigdelset(&suspend_set, SR_signum); 2769 2770 // wait here until we are resumed 2771 while (1) { 2772 sigsuspend(&suspend_set); 2773 2774 os::SuspendResume::State result = osthread->sr.running(); 2775 if (result == os::SuspendResume::SR_RUNNING) { 2776 break; 2777 } 2778 } 2779 2780 } else if (state == os::SuspendResume::SR_RUNNING) { 2781 // request was cancelled, continue 2782 } else { 2783 ShouldNotReachHere(); 2784 } 2785 2786 resume_clear_context(osthread); 2787 } else if (current == os::SuspendResume::SR_RUNNING) { 2788 // request was cancelled, continue 2789 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2790 // ignore 2791 } else { 2792 ShouldNotReachHere(); 2793 } 2794 2795 errno = old_errno; 2796 } 2797 2798 static int SR_initialize() { 2799 struct sigaction act; 2800 char *s; 2801 // Get signal number to use for suspend/resume 2802 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2803 int sig = ::strtol(s, 0, 10); 2804 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2805 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2806 SR_signum = sig; 2807 } else { 2808 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2809 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2810 } 2811 } 2812 2813 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2814 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2815 2816 sigemptyset(&SR_sigset); 2817 sigaddset(&SR_sigset, SR_signum); 2818 2819 // Set up signal handler for suspend/resume. 2820 act.sa_flags = SA_RESTART|SA_SIGINFO; 2821 act.sa_handler = (void (*)(int)) SR_handler; 2822 2823 // SR_signum is blocked by default. 2824 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2825 2826 if (sigaction(SR_signum, &act, 0) == -1) { 2827 return -1; 2828 } 2829 2830 // Save signal flag 2831 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2832 return 0; 2833 } 2834 2835 static int SR_finalize() { 2836 return 0; 2837 } 2838 2839 static int sr_notify(OSThread* osthread) { 2840 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2841 assert_status(status == 0, status, "pthread_kill"); 2842 return status; 2843 } 2844 2845 // "Randomly" selected value for how long we want to spin 2846 // before bailing out on suspending a thread, also how often 2847 // we send a signal to a thread we want to resume 2848 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2849 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2850 2851 // returns true on success and false on error - really an error is fatal 2852 // but this seems the normal response to library errors 2853 static bool do_suspend(OSThread* osthread) { 2854 assert(osthread->sr.is_running(), "thread should be running"); 2855 // mark as suspended and send signal 2856 2857 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2858 // failed to switch, state wasn't running? 2859 ShouldNotReachHere(); 2860 return false; 2861 } 2862 2863 if (sr_notify(osthread) != 0) { 2864 // try to cancel, switch to running 2865 2866 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2867 if (result == os::SuspendResume::SR_RUNNING) { 2868 // cancelled 2869 return false; 2870 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2871 // somehow managed to suspend 2872 return true; 2873 } else { 2874 ShouldNotReachHere(); 2875 return false; 2876 } 2877 } 2878 2879 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2880 2881 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2882 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2883 os::naked_yield(); 2884 } 2885 2886 // timeout, try to cancel the request 2887 if (n >= RANDOMLY_LARGE_INTEGER) { 2888 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2889 if (cancelled == os::SuspendResume::SR_RUNNING) { 2890 return false; 2891 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2892 return true; 2893 } else { 2894 ShouldNotReachHere(); 2895 return false; 2896 } 2897 } 2898 } 2899 2900 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2901 return true; 2902 } 2903 2904 static void do_resume(OSThread* osthread) { 2905 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2906 2907 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2908 // failed to switch to WAKEUP_REQUEST 2909 ShouldNotReachHere(); 2910 return; 2911 } 2912 2913 while (!osthread->sr.is_running()) { 2914 if (sr_notify(osthread) == 0) { 2915 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2916 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2917 os::naked_yield(); 2918 } 2919 } 2920 } else { 2921 ShouldNotReachHere(); 2922 } 2923 } 2924 2925 guarantee(osthread->sr.is_running(), "Must be running!"); 2926 } 2927 2928 /////////////////////////////////////////////////////////////////////////////////// 2929 // signal handling (except suspend/resume) 2930 2931 // This routine may be used by user applications as a "hook" to catch signals. 2932 // The user-defined signal handler must pass unrecognized signals to this 2933 // routine, and if it returns true (non-zero), then the signal handler must 2934 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2935 // routine will never retun false (zero), but instead will execute a VM panic 2936 // routine kill the process. 2937 // 2938 // If this routine returns false, it is OK to call it again. This allows 2939 // the user-defined signal handler to perform checks either before or after 2940 // the VM performs its own checks. Naturally, the user code would be making 2941 // a serious error if it tried to handle an exception (such as a null check 2942 // or breakpoint) that the VM was generating for its own correct operation. 2943 // 2944 // This routine may recognize any of the following kinds of signals: 2945 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2946 // It should be consulted by handlers for any of those signals. 2947 // 2948 // The caller of this routine must pass in the three arguments supplied 2949 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2950 // field of the structure passed to sigaction(). This routine assumes that 2951 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2952 // 2953 // Note that the VM will print warnings if it detects conflicting signal 2954 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2955 // 2956 extern "C" JNIEXPORT int 2957 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 2958 2959 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 2960 // to be the thing to call; documentation is not terribly clear about whether 2961 // pthread_sigmask also works, and if it does, whether it does the same. 2962 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 2963 const int rc = ::pthread_sigmask(how, set, oset); 2964 // return value semantics differ slightly for error case: 2965 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 2966 // (so, pthread_sigmask is more theadsafe for error handling) 2967 // But success is always 0. 