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.inline.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 set_boot_path('/', ':');
580 }
581
582 // Where to look for native libraries.
583
584 // On Aix we get the user setting of LIBPATH.
585 // Eventually, all the library path setting will be done here.
586 // Get the user setting of LIBPATH.
587 const char *v = ::getenv("LIBPATH");
588 const char *v_colon = ":";
589 if (v == NULL) { v = ""; v_colon = ""; }
590
591 // Concatenate user and invariant part of ld_library_path.
592 // That's +1 for the colon and +1 for the trailing '\0'.
593 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
594 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
595 Arguments::set_library_path(ld_library_path);
596 FREE_C_HEAP_ARRAY(char, ld_library_path);
597
598 // Extensions directories.
599 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
600 Arguments::set_ext_dirs(buf);
601
602 FREE_C_HEAP_ARRAY(char, buf);
603
604 #undef DEFAULT_LIBPATH
605 #undef EXTENSIONS_DIR
606 }
607
608 ////////////////////////////////////////////////////////////////////////////////
609 // breakpoint support
610
611 void os::breakpoint() {
612 BREAKPOINT;
613 }
614
615 extern "C" void breakpoint() {
616 // use debugger to set breakpoint here
617 }
618
619 ////////////////////////////////////////////////////////////////////////////////
620 // signal support
621
622 debug_only(static bool signal_sets_initialized = false);
623 static sigset_t unblocked_sigs, vm_sigs;
624
625 bool os::Aix::is_sig_ignored(int sig) {
626 struct sigaction oact;
627 sigaction(sig, (struct sigaction*)NULL, &oact);
628 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
629 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
630 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
631 return true;
632 } else {
633 return false;
634 }
635 }
636
637 void os::Aix::signal_sets_init() {
638 // Should also have an assertion stating we are still single-threaded.
639 assert(!signal_sets_initialized, "Already initialized");
640 // Fill in signals that are necessarily unblocked for all threads in
641 // the VM. Currently, we unblock the following signals:
642 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
643 // by -Xrs (=ReduceSignalUsage));
644 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
645 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
646 // the dispositions or masks wrt these signals.
647 // Programs embedding the VM that want to use the above signals for their
648 // own purposes must, at this time, use the "-Xrs" option to prevent
649 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
650 // (See bug 4345157, and other related bugs).
651 // In reality, though, unblocking these signals is really a nop, since
652 // these signals are not blocked by default.
653 sigemptyset(&unblocked_sigs);
654 sigaddset(&unblocked_sigs, SIGILL);
655 sigaddset(&unblocked_sigs, SIGSEGV);
656 sigaddset(&unblocked_sigs, SIGBUS);
657 sigaddset(&unblocked_sigs, SIGFPE);
658 sigaddset(&unblocked_sigs, SIGTRAP);
659 sigaddset(&unblocked_sigs, SR_signum);
660
661 if (!ReduceSignalUsage) {
662 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
663 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
664 }
665 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
666 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
667 }
668 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
669 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
670 }
671 }
672 // Fill in signals that are blocked by all but the VM thread.
673 sigemptyset(&vm_sigs);
674 if (!ReduceSignalUsage)
675 sigaddset(&vm_sigs, BREAK_SIGNAL);
676 debug_only(signal_sets_initialized = true);
677 }
678
679 // These are signals that are unblocked while a thread is running Java.
680 // (For some reason, they get blocked by default.)
681 sigset_t* os::Aix::unblocked_signals() {
682 assert(signal_sets_initialized, "Not initialized");
683 return &unblocked_sigs;
684 }
685
686 // These are the signals that are blocked while a (non-VM) thread is
687 // running Java. Only the VM thread handles these signals.
688 sigset_t* os::Aix::vm_signals() {
689 assert(signal_sets_initialized, "Not initialized");
690 return &vm_sigs;
691 }
692
693 void os::Aix::hotspot_sigmask(Thread* thread) {
694
695 //Save caller's signal mask before setting VM signal mask
696 sigset_t caller_sigmask;
697 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
698
699 OSThread* osthread = thread->osthread();
700 osthread->set_caller_sigmask(caller_sigmask);
701
702 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
703
704 if (!ReduceSignalUsage) {
705 if (thread->is_VM_thread()) {
706 // Only the VM thread handles BREAK_SIGNAL ...
707 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
708 } else {
709 // ... all other threads block BREAK_SIGNAL
710 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
711 }
712 }
713 }
714
715 // retrieve memory information.
716 // Returns false if something went wrong;
717 // content of pmi undefined in this case.
718 bool os::Aix::get_meminfo(meminfo_t* pmi) {
719
720 assert(pmi, "get_meminfo: invalid parameter");
721
722 memset(pmi, 0, sizeof(meminfo_t));
723
724 if (os::Aix::on_pase()) {
725 // On PASE, use the libo4 porting library.
726
727 unsigned long long virt_total = 0;
728 unsigned long long real_total = 0;
729 unsigned long long real_free = 0;
730 unsigned long long pgsp_total = 0;
731 unsigned long long pgsp_free = 0;
732 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
733 pmi->virt_total = virt_total;
734 pmi->real_total = real_total;
735 pmi->real_free = real_free;
736 pmi->pgsp_total = pgsp_total;
737 pmi->pgsp_free = pgsp_free;
738 return true;
739 }
740 return false;
741
742 } else {
743
744 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
745 // See:
746 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
747 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
748 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
749 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
750
751 perfstat_memory_total_t psmt;
752 memset (&psmt, '\0', sizeof(psmt));
753 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
754 if (rc == -1) {
755 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
756 assert(0, "perfstat_memory_total() failed");
757 return false;
758 }
759
760 assert(rc == 1, "perfstat_memory_total() - weird return code");
761
762 // excerpt from
763 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
764 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
765 // The fields of perfstat_memory_total_t:
766 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
767 // u_longlong_t real_total Total real memory (in 4 KB pages).
768 // u_longlong_t real_free Free real memory (in 4 KB pages).
769 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
770 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
771
772 pmi->virt_total = psmt.virt_total * 4096;
773 pmi->real_total = psmt.real_total * 4096;
774 pmi->real_free = psmt.real_free * 4096;
775 pmi->pgsp_total = psmt.pgsp_total * 4096;
776 pmi->pgsp_free = psmt.pgsp_free * 4096;
777
778 return true;
779
780 }
781 } // end os::Aix::get_meminfo
782
783 //////////////////////////////////////////////////////////////////////////////
784 // create new thread
785
786 // Thread start routine for all newly created threads
787 static void *thread_native_entry(Thread *thread) {
788
789 // find out my own stack dimensions
790 {
791 // actually, this should do exactly the same as thread->record_stack_base_and_size...
792 thread->set_stack_base(os::current_stack_base());
793 thread->set_stack_size(os::current_stack_size());
794 }
795
796 const pthread_t pthread_id = ::pthread_self();
797 const tid_t kernel_thread_id = ::thread_self();
798
799 LogTarget(Info, os, thread) lt;
800 if (lt.is_enabled()) {
801 address low_address = thread->stack_end();
802 address high_address = thread->stack_base();
803 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
804 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
805 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
806 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
807 }
808
809 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
810 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
811 // tools hook pthread_create(). In this case, we may run into problems establishing
812 // guard pages on those stacks, because the stacks may reside in memory which is not
813 // protectable (shmated).
814 if (thread->stack_base() > ::sbrk(0)) {
815 log_warning(os, thread)("Thread stack not in data segment.");
816 }
817
818 // Try to randomize the cache line index of hot stack frames.
819 // This helps when threads of the same stack traces evict each other's
820 // cache lines. The threads can be either from the same JVM instance, or
821 // from different JVM instances. The benefit is especially true for
822 // processors with hyperthreading technology.
823
824 static int counter = 0;
825 int pid = os::current_process_id();
826 alloca(((pid ^ counter++) & 7) * 128);
827
828 thread->initialize_thread_current();
829
830 OSThread* osthread = thread->osthread();
831
832 // Thread_id is pthread id.
833 osthread->set_thread_id(pthread_id);
834
835 // .. but keep kernel thread id too for diagnostics
836 osthread->set_kernel_thread_id(kernel_thread_id);
837
838 // Initialize signal mask for this thread.
839 os::Aix::hotspot_sigmask(thread);
840
841 // Initialize floating point control register.
842 os::Aix::init_thread_fpu_state();
843
844 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
845
846 // Call one more level start routine.
847 thread->run();
848
849 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
850 os::current_thread_id(), (uintx) kernel_thread_id);
851
852 // If a thread has not deleted itself ("delete this") as part of its
853 // termination sequence, we have to ensure thread-local-storage is
854 // cleared before we actually terminate. No threads should ever be
855 // deleted asynchronously with respect to their termination.
856 if (Thread::current_or_null_safe() != NULL) {
857 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
858 thread->clear_thread_current();
859 }
860
861 return 0;
862 }
863
864 bool os::create_thread(Thread* thread, ThreadType thr_type,
865 size_t req_stack_size) {
866
867 assert(thread->osthread() == NULL, "caller responsible");
868
869 // Allocate the OSThread object.
870 OSThread* osthread = new OSThread(NULL, NULL);
871 if (osthread == NULL) {
872 return false;
873 }
874
875 // Set the correct thread state.
876 osthread->set_thread_type(thr_type);
877
878 // Initial state is ALLOCATED but not INITIALIZED
879 osthread->set_state(ALLOCATED);
880
881 thread->set_osthread(osthread);
882
883 // Init thread attributes.
884 pthread_attr_t attr;
885 pthread_attr_init(&attr);
886 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
887
888 // Make sure we run in 1:1 kernel-user-thread mode.
889 if (os::Aix::on_aix()) {
890 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
891 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
892 }
893
894 // Start in suspended state, and in os::thread_start, wake the thread up.
895 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
896
897 // Calculate stack size if it's not specified by caller.
898 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
899
900 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
901 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
902 // This very much looks like a pthread lib error. As a workaround, increase the stack size
903 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
904 if (stack_size < 4096 * K) {
905 stack_size += 64 * K;
906 }
907
908 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
909 // thread size in attr unchanged. If this is the minimal stack size as set
910 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
911 // guard pages might not fit on the tiny stack created.
912 int ret = pthread_attr_setstacksize(&attr, stack_size);
913 if (ret != 0) {
914 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
915 stack_size / K);
916 }
917
918 // Save some cycles and a page by disabling OS guard pages where we have our own
919 // VM guard pages (in java threads). For other threads, keep system default guard
920 // pages in place.
921 if (thr_type == java_thread || thr_type == compiler_thread) {
922 ret = pthread_attr_setguardsize(&attr, 0);
923 }
924
925 pthread_t tid = 0;
926 if (ret == 0) {
927 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
928 }
929
930 if (ret == 0) {
931 char buf[64];
932 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
933 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
934 } else {
935 char buf[64];
936 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
937 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
938 }
939
940 pthread_attr_destroy(&attr);
941
942 if (ret != 0) {
943 // Need to clean up stuff we've allocated so far.
