1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2019 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "libo4.hpp"
42 #include "libperfstat_aix.hpp"
43 #include "libodm_aix.hpp"
44 #include "loadlib_aix.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/filemap.hpp"
47 #include "misc_aix.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "os_aix.inline.hpp"
50 #include "os_share_aix.hpp"
51 #include "porting_aix.hpp"
52 #include "prims/jniFastGetField.hpp"
53 #include "prims/jvm_misc.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/extendedPC.hpp"
57 #include "runtime/globals.hpp"
58 #include "runtime/interfaceSupport.inline.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/mutexLocker.hpp"
62 #include "runtime/objectMonitor.hpp"
63 #include "runtime/orderAccess.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/osThread.hpp"
66 #include "runtime/perfMemory.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/statSampler.hpp"
69 #include "runtime/stubRoutines.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadCritical.hpp"
72 #include "runtime/timer.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "services/attachListener.hpp"
75 #include "services/runtimeService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/decoder.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/vmError.hpp"
82
83 // put OS-includes here (sorted alphabetically)
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <inttypes.h>
87 #include <poll.h>
88 #include <procinfo.h>
89 #include <pthread.h>
90 #include <pwd.h>
91 #include <semaphore.h>
92 #include <signal.h>
93 #include <stdint.h>
94 #include <stdio.h>
95 #include <string.h>
96 #include <unistd.h>
97 #include <sys/ioctl.h>
98 #include <sys/ipc.h>
99 #include <sys/mman.h>
100 #include <sys/resource.h>
101 #include <sys/select.h>
102 #include <sys/shm.h>
103 #include <sys/socket.h>
104 #include <sys/stat.h>
105 #include <sys/sysinfo.h>
106 #include <sys/systemcfg.h>
107 #include <sys/time.h>
108 #include <sys/times.h>
109 #include <sys/types.h>
110 #include <sys/utsname.h>
111 #include <sys/vminfo.h>
112 #include <sys/wait.h>
113
114 // Missing prototypes for various system APIs.
115 extern "C"
116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
117
118 #if !defined(_AIXVERSION_610)
119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
121 extern "C" int getargs(procsinfo*, int, char*, int);
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128 // for multipage initialization error analysis (in 'g_multipage_error')
129 #define ERROR_MP_OS_TOO_OLD 100
130 #define ERROR_MP_EXTSHM_ACTIVE 101
131 #define ERROR_MP_VMGETINFO_FAILED 102
132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
133
134 // excerpts from systemcfg.h that might be missing on older os levels
135 #ifndef PV_5_Compat
136 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
137 #endif
138 #ifndef PV_6
139 #define PV_6 0x100000 /* Power PC 6 */
140 #endif
141 #ifndef PV_6_1
142 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
143 #endif
144 #ifndef PV_6_Compat
145 #define PV_6_Compat 0x108000 /* Power PC 6 */
146 #endif
147 #ifndef PV_7
148 #define PV_7 0x200000 /* Power PC 7 */
149 #endif
150 #ifndef PV_7_Compat
151 #define PV_7_Compat 0x208000 /* Power PC 7 */
152 #endif
153 #ifndef PV_8
154 #define PV_8 0x300000 /* Power PC 8 */
155 #endif
156 #ifndef PV_8_Compat
157 #define PV_8_Compat 0x308000 /* Power PC 8 */
158 #endif
159
160 static address resolve_function_descriptor_to_code_pointer(address p);
161
162 static void vmembk_print_on(outputStream* os);
163
164 ////////////////////////////////////////////////////////////////////////////////
165 // global variables (for a description see os_aix.hpp)
166
167 julong os::Aix::_physical_memory = 0;
168
169 pthread_t os::Aix::_main_thread = ((pthread_t)0);
170 int os::Aix::_page_size = -1;
171
172 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
173 int os::Aix::_on_pase = -1;
174
175 // 0 = uninitialized, otherwise 32 bit number:
176 // 0xVVRRTTSS
177 // VV - major version
178 // RR - minor version
179 // TT - tech level, if known, 0 otherwise
180 // SS - service pack, if known, 0 otherwise
181 uint32_t os::Aix::_os_version = 0;
182
183 // -1 = uninitialized, 0 - no, 1 - yes
184 int os::Aix::_xpg_sus_mode = -1;
185
186 // -1 = uninitialized, 0 - no, 1 - yes
187 int os::Aix::_extshm = -1;
188
189 ////////////////////////////////////////////////////////////////////////////////
190 // local variables
191
192 static volatile jlong max_real_time = 0;
193 static jlong initial_time_count = 0;
194 static int clock_tics_per_sec = 100;
195 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
196 static bool check_signals = true;
197 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
198 static sigset_t SR_sigset;
199
200 // Process break recorded at startup.
201 static address g_brk_at_startup = NULL;
202
203 // This describes the state of multipage support of the underlying
204 // OS. Note that this is of no interest to the outsize world and
205 // therefore should not be defined in AIX class.
206 //
207 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
208 // latter two (16M "large" resp. 16G "huge" pages) require special
209 // setup and are normally not available.
210 //
211 // AIX supports multiple page sizes per process, for:
212 // - Stack (of the primordial thread, so not relevant for us)
213 // - Data - data, bss, heap, for us also pthread stacks
214 // - Text - text code
215 // - shared memory
216 //
217 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
218 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
219 //
220 // For shared memory, page size can be set dynamically via
221 // shmctl(). Different shared memory regions can have different page
222 // sizes.
223 //
224 // More information can be found at AIBM info center:
225 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
226 //
227 static struct {
228 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
229 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
230 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
231 size_t pthr_stack_pagesize; // stack page size of pthread threads
232 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
233 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
234 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
235 int error; // Error describing if something went wrong at multipage init.
236 } g_multipage_support = {
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 (size_t) -1,
241 (size_t) -1,
242 false, false,
243 0
244 };
245
246 // We must not accidentally allocate memory close to the BRK - even if
247 // that would work - because then we prevent the BRK segment from
248 // growing which may result in a malloc OOM even though there is
249 // enough memory. The problem only arises if we shmat() or mmap() at
250 // a specific wish address, e.g. to place the heap in a
251 // compressed-oops-friendly way.
252 static bool is_close_to_brk(address a) {
253 assert0(g_brk_at_startup != NULL);
254 if (a >= g_brk_at_startup &&
255 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
256 return true;
257 }
258 return false;
259 }
260
261 julong os::available_memory() {
262 return Aix::available_memory();
263 }
264
265 julong os::Aix::available_memory() {
266 // Avoid expensive API call here, as returned value will always be null.
267 if (os::Aix::on_pase()) {
268 return 0x0LL;
269 }
270 os::Aix::meminfo_t mi;
271 if (os::Aix::get_meminfo(&mi)) {
272 return mi.real_free;
273 } else {
274 return ULONG_MAX;
275 }
276 }
277
278 julong os::physical_memory() {
279 return Aix::physical_memory();
280 }
281
282 // Return true if user is running as root.
283
284 bool os::have_special_privileges() {
285 static bool init = false;
286 static bool privileges = false;
287 if (!init) {
288 privileges = (getuid() != geteuid()) || (getgid() != getegid());
289 init = true;
290 }
291 return privileges;
292 }
293
294 // Helper function, emulates disclaim64 using multiple 32bit disclaims
295 // because we cannot use disclaim64() on AS/400 and old AIX releases.
296 static bool my_disclaim64(char* addr, size_t size) {
297
298 if (size == 0) {
299 return true;
300 }
301
302 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
303 const unsigned int maxDisclaimSize = 0x40000000;
304
305 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
306 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
307
308 char* p = addr;
309
310 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
311 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
312 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
313 return false;
314 }
315 p += maxDisclaimSize;
316 }
317
318 if (lastDisclaimSize > 0) {
319 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
320 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
321 return false;
322 }
323 }
324
325 return true;
326 }
327
328 // Cpu architecture string
329 #if defined(PPC32)
330 static char cpu_arch[] = "ppc";
331 #elif defined(PPC64)
332 static char cpu_arch[] = "ppc64";
333 #else
334 #error Add appropriate cpu_arch setting
335 #endif
336
337 // Wrap the function "vmgetinfo" which is not available on older OS releases.
338 static int checked_vmgetinfo(void *out, int command, int arg) {
339 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
340 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
341 }
342 return ::vmgetinfo(out, command, arg);
343 }
344
345 // Given an address, returns the size of the page backing that address.
346 size_t os::Aix::query_pagesize(void* addr) {
347
348 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
349 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
350 return 4*K;
351 }
352
353 vm_page_info pi;
354 pi.addr = (uint64_t)addr;
355 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
356 return pi.pagesize;
357 } else {
358 assert(false, "vmgetinfo failed to retrieve page size");
359 return 4*K;
360 }
361 }
362
363 void os::Aix::initialize_system_info() {
364
365 // Get the number of online(logical) cpus instead of configured.
366 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
367 assert(_processor_count > 0, "_processor_count must be > 0");
368
369 // Retrieve total physical storage.
370 os::Aix::meminfo_t mi;
371 if (!os::Aix::get_meminfo(&mi)) {
372 assert(false, "os::Aix::get_meminfo failed.");
373 }
374 _physical_memory = (julong) mi.real_total;
375 }
376
377 // Helper function for tracing page sizes.
378 static const char* describe_pagesize(size_t pagesize) {
379 switch (pagesize) {
380 case 4*K : return "4K";
381 case 64*K: return "64K";
382 case 16*M: return "16M";
383 case 16*G: return "16G";
384 default:
385 assert(false, "surprise");
386 return "??";
387 }
388 }
389
390 // Probe OS for multipage support.
391 // Will fill the global g_multipage_support structure.
392 // Must be called before calling os::large_page_init().
393 static void query_multipage_support() {
394
395 guarantee(g_multipage_support.pagesize == -1,
396 "do not call twice");
397
398 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
399
400 // This really would surprise me.
401 assert(g_multipage_support.pagesize == 4*K, "surprise!");
402
403 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
404 // Default data page size is defined either by linker options (-bdatapsize)
405 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
406 // default should be 4K.
407 {
408 void* p = ::malloc(16*M);
409 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
410 ::free(p);
411 }
412
413 // Query default shm page size (LDR_CNTRL SHMPSIZE).
414 // Note that this is pure curiosity. We do not rely on default page size but set
415 // our own page size after allocated.
416 {
417 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
418 guarantee(shmid != -1, "shmget failed");
419 void* p = ::shmat(shmid, NULL, 0);
420 ::shmctl(shmid, IPC_RMID, NULL);
421 guarantee(p != (void*) -1, "shmat failed");
422 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
423 ::shmdt(p);
424 }
425
426 // Before querying the stack page size, make sure we are not running as primordial
427 // thread (because primordial thread's stack may have different page size than
428 // pthread thread stacks). Running a VM on the primordial thread won't work for a
429 // number of reasons so we may just as well guarantee it here.
430 guarantee0(!os::is_primordial_thread());
431
432 // Query pthread stack page size. Should be the same as data page size because
433 // pthread stacks are allocated from C-Heap.
434 {
435 int dummy = 0;
436 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
437 }
438
439 // Query default text page size (LDR_CNTRL TEXTPSIZE).
440 {
441 address any_function =
442 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
443 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
444 }
445
446 // Now probe for support of 64K pages and 16M pages.
447
448 // Before OS/400 V6R1, there is no support for pages other than 4K.
449 if (os::Aix::on_pase_V5R4_or_older()) {
450 trcVerbose("OS/400 < V6R1 - no large page support.");
451 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
452 goto query_multipage_support_end;
453 }
454
455 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
456 {
457 const int MAX_PAGE_SIZES = 4;
458 psize_t sizes[MAX_PAGE_SIZES];
459 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
460 if (num_psizes == -1) {
461 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
462 trcVerbose("disabling multipage support.");
463 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
464 goto query_multipage_support_end;
465 }
466 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
467 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
468 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
469 for (int i = 0; i < num_psizes; i ++) {
470 trcVerbose(" %s ", describe_pagesize(sizes[i]));
471 }
472
473 // Can we use 64K, 16M pages?
474 for (int i = 0; i < num_psizes; i ++) {
475 const size_t pagesize = sizes[i];
476 if (pagesize != 64*K && pagesize != 16*M) {
477 continue;
478 }
479 bool can_use = false;
480 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
481 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
482 IPC_CREAT | S_IRUSR | S_IWUSR);
483 guarantee0(shmid != -1); // Should always work.
484 // Try to set pagesize.
485 struct shmid_ds shm_buf = { 0 };
486 shm_buf.shm_pagesize = pagesize;
487 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
488 const int en = errno;
489 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
490 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno);
491 } else {
492 // Attach and double check pageisze.
493 void* p = ::shmat(shmid, NULL, 0);
494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
495 guarantee0(p != (void*) -1); // Should always work.
496 const size_t real_pagesize = os::Aix::query_pagesize(p);
497 if (real_pagesize != pagesize) {
498 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize);
499 } else {
500 can_use = true;
501 }
502 ::shmdt(p);
503 }
504 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
505 if (pagesize == 64*K) {
506 g_multipage_support.can_use_64K_pages = can_use;
507 } else if (pagesize == 16*M) {
508 g_multipage_support.can_use_16M_pages = can_use;
509 }
510 }
511
512 } // end: check which pages can be used for shared memory
513
514 query_multipage_support_end:
515
516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
517 describe_pagesize(g_multipage_support.pagesize));
518 trcVerbose("Data page size (C-Heap, bss, etc): %s",
519 describe_pagesize(g_multipage_support.datapsize));
520 trcVerbose("Text page size: %s",
521 describe_pagesize(g_multipage_support.textpsize));
522 trcVerbose("Thread stack page size (pthread): %s",
523 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
524 trcVerbose("Default shared memory page size: %s",
525 describe_pagesize(g_multipage_support.shmpsize));
526 trcVerbose("Can use 64K pages dynamically with shared 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 #ifndef OVERRIDE_LIBPATH
545 #define DEFAULT_LIBPATH "/lib:/usr/lib"
546 #else
547 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
548 #endif
549 #define EXTENSIONS_DIR "/lib/ext"
550
551 // Buffer that fits several sprintfs.
552 // Note that the space for the trailing null is provided
553 // by the nulls included by the sizeof operator.
554 const size_t bufsize =
555 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
556 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
557 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
558
559 // sysclasspath, java_home, dll_dir
560 {
561 char *pslash;
562 os::jvm_path(buf, bufsize);
563
564 // Found the full path to libjvm.so.
565 // Now cut the path to <java_home>/jre if we can.
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /libjvm.so.
569 }
570 pslash = strrchr(buf, '/');
571 if (pslash != NULL) {
572 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
573 }
574 Arguments::set_dll_dir(buf);
575
576 if (pslash != NULL) {
577 pslash = strrchr(buf, '/');
578 if (pslash != NULL) {
579 *pslash = '\0'; // Get rid of /lib.
580 }
581 }
582 Arguments::set_java_home(buf);
583 if (!set_boot_path('/', ':')) {
584 vm_exit_during_initialization("Failed setting boot class path.", NULL);
585 }
586 }
587
588 // Where to look for native libraries.
589
590 // On Aix we get the user setting of LIBPATH.
591 // Eventually, all the library path setting will be done here.
592 // Get the user setting of LIBPATH.
593 const char *v = ::getenv("LIBPATH");
594 const char *v_colon = ":";
595 if (v == NULL) { v = ""; v_colon = ""; }
596
597 // Concatenate user and invariant part of ld_library_path.
598 // That's +1 for the colon and +1 for the trailing '\0'.
599 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
600 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
601 Arguments::set_library_path(ld_library_path);
602 FREE_C_HEAP_ARRAY(char, ld_library_path);
603
604 // Extensions directories.