2968 return rc == 0 ? true : false; 2969 } 2970 2971 // Function to unblock all signals which are, according 2972 // to POSIX, typical program error signals. If they happen while being blocked, 2973 // they typically will bring down the process immediately. 2974 bool unblock_program_error_signals() { 2975 sigset_t set; 2976 ::sigemptyset(&set); 2977 ::sigaddset(&set, SIGILL); 2978 ::sigaddset(&set, SIGBUS); 2979 ::sigaddset(&set, SIGFPE); 2980 ::sigaddset(&set, SIGSEGV); 2981 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 2982 } 2983 2984 // Renamed from 'signalHandler' to avoid collision with other shared libs. 2985 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 2986 assert(info != NULL && uc != NULL, "it must be old kernel"); 2987 2988 // Never leave program error signals blocked; 2989 // on all our platforms they would bring down the process immediately when 2990 // getting raised while being blocked. 2991 unblock_program_error_signals(); 2992 2993 int orig_errno = errno; // Preserve errno value over signal handler. 2994 JVM_handle_aix_signal(sig, info, uc, true); 2995 errno = orig_errno; 2996 } 2997 2998 // This boolean allows users to forward their own non-matching signals 2999 // to JVM_handle_aix_signal, harmlessly. 3000 bool os::Aix::signal_handlers_are_installed = false; 3001 3002 // For signal-chaining 3003 bool os::Aix::libjsig_is_loaded = false; 3004 typedef struct sigaction *(*get_signal_t)(int); 3005 get_signal_t os::Aix::get_signal_action = NULL; 3006 3007 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3008 struct sigaction *actp = NULL; 3009 3010 if (libjsig_is_loaded) { 3011 // Retrieve the old signal handler from libjsig 3012 actp = (*get_signal_action)(sig); 3013 } 3014 if (actp == NULL) { 3015 // Retrieve the preinstalled signal handler from jvm 3016 actp = os::Posix::get_preinstalled_handler(sig); 3017 } 3018 3019 return actp; 3020 } 3021 3022 static bool call_chained_handler(struct sigaction *actp, int sig, 3023 siginfo_t *siginfo, void *context) { 3024 // Call the old signal handler 3025 if (actp->sa_handler == SIG_DFL) { 3026 // It's more reasonable to let jvm treat it as an unexpected exception 3027 // instead of taking the default action. 3028 return false; 3029 } else if (actp->sa_handler != SIG_IGN) { 3030 if ((actp->sa_flags & SA_NODEFER) == 0) { 3031 // automaticlly block the signal 3032 sigaddset(&(actp->sa_mask), sig); 3033 } 3034 3035 sa_handler_t hand = NULL; 3036 sa_sigaction_t sa = NULL; 3037 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3038 // retrieve the chained handler 3039 if (siginfo_flag_set) { 3040 sa = actp->sa_sigaction; 3041 } else { 3042 hand = actp->sa_handler; 3043 } 3044 3045 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3046 actp->sa_handler = SIG_DFL; 3047 } 3048 3049 // try to honor the signal mask 3050 sigset_t oset; 3051 sigemptyset(&oset); 3052 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3053 3054 // call into the chained handler 3055 if (siginfo_flag_set) { 3056 (*sa)(sig, siginfo, context); 3057 } else { 3058 (*hand)(sig); 3059 } 3060 3061 // restore the signal mask 3062 pthread_sigmask(SIG_SETMASK, &oset, NULL); 3063 } 3064 // Tell jvm's signal handler the signal is taken care of. 3065 return true; 3066 } 3067 3068 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3069 bool chained = false; 3070 // signal-chaining 3071 if (UseSignalChaining) { 3072 struct sigaction *actp = get_chained_signal_action(sig); 3073 if (actp != NULL) { 3074 chained = call_chained_handler(actp, sig, siginfo, context); 3075 } 3076 } 3077 return chained; 3078 } 3079 3080 // for diagnostic 3081 int sigflags[NSIG]; 3082 3083 int os::Aix::get_our_sigflags(int sig) { 3084 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3085 return sigflags[sig]; 3086 } 3087 3088 void os::Aix::set_our_sigflags(int sig, int flags) { 3089 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3090 if (sig > 0 && sig < NSIG) { 3091 sigflags[sig] = flags; 3092 } 3093 } 3094 3095 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3096 // Check for overwrite. 3097 struct sigaction oldAct; 3098 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3099 3100 void* oldhand = oldAct.sa_sigaction 3101 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3102 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3103 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3104 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3105 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3106 if (AllowUserSignalHandlers || !set_installed) { 3107 // Do not overwrite; user takes responsibility to forward to us. 3108 return; 3109 } else if (UseSignalChaining) { 3110 // save the old handler in jvm 3111 os::Posix::save_preinstalled_handler(sig, oldAct); 3112 // libjsig also interposes the sigaction() call below and saves the 3113 // old sigaction on it own. 3114 } else { 3115 fatal("Encountered unexpected pre-existing sigaction handler " 3116 "%#lx for signal %d.", (long)oldhand, sig); 3117 } 3118 } 3119 3120 struct sigaction sigAct; 3121 sigfillset(&(sigAct.sa_mask)); 3122 if (!set_installed) { 3123 sigAct.sa_handler = SIG_DFL; 3124 sigAct.sa_flags = SA_RESTART; 3125 } else { 3126 sigAct.sa_sigaction = javaSignalHandler; 3127 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3128 } 3129 // Save flags, which are set by ours 3130 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3131 sigflags[sig] = sigAct.sa_flags; 3132 3133 int ret = sigaction(sig, &sigAct, &oldAct); 3134 assert(ret == 0, "check"); 3135 3136 void* oldhand2 = oldAct.sa_sigaction 3137 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3138 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3139 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3140 } 3141 3142 // install signal handlers for signals that HotSpot needs to 3143 // handle in order to support Java-level exception handling. 