1 /* 2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2019 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 // According to the AIX OS doc #pragma alloca must be used 27 // with C++ compiler before referencing the function alloca() 28 #pragma alloca 29 30 // no precompiled headers 31 #include "jvm.h" 32 #include "classfile/classLoader.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmSymbols.hpp" 35 #include "code/icBuffer.hpp" 36 #include "code/vtableStubs.hpp" 37 #include "compiler/compileBroker.hpp" 38 #include "interpreter/interpreter.hpp" 39 #include "logging/log.hpp" 40 #include "logging/logStream.hpp" 41 #include "libo4.hpp" 42 #include "libperfstat_aix.hpp" 43 #include "libodm_aix.hpp" 44 #include "loadlib_aix.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/filemap.hpp" 47 #include "misc_aix.hpp" 48 #include "oops/oop.inline.hpp" 49 #include "os_aix.inline.hpp" 50 #include "os_share_aix.hpp" 51 #include "porting_aix.hpp" 52 #include "prims/jniFastGetField.hpp" 53 #include "prims/jvm_misc.hpp" 54 #include "runtime/arguments.hpp" 55 #include "runtime/atomic.hpp" 56 #include "runtime/extendedPC.hpp" 57 #include "runtime/globals.hpp" 58 #include "runtime/interfaceSupport.inline.hpp" 59 #include "runtime/java.hpp" 60 #include "runtime/javaCalls.hpp" 61 #include "runtime/mutexLocker.hpp" 62 #include "runtime/objectMonitor.hpp" 63 #include "runtime/orderAccess.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/osThread.hpp" 66 #include "runtime/perfMemory.hpp" 67 #include "runtime/sharedRuntime.hpp" 68 #include "runtime/statSampler.hpp" 69 #include "runtime/stubRoutines.hpp" 70 #include "runtime/thread.inline.hpp" 71 #include "runtime/threadCritical.hpp" 72 #include "runtime/timer.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "services/attachListener.hpp" 75 #include "services/runtimeService.hpp" 76 #include "utilities/align.hpp" 77 #include "utilities/decoder.hpp" 78 #include "utilities/defaultStream.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/growableArray.hpp" 81 #include "utilities/vmError.hpp" 82 83 // put OS-includes here (sorted alphabetically) 84 #include <errno.h> 85 #include <fcntl.h> 86 #include <inttypes.h> 87 #include <poll.h> 88 #include <procinfo.h> 89 #include <pthread.h> 90 #include <pwd.h> 91 #include <semaphore.h> 92 #include <signal.h> 93 #include <stdint.h> 94 #include <stdio.h> 95 #include <string.h> 96 #include <unistd.h> 97 #include <sys/ioctl.h> 98 #include <sys/ipc.h> 99 #include <sys/mman.h> 100 #include <sys/resource.h> 101 #include <sys/select.h> 102 #include <sys/shm.h> 103 #include <sys/socket.h> 104 #include <sys/stat.h> 105 #include <sys/sysinfo.h> 106 #include <sys/systemcfg.h> 107 #include <sys/time.h> 108 #include <sys/times.h> 109 #include <sys/types.h> 110 #include <sys/utsname.h> 111 #include <sys/vminfo.h> 112 #include <sys/wait.h> 113 114 // Missing prototypes for various system APIs. 115 extern "C" 116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); 117 118 #if !defined(_AIXVERSION_610) 119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int); 120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int); 121 extern "C" int getargs(procsinfo*, int, char*, int); 122 #endif 123 124 #define MAX_PATH (2 * K) 125 126 // for timer info max values which include all bits 127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 128 // for multipage initialization error analysis (in 'g_multipage_error') 129 #define ERROR_MP_OS_TOO_OLD 100 130 #define ERROR_MP_EXTSHM_ACTIVE 101 131 #define ERROR_MP_VMGETINFO_FAILED 102 132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 133 134 // excerpts from systemcfg.h that might be missing on older os levels 135 #ifndef PV_5_Compat 136 #define PV_5_Compat 0x0F8000 /* Power PC 5 */ 137 #endif 138 #ifndef PV_6 139 #define PV_6 0x100000 /* Power PC 6 */ 140 #endif 141 #ifndef PV_6_1 142 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */ 143 #endif 144 #ifndef PV_6_Compat 145 #define PV_6_Compat 0x108000 /* Power PC 6 */ 146 #endif 147 #ifndef PV_7 148 #define PV_7 0x200000 /* Power PC 7 */ 149 #endif 150 #ifndef PV_7_Compat 151 #define PV_7_Compat 0x208000 /* Power PC 7 */ 152 #endif 153 #ifndef PV_8 154 #define PV_8 0x300000 /* Power PC 8 */ 155 #endif 156 #ifndef PV_8_Compat 157 #define PV_8_Compat 0x308000 /* Power PC 8 */ 158 #endif 159 160 static address resolve_function_descriptor_to_code_pointer(address p); 161 162 static void vmembk_print_on(outputStream* os); 163 164 //////////////////////////////////////////////////////////////////////////////// 165 // global variables (for a description see os_aix.hpp) 166 167 julong os::Aix::_physical_memory = 0; 168 169 pthread_t os::Aix::_main_thread = ((pthread_t)0); 170 int os::Aix::_page_size = -1; 171 172 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase 173 int os::Aix::_on_pase = -1; 174 175 // 0 = uninitialized, otherwise 32 bit number: 176 // 0xVVRRTTSS 177 // VV - major version 178 // RR - minor version 179 // TT - tech level, if known, 0 otherwise 180 // SS - service pack, if known, 0 otherwise 181 uint32_t os::Aix::_os_version = 0; 182 183 // -1 = uninitialized, 0 - no, 1 - yes 184 int os::Aix::_xpg_sus_mode = -1; 185 186 // -1 = uninitialized, 0 - no, 1 - yes 187 int os::Aix::_extshm = -1; 188 189 //////////////////////////////////////////////////////////////////////////////// 190 // local variables 191 192 static volatile jlong max_real_time = 0; 193 static jlong initial_time_count = 0; 194 static int clock_tics_per_sec = 100; 195 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) 196 static bool check_signals = true; 197 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) 198 static sigset_t SR_sigset; 199 200 // Process break recorded at startup. 201 static address g_brk_at_startup = NULL; 202 203 // This describes the state of multipage support of the underlying 204 // OS. Note that this is of no interest to the outsize world and 205 // therefore should not be defined in AIX class. 206 // 207 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The 208 // latter two (16M "large" resp. 16G "huge" pages) require special 209 // setup and are normally not available. 210 // 211 // AIX supports multiple page sizes per process, for: 212 // - Stack (of the primordial thread, so not relevant for us) 213 // - Data - data, bss, heap, for us also pthread stacks 214 // - Text - text code 215 // - shared memory 216 // 217 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) 218 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...). 219 // 220 // For shared memory, page size can be set dynamically via 221 // shmctl(). Different shared memory regions can have different page 222 // sizes. 223 // 224 // More information can be found at AIBM info center: 225 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm 226 // 227 static struct { 228 size_t pagesize; // sysconf _SC_PAGESIZE (4K) 229 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE) 230 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE) 231 size_t pthr_stack_pagesize; // stack page size of pthread threads 232 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE) 233 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm. 234 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm. 235 int error; // Error describing if something went wrong at multipage init. 236 } g_multipage_support = { 237 (size_t) -1, 238 (size_t) -1, 239 (size_t) -1, 240 (size_t) -1, 241 (size_t) -1, 242 false, false, 243 0 244 }; 245 246 // We must not accidentally allocate memory close to the BRK - even if 247 // that would work - because then we prevent the BRK segment from 248 // growing which may result in a malloc OOM even though there is 249 // enough memory. The problem only arises if we shmat() or mmap() at 250 // a specific wish address, e.g. to place the heap in a 251 // compressed-oops-friendly way. 252 static bool is_close_to_brk(address a) { 253 assert0(g_brk_at_startup != NULL); 254 if (a >= g_brk_at_startup && 255 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) { 256 return true; 257 } 258 return false; 259 } 260 261 julong os::available_memory() { 262 return Aix::available_memory(); 263 } 264 265 julong os::Aix::available_memory() { 266 // Avoid expensive API call here, as returned value will always be null. 267 if (os::Aix::on_pase()) { 268 return 0x0LL; 269 } 270 os::Aix::meminfo_t mi; 271 if (os::Aix::get_meminfo(&mi)) { 272 return mi.real_free; 273 } else { 274 return ULONG_MAX; 275 } 276 } 277 278 julong os::physical_memory() { 279 return Aix::physical_memory(); 280 } 281 282 // Return true if user is running as root. 283 284 bool os::have_special_privileges() { 285 static bool init = false; 286 static bool privileges = false; 287 if (!init) { 288 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 289 init = true; 290 } 291 return privileges; 292 } 293 294 // Helper function, emulates disclaim64 using multiple 32bit disclaims 295 // because we cannot use disclaim64() on AS/400 and old AIX releases. 296 static bool my_disclaim64(char* addr, size_t size) { 297 298 if (size == 0) { 299 return true; 300 } 301 302 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) 303 const unsigned int maxDisclaimSize = 0x40000000; 304 305 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); 306 const unsigned int lastDisclaimSize = (size % maxDisclaimSize); 307 308 char* p = addr; 309 310 for (int i = 0; i < numFullDisclaimsNeeded; i ++) { 311 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 312 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); 313 return false; 314 } 315 p += maxDisclaimSize; 316 } 317 318 if (lastDisclaimSize > 0) { 319 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 320 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); 321 return false; 322 } 323 } 324 325 return true; 326 } 327 328 // Cpu architecture string 329 #if defined(PPC32) 330 static char cpu_arch[] = "ppc"; 331 #elif defined(PPC64) 332 static char cpu_arch[] = "ppc64"; 333 #else 334 #error Add appropriate cpu_arch setting 335 #endif 336 337 // Wrap the function "vmgetinfo" which is not available on older OS releases. 338 static int checked_vmgetinfo(void *out, int command, int arg) { 339 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 340 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1"); 341 } 342 return ::vmgetinfo(out, command, arg); 343 } 344 345 // Given an address, returns the size of the page backing that address. 346 size_t os::Aix::query_pagesize(void* addr) { 347 348 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 349 // AS/400 older than V6R1: no vmgetinfo here, default to 4K 350 return 4*K; 351 } 352 353 vm_page_info pi; 354 pi.addr = (uint64_t)addr; 355 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { 356 return pi.pagesize; 357 } else { 358 assert(false, "vmgetinfo failed to retrieve page size"); 359 return 4*K; 360 } 361 } 362 363 void os::Aix::initialize_system_info() { 364 365 // Get the number of online(logical) cpus instead of configured. 366 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); 367 assert(_processor_count > 0, "_processor_count must be > 0"); 368 369 // Retrieve total physical storage. 370 os::Aix::meminfo_t mi; 371 if (!os::Aix::get_meminfo(&mi)) { 372 assert(false, "os::Aix::get_meminfo failed."); 373 } 374 _physical_memory = (julong) mi.real_total; 375 } 376 377 // Helper function for tracing page sizes. 378 static const char* describe_pagesize(size_t pagesize) { 379 switch (pagesize) { 380 case 4*K : return "4K"; 381 case 64*K: return "64K"; 382 case 16*M: return "16M"; 383 case 16*G: return "16G"; 384 default: 385 assert(false, "surprise"); 386 return "??"; 387 } 388 } 389 390 // Probe OS for multipage support. 391 // Will fill the global g_multipage_support structure. 392 // Must be called before calling os::large_page_init(). 393 static void query_multipage_support() { 394 395 guarantee(g_multipage_support.pagesize == -1, 396 "do not call twice"); 397 398 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE); 399 400 // This really would surprise me. 401 assert(g_multipage_support.pagesize == 4*K, "surprise!"); 402 403 // Query default data page size (default page size for C-Heap, pthread stacks and .bss). 404 // Default data page size is defined either by linker options (-bdatapsize) 405 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, 406 // default should be 4K. 407 { 408 void* p = ::malloc(16*M); 409 g_multipage_support.datapsize = os::Aix::query_pagesize(p); 410 ::free(p); 411 } 412 413 // Query default shm page size (LDR_CNTRL SHMPSIZE). 414 // Note that this is pure curiosity. We do not rely on default page size but set 415 // our own page size after allocated. 416 { 417 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); 418 guarantee(shmid != -1, "shmget failed"); 419 void* p = ::shmat(shmid, NULL, 0); 420 ::shmctl(shmid, IPC_RMID, NULL); 421 guarantee(p != (void*) -1, "shmat failed"); 422 g_multipage_support.shmpsize = os::Aix::query_pagesize(p); 423 ::shmdt(p); 424 } 425 426 // Before querying the stack page size, make sure we are not running as primordial 427 // thread (because primordial thread's stack may have different page size than 428 // pthread thread stacks). Running a VM on the primordial thread won't work for a 429 // number of reasons so we may just as well guarantee it here. 430 guarantee0(!os::is_primordial_thread()); 431 432 // Query pthread stack page size. Should be the same as data page size because 433 // pthread stacks are allocated from C-Heap. 434 { 435 int dummy = 0; 436 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy); 437 } 438 439 // Query default text page size (LDR_CNTRL TEXTPSIZE). 440 { 441 address any_function = 442 resolve_function_descriptor_to_code_pointer((address)describe_pagesize); 443 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function); 444 } 445 446 // Now probe for support of 64K pages and 16M pages. 447 448 // Before OS/400 V6R1, there is no support for pages other than 4K. 449 if (os::Aix::on_pase_V5R4_or_older()) { 450 trcVerbose("OS/400 < V6R1 - no large page support."); 451 g_multipage_support.error = ERROR_MP_OS_TOO_OLD; 452 goto query_multipage_support_end; 453 } 454 455 // Now check which page sizes the OS claims it supports, and of those, which actually can be used. 456 { 457 const int MAX_PAGE_SIZES = 4; 458 psize_t sizes[MAX_PAGE_SIZES]; 459 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); 460 if (num_psizes == -1) { 461 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno); 462 trcVerbose("disabling multipage support."); 463 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED; 464 goto query_multipage_support_end; 465 } 466 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); 467 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); 468 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); 469 for (int i = 0; i < num_psizes; i ++) { 470 trcVerbose(" %s ", describe_pagesize(sizes[i])); 471 } 472 473 // Can we use 64K, 16M pages? 474 for (int i = 0; i < num_psizes; i ++) { 475 const size_t pagesize = sizes[i]; 476 if (pagesize != 64*K && pagesize != 16*M) { 477 continue; 478 } 479 bool can_use = false; 480 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize)); 481 const int shmid = ::shmget(IPC_PRIVATE, pagesize, 482 IPC_CREAT | S_IRUSR | S_IWUSR); 483 guarantee0(shmid != -1); // Should always work. 484 // Try to set pagesize. 485 struct shmid_ds shm_buf = { 0 }; 486 shm_buf.shm_pagesize = pagesize; 487 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) { 488 const int en = errno; 489 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 490 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno); 491 } else { 492 // Attach and double check pageisze. 493 void* p = ::shmat(shmid, NULL, 0); 494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 495 guarantee0(p != (void*) -1); // Should always work. 496 const size_t real_pagesize = os::Aix::query_pagesize(p); 497 if (real_pagesize != pagesize) { 498 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize); 499 } else { 500 can_use = true; 501 } 502 ::shmdt(p); 503 } 504 trcVerbose("Can use: %s", (can_use ? "yes" : "no")); 505 if (pagesize == 64*K) { 506 g_multipage_support.can_use_64K_pages = can_use; 507 } else if (pagesize == 16*M) { 508 g_multipage_support.can_use_16M_pages = can_use; 509 } 510 } 511 512 } // end: check which pages can be used for shared memory 513 514 query_multipage_support_end: 515 516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s", 517 describe_pagesize(g_multipage_support.pagesize)); 518 trcVerbose("Data page size (C-Heap, bss, etc): %s", 519 describe_pagesize(g_multipage_support.datapsize)); 520 trcVerbose("Text page size: %s", 521 describe_pagesize(g_multipage_support.textpsize)); 522 trcVerbose("Thread stack page size (pthread): %s", 523 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 524 trcVerbose("Default shared memory page size: %s", 525 describe_pagesize(g_multipage_support.shmpsize)); 526 trcVerbose("Can use 64K pages dynamically with shared memory: %s", 527 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 528 trcVerbose("Can use 16M pages dynamically with shared memory: %s", 529 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 530 trcVerbose("Multipage error details: %d", 531 g_multipage_support.error); 532 533 // sanity checks 534 assert0(g_multipage_support.pagesize == 4*K); 535 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K); 536 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K); 537 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize); 538 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K); 539 540 } 541 542 void os::init_system_properties_values() { 543 544 #ifndef OVERRIDE_LIBPATH 545 #define DEFAULT_LIBPATH "/lib:/usr/lib" 546 #else 547 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH 548 #endif 549 #define EXTENSIONS_DIR "/lib/ext" 550 551 // Buffer that fits several sprintfs. 