1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "libo4.hpp"
41 #include "libperfstat_aix.hpp"
42 #include "libodm_aix.hpp"
43 #include "loadlib_aix.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "misc_aix.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "os_aix.inline.hpp"
49 #include "os_share_aix.hpp"
50 #include "porting_aix.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm_misc.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/extendedPC.hpp"
56 #include "runtime/globals.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/orderAccess.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_5_Compat
135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
136 #endif
137 #ifndef PV_6
138 #define PV_6 0x100000 /* Power PC 6 */
139 #endif
140 #ifndef PV_6_1
141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
142 #endif
143 #ifndef PV_6_Compat
144 #define PV_6_Compat 0x108000 /* Power PC 6 */
145 #endif
146 #ifndef PV_7
147 #define PV_7 0x200000 /* Power PC 7 */
148 #endif
149 #ifndef PV_7_Compat
150 #define PV_7_Compat 0x208000 /* Power PC 7 */
151 #endif
152 #ifndef PV_8
153 #define PV_8 0x300000 /* Power PC 8 */
154 #endif
155 #ifndef PV_8_Compat
156 #define PV_8_Compat 0x308000 /* Power PC 8 */
157 #endif
158
159 static address resolve_function_descriptor_to_code_pointer(address p);
160
161 static void vmembk_print_on(outputStream* os);
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // global variables (for a description see os_aix.hpp)
165
166 julong os::Aix::_physical_memory = 0;
167
168 pthread_t os::Aix::_main_thread = ((pthread_t)0);
169 int os::Aix::_page_size = -1;
170
171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
172 int os::Aix::_on_pase = -1;
173
174 // 0 = uninitialized, otherwise 32 bit number:
175 // 0xVVRRTTSS
176 // VV - major version
177 // RR - minor version
178 // TT - tech level, if known, 0 otherwise
179 // SS - service pack, if known, 0 otherwise
180 uint32_t os::Aix::_os_version = 0;
181
182 // -1 = uninitialized, 0 - no, 1 - yes
183 int os::Aix::_xpg_sus_mode = -1;
184
185 // -1 = uninitialized, 0 - no, 1 - yes
186 int os::Aix::_extshm = -1;
187
188 ////////////////////////////////////////////////////////////////////////////////
189 // local variables
190
191 static volatile jlong max_real_time = 0;
192 static jlong initial_time_count = 0;
193 static int clock_tics_per_sec = 100;
194 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
195 static bool check_signals = true;
196 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
197 static sigset_t SR_sigset;
198
199 // Process break recorded at startup.
200 static address g_brk_at_startup = NULL;
201
202 // This describes the state of multipage support of the underlying
203 // OS. Note that this is of no interest to the outsize world and
204 // therefore should not be defined in AIX class.
205 //
206 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
207 // latter two (16M "large" resp. 16G "huge" pages) require special
208 // setup and are normally not available.
209 //
210 // AIX supports multiple page sizes per process, for:
211 // - Stack (of the primordial thread, so not relevant for us)
212 // - Data - data, bss, heap, for us also pthread stacks
213 // - Text - text code
214 // - shared memory
215 //
216 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
217 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
218 //
219 // For shared memory, page size can be set dynamically via
220 // shmctl(). Different shared memory regions can have different page
221 // sizes.
222 //
223 // More information can be found at AIBM info center:
224 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
225 //
226 static struct {
227 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
228 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
229 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
230 size_t pthr_stack_pagesize; // stack page size of pthread threads
231 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
232 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
233 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
234 int error; // Error describing if something went wrong at multipage init.
235 } g_multipage_support = {
236 (size_t) -1,
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 (size_t) -1,
241 false, false,
242 0
243 };
244
245 // We must not accidentally allocate memory close to the BRK - even if
246 // that would work - because then we prevent the BRK segment from
247 // growing which may result in a malloc OOM even though there is
248 // enough memory. The problem only arises if we shmat() or mmap() at
249 // a specific wish address, e.g. to place the heap in a
250 // compressed-oops-friendly way.