944 thread->set_osthread(NULL);
945 delete osthread;
946 return false;
947 }
948
949 // OSThread::thread_id is the pthread id.
950 osthread->set_thread_id(tid);
951
952 return true;
953 }
954
955 /////////////////////////////////////////////////////////////////////////////
956 // attach existing thread
957
958 // bootstrap the main thread
959 bool os::create_main_thread(JavaThread* thread) {
960 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
961 return create_attached_thread(thread);
962 }
963
964 bool os::create_attached_thread(JavaThread* thread) {
965 #ifdef ASSERT
966 thread->verify_not_published();
967 #endif
968
969 // Allocate the OSThread object
970 OSThread* osthread = new OSThread(NULL, NULL);
971
972 if (osthread == NULL) {
973 return false;
974 }
975
976 const pthread_t pthread_id = ::pthread_self();
977 const tid_t kernel_thread_id = ::thread_self();
978
979 // OSThread::thread_id is the pthread id.
980 osthread->set_thread_id(pthread_id);
981
982 // .. but keep kernel thread id too for diagnostics
983 osthread->set_kernel_thread_id(kernel_thread_id);
984
985 // initialize floating point control register
986 os::Aix::init_thread_fpu_state();
987
988 // Initial thread state is RUNNABLE
989 osthread->set_state(RUNNABLE);
990
991 thread->set_osthread(osthread);
992
993 if (UseNUMA) {
994 int lgrp_id = os::numa_get_group_id();
995 if (lgrp_id != -1) {
996 thread->set_lgrp_id(lgrp_id);
997 }
998 }
999
1000 // initialize signal mask for this thread
1001 // and save the caller's signal mask
1002 os::Aix::hotspot_sigmask(thread);
1003
1004 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
1005 os::current_thread_id(), (uintx) kernel_thread_id);
1006
1007 return true;
1008 }
1009
1010 void os::pd_start_thread(Thread* thread) {
1011 int status = pthread_continue_np(thread->osthread()->pthread_id());
1012 assert(status == 0, "thr_continue failed");
1013 }
1014
1015 // Free OS resources related to the OSThread
1016 void os::free_thread(OSThread* osthread) {
1017 assert(osthread != NULL, "osthread not set");
1018
1019 // We are told to free resources of the argument thread,
1020 // but we can only really operate on the current thread.
1021 assert(Thread::current()->osthread() == osthread,
1022 "os::free_thread but not current thread");
1023
1024 // Restore caller's signal mask
1025 sigset_t sigmask = osthread->caller_sigmask();
1026 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1027
1028 delete osthread;
1029 }
1030
1031 ////////////////////////////////////////////////////////////////////////////////
1032 // time support
1033
1034 // Time since start-up in seconds to a fine granularity.
1035 // Used by VMSelfDestructTimer and the MemProfiler.
1036 double os::elapsedTime() {
1037 return (double)(os::elapsed_counter()) * 0.000001;
1038 }
1039
1040 jlong os::elapsed_counter() {
1041 timeval time;
1042 int status = gettimeofday(&time, NULL);
1043 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1044 }
1045
1046 jlong os::elapsed_frequency() {
1047 return (1000 * 1000);
1048 }
1049
1050 bool os::supports_vtime() { return true; }
1051 bool os::enable_vtime() { return false; }
1052 bool os::vtime_enabled() { return false; }
1053
1054 double os::elapsedVTime() {
1055 struct rusage usage;
1056 int retval = getrusage(RUSAGE_THREAD, &usage);
1057 if (retval == 0) {
1058 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1059 } else {
1060 // better than nothing, but not much
1061 return elapsedTime();
1062 }
1063 }
1064
1065 jlong os::javaTimeMillis() {
1066 timeval time;
1067 int status = gettimeofday(&time, NULL);
1068 assert(status != -1, "aix error at gettimeofday()");
1069 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1070 }
1071
1072 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1073 timeval time;
1074 int status = gettimeofday(&time, NULL);
1075 assert(status != -1, "aix error at gettimeofday()");
1076 seconds = jlong(time.tv_sec);
1077 nanos = jlong(time.tv_usec) * 1000;
1078 }
1079
1080 // We use mread_real_time here.
1081 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1082 // it has to be converted to real time. AIX documentations suggests to do
1083 // this unconditionally, so we do it.
1084 //
1085 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1086 //
1087 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1088 // conversion is necessary. However, mread_real_time will not return
1089 // monotonic results but merely matches read_real_time. So we need a tweak
1090 // to ensure monotonic results.
1091 //
1092 // For PASE no public documentation exists, just word by IBM
1093 jlong os::javaTimeNanos() {
1094 timebasestruct_t time;
1095 int rc = mread_real_time(&time, TIMEBASE_SZ);
1096 if (os::Aix::on_pase()) {
1097 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1098 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1099 jlong prev = max_real_time;
1100 if (now <= prev) {
1101 return prev; // same or retrograde time;
1102 }
1103 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1104 assert(obsv >= prev, "invariant"); // Monotonicity
1105 // If the CAS succeeded then we're done and return "now".
1106 // If the CAS failed and the observed value "obsv" is >= now then
1107 // we should return "obsv". If the CAS failed and now > obsv > prv then
1108 // some other thread raced this thread and installed a new value, in which case
1109 // we could either (a) retry the entire operation, (b) retry trying to install now
1110 // or (c) just return obsv. We use (c). No loop is required although in some cases
1111 // we might discard a higher "now" value in deference to a slightly lower but freshly
1112 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1113 // to (a) or (b) -- and greatly reduces coherence traffic.
1114 // We might also condition (c) on the magnitude of the delta between obsv and now.
1115 // Avoiding excessive CAS operations to hot RW locations is critical.
1116 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1117 return (prev == obsv) ? now : obsv;
1118 } else {
1119 if (rc != RTC_POWER) {
1120 rc = time_base_to_time(&time, TIMEBASE_SZ);
1121 assert(rc != -1, "error calling time_base_to_time()");
1122 }
1123 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1124 }
1125 }
1126
1127 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1128 info_ptr->max_value = ALL_64_BITS;
1129 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1130 info_ptr->may_skip_backward = false;
1131 info_ptr->may_skip_forward = false;
1132 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1133 }
1134
1135 // Return the real, user, and system times in seconds from an
1136 // arbitrary fixed point in the past.
1137 bool os::getTimesSecs(double* process_real_time,
1138 double* process_user_time,
1139 double* process_system_time) {
1140 struct tms ticks;
1141 clock_t real_ticks = times(&ticks);
1142
1143 if (real_ticks == (clock_t) (-1)) {
1144 return false;
1145 } else {
1146 double ticks_per_second = (double) clock_tics_per_sec;
1147 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1148 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1149 *process_real_time = ((double) real_ticks) / ticks_per_second;
1150
1151 return true;
1152 }
1153 }
1154
1155 char * os::local_time_string(char *buf, size_t buflen) {
1156 struct tm t;
1157 time_t long_time;
1158 time(&long_time);
1159 localtime_r(&long_time, &t);
1160 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1161 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1162 t.tm_hour, t.tm_min, t.tm_sec);
1163 return buf;
1164 }
1165
1166 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1167 return localtime_r(clock, res);
1168 }
1169
1170 ////////////////////////////////////////////////////////////////////////////////
1171 // runtime exit support
1172
1173 // Note: os::shutdown() might be called very early during initialization, or
1174 // called from signal handler. Before adding something to os::shutdown(), make
1175 // sure it is async-safe and can handle partially initialized VM.
1176 void os::shutdown() {
1177
1178 // allow PerfMemory to attempt cleanup of any persistent resources
1179 perfMemory_exit();
1180
1181 // needs to remove object in file system
1182 AttachListener::abort();
1183
1184 // flush buffered output, finish log files
1185 ostream_abort();
1186
1187 // Check for abort hook
1188 abort_hook_t abort_hook = Arguments::abort_hook();
1189 if (abort_hook != NULL) {
1190 abort_hook();
1191 }
1192 }
1193
1194 // Note: os::abort() might be called very early during initialization, or
1195 // called from signal handler. Before adding something to os::abort(), make
1196 // sure it is async-safe and can handle partially initialized VM.
1197 void os::abort(bool dump_core, void* siginfo, const void* context) {
1198 os::shutdown();
1199 if (dump_core) {
1200 #ifndef PRODUCT
1201 fdStream out(defaultStream::output_fd());
1202 out.print_raw("Current thread is ");
1203 char buf[16];
1204 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1205 out.print_raw_cr(buf);
1206 out.print_raw_cr("Dumping core ...");
1207 #endif
1208 ::abort(); // dump core
1209 }
1210
1211 ::exit(1);
1212 }
1213
1214 // Die immediately, no exit hook, no abort hook, no cleanup.
1215 void os::die() {
1216 ::abort();
1217 }
1218
1219 // This method is a copy of JDK's sysGetLastErrorString
1220 // from src/solaris/hpi/src/system_md.c
1221
1222 size_t os::lasterror(char *buf, size_t len) {
1223 if (errno == 0) return 0;
1224
1225 const char *s = os::strerror(errno);
1226 size_t n = ::strlen(s);
1227 if (n >= len) {
1228 n = len - 1;
1229 }
1230 ::strncpy(buf, s, n);
1231 buf[n] = '\0';
1232 return n;
1233 }
1234
1235 intx os::current_thread_id() {
1236 return (intx)pthread_self();
1237 }
1238
1239 int os::current_process_id() {
1240 return getpid();
1241 }
1242
1243 // DLL functions
1244
1245 const char* os::dll_file_extension() { return ".so"; }
1246
1247 // This must be hard coded because it's the system's temporary
1248 // directory not the java application's temp directory, ala java.io.tmpdir.
1249 const char* os::get_temp_directory() { return "/tmp"; }
1250
1251 // Check if addr is inside libjvm.so.
1252 bool os::address_is_in_vm(address addr) {
1253
1254 // Input could be a real pc or a function pointer literal. The latter
1255 // would be a function descriptor residing in the data segment of a module.
1256 loaded_module_t lm;
1257 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1258 return lm.is_in_vm;
1259 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1260 return lm.is_in_vm;
1261 } else {
1262 return false;
1263 }
1264
1265 }
1266
1267 // Resolve an AIX function descriptor literal to a code pointer.
1268 // If the input is a valid code pointer to a text segment of a loaded module,
1269 // it is returned unchanged.
1270 // If the input is a valid AIX function descriptor, it is resolved to the
1271 // code entry point.
1272 // If the input is neither a valid function descriptor nor a valid code pointer,
1273 // NULL is returned.
1274 static address resolve_function_descriptor_to_code_pointer(address p) {
1275
1276 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1277 // It is a real code pointer.
1278 return p;
1279 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1280 // Pointer to data segment, potential function descriptor.
