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.inline.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 bool os::Aix::is_sig_ignored(int sig) { 626 struct sigaction oact; 627 sigaction(sig, (struct sigaction*)NULL, &oact); 628 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 629 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 630 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 631 return true; 632 } else { 633 return false; 634 } 635 } 636 637 void os::Aix::signal_sets_init() { 638 // Should also have an assertion stating we are still single-threaded. 639 assert(!signal_sets_initialized, "Already initialized"); 640 // Fill in signals that are necessarily unblocked for all threads in 641 // the VM. Currently, we unblock the following signals: 642 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 643 // by -Xrs (=ReduceSignalUsage)); 644 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 645 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 646 // the dispositions or masks wrt these signals. 647 // Programs embedding the VM that want to use the above signals for their 648 // own purposes must, at this time, use the "-Xrs" option to prevent 649 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 650 // (See bug 4345157, and other related bugs). 651 // In reality, though, unblocking these signals is really a nop, since 652 // these signals are not blocked by default. 653 sigemptyset(&unblocked_sigs); 654 sigaddset(&unblocked_sigs, SIGILL); 655 sigaddset(&unblocked_sigs, SIGSEGV); 656 sigaddset(&unblocked_sigs, SIGBUS); 657 sigaddset(&unblocked_sigs, SIGFPE); 658 sigaddset(&unblocked_sigs, SIGTRAP); 659 sigaddset(&unblocked_sigs, SR_signum); 660 661 if (!ReduceSignalUsage) { 662 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 663 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 664 } 665 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 666 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 667 } 668 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 669 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 670 } 671 } 672 // Fill in signals that are blocked by all but the VM thread. 673 sigemptyset(&vm_sigs); 674 if (!ReduceSignalUsage) 675 sigaddset(&vm_sigs, BREAK_SIGNAL); 676 debug_only(signal_sets_initialized = true); 677 } 678 679 // These are signals that are unblocked while a thread is running Java. 680 // (For some reason, they get blocked by default.) 681 sigset_t* os::Aix::unblocked_signals() { 682 assert(signal_sets_initialized, "Not initialized"); 683 return &unblocked_sigs; 684 } 685 686 // These are the signals that are blocked while a (non-VM) thread is 687 // running Java. Only the VM thread handles these signals. 688 sigset_t* os::Aix::vm_signals() { 689 assert(signal_sets_initialized, "Not initialized"); 690 return &vm_sigs; 691 } 692 693 void os::Aix::hotspot_sigmask(Thread* thread) { 694 695 //Save caller's signal mask before setting VM signal mask 696 sigset_t caller_sigmask; 697 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask); 698 699 OSThread* osthread = thread->osthread(); 700 osthread->set_caller_sigmask(caller_sigmask); 701 702 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL); 703 704 if (!ReduceSignalUsage) { 705 if (thread->is_VM_thread()) { 706 // Only the VM thread handles BREAK_SIGNAL ... 707 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 708 } else { 709 // ... all other threads block BREAK_SIGNAL 710 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 711 } 712 } 713 } 714 715 // retrieve memory information. 716 // Returns false if something went wrong; 717 // content of pmi undefined in this case. 718 bool os::Aix::get_meminfo(meminfo_t* pmi) { 719 720 assert(pmi, "get_meminfo: invalid parameter"); 721 722 memset(pmi, 0, sizeof(meminfo_t)); 723 724 if (os::Aix::on_pase()) { 725 // On PASE, use the libo4 porting library. 726 727 unsigned long long virt_total = 0; 728 unsigned long long real_total = 0; 729 unsigned long long real_free = 0; 730 unsigned long long pgsp_total = 0; 731 unsigned long long pgsp_free = 0; 732 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) { 733 pmi->virt_total = virt_total; 734 pmi->real_total = real_total; 735 pmi->real_free = real_free; 736 pmi->pgsp_total = pgsp_total; 737 pmi->pgsp_free = pgsp_free; 738 return true; 739 } 740 return false; 741 742 } else { 743 744 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics 745 // See: 746 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 747 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm 748 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 749 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 750 751 perfstat_memory_total_t psmt; 752 memset (&psmt, '\0', sizeof(psmt)); 753 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1); 754 if (rc == -1) { 755 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno); 756 assert(0, "perfstat_memory_total() failed"); 757 return false; 758 } 759 760 assert(rc == 1, "perfstat_memory_total() - weird return code"); 761 762 // excerpt from 763 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp 764 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm 765 // The fields of perfstat_memory_total_t: 766 // u_longlong_t virt_total Total virtual memory (in 4 KB pages). 767 // u_longlong_t real_total Total real memory (in 4 KB pages). 768 // u_longlong_t real_free Free real memory (in 4 KB pages). 769 // u_longlong_t pgsp_total Total paging space (in 4 KB pages). 770 // u_longlong_t pgsp_free Free paging space (in 4 KB pages). 771 772 pmi->virt_total = psmt.virt_total * 4096; 773 pmi->real_total = psmt.real_total * 4096; 774 pmi->real_free = psmt.real_free * 4096; 775 pmi->pgsp_total = psmt.pgsp_total * 4096; 776 pmi->pgsp_free = psmt.pgsp_free * 4096; 777 778 return true; 779 780 } 781 } // end os::Aix::get_meminfo 782 783 ////////////////////////////////////////////////////////////////////////////// 784 // create new thread 785 786 // Thread start routine for all newly created threads 787 static void *thread_native_entry(Thread *thread) { 788 789 // find out my own stack dimensions 790 { 791 // actually, this should do exactly the same as thread->record_stack_base_and_size... 792 thread->set_stack_base(os::current_stack_base()); 793 thread->set_stack_size(os::current_stack_size()); 794 } 795 796 const pthread_t pthread_id = ::pthread_self(); 797 const tid_t kernel_thread_id = ::thread_self(); 798 799 LogTarget(Info, os, thread) lt; 800 if (lt.is_enabled()) { 801 address low_address = thread->stack_end(); 802 address high_address = thread->stack_base(); 803 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT 804 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).", 805 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address, 806 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K); 807 } 808 809 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc() 810 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party 811 // tools hook pthread_create(). In this case, we may run into problems establishing 812 // guard pages on those stacks, because the stacks may reside in memory which is not 813 // protectable (shmated). 814 if (thread->stack_base() > ::sbrk(0)) { 815 log_warning(os, thread)("Thread stack not in data segment."); 816 } 817 818 // Try to randomize the cache line index of hot stack frames. 819 // This helps when threads of the same stack traces evict each other's 820 // cache lines. The threads can be either from the same JVM instance, or 821 // from different JVM instances. The benefit is especially true for 822 // processors with hyperthreading technology. 823 824 static int counter = 0; 825 int pid = os::current_process_id(); 826 alloca(((pid ^ counter++) & 7) * 128); 827 828 thread->initialize_thread_current(); 829 830 OSThread* osthread = thread->osthread(); 831 832 // Thread_id is pthread id. 833 osthread->set_thread_id(pthread_id); 834 835 // .. but keep kernel thread id too for diagnostics 836 osthread->set_kernel_thread_id(kernel_thread_id); 837 838 // Initialize signal mask for this thread. 839 os::Aix::hotspot_sigmask(thread); 840 841 // Initialize floating point control register. 842 os::Aix::init_thread_fpu_state(); 843 844 assert(osthread->get_state() == RUNNABLE, "invalid os thread state"); 845 846 // Call one more level start routine. 847 thread->run(); 848 849 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 850 os::current_thread_id(), (uintx) kernel_thread_id); 851 852 // If a thread has not deleted itself ("delete this") as part of its 853 // termination sequence, we have to ensure thread-local-storage is 854 // cleared before we actually terminate. No threads should ever be 855 // deleted asynchronously with respect to their termination. 856 if (Thread::current_or_null_safe() != NULL) { 857 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 858 thread->clear_thread_current(); 859 } 860 861 return 0; 862 } 863 864 bool os::create_thread(Thread* thread, ThreadType thr_type, 865 size_t req_stack_size) { 866 867 assert(thread->osthread() == NULL, "caller responsible"); 868 869 // Allocate the OSThread object. 870 OSThread* osthread = new OSThread(NULL, NULL); 871 if (osthread == NULL) { 872 return false; 873 } 874 875 // Set the correct thread state. 876 osthread->set_thread_type(thr_type); 877 878 // Initial state is ALLOCATED but not INITIALIZED 879 osthread->set_state(ALLOCATED); 880 881 thread->set_osthread(osthread); 882 883 // Init thread attributes. 884 pthread_attr_t attr; 885 pthread_attr_init(&attr); 886 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???"); 887 888 // Make sure we run in 1:1 kernel-user-thread mode. 889 if (os::Aix::on_aix()) { 890 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???"); 891 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???"); 892 } 893 894 // Start in suspended state, and in os::thread_start, wake the thread up. 895 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???"); 896 897 // Calculate stack size if it's not specified by caller. 898 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 899 900 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks) 901 // the real thread stack size may be smaller than the requested stack size, by as much as 64K. 902 // This very much looks like a pthread lib error. As a workaround, increase the stack size 903 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB) 904 if (stack_size < 4096 * K) { 905 stack_size += 64 * K; 906 } 907 908 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the 909 // thread size in attr unchanged. If this is the minimal stack size as set 910 // by pthread_attr_init this leads to crashes after thread creation. E.g. the 911 // guard pages might not fit on the tiny stack created. 912 int ret = pthread_attr_setstacksize(&attr, stack_size); 913 if (ret != 0) { 914 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k", 915 stack_size / K); 916 } 917 918 // Save some cycles and a page by disabling OS guard pages where we have our own 919 // VM guard pages (in java threads). For other threads, keep system default guard 920 // pages in place. 921 if (thr_type == java_thread || thr_type == compiler_thread) { 922 ret = pthread_attr_setguardsize(&attr, 0); 923 } 924 925 pthread_t tid = 0; 926 if (ret == 0) { 927 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread); 928 } 929 930 if (ret == 0) { 931 char buf[64]; 932 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ", 933 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 934 } else { 935 char buf[64]; 936 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.", 937 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr)); 938 } 939 940 pthread_attr_destroy(&attr); 941 942 if (ret != 0) { 943 // Need to clean up stuff we've allocated so far. 944 thread->set_osthread(NULL); 945 delete osthread; 946 return false; 947 } 948 949 // OSThread::thread_id is the pthread id. 950 osthread->set_thread_id(tid); 951 952 return true; 953 } 954 955 ///////////////////////////////////////////////////////////////////////////// 956 // attach existing thread 957 958 // bootstrap the main thread 959 bool os::create_main_thread(JavaThread* thread) { 960 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread"); 961 return create_attached_thread(thread); 962 } 963 964 bool os::create_attached_thread(JavaThread* thread) { 965 #ifdef ASSERT 966 thread->verify_not_published(); 967 #endif 968 969 // Allocate the OSThread object 970 OSThread* osthread = new OSThread(NULL, NULL); 971 972 if (osthread == NULL) { 973 return false; 974 } 975 976 const pthread_t pthread_id = ::pthread_self(); 977 const tid_t kernel_thread_id = ::thread_self(); 978 979 // OSThread::thread_id is the pthread id. 980 osthread->set_thread_id(pthread_id); 981 982 // .. but keep kernel thread id too for diagnostics 983 osthread->set_kernel_thread_id(kernel_thread_id); 984 985 // initialize floating point control register 986 os::Aix::init_thread_fpu_state(); 987 988 // Initial thread state is RUNNABLE 989 osthread->set_state(RUNNABLE); 990 991 thread->set_osthread(osthread); 992 993 if (UseNUMA) { 994 int lgrp_id = os::numa_get_group_id(); 995 if (lgrp_id != -1) { 996 thread->set_lgrp_id(lgrp_id); 997 } 998 } 999 1000 // initialize signal mask for this thread 1001 // and save the caller's signal mask 1002 os::Aix::hotspot_sigmask(thread); 1003 1004 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").", 1005 os::current_thread_id(), (uintx) kernel_thread_id); 1006 1007 return true; 1008 } 1009 1010 void os::pd_start_thread(Thread* thread) { 1011 int status = pthread_continue_np(thread->osthread()->pthread_id()); 1012 assert(status == 0, "thr_continue failed"); 1013 } 1014 1015 // Free OS resources related to the OSThread 1016 void os::free_thread(OSThread* osthread) { 1017 assert(osthread != NULL, "osthread not set"); 1018 1019 // We are told to free resources of the argument thread, 1020 // but we can only really operate on the current thread. 1021 assert(Thread::current()->osthread() == osthread, 1022 "os::free_thread but not current thread"); 1023 1024 // Restore caller's signal mask 1025 sigset_t sigmask = osthread->caller_sigmask(); 1026 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1027 1028 delete osthread; 1029 } 1030 1031 //////////////////////////////////////////////////////////////////////////////// 1032 // time support 1033 1034 // Time since start-up in seconds to a fine granularity. 1035 // Used by VMSelfDestructTimer and the MemProfiler. 1036 double os::elapsedTime() { 1037 return (double)(os::elapsed_counter()) * 0.000001; 1038 } 1039 1040 jlong os::elapsed_counter() { 1041 timeval time; 1042 int status = gettimeofday(&time, NULL); 1043 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count; 1044 } 1045 1046 jlong os::elapsed_frequency() { 1047 return (1000 * 1000); 1048 } 1049 1050 bool os::supports_vtime() { return true; } 1051 bool os::enable_vtime() { return false; } 1052 bool os::vtime_enabled() { return false; } 1053 1054 double os::elapsedVTime() { 1055 struct rusage usage; 1056 int retval = getrusage(RUSAGE_THREAD, &usage); 1057 if (retval == 0) { 1058 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000); 1059 } else { 1060 // better than nothing, but not much 1061 return elapsedTime(); 1062 } 1063 } 1064 1065 jlong os::javaTimeMillis() { 1066 timeval time; 1067 int status = gettimeofday(&time, NULL); 1068 assert(status != -1, "aix error at gettimeofday()"); 1069 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000); 1070 } 1071 1072 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1073 timeval time; 1074 int status = gettimeofday(&time, NULL); 1075 assert(status != -1, "aix error at gettimeofday()"); 1076 seconds = jlong(time.tv_sec); 1077 nanos = jlong(time.tv_usec) * 1000; 1078 } 1079 1080 // We use mread_real_time here. 1081 // On AIX: If the CPU has a time register, the result will be RTC_POWER and 1082 // it has to be converted to real time. AIX documentations suggests to do 1083 // this unconditionally, so we do it. 1084 // 1085 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm 1086 // 1087 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no 1088 // conversion is necessary. However, mread_real_time will not return 1089 // monotonic results but merely matches read_real_time. So we need a tweak 1090 // to ensure monotonic results. 