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_7
136 #define PV_7 0x200000 /* Power PC 7 */
137 #endif
138 #ifndef PV_7_Compat
139 #define PV_7_Compat 0x208000 /* Power PC 7 */
140 #endif
141 #ifndef PV_8
142 #define PV_8 0x300000 /* Power PC 8 */
143 #endif
144 #ifndef PV_8_Compat
145 #define PV_8_Compat 0x308000 /* Power PC 8 */
146 #endif
147 #ifndef PV_9
148 #define PV_9 0x400000 /* Power PC 9 */
149 #endif
150 #ifndef PV_9_Compat
151 #define PV_9_Compat 0x408000 /* Power PC 9 */
152 #endif
153
154
155 static address resolve_function_descriptor_to_code_pointer(address p);
156
157 static void vmembk_print_on(outputStream* os);
158
159 ////////////////////////////////////////////////////////////////////////////////
160 // global variables (for a description see os_aix.hpp)
161
162 julong os::Aix::_physical_memory = 0;
163
164 pthread_t os::Aix::_main_thread = ((pthread_t)0);
165 int os::Aix::_page_size = -1;
166
167 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
168 int os::Aix::_on_pase = -1;
169
170 // 0 = uninitialized, otherwise 32 bit number:
171 // 0xVVRRTTSS
172 // VV - major version
173 // RR - minor version
174 // TT - tech level, if known, 0 otherwise
175 // SS - service pack, if known, 0 otherwise
176 uint32_t os::Aix::_os_version = 0;
177
178 // -1 = uninitialized, 0 - no, 1 - yes
179 int os::Aix::_xpg_sus_mode = -1;
180
181 // -1 = uninitialized, 0 - no, 1 - yes
182 int os::Aix::_extshm = -1;
183
184 ////////////////////////////////////////////////////////////////////////////////
185 // local variables
186
187 static volatile jlong max_real_time = 0;
188 static jlong initial_time_count = 0;
189 static int clock_tics_per_sec = 100;
190 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
191 static bool check_signals = true;
192 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
193 static sigset_t SR_sigset;
194
195 // Process break recorded at startup.
196 static address g_brk_at_startup = NULL;
197
198 // This describes the state of multipage support of the underlying
199 // OS. Note that this is of no interest to the outsize world and
200 // therefore should not be defined in AIX class.
201 //
202 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
203 // latter two (16M "large" resp. 16G "huge" pages) require special
204 // setup and are normally not available.
205 //
206 // AIX supports multiple page sizes per process, for:
207 // - Stack (of the primordial thread, so not relevant for us)
208 // - Data - data, bss, heap, for us also pthread stacks
209 // - Text - text code
210 // - shared memory
211 //
212 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
213 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
214 //
215 // For shared memory, page size can be set dynamically via
216 // shmctl(). Different shared memory regions can have different page
217 // sizes.
218 //
219 // More information can be found at AIBM info center:
220 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
221 //
222 static struct {
223 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
224 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
225 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
226 size_t pthr_stack_pagesize; // stack page size of pthread threads
227 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
228 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
229 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
230 int error; // Error describing if something went wrong at multipage init.
231 } g_multipage_support = {
232 (size_t) -1,
233 (size_t) -1,
234 (size_t) -1,
235 (size_t) -1,
236 (size_t) -1,
237 false, false,
238 0
239 };
240
241 // We must not accidentally allocate memory close to the BRK - even if
242 // that would work - because then we prevent the BRK segment from
243 // growing which may result in a malloc OOM even though there is
244 // enough memory. The problem only arises if we shmat() or mmap() at
245 // a specific wish address, e.g. to place the heap in a
246 // compressed-oops-friendly way.
247 static bool is_close_to_brk(address a) {
248 assert0(g_brk_at_startup != NULL);
249 if (a >= g_brk_at_startup &&
250 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
251 return true;
252 }
253 return false;
254 }
255
256 julong os::available_memory() {
257 return Aix::available_memory();
258 }
259
260 julong os::Aix::available_memory() {
261 // Avoid expensive API call here, as returned value will always be null.
262 if (os::Aix::on_pase()) {
263 return 0x0LL;
264 }
265 os::Aix::meminfo_t mi;
266 if (os::Aix::get_meminfo(&mi)) {
267 return mi.real_free;
268 } else {
269 return ULONG_MAX;
270 }
271 }
272
273 julong os::physical_memory() {
274 return Aix::physical_memory();
275 }
276
277 // Return true if user is running as root.
278
279 bool os::have_special_privileges() {
280 static bool init = false;
281 static bool privileges = false;
282 if (!init) {
283 privileges = (getuid() != geteuid()) || (getgid() != getegid());
284 init = true;
285 }
286 return privileges;
287 }
288
289 // Helper function, emulates disclaim64 using multiple 32bit disclaims
290 // because we cannot use disclaim64() on AS/400 and old AIX releases.
291 static bool my_disclaim64(char* addr, size_t size) {
292
293 if (size == 0) {
294 return true;
295 }
296
297 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
298 const unsigned int maxDisclaimSize = 0x40000000;
299
300 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
301 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
302
303 char* p = addr;
304
305 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
306 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
307 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
308 return false;
309 }
310 p += maxDisclaimSize;
311 }
312
313 if (lastDisclaimSize > 0) {
314 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
315 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
316 return false;
317 }
318 }
319
320 return true;
321 }
322
323 // Cpu architecture string
324 #if defined(PPC32)
325 static char cpu_arch[] = "ppc";
326 #elif defined(PPC64)
327 static char cpu_arch[] = "ppc64";
328 #else
329 #error Add appropriate cpu_arch setting
330 #endif
331
332 // Wrap the function "vmgetinfo" which is not available on older OS releases.
333 static int checked_vmgetinfo(void *out, int command, int arg) {
334 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
335 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
336 }
337 return ::vmgetinfo(out, command, arg);
338 }
339
340 // Given an address, returns the size of the page backing that address.
341 size_t os::Aix::query_pagesize(void* addr) {
342
343 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
344 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
345 return 4*K;
346 }
347
348 vm_page_info pi;
349 pi.addr = (uint64_t)addr;
350 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
351 return pi.pagesize;
352 } else {
353 assert(false, "vmgetinfo failed to retrieve page size");
354 return 4*K;
355 }
356 }
357
358 void os::Aix::initialize_system_info() {
359
360 // Get the number of online(logical) cpus instead of configured.
361 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
362 assert(_processor_count > 0, "_processor_count must be > 0");
363
364 // Retrieve total physical storage.
365 os::Aix::meminfo_t mi;
366 if (!os::Aix::get_meminfo(&mi)) {
367 assert(false, "os::Aix::get_meminfo failed.");
368 }
369 _physical_memory = (julong) mi.real_total;
370 }
371
372 // Helper function for tracing page sizes.
373 static const char* describe_pagesize(size_t pagesize) {
374 switch (pagesize) {
375 case 4*K : return "4K";
376 case 64*K: return "64K";
377 case 16*M: return "16M";
378 case 16*G: return "16G";
379 default:
380 assert(false, "surprise");
381 return "??";
382 }
383 }
384
385 // Probe OS for multipage support.
386 // Will fill the global g_multipage_support structure.
387 // Must be called before calling os::large_page_init().
388 static void query_multipage_support() {
389
390 guarantee(g_multipage_support.pagesize == -1,
391 "do not call twice");
392
393 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
394
395 // This really would surprise me.
396 assert(g_multipage_support.pagesize == 4*K, "surprise!");
397
398 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
399 // Default data page size is defined either by linker options (-bdatapsize)
400 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
401 // default should be 4K.
402 {
403 void* p = ::malloc(16*M);
404 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
405 ::free(p);
406 }
407
408 // Query default shm page size (LDR_CNTRL SHMPSIZE).
409 // Note that this is pure curiosity. We do not rely on default page size but set
410 // our own page size after allocated.
411 {
412 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
413 guarantee(shmid != -1, "shmget failed");
414 void* p = ::shmat(shmid, NULL, 0);
415 ::shmctl(shmid, IPC_RMID, NULL);
416 guarantee(p != (void*) -1, "shmat failed");
417 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
418 ::shmdt(p);
419 }
420
421 // Before querying the stack page size, make sure we are not running as primordial
422 // thread (because primordial thread's stack may have different page size than
423 // pthread thread stacks). Running a VM on the primordial thread won't work for a
424 // number of reasons so we may just as well guarantee it here.
425 guarantee0(!os::is_primordial_thread());
426
427 // Query pthread stack page size. Should be the same as data page size because
428 // pthread stacks are allocated from C-Heap.
429 {
430 int dummy = 0;
431 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
432 }
433
434 // Query default text page size (LDR_CNTRL TEXTPSIZE).
435 {
436 address any_function =
437 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
438 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
439 }
440
441 // Now probe for support of 64K pages and 16M pages.
442
443 // Before OS/400 V6R1, there is no support for pages other than 4K.
444 if (os::Aix::on_pase_V5R4_or_older()) {
445 trcVerbose("OS/400 < V6R1 - no large page support.");
446 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
447 goto query_multipage_support_end;
448 }
449
450 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
451 {
452 const int MAX_PAGE_SIZES = 4;
453 psize_t sizes[MAX_PAGE_SIZES];
454 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
455 if (num_psizes == -1) {
456 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
457 trcVerbose("disabling multipage support.");
458 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
459 goto query_multipage_support_end;
460 }
461 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
462 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
463 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
464 for (int i = 0; i < num_psizes; i ++) {
465 trcVerbose(" %s ", describe_pagesize(sizes[i]));
466 }
467
468 // Can we use 64K, 16M pages?
469 for (int i = 0; i < num_psizes; i ++) {
470 const size_t pagesize = sizes[i];
471 if (pagesize != 64*K && pagesize != 16*M) {
472 continue;
473 }
474 bool can_use = false;
475 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
476 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
477 IPC_CREAT | S_IRUSR | S_IWUSR);
478 guarantee0(shmid != -1); // Should always work.
479 // Try to set pagesize.
480 struct shmid_ds shm_buf = { 0 };
481 shm_buf.shm_pagesize = pagesize;
482 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
483 const int en = errno;
484 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
485 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno);
486 } else {
487 // Attach and double check pageisze.
488 void* p = ::shmat(shmid, NULL, 0);
489 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
490 guarantee0(p != (void*) -1); // Should always work.
491 const size_t real_pagesize = os::Aix::query_pagesize(p);
492 if (real_pagesize != pagesize) {
493 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize);
494 } else {
495 can_use = true;
496 }
497 ::shmdt(p);
498 }
499 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
500 if (pagesize == 64*K) {
501 g_multipage_support.can_use_64K_pages = can_use;
502 } else if (pagesize == 16*M) {
503 g_multipage_support.can_use_16M_pages = can_use;
504 }
505 }
506
507 } // end: check which pages can be used for shared memory
508
509 query_multipage_support_end:
510
511 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
512 describe_pagesize(g_multipage_support.pagesize));
513 trcVerbose("Data page size (C-Heap, bss, etc): %s",
514 describe_pagesize(g_multipage_support.datapsize));
515 trcVerbose("Text page size: %s",
516 describe_pagesize(g_multipage_support.textpsize));
517 trcVerbose("Thread stack page size (pthread): %s",
518 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
519 trcVerbose("Default shared memory page size: %s",
520 describe_pagesize(g_multipage_support.shmpsize));
521 trcVerbose("Can use 64K pages dynamically with shared memory: %s",
522 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
523 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
524 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
525 trcVerbose("Multipage error details: %d",
526 g_multipage_support.error);
527
528 // sanity checks
529 assert0(g_multipage_support.pagesize == 4*K);
530 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
531 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
532 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
533 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
534
535 }
536
537 void os::init_system_properties_values() {
538
539 #ifndef OVERRIDE_LIBPATH
540 #define DEFAULT_LIBPATH "/lib:/usr/lib"
541 #else
542 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
543 #endif
544 #define EXTENSIONS_DIR "/lib/ext"
545
546 // Buffer that fits several sprintfs.
547 // Note that the space for the trailing null is provided
548 // by the nulls included by the sizeof operator.
549 const size_t bufsize =
550 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
551 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
552 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
553
554 // sysclasspath, java_home, dll_dir
555 {
556 char *pslash;
557 os::jvm_path(buf, bufsize);
558
559 // Found the full path to libjvm.so.
560 // Now cut the path to <java_home>/jre if we can.
561 pslash = strrchr(buf, '/');
562 if (pslash != NULL) {
563 *pslash = '\0'; // Get rid of /libjvm.so.
564 }
565 pslash = strrchr(buf, '/');
566 if (pslash != NULL) {
567 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
568 }
569 Arguments::set_dll_dir(buf);
570
571 if (pslash != NULL) {
572 pslash = strrchr(buf, '/');
573 if (pslash != NULL) {
574 *pslash = '\0'; // Get rid of /lib.
575 }
576 }
577 Arguments::set_java_home(buf);
578 if (!set_boot_path('/', ':')) {
579 vm_exit_during_initialization("Failed setting boot class path.", NULL);
580 }
581 }
582
583 // Where to look for native libraries.
584
585 // On Aix we get the user setting of LIBPATH.
586 // Eventually, all the library path setting will be done here.
587 // Get the user setting of LIBPATH.
588 const char *v = ::getenv("LIBPATH");
589 const char *v_colon = ":";
590 if (v == NULL) { v = ""; v_colon = ""; }
591
592 // Concatenate user and invariant part of ld_library_path.
593 // That's +1 for the colon and +1 for the trailing '\0'.
594 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
595 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
596 Arguments::set_library_path(ld_library_path);
597 FREE_C_HEAP_ARRAY(char, ld_library_path);
598
599 // Extensions directories.
600 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
601 Arguments::set_ext_dirs(buf);
602
603 FREE_C_HEAP_ARRAY(char, buf);
604
605 #undef DEFAULT_LIBPATH
606 #undef EXTENSIONS_DIR
607 }
608
609 ////////////////////////////////////////////////////////////////////////////////
610 // breakpoint support
611
612 void os::breakpoint() {
613 BREAKPOINT;
614 }
615
616 extern "C" void breakpoint() {
617 // use debugger to set breakpoint here
618 }
619
620 ////////////////////////////////////////////////////////////////////////////////
621 // signal support
622
623 debug_only(static bool signal_sets_initialized = false);
624 static sigset_t unblocked_sigs, vm_sigs;
625
626 void os::Aix::signal_sets_init() {
627 // Should also have an assertion stating we are still single-threaded.
628 assert(!signal_sets_initialized, "Already initialized");
629 // Fill in signals that are necessarily unblocked for all threads in
630 // the VM. Currently, we unblock the following signals:
631 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
632 // by -Xrs (=ReduceSignalUsage));
633 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
634 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
635 // the dispositions or masks wrt these signals.
636 // Programs embedding the VM that want to use the above signals for their
637 // own purposes must, at this time, use the "-Xrs" option to prevent
638 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
639 // (See bug 4345157, and other related bugs).
640 // In reality, though, unblocking these signals is really a nop, since
641 // these signals are not blocked by default.
642 sigemptyset(&unblocked_sigs);
643 sigaddset(&unblocked_sigs, SIGILL);
644 sigaddset(&unblocked_sigs, SIGSEGV);
645 sigaddset(&unblocked_sigs, SIGBUS);
646 sigaddset(&unblocked_sigs, SIGFPE);
647 sigaddset(&unblocked_sigs, SIGTRAP);
648 sigaddset(&unblocked_sigs, SR_signum);
649
650 if (!ReduceSignalUsage) {
651 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
652 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
653 }
654 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
655 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
656 }
657 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
658 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
659 }
660 }
661 // Fill in signals that are blocked by all but the VM thread.
