1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2018 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 "libo4.hpp" 41 #include "libperfstat_aix.hpp" 42 #include "libodm_aix.hpp" 43 #include "loadlib_aix.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "memory/filemap.hpp" 46 #include "misc_aix.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "os_aix.inline.hpp" 49 #include "os_share_aix.hpp" 50 #include "porting_aix.hpp" 51 #include "prims/jniFastGetField.hpp" 52 #include "prims/jvm_misc.hpp" 53 #include "runtime/arguments.hpp" 54 #include "runtime/atomic.hpp" 55 #include "runtime/extendedPC.hpp" 56 #include "runtime/globals.hpp" 57 #include "runtime/interfaceSupport.inline.hpp" 58 #include "runtime/java.hpp" 59 #include "runtime/javaCalls.hpp" 60 #include "runtime/mutexLocker.hpp" 61 #include "runtime/objectMonitor.hpp" 62 #include "runtime/orderAccess.hpp" 63 #include "runtime/os.hpp" 64 #include "runtime/osThread.hpp" 65 #include "runtime/perfMemory.hpp" 66 #include "runtime/sharedRuntime.hpp" 67 #include "runtime/statSampler.hpp" 68 #include "runtime/stubRoutines.hpp" 69 #include "runtime/thread.inline.hpp" 70 #include "runtime/threadCritical.hpp" 71 #include "runtime/timer.hpp" 72 #include "runtime/vm_version.hpp" 73 #include "services/attachListener.hpp" 74 #include "services/runtimeService.hpp" 75 #include "utilities/align.hpp" 76 #include "utilities/decoder.hpp" 77 #include "utilities/defaultStream.hpp" 78 #include "utilities/events.hpp" 79 #include "utilities/growableArray.hpp" 80 #include "utilities/vmError.hpp" 81 82 // put OS-includes here (sorted alphabetically) 83 #include <errno.h> 84 #include <fcntl.h> 85 #include <inttypes.h> 86 #include <poll.h> 87 #include <procinfo.h> 88 #include <pthread.h> 89 #include <pwd.h> 90 #include <semaphore.h> 91 #include <signal.h> 92 #include <stdint.h> 93 #include <stdio.h> 94 #include <string.h> 95 #include <unistd.h> 96 #include <sys/ioctl.h> 97 #include <sys/ipc.h> 98 #include <sys/mman.h> 99 #include <sys/resource.h> 100 #include <sys/select.h> 101 #include <sys/shm.h> 102 #include <sys/socket.h> 103 #include <sys/stat.h> 104 #include <sys/sysinfo.h> 105 #include <sys/systemcfg.h> 106 #include <sys/time.h> 107 #include <sys/times.h> 108 #include <sys/types.h> 109 #include <sys/utsname.h> 110 #include <sys/vminfo.h> 111 #include <sys/wait.h> 112 113 // Missing prototypes for various system APIs. 114 extern "C" 115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t); 116 117 #if !defined(_AIXVERSION_610) 118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int); 119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int); 120 extern "C" int getargs(procsinfo*, int, char*, int); 121 #endif 122 123 #define MAX_PATH (2 * K) 124 125 // for timer info max values which include all bits 126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 127 // for multipage initialization error analysis (in 'g_multipage_error') 128 #define ERROR_MP_OS_TOO_OLD 100 129 #define ERROR_MP_EXTSHM_ACTIVE 101 130 #define ERROR_MP_VMGETINFO_FAILED 102 131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103 132 133 // excerpts from systemcfg.h that might be missing on older os levels 134 #ifndef PV_5_Compat 135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */ 136 #endif 137 #ifndef PV_6 138 #define PV_6 0x100000 /* Power PC 6 */ 139 #endif 140 #ifndef PV_6_1 141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */ 142 #endif 143 #ifndef PV_6_Compat 144 #define PV_6_Compat 0x108000 /* Power PC 6 */ 145 #endif 146 #ifndef PV_7 147 #define PV_7 0x200000 /* Power PC 7 */ 148 #endif 149 #ifndef PV_7_Compat 150 #define PV_7_Compat 0x208000 /* Power PC 7 */ 151 #endif 152 #ifndef PV_8 153 #define PV_8 0x300000 /* Power PC 8 */ 154 #endif 155 #ifndef PV_8_Compat 156 #define PV_8_Compat 0x308000 /* Power PC 8 */ 157 #endif 158 159 static address resolve_function_descriptor_to_code_pointer(address p); 160 161 static void vmembk_print_on(outputStream* os); 162 163 //////////////////////////////////////////////////////////////////////////////// 164 // global variables (for a description see os_aix.hpp) 165 166 julong os::Aix::_physical_memory = 0; 167 168 pthread_t os::Aix::_main_thread = ((pthread_t)0); 169 int os::Aix::_page_size = -1; 170 171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase 172 int os::Aix::_on_pase = -1; 173 174 // 0 = uninitialized, otherwise 32 bit number: 175 // 0xVVRRTTSS 176 // VV - major version 177 // RR - minor version 178 // TT - tech level, if known, 0 otherwise 179 // SS - service pack, if known, 0 otherwise 180 uint32_t os::Aix::_os_version = 0; 181 182 // -1 = uninitialized, 0 - no, 1 - yes 183 int os::Aix::_xpg_sus_mode = -1; 184 185 // -1 = uninitialized, 0 - no, 1 - yes 186 int os::Aix::_extshm = -1; 187 188 //////////////////////////////////////////////////////////////////////////////// 189 // local variables 190 191 static volatile jlong max_real_time = 0; 192 static jlong initial_time_count = 0; 193 static int clock_tics_per_sec = 100; 194 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks) 195 static bool check_signals = true; 196 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769) 197 static sigset_t SR_sigset; 198 199 // Process break recorded at startup. 200 static address g_brk_at_startup = NULL; 201 202 // This describes the state of multipage support of the underlying 203 // OS. Note that this is of no interest to the outsize world and 204 // therefore should not be defined in AIX class. 205 // 206 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The 207 // latter two (16M "large" resp. 16G "huge" pages) require special 208 // setup and are normally not available. 209 // 210 // AIX supports multiple page sizes per process, for: 211 // - Stack (of the primordial thread, so not relevant for us) 212 // - Data - data, bss, heap, for us also pthread stacks 213 // - Text - text code 214 // - shared memory 215 // 216 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...) 217 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...). 218 // 219 // For shared memory, page size can be set dynamically via 220 // shmctl(). Different shared memory regions can have different page 221 // sizes. 222 // 223 // More information can be found at AIBM info center: 224 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm 225 // 226 static struct { 227 size_t pagesize; // sysconf _SC_PAGESIZE (4K) 228 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE) 229 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE) 230 size_t pthr_stack_pagesize; // stack page size of pthread threads 231 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE) 232 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm. 233 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm. 234 int error; // Error describing if something went wrong at multipage init. 235 } g_multipage_support = { 236 (size_t) -1, 237 (size_t) -1, 238 (size_t) -1, 239 (size_t) -1, 240 (size_t) -1, 241 false, false, 242 0 243 }; 244 245 // We must not accidentally allocate memory close to the BRK - even if 246 // that would work - because then we prevent the BRK segment from 247 // growing which may result in a malloc OOM even though there is 248 // enough memory. The problem only arises if we shmat() or mmap() at 249 // a specific wish address, e.g. to place the heap in a 250 // compressed-oops-friendly way. 251 static bool is_close_to_brk(address a) { 252 assert0(g_brk_at_startup != NULL); 253 if (a >= g_brk_at_startup && 254 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) { 255 return true; 256 } 257 return false; 258 } 259 260 julong os::available_memory() { 261 return Aix::available_memory(); 262 } 263 264 julong os::Aix::available_memory() { 265 // Avoid expensive API call here, as returned value will always be null. 266 if (os::Aix::on_pase()) { 267 return 0x0LL; 268 } 269 os::Aix::meminfo_t mi; 270 if (os::Aix::get_meminfo(&mi)) { 271 return mi.real_free; 272 } else { 273 return ULONG_MAX; 274 } 275 } 276 277 julong os::physical_memory() { 278 return Aix::physical_memory(); 279 } 280 281 // Return true if user is running as root. 282 283 bool os::have_special_privileges() { 284 static bool init = false; 285 static bool privileges = false; 286 if (!init) { 287 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 288 init = true; 289 } 290 return privileges; 291 } 292 293 // Helper function, emulates disclaim64 using multiple 32bit disclaims 294 // because we cannot use disclaim64() on AS/400 and old AIX releases. 295 static bool my_disclaim64(char* addr, size_t size) { 296 297 if (size == 0) { 298 return true; 299 } 300 301 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.) 302 const unsigned int maxDisclaimSize = 0x40000000; 303 304 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize); 305 const unsigned int lastDisclaimSize = (size % maxDisclaimSize); 306 307 char* p = addr; 308 309 for (int i = 0; i < numFullDisclaimsNeeded; i ++) { 310 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 311 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno); 312 return false; 313 } 314 p += maxDisclaimSize; 315 } 316 317 if (lastDisclaimSize > 0) { 318 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) { 319 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno); 320 return false; 321 } 322 } 323 324 return true; 325 } 326 327 // Cpu architecture string 328 #if defined(PPC32) 329 static char cpu_arch[] = "ppc"; 330 #elif defined(PPC64) 331 static char cpu_arch[] = "ppc64"; 332 #else 333 #error Add appropriate cpu_arch setting 334 #endif 335 336 // Wrap the function "vmgetinfo" which is not available on older OS releases. 337 static int checked_vmgetinfo(void *out, int command, int arg) { 338 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 339 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1"); 340 } 341 return ::vmgetinfo(out, command, arg); 342 } 343 344 // Given an address, returns the size of the page backing that address. 345 size_t os::Aix::query_pagesize(void* addr) { 346 347 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) { 348 // AS/400 older than V6R1: no vmgetinfo here, default to 4K 349 return 4*K; 350 } 351 352 vm_page_info pi; 353 pi.addr = (uint64_t)addr; 354 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) { 355 return pi.pagesize; 356 } else { 357 assert(false, "vmgetinfo failed to retrieve page size"); 358 return 4*K; 359 } 360 } 361 362 void os::Aix::initialize_system_info() { 363 364 // Get the number of online(logical) cpus instead of configured. 365 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN); 366 assert(_processor_count > 0, "_processor_count must be > 0"); 367 368 // Retrieve total physical storage. 369 os::Aix::meminfo_t mi; 370 if (!os::Aix::get_meminfo(&mi)) { 371 assert(false, "os::Aix::get_meminfo failed."); 372 } 373 _physical_memory = (julong) mi.real_total; 374 } 375 376 // Helper function for tracing page sizes. 377 static const char* describe_pagesize(size_t pagesize) { 378 switch (pagesize) { 379 case 4*K : return "4K"; 380 case 64*K: return "64K"; 381 case 16*M: return "16M"; 382 case 16*G: return "16G"; 383 default: 384 assert(false, "surprise"); 385 return "??"; 386 } 387 } 388 389 // Probe OS for multipage support. 390 // Will fill the global g_multipage_support structure. 391 // Must be called before calling os::large_page_init(). 392 static void query_multipage_support() { 393 394 guarantee(g_multipage_support.pagesize == -1, 395 "do not call twice"); 396 397 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE); 398 399 // This really would surprise me. 400 assert(g_multipage_support.pagesize == 4*K, "surprise!"); 401 402 // Query default data page size (default page size for C-Heap, pthread stacks and .bss). 403 // Default data page size is defined either by linker options (-bdatapsize) 404 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given, 405 // default should be 4K. 406 { 407 void* p = ::malloc(16*M); 408 g_multipage_support.datapsize = os::Aix::query_pagesize(p); 409 ::free(p); 410 } 411 412 // Query default shm page size (LDR_CNTRL SHMPSIZE). 413 // Note that this is pure curiosity. We do not rely on default page size but set 414 // our own page size after allocated. 415 { 416 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR); 417 guarantee(shmid != -1, "shmget failed"); 418 void* p = ::shmat(shmid, NULL, 0); 419 ::shmctl(shmid, IPC_RMID, NULL); 420 guarantee(p != (void*) -1, "shmat failed"); 421 g_multipage_support.shmpsize = os::Aix::query_pagesize(p); 422 ::shmdt(p); 423 } 424 425 // Before querying the stack page size, make sure we are not running as primordial 426 // thread (because primordial thread's stack may have different page size than 427 // pthread thread stacks). Running a VM on the primordial thread won't work for a 428 // number of reasons so we may just as well guarantee it here. 429 guarantee0(!os::is_primordial_thread()); 430 431 // Query pthread stack page size. Should be the same as data page size because 432 // pthread stacks are allocated from C-Heap. 433 { 434 int dummy = 0; 435 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy); 436 } 437 438 // Query default text page size (LDR_CNTRL TEXTPSIZE). 439 { 440 address any_function = 441 resolve_function_descriptor_to_code_pointer((address)describe_pagesize); 442 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function); 443 } 444 445 // Now probe for support of 64K pages and 16M pages. 446 447 // Before OS/400 V6R1, there is no support for pages other than 4K. 448 if (os::Aix::on_pase_V5R4_or_older()) { 449 trcVerbose("OS/400 < V6R1 - no large page support."); 450 g_multipage_support.error = ERROR_MP_OS_TOO_OLD; 451 goto query_multipage_support_end; 452 } 453 454 // Now check which page sizes the OS claims it supports, and of those, which actually can be used. 455 { 456 const int MAX_PAGE_SIZES = 4; 457 psize_t sizes[MAX_PAGE_SIZES]; 458 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES); 459 if (num_psizes == -1) { 460 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno); 461 trcVerbose("disabling multipage support."); 462 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED; 463 goto query_multipage_support_end; 464 } 465 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed."); 466 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?"); 467 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes); 468 for (int i = 0; i < num_psizes; i ++) { 469 trcVerbose(" %s ", describe_pagesize(sizes[i])); 470 } 471 472 // Can we use 64K, 16M pages? 473 for (int i = 0; i < num_psizes; i ++) { 474 const size_t pagesize = sizes[i]; 475 if (pagesize != 64*K && pagesize != 16*M) { 476 continue; 477 } 478 bool can_use = false; 479 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize)); 480 const int shmid = ::shmget(IPC_PRIVATE, pagesize, 481 IPC_CREAT | S_IRUSR | S_IWUSR); 482 guarantee0(shmid != -1); // Should always work. 483 // Try to set pagesize. 484 struct shmid_ds shm_buf = { 0 }; 485 shm_buf.shm_pagesize = pagesize; 486 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) { 487 const int en = errno; 488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible! 489 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n", 490 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 (0x%llX) 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 meory: %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 #define DEFAULT_LIBPATH "/lib:/usr/lib" 545 #define EXTENSIONS_DIR "/lib/ext" 546 547 // Buffer that fits several sprintfs. 548 // Note that the space for the trailing null is provided 549 // by the nulls included by the sizeof operator. 550 const size_t bufsize = 551 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends. 552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir 553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 554 555 // sysclasspath, java_home, dll_dir 556 { 557 char *pslash; 558 os::jvm_path(buf, bufsize); 559 560 // Found the full path to libjvm.so. 561 // Now cut the path to <java_home>/jre if we can. 562 pslash = strrchr(buf, '/'); 563 if (pslash != NULL) { 564 *pslash = '\0'; // Get rid of /libjvm.so. 565 } 566 pslash = strrchr(buf, '/'); 567 if (pslash != NULL) { 568 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 569 } 570 Arguments::set_dll_dir(buf); 571 572 if (pslash != NULL) { 573 pslash = strrchr(buf, '/'); 574 if (pslash != NULL) { 575 *pslash = '\0'; // Get rid of /lib. 576 } 577 } 578 Arguments::set_java_home(buf); 579 set_boot_path('/', ':'); 580 } 581 582 // Where to look for native libraries. 583 584 // On Aix we get the user setting of LIBPATH. 585 // Eventually, all the library path setting will be done here. 586 // Get the user setting of LIBPATH. 587 const char *v = ::getenv("LIBPATH"); 588 const char *v_colon = ":"; 589 if (v == NULL) { v = ""; v_colon = ""; } 590 591 // Concatenate user and invariant part of ld_library_path. 592 // That's +1 for the colon and +1 for the trailing '\0'. 593 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal); 594 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon); 595 Arguments::set_library_path(ld_library_path); 596 FREE_C_HEAP_ARRAY(char, ld_library_path); 597 598 // Extensions directories. 599 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home()); 600 Arguments::set_ext_dirs(buf); 601 602 FREE_C_HEAP_ARRAY(char, buf); 603 604 #undef DEFAULT_LIBPATH 605 #undef EXTENSIONS_DIR 606 } 607 608 //////////////////////////////////////////////////////////////////////////////// 609 // breakpoint support 610 611 void os::breakpoint() { 612 BREAKPOINT; 613 } 614 615 extern "C" void breakpoint() { 616 // use debugger to set breakpoint here 617 } 618 619 //////////////////////////////////////////////////////////////////////////////// 620 // signal support 621 622 debug_only(static bool signal_sets_initialized = false); 623 static sigset_t unblocked_sigs, vm_sigs; 624 625 void os::Aix::signal_sets_init() { 626 // Should also have an assertion stating we are still single-threaded. 