1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2019 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "libo4.hpp"
42 #include "libperfstat_aix.hpp"
43 #include "libodm_aix.hpp"
44 #include "loadlib_aix.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/filemap.hpp"
47 #include "misc_aix.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "os_aix.inline.hpp"
50 #include "os_share_aix.hpp"
51 #include "porting_aix.hpp"
52 #include "prims/jniFastGetField.hpp"
53 #include "prims/jvm_misc.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/extendedPC.hpp"
57 #include "runtime/globals.hpp"
58 #include "runtime/interfaceSupport.inline.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/mutexLocker.hpp"
62 #include "runtime/objectMonitor.hpp"
63 #include "runtime/orderAccess.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/osThread.hpp"
66 #include "runtime/perfMemory.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/statSampler.hpp"
69 #include "runtime/stubRoutines.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadCritical.hpp"
72 #include "runtime/timer.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "services/attachListener.hpp"
75 #include "services/runtimeService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/decoder.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/vmError.hpp"
82
83 // put OS-includes here (sorted alphabetically)
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <inttypes.h>
87 #include <poll.h>
88 #include <procinfo.h>
89 #include <pthread.h>
90 #include <pwd.h>
91 #include <semaphore.h>
92 #include <signal.h>
93 #include <stdint.h>
94 #include <stdio.h>
95 #include <string.h>
96 #include <unistd.h>
97 #include <sys/ioctl.h>
98 #include <sys/ipc.h>
99 #include <sys/mman.h>
100 #include <sys/resource.h>
101 #include <sys/select.h>
102 #include <sys/shm.h>
103 #include <sys/socket.h>
104 #include <sys/stat.h>
105 #include <sys/sysinfo.h>
106 #include <sys/systemcfg.h>
107 #include <sys/time.h>
108 #include <sys/times.h>
109 #include <sys/types.h>
110 #include <sys/utsname.h>
111 #include <sys/vminfo.h>
112 #include <sys/wait.h>
113
114 // Missing prototypes for various system APIs.
115 extern "C"
116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
117
118 #if !defined(_AIXVERSION_610)
119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
121 extern "C" int getargs(procsinfo*, int, char*, int);
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128 // for multipage initialization error analysis (in 'g_multipage_error')
129 #define ERROR_MP_OS_TOO_OLD 100
130 #define ERROR_MP_EXTSHM_ACTIVE 101
131 #define ERROR_MP_VMGETINFO_FAILED 102
132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
133
134 // excerpts from systemcfg.h that might be missing on older os levels
135 #ifndef PV_7
136 #define PV_7 0x200000 /* Power PC 7 */
137 #endif
138 #ifndef PV_7_Compat
139 #define PV_7_Compat 0x208000 /* Power PC 7 */
140 #endif
141 #ifndef PV_8
142 #define PV_8 0x300000 /* Power PC 8 */
143 #endif
144 #ifndef PV_8_Compat
145 #define PV_8_Compat 0x308000 /* Power PC 8 */
146 #endif
147 #ifndef PV_9
148 #define PV_9 0x400000 /* Power PC 9 */
149 #endif
150 #ifndef PV_9_Compat
151 #define PV_9_Compat 0x408000 /* Power PC 9 */
152 #endif
153
154
155 static address resolve_function_descriptor_to_code_pointer(address p);
156
157 static void vmembk_print_on(outputStream* os);
158
159 ////////////////////////////////////////////////////////////////////////////////
160 // global variables (for a description see os_aix.hpp)
161
162 julong os::Aix::_physical_memory = 0;
163
164 pthread_t os::Aix::_main_thread = ((pthread_t)0);
165 int os::Aix::_page_size = -1;
166
167 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
168 int os::Aix::_on_pase = -1;
169
170 // 0 = uninitialized, otherwise 32 bit number:
171 // 0xVVRRTTSS
172 // VV - major version
173 // RR - minor version
174 // TT - tech level, if known, 0 otherwise
175 // SS - service pack, if known, 0 otherwise
176 uint32_t os::Aix::_os_version = 0;
177
178 // -1 = uninitialized, 0 - no, 1 - yes
179 int os::Aix::_xpg_sus_mode = -1;
180
181 // -1 = uninitialized, 0 - no, 1 - yes
182 int os::Aix::_extshm = -1;
183
184 ////////////////////////////////////////////////////////////////////////////////
185 // local variables
186
187 static volatile jlong max_real_time = 0;
188 static jlong initial_time_count = 0;
189 static int clock_tics_per_sec = 100;
190 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
191 static bool check_signals = true;
192 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
193 static sigset_t SR_sigset;
194
195 // Process break recorded at startup.
196 static address g_brk_at_startup = NULL;
197
198 // This describes the state of multipage support of the underlying
199 // OS. Note that this is of no interest to the outsize world and
200 // therefore should not be defined in AIX class.
201 //
202 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
203 // latter two (16M "large" resp. 16G "huge" pages) require special
204 // setup and are normally not available.
205 //
206 // AIX supports multiple page sizes per process, for:
207 // - Stack (of the primordial thread, so not relevant for us)
208 // - Data - data, bss, heap, for us also pthread stacks
209 // - Text - text code
210 // - shared memory
211 //
212 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
213 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
214 //
215 // For shared memory, page size can be set dynamically via
216 // shmctl(). Different shared memory regions can have different page
217 // sizes.
218 //
219 // More information can be found at AIBM info center:
220 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
221 //
222 static struct {
223 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
224 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
225 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
226 size_t pthr_stack_pagesize; // stack page size of pthread threads
227 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
228 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
229 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
230 int error; // Error describing if something went wrong at multipage init.
231 } g_multipage_support = {
232 (size_t) -1,
233 (size_t) -1,
234 (size_t) -1,
235 (size_t) -1,
236 (size_t) -1,
237 false, false,
238 0
239 };
240
241 // We must not accidentally allocate memory close to the BRK - even if
242 // that would work - because then we prevent the BRK segment from
243 // growing which may result in a malloc OOM even though there is
244 // enough memory. The problem only arises if we shmat() or mmap() at
245 // a specific wish address, e.g. to place the heap in a
246 // compressed-oops-friendly way.
247 static bool is_close_to_brk(address a) {
248 assert0(g_brk_at_startup != NULL);
249 if (a >= g_brk_at_startup &&
250 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
251 return true;
252 }
253 return false;
254 }
255
256 julong os::available_memory() {
257 return Aix::available_memory();
258 }
259
260 julong os::Aix::available_memory() {
261 // Avoid expensive API call here, as returned value will always be null.
262 if (os::Aix::on_pase()) {
263 return 0x0LL;
264 }
265 os::Aix::meminfo_t mi;
266 if (os::Aix::get_meminfo(&mi)) {
267 return mi.real_free;
268 } else {
269 return ULONG_MAX;
270 }
271 }
272
273 julong os::physical_memory() {
274 return Aix::physical_memory();
275 }
276
277 // Return true if user is running as root.
278
279 bool os::have_special_privileges() {
280 static bool init = false;
281 static bool privileges = false;
282 if (!init) {
283 privileges = (getuid() != geteuid()) || (getgid() != getegid());
284 init = true;
285 }
286 return privileges;
287 }
288
289 // Helper function, emulates disclaim64 using multiple 32bit disclaims
290 // because we cannot use disclaim64() on AS/400 and old AIX releases.
291 static bool my_disclaim64(char* addr, size_t size) {
292
293 if (size == 0) {
294 return true;
295 }
296
297 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
298 const unsigned int maxDisclaimSize = 0x40000000;
299
300 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
301 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
302
303 char* p = addr;
304
305 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
306 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
307 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
308 return false;
309 }
310 p += maxDisclaimSize;
311 }
312
313 if (lastDisclaimSize > 0) {
314 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
315 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
316 return false;
317 }
318 }
319
320 return true;
321 }
322
323 // Cpu architecture string
324 #if defined(PPC32)
325 static char cpu_arch[] = "ppc";
326 #elif defined(PPC64)
327 static char cpu_arch[] = "ppc64";
328 #else
329 #error Add appropriate cpu_arch setting
330 #endif
331
332 // Wrap the function "vmgetinfo" which is not available on older OS releases.
333 static int checked_vmgetinfo(void *out, int command, int arg) {
334 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
335 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
336 }
337 return ::vmgetinfo(out, command, arg);
338 }
339
340 // Given an address, returns the size of the page backing that address.
341 size_t os::Aix::query_pagesize(void* addr) {
342
343 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
344 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
345 return 4*K;
346 }
347
348 vm_page_info pi;
349 pi.addr = (uint64_t)addr;
350 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
351 return pi.pagesize;
352 } else {
353 assert(false, "vmgetinfo failed to retrieve page size");
354 return 4*K;
355 }
356 }
357
358 void os::Aix::initialize_system_info() {
359
360 // Get the number of online(logical) cpus instead of configured.
361 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
362 assert(_processor_count > 0, "_processor_count must be > 0");
363
364 // Retrieve total physical storage.
365 os::Aix::meminfo_t mi;
366 if (!os::Aix::get_meminfo(&mi)) {
367 assert(false, "os::Aix::get_meminfo failed.");
368 }
369 _physical_memory = (julong) mi.real_total;
370 }
371
372 // Helper function for tracing page sizes.
373 static const char* describe_pagesize(size_t pagesize) {
374 switch (pagesize) {
375 case 4*K : return "4K";
376 case 64*K: return "64K";
377 case 16*M: return "16M";
378 case 16*G: return "16G";
379 default:
380 assert(false, "surprise");
381 return "??";
382 }
383 }
384
385 // Probe OS for multipage support.
386 // Will fill the global g_multipage_support structure.
387 // Must be called before calling os::large_page_init().
388 static void query_multipage_support() {
389
390 guarantee(g_multipage_support.pagesize == -1,
391 "do not call twice");
392
393 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
394
395 // This really would surprise me.
396 assert(g_multipage_support.pagesize == 4*K, "surprise!");
397
398 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
399 // Default data page size is defined either by linker options (-bdatapsize)
400 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
401 // default should be 4K.
402 {
403 void* p = ::malloc(16*M);
404 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
405 ::free(p);
406 }
407
408 // Query default shm page size (LDR_CNTRL SHMPSIZE).
409 // Note that this is pure curiosity. We do not rely on default page size but set
410 // our own page size after allocated.
411 {
412 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
413 guarantee(shmid != -1, "shmget failed");
414 void* p = ::shmat(shmid, NULL, 0);
415 ::shmctl(shmid, IPC_RMID, NULL);
416 guarantee(p != (void*) -1, "shmat failed");
417 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
418 ::shmdt(p);
419 }
420
421 // Before querying the stack page size, make sure we are not running as primordial
422 // thread (because primordial thread's stack may have different page size than
423 // pthread thread stacks). Running a VM on the primordial thread won't work for a
424 // number of reasons so we may just as well guarantee it here.
425 guarantee0(!os::is_primordial_thread());
426
427 // Query pthread stack page size. Should be the same as data page size because
428 // pthread stacks are allocated from C-Heap.
429 {
430 int dummy = 0;
431 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
432 }
433
434 // Query default text page size (LDR_CNTRL TEXTPSIZE).
435 {
436 address any_function =
437 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
438 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
439 }
440
441 // Now probe for support of 64K pages and 16M pages.
442
443 // Before OS/400 V6R1, there is no support for pages other than 4K.
444 if (os::Aix::on_pase_V5R4_or_older()) {
445 trcVerbose("OS/400 < V6R1 - no large page support.");
446 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
447 goto query_multipage_support_end;
448 }
449
450 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
451 {
452 const int MAX_PAGE_SIZES = 4;
453 psize_t sizes[MAX_PAGE_SIZES];
454 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
455 if (num_psizes == -1) {
456 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
457 trcVerbose("disabling multipage support.");
458 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
459 goto query_multipage_support_end;
460 }
461 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
462 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
463 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
464 for (int i = 0; i < num_psizes; i ++) {
465 trcVerbose(" %s ", describe_pagesize(sizes[i]));
466 }
467
468 // Can we use 64K, 16M pages?
469 for (int i = 0; i < num_psizes; i ++) {
470 const size_t pagesize = sizes[i];
471 if (pagesize != 64*K && pagesize != 16*M) {
472 continue;
473 }
474 bool can_use = false;
475 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
476 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
477 IPC_CREAT | S_IRUSR | S_IWUSR);
478 guarantee0(shmid != -1); // Should always work.
479 // Try to set pagesize.
480 struct shmid_ds shm_buf = { 0 };
481 shm_buf.shm_pagesize = pagesize;
482 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
483 const int en = errno;
484 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
485 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%d", errno);
486 } else {
487 // Attach and double check pageisze.
488 void* p = ::shmat(shmid, NULL, 0);
489 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
490 guarantee0(p != (void*) -1); // Should always work.
491 const size_t real_pagesize = os::Aix::query_pagesize(p);
492 if (real_pagesize != pagesize) {
493 trcVerbose("real page size (" SIZE_FORMAT_HEX ") differs.", real_pagesize);
494 } else {
495 can_use = true;
496 }
497 ::shmdt(p);
498 }
499 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
500 if (pagesize == 64*K) {
501 g_multipage_support.can_use_64K_pages = can_use;
502 } else if (pagesize == 16*M) {
503 g_multipage_support.can_use_16M_pages = can_use;
504 }
505 }
506
507 } // end: check which pages can be used for shared memory
508
509 query_multipage_support_end:
510
511 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
512 describe_pagesize(g_multipage_support.pagesize));
513 trcVerbose("Data page size (C-Heap, bss, etc): %s",
514 describe_pagesize(g_multipage_support.datapsize));
515 trcVerbose("Text page size: %s",
516 describe_pagesize(g_multipage_support.textpsize));
517 trcVerbose("Thread stack page size (pthread): %s",
518 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
519 trcVerbose("Default shared memory page size: %s",
520 describe_pagesize(g_multipage_support.shmpsize));
521 trcVerbose("Can use 64K pages dynamically with shared memory: %s",
522 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
523 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
524 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
525 trcVerbose("Multipage error details: %d",
526 g_multipage_support.error);
527
528 // sanity checks
529 assert0(g_multipage_support.pagesize == 4*K);
530 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
531 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
532 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
533 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
534
535 }
536
537 void os::init_system_properties_values() {
538
539 #ifndef OVERRIDE_LIBPATH
540 #define DEFAULT_LIBPATH "/lib:/usr/lib"
541 #else
542 #define DEFAULT_LIBPATH OVERRIDE_LIBPATH
543 #endif
544 #define EXTENSIONS_DIR "/lib/ext"
545
546 // Buffer that fits several sprintfs.
547 // Note that the space for the trailing null is provided
548 // by the nulls included by the sizeof operator.
549 const size_t bufsize =
550 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
551 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
552 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
553
554 // sysclasspath, java_home, dll_dir
555 {
556 char *pslash;
557 os::jvm_path(buf, bufsize);
558
559 // Found the full path to libjvm.so.
560 // Now cut the path to <java_home>/jre if we can.
561 pslash = strrchr(buf, '/');
562 if (pslash != NULL) {
563 *pslash = '\0'; // Get rid of /libjvm.so.
564 }
565 pslash = strrchr(buf, '/');
566 if (pslash != NULL) {
567 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
568 }
569 Arguments::set_dll_dir(buf);
570
571 if (pslash != NULL) {
572 pslash = strrchr(buf, '/');
573 if (pslash != NULL) {
574 *pslash = '\0'; // Get rid of /lib.
575 }
576 }
577 Arguments::set_java_home(buf);
578 if (!set_boot_path('/', ':')) {
579 vm_exit_during_initialization("Failed setting boot class path.", NULL);
580 }
581 }
582
583 // Where to look for native libraries.
584
585 // On Aix we get the user setting of LIBPATH.
586 // Eventually, all the library path setting will be done here.
587 // Get the user setting of LIBPATH.
588 const char *v = ::getenv("LIBPATH");
589 const char *v_colon = ":";
590 if (v == NULL) { v = ""; v_colon = ""; }
591
592 // Concatenate user and invariant part of ld_library_path.
593 // That's +1 for the colon and +1 for the trailing '\0'.
594 char *ld_library_path = NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
595 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
596 Arguments::set_library_path(ld_library_path);
597 FREE_C_HEAP_ARRAY(char, ld_library_path);
598
599 // Extensions directories.
