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