1 /*
2 * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2020 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/globals.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/os.hpp"
63 #include "runtime/osThread.hpp"
64 #include "runtime/perfMemory.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/statSampler.hpp"
67 #include "runtime/stubRoutines.hpp"
68 #include "runtime/thread.inline.hpp"
69 #include "runtime/threadCritical.hpp"
70 #include "runtime/timer.hpp"
71 #include "runtime/vm_version.hpp"
72 #include "services/attachListener.hpp"
73 #include "services/runtimeService.hpp"
74 #include "utilities/align.hpp"
75 #include "utilities/decoder.hpp"
76 #include "utilities/defaultStream.hpp"
77 #include "utilities/events.hpp"
78 #include "utilities/growableArray.hpp"
79 #include "utilities/vmError.hpp"
80
81 // put OS-includes here (sorted alphabetically)
82 #include <errno.h>
83 #include <fcntl.h>
84 #include <inttypes.h>
85 #include <poll.h>
86 #include <procinfo.h>
87 #include <pthread.h>
88 #include <pwd.h>
89 #include <semaphore.h>
90 #include <signal.h>
91 #include <stdint.h>
92 #include <stdio.h>
93 #include <string.h>
94 #include <unistd.h>
95 #include <sys/ioctl.h>
96 #include <sys/ipc.h>
97 #include <sys/mman.h>
98 #include <sys/resource.h>
99 #include <sys/select.h>
100 #include <sys/shm.h>
101 #include <sys/socket.h>
102 #include <sys/stat.h>
103 #include <sys/sysinfo.h>
104 #include <sys/systemcfg.h>
105 #include <sys/time.h>
106 #include <sys/times.h>
107 #include <sys/types.h>
108 #include <sys/utsname.h>
109 #include <sys/vminfo.h>
110 #include <sys/wait.h>
111
112 // Missing prototypes for various system APIs.
113 extern "C"
114 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
115
116 #if !defined(_AIXVERSION_610)
117 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
118 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
119 extern "C" int getargs(procsinfo*, int, char*, int);
120 #endif
121
122 #define MAX_PATH (2 * K)
123
124 // for timer info max values which include all bits
125 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
126 // for multipage initialization error analysis (in 'g_multipage_error')
127 #define ERROR_MP_OS_TOO_OLD 100
128 #define ERROR_MP_EXTSHM_ACTIVE 101
129 #define ERROR_MP_VMGETINFO_FAILED 102
130 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
131
132 // excerpts from systemcfg.h that might be missing on older os levels
133 #ifndef PV_7
134 #define PV_7 0x200000 /* Power PC 7 */
135 #endif
136 #ifndef PV_7_Compat
137 #define PV_7_Compat 0x208000 /* Power PC 7 */
138 #endif
139 #ifndef PV_8
140 #define PV_8 0x300000 /* Power PC 8 */
141 #endif
142 #ifndef PV_8_Compat
143 #define PV_8_Compat 0x308000 /* Power PC 8 */
144 #endif
145 #ifndef PV_9
146 #define PV_9 0x400000 /* Power PC 9 */
147 #endif
148 #ifndef PV_9_Compat
149 #define PV_9_Compat 0x408000 /* Power PC 9 */
150 #endif
151
152
153 static address resolve_function_descriptor_to_code_pointer(address p);
154
155 static void vmembk_print_on(outputStream* os);
156
157 ////////////////////////////////////////////////////////////////////////////////
158 // global variables (for a description see os_aix.hpp)
159
160 julong os::Aix::_physical_memory = 0;
161
162 pthread_t os::Aix::_main_thread = ((pthread_t)0);
163 int os::Aix::_page_size = -1;
164
165 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
166 int os::Aix::_on_pase = -1;
167
168 // 0 = uninitialized, otherwise 32 bit number:
169 // 0xVVRRTTSS
170 // VV - major version
171 // RR - minor version
172 // TT - tech level, if known, 0 otherwise
173 // SS - service pack, if known, 0 otherwise
174 uint32_t os::Aix::_os_version = 0;
175
176 // -1 = uninitialized, 0 - no, 1 - yes
177 int os::Aix::_xpg_sus_mode = -1;
178
179 // -1 = uninitialized, 0 - no, 1 - yes
180 int os::Aix::_extshm = -1;
181
182 ////////////////////////////////////////////////////////////////////////////////
183 // local variables
184
185 static volatile jlong max_real_time = 0;
186 static jlong initial_time_count = 0;
187 static int clock_tics_per_sec = 100;
188 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
189 static bool check_signals = true;
190 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
191 static sigset_t SR_sigset;
192
193 // Process break recorded at startup.
194 static address g_brk_at_startup = NULL;
195
196 // This describes the state of multipage support of the underlying
197 // OS. Note that this is of no interest to the outsize world and
198 // therefore should not be defined in AIX class.
199 //
200 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
201 // latter two (16M "large" resp. 16G "huge" pages) require special
202 // setup and are normally not available.
203 //
204 // AIX supports multiple page sizes per process, for:
205 // - Stack (of the primordial thread, so not relevant for us)
206 // - Data - data, bss, heap, for us also pthread stacks
207 // - Text - text code
208 // - shared memory
209 //
210 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
211 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
212 //
213 // For shared memory, page size can be set dynamically via
214 // shmctl(). Different shared memory regions can have different page
215 // sizes.
216 //
217 // More information can be found at AIBM info center:
218 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
219 //
220 static struct {
221 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
222 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
223 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
224 size_t pthr_stack_pagesize; // stack page size of pthread threads
225 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
226 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
227 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
228 int error; // Error describing if something went wrong at multipage init.
229 } g_multipage_support = {
230 (size_t) -1,
231 (size_t) -1,
232 (size_t) -1,
233 (size_t) -1,
234 (size_t) -1,
235 false, false,
236 0
237 };
238
239 // We must not accidentally allocate memory close to the BRK - even if
240 // that would work - because then we prevent the BRK segment from
241 // growing which may result in a malloc OOM even though there is
242 // enough memory. The problem only arises if we shmat() or mmap() at
243 // a specific wish address, e.g. to place the heap in a
244 // compressed-oops-friendly way.
245 static bool is_close_to_brk(address a) {
246 assert0(g_brk_at_startup != NULL);
247 if (a >= g_brk_at_startup &&
248 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
249 return true;
250 }
251 return false;
252 }
253
254 julong os::available_memory() {
255 return Aix::available_memory();
256 }
257
258 julong os::Aix::available_memory() {
259 // Avoid expensive API call here, as returned value will always be null.
260 if (os::Aix::on_pase()) {
261 return 0x0LL;
262 }
263 os::Aix::meminfo_t mi;
264 if (os::Aix::get_meminfo(&mi)) {
265 return mi.real_free;
266 } else {
267 return ULONG_MAX;
268 }
269 }
270
271 julong os::physical_memory() {
272 return Aix::physical_memory();
273 }
274
275 // Return true if user is running as root.
276
277 bool os::have_special_privileges() {
278 static bool init = false;
279 static bool privileges = false;
280 if (!init) {
281 privileges = (getuid() != geteuid()) || (getgid() != getegid());
282 init = true;
283 }
284 return privileges;
285 }
286
287 // Helper function, emulates disclaim64 using multiple 32bit disclaims
288 // because we cannot use disclaim64() on AS/400 and old AIX releases.
289 static bool my_disclaim64(char* addr, size_t size) {
290
291 if (size == 0) {
292 return true;
293 }
294
295 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
296 const unsigned int maxDisclaimSize = 0x40000000;
297
298 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
299 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
300
301 char* p = addr;
302
303 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
304 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
305 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
306 return false;
307 }
308 p += maxDisclaimSize;
309 }
310
311 if (lastDisclaimSize > 0) {
312 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
313 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
314 return false;
315 }
316 }
317
318 return true;
319 }
320
321 // Cpu architecture string
322 #if defined(PPC32)
323 static char cpu_arch[] = "ppc";
324 #elif defined(PPC64)
325 static char cpu_arch[] = "ppc64";
326 #else
327 #error Add appropriate cpu_arch setting
328 #endif
329
330 // Wrap the function "vmgetinfo" which is not available on older OS releases.
331 static int checked_vmgetinfo(void *out, int command, int arg) {
332 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
333 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
334 }
335 return ::vmgetinfo(out, command, arg);
336 }
337
338 // Given an address, returns the size of the page backing that address.
339 size_t os::Aix::query_pagesize(void* addr) {
340
341 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
342 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
343 return 4*K;
344 }
345
346 vm_page_info pi;
347 pi.addr = (uint64_t)addr;
348 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
349 return pi.pagesize;
350 } else {
351 assert(false, "vmgetinfo failed to retrieve page size");
352 return 4*K;
353 }
354 }
355
356 void os::Aix::initialize_system_info() {
357
358 // Get the number of online(logical) cpus instead of configured.
359 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
360 assert(_processor_count > 0, "_processor_count must be > 0");
361
362 // Retrieve total physical storage.
363 os::Aix::meminfo_t mi;
364 if (!os::Aix::get_meminfo(&mi)) {
365 assert(false, "os::Aix::get_meminfo failed.");
366 }
367 _physical_memory = (julong) mi.real_total;
368 }
369
370 // Helper function for tracing page sizes.
371 static const char* describe_pagesize(size_t pagesize) {
372 switch (pagesize) {
373 case 4*K : return "4K";
374 case 64*K: return "64K";
375 case 16*M: return "16M";
376 case 16*G: return "16G";
377 default:
378 assert(false, "surprise");
379 return "??";
380 }
381 }
382
383 // Probe OS for multipage support.
384 // Will fill the global g_multipage_support structure.
385 // Must be called before calling os::large_page_init().
386 static void query_multipage_support() {
387
388 guarantee(g_multipage_support.pagesize == -1,
389 "do not call twice");
390
391 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
392
393 // This really would surprise me.
394 assert(g_multipage_support.pagesize == 4*K, "surprise!");
395
396 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
397 // Default data page size is defined either by linker options (-bdatapsize)
398 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
399 // default should be 4K.
400 {
401 void* p = ::malloc(16*M);
402 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
403 ::free(p);
404 }
405
406 // Query default shm page size (LDR_CNTRL SHMPSIZE).
407 // Note that this is pure curiosity. We do not rely on default page size but set
408 // our own page size after allocated.
409 {
410 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
411 guarantee(shmid != -1, "shmget failed");
412 void* p = ::shmat(shmid, NULL, 0);
413 ::shmctl(shmid, IPC_RMID, NULL);
414 guarantee(p != (void*) -1, "shmat failed");
415 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
416 ::shmdt(p);
417 }
418
419 // Before querying the stack page size, make sure we are not running as primordial
420 // thread (because primordial thread's stack may have different page size than
421 // pthread thread stacks). Running a VM on the primordial thread won't work for a
422 // number of reasons so we may just as well guarantee it here.
423 guarantee0(!os::is_primordial_thread());
424
425 // Query pthread stack page size. Should be the same as data page size because
426 // pthread stacks are allocated from C-Heap.
427 {
428 int dummy = 0;
429 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
430 }
431
432 // Query default text page size (LDR_CNTRL TEXTPSIZE).
433 {
434 address any_function =
435 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
436 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
437 }
438
439 // Now probe for support of 64K pages and 16M pages.
440
441 // Before OS/400 V6R1, there is no support for pages other than 4K.
442 if (os::Aix::on_pase_V5R4_or_older()) {
443 trcVerbose("OS/400 < V6R1 - no large page support.");
444 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
445 goto query_multipage_support_end;
446 }
447
448 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
449 {
450 const int MAX_PAGE_SIZES = 4;
451 psize_t sizes[MAX_PAGE_SIZES];
452 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
453 if (num_psizes == -1) {
454 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
455 trcVerbose("disabling multipage support.");
456 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
457 goto query_multipage_support_end;
458 }
459 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
460 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
461 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
462 for (int i = 0; i < num_psizes; i ++) {
463 trcVerbose(" %s ", describe_pagesize(sizes[i]));
464 }
465
466 // Can we use 64K, 16M pages?
467 for (int i = 0; i < num_psizes; i ++) {
468 const size_t pagesize = sizes[i];
469 if (pagesize != 64*K && pagesize != 16*M) {
470 continue;
471 }
472 bool can_use = false;
473 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
474 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
475 IPC_CREAT | S_IRUSR | S_IWUSR);
476 guarantee0(shmid != -1); // Should always work.
477 // Try to set pagesize.
478 struct shmid_ds shm_buf = { 0 };
479 shm_buf.shm_pagesize = pagesize;
480 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
481 const int en = errno;
482 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
483 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno);
484 } else {
485 // Attach and double check pageisze.
486 void* p = ::shmat(shmid, NULL, 0);
487 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
488 guarantee0(p != (void*) -1); // Should always work.
489 const size_t real_pagesize = os::Aix::query_pagesize(p);
490 if (real_pagesize != pagesize) {
491 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize);
492 } else {
493 can_use = true;
494 }
495 ::shmdt(p);
496 }
497 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
498 if (pagesize == 64*K) {
499 g_multipage_support.can_use_64K_pages = can_use;
500 } else if (pagesize == 16*M) {
501 g_multipage_support.can_use_16M_pages = can_use;
502 }
503 }
504
505 } // end: check which pages can be used for shared memory
506
507 query_multipage_support_end:
508
509 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
510 describe_pagesize(g_multipage_support.pagesize));
511 trcVerbose("Data page size (C-Heap, bss, etc): %s",
512 describe_pagesize(g_multipage_support.datapsize));
513 trcVerbose("Text page size: %s",
514 describe_pagesize(g_multipage_support.textpsize));
515 trcVerbose("Thread stack page size (pthread): %s",
516 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
517 trcVerbose("Default shared memory page size: %s",
518 describe_pagesize(g_multipage_support.shmpsize));
519 trcVerbose("Can use 64K pages dynamically with shared memory: %s",
520 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
521 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
522 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
523 trcVerbose("Multipage error details: %d",
524 g_multipage_support.error);
525
526 // sanity checks
527 assert0(g_multipage_support.pagesize == 4*K);
528 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
529 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
530 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
531 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
532
533 }
534
535 void os::init_system_properties_values() {
536
537 #ifndef OVERRIDE_LIBPATH
538 #define DEFAULT_LIBPATH "/lib:/usr/lib"
539 #else
540 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
541 #endif
542 #define EXTENSIONS_DIR "/lib/ext"
543
544 // Buffer that fits several sprintfs.