1281 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1282 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1283 // It is a function descriptor.
1284 return code_entry;
1285 }
1286 }
1287
1288 return NULL;
1289 }
1290
1291 bool os::dll_address_to_function_name(address addr, char *buf,
1292 int buflen, int *offset,
1293 bool demangle) {
1294 if (offset) {
1295 *offset = -1;
1296 }
1297 // Buf is not optional, but offset is optional.
1298 assert(buf != NULL, "sanity check");
1299 buf[0] = '\0';
1300
1301 // Resolve function ptr literals first.
1302 addr = resolve_function_descriptor_to_code_pointer(addr);
1303 if (!addr) {
1304 return false;
1305 }
1306
1307 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1308 }
1309
1310 bool os::dll_address_to_library_name(address addr, char* buf,
1311 int buflen, int* offset) {
1312 if (offset) {
1313 *offset = -1;
1314 }
1315 // Buf is not optional, but offset is optional.
1316 assert(buf != NULL, "sanity check");
1317 buf[0] = '\0';
1318
1319 // Resolve function ptr literals first.
1320 addr = resolve_function_descriptor_to_code_pointer(addr);
1321 if (!addr) {
1322 return false;
1323 }
1324
1325 return AixSymbols::get_module_name(addr, buf, buflen);
1326 }
1327
1328 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1329 // for the same architecture as Hotspot is running on.
1330 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1331
1332 if (ebuf && ebuflen > 0) {
1333 ebuf[0] = '\0';
1334 ebuf[ebuflen - 1] = '\0';
1335 }
1336
1337 if (!filename || strlen(filename) == 0) {
1338 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1339 return NULL;
1340 }
1341
1342 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1343 void * result= ::dlopen(filename, RTLD_LAZY);
1344 if (result != NULL) {
1345 // Reload dll cache. Don't do this in signal handling.
1346 LoadedLibraries::reload();
1347 return result;
1348 } else {
1349 // error analysis when dlopen fails
1350 const char* const error_report = ::dlerror();
1351 if (error_report && ebuf && ebuflen > 0) {
1352 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1353 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1354 }
1355 }
1356 return NULL;
1357 }
1358
1359 void* os::dll_lookup(void* handle, const char* name) {
1360 void* res = dlsym(handle, name);
1361 return res;
1362 }
1363
1364 void* os::get_default_process_handle() {
1365 return (void*)::dlopen(NULL, RTLD_LAZY);
1366 }
1367
1368 void os::print_dll_info(outputStream *st) {
1369 st->print_cr("Dynamic libraries:");
1370 LoadedLibraries::print(st);
1371 }
1372
1373 void os::get_summary_os_info(char* buf, size_t buflen) {
1374 // There might be something more readable than uname results for AIX.
1375 struct utsname name;
1376 uname(&name);
1377 snprintf(buf, buflen, "%s %s", name.release, name.version);
1378 }
1379
1380 void os::print_os_info(outputStream* st) {
1381 st->print("OS:");
1382
1383 st->print("uname:");
1384 struct utsname name;
1385 uname(&name);
1386 st->print(name.sysname); st->print(" ");
1387 st->print(name.nodename); st->print(" ");
1388 st->print(name.release); st->print(" ");
1389 st->print(name.version); st->print(" ");
1390 st->print(name.machine);
1391 st->cr();
1392
1393 uint32_t ver = os::Aix::os_version();
1394 st->print_cr("AIX kernel version %u.%u.%u.%u",
1395 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1396
1397 os::Posix::print_rlimit_info(st);
1398
1399 // load average
1400 st->print("load average:");
1401 double loadavg[3] = {-1.L, -1.L, -1.L};
1402 os::loadavg(loadavg, 3);
1403 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1404 st->cr();
1405
1406 // print wpar info
1407 libperfstat::wparinfo_t wi;
1408 if (libperfstat::get_wparinfo(&wi)) {
1409 st->print_cr("wpar info");
1410 st->print_cr("name: %s", wi.name);
1411 st->print_cr("id: %d", wi.wpar_id);
1412 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1413 }
1414
1415 // print partition info
1416 libperfstat::partitioninfo_t pi;
1417 if (libperfstat::get_partitioninfo(&pi)) {
1418 st->print_cr("partition info");
1419 st->print_cr(" name: %s", pi.name);
1420 }
1421
1422 }
1423
1424 void os::print_memory_info(outputStream* st) {
1425
1426 st->print_cr("Memory:");
1427
1428 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1429 describe_pagesize(g_multipage_support.pagesize));
1430 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1431 describe_pagesize(g_multipage_support.datapsize));
1432 st->print_cr(" Text page size: %s",
1433 describe_pagesize(g_multipage_support.textpsize));
1434 st->print_cr(" Thread stack page size (pthread): %s",
1435 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1436 st->print_cr(" Default shared memory page size: %s",
1437 describe_pagesize(g_multipage_support.shmpsize));
1438 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1439 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1440 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1441 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1442 st->print_cr(" Multipage error: %d",
1443 g_multipage_support.error);
1444 st->cr();
1445 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1446
1447 // print out LDR_CNTRL because it affects the default page sizes
1448 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1449 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1450
1451 // Print out EXTSHM because it is an unsupported setting.
1452 const char* const extshm = ::getenv("EXTSHM");
1453 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1454 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1455 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1456 }
1457
1458 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1459 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1460 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1461 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1462
1463 os::Aix::meminfo_t mi;
1464 if (os::Aix::get_meminfo(&mi)) {
1465 if (os::Aix::on_aix()) {
1466 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1467 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1468 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1469 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1470 } else {
1471 // PASE - Numbers are result of QWCRSSTS; they mean:
1472 // real_total: Sum of all system pools
1473 // real_free: always 0
1474 // pgsp_total: we take the size of the system ASP
1475 // pgsp_free: size of system ASP times percentage of system ASP unused
1476 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1477 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1478 st->print_cr("%% system asp used : %.2f",
1479 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1480 }
1481 }
1482 st->cr();
1483
1484 // Print segments allocated with os::reserve_memory.
1485 st->print_cr("internal virtual memory regions used by vm:");
1486 vmembk_print_on(st);
1487 }
1488
1489 // Get a string for the cpuinfo that is a summary of the cpu type
1490 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1491 // read _system_configuration.version
1492 switch (_system_configuration.version) {
1493 case PV_8:
1494 strncpy(buf, "Power PC 8", buflen);
1495 break;
1496 case PV_7:
1497 strncpy(buf, "Power PC 7", buflen);
1498 break;
1499 case PV_6_1:
1500 strncpy(buf, "Power PC 6 DD1.x", buflen);
1501 break;
1502 case PV_6:
1503 strncpy(buf, "Power PC 6", buflen);
1504 break;
1505 case PV_5:
1506 strncpy(buf, "Power PC 5", buflen);
1507 break;
1508 case PV_5_2:
1509 strncpy(buf, "Power PC 5_2", buflen);
1510 break;
1511 case PV_5_3:
1512 strncpy(buf, "Power PC 5_3", buflen);
1513 break;
1514 case PV_5_Compat:
1515 strncpy(buf, "PV_5_Compat", buflen);
1516 break;
1517 case PV_6_Compat:
1518 strncpy(buf, "PV_6_Compat", buflen);
1519 break;
1520 case PV_7_Compat:
1521 strncpy(buf, "PV_7_Compat", buflen);
1522 break;
1523 case PV_8_Compat:
1524 strncpy(buf, "PV_8_Compat", buflen);
1525 break;
1526 default:
1527 strncpy(buf, "unknown", buflen);
1528 }
1529 }
1530
1531 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1532 // Nothing to do beyond of what os::print_cpu_info() does.
1533 }
1534
1535 static void print_signal_handler(outputStream* st, int sig,
1536 char* buf, size_t buflen);
1537
1538 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1539 st->print_cr("Signal Handlers:");
1540 print_signal_handler(st, SIGSEGV, buf, buflen);
1541 print_signal_handler(st, SIGBUS , buf, buflen);
1542 print_signal_handler(st, SIGFPE , buf, buflen);
1543 print_signal_handler(st, SIGPIPE, buf, buflen);
1544 print_signal_handler(st, SIGXFSZ, buf, buflen);
1545 print_signal_handler(st, SIGILL , buf, buflen);
1546 print_signal_handler(st, SR_signum, buf, buflen);
1547 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1548 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1549 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1550 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1551 print_signal_handler(st, SIGTRAP, buf, buflen);
1552 // We also want to know if someone else adds a SIGDANGER handler because
1553 // that will interfere with OOM killling.
1554 print_signal_handler(st, SIGDANGER, buf, buflen);
1555 }
1556
1557 static char saved_jvm_path[MAXPATHLEN] = {0};
1558
1559 // Find the full path to the current module, libjvm.so.
1560 void os::jvm_path(char *buf, jint buflen) {
1561 // Error checking.
1562 if (buflen < MAXPATHLEN) {
1563 assert(false, "must use a large-enough buffer");
1564 buf[0] = '\0';
1565 return;
1566 }
1567 // Lazy resolve the path to current module.
1568 if (saved_jvm_path[0] != 0) {
1569 strcpy(buf, saved_jvm_path);
1570 return;
1571 }
1572
1573 Dl_info dlinfo;
1574 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1575 assert(ret != 0, "cannot locate libjvm");
1576 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1577 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1578
1579 if (Arguments::sun_java_launcher_is_altjvm()) {
1580 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1581 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1582 // If "/jre/lib/" appears at the right place in the string, then
1583 // assume we are installed in a JDK and we're done. Otherwise, check
1584 // for a JAVA_HOME environment variable and fix up the path so it
1585 // looks like libjvm.so is installed there (append a fake suffix
1586 // hotspot/libjvm.so).
1587 const char *p = buf + strlen(buf) - 1;
1588 for (int count = 0; p > buf && count < 4; ++count) {
1589 for (--p; p > buf && *p != '/'; --p)
1590 /* empty */ ;
1591 }
1592
1593 if (strncmp(p, "/jre/lib/", 9) != 0) {
1594 // Look for JAVA_HOME in the environment.
1595 char* java_home_var = ::getenv("JAVA_HOME");
1596 if (java_home_var != NULL && java_home_var[0] != 0) {
1597 char* jrelib_p;
1598 int len;
1599
1600 // Check the current module name "libjvm.so".