1091 // 1092 // For PASE no public documentation exists, just word by IBM 1093 jlong os::javaTimeNanos() { 1094 timebasestruct_t time; 1095 int rc = mread_real_time(&time, TIMEBASE_SZ); 1096 if (os::Aix::on_pase()) { 1097 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE"); 1098 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1099 jlong prev = max_real_time; 1100 if (now <= prev) { 1101 return prev; // same or retrograde time; 1102 } 1103 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev); 1104 assert(obsv >= prev, "invariant"); // Monotonicity 1105 // If the CAS succeeded then we're done and return "now". 1106 // If the CAS failed and the observed value "obsv" is >= now then 1107 // we should return "obsv". If the CAS failed and now > obsv > prv then 1108 // some other thread raced this thread and installed a new value, in which case 1109 // we could either (a) retry the entire operation, (b) retry trying to install now 1110 // or (c) just return obsv. We use (c). No loop is required although in some cases 1111 // we might discard a higher "now" value in deference to a slightly lower but freshly 1112 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1113 // to (a) or (b) -- and greatly reduces coherence traffic. 1114 // We might also condition (c) on the magnitude of the delta between obsv and now. 1115 // Avoiding excessive CAS operations to hot RW locations is critical. 1116 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1117 return (prev == obsv) ? now : obsv; 1118 } else { 1119 if (rc != RTC_POWER) { 1120 rc = time_base_to_time(&time, TIMEBASE_SZ); 1121 assert(rc != -1, "error calling time_base_to_time()"); 1122 } 1123 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low); 1124 } 1125 } 1126 1127 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1128 info_ptr->max_value = ALL_64_BITS; 1129 // mread_real_time() is monotonic (see 'os::javaTimeNanos()') 1130 info_ptr->may_skip_backward = false; 1131 info_ptr->may_skip_forward = false; 1132 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1133 } 1134 1135 // Return the real, user, and system times in seconds from an 1136 // arbitrary fixed point in the past. 1137 bool os::getTimesSecs(double* process_real_time, 1138 double* process_user_time, 1139 double* process_system_time) { 1140 struct tms ticks; 1141 clock_t real_ticks = times(&ticks); 1142 1143 if (real_ticks == (clock_t) (-1)) { 1144 return false; 1145 } else { 1146 double ticks_per_second = (double) clock_tics_per_sec; 1147 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1148 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1149 *process_real_time = ((double) real_ticks) / ticks_per_second; 1150 1151 return true; 1152 } 1153 } 1154 1155 char * os::local_time_string(char *buf, size_t buflen) { 1156 struct tm t; 1157 time_t long_time; 1158 time(&long_time); 1159 localtime_r(&long_time, &t); 1160 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1161 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1162 t.tm_hour, t.tm_min, t.tm_sec); 1163 return buf; 1164 } 1165 1166 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 1167 return localtime_r(clock, res); 1168 } 1169 1170 //////////////////////////////////////////////////////////////////////////////// 1171 // runtime exit support 1172 1173 // Note: os::shutdown() might be called very early during initialization, or 1174 // called from signal handler. Before adding something to os::shutdown(), make 1175 // sure it is async-safe and can handle partially initialized VM. 1176 void os::shutdown() { 1177 1178 // allow PerfMemory to attempt cleanup of any persistent resources 1179 perfMemory_exit(); 1180 1181 // needs to remove object in file system 1182 AttachListener::abort(); 1183 1184 // flush buffered output, finish log files 1185 ostream_abort(); 1186 1187 // Check for abort hook 1188 abort_hook_t abort_hook = Arguments::abort_hook(); 1189 if (abort_hook != NULL) { 1190 abort_hook(); 1191 } 1192 } 1193 1194 // Note: os::abort() might be called very early during initialization, or 1195 // called from signal handler. Before adding something to os::abort(), make 1196 // sure it is async-safe and can handle partially initialized VM. 1197 void os::abort(bool dump_core, void* siginfo, const void* context) { 1198 os::shutdown(); 1199 if (dump_core) { 1200 #ifndef PRODUCT 1201 fdStream out(defaultStream::output_fd()); 1202 out.print_raw("Current thread is "); 1203 char buf[16]; 1204 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1205 out.print_raw_cr(buf); 1206 out.print_raw_cr("Dumping core ..."); 1207 #endif 1208 ::abort(); // dump core 1209 } 1210 1211 ::exit(1); 1212 } 1213 1214 // Die immediately, no exit hook, no abort hook, no cleanup. 1215 void os::die() { 1216 ::abort(); 1217 } 1218 1219 // This method is a copy of JDK's sysGetLastErrorString 1220 // from src/solaris/hpi/src/system_md.c 1221 1222 size_t os::lasterror(char *buf, size_t len) { 1223 if (errno == 0) return 0; 1224 1225 const char *s = os::strerror(errno); 1226 size_t n = ::strlen(s); 1227 if (n >= len) { 1228 n = len - 1; 1229 } 1230 ::strncpy(buf, s, n); 1231 buf[n] = '\0'; 1232 return n; 1233 } 1234 1235 intx os::current_thread_id() { 1236 return (intx)pthread_self(); 1237 } 1238 1239 int os::current_process_id() { 1240 return getpid(); 1241 } 1242 1243 // DLL functions 1244 1245 const char* os::dll_file_extension() { return ".so"; } 1246 1247 // This must be hard coded because it's the system's temporary 1248 // directory not the java application's temp directory, ala java.io.tmpdir. 1249 const char* os::get_temp_directory() { return "/tmp"; } 1250 1251 // Check if addr is inside libjvm.so. 1252 bool os::address_is_in_vm(address addr) { 1253 1254 // Input could be a real pc or a function pointer literal. The latter 1255 // would be a function descriptor residing in the data segment of a module. 1256 loaded_module_t lm; 1257 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) { 1258 return lm.is_in_vm; 1259 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 1260 return lm.is_in_vm; 1261 } else { 1262 return false; 1263 } 1264 1265 } 1266 1267 // Resolve an AIX function descriptor literal to a code pointer. 1268 // If the input is a valid code pointer to a text segment of a loaded module, 1269 // it is returned unchanged. 1270 // If the input is a valid AIX function descriptor, it is resolved to the 1271 // code entry point. 1272 // If the input is neither a valid function descriptor nor a valid code pointer, 1273 // NULL is returned. 1274 static address resolve_function_descriptor_to_code_pointer(address p) { 1275 1276 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) { 1277 // It is a real code pointer. 1278 return p; 1279 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) { 1280 // Pointer to data segment, potential function descriptor. 1281 address code_entry = (address)(((FunctionDescriptor*)p)->entry()); 1282 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) { 1283 // It is a function descriptor. 1284 return code_entry; 1285 } 1286 } 1287 1288 return NULL; 1289 } 1290 1291 bool os::dll_address_to_function_name(address addr, char *buf, 1292 int buflen, int *offset, 1293 bool demangle) { 1294 if (offset) { 1295 *offset = -1; 1296 } 1297 // Buf is not optional, but offset is optional. 1298 assert(buf != NULL, "sanity check"); 1299 buf[0] = '\0'; 1300 1301 // Resolve function ptr literals first. 1302 addr = resolve_function_descriptor_to_code_pointer(addr); 1303 if (!addr) { 1304 return false; 1305 } 1306 1307 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle); 1308 } 1309 1310 bool os::dll_address_to_library_name(address addr, char* buf, 1311 int buflen, int* offset) { 1312 if (offset) { 1313 *offset = -1; 1314 } 1315 // Buf is not optional, but offset is optional. 1316 assert(buf != NULL, "sanity check"); 1317 buf[0] = '\0'; 1318 1319 // Resolve function ptr literals first. 1320 addr = resolve_function_descriptor_to_code_pointer(addr); 1321 if (!addr) { 1322 return false; 1323 } 1324 1325 return AixSymbols::get_module_name(addr, buf, buflen); 1326 } 1327 1328 // Loads .dll/.so and in case of error it checks if .dll/.so was built 1329 // for the same architecture as Hotspot is running on. 1330 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1331 1332 if (ebuf && ebuflen > 0) { 1333 ebuf[0] = '\0'; 1334 ebuf[ebuflen - 1] = '\0'; 1335 } 1336 1337 if (!filename || strlen(filename) == 0) { 1338 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1); 1339 return NULL; 1340 } 1341 1342 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants. 1343 void * result= ::dlopen(filename, RTLD_LAZY); 1344 if (result != NULL) { 1345 // Reload dll cache. Don't do this in signal handling. 1346 LoadedLibraries::reload(); 1347 return result; 1348 } else { 1349 // error analysis when dlopen fails 1350 const char* const error_report = ::dlerror(); 1351 if (error_report && ebuf && ebuflen > 0) { 1352 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s", 1353 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report); 1354 } 1355 } 1356 return NULL; 1357 } 1358 1359 void* os::dll_lookup(void* handle, const char* name) { 1360 void* res = dlsym(handle, name); 1361 return res; 1362 } 1363 1364 void* os::get_default_process_handle() { 1365 return (void*)::dlopen(NULL, RTLD_LAZY); 1366 } 1367 1368 void os::print_dll_info(outputStream *st) { 1369 st->print_cr("Dynamic libraries:"); 1370 LoadedLibraries::print(st); 1371 } 1372 1373 void os::get_summary_os_info(char* buf, size_t buflen) { 1374 // There might be something more readable than uname results for AIX. 1375 struct utsname name; 1376 uname(&name); 1377 snprintf(buf, buflen, "%s %s", name.release, name.version); 1378 } 1379 1380 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1381 // Not yet implemented. 1382 return 0; 1383 } 1384 1385 void os::print_os_info_brief(outputStream* st) { 1386 uint32_t ver = os::Aix::os_version(); 1387 st->print_cr("AIX kernel version %u.%u.%u.%u", 1388 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1389 1390 os::Posix::print_uname_info(st); 1391 1392 // Linux uses print_libversion_info(st); here. 1393 } 1394 1395 void os::print_os_info(outputStream* st) { 1396 st->print("OS:"); 1397 1398 st->print("uname:"); 1399 struct utsname name; 1400 uname(&name); 1401 st->print(name.sysname); st->print(" "); 1402 st->print(name.nodename); st->print(" "); 1403 st->print(name.release); st->print(" "); 1404 st->print(name.version); st->print(" "); 1405 st->print(name.machine); 1406 st->cr(); 1407 1408 uint32_t ver = os::Aix::os_version(); 1409 st->print_cr("AIX kernel version %u.%u.%u.%u", 1410 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF); 1411 1412 os::Posix::print_rlimit_info(st); 1413 1414 // load average 1415 st->print("load average:"); 1416 double loadavg[3] = {-1.L, -1.L, -1.L}; 1417 os::loadavg(loadavg, 3); 1418 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 1419 st->cr(); 1420 1421 // print wpar info 1422 libperfstat::wparinfo_t wi; 1423 if (libperfstat::get_wparinfo(&wi)) { 1424 st->print_cr("wpar info"); 1425 st->print_cr("name: %s", wi.name); 1426 st->print_cr("id: %d", wi.wpar_id); 1427 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system")); 1428 } 1429 1430 // print partition info 1431 libperfstat::partitioninfo_t pi; 1432 if (libperfstat::get_partitioninfo(&pi)) { 1433 st->print_cr("partition info"); 1434 st->print_cr(" name: %s", pi.name); 1435 } 1436 1437 } 1438 1439 void os::print_memory_info(outputStream* st) { 1440 1441 st->print_cr("Memory:"); 1442 1443 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s", 1444 describe_pagesize(g_multipage_support.pagesize)); 1445 st->print_cr(" Data page size (C-Heap, bss, etc): %s", 1446 describe_pagesize(g_multipage_support.datapsize)); 1447 st->print_cr(" Text page size: %s", 1448 describe_pagesize(g_multipage_support.textpsize)); 1449 st->print_cr(" Thread stack page size (pthread): %s", 1450 describe_pagesize(g_multipage_support.pthr_stack_pagesize)); 1451 st->print_cr(" Default shared memory page size: %s", 1452 describe_pagesize(g_multipage_support.shmpsize)); 1453 st->print_cr(" Can use 64K pages dynamically with shared meory: %s", 1454 (g_multipage_support.can_use_64K_pages ? "yes" :"no")); 1455 st->print_cr(" Can use 16M pages dynamically with shared memory: %s", 1456 (g_multipage_support.can_use_16M_pages ? "yes" :"no")); 1457 st->print_cr(" Multipage error: %d", 1458 g_multipage_support.error); 1459 st->cr(); 1460 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size())); 1461 1462 // print out LDR_CNTRL because it affects the default page sizes 1463 const char* const ldr_cntrl = ::getenv("LDR_CNTRL"); 1464 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>"); 1465 1466 // Print out EXTSHM because it is an unsupported setting. 1467 const char* const extshm = ::getenv("EXTSHM"); 1468 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>"); 1469 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) { 1470 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***"); 1471 } 1472 1473 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks. 1474 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES"); 1475 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.", 1476 aixthread_guardpages ? aixthread_guardpages : "<unset>"); 1477 st->cr(); 1478 1479 os::Aix::meminfo_t mi; 1480 if (os::Aix::get_meminfo(&mi)) { 1481 if (os::Aix::on_aix()) { 1482 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1483 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free); 1484 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total); 1485 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free); 1486 } else { 1487 // PASE - Numbers are result of QWCRSSTS; they mean: 1488 // real_total: Sum of all system pools 1489 // real_free: always 0 1490 // pgsp_total: we take the size of the system ASP 1491 // pgsp_free: size of system ASP times percentage of system ASP unused 1492 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total); 1493 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total); 1494 st->print_cr("%% system asp used : %.2f", 1495 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f); 1496 } 1497 } 1498 st->cr(); 1499 1500 // Print program break. 1501 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup)); 1502 address brk_now = (address)::sbrk(0); 1503 if (brk_now != (address)-1) { 1504 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).", 1505 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K)); 1506 } 1507 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K); 1508 st->cr(); 1509 1510 // Print segments allocated with os::reserve_memory. 