1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "libo4.hpp"
41 #include "libperfstat_aix.hpp"
42 #include "libodm_aix.hpp"
43 #include "loadlib_aix.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "misc_aix.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "os_aix.inline.hpp"
49 #include "os_share_aix.hpp"
50 #include "porting_aix.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm_misc.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/extendedPC.hpp"
56 #include "runtime/globals.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/orderAccess.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_5_Compat
135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
136 #endif
137 #ifndef PV_6
138 #define PV_6 0x100000 /* Power PC 6 */
139 #endif
140 #ifndef PV_6_1
141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
142 #endif
143 #ifndef PV_6_Compat
144 #define PV_6_Compat 0x108000 /* Power PC 6 */
145 #endif
146 #ifndef PV_7
147 #define PV_7 0x200000 /* Power PC 7 */
148 #endif
149 #ifndef PV_7_Compat
150 #define PV_7_Compat 0x208000 /* Power PC 7 */
151 #endif
152 #ifndef PV_8
153 #define PV_8 0x300000 /* Power PC 8 */
154 #endif
155 #ifndef PV_8_Compat
156 #define PV_8_Compat 0x308000 /* Power PC 8 */
157 #endif
158
159 static address resolve_function_descriptor_to_code_pointer(address p);
160
161 static void vmembk_print_on(outputStream* os);
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // global variables (for a description see os_aix.hpp)
165
166 julong os::Aix::_physical_memory = 0;
167
168 pthread_t os::Aix::_main_thread = ((pthread_t)0);
169 int os::Aix::_page_size = -1;
170
171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
172 int os::Aix::_on_pase = -1;
173
174 // 0 = uninitialized, otherwise 32 bit number:
175 // 0xVVRRTTSS
176 // VV - major version
177 // RR - minor version
178 // TT - tech level, if known, 0 otherwise
179 // SS - service pack, if known, 0 otherwise
180 uint32_t os::Aix::_os_version = 0;
181
182 // -1 = uninitialized, 0 - no, 1 - yes
183 int os::Aix::_xpg_sus_mode = -1;
184
185 // -1 = uninitialized, 0 - no, 1 - yes
186 int os::Aix::_extshm = -1;
187
188 ////////////////////////////////////////////////////////////////////////////////
189 // local variables
190
191 static volatile jlong max_real_time = 0;
192 static jlong initial_time_count = 0;
193 static int clock_tics_per_sec = 100;
194 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
195 static bool check_signals = true;
196 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
197 static sigset_t SR_sigset;
198
199 // Process break recorded at startup.
200 static address g_brk_at_startup = NULL;
201
202 // This describes the state of multipage support of the underlying
203 // OS. Note that this is of no interest to the outsize world and
204 // therefore should not be defined in AIX class.
205 //
206 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
207 // latter two (16M "large" resp. 16G "huge" pages) require special
208 // setup and are normally not available.
209 //
210 // AIX supports multiple page sizes per process, for:
211 // - Stack (of the primordial thread, so not relevant for us)
212 // - Data - data, bss, heap, for us also pthread stacks
213 // - Text - text code
214 // - shared memory
215 //
216 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
217 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
218 //
219 // For shared memory, page size can be set dynamically via
220 // shmctl(). Different shared memory regions can have different page
221 // sizes.
222 //
223 // More information can be found at AIBM info center:
224 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
225 //
226 static struct {
227 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
228 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
229 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
230 size_t pthr_stack_pagesize; // stack page size of pthread threads
231 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
232 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
233 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
234 int error; // Error describing if something went wrong at multipage init.
235 } g_multipage_support = {
236 (size_t) -1,
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 (size_t) -1,
241 false, false,
242 0
243 };
244
245 // We must not accidentally allocate memory close to the BRK - even if
246 // that would work - because then we prevent the BRK segment from
247 // growing which may result in a malloc OOM even though there is
248 // enough memory. The problem only arises if we shmat() or mmap() at
249 // a specific wish address, e.g. to place the heap in a
250 // compressed-oops-friendly way.
251 static bool is_close_to_brk(address a) {
252 assert0(g_brk_at_startup != NULL);
253 if (a >= g_brk_at_startup &&
254 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
255 return true;
256 }
257 return false;
258 }
259
260 julong os::available_memory() {
261 return Aix::available_memory();
262 }
263
264 julong os::Aix::available_memory() {
265 // Avoid expensive API call here, as returned value will always be null.
266 if (os::Aix::on_pase()) {
267 return 0x0LL;
268 }
269 os::Aix::meminfo_t mi;
270 if (os::Aix::get_meminfo(&mi)) {
271 return mi.real_free;
272 } else {
273 return ULONG_MAX;
274 }
275 }
276
277 julong os::physical_memory() {
278 return Aix::physical_memory();
279 }
280
281 // Return true if user is running as root.
282
283 bool os::have_special_privileges() {
284 static bool init = false;
285 static bool privileges = false;
286 if (!init) {
287 privileges = (getuid() != geteuid()) || (getgid() != getegid());
288 init = true;
289 }
290 return privileges;
291 }
292
293 // Helper function, emulates disclaim64 using multiple 32bit disclaims
294 // because we cannot use disclaim64() on AS/400 and old AIX releases.
295 static bool my_disclaim64(char* addr, size_t size) {
296
297 if (size == 0) {
298 return true;
299 }
300
301 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
302 const unsigned int maxDisclaimSize = 0x40000000;
303
304 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
305 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
306
307 char* p = addr;
308
309 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
310 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
311 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
312 return false;
313 }
314 p += maxDisclaimSize;
315 }
316
317 if (lastDisclaimSize > 0) {
318 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
319 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
320 return false;
321 }
322 }
323
324 return true;
325 }
326
327 // Cpu architecture string
328 #if defined(PPC32)
329 static char cpu_arch[] = "ppc";
330 #elif defined(PPC64)
331 static char cpu_arch[] = "ppc64";
332 #else
333 #error Add appropriate cpu_arch setting
334 #endif
335
336 // Wrap the function "vmgetinfo" which is not available on older OS releases.
337 static int checked_vmgetinfo(void *out, int command, int arg) {
338 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
339 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
340 }
341 return ::vmgetinfo(out, command, arg);
342 }
343
344 // Given an address, returns the size of the page backing that address.
345 size_t os::Aix::query_pagesize(void* addr) {
346
347 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
348 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
349 return 4*K;
350 }
351
352 vm_page_info pi;
353 pi.addr = (uint64_t)addr;
354 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
355 return pi.pagesize;
356 } else {
357 assert(false, "vmgetinfo failed to retrieve page size");
358 return 4*K;
359 }
360 }
361
362 void os::Aix::initialize_system_info() {
363
364 // Get the number of online(logical) cpus instead of configured.
365 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
366 assert(_processor_count > 0, "_processor_count must be > 0");
367
368 // Retrieve total physical storage.
369 os::Aix::meminfo_t mi;
370 if (!os::Aix::get_meminfo(&mi)) {
371 assert(false, "os::Aix::get_meminfo failed.");
372 }
373 _physical_memory = (julong) mi.real_total;
374 }
375
376 // Helper function for tracing page sizes.
377 static const char* describe_pagesize(size_t pagesize) {
378 switch (pagesize) {
379 case 4*K : return "4K";
380 case 64*K: return "64K";
381 case 16*M: return "16M";
382 case 16*G: return "16G";
383 default:
384 assert(false, "surprise");
385 return "??";
386 }
387 }
388
389 // Probe OS for multipage support.
390 // Will fill the global g_multipage_support structure.
391 // Must be called before calling os::large_page_init().
392 static void query_multipage_support() {
393
394 guarantee(g_multipage_support.pagesize == -1,
395 "do not call twice");
396
397 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
398
399 // This really would surprise me.
400 assert(g_multipage_support.pagesize == 4*K, "surprise!");
401
402 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
403 // Default data page size is defined either by linker options (-bdatapsize)
404 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
405 // default should be 4K.
406 {
407 void* p = ::malloc(16*M);
408 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
409 ::free(p);
410 }
411
412 // Query default shm page size (LDR_CNTRL SHMPSIZE).
413 // Note that this is pure curiosity. We do not rely on default page size but set
414 // our own page size after allocated.
415 {
416 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
417 guarantee(shmid != -1, "shmget failed");
418 void* p = ::shmat(shmid, NULL, 0);
419 ::shmctl(shmid, IPC_RMID, NULL);
420 guarantee(p != (void*) -1, "shmat failed");
421 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
422 ::shmdt(p);
423 }
424
425 // Before querying the stack page size, make sure we are not running as primordial
426 // thread (because primordial thread's stack may have different page size than
427 // pthread thread stacks). Running a VM on the primordial thread won't work for a
428 // number of reasons so we may just as well guarantee it here.
429 guarantee0(!os::is_primordial_thread());
430
431 // Query pthread stack page size. Should be the same as data page size because
432 // pthread stacks are allocated from C-Heap.
433 {
434 int dummy = 0;
435 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
436 }
437
438 // Query default text page size (LDR_CNTRL TEXTPSIZE).
439 {
440 address any_function =
441 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
442 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
443 }
444
445 // Now probe for support of 64K pages and 16M pages.
446
447 // Before OS/400 V6R1, there is no support for pages other than 4K.
448 if (os::Aix::on_pase_V5R4_or_older()) {
449 trcVerbose("OS/400 < V6R1 - no large page support.");
450 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
451 goto query_multipage_support_end;
452 }
453
454 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
455 {
456 const int MAX_PAGE_SIZES = 4;
457 psize_t sizes[MAX_PAGE_SIZES];
458 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
459 if (num_psizes == -1) {
460 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
461 trcVerbose("disabling multipage support.");
462 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
463 goto query_multipage_support_end;
464 }
465 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
466 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
467 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
468 for (int i = 0; i < num_psizes; i ++) {
469 trcVerbose(" %s ", describe_pagesize(sizes[i]));
470 }
471
472 // Can we use 64K, 16M pages?
473 for (int i = 0; i < num_psizes; i ++) {
474 const size_t pagesize = sizes[i];
475 if (pagesize != 64*K && pagesize != 16*M) {
476 continue;
477 }
478 bool can_use = false;
479 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
480 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
481 IPC_CREAT | S_IRUSR | S_IWUSR);
482 guarantee0(shmid != -1); // Should always work.
483 // Try to set pagesize.
484 struct shmid_ds shm_buf = { 0 };
485 shm_buf.shm_pagesize = pagesize;
486 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
487 const int en = errno;
488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
489 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
490 errno);
491 } else {
492 // Attach and double check pageisze.
493 void* p = ::shmat(shmid, NULL, 0);
494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
495 guarantee0(p != (void*) -1); // Should always work.
496 const size_t real_pagesize = os::Aix::query_pagesize(p);
497 if (real_pagesize != pagesize) {
498 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
499 } else {
500 can_use = true;
501 }
502 ::shmdt(p);
503 }
504 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
505 if (pagesize == 64*K) {
506 g_multipage_support.can_use_64K_pages = can_use;
507 } else if (pagesize == 16*M) {
508 g_multipage_support.can_use_16M_pages = can_use;
509 }
510 }
511
512 } // end: check which pages can be used for shared memory
513
514 query_multipage_support_end:
515
516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
517 describe_pagesize(g_multipage_support.pagesize));
518 trcVerbose("Data page size (C-Heap, bss, etc): %s",
519 describe_pagesize(g_multipage_support.datapsize));
520 trcVerbose("Text page size: %s",
521 describe_pagesize(g_multipage_support.textpsize));
522 trcVerbose("Thread stack page size (pthread): %s",
523 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
524 trcVerbose("Default shared memory page size: %s",
525 describe_pagesize(g_multipage_support.shmpsize));
526 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
527 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
528 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
529 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
530 trcVerbose("Multipage error details: %d",
531 g_multipage_support.error);
532
533 // sanity checks
534 assert0(g_multipage_support.pagesize == 4*K);
535 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
536 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
537 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
538 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
539
540 }
541
542 void os::init_system_properties_values() {
543
544 #define DEFAULT_LIBPATH "/lib:/usr/lib"
545 #define EXTENSIONS_DIR "/lib/ext"
546
547 // Buffer that fits several sprintfs.
548 // Note that the space for the trailing null is provided
549 // by the nulls included by the sizeof operator.
550 const size_t bufsize =
551 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
554
555 // sysclasspath, java_home, dll_dir
556 {
557 char *pslash;
558 os::jvm_path(buf, bufsize);
559
560 // Found the full path to libjvm.so.
561 // Now cut the path to <java_home>/jre if we can.
562 pslash = strrchr(buf, '/');
563 if (pslash != NULL) {
564 *pslash = '\0'; // Get rid of /libjvm.so.
565 }
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
569 }
570 Arguments::set_dll_dir(buf);
571
572 if (pslash != NULL) {
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /lib.
576 }
577 }
578 Arguments::set_java_home(buf);
579 if (!set_boot_path('/', ':')) {
580 vm_exit_during_initialization("Failed setting boot class path.", NULL);
581 }
582 }
583
584 // Where to look for native libraries.
585
586 // On Aix we get the user setting of LIBPATH.
587 // Eventually, all the library path setting will be done here.
588 // Get the user setting of LIBPATH.
589 const char *v = ::getenv("LIBPATH");
590 const char *v_colon = ":";
591 if (v == NULL) { v = ""; v_colon = ""; }
592
593 // Concatenate user and invariant part of ld_library_path.
594 // That's +1 for the colon and +1 for the trailing '\0'.
595 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
596 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
597 Arguments::set_library_path(ld_library_path);
598 FREE_C_HEAP_ARRAY(char, ld_library_path);
599
600 // Extensions directories.
601 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
602 Arguments::set_ext_dirs(buf);
603
604 FREE_C_HEAP_ARRAY(char, buf);
605
606 #undef DEFAULT_LIBPATH
607 #undef EXTENSIONS_DIR
608 }
609
610 ////////////////////////////////////////////////////////////////////////////////
611 // breakpoint support
612
613 void os::breakpoint() {
614 BREAKPOINT;
615 }
616
617 extern "C" void breakpoint() {
618 // use debugger to set breakpoint here
619 }
620
621 ////////////////////////////////////////////////////////////////////////////////
622 // signal support
623
624 debug_only(static bool signal_sets_initialized = false);
625 static sigset_t unblocked_sigs, vm_sigs;
626
627 void os::Aix::signal_sets_init() {
628 // Should also have an assertion stating we are still single-threaded.
629 assert(!signal_sets_initialized, "Already initialized");
630 // Fill in signals that are necessarily unblocked for all threads in
631 // the VM. Currently, we unblock the following signals:
632 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
633 // by -Xrs (=ReduceSignalUsage));
634 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
635 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
636 // the dispositions or masks wrt these signals.
637 // Programs embedding the VM that want to use the above signals for their
638 // own purposes must, at this time, use the "-Xrs" option to prevent
639 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
640 // (See bug 4345157, and other related bugs).
641 // In reality, though, unblocking these signals is really a nop, since
642 // these signals are not blocked by default.
643 sigemptyset(&unblocked_sigs);
644 sigaddset(&unblocked_sigs, SIGILL);
645 sigaddset(&unblocked_sigs, SIGSEGV);
646 sigaddset(&unblocked_sigs, SIGBUS);
647 sigaddset(&unblocked_sigs, SIGFPE);
648 sigaddset(&unblocked_sigs, SIGTRAP);
649 sigaddset(&unblocked_sigs, SR_signum);
650
651 if (!ReduceSignalUsage) {
652 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
653 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
654 }
655 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
656 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
657 }
658 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
659 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
660 }
661 }
662 // Fill in signals that are blocked by all but the VM thread.