552 // Note that the space for the trailing null is provided 553 // by the nulls included by the sizeof operator. 554 const size_t bufsize = 555 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 556 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir 557 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 558 559 // sysclasspath, java_home, dll_dir 560 { 561 char *pslash; 562 os::jvm_path(buf, bufsize); 563 564 // Found the full path to libjvm.so. 565 // Now cut the path to <java_home>/jre if we can. 566 pslash = strrchr(buf, '/'); 567 if (pslash != NULL) { 568 *pslash = '\0'; // Get rid of /libjvm.so. 569 } 570 pslash = strrchr(buf, '/'); 571 if (pslash != NULL) { 572 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 573 } 574 Arguments::set_dll_dir(buf); 575 576 if (pslash != NULL) { 577 pslash = strrchr(buf, '/'); 578 if (pslash != NULL) { 579 *pslash = '\0'; // Get rid of /lib. 580 } 581 } 582 Arguments::set_java_home(buf); 583 if (!set_boot_path('/', ':')) { 584 vm_exit_during_initialization("Failed setting boot class path.", NULL); 585 } 586 } 587 588 // Where to look for native libraries. 589 590 // On Aix we get the user setting of LIBPATH. 591 // Eventually, all the library path setting will be done here. 592 // Get the user setting of LIBPATH. 593 const char *v = ::getenv("LIBPATH"); 594 const char *v_colon = ":"; 595 if (v == NULL) { v = ""; v_colon = ""; } 596 597 // Concatenate user and invariant part of ld_library_path. 598 // That's +1 for the colon and +1 for the trailing '\0'. 599 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal); 600 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon); 601 Arguments::set_library_path(ld_library_path); 602 FREE_C_HEAP_ARRAY(char, ld_library_path); 603 604 // Extensions directories. 605 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); 606 Arguments::set_ext_dirs(buf); 607 608 FREE_C_HEAP_ARRAY(char, buf); 609 610 #undef DEFAULT_LIBPATH 611 #undef EXTENSIONS_DIR 612 } 613 614 //////////////////////////////////////////////////////////////////////////////// 615 // breakpoint support 616 617 void os::breakpoint() { 618 BREAKPOINT; 619 } 620 621 extern "C" void breakpoint() { 622 // use debugger to set breakpoint here 623 } 624 625 //////////////////////////////////////////////////////////////////////////////// 626 // signal support 627 628 debug_only(static bool signal_sets_initialized = false); 629 static sigset_t unblocked_sigs, vm_sigs; 630 631 void os::Aix::signal_sets_init() { 632 // Should also have an assertion stating we are still single-threaded. 633 assert(!signal_sets_initialized, "Already initialized"); 634 // Fill in signals that are necessarily unblocked for all threads in 635 // the VM. Currently, we unblock the following signals: 636 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 637 // by -Xrs (=ReduceSignalUsage)); 638 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 639 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 640 // the dispositions or masks wrt these signals. 641 // Programs embedding the VM that want to use the above signals for their 642 // own purposes must, at this time, use the "-Xrs" option to prevent 643 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 644 // (See bug 4345157, and other related bugs). 645 // In reality, though, unblocking these signals is really a nop, since 646 // these signals are not blocked by default. 647 sigemptyset(&unblocked_sigs); 648 sigaddset(&unblocked_sigs, SIGILL); 649 sigaddset(&unblocked_sigs, SIGSEGV); 650 sigaddset(&unblocked_sigs, SIGBUS); 651 sigaddset(&unblocked_sigs, SIGFPE); 652 sigaddset(&unblocked_sigs, SIGTRAP); 653 sigaddset(&unblocked_sigs, SR_signum); 654 655 if (!ReduceSignalUsage) { 656 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 657 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 658 } 659 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 660 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 661 } 662 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 663 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 664 } 665 } 666 // Fill in signals that are blocked by all but the VM thread. 667 sigemptyset(&vm_sigs); 668 if (!ReduceSignalUsage) 669 sigaddset(&vm_sigs, BREAK_SIGNAL); 670 debug_only(signal_sets_initialized = true); 671 } 672 673 // These are signals that are unblocked while a thread is running Java. 674 // (For some reason, they get blocked by default.) 675 sigset_t* os::Aix::unblocked_signals() { 676 assert(signal_sets_initialized, "Not initialized"); 677 return &unblocked_sigs; 678 } 679 680 // These are the signals that are blocked while a (non-VM) thread is 681 // running Java. Only the VM thread handles these signals. 682 sigset_t* os::Aix::vm_signals() { 683 assert(signal_sets_initialized, "Not initialized"); 684 return &vm_sigs; 685 } 686 687 void os::Aix::hotspot_sigmask(Thread* thread) { 688 689 //Save caller's signal mask before setting VM signal mask 690 sigset_t caller_sigmask; 691 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 692 693 OSThread* osthread = thread->osthread(); 694 osthread->set_caller_sigmask(caller_sigmask); 695 696 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); 697 698 if (!ReduceSignalUsage) { 699 if (thread->is_VM_thread()) { 700 // Only the VM thread handles BREAK_SIGNAL ... 701 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 702 } else { 703 // ... all other threads block BREAK_SIGNAL 704 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 705 } 706 } 707 } 708 709 // retrieve memory information. 710 // Returns false if something went wrong; 711 // content of pmi undefined in this case. 712 bool os::Aix::get_meminfo(meminfo_t* pmi) { 713 714 assert(pmi, "get_meminfo: invalid parameter"); 715 716 memset(pmi, 0, sizeof(meminfo_t)); 717 718 if (os::Aix::on_pase()) { 719 // On PASE, use the libo4 porting library. 720 721 unsigned long long virt_total = 0; 722 unsigned long long real_total = 0; 723 unsigned long long real_free = 0; 724 unsigned long long pgsp_total = 0; 725 unsigned long long pgsp_free = 0; 726 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) { 727 pmi->virt_total = virt_total; 728 pmi->real_total = real_total; 729 pmi->real_free = real_free; 730 pmi->pgsp_total = pgsp_total; 731 pmi->pgsp_free = pgsp_free; 732 return true; 733 } 734 return false; 735 736 } else { 737 738 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics 739 // See: 740 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 741 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm 742 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 743 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 744 745 perfstat_memory_total_t psmt; 746 memset (&psmt, '\0', sizeof(psmt)); 747 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); 748 if (rc == -1) { 749 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno); 750 assert(0, "perfstat_memory_total() failed"); 751 return false; 752 } 753 754 assert(rc == 1, "perfstat_memory_total() - weird return code"); 755 756 // excerpt from 757 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 758 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 759 // The fields of perfstat_memory_total_t: 760 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). 761 // u_longlong_t real_total Total real memory (in 4 KB pages). 762 // u_longlong_t real_free Free real memory (in 4 KB pages). 763 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). 764 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). 765 766 pmi->virt_total = psmt.virt_total * 4096; 767 pmi->real_total = psmt.real_total * 4096; 768 pmi->real_free = psmt.real_free * 4096; 769 pmi->pgsp_total = psmt.pgsp_total * 4096; 770 pmi->pgsp_free = psmt.pgsp_free * 4096; 771 772 return true; 773 774 } 775 } // end os::Aix::get_meminfo 776 777 ////////////////////////////////////////////////////////////////////////////// 778 // create new thread 779 780 // Thread start routine for all newly created threads 781 static void *thread_native_entry(Thread *thread) { 782 783 thread->record_stack_base_and_size(); 784 785 const pthread_t pthread_id = ::pthread_self(); 786 const tid_t kernel_thread_id = ::thread_self(); 787 788 LogTarget(Info, os, thread) lt; 789 if (lt.is_enabled()) { 790 address low_address = thread->stack_end(); 791 address high_address = thread->stack_base(); 792 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT 793 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).", 794 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address, 795 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); 796 } 797 798 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() 799 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party 800 // tools hook pthread_create(). In this case, we may run into problems establishing 801 // guard pages on those stacks, because the stacks may reside in memory which is not 802 // protectable (shmated). 803 if (thread->stack_base() > ::sbrk(0)) { 804 log_warning(os, thread)("Thread stack not in data segment."); 805 } 806 807 // Try to randomize the cache line index of hot stack frames. 808 // This helps when threads of the same stack traces evict each other's 809 // cache lines. The threads can be either from the same JVM instance, or 810 // from different JVM instances. The benefit is especially true for 811 // processors with hyperthreading technology. 812 813 static int counter = 0; 814 int pid = os::current_process_id(); 815 alloca(((pid ^ counter++) & 7) * 128); 816 817 thread->initialize_thread_current(); 818 819 OSThread* osthread = thread->osthread(); 820 821 // Thread_id is pthread id. 822 osthread->set_thread_id(pthread_id); 823 824 // .. but keep kernel thread id too for diagnostics 825 osthread->set_kernel_thread_id(kernel_thread_id); 826 827 // Initialize signal mask for this thread. 828 os::Aix::hotspot_sigmask(thread); 829 830 // Initialize floating point control register. 831 os::Aix::init_thread_fpu_state(); 832 833 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); 834 835 // Call one more level start routine. 836 thread->call_run(); 837 838 // Note: at this point the thread object may already have deleted itself. 839 // Prevent dereferencing it from here on out. 840 thread = NULL; 841 842 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 843 os::current_thread_id(), (uintx) kernel_thread_id); 844 845 return 0; 846 } 847 848 bool os::create_thread(Thread* thread, ThreadType thr_type, 849 size_t req_stack_size) { 850 851 assert(thread->osthread() == NULL, "caller responsible"); 852 853 // Allocate the OSThread object. 854 OSThread* osthread = new OSThread(NULL, NULL); 855 if (osthread == NULL) { 856 return false; 857 } 858 859 // Set the correct thread state. 860 osthread->set_thread_type(thr_type); 861 862 // Initial state is ALLOCATED but not INITIALIZED 863 osthread->set_state(ALLOCATED); 864 865 thread->set_osthread(osthread); 866 867 // Init thread attributes. 868 pthread_attr_t attr; 869 pthread_attr_init(&attr); 870 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); 871 872 // Make sure we run in 1:1 kernel-user-thread mode. 873 if (os::Aix::on_aix()) { 874 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); 875 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); 876 } 877 878 // Start in suspended state, and in os::thread_start, wake the thread up. 879 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); 880 881 // Calculate stack size if it's not specified by caller. 882 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 883 884 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) 885 // the real thread stack size may be smaller than the requested stack size, by as much as 64K. 886 // This very much looks like a pthread lib error. As a workaround, increase the stack size 887 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB) 888 if (stack_size < 4096 * K) { 889 stack_size += 64 * K; 890 } 891 892 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the 893 // thread size in attr unchanged. If this is the minimal stack size as set 894 // by pthread_attr_init this leads to crashes after thread creation. E.g. the 895 // guard pages might not fit on the tiny stack created. 896 int ret = pthread_attr_setstacksize(&attr, stack_size); 897 if (ret != 0) { 898 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k", 899 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "), 900 stack_size / K); 901 thread->set_osthread(NULL); 902 delete osthread; 903 return false; 904 } 905 906 // Save some cycles and a page by disabling OS guard pages where we have our own 907 // VM guard pages (in java threads). For other threads, keep system default guard 908 // pages in place. 909 if (thr_type == java_thread || thr_type == compiler_thread) { 910 ret = pthread_attr_setguardsize(&attr, 0); 911 } 912 913 pthread_t tid = 0; 914 if (ret == 0) { 915 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 916 } 917 918 if (ret == 0) { 919 char buf[64]; 920 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 921 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 922 } else { 923 char buf[64]; 924 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.", 925 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 926 // Log some OS information which might explain why creating the thread failed. 927 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 928 LogStream st(Log(os, thread)::info()); 929 os::Posix::print_rlimit_info(&st); 930 os::print_memory_info(&st); 931 } 932 933 pthread_attr_destroy(&attr); 934 935 if (ret != 0) { 936 // Need to clean up stuff we've allocated so far. 937 thread->set_osthread(NULL); 938 delete osthread; 939 return false; 940 } 941 942 // OSThread::thread_id is the pthread id. 943 osthread->set_thread_id(tid); 944 945 return true; 946 } 947 948 ///////////////////////////////////////////////////////////////////////////// 949 // attach existing thread 950 951 // bootstrap the main thread 952 bool os::create_main_thread(JavaThread* thread) { 953 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); 954 return create_attached_thread(thread); 955 } 956 957 bool os::create_attached_thread(JavaThread* thread) { 958 #ifdef ASSERT 959 thread->verify_not_published(); 960 #endif 961 962 // Allocate the OSThread object 963 OSThread* osthread = new OSThread(NULL, NULL); 964 965 if (osthread == NULL) { 966 return false; 967 } 968 969 const pthread_t pthread_id = ::pthread_self(); 970 const tid_t kernel_thread_id = ::thread_self(); 971 972 // OSThread::thread_id is the pthread id. 973 osthread->set_thread_id(pthread_id); 974 975 // .. but keep kernel thread id too for diagnostics 976 osthread->set_kernel_thread_id(kernel_thread_id); 977 978 // initialize floating point control register 979 os::Aix::init_thread_fpu_state(); 980 981 // Initial thread state is RUNNABLE 982 osthread->set_state(RUNNABLE); 983 984 thread->set_osthread(osthread); 985 986 if (UseNUMA) { 987 int lgrp_id = os::numa_get_group_id(); 988 if (lgrp_id != -1) { 989 thread->set_lgrp_id(lgrp_id); 990 } 991 } 992 993 // initialize signal mask for this thread 994 // and save the caller's signal mask 995 os::Aix::hotspot_sigmask(thread); 996 997 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 998 os::current_thread_id(), (uintx) kernel_thread_id); 999 1000 return true; 1001 } 1002 1003 void os::pd_start_thread(Thread* thread) { 1004 int status = pthread_continue_np(thread->osthread()->pthread_id()); 1005 assert(status == 0, "thr_continue failed"); 1006 } 1007 1008 // Free OS resources related to the OSThread 1009 void os::free_thread(OSThread* osthread) { 1010 assert(osthread != NULL, "osthread not set"); 1011 1012 // We are told to free resources of the argument thread, 1013 // but we can only really operate on the current thread. 1014 assert(Thread::current()->osthread() == osthread, 1015 "os::free_thread but not current thread"); 1016 1017 // Restore caller's signal mask 1018 sigset_t sigmask = osthread->caller_sigmask(); 1019 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1020 1021 delete osthread; 1022 } 1023 1024 //////////////////////////////////////////////////////////////////////////////// 1025 // time support 1026 1027 // Time since start-up in seconds to a fine granularity. 1028 // Used by VMSelfDestructTimer and the MemProfiler. 1029 double os::elapsedTime() { 1030 return (double)(os::elapsed_counter()) * 0.000001; 1031 } 1032 1033 jlong os::elapsed_counter() { 1034 timeval time; 1035 int status = gettimeofday(&time, NULL); 1036 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1037 } 1038 1039 jlong os::elapsed_frequency() { 1040 return (1000 * 1000); 1041 } 1042 1043 bool os::supports_vtime() { return true; } 1044 bool os::enable_vtime() { return false; } 1045 bool os::vtime_enabled() { return false; } 1046 1047 double os::elapsedVTime() { 1048 struct rusage usage; 1049 int retval = getrusage(RUSAGE_THREAD, &usage); 1050 if (retval == 0) { 1051 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1052 } else { 1053 // better than nothing, but not much 1054 return elapsedTime(); 1055 } 1056 } 1057 1058 jlong os::javaTimeMillis() { 1059 timeval time; 1060 int status = gettimeofday(&time, NULL); 1061 assert(status != -1, "aix error at gettimeofday()"); 1062 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1063 } 1064 1065 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1066 timeval time; 1067 int status = gettimeofday(&time, NULL); 1068 assert(status != -1, "aix error at gettimeofday()"); 1069 seconds = jlong(time.tv_sec); 1070 nanos = jlong(time.tv_usec) * 1000; 1071 } 1072 1073 // We use mread_real_time here. 1074 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1075 // it has to be converted to real time. AIX documentations suggests to do 1076 // this unconditionally, so we do it. 1077 // 1078 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1079 // 1080 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1081 // conversion is necessary. However, mread_real_time will not return 1082 // monotonic results but merely matches read_real_time. So we need a tweak 1083 // to ensure monotonic results. 