251 static bool is_close_to_brk(address a) {
252 assert0(g_brk_at_startup != NULL);
253 if (a >= g_brk_at_startup &&
254 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
255 return true;
256 }
257 return false;
258 }
259
260 julong os::available_memory() {
261 return Aix::available_memory();
262 }
263
264 julong os::Aix::available_memory() {
265 // Avoid expensive API call here, as returned value will always be null.
266 if (os::Aix::on_pase()) {
267 return 0x0LL;
268 }
269 os::Aix::meminfo_t mi;
270 if (os::Aix::get_meminfo(&mi)) {
271 return mi.real_free;
272 } else {
273 return ULONG_MAX;
274 }
275 }
276
277 julong os::physical_memory() {
278 return Aix::physical_memory();
279 }
280
281 // Return true if user is running as root.
282
283 bool os::have_special_privileges() {
284 static bool init = false;
285 static bool privileges = false;
286 if (!init) {
287 privileges = (getuid() != geteuid()) || (getgid() != getegid());
288 init = true;
289 }
290 return privileges;
291 }
292
293 // Helper function, emulates disclaim64 using multiple 32bit disclaims
294 // because we cannot use disclaim64() on AS/400 and old AIX releases.
295 static bool my_disclaim64(char* addr, size_t size) {
296
297 if (size == 0) {
298 return true;
299 }
300
301 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
302 const unsigned int maxDisclaimSize = 0x40000000;
303
304 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
305 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
306
307 char* p = addr;
308
309 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
310 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
311 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
312 return false;
313 }
314 p += maxDisclaimSize;
315 }
316
317 if (lastDisclaimSize > 0) {
318 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
319 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
320 return false;
321 }
322 }
323
324 return true;
325 }
326
327 // Cpu architecture string
328 #if defined(PPC32)
329 static char cpu_arch[] = "ppc";
330 #elif defined(PPC64)
331 static char cpu_arch[] = "ppc64";
332 #else
333 #error Add appropriate cpu_arch setting
334 #endif
335
336 // Wrap the function "vmgetinfo" which is not available on older OS releases.
337 static int checked_vmgetinfo(void *out, int command, int arg) {
338 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
339 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
340 }
341 return ::vmgetinfo(out, command, arg);
342 }
343
344 // Given an address, returns the size of the page backing that address.
345 size_t os::Aix::query_pagesize(void* addr) {
346
347 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
348 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
349 return 4*K;
350 }
351
352 vm_page_info pi;
353 pi.addr = (uint64_t)addr;
354 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
355 return pi.pagesize;
356 } else {
357 assert(false, "vmgetinfo failed to retrieve page size");
358 return 4*K;
359 }
360 }
361
362 void os::Aix::initialize_system_info() {
363
364 // Get the number of online(logical) cpus instead of configured.
365 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
366 assert(_processor_count > 0, "_processor_count must be > 0");
367
368 // Retrieve total physical storage.
369 os::Aix::meminfo_t mi;
370 if (!os::Aix::get_meminfo(&mi)) {
371 assert(false, "os::Aix::get_meminfo failed.");
372 }
373 _physical_memory = (julong) mi.real_total;
374 }
375
376 // Helper function for tracing page sizes.
377 static const char* describe_pagesize(size_t pagesize) {
378 switch (pagesize) {
379 case 4*K : return "4K";
380 case 64*K: return "64K";
381 case 16*M: return "16M";
382 case 16*G: return "16G";
383 default:
384 assert(false, "surprise");
385 return "??";
386 }
387 }
388
389 // Probe OS for multipage support.
390 // Will fill the global g_multipage_support structure.
391 // Must be called before calling os::large_page_init().
392 static void query_multipage_support() {
393
394 guarantee(g_multipage_support.pagesize == -1,
395 "do not call twice");
396
397 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
398
399 // This really would surprise me.
400 assert(g_multipage_support.pagesize == 4*K, "surprise!");
401
402 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
403 // Default data page size is defined either by linker options (-bdatapsize)
404 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
405 // default should be 4K.
406 {
407 void* p = ::malloc(16*M);
408 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
409 ::free(p);
410 }
411
412 // Query default shm page size (LDR_CNTRL SHMPSIZE).