605 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
606 Arguments::set_ext_dirs(buf);
607
608 FREE_C_HEAP_ARRAY(char, buf);
609
610 #undef DEFAULT_LIBPATH
611 #undef EXTENSIONS_DIR
612 }
613
614 ////////////////////////////////////////////////////////////////////////////////
615 // breakpoint support
616
617 void os::breakpoint() {
618 BREAKPOINT;
619 }
620
621 extern "C" void breakpoint() {
622 // use debugger to set breakpoint here
623 }
624
625 ////////////////////////////////////////////////////////////////////////////////
626 // signal support
627
628 debug_only(static bool signal_sets_initialized = false);
629 static sigset_t unblocked_sigs, vm_sigs;
630
631 void os::Aix::signal_sets_init() {
632 // Should also have an assertion stating we are still single-threaded.
633 assert(!signal_sets_initialized, "Already initialized");
634 // Fill in signals that are necessarily unblocked for all threads in
635 // the VM. Currently, we unblock the following signals:
636 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
637 // by -Xrs (=ReduceSignalUsage));
638 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
639 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
640 // the dispositions or masks wrt these signals.
641 // Programs embedding the VM that want to use the above signals for their
642 // own purposes must, at this time, use the "-Xrs" option to prevent
643 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
644 // (See bug 4345157, and other related bugs).
645 // In reality, though, unblocking these signals is really a nop, since
646 // these signals are not blocked by default.
647 sigemptyset(&unblocked_sigs);
648 sigaddset(&unblocked_sigs, SIGILL);
649 sigaddset(&unblocked_sigs, SIGSEGV);
650 sigaddset(&unblocked_sigs, SIGBUS);
651 sigaddset(&unblocked_sigs, SIGFPE);
652 sigaddset(&unblocked_sigs, SIGTRAP);
653 sigaddset(&unblocked_sigs, SR_signum);
654
655 if (!ReduceSignalUsage) {
656 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
657 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
658 }
659 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
660 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
661 }
662 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
663 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
664 }
665 }
666 // Fill in signals that are blocked by all but the VM thread.
667 sigemptyset(&vm_sigs);
668 if (!ReduceSignalUsage)
669 sigaddset(&vm_sigs, BREAK_SIGNAL);
670 debug_only(signal_sets_initialized = true);
671 }
672
673 // These are signals that are unblocked while a thread is running Java.
674 // (For some reason, they get blocked by default.)
675 sigset_t* os::Aix::unblocked_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &unblocked_sigs;
678 }
679
680 // These are the signals that are blocked while a (non-VM) thread is
681 // running Java. Only the VM thread handles these signals.
682 sigset_t* os::Aix::vm_signals() {
683 assert(signal_sets_initialized, "Not initialized");
684 return &vm_sigs;
685 }
686
687 void os::Aix::hotspot_sigmask(Thread* thread) {
688
689 //Save caller's signal mask before setting VM signal mask
690 sigset_t caller_sigmask;
691 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
692
693 OSThread* osthread = thread->osthread();
694 osthread->set_caller_sigmask(caller_sigmask);
695
696 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
697
698 if (!ReduceSignalUsage) {
699 if (thread->is_VM_thread()) {
700 // Only the VM thread handles BREAK_SIGNAL ...
701 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
702 } else {
703 // ... all other threads block BREAK_SIGNAL
704 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
705 }
706 }
707 }
708
709 // retrieve memory information.
710 // Returns false if something went wrong;
711 // content of pmi undefined in this case.
712 bool os::Aix::get_meminfo(meminfo_t* pmi) {
713
714 assert(pmi, "get_meminfo: invalid parameter");
715
716 memset(pmi, 0, sizeof(meminfo_t));
717
718 if (os::Aix::on_pase()) {
719 // On PASE, use the libo4 porting library.
720
721 unsigned long long virt_total = 0;
722 unsigned long long real_total = 0;
723 unsigned long long real_free = 0;
724 unsigned long long pgsp_total = 0;
725 unsigned long long pgsp_free = 0;
726 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
727 pmi->virt_total = virt_total;
728 pmi->real_total = real_total;
729 pmi->real_free = real_free;
730 pmi->pgsp_total = pgsp_total;
731 pmi->pgsp_free = pgsp_free;
732 return true;
733 }
734 return false;
735
736 } else {
737
738 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
739 // See:
740 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
741 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
742 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
743 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
744
745 perfstat_memory_total_t psmt;
746 memset (&psmt, '\0', sizeof(psmt));
747 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
748 if (rc == -1) {
749 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
750 assert(0, "perfstat_memory_total() failed");
751 return false;
752 }
753
754 assert(rc == 1, "perfstat_memory_total() - weird return code");
755
756 // excerpt from
757 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
758 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
759 // The fields of perfstat_memory_total_t:
760 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
761 // u_longlong_t real_total Total real memory (in 4 KB pages).
762 // u_longlong_t real_free Free real memory (in 4 KB pages).
763 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
764 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
765
766 pmi->virt_total = psmt.virt_total * 4096;
767 pmi->real_total = psmt.real_total * 4096;
768 pmi->real_free = psmt.real_free * 4096;
769 pmi->pgsp_total = psmt.pgsp_total * 4096;
770 pmi->pgsp_free = psmt.pgsp_free * 4096;
771
772 return true;
773
774 }
775 } // end os::Aix::get_meminfo
776
777 //////////////////////////////////////////////////////////////////////////////
778 // create new thread
779
780 // Thread start routine for all newly created threads
781 static void *thread_native_entry(Thread *thread) {
782
783 thread->record_stack_base_and_size();
784
785 const pthread_t pthread_id = ::pthread_self();
786 const tid_t kernel_thread_id = ::thread_self();
787
788 LogTarget(Info, os, thread) lt;
789 if (lt.is_enabled()) {
790 address low_address = thread->stack_end();
791 address high_address = thread->stack_base();
792 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
793 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
794 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
795 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
796 }
797
798 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
799 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
800 // tools hook pthread_create(). In this case, we may run into problems establishing
801 // guard pages on those stacks, because the stacks may reside in memory which is not
802 // protectable (shmated).
803 if (thread->stack_base() > ::sbrk(0)) {
804 log_warning(os, thread)("Thread stack not in data segment.");
805 }
806
807 // Try to randomize the cache line index of hot stack frames.
808 // This helps when threads of the same stack traces evict each other's
809 // cache lines. The threads can be either from the same JVM instance, or
810 // from different JVM instances. The benefit is especially true for
811 // processors with hyperthreading technology.
812
813 static int counter = 0;
814 int pid = os::current_process_id();
815 alloca(((pid ^ counter++) & 7) * 128);
816
817 thread->initialize_thread_current();
818
819 OSThread* osthread = thread->osthread();
820
821 // Thread_id is pthread id.
822 osthread->set_thread_id(pthread_id);
823
824 // .. but keep kernel thread id too for diagnostics
825 osthread->set_kernel_thread_id(kernel_thread_id);
826
827 // Initialize signal mask for this thread.
828 os::Aix::hotspot_sigmask(thread);
829
830 // Initialize floating point control register.
831 os::Aix::init_thread_fpu_state();
832
833 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
834
835 // Call one more level start routine.
836 thread->call_run();
837
838 // Note: at this point the thread object may already have deleted itself.
839 // Prevent dereferencing it from here on out.
840 thread = NULL;
841
842 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
843 os::current_thread_id(), (uintx) kernel_thread_id);
844
845 return 0;
846 }
847
848 bool os::create_thread(Thread* thread, ThreadType thr_type,
849 size_t req_stack_size) {
850
851 assert(thread->osthread() == NULL, "caller responsible");
852
853 // Allocate the OSThread object.
854 OSThread* osthread = new OSThread(NULL, NULL);
855 if (osthread == NULL) {
856 return false;
857 }
858
859 // Set the correct thread state.
860 osthread->set_thread_type(thr_type);
861
862 // Initial state is ALLOCATED but not INITIALIZED
863 osthread->set_state(ALLOCATED);
864
865 thread->set_osthread(osthread);
866
867 // Init thread attributes.
868 pthread_attr_t attr;
869 pthread_attr_init(&attr);
870 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
871
872 // Make sure we run in 1:1 kernel-user-thread mode.
873 if (os::Aix::on_aix()) {
874 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
875 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
876 }
877
878 // Start in suspended state, and in os::thread_start, wake the thread up.
879 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
880
881 // Calculate stack size if it's not specified by caller.
882 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
883
884 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
885 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
886 // This very much looks like a pthread lib error. As a workaround, increase the stack size
887 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
888 if (stack_size < 4096 * K) {
889 stack_size += 64 * K;
890 }
891
892 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
893 // thread size in attr unchanged. If this is the minimal stack size as set
894 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
895 // guard pages might not fit on the tiny stack created.
896 int ret = pthread_attr_setstacksize(&attr, stack_size);
897 if (ret != 0) {
898 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
899 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
900 stack_size / K);
901 thread->set_osthread(NULL);
902 delete osthread;
903 return false;
904 }
905
906 // Save some cycles and a page by disabling OS guard pages where we have our own
907 // VM guard pages (in java threads). For other threads, keep system default guard
908 // pages in place.
909 if (thr_type == java_thread || thr_type == compiler_thread) {
910 ret = pthread_attr_setguardsize(&attr, 0);
911 }
912
913 pthread_t tid = 0;
914 if (ret == 0) {
915 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
916 }
917
918 if (ret == 0) {
919 char buf[64];
920 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
921 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
922 } else {
923 char buf[64];
924 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
925 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
926 // Log some OS information which might explain why creating the thread failed.
927 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
928 LogStream st(Log(os, thread)::info());
929 os::Posix::print_rlimit_info(&st);
930 os::print_memory_info(&st);
931 }
932
933 pthread_attr_destroy(&attr);
934
935 if (ret != 0) {
936 // Need to clean up stuff we've allocated so far.
937 thread->set_osthread(NULL);
938 delete osthread;
939 return false;
940 }
941
942 // OSThread::thread_id is the pthread id.
943 osthread->set_thread_id(tid);
944
945 return true;
946 }
947
948 /////////////////////////////////////////////////////////////////////////////
949 // attach existing thread
950
951 // bootstrap the main thread
952 bool os::create_main_thread(JavaThread* thread) {
953 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
954 return create_attached_thread(thread);
955 }
956
957 bool os::create_attached_thread(JavaThread* thread) {
958 #ifdef ASSERT
959 thread->verify_not_published();
960 #endif
961
962 // Allocate the OSThread object
963 OSThread* osthread = new OSThread(NULL, NULL);
964
965 if (osthread == NULL) {
966 return false;
967 }
968
969 const pthread_t pthread_id = ::pthread_self();
970 const tid_t kernel_thread_id = ::thread_self();
971
972 // OSThread::thread_id is the pthread id.
973 osthread->set_thread_id(pthread_id);
974
975 // .. but keep kernel thread id too for diagnostics
976 osthread->set_kernel_thread_id(kernel_thread_id);
977
978 // initialize floating point control register
979 os::Aix::init_thread_fpu_state();
980
981 // Initial thread state is RUNNABLE
982 osthread->set_state(RUNNABLE);
983
984 thread->set_osthread(osthread);
985
986 if (UseNUMA) {
987 int lgrp_id = os::numa_get_group_id();
988 if (lgrp_id != -1) {
989 thread->set_lgrp_id(lgrp_id);
990 }
991 }
992
993 // initialize signal mask for this thread
994 // and save the caller's signal mask
995 os::Aix::hotspot_sigmask(thread);
996
997 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
998 os::current_thread_id(), (uintx) kernel_thread_id);
999
1000 return true;
1001 }
1002
1003 void os::pd_start_thread(Thread* thread) {
1004 int status = pthread_continue_np(thread->osthread()->pthread_id());
1005 assert(status == 0, "thr_continue failed");
1006 }
1007
1008 // Free OS resources related to the OSThread
1009 void os::free_thread(OSThread* osthread) {
1010 assert(osthread != NULL, "osthread not set");
1011
1012 // We are told to free resources of the argument thread,
1013 // but we can only really operate on the current thread.
1014 assert(Thread::current()->osthread() == osthread,
1015 "os::free_thread but not current thread");
1016
1017 // Restore caller's signal mask
1018 sigset_t sigmask = osthread->caller_sigmask();
1019 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1020
1021 delete osthread;
1022 }
1023
1024 ////////////////////////////////////////////////////////////////////////////////
1025 // time support
1026
1027 // Time since start-up in seconds to a fine granularity.
1028 // Used by VMSelfDestructTimer and the MemProfiler.
1029 double os::elapsedTime() {
1030 return (double)(os::elapsed_counter()) * 0.000001;
1031 }
1032
1033 jlong os::elapsed_counter() {
1034 timeval time;
1035 int status = gettimeofday(&time, NULL);
1036 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1037 }
1038
1039 jlong os::elapsed_frequency() {
1040 return (1000 * 1000);
1041 }
1042
1043 bool os::supports_vtime() { return true; }
1044 bool os::enable_vtime() { return false; }
1045 bool os::vtime_enabled() { return false; }
1046
1047 double os::elapsedVTime() {
1048 struct rusage usage;
1049 int retval = getrusage(RUSAGE_THREAD, &usage);
1050 if (retval == 0) {
1051 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1052 } else {
1053 // better than nothing, but not much
1054 return elapsedTime();
1055 }
1056 }
1057
1058 jlong os::javaTimeMillis() {
1059 timeval time;
1060 int status = gettimeofday(&time, NULL);
1061 assert(status != -1, "aix error at gettimeofday()");
1062 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1063 }
1064
1065 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1066 timeval time;
1067 int status = gettimeofday(&time, NULL);
1068 assert(status != -1, "aix error at gettimeofday()");
1069 seconds = jlong(time.tv_sec);
1070 nanos = jlong(time.tv_usec) * 1000;
1071 }
1072
1073 // We use mread_real_time here.
1074 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1075 // it has to be converted to real time. AIX documentations suggests to do
1076 // this unconditionally, so we do it.
1077 //
1078 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1079 //
1080 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1081 // conversion is necessary. However, mread_real_time will not return
1082 // monotonic results but merely matches read_real_time. So we need a tweak
1083 // to ensure monotonic results.
1084 //
1085 // For PASE no public documentation exists, just word by IBM
1086 jlong os::javaTimeNanos() {
1087 timebasestruct_t time;
1088 int rc = mread_real_time(&time, TIMEBASE_SZ);
1089 if (os::Aix::on_pase()) {
1090 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1091 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1092 jlong prev = max_real_time;
1093 if (now <= prev) {
1094 return prev; // same or retrograde time;
1095 }
1096 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1097 assert(obsv >= prev, "invariant"); // Monotonicity
1098 // If the CAS succeeded then we're done and return "now".
1099 // If the CAS failed and the observed value "obsv" is >= now then
1100 // we should return "obsv". If the CAS failed and now > obsv > prv then
1101 // some other thread raced this thread and installed a new value, in which case
1102 // we could either (a) retry the entire operation, (b) retry trying to install now
1103 // or (c) just return obsv. We use (c). No loop is required although in some cases
1104 // we might discard a higher "now" value in deference to a slightly lower but freshly
1105 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1106 // to (a) or (b) -- and greatly reduces coherence traffic.
1107 // We might also condition (c) on the magnitude of the delta between obsv and now.
1108 // Avoiding excessive CAS operations to hot RW locations is critical.
1109 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1110 return (prev == obsv) ? now : obsv;
1111 } else {
1112 if (rc != RTC_POWER) {
1113 rc = time_base_to_time(&time, TIMEBASE_SZ);
1114 assert(rc != -1, "error calling time_base_to_time()");
1115 }
1116 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1117 }
1118 }
1119
1120 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1121 info_ptr->max_value = ALL_64_BITS;
1122 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1123 info_ptr->may_skip_backward = false;
1124 info_ptr->may_skip_forward = false;
1125 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1126 }
1127
1128 // Return the real, user, and system times in seconds from an
1129 // arbitrary fixed point in the past.