1084 // 1085 // For PASE no public documentation exists, just word by IBM 1086 jlong os::javaTimeNanos() { 1087 timebasestruct_t time; 1088 int rc = mread_real_time(&time, TIMEBASE_SZ); 1089 if (os::Aix::on_pase()) { 1090 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1091 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1092 jlong prev = max_real_time; 1093 if (now <= prev) { 1094 return prev; // same or retrograde time; 1095 } 1096 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev); 1097 assert(obsv >= prev, "invariant"); // Monotonicity 1098 // If the CAS succeeded then we're done and return "now". 1099 // If the CAS failed and the observed value "obsv" is >= now then 1100 // we should return "obsv". If the CAS failed and now > obsv > prv then 1101 // some other thread raced this thread and installed a new value, in which case 1102 // we could either (a) retry the entire operation, (b) retry trying to install now 1103 // or (c) just return obsv. We use (c). No loop is required although in some cases 1104 // we might discard a higher "now" value in deference to a slightly lower but freshly 1105 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1106 // to (a) or (b) -- and greatly reduces coherence traffic. 1107 // We might also condition (c) on the magnitude of the delta between obsv and now. 1108 // Avoiding excessive CAS operations to hot RW locations is critical. 1109 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1110 return (prev == obsv) ? now : obsv; 1111 } else { 1112 if (rc != RTC_POWER) { 1113 rc = time_base_to_time(&time, TIMEBASE_SZ); 1114 assert(rc != -1, "error calling time_base_to_time()"); 1115 } 1116 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1117 } 1118 } 1119 1120 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1121 info_ptr->max_value = ALL_64_BITS; 1122 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1123 info_ptr->may_skip_backward = false; 1124 info_ptr->may_skip_forward = false; 1125 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1126 } 1127 1128 // Return the real, user, and system times in seconds from an 1129 // arbitrary fixed point in the past. 1130 bool os::getTimesSecs(double* process_real_time, 1131 double* process_user_time, 1132 double* process_system_time) { 1133 struct tms ticks; 1134 clock_t real_ticks = times(&ticks); 1135 1136 if (real_ticks == (clock_t) (-1)) { 1137 return false; 1138 } else { 1139 double ticks_per_second = (double) clock_tics_per_sec; 1140 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1141 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1142 *process_real_time = ((double) real_ticks) / ticks_per_second; 1143 1144 return true; 1145 } 1146 } 1147 1148 char * os::local_time_string(char *buf, size_t buflen) { 1149 struct tm t; 1150 time_t long_time; 1151 time(&long_time); 1152 localtime_r(&long_time, &t); 1153 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1154 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1155 t.tm_hour, t.tm_min, t.tm_sec); 1156 return buf; 1157 } 1158 1159 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1160 return localtime_r(clock, res); 1161 } 1162 1163 //////////////////////////////////////////////////////////////////////////////// 1164 // runtime exit support 1165 1166 // Note: os::shutdown() might be called very early during initialization, or 1167 // called from signal handler. Before adding something to os::shutdown(), make 1168 // sure it is async-safe and can handle partially initialized VM. 1169 void os::shutdown() { 1170 1171 // allow PerfMemory to attempt cleanup of any persistent resources 1172 perfMemory_exit(); 1173 1174 // needs to remove object in file system 1175 AttachListener::abort(); 1176 1177 // flush buffered output, finish log files 1178 ostream_abort(); 1179 1180 // Check for abort hook 1181 abort_hook_t abort_hook = Arguments::abort_hook(); 1182 if (abort_hook != NULL) { 1183 abort_hook(); 1184 } 1185 } 1186 1187 // Note: os::abort() might be called very early during initialization, or 1188 // called from signal handler. Before adding something to os::abort(), make 1189 // sure it is async-safe and can handle partially initialized VM. 1190 void os::abort(bool dump_core, void* siginfo, const void* context) { 1191 os::shutdown(); 1192 if (dump_core) { 1193 #ifndef PRODUCT 1194 fdStream out(defaultStream::output_fd()); 1195 out.print_raw("Current thread is "); 1196 char buf[16]; 1197 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1198 out.print_raw_cr(buf); 1199 out.print_raw_cr("Dumping core ..."); 1200 #endif 1201 ::abort(); // dump core 1202 } 1203 1204 ::exit(1); 1205 } 1206 1207 // Die immediately, no exit hook, no abort hook, no cleanup. 1208 // Dump a core file, if possible, for debugging. 1209 void os::die() { 1210 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1211 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1212 // and don't take the time to generate a core file. 1213 os::signal_raise(SIGKILL); 1214 } else { 1215 ::abort(); 1216 } 1217 } 1218 1219 intx os::current_thread_id() { 1220 return (intx)pthread_self(); 1221 } 1222 1223 int os::current_process_id() { 1224 return getpid(); 1225 } 1226 1227 // DLL functions 1228 1229 const char* os::dll_file_extension() { return ".so"; } 1230 1231 // This must be hard coded because it's the system's temporary 1232 // directory not the java application's temp directory, ala java.io.tmpdir. 1233 const char* os::get_temp_directory() { return "/tmp"; } 1234 1235 // Check if addr is inside libjvm.so. 1236 bool os::address_is_in_vm(address addr) { 1237 1238 // Input could be a real pc or a function pointer literal. The latter 1239 // would be a function descriptor residing in the data segment of a module. 1240 loaded_module_t lm; 1241 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1242 return lm.is_in_vm; 1243 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1244 return lm.is_in_vm; 1245 } else { 1246 return false; 1247 } 1248 1249 } 1250 1251 // Resolve an AIX function descriptor literal to a code pointer. 1252 // If the input is a valid code pointer to a text segment of a loaded module, 1253 // it is returned unchanged. 1254 // If the input is a valid AIX function descriptor, it is resolved to the 1255 // code entry point. 1256 // If the input is neither a valid function descriptor nor a valid code pointer, 1257 // NULL is returned. 1258 static address resolve_function_descriptor_to_code_pointer(address p) { 1259 1260 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1261 // It is a real code pointer. 1262 return p; 1263 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1264 // Pointer to data segment, potential function descriptor. 1265 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1266 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1267 // It is a function descriptor. 1268 return code_entry; 1269 } 1270 } 1271 1272 return NULL; 1273 } 1274 1275 bool os::dll_address_to_function_name(address addr, char *buf, 1276 int buflen, int *offset, 1277 bool demangle) { 1278 if (offset) { 1279 *offset = -1; 1280 } 1281 // Buf is not optional, but offset is optional. 1282 assert(buf != NULL, "sanity check"); 1283 buf[0] = '\0'; 1284 1285 // Resolve function ptr literals first. 1286 addr = resolve_function_descriptor_to_code_pointer(addr); 1287 if (!addr) { 1288 return false; 1289 } 1290 1291 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1292 } 1293 1294 bool os::dll_address_to_library_name(address addr, char* buf, 1295 int buflen, int* offset) { 1296 if (offset) { 1297 *offset = -1; 1298 } 1299 // Buf is not optional, but offset is optional. 1300 assert(buf != NULL, "sanity check"); 1301 buf[0] = '\0'; 1302 1303 // Resolve function ptr literals first. 1304 addr = resolve_function_descriptor_to_code_pointer(addr); 1305 if (!addr) { 1306 return false; 1307 } 1308 1309 return AixSymbols::get_module_name(addr, buf, buflen); 1310 } 1311 1312 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1313 // for the same architecture as Hotspot is running on. 1314 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1315 1316 log_info(os)("attempting shared library load of %s", filename); 1317 1318 if (ebuf && ebuflen > 0) { 1319 ebuf[0] = '\0'; 1320 ebuf[ebuflen - 1] = '\0'; 1321 } 1322 1323 if (!filename || strlen(filename) == 0) { 1324 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1325 return NULL; 1326 } 1327 1328 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1329 void * result= ::dlopen(filename, RTLD_LAZY); 1330 if (result != NULL) { 1331 Events::log(NULL, "Loaded shared library %s", filename); 1332 // Reload dll cache. Don't do this in signal handling. 1333 LoadedLibraries::reload(); 1334 log_info(os)("shared library load of %s was successful", filename); 1335 return result; 1336 } else { 1337 // error analysis when dlopen fails 1338 const char* error_report = ::dlerror(); 1339 if (error_report == NULL) { 1340 error_report = "dlerror returned no error description"; 1341 } 1342 if (ebuf != NULL && ebuflen > 0) { 1343 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1344 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1345 } 1346 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1347 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1348 } 1349 return NULL; 1350 } 1351 1352 void* os::dll_lookup(void* handle, const char* name) { 1353 void* res = dlsym(handle, name); 1354 return res; 1355 } 1356 1357 void* os::get_default_process_handle() { 1358 return (void*)::dlopen(NULL, RTLD_LAZY); 1359 } 1360 1361 void os::print_dll_info(outputStream *st) { 1362 st->print_cr("Dynamic libraries:"); 1363 LoadedLibraries::print(st); 1364 } 1365 1366 void os::get_summary_os_info(char* buf, size_t buflen) { 1367 // There might be something more readable than uname results for AIX. 1368 struct utsname name; 1369 uname(&name); 1370 snprintf(buf, buflen, "%s %s", name.release, name.version); 1371 } 1372 1373 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1374 // Not yet implemented. 1375 return 0; 1376 } 1377 1378 void os::print_os_info_brief(outputStream* st) { 1379 uint32_t ver = os::Aix::os_version(); 1380 st->print_cr("AIX kernel version %u.%u.%u.%u", 1381 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1382 1383 os::Posix::print_uname_info(st); 1384 1385 // Linux uses print_libversion_info(st); here. 1386 } 1387 1388 void os::print_os_info(outputStream* st) { 1389 st->print("OS:"); 1390 1391 st->print("uname:"); 1392 struct utsname name; 1393 uname(&name); 1394 st->print(name.sysname); st->print(" "); 1395 st->print(name.nodename); st->print(" "); 1396 st->print(name.release); st->print(" "); 1397 st->print(name.version); st->print(" "); 1398 st->print(name.machine); 1399 st->cr(); 1400 1401 uint32_t ver = os::Aix::os_version(); 1402 st->print_cr("AIX kernel version %u.%u.%u.%u", 1403 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1404 1405 os::Posix::print_rlimit_info(st); 1406 1407 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process. 1408 long tmax = sysconf(_SC_THREAD_THREADS_MAX); 1409 st->print_cr("maximum #threads within a process:%ld", tmax); 1410 1411 // load average 1412 st->print("load average:"); 1413 double loadavg[3] = {-1.L, -1.L, -1.L}; 1414 os::loadavg(loadavg, 3); 1415 st->print_cr("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 1416 1417 // print wpar info 1418 libperfstat::wparinfo_t wi; 1419 if (libperfstat::get_wparinfo(&wi)) { 1420 st->print_cr("wpar info"); 1421 st->print_cr("name: %s", wi.name); 1422 st->print_cr("id: %d", wi.wpar_id); 1423 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1424 } 1425 1426 VM_Version::print_platform_virtualization_info(st); 1427 } 1428 1429 void os::print_memory_info(outputStream* st) { 1430 1431 st->print_cr("Memory:"); 1432 1433 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1434 describe_pagesize(g_multipage_support.pagesize)); 1435 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1436 describe_pagesize(g_multipage_support.datapsize)); 1437 st->print_cr(" Text page size: %s", 1438 describe_pagesize(g_multipage_support.textpsize)); 1439 st->print_cr(" Thread stack page size (pthread): %s", 1440 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1441 st->print_cr(" Default shared memory page size: %s", 1442 describe_pagesize(g_multipage_support.shmpsize)); 1443 st->print_cr(" Can use 64K pages dynamically with shared memory: %s", 1444 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1445 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1446 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1447 st->print_cr(" Multipage error: %d", 1448 g_multipage_support.error); 1449 st->cr(); 1450 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1451 1452 // print out LDR_CNTRL because it affects the default page sizes 1453 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1454 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1455 1456 // Print out EXTSHM because it is an unsupported setting. 1457 const char* const extshm = ::getenv("EXTSHM"); 1458 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1459 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1460 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1461 } 1462 1463 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1464 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1465 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1466 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1467 st->cr(); 1468 1469 os::Aix::meminfo_t mi; 1470 if (os::Aix::get_meminfo(&mi)) { 1471 if (os::Aix::on_aix()) { 1472 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1473 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1474 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1475 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1476 } else { 1477 // PASE - Numbers are result of QWCRSSTS; they mean: 1478 // real_total: Sum of all system pools 1479 // real_free: always 0 1480 // pgsp_total: we take the size of the system ASP 1481 // pgsp_free: size of system ASP times percentage of system ASP unused 1482 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1483 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1484 st->print_cr("%% system asp used : %.2f", 1485 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1486 } 1487 } 1488 st->cr(); 1489 1490 // Print program break. 1491 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1492 address brk_now = (address)::sbrk(0); 1493 if (brk_now != (address)-1) { 1494 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1495 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1496 } 1497 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1498 st->cr(); 1499 1500 // Print segments allocated with os::reserve_memory. 1501 st->print_cr("internal virtual memory regions used by vm:"); 1502 vmembk_print_on(st); 1503 } 1504 1505 // Get a string for the cpuinfo that is a summary of the cpu type 1506 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1507 // read _system_configuration.version 1508 switch (_system_configuration.version) { 1509 case PV_8: 1510 strncpy(buf, "Power PC 8", buflen); 1511 break; 1512 case PV_7: 1513 strncpy(buf, "Power PC 7", buflen); 1514 break; 1515 case PV_6_1: 1516 strncpy(buf, "Power PC 6 DD1.x", buflen); 1517 break; 1518 case PV_6: 1519 strncpy(buf, "Power PC 6", buflen); 1520 break; 1521 case PV_5: 1522 strncpy(buf, "Power PC 5", buflen); 1523 break; 1524 case PV_5_2: 1525 strncpy(buf, "Power PC 5_2", buflen); 1526 break; 1527 case PV_5_3: 1528 strncpy(buf, "Power PC 5_3", buflen); 1529 break; 1530 case PV_5_Compat: 1531 strncpy(buf, "PV_5_Compat", buflen); 1532 break; 1533 case PV_6_Compat: 1534 strncpy(buf, "PV_6_Compat", buflen); 1535 break; 1536 case PV_7_Compat: 1537 strncpy(buf, "PV_7_Compat", buflen); 1538 break; 1539 case PV_8_Compat: 1540 strncpy(buf, "PV_8_Compat", buflen); 1541 break; 1542 default: 1543 strncpy(buf, "unknown", buflen); 1544 } 1545 } 1546 1547 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1548 // Nothing to do beyond of what os::print_cpu_info() does. 1549 } 1550 1551 static void print_signal_handler(outputStream* st, int sig, 1552 char* buf, size_t buflen); 1553 1554 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1555 st->print_cr("Signal Handlers:"); 1556 print_signal_handler(st, SIGSEGV, buf, buflen); 1557 print_signal_handler(st, SIGBUS , buf, buflen); 1558 print_signal_handler(st, SIGFPE , buf, buflen); 1559 print_signal_handler(st, SIGPIPE, buf, buflen); 1560 print_signal_handler(st, SIGXFSZ, buf, buflen); 1561 print_signal_handler(st, SIGILL , buf, buflen); 1562 print_signal_handler(st, SR_signum, buf, buflen); 1563 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1564 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1565 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1566 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1567 print_signal_handler(st, SIGTRAP, buf, buflen); 1568 // We also want to know if someone else adds a SIGDANGER handler because 1569 // that will interfere with OOM killling. 1570 print_signal_handler(st, SIGDANGER, buf, buflen); 1571 } 1572 1573 static char saved_jvm_path[MAXPATHLEN] = {0}; 1574 1575 // Find the full path to the current module, libjvm.so. 1576 void os::jvm_path(char *buf, jint buflen) { 1577 // Error checking. 1578 if (buflen < MAXPATHLEN) { 1579 assert(false, "must use a large-enough buffer"); 1580 buf[0] = '\0'; 1581 return; 1582 } 1583 // Lazy resolve the path to current module. 1584 if (saved_jvm_path[0] != 0) { 1585 strcpy(buf, saved_jvm_path); 1586 return; 1587 } 1588 1589 Dl_info dlinfo; 1590 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1591 assert(ret != 0, "cannot locate libjvm"); 1592 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1593 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1594 1595 if (Arguments::sun_java_launcher_is_altjvm()) { 1596 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1597 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1598 // If "/jre/lib/" appears at the right place in the string, then 1599 // assume we are installed in a JDK and we're done. Otherwise, check 1600 // for a JAVA_HOME environment variable and fix up the path so it 1601 // looks like libjvm.so is installed there (append a fake suffix 1602 // hotspot/libjvm.so). 