1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2019 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "libo4.hpp"
42 #include "libperfstat_aix.hpp"
43 #include "libodm_aix.hpp"
44 #include "loadlib_aix.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/filemap.hpp"
47 #include "misc_aix.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "os_aix.inline.hpp"
50 #include "os_share_aix.hpp"
51 #include "porting_aix.hpp"
52 #include "prims/jniFastGetField.hpp"
53 #include "prims/jvm_misc.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/extendedPC.hpp"
57 #include "runtime/globals.hpp"
58 #include "runtime/interfaceSupport.inline.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/mutexLocker.hpp"
62 #include "runtime/objectMonitor.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_7
135 #define PV_7 0x200000 /* Power PC 7 */
136 #endif
137 #ifndef PV_7_Compat
138 #define PV_7_Compat 0x208000 /* Power PC 7 */
139 #endif
140 #ifndef PV_8
141 #define PV_8 0x300000 /* Power PC 8 */
142 #endif
143 #ifndef PV_8_Compat
144 #define PV_8_Compat 0x308000 /* Power PC 8 */
145 #endif
146 #ifndef PV_9
147 #define PV_9 0x400000 /* Power PC 9 */
148 #endif
149 #ifndef PV_9_Compat
150 #define PV_9_Compat 0x408000 /* Power PC 9 */
151 #endif
152
153
154 static address resolve_function_descriptor_to_code_pointer(address p);
155
156 static void vmembk_print_on(outputStream* os);
157
158 ////////////////////////////////////////////////////////////////////////////////
159 // global variables (for a description see os_aix.hpp)
160
161 julong os::Aix::_physical_memory = 0;
162
163 pthread_t os::Aix::_main_thread = ((pthread_t)0);
164 int os::Aix::_page_size = -1;
165
166 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
167 int os::Aix::_on_pase = -1;
168
169 // 0 = uninitialized, otherwise 32 bit number:
170 // 0xVVRRTTSS
171 // VV - major version
172 // RR - minor version
173 // TT - tech level, if known, 0 otherwise
174 // SS - service pack, if known, 0 otherwise
175 uint32_t os::Aix::_os_version = 0;
176
177 // -1 = uninitialized, 0 - no, 1 - yes
178 int os::Aix::_xpg_sus_mode = -1;
179
180 // -1 = uninitialized, 0 - no, 1 - yes
181 int os::Aix::_extshm = -1;
182
183 ////////////////////////////////////////////////////////////////////////////////
184 // local variables
185
186 static volatile jlong max_real_time = 0;
187 static jlong initial_time_count = 0;
188 static int clock_tics_per_sec = 100;
189 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
190 static bool check_signals = true;
191 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
192 static sigset_t SR_sigset;
193
194 // Process break recorded at startup.
195 static address g_brk_at_startup = NULL;
196
197 // This describes the state of multipage support of the underlying
198 // OS. Note that this is of no interest to the outsize world and
199 // therefore should not be defined in AIX class.
200 //
201 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
202 // latter two (16M "large" resp. 16G "huge" pages) require special
203 // setup and are normally not available.
204 //
205 // AIX supports multiple page sizes per process, for:
206 // - Stack (of the primordial thread, so not relevant for us)
207 // - Data - data, bss, heap, for us also pthread stacks
208 // - Text - text code
209 // - shared memory
210 //
211 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
212 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
213 //
214 // For shared memory, page size can be set dynamically via
215 // shmctl(). Different shared memory regions can have different page
216 // sizes.
217 //
218 // More information can be found at AIBM info center:
219 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
220 //
221 static struct {
222 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
223 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
224 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
225 size_t pthr_stack_pagesize; // stack page size of pthread threads
226 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
227 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
228 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
229 int error; // Error describing if something went wrong at multipage init.
230 } g_multipage_support = {
231 (size_t) -1,
232 (size_t) -1,
233 (size_t) -1,
234 (size_t) -1,
235 (size_t) -1,
236 false, false,
237 0
238 };
239
240 // We must not accidentally allocate memory close to the BRK - even if
241 // that would work - because then we prevent the BRK segment from
242 // growing which may result in a malloc OOM even though there is
243 // enough memory. The problem only arises if we shmat() or mmap() at
244 // a specific wish address, e.g. to place the heap in a
245 // compressed-oops-friendly way.
246 static bool is_close_to_brk(address a) {
247 assert0(g_brk_at_startup != NULL);
248 if (a >= g_brk_at_startup &&
249 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
250 return true;
251 }
252 return false;
253 }
254
255 julong os::available_memory() {
256 return Aix::available_memory();
257 }
258
259 julong os::Aix::available_memory() {
260 // Avoid expensive API call here, as returned value will always be null.
261 if (os::Aix::on_pase()) {
262 return 0x0LL;
263 }
264 os::Aix::meminfo_t mi;
265 if (os::Aix::get_meminfo(&mi)) {
266 return mi.real_free;
267 } else {
268 return ULONG_MAX;
269 }
270 }
271
272 julong os::physical_memory() {
273 return Aix::physical_memory();
274 }
275
276 // Return true if user is running as root.
277
278 bool os::have_special_privileges() {
279 static bool init = false;
280 static bool privileges = false;
281 if (!init) {
282 privileges = (getuid() != geteuid()) || (getgid() != getegid());
283 init = true;
284 }
285 return privileges;
286 }
287
288 // Helper function, emulates disclaim64 using multiple 32bit disclaims
289 // because we cannot use disclaim64() on AS/400 and old AIX releases.
290 static bool my_disclaim64(char* addr, size_t size) {
291
292 if (size == 0) {
293 return true;
294 }
295
296 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
297 const unsigned int maxDisclaimSize = 0x40000000;
298
299 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
300 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
301
302 char* p = addr;
303
304 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
305 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
306 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
307 return false;
308 }
309 p += maxDisclaimSize;
310 }
311
312 if (lastDisclaimSize > 0) {
313 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
314 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
315 return false;
316 }
317 }
318
319 return true;
320 }
321
322 // Cpu architecture string
323 #if defined(PPC32)
324 static char cpu_arch[] = "ppc";
325 #elif defined(PPC64)
326 static char cpu_arch[] = "ppc64";
327 #else
328 #error Add appropriate cpu_arch setting
329 #endif
330
331 // Wrap the function "vmgetinfo" which is not available on older OS releases.
332 static int checked_vmgetinfo(void *out, int command, int arg) {
333 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
334 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
335 }
336 return ::vmgetinfo(out, command, arg);
337 }
338
339 // Given an address, returns the size of the page backing that address.
340 size_t os::Aix::query_pagesize(void* addr) {
341
342 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
343 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
344 return 4*K;
345 }
346
347 vm_page_info pi;
348 pi.addr = (uint64_t)addr;
349 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
350 return pi.pagesize;
351 } else {
352 assert(false, "vmgetinfo failed to retrieve page size");
353 return 4*K;
354 }
355 }
356
357 void os::Aix::initialize_system_info() {
358
359 // Get the number of online(logical) cpus instead of configured.
360 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
361 assert(_processor_count > 0, "_processor_count must be > 0");
362
363 // Retrieve total physical storage.
364 os::Aix::meminfo_t mi;
365 if (!os::Aix::get_meminfo(&mi)) {
366 assert(false, "os::Aix::get_meminfo failed.");
367 }
368 _physical_memory = (julong) mi.real_total;
369 }
370
371 // Helper function for tracing page sizes.
372 static const char* describe_pagesize(size_t pagesize) {
373 switch (pagesize) {
374 case 4*K : return "4K";
375 case 64*K: return "64K";
376 case 16*M: return "16M";
377 case 16*G: return "16G";
378 default:
379 assert(false, "surprise");
380 return "??";
381 }
382 }
383
384 // Probe OS for multipage support.
385 // Will fill the global g_multipage_support structure.
386 // Must be called before calling os::large_page_init().
387 static void query_multipage_support() {
388
389 guarantee(g_multipage_support.pagesize == -1,
390 "do not call twice");
391
392 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
393
394 // This really would surprise me.
395 assert(g_multipage_support.pagesize == 4*K, "surprise!");
396
397 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
398 // Default data page size is defined either by linker options (-bdatapsize)
399 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
400 // default should be 4K.
401 {
402 void* p = ::malloc(16*M);
403 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
404 ::free(p);
405 }
406
407 // Query default shm page size (LDR_CNTRL SHMPSIZE).
408 // Note that this is pure curiosity. We do not rely on default page size but set
409 // our own page size after allocated.
410 {
411 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
412 guarantee(shmid != -1, "shmget failed");
413 void* p = ::shmat(shmid, NULL, 0);
414 ::shmctl(shmid, IPC_RMID, NULL);
415 guarantee(p != (void*) -1, "shmat failed");
416 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
417 ::shmdt(p);
418 }
419
420 // Before querying the stack page size, make sure we are not running as primordial
421 // thread (because primordial thread's stack may have different page size than
422 // pthread thread stacks). Running a VM on the primordial thread won't work for a
423 // number of reasons so we may just as well guarantee it here.
424 guarantee0(!os::is_primordial_thread());
425
426 // Query pthread stack page size. Should be the same as data page size because
427 // pthread stacks are allocated from C-Heap.
428 {
429 int dummy = 0;
430 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
431 }
432
433 // Query default text page size (LDR_CNTRL TEXTPSIZE).
434 {
435 address any_function =
436 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
437 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
438 }
439
440 // Now probe for support of 64K pages and 16M pages.
441
442 // Before OS/400 V6R1, there is no support for pages other than 4K.
443 if (os::Aix::on_pase_V5R4_or_older()) {
444 trcVerbose("OS/400 < V6R1 - no large page support.");
445 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
446 goto query_multipage_support_end;
447 }
448
449 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
450 {
451 const int MAX_PAGE_SIZES = 4;
452 psize_t sizes[MAX_PAGE_SIZES];
453 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
454 if (num_psizes == -1) {
455 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
456 trcVerbose("disabling multipage support.");
457 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
458 goto query_multipage_support_end;
459 }
460 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
461 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
462 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
463 for (int i = 0; i < num_psizes; i ++) {
464 trcVerbose(" %s ", describe_pagesize(sizes[i]));
465 }
466
467 // Can we use 64K, 16M pages?
468 for (int i = 0; i < num_psizes; i ++) {
469 const size_t pagesize = sizes[i];
470 if (pagesize != 64*K && pagesize != 16*M) {
471 continue;
472 }
473 bool can_use = false;
474 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
475 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
476 IPC_CREAT | S_IRUSR | S_IWUSR);
477 guarantee0(shmid != -1); // Should always work.
478 // Try to set pagesize.
479 struct shmid_ds shm_buf = { 0 };
480 shm_buf.shm_pagesize = pagesize;
481 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
482 const int en = errno;
483 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
484 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno);
485 } else {
486 // Attach and double check pageisze.
487 void* p = ::shmat(shmid, NULL, 0);
488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
489 guarantee0(p != (void*) -1); // Should always work.
490 const size_t real_pagesize = os::Aix::query_pagesize(p);
491 if (real_pagesize != pagesize) {
492 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize);
493 } else {
494 can_use = true;
495 }
496 ::shmdt(p);
497 }
498 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
499 if (pagesize == 64*K) {
500 g_multipage_support.can_use_64K_pages = can_use;
501 } else if (pagesize == 16*M) {
502 g_multipage_support.can_use_16M_pages = can_use;
503 }
504 }
505
506 } // end: check which pages can be used for shared memory
507
508 query_multipage_support_end:
509
510 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
511 describe_pagesize(g_multipage_support.pagesize));
512 trcVerbose("Data page size (C-Heap, bss, etc): %s",
513 describe_pagesize(g_multipage_support.datapsize));
514 trcVerbose("Text page size: %s",
515 describe_pagesize(g_multipage_support.textpsize));
516 trcVerbose("Thread stack page size (pthread): %s",
517 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
518 trcVerbose("Default shared memory page size: %s",
519 describe_pagesize(g_multipage_support.shmpsize));
520 trcVerbose("Can use 64K pages dynamically with shared memory: %s",
521 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
522 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
523 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
524 trcVerbose("Multipage error details: %d",
525 g_multipage_support.error);
526
527 // sanity checks
528 assert0(g_multipage_support.pagesize == 4*K);
529 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
530 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
531 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
532 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
533
534 }
535
536 void os::init_system_properties_values() {
537
538 #ifndef OVERRIDE_LIBPATH
539 #define DEFAULT_LIBPATH "/lib:/usr/lib"
540 #else
541 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
542 #endif
543 #define EXTENSIONS_DIR "/lib/ext"
544
545 // Buffer that fits several sprintfs.
546 // Note that the space for the trailing null is provided
547 // by the nulls included by the sizeof operator.
548 const size_t bufsize =
549 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
550 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
551 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
552
553 // sysclasspath, java_home, dll_dir
554 {
555 char *pslash;
556 os::jvm_path(buf, bufsize);
557
558 // Found the full path to libjvm.so.
559 // Now cut the path to <java_home>/jre if we can.
560 pslash = strrchr(buf, '/');
561 if (pslash != NULL) {
562 *pslash = '\0'; // Get rid of /libjvm.so.
563 }
564 pslash = strrchr(buf, '/');
565 if (pslash != NULL) {
566 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
567 }
568 Arguments::set_dll_dir(buf);
569
570 if (pslash != NULL) {
571 pslash = strrchr(buf, '/');
572 if (pslash != NULL) {
573 *pslash = '\0'; // Get rid of /lib.
574 }
575 }
576 Arguments::set_java_home(buf);
577 if (!set_boot_path('/', ':')) {
578 vm_exit_during_initialization("Failed setting boot class path.", NULL);
579 }
580 }
581
582 // Where to look for native libraries.
583
584 // On Aix we get the user setting of LIBPATH.
585 // Eventually, all the library path setting will be done here.
586 // Get the user setting of LIBPATH.
587 const char *v = ::getenv("LIBPATH");
588 const char *v_colon = ":";
589 if (v == NULL) { v = ""; v_colon = ""; }
590
591 // Concatenate user and invariant part of ld_library_path.
592 // That's +1 for the colon and +1 for the trailing '\0'.
593 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
594 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
595 Arguments::set_library_path(ld_library_path);
596 FREE_C_HEAP_ARRAY(char, ld_library_path);
597
598 // Extensions directories.
599 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
600 Arguments::set_ext_dirs(buf);
601
602 FREE_C_HEAP_ARRAY(char, buf);
603
604 #undef DEFAULT_LIBPATH
605 #undef EXTENSIONS_DIR
606 }
607
608 ////////////////////////////////////////////////////////////////////////////////
609 // breakpoint support
610
611 void os::breakpoint() {
612 BREAKPOINT;
613 }
614
615 extern "C" void breakpoint() {
616 // use debugger to set breakpoint here
617 }
618
619 ////////////////////////////////////////////////////////////////////////////////
620 // signal support
621
622 debug_only(static bool signal_sets_initialized = false);
623 static sigset_t unblocked_sigs, vm_sigs;
624
625 void os::Aix::signal_sets_init() {
626 // Should also have an assertion stating we are still single-threaded.
627 assert(!signal_sets_initialized, "Already initialized");
628 // Fill in signals that are necessarily unblocked for all threads in
629 // the VM. Currently, we unblock the following signals:
630 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
631 // by -Xrs (=ReduceSignalUsage));
632 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
633 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
634 // the dispositions or masks wrt these signals.
635 // Programs embedding the VM that want to use the above signals for their
636 // own purposes must, at this time, use the "-Xrs" option to prevent
637 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
638 // (See bug 4345157, and other related bugs).
639 // In reality, though, unblocking these signals is really a nop, since
640 // these signals are not blocked by default.