3144 void os::Aix::install_signal_handlers() { 3145 if (!signal_handlers_are_installed) { 3146 signal_handlers_are_installed = true; 3147 3148 // signal-chaining 3149 typedef void (*signal_setting_t)(); 3150 signal_setting_t begin_signal_setting = NULL; 3151 signal_setting_t end_signal_setting = NULL; 3152 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3153 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3154 if (begin_signal_setting != NULL) { 3155 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3156 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3157 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3158 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3159 libjsig_is_loaded = true; 3160 assert(UseSignalChaining, "should enable signal-chaining"); 3161 } 3162 if (libjsig_is_loaded) { 3163 // Tell libjsig jvm is setting signal handlers. 3164 (*begin_signal_setting)(); 3165 } 3166 3167 set_signal_handler(SIGSEGV, true); 3168 set_signal_handler(SIGPIPE, true); 3169 set_signal_handler(SIGBUS, true); 3170 set_signal_handler(SIGILL, true); 3171 set_signal_handler(SIGFPE, true); 3172 set_signal_handler(SIGTRAP, true); 3173 set_signal_handler(SIGXFSZ, true); 3174 3175 if (libjsig_is_loaded) { 3176 // Tell libjsig jvm finishes setting signal handlers. 3177 (*end_signal_setting)(); 3178 } 3179 3180 // We don't activate signal checker if libjsig is in place, we trust ourselves 3181 // and if UserSignalHandler is installed all bets are off. 3182 // Log that signal checking is off only if -verbose:jni is specified. 3183 if (CheckJNICalls) { 3184 if (libjsig_is_loaded) { 3185 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3186 check_signals = false; 3187 } 3188 if (AllowUserSignalHandlers) { 3189 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3190 check_signals = false; 3191 } 3192 // Need to initialize check_signal_done. 3193 ::sigemptyset(&check_signal_done); 3194 } 3195 } 3196 } 3197 3198 static const char* get_signal_handler_name(address handler, 3199 char* buf, int buflen) { 3200 int offset; 3201 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3202 if (found) { 3203 // skip directory names 3204 const char *p1, *p2; 3205 p1 = buf; 3206 size_t len = strlen(os::file_separator()); 3207 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3208 // The way os::dll_address_to_library_name is implemented on Aix 3209 // right now, it always returns -1 for the offset which is not 3210 // terribly informative. 3211 // Will fix that. For now, omit the offset. 3212 jio_snprintf(buf, buflen, "%s", p1); 3213 } else { 3214 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3215 } 3216 return buf; 3217 } 3218 3219 static void print_signal_handler(outputStream* st, int sig, 3220 char* buf, size_t buflen) { 3221 struct sigaction sa; 3222 sigaction(sig, NULL, &sa); 3223 3224 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3225 3226 address handler = (sa.sa_flags & SA_SIGINFO) 3227 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3228 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3229 3230 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3231 st->print("SIG_DFL"); 3232 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3233 st->print("SIG_IGN"); 3234 } else { 3235 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3236 } 3237 3238 // Print readable mask. 3239 st->print(", sa_mask[0]="); 3240 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3241 3242 address rh = VMError::get_resetted_sighandler(sig); 3243 // May be, handler was resetted by VMError? 3244 if (rh != NULL) { 3245 handler = rh; 3246 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3247 } 3248 3249 // Print textual representation of sa_flags. 3250 st->print(", sa_flags="); 3251 os::Posix::print_sa_flags(st, sa.sa_flags); 3252 3253 // Check: is it our handler? 3254 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3255 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3256 // It is our signal handler. 3257 // Check for flags, reset system-used one! 3258 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3259 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3260 os::Aix::get_our_sigflags(sig)); 3261 } 3262 } 3263 st->cr(); 3264 } 3265 3266 #define DO_SIGNAL_CHECK(sig) \ 3267 if (!sigismember(&check_signal_done, sig)) \ 3268 os::Aix::check_signal_handler(sig) 3269 3270 // This method is a periodic task to check for misbehaving JNI applications 3271 // under CheckJNI, we can add any periodic checks here 3272 3273 void os::run_periodic_checks() { 3274 3275 if (check_signals == false) return; 3276 3277 // SEGV and BUS if overridden could potentially prevent 3278 // generation of hs*.log in the event of a crash, debugging 3279 // such a case can be very challenging, so we absolutely 3280 // check the following for a good measure: 3281 DO_SIGNAL_CHECK(SIGSEGV); 3282 DO_SIGNAL_CHECK(SIGILL); 3283 DO_SIGNAL_CHECK(SIGFPE); 3284 DO_SIGNAL_CHECK(SIGBUS); 3285 DO_SIGNAL_CHECK(SIGPIPE); 3286 DO_SIGNAL_CHECK(SIGXFSZ); 3287 if (UseSIGTRAP) { 3288 DO_SIGNAL_CHECK(SIGTRAP); 3289 } 3290 3291 // ReduceSignalUsage allows the user to override these handlers 3292 // see comments at the very top and jvm_md.h 3293 if (!ReduceSignalUsage) { 3294 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3295 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3296 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3297 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3298 } 3299 3300 DO_SIGNAL_CHECK(SR_signum); 3301 } 3302 3303 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3304 3305 static os_sigaction_t os_sigaction = NULL; 3306 3307 void os::Aix::check_signal_handler(int sig) { 3308 char buf[O_BUFLEN]; 3309 address jvmHandler = NULL; 3310 3311 struct sigaction act; 3312 if (os_sigaction == NULL) { 3313 // only trust the default sigaction, in case it has been interposed 3314 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3315 if (os_sigaction == NULL) return; 3316 } 3317 3318 os_sigaction(sig, (struct sigaction*)NULL, &act); 3319 3320 address thisHandler = (act.sa_flags & SA_SIGINFO) 3321 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3322 : CAST_FROM_FN_PTR(address, act.sa_handler); 3323 3324 switch(sig) { 3325 case SIGSEGV: 3326 case SIGBUS: 3327 case SIGFPE: 3328 case SIGPIPE: 3329 case SIGILL: 3330 case SIGXFSZ: 3331 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3332 break; 3333 3334 case SHUTDOWN1_SIGNAL: 3335 case