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 #define DEFAULT_LIBPATH "/lib:/usr/lib"
545 #define EXTENSIONS_DIR "/lib/ext"
546
547 // Buffer that fits several sprintfs.
548 // Note that the space for the trailing null is provided
549 // by the nulls included by the sizeof operator.
550 const size_t bufsize =
551 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
554
555 // sysclasspath, java_home, dll_dir
556 {
557 char *pslash;
558 os::jvm_path(buf, bufsize);
559
560 // Found the full path to libjvm.so.
561 // Now cut the path to <java_home>/jre if we can.
562 pslash = strrchr(buf, '/');
563 if (pslash != NULL) {
564 *pslash = '\0'; // Get rid of /libjvm.so.
565 }
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
569 }
570 Arguments::set_dll_dir(buf);
571
572 if (pslash != NULL) {
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /lib.
576 }
577 }
578 Arguments::set_java_home(buf);
579 if (!set_boot_path('/', ':')) {
580 vm_exit_during_initialization("Failed setting boot class path.", NULL);
581 }
582 }
583
584 // Where to look for native libraries.
585
586 // On Aix we get the user setting of LIBPATH.
587 // Eventually, all the library path setting will be done here.
588 // Get the user setting of LIBPATH.
589 const char *v = ::getenv("LIBPATH");
590 const char *v_colon = ":";
591 if (v == NULL) { v = ""; v_colon = ""; }
592
593 // Concatenate user and invariant part of ld_library_path.
594 // That's +1 for the colon and +1 for the trailing '\0'.
595 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
596 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
597 Arguments::set_library_path(ld_library_path);
598 FREE_C_HEAP_ARRAY(char, ld_library_path);
599
600 // Extensions directories.
601 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
602 Arguments::set_ext_dirs(buf);
603
604 FREE_C_HEAP_ARRAY(char, buf);
605
606 #undef DEFAULT_LIBPATH
607 #undef EXTENSIONS_DIR
608 }
609
610 ////////////////////////////////////////////////////////////////////////////////
611 // breakpoint support
612
613 void os::breakpoint() {
614 BREAKPOINT;
615 }
616
617 extern "C" void breakpoint() {
618 // use debugger to set breakpoint here
619 }
620
621 ////////////////////////////////////////////////////////////////////////////////
622 // signal support
623
624 debug_only(static bool signal_sets_initialized = false);
625 static sigset_t unblocked_sigs, vm_sigs;
626
627 void os::Aix::signal_sets_init() {
628 // Should also have an assertion stating we are still single-threaded.
629 assert(!signal_sets_initialized, "Already initialized");
630 // Fill in signals that are necessarily unblocked for all threads in
631 // the VM. Currently, we unblock the following signals:
632 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
633 // by -Xrs (=ReduceSignalUsage));
634 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
635 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
636 // the dispositions or masks wrt these signals.
637 // Programs embedding the VM that want to use the above signals for their
638 // own purposes must, at this time, use the "-Xrs" option to prevent
639 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
640 // (See bug 4345157, and other related bugs).
641 // In reality, though, unblocking these signals is really a nop, since
642 // these signals are not blocked by default.
643 sigemptyset(&unblocked_sigs);
644 sigaddset(&unblocked_sigs, SIGILL);
645 sigaddset(&unblocked_sigs, SIGSEGV);
646 sigaddset(&unblocked_sigs, SIGBUS);
647 sigaddset(&unblocked_sigs, SIGFPE);
648 sigaddset(&unblocked_sigs, SIGTRAP);
649 sigaddset(&unblocked_sigs, SR_signum);
650
651 if (!ReduceSignalUsage) {
652 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
653 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
654 }
655 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
656 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
657 }
658 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
659 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
660 }
661 }
662 // Fill in signals that are blocked by all but the VM thread.
663 sigemptyset(&vm_sigs);
664 if (!ReduceSignalUsage)
665 sigaddset(&vm_sigs, BREAK_SIGNAL);
666 debug_only(signal_sets_initialized = true);
667 }
668
669 // These are signals that are unblocked while a thread is running Java.
670 // (For some reason, they get blocked by default.)
671 sigset_t* os::Aix::unblocked_signals() {
672 assert(signal_sets_initialized, "Not initialized");
673 return &unblocked_sigs;
674 }
675
676 // These are the signals that are blocked while a (non-VM) thread is
677 // running Java. Only the VM thread handles these signals.
678 sigset_t* os::Aix::vm_signals() {
679 assert(signal_sets_initialized, "Not initialized");
680 return &vm_sigs;
681 }
682
683 void os::Aix::hotspot_sigmask(Thread* thread) {
684
685 //Save caller's signal mask before setting VM signal mask
686 sigset_t caller_sigmask;
687 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
688
689 OSThread* osthread = thread->osthread();
690 osthread->set_caller_sigmask(caller_sigmask);
691
692 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
693
694 if (!ReduceSignalUsage) {
695 if (thread->is_VM_thread()) {
696 // Only the VM thread handles BREAK_SIGNAL ...
697 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
698 } else {
699 // ... all other threads block BREAK_SIGNAL
700 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
701 }
702 }
703 }
704
705 // retrieve memory information.
706 // Returns false if something went wrong;
707 // content of pmi undefined in this case.
708 bool os::Aix::get_meminfo(meminfo_t* pmi) {
709
710 assert(pmi, "get_meminfo: invalid parameter");
711
712 memset(pmi, 0, sizeof(meminfo_t));
713
714 if (os::Aix::on_pase()) {
715 // On PASE, use the libo4 porting library.
716
717 unsigned long long virt_total = 0;
718 unsigned long long real_total = 0;
719 unsigned long long real_free = 0;
720 unsigned long long pgsp_total = 0;
721 unsigned long long pgsp_free = 0;
722 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
723 pmi->virt_total = virt_total;
724 pmi->real_total = real_total;
725 pmi->real_free = real_free;
726 pmi->pgsp_total = pgsp_total;
727 pmi->pgsp_free = pgsp_free;
728 return true;
729 }
730 return false;
731
732 } else {
733
734 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
735 // See:
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
738 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
739 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
740
741 perfstat_memory_total_t psmt;
742 memset (&psmt, '\0', sizeof(psmt));
743 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
744 if (rc == -1) {
745 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
746 assert(0, "perfstat_memory_total() failed");
747 return false;
748 }
749
750 assert(rc == 1, "perfstat_memory_total() - weird return code");
751
752 // excerpt from
753 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
754 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
755 // The fields of perfstat_memory_total_t:
756 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
757 // u_longlong_t real_total Total real memory (in 4 KB pages).
758 // u_longlong_t real_free Free real memory (in 4 KB pages).
759 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
760 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
761
762 pmi->virt_total = psmt.virt_total * 4096;
763 pmi->real_total = psmt.real_total * 4096;
764 pmi->real_free = psmt.real_free * 4096;
765 pmi->pgsp_total = psmt.pgsp_total * 4096;
766 pmi->pgsp_free = psmt.pgsp_free * 4096;
767
768 return true;
769
770 }
771 } // end os::Aix::get_meminfo
772
773 //////////////////////////////////////////////////////////////////////////////
774 // create new thread
775
776 // Thread start routine for all newly created threads
777 static void *thread_native_entry(Thread *thread) {
778
779 // find out my own stack dimensions
780 {
781 // actually, this should do exactly the same as thread->record_stack_base_and_size...
782 thread->set_stack_base(os::current_stack_base());
783 thread->set_stack_size(os::current_stack_size());
784 }
785
786 const pthread_t pthread_id = ::pthread_self();
787 const tid_t kernel_thread_id = ::thread_self();
788
789 LogTarget(Info, os, thread) lt;
790 if (lt.is_enabled()) {
791 address low_address = thread->stack_end();
792 address high_address = thread->stack_base();
793 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
794 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
795 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
796 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
797 }
798
799 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
800 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
801 // tools hook pthread_create(). In this case, we may run into problems establishing
802 // guard pages on those stacks, because the stacks may reside in memory which is not
803 // protectable (shmated).
804 if (thread->stack_base() > ::sbrk(0)) {
805 log_warning(os, thread)("Thread stack not in data segment.");
806 }
807
808 // Try to randomize the cache line index of hot stack frames.
809 // This helps when threads of the same stack traces evict each other's
810 // cache lines. The threads can be either from the same JVM instance, or
811 // from different JVM instances. The benefit is especially true for
812 // processors with hyperthreading technology.
813
814 static int counter = 0;
815 int pid = os::current_process_id();
816 alloca(((pid ^ counter++) & 7) * 128);
817
818 thread->initialize_thread_current();
819
820 OSThread* osthread = thread->osthread();
821
822 // Thread_id is pthread id.
823 osthread->set_thread_id(pthread_id);
824
825 // .. but keep kernel thread id too for diagnostics
826 osthread->set_kernel_thread_id(kernel_thread_id);
827
828 // Initialize signal mask for this thread.
829 os::Aix::hotspot_sigmask(thread);
830
831 // Initialize floating point control register.
832 os::Aix::init_thread_fpu_state();
833
834 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
835
836 // Call one more level start routine.
837 thread->run();
838
839 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
840 os::current_thread_id(), (uintx) kernel_thread_id);
841
842 // If a thread has not deleted itself ("delete this") as part of its
843 // termination sequence, we have to ensure thread-local-storage is
844 // cleared before we actually terminate. No threads should ever be
845 // deleted asynchronously with respect to their termination.
846 if (Thread::current_or_null_safe() != NULL) {
847 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
848 thread->clear_thread_current();
849 }
850
851 return 0;
852 }
853
854 bool os::create_thread(Thread* thread, ThreadType thr_type,
855 size_t req_stack_size) {
856
857 assert(thread->osthread() == NULL, "caller responsible");
858
859 // Allocate the OSThread object.
860 OSThread* osthread = new OSThread(NULL, NULL);
861 if (osthread == NULL) {
862 return false;
863 }
864
865 // Set the correct thread state.
866 osthread->set_thread_type(thr_type);
867
868 // Initial state is ALLOCATED but not INITIALIZED
869 osthread->set_state(ALLOCATED);
870
871 thread->set_osthread(osthread);
872
873 // Init thread attributes.
874 pthread_attr_t attr;
875 pthread_attr_init(&attr);
876 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
877
878 // Make sure we run in 1:1 kernel-user-thread mode.
879 if (os::Aix::on_aix()) {
880 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
881 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
882 }
883
884 // Start in suspended state, and in os::thread_start, wake the thread up.
885 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
886
887 // Calculate stack size if it's not specified by caller.
888 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
889
890 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
891 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
892 // This very much looks like a pthread lib error. As a workaround, increase the stack size
893 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
894 if (stack_size < 4096 * K) {
895 stack_size += 64 * K;
896 }
897
898 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
899 // thread size in attr unchanged. If this is the minimal stack size as set
900 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
901 // guard pages might not fit on the tiny stack created.
902 int ret = pthread_attr_setstacksize(&attr, stack_size);
903 if (ret != 0) {
904 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
905 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
906 stack_size / K);
907 thread->set_osthread(NULL);
908 delete osthread;
909 return false;
910 }
911
912 // Save some cycles and a page by disabling OS guard pages where we have our own
913 // VM guard pages (in java threads). For other threads, keep system default guard
914 // pages in place.
915 if (thr_type == java_thread || thr_type == compiler_thread) {
916 ret = pthread_attr_setguardsize(&attr, 0);
917 }
918
919 pthread_t tid = 0;
920 if (ret == 0) {
921 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
922 }
923
924 if (ret == 0) {
925 char buf[64];
926 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
927 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
928 } else {
929 char buf[64];
930 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
931 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
932 }
933
934 pthread_attr_destroy(&attr);
935
936 if (ret != 0) {
937 // Need to clean up stuff we've allocated so far.
938 thread->set_osthread(NULL);
939 delete osthread;
940 return false;
941 }
942
943 // OSThread::thread_id is the pthread id.
944 osthread->set_thread_id(tid);
945
946 return true;
947 }
948
949 /////////////////////////////////////////////////////////////////////////////
950 // attach existing thread
951
952 // bootstrap the main thread
953 bool os::create_main_thread(JavaThread* thread) {
954 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
955 return create_attached_thread(thread);
956 }
957
958 bool os::create_attached_thread(JavaThread* thread) {
959 #ifdef ASSERT
960 thread->verify_not_published();
961 #endif
962
963 // Allocate the OSThread object
964 OSThread* osthread = new OSThread(NULL, NULL);
965
966 if (osthread == NULL) {
967 return false;
968 }
969
970 const pthread_t pthread_id = ::pthread_self();
971 const tid_t kernel_thread_id = ::thread_self();
972
973 // OSThread::thread_id is the pthread id.
974 osthread->set_thread_id(pthread_id);
975
976 // .. but keep kernel thread id too for diagnostics
977 osthread->set_kernel_thread_id(kernel_thread_id);
978
979 // initialize floating point control register
980 os::Aix::init_thread_fpu_state();
981
982 // Initial thread state is RUNNABLE
983 osthread->set_state(RUNNABLE);
984
985 thread->set_osthread(osthread);
986
987 if (UseNUMA) {
988 int lgrp_id = os::numa_get_group_id();
989 if (lgrp_id != -1) {
990 thread->set_lgrp_id(lgrp_id);
991 }
992 }
993
994 // initialize signal mask for this thread
995 // and save the caller's signal mask
996 os::Aix::hotspot_sigmask(thread);
997
998 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
999 os::current_thread_id(), (uintx) kernel_thread_id);
1000
1001 return true;
1002 }
1003
1004 void os::pd_start_thread(Thread* thread) {
1005 int status = pthread_continue_np(thread->osthread()->pthread_id());
1006 assert(status == 0, "thr_continue failed");
1007 }
1008
1009 // Free OS resources related to the OSThread
1010 void os::free_thread(OSThread* osthread) {
1011 assert(osthread != NULL, "osthread not set");
1012
1013 // We are told to free resources of the argument thread,
1014 // but we can only really operate on the current thread.
1015 assert(Thread::current()->osthread() == osthread,
1016 "os::free_thread but not current thread");
1017
1018 // Restore caller's signal mask
1019 sigset_t sigmask = osthread->caller_sigmask();
1020 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1021
1022 delete osthread;
1023 }
1024
1025 ////////////////////////////////////////////////////////////////////////////////
1026 // time support
1027
1028 // Time since start-up in seconds to a fine granularity.