641 sigemptyset(&unblocked_sigs);
642 sigaddset(&unblocked_sigs, SIGILL);
643 sigaddset(&unblocked_sigs, SIGSEGV);
644 sigaddset(&unblocked_sigs, SIGBUS);
645 sigaddset(&unblocked_sigs, SIGFPE);
646 sigaddset(&unblocked_sigs, SIGTRAP);
647 sigaddset(&unblocked_sigs, SR_signum);
648
649 if (!ReduceSignalUsage) {
650 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
651 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
652 }
653 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
654 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
655 }
656 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
657 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
658 }
659 }
660 // Fill in signals that are blocked by all but the VM thread.
661 sigemptyset(&vm_sigs);
662 if (!ReduceSignalUsage)
663 sigaddset(&vm_sigs, BREAK_SIGNAL);
664 debug_only(signal_sets_initialized = true);
665 }
666
667 // These are signals that are unblocked while a thread is running Java.
668 // (For some reason, they get blocked by default.)
669 sigset_t* os::Aix::unblocked_signals() {
670 assert(signal_sets_initialized, "Not initialized");
671 return &unblocked_sigs;
672 }
673
674 // These are the signals that are blocked while a (non-VM) thread is
675 // running Java. Only the VM thread handles these signals.
676 sigset_t* os::Aix::vm_signals() {
677 assert(signal_sets_initialized, "Not initialized");
678 return &vm_sigs;
679 }
680
681 void os::Aix::hotspot_sigmask(Thread* thread) {
682
683 //Save caller's signal mask before setting VM signal mask
684 sigset_t caller_sigmask;
685 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
686
687 OSThread* osthread = thread->osthread();
688 osthread->set_caller_sigmask(caller_sigmask);
689
690 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
691
692 if (!ReduceSignalUsage) {
693 if (thread->is_VM_thread()) {
694 // Only the VM thread handles BREAK_SIGNAL ...
695 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
696 } else {
697 // ... all other threads block BREAK_SIGNAL
698 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
699 }
700 }
701 }
702
703 // retrieve memory information.
704 // Returns false if something went wrong;
705 // content of pmi undefined in this case.
706 bool os::Aix::get_meminfo(meminfo_t* pmi) {
707
708 assert(pmi, "get_meminfo: invalid parameter");
709
710 memset(pmi, 0, sizeof(meminfo_t));
711
712 if (os::Aix::on_pase()) {
713 // On PASE, use the libo4 porting library.
714
715 unsigned long long virt_total = 0;
716 unsigned long long real_total = 0;
717 unsigned long long real_free = 0;
718 unsigned long long pgsp_total = 0;
719 unsigned long long pgsp_free = 0;
720 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
721 pmi->virt_total = virt_total;
722 pmi->real_total = real_total;
723 pmi->real_free = real_free;
724 pmi->pgsp_total = pgsp_total;
725 pmi->pgsp_free = pgsp_free;
726 return true;
727 }
728 return false;
729
730 } else {
731
732 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
733 // See:
734 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
735 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
738
739 perfstat_memory_total_t psmt;
740 memset (&psmt, '\0', sizeof(psmt));
741 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
742 if (rc == -1) {
743 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
744 assert(0, "perfstat_memory_total() failed");
745 return false;
746 }
747
748 assert(rc == 1, "perfstat_memory_total() - weird return code");
749
750 // excerpt from
751 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
752 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
753 // The fields of perfstat_memory_total_t:
754 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
755 // u_longlong_t real_total Total real memory (in 4 KB pages).
756 // u_longlong_t real_free Free real memory (in 4 KB pages).
757 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
758 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
759
760 pmi->virt_total = psmt.virt_total * 4096;
761 pmi->real_total = psmt.real_total * 4096;
762 pmi->real_free = psmt.real_free * 4096;
763 pmi->pgsp_total = psmt.pgsp_total * 4096;
764 pmi->pgsp_free = psmt.pgsp_free * 4096;
765
766 return true;
767
768 }
769 } // end os::Aix::get_meminfo
770
771 //////////////////////////////////////////////////////////////////////////////
772 // create new thread
773
774 // Thread start routine for all newly created threads
775 static void *thread_native_entry(Thread *thread) {
776
777 thread->record_stack_base_and_size();
778
779 const pthread_t pthread_id = ::pthread_self();
780 const tid_t kernel_thread_id = ::thread_self();
781
782 LogTarget(Info, os, thread) lt;
783 if (lt.is_enabled()) {
784 address low_address = thread->stack_end();
785 address high_address = thread->stack_base();
786 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
787 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
788 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
789 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
790 }
791
792 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
793 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
794 // tools hook pthread_create(). In this case, we may run into problems establishing
795 // guard pages on those stacks, because the stacks may reside in memory which is not
796 // protectable (shmated).
797 if (thread->stack_base() > ::sbrk(0)) {
798 log_warning(os, thread)("Thread stack not in data segment.");
799 }
800
801 // Try to randomize the cache line index of hot stack frames.
802 // This helps when threads of the same stack traces evict each other's
803 // cache lines. The threads can be either from the same JVM instance, or
804 // from different JVM instances. The benefit is especially true for
805 // processors with hyperthreading technology.
806
807 static int counter = 0;
808 int pid = os::current_process_id();
809 alloca(((pid ^ counter++) & 7) * 128);
810
811 thread->initialize_thread_current();
812
813 OSThread* osthread = thread->osthread();
814
815 // Thread_id is pthread id.
816 osthread->set_thread_id(pthread_id);
817
818 // .. but keep kernel thread id too for diagnostics
819 osthread->set_kernel_thread_id(kernel_thread_id);
820
821 // Initialize signal mask for this thread.
822 os::Aix::hotspot_sigmask(thread);
823
824 // Initialize floating point control register.
825 os::Aix::init_thread_fpu_state();
826
827 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
828
829 // Call one more level start routine.
830 thread->call_run();
831
832 // Note: at this point the thread object may already have deleted itself.
833 // Prevent dereferencing it from here on out.
834 thread = NULL;
835
836 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
837 os::current_thread_id(), (uintx) kernel_thread_id);
838
839 return 0;
840 }
841
842 bool os::create_thread(Thread* thread, ThreadType thr_type,
843 size_t req_stack_size) {
844
845 assert(thread->osthread() == NULL, "caller responsible");
846
847 // Allocate the OSThread object.
848 OSThread* osthread = new OSThread(NULL, NULL);
849 if (osthread == NULL) {
850 return false;
851 }
852
853 // Set the correct thread state.
854 osthread->set_thread_type(thr_type);
855
856 // Initial state is ALLOCATED but not INITIALIZED
857 osthread->set_state(ALLOCATED);
858
859 thread->set_osthread(osthread);
860
861 // Init thread attributes.
862 pthread_attr_t attr;
863 pthread_attr_init(&attr);
864 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
865
866 // Make sure we run in 1:1 kernel-user-thread mode.
867 if (os::Aix::on_aix()) {
868 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
869 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
870 }
871
872 // Start in suspended state, and in os::thread_start, wake the thread up.
873 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
874
875 // Calculate stack size if it's not specified by caller.
876 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
877
878 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
879 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
880 // This very much looks like a pthread lib error. As a workaround, increase the stack size
881 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
882 if (stack_size < 4096 * K) {
883 stack_size += 64 * K;
884 }
885
886 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
887 // thread size in attr unchanged. If this is the minimal stack size as set
888 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
889 // guard pages might not fit on the tiny stack created.
890 int ret = pthread_attr_setstacksize(&attr, stack_size);
891 if (ret != 0) {
892 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
893 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
894 stack_size / K);
895 thread->set_osthread(NULL);
896 delete osthread;
897 return false;
898 }
899
900 // Save some cycles and a page by disabling OS guard pages where we have our own
901 // VM guard pages (in java threads). For other threads, keep system default guard
902 // pages in place.
903 if (thr_type == java_thread || thr_type == compiler_thread) {
904 ret = pthread_attr_setguardsize(&attr, 0);
905 }
906
907 pthread_t tid = 0;
908 if (ret == 0) {
909 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
910 }
911
912 if (ret == 0) {
913 char buf[64];
914 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
915 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
916 } else {
917 char buf[64];
918 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
919 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
920 // Log some OS information which might explain why creating the thread failed.
921 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
922 LogStream st(Log(os, thread)::info());
923 os::Posix::print_rlimit_info(&st);
924 os::print_memory_info(&st);
925 }
926
927 pthread_attr_destroy(&attr);
928
929 if (ret != 0) {
930 // Need to clean up stuff we've allocated so far.
931 thread->set_osthread(NULL);
932 delete osthread;
933 return false;
934 }
935
936 // OSThread::thread_id is the pthread id.
937 osthread->set_thread_id(tid);
938
939 return true;
940 }
941
942 /////////////////////////////////////////////////////////////////////////////
943 // attach existing thread
944
945 // bootstrap the main thread
946 bool os::create_main_thread(JavaThread* thread) {
947 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
948 return create_attached_thread(thread);
949 }
950
951 bool os::create_attached_thread(JavaThread* thread) {
952 #ifdef ASSERT
953 thread->verify_not_published();
954 #endif
955
956 // Allocate the OSThread object
957 OSThread* osthread = new OSThread(NULL, NULL);
958
959 if (osthread == NULL) {
960 return false;
961 }
962
963 const pthread_t pthread_id = ::pthread_self();
964 const tid_t kernel_thread_id = ::thread_self();
965
966 // OSThread::thread_id is the pthread id.
967 osthread->set_thread_id(pthread_id);
968
969 // .. but keep kernel thread id too for diagnostics
970 osthread->set_kernel_thread_id(kernel_thread_id);
971
972 // initialize floating point control register
973 os::Aix::init_thread_fpu_state();
974
975 // Initial thread state is RUNNABLE
976 osthread->set_state(RUNNABLE);
977
978 thread->set_osthread(osthread);
979
980 if (UseNUMA) {
981 int lgrp_id = os::numa_get_group_id();
982 if (lgrp_id != -1) {
983 thread->set_lgrp_id(lgrp_id);
984 }
985 }
986
987 // initialize signal mask for this thread
988 // and save the caller's signal mask
989 os::Aix::hotspot_sigmask(thread);
990
991 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
992 os::current_thread_id(), (uintx) kernel_thread_id);
993
994 return true;
995 }
996
997 void os::pd_start_thread(Thread* thread) {
998 int status = pthread_continue_np(thread->osthread()->pthread_id());
999 assert(status == 0, "thr_continue failed");
1000 }
1001
1002 // Free OS resources related to the OSThread
1003 void os::free_thread(OSThread* osthread) {
1004 assert(osthread != NULL, "osthread not set");
1005
1006 // We are told to free resources of the argument thread,
1007 // but we can only really operate on the current thread.
1008 assert(Thread::current()->osthread() == osthread,
1009 "os::free_thread but not current thread");
1010
1011 // Restore caller's signal mask
1012 sigset_t sigmask = osthread->caller_sigmask();
1013 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1014
1015 delete osthread;
1016 }
1017
1018 ////////////////////////////////////////////////////////////////////////////////
1019 // time support
1020
1021 // Time since start-up in seconds to a fine granularity.
1022 // Used by VMSelfDestructTimer and the MemProfiler.
1023 double os::elapsedTime() {
1024 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
1025 }
1026
1027 jlong os::elapsed_counter() {
1028 return javaTimeNanos() - initial_time_count;
1029 }
1030
1031 jlong os::elapsed_frequency() {
1032 return NANOSECS_PER_SEC; // nanosecond resolution
1033 }
1034
1035 bool os::supports_vtime() { return true; }
1036
1037 double os::elapsedVTime() {
1038 struct rusage usage;
1039 int retval = getrusage(RUSAGE_THREAD, &usage);
1040 if (retval == 0) {
1041 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1042 } else {
1043 // better than nothing, but not much
1044 return elapsedTime();
1045 }
1046 }
1047
1048 jlong os::javaTimeMillis() {
1049 timeval time;
1050 int status = gettimeofday(&time, NULL);
1051 assert(status != -1, "aix error at gettimeofday()");
1052 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1053 }
1054
1055 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1056 timeval time;
1057 int status = gettimeofday(&time, NULL);
1058 assert(status != -1, "aix error at gettimeofday()");
1059 seconds = jlong(time.tv_sec);
1060 nanos = jlong(time.tv_usec) * 1000;
1061 }
1062
1063 // We use mread_real_time here.
1064 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1065 // it has to be converted to real time. AIX documentations suggests to do
1066 // this unconditionally, so we do it.
1067 //
1068 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1069 //
1070 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1071 // conversion is necessary. However, mread_real_time will not return
1072 // monotonic results but merely matches read_real_time. So we need a tweak
1073 // to ensure monotonic results.
1074 //
1075 // For PASE no public documentation exists, just word by IBM
1076 jlong os::javaTimeNanos() {
1077 timebasestruct_t time;
1078 int rc = mread_real_time(&time, TIMEBASE_SZ);
1079 if (os::Aix::on_pase()) {
1080 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1081 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1082 jlong prev = max_real_time;
1083 if (now <= prev) {
1084 return prev; // same or retrograde time;
1085 }
1086 jlong obsv = Atomic::cmpxchg(&max_real_time, prev, now);
1087 assert(obsv >= prev, "invariant"); // Monotonicity
1088 // If the CAS succeeded then we're done and return "now".
1089 // If the CAS failed and the observed value "obsv" is >= now then
1090 // we should return "obsv". If the CAS failed and now > obsv > prv then
1091 // some other thread raced this thread and installed a new value, in which case
1092 // we could either (a) retry the entire operation, (b) retry trying to install now
1093 // or (c) just return obsv. We use (c). No loop is required although in some cases
1094 // we might discard a higher "now" value in deference to a slightly lower but freshly
1095 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1096 // to (a) or (b) -- and greatly reduces coherence traffic.
1097 // We might also condition (c) on the magnitude of the delta between obsv and now.
1098 // Avoiding excessive CAS operations to hot RW locations is critical.
1099 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1100 return (prev == obsv) ? now : obsv;
1101 } else {
1102 if (rc != RTC_POWER) {
1103 rc = time_base_to_time(&time, TIMEBASE_SZ);
1104 assert(rc != -1, "error calling time_base_to_time()");
1105 }
1106 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1107 }
1108 }
1109
1110 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1111 info_ptr->max_value = ALL_64_BITS;
1112 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1113 info_ptr->may_skip_backward = false;
1114 info_ptr->may_skip_forward = false;
1115 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1116 }
1117
1118 // Return the real, user, and system times in seconds from an
1119 // arbitrary fixed point in the past.
1120 bool os::getTimesSecs(double* process_real_time,
1121 double* process_user_time,
1122 double* process_system_time) {
1123 struct tms ticks;
1124 clock_t real_ticks = times(&ticks);
1125
1126 if (real_ticks == (clock_t) (-1)) {
1127 return false;
1128 } else {
1129 double ticks_per_second = (double) clock_tics_per_sec;
1130 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1131 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1132 *process_real_time = ((double) real_ticks) / ticks_per_second;
1133
1134 return true;
1135 }
1136 }
1137
1138 char * os::local_time_string(char *buf, size_t buflen) {
1139 struct tm t;
1140 time_t long_time;
1141 time(&long_time);
1142 localtime_r(&long_time, &t);
1143 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1144 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1145 t.tm_hour, t.tm_min, t.tm_sec);
1146 return buf;
1147 }
1148
1149 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1150 return localtime_r(clock, res);
1151 }
1152
1153 ////////////////////////////////////////////////////////////////////////////////
1154 // runtime exit support
1155
1156 // Note: os::shutdown() might be called very early during initialization, or
1157 // called from signal handler. Before adding something to os::shutdown(), make
1158 // sure it is async-safe and can handle partially initialized VM.