600 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
601 Arguments::set_ext_dirs(buf);
602
603 FREE_C_HEAP_ARRAY(char, buf);
604
605 #undef DEFAULT_LIBPATH
606 #undef EXTENSIONS_DIR
607 }
608
609 ////////////////////////////////////////////////////////////////////////////////
610 // breakpoint support
611
612 void os::breakpoint() {
613 BREAKPOINT;
614 }
615
616 extern "C" void breakpoint() {
617 // use debugger to set breakpoint here
618 }
619
620 ////////////////////////////////////////////////////////////////////////////////
621 // signal support
622
623 debug_only(static bool signal_sets_initialized = false);
624 static sigset_t unblocked_sigs, vm_sigs;
625
626 void os::Aix::signal_sets_init() {
627 // Should also have an assertion stating we are still single-threaded.
628 assert(!signal_sets_initialized, "Already initialized");
629 // Fill in signals that are necessarily unblocked for all threads in
630 // the VM. Currently, we unblock the following signals:
631 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
632 // by -Xrs (=ReduceSignalUsage));
633 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
634 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
635 // the dispositions or masks wrt these signals.
636 // Programs embedding the VM that want to use the above signals for their
637 // own purposes must, at this time, use the "-Xrs" option to prevent
638 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
639 // (See bug 4345157, and other related bugs).
640 // In reality, though, unblocking these signals is really a nop, since
641 // these signals are not blocked by default.
642 sigemptyset(&unblocked_sigs);
643 sigaddset(&unblocked_sigs, SIGILL);
644 sigaddset(&unblocked_sigs, SIGSEGV);
645 sigaddset(&unblocked_sigs, SIGBUS);
646 sigaddset(&unblocked_sigs, SIGFPE);
647 sigaddset(&unblocked_sigs, SIGTRAP);
648 sigaddset(&unblocked_sigs, SR_signum);
649
650 if (!ReduceSignalUsage) {
651 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
652 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
653 }
654 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
655 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
656 }
657 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
658 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
659 }
660 }
661 // Fill in signals that are blocked by all but the VM thread.
662 sigemptyset(&vm_sigs);
663 if (!ReduceSignalUsage)
664 sigaddset(&vm_sigs, BREAK_SIGNAL);
665 debug_only(signal_sets_initialized = true);
666 }
667
668 // These are signals that are unblocked while a thread is running Java.
669 // (For some reason, they get blocked by default.)
670 sigset_t* os::Aix::unblocked_signals() {
671 assert(signal_sets_initialized, "Not initialized");
672 return &unblocked_sigs;
673 }
674
675 // These are the signals that are blocked while a (non-VM) thread is
676 // running Java. Only the VM thread handles these signals.
677 sigset_t* os::Aix::vm_signals() {
678 assert(signal_sets_initialized, "Not initialized");
679 return &vm_sigs;
680 }
681
682 void os::Aix::hotspot_sigmask(Thread* thread) {
683
684 //Save caller's signal mask before setting VM signal mask
685 sigset_t caller_sigmask;
686 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
687
688 OSThread* osthread = thread->osthread();
689 osthread->set_caller_sigmask(caller_sigmask);
690
691 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
692
693 if (!ReduceSignalUsage) {
694 if (thread->is_VM_thread()) {
695 // Only the VM thread handles BREAK_SIGNAL ...
696 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
697 } else {
698 // ... all other threads block BREAK_SIGNAL
699 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
700 }
701 }
702 }
703
704 // retrieve memory information.
705 // Returns false if something went wrong;
706 // content of pmi undefined in this case.
707 bool os::Aix::get_meminfo(meminfo_t* pmi) {
708
709 assert(pmi, "get_meminfo: invalid parameter");
710
711 memset(pmi, 0, sizeof(meminfo_t));
712
713 if (os::Aix::on_pase()) {
714 // On PASE, use the libo4 porting library.
715
716 unsigned long long virt_total = 0;
717 unsigned long long real_total = 0;
718 unsigned long long real_free = 0;
719 unsigned long long pgsp_total = 0;
720 unsigned long long pgsp_free = 0;
721 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
722 pmi->virt_total = virt_total;
723 pmi->real_total = real_total;
724 pmi->real_free = real_free;
725 pmi->pgsp_total = pgsp_total;
726 pmi->pgsp_free = pgsp_free;
727 return true;
728 }
729 return false;
730
731 } else {
732
733 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
734 // See:
735 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
736 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
737 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
738 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
739
740 perfstat_memory_total_t psmt;
741 memset (&psmt, '\0', sizeof(psmt));
742 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
743 if (rc == -1) {
744 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
745 assert(0, "perfstat_memory_total() failed");
746 return false;
747 }
748
749 assert(rc == 1, "perfstat_memory_total() - weird return code");
750
751 // excerpt from
752 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
753 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
754 // The fields of perfstat_memory_total_t:
755 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
756 // u_longlong_t real_total Total real memory (in 4 KB pages).
757 // u_longlong_t real_free Free real memory (in 4 KB pages).
758 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
759 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
760
761 pmi->virt_total = psmt.virt_total * 4096;
762 pmi->real_total = psmt.real_total * 4096;
763 pmi->real_free = psmt.real_free * 4096;
764 pmi->pgsp_total = psmt.pgsp_total * 4096;
765 pmi->pgsp_free = psmt.pgsp_free * 4096;
766
767 return true;
768
769 }
770 } // end os::Aix::get_meminfo
771
772 //////////////////////////////////////////////////////////////////////////////
773 // create new thread
774
775 // Thread start routine for all newly created threads
776 static void *thread_native_entry(Thread *thread) {
777
778 thread->record_stack_base_and_size();
779
780 const pthread_t pthread_id = ::pthread_self();
781 const tid_t kernel_thread_id = ::thread_self();
782
783 LogTarget(Info, os, thread) lt;
784 if (lt.is_enabled()) {
785 address low_address = thread->stack_end();
786 address high_address = thread->stack_base();
787 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
788 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
789 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
790 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
791 }
792
793 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
794 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
795 // tools hook pthread_create(). In this case, we may run into problems establishing
796 // guard pages on those stacks, because the stacks may reside in memory which is not
797 // protectable (shmated).
798 if (thread->stack_base() > ::sbrk(0)) {
799 log_warning(os, thread)("Thread stack not in data segment.");
800 }
801
802 // Try to randomize the cache line index of hot stack frames.
803 // This helps when threads of the same stack traces evict each other's
804 // cache lines. The threads can be either from the same JVM instance, or
805 // from different JVM instances. The benefit is especially true for
806 // processors with hyperthreading technology.
807
808 static int counter = 0;
809 int pid = os::current_process_id();
810 alloca(((pid ^ counter++) & 7) * 128);
811
812 thread->initialize_thread_current();
813
814 OSThread* osthread = thread->osthread();
815
816 // Thread_id is pthread id.
817 osthread->set_thread_id(pthread_id);
818
819 // .. but keep kernel thread id too for diagnostics
820 osthread->set_kernel_thread_id(kernel_thread_id);
821
822 // Initialize signal mask for this thread.
823 os::Aix::hotspot_sigmask(thread);
824
825 // Initialize floating point control register.
826 os::Aix::init_thread_fpu_state();
827
828 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
829
830 // Call one more level start routine.
831 thread->call_run();
832
833 // Note: at this point the thread object may already have deleted itself.
834 // Prevent dereferencing it from here on out.
835 thread = NULL;
836
837 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
838 os::current_thread_id(), (uintx) kernel_thread_id);
839
840 return 0;
841 }
842
843 bool os::create_thread(Thread* thread, ThreadType thr_type,
844 size_t req_stack_size) {
845
846 assert(thread->osthread() == NULL, "caller responsible");
847
848 // Allocate the OSThread object.
849 OSThread* osthread = new OSThread(NULL, NULL);
850 if (osthread == NULL) {
851 return false;
852 }
853
854 // Set the correct thread state.
855 osthread->set_thread_type(thr_type);
856
857 // Initial state is ALLOCATED but not INITIALIZED
858 osthread->set_state(ALLOCATED);
859
860 thread->set_osthread(osthread);
861
862 // Init thread attributes.
863 pthread_attr_t attr;
864 pthread_attr_init(&attr);
865 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
866
867 // Make sure we run in 1:1 kernel-user-thread mode.
868 if (os::Aix::on_aix()) {
869 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
870 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
871 }
872
873 // Start in suspended state, and in os::thread_start, wake the thread up.
874 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
875
876 // Calculate stack size if it's not specified by caller.
877 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
878
879 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
880 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
881 // This very much looks like a pthread lib error. As a workaround, increase the stack size
882 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
883 if (stack_size < 4096 * K) {
884 stack_size += 64 * K;
885 }
886
887 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
888 // thread size in attr unchanged. If this is the minimal stack size as set
889 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
890 // guard pages might not fit on the tiny stack created.
891 int ret = pthread_attr_setstacksize(&attr, stack_size);
892 if (ret != 0) {
893 log_warning(os, thread)("The %sthread stack size specified is invalid: " SIZE_FORMAT "k",
894 (thr_type == compiler_thread) ? "compiler " : ((thr_type == java_thread) ? "" : "VM "),
895 stack_size / K);
896 thread->set_osthread(NULL);
897 delete osthread;
898 return false;
899 }
900
901 // Save some cycles and a page by disabling OS guard pages where we have our own
902 // VM guard pages (in java threads). For other threads, keep system default guard
903 // pages in place.
904 if (thr_type == java_thread || thr_type == compiler_thread) {
905 ret = pthread_attr_setguardsize(&attr, 0);
906 }
907
908 pthread_t tid = 0;
909 if (ret == 0) {
910 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
911 }
912
913 if (ret == 0) {
914 char buf[64];
915 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
916 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
917 } else {
918 char buf[64];
919 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
920 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
921 // Log some OS information which might explain why creating the thread failed.
922 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads());
923 LogStream st(Log(os, thread)::info());
924 os::Posix::print_rlimit_info(&st);
925 os::print_memory_info(&st);
926 }
927
928 pthread_attr_destroy(&attr);
929
930 if (ret != 0) {
931 // Need to clean up stuff we've allocated so far.
932 thread->set_osthread(NULL);
933 delete osthread;
934 return false;
935 }
936
937 // OSThread::thread_id is the pthread id.
938 osthread->set_thread_id(tid);
939
940 return true;
941 }
942
943 /////////////////////////////////////////////////////////////////////////////
944 // attach existing thread
945
946 // bootstrap the main thread
947 bool os::create_main_thread(JavaThread* thread) {
948 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
949 return create_attached_thread(thread);
950 }
951
952 bool os::create_attached_thread(JavaThread* thread) {
953 #ifdef ASSERT
954 thread->verify_not_published();
955 #endif
956
957 // Allocate the OSThread object
958 OSThread* osthread = new OSThread(NULL, NULL);
959
960 if (osthread == NULL) {
961 return false;
962 }
963
964 const pthread_t pthread_id = ::pthread_self();
965 const tid_t kernel_thread_id = ::thread_self();
966
967 // OSThread::thread_id is the pthread id.
968 osthread->set_thread_id(pthread_id);
969
970 // .. but keep kernel thread id too for diagnostics
971 osthread->set_kernel_thread_id(kernel_thread_id);
972
973 // initialize floating point control register
974 os::Aix::init_thread_fpu_state();
975
976 // Initial thread state is RUNNABLE
977 osthread->set_state(RUNNABLE);
978
979 thread->set_osthread(osthread);
980
981 if (UseNUMA) {
982 int lgrp_id = os::numa_get_group_id();
983 if (lgrp_id != -1) {
984 thread->set_lgrp_id(lgrp_id);
985 }
986 }
987
988 // initialize signal mask for this thread
989 // and save the caller's signal mask
990 os::Aix::hotspot_sigmask(thread);
991
992 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
993 os::current_thread_id(), (uintx) kernel_thread_id);
994
995 return true;
996 }
997
998 void os::pd_start_thread(Thread* thread) {
999 int status = pthread_continue_np(thread->osthread()->pthread_id());
1000 assert(status == 0, "thr_continue failed");
1001 }
1002
1003 // Free OS resources related to the OSThread
1004 void os::free_thread(OSThread* osthread) {
1005 assert(osthread != NULL, "osthread not set");
1006
1007 // We are told to free resources of the argument thread,
1008 // but we can only really operate on the current thread.
1009 assert(Thread::current()->osthread() == osthread,
1010 "os::free_thread but not current thread");
1011
1012 // Restore caller's signal mask
1013 sigset_t sigmask = osthread->caller_sigmask();
1014 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1015
1016 delete osthread;
1017 }
1018
1019 ////////////////////////////////////////////////////////////////////////////////
1020 // time support
1021
1022 // Time since start-up in seconds to a fine granularity.
1023 // Used by VMSelfDestructTimer and the MemProfiler.
1024 double os::elapsedTime() {
1025 return ((double)os::elapsed_counter()) / os::elapsed_frequency(); // nanosecond resolution
1026 }
1027
1028 jlong os::elapsed_counter() {
1029 return javaTimeNanos() - initial_time_count;
1030 }
1031
1032 jlong os::elapsed_frequency() {
1033 return NANOSECS_PER_SEC; // nanosecond resolution
1034 }
1035
1036 bool os::supports_vtime() { return true; }
1037
1038 double os::elapsedVTime() {
1039 struct rusage usage;
1040 int retval = getrusage(RUSAGE_THREAD, &usage);
1041 if (retval == 0) {
1042 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1043 } else {
1044 // better than nothing, but not much
1045 return elapsedTime();
1046 }
1047 }
1048
1049 jlong os::javaTimeMillis() {
1050 timeval time;
1051 int status = gettimeofday(&time, NULL);
1052 assert(status != -1, "aix error at gettimeofday()");
1053 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1054 }
1055
1056 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1057 timeval time;
1058 int status = gettimeofday(&time, NULL);
1059 assert(status != -1, "aix error at gettimeofday()");
1060 seconds = jlong(time.tv_sec);
1061 nanos = jlong(time.tv_usec) * 1000;
1062 }
1063
1064 // We use mread_real_time here.
1065 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1066 // it has to be converted to real time. AIX documentations suggests to do
1067 // this unconditionally, so we do it.
1068 //
1069 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1070 //
1071 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1072 // conversion is necessary. However, mread_real_time will not return
1073 // monotonic results but merely matches read_real_time. So we need a tweak
1074 // to ensure monotonic results.
1075 //
1076 // For PASE no public documentation exists, just word by IBM
1077 jlong os::javaTimeNanos() {
1078 timebasestruct_t time;
1079 int rc = mread_real_time(&time, TIMEBASE_SZ);
1080 if (os::Aix::on_pase()) {
1081 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1082 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1083 jlong prev = max_real_time;
1084 if (now <= prev) {
1085 return prev; // same or retrograde time;
1086 }
1087 jlong obsv = Atomic::cmpxchg(&max_real_time, prev, now);
1088 assert(obsv >= prev, "invariant"); // Monotonicity
1089 // If the CAS succeeded then we're done and return "now".
1090 // If the CAS failed and the observed value "obsv" is >= now then
1091 // we should return "obsv". If the CAS failed and now > obsv > prv then
1092 // some other thread raced this thread and installed a new value, in which case
1093 // we could either (a) retry the entire operation, (b) retry trying to install now
1094 // or (c) just return obsv. We use (c). No loop is required although in some cases
1095 // we might discard a higher "now" value in deference to a slightly lower but freshly
1096 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1097 // to (a) or (b) -- and greatly reduces coherence traffic.
1098 // We might also condition (c) on the magnitude of the delta between obsv and now.
1099 // Avoiding excessive CAS operations to hot RW locations is critical.
1100 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1101 return (prev == obsv) ? now : obsv;
1102 } else {
1103 if (rc != RTC_POWER) {
1104 rc = time_base_to_time(&time, TIMEBASE_SZ);
1105 assert(rc != -1, "error calling time_base_to_time()");
1106 }
1107 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1108 }
1109 }
1110
1111 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1112 info_ptr->max_value = ALL_64_BITS;
1113 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1114 info_ptr->may_skip_backward = false;
1115 info_ptr->may_skip_forward = false;
1116 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1117 }
1118
1119 // Return the real, user, and system times in seconds from an
1120 // arbitrary fixed point in the past.