1029 // Used by VMSelfDestructTimer and the MemProfiler.
1030 double os::elapsedTime() {
1031 return (double)(os::elapsed_counter()) * 0.000001;
1032 }
1033
1034 jlong os::elapsed_counter() {
1035 timeval time;
1036 int status = gettimeofday(&time, NULL);
1037 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1038 }
1039
1040 jlong os::elapsed_frequency() {
1041 return (1000 * 1000);
1042 }
1043
1044 bool os::supports_vtime() { return true; }
1045 bool os::enable_vtime() { return false; }
1046 bool os::vtime_enabled() { return false; }
1047
1048 double os::elapsedVTime() {
1049 struct rusage usage;
1050 int retval = getrusage(RUSAGE_THREAD, &usage);
1051 if (retval == 0) {
1052 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1053 } else {
1054 // better than nothing, but not much
1055 return elapsedTime();
1056 }
1057 }
1058
1059 jlong os::javaTimeMillis() {
1060 timeval time;
1061 int status = gettimeofday(&time, NULL);
1062 assert(status != -1, "aix error at gettimeofday()");
1063 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1064 }
1065
1066 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1067 timeval time;
1068 int status = gettimeofday(&time, NULL);
1069 assert(status != -1, "aix error at gettimeofday()");
1070 seconds = jlong(time.tv_sec);
1071 nanos = jlong(time.tv_usec) * 1000;
1072 }
1073
1074 // We use mread_real_time here.
1075 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1076 // it has to be converted to real time. AIX documentations suggests to do
1077 // this unconditionally, so we do it.
1078 //
1079 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1080 //
1081 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1082 // conversion is necessary. However, mread_real_time will not return
1083 // monotonic results but merely matches read_real_time. So we need a tweak
1084 // to ensure monotonic results.
1085 //
1086 // For PASE no public documentation exists, just word by IBM
1087 jlong os::javaTimeNanos() {
1088 timebasestruct_t time;
1089 int rc = mread_real_time(&time, TIMEBASE_SZ);
1090 if (os::Aix::on_pase()) {
1091 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1092 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1093 jlong prev = max_real_time;
1094 if (now <= prev) {
1095 return prev; // same or retrograde time;
1096 }
1097 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1098 assert(obsv >= prev, "invariant"); // Monotonicity
1099 // If the CAS succeeded then we're done and return "now".
1100 // If the CAS failed and the observed value "obsv" is >= now then
1101 // we should return "obsv". If the CAS failed and now > obsv > prv then
1102 // some other thread raced this thread and installed a new value, in which case
1103 // we could either (a) retry the entire operation, (b) retry trying to install now
1104 // or (c) just return obsv. We use (c). No loop is required although in some cases
1105 // we might discard a higher "now" value in deference to a slightly lower but freshly
1106 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1107 // to (a) or (b) -- and greatly reduces coherence traffic.
1108 // We might also condition (c) on the magnitude of the delta between obsv and now.
1109 // Avoiding excessive CAS operations to hot RW locations is critical.
1110 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1111 return (prev == obsv) ? now : obsv;
1112 } else {
1113 if (rc != RTC_POWER) {
1114 rc = time_base_to_time(&time, TIMEBASE_SZ);
1115 assert(rc != -1, "error calling time_base_to_time()");
1116 }
1117 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1118 }
1119 }
1120
1121 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1122 info_ptr->max_value = ALL_64_BITS;
1123 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1124 info_ptr->may_skip_backward = false;
1125 info_ptr->may_skip_forward = false;
1126 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1127 }
1128
1129 // Return the real, user, and system times in seconds from an
1130 // arbitrary fixed point in the past.
1131 bool os::getTimesSecs(double* process_real_time,
1132 double* process_user_time,
1133 double* process_system_time) {
1134 struct tms ticks;
1135 clock_t real_ticks = times(&ticks);
1136
1137 if (real_ticks == (clock_t) (-1)) {
1138 return false;
1139 } else {
1140 double ticks_per_second = (double) clock_tics_per_sec;
1141 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1142 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1143 *process_real_time = ((double) real_ticks) / ticks_per_second;
1144
1145 return true;
1146 }
1147 }
1148
1149 char * os::local_time_string(char *buf, size_t buflen) {
1150 struct tm t;
1151 time_t long_time;
1152 time(&long_time);
1153 localtime_r(&long_time, &t);
1154 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1155 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1156 t.tm_hour, t.tm_min, t.tm_sec);
1157 return buf;
1158 }
1159
1160 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1161 return localtime_r(clock, res);
1162 }
1163
1164 ////////////////////////////////////////////////////////////////////////////////
1165 // runtime exit support
1166
1167 // Note: os::shutdown() might be called very early during initialization, or
1168 // called from signal handler. Before adding something to os::shutdown(), make
1169 // sure it is async-safe and can handle partially initialized VM.
1170 void os::shutdown() {
1171
1172 // allow PerfMemory to attempt cleanup of any persistent resources
1173 perfMemory_exit();
1174
1175 // needs to remove object in file system
1176 AttachListener::abort();
1177
1178 // flush buffered output, finish log files
1179 ostream_abort();
1180
1181 // Check for abort hook
1182 abort_hook_t abort_hook = Arguments::abort_hook();
1183 if (abort_hook != NULL) {
1184 abort_hook();
1185 }
1186 }
1187
1188 // Note: os::abort() might be called very early during initialization, or
1189 // called from signal handler. Before adding something to os::abort(), make
1190 // sure it is async-safe and can handle partially initialized VM.
1191 void os::abort(bool dump_core, void* siginfo, const void* context) {
1192 os::shutdown();
1193 if (dump_core) {
1194 #ifndef PRODUCT
1195 fdStream out(defaultStream::output_fd());
1196 out.print_raw("Current thread is ");
1197 char buf[16];
1198 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1199 out.print_raw_cr(buf);
1200 out.print_raw_cr("Dumping core ...");
1201 #endif
1202 ::abort(); // dump core
1203 }
1204
1205 ::exit(1);
1206 }
1207
1208 // Die immediately, no exit hook, no abort hook, no cleanup.
1209 void os::die() {
1210 ::abort();
1211 }
1212
1213 intx os::current_thread_id() {
1214 return (intx)pthread_self();
1215 }
1216
1217 int os::current_process_id() {
1218 return getpid();
1219 }
1220
1221 // DLL functions
1222
1223 const char* os::dll_file_extension() { return ".so"; }
1224
1225 // This must be hard coded because it's the system's temporary
1226 // directory not the java application's temp directory, ala java.io.tmpdir.
1227 const char* os::get_temp_directory() { return "/tmp"; }
1228
1229 // Check if addr is inside libjvm.so.
1230 bool os::address_is_in_vm(address addr) {
1231
1232 // Input could be a real pc or a function pointer literal. The latter
1233 // would be a function descriptor residing in the data segment of a module.
1234 loaded_module_t lm;
1235 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1236 return lm.is_in_vm;
1237 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1238 return lm.is_in_vm;
1239 } else {
1240 return false;
1241 }
1242
1243 }
1244
1245 // Resolve an AIX function descriptor literal to a code pointer.
1246 // If the input is a valid code pointer to a text segment of a loaded module,
1247 // it is returned unchanged.
1248 // If the input is a valid AIX function descriptor, it is resolved to the
1249 // code entry point.
1250 // If the input is neither a valid function descriptor nor a valid code pointer,
1251 // NULL is returned.
1252 static address resolve_function_descriptor_to_code_pointer(address p) {
1253
1254 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1255 // It is a real code pointer.
1256 return p;
1257 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1258 // Pointer to data segment, potential function descriptor.
1259 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1260 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1261 // It is a function descriptor.
1262 return code_entry;
1263 }
1264 }
1265
1266 return NULL;
1267 }
1268
1269 bool os::dll_address_to_function_name(address addr, char *buf,
1270 int buflen, int *offset,
1271 bool demangle) {
1272 if (offset) {
1273 *offset = -1;
1274 }
1275 // Buf is not optional, but offset is optional.
1276 assert(buf != NULL, "sanity check");
1277 buf[0] = '\0';
1278
1279 // Resolve function ptr literals first.
1280 addr = resolve_function_descriptor_to_code_pointer(addr);
1281 if (!addr) {
1282 return false;
1283 }
1284
1285 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1286 }
1287
1288 bool os::dll_address_to_library_name(address addr, char* buf,
1289 int buflen, int* offset) {
1290 if (offset) {
1291 *offset = -1;
1292 }
1293 // Buf is not optional, but offset is optional.
1294 assert(buf != NULL, "sanity check");
1295 buf[0] = '\0';
1296
1297 // Resolve function ptr literals first.
1298 addr = resolve_function_descriptor_to_code_pointer(addr);
1299 if (!addr) {
1300 return false;
1301 }
1302
1303 return AixSymbols::get_module_name(addr, buf, buflen);
1304 }
1305
1306 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1307 // for the same architecture as Hotspot is running on.
1308 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1309
1310 if (ebuf && ebuflen > 0) {
1311 ebuf[0] = '\0';
1312 ebuf[ebuflen - 1] = '\0';
1313 }
1314
1315 if (!filename || strlen(filename) == 0) {
1316 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1317 return NULL;
1318 }
1319
1320 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1321 void * result= ::dlopen(filename, RTLD_LAZY);
1322 if (result != NULL) {
1323 // Reload dll cache. Don't do this in signal handling.
1324 LoadedLibraries::reload();
1325 return result;
1326 } else {
1327 // error analysis when dlopen fails
1328 const char* const error_report = ::dlerror();
1329 if (error_report && ebuf && ebuflen > 0) {
1330 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1331 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1332 }
1333 }
1334 return NULL;
1335 }
1336
1337 void* os::dll_lookup(void* handle, const char* name) {
1338 void* res = dlsym(handle, name);
1339 return res;
1340 }
1341
1342 void* os::get_default_process_handle() {
1343 return (void*)::dlopen(NULL, RTLD_LAZY);
1344 }
1345
1346 void os::print_dll_info(outputStream *st) {
1347 st->print_cr("Dynamic libraries:");
1348 LoadedLibraries::print(st);
1349 }
1350
1351 void os::get_summary_os_info(char* buf, size_t buflen) {
1352 // There might be something more readable than uname results for AIX.
1353 struct utsname name;
1354 uname(&name);
1355 snprintf(buf, buflen, "%s %s", name.release, name.version);
1356 }
1357
1358 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1359 // Not yet implemented.
1360 return 0;
1361 }
1362
1363 void os::print_os_info_brief(outputStream* st) {
1364 uint32_t ver = os::Aix::os_version();
1365 st->print_cr("AIX kernel version %u.%u.%u.%u",
1366 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1367
1368 os::Posix::print_uname_info(st);
1369
1370 // Linux uses print_libversion_info(st); here.
1371 }
1372
1373 void os::print_os_info(outputStream* st) {
1374 st->print("OS:");
1375
1376 st->print("uname:");
1377 struct utsname name;
1378 uname(&name);
1379 st->print(name.sysname); st->print(" ");
1380 st->print(name.nodename); st->print(" ");
1381 st->print(name.release); st->print(" ");
1382 st->print(name.version); st->print(" ");
1383 st->print(name.machine);
1384 st->cr();
1385
1386 uint32_t ver = os::Aix::os_version();
1387 st->print_cr("AIX kernel version %u.%u.%u.%u",
1388 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1389
1390 os::Posix::print_rlimit_info(st);
1391
1392 // load average
1393 st->print("load average:");
1394 double loadavg[3] = {-1.L, -1.L, -1.L};
1395 os::loadavg(loadavg, 3);
1396 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1397 st->cr();
1398
1399 // print wpar info
1400 libperfstat::wparinfo_t wi;
1401 if (libperfstat::get_wparinfo(&wi)) {
1402 st->print_cr("wpar info");
1403 st->print_cr("name: %s", wi.name);
1404 st->print_cr("id: %d", wi.wpar_id);
1405 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1406 }
1407
1408 // print partition info
1409 libperfstat::partitioninfo_t pi;
1410 if (libperfstat::get_partitioninfo(&pi)) {
1411 st->print_cr("partition info");
1412 st->print_cr(" name: %s", pi.name);
1413 }
1414
1415 }
1416
1417 void os::print_memory_info(outputStream* st) {
1418
1419 st->print_cr("Memory:");
1420
1421 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1422 describe_pagesize(g_multipage_support.pagesize));
1423 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1424 describe_pagesize(g_multipage_support.datapsize));
1425 st->print_cr(" Text page size: %s",
1426 describe_pagesize(g_multipage_support.textpsize));
1427 st->print_cr(" Thread stack page size (pthread): %s",
1428 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1429 st->print_cr(" Default shared memory page size: %s",
1430 describe_pagesize(g_multipage_support.shmpsize));
1431 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1432 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1433 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1434 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1435 st->print_cr(" Multipage error: %d",
1436 g_multipage_support.error);
1437 st->cr();
1438 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1439
1440 // print out LDR_CNTRL because it affects the default page sizes
1441 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1442 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1443
1444 // Print out EXTSHM because it is an unsupported setting.
1445 const char* const extshm = ::getenv("EXTSHM");
1446 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1447 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1448 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1449 }
1450
1451 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1452 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1453 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1454 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1455 st->cr();
1456
1457 os::Aix::meminfo_t mi;
1458 if (os::Aix::get_meminfo(&mi)) {
1459 if (os::Aix::on_aix()) {
1460 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1461 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1462 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1463 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1464 } else {
1465 // PASE - Numbers are result of QWCRSSTS; they mean:
1466 // real_total: Sum of all system pools
1467 // real_free: always 0
1468 // pgsp_total: we take the size of the system ASP
1469 // pgsp_free: size of system ASP times percentage of system ASP unused
1470 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1471 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1472 st->print_cr("%% system asp used : %.2f",
1473 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1474 }
1475 }
1476 st->cr();
1477
1478 // Print program break.
1479 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1480 address brk_now = (address)::sbrk(0);
1481 if (brk_now != (address)-1) {
1482 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1483 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1484 }
1485 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1486 st->cr();
1487
1488 // Print segments allocated with os::reserve_memory.