545 // Note that the space for the trailing null is provided
546 // by the nulls included by the sizeof operator.
547 const size_t bufsize =
548 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
549 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
550 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
551
552 // sysclasspath, java_home, dll_dir
553 {
554 char *pslash;
555 os::jvm_path(buf, bufsize);
556
557 // Found the full path to libjvm.so.
558 // Now cut the path to <java_home>/jre if we can.
559 pslash = strrchr(buf, '/');
560 if (pslash != NULL) {
561 *pslash = '\0'; // Get rid of /libjvm.so.
562 }
563 pslash = strrchr(buf, '/');
564 if (pslash != NULL) {
565 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
566 }
567 Arguments::set_dll_dir(buf);
568
569 if (pslash != NULL) {
570 pslash = strrchr(buf, '/');
571 if (pslash != NULL) {
572 *pslash = '\0'; // Get rid of /lib.
573 }
574 }
575 Arguments::set_java_home(buf);
576 if (!set_boot_path('/', ':')) {
577 vm_exit_during_initialization("Failed setting boot class path.", NULL);
578 }
579 }
580
581 // Where to look for native libraries.
582
583 // On Aix we get the user setting of LIBPATH.
584 // Eventually, all the library path setting will be done here.
585 // Get the user setting of LIBPATH.
586 const char *v = ::getenv("LIBPATH");
587 const char *v_colon = ":";
588 if (v == NULL) { v = ""; v_colon = ""; }
589
590 // Concatenate user and invariant part of ld_library_path.
591 // That's +1 for the colon and +1 for the trailing '\0'.
592 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
593 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
594 Arguments::set_library_path(ld_library_path);
595 FREE_C_HEAP_ARRAY(char, ld_library_path);
596
597 // Extensions directories.
598 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
599 Arguments::set_ext_dirs(buf);
600
601 FREE_C_HEAP_ARRAY(char, buf);
602
603 #undef DEFAULT_LIBPATH
604 #undef EXTENSIONS_DIR
605 }
606
607 ////////////////////////////////////////////////////////////////////////////////
608 // breakpoint support
609
610 void os::breakpoint() {
611 BREAKPOINT;
612 }
613
614 extern "C" void breakpoint() {
615 // use debugger to set breakpoint here
616 }
617
618 ////////////////////////////////////////////////////////////////////////////////
619 // signal support
620
621 debug_only(static bool signal_sets_initialized = false);
622 static sigset_t unblocked_sigs, vm_sigs;
623
624 void os::Aix::signal_sets_init() {
625 // Should also have an assertion stating we are still single-threaded.
626 assert(!signal_sets_initialized, "Already initialized");
627 // Fill in signals that are necessarily unblocked for all threads in
628 // the VM. Currently, we unblock the following signals:
629 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
630 // by -Xrs (=ReduceSignalUsage));
631 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
632 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
633 // the dispositions or masks wrt these signals.
634 // Programs embedding the VM that want to use the above signals for their
635 // own purposes must, at this time, use the "-Xrs" option to prevent
636 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
637 // (See bug 4345157, and other related bugs).
638 // In reality, though, unblocking these signals is really a nop, since
639 // these signals are not blocked by default.
640 sigemptyset(&unblocked_sigs);
641 sigaddset(&unblocked_sigs, SIGILL);
642 sigaddset(&unblocked_sigs, SIGSEGV);
643 sigaddset(&unblocked_sigs, SIGBUS);
644 sigaddset(&unblocked_sigs, SIGFPE);
645 sigaddset(&unblocked_sigs, SIGTRAP);
646 sigaddset(&unblocked_sigs, SR_signum);
647
648 if (!ReduceSignalUsage) {
649 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
650 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
651 }
652 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
653 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
654 }
655 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
656 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
657 }
658 }
659 // Fill in signals that are blocked by all but the VM thread.
660 sigemptyset(&vm_sigs);
661 if (!ReduceSignalUsage)
662 sigaddset(&vm_sigs, BREAK_SIGNAL);
663 debug_only(signal_sets_initialized = true);
664 }
665
666 // These are signals that are unblocked while a thread is running Java.
667 // (For some reason, they get blocked by default.)
668 sigset_t* os::Aix::unblocked_signals() {
669 assert(signal_sets_initialized, "Not initialized");
670 return &unblocked_sigs;
671 }
672
673 // These are the signals that are blocked while a (non-VM) thread is
674 // running Java. Only the VM thread handles these signals.
675 sigset_t* os::Aix::vm_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &vm_sigs;
678 }
679
680 void os::Aix::hotspot_sigmask(Thread* thread) {
681
682 //Save caller's signal mask before setting VM signal mask
683 sigset_t caller_sigmask;
684 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
685
686 OSThread* osthread = thread->osthread();
687 osthread->set_caller_sigmask(caller_sigmask);
688
689 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
690
691 if (!ReduceSignalUsage) {
692 if (thread->is_VM_thread()) {
693 // Only the VM thread handles BREAK_SIGNAL ...
694 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
695 } else {
696 // ... all other threads block BREAK_SIGNAL
697 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
698 }
699 }
700 }
701
702 // retrieve memory information.
703 // Returns false if something went wrong;
704 // content of pmi undefined in this case.
705 bool os::Aix::get_meminfo(meminfo_t* pmi) {
706
707 assert(pmi, "get_meminfo: invalid parameter");
708
709 memset(pmi, 0, sizeof(meminfo_t));
710
711 if (os::Aix::on_pase()) {
712 // On PASE, use the libo4 porting library.
713
714 unsigned long long virt_total = 0;
715 unsigned long long real_total = 0;
716 unsigned long long real_free = 0;
717 unsigned long long pgsp_total = 0;
718 unsigned long long pgsp_free = 0;
719 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
720 pmi->virt_total = virt_total;
721 pmi->real_total = real_total;
722 pmi->real_free = real_free;
723 pmi->pgsp_total = pgsp_total;
724 pmi->pgsp_free = pgsp_free;
725 return true;
726 }
727 return false;
728
729 } else {
730
731 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
732 // See:
733 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
734 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
736 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
737
738 perfstat_memory_total_t psmt;
739 memset (&psmt, '\0', sizeof(psmt));
740 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
741 if (rc == -1) {
742 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
743 assert(0, "perfstat_memory_total() failed");
744 return false;
745 }
746
747 assert(rc == 1, "perfstat_memory_total() - weird return code");
748
749 // excerpt from
750 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
751 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
752 // The fields of perfstat_memory_total_t:
753 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
754 // u_longlong_t real_total Total real memory (in 4 KB pages).
755 // u_longlong_t real_free Free real memory (in 4 KB pages).
756 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
757 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
758
759 pmi->virt_total = psmt.virt_total * 4096;
760 pmi->real_total = psmt.real_total * 4096;
761 pmi->real_free = psmt.real_free * 4096;
762 pmi->pgsp_total = psmt.pgsp_total * 4096;
763 pmi->pgsp_free = psmt.pgsp_free * 4096;
764
765 return true;
766
767 }
768 } // end os::Aix::get_meminfo
769
770 //////////////////////////////////////////////////////////////////////////////
771 // create new thread
772
773 // Thread start routine for all newly created threads
774 static void *thread_native_entry(Thread *thread) {
775
776 thread->record_stack_base_and_size();
777
778 const pthread_t pthread_id = ::pthread_self();
779 const tid_t kernel_thread_id = ::thread_self();
780
781 LogTarget(Info, os, thread) lt;
782 if (lt.is_enabled()) {
783 address low_address = thread->stack_end();
784 address high_address = thread->stack_base();
785 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
786 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
787 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
788 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
789 }
790
791 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
792 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
793 // tools hook pthread_create(). In this case, we may run into problems establishing
794 // guard pages on those stacks, because the stacks may reside in memory which is not
795 // protectable (shmated).
796 if (thread->stack_base() > ::sbrk(0)) {
797 log_warning(os, thread)("Thread stack not in data segment.");
798 }
799
800 // Try to randomize the cache line index of hot stack frames.
801 // This helps when threads of the same stack traces evict each other's
802 // cache lines. The threads can be either from the same JVM instance, or
803 // from different JVM instances. The benefit is especially true for
804 // processors with hyperthreading technology.
805
806 static int counter = 0;
807 int pid = os::current_process_id();
808 alloca(((pid ^ counter++) & 7) * 128);
809
810 thread->initialize_thread_current();
811
812 OSThread* osthread = thread->osthread();
813
814 // Thread_id is pthread id.
815 osthread->set_thread_id(pthread_id);
816
817 // .. but keep kernel thread id too for diagnostics
818 osthread->set_kernel_thread_id(kernel_thread_id);
819
820 // Initialize signal mask for this thread.
821 os::Aix::hotspot_sigmask(thread);
822
823 // Initialize floating point control register.
824 os::Aix::init_thread_fpu_state();
825
826 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
827
828 // Call one more level start routine.
829 thread->call_run();
830
831 // Note: at this point the thread object may already have deleted itself.
832 // Prevent dereferencing it from here on out.
833 thread = NULL;
834
835 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
836 os::current_thread_id(), (uintx) kernel_thread_id);
837
838 return 0;
839 }
840
841 bool os::create_thread(Thread* thread, ThreadType thr_type,
842 size_t req_stack_size) {
843
844 assert(thread->osthread() == NULL, "caller responsible");
845
846 // Allocate the OSThread object.
847 OSThread* osthread = new OSThread(NULL, NULL);
848 if (osthread == NULL) {
849 return false;
850 }
851
852 // Set the correct thread state.
853 osthread->set_thread_type(thr_type);
854
855 // Initial state is ALLOCATED but not INITIALIZED
856 osthread->set_state(ALLOCATED);
857
858 thread->set_osthread(osthread);
859
860 // Init thread attributes.
861 pthread_attr_t attr;
862 pthread_attr_init(&attr);
863 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
864
865 // Make sure we run in 1:1 kernel-user-thread mode.
866 if (os::Aix::on_aix()) {
867 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
868 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
869 }
870
871 // Start in suspended state, and in os::thread_start, wake the thread up.
872 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
873
874 // Calculate stack size if it's not specified by caller.
875 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
876
877 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
878 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
879 // This very much looks like a pthread lib error. As a workaround, increase the stack size
880 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
881 if (stack_size < 4096 * K) {
882 stack_size += 64 * K;
883 }
884
885 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
886 // thread size in attr unchanged. If this is the minimal stack size as set
887 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
888 // guard pages might not fit on the tiny stack created.
889 int ret = pthread_attr_setstacksize(&attr, stack_size);
890 if (ret != 0) {
891 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
892 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
893 stack_size / K);
894 thread->set_osthread(NULL);
895 delete osthread;
896 return false;
897 }
898
899 // Save some cycles and a page by disabling OS guard pages where we have our own
900 // VM guard pages (in java threads). For other threads, keep system default guard
901 // pages in place.
902 if (thr_type == java_thread || thr_type == compiler_thread) {
903 ret = pthread_attr_setguardsize(&attr, 0);
904 }
905
906 pthread_t tid = 0;
907 if (ret == 0) {
908 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
909 }
910
911 if (ret == 0) {
912 char buf[64];
913 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
914 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
915 } else {
916 char buf[64];
917 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
918 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
919 // Log some OS information which might explain why creating the thread failed.
920 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
921 LogStream st(Log(os, thread)::info());
922 os::Posix::print_rlimit_info(&st);
923 os::print_memory_info(&st);
924 }
925
926 pthread_attr_destroy(&attr);
927
928 if (ret != 0) {
929 // Need to clean up stuff we've allocated so far.
930 thread->set_osthread(NULL);
931 delete osthread;
932 return false;
933 }
934
935 // OSThread::thread_id is the pthread id.
936 osthread->set_thread_id(tid);
937
938 return true;
939 }
940
941 /////////////////////////////////////////////////////////////////////////////
942 // attach existing thread
943
944 // bootstrap the main thread
945 bool os::create_main_thread(JavaThread* thread) {
946 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
947 return create_attached_thread(thread);
948 }
949
950 bool os::create_attached_thread(JavaThread* thread) {
951 #ifdef ASSERT
952 thread->verify_not_published();
953 #endif
954
955 // Allocate the OSThread object
956 OSThread* osthread = new OSThread(NULL, NULL);
957
958 if (osthread == NULL) {
959 return false;
960 }
961
962 const pthread_t pthread_id = ::pthread_self();
963 const tid_t kernel_thread_id = ::thread_self();
964
965 // OSThread::thread_id is the pthread id.
966 osthread->set_thread_id(pthread_id);
967
968 // .. but keep kernel thread id too for diagnostics
969 osthread->set_kernel_thread_id(kernel_thread_id);
970
971 // initialize floating point control register
972 os::Aix::init_thread_fpu_state();
973
974 // Initial thread state is RUNNABLE
975 osthread->set_state(RUNNABLE);
976
977 thread->set_osthread(osthread);
978
979 if (UseNUMA) {
980 int lgrp_id = os::numa_get_group_id();
981 if (lgrp_id != -1) {
982 thread->set_lgrp_id(lgrp_id);
983 }
984 }
985
986 // initialize signal mask for this thread
987 // and save the caller's signal mask
988 os::Aix::hotspot_sigmask(thread);
989
990 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
991 os::current_thread_id(), (uintx) kernel_thread_id);
992
993 return true;
994 }
995
996 void os::pd_start_thread(Thread* thread) {
997 int status = pthread_continue_np(thread->osthread()->pthread_id());
998 assert(status == 0, "thr_continue failed");
999 }
1000
1001 // Free OS resources related to the OSThread
1002 void os::free_thread(OSThread* osthread) {
1003 assert(osthread != NULL, "osthread not set");
1004
1005 // We are told to free resources of the argument thread,
1006 // but we can only really operate on the current thread.