SHUTDOWN2_SIGNAL: 3336 case SHUTDOWN3_SIGNAL: 3337 case BREAK_SIGNAL: 3338 jvmHandler = (address)user_handler(); 3339 break; 3340 3341 default: 3342 if (sig == SR_signum) { 3343 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3344 } else { 3345 return; 3346 } 3347 break; 3348 } 3349 3350 if (thisHandler != jvmHandler) { 3351 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3352 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3353 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3354 // No need to check this sig any longer 3355 sigaddset(&check_signal_done, sig); 3356 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3357 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3358 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3359 exception_name(sig, buf, O_BUFLEN)); 3360 } 3361 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3362 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3363 tty->print("expected:"); 3364 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3365 tty->cr(); 3366 tty->print(" found:"); 3367 os::Posix::print_sa_flags(tty, act.sa_flags); 3368 tty->cr(); 3369 // No need to check this sig any longer 3370 sigaddset(&check_signal_done, sig); 3371 } 3372 3373 // Dump all the signal 3374 if (sigismember(&check_signal_done, sig)) { 3375 print_signal_handlers(tty, buf, O_BUFLEN); 3376 } 3377 } 3378 3379 // To install functions for atexit system call 3380 extern "C" { 3381 static void perfMemory_exit_helper() { 3382 perfMemory_exit(); 3383 } 3384 } 3385 3386 // This is called _before_ the most of global arguments have been parsed. 3387 void os::init(void) { 3388 // This is basic, we want to know if that ever changes. 3389 // (Shared memory boundary is supposed to be a 256M aligned.) 3390 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3391 3392 // Record process break at startup. 3393 g_brk_at_startup = (address) ::sbrk(0); 3394 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3395 3396 // First off, we need to know whether we run on AIX or PASE, and 3397 // the OS level we run on. 3398 os::Aix::initialize_os_info(); 3399 3400 // Scan environment (SPEC1170 behaviour, etc). 3401 os::Aix::scan_environment(); 3402 3403 // Probe multipage support. 3404 query_multipage_support(); 3405 3406 // Act like we only have one page size by eliminating corner cases which 3407 // we did not support very well anyway. 3408 // We have two input conditions: 3409 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3410 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3411 // setting. 3412 // Data segment page size is important for us because it defines the thread stack page 3413 // size, which is needed for guard page handling, stack banging etc. 3414 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3415 // and should be allocated with 64k pages. 3416 // 3417 // So, we do the following: 3418 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3419 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3420 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3421 // 64k no --- AIX 5.2 ? --- 3422 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3423 3424 // We explicitly leave no option to change page size, because only upgrading would work, 3425 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3426 3427 if (g_multipage_support.datapsize == 4*K) { 3428 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3429 if (g_multipage_support.can_use_64K_pages) { 3430 // .. but we are able to use 64K pages dynamically. 3431 // This would be typical for java launchers which are not linked 3432 // with datapsize=64K (like, any other launcher but our own). 3433 // 3434 // In this case it would be smart to allocate the java heap with 64K 3435 // to get the performance benefit, and to fake 64k pages for the 3436 // data segment (when dealing with thread stacks). 3437 // 3438 // However, leave a possibility to downgrade to 4K, using 3439 // -XX:-Use64KPages. 3440 if (Use64KPages) { 3441 trcVerbose("64K page mode (faked for data segment)"); 3442 Aix::_page_size = 64*K; 3443 } else { 3444 trcVerbose("4K page mode (Use64KPages=off)"); 3445 Aix::_page_size = 4*K; 3446 } 3447 } else { 3448 // .. and not able to allocate 64k pages dynamically. Here, just 3449 // fall back to 4K paged mode and use mmap for everything. 3450 trcVerbose("4K page mode"); 3451 Aix::_page_size = 4*K; 3452 FLAG_SET_ERGO(Use64KPages, false); 3453 } 3454 } else { 3455 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3456 // This normally means that we can allocate 64k pages dynamically. 3457 // (There is one special case where this may be false: EXTSHM=on. 3458 // but we decided to not support that mode). 3459 assert0(g_multipage_support.can_use_64K_pages); 3460 Aix::_page_size = 64*K; 3461 trcVerbose("64K page mode"); 3462 FLAG_SET_ERGO(Use64KPages, true); 3463 } 3464 3465 // For now UseLargePages is just ignored. 3466 FLAG_SET_ERGO(UseLargePages, false); 3467 _page_sizes[0] = 0; 3468 3469 // debug trace 3470 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3471 3472 // Next, we need to initialize libo4 and libperfstat libraries. 3473 if (os::Aix::on_pase()) { 3474 os::Aix::initialize_libo4(); 3475 } else { 3476 os::Aix::initialize_libperfstat(); 3477 } 3478 3479 // Reset the perfstat information provided by ODM. 3480 if (os::Aix::on_aix()) { 3481 libperfstat::perfstat_reset(); 3482 } 3483 3484 // Now initialze basic system properties. Note that for some of the values we 3485 // need libperfstat etc. 3486 os::Aix::initialize_system_info(); 3487 3488 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3489 3490 init_random(1234567); 3491 3492 // _main_thread points to the thread that created/loaded the JVM. 3493 Aix::_main_thread = pthread_self(); 3494 3495 initial_time_count = javaTimeNanos(); 3496 3497 os::Posix::init(); 3498 } 3499 3500 // This is called _after_ the global arguments have been parsed. 3501 jint os::init_2(void) { 3502 3503 // This could be set after os::Posix::init() but all platforms 3504 // have to set it the same so we have to mirror Solaris. 