1601 p = strrchr(buf, '/');
1602 if (p == NULL) {
1603 return;
1604 }
1605 assert(strstr(p, "/libjvm") == p, "invalid library name");
1606
1607 rp = os::Posix::realpath(java_home_var, buf, buflen);
1608 if (rp == NULL) {
1609 return;
1610 }
1611
1612 // determine if this is a legacy image or modules image
1613 // modules image doesn't have "jre" subdirectory
1614 len = strlen(buf);
1615 assert(len < buflen, "Ran out of buffer room");
1616 jrelib_p = buf + len;
1617 snprintf(jrelib_p, buflen-len, "/jre/lib");
1618 if (0 != access(buf, F_OK)) {
1619 snprintf(jrelib_p, buflen-len, "/lib");
1620 }
1621
1622 if (0 == access(buf, F_OK)) {
1623 // Use current module name "libjvm.so"
1624 len = strlen(buf);
1625 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1626 } else {
1627 // Go back to path of .so
1628 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1629 if (rp == NULL) {
1630 return;
1631 }
1632 }
1633 }
1634 }
1635 }
1636
1637 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1638 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1639 }
1640
1641 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1642 // no prefix required, not even "_"
1643 }
1644
1645 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1646 // no suffix required
1647 }
1648
1649 ////////////////////////////////////////////////////////////////////////////////
1650 // sun.misc.Signal support
1651
1652 static volatile jint sigint_count = 0;
1653
1654 static void
1655 UserHandler(int sig, void *siginfo, void *context) {
1656 // 4511530 - sem_post is serialized and handled by the manager thread. When
1657 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1658 // don't want to flood the manager thread with sem_post requests.
1659 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1660 return;
1661
1662 // Ctrl-C is pressed during error reporting, likely because the error
1663 // handler fails to abort. Let VM die immediately.
1664 if (sig == SIGINT && VMError::is_error_reported()) {
1665 os::die();
1666 }
1667
1668 os::signal_notify(sig);
1669 }
1670
1671 void* os::user_handler() {
1672 return CAST_FROM_FN_PTR(void*, UserHandler);
1673 }
1674
1675 extern "C" {
1676 typedef void (*sa_handler_t)(int);
1677 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1678 }
1679
1680 void* os::signal(int signal_number, void* handler) {
1681 struct sigaction sigAct, oldSigAct;
1682
1683 sigfillset(&(sigAct.sa_mask));
1684
1685 // Do not block out synchronous signals in the signal handler.
1686 // Blocking synchronous signals only makes sense if you can really
1687 // be sure that those signals won't happen during signal handling,
1688 // when the blocking applies. Normal signal handlers are lean and
1689 // do not cause signals. But our signal handlers tend to be "risky"
1690 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1691 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1692 // by a SIGILL, which was blocked due to the signal mask. The process
1693 // just hung forever. Better to crash from a secondary signal than to hang.
1694 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1695 sigdelset(&(sigAct.sa_mask), SIGBUS);
1696 sigdelset(&(sigAct.sa_mask), SIGILL);
1697 sigdelset(&(sigAct.sa_mask), SIGFPE);
1698 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1699
1700 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1701
1702 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1703
1704 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1705 // -1 means registration failed
1706 return (void *)-1;
1707 }
1708
1709 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1710 }
1711
1712 void os::signal_raise(int signal_number) {
1713 ::raise(signal_number);
1714 }
1715
1716 //
1717 // The following code is moved from os.cpp for making this
1718 // code platform specific, which it is by its very nature.
1719 //
1720
1721 // Will be modified when max signal is changed to be dynamic
1722 int os::sigexitnum_pd() {
1723 return NSIG;
1724 }
1725
1726 // a counter for each possible signal value
1727 static volatile jint pending_signals[NSIG+1] = { 0 };
1728
1729 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1730 // On AIX, we use sem_init(), sem_post(), sem_wait()
1731 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1732 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1733 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1734 // on AIX, msem_..() calls are suspected of causing problems.
1735 static sem_t sig_sem;
1736 static msemaphore* p_sig_msem = 0;
1737
1738 static void local_sem_init() {
1739 if (os::Aix::on_aix()) {
1740 int rc = ::sem_init(&sig_sem, 0, 0);
1741 guarantee(rc != -1, "sem_init failed");
1742 } else {
1743 // Memory semaphores must live in shared mem.
1744 guarantee0(p_sig_msem == NULL);
1745 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1746 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1747 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1748 }
1749 }
1750
1751 static void local_sem_post() {
1752 static bool warn_only_once = false;
1753 if (os::Aix::on_aix()) {
1754 int rc = ::sem_post(&sig_sem);
1755 if (rc == -1 && !warn_only_once) {
1756 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1757 warn_only_once = true;
1758 }
1759 } else {
1760 guarantee0(p_sig_msem != NULL);
1761 int rc = ::msem_unlock(p_sig_msem, 0);
1762 if (rc == -1 && !warn_only_once) {
1763 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1764 warn_only_once = true;
1765 }
1766 }
1767 }
1768
1769 static void local_sem_wait() {
1770 static bool warn_only_once = false;
1771 if (os::Aix::on_aix()) {
1772 int rc = ::sem_wait(&sig_sem);
1773 if (rc == -1 && !warn_only_once) {
1774 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1775 warn_only_once = true;
1776 }
1777 } else {
1778 guarantee0(p_sig_msem != NULL); // must init before use
1779 int rc = ::msem_lock(p_sig_msem, 0);
1780 if (rc == -1 && !warn_only_once) {
1781 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1782 warn_only_once = true;
1783 }
1784 }
1785 }
1786
1787 void os::signal_init_pd() {
1788 // Initialize signal structures
1789 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1790
1791 // Initialize signal semaphore
1792 local_sem_init();
1793 }
1794
1795 void os::signal_notify(int sig) {
1796 Atomic::inc(&pending_signals[sig]);
1797 local_sem_post();
1798 }
1799
1800 static int check_pending_signals() {
1801 Atomic::store(0, &sigint_count);
1802 for (;;) {
1803 for (int i = 0; i < NSIG + 1; i++) {
1804 jint n = pending_signals[i];
1805 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1806 return i;
1807 }
1808 }
1809 JavaThread *thread = JavaThread::current();
1810 ThreadBlockInVM tbivm(thread);
1811
1812 bool threadIsSuspended;
1813 do {
1814 thread->set_suspend_equivalent();
1815 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1816
1817 local_sem_wait();
1818
1819 // were we externally suspended while we were waiting?
1820 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1821 if (threadIsSuspended) {
1822 //
1823 // The semaphore has been incremented, but while we were waiting
1824 // another thread suspended us. We don't want to continue running
1825 // while suspended because that would surprise the thread that
1826 // suspended us.
1827 //
1828
1829 local_sem_post();
1830
1831 thread->java_suspend_self();
1832 }
1833 } while (threadIsSuspended);
1834 }
1835 }
1836
1837 int os::signal_wait() {
1838 return check_pending_signals();
1839 }
1840
1841 ////////////////////////////////////////////////////////////////////////////////
1842 // Virtual Memory
1843
1844 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1845
1846 #define VMEM_MAPPED 1
1847 #define VMEM_SHMATED 2
1848
1849 struct vmembk_t {
1850 int type; // 1 - mmap, 2 - shmat
1851 char* addr;
1852 size_t size; // Real size, may be larger than usersize.
1853 size_t pagesize; // page size of area
1854 vmembk_t* next;
1855
1856 bool contains_addr(char* p) const {
1857 return p >= addr && p < (addr + size);
1858 }
1859
1860 bool contains_range(char* p, size_t s) const {
1861 return contains_addr(p) && contains_addr(p + s - 1);
1862 }
1863
1864 void print_on(outputStream* os) const {
1865 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1866 " bytes, %d %s pages), %s",
1867 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1868 (type == VMEM_SHMATED ? "shmat" : "mmap")
1869 );
1870 }
1871
1872 // Check that range is a sub range of memory block (or equal to memory block);
1873 // also check that range is fully page aligned to the page size if the block.
1874 void assert_is_valid_subrange(char* p, size_t s) const {
1875 if (!contains_range(p, s)) {
1876 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1877 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1878 p, p + s, addr, addr + size);
1879 guarantee0(false);
1880 }
1881 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1882 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1883 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1884 guarantee0(false);
1885 }
1886 }
1887 };
1888
1889 static struct {
1890 vmembk_t* first;
1891 MiscUtils::CritSect cs;
1892 } vmem;
1893
1894 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1895 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1896 assert0(p);
1897 if (p) {
1898 MiscUtils::AutoCritSect lck(&vmem.cs);
1899 p->addr = addr; p->size = size;
1900 p->pagesize = pagesize;
1901 p->type = type;
1902 p->next = vmem.first;
1903 vmem.first = p;
1904 }
1905 }
1906
1907 static vmembk_t* vmembk_find(char* addr) {
1908 MiscUtils::AutoCritSect lck(&vmem.cs);
1909 for (vmembk_t* p = vmem.first; p; p = p->next) {
1910 if (p->addr <= addr && (p->addr + p->size) > addr) {
1911 return p;
1912 }
1913 }
1914 return NULL;
1915 }
1916
1917 static void vmembk_remove(vmembk_t* p0) {
1918 MiscUtils::AutoCritSect lck(&vmem.cs);
1919 assert0(p0);
1920 assert0(vmem.first); // List should not be empty.
1921 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1922 if (*pp == p0) {
1923 *pp = p0->next;
1924 ::free(p0);
1925 return;
1926 }
1927 }
1928 assert0(false); // Not found?
1929 }
1930
1931 static void vmembk_print_on(outputStream* os) {
1932 MiscUtils::AutoCritSect lck(&vmem.cs);
1933 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1934 vmi->print_on(os);
1935 os->cr();
1936 }
1937 }
1938
1939 // Reserve and attach a section of System V memory.
1940 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1941 // address. Failing that, it will attach the memory anywhere.
1942 // If <requested_addr> is NULL, function will attach the memory anywhere.
1943 //
1944 // <alignment_hint> is being ignored by this function. It is very probable however that the
1945 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1946 // Should this be not enogh, we can put more work into it.
1947 static char* reserve_shmated_memory (
1948 size_t bytes,
1949 char* requested_addr,
1950 size_t alignment_hint) {
1951
1952 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1953 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1954 bytes, requested_addr, alignment_hint);
1955
1956 // Either give me wish address or wish alignment but not both.
1957 assert0(!(requested_addr != NULL && alignment_hint != 0));
1958
1959 // We must prevent anyone from attaching too close to the
1960 // BRK because that may cause malloc OOM.
1961 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1962 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1963 "Will attach anywhere.", requested_addr);
1964 // Act like the OS refused to attach there.
1965 requested_addr = NULL;
1966 }
1967
1968 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1969 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1970 if (os::Aix::on_pase_V5R4_or_older()) {
1971 ShouldNotReachHere();
1972 }
1973
1974 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1975 const size_t size = align_up(bytes, 64*K);
1976
1977 // Reserve the shared segment.
1978 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1979 if (shmid == -1) {
1980 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1981 return NULL;
1982 }
1983
1984 // Important note:
1985 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1986 // We must right after attaching it remove it from the system. System V shm segments are global and
1987 // survive the process.
1988 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1989
1990 struct shmid_ds shmbuf;
1991 memset(&shmbuf, 0, sizeof(shmbuf));
1992 shmbuf.shm_pagesize = 64*K;
1993 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1994 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1995 size / (64*K), errno);
1996 // I want to know if this ever happens.