662 sigemptyset(&vm_sigs);
663 if (!ReduceSignalUsage)
664 sigaddset(&vm_sigs, BREAK_SIGNAL);
665 debug_only(signal_sets_initialized = true);
666 }
667
668 // These are signals that are unblocked while a thread is running Java.
669 // (For some reason, they get blocked by default.)
670 sigset_t* os::Aix::unblocked_signals() {
671 assert(signal_sets_initialized, "Not initialized");
672 return &unblocked_sigs;
673 }
674
675 // These are the signals that are blocked while a (non-VM) thread is
676 // running Java. Only the VM thread handles these signals.
677 sigset_t* os::Aix::vm_signals() {
678 assert(signal_sets_initialized, "Not initialized");
679 return &vm_sigs;
680 }
681
682 void os::Aix::hotspot_sigmask(Thread* thread) {
683
684 //Save caller's signal mask before setting VM signal mask
685 sigset_t caller_sigmask;
686 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
687
688 OSThread* osthread = thread->osthread();
689 osthread->set_caller_sigmask(caller_sigmask);
690
691 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
692
693 if (!ReduceSignalUsage) {
694 if (thread->is_VM_thread()) {
695 // Only the VM thread handles BREAK_SIGNAL ...
696 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
697 } else {
698 // ... all other threads block BREAK_SIGNAL
699 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
700 }
701 }
702 }
703
704 // retrieve memory information.
705 // Returns false if something went wrong;
706 // content of pmi undefined in this case.
707 bool os::Aix::get_meminfo(meminfo_t* pmi) {
708
709 assert(pmi, "get_meminfo: invalid parameter");
710
711 memset(pmi, 0, sizeof(meminfo_t));
712
713 if (os::Aix::on_pase()) {
714 // On PASE, use the libo4 porting library.
715
716 unsigned long long virt_total = 0;
717 unsigned long long real_total = 0;
718 unsigned long long real_free = 0;
719 unsigned long long pgsp_total = 0;
720 unsigned long long pgsp_free = 0;
721 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
722 pmi->virt_total = virt_total;
723 pmi->real_total = real_total;
724 pmi->real_free = real_free;
725 pmi->pgsp_total = pgsp_total;
726 pmi->pgsp_free = pgsp_free;
727 return true;
728 }
729 return false;
730
731 } else {
732
733 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
734 // See:
735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
736 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
737 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
738 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
739
740 perfstat_memory_total_t psmt;
741 memset (&psmt, '\0', sizeof(psmt));
742 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
743 if (rc == -1) {
744 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
745 assert(0, "perfstat_memory_total() failed");
746 return false;
747 }
748
749 assert(rc == 1, "perfstat_memory_total() - weird return code");
750
751 // excerpt from
752 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
753 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
754 // The fields of perfstat_memory_total_t:
755 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
756 // u_longlong_t real_total Total real memory (in 4 KB pages).
757 // u_longlong_t real_free Free real memory (in 4 KB pages).
758 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
759 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
760
761 pmi->virt_total = psmt.virt_total * 4096;
762 pmi->real_total = psmt.real_total * 4096;
763 pmi->real_free = psmt.real_free * 4096;
764 pmi->pgsp_total = psmt.pgsp_total * 4096;
765 pmi->pgsp_free = psmt.pgsp_free * 4096;
766
767 return true;
768
769 }
770 } // end os::Aix::get_meminfo
771
772 //////////////////////////////////////////////////////////////////////////////
773 // create new thread
774
775 // Thread start routine for all newly created threads
776 static void *thread_native_entry(Thread *thread) {
777
778 thread->record_stack_base_and_size();
779
780 const pthread_t pthread_id = ::pthread_self();
781 const tid_t kernel_thread_id = ::thread_self();
782
783 LogTarget(Info, os, thread) lt;
784 if (lt.is_enabled()) {
785 address low_address = thread->stack_end();
786 address high_address = thread->stack_base();
787 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
788 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
789 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
790 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
791 }
792
793 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
794 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
795 // tools hook pthread_create(). In this case, we may run into problems establishing
796 // guard pages on those stacks, because the stacks may reside in memory which is not
797 // protectable (shmated).
798 if (thread->stack_base() > ::sbrk(0)) {
799 log_warning(os, thread)("Thread stack not in data segment.");
800 }
801
802 // Try to randomize the cache line index of hot stack frames.
803 // This helps when threads of the same stack traces evict each other's
804 // cache lines. The threads can be either from the same JVM instance, or
805 // from different JVM instances. The benefit is especially true for
806 // processors with hyperthreading technology.
807
808 static int counter = 0;
809 int pid = os::current_process_id();
810 alloca(((pid ^ counter++) & 7) * 128);
811
812 thread->initialize_thread_current();
813
814 OSThread* osthread = thread->osthread();
815
816 // Thread_id is pthread id.
817 osthread->set_thread_id(pthread_id);
818
819 // .. but keep kernel thread id too for diagnostics
820 osthread->set_kernel_thread_id(kernel_thread_id);
821
822 // Initialize signal mask for this thread.
823 os::Aix::hotspot_sigmask(thread);
824
825 // Initialize floating point control register.
826 os::Aix::init_thread_fpu_state();
827
828 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
829
830 // Call one more level start routine.
831 thread->call_run();
832
833 // Note: at this point the thread object may already have deleted itself.
834 // Prevent dereferencing it from here on out.
835 thread = NULL;
836
837 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
838 os::current_thread_id(), (uintx) kernel_thread_id);
839
840 return 0;
841 }
842
843 bool os::create_thread(Thread* thread, ThreadType thr_type,
844 size_t req_stack_size) {
845
846 assert(thread->osthread() == NULL, "caller responsible");
847
848 // Allocate the OSThread object.
849 OSThread* osthread = new OSThread(NULL, NULL);
850 if (osthread == NULL) {
851 return false;
852 }
853
854 // Set the correct thread state.
855 osthread->set_thread_type(thr_type);
856
857 // Initial state is ALLOCATED but not INITIALIZED
858 osthread->set_state(ALLOCATED);
859
860 thread->set_osthread(osthread);
861
862 // Init thread attributes.
863 pthread_attr_t attr;
864 pthread_attr_init(&attr);
865 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
866
867 // Make sure we run in 1:1 kernel-user-thread mode.
868 if (os::Aix::on_aix()) {
869 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
870 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
871 }
872
873 // Start in suspended state, and in os::thread_start, wake the thread up.
874 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
875
876 // Calculate stack size if it's not specified by caller.
877 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
878
879 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
880 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
881 // This very much looks like a pthread lib error. As a workaround, increase the stack size
882 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
883 if (stack_size < 4096 * K) {
884 stack_size += 64 * K;
885 }
886
887 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
888 // thread size in attr unchanged. If this is the minimal stack size as set
889 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
890 // guard pages might not fit on the tiny stack created.
891 int ret = pthread_attr_setstacksize(&attr, stack_size);
892 if (ret != 0) {
893 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
894 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
895 stack_size / K);
896 thread->set_osthread(NULL);
897 delete osthread;
898 return false;
899 }
900
901 // Save some cycles and a page by disabling OS guard pages where we have our own
902 // VM guard pages (in java threads). For other threads, keep system default guard
903 // pages in place.
904 if (thr_type == java_thread || thr_type == compiler_thread) {
905 ret = pthread_attr_setguardsize(&attr, 0);
906 }
907
908 pthread_t tid = 0;
909 if (ret == 0) {
910 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
911 }
912
913 if (ret == 0) {
914 char buf[64];
915 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
916 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
917 } else {
918 char buf[64];
919 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
920 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
921 // Log some OS information which might explain why creating the thread failed.
922 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
923 LogStream st(Log(os, thread)::info());
924 os::Posix::print_rlimit_info(&st);
925 os::print_memory_info(&st);
926 }
927
928 pthread_attr_destroy(&attr);
929
930 if (ret != 0) {
931 // Need to clean up stuff we've allocated so far.
932 thread->set_osthread(NULL);
933 delete osthread;
934 return false;
935 }
936
937 // OSThread::thread_id is the pthread id.
938 osthread->set_thread_id(tid);
939
940 return true;
941 }
942
943 /////////////////////////////////////////////////////////////////////////////
944 // attach existing thread
945
946 // bootstrap the main thread
947 bool os::create_main_thread(JavaThread* thread) {
948 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
949 return create_attached_thread(thread);
950 }
951
952 bool os::create_attached_thread(JavaThread* thread) {
953 #ifdef ASSERT
954 thread->verify_not_published();
955 #endif
956
957 // Allocate the OSThread object
958 OSThread* osthread = new OSThread(NULL, NULL);
959
960 if (osthread == NULL) {
961 return false;
962 }
963
964 const pthread_t pthread_id = ::pthread_self();
965 const tid_t kernel_thread_id = ::thread_self();
966
967 // OSThread::thread_id is the pthread id.
968 osthread->set_thread_id(pthread_id);
969
970 // .. but keep kernel thread id too for diagnostics
971 osthread->set_kernel_thread_id(kernel_thread_id);
972
973 // initialize floating point control register
974 os::Aix::init_thread_fpu_state();
975
976 // Initial thread state is RUNNABLE
977 osthread->set_state(RUNNABLE);
978
979 thread->set_osthread(osthread);
980
981 if (UseNUMA) {
982 int lgrp_id = os::numa_get_group_id();
983 if (lgrp_id != -1) {
984 thread->set_lgrp_id(lgrp_id);
985 }
986 }
987
988 // initialize signal mask for this thread
989 // and save the caller's signal mask
990 os::Aix::hotspot_sigmask(thread);
991
992 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
993 os::current_thread_id(), (uintx) kernel_thread_id);
994
995 return true;
996 }
997
998 void os::pd_start_thread(Thread* thread) {
999 int status = pthread_continue_np(thread->osthread()->pthread_id());
1000 assert(status == 0, "thr_continue failed");
1001 }
1002
1003 // Free OS resources related to the OSThread
1004 void os::free_thread(OSThread* osthread) {
1005 assert(osthread != NULL, "osthread not set");
1006
1007 // We are told to free resources of the argument thread,
1008 // but we can only really operate on the current thread.
1009 assert(Thread::current()->osthread() == osthread,
1010 "os::free_thread but not current thread");
1011
1012 // Restore caller's signal mask
1013 sigset_t sigmask = osthread->caller_sigmask();
1014 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1015
1016 delete osthread;
1017 }
1018
1019 ////////////////////////////////////////////////////////////////////////////////
1020 // time support
1021
1022 // Time since start-up in seconds to a fine granularity.
1023 // Used by VMSelfDestructTimer and the MemProfiler.
1024 double os::elapsedTime() {
1025 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
1026 }
1027
1028 jlong os::elapsed_counter() {
1029 return javaTimeNanos() - initial_time_count;
1030 }
1031
1032 jlong os::elapsed_frequency() {
1033 return NANOSECS_PER_SEC; // nanosecond resolution
1034 }
1035
1036 bool os::supports_vtime() { return true; }
1037 bool os::enable_vtime() { return false; }
1038 bool os::vtime_enabled() { return false; }
1039
1040 double os::elapsedVTime() {
1041 struct rusage usage;
1042 int retval = getrusage(RUSAGE_THREAD, &usage);
1043 if (retval == 0) {
1044 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1045 } else {
1046 // better than nothing, but not much
1047 return elapsedTime();
1048 }
1049 }
1050
1051 jlong os::javaTimeMillis() {
1052 timeval time;
1053 int status = gettimeofday(&time, NULL);
1054 assert(status != -1, "aix error at gettimeofday()");
1055 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1056 }
1057
1058 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1059 timeval time;
1060 int status = gettimeofday(&time, NULL);
1061 assert(status != -1, "aix error at gettimeofday()");
1062 seconds = jlong(time.tv_sec);
1063 nanos = jlong(time.tv_usec) * 1000;
1064 }
1065
1066 // We use mread_real_time here.
1067 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1068 // it has to be converted to real time. AIX documentations suggests to do
1069 // this unconditionally, so we do it.
1070 //
1071 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1072 //
1073 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1074 // conversion is necessary. However, mread_real_time will not return
1075 // monotonic results but merely matches read_real_time. So we need a tweak
1076 // to ensure monotonic results.
1077 //
1078 // For PASE no public documentation exists, just word by IBM
1079 jlong os::javaTimeNanos() {
1080 timebasestruct_t time;
1081 int rc = mread_real_time(&time, TIMEBASE_SZ);
1082 if (os::Aix::on_pase()) {
1083 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1084 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1085 jlong prev = max_real_time;
1086 if (now <= prev) {
1087 return prev; // same or retrograde time;
1088 }
1089 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1090 assert(obsv >= prev, "invariant"); // Monotonicity
1091 // If the CAS succeeded then we're done and return "now".
1092 // If the CAS failed and the observed value "obsv" is >= now then
1093 // we should return "obsv". If the CAS failed and now > obsv > prv then
1094 // some other thread raced this thread and installed a new value, in which case
1095 // we could either (a) retry the entire operation, (b) retry trying to install now
1096 // or (c) just return obsv. We use (c). No loop is required although in some cases
1097 // we might discard a higher "now" value in deference to a slightly lower but freshly
1098 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1099 // to (a) or (b) -- and greatly reduces coherence traffic.
1100 // We might also condition (c) on the magnitude of the delta between obsv and now.
1101 // Avoiding excessive CAS operations to hot RW locations is critical.
1102 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1103 return (prev == obsv) ? now : obsv;
1104 } else {
1105 if (rc != RTC_POWER) {
1106 rc = time_base_to_time(&time, TIMEBASE_SZ);
1107 assert(rc != -1, "error calling time_base_to_time()");
1108 }
1109 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1110 }
1111 }
1112
1113 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1114 info_ptr->max_value = ALL_64_BITS;
1115 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1116 info_ptr->may_skip_backward = false;
1117 info_ptr->may_skip_forward = false;
1118 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1119 }
1120
1121 // Return the real, user, and system times in seconds from an
1122 // arbitrary fixed point in the past.
1123 bool os::getTimesSecs(double* process_real_time,
1124 double* process_user_time,
1125 double* process_system_time) {
1126 struct tms ticks;
1127 clock_t real_ticks = times(&ticks);
1128
1129 if (real_ticks == (clock_t) (-1)) {
1130 return false;
1131 } else {
1132 double ticks_per_second = (double) clock_tics_per_sec;
1133 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1134 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1135 *process_real_time = ((double) real_ticks) / ticks_per_second;
1136
1137 return true;
1138 }
1139 }
1140
1141 char * os::local_time_string(char *buf, size_t buflen) {
1142 struct tm t;
1143 time_t long_time;
1144 time(&long_time);
1145 localtime_r(&long_time, &t);
1146 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1147 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1148 t.tm_hour, t.tm_min, t.tm_sec);
1149 return buf;
1150 }
1151
1152 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1153 return localtime_r(clock, res);
1154 }
1155
1156 ////////////////////////////////////////////////////////////////////////////////
1157 // runtime exit support
1158
1159 // Note: os::shutdown() might be called very early during initialization, or
1160 // called from signal handler. Before adding something to os::shutdown(), make
1161 // sure it is async-safe and can handle partially initialized VM.
1162 void os::shutdown() {
1163
1164 // allow PerfMemory to attempt cleanup of any persistent resources
1165 perfMemory_exit();
1166
1167 // needs to remove object in file system
1168 AttachListener::abort();
1169
1170 // flush buffered output, finish log files
1171 ostream_abort();
1172
1173 // Check for abort hook
1174 abort_hook_t abort_hook = Arguments::abort_hook();
1175 if (abort_hook != NULL) {
1176 abort_hook();
1177 }
1178 }
1179
1180 // Note: os::abort() might be called very early during initialization, or
1181 // called from signal handler. Before adding something to os::abort(), make
1182 // sure it is async-safe and can handle partially initialized VM.