1121 bool os::getTimesSecs(double* process_real_time,
1122 double* process_user_time,
1123 double* process_system_time) {
1124 struct tms ticks;
1125 clock_t real_ticks = times(&ticks);
1126
1127 if (real_ticks == (clock_t) (-1)) {
1128 return false;
1129 } else {
1130 double ticks_per_second = (double) clock_tics_per_sec;
1131 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1132 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1133 *process_real_time = ((double) real_ticks) / ticks_per_second;
1134
1135 return true;
1136 }
1137 }
1138
1139 char * os::local_time_string(char *buf, size_t buflen) {
1140 struct tm t;
1141 time_t long_time;
1142 time(&long_time);
1143 localtime_r(&long_time, &t);
1144 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1145 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1146 t.tm_hour, t.tm_min, t.tm_sec);
1147 return buf;
1148 }
1149
1150 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1151 return localtime_r(clock, res);
1152 }
1153
1154 ////////////////////////////////////////////////////////////////////////////////
1155 // runtime exit support
1156
1157 // Note: os::shutdown() might be called very early during initialization, or
1158 // called from signal handler. Before adding something to os::shutdown(), make
1159 // sure it is async-safe and can handle partially initialized VM.
1160 void os::shutdown() {
1161
1162 // allow PerfMemory to attempt cleanup of any persistent resources
1163 perfMemory_exit();
1164
1165 // needs to remove object in file system
1166 AttachListener::abort();
1167
1168 // flush buffered output, finish log files
1169 ostream_abort();
1170
1171 // Check for abort hook
1172 abort_hook_t abort_hook = Arguments::abort_hook();
1173 if (abort_hook != NULL) {
1174 abort_hook();
1175 }
1176 }
1177
1178 // Note: os::abort() might be called very early during initialization, or
1179 // called from signal handler. Before adding something to os::abort(), make
1180 // sure it is async-safe and can handle partially initialized VM.
1181 void os::abort(bool dump_core, void* siginfo, const void* context) {
1182 os::shutdown();
1183 if (dump_core) {
1184 #ifndef PRODUCT
1185 fdStream out(defaultStream::output_fd());
1186 out.print_raw("Current thread is ");
1187 char buf[16];
1188 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1189 out.print_raw_cr(buf);
1190 out.print_raw_cr("Dumping core ...");
1191 #endif
1192 ::abort(); // dump core
1193 }
1194
1195 ::exit(1);
1196 }
1197
1198 // Die immediately, no exit hook, no abort hook, no cleanup.
1199 // Dump a core file, if possible, for debugging.
1200 void os::die() {
1201 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) {
1202 // For TimeoutInErrorHandlingTest.java, we just kill the VM
1203 // and don't take the time to generate a core file.
1204 os::signal_raise(SIGKILL);
1205 } else {
1206 ::abort();
1207 }
1208 }
1209
1210 intx os::current_thread_id() {
1211 return (intx)pthread_self();
1212 }
1213
1214 int os::current_process_id() {
1215 return getpid();
1216 }
1217
1218 // DLL functions
1219
1220 const char* os::dll_file_extension() { return ".so"; }
1221
1222 // This must be hard coded because it's the system's temporary
1223 // directory not the java application's temp directory, ala java.io.tmpdir.
1224 const char* os::get_temp_directory() { return "/tmp"; }
1225
1226 // Check if addr is inside libjvm.so.
1227 bool os::address_is_in_vm(address addr) {
1228
1229 // Input could be a real pc or a function pointer literal. The latter
1230 // would be a function descriptor residing in the data segment of a module.
1231 loaded_module_t lm;
1232 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1233 return lm.is_in_vm;
1234 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1235 return lm.is_in_vm;
1236 } else {
1237 return false;
1238 }
1239
1240 }
1241
1242 // Resolve an AIX function descriptor literal to a code pointer.
1243 // If the input is a valid code pointer to a text segment of a loaded module,
1244 // it is returned unchanged.
1245 // If the input is a valid AIX function descriptor, it is resolved to the
1246 // code entry point.
1247 // If the input is neither a valid function descriptor nor a valid code pointer,
1248 // NULL is returned.
1249 static address resolve_function_descriptor_to_code_pointer(address p) {
1250
1251 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1252 // It is a real code pointer.
1253 return p;
1254 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1255 // Pointer to data segment, potential function descriptor.
1256 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1257 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1258 // It is a function descriptor.
1259 return code_entry;
1260 }
1261 }
1262
1263 return NULL;
1264 }
1265
1266 bool os::dll_address_to_function_name(address addr, char *buf,
1267 int buflen, int *offset,
1268 bool demangle) {
1269 if (offset) {
1270 *offset = -1;
1271 }
1272 // Buf is not optional, but offset is optional.
1273 assert(buf != NULL, "sanity check");
1274 buf[0] = '\0';
1275
1276 // Resolve function ptr literals first.
1277 addr = resolve_function_descriptor_to_code_pointer(addr);
1278 if (!addr) {
1279 return false;
1280 }
1281
1282 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1283 }
1284
1285 bool os::dll_address_to_library_name(address addr, char* buf,
1286 int buflen, int* offset) {
1287 if (offset) {
1288 *offset = -1;
1289 }
1290 // Buf is not optional, but offset is optional.
1291 assert(buf != NULL, "sanity check");
1292 buf[0] = '\0';
1293
1294 // Resolve function ptr literals first.
1295 addr = resolve_function_descriptor_to_code_pointer(addr);
1296 if (!addr) {
1297 return false;
1298 }
1299
1300 return AixSymbols::get_module_name(addr, buf, buflen);
1301 }
1302
1303 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1304 // for the same architecture as Hotspot is running on.
1305 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1306
1307 log_info(os)("attempting shared library load of %s", filename);
1308
1309 if (ebuf && ebuflen > 0) {
1310 ebuf[0] = '\0';
1311 ebuf[ebuflen - 1] = '\0';
1312 }
1313
1314 if (!filename || strlen(filename) == 0) {
1315 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1316 return NULL;
1317 }
1318
1319 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1320 void * result= ::dlopen(filename, RTLD_LAZY);
1321 if (result != NULL) {
1322 Events::log(NULL, "Loaded shared library %s", filename);
1323 // Reload dll cache. Don't do this in signal handling.
1324 LoadedLibraries::reload();
1325 log_info(os)("shared library load of %s was successful", filename);
1326 return result;
1327 } else {
1328 // error analysis when dlopen fails
1329 const char* error_report = ::dlerror();
1330 if (error_report == NULL) {
1331 error_report = "dlerror returned no error description";
1332 }
1333 if (ebuf != NULL && ebuflen > 0) {
1334 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1335 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1336 }
1337 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report);
1338 log_info(os)("shared library load of %s failed, %s", filename, error_report);
1339 }
1340 return NULL;
1341 }
1342
1343 void* os::dll_lookup(void* handle, const char* name) {
1344 void* res = dlsym(handle, name);
1345 return res;
1346 }
1347
1348 void* os::get_default_process_handle() {
1349 return (void*)::dlopen(NULL, RTLD_LAZY);
1350 }
1351
1352 void os::print_dll_info(outputStream *st) {
1353 st->print_cr("Dynamic libraries:");
1354 LoadedLibraries::print(st);
1355 }
1356
1357 void os::get_summary_os_info(char* buf, size_t buflen) {
1358 // There might be something more readable than uname results for AIX.
1359 struct utsname name;
1360 uname(&name);
1361 snprintf(buf, buflen, "%s %s", name.release, name.version);
1362 }
1363
1364 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1365 // Not yet implemented.
1366 return 0;
1367 }
1368
1369 void os::print_os_info_brief(outputStream* st) {
1370 uint32_t ver = os::Aix::os_version();
1371 st->print_cr("AIX kernel version %u.%u.%u.%u",
1372 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1373
1374 os::Posix::print_uname_info(st);
1375
1376 // Linux uses print_libversion_info(st); here.
1377 }
1378
1379 void os::print_os_info(outputStream* st) {
1380 st->print("OS:");
1381
1382 os::Posix::print_uname_info(st);
1383
1384 uint32_t ver = os::Aix::os_version();
1385 st->print_cr("AIX kernel version %u.%u.%u.%u",
1386 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1387
1388 os::Posix::print_rlimit_info(st);
1389
1390 os::Posix::print_load_average(st);
1391
1392 // _SC_THREAD_THREADS_MAX is the maximum number of threads within a process.
1393 long tmax = sysconf(_SC_THREAD_THREADS_MAX);
1394 st->print_cr("maximum #threads within a process:%ld", tmax);
1395
1396 // print wpar info
1397 libperfstat::wparinfo_t wi;
1398 if (libperfstat::get_wparinfo(&wi)) {
1399 st->print_cr("wpar info");
1400 st->print_cr("name: %s", wi.name);
1401 st->print_cr("id: %d", wi.wpar_id);
1402 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1403 }
1404
1405 VM_Version::print_platform_virtualization_info(st);
1406 }
1407
1408 void os::print_memory_info(outputStream* st) {
1409
1410 st->print_cr("Memory:");
1411
1412 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1413 describe_pagesize(g_multipage_support.pagesize));
1414 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1415 describe_pagesize(g_multipage_support.datapsize));
1416 st->print_cr(" Text page size: %s",
1417 describe_pagesize(g_multipage_support.textpsize));
1418 st->print_cr(" Thread stack page size (pthread): %s",
1419 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1420 st->print_cr(" Default shared memory page size: %s",
1421 describe_pagesize(g_multipage_support.shmpsize));
1422 st->print_cr(" Can use 64K pages dynamically with shared memory: %s",
1423 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1424 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1425 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1426 st->print_cr(" Multipage error: %d",
1427 g_multipage_support.error);
1428 st->cr();
1429 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1430
1431 // print out LDR_CNTRL because it affects the default page sizes
1432 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1433 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1434
1435 // Print out EXTSHM because it is an unsupported setting.
1436 const char* const extshm = ::getenv("EXTSHM");
1437 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1438 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1439 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1440 }
1441
1442 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1443 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1444 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1445 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1446 st->cr();
1447
1448 os::Aix::meminfo_t mi;
1449 if (os::Aix::get_meminfo(&mi)) {
1450 if (os::Aix::on_aix()) {
1451 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1452 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1453 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1454 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1455 } else {
1456 // PASE - Numbers are result of QWCRSSTS; they mean:
1457 // real_total: Sum of all system pools
1458 // real_free: always 0
1459 // pgsp_total: we take the size of the system ASP
1460 // pgsp_free: size of system ASP times percentage of system ASP unused
1461 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1462 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1463 st->print_cr("%% system asp used : %.2f",
1464 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1465 }
1466 }
1467 st->cr();
1468
1469 // Print program break.
1470 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1471 address brk_now = (address)::sbrk(0);
1472 if (brk_now != (address)-1) {
1473 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1474 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1475 }
1476 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1477 st->cr();
1478
1479 // Print segments allocated with os::reserve_memory.
1480 st->print_cr("internal virtual memory regions used by vm:");
1481 vmembk_print_on(st);
1482 }
1483
1484 // Get a string for the cpuinfo that is a summary of the cpu type
1485 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1486 // read _system_configuration.version
1487 switch (_system_configuration.version) {
1488 case PV_9:
1489 strncpy(buf, "Power PC 9", buflen);
1490 break;
1491 case PV_8:
1492 strncpy(buf, "Power PC 8", buflen);
1493 break;
1494 case PV_7:
1495 strncpy(buf, "Power PC 7", buflen);
1496 break;
1497 case PV_6_1:
1498 strncpy(buf, "Power PC 6 DD1.x", buflen);
1499 break;
1500 case PV_6:
1501 strncpy(buf, "Power PC 6", buflen);
1502 break;
1503 case PV_5:
1504 strncpy(buf, "Power PC 5", buflen);
1505 break;
1506 case PV_5_2:
1507 strncpy(buf, "Power PC 5_2", buflen);
1508 break;
1509 case PV_5_3:
1510 strncpy(buf, "Power PC 5_3", buflen);
1511 break;
1512 case PV_5_Compat:
1513 strncpy(buf, "PV_5_Compat", buflen);
1514 break;
1515 case PV_6_Compat:
1516 strncpy(buf, "PV_6_Compat", buflen);
1517 break;
1518 case PV_7_Compat:
1519 strncpy(buf, "PV_7_Compat", buflen);
1520 break;
1521 case PV_8_Compat:
1522 strncpy(buf, "PV_8_Compat", buflen);
1523 break;
1524 case PV_9_Compat:
1525 strncpy(buf, "PV_9_Compat", buflen);
1526 break;
1527 default:
1528 strncpy(buf, "unknown", buflen);
1529 }
1530 }
1531
1532 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1533 // Nothing to do beyond of what os::print_cpu_info() does.
1534 }
1535
1536 static void print_signal_handler(outputStream* st, int sig,
1537 char* buf, size_t buflen);
1538
1539 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1540 st->print_cr("Signal Handlers:");
1541 print_signal_handler(st, SIGSEGV, buf, buflen);
1542 print_signal_handler(st, SIGBUS , buf, buflen);
1543 print_signal_handler(st, SIGFPE , buf, buflen);
1544 print_signal_handler(st, SIGPIPE, buf, buflen);
1545 print_signal_handler(st, SIGXFSZ, buf, buflen);
1546 print_signal_handler(st, SIGILL , buf, buflen);
1547 print_signal_handler(st, SR_signum, buf, buflen);
1548 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1549 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1550 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1551 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1552 print_signal_handler(st, SIGTRAP, buf, buflen);
1553 // We also want to know if someone else adds a SIGDANGER handler because
1554 // that will interfere with OOM killling.
1555 print_signal_handler(st, SIGDANGER, buf, buflen);
1556 }
1557
1558 static char saved_jvm_path[MAXPATHLEN] = {0};
1559
1560 // Find the full path to the current module, libjvm.so.
1561 void os::jvm_path(char *buf, jint buflen) {
1562 // Error checking.
1563 if (buflen < MAXPATHLEN) {
1564 assert(false, "must use a large-enough buffer");
1565 buf[0] = '\0';
1566 return;
1567 }
1568 // Lazy resolve the path to current module.
1569 if (saved_jvm_path[0] != 0) {
1570 strcpy(buf, saved_jvm_path);
1571 return;
1572 }
1573
1574 Dl_info dlinfo;
1575 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1576 assert(ret != 0, "cannot locate libjvm");
1577 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1578 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1579
1580 if (Arguments::sun_java_launcher_is_altjvm()) {
1581 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1582 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1583 // If "/jre/lib/" appears at the right place in the string, then
1584 // assume we are installed in a JDK and we're done. Otherwise, check
1585 // for a JAVA_HOME environment variable and fix up the path so it
1586 // looks like libjvm.so is installed there (append a fake suffix
1587 // hotspot/libjvm.so).
1588 const char *p = buf + strlen(buf) - 1;
1589 for (int count = 0; p > buf && count < 4; ++count) {
1590 for (--p; p > buf && *p != '/'; --p)
1591 /* empty */ ;
1592 }
1593
1594 if (strncmp(p, "/jre/lib/", 9) != 0) {
1595 // Look for JAVA_HOME in the environment.
1596 char* java_home_var = ::getenv("JAVA_HOME");
1597 if (java_home_var != NULL && java_home_var[0] != 0) {
1598 char* jrelib_p;
1599 int len;
1600
1601 // Check the current module name "libjvm.so".
1602 p = strrchr(buf, '/');
1603 if (p == NULL) {
1604 return;
1605 }
1606 assert(strstr(p, "/libjvm") == p, "invalid library name");
1607
1608 rp = os::Posix::realpath(java_home_var, buf, buflen);
1609 if (rp == NULL) {
1610 return;
1611 }
1612
1613 // determine if this is a legacy image or modules image
1614 // modules image doesn't have "jre" subdirectory
1615 len = strlen(buf);
1616 assert(len < buflen, "Ran out of buffer room");
1617 jrelib_p = buf + len;
1618 snprintf(jrelib_p, buflen-len, "/jre/lib");
1619 if (0 != access(buf, F_OK)) {
1620 snprintf(jrelib_p, buflen-len, "/lib");
1621 }
1622
1623 if (0 == access(buf, F_OK)) {
1624 // Use current module name "libjvm.so"
1625 len = strlen(buf);
1626 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1627 } else {
1628 // Go back to path of .so
1629 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1630 if (rp == NULL) {
1631 return;
1632 }
1633 }
1634 }
1635 }
1636 }
1637
1638 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1639 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1640 }
1641
1642 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1643 // no prefix required, not even "_"
1644 }
1645
1646 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1647 // no suffix required
1648 }
1649
1650 ////////////////////////////////////////////////////////////////////////////////
1651 // sun.misc.Signal support
1652
1653 static void
1654 UserHandler(int sig, void *siginfo, void *context) {
1655 // Ctrl-C is pressed during error reporting, likely because the error
1656 // handler fails to abort. Let VM die immediately.