627 assert(!signal_sets_initialized, "Already initialized"); 628 // Fill in signals that are necessarily unblocked for all threads in 629 // the VM. Currently, we unblock the following signals: 630 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 631 // by -Xrs (=ReduceSignalUsage)); 632 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 633 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 634 // the dispositions or masks wrt these signals. 635 // Programs embedding the VM that want to use the above signals for their 636 // own purposes must, at this time, use the "-Xrs" option to prevent 637 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 638 // (See bug 4345157, and other related bugs). 639 // In reality, though, unblocking these signals is really a nop, since 640 // these signals are not blocked by default. 641 sigemptyset(&unblocked_sigs); 642 sigaddset(&unblocked_sigs, SIGILL); 643 sigaddset(&unblocked_sigs, SIGSEGV); 644 sigaddset(&unblocked_sigs, SIGBUS); 645 sigaddset(&unblocked_sigs, SIGFPE); 646 sigaddset(&unblocked_sigs, SIGTRAP); 647 sigaddset(&unblocked_sigs, SR_signum); 648 649 if (!ReduceSignalUsage) { 650 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 651 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 652 } 653 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 654 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 655 } 656 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 657 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 658 } 659 } 660 // Fill in signals that are blocked by all but the VM thread. 661 sigemptyset(&vm_sigs); 662 if (!ReduceSignalUsage) 663 sigaddset(&vm_sigs, BREAK_SIGNAL); 664 debug_only(signal_sets_initialized = true); 665 } 666 667 // These are signals that are unblocked while a thread is running Java. 668 // (For some reason, they get blocked by default.) 669 sigset_t* os::Aix::unblocked_signals() { 670 assert(signal_sets_initialized, "Not initialized"); 671 return &unblocked_sigs; 672 } 673 674 // These are the signals that are blocked while a (non-VM) thread is 675 // running Java. Only the VM thread handles these signals. 676 sigset_t* os::Aix::vm_signals() { 677 assert(signal_sets_initialized, "Not initialized"); 678 return &vm_sigs; 679 } 680 681 void os::Aix::hotspot_sigmask(Thread* thread) { 682 683 //Save caller's signal mask before setting VM signal mask 684 sigset_t caller_sigmask; 685 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 686 687 OSThread* osthread = thread->osthread(); 688 osthread->set_caller_sigmask(caller_sigmask); 689 690 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); 691 692 if (!ReduceSignalUsage) { 693 if (thread->is_VM_thread()) { 694 // Only the VM thread handles BREAK_SIGNAL ... 695 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 696 } else { 697 // ... all other threads block BREAK_SIGNAL 698 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 699 } 700 } 701 } 702 703 // retrieve memory information. 704 // Returns false if something went wrong; 705 // content of pmi undefined in this case. 706 bool os::Aix::get_meminfo(meminfo_t* pmi) { 707 708 assert(pmi, "get_meminfo: invalid parameter"); 709 710 memset(pmi, 0, sizeof(meminfo_t)); 711 712 if (os::Aix::on_pase()) { 713 // On PASE, use the libo4 porting library. 714 715 unsigned long long virt_total = 0; 716 unsigned long long real_total = 0; 717 unsigned long long real_free = 0; 718 unsigned long long pgsp_total = 0; 719 unsigned long long pgsp_free = 0; 720 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) { 721 pmi->virt_total = virt_total; 722 pmi->real_total = real_total; 723 pmi->real_free = real_free; 724 pmi->pgsp_total = pgsp_total; 725 pmi->pgsp_free = pgsp_free; 726 return true; 727 } 728 return false; 729 730 } else { 731 732 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics 733 // See: 734 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 735 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm 736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 737 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 738 739 perfstat_memory_total_t psmt; 740 memset (&psmt, '\0', sizeof(psmt)); 741 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); 742 if (rc == -1) { 743 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno); 744 assert(0, "perfstat_memory_total() failed"); 745 return false; 746 } 747 748 assert(rc == 1, "perfstat_memory_total() - weird return code"); 749 750 // excerpt from 751 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 752 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 753 // The fields of perfstat_memory_total_t: 754 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). 755 // u_longlong_t real_total Total real memory (in 4 KB pages). 756 // u_longlong_t real_free Free real memory (in 4 KB pages). 757 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). 758 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). 759 760 pmi->virt_total = psmt.virt_total * 4096; 761 pmi->real_total = psmt.real_total * 4096; 762 pmi->real_free = psmt.real_free * 4096; 763 pmi->pgsp_total = psmt.pgsp_total * 4096; 764 pmi->pgsp_free = psmt.pgsp_free * 4096; 765 766 return true; 767 768 } 769 } // end os::Aix::get_meminfo 770 771 ////////////////////////////////////////////////////////////////////////////// 772 // create new thread 773 774 // Thread start routine for all newly created threads 775 static void *thread_native_entry(Thread *thread) { 776 777 // find out my own stack dimensions 778 { 779 // actually, this should do exactly the same as thread->record_stack_base_and_size... 780 thread->set_stack_base(os::current_stack_base()); 781 thread->set_stack_size(os::current_stack_size()); 782 } 783 784 const pthread_t pthread_id = ::pthread_self(); 785 const tid_t kernel_thread_id = ::thread_self(); 786 787 LogTarget(Info, os, thread) lt; 788 if (lt.is_enabled()) { 789 address low_address = thread->stack_end(); 790 address high_address = thread->stack_base(); 791 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT 792 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).", 793 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address, 794 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); 795 } 796 797 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() 798 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party 799 // tools hook pthread_create(). In this case, we may run into problems establishing 800 // guard pages on those stacks, because the stacks may reside in memory which is not 801 // protectable (shmated). 802 if (thread->stack_base() > ::sbrk(0)) { 803 log_warning(os, thread)("Thread stack not in data segment."); 804 } 805 806 // Try to randomize the cache line index of hot stack frames. 807 // This helps when threads of the same stack traces evict each other's 808 // cache lines. The threads can be either from the same JVM instance, or 809 // from different JVM instances. The benefit is especially true for 810 // processors with hyperthreading technology. 811 812 static int counter = 0; 813 int pid = os::current_process_id(); 814 alloca(((pid ^ counter++) & 7) * 128); 815 816 thread->initialize_thread_current(); 817 818 OSThread* osthread = thread->osthread(); 819 820 // Thread_id is pthread id. 821 osthread->set_thread_id(pthread_id); 822 823 // .. but keep kernel thread id too for diagnostics 824 osthread->set_kernel_thread_id(kernel_thread_id); 825 826 // Initialize signal mask for this thread. 827 os::Aix::hotspot_sigmask(thread); 828 829 // Initialize floating point control register. 830 os::Aix::init_thread_fpu_state(); 831 832 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); 833 834 // Call one more level start routine. 835 thread->run(); 836 837 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 838 os::current_thread_id(), (uintx) kernel_thread_id); 839 840 // If a thread has not deleted itself ("delete this") as part of its 841 // termination sequence, we have to ensure thread-local-storage is 842 // cleared before we actually terminate. No threads should ever be 843 // deleted asynchronously with respect to their termination. 844 if (Thread::current_or_null_safe() != NULL) { 845 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 846 thread->clear_thread_current(); 847 } 848 849 return 0; 850 } 851 852 bool os::create_thread(Thread* thread, ThreadType thr_type, 853 size_t req_stack_size) { 854 855 assert(thread->osthread() == NULL, "caller responsible"); 856 857 // Allocate the OSThread object. 858 OSThread* osthread = new OSThread(NULL, NULL); 859 if (osthread == NULL) { 860 return false; 861 } 862 863 // Set the correct thread state. 864 osthread->set_thread_type(thr_type); 865 866 // Initial state is ALLOCATED but not INITIALIZED 867 osthread->set_state(ALLOCATED); 868 869 thread->set_osthread(osthread); 870 871 // Init thread attributes. 872 pthread_attr_t attr; 873 pthread_attr_init(&attr); 874 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); 875 876 // Make sure we run in 1:1 kernel-user-thread mode. 877 if (os::Aix::on_aix()) { 878 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); 879 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); 880 } 881 882 // Start in suspended state, and in os::thread_start, wake the thread up. 883 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); 884 885 // Calculate stack size if it's not specified by caller. 886 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 887 888 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) 889 // the real thread stack size may be smaller than the requested stack size, by as much as 64K. 890 // This very much looks like a pthread lib error. As a workaround, increase the stack size 891 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB) 892 if (stack_size < 4096 * K) { 893 stack_size += 64 * K; 894 } 895 896 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the 897 // thread size in attr unchanged. If this is the minimal stack size as set 898 // by pthread_attr_init this leads to crashes after thread creation. E.g. the 899 // guard pages might not fit on the tiny stack created. 900 int ret = pthread_attr_setstacksize(&attr, stack_size); 901 if (ret != 0) { 902 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k", 903 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "), 904 stack_size / K); 905 thread->set_osthread(NULL); 906 delete osthread; 907 return false; 908 } 909 910 // Save some cycles and a page by disabling OS guard pages where we have our own 911 // VM guard pages (in java threads). For other threads, keep system default guard 912 // pages in place. 913 if (thr_type == java_thread || thr_type == compiler_thread) { 914 ret = pthread_attr_setguardsize(&attr, 0); 915 } 916 917 pthread_t tid = 0; 918 if (ret == 0) { 919 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 920 } 921 922 if (ret == 0) { 923 char buf[64]; 924 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 925 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 926 } else { 927 char buf[64]; 928 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.", 929 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 930 } 931 932 pthread_attr_destroy(&attr); 933 934 if (ret != 0) { 935 // Need to clean up stuff we've allocated so far. 936 thread->set_osthread(NULL); 937 delete osthread; 938 return false; 939 } 940 941 // OSThread::thread_id is the pthread id. 942 osthread->set_thread_id(tid); 943 944 return true; 945 } 946 947 ///////////////////////////////////////////////////////////////////////////// 948 // attach existing thread 949 950 // bootstrap the main thread 951 bool os::create_main_thread(JavaThread* thread) { 952 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); 953 return create_attached_thread(thread); 954 } 955 956 bool os::create_attached_thread(JavaThread* thread) { 957 #ifdef ASSERT 958 thread->verify_not_published(); 959 #endif 960 961 // Allocate the OSThread object 962 OSThread* osthread = new OSThread(NULL, NULL); 963 964 if (osthread == NULL) { 965 return false; 966 } 967 968 const pthread_t pthread_id = ::pthread_self(); 969 const tid_t kernel_thread_id = ::thread_self(); 970 971 // OSThread::thread_id is the pthread id. 972 osthread->set_thread_id(pthread_id); 973 974 // .. but keep kernel thread id too for diagnostics 975 osthread->set_kernel_thread_id(kernel_thread_id); 976 977 // initialize floating point control register 978 os::Aix::init_thread_fpu_state(); 979 980 // Initial thread state is RUNNABLE 981 osthread->set_state(RUNNABLE); 982 983 thread->set_osthread(osthread); 984 985 if (UseNUMA) { 986 int lgrp_id = os::numa_get_group_id(); 987 if (lgrp_id != -1) { 988 thread->set_lgrp_id(lgrp_id); 989 } 990 } 991 992 // initialize signal mask for this thread 993 // and save the caller's signal mask 994 os::Aix::hotspot_sigmask(thread); 995 996 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 997 os::current_thread_id(), (uintx) kernel_thread_id); 998 999 return true; 1000 } 1001 1002 void os::pd_start_thread(Thread* thread) { 1003 int status = pthread_continue_np(thread->osthread()->pthread_id()); 1004 assert(status == 0, "thr_continue failed"); 1005 } 1006 1007 // Free OS resources related to the OSThread 1008 void os::free_thread(OSThread* osthread) { 1009 assert(osthread != NULL, "osthread not set"); 1010 1011 // We are told to free resources of the argument thread, 1012 // but we can only really operate on the current thread. 1013 assert(Thread::current()->osthread() == osthread, 1014 "os::free_thread but not current thread"); 1015 1016 // Restore caller's signal mask 1017 sigset_t sigmask = osthread->caller_sigmask(); 1018 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1019 1020 delete osthread; 1021 } 1022 1023 //////////////////////////////////////////////////////////////////////////////// 1024 // time support 1025 1026 // Time since start-up in seconds to a fine granularity. 1027 // Used by VMSelfDestructTimer and the MemProfiler. 1028 double os::elapsedTime() { 1029 return (double)(os::elapsed_counter()) * 0.000001; 1030 } 1031 1032 jlong os::elapsed_counter() { 1033 timeval time; 1034 int status = gettimeofday(&time, NULL); 1035 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1036 } 1037 1038 jlong os::elapsed_frequency() { 1039 return (1000 * 1000); 1040 } 1041 1042 bool os::supports_vtime() { return true; } 1043 bool os::enable_vtime() { return false; } 1044 bool os::vtime_enabled() { return false; } 1045 1046 double os::elapsedVTime() { 1047 struct rusage usage; 1048 int retval = getrusage(RUSAGE_THREAD, &usage); 1049 if (retval == 0) { 1050 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1051 } else { 1052 // better than nothing, but not much 1053 return elapsedTime(); 1054 } 1055 } 1056 1057 jlong os::javaTimeMillis() { 1058 timeval time; 1059 int status = gettimeofday(&time, NULL); 1060 assert(status != -1, "aix error at gettimeofday()"); 1061 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1062 } 1063 1064 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1065 timeval time; 1066 int status = gettimeofday(&time, NULL); 1067 assert(status != -1, "aix error at gettimeofday()"); 1068 seconds = jlong(time.tv_sec); 1069 nanos = jlong(time.tv_usec) * 1000; 1070 } 1071 1072 // We use mread_real_time here. 1073 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1074 // it has to be converted to real time. AIX documentations suggests to do 1075 // this unconditionally, so we do it. 1076 // 1077 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1078 // 1079 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1080 // conversion is necessary. However, mread_real_time will not return 1081 // monotonic results but merely matches read_real_time. So we need a tweak 1082 // to ensure monotonic results. 1083 // 1084 // For PASE no public documentation exists, just word by IBM 1085 jlong os::javaTimeNanos() { 1086 timebasestruct_t time; 1087 int rc = mread_real_time(&time, TIMEBASE_SZ); 1088 if (os::Aix::on_pase()) { 1089 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1090 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1091 jlong prev = max_real_time; 1092 if (now <= prev) { 1093 return prev; // same or retrograde time; 1094 } 1095 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev); 1096 assert(obsv >= prev, "invariant"); // Monotonicity 1097 // If the CAS succeeded then we're done and return "now". 1098 // If the CAS failed and the observed value "obsv" is >= now then 1099 // we should return "obsv". If the CAS failed and now > obsv > prv then 1100 // some other thread raced this thread and installed a new value, in which case 1101 // we could either (a) retry the entire operation, (b) retry trying to install now 1102 // or (c) just return obsv. We use (c). No loop is required although in some cases 1103 // we might discard a higher "now" value in deference to a slightly lower but freshly 1104 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1105 // to (a) or (b) -- and greatly reduces coherence traffic. 1106 // We might also condition (c) on the magnitude of the delta between obsv and now. 1107 // Avoiding excessive CAS operations to hot RW locations is critical. 