1183 void os::abort(bool dump_core, void* siginfo, const void* context) {
1184 os::shutdown();
1185 if (dump_core) {
1186 #ifndef PRODUCT
1187 fdStream out(defaultStream::output_fd());
1188 out.print_raw("Current thread is ");
1189 char buf[16];
1190 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1191 out.print_raw_cr(buf);
1192 out.print_raw_cr("Dumping core ...");
1193 #endif
1194 ::abort(); // dump core
1195 }
1196
1197 ::exit(1);
1198 }
1199
1200 // Die immediately, no exit hook, no abort hook, no cleanup.
1201 // Dump a core file, if possible, for debugging.
1202 void os::die() {
1203 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1204 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1205 // and don't take the time to generate a core file.
1206 os::signal_raise(SIGKILL);
1207 } else {
1208 ::abort();
1209 }
1210 }
1211
1212 intx os::current_thread_id() {
1213 return (intx)pthread_self();
1214 }
1215
1216 int os::current_process_id() {
1217 return getpid();
1218 }
1219
1220 // DLL functions
1221
1222 const char* os::dll_file_extension() { return ".so"; }
1223
1224 // This must be hard coded because it's the system's temporary
1225 // directory not the java application's temp directory, ala java.io.tmpdir.
1226 const char* os::get_temp_directory() { return "/tmp"; }
1227
1228 // Check if addr is inside libjvm.so.
1229 bool os::address_is_in_vm(address addr) {
1230
1231 // Input could be a real pc or a function pointer literal. The latter
1232 // would be a function descriptor residing in the data segment of a module.
1233 loaded_module_t lm;
1234 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1235 return lm.is_in_vm;
1236 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1237 return lm.is_in_vm;
1238 } else {
1239 return false;
1240 }
1241
1242 }
1243
1244 // Resolve an AIX function descriptor literal to a code pointer.
1245 // If the input is a valid code pointer to a text segment of a loaded module,
1246 // it is returned unchanged.
1247 // If the input is a valid AIX function descriptor, it is resolved to the
1248 // code entry point.
1249 // If the input is neither a valid function descriptor nor a valid code pointer,
1250 // NULL is returned.
1251 static address resolve_function_descriptor_to_code_pointer(address p) {
1252
1253 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1254 // It is a real code pointer.
1255 return p;
1256 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1257 // Pointer to data segment, potential function descriptor.
1258 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1259 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1260 // It is a function descriptor.
1261 return code_entry;
1262 }
1263 }
1264
1265 return NULL;
1266 }
1267
1268 bool os::dll_address_to_function_name(address addr, char *buf,
1269 int buflen, int *offset,
1270 bool demangle) {
1271 if (offset) {
1272 *offset = -1;
1273 }
1274 // Buf is not optional, but offset is optional.
1275 assert(buf != NULL, "sanity check");
1276 buf[0] = '\0';
1277
1278 // Resolve function ptr literals first.
1279 addr = resolve_function_descriptor_to_code_pointer(addr);
1280 if (!addr) {
1281 return false;
1282 }
1283
1284 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1285 }
1286
1287 bool os::dll_address_to_library_name(address addr, char* buf,
1288 int buflen, int* offset) {
1289 if (offset) {
1290 *offset = -1;
1291 }
1292 // Buf is not optional, but offset is optional.
1293 assert(buf != NULL, "sanity check");
1294 buf[0] = '\0';
1295
1296 // Resolve function ptr literals first.
1297 addr = resolve_function_descriptor_to_code_pointer(addr);
1298 if (!addr) {
1299 return false;
1300 }
1301
1302 return AixSymbols::get_module_name(addr, buf, buflen);
1303 }
1304
1305 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1306 // for the same architecture as Hotspot is running on.
1307 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1308
1309 log_info(os)("attempting shared library load of %s", filename);
1310
1311 if (ebuf && ebuflen > 0) {
1312 ebuf[0] = '\0';
1313 ebuf[ebuflen - 1] = '\0';
1314 }
1315
1316 if (!filename || strlen(filename) == 0) {
1317 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1318 return NULL;
1319 }
1320
1321 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1322 void * result= ::dlopen(filename, RTLD_LAZY);
1323 if (result != NULL) {
1324 Events::log(NULL, "Loaded shared library %s", filename);
1325 // Reload dll cache. Don't do this in signal handling.
1326 LoadedLibraries::reload();
1327 log_info(os)("shared library load of %s was successful", filename);
1328 return result;
1329 } else {
1330 // error analysis when dlopen fails
1331 const char* error_report = ::dlerror();
1332 if (error_report == NULL) {
1333 error_report = "dlerror returned no error description";
1334 }
1335 if (ebuf != NULL && ebuflen > 0) {
1336 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1337 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1338 }
1339 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1340 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1341 }
1342 return NULL;
1343 }
1344
1345 void* os::dll_lookup(void* handle, const char* name) {
1346 void* res = dlsym(handle, name);
1347 return res;
1348 }
1349
1350 void* os::get_default_process_handle() {
1351 return (void*)::dlopen(NULL, RTLD_LAZY);
1352 }
1353
1354 void os::print_dll_info(outputStream *st) {
1355 st->print_cr("Dynamic libraries:");
1356 LoadedLibraries::print(st);
1357 }
1358
1359 void os::get_summary_os_info(char* buf, size_t buflen) {
1360 // There might be something more readable than uname results for AIX.
1361 struct utsname name;
1362 uname(&name);
1363 snprintf(buf, buflen, "%s %s", name.release, name.version);
1364 }
1365
1366 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1367 // Not yet implemented.
1368 return 0;
1369 }
1370
1371 void os::print_os_info_brief(outputStream* st) {
1372 uint32_t ver = os::Aix::os_version();
1373 st->print_cr("AIX kernel version %u.%u.%u.%u",
1374 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1375
1376 os::Posix::print_uname_info(st);
1377
1378 // Linux uses print_libversion_info(st); here.
1379 }
1380
1381 void os::print_os_info(outputStream* st) {
1382 st->print("OS:");
1383
1384 os::Posix::print_uname_info(st);
1385
1386 uint32_t ver = os::Aix::os_version();
1387 st->print_cr("AIX kernel version %u.%u.%u.%u",
1388 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1389
1390 os::Posix::print_rlimit_info(st);
1391
1392 os::Posix::print_load_average(st);
1393
1394 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process.
1395 long tmax = sysconf(_SC_THREAD_THREADS_MAX);
1396 st->print_cr("maximum #threads within a process:%ld", tmax);
1397
1398 // print wpar info
1399 libperfstat::wparinfo_t wi;
1400 if (libperfstat::get_wparinfo(&wi)) {
1401 st->print_cr("wpar info");
1402 st->print_cr("name: %s", wi.name);
1403 st->print_cr("id: %d", wi.wpar_id);
1404 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1405 }
1406
1407 VM_Version::print_platform_virtualization_info(st);
1408 }
1409
1410 void os::print_memory_info(outputStream* st) {
1411
1412 st->print_cr("Memory:");
1413
1414 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1415 describe_pagesize(g_multipage_support.pagesize));
1416 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1417 describe_pagesize(g_multipage_support.datapsize));
1418 st->print_cr(" Text page size: %s",
1419 describe_pagesize(g_multipage_support.textpsize));
1420 st->print_cr(" Thread stack page size (pthread): %s",
1421 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1422 st->print_cr(" Default shared memory page size: %s",
1423 describe_pagesize(g_multipage_support.shmpsize));
1424 st->print_cr(" Can use 64K pages dynamically with shared memory: %s",
1425 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1426 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1427 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1428 st->print_cr(" Multipage error: %d",
1429 g_multipage_support.error);
1430 st->cr();
1431 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1432
1433 // print out LDR_CNTRL because it affects the default page sizes
1434 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1435 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1436
1437 // Print out EXTSHM because it is an unsupported setting.
1438 const char* const extshm = ::getenv("EXTSHM");
1439 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1440 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1441 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1442 }
1443
1444 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1445 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1446 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1447 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1448 st->cr();
1449
1450 os::Aix::meminfo_t mi;
1451 if (os::Aix::get_meminfo(&mi)) {
1452 if (os::Aix::on_aix()) {
1453 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1454 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1455 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1456 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1457 } else {
1458 // PASE - Numbers are result of QWCRSSTS; they mean:
1459 // real_total: Sum of all system pools
1460 // real_free: always 0
1461 // pgsp_total: we take the size of the system ASP
1462 // pgsp_free: size of system ASP times percentage of system ASP unused
1463 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1464 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1465 st->print_cr("%% system asp used : %.2f",
1466 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1467 }
1468 }
1469 st->cr();
1470
1471 // Print program break.
1472 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1473 address brk_now = (address)::sbrk(0);
1474 if (brk_now != (address)-1) {
1475 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1476 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1477 }
1478 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1479 st->cr();
1480
1481 // Print segments allocated with os::reserve_memory.
1482 st->print_cr("internal virtual memory regions used by vm:");
1483 vmembk_print_on(st);
1484 }
1485
1486 // Get a string for the cpuinfo that is a summary of the cpu type
1487 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1488 // read _system_configuration.version
1489 switch (_system_configuration.version) {
1490 case PV_9:
1491 strncpy(buf, "Power PC 9", buflen);
1492 break;
1493 case PV_8:
1494 strncpy(buf, "Power PC 8", buflen);
1495 break;
1496 case PV_7:
1497 strncpy(buf, "Power PC 7", buflen);
1498 break;
1499 case PV_6_1:
1500 strncpy(buf, "Power PC 6 DD1.x", buflen);
1501 break;
1502 case PV_6:
1503 strncpy(buf, "Power PC 6", buflen);
1504 break;
1505 case PV_5:
1506 strncpy(buf, "Power PC 5", buflen);
1507 break;
1508 case PV_5_2:
1509 strncpy(buf, "Power PC 5_2", buflen);
1510 break;
1511 case PV_5_3:
1512 strncpy(buf, "Power PC 5_3", buflen);
1513 break;
1514 case PV_5_Compat:
1515 strncpy(buf, "PV_5_Compat", buflen);
1516 break;
1517 case PV_6_Compat:
1518 strncpy(buf, "PV_6_Compat", buflen);
1519 break;
1520 case PV_7_Compat:
1521 strncpy(buf, "PV_7_Compat", buflen);
1522 break;
1523 case PV_8_Compat:
1524 strncpy(buf, "PV_8_Compat", buflen);
1525 break;
1526 case PV_9_Compat:
1527 strncpy(buf, "PV_9_Compat", buflen);
1528 break;
1529 default:
1530 strncpy(buf, "unknown", buflen);
1531 }
1532 }
1533
1534 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1535 // Nothing to do beyond of what os::print_cpu_info() does.
1536 }
1537
1538 static void print_signal_handler(outputStream* st, int sig,
1539 char* buf, size_t buflen);
1540
1541 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1542 st->print_cr("Signal Handlers:");
1543 print_signal_handler(st, SIGSEGV, buf, buflen);
1544 print_signal_handler(st, SIGBUS , buf, buflen);
1545 print_signal_handler(st, SIGFPE , buf, buflen);
1546 print_signal_handler(st, SIGPIPE, buf, buflen);
1547 print_signal_handler(st, SIGXFSZ, buf, buflen);
1548 print_signal_handler(st, SIGILL , buf, buflen);
1549 print_signal_handler(st, SR_signum, buf, buflen);
1550 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1551 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1552 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1553 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1554 print_signal_handler(st, SIGTRAP, buf, buflen);
1555 // We also want to know if someone else adds a SIGDANGER handler because
1556 // that will interfere with OOM killling.
1557 print_signal_handler(st, SIGDANGER, buf, buflen);
1558 }
1559
1560 static char saved_jvm_path[MAXPATHLEN] = {0};
1561
1562 // Find the full path to the current module, libjvm.so.
1563 void os::jvm_path(char *buf, jint buflen) {
1564 // Error checking.
1565 if (buflen < MAXPATHLEN) {
1566 assert(false, "must use a large-enough buffer");
1567 buf[0] = '\0';
1568 return;
1569 }
1570 // Lazy resolve the path to current module.
1571 if (saved_jvm_path[0] != 0) {
1572 strcpy(buf, saved_jvm_path);
1573 return;
1574 }
1575
1576 Dl_info dlinfo;
1577 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1578 assert(ret != 0, "cannot locate libjvm");
1579 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1580 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1581
1582 if (Arguments::sun_java_launcher_is_altjvm()) {
1583 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1584 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1585 // If "/jre/lib/" appears at the right place in the string, then
1586 // assume we are installed in a JDK and we're done. Otherwise, check
1587 // for a JAVA_HOME environment variable and fix up the path so it
1588 // looks like libjvm.so is installed there (append a fake suffix
1589 // hotspot/libjvm.so).
1590 const char *p = buf + strlen(buf) - 1;
1591 for (int count = 0; p > buf && count < 4; ++count) {
1592 for (--p; p > buf && *p != '/'; --p)
1593 /* empty */ ;
1594 }
1595
1596 if (strncmp(p, "/jre/lib/", 9) != 0) {
1597 // Look for JAVA_HOME in the environment.
1598 char* java_home_var = ::getenv("JAVA_HOME");
1599 if (java_home_var != NULL && java_home_var[0] != 0) {
1600 char* jrelib_p;
1601 int len;
1602
1603 // Check the current module name "libjvm.so".
1604 p = strrchr(buf, '/');
1605 if (p == NULL) {
1606 return;
1607 }
1608 assert(strstr(p, "/libjvm") == p, "invalid library name");
1609
1610 rp = os::Posix::realpath(java_home_var, buf, buflen);
1611 if (rp == NULL) {
1612 return;
1613 }
1614
1615 // determine if this is a legacy image or modules image
1616 // modules image doesn't have "jre" subdirectory
1617 len = strlen(buf);
1618 assert(len < buflen, "Ran out of buffer room");
1619 jrelib_p = buf + len;
1620 snprintf(jrelib_p, buflen-len, "/jre/lib");
1621 if (0 != access(buf, F_OK)) {
1622 snprintf(jrelib_p, buflen-len, "/lib");
1623 }
1624
1625 if (0 == access(buf, F_OK)) {
1626 // Use current module name "libjvm.so"
1627 len = strlen(buf);
1628 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1629 } else {
1630 // Go back to path of .so
1631 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1632 if (rp == NULL) {
1633 return;
1634 }
1635 }
1636 }
1637 }
1638 }
1639
1640 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1641 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1642 }
1643
1644 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1645 // no prefix required, not even "_"
1646 }
1647
1648 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1649 // no suffix required
1650 }
1651
1652 ////////////////////////////////////////////////////////////////////////////////
1653 // sun.misc.Signal support
1654
1655 static void
1656 UserHandler(int sig, void *siginfo, void *context) {
1657 // Ctrl-C is pressed during error reporting, likely because the error
1658 // handler fails to abort. Let VM die immediately.
1659 if (sig == SIGINT && VMError::is_error_reported()) {
1660 os::die();
1661 }
1662
1663 os::signal_notify(sig);
1664 }
1665
1666 void* os::user_handler() {
1667 return CAST_FROM_FN_PTR(void*, UserHandler);
1668 }
1669
1670 extern "C" {
1671 typedef void (*sa_handler_t)(int);
1672 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1673 }
1674
1675 void* os::signal(int signal_number, void* handler) {
1676 struct sigaction sigAct, oldSigAct;
1677
1678 sigfillset(&(sigAct.sa_mask));
1679
1680 // Do not block out synchronous signals in the signal handler.