1007 assert(Thread::current()->osthread() == osthread,
1008 "os::free_thread but not current thread");
1009
1010 // Restore caller's signal mask
1011 sigset_t sigmask = osthread->caller_sigmask();
1012 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1013
1014 delete osthread;
1015 }
1016
1017 ////////////////////////////////////////////////////////////////////////////////
1018 // time support
1019
1020 // Time since start-up in seconds to a fine granularity.
1021 // Used by VMSelfDestructTimer and the MemProfiler.
1022 double os::elapsedTime() {
1023 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
1024 }
1025
1026 jlong os::elapsed_counter() {
1027 return javaTimeNanos() - initial_time_count;
1028 }
1029
1030 jlong os::elapsed_frequency() {
1031 return NANOSECS_PER_SEC; // nanosecond resolution
1032 }
1033
1034 bool os::supports_vtime() { return true; }
1035
1036 double os::elapsedVTime() {
1037 struct rusage usage;
1038 int retval = getrusage(RUSAGE_THREAD, &usage);
1039 if (retval == 0) {
1040 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1041 } else {
1042 // better than nothing, but not much
1043 return elapsedTime();
1044 }
1045 }
1046
1047 jlong os::javaTimeMillis() {
1048 timeval time;
1049 int status = gettimeofday(&time, NULL);
1050 assert(status != -1, "aix error at gettimeofday()");
1051 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1052 }
1053
1054 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1055 timeval time;
1056 int status = gettimeofday(&time, NULL);
1057 assert(status != -1, "aix error at gettimeofday()");
1058 seconds = jlong(time.tv_sec);
1059 nanos = jlong(time.tv_usec) * 1000;
1060 }
1061
1062 // We use mread_real_time here.
1063 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1064 // it has to be converted to real time. AIX documentations suggests to do
1065 // this unconditionally, so we do it.
1066 //
1067 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1068 //
1069 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1070 // conversion is necessary. However, mread_real_time will not return
1071 // monotonic results but merely matches read_real_time. So we need a tweak
1072 // to ensure monotonic results.
1073 //
1074 // For PASE no public documentation exists, just word by IBM
1075 jlong os::javaTimeNanos() {
1076 timebasestruct_t time;
1077 int rc = mread_real_time(&time, TIMEBASE_SZ);
1078 if (os::Aix::on_pase()) {
1079 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1080 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1081 jlong prev = max_real_time;
1082 if (now <= prev) {
1083 return prev; // same or retrograde time;
1084 }
1085 jlong obsv = Atomic::cmpxchg(&max_real_time, prev, now);
1086 assert(obsv >= prev, "invariant"); // Monotonicity
1087 // If the CAS succeeded then we're done and return "now".
1088 // If the CAS failed and the observed value "obsv" is >= now then
1089 // we should return "obsv". If the CAS failed and now > obsv > prv then
1090 // some other thread raced this thread and installed a new value, in which case
1091 // we could either (a) retry the entire operation, (b) retry trying to install now
1092 // or (c) just return obsv. We use (c). No loop is required although in some cases
1093 // we might discard a higher "now" value in deference to a slightly lower but freshly
1094 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1095 // to (a) or (b) -- and greatly reduces coherence traffic.
1096 // We might also condition (c) on the magnitude of the delta between obsv and now.
1097 // Avoiding excessive CAS operations to hot RW locations is critical.
1098 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1099 return (prev == obsv) ? now : obsv;
1100 } else {
1101 if (rc != RTC_POWER) {
1102 rc = time_base_to_time(&time, TIMEBASE_SZ);
1103 assert(rc != -1, "error calling time_base_to_time()");
1104 }
1105 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1106 }
1107 }
1108
1109 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1110 info_ptr->max_value = ALL_64_BITS;
1111 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1112 info_ptr->may_skip_backward = false;
1113 info_ptr->may_skip_forward = false;
1114 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1115 }
1116
1117 // Return the real, user, and system times in seconds from an
1118 // arbitrary fixed point in the past.
1119 bool os::getTimesSecs(double* process_real_time,
1120 double* process_user_time,
1121 double* process_system_time) {
1122 struct tms ticks;
1123 clock_t real_ticks = times(&ticks);
1124
1125 if (real_ticks == (clock_t) (-1)) {
1126 return false;
1127 } else {
1128 double ticks_per_second = (double) clock_tics_per_sec;
1129 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1130 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1131 *process_real_time = ((double) real_ticks) / ticks_per_second;
1132
1133 return true;
1134 }
1135 }
1136
1137 char * os::local_time_string(char *buf, size_t buflen) {
1138 struct tm t;
1139 time_t long_time;
1140 time(&long_time);
1141 localtime_r(&long_time, &t);
1142 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1143 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1144 t.tm_hour, t.tm_min, t.tm_sec);
1145 return buf;
1146 }
1147
1148 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1149 return localtime_r(clock, res);
1150 }
1151
1152 ////////////////////////////////////////////////////////////////////////////////
1153 // runtime exit support
1154
1155 // Note: os::shutdown() might be called very early during initialization, or
1156 // called from signal handler. Before adding something to os::shutdown(), make
1157 // sure it is async-safe and can handle partially initialized VM.
1158 void os::shutdown() {
1159
1160 // allow PerfMemory to attempt cleanup of any persistent resources
1161 perfMemory_exit();
1162
1163 // needs to remove object in file system
1164 AttachListener::abort();
1165
1166 // flush buffered output, finish log files
1167 ostream_abort();
1168
1169 // Check for abort hook
1170 abort_hook_t abort_hook = Arguments::abort_hook();
1171 if (abort_hook != NULL) {
1172 abort_hook();
1173 }
1174 }
1175
1176 // Note: os::abort() might be called very early during initialization, or
1177 // called from signal handler. Before adding something to os::abort(), make
1178 // sure it is async-safe and can handle partially initialized VM.
1179 void os::abort(bool dump_core, void* siginfo, const void* context) {
1180 os::shutdown();
1181 if (dump_core) {
1182 ::abort(); // dump core
1183 }
1184
1185 ::exit(1);
1186 }
1187
1188 // Die immediately, no exit hook, no abort hook, no cleanup.
1189 // Dump a core file, if possible, for debugging.
1190 void os::die() {
1191 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1192 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1193 // and don't take the time to generate a core file.
1194 os::signal_raise(SIGKILL);
1195 } else {
1196 ::abort();
1197 }
1198 }
1199
1200 intx os::current_thread_id() {
1201 return (intx)pthread_self();
1202 }
1203
1204 int os::current_process_id() {
1205 return getpid();
1206 }
1207
1208 // DLL functions
1209
1210 const char* os::dll_file_extension() { return ".so"; }
1211
1212 // This must be hard coded because it's the system's temporary
1213 // directory not the java application's temp directory, ala java.io.tmpdir.
1214 const char* os::get_temp_directory() { return "/tmp"; }
1215
1216 // Check if addr is inside libjvm.so.
1217 bool os::address_is_in_vm(address addr) {
1218
1219 // Input could be a real pc or a function pointer literal. The latter
1220 // would be a function descriptor residing in the data segment of a module.
1221 loaded_module_t lm;
1222 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1223 return lm.is_in_vm;
1224 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1225 return lm.is_in_vm;
1226 } else {
1227 return false;
1228 }
1229
1230 }
1231
1232 // Resolve an AIX function descriptor literal to a code pointer.
1233 // If the input is a valid code pointer to a text segment of a loaded module,
1234 // it is returned unchanged.
1235 // If the input is a valid AIX function descriptor, it is resolved to the
1236 // code entry point.
1237 // If the input is neither a valid function descriptor nor a valid code pointer,
1238 // NULL is returned.
1239 static address resolve_function_descriptor_to_code_pointer(address p) {
1240
1241 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1242 // It is a real code pointer.
1243 return p;
1244 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1245 // Pointer to data segment, potential function descriptor.
1246 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1247 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1248 // It is a function descriptor.
1249 return code_entry;
1250 }
1251 }
1252
1253 return NULL;
1254 }
1255
1256 bool os::dll_address_to_function_name(address addr, char *buf,
1257 int buflen, int *offset,
1258 bool demangle) {
1259 if (offset) {
1260 *offset = -1;
1261 }
1262 // Buf is not optional, but offset is optional.
1263 assert(buf != NULL, "sanity check");
1264 buf[0] = '\0';
1265
1266 // Resolve function ptr literals first.
1267 addr = resolve_function_descriptor_to_code_pointer(addr);
1268 if (!addr) {
1269 return false;
1270 }
1271
1272 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1273 }
1274
1275 bool os::dll_address_to_library_name(address addr, char* buf,
1276 int buflen, int* offset) {
1277 if (offset) {
1278 *offset = -1;
1279 }
1280 // Buf is not optional, but offset is optional.
1281 assert(buf != NULL, "sanity check");
1282 buf[0] = '\0';
1283
1284 // Resolve function ptr literals first.
1285 addr = resolve_function_descriptor_to_code_pointer(addr);
1286 if (!addr) {
1287 return false;
1288 }
1289
1290 return AixSymbols::get_module_name(addr, buf, buflen);
1291 }
1292
1293 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1294 // for the same architecture as Hotspot is running on.
1295 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1296
1297 log_info(os)("attempting shared library load of %s", filename);
1298
1299 if (ebuf && ebuflen > 0) {
1300 ebuf[0] = '\0';
1301 ebuf[ebuflen - 1] = '\0';
1302 }
1303
1304 if (!filename || strlen(filename) == 0) {
1305 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1306 return NULL;
1307 }
1308
1309 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1310 void * result= ::dlopen(filename, RTLD_LAZY);
1311 if (result != NULL) {
1312 Events::log(NULL, "Loaded shared library %s", filename);
1313 // Reload dll cache. Don't do this in signal handling.
1314 LoadedLibraries::reload();
1315 log_info(os)("shared library load of %s was successful", filename);
1316 return result;
1317 } else {
1318 // error analysis when dlopen fails
1319 const char* error_report = ::dlerror();
1320 if (error_report == NULL) {
1321 error_report = "dlerror returned no error description";
1322 }
1323 if (ebuf != NULL && ebuflen > 0) {
1324 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1325 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1326 }
1327 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1328 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1329 }
1330 return NULL;
1331 }
1332
1333 void* os::dll_lookup(void* handle, const char* name) {
1334 void* res = dlsym(handle, name);
1335 return res;
1336 }
1337
1338 void* os::get_default_process_handle() {
1339 return (void*)::dlopen(NULL, RTLD_LAZY);
1340 }
1341
1342 void os::print_dll_info(outputStream *st) {
1343 st->print_cr("Dynamic libraries:");
1344 LoadedLibraries::print(st);
1345 }
1346
1347 void os::get_summary_os_info(char* buf, size_t buflen) {
1348 // There might be something more readable than uname results for AIX.
1349 struct utsname name;
1350 uname(&name);
1351 snprintf(buf, buflen, "%s %s", name.release, name.version);
1352 }
1353
1354 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1355 // Not yet implemented.
1356 return 0;
1357 }
1358
1359 void os::print_os_info_brief(outputStream* st) {
1360 uint32_t ver = os::Aix::os_version();
1361 st->print_cr("AIX kernel version %u.%u.%u.%u",
1362 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1363
1364 os::Posix::print_uname_info(st);
1365
1366 // Linux uses print_libversion_info(st); here.
1367 }
1368
1369 void os::print_os_info(outputStream* st) {
1370 st->print_cr("OS:");
1371
1372 os::Posix::print_uname_info(st);
1373
1374 uint32_t ver = os::Aix::os_version();
1375 st->print_cr("AIX kernel version %u.%u.%u.%u",
1376 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1377
1378 os::Posix::print_uptime_info(st);
1379
1380 os::Posix::print_rlimit_info(st);
1381
1382 os::Posix::print_load_average(st);
1383
1384 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process.
1385 long tmax = sysconf(_SC_THREAD_THREADS_MAX);
1386 st->print_cr("maximum #threads within a process:%ld", tmax);
1387
1388 // print wpar info
1389 libperfstat::wparinfo_t wi;
1390 if (libperfstat::get_wparinfo(&wi)) {
1391 st->print_cr("wpar info");
1392 st->print_cr("name: %s", wi.name);
1393 st->print_cr("id: %d", wi.wpar_id);
1394 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1395 }
1396
1397 VM_Version::print_platform_virtualization_info(st);
1398 }
1399
1400 void os::print_memory_info(outputStream* st) {
1401
1402 st->print_cr("Memory:");
1403
1404 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1405 describe_pagesize(g_multipage_support.pagesize));
1406 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1407 describe_pagesize(g_multipage_support.datapsize));
1408 st->print_cr(" Text page size: %s",
1409 describe_pagesize(g_multipage_support.textpsize));
1410 st->print_cr(" Thread stack page size (pthread): %s",
1411 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1412 st->print_cr(" Default shared memory page size: %s",
1413 describe_pagesize(g_multipage_support.shmpsize));
1414 st->print_cr(" Can use 64K pages dynamically with shared memory: %s",
1415 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1416 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1417 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1418 st->print_cr(" Multipage error: %d",
1419 g_multipage_support.error);
1420 st->cr();
1421 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1422
1423 // print out LDR_CNTRL because it affects the default page sizes
1424 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1425 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1426
1427 // Print out EXTSHM because it is an unsupported setting.
1428 const char* const extshm = ::getenv("EXTSHM");
1429 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1430 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1431 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1432 }
1433
1434 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1435 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1436 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1437 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1438 st->cr();
1439
1440 os::Aix::meminfo_t mi;
1441 if (os::Aix::get_meminfo(&mi)) {
1442 if (os::Aix::on_aix()) {
1443 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1444 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1445 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1446 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1447 } else {
1448 // PASE - Numbers are result of QWCRSSTS; they mean:
1449 // real_total: Sum of all system pools
1450 // real_free: always 0
1451 // pgsp_total: we take the size of the system ASP
1452 // pgsp_free: size of system ASP times percentage of system ASP unused
1453 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1454 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1455 st->print_cr("%% system asp used : %.2f",
1456 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1457 }
1458 }
1459 st->cr();
1460
1461 // Print program break.
