1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "libo4.hpp"
41 #include "libperfstat_aix.hpp"
42 #include "libodm_aix.hpp"
43 #include "loadlib_aix.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "misc_aix.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "os_aix.inline.hpp"
49 #include "os_share_aix.hpp"
50 #include "porting_aix.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm_misc.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/extendedPC.hpp"
56 #include "runtime/globals.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/orderAccess.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_5_Compat
135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
136 #endif
137 #ifndef PV_6
138 #define PV_6 0x100000 /* Power PC 6 */
139 #endif
140 #ifndef PV_6_1
141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
142 #endif
143 #ifndef PV_6_Compat
144 #define PV_6_Compat 0x108000 /* Power PC 6 */
145 #endif
146 #ifndef PV_7
147 #define PV_7 0x200000 /* Power PC 7 */
148 #endif
149 #ifndef PV_7_Compat
150 #define PV_7_Compat 0x208000 /* Power PC 7 */
151 #endif
152 #ifndef PV_8
153 #define PV_8 0x300000 /* Power PC 8 */
154 #endif
155 #ifndef PV_8_Compat
156 #define PV_8_Compat 0x308000 /* Power PC 8 */
157 #endif
158
159 static address resolve_function_descriptor_to_code_pointer(address p);
160
161 static void vmembk_print_on(outputStream* os);
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // global variables (for a description see os_aix.hpp)
165
166 julong os::Aix::_physical_memory = 0;
167
168 pthread_t os::Aix::_main_thread = ((pthread_t)0);
169 int os::Aix::_page_size = -1;
170
171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
172 int os::Aix::_on_pase = -1;
173
174 // 0 = uninitialized, otherwise 32 bit number:
175 // 0xVVRRTTSS
176 // VV - major version
177 // RR - minor version
178 // TT - tech level, if known, 0 otherwise
179 // SS - service pack, if known, 0 otherwise
180 uint32_t os::Aix::_os_version = 0;
181
182 // -1 = uninitialized, 0 - no, 1 - yes
183 int os::Aix::_xpg_sus_mode = -1;
184
185 // -1 = uninitialized, 0 - no, 1 - yes
186 int os::Aix::_extshm = -1;
187
188 ////////////////////////////////////////////////////////////////////////////////
189 // local variables
190
191 static volatile jlong max_real_time = 0;
192 static jlong initial_time_count = 0;
193 static int clock_tics_per_sec = 100;
194 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
195 static bool check_signals = true;
196 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
197 static sigset_t SR_sigset;
198
199 // Process break recorded at startup.
200 static address g_brk_at_startup = NULL;
201
202 // This describes the state of multipage support of the underlying
203 // OS. Note that this is of no interest to the outsize world and
204 // therefore should not be defined in AIX class.
205 //
206 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
207 // latter two (16M "large" resp. 16G "huge" pages) require special
208 // setup and are normally not available.
209 //
210 // AIX supports multiple page sizes per process, for:
211 // - Stack (of the primordial thread, so not relevant for us)
212 // - Data - data, bss, heap, for us also pthread stacks
213 // - Text - text code
214 // - shared memory
215 //
216 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
217 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
218 //
219 // For shared memory, page size can be set dynamically via
220 // shmctl(). Different shared memory regions can have different page
221 // sizes.
222 //
223 // More information can be found at AIBM info center:
224 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
225 //
226 static struct {
227 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
228 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
229 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
230 size_t pthr_stack_pagesize; // stack page size of pthread threads
231 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
232 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
233 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
234 int error; // Error describing if something went wrong at multipage init.
235 } g_multipage_support = {
236 (size_t) -1,
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 (size_t) -1,
241 false, false,
242 0
243 };
244
245 // We must not accidentally allocate memory close to the BRK - even if
246 // that would work - because then we prevent the BRK segment from
247 // growing which may result in a malloc OOM even though there is
248 // enough memory. The problem only arises if we shmat() or mmap() at
249 // a specific wish address, e.g. to place the heap in a
250 // compressed-oops-friendly way.
251 static bool is_close_to_brk(address a) {
252 assert0(g_brk_at_startup != NULL);
253 if (a >= g_brk_at_startup &&
254 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
255 return true;
256 }
257 return false;
258 }
259
260 julong os::available_memory() {
261 return Aix::available_memory();
262 }
263
264 julong os::Aix::available_memory() {
265 // Avoid expensive API call here, as returned value will always be null.
266 if (os::Aix::on_pase()) {
267 return 0x0LL;
268 }
269 os::Aix::meminfo_t mi;
270 if (os::Aix::get_meminfo(&mi)) {
271 return mi.real_free;
272 } else {
273 return ULONG_MAX;
274 }
275 }
276
277 julong os::physical_memory() {
278 return Aix::physical_memory();
279 }
280
281 // Return true if user is running as root.
282
283 bool os::have_special_privileges() {
284 static bool init = false;
285 static bool privileges = false;
286 if (!init) {
287 privileges = (getuid() != geteuid()) || (getgid() != getegid());
288 init = true;
289 }
290 return privileges;
291 }
292
293 // Helper function, emulates disclaim64 using multiple 32bit disclaims
294 // because we cannot use disclaim64() on AS/400 and old AIX releases.
295 static bool my_disclaim64(char* addr, size_t size) {
296
297 if (size == 0) {
298 return true;
299 }
300
301 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
302 const unsigned int maxDisclaimSize = 0x40000000;
303
304 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
305 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
306
307 char* p = addr;
308
309 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
310 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
311 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
312 return false;
313 }
314 p += maxDisclaimSize;
315 }
316
317 if (lastDisclaimSize > 0) {
318 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
319 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
320 return false;
321 }
322 }
323
324 return true;
325 }
326
327 // Cpu architecture string
328 #if defined(PPC32)
329 static char cpu_arch[] = "ppc";
330 #elif defined(PPC64)
331 static char cpu_arch[] = "ppc64";
332 #else
333 #error Add appropriate cpu_arch setting
334 #endif
335
336 // Wrap the function "vmgetinfo" which is not available on older OS releases.
337 static int checked_vmgetinfo(void *out, int command, int arg) {
338 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
339 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
340 }
341 return ::vmgetinfo(out, command, arg);
342 }
343
344 // Given an address, returns the size of the page backing that address.
345 size_t os::Aix::query_pagesize(void* addr) {
346
347 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
348 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
349 return 4*K;
350 }
351
352 vm_page_info pi;
353 pi.addr = (uint64_t)addr;
354 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
355 return pi.pagesize;
356 } else {
357 assert(false, "vmgetinfo failed to retrieve page size");
358 return 4*K;
359 }
360 }
361
362 void os::Aix::initialize_system_info() {
363
364 // Get the number of online(logical) cpus instead of configured.
365 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
366 assert(_processor_count > 0, "_processor_count must be > 0");
367
368 // Retrieve total physical storage.
369 os::Aix::meminfo_t mi;
370 if (!os::Aix::get_meminfo(&mi)) {
371 assert(false, "os::Aix::get_meminfo failed.");
372 }
373 _physical_memory = (julong) mi.real_total;
374 }
375
376 // Helper function for tracing page sizes.
377 static const char* describe_pagesize(size_t pagesize) {
378 switch (pagesize) {
379 case 4*K : return "4K";
380 case 64*K: return "64K";
381 case 16*M: return "16M";
382 case 16*G: return "16G";
383 default:
384 assert(false, "surprise");
385 return "??";
386 }
387 }
388
389 // Probe OS for multipage support.
390 // Will fill the global g_multipage_support structure.
391 // Must be called before calling os::large_page_init().
392 static void query_multipage_support() {
393
394 guarantee(g_multipage_support.pagesize == -1,
395 "do not call twice");
396
397 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
398
399 // This really would surprise me.
400 assert(g_multipage_support.pagesize == 4*K, "surprise!");
401
402 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
403 // Default data page size is defined either by linker options (-bdatapsize)
404 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
405 // default should be 4K.
406 {
407 void* p = ::malloc(16*M);
408 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
409 ::free(p);
410 }
411
412 // Query default shm page size (LDR_CNTRL SHMPSIZE).
413 // Note that this is pure curiosity. We do not rely on default page size but set
414 // our own page size after allocated.
415 {
416 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
417 guarantee(shmid != -1, "shmget failed");
418 void* p = ::shmat(shmid, NULL, 0);
419 ::shmctl(shmid, IPC_RMID, NULL);
420 guarantee(p != (void*) -1, "shmat failed");
421 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
422 ::shmdt(p);
423 }
424
425 // Before querying the stack page size, make sure we are not running as primordial
426 // thread (because primordial thread's stack may have different page size than
427 // pthread thread stacks). Running a VM on the primordial thread won't work for a
428 // number of reasons so we may just as well guarantee it here.
429 guarantee0(!os::is_primordial_thread());
430
431 // Query pthread stack page size. Should be the same as data page size because
432 // pthread stacks are allocated from C-Heap.
433 {
434 int dummy = 0;
435 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
436 }
437
438 // Query default text page size (LDR_CNTRL TEXTPSIZE).
439 {
440 address any_function =
441 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
442 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
443 }
444
445 // Now probe for support of 64K pages and 16M pages.
446
447 // Before OS/400 V6R1, there is no support for pages other than 4K.
448 if (os::Aix::on_pase_V5R4_or_older()) {
449 trcVerbose("OS/400 < V6R1 - no large page support.");
450 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
451 goto query_multipage_support_end;
452 }
453
454 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
455 {
456 const int MAX_PAGE_SIZES = 4;
457 psize_t sizes[MAX_PAGE_SIZES];
458 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
459 if (num_psizes == -1) {
460 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
461 trcVerbose("disabling multipage support.");
462 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
463 goto query_multipage_support_end;
464 }
465 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
466 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
467 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
468 for (int i = 0; i < num_psizes; i ++) {
469 trcVerbose(" %s ", describe_pagesize(sizes[i]));
470 }
471
472 // Can we use 64K, 16M pages?
473 for (int i = 0; i < num_psizes; i ++) {
474 const size_t pagesize = sizes[i];
475 if (pagesize != 64*K && pagesize != 16*M) {
476 continue;
477 }
478 bool can_use = false;
479 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
480 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
481 IPC_CREAT | S_IRUSR | S_IWUSR);
482 guarantee0(shmid != -1); // Should always work.
483 // Try to set pagesize.
484 struct shmid_ds shm_buf = { 0 };
485 shm_buf.shm_pagesize = pagesize;
486 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
487 const int en = errno;
488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
489 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
490 errno);
491 } else {
492 // Attach and double check pageisze.
493 void* p = ::shmat(shmid, NULL, 0);
494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
495 guarantee0(p != (void*) -1); // Should always work.
496 const size_t real_pagesize = os::Aix::query_pagesize(p);
497 if (real_pagesize != pagesize) {
498 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
499 } else {
500 can_use = true;
501 }
502 ::shmdt(p);
503 }
504 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
505 if (pagesize == 64*K) {
506 g_multipage_support.can_use_64K_pages = can_use;
507 } else if (pagesize == 16*M) {
508 g_multipage_support.can_use_16M_pages = can_use;
509 }
510 }
511
512 } // end: check which pages can be used for shared memory
513
514 query_multipage_support_end:
515
516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
517 describe_pagesize(g_multipage_support.pagesize));
518 trcVerbose("Data page size (C-Heap, bss, etc): %s",
519 describe_pagesize(g_multipage_support.datapsize));
520 trcVerbose("Text page size: %s",
521 describe_pagesize(g_multipage_support.textpsize));
522 trcVerbose("Thread stack page size (pthread): %s",
523 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
524 trcVerbose("Default shared memory page size: %s",
525 describe_pagesize(g_multipage_support.shmpsize));
526 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
527 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
528 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
529 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
530 trcVerbose("Multipage error details: %d",
531 g_multipage_support.error);
532
533 // sanity checks
534 assert0(g_multipage_support.pagesize == 4*K);
535 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
536 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
537 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
538 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
539
540 }
541
542 void os::init_system_properties_values() {
543
544 #ifndef OVERRIDE_LIBPATH
545 #define DEFAULT_LIBPATH "/lib:/usr/lib"
546 #else
547 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
548 #endif
549 #define EXTENSIONS_DIR "/lib/ext"
550
551 // Buffer that fits several sprintfs.
552 // Note that the space for the trailing null is provided
553 // by the nulls included by the sizeof operator.
554 const size_t bufsize =
555 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
556 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
557 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
558
559 // sysclasspath, java_home, dll_dir
560 {
561 char *pslash;
562 os::jvm_path(buf, bufsize);
563
564 // Found the full path to libjvm.so.
565 // Now cut the path to <java_home>/jre if we can.
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /libjvm.so.
569 }
570 pslash = strrchr(buf, '/');
571 if (pslash != NULL) {
572 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
573 }
574 Arguments::set_dll_dir(buf);
575
576 if (pslash != NULL) {
577 pslash = strrchr(buf, '/');
578 if (pslash != NULL) {
579 *pslash = '\0'; // Get rid of /lib.
580 }
581 }
582 Arguments::set_java_home(buf);
583 if (!set_boot_path('/', ':')) {
584 vm_exit_during_initialization("Failed setting boot class path.", NULL);
585 }
586 }
587
588 // Where to look for native libraries.
589
590 // On Aix we get the user setting of LIBPATH.
591 // Eventually, all the library path setting will be done here.
592 // Get the user setting of LIBPATH.
593 const char *v = ::getenv("LIBPATH");
594 const char *v_colon = ":";
595 if (v == NULL) { v = ""; v_colon = ""; }
596
597 // Concatenate user and invariant part of ld_library_path.
598 // That's +1 for the colon and +1 for the trailing '\0'.
599 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
600 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
601 Arguments::set_library_path(ld_library_path);
602 FREE_C_HEAP_ARRAY(char, ld_library_path);
603
604 // Extensions directories.
605 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
606 Arguments::set_ext_dirs(buf);
607
608 FREE_C_HEAP_ARRAY(char, buf);
609
610 #undef DEFAULT_LIBPATH
611 #undef EXTENSIONS_DIR
612 }
613
614 ////////////////////////////////////////////////////////////////////////////////
615 // breakpoint support
616
617 void os::breakpoint() {
618 BREAKPOINT;
619 }
620
621 extern "C" void breakpoint() {
622 // use debugger to set breakpoint here
623 }
624
625 ////////////////////////////////////////////////////////////////////////////////
626 // signal support
627
628 debug_only(static bool signal_sets_initialized = false);
629 static sigset_t unblocked_sigs, vm_sigs;
630
631 void os::Aix::signal_sets_init() {
632 // Should also have an assertion stating we are still single-threaded.
633 assert(!signal_sets_initialized, "Already initialized");
634 // Fill in signals that are necessarily unblocked for all threads in
635 // the VM. Currently, we unblock the following signals:
636 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
637 // by -Xrs (=ReduceSignalUsage));
638 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
639 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
640 // the dispositions or masks wrt these signals.
641 // Programs embedding the VM that want to use the above signals for their
642 // own purposes must, at this time, use the "-Xrs" option to prevent
643 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
644 // (See bug 4345157, and other related bugs).
645 // In reality, though, unblocking these signals is really a nop, since
646 // these signals are not blocked by default.
647 sigemptyset(&unblocked_sigs);
648 sigaddset(&unblocked_sigs, SIGILL);
649 sigaddset(&unblocked_sigs, SIGSEGV);
650 sigaddset(&unblocked_sigs, SIGBUS);
651 sigaddset(&unblocked_sigs, SIGFPE);
652 sigaddset(&unblocked_sigs, SIGTRAP);
653 sigaddset(&unblocked_sigs, SR_signum);
654
655 if (!ReduceSignalUsage) {
656 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
657 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
658 }
659 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
660 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
661 }
662 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
663 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
664 }
665 }
666 // Fill in signals that are blocked by all but the VM thread.