1159 void os::shutdown() {
1160
1161 // allow PerfMemory to attempt cleanup of any persistent resources
1162 perfMemory_exit();
1163
1164 // needs to remove object in file system
1165 AttachListener::abort();
1166
1167 // flush buffered output, finish log files
1168 ostream_abort();
1169
1170 // Check for abort hook
1171 abort_hook_t abort_hook = Arguments::abort_hook();
1172 if (abort_hook != NULL) {
1173 abort_hook();
1174 }
1175 }
1176
1177 // Note: os::abort() might be called very early during initialization, or
1178 // called from signal handler. Before adding something to os::abort(), make
1179 // sure it is async-safe and can handle partially initialized VM.
1180 void os::abort(bool dump_core, void* siginfo, const void* context) {
1181 os::shutdown();
1182 if (dump_core) {
1183 #ifndef PRODUCT
1184 fdStream out(defaultStream::output_fd());
1185 out.print_raw("Current thread is ");
1186 char buf[16];
1187 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1188 out.print_raw_cr(buf);
1189 out.print_raw_cr("Dumping core ...");
1190 #endif
1191 ::abort(); // dump core
1192 }
1193
1194 ::exit(1);
1195 }
1196
1197 // Die immediately, no exit hook, no abort hook, no cleanup.
1198 // Dump a core file, if possible, for debugging.
1199 void os::die() {
1200 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1201 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1202 // and don't take the time to generate a core file.
1203 os::signal_raise(SIGKILL);
1204 } else {
1205 ::abort();
1206 }
1207 }
1208
1209 intx os::current_thread_id() {
1210 return (intx)pthread_self();
1211 }
1212
1213 int os::current_process_id() {
1214 return getpid();
1215 }
1216
1217 // DLL functions
1218
1219 const char* os::dll_file_extension() { return ".so"; }
1220
1221 // This must be hard coded because it's the system's temporary
1222 // directory not the java application's temp directory, ala java.io.tmpdir.
1223 const char* os::get_temp_directory() { return "/tmp"; }
1224
1225 // Check if addr is inside libjvm.so.
1226 bool os::address_is_in_vm(address addr) {
1227
1228 // Input could be a real pc or a function pointer literal. The latter
1229 // would be a function descriptor residing in the data segment of a module.
1230 loaded_module_t lm;
1231 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1232 return lm.is_in_vm;
1233 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1234 return lm.is_in_vm;
1235 } else {
1236 return false;
1237 }
1238
1239 }
1240
1241 // Resolve an AIX function descriptor literal to a code pointer.
1242 // If the input is a valid code pointer to a text segment of a loaded module,
1243 // it is returned unchanged.
1244 // If the input is a valid AIX function descriptor, it is resolved to the
1245 // code entry point.
1246 // If the input is neither a valid function descriptor nor a valid code pointer,
1247 // NULL is returned.
1248 static address resolve_function_descriptor_to_code_pointer(address p) {
1249
1250 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1251 // It is a real code pointer.
1252 return p;
1253 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1254 // Pointer to data segment, potential function descriptor.
1255 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1256 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1257 // It is a function descriptor.
1258 return code_entry;
1259 }
1260 }
1261
1262 return NULL;
1263 }
1264
1265 bool os::dll_address_to_function_name(address addr, char *buf,
1266 int buflen, int *offset,
1267 bool demangle) {
1268 if (offset) {
1269 *offset = -1;
1270 }
1271 // Buf is not optional, but offset is optional.
1272 assert(buf != NULL, "sanity check");
1273 buf[0] = '\0';
1274
1275 // Resolve function ptr literals first.
1276 addr = resolve_function_descriptor_to_code_pointer(addr);
1277 if (!addr) {
1278 return false;
1279 }
1280
1281 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1282 }
1283
1284 bool os::dll_address_to_library_name(address addr, char* buf,
1285 int buflen, int* offset) {
1286 if (offset) {
1287 *offset = -1;
1288 }
1289 // Buf is not optional, but offset is optional.
1290 assert(buf != NULL, "sanity check");
1291 buf[0] = '\0';
1292
1293 // Resolve function ptr literals first.
1294 addr = resolve_function_descriptor_to_code_pointer(addr);
1295 if (!addr) {
1296 return false;
1297 }
1298
1299 return AixSymbols::get_module_name(addr, buf, buflen);
1300 }
1301
1302 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1303 // for the same architecture as Hotspot is running on.
1304 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1305
1306 log_info(os)("attempting shared library load of %s", filename);
1307
1308 if (ebuf && ebuflen > 0) {
1309 ebuf[0] = '\0';
1310 ebuf[ebuflen - 1] = '\0';
1311 }
1312
1313 if (!filename || strlen(filename) == 0) {
1314 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1315 return NULL;
1316 }
1317
1318 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1319 void * result= ::dlopen(filename, RTLD_LAZY);
1320 if (result != NULL) {
1321 Events::log(NULL, "Loaded shared library %s", filename);
1322 // Reload dll cache. Don't do this in signal handling.
1323 LoadedLibraries::reload();
1324 log_info(os)("shared library load of %s was successful", filename);
1325 return result;
1326 } else {
1327 // error analysis when dlopen fails
1328 const char* error_report = ::dlerror();
1329 if (error_report == NULL) {
1330 error_report = "dlerror returned no error description";
1331 }
1332 if (ebuf != NULL && ebuflen > 0) {
1333 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1334 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1335 }
1336 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1337 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1338 }
1339 return NULL;
1340 }
1341
1342 void* os::dll_lookup(void* handle, const char* name) {
1343 void* res = dlsym(handle, name);
1344 return res;
1345 }
1346
1347 void* os::get_default_process_handle() {
1348 return (void*)::dlopen(NULL, RTLD_LAZY);
1349 }
1350
1351 void os::print_dll_info(outputStream *st) {
1352 st->print_cr("Dynamic libraries:");
1353 LoadedLibraries::print(st);
1354 }
1355
1356 void os::get_summary_os_info(char* buf, size_t buflen) {
1357 // There might be something more readable than uname results for AIX.
1358 struct utsname name;
1359 uname(&name);
1360 snprintf(buf, buflen, "%s %s", name.release, name.version);
1361 }
1362
1363 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1364 // Not yet implemented.
1365 return 0;
1366 }
1367
1368 void os::print_os_info_brief(outputStream* st) {
1369 uint32_t ver = os::Aix::os_version();
1370 st->print_cr("AIX kernel version %u.%u.%u.%u",
1371 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1372
1373 os::Posix::print_uname_info(st);
1374
1375 // Linux uses print_libversion_info(st); here.
1376 }
1377
1378 void os::print_os_info(outputStream* st) {
1379 st->print("OS:");
1380
1381 os::Posix::print_uname_info(st);
1382
1383 uint32_t ver = os::Aix::os_version();
1384 st->print_cr("AIX kernel version %u.%u.%u.%u",
1385 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1386
1387 os::Posix::print_rlimit_info(st);
1388
1389 os::Posix::print_load_average(st);
1390
1391 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process.
1392 long tmax = sysconf(_SC_THREAD_THREADS_MAX);
1393 st->print_cr("maximum #threads within a process:%ld", tmax);
1394
1395 // print wpar info
1396 libperfstat::wparinfo_t wi;
1397 if (libperfstat::get_wparinfo(&wi)) {
1398 st->print_cr("wpar info");
1399 st->print_cr("name: %s", wi.name);
1400 st->print_cr("id: %d", wi.wpar_id);
1401 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1402 }
1403
1404 VM_Version::print_platform_virtualization_info(st);
1405 }
1406
1407 void os::print_memory_info(outputStream* st) {
1408
1409 st->print_cr("Memory:");
1410
1411 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1412 describe_pagesize(g_multipage_support.pagesize));
1413 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1414 describe_pagesize(g_multipage_support.datapsize));
1415 st->print_cr(" Text page size: %s",
1416 describe_pagesize(g_multipage_support.textpsize));
1417 st->print_cr(" Thread stack page size (pthread): %s",
1418 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1419 st->print_cr(" Default shared memory page size: %s",
1420 describe_pagesize(g_multipage_support.shmpsize));
1421 st->print_cr(" Can use 64K pages dynamically with shared memory: %s",
1422 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1423 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1424 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1425 st->print_cr(" Multipage error: %d",
1426 g_multipage_support.error);
1427 st->cr();
1428 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1429
1430 // print out LDR_CNTRL because it affects the default page sizes
1431 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1432 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1433
1434 // Print out EXTSHM because it is an unsupported setting.
1435 const char* const extshm = ::getenv("EXTSHM");
1436 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1437 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1438 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1439 }
1440
1441 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1442 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1443 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1444 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1445 st->cr();
1446
1447 os::Aix::meminfo_t mi;
1448 if (os::Aix::get_meminfo(&mi)) {
1449 if (os::Aix::on_aix()) {
1450 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1451 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1452 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1453 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1454 } else {
1455 // PASE - Numbers are result of QWCRSSTS; they mean:
1456 // real_total: Sum of all system pools
1457 // real_free: always 0
1458 // pgsp_total: we take the size of the system ASP
1459 // pgsp_free: size of system ASP times percentage of system ASP unused
1460 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1461 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1462 st->print_cr("%% system asp used : %.2f",
1463 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1464 }
1465 }
1466 st->cr();
1467
1468 // Print program break.
1469 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1470 address brk_now = (address)::sbrk(0);
1471 if (brk_now != (address)-1) {
1472 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1473 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1474 }
1475 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1476 st->cr();
1477
1478 // Print segments allocated with os::reserve_memory.
1479 st->print_cr("internal virtual memory regions used by vm:");
1480 vmembk_print_on(st);
1481 }
1482
1483 // Get a string for the cpuinfo that is a summary of the cpu type
1484 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1485 // read _system_configuration.version
1486 switch (_system_configuration.version) {
1487 case PV_9:
1488 strncpy(buf, "Power PC 9", buflen);
1489 break;
1490 case PV_8:
1491 strncpy(buf, "Power PC 8", buflen);
1492 break;
1493 case PV_7:
1494 strncpy(buf, "Power PC 7", buflen);
1495 break;
1496 case PV_6_1:
1497 strncpy(buf, "Power PC 6 DD1.x", buflen);
1498 break;
1499 case PV_6:
1500 strncpy(buf, "Power PC 6", buflen);
1501 break;
1502 case PV_5:
1503 strncpy(buf, "Power PC 5", buflen);
1504 break;
1505 case PV_5_2:
1506 strncpy(buf, "Power PC 5_2", buflen);
1507 break;
1508 case PV_5_3:
1509 strncpy(buf, "Power PC 5_3", buflen);
1510 break;
1511 case PV_5_Compat:
1512 strncpy(buf, "PV_5_Compat", buflen);
1513 break;
1514 case PV_6_Compat:
1515 strncpy(buf, "PV_6_Compat", buflen);
1516 break;
1517 case PV_7_Compat:
1518 strncpy(buf, "PV_7_Compat", buflen);
1519 break;
1520 case PV_8_Compat:
1521 strncpy(buf, "PV_8_Compat", buflen);
1522 break;
1523 case PV_9_Compat:
1524 strncpy(buf, "PV_9_Compat", buflen);
1525 break;
1526 default:
1527 strncpy(buf, "unknown", buflen);
1528 }
1529 }
1530
1531 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1532 // Nothing to do beyond of what os::print_cpu_info() does.
1533 }
1534
1535 static void print_signal_handler(outputStream* st, int sig,
1536 char* buf, size_t buflen);
1537
1538 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1539 st->print_cr("Signal Handlers:");
1540 print_signal_handler(st, SIGSEGV, buf, buflen);
1541 print_signal_handler(st, SIGBUS , buf, buflen);
1542 print_signal_handler(st, SIGFPE , buf, buflen);
1543 print_signal_handler(st, SIGPIPE, buf, buflen);
1544 print_signal_handler(st, SIGXFSZ, buf, buflen);
1545 print_signal_handler(st, SIGILL , buf, buflen);
1546 print_signal_handler(st, SR_signum, buf, buflen);
1547 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1548 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1549 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1550 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1551 print_signal_handler(st, SIGTRAP, buf, buflen);
1552 // We also want to know if someone else adds a SIGDANGER handler because
1553 // that will interfere with OOM killling.
1554 print_signal_handler(st, SIGDANGER, buf, buflen);
1555 }
1556
1557 static char saved_jvm_path[MAXPATHLEN] = {0};
1558
1559 // Find the full path to the current module, libjvm.so.
1560 void os::jvm_path(char *buf, jint buflen) {
1561 // Error checking.
1562 if (buflen < MAXPATHLEN) {
1563 assert(false, "must use a large-enough buffer");
1564 buf[0] = '\0';
1565 return;
1566 }
1567 // Lazy resolve the path to current module.
1568 if (saved_jvm_path[0] != 0) {
1569 strcpy(buf, saved_jvm_path);
1570 return;
1571 }
1572
1573 Dl_info dlinfo;
1574 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1575 assert(ret != 0, "cannot locate libjvm");
1576 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1577 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1578
1579 if (Arguments::sun_java_launcher_is_altjvm()) {
1580 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1581 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1582 // If "/jre/lib/" appears at the right place in the string, then
1583 // assume we are installed in a JDK and we're done. Otherwise, check
1584 // for a JAVA_HOME environment variable and fix up the path so it
1585 // looks like libjvm.so is installed there (append a fake suffix
1586 // hotspot/libjvm.so).
1587 const char *p = buf + strlen(buf) - 1;
1588 for (int count = 0; p > buf && count < 4; ++count) {
1589 for (--p; p > buf && *p != '/'; --p)
1590 /* empty */ ;
1591 }
1592
1593 if (strncmp(p, "/jre/lib/", 9) != 0) {
1594 // Look for JAVA_HOME in the environment.
1595 char* java_home_var = ::getenv("JAVA_HOME");
1596 if (java_home_var != NULL && java_home_var[0] != 0) {
1597 char* jrelib_p;
1598 int len;
1599
1600 // Check the current module name "libjvm.so".
1601 p = strrchr(buf, '/');
1602 if (p == NULL) {
1603 return;
1604 }
1605 assert(strstr(p, "/libjvm") == p, "invalid library name");
1606
1607 rp = os::Posix::realpath(java_home_var, buf, buflen);
1608 if (rp == NULL) {
1609 return;
1610 }
1611
1612 // determine if this is a legacy image or modules image
1613 // modules image doesn't have "jre" subdirectory
1614 len = strlen(buf);
1615 assert(len < buflen, "Ran out of buffer room");
1616 jrelib_p = buf + len;
1617 snprintf(jrelib_p, buflen-len, "/jre/lib");
1618 if (0 != access(buf, F_OK)) {
1619 snprintf(jrelib_p, buflen-len, "/lib");
1620 }
1621
1622 if (0 == access(buf, F_OK)) {
1623 // Use current module name "libjvm.so"
1624 len = strlen(buf);
1625 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1626 } else {
1627 // Go back to path of .so
1628 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1629 if (rp == NULL) {
1630 return;
1631 }
1632 }
1633 }
1634 }
1635 }
1636
1637 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1638 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1639 }
1640
1641 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1642 // no prefix required, not even "_"
1643 }
1644
1645 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1646 // no suffix required
1647 }
1648
1649 ////////////////////////////////////////////////////////////////////////////////
1650 // sun.misc.Signal support
1651
1652 static void
1653 UserHandler(int sig, void *siginfo, void *context) {
1654 // Ctrl-C is pressed during error reporting, likely because the error
1655 // handler fails to abort. Let VM die immediately.
1656 if (sig == SIGINT && VMError::is_error_reported()) {
1657 os::die();
1658 }
1659
1660 os::signal_notify(sig);
1661 }
1662
1663 void* os::user_handler() {
1664 return CAST_FROM_FN_PTR(void*, UserHandler);
1665 }
1666
1667 extern "C" {
1668 typedef void (*sa_handler_t)(int);
1669 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1670 }
1671
1672 void* os::signal(int signal_number, void* handler) {
1673 struct sigaction sigAct, oldSigAct;
1674
1675 sigfillset(&(sigAct.sa_mask));
1676
1677 // Do not block out synchronous signals in the signal handler.