1489 st->print_cr("internal virtual memory regions used by vm:");
1490 vmembk_print_on(st);
1491 }
1492
1493 // Get a string for the cpuinfo that is a summary of the cpu type
1494 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1495 // read _system_configuration.version
1496 switch (_system_configuration.version) {
1497 case PV_8:
1498 strncpy(buf, "Power PC 8", buflen);
1499 break;
1500 case PV_7:
1501 strncpy(buf, "Power PC 7", buflen);
1502 break;
1503 case PV_6_1:
1504 strncpy(buf, "Power PC 6 DD1.x", buflen);
1505 break;
1506 case PV_6:
1507 strncpy(buf, "Power PC 6", buflen);
1508 break;
1509 case PV_5:
1510 strncpy(buf, "Power PC 5", buflen);
1511 break;
1512 case PV_5_2:
1513 strncpy(buf, "Power PC 5_2", buflen);
1514 break;
1515 case PV_5_3:
1516 strncpy(buf, "Power PC 5_3", buflen);
1517 break;
1518 case PV_5_Compat:
1519 strncpy(buf, "PV_5_Compat", buflen);
1520 break;
1521 case PV_6_Compat:
1522 strncpy(buf, "PV_6_Compat", buflen);
1523 break;
1524 case PV_7_Compat:
1525 strncpy(buf, "PV_7_Compat", buflen);
1526 break;
1527 case PV_8_Compat:
1528 strncpy(buf, "PV_8_Compat", buflen);
1529 break;
1530 default:
1531 strncpy(buf, "unknown", buflen);
1532 }
1533 }
1534
1535 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1536 // Nothing to do beyond of what os::print_cpu_info() does.
1537 }
1538
1539 static void print_signal_handler(outputStream* st, int sig,
1540 char* buf, size_t buflen);
1541
1542 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1543 st->print_cr("Signal Handlers:");
1544 print_signal_handler(st, SIGSEGV, buf, buflen);
1545 print_signal_handler(st, SIGBUS , buf, buflen);
1546 print_signal_handler(st, SIGFPE , buf, buflen);
1547 print_signal_handler(st, SIGPIPE, buf, buflen);
1548 print_signal_handler(st, SIGXFSZ, buf, buflen);
1549 print_signal_handler(st, SIGILL , buf, buflen);
1550 print_signal_handler(st, SR_signum, buf, buflen);
1551 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1552 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1553 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1554 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1555 print_signal_handler(st, SIGTRAP, buf, buflen);
1556 // We also want to know if someone else adds a SIGDANGER handler because
1557 // that will interfere with OOM killling.
1558 print_signal_handler(st, SIGDANGER, buf, buflen);
1559 }
1560
1561 static char saved_jvm_path[MAXPATHLEN] = {0};
1562
1563 // Find the full path to the current module, libjvm.so.
1564 void os::jvm_path(char *buf, jint buflen) {
1565 // Error checking.
1566 if (buflen < MAXPATHLEN) {
1567 assert(false, "must use a large-enough buffer");
1568 buf[0] = '\0';
1569 return;
1570 }
1571 // Lazy resolve the path to current module.
1572 if (saved_jvm_path[0] != 0) {
1573 strcpy(buf, saved_jvm_path);
1574 return;
1575 }
1576
1577 Dl_info dlinfo;
1578 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1579 assert(ret != 0, "cannot locate libjvm");
1580 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1581 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1582
1583 if (Arguments::sun_java_launcher_is_altjvm()) {
1584 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1585 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1586 // If "/jre/lib/" appears at the right place in the string, then
1587 // assume we are installed in a JDK and we're done. Otherwise, check
1588 // for a JAVA_HOME environment variable and fix up the path so it
1589 // looks like libjvm.so is installed there (append a fake suffix
1590 // hotspot/libjvm.so).
1591 const char *p = buf + strlen(buf) - 1;
1592 for (int count = 0; p > buf && count < 4; ++count) {
1593 for (--p; p > buf && *p != '/'; --p)
1594 /* empty */ ;
1595 }
1596
1597 if (strncmp(p, "/jre/lib/", 9) != 0) {
1598 // Look for JAVA_HOME in the environment.
1599 char* java_home_var = ::getenv("JAVA_HOME");
1600 if (java_home_var != NULL && java_home_var[0] != 0) {
1601 char* jrelib_p;
1602 int len;
1603
1604 // Check the current module name "libjvm.so".
1605 p = strrchr(buf, '/');
1606 if (p == NULL) {
1607 return;
1608 }
1609 assert(strstr(p, "/libjvm") == p, "invalid library name");
1610
1611 rp = os::Posix::realpath(java_home_var, buf, buflen);
1612 if (rp == NULL) {
1613 return;
1614 }
1615
1616 // determine if this is a legacy image or modules image
1617 // modules image doesn't have "jre" subdirectory
1618 len = strlen(buf);
1619 assert(len < buflen, "Ran out of buffer room");
1620 jrelib_p = buf + len;
1621 snprintf(jrelib_p, buflen-len, "/jre/lib");
1622 if (0 != access(buf, F_OK)) {
1623 snprintf(jrelib_p, buflen-len, "/lib");
1624 }
1625
1626 if (0 == access(buf, F_OK)) {
1627 // Use current module name "libjvm.so"
1628 len = strlen(buf);
1629 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1630 } else {
1631 // Go back to path of .so
1632 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1633 if (rp == NULL) {
1634 return;
1635 }
1636 }
1637 }
1638 }
1639 }
1640
1641 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1642 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1643 }
1644
1645 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1646 // no prefix required, not even "_"
1647 }
1648
1649 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1650 // no suffix required
1651 }
1652
1653 ////////////////////////////////////////////////////////////////////////////////
1654 // sun.misc.Signal support
1655
1656 static volatile jint sigint_count = 0;
1657
1658 static void
1659 UserHandler(int sig, void *siginfo, void *context) {
1660 // 4511530 - sem_post is serialized and handled by the manager thread. When
1661 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1662 // don't want to flood the manager thread with sem_post requests.
1663 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1664 return;
1665
1666 // Ctrl-C is pressed during error reporting, likely because the error
1667 // handler fails to abort. Let VM die immediately.
1668 if (sig == SIGINT && VMError::is_error_reported()) {
1669 os::die();
1670 }
1671
1672 os::signal_notify(sig);
1673 }
1674
1675 void* os::user_handler() {
1676 return CAST_FROM_FN_PTR(void*, UserHandler);
1677 }
1678
1679 extern "C" {
1680 typedef void (*sa_handler_t)(int);
1681 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1682 }
1683
1684 void* os::signal(int signal_number, void* handler) {
1685 struct sigaction sigAct, oldSigAct;
1686
1687 sigfillset(&(sigAct.sa_mask));
1688
1689 // Do not block out synchronous signals in the signal handler.
1690 // Blocking synchronous signals only makes sense if you can really
1691 // be sure that those signals won't happen during signal handling,
1692 // when the blocking applies. Normal signal handlers are lean and
1693 // do not cause signals. But our signal handlers tend to be "risky"
1694 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1695 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1696 // by a SIGILL, which was blocked due to the signal mask. The process
1697 // just hung forever. Better to crash from a secondary signal than to hang.
1698 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1699 sigdelset(&(sigAct.sa_mask), SIGBUS);
1700 sigdelset(&(sigAct.sa_mask), SIGILL);
1701 sigdelset(&(sigAct.sa_mask), SIGFPE);
1702 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1703
1704 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1705
1706 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1707
1708 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1709 // -1 means registration failed
1710 return (void *)-1;
1711 }
1712
1713 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1714 }
1715
1716 void os::signal_raise(int signal_number) {
1717 ::raise(signal_number);
1718 }
1719
1720 //
1721 // The following code is moved from os.cpp for making this
1722 // code platform specific, which it is by its very nature.
1723 //
1724
1725 // Will be modified when max signal is changed to be dynamic
1726 int os::sigexitnum_pd() {
1727 return NSIG;
1728 }
1729
1730 // a counter for each possible signal value
1731 static volatile jint pending_signals[NSIG+1] = { 0 };
1732
1733 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1734 // On AIX, we use sem_init(), sem_post(), sem_wait()
1735 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1736 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1737 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1738 // on AIX, msem_..() calls are suspected of causing problems.
1739 static sem_t sig_sem;
1740 static msemaphore* p_sig_msem = 0;
1741
1742 static void local_sem_init() {
1743 if (os::Aix::on_aix()) {
1744 int rc = ::sem_init(&sig_sem, 0, 0);
1745 guarantee(rc != -1, "sem_init failed");
1746 } else {
1747 // Memory semaphores must live in shared mem.
1748 guarantee0(p_sig_msem == NULL);
1749 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1750 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1751 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1752 }
1753 }
1754
1755 static void local_sem_post() {
1756 static bool warn_only_once = false;
1757 if (os::Aix::on_aix()) {
1758 int rc = ::sem_post(&sig_sem);
1759 if (rc == -1 && !warn_only_once) {
1760 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1761 warn_only_once = true;
1762 }
1763 } else {
1764 guarantee0(p_sig_msem != NULL);
1765 int rc = ::msem_unlock(p_sig_msem, 0);
1766 if (rc == -1 && !warn_only_once) {
1767 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1768 warn_only_once = true;
1769 }
1770 }
1771 }
1772
1773 static void local_sem_wait() {
1774 static bool warn_only_once = false;
1775 if (os::Aix::on_aix()) {
1776 int rc = ::sem_wait(&sig_sem);
1777 if (rc == -1 && !warn_only_once) {
1778 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1779 warn_only_once = true;
1780 }
1781 } else {
1782 guarantee0(p_sig_msem != NULL); // must init before use
1783 int rc = ::msem_lock(p_sig_msem, 0);
1784 if (rc == -1 && !warn_only_once) {
1785 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1786 warn_only_once = true;
1787 }
1788 }
1789 }
1790
1791 static void jdk_misc_signal_init() {
1792 // Initialize signal structures
1793 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1794
1795 // Initialize signal semaphore
1796 local_sem_init();
1797 }
1798
1799 void os::signal_notify(int sig) {
1800 Atomic::inc(&pending_signals[sig]);
1801 local_sem_post();
1802 }
1803
1804 static int check_pending_signals() {
1805 Atomic::store(0, &sigint_count);
1806 for (;;) {
1807 for (int i = 0; i < NSIG + 1; i++) {
1808 jint n = pending_signals[i];
1809 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1810 return i;
1811 }
1812 }
1813 JavaThread *thread = JavaThread::current();
1814 ThreadBlockInVM tbivm(thread);
1815
1816 bool threadIsSuspended;
1817 do {
1818 thread->set_suspend_equivalent();
1819 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1820
1821 local_sem_wait();
1822
1823 // were we externally suspended while we were waiting?
1824 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1825 if (threadIsSuspended) {
1826 //
1827 // The semaphore has been incremented, but while we were waiting
1828 // another thread suspended us. We don't want to continue running
1829 // while suspended because that would surprise the thread that
1830 // suspended us.
1831 //
1832
1833 local_sem_post();
1834
1835 thread->java_suspend_self();
1836 }
1837 } while (threadIsSuspended);
1838 }
1839 }
1840
1841 int os::signal_wait() {
1842 return check_pending_signals();
1843 }
1844
1845 ////////////////////////////////////////////////////////////////////////////////
1846 // Virtual Memory
1847
1848 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1849
1850 #define VMEM_MAPPED 1
1851 #define VMEM_SHMATED 2
1852
1853 struct vmembk_t {
1854 int type; // 1 - mmap, 2 - shmat
1855 char* addr;
1856 size_t size; // Real size, may be larger than usersize.
1857 size_t pagesize; // page size of area
1858 vmembk_t* next;
1859
1860 bool contains_addr(char* p) const {
1861 return p >= addr && p < (addr + size);
1862 }
1863
1864 bool contains_range(char* p, size_t s) const {
1865 return contains_addr(p) && contains_addr(p + s - 1);
1866 }
1867
1868 void print_on(outputStream* os) const {
1869 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1870 " bytes, %d %s pages), %s",
1871 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1872 (type == VMEM_SHMATED ? "shmat" : "mmap")
1873 );
1874 }
1875
1876 // Check that range is a sub range of memory block (or equal to memory block);
1877 // also check that range is fully page aligned to the page size if the block.
1878 void assert_is_valid_subrange(char* p, size_t s) const {
1879 if (!contains_range(p, s)) {
1880 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1881 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1882 p, p + s, addr, addr + size);
1883 guarantee0(false);
1884 }
1885 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1886 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1887 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1888 guarantee0(false);
1889 }
1890 }
1891 };
1892
1893 static struct {
1894 vmembk_t* first;
1895 MiscUtils::CritSect cs;
1896 } vmem;
1897
1898 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1899 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1900 assert0(p);
1901 if (p) {
1902 MiscUtils::AutoCritSect lck(&vmem.cs);
1903 p->addr = addr; p->size = size;
1904 p->pagesize = pagesize;
1905 p->type = type;
1906 p->next = vmem.first;
1907 vmem.first = p;
1908 }
1909 }
1910
1911 static vmembk_t* vmembk_find(char* addr) {
1912 MiscUtils::AutoCritSect lck(&vmem.cs);
1913 for (vmembk_t* p = vmem.first; p; p = p->next) {
1914 if (p->addr <= addr && (p->addr + p->size) > addr) {
1915 return p;
1916 }
1917 }
1918 return NULL;
1919 }
1920
1921 static void vmembk_remove(vmembk_t* p0) {
1922 MiscUtils::AutoCritSect lck(&vmem.cs);
1923 assert0(p0);
1924 assert0(vmem.first); // List should not be empty.
1925 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1926 if (*pp == p0) {
1927 *pp = p0->next;
1928 ::free(p0);
1929 return;
1930 }
1931 }
1932 assert0(false); // Not found?
1933 }
1934
1935 static void vmembk_print_on(outputStream* os) {
1936 MiscUtils::AutoCritSect lck(&vmem.cs);
1937 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1938 vmi->print_on(os);
1939 os->cr();
1940 }
1941 }
1942
1943 // Reserve and attach a section of System V memory.
1944 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1945 // address. Failing that, it will attach the memory anywhere.
1946 // If <requested_addr> is NULL, function will attach the memory anywhere.