667 sigemptyset(&vm_sigs);
668 if (!ReduceSignalUsage)
669 sigaddset(&vm_sigs, BREAK_SIGNAL);
670 debug_only(signal_sets_initialized = true);
671 }
672
673 // These are signals that are unblocked while a thread is running Java.
674 // (For some reason, they get blocked by default.)
675 sigset_t* os::Aix::unblocked_signals() {
676 assert(signal_sets_initialized, "Not initialized");
677 return &unblocked_sigs;
678 }
679
680 // These are the signals that are blocked while a (non-VM) thread is
681 // running Java. Only the VM thread handles these signals.
682 sigset_t* os::Aix::vm_signals() {
683 assert(signal_sets_initialized, "Not initialized");
684 return &vm_sigs;
685 }
686
687 void os::Aix::hotspot_sigmask(Thread* thread) {
688
689 //Save caller's signal mask before setting VM signal mask
690 sigset_t caller_sigmask;
691 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
692
693 OSThread* osthread = thread->osthread();
694 osthread->set_caller_sigmask(caller_sigmask);
695
696 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
697
698 if (!ReduceSignalUsage) {
699 if (thread->is_VM_thread()) {
700 // Only the VM thread handles BREAK_SIGNAL ...
701 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
702 } else {
703 // ... all other threads block BREAK_SIGNAL
704 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
705 }
706 }
707 }
708
709 // retrieve memory information.
710 // Returns false if something went wrong;
711 // content of pmi undefined in this case.
712 bool os::Aix::get_meminfo(meminfo_t* pmi) {
713
714 assert(pmi, "get_meminfo: invalid parameter");
715
716 memset(pmi, 0, sizeof(meminfo_t));
717
718 if (os::Aix::on_pase()) {
719 // On PASE, use the libo4 porting library.
720
721 unsigned long long virt_total = 0;
722 unsigned long long real_total = 0;
723 unsigned long long real_free = 0;
724 unsigned long long pgsp_total = 0;
725 unsigned long long pgsp_free = 0;
726 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
727 pmi->virt_total = virt_total;
728 pmi->real_total = real_total;
729 pmi->real_free = real_free;
730 pmi->pgsp_total = pgsp_total;
731 pmi->pgsp_free = pgsp_free;
732 return true;
733 }
734 return false;
735
736 } else {
737
738 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
739 // See:
740 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
741 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
742 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
743 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
744
745 perfstat_memory_total_t psmt;
746 memset (&psmt, '\0', sizeof(psmt));
747 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
748 if (rc == -1) {
749 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
750 assert(0, "perfstat_memory_total() failed");
751 return false;
752 }
753
754 assert(rc == 1, "perfstat_memory_total() - weird return code");
755
756 // excerpt from
757 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
758 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
759 // The fields of perfstat_memory_total_t:
760 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
761 // u_longlong_t real_total Total real memory (in 4 KB pages).
762 // u_longlong_t real_free Free real memory (in 4 KB pages).
763 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
764 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
765
766 pmi->virt_total = psmt.virt_total * 4096;
767 pmi->real_total = psmt.real_total * 4096;
768 pmi->real_free = psmt.real_free * 4096;
769 pmi->pgsp_total = psmt.pgsp_total * 4096;
770 pmi->pgsp_free = psmt.pgsp_free * 4096;
771
772 return true;
773
774 }
775 } // end os::Aix::get_meminfo
776
777 //////////////////////////////////////////////////////////////////////////////
778 // create new thread
779
780 // Thread start routine for all newly created threads
781 static void *thread_native_entry(Thread *thread) {
782
783 thread->record_stack_base_and_size();
784
785 const pthread_t pthread_id = ::pthread_self();
786 const tid_t kernel_thread_id = ::thread_self();
787
788 LogTarget(Info, os, thread) lt;
789 if (lt.is_enabled()) {
790 address low_address = thread->stack_end();
791 address high_address = thread->stack_base();
792 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
793 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
794 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
795 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
796 }
797
798 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
799 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
800 // tools hook pthread_create(). In this case, we may run into problems establishing
801 // guard pages on those stacks, because the stacks may reside in memory which is not
802 // protectable (shmated).
803 if (thread->stack_base() > ::sbrk(0)) {
804 log_warning(os, thread)("Thread stack not in data segment.");
805 }
806
807 // Try to randomize the cache line index of hot stack frames.
808 // This helps when threads of the same stack traces evict each other's
809 // cache lines. The threads can be either from the same JVM instance, or
810 // from different JVM instances. The benefit is especially true for
811 // processors with hyperthreading technology.
812
813 static int counter = 0;
814 int pid = os::current_process_id();
815 alloca(((pid ^ counter++) & 7) * 128);
816
817 thread->initialize_thread_current();
818
819 OSThread* osthread = thread->osthread();
820
821 // Thread_id is pthread id.
822 osthread->set_thread_id(pthread_id);
823
824 // .. but keep kernel thread id too for diagnostics
825 osthread->set_kernel_thread_id(kernel_thread_id);
826
827 // Initialize signal mask for this thread.
828 os::Aix::hotspot_sigmask(thread);
829
830 // Initialize floating point control register.
831 os::Aix::init_thread_fpu_state();
832
833 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
834
835 // Call one more level start routine.
836 thread->call_run();
837
838 // Note: at this point the thread object may already have deleted itself.
839 // Prevent dereferencing it from here on out.
840 thread = NULL;
841
842 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
843 os::current_thread_id(), (uintx) kernel_thread_id);
844
845 return 0;
846 }
847
848 bool os::create_thread(Thread* thread, ThreadType thr_type,
849 size_t req_stack_size) {
850
851 assert(thread->osthread() == NULL, "caller responsible");
852
853 // Allocate the OSThread object.
854 OSThread* osthread = new OSThread(NULL, NULL);
855 if (osthread == NULL) {
856 return false;
857 }
858
859 // Set the correct thread state.
860 osthread->set_thread_type(thr_type);
861
862 // Initial state is ALLOCATED but not INITIALIZED
863 osthread->set_state(ALLOCATED);
864
865 thread->set_osthread(osthread);
866
867 // Init thread attributes.
868 pthread_attr_t attr;
869 pthread_attr_init(&attr);
870 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
871
872 // Make sure we run in 1:1 kernel-user-thread mode.
873 if (os::Aix::on_aix()) {
874 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
875 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
876 }
877
878 // Start in suspended state, and in os::thread_start, wake the thread up.
879 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
880
881 // Calculate stack size if it's not specified by caller.
882 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
883
884 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
885 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
886 // This very much looks like a pthread lib error. As a workaround, increase the stack size
887 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
888 if (stack_size < 4096 * K) {
889 stack_size += 64 * K;
890 }
891
892 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
893 // thread size in attr unchanged. If this is the minimal stack size as set
894 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
895 // guard pages might not fit on the tiny stack created.
896 int ret = pthread_attr_setstacksize(&attr, stack_size);
897 if (ret != 0) {
898 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
899 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
900 stack_size / K);
901 thread->set_osthread(NULL);
902 delete osthread;
903 return false;
904 }
905
906 // Save some cycles and a page by disabling OS guard pages where we have our own
907 // VM guard pages (in java threads). For other threads, keep system default guard
908 // pages in place.
909 if (thr_type == java_thread || thr_type == compiler_thread) {
910 ret = pthread_attr_setguardsize(&attr, 0);
911 }
912
913 pthread_t tid = 0;
914 if (ret == 0) {
915 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
916 }
917
918 if (ret == 0) {
919 char buf[64];
920 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
921 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
922 } else {
923 char buf[64];
924 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
925 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
926 }
927
928 pthread_attr_destroy(&attr);
929
930 if (ret != 0) {
931 // Need to clean up stuff we've allocated so far.
932 thread->set_osthread(NULL);
933 delete osthread;
934 return false;
935 }
936
937 // OSThread::thread_id is the pthread id.
938 osthread->set_thread_id(tid);
939
940 return true;
941 }
942
943 /////////////////////////////////////////////////////////////////////////////
944 // attach existing thread
945
946 // bootstrap the main thread
947 bool os::create_main_thread(JavaThread* thread) {
948 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
949 return create_attached_thread(thread);
950 }
951
952 bool os::create_attached_thread(JavaThread* thread) {
953 #ifdef ASSERT
954 thread->verify_not_published();
955 #endif
956
957 // Allocate the OSThread object
958 OSThread* osthread = new OSThread(NULL, NULL);
959
960 if (osthread == NULL) {
961 return false;
962 }
963
964 const pthread_t pthread_id = ::pthread_self();
965 const tid_t kernel_thread_id = ::thread_self();
966
967 // OSThread::thread_id is the pthread id.
968 osthread->set_thread_id(pthread_id);
969
970 // .. but keep kernel thread id too for diagnostics
971 osthread->set_kernel_thread_id(kernel_thread_id);
972
973 // initialize floating point control register
974 os::Aix::init_thread_fpu_state();
975
976 // Initial thread state is RUNNABLE
977 osthread->set_state(RUNNABLE);
978
979 thread->set_osthread(osthread);
980
981 if (UseNUMA) {
982 int lgrp_id = os::numa_get_group_id();
983 if (lgrp_id != -1) {
984 thread->set_lgrp_id(lgrp_id);
985 }
986 }
987
988 // initialize signal mask for this thread
989 // and save the caller's signal mask
990 os::Aix::hotspot_sigmask(thread);
991
992 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
993 os::current_thread_id(), (uintx) kernel_thread_id);
994
995 return true;
996 }
997
998 void os::pd_start_thread(Thread* thread) {
999 int status = pthread_continue_np(thread->osthread()->pthread_id());
1000 assert(status == 0, "thr_continue failed");
1001 }
1002
1003 // Free OS resources related to the OSThread
1004 void os::free_thread(OSThread* osthread) {
1005 assert(osthread != NULL, "osthread not set");
1006
1007 // We are told to free resources of the argument thread,
1008 // but we can only really operate on the current thread.
1009 assert(Thread::current()->osthread() == osthread,
1010 "os::free_thread but not current thread");
1011
1012 // Restore caller's signal mask
1013 sigset_t sigmask = osthread->caller_sigmask();
1014 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1015
1016 delete osthread;
1017 }
1018
1019 ////////////////////////////////////////////////////////////////////////////////
1020 // time support
1021
1022 // Time since start-up in seconds to a fine granularity.
1023 // Used by VMSelfDestructTimer and the MemProfiler.
1024 double os::elapsedTime() {
1025 return (double)(os::elapsed_counter()) * 0.000001;
1026 }
1027
1028 jlong os::elapsed_counter() {
1029 timeval time;
1030 int status = gettimeofday(&time, NULL);
1031 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1032 }
1033
1034 jlong os::elapsed_frequency() {
1035 return (1000 * 1000);
1036 }
1037
1038 bool os::supports_vtime() { return true; }
1039 bool os::enable_vtime() { return false; }
1040 bool os::vtime_enabled() { return false; }
1041
1042 double os::elapsedVTime() {
1043 struct rusage usage;
1044 int retval = getrusage(RUSAGE_THREAD, &usage);
1045 if (retval == 0) {
1046 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1047 } else {
1048 // better than nothing, but not much
1049 return elapsedTime();
1050 }
1051 }
1052
1053 jlong os::javaTimeMillis() {
1054 timeval time;
1055 int status = gettimeofday(&time, NULL);
1056 assert(status != -1, "aix error at gettimeofday()");
1057 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1058 }
1059
1060 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1061 timeval time;
1062 int status = gettimeofday(&time, NULL);
1063 assert(status != -1, "aix error at gettimeofday()");
1064 seconds = jlong(time.tv_sec);
1065 nanos = jlong(time.tv_usec) * 1000;
1066 }
1067
1068 // We use mread_real_time here.
1069 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1070 // it has to be converted to real time. AIX documentations suggests to do
1071 // this unconditionally, so we do it.
1072 //
1073 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1074 //
1075 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1076 // conversion is necessary. However, mread_real_time will not return
1077 // monotonic results but merely matches read_real_time. So we need a tweak
1078 // to ensure monotonic results.
1079 //
1080 // For PASE no public documentation exists, just word by IBM
1081 jlong os::javaTimeNanos() {
1082 timebasestruct_t time;
1083 int rc = mread_real_time(&time, TIMEBASE_SZ);
1084 if (os::Aix::on_pase()) {
1085 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1086 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1087 jlong prev = max_real_time;
1088 if (now <= prev) {
1089 return prev; // same or retrograde time;
1090 }
1091 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1092 assert(obsv >= prev, "invariant"); // Monotonicity
1093 // If the CAS succeeded then we're done and return "now".
1094 // If the CAS failed and the observed value "obsv" is >= now then
1095 // we should return "obsv". If the CAS failed and now > obsv > prv then
1096 // some other thread raced this thread and installed a new value, in which case
1097 // we could either (a) retry the entire operation, (b) retry trying to install now
1098 // or (c) just return obsv. We use (c). No loop is required although in some cases
1099 // we might discard a higher "now" value in deference to a slightly lower but freshly
1100 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1101 // to (a) or (b) -- and greatly reduces coherence traffic.
1102 // We might also condition (c) on the magnitude of the delta between obsv and now.
1103 // Avoiding excessive CAS operations to hot RW locations is critical.
1104 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1105 return (prev == obsv) ? now : obsv;
1106 } else {
1107 if (rc != RTC_POWER) {
1108 rc = time_base_to_time(&time, TIMEBASE_SZ);
1109 assert(rc != -1, "error calling time_base_to_time()");
1110 }
1111 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1112 }
1113 }
1114
1115 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1116 info_ptr->max_value = ALL_64_BITS;
1117 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1118 info_ptr->may_skip_backward = false;
1119 info_ptr->may_skip_forward = false;
1120 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1121 }
1122
1123 // Return the real, user, and system times in seconds from an
1124 // arbitrary fixed point in the past.
1125 bool os::getTimesSecs(double* process_real_time,
1126 double* process_user_time,
1127 double* process_system_time) {
1128 struct tms ticks;
1129 clock_t real_ticks = times(&ticks);
1130
1131 if (real_ticks == (clock_t) (-1)) {
1132 return false;
1133 } else {
1134 double ticks_per_second = (double) clock_tics_per_sec;
1135 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1136 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1137 *process_real_time = ((double) real_ticks) / ticks_per_second;
1138
1139 return true;
1140 }
1141 }
1142
1143 char * os::local_time_string(char *buf, size_t buflen) {
1144 struct tm t;
1145 time_t long_time;
1146 time(&long_time);
1147 localtime_r(&long_time, &t);
1148 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1149 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1150 t.tm_hour, t.tm_min, t.tm_sec);
1151 return buf;
1152 }
1153
1154 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1155 return localtime_r(clock, res);
1156 }
1157
1158 ////////////////////////////////////////////////////////////////////////////////
1159 // runtime exit support
1160
1161 // Note: os::shutdown() might be called very early during initialization, or
1162 // called from signal handler. Before adding something to os::shutdown(), make
1163 // sure it is async-safe and can handle partially initialized VM.
1164 void os::shutdown() {
1165
1166 // allow PerfMemory to attempt cleanup of any persistent resources
1167 perfMemory_exit();
1168
1169 // needs to remove object in file system
1170 AttachListener::abort();
1171
1172 // flush buffered output, finish log files
1173 ostream_abort();
1174
1175 // Check for abort hook
1176 abort_hook_t abort_hook = Arguments::abort_hook();
1177 if (abort_hook != NULL) {
1178 abort_hook();
1179 }
1180 }
1181
1182 // Note: os::abort() might be called very early during initialization, or
1183 // called from signal handler. Before adding something to os::abort(), make
1184 // sure it is async-safe and can handle partially initialized VM.