1130 bool os::getTimesSecs(double* process_real_time,
1131 double* process_user_time,
1132 double* process_system_time) {
1133 struct tms ticks;
1134 clock_t real_ticks = times(&ticks);
1135
1136 if (real_ticks == (clock_t) (-1)) {
1137 return false;
1138 } else {
1139 double ticks_per_second = (double) clock_tics_per_sec;
1140 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1141 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1142 *process_real_time = ((double) real_ticks) / ticks_per_second;
1143
1144 return true;
1145 }
1146 }
1147
1148 char * os::local_time_string(char *buf, size_t buflen) {
1149 struct tm t;
1150 time_t long_time;
1151 time(&long_time);
1152 localtime_r(&long_time, &t);
1153 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1154 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1155 t.tm_hour, t.tm_min, t.tm_sec);
1156 return buf;
1157 }
1158
1159 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1160 return localtime_r(clock, res);
1161 }
1162
1163 ////////////////////////////////////////////////////////////////////////////////
1164 // runtime exit support
1165
1166 // Note: os::shutdown() might be called very early during initialization, or
1167 // called from signal handler. Before adding something to os::shutdown(), make
1168 // sure it is async-safe and can handle partially initialized VM.
1169 void os::shutdown() {
1170
1171 // allow PerfMemory to attempt cleanup of any persistent resources
1172 perfMemory_exit();
1173
1174 // needs to remove object in file system
1175 AttachListener::abort();
1176
1177 // flush buffered output, finish log files
1178 ostream_abort();
1179
1180 // Check for abort hook
1181 abort_hook_t abort_hook = Arguments::abort_hook();
1182 if (abort_hook != NULL) {
1183 abort_hook();
1184 }
1185 }
1186
1187 // Note: os::abort() might be called very early during initialization, or
1188 // called from signal handler. Before adding something to os::abort(), make
1189 // sure it is async-safe and can handle partially initialized VM.
1190 void os::abort(bool dump_core, void* siginfo, const void* context) {
1191 os::shutdown();
1192 if (dump_core) {
1193 #ifndef PRODUCT
1194 fdStream out(defaultStream::output_fd());
1195 out.print_raw("Current thread is ");
1196 char buf[16];
1197 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1198 out.print_raw_cr(buf);
1199 out.print_raw_cr("Dumping core ...");
1200 #endif
1201 ::abort(); // dump core
1202 }
1203
1204 ::exit(1);
1205 }
1206
1207 // Die immediately, no exit hook, no abort hook, no cleanup.
1208 // Dump a core file, if possible, for debugging.
1209 void os::die() {
1210 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1211 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1212 // and don't take the time to generate a core file.
1213 os::signal_raise(SIGKILL);
1214 } else {
1215 ::abort();
1216 }
1217 }
1218
1219 intx os::current_thread_id() {
1220 return (intx)pthread_self();
1221 }
1222
1223 int os::current_process_id() {
1224 return getpid();
1225 }
1226
1227 // DLL functions
1228
1229 const char* os::dll_file_extension() { return ".so"; }
1230
1231 // This must be hard coded because it's the system's temporary
1232 // directory not the java application's temp directory, ala java.io.tmpdir.
1233 const char* os::get_temp_directory() { return "/tmp"; }
1234
1235 // Check if addr is inside libjvm.so.
1236 bool os::address_is_in_vm(address addr) {
1237
1238 // Input could be a real pc or a function pointer literal. The latter
1239 // would be a function descriptor residing in the data segment of a module.
1240 loaded_module_t lm;
1241 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1242 return lm.is_in_vm;
1243 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1244 return lm.is_in_vm;
1245 } else {
1246 return false;
1247 }
1248
1249 }
1250
1251 // Resolve an AIX function descriptor literal to a code pointer.
1252 // If the input is a valid code pointer to a text segment of a loaded module,
1253 // it is returned unchanged.
1254 // If the input is a valid AIX function descriptor, it is resolved to the
1255 // code entry point.
1256 // If the input is neither a valid function descriptor nor a valid code pointer,
1257 // NULL is returned.
1258 static address resolve_function_descriptor_to_code_pointer(address p) {
1259
1260 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1261 // It is a real code pointer.
1262 return p;
1263 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1264 // Pointer to data segment, potential function descriptor.
1265 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1266 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1267 // It is a function descriptor.
1268 return code_entry;
1269 }
1270 }
1271
1272 return NULL;
1273 }
1274
1275 bool os::dll_address_to_function_name(address addr, char *buf,
1276 int buflen, int *offset,
1277 bool demangle) {
1278 if (offset) {
1279 *offset = -1;
1280 }
1281 // Buf is not optional, but offset is optional.
1282 assert(buf != NULL, "sanity check");
1283 buf[0] = '\0';
1284
1285 // Resolve function ptr literals first.
1286 addr = resolve_function_descriptor_to_code_pointer(addr);
1287 if (!addr) {
1288 return false;
1289 }
1290
1291 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1292 }
1293
1294 bool os::dll_address_to_library_name(address addr, char* buf,
1295 int buflen, int* offset) {
1296 if (offset) {
1297 *offset = -1;
1298 }
1299 // Buf is not optional, but offset is optional.
1300 assert(buf != NULL, "sanity check");
1301 buf[0] = '\0';
1302
1303 // Resolve function ptr literals first.
1304 addr = resolve_function_descriptor_to_code_pointer(addr);
1305 if (!addr) {
1306 return false;
1307 }
1308
1309 return AixSymbols::get_module_name(addr, buf, buflen);
1310 }
1311
1312 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1313 // for the same architecture as Hotspot is running on.
1314 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1315
1316 if (ebuf && ebuflen > 0) {
1317 ebuf[0] = '\0';
1318 ebuf[ebuflen - 1] = '\0';
1319 }
1320
1321 if (!filename || strlen(filename) == 0) {
1322 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1323 return NULL;
1324 }
1325
1326 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1327 void * result= ::dlopen(filename, RTLD_LAZY);
1328 if (result != NULL) {
1329 Events::log(NULL, "Loaded shared library %s", filename);
1330 // Reload dll cache. Don't do this in signal handling.
1331 LoadedLibraries::reload();
1332 return result;
1333 } else {
1334 // error analysis when dlopen fails
1335 const char* error_report = ::dlerror();
1336 if (error_report == NULL) {
1337 error_report = "dlerror returned no error description";
1338 }
1339 if (ebuf != NULL && ebuflen > 0) {
1340 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1341 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1342 }
1343 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1344 }
1345 return NULL;
1346 }
1347
1348 void* os::dll_lookup(void* handle, const char* name) {
1349 void* res = dlsym(handle, name);
1350 return res;
1351 }
1352
1353 void* os::get_default_process_handle() {
1354 return (void*)::dlopen(NULL, RTLD_LAZY);
1355 }
1356
1357 void os::print_dll_info(outputStream *st) {
1358 st->print_cr("Dynamic libraries:");
1359 LoadedLibraries::print(st);
1360 }
1361
1362 void os::get_summary_os_info(char* buf, size_t buflen) {
1363 // There might be something more readable than uname results for AIX.
1364 struct utsname name;
1365 uname(&name);
1366 snprintf(buf, buflen, "%s %s", name.release, name.version);
1367 }
1368
1369 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1370 // Not yet implemented.
1371 return 0;
1372 }
1373
1374 void os::print_os_info_brief(outputStream* st) {
1375 uint32_t ver = os::Aix::os_version();
1376 st->print_cr("AIX kernel version %u.%u.%u.%u",
1377 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1378
1379 os::Posix::print_uname_info(st);
1380
1381 // Linux uses print_libversion_info(st); here.
1382 }
1383
1384 void os::print_os_info(outputStream* st) {
1385 st->print("OS:");
1386
1387 st->print("uname:");
1388 struct utsname name;
1389 uname(&name);
1390 st->print(name.sysname); st->print(" ");
1391 st->print(name.nodename); st->print(" ");
1392 st->print(name.release); st->print(" ");
1393 st->print(name.version); st->print(" ");
1394 st->print(name.machine);
1395 st->cr();
1396
1397 uint32_t ver = os::Aix::os_version();
1398 st->print_cr("AIX kernel version %u.%u.%u.%u",
1399 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1400
1401 os::Posix::print_rlimit_info(st);
1402
1403 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process.
1404 long tmax = sysconf(_SC_THREAD_THREADS_MAX);
1405 st->print_cr("maximum #threads within a process:%ld", tmax);
1406
1407 // load average
1408 st->print("load average:");
1409 double loadavg[3] = {-1.L, -1.L, -1.L};
1410 os::loadavg(loadavg, 3);
1411 st->print_cr("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1412
1413 // print wpar info
1414 libperfstat::wparinfo_t wi;
1415 if (libperfstat::get_wparinfo(&wi)) {
1416 st->print_cr("wpar info");
1417 st->print_cr("name: %s", wi.name);
1418 st->print_cr("id: %d", wi.wpar_id);
1419 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1420 }
1421
1422 VM_Version::print_platform_virtualization_info(st);
1423 }
1424
1425 void os::print_memory_info(outputStream* st) {
1426
1427 st->print_cr("Memory:");
1428
1429 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1430 describe_pagesize(g_multipage_support.pagesize));
1431 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1432 describe_pagesize(g_multipage_support.datapsize));
1433 st->print_cr(" Text page size: %s",
1434 describe_pagesize(g_multipage_support.textpsize));
1435 st->print_cr(" Thread stack page size (pthread): %s",
1436 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1437 st->print_cr(" Default shared memory page size: %s",
1438 describe_pagesize(g_multipage_support.shmpsize));
1439 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1440 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1441 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1442 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1443 st->print_cr(" Multipage error: %d",
1444 g_multipage_support.error);
1445 st->cr();
1446 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1447
1448 // print out LDR_CNTRL because it affects the default page sizes
1449 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1450 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1451
1452 // Print out EXTSHM because it is an unsupported setting.
1453 const char* const extshm = ::getenv("EXTSHM");
1454 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1455 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1456 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1457 }
1458
1459 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1460 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1461 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1462 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1463 st->cr();
1464
1465 os::Aix::meminfo_t mi;
1466 if (os::Aix::get_meminfo(&mi)) {
1467 if (os::Aix::on_aix()) {
1468 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1469 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1470 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1471 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1472 } else {
1473 // PASE - Numbers are result of QWCRSSTS; they mean:
1474 // real_total: Sum of all system pools
1475 // real_free: always 0
1476 // pgsp_total: we take the size of the system ASP
1477 // pgsp_free: size of system ASP times percentage of system ASP unused
1478 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1479 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1480 st->print_cr("%% system asp used : %.2f",
1481 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1482 }
1483 }
1484 st->cr();
1485
1486 // Print program break.
1487 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1488 address brk_now = (address)::sbrk(0);
1489 if (brk_now != (address)-1) {
1490 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1491 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1492 }
1493 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1494 st->cr();
1495
1496 // Print segments allocated with os::reserve_memory.
1497 st->print_cr("internal virtual memory regions used by vm:");
1498 vmembk_print_on(st);
1499 }
1500
1501 // Get a string for the cpuinfo that is a summary of the cpu type
1502 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1503 // read _system_configuration.version
1504 switch (_system_configuration.version) {
1505 case PV_8:
1506 strncpy(buf, "Power PC 8", buflen);
1507 break;
1508 case PV_7:
1509 strncpy(buf, "Power PC 7", buflen);
1510 break;
1511 case PV_6_1:
1512 strncpy(buf, "Power PC 6 DD1.x", buflen);
1513 break;
1514 case PV_6:
1515 strncpy(buf, "Power PC 6", buflen);
1516 break;
1517 case PV_5:
1518 strncpy(buf, "Power PC 5", buflen);
1519 break;
1520 case PV_5_2:
1521 strncpy(buf, "Power PC 5_2", buflen);
1522 break;
1523 case PV_5_3:
1524 strncpy(buf, "Power PC 5_3", buflen);
1525 break;
1526 case PV_5_Compat:
1527 strncpy(buf, "PV_5_Compat", buflen);
1528 break;
1529 case PV_6_Compat:
1530 strncpy(buf, "PV_6_Compat", buflen);
1531 break;
1532 case PV_7_Compat:
1533 strncpy(buf, "PV_7_Compat", buflen);
1534 break;
1535 case PV_8_Compat:
1536 strncpy(buf, "PV_8_Compat", buflen);
1537 break;
1538 default:
1539 strncpy(buf, "unknown", buflen);
1540 }
1541 }
1542
1543 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1544 // Nothing to do beyond of what os::print_cpu_info() does.
1545 }
1546
1547 static void print_signal_handler(outputStream* st, int sig,
1548 char* buf, size_t buflen);
1549
1550 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1551 st->print_cr("Signal Handlers:");
1552 print_signal_handler(st, SIGSEGV, buf, buflen);
1553 print_signal_handler(st, SIGBUS , buf, buflen);
1554 print_signal_handler(st, SIGFPE , buf, buflen);
1555 print_signal_handler(st, SIGPIPE, buf, buflen);
1556 print_signal_handler(st, SIGXFSZ, buf, buflen);
1557 print_signal_handler(st, SIGILL , buf, buflen);
1558 print_signal_handler(st, SR_signum, buf, buflen);
1559 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1560 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1561 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1562 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1563 print_signal_handler(st, SIGTRAP, buf, buflen);
1564 // We also want to know if someone else adds a SIGDANGER handler because
1565 // that will interfere with OOM killling.
1566 print_signal_handler(st, SIGDANGER, buf, buflen);
1567 }
1568
1569 static char saved_jvm_path[MAXPATHLEN] = {0};
1570
1571 // Find the full path to the current module, libjvm.so.
1572 void os::jvm_path(char *buf, jint buflen) {
1573 // Error checking.
1574 if (buflen < MAXPATHLEN) {
1575 assert(false, "must use a large-enough buffer");
1576 buf[0] = '\0';
1577 return;
1578 }
1579 // Lazy resolve the path to current module.
1580 if (saved_jvm_path[0] != 0) {
1581 strcpy(buf, saved_jvm_path);
1582 return;
1583 }
1584
1585 Dl_info dlinfo;
1586 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1587 assert(ret != 0, "cannot locate libjvm");
1588 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1589 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1590
1591 if (Arguments::sun_java_launcher_is_altjvm()) {
1592 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1593 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1594 // If "/jre/lib/" appears at the right place in the string, then
1595 // assume we are installed in a JDK and we're done. Otherwise, check
1596 // for a JAVA_HOME environment variable and fix up the path so it
1597 // looks like libjvm.so is installed there (append a fake suffix
1598 // hotspot/libjvm.so).
1599 const char *p = buf + strlen(buf) - 1;
1600 for (int count = 0; p > buf && count < 4; ++count) {
1601 for (--p; p > buf && *p != '/'; --p)
1602 /* empty */ ;
1603 }
1604
1605 if (strncmp(p, "/jre/lib/", 9) != 0) {
1606 // Look for JAVA_HOME in the environment.
1607 char* java_home_var = ::getenv("JAVA_HOME");
1608 if (java_home_var != NULL && java_home_var[0] != 0) {
1609 char* jrelib_p;
1610 int len;
1611
1612 // Check the current module name "libjvm.so".
1613 p = strrchr(buf, '/');
1614 if (p == NULL) {
1615 return;
1616 }
1617 assert(strstr(p, "/libjvm") == p, "invalid library name");
1618
1619 rp = os::Posix::realpath(java_home_var, buf, buflen);
1620 if (rp == NULL) {
1621 return;
1622 }
1623
1624 // determine if this is a legacy image or modules image
1625 // modules image doesn't have "jre" subdirectory
1626 len = strlen(buf);
1627 assert(len < buflen, "Ran out of buffer room");
1628 jrelib_p = buf + len;
1629 snprintf(jrelib_p, buflen-len, "/jre/lib");
1630 if (0 != access(buf, F_OK)) {
1631 snprintf(jrelib_p, buflen-len, "/lib");
1632 }
1633
1634 if (0 == access(buf, F_OK)) {
1635 // Use current module name "libjvm.so"
1636 len = strlen(buf);
1637 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1638 } else {
1639 // Go back to path of .so
1640 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1641 if (rp == NULL) {
1642 return;
1643 }
1644 }
1645 }
1646 }
1647 }
1648
1649 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1650 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1651 }
1652
1653 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1654 // no prefix required, not even "_"
1655 }
1656
1657 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1658 // no suffix required
1659 }
1660
1661 ////////////////////////////////////////////////////////////////////////////////
1662 // sun.misc.Signal support
1663
1664 static volatile jint sigint_count = 0;
1665
1666 static void
1667 UserHandler(int sig, void *siginfo, void *context) {
1668 // 4511530 - sem_post is serialized and handled by the manager thread. When
1669 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1670 // don't want to flood the manager thread with sem_post requests.