1681 // Blocking synchronous signals only makes sense if you can really
1682 // be sure that those signals won't happen during signal handling,
1683 // when the blocking applies. Normal signal handlers are lean and
1684 // do not cause signals. But our signal handlers tend to be "risky"
1685 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1686 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1687 // by a SIGILL, which was blocked due to the signal mask. The process
1688 // just hung forever. Better to crash from a secondary signal than to hang.
1689 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1690 sigdelset(&(sigAct.sa_mask), SIGBUS);
1691 sigdelset(&(sigAct.sa_mask), SIGILL);
1692 sigdelset(&(sigAct.sa_mask), SIGFPE);
1693 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1694
1695 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1696
1697 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1698
1699 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1700 // -1 means registration failed
1701 return (void *)-1;
1702 }
1703
1704 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1705 }
1706
1707 void os::signal_raise(int signal_number) {
1708 ::raise(signal_number);
1709 }
1710
1711 //
1712 // The following code is moved from os.cpp for making this
1713 // code platform specific, which it is by its very nature.
1714 //
1715
1716 // Will be modified when max signal is changed to be dynamic
1717 int os::sigexitnum_pd() {
1718 return NSIG;
1719 }
1720
1721 // a counter for each possible signal value
1722 static volatile jint pending_signals[NSIG+1] = { 0 };
1723
1724 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1725 // On AIX, we use sem_init(), sem_post(), sem_wait()
1726 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1727 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1728 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1729 // on AIX, msem_..() calls are suspected of causing problems.
1730 static sem_t sig_sem;
1731 static msemaphore* p_sig_msem = 0;
1732
1733 static void local_sem_init() {
1734 if (os::Aix::on_aix()) {
1735 int rc = ::sem_init(&sig_sem, 0, 0);
1736 guarantee(rc != -1, "sem_init failed");
1737 } else {
1738 // Memory semaphores must live in shared mem.
1739 guarantee0(p_sig_msem == NULL);
1740 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1741 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1742 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1743 }
1744 }
1745
1746 static void local_sem_post() {
1747 static bool warn_only_once = false;
1748 if (os::Aix::on_aix()) {
1749 int rc = ::sem_post(&sig_sem);
1750 if (rc == -1 && !warn_only_once) {
1751 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1752 warn_only_once = true;
1753 }
1754 } else {
1755 guarantee0(p_sig_msem != NULL);
1756 int rc = ::msem_unlock(p_sig_msem, 0);
1757 if (rc == -1 && !warn_only_once) {
1758 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1759 warn_only_once = true;
1760 }
1761 }
1762 }
1763
1764 static void local_sem_wait() {
1765 static bool warn_only_once = false;
1766 if (os::Aix::on_aix()) {
1767 int rc = ::sem_wait(&sig_sem);
1768 if (rc == -1 && !warn_only_once) {
1769 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1770 warn_only_once = true;
1771 }
1772 } else {
1773 guarantee0(p_sig_msem != NULL); // must init before use
1774 int rc = ::msem_lock(p_sig_msem, 0);
1775 if (rc == -1 && !warn_only_once) {
1776 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1777 warn_only_once = true;
1778 }
1779 }
1780 }
1781
1782 static void jdk_misc_signal_init() {
1783 // Initialize signal structures
1784 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1785
1786 // Initialize signal semaphore
1787 local_sem_init();
1788 }
1789
1790 void os::signal_notify(int sig) {
1791 Atomic::inc(&pending_signals[sig]);
1792 local_sem_post();
1793 }
1794
1795 static int check_pending_signals() {
1796 for (;;) {
1797 for (int i = 0; i < NSIG + 1; i++) {
1798 jint n = pending_signals[i];
1799 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1800 return i;
1801 }
1802 }
1803 JavaThread *thread = JavaThread::current();
1804 ThreadBlockInVM tbivm(thread);
1805
1806 bool threadIsSuspended;
1807 do {
1808 thread->set_suspend_equivalent();
1809 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1810
1811 local_sem_wait();
1812
1813 // were we externally suspended while we were waiting?
1814 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1815 if (threadIsSuspended) {
1816 //
1817 // The semaphore has been incremented, but while we were waiting
1818 // another thread suspended us. We don't want to continue running
1819 // while suspended because that would surprise the thread that
1820 // suspended us.
1821 //
1822
1823 local_sem_post();
1824
1825 thread->java_suspend_self();
1826 }
1827 } while (threadIsSuspended);
1828 }
1829 }
1830
1831 int os::signal_wait() {
1832 return check_pending_signals();
1833 }
1834
1835 ////////////////////////////////////////////////////////////////////////////////
1836 // Virtual Memory
1837
1838 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1839
1840 #define VMEM_MAPPED 1
1841 #define VMEM_SHMATED 2
1842
1843 struct vmembk_t {
1844 int type; // 1 - mmap, 2 - shmat
1845 char* addr;
1846 size_t size; // Real size, may be larger than usersize.
1847 size_t pagesize; // page size of area
1848 vmembk_t* next;
1849
1850 bool contains_addr(char* p) const {
1851 return p >= addr && p < (addr + size);
1852 }
1853
1854 bool contains_range(char* p, size_t s) const {
1855 return contains_addr(p) && contains_addr(p + s - 1);
1856 }
1857
1858 void print_on(outputStream* os) const {
1859 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1860 " bytes, %d %s pages), %s",
1861 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1862 (type == VMEM_SHMATED ? "shmat" : "mmap")
1863 );
1864 }
1865
1866 // Check that range is a sub range of memory block (or equal to memory block);
1867 // also check that range is fully page aligned to the page size if the block.
1868 void assert_is_valid_subrange(char* p, size_t s) const {
1869 if (!contains_range(p, s)) {
1870 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1871 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1872 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size));
1873 guarantee0(false);
1874 }
1875 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1876 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1877 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize);
1878 guarantee0(false);
1879 }
1880 }
1881 };
1882
1883 static struct {
1884 vmembk_t* first;
1885 MiscUtils::CritSect cs;
1886 } vmem;
1887
1888 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1889 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1890 assert0(p);
1891 if (p) {
1892 MiscUtils::AutoCritSect lck(&vmem.cs);
1893 p->addr = addr; p->size = size;
1894 p->pagesize = pagesize;
1895 p->type = type;
1896 p->next = vmem.first;
1897 vmem.first = p;
1898 }
1899 }
1900
1901 static vmembk_t* vmembk_find(char* addr) {
1902 MiscUtils::AutoCritSect lck(&vmem.cs);
1903 for (vmembk_t* p = vmem.first; p; p = p->next) {
1904 if (p->addr <= addr && (p->addr + p->size) > addr) {
1905 return p;
1906 }
1907 }
1908 return NULL;
1909 }
1910
1911 static void vmembk_remove(vmembk_t* p0) {
1912 MiscUtils::AutoCritSect lck(&vmem.cs);
1913 assert0(p0);
1914 assert0(vmem.first); // List should not be empty.
1915 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1916 if (*pp == p0) {
1917 *pp = p0->next;
1918 ::free(p0);
1919 return;
1920 }
1921 }
1922 assert0(false); // Not found?
1923 }
1924
1925 static void vmembk_print_on(outputStream* os) {
1926 MiscUtils::AutoCritSect lck(&vmem.cs);
1927 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1928 vmi->print_on(os);
1929 os->cr();
1930 }
1931 }
1932
1933 // Reserve and attach a section of System V memory.
1934 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1935 // address. Failing that, it will attach the memory anywhere.
1936 // If <requested_addr> is NULL, function will attach the memory anywhere.
1937 //
1938 // <alignment_hint> is being ignored by this function. It is very probable however that the
1939 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1940 // Should this be not enogh, we can put more work into it.
1941 static char* reserve_shmated_memory (
1942 size_t bytes,
1943 char* requested_addr,
1944 size_t alignment_hint) {
1945
1946 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1947 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1948 bytes, p2i(requested_addr), alignment_hint);
1949
1950 // Either give me wish address or wish alignment but not both.
1951 assert0(!(requested_addr != NULL && alignment_hint != 0));
1952
1953 // We must prevent anyone from attaching too close to the
1954 // BRK because that may cause malloc OOM.
1955 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1956 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1957 "Will attach anywhere.", p2i(requested_addr));
1958 // Act like the OS refused to attach there.
1959 requested_addr = NULL;
1960 }
1961
1962 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1963 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1964 if (os::Aix::on_pase_V5R4_or_older()) {
1965 ShouldNotReachHere();
1966 }
1967
1968 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1969 const size_t size = align_up(bytes, 64*K);
1970
1971 // Reserve the shared segment.
1972 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1973 if (shmid == -1) {
1974 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1975 return NULL;
1976 }
1977
1978 // Important note:
1979 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1980 // We must right after attaching it remove it from the system. System V shm segments are global and
1981 // survive the process.
1982 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1983
1984 struct shmid_ds shmbuf;
1985 memset(&shmbuf, 0, sizeof(shmbuf));
1986 shmbuf.shm_pagesize = 64*K;
1987 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1988 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1989 size / (64*K), errno);
1990 // I want to know if this ever happens.
1991 assert(false, "failed to set page size for shmat");
1992 }
1993
1994 // Now attach the shared segment.
1995 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1996 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1997 // were not a segment boundary.
1998 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1999 const int errno_shmat = errno;
2000
2001 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2002 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2003 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2004 assert(false, "failed to remove shared memory segment!");
2005 }
2006
2007 // Handle shmat error. If we failed to attach, just return.
2008 if (addr == (char*)-1) {
2009 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat);
2010 return NULL;
2011 }
2012
2013 // Just for info: query the real page size. In case setting the page size did not
2014 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2015 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2016 if (real_pagesize != shmbuf.shm_pagesize) {
2017 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize);
2018 }
2019
2020 if (addr) {
2021 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2022 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize));
2023 } else {
2024 if (requested_addr != NULL) {
2025 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr));
2026 } else {
2027 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2028 }
2029 }
2030
2031 // book-keeping
2032 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2033 assert0(is_aligned_to(addr, os::vm_page_size()));
2034
2035 return addr;
2036 }
2037
2038 static bool release_shmated_memory(char* addr, size_t size) {
2039
2040 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2041 p2i(addr), p2i(addr + size - 1));
2042
2043 bool rc = false;
2044
2045 // TODO: is there a way to verify shm size without doing bookkeeping?
2046 if (::shmdt(addr) != 0) {
2047 trcVerbose("error (%d).", errno);
2048 } else {
2049 trcVerbose("ok.");
2050 rc = true;
2051 }
2052 return rc;
2053 }
2054
2055 static bool uncommit_shmated_memory(char* addr, size_t size) {
2056 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2057 p2i(addr), p2i(addr + size - 1));
2058
2059 const bool rc = my_disclaim64(addr, size);
2060
2061 if (!rc) {
2062 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size);
2063 return false;
2064 }
2065 return true;
2066 }
2067
2068 //////////////////////////////// mmap-based routines /////////////////////////////////
2069
2070 // Reserve memory via mmap.
2071 // If <requested_addr> is given, an attempt is made to attach at the given address.
2072 // Failing that, memory is allocated at any address.
2073 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2074 // allocate at an address aligned with the given alignment. Failing that, memory
2075 // is aligned anywhere.
2076 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2077 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2078 "alignment_hint " UINTX_FORMAT "...",
2079 bytes, p2i(requested_addr), alignment_hint);
2080
2081 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2082 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2083 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr));
2084 return NULL;
2085 }
2086
2087 // We must prevent anyone from attaching too close to the
2088 // BRK because that may cause malloc OOM.
2089 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2090 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2091 "Will attach anywhere.", p2i(requested_addr));
2092 // Act like the OS refused to attach there.
2093 requested_addr = NULL;
2094 }
2095
2096 // Specify one or the other but not both.
2097 assert0(!(requested_addr != NULL && alignment_hint > 0));
2098
2099 // In 64K mode, we claim the global page size (os::vm_page_size())
2100 // is 64K. This is one of the few points where that illusion may
2101 // break, because mmap() will always return memory aligned to 4K. So
2102 // we must ensure we only ever return memory aligned to 64k.
2103 if (alignment_hint) {
2104 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2105 } else {
2106 alignment_hint = os::vm_page_size();
2107 }
2108
2109 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2110 const size_t size = align_up(bytes, os::vm_page_size());
2111
2112 // alignment: Allocate memory large enough to include an aligned range of the right size and
2113 // cut off the leading and trailing waste pages.
2114 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2115 const size_t extra_size = size + alignment_hint;
2116
2117 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2118 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2119 int flags = MAP_ANONYMOUS | MAP_SHARED;
2120
2121 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2122 // it means if wishaddress is given but MAP_FIXED is not set.
2123 //
2124 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2125 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2126 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2127 // get clobbered.
2128 if (requested_addr != NULL) {
2129 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2130 flags |= MAP_FIXED;
2131 }
2132 }
2133
2134 char* addr = (char*)::mmap(requested_addr, extra_size,
2135 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2136
2137 if (addr == MAP_FAILED) {
2138 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno);
2139 return NULL;
2140 }
2141
2142 // Handle alignment.
2143 char* const addr_aligned = align_up(addr, alignment_hint);
2144 const size_t waste_pre = addr_aligned - addr;
2145 char* const addr_aligned_end = addr_aligned + size;
2146 const size_t waste_post = extra_size - waste_pre - size;
2147 if (waste_pre > 0) {
2148 ::munmap(addr, waste_pre);
2149 }
2150 if (waste_post > 0) {
2151 ::munmap(addr_aligned_end, waste_post);
2152 }
2153 addr = addr_aligned;
2154
2155 if (addr) {
2156 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2157 p2i(addr), p2i(addr + bytes), bytes);
2158 } else {
2159 if (requested_addr != NULL) {
2160 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr));
2161 } else {
2162 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2163 }
2164 }
2165
2166 // bookkeeping
2167 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2168
2169 // Test alignment, see above.
2170 assert0(is_aligned_to(addr, os::vm_page_size()));
2171
2172 return addr;
2173 }
2174
2175 static bool release_mmaped_memory(char* addr, size_t size) {
2176 assert0(is_aligned_to(addr, os::vm_page_size()));
2177 assert0(is_aligned_to(size, os::vm_page_size()));
2178
2179 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2180 p2i(addr), p2i(addr + size - 1));
2181 bool rc = false;
2182
2183 if (::munmap(addr, size) != 0) {
2184 trcVerbose("failed (%d)\n", errno);
2185 rc = false;
2186 } else {
2187 trcVerbose("ok.");
2188 rc = true;
2189 }
2190
2191 return rc;
2192 }
2193
2194 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2195
2196 assert0(is_aligned_to(addr, os::vm_page_size()));
2197 assert0(is_aligned_to(size, os::vm_page_size()));
2198
2199 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2200 p2i(addr), p2i(addr + size - 1));
2201 bool rc = false;
2202
2203 // Uncommit mmap memory with msync MS_INVALIDATE.
2204 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2205 trcVerbose("failed (%d)\n", errno);
2206 rc = false;
2207 } else {
2208 trcVerbose("ok.");
2209 rc = true;
2210 }
2211
2212 return rc;
2213 }
2214
2215 int os::vm_page_size() {
2216 // Seems redundant as all get out.
2217 assert(os::Aix::page_size() != -1, "must call os::init");
2218 return os::Aix::page_size();
2219 }
2220
2221 // Aix allocates memory by pages.