1947 //
1948 // <alignment_hint> is being ignored by this function. It is very probable however that the
1949 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1950 // Should this be not enogh, we can put more work into it.
1951 static char* reserve_shmated_memory (
1952 size_t bytes,
1953 char* requested_addr,
1954 size_t alignment_hint) {
1955
1956 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1957 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1958 bytes, requested_addr, alignment_hint);
1959
1960 // Either give me wish address or wish alignment but not both.
1961 assert0(!(requested_addr != NULL && alignment_hint != 0));
1962
1963 // We must prevent anyone from attaching too close to the
1964 // BRK because that may cause malloc OOM.
1965 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1966 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1967 "Will attach anywhere.", requested_addr);
1968 // Act like the OS refused to attach there.
1969 requested_addr = NULL;
1970 }
1971
1972 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1973 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1974 if (os::Aix::on_pase_V5R4_or_older()) {
1975 ShouldNotReachHere();
1976 }
1977
1978 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1979 const size_t size = align_up(bytes, 64*K);
1980
1981 // Reserve the shared segment.
1982 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1983 if (shmid == -1) {
1984 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1985 return NULL;
1986 }
1987
1988 // Important note:
1989 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1990 // We must right after attaching it remove it from the system. System V shm segments are global and
1991 // survive the process.
1992 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1993
1994 struct shmid_ds shmbuf;
1995 memset(&shmbuf, 0, sizeof(shmbuf));
1996 shmbuf.shm_pagesize = 64*K;
1997 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1998 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1999 size / (64*K), errno);
2000 // I want to know if this ever happens.
2001 assert(false, "failed to set page size for shmat");
2002 }
2003
2004 // Now attach the shared segment.
2005 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2006 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2007 // were not a segment boundary.
2008 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2009 const int errno_shmat = errno;
2010
2011 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2012 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2013 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2014 assert(false, "failed to remove shared memory segment!");
2015 }
2016
2017 // Handle shmat error. If we failed to attach, just return.
2018 if (addr == (char*)-1) {
2019 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2020 return NULL;
2021 }
2022
2023 // Just for info: query the real page size. In case setting the page size did not
2024 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2025 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2026 if (real_pagesize != shmbuf.shm_pagesize) {
2027 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2028 }
2029
2030 if (addr) {
2031 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2032 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2033 } else {
2034 if (requested_addr != NULL) {
2035 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2036 } else {
2037 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2038 }
2039 }
2040
2041 // book-keeping
2042 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2043 assert0(is_aligned_to(addr, os::vm_page_size()));
2044
2045 return addr;
2046 }
2047
2048 static bool release_shmated_memory(char* addr, size_t size) {
2049
2050 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2051 addr, addr + size - 1);
2052
2053 bool rc = false;
2054
2055 // TODO: is there a way to verify shm size without doing bookkeeping?
2056 if (::shmdt(addr) != 0) {
2057 trcVerbose("error (%d).", errno);
2058 } else {
2059 trcVerbose("ok.");
2060 rc = true;
2061 }
2062 return rc;
2063 }
2064
2065 static bool uncommit_shmated_memory(char* addr, size_t size) {
2066 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2067 addr, addr + size - 1);
2068
2069 const bool rc = my_disclaim64(addr, size);
2070
2071 if (!rc) {
2072 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2073 return false;
2074 }
2075 return true;
2076 }
2077
2078 //////////////////////////////// mmap-based routines /////////////////////////////////
2079
2080 // Reserve memory via mmap.
2081 // If <requested_addr> is given, an attempt is made to attach at the given address.
2082 // Failing that, memory is allocated at any address.
2083 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2084 // allocate at an address aligned with the given alignment. Failing that, memory
2085 // is aligned anywhere.
2086 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2087 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2088 "alignment_hint " UINTX_FORMAT "...",
2089 bytes, requested_addr, alignment_hint);
2090
2091 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2092 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2093 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2094 return NULL;
2095 }
2096
2097 // We must prevent anyone from attaching too close to the
2098 // BRK because that may cause malloc OOM.
2099 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2100 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2101 "Will attach anywhere.", requested_addr);
2102 // Act like the OS refused to attach there.
2103 requested_addr = NULL;
2104 }
2105
2106 // Specify one or the other but not both.
2107 assert0(!(requested_addr != NULL && alignment_hint > 0));
2108
2109 // In 64K mode, we claim the global page size (os::vm_page_size())
2110 // is 64K. This is one of the few points where that illusion may
2111 // break, because mmap() will always return memory aligned to 4K. So
2112 // we must ensure we only ever return memory aligned to 64k.
2113 if (alignment_hint) {
2114 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2115 } else {
2116 alignment_hint = os::vm_page_size();
2117 }
2118
2119 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2120 const size_t size = align_up(bytes, os::vm_page_size());
2121
2122 // alignment: Allocate memory large enough to include an aligned range of the right size and
2123 // cut off the leading and trailing waste pages.
2124 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2125 const size_t extra_size = size + alignment_hint;
2126
2127 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2128 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2129 int flags = MAP_ANONYMOUS | MAP_SHARED;
2130
2131 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2132 // it means if wishaddress is given but MAP_FIXED is not set.
2133 //
2134 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2135 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2136 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2137 // get clobbered.
2138 if (requested_addr != NULL) {
2139 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2140 flags |= MAP_FIXED;
2141 }
2142 }
2143
2144 char* addr = (char*)::mmap(requested_addr, extra_size,
2145 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2146
2147 if (addr == MAP_FAILED) {
2148 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2149 return NULL;
2150 }
2151
2152 // Handle alignment.
2153 char* const addr_aligned = align_up(addr, alignment_hint);
2154 const size_t waste_pre = addr_aligned - addr;
2155 char* const addr_aligned_end = addr_aligned + size;
2156 const size_t waste_post = extra_size - waste_pre - size;
2157 if (waste_pre > 0) {
2158 ::munmap(addr, waste_pre);
2159 }
2160 if (waste_post > 0) {
2161 ::munmap(addr_aligned_end, waste_post);
2162 }
2163 addr = addr_aligned;
2164
2165 if (addr) {
2166 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2167 addr, addr + bytes, bytes);
2168 } else {
2169 if (requested_addr != NULL) {
2170 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2171 } else {
2172 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2173 }
2174 }
2175
2176 // bookkeeping
2177 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2178
2179 // Test alignment, see above.
2180 assert0(is_aligned_to(addr, os::vm_page_size()));
2181
2182 return addr;
2183 }
2184
2185 static bool release_mmaped_memory(char* addr, size_t size) {
2186 assert0(is_aligned_to(addr, os::vm_page_size()));
2187 assert0(is_aligned_to(size, os::vm_page_size()));
2188
2189 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2190 addr, addr + size - 1);
2191 bool rc = false;
2192
2193 if (::munmap(addr, size) != 0) {
2194 trcVerbose("failed (%d)\n", errno);
2195 rc = false;
2196 } else {
2197 trcVerbose("ok.");
2198 rc = true;
2199 }
2200
2201 return rc;
2202 }
2203
2204 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2205
2206 assert0(is_aligned_to(addr, os::vm_page_size()));
2207 assert0(is_aligned_to(size, os::vm_page_size()));
2208
2209 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2210 addr, addr + size - 1);
2211 bool rc = false;
2212
2213 // Uncommit mmap memory with msync MS_INVALIDATE.
2214 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2215 trcVerbose("failed (%d)\n", errno);
2216 rc = false;
2217 } else {
2218 trcVerbose("ok.");
2219 rc = true;
2220 }
2221
2222 return rc;
2223 }
2224
2225 int os::vm_page_size() {
2226 // Seems redundant as all get out.
2227 assert(os::Aix::page_size() != -1, "must call os::init");
2228 return os::Aix::page_size();
2229 }
2230
2231 // Aix allocates memory by pages.
2232 int os::vm_allocation_granularity() {
2233 assert(os::Aix::page_size() != -1, "must call os::init");
2234 return os::Aix::page_size();
2235 }
2236
2237 #ifdef PRODUCT
2238 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2239 int err) {
2240 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2241 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2242 os::errno_name(err), err);
2243 }
2244 #endif
2245
2246 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2247 const char* mesg) {
2248 assert(mesg != NULL, "mesg must be specified");
2249 if (!pd_commit_memory(addr, size, exec)) {
2250 // Add extra info in product mode for vm_exit_out_of_memory():
2251 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2252 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2253 }
2254 }
2255
2256 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2257
2258 assert(is_aligned_to(addr, os::vm_page_size()),
2259 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2260 p2i(addr), os::vm_page_size());
2261 assert(is_aligned_to(size, os::vm_page_size()),
2262 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2263 size, os::vm_page_size());
2264
2265 vmembk_t* const vmi = vmembk_find(addr);
2266 guarantee0(vmi);
2267 vmi->assert_is_valid_subrange(addr, size);
2268
2269 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2270
2271 if (UseExplicitCommit) {
2272 // AIX commits memory on touch. So, touch all pages to be committed.
2273 for (char* p = addr; p < (addr + size); p += 4*K) {
2274 *p = '\0';
2275 }
2276 }
2277
2278 return true;
2279 }
2280
2281 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2282 return pd_commit_memory(addr, size, exec);
2283 }
2284
2285 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2286 size_t alignment_hint, bool exec,
2287 const char* mesg) {
2288 // Alignment_hint is ignored on this OS.
2289 pd_commit_memory_or_exit(addr, size, exec, mesg);
2290 }
2291
2292 bool os::pd_uncommit_memory(char* addr, size_t size) {
2293 assert(is_aligned_to(addr, os::vm_page_size()),
2294 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2295 p2i(addr), os::vm_page_size());
2296 assert(is_aligned_to(size, os::vm_page_size()),
2297 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2298 size, os::vm_page_size());
2299
2300 // Dynamically do different things for mmap/shmat.
2301 const vmembk_t* const vmi = vmembk_find(addr);
2302 guarantee0(vmi);
2303 vmi->assert_is_valid_subrange(addr, size);
2304
2305 if (vmi->type == VMEM_SHMATED) {
2306 return uncommit_shmated_memory(addr, size);
2307 } else {
2308 return uncommit_mmaped_memory(addr, size);
2309 }
2310 }
2311
2312 bool os::pd_create_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 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2319 // Do not call this; no need to commit stack pages on AIX.
2320 ShouldNotReachHere();
2321 return true;
2322 }
2323
2324 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2325 }
2326
2327 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2328 }
2329
2330 void os::numa_make_global(char *addr, size_t bytes) {
2331 }
2332
2333 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2334 }
2335
2336 bool os::numa_topology_changed() {
2337 return false;
2338 }
2339
2340 size_t os::numa_get_groups_num() {
2341 return 1;
2342 }
2343
2344 int os::numa_get_group_id() {
2345 return 0;
2346 }
2347
2348 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2349 if (size > 0) {
2350 ids[0] = 0;
2351 return 1;
2352 }
2353 return 0;
2354 }
2355
2356 bool os::get_page_info(char *start, page_info* info) {
2357 return false;
2358 }
2359
2360 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2361 return end;
2362 }
2363
2364 // Reserves and attaches a shared memory segment.
2365 // Will assert if a wish address is given and could not be obtained.
2366 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2367
2368 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2369 // thereby clobbering old mappings at that place. That is probably
2370 // not intended, never used and almost certainly an error were it
2371 // ever be used this way (to try attaching at a specified address
2372 // without clobbering old mappings an alternate API exists,
2373 // os::attempt_reserve_memory_at()).
2374 // Instead of mimicking the dangerous coding of the other platforms, here I
2375 // just ignore the request address (release) or assert(debug).
2376 assert0(requested_addr == NULL);
2377
2378 // Always round to os::vm_page_size(), which may be larger than 4K.
2379 bytes = align_up(bytes, os::vm_page_size());
2380 const size_t alignment_hint0 =
2381 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2382
2383 // In 4K mode always use mmap.
2384 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2385 if (os::vm_page_size() == 4*K) {
2386 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2387 } else {
2388 if (bytes >= Use64KPagesThreshold) {
2389 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2390 } else {
2391 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2392 }
2393 }
2394 }
2395
2396 bool os::pd_release_memory(char* addr, size_t size) {
2397
2398 // Dynamically do different things for mmap/shmat.
2399 vmembk_t* const vmi = vmembk_find(addr);
2400 guarantee0(vmi);
2401
2402 // Always round to os::vm_page_size(), which may be larger than 4K.
2403 size = align_up(size, os::vm_page_size());
2404 addr = align_up(addr, os::vm_page_size());
2405
2406 bool rc = false;
2407 bool remove_bookkeeping = false;
2408 if (vmi->type == VMEM_SHMATED) {
2409 // For shmatted memory, we do:
2410 // - If user wants to release the whole range, release the memory (shmdt).
2411 // - If user only wants to release a partial range, uncommit (disclaim) that
2412 // range. That way, at least, we do not use memory anymore (bust still page
2413 // table space).
2414 vmi->assert_is_valid_subrange(addr, size);
2415 if (addr == vmi->addr && size == vmi->size) {
2416 rc = release_shmated_memory(addr, size);
2417 remove_bookkeeping = true;
2418 } else {
2419 rc = uncommit_shmated_memory(addr, size);
2420 }
2421 } else {
2422 // User may unmap partial regions but region has to be fully contained.
2423 #ifdef ASSERT
2424 vmi->assert_is_valid_subrange(addr, size);
2425 #endif
2426 rc = release_mmaped_memory(addr, size);
2427 remove_bookkeeping = true;
2428 }
2429
2430 // update bookkeeping
2431 if (rc && remove_bookkeeping) {
2432 vmembk_remove(vmi);
2433 }
2434
2435 return rc;
2436 }
2437
2438 static bool checked_mprotect(char* addr, size_t size, int prot) {
2439
2440 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2441 // not tell me if protection failed when trying to protect an un-protectable range.
2442 //
2443 // This means if the memory was allocated using shmget/shmat, protection wont work
2444 // but mprotect will still return 0:
2445 //
2446 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2447
2448 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2449
2450 if (!rc) {
2451 const char* const s_errno = os::errno_name(errno);
2452 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2453 return false;
2454 }
2455
2456 // mprotect success check
2457 //
2458 // Mprotect said it changed the protection but can I believe it?
2459 //
2460 // To be sure I need to check the protection afterwards. Try to
2461 // read from protected memory and check whether that causes a segfault.