1678 // Blocking synchronous signals only makes sense if you can really
1679 // be sure that those signals won't happen during signal handling,
1680 // when the blocking applies. Normal signal handlers are lean and
1681 // do not cause signals. But our signal handlers tend to be "risky"
1682 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1683 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1684 // by a SIGILL, which was blocked due to the signal mask. The process
1685 // just hung forever. Better to crash from a secondary signal than to hang.
1686 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1687 sigdelset(&(sigAct.sa_mask), SIGBUS);
1688 sigdelset(&(sigAct.sa_mask), SIGILL);
1689 sigdelset(&(sigAct.sa_mask), SIGFPE);
1690 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1691
1692 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1693
1694 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1695
1696 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1697 // -1 means registration failed
1698 return (void *)-1;
1699 }
1700
1701 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1702 }
1703
1704 void os::signal_raise(int signal_number) {
1705 ::raise(signal_number);
1706 }
1707
1708 //
1709 // The following code is moved from os.cpp for making this
1710 // code platform specific, which it is by its very nature.
1711 //
1712
1713 // Will be modified when max signal is changed to be dynamic
1714 int os::sigexitnum_pd() {
1715 return NSIG;
1716 }
1717
1718 // a counter for each possible signal value
1719 static volatile jint pending_signals[NSIG+1] = { 0 };
1720
1721 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1722 // On AIX, we use sem_init(), sem_post(), sem_wait()
1723 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1724 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1725 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1726 // on AIX, msem_..() calls are suspected of causing problems.
1727 static sem_t sig_sem;
1728 static msemaphore* p_sig_msem = 0;
1729
1730 static void local_sem_init() {
1731 if (os::Aix::on_aix()) {
1732 int rc = ::sem_init(&sig_sem, 0, 0);
1733 guarantee(rc != -1, "sem_init failed");
1734 } else {
1735 // Memory semaphores must live in shared mem.
1736 guarantee0(p_sig_msem == NULL);
1737 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1738 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1739 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1740 }
1741 }
1742
1743 static void local_sem_post() {
1744 static bool warn_only_once = false;
1745 if (os::Aix::on_aix()) {
1746 int rc = ::sem_post(&sig_sem);
1747 if (rc == -1 && !warn_only_once) {
1748 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1749 warn_only_once = true;
1750 }
1751 } else {
1752 guarantee0(p_sig_msem != NULL);
1753 int rc = ::msem_unlock(p_sig_msem, 0);
1754 if (rc == -1 && !warn_only_once) {
1755 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1756 warn_only_once = true;
1757 }
1758 }
1759 }
1760
1761 static void local_sem_wait() {
1762 static bool warn_only_once = false;
1763 if (os::Aix::on_aix()) {
1764 int rc = ::sem_wait(&sig_sem);
1765 if (rc == -1 && !warn_only_once) {
1766 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1767 warn_only_once = true;
1768 }
1769 } else {
1770 guarantee0(p_sig_msem != NULL); // must init before use
1771 int rc = ::msem_lock(p_sig_msem, 0);
1772 if (rc == -1 && !warn_only_once) {
1773 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1774 warn_only_once = true;
1775 }
1776 }
1777 }
1778
1779 static void jdk_misc_signal_init() {
1780 // Initialize signal structures
1781 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1782
1783 // Initialize signal semaphore
1784 local_sem_init();
1785 }
1786
1787 void os::signal_notify(int sig) {
1788 Atomic::inc(&pending_signals[sig]);
1789 local_sem_post();
1790 }
1791
1792 static int check_pending_signals() {
1793 for (;;) {
1794 for (int i = 0; i < NSIG + 1; i++) {
1795 jint n = pending_signals[i];
1796 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1797 return i;
1798 }
1799 }
1800 JavaThread *thread = JavaThread::current();
1801 ThreadBlockInVM tbivm(thread);
1802
1803 bool threadIsSuspended;
1804 do {
1805 thread->set_suspend_equivalent();
1806 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1807
1808 local_sem_wait();
1809
1810 // were we externally suspended while we were waiting?
1811 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1812 if (threadIsSuspended) {
1813 //
1814 // The semaphore has been incremented, but while we were waiting
1815 // another thread suspended us. We don't want to continue running
1816 // while suspended because that would surprise the thread that
1817 // suspended us.
1818 //
1819
1820 local_sem_post();
1821
1822 thread->java_suspend_self();
1823 }
1824 } while (threadIsSuspended);
1825 }
1826 }
1827
1828 int os::signal_wait() {
1829 return check_pending_signals();
1830 }
1831
1832 ////////////////////////////////////////////////////////////////////////////////
1833 // Virtual Memory
1834
1835 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1836
1837 #define VMEM_MAPPED 1
1838 #define VMEM_SHMATED 2
1839
1840 struct vmembk_t {
1841 int type; // 1 - mmap, 2 - shmat
1842 char* addr;
1843 size_t size; // Real size, may be larger than usersize.
1844 size_t pagesize; // page size of area
1845 vmembk_t* next;
1846
1847 bool contains_addr(char* p) const {
1848 return p >= addr && p < (addr + size);
1849 }
1850
1851 bool contains_range(char* p, size_t s) const {
1852 return contains_addr(p) && contains_addr(p + s - 1);
1853 }
1854
1855 void print_on(outputStream* os) const {
1856 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1857 " bytes, %d %s pages), %s",
1858 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1859 (type == VMEM_SHMATED ? "shmat" : "mmap")
1860 );
1861 }
1862
1863 // Check that range is a sub range of memory block (or equal to memory block);
1864 // also check that range is fully page aligned to the page size if the block.
1865 void assert_is_valid_subrange(char* p, size_t s) const {
1866 if (!contains_range(p, s)) {
1867 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1868 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1869 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size));
1870 guarantee0(false);
1871 }
1872 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1873 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1874 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize);
1875 guarantee0(false);
1876 }
1877 }
1878 };
1879
1880 static struct {
1881 vmembk_t* first;
1882 MiscUtils::CritSect cs;
1883 } vmem;
1884
1885 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1886 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1887 assert0(p);
1888 if (p) {
1889 MiscUtils::AutoCritSect lck(&vmem.cs);
1890 p->addr = addr; p->size = size;
1891 p->pagesize = pagesize;
1892 p->type = type;
1893 p->next = vmem.first;
1894 vmem.first = p;
1895 }
1896 }
1897
1898 static vmembk_t* vmembk_find(char* addr) {
1899 MiscUtils::AutoCritSect lck(&vmem.cs);
1900 for (vmembk_t* p = vmem.first; p; p = p->next) {
1901 if (p->addr <= addr && (p->addr + p->size) > addr) {
1902 return p;
1903 }
1904 }
1905 return NULL;
1906 }
1907
1908 static void vmembk_remove(vmembk_t* p0) {
1909 MiscUtils::AutoCritSect lck(&vmem.cs);
1910 assert0(p0);
1911 assert0(vmem.first); // List should not be empty.
1912 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1913 if (*pp == p0) {
1914 *pp = p0->next;
1915 ::free(p0);
1916 return;
1917 }
1918 }
1919 assert0(false); // Not found?
1920 }
1921
1922 static void vmembk_print_on(outputStream* os) {
1923 MiscUtils::AutoCritSect lck(&vmem.cs);
1924 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1925 vmi->print_on(os);
1926 os->cr();
1927 }
1928 }
1929
1930 // Reserve and attach a section of System V memory.
1931 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1932 // address. Failing that, it will attach the memory anywhere.
1933 // If <requested_addr> is NULL, function will attach the memory anywhere.
1934 //
1935 // <alignment_hint> is being ignored by this function. It is very probable however that the
1936 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1937 // Should this be not enogh, we can put more work into it.
1938 static char* reserve_shmated_memory (
1939 size_t bytes,
1940 char* requested_addr,
1941 size_t alignment_hint) {
1942
1943 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1944 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1945 bytes, p2i(requested_addr), alignment_hint);
1946
1947 // Either give me wish address or wish alignment but not both.
1948 assert0(!(requested_addr != NULL && alignment_hint != 0));
1949
1950 // We must prevent anyone from attaching too close to the
1951 // BRK because that may cause malloc OOM.
1952 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1953 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1954 "Will attach anywhere.", p2i(requested_addr));
1955 // Act like the OS refused to attach there.
1956 requested_addr = NULL;
1957 }
1958
1959 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1960 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1961 if (os::Aix::on_pase_V5R4_or_older()) {
1962 ShouldNotReachHere();
1963 }
1964
1965 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1966 const size_t size = align_up(bytes, 64*K);
1967
1968 // Reserve the shared segment.
1969 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1970 if (shmid == -1) {
1971 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1972 return NULL;
1973 }
1974
1975 // Important note:
1976 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1977 // We must right after attaching it remove it from the system. System V shm segments are global and
1978 // survive the process.
1979 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1980
1981 struct shmid_ds shmbuf;
1982 memset(&shmbuf, 0, sizeof(shmbuf));
1983 shmbuf.shm_pagesize = 64*K;
1984 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1985 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1986 size / (64*K), errno);
1987 // I want to know if this ever happens.
1988 assert(false, "failed to set page size for shmat");
1989 }
1990
1991 // Now attach the shared segment.
1992 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1993 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1994 // were not a segment boundary.
1995 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1996 const int errno_shmat = errno;
1997
1998 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1999 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2000 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2001 assert(false, "failed to remove shared memory segment!");
2002 }
2003
2004 // Handle shmat error. If we failed to attach, just return.
2005 if (addr == (char*)-1) {
2006 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat);
2007 return NULL;
2008 }
2009
2010 // Just for info: query the real page size. In case setting the page size did not
2011 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2012 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2013 if (real_pagesize != shmbuf.shm_pagesize) {
2014 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize);
2015 }
2016
2017 if (addr) {
2018 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2019 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize));
2020 } else {
2021 if (requested_addr != NULL) {
2022 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr));
2023 } else {
2024 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2025 }
2026 }
2027
2028 // book-keeping
2029 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2030 assert0(is_aligned_to(addr, os::vm_page_size()));
2031
2032 return addr;
2033 }
2034
2035 static bool release_shmated_memory(char* addr, size_t size) {
2036
2037 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2038 p2i(addr), p2i(addr + size - 1));
2039
2040 bool rc = false;
2041
2042 // TODO: is there a way to verify shm size without doing bookkeeping?
2043 if (::shmdt(addr) != 0) {
2044 trcVerbose("error (%d).", errno);
2045 } else {
2046 trcVerbose("ok.");
2047 rc = true;
2048 }
2049 return rc;
2050 }
2051
2052 static bool uncommit_shmated_memory(char* addr, size_t size) {
2053 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2054 p2i(addr), p2i(addr + size - 1));
2055
2056 const bool rc = my_disclaim64(addr, size);
2057
2058 if (!rc) {
2059 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size);
2060 return false;
2061 }
2062 return true;
2063 }
2064
2065 //////////////////////////////// mmap-based routines /////////////////////////////////
2066
2067 // Reserve memory via mmap.
2068 // If <requested_addr> is given, an attempt is made to attach at the given address.
2069 // Failing that, memory is allocated at any address.
2070 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2071 // allocate at an address aligned with the given alignment. Failing that, memory
2072 // is aligned anywhere.
2073 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2074 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2075 "alignment_hint " UINTX_FORMAT "...",
2076 bytes, p2i(requested_addr), alignment_hint);
2077
2078 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2079 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2080 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr));
2081 return NULL;
2082 }
2083
2084 // We must prevent anyone from attaching too close to the
2085 // BRK because that may cause malloc OOM.
2086 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2087 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2088 "Will attach anywhere.", p2i(requested_addr));
2089 // Act like the OS refused to attach there.
2090 requested_addr = NULL;
2091 }
2092
2093 // Specify one or the other but not both.
2094 assert0(!(requested_addr != NULL && alignment_hint > 0));
2095
2096 // In 64K mode, we claim the global page size (os::vm_page_size())
2097 // is 64K. This is one of the few points where that illusion may
2098 // break, because mmap() will always return memory aligned to 4K. So
2099 // we must ensure we only ever return memory aligned to 64k.
2100 if (alignment_hint) {
2101 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2102 } else {
2103 alignment_hint = os::vm_page_size();
2104 }
2105
2106 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2107 const size_t size = align_up(bytes, os::vm_page_size());
2108
2109 // alignment: Allocate memory large enough to include an aligned range of the right size and
2110 // cut off the leading and trailing waste pages.
2111 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2112 const size_t extra_size = size + alignment_hint;
2113
2114 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2115 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2116 int flags = MAP_ANONYMOUS | MAP_SHARED;
2117
2118 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2119 // it means if wishaddress is given but MAP_FIXED is not set.
2120 //
2121 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2122 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2123 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2124 // get clobbered.
2125 if (requested_addr != NULL) {
2126 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2127 flags |= MAP_FIXED;
2128 }
2129 }
2130
2131 char* addr = (char*)::mmap(requested_addr, extra_size,
2132 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2133
2134 if (addr == MAP_FAILED) {
2135 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno);
2136 return NULL;
2137 }
2138
2139 // Handle alignment.
2140 char* const addr_aligned = align_up(addr, alignment_hint);
2141 const size_t waste_pre = addr_aligned - addr;
2142 char* const addr_aligned_end = addr_aligned + size;
2143 const size_t waste_post = extra_size - waste_pre - size;
2144 if (waste_pre > 0) {
2145 ::munmap(addr, waste_pre);
2146 }
2147 if (waste_post > 0) {
2148 ::munmap(addr_aligned_end, waste_post);
2149 }
2150 addr = addr_aligned;
2151
2152 if (addr) {
2153 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2154 p2i(addr), p2i(addr + bytes), bytes);
2155 } else {
2156 if (requested_addr != NULL) {
2157 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr));
2158 } else {
2159 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2160 }
2161 }
2162
2163 // bookkeeping
2164 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2165
2166 // Test alignment, see above.
2167 assert0(is_aligned_to(addr, os::vm_page_size()));
2168
2169 return addr;
2170 }
2171
2172 static bool release_mmaped_memory(char* addr, size_t size) {
2173 assert0(is_aligned_to(addr, os::vm_page_size()));
2174 assert0(is_aligned_to(size, os::vm_page_size()));
2175
2176 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2177 p2i(addr), p2i(addr + size - 1));
2178 bool rc = false;
2179
2180 if (::munmap(addr, size) != 0) {
2181 trcVerbose("failed (%d)\n", errno);
2182 rc = false;
2183 } else {
2184 trcVerbose("ok.");
2185 rc = true;
2186 }
2187
2188 return rc;
2189 }
2190
2191 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2192
2193 assert0(is_aligned_to(addr, os::vm_page_size()));
2194 assert0(is_aligned_to(size, os::vm_page_size()));
2195
2196 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2197 p2i(addr), p2i(addr + size - 1));
2198 bool rc = false;
2199
2200 // Uncommit mmap memory with msync MS_INVALIDATE.
2201 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2202 trcVerbose("failed (%d)\n", errno);
2203 rc = false;
2204 } else {
2205 trcVerbose("ok.");
2206 rc = true;
2207 }
2208
2209 return rc;
2210 }
2211
2212 int os::vm_page_size() {
2213 // Seems redundant as all get out.
2214 assert(os::Aix::page_size() != -1, "must call os::init");
2215 return os::Aix::page_size();
2216 }
2217
2218 // Aix allocates memory by pages.