3505 DEBUG_ONLY(os::set_mutex_init_done();) 3506 3507 os::Posix::init_2(); 3508 3509 if (os::Aix::on_pase()) { 3510 trcVerbose("Running on PASE."); 3511 } else { 3512 trcVerbose("Running on AIX (not PASE)."); 3513 } 3514 3515 trcVerbose("processor count: %d", os::_processor_count); 3516 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3517 3518 // Initially build up the loaded dll map. 3519 LoadedLibraries::reload(); 3520 if (Verbose) { 3521 trcVerbose("Loaded Libraries: "); 3522 LoadedLibraries::print(tty); 3523 } 3524 3525 // initialize suspend/resume support - must do this before signal_sets_init() 3526 if (SR_initialize() != 0) { 3527 perror("SR_initialize failed"); 3528 return JNI_ERR; 3529 } 3530 3531 Aix::signal_sets_init(); 3532 Aix::install_signal_handlers(); 3533 // Initialize data for jdk.internal.misc.Signal 3534 if (!ReduceSignalUsage) { 3535 jdk_misc_signal_init(); 3536 } 3537 3538 // Check and sets minimum stack sizes against command line options 3539 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3540 return JNI_ERR; 3541 } 3542 3543 // Not supported. 3544 FLAG_SET_ERGO(UseNUMA, false); 3545 FLAG_SET_ERGO(UseNUMAInterleaving, false); 3546 3547 if (MaxFDLimit) { 3548 // Set the number of file descriptors to max. print out error 3549 // if getrlimit/setrlimit fails but continue regardless. 3550 struct rlimit nbr_files; 3551 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3552 if (status != 0) { 3553 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3554 } else { 3555 nbr_files.rlim_cur = nbr_files.rlim_max; 3556 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3557 if (status != 0) { 3558 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3559 } 3560 } 3561 } 3562 3563 if (PerfAllowAtExitRegistration) { 3564 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3565 // At exit functions can be delayed until process exit time, which 3566 // can be problematic for embedded VM situations. Embedded VMs should 3567 // call DestroyJavaVM() to assure that VM resources are released. 3568 3569 // Note: perfMemory_exit_helper atexit function may be removed in 3570 // the future if the appropriate cleanup code can be added to the 3571 // VM_Exit VMOperation's doit method. 3572 if (atexit(perfMemory_exit_helper) != 0) { 3573 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3574 } 3575 } 3576 3577 // initialize thread priority policy 3578 prio_init(); 3579 3580 return JNI_OK; 3581 } 3582 3583 int os::active_processor_count() { 3584 // User has overridden the number of active processors 3585 if (ActiveProcessorCount > 0) { 3586 log_trace(os)("active_processor_count: " 3587 "active processor count set by user : %d", 3588 ActiveProcessorCount); 3589 return ActiveProcessorCount; 3590 } 3591 3592 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3593 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3594 return online_cpus; 3595 } 3596 3597 void os::set_native_thread_name(const char *name) { 3598 // Not yet implemented. 3599 return; 3600 } 3601 3602 bool os::bind_to_processor(uint processor_id) { 3603 // Not yet implemented. 3604 return false; 3605 } 3606 3607 void os::SuspendedThreadTask::internal_do_task() { 3608 if (do_suspend(_thread->osthread())) { 3609 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3610 do_task(context); 3611 do_resume(_thread->osthread()); 3612 } 3613 } 3614 3615 //////////////////////////////////////////////////////////////////////////////// 3616 // debug support 3617 3618 bool os::find(address addr, outputStream* st) { 3619 3620 st->print(PTR_FORMAT ": ", addr); 3621 3622 loaded_module_t lm; 3623 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3624 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3625 st->print_cr("%s", lm.path); 3626 return true; 3627 } 3628 3629 return false; 3630 } 3631 3632 //////////////////////////////////////////////////////////////////////////////// 3633 // misc 3634 3635 // This does not do anything on Aix. This is basically a hook for being 3636 // able to use structured exception handling (thread-local exception filters) 3637 // on, e.g., Win32. 3638 void 3639 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3640 JavaCallArguments* args, Thread* thread) { 3641 f(value, method, args, thread); 3642 } 3643 3644 void os::print_statistics() { 3645 } 3646 3647 bool os::message_box(const char* title, const char* message) { 3648 int i; 3649 fdStream err(defaultStream::error_fd()); 3650 for (i = 0; i < 78; i++) err.print_raw("="); 3651 err.cr(); 3652 err.print_raw_cr(title); 3653 for (i = 0; i < 78; i++) err.print_raw("-"); 3654 err.cr(); 3655 err.print_raw_cr(message); 3656 for (i = 0; i < 78; i++) err.print_raw("="); 3657 err.cr(); 3658 3659 char buf[16]; 3660 // Prevent process from exiting upon "read error" without consuming all CPU 3661 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3662 3663 return buf[0] == 'y' || buf[0] == 'Y'; 3664 } 3665 3666 // Is a (classpath) directory empty? 3667 bool os::dir_is_empty(const char* path) { 3668 DIR *dir = NULL; 3669 struct dirent *ptr; 3670 3671 dir = opendir(path); 3672 if (dir == NULL) return true; 3673 3674 /* Scan the directory */ 3675 bool result = true; 3676 while (result && (ptr = readdir(dir)) != NULL) { 3677 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3678 result = false; 3679 } 3680 } 3681 closedir(dir); 3682 return result; 3683 } 3684 3685 // This code originates from JDK's sysOpen and open64_w 3686 // from src/solaris/hpi/src/system_md.c 3687 3688 int os::open(const char *path, int oflag, int mode) { 3689 3690 if (strlen(path) > MAX_PATH - 1) { 3691 errno = ENAMETOOLONG; 3692 return -1; 3693 } 3694 // AIX 7.X now supports O_CLOEXEC too, like modern Linux; but we have to be careful, see 3695 // IV90804: OPENING A FILE IN AFS WITH O_CLOEXEC FAILS WITH AN EINVAL ERROR APPLIES TO AIX 7100-04 17/04/14 PTF PECHANGE 3696 int oflag_with_o_cloexec = oflag | O_CLOEXEC; 3697 3698 int fd = ::open64(path, oflag_with_o_cloexec, mode); 3699 if (fd == -1) { 3700 // we might fail in the open call when O_CLOEXEC is set, so try again without (see IV90804) 3701 fd = ::open64(path, oflag, mode); 3702 if (fd == -1) { 3703 return -1; 3704 } 3705 } 3706 3707 // If the open succeeded, the file might still be a directory. 3708 { 3709 struct stat64 buf64; 3710 int ret = ::fstat64(fd, &buf64); 3711 int st_mode = buf64.st_mode; 3712 3713 if (ret != -1) { 3714 if ((st_mode & S_IFMT) == S_IFDIR) { 3715 errno = EISDIR; 3716 ::close(fd); 3717 return -1; 3718 } 3719 } else { 3720 ::close(fd); 3721 return -1; 3722 } 3723 } 3724 3725 // All file descriptors that are opened in the JVM and not 3726 // specifically destined for a subprocess should have the 3727 // close-on-exec flag set. If we don't set it, then careless 3rd 3728 // party native code might fork and exec without closing all 3729 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3730 // UNIXProcess.c), and this in turn might: 3731 // 3732 // - cause end-of-file to fail to be detected on some file 3733 // descriptors, resulting in mysterious hangs, or 3734 // 3735 // - might cause an fopen in the subprocess to fail on a system 3736 // suffering from bug 1085341. 