2222 int os::vm_allocation_granularity() {
2223 assert(os::Aix::page_size() != -1, "must call os::init");
2224 return os::Aix::page_size();
2225 }
2226
2227 #ifdef PRODUCT
2228 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2229 int err) {
2230 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2231 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec,
2232 os::errno_name(err), err);
2233 }
2234 #endif
2235
2236 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2237 const char* mesg) {
2238 assert(mesg != NULL, "mesg must be specified");
2239 if (!pd_commit_memory(addr, size, exec)) {
2240 // Add extra info in product mode for vm_exit_out_of_memory():
2241 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2242 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2243 }
2244 }
2245
2246 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2247
2248 assert(is_aligned_to(addr, os::vm_page_size()),
2249 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2250 p2i(addr), os::vm_page_size());
2251 assert(is_aligned_to(size, os::vm_page_size()),
2252 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2253 size, os::vm_page_size());
2254
2255 vmembk_t* const vmi = vmembk_find(addr);
2256 guarantee0(vmi);
2257 vmi->assert_is_valid_subrange(addr, size);
2258
2259 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1));
2260
2261 if (UseExplicitCommit) {
2262 // AIX commits memory on touch. So, touch all pages to be committed.
2263 for (char* p = addr; p < (addr + size); p += 4*K) {
2264 *p = '\0';
2265 }
2266 }
2267
2268 return true;
2269 }
2270
2271 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2272 return pd_commit_memory(addr, size, exec);
2273 }
2274
2275 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2276 size_t alignment_hint, bool exec,
2277 const char* mesg) {
2278 // Alignment_hint is ignored on this OS.
2279 pd_commit_memory_or_exit(addr, size, exec, mesg);
2280 }
2281
2282 bool os::pd_uncommit_memory(char* addr, size_t size) {
2283 assert(is_aligned_to(addr, os::vm_page_size()),
2284 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2285 p2i(addr), os::vm_page_size());
2286 assert(is_aligned_to(size, os::vm_page_size()),
2287 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2288 size, os::vm_page_size());
2289
2290 // Dynamically do different things for mmap/shmat.
2291 const vmembk_t* const vmi = vmembk_find(addr);
2292 guarantee0(vmi);
2293 vmi->assert_is_valid_subrange(addr, size);
2294
2295 if (vmi->type == VMEM_SHMATED) {
2296 return uncommit_shmated_memory(addr, size);
2297 } else {
2298 return uncommit_mmaped_memory(addr, size);
2299 }
2300 }
2301
2302 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2303 // Do not call this; no need to commit stack pages on AIX.
2304 ShouldNotReachHere();
2305 return true;
2306 }
2307
2308 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2309 // Do not call this; no need to commit stack pages on AIX.
2310 ShouldNotReachHere();
2311 return true;
2312 }
2313
2314 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2315 }
2316
2317 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2318 }
2319
2320 void os::numa_make_global(char *addr, size_t bytes) {
2321 }
2322
2323 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2324 }
2325
2326 bool os::numa_topology_changed() {
2327 return false;
2328 }
2329
2330 size_t os::numa_get_groups_num() {
2331 return 1;
2332 }
2333
2334 int os::numa_get_group_id() {
2335 return 0;
2336 }
2337
2338 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2339 if (size > 0) {
2340 ids[0] = 0;
2341 return 1;
2342 }
2343 return 0;
2344 }
2345
2346 bool os::get_page_info(char *start, page_info* info) {
2347 return false;
2348 }
2349
2350 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2351 return end;
2352 }
2353
2354 // Reserves and attaches a shared memory segment.
2355 // Will assert if a wish address is given and could not be obtained.
2356 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2357
2358 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2359 // thereby clobbering old mappings at that place. That is probably
2360 // not intended, never used and almost certainly an error were it
2361 // ever be used this way (to try attaching at a specified address
2362 // without clobbering old mappings an alternate API exists,
2363 // os::attempt_reserve_memory_at()).
2364 // Instead of mimicking the dangerous coding of the other platforms, here I
2365 // just ignore the request address (release) or assert(debug).
2366 assert0(requested_addr == NULL);
2367
2368 // Always round to os::vm_page_size(), which may be larger than 4K.
2369 bytes = align_up(bytes, os::vm_page_size());
2370 const size_t alignment_hint0 =
2371 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2372
2373 // In 4K mode always use mmap.
2374 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2375 if (os::vm_page_size() == 4*K) {
2376 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2377 } else {
2378 if (bytes >= Use64KPagesThreshold) {
2379 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2380 } else {
2381 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2382 }
2383 }
2384 }
2385
2386 bool os::pd_release_memory(char* addr, size_t size) {
2387
2388 // Dynamically do different things for mmap/shmat.
2389 vmembk_t* const vmi = vmembk_find(addr);
2390 guarantee0(vmi);
2391
2392 // Always round to os::vm_page_size(), which may be larger than 4K.
2393 size = align_up(size, os::vm_page_size());
2394 addr = align_up(addr, os::vm_page_size());
2395
2396 bool rc = false;
2397 bool remove_bookkeeping = false;
2398 if (vmi->type == VMEM_SHMATED) {
2399 // For shmatted memory, we do:
2400 // - If user wants to release the whole range, release the memory (shmdt).
2401 // - If user only wants to release a partial range, uncommit (disclaim) that
2402 // range. That way, at least, we do not use memory anymore (bust still page
2403 // table space).
2404 vmi->assert_is_valid_subrange(addr, size);
2405 if (addr == vmi->addr && size == vmi->size) {
2406 rc = release_shmated_memory(addr, size);
2407 remove_bookkeeping = true;
2408 } else {
2409 rc = uncommit_shmated_memory(addr, size);
2410 }
2411 } else {
2412 // User may unmap partial regions but region has to be fully contained.
2413 #ifdef ASSERT
2414 vmi->assert_is_valid_subrange(addr, size);
2415 #endif
2416 rc = release_mmaped_memory(addr, size);
2417 remove_bookkeeping = true;
2418 }
2419
2420 // update bookkeeping
2421 if (rc && remove_bookkeeping) {
2422 vmembk_remove(vmi);
2423 }
2424
2425 return rc;
2426 }
2427
2428 static bool checked_mprotect(char* addr, size_t size, int prot) {
2429
2430 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2431 // not tell me if protection failed when trying to protect an un-protectable range.
2432 //
2433 // This means if the memory was allocated using shmget/shmat, protection wont work
2434 // but mprotect will still return 0:
2435 //
2436 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2437
2438 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2439 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2440
2441 if (!rc) {
2442 const char* const s_errno = os::errno_name(errno);
2443 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2444 return false;
2445 }
2446
2447 // mprotect success check
2448 //
2449 // Mprotect said it changed the protection but can I believe it?
2450 //
2451 // To be sure I need to check the protection afterwards. Try to
2452 // read from protected memory and check whether that causes a segfault.
2453 //
2454 if (!os::Aix::xpg_sus_mode()) {
2455
2456 if (CanUseSafeFetch32()) {
2457
2458 const bool read_protected =
2459 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2460 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2461
2462 if (prot & PROT_READ) {
2463 rc = !read_protected;
2464 } else {
2465 rc = read_protected;
2466 }
2467
2468 if (!rc) {
2469 if (os::Aix::on_pase()) {
2470 // There is an issue on older PASE systems where mprotect() will return success but the
2471 // memory will not be protected.
2472 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2473 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2474 // a stack. It is an OS error.
2475 //
2476 // A valid strategy is just to try again. This usually works. :-/
2477
2478 ::usleep(1000);
2479 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2480 if (::mprotect(addr, size, prot) == 0) {
2481 const bool read_protected_2 =
2482 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2483 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2484 rc = true;
2485 }
2486 }
2487 }
2488 }
2489 }
2490
2491 assert(rc == true, "mprotect failed.");
2492
2493 return rc;
2494 }
2495
2496 // Set protections specified
2497 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2498 unsigned int p = 0;
2499 switch (prot) {
2500 case MEM_PROT_NONE: p = PROT_NONE; break;
2501 case MEM_PROT_READ: p = PROT_READ; break;
2502 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2503 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2504 default:
2505 ShouldNotReachHere();
2506 }
2507 // is_committed is unused.
2508 return checked_mprotect(addr, size, p);
2509 }
2510
2511 bool os::guard_memory(char* addr, size_t size) {
2512 return checked_mprotect(addr, size, PROT_NONE);
2513 }
2514
2515 bool os::unguard_memory(char* addr, size_t size) {
2516 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2517 }
2518
2519 // Large page support
2520
2521 static size_t _large_page_size = 0;
2522
2523 // Enable large page support if OS allows that.
2524 void os::large_page_init() {
2525 return; // Nothing to do. See query_multipage_support and friends.
2526 }
2527
2528 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2529 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2530 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2531 // so this is not needed.
2532 assert(false, "should not be called on AIX");
2533 return NULL;
2534 }
2535
2536 bool os::release_memory_special(char* base, size_t bytes) {
2537 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2538 Unimplemented();
2539 return false;
2540 }
2541
2542 size_t os::large_page_size() {
2543 return _large_page_size;
2544 }
2545
2546 bool os::can_commit_large_page_memory() {
2547 // Does not matter, we do not support huge pages.
2548 return false;
2549 }
2550
2551 bool os::can_execute_large_page_memory() {
2552 // Does not matter, we do not support huge pages.
2553 return false;
2554 }
2555
2556 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2557 assert(file_desc >= 0, "file_desc is not valid");
2558 char* result = NULL;
2559
2560 // Always round to os::vm_page_size(), which may be larger than 4K.
2561 bytes = align_up(bytes, os::vm_page_size());
2562 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2563
2564 if (result != NULL) {
2565 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2566 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2567 }
2568 }
2569 return result;
2570 }
2571
2572 // Reserve memory at an arbitrary address, only if that area is
2573 // available (and not reserved for something else).
2574 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2575 char* addr = NULL;
2576
2577 // Always round to os::vm_page_size(), which may be larger than 4K.
2578 bytes = align_up(bytes, os::vm_page_size());
2579
2580 // In 4K mode always use mmap.
2581 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2582 if (os::vm_page_size() == 4*K) {
2583 return reserve_mmaped_memory(bytes, requested_addr, 0);
2584 } else {
2585 if (bytes >= Use64KPagesThreshold) {
2586 return reserve_shmated_memory(bytes, requested_addr, 0);
2587 } else {
2588 return reserve_mmaped_memory(bytes, requested_addr, 0);
2589 }
2590 }
2591
2592 return addr;
2593 }
2594
2595 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2596 void os::infinite_sleep() {
2597 while (true) { // sleep forever ...
2598 ::sleep(100); // ... 100 seconds at a time
2599 }
2600 }
2601
2602 // Used to convert frequent JVM_Yield() to nops
2603 bool os::dont_yield() {
2604 return DontYieldALot;
2605 }
2606
2607 void os::naked_yield() {
2608 sched_yield();
2609 }
2610
2611 ////////////////////////////////////////////////////////////////////////////////
2612 // thread priority support
2613
2614 // From AIX manpage to pthread_setschedparam
2615 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2616 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2617 //
2618 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2619 // range from 40 to 80, where 40 is the least favored priority and 80
2620 // is the most favored."
2621 //
2622 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2623 // scheduling there; however, this still leaves iSeries.)
2624 //
2625 // We use the same values for AIX and PASE.
2626 int os::java_to_os_priority[CriticalPriority + 1] = {
2627 54, // 0 Entry should never be used
2628
2629 55, // 1 MinPriority
2630 55, // 2
2631 56, // 3
2632
2633 56, // 4
2634 57, // 5 NormPriority
2635 57, // 6
2636
2637 58, // 7
2638 58, // 8
2639 59, // 9 NearMaxPriority
2640
2641 60, // 10 MaxPriority
2642
2643 60 // 11 CriticalPriority
2644 };
2645
2646 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2647 if (!UseThreadPriorities) return OS_OK;
2648 pthread_t thr = thread->osthread()->pthread_id();
2649 int policy = SCHED_OTHER;
2650 struct sched_param param;
2651 param.sched_priority = newpri;
2652 int ret = pthread_setschedparam(thr, policy, ¶m);
2653
2654 if (ret != 0) {
2655 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2656 (int)thr, newpri, ret, os::errno_name(ret));
2657 }
2658 return (ret == 0) ? OS_OK : OS_ERR;
2659 }
2660
2661 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2662 if (!UseThreadPriorities) {
2663 *priority_ptr = java_to_os_priority[NormPriority];
2664 return OS_OK;
2665 }
2666 pthread_t thr = thread->osthread()->pthread_id();
2667 int policy = SCHED_OTHER;
2668 struct sched_param param;
2669 int ret = pthread_getschedparam(thr, &policy, ¶m);
2670 *priority_ptr = param.sched_priority;
2671
2672 return (ret == 0) ? OS_OK : OS_ERR;
2673 }
2674
2675 ////////////////////////////////////////////////////////////////////////////////
2676 // suspend/resume support
2677
2678 // The low-level signal-based suspend/resume support is a remnant from the
2679 // old VM-suspension that used to be for java-suspension, safepoints etc,
2680 // within hotspot. Currently used by JFR's OSThreadSampler
2681 //
2682 // The remaining code is greatly simplified from the more general suspension
2683 // code that used to be used.
2684 //
2685 // The protocol is quite simple:
2686 // - suspend:
2687 // - sends a signal to the target thread
2688 // - polls the suspend state of the osthread using a yield loop
2689 // - target thread signal handler (SR_handler) sets suspend state
2690 // and blocks in sigsuspend until continued
2691 // - resume:
2692 // - sets target osthread state to continue
2693 // - sends signal to end the sigsuspend loop in the SR_handler
2694 //
2695 // Note that the SR_lock plays no role in this suspend/resume protocol,
2696 // but is checked for NULL in SR_handler as a thread termination indicator.
2697 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2698 //
2699 // Note that resume_clear_context() and suspend_save_context() are needed
2700 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2701 // which in part is used by:
2702 // - Forte Analyzer: AsyncGetCallTrace()
2703 // - StackBanging: get_frame_at_stack_banging_point()
2704
2705 static void resume_clear_context(OSThread *osthread) {
2706 osthread->set_ucontext(NULL);
2707 osthread->set_siginfo(NULL);
2708 }
2709
2710 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2711 osthread->set_ucontext(context);
2712 osthread->set_siginfo(siginfo);
2713 }
2714
2715 //
2716 // Handler function invoked when a thread's execution is suspended or
2717 // resumed. We have to be careful that only async-safe functions are
2718 // called here (Note: most pthread functions are not async safe and
2719 // should be avoided.)
2720 //
2721 // Note: sigwait() is a more natural fit than sigsuspend() from an
2722 // interface point of view, but sigwait() prevents the signal hander
2723 // from being run. libpthread would get very confused by not having
2724 // its signal handlers run and prevents sigwait()'s use with the
2725 // mutex granting granting signal.
2726 //
2727 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2728 //
2729 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2730 // Save and restore errno to avoid confusing native code with EINTR
2731 // after sigsuspend.
2732 int old_errno = errno;
2733
2734 Thread* thread = Thread::current_or_null_safe();
2735 assert(thread != NULL, "Missing current thread in SR_handler");
2736
2737 // On some systems we have seen signal delivery get "stuck" until the signal
2738 // mask is changed as part of thread termination. Check that the current thread
2739 // has not already terminated (via SR_lock()) - else the following assertion
2740 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2741 // destructor has completed.