2219 int os::vm_allocation_granularity() {
2220 assert(os::Aix::page_size() != -1, "must call os::init");
2221 return os::Aix::page_size();
2222 }
2223
2224 #ifdef PRODUCT
2225 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2226 int err) {
2227 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2228 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec,
2229 os::errno_name(err), err);
2230 }
2231 #endif
2232
2233 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2234 const char* mesg) {
2235 assert(mesg != NULL, "mesg must be specified");
2236 if (!pd_commit_memory(addr, size, exec)) {
2237 // Add extra info in product mode for vm_exit_out_of_memory():
2238 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2239 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2240 }
2241 }
2242
2243 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2244
2245 assert(is_aligned_to(addr, os::vm_page_size()),
2246 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2247 p2i(addr), os::vm_page_size());
2248 assert(is_aligned_to(size, os::vm_page_size()),
2249 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2250 size, os::vm_page_size());
2251
2252 vmembk_t* const vmi = vmembk_find(addr);
2253 guarantee0(vmi);
2254 vmi->assert_is_valid_subrange(addr, size);
2255
2256 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1));
2257
2258 if (UseExplicitCommit) {
2259 // AIX commits memory on touch. So, touch all pages to be committed.
2260 for (char* p = addr; p < (addr + size); p += 4*K) {
2261 *p = '\0';
2262 }
2263 }
2264
2265 return true;
2266 }
2267
2268 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2269 return pd_commit_memory(addr, size, exec);
2270 }
2271
2272 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2273 size_t alignment_hint, bool exec,
2274 const char* mesg) {
2275 // Alignment_hint is ignored on this OS.
2276 pd_commit_memory_or_exit(addr, size, exec, mesg);
2277 }
2278
2279 bool os::pd_uncommit_memory(char* addr, size_t size) {
2280 assert(is_aligned_to(addr, os::vm_page_size()),
2281 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2282 p2i(addr), os::vm_page_size());
2283 assert(is_aligned_to(size, os::vm_page_size()),
2284 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2285 size, os::vm_page_size());
2286
2287 // Dynamically do different things for mmap/shmat.
2288 const vmembk_t* const vmi = vmembk_find(addr);
2289 guarantee0(vmi);
2290 vmi->assert_is_valid_subrange(addr, size);
2291
2292 if (vmi->type == VMEM_SHMATED) {
2293 return uncommit_shmated_memory(addr, size);
2294 } else {
2295 return uncommit_mmaped_memory(addr, size);
2296 }
2297 }
2298
2299 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2300 // Do not call this; no need to commit stack pages on AIX.
2301 ShouldNotReachHere();
2302 return true;
2303 }
2304
2305 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2306 // Do not call this; no need to commit stack pages on AIX.
2307 ShouldNotReachHere();
2308 return true;
2309 }
2310
2311 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2312 }
2313
2314 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2315 }
2316
2317 void os::numa_make_global(char *addr, size_t bytes) {
2318 }
2319
2320 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2321 }
2322
2323 bool os::numa_topology_changed() {
2324 return false;
2325 }
2326
2327 size_t os::numa_get_groups_num() {
2328 return 1;
2329 }
2330
2331 int os::numa_get_group_id() {
2332 return 0;
2333 }
2334
2335 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2336 if (size > 0) {
2337 ids[0] = 0;
2338 return 1;
2339 }
2340 return 0;
2341 }
2342
2343 int os::numa_get_group_id_for_address(const void* address) {
2344 return 0;
2345 }
2346
2347 bool os::get_page_info(char *start, page_info* info) {
2348 return false;
2349 }
2350
2351 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2352 return end;
2353 }
2354
2355 // Reserves and attaches a shared memory segment.
2356 // Will assert if a wish address is given and could not be obtained.
2357 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2358
2359 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2360 // thereby clobbering old mappings at that place. That is probably
2361 // not intended, never used and almost certainly an error were it
2362 // ever be used this way (to try attaching at a specified address
2363 // without clobbering old mappings an alternate API exists,
2364 // os::attempt_reserve_memory_at()).
2365 // Instead of mimicking the dangerous coding of the other platforms, here I
2366 // just ignore the request address (release) or assert(debug).
2367 assert0(requested_addr == NULL);
2368
2369 // Always round to os::vm_page_size(), which may be larger than 4K.
2370 bytes = align_up(bytes, os::vm_page_size());
2371 const size_t alignment_hint0 =
2372 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2373
2374 // In 4K mode always use mmap.
2375 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2376 if (os::vm_page_size() == 4*K) {
2377 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2378 } else {
2379 if (bytes >= Use64KPagesThreshold) {
2380 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2381 } else {
2382 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2383 }
2384 }
2385 }
2386
2387 bool os::pd_release_memory(char* addr, size_t size) {
2388
2389 // Dynamically do different things for mmap/shmat.
2390 vmembk_t* const vmi = vmembk_find(addr);
2391 guarantee0(vmi);
2392
2393 // Always round to os::vm_page_size(), which may be larger than 4K.
2394 size = align_up(size, os::vm_page_size());
2395 addr = align_up(addr, os::vm_page_size());
2396
2397 bool rc = false;
2398 bool remove_bookkeeping = false;
2399 if (vmi->type == VMEM_SHMATED) {
2400 // For shmatted memory, we do:
2401 // - If user wants to release the whole range, release the memory (shmdt).
2402 // - If user only wants to release a partial range, uncommit (disclaim) that
2403 // range. That way, at least, we do not use memory anymore (bust still page
2404 // table space).
2405 vmi->assert_is_valid_subrange(addr, size);
2406 if (addr == vmi->addr && size == vmi->size) {
2407 rc = release_shmated_memory(addr, size);
2408 remove_bookkeeping = true;
2409 } else {
2410 rc = uncommit_shmated_memory(addr, size);
2411 }
2412 } else {
2413 // User may unmap partial regions but region has to be fully contained.
2414 #ifdef ASSERT
2415 vmi->assert_is_valid_subrange(addr, size);
2416 #endif
2417 rc = release_mmaped_memory(addr, size);
2418 remove_bookkeeping = true;
2419 }
2420
2421 // update bookkeeping
2422 if (rc && remove_bookkeeping) {
2423 vmembk_remove(vmi);
2424 }
2425
2426 return rc;
2427 }
2428
2429 static bool checked_mprotect(char* addr, size_t size, int prot) {
2430
2431 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2432 // not tell me if protection failed when trying to protect an un-protectable range.
2433 //
2434 // This means if the memory was allocated using shmget/shmat, protection wont work
2435 // but mprotect will still return 0:
2436 //
2437 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2438
2439 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2440 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2441
2442 if (!rc) {
2443 const char* const s_errno = os::errno_name(errno);
2444 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2445 return false;
2446 }
2447
2448 // mprotect success check
2449 //
2450 // Mprotect said it changed the protection but can I believe it?
2451 //
2452 // To be sure I need to check the protection afterwards. Try to
2453 // read from protected memory and check whether that causes a segfault.
2454 //
2455 if (!os::Aix::xpg_sus_mode()) {
2456
2457 if (CanUseSafeFetch32()) {
2458
2459 const bool read_protected =
2460 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2461 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2462
2463 if (prot & PROT_READ) {
2464 rc = !read_protected;
2465 } else {
2466 rc = read_protected;
2467 }
2468
2469 if (!rc) {
2470 if (os::Aix::on_pase()) {
2471 // There is an issue on older PASE systems where mprotect() will return success but the
2472 // memory will not be protected.
2473 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2474 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2475 // a stack. It is an OS error.
2476 //
2477 // A valid strategy is just to try again. This usually works. :-/
2478
2479 ::usleep(1000);
2480 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2481 if (::mprotect(addr, size, prot) == 0) {
2482 const bool read_protected_2 =
2483 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2484 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2485 rc = true;
2486 }
2487 }
2488 }
2489 }
2490 }
2491
2492 assert(rc == true, "mprotect failed.");
2493
2494 return rc;
2495 }
2496
2497 // Set protections specified
2498 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2499 unsigned int p = 0;
2500 switch (prot) {
2501 case MEM_PROT_NONE: p = PROT_NONE; break;
2502 case MEM_PROT_READ: p = PROT_READ; break;
2503 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2504 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2505 default:
2506 ShouldNotReachHere();
2507 }
2508 // is_committed is unused.
2509 return checked_mprotect(addr, size, p);
2510 }
2511
2512 bool os::guard_memory(char* addr, size_t size) {
2513 return checked_mprotect(addr, size, PROT_NONE);
2514 }
2515
2516 bool os::unguard_memory(char* addr, size_t size) {
2517 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2518 }
2519
2520 // Large page support
2521
2522 static size_t _large_page_size = 0;
2523
2524 // Enable large page support if OS allows that.
2525 void os::large_page_init() {
2526 return; // Nothing to do. See query_multipage_support and friends.
2527 }
2528
2529 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2530 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2531 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2532 // so this is not needed.
2533 assert(false, "should not be called on AIX");
2534 return NULL;
2535 }
2536
2537 bool os::release_memory_special(char* base, size_t bytes) {
2538 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2539 Unimplemented();
2540 return false;
2541 }
2542
2543 size_t os::large_page_size() {
2544 return _large_page_size;
2545 }
2546
2547 bool os::can_commit_large_page_memory() {
2548 // Does not matter, we do not support huge pages.
2549 return false;
2550 }
2551
2552 bool os::can_execute_large_page_memory() {
2553 // Does not matter, we do not support huge pages.
2554 return false;
2555 }
2556
2557 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2558 assert(file_desc >= 0, "file_desc is not valid");
2559 char* result = NULL;
2560
2561 // Always round to os::vm_page_size(), which may be larger than 4K.
2562 bytes = align_up(bytes, os::vm_page_size());
2563 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2564
2565 if (result != NULL) {
2566 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2567 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2568 }
2569 }
2570 return result;
2571 }
2572
2573 // Reserve memory at an arbitrary address, only if that area is
2574 // available (and not reserved for something else).
2575 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2576 char* addr = NULL;
2577
2578 // Always round to os::vm_page_size(), which may be larger than 4K.
2579 bytes = align_up(bytes, os::vm_page_size());
2580
2581 // In 4K mode always use mmap.
2582 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2583 if (os::vm_page_size() == 4*K) {
2584 return reserve_mmaped_memory(bytes, requested_addr, 0);
2585 } else {
2586 if (bytes >= Use64KPagesThreshold) {
2587 return reserve_shmated_memory(bytes, requested_addr, 0);
2588 } else {
2589 return reserve_mmaped_memory(bytes, requested_addr, 0);
2590 }
2591 }
2592
2593 return addr;
2594 }
2595
2596 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2597 void os::infinite_sleep() {
2598 while (true) { // sleep forever ...
2599 ::sleep(100); // ... 100 seconds at a time
2600 }
2601 }
2602
2603 // Used to convert frequent JVM_Yield() to nops
2604 bool os::dont_yield() {
2605 return DontYieldALot;
2606 }
2607
2608 void os::naked_yield() {
2609 sched_yield();
2610 }
2611
2612 ////////////////////////////////////////////////////////////////////////////////
2613 // thread priority support
2614
2615 // From AIX manpage to pthread_setschedparam
2616 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2617 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2618 //
2619 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2620 // range from 40 to 80, where 40 is the least favored priority and 80
2621 // is the most favored."
2622 //
2623 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2624 // scheduling there; however, this still leaves iSeries.)
2625 //
2626 // We use the same values for AIX and PASE.
2627 int os::java_to_os_priority[CriticalPriority + 1] = {
2628 54, // 0 Entry should never be used
2629
2630 55, // 1 MinPriority
2631 55, // 2
2632 56, // 3
2633
2634 56, // 4
2635 57, // 5 NormPriority
2636 57, // 6
2637
2638 58, // 7
2639 58, // 8
2640 59, // 9 NearMaxPriority
2641
2642 60, // 10 MaxPriority
2643
2644 60 // 11 CriticalPriority
2645 };
2646
2647 static int prio_init() {
2648 if (ThreadPriorityPolicy == 1) {
2649 if (geteuid() != 0) {
2650 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2651 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2652 "e.g., being the root user. If the necessary permission is not " \
2653 "possessed, changes to priority will be silently ignored.");
2654 }
2655 }
2656 }
2657 if (UseCriticalJavaThreadPriority) {
2658 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2659 }
2660 return 0;
2661 }
2662
2663 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2664 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2665 pthread_t thr = thread->osthread()->pthread_id();
2666 int policy = SCHED_OTHER;
2667 struct sched_param param;
2668 param.sched_priority = newpri;
2669 int ret = pthread_setschedparam(thr, policy, ¶m);
2670
2671 if (ret != 0) {
2672 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2673 (int)thr, newpri, ret, os::errno_name(ret));
2674 }
2675 return (ret == 0) ? OS_OK : OS_ERR;
2676 }
2677
2678 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2679 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2680 *priority_ptr = java_to_os_priority[NormPriority];
2681 return OS_OK;
2682 }
2683 pthread_t thr = thread->osthread()->pthread_id();
2684 int policy = SCHED_OTHER;
2685 struct sched_param param;
2686 int ret = pthread_getschedparam(thr, &policy, ¶m);
2687 *priority_ptr = param.sched_priority;
2688
2689 return (ret == 0) ? OS_OK : OS_ERR;
2690 }
2691
2692 ////////////////////////////////////////////////////////////////////////////////
2693 // suspend/resume support
2694
2695 // The low-level signal-based suspend/resume support is a remnant from the
2696 // old VM-suspension that used to be for java-suspension, safepoints etc,
2697 // within hotspot. Currently used by JFR's OSThreadSampler
2698 //
2699 // The remaining code is greatly simplified from the more general suspension
2700 // code that used to be used.
2701 //
2702 // The protocol is quite simple:
2703 // - suspend:
2704 // - sends a signal to the target thread
2705 // - polls the suspend state of the osthread using a yield loop
2706 // - target thread signal handler (SR_handler) sets suspend state
2707 // and blocks in sigsuspend until continued
2708 // - resume:
2709 // - sets target osthread state to continue
2710 // - sends signal to end the sigsuspend loop in the SR_handler
2711 //
2712 // Note that the SR_lock plays no role in this suspend/resume protocol,
2713 // but is checked for NULL in SR_handler as a thread termination indicator.
2714 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2715 //
2716 // Note that resume_clear_context() and suspend_save_context() are needed
2717 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2718 // which in part is used by:
2719 // - Forte Analyzer: AsyncGetCallTrace()
2720 // - StackBanging: get_frame_at_stack_banging_point()
2721
2722 static void resume_clear_context(OSThread *osthread) {
2723 osthread->set_ucontext(NULL);
2724 osthread->set_siginfo(NULL);
2725 }
2726
2727 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2728 osthread->set_ucontext(context);
2729 osthread->set_siginfo(siginfo);
2730 }
2731
2732 //
2733 // Handler function invoked when a thread's execution is suspended or
2734 // resumed. We have to be careful that only async-safe functions are
2735 // called here (Note: most pthread functions are not async safe and
2736 // should be avoided.)
2737 //
2738 // Note: sigwait() is a more natural fit than sigsuspend() from an
2739 // interface point of view, but sigwait() prevents the signal hander
2740 // from being run. libpthread would get very confused by not having
2741 // its signal handlers run and prevents sigwait()'s use with the
2742 // mutex granting granting signal.
2743 //
2744 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2745 //
2746 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2747 // Save and restore errno to avoid confusing native code with EINTR
2748 // after sigsuspend.
2749 int old_errno = errno;
2750
2751 Thread* thread = Thread::current_or_null_safe();
2752 assert(thread != NULL, "Missing current thread in SR_handler");
2753
2754 // On some systems we have seen signal delivery get "stuck" until the signal
2755 // mask is changed as part of thread termination. Check that the current thread
2756 // has not already terminated (via SR_lock()) - else the following assertion
2757 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2758 // destructor has completed.