1462 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1463 address brk_now = (address)::sbrk(0);
1464 if (brk_now != (address)-1) {
1465 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1466 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1467 }
1468 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1469 st->cr();
1470
1471 // Print segments allocated with os::reserve_memory.
1472 st->print_cr("internal virtual memory regions used by vm:");
1473 vmembk_print_on(st);
1474 }
1475
1476 // Get a string for the cpuinfo that is a summary of the cpu type
1477 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1478 // read _system_configuration.version
1479 switch (_system_configuration.version) {
1480 case PV_9:
1481 strncpy(buf, "Power PC 9", buflen);
1482 break;
1483 case PV_8:
1484 strncpy(buf, "Power PC 8", buflen);
1485 break;
1486 case PV_7:
1487 strncpy(buf, "Power PC 7", buflen);
1488 break;
1489 case PV_6_1:
1490 strncpy(buf, "Power PC 6 DD1.x", buflen);
1491 break;
1492 case PV_6:
1493 strncpy(buf, "Power PC 6", buflen);
1494 break;
1495 case PV_5:
1496 strncpy(buf, "Power PC 5", buflen);
1497 break;
1498 case PV_5_2:
1499 strncpy(buf, "Power PC 5_2", buflen);
1500 break;
1501 case PV_5_3:
1502 strncpy(buf, "Power PC 5_3", buflen);
1503 break;
1504 case PV_5_Compat:
1505 strncpy(buf, "PV_5_Compat", buflen);
1506 break;
1507 case PV_6_Compat:
1508 strncpy(buf, "PV_6_Compat", buflen);
1509 break;
1510 case PV_7_Compat:
1511 strncpy(buf, "PV_7_Compat", buflen);
1512 break;
1513 case PV_8_Compat:
1514 strncpy(buf, "PV_8_Compat", buflen);
1515 break;
1516 case PV_9_Compat:
1517 strncpy(buf, "PV_9_Compat", buflen);
1518 break;
1519 default:
1520 strncpy(buf, "unknown", buflen);
1521 }
1522 }
1523
1524 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1525 // Nothing to do beyond of what os::print_cpu_info() does.
1526 }
1527
1528 static void print_signal_handler(outputStream* st, int sig,
1529 char* buf, size_t buflen);
1530
1531 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1532 st->print_cr("Signal Handlers:");
1533 print_signal_handler(st, SIGSEGV, buf, buflen);
1534 print_signal_handler(st, SIGBUS , buf, buflen);
1535 print_signal_handler(st, SIGFPE , buf, buflen);
1536 print_signal_handler(st, SIGPIPE, buf, buflen);
1537 print_signal_handler(st, SIGXFSZ, buf, buflen);
1538 print_signal_handler(st, SIGILL , buf, buflen);
1539 print_signal_handler(st, SR_signum, buf, buflen);
1540 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1541 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1542 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1543 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1544 print_signal_handler(st, SIGTRAP, buf, buflen);
1545 // We also want to know if someone else adds a SIGDANGER handler because
1546 // that will interfere with OOM killling.
1547 print_signal_handler(st, SIGDANGER, buf, buflen);
1548 }
1549
1550 static char saved_jvm_path[MAXPATHLEN] = {0};
1551
1552 // Find the full path to the current module, libjvm.so.
1553 void os::jvm_path(char *buf, jint buflen) {
1554 // Error checking.
1555 if (buflen < MAXPATHLEN) {
1556 assert(false, "must use a large-enough buffer");
1557 buf[0] = '\0';
1558 return;
1559 }
1560 // Lazy resolve the path to current module.
1561 if (saved_jvm_path[0] != 0) {
1562 strcpy(buf, saved_jvm_path);
1563 return;
1564 }
1565
1566 Dl_info dlinfo;
1567 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1568 assert(ret != 0, "cannot locate libjvm");
1569 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1570 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1571
1572 if (Arguments::sun_java_launcher_is_altjvm()) {
1573 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1574 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1575 // If "/jre/lib/" appears at the right place in the string, then
1576 // assume we are installed in a JDK and we're done. Otherwise, check
1577 // for a JAVA_HOME environment variable and fix up the path so it
1578 // looks like libjvm.so is installed there (append a fake suffix
1579 // hotspot/libjvm.so).
1580 const char *p = buf + strlen(buf) - 1;
1581 for (int count = 0; p > buf && count < 4; ++count) {
1582 for (--p; p > buf && *p != '/'; --p)
1583 /* empty */ ;
1584 }
1585
1586 if (strncmp(p, "/jre/lib/", 9) != 0) {
1587 // Look for JAVA_HOME in the environment.
1588 char* java_home_var = ::getenv("JAVA_HOME");
1589 if (java_home_var != NULL && java_home_var[0] != 0) {
1590 char* jrelib_p;
1591 int len;
1592
1593 // Check the current module name "libjvm.so".
1594 p = strrchr(buf, '/');
1595 if (p == NULL) {
1596 return;
1597 }
1598 assert(strstr(p, "/libjvm") == p, "invalid library name");
1599
1600 rp = os::Posix::realpath(java_home_var, buf, buflen);
1601 if (rp == NULL) {
1602 return;
1603 }
1604
1605 // determine if this is a legacy image or modules image
1606 // modules image doesn't have "jre" subdirectory
1607 len = strlen(buf);
1608 assert(len < buflen, "Ran out of buffer room");
1609 jrelib_p = buf + len;
1610 snprintf(jrelib_p, buflen-len, "/jre/lib");
1611 if (0 != access(buf, F_OK)) {
1612 snprintf(jrelib_p, buflen-len, "/lib");
1613 }
1614
1615 if (0 == access(buf, F_OK)) {
1616 // Use current module name "libjvm.so"
1617 len = strlen(buf);
1618 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1619 } else {
1620 // Go back to path of .so
1621 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1622 if (rp == NULL) {
1623 return;
1624 }
1625 }
1626 }
1627 }
1628 }
1629
1630 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1631 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1632 }
1633
1634 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1635 // no prefix required, not even "_"
1636 }
1637
1638 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1639 // no suffix required
1640 }
1641
1642 ////////////////////////////////////////////////////////////////////////////////
1643 // sun.misc.Signal support
1644
1645 static void
1646 UserHandler(int sig, void *siginfo, void *context) {
1647 // Ctrl-C is pressed during error reporting, likely because the error
1648 // handler fails to abort. Let VM die immediately.
1649 if (sig == SIGINT && VMError::is_error_reported()) {
1650 os::die();
1651 }
1652
1653 os::signal_notify(sig);
1654 }
1655
1656 void* os::user_handler() {
1657 return CAST_FROM_FN_PTR(void*, UserHandler);
1658 }
1659
1660 extern "C" {
1661 typedef void (*sa_handler_t)(int);
1662 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1663 }
1664
1665 void* os::signal(int signal_number, void* handler) {
1666 struct sigaction sigAct, oldSigAct;
1667
1668 sigfillset(&(sigAct.sa_mask));
1669
1670 // Do not block out synchronous signals in the signal handler.
1671 // Blocking synchronous signals only makes sense if you can really
1672 // be sure that those signals won't happen during signal handling,
1673 // when the blocking applies. Normal signal handlers are lean and
1674 // do not cause signals. But our signal handlers tend to be "risky"
1675 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1676 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1677 // by a SIGILL, which was blocked due to the signal mask. The process
1678 // just hung forever. Better to crash from a secondary signal than to hang.
1679 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1680 sigdelset(&(sigAct.sa_mask), SIGBUS);
1681 sigdelset(&(sigAct.sa_mask), SIGILL);
1682 sigdelset(&(sigAct.sa_mask), SIGFPE);
1683 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1684
1685 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1686
1687 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1688
1689 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1690 // -1 means registration failed
1691 return (void *)-1;
1692 }
1693
1694 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1695 }
1696
1697 void os::signal_raise(int signal_number) {
1698 ::raise(signal_number);
1699 }
1700
1701 //
1702 // The following code is moved from os.cpp for making this
1703 // code platform specific, which it is by its very nature.
1704 //
1705
1706 // Will be modified when max signal is changed to be dynamic
1707 int os::sigexitnum_pd() {
1708 return NSIG;
1709 }
1710
1711 // a counter for each possible signal value
1712 static volatile jint pending_signals[NSIG+1] = { 0 };
1713
1714 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1715 // On AIX, we use sem_init(), sem_post(), sem_wait()
1716 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1717 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1718 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1719 // on AIX, msem_..() calls are suspected of causing problems.
1720 static sem_t sig_sem;
1721 static msemaphore* p_sig_msem = 0;
1722
1723 static void local_sem_init() {
1724 if (os::Aix::on_aix()) {
1725 int rc = ::sem_init(&sig_sem, 0, 0);
1726 guarantee(rc != -1, "sem_init failed");
1727 } else {
1728 // Memory semaphores must live in shared mem.
1729 guarantee0(p_sig_msem == NULL);
1730 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1731 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1732 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1733 }
1734 }
1735
1736 static void local_sem_post() {
1737 static bool warn_only_once = false;
1738 if (os::Aix::on_aix()) {
1739 int rc = ::sem_post(&sig_sem);
1740 if (rc == -1 && !warn_only_once) {
1741 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1742 warn_only_once = true;
1743 }
1744 } else {
1745 guarantee0(p_sig_msem != NULL);
1746 int rc = ::msem_unlock(p_sig_msem, 0);
1747 if (rc == -1 && !warn_only_once) {
1748 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1749 warn_only_once = true;
1750 }
1751 }
1752 }
1753
1754 static void local_sem_wait() {
1755 static bool warn_only_once = false;
1756 if (os::Aix::on_aix()) {
1757 int rc = ::sem_wait(&sig_sem);
1758 if (rc == -1 && !warn_only_once) {
1759 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1760 warn_only_once = true;
1761 }
1762 } else {
1763 guarantee0(p_sig_msem != NULL); // must init before use
1764 int rc = ::msem_lock(p_sig_msem, 0);
1765 if (rc == -1 && !warn_only_once) {
1766 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1767 warn_only_once = true;
1768 }
1769 }
1770 }
1771
1772 static void jdk_misc_signal_init() {
1773 // Initialize signal structures
1774 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1775
1776 // Initialize signal semaphore
1777 local_sem_init();
1778 }
1779
1780 void os::signal_notify(int sig) {
1781 Atomic::inc(&pending_signals[sig]);
1782 local_sem_post();
1783 }
1784
1785 static int check_pending_signals() {
1786 for (;;) {
1787 for (int i = 0; i < NSIG + 1; i++) {
1788 jint n = pending_signals[i];
1789 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1790 return i;
1791 }
1792 }
1793 JavaThread *thread = JavaThread::current();
1794 ThreadBlockInVM tbivm(thread);
1795
1796 bool threadIsSuspended;
1797 do {
1798 thread->set_suspend_equivalent();
1799 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1800
1801 local_sem_wait();
1802
1803 // were we externally suspended while we were waiting?
1804 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1805 if (threadIsSuspended) {
1806 //
1807 // The semaphore has been incremented, but while we were waiting
1808 // another thread suspended us. We don't want to continue running
1809 // while suspended because that would surprise the thread that
1810 // suspended us.
1811 //
1812
1813 local_sem_post();
1814
1815 thread->java_suspend_self();
1816 }
1817 } while (threadIsSuspended);
1818 }
1819 }
1820
1821 int os::signal_wait() {
1822 return check_pending_signals();
1823 }
1824
1825 ////////////////////////////////////////////////////////////////////////////////
1826 // Virtual Memory
1827
1828 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1829
1830 #define VMEM_MAPPED 1
1831 #define VMEM_SHMATED 2
1832
1833 struct vmembk_t {
1834 int type; // 1 - mmap, 2 - shmat
1835 char* addr;
1836 size_t size; // Real size, may be larger than usersize.
1837 size_t pagesize; // page size of area
1838 vmembk_t* next;
1839
1840 bool contains_addr(char* p) const {
1841 return p >= addr && p < (addr + size);
1842 }
1843
1844 bool contains_range(char* p, size_t s) const {
1845 return contains_addr(p) && contains_addr(p + s - 1);
1846 }
1847
1848 void print_on(outputStream* os) const {
1849 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1850 " bytes, %d %s pages), %s",
1851 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1852 (type == VMEM_SHMATED ? "shmat" : "mmap")
1853 );
1854 }
1855
1856 // Check that range is a sub range of memory block (or equal to memory block);
1857 // also check that range is fully page aligned to the page size if the block.
1858 void assert_is_valid_subrange(char* p, size_t s) const {
1859 if (!contains_range(p, s)) {
1860 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1861 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1862 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size));
1863 guarantee0(false);
1864 }
1865 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1866 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1867 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize);
1868 guarantee0(false);
1869 }
1870 }
1871 };
1872
1873 static struct {
1874 vmembk_t* first;
1875 MiscUtils::CritSect cs;
1876 } vmem;
1877
1878 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1879 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1880 assert0(p);
1881 if (p) {
1882 MiscUtils::AutoCritSect lck(&vmem.cs);
1883 p->addr = addr; p->size = size;
1884 p->pagesize = pagesize;
1885 p->type = type;
1886 p->next = vmem.first;
1887 vmem.first = p;
1888 }
1889 }
1890
1891 static vmembk_t* vmembk_find(char* addr) {
1892 MiscUtils::AutoCritSect lck(&vmem.cs);
1893 for (vmembk_t* p = vmem.first; p; p = p->next) {
1894 if (p->addr <= addr && (p->addr + p->size) > addr) {
1895 return p;
1896 }
1897 }
1898 return NULL;
1899 }
1900
1901 static void vmembk_remove(vmembk_t* p0) {
1902 MiscUtils::AutoCritSect lck(&vmem.cs);
1903 assert0(p0);
1904 assert0(vmem.first); // List should not be empty.