2742
2743 if (thread->SR_lock() == NULL) {
2744 return;
2745 }
2746
2747 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2748
2749 OSThread* osthread = thread->osthread();
2750
2751 os::SuspendResume::State current = osthread->sr.state();
2752 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2753 suspend_save_context(osthread, siginfo, context);
2754
2755 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2756 os::SuspendResume::State state = osthread->sr.suspended();
2757 if (state == os::SuspendResume::SR_SUSPENDED) {
2758 sigset_t suspend_set; // signals for sigsuspend()
2759 sigemptyset(&suspend_set);
2760 // get current set of blocked signals and unblock resume signal
2761 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2762 sigdelset(&suspend_set, SR_signum);
2763
2764 // wait here until we are resumed
2765 while (1) {
2766 sigsuspend(&suspend_set);
2767
2768 os::SuspendResume::State result = osthread->sr.running();
2769 if (result == os::SuspendResume::SR_RUNNING) {
2770 break;
2771 }
2772 }
2773
2774 } else if (state == os::SuspendResume::SR_RUNNING) {
2775 // request was cancelled, continue
2776 } else {
2777 ShouldNotReachHere();
2778 }
2779
2780 resume_clear_context(osthread);
2781 } else if (current == os::SuspendResume::SR_RUNNING) {
2782 // request was cancelled, continue
2783 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2784 // ignore
2785 } else {
2786 ShouldNotReachHere();
2787 }
2788
2789 errno = old_errno;
2790 }
2791
2792 static int SR_initialize() {
2793 struct sigaction act;
2794 char *s;
2795 // Get signal number to use for suspend/resume
2796 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2797 int sig = ::strtol(s, 0, 10);
2798 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2799 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2800 SR_signum = sig;
2801 } else {
2802 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2803 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2804 }
2805 }
2806
2807 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2808 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2809
2810 sigemptyset(&SR_sigset);
2811 sigaddset(&SR_sigset, SR_signum);
2812
2813 // Set up signal handler for suspend/resume.
2814 act.sa_flags = SA_RESTART|SA_SIGINFO;
2815 act.sa_handler = (void (*)(int)) SR_handler;
2816
2817 // SR_signum is blocked by default.
2818 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2819
2820 if (sigaction(SR_signum, &act, 0) == -1) {
2821 return -1;
2822 }
2823
2824 // Save signal flag
2825 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2826 return 0;
2827 }
2828
2829 static int SR_finalize() {
2830 return 0;
2831 }
2832
2833 static int sr_notify(OSThread* osthread) {
2834 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2835 assert_status(status == 0, status, "pthread_kill");
2836 return status;
2837 }
2838
2839 // "Randomly" selected value for how long we want to spin
2840 // before bailing out on suspending a thread, also how often
2841 // we send a signal to a thread we want to resume
2842 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2843 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2844
2845 // returns true on success and false on error - really an error is fatal
2846 // but this seems the normal response to library errors
2847 static bool do_suspend(OSThread* osthread) {
2848 assert(osthread->sr.is_running(), "thread should be running");
2849 // mark as suspended and send signal
2850
2851 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2852 // failed to switch, state wasn't running?
2853 ShouldNotReachHere();
2854 return false;
2855 }
2856
2857 if (sr_notify(osthread) != 0) {
2858 // try to cancel, switch to running
2859
2860 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2861 if (result == os::SuspendResume::SR_RUNNING) {
2862 // cancelled
2863 return false;
2864 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2865 // somehow managed to suspend
2866 return true;
2867 } else {
2868 ShouldNotReachHere();
2869 return false;
2870 }
2871 }
2872
2873 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2874
2875 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2876 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2877 os::naked_yield();
2878 }
2879
2880 // timeout, try to cancel the request
2881 if (n >= RANDOMLY_LARGE_INTEGER) {
2882 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2883 if (cancelled == os::SuspendResume::SR_RUNNING) {
2884 return false;
2885 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2886 return true;
2887 } else {
2888 ShouldNotReachHere();
2889 return false;
2890 }
2891 }
2892 }
2893
2894 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2895 return true;
2896 }
2897
2898 static void do_resume(OSThread* osthread) {
2899 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2900
2901 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2902 // failed to switch to WAKEUP_REQUEST
2903 ShouldNotReachHere();
2904 return;
2905 }
2906
2907 while (!osthread->sr.is_running()) {
2908 if (sr_notify(osthread) == 0) {
2909 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2910 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2911 os::naked_yield();
2912 }
2913 }
2914 } else {
2915 ShouldNotReachHere();
2916 }
2917 }
2918
2919 guarantee(osthread->sr.is_running(), "Must be running!");
2920 }
2921
2922 ///////////////////////////////////////////////////////////////////////////////////
2923 // signal handling (except suspend/resume)
2924
2925 // This routine may be used by user applications as a "hook" to catch signals.
2926 // The user-defined signal handler must pass unrecognized signals to this
2927 // routine, and if it returns true (non-zero), then the signal handler must
2928 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2929 // routine will never retun false (zero), but instead will execute a VM panic
2930 // routine kill the process.
2931 //
2932 // If this routine returns false, it is OK to call it again. This allows
2933 // the user-defined signal handler to perform checks either before or after
2934 // the VM performs its own checks. Naturally, the user code would be making
2935 // a serious error if it tried to handle an exception (such as a null check
2936 // or breakpoint) that the VM was generating for its own correct operation.
2937 //
2938 // This routine may recognize any of the following kinds of signals:
2939 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2940 // It should be consulted by handlers for any of those signals.
2941 //
2942 // The caller of this routine must pass in the three arguments supplied
2943 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2944 // field of the structure passed to sigaction(). This routine assumes that
2945 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2946 //
2947 // Note that the VM will print warnings if it detects conflicting signal
2948 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2949 //
2950 extern "C" JNIEXPORT int
2951 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2952
2953 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2954 // to be the thing to call; documentation is not terribly clear about whether
2955 // pthread_sigmask also works, and if it does, whether it does the same.
2956 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2957 const int rc = ::pthread_sigmask(how, set, oset);
2958 // return value semantics differ slightly for error case:
2959 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2960 // (so, pthread_sigmask is more theadsafe for error handling)
2961 // But success is always 0.
2962 return rc == 0 ? true : false;
2963 }
2964
2965 // Function to unblock all signals which are, according
2966 // to POSIX, typical program error signals. If they happen while being blocked,
2967 // they typically will bring down the process immediately.
2968 bool unblock_program_error_signals() {
2969 sigset_t set;
2970 ::sigemptyset(&set);
2971 ::sigaddset(&set, SIGILL);
2972 ::sigaddset(&set, SIGBUS);
2973 ::sigaddset(&set, SIGFPE);
2974 ::sigaddset(&set, SIGSEGV);
2975 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2976 }
2977
2978 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2979 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2980 assert(info != NULL && uc != NULL, "it must be old kernel");
2981
2982 // Never leave program error signals blocked;
2983 // on all our platforms they would bring down the process immediately when
2984 // getting raised while being blocked.
2985 unblock_program_error_signals();
2986
2987 int orig_errno = errno; // Preserve errno value over signal handler.
2988 JVM_handle_aix_signal(sig, info, uc, true);
2989 errno = orig_errno;
2990 }
2991
2992 // This boolean allows users to forward their own non-matching signals
2993 // to JVM_handle_aix_signal, harmlessly.
2994 bool os::Aix::signal_handlers_are_installed = false;
2995
2996 // For signal-chaining
2997 bool os::Aix::libjsig_is_loaded = false;
2998 typedef struct sigaction *(*get_signal_t)(int);
2999 get_signal_t os::Aix::get_signal_action = NULL;
3000
3001 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3002 struct sigaction *actp = NULL;
3003
3004 if (libjsig_is_loaded) {
3005 // Retrieve the old signal handler from libjsig
3006 actp = (*get_signal_action)(sig);
3007 }
3008 if (actp == NULL) {
3009 // Retrieve the preinstalled signal handler from jvm
3010 actp = os::Posix::get_preinstalled_handler(sig);
3011 }
3012
3013 return actp;
3014 }
3015
3016 static bool call_chained_handler(struct sigaction *actp, int sig,
3017 siginfo_t *siginfo, void *context) {
3018 // Call the old signal handler
3019 if (actp->sa_handler == SIG_DFL) {
3020 // It's more reasonable to let jvm treat it as an unexpected exception
3021 // instead of taking the default action.
3022 return false;
3023 } else if (actp->sa_handler != SIG_IGN) {
3024 if ((actp->sa_flags & SA_NODEFER) == 0) {
3025 // automaticlly block the signal
3026 sigaddset(&(actp->sa_mask), sig);
3027 }
3028
3029 sa_handler_t hand = NULL;
3030 sa_sigaction_t sa = NULL;
3031 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3032 // retrieve the chained handler
3033 if (siginfo_flag_set) {
3034 sa = actp->sa_sigaction;
3035 } else {
3036 hand = actp->sa_handler;
3037 }
3038
3039 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3040 actp->sa_handler = SIG_DFL;
3041 }
3042
3043 // try to honor the signal mask
3044 sigset_t oset;
3045 sigemptyset(&oset);
3046 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3047
3048 // call into the chained handler
3049 if (siginfo_flag_set) {
3050 (*sa)(sig, siginfo, context);
3051 } else {
3052 (*hand)(sig);
3053 }
3054
3055 // restore the signal mask
3056 pthread_sigmask(SIG_SETMASK, &oset, NULL);
3057 }
3058 // Tell jvm's signal handler the signal is taken care of.
3059 return true;
3060 }
3061
3062 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3063 bool chained = false;
3064 // signal-chaining
3065 if (UseSignalChaining) {
3066 struct sigaction *actp = get_chained_signal_action(sig);
3067 if (actp != NULL) {
3068 chained = call_chained_handler(actp, sig, siginfo, context);
3069 }
3070 }
3071 return chained;
3072 }
3073
3074 // for diagnostic
3075 int sigflags[NSIG];
3076
3077 int os::Aix::get_our_sigflags(int sig) {
3078 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3079 return sigflags[sig];
3080 }
3081
3082 void os::Aix::set_our_sigflags(int sig, int flags) {
3083 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3084 if (sig > 0 && sig < NSIG) {
3085 sigflags[sig] = flags;
3086 }
3087 }
3088
3089 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3090 // Check for overwrite.
3091 struct sigaction oldAct;
3092 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3093
3094 void* oldhand = oldAct.sa_sigaction
3095 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3096 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3097 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3098 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3099 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3100 if (AllowUserSignalHandlers || !set_installed) {
3101 // Do not overwrite; user takes responsibility to forward to us.
3102 return;
3103 } else if (UseSignalChaining) {
3104 // save the old handler in jvm
3105 os::Posix::save_preinstalled_handler(sig, oldAct);
3106 // libjsig also interposes the sigaction() call below and saves the
3107 // old sigaction on it own.
3108 } else {
3109 fatal("Encountered unexpected pre-existing sigaction handler "
3110 "%#lx for signal %d.", (long)oldhand, sig);
3111 }
3112 }
3113
3114 struct sigaction sigAct;
3115 sigfillset(&(sigAct.sa_mask));
3116 if (!set_installed) {
3117 sigAct.sa_handler = SIG_DFL;
3118 sigAct.sa_flags = SA_RESTART;
3119 } else {
3120 sigAct.sa_sigaction = javaSignalHandler;
3121 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3122 }
3123 // Save flags, which are set by ours
3124 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3125 sigflags[sig] = sigAct.sa_flags;
3126
3127 int ret = sigaction(sig, &sigAct, &oldAct);
3128 assert(ret == 0, "check");
3129
3130 void* oldhand2 = oldAct.sa_sigaction
3131 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3132 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3133 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3134 }
3135
3136 // install signal handlers for signals that HotSpot needs to
3137 // handle in order to support Java-level exception handling.
3138 void os::Aix::install_signal_handlers() {
3139 if (!signal_handlers_are_installed) {
3140 signal_handlers_are_installed = true;
3141
3142 // signal-chaining
3143 typedef void (*signal_setting_t)();
3144 signal_setting_t begin_signal_setting = NULL;
3145 signal_setting_t end_signal_setting = NULL;
3146 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3147 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3148 if (begin_signal_setting != NULL) {
3149 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3150 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3151 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3152 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3153 libjsig_is_loaded = true;
3154 assert(UseSignalChaining, "should enable signal-chaining");
3155 }
3156 if (libjsig_is_loaded) {
3157 // Tell libjsig jvm is setting signal handlers.
3158 (*begin_signal_setting)();
3159 }
3160
3161 set_signal_handler(SIGSEGV, true);
3162 set_signal_handler(SIGPIPE, true);
3163 set_signal_handler(SIGBUS, true);
3164 set_signal_handler(SIGILL, true);
3165 set_signal_handler(SIGFPE, true);
3166 set_signal_handler(SIGTRAP, true);
3167 set_signal_handler(SIGXFSZ, true);
3168
3169 if (libjsig_is_loaded) {
3170 // Tell libjsig jvm finishes setting signal handlers.
3171 (*end_signal_setting)();
3172 }
3173
3174 // We don't activate signal checker if libjsig is in place, we trust ourselves
3175 // and if UserSignalHandler is installed all bets are off.
3176 // Log that signal checking is off only if -verbose:jni is specified.
3177 if (CheckJNICalls) {
3178 if (libjsig_is_loaded) {
3179 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3180 check_signals = false;
3181 }
3182 if (AllowUserSignalHandlers) {
3183 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3184 check_signals = false;
3185 }
3186 // Need to initialize check_signal_done.
3187 ::sigemptyset(&check_signal_done);
3188 }
3189 }
3190 }
3191
3192 static const char* get_signal_handler_name(address handler,
3193 char* buf, int buflen) {
3194 int offset;
3195 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3196 if (found) {
3197 // skip directory names
3198 const char *p1, *p2;
3199 p1 = buf;
3200 size_t len = strlen(os::file_separator());
3201 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3202 // The way os::dll_address_to_library_name is implemented on Aix
3203 // right now, it always returns -1 for the offset which is not
3204 // terribly informative.
3205 // Will fix that. For now, omit the offset.
3206 jio_snprintf(buf, buflen, "%s", p1);
3207 } else {
3208 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3209 }
3210 return buf;
3211 }
3212
3213 static void print_signal_handler(outputStream* st, int sig,
3214 char* buf, size_t buflen) {
3215 struct sigaction sa;
3216 sigaction(sig, NULL, &sa);
3217
3218 st->print("%s: ", os::exception_name(sig, buf, buflen));
3219
3220 address handler = (sa.sa_flags & SA_SIGINFO)
3221 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3222 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3223
3224 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3225 st->print("SIG_DFL");
3226 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3227 st->print("SIG_IGN");
3228 } else {
3229 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3230 }
3231
3232 // Print readable mask.
3233 st->print(", sa_mask[0]=");
3234 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3235
3236 address rh = VMError::get_resetted_sighandler(sig);
3237 // May be, handler was resetted by VMError?
3238 if (rh != NULL) {
3239 handler = rh;
3240 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3241 }
3242
3243 // Print textual representation of sa_flags.
3244 st->print(", sa_flags=");
3245 os::Posix::print_sa_flags(st, sa.sa_flags);
3246
3247 // Check: is it our handler?
3248 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3249 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3250 // It is our signal handler.
3251 // Check for flags, reset system-used one!