1671 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1672 return;
1673
1674 // Ctrl-C is pressed during error reporting, likely because the error
1675 // handler fails to abort. Let VM die immediately.
1676 if (sig == SIGINT && VMError::is_error_reported()) {
1677 os::die();
1678 }
1679
1680 os::signal_notify(sig);
1681 }
1682
1683 void* os::user_handler() {
1684 return CAST_FROM_FN_PTR(void*, UserHandler);
1685 }
1686
1687 extern "C" {
1688 typedef void (*sa_handler_t)(int);
1689 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1690 }
1691
1692 void* os::signal(int signal_number, void* handler) {
1693 struct sigaction sigAct, oldSigAct;
1694
1695 sigfillset(&(sigAct.sa_mask));
1696
1697 // Do not block out synchronous signals in the signal handler.
1698 // Blocking synchronous signals only makes sense if you can really
1699 // be sure that those signals won't happen during signal handling,
1700 // when the blocking applies. Normal signal handlers are lean and
1701 // do not cause signals. But our signal handlers tend to be "risky"
1702 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1703 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1704 // by a SIGILL, which was blocked due to the signal mask. The process
1705 // just hung forever. Better to crash from a secondary signal than to hang.
1706 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1707 sigdelset(&(sigAct.sa_mask), SIGBUS);
1708 sigdelset(&(sigAct.sa_mask), SIGILL);
1709 sigdelset(&(sigAct.sa_mask), SIGFPE);
1710 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1711
1712 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1713
1714 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1715
1716 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1717 // -1 means registration failed
1718 return (void *)-1;
1719 }
1720
1721 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1722 }
1723
1724 void os::signal_raise(int signal_number) {
1725 ::raise(signal_number);
1726 }
1727
1728 //
1729 // The following code is moved from os.cpp for making this
1730 // code platform specific, which it is by its very nature.
1731 //
1732
1733 // Will be modified when max signal is changed to be dynamic
1734 int os::sigexitnum_pd() {
1735 return NSIG;
1736 }
1737
1738 // a counter for each possible signal value
1739 static volatile jint pending_signals[NSIG+1] = { 0 };
1740
1741 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1742 // On AIX, we use sem_init(), sem_post(), sem_wait()
1743 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1744 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1745 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1746 // on AIX, msem_..() calls are suspected of causing problems.
1747 static sem_t sig_sem;
1748 static msemaphore* p_sig_msem = 0;
1749
1750 static void local_sem_init() {
1751 if (os::Aix::on_aix()) {
1752 int rc = ::sem_init(&sig_sem, 0, 0);
1753 guarantee(rc != -1, "sem_init failed");
1754 } else {
1755 // Memory semaphores must live in shared mem.
1756 guarantee0(p_sig_msem == NULL);
1757 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1758 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1759 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1760 }
1761 }
1762
1763 static void local_sem_post() {
1764 static bool warn_only_once = false;
1765 if (os::Aix::on_aix()) {
1766 int rc = ::sem_post(&sig_sem);
1767 if (rc == -1 && !warn_only_once) {
1768 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1769 warn_only_once = true;
1770 }
1771 } else {
1772 guarantee0(p_sig_msem != NULL);
1773 int rc = ::msem_unlock(p_sig_msem, 0);
1774 if (rc == -1 && !warn_only_once) {
1775 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1776 warn_only_once = true;
1777 }
1778 }
1779 }
1780
1781 static void local_sem_wait() {
1782 static bool warn_only_once = false;
1783 if (os::Aix::on_aix()) {
1784 int rc = ::sem_wait(&sig_sem);
1785 if (rc == -1 && !warn_only_once) {
1786 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1787 warn_only_once = true;
1788 }
1789 } else {
1790 guarantee0(p_sig_msem != NULL); // must init before use
1791 int rc = ::msem_lock(p_sig_msem, 0);
1792 if (rc == -1 && !warn_only_once) {
1793 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1794 warn_only_once = true;
1795 }
1796 }
1797 }
1798
1799 static void jdk_misc_signal_init() {
1800 // Initialize signal structures
1801 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1802
1803 // Initialize signal semaphore
1804 local_sem_init();
1805 }
1806
1807 void os::signal_notify(int sig) {
1808 Atomic::inc(&pending_signals[sig]);
1809 local_sem_post();
1810 }
1811
1812 static int check_pending_signals() {
1813 Atomic::store(0, &sigint_count);
1814 for (;;) {
1815 for (int i = 0; i < NSIG + 1; i++) {
1816 jint n = pending_signals[i];
1817 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1818 return i;
1819 }
1820 }
1821 JavaThread *thread = JavaThread::current();
1822 ThreadBlockInVM tbivm(thread);
1823
1824 bool threadIsSuspended;
1825 do {
1826 thread->set_suspend_equivalent();
1827 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1828
1829 local_sem_wait();
1830
1831 // were we externally suspended while we were waiting?
1832 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1833 if (threadIsSuspended) {
1834 //
1835 // The semaphore has been incremented, but while we were waiting
1836 // another thread suspended us. We don't want to continue running
1837 // while suspended because that would surprise the thread that
1838 // suspended us.
1839 //
1840
1841 local_sem_post();
1842
1843 thread->java_suspend_self();
1844 }
1845 } while (threadIsSuspended);
1846 }
1847 }
1848
1849 int os::signal_wait() {
1850 return check_pending_signals();
1851 }
1852
1853 ////////////////////////////////////////////////////////////////////////////////
1854 // Virtual Memory
1855
1856 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1857
1858 #define VMEM_MAPPED 1
1859 #define VMEM_SHMATED 2
1860
1861 struct vmembk_t {
1862 int type; // 1 - mmap, 2 - shmat
1863 char* addr;
1864 size_t size; // Real size, may be larger than usersize.
1865 size_t pagesize; // page size of area
1866 vmembk_t* next;
1867
1868 bool contains_addr(char* p) const {
1869 return p >= addr && p < (addr + size);
1870 }
1871
1872 bool contains_range(char* p, size_t s) const {
1873 return contains_addr(p) && contains_addr(p + s - 1);
1874 }
1875
1876 void print_on(outputStream* os) const {
1877 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1878 " bytes, %d %s pages), %s",
1879 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1880 (type == VMEM_SHMATED ? "shmat" : "mmap")
1881 );
1882 }
1883
1884 // Check that range is a sub range of memory block (or equal to memory block);
1885 // also check that range is fully page aligned to the page size if the block.
1886 void assert_is_valid_subrange(char* p, size_t s) const {
1887 if (!contains_range(p, s)) {
1888 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1889 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1890 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size));
1891 guarantee0(false);
1892 }
1893 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1894 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1895 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize);
1896 guarantee0(false);
1897 }
1898 }
1899 };
1900
1901 static struct {
1902 vmembk_t* first;
1903 MiscUtils::CritSect cs;
1904 } vmem;
1905
1906 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1907 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1908 assert0(p);
1909 if (p) {
1910 MiscUtils::AutoCritSect lck(&vmem.cs);
1911 p->addr = addr; p->size = size;
1912 p->pagesize = pagesize;
1913 p->type = type;
1914 p->next = vmem.first;
1915 vmem.first = p;
1916 }
1917 }
1918
1919 static vmembk_t* vmembk_find(char* addr) {
1920 MiscUtils::AutoCritSect lck(&vmem.cs);
1921 for (vmembk_t* p = vmem.first; p; p = p->next) {
1922 if (p->addr <= addr && (p->addr + p->size) > addr) {
1923 return p;
1924 }
1925 }
1926 return NULL;
1927 }
1928
1929 static void vmembk_remove(vmembk_t* p0) {
1930 MiscUtils::AutoCritSect lck(&vmem.cs);
1931 assert0(p0);
1932 assert0(vmem.first); // List should not be empty.
1933 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1934 if (*pp == p0) {
1935 *pp = p0->next;
1936 ::free(p0);
1937 return;
1938 }
1939 }
1940 assert0(false); // Not found?
1941 }
1942
1943 static void vmembk_print_on(outputStream* os) {
1944 MiscUtils::AutoCritSect lck(&vmem.cs);
1945 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1946 vmi->print_on(os);
1947 os->cr();
1948 }
1949 }
1950
1951 // Reserve and attach a section of System V memory.
1952 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1953 // address. Failing that, it will attach the memory anywhere.
1954 // If <requested_addr> is NULL, function will attach the memory anywhere.
1955 //
1956 // <alignment_hint> is being ignored by this function. It is very probable however that the
1957 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1958 // Should this be not enogh, we can put more work into it.
1959 static char* reserve_shmated_memory (
1960 size_t bytes,
1961 char* requested_addr,
1962 size_t alignment_hint) {
1963
1964 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1965 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1966 bytes, p2i(requested_addr), alignment_hint);
1967
1968 // Either give me wish address or wish alignment but not both.
1969 assert0(!(requested_addr != NULL && alignment_hint != 0));
1970
1971 // We must prevent anyone from attaching too close to the
1972 // BRK because that may cause malloc OOM.
1973 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1974 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1975 "Will attach anywhere.", p2i(requested_addr));
1976 // Act like the OS refused to attach there.
1977 requested_addr = NULL;
1978 }
1979
1980 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1981 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1982 if (os::Aix::on_pase_V5R4_or_older()) {
1983 ShouldNotReachHere();
1984 }
1985
1986 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1987 const size_t size = align_up(bytes, 64*K);
1988
1989 // Reserve the shared segment.
1990 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1991 if (shmid == -1) {
1992 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1993 return NULL;
1994 }
1995
1996 // Important note:
1997 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1998 // We must right after attaching it remove it from the system. System V shm segments are global and
1999 // survive the process.
2000 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2001
2002 struct shmid_ds shmbuf;
2003 memset(&shmbuf, 0, sizeof(shmbuf));
2004 shmbuf.shm_pagesize = 64*K;
2005 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2006 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2007 size / (64*K), errno);
2008 // I want to know if this ever happens.
2009 assert(false, "failed to set page size for shmat");
2010 }
2011
2012 // Now attach the shared segment.
2013 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2014 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2015 // were not a segment boundary.
2016 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2017 const int errno_shmat = errno;
2018
2019 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2020 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2021 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2022 assert(false, "failed to remove shared memory segment!");
2023 }
2024
2025 // Handle shmat error. If we failed to attach, just return.
2026 if (addr == (char*)-1) {
2027 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat);
2028 return NULL;
2029 }
2030
2031 // Just for info: query the real page size. In case setting the page size did not
2032 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2033 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2034 if (real_pagesize != shmbuf.shm_pagesize) {
2035 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize);
2036 }
2037
2038 if (addr) {
2039 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2040 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize));
2041 } else {
2042 if (requested_addr != NULL) {
2043 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr));
2044 } else {
2045 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2046 }
2047 }
2048
2049 // book-keeping
2050 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2051 assert0(is_aligned_to(addr, os::vm_page_size()));
2052
2053 return addr;
2054 }
2055
2056 static bool release_shmated_memory(char* addr, size_t size) {
2057
2058 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2059 p2i(addr), p2i(addr + size - 1));
2060
2061 bool rc = false;
2062
2063 // TODO: is there a way to verify shm size without doing bookkeeping?
2064 if (::shmdt(addr) != 0) {
2065 trcVerbose("error (%d).", errno);
2066 } else {
2067 trcVerbose("ok.");
2068 rc = true;
2069 }
2070 return rc;
2071 }
2072
2073 static bool uncommit_shmated_memory(char* addr, size_t size) {
2074 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2075 p2i(addr), p2i(addr + size - 1));
2076
2077 const bool rc = my_disclaim64(addr, size);
2078
2079 if (!rc) {
2080 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size);
2081 return false;
2082 }
2083 return true;
2084 }
2085
2086 //////////////////////////////// mmap-based routines /////////////////////////////////
2087
2088 // Reserve memory via mmap.
2089 // If <requested_addr> is given, an attempt is made to attach at the given address.
2090 // Failing that, memory is allocated at any address.
2091 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2092 // allocate at an address aligned with the given alignment. Failing that, memory
2093 // is aligned anywhere.
2094 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2095 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2096 "alignment_hint " UINTX_FORMAT "...",
2097 bytes, p2i(requested_addr), alignment_hint);
2098
2099 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2100 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2101 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr));
2102 return NULL;
2103 }
2104
2105 // We must prevent anyone from attaching too close to the
2106 // BRK because that may cause malloc OOM.
2107 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2108 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2109 "Will attach anywhere.", p2i(requested_addr));
2110 // Act like the OS refused to attach there.
2111 requested_addr = NULL;
2112 }
2113
2114 // Specify one or the other but not both.
2115 assert0(!(requested_addr != NULL && alignment_hint > 0));
2116
2117 // In 64K mode, we claim the global page size (os::vm_page_size())
2118 // is 64K. This is one of the few points where that illusion may
2119 // break, because mmap() will always return memory aligned to 4K. So
2120 // we must ensure we only ever return memory aligned to 64k.
2121 if (alignment_hint) {
2122 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2123 } else {
2124 alignment_hint = os::vm_page_size();
2125 }
2126
2127 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2128 const size_t size = align_up(bytes, os::vm_page_size());
2129
2130 // alignment: Allocate memory large enough to include an aligned range of the right size and
2131 // cut off the leading and trailing waste pages.
2132 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2133 const size_t extra_size = size + alignment_hint;
2134
2135 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2136 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2137 int flags = MAP_ANONYMOUS | MAP_SHARED;
2138
2139 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2140 // it means if wishaddress is given but MAP_FIXED is not set.
2141 //
2142 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2143 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2144 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2145 // get clobbered.
2146 if (requested_addr != NULL) {
2147 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2148 flags |= MAP_FIXED;
2149 }
2150 }
2151
2152 char* addr = (char*)::mmap(requested_addr, extra_size,
2153 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2154
2155 if (addr == MAP_FAILED) {
2156 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno);
2157 return NULL;
2158 }
2159
2160 // Handle alignment.
2161 char* const addr_aligned = align_up(addr, alignment_hint);
2162 const size_t waste_pre = addr_aligned - addr;
2163 char* const addr_aligned_end = addr_aligned + size;
2164 const size_t waste_post = extra_size - waste_pre - size;
2165 if (waste_pre > 0) {
2166 ::munmap(addr, waste_pre);
2167 }
2168 if (waste_post > 0) {
2169 ::munmap(addr_aligned_end, waste_post);
2170 }
2171 addr = addr_aligned;
2172
2173 if (addr) {
2174 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2175 p2i(addr), p2i(addr + bytes), bytes);
2176 } else {
2177 if (requested_addr != NULL) {
2178 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr));
2179 } else {
2180 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2181 }
2182 }
2183
2184 // bookkeeping
2185 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2186
2187 // Test alignment, see above.
2188 assert0(is_aligned_to(addr, os::vm_page_size()));
2189
2190 return addr;
2191 }
2192
2193 static bool release_mmaped_memory(char* addr, size_t size) {
2194 assert0(is_aligned_to(addr, os::vm_page_size()));
2195 assert0(is_aligned_to(size, os::vm_page_size()));
2196
2197 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2198 p2i(addr), p2i(addr + size - 1));
2199 bool rc = false;
2200
2201 if (::munmap(addr, size) != 0) {
2202 trcVerbose("failed (%d)\n", errno);
2203 rc = false;
2204 } else {
2205 trcVerbose("ok.");
2206 rc = true;
2207 }
2208
2209 return rc;
2210 }
2211
2212 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2213
2214 assert0(is_aligned_to(addr, os::vm_page_size()));
2215 assert0(is_aligned_to(size, os::vm_page_size()));
2216
2217 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2218 p2i(addr), p2i(addr + size - 1));
2219 bool rc = false;
2220
2221 // Uncommit mmap memory with msync MS_INVALIDATE.