1997 assert(false, "failed to set page size for shmat");
1998 }
1999
2000 // Now attach the shared segment.
2001 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2002 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2003 // were not a segment boundary.
2004 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2005 const int errno_shmat = errno;
2006
2007 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2008 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2009 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2010 assert(false, "failed to remove shared memory segment!");
2011 }
2012
2013 // Handle shmat error. If we failed to attach, just return.
2014 if (addr == (char*)-1) {
2015 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2016 return NULL;
2017 }
2018
2019 // Just for info: query the real page size. In case setting the page size did not
2020 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2021 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2022 if (real_pagesize != shmbuf.shm_pagesize) {
2023 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2024 }
2025
2026 if (addr) {
2027 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2028 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2029 } else {
2030 if (requested_addr != NULL) {
2031 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2032 } else {
2033 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2034 }
2035 }
2036
2037 // book-keeping
2038 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2039 assert0(is_aligned_to(addr, os::vm_page_size()));
2040
2041 return addr;
2042 }
2043
2044 static bool release_shmated_memory(char* addr, size_t size) {
2045
2046 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2047 addr, addr + size - 1);
2048
2049 bool rc = false;
2050
2051 // TODO: is there a way to verify shm size without doing bookkeeping?
2052 if (::shmdt(addr) != 0) {
2053 trcVerbose("error (%d).", errno);
2054 } else {
2055 trcVerbose("ok.");
2056 rc = true;
2057 }
2058 return rc;
2059 }
2060
2061 static bool uncommit_shmated_memory(char* addr, size_t size) {
2062 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2063 addr, addr + size - 1);
2064
2065 const bool rc = my_disclaim64(addr, size);
2066
2067 if (!rc) {
2068 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2069 return false;
2070 }
2071 return true;
2072 }
2073
2074 //////////////////////////////// mmap-based routines /////////////////////////////////
2075
2076 // Reserve memory via mmap.
2077 // If <requested_addr> is given, an attempt is made to attach at the given address.
2078 // Failing that, memory is allocated at any address.
2079 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2080 // allocate at an address aligned with the given alignment. Failing that, memory
2081 // is aligned anywhere.
2082 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2083 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2084 "alignment_hint " UINTX_FORMAT "...",
2085 bytes, requested_addr, alignment_hint);
2086
2087 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2088 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2089 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2090 return NULL;
2091 }
2092
2093 // We must prevent anyone from attaching too close to the
2094 // BRK because that may cause malloc OOM.
2095 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2096 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2097 "Will attach anywhere.", requested_addr);
2098 // Act like the OS refused to attach there.
2099 requested_addr = NULL;
2100 }
2101
2102 // Specify one or the other but not both.
2103 assert0(!(requested_addr != NULL && alignment_hint > 0));
2104
2105 // In 64K mode, we claim the global page size (os::vm_page_size())
2106 // is 64K. This is one of the few points where that illusion may
2107 // break, because mmap() will always return memory aligned to 4K. So
2108 // we must ensure we only ever return memory aligned to 64k.
2109 if (alignment_hint) {
2110 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2111 } else {
2112 alignment_hint = os::vm_page_size();
2113 }
2114
2115 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2116 const size_t size = align_up(bytes, os::vm_page_size());
2117
2118 // alignment: Allocate memory large enough to include an aligned range of the right size and
2119 // cut off the leading and trailing waste pages.
2120 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2121 const size_t extra_size = size + alignment_hint;
2122
2123 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2124 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2125 int flags = MAP_ANONYMOUS | MAP_SHARED;
2126
2127 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2128 // it means if wishaddress is given but MAP_FIXED is not set.
2129 //
2130 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2131 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2132 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2133 // get clobbered.
2134 if (requested_addr != NULL) {
2135 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2136 flags |= MAP_FIXED;
2137 }
2138 }
2139
2140 char* addr = (char*)::mmap(requested_addr, extra_size,
2141 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2142
2143 if (addr == MAP_FAILED) {
2144 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2145 return NULL;
2146 }
2147
2148 // Handle alignment.
2149 char* const addr_aligned = align_up(addr, alignment_hint);
2150 const size_t waste_pre = addr_aligned - addr;
2151 char* const addr_aligned_end = addr_aligned + size;
2152 const size_t waste_post = extra_size - waste_pre - size;
2153 if (waste_pre > 0) {
2154 ::munmap(addr, waste_pre);
2155 }
2156 if (waste_post > 0) {
2157 ::munmap(addr_aligned_end, waste_post);
2158 }
2159 addr = addr_aligned;
2160
2161 if (addr) {
2162 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2163 addr, addr + bytes, bytes);
2164 } else {
2165 if (requested_addr != NULL) {
2166 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2167 } else {
2168 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2169 }
2170 }
2171
2172 // bookkeeping
2173 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2174
2175 // Test alignment, see above.
2176 assert0(is_aligned_to(addr, os::vm_page_size()));
2177
2178 return addr;
2179 }
2180
2181 static bool release_mmaped_memory(char* addr, size_t size) {
2182 assert0(is_aligned_to(addr, os::vm_page_size()));
2183 assert0(is_aligned_to(size, os::vm_page_size()));
2184
2185 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2186 addr, addr + size - 1);
2187 bool rc = false;
2188
2189 if (::munmap(addr, size) != 0) {
2190 trcVerbose("failed (%d)\n", errno);
2191 rc = false;
2192 } else {
2193 trcVerbose("ok.");
2194 rc = true;
2195 }
2196
2197 return rc;
2198 }
2199
2200 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2201
2202 assert0(is_aligned_to(addr, os::vm_page_size()));
2203 assert0(is_aligned_to(size, os::vm_page_size()));
2204
2205 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2206 addr, addr + size - 1);
2207 bool rc = false;
2208
2209 // Uncommit mmap memory with msync MS_INVALIDATE.
2210 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2211 trcVerbose("failed (%d)\n", errno);
2212 rc = false;
2213 } else {
2214 trcVerbose("ok.");
2215 rc = true;
2216 }
2217
2218 return rc;
2219 }
2220
2221 int os::vm_page_size() {
2222 // Seems redundant as all get out.
2223 assert(os::Aix::page_size() != -1, "must call os::init");
2224 return os::Aix::page_size();
2225 }
2226
2227 // Aix allocates memory by pages.
2228 int os::vm_allocation_granularity() {
2229 assert(os::Aix::page_size() != -1, "must call os::init");
2230 return os::Aix::page_size();
2231 }
2232
2233 #ifdef PRODUCT
2234 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2235 int err) {
2236 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2237 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2238 os::errno_name(err), err);
2239 }
2240 #endif
2241
2242 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2243 const char* mesg) {
2244 assert(mesg != NULL, "mesg must be specified");
2245 if (!pd_commit_memory(addr, size, exec)) {
2246 // Add extra info in product mode for vm_exit_out_of_memory():
2247 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2248 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2249 }
2250 }
2251
2252 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2253
2254 assert(is_aligned_to(addr, os::vm_page_size()),
2255 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2256 p2i(addr), os::vm_page_size());
2257 assert(is_aligned_to(size, os::vm_page_size()),
2258 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2259 size, os::vm_page_size());
2260
2261 vmembk_t* const vmi = vmembk_find(addr);
2262 guarantee0(vmi);
2263 vmi->assert_is_valid_subrange(addr, size);
2264
2265 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2266
2267 if (UseExplicitCommit) {
2268 // AIX commits memory on touch. So, touch all pages to be committed.
2269 for (char* p = addr; p < (addr + size); p += 4*K) {
2270 *p = '\0';
2271 }
2272 }
2273
2274 return true;
2275 }
2276
2277 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2278 return pd_commit_memory(addr, size, exec);
2279 }
2280
2281 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2282 size_t alignment_hint, bool exec,
2283 const char* mesg) {
2284 // Alignment_hint is ignored on this OS.
2285 pd_commit_memory_or_exit(addr, size, exec, mesg);
2286 }
2287
2288 bool os::pd_uncommit_memory(char* addr, size_t size) {
2289 assert(is_aligned_to(addr, os::vm_page_size()),
2290 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2291 p2i(addr), os::vm_page_size());
2292 assert(is_aligned_to(size, os::vm_page_size()),
2293 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2294 size, os::vm_page_size());
2295
2296 // Dynamically do different things for mmap/shmat.
2297 const vmembk_t* const vmi = vmembk_find(addr);
2298 guarantee0(vmi);
2299 vmi->assert_is_valid_subrange(addr, size);
2300
2301 if (vmi->type == VMEM_SHMATED) {
2302 return uncommit_shmated_memory(addr, size);
2303 } else {
2304 return uncommit_mmaped_memory(addr, size);
2305 }
2306 }
2307
2308 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2309 // Do not call this; no need to commit stack pages on AIX.
2310 ShouldNotReachHere();
2311 return true;
2312 }
2313
2314 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2315 // Do not call this; no need to commit stack pages on AIX.
2316 ShouldNotReachHere();
2317 return true;
2318 }
2319
2320 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2321 }
2322
2323 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2324 }
2325
2326 void os::numa_make_global(char *addr, size_t bytes) {
2327 }
2328
2329 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2330 }
2331
2332 bool os::numa_topology_changed() {
2333 return false;
2334 }
2335
2336 size_t os::numa_get_groups_num() {
2337 return 1;
2338 }
2339
2340 int os::numa_get_group_id() {
2341 return 0;
2342 }
2343
2344 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2345 if (size > 0) {
2346 ids[0] = 0;
2347 return 1;
2348 }
2349 return 0;
2350 }
2351
2352 bool os::get_page_info(char *start, page_info* info) {
2353 return false;
2354 }
2355
2356 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2357 return end;
2358 }
2359
2360 // Reserves and attaches a shared memory segment.
2361 // Will assert if a wish address is given and could not be obtained.
2362 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2363
2364 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2365 // thereby clobbering old mappings at that place. That is probably
2366 // not intended, never used and almost certainly an error were it
2367 // ever be used this way (to try attaching at a specified address
2368 // without clobbering old mappings an alternate API exists,
2369 // os::attempt_reserve_memory_at()).
2370 // Instead of mimicking the dangerous coding of the other platforms, here I
2371 // just ignore the request address (release) or assert(debug).
2372 assert0(requested_addr == NULL);
2373
2374 // Always round to os::vm_page_size(), which may be larger than 4K.
2375 bytes = align_up(bytes, os::vm_page_size());
2376 const size_t alignment_hint0 =
2377 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2378
2379 // In 4K mode always use mmap.
2380 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2381 if (os::vm_page_size() == 4*K) {
2382 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2383 } else {
2384 if (bytes >= Use64KPagesThreshold) {
2385 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2386 } else {
2387 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2388 }
2389 }
2390 }
2391
2392 bool os::pd_release_memory(char* addr, size_t size) {
2393
2394 // Dynamically do different things for mmap/shmat.