1905 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1906 if (*pp == p0) {
1907 *pp = p0->next;
1908 ::free(p0);
1909 return;
1910 }
1911 }
1912 assert0(false); // Not found?
1913 }
1914
1915 static void vmembk_print_on(outputStream* os) {
1916 MiscUtils::AutoCritSect lck(&vmem.cs);
1917 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1918 vmi->print_on(os);
1919 os->cr();
1920 }
1921 }
1922
1923 // Reserve and attach a section of System V memory.
1924 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1925 // address. Failing that, it will attach the memory anywhere.
1926 // If <requested_addr> is NULL, function will attach the memory anywhere.
1927 //
1928 // <alignment_hint> is being ignored by this function. It is very probable however that the
1929 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1930 // Should this be not enogh, we can put more work into it.
1931 static char* reserve_shmated_memory (
1932 size_t bytes,
1933 char* requested_addr,
1934 size_t alignment_hint) {
1935
1936 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1937 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1938 bytes, p2i(requested_addr), alignment_hint);
1939
1940 // Either give me wish address or wish alignment but not both.
1941 assert0(!(requested_addr != NULL && alignment_hint != 0));
1942
1943 // We must prevent anyone from attaching too close to the
1944 // BRK because that may cause malloc OOM.
1945 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1946 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1947 "Will attach anywhere.", p2i(requested_addr));
1948 // Act like the OS refused to attach there.
1949 requested_addr = NULL;
1950 }
1951
1952 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1953 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1954 if (os::Aix::on_pase_V5R4_or_older()) {
1955 ShouldNotReachHere();
1956 }
1957
1958 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1959 const size_t size = align_up(bytes, 64*K);
1960
1961 // Reserve the shared segment.
1962 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1963 if (shmid == -1) {
1964 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1965 return NULL;
1966 }
1967
1968 // Important note:
1969 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1970 // We must right after attaching it remove it from the system. System V shm segments are global and
1971 // survive the process.
1972 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1973
1974 struct shmid_ds shmbuf;
1975 memset(&shmbuf, 0, sizeof(shmbuf));
1976 shmbuf.shm_pagesize = 64*K;
1977 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1978 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1979 size / (64*K), errno);
1980 // I want to know if this ever happens.
1981 assert(false, "failed to set page size for shmat");
1982 }
1983
1984 // Now attach the shared segment.
1985 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1986 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1987 // were not a segment boundary.
1988 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1989 const int errno_shmat = errno;
1990
1991 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1992 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1993 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1994 assert(false, "failed to remove shared memory segment!");
1995 }
1996
1997 // Handle shmat error. If we failed to attach, just return.
1998 if (addr == (char*)-1) {
1999 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat);
2000 return NULL;
2001 }
2002
2003 // Just for info: query the real page size. In case setting the page size did not
2004 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2005 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2006 if (real_pagesize != shmbuf.shm_pagesize) {
2007 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize);
2008 }
2009
2010 if (addr) {
2011 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2012 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize));
2013 } else {
2014 if (requested_addr != NULL) {
2015 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr));
2016 } else {
2017 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2018 }
2019 }
2020
2021 // book-keeping
2022 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2023 assert0(is_aligned_to(addr, os::vm_page_size()));
2024
2025 return addr;
2026 }
2027
2028 static bool release_shmated_memory(char* addr, size_t size) {
2029
2030 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2031 p2i(addr), p2i(addr + size - 1));
2032
2033 bool rc = false;
2034
2035 // TODO: is there a way to verify shm size without doing bookkeeping?
2036 if (::shmdt(addr) != 0) {
2037 trcVerbose("error (%d).", errno);
2038 } else {
2039 trcVerbose("ok.");
2040 rc = true;
2041 }
2042 return rc;
2043 }
2044
2045 static bool uncommit_shmated_memory(char* addr, size_t size) {
2046 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2047 p2i(addr), p2i(addr + size - 1));
2048
2049 const bool rc = my_disclaim64(addr, size);
2050
2051 if (!rc) {
2052 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size);
2053 return false;
2054 }
2055 return true;
2056 }
2057
2058 //////////////////////////////// mmap-based routines /////////////////////////////////
2059
2060 // Reserve memory via mmap.
2061 // If <requested_addr> is given, an attempt is made to attach at the given address.
2062 // Failing that, memory is allocated at any address.
2063 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2064 // allocate at an address aligned with the given alignment. Failing that, memory
2065 // is aligned anywhere.
2066 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2067 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2068 "alignment_hint " UINTX_FORMAT "...",
2069 bytes, p2i(requested_addr), alignment_hint);
2070
2071 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2072 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2073 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr));
2074 return NULL;
2075 }
2076
2077 // We must prevent anyone from attaching too close to the
2078 // BRK because that may cause malloc OOM.
2079 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2080 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2081 "Will attach anywhere.", p2i(requested_addr));
2082 // Act like the OS refused to attach there.
2083 requested_addr = NULL;
2084 }
2085
2086 // Specify one or the other but not both.
2087 assert0(!(requested_addr != NULL && alignment_hint > 0));
2088
2089 // In 64K mode, we claim the global page size (os::vm_page_size())
2090 // is 64K. This is one of the few points where that illusion may
2091 // break, because mmap() will always return memory aligned to 4K. So
2092 // we must ensure we only ever return memory aligned to 64k.
2093 if (alignment_hint) {
2094 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2095 } else {
2096 alignment_hint = os::vm_page_size();
2097 }
2098
2099 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2100 const size_t size = align_up(bytes, os::vm_page_size());
2101
2102 // alignment: Allocate memory large enough to include an aligned range of the right size and
2103 // cut off the leading and trailing waste pages.
2104 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2105 const size_t extra_size = size + alignment_hint;
2106
2107 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2108 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2109 int flags = MAP_ANONYMOUS | MAP_SHARED;
2110
2111 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2112 // it means if wishaddress is given but MAP_FIXED is not set.
2113 //
2114 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2115 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2116 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2117 // get clobbered.
2118 if (requested_addr != NULL) {
2119 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2120 flags |= MAP_FIXED;
2121 }
2122 }
2123
2124 char* addr = (char*)::mmap(requested_addr, extra_size,
2125 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2126
2127 if (addr == MAP_FAILED) {
2128 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno);
2129 return NULL;
2130 }
2131
2132 // Handle alignment.
2133 char* const addr_aligned = align_up(addr, alignment_hint);
2134 const size_t waste_pre = addr_aligned - addr;
2135 char* const addr_aligned_end = addr_aligned + size;
2136 const size_t waste_post = extra_size - waste_pre - size;
2137 if (waste_pre > 0) {
2138 ::munmap(addr, waste_pre);
2139 }
2140 if (waste_post > 0) {
2141 ::munmap(addr_aligned_end, waste_post);
2142 }
2143 addr = addr_aligned;
2144
2145 if (addr) {
2146 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2147 p2i(addr), p2i(addr + bytes), bytes);
2148 } else {
2149 if (requested_addr != NULL) {
2150 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr));
2151 } else {
2152 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2153 }
2154 }
2155
2156 // bookkeeping
2157 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2158
2159 // Test alignment, see above.
2160 assert0(is_aligned_to(addr, os::vm_page_size()));
2161
2162 return addr;
2163 }
2164
2165 static bool release_mmaped_memory(char* addr, size_t size) {
2166 assert0(is_aligned_to(addr, os::vm_page_size()));
2167 assert0(is_aligned_to(size, os::vm_page_size()));
2168
2169 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2170 p2i(addr), p2i(addr + size - 1));
2171 bool rc = false;
2172
2173 if (::munmap(addr, size) != 0) {
2174 trcVerbose("failed (%d)\n", errno);
2175 rc = false;
2176 } else {
2177 trcVerbose("ok.");
2178 rc = true;
2179 }
2180
2181 return rc;
2182 }
2183
2184 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2185
2186 assert0(is_aligned_to(addr, os::vm_page_size()));
2187 assert0(is_aligned_to(size, os::vm_page_size()));
2188
2189 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2190 p2i(addr), p2i(addr + size - 1));
2191 bool rc = false;
2192
2193 // Uncommit mmap memory with msync MS_INVALIDATE.
2194 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2195 trcVerbose("failed (%d)\n", errno);
2196 rc = false;
2197 } else {
2198 trcVerbose("ok.");
2199 rc = true;
2200 }
2201
2202 return rc;
2203 }
2204
2205 int os::vm_page_size() {
2206 // Seems redundant as all get out.
2207 assert(os::Aix::page_size() != -1, "must call os::init");
2208 return os::Aix::page_size();
2209 }
2210
2211 // Aix allocates memory by pages.
2212 int os::vm_allocation_granularity() {
2213 assert(os::Aix::page_size() != -1, "must call os::init");
2214 return os::Aix::page_size();
2215 }
2216
2217 #ifdef PRODUCT
2218 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2219 int err) {
2220 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2221 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec,
2222 os::errno_name(err), err);
2223 }
2224 #endif
2225
2226 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2227 const char* mesg) {
2228 assert(mesg != NULL, "mesg must be specified");
2229 if (!pd_commit_memory(addr, size, exec)) {
2230 // Add extra info in product mode for vm_exit_out_of_memory():
2231 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2232 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2233 }
2234 }
2235
2236 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2237
2238 assert(is_aligned_to(addr, os::vm_page_size()),
2239 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2240 p2i(addr), os::vm_page_size());
2241 assert(is_aligned_to(size, os::vm_page_size()),
2242 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2243 size, os::vm_page_size());
2244
2245 vmembk_t* const vmi = vmembk_find(addr);
2246 guarantee0(vmi);
2247 vmi->assert_is_valid_subrange(addr, size);
2248
2249 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1));
2250
2251 if (UseExplicitCommit) {
2252 // AIX commits memory on touch. So, touch all pages to be committed.
2253 for (char* p = addr; p < (addr + size); p += 4*K) {
2254 *p = '\0';
2255 }
2256 }
2257
2258 return true;
2259 }
2260
2261 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2262 return pd_commit_memory(addr, size, exec);
2263 }
2264
2265 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2266 size_t alignment_hint, bool exec,
2267 const char* mesg) {
2268 // Alignment_hint is ignored on this OS.
2269 pd_commit_memory_or_exit(addr, size, exec, mesg);
2270 }
2271
2272 bool os::pd_uncommit_memory(char* addr, size_t size) {
2273 assert(is_aligned_to(addr, os::vm_page_size()),
2274 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2275 p2i(addr), os::vm_page_size());
2276 assert(is_aligned_to(size, os::vm_page_size()),
2277 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2278 size, os::vm_page_size());
2279
2280 // Dynamically do different things for mmap/shmat.
2281 const vmembk_t* const vmi = vmembk_find(addr);
2282 guarantee0(vmi);
2283 vmi->assert_is_valid_subrange(addr, size);
2284
2285 if (vmi->type == VMEM_SHMATED) {
2286 return uncommit_shmated_memory(addr, size);
2287 } else {
2288 return uncommit_mmaped_memory(addr, size);
2289 }
2290 }
2291
2292 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2293 // Do not call this; no need to commit stack pages on AIX.
2294 ShouldNotReachHere();
2295 return true;
2296 }
2297
2298 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2299 // Do not call this; no need to commit stack pages on AIX.
2300 ShouldNotReachHere();
2301 return true;
2302 }
2303
2304 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2305 }
2306
2307 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2308 }
2309
2310 void os::numa_make_global(char *addr, size_t bytes) {
2311 }
2312
2313 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2314 }
2315
2316 bool os::numa_topology_changed() {
2317 return false;
2318 }
2319
2320 size_t os::numa_get_groups_num() {
2321 return 1;
2322 }
2323
2324 int os::numa_get_group_id() {
2325 return 0;
2326 }
2327
2328 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2329 if (size > 0) {
2330 ids[0] = 0;
2331 return 1;
2332 }
2333 return 0;
2334 }
2335
2336 int os::numa_get_group_id_for_address(const void* address) {
2337 return 0;
2338 }
2339
2340 bool os::get_page_info(char *start, page_info* info) {
2341 return false;
2342 }
2343
2344 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2345 return end;
2346 }
2347
2348 // Reserves and attaches a shared memory segment.
2349 // Will assert if a wish address is given and could not be obtained.
2350 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2351
2352 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2353 // thereby clobbering old mappings at that place. That is probably
2354 // not intended, never used and almost certainly an error were it
2355 // ever be used this way (to try attaching at a specified address
2356 // without clobbering old mappings an alternate API exists,
2357 // os::attempt_reserve_memory_at()).
2358 // Instead of mimicking the dangerous coding of the other platforms, here I
2359 // just ignore the request address (release) or assert(debug).
2360 assert0(requested_addr == NULL);
2361
2362 // Always round to os::vm_page_size(), which may be larger than 4K.
2363 bytes = align_up(bytes, os::vm_page_size());
2364 const size_t alignment_hint0 =
2365 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2366
2367 // In 4K mode always use mmap.
2368 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2369 if (os::vm_page_size() == 4*K) {
2370 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2371 } else {
2372 if (bytes >= Use64KPagesThreshold) {
2373 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2374 } else {
2375 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2376 }
2377 }
2378 }
2379
2380 bool os::pd_release_memory(char* addr, size_t size) {
2381
2382 // Dynamically do different things for mmap/shmat.
2383 vmembk_t* const vmi = vmembk_find(addr);
2384 guarantee0(vmi);
2385
2386 // Always round to os::vm_page_size(), which may be larger than 4K.
2387 size = align_up(size, os::vm_page_size());
2388 addr = align_up(addr, os::vm_page_size());
2389
2390 bool rc = false;
2391 bool remove_bookkeeping = false;
2392 if (vmi->type == VMEM_SHMATED) {
2393 // For shmatted memory, we do:
2394 // - If user wants to release the whole range, release the memory (shmdt).
2395 // - If user only wants to release a partial range, uncommit (disclaim) that
2396 // range. That way, at least, we do not use memory anymore (bust still page
2397 // table space).