1657 if (sig == SIGINT && VMError::is_error_reported()) {
1658 os::die();
1659 }
1660
1661 os::signal_notify(sig);
1662 }
1663
1664 void* os::user_handler() {
1665 return CAST_FROM_FN_PTR(void*, UserHandler);
1666 }
1667
1668 extern "C" {
1669 typedef void (*sa_handler_t)(int);
1670 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1671 }
1672
1673 void* os::signal(int signal_number, void* handler) {
1674 struct sigaction sigAct, oldSigAct;
1675
1676 sigfillset(&(sigAct.sa_mask));
1677
1678 // Do not block out synchronous signals in the signal handler.
1679 // Blocking synchronous signals only makes sense if you can really
1680 // be sure that those signals won't happen during signal handling,
1681 // when the blocking applies. Normal signal handlers are lean and
1682 // do not cause signals. But our signal handlers tend to be "risky"
1683 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1684 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1685 // by a SIGILL, which was blocked due to the signal mask. The process
1686 // just hung forever. Better to crash from a secondary signal than to hang.
1687 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1688 sigdelset(&(sigAct.sa_mask), SIGBUS);
1689 sigdelset(&(sigAct.sa_mask), SIGILL);
1690 sigdelset(&(sigAct.sa_mask), SIGFPE);
1691 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1692
1693 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1694
1695 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1696
1697 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1698 // -1 means registration failed
1699 return (void *)-1;
1700 }
1701
1702 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1703 }
1704
1705 void os::signal_raise(int signal_number) {
1706 ::raise(signal_number);
1707 }
1708
1709 //
1710 // The following code is moved from os.cpp for making this
1711 // code platform specific, which it is by its very nature.
1712 //
1713
1714 // Will be modified when max signal is changed to be dynamic
1715 int os::sigexitnum_pd() {
1716 return NSIG;
1717 }
1718
1719 // a counter for each possible signal value
1720 static volatile jint pending_signals[NSIG+1] = { 0 };
1721
1722 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1723 // On AIX, we use sem_init(), sem_post(), sem_wait()
1724 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1725 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1726 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1727 // on AIX, msem_..() calls are suspected of causing problems.
1728 static sem_t sig_sem;
1729 static msemaphore* p_sig_msem = 0;
1730
1731 static void local_sem_init() {
1732 if (os::Aix::on_aix()) {
1733 int rc = ::sem_init(&sig_sem, 0, 0);
1734 guarantee(rc != -1, "sem_init failed");
1735 } else {
1736 // Memory semaphores must live in shared mem.
1737 guarantee0(p_sig_msem == NULL);
1738 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1739 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1740 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1741 }
1742 }
1743
1744 static void local_sem_post() {
1745 static bool warn_only_once = false;
1746 if (os::Aix::on_aix()) {
1747 int rc = ::sem_post(&sig_sem);
1748 if (rc == -1 && !warn_only_once) {
1749 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1750 warn_only_once = true;
1751 }
1752 } else {
1753 guarantee0(p_sig_msem != NULL);
1754 int rc = ::msem_unlock(p_sig_msem, 0);
1755 if (rc == -1 && !warn_only_once) {
1756 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1757 warn_only_once = true;
1758 }
1759 }
1760 }
1761
1762 static void local_sem_wait() {
1763 static bool warn_only_once = false;
1764 if (os::Aix::on_aix()) {
1765 int rc = ::sem_wait(&sig_sem);
1766 if (rc == -1 && !warn_only_once) {
1767 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1768 warn_only_once = true;
1769 }
1770 } else {
1771 guarantee0(p_sig_msem != NULL); // must init before use
1772 int rc = ::msem_lock(p_sig_msem, 0);
1773 if (rc == -1 && !warn_only_once) {
1774 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1775 warn_only_once = true;
1776 }
1777 }
1778 }
1779
1780 static void jdk_misc_signal_init() {
1781 // Initialize signal structures
1782 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1783
1784 // Initialize signal semaphore
1785 local_sem_init();
1786 }
1787
1788 void os::signal_notify(int sig) {
1789 Atomic::inc(&pending_signals[sig]);
1790 local_sem_post();
1791 }
1792
1793 static int check_pending_signals() {
1794 for (;;) {
1795 for (int i = 0; i < NSIG + 1; i++) {
1796 jint n = pending_signals[i];
1797 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) {
1798 return i;
1799 }
1800 }
1801 JavaThread *thread = JavaThread::current();
1802 ThreadBlockInVM tbivm(thread);
1803
1804 bool threadIsSuspended;
1805 do {
1806 thread->set_suspend_equivalent();
1807 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1808
1809 local_sem_wait();
1810
1811 // were we externally suspended while we were waiting?
1812 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1813 if (threadIsSuspended) {
1814 //
1815 // The semaphore has been incremented, but while we were waiting
1816 // another thread suspended us. We don't want to continue running
1817 // while suspended because that would surprise the thread that
1818 // suspended us.
1819 //
1820
1821 local_sem_post();
1822
1823 thread->java_suspend_self();
1824 }
1825 } while (threadIsSuspended);
1826 }
1827 }
1828
1829 int os::signal_wait() {
1830 return check_pending_signals();
1831 }
1832
1833 ////////////////////////////////////////////////////////////////////////////////
1834 // Virtual Memory
1835
1836 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1837
1838 #define VMEM_MAPPED 1
1839 #define VMEM_SHMATED 2
1840
1841 struct vmembk_t {
1842 int type; // 1 - mmap, 2 - shmat
1843 char* addr;
1844 size_t size; // Real size, may be larger than usersize.
1845 size_t pagesize; // page size of area
1846 vmembk_t* next;
1847
1848 bool contains_addr(char* p) const {
1849 return p >= addr && p < (addr + size);
1850 }
1851
1852 bool contains_range(char* p, size_t s) const {
1853 return contains_addr(p) && contains_addr(p + s - 1);
1854 }
1855
1856 void print_on(outputStream* os) const {
1857 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1858 " bytes, %d %s pages), %s",
1859 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1860 (type == VMEM_SHMATED ? "shmat" : "mmap")
1861 );
1862 }
1863
1864 // Check that range is a sub range of memory block (or equal to memory block);
1865 // also check that range is fully page aligned to the page size if the block.
1866 void assert_is_valid_subrange(char* p, size_t s) const {
1867 if (!contains_range(p, s)) {
1868 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1869 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1870 p2i(p), p2i(p + s), p2i(addr), p2i(addr + size));
1871 guarantee0(false);
1872 }
1873 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1874 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1875 " aligned to pagesize (%lu)", p2i(p), p2i(p + s), (unsigned long) pagesize);
1876 guarantee0(false);
1877 }
1878 }
1879 };
1880
1881 static struct {
1882 vmembk_t* first;
1883 MiscUtils::CritSect cs;
1884 } vmem;
1885
1886 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1887 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1888 assert0(p);
1889 if (p) {
1890 MiscUtils::AutoCritSect lck(&vmem.cs);
1891 p->addr = addr; p->size = size;
1892 p->pagesize = pagesize;
1893 p->type = type;
1894 p->next = vmem.first;
1895 vmem.first = p;
1896 }
1897 }
1898
1899 static vmembk_t* vmembk_find(char* addr) {
1900 MiscUtils::AutoCritSect lck(&vmem.cs);
1901 for (vmembk_t* p = vmem.first; p; p = p->next) {
1902 if (p->addr <= addr && (p->addr + p->size) > addr) {
1903 return p;
1904 }
1905 }
1906 return NULL;
1907 }
1908
1909 static void vmembk_remove(vmembk_t* p0) {
1910 MiscUtils::AutoCritSect lck(&vmem.cs);
1911 assert0(p0);
1912 assert0(vmem.first); // List should not be empty.
1913 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1914 if (*pp == p0) {
1915 *pp = p0->next;
1916 ::free(p0);
1917 return;
1918 }
1919 }
1920 assert0(false); // Not found?
1921 }
1922
1923 static void vmembk_print_on(outputStream* os) {
1924 MiscUtils::AutoCritSect lck(&vmem.cs);
1925 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1926 vmi->print_on(os);
1927 os->cr();
1928 }
1929 }
1930
1931 // Reserve and attach a section of System V memory.
1932 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1933 // address. Failing that, it will attach the memory anywhere.
1934 // If <requested_addr> is NULL, function will attach the memory anywhere.
1935 //
1936 // <alignment_hint> is being ignored by this function. It is very probable however that the
1937 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1938 // Should this be not enogh, we can put more work into it.
1939 static char* reserve_shmated_memory (
1940 size_t bytes,
1941 char* requested_addr,
1942 size_t alignment_hint) {
1943
1944 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1945 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1946 bytes, p2i(requested_addr), alignment_hint);
1947
1948 // Either give me wish address or wish alignment but not both.
1949 assert0(!(requested_addr != NULL && alignment_hint != 0));
1950
1951 // We must prevent anyone from attaching too close to the
1952 // BRK because that may cause malloc OOM.
1953 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1954 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1955 "Will attach anywhere.", p2i(requested_addr));
1956 // Act like the OS refused to attach there.
1957 requested_addr = NULL;
1958 }
1959
1960 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1961 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1962 if (os::Aix::on_pase_V5R4_or_older()) {
1963 ShouldNotReachHere();
1964 }
1965
1966 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1967 const size_t size = align_up(bytes, 64*K);
1968
1969 // Reserve the shared segment.
1970 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1971 if (shmid == -1) {
1972 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1973 return NULL;
1974 }
1975
1976 // Important note:
1977 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1978 // We must right after attaching it remove it from the system. System V shm segments are global and
1979 // survive the process.
1980 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1981
1982 struct shmid_ds shmbuf;
1983 memset(&shmbuf, 0, sizeof(shmbuf));
1984 shmbuf.shm_pagesize = 64*K;
1985 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1986 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1987 size / (64*K), errno);
1988 // I want to know if this ever happens.
1989 assert(false, "failed to set page size for shmat");
1990 }
1991
1992 // Now attach the shared segment.
1993 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1994 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1995 // were not a segment boundary.
1996 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1997 const int errno_shmat = errno;
1998
1999 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2000 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2001 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2002 assert(false, "failed to remove shared memory segment!");
2003 }
2004
2005 // Handle shmat error. If we failed to attach, just return.
2006 if (addr == (char*)-1) {
2007 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", p2i(requested_addr), errno_shmat);
2008 return NULL;
2009 }
2010
2011 // Just for info: query the real page size. In case setting the page size did not
2012 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2013 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2014 if (real_pagesize != shmbuf.shm_pagesize) {
2015 trcVerbose("pagesize is, surprisingly, " SIZE_FORMAT, real_pagesize);
2016 }
2017
2018 if (addr) {
2019 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2020 p2i(addr), p2i(addr + size - 1), size, size/real_pagesize, describe_pagesize(real_pagesize));
2021 } else {
2022 if (requested_addr != NULL) {
2023 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, p2i(requested_addr));
2024 } else {
2025 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2026 }
2027 }
2028
2029 // book-keeping
2030 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2031 assert0(is_aligned_to(addr, os::vm_page_size()));
2032
2033 return addr;
2034 }
2035
2036 static bool release_shmated_memory(char* addr, size_t size) {
2037
2038 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2039 p2i(addr), p2i(addr + size - 1));
2040
2041 bool rc = false;
2042
2043 // TODO: is there a way to verify shm size without doing bookkeeping?
2044 if (::shmdt(addr) != 0) {
2045 trcVerbose("error (%d).", errno);
2046 } else {
2047 trcVerbose("ok.");
2048 rc = true;
2049 }
2050 return rc;
2051 }
2052
2053 static bool uncommit_shmated_memory(char* addr, size_t size) {
2054 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2055 p2i(addr), p2i(addr + size - 1));
2056
2057 const bool rc = my_disclaim64(addr, size);
2058
2059 if (!rc) {
2060 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", p2i(addr), size);
2061 return false;
2062 }
2063 return true;
2064 }
2065
2066 //////////////////////////////// mmap-based routines /////////////////////////////////
2067
2068 // Reserve memory via mmap.
2069 // If <requested_addr> is given, an attempt is made to attach at the given address.
2070 // Failing that, memory is allocated at any address.
2071 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2072 // allocate at an address aligned with the given alignment. Failing that, memory
2073 // is aligned anywhere.
2074 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2075 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2076 "alignment_hint " UINTX_FORMAT "...",
2077 bytes, p2i(requested_addr), alignment_hint);
2078
2079 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2080 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2081 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", p2i(requested_addr));
2082 return NULL;
2083 }
2084
2085 // We must prevent anyone from attaching too close to the
2086 // BRK because that may cause malloc OOM.
2087 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2088 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2089 "Will attach anywhere.", p2i(requested_addr));
2090 // Act like the OS refused to attach there.
2091 requested_addr = NULL;
2092 }
2093
2094 // Specify one or the other but not both.
2095 assert0(!(requested_addr != NULL && alignment_hint > 0));
2096
2097 // In 64K mode, we claim the global page size (os::vm_page_size())
2098 // is 64K. This is one of the few points where that illusion may
2099 // break, because mmap() will always return memory aligned to 4K. So
2100 // we must ensure we only ever return memory aligned to 64k.
2101 if (alignment_hint) {
2102 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2103 } else {
2104 alignment_hint = os::vm_page_size();
2105 }
2106
2107 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2108 const size_t size = align_up(bytes, os::vm_page_size());
2109
2110 // alignment: Allocate memory large enough to include an aligned range of the right size and
2111 // cut off the leading and trailing waste pages.
2112 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2113 const size_t extra_size = size + alignment_hint;
2114
2115 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2116 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2117 int flags = MAP_ANONYMOUS | MAP_SHARED;
2118
2119 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2120 // it means if wishaddress is given but MAP_FIXED is not set.
2121 //
2122 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2123 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2124 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2125 // get clobbered.
2126 if (requested_addr != NULL) {
2127 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2128 flags |= MAP_FIXED;
2129 }
2130 }
2131
2132 char* addr = (char*)::mmap(requested_addr, extra_size,
2133 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2134
2135 if (addr == MAP_FAILED) {
2136 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", p2i(requested_addr), size, errno);
2137 return NULL;
2138 }
2139
2140 // Handle alignment.
2141 char* const addr_aligned = align_up(addr, alignment_hint);
2142 const size_t waste_pre = addr_aligned - addr;
2143 char* const addr_aligned_end = addr_aligned + size;
2144 const size_t waste_post = extra_size - waste_pre - size;
2145 if (waste_pre > 0) {
2146 ::munmap(addr, waste_pre);
2147 }
2148 if (waste_post > 0) {
2149 ::munmap(addr_aligned_end, waste_post);
2150 }
2151 addr = addr_aligned;
2152
2153 if (addr) {
2154 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2155 p2i(addr), p2i(addr + bytes), bytes);
2156 } else {
2157 if (requested_addr != NULL) {
2158 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, p2i(requested_addr));
2159 } else {
2160 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2161 }
2162 }
2163
2164 // bookkeeping
2165 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2166
2167 // Test alignment, see above.