2462 //
2463 if (!os::Aix::xpg_sus_mode()) {
2464
2465 if (CanUseSafeFetch32()) {
2466
2467 const bool read_protected =
2468 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2469 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2470
2471 if (prot & PROT_READ) {
2472 rc = !read_protected;
2473 } else {
2474 rc = read_protected;
2475 }
2476
2477 if (!rc) {
2478 if (os::Aix::on_pase()) {
2479 // There is an issue on older PASE systems where mprotect() will return success but the
2480 // memory will not be protected.
2481 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2482 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2483 // a stack. It is an OS error.
2484 //
2485 // A valid strategy is just to try again. This usually works. :-/
2486
2487 ::usleep(1000);
2488 if (::mprotect(addr, size, prot) == 0) {
2489 const bool read_protected_2 =
2490 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2491 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2492 rc = true;
2493 }
2494 }
2495 }
2496 }
2497 }
2498
2499 assert(rc == true, "mprotect failed.");
2500
2501 return rc;
2502 }
2503
2504 // Set protections specified
2505 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2506 unsigned int p = 0;
2507 switch (prot) {
2508 case MEM_PROT_NONE: p = PROT_NONE; break;
2509 case MEM_PROT_READ: p = PROT_READ; break;
2510 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2511 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2512 default:
2513 ShouldNotReachHere();
2514 }
2515 // is_committed is unused.
2516 return checked_mprotect(addr, size, p);
2517 }
2518
2519 bool os::guard_memory(char* addr, size_t size) {
2520 return checked_mprotect(addr, size, PROT_NONE);
2521 }
2522
2523 bool os::unguard_memory(char* addr, size_t size) {
2524 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2525 }
2526
2527 // Large page support
2528
2529 static size_t _large_page_size = 0;
2530
2531 // Enable large page support if OS allows that.
2532 void os::large_page_init() {
2533 return; // Nothing to do. See query_multipage_support and friends.
2534 }
2535
2536 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2537 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2538 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2539 // so this is not needed.
2540 assert(false, "should not be called on AIX");
2541 return NULL;
2542 }
2543
2544 bool os::release_memory_special(char* base, size_t bytes) {
2545 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2546 Unimplemented();
2547 return false;
2548 }
2549
2550 size_t os::large_page_size() {
2551 return _large_page_size;
2552 }
2553
2554 bool os::can_commit_large_page_memory() {
2555 // Does not matter, we do not support huge pages.
2556 return false;
2557 }
2558
2559 bool os::can_execute_large_page_memory() {
2560 // Does not matter, we do not support huge pages.
2561 return false;
2562 }
2563
2564 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2565 assert(file_desc >= 0, "file_desc is not valid");
2566 char* result = NULL;
2567
2568 // Always round to os::vm_page_size(), which may be larger than 4K.
2569 bytes = align_up(bytes, os::vm_page_size());
2570 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2571
2572 if (result != NULL) {
2573 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2574 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2575 }
2576 }
2577 return result;
2578 }
2579
2580 // Reserve memory at an arbitrary address, only if that area is
2581 // available (and not reserved for something else).
2582 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2583 char* addr = NULL;
2584
2585 // Always round to os::vm_page_size(), which may be larger than 4K.
2586 bytes = align_up(bytes, os::vm_page_size());
2587
2588 // In 4K mode always use mmap.
2589 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2590 if (os::vm_page_size() == 4*K) {
2591 return reserve_mmaped_memory(bytes, requested_addr, 0);
2592 } else {
2593 if (bytes >= Use64KPagesThreshold) {
2594 return reserve_shmated_memory(bytes, requested_addr, 0);
2595 } else {
2596 return reserve_mmaped_memory(bytes, requested_addr, 0);
2597 }
2598 }
2599
2600 return addr;
2601 }
2602
2603 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2604 return ::read(fd, buf, nBytes);
2605 }
2606
2607 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2608 return ::pread(fd, buf, nBytes, offset);
2609 }
2610
2611 void os::naked_short_sleep(jlong ms) {
2612 struct timespec req;
2613
2614 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2615 req.tv_sec = 0;
2616 if (ms > 0) {
2617 req.tv_nsec = (ms % 1000) * 1000000;
2618 }
2619 else {
2620 req.tv_nsec = 1;
2621 }
2622
2623 nanosleep(&req, NULL);
2624
2625 return;
2626 }
2627
2628 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2629 void os::infinite_sleep() {
2630 while (true) { // sleep forever ...
2631 ::sleep(100); // ... 100 seconds at a time
2632 }
2633 }
2634
2635 // Used to convert frequent JVM_Yield() to nops
2636 bool os::dont_yield() {
2637 return DontYieldALot;
2638 }
2639
2640 void os::naked_yield() {
2641 sched_yield();
2642 }
2643
2644 ////////////////////////////////////////////////////////////////////////////////
2645 // thread priority support
2646
2647 // From AIX manpage to pthread_setschedparam
2648 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2649 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2650 //
2651 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2652 // range from 40 to 80, where 40 is the least favored priority and 80
2653 // is the most favored."
2654 //
2655 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2656 // scheduling there; however, this still leaves iSeries.)
2657 //
2658 // We use the same values for AIX and PASE.
2659 int os::java_to_os_priority[CriticalPriority + 1] = {
2660 54, // 0 Entry should never be used
2661
2662 55, // 1 MinPriority
2663 55, // 2
2664 56, // 3
2665
2666 56, // 4
2667 57, // 5 NormPriority
2668 57, // 6
2669
2670 58, // 7
2671 58, // 8
2672 59, // 9 NearMaxPriority
2673
2674 60, // 10 MaxPriority
2675
2676 60 // 11 CriticalPriority
2677 };
2678
2679 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2680 if (!UseThreadPriorities) return OS_OK;
2681 pthread_t thr = thread->osthread()->pthread_id();
2682 int policy = SCHED_OTHER;
2683 struct sched_param param;
2684 param.sched_priority = newpri;
2685 int ret = pthread_setschedparam(thr, policy, ¶m);
2686
2687 if (ret != 0) {
2688 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2689 (int)thr, newpri, ret, os::errno_name(ret));
2690 }
2691 return (ret == 0) ? OS_OK : OS_ERR;
2692 }
2693
2694 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2695 if (!UseThreadPriorities) {
2696 *priority_ptr = java_to_os_priority[NormPriority];
2697 return OS_OK;
2698 }
2699 pthread_t thr = thread->osthread()->pthread_id();
2700 int policy = SCHED_OTHER;
2701 struct sched_param param;
2702 int ret = pthread_getschedparam(thr, &policy, ¶m);
2703 *priority_ptr = param.sched_priority;
2704
2705 return (ret == 0) ? OS_OK : OS_ERR;
2706 }
2707
2708 ////////////////////////////////////////////////////////////////////////////////
2709 // suspend/resume support
2710
2711 // The low-level signal-based suspend/resume support is a remnant from the
2712 // old VM-suspension that used to be for java-suspension, safepoints etc,
2713 // within hotspot. Currently used by JFR's OSThreadSampler
2714 //
2715 // The remaining code is greatly simplified from the more general suspension
2716 // code that used to be used.
2717 //
2718 // The protocol is quite simple:
2719 // - suspend:
2720 // - sends a signal to the target thread
2721 // - polls the suspend state of the osthread using a yield loop
2722 // - target thread signal handler (SR_handler) sets suspend state
2723 // and blocks in sigsuspend until continued
2724 // - resume:
2725 // - sets target osthread state to continue
2726 // - sends signal to end the sigsuspend loop in the SR_handler
2727 //
2728 // Note that the SR_lock plays no role in this suspend/resume protocol,
2729 // but is checked for NULL in SR_handler as a thread termination indicator.
2730 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2731 //
2732 // Note that resume_clear_context() and suspend_save_context() are needed
2733 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2734 // which in part is used by:
2735 // - Forte Analyzer: AsyncGetCallTrace()
2736 // - StackBanging: get_frame_at_stack_banging_point()
2737
2738 static void resume_clear_context(OSThread *osthread) {
2739 osthread->set_ucontext(NULL);
2740 osthread->set_siginfo(NULL);
2741 }
2742
2743 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2744 osthread->set_ucontext(context);
2745 osthread->set_siginfo(siginfo);
2746 }
2747
2748 //
2749 // Handler function invoked when a thread's execution is suspended or
2750 // resumed. We have to be careful that only async-safe functions are
2751 // called here (Note: most pthread functions are not async safe and
2752 // should be avoided.)
2753 //
2754 // Note: sigwait() is a more natural fit than sigsuspend() from an
2755 // interface point of view, but sigwait() prevents the signal hander
2756 // from being run. libpthread would get very confused by not having
2757 // its signal handlers run and prevents sigwait()'s use with the
2758 // mutex granting granting signal.
2759 //
2760 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2761 //
2762 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2763 // Save and restore errno to avoid confusing native code with EINTR
2764 // after sigsuspend.
2765 int old_errno = errno;
2766
2767 Thread* thread = Thread::current_or_null_safe();
2768 assert(thread != NULL, "Missing current thread in SR_handler");
2769
2770 // On some systems we have seen signal delivery get "stuck" until the signal
2771 // mask is changed as part of thread termination. Check that the current thread
2772 // has not already terminated (via SR_lock()) - else the following assertion
2773 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2774 // destructor has completed.
2775
2776 if (thread->SR_lock() == NULL) {
2777 return;
2778 }
2779
2780 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2781
2782 OSThread* osthread = thread->osthread();
2783
2784 os::SuspendResume::State current = osthread->sr.state();
2785 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2786 suspend_save_context(osthread, siginfo, context);
2787
2788 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2789 os::SuspendResume::State state = osthread->sr.suspended();
2790 if (state == os::SuspendResume::SR_SUSPENDED) {
2791 sigset_t suspend_set; // signals for sigsuspend()
2792
2793 // get current set of blocked signals and unblock resume signal
2794 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2795 sigdelset(&suspend_set, SR_signum);
2796
2797 // wait here until we are resumed
2798 while (1) {
2799 sigsuspend(&suspend_set);
2800
2801 os::SuspendResume::State result = osthread->sr.running();
2802 if (result == os::SuspendResume::SR_RUNNING) {
2803 break;
2804 }
2805 }
2806
2807 } else if (state == os::SuspendResume::SR_RUNNING) {
2808 // request was cancelled, continue
2809 } else {
2810 ShouldNotReachHere();
2811 }
2812
2813 resume_clear_context(osthread);
2814 } else if (current == os::SuspendResume::SR_RUNNING) {
2815 // request was cancelled, continue
2816 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2817 // ignore
2818 } else {
2819 ShouldNotReachHere();
2820 }
2821
2822 errno = old_errno;
2823 }
2824
2825 static int SR_initialize() {
2826 struct sigaction act;
2827 char *s;
2828 // Get signal number to use for suspend/resume
2829 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2830 int sig = ::strtol(s, 0, 10);
2831 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2832 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2833 SR_signum = sig;
2834 } else {
2835 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2836 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2837 }
2838 }
2839
2840 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2841 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2842
2843 sigemptyset(&SR_sigset);
2844 sigaddset(&SR_sigset, SR_signum);
2845
2846 // Set up signal handler for suspend/resume.
2847 act.sa_flags = SA_RESTART|SA_SIGINFO;
2848 act.sa_handler = (void (*)(int)) SR_handler;
2849
2850 // SR_signum is blocked by default.
2851 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2852
2853 if (sigaction(SR_signum, &act, 0) == -1) {
2854 return -1;
2855 }
2856
2857 // Save signal flag
2858 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2859 return 0;
2860 }
2861
2862 static int SR_finalize() {
2863 return 0;
2864 }
2865
2866 static int sr_notify(OSThread* osthread) {
2867 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2868 assert_status(status == 0, status, "pthread_kill");
2869 return status;
2870 }
2871
2872 // "Randomly" selected value for how long we want to spin
2873 // before bailing out on suspending a thread, also how often
2874 // we send a signal to a thread we want to resume
2875 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2876 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2877
2878 // returns true on success and false on error - really an error is fatal
2879 // but this seems the normal response to library errors
2880 static bool do_suspend(OSThread* osthread) {
2881 assert(osthread->sr.is_running(), "thread should be running");
2882 // mark as suspended and send signal
2883
2884 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2885 // failed to switch, state wasn't running?
2886 ShouldNotReachHere();
2887 return false;
2888 }
2889
2890 if (sr_notify(osthread) != 0) {
2891 // try to cancel, switch to running
2892
2893 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2894 if (result == os::SuspendResume::SR_RUNNING) {
2895 // cancelled
2896 return false;
2897 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2898 // somehow managed to suspend
2899 return true;
2900 } else {
2901 ShouldNotReachHere();
2902 return false;
2903 }
2904 }
2905
2906 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2907
2908 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2909 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2910 os::naked_yield();
2911 }
2912
2913 // timeout, try to cancel the request
2914 if (n >= RANDOMLY_LARGE_INTEGER) {
2915 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2916 if (cancelled == os::SuspendResume::SR_RUNNING) {
2917 return false;
2918 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2919 return true;
2920 } else {
2921 ShouldNotReachHere();
2922 return false;
2923 }
2924 }
2925 }
2926
2927 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2928 return true;
2929 }
2930
2931 static void do_resume(OSThread* osthread) {
2932 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2933
2934 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2935 // failed to switch to WAKEUP_REQUEST
2936 ShouldNotReachHere();
2937 return;
2938 }
2939
2940 while (!osthread->sr.is_running()) {
2941 if (sr_notify(osthread) == 0) {
2942 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2943 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2944 os::naked_yield();
2945 }
2946 }
2947 } else {
2948 ShouldNotReachHere();
2949 }
2950 }
2951
2952 guarantee(osthread->sr.is_running(), "Must be running!");
2953 }
2954
2955 ///////////////////////////////////////////////////////////////////////////////////
2956 // signal handling (except suspend/resume)
2957
2958 // This routine may be used by user applications as a "hook" to catch signals.
2959 // The user-defined signal handler must pass unrecognized signals to this
2960 // routine, and if it returns true (non-zero), then the signal handler must
2961 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2962 // routine will never retun false (zero), but instead will execute a VM panic
2963 // routine kill the process.