413 // Note that this is pure curiosity. We do not rely on default page size but set
414 // our own page size after allocated.
415 {
416 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
417 guarantee(shmid != -1, "shmget failed");
418 void* p = ::shmat(shmid, NULL, 0);
419 ::shmctl(shmid, IPC_RMID, NULL);
420 guarantee(p != (void*) -1, "shmat failed");
421 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
422 ::shmdt(p);
423 }
424
425 // Before querying the stack page size, make sure we are not running as primordial
426 // thread (because primordial thread's stack may have different page size than
427 // pthread thread stacks). Running a VM on the primordial thread won't work for a
428 // number of reasons so we may just as well guarantee it here.
429 guarantee0(!os::is_primordial_thread());
430
431 // Query pthread stack page size. Should be the same as data page size because
432 // pthread stacks are allocated from C-Heap.
433 {
434 int dummy = 0;
435 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
436 }
437
438 // Query default text page size (LDR_CNTRL TEXTPSIZE).
439 {
440 address any_function =
441 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
442 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
443 }
444
445 // Now probe for support of 64K pages and 16M pages.
446
447 // Before OS/400 V6R1, there is no support for pages other than 4K.
448 if (os::Aix::on_pase_V5R4_or_older()) {
449 trcVerbose("OS/400 < V6R1 - no large page support.");
450 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
451 goto query_multipage_support_end;
452 }
453
454 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
455 {
456 const int MAX_PAGE_SIZES = 4;
457 psize_t sizes[MAX_PAGE_SIZES];
458 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
459 if (num_psizes == -1) {
460 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
461 trcVerbose("disabling multipage support.");
462 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
463 goto query_multipage_support_end;
464 }
465 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
466 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
467 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
468 for (int i = 0; i < num_psizes; i ++) {
469 trcVerbose(" %s ", describe_pagesize(sizes[i]));
470 }
471
472 // Can we use 64K, 16M pages?
473 for (int i = 0; i < num_psizes; i ++) {
474 const size_t pagesize = sizes[i];
475 if (pagesize != 64*K && pagesize != 16*M) {
476 continue;
477 }
478 bool can_use = false;
479 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
480 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
481 IPC_CREAT | S_IRUSR | S_IWUSR);
482 guarantee0(shmid != -1); // Should always work.
483 // Try to set pagesize.
484 struct shmid_ds shm_buf = { 0 };
485 shm_buf.shm_pagesize = pagesize;
486 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
487 const int en = errno;
488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
489 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
490 errno);
491 } else {
492 // Attach and double check pageisze.
493 void* p = ::shmat(shmid, NULL, 0);
494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
495 guarantee0(p != (void*) -1); // Should always work.
496 const size_t real_pagesize = os::Aix::query_pagesize(p);
497 if (real_pagesize != pagesize) {
498 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
499 } else {
500 can_use = true;
501 }
502 ::shmdt(p);
503 }
504 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
505 if (pagesize == 64*K) {
506 g_multipage_support.can_use_64K_pages = can_use;
507 } else if (pagesize == 16*M) {
508 g_multipage_support.can_use_16M_pages = can_use;
509 }
510 }
511
512 } // end: check which pages can be used for shared memory
513
514 query_multipage_support_end:
515
516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
517 describe_pagesize(g_multipage_support.pagesize));
518 trcVerbose("Data page size (C-Heap, bss, etc): %s",
519 describe_pagesize(g_multipage_support.datapsize));
520 trcVerbose("Text page size: %s",
521 describe_pagesize(g_multipage_support.textpsize));
522 trcVerbose("Thread stack page size (pthread): %s",
523 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
524 trcVerbose("Default shared memory page size: %s",
525 describe_pagesize(g_multipage_support.shmpsize));
526 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
527 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
528 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
529 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
530 trcVerbose("Multipage error details: %d",
531 g_multipage_support.error);
532
533 // sanity checks
534 assert0(g_multipage_support.pagesize == 4*K);
535 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
536 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
537 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
538 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
539
540 }
541
542 void os::init_system_properties_values() {
543
544 #define DEFAULT_LIBPATH "/lib:/usr/lib"
545 #define EXTENSIONS_DIR "/lib/ext"
546
547 // Buffer that fits several sprintfs.