2168 assert0(is_aligned_to(addr, os::vm_page_size()));
2169
2170 return addr;
2171 }
2172
2173 static bool release_mmaped_memory(char* addr, size_t size) {
2174 assert0(is_aligned_to(addr, os::vm_page_size()));
2175 assert0(is_aligned_to(size, os::vm_page_size()));
2176
2177 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2178 p2i(addr), p2i(addr + size - 1));
2179 bool rc = false;
2180
2181 if (::munmap(addr, size) != 0) {
2182 trcVerbose("failed (%d)\n", errno);
2183 rc = false;
2184 } else {
2185 trcVerbose("ok.");
2186 rc = true;
2187 }
2188
2189 return rc;
2190 }
2191
2192 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2193
2194 assert0(is_aligned_to(addr, os::vm_page_size()));
2195 assert0(is_aligned_to(size, os::vm_page_size()));
2196
2197 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2198 p2i(addr), p2i(addr + size - 1));
2199 bool rc = false;
2200
2201 // Uncommit mmap memory with msync MS_INVALIDATE.
2202 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2203 trcVerbose("failed (%d)\n", errno);
2204 rc = false;
2205 } else {
2206 trcVerbose("ok.");
2207 rc = true;
2208 }
2209
2210 return rc;
2211 }
2212
2213 int os::vm_page_size() {
2214 // Seems redundant as all get out.
2215 assert(os::Aix::page_size() != -1, "must call os::init");
2216 return os::Aix::page_size();
2217 }
2218
2219 // Aix allocates memory by pages.
2220 int os::vm_allocation_granularity() {
2221 assert(os::Aix::page_size() != -1, "must call os::init");
2222 return os::Aix::page_size();
2223 }
2224
2225 #ifdef PRODUCT
2226 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2227 int err) {
2228 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2229 ", %d) failed; error='%s' (errno=%d)", p2i(addr), size, exec,
2230 os::errno_name(err), err);
2231 }
2232 #endif
2233
2234 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2235 const char* mesg) {
2236 assert(mesg != NULL, "mesg must be specified");
2237 if (!pd_commit_memory(addr, size, exec)) {
2238 // Add extra info in product mode for vm_exit_out_of_memory():
2239 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2240 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2241 }
2242 }
2243
2244 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2245
2246 assert(is_aligned_to(addr, os::vm_page_size()),
2247 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2248 p2i(addr), os::vm_page_size());
2249 assert(is_aligned_to(size, os::vm_page_size()),
2250 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2251 size, os::vm_page_size());
2252
2253 vmembk_t* const vmi = vmembk_find(addr);
2254 guarantee0(vmi);
2255 vmi->assert_is_valid_subrange(addr, size);
2256
2257 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", p2i(addr), p2i(addr + size - 1));
2258
2259 if (UseExplicitCommit) {
2260 // AIX commits memory on touch. So, touch all pages to be committed.
2261 for (char* p = addr; p < (addr + size); p += 4*K) {
2262 *p = '\0';
2263 }
2264 }
2265
2266 return true;
2267 }
2268
2269 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2270 return pd_commit_memory(addr, size, exec);
2271 }
2272
2273 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2274 size_t alignment_hint, bool exec,
2275 const char* mesg) {
2276 // Alignment_hint is ignored on this OS.
2277 pd_commit_memory_or_exit(addr, size, exec, mesg);
2278 }
2279
2280 bool os::pd_uncommit_memory(char* addr, size_t size) {
2281 assert(is_aligned_to(addr, os::vm_page_size()),
2282 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2283 p2i(addr), os::vm_page_size());
2284 assert(is_aligned_to(size, os::vm_page_size()),
2285 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2286 size, os::vm_page_size());
2287
2288 // Dynamically do different things for mmap/shmat.
2289 const vmembk_t* const vmi = vmembk_find(addr);
2290 guarantee0(vmi);
2291 vmi->assert_is_valid_subrange(addr, size);
2292
2293 if (vmi->type == VMEM_SHMATED) {
2294 return uncommit_shmated_memory(addr, size);
2295 } else {
2296 return uncommit_mmaped_memory(addr, size);
2297 }
2298 }
2299
2300 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2301 // Do not call this; no need to commit stack pages on AIX.
2302 ShouldNotReachHere();
2303 return true;
2304 }
2305
2306 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2307 // Do not call this; no need to commit stack pages on AIX.
2308 ShouldNotReachHere();
2309 return true;
2310 }
2311
2312 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2313 }
2314
2315 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2316 }
2317
2318 void os::numa_make_global(char *addr, size_t bytes) {
2319 }
2320
2321 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2322 }
2323
2324 bool os::numa_topology_changed() {
2325 return false;
2326 }
2327
2328 size_t os::numa_get_groups_num() {
2329 return 1;
2330 }
2331
2332 int os::numa_get_group_id() {
2333 return 0;
2334 }
2335
2336 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2337 if (size > 0) {
2338 ids[0] = 0;
2339 return 1;
2340 }
2341 return 0;
2342 }
2343
2344 int os::numa_get_group_id_for_address(const void* address) {
2345 return 0;
2346 }
2347
2348 bool os::get_page_info(char *start, page_info* info) {
2349 return false;
2350 }
2351
2352 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2353 return end;
2354 }
2355
2356 // Reserves and attaches a shared memory segment.
2357 // Will assert if a wish address is given and could not be obtained.
2358 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2359
2360 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2361 // thereby clobbering old mappings at that place. That is probably
2362 // not intended, never used and almost certainly an error were it
2363 // ever be used this way (to try attaching at a specified address
2364 // without clobbering old mappings an alternate API exists,
2365 // os::attempt_reserve_memory_at()).
2366 // Instead of mimicking the dangerous coding of the other platforms, here I
2367 // just ignore the request address (release) or assert(debug).
2368 assert0(requested_addr == NULL);
2369
2370 // Always round to os::vm_page_size(), which may be larger than 4K.
2371 bytes = align_up(bytes, os::vm_page_size());
2372 const size_t alignment_hint0 =
2373 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2374
2375 // In 4K mode always use mmap.
2376 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2377 if (os::vm_page_size() == 4*K) {
2378 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2379 } else {
2380 if (bytes >= Use64KPagesThreshold) {
2381 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2382 } else {
2383 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2384 }
2385 }
2386 }
2387
2388 bool os::pd_release_memory(char* addr, size_t size) {
2389
2390 // Dynamically do different things for mmap/shmat.
2391 vmembk_t* const vmi = vmembk_find(addr);
2392 guarantee0(vmi);
2393
2394 // Always round to os::vm_page_size(), which may be larger than 4K.
2395 size = align_up(size, os::vm_page_size());
2396 addr = align_up(addr, os::vm_page_size());
2397
2398 bool rc = false;
2399 bool remove_bookkeeping = false;
2400 if (vmi->type == VMEM_SHMATED) {
2401 // For shmatted memory, we do:
2402 // - If user wants to release the whole range, release the memory (shmdt).
2403 // - If user only wants to release a partial range, uncommit (disclaim) that
2404 // range. That way, at least, we do not use memory anymore (bust still page
2405 // table space).
2406 vmi->assert_is_valid_subrange(addr, size);
2407 if (addr == vmi->addr && size == vmi->size) {
2408 rc = release_shmated_memory(addr, size);
2409 remove_bookkeeping = true;
2410 } else {
2411 rc = uncommit_shmated_memory(addr, size);
2412 }
2413 } else {
2414 // User may unmap partial regions but region has to be fully contained.
2415 #ifdef ASSERT
2416 vmi->assert_is_valid_subrange(addr, size);
2417 #endif
2418 rc = release_mmaped_memory(addr, size);
2419 remove_bookkeeping = true;
2420 }
2421
2422 // update bookkeeping
2423 if (rc && remove_bookkeeping) {
2424 vmembk_remove(vmi);
2425 }
2426
2427 return rc;
2428 }
2429
2430 static bool checked_mprotect(char* addr, size_t size, int prot) {
2431
2432 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2433 // not tell me if protection failed when trying to protect an un-protectable range.
2434 //
2435 // This means if the memory was allocated using shmget/shmat, protection wont work
2436 // but mprotect will still return 0:
2437 //
2438 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2439
2440 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2441 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2442
2443 if (!rc) {
2444 const char* const s_errno = os::errno_name(errno);
2445 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2446 return false;
2447 }
2448
2449 // mprotect success check
2450 //
2451 // Mprotect said it changed the protection but can I believe it?
2452 //
2453 // To be sure I need to check the protection afterwards. Try to
2454 // read from protected memory and check whether that causes a segfault.
2455 //
2456 if (!os::Aix::xpg_sus_mode()) {
2457
2458 if (CanUseSafeFetch32()) {
2459
2460 const bool read_protected =
2461 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2462 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2463
2464 if (prot & PROT_READ) {
2465 rc = !read_protected;
2466 } else {
2467 rc = read_protected;
2468 }
2469
2470 if (!rc) {
2471 if (os::Aix::on_pase()) {
2472 // There is an issue on older PASE systems where mprotect() will return success but the
2473 // memory will not be protected.
2474 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2475 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2476 // a stack. It is an OS error.
2477 //
2478 // A valid strategy is just to try again. This usually works. :-/
2479
2480 ::usleep(1000);
2481 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+size), prot);
2482 if (::mprotect(addr, size, prot) == 0) {
2483 const bool read_protected_2 =
2484 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2485 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2486 rc = true;
2487 }
2488 }
2489 }
2490 }
2491 }
2492
2493 assert(rc == true, "mprotect failed.");
2494
2495 return rc;
2496 }
2497
2498 // Set protections specified
2499 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2500 unsigned int p = 0;
2501 switch (prot) {
2502 case MEM_PROT_NONE: p = PROT_NONE; break;
2503 case MEM_PROT_READ: p = PROT_READ; break;
2504 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2505 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2506 default:
2507 ShouldNotReachHere();
2508 }
2509 // is_committed is unused.
2510 return checked_mprotect(addr, size, p);
2511 }
2512
2513 bool os::guard_memory(char* addr, size_t size) {
2514 return checked_mprotect(addr, size, PROT_NONE);
2515 }
2516
2517 bool os::unguard_memory(char* addr, size_t size) {
2518 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2519 }
2520
2521 // Large page support
2522
2523 static size_t _large_page_size = 0;
2524
2525 // Enable large page support if OS allows that.
2526 void os::large_page_init() {
2527 return; // Nothing to do. See query_multipage_support and friends.
2528 }
2529
2530 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2531 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2532 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2533 // so this is not needed.
2534 assert(false, "should not be called on AIX");
2535 return NULL;
2536 }
2537
2538 bool os::release_memory_special(char* base, size_t bytes) {
2539 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2540 Unimplemented();
2541 return false;
2542 }
2543
2544 size_t os::large_page_size() {
2545 return _large_page_size;
2546 }
2547
2548 bool os::can_commit_large_page_memory() {
2549 // Does not matter, we do not support huge pages.
2550 return false;
2551 }
2552
2553 bool os::can_execute_large_page_memory() {
2554 // Does not matter, we do not support huge pages.
2555 return false;
2556 }
2557
2558 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2559 assert(file_desc >= 0, "file_desc is not valid");
2560 char* result = NULL;
2561
2562 // Always round to os::vm_page_size(), which may be larger than 4K.
2563 bytes = align_up(bytes, os::vm_page_size());
2564 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2565
2566 if (result != NULL) {
2567 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2568 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2569 }
2570 }
2571 return result;
2572 }
2573
2574 // Reserve memory at an arbitrary address, only if that area is
2575 // available (and not reserved for something else).
2576 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2577 char* addr = NULL;
2578
2579 // Always round to os::vm_page_size(), which may be larger than 4K.
2580 bytes = align_up(bytes, os::vm_page_size());
2581
2582 // In 4K mode always use mmap.
2583 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2584 if (os::vm_page_size() == 4*K) {
2585 return reserve_mmaped_memory(bytes, requested_addr, 0);
2586 } else {
2587 if (bytes >= Use64KPagesThreshold) {
2588 return reserve_shmated_memory(bytes, requested_addr, 0);
2589 } else {
2590 return reserve_mmaped_memory(bytes, requested_addr, 0);
2591 }
2592 }
2593
2594 return addr;
2595 }
2596
2597 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2598 void os::infinite_sleep() {
2599 while (true) { // sleep forever ...
2600 ::sleep(100); // ... 100 seconds at a time
2601 }
2602 }
2603
2604 // Used to convert frequent JVM_Yield() to nops
2605 bool os::dont_yield() {
2606 return DontYieldALot;
2607 }
2608
2609 void os::naked_yield() {
2610 sched_yield();
2611 }
2612
2613 ////////////////////////////////////////////////////////////////////////////////
2614 // thread priority support
2615
2616 // From AIX manpage to pthread_setschedparam
2617 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2618 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2619 //
2620 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2621 // range from 40 to 80, where 40 is the least favored priority and 80
2622 // is the most favored."
2623 //
2624 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2625 // scheduling there; however, this still leaves iSeries.)
2626 //
2627 // We use the same values for AIX and PASE.
2628 int os::java_to_os_priority[CriticalPriority + 1] = {
2629 54, // 0 Entry should never be used
2630
2631 55, // 1 MinPriority
2632 55, // 2
2633 56, // 3
2634
2635 56, // 4
2636 57, // 5 NormPriority
2637 57, // 6
2638
2639 58, // 7
2640 58, // 8
2641 59, // 9 NearMaxPriority
2642
2643 60, // 10 MaxPriority
2644
2645 60 // 11 CriticalPriority
2646 };
2647
2648 static int prio_init() {
2649 if (ThreadPriorityPolicy == 1) {
2650 if (geteuid() != 0) {
2651 if (!FLAG_IS_DEFAULT(ThreadPriorityPolicy)) {
2652 warning("-XX:ThreadPriorityPolicy=1 may require system level permission, " \
2653 "e.g., being the root user. If the necessary permission is not " \
2654 "possessed, changes to priority will be silently ignored.");
2655 }
2656 }
2657 }
2658 if (UseCriticalJavaThreadPriority) {
2659 os::java_to_os_priority[MaxPriority] = os::java_to_os_priority[CriticalPriority];
2660 }
2661 return 0;
2662 }
2663
2664 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2665 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) return OS_OK;
2666 pthread_t thr = thread->osthread()->pthread_id();
2667 int policy = SCHED_OTHER;
2668 struct sched_param param;
2669 param.sched_priority = newpri;
2670 int ret = pthread_setschedparam(thr, policy, ¶m);
2671
2672 if (ret != 0) {
2673 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2674 (int)thr, newpri, ret, os::errno_name(ret));
2675 }
2676 return (ret == 0) ? OS_OK : OS_ERR;
2677 }
2678
2679 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2680 if (!UseThreadPriorities || ThreadPriorityPolicy == 0) {
2681 *priority_ptr = java_to_os_priority[NormPriority];
2682 return OS_OK;
2683 }
2684 pthread_t thr = thread->osthread()->pthread_id();
2685 int policy = SCHED_OTHER;
2686 struct sched_param param;
2687 int ret = pthread_getschedparam(thr, &policy, ¶m);
2688 *priority_ptr = param.sched_priority;
2689
2690 return (ret == 0) ? OS_OK : OS_ERR;
2691 }
2692
2693 ////////////////////////////////////////////////////////////////////////////////
2694 // suspend/resume support
2695
2696 // The low-level signal-based suspend/resume support is a remnant from the
2697 // old VM-suspension that used to be for java-suspension, safepoints etc,
2698 // within hotspot. Currently used by JFR's OSThreadSampler
2699 //
2700 // The remaining code is greatly simplified from the more general suspension
2701 // code that used to be used.
2702 //
2703 // The protocol is quite simple:
2704 // - suspend:
2705 // - sends a signal to the target thread
2706 // - polls the suspend state of the osthread using a yield loop
2707 // - target thread signal handler (SR_handler) sets suspend state
2708 // and blocks in sigsuspend until continued
2709 // - resume:
2710 // - sets target osthread state to continue
2711 // - sends signal to end the sigsuspend loop in the SR_handler
2712 //
2713 // Note that the SR_lock plays no role in this suspend/resume protocol,
2714 // but is checked for NULL in SR_handler as a thread termination indicator.
2715 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2716 //
2717 // Note that resume_clear_context() and suspend_save_context() are needed
2718 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2719 // which in part is used by:
2720 // - Forte Analyzer: AsyncGetCallTrace()
2721 // - StackBanging: get_frame_at_stack_banging_point()
2722
2723 static void resume_clear_context(OSThread *osthread) {
2724 osthread->set_ucontext(NULL);
2725 osthread->set_siginfo(NULL);
2726 }
2727
2728 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2729 osthread->set_ucontext(context);
2730 osthread->set_siginfo(siginfo);
2731 }
2732
2733 //
2734 // Handler function invoked when a thread's execution is suspended or
2735 // resumed. We have to be careful that only async-safe functions are
2736 // called here (Note: most pthread functions are not async safe and
2737 // should be avoided.)