1511 st->print_cr("internal virtual memory regions used by vm:"); 1512 vmembk_print_on(st); 1513 } 1514 1515 // Get a string for the cpuinfo that is a summary of the cpu type 1516 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1517 // read _system_configuration.version 1518 switch (_system_configuration.version) { 1519 case PV_8: 1520 strncpy(buf, "Power PC 8", buflen); 1521 break; 1522 case PV_7: 1523 strncpy(buf, "Power PC 7", buflen); 1524 break; 1525 case PV_6_1: 1526 strncpy(buf, "Power PC 6 DD1.x", buflen); 1527 break; 1528 case PV_6: 1529 strncpy(buf, "Power PC 6", buflen); 1530 break; 1531 case PV_5: 1532 strncpy(buf, "Power PC 5", buflen); 1533 break; 1534 case PV_5_2: 1535 strncpy(buf, "Power PC 5_2", buflen); 1536 break; 1537 case PV_5_3: 1538 strncpy(buf, "Power PC 5_3", buflen); 1539 break; 1540 case PV_5_Compat: 1541 strncpy(buf, "PV_5_Compat", buflen); 1542 break; 1543 case PV_6_Compat: 1544 strncpy(buf, "PV_6_Compat", buflen); 1545 break; 1546 case PV_7_Compat: 1547 strncpy(buf, "PV_7_Compat", buflen); 1548 break; 1549 case PV_8_Compat: 1550 strncpy(buf, "PV_8_Compat", buflen); 1551 break; 1552 default: 1553 strncpy(buf, "unknown", buflen); 1554 } 1555 } 1556 1557 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1558 // Nothing to do beyond of what os::print_cpu_info() does. 1559 } 1560 1561 static void print_signal_handler(outputStream* st, int sig, 1562 char* buf, size_t buflen); 1563 1564 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1565 st->print_cr("Signal Handlers:"); 1566 print_signal_handler(st, SIGSEGV, buf, buflen); 1567 print_signal_handler(st, SIGBUS , buf, buflen); 1568 print_signal_handler(st, SIGFPE , buf, buflen); 1569 print_signal_handler(st, SIGPIPE, buf, buflen); 1570 print_signal_handler(st, SIGXFSZ, buf, buflen); 1571 print_signal_handler(st, SIGILL , buf, buflen); 1572 print_signal_handler(st, SR_signum, buf, buflen); 1573 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen); 1574 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1575 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen); 1576 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1577 print_signal_handler(st, SIGTRAP, buf, buflen); 1578 // We also want to know if someone else adds a SIGDANGER handler because 1579 // that will interfere with OOM killling. 1580 print_signal_handler(st, SIGDANGER, buf, buflen); 1581 } 1582 1583 static char saved_jvm_path[MAXPATHLEN] = {0}; 1584 1585 // Find the full path to the current module, libjvm.so. 1586 void os::jvm_path(char *buf, jint buflen) { 1587 // Error checking. 1588 if (buflen < MAXPATHLEN) { 1589 assert(false, "must use a large-enough buffer"); 1590 buf[0] = '\0'; 1591 return; 1592 } 1593 // Lazy resolve the path to current module. 1594 if (saved_jvm_path[0] != 0) { 1595 strcpy(buf, saved_jvm_path); 1596 return; 1597 } 1598 1599 Dl_info dlinfo; 1600 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1601 assert(ret != 0, "cannot locate libjvm"); 1602 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1603 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?"); 1604 1605 if (Arguments::sun_java_launcher_is_altjvm()) { 1606 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1607 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so". 1608 // If "/jre/lib/" appears at the right place in the string, then 1609 // assume we are installed in a JDK and we're done. Otherwise, check 1610 // for a JAVA_HOME environment variable and fix up the path so it 1611 // looks like libjvm.so is installed there (append a fake suffix 1612 // hotspot/libjvm.so). 1613 const char *p = buf + strlen(buf) - 1; 1614 for (int count = 0; p > buf && count < 4; ++count) { 1615 for (--p; p > buf && *p != '/'; --p) 1616 /* empty */ ; 1617 } 1618 1619 if (strncmp(p, "/jre/lib/", 9) != 0) { 1620 // Look for JAVA_HOME in the environment. 1621 char* java_home_var = ::getenv("JAVA_HOME"); 1622 if (java_home_var != NULL && java_home_var[0] != 0) { 1623 char* jrelib_p; 1624 int len; 1625 1626 // Check the current module name "libjvm.so". 1627 p = strrchr(buf, '/'); 1628 if (p == NULL) { 1629 return; 1630 } 1631 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1632 1633 rp = os::Posix::realpath(java_home_var, buf, buflen); 1634 if (rp == NULL) { 1635 return; 1636 } 1637 1638 // determine if this is a legacy image or modules image 1639 // modules image doesn't have "jre" subdirectory 1640 len = strlen(buf); 1641 assert(len < buflen, "Ran out of buffer room"); 1642 jrelib_p = buf + len; 1643 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1644 if (0 != access(buf, F_OK)) { 1645 snprintf(jrelib_p, buflen-len, "/lib"); 1646 } 1647 1648 if (0 == access(buf, F_OK)) { 1649 // Use current module name "libjvm.so" 1650 len = strlen(buf); 1651 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1652 } else { 1653 // Go back to path of .so 1654 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen); 1655 if (rp == NULL) { 1656 return; 1657 } 1658 } 1659 } 1660 } 1661 } 1662 1663 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path)); 1664 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0'; 1665 } 1666 1667 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1668 // no prefix required, not even "_" 1669 } 1670 1671 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1672 // no suffix required 1673 } 1674 1675 //////////////////////////////////////////////////////////////////////////////// 1676 // sun.misc.Signal support 1677 1678 static volatile jint sigint_count = 0; 1679 1680 static void 1681 UserHandler(int sig, void *siginfo, void *context) { 1682 // 4511530 - sem_post is serialized and handled by the manager thread. When 1683 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We 1684 // don't want to flood the manager thread with sem_post requests. 1685 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1) 1686 return; 1687 1688 // Ctrl-C is pressed during error reporting, likely because the error 1689 // handler fails to abort. Let VM die immediately. 1690 if (sig == SIGINT && VMError::is_error_reported()) { 1691 os::die(); 1692 } 1693 1694 os::signal_notify(sig); 1695 } 1696 1697 void* os::user_handler() { 1698 return CAST_FROM_FN_PTR(void*, UserHandler); 1699 } 1700 1701 extern "C" { 1702 typedef void (*sa_handler_t)(int); 1703 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1704 } 1705 1706 void* os::signal(int signal_number, void* handler) { 1707 struct sigaction sigAct, oldSigAct; 1708 1709 sigfillset(&(sigAct.sa_mask)); 1710 1711 // Do not block out synchronous signals in the signal handler. 1712 // Blocking synchronous signals only makes sense if you can really 1713 // be sure that those signals won't happen during signal handling, 1714 // when the blocking applies. Normal signal handlers are lean and 1715 // do not cause signals. But our signal handlers tend to be "risky" 1716 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen. 1717 // On AIX, PASE there was a case where a SIGSEGV happened, followed 1718 // by a SIGILL, which was blocked due to the signal mask. The process 1719 // just hung forever. Better to crash from a secondary signal than to hang. 1720 sigdelset(&(sigAct.sa_mask), SIGSEGV); 1721 sigdelset(&(sigAct.sa_mask), SIGBUS); 1722 sigdelset(&(sigAct.sa_mask), SIGILL); 1723 sigdelset(&(sigAct.sa_mask), SIGFPE); 1724 sigdelset(&(sigAct.sa_mask), SIGTRAP); 1725 1726 sigAct.sa_flags = SA_RESTART|SA_SIGINFO; 1727 1728 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1729 1730 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1731 // -1 means registration failed 1732 return (void *)-1; 1733 } 1734 1735 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1736 } 1737 1738 void os::signal_raise(int signal_number) { 1739 ::raise(signal_number); 1740 } 1741 1742 // 1743 // The following code is moved from os.cpp for making this 1744 // code platform specific, which it is by its very nature. 1745 // 1746 1747 // Will be modified when max signal is changed to be dynamic 1748 int os::sigexitnum_pd() { 1749 return NSIG; 1750 } 1751 1752 // a counter for each possible signal value 1753 static volatile jint pending_signals[NSIG+1] = { 0 }; 1754 1755 // Wrapper functions for: sem_init(), sem_post(), sem_wait() 1756 // On AIX, we use sem_init(), sem_post(), sem_wait() 1757 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores 1758 // do not seem to work at all on PASE (unimplemented, will cause SIGILL). 1759 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as 1760 // on AIX, msem_..() calls are suspected of causing problems. 1761 static sem_t sig_sem; 1762 static msemaphore* p_sig_msem = 0; 1763 1764 static void local_sem_init() { 1765 if (os::Aix::on_aix()) { 1766 int rc = ::sem_init(&sig_sem, 0, 0); 1767 guarantee(rc != -1, "sem_init failed"); 1768 } else { 1769 // Memory semaphores must live in shared mem. 1770 guarantee0(p_sig_msem == NULL); 1771 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL); 1772 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore"); 1773 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed"); 1774 } 1775 } 1776 1777 static void local_sem_post() { 1778 static bool warn_only_once = false; 1779 if (os::Aix::on_aix()) { 1780 int rc = ::sem_post(&sig_sem); 1781 if (rc == -1 && !warn_only_once) { 1782 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno)); 1783 warn_only_once = true; 1784 } 1785 } else { 1786 guarantee0(p_sig_msem != NULL); 1787 int rc = ::msem_unlock(p_sig_msem, 0); 1788 if (rc == -1 && !warn_only_once) { 1789 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1790 warn_only_once = true; 1791 } 1792 } 1793 } 1794 1795 static void local_sem_wait() { 1796 static bool warn_only_once = false; 1797 if (os::Aix::on_aix()) { 1798 int rc = ::sem_wait(&sig_sem); 1799 if (rc == -1 && !warn_only_once) { 1800 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno)); 1801 warn_only_once = true; 1802 } 1803 } else { 1804 guarantee0(p_sig_msem != NULL); // must init before use 1805 int rc = ::msem_lock(p_sig_msem, 0); 1806 if (rc == -1 && !warn_only_once) { 1807 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno)); 1808 warn_only_once = true; 1809 } 1810 } 1811 } 1812 1813 void os::signal_init_pd() { 1814 // Initialize signal structures 1815 ::memset((void*)pending_signals, 0, sizeof(pending_signals)); 1816 1817 // Initialize signal semaphore 1818 local_sem_init(); 1819 } 1820 1821 void os::signal_notify(int sig) { 1822 Atomic::inc(&pending_signals[sig]); 1823 local_sem_post(); 1824 } 1825 1826 static int check_pending_signals() { 1827 Atomic::store(0, &sigint_count); 1828 for (;;) { 1829 for (int i = 0; i < NSIG + 1; i++) { 1830 jint n = pending_signals[i]; 1831 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1832 return i; 1833 } 1834 } 1835 JavaThread *thread = JavaThread::current(); 1836 ThreadBlockInVM tbivm(thread); 1837 1838 bool threadIsSuspended; 1839 do { 1840 thread->set_suspend_equivalent(); 1841 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 1842 1843 local_sem_wait(); 1844 1845 // were we externally suspended while we were waiting? 1846 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1847 if (threadIsSuspended) { 1848 // 1849 // The semaphore has been incremented, but while we were waiting 1850 // another thread suspended us. We don't want to continue running 1851 // while suspended because that would surprise the thread that 1852 // suspended us. 1853 // 1854 1855 local_sem_post(); 1856 1857 thread->java_suspend_self(); 1858 } 1859 } while (threadIsSuspended); 1860 } 1861 } 1862 1863 int os::signal_wait() { 1864 return check_pending_signals(); 1865 } 1866 1867 //////////////////////////////////////////////////////////////////////////////// 1868 // Virtual Memory 1869 1870 // We need to keep small simple bookkeeping for os::reserve_memory and friends. 1871 1872 #define VMEM_MAPPED 1 1873 #define VMEM_SHMATED 2 1874 1875 struct vmembk_t { 1876 int type; // 1 - mmap, 2 - shmat 1877 char* addr; 1878 size_t size; // Real size, may be larger than usersize. 1879 size_t pagesize; // page size of area 1880 vmembk_t* next; 1881 1882 bool contains_addr(char* p) const { 1883 return p >= addr && p < (addr + size); 1884 } 1885 1886 bool contains_range(char* p, size_t s) const { 1887 return contains_addr(p) && contains_addr(p + s - 1); 1888 } 1889 1890 void print_on(outputStream* os) const { 1891 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT 1892 " bytes, %d %s pages), %s", 1893 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize), 1894 (type == VMEM_SHMATED ? "shmat" : "mmap") 1895 ); 1896 } 1897 1898 // Check that range is a sub range of memory block (or equal to memory block); 1899 // also check that range is fully page aligned to the page size if the block. 1900 void assert_is_valid_subrange(char* p, size_t s) const { 1901 if (!contains_range(p, s)) { 1902 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub " 1903 "range of [" PTR_FORMAT " - " PTR_FORMAT "].", 1904 p, p + s, addr, addr + size); 1905 guarantee0(false); 1906 } 1907 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) { 1908 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not" 1909 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize); 1910 guarantee0(false); 1911 } 1912 } 1913 }; 1914 1915 static struct { 1916 vmembk_t* first; 1917 MiscUtils::CritSect cs; 1918 } vmem; 1919 1920 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) { 1921 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t)); 1922 assert0(p); 1923 if (p) { 1924 MiscUtils::AutoCritSect lck(&vmem.cs); 1925 p->addr = addr; p->size = size; 1926 p->pagesize = pagesize; 1927 p->type = type; 1928 p->next = vmem.first; 1929 vmem.first = p; 1930 } 1931 } 1932 1933 static vmembk_t* vmembk_find(char* addr) { 1934 MiscUtils::AutoCritSect lck(&vmem.cs); 1935 for (vmembk_t* p = vmem.first; p; p = p->next) { 1936 if (p->addr <= addr && (p->addr + p->size) > addr) { 1937 return p; 1938 } 1939 } 1940 return NULL; 1941 } 1942 1943 static void vmembk_remove(vmembk_t* p0) { 1944 MiscUtils::AutoCritSect lck(&vmem.cs); 1945 assert0(p0); 1946 assert0(vmem.first); // List should not be empty. 1947 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) { 1948 if (*pp == p0) { 1949 *pp = p0->next; 1950 ::free(p0); 1951 return; 1952 } 1953 } 1954 assert0(false); // Not found? 1955 } 1956 1957 static void vmembk_print_on(outputStream* os) { 1958 MiscUtils::AutoCritSect lck(&vmem.cs); 1959 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) { 1960 vmi->print_on(os); 1961 os->cr(); 1962 } 1963 } 1964 1965 // Reserve and attach a section of System V memory. 1966 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given 1967 // address. Failing that, it will attach the memory anywhere. 1968 // If <requested_addr> is NULL, function will attach the memory anywhere. 1969 // 1970 // <alignment_hint> is being ignored by this function. It is very probable however that the 1971 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries. 1972 // Should this be not enogh, we can put more work into it. 1973 static char* reserve_shmated_memory ( 1974 size_t bytes, 1975 char* requested_addr, 1976 size_t alignment_hint) { 1977 1978 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress " 1979 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...", 1980 bytes, requested_addr, alignment_hint); 1981 1982 // Either give me wish address or wish alignment but not both. 1983 assert0(!(requested_addr != NULL && alignment_hint != 0)); 1984 1985 // We must prevent anyone from attaching too close to the 1986 // BRK because that may cause malloc OOM. 1987 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 1988 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 1989 "Will attach anywhere.", requested_addr); 1990 // Act like the OS refused to attach there. 1991 requested_addr = NULL; 1992 } 1993 1994 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not 1995 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead. 1996 if (os::Aix::on_pase_V5R4_or_older()) { 1997 ShouldNotReachHere(); 1998 } 1999 2000 // Align size of shm up to 64K to avoid errors if we later try to change the page size. 2001 const size_t size = align_up(bytes, 64*K); 2002 2003 // Reserve the shared segment. 2004 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR); 2005 if (shmid == -1) { 2006 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno); 2007 return NULL; 2008 } 2009 2010 // Important note: 2011 // It is very important that we, upon leaving this function, do not leave a shm segment alive. 