548 // Note that the space for the trailing null is provided
549 // by the nulls included by the sizeof operator.
550 const size_t bufsize =
551 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
554
555 // sysclasspath, java_home, dll_dir
556 {
557 char *pslash;
558 os::jvm_path(buf, bufsize);
559
560 // Found the full path to libjvm.so.
561 // Now cut the path to <java_home>/jre if we can.
562 pslash = strrchr(buf, '/');
563 if (pslash != NULL) {
564 *pslash = '\0'; // Get rid of /libjvm.so.
565 }
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
569 }
570 Arguments::set_dll_dir(buf);
571
572 if (pslash != NULL) {
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /lib.
576 }
577 }
578 Arguments::set_java_home(buf);
579 set_boot_path('/', ':');
580 }
581
582 // Where to look for native libraries.
583
584 // On Aix we get the user setting of LIBPATH.
585 // Eventually, all the library path setting will be done here.
586 // Get the user setting of LIBPATH.
587 const char *v = ::getenv("LIBPATH");
588 const char *v_colon = ":";
589 if (v == NULL) { v = ""; v_colon = ""; }
590
591 // Concatenate user and invariant part of ld_library_path.
592 // That's +1 for the colon and +1 for the trailing '\0'.
593 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
594 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
595 Arguments::set_library_path(ld_library_path);
596 FREE_C_HEAP_ARRAY(char, ld_library_path);
597
598 // Extensions directories.
599 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
600 Arguments::set_ext_dirs(buf);
601
602 FREE_C_HEAP_ARRAY(char, buf);
603
604 #undef DEFAULT_LIBPATH
605 #undef EXTENSIONS_DIR
606 }
607
608 ////////////////////////////////////////////////////////////////////////////////
609 // breakpoint support
610
611 void os::breakpoint() {
612 BREAKPOINT;
613 }
614
615 extern "C" void breakpoint() {
616 // use debugger to set breakpoint here
617 }
618
619 ////////////////////////////////////////////////////////////////////////////////
620 // signal support
621
622 debug_only(static bool signal_sets_initialized = false);
623 static sigset_t unblocked_sigs, vm_sigs;
624
625 void os::Aix::signal_sets_init() {
626 // Should also have an assertion stating we are still single-threaded.
627 assert(!signal_sets_initialized, "Already initialized");
628 // Fill in signals that are necessarily unblocked for all threads in
629 // the VM. Currently, we unblock the following signals:
630 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
631 // by -Xrs (=ReduceSignalUsage));
632 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
633 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
634 // the dispositions or masks wrt these signals.
635 // Programs embedding the VM that want to use the above signals for their
636 // own purposes must, at this time, use the "-Xrs" option to prevent
637 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
638 // (See bug 4345157, and other related bugs).
639 // In reality, though, unblocking these signals is really a nop, since
640 // these signals are not blocked by default.
641 sigemptyset(&unblocked_sigs);
642 sigaddset(&unblocked_sigs, SIGILL);
643 sigaddset(&unblocked_sigs, SIGSEGV);
644 sigaddset(&unblocked_sigs, SIGBUS);
645 sigaddset(&unblocked_sigs, SIGFPE);
646 sigaddset(&unblocked_sigs, SIGTRAP);
647 sigaddset(&unblocked_sigs, SR_signum);
648
649 if (!ReduceSignalUsage) {
650 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
651 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
652 }
653 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
654 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
655 }
656 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
657 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
658 }
659 }
660 // Fill in signals that are blocked by all but the VM thread.
661 sigemptyset(&vm_sigs);
662 if (!ReduceSignalUsage)
663 sigaddset(&vm_sigs, BREAK_SIGNAL);
664 debug_only(signal_sets_initialized = true);
665 }
666
667 // These are signals that are unblocked while a thread is running Java.
668 // (For some reason, they get blocked by default.)
669 sigset_t* os::Aix::unblocked_signals() {
670 assert(signal_sets_initialized, "Not initialized");
671 return &unblocked_sigs;
672 }
673
674 // These are the signals that are blocked while a (non-VM) thread is
675 // running Java. Only the VM thread handles these signals.