663 sigemptyset(&vm_sigs);
664 if (!ReduceSignalUsage)
665 sigaddset(&vm_sigs, BREAK_SIGNAL);
666 debug_only(signal_sets_initialized = true);
667 }
668
669 // These are signals that are unblocked while a thread is running Java.
670 // (For some reason, they get blocked by default.)
671 sigset_t* os::Aix::unblocked_signals() {
672 assert(signal_sets_initialized, "Not initialized");
673 return &unblocked_sigs;
674 }
675
676 // These are the signals that are blocked while a (non-VM) thread is
677 // running Java. Only the VM thread handles these signals.
678 sigset_t* os::Aix::vm_signals() {
679 assert(signal_sets_initialized, "Not initialized");
680 return &vm_sigs;
681 }
682
683 void os::Aix::hotspot_sigmask(Thread* thread) {
684
685 //Save caller's signal mask before setting VM signal mask
686 sigset_t caller_sigmask;
687 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
688
689 OSThread* osthread = thread->osthread();
690 osthread->set_caller_sigmask(caller_sigmask);
691
692 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
693
694 if (!ReduceSignalUsage) {
695 if (thread->is_VM_thread()) {
696 // Only the VM thread handles BREAK_SIGNAL ...
697 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
698 } else {
699 // ... all other threads block BREAK_SIGNAL
700 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
701 }
702 }
703 }
704
705 // retrieve memory information.
706 // Returns false if something went wrong;
707 // content of pmi undefined in this case.
708 bool os::Aix::get_meminfo(meminfo_t* pmi) {
709
710 assert(pmi, "get_meminfo: invalid parameter");
711
712 memset(pmi, 0, sizeof(meminfo_t));
713
714 if (os::Aix::on_pase()) {
715 // On PASE, use the libo4 porting library.
716
717 unsigned long long virt_total = 0;
718 unsigned long long real_total = 0;
719 unsigned long long real_free = 0;
720 unsigned long long pgsp_total = 0;
721 unsigned long long pgsp_free = 0;
722 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
723 pmi->virt_total = virt_total;
724 pmi->real_total = real_total;
725 pmi->real_free = real_free;
726 pmi->pgsp_total = pgsp_total;
727 pmi->pgsp_free = pgsp_free;
728 return true;
729 }
730 return false;
731
732 } else {
733
734 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
735 // See:
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
738 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
739 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
740
741 perfstat_memory_total_t psmt;
742 memset (&psmt, '\0', sizeof(psmt));
743 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
744 if (rc == -1) {
745 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
746 assert(0, "perfstat_memory_total() failed");
747 return false;
748 }
749
750 assert(rc == 1, "perfstat_memory_total() - weird return code");
751
752 // excerpt from
753 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
754 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
755 // The fields of perfstat_memory_total_t:
756 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
757 // u_longlong_t real_total Total real memory (in 4 KB pages).
758 // u_longlong_t real_free Free real memory (in 4 KB pages).
759 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
760 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
761
762 pmi->virt_total = psmt.virt_total * 4096;
763 pmi->real_total = psmt.real_total * 4096;
764 pmi->real_free = psmt.real_free * 4096;
765 pmi->pgsp_total = psmt.pgsp_total * 4096;
766 pmi->pgsp_free = psmt.pgsp_free * 4096;
767
768 return true;
769
770 }
771 } // end os::Aix::get_meminfo
772
773 //////////////////////////////////////////////////////////////////////////////
774 // create new thread
775
776 // Thread start routine for all newly created threads
777 static void *thread_native_entry(Thread *thread) {
778
779 thread->record_stack_base_and_size();
780
781 const pthread_t pthread_id = ::pthread_self();
782 const tid_t kernel_thread_id = ::thread_self();
783
784 LogTarget(Info, os, thread) lt;
785 if (lt.is_enabled()) {
786 address low_address = thread->stack_end();
787 address high_address = thread->stack_base();
788 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
789 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
790 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
791 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
792 }
793
794 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
795 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
796 // tools hook pthread_create(). In this case, we may run into problems establishing
797 // guard pages on those stacks, because the stacks may reside in memory which is not
798 // protectable (shmated).
799 if (thread->stack_base() > ::sbrk(0)) {
800 log_warning(os, thread)("Thread stack not in data segment.");
801 }
802
803 // Try to randomize the cache line index of hot stack frames.
804 // This helps when threads of the same stack traces evict each other's
805 // cache lines. The threads can be either from the same JVM instance, or
806 // from different JVM instances. The benefit is especially true for
807 // processors with hyperthreading technology.
808
809 static int counter = 0;
810 int pid = os::current_process_id();
811 alloca(((pid ^ counter++) & 7) * 128);
812
813 thread->initialize_thread_current();
814
815 OSThread* osthread = thread->osthread();
816
817 // Thread_id is pthread id.
818 osthread->set_thread_id(pthread_id);
819
820 // .. but keep kernel thread id too for diagnostics
821 osthread->set_kernel_thread_id(kernel_thread_id);
822
823 // Initialize signal mask for this thread.
824 os::Aix::hotspot_sigmask(thread);
825
826 // Initialize floating point control register.
827 os::Aix::init_thread_fpu_state();
828
829 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
830
831 // Call one more level start routine.
832 thread->call_run();
833
834 // Note: at this point the thread object may already have deleted itself.
835 // Prevent dereferencing it from here on out.
836 thread = NULL;
837
838 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
839 os::current_thread_id(), (uintx) kernel_thread_id);
840
841 return 0;
842 }
843
844 bool os::create_thread(Thread* thread, ThreadType thr_type,
845 size_t req_stack_size) {
846
847 assert(thread->osthread() == NULL, "caller responsible");
848
849 // Allocate the OSThread object.
850 OSThread* osthread = new OSThread(NULL, NULL);
851 if (osthread == NULL) {
852 return false;
853 }
854
855 // Set the correct thread state.
856 osthread->set_thread_type(thr_type);
857
858 // Initial state is ALLOCATED but not INITIALIZED
859 osthread->set_state(ALLOCATED);
860
861 thread->set_osthread(osthread);
862
863 // Init thread attributes.
864 pthread_attr_t attr;
865 pthread_attr_init(&attr);
866 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
867
868 // Make sure we run in 1:1 kernel-user-thread mode.
869 if (os::Aix::on_aix()) {
870 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
871 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
872 }
873
874 // Start in suspended state, and in os::thread_start, wake the thread up.
875 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
876
877 // Calculate stack size if it's not specified by caller.
878 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
879
880 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
881 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
882 // This very much looks like a pthread lib error. As a workaround, increase the stack size
883 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
884 if (stack_size < 4096 * K) {
885 stack_size += 64 * K;
886 }
887
888 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
889 // thread size in attr unchanged. If this is the minimal stack size as set
890 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
891 // guard pages might not fit on the tiny stack created.
892 int ret = pthread_attr_setstacksize(&attr, stack_size);
893 if (ret != 0) {
894 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
895 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
896 stack_size / K);
897 thread->set_osthread(NULL);
898 delete osthread;
899 return false;
900 }
901
902 // Save some cycles and a page by disabling OS guard pages where we have our own
903 // VM guard pages (in java threads). For other threads, keep system default guard
904 // pages in place.
905 if (thr_type == java_thread || thr_type == compiler_thread) {
906 ret = pthread_attr_setguardsize(&attr, 0);
907 }
908
909 pthread_t tid = 0;
910 if (ret == 0) {
911 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
912 }
913
914 if (ret == 0) {
915 char buf[64];
916 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
917 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
918 } else {
919 char buf[64];
920 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
921 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
922 }
923
924 pthread_attr_destroy(&attr);
925
926 if (ret != 0) {
927 // Need to clean up stuff we've allocated so far.
928 thread->set_osthread(NULL);
929 delete osthread;
930 return false;
931 }
932
933 // OSThread::thread_id is the pthread id.
934 osthread->set_thread_id(tid);
935
936 return true;
937 }
938
939 /////////////////////////////////////////////////////////////////////////////
940 // attach existing thread
941
942 // bootstrap the main thread
943 bool os::create_main_thread(JavaThread* thread) {
944 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
945 return create_attached_thread(thread);
946 }
947
948 bool os::create_attached_thread(JavaThread* thread) {
949 #ifdef ASSERT
950 thread->verify_not_published();
951 #endif
952
953 // Allocate the OSThread object
954 OSThread* osthread = new OSThread(NULL, NULL);
955
956 if (osthread == NULL) {
957 return false;
958 }
959
960 const pthread_t pthread_id = ::pthread_self();
961 const tid_t kernel_thread_id = ::thread_self();
962
963 // OSThread::thread_id is the pthread id.
964 osthread->set_thread_id(pthread_id);
965
966 // .. but keep kernel thread id too for diagnostics
967 osthread->set_kernel_thread_id(kernel_thread_id);
968
969 // initialize floating point control register
970 os::Aix::init_thread_fpu_state();
971
972 // Initial thread state is RUNNABLE
973 osthread->set_state(RUNNABLE);
974
975 thread->set_osthread(osthread);
976
977 if (UseNUMA) {
978 int lgrp_id = os::numa_get_group_id();
979 if (lgrp_id != -1) {
980 thread->set_lgrp_id(lgrp_id);
981 }
982 }
983
984 // initialize signal mask for this thread
985 // and save the caller's signal mask
986 os::Aix::hotspot_sigmask(thread);
987
988 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
989 os::current_thread_id(), (uintx) kernel_thread_id);
990
991 return true;
992 }
993
994 void os::pd_start_thread(Thread* thread) {
995 int status = pthread_continue_np(thread->osthread()->pthread_id());
996 assert(status == 0, "thr_continue failed");
997 }
998
999 // Free OS resources related to the OSThread
1000 void os::free_thread(OSThread* osthread) {
1001 assert(osthread != NULL, "osthread not set");
1002
1003 // We are told to free resources of the argument thread,
1004 // but we can only really operate on the current thread.
1005 assert(Thread::current()->osthread() == osthread,
1006 "os::free_thread but not current thread");
1007
1008 // Restore caller's signal mask
1009 sigset_t sigmask = osthread->caller_sigmask();
1010 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1011
1012 delete osthread;
1013 }
1014
1015 ////////////////////////////////////////////////////////////////////////////////
1016 // time support
1017
1018 // Time since start-up in seconds to a fine granularity.
1019 // Used by VMSelfDestructTimer and the MemProfiler.
1020 double os::elapsedTime() {
1021 return (double)(os::elapsed_counter()) * 0.000001;
1022 }
1023
1024 jlong os::elapsed_counter() {
1025 timeval time;
1026 int status = gettimeofday(&time, NULL);
1027 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1028 }
1029
1030 jlong os::elapsed_frequency() {
1031 return (1000 * 1000);
1032 }
1033
1034 bool os::supports_vtime() { return true; }
1035 bool os::enable_vtime() { return false; }
1036 bool os::vtime_enabled() { return false; }
1037
1038 double os::elapsedVTime() {
1039 struct rusage usage;
1040 int retval = getrusage(RUSAGE_THREAD, &usage);
1041 if (retval == 0) {
1042 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1043 } else {
1044 // better than nothing, but not much
1045 return elapsedTime();
1046 }
1047 }
1048
1049 jlong os::javaTimeMillis() {
1050 timeval time;
1051 int status = gettimeofday(&time, NULL);
1052 assert(status != -1, "aix error at gettimeofday()");
1053 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1054 }
1055
1056 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1057 timeval time;
1058 int status = gettimeofday(&time, NULL);
1059 assert(status != -1, "aix error at gettimeofday()");
1060 seconds = jlong(time.tv_sec);
1061 nanos = jlong(time.tv_usec) * 1000;
1062 }
1063
1064 // We use mread_real_time here.
1065 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1066 // it has to be converted to real time. AIX documentations suggests to do
1067 // this unconditionally, so we do it.
1068 //
1069 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1070 //
1071 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1072 // conversion is necessary. However, mread_real_time will not return
1073 // monotonic results but merely matches read_real_time. So we need a tweak
1074 // to ensure monotonic results.
1075 //
1076 // For PASE no public documentation exists, just word by IBM
1077 jlong os::javaTimeNanos() {
1078 timebasestruct_t time;
1079 int rc = mread_real_time(&time, TIMEBASE_SZ);
1080 if (os::Aix::on_pase()) {
1081 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1082 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1083 jlong prev = max_real_time;
1084 if (now <= prev) {
1085 return prev; // same or retrograde time;
1086 }
1087 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1088 assert(obsv >= prev, "invariant"); // Monotonicity
1089 // If the CAS succeeded then we're done and return "now".
1090 // If the CAS failed and the observed value "obsv" is >= now then
1091 // we should return "obsv". If the CAS failed and now > obsv > prv then
1092 // some other thread raced this thread and installed a new value, in which case
1093 // we could either (a) retry the entire operation, (b) retry trying to install now
1094 // or (c) just return obsv. We use (c). No loop is required although in some cases
1095 // we might discard a higher "now" value in deference to a slightly lower but freshly
1096 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1097 // to (a) or (b) -- and greatly reduces coherence traffic.
1098 // We might also condition (c) on the magnitude of the delta between obsv and now.
1099 // Avoiding excessive CAS operations to hot RW locations is critical.
1100 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1101 return (prev == obsv) ? now : obsv;
1102 } else {
1103 if (rc != RTC_POWER) {
1104 rc = time_base_to_time(&time, TIMEBASE_SZ);
1105 assert(rc != -1, "error calling time_base_to_time()");
1106 }
1107 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1108 }
1109 }
1110
1111 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1112 info_ptr->max_value = ALL_64_BITS;
1113 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1114 info_ptr->may_skip_backward = false;
1115 info_ptr->may_skip_forward = false;
1116 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1117 }
1118
1119 // Return the real, user, and system times in seconds from an
1120 // arbitrary fixed point in the past.
1121 bool os::getTimesSecs(double* process_real_time,
1122 double* process_user_time,
1123 double* process_system_time) {
1124 struct tms ticks;
1125 clock_t real_ticks = times(&ticks);
1126
1127 if (real_ticks == (clock_t) (-1)) {
1128 return false;
1129 } else {
1130 double ticks_per_second = (double) clock_tics_per_sec;
1131 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1132 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1133 *process_real_time = ((double) real_ticks) / ticks_per_second;
1134
1135 return true;
1136 }
1137 }
1138
1139 char * os::local_time_string(char *buf, size_t buflen) {
1140 struct tm t;
1141 time_t long_time;
1142 time(&long_time);
1143 localtime_r(&long_time, &t);
1144 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1145 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1146 t.tm_hour, t.tm_min, t.tm_sec);
1147 return buf;
1148 }
1149
1150 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1151 return localtime_r(clock, res);
1152 }
1153
1154 ////////////////////////////////////////////////////////////////////////////////
1155 // runtime exit support
1156
1157 // Note: os::shutdown() might be called very early during initialization, or
1158 // called from signal handler. Before adding something to os::shutdown(), make
1159 // sure it is async-safe and can handle partially initialized VM.
1160 void os::shutdown() {
1161
1162 // allow PerfMemory to attempt cleanup of any persistent resources
1163 perfMemory_exit();
1164
1165 // needs to remove object in file system
1166 AttachListener::abort();
1167
1168 // flush buffered output, finish log files
1169 ostream_abort();
1170
1171 // Check for abort hook
1172 abort_hook_t abort_hook = Arguments::abort_hook();
1173 if (abort_hook != NULL) {
1174 abort_hook();
1175 }
1176 }
1177
1178 // Note: os::abort() might be called very early during initialization, or
1179 // called from signal handler. Before adding something to os::abort(), make
1180 // sure it is async-safe and can handle partially initialized VM.