2012 // We must right after attaching it remove it from the system. System V shm segments are global and 2013 // survive the process. 2014 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A). 2015 2016 struct shmid_ds shmbuf; 2017 memset(&shmbuf, 0, sizeof(shmbuf)); 2018 shmbuf.shm_pagesize = 64*K; 2019 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) { 2020 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.", 2021 size / (64*K), errno); 2022 // I want to know if this ever happens. 2023 assert(false, "failed to set page size for shmat"); 2024 } 2025 2026 // Now attach the shared segment. 2027 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if 2028 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address 2029 // were not a segment boundary. 2030 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND); 2031 const int errno_shmat = errno; 2032 2033 // (A) Right after shmat and before handing shmat errors delete the shm segment. 2034 if (::shmctl(shmid, IPC_RMID, NULL) == -1) { 2035 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno); 2036 assert(false, "failed to remove shared memory segment!"); 2037 } 2038 2039 // Handle shmat error. If we failed to attach, just return. 2040 if (addr == (char*)-1) { 2041 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat); 2042 return NULL; 2043 } 2044 2045 // Just for info: query the real page size. In case setting the page size did not 2046 // work (see above), the system may have given us something other then 4K (LDR_CNTRL). 2047 const size_t real_pagesize = os::Aix::query_pagesize(addr); 2048 if (real_pagesize != shmbuf.shm_pagesize) { 2049 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize); 2050 } 2051 2052 if (addr) { 2053 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)", 2054 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize)); 2055 } else { 2056 if (requested_addr != NULL) { 2057 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr); 2058 } else { 2059 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size); 2060 } 2061 } 2062 2063 // book-keeping 2064 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED); 2065 assert0(is_aligned_to(addr, os::vm_page_size())); 2066 2067 return addr; 2068 } 2069 2070 static bool release_shmated_memory(char* addr, size_t size) { 2071 2072 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2073 addr, addr + size - 1); 2074 2075 bool rc = false; 2076 2077 // TODO: is there a way to verify shm size without doing bookkeeping? 2078 if (::shmdt(addr) != 0) { 2079 trcVerbose("error (%d).", errno); 2080 } else { 2081 trcVerbose("ok."); 2082 rc = true; 2083 } 2084 return rc; 2085 } 2086 2087 static bool uncommit_shmated_memory(char* addr, size_t size) { 2088 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2089 addr, addr + size - 1); 2090 2091 const bool rc = my_disclaim64(addr, size); 2092 2093 if (!rc) { 2094 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size); 2095 return false; 2096 } 2097 return true; 2098 } 2099 2100 //////////////////////////////// mmap-based routines ///////////////////////////////// 2101 2102 // Reserve memory via mmap. 2103 // If <requested_addr> is given, an attempt is made to attach at the given address. 2104 // Failing that, memory is allocated at any address. 2105 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to 2106 // allocate at an address aligned with the given alignment. Failing that, memory 2107 // is aligned anywhere. 2108 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2109 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", " 2110 "alignment_hint " UINTX_FORMAT "...", 2111 bytes, requested_addr, alignment_hint); 2112 2113 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail. 2114 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) { 2115 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr); 2116 return NULL; 2117 } 2118 2119 // We must prevent anyone from attaching too close to the 2120 // BRK because that may cause malloc OOM. 2121 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) { 2122 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. " 2123 "Will attach anywhere.", requested_addr); 2124 // Act like the OS refused to attach there. 2125 requested_addr = NULL; 2126 } 2127 2128 // Specify one or the other but not both. 2129 assert0(!(requested_addr != NULL && alignment_hint > 0)); 2130 2131 // In 64K mode, we claim the global page size (os::vm_page_size()) 2132 // is 64K. This is one of the few points where that illusion may 2133 // break, because mmap() will always return memory aligned to 4K. So 2134 // we must ensure we only ever return memory aligned to 64k. 2135 if (alignment_hint) { 2136 alignment_hint = lcm(alignment_hint, os::vm_page_size()); 2137 } else { 2138 alignment_hint = os::vm_page_size(); 2139 } 2140 2141 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode). 2142 const size_t size = align_up(bytes, os::vm_page_size()); 2143 2144 // alignment: Allocate memory large enough to include an aligned range of the right size and 2145 // cut off the leading and trailing waste pages. 2146 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above 2147 const size_t extra_size = size + alignment_hint; 2148 2149 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to 2150 // later use msync(MS_INVALIDATE) (see os::uncommit_memory). 2151 int flags = MAP_ANONYMOUS | MAP_SHARED; 2152 2153 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what 2154 // it means if wishaddress is given but MAP_FIXED is not set. 2155 // 2156 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not. 2157 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings. 2158 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will 2159 // get clobbered. 2160 if (requested_addr != NULL) { 2161 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour 2162 flags |= MAP_FIXED; 2163 } 2164 } 2165 2166 char* addr = (char*)::mmap(requested_addr, extra_size, 2167 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0); 2168 2169 if (addr == MAP_FAILED) { 2170 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno); 2171 return NULL; 2172 } 2173 2174 // Handle alignment. 2175 char* const addr_aligned = align_up(addr, alignment_hint); 2176 const size_t waste_pre = addr_aligned - addr; 2177 char* const addr_aligned_end = addr_aligned + size; 2178 const size_t waste_post = extra_size - waste_pre - size; 2179 if (waste_pre > 0) { 2180 ::munmap(addr, waste_pre); 2181 } 2182 if (waste_post > 0) { 2183 ::munmap(addr_aligned_end, waste_post); 2184 } 2185 addr = addr_aligned; 2186 2187 if (addr) { 2188 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)", 2189 addr, addr + bytes, bytes); 2190 } else { 2191 if (requested_addr != NULL) { 2192 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr); 2193 } else { 2194 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes); 2195 } 2196 } 2197 2198 // bookkeeping 2199 vmembk_add(addr, size, 4*K, VMEM_MAPPED); 2200 2201 // Test alignment, see above. 2202 assert0(is_aligned_to(addr, os::vm_page_size())); 2203 2204 return addr; 2205 } 2206 2207 static bool release_mmaped_memory(char* addr, size_t size) { 2208 assert0(is_aligned_to(addr, os::vm_page_size())); 2209 assert0(is_aligned_to(size, os::vm_page_size())); 2210 2211 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2212 addr, addr + size - 1); 2213 bool rc = false; 2214 2215 if (::munmap(addr, size) != 0) { 2216 trcVerbose("failed (%d)\n", errno); 2217 rc = false; 2218 } else { 2219 trcVerbose("ok."); 2220 rc = true; 2221 } 2222 2223 return rc; 2224 } 2225 2226 static bool uncommit_mmaped_memory(char* addr, size_t size) { 2227 2228 assert0(is_aligned_to(addr, os::vm_page_size())); 2229 assert0(is_aligned_to(size, os::vm_page_size())); 2230 2231 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].", 2232 addr, addr + size - 1); 2233 bool rc = false; 2234 2235 // Uncommit mmap memory with msync MS_INVALIDATE. 2236 if (::msync(addr, size, MS_INVALIDATE) != 0) { 2237 trcVerbose("failed (%d)\n", errno); 2238 rc = false; 2239 } else { 2240 trcVerbose("ok."); 2241 rc = true; 2242 } 2243 2244 return rc; 2245 } 2246 2247 int os::vm_page_size() { 2248 // Seems redundant as all get out. 2249 assert(os::Aix::page_size() != -1, "must call os::init"); 2250 return os::Aix::page_size(); 2251 } 2252 2253 // Aix allocates memory by pages. 2254 int os::vm_allocation_granularity() { 2255 assert(os::Aix::page_size() != -1, "must call os::init"); 2256 return os::Aix::page_size(); 2257 } 2258 2259 #ifdef PRODUCT 2260 static void warn_fail_commit_memory(char* addr, size_t size, bool exec, 2261 int err) { 2262 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2263 ", %d) failed; error='%s' (errno=%d)", addr, size, exec, 2264 os::errno_name(err), err); 2265 } 2266 #endif 2267 2268 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec, 2269 const char* mesg) { 2270 assert(mesg != NULL, "mesg must be specified"); 2271 if (!pd_commit_memory(addr, size, exec)) { 2272 // Add extra info in product mode for vm_exit_out_of_memory(): 2273 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);) 2274 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg); 2275 } 2276 } 2277 2278 bool os::pd_commit_memory(char* addr, size_t size, bool exec) { 2279 2280 assert(is_aligned_to(addr, os::vm_page_size()), 2281 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2282 p2i(addr), os::vm_page_size()); 2283 assert(is_aligned_to(size, os::vm_page_size()), 2284 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2285 size, os::vm_page_size()); 2286 2287 vmembk_t* const vmi = vmembk_find(addr); 2288 guarantee0(vmi); 2289 vmi->assert_is_valid_subrange(addr, size); 2290 2291 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1); 2292 2293 if (UseExplicitCommit) { 2294 // AIX commits memory on touch. So, touch all pages to be committed. 2295 for (char* p = addr; p < (addr + size); p += 4*K) { 2296 *p = '\0'; 2297 } 2298 } 2299 2300 return true; 2301 } 2302 2303 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) { 2304 return pd_commit_memory(addr, size, exec); 2305 } 2306 2307 void os::pd_commit_memory_or_exit(char* addr, size_t size, 2308 size_t alignment_hint, bool exec, 2309 const char* mesg) { 2310 // Alignment_hint is ignored on this OS. 2311 pd_commit_memory_or_exit(addr, size, exec, mesg); 2312 } 2313 2314 bool os::pd_uncommit_memory(char* addr, size_t size) { 2315 assert(is_aligned_to(addr, os::vm_page_size()), 2316 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2317 p2i(addr), os::vm_page_size()); 2318 assert(is_aligned_to(size, os::vm_page_size()), 2319 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")", 2320 size, os::vm_page_size()); 2321 2322 // Dynamically do different things for mmap/shmat. 2323 const vmembk_t* const vmi = vmembk_find(addr); 2324 guarantee0(vmi); 2325 vmi->assert_is_valid_subrange(addr, size); 2326 2327 if (vmi->type == VMEM_SHMATED) { 2328 return uncommit_shmated_memory(addr, size); 2329 } else { 2330 return uncommit_mmaped_memory(addr, size); 2331 } 2332 } 2333 2334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2335 // Do not call this; no need to commit stack pages on AIX. 2336 ShouldNotReachHere(); 2337 return true; 2338 } 2339 2340 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2341 // Do not call this; no need to commit stack pages on AIX. 2342 ShouldNotReachHere(); 2343 return true; 2344 } 2345 2346 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2347 } 2348 2349 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) { 2350 } 2351 2352 void os::numa_make_global(char *addr, size_t bytes) { 2353 } 2354 2355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2356 } 2357 2358 bool os::numa_topology_changed() { 2359 return false; 2360 } 2361 2362 size_t os::numa_get_groups_num() { 2363 return 1; 2364 } 2365 2366 int os::numa_get_group_id() { 2367 return 0; 2368 } 2369 2370 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2371 if (size > 0) { 2372 ids[0] = 0; 2373 return 1; 2374 } 2375 return 0; 2376 } 2377 2378 bool os::get_page_info(char *start, page_info* info) { 2379 return false; 2380 } 2381 2382 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2383 return end; 2384 } 2385 2386 // Reserves and attaches a shared memory segment. 2387 // Will assert if a wish address is given and could not be obtained. 2388 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2389 2390 // All other Unices do a mmap(MAP_FIXED) if the addr is given, 2391 // thereby clobbering old mappings at that place. That is probably 2392 // not intended, never used and almost certainly an error were it 2393 // ever be used this way (to try attaching at a specified address 2394 // without clobbering old mappings an alternate API exists, 2395 // os::attempt_reserve_memory_at()). 2396 // Instead of mimicking the dangerous coding of the other platforms, here I 2397 // just ignore the request address (release) or assert(debug). 2398 assert0(requested_addr == NULL); 2399 2400 // Always round to os::vm_page_size(), which may be larger than 4K. 2401 bytes = align_up(bytes, os::vm_page_size()); 2402 const size_t alignment_hint0 = 2403 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0; 2404 2405 // In 4K mode always use mmap. 2406 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2407 if (os::vm_page_size() == 4*K) { 2408 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2409 } else { 2410 if (bytes >= Use64KPagesThreshold) { 2411 return reserve_shmated_memory(bytes, requested_addr, alignment_hint); 2412 } else { 2413 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint); 2414 } 2415 } 2416 } 2417 2418 bool os::pd_release_memory(char* addr, size_t size) { 2419 2420 // Dynamically do different things for mmap/shmat. 2421 vmembk_t* const vmi = vmembk_find(addr); 2422 guarantee0(vmi); 2423 2424 // Always round to os::vm_page_size(), which may be larger than 4K. 2425 size = align_up(size, os::vm_page_size()); 2426 addr = align_up(addr, os::vm_page_size()); 2427 2428 bool rc = false; 2429 bool remove_bookkeeping = false; 2430 if (vmi->type == VMEM_SHMATED) { 2431 // For shmatted memory, we do: 2432 // - If user wants to release the whole range, release the memory (shmdt). 2433 // - If user only wants to release a partial range, uncommit (disclaim) that 2434 // range. That way, at least, we do not use memory anymore (bust still page 2435 // table space). 2436 vmi->assert_is_valid_subrange(addr, size); 2437 if (addr == vmi->addr && size == vmi->size) { 2438 rc = release_shmated_memory(addr, size); 2439 remove_bookkeeping = true; 2440 } else { 2441 rc = uncommit_shmated_memory(addr, size); 2442 } 2443 } else { 2444 // User may unmap partial regions but region has to be fully contained. 2445 #ifdef ASSERT 2446 vmi->assert_is_valid_subrange(addr, size); 2447 #endif 2448 rc = release_mmaped_memory(addr, size); 2449 remove_bookkeeping = true; 2450 } 2451 2452 // update bookkeeping 2453 if (rc && remove_bookkeeping) { 2454 vmembk_remove(vmi); 2455 } 2456 2457 return rc; 2458 } 2459 2460 static bool checked_mprotect(char* addr, size_t size, int prot) { 2461 2462 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will 2463 // not tell me if protection failed when trying to protect an un-protectable range. 2464 // 2465 // This means if the memory was allocated using shmget/shmat, protection wont work 2466 // but mprotect will still return 0: 2467 // 2468 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm 2469 2470 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false; 2471 2472 if (!rc) { 2473 const char* const s_errno = os::errno_name(errno); 2474 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno); 2475 return false; 2476 } 2477 2478 // mprotect success check 2479 // 2480 // Mprotect said it changed the protection but can I believe it? 2481 // 2482 // To be sure I need to check the protection afterwards. Try to 2483 // read from protected memory and check whether that causes a segfault. 