1185 void os::abort(bool dump_core, void* siginfo, const void* context) {
1186 os::shutdown();
1187 if (dump_core) {
1188 #ifndef PRODUCT
1189 fdStream out(defaultStream::output_fd());
1190 out.print_raw("Current thread is ");
1191 char buf[16];
1192 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1193 out.print_raw_cr(buf);
1194 out.print_raw_cr("Dumping core ...");
1195 #endif
1196 ::abort(); // dump core
1197 }
1198
1199 ::exit(1);
1200 }
1201
1202 // Die immediately, no exit hook, no abort hook, no cleanup.
1203 void os::die() {
1204 ::abort();
1205 }
1206
1207 intx os::current_thread_id() {
1208 return (intx)pthread_self();
1209 }
1210
1211 int os::current_process_id() {
1212 return getpid();
1213 }
1214
1215 // DLL functions
1216
1217 const char* os::dll_file_extension() { return ".so"; }
1218
1219 // This must be hard coded because it's the system's temporary
1220 // directory not the java application's temp directory, ala java.io.tmpdir.
1221 const char* os::get_temp_directory() { return "/tmp"; }
1222
1223 // Check if addr is inside libjvm.so.
1224 bool os::address_is_in_vm(address addr) {
1225
1226 // Input could be a real pc or a function pointer literal. The latter
1227 // would be a function descriptor residing in the data segment of a module.
1228 loaded_module_t lm;
1229 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1230 return lm.is_in_vm;
1231 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1232 return lm.is_in_vm;
1233 } else {
1234 return false;
1235 }
1236
1237 }
1238
1239 // Resolve an AIX function descriptor literal to a code pointer.
1240 // If the input is a valid code pointer to a text segment of a loaded module,
1241 // it is returned unchanged.
1242 // If the input is a valid AIX function descriptor, it is resolved to the
1243 // code entry point.
1244 // If the input is neither a valid function descriptor nor a valid code pointer,
1245 // NULL is returned.
1246 static address resolve_function_descriptor_to_code_pointer(address p) {
1247
1248 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1249 // It is a real code pointer.
1250 return p;
1251 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1252 // Pointer to data segment, potential function descriptor.
1253 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1254 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1255 // It is a function descriptor.
1256 return code_entry;
1257 }
1258 }
1259
1260 return NULL;
1261 }
1262
1263 bool os::dll_address_to_function_name(address addr, char *buf,
1264 int buflen, int *offset,
1265 bool demangle) {
1266 if (offset) {
1267 *offset = -1;
1268 }
1269 // Buf is not optional, but offset is optional.
1270 assert(buf != NULL, "sanity check");
1271 buf[0] = '\0';
1272
1273 // Resolve function ptr literals first.
1274 addr = resolve_function_descriptor_to_code_pointer(addr);
1275 if (!addr) {
1276 return false;
1277 }
1278
1279 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1280 }
1281
1282 bool os::dll_address_to_library_name(address addr, char* buf,
1283 int buflen, int* offset) {
1284 if (offset) {
1285 *offset = -1;
1286 }
1287 // Buf is not optional, but offset is optional.
1288 assert(buf != NULL, "sanity check");
1289 buf[0] = '\0';
1290
1291 // Resolve function ptr literals first.
1292 addr = resolve_function_descriptor_to_code_pointer(addr);
1293 if (!addr) {
1294 return false;
1295 }
1296
1297 return AixSymbols::get_module_name(addr, buf, buflen);
1298 }
1299
1300 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1301 // for the same architecture as Hotspot is running on.
1302 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1303
1304 if (ebuf && ebuflen > 0) {
1305 ebuf[0] = '\0';
1306 ebuf[ebuflen - 1] = '\0';
1307 }
1308
1309 if (!filename || strlen(filename) == 0) {
1310 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1311 return NULL;
1312 }
1313
1314 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1315 void * result= ::dlopen(filename, RTLD_LAZY);
1316 if (result != NULL) {
1317 // Reload dll cache. Don't do this in signal handling.
1318 LoadedLibraries::reload();
1319 return result;
1320 } else {
1321 // error analysis when dlopen fails
1322 const char* const error_report = ::dlerror();
1323 if (error_report && ebuf && ebuflen > 0) {
1324 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1325 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1326 }
1327 }
1328 return NULL;
1329 }
1330
1331 void* os::dll_lookup(void* handle, const char* name) {
1332 void* res = dlsym(handle, name);
1333 return res;
1334 }
1335
1336 void* os::get_default_process_handle() {
1337 return (void*)::dlopen(NULL, RTLD_LAZY);
1338 }
1339
1340 void os::print_dll_info(outputStream *st) {
1341 st->print_cr("Dynamic libraries:");
1342 LoadedLibraries::print(st);
1343 }
1344
1345 void os::get_summary_os_info(char* buf, size_t buflen) {
1346 // There might be something more readable than uname results for AIX.
1347 struct utsname name;
1348 uname(&name);
1349 snprintf(buf, buflen, "%s %s", name.release, name.version);
1350 }
1351
1352 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1353 // Not yet implemented.
1354 return 0;
1355 }
1356
1357 void os::print_os_info_brief(outputStream* st) {
1358 uint32_t ver = os::Aix::os_version();
1359 st->print_cr("AIX kernel version %u.%u.%u.%u",
1360 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1361
1362 os::Posix::print_uname_info(st);
1363
1364 // Linux uses print_libversion_info(st); here.
1365 }
1366
1367 void os::print_os_info(outputStream* st) {
1368 st->print("OS:");
1369
1370 st->print("uname:");
1371 struct utsname name;
1372 uname(&name);
1373 st->print(name.sysname); st->print(" ");
1374 st->print(name.nodename); st->print(" ");
1375 st->print(name.release); st->print(" ");
1376 st->print(name.version); st->print(" ");
1377 st->print(name.machine);
1378 st->cr();
1379
1380 uint32_t ver = os::Aix::os_version();
1381 st->print_cr("AIX kernel version %u.%u.%u.%u",
1382 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1383
1384 os::Posix::print_rlimit_info(st);
1385
1386 // load average
1387 st->print("load average:");
1388 double loadavg[3] = {-1.L, -1.L, -1.L};
1389 os::loadavg(loadavg, 3);
1390 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1391 st->cr();
1392
1393 // print wpar info
1394 libperfstat::wparinfo_t wi;
1395 if (libperfstat::get_wparinfo(&wi)) {
1396 st->print_cr("wpar info");
1397 st->print_cr("name: %s", wi.name);
1398 st->print_cr("id: %d", wi.wpar_id);
1399 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1400 }
1401
1402 // print partition info
1403 libperfstat::partitioninfo_t pi;
1404 if (libperfstat::get_partitioninfo(&pi)) {
1405 st->print_cr("partition info");
1406 st->print_cr(" name: %s", pi.name);
1407 }
1408
1409 }
1410
1411 void os::print_memory_info(outputStream* st) {
1412
1413 st->print_cr("Memory:");
1414
1415 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1416 describe_pagesize(g_multipage_support.pagesize));
1417 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1418 describe_pagesize(g_multipage_support.datapsize));
1419 st->print_cr(" Text page size: %s",
1420 describe_pagesize(g_multipage_support.textpsize));
1421 st->print_cr(" Thread stack page size (pthread): %s",
1422 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1423 st->print_cr(" Default shared memory page size: %s",
1424 describe_pagesize(g_multipage_support.shmpsize));
1425 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1426 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1427 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1428 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1429 st->print_cr(" Multipage error: %d",
1430 g_multipage_support.error);
1431 st->cr();
1432 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1433
1434 // print out LDR_CNTRL because it affects the default page sizes
1435 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1436 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1437
1438 // Print out EXTSHM because it is an unsupported setting.
1439 const char* const extshm = ::getenv("EXTSHM");
1440 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1441 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1442 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1443 }
1444
1445 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1446 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1447 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1448 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1449 st->cr();
1450
1451 os::Aix::meminfo_t mi;
1452 if (os::Aix::get_meminfo(&mi)) {
1453 if (os::Aix::on_aix()) {
1454 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1455 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1456 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1457 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1458 } else {
1459 // PASE - Numbers are result of QWCRSSTS; they mean:
1460 // real_total: Sum of all system pools
1461 // real_free: always 0
1462 // pgsp_total: we take the size of the system ASP
1463 // pgsp_free: size of system ASP times percentage of system ASP unused
1464 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1465 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1466 st->print_cr("%% system asp used : %.2f",
1467 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1468 }
1469 }
1470 st->cr();
1471
1472 // Print program break.
1473 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1474 address brk_now = (address)::sbrk(0);
1475 if (brk_now != (address)-1) {
1476 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1477 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1478 }
1479 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1480 st->cr();
1481
1482 // Print segments allocated with os::reserve_memory.
1483 st->print_cr("internal virtual memory regions used by vm:");
1484 vmembk_print_on(st);
1485 }
1486
1487 // Get a string for the cpuinfo that is a summary of the cpu type
1488 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1489 // read _system_configuration.version
1490 switch (_system_configuration.version) {
1491 case PV_8:
1492 strncpy(buf, "Power PC 8", buflen);
1493 break;
1494 case PV_7:
1495 strncpy(buf, "Power PC 7", buflen);
1496 break;
1497 case PV_6_1:
1498 strncpy(buf, "Power PC 6 DD1.x", buflen);
1499 break;
1500 case PV_6:
1501 strncpy(buf, "Power PC 6", buflen);
1502 break;
1503 case PV_5:
1504 strncpy(buf, "Power PC 5", buflen);
1505 break;
1506 case PV_5_2:
1507 strncpy(buf, "Power PC 5_2", buflen);
1508 break;
1509 case PV_5_3:
1510 strncpy(buf, "Power PC 5_3", buflen);
1511 break;
1512 case PV_5_Compat:
1513 strncpy(buf, "PV_5_Compat", buflen);
1514 break;
1515 case PV_6_Compat:
1516 strncpy(buf, "PV_6_Compat", buflen);
1517 break;
1518 case PV_7_Compat:
1519 strncpy(buf, "PV_7_Compat", buflen);
1520 break;
1521 case PV_8_Compat:
1522 strncpy(buf, "PV_8_Compat", buflen);
1523 break;
1524 default:
1525 strncpy(buf, "unknown", buflen);
1526 }
1527 }
1528
1529 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1530 // Nothing to do beyond of what os::print_cpu_info() does.
1531 }
1532
1533 static void print_signal_handler(outputStream* st, int sig,
1534 char* buf, size_t buflen);
1535
1536 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1537 st->print_cr("Signal Handlers:");
1538 print_signal_handler(st, SIGSEGV, buf, buflen);
1539 print_signal_handler(st, SIGBUS , buf, buflen);
1540 print_signal_handler(st, SIGFPE , buf, buflen);
1541 print_signal_handler(st, SIGPIPE, buf, buflen);
1542 print_signal_handler(st, SIGXFSZ, buf, buflen);
1543 print_signal_handler(st, SIGILL , buf, buflen);
1544 print_signal_handler(st, SR_signum, buf, buflen);
1545 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1546 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1547 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1548 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1549 print_signal_handler(st, SIGTRAP, buf, buflen);
1550 // We also want to know if someone else adds a SIGDANGER handler because
1551 // that will interfere with OOM killling.
1552 print_signal_handler(st, SIGDANGER, buf, buflen);
1553 }
1554
1555 static char saved_jvm_path[MAXPATHLEN] = {0};
1556
1557 // Find the full path to the current module, libjvm.so.
1558 void os::jvm_path(char *buf, jint buflen) {
1559 // Error checking.
1560 if (buflen < MAXPATHLEN) {
1561 assert(false, "must use a large-enough buffer");
1562 buf[0] = '\0';
1563 return;
1564 }
1565 // Lazy resolve the path to current module.
1566 if (saved_jvm_path[0] != 0) {
1567 strcpy(buf, saved_jvm_path);
1568 return;
1569 }
1570
1571 Dl_info dlinfo;
1572 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1573 assert(ret != 0, "cannot locate libjvm");
1574 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1575 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1576
1577 if (Arguments::sun_java_launcher_is_altjvm()) {
1578 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1579 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1580 // If "/jre/lib/" appears at the right place in the string, then
1581 // assume we are installed in a JDK and we're done. Otherwise, check
1582 // for a JAVA_HOME environment variable and fix up the path so it
1583 // looks like libjvm.so is installed there (append a fake suffix
1584 // hotspot/libjvm.so).
1585 const char *p = buf + strlen(buf) - 1;
1586 for (int count = 0; p > buf && count < 4; ++count) {
1587 for (--p; p > buf && *p != '/'; --p)
1588 /* empty */ ;
1589 }
1590
1591 if (strncmp(p, "/jre/lib/", 9) != 0) {
1592 // Look for JAVA_HOME in the environment.
1593 char* java_home_var = ::getenv("JAVA_HOME");
1594 if (java_home_var != NULL && java_home_var[0] != 0) {
1595 char* jrelib_p;
1596 int len;
1597
1598 // Check the current module name "libjvm.so".
1599 p = strrchr(buf, '/');
1600 if (p == NULL) {
1601 return;
1602 }
1603 assert(strstr(p, "/libjvm") == p, "invalid library name");
1604
1605 rp = os::Posix::realpath(java_home_var, buf, buflen);
1606 if (rp == NULL) {
1607 return;
1608 }
1609
1610 // determine if this is a legacy image or modules image
1611 // modules image doesn't have "jre" subdirectory
1612 len = strlen(buf);
1613 assert(len < buflen, "Ran out of buffer room");
1614 jrelib_p = buf + len;
1615 snprintf(jrelib_p, buflen-len, "/jre/lib");
1616 if (0 != access(buf, F_OK)) {
1617 snprintf(jrelib_p, buflen-len, "/lib");
1618 }
1619
1620 if (0 == access(buf, F_OK)) {
1621 // Use current module name "libjvm.so"
1622 len = strlen(buf);
1623 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1624 } else {
1625 // Go back to path of .so
1626 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1627 if (rp == NULL) {
1628 return;
1629 }
1630 }
1631 }
1632 }
1633 }
1634
1635 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1636 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1637 }
1638
1639 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1640 // no prefix required, not even "_"
1641 }
1642
1643 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1644 // no suffix required
1645 }
1646
1647 ////////////////////////////////////////////////////////////////////////////////
1648 // sun.misc.Signal support
1649
1650 static volatile jint sigint_count = 0;
1651
1652 static void
1653 UserHandler(int sig, void *siginfo, void *context) {
1654 // 4511530 - sem_post is serialized and handled by the manager thread. When
1655 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1656 // don't want to flood the manager thread with sem_post requests.
1657 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1658 return;
1659
1660 // Ctrl-C is pressed during error reporting, likely because the error
1661 // handler fails to abort. Let VM die immediately.
1662 if (sig == SIGINT && VMError::is_error_reported()) {
1663 os::die();
1664 }
1665
1666 os::signal_notify(sig);
1667 }
1668
1669 void* os::user_handler() {
1670 return CAST_FROM_FN_PTR(void*, UserHandler);
1671 }
1672
1673 extern "C" {
1674 typedef void (*sa_handler_t)(int);
1675 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1676 }
1677
1678 void* os::signal(int signal_number, void* handler) {
1679 struct sigaction sigAct, oldSigAct;
1680
1681 sigfillset(&(sigAct.sa_mask));
1682
1683 // Do not block out synchronous signals in the signal handler.
1684 // Blocking synchronous signals only makes sense if you can really
1685 // be sure that those signals won't happen during signal handling,
1686 // when the blocking applies. Normal signal handlers are lean and
1687 // do not cause signals. But our signal handlers tend to be "risky"
1688 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1689 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1690 // by a SIGILL, which was blocked due to the signal mask. The process
1691 // just hung forever. Better to crash from a secondary signal than to hang.