1181 void os::abort(bool dump_core, void* siginfo, const void* context) {
1182 os::shutdown();
1183 if (dump_core) {
1184 #ifndef PRODUCT
1185 fdStream out(defaultStream::output_fd());
1186 out.print_raw("Current thread is ");
1187 char buf[16];
1188 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1189 out.print_raw_cr(buf);
1190 out.print_raw_cr("Dumping core ...");
1191 #endif
1192 ::abort(); // dump core
1193 }
1194
1195 ::exit(1);
1196 }
1197
1198 // Die immediately, no exit hook, no abort hook, no cleanup.
1199 void os::die() {
1200 ::abort();
1201 }
1202
1203 intx os::current_thread_id() {
1204 return (intx)pthread_self();
1205 }
1206
1207 int os::current_process_id() {
1208 return getpid();
1209 }
1210
1211 // DLL functions
1212
1213 const char* os::dll_file_extension() { return ".so"; }
1214
1215 // This must be hard coded because it's the system's temporary
1216 // directory not the java application's temp directory, ala java.io.tmpdir.
1217 const char* os::get_temp_directory() { return "/tmp"; }
1218
1219 // Check if addr is inside libjvm.so.
1220 bool os::address_is_in_vm(address addr) {
1221
1222 // Input could be a real pc or a function pointer literal. The latter
1223 // would be a function descriptor residing in the data segment of a module.
1224 loaded_module_t lm;
1225 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1226 return lm.is_in_vm;
1227 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1228 return lm.is_in_vm;
1229 } else {
1230 return false;
1231 }
1232
1233 }
1234
1235 // Resolve an AIX function descriptor literal to a code pointer.
1236 // If the input is a valid code pointer to a text segment of a loaded module,
1237 // it is returned unchanged.
1238 // If the input is a valid AIX function descriptor, it is resolved to the
1239 // code entry point.
1240 // If the input is neither a valid function descriptor nor a valid code pointer,
1241 // NULL is returned.
1242 static address resolve_function_descriptor_to_code_pointer(address p) {
1243
1244 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1245 // It is a real code pointer.
1246 return p;
1247 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1248 // Pointer to data segment, potential function descriptor.
1249 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1250 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1251 // It is a function descriptor.
1252 return code_entry;
1253 }
1254 }
1255
1256 return NULL;
1257 }
1258
1259 bool os::dll_address_to_function_name(address addr, char *buf,
1260 int buflen, int *offset,
1261 bool demangle) {
1262 if (offset) {
1263 *offset = -1;
1264 }
1265 // Buf is not optional, but offset is optional.
1266 assert(buf != NULL, "sanity check");
1267 buf[0] = '\0';
1268
1269 // Resolve function ptr literals first.
1270 addr = resolve_function_descriptor_to_code_pointer(addr);
1271 if (!addr) {
1272 return false;
1273 }
1274
1275 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1276 }
1277
1278 bool os::dll_address_to_library_name(address addr, char* buf,
1279 int buflen, int* offset) {
1280 if (offset) {
1281 *offset = -1;
1282 }
1283 // Buf is not optional, but offset is optional.
1284 assert(buf != NULL, "sanity check");
1285 buf[0] = '\0';
1286
1287 // Resolve function ptr literals first.
1288 addr = resolve_function_descriptor_to_code_pointer(addr);
1289 if (!addr) {
1290 return false;
1291 }
1292
1293 return AixSymbols::get_module_name(addr, buf, buflen);
1294 }
1295
1296 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1297 // for the same architecture as Hotspot is running on.
1298 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1299
1300 if (ebuf && ebuflen > 0) {
1301 ebuf[0] = '\0';
1302 ebuf[ebuflen - 1] = '\0';
1303 }
1304
1305 if (!filename || strlen(filename) == 0) {
1306 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1307 return NULL;
1308 }
1309
1310 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1311 void * result= ::dlopen(filename, RTLD_LAZY);
1312 if (result != NULL) {
1313 // Reload dll cache. Don't do this in signal handling.
1314 LoadedLibraries::reload();
1315 return result;
1316 } else {
1317 // error analysis when dlopen fails
1318 const char* const error_report = ::dlerror();
1319 if (error_report && ebuf && ebuflen > 0) {
1320 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1321 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1322 }
1323 }
1324 return NULL;
1325 }
1326
1327 void* os::dll_lookup(void* handle, const char* name) {
1328 void* res = dlsym(handle, name);
1329 return res;
1330 }
1331
1332 void* os::get_default_process_handle() {
1333 return (void*)::dlopen(NULL, RTLD_LAZY);
1334 }
1335
1336 void os::print_dll_info(outputStream *st) {
1337 st->print_cr("Dynamic libraries:");
1338 LoadedLibraries::print(st);
1339 }
1340
1341 void os::get_summary_os_info(char* buf, size_t buflen) {
1342 // There might be something more readable than uname results for AIX.
1343 struct utsname name;
1344 uname(&name);
1345 snprintf(buf, buflen, "%s %s", name.release, name.version);
1346 }
1347
1348 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1349 // Not yet implemented.
1350 return 0;
1351 }
1352
1353 void os::print_os_info_brief(outputStream* st) {
1354 uint32_t ver = os::Aix::os_version();
1355 st->print_cr("AIX kernel version %u.%u.%u.%u",
1356 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1357
1358 os::Posix::print_uname_info(st);
1359
1360 // Linux uses print_libversion_info(st); here.
1361 }
1362
1363 void os::print_os_info(outputStream* st) {
1364 st->print("OS:");
1365
1366 st->print("uname:");
1367 struct utsname name;
1368 uname(&name);
1369 st->print(name.sysname); st->print(" ");
1370 st->print(name.nodename); st->print(" ");
1371 st->print(name.release); st->print(" ");
1372 st->print(name.version); st->print(" ");
1373 st->print(name.machine);
1374 st->cr();
1375
1376 uint32_t ver = os::Aix::os_version();
1377 st->print_cr("AIX kernel version %u.%u.%u.%u",
1378 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1379
1380 os::Posix::print_rlimit_info(st);
1381
1382 // load average
1383 st->print("load average:");
1384 double loadavg[3] = {-1.L, -1.L, -1.L};
1385 os::loadavg(loadavg, 3);
1386 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1387 st->cr();
1388
1389 // print wpar info
1390 libperfstat::wparinfo_t wi;
1391 if (libperfstat::get_wparinfo(&wi)) {
1392 st->print_cr("wpar info");
1393 st->print_cr("name: %s", wi.name);
1394 st->print_cr("id: %d", wi.wpar_id);
1395 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1396 }
1397
1398 // print partition info
1399 libperfstat::partitioninfo_t pi;
1400 if (libperfstat::get_partitioninfo(&pi)) {
1401 st->print_cr("partition info");
1402 st->print_cr(" name: %s", pi.name);
1403 }
1404
1405 }
1406
1407 void os::print_memory_info(outputStream* st) {
1408
1409 st->print_cr("Memory:");
1410
1411 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1412 describe_pagesize(g_multipage_support.pagesize));
1413 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1414 describe_pagesize(g_multipage_support.datapsize));
1415 st->print_cr(" Text page size: %s",
1416 describe_pagesize(g_multipage_support.textpsize));
1417 st->print_cr(" Thread stack page size (pthread): %s",
1418 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1419 st->print_cr(" Default shared memory page size: %s",
1420 describe_pagesize(g_multipage_support.shmpsize));
1421 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1422 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1423 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1424 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1425 st->print_cr(" Multipage error: %d",
1426 g_multipage_support.error);
1427 st->cr();
1428 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1429
1430 // print out LDR_CNTRL because it affects the default page sizes
1431 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1432 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1433
1434 // Print out EXTSHM because it is an unsupported setting.
1435 const char* const extshm = ::getenv("EXTSHM");
1436 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1437 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1438 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1439 }
1440
1441 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1442 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1443 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1444 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1445 st->cr();
1446
1447 os::Aix::meminfo_t mi;
1448 if (os::Aix::get_meminfo(&mi)) {
1449 if (os::Aix::on_aix()) {
1450 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1451 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1452 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1453 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1454 } else {
1455 // PASE - Numbers are result of QWCRSSTS; they mean:
1456 // real_total: Sum of all system pools
1457 // real_free: always 0
1458 // pgsp_total: we take the size of the system ASP
1459 // pgsp_free: size of system ASP times percentage of system ASP unused
1460 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1461 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1462 st->print_cr("%% system asp used : %.2f",
1463 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1464 }
1465 }
1466 st->cr();
1467
1468 // Print program break.
1469 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1470 address brk_now = (address)::sbrk(0);
1471 if (brk_now != (address)-1) {
1472 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1473 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1474 }
1475 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1476 st->cr();
1477
1478 // Print segments allocated with os::reserve_memory.
1479 st->print_cr("internal virtual memory regions used by vm:");
1480 vmembk_print_on(st);
1481 }
1482
1483 // Get a string for the cpuinfo that is a summary of the cpu type
1484 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1485 // read _system_configuration.version
1486 switch (_system_configuration.version) {
1487 case PV_8:
1488 strncpy(buf, "Power PC 8", buflen);
1489 break;
1490 case PV_7:
1491 strncpy(buf, "Power PC 7", buflen);
1492 break;
1493 case PV_6_1:
1494 strncpy(buf, "Power PC 6 DD1.x", buflen);
1495 break;
1496 case PV_6:
1497 strncpy(buf, "Power PC 6", buflen);
1498 break;
1499 case PV_5:
1500 strncpy(buf, "Power PC 5", buflen);
1501 break;
1502 case PV_5_2:
1503 strncpy(buf, "Power PC 5_2", buflen);
1504 break;
1505 case PV_5_3:
1506 strncpy(buf, "Power PC 5_3", buflen);
1507 break;
1508 case PV_5_Compat:
1509 strncpy(buf, "PV_5_Compat", buflen);
1510 break;
1511 case PV_6_Compat:
1512 strncpy(buf, "PV_6_Compat", buflen);
1513 break;
1514 case PV_7_Compat:
1515 strncpy(buf, "PV_7_Compat", buflen);
1516 break;
1517 case PV_8_Compat:
1518 strncpy(buf, "PV_8_Compat", buflen);
1519 break;
1520 default:
1521 strncpy(buf, "unknown", buflen);
1522 }
1523 }
1524
1525 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1526 // Nothing to do beyond of what os::print_cpu_info() does.
1527 }
1528
1529 static void print_signal_handler(outputStream* st, int sig,
1530 char* buf, size_t buflen);
1531
1532 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1533 st->print_cr("Signal Handlers:");
1534 print_signal_handler(st, SIGSEGV, buf, buflen);
1535 print_signal_handler(st, SIGBUS , buf, buflen);
1536 print_signal_handler(st, SIGFPE , buf, buflen);
1537 print_signal_handler(st, SIGPIPE, buf, buflen);
1538 print_signal_handler(st, SIGXFSZ, buf, buflen);
1539 print_signal_handler(st, SIGILL , buf, buflen);
1540 print_signal_handler(st, SR_signum, buf, buflen);
1541 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1542 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1543 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1544 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1545 print_signal_handler(st, SIGTRAP, buf, buflen);
1546 // We also want to know if someone else adds a SIGDANGER handler because
1547 // that will interfere with OOM killling.
1548 print_signal_handler(st, SIGDANGER, buf, buflen);
1549 }
1550
1551 static char saved_jvm_path[MAXPATHLEN] = {0};
1552
1553 // Find the full path to the current module, libjvm.so.
1554 void os::jvm_path(char *buf, jint buflen) {
1555 // Error checking.
1556 if (buflen < MAXPATHLEN) {
1557 assert(false, "must use a large-enough buffer");
1558 buf[0] = '\0';
1559 return;
1560 }
1561 // Lazy resolve the path to current module.
1562 if (saved_jvm_path[0] != 0) {
1563 strcpy(buf, saved_jvm_path);
1564 return;
1565 }
1566
1567 Dl_info dlinfo;
1568 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1569 assert(ret != 0, "cannot locate libjvm");
1570 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1571 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1572
1573 if (Arguments::sun_java_launcher_is_altjvm()) {
1574 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1575 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1576 // If "/jre/lib/" appears at the right place in the string, then
1577 // assume we are installed in a JDK and we're done. Otherwise, check
1578 // for a JAVA_HOME environment variable and fix up the path so it
1579 // looks like libjvm.so is installed there (append a fake suffix
1580 // hotspot/libjvm.so).
1581 const char *p = buf + strlen(buf) - 1;
1582 for (int count = 0; p > buf && count < 4; ++count) {
1583 for (--p; p > buf && *p != '/'; --p)
1584 /* empty */ ;
1585 }
1586
1587 if (strncmp(p, "/jre/lib/", 9) != 0) {
1588 // Look for JAVA_HOME in the environment.
1589 char* java_home_var = ::getenv("JAVA_HOME");
1590 if (java_home_var != NULL && java_home_var[0] != 0) {
1591 char* jrelib_p;
1592 int len;
1593
1594 // Check the current module name "libjvm.so".
1595 p = strrchr(buf, '/');
1596 if (p == NULL) {
1597 return;
1598 }
1599 assert(strstr(p, "/libjvm") == p, "invalid library name");
1600
1601 rp = os::Posix::realpath(java_home_var, buf, buflen);
1602 if (rp == NULL) {
1603 return;
1604 }
1605
1606 // determine if this is a legacy image or modules image
1607 // modules image doesn't have "jre" subdirectory
1608 len = strlen(buf);
1609 assert(len < buflen, "Ran out of buffer room");
1610 jrelib_p = buf + len;
1611 snprintf(jrelib_p, buflen-len, "/jre/lib");
1612 if (0 != access(buf, F_OK)) {
1613 snprintf(jrelib_p, buflen-len, "/lib");
1614 }
1615
1616 if (0 == access(buf, F_OK)) {
1617 // Use current module name "libjvm.so"
1618 len = strlen(buf);
1619 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1620 } else {
1621 // Go back to path of .so
1622 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1623 if (rp == NULL) {
1624 return;
1625 }
1626 }
1627 }
1628 }
1629 }
1630
1631 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1632 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1633 }
1634
1635 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1636 // no prefix required, not even "_"
1637 }
1638
1639 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1640 // no suffix required
1641 }
1642
1643 ////////////////////////////////////////////////////////////////////////////////
1644 // sun.misc.Signal support
1645
1646 static volatile jint sigint_count = 0;
1647
1648 static void
1649 UserHandler(int sig, void *siginfo, void *context) {
1650 // 4511530 - sem_post is serialized and handled by the manager thread. When
1651 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1652 // don't want to flood the manager thread with sem_post requests.
1653 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1654 return;
1655
1656 // Ctrl-C is pressed during error reporting, likely because the error
1657 // handler fails to abort. Let VM die immediately.
1658 if (sig == SIGINT && VMError::is_error_reported()) {
1659 os::die();
1660 }
1661
1662 os::signal_notify(sig);
1663 }
1664
1665 void* os::user_handler() {
1666 return CAST_FROM_FN_PTR(void*, UserHandler);
1667 }
1668
1669 extern "C" {
1670 typedef void (*sa_handler_t)(int);
1671 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1672 }
1673
1674 void* os::signal(int signal_number, void* handler) {
1675 struct sigaction sigAct, oldSigAct;
1676
1677 sigfillset(&(sigAct.sa_mask));
1678
1679 // Do not block out synchronous signals in the signal handler.
1680 // Blocking synchronous signals only makes sense if you can really
1681 // be sure that those signals won't happen during signal handling,
1682 // when the blocking applies. Normal signal handlers are lean and
1683 // do not cause signals. But our signal handlers tend to be "risky"
1684 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1685 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1686 // by a SIGILL, which was blocked due to the signal mask. The process
1687 // just hung forever. Better to crash from a secondary signal than to hang.