2738 //
2739 // Note: sigwait() is a more natural fit than sigsuspend() from an
2740 // interface point of view, but sigwait() prevents the signal hander
2741 // from being run. libpthread would get very confused by not having
2742 // its signal handlers run and prevents sigwait()'s use with the
2743 // mutex granting granting signal.
2744 //
2745 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2746 //
2747 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2748 // Save and restore errno to avoid confusing native code with EINTR
2749 // after sigsuspend.
2750 int old_errno = errno;
2751
2752 Thread* thread = Thread::current_or_null_safe();
2753 assert(thread != NULL, "Missing current thread in SR_handler");
2754
2755 // On some systems we have seen signal delivery get "stuck" until the signal
2756 // mask is changed as part of thread termination. Check that the current thread
2757 // has not already terminated (via SR_lock()) - else the following assertion
2758 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2759 // destructor has completed.
2760
2761 if (thread->SR_lock() == NULL) {
2762 return;
2763 }
2764
2765 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2766
2767 OSThread* osthread = thread->osthread();
2768
2769 os::SuspendResume::State current = osthread->sr.state();
2770 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2771 suspend_save_context(osthread, siginfo, context);
2772
2773 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2774 os::SuspendResume::State state = osthread->sr.suspended();
2775 if (state == os::SuspendResume::SR_SUSPENDED) {
2776 sigset_t suspend_set; // signals for sigsuspend()
2777 sigemptyset(&suspend_set);
2778 // get current set of blocked signals and unblock resume signal
2779 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2780 sigdelset(&suspend_set, SR_signum);
2781
2782 // wait here until we are resumed
2783 while (1) {
2784 sigsuspend(&suspend_set);
2785
2786 os::SuspendResume::State result = osthread->sr.running();
2787 if (result == os::SuspendResume::SR_RUNNING) {
2788 break;
2789 }
2790 }
2791
2792 } else if (state == os::SuspendResume::SR_RUNNING) {
2793 // request was cancelled, continue
2794 } else {
2795 ShouldNotReachHere();
2796 }
2797
2798 resume_clear_context(osthread);
2799 } else if (current == os::SuspendResume::SR_RUNNING) {
2800 // request was cancelled, continue
2801 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2802 // ignore
2803 } else {
2804 ShouldNotReachHere();
2805 }
2806
2807 errno = old_errno;
2808 }
2809
2810 static int SR_initialize() {
2811 struct sigaction act;
2812 char *s;
2813 // Get signal number to use for suspend/resume
2814 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2815 int sig = ::strtol(s, 0, 10);
2816 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2817 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2818 SR_signum = sig;
2819 } else {
2820 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2821 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2822 }
2823 }
2824
2825 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2826 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2827
2828 sigemptyset(&SR_sigset);
2829 sigaddset(&SR_sigset, SR_signum);
2830
2831 // Set up signal handler for suspend/resume.
2832 act.sa_flags = SA_RESTART|SA_SIGINFO;
2833 act.sa_handler = (void (*)(int)) SR_handler;
2834
2835 // SR_signum is blocked by default.
2836 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2837
2838 if (sigaction(SR_signum, &act, 0) == -1) {
2839 return -1;
2840 }
2841
2842 // Save signal flag
2843 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2844 return 0;
2845 }
2846
2847 static int SR_finalize() {
2848 return 0;
2849 }
2850
2851 static int sr_notify(OSThread* osthread) {
2852 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2853 assert_status(status == 0, status, "pthread_kill");
2854 return status;
2855 }
2856
2857 // "Randomly" selected value for how long we want to spin
2858 // before bailing out on suspending a thread, also how often
2859 // we send a signal to a thread we want to resume
2860 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2861 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2862
2863 // returns true on success and false on error - really an error is fatal
2864 // but this seems the normal response to library errors
2865 static bool do_suspend(OSThread* osthread) {
2866 assert(osthread->sr.is_running(), "thread should be running");
2867 // mark as suspended and send signal
2868
2869 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2870 // failed to switch, state wasn't running?
2871 ShouldNotReachHere();
2872 return false;
2873 }
2874
2875 if (sr_notify(osthread) != 0) {
2876 // try to cancel, switch to running
2877
2878 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2879 if (result == os::SuspendResume::SR_RUNNING) {
2880 // cancelled
2881 return false;
2882 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2883 // somehow managed to suspend
2884 return true;
2885 } else {
2886 ShouldNotReachHere();
2887 return false;
2888 }
2889 }
2890
2891 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2892
2893 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2894 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2895 os::naked_yield();
2896 }
2897
2898 // timeout, try to cancel the request
2899 if (n >= RANDOMLY_LARGE_INTEGER) {
2900 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2901 if (cancelled == os::SuspendResume::SR_RUNNING) {
2902 return false;
2903 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2904 return true;
2905 } else {
2906 ShouldNotReachHere();
2907 return false;
2908 }
2909 }
2910 }
2911
2912 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2913 return true;
2914 }
2915
2916 static void do_resume(OSThread* osthread) {
2917 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2918
2919 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2920 // failed to switch to WAKEUP_REQUEST
2921 ShouldNotReachHere();
2922 return;
2923 }
2924
2925 while (!osthread->sr.is_running()) {
2926 if (sr_notify(osthread) == 0) {
2927 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2928 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2929 os::naked_yield();
2930 }
2931 }
2932 } else {
2933 ShouldNotReachHere();
2934 }
2935 }
2936
2937 guarantee(osthread->sr.is_running(), "Must be running!");
2938 }
2939
2940 ///////////////////////////////////////////////////////////////////////////////////
2941 // signal handling (except suspend/resume)
2942
2943 // This routine may be used by user applications as a "hook" to catch signals.
2944 // The user-defined signal handler must pass unrecognized signals to this
2945 // routine, and if it returns true (non-zero), then the signal handler must
2946 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2947 // routine will never retun false (zero), but instead will execute a VM panic
2948 // routine kill the process.
2949 //
2950 // If this routine returns false, it is OK to call it again. This allows
2951 // the user-defined signal handler to perform checks either before or after
2952 // the VM performs its own checks. Naturally, the user code would be making
2953 // a serious error if it tried to handle an exception (such as a null check
2954 // or breakpoint) that the VM was generating for its own correct operation.
2955 //
2956 // This routine may recognize any of the following kinds of signals:
2957 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2958 // It should be consulted by handlers for any of those signals.
2959 //
2960 // The caller of this routine must pass in the three arguments supplied
2961 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2962 // field of the structure passed to sigaction(). This routine assumes that
2963 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2964 //
2965 // Note that the VM will print warnings if it detects conflicting signal
2966 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2967 //
2968 extern "C" JNIEXPORT int
2969 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2970
2971 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2972 // to be the thing to call; documentation is not terribly clear about whether
2973 // pthread_sigmask also works, and if it does, whether it does the same.
2974 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2975 const int rc = ::pthread_sigmask(how, set, oset);
2976 // return value semantics differ slightly for error case:
2977 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2978 // (so, pthread_sigmask is more theadsafe for error handling)
2979 // But success is always 0.
2980 return rc == 0 ? true : false;
2981 }
2982
2983 // Function to unblock all signals which are, according
2984 // to POSIX, typical program error signals. If they happen while being blocked,
2985 // they typically will bring down the process immediately.
2986 bool unblock_program_error_signals() {
2987 sigset_t set;
2988 ::sigemptyset(&set);
2989 ::sigaddset(&set, SIGILL);
2990 ::sigaddset(&set, SIGBUS);
2991 ::sigaddset(&set, SIGFPE);
2992 ::sigaddset(&set, SIGSEGV);
2993 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2994 }
2995
2996 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2997 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2998 assert(info != NULL && uc != NULL, "it must be old kernel");
2999
3000 // Never leave program error signals blocked;
3001 // on all our platforms they would bring down the process immediately when
3002 // getting raised while being blocked.
3003 unblock_program_error_signals();
3004
3005 int orig_errno = errno; // Preserve errno value over signal handler.
3006 JVM_handle_aix_signal(sig, info, uc, true);
3007 errno = orig_errno;
3008 }
3009
3010 // This boolean allows users to forward their own non-matching signals
3011 // to JVM_handle_aix_signal, harmlessly.
3012 bool os::Aix::signal_handlers_are_installed = false;
3013
3014 // For signal-chaining
3015 bool os::Aix::libjsig_is_loaded = false;
3016 typedef struct sigaction *(*get_signal_t)(int);
3017 get_signal_t os::Aix::get_signal_action = NULL;
3018
3019 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3020 struct sigaction *actp = NULL;
3021
3022 if (libjsig_is_loaded) {
3023 // Retrieve the old signal handler from libjsig
3024 actp = (*get_signal_action)(sig);
3025 }
3026 if (actp == NULL) {
3027 // Retrieve the preinstalled signal handler from jvm
3028 actp = os::Posix::get_preinstalled_handler(sig);
3029 }
3030
3031 return actp;
3032 }
3033
3034 static bool call_chained_handler(struct sigaction *actp, int sig,
3035 siginfo_t *siginfo, void *context) {
3036 // Call the old signal handler
3037 if (actp->sa_handler == SIG_DFL) {
3038 // It's more reasonable to let jvm treat it as an unexpected exception
3039 // instead of taking the default action.
3040 return false;
3041 } else if (actp->sa_handler != SIG_IGN) {
3042 if ((actp->sa_flags & SA_NODEFER) == 0) {
3043 // automaticlly block the signal
3044 sigaddset(&(actp->sa_mask), sig);
3045 }
3046
3047 sa_handler_t hand = NULL;
3048 sa_sigaction_t sa = NULL;
3049 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3050 // retrieve the chained handler
3051 if (siginfo_flag_set) {
3052 sa = actp->sa_sigaction;
3053 } else {
3054 hand = actp->sa_handler;
3055 }
3056
3057 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3058 actp->sa_handler = SIG_DFL;
3059 }
3060
3061 // try to honor the signal mask
3062 sigset_t oset;
3063 sigemptyset(&oset);
3064 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3065
3066 // call into the chained handler
3067 if (siginfo_flag_set) {
3068 (*sa)(sig, siginfo, context);
3069 } else {
3070 (*hand)(sig);
3071 }
3072
3073 // restore the signal mask
3074 pthread_sigmask(SIG_SETMASK, &oset, NULL);
3075 }
3076 // Tell jvm's signal handler the signal is taken care of.
3077 return true;
3078 }
3079
3080 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3081 bool chained = false;
3082 // signal-chaining
3083 if (UseSignalChaining) {
3084 struct sigaction *actp = get_chained_signal_action(sig);
3085 if (actp != NULL) {
3086 chained = call_chained_handler(actp, sig, siginfo, context);
3087 }
3088 }
3089 return chained;
3090 }
3091
3092 // for diagnostic
3093 int sigflags[NSIG];
3094
3095 int os::Aix::get_our_sigflags(int sig) {
3096 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3097 return sigflags[sig];
3098 }
3099
3100 void os::Aix::set_our_sigflags(int sig, int flags) {
3101 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3102 if (sig > 0 && sig < NSIG) {
3103 sigflags[sig] = flags;
3104 }
3105 }
3106
3107 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3108 // Check for overwrite.
3109 struct sigaction oldAct;
3110 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3111
3112 void* oldhand = oldAct.sa_sigaction
3113 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3114 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3115 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3116 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3117 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3118 if (AllowUserSignalHandlers || !set_installed) {
3119 // Do not overwrite; user takes responsibility to forward to us.
3120 return;
3121 } else if (UseSignalChaining) {
3122 // save the old handler in jvm
3123 os::Posix::save_preinstalled_handler(sig, oldAct);
3124 // libjsig also interposes the sigaction() call below and saves the
3125 // old sigaction on it own.
3126 } else {
3127 fatal("Encountered unexpected pre-existing sigaction handler "
3128 "%#lx for signal %d.", (long)oldhand, sig);
3129 }
3130 }
3131
3132 struct sigaction sigAct;
3133 sigfillset(&(sigAct.sa_mask));
3134 if (!set_installed) {
3135 sigAct.sa_handler = SIG_DFL;
3136 sigAct.sa_flags = SA_RESTART;
3137 } else {
3138 sigAct.sa_sigaction = javaSignalHandler;
3139 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3140 }
3141 // Save flags, which are set by ours
3142 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3143 sigflags[sig] = sigAct.sa_flags;
3144
3145 int ret = sigaction(sig, &sigAct, &oldAct);
3146 assert(ret == 0, "check");
3147
3148 void* oldhand2 = oldAct.sa_sigaction
3149 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3150 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3151 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3152 }
3153
3154 // install signal handlers for signals that HotSpot needs to
3155 // handle in order to support Java-level exception handling.
3156 void os::Aix::install_signal_handlers() {
3157 if (!signal_handlers_are_installed) {
3158 signal_handlers_are_installed = true;
3159
3160 // signal-chaining
3161 typedef void (*signal_setting_t)();
3162 signal_setting_t begin_signal_setting = NULL;
3163 signal_setting_t end_signal_setting = NULL;
3164 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3165 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3166 if (begin_signal_setting != NULL) {
3167 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3168 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3169 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3170 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3171 libjsig_is_loaded = true;
3172 assert(UseSignalChaining, "should enable signal-chaining");
3173 }
3174 if (libjsig_is_loaded) {
3175 // Tell libjsig jvm is setting signal handlers.
3176 (*begin_signal_setting)();
3177 }
3178
3179 set_signal_handler(SIGSEGV, true);
3180 set_signal_handler(SIGPIPE, true);
3181 set_signal_handler(SIGBUS, true);
3182 set_signal_handler(SIGILL, true);
3183 set_signal_handler(SIGFPE, true);
3184 set_signal_handler(SIGTRAP, true);
3185 set_signal_handler(SIGXFSZ, true);
3186
3187 if (libjsig_is_loaded) {
3188 // Tell libjsig jvm finishes setting signal handlers.
3189 (*end_signal_setting)();
3190 }
3191
3192 // We don't activate signal checker if libjsig is in place, we trust ourselves
3193 // and if UserSignalHandler is installed all bets are off.
3194 // Log that signal checking is off only if -verbose:jni is specified.
3195 if (CheckJNICalls) {
3196 if (libjsig_is_loaded) {
3197 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3198 check_signals = false;
3199 }
3200 if (AllowUserSignalHandlers) {
3201 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3202 check_signals = false;
3203 }
3204 // Need to initialize check_signal_done.
3205 ::sigemptyset(&check_signal_done);
3206 }
3207 }
3208 }
3209
3210 static const char* get_signal_handler_name(address handler,
3211 char* buf, int buflen) {
3212 int offset;
3213 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3214 if (found) {
3215 // skip directory names
3216 const char *p1, *p2;
3217 p1 = buf;
3218 size_t len = strlen(os::file_separator());
3219 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3220 // The way os::dll_address_to_library_name is implemented on Aix
3221 // right now, it always returns -1 for the offset which is not
3222 // terribly informative.
3223 // Will fix that. For now, omit the offset.
3224 jio_snprintf(buf, buflen, "%s", p1);
3225 } else {
3226 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3227 }
3228 return buf;
3229 }
3230
3231 static void print_signal_handler(outputStream* st, int sig,
3232 char* buf, size_t buflen) {
3233 struct sigaction sa;
3234 sigaction(sig, NULL, &sa);
3235
3236 st->print("%s: ", os::exception_name(sig, buf, buflen));
3237
3238 address handler = (sa.sa_flags & SA_SIGINFO)
3239 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3240 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3241
3242 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3243 st->print("SIG_DFL");
3244 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3245 st->print("SIG_IGN");
3246 } else {
3247 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3248 }
3249
3250 // Print readable mask.
3251 st->print(", sa_mask[0]=");
3252 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3253
3254 address rh = VMError::get_resetted_sighandler(sig);
3255 // May be, handler was resetted by VMError?
3256 if (rh != NULL) {
3257 handler = rh;
3258 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3259 }
3260
3261 // Print textual representation of sa_flags.