2222 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2223 trcVerbose("failed (%d)\n", errno);
2224 rc = false;
2225 } else {
2226 trcVerbose("ok.");
2227 rc = true;
2228 }
2229
2230 return rc;
2231 }
2232
2233 int os::vm_page_size() {
2234 // Seems redundant as all get out.
2235 assert(os::Aix::page_size() != -1, "must call os::init");
2236 return os::Aix::page_size();
2237 }
2238
2239 // Aix allocates memory by pages.
2240 int os::vm_allocation_granularity() {
2241 assert(os::Aix::page_size() != -1, "must call os::init");
2242 return os::Aix::page_size();
2243 }
2244
2245 #ifdef PRODUCT
2246 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2247 int err) {
2248 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2249 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec,
2250 os::errno_name(err), err);
2251 }
2252 #endif
2253
2254 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2255 const char* mesg) {
2256 assert(mesg != NULL, "mesg must be specified");
2257 if (!pd_commit_memory(addr, size, exec)) {
2258 // Add extra info in product mode for vm_exit_out_of_memory():
2259 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2260 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2261 }
2262 }
2263
2264 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2265
2266 assert(is_aligned_to(addr, os::vm_page_size()),
2267 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2268 p2i(addr), os::vm_page_size());
2269 assert(is_aligned_to(size, os::vm_page_size()),
2270 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2271 size, os::vm_page_size());
2272
2273 vmembk_t* const vmi = vmembk_find(addr);
2274 guarantee0(vmi);
2275 vmi->assert_is_valid_subrange(addr, size);
2276
2277 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1));
2278
2279 if (UseExplicitCommit) {
2280 // AIX commits memory on touch. So, touch all pages to be committed.
2281 for (char* p = addr; p < (addr + size); p += 4*K) {
2282 *p = '\0';
2283 }
2284 }
2285
2286 return true;
2287 }
2288
2289 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2290 return pd_commit_memory(addr, size, exec);
2291 }
2292
2293 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2294 size_t alignment_hint, bool exec,
2295 const char* mesg) {
2296 // Alignment_hint is ignored on this OS.
2297 pd_commit_memory_or_exit(addr, size, exec, mesg);
2298 }
2299
2300 bool os::pd_uncommit_memory(char* addr, size_t size) {
2301 assert(is_aligned_to(addr, os::vm_page_size()),
2302 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2303 p2i(addr), os::vm_page_size());
2304 assert(is_aligned_to(size, os::vm_page_size()),
2305 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2306 size, os::vm_page_size());
2307
2308 // Dynamically do different things for mmap/shmat.
2309 const vmembk_t* const vmi = vmembk_find(addr);
2310 guarantee0(vmi);
2311 vmi->assert_is_valid_subrange(addr, size);
2312
2313 if (vmi->type == VMEM_SHMATED) {
2314 return uncommit_shmated_memory(addr, size);
2315 } else {
2316 return uncommit_mmaped_memory(addr, size);
2317 }
2318 }
2319
2320 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2321 // Do not call this; no need to commit stack pages on AIX.
2322 ShouldNotReachHere();
2323 return true;
2324 }
2325
2326 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2327 // Do not call this; no need to commit stack pages on AIX.
2328 ShouldNotReachHere();
2329 return true;
2330 }
2331
2332 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2333 }
2334
2335 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2336 }
2337
2338 void os::numa_make_global(char *addr, size_t bytes) {
2339 }
2340
2341 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2342 }
2343
2344 bool os::numa_topology_changed() {
2345 return false;
2346 }
2347
2348 size_t os::numa_get_groups_num() {
2349 return 1;
2350 }
2351
2352 int os::numa_get_group_id() {
2353 return 0;
2354 }
2355
2356 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2357 if (size > 0) {
2358 ids[0] = 0;
2359 return 1;
2360 }
2361 return 0;
2362 }
2363
2364 bool os::get_page_info(char *start, page_info* info) {
2365 return false;
2366 }
2367
2368 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2369 return end;
2370 }
2371
2372 // Reserves and attaches a shared memory segment.
2373 // Will assert if a wish address is given and could not be obtained.
2374 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2375
2376 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2377 // thereby clobbering old mappings at that place. That is probably
2378 // not intended, never used and almost certainly an error were it
2379 // ever be used this way (to try attaching at a specified address
2380 // without clobbering old mappings an alternate API exists,
2381 // os::attempt_reserve_memory_at()).
2382 // Instead of mimicking the dangerous coding of the other platforms, here I
2383 // just ignore the request address (release) or assert(debug).
2384 assert0(requested_addr == NULL);
2385
2386 // Always round to os::vm_page_size(), which may be larger than 4K.
2387 bytes = align_up(bytes, os::vm_page_size());
2388 const size_t alignment_hint0 =
2389 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2390
2391 // In 4K mode always use mmap.
2392 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2393 if (os::vm_page_size() == 4*K) {
2394 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2395 } else {
2396 if (bytes >= Use64KPagesThreshold) {
2397 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2398 } else {
2399 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2400 }
2401 }
2402 }
2403
2404 bool os::pd_release_memory(char* addr, size_t size) {
2405
2406 // Dynamically do different things for mmap/shmat.
2407 vmembk_t* const vmi = vmembk_find(addr);
2408 guarantee0(vmi);
2409
2410 // Always round to os::vm_page_size(), which may be larger than 4K.
2411 size = align_up(size, os::vm_page_size());
2412 addr = align_up(addr, os::vm_page_size());
2413
2414 bool rc = false;
2415 bool remove_bookkeeping = false;
2416 if (vmi->type == VMEM_SHMATED) {
2417 // For shmatted memory, we do:
2418 // - If user wants to release the whole range, release the memory (shmdt).
2419 // - If user only wants to release a partial range, uncommit (disclaim) that
2420 // range. That way, at least, we do not use memory anymore (bust still page
2421 // table space).
2422 vmi->assert_is_valid_subrange(addr, size);
2423 if (addr == vmi->addr && size == vmi->size) {
2424 rc = release_shmated_memory(addr, size);
2425 remove_bookkeeping = true;
2426 } else {
2427 rc = uncommit_shmated_memory(addr, size);
2428 }
2429 } else {
2430 // User may unmap partial regions but region has to be fully contained.
2431 #ifdef ASSERT
2432 vmi->assert_is_valid_subrange(addr, size);
2433 #endif
2434 rc = release_mmaped_memory(addr, size);
2435 remove_bookkeeping = true;
2436 }
2437
2438 // update bookkeeping
2439 if (rc && remove_bookkeeping) {
2440 vmembk_remove(vmi);
2441 }
2442
2443 return rc;
2444 }
2445
2446 static bool checked_mprotect(char* addr, size_t size, int prot) {
2447
2448 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2449 // not tell me if protection failed when trying to protect an un-protectable range.
2450 //
2451 // This means if the memory was allocated using shmget/shmat, protection wont work
2452 // but mprotect will still return 0:
2453 //
2454 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2455
2456 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2457 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2458
2459 if (!rc) {
2460 const char* const s_errno = os::errno_name(errno);
2461 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2462 return false;
2463 }
2464
2465 // mprotect success check
2466 //
2467 // Mprotect said it changed the protection but can I believe it?
2468 //
2469 // To be sure I need to check the protection afterwards. Try to
2470 // read from protected memory and check whether that causes a segfault.
2471 //
2472 if (!os::Aix::xpg_sus_mode()) {
2473
2474 if (CanUseSafeFetch32()) {
2475
2476 const bool read_protected =
2477 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2478 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2479
2480 if (prot & PROT_READ) {
2481 rc = !read_protected;
2482 } else {
2483 rc = read_protected;
2484 }
2485
2486 if (!rc) {
2487 if (os::Aix::on_pase()) {
2488 // There is an issue on older PASE systems where mprotect() will return success but the
2489 // memory will not be protected.
2490 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2491 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2492 // a stack. It is an OS error.
2493 //
2494 // A valid strategy is just to try again. This usually works. :-/
2495
2496 ::usleep(1000);
2497 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2498 if (::mprotect(addr, size, prot) == 0) {
2499 const bool read_protected_2 =
2500 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2501 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2502 rc = true;
2503 }
2504 }
2505 }
2506 }
2507 }
2508
2509 assert(rc == true, "mprotect failed.");
2510
2511 return rc;
2512 }
2513
2514 // Set protections specified
2515 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2516 unsigned int p = 0;
2517 switch (prot) {
2518 case MEM_PROT_NONE: p = PROT_NONE; break;
2519 case MEM_PROT_READ: p = PROT_READ; break;
2520 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2521 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2522 default:
2523 ShouldNotReachHere();
2524 }
2525 // is_committed is unused.
2526 return checked_mprotect(addr, size, p);
2527 }
2528
2529 bool os::guard_memory(char* addr, size_t size) {
2530 return checked_mprotect(addr, size, PROT_NONE);
2531 }
2532
2533 bool os::unguard_memory(char* addr, size_t size) {
2534 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2535 }
2536
2537 // Large page support
2538
2539 static size_t _large_page_size = 0;
2540
2541 // Enable large page support if OS allows that.
2542 void os::large_page_init() {
2543 return; // Nothing to do. See query_multipage_support and friends.
2544 }
2545
2546 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2547 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2548 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2549 // so this is not needed.
2550 assert(false, "should not be called on AIX");
2551 return NULL;
2552 }
2553
2554 bool os::release_memory_special(char* base, size_t bytes) {
2555 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2556 Unimplemented();
2557 return false;
2558 }
2559
2560 size_t os::large_page_size() {
2561 return _large_page_size;
2562 }
2563
2564 bool os::can_commit_large_page_memory() {
2565 // Does not matter, we do not support huge pages.
2566 return false;
2567 }
2568
2569 bool os::can_execute_large_page_memory() {
2570 // Does not matter, we do not support huge pages.
2571 return false;
2572 }
2573
2574 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2575 assert(file_desc >= 0, "file_desc is not valid");
2576 char* result = NULL;
2577
2578 // Always round to os::vm_page_size(), which may be larger than 4K.
2579 bytes = align_up(bytes, os::vm_page_size());
2580 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2581
2582 if (result != NULL) {
2583 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2584 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2585 }
2586 }
2587 return result;
2588 }
2589
2590 // Reserve memory at an arbitrary address, only if that area is
2591 // available (and not reserved for something else).
2592 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2593 char* addr = NULL;
2594
2595 // Always round to os::vm_page_size(), which may be larger than 4K.
2596 bytes = align_up(bytes, os::vm_page_size());
2597
2598 // In 4K mode always use mmap.
2599 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2600 if (os::vm_page_size() == 4*K) {
2601 return reserve_mmaped_memory(bytes, requested_addr, 0);
2602 } else {
2603 if (bytes >= Use64KPagesThreshold) {
2604 return reserve_shmated_memory(bytes, requested_addr, 0);
2605 } else {
2606 return reserve_mmaped_memory(bytes, requested_addr, 0);
2607 }
2608 }
2609
2610 return addr;
2611 }
2612
2613 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2614 void os::infinite_sleep() {
2615 while (true) { // sleep forever ...
2616 ::sleep(100); // ... 100 seconds at a time
2617 }
2618 }
2619
2620 // Used to convert frequent JVM_Yield() to nops
2621 bool os::dont_yield() {
2622 return DontYieldALot;
2623 }
2624
2625 void os::naked_yield() {
2626 sched_yield();
2627 }
2628
2629 ////////////////////////////////////////////////////////////////////////////////
2630 // thread priority support
2631
2632 // From AIX manpage to pthread_setschedparam
2633 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2634 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2635 //
2636 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2637 // range from 40 to 80, where 40 is the least favored priority and 80
2638 // is the most favored."
2639 //
2640 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2641 // scheduling there; however, this still leaves iSeries.)
2642 //
2643 // We use the same values for AIX and PASE.
2644 int os::java_to_os_priority[CriticalPriority + 1] = {
2645 54, // 0 Entry should never be used
2646
2647 55, // 1 MinPriority
2648 55, // 2
2649 56, // 3
2650
2651 56, // 4
2652 57, // 5 NormPriority
2653 57, // 6
2654
2655 58, // 7
2656 58, // 8
2657 59, // 9 NearMaxPriority
2658
2659 60, // 10 MaxPriority
2660
2661 60 // 11 CriticalPriority
2662 };
2663
2664 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2665 if (!UseThreadPriorities) return OS_OK;
2666 pthread_t thr = thread->osthread()->pthread_id();
2667 int policy = SCHED_OTHER;
2668 struct sched_param param;
2669 param.sched_priority = newpri;
2670 int ret = pthread_setschedparam(thr, policy, ¶m);
2671
2672 if (ret != 0) {
2673 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2674 (int)thr, newpri, ret, os::errno_name(ret));
2675 }
2676 return (ret == 0) ? OS_OK : OS_ERR;
2677 }
2678
2679 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2680 if (!UseThreadPriorities) {
2681 *priority_ptr = java_to_os_priority[NormPriority];
2682 return OS_OK;
2683 }
2684 pthread_t thr = thread->osthread()->pthread_id();
2685 int policy = SCHED_OTHER;
2686 struct sched_param param;
2687 int ret = pthread_getschedparam(thr, &policy, ¶m);
2688 *priority_ptr = param.sched_priority;
2689
2690 return (ret == 0) ? OS_OK : OS_ERR;
2691 }
2692
2693 ////////////////////////////////////////////////////////////////////////////////
2694 // suspend/resume support
2695
2696 // The low-level signal-based suspend/resume support is a remnant from the
2697 // old VM-suspension that used to be for java-suspension, safepoints etc,
2698 // within hotspot. Currently used by JFR's OSThreadSampler
2699 //
2700 // The remaining code is greatly simplified from the more general suspension
2701 // code that used to be used.
2702 //
2703 // The protocol is quite simple:
2704 // - suspend:
2705 // - sends a signal to the target thread
2706 // - polls the suspend state of the osthread using a yield loop
2707 // - target thread signal handler (SR_handler) sets suspend state
2708 // and blocks in sigsuspend until continued
2709 // - resume:
2710 // - sets target osthread state to continue
2711 // - sends signal to end the sigsuspend loop in the SR_handler
2712 //
2713 // Note that the SR_lock plays no role in this suspend/resume protocol,
2714 // but is checked for NULL in SR_handler as a thread termination indicator.
2715 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2716 //
2717 // Note that resume_clear_context() and suspend_save_context() are needed
2718 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2719 // which in part is used by:
2720 // - Forte Analyzer: AsyncGetCallTrace()
2721 // - StackBanging: get_frame_at_stack_banging_point()
2722
2723 static void resume_clear_context(OSThread *osthread) {
2724 osthread->set_ucontext(NULL);
2725 osthread->set_siginfo(NULL);
2726 }
2727
2728 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2729 osthread->set_ucontext(context);
2730 osthread->set_siginfo(siginfo);
2731 }
2732
2733 //
2734 // Handler function invoked when a thread's execution is suspended or
2735 // resumed. We have to be careful that only async-safe functions are
2736 // called here (Note: most pthread functions are not async safe and
2737 // should be avoided.)
2738 //
2739 // Note: sigwait() is a more natural fit than sigsuspend() from an
2740 // interface point of view, but sigwait() prevents the signal hander
2741 // from being run. libpthread would get very confused by not having
2742 // its signal handlers run and prevents sigwait()'s use with the
2743 // mutex granting granting signal.
2744 //
2745 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2746 //
2747 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2748 // Save and restore errno to avoid confusing native code with EINTR
2749 // after sigsuspend.