1688 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1689 sigdelset(&(sigAct.sa_mask), SIGBUS);
1690 sigdelset(&(sigAct.sa_mask), SIGILL);
1691 sigdelset(&(sigAct.sa_mask), SIGFPE);
1692 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1693
1694 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1695
1696 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1697
1698 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1699 // -1 means registration failed
1700 return (void *)-1;
1701 }
1702
1703 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1704 }
1705
1706 void os::signal_raise(int signal_number) {
1707 ::raise(signal_number);
1708 }
1709
1710 //
1711 // The following code is moved from os.cpp for making this
1712 // code platform specific, which it is by its very nature.
1713 //
1714
1715 // Will be modified when max signal is changed to be dynamic
1716 int os::sigexitnum_pd() {
1717 return NSIG;
1718 }
1719
1720 // a counter for each possible signal value
1721 static volatile jint pending_signals[NSIG+1] = { 0 };
1722
1723 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1724 // On AIX, we use sem_init(), sem_post(), sem_wait()
1725 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1726 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1727 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1728 // on AIX, msem_..() calls are suspected of causing problems.
1729 static sem_t sig_sem;
1730 static msemaphore* p_sig_msem = 0;
1731
1732 static void local_sem_init() {
1733 if (os::Aix::on_aix()) {
1734 int rc = ::sem_init(&sig_sem, 0, 0);
1735 guarantee(rc != -1, "sem_init failed");
1736 } else {
1737 // Memory semaphores must live in shared mem.
1738 guarantee0(p_sig_msem == NULL);
1739 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1740 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1741 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1742 }
1743 }
1744
1745 static void local_sem_post() {
1746 static bool warn_only_once = false;
1747 if (os::Aix::on_aix()) {
1748 int rc = ::sem_post(&sig_sem);
1749 if (rc == -1 && !warn_only_once) {
1750 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1751 warn_only_once = true;
1752 }
1753 } else {
1754 guarantee0(p_sig_msem != NULL);
1755 int rc = ::msem_unlock(p_sig_msem, 0);
1756 if (rc == -1 && !warn_only_once) {
1757 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1758 warn_only_once = true;
1759 }
1760 }
1761 }
1762
1763 static void local_sem_wait() {
1764 static bool warn_only_once = false;
1765 if (os::Aix::on_aix()) {
1766 int rc = ::sem_wait(&sig_sem);
1767 if (rc == -1 && !warn_only_once) {
1768 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1769 warn_only_once = true;
1770 }
1771 } else {
1772 guarantee0(p_sig_msem != NULL); // must init before use
1773 int rc = ::msem_lock(p_sig_msem, 0);
1774 if (rc == -1 && !warn_only_once) {
1775 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1776 warn_only_once = true;
1777 }
1778 }
1779 }
1780
1781 static void jdk_misc_signal_init() {
1782 // Initialize signal structures
1783 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1784
1785 // Initialize signal semaphore
1786 local_sem_init();
1787 }
1788
1789 void os::signal_notify(int sig) {
1790 Atomic::inc(&pending_signals[sig]);
1791 local_sem_post();
1792 }
1793
1794 static int check_pending_signals() {
1795 Atomic::store(0, &sigint_count);
1796 for (;;) {
1797 for (int i = 0; i < NSIG + 1; i++) {
1798 jint n = pending_signals[i];
1799 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1800 return i;
1801 }
1802 }
1803 JavaThread *thread = JavaThread::current();
1804 ThreadBlockInVM tbivm(thread);
1805
1806 bool threadIsSuspended;
1807 do {
1808 thread->set_suspend_equivalent();
1809 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1810
1811 local_sem_wait();
1812
1813 // were we externally suspended while we were waiting?
1814 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1815 if (threadIsSuspended) {
1816 //
1817 // The semaphore has been incremented, but while we were waiting
1818 // another thread suspended us. We don't want to continue running
1819 // while suspended because that would surprise the thread that
1820 // suspended us.
1821 //
1822
1823 local_sem_post();
1824
1825 thread->java_suspend_self();
1826 }
1827 } while (threadIsSuspended);
1828 }
1829 }
1830
1831 int os::signal_wait() {
1832 return check_pending_signals();
1833 }
1834
1835 ////////////////////////////////////////////////////////////////////////////////
1836 // Virtual Memory
1837
1838 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1839
1840 #define VMEM_MAPPED 1
1841 #define VMEM_SHMATED 2
1842
1843 struct vmembk_t {
1844 int type; // 1 - mmap, 2 - shmat
1845 char* addr;
1846 size_t size; // Real size, may be larger than usersize.
1847 size_t pagesize; // page size of area
1848 vmembk_t* next;
1849
1850 bool contains_addr(char* p) const {
1851 return p >= addr && p < (addr + size);
1852 }
1853
1854 bool contains_range(char* p, size_t s) const {
1855 return contains_addr(p) && contains_addr(p + s - 1);
1856 }
1857
1858 void print_on(outputStream* os) const {
1859 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1860 " bytes, %d %s pages), %s",
1861 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1862 (type == VMEM_SHMATED ? "shmat" : "mmap")
1863 );
1864 }
1865
1866 // Check that range is a sub range of memory block (or equal to memory block);
1867 // also check that range is fully page aligned to the page size if the block.
1868 void assert_is_valid_subrange(char* p, size_t s) const {
1869 if (!contains_range(p, s)) {
1870 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1871 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1872 p, p + s, addr, addr + size);
1873 guarantee0(false);
1874 }
1875 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1876 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1877 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1878 guarantee0(false);
1879 }
1880 }
1881 };
1882
1883 static struct {
1884 vmembk_t* first;
1885 MiscUtils::CritSect cs;
1886 } vmem;
1887
1888 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1889 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1890 assert0(p);
1891 if (p) {
1892 MiscUtils::AutoCritSect lck(&vmem.cs);
1893 p->addr = addr; p->size = size;
1894 p->pagesize = pagesize;
1895 p->type = type;
1896 p->next = vmem.first;
1897 vmem.first = p;
1898 }
1899 }
1900
1901 static vmembk_t* vmembk_find(char* addr) {
1902 MiscUtils::AutoCritSect lck(&vmem.cs);
1903 for (vmembk_t* p = vmem.first; p; p = p->next) {
1904 if (p->addr <= addr && (p->addr + p->size) > addr) {
1905 return p;
1906 }
1907 }
1908 return NULL;
1909 }
1910
1911 static void vmembk_remove(vmembk_t* p0) {
1912 MiscUtils::AutoCritSect lck(&vmem.cs);
1913 assert0(p0);
1914 assert0(vmem.first); // List should not be empty.
1915 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1916 if (*pp == p0) {
1917 *pp = p0->next;
1918 ::free(p0);
1919 return;
1920 }
1921 }
1922 assert0(false); // Not found?
1923 }
1924
1925 static void vmembk_print_on(outputStream* os) {
1926 MiscUtils::AutoCritSect lck(&vmem.cs);
1927 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1928 vmi->print_on(os);
1929 os->cr();
1930 }
1931 }
1932
1933 // Reserve and attach a section of System V memory.
1934 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1935 // address. Failing that, it will attach the memory anywhere.
1936 // If <requested_addr> is NULL, function will attach the memory anywhere.
1937 //
1938 // <alignment_hint> is being ignored by this function. It is very probable however that the
1939 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1940 // Should this be not enogh, we can put more work into it.
1941 static char* reserve_shmated_memory (
1942 size_t bytes,
1943 char* requested_addr,
1944 size_t alignment_hint) {
1945
1946 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1947 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1948 bytes, requested_addr, alignment_hint);
1949
1950 // Either give me wish address or wish alignment but not both.
1951 assert0(!(requested_addr != NULL && alignment_hint != 0));
1952
1953 // We must prevent anyone from attaching too close to the
1954 // BRK because that may cause malloc OOM.
1955 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1956 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1957 "Will attach anywhere.", requested_addr);
1958 // Act like the OS refused to attach there.
1959 requested_addr = NULL;
1960 }
1961
1962 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1963 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1964 if (os::Aix::on_pase_V5R4_or_older()) {
1965 ShouldNotReachHere();
1966 }
1967
1968 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1969 const size_t size = align_up(bytes, 64*K);
1970
1971 // Reserve the shared segment.
1972 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1973 if (shmid == -1) {
1974 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1975 return NULL;
1976 }
1977
1978 // Important note:
1979 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1980 // We must right after attaching it remove it from the system. System V shm segments are global and
1981 // survive the process.
1982 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1983
1984 struct shmid_ds shmbuf;
1985 memset(&shmbuf, 0, sizeof(shmbuf));
1986 shmbuf.shm_pagesize = 64*K;
1987 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1988 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1989 size / (64*K), errno);
1990 // I want to know if this ever happens.
1991 assert(false, "failed to set page size for shmat");
1992 }
1993
1994 // Now attach the shared segment.
1995 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1996 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1997 // were not a segment boundary.
1998 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1999 const int errno_shmat = errno;
2000
2001 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2002 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2003 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2004 assert(false, "failed to remove shared memory segment!");
2005 }
2006
2007 // Handle shmat error. If we failed to attach, just return.
2008 if (addr == (char*)-1) {
2009 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2010 return NULL;
2011 }
2012
2013 // Just for info: query the real page size. In case setting the page size did not
2014 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2015 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2016 if (real_pagesize != shmbuf.shm_pagesize) {
2017 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2018 }
2019
2020 if (addr) {
2021 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2022 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2023 } else {
2024 if (requested_addr != NULL) {
2025 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2026 } else {
2027 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2028 }
2029 }
2030
2031 // book-keeping
2032 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2033 assert0(is_aligned_to(addr, os::vm_page_size()));
2034
2035 return addr;
2036 }
2037
2038 static bool release_shmated_memory(char* addr, size_t size) {
2039
2040 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2041 addr, addr + size - 1);
2042
2043 bool rc = false;
2044
2045 // TODO: is there a way to verify shm size without doing bookkeeping?
2046 if (::shmdt(addr) != 0) {
2047 trcVerbose("error (%d).", errno);
2048 } else {
2049 trcVerbose("ok.");
2050 rc = true;
2051 }
2052 return rc;
2053 }
2054
2055 static bool uncommit_shmated_memory(char* addr, size_t size) {
2056 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2057 addr, addr + size - 1);
2058
2059 const bool rc = my_disclaim64(addr, size);
2060
2061 if (!rc) {
2062 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2063 return false;
2064 }
2065 return true;
2066 }
2067
2068 //////////////////////////////// mmap-based routines /////////////////////////////////
2069
2070 // Reserve memory via mmap.
2071 // If <requested_addr> is given, an attempt is made to attach at the given address.
2072 // Failing that, memory is allocated at any address.
2073 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2074 // allocate at an address aligned with the given alignment. Failing that, memory
2075 // is aligned anywhere.
2076 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2077 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2078 "alignment_hint " UINTX_FORMAT "...",
2079 bytes, requested_addr, alignment_hint);
2080
2081 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2082 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2083 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2084 return NULL;
2085 }
2086
2087 // We must prevent anyone from attaching too close to the
2088 // BRK because that may cause malloc OOM.
2089 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2090 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2091 "Will attach anywhere.", requested_addr);
2092 // Act like the OS refused to attach there.
2093 requested_addr = NULL;
2094 }
2095
2096 // Specify one or the other but not both.
2097 assert0(!(requested_addr != NULL && alignment_hint > 0));
2098
2099 // In 64K mode, we claim the global page size (os::vm_page_size())
2100 // is 64K. This is one of the few points where that illusion may
2101 // break, because mmap() will always return memory aligned to 4K. So
2102 // we must ensure we only ever return memory aligned to 64k.
2103 if (alignment_hint) {
2104 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2105 } else {
2106 alignment_hint = os::vm_page_size();
2107 }
2108
2109 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2110 const size_t size = align_up(bytes, os::vm_page_size());
2111
2112 // alignment: Allocate memory large enough to include an aligned range of the right size and
2113 // cut off the leading and trailing waste pages.
2114 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2115 const size_t extra_size = size + alignment_hint;
2116
2117 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2118 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2119 int flags = MAP_ANONYMOUS | MAP_SHARED;
2120
2121 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2122 // it means if wishaddress is given but MAP_FIXED is not set.
2123 //
2124 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2125 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2126 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2127 // get clobbered.
2128 if (requested_addr != NULL) {
2129 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2130 flags |= MAP_FIXED;
2131 }
2132 }
2133
2134 char* addr = (char*)::mmap(requested_addr, extra_size,
2135 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2136
2137 if (addr == MAP_FAILED) {
2138 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2139 return NULL;
2140 }
2141
2142 // Handle alignment.
2143 char* const addr_aligned = align_up(addr, alignment_hint);
2144 const size_t waste_pre = addr_aligned - addr;
2145 char* const addr_aligned_end = addr_aligned + size;
2146 const size_t waste_post = extra_size - waste_pre - size;
2147 if (waste_pre > 0) {
2148 ::munmap(addr, waste_pre);
2149 }
2150 if (waste_post > 0) {
2151 ::munmap(addr_aligned_end, waste_post);
2152 }
2153 addr = addr_aligned;
2154
2155 if (addr) {
2156 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2157 addr, addr + bytes, bytes);
2158 } else {
2159 if (requested_addr != NULL) {
2160 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2161 } else {
2162 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2163 }
2164 }
2165
2166 // bookkeeping
2167 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2168
2169 // Test alignment, see above.
2170 assert0(is_aligned_to(addr, os::vm_page_size()));
2171
2172 return addr;
2173 }
2174
2175 static bool release_mmaped_memory(char* addr, size_t size) {
2176 assert0(is_aligned_to(addr, os::vm_page_size()));
2177 assert0(is_aligned_to(size, os::vm_page_size()));
2178
2179 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2180 addr, addr + size - 1);
2181 bool rc = false;
2182
2183 if (::munmap(addr, size) != 0) {
2184 trcVerbose("failed (%d)\n", errno);
2185 rc = false;
2186 } else {
2187 trcVerbose("ok.");
2188 rc = true;
2189 }
2190
2191 return rc;
2192 }
2193
2194 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2195
2196 assert0(is_aligned_to(addr, os::vm_page_size()));
2197 assert0(is_aligned_to(size, os::vm_page_size()));
2198
2199 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2200 addr, addr + size - 1);
2201 bool rc = false;
2202
2203 // Uncommit mmap memory with msync MS_INVALIDATE.
2204 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2205 trcVerbose("failed (%d)\n", errno);
2206 rc = false;
2207 } else {
2208 trcVerbose("ok.");
2209 rc = true;
2210 }
2211
2212 return rc;
2213 }
2214
2215 int os::vm_page_size() {
2216 // Seems redundant as all get out.
2217 assert(os::Aix::page_size() != -1, "must call os::init");
2218 return os::Aix::page_size();
2219 }
2220
2221 // Aix allocates memory by pages.
2222 int os::vm_allocation_granularity() {
2223 assert(os::Aix::page_size() != -1, "must call os::init");
2224 return os::Aix::page_size();
2225 }
2226
2227 #ifdef PRODUCT
2228 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2229 int err) {
2230 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2231 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2232 os::errno_name(err), err);
2233 }
2234 #endif
2235
2236 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2237 const char* mesg) {
2238 assert(mesg != NULL, "mesg must be specified");
2239 if (!pd_commit_memory(addr, size, exec)) {
2240 // Add extra info in product mode for vm_exit_out_of_memory():
2241 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2242 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2243 }
2244 }
2245
2246 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2247
2248 assert(is_aligned_to(addr, os::vm_page_size()),
2249 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2250 p2i(addr), os::vm_page_size());
2251 assert(is_aligned_to(size, os::vm_page_size()),
2252 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2253 size, os::vm_page_size());
2254
2255 vmembk_t* const vmi = vmembk_find(addr);
2256 guarantee0(vmi);
2257 vmi->assert_is_valid_subrange(addr, size);
2258
2259 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2260
2261 if (UseExplicitCommit) {
2262 // AIX commits memory on touch. So, touch all pages to be committed.