3252 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3253 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3254 os::Aix::get_our_sigflags(sig));
3255 }
3256 }
3257 st->cr();
3258 }
3259
3260 #define DO_SIGNAL_CHECK(sig) \
3261 if (!sigismember(&check_signal_done, sig)) \
3262 os::Aix::check_signal_handler(sig)
3263
3264 // This method is a periodic task to check for misbehaving JNI applications
3265 // under CheckJNI, we can add any periodic checks here
3266
3267 void os::run_periodic_checks() {
3268
3269 if (check_signals == false) return;
3270
3271 // SEGV and BUS if overridden could potentially prevent
3272 // generation of hs*.log in the event of a crash, debugging
3273 // such a case can be very challenging, so we absolutely
3274 // check the following for a good measure:
3275 DO_SIGNAL_CHECK(SIGSEGV);
3276 DO_SIGNAL_CHECK(SIGILL);
3277 DO_SIGNAL_CHECK(SIGFPE);
3278 DO_SIGNAL_CHECK(SIGBUS);
3279 DO_SIGNAL_CHECK(SIGPIPE);
3280 DO_SIGNAL_CHECK(SIGXFSZ);
3281 if (UseSIGTRAP) {
3282 DO_SIGNAL_CHECK(SIGTRAP);
3283 }
3284
3285 // ReduceSignalUsage allows the user to override these handlers
3286 // see comments at the very top and jvm_md.h
3287 if (!ReduceSignalUsage) {
3288 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3289 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3290 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3291 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3292 }
3293
3294 DO_SIGNAL_CHECK(SR_signum);
3295 }
3296
3297 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3298
3299 static os_sigaction_t os_sigaction = NULL;
3300
3301 void os::Aix::check_signal_handler(int sig) {
3302 char buf[O_BUFLEN];
3303 address jvmHandler = NULL;
3304
3305 struct sigaction act;
3306 if (os_sigaction == NULL) {
3307 // only trust the default sigaction, in case it has been interposed
3308 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3309 if (os_sigaction == NULL) return;
3310 }
3311
3312 os_sigaction(sig, (struct sigaction*)NULL, &act);
3313
3314 address thisHandler = (act.sa_flags & SA_SIGINFO)
3315 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3316 : CAST_FROM_FN_PTR(address, act.sa_handler);
3317
3318 switch(sig) {
3319 case SIGSEGV:
3320 case SIGBUS:
3321 case SIGFPE:
3322 case SIGPIPE:
3323 case SIGILL:
3324 case SIGXFSZ:
3325 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3326 break;
3327
3328 case SHUTDOWN1_SIGNAL:
3329 case SHUTDOWN2_SIGNAL:
3330 case SHUTDOWN3_SIGNAL:
3331 case BREAK_SIGNAL:
3332 jvmHandler = (address)user_handler();
3333 break;
3334
3335 default:
3336 if (sig == SR_signum) {
3337 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3338 } else {
3339 return;
3340 }
3341 break;
3342 }
3343
3344 if (thisHandler != jvmHandler) {
3345 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3346 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3347 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3348 // No need to check this sig any longer
3349 sigaddset(&check_signal_done, sig);
3350 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3351 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3352 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3353 exception_name(sig, buf, O_BUFLEN));
3354 }
3355 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3356 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3357 tty->print("expected:");
3358 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3359 tty->cr();
3360 tty->print(" found:");
3361 os::Posix::print_sa_flags(tty, act.sa_flags);
3362 tty->cr();
3363 // No need to check this sig any longer
3364 sigaddset(&check_signal_done, sig);
3365 }
3366
3367 // Dump all the signal
3368 if (sigismember(&check_signal_done, sig)) {
3369 print_signal_handlers(tty, buf, O_BUFLEN);
3370 }
3371 }
3372
3373 // To install functions for atexit system call
3374 extern "C" {
3375 static void perfMemory_exit_helper() {
3376 perfMemory_exit();
3377 }
3378 }
3379
3380 // This is called _before_ the most of global arguments have been parsed.
3381 void os::init(void) {
3382 // This is basic, we want to know if that ever changes.
3383 // (Shared memory boundary is supposed to be a 256M aligned.)
3384 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3385
3386 // Record process break at startup.
3387 g_brk_at_startup = (address) ::sbrk(0);
3388 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3389
3390 // First off, we need to know whether we run on AIX or PASE, and
3391 // the OS level we run on.
3392 os::Aix::initialize_os_info();
3393
3394 // Scan environment (SPEC1170 behaviour, etc).
3395 os::Aix::scan_environment();
3396
3397 // Probe multipage support.
3398 query_multipage_support();
3399
3400 // Act like we only have one page size by eliminating corner cases which
3401 // we did not support very well anyway.
3402 // We have two input conditions:
3403 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3404 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3405 // setting.
3406 // Data segment page size is important for us because it defines the thread stack page
3407 // size, which is needed for guard page handling, stack banging etc.
3408 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3409 // and should be allocated with 64k pages.
3410 //
3411 // So, we do the following:
3412 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3413 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3414 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3415 // 64k no --- AIX 5.2 ? ---
3416 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3417
3418 // We explicitly leave no option to change page size, because only upgrading would work,
3419 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3420
3421 if (g_multipage_support.datapsize == 4*K) {
3422 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3423 if (g_multipage_support.can_use_64K_pages) {
3424 // .. but we are able to use 64K pages dynamically.
3425 // This would be typical for java launchers which are not linked
3426 // with datapsize=64K (like, any other launcher but our own).
3427 //
3428 // In this case it would be smart to allocate the java heap with 64K
3429 // to get the performance benefit, and to fake 64k pages for the
3430 // data segment (when dealing with thread stacks).
3431 //
3432 // However, leave a possibility to downgrade to 4K, using
3433 // -XX:-Use64KPages.
3434 if (Use64KPages) {
3435 trcVerbose("64K page mode (faked for data segment)");
3436 Aix::_page_size = 64*K;
3437 } else {
3438 trcVerbose("4K page mode (Use64KPages=off)");
3439 Aix::_page_size = 4*K;
3440 }
3441 } else {
3442 // .. and not able to allocate 64k pages dynamically. Here, just
3443 // fall back to 4K paged mode and use mmap for everything.
3444 trcVerbose("4K page mode");
3445 Aix::_page_size = 4*K;
3446 FLAG_SET_ERGO(Use64KPages, false);
3447 }
3448 } else {
3449 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3450 // This normally means that we can allocate 64k pages dynamically.
3451 // (There is one special case where this may be false: EXTSHM=on.
3452 // but we decided to not support that mode).
3453 assert0(g_multipage_support.can_use_64K_pages);
3454 Aix::_page_size = 64*K;
3455 trcVerbose("64K page mode");
3456 FLAG_SET_ERGO(Use64KPages, true);
3457 }
3458
3459 // For now UseLargePages is just ignored.
3460 FLAG_SET_ERGO(UseLargePages, false);
3461 _page_sizes[0] = 0;
3462
3463 // debug trace
3464 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3465
3466 // Next, we need to initialize libo4 and libperfstat libraries.
3467 if (os::Aix::on_pase()) {
3468 os::Aix::initialize_libo4();
3469 } else {
3470 os::Aix::initialize_libperfstat();
3471 }
3472
3473 // Reset the perfstat information provided by ODM.
3474 if (os::Aix::on_aix()) {
3475 libperfstat::perfstat_reset();
3476 }
3477
3478 // Now initialze basic system properties. Note that for some of the values we
3479 // need libperfstat etc.
3480 os::Aix::initialize_system_info();
3481
3482 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3483
3484 init_random(1234567);
3485
3486 // _main_thread points to the thread that created/loaded the JVM.
3487 Aix::_main_thread = pthread_self();
3488
3489 initial_time_count = javaTimeNanos();
3490
3491 os::Posix::init();
3492 }
3493
3494 // This is called _after_ the global arguments have been parsed.
3495 jint os::init_2(void) {
3496
3497 // This could be set after os::Posix::init() but all platforms
3498 // have to set it the same so we have to mirror Solaris.
3499 DEBUG_ONLY(os::set_mutex_init_done();)
3500
3501 os::Posix::init_2();
3502
3503 if (os::Aix::on_pase()) {
3504 trcVerbose("Running on PASE.");
3505 } else {
3506 trcVerbose("Running on AIX (not PASE).");
3507 }
3508
3509 trcVerbose("processor count: %d", os::_processor_count);
3510 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3511
3512 // Initially build up the loaded dll map.
3513 LoadedLibraries::reload();
3514 if (Verbose) {
3515 trcVerbose("Loaded Libraries: ");
3516 LoadedLibraries::print(tty);
3517 }
3518
3519 // initialize suspend/resume support - must do this before signal_sets_init()
3520 if (SR_initialize() != 0) {
3521 perror("SR_initialize failed");
3522 return JNI_ERR;
3523 }
3524
3525 Aix::signal_sets_init();
3526 Aix::install_signal_handlers();
3527 // Initialize data for jdk.internal.misc.Signal
3528 if (!ReduceSignalUsage) {
3529 jdk_misc_signal_init();
3530 }
3531
3532 // Check and sets minimum stack sizes against command line options
3533 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3534 return JNI_ERR;
3535 }
3536
3537 if (UseNUMA) {
3538 UseNUMA = false;
3539 warning("NUMA optimizations are not available on this OS.");
3540 }
3541
3542 if (MaxFDLimit) {
3543 // Set the number of file descriptors to max. print out error
3544 // if getrlimit/setrlimit fails but continue regardless.
3545 struct rlimit nbr_files;
3546 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3547 if (status != 0) {
3548 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3549 } else {
3550 nbr_files.rlim_cur = nbr_files.rlim_max;
3551 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3552 if (status != 0) {
3553 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3554 }
3555 }
3556 }
3557
3558 if (PerfAllowAtExitRegistration) {
3559 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3560 // At exit functions can be delayed until process exit time, which
3561 // can be problematic for embedded VM situations. Embedded VMs should
3562 // call DestroyJavaVM() to assure that VM resources are released.
3563
3564 // Note: perfMemory_exit_helper atexit function may be removed in
3565 // the future if the appropriate cleanup code can be added to the
3566 // VM_Exit VMOperation's doit method.
3567 if (atexit(perfMemory_exit_helper) != 0) {
3568 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3569 }
3570 }
3571
3572 return JNI_OK;
3573 }
3574
3575 // Mark the polling page as unreadable
3576 void os::make_polling_page_unreadable(void) {
3577 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3578 fatal("Could not disable polling page");
3579 }
3580 };
3581
3582 // Mark the polling page as readable
3583 void os::make_polling_page_readable(void) {
3584 // Changed according to os_linux.cpp.
3585 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3586 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3587 }
3588 };
3589
3590 int os::active_processor_count() {
3591 // User has overridden the number of active processors
3592 if (ActiveProcessorCount > 0) {
3593 log_trace(os)("active_processor_count: "
3594 "active processor count set by user : %d",
3595 ActiveProcessorCount);
3596 return ActiveProcessorCount;
3597 }
3598
3599 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3600 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3601 return online_cpus;
3602 }
3603
3604 void os::set_native_thread_name(const char *name) {
3605 // Not yet implemented.
3606 return;
3607 }
3608
3609 bool os::distribute_processes(uint length, uint* distribution) {
3610 // Not yet implemented.
3611 return false;
3612 }
3613
3614 bool os::bind_to_processor(uint processor_id) {
3615 // Not yet implemented.
3616 return false;
3617 }
3618
3619 void os::SuspendedThreadTask::internal_do_task() {
3620 if (do_suspend(_thread->osthread())) {
3621 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3622 do_task(context);
3623 do_resume(_thread->osthread());
3624 }
3625 }
3626
3627 ////////////////////////////////////////////////////////////////////////////////
3628 // debug support
3629
3630 bool os::find(address addr, outputStream* st) {
3631
3632 st->print(PTR_FORMAT ": ", addr);
3633
3634 loaded_module_t lm;
3635 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3636 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3637 st->print_cr("%s", lm.path);
3638 return true;
3639 }
3640
3641 return false;
3642 }
3643
3644 ////////////////////////////////////////////////////////////////////////////////
3645 // misc
3646
3647 // This does not do anything on Aix. This is basically a hook for being
3648 // able to use structured exception handling (thread-local exception filters)
3649 // on, e.g., Win32.
3650 void
3651 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3652 JavaCallArguments* args, Thread* thread) {
3653 f(value, method, args, thread);
3654 }
3655
3656 void os::print_statistics() {
3657 }
3658
3659 bool os::message_box(const char* title, const char* message) {
3660 int i;
3661 fdStream err(defaultStream::error_fd());
3662 for (i = 0; i < 78; i++) err.print_raw("=");
3663 err.cr();
3664 err.print_raw_cr(title);
3665 for (i = 0; i < 78; i++) err.print_raw("-");
3666 err.cr();
3667 err.print_raw_cr(message);
3668 for (i = 0; i < 78; i++) err.print_raw("=");
3669 err.cr();
3670
3671 char buf[16];
3672 // Prevent process from exiting upon "read error" without consuming all CPU
3673 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3674
3675 return buf[0] == 'y' || buf[0] == 'Y';
3676 }
3677
3678 // Is a (classpath) directory empty?
3679 bool os::dir_is_empty(const char* path) {
3680 DIR *dir = NULL;
3681 struct dirent *ptr;
3682
3683 dir = opendir(path);
3684 if (dir == NULL) return true;
3685
3686 /* Scan the directory */
3687 bool result = true;
3688 while (result && (ptr = readdir(dir)) != NULL) {
3689 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3690 result = false;
3691 }
3692 }
3693 closedir(dir);
3694 return result;
3695 }
3696
3697 // This code originates from JDK's sysOpen and open64_w
3698 // from src/solaris/hpi/src/system_md.c
3699
3700 int os::open(const char *path, int oflag, int mode) {
3701
3702 if (strlen(path) > MAX_PATH - 1) {
3703 errno = ENAMETOOLONG;
3704 return -1;
3705 }
3706 int fd;
3707
3708 fd = ::open64(path, oflag, mode);
3709 if (fd == -1) return -1;
3710
3711 // If the open succeeded, the file might still be a directory.
3712 {
3713 struct stat64 buf64;
3714 int ret = ::fstat64(fd, &buf64);
3715 int st_mode = buf64.st_mode;
3716
3717 if (ret != -1) {
3718 if ((st_mode & S_IFMT) == S_IFDIR) {
3719 errno = EISDIR;
3720 ::close(fd);
3721 return -1;
3722 }
3723 } else {
3724 ::close(fd);
3725 return -1;
3726 }
3727 }
3728
3729 // All file descriptors that are opened in the JVM and not
3730 // specifically destined for a subprocess should have the
3731 // close-on-exec flag set. If we don't set it, then careless 3rd
3732 // party native code might fork and exec without closing all
3733 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3734 // UNIXProcess.c), and this in turn might:
3735 //
3736 // - cause end-of-file to fail to be detected on some file
3737 // descriptors, resulting in mysterious hangs, or
3738 //
3739 // - might cause an fopen in the subprocess to fail on a system
3740 // suffering from bug 1085341.
3741 //
3742 // (Yes, the default setting of the close-on-exec flag is a Unix
3743 // design flaw.)
3744 //
3745 // See:
3746 // 1085341: 32-bit stdio routines should support file descriptors >255
3747 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3748 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3749 #ifdef FD_CLOEXEC
3750 {
3751 int flags = ::fcntl(fd, F_GETFD);
3752 if (flags != -1)
3753 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3754 }
3755 #endif
3756
3757 return fd;
3758 }
3759
3760 // create binary file, rewriting existing file if required
3761 int os::create_binary_file(const char* path, bool rewrite_existing) {
3762 int oflags = O_WRONLY | O_CREAT;
3763 if (!rewrite_existing) {
3764 oflags |= O_EXCL;
3765 }
3766 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3767 }
3768
3769 // return current position of file pointer
3770 jlong os::current_file_offset(int fd) {
3771 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3772 }
3773
3774 // move file pointer to the specified offset
3775 jlong os::seek_to_file_offset(int fd, jlong offset) {
3776 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3777 }
3778
3779 // This code originates from JDK's sysAvailable
3780 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3781
3782 int os::available(int fd, jlong *bytes) {
3783 jlong cur, end;
3784 int mode;
3785 struct stat64 buf64;
3786
3787 if (::fstat64(fd, &buf64) >= 0) {
3788 mode = buf64.st_mode;
3789 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3790 int n;
3791 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3792 *bytes = n;
3793 return 1;
3794 }
3795 }
3796 }
3797 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3798 return 0;
3799 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3800 return 0;
3801 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3802 return 0;
3803 }
3804 *bytes = end - cur;
3805 return 1;
3806 }
3807
3808 // Map a block of memory.