2759
2760 if (thread->SR_lock() == NULL) {
2761 return;
2762 }
2763
2764 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2765
2766 OSThread* osthread = thread->osthread();
2767
2768 os::SuspendResume::State current = osthread->sr.state();
2769 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2770 suspend_save_context(osthread, siginfo, context);
2771
2772 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2773 os::SuspendResume::State state = osthread->sr.suspended();
2774 if (state == os::SuspendResume::SR_SUSPENDED) {
2775 sigset_t suspend_set; // signals for sigsuspend()
2776 sigemptyset(&suspend_set);
2777 // get current set of blocked signals and unblock resume signal
2778 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2779 sigdelset(&suspend_set, SR_signum);
2780
2781 // wait here until we are resumed
2782 while (1) {
2783 sigsuspend(&suspend_set);
2784
2785 os::SuspendResume::State result = osthread->sr.running();
2786 if (result == os::SuspendResume::SR_RUNNING) {
2787 break;
2788 }
2789 }
2790
2791 } else if (state == os::SuspendResume::SR_RUNNING) {
2792 // request was cancelled, continue
2793 } else {
2794 ShouldNotReachHere();
2795 }
2796
2797 resume_clear_context(osthread);
2798 } else if (current == os::SuspendResume::SR_RUNNING) {
2799 // request was cancelled, continue
2800 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2801 // ignore
2802 } else {
2803 ShouldNotReachHere();
2804 }
2805
2806 errno = old_errno;
2807 }
2808
2809 static int SR_initialize() {
2810 struct sigaction act;
2811 char *s;
2812 // Get signal number to use for suspend/resume
2813 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2814 int sig = ::strtol(s, 0, 10);
2815 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2816 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2817 SR_signum = sig;
2818 } else {
2819 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2820 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2821 }
2822 }
2823
2824 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2825 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2826
2827 sigemptyset(&SR_sigset);
2828 sigaddset(&SR_sigset, SR_signum);
2829
2830 // Set up signal handler for suspend/resume.
2831 act.sa_flags = SA_RESTART|SA_SIGINFO;
2832 act.sa_handler = (void (*)(int)) SR_handler;
2833
2834 // SR_signum is blocked by default.
2835 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2836
2837 if (sigaction(SR_signum, &act, 0) == -1) {
2838 return -1;
2839 }
2840
2841 // Save signal flag
2842 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2843 return 0;
2844 }
2845
2846 static int SR_finalize() {
2847 return 0;
2848 }
2849
2850 static int sr_notify(OSThread* osthread) {
2851 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2852 assert_status(status == 0, status, "pthread_kill");
2853 return status;
2854 }
2855
2856 // "Randomly" selected value for how long we want to spin
2857 // before bailing out on suspending a thread, also how often
2858 // we send a signal to a thread we want to resume
2859 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2860 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2861
2862 // returns true on success and false on error - really an error is fatal
2863 // but this seems the normal response to library errors
2864 static bool do_suspend(OSThread* osthread) {
2865 assert(osthread->sr.is_running(), "thread should be running");
2866 // mark as suspended and send signal
2867
2868 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2869 // failed to switch, state wasn't running?
2870 ShouldNotReachHere();
2871 return false;
2872 }
2873
2874 if (sr_notify(osthread) != 0) {
2875 // try to cancel, switch to running
2876
2877 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2878 if (result == os::SuspendResume::SR_RUNNING) {
2879 // cancelled
2880 return false;
2881 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2882 // somehow managed to suspend
2883 return true;
2884 } else {
2885 ShouldNotReachHere();
2886 return false;
2887 }
2888 }
2889
2890 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2891
2892 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2893 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2894 os::naked_yield();
2895 }
2896
2897 // timeout, try to cancel the request
2898 if (n >= RANDOMLY_LARGE_INTEGER) {
2899 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2900 if (cancelled == os::SuspendResume::SR_RUNNING) {
2901 return false;
2902 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2903 return true;
2904 } else {
2905 ShouldNotReachHere();
2906 return false;
2907 }
2908 }
2909 }
2910
2911 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2912 return true;
2913 }
2914
2915 static void do_resume(OSThread* osthread) {
2916 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2917
2918 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2919 // failed to switch to WAKEUP_REQUEST
2920 ShouldNotReachHere();
2921 return;
2922 }
2923
2924 while (!osthread->sr.is_running()) {
2925 if (sr_notify(osthread) == 0) {
2926 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2927 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2928 os::naked_yield();
2929 }
2930 }
2931 } else {
2932 ShouldNotReachHere();
2933 }
2934 }
2935
2936 guarantee(osthread->sr.is_running(), "Must be running!");
2937 }
2938
2939 ///////////////////////////////////////////////////////////////////////////////////
2940 // signal handling (except suspend/resume)
2941
2942 // This routine may be used by user applications as a "hook" to catch signals.
2943 // The user-defined signal handler must pass unrecognized signals to this
2944 // routine, and if it returns true (non-zero), then the signal handler must
2945 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2946 // routine will never retun false (zero), but instead will execute a VM panic
2947 // routine kill the process.
2948 //
2949 // If this routine returns false, it is OK to call it again. This allows
2950 // the user-defined signal handler to perform checks either before or after
2951 // the VM performs its own checks. Naturally, the user code would be making
2952 // a serious error if it tried to handle an exception (such as a null check
2953 // or breakpoint) that the VM was generating for its own correct operation.
2954 //
2955 // This routine may recognize any of the following kinds of signals:
2956 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2957 // It should be consulted by handlers for any of those signals.
2958 //
2959 // The caller of this routine must pass in the three arguments supplied
2960 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2961 // field of the structure passed to sigaction(). This routine assumes that
2962 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2963 //
2964 // Note that the VM will print warnings if it detects conflicting signal
2965 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2966 //
2967 extern "C" JNIEXPORT int
2968 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2969
2970 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2971 // to be the thing to call; documentation is not terribly clear about whether
2972 // pthread_sigmask also works, and if it does, whether it does the same.
2973 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2974 const int rc = ::pthread_sigmask(how, set, oset);
2975 // return value semantics differ slightly for error case:
2976 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2977 // (so, pthread_sigmask is more theadsafe for error handling)
2978 // But success is always 0.
2979 return rc == 0 ? true : false;
2980 }
2981
2982 // Function to unblock all signals which are, according
2983 // to POSIX, typical program error signals. If they happen while being blocked,
2984 // they typically will bring down the process immediately.
2985 bool unblock_program_error_signals() {
2986 sigset_t set;
2987 ::sigemptyset(&set);
2988 ::sigaddset(&set, SIGILL);
2989 ::sigaddset(&set, SIGBUS);
2990 ::sigaddset(&set, SIGFPE);
2991 ::sigaddset(&set, SIGSEGV);
2992 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2993 }
2994
2995 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2996 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2997 assert(info != NULL && uc != NULL, "it must be old kernel");
2998
2999 // Never leave program error signals blocked;
3000 // on all our platforms they would bring down the process immediately when
3001 // getting raised while being blocked.
3002 unblock_program_error_signals();
3003
3004 int orig_errno = errno; // Preserve errno value over signal handler.
3005 JVM_handle_aix_signal(sig, info, uc, true);
3006 errno = orig_errno;
3007 }
3008
3009 // This boolean allows users to forward their own non-matching signals
3010 // to JVM_handle_aix_signal, harmlessly.
3011 bool os::Aix::signal_handlers_are_installed = false;
3012
3013 // For signal-chaining
3014 bool os::Aix::libjsig_is_loaded = false;
3015 typedef struct sigaction *(*get_signal_t)(int);
3016 get_signal_t os::Aix::get_signal_action = NULL;
3017
3018 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3019 struct sigaction *actp = NULL;
3020
3021 if (libjsig_is_loaded) {
3022 // Retrieve the old signal handler from libjsig
3023 actp = (*get_signal_action)(sig);
3024 }
3025 if (actp == NULL) {
3026 // Retrieve the preinstalled signal handler from jvm
3027 actp = os::Posix::get_preinstalled_handler(sig);
3028 }
3029
3030 return actp;
3031 }
3032
3033 static bool call_chained_handler(struct sigaction *actp, int sig,
3034 siginfo_t *siginfo, void *context) {
3035 // Call the old signal handler
3036 if (actp->sa_handler == SIG_DFL) {
3037 // It's more reasonable to let jvm treat it as an unexpected exception
3038 // instead of taking the default action.
3039 return false;
3040 } else if (actp->sa_handler != SIG_IGN) {
3041 if ((actp->sa_flags & SA_NODEFER) == 0) {
3042 // automaticlly block the signal
3043 sigaddset(&(actp->sa_mask), sig);
3044 }
3045
3046 sa_handler_t hand = NULL;
3047 sa_sigaction_t sa = NULL;
3048 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3049 // retrieve the chained handler
3050 if (siginfo_flag_set) {
3051 sa = actp->sa_sigaction;
3052 } else {
3053 hand = actp->sa_handler;
3054 }
3055
3056 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3057 actp->sa_handler = SIG_DFL;
3058 }
3059
3060 // try to honor the signal mask
3061 sigset_t oset;
3062 sigemptyset(&oset);
3063 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3064
3065 // call into the chained handler
3066 if (siginfo_flag_set) {
3067 (*sa)(sig, siginfo, context);
3068 } else {
3069 (*hand)(sig);
3070 }
3071
3072 // restore the signal mask
3073 pthread_sigmask(SIG_SETMASK, &oset, NULL);
3074 }
3075 // Tell jvm's signal handler the signal is taken care of.
3076 return true;
3077 }
3078
3079 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3080 bool chained = false;
3081 // signal-chaining
3082 if (UseSignalChaining) {
3083 struct sigaction *actp = get_chained_signal_action(sig);
3084 if (actp != NULL) {
3085 chained = call_chained_handler(actp, sig, siginfo, context);
3086 }
3087 }
3088 return chained;
3089 }
3090
3091 // for diagnostic
3092 int sigflags[NSIG];
3093
3094 int os::Aix::get_our_sigflags(int sig) {
3095 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3096 return sigflags[sig];
3097 }
3098
3099 void os::Aix::set_our_sigflags(int sig, int flags) {
3100 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3101 if (sig > 0 && sig < NSIG) {
3102 sigflags[sig] = flags;
3103 }
3104 }
3105
3106 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3107 // Check for overwrite.
3108 struct sigaction oldAct;
3109 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3110
3111 void* oldhand = oldAct.sa_sigaction
3112 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3113 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3114 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3115 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3116 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3117 if (AllowUserSignalHandlers || !set_installed) {
3118 // Do not overwrite; user takes responsibility to forward to us.
3119 return;
3120 } else if (UseSignalChaining) {
3121 // save the old handler in jvm
3122 os::Posix::save_preinstalled_handler(sig, oldAct);
3123 // libjsig also interposes the sigaction() call below and saves the
3124 // old sigaction on it own.
3125 } else {
3126 fatal("Encountered unexpected pre-existing sigaction handler "
3127 "%#lx for signal %d.", (long)oldhand, sig);
3128 }
3129 }
3130
3131 struct sigaction sigAct;
3132 sigfillset(&(sigAct.sa_mask));
3133 if (!set_installed) {
3134 sigAct.sa_handler = SIG_DFL;
3135 sigAct.sa_flags = SA_RESTART;
3136 } else {
3137 sigAct.sa_sigaction = javaSignalHandler;
3138 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3139 }
3140 // Save flags, which are set by ours
3141 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3142 sigflags[sig] = sigAct.sa_flags;
3143
3144 int ret = sigaction(sig, &sigAct, &oldAct);
3145 assert(ret == 0, "check");
3146
3147 void* oldhand2 = oldAct.sa_sigaction
3148 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3149 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3150 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3151 }
3152
3153 // install signal handlers for signals that HotSpot needs to
3154 // handle in order to support Java-level exception handling.
3155 void os::Aix::install_signal_handlers() {
3156 if (!signal_handlers_are_installed) {
3157 signal_handlers_are_installed = true;
3158
3159 // signal-chaining
3160 typedef void (*signal_setting_t)();
3161 signal_setting_t begin_signal_setting = NULL;
3162 signal_setting_t end_signal_setting = NULL;
3163 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3164 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3165 if (begin_signal_setting != NULL) {
3166 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3167 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3168 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3169 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3170 libjsig_is_loaded = true;
3171 assert(UseSignalChaining, "should enable signal-chaining");
3172 }
3173 if (libjsig_is_loaded) {
3174 // Tell libjsig jvm is setting signal handlers.
3175 (*begin_signal_setting)();
3176 }
3177
3178 set_signal_handler(SIGSEGV, true);
3179 set_signal_handler(SIGPIPE, true);
3180 set_signal_handler(SIGBUS, true);
3181 set_signal_handler(SIGILL, true);
3182 set_signal_handler(SIGFPE, true);
3183 set_signal_handler(SIGTRAP, true);
3184 set_signal_handler(SIGXFSZ, true);
3185
3186 if (libjsig_is_loaded) {
3187 // Tell libjsig jvm finishes setting signal handlers.
3188 (*end_signal_setting)();
3189 }
3190
3191 // We don't activate signal checker if libjsig is in place, we trust ourselves
3192 // and if UserSignalHandler is installed all bets are off.
3193 // Log that signal checking is off only if -verbose:jni is specified.
3194 if (CheckJNICalls) {
3195 if (libjsig_is_loaded) {
3196 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3197 check_signals = false;
3198 }
3199 if (AllowUserSignalHandlers) {
3200 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3201 check_signals = false;
3202 }
3203 // Need to initialize check_signal_done.
3204 ::sigemptyset(&check_signal_done);
3205 }
3206 }
3207 }
3208
3209 static const char* get_signal_handler_name(address handler,
3210 char* buf, int buflen) {
3211 int offset;
3212 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3213 if (found) {
3214 // skip directory names
3215 const char *p1, *p2;
3216 p1 = buf;
3217 size_t len = strlen(os::file_separator());
3218 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3219 // The way os::dll_address_to_library_name is implemented on Aix
3220 // right now, it always returns -1 for the offset which is not
3221 // terribly informative.
3222 // Will fix that. For now, omit the offset.
3223 jio_snprintf(buf, buflen, "%s", p1);
3224 } else {
3225 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3226 }
3227 return buf;
3228 }
3229
3230 static void print_signal_handler(outputStream* st, int sig,
3231 char* buf, size_t buflen) {
3232 struct sigaction sa;
3233 sigaction(sig, NULL, &sa);
3234
3235 st->print("%s: ", os::exception_name(sig, buf, buflen));
3236
3237 address handler = (sa.sa_flags & SA_SIGINFO)
3238 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3239 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3240
3241 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3242 st->print("SIG_DFL");
3243 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3244 st->print("SIG_IGN");
3245 } else {
3246 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3247 }
3248
3249 // Print readable mask.
3250 st->print(", sa_mask[0]=");
3251 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3252
3253 address rh = VMError::get_resetted_sighandler(sig);
3254 // May be, handler was resetted by VMError?
3255 if (rh != NULL) {
3256 handler = rh;
3257 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3258 }
3259
3260 // Print textual representation of sa_flags.
3261 st->print(", sa_flags=");
3262 os::Posix::print_sa_flags(st, sa.sa_flags);
3263
3264 // Check: is it our handler?
3265 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3266 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3267 // It is our signal handler.
3268 // Check for flags, reset system-used one!