2484 // 2485 if (!os::Aix::xpg_sus_mode()) { 2486 2487 if (CanUseSafeFetch32()) { 2488 2489 const bool read_protected = 2490 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2491 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2492 2493 if (prot & PROT_READ) { 2494 rc = !read_protected; 2495 } else { 2496 rc = read_protected; 2497 } 2498 2499 if (!rc) { 2500 if (os::Aix::on_pase()) { 2501 // There is an issue on older PASE systems where mprotect() will return success but the 2502 // memory will not be protected. 2503 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible 2504 // machines; we only see it rarely, when using mprotect() to protect the guard page of 2505 // a stack. It is an OS error. 2506 // 2507 // A valid strategy is just to try again. This usually works. :-/ 2508 2509 ::usleep(1000); 2510 if (::mprotect(addr, size, prot) == 0) { 2511 const bool read_protected_2 = 2512 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 && 2513 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false; 2514 rc = true; 2515 } 2516 } 2517 } 2518 } 2519 } 2520 2521 assert(rc == true, "mprotect failed."); 2522 2523 return rc; 2524 } 2525 2526 // Set protections specified 2527 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) { 2528 unsigned int p = 0; 2529 switch (prot) { 2530 case MEM_PROT_NONE: p = PROT_NONE; break; 2531 case MEM_PROT_READ: p = PROT_READ; break; 2532 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2533 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2534 default: 2535 ShouldNotReachHere(); 2536 } 2537 // is_committed is unused. 2538 return checked_mprotect(addr, size, p); 2539 } 2540 2541 bool os::guard_memory(char* addr, size_t size) { 2542 return checked_mprotect(addr, size, PROT_NONE); 2543 } 2544 2545 bool os::unguard_memory(char* addr, size_t size) { 2546 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC); 2547 } 2548 2549 // Large page support 2550 2551 static size_t _large_page_size = 0; 2552 2553 // Enable large page support if OS allows that. 2554 void os::large_page_init() { 2555 return; // Nothing to do. See query_multipage_support and friends. 2556 } 2557 2558 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) { 2559 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement 2560 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()), 2561 // so this is not needed. 2562 assert(false, "should not be called on AIX"); 2563 return NULL; 2564 } 2565 2566 bool os::release_memory_special(char* base, size_t bytes) { 2567 // Detaching the SHM segment will also delete it, see reserve_memory_special(). 2568 Unimplemented(); 2569 return false; 2570 } 2571 2572 size_t os::large_page_size() { 2573 return _large_page_size; 2574 } 2575 2576 bool os::can_commit_large_page_memory() { 2577 // Does not matter, we do not support huge pages. 2578 return false; 2579 } 2580 2581 bool os::can_execute_large_page_memory() { 2582 // Does not matter, we do not support huge pages. 2583 return false; 2584 } 2585 2586 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2587 assert(file_desc >= 0, "file_desc is not valid"); 2588 char* result = NULL; 2589 2590 // Always round to os::vm_page_size(), which may be larger than 4K. 2591 bytes = align_up(bytes, os::vm_page_size()); 2592 result = reserve_mmaped_memory(bytes, requested_addr, 0); 2593 2594 if (result != NULL) { 2595 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2596 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2597 } 2598 } 2599 return result; 2600 } 2601 2602 // Reserve memory at an arbitrary address, only if that area is 2603 // available (and not reserved for something else). 2604 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2605 char* addr = NULL; 2606 2607 // Always round to os::vm_page_size(), which may be larger than 4K. 2608 bytes = align_up(bytes, os::vm_page_size()); 2609 2610 // In 4K mode always use mmap. 2611 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted. 2612 if (os::vm_page_size() == 4*K) { 2613 return reserve_mmaped_memory(bytes, requested_addr, 0); 2614 } else { 2615 if (bytes >= Use64KPagesThreshold) { 2616 return reserve_shmated_memory(bytes, requested_addr, 0); 2617 } else { 2618 return reserve_mmaped_memory(bytes, requested_addr, 0); 2619 } 2620 } 2621 2622 return addr; 2623 } 2624 2625 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2626 return ::read(fd, buf, nBytes); 2627 } 2628 2629 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2630 return ::pread(fd, buf, nBytes, offset); 2631 } 2632 2633 void os::naked_short_sleep(jlong ms) { 2634 struct timespec req; 2635 2636 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2637 req.tv_sec = 0; 2638 if (ms > 0) { 2639 req.tv_nsec = (ms % 1000) * 1000000; 2640 } 2641 else { 2642 req.tv_nsec = 1; 2643 } 2644 2645 nanosleep(&req, NULL); 2646 2647 return; 2648 } 2649 2650 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2651 void os::infinite_sleep() { 2652 while (true) { // sleep forever ... 2653 ::sleep(100); // ... 100 seconds at a time 2654 } 2655 } 2656 2657 // Used to convert frequent JVM_Yield() to nops 2658 bool os::dont_yield() { 2659 return DontYieldALot; 2660 } 2661 2662 void os::naked_yield() { 2663 sched_yield(); 2664 } 2665 2666 //////////////////////////////////////////////////////////////////////////////// 2667 // thread priority support 2668 2669 // From AIX manpage to pthread_setschedparam 2670 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp? 2671 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm): 2672 // 2673 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the 2674 // range from 40 to 80, where 40 is the least favored priority and 80 2675 // is the most favored." 2676 // 2677 // (Actually, I doubt this even has an impact on AIX, as we do kernel 2678 // scheduling there; however, this still leaves iSeries.) 2679 // 2680 // We use the same values for AIX and PASE. 2681 int os::java_to_os_priority[CriticalPriority + 1] = { 2682 54, // 0 Entry should never be used 2683 2684 55, // 1 MinPriority 2685 55, // 2 2686 56, // 3 2687 2688 56, // 4 2689 57, // 5 NormPriority 2690 57, // 6 2691 2692 58, // 7 2693 58, // 8 2694 59, // 9 NearMaxPriority 2695 2696 60, // 10 MaxPriority 2697 2698 60 // 11 CriticalPriority 2699 }; 2700 2701 OSReturn os::set_native_priority(Thread* thread, int newpri) { 2702 if (!UseThreadPriorities) return OS_OK; 2703 pthread_t thr = thread->osthread()->pthread_id(); 2704 int policy = SCHED_OTHER; 2705 struct sched_param param; 2706 param.sched_priority = newpri; 2707 int ret = pthread_setschedparam(thr, policy, ¶m); 2708 2709 if (ret != 0) { 2710 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)", 2711 (int)thr, newpri, ret, os::errno_name(ret)); 2712 } 2713 return (ret == 0) ? OS_OK : OS_ERR; 2714 } 2715 2716 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 2717 if (!UseThreadPriorities) { 2718 *priority_ptr = java_to_os_priority[NormPriority]; 2719 return OS_OK; 2720 } 2721 pthread_t thr = thread->osthread()->pthread_id(); 2722 int policy = SCHED_OTHER; 2723 struct sched_param param; 2724 int ret = pthread_getschedparam(thr, &policy, ¶m); 2725 *priority_ptr = param.sched_priority; 2726 2727 return (ret == 0) ? OS_OK : OS_ERR; 2728 } 2729 2730 // Hint to the underlying OS that a task switch would not be good. 2731 // Void return because it's a hint and can fail. 2732 void os::hint_no_preempt() {} 2733 2734 //////////////////////////////////////////////////////////////////////////////// 2735 // suspend/resume support 2736 2737 // The low-level signal-based suspend/resume support is a remnant from the 2738 // old VM-suspension that used to be for java-suspension, safepoints etc, 2739 // within hotspot. Currently used by JFR's OSThreadSampler 2740 // 2741 // The remaining code is greatly simplified from the more general suspension 2742 // code that used to be used. 2743 // 2744 // The protocol is quite simple: 2745 // - suspend: 2746 // - sends a signal to the target thread 2747 // - polls the suspend state of the osthread using a yield loop 2748 // - target thread signal handler (SR_handler) sets suspend state 2749 // and blocks in sigsuspend until continued 2750 // - resume: 2751 // - sets target osthread state to continue 2752 // - sends signal to end the sigsuspend loop in the SR_handler 2753 // 2754 // Note that the SR_lock plays no role in this suspend/resume protocol, 2755 // but is checked for NULL in SR_handler as a thread termination indicator. 2756 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 2757 // 2758 // Note that resume_clear_context() and suspend_save_context() are needed 2759 // by SR_handler(), so that fetch_frame_from_ucontext() works, 2760 // which in part is used by: 2761 // - Forte Analyzer: AsyncGetCallTrace() 2762 // - StackBanging: get_frame_at_stack_banging_point() 2763 2764 static void resume_clear_context(OSThread *osthread) { 2765 osthread->set_ucontext(NULL); 2766 osthread->set_siginfo(NULL); 2767 } 2768 2769 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) { 2770 osthread->set_ucontext(context); 2771 osthread->set_siginfo(siginfo); 2772 } 2773 2774 // 2775 // Handler function invoked when a thread's execution is suspended or 2776 // resumed. We have to be careful that only async-safe functions are 2777 // called here (Note: most pthread functions are not async safe and 2778 // should be avoided.) 2779 // 2780 // Note: sigwait() is a more natural fit than sigsuspend() from an 2781 // interface point of view, but sigwait() prevents the signal hander 2782 // from being run. libpthread would get very confused by not having 2783 // its signal handlers run and prevents sigwait()'s use with the 2784 // mutex granting granting signal. 2785 // 2786 // Currently only ever called on the VMThread and JavaThreads (PC sampling). 2787 // 2788 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) { 2789 // Save and restore errno to avoid confusing native code with EINTR 2790 // after sigsuspend. 2791 int old_errno = errno; 2792 2793 Thread* thread = Thread::current_or_null_safe(); 2794 assert(thread != NULL, "Missing current thread in SR_handler"); 2795 2796 // On some systems we have seen signal delivery get "stuck" until the signal 2797 // mask is changed as part of thread termination. Check that the current thread 2798 // has not already terminated (via SR_lock()) - else the following assertion 2799 // will fail because the thread is no longer a JavaThread as the ~JavaThread 2800 // destructor has completed. 2801 2802 if (thread->SR_lock() == NULL) { 2803 return; 2804 } 2805 2806 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 2807 2808 OSThread* osthread = thread->osthread(); 2809 2810 os::SuspendResume::State current = osthread->sr.state(); 2811 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 2812 suspend_save_context(osthread, siginfo, context); 2813 2814 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 2815 os::SuspendResume::State state = osthread->sr.suspended(); 2816 if (state == os::SuspendResume::SR_SUSPENDED) { 2817 sigset_t suspend_set; // signals for sigsuspend() 2818 2819 // get current set of blocked signals and unblock resume signal 2820 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 2821 sigdelset(&suspend_set, SR_signum); 2822 2823 // wait here until we are resumed 2824 while (1) { 2825 sigsuspend(&suspend_set); 2826 2827 os::SuspendResume::State result = osthread->sr.running(); 2828 if (result == os::SuspendResume::SR_RUNNING) { 2829 break; 2830 } 2831 } 2832 2833 } else if (state == os::SuspendResume::SR_RUNNING) { 2834 // request was cancelled, continue 2835 } else { 2836 ShouldNotReachHere(); 2837 } 2838 2839 resume_clear_context(osthread); 2840 } else if (current == os::SuspendResume::SR_RUNNING) { 2841 // request was cancelled, continue 2842 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 2843 // ignore 2844 } else { 2845 ShouldNotReachHere(); 2846 } 2847 2848 errno = old_errno; 2849 } 2850 2851 static int SR_initialize() { 2852 struct sigaction act; 2853 char *s; 2854 // Get signal number to use for suspend/resume 2855 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) { 2856 int sig = ::strtol(s, 0, 10); 2857 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769. 2858 sig < NSIG) { // Must be legal signal and fit into sigflags[]. 2859 SR_signum = sig; 2860 } else { 2861 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.", 2862 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum); 2863 } 2864 } 2865 2866 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS, 2867 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769"); 2868 2869 sigemptyset(&SR_sigset); 2870 sigaddset(&SR_sigset, SR_signum); 2871 2872 // Set up signal handler for suspend/resume. 2873 act.sa_flags = SA_RESTART|SA_SIGINFO; 2874 act.sa_handler = (void (*)(int)) SR_handler; 2875 2876 // SR_signum is blocked by default. 2877 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask); 2878 2879 if (sigaction(SR_signum, &act, 0) == -1) { 2880 return -1; 2881 } 2882 2883 // Save signal flag 2884 os::Aix::set_our_sigflags(SR_signum, act.sa_flags); 2885 return 0; 2886 } 2887 2888 static int SR_finalize() { 2889 return 0; 2890 } 2891 2892 static int sr_notify(OSThread* osthread) { 2893 int status = pthread_kill(osthread->pthread_id(), SR_signum); 2894 assert_status(status == 0, status, "pthread_kill"); 2895 return status; 2896 } 2897 2898 // "Randomly" selected value for how long we want to spin 2899 // before bailing out on suspending a thread, also how often 2900 // we send a signal to a thread we want to resume 2901 static const int RANDOMLY_LARGE_INTEGER = 1000000; 2902 static const int RANDOMLY_LARGE_INTEGER2 = 100; 2903 2904 // returns true on success and false on error - really an error is fatal 2905 // but this seems the normal response to library errors 2906 static bool do_suspend(OSThread* osthread) { 2907 assert(osthread->sr.is_running(), "thread should be running"); 2908 // mark as suspended and send signal 2909 2910 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 2911 // failed to switch, state wasn't running? 2912 ShouldNotReachHere(); 2913 return false; 2914 } 2915 2916 if (sr_notify(osthread) != 0) { 2917 // try to cancel, switch to running 2918 2919 os::SuspendResume::State result = osthread->sr.cancel_suspend(); 2920 if (result == os::SuspendResume::SR_RUNNING) { 2921 // cancelled 2922 return false; 2923 } else if (result == os::SuspendResume::SR_SUSPENDED) { 2924 // somehow managed to suspend 2925 return true; 2926 } else { 2927 ShouldNotReachHere(); 2928 return false; 2929 } 2930 } 2931 2932 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 2933 2934 for (int n = 0; !osthread->sr.is_suspended(); n++) { 2935 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) { 2936 os::naked_yield(); 2937 } 2938 2939 // timeout, try to cancel the request 2940 if (n >= RANDOMLY_LARGE_INTEGER) { 2941 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 2942 if (cancelled == os::SuspendResume::SR_RUNNING) { 2943 return false; 2944 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 2945 return true; 2946 } else { 2947 ShouldNotReachHere(); 2948 return false; 2949 } 2950 } 2951 } 2952 2953 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 2954 return true; 2955 } 2956 2957 static void do_resume(OSThread* osthread) { 2958 //assert(osthread->sr.is_suspended(), "thread should be suspended"); 2959 2960 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 2961 // failed to switch to WAKEUP_REQUEST 2962 ShouldNotReachHere(); 2963 return; 2964 } 2965 2966 while (!osthread->sr.is_running()) { 2967 if (sr_notify(osthread) == 0) { 2968 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) { 2969 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) { 2970 os::naked_yield(); 2971 } 2972 } 2973 } else { 2974 ShouldNotReachHere(); 2975 } 2976 } 2977 2978 guarantee(osthread->sr.is_running(), "Must be running!"); 2979 } 2980 2981 /////////////////////////////////////////////////////////////////////////////////// 2982 // signal handling (except suspend/resume) 2983 2984 // This routine may be used by user applications as a "hook" to catch signals. 