2263 for (char* p = addr; p < (addr + size); p += 4*K) {
2264 *p = '\0';
2265 }
2266 }
2267
2268 return true;
2269 }
2270
2271 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2272 return pd_commit_memory(addr, size, exec);
2273 }
2274
2275 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2276 size_t alignment_hint, bool exec,
2277 const char* mesg) {
2278 // Alignment_hint is ignored on this OS.
2279 pd_commit_memory_or_exit(addr, size, exec, mesg);
2280 }
2281
2282 bool os::pd_uncommit_memory(char* addr, size_t size) {
2283 assert(is_aligned_to(addr, os::vm_page_size()),
2284 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2285 p2i(addr), os::vm_page_size());
2286 assert(is_aligned_to(size, os::vm_page_size()),
2287 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2288 size, os::vm_page_size());
2289
2290 // Dynamically do different things for mmap/shmat.
2291 const vmembk_t* const vmi = vmembk_find(addr);
2292 guarantee0(vmi);
2293 vmi->assert_is_valid_subrange(addr, size);
2294
2295 if (vmi->type == VMEM_SHMATED) {
2296 return uncommit_shmated_memory(addr, size);
2297 } else {
2298 return uncommit_mmaped_memory(addr, size);
2299 }
2300 }
2301
2302 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2303 // Do not call this; no need to commit stack pages on AIX.
2304 ShouldNotReachHere();
2305 return true;
2306 }
2307
2308 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2309 // Do not call this; no need to commit stack pages on AIX.
2310 ShouldNotReachHere();
2311 return true;
2312 }
2313
2314 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2315 }
2316
2317 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2318 }
2319
2320 void os::numa_make_global(char *addr, size_t bytes) {
2321 }
2322
2323 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2324 }
2325
2326 bool os::numa_topology_changed() {
2327 return false;
2328 }
2329
2330 size_t os::numa_get_groups_num() {
2331 return 1;
2332 }
2333
2334 int os::numa_get_group_id() {
2335 return 0;
2336 }
2337
2338 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2339 if (size > 0) {
2340 ids[0] = 0;
2341 return 1;
2342 }
2343 return 0;
2344 }
2345
2346 bool os::get_page_info(char *start, page_info* info) {
2347 return false;
2348 }
2349
2350 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2351 return end;
2352 }
2353
2354 // Reserves and attaches a shared memory segment.
2355 // Will assert if a wish address is given and could not be obtained.
2356 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2357
2358 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2359 // thereby clobbering old mappings at that place. That is probably
2360 // not intended, never used and almost certainly an error were it
2361 // ever be used this way (to try attaching at a specified address
2362 // without clobbering old mappings an alternate API exists,
2363 // os::attempt_reserve_memory_at()).
2364 // Instead of mimicking the dangerous coding of the other platforms, here I
2365 // just ignore the request address (release) or assert(debug).
2366 assert0(requested_addr == NULL);
2367
2368 // Always round to os::vm_page_size(), which may be larger than 4K.
2369 bytes = align_up(bytes, os::vm_page_size());
2370 const size_t alignment_hint0 =
2371 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2372
2373 // In 4K mode always use mmap.
2374 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2375 if (os::vm_page_size() == 4*K) {
2376 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2377 } else {
2378 if (bytes >= Use64KPagesThreshold) {
2379 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2380 } else {
2381 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2382 }
2383 }
2384 }
2385
2386 bool os::pd_release_memory(char* addr, size_t size) {
2387
2388 // Dynamically do different things for mmap/shmat.
2389 vmembk_t* const vmi = vmembk_find(addr);
2390 guarantee0(vmi);
2391
2392 // Always round to os::vm_page_size(), which may be larger than 4K.
2393 size = align_up(size, os::vm_page_size());
2394 addr = align_up(addr, os::vm_page_size());
2395
2396 bool rc = false;
2397 bool remove_bookkeeping = false;
2398 if (vmi->type == VMEM_SHMATED) {
2399 // For shmatted memory, we do:
2400 // - If user wants to release the whole range, release the memory (shmdt).
2401 // - If user only wants to release a partial range, uncommit (disclaim) that
2402 // range. That way, at least, we do not use memory anymore (bust still page
2403 // table space).
2404 vmi->assert_is_valid_subrange(addr, size);
2405 if (addr == vmi->addr && size == vmi->size) {
2406 rc = release_shmated_memory(addr, size);
2407 remove_bookkeeping = true;
2408 } else {
2409 rc = uncommit_shmated_memory(addr, size);
2410 }
2411 } else {
2412 // User may unmap partial regions but region has to be fully contained.
2413 #ifdef ASSERT
2414 vmi->assert_is_valid_subrange(addr, size);
2415 #endif
2416 rc = release_mmaped_memory(addr, size);
2417 remove_bookkeeping = true;
2418 }
2419
2420 // update bookkeeping
2421 if (rc && remove_bookkeeping) {
2422 vmembk_remove(vmi);
2423 }
2424
2425 return rc;
2426 }
2427
2428 static bool checked_mprotect(char* addr, size_t size, int prot) {
2429
2430 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2431 // not tell me if protection failed when trying to protect an un-protectable range.
2432 //
2433 // This means if the memory was allocated using shmget/shmat, protection wont work
2434 // but mprotect will still return 0:
2435 //
2436 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2437
2438 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2439
2440 if (!rc) {
2441 const char* const s_errno = os::errno_name(errno);
2442 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2443 return false;
2444 }
2445
2446 // mprotect success check
2447 //
2448 // Mprotect said it changed the protection but can I believe it?
2449 //
2450 // To be sure I need to check the protection afterwards. Try to
2451 // read from protected memory and check whether that causes a segfault.
2452 //
2453 if (!os::Aix::xpg_sus_mode()) {
2454
2455 if (CanUseSafeFetch32()) {
2456
2457 const bool read_protected =
2458 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2459 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2460
2461 if (prot & PROT_READ) {
2462 rc = !read_protected;
2463 } else {
2464 rc = read_protected;
2465 }
2466
2467 if (!rc) {
2468 if (os::Aix::on_pase()) {
2469 // There is an issue on older PASE systems where mprotect() will return success but the
2470 // memory will not be protected.
2471 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2472 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2473 // a stack. It is an OS error.
2474 //
2475 // A valid strategy is just to try again. This usually works. :-/
2476
2477 ::usleep(1000);
2478 if (::mprotect(addr, size, prot) == 0) {
2479 const bool read_protected_2 =
2480 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2481 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2482 rc = true;
2483 }
2484 }
2485 }
2486 }
2487 }
2488
2489 assert(rc == true, "mprotect failed.");
2490
2491 return rc;
2492 }
2493
2494 // Set protections specified
2495 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2496 unsigned int p = 0;
2497 switch (prot) {
2498 case MEM_PROT_NONE: p = PROT_NONE; break;
2499 case MEM_PROT_READ: p = PROT_READ; break;
2500 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2501 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2502 default:
2503 ShouldNotReachHere();
2504 }
2505 // is_committed is unused.
2506 return checked_mprotect(addr, size, p);
2507 }
2508
2509 bool os::guard_memory(char* addr, size_t size) {
2510 return checked_mprotect(addr, size, PROT_NONE);
2511 }
2512
2513 bool os::unguard_memory(char* addr, size_t size) {
2514 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2515 }
2516
2517 // Large page support
2518
2519 static size_t _large_page_size = 0;
2520
2521 // Enable large page support if OS allows that.
2522 void os::large_page_init() {
2523 return; // Nothing to do. See query_multipage_support and friends.
2524 }
2525
2526 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2527 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2528 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2529 // so this is not needed.
2530 assert(false, "should not be called on AIX");
2531 return NULL;
2532 }
2533
2534 bool os::release_memory_special(char* base, size_t bytes) {
2535 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2536 Unimplemented();
2537 return false;
2538 }
2539
2540 size_t os::large_page_size() {
2541 return _large_page_size;
2542 }
2543
2544 bool os::can_commit_large_page_memory() {
2545 // Does not matter, we do not support huge pages.
2546 return false;
2547 }
2548
2549 bool os::can_execute_large_page_memory() {
2550 // Does not matter, we do not support huge pages.
2551 return false;
2552 }
2553
2554 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2555 assert(file_desc >= 0, "file_desc is not valid");
2556 char* result = NULL;
2557
2558 // Always round to os::vm_page_size(), which may be larger than 4K.
2559 bytes = align_up(bytes, os::vm_page_size());
2560 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2561
2562 if (result != NULL) {
2563 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2564 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2565 }
2566 }
2567 return result;
2568 }
2569
2570 // Reserve memory at an arbitrary address, only if that area is
2571 // available (and not reserved for something else).
2572 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2573 char* addr = NULL;
2574
2575 // Always round to os::vm_page_size(), which may be larger than 4K.
2576 bytes = align_up(bytes, os::vm_page_size());
2577
2578 // In 4K mode always use mmap.
2579 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2580 if (os::vm_page_size() == 4*K) {
2581 return reserve_mmaped_memory(bytes, requested_addr, 0);
2582 } else {
2583 if (bytes >= Use64KPagesThreshold) {
2584 return reserve_shmated_memory(bytes, requested_addr, 0);
2585 } else {
2586 return reserve_mmaped_memory(bytes, requested_addr, 0);
2587 }
2588 }
2589
2590 return addr;
2591 }
2592
2593 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2594 return ::read(fd, buf, nBytes);
2595 }
2596
2597 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2598 return ::pread(fd, buf, nBytes, offset);
2599 }
2600
2601 void os::naked_short_sleep(jlong ms) {
2602 struct timespec req;
2603
2604 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2605 req.tv_sec = 0;
2606 if (ms > 0) {
2607 req.tv_nsec = (ms % 1000) * 1000000;
2608 }
2609 else {
2610 req.tv_nsec = 1;
2611 }
2612
2613 nanosleep(&req, NULL);
2614
2615 return;
2616 }
2617
2618 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2619 void os::infinite_sleep() {
2620 while (true) { // sleep forever ...
2621 ::sleep(100); // ... 100 seconds at a time
2622 }
2623 }
2624
2625 // Used to convert frequent JVM_Yield() to nops
2626 bool os::dont_yield() {
2627 return DontYieldALot;
2628 }
2629
2630 void os::naked_yield() {
2631 sched_yield();
2632 }
2633
2634 ////////////////////////////////////////////////////////////////////////////////
2635 // thread priority support
2636
2637 // From AIX manpage to pthread_setschedparam
2638 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2639 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2640 //
2641 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2642 // range from 40 to 80, where 40 is the least favored priority and 80
2643 // is the most favored."
2644 //
2645 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2646 // scheduling there; however, this still leaves iSeries.)
2647 //
2648 // We use the same values for AIX and PASE.
2649 int os::java_to_os_priority[CriticalPriority + 1] = {
2650 54, // 0 Entry should never be used
2651
2652 55, // 1 MinPriority
2653 55, // 2
2654 56, // 3
2655
2656 56, // 4
2657 57, // 5 NormPriority
2658 57, // 6
2659
2660 58, // 7
2661 58, // 8
2662 59, // 9 NearMaxPriority
2663
2664 60, // 10 MaxPriority
2665
2666 60 // 11 CriticalPriority
2667 };
2668
2669 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2670 if (!UseThreadPriorities) return OS_OK;
2671 pthread_t thr = thread->osthread()->pthread_id();
2672 int policy = SCHED_OTHER;
2673 struct sched_param param;
2674 param.sched_priority = newpri;
2675 int ret = pthread_setschedparam(thr, policy, ¶m);
2676
2677 if (ret != 0) {
2678 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2679 (int)thr, newpri, ret, os::errno_name(ret));
2680 }
2681 return (ret == 0) ? OS_OK : OS_ERR;
2682 }
2683
2684 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2685 if (!UseThreadPriorities) {
2686 *priority_ptr = java_to_os_priority[NormPriority];
2687 return OS_OK;
2688 }
2689 pthread_t thr = thread->osthread()->pthread_id();
2690 int policy = SCHED_OTHER;
2691 struct sched_param param;
2692 int ret = pthread_getschedparam(thr, &policy, ¶m);
2693 *priority_ptr = param.sched_priority;
2694
2695 return (ret == 0) ? OS_OK : OS_ERR;
2696 }
2697
2698 ////////////////////////////////////////////////////////////////////////////////
2699 // suspend/resume support
2700
2701 // The low-level signal-based suspend/resume support is a remnant from the
2702 // old VM-suspension that used to be for java-suspension, safepoints etc,
2703 // within hotspot. Currently used by JFR's OSThreadSampler
2704 //
2705 // The remaining code is greatly simplified from the more general suspension
2706 // code that used to be used.
2707 //
2708 // The protocol is quite simple:
2709 // - suspend:
2710 // - sends a signal to the target thread
2711 // - polls the suspend state of the osthread using a yield loop
2712 // - target thread signal handler (SR_handler) sets suspend state
2713 // and blocks in sigsuspend until continued
2714 // - resume:
2715 // - sets target osthread state to continue
2716 // - sends signal to end the sigsuspend loop in the SR_handler
2717 //
2718 // Note that the SR_lock plays no role in this suspend/resume protocol,
2719 // but is checked for NULL in SR_handler as a thread termination indicator.
2720 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2721 //
2722 // Note that resume_clear_context() and suspend_save_context() are needed
2723 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2724 // which in part is used by:
2725 // - Forte Analyzer: AsyncGetCallTrace()
2726 // - StackBanging: get_frame_at_stack_banging_point()
2727
2728 static void resume_clear_context(OSThread *osthread) {
2729 osthread->set_ucontext(NULL);
2730 osthread->set_siginfo(NULL);
2731 }
2732
2733 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2734 osthread->set_ucontext(context);
2735 osthread->set_siginfo(siginfo);
2736 }
2737
2738 //
2739 // Handler function invoked when a thread's execution is suspended or
2740 // resumed. We have to be careful that only async-safe functions are
2741 // called here (Note: most pthread functions are not async safe and
2742 // should be avoided.)
2743 //
2744 // Note: sigwait() is a more natural fit than sigsuspend() from an
2745 // interface point of view, but sigwait() prevents the signal hander
2746 // from being run. libpthread would get very confused by not having
2747 // its signal handlers run and prevents sigwait()'s use with the
2748 // mutex granting granting signal.
2749 //
2750 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2751 //
2752 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2753 // Save and restore errno to avoid confusing native code with EINTR
2754 // after sigsuspend.
2755 int old_errno = errno;
2756
2757 Thread* thread = Thread::current_or_null_safe();
2758 assert(thread != NULL, "Missing current thread in SR_handler");
2759
2760 // On some systems we have seen signal delivery get "stuck" until the signal
2761 // mask is changed as part of thread termination. Check that the current thread
2762 // has not already terminated (via SR_lock()) - else the following assertion
2763 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2764 // destructor has completed.