1692 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1693 sigdelset(&(sigAct.sa_mask), SIGBUS);
1694 sigdelset(&(sigAct.sa_mask), SIGILL);
1695 sigdelset(&(sigAct.sa_mask), SIGFPE);
1696 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1697
1698 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1699
1700 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1701
1702 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1703 // -1 means registration failed
1704 return (void *)-1;
1705 }
1706
1707 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1708 }
1709
1710 void os::signal_raise(int signal_number) {
1711 ::raise(signal_number);
1712 }
1713
1714 //
1715 // The following code is moved from os.cpp for making this
1716 // code platform specific, which it is by its very nature.
1717 //
1718
1719 // Will be modified when max signal is changed to be dynamic
1720 int os::sigexitnum_pd() {
1721 return NSIG;
1722 }
1723
1724 // a counter for each possible signal value
1725 static volatile jint pending_signals[NSIG+1] = { 0 };
1726
1727 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1728 // On AIX, we use sem_init(), sem_post(), sem_wait()
1729 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1730 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1731 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1732 // on AIX, msem_..() calls are suspected of causing problems.
1733 static sem_t sig_sem;
1734 static msemaphore* p_sig_msem = 0;
1735
1736 static void local_sem_init() {
1737 if (os::Aix::on_aix()) {
1738 int rc = ::sem_init(&sig_sem, 0, 0);
1739 guarantee(rc != -1, "sem_init failed");
1740 } else {
1741 // Memory semaphores must live in shared mem.
1742 guarantee0(p_sig_msem == NULL);
1743 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1744 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1745 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1746 }
1747 }
1748
1749 static void local_sem_post() {
1750 static bool warn_only_once = false;
1751 if (os::Aix::on_aix()) {
1752 int rc = ::sem_post(&sig_sem);
1753 if (rc == -1 && !warn_only_once) {
1754 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1755 warn_only_once = true;
1756 }
1757 } else {
1758 guarantee0(p_sig_msem != NULL);
1759 int rc = ::msem_unlock(p_sig_msem, 0);
1760 if (rc == -1 && !warn_only_once) {
1761 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1762 warn_only_once = true;
1763 }
1764 }
1765 }
1766
1767 static void local_sem_wait() {
1768 static bool warn_only_once = false;
1769 if (os::Aix::on_aix()) {
1770 int rc = ::sem_wait(&sig_sem);
1771 if (rc == -1 && !warn_only_once) {
1772 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1773 warn_only_once = true;
1774 }
1775 } else {
1776 guarantee0(p_sig_msem != NULL); // must init before use
1777 int rc = ::msem_lock(p_sig_msem, 0);
1778 if (rc == -1 && !warn_only_once) {
1779 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1780 warn_only_once = true;
1781 }
1782 }
1783 }
1784
1785 static void jdk_misc_signal_init() {
1786 // Initialize signal structures
1787 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1788
1789 // Initialize signal semaphore
1790 local_sem_init();
1791 }
1792
1793 void os::signal_notify(int sig) {
1794 Atomic::inc(&pending_signals[sig]);
1795 local_sem_post();
1796 }
1797
1798 static int check_pending_signals() {
1799 Atomic::store(0, &sigint_count);
1800 for (;;) {
1801 for (int i = 0; i < NSIG + 1; i++) {
1802 jint n = pending_signals[i];
1803 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1804 return i;
1805 }
1806 }
1807 JavaThread *thread = JavaThread::current();
1808 ThreadBlockInVM tbivm(thread);
1809
1810 bool threadIsSuspended;
1811 do {
1812 thread->set_suspend_equivalent();
1813 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1814
1815 local_sem_wait();
1816
1817 // were we externally suspended while we were waiting?
1818 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1819 if (threadIsSuspended) {
1820 //
1821 // The semaphore has been incremented, but while we were waiting
1822 // another thread suspended us. We don't want to continue running
1823 // while suspended because that would surprise the thread that
1824 // suspended us.
1825 //
1826
1827 local_sem_post();
1828
1829 thread->java_suspend_self();
1830 }
1831 } while (threadIsSuspended);
1832 }
1833 }
1834
1835 int os::signal_wait() {
1836 return check_pending_signals();
1837 }
1838
1839 ////////////////////////////////////////////////////////////////////////////////
1840 // Virtual Memory
1841
1842 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1843
1844 #define VMEM_MAPPED 1
1845 #define VMEM_SHMATED 2
1846
1847 struct vmembk_t {
1848 int type; // 1 - mmap, 2 - shmat
1849 char* addr;
1850 size_t size; // Real size, may be larger than usersize.
1851 size_t pagesize; // page size of area
1852 vmembk_t* next;
1853
1854 bool contains_addr(char* p) const {
1855 return p >= addr && p < (addr + size);
1856 }
1857
1858 bool contains_range(char* p, size_t s) const {
1859 return contains_addr(p) && contains_addr(p + s - 1);
1860 }
1861
1862 void print_on(outputStream* os) const {
1863 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1864 " bytes, %d %s pages), %s",
1865 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1866 (type == VMEM_SHMATED ? "shmat" : "mmap")
1867 );
1868 }
1869
1870 // Check that range is a sub range of memory block (or equal to memory block);
1871 // also check that range is fully page aligned to the page size if the block.
1872 void assert_is_valid_subrange(char* p, size_t s) const {
1873 if (!contains_range(p, s)) {
1874 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1875 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1876 p, p + s, addr, addr + size);
1877 guarantee0(false);
1878 }
1879 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1880 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1881 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1882 guarantee0(false);
1883 }
1884 }
1885 };
1886
1887 static struct {
1888 vmembk_t* first;
1889 MiscUtils::CritSect cs;
1890 } vmem;
1891
1892 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1893 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1894 assert0(p);
1895 if (p) {
1896 MiscUtils::AutoCritSect lck(&vmem.cs);
1897 p->addr = addr; p->size = size;
1898 p->pagesize = pagesize;
1899 p->type = type;
1900 p->next = vmem.first;
1901 vmem.first = p;
1902 }
1903 }
1904
1905 static vmembk_t* vmembk_find(char* addr) {
1906 MiscUtils::AutoCritSect lck(&vmem.cs);
1907 for (vmembk_t* p = vmem.first; p; p = p->next) {
1908 if (p->addr <= addr && (p->addr + p->size) > addr) {
1909 return p;
1910 }
1911 }
1912 return NULL;
1913 }
1914
1915 static void vmembk_remove(vmembk_t* p0) {
1916 MiscUtils::AutoCritSect lck(&vmem.cs);
1917 assert0(p0);
1918 assert0(vmem.first); // List should not be empty.
1919 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1920 if (*pp == p0) {
1921 *pp = p0->next;
1922 ::free(p0);
1923 return;
1924 }
1925 }
1926 assert0(false); // Not found?
1927 }
1928
1929 static void vmembk_print_on(outputStream* os) {
1930 MiscUtils::AutoCritSect lck(&vmem.cs);
1931 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1932 vmi->print_on(os);
1933 os->cr();
1934 }
1935 }
1936
1937 // Reserve and attach a section of System V memory.
1938 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1939 // address. Failing that, it will attach the memory anywhere.
1940 // If <requested_addr> is NULL, function will attach the memory anywhere.
1941 //
1942 // <alignment_hint> is being ignored by this function. It is very probable however that the
1943 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1944 // Should this be not enogh, we can put more work into it.
1945 static char* reserve_shmated_memory (
1946 size_t bytes,
1947 char* requested_addr,
1948 size_t alignment_hint) {
1949
1950 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1951 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1952 bytes, requested_addr, alignment_hint);
1953
1954 // Either give me wish address or wish alignment but not both.
1955 assert0(!(requested_addr != NULL && alignment_hint != 0));
1956
1957 // We must prevent anyone from attaching too close to the
1958 // BRK because that may cause malloc OOM.
1959 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1960 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1961 "Will attach anywhere.", requested_addr);
1962 // Act like the OS refused to attach there.
1963 requested_addr = NULL;
1964 }
1965
1966 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1967 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1968 if (os::Aix::on_pase_V5R4_or_older()) {
1969 ShouldNotReachHere();
1970 }
1971
1972 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1973 const size_t size = align_up(bytes, 64*K);
1974
1975 // Reserve the shared segment.
1976 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1977 if (shmid == -1) {
1978 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1979 return NULL;
1980 }
1981
1982 // Important note:
1983 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1984 // We must right after attaching it remove it from the system. System V shm segments are global and
1985 // survive the process.
1986 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1987
1988 struct shmid_ds shmbuf;
1989 memset(&shmbuf, 0, sizeof(shmbuf));
1990 shmbuf.shm_pagesize = 64*K;
1991 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1992 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1993 size / (64*K), errno);
1994 // I want to know if this ever happens.
1995 assert(false, "failed to set page size for shmat");
1996 }
1997
1998 // Now attach the shared segment.
1999 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2000 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2001 // were not a segment boundary.
2002 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2003 const int errno_shmat = errno;
2004
2005 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2006 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2007 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2008 assert(false, "failed to remove shared memory segment!");
2009 }
2010
2011 // Handle shmat error. If we failed to attach, just return.
2012 if (addr == (char*)-1) {
2013 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2014 return NULL;
2015 }
2016
2017 // Just for info: query the real page size. In case setting the page size did not
2018 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2019 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2020 if (real_pagesize != shmbuf.shm_pagesize) {
2021 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2022 }
2023
2024 if (addr) {
2025 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2026 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2027 } else {
2028 if (requested_addr != NULL) {
2029 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2030 } else {
2031 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2032 }
2033 }
2034
2035 // book-keeping
2036 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2037 assert0(is_aligned_to(addr, os::vm_page_size()));
2038
2039 return addr;
2040 }
2041
2042 static bool release_shmated_memory(char* addr, size_t size) {
2043
2044 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2045 addr, addr + size - 1);
2046
2047 bool rc = false;
2048
2049 // TODO: is there a way to verify shm size without doing bookkeeping?
2050 if (::shmdt(addr) != 0) {
2051 trcVerbose("error (%d).", errno);
2052 } else {
2053 trcVerbose("ok.");
2054 rc = true;
2055 }
2056 return rc;
2057 }
2058
2059 static bool uncommit_shmated_memory(char* addr, size_t size) {
2060 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2061 addr, addr + size - 1);
2062
2063 const bool rc = my_disclaim64(addr, size);
2064
2065 if (!rc) {
2066 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2067 return false;
2068 }
2069 return true;
2070 }
2071
2072 //////////////////////////////// mmap-based routines /////////////////////////////////
2073
2074 // Reserve memory via mmap.
2075 // If <requested_addr> is given, an attempt is made to attach at the given address.
2076 // Failing that, memory is allocated at any address.
2077 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2078 // allocate at an address aligned with the given alignment. Failing that, memory
2079 // is aligned anywhere.
2080 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2081 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2082 "alignment_hint " UINTX_FORMAT "...",
2083 bytes, requested_addr, alignment_hint);
2084
2085 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2086 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2087 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2088 return NULL;
2089 }
2090
2091 // We must prevent anyone from attaching too close to the
2092 // BRK because that may cause malloc OOM.
2093 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2094 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2095 "Will attach anywhere.", requested_addr);
2096 // Act like the OS refused to attach there.
2097 requested_addr = NULL;
2098 }
2099
2100 // Specify one or the other but not both.
2101 assert0(!(requested_addr != NULL && alignment_hint > 0));
2102
2103 // In 64K mode, we claim the global page size (os::vm_page_size())
2104 // is 64K. This is one of the few points where that illusion may
2105 // break, because mmap() will always return memory aligned to 4K. So
2106 // we must ensure we only ever return memory aligned to 64k.
2107 if (alignment_hint) {
2108 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2109 } else {
2110 alignment_hint = os::vm_page_size();
2111 }
2112
2113 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2114 const size_t size = align_up(bytes, os::vm_page_size());
2115
2116 // alignment: Allocate memory large enough to include an aligned range of the right size and
2117 // cut off the leading and trailing waste pages.
2118 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2119 const size_t extra_size = size + alignment_hint;
2120
2121 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2122 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2123 int flags = MAP_ANONYMOUS | MAP_SHARED;
2124
2125 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2126 // it means if wishaddress is given but MAP_FIXED is not set.
2127 //
2128 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2129 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2130 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2131 // get clobbered.
2132 if (requested_addr != NULL) {
2133 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2134 flags |= MAP_FIXED;
2135 }
2136 }
2137
2138 char* addr = (char*)::mmap(requested_addr, extra_size,
2139 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2140
2141 if (addr == MAP_FAILED) {
2142 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2143 return NULL;
2144 }
2145
2146 // Handle alignment.
2147 char* const addr_aligned = align_up(addr, alignment_hint);
2148 const size_t waste_pre = addr_aligned - addr;
2149 char* const addr_aligned_end = addr_aligned + size;
2150 const size_t waste_post = extra_size - waste_pre - size;
2151 if (waste_pre > 0) {
2152 ::munmap(addr, waste_pre);
2153 }
2154 if (waste_post > 0) {
2155 ::munmap(addr_aligned_end, waste_post);
2156 }
2157 addr = addr_aligned;
2158
2159 if (addr) {
2160 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2161 addr, addr + bytes, bytes);
2162 } else {
2163 if (requested_addr != NULL) {
2164 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2165 } else {
2166 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2167 }
2168 }
2169
2170 // bookkeeping
2171 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2172
2173 // Test alignment, see above.
2174 assert0(is_aligned_to(addr, os::vm_page_size()));
2175
2176 return addr;
2177 }
2178
2179 static bool release_mmaped_memory(char* addr, size_t size) {
2180 assert0(is_aligned_to(addr, os::vm_page_size()));
2181 assert0(is_aligned_to(size, os::vm_page_size()));
2182
2183 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2184 addr, addr + size - 1);
2185 bool rc = false;
2186
2187 if (::munmap(addr, size) != 0) {
2188 trcVerbose("failed (%d)\n", errno);
2189 rc = false;
2190 } else {
2191 trcVerbose("ok.");
2192 rc = true;
2193 }
2194
2195 return rc;
2196 }
2197
2198 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2199
2200 assert0(is_aligned_to(addr, os::vm_page_size()));
2201 assert0(is_aligned_to(size, os::vm_page_size()));
2202
2203 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2204 addr, addr + size - 1);
2205 bool rc = false;
2206
2207 // Uncommit mmap memory with msync MS_INVALIDATE.
2208 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2209 trcVerbose("failed (%d)\n", errno);
2210 rc = false;
2211 } else {
2212 trcVerbose("ok.");
2213 rc = true;
2214 }
2215
2216 return rc;
2217 }
2218
2219 int os::vm_page_size() {
2220 // Seems redundant as all get out.
2221 assert(os::Aix::page_size() != -1, "must call os::init");
2222 return os::Aix::page_size();
2223 }
2224
2225 // Aix allocates memory by pages.
2226 int os::vm_allocation_granularity() {
2227 assert(os::Aix::page_size() != -1, "must call os::init");
2228 return os::Aix::page_size();
2229 }
2230
2231 #ifdef PRODUCT
2232 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2233 int err) {
2234 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2235 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2236 os::errno_name(err), err);
2237 }
2238 #endif
2239
2240 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2241 const char* mesg) {
2242 assert(mesg != NULL, "mesg must be specified");
2243 if (!pd_commit_memory(addr, size, exec)) {
2244 // Add extra info in product mode for vm_exit_out_of_memory():
2245 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2246 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2247 }
2248 }
2249
2250 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2251
2252 assert(is_aligned_to(addr, os::vm_page_size()),
2253 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2254 p2i(addr), os::vm_page_size());
2255 assert(is_aligned_to(size, os::vm_page_size()),
2256 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2257 size, os::vm_page_size());
2258
2259 vmembk_t* const vmi = vmembk_find(addr);
2260 guarantee0(vmi);
2261 vmi->assert_is_valid_subrange(addr, size);
2262
2263 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2264
2265 if (UseExplicitCommit) {
2266 // AIX commits memory on touch. So, touch all pages to be committed.