2750 int old_errno = errno;
2751
2752 Thread* thread = Thread::current_or_null_safe();
2753 assert(thread != NULL, "Missing current thread in SR_handler");
2754
2755 // On some systems we have seen signal delivery get "stuck" until the signal
2756 // mask is changed as part of thread termination. Check that the current thread
2757 // has not already terminated (via SR_lock()) - else the following assertion
2758 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2759 // destructor has completed.
2760
2761 if (thread->SR_lock() == NULL) {
2762 return;
2763 }
2764
2765 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2766
2767 OSThread* osthread = thread->osthread();
2768
2769 os::SuspendResume::State current = osthread->sr.state();
2770 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2771 suspend_save_context(osthread, siginfo, context);
2772
2773 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2774 os::SuspendResume::State state = osthread->sr.suspended();
2775 if (state == os::SuspendResume::SR_SUSPENDED) {
2776 sigset_t suspend_set; // signals for sigsuspend()
2777
2778 // get current set of blocked signals and unblock resume signal
2779 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2780 sigdelset(&suspend_set, SR_signum);
2781
2782 // wait here until we are resumed
2783 while (1) {
2784 sigsuspend(&suspend_set);
2785
2786 os::SuspendResume::State result = osthread->sr.running();
2787 if (result == os::SuspendResume::SR_RUNNING) {
2788 break;
2789 }
2790 }
2791
2792 } else if (state == os::SuspendResume::SR_RUNNING) {
2793 // request was cancelled, continue
2794 } else {
2795 ShouldNotReachHere();
2796 }
2797
2798 resume_clear_context(osthread);
2799 } else if (current == os::SuspendResume::SR_RUNNING) {
2800 // request was cancelled, continue
2801 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2802 // ignore
2803 } else {
2804 ShouldNotReachHere();
2805 }
2806
2807 errno = old_errno;
2808 }
2809
2810 static int SR_initialize() {
2811 struct sigaction act;
2812 char *s;
2813 // Get signal number to use for suspend/resume
2814 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2815 int sig = ::strtol(s, 0, 10);
2816 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2817 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2818 SR_signum = sig;
2819 } else {
2820 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2821 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2822 }
2823 }
2824
2825 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2826 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2827
2828 sigemptyset(&SR_sigset);
2829 sigaddset(&SR_sigset, SR_signum);
2830
2831 // Set up signal handler for suspend/resume.
2832 act.sa_flags = SA_RESTART|SA_SIGINFO;
2833 act.sa_handler = (void (*)(int)) SR_handler;
2834
2835 // SR_signum is blocked by default.
2836 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2837
2838 if (sigaction(SR_signum, &act, 0) == -1) {
2839 return -1;
2840 }
2841
2842 // Save signal flag
2843 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2844 return 0;
2845 }
2846
2847 static int SR_finalize() {
2848 return 0;
2849 }
2850
2851 static int sr_notify(OSThread* osthread) {
2852 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2853 assert_status(status == 0, status, "pthread_kill");
2854 return status;
2855 }
2856
2857 // "Randomly" selected value for how long we want to spin
2858 // before bailing out on suspending a thread, also how often
2859 // we send a signal to a thread we want to resume
2860 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2861 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2862
2863 // returns true on success and false on error - really an error is fatal
2864 // but this seems the normal response to library errors
2865 static bool do_suspend(OSThread* osthread) {
2866 assert(osthread->sr.is_running(), "thread should be running");
2867 // mark as suspended and send signal
2868
2869 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2870 // failed to switch, state wasn't running?
2871 ShouldNotReachHere();
2872 return false;
2873 }
2874
2875 if (sr_notify(osthread) != 0) {
2876 // try to cancel, switch to running
2877
2878 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2879 if (result == os::SuspendResume::SR_RUNNING) {
2880 // cancelled
2881 return false;
2882 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2883 // somehow managed to suspend
2884 return true;
2885 } else {
2886 ShouldNotReachHere();
2887 return false;
2888 }
2889 }
2890
2891 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2892
2893 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2894 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2895 os::naked_yield();
2896 }
2897
2898 // timeout, try to cancel the request
2899 if (n >= RANDOMLY_LARGE_INTEGER) {
2900 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2901 if (cancelled == os::SuspendResume::SR_RUNNING) {
2902 return false;
2903 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2904 return true;
2905 } else {
2906 ShouldNotReachHere();
2907 return false;
2908 }
2909 }
2910 }
2911
2912 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2913 return true;
2914 }
2915
2916 static void do_resume(OSThread* osthread) {
2917 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2918
2919 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2920 // failed to switch to WAKEUP_REQUEST
2921 ShouldNotReachHere();
2922 return;
2923 }
2924
2925 while (!osthread->sr.is_running()) {
2926 if (sr_notify(osthread) == 0) {
2927 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2928 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2929 os::naked_yield();
2930 }
2931 }
2932 } else {
2933 ShouldNotReachHere();
2934 }
2935 }
2936
2937 guarantee(osthread->sr.is_running(), "Must be running!");
2938 }
2939
2940 ///////////////////////////////////////////////////////////////////////////////////
2941 // signal handling (except suspend/resume)
2942
2943 // This routine may be used by user applications as a "hook" to catch signals.
2944 // The user-defined signal handler must pass unrecognized signals to this
2945 // routine, and if it returns true (non-zero), then the signal handler must
2946 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2947 // routine will never retun false (zero), but instead will execute a VM panic
2948 // routine kill the process.
2949 //
2950 // If this routine returns false, it is OK to call it again. This allows
2951 // the user-defined signal handler to perform checks either before or after
2952 // the VM performs its own checks. Naturally, the user code would be making
2953 // a serious error if it tried to handle an exception (such as a null check
2954 // or breakpoint) that the VM was generating for its own correct operation.
2955 //
2956 // This routine may recognize any of the following kinds of signals:
2957 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2958 // It should be consulted by handlers for any of those signals.
2959 //
2960 // The caller of this routine must pass in the three arguments supplied
2961 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2962 // field of the structure passed to sigaction(). This routine assumes that
2963 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2964 //
2965 // Note that the VM will print warnings if it detects conflicting signal
2966 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2967 //
2968 extern "C" JNIEXPORT int
2969 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2970
2971 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2972 // to be the thing to call; documentation is not terribly clear about whether
2973 // pthread_sigmask also works, and if it does, whether it does the same.
2974 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2975 const int rc = ::pthread_sigmask(how, set, oset);
2976 // return value semantics differ slightly for error case:
2977 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2978 // (so, pthread_sigmask is more theadsafe for error handling)
2979 // But success is always 0.
2980 return rc == 0 ? true : false;
2981 }
2982
2983 // Function to unblock all signals which are, according
2984 // to POSIX, typical program error signals. If they happen while being blocked,
2985 // they typically will bring down the process immediately.
2986 bool unblock_program_error_signals() {
2987 sigset_t set;
2988 ::sigemptyset(&set);
2989 ::sigaddset(&set, SIGILL);
2990 ::sigaddset(&set, SIGBUS);
2991 ::sigaddset(&set, SIGFPE);
2992 ::sigaddset(&set, SIGSEGV);
2993 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2994 }
2995
2996 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2997 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2998 assert(info != NULL && uc != NULL, "it must be old kernel");
2999
3000 // Never leave program error signals blocked;
3001 // on all our platforms they would bring down the process immediately when
3002 // getting raised while being blocked.
3003 unblock_program_error_signals();
3004
3005 int orig_errno = errno; // Preserve errno value over signal handler.
3006 JVM_handle_aix_signal(sig, info, uc, true);
3007 errno = orig_errno;
3008 }
3009
3010 // This boolean allows users to forward their own non-matching signals
3011 // to JVM_handle_aix_signal, harmlessly.
3012 bool os::Aix::signal_handlers_are_installed = false;
3013
3014 // For signal-chaining
3015 bool os::Aix::libjsig_is_loaded = false;
3016 typedef struct sigaction *(*get_signal_t)(int);
3017 get_signal_t os::Aix::get_signal_action = NULL;
3018
3019 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3020 struct sigaction *actp = NULL;
3021
3022 if (libjsig_is_loaded) {
3023 // Retrieve the old signal handler from libjsig
3024 actp = (*get_signal_action)(sig);
3025 }
3026 if (actp == NULL) {
3027 // Retrieve the preinstalled signal handler from jvm
3028 actp = os::Posix::get_preinstalled_handler(sig);
3029 }
3030
3031 return actp;
3032 }
3033
3034 static bool call_chained_handler(struct sigaction *actp, int sig,
3035 siginfo_t *siginfo, void *context) {
3036 // Call the old signal handler
3037 if (actp->sa_handler == SIG_DFL) {
3038 // It's more reasonable to let jvm treat it as an unexpected exception
3039 // instead of taking the default action.
3040 return false;
3041 } else if (actp->sa_handler != SIG_IGN) {
3042 if ((actp->sa_flags & SA_NODEFER) == 0) {
3043 // automaticlly block the signal
3044 sigaddset(&(actp->sa_mask), sig);
3045 }
3046
3047 sa_handler_t hand = NULL;
3048 sa_sigaction_t sa = NULL;
3049 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3050 // retrieve the chained handler
3051 if (siginfo_flag_set) {
3052 sa = actp->sa_sigaction;
3053 } else {
3054 hand = actp->sa_handler;
3055 }
3056
3057 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3058 actp->sa_handler = SIG_DFL;
3059 }
3060
3061 // try to honor the signal mask
3062 sigset_t oset;
3063 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3064
3065 // call into the chained handler
3066 if (siginfo_flag_set) {
3067 (*sa)(sig, siginfo, context);
3068 } else {
3069 (*hand)(sig);
3070 }
3071
3072 // restore the signal mask
3073 pthread_sigmask(SIG_SETMASK, &oset, 0);
3074 }
3075 // Tell jvm's signal handler the signal is taken care of.
3076 return true;
3077 }
3078
3079 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3080 bool chained = false;
3081 // signal-chaining
3082 if (UseSignalChaining) {
3083 struct sigaction *actp = get_chained_signal_action(sig);
3084 if (actp != NULL) {
3085 chained = call_chained_handler(actp, sig, siginfo, context);
3086 }
3087 }
3088 return chained;
3089 }
3090
3091 // for diagnostic
3092 int sigflags[NSIG];
3093
3094 int os::Aix::get_our_sigflags(int sig) {
3095 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3096 return sigflags[sig];
3097 }
3098
3099 void os::Aix::set_our_sigflags(int sig, int flags) {
3100 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3101 if (sig > 0 && sig < NSIG) {
3102 sigflags[sig] = flags;
3103 }
3104 }
3105
3106 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3107 // Check for overwrite.
3108 struct sigaction oldAct;
3109 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3110
3111 void* oldhand = oldAct.sa_sigaction
3112 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3113 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3114 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3115 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3116 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3117 if (AllowUserSignalHandlers || !set_installed) {
3118 // Do not overwrite; user takes responsibility to forward to us.
3119 return;
3120 } else if (UseSignalChaining) {
3121 // save the old handler in jvm
3122 os::Posix::save_preinstalled_handler(sig, oldAct);
3123 // libjsig also interposes the sigaction() call below and saves the
3124 // old sigaction on it own.
3125 } else {
3126 fatal("Encountered unexpected pre-existing sigaction handler "
3127 "%#lx for signal %d.", (long)oldhand, sig);
3128 }
3129 }
3130
3131 struct sigaction sigAct;
3132 sigfillset(&(sigAct.sa_mask));
3133 if (!set_installed) {
3134 sigAct.sa_handler = SIG_DFL;
3135 sigAct.sa_flags = SA_RESTART;
3136 } else {
3137 sigAct.sa_sigaction = javaSignalHandler;
3138 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3139 }
3140 // Save flags, which are set by ours
3141 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3142 sigflags[sig] = sigAct.sa_flags;
3143
3144 int ret = sigaction(sig, &sigAct, &oldAct);
3145 assert(ret == 0, "check");
3146
3147 void* oldhand2 = oldAct.sa_sigaction
3148 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3149 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3150 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3151 }
3152
3153 // install signal handlers for signals that HotSpot needs to
3154 // handle in order to support Java-level exception handling.
3155 void os::Aix::install_signal_handlers() {
3156 if (!signal_handlers_are_installed) {
3157 signal_handlers_are_installed = true;
3158
3159 // signal-chaining
3160 typedef void (*signal_setting_t)();
3161 signal_setting_t begin_signal_setting = NULL;
3162 signal_setting_t end_signal_setting = NULL;
3163 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3164 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3165 if (begin_signal_setting != NULL) {
3166 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3167 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3168 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3169 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3170 libjsig_is_loaded = true;
3171 assert(UseSignalChaining, "should enable signal-chaining");
3172 }
3173 if (libjsig_is_loaded) {
3174 // Tell libjsig jvm is setting signal handlers.
3175 (*begin_signal_setting)();
3176 }
3177
3178 set_signal_handler(SIGSEGV, true);
3179 set_signal_handler(SIGPIPE, true);
3180 set_signal_handler(SIGBUS, true);
3181 set_signal_handler(SIGILL, true);
3182 set_signal_handler(SIGFPE, true);
3183 set_signal_handler(SIGTRAP, true);
3184 set_signal_handler(SIGXFSZ, true);
3185
3186 if (libjsig_is_loaded) {
3187 // Tell libjsig jvm finishes setting signal handlers.
3188 (*end_signal_setting)();
3189 }
3190
3191 // We don't activate signal checker if libjsig is in place, we trust ourselves
3192 // and if UserSignalHandler is installed all bets are off.
3193 // Log that signal checking is off only if -verbose:jni is specified.
3194 if (CheckJNICalls) {
3195 if (libjsig_is_loaded) {
3196 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3197 check_signals = false;
3198 }
3199 if (AllowUserSignalHandlers) {
3200 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3201 check_signals = false;
3202 }
3203 // Need to initialize check_signal_done.
3204 ::sigemptyset(&check_signal_done);
3205 }
3206 }
3207 }
3208
3209 static const char* get_signal_handler_name(address handler,
3210 char* buf, int buflen) {
3211 int offset;
3212 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3213 if (found) {
3214 // skip directory names
3215 const char *p1, *p2;
3216 p1 = buf;
3217 size_t len = strlen(os::file_separator());
3218 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3219 // The way os::dll_address_to_library_name is implemented on Aix
3220 // right now, it always returns -1 for the offset which is not
3221 // terribly informative.
3222 // Will fix that. For now, omit the offset.
3223 jio_snprintf(buf, buflen, "%s", p1);
3224 } else {
3225 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3226 }
3227 return buf;
3228 }
3229
3230 static void print_signal_handler(outputStream* st, int sig,
3231 char* buf, size_t buflen) {
3232 struct sigaction sa;
3233 sigaction(sig, NULL, &sa);
3234
3235 st->print("%s: ", os::exception_name(sig, buf, buflen));
3236
3237 address handler = (sa.sa_flags & SA_SIGINFO)
3238 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3239 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3240
3241 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3242 st->print("SIG_DFL");
3243 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3244 st->print("SIG_IGN");
3245 } else {
3246 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3247 }
3248
3249 // Print readable mask.
3250 st->print(", sa_mask[0]=");
3251 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3252
3253 address rh = VMError::get_resetted_sighandler(sig);
3254 // May be, handler was resetted by VMError?
3255 if (rh != NULL) {
3256 handler = rh;
3257 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3258 }
3259
3260 // Print textual representation of sa_flags.
3261 st->print(", sa_flags=");
3262 os::Posix::print_sa_flags(st, sa.sa_flags);
3263
3264 // Check: is it our handler?
3265 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3266 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3267 // It is our signal handler.
3268 // Check for flags, reset system-used one!