2395 vmembk_t* const vmi = vmembk_find(addr);
2396 guarantee0(vmi);
2397
2398 // Always round to os::vm_page_size(), which may be larger than 4K.
2399 size = align_up(size, os::vm_page_size());
2400 addr = align_up(addr, os::vm_page_size());
2401
2402 bool rc = false;
2403 bool remove_bookkeeping = false;
2404 if (vmi->type == VMEM_SHMATED) {
2405 // For shmatted memory, we do:
2406 // - If user wants to release the whole range, release the memory (shmdt).
2407 // - If user only wants to release a partial range, uncommit (disclaim) that
2408 // range. That way, at least, we do not use memory anymore (bust still page
2409 // table space).
2410 vmi->assert_is_valid_subrange(addr, size);
2411 if (addr == vmi->addr && size == vmi->size) {
2412 rc = release_shmated_memory(addr, size);
2413 remove_bookkeeping = true;
2414 } else {
2415 rc = uncommit_shmated_memory(addr, size);
2416 }
2417 } else {
2418 // User may unmap partial regions but region has to be fully contained.
2419 #ifdef ASSERT
2420 vmi->assert_is_valid_subrange(addr, size);
2421 #endif
2422 rc = release_mmaped_memory(addr, size);
2423 remove_bookkeeping = true;
2424 }
2425
2426 // update bookkeeping
2427 if (rc && remove_bookkeeping) {
2428 vmembk_remove(vmi);
2429 }
2430
2431 return rc;
2432 }
2433
2434 static bool checked_mprotect(char* addr, size_t size, int prot) {
2435
2436 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2437 // not tell me if protection failed when trying to protect an un-protectable range.
2438 //
2439 // This means if the memory was allocated using shmget/shmat, protection wont work
2440 // but mprotect will still return 0:
2441 //
2442 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2443
2444 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2445
2446 if (!rc) {
2447 const char* const s_errno = os::errno_name(errno);
2448 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2449 return false;
2450 }
2451
2452 // mprotect success check
2453 //
2454 // Mprotect said it changed the protection but can I believe it?
2455 //
2456 // To be sure I need to check the protection afterwards. Try to
2457 // read from protected memory and check whether that causes a segfault.
2458 //
2459 if (!os::Aix::xpg_sus_mode()) {
2460
2461 if (CanUseSafeFetch32()) {
2462
2463 const bool read_protected =
2464 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2465 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2466
2467 if (prot & PROT_READ) {
2468 rc = !read_protected;
2469 } else {
2470 rc = read_protected;
2471 }
2472
2473 if (!rc) {
2474 if (os::Aix::on_pase()) {
2475 // There is an issue on older PASE systems where mprotect() will return success but the
2476 // memory will not be protected.
2477 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2478 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2479 // a stack. It is an OS error.
2480 //
2481 // A valid strategy is just to try again. This usually works. :-/
2482
2483 ::usleep(1000);
2484 if (::mprotect(addr, size, prot) == 0) {
2485 const bool read_protected_2 =
2486 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2487 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2488 rc = true;
2489 }
2490 }
2491 }
2492 }
2493 }
2494
2495 assert(rc == true, "mprotect failed.");
2496
2497 return rc;
2498 }
2499
2500 // Set protections specified
2501 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2502 unsigned int p = 0;
2503 switch (prot) {
2504 case MEM_PROT_NONE: p = PROT_NONE; break;
2505 case MEM_PROT_READ: p = PROT_READ; break;
2506 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2507 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2508 default:
2509 ShouldNotReachHere();
2510 }
2511 // is_committed is unused.
2512 return checked_mprotect(addr, size, p);
2513 }
2514
2515 bool os::guard_memory(char* addr, size_t size) {
2516 return checked_mprotect(addr, size, PROT_NONE);
2517 }
2518
2519 bool os::unguard_memory(char* addr, size_t size) {
2520 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2521 }
2522
2523 // Large page support
2524
2525 static size_t _large_page_size = 0;
2526
2527 // Enable large page support if OS allows that.
2528 void os::large_page_init() {
2529 return; // Nothing to do. See query_multipage_support and friends.
2530 }
2531
2532 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2533 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2534 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2535 // so this is not needed.
2536 assert(false, "should not be called on AIX");
2537 return NULL;
2538 }
2539
2540 bool os::release_memory_special(char* base, size_t bytes) {
2541 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2542 Unimplemented();
2543 return false;
2544 }
2545
2546 size_t os::large_page_size() {
2547 return _large_page_size;
2548 }
2549
2550 bool os::can_commit_large_page_memory() {
2551 // Does not matter, we do not support huge pages.
2552 return false;
2553 }
2554
2555 bool os::can_execute_large_page_memory() {
2556 // Does not matter, we do not support huge pages.
2557 return false;
2558 }
2559
2560 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2561 assert(file_desc >= 0, "file_desc is not valid");
2562 char* result = NULL;
2563
2564 // Always round to os::vm_page_size(), which may be larger than 4K.
2565 bytes = align_up(bytes, os::vm_page_size());
2566 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2567
2568 if (result != NULL) {
2569 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2570 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2571 }
2572 }
2573 return result;
2574 }
2575
2576 // Reserve memory at an arbitrary address, only if that area is
2577 // available (and not reserved for something else).
2578 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2579 char* addr = NULL;
2580
2581 // Always round to os::vm_page_size(), which may be larger than 4K.
2582 bytes = align_up(bytes, os::vm_page_size());
2583
2584 // In 4K mode always use mmap.
2585 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2586 if (os::vm_page_size() == 4*K) {
2587 return reserve_mmaped_memory(bytes, requested_addr, 0);
2588 } else {
2589 if (bytes >= Use64KPagesThreshold) {
2590 return reserve_shmated_memory(bytes, requested_addr, 0);
2591 } else {
2592 return reserve_mmaped_memory(bytes, requested_addr, 0);
2593 }
2594 }
2595
2596 return addr;
2597 }
2598
2599 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2600 return ::read(fd, buf, nBytes);
2601 }
2602
2603 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2604 return ::pread(fd, buf, nBytes, offset);
2605 }
2606
2607 void os::naked_short_sleep(jlong ms) {
2608 struct timespec req;
2609
2610 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2611 req.tv_sec = 0;
2612 if (ms > 0) {
2613 req.tv_nsec = (ms % 1000) * 1000000;
2614 }
2615 else {
2616 req.tv_nsec = 1;
2617 }
2618
2619 nanosleep(&req, NULL);
2620
2621 return;
2622 }
2623
2624 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2625 void os::infinite_sleep() {
2626 while (true) { // sleep forever ...
2627 ::sleep(100); // ... 100 seconds at a time
2628 }
2629 }
2630
2631 // Used to convert frequent JVM_Yield() to nops
2632 bool os::dont_yield() {
2633 return DontYieldALot;
2634 }
2635
2636 void os::naked_yield() {
2637 sched_yield();
2638 }
2639
2640 ////////////////////////////////////////////////////////////////////////////////
2641 // thread priority support
2642
2643 // From AIX manpage to pthread_setschedparam
2644 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2645 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2646 //
2647 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2648 // range from 40 to 80, where 40 is the least favored priority and 80
2649 // is the most favored."
2650 //
2651 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2652 // scheduling there; however, this still leaves iSeries.)
2653 //
2654 // We use the same values for AIX and PASE.
2655 int os::java_to_os_priority[CriticalPriority + 1] = {
2656 54, // 0 Entry should never be used
2657
2658 55, // 1 MinPriority
2659 55, // 2
2660 56, // 3
2661
2662 56, // 4
2663 57, // 5 NormPriority
2664 57, // 6
2665
2666 58, // 7
2667 58, // 8
2668 59, // 9 NearMaxPriority
2669
2670 60, // 10 MaxPriority
2671
2672 60 // 11 CriticalPriority
2673 };
2674
2675 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2676 if (!UseThreadPriorities) return OS_OK;
2677 pthread_t thr = thread->osthread()->pthread_id();
2678 int policy = SCHED_OTHER;
2679 struct sched_param param;
2680 param.sched_priority = newpri;
2681 int ret = pthread_setschedparam(thr, policy, ¶m);
2682
2683 if (ret != 0) {
2684 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2685 (int)thr, newpri, ret, os::errno_name(ret));
2686 }
2687 return (ret == 0) ? OS_OK : OS_ERR;
2688 }
2689
2690 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2691 if (!UseThreadPriorities) {
2692 *priority_ptr = java_to_os_priority[NormPriority];
2693 return OS_OK;
2694 }
2695 pthread_t thr = thread->osthread()->pthread_id();
2696 int policy = SCHED_OTHER;
2697 struct sched_param param;
2698 int ret = pthread_getschedparam(thr, &policy, ¶m);
2699 *priority_ptr = param.sched_priority;
2700
2701 return (ret == 0) ? OS_OK : OS_ERR;
2702 }
2703
2704 // Hint to the underlying OS that a task switch would not be good.
2705 // Void return because it's a hint and can fail.
2706 void os::hint_no_preempt() {}
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 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
3572 // Check and sets minimum stack sizes against command line options
3573 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3574 return JNI_ERR;
3575 }
3576
3577 if (UseNUMA) {
3578 UseNUMA = false;
3579 warning("NUMA optimizations are not available on this OS.");
3580 }
3581
3582 if (MaxFDLimit) {
3583 // Set the number of file descriptors to max. print out error
3584 // if getrlimit/setrlimit fails but continue regardless.
3585 struct rlimit nbr_files;
3586 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3587 if (status != 0) {
3588 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3589 } else {
3590 nbr_files.rlim_cur = nbr_files.rlim_max;
3591 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3592 if (status != 0) {
3593 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3594 }
3595 }
3596 }
3597
3598 if (PerfAllowAtExitRegistration) {
3599 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3600 // At exit functions can be delayed until process exit time, which
3601 // can be problematic for embedded VM situations. Embedded VMs should
3602 // call DestroyJavaVM() to assure that VM resources are released.
3603
3604 // Note: perfMemory_exit_helper atexit function may be removed in
3605 // the future if the appropriate cleanup code can be added to the
3606 // VM_Exit VMOperation's doit method.
3607 if (atexit(perfMemory_exit_helper) != 0) {
3608 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3609 }
3610 }
3611
3612 return JNI_OK;
3613 }
3614
3615 // Mark the polling page as unreadable
3616 void os::make_polling_page_unreadable(void) {
3617 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3618 fatal("Could not disable polling page");
3619 }
3620 };
3621
3622 // Mark the polling page as readable
3623 void os::make_polling_page_readable(void) {
3624 // Changed according to os_linux.cpp.
3625 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3626 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3627 }
3628 };
3629
3630 int os::active_processor_count() {
3631 // User has overridden the number of active processors
3632 if (ActiveProcessorCount > 0) {
3633 log_trace(os)("active_processor_count: "
3634 "active processor count set by user : %d",
3635 ActiveProcessorCount);
3636 return ActiveProcessorCount;
3637 }
3638
3639 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3640 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3641 return online_cpus;
3642 }
3643
3644 void os::set_native_thread_name(const char *name) {
3645 // Not yet implemented.