1108 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1109 return (prev == obsv) ? now : obsv; 1110 } else { 1111 if (rc != RTC_POWER) { 1112 rc = time_base_to_time(&time, TIMEBASE_SZ); 1113 assert(rc != -1, "error calling time_base_to_time()"); 1114 } 1115 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1116 } 1117 } 1118 1119 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1120 info_ptr->max_value = ALL_64_BITS; 1121 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1122 info_ptr->may_skip_backward = false; 1123 info_ptr->may_skip_forward = false; 1124 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1125 } 1126 1127 // Return the real, user, and system times in seconds from an 1128 // arbitrary fixed point in the past. 1129 bool os::getTimesSecs(double* process_real_time, 1130 double* process_user_time, 1131 double* process_system_time) { 1132 struct tms ticks; 1133 clock_t real_ticks = times(&ticks); 1134 1135 if (real_ticks == (clock_t) (-1)) { 1136 return false; 1137 } else { 1138 double ticks_per_second = (double) clock_tics_per_sec; 1139 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1140 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1141 *process_real_time = ((double) real_ticks) / ticks_per_second; 1142 1143 return true; 1144 } 1145 } 1146 1147 char * os::local_time_string(char *buf, size_t buflen) { 1148 struct tm t; 1149 time_t long_time; 1150 time(&long_time); 1151 localtime_r(&long_time, &t); 1152 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1153 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1154 t.tm_hour, t.tm_min, t.tm_sec); 1155 return buf; 1156 } 1157 1158 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1159 return localtime_r(clock, res); 1160 } 1161 1162 //////////////////////////////////////////////////////////////////////////////// 1163 // runtime exit support 1164 1165 // Note: os::shutdown() might be called very early during initialization, or 1166 // called from signal handler. Before adding something to os::shutdown(), make 1167 // sure it is async-safe and can handle partially initialized VM. 1168 void os::shutdown() { 1169 1170 // allow PerfMemory to attempt cleanup of any persistent resources 1171 perfMemory_exit(); 1172 1173 // needs to remove object in file system 1174 AttachListener::abort(); 1175 1176 // flush buffered output, finish log files 1177 ostream_abort(); 1178 1179 // Check for abort hook 1180 abort_hook_t abort_hook = Arguments::abort_hook(); 1181 if (abort_hook != NULL) { 1182 abort_hook(); 1183 } 1184 } 1185 1186 // Note: os::abort() might be called very early during initialization, or 1187 // called from signal handler. Before adding something to os::abort(), make 1188 // sure it is async-safe and can handle partially initialized VM. 1189 void os::abort(bool dump_core, void* siginfo, const void* context) { 1190 os::shutdown(); 1191 if (dump_core) { 1192 #ifndef PRODUCT 1193 fdStream out(defaultStream::output_fd()); 1194 out.print_raw("Current thread is "); 1195 char buf[16]; 1196 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1197 out.print_raw_cr(buf); 1198 out.print_raw_cr("Dumping core ..."); 1199 #endif 1200 ::abort(); // dump core 1201 } 1202 1203 ::exit(1); 1204 } 1205 1206 // Die immediately, no exit hook, no abort hook, no cleanup. 1207 void os::die() { 1208 ::abort(); 1209 } 1210 1211 intx os::current_thread_id() { 1212 return (intx)pthread_self(); 1213 } 1214 1215 int os::current_process_id() { 1216 return getpid(); 1217 } 1218 1219 // DLL functions 1220 1221 const char* os::dll_file_extension() { return ".so"; } 1222 1223 // This must be hard coded because it's the system's temporary 1224 // directory not the java application's temp directory, ala java.io.tmpdir. 1225 const char* os::get_temp_directory() { return "/tmp"; } 1226 1227 // Check if addr is inside libjvm.so. 1228 bool os::address_is_in_vm(address addr) { 1229 1230 // Input could be a real pc or a function pointer literal. The latter 1231 // would be a function descriptor residing in the data segment of a module. 1232 loaded_module_t lm; 1233 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1234 return lm.is_in_vm; 1235 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1236 return lm.is_in_vm; 1237 } else { 1238 return false; 1239 } 1240 1241 } 1242 1243 // Resolve an AIX function descriptor literal to a code pointer. 1244 // If the input is a valid code pointer to a text segment of a loaded module, 1245 // it is returned unchanged. 1246 // If the input is a valid AIX function descriptor, it is resolved to the 1247 // code entry point. 1248 // If the input is neither a valid function descriptor nor a valid code pointer, 1249 // NULL is returned. 1250 static address resolve_function_descriptor_to_code_pointer(address p) { 1251 1252 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1253 // It is a real code pointer. 1254 return p; 1255 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1256 // Pointer to data segment, potential function descriptor. 1257 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1258 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1259 // It is a function descriptor. 1260 return code_entry; 1261 } 1262 } 1263 1264 return NULL; 1265 } 1266 1267 bool os::dll_address_to_function_name(address addr, char *buf, 1268 int buflen, int *offset, 1269 bool demangle) { 1270 if (offset) { 1271 *offset = -1; 1272 } 1273 // Buf is not optional, but offset is optional. 1274 assert(buf != NULL, "sanity check"); 1275 buf[0] = '\0'; 1276 1277 // Resolve function ptr literals first. 1278 addr = resolve_function_descriptor_to_code_pointer(addr); 1279 if (!addr) { 1280 return false; 1281 } 1282 1283 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1284 } 1285 1286 bool os::dll_address_to_library_name(address addr, char* buf, 1287 int buflen, int* offset) { 1288 if (offset) { 1289 *offset = -1; 1290 } 1291 // Buf is not optional, but offset is optional. 1292 assert(buf != NULL, "sanity check"); 1293 buf[0] = '\0'; 1294 1295 // Resolve function ptr literals first. 1296 addr = resolve_function_descriptor_to_code_pointer(addr); 1297 if (!addr) { 1298 return false; 1299 } 1300 1301 return AixSymbols::get_module_name(addr, buf, buflen); 1302 } 1303 1304 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1305 // for the same architecture as Hotspot is running on. 1306 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1307 1308 if (ebuf && ebuflen > 0) { 1309 ebuf[0] = '\0'; 1310 ebuf[ebuflen - 1] = '\0'; 1311 } 1312 1313 if (!filename || strlen(filename) == 0) { 1314 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1315 return NULL; 1316 } 1317 1318 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1319 void * result= ::dlopen(filename, RTLD_LAZY); 1320 if (result != NULL) { 1321 // Reload dll cache. Don't do this in signal handling. 1322 LoadedLibraries::reload(); 1323 return result; 1324 } else { 1325 // error analysis when dlopen fails 1326 const char* const error_report = ::dlerror(); 1327 if (error_report && ebuf && ebuflen > 0) { 1328 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1329 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1330 } 1331 } 1332 return NULL; 1333 } 1334 1335 void* os::dll_lookup(void* handle, const char* name) { 1336 void* res = dlsym(handle, name); 1337 return res; 1338 } 1339 1340 void* os::get_default_process_handle() { 1341 return (void*)::dlopen(NULL, RTLD_LAZY); 1342 } 1343 1344 void os::print_dll_info(outputStream *st) { 1345 st->print_cr("Dynamic libraries:"); 1346 LoadedLibraries::print(st); 1347 } 1348 1349 void os::get_summary_os_info(char* buf, size_t buflen) { 1350 // There might be something more readable than uname results for AIX. 1351 struct utsname name; 1352 uname(&name); 1353 snprintf(buf, buflen, "%s %s", name.release, name.version); 1354 } 1355 1356 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1357 // Not yet implemented. 1358 return 0; 1359 } 1360 1361 void os::print_os_info_brief(outputStream* st) { 1362 uint32_t ver = os::Aix::os_version(); 1363 st->print_cr("AIX kernel version %u.%u.%u.%u", 1364 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1365 1366 os::Posix::print_uname_info(st); 1367 1368 // Linux uses print_libversion_info(st); here. 1369 } 1370 1371 void os::print_os_info(outputStream* st) { 1372 st->print("OS:"); 1373 1374 st->print("uname:"); 1375 struct utsname name; 1376 uname(&name); 1377 st->print(name.sysname); st->print(" "); 1378 st->print(name.nodename); st->print(" "); 1379 st->print(name.release); st->print(" "); 1380 st->print(name.version); st->print(" "); 1381 st->print(name.machine); 1382 st->cr(); 1383 1384 uint32_t ver = os::Aix::os_version(); 1385 st->print_cr("AIX kernel version %u.%u.%u.%u", 1386 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1387 1388 os::Posix::print_rlimit_info(st); 1389 1390 // load average 1391 st->print("load average:"); 1392 double loadavg[3] = {-1.L, -1.L, -1.L}; 1393 os::loadavg(loadavg, 3); 1394 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 1395 st->cr(); 1396 1397 // print wpar info 1398 libperfstat::wparinfo_t wi; 1399 if (libperfstat::get_wparinfo(&wi)) { 1400 st->print_cr("wpar info"); 1401 st->print_cr("name: %s", wi.name); 1402 st->print_cr("id: %d", wi.wpar_id); 1403 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1404 } 1405 1406 // print partition info 1407 libperfstat::partitioninfo_t pi; 1408 if (libperfstat::get_partitioninfo(&pi)) { 1409 st->print_cr("partition info"); 1410 st->print_cr(" name: %s", pi.name); 1411 } 1412 1413 } 1414 1415 void os::print_memory_info(outputStream* st) { 1416 1417 st->print_cr("Memory:"); 1418 1419 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1420 describe_pagesize(g_multipage_support.pagesize)); 1421 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1422 describe_pagesize(g_multipage_support.datapsize)); 1423 st->print_cr(" Text page size: %s", 1424 describe_pagesize(g_multipage_support.textpsize)); 1425 st->print_cr(" Thread stack page size (pthread): %s", 1426 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1427 st->print_cr(" Default shared memory page size: %s", 1428 describe_pagesize(g_multipage_support.shmpsize)); 1429 st->print_cr(" Can use 64K pages dynamically with shared meory: %s", 1430 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1431 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1432 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1433 st->print_cr(" Multipage error: %d", 1434 g_multipage_support.error); 1435 st->cr(); 1436 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1437 1438 // print out LDR_CNTRL because it affects the default page sizes 1439 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1440 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1441 1442 // Print out EXTSHM because it is an unsupported setting. 1443 const char* const extshm = ::getenv("EXTSHM"); 1444 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1445 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1446 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1447 } 1448 1449 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1450 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1451 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1452 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1453 st->cr(); 1454 1455 os::Aix::meminfo_t mi; 1456 if (os::Aix::get_meminfo(&mi)) { 1457 if (os::Aix::on_aix()) { 1458 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1459 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1460 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1461 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1462 } else { 1463 // PASE - Numbers are result of QWCRSSTS; they mean: 1464 // real_total: Sum of all system pools 1465 // real_free: always 0 1466 // pgsp_total: we take the size of the system ASP 1467 // pgsp_free: size of system ASP times percentage of system ASP unused 1468 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1469 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1470 st->print_cr("%% system asp used : %.2f", 1471 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1472 } 1473 } 1474 st->cr(); 1475 1476 // Print program break. 1477 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1478 address brk_now = (address)::sbrk(0); 1479 if (brk_now != (address)-1) { 1480 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1481 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1482 } 1483 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1484 st->cr(); 1485 1486 // Print segments allocated with os::reserve_memory. 1487 st->print_cr("internal virtual memory regions used by vm:"); 1488 vmembk_print_on(st); 1489 } 1490 1491 // Get a string for the cpuinfo that is a summary of the cpu type 1492 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1493 // read _system_configuration.version 1494 switch (_system_configuration.version) { 1495 case PV_8: 1496 strncpy(buf, "Power PC 8", buflen); 1497 break; 1498 case PV_7: 1499 strncpy(buf, "Power PC 7", buflen); 1500 break; 1501 case PV_6_1: 1502 strncpy(buf, "Power PC 6 DD1.x", buflen); 1503 break; 1504 case PV_6: 1505 strncpy(buf, "Power PC 6", buflen); 1506 break; 1507 case PV_5: 1508 strncpy(buf, "Power PC 5", buflen); 1509 break; 1510 case PV_5_2: 1511 strncpy(buf, "Power PC 5_2", buflen); 1512 break; 1513 case PV_5_3: 1514 strncpy(buf, "Power PC 5_3", buflen); 1515 break; 1516 case PV_5_Compat: 1517 strncpy(buf, "PV_5_Compat", buflen); 1518 break; 1519 case PV_6_Compat: 1520 strncpy(buf, "PV_6_Compat", buflen); 1521 break; 1522 case PV_7_Compat: 1523 strncpy(buf, "PV_7_Compat", buflen); 1524 break; 1525 case PV_8_Compat: 1526 strncpy(buf, "PV_8_Compat", buflen); 1527 break; 1528 default: 1529 strncpy(buf, "unknown", buflen); 1530 } 1531 } 1532 1533 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1534 // Nothing to do beyond of what os::print_cpu_info() does. 1535 } 1536 1537 static void print_signal_handler(outputStream* st, int sig, 1538 char* buf, size_t buflen); 1539 1540 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1541 st->print_cr("Signal Handlers:"); 1542 print_signal_handler(st, SIGSEGV, buf, buflen); 1543 print_signal_handler(st, SIGBUS , buf, buflen); 1544 print_signal_handler(st, SIGFPE , buf, buflen); 1545 print_signal_handler(st, SIGPIPE, buf, buflen); 1546 print_signal_handler(st, SIGXFSZ, buf, buflen); 1547 print_signal_handler(st, SIGILL , buf, buflen); 1548 print_signal_handler(st, SR_signum, buf, buflen); 1549 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1550 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1551 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1552 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1553 print_signal_handler(st, SIGTRAP, buf, buflen); 1554 // We also want to know if someone else adds a SIGDANGER handler because 1555 // that will interfere with OOM killling. 1556 print_signal_handler(st, SIGDANGER, buf, buflen); 1557 } 1558 1559 static char saved_jvm_path[MAXPATHLEN] = {0}; 1560 1561 // Find the full path to the current module, libjvm.so. 1562 void os::jvm_path(char *buf, jint buflen) { 1563 // Error checking. 1564 if (buflen < MAXPATHLEN) { 1565 assert(false, "must use a large-enough buffer"); 1566 buf[0] = '\0'; 1567 return; 1568 } 1569 // Lazy resolve the path to current module. 1570 if (saved_jvm_path[0] != 0) { 1571 strcpy(buf, saved_jvm_path); 1572 return; 1573 } 1574 1575 Dl_info dlinfo; 1576 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1577 assert(ret != 0, "cannot locate libjvm"); 1578 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1579 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1580 1581 if (Arguments::sun_java_launcher_is_altjvm()) { 1582 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1583 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1584 // If "/jre/lib/" appears at the right place in the string, then 1585 // assume we are installed in a JDK and we're done. Otherwise, check 1586 // for a JAVA_HOME environment variable and fix up the path so it 1587 // looks like libjvm.so is installed there (append a fake suffix 1588 // hotspot/libjvm.so). 1589 const char *p = buf + strlen(buf) - 1; 1590 for (int count = 0; p > buf && count < 4; ++count) { 1591 for (--p; p > buf && *p != '/'; --p) 1592 /* empty */ ; 1593 } 1594 1595 if (strncmp(p, "/jre/lib/", 9) != 0) { 1596 // Look for JAVA_HOME in the environment. 1597 char* java_home_var = ::getenv("JAVA_HOME"); 1598 if (java_home_var != NULL && java_home_var[0] != 0) { 1599 char* jrelib_p; 1600 int len; 1601 1602 // Check the current module name "libjvm.so". 1603 p = strrchr(buf, '/'); 1604 if (p == NULL) { 1605 return; 1606 } 1607 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1608 1609 rp = os::Posix::realpath(java_home_var, buf, buflen); 1610 if (rp == NULL) { 1611 return; 1612 } 1613 1614 // determine if this is a legacy image or modules image 1615 // modules image doesn't have "jre" subdirectory 1616 len = strlen(buf); 1617 assert(len < buflen, "Ran out of buffer room"); 1618 jrelib_p = buf + len; 1619 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1620 if (0 != access(buf, F_OK)) { 1621 snprintf(jrelib_p, buflen-len, "/lib"); 1622 } 1623 1624 if (0 == access(buf, F_OK)) { 1625 // Use current module name "libjvm.so" 1626 len = strlen(buf); 1627 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1628 } else { 1629 // Go back to path of .so 1630 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1631 if (rp == NULL) { 1632 return; 1633 } 1634 } 1635 } 1636 } 1637 } 1638 1639 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1640 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1641 } 1642 1643 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1644 // no prefix required, not even "_" 1645 } 1646 1647 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1648 // no suffix required 1649 } 1650 1651 //////////////////////////////////////////////////////////////////////////////// 1652 // sun.misc.Signal support 1653 1654 static volatile jint sigint_count = 0; 1655 1656 static void 1657 UserHandler(int sig, void *siginfo, void *context) { 1658 // 4511530 - sem_post is serialized and handled by the manager thread. When 1659 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1660 // don't want to flood the manager thread with sem_post requests. 