2398 vmi->assert_is_valid_subrange(addr, size);
2399 if (addr == vmi->addr && size == vmi->size) {
2400 rc = release_shmated_memory(addr, size);
2401 remove_bookkeeping = true;
2402 } else {
2403 rc = uncommit_shmated_memory(addr, size);
2404 }
2405 } else {
2406 // User may unmap partial regions but region has to be fully contained.
2407 #ifdef ASSERT
2408 vmi->assert_is_valid_subrange(addr, size);
2409 #endif
2410 rc = release_mmaped_memory(addr, size);
2411 remove_bookkeeping = true;
2412 }
2413
2414 // update bookkeeping
2415 if (rc && remove_bookkeeping) {
2416 vmembk_remove(vmi);
2417 }
2418
2419 return rc;
2420 }
2421
2422 static bool checked_mprotect(char* addr, size_t size, int prot) {
2423
2424 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2425 // not tell me if protection failed when trying to protect an un-protectable range.
2426 //
2427 // This means if the memory was allocated using shmget/shmat, protection wont work
2428 // but mprotect will still return 0:
2429 //
2430 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2431
2432 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2433 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2434
2435 if (!rc) {
2436 const char* const s_errno = os::errno_name(errno);
2437 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2438 return false;
2439 }
2440
2441 // mprotect success check
2442 //
2443 // Mprotect said it changed the protection but can I believe it?
2444 //
2445 // To be sure I need to check the protection afterwards. Try to
2446 // read from protected memory and check whether that causes a segfault.
2447 //
2448 if (!os::Aix::xpg_sus_mode()) {
2449
2450 if (CanUseSafeFetch32()) {
2451
2452 const bool read_protected =
2453 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2454 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2455
2456 if (prot & PROT_READ) {
2457 rc = !read_protected;
2458 } else {
2459 rc = read_protected;
2460 }
2461
2462 if (!rc) {
2463 if (os::Aix::on_pase()) {
2464 // There is an issue on older PASE systems where mprotect() will return success but the
2465 // memory will not be protected.
2466 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2467 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2468 // a stack. It is an OS error.
2469 //
2470 // A valid strategy is just to try again. This usually works. :-/
2471
2472 ::usleep(1000);
2473 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2474 if (::mprotect(addr, size, prot) == 0) {
2475 const bool read_protected_2 =
2476 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2477 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2478 rc = true;
2479 }
2480 }
2481 }
2482 }
2483 }
2484
2485 assert(rc == true, "mprotect failed.");
2486
2487 return rc;
2488 }
2489
2490 // Set protections specified
2491 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2492 unsigned int p = 0;
2493 switch (prot) {
2494 case MEM_PROT_NONE: p = PROT_NONE; break;
2495 case MEM_PROT_READ: p = PROT_READ; break;
2496 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2497 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2498 default:
2499 ShouldNotReachHere();
2500 }
2501 // is_committed is unused.
2502 return checked_mprotect(addr, size, p);
2503 }
2504
2505 bool os::guard_memory(char* addr, size_t size) {
2506 return checked_mprotect(addr, size, PROT_NONE);
2507 }
2508
2509 bool os::unguard_memory(char* addr, size_t size) {
2510 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2511 }
2512
2513 // Large page support
2514
2515 static size_t _large_page_size = 0;
2516
2517 // Enable large page support if OS allows that.
2518 void os::large_page_init() {
2519 return; // Nothing to do. See query_multipage_support and friends.
2520 }
2521
2522 char* os::pd_reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2523 fatal("os::reserve_memory_special should not be called on AIX.");
2524 return NULL;
2525 }
2526
2527 bool os::pd_release_memory_special(char* base, size_t bytes) {
2528 fatal("os::release_memory_special should not be called on AIX.");
2529 return false;
2530 }
2531
2532 size_t os::large_page_size() {
2533 return _large_page_size;
2534 }
2535
2536 bool os::can_commit_large_page_memory() {
2537 // Does not matter, we do not support huge pages.
2538 return false;
2539 }
2540
2541 bool os::can_execute_large_page_memory() {
2542 // Does not matter, we do not support huge pages.
2543 return false;
2544 }
2545
2546 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2547 assert(file_desc >= 0, "file_desc is not valid");
2548 char* result = NULL;
2549
2550 // Always round to os::vm_page_size(), which may be larger than 4K.
2551 bytes = align_up(bytes, os::vm_page_size());
2552 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2553
2554 if (result != NULL) {
2555 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2556 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2557 }
2558 }
2559 return result;
2560 }
2561
2562 // Reserve memory at an arbitrary address, only if that area is
2563 // available (and not reserved for something else).
2564 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2565 char* addr = NULL;
2566
2567 // Always round to os::vm_page_size(), which may be larger than 4K.
2568 bytes = align_up(bytes, os::vm_page_size());
2569
2570 // In 4K mode always use mmap.
2571 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2572 if (os::vm_page_size() == 4*K) {
2573 return reserve_mmaped_memory(bytes, requested_addr, 0);
2574 } else {
2575 if (bytes >= Use64KPagesThreshold) {
2576 return reserve_shmated_memory(bytes, requested_addr, 0);
2577 } else {
2578 return reserve_mmaped_memory(bytes, requested_addr, 0);
2579 }
2580 }
2581
2582 return addr;
2583 }
2584
2585 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2586 void os::infinite_sleep() {
2587 while (true) { // sleep forever ...
2588 ::sleep(100); // ... 100 seconds at a time
2589 }
2590 }
2591
2592 // Used to convert frequent JVM_Yield() to nops
2593 bool os::dont_yield() {
2594 return DontYieldALot;
2595 }
2596
2597 void os::naked_yield() {
2598 sched_yield();
2599 }
2600
2601 ////////////////////////////////////////////////////////////////////////////////
2602 // thread priority support
2603
2604 // From AIX manpage to pthread_setschedparam
2605 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2606 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2607 //
2608 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2609 // range from 40 to 80, where 40 is the least favored priority and 80
2610 // is the most favored."
2611 //
2612 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2613 // scheduling there; however, this still leaves iSeries.)
2614 //
2615 // We use the same values for AIX and PASE.
2616 int os::java_to_os_priority[CriticalPriority + 1] = {
2617 54, // 0 Entry should never be used
2618
2619 55, // 1 MinPriority
2620 55, // 2
2621 56, // 3
2622
2623 56, // 4
2624 57, // 5 NormPriority
2625 57, // 6
2626
2627 58, // 7
2628 58, // 8
2629 59, // 9 NearMaxPriority
2630
2631 60, // 10 MaxPriority
2632
2633 60 // 11 CriticalPriority
2634 };
2635
2636 static int prio_init() {
2637 if (ThreadPriorityPolicy == 1) {
2638 if (geteuid() != 0) {
2639 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy) && !FLAG_IS_JIMAGE_RESOURCE(ThreadPriorityPolicy)) {
2640 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2641 "e.g., being the root user. If the necessary permission is not " \
2642 "possessed, changes to priority will be silently ignored.");
2643 }
2644 }
2645 }
2646 if (UseCriticalJavaThreadPriority) {
2647 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2648 }
2649 return 0;
2650 }
2651
2652 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2653 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2654 pthread_t thr = thread->osthread()->pthread_id();
2655 int policy = SCHED_OTHER;
2656 struct sched_param param;
2657 param.sched_priority = newpri;
2658 int ret = pthread_setschedparam(thr, policy, ¶m);
2659
2660 if (ret != 0) {
2661 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2662 (int)thr, newpri, ret, os::errno_name(ret));
2663 }
2664 return (ret == 0) ? OS_OK : OS_ERR;
2665 }
2666
2667 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2668 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2669 *priority_ptr = java_to_os_priority[NormPriority];
2670 return OS_OK;
2671 }
2672 pthread_t thr = thread->osthread()->pthread_id();
2673 int policy = SCHED_OTHER;
2674 struct sched_param param;
2675 int ret = pthread_getschedparam(thr, &policy, ¶m);
2676 *priority_ptr = param.sched_priority;
2677
2678 return (ret == 0) ? OS_OK : OS_ERR;
2679 }
2680
2681 ////////////////////////////////////////////////////////////////////////////////
2682 // suspend/resume support
2683
2684 // The low-level signal-based suspend/resume support is a remnant from the
2685 // old VM-suspension that used to be for java-suspension, safepoints etc,
2686 // within hotspot. Currently used by JFR's OSThreadSampler
2687 //
2688 // The remaining code is greatly simplified from the more general suspension
2689 // code that used to be used.
2690 //
2691 // The protocol is quite simple:
2692 // - suspend:
2693 // - sends a signal to the target thread
2694 // - polls the suspend state of the osthread using a yield loop
2695 // - target thread signal handler (SR_handler) sets suspend state
2696 // and blocks in sigsuspend until continued
2697 // - resume:
2698 // - sets target osthread state to continue
2699 // - sends signal to end the sigsuspend loop in the SR_handler
2700 //
2701 // Note that the SR_lock plays no role in this suspend/resume protocol,
2702 // but is checked for NULL in SR_handler as a thread termination indicator.
2703 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2704 //
2705 // Note that resume_clear_context() and suspend_save_context() are needed
2706 // by SR_handler(), so that fetch_frame_from_context() works,
2707 // which in part is used by:
2708 // - Forte Analyzer: AsyncGetCallTrace()
2709 // - StackBanging: get_frame_at_stack_banging_point()
2710
2711 static void resume_clear_context(OSThread *osthread) {
2712 osthread->set_ucontext(NULL);
2713 osthread->set_siginfo(NULL);
2714 }
2715
2716 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2717 osthread->set_ucontext(context);
2718 osthread->set_siginfo(siginfo);
2719 }
2720
2721 //
2722 // Handler function invoked when a thread's execution is suspended or
2723 // resumed. We have to be careful that only async-safe functions are
2724 // called here (Note: most pthread functions are not async safe and
2725 // should be avoided.)
2726 //
2727 // Note: sigwait() is a more natural fit than sigsuspend() from an
2728 // interface point of view, but sigwait() prevents the signal hander
2729 // from being run. libpthread would get very confused by not having
2730 // its signal handlers run and prevents sigwait()'s use with the
2731 // mutex granting granting signal.
2732 //
2733 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2734 //
2735 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2736 // Save and restore errno to avoid confusing native code with EINTR
2737 // after sigsuspend.
2738 int old_errno = errno;
2739
2740 Thread* thread = Thread::current_or_null_safe();
2741 assert(thread != NULL, "Missing current thread in SR_handler");
2742
2743 // On some systems we have seen signal delivery get "stuck" until the signal
2744 // mask is changed as part of thread termination. Check that the current thread
2745 // has not already terminated (via SR_lock()) - else the following assertion
2746 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2747 // destructor has completed.
2748
2749 if (thread->SR_lock() == NULL) {
2750 return;
2751 }
2752
2753 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2754
2755 OSThread* osthread = thread->osthread();
2756
2757 os::SuspendResume::State current = osthread->sr.state();
2758 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2759 suspend_save_context(osthread, siginfo, context);
2760
2761 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2762 os::SuspendResume::State state = osthread->sr.suspended();
2763 if (state == os::SuspendResume::SR_SUSPENDED) {
2764 sigset_t suspend_set; // signals for sigsuspend()
2765 sigemptyset(&suspend_set);
2766 // get current set of blocked signals and unblock resume signal
2767 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2768 sigdelset(&suspend_set, SR_signum);
2769
2770 // wait here until we are resumed
2771 while (1) {
2772 sigsuspend(&suspend_set);
2773
2774 os::SuspendResume::State result = osthread->sr.running();
2775 if (result == os::SuspendResume::SR_RUNNING) {
2776 break;
2777 }
2778 }
2779
2780 } else if (state == os::SuspendResume::SR_RUNNING) {
2781 // request was cancelled, continue
2782 } else {
2783 ShouldNotReachHere();
2784 }
2785
2786 resume_clear_context(osthread);
2787 } else if (current == os::SuspendResume::SR_RUNNING) {
2788 // request was cancelled, continue
2789 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2790 // ignore
2791 } else {
2792 ShouldNotReachHere();
2793 }
2794
2795 errno = old_errno;
2796 }
2797
2798 static int SR_initialize() {
2799 struct sigaction act;
2800 char *s;
2801 // Get signal number to use for suspend/resume
2802 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2803 int sig = ::strtol(s, 0, 10);
2804 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2805 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2806 SR_signum = sig;
2807 } else {
2808 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2809 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2810 }
2811 }
2812
2813 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2814 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2815
2816 sigemptyset(&SR_sigset);
2817 sigaddset(&SR_sigset, SR_signum);
2818
2819 // Set up signal handler for suspend/resume.
2820 act.sa_flags = SA_RESTART|SA_SIGINFO;
2821 act.sa_handler = (void (*)(int)) SR_handler;
2822
2823 // SR_signum is blocked by default.
2824 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2825
2826 if (sigaction(SR_signum, &act, 0) == -1) {
2827 return -1;
2828 }
2829
2830 // Save signal flag
2831 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2832 return 0;
2833 }
2834
2835 static int SR_finalize() {
2836 return 0;
2837 }
2838
2839 static int sr_notify(OSThread* osthread) {
2840 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2841 assert_status(status == 0, status, "pthread_kill");
2842 return status;
2843 }
2844
2845 // "Randomly" selected value for how long we want to spin
2846 // before bailing out on suspending a thread, also how often
2847 // we send a signal to a thread we want to resume
2848 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2849 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2850
2851 // returns true on success and false on error - really an error is fatal
2852 // but this seems the normal response to library errors
2853 static bool do_suspend(OSThread* osthread) {
2854 assert(osthread->sr.is_running(), "thread should be running");
2855 // mark as suspended and send signal
2856
2857 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2858 // failed to switch, state wasn't running?