1603 const char *p = buf + strlen(buf) - 1; 1604 for (int count = 0; p > buf && count < 4; ++count) { 1605 for (--p; p > buf && *p != '/'; --p) 1606 /* empty */ ; 1607 } 1608 1609 if (strncmp(p, "/jre/lib/", 9) != 0) { 1610 // Look for JAVA_HOME in the environment. 1611 char* java_home_var = ::getenv("JAVA_HOME"); 1612 if (java_home_var != NULL && java_home_var[0] != 0) { 1613 char* jrelib_p; 1614 int len; 1615 1616 // Check the current module name "libjvm.so". 1617 p = strrchr(buf, '/'); 1618 if (p == NULL) { 1619 return; 1620 } 1621 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1622 1623 rp = os::Posix::realpath(java_home_var, buf, buflen); 1624 if (rp == NULL) { 1625 return; 1626 } 1627 1628 // determine if this is a legacy image or modules image 1629 // modules image doesn't have "jre" subdirectory 1630 len = strlen(buf); 1631 assert(len < buflen, "Ran out of buffer room"); 1632 jrelib_p = buf + len; 1633 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1634 if (0 != access(buf, F_OK)) { 1635 snprintf(jrelib_p, buflen-len, "/lib"); 1636 } 1637 1638 if (0 == access(buf, F_OK)) { 1639 // Use current module name "libjvm.so" 1640 len = strlen(buf); 1641 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1642 } else { 1643 // Go back to path of .so 1644 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1645 if (rp == NULL) { 1646 return; 1647 } 1648 } 1649 } 1650 } 1651 } 1652 1653 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1654 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1655 } 1656 1657 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1658 // no prefix required, not even "_" 1659 } 1660 1661 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1662 // no suffix required 1663 } 1664 1665 //////////////////////////////////////////////////////////////////////////////// 1666 // sun.misc.Signal support 1667 1668 static void 1669 UserHandler(int sig, void *siginfo, void *context) { 1670 // Ctrl-C is pressed during error reporting, likely because the error 1671 // handler fails to abort. Let VM die immediately. 1672 if (sig == SIGINT && VMError::is_error_reported()) { 1673 os::die(); 1674 } 1675 1676 os::signal_notify(sig); 1677 } 1678 1679 void* os::user_handler() { 1680 return CAST_FROM_FN_PTR(void*, UserHandler); 1681 } 1682 1683 extern "C" { 1684 typedef void (*sa_handler_t)(int); 1685 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1686 } 1687 1688 void* os::signal(int signal_number, void* handler) { 1689 struct sigaction sigAct, oldSigAct; 1690 1691 sigfillset(&(sigAct.sa_mask)); 1692 1693 // Do not block out synchronous signals in the signal handler. 1694 // Blocking synchronous signals only makes sense if you can really 1695 // be sure that those signals won't happen during signal handling, 1696 // when the blocking applies. Normal signal handlers are lean and 1697 // do not cause signals. But our signal handlers tend to be "risky" 1698 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1699 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1700 // by a SIGILL, which was blocked due to the signal mask. The process 1701 // just hung forever. Better to crash from a secondary signal than to hang. 1702 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1703 sigdelset(&(sigAct.sa_mask), SIGBUS); 1704 sigdelset(&(sigAct.sa_mask), SIGILL); 1705 sigdelset(&(sigAct.sa_mask), SIGFPE); 1706 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1707 1708 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1709 1710 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1711 1712 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1713 // -1 means registration failed 1714 return (void *)-1; 1715 } 1716 1717 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1718 } 1719 1720 void os::signal_raise(int signal_number) { 1721 ::raise(signal_number); 1722 } 1723 1724 // 1725 // The following code is moved from os.cpp for making this 1726 // code platform specific, which it is by its very nature. 1727 // 1728 1729 // Will be modified when max signal is changed to be dynamic 1730 int os::sigexitnum_pd() { 1731 return NSIG; 1732 } 1733 1734 // a counter for each possible signal value 1735 static volatile jint pending_signals[NSIG+1] = { 0 }; 1736 1737 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1738 // On AIX, we use sem_init(), sem_post(), sem_wait() 1739 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1740 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1741 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1742 // on AIX, msem_..() calls are suspected of causing problems. 1743 static sem_t sig_sem; 1744 static msemaphore* p_sig_msem = 0; 1745 1746 static void local_sem_init() { 1747 if (os::Aix::on_aix()) { 1748 int rc = ::sem_init(&sig_sem, 0, 0); 1749 guarantee(rc != -1, "sem_init failed"); 1750 } else { 1751 // Memory semaphores must live in shared mem. 1752 guarantee0(p_sig_msem == NULL); 1753 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1754 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1755 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1756 } 1757 } 1758 1759 static void local_sem_post() { 1760 static bool warn_only_once = false; 1761 if (os::Aix::on_aix()) { 1762 int rc = ::sem_post(&sig_sem); 1763 if (rc == -1 && !warn_only_once) { 1764 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1765 warn_only_once = true; 1766 } 1767 } else { 1768 guarantee0(p_sig_msem != NULL); 1769 int rc = ::msem_unlock(p_sig_msem, 0); 1770 if (rc == -1 && !warn_only_once) { 1771 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1772 warn_only_once = true; 1773 } 1774 } 1775 } 1776 1777 static void local_sem_wait() { 1778 static bool warn_only_once = false; 1779 if (os::Aix::on_aix()) { 1780 int rc = ::sem_wait(&sig_sem); 1781 if (rc == -1 && !warn_only_once) { 1782 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1783 warn_only_once = true; 1784 } 1785 } else { 1786 guarantee0(p_sig_msem != NULL); // must init before use 1787 int rc = ::msem_lock(p_sig_msem, 0); 1788 if (rc == -1 && !warn_only_once) { 1789 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1790 warn_only_once = true; 1791 } 1792 } 1793 } 1794 1795 static void jdk_misc_signal_init() { 1796 // Initialize signal structures 1797 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1798 1799 // Initialize signal semaphore 1800 local_sem_init(); 1801 } 1802 1803 void os::signal_notify(int sig) { 1804 Atomic::inc(&pending_signals[sig]); 1805 local_sem_post(); 1806 } 1807 1808 static int check_pending_signals() { 1809 for (;;) { 1810 for (int i = 0; i < NSIG + 1; i++) { 1811 jint n = pending_signals[i]; 1812 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1813 return i; 1814 } 1815 } 1816 JavaThread *thread = JavaThread::current(); 1817 ThreadBlockInVM tbivm(thread); 1818 1819 bool threadIsSuspended; 1820 do { 1821 thread->set_suspend_equivalent(); 1822 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1823 1824 local_sem_wait(); 1825 1826 // were we externally suspended while we were waiting? 1827 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1828 if (threadIsSuspended) { 1829 // 1830 // The semaphore has been incremented, but while we were waiting 1831 // another thread suspended us. We don't want to continue running 1832 // while suspended because that would surprise the thread that 1833 // suspended us. 1834 // 1835 1836 local_sem_post(); 1837 1838 thread->java_suspend_self(); 1839 } 1840 } while (threadIsSuspended); 1841 } 1842 } 1843 1844 int os::signal_wait() { 1845 return check_pending_signals(); 1846 } 1847 1848 //////////////////////////////////////////////////////////////////////////////// 1849 // Virtual Memory 1850 1851 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1852 1853 #define VMEM_MAPPED 1 1854 #define VMEM_SHMATED 2 1855 1856 struct vmembk_t { 1857 int type; // 1 - mmap, 2 - shmat 1858 char* addr; 1859 size_t size; // Real size, may be larger than usersize. 1860 size_t pagesize; // page size of area 1861 vmembk_t* next; 1862 1863 bool contains_addr(char* p) const { 1864 return p >= addr && p < (addr + size); 1865 } 1866 1867 bool contains_range(char* p, size_t s) const { 1868 return contains_addr(p) && contains_addr(p + s - 1); 1869 } 1870 1871 void print_on(outputStream* os) const { 1872 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1873 " bytes, %d %s pages), %s", 1874 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1875 (type == VMEM_SHMATED ? "shmat" : "mmap") 1876 ); 1877 } 1878 1879 // Check that range is a sub range of memory block (or equal to memory block); 1880 // also check that range is fully page aligned to the page size if the block. 1881 void assert_is_valid_subrange(char* p, size_t s) const { 1882 if (!contains_range(p, s)) { 1883 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1884 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1885 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size)); 1886 guarantee0(false); 1887 } 1888 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1889 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1890 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize); 1891 guarantee0(false); 1892 } 1893 } 1894 }; 1895 1896 static struct { 1897 vmembk_t* first; 1898 MiscUtils::CritSect cs; 1899 } vmem; 1900 1901 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1902 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1903 assert0(p); 1904 if (p) { 1905 MiscUtils::AutoCritSect lck(&vmem.cs); 1906 p->addr = addr; p->size = size; 1907 p->pagesize = pagesize; 1908 p->type = type; 1909 p->next = vmem.first; 1910 vmem.first = p; 1911 } 1912 } 1913 1914 static vmembk_t* vmembk_find(char* addr) { 1915 MiscUtils::AutoCritSect lck(&vmem.cs); 1916 for (vmembk_t* p = vmem.first; p; p = p->next) { 1917 if (p->addr <= addr && (p->addr + p->size) > addr) { 1918 return p; 1919 } 1920 } 1921 return NULL; 1922 } 1923 1924 static void vmembk_remove(vmembk_t* p0) { 1925 MiscUtils::AutoCritSect lck(&vmem.cs); 1926 assert0(p0); 1927 assert0(vmem.first); // List should not be empty. 1928 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1929 if (*pp == p0) { 1930 *pp = p0->next; 1931 ::free(p0); 1932 return; 1933 } 1934 } 1935 assert0(false); // Not found? 1936 } 1937 1938 static void vmembk_print_on(outputStream* os) { 1939 MiscUtils::AutoCritSect lck(&vmem.cs); 1940 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1941 vmi->print_on(os); 1942 os->cr(); 1943 } 1944 } 1945 1946 // Reserve and attach a section of System V memory. 1947 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1948 // address. Failing that, it will attach the memory anywhere. 1949 // If <requested_addr> is NULL, function will attach the memory anywhere. 1950 // 1951 // <alignment_hint> is being ignored by this function. It is very probable however that the 1952 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1953 // Should this be not enogh, we can put more work into it. 1954 static char* reserve_shmated_memory ( 1955 size_t bytes, 1956 char* requested_addr, 1957 size_t alignment_hint) { 1958 1959 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1960 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1961 bytes, p2i(requested_addr), alignment_hint); 1962 1963 // Either give me wish address or wish alignment but not both. 1964 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1965 1966 // We must prevent anyone from attaching too close to the 1967 // BRK because that may cause malloc OOM. 1968 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1969 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1970 "Will attach anywhere.", p2i(requested_addr)); 1971 // Act like the OS refused to attach there. 1972 requested_addr = NULL; 1973 } 1974 1975 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1976 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1977 if (os::Aix::on_pase_V5R4_or_older()) { 1978 ShouldNotReachHere(); 1979 } 1980 1981 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 1982 const size_t size = align_up(bytes, 64*K); 1983 1984 // Reserve the shared segment. 1985 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 1986 if (shmid == -1) { 1987 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 1988 return NULL; 1989 } 1990 1991 // Important note: 1992 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 1993 // We must right after attaching it remove it from the system. System V shm segments are global and 1994 // survive the process. 1995 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 1996 1997 struct shmid_ds shmbuf; 1998 memset(&shmbuf, 0, sizeof(shmbuf)); 1999 shmbuf.shm_pagesize = 64*K; 2000 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 2001 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 2002 size / (64*K), errno); 2003 // I want to know if this ever happens. 2004 assert(false, "failed to set page size for shmat"); 2005 } 2006 2007 // Now attach the shared segment. 2008 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 2009 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 2010 // were not a segment boundary. 2011 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 2012 const int errno_shmat = errno; 2013 2014 // (A) Right after shmat and before handing shmat errors delete the shm segment. 2015 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 2016 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 2017 assert(false, "failed to remove shared memory segment!"); 2018 } 2019 2020 // Handle shmat error. If we failed to attach, just return. 2021 if (addr == (char*)-1) { 2022 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat); 2023 return NULL; 2024 } 2025 2026 // Just for info: query the real page size. In case setting the page size did not 2027 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2028 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2029 if (real_pagesize != shmbuf.shm_pagesize) { 2030 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize); 2031 } 2032 2033 if (addr) { 2034 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2035 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize)); 2036 } else { 2037 if (requested_addr != NULL) { 2038 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr)); 2039 } else { 2040 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2041 } 2042 } 2043 2044 // book-keeping 2045 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2046 assert0(is_aligned_to(addr, os::vm_page_size())); 2047 2048 return addr; 2049 } 2050 2051 static bool release_shmated_memory(char* addr, size_t size) { 2052 2053 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2054 p2i(addr), p2i(addr + size - 1)); 2055 2056 bool rc = false; 2057 2058 // TODO: is there a way to verify shm size without doing bookkeeping? 2059 if (::shmdt(addr) != 0) { 2060 trcVerbose("error (%d).", errno); 2061 } else { 2062 trcVerbose("ok."); 2063 rc = true; 2064 } 2065 return rc; 2066 } 2067 2068 static bool uncommit_shmated_memory(char* addr, size_t size) { 2069 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2070 p2i(addr), p2i(addr + size - 1)); 2071 2072 const bool rc = my_disclaim64(addr, size); 2073 2074 if (!rc) { 2075 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size); 2076 return false; 2077 } 2078 return true; 2079 } 2080 2081 //////////////////////////////// mmap-based routines ///////////////////////////////// 2082 2083 // Reserve memory via mmap. 2084 // If <requested_addr> is given, an attempt is made to attach at the given address. 2085 // Failing that, memory is allocated at any address. 2086 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2087 // allocate at an address aligned with the given alignment. Failing that, memory 2088 // is aligned anywhere. 2089 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2090 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2091 "alignment_hint " UINTX_FORMAT "...", 2092 bytes, p2i(requested_addr), alignment_hint); 2093 2094 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2095 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2096 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr)); 2097 return NULL; 2098 } 2099 2100 // We must prevent anyone from attaching too close to the 2101 // BRK because that may cause malloc OOM. 2102 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2103 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2104 "Will attach anywhere.", p2i(requested_addr)); 2105 // Act like the OS refused to attach there. 2106 requested_addr = NULL; 2107 } 2108 2109 // Specify one or the other but not both. 2110 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2111 2112 // In 64K mode, we claim the global page size (os::vm_page_size()) 2113 // is 64K. This is one of the few points where that illusion may 2114 // break, because mmap() will always return memory aligned to 4K. So 2115 // we must ensure we only ever return memory aligned to 64k. 2116 if (alignment_hint) { 2117 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2118 } else { 2119 alignment_hint = os::vm_page_size(); 2120 } 2121 2122 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2123 const size_t size = align_up(bytes, os::vm_page_size()); 2124 2125 // alignment: Allocate memory large enough to include an aligned range of the right size and 2126 // cut off the leading and trailing waste pages. 