3737 3738 // Validate that the use of the O_CLOEXEC flag on open above worked. 3739 static sig_atomic_t O_CLOEXEC_is_known_to_work = 0; 3740 if (O_CLOEXEC_is_known_to_work == 0) { 3741 int flags = ::fcntl(fd, F_GETFD); 3742 if (flags != -1) { 3743 if ((flags & FD_CLOEXEC) != 0) { 3744 O_CLOEXEC_is_known_to_work = 1; 3745 } else { // it does not work 3746 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3747 O_CLOEXEC_is_known_to_work = -1; 3748 } 3749 } 3750 } else if (O_CLOEXEC_is_known_to_work == -1) { 3751 int flags = ::fcntl(fd, F_GETFD); 3752 if (flags != -1) { 3753 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3754 } 3755 } 3756 3757 return fd; 3758 } 3759 3760 // create binary file, rewriting existing file if required 3761 int os::create_binary_file(const char* path, bool rewrite_existing) { 3762 int oflags = O_WRONLY | O_CREAT; 3763 if (!rewrite_existing) { 3764 oflags |= O_EXCL; 3765 } 3766 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3767 } 3768 3769 // return current position of file pointer 3770 jlong os::current_file_offset(int fd) { 3771 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3772 } 3773 3774 // move file pointer to the specified offset 3775 jlong os::seek_to_file_offset(int fd, jlong offset) { 3776 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3777 } 3778 3779 // This code originates from JDK's sysAvailable 3780 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3781 3782 int os::available(int fd, jlong *bytes) { 3783 jlong cur, end; 3784 int mode; 3785 struct stat64 buf64; 3786 3787 if (::fstat64(fd, &buf64) >= 0) { 3788 mode = buf64.st_mode; 3789 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3790 int n; 3791 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3792 *bytes = n; 3793 return 1; 3794 } 3795 } 3796 } 3797 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3798 return 0; 3799 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3800 return 0; 3801 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3802 return 0; 3803 } 3804 *bytes = end - cur; 3805 return 1; 3806 } 3807 3808 // Map a block of memory. 3809 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3810 char *addr, size_t bytes, bool read_only, 3811 bool allow_exec) { 3812 int prot; 3813 int flags = MAP_PRIVATE; 3814 3815 if (read_only) { 3816 prot = PROT_READ; 3817 flags = MAP_SHARED; 3818 } else { 3819 prot = PROT_READ | PROT_WRITE; 3820 flags = MAP_PRIVATE; 3821 } 3822 3823 if (allow_exec) { 3824 prot |= PROT_EXEC; 3825 } 3826 3827 if (addr != NULL) { 3828 flags |= MAP_FIXED; 3829 } 3830 3831 // Allow anonymous mappings if 'fd' is -1. 3832 if (fd == -1) { 3833 flags |= MAP_ANONYMOUS; 3834 } 3835 3836 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3837 fd, file_offset); 3838 if (mapped_address == MAP_FAILED) { 3839 return NULL; 3840 } 3841 return mapped_address; 3842 } 3843 3844 // Remap a block of memory. 3845 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3846 char *addr, size_t bytes, bool read_only, 3847 bool allow_exec) { 3848 // same as map_memory() on this OS 3849 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3850 allow_exec); 3851 } 3852 3853 // Unmap a block of memory. 3854 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3855 return munmap(addr, bytes) == 0; 3856 } 3857 3858 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3859 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3860 // of a thread. 3861 // 3862 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3863 // the fast estimate available on the platform. 3864 3865 jlong os::current_thread_cpu_time() { 3866 // return user + sys since the cost is the same 3867 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3868 assert(n >= 0, "negative CPU time"); 3869 return n; 3870 } 3871 3872 jlong os::thread_cpu_time(Thread* thread) { 3873 // consistent with what current_thread_cpu_time() returns 3874 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3875 assert(n >= 0, "negative CPU time"); 3876 return n; 3877 } 3878 3879 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3880 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3881 assert(n >= 0, "negative CPU time"); 3882 return n; 3883 } 3884 3885 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3886 bool error = false; 3887 3888 jlong sys_time = 0; 3889 jlong user_time = 0; 3890 3891 // Reimplemented using getthrds64(). 3892 // 3893 // Works like this: 3894 // For the thread in question, get the kernel thread id. Then get the 3895 // kernel thread statistics using that id. 3896 // 3897 // This only works of course when no pthread scheduling is used, 3898 // i.e. there is a 1:1 relationship to kernel threads. 3899 // On AIX, see AIXTHREAD_SCOPE variable. 3900 3901 pthread_t pthtid = thread->osthread()->pthread_id(); 3902 3903 // retrieve kernel thread id for the pthread: 3904 tid64_t tid = 0; 3905 struct __pthrdsinfo pinfo; 3906 // I just love those otherworldly IBM APIs which force me to hand down 3907 // dummy buffers for stuff I dont care for... 3908 char dummy[1]; 3909 int dummy_size = sizeof(dummy); 3910 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3911 dummy, &dummy_size) == 0) { 3912 tid = pinfo.