2765
2766 if (thread->SR_lock() == NULL) {
2767 return;
2768 }
2769
2770 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2771
2772 OSThread* osthread = thread->osthread();
2773
2774 os::SuspendResume::State current = osthread->sr.state();
2775 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2776 suspend_save_context(osthread, siginfo, context);
2777
2778 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2779 os::SuspendResume::State state = osthread->sr.suspended();
2780 if (state == os::SuspendResume::SR_SUSPENDED) {
2781 sigset_t suspend_set; // signals for sigsuspend()
2782
2783 // get current set of blocked signals and unblock resume signal
2784 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2785 sigdelset(&suspend_set, SR_signum);
2786
2787 // wait here until we are resumed
2788 while (1) {
2789 sigsuspend(&suspend_set);
2790
2791 os::SuspendResume::State result = osthread->sr.running();
2792 if (result == os::SuspendResume::SR_RUNNING) {
2793 break;
2794 }
2795 }
2796
2797 } else if (state == os::SuspendResume::SR_RUNNING) {
2798 // request was cancelled, continue
2799 } else {
2800 ShouldNotReachHere();
2801 }
2802
2803 resume_clear_context(osthread);
2804 } else if (current == os::SuspendResume::SR_RUNNING) {
2805 // request was cancelled, continue
2806 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2807 // ignore
2808 } else {
2809 ShouldNotReachHere();
2810 }
2811
2812 errno = old_errno;
2813 }
2814
2815 static int SR_initialize() {
2816 struct sigaction act;
2817 char *s;
2818 // Get signal number to use for suspend/resume
2819 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2820 int sig = ::strtol(s, 0, 10);
2821 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2822 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2823 SR_signum = sig;
2824 } else {
2825 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2826 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2827 }
2828 }
2829
2830 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2831 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2832
2833 sigemptyset(&SR_sigset);
2834 sigaddset(&SR_sigset, SR_signum);
2835
2836 // Set up signal handler for suspend/resume.
2837 act.sa_flags = SA_RESTART|SA_SIGINFO;
2838 act.sa_handler = (void (*)(int)) SR_handler;
2839
2840 // SR_signum is blocked by default.
2841 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2842
2843 if (sigaction(SR_signum, &act, 0) == -1) {
2844 return -1;
2845 }
2846
2847 // Save signal flag
2848 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2849 return 0;
2850 }
2851
2852 static int SR_finalize() {
2853 return 0;
2854 }
2855
2856 static int sr_notify(OSThread* osthread) {
2857 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2858 assert_status(status == 0, status, "pthread_kill");
2859 return status;
2860 }
2861
2862 // "Randomly" selected value for how long we want to spin
2863 // before bailing out on suspending a thread, also how often
2864 // we send a signal to a thread we want to resume
2865 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2866 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2867
2868 // returns true on success and false on error - really an error is fatal
2869 // but this seems the normal response to library errors
2870 static bool do_suspend(OSThread* osthread) {
2871 assert(osthread->sr.is_running(), "thread should be running");
2872 // mark as suspended and send signal
2873
2874 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2875 // failed to switch, state wasn't running?
2876 ShouldNotReachHere();
2877 return false;
2878 }
2879
2880 if (sr_notify(osthread) != 0) {
2881 // try to cancel, switch to running
2882
2883 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2884 if (result == os::SuspendResume::SR_RUNNING) {
2885 // cancelled
2886 return false;
2887 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2888 // somehow managed to suspend
2889 return true;
2890 } else {
2891 ShouldNotReachHere();
2892 return false;
2893 }
2894 }
2895
2896 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2897
2898 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2899 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2900 os::naked_yield();
2901 }
2902
2903 // timeout, try to cancel the request
2904 if (n >= RANDOMLY_LARGE_INTEGER) {
2905 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2906 if (cancelled == os::SuspendResume::SR_RUNNING) {
2907 return false;
2908 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2909 return true;
2910 } else {
2911 ShouldNotReachHere();
2912 return false;
2913 }
2914 }
2915 }
2916
2917 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2918 return true;
2919 }
2920
2921 static void do_resume(OSThread* osthread) {
2922 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2923
2924 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2925 // failed to switch to WAKEUP_REQUEST
2926 ShouldNotReachHere();
2927 return;
2928 }
2929
2930 while (!osthread->sr.is_running()) {
2931 if (sr_notify(osthread) == 0) {
2932 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2933 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2934 os::naked_yield();
2935 }
2936 }
2937 } else {
2938 ShouldNotReachHere();
2939 }
2940 }
2941
2942 guarantee(osthread->sr.is_running(), "Must be running!");
2943 }
2944
2945 ///////////////////////////////////////////////////////////////////////////////////
2946 // signal handling (except suspend/resume)
2947
2948 // This routine may be used by user applications as a "hook" to catch signals.
2949 // The user-defined signal handler must pass unrecognized signals to this
2950 // routine, and if it returns true (non-zero), then the signal handler must
2951 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2952 // routine will never retun false (zero), but instead will execute a VM panic
2953 // routine kill the process.
2954 //
2955 // If this routine returns false, it is OK to call it again. This allows
2956 // the user-defined signal handler to perform checks either before or after
2957 // the VM performs its own checks. Naturally, the user code would be making
2958 // a serious error if it tried to handle an exception (such as a null check
2959 // or breakpoint) that the VM was generating for its own correct operation.
2960 //
2961 // This routine may recognize any of the following kinds of signals:
2962 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2963 // It should be consulted by handlers for any of those signals.
2964 //
2965 // The caller of this routine must pass in the three arguments supplied
2966 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2967 // field of the structure passed to sigaction(). This routine assumes that
2968 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2969 //
2970 // Note that the VM will print warnings if it detects conflicting signal
2971 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2972 //
2973 extern "C" JNIEXPORT int
2974 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2975
2976 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2977 // to be the thing to call; documentation is not terribly clear about whether
2978 // pthread_sigmask also works, and if it does, whether it does the same.
2979 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2980 const int rc = ::pthread_sigmask(how, set, oset);
2981 // return value semantics differ slightly for error case:
2982 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2983 // (so, pthread_sigmask is more theadsafe for error handling)
2984 // But success is always 0.
2985 return rc == 0 ? true : false;
2986 }
2987
2988 // Function to unblock all signals which are, according
2989 // to POSIX, typical program error signals. If they happen while being blocked,
2990 // they typically will bring down the process immediately.
2991 bool unblock_program_error_signals() {
2992 sigset_t set;
2993 ::sigemptyset(&set);
2994 ::sigaddset(&set, SIGILL);
2995 ::sigaddset(&set, SIGBUS);
2996 ::sigaddset(&set, SIGFPE);
2997 ::sigaddset(&set, SIGSEGV);
2998 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2999 }
3000
3001 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3002 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3003 assert(info != NULL && uc != NULL, "it must be old kernel");
3004
3005 // Never leave program error signals blocked;
3006 // on all our platforms they would bring down the process immediately when
3007 // getting raised while being blocked.
3008 unblock_program_error_signals();
3009
3010 int orig_errno = errno; // Preserve errno value over signal handler.
3011 JVM_handle_aix_signal(sig, info, uc, true);
3012 errno = orig_errno;
3013 }
3014
3015 // This boolean allows users to forward their own non-matching signals
3016 // to JVM_handle_aix_signal, harmlessly.
3017 bool os::Aix::signal_handlers_are_installed = false;
3018
3019 // For signal-chaining
3020 struct sigaction sigact[NSIG];
3021 sigset_t sigs;
3022 bool os::Aix::libjsig_is_loaded = false;
3023 typedef struct sigaction *(*get_signal_t)(int);
3024 get_signal_t os::Aix::get_signal_action = NULL;
3025
3026 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3027 struct sigaction *actp = NULL;
3028
3029 if (libjsig_is_loaded) {
3030 // Retrieve the old signal handler from libjsig
3031 actp = (*get_signal_action)(sig);
3032 }
3033 if (actp == NULL) {
3034 // Retrieve the preinstalled signal handler from jvm
3035 actp = get_preinstalled_handler(sig);
3036 }
3037
3038 return actp;
3039 }
3040
3041 static bool call_chained_handler(struct sigaction *actp, int sig,
3042 siginfo_t *siginfo, void *context) {
3043 // Call the old signal handler
3044 if (actp->sa_handler == SIG_DFL) {
3045 // It's more reasonable to let jvm treat it as an unexpected exception
3046 // instead of taking the default action.
3047 return false;
3048 } else if (actp->sa_handler != SIG_IGN) {
3049 if ((actp->sa_flags & SA_NODEFER) == 0) {
3050 // automaticlly block the signal
3051 sigaddset(&(actp->sa_mask), sig);
3052 }
3053
3054 sa_handler_t hand = NULL;
3055 sa_sigaction_t sa = NULL;
3056 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3057 // retrieve the chained handler
3058 if (siginfo_flag_set) {
3059 sa = actp->sa_sigaction;
3060 } else {
3061 hand = actp->sa_handler;
3062 }
3063
3064 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3065 actp->sa_handler = SIG_DFL;
3066 }
3067
3068 // try to honor the signal mask
3069 sigset_t oset;
3070 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3071
3072 // call into the chained handler
3073 if (siginfo_flag_set) {
3074 (*sa)(sig, siginfo, context);
3075 } else {
3076 (*hand)(sig);
3077 }
3078
3079 // restore the signal mask
3080 pthread_sigmask(SIG_SETMASK, &oset, 0);
3081 }
3082 // Tell jvm's signal handler the signal is taken care of.
3083 return true;
3084 }
3085
3086 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3087 bool chained = false;
3088 // signal-chaining
3089 if (UseSignalChaining) {
3090 struct sigaction *actp = get_chained_signal_action(sig);
3091 if (actp != NULL) {
3092 chained = call_chained_handler(actp, sig, siginfo, context);
3093 }
3094 }
3095 return chained;
3096 }
3097
3098 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3099 if (sigismember(&sigs, sig)) {
3100 return &sigact[sig];
3101 }
3102 return NULL;
3103 }
3104
3105 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3106 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3107 sigact[sig] = oldAct;
3108 sigaddset(&sigs, sig);
3109 }
3110
3111 // for diagnostic
3112 int sigflags[NSIG];
3113
3114 int os::Aix::get_our_sigflags(int sig) {
3115 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3116 return sigflags[sig];
3117 }
3118
3119 void os::Aix::set_our_sigflags(int sig, int flags) {
3120 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3121 if (sig > 0 && sig < NSIG) {
3122 sigflags[sig] = flags;
3123 }
3124 }
3125
3126 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3127 // Check for overwrite.
3128 struct sigaction oldAct;
3129 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3130
3131 void* oldhand = oldAct.sa_sigaction
3132 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3133 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3134 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3135 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3136 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3137 if (AllowUserSignalHandlers || !set_installed) {
3138 // Do not overwrite; user takes responsibility to forward to us.
3139 return;
3140 } else if (UseSignalChaining) {
3141 // save the old handler in jvm
3142 save_preinstalled_handler(sig, oldAct);
3143 // libjsig also interposes the sigaction() call below and saves the
3144 // old sigaction on it own.
3145 } else {
3146 fatal("Encountered unexpected pre-existing sigaction handler "
3147 "%#lx for signal %d.", (long)oldhand, sig);
3148 }
3149 }
3150
3151 struct sigaction sigAct;
3152 sigfillset(&(sigAct.sa_mask));
3153 if (!set_installed) {
3154 sigAct.sa_handler = SIG_DFL;
3155 sigAct.sa_flags = SA_RESTART;
3156 } else {
3157 sigAct.sa_sigaction = javaSignalHandler;
3158 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3159 }
3160 // Save flags, which are set by ours
3161 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3162 sigflags[sig] = sigAct.sa_flags;
3163
3164 int ret = sigaction(sig, &sigAct, &oldAct);
3165 assert(ret == 0, "check");
3166
3167 void* oldhand2 = oldAct.sa_sigaction
3168 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3169 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3170 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3171 }
3172
3173 // install signal handlers for signals that HotSpot needs to
3174 // handle in order to support Java-level exception handling.
3175 void os::Aix::install_signal_handlers() {
3176 if (!signal_handlers_are_installed) {
3177 signal_handlers_are_installed = true;
3178
3179 // signal-chaining
3180 typedef void (*signal_setting_t)();
3181 signal_setting_t begin_signal_setting = NULL;
3182 signal_setting_t end_signal_setting = NULL;
3183 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3184 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3185 if (begin_signal_setting != NULL) {
3186 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3187 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3188 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3189 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3190 libjsig_is_loaded = true;
3191 assert(UseSignalChaining, "should enable signal-chaining");
3192 }
3193 if (libjsig_is_loaded) {
3194 // Tell libjsig jvm is setting signal handlers.
3195 (*begin_signal_setting)();
3196 }
3197
3198 ::sigemptyset(&sigs);
3199 set_signal_handler(SIGSEGV, true);
3200 set_signal_handler(SIGPIPE, true);
3201 set_signal_handler(SIGBUS, true);
3202 set_signal_handler(SIGILL, true);
3203 set_signal_handler(SIGFPE, true);
3204 set_signal_handler(SIGTRAP, true);
3205 set_signal_handler(SIGXFSZ, true);
3206
3207 if (libjsig_is_loaded) {
3208 // Tell libjsig jvm finishes setting signal handlers.
3209 (*end_signal_setting)();
3210 }
3211
3212 // We don't activate signal checker if libjsig is in place, we trust ourselves
3213 // and if UserSignalHandler is installed all bets are off.
3214 // Log that signal checking is off only if -verbose:jni is specified.
3215 if (CheckJNICalls) {
3216 if (libjsig_is_loaded) {
3217 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3218 check_signals = false;
3219 }
3220 if (AllowUserSignalHandlers) {
3221 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3222 check_signals = false;
3223 }
3224 // Need to initialize check_signal_done.
3225 ::sigemptyset(&check_signal_done);
3226 }
3227 }
3228 }
3229
3230 static const char* get_signal_handler_name(address handler,
3231 char* buf, int buflen) {
3232 int offset;
3233 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3234 if (found) {
3235 // skip directory names
3236 const char *p1, *p2;
3237 p1 = buf;
3238 size_t len = strlen(os::file_separator());
3239 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3240 // The way os::dll_address_to_library_name is implemented on Aix
3241 // right now, it always returns -1 for the offset which is not
3242 // terribly informative.
3243 // Will fix that. For now, omit the offset.
3244 jio_snprintf(buf, buflen, "%s", p1);
3245 } else {
3246 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3247 }
3248 return buf;
3249 }
3250
3251 static void print_signal_handler(outputStream* st, int sig,
3252 char* buf, size_t buflen) {
3253 struct sigaction sa;
3254 sigaction(sig, NULL, &sa);
3255
3256 st->print("%s: ", os::exception_name(sig, buf, buflen));
3257
3258 address handler = (sa.sa_flags & SA_SIGINFO)
3259 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3260 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3261
3262 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3263 st->print("SIG_DFL");
3264 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3265 st->print("SIG_IGN");
3266 } else {
3267 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3268 }
3269
3270 // Print readable mask.
3271 st->print(", sa_mask[0]=");
3272 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3273
3274 address rh = VMError::get_resetted_sighandler(sig);
3275 // May be, handler was resetted by VMError?
3276 if (rh != NULL) {
3277 handler = rh;
3278 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3279 }
3280
3281 // Print textual representation of sa_flags.
3282 st->print(", sa_flags=");
3283 os::Posix::print_sa_flags(st, sa.sa_flags);
3284
3285 // Check: is it our handler?
3286 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3287 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3288 // It is our signal handler.
3289 // Check for flags, reset system-used one!