2964 //
2965 // If this routine returns false, it is OK to call it again. This allows
2966 // the user-defined signal handler to perform checks either before or after
2967 // the VM performs its own checks. Naturally, the user code would be making
2968 // a serious error if it tried to handle an exception (such as a null check
2969 // or breakpoint) that the VM was generating for its own correct operation.
2970 //
2971 // This routine may recognize any of the following kinds of signals:
2972 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2973 // It should be consulted by handlers for any of those signals.
2974 //
2975 // The caller of this routine must pass in the three arguments supplied
2976 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2977 // field of the structure passed to sigaction(). This routine assumes that
2978 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2979 //
2980 // Note that the VM will print warnings if it detects conflicting signal
2981 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2982 //
2983 extern "C" JNIEXPORT int
2984 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2985
2986 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2987 // to be the thing to call; documentation is not terribly clear about whether
2988 // pthread_sigmask also works, and if it does, whether it does the same.
2989 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2990 const int rc = ::pthread_sigmask(how, set, oset);
2991 // return value semantics differ slightly for error case:
2992 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2993 // (so, pthread_sigmask is more theadsafe for error handling)
2994 // But success is always 0.
2995 return rc == 0 ? true : false;
2996 }
2997
2998 // Function to unblock all signals which are, according
2999 // to POSIX, typical program error signals. If they happen while being blocked,
3000 // they typically will bring down the process immediately.
3001 bool unblock_program_error_signals() {
3002 sigset_t set;
3003 ::sigemptyset(&set);
3004 ::sigaddset(&set, SIGILL);
3005 ::sigaddset(&set, SIGBUS);
3006 ::sigaddset(&set, SIGFPE);
3007 ::sigaddset(&set, SIGSEGV);
3008 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3009 }
3010
3011 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3012 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3013 assert(info != NULL && uc != NULL, "it must be old kernel");
3014
3015 // Never leave program error signals blocked;
3016 // on all our platforms they would bring down the process immediately when
3017 // getting raised while being blocked.
3018 unblock_program_error_signals();
3019
3020 int orig_errno = errno; // Preserve errno value over signal handler.
3021 JVM_handle_aix_signal(sig, info, uc, true);
3022 errno = orig_errno;
3023 }
3024
3025 // This boolean allows users to forward their own non-matching signals
3026 // to JVM_handle_aix_signal, harmlessly.
3027 bool os::Aix::signal_handlers_are_installed = false;
3028
3029 // For signal-chaining
3030 struct sigaction sigact[NSIG];
3031 sigset_t sigs;
3032 bool os::Aix::libjsig_is_loaded = false;
3033 typedef struct sigaction *(*get_signal_t)(int);
3034 get_signal_t os::Aix::get_signal_action = NULL;
3035
3036 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3037 struct sigaction *actp = NULL;
3038
3039 if (libjsig_is_loaded) {
3040 // Retrieve the old signal handler from libjsig
3041 actp = (*get_signal_action)(sig);
3042 }
3043 if (actp == NULL) {
3044 // Retrieve the preinstalled signal handler from jvm
3045 actp = get_preinstalled_handler(sig);
3046 }
3047
3048 return actp;
3049 }
3050
3051 static bool call_chained_handler(struct sigaction *actp, int sig,
3052 siginfo_t *siginfo, void *context) {
3053 // Call the old signal handler
3054 if (actp->sa_handler == SIG_DFL) {
3055 // It's more reasonable to let jvm treat it as an unexpected exception
3056 // instead of taking the default action.
3057 return false;
3058 } else if (actp->sa_handler != SIG_IGN) {
3059 if ((actp->sa_flags & SA_NODEFER) == 0) {
3060 // automaticlly block the signal
3061 sigaddset(&(actp->sa_mask), sig);
3062 }
3063
3064 sa_handler_t hand = NULL;
3065 sa_sigaction_t sa = NULL;
3066 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3067 // retrieve the chained handler
3068 if (siginfo_flag_set) {
3069 sa = actp->sa_sigaction;
3070 } else {
3071 hand = actp->sa_handler;
3072 }
3073
3074 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3075 actp->sa_handler = SIG_DFL;
3076 }
3077
3078 // try to honor the signal mask
3079 sigset_t oset;
3080 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3081
3082 // call into the chained handler
3083 if (siginfo_flag_set) {
3084 (*sa)(sig, siginfo, context);
3085 } else {
3086 (*hand)(sig);
3087 }
3088
3089 // restore the signal mask
3090 pthread_sigmask(SIG_SETMASK, &oset, 0);
3091 }
3092 // Tell jvm's signal handler the signal is taken care of.
3093 return true;
3094 }
3095
3096 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3097 bool chained = false;
3098 // signal-chaining
3099 if (UseSignalChaining) {
3100 struct sigaction *actp = get_chained_signal_action(sig);
3101 if (actp != NULL) {
3102 chained = call_chained_handler(actp, sig, siginfo, context);
3103 }
3104 }
3105 return chained;
3106 }
3107
3108 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3109 if (sigismember(&sigs, sig)) {
3110 return &sigact[sig];
3111 }
3112 return NULL;
3113 }
3114
3115 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3116 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3117 sigact[sig] = oldAct;
3118 sigaddset(&sigs, sig);
3119 }
3120
3121 // for diagnostic
3122 int sigflags[NSIG];
3123
3124 int os::Aix::get_our_sigflags(int sig) {
3125 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3126 return sigflags[sig];
3127 }
3128
3129 void os::Aix::set_our_sigflags(int sig, int flags) {
3130 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3131 if (sig > 0 && sig < NSIG) {
3132 sigflags[sig] = flags;
3133 }
3134 }
3135
3136 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3137 // Check for overwrite.
3138 struct sigaction oldAct;
3139 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3140
3141 void* oldhand = oldAct.sa_sigaction
3142 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3143 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3144 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3145 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3146 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3147 if (AllowUserSignalHandlers || !set_installed) {
3148 // Do not overwrite; user takes responsibility to forward to us.
3149 return;
3150 } else if (UseSignalChaining) {
3151 // save the old handler in jvm
3152 save_preinstalled_handler(sig, oldAct);
3153 // libjsig also interposes the sigaction() call below and saves the
3154 // old sigaction on it own.
3155 } else {
3156 fatal("Encountered unexpected pre-existing sigaction handler "
3157 "%#lx for signal %d.", (long)oldhand, sig);
3158 }
3159 }
3160
3161 struct sigaction sigAct;
3162 sigfillset(&(sigAct.sa_mask));
3163 if (!set_installed) {
3164 sigAct.sa_handler = SIG_DFL;
3165 sigAct.sa_flags = SA_RESTART;
3166 } else {
3167 sigAct.sa_sigaction = javaSignalHandler;
3168 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3169 }
3170 // Save flags, which are set by ours
3171 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3172 sigflags[sig] = sigAct.sa_flags;
3173
3174 int ret = sigaction(sig, &sigAct, &oldAct);
3175 assert(ret == 0, "check");
3176
3177 void* oldhand2 = oldAct.sa_sigaction
3178 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3179 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3180 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3181 }
3182
3183 // install signal handlers for signals that HotSpot needs to
3184 // handle in order to support Java-level exception handling.
3185 void os::Aix::install_signal_handlers() {
3186 if (!signal_handlers_are_installed) {
3187 signal_handlers_are_installed = true;
3188
3189 // signal-chaining
3190 typedef void (*signal_setting_t)();
3191 signal_setting_t begin_signal_setting = NULL;
3192 signal_setting_t end_signal_setting = NULL;
3193 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3194 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3195 if (begin_signal_setting != NULL) {
3196 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3197 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3198 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3199 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3200 libjsig_is_loaded = true;
3201 assert(UseSignalChaining, "should enable signal-chaining");
3202 }
3203 if (libjsig_is_loaded) {
3204 // Tell libjsig jvm is setting signal handlers.
3205 (*begin_signal_setting)();
3206 }
3207
3208 ::sigemptyset(&sigs);
3209 set_signal_handler(SIGSEGV, true);
3210 set_signal_handler(SIGPIPE, true);
3211 set_signal_handler(SIGBUS, true);
3212 set_signal_handler(SIGILL, true);
3213 set_signal_handler(SIGFPE, true);
3214 set_signal_handler(SIGTRAP, true);
3215 set_signal_handler(SIGXFSZ, true);
3216
3217 if (libjsig_is_loaded) {
3218 // Tell libjsig jvm finishes setting signal handlers.
3219 (*end_signal_setting)();
3220 }
3221
3222 // We don't activate signal checker if libjsig is in place, we trust ourselves
3223 // and if UserSignalHandler is installed all bets are off.
3224 // Log that signal checking is off only if -verbose:jni is specified.
3225 if (CheckJNICalls) {
3226 if (libjsig_is_loaded) {
3227 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3228 check_signals = false;
3229 }
3230 if (AllowUserSignalHandlers) {
3231 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3232 check_signals = false;
3233 }
3234 // Need to initialize check_signal_done.
3235 ::sigemptyset(&check_signal_done);
3236 }
3237 }
3238 }
3239
3240 static const char* get_signal_handler_name(address handler,
3241 char* buf, int buflen) {
3242 int offset;
3243 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3244 if (found) {
3245 // skip directory names
3246 const char *p1, *p2;
3247 p1 = buf;
3248 size_t len = strlen(os::file_separator());
3249 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3250 // The way os::dll_address_to_library_name is implemented on Aix
3251 // right now, it always returns -1 for the offset which is not
3252 // terribly informative.
3253 // Will fix that. For now, omit the offset.
3254 jio_snprintf(buf, buflen, "%s", p1);
3255 } else {
3256 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3257 }
3258 return buf;
3259 }
3260
3261 static void print_signal_handler(outputStream* st, int sig,
3262 char* buf, size_t buflen) {
3263 struct sigaction sa;
3264 sigaction(sig, NULL, &sa);
3265
3266 st->print("%s: ", os::exception_name(sig, buf, buflen));
3267
3268 address handler = (sa.sa_flags & SA_SIGINFO)
3269 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3270 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3271
3272 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3273 st->print("SIG_DFL");
3274 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3275 st->print("SIG_IGN");
3276 } else {
3277 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3278 }
3279
3280 // Print readable mask.
3281 st->print(", sa_mask[0]=");
3282 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3283
3284 address rh = VMError::get_resetted_sighandler(sig);
3285 // May be, handler was resetted by VMError?
3286 if (rh != NULL) {
3287 handler = rh;
3288 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3289 }
3290
3291 // Print textual representation of sa_flags.
3292 st->print(", sa_flags=");
3293 os::Posix::print_sa_flags(st, sa.sa_flags);
3294
3295 // Check: is it our handler?
3296 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3297 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3298 // It is our signal handler.
3299 // Check for flags, reset system-used one!
3300 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3301 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3302 os::Aix::get_our_sigflags(sig));
3303 }
3304 }
3305 st->cr();
3306 }
3307
3308 #define DO_SIGNAL_CHECK(sig) \
3309 if (!sigismember(&check_signal_done, sig)) \
3310 os::Aix::check_signal_handler(sig)
3311
3312 // This method is a periodic task to check for misbehaving JNI applications
3313 // under CheckJNI, we can add any periodic checks here
3314
3315 void os::run_periodic_checks() {
3316
3317 if (check_signals == false) return;
3318
3319 // SEGV and BUS if overridden could potentially prevent
3320 // generation of hs*.log in the event of a crash, debugging
3321 // such a case can be very challenging, so we absolutely
3322 // check the following for a good measure:
3323 DO_SIGNAL_CHECK(SIGSEGV);
3324 DO_SIGNAL_CHECK(SIGILL);
3325 DO_SIGNAL_CHECK(SIGFPE);
3326 DO_SIGNAL_CHECK(SIGBUS);
3327 DO_SIGNAL_CHECK(SIGPIPE);
3328 DO_SIGNAL_CHECK(SIGXFSZ);
3329 if (UseSIGTRAP) {
3330 DO_SIGNAL_CHECK(SIGTRAP);
3331 }
3332
3333 // ReduceSignalUsage allows the user to override these handlers
3334 // see comments at the very top and jvm_md.h
3335 if (!ReduceSignalUsage) {
3336 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3337 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3338 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3339 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3340 }
3341
3342 DO_SIGNAL_CHECK(SR_signum);
3343 }
3344
3345 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3346
3347 static os_sigaction_t os_sigaction = NULL;
3348
3349 void os::Aix::check_signal_handler(int sig) {
3350 char buf[O_BUFLEN];
3351 address jvmHandler = NULL;
3352
3353 struct sigaction act;
3354 if (os_sigaction == NULL) {
3355 // only trust the default sigaction, in case it has been interposed
3356 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3357 if (os_sigaction == NULL) return;
3358 }
3359
3360 os_sigaction(sig, (struct sigaction*)NULL, &act);
3361
3362 address thisHandler = (act.sa_flags & SA_SIGINFO)
3363 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3364 : CAST_FROM_FN_PTR(address, act.sa_handler);
3365
3366 switch(sig) {
3367 case SIGSEGV:
3368 case SIGBUS:
3369 case SIGFPE:
3370 case SIGPIPE:
3371 case SIGILL:
3372 case SIGXFSZ:
3373 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3374 break;
3375
3376 case SHUTDOWN1_SIGNAL:
3377 case SHUTDOWN2_SIGNAL:
3378 case SHUTDOWN3_SIGNAL:
3379 case BREAK_SIGNAL:
3380 jvmHandler = (address)user_handler();
3381 break;
3382
3383 default:
3384 if (sig == SR_signum) {
3385 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3386 } else {
3387 return;
3388 }
3389 break;
3390 }
3391
3392 if (thisHandler != jvmHandler) {
3393 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3394 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3395 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3396 // No need to check this sig any longer
3397 sigaddset(&check_signal_done, sig);
3398 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3399 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3400 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3401 exception_name(sig, buf, O_BUFLEN));
3402 }
3403 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3404 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3405 tty->print("expected:");
3406 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3407 tty->cr();
3408 tty->print(" found:");
3409 os::Posix::print_sa_flags(tty, act.sa_flags);
3410 tty->cr();
3411 // No need to check this sig any longer
3412 sigaddset(&check_signal_done, sig);
3413 }
3414
3415 // Dump all the signal
3416 if (sigismember(&check_signal_done, sig)) {
3417 print_signal_handlers(tty, buf, O_BUFLEN);
3418 }
3419 }
3420
3421 // To install functions for atexit system call
3422 extern "C" {
3423 static void perfMemory_exit_helper() {
3424 perfMemory_exit();
3425 }
3426 }
3427
3428 // This is called _before_ the most of global arguments have been parsed.