1661 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1662 return; 1663 1664 // Ctrl-C is pressed during error reporting, likely because the error 1665 // handler fails to abort. Let VM die immediately. 1666 if (sig == SIGINT && VMError::is_error_reported()) { 1667 os::die(); 1668 } 1669 1670 os::signal_notify(sig); 1671 } 1672 1673 void* os::user_handler() { 1674 return CAST_FROM_FN_PTR(void*, UserHandler); 1675 } 1676 1677 extern "C" { 1678 typedef void (*sa_handler_t)(int); 1679 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1680 } 1681 1682 void* os::signal(int signal_number, void* handler) { 1683 struct sigaction sigAct, oldSigAct; 1684 1685 sigfillset(&(sigAct.sa_mask)); 1686 1687 // Do not block out synchronous signals in the signal handler. 1688 // Blocking synchronous signals only makes sense if you can really 1689 // be sure that those signals won't happen during signal handling, 1690 // when the blocking applies. Normal signal handlers are lean and 1691 // do not cause signals. But our signal handlers tend to be "risky" 1692 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1693 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1694 // by a SIGILL, which was blocked due to the signal mask. The process 1695 // just hung forever. Better to crash from a secondary signal than to hang. 1696 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1697 sigdelset(&(sigAct.sa_mask), SIGBUS); 1698 sigdelset(&(sigAct.sa_mask), SIGILL); 1699 sigdelset(&(sigAct.sa_mask), SIGFPE); 1700 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1701 1702 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1703 1704 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1705 1706 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1707 // -1 means registration failed 1708 return (void *)-1; 1709 } 1710 1711 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1712 } 1713 1714 void os::signal_raise(int signal_number) { 1715 ::raise(signal_number); 1716 } 1717 1718 // 1719 // The following code is moved from os.cpp for making this 1720 // code platform specific, which it is by its very nature. 1721 // 1722 1723 // Will be modified when max signal is changed to be dynamic 1724 int os::sigexitnum_pd() { 1725 return NSIG; 1726 } 1727 1728 // a counter for each possible signal value 1729 static volatile jint pending_signals[NSIG+1] = { 0 }; 1730 1731 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1732 // On AIX, we use sem_init(), sem_post(), sem_wait() 1733 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1734 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1735 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1736 // on AIX, msem_..() calls are suspected of causing problems. 1737 static sem_t sig_sem; 1738 static msemaphore* p_sig_msem = 0; 1739 1740 static void local_sem_init() { 1741 if (os::Aix::on_aix()) { 1742 int rc = ::sem_init(&sig_sem, 0, 0); 1743 guarantee(rc != -1, "sem_init failed"); 1744 } else { 1745 // Memory semaphores must live in shared mem. 1746 guarantee0(p_sig_msem == NULL); 1747 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1748 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1749 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1750 } 1751 } 1752 1753 static void local_sem_post() { 1754 static bool warn_only_once = false; 1755 if (os::Aix::on_aix()) { 1756 int rc = ::sem_post(&sig_sem); 1757 if (rc == -1 && !warn_only_once) { 1758 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1759 warn_only_once = true; 1760 } 1761 } else { 1762 guarantee0(p_sig_msem != NULL); 1763 int rc = ::msem_unlock(p_sig_msem, 0); 1764 if (rc == -1 && !warn_only_once) { 1765 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1766 warn_only_once = true; 1767 } 1768 } 1769 } 1770 1771 static void local_sem_wait() { 1772 static bool warn_only_once = false; 1773 if (os::Aix::on_aix()) { 1774 int rc = ::sem_wait(&sig_sem); 1775 if (rc == -1 && !warn_only_once) { 1776 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1777 warn_only_once = true; 1778 } 1779 } else { 1780 guarantee0(p_sig_msem != NULL); // must init before use 1781 int rc = ::msem_lock(p_sig_msem, 0); 1782 if (rc == -1 && !warn_only_once) { 1783 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1784 warn_only_once = true; 1785 } 1786 } 1787 } 1788 1789 static void jdk_misc_signal_init() { 1790 // Initialize signal structures 1791 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1792 1793 // Initialize signal semaphore 1794 local_sem_init(); 1795 } 1796 1797 void os::signal_notify(int sig) { 1798 Atomic::inc(&pending_signals[sig]); 1799 local_sem_post(); 1800 } 1801 1802 static int check_pending_signals() { 1803 Atomic::store(0, &sigint_count); 1804 for (;;) { 1805 for (int i = 0; i < NSIG + 1; i++) { 1806 jint n = pending_signals[i]; 1807 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1808 return i; 1809 } 1810 } 1811 JavaThread *thread = JavaThread::current(); 1812 ThreadBlockInVM tbivm(thread); 1813 1814 bool threadIsSuspended; 1815 do { 1816 thread->set_suspend_equivalent(); 1817 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1818 1819 local_sem_wait(); 1820 1821 // were we externally suspended while we were waiting? 1822 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1823 if (threadIsSuspended) { 1824 // 1825 // The semaphore has been incremented, but while we were waiting 1826 // another thread suspended us. We don't want to continue running 1827 // while suspended because that would surprise the thread that 1828 // suspended us. 1829 // 1830 1831 local_sem_post(); 1832 1833 thread->java_suspend_self(); 1834 } 1835 } while (threadIsSuspended); 1836 } 1837 } 1838 1839 int os::signal_wait() { 1840 return check_pending_signals(); 1841 } 1842 1843 //////////////////////////////////////////////////////////////////////////////// 1844 // Virtual Memory 1845 1846 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1847 1848 #define VMEM_MAPPED 1 1849 #define VMEM_SHMATED 2 1850 1851 struct vmembk_t { 1852 int type; // 1 - mmap, 2 - shmat 1853 char* addr; 1854 size_t size; // Real size, may be larger than usersize. 1855 size_t pagesize; // page size of area 1856 vmembk_t* next; 1857 1858 bool contains_addr(char* p) const { 1859 return p >= addr && p < (addr + size); 1860 } 1861 1862 bool contains_range(char* p, size_t s) const { 1863 return contains_addr(p) && contains_addr(p + s - 1); 1864 } 1865 1866 void print_on(outputStream* os) const { 1867 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1868 " bytes, %d %s pages), %s", 1869 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1870 (type == VMEM_SHMATED ? "shmat" : "mmap") 1871 ); 1872 } 1873 1874 // Check that range is a sub range of memory block (or equal to memory block); 1875 // also check that range is fully page aligned to the page size if the block. 1876 void assert_is_valid_subrange(char* p, size_t s) const { 1877 if (!contains_range(p, s)) { 1878 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1879 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1880 p, p + s, addr, addr + size); 1881 guarantee0(false); 1882 } 1883 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1884 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1885 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize); 1886 guarantee0(false); 1887 } 1888 } 1889 }; 1890 1891 static struct { 1892 vmembk_t* first; 1893 MiscUtils::CritSect cs; 1894 } vmem; 1895 1896 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1897 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1898 assert0(p); 1899 if (p) { 1900 MiscUtils::AutoCritSect lck(&vmem.cs); 1901 p->addr = addr; p->size = size; 1902 p->pagesize = pagesize; 1903 p->type = type; 1904 p->next = vmem.first; 1905 vmem.first = p; 1906 } 1907 } 1908 1909 static vmembk_t* vmembk_find(char* addr) { 1910 MiscUtils::AutoCritSect lck(&vmem.cs); 1911 for (vmembk_t* p = vmem.first; p; p = p->next) { 1912 if (p->addr <= addr && (p->addr + p->size) > addr) { 1913 return p; 1914 } 1915 } 1916 return NULL; 1917 } 1918 1919 static void vmembk_remove(vmembk_t* p0) { 1920 MiscUtils::AutoCritSect lck(&vmem.cs); 1921 assert0(p0); 1922 assert0(vmem.first); // List should not be empty. 1923 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1924 if (*pp == p0) { 1925 *pp = p0->next; 1926 ::free(p0); 1927 return; 1928 } 1929 } 1930 assert0(false); // Not found? 1931 } 1932 1933 static void vmembk_print_on(outputStream* os) { 1934 MiscUtils::AutoCritSect lck(&vmem.cs); 1935 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1936 vmi->print_on(os); 1937 os->cr(); 1938 } 1939 } 1940 1941 // Reserve and attach a section of System V memory. 1942 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1943 // address. Failing that, it will attach the memory anywhere. 1944 // If <requested_addr> is NULL, function will attach the memory anywhere. 1945 // 1946 // <alignment_hint> is being ignored by this function. It is very probable however that the 1947 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1948 // Should this be not enogh, we can put more work into it. 1949 static char* reserve_shmated_memory ( 1950 size_t bytes, 1951 char* requested_addr, 1952 size_t alignment_hint) { 1953 1954 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1955 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1956 bytes, requested_addr, alignment_hint); 1957 1958 // Either give me wish address or wish alignment but not both. 1959 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1960 1961 // We must prevent anyone from attaching too close to the 1962 // BRK because that may cause malloc OOM. 1963 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1964 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1965 "Will attach anywhere.", requested_addr); 1966 // Act like the OS refused to attach there. 1967 requested_addr = NULL; 1968 } 1969 1970 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1971 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1972 if (os::Aix::on_pase_V5R4_or_older()) { 1973 ShouldNotReachHere(); 1974 } 1975 1976 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 1977 const size_t size = align_up(bytes, 64*K); 1978 1979 // Reserve the shared segment. 1980 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 1981 if (shmid == -1) { 1982 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 1983 return NULL; 1984 } 1985 1986 // Important note: 1987 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 1988 // We must right after attaching it remove it from the system. System V shm segments are global and 1989 // survive the process. 1990 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 1991 1992 struct shmid_ds shmbuf; 1993 memset(&shmbuf, 0, sizeof(shmbuf)); 1994 shmbuf.shm_pagesize = 64*K; 1995 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 1996 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 1997 size / (64*K), errno); 1998 // I want to know if this ever happens. 1999 assert(false, "failed to set page size for shmat"); 2000 } 2001 2002 // Now attach the shared segment. 2003 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 2004 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 2005 // were not a segment boundary. 2006 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 2007 const int errno_shmat = errno; 2008 2009 // (A) Right after shmat and before handing shmat errors delete the shm segment. 2010 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 2011 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 2012 assert(false, "failed to remove shared memory segment!"); 2013 } 2014 2015 // Handle shmat error. If we failed to attach, just return. 2016 if (addr == (char*)-1) { 2017 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat); 2018 return NULL; 2019 } 2020 2021 // Just for info: query the real page size. In case setting the page size did not 2022 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2023 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2024 if (real_pagesize != shmbuf.shm_pagesize) { 2025 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize); 2026 } 2027 2028 if (addr) { 2029 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2030 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize)); 2031 } else { 2032 if (requested_addr != NULL) { 2033 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr); 2034 } else { 2035 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2036 } 2037 } 2038 2039 // book-keeping 2040 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2041 assert0(is_aligned_to(addr, os::vm_page_size())); 2042 2043 return addr; 2044 } 2045 2046 static bool release_shmated_memory(char* addr, size_t size) { 2047 2048 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2049 addr, addr + size - 1); 2050 2051 bool rc = false; 2052 2053 // TODO: is there a way to verify shm size without doing bookkeeping? 2054 if (::shmdt(addr) != 0) { 2055 trcVerbose("error (%d).", errno); 2056 } else { 2057 trcVerbose("ok."); 2058 rc = true; 2059 } 2060 return rc; 2061 } 2062 2063 static bool uncommit_shmated_memory(char* addr, size_t size) { 2064 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2065 addr, addr + size - 1); 2066 2067 const bool rc = my_disclaim64(addr, size); 2068 2069 if (!rc) { 2070 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size); 2071 return false; 2072 } 2073 return true; 2074 } 2075 2076 //////////////////////////////// mmap-based routines ///////////////////////////////// 2077 2078 // Reserve memory via mmap. 2079 // If <requested_addr> is given, an attempt is made to attach at the given address. 2080 // Failing that, memory is allocated at any address. 2081 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2082 // allocate at an address aligned with the given alignment. Failing that, memory 2083 // is aligned anywhere. 2084 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2085 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2086 "alignment_hint " UINTX_FORMAT "...", 2087 bytes, requested_addr, alignment_hint); 2088 2089 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2090 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2091 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr); 2092 return NULL; 2093 } 2094 2095 // We must prevent anyone from attaching too close to the 2096 // BRK because that may cause malloc OOM. 2097 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2098 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2099 "Will attach anywhere.", requested_addr); 2100 // Act like the OS refused to attach there. 2101 requested_addr = NULL; 2102 } 2103 2104 // Specify one or the other but not both. 2105 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2106 2107 // In 64K mode, we claim the global page size (os::vm_page_size()) 2108 // is 64K. This is one of the few points where that illusion may 2109 // break, because mmap() will always return memory aligned to 4K. So 2110 // we must ensure we only ever return memory aligned to 64k. 2111 if (alignment_hint) { 2112 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2113 } else { 2114 alignment_hint = os::vm_page_size(); 2115 } 2116 2117 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2118 const size_t size = align_up(bytes, os::vm_page_size()); 2119 2120 // alignment: Allocate memory large enough to include an aligned range of the right size and 2121 // cut off the leading and trailing waste pages. 2122 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2123 const size_t extra_size = size + alignment_hint; 2124 2125 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2126 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2127 int flags = MAP_ANONYMOUS | MAP_SHARED; 2128 2129 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2130 // it means if wishaddress is given but MAP_FIXED is not set. 2131 // 2132 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2133 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2134 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2135 // get clobbered. 2136 if (requested_addr != NULL) { 2137 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2138 flags |= MAP_FIXED; 2139 } 2140 } 2141 2142 char* addr = (char*)::mmap(requested_addr, extra_size, 2143 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2144 2145 if (addr == MAP_FAILED) { 2146 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno); 2147 return NULL; 2148 } 2149 2150 // Handle alignment. 2151 char* const addr_aligned = align_up(addr, alignment_hint); 2152 const size_t waste_pre = addr_aligned - addr; 2153 char* const addr_aligned_end = addr_aligned + size; 2154 const size_t waste_post = extra_size - waste_pre - size; 2155 if (waste_pre > 0) { 2156 ::munmap(addr, waste_pre); 2157 } 2158 if (waste_post > 0) { 2159 ::munmap(addr_aligned_end, waste_post); 2160 } 2161 addr = addr_aligned; 2162 2163 if (addr) { 2164 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2165 addr, addr + bytes, bytes); 2166 } else { 2167 if (requested_addr != NULL) { 2168 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr); 2169 } else { 2170 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2171 } 2172 } 2173 2174 // bookkeeping 2175 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2176 2177 // Test alignment, see above. 