3269 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3270 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3271 os::Aix::get_our_sigflags(sig));
3272 }
3273 }
3274 st->cr();
3275 }
3276
3277 #define DO_SIGNAL_CHECK(sig) \
3278 if (!sigismember(&check_signal_done, sig)) \
3279 os::Aix::check_signal_handler(sig)
3280
3281 // This method is a periodic task to check for misbehaving JNI applications
3282 // under CheckJNI, we can add any periodic checks here
3283
3284 void os::run_periodic_checks() {
3285
3286 if (check_signals == false) return;
3287
3288 // SEGV and BUS if overridden could potentially prevent
3289 // generation of hs*.log in the event of a crash, debugging
3290 // such a case can be very challenging, so we absolutely
3291 // check the following for a good measure:
3292 DO_SIGNAL_CHECK(SIGSEGV);
3293 DO_SIGNAL_CHECK(SIGILL);
3294 DO_SIGNAL_CHECK(SIGFPE);
3295 DO_SIGNAL_CHECK(SIGBUS);
3296 DO_SIGNAL_CHECK(SIGPIPE);
3297 DO_SIGNAL_CHECK(SIGXFSZ);
3298 if (UseSIGTRAP) {
3299 DO_SIGNAL_CHECK(SIGTRAP);
3300 }
3301
3302 // ReduceSignalUsage allows the user to override these handlers
3303 // see comments at the very top and jvm_md.h
3304 if (!ReduceSignalUsage) {
3305 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3306 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3307 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3308 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3309 }
3310
3311 DO_SIGNAL_CHECK(SR_signum);
3312 }
3313
3314 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3315
3316 static os_sigaction_t os_sigaction = NULL;
3317
3318 void os::Aix::check_signal_handler(int sig) {
3319 char buf[O_BUFLEN];
3320 address jvmHandler = NULL;
3321
3322 struct sigaction act;
3323 if (os_sigaction == NULL) {
3324 // only trust the default sigaction, in case it has been interposed
3325 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3326 if (os_sigaction == NULL) return;
3327 }
3328
3329 os_sigaction(sig, (struct sigaction*)NULL, &act);
3330
3331 address thisHandler = (act.sa_flags & SA_SIGINFO)
3332 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3333 : CAST_FROM_FN_PTR(address, act.sa_handler);
3334
3335 switch(sig) {
3336 case SIGSEGV:
3337 case SIGBUS:
3338 case SIGFPE:
3339 case SIGPIPE:
3340 case SIGILL:
3341 case SIGXFSZ:
3342 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3343 break;
3344
3345 case SHUTDOWN1_SIGNAL:
3346 case SHUTDOWN2_SIGNAL:
3347 case SHUTDOWN3_SIGNAL:
3348 case BREAK_SIGNAL:
3349 jvmHandler = (address)user_handler();
3350 break;
3351
3352 default:
3353 if (sig == SR_signum) {
3354 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3355 } else {
3356 return;
3357 }
3358 break;
3359 }
3360
3361 if (thisHandler != jvmHandler) {
3362 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3363 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3364 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3365 // No need to check this sig any longer
3366 sigaddset(&check_signal_done, sig);
3367 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3368 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3369 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3370 exception_name(sig, buf, O_BUFLEN));
3371 }
3372 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3373 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3374 tty->print("expected:");
3375 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3376 tty->cr();
3377 tty->print(" found:");
3378 os::Posix::print_sa_flags(tty, act.sa_flags);
3379 tty->cr();
3380 // No need to check this sig any longer
3381 sigaddset(&check_signal_done, sig);
3382 }
3383
3384 // Dump all the signal
3385 if (sigismember(&check_signal_done, sig)) {
3386 print_signal_handlers(tty, buf, O_BUFLEN);
3387 }
3388 }
3389
3390 // To install functions for atexit system call
3391 extern "C" {
3392 static void perfMemory_exit_helper() {
3393 perfMemory_exit();
3394 }
3395 }
3396
3397 // This is called _before_ the most of global arguments have been parsed.
3398 void os::init(void) {
3399 // This is basic, we want to know if that ever changes.
3400 // (Shared memory boundary is supposed to be a 256M aligned.)
3401 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3402
3403 // Record process break at startup.
3404 g_brk_at_startup = (address) ::sbrk(0);
3405 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3406
3407 // First off, we need to know whether we run on AIX or PASE, and
3408 // the OS level we run on.
3409 os::Aix::initialize_os_info();
3410
3411 // Scan environment (SPEC1170 behaviour, etc).
3412 os::Aix::scan_environment();
3413
3414 // Probe multipage support.
3415 query_multipage_support();
3416
3417 // Act like we only have one page size by eliminating corner cases which
3418 // we did not support very well anyway.
3419 // We have two input conditions:
3420 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3421 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3422 // setting.
3423 // Data segment page size is important for us because it defines the thread stack page
3424 // size, which is needed for guard page handling, stack banging etc.
3425 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3426 // and should be allocated with 64k pages.
3427 //
3428 // So, we do the following:
3429 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3430 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3431 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3432 // 64k no --- AIX 5.2 ? ---
3433 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3434
3435 // We explicitly leave no option to change page size, because only upgrading would work,
3436 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3437
3438 if (g_multipage_support.datapsize == 4*K) {
3439 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3440 if (g_multipage_support.can_use_64K_pages) {
3441 // .. but we are able to use 64K pages dynamically.
3442 // This would be typical for java launchers which are not linked
3443 // with datapsize=64K (like, any other launcher but our own).
3444 //
3445 // In this case it would be smart to allocate the java heap with 64K
3446 // to get the performance benefit, and to fake 64k pages for the
3447 // data segment (when dealing with thread stacks).
3448 //
3449 // However, leave a possibility to downgrade to 4K, using
3450 // -XX:-Use64KPages.
3451 if (Use64KPages) {
3452 trcVerbose("64K page mode (faked for data segment)");
3453 Aix::_page_size = 64*K;
3454 } else {
3455 trcVerbose("4K page mode (Use64KPages=off)");
3456 Aix::_page_size = 4*K;
3457 }
3458 } else {
3459 // .. and not able to allocate 64k pages dynamically. Here, just
3460 // fall back to 4K paged mode and use mmap for everything.
3461 trcVerbose("4K page mode");
3462 Aix::_page_size = 4*K;
3463 FLAG_SET_ERGO(Use64KPages, false);
3464 }
3465 } else {
3466 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3467 // This normally means that we can allocate 64k pages dynamically.
3468 // (There is one special case where this may be false: EXTSHM=on.
3469 // but we decided to not support that mode).
3470 assert0(g_multipage_support.can_use_64K_pages);
3471 Aix::_page_size = 64*K;
3472 trcVerbose("64K page mode");
3473 FLAG_SET_ERGO(Use64KPages, true);
3474 }
3475
3476 // For now UseLargePages is just ignored.
3477 FLAG_SET_ERGO(UseLargePages, false);
3478 _page_sizes[0] = 0;
3479
3480 // debug trace
3481 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3482
3483 // Next, we need to initialize libo4 and libperfstat libraries.
3484 if (os::Aix::on_pase()) {
3485 os::Aix::initialize_libo4();
3486 } else {
3487 os::Aix::initialize_libperfstat();
3488 }
3489
3490 // Reset the perfstat information provided by ODM.
3491 if (os::Aix::on_aix()) {
3492 libperfstat::perfstat_reset();
3493 }
3494
3495 // Now initialze basic system properties. Note that for some of the values we
3496 // need libperfstat etc.
3497 os::Aix::initialize_system_info();
3498
3499 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3500
3501 init_random(1234567);
3502
3503 // _main_thread points to the thread that created/loaded the JVM.
3504 Aix::_main_thread = pthread_self();
3505
3506 initial_time_count = javaTimeNanos();
3507
3508 os::Posix::init();
3509 }
3510
3511 // This is called _after_ the global arguments have been parsed.
3512 jint os::init_2(void) {
3513
3514 // This could be set after os::Posix::init() but all platforms
3515 // have to set it the same so we have to mirror Solaris.
3516 DEBUG_ONLY(os::set_mutex_init_done();)
3517
3518 os::Posix::init_2();
3519
3520 if (os::Aix::on_pase()) {
3521 trcVerbose("Running on PASE.");
3522 } else {
3523 trcVerbose("Running on AIX (not PASE).");
3524 }
3525
3526 trcVerbose("processor count: %d", os::_processor_count);
3527 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3528
3529 // Initially build up the loaded dll map.
3530 LoadedLibraries::reload();
3531 if (Verbose) {
3532 trcVerbose("Loaded Libraries: ");
3533 LoadedLibraries::print(tty);
3534 }
3535
3536 // initialize suspend/resume support - must do this before signal_sets_init()
3537 if (SR_initialize() != 0) {
3538 perror("SR_initialize failed");
3539 return JNI_ERR;
3540 }
3541
3542 Aix::signal_sets_init();
3543 Aix::install_signal_handlers();
3544 // Initialize data for jdk.internal.misc.Signal
3545 if (!ReduceSignalUsage) {
3546 jdk_misc_signal_init();
3547 }
3548
3549 // Check and sets minimum stack sizes against command line options
3550 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3551 return JNI_ERR;
3552 }
3553
3554 if (UseNUMA) {
3555 UseNUMA = false;
3556 warning("NUMA optimizations are not available on this OS.");
3557 }
3558
3559 if (MaxFDLimit) {
3560 // Set the number of file descriptors to max. print out error
3561 // if getrlimit/setrlimit fails but continue regardless.
3562 struct rlimit nbr_files;
3563 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3564 if (status != 0) {
3565 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3566 } else {
3567 nbr_files.rlim_cur = nbr_files.rlim_max;
3568 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3569 if (status != 0) {
3570 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3571 }
3572 }
3573 }
3574
3575 if (PerfAllowAtExitRegistration) {
3576 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3577 // At exit functions can be delayed until process exit time, which
3578 // can be problematic for embedded VM situations. Embedded VMs should
3579 // call DestroyJavaVM() to assure that VM resources are released.
3580
3581 // Note: perfMemory_exit_helper atexit function may be removed in
3582 // the future if the appropriate cleanup code can be added to the
3583 // VM_Exit VMOperation's doit method.
3584 if (atexit(perfMemory_exit_helper) != 0) {
3585 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3586 }
3587 }
3588
3589 // initialize thread priority policy
3590 prio_init();
3591
3592 return JNI_OK;
3593 }
3594
3595 // Mark the polling page as unreadable
3596 void os::make_polling_page_unreadable(void) {
3597 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3598 fatal("Could not disable polling page");
3599 }
3600 };
3601
3602 // Mark the polling page as readable
3603 void os::make_polling_page_readable(void) {
3604 // Changed according to os_linux.cpp.
3605 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3606 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3607 }
3608 };
3609
3610 int os::active_processor_count() {
3611 // User has overridden the number of active processors
3612 if (ActiveProcessorCount > 0) {
3613 log_trace(os)("active_processor_count: "
3614 "active processor count set by user : %d",
3615 ActiveProcessorCount);
3616 return ActiveProcessorCount;
3617 }
3618
3619 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3620 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3621 return online_cpus;
3622 }
3623
3624 void os::set_native_thread_name(const char *name) {
3625 // Not yet implemented.
3626 return;
3627 }
3628
3629 bool os::bind_to_processor(uint processor_id) {
3630 // Not yet implemented.
3631 return false;
3632 }
3633
3634 void os::SuspendedThreadTask::internal_do_task() {
3635 if (do_suspend(_thread->osthread())) {
3636 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3637 do_task(context);
3638 do_resume(_thread->osthread());
3639 }
3640 }
3641
3642 ////////////////////////////////////////////////////////////////////////////////
3643 // debug support
3644
3645 bool os::find(address addr, outputStream* st) {
3646
3647 st->print(PTR_FORMAT ": ", addr);
3648
3649 loaded_module_t lm;
3650 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3651 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3652 st->print_cr("%s", lm.path);
3653 return true;
3654 }
3655
3656 return false;
3657 }
3658
3659 ////////////////////////////////////////////////////////////////////////////////
3660 // misc
3661
3662 // This does not do anything on Aix. This is basically a hook for being
3663 // able to use structured exception handling (thread-local exception filters)
3664 // on, e.g., Win32.
3665 void
3666 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3667 JavaCallArguments* args, Thread* thread) {
3668 f(value, method, args, thread);
3669 }
3670
3671 void os::print_statistics() {
3672 }
3673
3674 bool os::message_box(const char* title, const char* message) {
3675 int i;
3676 fdStream err(defaultStream::error_fd());
3677 for (i = 0; i < 78; i++) err.print_raw("=");
3678 err.cr();
3679 err.print_raw_cr(title);
3680 for (i = 0; i < 78; i++) err.print_raw("-");
3681 err.cr();
3682 err.print_raw_cr(message);
3683 for (i = 0; i < 78; i++) err.print_raw("=");
3684 err.cr();
3685
3686 char buf[16];
3687 // Prevent process from exiting upon "read error" without consuming all CPU
3688 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3689
3690 return buf[0] == 'y' || buf[0] == 'Y';
3691 }
3692
3693 // Is a (classpath) directory empty?
3694 bool os::dir_is_empty(const char* path) {
3695 DIR *dir = NULL;
3696 struct dirent *ptr;
3697
3698 dir = opendir(path);
3699 if (dir == NULL) return true;
3700
3701 /* Scan the directory */
3702 bool result = true;
3703 while (result && (ptr = readdir(dir)) != NULL) {
3704 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3705 result = false;
3706 }
3707 }
3708 closedir(dir);
3709 return result;
3710 }
3711
3712 // This code originates from JDK's sysOpen and open64_w
3713 // from src/solaris/hpi/src/system_md.c
3714
3715 int os::open(const char *path, int oflag, int mode) {
3716
3717 if (strlen(path) > MAX_PATH - 1) {
3718 errno = ENAMETOOLONG;
3719 return -1;
3720 }
3721 int fd;
3722
3723 fd = ::open64(path, oflag, mode);
3724 if (fd == -1) return -1;
3725
3726 // If the open succeeded, the file might still be a directory.
3727 {
3728 struct stat64 buf64;
3729 int ret = ::fstat64(fd, &buf64);
3730 int st_mode = buf64.st_mode;
3731
3732 if (ret != -1) {
3733 if ((st_mode & S_IFMT) == S_IFDIR) {
3734 errno = EISDIR;
3735 ::close(fd);
3736 return -1;
3737 }
3738 } else {
3739 ::close(fd);
3740 return -1;
3741 }
3742 }
3743
3744 // All file descriptors that are opened in the JVM and not
3745 // specifically destined for a subprocess should have the
3746 // close-on-exec flag set. If we don't set it, then careless 3rd
3747 // party native code might fork and exec without closing all
3748 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3749 // UNIXProcess.c), and this in turn might:
3750 //
3751 // - cause end-of-file to fail to be detected on some file
3752 // descriptors, resulting in mysterious hangs, or
3753 //
3754 // - might cause an fopen in the subprocess to fail on a system
3755 // suffering from bug 1085341.
3756 //
3757 // (Yes, the default setting of the close-on-exec flag is a Unix
3758 // design flaw.)
3759 //
3760 // See:
3761 // 1085341: 32-bit stdio routines should support file descriptors >255
3762 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3763 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3764 #ifdef FD_CLOEXEC
3765 {
3766 int flags = ::fcntl(fd, F_GETFD);
3767 if (flags != -1)
3768 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3769 }
3770 #endif
3771
3772 return fd;
3773 }
3774
3775 // create binary file, rewriting existing file if required
3776 int os::create_binary_file(const char* path, bool rewrite_existing) {
3777 int oflags = O_WRONLY | O_CREAT;
3778 if (!rewrite_existing) {
3779 oflags |= O_EXCL;
3780 }
3781 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3782 }
3783
3784 // return current position of file pointer
3785 jlong os::current_file_offset(int fd) {
3786 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3787 }
3788
3789 // move file pointer to the specified offset
3790 jlong os::seek_to_file_offset(int fd, jlong offset) {
3791 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3792 }
3793
3794 // This code originates from JDK's sysAvailable
3795 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3796
3797 int os::available(int fd, jlong *bytes) {
3798 jlong cur, end;
3799 int mode;
3800 struct stat64 buf64;
3801
3802 if (::fstat64(fd, &buf64) >= 0) {
3803 mode = buf64.st_mode;
3804 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3805 int n;
3806 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3807 *bytes = n;
3808 return 1;
3809 }
3810 }
3811 }
3812 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3813 return 0;
3814 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3815 return 0;
3816 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3817 return 0;
3818 }
3819 *bytes = end - cur;
3820 return 1;
3821 }
3822
3823 // Map a block of memory.