2127 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2128 const size_t extra_size = size + alignment_hint; 2129 2130 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2131 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2132 int flags = MAP_ANONYMOUS | MAP_SHARED; 2133 2134 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2135 // it means if wishaddress is given but MAP_FIXED is not set. 2136 // 2137 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2138 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2139 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2140 // get clobbered. 2141 if (requested_addr != NULL) { 2142 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2143 flags |= MAP_FIXED; 2144 } 2145 } 2146 2147 char* addr = (char*)::mmap(requested_addr, extra_size, 2148 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2149 2150 if (addr == MAP_FAILED) { 2151 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno); 2152 return NULL; 2153 } 2154 2155 // Handle alignment. 2156 char* const addr_aligned = align_up(addr, alignment_hint); 2157 const size_t waste_pre = addr_aligned - addr; 2158 char* const addr_aligned_end = addr_aligned + size; 2159 const size_t waste_post = extra_size - waste_pre - size; 2160 if (waste_pre > 0) { 2161 ::munmap(addr, waste_pre); 2162 } 2163 if (waste_post > 0) { 2164 ::munmap(addr_aligned_end, waste_post); 2165 } 2166 addr = addr_aligned; 2167 2168 if (addr) { 2169 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2170 p2i(addr), p2i(addr + bytes), bytes); 2171 } else { 2172 if (requested_addr != NULL) { 2173 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr)); 2174 } else { 2175 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2176 } 2177 } 2178 2179 // bookkeeping 2180 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2181 2182 // Test alignment, see above. 2183 assert0(is_aligned_to(addr, os::vm_page_size())); 2184 2185 return addr; 2186 } 2187 2188 static bool release_mmaped_memory(char* addr, size_t size) { 2189 assert0(is_aligned_to(addr, os::vm_page_size())); 2190 assert0(is_aligned_to(size, os::vm_page_size())); 2191 2192 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2193 p2i(addr), p2i(addr + size - 1)); 2194 bool rc = false; 2195 2196 if (::munmap(addr, size) != 0) { 2197 trcVerbose("failed (%d)\n", errno); 2198 rc = false; 2199 } else { 2200 trcVerbose("ok."); 2201 rc = true; 2202 } 2203 2204 return rc; 2205 } 2206 2207 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2208 2209 assert0(is_aligned_to(addr, os::vm_page_size())); 2210 assert0(is_aligned_to(size, os::vm_page_size())); 2211 2212 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2213 p2i(addr), p2i(addr + size - 1)); 2214 bool rc = false; 2215 2216 // Uncommit mmap memory with msync MS_INVALIDATE. 2217 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2218 trcVerbose("failed (%d)\n", errno); 2219 rc = false; 2220 } else { 2221 trcVerbose("ok."); 2222 rc = true; 2223 } 2224 2225 return rc; 2226 } 2227 2228 int os::vm_page_size() { 2229 // Seems redundant as all get out. 2230 assert(os::Aix::page_size() != -1, "must call os::init"); 2231 return os::Aix::page_size(); 2232 } 2233 2234 // Aix allocates memory by pages. 2235 int os::vm_allocation_granularity() { 2236 assert(os::Aix::page_size() != -1, "must call os::init"); 2237 return os::Aix::page_size(); 2238 } 2239 2240 #ifdef PRODUCT 2241 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2242 int err) { 2243 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2244 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec, 2245 os::errno_name(err), err); 2246 } 2247 #endif 2248 2249 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2250 const char* mesg) { 2251 assert(mesg != NULL, "mesg must be specified"); 2252 if (!pd_commit_memory(addr, size, exec)) { 2253 // Add extra info in product mode for vm_exit_out_of_memory(): 2254 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2255 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2256 } 2257 } 2258 2259 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2260 2261 assert(is_aligned_to(addr, os::vm_page_size()), 2262 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2263 p2i(addr), os::vm_page_size()); 2264 assert(is_aligned_to(size, os::vm_page_size()), 2265 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2266 size, os::vm_page_size()); 2267 2268 vmembk_t* const vmi = vmembk_find(addr); 2269 guarantee0(vmi); 2270 vmi->assert_is_valid_subrange(addr, size); 2271 2272 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1)); 2273 2274 if (UseExplicitCommit) { 2275 // AIX commits memory on touch. So, touch all pages to be committed. 2276 for (char* p = addr; p < (addr + size); p += 4*K) { 2277 *p = '\0'; 2278 } 2279 } 2280 2281 return true; 2282 } 2283 2284 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2285 return pd_commit_memory(addr, size, exec); 2286 } 2287 2288 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2289 size_t alignment_hint, bool exec, 2290 const char* mesg) { 2291 // Alignment_hint is ignored on this OS. 2292 pd_commit_memory_or_exit(addr, size, exec, mesg); 2293 } 2294 2295 bool os::pd_uncommit_memory(char* addr, size_t size) { 2296 assert(is_aligned_to(addr, os::vm_page_size()), 2297 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2298 p2i(addr), os::vm_page_size()); 2299 assert(is_aligned_to(size, os::vm_page_size()), 2300 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2301 size, os::vm_page_size()); 2302 2303 // Dynamically do different things for mmap/shmat. 2304 const vmembk_t* const vmi = vmembk_find(addr); 2305 guarantee0(vmi); 2306 vmi->assert_is_valid_subrange(addr, size); 2307 2308 if (vmi->type == VMEM_SHMATED) { 2309 return uncommit_shmated_memory(addr, size); 2310 } else { 2311 return uncommit_mmaped_memory(addr, size); 2312 } 2313 } 2314 2315 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2316 // Do not call this; no need to commit stack pages on AIX. 2317 ShouldNotReachHere(); 2318 return true; 2319 } 2320 2321 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2322 // Do not call this; no need to commit stack pages on AIX. 2323 ShouldNotReachHere(); 2324 return true; 2325 } 2326 2327 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2328 } 2329 2330 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2331 } 2332 2333 void os::numa_make_global(char *addr, size_t bytes) { 2334 } 2335 2336 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2337 } 2338 2339 bool os::numa_topology_changed() { 2340 return false; 2341 } 2342 2343 size_t os::numa_get_groups_num() { 2344 return 1; 2345 } 2346 2347 int os::numa_get_group_id() { 2348 return 0; 2349 } 2350 2351 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2352 if (size > 0) { 2353 ids[0] = 0; 2354 return 1; 2355 } 2356 return 0; 2357 } 2358 2359 bool os::get_page_info(char *start, page_info* info) { 2360 return false; 2361 } 2362 2363 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2364 return end; 2365 } 2366 2367 // Reserves and attaches a shared memory segment. 2368 // Will assert if a wish address is given and could not be obtained. 2369 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2370 2371 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2372 // thereby clobbering old mappings at that place. That is probably 2373 // not intended, never used and almost certainly an error were it 2374 // ever be used this way (to try attaching at a specified address 2375 // without clobbering old mappings an alternate API exists, 2376 // os::attempt_reserve_memory_at()). 2377 // Instead of mimicking the dangerous coding of the other platforms, here I 2378 // just ignore the request address (release) or assert(debug). 2379 assert0(requested_addr == NULL); 2380 2381 // Always round to os::vm_page_size(), which may be larger than 4K. 2382 bytes = align_up(bytes, os::vm_page_size()); 2383 const size_t alignment_hint0 = 2384 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2385 2386 // In 4K mode always use mmap. 2387 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2388 if (os::vm_page_size() == 4*K) { 2389 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2390 } else { 2391 if (bytes >= Use64KPagesThreshold) { 2392 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2393 } else { 2394 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2395 } 2396 } 2397 } 2398 2399 bool os::pd_release_memory(char* addr, size_t size) { 2400 2401 // Dynamically do different things for mmap/shmat. 2402 vmembk_t* const vmi = vmembk_find(addr); 2403 guarantee0(vmi); 2404 2405 // Always round to os::vm_page_size(), which may be larger than 4K. 2406 size = align_up(size, os::vm_page_size()); 2407 addr = align_up(addr, os::vm_page_size()); 2408 2409 bool rc = false; 2410 bool remove_bookkeeping = false; 2411 if (vmi->type == VMEM_SHMATED) { 2412 // For shmatted memory, we do: 2413 // - If user wants to release the whole range, release the memory (shmdt). 2414 // - If user only wants to release a partial range, uncommit (disclaim) that 2415 // range. That way, at least, we do not use memory anymore (bust still page 2416 // table space). 2417 vmi->assert_is_valid_subrange(addr, size); 2418 if (addr == vmi->addr && size == vmi->size) { 2419 rc = release_shmated_memory(addr, size); 2420 remove_bookkeeping = true; 2421 } else { 2422 rc = uncommit_shmated_memory(addr, size); 2423 } 2424 } else { 2425 // User may unmap partial regions but region has to be fully contained. 2426 #ifdef ASSERT 2427 vmi->assert_is_valid_subrange(addr, size); 2428 #endif 2429 rc = release_mmaped_memory(addr, size); 2430 remove_bookkeeping = true; 2431 } 2432 2433 // update bookkeeping 2434 if (rc && remove_bookkeeping) { 2435 vmembk_remove(vmi); 2436 } 2437 2438 return rc; 2439 } 2440 2441 static bool checked_mprotect(char* addr, size_t size, int prot) { 2442 2443 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2444 // not tell me if protection failed when trying to protect an un-protectable range. 2445 // 2446 // This means if the memory was allocated using shmget/shmat, protection wont work 2447 // but mprotect will still return 0: 2448 // 2449 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2450 2451 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2452 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2453 2454 if (!rc) { 2455 const char* const s_errno = os::errno_name(errno); 2456 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2457 return false; 2458 } 2459 2460 // mprotect success check 2461 // 2462 // Mprotect said it changed the protection but can I believe it? 2463 // 2464 // To be sure I need to check the protection afterwards. Try to 2465 // read from protected memory and check whether that causes a segfault. 2466 // 2467 if (!os::Aix::xpg_sus_mode()) { 2468 2469 if (CanUseSafeFetch32()) { 2470 2471 const bool read_protected = 2472 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2473 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2474 2475 if (prot & PROT_READ) { 2476 rc = !read_protected; 2477 } else { 2478 rc = read_protected; 2479 } 2480 2481 if (!rc) { 2482 if (os::Aix::on_pase()) { 2483 // There is an issue on older PASE systems where mprotect() will return success but the 2484 // memory will not be protected. 2485 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2486 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2487 // a stack. It is an OS error. 2488 // 2489 // A valid strategy is just to try again. This usually works. :-/ 2490 2491 ::usleep(1000); 2492 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot); 2493 if (::mprotect(addr, size, prot) == 0) { 2494 const bool read_protected_2 = 2495 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2496 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2497 rc = true; 2498 } 2499 } 2500 } 2501 } 2502 } 2503 2504 assert(rc == true, "mprotect failed."); 2505 2506 return rc; 2507 } 2508 2509 // Set protections specified 2510 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2511 unsigned int p = 0; 2512 switch (prot) { 2513 case MEM_PROT_NONE: p = PROT_NONE; break; 2514 case MEM_PROT_READ: p = PROT_READ; break; 2515 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2516 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2517 default: 2518 ShouldNotReachHere(); 2519 } 2520 // is_committed is unused. 2521 return checked_mprotect(addr, size, p); 2522 } 2523 2524 bool os::guard_memory(char* addr, size_t size) { 2525 return checked_mprotect(addr, size, PROT_NONE); 2526 } 2527 2528 bool os::unguard_memory(char* addr, size_t size) { 2529 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2530 } 2531 2532 // Large page support 2533 2534 static size_t _large_page_size = 0; 2535 2536 // Enable large page support if OS allows that. 2537 void os::large_page_init() { 2538 return; // Nothing to do. See query_multipage_support and friends. 2539 } 2540 2541 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2542 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement 2543 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()), 2544 // so this is not needed. 2545 assert(false, "should not be called on AIX"); 2546 return NULL; 2547 } 2548 2549 bool os::release_memory_special(char* base, size_t bytes) { 2550 // Detaching the SHM segment will also delete it, see reserve_memory_special(). 2551 Unimplemented(); 2552 return false; 2553 } 2554 2555 size_t os::large_page_size() { 2556 return _large_page_size; 2557 } 2558 2559 bool os::can_commit_large_page_memory() { 2560 // Does not matter, we do not support huge pages. 2561 return false; 2562 } 2563 2564 bool os::can_execute_large_page_memory() { 2565 // Does not matter, we do not support huge pages. 2566 return false; 2567 } 2568 2569 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2570 assert(file_desc >= 0, "file_desc is not valid"); 2571 char* result = NULL; 2572 2573 // Always round to os::vm_page_size(), which may be larger than 4K. 2574 bytes = align_up(bytes, os::vm_page_size()); 2575 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2576 2577 if (result != NULL) { 2578 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2579 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2580 } 2581 } 2582 return result; 2583 } 2584 2585 // Reserve memory at an arbitrary address, only if that area is 2586 // available (and not reserved for something else). 2587 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2588 char* addr = NULL; 2589 2590 // Always round to os::vm_page_size(), which may be larger than 4K. 2591 bytes = align_up(bytes, os::vm_page_size()); 2592 2593 // In 4K mode always use mmap. 2594 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2595 if (os::vm_page_size() == 4*K) { 2596 return reserve_mmaped_memory(bytes, requested_addr, 0); 2597 } else { 2598 if (bytes >= Use64KPagesThreshold) { 2599 return reserve_shmated_memory(bytes, requested_addr, 0); 2600 } else { 2601 return reserve_mmaped_memory(bytes, requested_addr, 0); 2602 } 2603 } 2604 2605 return addr; 2606 } 2607 2608 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2609 void os::infinite_sleep() { 2610 while (true) { // sleep forever ... 2611 ::sleep(100); // ... 100 seconds at a time 2612 } 2613 } 2614 2615 // Used to convert frequent JVM_Yield() to nops 2616 bool os::dont_yield() { 2617 return DontYieldALot; 2618 } 2619 2620 void os::naked_yield() { 2621 sched_yield(); 2622 } 2623 2624 //////////////////////////////////////////////////////////////////////////////// 2625 // thread priority support 2626 2627 // From AIX manpage to pthread_setschedparam 2628 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2629 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2630 // 2631 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2632 // range from 40 to 80, where 40 is the least favored priority and 80 2633 // is the most favored." 2634 // 2635 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2636 // scheduling there; however, this still leaves iSeries.) 2637 // 2638 // We use the same values for AIX and PASE. 2639 int os::java_to_os_priority[CriticalPriority + 1] = { 2640 54, // 0 Entry should never be used 2641 2642 55, // 1 MinPriority 2643 55, // 2 2644 56, // 3 2645 2646 56, // 4 2647 57, // 5 NormPriority 2648 57, // 6 2649 2650 58, // 7 2651 58, // 8 2652 59, // 9 NearMaxPriority 2653 2654 60, // 10 MaxPriority 2655 2656 60 // 11 CriticalPriority 2657 }; 2658 2659 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2660 if (!UseThreadPriorities) return OS_OK; 2661 pthread_t thr = thread->osthread()->pthread_id(); 2662 int policy = SCHED_OTHER; 2663 struct sched_param param; 2664 param.sched_priority = newpri; 2665 int ret = pthread_setschedparam(thr, policy, ¶m); 2666 2667 if (ret != 0) { 2668 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2669 (int)thr, newpri, ret, os::errno_name(ret)); 2670 } 2671 return (ret == 0) ? OS_OK : OS_ERR; 2672 } 2673 2674 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2675 if (!UseThreadPriorities) { 2676 *priority_ptr = java_to_os_priority[NormPriority]; 2677 return OS_OK; 2678 } 2679 pthread_t thr = thread->osthread()->pthread_id(); 2680 int policy = SCHED_OTHER; 2681 struct sched_param param; 2682 int ret = pthread_getschedparam(thr, &policy, ¶m); 2683 *priority_ptr = param.sched_priority; 2684 2685 return (ret == 0) ? OS_OK : OS_ERR; 2686 } 2687 2688 //////////////////////////////////////////////////////////////////////////////// 2689 // suspend/resume support 2690 2691 // The low-level signal-based suspend/resume support is a remnant from the 2692 // old VM-suspension that used to be for java-suspension, safepoints etc, 2693 // within hotspot. Currently used by JFR's OSThreadSampler 2694 // 2695 // The remaining code is greatly simplified from the more general suspension 2696 // code that used to be used. 2697 // 2698 // The protocol is quite simple: 2699 // - suspend: 2700 // - sends a signal to the target thread 2701 // - polls the suspend state of the osthread using a yield loop 2702 // - target thread signal handler (SR_handler) sets suspend state 2703 // and blocks in sigsuspend until continued 2704 // - resume: 2705 // - sets target osthread state to continue 2706 // - sends signal to end the sigsuspend loop in the SR_handler 2707 // 2708 // Note that the SR_lock plays no role in this suspend/resume protocol, 2709 // but is checked for NULL in SR_handler as a thread termination indicator. 