3262 st->print(", sa_flags=");
3263 os::Posix::print_sa_flags(st, sa.sa_flags);
3264
3265 // Check: is it our handler?
3266 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3267 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3268 // It is our signal handler.
3269 // Check for flags, reset system-used one!
3270 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3271 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3272 os::Aix::get_our_sigflags(sig));
3273 }
3274 }
3275 st->cr();
3276 }
3277
3278 #define DO_SIGNAL_CHECK(sig) \
3279 if (!sigismember(&check_signal_done, sig)) \
3280 os::Aix::check_signal_handler(sig)
3281
3282 // This method is a periodic task to check for misbehaving JNI applications
3283 // under CheckJNI, we can add any periodic checks here
3284
3285 void os::run_periodic_checks() {
3286
3287 if (check_signals == false) return;
3288
3289 // SEGV and BUS if overridden could potentially prevent
3290 // generation of hs*.log in the event of a crash, debugging
3291 // such a case can be very challenging, so we absolutely
3292 // check the following for a good measure:
3293 DO_SIGNAL_CHECK(SIGSEGV);
3294 DO_SIGNAL_CHECK(SIGILL);
3295 DO_SIGNAL_CHECK(SIGFPE);
3296 DO_SIGNAL_CHECK(SIGBUS);
3297 DO_SIGNAL_CHECK(SIGPIPE);
3298 DO_SIGNAL_CHECK(SIGXFSZ);
3299 if (UseSIGTRAP) {
3300 DO_SIGNAL_CHECK(SIGTRAP);
3301 }
3302
3303 // ReduceSignalUsage allows the user to override these handlers
3304 // see comments at the very top and jvm_md.h
3305 if (!ReduceSignalUsage) {
3306 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3307 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3308 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3309 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3310 }
3311
3312 DO_SIGNAL_CHECK(SR_signum);
3313 }
3314
3315 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3316
3317 static os_sigaction_t os_sigaction = NULL;
3318
3319 void os::Aix::check_signal_handler(int sig) {
3320 char buf[O_BUFLEN];
3321 address jvmHandler = NULL;
3322
3323 struct sigaction act;
3324 if (os_sigaction == NULL) {
3325 // only trust the default sigaction, in case it has been interposed
3326 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3327 if (os_sigaction == NULL) return;
3328 }
3329
3330 os_sigaction(sig, (struct sigaction*)NULL, &act);
3331
3332 address thisHandler = (act.sa_flags & SA_SIGINFO)
3333 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3334 : CAST_FROM_FN_PTR(address, act.sa_handler);
3335
3336 switch(sig) {
3337 case SIGSEGV:
3338 case SIGBUS:
3339 case SIGFPE:
3340 case SIGPIPE:
3341 case SIGILL:
3342 case SIGXFSZ:
3343 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3344 break;
3345
3346 case SHUTDOWN1_SIGNAL:
3347 case SHUTDOWN2_SIGNAL:
3348 case SHUTDOWN3_SIGNAL:
3349 case BREAK_SIGNAL:
3350 jvmHandler = (address)user_handler();
3351 break;
3352
3353 default:
3354 if (sig == SR_signum) {
3355 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3356 } else {
3357 return;
3358 }
3359 break;
3360 }
3361
3362 if (thisHandler != jvmHandler) {
3363 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3364 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3365 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3366 // No need to check this sig any longer
3367 sigaddset(&check_signal_done, sig);
3368 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3369 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3370 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3371 exception_name(sig, buf, O_BUFLEN));
3372 }
3373 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3374 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3375 tty->print("expected:");
3376 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3377 tty->cr();
3378 tty->print(" found:");
3379 os::Posix::print_sa_flags(tty, act.sa_flags);
3380 tty->cr();
3381 // No need to check this sig any longer
3382 sigaddset(&check_signal_done, sig);
3383 }
3384
3385 // Dump all the signal
3386 if (sigismember(&check_signal_done, sig)) {
3387 print_signal_handlers(tty, buf, O_BUFLEN);
3388 }
3389 }
3390
3391 // To install functions for atexit system call
3392 extern "C" {
3393 static void perfMemory_exit_helper() {
3394 perfMemory_exit();
3395 }
3396 }
3397
3398 // This is called _before_ the most of global arguments have been parsed.
3399 void os::init(void) {
3400 // This is basic, we want to know if that ever changes.
3401 // (Shared memory boundary is supposed to be a 256M aligned.)
3402 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3403
3404 // Record process break at startup.
3405 g_brk_at_startup = (address) ::sbrk(0);
3406 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3407
3408 // First off, we need to know whether we run on AIX or PASE, and
3409 // the OS level we run on.
3410 os::Aix::initialize_os_info();
3411
3412 // Scan environment (SPEC1170 behaviour, etc).
3413 os::Aix::scan_environment();
3414
3415 // Probe multipage support.
3416 query_multipage_support();
3417
3418 // Act like we only have one page size by eliminating corner cases which
3419 // we did not support very well anyway.
3420 // We have two input conditions:
3421 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3422 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3423 // setting.
3424 // Data segment page size is important for us because it defines the thread stack page
3425 // size, which is needed for guard page handling, stack banging etc.
3426 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3427 // and should be allocated with 64k pages.
3428 //
3429 // So, we do the following:
3430 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3431 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3432 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3433 // 64k no --- AIX 5.2 ? ---
3434 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3435
3436 // We explicitly leave no option to change page size, because only upgrading would work,
3437 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3438
3439 if (g_multipage_support.datapsize == 4*K) {
3440 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3441 if (g_multipage_support.can_use_64K_pages) {
3442 // .. but we are able to use 64K pages dynamically.
3443 // This would be typical for java launchers which are not linked
3444 // with datapsize=64K (like, any other launcher but our own).
3445 //
3446 // In this case it would be smart to allocate the java heap with 64K
3447 // to get the performance benefit, and to fake 64k pages for the
3448 // data segment (when dealing with thread stacks).
3449 //
3450 // However, leave a possibility to downgrade to 4K, using
3451 // -XX:-Use64KPages.
3452 if (Use64KPages) {
3453 trcVerbose("64K page mode (faked for data segment)");
3454 Aix::_page_size = 64*K;
3455 } else {
3456 trcVerbose("4K page mode (Use64KPages=off)");
3457 Aix::_page_size = 4*K;
3458 }
3459 } else {
3460 // .. and not able to allocate 64k pages dynamically. Here, just
3461 // fall back to 4K paged mode and use mmap for everything.
3462 trcVerbose("4K page mode");
3463 Aix::_page_size = 4*K;
3464 FLAG_SET_ERGO(Use64KPages, false);
3465 }
3466 } else {
3467 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3468 // This normally means that we can allocate 64k pages dynamically.
3469 // (There is one special case where this may be false: EXTSHM=on.
3470 // but we decided to not support that mode).
3471 assert0(g_multipage_support.can_use_64K_pages);
3472 Aix::_page_size = 64*K;
3473 trcVerbose("64K page mode");
3474 FLAG_SET_ERGO(Use64KPages, true);
3475 }
3476
3477 // For now UseLargePages is just ignored.
3478 FLAG_SET_ERGO(UseLargePages, false);
3479 _page_sizes[0] = 0;
3480
3481 // debug trace
3482 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3483
3484 // Next, we need to initialize libo4 and libperfstat libraries.
3485 if (os::Aix::on_pase()) {
3486 os::Aix::initialize_libo4();
3487 } else {
3488 os::Aix::initialize_libperfstat();
3489 }
3490
3491 // Reset the perfstat information provided by ODM.
3492 if (os::Aix::on_aix()) {
3493 libperfstat::perfstat_reset();
3494 }
3495
3496 // Now initialze basic system properties. Note that for some of the values we
3497 // need libperfstat etc.
3498 os::Aix::initialize_system_info();
3499
3500 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3501
3502 init_random(1234567);
3503
3504 // _main_thread points to the thread that created/loaded the JVM.
3505 Aix::_main_thread = pthread_self();
3506
3507 initial_time_count = javaTimeNanos();
3508
3509 os::Posix::init();
3510 }
3511
3512 // This is called _after_ the global arguments have been parsed.
3513 jint os::init_2(void) {
3514
3515 // This could be set after os::Posix::init() but all platforms
3516 // have to set it the same so we have to mirror Solaris.
3517 DEBUG_ONLY(os::set_mutex_init_done();)
3518
3519 os::Posix::init_2();
3520
3521 if (os::Aix::on_pase()) {
3522 trcVerbose("Running on PASE.");
3523 } else {
3524 trcVerbose("Running on AIX (not PASE).");
3525 }
3526
3527 trcVerbose("processor count: %d", os::_processor_count);
3528 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3529
3530 // Initially build up the loaded dll map.
3531 LoadedLibraries::reload();
3532 if (Verbose) {
3533 trcVerbose("Loaded Libraries: ");
3534 LoadedLibraries::print(tty);
3535 }
3536
3537 // initialize suspend/resume support - must do this before signal_sets_init()
3538 if (SR_initialize() != 0) {
3539 perror("SR_initialize failed");
3540 return JNI_ERR;
3541 }
3542
3543 Aix::signal_sets_init();
3544 Aix::install_signal_handlers();
3545 // Initialize data for jdk.internal.misc.Signal
3546 if (!ReduceSignalUsage) {
3547 jdk_misc_signal_init();
3548 }
3549
3550 // Check and sets minimum stack sizes against command line options
3551 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3552 return JNI_ERR;
3553 }
3554
3555 if (UseNUMA) {
3556 UseNUMA = false;
3557 warning("NUMA optimizations are not available on this OS.");
3558 }
3559
3560 if (MaxFDLimit) {
3561 // Set the number of file descriptors to max. print out error
3562 // if getrlimit/setrlimit fails but continue regardless.
3563 struct rlimit nbr_files;
3564 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3565 if (status != 0) {
3566 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3567 } else {
3568 nbr_files.rlim_cur = nbr_files.rlim_max;
3569 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3570 if (status != 0) {
3571 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3572 }
3573 }
3574 }
3575
3576 if (PerfAllowAtExitRegistration) {
3577 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3578 // At exit functions can be delayed until process exit time, which
3579 // can be problematic for embedded VM situations. Embedded VMs should
3580 // call DestroyJavaVM() to assure that VM resources are released.
3581
3582 // Note: perfMemory_exit_helper atexit function may be removed in
3583 // the future if the appropriate cleanup code can be added to the
3584 // VM_Exit VMOperation's doit method.
3585 if (atexit(perfMemory_exit_helper) != 0) {
3586 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3587 }
3588 }
3589
3590 // initialize thread priority policy
3591 prio_init();
3592
3593 return JNI_OK;
3594 }
3595
3596 // Mark the polling page as unreadable
3597 void os::make_polling_page_unreadable(void) {
3598 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3599 fatal("Could not disable polling page");
3600 }
3601 };
3602
3603 // Mark the polling page as readable
3604 void os::make_polling_page_readable(void) {
3605 // Changed according to os_linux.cpp.
3606 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3607 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3608 }
3609 };
3610
3611 int os::active_processor_count() {
3612 // User has overridden the number of active processors
3613 if (ActiveProcessorCount > 0) {
3614 log_trace(os)("active_processor_count: "
3615 "active processor count set by user : %d",
3616 ActiveProcessorCount);
3617 return ActiveProcessorCount;
3618 }
3619
3620 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3621 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3622 return online_cpus;
3623 }
3624
3625 void os::set_native_thread_name(const char *name) {
3626 // Not yet implemented.
3627 return;
3628 }
3629
3630 bool os::bind_to_processor(uint processor_id) {
3631 // Not yet implemented.
3632 return false;
3633 }
3634
3635 void os::SuspendedThreadTask::internal_do_task() {
3636 if (do_suspend(_thread->osthread())) {
3637 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3638 do_task(context);
3639 do_resume(_thread->osthread());
3640 }
3641 }
3642
3643 ////////////////////////////////////////////////////////////////////////////////
3644 // debug support
3645
3646 bool os::find(address addr, outputStream* st) {
3647
3648 st->print(PTR_FORMAT ": ", addr);
3649
3650 loaded_module_t lm;
3651 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3652 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3653 st->print_cr("%s", lm.path);
3654 return true;
3655 }
3656
3657 return false;
3658 }
3659
3660 ////////////////////////////////////////////////////////////////////////////////
3661 // misc
3662
3663 // This does not do anything on Aix. This is basically a hook for being
3664 // able to use structured exception handling (thread-local exception filters)
3665 // on, e.g., Win32.
3666 void
3667 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3668 JavaCallArguments* args, Thread* thread) {
3669 f(value, method, args, thread);
3670 }
3671
3672 void os::print_statistics() {
3673 }
3674
3675 bool os::message_box(const char* title, const char* message) {
3676 int i;
3677 fdStream err(defaultStream::error_fd());
3678 for (i = 0; i < 78; i++) err.print_raw("=");
3679 err.cr();
3680 err.print_raw_cr(title);
3681 for (i = 0; i < 78; i++) err.print_raw("-");
3682 err.cr();
3683 err.print_raw_cr(message);
3684 for (i = 0; i < 78; i++) err.print_raw("=");
3685 err.cr();
3686
3687 char buf[16];
3688 // Prevent process from exiting upon "read error" without consuming all CPU
3689 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3690
3691 return buf[0] == 'y' || buf[0] == 'Y';
3692 }
3693
3694 // Is a (classpath) directory empty?
3695 bool os::dir_is_empty(const char* path) {
3696 DIR *dir = NULL;
3697 struct dirent *ptr;
3698
3699 dir = opendir(path);
3700 if (dir == NULL) return true;
3701
3702 /* Scan the directory */
3703 bool result = true;
3704 while (result && (ptr = readdir(dir)) != NULL) {
3705 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3706 result = false;
3707 }
3708 }
3709 closedir(dir);
3710 return result;
3711 }
3712
3713 // This code originates from JDK's sysOpen and open64_w
3714 // from src/solaris/hpi/src/system_md.c
3715
3716 int os::open(const char *path, int oflag, int mode) {
3717
3718 if (strlen(path) > MAX_PATH - 1) {
3719 errno = ENAMETOOLONG;
3720 return -1;
3721 }
3722 int fd;
3723
3724 fd = ::open64(path, oflag, mode);
3725 if (fd == -1) return -1;
3726
3727 // If the open succeeded, the file might still be a directory.
3728 {
3729 struct stat64 buf64;
3730 int ret = ::fstat64(fd, &buf64);
3731 int st_mode = buf64.st_mode;
3732
3733 if (ret != -1) {
3734 if ((st_mode & S_IFMT) == S_IFDIR) {
3735 errno = EISDIR;
3736 ::close(fd);
3737 return -1;
3738 }
3739 } else {
3740 ::close(fd);
3741 return -1;
3742 }
3743 }
3744
3745 // All file descriptors that are opened in the JVM and not
3746 // specifically destined for a subprocess should have the
3747 // close-on-exec flag set. If we don't set it, then careless 3rd
3748 // party native code might fork and exec without closing all
3749 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3750 // UNIXProcess.c), and this in turn might:
3751 //
3752 // - cause end-of-file to fail to be detected on some file
3753 // descriptors, resulting in mysterious hangs, or
3754 //
3755 // - might cause an fopen in the subprocess to fail on a system
3756 // suffering from bug 1085341.
3757 //
3758 // (Yes, the default setting of the close-on-exec flag is a Unix
3759 // design flaw.)
3760 //
3761 // See:
3762 // 1085341: 32-bit stdio routines should support file descriptors >255
3763 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3764 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3765 #ifdef FD_CLOEXEC
3766 {
3767 int flags = ::fcntl(fd, F_GETFD);
3768 if (flags != -1)
3769 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3770 }
3771 #endif
3772
3773 return fd;
3774 }
3775
3776 // create binary file, rewriting existing file if required
3777 int os::create_binary_file(const char* path, bool rewrite_existing) {
3778 int oflags = O_WRONLY | O_CREAT;
3779 if (!rewrite_existing) {
3780 oflags |= O_EXCL;
3781 }
3782 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3783 }
3784
3785 // return current position of file pointer
3786 jlong os::current_file_offset(int fd) {
3787 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3788 }
3789
3790 // move file pointer to the specified offset
3791 jlong os::seek_to_file_offset(int fd, jlong offset) {
3792 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3793 }
3794
3795 // This code originates from JDK's sysAvailable
3796 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3797
3798 int os::available(int fd, jlong *bytes) {
3799 jlong cur, end;
3800 int mode;
3801 struct stat64 buf64;
3802
3803 if (::fstat64(fd, &buf64) >= 0) {
3804 mode = buf64.st_mode;
3805 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3806 int n;
3807 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3808 *bytes = n;
3809 return 1;
3810 }
3811 }
3812 }
3813 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3814 return 0;
3815 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3816 return 0;
3817 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3818 return 0;
3819 }
3820 *bytes = end - cur;
3821 return 1;
3822 }
3823
3824 // Map a block of memory.