676 sigset_t* os::Aix::vm_signals() {
677 assert(signal_sets_initialized, "Not initialized");
678 return &vm_sigs;
679 }
680
681 void os::Aix::hotspot_sigmask(Thread* thread) {
682
683 //Save caller's signal mask before setting VM signal mask
684 sigset_t caller_sigmask;
685 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
686
687 OSThread* osthread = thread->osthread();
688 osthread->set_caller_sigmask(caller_sigmask);
689
690 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
691
692 if (!ReduceSignalUsage) {
693 if (thread->is_VM_thread()) {
694 // Only the VM thread handles BREAK_SIGNAL ...
695 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
696 } else {
697 // ... all other threads block BREAK_SIGNAL
698 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
699 }
700 }
701 }
702
703 // retrieve memory information.
704 // Returns false if something went wrong;
705 // content of pmi undefined in this case.
706 bool os::Aix::get_meminfo(meminfo_t* pmi) {
707
708 assert(pmi, "get_meminfo: invalid parameter");
709
710 memset(pmi, 0, sizeof(meminfo_t));
711
712 if (os::Aix::on_pase()) {
713 // On PASE, use the libo4 porting library.
714
715 unsigned long long virt_total = 0;
716 unsigned long long real_total = 0;
717 unsigned long long real_free = 0;
718 unsigned long long pgsp_total = 0;
719 unsigned long long pgsp_free = 0;
720 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
721 pmi->virt_total = virt_total;
722 pmi->real_total = real_total;
723 pmi->real_free = real_free;
724 pmi->pgsp_total = pgsp_total;
725 pmi->pgsp_free = pgsp_free;
726 return true;
727 }
728 return false;
729
730 } else {
731
732 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
733 // See:
734 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
735 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
738
739 perfstat_memory_total_t psmt;
740 memset (&psmt, '\0', sizeof(psmt));
741 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
742 if (rc == -1) {
743 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
744 assert(0, "perfstat_memory_total() failed");
745 return false;
746 }
747
748 assert(rc == 1, "perfstat_memory_total() - weird return code");
749
750 // excerpt from
751 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
752 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
753 // The fields of perfstat_memory_total_t:
754 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
755 // u_longlong_t real_total Total real memory (in 4 KB pages).
756 // u_longlong_t real_free Free real memory (in 4 KB pages).
757 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
758 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
759
760 pmi->virt_total = psmt.virt_total * 4096;
761 pmi->real_total = psmt.real_total * 4096;
762 pmi->real_free = psmt.real_free * 4096;
763 pmi->pgsp_total = psmt.pgsp_total * 4096;
764 pmi->pgsp_free = psmt.pgsp_free * 4096;
765
766 return true;
767
768 }
769 } // end os::Aix::get_meminfo
770
771 //////////////////////////////////////////////////////////////////////////////
772 // create new thread
773
774 // Thread start routine for all newly created threads
775 static void *thread_native_entry(Thread *thread) {
776
777 // find out my own stack dimensions
778 {
779 // actually, this should do exactly the same as thread->record_stack_base_and_size...
780 thread->set_stack_base(os::current_stack_base());
781 thread->set_stack_size(os::current_stack_size());
782 }
783
784 const pthread_t pthread_id = ::pthread_self();
785 const tid_t kernel_thread_id = ::thread_self();
786
787 LogTarget(Info, os, thread) lt;
788 if (lt.is_enabled()) {
789 address low_address = thread->stack_end();
790 address high_address = thread->stack_base();
791 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
792 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
793 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
794 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
795 }
796
797 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
798 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
799 // tools hook pthread_create(). In this case, we may run into problems establishing
800 // guard pages on those stacks, because the stacks may reside in memory which is not
801 // protectable (shmated).
802 if (thread->stack_base() > ::sbrk(0)) {
803 log_warning(os, thread)("Thread stack not in data segment.");
804 }
805
806 // Try to randomize the cache line index of hot stack frames.