__pi_tid; 3913 } else { 3914 tty->print_cr("pthread_getthrds_np failed."); 3915 error = true; 3916 } 3917 3918 // retrieve kernel timing info for that kernel thread 3919 if (!error) { 3920 struct thrdentry64 thrdentry; 3921 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 3922 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 3923 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 3924 } else { 3925 tty->print_cr("pthread_getthrds_np failed."); 3926 error = true; 3927 } 3928 } 3929 3930 if (p_sys_time) { 3931 *p_sys_time = sys_time; 3932 } 3933 3934 if (p_user_time) { 3935 *p_user_time = user_time; 3936 } 3937 3938 if (error) { 3939 return false; 3940 } 3941 3942 return true; 3943 } 3944 3945 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3946 jlong sys_time; 3947 jlong user_time; 3948 3949 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 3950 return -1; 3951 } 3952 3953 return user_sys_cpu_time ? sys_time + user_time : user_time; 3954 } 3955 3956 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3957 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3958 info_ptr->may_skip_backward = false; // elapsed time not wall time 3959 info_ptr->may_skip_forward = false; // elapsed time not wall time 3960 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3961 } 3962 3963 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3964 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3965 info_ptr->may_skip_backward = false; // elapsed time not wall time 3966 info_ptr->may_skip_forward = false; // elapsed time not wall time 3967 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3968 } 3969 3970 bool os::is_thread_cpu_time_supported() { 3971 return true; 3972 } 3973 3974 // System loadavg support. Returns -1 if load average cannot be obtained. 3975 // For now just return the system wide load average (no processor sets). 3976 int os::loadavg(double values[], int nelem) { 3977 3978 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 3979 guarantee(values, "argument error"); 3980 3981 if (os::Aix::on_pase()) { 3982 3983 // AS/400 PASE: use libo4 porting library 3984 double v[3] = { 0.0, 0.0, 0.0 }; 3985 3986 if (libo4::get_load_avg(v, v + 1, v + 2)) { 3987 for (int i = 0; i < nelem; i ++) { 3988 values[i] = v[i]; 3989 } 3990 return nelem; 3991 } else { 3992 return -1; 3993 } 3994 3995 } else { 3996 3997 // AIX: use libperfstat 3998 libperfstat::cpuinfo_t ci; 3999 if (libperfstat::get_cpuinfo(&ci)) { 4000 for (int i = 0; i < nelem; i++) { 4001 values[i] = ci.loadavg[i]; 4002 } 4003 } else { 4004 return -1; 4005 } 4006 return nelem; 4007 } 4008 } 4009 4010 void os::pause() { 4011 char filename[MAX_PATH]; 4012 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4013 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4014 } else { 4015 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4016 } 4017 4018 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4019 if (fd != -1) { 4020 struct stat buf; 4021 ::close(fd); 4022 while (::stat(filename, &buf) == 0) { 4023 (void)::poll(NULL, 0, 100); 4024 } 4025 } else { 4026 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4027 } 4028 } 4029 4030 bool os::is_primordial_thread(void) { 4031 if (pthread_self() == (pthread_t)1) { 4032 return true; 4033 } else { 4034 return false; 4035 } 4036 } 4037 4038 // OS recognitions (PASE/AIX, OS level) call this before calling any 4039 // one of Aix::on_pase(), Aix::os_version() static 4040 void os::Aix::initialize_os_info() { 4041 4042 assert(_on_pase == -1 && _os_version == 0, "already called."); 4043 4044 struct utsname uts; 4045 memset(&uts, 0, sizeof(uts)); 4046 strcpy(uts.sysname, "?"); 4047 if (::uname(&uts) == -1) { 4048 trcVerbose("uname failed (%d)", errno); 4049 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4050 } else { 4051 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4052 "node \"%s\" machine \"%s\"\n", 4053 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4054 const int major = atoi(uts.version); 4055 assert(major > 0, "invalid OS version"); 4056 const int minor = atoi(uts.release); 4057 assert(minor > 0, "invalid OS release"); 4058 _os_version = (major << 24) | (minor << 16); 4059 char ver_str[20] = {0}; 4060 const char* name_str = "unknown OS"; 4061 if (strcmp(uts.sysname, "OS400") == 0) { 4062 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4063 _on_pase = 1; 4064 if (os_version_short() < 0x0504) { 4065 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4066 assert(false, "OS/400 release too old."); 4067 } 4068 name_str = "OS/400 (pase)"; 4069 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4070 } else if (strcmp(uts.sysname, "AIX") == 0) { 4071 // We run on AIX. We do not support versions older than AIX 7.1. 4072 _on_pase = 0; 4073 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4074 odmWrapper::determine_os_kernel_version(&_os_version); 4075 if (os_version_short() < 0x0701) { 4076 trcVerbose("AIX releases older than AIX 7.1 are not supported."); 4077 assert(false, "AIX release too old."); 4078 } 4079 name_str = "AIX"; 4080 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4081 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4082 } else { 4083 assert(false, "%s", name_str); 4084 } 4085 trcVerbose("We run on %s %s", name_str, ver_str); 4086 } 4087 4088 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4089 } // end: os::Aix::initialize_os_info() 4090 4091 // Scan environment for important settings which might effect the VM. 4092 // Trace out settings. Warn about invalid settings and/or correct them. 4093 // 4094 // Must run after os::Aix::initialue_os_info(). 4095 void os::Aix::scan_environment() { 4096 4097 char* p; 4098 int rc; 4099 4100 // Warn explicity if EXTSHM=ON is used. That switch changes how 4101 // System V shared memory behaves. One effect is that page size of 4102 // shared memory cannot be change dynamically, effectivly preventing 4103 // large pages from working. 4104 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4105 // recommendation is (in OSS notes) to switch it off. 4106 p = ::getenv("EXTSHM"); 4107 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4108 if (p && strcasecmp(p, "ON") == 0) { 4109 _extshm = 1; 4110 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4111 if (!AllowExtshm) { 4112 // We allow under certain conditions the user to continue. However, we want this 4113 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4114 // that the VM is not able to allocate 64k pages for the heap. 4115 // We do not want to run with reduced performance. 4116 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4117 } 4118 } else { 4119 _extshm = 0; 4120 } 4121 4122 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4123 // Not tested, not supported. 4124 // 4125 // Note that it might be worth the trouble to test and to require it, if only to 4126 // get useful return codes for mprotect. 4127 // 4128 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4129 // exec() ? before loading the libjvm ? ....) 4130 p = ::getenv("XPG_SUS_ENV"); 4131 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4132 if (p && strcmp(p, "ON") == 0) { 4133 _xpg_sus_mode = 1; 4134 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4135 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4136 // clobber address ranges. If we ever want to support that, we have to do some 4137 // testing first. 