2985 // The user-defined signal handler must pass unrecognized signals to this 2986 // routine, and if it returns true (non-zero), then the signal handler must 2987 // return immediately. If the flag "abort_if_unrecognized" is true, then this 2988 // routine will never retun false (zero), but instead will execute a VM panic 2989 // routine kill the process. 2990 // 2991 // If this routine returns false, it is OK to call it again. This allows 2992 // the user-defined signal handler to perform checks either before or after 2993 // the VM performs its own checks. Naturally, the user code would be making 2994 // a serious error if it tried to handle an exception (such as a null check 2995 // or breakpoint) that the VM was generating for its own correct operation. 2996 // 2997 // This routine may recognize any of the following kinds of signals: 2998 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1. 2999 // It should be consulted by handlers for any of those signals. 3000 // 3001 // The caller of this routine must pass in the three arguments supplied 3002 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3003 // field of the structure passed to sigaction(). This routine assumes that 3004 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3005 // 3006 // Note that the VM will print warnings if it detects conflicting signal 3007 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3008 // 3009 extern "C" JNIEXPORT int 3010 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 3011 3012 // Set thread signal mask (for some reason on AIX sigthreadmask() seems 3013 // to be the thing to call; documentation is not terribly clear about whether 3014 // pthread_sigmask also works, and if it does, whether it does the same. 3015 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) { 3016 const int rc = ::pthread_sigmask(how, set, oset); 3017 // return value semantics differ slightly for error case: 3018 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno 3019 // (so, pthread_sigmask is more theadsafe for error handling) 3020 // But success is always 0. 3021 return rc == 0 ? true : false; 3022 } 3023 3024 // Function to unblock all signals which are, according 3025 // to POSIX, typical program error signals. If they happen while being blocked, 3026 // they typically will bring down the process immediately. 3027 bool unblock_program_error_signals() { 3028 sigset_t set; 3029 ::sigemptyset(&set); 3030 ::sigaddset(&set, SIGILL); 3031 ::sigaddset(&set, SIGBUS); 3032 ::sigaddset(&set, SIGFPE); 3033 ::sigaddset(&set, SIGSEGV); 3034 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL); 3035 } 3036 3037 // Renamed from 'signalHandler' to avoid collision with other shared libs. 3038 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) { 3039 assert(info != NULL && uc != NULL, "it must be old kernel"); 3040 3041 // Never leave program error signals blocked; 3042 // on all our platforms they would bring down the process immediately when 3043 // getting raised while being blocked. 3044 unblock_program_error_signals(); 3045 3046 int orig_errno = errno; // Preserve errno value over signal handler. 3047 JVM_handle_aix_signal(sig, info, uc, true); 3048 errno = orig_errno; 3049 } 3050 3051 // This boolean allows users to forward their own non-matching signals 3052 // to JVM_handle_aix_signal, harmlessly. 3053 bool os::Aix::signal_handlers_are_installed = false; 3054 3055 // For signal-chaining 3056 struct sigaction sigact[NSIG]; 3057 sigset_t sigs; 3058 bool os::Aix::libjsig_is_loaded = false; 3059 typedef struct sigaction *(*get_signal_t)(int); 3060 get_signal_t os::Aix::get_signal_action = NULL; 3061 3062 struct sigaction* os::Aix::get_chained_signal_action(int sig) { 3063 struct sigaction *actp = NULL; 3064 3065 if (libjsig_is_loaded) { 3066 // Retrieve the old signal handler from libjsig 3067 actp = (*get_signal_action)(sig); 3068 } 3069 if (actp == NULL) { 3070 // Retrieve the preinstalled signal handler from jvm 3071 actp = get_preinstalled_handler(sig); 3072 } 3073 3074 return actp; 3075 } 3076 3077 static bool call_chained_handler(struct sigaction *actp, int sig, 3078 siginfo_t *siginfo, void *context) { 3079 // Call the old signal handler 3080 if (actp->sa_handler == SIG_DFL) { 3081 // It's more reasonable to let jvm treat it as an unexpected exception 3082 // instead of taking the default action. 3083 return false; 3084 } else if (actp->sa_handler != SIG_IGN) { 3085 if ((actp->sa_flags & SA_NODEFER) == 0) { 3086 // automaticlly block the signal 3087 sigaddset(&(actp->sa_mask), sig); 3088 } 3089 3090 sa_handler_t hand = NULL; 3091 sa_sigaction_t sa = NULL; 3092 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3093 // retrieve the chained handler 3094 if (siginfo_flag_set) { 3095 sa = actp->sa_sigaction; 3096 } else { 3097 hand = actp->sa_handler; 3098 } 3099 3100 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3101 actp->sa_handler = SIG_DFL; 3102 } 3103 3104 // try to honor the signal mask 3105 sigset_t oset; 3106 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3107 3108 // call into the chained handler 3109 if (siginfo_flag_set) { 3110 (*sa)(sig, siginfo, context); 3111 } else { 3112 (*hand)(sig); 3113 } 3114 3115 // restore the signal mask 3116 pthread_sigmask(SIG_SETMASK, &oset, 0); 3117 } 3118 // Tell jvm's signal handler the signal is taken care of. 3119 return true; 3120 } 3121 3122 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3123 bool chained = false; 3124 // signal-chaining 3125 if (UseSignalChaining) { 3126 struct sigaction *actp = get_chained_signal_action(sig); 3127 if (actp != NULL) { 3128 chained = call_chained_handler(actp, sig, siginfo, context); 3129 } 3130 } 3131 return chained; 3132 } 3133 3134 struct sigaction* os::Aix::get_preinstalled_handler(int sig) { 3135 if (sigismember(&sigs, sig)) { 3136 return &sigact[sig]; 3137 } 3138 return NULL; 3139 } 3140 3141 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 3142 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3143 sigact[sig] = oldAct; 3144 sigaddset(&sigs, sig); 3145 } 3146 3147 // for diagnostic 3148 int sigflags[NSIG]; 3149 3150 int os::Aix::get_our_sigflags(int sig) { 3151 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3152 return sigflags[sig]; 3153 } 3154 3155 void os::Aix::set_our_sigflags(int sig, int flags) { 3156 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3157 if (sig > 0 && sig < NSIG) { 3158 sigflags[sig] = flags; 3159 } 3160 } 3161 3162 void os::Aix::set_signal_handler(int sig, bool set_installed) { 3163 // Check for overwrite. 3164 struct sigaction oldAct; 3165 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3166 3167 void* oldhand = oldAct.sa_sigaction 3168 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3169 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3170 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3171 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3172 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) { 3173 if (AllowUserSignalHandlers || !set_installed) { 3174 // Do not overwrite; user takes responsibility to forward to us. 3175 return; 3176 } else if (UseSignalChaining) { 3177 // save the old handler in jvm 3178 save_preinstalled_handler(sig, oldAct); 3179 // libjsig also interposes the sigaction() call below and saves the 3180 // old sigaction on it own. 3181 } else { 3182 fatal("Encountered unexpected pre-existing sigaction handler " 3183 "%#lx for signal %d.", (long)oldhand, sig); 3184 } 3185 } 3186 3187 struct sigaction sigAct; 3188 sigfillset(&(sigAct.sa_mask)); 3189 if (!set_installed) { 3190 sigAct.sa_handler = SIG_DFL; 3191 sigAct.sa_flags = SA_RESTART; 3192 } else { 3193 sigAct.sa_sigaction = javaSignalHandler; 3194 sigAct.sa_flags = SA_SIGINFO|SA_RESTART; 3195 } 3196 // Save flags, which are set by ours 3197 assert(sig > 0 && sig < NSIG, "vm signal out of expected range"); 3198 sigflags[sig] = sigAct.sa_flags; 3199 3200 int ret = sigaction(sig, &sigAct, &oldAct); 3201 assert(ret == 0, "check"); 3202 3203 void* oldhand2 = oldAct.sa_sigaction 3204 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3205 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3206 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3207 } 3208 3209 // install signal handlers for signals that HotSpot needs to 3210 // handle in order to support Java-level exception handling. 3211 void os::Aix::install_signal_handlers() { 3212 if (!signal_handlers_are_installed) { 3213 signal_handlers_are_installed = true; 3214 3215 // signal-chaining 3216 typedef void (*signal_setting_t)(); 3217 signal_setting_t begin_signal_setting = NULL; 3218 signal_setting_t end_signal_setting = NULL; 3219 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3220 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3221 if (begin_signal_setting != NULL) { 3222 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3223 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3224 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3225 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3226 libjsig_is_loaded = true; 3227 assert(UseSignalChaining, "should enable signal-chaining"); 3228 } 3229 if (libjsig_is_loaded) { 3230 // Tell libjsig jvm is setting signal handlers. 3231 (*begin_signal_setting)(); 3232 } 3233 3234 ::sigemptyset(&sigs); 3235 set_signal_handler(SIGSEGV, true); 3236 set_signal_handler(SIGPIPE, true); 3237 set_signal_handler(SIGBUS, true); 3238 set_signal_handler(SIGILL, true); 3239 set_signal_handler(SIGFPE, true); 3240 set_signal_handler(SIGTRAP, true); 3241 set_signal_handler(SIGXFSZ, true); 3242 3243 if (libjsig_is_loaded) { 3244 // Tell libjsig jvm finishes setting signal handlers. 3245 (*end_signal_setting)(); 3246 } 3247 3248 // We don't activate signal checker if libjsig is in place, we trust ourselves 3249 // and if UserSignalHandler is installed all bets are off. 3250 // Log that signal checking is off only if -verbose:jni is specified. 3251 if (CheckJNICalls) { 3252 if (libjsig_is_loaded) { 3253 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3254 check_signals = false; 3255 } 3256 if (AllowUserSignalHandlers) { 3257 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3258 check_signals = false; 3259 } 3260 // Need to initialize check_signal_done. 3261 ::sigemptyset(&check_signal_done); 3262 } 3263 } 3264 } 3265 3266 static const char* get_signal_handler_name(address handler, 3267 char* buf, int buflen) { 3268 int offset; 3269 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 3270 if (found) { 3271 // skip directory names 3272 const char *p1, *p2; 3273 p1 = buf; 3274 size_t len = strlen(os::file_separator()); 3275 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 3276 // The way os::dll_address_to_library_name is implemented on Aix 3277 // right now, it always returns -1 for the offset which is not 3278 // terribly informative. 3279 // Will fix that. For now, omit the offset. 3280 jio_snprintf(buf, buflen, "%s", p1); 3281 } else { 3282 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 3283 } 3284 return buf; 3285 } 3286 3287 static void print_signal_handler(outputStream* st, int sig, 3288 char* buf, size_t buflen) { 3289 struct sigaction sa; 3290 sigaction(sig, NULL, &sa); 3291 3292 st->print("%s: ", os::exception_name(sig, buf, buflen)); 3293 3294 address handler = (sa.sa_flags & SA_SIGINFO) 3295 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 3296 : CAST_FROM_FN_PTR(address, sa.sa_handler); 3297 3298 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 3299 st->print("SIG_DFL"); 3300 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 3301 st->print("SIG_IGN"); 3302 } else { 3303 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 3304 } 3305 3306 // Print readable mask. 3307 st->print(", sa_mask[0]="); 3308 os::Posix::print_signal_set_short(st, &sa.sa_mask); 3309 3310 address rh = VMError::get_resetted_sighandler(sig); 3311 // May be, handler was resetted by VMError? 3312 if (rh != NULL) { 3313 handler = rh; 3314 sa.sa_flags = VMError::get_resetted_sigflags(sig); 3315 } 3316 3317 // Print textual representation of sa_flags. 3318 st->print(", sa_flags="); 3319 os::Posix::print_sa_flags(st, sa.sa_flags); 3320 3321 // Check: is it our handler? 3322 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) || 3323 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) { 3324 // It is our signal handler. 3325 // Check for flags, reset system-used one! 3326 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) { 3327 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library", 3328 os::Aix::get_our_sigflags(sig)); 3329 } 3330 } 3331 st->cr(); 3332 } 3333 3334 #define DO_SIGNAL_CHECK(sig) \ 3335 if (!sigismember(&check_signal_done, sig)) \ 3336 os::Aix::check_signal_handler(sig) 3337 3338 // This method is a periodic task to check for misbehaving JNI applications 3339 // under CheckJNI, we can add any periodic checks here 3340 3341 void os::run_periodic_checks() { 3342 3343 if (check_signals == false) return; 3344 3345 // SEGV and BUS if overridden could potentially prevent 3346 // generation of hs*.log in the event of a crash, debugging 3347 // such a case can be very challenging, so we absolutely 3348 // check the following for a good measure: 3349 DO_SIGNAL_CHECK(SIGSEGV); 3350 DO_SIGNAL_CHECK(SIGILL); 3351 DO_SIGNAL_CHECK(SIGFPE); 3352 DO_SIGNAL_CHECK(SIGBUS); 3353 DO_SIGNAL_CHECK(SIGPIPE); 3354 DO_SIGNAL_CHECK(SIGXFSZ); 3355 if (UseSIGTRAP) { 3356 DO_SIGNAL_CHECK(SIGTRAP); 3357 } 3358 3359 // ReduceSignalUsage allows the user to override these handlers 3360 // see comments at the very top and jvm_md.h 3361 if (!ReduceSignalUsage) { 3362 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3363 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3364 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3365 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3366 } 3367 3368 DO_SIGNAL_CHECK(SR_signum); 3369 } 3370 3371 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3372 3373 static os_sigaction_t os_sigaction = NULL; 3374 3375 void os::Aix::check_signal_handler(int sig) { 3376 char buf[O_BUFLEN]; 3377 address jvmHandler = NULL; 3378 3379 struct sigaction act; 3380 if (os_sigaction == NULL) { 3381 // only trust the default sigaction, in case it has been interposed 3382 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction")); 3383 if (os_sigaction == NULL) return; 3384 } 3385 3386 os_sigaction(sig, (struct sigaction*)NULL, &act); 3387 3388 address thisHandler = (act.sa_flags & SA_SIGINFO) 3389 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3390 : CAST_FROM_FN_PTR(address, act.sa_handler); 3391 3392 switch(sig) { 3393 case SIGSEGV: 3394 case SIGBUS: 3395 case SIGFPE: 3396 case SIGPIPE: 3397 case SIGILL: 3398 case SIGXFSZ: 3399 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler); 3400 break; 3401 3402 case SHUTDOWN1_SIGNAL: 3403 case SHUTDOWN2_SIGNAL: 3404 case SHUTDOWN3_SIGNAL: 3405 case BREAK_SIGNAL: 3406 jvmHandler = (address)user_handler(); 3407 break; 3408 3409 default: 3410 if (sig == SR_signum) { 3411 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler); 3412 } else { 3413 return; 3414 } 3415 break; 3416 } 3417 3418 if (thisHandler != jvmHandler) { 3419 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3420 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3421 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3422 // No need to check this sig any longer 3423 sigaddset(&check_signal_done, sig); 3424 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3425 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3426 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3427 exception_name(sig, buf, O_BUFLEN)); 3428 } 3429 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) { 3430 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3431 tty->print("expected:"); 3432 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig)); 3433 tty->cr(); 3434 tty->print(" found:"); 3435 os::Posix::print_sa_flags(tty, act.sa_flags); 3436 tty->cr(); 3437 // No need to check this sig any longer 3438 sigaddset(&check_signal_done, sig); 3439 } 3440 3441 // Dump all the signal 3442 if (sigismember(&check_signal_done, sig)) { 3443 print_signal_handlers(tty, buf, O_BUFLEN); 3444 } 3445 } 3446 3447 // To install functions for atexit system call 3448 extern "C" { 3449 static void perfMemory_exit_helper() { 3450 perfMemory_exit(); 3451 } 3452 } 3453 3454 // This is called _before_ the most of global arguments have been parsed. 