807 // This helps when threads of the same stack traces evict each other's
808 // cache lines. The threads can be either from the same JVM instance, or
809 // from different JVM instances. The benefit is especially true for
810 // processors with hyperthreading technology.
811
812 static int counter = 0;
813 int pid = os::current_process_id();
814 alloca(((pid ^ counter++) & 7) * 128);
815
816 thread->initialize_thread_current();
817
818 OSThread* osthread = thread->osthread();
819
820 // Thread_id is pthread id.
821 osthread->set_thread_id(pthread_id);
822
823 // .. but keep kernel thread id too for diagnostics
824 osthread->set_kernel_thread_id(kernel_thread_id);
825
826 // Initialize signal mask for this thread.
827 os::Aix::hotspot_sigmask(thread);
828
829 // Initialize floating point control register.
830 os::Aix::init_thread_fpu_state();
831
832 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
833
834 // Call one more level start routine.
835 thread->run();
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 // If a thread has not deleted itself ("delete this") as part of its
841 // termination sequence, we have to ensure thread-local-storage is
842 // cleared before we actually terminate. No threads should ever be
843 // deleted asynchronously with respect to their termination.
844 if (Thread::current_or_null_safe() != NULL) {
845 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
846 thread->clear_thread_current();
847 }
848
849 return 0;
850 }
851
852 bool os::create_thread(Thread* thread, ThreadType thr_type,
853 size_t req_stack_size) {
854
855 assert(thread->osthread() == NULL, "caller responsible");
856
857 // Allocate the OSThread object.
858 OSThread* osthread = new OSThread(NULL, NULL);
859 if (osthread == NULL) {
860 return false;
861 }
862
863 // Set the correct thread state.
864 osthread->set_thread_type(thr_type);
865
866 // Initial state is ALLOCATED but not INITIALIZED
867 osthread->set_state(ALLOCATED);
868
869 thread->set_osthread(osthread);
870
871 // Init thread attributes.
872 pthread_attr_t attr;
873 pthread_attr_init(&attr);
874 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
875
876 // Make sure we run in 1:1 kernel-user-thread mode.
877 if (os::Aix::on_aix()) {
878 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
879 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
880 }
881
882 // Start in suspended state, and in os::thread_start, wake the thread up.
883 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
884
885 // Calculate stack size if it's not specified by caller.
886 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
887
888 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
889 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
890 // This very much looks like a pthread lib error. As a workaround, increase the stack size
891 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
892 if (stack_size < 4096 * K) {
893 stack_size += 64 * K;
894 }
895
896 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
897 // thread size in attr unchanged. If this is the minimal stack size as set
898 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
899 // guard pages might not fit on the tiny stack created.
900 int ret = pthread_attr_setstacksize(&attr, stack_size);
901 if (ret != 0) {
902 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
903 stack_size / K);
904 }
905
906 // Save some cycles and a page by disabling OS guard pages where we have our own
907 // VM guard pages (in java threads). For other threads, keep system default guard
908 // pages in place.
909 if (thr_type == java_thread || thr_type == compiler_thread) {
910 ret = pthread_attr_setguardsize(&attr, 0);
911 }
912
913 pthread_t tid = 0;
914 if (ret == 0) {
915 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
916 }
917
918 if (ret == 0) {
919 char buf[64];
920 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
921 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
922 } else {
923 char buf[64];
924 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
925 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
926 }
927
928 pthread_attr_destroy(&attr);
929
930 if (ret != 0) {
931 // Need to clean up stuff we've allocated so far.
932 thread->set_osthread(NULL);
933 delete osthread;
934 return false;
935 }
936
937 // OSThread::thread_id is the pthread id.
938 osthread->set_thread_id(tid);
939
940 return true;
941 }
942
943 /////////////////////////////////////////////////////////////////////////////
944 // attach existing thread
945
946 // bootstrap the main thread
947 bool os::create_main_thread(JavaThread* thread) {
948 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
949 return create_attached_thread(thread);
950 }
951
952 bool os::create_attached_thread(JavaThread* thread) {
953 #ifdef ASSERT
954 thread->verify_not_published();
955 #endif
956
957 // Allocate the OSThread object
958 OSThread* osthread = new OSThread(NULL, NULL);
959
960 if (osthread == NULL) {
961 return false;
962 }
963
964 const pthread_t pthread_id = ::pthread_self();
965 const tid_t kernel_thread_id = ::thread_self();
966
967 // OSThread::thread_id is the pthread id.