2267 for (char* p = addr; p < (addr + size); p += 4*K) {
2268 *p = '\0';
2269 }
2270 }
2271
2272 return true;
2273 }
2274
2275 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2276 return pd_commit_memory(addr, size, exec);
2277 }
2278
2279 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2280 size_t alignment_hint, bool exec,
2281 const char* mesg) {
2282 // Alignment_hint is ignored on this OS.
2283 pd_commit_memory_or_exit(addr, size, exec, mesg);
2284 }
2285
2286 bool os::pd_uncommit_memory(char* addr, size_t size) {
2287 assert(is_aligned_to(addr, os::vm_page_size()),
2288 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2289 p2i(addr), os::vm_page_size());
2290 assert(is_aligned_to(size, os::vm_page_size()),
2291 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2292 size, os::vm_page_size());
2293
2294 // Dynamically do different things for mmap/shmat.
2295 const vmembk_t* const vmi = vmembk_find(addr);
2296 guarantee0(vmi);
2297 vmi->assert_is_valid_subrange(addr, size);
2298
2299 if (vmi->type == VMEM_SHMATED) {
2300 return uncommit_shmated_memory(addr, size);
2301 } else {
2302 return uncommit_mmaped_memory(addr, size);
2303 }
2304 }
2305
2306 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2307 // Do not call this; no need to commit stack pages on AIX.
2308 ShouldNotReachHere();
2309 return true;
2310 }
2311
2312 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2313 // Do not call this; no need to commit stack pages on AIX.
2314 ShouldNotReachHere();
2315 return true;
2316 }
2317
2318 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2319 }
2320
2321 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2322 }
2323
2324 void os::numa_make_global(char *addr, size_t bytes) {
2325 }
2326
2327 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2328 }
2329
2330 bool os::numa_topology_changed() {
2331 return false;
2332 }
2333
2334 size_t os::numa_get_groups_num() {
2335 return 1;
2336 }
2337
2338 int os::numa_get_group_id() {
2339 return 0;
2340 }
2341
2342 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2343 if (size > 0) {
2344 ids[0] = 0;
2345 return 1;
2346 }
2347 return 0;
2348 }
2349
2350 bool os::get_page_info(char *start, page_info* info) {
2351 return false;
2352 }
2353
2354 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2355 return end;
2356 }
2357
2358 // Reserves and attaches a shared memory segment.
2359 // Will assert if a wish address is given and could not be obtained.
2360 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2361
2362 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2363 // thereby clobbering old mappings at that place. That is probably
2364 // not intended, never used and almost certainly an error were it
2365 // ever be used this way (to try attaching at a specified address
2366 // without clobbering old mappings an alternate API exists,
2367 // os::attempt_reserve_memory_at()).
2368 // Instead of mimicking the dangerous coding of the other platforms, here I
2369 // just ignore the request address (release) or assert(debug).
2370 assert0(requested_addr == NULL);
2371
2372 // Always round to os::vm_page_size(), which may be larger than 4K.
2373 bytes = align_up(bytes, os::vm_page_size());
2374 const size_t alignment_hint0 =
2375 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2376
2377 // In 4K mode always use mmap.
2378 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2379 if (os::vm_page_size() == 4*K) {
2380 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2381 } else {
2382 if (bytes >= Use64KPagesThreshold) {
2383 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2384 } else {
2385 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2386 }
2387 }
2388 }
2389
2390 bool os::pd_release_memory(char* addr, size_t size) {
2391
2392 // Dynamically do different things for mmap/shmat.
2393 vmembk_t* const vmi = vmembk_find(addr);
2394 guarantee0(vmi);
2395
2396 // Always round to os::vm_page_size(), which may be larger than 4K.
2397 size = align_up(size, os::vm_page_size());
2398 addr = align_up(addr, os::vm_page_size());
2399
2400 bool rc = false;
2401 bool remove_bookkeeping = false;
2402 if (vmi->type == VMEM_SHMATED) {
2403 // For shmatted memory, we do:
2404 // - If user wants to release the whole range, release the memory (shmdt).
2405 // - If user only wants to release a partial range, uncommit (disclaim) that
2406 // range. That way, at least, we do not use memory anymore (bust still page
2407 // table space).
2408 vmi->assert_is_valid_subrange(addr, size);
2409 if (addr == vmi->addr && size == vmi->size) {
2410 rc = release_shmated_memory(addr, size);
2411 remove_bookkeeping = true;
2412 } else {
2413 rc = uncommit_shmated_memory(addr, size);
2414 }
2415 } else {
2416 // User may unmap partial regions but region has to be fully contained.
2417 #ifdef ASSERT
2418 vmi->assert_is_valid_subrange(addr, size);
2419 #endif
2420 rc = release_mmaped_memory(addr, size);
2421 remove_bookkeeping = true;
2422 }
2423
2424 // update bookkeeping
2425 if (rc && remove_bookkeeping) {
2426 vmembk_remove(vmi);
2427 }
2428
2429 return rc;
2430 }
2431
2432 static bool checked_mprotect(char* addr, size_t size, int prot) {
2433
2434 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2435 // not tell me if protection failed when trying to protect an un-protectable range.
2436 //
2437 // This means if the memory was allocated using shmget/shmat, protection wont work
2438 // but mprotect will still return 0:
2439 //
2440 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2441
2442 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2443
2444 if (!rc) {
2445 const char* const s_errno = os::errno_name(errno);
2446 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2447 return false;
2448 }
2449
2450 // mprotect success check
2451 //
2452 // Mprotect said it changed the protection but can I believe it?
2453 //
2454 // To be sure I need to check the protection afterwards. Try to
2455 // read from protected memory and check whether that causes a segfault.
2456 //
2457 if (!os::Aix::xpg_sus_mode()) {
2458
2459 if (CanUseSafeFetch32()) {
2460
2461 const bool read_protected =
2462 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2463 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2464
2465 if (prot & PROT_READ) {
2466 rc = !read_protected;
2467 } else {
2468 rc = read_protected;
2469 }
2470
2471 if (!rc) {
2472 if (os::Aix::on_pase()) {
2473 // There is an issue on older PASE systems where mprotect() will return success but the
2474 // memory will not be protected.
2475 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2476 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2477 // a stack. It is an OS error.
2478 //
2479 // A valid strategy is just to try again. This usually works. :-/
2480
2481 ::usleep(1000);
2482 if (::mprotect(addr, size, prot) == 0) {
2483 const bool read_protected_2 =
2484 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2485 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2486 rc = true;
2487 }
2488 }
2489 }
2490 }
2491 }
2492
2493 assert(rc == true, "mprotect failed.");
2494
2495 return rc;
2496 }
2497
2498 // Set protections specified
2499 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2500 unsigned int p = 0;
2501 switch (prot) {
2502 case MEM_PROT_NONE: p = PROT_NONE; break;
2503 case MEM_PROT_READ: p = PROT_READ; break;
2504 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2505 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2506 default:
2507 ShouldNotReachHere();
2508 }
2509 // is_committed is unused.
2510 return checked_mprotect(addr, size, p);
2511 }
2512
2513 bool os::guard_memory(char* addr, size_t size) {
2514 return checked_mprotect(addr, size, PROT_NONE);
2515 }
2516
2517 bool os::unguard_memory(char* addr, size_t size) {
2518 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2519 }
2520
2521 // Large page support
2522
2523 static size_t _large_page_size = 0;
2524
2525 // Enable large page support if OS allows that.
2526 void os::large_page_init() {
2527 return; // Nothing to do. See query_multipage_support and friends.
2528 }
2529
2530 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2531 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2532 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2533 // so this is not needed.
2534 assert(false, "should not be called on AIX");
2535 return NULL;
2536 }
2537
2538 bool os::release_memory_special(char* base, size_t bytes) {
2539 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2540 Unimplemented();
2541 return false;
2542 }
2543
2544 size_t os::large_page_size() {
2545 return _large_page_size;
2546 }
2547
2548 bool os::can_commit_large_page_memory() {
2549 // Does not matter, we do not support huge pages.
2550 return false;
2551 }
2552
2553 bool os::can_execute_large_page_memory() {
2554 // Does not matter, we do not support huge pages.
2555 return false;
2556 }
2557
2558 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2559 assert(file_desc >= 0, "file_desc is not valid");
2560 char* result = NULL;
2561
2562 // Always round to os::vm_page_size(), which may be larger than 4K.
2563 bytes = align_up(bytes, os::vm_page_size());
2564 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2565
2566 if (result != NULL) {
2567 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2568 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2569 }
2570 }
2571 return result;
2572 }
2573
2574 // Reserve memory at an arbitrary address, only if that area is
2575 // available (and not reserved for something else).
2576 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2577 char* addr = NULL;
2578
2579 // Always round to os::vm_page_size(), which may be larger than 4K.
2580 bytes = align_up(bytes, os::vm_page_size());
2581
2582 // In 4K mode always use mmap.
2583 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2584 if (os::vm_page_size() == 4*K) {
2585 return reserve_mmaped_memory(bytes, requested_addr, 0);
2586 } else {
2587 if (bytes >= Use64KPagesThreshold) {
2588 return reserve_shmated_memory(bytes, requested_addr, 0);
2589 } else {
2590 return reserve_mmaped_memory(bytes, requested_addr, 0);
2591 }
2592 }
2593
2594 return addr;
2595 }
2596
2597 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2598 return ::read(fd, buf, nBytes);
2599 }
2600
2601 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2602 return ::pread(fd, buf, nBytes, offset);
2603 }
2604
2605 void os::naked_short_sleep(jlong ms) {
2606 struct timespec req;
2607
2608 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2609 req.tv_sec = 0;
2610 if (ms > 0) {
2611 req.tv_nsec = (ms % 1000) * 1000000;
2612 }
2613 else {
2614 req.tv_nsec = 1;
2615 }
2616
2617 nanosleep(&req, NULL);
2618
2619 return;
2620 }
2621
2622 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2623 void os::infinite_sleep() {
2624 while (true) { // sleep forever ...
2625 ::sleep(100); // ... 100 seconds at a time
2626 }
2627 }
2628
2629 // Used to convert frequent JVM_Yield() to nops
2630 bool os::dont_yield() {
2631 return DontYieldALot;
2632 }
2633
2634 void os::naked_yield() {
2635 sched_yield();
2636 }
2637
2638 ////////////////////////////////////////////////////////////////////////////////
2639 // thread priority support
2640
2641 // From AIX manpage to pthread_setschedparam
2642 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2643 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2644 //
2645 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2646 // range from 40 to 80, where 40 is the least favored priority and 80
2647 // is the most favored."
2648 //
2649 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2650 // scheduling there; however, this still leaves iSeries.)
2651 //
2652 // We use the same values for AIX and PASE.
2653 int os::java_to_os_priority[CriticalPriority + 1] = {
2654 54, // 0 Entry should never be used
2655
2656 55, // 1 MinPriority
2657 55, // 2
2658 56, // 3
2659
2660 56, // 4
2661 57, // 5 NormPriority
2662 57, // 6
2663
2664 58, // 7
2665 58, // 8
2666 59, // 9 NearMaxPriority
2667
2668 60, // 10 MaxPriority
2669
2670 60 // 11 CriticalPriority
2671 };
2672
2673 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2674 if (!UseThreadPriorities) return OS_OK;
2675 pthread_t thr = thread->osthread()->pthread_id();
2676 int policy = SCHED_OTHER;
2677 struct sched_param param;
2678 param.sched_priority = newpri;
2679 int ret = pthread_setschedparam(thr, policy, ¶m);
2680
2681 if (ret != 0) {
2682 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2683 (int)thr, newpri, ret, os::errno_name(ret));
2684 }
2685 return (ret == 0) ? OS_OK : OS_ERR;
2686 }
2687
2688 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2689 if (!UseThreadPriorities) {
2690 *priority_ptr = java_to_os_priority[NormPriority];
2691 return OS_OK;
2692 }
2693 pthread_t thr = thread->osthread()->pthread_id();
2694 int policy = SCHED_OTHER;
2695 struct sched_param param;
2696 int ret = pthread_getschedparam(thr, &policy, ¶m);
2697 *priority_ptr = param.sched_priority;
2698
2699 return (ret == 0) ? OS_OK : OS_ERR;
2700 }
2701
2702 ////////////////////////////////////////////////////////////////////////////////
2703 // suspend/resume support
2704
2705 // The low-level signal-based suspend/resume support is a remnant from the
2706 // old VM-suspension that used to be for java-suspension, safepoints etc,
2707 // within hotspot. Currently used by JFR's OSThreadSampler
2708 //
2709 // The remaining code is greatly simplified from the more general suspension
2710 // code that used to be used.
2711 //
2712 // The protocol is quite simple:
2713 // - suspend:
2714 // - sends a signal to the target thread
2715 // - polls the suspend state of the osthread using a yield loop
2716 // - target thread signal handler (SR_handler) sets suspend state
2717 // and blocks in sigsuspend until continued
2718 // - resume:
2719 // - sets target osthread state to continue
2720 // - sends signal to end the sigsuspend loop in the SR_handler
2721 //
2722 // Note that the SR_lock plays no role in this suspend/resume protocol,
2723 // but is checked for NULL in SR_handler as a thread termination indicator.
2724 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2725 //
2726 // Note that resume_clear_context() and suspend_save_context() are needed
2727 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2728 // which in part is used by:
2729 // - Forte Analyzer: AsyncGetCallTrace()
2730 // - StackBanging: get_frame_at_stack_banging_point()
2731
2732 static void resume_clear_context(OSThread *osthread) {
2733 osthread->set_ucontext(NULL);
2734 osthread->set_siginfo(NULL);
2735 }
2736
2737 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2738 osthread->set_ucontext(context);
2739 osthread->set_siginfo(siginfo);
2740 }
2741
2742 //
2743 // Handler function invoked when a thread's execution is suspended or
2744 // resumed. We have to be careful that only async-safe functions are
2745 // called here (Note: most pthread functions are not async safe and
2746 // should be avoided.)
2747 //
2748 // Note: sigwait() is a more natural fit than sigsuspend() from an
2749 // interface point of view, but sigwait() prevents the signal hander
2750 // from being run. libpthread would get very confused by not having
2751 // its signal handlers run and prevents sigwait()'s use with the
2752 // mutex granting granting signal.
2753 //
2754 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2755 //
2756 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2757 // Save and restore errno to avoid confusing native code with EINTR
2758 // after sigsuspend.
2759 int old_errno = errno;
2760
2761 Thread* thread = Thread::current_or_null_safe();
2762 assert(thread != NULL, "Missing current thread in SR_handler");
2763
2764 // On some systems we have seen signal delivery get "stuck" until the signal
2765 // mask is changed as part of thread termination. Check that the current thread
2766 // has not already terminated (via SR_lock()) - else the following assertion
2767 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2768 // destructor has completed.