3290 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3291 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3292 os::Aix::get_our_sigflags(sig));
3293 }
3294 }
3295 st->cr();
3296 }
3297
3298 #define DO_SIGNAL_CHECK(sig) \
3299 if (!sigismember(&check_signal_done, sig)) \
3300 os::Aix::check_signal_handler(sig)
3301
3302 // This method is a periodic task to check for misbehaving JNI applications
3303 // under CheckJNI, we can add any periodic checks here
3304
3305 void os::run_periodic_checks() {
3306
3307 if (check_signals == false) return;
3308
3309 // SEGV and BUS if overridden could potentially prevent
3310 // generation of hs*.log in the event of a crash, debugging
3311 // such a case can be very challenging, so we absolutely
3312 // check the following for a good measure:
3313 DO_SIGNAL_CHECK(SIGSEGV);
3314 DO_SIGNAL_CHECK(SIGILL);
3315 DO_SIGNAL_CHECK(SIGFPE);
3316 DO_SIGNAL_CHECK(SIGBUS);
3317 DO_SIGNAL_CHECK(SIGPIPE);
3318 DO_SIGNAL_CHECK(SIGXFSZ);
3319 if (UseSIGTRAP) {
3320 DO_SIGNAL_CHECK(SIGTRAP);
3321 }
3322
3323 // ReduceSignalUsage allows the user to override these handlers
3324 // see comments at the very top and jvm_md.h
3325 if (!ReduceSignalUsage) {
3326 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3327 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3328 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3329 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3330 }
3331
3332 DO_SIGNAL_CHECK(SR_signum);
3333 }
3334
3335 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3336
3337 static os_sigaction_t os_sigaction = NULL;
3338
3339 void os::Aix::check_signal_handler(int sig) {
3340 char buf[O_BUFLEN];
3341 address jvmHandler = NULL;
3342
3343 struct sigaction act;
3344 if (os_sigaction == NULL) {
3345 // only trust the default sigaction, in case it has been interposed
3346 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3347 if (os_sigaction == NULL) return;
3348 }
3349
3350 os_sigaction(sig, (struct sigaction*)NULL, &act);
3351
3352 address thisHandler = (act.sa_flags & SA_SIGINFO)
3353 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3354 : CAST_FROM_FN_PTR(address, act.sa_handler);
3355
3356 switch(sig) {
3357 case SIGSEGV:
3358 case SIGBUS:
3359 case SIGFPE:
3360 case SIGPIPE:
3361 case SIGILL:
3362 case SIGXFSZ:
3363 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3364 break;
3365
3366 case SHUTDOWN1_SIGNAL:
3367 case SHUTDOWN2_SIGNAL:
3368 case SHUTDOWN3_SIGNAL:
3369 case BREAK_SIGNAL:
3370 jvmHandler = (address)user_handler();
3371 break;
3372
3373 default:
3374 if (sig == SR_signum) {
3375 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3376 } else {
3377 return;
3378 }
3379 break;
3380 }
3381
3382 if (thisHandler != jvmHandler) {
3383 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3384 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3385 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3386 // No need to check this sig any longer
3387 sigaddset(&check_signal_done, sig);
3388 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3389 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3390 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3391 exception_name(sig, buf, O_BUFLEN));
3392 }
3393 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3394 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3395 tty->print("expected:");
3396 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3397 tty->cr();
3398 tty->print(" found:");
3399 os::Posix::print_sa_flags(tty, act.sa_flags);
3400 tty->cr();
3401 // No need to check this sig any longer
3402 sigaddset(&check_signal_done, sig);
3403 }
3404
3405 // Dump all the signal
3406 if (sigismember(&check_signal_done, sig)) {
3407 print_signal_handlers(tty, buf, O_BUFLEN);
3408 }
3409 }
3410
3411 // To install functions for atexit system call
3412 extern "C" {
3413 static void perfMemory_exit_helper() {
3414 perfMemory_exit();
3415 }
3416 }
3417
3418 // This is called _before_ the most of global arguments have been parsed.
3419 void os::init(void) {
3420 // This is basic, we want to know if that ever changes.
3421 // (Shared memory boundary is supposed to be a 256M aligned.)
3422 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3423
3424 // Record process break at startup.
3425 g_brk_at_startup = (address) ::sbrk(0);
3426 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3427
3428 // First off, we need to know whether we run on AIX or PASE, and
3429 // the OS level we run on.
3430 os::Aix::initialize_os_info();
3431
3432 // Scan environment (SPEC1170 behaviour, etc).
3433 os::Aix::scan_environment();
3434
3435 // Probe multipage support.
3436 query_multipage_support();
3437
3438 // Act like we only have one page size by eliminating corner cases which
3439 // we did not support very well anyway.
3440 // We have two input conditions:
3441 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3442 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3443 // setting.
3444 // Data segment page size is important for us because it defines the thread stack page
3445 // size, which is needed for guard page handling, stack banging etc.
3446 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3447 // and should be allocated with 64k pages.
3448 //
3449 // So, we do the following:
3450 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3451 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3452 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3453 // 64k no --- AIX 5.2 ? ---
3454 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3455
3456 // We explicitly leave no option to change page size, because only upgrading would work,
3457 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3458
3459 if (g_multipage_support.datapsize == 4*K) {
3460 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3461 if (g_multipage_support.can_use_64K_pages) {
3462 // .. but we are able to use 64K pages dynamically.
3463 // This would be typical for java launchers which are not linked
3464 // with datapsize=64K (like, any other launcher but our own).
3465 //
3466 // In this case it would be smart to allocate the java heap with 64K
3467 // to get the performance benefit, and to fake 64k pages for the
3468 // data segment (when dealing with thread stacks).
3469 //
3470 // However, leave a possibility to downgrade to 4K, using
3471 // -XX:-Use64KPages.
3472 if (Use64KPages) {
3473 trcVerbose("64K page mode (faked for data segment)");
3474 Aix::_page_size = 64*K;
3475 } else {
3476 trcVerbose("4K page mode (Use64KPages=off)");
3477 Aix::_page_size = 4*K;
3478 }
3479 } else {
3480 // .. and not able to allocate 64k pages dynamically. Here, just
3481 // fall back to 4K paged mode and use mmap for everything.
3482 trcVerbose("4K page mode");
3483 Aix::_page_size = 4*K;
3484 FLAG_SET_ERGO(bool, Use64KPages, false);
3485 }
3486 } else {
3487 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3488 // This normally means that we can allocate 64k pages dynamically.
3489 // (There is one special case where this may be false: EXTSHM=on.
3490 // but we decided to not support that mode).
3491 assert0(g_multipage_support.can_use_64K_pages);
3492 Aix::_page_size = 64*K;
3493 trcVerbose("64K page mode");
3494 FLAG_SET_ERGO(bool, Use64KPages, true);
3495 }
3496
3497 // For now UseLargePages is just ignored.
3498 FLAG_SET_ERGO(bool, UseLargePages, false);
3499 _page_sizes[0] = 0;
3500
3501 // debug trace
3502 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3503
3504 // Next, we need to initialize libo4 and libperfstat libraries.
3505 if (os::Aix::on_pase()) {
3506 os::Aix::initialize_libo4();
3507 } else {
3508 os::Aix::initialize_libperfstat();
3509 }
3510
3511 // Reset the perfstat information provided by ODM.
3512 if (os::Aix::on_aix()) {
3513 libperfstat::perfstat_reset();
3514 }
3515
3516 // Now initialze basic system properties. Note that for some of the values we
3517 // need libperfstat etc.
3518 os::Aix::initialize_system_info();
3519
3520 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3521
3522 init_random(1234567);
3523
3524 // _main_thread points to the thread that created/loaded the JVM.
3525 Aix::_main_thread = pthread_self();
3526
3527 initial_time_count = os::elapsed_counter();
3528
3529 os::Posix::init();
3530 }
3531
3532 // This is called _after_ the global arguments have been parsed.
3533 jint os::init_2(void) {
3534
3535 os::Posix::init_2();
3536
3537 if (os::Aix::on_pase()) {
3538 trcVerbose("Running on PASE.");
3539 } else {
3540 trcVerbose("Running on AIX (not PASE).");
3541 }
3542
3543 trcVerbose("processor count: %d", os::_processor_count);
3544 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3545
3546 // Initially build up the loaded dll map.
3547 LoadedLibraries::reload();
3548 if (Verbose) {
3549 trcVerbose("Loaded Libraries: ");
3550 LoadedLibraries::print(tty);
3551 }
3552
3553 // initialize suspend/resume support - must do this before signal_sets_init()
3554 if (SR_initialize() != 0) {
3555 perror("SR_initialize failed");
3556 return JNI_ERR;
3557 }
3558
3559 Aix::signal_sets_init();
3560 Aix::install_signal_handlers();
3561 // Initialize data for jdk.internal.misc.Signal
3562 if (!ReduceSignalUsage) {
3563 jdk_misc_signal_init();
3564 }
3565
3566 // Check and sets minimum stack sizes against command line options
3567 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3568 return JNI_ERR;
3569 }
3570
3571 if (UseNUMA) {
3572 UseNUMA = false;
3573 warning("NUMA optimizations are not available on this OS.");
3574 }
3575
3576 if (MaxFDLimit) {
3577 // Set the number of file descriptors to max. print out error
3578 // if getrlimit/setrlimit fails but continue regardless.
3579 struct rlimit nbr_files;
3580 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3581 if (status != 0) {
3582 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3583 } else {
3584 nbr_files.rlim_cur = nbr_files.rlim_max;
3585 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3586 if (status != 0) {
3587 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3588 }
3589 }
3590 }
3591
3592 if (PerfAllowAtExitRegistration) {
3593 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3594 // At exit functions can be delayed until process exit time, which
3595 // can be problematic for embedded VM situations. Embedded VMs should
3596 // call DestroyJavaVM() to assure that VM resources are released.
3597
3598 // Note: perfMemory_exit_helper atexit function may be removed in
3599 // the future if the appropriate cleanup code can be added to the
3600 // VM_Exit VMOperation's doit method.
3601 if (atexit(perfMemory_exit_helper) != 0) {
3602 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3603 }
3604 }
3605
3606 return JNI_OK;
3607 }
3608
3609 // Mark the polling page as unreadable
3610 void os::make_polling_page_unreadable(void) {
3611 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3612 fatal("Could not disable polling page");
3613 }
3614 };
3615
3616 // Mark the polling page as readable
3617 void os::make_polling_page_readable(void) {
3618 // Changed according to os_linux.cpp.
3619 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3620 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3621 }
3622 };
3623
3624 int os::active_processor_count() {
3625 // User has overridden the number of active processors
3626 if (ActiveProcessorCount > 0) {
3627 log_trace(os)("active_processor_count: "
3628 "active processor count set by user : %d",
3629 ActiveProcessorCount);
3630 return ActiveProcessorCount;
3631 }
3632
3633 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3634 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3635 return online_cpus;
3636 }
3637
3638 void os::set_native_thread_name(const char *name) {
3639 // Not yet implemented.
3640 return;
3641 }
3642
3643 bool os::distribute_processes(uint length, uint* distribution) {
3644 // Not yet implemented.
3645 return false;
3646 }
3647
3648 bool os::bind_to_processor(uint processor_id) {
3649 // Not yet implemented.
3650 return false;
3651 }
3652
3653 void os::SuspendedThreadTask::internal_do_task() {
3654 if (do_suspend(_thread->osthread())) {
3655 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3656 do_task(context);
3657 do_resume(_thread->osthread());
3658 }
3659 }
3660
3661 ////////////////////////////////////////////////////////////////////////////////
3662 // debug support
3663
3664 bool os::find(address addr, outputStream* st) {
3665
3666 st->print(PTR_FORMAT ": ", addr);
3667
3668 loaded_module_t lm;
3669 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3670 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3671 st->print_cr("%s", lm.path);
3672 return true;
3673 }
3674
3675 return false;
3676 }
3677
3678 ////////////////////////////////////////////////////////////////////////////////
3679 // misc
3680
3681 // This does not do anything on Aix. This is basically a hook for being
3682 // able to use structured exception handling (thread-local exception filters)
3683 // on, e.g., Win32.
3684 void
3685 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3686 JavaCallArguments* args, Thread* thread) {
3687 f(value, method, args, thread);
3688 }
3689
3690 void os::print_statistics() {
3691 }
3692
3693 bool os::message_box(const char* title, const char* message) {
3694 int i;
3695 fdStream err(defaultStream::error_fd());
3696 for (i = 0; i < 78; i++) err.print_raw("=");
3697 err.cr();
3698 err.print_raw_cr(title);
3699 for (i = 0; i < 78; i++) err.print_raw("-");
3700 err.cr();
3701 err.print_raw_cr(message);
3702 for (i = 0; i < 78; i++) err.print_raw("=");
3703 err.cr();
3704
3705 char buf[16];
3706 // Prevent process from exiting upon "read error" without consuming all CPU
3707 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3708
3709 return buf[0] == 'y' || buf[0] == 'Y';
3710 }
3711
3712 // Is a (classpath) directory empty?
3713 bool os::dir_is_empty(const char* path) {
3714 DIR *dir = NULL;
3715 struct dirent *ptr;
3716
3717 dir = opendir(path);
3718 if (dir == NULL) return true;
3719
3720 /* Scan the directory */
3721 bool result = true;
3722 while (result && (ptr = readdir(dir)) != NULL) {
3723 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3724 result = false;
3725 }
3726 }
3727 closedir(dir);
3728 return result;
3729 }
3730
3731 // This code originates from JDK's sysOpen and open64_w
3732 // from src/solaris/hpi/src/system_md.c
3733
3734 int os::open(const char *path, int oflag, int mode) {
3735
3736 if (strlen(path) > MAX_PATH - 1) {
3737 errno = ENAMETOOLONG;
3738 return -1;
3739 }
3740 int fd;
3741
3742 fd = ::open64(path, oflag, mode);
3743 if (fd == -1) return -1;
3744
3745 // If the open succeeded, the file might still be a directory.
3746 {
3747 struct stat64 buf64;
3748 int ret = ::fstat64(fd, &buf64);
3749 int st_mode = buf64.st_mode;
3750
3751 if (ret != -1) {
3752 if ((st_mode & S_IFMT) == S_IFDIR) {
3753 errno = EISDIR;
3754 ::close(fd);
3755 return -1;
3756 }
3757 } else {
3758 ::close(fd);
3759 return -1;
3760 }
3761 }
3762
3763 // All file descriptors that are opened in the JVM and not
3764 // specifically destined for a subprocess should have the
3765 // close-on-exec flag set. If we don't set it, then careless 3rd
3766 // party native code might fork and exec without closing all
3767 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3768 // UNIXProcess.c), and this in turn might:
3769 //
3770 // - cause end-of-file to fail to be detected on some file
3771 // descriptors, resulting in mysterious hangs, or
3772 //
3773 // - might cause an fopen in the subprocess to fail on a system
3774 // suffering from bug 1085341.
3775 //
3776 // (Yes, the default setting of the close-on-exec flag is a Unix
3777 // design flaw.)
3778 //
3779 // See:
3780 // 1085341: 32-bit stdio routines should support file descriptors >255
3781 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3782 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3783 #ifdef FD_CLOEXEC
3784 {
3785 int flags = ::fcntl(fd, F_GETFD);
3786 if (flags != -1)
3787 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3788 }
3789 #endif
3790
3791 return fd;
3792 }
3793
3794 // create binary file, rewriting existing file if required
3795 int os::create_binary_file(const char* path, bool rewrite_existing) {
3796 int oflags = O_WRONLY | O_CREAT;
3797 if (!rewrite_existing) {
3798 oflags |= O_EXCL;
3799 }
3800 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3801 }
3802
3803 // return current position of file pointer
3804 jlong os::current_file_offset(int fd) {
3805 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3806 }
3807
3808 // move file pointer to the specified offset
3809 jlong os::seek_to_file_offset(int fd, jlong offset) {
3810 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3811 }
3812
3813 // This code originates from JDK's sysAvailable
3814 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3815
3816 int os::available(int fd, jlong *bytes) {
3817 jlong cur, end;
3818 int mode;
3819 struct stat64 buf64;
3820
3821 if (::fstat64(fd, &buf64) >= 0) {
3822 mode = buf64.st_mode;
3823 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3824 int n;
3825 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3826 *bytes = n;
3827 return 1;
3828 }
3829 }
3830 }
3831 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3832 return 0;
3833 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3834 return 0;
3835 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3836 return 0;
3837 }
3838 *bytes = end - cur;
3839 return 1;
3840 }
3841
3842 // Map a block of memory.