2710 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2711 // 2712 // Note that resume_clear_context() and suspend_save_context() are needed 2713 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2714 // which in part is used by: 2715 // - Forte Analyzer: AsyncGetCallTrace() 2716 // - StackBanging: get_frame_at_stack_banging_point() 2717 2718 static void resume_clear_context(OSThread *osthread) { 2719 osthread->set_ucontext(NULL); 2720 osthread->set_siginfo(NULL); 2721 } 2722 2723 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2724 osthread->set_ucontext(context); 2725 osthread->set_siginfo(siginfo); 2726 } 2727 2728 // 2729 // Handler function invoked when a thread's execution is suspended or 2730 // resumed. We have to be careful that only async-safe functions are 2731 // called here (Note: most pthread functions are not async safe and 2732 // should be avoided.) 2733 // 2734 // Note: sigwait() is a more natural fit than sigsuspend() from an 2735 // interface point of view, but sigwait() prevents the signal hander 2736 // from being run. libpthread would get very confused by not having 2737 // its signal handlers run and prevents sigwait()'s use with the 2738 // mutex granting granting signal. 2739 // 2740 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2741 // 2742 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2743 // Save and restore errno to avoid confusing native code with EINTR 2744 // after sigsuspend. 2745 int old_errno = errno; 2746 2747 Thread* thread = Thread::current_or_null_safe(); 2748 assert(thread != NULL, "Missing current thread in SR_handler"); 2749 2750 // On some systems we have seen signal delivery get "stuck" until the signal 2751 // mask is changed as part of thread termination. Check that the current thread 2752 // has not already terminated (via SR_lock()) - else the following assertion 2753 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2754 // destructor has completed. 2755 2756 if (thread->SR_lock() == NULL) { 2757 return; 2758 } 2759 2760 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2761 2762 OSThread* osthread = thread->osthread(); 2763 2764 os::SuspendResume::State current = osthread->sr.state(); 2765 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2766 suspend_save_context(osthread, siginfo, context); 2767 2768 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2769 os::SuspendResume::State state = osthread->sr.suspended(); 2770 if (state == os::SuspendResume::SR_SUSPENDED) { 2771 sigset_t suspend_set; // signals for sigsuspend() 2772 2773 // get current set of blocked signals and unblock resume signal 2774 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2775 sigdelset(&suspend_set, SR_signum); 2776 2777 // wait here until we are resumed 2778 while (1) { 2779 sigsuspend(&suspend_set); 2780 2781 os::SuspendResume::State result = osthread->sr.running(); 2782 if (result == os::SuspendResume::SR_RUNNING) { 2783 break; 2784 } 2785 } 2786 2787 } else if (state == os::SuspendResume::SR_RUNNING) { 2788 // request was cancelled, continue 2789 } else { 2790 ShouldNotReachHere(); 2791 } 2792 2793 resume_clear_context(osthread); 2794 } else if (current == os::SuspendResume::SR_RUNNING) { 2795 // request was cancelled, continue 2796 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2797 // ignore 2798 } else { 2799 ShouldNotReachHere(); 2800 } 2801 2802 errno = old_errno; 2803 } 2804 2805 static int SR_initialize() { 2806 struct sigaction act; 2807 char *s; 2808 // Get signal number to use for suspend/resume 2809 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2810 int sig = ::strtol(s, 0, 10); 2811 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2812 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2813 SR_signum = sig; 2814 } else { 2815 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2816 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2817 } 2818 } 2819 2820 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2821 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2822 2823 sigemptyset(&SR_sigset); 2824 sigaddset(&SR_sigset, SR_signum); 2825 2826 // Set up signal handler for suspend/resume. 2827 act.sa_flags = SA_RESTART|SA_SIGINFO; 2828 act.sa_handler = (void (*)(int)) SR_handler; 2829 2830 // SR_signum is blocked by default. 2831 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2832 2833 if (sigaction(SR_signum, &act, 0) == -1) { 2834 return -1; 2835 } 2836 2837 // Save signal flag 2838 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2839 return 0; 2840 } 2841 2842 static int SR_finalize() { 2843 return 0; 2844 } 2845 2846 static int sr_notify(OSThread* osthread) { 2847 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2848 assert_status(status == 0, status, "pthread_kill"); 2849 return status; 2850 } 2851 2852 // "Randomly" selected value for how long we want to spin 2853 // before bailing out on suspending a thread, also how often 2854 // we send a signal to a thread we want to resume 2855 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2856 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2857 2858 // returns true on success and false on error - really an error is fatal 2859 // but this seems the normal response to library errors 2860 static bool do_suspend(OSThread* osthread) { 2861 assert(osthread->sr.is_running(), "thread should be running"); 2862 // mark as suspended and send signal 2863 2864 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2865 // failed to switch, state wasn't running? 2866 ShouldNotReachHere(); 2867 return false; 2868 } 2869 2870 if (sr_notify(osthread) != 0) { 2871 // try to cancel, switch to running 2872 2873 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2874 if (result == os::SuspendResume::SR_RUNNING) { 2875 // cancelled 2876 return false; 2877 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2878 // somehow managed to suspend 2879 return true; 2880 } else { 2881 ShouldNotReachHere(); 2882 return false; 2883 } 2884 } 2885 2886 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2887 2888 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2889 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2890 os::naked_yield(); 2891 } 2892 2893 // timeout, try to cancel the request 2894 if (n >= RANDOMLY_LARGE_INTEGER) { 2895 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2896 if (cancelled == os::SuspendResume::SR_RUNNING) { 2897 return false; 2898 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2899 return true; 2900 } else { 2901 ShouldNotReachHere(); 2902 return false; 2903 } 2904 } 2905 } 2906 2907 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2908 return true; 2909 } 2910 2911 static void do_resume(OSThread* osthread) { 2912 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2913 2914 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2915 // failed to switch to WAKEUP_REQUEST 2916 ShouldNotReachHere(); 2917 return; 2918 } 2919 2920 while (!osthread->sr.is_running()) { 2921 if (sr_notify(osthread) == 0) { 2922 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2923 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2924 os::naked_yield(); 2925 } 2926 } 2927 } else { 2928 ShouldNotReachHere(); 2929 } 2930 } 2931 2932 guarantee(osthread->sr.is_running(), "Must be running!"); 2933 } 2934 2935 /////////////////////////////////////////////////////////////////////////////////// 2936 // signal handling (except suspend/resume) 2937 2938 // This routine may be used by user applications as a "hook" to catch signals. 2939 // The user-defined signal handler must pass unrecognized signals to this 2940 // routine, and if it returns true (non-zero), then the signal handler must 2941 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2942 // routine will never retun false (zero), but instead will execute a VM panic 2943 // routine kill the process. 2944 // 2945 // If this routine returns false, it is OK to call it again. This allows 2946 // the user-defined signal handler to perform checks either before or after 2947 // the VM performs its own checks. Naturally, the user code would be making 2948 // a serious error if it tried to handle an exception (such as a null check 2949 // or breakpoint) that the VM was generating for its own correct operation. 2950 // 2951 // This routine may recognize any of the following kinds of signals: 2952 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2953 // It should be consulted by handlers for any of those signals. 2954 // 2955 // The caller of this routine must pass in the three arguments supplied 2956 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2957 // field of the structure passed to sigaction(). This routine assumes that 2958 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2959 // 2960 // Note that the VM will print warnings if it detects conflicting signal 2961 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2962 // 2963 extern "C" JNIEXPORT int 2964 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 2965 2966 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 2967 // to be the thing to call; documentation is not terribly clear about whether 2968 // pthread_sigmask also works, and if it does, whether it does the same. 2969 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 2970 const int rc = ::pthread_sigmask(how, set, oset); 2971 // return value semantics differ slightly for error case: 2972 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 2973 // (so, pthread_sigmask is more theadsafe for error handling) 2974 // But success is always 0. 2975 return rc == 0 ? true : false; 2976 } 2977 2978 // Function to unblock all signals which are, according 2979 // to POSIX, typical program error signals. If they happen while being blocked, 2980 // they typically will bring down the process immediately. 2981 bool unblock_program_error_signals() { 2982 sigset_t set; 2983 ::sigemptyset(&set); 2984 ::sigaddset(&set, SIGILL); 2985 ::sigaddset(&set, SIGBUS); 2986 ::sigaddset(&set, SIGFPE); 2987 ::sigaddset(&set, SIGSEGV); 2988 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 2989 } 2990 2991 // Renamed from 'signalHandler' to avoid collision with other shared libs. 2992 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 2993 assert(info != NULL && uc != NULL, "it must be old kernel"); 2994 2995 // Never leave program error signals blocked; 2996 // on all our platforms they would bring down the process immediately when 2997 // getting raised while being blocked. 2998 unblock_program_error_signals(); 2999 3000 int orig_errno = errno; // Preserve errno value over signal handler. 3001 JVM_handle_aix_signal(sig, info, uc, true); 3002 errno = orig_errno; 3003 } 3004 3005 // This boolean allows users to forward their own non-matching signals 3006 // to JVM_handle_aix_signal, harmlessly. 3007 bool os::Aix::signal_handlers_are_installed = false; 3008 3009 // For signal-chaining 3010 bool os::Aix::libjsig_is_loaded = false; 3011 typedef struct sigaction *(*get_signal_t)(int); 3012 get_signal_t os::Aix::get_signal_action = NULL; 3013 3014 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3015 struct sigaction *actp = NULL; 3016 3017 if (libjsig_is_loaded) { 3018 // Retrieve the old signal handler from libjsig 3019 actp = (*get_signal_action)(sig); 3020 } 3021 if (actp == NULL) { 3022 // Retrieve the preinstalled signal handler from jvm 3023 actp = os::Posix::get_preinstalled_handler(sig); 3024 } 3025 3026 return actp; 3027 } 3028 3029 static bool call_chained_handler(struct sigaction *actp, int sig, 3030 siginfo_t *siginfo, void *context) { 3031 // Call the old signal handler 3032 if (actp->sa_handler == SIG_DFL) { 3033 // It's more reasonable to let jvm treat it as an unexpected exception 3034 // instead of taking the default action. 3035 return false; 3036 } else if (actp->sa_handler != SIG_IGN) { 3037 if ((actp->sa_flags & SA_NODEFER) == 0) { 3038 // automaticlly block the signal 3039 sigaddset(&(actp->sa_mask), sig); 3040 } 3041 3042 sa_handler_t hand = NULL; 3043 sa_sigaction_t sa = NULL; 3044 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3045 // retrieve the chained handler 3046 if (siginfo_flag_set) { 3047 sa = actp->sa_sigaction; 3048 } else { 3049 hand = actp->sa_handler; 3050 } 3051 3052 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3053 actp->sa_handler = SIG_DFL; 3054 } 3055 3056 // try to honor the signal mask 3057 sigset_t oset; 3058 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3059 3060 // call into the chained handler 3061 if (siginfo_flag_set) { 3062 (*sa)(sig, siginfo, context); 3063 } else { 3064 (*hand)(sig); 3065 } 3066 3067 // restore the signal mask 3068 pthread_sigmask(SIG_SETMASK, &oset, 0); 3069 } 3070 // Tell jvm's signal handler the signal is taken care of. 3071 return true; 3072 } 3073 3074 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3075 bool chained = false; 3076 // signal-chaining 3077 if (UseSignalChaining) { 3078 struct sigaction *actp = get_chained_signal_action(sig); 3079 if (actp != NULL) { 3080 chained = call_chained_handler(actp, sig, siginfo, context); 3081 } 3082 } 3083 return chained; 3084 } 3085 3086 // for diagnostic 3087 int sigflags[NSIG]; 3088 3089 int os::Aix::get_our_sigflags(int sig) { 3090 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3091 return sigflags[sig]; 3092 } 3093 3094 void os::Aix::set_our_sigflags(int sig, int flags) { 3095 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3096 if (sig > 0 && sig < NSIG) { 3097 sigflags[sig] = flags; 3098 } 3099 } 3100 3101 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3102 // Check for overwrite. 3103 struct sigaction oldAct; 3104 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3105 3106 void* oldhand = oldAct.sa_sigaction 3107 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3108 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3109 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3110 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3111 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3112 if (AllowUserSignalHandlers || !set_installed) { 3113 // Do not overwrite; user takes responsibility to forward to us. 3114 return; 3115 } else if (UseSignalChaining) { 3116 // save the old handler in jvm 3117 os::Posix::save_preinstalled_handler(sig, oldAct); 3118 // libjsig also interposes the sigaction() call below and saves the 3119 // old sigaction on it own. 3120 } else { 3121 fatal("Encountered unexpected pre-existing sigaction handler " 3122 "%#lx for signal %d.", (long)oldhand, sig); 3123 } 3124 } 3125 3126 struct sigaction sigAct; 3127 sigfillset(&(sigAct.sa_mask)); 3128 if (!set_installed) { 3129 sigAct.sa_handler = SIG_DFL; 3130 sigAct.sa_flags = SA_RESTART; 3131 } else { 3132 sigAct.sa_sigaction = javaSignalHandler; 3133 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3134 } 3135 // Save flags, which are set by ours 3136 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3137 sigflags[sig] = sigAct.sa_flags; 3138 3139 int ret = sigaction(sig, &sigAct, &oldAct); 3140 assert(ret == 0, "check"); 3141 3142 void* oldhand2 = oldAct.sa_sigaction 3143 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3144 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3145 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3146 } 3147 3148 // install signal handlers for signals that HotSpot needs to 3149 // handle in order to support Java-level exception handling. 3150 void os::Aix::install_signal_handlers() { 3151 if (!signal_handlers_are_installed) { 3152 signal_handlers_are_installed = true; 3153 3154 // signal-chaining 3155 typedef void (*signal_setting_t)(); 3156 signal_setting_t begin_signal_setting = NULL; 3157 signal_setting_t end_signal_setting = NULL; 3158 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3159 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3160 if (begin_signal_setting != NULL) { 3161 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3162 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3163 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3164 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3165 libjsig_is_loaded = true; 3166 assert(UseSignalChaining, "should enable signal-chaining"); 3167 } 3168 if (libjsig_is_loaded) { 3169 // Tell libjsig jvm is setting signal handlers. 3170 (*begin_signal_setting)(); 3171 } 3172 3173 set_signal_handler(SIGSEGV, true); 3174 set_signal_handler(SIGPIPE, true); 3175 set_signal_handler(SIGBUS, true); 3176 set_signal_handler(SIGILL, true); 3177 set_signal_handler(SIGFPE, true); 3178 set_signal_handler(SIGTRAP, true); 3179 set_signal_handler(SIGXFSZ, true); 3180 3181 if (libjsig_is_loaded) { 3182 // Tell libjsig jvm finishes setting signal handlers. 3183 (*end_signal_setting)(); 3184 } 3185 3186 // We don't activate signal checker if libjsig is in place, we trust ourselves 3187 // and if UserSignalHandler is installed all bets are off. 3188 // Log that signal checking is off only if -verbose:jni is specified. 3189 if (CheckJNICalls) { 3190 if (libjsig_is_loaded) { 3191 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3192 check_signals = false; 3193 } 3194 if (AllowUserSignalHandlers) { 3195 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3196 check_signals = false; 3197 } 3198 // Need to initialize check_signal_done. 3199 ::sigemptyset(&check_signal_done); 3200 } 3201 } 3202 } 3203 3204 static const char* get_signal_handler_name(address handler, 3205 char* buf, int buflen) { 3206 int offset; 3207 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3208 if (found) { 3209 // skip directory names 3210 const char *p1, *p2; 3211 p1 = buf; 3212 size_t len = strlen(os::file_separator()); 3213 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3214 // The way os::dll_address_to_library_name is implemented on Aix 3215 // right now, it always returns -1 for the offset which is not 3216 // terribly informative. 