2769
2770 if (thread->SR_lock() == NULL) {
2771 return;
2772 }
2773
2774 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2775
2776 OSThread* osthread = thread->osthread();
2777
2778 os::SuspendResume::State current = osthread->sr.state();
2779 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2780 suspend_save_context(osthread, siginfo, context);
2781
2782 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2783 os::SuspendResume::State state = osthread->sr.suspended();
2784 if (state == os::SuspendResume::SR_SUSPENDED) {
2785 sigset_t suspend_set; // signals for sigsuspend()
2786
2787 // get current set of blocked signals and unblock resume signal
2788 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2789 sigdelset(&suspend_set, SR_signum);
2790
2791 // wait here until we are resumed
2792 while (1) {
2793 sigsuspend(&suspend_set);
2794
2795 os::SuspendResume::State result = osthread->sr.running();
2796 if (result == os::SuspendResume::SR_RUNNING) {
2797 break;
2798 }
2799 }
2800
2801 } else if (state == os::SuspendResume::SR_RUNNING) {
2802 // request was cancelled, continue
2803 } else {
2804 ShouldNotReachHere();
2805 }
2806
2807 resume_clear_context(osthread);
2808 } else if (current == os::SuspendResume::SR_RUNNING) {
2809 // request was cancelled, continue
2810 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2811 // ignore
2812 } else {
2813 ShouldNotReachHere();
2814 }
2815
2816 errno = old_errno;
2817 }
2818
2819 static int SR_initialize() {
2820 struct sigaction act;
2821 char *s;
2822 // Get signal number to use for suspend/resume
2823 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2824 int sig = ::strtol(s, 0, 10);
2825 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2826 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2827 SR_signum = sig;
2828 } else {
2829 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2830 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2831 }
2832 }
2833
2834 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2835 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2836
2837 sigemptyset(&SR_sigset);
2838 sigaddset(&SR_sigset, SR_signum);
2839
2840 // Set up signal handler for suspend/resume.
2841 act.sa_flags = SA_RESTART|SA_SIGINFO;
2842 act.sa_handler = (void (*)(int)) SR_handler;
2843
2844 // SR_signum is blocked by default.
2845 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2846
2847 if (sigaction(SR_signum, &act, 0) == -1) {
2848 return -1;
2849 }
2850
2851 // Save signal flag
2852 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2853 return 0;
2854 }
2855
2856 static int SR_finalize() {
2857 return 0;
2858 }
2859
2860 static int sr_notify(OSThread* osthread) {
2861 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2862 assert_status(status == 0, status, "pthread_kill");
2863 return status;
2864 }
2865
2866 // "Randomly" selected value for how long we want to spin
2867 // before bailing out on suspending a thread, also how often
2868 // we send a signal to a thread we want to resume
2869 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2870 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2871
2872 // returns true on success and false on error - really an error is fatal
2873 // but this seems the normal response to library errors
2874 static bool do_suspend(OSThread* osthread) {
2875 assert(osthread->sr.is_running(), "thread should be running");
2876 // mark as suspended and send signal
2877
2878 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2879 // failed to switch, state wasn't running?
2880 ShouldNotReachHere();
2881 return false;
2882 }
2883
2884 if (sr_notify(osthread) != 0) {
2885 // try to cancel, switch to running
2886
2887 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2888 if (result == os::SuspendResume::SR_RUNNING) {
2889 // cancelled
2890 return false;
2891 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2892 // somehow managed to suspend
2893 return true;
2894 } else {
2895 ShouldNotReachHere();
2896 return false;
2897 }
2898 }
2899
2900 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2901
2902 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2903 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2904 os::naked_yield();
2905 }
2906
2907 // timeout, try to cancel the request
2908 if (n >= RANDOMLY_LARGE_INTEGER) {
2909 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2910 if (cancelled == os::SuspendResume::SR_RUNNING) {
2911 return false;
2912 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2913 return true;
2914 } else {
2915 ShouldNotReachHere();
2916 return false;
2917 }
2918 }
2919 }
2920
2921 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2922 return true;
2923 }
2924
2925 static void do_resume(OSThread* osthread) {
2926 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2927
2928 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2929 // failed to switch to WAKEUP_REQUEST
2930 ShouldNotReachHere();
2931 return;
2932 }
2933
2934 while (!osthread->sr.is_running()) {
2935 if (sr_notify(osthread) == 0) {
2936 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2937 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2938 os::naked_yield();
2939 }
2940 }
2941 } else {
2942 ShouldNotReachHere();
2943 }
2944 }
2945
2946 guarantee(osthread->sr.is_running(), "Must be running!");
2947 }
2948
2949 ///////////////////////////////////////////////////////////////////////////////////
2950 // signal handling (except suspend/resume)
2951
2952 // This routine may be used by user applications as a "hook" to catch signals.
2953 // The user-defined signal handler must pass unrecognized signals to this
2954 // routine, and if it returns true (non-zero), then the signal handler must
2955 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2956 // routine will never retun false (zero), but instead will execute a VM panic
2957 // routine kill the process.
2958 //
2959 // If this routine returns false, it is OK to call it again. This allows
2960 // the user-defined signal handler to perform checks either before or after
2961 // the VM performs its own checks. Naturally, the user code would be making
2962 // a serious error if it tried to handle an exception (such as a null check
2963 // or breakpoint) that the VM was generating for its own correct operation.
2964 //
2965 // This routine may recognize any of the following kinds of signals:
2966 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2967 // It should be consulted by handlers for any of those signals.
2968 //
2969 // The caller of this routine must pass in the three arguments supplied
2970 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2971 // field of the structure passed to sigaction(). This routine assumes that
2972 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2973 //
2974 // Note that the VM will print warnings if it detects conflicting signal
2975 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2976 //
2977 extern "C" JNIEXPORT int
2978 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2979
2980 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2981 // to be the thing to call; documentation is not terribly clear about whether
2982 // pthread_sigmask also works, and if it does, whether it does the same.
2983 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2984 const int rc = ::pthread_sigmask(how, set, oset);
2985 // return value semantics differ slightly for error case:
2986 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2987 // (so, pthread_sigmask is more theadsafe for error handling)
2988 // But success is always 0.
2989 return rc == 0 ? true : false;
2990 }
2991
2992 // Function to unblock all signals which are, according
2993 // to POSIX, typical program error signals. If they happen while being blocked,
2994 // they typically will bring down the process immediately.
2995 bool unblock_program_error_signals() {
2996 sigset_t set;
2997 ::sigemptyset(&set);
2998 ::sigaddset(&set, SIGILL);
2999 ::sigaddset(&set, SIGBUS);
3000 ::sigaddset(&set, SIGFPE);
3001 ::sigaddset(&set, SIGSEGV);
3002 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3003 }
3004
3005 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3006 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3007 assert(info != NULL && uc != NULL, "it must be old kernel");
3008
3009 // Never leave program error signals blocked;
3010 // on all our platforms they would bring down the process immediately when
3011 // getting raised while being blocked.
3012 unblock_program_error_signals();
3013
3014 int orig_errno = errno; // Preserve errno value over signal handler.
3015 JVM_handle_aix_signal(sig, info, uc, true);
3016 errno = orig_errno;
3017 }
3018
3019 // This boolean allows users to forward their own non-matching signals
3020 // to JVM_handle_aix_signal, harmlessly.
3021 bool os::Aix::signal_handlers_are_installed = false;
3022
3023 // For signal-chaining
3024 struct sigaction sigact[NSIG];
3025 sigset_t sigs;
3026 bool os::Aix::libjsig_is_loaded = false;
3027 typedef struct sigaction *(*get_signal_t)(int);
3028 get_signal_t os::Aix::get_signal_action = NULL;
3029
3030 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3031 struct sigaction *actp = NULL;
3032
3033 if (libjsig_is_loaded) {
3034 // Retrieve the old signal handler from libjsig
3035 actp = (*get_signal_action)(sig);
3036 }
3037 if (actp == NULL) {
3038 // Retrieve the preinstalled signal handler from jvm
3039 actp = get_preinstalled_handler(sig);
3040 }
3041
3042 return actp;
3043 }
3044
3045 static bool call_chained_handler(struct sigaction *actp, int sig,
3046 siginfo_t *siginfo, void *context) {
3047 // Call the old signal handler
3048 if (actp->sa_handler == SIG_DFL) {
3049 // It's more reasonable to let jvm treat it as an unexpected exception
3050 // instead of taking the default action.
3051 return false;
3052 } else if (actp->sa_handler != SIG_IGN) {
3053 if ((actp->sa_flags & SA_NODEFER) == 0) {
3054 // automaticlly block the signal
3055 sigaddset(&(actp->sa_mask), sig);
3056 }
3057
3058 sa_handler_t hand = NULL;
3059 sa_sigaction_t sa = NULL;
3060 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3061 // retrieve the chained handler
3062 if (siginfo_flag_set) {
3063 sa = actp->sa_sigaction;
3064 } else {
3065 hand = actp->sa_handler;
3066 }
3067
3068 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3069 actp->sa_handler = SIG_DFL;
3070 }
3071
3072 // try to honor the signal mask
3073 sigset_t oset;
3074 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3075
3076 // call into the chained handler
3077 if (siginfo_flag_set) {
3078 (*sa)(sig, siginfo, context);
3079 } else {
3080 (*hand)(sig);
3081 }
3082
3083 // restore the signal mask
3084 pthread_sigmask(SIG_SETMASK, &oset, 0);
3085 }
3086 // Tell jvm's signal handler the signal is taken care of.
3087 return true;
3088 }
3089
3090 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3091 bool chained = false;
3092 // signal-chaining
3093 if (UseSignalChaining) {
3094 struct sigaction *actp = get_chained_signal_action(sig);
3095 if (actp != NULL) {
3096 chained = call_chained_handler(actp, sig, siginfo, context);
3097 }
3098 }
3099 return chained;
3100 }
3101
3102 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3103 if (sigismember(&sigs, sig)) {
3104 return &sigact[sig];
3105 }
3106 return NULL;
3107 }
3108
3109 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3110 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3111 sigact[sig] = oldAct;
3112 sigaddset(&sigs, sig);
3113 }
3114
3115 // for diagnostic
3116 int sigflags[NSIG];
3117
3118 int os::Aix::get_our_sigflags(int sig) {
3119 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3120 return sigflags[sig];
3121 }
3122
3123 void os::Aix::set_our_sigflags(int sig, int flags) {
3124 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3125 if (sig > 0 && sig < NSIG) {
3126 sigflags[sig] = flags;
3127 }
3128 }
3129
3130 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3131 // Check for overwrite.
3132 struct sigaction oldAct;
3133 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3134
3135 void* oldhand = oldAct.sa_sigaction
3136 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3137 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3138 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3139 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3140 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3141 if (AllowUserSignalHandlers || !set_installed) {
3142 // Do not overwrite; user takes responsibility to forward to us.
3143 return;
3144 } else if (UseSignalChaining) {
3145 // save the old handler in jvm
3146 save_preinstalled_handler(sig, oldAct);
3147 // libjsig also interposes the sigaction() call below and saves the
3148 // old sigaction on it own.
3149 } else {
3150 fatal("Encountered unexpected pre-existing sigaction handler "
3151 "%#lx for signal %d.", (long)oldhand, sig);
3152 }
3153 }
3154
3155 struct sigaction sigAct;
3156 sigfillset(&(sigAct.sa_mask));
3157 if (!set_installed) {
3158 sigAct.sa_handler = SIG_DFL;
3159 sigAct.sa_flags = SA_RESTART;
3160 } else {
3161 sigAct.sa_sigaction = javaSignalHandler;
3162 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3163 }
3164 // Save flags, which are set by ours
3165 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3166 sigflags[sig] = sigAct.sa_flags;
3167
3168 int ret = sigaction(sig, &sigAct, &oldAct);
3169 assert(ret == 0, "check");
3170
3171 void* oldhand2 = oldAct.sa_sigaction
3172 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3173 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3174 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3175 }
3176
3177 // install signal handlers for signals that HotSpot needs to
3178 // handle in order to support Java-level exception handling.
3179 void os::Aix::install_signal_handlers() {
3180 if (!signal_handlers_are_installed) {
3181 signal_handlers_are_installed = true;
3182
3183 // signal-chaining
3184 typedef void (*signal_setting_t)();
3185 signal_setting_t begin_signal_setting = NULL;
3186 signal_setting_t end_signal_setting = NULL;
3187 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3188 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3189 if (begin_signal_setting != NULL) {
3190 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3191 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3192 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3193 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3194 libjsig_is_loaded = true;
3195 assert(UseSignalChaining, "should enable signal-chaining");
3196 }
3197 if (libjsig_is_loaded) {
3198 // Tell libjsig jvm is setting signal handlers.
3199 (*begin_signal_setting)();
3200 }
3201
3202 ::sigemptyset(&sigs);
3203 set_signal_handler(SIGSEGV, true);
3204 set_signal_handler(SIGPIPE, true);
3205 set_signal_handler(SIGBUS, true);
3206 set_signal_handler(SIGILL, true);
3207 set_signal_handler(SIGFPE, true);
3208 set_signal_handler(SIGTRAP, true);
3209 set_signal_handler(SIGXFSZ, true);
3210
3211 if (libjsig_is_loaded) {
3212 // Tell libjsig jvm finishes setting signal handlers.
3213 (*end_signal_setting)();
3214 }
3215
3216 // We don't activate signal checker if libjsig is in place, we trust ourselves
3217 // and if UserSignalHandler is installed all bets are off.
3218 // Log that signal checking is off only if -verbose:jni is specified.
3219 if (CheckJNICalls) {
3220 if (libjsig_is_loaded) {
3221 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3222 check_signals = false;
3223 }
3224 if (AllowUserSignalHandlers) {
3225 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3226 check_signals = false;
3227 }
3228 // Need to initialize check_signal_done.
3229 ::sigemptyset(&check_signal_done);
3230 }
3231 }
3232 }
3233
3234 static const char* get_signal_handler_name(address handler,
3235 char* buf, int buflen) {
3236 int offset;
3237 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3238 if (found) {
3239 // skip directory names
3240 const char *p1, *p2;
3241 p1 = buf;
3242 size_t len = strlen(os::file_separator());
3243 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3244 // The way os::dll_address_to_library_name is implemented on Aix
3245 // right now, it always returns -1 for the offset which is not
3246 // terribly informative.
3247 // Will fix that. For now, omit the offset.
3248 jio_snprintf(buf, buflen, "%s", p1);
3249 } else {
3250 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3251 }
3252 return buf;
3253 }
3254
3255 static void print_signal_handler(outputStream* st, int sig,
3256 char* buf, size_t buflen) {
3257 struct sigaction sa;
3258 sigaction(sig, NULL, &sa);
3259
3260 st->print("%s: ", os::exception_name(sig, buf, buflen));
3261
3262 address handler = (sa.sa_flags & SA_SIGINFO)
3263 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3264 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3265
3266 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3267 st->print("SIG_DFL");
3268 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3269 st->print("SIG_IGN");
3270 } else {
3271 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3272 }
3273
3274 // Print readable mask.
3275 st->print(", sa_mask[0]=");
3276 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3277
3278 address rh = VMError::get_resetted_sighandler(sig);
3279 // May be, handler was resetted by VMError?
3280 if (rh != NULL) {
3281 handler = rh;
3282 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3283 }
3284
3285 // Print textual representation of sa_flags.
3286 st->print(", sa_flags=");
3287 os::Posix::print_sa_flags(st, sa.sa_flags);
3288
3289 // Check: is it our handler?
3290 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3291 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3292 // It is our signal handler.
3293 // Check for flags, reset system-used one!