3269 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3270 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3271 os::Aix::get_our_sigflags(sig));
3272 }
3273 }
3274 st->cr();
3275 }
3276
3277 #define DO_SIGNAL_CHECK(sig) \
3278 if (!sigismember(&check_signal_done, sig)) \
3279 os::Aix::check_signal_handler(sig)
3280
3281 // This method is a periodic task to check for misbehaving JNI applications
3282 // under CheckJNI, we can add any periodic checks here
3283
3284 void os::run_periodic_checks() {
3285
3286 if (check_signals == false) return;
3287
3288 // SEGV and BUS if overridden could potentially prevent
3289 // generation of hs*.log in the event of a crash, debugging
3290 // such a case can be very challenging, so we absolutely
3291 // check the following for a good measure:
3292 DO_SIGNAL_CHECK(SIGSEGV);
3293 DO_SIGNAL_CHECK(SIGILL);
3294 DO_SIGNAL_CHECK(SIGFPE);
3295 DO_SIGNAL_CHECK(SIGBUS);
3296 DO_SIGNAL_CHECK(SIGPIPE);
3297 DO_SIGNAL_CHECK(SIGXFSZ);
3298 if (UseSIGTRAP) {
3299 DO_SIGNAL_CHECK(SIGTRAP);
3300 }
3301
3302 // ReduceSignalUsage allows the user to override these handlers
3303 // see comments at the very top and jvm_md.h
3304 if (!ReduceSignalUsage) {
3305 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3306 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3307 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3308 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3309 }
3310
3311 DO_SIGNAL_CHECK(SR_signum);
3312 }
3313
3314 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3315
3316 static os_sigaction_t os_sigaction = NULL;
3317
3318 void os::Aix::check_signal_handler(int sig) {
3319 char buf[O_BUFLEN];
3320 address jvmHandler = NULL;
3321
3322 struct sigaction act;
3323 if (os_sigaction == NULL) {
3324 // only trust the default sigaction, in case it has been interposed
3325 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3326 if (os_sigaction == NULL) return;
3327 }
3328
3329 os_sigaction(sig, (struct sigaction*)NULL, &act);
3330
3331 address thisHandler = (act.sa_flags & SA_SIGINFO)
3332 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3333 : CAST_FROM_FN_PTR(address, act.sa_handler);
3334
3335 switch(sig) {
3336 case SIGSEGV:
3337 case SIGBUS:
3338 case SIGFPE:
3339 case SIGPIPE:
3340 case SIGILL:
3341 case SIGXFSZ:
3342 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3343 break;
3344
3345 case SHUTDOWN1_SIGNAL:
3346 case SHUTDOWN2_SIGNAL:
3347 case SHUTDOWN3_SIGNAL:
3348 case BREAK_SIGNAL:
3349 jvmHandler = (address)user_handler();
3350 break;
3351
3352 default:
3353 if (sig == SR_signum) {
3354 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3355 } else {
3356 return;
3357 }
3358 break;
3359 }
3360
3361 if (thisHandler != jvmHandler) {
3362 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3363 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3364 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3365 // No need to check this sig any longer
3366 sigaddset(&check_signal_done, sig);
3367 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3368 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3369 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3370 exception_name(sig, buf, O_BUFLEN));
3371 }
3372 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3373 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3374 tty->print("expected:");
3375 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3376 tty->cr();
3377 tty->print(" found:");
3378 os::Posix::print_sa_flags(tty, act.sa_flags);
3379 tty->cr();
3380 // No need to check this sig any longer
3381 sigaddset(&check_signal_done, sig);
3382 }
3383
3384 // Dump all the signal
3385 if (sigismember(&check_signal_done, sig)) {
3386 print_signal_handlers(tty, buf, O_BUFLEN);
3387 }
3388 }
3389
3390 // To install functions for atexit system call
3391 extern "C" {
3392 static void perfMemory_exit_helper() {
3393 perfMemory_exit();
3394 }
3395 }
3396
3397 // This is called _before_ the most of global arguments have been parsed.
3398 void os::init(void) {
3399 // This is basic, we want to know if that ever changes.
3400 // (Shared memory boundary is supposed to be a 256M aligned.)
3401 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3402
3403 // Record process break at startup.
3404 g_brk_at_startup = (address) ::sbrk(0);
3405 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3406
3407 // First off, we need to know whether we run on AIX or PASE, and
3408 // the OS level we run on.
3409 os::Aix::initialize_os_info();
3410
3411 // Scan environment (SPEC1170 behaviour, etc).
3412 os::Aix::scan_environment();
3413
3414 // Probe multipage support.
3415 query_multipage_support();
3416
3417 // Act like we only have one page size by eliminating corner cases which
3418 // we did not support very well anyway.
3419 // We have two input conditions:
3420 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3421 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3422 // setting.
3423 // Data segment page size is important for us because it defines the thread stack page
3424 // size, which is needed for guard page handling, stack banging etc.
3425 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3426 // and should be allocated with 64k pages.
3427 //
3428 // So, we do the following:
3429 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3430 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3431 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3432 // 64k no --- AIX 5.2 ? ---
3433 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3434
3435 // We explicitly leave no option to change page size, because only upgrading would work,
3436 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3437
3438 if (g_multipage_support.datapsize == 4*K) {
3439 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3440 if (g_multipage_support.can_use_64K_pages) {
3441 // .. but we are able to use 64K pages dynamically.
3442 // This would be typical for java launchers which are not linked
3443 // with datapsize=64K (like, any other launcher but our own).
3444 //
3445 // In this case it would be smart to allocate the java heap with 64K
3446 // to get the performance benefit, and to fake 64k pages for the
3447 // data segment (when dealing with thread stacks).
3448 //
3449 // However, leave a possibility to downgrade to 4K, using
3450 // -XX:-Use64KPages.
3451 if (Use64KPages) {
3452 trcVerbose("64K page mode (faked for data segment)");
3453 Aix::_page_size = 64*K;
3454 } else {
3455 trcVerbose("4K page mode (Use64KPages=off)");
3456 Aix::_page_size = 4*K;
3457 }
3458 } else {
3459 // .. and not able to allocate 64k pages dynamically. Here, just
3460 // fall back to 4K paged mode and use mmap for everything.
3461 trcVerbose("4K page mode");
3462 Aix::_page_size = 4*K;
3463 FLAG_SET_ERGO(Use64KPages, false);
3464 }
3465 } else {
3466 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3467 // This normally means that we can allocate 64k pages dynamically.
3468 // (There is one special case where this may be false: EXTSHM=on.
3469 // but we decided to not support that mode).
3470 assert0(g_multipage_support.can_use_64K_pages);
3471 Aix::_page_size = 64*K;
3472 trcVerbose("64K page mode");
3473 FLAG_SET_ERGO(Use64KPages, true);
3474 }
3475
3476 // For now UseLargePages is just ignored.
3477 FLAG_SET_ERGO(UseLargePages, false);
3478 _page_sizes[0] = 0;
3479
3480 // debug trace
3481 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3482
3483 // Next, we need to initialize libo4 and libperfstat libraries.
3484 if (os::Aix::on_pase()) {
3485 os::Aix::initialize_libo4();
3486 } else {
3487 os::Aix::initialize_libperfstat();
3488 }
3489
3490 // Reset the perfstat information provided by ODM.
3491 if (os::Aix::on_aix()) {
3492 libperfstat::perfstat_reset();
3493 }
3494
3495 // Now initialze basic system properties. Note that for some of the values we
3496 // need libperfstat etc.
3497 os::Aix::initialize_system_info();
3498
3499 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3500
3501 init_random(1234567);
3502
3503 // _main_thread points to the thread that created/loaded the JVM.
3504 Aix::_main_thread = pthread_self();
3505
3506 initial_time_count = os::elapsed_counter();
3507
3508 os::Posix::init();
3509 }
3510
3511 // This is called _after_ the global arguments have been parsed.
3512 jint os::init_2(void) {
3513
3514 // This could be set after os::Posix::init() but all platforms
3515 // have to set it the same so we have to mirror Solaris.
3516 DEBUG_ONLY(os::set_mutex_init_done();)
3517
3518 os::Posix::init_2();
3519
3520 if (os::Aix::on_pase()) {
3521 trcVerbose("Running on PASE.");
3522 } else {
3523 trcVerbose("Running on AIX (not PASE).");
3524 }
3525
3526 trcVerbose("processor count: %d", os::_processor_count);
3527 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3528
3529 // Initially build up the loaded dll map.
3530 LoadedLibraries::reload();
3531 if (Verbose) {
3532 trcVerbose("Loaded Libraries: ");
3533 LoadedLibraries::print(tty);
3534 }
3535
3536 // initialize suspend/resume support - must do this before signal_sets_init()
3537 if (SR_initialize() != 0) {
3538 perror("SR_initialize failed");
3539 return JNI_ERR;
3540 }
3541
3542 Aix::signal_sets_init();
3543 Aix::install_signal_handlers();
3544 // Initialize data for jdk.internal.misc.Signal
3545 if (!ReduceSignalUsage) {
3546 jdk_misc_signal_init();
3547 }
3548
3549 // Check and sets minimum stack sizes against command line options
3550 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3551 return JNI_ERR;
3552 }
3553
3554 if (UseNUMA) {
3555 UseNUMA = false;
3556 warning("NUMA optimizations are not available on this OS.");
3557 }
3558
3559 if (MaxFDLimit) {
3560 // Set the number of file descriptors to max. print out error
3561 // if getrlimit/setrlimit fails but continue regardless.
3562 struct rlimit nbr_files;
3563 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3564 if (status != 0) {
3565 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3566 } else {
3567 nbr_files.rlim_cur = nbr_files.rlim_max;
3568 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3569 if (status != 0) {
3570 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3571 }
3572 }
3573 }
3574
3575 if (PerfAllowAtExitRegistration) {
3576 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3577 // At exit functions can be delayed until process exit time, which
3578 // can be problematic for embedded VM situations. Embedded VMs should
3579 // call DestroyJavaVM() to assure that VM resources are released.
3580
3581 // Note: perfMemory_exit_helper atexit function may be removed in
3582 // the future if the appropriate cleanup code can be added to the
3583 // VM_Exit VMOperation's doit method.
3584 if (atexit(perfMemory_exit_helper) != 0) {
3585 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3586 }
3587 }
3588
3589 return JNI_OK;
3590 }
3591
3592 // Mark the polling page as unreadable
3593 void os::make_polling_page_unreadable(void) {
3594 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3595 fatal("Could not disable polling page");
3596 }
3597 };
3598
3599 // Mark the polling page as readable
3600 void os::make_polling_page_readable(void) {
3601 // Changed according to os_linux.cpp.
3602 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3603 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3604 }
3605 };
3606
3607 int os::active_processor_count() {
3608 // User has overridden the number of active processors
3609 if (ActiveProcessorCount > 0) {
3610 log_trace(os)("active_processor_count: "
3611 "active processor count set by user : %d",
3612 ActiveProcessorCount);
3613 return ActiveProcessorCount;
3614 }
3615
3616 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3617 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3618 return online_cpus;
3619 }
3620
3621 void os::set_native_thread_name(const char *name) {
3622 // Not yet implemented.
3623 return;
3624 }
3625
3626 bool os::distribute_processes(uint length, uint* distribution) {
3627 // Not yet implemented.
3628 return false;
3629 }
3630
3631 bool os::bind_to_processor(uint processor_id) {
3632 // Not yet implemented.
3633 return false;
3634 }
3635
3636 void os::SuspendedThreadTask::internal_do_task() {
3637 if (do_suspend(_thread->osthread())) {
3638 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3639 do_task(context);
3640 do_resume(_thread->osthread());
3641 }
3642 }
3643
3644 ////////////////////////////////////////////////////////////////////////////////
3645 // debug support
3646
3647 bool os::find(address addr, outputStream* st) {
3648
3649 st->print(PTR_FORMAT ": ", addr);
3650
3651 loaded_module_t lm;
3652 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3653 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3654 st->print_cr("%s", lm.path);
3655 return true;
3656 }
3657
3658 return false;
3659 }
3660
3661 ////////////////////////////////////////////////////////////////////////////////
3662 // misc
3663
3664 // This does not do anything on Aix. This is basically a hook for being
3665 // able to use structured exception handling (thread-local exception filters)
3666 // on, e.g., Win32.
3667 void
3668 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3669 JavaCallArguments* args, Thread* thread) {
3670 f(value, method, args, thread);
3671 }
3672
3673 void os::print_statistics() {
3674 }
3675
3676 bool os::message_box(const char* title, const char* message) {
3677 int i;
3678 fdStream err(defaultStream::error_fd());
3679 for (i = 0; i < 78; i++) err.print_raw("=");
3680 err.cr();
3681 err.print_raw_cr(title);
3682 for (i = 0; i < 78; i++) err.print_raw("-");
3683 err.cr();
3684 err.print_raw_cr(message);
3685 for (i = 0; i < 78; i++) err.print_raw("=");
3686 err.cr();
3687
3688 char buf[16];
3689 // Prevent process from exiting upon "read error" without consuming all CPU
3690 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3691
3692 return buf[0] == 'y' || buf[0] == 'Y';
3693 }
3694
3695 // Is a (classpath) directory empty?
3696 bool os::dir_is_empty(const char* path) {
3697 DIR *dir = NULL;
3698 struct dirent *ptr;
3699
3700 dir = opendir(path);
3701 if (dir == NULL) return true;
3702
3703 /* Scan the directory */
3704 bool result = true;
3705 while (result && (ptr = readdir(dir)) != NULL) {
3706 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3707 result = false;
3708 }
3709 }
3710 closedir(dir);
3711 return result;
3712 }
3713
3714 // This code originates from JDK's sysOpen and open64_w
3715 // from src/solaris/hpi/src/system_md.c
3716
3717 int os::open(const char *path, int oflag, int mode) {
3718
3719 if (strlen(path) > MAX_PATH - 1) {
3720 errno = ENAMETOOLONG;
3721 return -1;
3722 }
3723 int fd;
3724
3725 fd = ::open64(path, oflag, mode);
3726 if (fd == -1) return -1;
3727
3728 // If the open succeeded, the file might still be a directory.
3729 {
3730 struct stat64 buf64;
3731 int ret = ::fstat64(fd, &buf64);
3732 int st_mode = buf64.st_mode;
3733
3734 if (ret != -1) {
3735 if ((st_mode & S_IFMT) == S_IFDIR) {
3736 errno = EISDIR;
3737 ::close(fd);
3738 return -1;
3739 }
3740 } else {
3741 ::close(fd);
3742 return -1;
3743 }
3744 }
3745
3746 // All file descriptors that are opened in the JVM and not
3747 // specifically destined for a subprocess should have the
3748 // close-on-exec flag set. If we don't set it, then careless 3rd
3749 // party native code might fork and exec without closing all
3750 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3751 // UNIXProcess.c), and this in turn might:
3752 //
3753 // - cause end-of-file to fail to be detected on some file
3754 // descriptors, resulting in mysterious hangs, or
3755 //
3756 // - might cause an fopen in the subprocess to fail on a system
3757 // suffering from bug 1085341.
3758 //
3759 // (Yes, the default setting of the close-on-exec flag is a Unix
3760 // design flaw.)
3761 //
3762 // See:
3763 // 1085341: 32-bit stdio routines should support file descriptors >255
3764 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3765 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3766 #ifdef FD_CLOEXEC
3767 {
3768 int flags = ::fcntl(fd, F_GETFD);
3769 if (flags != -1)
3770 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3771 }
3772 #endif
3773
3774 return fd;
3775 }
3776
3777 // create binary file, rewriting existing file if required
3778 int os::create_binary_file(const char* path, bool rewrite_existing) {
3779 int oflags = O_WRONLY | O_CREAT;
3780 if (!rewrite_existing) {
3781 oflags |= O_EXCL;
3782 }
3783 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3784 }
3785
3786 // return current position of file pointer
3787 jlong os::current_file_offset(int fd) {
3788 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3789 }
3790
3791 // move file pointer to the specified offset
3792 jlong os::seek_to_file_offset(int fd, jlong offset) {
3793 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3794 }
3795
3796 // This code originates from JDK's sysAvailable
3797 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3798
3799 int os::available(int fd, jlong *bytes) {
3800 jlong cur, end;
3801 int mode;
3802 struct stat64 buf64;
3803
3804 if (::fstat64(fd, &buf64) >= 0) {
3805 mode = buf64.st_mode;
3806 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3807 int n;
3808 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3809 *bytes = n;
3810 return 1;
3811 }
3812 }
3813 }
3814 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3815 return 0;
3816 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3817 return 0;
3818 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3819 return 0;
3820 }
3821 *bytes = end - cur;
3822 return 1;
3823 }
3824
3825 // Map a block of memory.