3217 // Will fix that. For now, omit the offset. 3218 jio_snprintf(buf, buflen, "%s", p1); 3219 } else { 3220 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3221 } 3222 return buf; 3223 } 3224 3225 static void print_signal_handler(outputStream* st, int sig, 3226 char* buf, size_t buflen) { 3227 struct sigaction sa; 3228 sigaction(sig, NULL, &sa); 3229 3230 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3231 3232 address handler = (sa.sa_flags & SA_SIGINFO) 3233 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3234 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3235 3236 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3237 st->print("SIG_DFL"); 3238 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3239 st->print("SIG_IGN"); 3240 } else { 3241 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3242 } 3243 3244 // Print readable mask. 3245 st->print(", sa_mask[0]="); 3246 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3247 3248 address rh = VMError::get_resetted_sighandler(sig); 3249 // May be, handler was resetted by VMError? 3250 if (rh != NULL) { 3251 handler = rh; 3252 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3253 } 3254 3255 // Print textual representation of sa_flags. 3256 st->print(", sa_flags="); 3257 os::Posix::print_sa_flags(st, sa.sa_flags); 3258 3259 // Check: is it our handler? 3260 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3261 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3262 // It is our signal handler. 3263 // Check for flags, reset system-used one! 3264 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3265 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3266 os::Aix::get_our_sigflags(sig)); 3267 } 3268 } 3269 st->cr(); 3270 } 3271 3272 #define DO_SIGNAL_CHECK(sig) \ 3273 if (!sigismember(&check_signal_done, sig)) \ 3274 os::Aix::check_signal_handler(sig) 3275 3276 // This method is a periodic task to check for misbehaving JNI applications 3277 // under CheckJNI, we can add any periodic checks here 3278 3279 void os::run_periodic_checks() { 3280 3281 if (check_signals == false) return; 3282 3283 // SEGV and BUS if overridden could potentially prevent 3284 // generation of hs*.log in the event of a crash, debugging 3285 // such a case can be very challenging, so we absolutely 3286 // check the following for a good measure: 3287 DO_SIGNAL_CHECK(SIGSEGV); 3288 DO_SIGNAL_CHECK(SIGILL); 3289 DO_SIGNAL_CHECK(SIGFPE); 3290 DO_SIGNAL_CHECK(SIGBUS); 3291 DO_SIGNAL_CHECK(SIGPIPE); 3292 DO_SIGNAL_CHECK(SIGXFSZ); 3293 if (UseSIGTRAP) { 3294 DO_SIGNAL_CHECK(SIGTRAP); 3295 } 3296 3297 // ReduceSignalUsage allows the user to override these handlers 3298 // see comments at the very top and jvm_md.h 3299 if (!ReduceSignalUsage) { 3300 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3301 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3302 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3303 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3304 } 3305 3306 DO_SIGNAL_CHECK(SR_signum); 3307 } 3308 3309 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3310 3311 static os_sigaction_t os_sigaction = NULL; 3312 3313 void os::Aix::check_signal_handler(int sig) { 3314 char buf[O_BUFLEN]; 3315 address jvmHandler = NULL; 3316 3317 struct sigaction act; 3318 if (os_sigaction == NULL) { 3319 // only trust the default sigaction, in case it has been interposed 3320 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3321 if (os_sigaction == NULL) return; 3322 } 3323 3324 os_sigaction(sig, (struct sigaction*)NULL, &act); 3325 3326 address thisHandler = (act.sa_flags & SA_SIGINFO) 3327 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3328 : CAST_FROM_FN_PTR(address, act.sa_handler); 3329 3330 switch(sig) { 3331 case SIGSEGV: 3332 case SIGBUS: 3333 case SIGFPE: 3334 case SIGPIPE: 3335 case SIGILL: 3336 case SIGXFSZ: 3337 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3338 break; 3339 3340 case SHUTDOWN1_SIGNAL: 3341 case SHUTDOWN2_SIGNAL: 3342 case SHUTDOWN3_SIGNAL: 3343 case BREAK_SIGNAL: 3344 jvmHandler = (address)user_handler(); 3345 break; 3346 3347 default: 3348 if (sig == SR_signum) { 3349 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3350 } else { 3351 return; 3352 } 3353 break; 3354 } 3355 3356 if (thisHandler != jvmHandler) { 3357 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3358 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3359 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3360 // No need to check this sig any longer 3361 sigaddset(&check_signal_done, sig); 3362 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3363 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3364 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3365 exception_name(sig, buf, O_BUFLEN)); 3366 } 3367 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3368 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3369 tty->print("expected:"); 3370 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3371 tty->cr(); 3372 tty->print(" found:"); 3373 os::Posix::print_sa_flags(tty, act.sa_flags); 3374 tty->cr(); 3375 // No need to check this sig any longer 3376 sigaddset(&check_signal_done, sig); 3377 } 3378 3379 // Dump all the signal 3380 if (sigismember(&check_signal_done, sig)) { 3381 print_signal_handlers(tty, buf, O_BUFLEN); 3382 } 3383 } 3384 3385 // To install functions for atexit system call 3386 extern "C" { 3387 static void perfMemory_exit_helper() { 3388 perfMemory_exit(); 3389 } 3390 } 3391 3392 // This is called _before_ the most of global arguments have been parsed. 3393 void os::init(void) { 3394 // This is basic, we want to know if that ever changes. 3395 // (Shared memory boundary is supposed to be a 256M aligned.) 3396 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3397 3398 // Record process break at startup. 3399 g_brk_at_startup = (address) ::sbrk(0); 3400 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3401 3402 // First off, we need to know whether we run on AIX or PASE, and 3403 // the OS level we run on. 3404 os::Aix::initialize_os_info(); 3405 3406 // Scan environment (SPEC1170 behaviour, etc). 3407 os::Aix::scan_environment(); 3408 3409 // Probe multipage support. 3410 query_multipage_support(); 3411 3412 // Act like we only have one page size by eliminating corner cases which 3413 // we did not support very well anyway. 3414 // We have two input conditions: 3415 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3416 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3417 // setting. 3418 // Data segment page size is important for us because it defines the thread stack page 3419 // size, which is needed for guard page handling, stack banging etc. 3420 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3421 // and should be allocated with 64k pages. 3422 // 3423 // So, we do the following: 3424 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3425 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3426 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3427 // 64k no --- AIX 5.2 ? --- 3428 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3429 3430 // We explicitly leave no option to change page size, because only upgrading would work, 3431 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3432 3433 if (g_multipage_support.datapsize == 4*K) { 3434 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3435 if (g_multipage_support.can_use_64K_pages) { 3436 // .. but we are able to use 64K pages dynamically. 3437 // This would be typical for java launchers which are not linked 3438 // with datapsize=64K (like, any other launcher but our own). 3439 // 3440 // In this case it would be smart to allocate the java heap with 64K 3441 // to get the performance benefit, and to fake 64k pages for the 3442 // data segment (when dealing with thread stacks). 3443 // 3444 // However, leave a possibility to downgrade to 4K, using 3445 // -XX:-Use64KPages. 3446 if (Use64KPages) { 3447 trcVerbose("64K page mode (faked for data segment)"); 3448 Aix::_page_size = 64*K; 3449 } else { 3450 trcVerbose("4K page mode (Use64KPages=off)"); 3451 Aix::_page_size = 4*K; 3452 } 3453 } else { 3454 // .. and not able to allocate 64k pages dynamically. Here, just 3455 // fall back to 4K paged mode and use mmap for everything. 3456 trcVerbose("4K page mode"); 3457 Aix::_page_size = 4*K; 3458 FLAG_SET_ERGO(Use64KPages, false); 3459 } 3460 } else { 3461 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3462 // This normally means that we can allocate 64k pages dynamically. 3463 // (There is one special case where this may be false: EXTSHM=on. 3464 // but we decided to not support that mode). 3465 assert0(g_multipage_support.can_use_64K_pages); 3466 Aix::_page_size = 64*K; 3467 trcVerbose("64K page mode"); 3468 FLAG_SET_ERGO(Use64KPages, true); 3469 } 3470 3471 // For now UseLargePages is just ignored. 3472 FLAG_SET_ERGO(UseLargePages, false); 3473 _page_sizes[0] = 0; 3474 3475 // debug trace 3476 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3477 3478 // Next, we need to initialize libo4 and libperfstat libraries. 3479 if (os::Aix::on_pase()) { 3480 os::Aix::initialize_libo4(); 3481 } else { 3482 os::Aix::initialize_libperfstat(); 3483 } 3484 3485 // Reset the perfstat information provided by ODM. 3486 if (os::Aix::on_aix()) { 3487 libperfstat::perfstat_reset(); 3488 } 3489 3490 // Now initialze basic system properties. Note that for some of the values we 3491 // need libperfstat etc. 3492 os::Aix::initialize_system_info(); 3493 3494 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3495 3496 init_random(1234567); 3497 3498 // _main_thread points to the thread that created/loaded the JVM. 3499 Aix::_main_thread = pthread_self(); 3500 3501 initial_time_count = os::elapsed_counter(); 3502 3503 os::Posix::init(); 3504 } 3505 3506 // This is called _after_ the global arguments have been parsed. 3507 jint os::init_2(void) { 3508 3509 // This could be set after os::Posix::init() but all platforms 3510 // have to set it the same so we have to mirror Solaris. 3511 DEBUG_ONLY(os::set_mutex_init_done();) 3512 3513 os::Posix::init_2(); 3514 3515 if (os::Aix::on_pase()) { 3516 trcVerbose("Running on PASE."); 3517 } else { 3518 trcVerbose("Running on AIX (not PASE)."); 3519 } 3520 3521 trcVerbose("processor count: %d", os::_processor_count); 3522 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3523 3524 // Initially build up the loaded dll map. 3525 LoadedLibraries::reload(); 3526 if (Verbose) { 3527 trcVerbose("Loaded Libraries: "); 3528 LoadedLibraries::print(tty); 3529 } 3530 3531 // initialize suspend/resume support - must do this before signal_sets_init() 3532 if (SR_initialize() != 0) { 3533 perror("SR_initialize failed"); 3534 return JNI_ERR; 3535 } 3536 3537 Aix::signal_sets_init(); 3538 Aix::install_signal_handlers(); 3539 // Initialize data for jdk.internal.misc.Signal 3540 if (!ReduceSignalUsage) { 3541 jdk_misc_signal_init(); 3542 } 3543 3544 // Check and sets minimum stack sizes against command line options 3545 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3546 return JNI_ERR; 3547 } 3548 3549 if (UseNUMA) { 3550 UseNUMA = false; 3551 warning("NUMA optimizations are not available on this OS."); 3552 } 3553 3554 if (MaxFDLimit) { 3555 // Set the number of file descriptors to max. print out error 3556 // if getrlimit/setrlimit fails but continue regardless. 3557 struct rlimit nbr_files; 3558 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3559 if (status != 0) { 3560 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3561 } else { 3562 nbr_files.rlim_cur = nbr_files.rlim_max; 3563 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3564 if (status != 0) { 3565 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3566 } 3567 } 3568 } 3569 3570 if (PerfAllowAtExitRegistration) { 3571 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3572 // At exit functions can be delayed until process exit time, which 3573 // can be problematic for embedded VM situations. Embedded VMs should 3574 // call DestroyJavaVM() to assure that VM resources are released. 3575 3576 // Note: perfMemory_exit_helper atexit function may be removed in 3577 // the future if the appropriate cleanup code can be added to the 3578 // VM_Exit VMOperation's doit method. 3579 if (atexit(perfMemory_exit_helper) != 0) { 3580 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3581 } 3582 } 3583 3584 return JNI_OK; 3585 } 3586 3587 // Mark the polling page as unreadable 3588 void os::make_polling_page_unreadable(void) { 3589 if (!guard_memory((char*)_polling_page, Aix::page_size())) { 3590 fatal("Could not disable polling page"); 3591 } 3592 }; 3593 3594 // Mark the polling page as readable 3595 void os::make_polling_page_readable(void) { 3596 // Changed according to os_linux.cpp. 3597 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { 3598 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page); 3599 } 3600 }; 3601 3602 int os::active_processor_count() { 3603 // User has overridden the number of active processors 3604 if (ActiveProcessorCount > 0) { 3605 log_trace(os)("active_processor_count: " 3606 "active processor count set by user : %d", 3607 ActiveProcessorCount); 3608 return ActiveProcessorCount; 3609 } 3610 3611 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3612 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3613 return online_cpus; 3614 } 3615 3616 void os::set_native_thread_name(const char *name) { 3617 // Not yet implemented. 3618 return; 3619 } 3620 3621 bool os::distribute_processes(uint length, uint* distribution) { 3622 // Not yet implemented. 3623 return false; 3624 } 3625 3626 bool os::bind_to_processor(uint processor_id) { 3627 // Not yet implemented. 3628 return false; 3629 } 3630 3631 void os::SuspendedThreadTask::internal_do_task() { 3632 if (do_suspend(_thread->osthread())) { 3633 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3634 do_task(context); 3635 do_resume(_thread->osthread()); 3636 } 3637 } 3638 3639 //////////////////////////////////////////////////////////////////////////////// 3640 // debug support 3641 3642 bool os::find(address addr, outputStream* st) { 3643 3644 st->print(PTR_FORMAT ": ", addr); 3645 3646 loaded_module_t lm; 3647 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3648 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3649 st->print_cr("%s", lm.path); 3650 return true; 3651 } 3652 3653 return false; 3654 } 3655 3656 //////////////////////////////////////////////////////////////////////////////// 3657 // misc 3658 3659 // This does not do anything on Aix. This is basically a hook for being 3660 // able to use structured exception handling (thread-local exception filters) 3661 // on, e.g., Win32. 3662 void 3663 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3664 JavaCallArguments* args, Thread* thread) { 3665 f(value, method, args, thread); 3666 } 3667 3668 void os::print_statistics() { 3669 } 3670 3671 bool os::message_box(const char* title, const char* message) { 3672 int i; 3673 fdStream err(defaultStream::error_fd()); 3674 for (i = 0; i < 78; i++) err.print_raw("="); 3675 err.cr(); 3676 err.print_raw_cr(title); 3677 for (i = 0; i < 78; i++) err.print_raw("-"); 3678 err.cr(); 3679 err.print_raw_cr(message); 3680 for (i = 0; i < 78; i++) err.print_raw("="); 3681 err.cr(); 3682 3683 char buf[16]; 3684 // Prevent process from exiting upon "read error" without consuming all CPU 3685 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3686 3687 return buf[0] == 'y' || buf[0] == 'Y'; 3688 } 3689 3690 // Is a (classpath) directory empty? 3691 bool os::dir_is_empty(const char* path) { 3692 DIR *dir = NULL; 3693 struct dirent *ptr; 3694 3695 dir = opendir(path); 3696 if (dir == NULL) return true; 3697 3698 /* Scan the directory */ 3699 bool result = true; 3700 while (result && (ptr = readdir(dir)) != NULL) { 3701 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3702 result = false; 3703 } 3704 } 3705 closedir(dir); 3706 return result; 3707 } 3708 3709 // This code originates from JDK's sysOpen and open64_w 3710 // from src/solaris/hpi/src/system_md.c 3711 3712 int os::open(const char *path, int oflag, int mode) { 3713 3714 if (strlen(path) > MAX_PATH - 1) { 3715 errno = ENAMETOOLONG; 3716 return -1; 3717 } 3718 int fd; 3719 3720 fd = ::open64(path, oflag, mode); 3721 if (fd == -1) return -1; 3722 3723 // If the open succeeded, the file might still be a directory. 3724 { 3725 struct stat64 buf64; 3726 int ret = ::fstat64(fd, &buf64); 3727 int st_mode = buf64.st_mode; 3728 3729 if (ret != -1) { 3730 if ((st_mode & S_IFMT) == S_IFDIR) { 3731 errno = EISDIR; 3732 ::close(fd); 3733 return -1; 3734 } 3735 } else { 3736 ::close(fd); 3737 return -1; 3738 } 3739 } 3740 3741 // All file descriptors that are opened in the JVM and not 3742 // specifically destined for a subprocess should have the 3743 // close-on-exec flag set. If we don't set it, then careless 3rd 3744 // party native code might fork and exec without closing all 3745 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3746 // UNIXProcess.c), and this in turn might: 3747 // 3748 // - cause end-of-file to fail to be detected on some file 3749 // descriptors, resulting in mysterious hangs, or 3750 // 3751 // - might cause an fopen in the subprocess to fail on a system 3752 // suffering from bug 1085341. 