2178 assert0(is_aligned_to(addr, os::vm_page_size())); 2179 2180 return addr; 2181 } 2182 2183 static bool release_mmaped_memory(char* addr, size_t size) { 2184 assert0(is_aligned_to(addr, os::vm_page_size())); 2185 assert0(is_aligned_to(size, os::vm_page_size())); 2186 2187 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2188 addr, addr + size - 1); 2189 bool rc = false; 2190 2191 if (::munmap(addr, size) != 0) { 2192 trcVerbose("failed (%d)\n", errno); 2193 rc = false; 2194 } else { 2195 trcVerbose("ok."); 2196 rc = true; 2197 } 2198 2199 return rc; 2200 } 2201 2202 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2203 2204 assert0(is_aligned_to(addr, os::vm_page_size())); 2205 assert0(is_aligned_to(size, os::vm_page_size())); 2206 2207 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2208 addr, addr + size - 1); 2209 bool rc = false; 2210 2211 // Uncommit mmap memory with msync MS_INVALIDATE. 2212 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2213 trcVerbose("failed (%d)\n", errno); 2214 rc = false; 2215 } else { 2216 trcVerbose("ok."); 2217 rc = true; 2218 } 2219 2220 return rc; 2221 } 2222 2223 int os::vm_page_size() { 2224 // Seems redundant as all get out. 2225 assert(os::Aix::page_size() != -1, "must call os::init"); 2226 return os::Aix::page_size(); 2227 } 2228 2229 // Aix allocates memory by pages. 2230 int os::vm_allocation_granularity() { 2231 assert(os::Aix::page_size() != -1, "must call os::init"); 2232 return os::Aix::page_size(); 2233 } 2234 2235 #ifdef PRODUCT 2236 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2237 int err) { 2238 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2239 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2240 os::errno_name(err), err); 2241 } 2242 #endif 2243 2244 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2245 const char* mesg) { 2246 assert(mesg != NULL, "mesg must be specified"); 2247 if (!pd_commit_memory(addr, size, exec)) { 2248 // Add extra info in product mode for vm_exit_out_of_memory(): 2249 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2250 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2251 } 2252 } 2253 2254 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2255 2256 assert(is_aligned_to(addr, os::vm_page_size()), 2257 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2258 p2i(addr), os::vm_page_size()); 2259 assert(is_aligned_to(size, os::vm_page_size()), 2260 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2261 size, os::vm_page_size()); 2262 2263 vmembk_t* const vmi = vmembk_find(addr); 2264 guarantee0(vmi); 2265 vmi->assert_is_valid_subrange(addr, size); 2266 2267 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1); 2268 2269 if (UseExplicitCommit) { 2270 // AIX commits memory on touch. So, touch all pages to be committed. 2271 for (char* p = addr; p < (addr + size); p += 4*K) { 2272 *p = '\0'; 2273 } 2274 } 2275 2276 return true; 2277 } 2278 2279 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2280 return pd_commit_memory(addr, size, exec); 2281 } 2282 2283 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2284 size_t alignment_hint, bool exec, 2285 const char* mesg) { 2286 // Alignment_hint is ignored on this OS. 2287 pd_commit_memory_or_exit(addr, size, exec, mesg); 2288 } 2289 2290 bool os::pd_uncommit_memory(char* addr, size_t size) { 2291 assert(is_aligned_to(addr, os::vm_page_size()), 2292 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2293 p2i(addr), os::vm_page_size()); 2294 assert(is_aligned_to(size, os::vm_page_size()), 2295 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2296 size, os::vm_page_size()); 2297 2298 // Dynamically do different things for mmap/shmat. 2299 const vmembk_t* const vmi = vmembk_find(addr); 2300 guarantee0(vmi); 2301 vmi->assert_is_valid_subrange(addr, size); 2302 2303 if (vmi->type == VMEM_SHMATED) { 2304 return uncommit_shmated_memory(addr, size); 2305 } else { 2306 return uncommit_mmaped_memory(addr, size); 2307 } 2308 } 2309 2310 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2311 // Do not call this; no need to commit stack pages on AIX. 2312 ShouldNotReachHere(); 2313 return true; 2314 } 2315 2316 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2317 // Do not call this; no need to commit stack pages on AIX. 2318 ShouldNotReachHere(); 2319 return true; 2320 } 2321 2322 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2323 } 2324 2325 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2326 } 2327 2328 void os::numa_make_global(char *addr, size_t bytes) { 2329 } 2330 2331 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2332 } 2333 2334 bool os::numa_topology_changed() { 2335 return false; 2336 } 2337 2338 size_t os::numa_get_groups_num() { 2339 return 1; 2340 } 2341 2342 int os::numa_get_group_id() { 2343 return 0; 2344 } 2345 2346 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2347 if (size > 0) { 2348 ids[0] = 0; 2349 return 1; 2350 } 2351 return 0; 2352 } 2353 2354 bool os::get_page_info(char *start, page_info* info) { 2355 return false; 2356 } 2357 2358 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2359 return end; 2360 } 2361 2362 // Reserves and attaches a shared memory segment. 2363 // Will assert if a wish address is given and could not be obtained. 2364 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2365 2366 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2367 // thereby clobbering old mappings at that place. That is probably 2368 // not intended, never used and almost certainly an error were it 2369 // ever be used this way (to try attaching at a specified address 2370 // without clobbering old mappings an alternate API exists, 2371 // os::attempt_reserve_memory_at()). 2372 // Instead of mimicking the dangerous coding of the other platforms, here I 2373 // just ignore the request address (release) or assert(debug). 2374 assert0(requested_addr == NULL); 2375 2376 // Always round to os::vm_page_size(), which may be larger than 4K. 2377 bytes = align_up(bytes, os::vm_page_size()); 2378 const size_t alignment_hint0 = 2379 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2380 2381 // In 4K mode always use mmap. 2382 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2383 if (os::vm_page_size() == 4*K) { 2384 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2385 } else { 2386 if (bytes >= Use64KPagesThreshold) { 2387 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2388 } else { 2389 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2390 } 2391 } 2392 } 2393 2394 bool os::pd_release_memory(char* addr, size_t size) { 2395 2396 // Dynamically do different things for mmap/shmat. 2397 vmembk_t* const vmi = vmembk_find(addr); 2398 guarantee0(vmi); 2399 2400 // Always round to os::vm_page_size(), which may be larger than 4K. 2401 size = align_up(size, os::vm_page_size()); 2402 addr = align_up(addr, os::vm_page_size()); 2403 2404 bool rc = false; 2405 bool remove_bookkeeping = false; 2406 if (vmi->type == VMEM_SHMATED) { 2407 // For shmatted memory, we do: 2408 // - If user wants to release the whole range, release the memory (shmdt). 2409 // - If user only wants to release a partial range, uncommit (disclaim) that 2410 // range. That way, at least, we do not use memory anymore (bust still page 2411 // table space). 2412 vmi->assert_is_valid_subrange(addr, size); 2413 if (addr == vmi->addr && size == vmi->size) { 2414 rc = release_shmated_memory(addr, size); 2415 remove_bookkeeping = true; 2416 } else { 2417 rc = uncommit_shmated_memory(addr, size); 2418 } 2419 } else { 2420 // User may unmap partial regions but region has to be fully contained. 2421 #ifdef ASSERT 2422 vmi->assert_is_valid_subrange(addr, size); 2423 #endif 2424 rc = release_mmaped_memory(addr, size); 2425 remove_bookkeeping = true; 2426 } 2427 2428 // update bookkeeping 2429 if (rc && remove_bookkeeping) { 2430 vmembk_remove(vmi); 2431 } 2432 2433 return rc; 2434 } 2435 2436 static bool checked_mprotect(char* addr, size_t size, int prot) { 2437 2438 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2439 // not tell me if protection failed when trying to protect an un-protectable range. 2440 // 2441 // This means if the memory was allocated using shmget/shmat, protection wont work 2442 // but mprotect will still return 0: 2443 // 2444 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2445 2446 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2447 2448 if (!rc) { 2449 const char* const s_errno = os::errno_name(errno); 2450 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2451 return false; 2452 } 2453 2454 // mprotect success check 2455 // 2456 // Mprotect said it changed the protection but can I believe it? 2457 // 2458 // To be sure I need to check the protection afterwards. Try to 2459 // read from protected memory and check whether that causes a segfault. 2460 // 2461 if (!os::Aix::xpg_sus_mode()) { 2462 2463 if (CanUseSafeFetch32()) { 2464 2465 const bool read_protected = 2466 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2467 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2468 2469 if (prot & PROT_READ) { 2470 rc = !read_protected; 2471 } else { 2472 rc = read_protected; 2473 } 2474 2475 if (!rc) { 2476 if (os::Aix::on_pase()) { 2477 // There is an issue on older PASE systems where mprotect() will return success but the 2478 // memory will not be protected. 2479 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2480 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2481 // a stack. It is an OS error. 2482 // 2483 // A valid strategy is just to try again. This usually works. :-/ 2484 2485 ::usleep(1000); 2486 if (::mprotect(addr, size, prot) == 0) { 2487 const bool read_protected_2 = 2488 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2489 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2490 rc = true; 2491 } 2492 } 2493 } 2494 } 2495 } 2496 2497 assert(rc == true, "mprotect failed."); 2498 2499 return rc; 2500 } 2501 2502 // Set protections specified 2503 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2504 unsigned int p = 0; 2505 switch (prot) { 2506 case MEM_PROT_NONE: p = PROT_NONE; break; 2507 case MEM_PROT_READ: p = PROT_READ; break; 2508 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2509 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2510 default: 2511 ShouldNotReachHere(); 2512 } 2513 // is_committed is unused. 2514 return checked_mprotect(addr, size, p); 2515 } 2516 2517 bool os::guard_memory(char* addr, size_t size) { 2518 return checked_mprotect(addr, size, PROT_NONE); 2519 } 2520 2521 bool os::unguard_memory(char* addr, size_t size) { 2522 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2523 } 2524 2525 // Large page support 2526 2527 static size_t _large_page_size = 0; 2528 2529 // Enable large page support if OS allows that. 2530 void os::large_page_init() { 2531 return; // Nothing to do. See query_multipage_support and friends. 2532 } 2533 2534 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2535 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement 2536 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()), 2537 // so this is not needed. 2538 assert(false, "should not be called on AIX"); 2539 return NULL; 2540 } 2541 2542 bool os::release_memory_special(char* base, size_t bytes) { 2543 // Detaching the SHM segment will also delete it, see reserve_memory_special(). 2544 Unimplemented(); 2545 return false; 2546 } 2547 2548 size_t os::large_page_size() { 2549 return _large_page_size; 2550 } 2551 2552 bool os::can_commit_large_page_memory() { 2553 // Does not matter, we do not support huge pages. 2554 return false; 2555 } 2556 2557 bool os::can_execute_large_page_memory() { 2558 // Does not matter, we do not support huge pages. 2559 return false; 2560 } 2561 2562 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2563 assert(file_desc >= 0, "file_desc is not valid"); 2564 char* result = NULL; 2565 2566 // Always round to os::vm_page_size(), which may be larger than 4K. 2567 bytes = align_up(bytes, os::vm_page_size()); 2568 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2569 2570 if (result != NULL) { 2571 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2572 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2573 } 2574 } 2575 return result; 2576 } 2577 2578 // Reserve memory at an arbitrary address, only if that area is 2579 // available (and not reserved for something else). 2580 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2581 char* addr = NULL; 2582 2583 // Always round to os::vm_page_size(), which may be larger than 4K. 2584 bytes = align_up(bytes, os::vm_page_size()); 2585 2586 // In 4K mode always use mmap. 2587 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2588 if (os::vm_page_size() == 4*K) { 2589 return reserve_mmaped_memory(bytes, requested_addr, 0); 2590 } else { 2591 if (bytes >= Use64KPagesThreshold) { 2592 return reserve_shmated_memory(bytes, requested_addr, 0); 2593 } else { 2594 return reserve_mmaped_memory(bytes, requested_addr, 0); 2595 } 2596 } 2597 2598 return addr; 2599 } 2600 2601 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2602 return ::read(fd, buf, nBytes); 2603 } 2604 2605 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2606 return ::pread(fd, buf, nBytes, offset); 2607 } 2608 2609 void os::naked_short_sleep(jlong ms) { 2610 struct timespec req; 2611 2612 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2613 req.tv_sec = 0; 2614 if (ms > 0) { 2615 req.tv_nsec = (ms % 1000) * 1000000; 2616 } 2617 else { 2618 req.tv_nsec = 1; 2619 } 2620 2621 nanosleep(&req, NULL); 2622 2623 return; 2624 } 2625 2626 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2627 void os::infinite_sleep() { 2628 while (true) { // sleep forever ... 2629 ::sleep(100); // ... 100 seconds at a time 2630 } 2631 } 2632 2633 // Used to convert frequent JVM_Yield() to nops 2634 bool os::dont_yield() { 2635 return DontYieldALot; 2636 } 2637 2638 void os::naked_yield() { 2639 sched_yield(); 2640 } 2641 2642 //////////////////////////////////////////////////////////////////////////////// 2643 // thread priority support 2644 2645 // From AIX manpage to pthread_setschedparam 2646 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2647 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2648 // 2649 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2650 // range from 40 to 80, where 40 is the least favored priority and 80 2651 // is the most favored." 2652 // 2653 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2654 // scheduling there; however, this still leaves iSeries.) 2655 // 2656 // We use the same values for AIX and PASE. 2657 int os::java_to_os_priority[CriticalPriority + 1] = { 2658 54, // 0 Entry should never be used 2659 2660 55, // 1 MinPriority 2661 55, // 2 2662 56, // 3 2663 2664 56, // 4 2665 57, // 5 NormPriority 2666 57, // 6 2667 2668 58, // 7 2669 58, // 8 2670 59, // 9 NearMaxPriority 2671 2672 60, // 10 MaxPriority 2673 2674 60 // 11 CriticalPriority 2675 }; 2676 2677 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2678 if (!UseThreadPriorities) return OS_OK; 2679 pthread_t thr = thread->osthread()->pthread_id(); 2680 int policy = SCHED_OTHER; 2681 struct sched_param param; 2682 param.sched_priority = newpri; 2683 int ret = pthread_setschedparam(thr, policy, ¶m); 2684 2685 if (ret != 0) { 2686 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2687 (int)thr, newpri, ret, os::errno_name(ret)); 2688 } 2689 return (ret == 0) ? OS_OK : OS_ERR; 2690 } 2691 2692 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2693 if (!UseThreadPriorities) { 2694 *priority_ptr = java_to_os_priority[NormPriority]; 2695 return OS_OK; 2696 } 2697 pthread_t thr = thread->osthread()->pthread_id(); 2698 int policy = SCHED_OTHER; 2699 struct sched_param param; 2700 int ret = pthread_getschedparam(thr, &policy, ¶m); 2701 *priority_ptr = param.sched_priority; 2702 2703 return (ret == 0) ? OS_OK : OS_ERR; 2704 } 2705 2706 // Hint to the underlying OS that a task switch would not be good. 2707 // Void return because it's a hint and can fail. 2708 void os::hint_no_preempt() {} 2709 2710 //////////////////////////////////////////////////////////////////////////////// 2711 // suspend/resume support 2712 2713 // The low-level signal-based suspend/resume support is a remnant from the 2714 // old VM-suspension that used to be for java-suspension, safepoints etc, 2715 // within hotspot. Currently used by JFR's OSThreadSampler 2716 // 2717 // The remaining code is greatly simplified from the more general suspension 2718 // code that used to be used. 2719 // 2720 // The protocol is quite simple: 2721 // - suspend: 2722 // - sends a signal to the target thread 2723 // - polls the suspend state of the osthread using a yield loop 2724 // - target thread signal handler (SR_handler) sets suspend state 2725 // and blocks in sigsuspend until continued 2726 // - resume: 2727 // - sets target osthread state to continue 2728 // - sends signal to end the sigsuspend loop in the SR_handler 2729 // 2730 // Note that the SR_lock plays no role in this suspend/resume protocol, 2731 // but is checked for NULL in SR_handler as a thread termination indicator. 2732 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2733 // 2734 // Note that resume_clear_context() and suspend_save_context() are needed 2735 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2736 // which in part is used by: 2737 // - Forte Analyzer: AsyncGetCallTrace() 2738 // - StackBanging: get_frame_at_stack_banging_point() 2739 2740 static void resume_clear_context(OSThread *osthread) { 2741 osthread->set_ucontext(NULL); 2742 osthread->set_siginfo(NULL); 2743 } 2744 2745 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2746 osthread->set_ucontext(context); 2747 osthread->set_siginfo(siginfo); 2748 } 2749 2750 // 2751 // Handler function invoked when a thread's execution is suspended or 2752 // resumed. We have to be careful that only async-safe functions are 2753 // called here (Note: most pthread functions are not async safe and 2754 // should be avoided.) 