4138 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4139 } else { 4140 _xpg_sus_mode = 0; 4141 } 4142 4143 if (os::Aix::on_pase()) { 4144 p = ::getenv("QIBM_MULTI_THREADED"); 4145 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4146 } 4147 4148 p = ::getenv("LDR_CNTRL"); 4149 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4150 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4151 if (p && ::strstr(p, "TEXTPSIZE")) { 4152 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4153 "you may experience hangs or crashes on OS/400 V7R1."); 4154 } 4155 } 4156 4157 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4158 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4159 4160 } // end: os::Aix::scan_environment() 4161 4162 // PASE: initialize the libo4 library (PASE porting library). 4163 void os::Aix::initialize_libo4() { 4164 guarantee(os::Aix::on_pase(), "OS/400 only."); 4165 if (!libo4::init()) { 4166 trcVerbose("libo4 initialization failed."); 4167 assert(false, "libo4 initialization failed"); 4168 } else { 4169 trcVerbose("libo4 initialized."); 4170 } 4171 } 4172 4173 // AIX: initialize the libperfstat library. 4174 void os::Aix::initialize_libperfstat() { 4175 assert(os::Aix::on_aix(), "AIX only"); 4176 if (!libperfstat::init()) { 4177 trcVerbose("libperfstat initialization failed."); 4178 assert(false, "libperfstat initialization failed"); 4179 } else { 4180 trcVerbose("libperfstat initialized."); 4181 } 4182 } 4183 4184 ///////////////////////////////////////////////////////////////////////////// 4185 // thread stack 4186 4187 // Get the current stack base from the OS (actually, the pthread library). 4188 // Note: usually not page aligned. 4189 address os::current_stack_base() { 4190 AixMisc::stackbounds_t bounds; 4191 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4192 guarantee(rc, "Unable to retrieve stack bounds."); 4193 return bounds.base; 4194 } 4195 4196 // Get the current stack size from the OS (actually, the pthread library). 4197 // Returned size is such that (base - size) is always aligned to page size. 4198 size_t os::current_stack_size() { 4199 AixMisc::stackbounds_t bounds; 4200 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4201 guarantee(rc, "Unable to retrieve stack bounds."); 4202 // Align the returned stack size such that the stack low address 4203 // is aligned to page size (Note: base is usually not and we do not care). 4204 // We need to do this because caller code will assume stack low address is 4205 // page aligned and will place guard pages without checking. 4206 address low = bounds.base - bounds.size; 4207 address low_aligned = (address)align_up(low, os::vm_page_size()); 4208 size_t s = bounds.base - low_aligned; 4209 return s; 4210 } 4211 4212 extern char** environ; 4213 4214 // Run the specified command in a separate process. Return its exit value, 4215 // or -1 on failure (e.g. can't fork a new process). 4216 // Unlike system(), this function can be called from signal handler. It 4217 // doesn't block SIGINT et al. 4218 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 4219 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL}; 4220 4221 pid_t pid = fork(); 4222 4223 if (pid < 0) { 4224 // fork failed 4225 return -1; 4226 4227 } else if (pid == 0) { 4228 // child process 4229 4230 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4231 execve("/usr/bin/sh", argv, environ); 4232 4233 // execve failed 4234 _exit(-1); 4235 4236 } else { 4237 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4238 // care about the actual exit code, for now. 4239 4240 int status; 4241 4242 // Wait for the child process to exit. This returns immediately if 4243 // the child has already exited. */ 4244 while (waitpid(pid, &status, 0) < 0) { 4245 switch (errno) { 4246 case ECHILD: return 0; 4247 case EINTR: break; 4248 default: return -1; 4249 } 4250 } 4251 4252 if (WIFEXITED(status)) { 4253 // The child exited normally; get its exit code. 4254 return WEXITSTATUS(status); 4255 } else if (WIFSIGNALED(status)) { 4256 // The child exited because of a signal. 4257 // The best value to return is 0x80 + signal number, 4258 // because that is what all Unix shells do, and because 4259 // it allows callers to distinguish between process exit and 4260 // process death by signal. 4261 return 0x80 + WTERMSIG(status); 4262 } else { 4263 // Unknown exit code; pass it through. 4264 return status; 4265 } 4266 } 4267 return -1; 4268 } 4269 4270 // Get the default path to the core file 4271 // Returns the length of the string 4272 int os::get_core_path(char* buffer, size_t bufferSize) { 4273 const char* p = get_current_directory(buffer, bufferSize); 4274 4275 if (p == NULL) { 4276 assert(p != NULL, "failed to get current directory"); 4277 return 0; 4278 } 4279 4280 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4281 p, current_process_id()); 4282 4283 return strlen(buffer); 4284 } 4285 4286 #ifndef PRODUCT 4287 void TestReserveMemorySpecial_test() { 4288 // No tests available for this platform 4289 } 4290 #endif 4291 4292 bool os::start_debugging(char *buf, int buflen) { 4293 int len = (int)strlen(buf); 4294 char *p = &buf[len]; 4295 4296 jio_snprintf(p, buflen -len, 4297 "\n\n" 4298 "Do you want to debug the problem?\n\n" 4299 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4300 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4301 "Otherwise, press RETURN to abort...", 4302 os::current_process_id(), 4303 os::current_thread_id(), thread_self()); 4304 4305 bool yes = os::message_box("Unexpected Error", buf); 4306 4307 if (yes) { 4308 // yes, user asked VM to launch debugger 4309 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4310 4311 os::fork_and_exec(buf); 4312 yes = false; 4313 } 4314 return yes; 4315 } 4316 4317 static inline time_t get_mtime(const char* filename) { 4318 struct stat st; 4319 int ret = os::stat(filename, &st); 4320 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 4321 return st.st_mtime; 4322 } 4323 4324 int os::compare_file_modified_times(const char* file1, const char* file2) { 4325 time_t t1 = get_mtime(file1); 4326 time_t t2 = get_mtime(file2); 4327 return t1 - t2; 4328 } 4329 4330 bool os::supports_map_sync() { 4331 return false; 4332 }