3646 return;
3647 }
3648
3649 bool os::distribute_processes(uint length, uint* distribution) {
3650 // Not yet implemented.
3651 return false;
3652 }
3653
3654 bool os::bind_to_processor(uint processor_id) {
3655 // Not yet implemented.
3656 return false;
3657 }
3658
3659 void os::SuspendedThreadTask::internal_do_task() {
3660 if (do_suspend(_thread->osthread())) {
3661 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3662 do_task(context);
3663 do_resume(_thread->osthread());
3664 }
3665 }
3666
3667 ////////////////////////////////////////////////////////////////////////////////
3668 // debug support
3669
3670 bool os::find(address addr, outputStream* st) {
3671
3672 st->print(PTR_FORMAT ": ", addr);
3673
3674 loaded_module_t lm;
3675 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3676 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3677 st->print_cr("%s", lm.path);
3678 return true;
3679 }
3680
3681 return false;
3682 }
3683
3684 ////////////////////////////////////////////////////////////////////////////////
3685 // misc
3686
3687 // This does not do anything on Aix. This is basically a hook for being
3688 // able to use structured exception handling (thread-local exception filters)
3689 // on, e.g., Win32.
3690 void
3691 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3692 JavaCallArguments* args, Thread* thread) {
3693 f(value, method, args, thread);
3694 }
3695
3696 void os::print_statistics() {
3697 }
3698
3699 bool os::message_box(const char* title, const char* message) {
3700 int i;
3701 fdStream err(defaultStream::error_fd());
3702 for (i = 0; i < 78; i++) err.print_raw("=");
3703 err.cr();
3704 err.print_raw_cr(title);
3705 for (i = 0; i < 78; i++) err.print_raw("-");
3706 err.cr();
3707 err.print_raw_cr(message);
3708 for (i = 0; i < 78; i++) err.print_raw("=");
3709 err.cr();
3710
3711 char buf[16];
3712 // Prevent process from exiting upon "read error" without consuming all CPU
3713 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3714
3715 return buf[0] == 'y' || buf[0] == 'Y';
3716 }
3717
3718 int os::stat(const char *path, struct stat *sbuf) {
3719 char pathbuf[MAX_PATH];
3720 if (strlen(path) > MAX_PATH - 1) {
3721 errno = ENAMETOOLONG;
3722 return -1;
3723 }
3724 os::native_path(strcpy(pathbuf, path));
3725 return ::stat(pathbuf, sbuf);
3726 }
3727
3728 // Is a (classpath) directory empty?
3729 bool os::dir_is_empty(const char* path) {
3730 DIR *dir = NULL;
3731 struct dirent *ptr;
3732
3733 dir = opendir(path);
3734 if (dir == NULL) return true;
3735
3736 /* Scan the directory */
3737 bool result = true;
3738 char buf[sizeof(struct dirent) + MAX_PATH];
3739 while (result && (ptr = ::readdir(dir)) != NULL) {
3740 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3741 result = false;
3742 }
3743 }
3744 closedir(dir);
3745 return result;
3746 }
3747
3748 // This code originates from JDK's sysOpen and open64_w
3749 // from src/solaris/hpi/src/system_md.c
3750
3751 int os::open(const char *path, int oflag, int mode) {
3752
3753 if (strlen(path) > MAX_PATH - 1) {
3754 errno = ENAMETOOLONG;
3755 return -1;
3756 }
3757 int fd;
3758
3759 fd = ::open64(path, oflag, mode);
3760 if (fd == -1) return -1;
3761
3762 // If the open succeeded, the file might still be a directory.
3763 {
3764 struct stat64 buf64;
3765 int ret = ::fstat64(fd, &buf64);
3766 int st_mode = buf64.st_mode;
3767
3768 if (ret != -1) {
3769 if ((st_mode & S_IFMT) == S_IFDIR) {
3770 errno = EISDIR;
3771 ::close(fd);
3772 return -1;
3773 }
3774 } else {
3775 ::close(fd);
3776 return -1;
3777 }
3778 }
3779
3780 // All file descriptors that are opened in the JVM and not
3781 // specifically destined for a subprocess should have the
3782 // close-on-exec flag set. If we don't set it, then careless 3rd
3783 // party native code might fork and exec without closing all
3784 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3785 // UNIXProcess.c), and this in turn might:
3786 //
3787 // - cause end-of-file to fail to be detected on some file
3788 // descriptors, resulting in mysterious hangs, or
3789 //
3790 // - might cause an fopen in the subprocess to fail on a system
3791 // suffering from bug 1085341.
3792 //
3793 // (Yes, the default setting of the close-on-exec flag is a Unix
3794 // design flaw.)
3795 //
3796 // See:
3797 // 1085341: 32-bit stdio routines should support file descriptors >255
3798 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3799 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3800 #ifdef FD_CLOEXEC
3801 {
3802 int flags = ::fcntl(fd, F_GETFD);
3803 if (flags != -1)
3804 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3805 }
3806 #endif
3807
3808 return fd;
3809 }
3810
3811 // create binary file, rewriting existing file if required
3812 int os::create_binary_file(const char* path, bool rewrite_existing) {
3813 int oflags = O_WRONLY | O_CREAT;
3814 if (!rewrite_existing) {
3815 oflags |= O_EXCL;
3816 }
3817 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3818 }
3819
3820 // return current position of file pointer
3821 jlong os::current_file_offset(int fd) {
3822 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3823 }
3824
3825 // move file pointer to the specified offset
3826 jlong os::seek_to_file_offset(int fd, jlong offset) {
3827 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3828 }
3829
3830 // This code originates from JDK's sysAvailable
3831 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3832
3833 int os::available(int fd, jlong *bytes) {
3834 jlong cur, end;
3835 int mode;
3836 struct stat64 buf64;
3837
3838 if (::fstat64(fd, &buf64) >= 0) {
3839 mode = buf64.st_mode;
3840 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3841 int n;
3842 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3843 *bytes = n;
3844 return 1;
3845 }
3846 }
3847 }
3848 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3849 return 0;
3850 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3851 return 0;
3852 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3853 return 0;
3854 }
3855 *bytes = end - cur;
3856 return 1;
3857 }
3858
3859 // Map a block of memory.
3860 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3861 char *addr, size_t bytes, bool read_only,
3862 bool allow_exec) {
3863 int prot;
3864 int flags = MAP_PRIVATE;
3865
3866 if (read_only) {
3867 prot = PROT_READ;
3868 flags = MAP_SHARED;
3869 } else {
3870 prot = PROT_READ | PROT_WRITE;
3871 flags = MAP_PRIVATE;
3872 }
3873
3874 if (allow_exec) {
3875 prot |= PROT_EXEC;
3876 }
3877
3878 if (addr != NULL) {
3879 flags |= MAP_FIXED;
3880 }
3881
3882 // Allow anonymous mappings if 'fd' is -1.
3883 if (fd == -1) {
3884 flags |= MAP_ANONYMOUS;
3885 }
3886
3887 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3888 fd, file_offset);
3889 if (mapped_address == MAP_FAILED) {
3890 return NULL;
3891 }
3892 return mapped_address;
3893 }
3894
3895 // Remap a block of memory.
3896 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3897 char *addr, size_t bytes, bool read_only,
3898 bool allow_exec) {
3899 // same as map_memory() on this OS
3900 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3901 allow_exec);
3902 }
3903
3904 // Unmap a block of memory.
3905 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3906 return munmap(addr, bytes) == 0;
3907 }
3908
3909 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3910 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3911 // of a thread.
3912 //
3913 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3914 // the fast estimate available on the platform.
3915
3916 jlong os::current_thread_cpu_time() {
3917 // return user + sys since the cost is the same
3918 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3919 assert(n >= 0, "negative CPU time");
3920 return n;
3921 }
3922
3923 jlong os::thread_cpu_time(Thread* thread) {
3924 // consistent with what current_thread_cpu_time() returns
3925 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3926 assert(n >= 0, "negative CPU time");
3927 return n;
3928 }
3929
3930 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3931 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3932 assert(n >= 0, "negative CPU time");
3933 return n;
3934 }
3935
3936 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3937 bool error = false;
3938
3939 jlong sys_time = 0;
3940 jlong user_time = 0;
3941
3942 // Reimplemented using getthrds64().
3943 //
3944 // Works like this:
3945 // For the thread in question, get the kernel thread id. Then get the
3946 // kernel thread statistics using that id.
3947 //
3948 // This only works of course when no pthread scheduling is used,
3949 // i.e. there is a 1:1 relationship to kernel threads.
3950 // On AIX, see AIXTHREAD_SCOPE variable.
3951
3952 pthread_t pthtid = thread->osthread()->pthread_id();
3953
3954 // retrieve kernel thread id for the pthread:
3955 tid64_t tid = 0;
3956 struct __pthrdsinfo pinfo;
3957 // I just love those otherworldly IBM APIs which force me to hand down
3958 // dummy buffers for stuff I dont care for...
3959 char dummy[1];
3960 int dummy_size = sizeof(dummy);
3961 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3962 dummy, &dummy_size) == 0) {
3963 tid = pinfo.__pi_tid;
3964 } else {
3965 tty->print_cr("pthread_getthrds_np failed.");
3966 error = true;
3967 }
3968
3969 // retrieve kernel timing info for that kernel thread
3970 if (!error) {
3971 struct thrdentry64 thrdentry;
3972 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3973 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3974 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3975 } else {
3976 tty->print_cr("pthread_getthrds_np failed.");
3977 error = true;
3978 }
3979 }
3980
3981 if (p_sys_time) {
3982 *p_sys_time = sys_time;
3983 }
3984
3985 if (p_user_time) {
3986 *p_user_time = user_time;
3987 }
3988
3989 if (error) {
3990 return false;
3991 }
3992
3993 return true;
3994 }
3995
3996 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3997 jlong sys_time;
3998 jlong user_time;
3999
4000 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4001 return -1;
4002 }
4003
4004 return user_sys_cpu_time ? sys_time + user_time : user_time;
4005 }
4006
4007 void os::current_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 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4015 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4016 info_ptr->may_skip_backward = false; // elapsed time not wall time
4017 info_ptr->may_skip_forward = false; // elapsed time not wall time
4018 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4019 }
4020
4021 bool os::is_thread_cpu_time_supported() {
4022 return true;
4023 }
4024
4025 // System loadavg support. Returns -1 if load average cannot be obtained.
4026 // For now just return the system wide load average (no processor sets).