3455 void os::init(void) { 3456 // This is basic, we want to know if that ever changes. 3457 // (Shared memory boundary is supposed to be a 256M aligned.) 3458 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected"); 3459 3460 // Record process break at startup. 3461 g_brk_at_startup = (address) ::sbrk(0); 3462 assert(g_brk_at_startup != (address) -1, "sbrk failed"); 3463 3464 // First off, we need to know whether we run on AIX or PASE, and 3465 // the OS level we run on. 3466 os::Aix::initialize_os_info(); 3467 3468 // Scan environment (SPEC1170 behaviour, etc). 3469 os::Aix::scan_environment(); 3470 3471 // Probe multipage support. 3472 query_multipage_support(); 3473 3474 // Act like we only have one page size by eliminating corner cases which 3475 // we did not support very well anyway. 3476 // We have two input conditions: 3477 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the 3478 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker 3479 // setting. 3480 // Data segment page size is important for us because it defines the thread stack page 3481 // size, which is needed for guard page handling, stack banging etc. 3482 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can 3483 // and should be allocated with 64k pages. 3484 // 3485 // So, we do the following: 3486 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks 3487 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated 3488 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings 3489 // 64k no --- AIX 5.2 ? --- 3490 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking) 3491 3492 // We explicitly leave no option to change page size, because only upgrading would work, 3493 // not downgrading (if stack page size is 64k you cannot pretend its 4k). 3494 3495 if (g_multipage_support.datapsize == 4*K) { 3496 // datapsize = 4K. Data segment, thread stacks are 4K paged. 3497 if (g_multipage_support.can_use_64K_pages) { 3498 // .. but we are able to use 64K pages dynamically. 3499 // This would be typical for java launchers which are not linked 3500 // with datapsize=64K (like, any other launcher but our own). 3501 // 3502 // In this case it would be smart to allocate the java heap with 64K 3503 // to get the performance benefit, and to fake 64k pages for the 3504 // data segment (when dealing with thread stacks). 3505 // 3506 // However, leave a possibility to downgrade to 4K, using 3507 // -XX:-Use64KPages. 3508 if (Use64KPages) { 3509 trcVerbose("64K page mode (faked for data segment)"); 3510 Aix::_page_size = 64*K; 3511 } else { 3512 trcVerbose("4K page mode (Use64KPages=off)"); 3513 Aix::_page_size = 4*K; 3514 } 3515 } else { 3516 // .. and not able to allocate 64k pages dynamically. Here, just 3517 // fall back to 4K paged mode and use mmap for everything. 3518 trcVerbose("4K page mode"); 3519 Aix::_page_size = 4*K; 3520 FLAG_SET_ERGO(bool, Use64KPages, false); 3521 } 3522 } else { 3523 // datapsize = 64k. Data segment, thread stacks are 64k paged. 3524 // This normally means that we can allocate 64k pages dynamically. 3525 // (There is one special case where this may be false: EXTSHM=on. 3526 // but we decided to not support that mode). 3527 assert0(g_multipage_support.can_use_64K_pages); 3528 Aix::_page_size = 64*K; 3529 trcVerbose("64K page mode"); 3530 FLAG_SET_ERGO(bool, Use64KPages, true); 3531 } 3532 3533 // For now UseLargePages is just ignored. 3534 FLAG_SET_ERGO(bool, UseLargePages, false); 3535 _page_sizes[0] = 0; 3536 3537 // debug trace 3538 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size())); 3539 3540 // Next, we need to initialize libo4 and libperfstat libraries. 3541 if (os::Aix::on_pase()) { 3542 os::Aix::initialize_libo4(); 3543 } else { 3544 os::Aix::initialize_libperfstat(); 3545 } 3546 3547 // Reset the perfstat information provided by ODM. 3548 if (os::Aix::on_aix()) { 3549 libperfstat::perfstat_reset(); 3550 } 3551 3552 // Now initialze basic system properties. Note that for some of the values we 3553 // need libperfstat etc. 3554 os::Aix::initialize_system_info(); 3555 3556 clock_tics_per_sec = sysconf(_SC_CLK_TCK); 3557 3558 init_random(1234567); 3559 3560 // _main_thread points to the thread that created/loaded the JVM. 3561 Aix::_main_thread = pthread_self(); 3562 3563 initial_time_count = os::elapsed_counter(); 3564 3565 os::Posix::init(); 3566 } 3567 3568 // This is called _after_ the global arguments have been parsed. 3569 jint os::init_2(void) { 3570 3571 os::Posix::init_2(); 3572 3573 if (os::Aix::on_pase()) { 3574 trcVerbose("Running on PASE."); 3575 } else { 3576 trcVerbose("Running on AIX (not PASE)."); 3577 } 3578 3579 trcVerbose("processor count: %d", os::_processor_count); 3580 trcVerbose("physical memory: %lu", Aix::_physical_memory); 3581 3582 // Initially build up the loaded dll map. 3583 LoadedLibraries::reload(); 3584 if (Verbose) { 3585 trcVerbose("Loaded Libraries: "); 3586 LoadedLibraries::print(tty); 3587 } 3588 3589 // initialize suspend/resume support - must do this before signal_sets_init() 3590 if (SR_initialize() != 0) { 3591 perror("SR_initialize failed"); 3592 return JNI_ERR; 3593 } 3594 3595 Aix::signal_sets_init(); 3596 Aix::install_signal_handlers(); 3597 // Initialize data for jdk.internal.misc.Signal 3598 if (!ReduceSignalUsage) { 3599 signal_init_pd(); 3600 } 3601 3602 // Check and sets minimum stack sizes against command line options 3603 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3604 return JNI_ERR; 3605 } 3606 3607 if (UseNUMA) { 3608 UseNUMA = false; 3609 warning("NUMA optimizations are not available on this OS."); 3610 } 3611 3612 if (MaxFDLimit) { 3613 // Set the number of file descriptors to max. print out error 3614 // if getrlimit/setrlimit fails but continue regardless. 3615 struct rlimit nbr_files; 3616 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3617 if (status != 0) { 3618 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3619 } else { 3620 nbr_files.rlim_cur = nbr_files.rlim_max; 3621 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3622 if (status != 0) { 3623 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3624 } 3625 } 3626 } 3627 3628 if (PerfAllowAtExitRegistration) { 3629 // Only register atexit functions if PerfAllowAtExitRegistration is set. 3630 // At exit functions can be delayed until process exit time, which 3631 // can be problematic for embedded VM situations. Embedded VMs should 3632 // call DestroyJavaVM() to assure that VM resources are released. 3633 3634 // Note: perfMemory_exit_helper atexit function may be removed in 3635 // the future if the appropriate cleanup code can be added to the 3636 // VM_Exit VMOperation's doit method. 3637 if (atexit(perfMemory_exit_helper) != 0) { 3638 warning("os::init_2 atexit(perfMemory_exit_helper) failed"); 3639 } 3640 } 3641 3642 return JNI_OK; 3643 } 3644 3645 // Mark the polling page as unreadable 3646 void os::make_polling_page_unreadable(void) { 3647 if (!guard_memory((char*)_polling_page, Aix::page_size())) { 3648 fatal("Could not disable polling page"); 3649 } 3650 }; 3651 3652 // Mark the polling page as readable 3653 void os::make_polling_page_readable(void) { 3654 // Changed according to os_linux.cpp. 3655 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) { 3656 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page); 3657 } 3658 }; 3659 3660 int os::active_processor_count() { 3661 // User has overridden the number of active processors 3662 if (ActiveProcessorCount > 0) { 3663 log_trace(os)("active_processor_count: " 3664 "active processor count set by user : %d", 3665 ActiveProcessorCount); 3666 return ActiveProcessorCount; 3667 } 3668 3669 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN); 3670 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check"); 3671 return online_cpus; 3672 } 3673 3674 void os::set_native_thread_name(const char *name) { 3675 // Not yet implemented. 3676 return; 3677 } 3678 3679 bool os::distribute_processes(uint length, uint* distribution) { 3680 // Not yet implemented. 3681 return false; 3682 } 3683 3684 bool os::bind_to_processor(uint processor_id) { 3685 // Not yet implemented. 3686 return false; 3687 } 3688 3689 void os::SuspendedThreadTask::internal_do_task() { 3690 if (do_suspend(_thread->osthread())) { 3691 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3692 do_task(context); 3693 do_resume(_thread->osthread()); 3694 } 3695 } 3696 3697 //////////////////////////////////////////////////////////////////////////////// 3698 // debug support 3699 3700 bool os::find(address addr, outputStream* st) { 3701 3702 st->print(PTR_FORMAT ": ", addr); 3703 3704 loaded_module_t lm; 3705 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL || 3706 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) { 3707 st->print_cr("%s", lm.path); 3708 return true; 3709 } 3710 3711 return false; 3712 } 3713 3714 //////////////////////////////////////////////////////////////////////////////// 3715 // misc 3716 3717 // This does not do anything on Aix. This is basically a hook for being 3718 // able to use structured exception handling (thread-local exception filters) 3719 // on, e.g., Win32. 3720 void 3721 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, 3722 JavaCallArguments* args, Thread* thread) { 3723 f(value, method, args, thread); 3724 } 3725 3726 void os::print_statistics() { 3727 } 3728 3729 bool os::message_box(const char* title, const char* message) { 3730 int i; 3731 fdStream err(defaultStream::error_fd()); 3732 for (i = 0; i < 78; i++) err.print_raw("="); 3733 err.cr(); 3734 err.print_raw_cr(title); 3735 for (i = 0; i < 78; i++) err.print_raw("-"); 3736 err.cr(); 3737 err.print_raw_cr(message); 3738 for (i = 0; i < 78; i++) err.print_raw("="); 3739 err.cr(); 3740 3741 char buf[16]; 3742 // Prevent process from exiting upon "read error" without consuming all CPU 3743 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3744 3745 return buf[0] == 'y' || buf[0] == 'Y'; 3746 } 3747 3748 int os::stat(const char *path, struct stat *sbuf) { 3749 char pathbuf[MAX_PATH]; 3750 if (strlen(path) > MAX_PATH - 1) { 3751 errno = ENAMETOOLONG; 3752 return -1; 3753 } 3754 os::native_path(strcpy(pathbuf, path)); 3755 return ::stat(pathbuf, sbuf); 3756 } 3757 3758 // Is a (classpath) directory empty? 3759 bool os::dir_is_empty(const char* path) { 3760 DIR *dir = NULL; 3761 struct dirent *ptr; 3762 3763 dir = opendir(path); 3764 if (dir == NULL) return true; 3765 3766 /* Scan the directory */ 3767 bool result = true; 3768 char buf[sizeof(struct dirent) + MAX_PATH]; 3769 while (result && (ptr = ::readdir(dir)) != NULL) { 3770 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 3771 result = false; 3772 } 3773 } 3774 closedir(dir); 3775 return result; 3776 } 3777 3778 // This code originates from JDK's sysOpen and open64_w 3779 // from src/solaris/hpi/src/system_md.c 3780 3781 int os::open(const char *path, int oflag, int mode) { 3782 3783 if (strlen(path) > MAX_PATH - 1) { 3784 errno = ENAMETOOLONG; 3785 return -1; 3786 } 3787 int fd; 3788 3789 fd = ::open64(path, oflag, mode); 3790 if (fd == -1) return -1; 3791 3792 // If the open succeeded, the file might still be a directory. 3793 { 3794 struct stat64 buf64; 3795 int ret = ::fstat64(fd, &buf64); 3796 int st_mode = buf64.st_mode; 3797 3798 if (ret != -1) { 3799 if ((st_mode & S_IFMT) == S_IFDIR) { 3800 errno = EISDIR; 3801 ::close(fd); 3802 return -1; 3803 } 3804 } else { 3805 ::close(fd); 3806 return -1; 3807 } 3808 } 3809 3810 // All file descriptors that are opened in the JVM and not 3811 // specifically destined for a subprocess should have the 3812 // close-on-exec flag set. If we don't set it, then careless 3rd 3813 // party native code might fork and exec without closing all 3814 // appropriate file descriptors (e.g. as we do in closeDescriptors in 3815 // UNIXProcess.c), and this in turn might: 3816 // 3817 // - cause end-of-file to fail to be detected on some file 3818 // descriptors, resulting in mysterious hangs, or 3819 // 3820 // - might cause an fopen in the subprocess to fail on a system 3821 // suffering from bug 1085341. 3822 // 3823 // (Yes, the default setting of the close-on-exec flag is a Unix 3824 // design flaw.) 3825 // 3826 // See: 3827 // 1085341: 32-bit stdio routines should support file descriptors >255 3828 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 3829 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 3830 #ifdef FD_CLOEXEC 3831 { 3832 int flags = ::fcntl(fd, F_GETFD); 3833 if (flags != -1) 3834 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 3835 } 3836 #endif 3837 3838 return fd; 3839 } 3840 3841 // create binary file, rewriting existing file if required 3842 int os::create_binary_file(const char* path, bool rewrite_existing) { 3843 int oflags = O_WRONLY | O_CREAT; 3844 if (!rewrite_existing) { 3845 oflags |= O_EXCL; 3846 } 3847 return ::open64(path, oflags, S_IREAD | S_IWRITE); 3848 } 3849 3850 // return current position of file pointer 3851 jlong os::current_file_offset(int fd) { 3852 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 3853 } 3854 3855 // move file pointer to the specified offset 3856 jlong os::seek_to_file_offset(int fd, jlong offset) { 3857 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 3858 } 3859 3860 // This code originates from JDK's sysAvailable 3861 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c 3862 3863 int os::available(int fd, jlong *bytes) { 3864 jlong cur, end; 3865 int mode; 3866 struct stat64 buf64; 3867 3868 if (::fstat64(fd, &buf64) >= 0) { 3869 mode = buf64.st_mode; 3870 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 3871 int n; 3872 if (::ioctl(fd, FIONREAD, &n) >= 0) { 3873 *bytes = n; 3874 return 1; 3875 } 3876 } 3877 } 3878 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 3879 return 0; 3880 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 3881 return 0; 3882 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 3883 return 0; 3884 } 3885 *bytes = end - cur; 3886 return 1; 3887 } 3888 3889 // Map a block of memory. 3890 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 3891 char *addr, size_t bytes, bool read_only, 3892 bool allow_exec) { 3893 int prot; 3894 int flags = MAP_PRIVATE; 3895 3896 if (read_only) { 3897 prot = PROT_READ; 3898 flags = MAP_SHARED; 3899 } else { 3900 prot = PROT_READ | PROT_WRITE; 3901 flags = MAP_PRIVATE; 3902 } 3903 3904 if (allow_exec) { 3905 prot |= PROT_EXEC; 3906 } 3907 3908 if (addr != NULL) { 3909 flags |= MAP_FIXED; 3910 } 3911 3912 // Allow anonymous mappings if 'fd' is -1. 3913 if (fd == -1) { 3914 flags |= MAP_ANONYMOUS; 3915 } 3916 3917 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags, 3918 fd, file_offset); 3919 if (mapped_address == MAP_FAILED) { 3920 return NULL; 3921 } 3922 return mapped_address; 3923 } 3924 3925 // Remap a block of memory. 3926 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 3927 char *addr, size_t bytes, bool read_only, 3928 bool allow_exec) { 3929 // same as map_memory() on this OS 3930 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 3931 allow_exec); 3932 } 3933 3934 // Unmap a block of memory. 