3294 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3295 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3296 os::Aix::get_our_sigflags(sig));
3297 }
3298 }
3299 st->cr();
3300 }
3301
3302 #define DO_SIGNAL_CHECK(sig) \
3303 if (!sigismember(&check_signal_done, sig)) \
3304 os::Aix::check_signal_handler(sig)
3305
3306 // This method is a periodic task to check for misbehaving JNI applications
3307 // under CheckJNI, we can add any periodic checks here
3308
3309 void os::run_periodic_checks() {
3310
3311 if (check_signals == false) return;
3312
3313 // SEGV and BUS if overridden could potentially prevent
3314 // generation of hs*.log in the event of a crash, debugging
3315 // such a case can be very challenging, so we absolutely
3316 // check the following for a good measure:
3317 DO_SIGNAL_CHECK(SIGSEGV);
3318 DO_SIGNAL_CHECK(SIGILL);
3319 DO_SIGNAL_CHECK(SIGFPE);
3320 DO_SIGNAL_CHECK(SIGBUS);
3321 DO_SIGNAL_CHECK(SIGPIPE);
3322 DO_SIGNAL_CHECK(SIGXFSZ);
3323 if (UseSIGTRAP) {
3324 DO_SIGNAL_CHECK(SIGTRAP);
3325 }
3326
3327 // ReduceSignalUsage allows the user to override these handlers
3328 // see comments at the very top and jvm_md.h
3329 if (!ReduceSignalUsage) {
3330 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3331 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3332 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3333 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3334 }
3335
3336 DO_SIGNAL_CHECK(SR_signum);
3337 }
3338
3339 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3340
3341 static os_sigaction_t os_sigaction = NULL;
3342
3343 void os::Aix::check_signal_handler(int sig) {
3344 char buf[O_BUFLEN];
3345 address jvmHandler = NULL;
3346
3347 struct sigaction act;
3348 if (os_sigaction == NULL) {
3349 // only trust the default sigaction, in case it has been interposed
3350 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3351 if (os_sigaction == NULL) return;
3352 }
3353
3354 os_sigaction(sig, (struct sigaction*)NULL, &act);
3355
3356 address thisHandler = (act.sa_flags & SA_SIGINFO)
3357 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3358 : CAST_FROM_FN_PTR(address, act.sa_handler);
3359
3360 switch(sig) {
3361 case SIGSEGV:
3362 case SIGBUS:
3363 case SIGFPE:
3364 case SIGPIPE:
3365 case SIGILL:
3366 case SIGXFSZ:
3367 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3368 break;
3369
3370 case SHUTDOWN1_SIGNAL:
3371 case SHUTDOWN2_SIGNAL:
3372 case SHUTDOWN3_SIGNAL:
3373 case BREAK_SIGNAL:
3374 jvmHandler = (address)user_handler();
3375 break;
3376
3377 default:
3378 if (sig == SR_signum) {
3379 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3380 } else {
3381 return;
3382 }
3383 break;
3384 }
3385
3386 if (thisHandler != jvmHandler) {
3387 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3388 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3389 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3390 // No need to check this sig any longer
3391 sigaddset(&check_signal_done, sig);
3392 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3393 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3394 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3395 exception_name(sig, buf, O_BUFLEN));
3396 }
3397 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3398 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3399 tty->print("expected:");
3400 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3401 tty->cr();
3402 tty->print(" found:");
3403 os::Posix::print_sa_flags(tty, act.sa_flags);
3404 tty->cr();
3405 // No need to check this sig any longer
3406 sigaddset(&check_signal_done, sig);
3407 }
3408
3409 // Dump all the signal
3410 if (sigismember(&check_signal_done, sig)) {
3411 print_signal_handlers(tty, buf, O_BUFLEN);
3412 }
3413 }
3414
3415 // To install functions for atexit system call
3416 extern "C" {
3417 static void perfMemory_exit_helper() {
3418 perfMemory_exit();
3419 }
3420 }
3421
3422 // This is called _before_ the most of global arguments have been parsed.
3423 void os::init(void) {
3424 // This is basic, we want to know if that ever changes.
3425 // (Shared memory boundary is supposed to be a 256M aligned.)
3426 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3427
3428 // Record process break at startup.
3429 g_brk_at_startup = (address) ::sbrk(0);
3430 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3431
3432 // First off, we need to know whether we run on AIX or PASE, and
3433 // the OS level we run on.
3434 os::Aix::initialize_os_info();
3435
3436 // Scan environment (SPEC1170 behaviour, etc).
3437 os::Aix::scan_environment();
3438
3439 // Probe multipage support.
3440 query_multipage_support();
3441
3442 // Act like we only have one page size by eliminating corner cases which
3443 // we did not support very well anyway.
3444 // We have two input conditions:
3445 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3446 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3447 // setting.
3448 // Data segment page size is important for us because it defines the thread stack page
3449 // size, which is needed for guard page handling, stack banging etc.
3450 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3451 // and should be allocated with 64k pages.
3452 //
3453 // So, we do the following:
3454 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3455 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3456 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3457 // 64k no --- AIX 5.2 ? ---
3458 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3459
3460 // We explicitly leave no option to change page size, because only upgrading would work,
3461 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3462
3463 if (g_multipage_support.datapsize == 4*K) {
3464 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3465 if (g_multipage_support.can_use_64K_pages) {
3466 // .. but we are able to use 64K pages dynamically.
3467 // This would be typical for java launchers which are not linked
3468 // with datapsize=64K (like, any other launcher but our own).
3469 //
3470 // In this case it would be smart to allocate the java heap with 64K
3471 // to get the performance benefit, and to fake 64k pages for the
3472 // data segment (when dealing with thread stacks).
3473 //
3474 // However, leave a possibility to downgrade to 4K, using
3475 // -XX:-Use64KPages.
3476 if (Use64KPages) {
3477 trcVerbose("64K page mode (faked for data segment)");
3478 Aix::_page_size = 64*K;
3479 } else {
3480 trcVerbose("4K page mode (Use64KPages=off)");
3481 Aix::_page_size = 4*K;
3482 }
3483 } else {
3484 // .. and not able to allocate 64k pages dynamically. Here, just
3485 // fall back to 4K paged mode and use mmap for everything.
3486 trcVerbose("4K page mode");
3487 Aix::_page_size = 4*K;
3488 FLAG_SET_ERGO(bool, Use64KPages, false);
3489 }
3490 } else {
3491 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3492 // This normally means that we can allocate 64k pages dynamically.
3493 // (There is one special case where this may be false: EXTSHM=on.
3494 // but we decided to not support that mode).
3495 assert0(g_multipage_support.can_use_64K_pages);
3496 Aix::_page_size = 64*K;
3497 trcVerbose("64K page mode");
3498 FLAG_SET_ERGO(bool, Use64KPages, true);
3499 }
3500
3501 // For now UseLargePages is just ignored.
3502 FLAG_SET_ERGO(bool, UseLargePages, false);
3503 _page_sizes[0] = 0;
3504
3505 // debug trace
3506 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3507
3508 // Next, we need to initialize libo4 and libperfstat libraries.
3509 if (os::Aix::on_pase()) {
3510 os::Aix::initialize_libo4();
3511 } else {
3512 os::Aix::initialize_libperfstat();
3513 }
3514
3515 // Reset the perfstat information provided by ODM.
3516 if (os::Aix::on_aix()) {
3517 libperfstat::perfstat_reset();
3518 }
3519
3520 // Now initialze basic system properties. Note that for some of the values we
3521 // need libperfstat etc.
3522 os::Aix::initialize_system_info();
3523
3524 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3525
3526 init_random(1234567);
3527
3528 // _main_thread points to the thread that created/loaded the JVM.
3529 Aix::_main_thread = pthread_self();
3530
3531 initial_time_count = os::elapsed_counter();
3532
3533 os::Posix::init();
3534 }
3535
3536 // This is called _after_ the global arguments have been parsed.
3537 jint os::init_2(void) {
3538
3539 // This could be set after os::Posix::init() but all platforms
3540 // have to set it the same so we have to mirror Solaris.
3541 DEBUG_ONLY(os::set_mutex_init_done();)
3542
3543 os::Posix::init_2();
3544
3545 if (os::Aix::on_pase()) {
3546 trcVerbose("Running on PASE.");
3547 } else {
3548 trcVerbose("Running on AIX (not PASE).");
3549 }
3550
3551 trcVerbose("processor count: %d", os::_processor_count);
3552 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3553
3554 // Initially build up the loaded dll map.
3555 LoadedLibraries::reload();
3556 if (Verbose) {
3557 trcVerbose("Loaded Libraries: ");
3558 LoadedLibraries::print(tty);
3559 }
3560
3561 // initialize suspend/resume support - must do this before signal_sets_init()
3562 if (SR_initialize() != 0) {
3563 perror("SR_initialize failed");
3564 return JNI_ERR;
3565 }
3566
3567 Aix::signal_sets_init();
3568 Aix::install_signal_handlers();
3569 // Initialize data for jdk.internal.misc.Signal
3570 if (!ReduceSignalUsage) {
3571 jdk_misc_signal_init();
3572 }
3573
3574 // Check and sets minimum stack sizes against command line options
3575 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3576 return JNI_ERR;
3577 }
3578
3579 if (UseNUMA) {
3580 UseNUMA = false;
3581 warning("NUMA optimizations are not available on this OS.");
3582 }
3583
3584 if (MaxFDLimit) {
3585 // Set the number of file descriptors to max. print out error
3586 // if getrlimit/setrlimit fails but continue regardless.
3587 struct rlimit nbr_files;
3588 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3589 if (status != 0) {
3590 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3591 } else {
3592 nbr_files.rlim_cur = nbr_files.rlim_max;
3593 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3594 if (status != 0) {
3595 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3596 }
3597 }
3598 }
3599
3600 if (PerfAllowAtExitRegistration) {
3601 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3602 // At exit functions can be delayed until process exit time, which
3603 // can be problematic for embedded VM situations. Embedded VMs should
3604 // call DestroyJavaVM() to assure that VM resources are released.
3605
3606 // Note: perfMemory_exit_helper atexit function may be removed in
3607 // the future if the appropriate cleanup code can be added to the
3608 // VM_Exit VMOperation's doit method.
3609 if (atexit(perfMemory_exit_helper) != 0) {
3610 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3611 }
3612 }
3613
3614 return JNI_OK;
3615 }
3616
3617 // Mark the polling page as unreadable
3618 void os::make_polling_page_unreadable(void) {
3619 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3620 fatal("Could not disable polling page");
3621 }
3622 };
3623
3624 // Mark the polling page as readable
3625 void os::make_polling_page_readable(void) {
3626 // Changed according to os_linux.cpp.
3627 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3628 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3629 }
3630 };
3631
3632 int os::active_processor_count() {
3633 // User has overridden the number of active processors
3634 if (ActiveProcessorCount > 0) {
3635 log_trace(os)("active_processor_count: "
3636 "active processor count set by user : %d",
3637 ActiveProcessorCount);
3638 return ActiveProcessorCount;
3639 }
3640
3641 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3642 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3643 return online_cpus;
3644 }
3645
3646 void os::set_native_thread_name(const char *name) {
3647 // Not yet implemented.
3648 return;
3649 }
3650
3651 bool os::distribute_processes(uint length, uint* distribution) {
3652 // Not yet implemented.
3653 return false;
3654 }
3655
3656 bool os::bind_to_processor(uint processor_id) {
3657 // Not yet implemented.
3658 return false;
3659 }
3660
3661 void os::SuspendedThreadTask::internal_do_task() {
3662 if (do_suspend(_thread->osthread())) {
3663 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3664 do_task(context);
3665 do_resume(_thread->osthread());
3666 }
3667 }
3668
3669 ////////////////////////////////////////////////////////////////////////////////
3670 // debug support
3671
3672 bool os::find(address addr, outputStream* st) {
3673
3674 st->print(PTR_FORMAT ": ", addr);
3675
3676 loaded_module_t lm;
3677 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3678 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3679 st->print_cr("%s", lm.path);
3680 return true;
3681 }
3682
3683 return false;
3684 }
3685
3686 ////////////////////////////////////////////////////////////////////////////////
3687 // misc
3688
3689 // This does not do anything on Aix. This is basically a hook for being
3690 // able to use structured exception handling (thread-local exception filters)
3691 // on, e.g., Win32.
3692 void
3693 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3694 JavaCallArguments* args, Thread* thread) {
3695 f(value, method, args, thread);
3696 }
3697
3698 void os::print_statistics() {
3699 }
3700
3701 bool os::message_box(const char* title, const char* message) {
3702 int i;
3703 fdStream err(defaultStream::error_fd());
3704 for (i = 0; i < 78; i++) err.print_raw("=");
3705 err.cr();
3706 err.print_raw_cr(title);
3707 for (i = 0; i < 78; i++) err.print_raw("-");
3708 err.cr();
3709 err.print_raw_cr(message);
3710 for (i = 0; i < 78; i++) err.print_raw("=");
3711 err.cr();
3712
3713 char buf[16];
3714 // Prevent process from exiting upon "read error" without consuming all CPU
3715 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3716
3717 return buf[0] == 'y' || buf[0] == 'Y';
3718 }
3719
3720 // Is a (classpath) directory empty?
3721 bool os::dir_is_empty(const char* path) {
3722 DIR *dir = NULL;
3723 struct dirent *ptr;
3724
3725 dir = opendir(path);
3726 if (dir == NULL) return true;
3727
3728 /* Scan the directory */
3729 bool result = true;
3730 while (result && (ptr = readdir(dir)) != NULL) {
3731 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3732 result = false;
3733 }
3734 }
3735 closedir(dir);
3736 return result;
3737 }
3738
3739 // This code originates from JDK's sysOpen and open64_w
3740 // from src/solaris/hpi/src/system_md.c
3741
3742 int os::open(const char *path, int oflag, int mode) {
3743
3744 if (strlen(path) > MAX_PATH - 1) {
3745 errno = ENAMETOOLONG;
3746 return -1;
3747 }
3748 int fd;
3749
3750 fd = ::open64(path, oflag, mode);
3751 if (fd == -1) return -1;
3752
3753 // If the open succeeded, the file might still be a directory.
3754 {
3755 struct stat64 buf64;
3756 int ret = ::fstat64(fd, &buf64);
3757 int st_mode = buf64.st_mode;
3758
3759 if (ret != -1) {
3760 if ((st_mode & S_IFMT) == S_IFDIR) {
3761 errno = EISDIR;
3762 ::close(fd);
3763 return -1;
3764 }
3765 } else {
3766 ::close(fd);
3767 return -1;
3768 }
3769 }
3770
3771 // All file descriptors that are opened in the JVM and not
3772 // specifically destined for a subprocess should have the
3773 // close-on-exec flag set. If we don't set it, then careless 3rd
3774 // party native code might fork and exec without closing all
3775 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3776 // UNIXProcess.c), and this in turn might:
3777 //
3778 // - cause end-of-file to fail to be detected on some file
3779 // descriptors, resulting in mysterious hangs, or
3780 //
3781 // - might cause an fopen in the subprocess to fail on a system
3782 // suffering from bug 1085341.
3783 //
3784 // (Yes, the default setting of the close-on-exec flag is a Unix
3785 // design flaw.)
3786 //
3787 // See:
3788 // 1085341: 32-bit stdio routines should support file descriptors >255
3789 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3790 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3791 #ifdef FD_CLOEXEC
3792 {
3793 int flags = ::fcntl(fd, F_GETFD);
3794 if (flags != -1)
3795 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3796 }
3797 #endif
3798
3799 return fd;
3800 }
3801
3802 // create binary file, rewriting existing file if required
3803 int os::create_binary_file(const char* path, bool rewrite_existing) {
3804 int oflags = O_WRONLY | O_CREAT;
3805 if (!rewrite_existing) {
3806 oflags |= O_EXCL;
3807 }
3808 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3809 }
3810
3811 // return current position of file pointer
3812 jlong os::current_file_offset(int fd) {
3813 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3814 }
3815
3816 // move file pointer to the specified offset
3817 jlong os::seek_to_file_offset(int fd, jlong offset) {
3818 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3819 }
3820
3821 // This code originates from JDK's sysAvailable
3822 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3823
3824 int os::available(int fd, jlong *bytes) {
3825 jlong cur, end;
3826 int mode;
3827 struct stat64 buf64;
3828
3829 if (::fstat64(fd, &buf64) >= 0) {
3830 mode = buf64.st_mode;
3831 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3832 int n;
3833 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3834 *bytes = n;
3835 return 1;
3836 }
3837 }
3838 }
3839 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3840 return 0;
3841 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3842 return 0;
3843 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3844 return 0;
3845 }
3846 *bytes = end - cur;
3847 return 1;
3848 }
3849
3850 // Map a block of memory.