2755 // 2756 // Note: sigwait() is a more natural fit than sigsuspend() from an 2757 // interface point of view, but sigwait() prevents the signal hander 2758 // from being run. libpthread would get very confused by not having 2759 // its signal handlers run and prevents sigwait()'s use with the 2760 // mutex granting granting signal. 2761 // 2762 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2763 // 2764 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2765 // Save and restore errno to avoid confusing native code with EINTR 2766 // after sigsuspend. 2767 int old_errno = errno; 2768 2769 Thread* thread = Thread::current_or_null_safe(); 2770 assert(thread != NULL, "Missing current thread in SR_handler"); 2771 2772 // On some systems we have seen signal delivery get "stuck" until the signal 2773 // mask is changed as part of thread termination. Check that the current thread 2774 // has not already terminated (via SR_lock()) - else the following assertion 2775 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2776 // destructor has completed. 2777 2778 if (thread->SR_lock() == NULL) { 2779 return; 2780 } 2781 2782 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2783 2784 OSThread* osthread = thread->osthread(); 2785 2786 os::SuspendResume::State current = osthread->sr.state(); 2787 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2788 suspend_save_context(osthread, siginfo, context); 2789 2790 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2791 os::SuspendResume::State state = osthread->sr.suspended(); 2792 if (state == os::SuspendResume::SR_SUSPENDED) { 2793 sigset_t suspend_set; // signals for sigsuspend() 2794 2795 // get current set of blocked signals and unblock resume signal 2796 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2797 sigdelset(&suspend_set, SR_signum); 2798 2799 // wait here until we are resumed 2800 while (1) { 2801 sigsuspend(&suspend_set); 2802 2803 os::SuspendResume::State result = osthread->sr.running(); 2804 if (result == os::SuspendResume::SR_RUNNING) { 2805 break; 2806 } 2807 } 2808 2809 } else if (state == os::SuspendResume::SR_RUNNING) { 2810 // request was cancelled, continue 2811 } else { 2812 ShouldNotReachHere(); 2813 } 2814 2815 resume_clear_context(osthread); 2816 } else if (current == os::SuspendResume::SR_RUNNING) { 2817 // request was cancelled, continue 2818 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2819 // ignore 2820 } else { 2821 ShouldNotReachHere(); 2822 } 2823 2824 errno = old_errno; 2825 } 2826 2827 static int SR_initialize() { 2828 struct sigaction act; 2829 char *s; 2830 // Get signal number to use for suspend/resume 2831 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2832 int sig = ::strtol(s, 0, 10); 2833 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2834 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2835 SR_signum = sig; 2836 } else { 2837 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2838 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2839 } 2840 } 2841 2842 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2843 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2844 2845 sigemptyset(&SR_sigset); 2846 sigaddset(&SR_sigset, SR_signum); 2847 2848 // Set up signal handler for suspend/resume. 2849 act.sa_flags = SA_RESTART|SA_SIGINFO; 2850 act.sa_handler = (void (*)(int)) SR_handler; 2851 2852 // SR_signum is blocked by default. 2853 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2854 2855 if (sigaction(SR_signum, &act, 0) == -1) { 2856 return -1; 2857 } 2858 2859 // Save signal flag 2860 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2861 return 0; 2862 } 2863 2864 static int SR_finalize() { 2865 return 0; 2866 } 2867 2868 static int sr_notify(OSThread* osthread) { 2869 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2870 assert_status(status == 0, status, "pthread_kill"); 2871 return status; 2872 } 2873 2874 // "Randomly" selected value for how long we want to spin 2875 // before bailing out on suspending a thread, also how often 2876 // we send a signal to a thread we want to resume 2877 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2878 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2879 2880 // returns true on success and false on error - really an error is fatal 2881 // but this seems the normal response to library errors 2882 static bool do_suspend(OSThread* osthread) { 2883 assert(osthread->sr.is_running(), "thread should be running"); 2884 // mark as suspended and send signal 2885 2886 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2887 // failed to switch, state wasn't running? 2888 ShouldNotReachHere(); 2889 return false; 2890 } 2891 2892 if (sr_notify(osthread) != 0) { 2893 // try to cancel, switch to running 2894 2895 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2896 if (result == os::SuspendResume::SR_RUNNING) { 2897 // cancelled 2898 return false; 2899 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2900 // somehow managed to suspend 2901 return true; 2902 } else { 2903 ShouldNotReachHere(); 2904 return false; 2905 } 2906 } 2907 2908 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2909 2910 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2911 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2912 os::naked_yield(); 2913 } 2914 2915 // timeout, try to cancel the request 2916 if (n >= RANDOMLY_LARGE_INTEGER) { 2917 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2918 if (cancelled == os::SuspendResume::SR_RUNNING) { 2919 return false; 2920 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2921 return true; 2922 } else { 2923 ShouldNotReachHere(); 2924 return false; 2925 } 2926 } 2927 } 2928 2929 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2930 return true; 2931 } 2932 2933 static void do_resume(OSThread* osthread) { 2934 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2935 2936 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2937 // failed to switch to WAKEUP_REQUEST 2938 ShouldNotReachHere(); 2939 return; 2940 } 2941 2942 while (!osthread->sr.is_running()) { 2943 if (sr_notify(osthread) == 0) { 2944 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2945 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2946 os::naked_yield(); 2947 } 2948 } 2949 } else { 2950 ShouldNotReachHere(); 2951 } 2952 } 2953 2954 guarantee(osthread->sr.is_running(), "Must be running!"); 2955 } 2956 2957 /////////////////////////////////////////////////////////////////////////////////// 2958 // signal handling (except suspend/resume) 2959 2960 // This routine may be used by user applications as a "hook" to catch signals. 2961 // The user-defined signal handler must pass unrecognized signals to this 2962 // routine, and if it returns true (non-zero), then the signal handler must 2963 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2964 // routine will never retun false (zero), but instead will execute a VM panic 2965 // routine kill the process. 2966 // 2967 // If this routine returns false, it is OK to call it again. This allows 2968 // the user-defined signal handler to perform checks either before or after 2969 // the VM performs its own checks. Naturally, the user code would be making 2970 // a serious error if it tried to handle an exception (such as a null check 2971 // or breakpoint) that the VM was generating for its own correct operation. 2972 // 2973 // This routine may recognize any of the following kinds of signals: 2974 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2975 // It should be consulted by handlers for any of those signals. 2976 // 2977 // The caller of this routine must pass in the three arguments supplied 2978 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 2979 // field of the structure passed to sigaction(). This routine assumes that 2980 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 2981 // 2982 // Note that the VM will print warnings if it detects conflicting signal 2983 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 2984 // 2985 extern "C" JNIEXPORT int 2986 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 2987 2988 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 2989 // to be the thing to call; documentation is not terribly clear about whether 2990 // pthread_sigmask also works, and if it does, whether it does the same. 2991 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 2992 const int rc = ::pthread_sigmask(how, set, oset); 2993 // return value semantics differ slightly for error case: 2994 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 2995 // (so, pthread_sigmask is more theadsafe for error handling) 2996 // But success is always 0. 2997 return rc == 0 ? true : false; 2998 } 2999 3000 // Function to unblock all signals which are, according 3001 // to POSIX, typical program error signals. If they happen while being blocked, 3002 // they typically will bring down the process immediately. 3003 bool unblock_program_error_signals() { 3004 sigset_t set; 3005 ::sigemptyset(&set); 3006 ::sigaddset(&set, SIGILL); 3007 ::sigaddset(&set, SIGBUS); 3008 ::sigaddset(&set, SIGFPE); 3009 ::sigaddset(&set, SIGSEGV); 3010 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 3011 } 3012 3013 // Renamed from 'signalHandler' to avoid collision with other shared libs. 3014 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 3015 assert(info != NULL && uc != NULL, "it must be old kernel"); 3016 3017 // Never leave program error signals blocked; 3018 // on all our platforms they would bring down the process immediately when 3019 // getting raised while being blocked. 3020 unblock_program_error_signals(); 3021 3022 int orig_errno = errno; // Preserve errno value over signal handler. 3023 JVM_handle_aix_signal(sig, info, uc, true); 3024 errno = orig_errno; 3025 } 3026 3027 // This boolean allows users to forward their own non-matching signals 3028 // to JVM_handle_aix_signal, harmlessly. 3029 bool os::Aix::signal_handlers_are_installed = false; 3030 3031 // For signal-chaining 3032 struct sigaction sigact[NSIG]; 3033 sigset_t sigs; 3034 bool os::Aix::libjsig_is_loaded = false; 3035 typedef struct sigaction *(*get_signal_t)(int); 3036 get_signal_t os::Aix::get_signal_action = NULL; 3037 3038 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3039 struct sigaction *actp = NULL; 3040 3041 if (libjsig_is_loaded) { 3042 // Retrieve the old signal handler from libjsig 3043 actp = (*get_signal_action)(sig); 3044 } 3045 if (actp == NULL) { 3046 // Retrieve the preinstalled signal handler from jvm 3047 actp = get_preinstalled_handler(sig); 3048 } 3049 3050 return actp; 3051 } 3052 3053 static bool call_chained_handler(struct sigaction *actp, int sig, 3054 siginfo_t *siginfo, void *context) { 3055 // Call the old signal handler 3056 if (actp->sa_handler == SIG_DFL) { 3057 // It's more reasonable to let jvm treat it as an unexpected exception 3058 // instead of taking the default action. 3059 return false; 3060 } else if (actp->sa_handler != SIG_IGN) { 3061 if ((actp->sa_flags & SA_NODEFER) == 0) { 3062 // automaticlly block the signal 3063 sigaddset(&(actp->sa_mask), sig); 3064 } 3065 3066 sa_handler_t hand = NULL; 3067 sa_sigaction_t sa = NULL; 3068 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3069 // retrieve the chained handler 3070 if (siginfo_flag_set) { 3071 sa = actp->sa_sigaction; 3072 } else { 3073 hand = actp->sa_handler; 3074 } 3075 3076 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3077 actp->sa_handler = SIG_DFL; 3078 } 3079 3080 // try to honor the signal mask 3081 sigset_t oset; 3082 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3083 3084 // call into the chained handler 3085 if (siginfo_flag_set) { 3086 (*sa)(sig, siginfo, context); 3087 } else { 3088 (*hand)(sig); 3089 } 3090 3091 // restore the signal mask 3092 pthread_sigmask(SIG_SETMASK, &oset, 0); 3093 } 3094 // Tell jvm's signal handler the signal is taken care of. 3095 return true; 3096 } 3097 3098 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3099 bool chained = false; 3100 // signal-chaining 3101 if (UseSignalChaining) { 3102 struct sigaction *actp = get_chained_signal_action(sig); 3103 if (actp != NULL) { 3104 chained = call_chained_handler(actp, sig, siginfo, context); 3105 } 3106 } 3107 return chained; 3108 } 3109 3110 struct sigaction* os::Aix::get_preinstalled_handler(int sig) { 3111 if (sigismember(&sigs, sig)) { 3112 return &sigact[sig]; 3113 } 3114 return NULL; 3115 } 3116 3117 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3118 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3119 sigact[sig] = oldAct; 3120 sigaddset(&sigs, sig); 3121 } 3122 3123 // for diagnostic 3124 int sigflags[NSIG]; 3125 3126 int os::Aix::get_our_sigflags(int sig) { 3127 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3128 return sigflags[sig]; 3129 } 3130 3131 void os::Aix::set_our_sigflags(int sig, int flags) { 3132 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3133 if (sig > 0 && sig < NSIG) { 3134 sigflags[sig] = flags; 3135 } 3136 } 3137 3138 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3139 // Check for overwrite. 3140 struct sigaction oldAct; 3141 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3142 3143 void* oldhand = oldAct.sa_sigaction 3144 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3145 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3146 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3147 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3148 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3149 if (AllowUserSignalHandlers || !set_installed) { 3150 // Do not overwrite; user takes responsibility to forward to us. 3151 return; 3152 } else if (UseSignalChaining) { 3153 // save the old handler in jvm 3154 save_preinstalled_handler(sig, oldAct); 3155 // libjsig also interposes the sigaction() call below and saves the 3156 // old sigaction on it own. 3157 } else { 3158 fatal("Encountered unexpected pre-existing sigaction handler " 3159 "%#lx for signal %d.", (long)oldhand, sig); 3160 } 3161 } 3162 3163 struct sigaction sigAct; 3164 sigfillset(&(sigAct.sa_mask)); 3165 if (!set_installed) { 3166 sigAct.sa_handler = SIG_DFL; 3167 sigAct.sa_flags = SA_RESTART; 3168 } else { 3169 sigAct.sa_sigaction = javaSignalHandler; 3170 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3171 } 3172 // Save flags, which are set by ours 3173 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3174 sigflags[sig] = sigAct.sa_flags; 3175 3176 int ret = sigaction(sig, &sigAct, &oldAct); 3177 assert(ret == 0, "check"); 3178 3179 void* oldhand2 = oldAct.sa_sigaction 3180 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3181 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3182 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3183 } 3184 3185 // install signal handlers for signals that HotSpot needs to 3186 // handle in order to support Java-level exception handling. 3187 void os::Aix::install_signal_handlers() { 3188 if (!signal_handlers_are_installed) { 3189 signal_handlers_are_installed = true; 3190 3191 // signal-chaining 3192 typedef void (*signal_setting_t)(); 3193 signal_setting_t begin_signal_setting = NULL; 3194 signal_setting_t end_signal_setting = NULL; 3195 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3196 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3197 if (begin_signal_setting != NULL) { 3198 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3199 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3200 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3201 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3202 libjsig_is_loaded = true; 3203 assert(UseSignalChaining, "should enable signal-chaining"); 3204 } 3205 if (libjsig_is_loaded) { 3206 // Tell libjsig jvm is setting signal handlers. 3207 (*begin_signal_setting)(); 3208 } 3209 3210 ::sigemptyset(&sigs); 3211 set_signal_handler(SIGSEGV, true); 3212 set_signal_handler(SIGPIPE, true); 3213 set_signal_handler(SIGBUS, true); 3214 set_signal_handler(SIGILL, true); 3215 set_signal_handler(SIGFPE, true); 3216 set_signal_handler(SIGTRAP, true); 3217 set_signal_handler(SIGXFSZ, true); 3218 3219 if (libjsig_is_loaded) { 3220 // Tell libjsig jvm finishes setting signal handlers. 3221 (*end_signal_setting)(); 3222 } 3223 3224 // We don't activate signal checker if libjsig is in place, we trust ourselves 3225 // and if UserSignalHandler is installed all bets are off. 3226 // Log that signal checking is off only if -verbose:jni is specified. 3227 if (CheckJNICalls) { 3228 if (libjsig_is_loaded) { 3229 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3230 check_signals = false; 3231 } 3232 if (AllowUserSignalHandlers) { 3233 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3234 check_signals = false; 3235 } 3236 // Need to initialize check_signal_done. 3237 ::sigemptyset(&check_signal_done); 3238 } 3239 } 3240 } 3241 3242 static const char* get_signal_handler_name(address handler, 3243 char* buf, int buflen) { 3244 int offset; 3245 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3246 if (found) { 3247 // skip directory names 3248 const char *p1, *p2; 3249 p1 = buf; 3250 size_t len = strlen(os::file_separator()); 3251 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3252 // The way os::dll_address_to_library_name is implemented on Aix 3253 // right now, it always returns -1 for the offset which is not 3254 // terribly informative. 3255 // Will fix that. For now, omit the offset. 