3809 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3810 char *addr, size_t bytes, bool read_only,
3811 bool allow_exec) {
3812 int prot;
3813 int flags = MAP_PRIVATE;
3814
3815 if (read_only) {
3816 prot = PROT_READ;
3817 flags = MAP_SHARED;
3818 } else {
3819 prot = PROT_READ | PROT_WRITE;
3820 flags = MAP_PRIVATE;
3821 }
3822
3823 if (allow_exec) {
3824 prot |= PROT_EXEC;
3825 }
3826
3827 if (addr != NULL) {
3828 flags |= MAP_FIXED;
3829 }
3830
3831 // Allow anonymous mappings if 'fd' is -1.
3832 if (fd == -1) {
3833 flags |= MAP_ANONYMOUS;
3834 }
3835
3836 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3837 fd, file_offset);
3838 if (mapped_address == MAP_FAILED) {
3839 return NULL;
3840 }
3841 return mapped_address;
3842 }
3843
3844 // Remap a block of memory.
3845 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3846 char *addr, size_t bytes, bool read_only,
3847 bool allow_exec) {
3848 // same as map_memory() on this OS
3849 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3850 allow_exec);
3851 }
3852
3853 // Unmap a block of memory.
3854 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3855 return munmap(addr, bytes) == 0;
3856 }
3857
3858 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3859 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3860 // of a thread.
3861 //
3862 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3863 // the fast estimate available on the platform.
3864
3865 jlong os::current_thread_cpu_time() {
3866 // return user + sys since the cost is the same
3867 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3868 assert(n >= 0, "negative CPU time");
3869 return n;
3870 }
3871
3872 jlong os::thread_cpu_time(Thread* thread) {
3873 // consistent with what current_thread_cpu_time() returns
3874 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3875 assert(n >= 0, "negative CPU time");
3876 return n;
3877 }
3878
3879 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3880 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3881 assert(n >= 0, "negative CPU time");
3882 return n;
3883 }
3884
3885 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3886 bool error = false;
3887
3888 jlong sys_time = 0;
3889 jlong user_time = 0;
3890
3891 // Reimplemented using getthrds64().
3892 //
3893 // Works like this:
3894 // For the thread in question, get the kernel thread id. Then get the
3895 // kernel thread statistics using that id.
3896 //
3897 // This only works of course when no pthread scheduling is used,
3898 // i.e. there is a 1:1 relationship to kernel threads.
3899 // On AIX, see AIXTHREAD_SCOPE variable.
3900
3901 pthread_t pthtid = thread->osthread()->pthread_id();
3902
3903 // retrieve kernel thread id for the pthread:
3904 tid64_t tid = 0;
3905 struct __pthrdsinfo pinfo;
3906 // I just love those otherworldly IBM APIs which force me to hand down
3907 // dummy buffers for stuff I dont care for...
3908 char dummy[1];
3909 int dummy_size = sizeof(dummy);
3910 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3911 dummy, &dummy_size) == 0) {
3912 tid = pinfo.__pi_tid;
3913 } else {
3914 tty->print_cr("pthread_getthrds_np failed.");
3915 error = true;
3916 }
3917
3918 // retrieve kernel timing info for that kernel thread
3919 if (!error) {
3920 struct thrdentry64 thrdentry;
3921 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3922 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3923 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3924 } else {
3925 tty->print_cr("pthread_getthrds_np failed.");
3926 error = true;
3927 }
3928 }
3929
3930 if (p_sys_time) {
3931 *p_sys_time = sys_time;
3932 }
3933
3934 if (p_user_time) {
3935 *p_user_time = user_time;
3936 }
3937
3938 if (error) {
3939 return false;
3940 }
3941
3942 return true;
3943 }
3944
3945 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3946 jlong sys_time;
3947 jlong user_time;
3948
3949 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3950 return -1;
3951 }
3952
3953 return user_sys_cpu_time ? sys_time + user_time : user_time;
3954 }
3955
3956 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3957 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3958 info_ptr->may_skip_backward = false; // elapsed time not wall time
3959 info_ptr->may_skip_forward = false; // elapsed time not wall time
3960 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3961 }
3962
3963 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3964 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3965 info_ptr->may_skip_backward = false; // elapsed time not wall time
3966 info_ptr->may_skip_forward = false; // elapsed time not wall time
3967 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3968 }
3969
3970 bool os::is_thread_cpu_time_supported() {
3971 return true;
3972 }
3973
3974 // System loadavg support. Returns -1 if load average cannot be obtained.
3975 // For now just return the system wide load average (no processor sets).
3976 int os::loadavg(double values[], int nelem) {
3977
3978 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3979 guarantee(values, "argument error");
3980
3981 if (os::Aix::on_pase()) {
3982
3983 // AS/400 PASE: use libo4 porting library
3984 double v[3] = { 0.0, 0.0, 0.0 };
3985
3986 if (libo4::get_load_avg(v, v + 1, v + 2)) {
3987 for (int i = 0; i < nelem; i ++) {
3988 values[i] = v[i];
3989 }
3990 return nelem;
3991 } else {
3992 return -1;
3993 }
3994
3995 } else {
3996
3997 // AIX: use libperfstat
3998 libperfstat::cpuinfo_t ci;
3999 if (libperfstat::get_cpuinfo(&ci)) {
4000 for (int i = 0; i < nelem; i++) {
4001 values[i] = ci.loadavg[i];
4002 }
4003 } else {
4004 return -1;
4005 }
4006 return nelem;
4007 }
4008 }
4009
4010 void os::pause() {
4011 char filename[MAX_PATH];
4012 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4013 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4014 } else {
4015 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4016 }
4017
4018 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4019 if (fd != -1) {
4020 struct stat buf;
4021 ::close(fd);
4022 while (::stat(filename, &buf) == 0) {
4023 (void)::poll(NULL, 0, 100);
4024 }
4025 } else {
4026 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4027 }
4028 }
4029
4030 bool os::is_primordial_thread(void) {
4031 if (pthread_self() == (pthread_t)1) {
4032 return true;
4033 } else {
4034 return false;
4035 }
4036 }
4037
4038 // OS recognitions (PASE/AIX, OS level) call this before calling any
4039 // one of Aix::on_pase(), Aix::os_version() static
4040 void os::Aix::initialize_os_info() {
4041
4042 assert(_on_pase == -1 && _os_version == 0, "already called.");
4043
4044 struct utsname uts;
4045 memset(&uts, 0, sizeof(uts));
4046 strcpy(uts.sysname, "?");
4047 if (::uname(&uts) == -1) {
4048 trcVerbose("uname failed (%d)", errno);
4049 guarantee(0, "Could not determine whether we run on AIX or PASE");
4050 } else {
4051 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4052 "node \"%s\" machine \"%s\"\n",
4053 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4054 const int major = atoi(uts.version);
4055 assert(major > 0, "invalid OS version");
4056 const int minor = atoi(uts.release);
4057 assert(minor > 0, "invalid OS release");
4058 _os_version = (major << 24) | (minor << 16);
4059 char ver_str[20] = {0};
4060 const char* name_str = "unknown OS";
4061 if (strcmp(uts.sysname, "OS400") == 0) {
4062 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4063 _on_pase = 1;
4064 if (os_version_short() < 0x0504) {
4065 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4066 assert(false, "OS/400 release too old.");
4067 }
4068 name_str = "OS/400 (pase)";
4069 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4070 } else if (strcmp(uts.sysname, "AIX") == 0) {
4071 // We run on AIX. We do not support versions older than AIX 7.1.
4072 _on_pase = 0;
4073 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4074 odmWrapper::determine_os_kernel_version(&_os_version);
4075 if (os_version_short() < 0x0701) {
4076 trcVerbose("AIX releases older than AIX 7.1 are not supported.");
4077 assert(false, "AIX release too old.");
4078 }
4079 name_str = "AIX";
4080 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4081 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4082 } else {
4083 assert(false, "%s", name_str);
4084 }
4085 trcVerbose("We run on %s %s", name_str, ver_str);
4086 }
4087
4088 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4089 } // end: os::Aix::initialize_os_info()
4090
4091 // Scan environment for important settings which might effect the VM.
4092 // Trace out settings. Warn about invalid settings and/or correct them.
4093 //
4094 // Must run after os::Aix::initialue_os_info().
4095 void os::Aix::scan_environment() {
4096
4097 char* p;
4098 int rc;
4099
4100 // Warn explicity if EXTSHM=ON is used. That switch changes how
4101 // System V shared memory behaves. One effect is that page size of
4102 // shared memory cannot be change dynamically, effectivly preventing
4103 // large pages from working.
4104 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4105 // recommendation is (in OSS notes) to switch it off.
4106 p = ::getenv("EXTSHM");
4107 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4108 if (p && strcasecmp(p, "ON") == 0) {
4109 _extshm = 1;
4110 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4111 if (!AllowExtshm) {
4112 // We allow under certain conditions the user to continue. However, we want this
4113 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4114 // that the VM is not able to allocate 64k pages for the heap.
4115 // We do not want to run with reduced performance.
4116 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4117 }
4118 } else {
4119 _extshm = 0;
4120 }
4121
4122 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4123 // Not tested, not supported.
4124 //
4125 // Note that it might be worth the trouble to test and to require it, if only to
4126 // get useful return codes for mprotect.
4127 //
4128 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4129 // exec() ? before loading the libjvm ? ....)
4130 p = ::getenv("XPG_SUS_ENV");
4131 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4132 if (p && strcmp(p, "ON") == 0) {
4133 _xpg_sus_mode = 1;
4134 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4135 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4136 // clobber address ranges. If we ever want to support that, we have to do some
4137 // testing first.
4138 guarantee(false, "XPG_SUS_ENV=ON not supported");
4139 } else {
4140 _xpg_sus_mode = 0;
4141 }
4142
4143 if (os::Aix::on_pase()) {
4144 p = ::getenv("QIBM_MULTI_THREADED");
4145 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4146 }
4147
4148 p = ::getenv("LDR_CNTRL");
4149 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4150 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4151 if (p && ::strstr(p, "TEXTPSIZE")) {
4152 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4153 "you may experience hangs or crashes on OS/400 V7R1.");
4154 }
4155 }
4156
4157 p = ::getenv("AIXTHREAD_GUARDPAGES");
4158 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4159
4160 } // end: os::Aix::scan_environment()
4161
4162 // PASE: initialize the libo4 library (PASE porting library).
4163 void os::Aix::initialize_libo4() {
4164 guarantee(os::Aix::on_pase(), "OS/400 only.");
4165 if (!libo4::init()) {
4166 trcVerbose("libo4 initialization failed.");
4167 assert(false, "libo4 initialization failed");
4168 } else {
4169 trcVerbose("libo4 initialized.");
4170 }
4171 }
4172
4173 // AIX: initialize the libperfstat library.
4174 void os::Aix::initialize_libperfstat() {
4175 assert(os::Aix::on_aix(), "AIX only");
4176 if (!libperfstat::init()) {
4177 trcVerbose("libperfstat initialization failed.");
4178 assert(false, "libperfstat initialization failed");
4179 } else {
4180 trcVerbose("libperfstat initialized.");
4181 }
4182 }
4183
4184 /////////////////////////////////////////////////////////////////////////////
4185 // thread stack
4186
4187 // Get the current stack base from the OS (actually, the pthread library).
4188 // Note: usually not page aligned.
4189 address os::current_stack_base() {
4190 AixMisc::stackbounds_t bounds;
4191 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4192 guarantee(rc, "Unable to retrieve stack bounds.");
4193 return bounds.base;
4194 }
4195
4196 // Get the current stack size from the OS (actually, the pthread library).
4197 // Returned size is such that (base - size) is always aligned to page size.
4198 size_t os::current_stack_size() {
4199 AixMisc::stackbounds_t bounds;
4200 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4201 guarantee(rc, "Unable to retrieve stack bounds.");
4202 // Align the returned stack size such that the stack low address
4203 // is aligned to page size (Note: base is usually not and we do not care).
4204 // We need to do this because caller code will assume stack low address is
4205 // page aligned and will place guard pages without checking.
4206 address low = bounds.base - bounds.size;
4207 address low_aligned = (address)align_up(low, os::vm_page_size());
4208 size_t s = bounds.base - low_aligned;
4209 return s;
4210 }
4211
4212 extern char** environ;
4213
4214 // Run the specified command in a separate process. Return its exit value,
4215 // or -1 on failure (e.g. can't fork a new process).
4216 // Unlike system(), this function can be called from signal handler. It
4217 // doesn't block SIGINT et al.
4218 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4219 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL};
4220
4221 pid_t pid = fork();
4222
4223 if (pid < 0) {
4224 // fork failed
4225 return -1;
4226
4227 } else if (pid == 0) {
4228 // child process
4229
4230 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4231 execve("/usr/bin/sh", argv, environ);
4232
4233 // execve failed
4234 _exit(-1);
4235
4236 } else {
4237 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4238 // care about the actual exit code, for now.
4239
4240 int status;
4241
4242 // Wait for the child process to exit. This returns immediately if
4243 // the child has already exited. */
4244 while (waitpid(pid, &status, 0) < 0) {
4245 switch (errno) {
4246 case ECHILD: return 0;
4247 case EINTR: break;
4248 default: return -1;
4249 }
4250 }
4251
4252 if (WIFEXITED(status)) {
4253 // The child exited normally; get its exit code.
4254 return WEXITSTATUS(status);
4255 } else if (WIFSIGNALED(status)) {
4256 // The child exited because of a signal.
4257 // The best value to return is 0x80 + signal number,
4258 // because that is what all Unix shells do, and because
4259 // it allows callers to distinguish between process exit and
4260 // process death by signal.
4261 return 0x80 + WTERMSIG(status);
4262 } else {
4263 // Unknown exit code; pass it through.
4264 return status;
4265 }
4266 }
4267 return -1;
4268 }
4269
4270 // Get the default path to the core file
4271 // Returns the length of the string
4272 int os::get_core_path(char* buffer, size_t bufferSize) {
4273 const char* p = get_current_directory(buffer, bufferSize);
4274
4275 if (p == NULL) {
4276 assert(p != NULL, "failed to get current directory");
4277 return 0;
4278 }
4279
4280 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4281 p, current_process_id());
4282
4283 return strlen(buffer);
4284 }
4285
4286 #ifndef PRODUCT
4287 void TestReserveMemorySpecial_test() {
4288 // No tests available for this platform
4289 }
4290 #endif
4291
4292 bool os::start_debugging(char *buf, int buflen) {
4293 int len = (int)strlen(buf);
4294 char *p = &buf[len];
4295
4296 jio_snprintf(p, buflen -len,
4297 "\n\n"
4298 "Do you want to debug the problem?\n\n"
4299 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4300 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4301 "Otherwise, press RETURN to abort...",
4302 os::current_process_id(),
4303 os::current_thread_id(), thread_self());
4304
4305 bool yes = os::message_box("Unexpected Error", buf);
4306
4307 if (yes) {
4308 // yes, user asked VM to launch debugger
4309 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4310
4311 os::fork_and_exec(buf);
4312 yes = false;
4313 }
4314 return yes;
4315 }
4316
4317 static inline time_t get_mtime(const char* filename) {
4318 struct stat st;
4319 int ret = os::stat(filename, &st);
4320 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
4321 return st.st_mtime;
4322 }
4323
4324 int os::compare_file_modified_times(const char* file1, const char* file2) {
4325 time_t t1 = get_mtime(file1);
4326 time_t t2 = get_mtime(file2);
4327 return t1 - t2;
4328 }
4329
4330 bool os::supports_map_sync() {
4331 return false;
4332 }