3824 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3825 char *addr, size_t bytes, bool read_only,
3826 bool allow_exec) {
3827 int prot;
3828 int flags = MAP_PRIVATE;
3829
3830 if (read_only) {
3831 prot = PROT_READ;
3832 flags = MAP_SHARED;
3833 } else {
3834 prot = PROT_READ | PROT_WRITE;
3835 flags = MAP_PRIVATE;
3836 }
3837
3838 if (allow_exec) {
3839 prot |= PROT_EXEC;
3840 }
3841
3842 if (addr != NULL) {
3843 flags |= MAP_FIXED;
3844 }
3845
3846 // Allow anonymous mappings if 'fd' is -1.
3847 if (fd == -1) {
3848 flags |= MAP_ANONYMOUS;
3849 }
3850
3851 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3852 fd, file_offset);
3853 if (mapped_address == MAP_FAILED) {
3854 return NULL;
3855 }
3856 return mapped_address;
3857 }
3858
3859 // Remap a block of memory.
3860 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3861 char *addr, size_t bytes, bool read_only,
3862 bool allow_exec) {
3863 // same as map_memory() on this OS
3864 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3865 allow_exec);
3866 }
3867
3868 // Unmap a block of memory.
3869 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3870 return munmap(addr, bytes) == 0;
3871 }
3872
3873 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3874 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3875 // of a thread.
3876 //
3877 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3878 // the fast estimate available on the platform.
3879
3880 jlong os::current_thread_cpu_time() {
3881 // return user + sys since the cost is the same
3882 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3883 assert(n >= 0, "negative CPU time");
3884 return n;
3885 }
3886
3887 jlong os::thread_cpu_time(Thread* thread) {
3888 // consistent with what current_thread_cpu_time() returns
3889 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3890 assert(n >= 0, "negative CPU time");
3891 return n;
3892 }
3893
3894 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3895 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3896 assert(n >= 0, "negative CPU time");
3897 return n;
3898 }
3899
3900 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3901 bool error = false;
3902
3903 jlong sys_time = 0;
3904 jlong user_time = 0;
3905
3906 // Reimplemented using getthrds64().
3907 //
3908 // Works like this:
3909 // For the thread in question, get the kernel thread id. Then get the
3910 // kernel thread statistics using that id.
3911 //
3912 // This only works of course when no pthread scheduling is used,
3913 // i.e. there is a 1:1 relationship to kernel threads.
3914 // On AIX, see AIXTHREAD_SCOPE variable.
3915
3916 pthread_t pthtid = thread->osthread()->pthread_id();
3917
3918 // retrieve kernel thread id for the pthread:
3919 tid64_t tid = 0;
3920 struct __pthrdsinfo pinfo;
3921 // I just love those otherworldly IBM APIs which force me to hand down
3922 // dummy buffers for stuff I dont care for...
3923 char dummy[1];
3924 int dummy_size = sizeof(dummy);
3925 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3926 dummy, &dummy_size) == 0) {
3927 tid = pinfo.__pi_tid;
3928 } else {
3929 tty->print_cr("pthread_getthrds_np failed.");
3930 error = true;
3931 }
3932
3933 // retrieve kernel timing info for that kernel thread
3934 if (!error) {
3935 struct thrdentry64 thrdentry;
3936 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3937 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3938 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3939 } else {
3940 tty->print_cr("pthread_getthrds_np failed.");
3941 error = true;
3942 }
3943 }
3944
3945 if (p_sys_time) {
3946 *p_sys_time = sys_time;
3947 }
3948
3949 if (p_user_time) {
3950 *p_user_time = user_time;
3951 }
3952
3953 if (error) {
3954 return false;
3955 }
3956
3957 return true;
3958 }
3959
3960 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3961 jlong sys_time;
3962 jlong user_time;
3963
3964 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3965 return -1;
3966 }
3967
3968 return user_sys_cpu_time ? sys_time + user_time : user_time;
3969 }
3970
3971 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3972 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3973 info_ptr->may_skip_backward = false; // elapsed time not wall time
3974 info_ptr->may_skip_forward = false; // elapsed time not wall time
3975 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3976 }
3977
3978 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3979 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3980 info_ptr->may_skip_backward = false; // elapsed time not wall time
3981 info_ptr->may_skip_forward = false; // elapsed time not wall time
3982 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3983 }
3984
3985 bool os::is_thread_cpu_time_supported() {
3986 return true;
3987 }
3988
3989 // System loadavg support. Returns -1 if load average cannot be obtained.
3990 // For now just return the system wide load average (no processor sets).
3991 int os::loadavg(double values[], int nelem) {
3992
3993 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3994 guarantee(values, "argument error");
3995
3996 if (os::Aix::on_pase()) {
3997
3998 // AS/400 PASE: use libo4 porting library
3999 double v[3] = { 0.0, 0.0, 0.0 };
4000
4001 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4002 for (int i = 0; i < nelem; i ++) {
4003 values[i] = v[i];
4004 }
4005 return nelem;
4006 } else {
4007 return -1;
4008 }
4009
4010 } else {
4011
4012 // AIX: use libperfstat
4013 libperfstat::cpuinfo_t ci;
4014 if (libperfstat::get_cpuinfo(&ci)) {
4015 for (int i = 0; i < nelem; i++) {
4016 values[i] = ci.loadavg[i];
4017 }
4018 } else {
4019 return -1;
4020 }
4021 return nelem;
4022 }
4023 }
4024
4025 void os::pause() {
4026 char filename[MAX_PATH];
4027 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4028 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4029 } else {
4030 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4031 }
4032
4033 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4034 if (fd != -1) {
4035 struct stat buf;
4036 ::close(fd);
4037 while (::stat(filename, &buf) == 0) {
4038 (void)::poll(NULL, 0, 100);
4039 }
4040 } else {
4041 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4042 }
4043 }
4044
4045 bool os::is_primordial_thread(void) {
4046 if (pthread_self() == (pthread_t)1) {
4047 return true;
4048 } else {
4049 return false;
4050 }
4051 }
4052
4053 // OS recognitions (PASE/AIX, OS level) call this before calling any
4054 // one of Aix::on_pase(), Aix::os_version() static
4055 void os::Aix::initialize_os_info() {
4056
4057 assert(_on_pase == -1 && _os_version == 0, "already called.");
4058
4059 struct utsname uts;
4060 memset(&uts, 0, sizeof(uts));
4061 strcpy(uts.sysname, "?");
4062 if (::uname(&uts) == -1) {
4063 trcVerbose("uname failed (%d)", errno);
4064 guarantee(0, "Could not determine whether we run on AIX or PASE");
4065 } else {
4066 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4067 "node \"%s\" machine \"%s\"\n",
4068 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4069 const int major = atoi(uts.version);
4070 assert(major > 0, "invalid OS version");
4071 const int minor = atoi(uts.release);
4072 assert(minor > 0, "invalid OS release");
4073 _os_version = (major << 24) | (minor << 16);
4074 char ver_str[20] = {0};
4075 const char* name_str = "unknown OS";
4076 if (strcmp(uts.sysname, "OS400") == 0) {
4077 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4078 _on_pase = 1;
4079 if (os_version_short() < 0x0504) {
4080 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4081 assert(false, "OS/400 release too old.");
4082 }
4083 name_str = "OS/400 (pase)";
4084 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4085 } else if (strcmp(uts.sysname, "AIX") == 0) {
4086 // We run on AIX. We do not support versions older than AIX 7.1.
4087 _on_pase = 0;
4088 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4089 odmWrapper::determine_os_kernel_version(&_os_version);
4090 if (os_version_short() < 0x0701) {
4091 trcVerbose("AIX releases older than AIX 7.1 are not supported.");
4092 assert(false, "AIX release too old.");
4093 }
4094 name_str = "AIX";
4095 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4096 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4097 } else {
4098 assert(false, "%s", name_str);
4099 }
4100 trcVerbose("We run on %s %s", name_str, ver_str);
4101 }
4102
4103 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4104 } // end: os::Aix::initialize_os_info()
4105
4106 // Scan environment for important settings which might effect the VM.
4107 // Trace out settings. Warn about invalid settings and/or correct them.
4108 //
4109 // Must run after os::Aix::initialue_os_info().
4110 void os::Aix::scan_environment() {
4111
4112 char* p;
4113 int rc;
4114
4115 // Warn explicity if EXTSHM=ON is used. That switch changes how
4116 // System V shared memory behaves. One effect is that page size of
4117 // shared memory cannot be change dynamically, effectivly preventing
4118 // large pages from working.
4119 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4120 // recommendation is (in OSS notes) to switch it off.
4121 p = ::getenv("EXTSHM");
4122 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4123 if (p && strcasecmp(p, "ON") == 0) {
4124 _extshm = 1;
4125 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4126 if (!AllowExtshm) {
4127 // We allow under certain conditions the user to continue. However, we want this
4128 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4129 // that the VM is not able to allocate 64k pages for the heap.
4130 // We do not want to run with reduced performance.
4131 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4132 }
4133 } else {
4134 _extshm = 0;
4135 }
4136
4137 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4138 // Not tested, not supported.
4139 //
4140 // Note that it might be worth the trouble to test and to require it, if only to
4141 // get useful return codes for mprotect.
4142 //
4143 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4144 // exec() ? before loading the libjvm ? ....)
4145 p = ::getenv("XPG_SUS_ENV");
4146 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4147 if (p && strcmp(p, "ON") == 0) {
4148 _xpg_sus_mode = 1;
4149 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4150 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4151 // clobber address ranges. If we ever want to support that, we have to do some
4152 // testing first.
4153 guarantee(false, "XPG_SUS_ENV=ON not supported");
4154 } else {
4155 _xpg_sus_mode = 0;
4156 }
4157
4158 if (os::Aix::on_pase()) {
4159 p = ::getenv("QIBM_MULTI_THREADED");
4160 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4161 }
4162
4163 p = ::getenv("LDR_CNTRL");
4164 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4165 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4166 if (p && ::strstr(p, "TEXTPSIZE")) {
4167 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4168 "you may experience hangs or crashes on OS/400 V7R1.");
4169 }
4170 }
4171
4172 p = ::getenv("AIXTHREAD_GUARDPAGES");
4173 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4174
4175 } // end: os::Aix::scan_environment()
4176
4177 // PASE: initialize the libo4 library (PASE porting library).
4178 void os::Aix::initialize_libo4() {
4179 guarantee(os::Aix::on_pase(), "OS/400 only.");
4180 if (!libo4::init()) {
4181 trcVerbose("libo4 initialization failed.");
4182 assert(false, "libo4 initialization failed");
4183 } else {
4184 trcVerbose("libo4 initialized.");
4185 }
4186 }
4187
4188 // AIX: initialize the libperfstat library.
4189 void os::Aix::initialize_libperfstat() {
4190 assert(os::Aix::on_aix(), "AIX only");
4191 if (!libperfstat::init()) {
4192 trcVerbose("libperfstat initialization failed.");
4193 assert(false, "libperfstat initialization failed");
4194 } else {
4195 trcVerbose("libperfstat initialized.");
4196 }
4197 }
4198
4199 /////////////////////////////////////////////////////////////////////////////
4200 // thread stack
4201
4202 // Get the current stack base from the OS (actually, the pthread library).
4203 // Note: usually not page aligned.
4204 address os::current_stack_base() {
4205 AixMisc::stackbounds_t bounds;
4206 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4207 guarantee(rc, "Unable to retrieve stack bounds.");
4208 return bounds.base;
4209 }
4210
4211 // Get the current stack size from the OS (actually, the pthread library).
4212 // Returned size is such that (base - size) is always aligned to page size.
4213 size_t os::current_stack_size() {
4214 AixMisc::stackbounds_t bounds;
4215 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4216 guarantee(rc, "Unable to retrieve stack bounds.");
4217 // Align the returned stack size such that the stack low address
4218 // is aligned to page size (Note: base is usually not and we do not care).
4219 // We need to do this because caller code will assume stack low address is
4220 // page aligned and will place guard pages without checking.
4221 address low = bounds.base - bounds.size;
4222 address low_aligned = (address)align_up(low, os::vm_page_size());
4223 size_t s = bounds.base - low_aligned;
4224 return s;
4225 }
4226
4227 extern char** environ;
4228
4229 // Run the specified command in a separate process. Return its exit value,
4230 // or -1 on failure (e.g. can't fork a new process).
4231 // Unlike system(), this function can be called from signal handler. It
4232 // doesn't block SIGINT et al.
4233 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4234 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL};
4235
4236 pid_t pid = fork();
4237
4238 if (pid < 0) {
4239 // fork failed
4240 return -1;
4241
4242 } else if (pid == 0) {
4243 // child process
4244
4245 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4246 execve("/usr/bin/sh", argv, environ);
4247
4248 // execve failed
4249 _exit(-1);
4250
4251 } else {
4252 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4253 // care about the actual exit code, for now.
4254
4255 int status;
4256
4257 // Wait for the child process to exit. This returns immediately if
4258 // the child has already exited. */
4259 while (waitpid(pid, &status, 0) < 0) {
4260 switch (errno) {
4261 case ECHILD: return 0;
4262 case EINTR: break;
4263 default: return -1;
4264 }
4265 }
4266
4267 if (WIFEXITED(status)) {
4268 // The child exited normally; get its exit code.
4269 return WEXITSTATUS(status);
4270 } else if (WIFSIGNALED(status)) {
4271 // The child exited because of a signal.
4272 // The best value to return is 0x80 + signal number,
4273 // because that is what all Unix shells do, and because
4274 // it allows callers to distinguish between process exit and
4275 // process death by signal.
4276 return 0x80 + WTERMSIG(status);
4277 } else {
4278 // Unknown exit code; pass it through.
4279 return status;
4280 }
4281 }
4282 return -1;
4283 }
4284
4285 // Get the default path to the core file
4286 // Returns the length of the string
4287 int os::get_core_path(char* buffer, size_t bufferSize) {
4288 const char* p = get_current_directory(buffer, bufferSize);
4289
4290 if (p == NULL) {
4291 assert(p != NULL, "failed to get current directory");
4292 return 0;
4293 }
4294
4295 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4296 p, current_process_id());
4297
4298 return strlen(buffer);
4299 }
4300
4301 #ifndef PRODUCT
4302 void TestReserveMemorySpecial_test() {
4303 // No tests available for this platform
4304 }
4305 #endif
4306
4307 bool os::start_debugging(char *buf, int buflen) {
4308 int len = (int)strlen(buf);
4309 char *p = &buf[len];
4310
4311 jio_snprintf(p, buflen -len,
4312 "\n\n"
4313 "Do you want to debug the problem?\n\n"
4314 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4315 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4316 "Otherwise, press RETURN to abort...",
4317 os::current_process_id(),
4318 os::current_thread_id(), thread_self());
4319
4320 bool yes = os::message_box("Unexpected Error", buf);
4321
4322 if (yes) {
4323 // yes, user asked VM to launch debugger
4324 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4325
4326 os::fork_and_exec(buf);
4327 yes = false;
4328 }
4329 return yes;
4330 }
4331
4332 static inline time_t get_mtime(const char* filename) {
4333 struct stat st;
4334 int ret = os::stat(filename, &st);
4335 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
4336 return st.st_mtime;
4337 }
4338
4339 int os::compare_file_modified_times(const char* file1, const char* file2) {
4340 time_t t1 = get_mtime(file1);
4341 time_t t2 = get_mtime(file2);
4342 return t1 - t2;
4343 }
4344
4345 bool os::supports_map_sync() {
4346 return false;
4347 }