3256 jio_snprintf(buf, buflen, "%s", p1); 3257 } else { 3258 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3259 } 3260 return buf; 3261 } 3262 3263 static void print_signal_handler(outputStream* st, int sig, 3264 char* buf, size_t buflen) { 3265 struct sigaction sa; 3266 sigaction(sig, NULL, &sa); 3267 3268 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3269 3270 address handler = (sa.sa_flags & SA_SIGINFO) 3271 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3272 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3273 3274 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3275 st->print("SIG_DFL"); 3276 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3277 st->print("SIG_IGN"); 3278 } else { 3279 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3280 } 3281 3282 // Print readable mask. 3283 st->print(", sa_mask[0]="); 3284 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3285 3286 address rh = VMError::get_resetted_sighandler(sig); 3287 // May be, handler was resetted by VMError? 3288 if (rh != NULL) { 3289 handler = rh; 3290 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3291 } 3292 3293 // Print textual representation of sa_flags. 3294 st->print(", sa_flags="); 3295 os::Posix::print_sa_flags(st, sa.sa_flags); 3296 3297 // Check: is it our handler? 3298 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3299 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3300 // It is our signal handler. 3301 // Check for flags, reset system-used one! 3302 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3303 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3304 os::Aix::get_our_sigflags(sig)); 3305 } 3306 } 3307 st->cr(); 3308 } 3309 3310 #define DO_SIGNAL_CHECK(sig) \ 3311 if (!sigismember(&check_signal_done, sig)) \ 3312 os::Aix::check_signal_handler(sig) 3313 3314 // This method is a periodic task to check for misbehaving JNI applications 3315 // under CheckJNI, we can add any periodic checks here 3316 3317 void os::run_periodic_checks() { 3318 3319 if (check_signals == false) return; 3320 3321 // SEGV and BUS if overridden could potentially prevent 3322 // generation of hs*.log in the event of a crash, debugging 3323 // such a case can be very challenging, so we absolutely 3324 // check the following for a good measure: 3325 DO_SIGNAL_CHECK(SIGSEGV); 3326 DO_SIGNAL_CHECK(SIGILL); 3327 DO_SIGNAL_CHECK(SIGFPE); 3328 DO_SIGNAL_CHECK(SIGBUS); 3329 DO_SIGNAL_CHECK(SIGPIPE); 3330 DO_SIGNAL_CHECK(SIGXFSZ); 3331 if (UseSIGTRAP) { 3332 DO_SIGNAL_CHECK(SIGTRAP); 3333 } 3334 3335 // ReduceSignalUsage allows the user to override these handlers 3336 // see comments at the very top and jvm_md.h 3337 if (!ReduceSignalUsage) { 3338 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3339 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3340 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3341 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3342 } 3343 3344 DO_SIGNAL_CHECK(SR_signum); 3345 } 3346 3347 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3348 3349 static os_sigaction_t os_sigaction = NULL; 3350 3351 void os::Aix::check_signal_handler(int sig) { 3352 char buf[O_BUFLEN]; 3353 address jvmHandler = NULL; 3354 3355 struct sigaction act; 3356 if (os_sigaction == NULL) { 3357 // only trust the default sigaction, in case it has been interposed 3358 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3359 if (os_sigaction == NULL) return; 3360 } 3361 3362 os_sigaction(sig, (struct sigaction*)NULL, &act); 3363 3364 address thisHandler = (act.sa_flags & SA_SIGINFO) 3365 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3366 : CAST_FROM_FN_PTR(address, act.sa_handler); 3367 3368 switch(sig) { 3369 case SIGSEGV: 3370 case SIGBUS: 3371 case SIGFPE: 3372 case SIGPIPE: 3373 case SIGILL: 3374 case SIGXFSZ: 3375 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3376 break; 3377 3378 case SHUTDOWN1_SIGNAL: 3379 case SHUTDOWN2_SIGNAL: 3380 case SHUTDOWN3_SIGNAL: 3381 case BREAK_SIGNAL: 3382 jvmHandler = (address)user_handler(); 3383 break; 3384 3385 default: 3386 if (sig == SR_signum) { 3387 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3388 } else { 3389 return; 3390 } 3391 break; 3392 } 3393 3394 if (thisHandler != jvmHandler) { 3395 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3396 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3397 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3398 // No need to check this sig any longer 3399 sigaddset(&check_signal_done, sig); 3400 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3401 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3402 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3403 exception_name(sig, buf, O_BUFLEN)); 3404 } 3405 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3406 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3407 tty->print("expected:"); 3408 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3409 tty->cr(); 3410 tty->print(" found:"); 3411 os::Posix::print_sa_flags(tty, act.sa_flags); 3412 tty->cr(); 3413 // No need to check this sig any longer 3414 sigaddset(&check_signal_done, sig); 3415 } 3416 3417 // Dump all the signal 3418 if (sigismember(&check_signal_done, sig)) { 3419 print_signal_handlers(tty, buf, O_BUFLEN); 3420 } 3421 } 3422 3423 // To install functions for atexit system call 3424 extern "C" { 3425 static void perfMemory_exit_helper() { 3426 perfMemory_exit(); 3427 } 3428 } 3429 3430 // This is called _before_ the most of global arguments have been parsed. 3431 void os::init(void) { 3432 // This is basic, we want to know if that ever changes. 3433 // (Shared memory boundary is supposed to be a 256M aligned.) 3434 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3435 3436 // Record process break at startup. 3437 g_brk_at_startup = (address) ::sbrk(0); 3438 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3439 3440 // First off, we need to know whether we run on AIX or PASE, and 3441 // the OS level we run on. 3442 os::Aix::initialize_os_info(); 3443 3444 // Scan environment (SPEC1170 behaviour, etc). 3445 os::Aix::scan_environment(); 3446 3447 // Probe multipage support. 3448 query_multipage_support(); 3449 3450 // Act like we only have one page size by eliminating corner cases which 3451 // we did not support very well anyway. 3452 // We have two input conditions: 3453 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3454 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3455 // setting. 3456 // Data segment page size is important for us because it defines the thread stack page 3457 // size, which is needed for guard page handling, stack banging etc. 3458 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3459 // and should be allocated with 64k pages. 3460 // 3461 // So, we do the following: 3462 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3463 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3464 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3465 // 64k no --- AIX 5.2 ? --- 3466 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3467 3468 // We explicitly leave no option to change page size, because only upgrading would work, 3469 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3470 3471 if (g_multipage_support.datapsize == 4*K) { 3472 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3473 if (g_multipage_support.can_use_64K_pages) { 3474 // .. but we are able to use 64K pages dynamically. 3475 // This would be typical for java launchers which are not linked 3476 // with datapsize=64K (like, any other launcher but our own). 3477 // 3478 // In this case it would be smart to allocate the java heap with 64K 3479 // to get the performance benefit, and to fake 64k pages for the 3480 // data segment (when dealing with thread stacks). 3481 // 3482 // However, leave a possibility to downgrade to 4K, using 3483 // -XX:-Use64KPages. 3484 if (Use64KPages) { 3485 trcVerbose("64K page mode (faked for data segment)"); 3486 Aix::_page_size = 64*K; 3487 } else { 3488 trcVerbose("4K page mode (Use64KPages=off)"); 3489 Aix::_page_size = 4*K; 3490 } 3491 } else { 3492 // .. and not able to allocate 64k pages dynamically. Here, just 3493 // fall back to 4K paged mode and use mmap for everything. 3494 trcVerbose("4K page mode"); 3495 Aix::_page_size = 4*K; 3496 FLAG_SET_ERGO(bool, Use64KPages, false); 3497 } 3498 } else { 3499 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3500 // This normally means that we can allocate 64k pages dynamically. 3501 // (There is one special case where this may be false: EXTSHM=on. 3502 // but we decided to not support that mode). 3503 assert0(g_multipage_support.can_use_64K_pages); 3504 Aix::_page_size = 64*K; 3505 trcVerbose("64K page mode"); 3506 FLAG_SET_ERGO(bool, Use64KPages, true); 3507 } 3508 3509 // For now UseLargePages is just ignored. 3510 FLAG_SET_ERGO(bool, UseLargePages, false); 3511 _page_sizes[0] = 0; 3512 3513 // debug trace 3514 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3515 3516 // Next, we need to initialize libo4 and libperfstat libraries. 3517 if (os::Aix::on_pase()) { 3518 os::Aix::initialize_libo4(); 3519 } else { 3520 os::Aix::initialize_libperfstat(); 3521 } 3522 3523 // Reset the perfstat information provided by ODM. 3524 if (os::Aix::on_aix()) { 3525 libperfstat::perfstat_reset(); 3526 } 3527 3528 // Now initialze basic system properties. Note that for some of the values we 3529 // need libperfstat etc. 3530 os::Aix::initialize_system_info(); 3531 3532 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3533 3534 init_random(1234567); 3535 3536 // _main_thread points to the thread that created/loaded the JVM. 3537 Aix::_main_thread = pthread_self(); 3538 3539 initial_time_count = os::elapsed_counter(); 3540 3541 os::Posix::init(); 3542 } 3543 3544 // This is called _after_ the global arguments have been parsed. 3545 jint os::init_2(void) { 3546 3547 os::Posix::init_2(); 3548 3549 if (os::Aix::on_pase()) { 3550 trcVerbose("Running on PASE."); 3551 } else { 3552 trcVerbose("Running on AIX (not PASE)."); 3553 } 3554 3555 trcVerbose("processor count: %d", os::_processor_count); 3556 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3557 3558 // Initially build up the loaded dll map. 3559 LoadedLibraries::reload(); 3560 if (Verbose) { 3561 trcVerbose("Loaded Libraries: "); 3562 LoadedLibraries::print(tty); 3563 } 3564 3565 // initialize suspend/resume support - must do this before signal_sets_init() 3566 if (SR_initialize() != 0) { 3567 perror("SR_initialize failed"); 3568 return JNI_ERR; 3569 } 3570 3571 Aix::signal_sets_init(); 3572 Aix::install_signal_handlers(); 3573 // Initialize data for jdk.internal.misc.Signal 3574 if (!ReduceSignalUsage) { 3575 jdk_misc_signal_init(); 3576 } 3577 3578 // Check and sets minimum stack sizes against command line options 3579 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3580 return JNI_ERR; 3581 } 3582 3583 if (UseNUMA) { 3584 UseNUMA = false; 3585 warning("NUMA optimizations are not available on this OS."); 3586 } 3587 3588 if (MaxFDLimit) { 3589 // Set the number of file descriptors to max. print out error 3590 // if getrlimit/setrlimit fails but continue regardless. 3591 struct rlimit nbr_files; 3592 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3593 if (status != 0) { 3594 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3595 } else { 3596 nbr_files.rlim_cur = nbr_files.rlim_max; 3597 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3598 if (status != 0) { 3599 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3600 } 3601 } 3602 } 3603 3604 if (PerfAllowAtExitRegistration) { 3605 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3606 // At exit functions can be delayed until process exit time, which 3607 // can be problematic for embedded VM situations. Embedded VMs should 3608 // call DestroyJavaVM() to assure that VM resources are released. 3609 3610 // Note: perfMemory_exit_helper atexit function may be removed in 3611 // the future if the appropriate cleanup code can be added to the 3612 // VM_Exit VMOperation's doit method. 3613 if (atexit(perfMemory_exit_helper) != 0) { 3614 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3615 } 3616 } 3617 3618 return JNI_OK; 3619 } 3620 3621 // Mark the polling page as unreadable 3622 void os::make_polling_page_unreadable(void) { 3623 if (!guard_memory((char*)_polling_page, Aix::page_size())) { 3624 fatal("Could not disable polling page"); 3625 } 3626 }; 3627 3628 // Mark the polling page as readable 3629 void os::make_polling_page_readable(void) { 3630 // Changed according to os_linux.cpp. 3631 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { 3632 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page); 3633 } 3634 }; 3635 3636 int os::active_processor_count() { 3637 // User has overridden the number of active processors 3638 if (ActiveProcessorCount > 0) { 3639 log_trace(os)("active_processor_count: " 3640 "active processor count set by user : %d", 3641 ActiveProcessorCount); 3642 return ActiveProcessorCount; 3643 } 3644 3645 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3646 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3647 return online_cpus; 3648 } 3649 3650 void os::set_native_thread_name(const char *name) { 3651 // Not yet implemented. 3652 return; 3653 } 3654 3655 bool os::distribute_processes(uint length, uint* distribution) { 3656 // Not yet implemented. 3657 return false; 3658 } 3659 3660 bool os::bind_to_processor(uint processor_id) { 3661 // Not yet implemented. 3662 return false; 3663 } 3664 3665 void os::SuspendedThreadTask::internal_do_task() { 3666 if (do_suspend(_thread->osthread())) { 3667 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3668 do_task(context); 3669 do_resume(_thread->osthread()); 3670 } 3671 } 3672 3673 //////////////////////////////////////////////////////////////////////////////// 3674 // debug support 3675 3676 bool os::find(address addr, outputStream* st) { 3677 3678 st->print(PTR_FORMAT ": ", addr); 3679 3680 loaded_module_t lm; 3681 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3682 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3683 st->print_cr("%s", lm.path); 3684 return true; 3685 } 3686 3687 return false; 3688 } 3689 3690 //////////////////////////////////////////////////////////////////////////////// 3691 // misc 3692 3693 // This does not do anything on Aix. This is basically a hook for being 3694 // able to use structured exception handling (thread-local exception filters) 3695 // on, e.g., Win32. 3696 void 3697 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3698 JavaCallArguments* args, Thread* thread) { 3699 f(value, method, args, thread); 3700 } 3701 3702 void os::print_statistics() { 3703 } 3704 3705 bool os::message_box(const char* title, const char* message) { 3706 int i; 3707 fdStream err(defaultStream::error_fd()); 3708 for (i = 0; i < 78; i++) err.print_raw("="); 3709 err.cr(); 3710 err.print_raw_cr(title); 3711 for (i = 0; i < 78; i++) err.print_raw("-"); 3712 err.cr(); 3713 err.print_raw_cr(message); 3714 for (i = 0; i < 78; i++) err.print_raw("="); 3715 err.cr(); 3716 3717 char buf[16]; 3718 // Prevent process from exiting upon "read error" without consuming all CPU 3719 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3720 3721 return buf[0] == 'y' || buf[0] == 'Y'; 3722 } 3723 3724 // Is a (classpath) directory empty? 3725 bool os::dir_is_empty(const char* path) { 3726 DIR *dir = NULL; 3727 struct dirent *ptr; 3728 3729 dir = opendir(path); 3730 if (dir == NULL) return true; 3731 3732 /* Scan the directory */ 3733 bool result = true; 3734 char buf[sizeof(struct dirent) + MAX_PATH]; 3735 while (result && (ptr = ::readdir(dir)) != NULL) { 3736 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3737 result = false; 3738 } 3739 } 3740 closedir(dir); 3741 return result; 3742 } 3743 3744 // This code originates from JDK's sysOpen and open64_w 3745 // from src/solaris/hpi/src/system_md.c 3746 3747 int os::open(const char *path, int oflag, int mode) { 3748 3749 if (strlen(path) > MAX_PATH - 1) { 3750 errno = ENAMETOOLONG; 3751 return -1; 3752 } 3753 int fd; 3754 3755 fd = ::open64(path, oflag, mode); 3756 if (fd == -1) return -1; 3757 3758 // If the open succeeded, the file might still be a directory. 3759 { 3760 struct stat64 buf64; 3761 int ret = ::fstat64(fd, &buf64); 3762 int st_mode = buf64.st_mode; 3763 3764 if (ret != -1) { 3765 if ((st_mode & S_IFMT) == S_IFDIR) { 3766 errno = EISDIR; 3767 ::close(fd); 3768 return -1; 3769 } 3770 } else { 3771 ::close(fd); 3772 return -1; 3773 } 3774 } 3775 3776 // All file descriptors that are opened in the JVM and not 3777 // specifically destined for a subprocess should have the 3778 // close-on-exec flag set. If we don't set it, then careless 3rd 3779 // party native code might fork and exec without closing all 3780 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3781 // UNIXProcess.c), and this in turn might: 3782 // 3783 // - cause end-of-file to fail to be detected on some file 3784 // descriptors, resulting in mysterious hangs, or 3785 // 3786 // - might cause an fopen in the subprocess to fail on a system 3787 // suffering from bug 1085341. 