3851 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3852 char *addr, size_t bytes, bool read_only,
3853 bool allow_exec) {
3854 int prot;
3855 int flags = MAP_PRIVATE;
3856
3857 if (read_only) {
3858 prot = PROT_READ;
3859 flags = MAP_SHARED;
3860 } else {
3861 prot = PROT_READ | PROT_WRITE;
3862 flags = MAP_PRIVATE;
3863 }
3864
3865 if (allow_exec) {
3866 prot |= PROT_EXEC;
3867 }
3868
3869 if (addr != NULL) {
3870 flags |= MAP_FIXED;
3871 }
3872
3873 // Allow anonymous mappings if 'fd' is -1.
3874 if (fd == -1) {
3875 flags |= MAP_ANONYMOUS;
3876 }
3877
3878 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3879 fd, file_offset);
3880 if (mapped_address == MAP_FAILED) {
3881 return NULL;
3882 }
3883 return mapped_address;
3884 }
3885
3886 // Remap a block of memory.
3887 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3888 char *addr, size_t bytes, bool read_only,
3889 bool allow_exec) {
3890 // same as map_memory() on this OS
3891 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3892 allow_exec);
3893 }
3894
3895 // Unmap a block of memory.
3896 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3897 return munmap(addr, bytes) == 0;
3898 }
3899
3900 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3901 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3902 // of a thread.
3903 //
3904 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3905 // the fast estimate available on the platform.
3906
3907 jlong os::current_thread_cpu_time() {
3908 // return user + sys since the cost is the same
3909 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3910 assert(n >= 0, "negative CPU time");
3911 return n;
3912 }
3913
3914 jlong os::thread_cpu_time(Thread* thread) {
3915 // consistent with what current_thread_cpu_time() returns
3916 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3917 assert(n >= 0, "negative CPU time");
3918 return n;
3919 }
3920
3921 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3922 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3923 assert(n >= 0, "negative CPU time");
3924 return n;
3925 }
3926
3927 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3928 bool error = false;
3929
3930 jlong sys_time = 0;
3931 jlong user_time = 0;
3932
3933 // Reimplemented using getthrds64().
3934 //
3935 // Works like this:
3936 // For the thread in question, get the kernel thread id. Then get the
3937 // kernel thread statistics using that id.
3938 //
3939 // This only works of course when no pthread scheduling is used,
3940 // i.e. there is a 1:1 relationship to kernel threads.
3941 // On AIX, see AIXTHREAD_SCOPE variable.
3942
3943 pthread_t pthtid = thread->osthread()->pthread_id();
3944
3945 // retrieve kernel thread id for the pthread:
3946 tid64_t tid = 0;
3947 struct __pthrdsinfo pinfo;
3948 // I just love those otherworldly IBM APIs which force me to hand down
3949 // dummy buffers for stuff I dont care for...
3950 char dummy[1];
3951 int dummy_size = sizeof(dummy);
3952 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3953 dummy, &dummy_size) == 0) {
3954 tid = pinfo.__pi_tid;
3955 } else {
3956 tty->print_cr("pthread_getthrds_np failed.");
3957 error = true;
3958 }
3959
3960 // retrieve kernel timing info for that kernel thread
3961 if (!error) {
3962 struct thrdentry64 thrdentry;
3963 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3964 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3965 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3966 } else {
3967 tty->print_cr("pthread_getthrds_np failed.");
3968 error = true;
3969 }
3970 }
3971
3972 if (p_sys_time) {
3973 *p_sys_time = sys_time;
3974 }
3975
3976 if (p_user_time) {
3977 *p_user_time = user_time;
3978 }
3979
3980 if (error) {
3981 return false;
3982 }
3983
3984 return true;
3985 }
3986
3987 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3988 jlong sys_time;
3989 jlong user_time;
3990
3991 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3992 return -1;
3993 }
3994
3995 return user_sys_cpu_time ? sys_time + user_time : user_time;
3996 }
3997
3998 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3999 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4000 info_ptr->may_skip_backward = false; // elapsed time not wall time
4001 info_ptr->may_skip_forward = false; // elapsed time not wall time
4002 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4003 }
4004
4005 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4006 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4007 info_ptr->may_skip_backward = false; // elapsed time not wall time
4008 info_ptr->may_skip_forward = false; // elapsed time not wall time
4009 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4010 }
4011
4012 bool os::is_thread_cpu_time_supported() {
4013 return true;
4014 }
4015
4016 // System loadavg support. Returns -1 if load average cannot be obtained.
4017 // For now just return the system wide load average (no processor sets).
4018 int os::loadavg(double values[], int nelem) {
4019
4020 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4021 guarantee(values, "argument error");
4022
4023 if (os::Aix::on_pase()) {
4024
4025 // AS/400 PASE: use libo4 porting library
4026 double v[3] = { 0.0, 0.0, 0.0 };
4027
4028 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4029 for (int i = 0; i < nelem; i ++) {
4030 values[i] = v[i];
4031 }
4032 return nelem;
4033 } else {
4034 return -1;
4035 }
4036
4037 } else {
4038
4039 // AIX: use libperfstat
4040 libperfstat::cpuinfo_t ci;
4041 if (libperfstat::get_cpuinfo(&ci)) {
4042 for (int i = 0; i < nelem; i++) {
4043 values[i] = ci.loadavg[i];
4044 }
4045 } else {
4046 return -1;
4047 }
4048 return nelem;
4049 }
4050 }
4051
4052 void os::pause() {
4053 char filename[MAX_PATH];
4054 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4055 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4056 } else {
4057 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4058 }
4059
4060 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4061 if (fd != -1) {
4062 struct stat buf;
4063 ::close(fd);
4064 while (::stat(filename, &buf) == 0) {
4065 (void)::poll(NULL, 0, 100);
4066 }
4067 } else {
4068 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4069 }
4070 }
4071
4072 bool os::is_primordial_thread(void) {
4073 if (pthread_self() == (pthread_t)1) {
4074 return true;
4075 } else {
4076 return false;
4077 }
4078 }
4079
4080 // OS recognitions (PASE/AIX, OS level) call this before calling any
4081 // one of Aix::on_pase(), Aix::os_version() static
4082 void os::Aix::initialize_os_info() {
4083
4084 assert(_on_pase == -1 && _os_version == 0, "already called.");
4085
4086 struct utsname uts;
4087 memset(&uts, 0, sizeof(uts));
4088 strcpy(uts.sysname, "?");
4089 if (::uname(&uts) == -1) {
4090 trcVerbose("uname failed (%d)", errno);
4091 guarantee(0, "Could not determine whether we run on AIX or PASE");
4092 } else {
4093 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4094 "node \"%s\" machine \"%s\"\n",
4095 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4096 const int major = atoi(uts.version);
4097 assert(major > 0, "invalid OS version");
4098 const int minor = atoi(uts.release);
4099 assert(minor > 0, "invalid OS release");
4100 _os_version = (major << 24) | (minor << 16);
4101 char ver_str[20] = {0};
4102 char *name_str = "unknown OS";
4103 if (strcmp(uts.sysname, "OS400") == 0) {
4104 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4105 _on_pase = 1;
4106 if (os_version_short() < 0x0504) {
4107 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4108 assert(false, "OS/400 release too old.");
4109 }
4110 name_str = "OS/400 (pase)";
4111 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4112 } else if (strcmp(uts.sysname, "AIX") == 0) {
4113 // We run on AIX. We do not support versions older than AIX 5.3.
4114 _on_pase = 0;
4115 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4116 odmWrapper::determine_os_kernel_version(&_os_version);
4117 if (os_version_short() < 0x0503) {
4118 trcVerbose("AIX release older than AIX 5.3 not supported.");
4119 assert(false, "AIX release too old.");
4120 }
4121 name_str = "AIX";
4122 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4123 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4124 } else {
4125 assert(false, name_str);
4126 }
4127 trcVerbose("We run on %s %s", name_str, ver_str);
4128 }
4129
4130 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4131 } // end: os::Aix::initialize_os_info()
4132
4133 // Scan environment for important settings which might effect the VM.
4134 // Trace out settings. Warn about invalid settings and/or correct them.
4135 //
4136 // Must run after os::Aix::initialue_os_info().
4137 void os::Aix::scan_environment() {
4138
4139 char* p;
4140 int rc;
4141
4142 // Warn explicity if EXTSHM=ON is used. That switch changes how
4143 // System V shared memory behaves. One effect is that page size of
4144 // shared memory cannot be change dynamically, effectivly preventing
4145 // large pages from working.
4146 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4147 // recommendation is (in OSS notes) to switch it off.
4148 p = ::getenv("EXTSHM");
4149 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4150 if (p && strcasecmp(p, "ON") == 0) {
4151 _extshm = 1;
4152 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4153 if (!AllowExtshm) {
4154 // We allow under certain conditions the user to continue. However, we want this
4155 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4156 // that the VM is not able to allocate 64k pages for the heap.
4157 // We do not want to run with reduced performance.
4158 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4159 }
4160 } else {
4161 _extshm = 0;
4162 }
4163
4164 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4165 // Not tested, not supported.
4166 //
4167 // Note that it might be worth the trouble to test and to require it, if only to
4168 // get useful return codes for mprotect.
4169 //
4170 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4171 // exec() ? before loading the libjvm ? ....)
4172 p = ::getenv("XPG_SUS_ENV");
4173 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4174 if (p && strcmp(p, "ON") == 0) {
4175 _xpg_sus_mode = 1;
4176 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4177 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4178 // clobber address ranges. If we ever want to support that, we have to do some
4179 // testing first.
4180 guarantee(false, "XPG_SUS_ENV=ON not supported");
4181 } else {
4182 _xpg_sus_mode = 0;
4183 }
4184
4185 if (os::Aix::on_pase()) {
4186 p = ::getenv("QIBM_MULTI_THREADED");
4187 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4188 }
4189
4190 p = ::getenv("LDR_CNTRL");
4191 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4192 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4193 if (p && ::strstr(p, "TEXTPSIZE")) {
4194 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4195 "you may experience hangs or crashes on OS/400 V7R1.");
4196 }
4197 }
4198
4199 p = ::getenv("AIXTHREAD_GUARDPAGES");
4200 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4201
4202 } // end: os::Aix::scan_environment()
4203
4204 // PASE: initialize the libo4 library (PASE porting library).
4205 void os::Aix::initialize_libo4() {
4206 guarantee(os::Aix::on_pase(), "OS/400 only.");
4207 if (!libo4::init()) {
4208 trcVerbose("libo4 initialization failed.");
4209 assert(false, "libo4 initialization failed");
4210 } else {
4211 trcVerbose("libo4 initialized.");
4212 }
4213 }
4214
4215 // AIX: initialize the libperfstat library.
4216 void os::Aix::initialize_libperfstat() {
4217 assert(os::Aix::on_aix(), "AIX only");
4218 if (!libperfstat::init()) {
4219 trcVerbose("libperfstat initialization failed.");
4220 assert(false, "libperfstat initialization failed");
4221 } else {
4222 trcVerbose("libperfstat initialized.");
4223 }
4224 }
4225
4226 /////////////////////////////////////////////////////////////////////////////
4227 // thread stack
4228
4229 // Get the current stack base from the OS (actually, the pthread library).
4230 // Note: usually not page aligned.
4231 address os::current_stack_base() {
4232 AixMisc::stackbounds_t bounds;
4233 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4234 guarantee(rc, "Unable to retrieve stack bounds.");
4235 return bounds.base;
4236 }
4237
4238 // Get the current stack size from the OS (actually, the pthread library).
4239 // Returned size is such that (base - size) is always aligned to page size.
4240 size_t os::current_stack_size() {
4241 AixMisc::stackbounds_t bounds;
4242 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4243 guarantee(rc, "Unable to retrieve stack bounds.");
4244 // Align the returned stack size such that the stack low address
4245 // is aligned to page size (Note: base is usually not and we do not care).
4246 // We need to do this because caller code will assume stack low address is
4247 // page aligned and will place guard pages without checking.
4248 address low = bounds.base - bounds.size;
4249 address low_aligned = (address)align_up(low, os::vm_page_size());
4250 size_t s = bounds.base - low_aligned;
4251 return s;
4252 }
4253
4254 extern char** environ;
4255
4256 // Run the specified command in a separate process. Return its exit value,
4257 // or -1 on failure (e.g. can't fork a new process).
4258 // Unlike system(), this function can be called from signal handler. It
4259 // doesn't block SIGINT et al.
4260 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4261 char * argv[4] = {"sh", "-c", cmd, NULL};
4262
4263 pid_t pid = fork();
4264
4265 if (pid < 0) {
4266 // fork failed
4267 return -1;
4268
4269 } else if (pid == 0) {
4270 // child process
4271
4272 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4273 execve("/usr/bin/sh", argv, environ);
4274
4275 // execve failed
4276 _exit(-1);
4277
4278 } else {
4279 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4280 // care about the actual exit code, for now.
4281
4282 int status;
4283
4284 // Wait for the child process to exit. This returns immediately if
4285 // the child has already exited. */
4286 while (waitpid(pid, &status, 0) < 0) {
4287 switch (errno) {
4288 case ECHILD: return 0;
4289 case EINTR: break;
4290 default: return -1;
4291 }
4292 }
4293
4294 if (WIFEXITED(status)) {
4295 // The child exited normally; get its exit code.
4296 return WEXITSTATUS(status);
4297 } else if (WIFSIGNALED(status)) {
4298 // The child exited because of a signal.
4299 // The best value to return is 0x80 + signal number,
4300 // because that is what all Unix shells do, and because
4301 // it allows callers to distinguish between process exit and
4302 // process death by signal.
4303 return 0x80 + WTERMSIG(status);
4304 } else {
4305 // Unknown exit code; pass it through.
4306 return status;
4307 }
4308 }
4309 return -1;
4310 }
4311
4312 // Get the default path to the core file
4313 // Returns the length of the string
4314 int os::get_core_path(char* buffer, size_t bufferSize) {
4315 const char* p = get_current_directory(buffer, bufferSize);
4316
4317 if (p == NULL) {
4318 assert(p != NULL, "failed to get current directory");
4319 return 0;
4320 }
4321
4322 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4323 p, current_process_id());
4324
4325 return strlen(buffer);
4326 }
4327
4328 #ifndef PRODUCT
4329 void TestReserveMemorySpecial_test() {
4330 // No tests available for this platform
4331 }
4332 #endif
4333
4334 bool os::start_debugging(char *buf, int buflen) {
4335 int len = (int)strlen(buf);
4336 char *p = &buf[len];
4337
4338 jio_snprintf(p, buflen -len,
4339 "\n\n"
4340 "Do you want to debug the problem?\n\n"
4341 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4342 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4343 "Otherwise, press RETURN to abort...",
4344 os::current_process_id(),
4345 os::current_thread_id(), thread_self());
4346
4347 bool yes = os::message_box("Unexpected Error", buf);
4348
4349 if (yes) {
4350 // yes, user asked VM to launch debugger
4351 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4352
4353 os::fork_and_exec(buf);
4354 yes = false;
4355 }
4356 return yes;
4357 }
4358
4359 static inline time_t get_mtime(const char* filename) {
4360 struct stat st;
4361 int ret = os::stat(filename, &st);
4362 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4363 return st.st_mtime;
4364 }
4365
4366 int os::compare_file_modified_times(const char* file1, const char* file2) {
4367 time_t t1 = get_mtime(file1);
4368 time_t t2 = get_mtime(file2);
4369 return t1 - t2;
4370 }