2859 ShouldNotReachHere();
2860 return false;
2861 }
2862
2863 if (sr_notify(osthread) != 0) {
2864 // try to cancel, switch to running
2865
2866 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2867 if (result == os::SuspendResume::SR_RUNNING) {
2868 // cancelled
2869 return false;
2870 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2871 // somehow managed to suspend
2872 return true;
2873 } else {
2874 ShouldNotReachHere();
2875 return false;
2876 }
2877 }
2878
2879 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2880
2881 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2882 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2883 os::naked_yield();
2884 }
2885
2886 // timeout, try to cancel the request
2887 if (n >= RANDOMLY_LARGE_INTEGER) {
2888 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2889 if (cancelled == os::SuspendResume::SR_RUNNING) {
2890 return false;
2891 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2892 return true;
2893 } else {
2894 ShouldNotReachHere();
2895 return false;
2896 }
2897 }
2898 }
2899
2900 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2901 return true;
2902 }
2903
2904 static void do_resume(OSThread* osthread) {
2905 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2906
2907 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2908 // failed to switch to WAKEUP_REQUEST
2909 ShouldNotReachHere();
2910 return;
2911 }
2912
2913 while (!osthread->sr.is_running()) {
2914 if (sr_notify(osthread) == 0) {
2915 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2916 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2917 os::naked_yield();
2918 }
2919 }
2920 } else {
2921 ShouldNotReachHere();
2922 }
2923 }
2924
2925 guarantee(osthread->sr.is_running(), "Must be running!");
2926 }
2927
2928 ///////////////////////////////////////////////////////////////////////////////////
2929 // signal handling (except suspend/resume)
2930
2931 // This routine may be used by user applications as a "hook" to catch signals.
2932 // The user-defined signal handler must pass unrecognized signals to this
2933 // routine, and if it returns true (non-zero), then the signal handler must
2934 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2935 // routine will never retun false (zero), but instead will execute a VM panic
2936 // routine kill the process.
2937 //
2938 // If this routine returns false, it is OK to call it again. This allows
2939 // the user-defined signal handler to perform checks either before or after
2940 // the VM performs its own checks. Naturally, the user code would be making
2941 // a serious error if it tried to handle an exception (such as a null check
2942 // or breakpoint) that the VM was generating for its own correct operation.
2943 //
2944 // This routine may recognize any of the following kinds of signals:
2945 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2946 // It should be consulted by handlers for any of those signals.
2947 //
2948 // The caller of this routine must pass in the three arguments supplied
2949 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2950 // field of the structure passed to sigaction(). This routine assumes that
2951 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2952 //
2953 // Note that the VM will print warnings if it detects conflicting signal
2954 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2955 //
2956 extern "C" JNIEXPORT int
2957 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2958
2959 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2960 // to be the thing to call; documentation is not terribly clear about whether
2961 // pthread_sigmask also works, and if it does, whether it does the same.
2962 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2963 const int rc = ::pthread_sigmask(how, set, oset);
2964 // return value semantics differ slightly for error case:
2965 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2966 // (so, pthread_sigmask is more theadsafe for error handling)
2967 // But success is always 0.
2968 return rc == 0 ? true : false;
2969 }
2970
2971 // Function to unblock all signals which are, according
2972 // to POSIX, typical program error signals. If they happen while being blocked,
2973 // they typically will bring down the process immediately.
2974 bool unblock_program_error_signals() {
2975 sigset_t set;
2976 ::sigemptyset(&set);
2977 ::sigaddset(&set, SIGILL);
2978 ::sigaddset(&set, SIGBUS);
2979 ::sigaddset(&set, SIGFPE);
2980 ::sigaddset(&set, SIGSEGV);
2981 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2982 }
2983
2984 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2985 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2986 assert(info != NULL && uc != NULL, "it must be old kernel");
2987
2988 // Never leave program error signals blocked;
2989 // on all our platforms they would bring down the process immediately when
2990 // getting raised while being blocked.
2991 unblock_program_error_signals();
2992
2993 int orig_errno = errno; // Preserve errno value over signal handler.
2994 JVM_handle_aix_signal(sig, info, uc, true);
2995 errno = orig_errno;
2996 }
2997
2998 // This boolean allows users to forward their own non-matching signals
2999 // to JVM_handle_aix_signal, harmlessly.
3000 bool os::Aix::signal_handlers_are_installed = false;
3001
3002 // For signal-chaining
3003 bool os::Aix::libjsig_is_loaded = false;
3004 typedef struct sigaction *(*get_signal_t)(int);
3005 get_signal_t os::Aix::get_signal_action = NULL;
3006
3007 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3008 struct sigaction *actp = NULL;
3009
3010 if (libjsig_is_loaded) {
3011 // Retrieve the old signal handler from libjsig
3012 actp = (*get_signal_action)(sig);
3013 }
3014 if (actp == NULL) {
3015 // Retrieve the preinstalled signal handler from jvm
3016 actp = os::Posix::get_preinstalled_handler(sig);
3017 }
3018
3019 return actp;
3020 }
3021
3022 static bool call_chained_handler(struct sigaction *actp, int sig,
3023 siginfo_t *siginfo, void *context) {
3024 // Call the old signal handler
3025 if (actp->sa_handler == SIG_DFL) {
3026 // It's more reasonable to let jvm treat it as an unexpected exception
3027 // instead of taking the default action.
3028 return false;
3029 } else if (actp->sa_handler != SIG_IGN) {
3030 if ((actp->sa_flags & SA_NODEFER) == 0) {
3031 // automaticlly block the signal
3032 sigaddset(&(actp->sa_mask), sig);
3033 }
3034
3035 sa_handler_t hand = NULL;
3036 sa_sigaction_t sa = NULL;
3037 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3038 // retrieve the chained handler
3039 if (siginfo_flag_set) {
3040 sa = actp->sa_sigaction;
3041 } else {
3042 hand = actp->sa_handler;
3043 }
3044
3045 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3046 actp->sa_handler = SIG_DFL;
3047 }
3048
3049 // try to honor the signal mask
3050 sigset_t oset;
3051 sigemptyset(&oset);
3052 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3053
3054 // call into the chained handler
3055 if (siginfo_flag_set) {
3056 (*sa)(sig, siginfo, context);
3057 } else {
3058 (*hand)(sig);
3059 }
3060
3061 // restore the signal mask
3062 pthread_sigmask(SIG_SETMASK, &oset, NULL);
3063 }
3064 // Tell jvm's signal handler the signal is taken care of.
3065 return true;
3066 }
3067
3068 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3069 bool chained = false;
3070 // signal-chaining
3071 if (UseSignalChaining) {
3072 struct sigaction *actp = get_chained_signal_action(sig);
3073 if (actp != NULL) {
3074 chained = call_chained_handler(actp, sig, siginfo, context);
3075 }
3076 }
3077 return chained;
3078 }
3079
3080 // for diagnostic
3081 int sigflags[NSIG];
3082
3083 int os::Aix::get_our_sigflags(int sig) {
3084 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3085 return sigflags[sig];
3086 }
3087
3088 void os::Aix::set_our_sigflags(int sig, int flags) {
3089 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3090 if (sig > 0 && sig < NSIG) {
3091 sigflags[sig] = flags;
3092 }
3093 }
3094
3095 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3096 // Check for overwrite.
3097 struct sigaction oldAct;
3098 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3099
3100 void* oldhand = oldAct.sa_sigaction
3101 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3102 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3103 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3104 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3105 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3106 if (AllowUserSignalHandlers || !set_installed) {
3107 // Do not overwrite; user takes responsibility to forward to us.
3108 return;
3109 } else if (UseSignalChaining) {
3110 // save the old handler in jvm
3111 os::Posix::save_preinstalled_handler(sig, oldAct);
3112 // libjsig also interposes the sigaction() call below and saves the
3113 // old sigaction on it own.
3114 } else {
3115 fatal("Encountered unexpected pre-existing sigaction handler "
3116 "%#lx for signal %d.", (long)oldhand, sig);
3117 }
3118 }
3119
3120 struct sigaction sigAct;
3121 sigfillset(&(sigAct.sa_mask));
3122 if (!set_installed) {
3123 sigAct.sa_handler = SIG_DFL;
3124 sigAct.sa_flags = SA_RESTART;
3125 } else {
3126 sigAct.sa_sigaction = javaSignalHandler;
3127 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3128 }
3129 // Save flags, which are set by ours
3130 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3131 sigflags[sig] = sigAct.sa_flags;
3132
3133 int ret = sigaction(sig, &sigAct, &oldAct);
3134 assert(ret == 0, "check");
3135
3136 void* oldhand2 = oldAct.sa_sigaction
3137 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3138 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3139 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3140 }
3141
3142 // install signal handlers for signals that HotSpot needs to
3143 // handle in order to support Java-level exception handling.
3144 void os::Aix::install_signal_handlers() {
3145 if (!signal_handlers_are_installed) {
3146 signal_handlers_are_installed = true;
3147
3148 // signal-chaining
3149 typedef void (*signal_setting_t)();
3150 signal_setting_t begin_signal_setting = NULL;
3151 signal_setting_t end_signal_setting = NULL;
3152 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3153 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3154 if (begin_signal_setting != NULL) {
3155 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3156 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3157 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3158 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3159 libjsig_is_loaded = true;
3160 assert(UseSignalChaining, "should enable signal-chaining");
3161 }
3162 if (libjsig_is_loaded) {
3163 // Tell libjsig jvm is setting signal handlers.
3164 (*begin_signal_setting)();
3165 }
3166
3167 set_signal_handler(SIGSEGV, true);
3168 set_signal_handler(SIGPIPE, true);
3169 set_signal_handler(SIGBUS, true);
3170 set_signal_handler(SIGILL, true);
3171 set_signal_handler(SIGFPE, true);
3172 set_signal_handler(SIGTRAP, true);
3173 set_signal_handler(SIGXFSZ, true);
3174
3175 if (libjsig_is_loaded) {
3176 // Tell libjsig jvm finishes setting signal handlers.
3177 (*end_signal_setting)();
3178 }
3179
3180 // We don't activate signal checker if libjsig is in place, we trust ourselves
3181 // and if UserSignalHandler is installed all bets are off.
3182 // Log that signal checking is off only if -verbose:jni is specified.
3183 if (CheckJNICalls) {
3184 if (libjsig_is_loaded) {
3185 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3186 check_signals = false;
3187 }
3188 if (AllowUserSignalHandlers) {
3189 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3190 check_signals = false;
3191 }
3192 // Need to initialize check_signal_done.
3193 ::sigemptyset(&check_signal_done);
3194 }
3195 }
3196 }
3197
3198 static const char* get_signal_handler_name(address handler,
3199 char* buf, int buflen) {
3200 int offset;
3201 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3202 if (found) {
3203 // skip directory names
3204 const char *p1, *p2;
3205 p1 = buf;
3206 size_t len = strlen(os::file_separator());
3207 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3208 // The way os::dll_address_to_library_name is implemented on Aix
3209 // right now, it always returns -1 for the offset which is not
3210 // terribly informative.
3211 // Will fix that. For now, omit the offset.
3212 jio_snprintf(buf, buflen, "%s", p1);
3213 } else {
3214 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3215 }
3216 return buf;
3217 }
3218
3219 static void print_signal_handler(outputStream* st, int sig,
3220 char* buf, size_t buflen) {
3221 struct sigaction sa;
3222 sigaction(sig, NULL, &sa);
3223
3224 st->print("%s: ", os::exception_name(sig, buf, buflen));
3225
3226 address handler = (sa.sa_flags & SA_SIGINFO)
3227 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3228 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3229
3230 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3231 st->print("SIG_DFL");
3232 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3233 st->print("SIG_IGN");
3234 } else {
3235 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3236 }
3237
3238 // Print readable mask.
3239 st->print(", sa_mask[0]=");
3240 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3241
3242 address rh = VMError::get_resetted_sighandler(sig);
3243 // May be, handler was resetted by VMError?
3244 if (rh != NULL) {
3245 handler = rh;
3246 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3247 }
3248
3249 // Print textual representation of sa_flags.
3250 st->print(", sa_flags=");
3251 os::Posix::print_sa_flags(st, sa.sa_flags);
3252
3253 // Check: is it our handler?
3254 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3255 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3256 // It is our signal handler.
3257 // Check for flags, reset system-used one!
3258 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3259 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3260 os::Aix::get_our_sigflags(sig));
3261 }
3262 }
3263 st->cr();
3264 }
3265
3266 #define DO_SIGNAL_CHECK(sig) \
3267 if (!sigismember(&check_signal_done, sig)) \
3268 os::Aix::check_signal_handler(sig)
3269
3270 // This method is a periodic task to check for misbehaving JNI applications
3271 // under CheckJNI, we can add any periodic checks here
3272
3273 void os::run_periodic_checks() {
3274
3275 if (check_signals == false) return;
3276
3277 // SEGV and BUS if overridden could potentially prevent
3278 // generation of hs*.log in the event of a crash, debugging
3279 // such a case can be very challenging, so we absolutely
3280 // check the following for a good measure:
3281 DO_SIGNAL_CHECK(SIGSEGV);
3282 DO_SIGNAL_CHECK(SIGILL);
3283 DO_SIGNAL_CHECK(SIGFPE);
3284 DO_SIGNAL_CHECK(SIGBUS);
3285 DO_SIGNAL_CHECK(SIGPIPE);
3286 DO_SIGNAL_CHECK(SIGXFSZ);
3287 if (UseSIGTRAP) {
3288 DO_SIGNAL_CHECK(SIGTRAP);
3289 }
3290
3291 // ReduceSignalUsage allows the user to override these handlers
3292 // see comments at the very top and jvm_md.h
3293 if (!ReduceSignalUsage) {
3294 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3295 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3296 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3297 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3298 }
3299
3300 DO_SIGNAL_CHECK(SR_signum);
3301 }
3302
3303 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3304
3305 static os_sigaction_t os_sigaction = NULL;
3306
3307 void os::Aix::check_signal_handler(int sig) {
3308 char buf[O_BUFLEN];
3309 address jvmHandler = NULL;
3310
3311 struct sigaction act;
3312 if (os_sigaction == NULL) {
3313 // only trust the default sigaction, in case it has been interposed
3314 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3315 if (os_sigaction == NULL) return;
3316 }
3317
3318 os_sigaction(sig, (struct sigaction*)NULL, &act);
3319
3320 address thisHandler = (act.sa_flags & SA_SIGINFO)
3321 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3322 : CAST_FROM_FN_PTR(address, act.sa_handler);
3323
3324 switch(sig) {
3325 case SIGSEGV:
3326 case SIGBUS:
3327 case SIGFPE:
3328 case SIGPIPE:
3329 case SIGILL:
3330 case SIGXFSZ:
3331 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3332 break;
3333
3334 case SHUTDOWN1_SIGNAL:
3335 case SHUTDOWN2_SIGNAL:
3336 case SHUTDOWN3_SIGNAL:
3337 case BREAK_SIGNAL:
3338 jvmHandler = (address)user_handler();
3339 break;
3340
3341 default:
3342 if (sig == SR_signum) {
3343 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3344 } else {
3345 return;
3346 }
3347 break;
3348 }
3349
3350 if (thisHandler != jvmHandler) {
3351 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3352 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3353 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3354 // No need to check this sig any longer
3355 sigaddset(&check_signal_done, sig);
3356 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3357 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3358 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3359 exception_name(sig, buf, O_BUFLEN));
3360 }
3361 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3362 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3363 tty->print("expected:");
3364 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3365 tty->cr();
3366 tty->print(" found:");
3367 os::Posix::print_sa_flags(tty, act.sa_flags);
3368 tty->cr();
3369 // No need to check this sig any longer
3370 sigaddset(&check_signal_done, sig);
3371 }
3372
3373 // Dump all the signal
3374 if (sigismember(&check_signal_done, sig)) {
3375 print_signal_handlers(tty, buf, O_BUFLEN);
3376 }
3377 }
3378
3379 // To install functions for atexit system call
3380 extern "C" {
3381 static void perfMemory_exit_helper() {
3382 perfMemory_exit();
3383 }
3384 }
3385
3386 // This is called _before_ the most of global arguments have been parsed.