3843 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3844 char *addr, size_t bytes, bool read_only,
3845 bool allow_exec) {
3846 int prot;
3847 int flags = MAP_PRIVATE;
3848
3849 if (read_only) {
3850 prot = PROT_READ;
3851 flags = MAP_SHARED;
3852 } else {
3853 prot = PROT_READ | PROT_WRITE;
3854 flags = MAP_PRIVATE;
3855 }
3856
3857 if (allow_exec) {
3858 prot |= PROT_EXEC;
3859 }
3860
3861 if (addr != NULL) {
3862 flags |= MAP_FIXED;
3863 }
3864
3865 // Allow anonymous mappings if 'fd' is -1.
3866 if (fd == -1) {
3867 flags |= MAP_ANONYMOUS;
3868 }
3869
3870 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3871 fd, file_offset);
3872 if (mapped_address == MAP_FAILED) {
3873 return NULL;
3874 }
3875 return mapped_address;
3876 }
3877
3878 // Remap a block of memory.
3879 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3880 char *addr, size_t bytes, bool read_only,
3881 bool allow_exec) {
3882 // same as map_memory() on this OS
3883 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3884 allow_exec);
3885 }
3886
3887 // Unmap a block of memory.
3888 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3889 return munmap(addr, bytes) == 0;
3890 }
3891
3892 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3893 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3894 // of a thread.
3895 //
3896 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3897 // the fast estimate available on the platform.
3898
3899 jlong os::current_thread_cpu_time() {
3900 // return user + sys since the cost is the same
3901 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3902 assert(n >= 0, "negative CPU time");
3903 return n;
3904 }
3905
3906 jlong os::thread_cpu_time(Thread* thread) {
3907 // consistent with what current_thread_cpu_time() returns
3908 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3909 assert(n >= 0, "negative CPU time");
3910 return n;
3911 }
3912
3913 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3914 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3915 assert(n >= 0, "negative CPU time");
3916 return n;
3917 }
3918
3919 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3920 bool error = false;
3921
3922 jlong sys_time = 0;
3923 jlong user_time = 0;
3924
3925 // Reimplemented using getthrds64().
3926 //
3927 // Works like this:
3928 // For the thread in question, get the kernel thread id. Then get the
3929 // kernel thread statistics using that id.
3930 //
3931 // This only works of course when no pthread scheduling is used,
3932 // i.e. there is a 1:1 relationship to kernel threads.
3933 // On AIX, see AIXTHREAD_SCOPE variable.
3934
3935 pthread_t pthtid = thread->osthread()->pthread_id();
3936
3937 // retrieve kernel thread id for the pthread:
3938 tid64_t tid = 0;
3939 struct __pthrdsinfo pinfo;
3940 // I just love those otherworldly IBM APIs which force me to hand down
3941 // dummy buffers for stuff I dont care for...
3942 char dummy[1];
3943 int dummy_size = sizeof(dummy);
3944 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3945 dummy, &dummy_size) == 0) {
3946 tid = pinfo.__pi_tid;
3947 } else {
3948 tty->print_cr("pthread_getthrds_np failed.");
3949 error = true;
3950 }
3951
3952 // retrieve kernel timing info for that kernel thread
3953 if (!error) {
3954 struct thrdentry64 thrdentry;
3955 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3956 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3957 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3958 } else {
3959 tty->print_cr("pthread_getthrds_np failed.");
3960 error = true;
3961 }
3962 }
3963
3964 if (p_sys_time) {
3965 *p_sys_time = sys_time;
3966 }
3967
3968 if (p_user_time) {
3969 *p_user_time = user_time;
3970 }
3971
3972 if (error) {
3973 return false;
3974 }
3975
3976 return true;
3977 }
3978
3979 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3980 jlong sys_time;
3981 jlong user_time;
3982
3983 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3984 return -1;
3985 }
3986
3987 return user_sys_cpu_time ? sys_time + user_time : user_time;
3988 }
3989
3990 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3991 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3992 info_ptr->may_skip_backward = false; // elapsed time not wall time
3993 info_ptr->may_skip_forward = false; // elapsed time not wall time
3994 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3995 }
3996
3997 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3998 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3999 info_ptr->may_skip_backward = false; // elapsed time not wall time
4000 info_ptr->may_skip_forward = false; // elapsed time not wall time
4001 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4002 }
4003
4004 bool os::is_thread_cpu_time_supported() {
4005 return true;
4006 }
4007
4008 // System loadavg support. Returns -1 if load average cannot be obtained.
4009 // For now just return the system wide load average (no processor sets).
4010 int os::loadavg(double values[], int nelem) {
4011
4012 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4013 guarantee(values, "argument error");
4014
4015 if (os::Aix::on_pase()) {
4016
4017 // AS/400 PASE: use libo4 porting library
4018 double v[3] = { 0.0, 0.0, 0.0 };
4019
4020 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4021 for (int i = 0; i < nelem; i ++) {
4022 values[i] = v[i];
4023 }
4024 return nelem;
4025 } else {
4026 return -1;
4027 }
4028
4029 } else {
4030
4031 // AIX: use libperfstat
4032 libperfstat::cpuinfo_t ci;
4033 if (libperfstat::get_cpuinfo(&ci)) {
4034 for (int i = 0; i < nelem; i++) {
4035 values[i] = ci.loadavg[i];
4036 }
4037 } else {
4038 return -1;
4039 }
4040 return nelem;
4041 }
4042 }
4043
4044 void os::pause() {
4045 char filename[MAX_PATH];
4046 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4047 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4048 } else {
4049 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4050 }
4051
4052 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4053 if (fd != -1) {
4054 struct stat buf;
4055 ::close(fd);
4056 while (::stat(filename, &buf) == 0) {
4057 (void)::poll(NULL, 0, 100);
4058 }
4059 } else {
4060 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4061 }
4062 }
4063
4064 bool os::is_primordial_thread(void) {
4065 if (pthread_self() == (pthread_t)1) {
4066 return true;
4067 } else {
4068 return false;
4069 }
4070 }
4071
4072 // OS recognitions (PASE/AIX, OS level) call this before calling any
4073 // one of Aix::on_pase(), Aix::os_version() static
4074 void os::Aix::initialize_os_info() {
4075
4076 assert(_on_pase == -1 && _os_version == 0, "already called.");
4077
4078 struct utsname uts;
4079 memset(&uts, 0, sizeof(uts));
4080 strcpy(uts.sysname, "?");
4081 if (::uname(&uts) == -1) {
4082 trcVerbose("uname failed (%d)", errno);
4083 guarantee(0, "Could not determine whether we run on AIX or PASE");
4084 } else {
4085 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4086 "node \"%s\" machine \"%s\"\n",
4087 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4088 const int major = atoi(uts.version);
4089 assert(major > 0, "invalid OS version");
4090 const int minor = atoi(uts.release);
4091 assert(minor > 0, "invalid OS release");
4092 _os_version = (major << 24) | (minor << 16);
4093 char ver_str[20] = {0};
4094 char *name_str = "unknown OS";
4095 if (strcmp(uts.sysname, "OS400") == 0) {
4096 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4097 _on_pase = 1;
4098 if (os_version_short() < 0x0504) {
4099 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4100 assert(false, "OS/400 release too old.");
4101 }
4102 name_str = "OS/400 (pase)";
4103 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4104 } else if (strcmp(uts.sysname, "AIX") == 0) {
4105 // We run on AIX. We do not support versions older than AIX 5.3.
4106 _on_pase = 0;
4107 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4108 odmWrapper::determine_os_kernel_version(&_os_version);
4109 if (os_version_short() < 0x0503) {
4110 trcVerbose("AIX release older than AIX 5.3 not supported.");
4111 assert(false, "AIX release too old.");
4112 }
4113 name_str = "AIX";
4114 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4115 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4116 } else {
4117 assert(false, name_str);
4118 }
4119 trcVerbose("We run on %s %s", name_str, ver_str);
4120 }
4121
4122 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4123 } // end: os::Aix::initialize_os_info()
4124
4125 // Scan environment for important settings which might effect the VM.
4126 // Trace out settings. Warn about invalid settings and/or correct them.
4127 //
4128 // Must run after os::Aix::initialue_os_info().
4129 void os::Aix::scan_environment() {
4130
4131 char* p;
4132 int rc;
4133
4134 // Warn explicity if EXTSHM=ON is used. That switch changes how
4135 // System V shared memory behaves. One effect is that page size of
4136 // shared memory cannot be change dynamically, effectivly preventing
4137 // large pages from working.
4138 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4139 // recommendation is (in OSS notes) to switch it off.
4140 p = ::getenv("EXTSHM");
4141 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4142 if (p && strcasecmp(p, "ON") == 0) {
4143 _extshm = 1;
4144 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4145 if (!AllowExtshm) {
4146 // We allow under certain conditions the user to continue. However, we want this
4147 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4148 // that the VM is not able to allocate 64k pages for the heap.
4149 // We do not want to run with reduced performance.
4150 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4151 }
4152 } else {
4153 _extshm = 0;
4154 }
4155
4156 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4157 // Not tested, not supported.
4158 //
4159 // Note that it might be worth the trouble to test and to require it, if only to
4160 // get useful return codes for mprotect.
4161 //
4162 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4163 // exec() ? before loading the libjvm ? ....)
4164 p = ::getenv("XPG_SUS_ENV");
4165 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4166 if (p && strcmp(p, "ON") == 0) {
4167 _xpg_sus_mode = 1;
4168 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4169 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4170 // clobber address ranges. If we ever want to support that, we have to do some
4171 // testing first.
4172 guarantee(false, "XPG_SUS_ENV=ON not supported");
4173 } else {
4174 _xpg_sus_mode = 0;
4175 }
4176
4177 if (os::Aix::on_pase()) {
4178 p = ::getenv("QIBM_MULTI_THREADED");
4179 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4180 }
4181
4182 p = ::getenv("LDR_CNTRL");
4183 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4184 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4185 if (p && ::strstr(p, "TEXTPSIZE")) {
4186 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4187 "you may experience hangs or crashes on OS/400 V7R1.");
4188 }
4189 }
4190
4191 p = ::getenv("AIXTHREAD_GUARDPAGES");
4192 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4193
4194 } // end: os::Aix::scan_environment()
4195
4196 // PASE: initialize the libo4 library (PASE porting library).
4197 void os::Aix::initialize_libo4() {
4198 guarantee(os::Aix::on_pase(), "OS/400 only.");
4199 if (!libo4::init()) {
4200 trcVerbose("libo4 initialization failed.");
4201 assert(false, "libo4 initialization failed");
4202 } else {
4203 trcVerbose("libo4 initialized.");
4204 }
4205 }
4206
4207 // AIX: initialize the libperfstat library.
4208 void os::Aix::initialize_libperfstat() {
4209 assert(os::Aix::on_aix(), "AIX only");
4210 if (!libperfstat::init()) {
4211 trcVerbose("libperfstat initialization failed.");
4212 assert(false, "libperfstat initialization failed");
4213 } else {
4214 trcVerbose("libperfstat initialized.");
4215 }
4216 }
4217
4218 /////////////////////////////////////////////////////////////////////////////
4219 // thread stack
4220
4221 // Get the current stack base from the OS (actually, the pthread library).
4222 // Note: usually not page aligned.
4223 address os::current_stack_base() {
4224 AixMisc::stackbounds_t bounds;
4225 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4226 guarantee(rc, "Unable to retrieve stack bounds.");
4227 return bounds.base;
4228 }
4229
4230 // Get the current stack size from the OS (actually, the pthread library).
4231 // Returned size is such that (base - size) is always aligned to page size.
4232 size_t os::current_stack_size() {
4233 AixMisc::stackbounds_t bounds;
4234 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4235 guarantee(rc, "Unable to retrieve stack bounds.");
4236 // Align the returned stack size such that the stack low address
4237 // is aligned to page size (Note: base is usually not and we do not care).
4238 // We need to do this because caller code will assume stack low address is
4239 // page aligned and will place guard pages without checking.
4240 address low = bounds.base - bounds.size;
4241 address low_aligned = (address)align_up(low, os::vm_page_size());
4242 size_t s = bounds.base - low_aligned;
4243 return s;
4244 }
4245
4246 extern char** environ;
4247
4248 // Run the specified command in a separate process. Return its exit value,
4249 // or -1 on failure (e.g. can't fork a new process).
4250 // Unlike system(), this function can be called from signal handler. It
4251 // doesn't block SIGINT et al.
4252 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4253 char * argv[4] = {"sh", "-c", cmd, NULL};
4254
4255 pid_t pid = fork();
4256
4257 if (pid < 0) {
4258 // fork failed
4259 return -1;
4260
4261 } else if (pid == 0) {
4262 // child process
4263
4264 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4265 execve("/usr/bin/sh", argv, environ);
4266
4267 // execve failed
4268 _exit(-1);
4269
4270 } else {
4271 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4272 // care about the actual exit code, for now.
4273
4274 int status;
4275
4276 // Wait for the child process to exit. This returns immediately if
4277 // the child has already exited. */
4278 while (waitpid(pid, &status, 0) < 0) {
4279 switch (errno) {
4280 case ECHILD: return 0;
4281 case EINTR: break;
4282 default: return -1;
4283 }
4284 }
4285
4286 if (WIFEXITED(status)) {
4287 // The child exited normally; get its exit code.
4288 return WEXITSTATUS(status);
4289 } else if (WIFSIGNALED(status)) {
4290 // The child exited because of a signal.
4291 // The best value to return is 0x80 + signal number,
4292 // because that is what all Unix shells do, and because
4293 // it allows callers to distinguish between process exit and
4294 // process death by signal.
4295 return 0x80 + WTERMSIG(status);
4296 } else {
4297 // Unknown exit code; pass it through.
4298 return status;
4299 }
4300 }
4301 return -1;
4302 }
4303
4304 // Get the default path to the core file
4305 // Returns the length of the string
4306 int os::get_core_path(char* buffer, size_t bufferSize) {
4307 const char* p = get_current_directory(buffer, bufferSize);
4308
4309 if (p == NULL) {
4310 assert(p != NULL, "failed to get current directory");
4311 return 0;
4312 }
4313
4314 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4315 p, current_process_id());
4316
4317 return strlen(buffer);
4318 }
4319
4320 #ifndef PRODUCT
4321 void TestReserveMemorySpecial_test() {
4322 // No tests available for this platform
4323 }
4324 #endif
4325
4326 bool os::start_debugging(char *buf, int buflen) {
4327 int len = (int)strlen(buf);
4328 char *p = &buf[len];
4329
4330 jio_snprintf(p, buflen -len,
4331 "\n\n"
4332 "Do you want to debug the problem?\n\n"
4333 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4334 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4335 "Otherwise, press RETURN to abort...",
4336 os::current_process_id(),
4337 os::current_thread_id(), thread_self());
4338
4339 bool yes = os::message_box("Unexpected Error", buf);
4340
4341 if (yes) {
4342 // yes, user asked VM to launch debugger
4343 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4344
4345 os::fork_and_exec(buf);
4346 yes = false;
4347 }
4348 return yes;
4349 }
4350
4351 static inline time_t get_mtime(const char* filename) {
4352 struct stat st;
4353 int ret = os::stat(filename, &st);
4354 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4355 return st.st_mtime;
4356 }
4357
4358 int os::compare_file_modified_times(const char* file1, const char* file2) {
4359 time_t t1 = get_mtime(file1);
4360 time_t t2 = get_mtime(file2);
4361 return t1 - t2;
4362 }