4027 int os::loadavg(double values[], int nelem) {
4028
4029 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4030 guarantee(values, "argument error");
4031
4032 if (os::Aix::on_pase()) {
4033
4034 // AS/400 PASE: use libo4 porting library
4035 double v[3] = { 0.0, 0.0, 0.0 };
4036
4037 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4038 for (int i = 0; i < nelem; i ++) {
4039 values[i] = v[i];
4040 }
4041 return nelem;
4042 } else {
4043 return -1;
4044 }
4045
4046 } else {
4047
4048 // AIX: use libperfstat
4049 libperfstat::cpuinfo_t ci;
4050 if (libperfstat::get_cpuinfo(&ci)) {
4051 for (int i = 0; i < nelem; i++) {
4052 values[i] = ci.loadavg[i];
4053 }
4054 } else {
4055 return -1;
4056 }
4057 return nelem;
4058 }
4059 }
4060
4061 void os::pause() {
4062 char filename[MAX_PATH];
4063 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4064 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4065 } else {
4066 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4067 }
4068
4069 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4070 if (fd != -1) {
4071 struct stat buf;
4072 ::close(fd);
4073 while (::stat(filename, &buf) == 0) {
4074 (void)::poll(NULL, 0, 100);
4075 }
4076 } else {
4077 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4078 }
4079 }
4080
4081 bool os::is_primordial_thread(void) {
4082 if (pthread_self() == (pthread_t)1) {
4083 return true;
4084 } else {
4085 return false;
4086 }
4087 }
4088
4089 // OS recognitions (PASE/AIX, OS level) call this before calling any
4090 // one of Aix::on_pase(), Aix::os_version() static
4091 void os::Aix::initialize_os_info() {
4092
4093 assert(_on_pase == -1 && _os_version == 0, "already called.");
4094
4095 struct utsname uts;
4096 memset(&uts, 0, sizeof(uts));
4097 strcpy(uts.sysname, "?");
4098 if (::uname(&uts) == -1) {
4099 trcVerbose("uname failed (%d)", errno);
4100 guarantee(0, "Could not determine whether we run on AIX or PASE");
4101 } else {
4102 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4103 "node \"%s\" machine \"%s\"\n",
4104 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4105 const int major = atoi(uts.version);
4106 assert(major > 0, "invalid OS version");
4107 const int minor = atoi(uts.release);
4108 assert(minor > 0, "invalid OS release");
4109 _os_version = (major << 24) | (minor << 16);
4110 char ver_str[20] = {0};
4111 char *name_str = "unknown OS";
4112 if (strcmp(uts.sysname, "OS400") == 0) {
4113 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4114 _on_pase = 1;
4115 if (os_version_short() < 0x0504) {
4116 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4117 assert(false, "OS/400 release too old.");
4118 }
4119 name_str = "OS/400 (pase)";
4120 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4121 } else if (strcmp(uts.sysname, "AIX") == 0) {
4122 // We run on AIX. We do not support versions older than AIX 5.3.
4123 _on_pase = 0;
4124 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4125 odmWrapper::determine_os_kernel_version(&_os_version);
4126 if (os_version_short() < 0x0503) {
4127 trcVerbose("AIX release older than AIX 5.3 not supported.");
4128 assert(false, "AIX release too old.");
4129 }
4130 name_str = "AIX";
4131 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4132 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4133 } else {
4134 assert(false, name_str);
4135 }
4136 trcVerbose("We run on %s %s", name_str, ver_str);
4137 }
4138
4139 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4140 } // end: os::Aix::initialize_os_info()
4141
4142 // Scan environment for important settings which might effect the VM.
4143 // Trace out settings. Warn about invalid settings and/or correct them.
4144 //
4145 // Must run after os::Aix::initialue_os_info().
4146 void os::Aix::scan_environment() {
4147
4148 char* p;
4149 int rc;
4150
4151 // Warn explicity if EXTSHM=ON is used. That switch changes how
4152 // System V shared memory behaves. One effect is that page size of
4153 // shared memory cannot be change dynamically, effectivly preventing
4154 // large pages from working.
4155 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4156 // recommendation is (in OSS notes) to switch it off.
4157 p = ::getenv("EXTSHM");
4158 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4159 if (p && strcasecmp(p, "ON") == 0) {
4160 _extshm = 1;
4161 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4162 if (!AllowExtshm) {
4163 // We allow under certain conditions the user to continue. However, we want this
4164 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4165 // that the VM is not able to allocate 64k pages for the heap.
4166 // We do not want to run with reduced performance.
4167 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4168 }
4169 } else {
4170 _extshm = 0;
4171 }
4172
4173 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4174 // Not tested, not supported.
4175 //
4176 // Note that it might be worth the trouble to test and to require it, if only to
4177 // get useful return codes for mprotect.
4178 //
4179 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4180 // exec() ? before loading the libjvm ? ....)
4181 p = ::getenv("XPG_SUS_ENV");
4182 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4183 if (p && strcmp(p, "ON") == 0) {
4184 _xpg_sus_mode = 1;
4185 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4186 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4187 // clobber address ranges. If we ever want to support that, we have to do some
4188 // testing first.
4189 guarantee(false, "XPG_SUS_ENV=ON not supported");
4190 } else {
4191 _xpg_sus_mode = 0;
4192 }
4193
4194 if (os::Aix::on_pase()) {
4195 p = ::getenv("QIBM_MULTI_THREADED");
4196 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4197 }
4198
4199 p = ::getenv("LDR_CNTRL");
4200 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4201 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4202 if (p && ::strstr(p, "TEXTPSIZE")) {
4203 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4204 "you may experience hangs or crashes on OS/400 V7R1.");
4205 }
4206 }
4207
4208 p = ::getenv("AIXTHREAD_GUARDPAGES");
4209 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4210
4211 } // end: os::Aix::scan_environment()
4212
4213 // PASE: initialize the libo4 library (PASE porting library).
4214 void os::Aix::initialize_libo4() {
4215 guarantee(os::Aix::on_pase(), "OS/400 only.");
4216 if (!libo4::init()) {
4217 trcVerbose("libo4 initialization failed.");
4218 assert(false, "libo4 initialization failed");
4219 } else {
4220 trcVerbose("libo4 initialized.");
4221 }
4222 }
4223
4224 // AIX: initialize the libperfstat library.
4225 void os::Aix::initialize_libperfstat() {
4226 assert(os::Aix::on_aix(), "AIX only");
4227 if (!libperfstat::init()) {
4228 trcVerbose("libperfstat initialization failed.");
4229 assert(false, "libperfstat initialization failed");
4230 } else {
4231 trcVerbose("libperfstat initialized.");
4232 }
4233 }
4234
4235 /////////////////////////////////////////////////////////////////////////////
4236 // thread stack
4237
4238 // Get the current stack base from the OS (actually, the pthread library).
4239 // Note: usually not page aligned.
4240 address os::current_stack_base() {
4241 AixMisc::stackbounds_t bounds;
4242 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4243 guarantee(rc, "Unable to retrieve stack bounds.");
4244 return bounds.base;
4245 }
4246
4247 // Get the current stack size from the OS (actually, the pthread library).
4248 // Returned size is such that (base - size) is always aligned to page size.
4249 size_t os::current_stack_size() {
4250 AixMisc::stackbounds_t bounds;
4251 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4252 guarantee(rc, "Unable to retrieve stack bounds.");
4253 // Align the returned stack size such that the stack low address
4254 // is aligned to page size (Note: base is usually not and we do not care).
4255 // We need to do this because caller code will assume stack low address is
4256 // page aligned and will place guard pages without checking.
4257 address low = bounds.base - bounds.size;
4258 address low_aligned = (address)align_up(low, os::vm_page_size());
4259 size_t s = bounds.base - low_aligned;
4260 return s;
4261 }
4262
4263 extern char** environ;
4264
4265 // Run the specified command in a separate process. Return its exit value,
4266 // or -1 on failure (e.g. can't fork a new process).
4267 // Unlike system(), this function can be called from signal handler. It
4268 // doesn't block SIGINT et al.
4269 int os::fork_and_exec(char* cmd) {
4270 char * argv[4] = {"sh", "-c", cmd, NULL};
4271
4272 pid_t pid = fork();
4273
4274 if (pid < 0) {
4275 // fork failed
4276 return -1;
4277
4278 } else if (pid == 0) {
4279 // child process
4280
4281 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4282 execve("/usr/bin/sh", argv, environ);
4283
4284 // execve failed
4285 _exit(-1);
4286
4287 } else {
4288 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4289 // care about the actual exit code, for now.
4290
4291 int status;
4292
4293 // Wait for the child process to exit. This returns immediately if
4294 // the child has already exited. */
4295 while (waitpid(pid, &status, 0) < 0) {
4296 switch (errno) {
4297 case ECHILD: return 0;
4298 case EINTR: break;
4299 default: return -1;
4300 }
4301 }
4302
4303 if (WIFEXITED(status)) {
4304 // The child exited normally; get its exit code.
4305 return WEXITSTATUS(status);
4306 } else if (WIFSIGNALED(status)) {
4307 // The child exited because of a signal.
4308 // The best value to return is 0x80 + signal number,
4309 // because that is what all Unix shells do, and because
4310 // it allows callers to distinguish between process exit and
4311 // process death by signal.
4312 return 0x80 + WTERMSIG(status);
4313 } else {
4314 // Unknown exit code; pass it through.
4315 return status;
4316 }
4317 }
4318 return -1;
4319 }
4320
4321 // Get the default path to the core file
4322 // Returns the length of the string
4323 int os::get_core_path(char* buffer, size_t bufferSize) {
4324 const char* p = get_current_directory(buffer, bufferSize);
4325
4326 if (p == NULL) {
4327 assert(p != NULL, "failed to get current directory");
4328 return 0;
4329 }
4330
4331 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4332 p, current_process_id());
4333
4334 return strlen(buffer);
4335 }
4336
4337 #ifndef PRODUCT
4338 void TestReserveMemorySpecial_test() {
4339 // No tests available for this platform
4340 }
4341 #endif
4342
4343 bool os::start_debugging(char *buf, int buflen) {
4344 int len = (int)strlen(buf);
4345 char *p = &buf[len];
4346
4347 jio_snprintf(p, buflen -len,
4348 "\n\n"
4349 "Do you want to debug the problem?\n\n"
4350 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4351 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4352 "Otherwise, press RETURN to abort...",
4353 os::current_process_id(),
4354 os::current_thread_id(), thread_self());
4355
4356 bool yes = os::message_box("Unexpected Error", buf);
4357
4358 if (yes) {
4359 // yes, user asked VM to launch debugger
4360 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4361
4362 os::fork_and_exec(buf);
4363 yes = false;
4364 }
4365 return yes;
4366 }
4367
4368 static inline time_t get_mtime(const char* filename) {
4369 struct stat st;
4370 int ret = os::stat(filename, &st);
4371 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4372 return st.st_mtime;
4373 }
4374
4375 int os::compare_file_modified_times(const char* file1, const char* file2) {
4376 time_t t1 = get_mtime(file1);
4377 time_t t2 = get_mtime(file2);
4378 return t1 - t2;
4379 }