3753 // 3754 // (Yes, the default setting of the close-on-exec flag is a Unix 3755 // design flaw.) 3756 // 3757 // See: 3758 // 1085341: 32-bit stdio routines should support file descriptors >255 3759 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3760 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3761 #ifdef FD_CLOEXEC 3762 { 3763 int flags = ::fcntl(fd, F_GETFD); 3764 if (flags != -1) 3765 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3766 } 3767 #endif 3768 3769 return fd; 3770 } 3771 3772 // create binary file, rewriting existing file if required 3773 int os::create_binary_file(const char* path, bool rewrite_existing) { 3774 int oflags = O_WRONLY | O_CREAT; 3775 if (!rewrite_existing) { 3776 oflags |= O_EXCL; 3777 } 3778 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3779 } 3780 3781 // return current position of file pointer 3782 jlong os::current_file_offset(int fd) { 3783 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3784 } 3785 3786 // move file pointer to the specified offset 3787 jlong os::seek_to_file_offset(int fd, jlong offset) { 3788 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3789 } 3790 3791 // This code originates from JDK's sysAvailable 3792 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3793 3794 int os::available(int fd, jlong *bytes) { 3795 jlong cur, end; 3796 int mode; 3797 struct stat64 buf64; 3798 3799 if (::fstat64(fd, &buf64) >= 0) { 3800 mode = buf64.st_mode; 3801 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3802 int n; 3803 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3804 *bytes = n; 3805 return 1; 3806 } 3807 } 3808 } 3809 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3810 return 0; 3811 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3812 return 0; 3813 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3814 return 0; 3815 } 3816 *bytes = end - cur; 3817 return 1; 3818 } 3819 3820 // Map a block of memory. 3821 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3822 char *addr, size_t bytes, bool read_only, 3823 bool allow_exec) { 3824 int prot; 3825 int flags = MAP_PRIVATE; 3826 3827 if (read_only) { 3828 prot = PROT_READ; 3829 flags = MAP_SHARED; 3830 } else { 3831 prot = PROT_READ | PROT_WRITE; 3832 flags = MAP_PRIVATE; 3833 } 3834 3835 if (allow_exec) { 3836 prot |= PROT_EXEC; 3837 } 3838 3839 if (addr != NULL) { 3840 flags |= MAP_FIXED; 3841 } 3842 3843 // Allow anonymous mappings if 'fd' is -1. 3844 if (fd == -1) { 3845 flags |= MAP_ANONYMOUS; 3846 } 3847 3848 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3849 fd, file_offset); 3850 if (mapped_address == MAP_FAILED) { 3851 return NULL; 3852 } 3853 return mapped_address; 3854 } 3855 3856 // Remap a block of memory. 3857 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3858 char *addr, size_t bytes, bool read_only, 3859 bool allow_exec) { 3860 // same as map_memory() on this OS 3861 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3862 allow_exec); 3863 } 3864 3865 // Unmap a block of memory. 3866 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3867 return munmap(addr, bytes) == 0; 3868 } 3869 3870 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3871 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3872 // of a thread. 3873 // 3874 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3875 // the fast estimate available on the platform. 3876 3877 jlong os::current_thread_cpu_time() { 3878 // return user + sys since the cost is the same 3879 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3880 assert(n >= 0, "negative CPU time"); 3881 return n; 3882 } 3883 3884 jlong os::thread_cpu_time(Thread* thread) { 3885 // consistent with what current_thread_cpu_time() returns 3886 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3887 assert(n >= 0, "negative CPU time"); 3888 return n; 3889 } 3890 3891 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3892 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3893 assert(n >= 0, "negative CPU time"); 3894 return n; 3895 } 3896 3897 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3898 bool error = false; 3899 3900 jlong sys_time = 0; 3901 jlong user_time = 0; 3902 3903 // Reimplemented using getthrds64(). 3904 // 3905 // Works like this: 3906 // For the thread in question, get the kernel thread id. Then get the 3907 // kernel thread statistics using that id. 3908 // 3909 // This only works of course when no pthread scheduling is used, 3910 // i.e. there is a 1:1 relationship to kernel threads. 3911 // On AIX, see AIXTHREAD_SCOPE variable. 3912 3913 pthread_t pthtid = thread->osthread()->pthread_id(); 3914 3915 // retrieve kernel thread id for the pthread: 3916 tid64_t tid = 0; 3917 struct __pthrdsinfo pinfo; 3918 // I just love those otherworldly IBM APIs which force me to hand down 3919 // dummy buffers for stuff I dont care for... 3920 char dummy[1]; 3921 int dummy_size = sizeof(dummy); 3922 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3923 dummy, &dummy_size) == 0) { 3924 tid = pinfo.__pi_tid; 3925 } else { 3926 tty->print_cr("pthread_getthrds_np failed."); 3927 error = true; 3928 } 3929 3930 // retrieve kernel timing info for that kernel thread 3931 if (!error) { 3932 struct thrdentry64 thrdentry; 3933 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 3934 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 3935 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 3936 } else { 3937 tty->print_cr("pthread_getthrds_np failed."); 3938 error = true; 3939 } 3940 } 3941 3942 if (p_sys_time) { 3943 *p_sys_time = sys_time; 3944 } 3945 3946 if (p_user_time) { 3947 *p_user_time = user_time; 3948 } 3949 3950 if (error) { 3951 return false; 3952 } 3953 3954 return true; 3955 } 3956 3957 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3958 jlong sys_time; 3959 jlong user_time; 3960 3961 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 3962 return -1; 3963 } 3964 3965 return user_sys_cpu_time ? sys_time + user_time : user_time; 3966 } 3967 3968 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3969 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3970 info_ptr->may_skip_backward = false; // elapsed time not wall time 3971 info_ptr->may_skip_forward = false; // elapsed time not wall time 3972 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3973 } 3974 3975 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 3976 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 3977 info_ptr->may_skip_backward = false; // elapsed time not wall time 3978 info_ptr->may_skip_forward = false; // elapsed time not wall time 3979 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 3980 } 3981 3982 bool os::is_thread_cpu_time_supported() { 3983 return true; 3984 } 3985 3986 // System loadavg support. Returns -1 if load average cannot be obtained. 3987 // For now just return the system wide load average (no processor sets). 3988 int os::loadavg(double values[], int nelem) { 3989 3990 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 3991 guarantee(values, "argument error"); 3992 3993 if (os::Aix::on_pase()) { 3994 3995 // AS/400 PASE: use libo4 porting library 3996 double v[3] = { 0.0, 0.0, 0.0 }; 3997 3998 if (libo4::get_load_avg(v, v + 1, v + 2)) { 3999 for (int i = 0; i < nelem; i ++) { 4000 values[i] = v[i]; 4001 } 4002 return nelem; 4003 } else { 4004 return -1; 4005 } 4006 4007 } else { 4008 4009 // AIX: use libperfstat 4010 libperfstat::cpuinfo_t ci; 4011 if (libperfstat::get_cpuinfo(&ci)) { 4012 for (int i = 0; i < nelem; i++) { 4013 values[i] = ci.loadavg[i]; 4014 } 4015 } else { 4016 return -1; 4017 } 4018 return nelem; 4019 } 4020 } 4021 4022 void os::pause() { 4023 char filename[MAX_PATH]; 4024 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4025 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4026 } else { 4027 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4028 } 4029 4030 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4031 if (fd != -1) { 4032 struct stat buf; 4033 ::close(fd); 4034 while (::stat(filename, &buf) == 0) { 4035 (void)::poll(NULL, 0, 100); 4036 } 4037 } else { 4038 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4039 } 4040 } 4041 4042 bool os::is_primordial_thread(void) { 4043 if (pthread_self() == (pthread_t)1) { 4044 return true; 4045 } else { 4046 return false; 4047 } 4048 } 4049 4050 // OS recognitions (PASE/AIX, OS level) call this before calling any 4051 // one of Aix::on_pase(), Aix::os_version() static 4052 void os::Aix::initialize_os_info() { 4053 4054 assert(_on_pase == -1 && _os_version == 0, "already called."); 4055 4056 struct utsname uts; 4057 memset(&uts, 0, sizeof(uts)); 4058 strcpy(uts.sysname, "?"); 4059 if (::uname(&uts) == -1) { 4060 trcVerbose("uname failed (%d)", errno); 4061 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4062 } else { 4063 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4064 "node \"%s\" machine \"%s\"\n", 4065 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4066 const int major = atoi(uts.version); 4067 assert(major > 0, "invalid OS version"); 4068 const int minor = atoi(uts.release); 4069 assert(minor > 0, "invalid OS release"); 4070 _os_version = (major << 24) | (minor << 16); 4071 char ver_str[20] = {0}; 4072 const char* name_str = "unknown OS"; 4073 if (strcmp(uts.sysname, "OS400") == 0) { 4074 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4075 _on_pase = 1; 4076 if (os_version_short() < 0x0504) { 4077 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4078 assert(false, "OS/400 release too old."); 4079 } 4080 name_str = "OS/400 (pase)"; 4081 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4082 } else if (strcmp(uts.sysname, "AIX") == 0) { 4083 // We run on AIX. We do not support versions older than AIX 7.1. 4084 _on_pase = 0; 4085 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4086 odmWrapper::determine_os_kernel_version(&_os_version); 4087 if (os_version_short() < 0x0701) { 4088 trcVerbose("AIX releases older than AIX 7.1 are not supported."); 4089 assert(false, "AIX release too old."); 4090 } 4091 name_str = "AIX"; 4092 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4093 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4094 } else { 4095 assert(false, "%s", name_str); 4096 } 4097 trcVerbose("We run on %s %s", name_str, ver_str); 4098 } 4099 4100 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4101 } // end: os::Aix::initialize_os_info() 4102 4103 // Scan environment for important settings which might effect the VM. 4104 // Trace out settings. Warn about invalid settings and/or correct them. 4105 // 4106 // Must run after os::Aix::initialue_os_info(). 4107 void os::Aix::scan_environment() { 4108 4109 char* p; 4110 int rc; 4111 4112 // Warn explicity if EXTSHM=ON is used. That switch changes how 4113 // System V shared memory behaves. One effect is that page size of 4114 // shared memory cannot be change dynamically, effectivly preventing 4115 // large pages from working. 4116 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4117 // recommendation is (in OSS notes) to switch it off. 4118 p = ::getenv("EXTSHM"); 4119 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4120 if (p && strcasecmp(p, "ON") == 0) { 4121 _extshm = 1; 4122 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4123 if (!AllowExtshm) { 4124 // We allow under certain conditions the user to continue. However, we want this 4125 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4126 // that the VM is not able to allocate 64k pages for the heap. 4127 // We do not want to run with reduced performance. 4128 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4129 } 4130 } else { 4131 _extshm = 0; 4132 } 4133 4134 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4135 // Not tested, not supported. 4136 // 4137 // Note that it might be worth the trouble to test and to require it, if only to 4138 // get useful return codes for mprotect. 4139 // 4140 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4141 // exec() ? before loading the libjvm ? ....) 4142 p = ::getenv("XPG_SUS_ENV"); 4143 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4144 if (p && strcmp(p, "ON") == 0) { 4145 _xpg_sus_mode = 1; 4146 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4147 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4148 // clobber address ranges. If we ever want to support that, we have to do some 4149 // testing first. 4150 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4151 } else { 4152 _xpg_sus_mode = 0; 4153 } 4154 4155 if (os::Aix::on_pase()) { 4156 p = ::getenv("QIBM_MULTI_THREADED"); 4157 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4158 } 4159 4160 p = ::getenv("LDR_CNTRL"); 4161 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4162 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4163 if (p && ::strstr(p, "TEXTPSIZE")) { 4164 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4165 "you may experience hangs or crashes on OS/400 V7R1."); 4166 } 4167 } 4168 4169 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4170 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4171 4172 } // end: os::Aix::scan_environment() 4173 4174 // PASE: initialize the libo4 library (PASE porting library). 4175 void os::Aix::initialize_libo4() { 4176 guarantee(os::Aix::on_pase(), "OS/400 only."); 4177 if (!libo4::init()) { 4178 trcVerbose("libo4 initialization failed."); 4179 assert(false, "libo4 initialization failed"); 4180 } else { 4181 trcVerbose("libo4 initialized."); 4182 } 4183 } 4184 4185 // AIX: initialize the libperfstat library. 4186 void os::Aix::initialize_libperfstat() { 4187 assert(os::Aix::on_aix(), "AIX only"); 4188 if (!libperfstat::init()) { 4189 trcVerbose("libperfstat initialization failed."); 4190 assert(false, "libperfstat initialization failed"); 4191 } else { 4192 trcVerbose("libperfstat initialized."); 4193 } 4194 } 4195 4196 ///////////////////////////////////////////////////////////////////////////// 4197 // thread stack 4198 4199 // Get the current stack base from the OS (actually, the pthread library). 4200 // Note: usually not page aligned. 4201 address os::current_stack_base() { 4202 AixMisc::stackbounds_t bounds; 4203 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4204 guarantee(rc, "Unable to retrieve stack bounds."); 4205 return bounds.base; 4206 } 4207 4208 // Get the current stack size from the OS (actually, the pthread library). 4209 // Returned size is such that (base - size) is always aligned to page size. 4210 size_t os::current_stack_size() { 4211 AixMisc::stackbounds_t bounds; 4212 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4213 guarantee(rc, "Unable to retrieve stack bounds."); 4214 // Align the returned stack size such that the stack low address 4215 // is aligned to page size (Note: base is usually not and we do not care). 4216 // We need to do this because caller code will assume stack low address is 4217 // page aligned and will place guard pages without checking. 4218 address low = bounds.base - bounds.size; 4219 address low_aligned = (address)align_up(low, os::vm_page_size()); 4220 size_t s = bounds.base - low_aligned; 4221 return s; 4222 } 4223 4224 extern char** environ; 4225 4226 // Run the specified command in a separate process. Return its exit value, 4227 // or -1 on failure (e.g. can't fork a new process). 4228 // Unlike system(), this function can be called from signal handler. It 4229 // doesn't block SIGINT et al. 4230 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 4231 char * argv[4] = {"sh", "-c", cmd, NULL}; 4232 4233 pid_t pid = fork(); 4234 4235 if (pid < 0) { 4236 // fork failed 4237 return -1; 4238 4239 } else if (pid == 0) { 4240 // child process 4241 4242 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4243 execve("/usr/bin/sh", argv, environ); 4244 4245 // execve failed 4246 _exit(-1); 4247 4248 } else { 4249 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4250 // care about the actual exit code, for now. 4251 4252 int status; 4253 4254 // Wait for the child process to exit. This returns immediately if 4255 // the child has already exited. */ 4256 while (waitpid(pid, &status, 0) < 0) { 4257 switch (errno) { 4258 case ECHILD: return 0; 4259 case EINTR: break; 4260 default: return -1; 4261 } 4262 } 4263 4264 if (WIFEXITED(status)) { 4265 // The child exited normally; get its exit code. 4266 return WEXITSTATUS(status); 4267 } else if (WIFSIGNALED(status)) { 4268 // The child exited because of a signal. 4269 // The best value to return is 0x80 + signal number, 4270 // because that is what all Unix shells do, and because 4271 // it allows callers to distinguish between process exit and 4272 // process death by signal. 4273 return 0x80 + WTERMSIG(status); 4274 } else { 4275 // Unknown exit code; pass it through. 4276 return status; 4277 } 4278 } 4279 return -1; 4280 } 4281 4282 // Get the default path to the core file 4283 // Returns the length of the string 4284 int os::get_core_path(char* buffer, size_t bufferSize) { 4285 const char* p = get_current_directory(buffer, bufferSize); 4286 4287 if (p == NULL) { 4288 assert(p != NULL, "failed to get current directory"); 4289 return 0; 4290 } 4291 4292 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4293 p, current_process_id()); 4294 4295 return strlen(buffer); 4296 } 4297 4298 #ifndef PRODUCT 4299 void TestReserveMemorySpecial_test() { 4300 // No tests available for this platform 4301 } 4302 #endif 4303 4304 bool os::start_debugging(char *buf, int buflen) { 4305 int len = (int)strlen(buf); 4306 char *p = &buf[len]; 4307 4308 jio_snprintf(p, buflen -len, 4309 "\n\n" 4310 "Do you want to debug the problem?\n\n" 4311 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4312 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4313 "Otherwise, press RETURN to abort...", 4314 os::current_process_id(), 4315 os::current_thread_id(), thread_self()); 4316 4317 bool yes = os::message_box("Unexpected Error", buf); 4318 4319 if (yes) { 4320 // yes, user asked VM to launch debugger 4321 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4322 4323 os::fork_and_exec(buf); 4324 yes = false; 4325 } 4326 return yes; 4327 } 4328 4329 static inline time_t get_mtime(const char* filename) { 4330 struct stat st; 4331 int ret = os::stat(filename, &st); 4332 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 4333 return st.st_mtime; 4334 } 4335 4336 int os::compare_file_modified_times(const char* file1, const char* file2) { 4337 time_t t1 = get_mtime(file1); 4338 time_t t2 = get_mtime(file2); 4339 return t1 - t2; 4340 } 4341 4342 bool os::supports_map_sync() { 4343 return false; 4344 }