3429 void os::init(void) {
3430 // This is basic, we want to know if that ever changes.
3431 // (Shared memory boundary is supposed to be a 256M aligned.)
3432 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3433
3434 // Record process break at startup.
3435 g_brk_at_startup = (address) ::sbrk(0);
3436 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3437
3438 // First off, we need to know whether we run on AIX or PASE, and
3439 // the OS level we run on.
3440 os::Aix::initialize_os_info();
3441
3442 // Scan environment (SPEC1170 behaviour, etc).
3443 os::Aix::scan_environment();
3444
3445 // Probe multipage support.
3446 query_multipage_support();
3447
3448 // Act like we only have one page size by eliminating corner cases which
3449 // we did not support very well anyway.
3450 // We have two input conditions:
3451 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3452 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3453 // setting.
3454 // Data segment page size is important for us because it defines the thread stack page
3455 // size, which is needed for guard page handling, stack banging etc.
3456 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3457 // and should be allocated with 64k pages.
3458 //
3459 // So, we do the following:
3460 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3461 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3462 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3463 // 64k no --- AIX 5.2 ? ---
3464 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3465
3466 // We explicitly leave no option to change page size, because only upgrading would work,
3467 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3468
3469 if (g_multipage_support.datapsize == 4*K) {
3470 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3471 if (g_multipage_support.can_use_64K_pages) {
3472 // .. but we are able to use 64K pages dynamically.
3473 // This would be typical for java launchers which are not linked
3474 // with datapsize=64K (like, any other launcher but our own).
3475 //
3476 // In this case it would be smart to allocate the java heap with 64K
3477 // to get the performance benefit, and to fake 64k pages for the
3478 // data segment (when dealing with thread stacks).
3479 //
3480 // However, leave a possibility to downgrade to 4K, using
3481 // -XX:-Use64KPages.
3482 if (Use64KPages) {
3483 trcVerbose("64K page mode (faked for data segment)");
3484 Aix::_page_size = 64*K;
3485 } else {
3486 trcVerbose("4K page mode (Use64KPages=off)");
3487 Aix::_page_size = 4*K;
3488 }
3489 } else {
3490 // .. and not able to allocate 64k pages dynamically. Here, just
3491 // fall back to 4K paged mode and use mmap for everything.
3492 trcVerbose("4K page mode");
3493 Aix::_page_size = 4*K;
3494 FLAG_SET_ERGO(bool, Use64KPages, false);
3495 }
3496 } else {
3497 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3498 // This normally means that we can allocate 64k pages dynamically.
3499 // (There is one special case where this may be false: EXTSHM=on.
3500 // but we decided to not support that mode).
3501 assert0(g_multipage_support.can_use_64K_pages);
3502 Aix::_page_size = 64*K;
3503 trcVerbose("64K page mode");
3504 FLAG_SET_ERGO(bool, Use64KPages, true);
3505 }
3506
3507 // For now UseLargePages is just ignored.
3508 FLAG_SET_ERGO(bool, UseLargePages, false);
3509 _page_sizes[0] = 0;
3510
3511 // debug trace
3512 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3513
3514 // Next, we need to initialize libo4 and libperfstat libraries.
3515 if (os::Aix::on_pase()) {
3516 os::Aix::initialize_libo4();
3517 } else {
3518 os::Aix::initialize_libperfstat();
3519 }
3520
3521 // Reset the perfstat information provided by ODM.
3522 if (os::Aix::on_aix()) {
3523 libperfstat::perfstat_reset();
3524 }
3525
3526 // Now initialze basic system properties. Note that for some of the values we
3527 // need libperfstat etc.
3528 os::Aix::initialize_system_info();
3529
3530 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3531
3532 init_random(1234567);
3533
3534 // _main_thread points to the thread that created/loaded the JVM.
3535 Aix::_main_thread = pthread_self();
3536
3537 initial_time_count = os::elapsed_counter();
3538
3539 os::Posix::init();
3540 }
3541
3542 // This is called _after_ the global arguments have been parsed.
3543 jint os::init_2(void) {
3544
3545 os::Posix::init_2();
3546
3547 if (os::Aix::on_pase()) {
3548 trcVerbose("Running on PASE.");
3549 } else {
3550 trcVerbose("Running on AIX (not PASE).");
3551 }
3552
3553 trcVerbose("processor count: %d", os::_processor_count);
3554 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3555
3556 // Initially build up the loaded dll map.
3557 LoadedLibraries::reload();
3558 if (Verbose) {
3559 trcVerbose("Loaded Libraries: ");
3560 LoadedLibraries::print(tty);
3561 }
3562
3563 // initialize suspend/resume support - must do this before signal_sets_init()
3564 if (SR_initialize() != 0) {
3565 perror("SR_initialize failed");
3566 return JNI_ERR;
3567 }
3568
3569 Aix::signal_sets_init();
3570 Aix::install_signal_handlers();
3571 // Initialize data for jdk.internal.misc.Signal
3572 if (!ReduceSignalUsage) {
3573 jdk_misc_signal_init();
3574 }
3575
3576 // Check and sets minimum stack sizes against command line options
3577 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3578 return JNI_ERR;
3579 }
3580
3581 if (UseNUMA) {
3582 UseNUMA = false;
3583 warning("NUMA optimizations are not available on this OS.");
3584 }
3585
3586 if (MaxFDLimit) {
3587 // Set the number of file descriptors to max. print out error
3588 // if getrlimit/setrlimit fails but continue regardless.
3589 struct rlimit nbr_files;
3590 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3591 if (status != 0) {
3592 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3593 } else {
3594 nbr_files.rlim_cur = nbr_files.rlim_max;
3595 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3596 if (status != 0) {
3597 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3598 }
3599 }
3600 }
3601
3602 if (PerfAllowAtExitRegistration) {
3603 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3604 // At exit functions can be delayed until process exit time, which
3605 // can be problematic for embedded VM situations. Embedded VMs should
3606 // call DestroyJavaVM() to assure that VM resources are released.
3607
3608 // Note: perfMemory_exit_helper atexit function may be removed in
3609 // the future if the appropriate cleanup code can be added to the
3610 // VM_Exit VMOperation's doit method.
3611 if (atexit(perfMemory_exit_helper) != 0) {
3612 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3613 }
3614 }
3615
3616 return JNI_OK;
3617 }
3618
3619 // Mark the polling page as unreadable
3620 void os::make_polling_page_unreadable(void) {
3621 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3622 fatal("Could not disable polling page");
3623 }
3624 };
3625
3626 // Mark the polling page as readable
3627 void os::make_polling_page_readable(void) {
3628 // Changed according to os_linux.cpp.
3629 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3630 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3631 }
3632 };
3633
3634 int os::active_processor_count() {
3635 // User has overridden the number of active processors
3636 if (ActiveProcessorCount > 0) {
3637 log_trace(os)("active_processor_count: "
3638 "active processor count set by user : %d",
3639 ActiveProcessorCount);
3640 return ActiveProcessorCount;
3641 }
3642
3643 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3644 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3645 return online_cpus;
3646 }
3647
3648 void os::set_native_thread_name(const char *name) {
3649 // Not yet implemented.
3650 return;
3651 }
3652
3653 bool os::distribute_processes(uint length, uint* distribution) {
3654 // Not yet implemented.
3655 return false;
3656 }
3657
3658 bool os::bind_to_processor(uint processor_id) {
3659 // Not yet implemented.
3660 return false;
3661 }
3662
3663 void os::SuspendedThreadTask::internal_do_task() {
3664 if (do_suspend(_thread->osthread())) {
3665 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3666 do_task(context);
3667 do_resume(_thread->osthread());
3668 }
3669 }
3670
3671 ////////////////////////////////////////////////////////////////////////////////
3672 // debug support
3673
3674 bool os::find(address addr, outputStream* st) {
3675
3676 st->print(PTR_FORMAT ": ", addr);
3677
3678 loaded_module_t lm;
3679 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3680 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3681 st->print_cr("%s", lm.path);
3682 return true;
3683 }
3684
3685 return false;
3686 }
3687
3688 ////////////////////////////////////////////////////////////////////////////////
3689 // misc
3690
3691 // This does not do anything on Aix. This is basically a hook for being
3692 // able to use structured exception handling (thread-local exception filters)
3693 // on, e.g., Win32.
3694 void
3695 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3696 JavaCallArguments* args, Thread* thread) {
3697 f(value, method, args, thread);
3698 }
3699
3700 void os::print_statistics() {
3701 }
3702
3703 bool os::message_box(const char* title, const char* message) {
3704 int i;
3705 fdStream err(defaultStream::error_fd());
3706 for (i = 0; i < 78; i++) err.print_raw("=");
3707 err.cr();
3708 err.print_raw_cr(title);
3709 for (i = 0; i < 78; i++) err.print_raw("-");
3710 err.cr();
3711 err.print_raw_cr(message);
3712 for (i = 0; i < 78; i++) err.print_raw("=");
3713 err.cr();
3714
3715 char buf[16];
3716 // Prevent process from exiting upon "read error" without consuming all CPU
3717 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3718
3719 return buf[0] == 'y' || buf[0] == 'Y';
3720 }
3721
3722 // Is a (classpath) directory empty?
3723 bool os::dir_is_empty(const char* path) {
3724 DIR *dir = NULL;
3725 struct dirent *ptr;
3726
3727 dir = opendir(path);
3728 if (dir == NULL) return true;
3729
3730 /* Scan the directory */
3731 bool result = true;
3732 while (result && (ptr = readdir(dir)) != NULL) {
3733 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3734 result = false;
3735 }
3736 }
3737 closedir(dir);
3738 return result;
3739 }
3740
3741 // This code originates from JDK's sysOpen and open64_w
3742 // from src/solaris/hpi/src/system_md.c
3743
3744 int os::open(const char *path, int oflag, int mode) {
3745
3746 if (strlen(path) > MAX_PATH - 1) {
3747 errno = ENAMETOOLONG;
3748 return -1;
3749 }
3750 int fd;
3751
3752 fd = ::open64(path, oflag, mode);
3753 if (fd == -1) return -1;
3754
3755 // If the open succeeded, the file might still be a directory.
3756 {
3757 struct stat64 buf64;
3758 int ret = ::fstat64(fd, &buf64);
3759 int st_mode = buf64.st_mode;
3760
3761 if (ret != -1) {
3762 if ((st_mode & S_IFMT) == S_IFDIR) {
3763 errno = EISDIR;
3764 ::close(fd);
3765 return -1;
3766 }
3767 } else {
3768 ::close(fd);
3769 return -1;
3770 }
3771 }
3772
3773 // All file descriptors that are opened in the JVM and not
3774 // specifically destined for a subprocess should have the
3775 // close-on-exec flag set. If we don't set it, then careless 3rd
3776 // party native code might fork and exec without closing all
3777 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3778 // UNIXProcess.c), and this in turn might:
3779 //
3780 // - cause end-of-file to fail to be detected on some file
3781 // descriptors, resulting in mysterious hangs, or
3782 //
3783 // - might cause an fopen in the subprocess to fail on a system
3784 // suffering from bug 1085341.
3785 //
3786 // (Yes, the default setting of the close-on-exec flag is a Unix
3787 // design flaw.)
3788 //
3789 // See:
3790 // 1085341: 32-bit stdio routines should support file descriptors >255
3791 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3792 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3793 #ifdef FD_CLOEXEC
3794 {
3795 int flags = ::fcntl(fd, F_GETFD);
3796 if (flags != -1)
3797 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3798 }
3799 #endif
3800
3801 return fd;
3802 }
3803
3804 // create binary file, rewriting existing file if required
3805 int os::create_binary_file(const char* path, bool rewrite_existing) {
3806 int oflags = O_WRONLY | O_CREAT;
3807 if (!rewrite_existing) {
3808 oflags |= O_EXCL;
3809 }
3810 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3811 }
3812
3813 // return current position of file pointer
3814 jlong os::current_file_offset(int fd) {
3815 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3816 }
3817
3818 // move file pointer to the specified offset
3819 jlong os::seek_to_file_offset(int fd, jlong offset) {
3820 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3821 }
3822
3823 // This code originates from JDK's sysAvailable
3824 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3825
3826 int os::available(int fd, jlong *bytes) {
3827 jlong cur, end;
3828 int mode;
3829 struct stat64 buf64;
3830
3831 if (::fstat64(fd, &buf64) >= 0) {
3832 mode = buf64.st_mode;
3833 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3834 int n;
3835 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3836 *bytes = n;
3837 return 1;
3838 }
3839 }
3840 }
3841 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3842 return 0;
3843 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3844 return 0;
3845 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3846 return 0;
3847 }
3848 *bytes = end - cur;
3849 return 1;
3850 }
3851
3852 // Map a block of memory.
3853 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3854 char *addr, size_t bytes, bool read_only,
3855 bool allow_exec) {
3856 int prot;
3857 int flags = MAP_PRIVATE;
3858
3859 if (read_only) {
3860 prot = PROT_READ;
3861 flags = MAP_SHARED;
3862 } else {
3863 prot = PROT_READ | PROT_WRITE;
3864 flags = MAP_PRIVATE;
3865 }
3866
3867 if (allow_exec) {
3868 prot |= PROT_EXEC;
3869 }
3870
3871 if (addr != NULL) {
3872 flags |= MAP_FIXED;
3873 }
3874
3875 // Allow anonymous mappings if 'fd' is -1.
3876 if (fd == -1) {
3877 flags |= MAP_ANONYMOUS;
3878 }
3879
3880 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3881 fd, file_offset);
3882 if (mapped_address == MAP_FAILED) {
3883 return NULL;
3884 }
3885 return mapped_address;
3886 }
3887
3888 // Remap a block of memory.
3889 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3890 char *addr, size_t bytes, bool read_only,
3891 bool allow_exec) {
3892 // same as map_memory() on this OS
3893 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3894 allow_exec);
3895 }
3896
3897 // Unmap a block of memory.