3788 // 3789 // (Yes, the default setting of the close-on-exec flag is a Unix 3790 // design flaw.) 3791 // 3792 // See: 3793 // 1085341: 32-bit stdio routines should support file descriptors >255 3794 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3795 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3796 #ifdef FD_CLOEXEC 3797 { 3798 int flags = ::fcntl(fd, F_GETFD); 3799 if (flags != -1) 3800 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3801 } 3802 #endif 3803 3804 return fd; 3805 } 3806 3807 // create binary file, rewriting existing file if required 3808 int os::create_binary_file(const char* path, bool rewrite_existing) { 3809 int oflags = O_WRONLY | O_CREAT; 3810 if (!rewrite_existing) { 3811 oflags |= O_EXCL; 3812 } 3813 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3814 } 3815 3816 // return current position of file pointer 3817 jlong os::current_file_offset(int fd) { 3818 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3819 } 3820 3821 // move file pointer to the specified offset 3822 jlong os::seek_to_file_offset(int fd, jlong offset) { 3823 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3824 } 3825 3826 // This code originates from JDK's sysAvailable 3827 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3828 3829 int os::available(int fd, jlong *bytes) { 3830 jlong cur, end; 3831 int mode; 3832 struct stat64 buf64; 3833 3834 if (::fstat64(fd, &buf64) >= 0) { 3835 mode = buf64.st_mode; 3836 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3837 int n; 3838 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3839 *bytes = n; 3840 return 1; 3841 } 3842 } 3843 } 3844 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3845 return 0; 3846 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3847 return 0; 3848 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3849 return 0; 3850 } 3851 *bytes = end - cur; 3852 return 1; 3853 } 3854 3855 // Map a block of memory. 3856 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3857 char *addr, size_t bytes, bool read_only, 3858 bool allow_exec) { 3859 int prot; 3860 int flags = MAP_PRIVATE; 3861 3862 if (read_only) { 3863 prot = PROT_READ; 3864 flags = MAP_SHARED; 3865 } else { 3866 prot = PROT_READ | PROT_WRITE; 3867 flags = MAP_PRIVATE; 3868 } 3869 3870 if (allow_exec) { 3871 prot |= PROT_EXEC; 3872 } 3873 3874 if (addr != NULL) { 3875 flags |= MAP_FIXED; 3876 } 3877 3878 // Allow anonymous mappings if 'fd' is -1. 3879 if (fd == -1) { 3880 flags |= MAP_ANONYMOUS; 3881 } 3882 3883 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3884 fd, file_offset); 3885 if (mapped_address == MAP_FAILED) { 3886 return NULL; 3887 } 3888 return mapped_address; 3889 } 3890 3891 // Remap a block of memory. 3892 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3893 char *addr, size_t bytes, bool read_only, 3894 bool allow_exec) { 3895 // same as map_memory() on this OS 3896 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3897 allow_exec); 3898 } 3899 3900 // Unmap a block of memory. 3901 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3902 return munmap(addr, bytes) == 0; 3903 } 3904 3905 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3906 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3907 // of a thread. 3908 // 3909 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3910 // the fast estimate available on the platform. 3911 3912 jlong os::current_thread_cpu_time() { 3913 // return user + sys since the cost is the same 3914 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3915 assert(n >= 0, "negative CPU time"); 3916 return n; 3917 } 3918 3919 jlong os::thread_cpu_time(Thread* thread) { 3920 // consistent with what current_thread_cpu_time() returns 3921 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3922 assert(n >= 0, "negative CPU time"); 3923 return n; 3924 } 3925 3926 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3927 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3928 assert(n >= 0, "negative CPU time"); 3929 return n; 3930 } 3931 3932 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3933 bool error = false; 3934 3935 jlong sys_time = 0; 3936 jlong user_time = 0; 3937 3938 // Reimplemented using getthrds64(). 3939 // 3940 // Works like this: 3941 // For the thread in question, get the kernel thread id. Then get the 3942 // kernel thread statistics using that id. 3943 // 3944 // This only works of course when no pthread scheduling is used, 3945 // i.e. there is a 1:1 relationship to kernel threads. 3946 // On AIX, see AIXTHREAD_SCOPE variable. 3947 3948 pthread_t pthtid = thread->osthread()->pthread_id(); 3949 3950 // retrieve kernel thread id for the pthread: 3951 tid64_t tid = 0; 3952 struct __pthrdsinfo pinfo; 3953 // I just love those otherworldly IBM APIs which force me to hand down 3954 // dummy buffers for stuff I dont care for... 3955 char dummy[1]; 3956 int dummy_size = sizeof(dummy); 3957 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3958 dummy, &dummy_size) == 0) { 3959 tid = pinfo.__pi_tid; 3960 } else { 3961 tty->print_cr("pthread_getthrds_np failed."); 3962 error = true; 3963 } 3964 3965 // retrieve kernel timing info for that kernel thread 3966 if (!error) { 3967 struct thrdentry64 thrdentry; 3968 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 3969 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 3970 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 3971 } else { 3972 tty->print_cr("pthread_getthrds_np failed."); 3973 error = true; 3974 } 3975 } 3976 3977 if (p_sys_time) { 3978 *p_sys_time = sys_time; 3979 } 3980 3981 if (p_user_time) { 3982 *p_user_time = user_time; 3983 } 3984 3985 if (error) { 3986 return false; 3987 } 3988 3989 return true; 3990 } 3991 3992 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 3993 jlong sys_time; 3994 jlong user_time; 3995 3996 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 3997 return -1; 3998 } 3999 4000 return user_sys_cpu_time ? sys_time + user_time : user_time; 4001 } 4002 4003 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4004 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4005 info_ptr->may_skip_backward = false; // elapsed time not wall time 4006 info_ptr->may_skip_forward = false; // elapsed time not wall time 4007 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4008 } 4009 4010 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4011 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4012 info_ptr->may_skip_backward = false; // elapsed time not wall time 4013 info_ptr->may_skip_forward = false; // elapsed time not wall time 4014 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4015 } 4016 4017 bool os::is_thread_cpu_time_supported() { 4018 return true; 4019 } 4020 4021 // System loadavg support. Returns -1 if load average cannot be obtained. 4022 // For now just return the system wide load average (no processor sets). 4023 int os::loadavg(double values[], int nelem) { 4024 4025 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 4026 guarantee(values, "argument error"); 4027 4028 if (os::Aix::on_pase()) { 4029 4030 // AS/400 PASE: use libo4 porting library 4031 double v[3] = { 0.0, 0.0, 0.0 }; 4032 4033 if (libo4::get_load_avg(v, v + 1, v + 2)) { 4034 for (int i = 0; i < nelem; i ++) { 4035 values[i] = v[i]; 4036 } 4037 return nelem; 4038 } else { 4039 return -1; 4040 } 4041 4042 } else { 4043 4044 // AIX: use libperfstat 4045 libperfstat::cpuinfo_t ci; 4046 if (libperfstat::get_cpuinfo(&ci)) { 4047 for (int i = 0; i < nelem; i++) { 4048 values[i] = ci.loadavg[i]; 4049 } 4050 } else { 4051 return -1; 4052 } 4053 return nelem; 4054 } 4055 } 4056 4057 void os::pause() { 4058 char filename[MAX_PATH]; 4059 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4060 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4061 } else { 4062 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4063 } 4064 4065 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4066 if (fd != -1) { 4067 struct stat buf; 4068 ::close(fd); 4069 while (::stat(filename, &buf) == 0) { 4070 (void)::poll(NULL, 0, 100); 4071 } 4072 } else { 4073 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4074 } 4075 } 4076 4077 bool os::is_primordial_thread(void) { 4078 if (pthread_self() == (pthread_t)1) { 4079 return true; 4080 } else { 4081 return false; 4082 } 4083 } 4084 4085 // OS recognitions (PASE/AIX, OS level) call this before calling any 4086 // one of Aix::on_pase(), Aix::os_version() static 4087 void os::Aix::initialize_os_info() { 4088 4089 assert(_on_pase == -1 && _os_version == 0, "already called."); 4090 4091 struct utsname uts; 4092 memset(&uts, 0, sizeof(uts)); 4093 strcpy(uts.sysname, "?"); 4094 if (::uname(&uts) == -1) { 4095 trcVerbose("uname failed (%d)", errno); 4096 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4097 } else { 4098 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4099 "node \"%s\" machine \"%s\"\n", 4100 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4101 const int major = atoi(uts.version); 4102 assert(major > 0, "invalid OS version"); 4103 const int minor = atoi(uts.release); 4104 assert(minor > 0, "invalid OS release"); 4105 _os_version = (major << 24) | (minor << 16); 4106 char ver_str[20] = {0}; 4107 char *name_str = "unknown OS"; 4108 if (strcmp(uts.sysname, "OS400") == 0) { 4109 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4110 _on_pase = 1; 4111 if (os_version_short() < 0x0504) { 4112 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4113 assert(false, "OS/400 release too old."); 4114 } 4115 name_str = "OS/400 (pase)"; 4116 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4117 } else if (strcmp(uts.sysname, "AIX") == 0) { 4118 // We run on AIX. We do not support versions older than AIX 5.3. 4119 _on_pase = 0; 4120 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4121 odmWrapper::determine_os_kernel_version(&_os_version); 4122 if (os_version_short() < 0x0503) { 4123 trcVerbose("AIX release older than AIX 5.3 not supported."); 4124 assert(false, "AIX release too old."); 4125 } 4126 name_str = "AIX"; 4127 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4128 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4129 } else { 4130 assert(false, name_str); 4131 } 4132 trcVerbose("We run on %s %s", name_str, ver_str); 4133 } 4134 4135 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4136 } // end: os::Aix::initialize_os_info() 4137 4138 // Scan environment for important settings which might effect the VM. 4139 // Trace out settings. Warn about invalid settings and/or correct them. 4140 // 4141 // Must run after os::Aix::initialue_os_info(). 4142 void os::Aix::scan_environment() { 4143 4144 char* p; 4145 int rc; 4146 4147 // Warn explicity if EXTSHM=ON is used. That switch changes how 4148 // System V shared memory behaves. One effect is that page size of 4149 // shared memory cannot be change dynamically, effectivly preventing 4150 // large pages from working. 4151 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4152 // recommendation is (in OSS notes) to switch it off. 4153 p = ::getenv("EXTSHM"); 4154 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4155 if (p && strcasecmp(p, "ON") == 0) { 4156 _extshm = 1; 4157 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4158 if (!AllowExtshm) { 4159 // We allow under certain conditions the user to continue. However, we want this 4160 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4161 // that the VM is not able to allocate 64k pages for the heap. 4162 // We do not want to run with reduced performance. 4163 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4164 } 4165 } else { 4166 _extshm = 0; 4167 } 4168 4169 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4170 // Not tested, not supported. 4171 // 4172 // Note that it might be worth the trouble to test and to require it, if only to 4173 // get useful return codes for mprotect. 4174 // 4175 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4176 // exec() ? before loading the libjvm ? ....) 4177 p = ::getenv("XPG_SUS_ENV"); 4178 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4179 if (p && strcmp(p, "ON") == 0) { 4180 _xpg_sus_mode = 1; 4181 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4182 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4183 // clobber address ranges. If we ever want to support that, we have to do some 4184 // testing first. 4185 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4186 } else { 4187 _xpg_sus_mode = 0; 4188 } 4189 4190 if (os::Aix::on_pase()) { 4191 p = ::getenv("QIBM_MULTI_THREADED"); 4192 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4193 } 4194 4195 p = ::getenv("LDR_CNTRL"); 4196 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4197 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4198 if (p && ::strstr(p, "TEXTPSIZE")) { 4199 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4200 "you may experience hangs or crashes on OS/400 V7R1."); 4201 } 4202 } 4203 4204 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4205 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4206 4207 } // end: os::Aix::scan_environment() 4208 4209 // PASE: initialize the libo4 library (PASE porting library). 4210 void os::Aix::initialize_libo4() { 4211 guarantee(os::Aix::on_pase(), "OS/400 only."); 4212 if (!libo4::init()) { 4213 trcVerbose("libo4 initialization failed."); 4214 assert(false, "libo4 initialization failed"); 4215 } else { 4216 trcVerbose("libo4 initialized."); 4217 } 4218 } 4219 4220 // AIX: initialize the libperfstat library. 4221 void os::Aix::initialize_libperfstat() { 4222 assert(os::Aix::on_aix(), "AIX only"); 4223 if (!libperfstat::init()) { 4224 trcVerbose("libperfstat initialization failed."); 4225 assert(false, "libperfstat initialization failed"); 4226 } else { 4227 trcVerbose("libperfstat initialized."); 4228 } 4229 } 4230 4231 ///////////////////////////////////////////////////////////////////////////// 4232 // thread stack 4233 4234 // Get the current stack base from the OS (actually, the pthread library). 4235 // Note: usually not page aligned. 4236 address os::current_stack_base() { 4237 AixMisc::stackbounds_t bounds; 4238 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4239 guarantee(rc, "Unable to retrieve stack bounds."); 4240 return bounds.base; 4241 } 4242 4243 // Get the current stack size from the OS (actually, the pthread library). 4244 // Returned size is such that (base - size) is always aligned to page size. 4245 size_t os::current_stack_size() { 4246 AixMisc::stackbounds_t bounds; 4247 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4248 guarantee(rc, "Unable to retrieve stack bounds."); 4249 // Align the returned stack size such that the stack low address 4250 // is aligned to page size (Note: base is usually not and we do not care). 4251 // We need to do this because caller code will assume stack low address is 4252 // page aligned and will place guard pages without checking. 4253 address low = bounds.base - bounds.size; 4254 address low_aligned = (address)align_up(low, os::vm_page_size()); 4255 size_t s = bounds.base - low_aligned; 4256 return s; 4257 } 4258 4259 extern char** environ; 4260 4261 // Run the specified command in a separate process. Return its exit value, 4262 // or -1 on failure (e.g. can't fork a new process). 4263 // Unlike system(), this function can be called from signal handler. It 4264 // doesn't block SIGINT et al. 4265 int os::fork_and_exec(char* cmd) { 4266 char * argv[4] = {"sh", "-c", cmd, NULL}; 4267 4268 pid_t pid = fork(); 4269 4270 if (pid < 0) { 4271 // fork failed 4272 return -1; 4273 4274 } else if (pid == 0) { 4275 // child process 4276 4277 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4278 execve("/usr/bin/sh", argv, environ); 4279 4280 // execve failed 4281 _exit(-1); 4282 4283 } else { 4284 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4285 // care about the actual exit code, for now. 4286 4287 int status; 4288 4289 // Wait for the child process to exit. This returns immediately if 4290 // the child has already exited. */ 4291 while (waitpid(pid, &status, 0) < 0) { 4292 switch (errno) { 4293 case ECHILD: return 0; 4294 case EINTR: break; 4295 default: return -1; 4296 } 4297 } 4298 4299 if (WIFEXITED(status)) { 4300 // The child exited normally; get its exit code. 4301 return WEXITSTATUS(status); 4302 } else if (WIFSIGNALED(status)) { 4303 // The child exited because of a signal. 4304 // The best value to return is 0x80 + signal number, 4305 // because that is what all Unix shells do, and because 4306 // it allows callers to distinguish between process exit and 4307 // process death by signal. 4308 return 0x80 + WTERMSIG(status); 4309 } else { 4310 // Unknown exit code; pass it through. 4311 return status; 4312 } 4313 } 4314 return -1; 4315 } 4316 4317 // Get the default path to the core file 4318 // Returns the length of the string 4319 int os::get_core_path(char* buffer, size_t bufferSize) { 4320 const char* p = get_current_directory(buffer, bufferSize); 4321 4322 if (p == NULL) { 4323 assert(p != NULL, "failed to get current directory"); 4324 return 0; 4325 } 4326 4327 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4328 p, current_process_id()); 4329 4330 return strlen(buffer); 4331 } 4332 4333 #ifndef PRODUCT 4334 void TestReserveMemorySpecial_test() { 4335 // No tests available for this platform 4336 } 4337 #endif 4338 4339 bool os::start_debugging(char *buf, int buflen) { 4340 int len = (int)strlen(buf); 4341 char *p = &buf[len]; 4342 4343 jio_snprintf(p, buflen -len, 4344 "\n\n" 4345 "Do you want to debug the problem?\n\n" 4346 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4347 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4348 "Otherwise, press RETURN to abort...", 4349 os::current_process_id(), 4350 os::current_thread_id(), thread_self()); 4351 4352 bool yes = os::message_box("Unexpected Error", buf); 4353 4354 if (yes) { 4355 // yes, user asked VM to launch debugger 4356 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4357 4358 os::fork_and_exec(buf); 4359 yes = false; 4360 } 4361 return yes; 4362 } 4363 4364 static inline time_t get_mtime(const char* filename) { 4365 struct stat st; 4366 int ret = os::stat(filename, &st); 4367 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 4368 return st.st_mtime; 4369 } 4370 4371 int os::compare_file_modified_times(const char* file1, const char* file2) { 4372 time_t t1 = get_mtime(file1); 4373 time_t t2 = get_mtime(file2); 4374 return t1 - t2; 4375 }