3935 bool os::pd_unmap_memory(char* addr, size_t bytes) { 3936 return munmap(addr, bytes) == 0; 3937 } 3938 3939 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 3940 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 3941 // of a thread. 3942 // 3943 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns 3944 // the fast estimate available on the platform. 3945 3946 jlong os::current_thread_cpu_time() { 3947 // return user + sys since the cost is the same 3948 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */); 3949 assert(n >= 0, "negative CPU time"); 3950 return n; 3951 } 3952 3953 jlong os::thread_cpu_time(Thread* thread) { 3954 // consistent with what current_thread_cpu_time() returns 3955 const jlong n = os::thread_cpu_time(thread, true /* user + sys */); 3956 assert(n >= 0, "negative CPU time"); 3957 return n; 3958 } 3959 3960 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 3961 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 3962 assert(n >= 0, "negative CPU time"); 3963 return n; 3964 } 3965 3966 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) { 3967 bool error = false; 3968 3969 jlong sys_time = 0; 3970 jlong user_time = 0; 3971 3972 // Reimplemented using getthrds64(). 3973 // 3974 // Works like this: 3975 // For the thread in question, get the kernel thread id. Then get the 3976 // kernel thread statistics using that id. 3977 // 3978 // This only works of course when no pthread scheduling is used, 3979 // i.e. there is a 1:1 relationship to kernel threads. 3980 // On AIX, see AIXTHREAD_SCOPE variable. 3981 3982 pthread_t pthtid = thread->osthread()->pthread_id(); 3983 3984 // retrieve kernel thread id for the pthread: 3985 tid64_t tid = 0; 3986 struct __pthrdsinfo pinfo; 3987 // I just love those otherworldly IBM APIs which force me to hand down 3988 // dummy buffers for stuff I dont care for... 3989 char dummy[1]; 3990 int dummy_size = sizeof(dummy); 3991 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo), 3992 dummy, &dummy_size) == 0) { 3993 tid = pinfo.__pi_tid; 3994 } else { 3995 tty->print_cr("pthread_getthrds_np failed."); 3996 error = true; 3997 } 3998 3999 // retrieve kernel timing info for that kernel thread 4000 if (!error) { 4001 struct thrdentry64 thrdentry; 4002 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) { 4003 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL; 4004 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL; 4005 } else { 4006 tty->print_cr("pthread_getthrds_np failed."); 4007 error = true; 4008 } 4009 } 4010 4011 if (p_sys_time) { 4012 *p_sys_time = sys_time; 4013 } 4014 4015 if (p_user_time) { 4016 *p_user_time = user_time; 4017 } 4018 4019 if (error) { 4020 return false; 4021 } 4022 4023 return true; 4024 } 4025 4026 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4027 jlong sys_time; 4028 jlong user_time; 4029 4030 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) { 4031 return -1; 4032 } 4033 4034 return user_sys_cpu_time ? sys_time + user_time : user_time; 4035 } 4036 4037 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4038 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4039 info_ptr->may_skip_backward = false; // elapsed time not wall time 4040 info_ptr->may_skip_forward = false; // elapsed time not wall time 4041 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4042 } 4043 4044 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4045 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4046 info_ptr->may_skip_backward = false; // elapsed time not wall time 4047 info_ptr->may_skip_forward = false; // elapsed time not wall time 4048 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned 4049 } 4050 4051 bool os::is_thread_cpu_time_supported() { 4052 return true; 4053 } 4054 4055 // System loadavg support. Returns -1 if load average cannot be obtained. 4056 // For now just return the system wide load average (no processor sets). 4057 int os::loadavg(double values[], int nelem) { 4058 4059 guarantee(nelem >= 0 && nelem <= 3, "argument error"); 4060 guarantee(values, "argument error"); 4061 4062 if (os::Aix::on_pase()) { 4063 4064 // AS/400 PASE: use libo4 porting library 4065 double v[3] = { 0.0, 0.0, 0.0 }; 4066 4067 if (libo4::get_load_avg(v, v + 1, v + 2)) { 4068 for (int i = 0; i < nelem; i ++) { 4069 values[i] = v[i]; 4070 } 4071 return nelem; 4072 } else { 4073 return -1; 4074 } 4075 4076 } else { 4077 4078 // AIX: use libperfstat 4079 libperfstat::cpuinfo_t ci; 4080 if (libperfstat::get_cpuinfo(&ci)) { 4081 for (int i = 0; i < nelem; i++) { 4082 values[i] = ci.loadavg[i]; 4083 } 4084 } else { 4085 return -1; 4086 } 4087 return nelem; 4088 } 4089 } 4090 4091 void os::pause() { 4092 char filename[MAX_PATH]; 4093 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4094 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4095 } else { 4096 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4097 } 4098 4099 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4100 if (fd != -1) { 4101 struct stat buf; 4102 ::close(fd); 4103 while (::stat(filename, &buf) == 0) { 4104 (void)::poll(NULL, 0, 100); 4105 } 4106 } else { 4107 trcVerbose("Could not open pause file '%s', continuing immediately.", filename); 4108 } 4109 } 4110 4111 bool os::is_primordial_thread(void) { 4112 if (pthread_self() == (pthread_t)1) { 4113 return true; 4114 } else { 4115 return false; 4116 } 4117 } 4118 4119 // OS recognitions (PASE/AIX, OS level) call this before calling any 4120 // one of Aix::on_pase(), Aix::os_version() static 4121 void os::Aix::initialize_os_info() { 4122 4123 assert(_on_pase == -1 && _os_version == 0, "already called."); 4124 4125 struct utsname uts; 4126 memset(&uts, 0, sizeof(uts)); 4127 strcpy(uts.sysname, "?"); 4128 if (::uname(&uts) == -1) { 4129 trcVerbose("uname failed (%d)", errno); 4130 guarantee(0, "Could not determine whether we run on AIX or PASE"); 4131 } else { 4132 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" " 4133 "node \"%s\" machine \"%s\"\n", 4134 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine); 4135 const int major = atoi(uts.version); 4136 assert(major > 0, "invalid OS version"); 4137 const int minor = atoi(uts.release); 4138 assert(minor > 0, "invalid OS release"); 4139 _os_version = (major << 24) | (minor << 16); 4140 char ver_str[20] = {0}; 4141 char *name_str = "unknown OS"; 4142 if (strcmp(uts.sysname, "OS400") == 0) { 4143 // We run on AS/400 PASE. We do not support versions older than V5R4M0. 4144 _on_pase = 1; 4145 if (os_version_short() < 0x0504) { 4146 trcVerbose("OS/400 releases older than V5R4M0 not supported."); 4147 assert(false, "OS/400 release too old."); 4148 } 4149 name_str = "OS/400 (pase)"; 4150 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor); 4151 } else if (strcmp(uts.sysname, "AIX") == 0) { 4152 // We run on AIX. We do not support versions older than AIX 5.3. 4153 _on_pase = 0; 4154 // Determine detailed AIX version: Version, Release, Modification, Fix Level. 4155 odmWrapper::determine_os_kernel_version(&_os_version); 4156 if (os_version_short() < 0x0503) { 4157 trcVerbose("AIX release older than AIX 5.3 not supported."); 4158 assert(false, "AIX release too old."); 4159 } 4160 name_str = "AIX"; 4161 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u", 4162 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF); 4163 } else { 4164 assert(false, name_str); 4165 } 4166 trcVerbose("We run on %s %s", name_str, ver_str); 4167 } 4168 4169 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release"); 4170 } // end: os::Aix::initialize_os_info() 4171 4172 // Scan environment for important settings which might effect the VM. 4173 // Trace out settings. Warn about invalid settings and/or correct them. 4174 // 4175 // Must run after os::Aix::initialue_os_info(). 4176 void os::Aix::scan_environment() { 4177 4178 char* p; 4179 int rc; 4180 4181 // Warn explicity if EXTSHM=ON is used. That switch changes how 4182 // System V shared memory behaves. One effect is that page size of 4183 // shared memory cannot be change dynamically, effectivly preventing 4184 // large pages from working. 4185 // This switch was needed on AIX 32bit, but on AIX 64bit the general 4186 // recommendation is (in OSS notes) to switch it off. 4187 p = ::getenv("EXTSHM"); 4188 trcVerbose("EXTSHM=%s.", p ? p : "<unset>"); 4189 if (p && strcasecmp(p, "ON") == 0) { 4190 _extshm = 1; 4191 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***"); 4192 if (!AllowExtshm) { 4193 // We allow under certain conditions the user to continue. However, we want this 4194 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means 4195 // that the VM is not able to allocate 64k pages for the heap. 4196 // We do not want to run with reduced performance. 4197 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment."); 4198 } 4199 } else { 4200 _extshm = 0; 4201 } 4202 4203 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs. 4204 // Not tested, not supported. 4205 // 4206 // Note that it might be worth the trouble to test and to require it, if only to 4207 // get useful return codes for mprotect. 4208 // 4209 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before 4210 // exec() ? before loading the libjvm ? ....) 4211 p = ::getenv("XPG_SUS_ENV"); 4212 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>"); 4213 if (p && strcmp(p, "ON") == 0) { 4214 _xpg_sus_mode = 1; 4215 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON"); 4216 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to 4217 // clobber address ranges. If we ever want to support that, we have to do some 4218 // testing first. 4219 guarantee(false, "XPG_SUS_ENV=ON not supported"); 4220 } else { 4221 _xpg_sus_mode = 0; 4222 } 4223 4224 if (os::Aix::on_pase()) { 4225 p = ::getenv("QIBM_MULTI_THREADED"); 4226 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>"); 4227 } 4228 4229 p = ::getenv("LDR_CNTRL"); 4230 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>"); 4231 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) { 4232 if (p && ::strstr(p, "TEXTPSIZE")) { 4233 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. " 4234 "you may experience hangs or crashes on OS/400 V7R1."); 4235 } 4236 } 4237 4238 p = ::getenv("AIXTHREAD_GUARDPAGES"); 4239 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>"); 4240 4241 } // end: os::Aix::scan_environment() 4242 4243 // PASE: initialize the libo4 library (PASE porting library). 4244 void os::Aix::initialize_libo4() { 4245 guarantee(os::Aix::on_pase(), "OS/400 only."); 4246 if (!libo4::init()) { 4247 trcVerbose("libo4 initialization failed."); 4248 assert(false, "libo4 initialization failed"); 4249 } else { 4250 trcVerbose("libo4 initialized."); 4251 } 4252 } 4253 4254 // AIX: initialize the libperfstat library. 4255 void os::Aix::initialize_libperfstat() { 4256 assert(os::Aix::on_aix(), "AIX only"); 4257 if (!libperfstat::init()) { 4258 trcVerbose("libperfstat initialization failed."); 4259 assert(false, "libperfstat initialization failed"); 4260 } else { 4261 trcVerbose("libperfstat initialized."); 4262 } 4263 } 4264 4265 ///////////////////////////////////////////////////////////////////////////// 4266 // thread stack 4267 4268 // Get the current stack base from the OS (actually, the pthread library). 4269 // Note: usually not page aligned. 4270 address os::current_stack_base() { 4271 AixMisc::stackbounds_t bounds; 4272 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4273 guarantee(rc, "Unable to retrieve stack bounds."); 4274 return bounds.base; 4275 } 4276 4277 // Get the current stack size from the OS (actually, the pthread library). 4278 // Returned size is such that (base - size) is always aligned to page size. 4279 size_t os::current_stack_size() { 4280 AixMisc::stackbounds_t bounds; 4281 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds); 4282 guarantee(rc, "Unable to retrieve stack bounds."); 4283 // Align the returned stack size such that the stack low address 4284 // is aligned to page size (Note: base is usually not and we do not care). 4285 // We need to do this because caller code will assume stack low address is 4286 // page aligned and will place guard pages without checking. 4287 address low = bounds.base - bounds.size; 4288 address low_aligned = (address)align_up(low, os::vm_page_size()); 4289 size_t s = bounds.base - low_aligned; 4290 return s; 4291 } 4292 4293 extern char** environ; 4294 4295 // Run the specified command in a separate process. Return its exit value, 4296 // or -1 on failure (e.g. can't fork a new process). 4297 // Unlike system(), this function can be called from signal handler. It 4298 // doesn't block SIGINT et al. 4299 int os::fork_and_exec(char* cmd) { 4300 char * argv[4] = {"sh", "-c", cmd, NULL}; 4301 4302 pid_t pid = fork(); 4303 4304 if (pid < 0) { 4305 // fork failed 4306 return -1; 4307 4308 } else if (pid == 0) { 4309 // child process 4310 4311 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX. 4312 execve("/usr/bin/sh", argv, environ); 4313 4314 // execve failed 4315 _exit(-1); 4316 4317 } else { 4318 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 4319 // care about the actual exit code, for now. 4320 4321 int status; 4322 4323 // Wait for the child process to exit. This returns immediately if 4324 // the child has already exited. */ 4325 while (waitpid(pid, &status, 0) < 0) { 4326 switch (errno) { 4327 case ECHILD: return 0; 4328 case EINTR: break; 4329 default: return -1; 4330 } 4331 } 4332 4333 if (WIFEXITED(status)) { 4334 // The child exited normally; get its exit code. 4335 return WEXITSTATUS(status); 4336 } else if (WIFSIGNALED(status)) { 4337 // The child exited because of a signal. 4338 // The best value to return is 0x80 + signal number, 4339 // because that is what all Unix shells do, and because 4340 // it allows callers to distinguish between process exit and 4341 // process death by signal. 4342 return 0x80 + WTERMSIG(status); 4343 } else { 4344 // Unknown exit code; pass it through. 4345 return status; 4346 } 4347 } 4348 return -1; 4349 } 4350 4351 // Get the default path to the core file 4352 // Returns the length of the string 4353 int os::get_core_path(char* buffer, size_t bufferSize) { 4354 const char* p = get_current_directory(buffer, bufferSize); 4355 4356 if (p == NULL) { 4357 assert(p != NULL, "failed to get current directory"); 4358 return 0; 4359 } 4360 4361 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 4362 p, current_process_id()); 4363 4364 return strlen(buffer); 4365 } 4366 4367 #ifndef PRODUCT 4368 void TestReserveMemorySpecial_test() { 4369 // No tests available for this platform 4370 } 4371 #endif 4372 4373 bool os::start_debugging(char *buf, int buflen) { 4374 int len = (int)strlen(buf); 4375 char *p = &buf[len]; 4376 4377 jio_snprintf(p, buflen -len, 4378 "\n\n" 4379 "Do you want to debug the problem?\n\n" 4380 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 4381 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 4382 "Otherwise, press RETURN to abort...", 4383 os::current_process_id(), 4384 os::current_thread_id(), thread_self()); 4385 4386 bool yes = os::message_box("Unexpected Error", buf); 4387 4388 if (yes) { 4389 // yes, user asked VM to launch debugger 4390 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 4391 4392 os::fork_and_exec(buf); 4393 yes = false; 4394 } 4395 return yes; 4396 } 4397 4398 static inline time_t get_mtime(const char* filename) { 4399 struct stat st; 4400 int ret = os::stat(filename, &st); 4401 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 4402 return st.st_mtime; 4403 } 4404 4405 int os::compare_file_modified_times(const char* file1, const char* file2) { 4406 time_t t1 = get_mtime(file1); 4407 time_t t2 = get_mtime(file2); 4408 return t1 - t2; 4409 }