3387 void os::init(void) {
3388 // This is basic, we want to know if that ever changes.
3389 // (Shared memory boundary is supposed to be a 256M aligned.)
3390 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3391
3392 // Record process break at startup.
3393 g_brk_at_startup = (address) ::sbrk(0);
3394 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3395
3396 // First off, we need to know whether we run on AIX or PASE, and
3397 // the OS level we run on.
3398 os::Aix::initialize_os_info();
3399
3400 // Scan environment (SPEC1170 behaviour, etc).
3401 os::Aix::scan_environment();
3402
3403 // Probe multipage support.
3404 query_multipage_support();
3405
3406 // Act like we only have one page size by eliminating corner cases which
3407 // we did not support very well anyway.
3408 // We have two input conditions:
3409 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3410 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3411 // setting.
3412 // Data segment page size is important for us because it defines the thread stack page
3413 // size, which is needed for guard page handling, stack banging etc.
3414 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3415 // and should be allocated with 64k pages.
3416 //
3417 // So, we do the following:
3418 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3419 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3420 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3421 // 64k no --- AIX 5.2 ? ---
3422 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3423
3424 // We explicitly leave no option to change page size, because only upgrading would work,
3425 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3426
3427 if (g_multipage_support.datapsize == 4*K) {
3428 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3429 if (g_multipage_support.can_use_64K_pages) {
3430 // .. but we are able to use 64K pages dynamically.
3431 // This would be typical for java launchers which are not linked
3432 // with datapsize=64K (like, any other launcher but our own).
3433 //
3434 // In this case it would be smart to allocate the java heap with 64K
3435 // to get the performance benefit, and to fake 64k pages for the
3436 // data segment (when dealing with thread stacks).
3437 //
3438 // However, leave a possibility to downgrade to 4K, using
3439 // -XX:-Use64KPages.
3440 if (Use64KPages) {
3441 trcVerbose("64K page mode (faked for data segment)");
3442 Aix::_page_size = 64*K;
3443 } else {
3444 trcVerbose("4K page mode (Use64KPages=off)");
3445 Aix::_page_size = 4*K;
3446 }
3447 } else {
3448 // .. and not able to allocate 64k pages dynamically. Here, just
3449 // fall back to 4K paged mode and use mmap for everything.
3450 trcVerbose("4K page mode");
3451 Aix::_page_size = 4*K;
3452 FLAG_SET_ERGO(Use64KPages, false);
3453 }
3454 } else {
3455 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3456 // This normally means that we can allocate 64k pages dynamically.
3457 // (There is one special case where this may be false: EXTSHM=on.
3458 // but we decided to not support that mode).
3459 assert0(g_multipage_support.can_use_64K_pages);
3460 Aix::_page_size = 64*K;
3461 trcVerbose("64K page mode");
3462 FLAG_SET_ERGO(Use64KPages, true);
3463 }
3464
3465 // For now UseLargePages is just ignored.
3466 FLAG_SET_ERGO(UseLargePages, false);
3467 _page_sizes[0] = 0;
3468
3469 // debug trace
3470 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3471
3472 // Next, we need to initialize libo4 and libperfstat libraries.
3473 if (os::Aix::on_pase()) {
3474 os::Aix::initialize_libo4();
3475 } else {
3476 os::Aix::initialize_libperfstat();
3477 }
3478
3479 // Reset the perfstat information provided by ODM.
3480 if (os::Aix::on_aix()) {
3481 libperfstat::perfstat_reset();
3482 }
3483
3484 // Now initialze basic system properties. Note that for some of the values we
3485 // need libperfstat etc.
3486 os::Aix::initialize_system_info();
3487
3488 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3489
3490 init_random(1234567);
3491
3492 // _main_thread points to the thread that created/loaded the JVM.
3493 Aix::_main_thread = pthread_self();
3494
3495 initial_time_count = javaTimeNanos();
3496
3497 os::Posix::init();
3498 }
3499
3500 // This is called _after_ the global arguments have been parsed.
3501 jint os::init_2(void) {
3502
3503 // This could be set after os::Posix::init() but all platforms
3504 // have to set it the same so we have to mirror Solaris.
3505 DEBUG_ONLY(os::set_mutex_init_done();)
3506
3507 os::Posix::init_2();
3508
3509 if (os::Aix::on_pase()) {
3510 trcVerbose("Running on PASE.");
3511 } else {
3512 trcVerbose("Running on AIX (not PASE).");
3513 }
3514
3515 trcVerbose("processor count: %d", os::_processor_count);
3516 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3517
3518 // Initially build up the loaded dll map.
3519 LoadedLibraries::reload();
3520 if (Verbose) {
3521 trcVerbose("Loaded Libraries: ");
3522 LoadedLibraries::print(tty);
3523 }
3524
3525 // initialize suspend/resume support - must do this before signal_sets_init()
3526 if (SR_initialize() != 0) {
3527 perror("SR_initialize failed");
3528 return JNI_ERR;
3529 }
3530
3531 Aix::signal_sets_init();
3532 Aix::install_signal_handlers();
3533 // Initialize data for jdk.internal.misc.Signal
3534 if (!ReduceSignalUsage) {
3535 jdk_misc_signal_init();
3536 }
3537
3538 // Check and sets minimum stack sizes against command line options
3539 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3540 return JNI_ERR;
3541 }
3542
3543 // Not supported.
3544 FLAG_SET_ERGO(UseNUMA, false);
3545 FLAG_SET_ERGO(UseNUMAInterleaving, false);
3546
3547 if (MaxFDLimit) {
3548 // Set the number of file descriptors to max. print out error
3549 // if getrlimit/setrlimit fails but continue regardless.
3550 struct rlimit nbr_files;
3551 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3552 if (status != 0) {
3553 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3554 } else {
3555 nbr_files.rlim_cur = nbr_files.rlim_max;
3556 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3557 if (status != 0) {
3558 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3559 }
3560 }
3561 }
3562
3563 if (PerfAllowAtExitRegistration) {
3564 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3565 // At exit functions can be delayed until process exit time, which
3566 // can be problematic for embedded VM situations. Embedded VMs should
3567 // call DestroyJavaVM() to assure that VM resources are released.
3568
3569 // Note: perfMemory_exit_helper atexit function may be removed in
3570 // the future if the appropriate cleanup code can be added to the
3571 // VM_Exit VMOperation's doit method.
3572 if (atexit(perfMemory_exit_helper) != 0) {
3573 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3574 }
3575 }
3576
3577 // initialize thread priority policy
3578 prio_init();
3579
3580 return JNI_OK;
3581 }
3582
3583 int os::active_processor_count() {
3584 // User has overridden the number of active processors
3585 if (ActiveProcessorCount > 0) {
3586 log_trace(os)("active_processor_count: "
3587 "active processor count set by user : %d",
3588 ActiveProcessorCount);
3589 return ActiveProcessorCount;
3590 }
3591
3592 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3593 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3594 return online_cpus;
3595 }
3596
3597 void os::set_native_thread_name(const char *name) {
3598 // Not yet implemented.
3599 return;
3600 }
3601
3602 bool os::bind_to_processor(uint processor_id) {
3603 // Not yet implemented.
3604 return false;
3605 }
3606
3607 void os::SuspendedThreadTask::internal_do_task() {
3608 if (do_suspend(_thread->osthread())) {
3609 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3610 do_task(context);
3611 do_resume(_thread->osthread());
3612 }
3613 }
3614
3615 ////////////////////////////////////////////////////////////////////////////////
3616 // debug support
3617
3618 bool os::find(address addr, outputStream* st) {
3619
3620 st->print(PTR_FORMAT ": ", addr);
3621
3622 loaded_module_t lm;
3623 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3624 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3625 st->print_cr("%s", lm.path);
3626 return true;
3627 }
3628
3629 return false;
3630 }
3631
3632 ////////////////////////////////////////////////////////////////////////////////
3633 // misc
3634
3635 // This does not do anything on Aix. This is basically a hook for being
3636 // able to use structured exception handling (thread-local exception filters)
3637 // on, e.g., Win32.
3638 void
3639 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3640 JavaCallArguments* args, Thread* thread) {
3641 f(value, method, args, thread);
3642 }
3643
3644 void os::print_statistics() {
3645 }
3646
3647 bool os::message_box(const char* title, const char* message) {
3648 int i;
3649 fdStream err(defaultStream::error_fd());
3650 for (i = 0; i < 78; i++) err.print_raw("=");
3651 err.cr();
3652 err.print_raw_cr(title);
3653 for (i = 0; i < 78; i++) err.print_raw("-");
3654 err.cr();
3655 err.print_raw_cr(message);
3656 for (i = 0; i < 78; i++) err.print_raw("=");
3657 err.cr();
3658
3659 char buf[16];
3660 // Prevent process from exiting upon "read error" without consuming all CPU
3661 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3662
3663 return buf[0] == 'y' || buf[0] == 'Y';
3664 }
3665
3666 // Is a (classpath) directory empty?
3667 bool os::dir_is_empty(const char* path) {
3668 DIR *dir = NULL;
3669 struct dirent *ptr;
3670
3671 dir = opendir(path);
3672 if (dir == NULL) return true;
3673
3674 /* Scan the directory */
3675 bool result = true;
3676 while (result && (ptr = readdir(dir)) != NULL) {
3677 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3678 result = false;
3679 }
3680 }
3681 closedir(dir);
3682 return result;
3683 }
3684
3685 // This code originates from JDK's sysOpen and open64_w
3686 // from src/solaris/hpi/src/system_md.c
3687
3688 int os::open(const char *path, int oflag, int mode) {
3689
3690 if (strlen(path) > MAX_PATH - 1) {
3691 errno = ENAMETOOLONG;
3692 return -1;
3693 }
3694 // AIX 7.X now supports O_CLOEXEC too, like modern Linux; but we have to be careful, see
3695 // IV90804: OPENING A FILE IN AFS WITH O_CLOEXEC FAILS WITH AN EINVAL ERROR APPLIES TO AIX 7100-04 17/04/14 PTF PECHANGE
3696 int oflag_with_o_cloexec = oflag | O_CLOEXEC;
3697
3698 int fd = ::open64(path, oflag_with_o_cloexec, mode);
3699 if (fd == -1) {
3700 // we might fail in the open call when O_CLOEXEC is set, so try again without (see IV90804)
3701 fd = ::open64(path, oflag, mode);
3702 if (fd == -1) {
3703 return -1;
3704 }
3705 }
3706
3707 // If the open succeeded, the file might still be a directory.
3708 {
3709 struct stat64 buf64;
3710 int ret = ::fstat64(fd, &buf64);
3711 int st_mode = buf64.st_mode;
3712
3713 if (ret != -1) {
3714 if ((st_mode & S_IFMT) == S_IFDIR) {
3715 errno = EISDIR;
3716 ::close(fd);
3717 return -1;
3718 }
3719 } else {
3720 ::close(fd);
3721 return -1;
3722 }
3723 }
3724
3725 // All file descriptors that are opened in the JVM and not
3726 // specifically destined for a subprocess should have the
3727 // close-on-exec flag set. If we don't set it, then careless 3rd
3728 // party native code might fork and exec without closing all
3729 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3730 // UNIXProcess.c), and this in turn might:
3731 //
3732 // - cause end-of-file to fail to be detected on some file
3733 // descriptors, resulting in mysterious hangs, or
3734 //
3735 // - might cause an fopen in the subprocess to fail on a system
3736 // suffering from bug 1085341.
3737
3738 // Validate that the use of the O_CLOEXEC flag on open above worked.
3739 static sig_atomic_t O_CLOEXEC_is_known_to_work = 0;
3740 if (O_CLOEXEC_is_known_to_work == 0) {
3741 int flags = ::fcntl(fd, F_GETFD);
3742 if (flags != -1) {
3743 if ((flags & FD_CLOEXEC) != 0) {
3744 O_CLOEXEC_is_known_to_work = 1;
3745 } else { // it does not work
3746 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3747 O_CLOEXEC_is_known_to_work = -1;
3748 }
3749 }
3750 } else if (O_CLOEXEC_is_known_to_work == -1) {
3751 int flags = ::fcntl(fd, F_GETFD);
3752 if (flags != -1) {
3753 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3754 }
3755 }
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 }