3898 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3899 return munmap(addr, bytes) == 0;
3900 }
3901
3902 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3903 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3904 // of a thread.
3905 //
3906 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3907 // the fast estimate available on the platform.
3908
3909 jlong os::current_thread_cpu_time() {
3910 // return user + sys since the cost is the same
3911 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3912 assert(n >= 0, "negative CPU time");
3913 return n;
3914 }
3915
3916 jlong os::thread_cpu_time(Thread* thread) {
3917 // consistent with what current_thread_cpu_time() returns
3918 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3919 assert(n >= 0, "negative CPU time");
3920 return n;
3921 }
3922
3923 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3924 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3925 assert(n >= 0, "negative CPU time");
3926 return n;
3927 }
3928
3929 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3930 bool error = false;
3931
3932 jlong sys_time = 0;
3933 jlong user_time = 0;
3934
3935 // Reimplemented using getthrds64().
3936 //
3937 // Works like this:
3938 // For the thread in question, get the kernel thread id. Then get the
3939 // kernel thread statistics using that id.
3940 //
3941 // This only works of course when no pthread scheduling is used,
3942 // i.e. there is a 1:1 relationship to kernel threads.
3943 // On AIX, see AIXTHREAD_SCOPE variable.
3944
3945 pthread_t pthtid = thread->osthread()->pthread_id();
3946
3947 // retrieve kernel thread id for the pthread:
3948 tid64_t tid = 0;
3949 struct __pthrdsinfo pinfo;
3950 // I just love those otherworldly IBM APIs which force me to hand down
3951 // dummy buffers for stuff I dont care for...
3952 char dummy[1];
3953 int dummy_size = sizeof(dummy);
3954 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3955 dummy, &dummy_size) == 0) {
3956 tid = pinfo.__pi_tid;
3957 } else {
3958 tty->print_cr("pthread_getthrds_np failed.");
3959 error = true;
3960 }
3961
3962 // retrieve kernel timing info for that kernel thread
3963 if (!error) {
3964 struct thrdentry64 thrdentry;
3965 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3966 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3967 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3968 } else {
3969 tty->print_cr("pthread_getthrds_np failed.");
3970 error = true;
3971 }
3972 }
3973
3974 if (p_sys_time) {
3975 *p_sys_time = sys_time;
3976 }
3977
3978 if (p_user_time) {
3979 *p_user_time = user_time;
3980 }
3981
3982 if (error) {
3983 return false;
3984 }
3985
3986 return true;
3987 }
3988
3989 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3990 jlong sys_time;
3991 jlong user_time;
3992
3993 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3994 return -1;
3995 }
3996
3997 return user_sys_cpu_time ? sys_time + user_time : user_time;
3998 }
3999
4000 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4001 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4002 info_ptr->may_skip_backward = false; // elapsed time not wall time
4003 info_ptr->may_skip_forward = false; // elapsed time not wall time
4004 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4005 }
4006
4007 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4008 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4009 info_ptr->may_skip_backward = false; // elapsed time not wall time
4010 info_ptr->may_skip_forward = false; // elapsed time not wall time
4011 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4012 }
4013
4014 bool os::is_thread_cpu_time_supported() {
4015 return true;
4016 }
4017
4018 // System loadavg support. Returns -1 if load average cannot be obtained.
4019 // For now just return the system wide load average (no processor sets).
4020 int os::loadavg(double values[], int nelem) {
4021
4022 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4023 guarantee(values, "argument error");
4024
4025 if (os::Aix::on_pase()) {
4026
4027 // AS/400 PASE: use libo4 porting library
4028 double v[3] = { 0.0, 0.0, 0.0 };
4029
4030 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4031 for (int i = 0; i < nelem; i ++) {
4032 values[i] = v[i];
4033 }
4034 return nelem;
4035 } else {
4036 return -1;
4037 }
4038
4039 } else {
4040
4041 // AIX: use libperfstat
4042 libperfstat::cpuinfo_t ci;
4043 if (libperfstat::get_cpuinfo(&ci)) {
4044 for (int i = 0; i < nelem; i++) {
4045 values[i] = ci.loadavg[i];
4046 }
4047 } else {
4048 return -1;
4049 }
4050 return nelem;
4051 }
4052 }
4053
4054 void os::pause() {
4055 char filename[MAX_PATH];
4056 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4057 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4058 } else {
4059 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4060 }
4061
4062 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4063 if (fd != -1) {
4064 struct stat buf;
4065 ::close(fd);
4066 while (::stat(filename, &buf) == 0) {
4067 (void)::poll(NULL, 0, 100);
4068 }
4069 } else {
4070 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4071 }
4072 }
4073
4074 bool os::is_primordial_thread(void) {
4075 if (pthread_self() == (pthread_t)1) {
4076 return true;
4077 } else {
4078 return false;
4079 }
4080 }
4081
4082 // OS recognitions (PASE/AIX, OS level) call this before calling any
4083 // one of Aix::on_pase(), Aix::os_version() static
4084 void os::Aix::initialize_os_info() {
4085
4086 assert(_on_pase == -1 && _os_version == 0, "already called.");
4087
4088 struct utsname uts;
4089 memset(&uts, 0, sizeof(uts));
4090 strcpy(uts.sysname, "?");
4091 if (::uname(&uts) == -1) {
4092 trcVerbose("uname failed (%d)", errno);
4093 guarantee(0, "Could not determine whether we run on AIX or PASE");
4094 } else {
4095 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4096 "node \"%s\" machine \"%s\"\n",
4097 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4098 const int major = atoi(uts.version);
4099 assert(major > 0, "invalid OS version");
4100 const int minor = atoi(uts.release);
4101 assert(minor > 0, "invalid OS release");
4102 _os_version = (major << 24) | (minor << 16);
4103 char ver_str[20] = {0};
4104 char *name_str = "unknown OS";
4105 if (strcmp(uts.sysname, "OS400") == 0) {
4106 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4107 _on_pase = 1;
4108 if (os_version_short() < 0x0504) {
4109 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4110 assert(false, "OS/400 release too old.");
4111 }
4112 name_str = "OS/400 (pase)";
4113 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4114 } else if (strcmp(uts.sysname, "AIX") == 0) {
4115 // We run on AIX. We do not support versions older than AIX 5.3.
4116 _on_pase = 0;
4117 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4118 odmWrapper::determine_os_kernel_version(&_os_version);
4119 if (os_version_short() < 0x0503) {
4120 trcVerbose("AIX release older than AIX 5.3 not supported.");
4121 assert(false, "AIX release too old.");
4122 }
4123 name_str = "AIX";
4124 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4125 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4126 } else {
4127 assert(false, name_str);
4128 }
4129 trcVerbose("We run on %s %s", name_str, ver_str);
4130 }
4131
4132 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4133 } // end: os::Aix::initialize_os_info()
4134
4135 // Scan environment for important settings which might effect the VM.
4136 // Trace out settings. Warn about invalid settings and/or correct them.
4137 //
4138 // Must run after os::Aix::initialue_os_info().
4139 void os::Aix::scan_environment() {
4140
4141 char* p;
4142 int rc;
4143
4144 // Warn explicity if EXTSHM=ON is used. That switch changes how
4145 // System V shared memory behaves. One effect is that page size of
4146 // shared memory cannot be change dynamically, effectivly preventing
4147 // large pages from working.
4148 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4149 // recommendation is (in OSS notes) to switch it off.
4150 p = ::getenv("EXTSHM");
4151 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4152 if (p && strcasecmp(p, "ON") == 0) {
4153 _extshm = 1;
4154 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4155 if (!AllowExtshm) {
4156 // We allow under certain conditions the user to continue. However, we want this
4157 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4158 // that the VM is not able to allocate 64k pages for the heap.
4159 // We do not want to run with reduced performance.
4160 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4161 }
4162 } else {
4163 _extshm = 0;
4164 }
4165
4166 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4167 // Not tested, not supported.
4168 //
4169 // Note that it might be worth the trouble to test and to require it, if only to
4170 // get useful return codes for mprotect.
4171 //
4172 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4173 // exec() ? before loading the libjvm ? ....)
4174 p = ::getenv("XPG_SUS_ENV");
4175 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4176 if (p && strcmp(p, "ON") == 0) {
4177 _xpg_sus_mode = 1;
4178 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4179 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4180 // clobber address ranges. If we ever want to support that, we have to do some
4181 // testing first.
4182 guarantee(false, "XPG_SUS_ENV=ON not supported");
4183 } else {
4184 _xpg_sus_mode = 0;
4185 }
4186
4187 if (os::Aix::on_pase()) {
4188 p = ::getenv("QIBM_MULTI_THREADED");
4189 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4190 }
4191
4192 p = ::getenv("LDR_CNTRL");
4193 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4194 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4195 if (p && ::strstr(p, "TEXTPSIZE")) {
4196 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4197 "you may experience hangs or crashes on OS/400 V7R1.");
4198 }
4199 }
4200
4201 p = ::getenv("AIXTHREAD_GUARDPAGES");
4202 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4203
4204 } // end: os::Aix::scan_environment()
4205
4206 // PASE: initialize the libo4 library (PASE porting library).
4207 void os::Aix::initialize_libo4() {
4208 guarantee(os::Aix::on_pase(), "OS/400 only.");
4209 if (!libo4::init()) {
4210 trcVerbose("libo4 initialization failed.");
4211 assert(false, "libo4 initialization failed");
4212 } else {
4213 trcVerbose("libo4 initialized.");
4214 }
4215 }
4216
4217 // AIX: initialize the libperfstat library.
4218 void os::Aix::initialize_libperfstat() {
4219 assert(os::Aix::on_aix(), "AIX only");
4220 if (!libperfstat::init()) {
4221 trcVerbose("libperfstat initialization failed.");
4222 assert(false, "libperfstat initialization failed");
4223 } else {
4224 trcVerbose("libperfstat initialized.");
4225 }
4226 }
4227
4228 /////////////////////////////////////////////////////////////////////////////
4229 // thread stack
4230
4231 // Get the current stack base from the OS (actually, the pthread library).
4232 // Note: usually not page aligned.
4233 address os::current_stack_base() {
4234 AixMisc::stackbounds_t bounds;
4235 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4236 guarantee(rc, "Unable to retrieve stack bounds.");
4237 return bounds.base;
4238 }
4239
4240 // Get the current stack size from the OS (actually, the pthread library).
4241 // Returned size is such that (base - size) is always aligned to page size.
4242 size_t os::current_stack_size() {
4243 AixMisc::stackbounds_t bounds;
4244 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4245 guarantee(rc, "Unable to retrieve stack bounds.");
4246 // Align the returned stack size such that the stack low address
4247 // is aligned to page size (Note: base is usually not and we do not care).
4248 // We need to do this because caller code will assume stack low address is
4249 // page aligned and will place guard pages without checking.
4250 address low = bounds.base - bounds.size;
4251 address low_aligned = (address)align_up(low, os::vm_page_size());
4252 size_t s = bounds.base - low_aligned;
4253 return s;
4254 }
4255
4256 extern char** environ;
4257
4258 // Run the specified command in a separate process. Return its exit value,
4259 // or -1 on failure (e.g. can't fork a new process).
4260 // Unlike system(), this function can be called from signal handler. It
4261 // doesn't block SIGINT et al.
4262 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4263 char * argv[4] = {"sh", "-c", cmd, NULL};
4264
4265 pid_t pid = fork();
4266
4267 if (pid < 0) {
4268 // fork failed
4269 return -1;
4270
4271 } else if (pid == 0) {
4272 // child process
4273
4274 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4275 execve("/usr/bin/sh", argv, environ);
4276
4277 // execve failed
4278 _exit(-1);
4279
4280 } else {
4281 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4282 // care about the actual exit code, for now.
4283
4284 int status;
4285
4286 // Wait for the child process to exit. This returns immediately if
4287 // the child has already exited. */
4288 while (waitpid(pid, &status, 0) < 0) {
4289 switch (errno) {
4290 case ECHILD: return 0;
4291 case EINTR: break;
4292 default: return -1;
4293 }
4294 }
4295
4296 if (WIFEXITED(status)) {
4297 // The child exited normally; get its exit code.
4298 return WEXITSTATUS(status);
4299 } else if (WIFSIGNALED(status)) {
4300 // The child exited because of a signal.
4301 // The best value to return is 0x80 + signal number,
4302 // because that is what all Unix shells do, and because
4303 // it allows callers to distinguish between process exit and
4304 // process death by signal.
4305 return 0x80 + WTERMSIG(status);
4306 } else {
4307 // Unknown exit code; pass it through.
4308 return status;
4309 }
4310 }
4311 return -1;
4312 }
4313
4314 // Get the default path to the core file
4315 // Returns the length of the string
4316 int os::get_core_path(char* buffer, size_t bufferSize) {
4317 const char* p = get_current_directory(buffer, bufferSize);
4318
4319 if (p == NULL) {
4320 assert(p != NULL, "failed to get current directory");
4321 return 0;
4322 }
4323
4324 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4325 p, current_process_id());
4326
4327 return strlen(buffer);
4328 }
4329
4330 #ifndef PRODUCT
4331 void TestReserveMemorySpecial_test() {
4332 // No tests available for this platform
4333 }
4334 #endif
4335
4336 bool os::start_debugging(char *buf, int buflen) {
4337 int len = (int)strlen(buf);
4338 char *p = &buf[len];
4339
4340 jio_snprintf(p, buflen -len,
4341 "\n\n"
4342 "Do you want to debug the problem?\n\n"
4343 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4344 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4345 "Otherwise, press RETURN to abort...",
4346 os::current_process_id(),
4347 os::current_thread_id(), thread_self());
4348
4349 bool yes = os::message_box("Unexpected Error", buf);
4350
4351 if (yes) {
4352 // yes, user asked VM to launch debugger
4353 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4354
4355 os::fork_and_exec(buf);
4356 yes = false;
4357 }
4358 return yes;
4359 }
4360
4361 static inline time_t get_mtime(const char* filename) {
4362 struct stat st;
4363 int ret = os::stat(filename, &st);
4364 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4365 return st.st_mtime;
4366 }
4367
4368 int os::compare_file_modified_times(const char* file1, const char* file2) {
4369 time_t t1 = get_mtime(file1);
4370 time_t t2 = get_mtime(file2);
4371 return t1 - t2;
4372 }