3825 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3826 char *addr, size_t bytes, bool read_only,
3827 bool allow_exec) {
3828 int prot;
3829 int flags = MAP_PRIVATE;
3830
3831 if (read_only) {
3832 prot = PROT_READ;
3833 flags = MAP_SHARED;
3834 } else {
3835 prot = PROT_READ | PROT_WRITE;
3836 flags = MAP_PRIVATE;
3837 }
3838
3839 if (allow_exec) {
3840 prot |= PROT_EXEC;
3841 }
3842
3843 if (addr != NULL) {
3844 flags |= MAP_FIXED;
3845 }
3846
3847 // Allow anonymous mappings if 'fd' is -1.
3848 if (fd == -1) {
3849 flags |= MAP_ANONYMOUS;
3850 }
3851
3852 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3853 fd, file_offset);
3854 if (mapped_address == MAP_FAILED) {
3855 return NULL;
3856 }
3857 return mapped_address;
3858 }
3859
3860 // Remap a block of memory.
3861 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3862 char *addr, size_t bytes, bool read_only,
3863 bool allow_exec) {
3864 // same as map_memory() on this OS
3865 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3866 allow_exec);
3867 }
3868
3869 // Unmap a block of memory.
3870 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3871 return munmap(addr, bytes) == 0;
3872 }
3873
3874 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3875 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3876 // of a thread.
3877 //
3878 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3879 // the fast estimate available on the platform.
3880
3881 jlong os::current_thread_cpu_time() {
3882 // return user + sys since the cost is the same
3883 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3884 assert(n >= 0, "negative CPU time");
3885 return n;
3886 }
3887
3888 jlong os::thread_cpu_time(Thread* thread) {
3889 // consistent with what current_thread_cpu_time() returns
3890 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3891 assert(n >= 0, "negative CPU time");
3892 return n;
3893 }
3894
3895 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3896 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3897 assert(n >= 0, "negative CPU time");
3898 return n;
3899 }
3900
3901 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3902 bool error = false;
3903
3904 jlong sys_time = 0;
3905 jlong user_time = 0;
3906
3907 // Reimplemented using getthrds64().
3908 //
3909 // Works like this:
3910 // For the thread in question, get the kernel thread id. Then get the
3911 // kernel thread statistics using that id.
3912 //
3913 // This only works of course when no pthread scheduling is used,
3914 // i.e. there is a 1:1 relationship to kernel threads.
3915 // On AIX, see AIXTHREAD_SCOPE variable.
3916
3917 pthread_t pthtid = thread->osthread()->pthread_id();
3918
3919 // retrieve kernel thread id for the pthread:
3920 tid64_t tid = 0;
3921 struct __pthrdsinfo pinfo;
3922 // I just love those otherworldly IBM APIs which force me to hand down
3923 // dummy buffers for stuff I dont care for...
3924 char dummy[1];
3925 int dummy_size = sizeof(dummy);
3926 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3927 dummy, &dummy_size) == 0) {
3928 tid = pinfo.__pi_tid;
3929 } else {
3930 tty->print_cr("pthread_getthrds_np failed.");
3931 error = true;
3932 }
3933
3934 // retrieve kernel timing info for that kernel thread
3935 if (!error) {
3936 struct thrdentry64 thrdentry;
3937 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3938 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3939 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3940 } else {
3941 tty->print_cr("pthread_getthrds_np failed.");
3942 error = true;
3943 }
3944 }
3945
3946 if (p_sys_time) {
3947 *p_sys_time = sys_time;
3948 }
3949
3950 if (p_user_time) {
3951 *p_user_time = user_time;
3952 }
3953
3954 if (error) {
3955 return false;
3956 }
3957
3958 return true;
3959 }
3960
3961 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3962 jlong sys_time;
3963 jlong user_time;
3964
3965 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3966 return -1;
3967 }
3968
3969 return user_sys_cpu_time ? sys_time + user_time : user_time;
3970 }
3971
3972 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3973 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3974 info_ptr->may_skip_backward = false; // elapsed time not wall time
3975 info_ptr->may_skip_forward = false; // elapsed time not wall time
3976 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3977 }
3978
3979 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3980 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3981 info_ptr->may_skip_backward = false; // elapsed time not wall time
3982 info_ptr->may_skip_forward = false; // elapsed time not wall time
3983 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3984 }
3985
3986 bool os::is_thread_cpu_time_supported() {
3987 return true;
3988 }
3989
3990 // System loadavg support. Returns -1 if load average cannot be obtained.
3991 // For now just return the system wide load average (no processor sets).
3992 int os::loadavg(double values[], int nelem) {
3993
3994 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3995 guarantee(values, "argument error");
3996
3997 if (os::Aix::on_pase()) {
3998
3999 // AS/400 PASE: use libo4 porting library
4000 double v[3] = { 0.0, 0.0, 0.0 };
4001
4002 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4003 for (int i = 0; i < nelem; i ++) {
4004 values[i] = v[i];
4005 }
4006 return nelem;
4007 } else {
4008 return -1;
4009 }
4010
4011 } else {
4012
4013 // AIX: use libperfstat
4014 libperfstat::cpuinfo_t ci;
4015 if (libperfstat::get_cpuinfo(&ci)) {
4016 for (int i = 0; i < nelem; i++) {
4017 values[i] = ci.loadavg[i];
4018 }
4019 } else {
4020 return -1;
4021 }
4022 return nelem;
4023 }
4024 }
4025
4026 void os::pause() {
4027 char filename[MAX_PATH];
4028 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4029 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile);
4030 } else {
4031 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4032 }
4033
4034 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4035 if (fd != -1) {
4036 struct stat buf;
4037 ::close(fd);
4038 while (::stat(filename, &buf) == 0) {
4039 (void)::poll(NULL, 0, 100);
4040 }
4041 } else {
4042 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4043 }
4044 }
4045
4046 bool os::is_primordial_thread(void) {
4047 if (pthread_self() == (pthread_t)1) {
4048 return true;
4049 } else {
4050 return false;
4051 }
4052 }
4053
4054 // OS recognitions (PASE/AIX, OS level) call this before calling any
4055 // one of Aix::on_pase(), Aix::os_version() static
4056 void os::Aix::initialize_os_info() {
4057
4058 assert(_on_pase == -1 && _os_version == 0, "already called.");
4059
4060 struct utsname uts;
4061 memset(&uts, 0, sizeof(uts));
4062 strcpy(uts.sysname, "?");
4063 if (::uname(&uts) == -1) {
4064 trcVerbose("uname failed (%d)", errno);
4065 guarantee(0, "Could not determine whether we run on AIX or PASE");
4066 } else {
4067 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4068 "node \"%s\" machine \"%s\"\n",
4069 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4070 const int major = atoi(uts.version);
4071 assert(major > 0, "invalid OS version");
4072 const int minor = atoi(uts.release);
4073 assert(minor > 0, "invalid OS release");
4074 _os_version = (major << 24) | (minor << 16);
4075 char ver_str[20] = {0};
4076 const char* name_str = "unknown OS";
4077 if (strcmp(uts.sysname, "OS400") == 0) {
4078 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4079 _on_pase = 1;
4080 if (os_version_short() < 0x0504) {
4081 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4082 assert(false, "OS/400 release too old.");
4083 }
4084 name_str = "OS/400 (pase)";
4085 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4086 } else if (strcmp(uts.sysname, "AIX") == 0) {
4087 // We run on AIX. We do not support versions older than AIX 7.1.
4088 _on_pase = 0;
4089 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4090 odmWrapper::determine_os_kernel_version(&_os_version);
4091 if (os_version_short() < 0x0701) {
4092 trcVerbose("AIX releases older than AIX 7.1 are not supported.");
4093 assert(false, "AIX release too old.");
4094 }
4095 name_str = "AIX";
4096 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4097 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4098 } else {
4099 assert(false, "%s", name_str);
4100 }
4101 trcVerbose("We run on %s %s", name_str, ver_str);
4102 }
4103
4104 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4105 } // end: os::Aix::initialize_os_info()
4106
4107 // Scan environment for important settings which might effect the VM.
4108 // Trace out settings. Warn about invalid settings and/or correct them.
4109 //
4110 // Must run after os::Aix::initialue_os_info().
4111 void os::Aix::scan_environment() {
4112
4113 char* p;
4114 int rc;
4115
4116 // Warn explicity if EXTSHM=ON is used. That switch changes how
4117 // System V shared memory behaves. One effect is that page size of
4118 // shared memory cannot be change dynamically, effectivly preventing
4119 // large pages from working.
4120 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4121 // recommendation is (in OSS notes) to switch it off.
4122 p = ::getenv("EXTSHM");
4123 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4124 if (p && strcasecmp(p, "ON") == 0) {
4125 _extshm = 1;
4126 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4127 if (!AllowExtshm) {
4128 // We allow under certain conditions the user to continue. However, we want this
4129 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4130 // that the VM is not able to allocate 64k pages for the heap.
4131 // We do not want to run with reduced performance.
4132 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4133 }
4134 } else {
4135 _extshm = 0;
4136 }
4137
4138 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4139 // Not tested, not supported.
4140 //
4141 // Note that it might be worth the trouble to test and to require it, if only to
4142 // get useful return codes for mprotect.
4143 //
4144 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4145 // exec() ? before loading the libjvm ? ....)
4146 p = ::getenv("XPG_SUS_ENV");
4147 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4148 if (p && strcmp(p, "ON") == 0) {
4149 _xpg_sus_mode = 1;
4150 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4151 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4152 // clobber address ranges. If we ever want to support that, we have to do some
4153 // testing first.
4154 guarantee(false, "XPG_SUS_ENV=ON not supported");
4155 } else {
4156 _xpg_sus_mode = 0;
4157 }
4158
4159 if (os::Aix::on_pase()) {
4160 p = ::getenv("QIBM_MULTI_THREADED");
4161 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4162 }
4163
4164 p = ::getenv("LDR_CNTRL");
4165 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4166 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4167 if (p && ::strstr(p, "TEXTPSIZE")) {
4168 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4169 "you may experience hangs or crashes on OS/400 V7R1.");
4170 }
4171 }
4172
4173 p = ::getenv("AIXTHREAD_GUARDPAGES");
4174 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4175
4176 } // end: os::Aix::scan_environment()
4177
4178 // PASE: initialize the libo4 library (PASE porting library).
4179 void os::Aix::initialize_libo4() {
4180 guarantee(os::Aix::on_pase(), "OS/400 only.");
4181 if (!libo4::init()) {
4182 trcVerbose("libo4 initialization failed.");
4183 assert(false, "libo4 initialization failed");
4184 } else {
4185 trcVerbose("libo4 initialized.");
4186 }
4187 }
4188
4189 // AIX: initialize the libperfstat library.
4190 void os::Aix::initialize_libperfstat() {
4191 assert(os::Aix::on_aix(), "AIX only");
4192 if (!libperfstat::init()) {
4193 trcVerbose("libperfstat initialization failed.");
4194 assert(false, "libperfstat initialization failed");
4195 } else {
4196 trcVerbose("libperfstat initialized.");
4197 }
4198 }
4199
4200 /////////////////////////////////////////////////////////////////////////////
4201 // thread stack
4202
4203 // Get the current stack base from the OS (actually, the pthread library).
4204 // Note: usually not page aligned.
4205 address os::current_stack_base() {
4206 AixMisc::stackbounds_t bounds;
4207 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4208 guarantee(rc, "Unable to retrieve stack bounds.");
4209 return bounds.base;
4210 }
4211
4212 // Get the current stack size from the OS (actually, the pthread library).
4213 // Returned size is such that (base - size) is always aligned to page size.
4214 size_t os::current_stack_size() {
4215 AixMisc::stackbounds_t bounds;
4216 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4217 guarantee(rc, "Unable to retrieve stack bounds.");
4218 // Align the returned stack size such that the stack low address
4219 // is aligned to page size (Note: base is usually not and we do not care).
4220 // We need to do this because caller code will assume stack low address is
4221 // page aligned and will place guard pages without checking.
4222 address low = bounds.base - bounds.size;
4223 address low_aligned = (address)align_up(low, os::vm_page_size());
4224 size_t s = bounds.base - low_aligned;
4225 return s;
4226 }
4227
4228 extern char** environ;
4229
4230 // Run the specified command in a separate process. Return its exit value,
4231 // or -1 on failure (e.g. can't fork a new process).
4232 // Unlike system(), this function can be called from signal handler. It
4233 // doesn't block SIGINT et al.
4234 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) {
4235 char* argv[4] = { (char*)"sh", (char*)"-c", cmd, NULL};
4236
4237 pid_t pid = fork();
4238
4239 if (pid < 0) {
4240 // fork failed
4241 return -1;
4242
4243 } else if (pid == 0) {
4244 // child process
4245
4246 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4247 execve("/usr/bin/sh", argv, environ);
4248
4249 // execve failed
4250 _exit(-1);
4251
4252 } else {
4253 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4254 // care about the actual exit code, for now.
4255
4256 int status;
4257
4258 // Wait for the child process to exit. This returns immediately if
4259 // the child has already exited. */
4260 while (waitpid(pid, &status, 0) < 0) {
4261 switch (errno) {
4262 case ECHILD: return 0;
4263 case EINTR: break;
4264 default: return -1;
4265 }
4266 }
4267
4268 if (WIFEXITED(status)) {
4269 // The child exited normally; get its exit code.
4270 return WEXITSTATUS(status);
4271 } else if (WIFSIGNALED(status)) {
4272 // The child exited because of a signal.
4273 // The best value to return is 0x80 + signal number,
4274 // because that is what all Unix shells do, and because
4275 // it allows callers to distinguish between process exit and
4276 // process death by signal.
4277 return 0x80 + WTERMSIG(status);
4278 } else {
4279 // Unknown exit code; pass it through.
4280 return status;
4281 }
4282 }
4283 return -1;
4284 }
4285
4286 // Get the default path to the core file
4287 // Returns the length of the string
4288 int os::get_core_path(char* buffer, size_t bufferSize) {
4289 const char* p = get_current_directory(buffer, bufferSize);
4290
4291 if (p == NULL) {
4292 assert(p != NULL, "failed to get current directory");
4293 return 0;
4294 }
4295
4296 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4297 p, current_process_id());
4298
4299 return strlen(buffer);
4300 }
4301
4302 #ifndef PRODUCT
4303 void TestReserveMemorySpecial_test() {
4304 // No tests available for this platform
4305 }
4306 #endif
4307
4308 bool os::start_debugging(char *buf, int buflen) {
4309 int len = (int)strlen(buf);
4310 char *p = &buf[len];
4311
4312 jio_snprintf(p, buflen -len,
4313 "\n\n"
4314 "Do you want to debug the problem?\n\n"
4315 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4316 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4317 "Otherwise, press RETURN to abort...",
4318 os::current_process_id(),
4319 os::current_thread_id(), thread_self());
4320
4321 bool yes = os::message_box("Unexpected Error", buf);
4322
4323 if (yes) {
4324 // yes, user asked VM to launch debugger
4325 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4326
4327 os::fork_and_exec(buf);
4328 yes = false;
4329 }
4330 return yes;
4331 }
4332
4333 static inline time_t get_mtime(const char* filename) {
4334 struct stat st;
4335 int ret = os::stat(filename, &st);
4336 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno));
4337 return st.st_mtime;
4338 }
4339
4340 int os::compare_file_modified_times(const char* file1, const char* file2) {
4341 time_t t1 = get_mtime(file1);
4342 time_t t2 = get_mtime(file2);
4343 return t1 - t2;
4344 }
4345
4346 bool os::supports_map_sync() {
4347 return false;
4348 }