3826 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3827 char *addr, size_t bytes, bool read_only,
3828 bool allow_exec) {
3829 int prot;
3830 int flags = MAP_PRIVATE;
3831
3832 if (read_only) {
3833 prot = PROT_READ;
3834 flags = MAP_SHARED;
3835 } else {
3836 prot = PROT_READ | PROT_WRITE;
3837 flags = MAP_PRIVATE;
3838 }
3839
3840 if (allow_exec) {
3841 prot |= PROT_EXEC;
3842 }
3843
3844 if (addr != NULL) {
3845 flags |= MAP_FIXED;
3846 }
3847
3848 // Allow anonymous mappings if 'fd' is -1.
3849 if (fd == -1) {
3850 flags |= MAP_ANONYMOUS;
3851 }
3852
3853 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3854 fd, file_offset);
3855 if (mapped_address == MAP_FAILED) {
3856 return NULL;
3857 }
3858 return mapped_address;
3859 }
3860
3861 // Remap a block of memory.
3862 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3863 char *addr, size_t bytes, bool read_only,
3864 bool allow_exec) {
3865 // same as map_memory() on this OS
3866 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3867 allow_exec);
3868 }
3869
3870 // Unmap a block of memory.
3871 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3872 return munmap(addr, bytes) == 0;
3873 }
3874
3875 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3876 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3877 // of a thread.
3878 //
3879 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3880 // the fast estimate available on the platform.
3881
3882 jlong os::current_thread_cpu_time() {
3883 // return user + sys since the cost is the same
3884 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3885 assert(n >= 0, "negative CPU time");
3886 return n;
3887 }
3888
3889 jlong os::thread_cpu_time(Thread* thread) {
3890 // consistent with what current_thread_cpu_time() returns
3891 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3892 assert(n >= 0, "negative CPU time");
3893 return n;
3894 }
3895
3896 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3897 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3898 assert(n >= 0, "negative CPU time");
3899 return n;
3900 }
3901
3902 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3903 bool error = false;
3904
3905 jlong sys_time = 0;
3906 jlong user_time = 0;
3907
3908 // Reimplemented using getthrds64().
3909 //
3910 // Works like this:
3911 // For the thread in question, get the kernel thread id. Then get the
3912 // kernel thread statistics using that id.
3913 //
3914 // This only works of course when no pthread scheduling is used,
3915 // i.e. there is a 1:1 relationship to kernel threads.
3916 // On AIX, see AIXTHREAD_SCOPE variable.
3917
3918 pthread_t pthtid = thread->osthread()->pthread_id();
3919
3920 // retrieve kernel thread id for the pthread:
3921 tid64_t tid = 0;
3922 struct __pthrdsinfo pinfo;
3923 // I just love those otherworldly IBM APIs which force me to hand down
3924 // dummy buffers for stuff I dont care for...
3925 char dummy[1];
3926 int dummy_size = sizeof(dummy);
3927 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3928 dummy, &dummy_size) == 0) {
3929 tid = pinfo.__pi_tid;
3930 } else {
3931 tty->print_cr("pthread_getthrds_np failed.");
3932 error = true;
3933 }
3934
3935 // retrieve kernel timing info for that kernel thread
3936 if (!error) {
3937 struct thrdentry64 thrdentry;
3938 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3939 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3940 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3941 } else {
3942 tty->print_cr("pthread_getthrds_np failed.");
3943 error = true;
3944 }
3945 }
3946
3947 if (p_sys_time) {
3948 *p_sys_time = sys_time;
3949 }
3950
3951 if (p_user_time) {
3952 *p_user_time = user_time;
3953 }
3954
3955 if (error) {
3956 return false;
3957 }
3958
3959 return true;
3960 }
3961
3962 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3963 jlong sys_time;
3964 jlong user_time;
3965
3966 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3967 return -1;
3968 }
3969
3970 return user_sys_cpu_time ? sys_time + user_time : user_time;
3971 }
3972
3973 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3974 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3975 info_ptr->may_skip_backward = false; // elapsed time not wall time
3976 info_ptr->may_skip_forward = false; // elapsed time not wall time
3977 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3978 }
3979
3980 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3981 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3982 info_ptr->may_skip_backward = false; // elapsed time not wall time
3983 info_ptr->may_skip_forward = false; // elapsed time not wall time
3984 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3985 }
3986
3987 bool os::is_thread_cpu_time_supported() {
3988 return true;
3989 }
3990
3991 // System loadavg support. Returns -1 if load average cannot be obtained.
3992 // For now just return the system wide load average (no processor sets).
3993 int os::loadavg(double values[], int nelem) {
3994
3995 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3996 guarantee(values, "argument error");
3997
3998 if (os::Aix::on_pase()) {
3999
4000 // AS/400 PASE: use libo4 porting library
4001 double v[3] = { 0.0, 0.0, 0.0 };
4002
4003 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4004 for (int i = 0; i < nelem; i ++) {
4005 values[i] = v[i];
4006 }
4007 return nelem;
4008 } else {
4009 return -1;
4010 }
4011
4012 } else {
4013
4014 // AIX: use libperfstat
4015 libperfstat::cpuinfo_t ci;
4016 if (libperfstat::get_cpuinfo(&ci)) {
4017 for (int i = 0; i < nelem; i++) {
4018 values[i] = ci.loadavg[i];
4019 }
4020 } else {
4021 return -1;
4022 }
4023 return nelem;
4024 }
4025 }
4026
4027 void os::pause() {
4028 char filename[MAX_PATH];
4029 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4030 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4031 } else {
4032 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4033 }
4034
4035 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4036 if (fd != -1) {
4037 struct stat buf;
4038 ::close(fd);
4039 while (::stat(filename, &buf) == 0) {
4040 (void)::poll(NULL, 0, 100);
4041 }
4042 } else {
4043 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4044 }
4045 }
4046
4047 bool os::is_primordial_thread(void) {
4048 if (pthread_self() == (pthread_t)1) {
4049 return true;
4050 } else {
4051 return false;
4052 }
4053 }
4054
4055 // OS recognitions (PASE/AIX, OS level) call this before calling any
4056 // one of Aix::on_pase(), Aix::os_version() static
4057 void os::Aix::initialize_os_info() {
4058
4059 assert(_on_pase == -1 && _os_version == 0, "already called.");
4060
4061 struct utsname uts;
4062 memset(&uts, 0, sizeof(uts));
4063 strcpy(uts.sysname, "?");
4064 if (::uname(&uts) == -1) {
4065 trcVerbose("uname failed (%d)", errno);
4066 guarantee(0, "Could not determine whether we run on AIX or PASE");
4067 } else {
4068 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4069 "node \"%s\" machine \"%s\"\n",
4070 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4071 const int major = atoi(uts.version);
4072 assert(major > 0, "invalid OS version");
4073 const int minor = atoi(uts.release);
4074 assert(minor > 0, "invalid OS release");
4075 _os_version = (major << 24) | (minor << 16);
4076 char ver_str[20] = {0};
4077 const char* name_str = "unknown OS";
4078 if (strcmp(uts.sysname, "OS400") == 0) {
4079 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4080 _on_pase = 1;
4081 if (os_version_short() < 0x0504) {
4082 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4083 assert(false, "OS/400 release too old.");
4084 }
4085 name_str = "OS/400 (pase)";
4086 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4087 } else if (strcmp(uts.sysname, "AIX") == 0) {
4088 // We run on AIX. We do not support versions older than AIX 7.1.
4089 _on_pase = 0;
4090 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4091 odmWrapper::determine_os_kernel_version(&_os_version);
4092 if (os_version_short() < 0x0701) {
4093 trcVerbose("AIX releases older than AIX 7.1 are not supported.");
4094 assert(false, "AIX release too old.");
4095 }
4096 name_str = "AIX";
4097 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4098 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4099 } else {
4100 assert(false, "%s", name_str);
4101 }
4102 trcVerbose("We run on %s %s", name_str, ver_str);
4103 }
4104
4105 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4106 } // end: os::Aix::initialize_os_info()
4107
4108 // Scan environment for important settings which might effect the VM.
4109 // Trace out settings. Warn about invalid settings and/or correct them.
4110 //
4111 // Must run after os::Aix::initialue_os_info().
4112 void os::Aix::scan_environment() {
4113
4114 char* p;
4115 int rc;
4116
4117 // Warn explicity if EXTSHM=ON is used. That switch changes how
4118 // System V shared memory behaves. One effect is that page size of
4119 // shared memory cannot be change dynamically, effectivly preventing
4120 // large pages from working.
4121 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4122 // recommendation is (in OSS notes) to switch it off.
4123 p = ::getenv("EXTSHM");
4124 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4125 if (p && strcasecmp(p, "ON") == 0) {
4126 _extshm = 1;
4127 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4128 if (!AllowExtshm) {
4129 // We allow under certain conditions the user to continue. However, we want this
4130 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4131 // that the VM is not able to allocate 64k pages for the heap.
4132 // We do not want to run with reduced performance.
4133 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4134 }
4135 } else {
4136 _extshm = 0;
4137 }
4138
4139 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4140 // Not tested, not supported.
4141 //
4142 // Note that it might be worth the trouble to test and to require it, if only to
4143 // get useful return codes for mprotect.
4144 //
4145 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4146 // exec() ? before loading the libjvm ? ....)
4147 p = ::getenv("XPG_SUS_ENV");
4148 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4149 if (p && strcmp(p, "ON") == 0) {
4150 _xpg_sus_mode = 1;
4151 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4152 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4153 // clobber address ranges. If we ever want to support that, we have to do some
4154 // testing first.
4155 guarantee(false, "XPG_SUS_ENV=ON not supported");
4156 } else {
4157 _xpg_sus_mode = 0;
4158 }
4159
4160 if (os::Aix::on_pase()) {
4161 p = ::getenv("QIBM_MULTI_THREADED");
4162 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4163 }
4164
4165 p = ::getenv("LDR_CNTRL");
4166 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4167 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4168 if (p && ::strstr(p, "TEXTPSIZE")) {
4169 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4170 "you may experience hangs or crashes on OS/400 V7R1.");
4171 }
4172 }
4173
4174 p = ::getenv("AIXTHREAD_GUARDPAGES");
4175 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4176
4177 } // end: os::Aix::scan_environment()
4178
4179 // PASE: initialize the libo4 library (PASE porting library).
4180 void os::Aix::initialize_libo4() {
4181 guarantee(os::Aix::on_pase(), "OS/400 only.");
4182 if (!libo4::init()) {
4183 trcVerbose("libo4 initialization failed.");
4184 assert(false, "libo4 initialization failed");
4185 } else {
4186 trcVerbose("libo4 initialized.");
4187 }
4188 }
4189
4190 // AIX: initialize the libperfstat library.
4191 void os::Aix::initialize_libperfstat() {
4192 assert(os::Aix::on_aix(), "AIX only");
4193 if (!libperfstat::init()) {
4194 trcVerbose("libperfstat initialization failed.");
4195 assert(false, "libperfstat initialization failed");
4196 } else {
4197 trcVerbose("libperfstat initialized.");
4198 }
4199 }
4200
4201 /////////////////////////////////////////////////////////////////////////////
4202 // thread stack
4203
4204 // Get the current stack base from the OS (actually, the pthread library).
4205 // Note: usually not page aligned.
4206 address os::current_stack_base() {
4207 AixMisc::stackbounds_t bounds;
4208 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4209 guarantee(rc, "Unable to retrieve stack bounds.");
4210 return bounds.base;
4211 }
4212
4213 // Get the current stack size from the OS (actually, the pthread library).
4214 // Returned size is such that (base - size) is always aligned to page size.
4215 size_t os::current_stack_size() {
4216 AixMisc::stackbounds_t bounds;
4217 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4218 guarantee(rc, "Unable to retrieve stack bounds.");
4219 // Align the returned stack size such that the stack low address
4220 // is aligned to page size (Note: base is usually not and we do not care).
4221 // We need to do this because caller code will assume stack low address is
4222 // page aligned and will place guard pages without checking.
4223 address low = bounds.base - bounds.size;
4224 address low_aligned = (address)align_up(low, os::vm_page_size());
4225 size_t s = bounds.base - low_aligned;
4226 return s;
4227 }
4228
4229 extern char** environ;
4230
4231 // Run the specified command in a separate process. Return its exit value,
4232 // or -1 on failure (e.g. can't fork a new process).
4233 // Unlike system(), this function can be called from signal handler. It
4234 // doesn't block SIGINT et al.
4235 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4236 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL};
4237
4238 pid_t pid = fork();
4239
4240 if (pid < 0) {
4241 // fork failed
4242 return -1;
4243
4244 } else if (pid == 0) {
4245 // child process
4246
4247 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4248 execve("/usr/bin/sh", argv, environ);
4249
4250 // execve failed
4251 _exit(-1);
4252
4253 } else {
4254 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4255 // care about the actual exit code, for now.
4256
4257 int status;
4258
4259 // Wait for the child process to exit. This returns immediately if
4260 // the child has already exited. */
4261 while (waitpid(pid, &status, 0) < 0) {
4262 switch (errno) {
4263 case ECHILD: return 0;
4264 case EINTR: break;
4265 default: return -1;
4266 }
4267 }
4268
4269 if (WIFEXITED(status)) {
4270 // The child exited normally; get its exit code.
4271 return WEXITSTATUS(status);
4272 } else if (WIFSIGNALED(status)) {
4273 // The child exited because of a signal.
4274 // The best value to return is 0x80 + signal number,
4275 // because that is what all Unix shells do, and because
4276 // it allows callers to distinguish between process exit and
4277 // process death by signal.
4278 return 0x80 + WTERMSIG(status);
4279 } else {
4280 // Unknown exit code; pass it through.
4281 return status;
4282 }
4283 }
4284 return -1;
4285 }
4286
4287 // Get the default path to the core file
4288 // Returns the length of the string
4289 int os::get_core_path(char* buffer, size_t bufferSize) {
4290 const char* p = get_current_directory(buffer, bufferSize);
4291
4292 if (p == NULL) {
4293 assert(p != NULL, "failed to get current directory");
4294 return 0;
4295 }
4296
4297 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4298 p, current_process_id());
4299
4300 return strlen(buffer);
4301 }
4302
4303 #ifndef PRODUCT
4304 void TestReserveMemorySpecial_test() {
4305 // No tests available for this platform
4306 }
4307 #endif
4308
4309 bool os::start_debugging(char *buf, int buflen) {
4310 int len = (int)strlen(buf);
4311 char *p = &buf[len];
4312
4313 jio_snprintf(p, buflen -len,
4314 "\n\n"
4315 "Do you want to debug the problem?\n\n"
4316 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4317 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4318 "Otherwise, press RETURN to abort...",
4319 os::current_process_id(),
4320 os::current_thread_id(), thread_self());
4321
4322 bool yes = os::message_box("Unexpected Error", buf);
4323
4324 if (yes) {
4325 // yes, user asked VM to launch debugger
4326 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4327
4328 os::fork_and_exec(buf);
4329 yes = false;
4330 }
4331 return yes;
4332 }
4333
4334 static inline time_t get_mtime(const char* filename) {
4335 struct stat st;
4336 int ret = os::stat(filename, &st);
4337 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
4338 return st.st_mtime;
4339 }
4340
4341 int os::compare_file_modified_times(const char* file1, const char* file2) {
4342 time_t t1 = get_mtime(file1);
4343 time_t t2 = get_mtime(file2);
4344 return t1 - t2;
4345 }