968 osthread->set_thread_id(pthread_id);
969
970 // .. but keep kernel thread id too for diagnostics
971 osthread->set_kernel_thread_id(kernel_thread_id);
972
973 // initialize floating point control register
974 os::Aix::init_thread_fpu_state();
975
976 // Initial thread state is RUNNABLE
977 osthread->set_state(RUNNABLE);
978
979 thread->set_osthread(osthread);
980
981 if (UseNUMA) {
982 int lgrp_id = os::numa_get_group_id();
983 if (lgrp_id != -1) {
984 thread->set_lgrp_id(lgrp_id);
985 }
986 }
987
988 // initialize signal mask for this thread
989 // and save the caller's signal mask
990 os::Aix::hotspot_sigmask(thread);
991
992 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
993 os::current_thread_id(), (uintx) kernel_thread_id);
994
995 return true;
996 }
997
998 void os::pd_start_thread(Thread* thread) {
999 int status = pthread_continue_np(thread->osthread()->pthread_id());
1000 assert(status == 0, "thr_continue failed");
1001 }
1002
1003 // Free OS resources related to the OSThread
1004 void os::free_thread(OSThread* osthread) {
1005 assert(osthread != NULL, "osthread not set");
1006
1007 // We are told to free resources of the argument thread,
1008 // but we can only really operate on the current thread.
1009 assert(Thread::current()->osthread() == osthread,
1010 "os::free_thread but not current thread");
1011
1012 // Restore caller's signal mask
1013 sigset_t sigmask = osthread->caller_sigmask();
1014 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1015
1016 delete osthread;
1017 }
1018
1019 ////////////////////////////////////////////////////////////////////////////////
1020 // time support
1021
1022 // Time since start-up in seconds to a fine granularity.
1023 // Used by VMSelfDestructTimer and the MemProfiler.
1024 double os::elapsedTime() {
1025 return (double)(os::elapsed_counter()) * 0.000001;
1026 }
1027
1028 jlong os::elapsed_counter() {
1029 timeval time;
1030 int status = gettimeofday(&time, NULL);
1031 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1032 }
1033
1034 jlong os::elapsed_frequency() {
1035 return (1000 * 1000);
1036 }
1037
1038 bool os::supports_vtime() { return true; }
1039 bool os::enable_vtime() { return false; }
1040 bool os::vtime_enabled() { return false; }
1041
1042 double os::elapsedVTime() {
1043 struct rusage usage;
1044 int retval = getrusage(RUSAGE_THREAD, &usage);
1045 if (retval == 0) {
1046 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1047 } else {
1048 // better than nothing, but not much
1049 return elapsedTime();
1050 }
1051 }
1052
1053 jlong os::javaTimeMillis() {
1054 timeval time;
1055 int status = gettimeofday(&time, NULL);
1056 assert(status != -1, "aix error at gettimeofday()");
1057 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1058 }
1059
1060 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1061 timeval time;
1062 int status = gettimeofday(&time, NULL);
1063 assert(status != -1, "aix error at gettimeofday()");
1064 seconds = jlong(time.tv_sec);
1065 nanos = jlong(time.tv_usec) * 1000;
1066 }
1067
1068 // We use mread_real_time here.
1069 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1070 // it has to be converted to real time. AIX documentations suggests to do
1071 // this unconditionally, so we do it.
1072 //
1073 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1074 //
1075 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1076 // conversion is necessary. However, mread_real_time will not return
1077 // monotonic results but merely matches read_real_time. So we need a tweak
1078 // to ensure monotonic results.
1079 //
1080 // For PASE no public documentation exists, just word by IBM
1081 jlong os::javaTimeNanos() {
1082 timebasestruct_t time;
1083 int rc = mread_real_time(&time, TIMEBASE_SZ);
1084 if (os::Aix::on_pase()) {
1085 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1086 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1087 jlong prev = max_real_time;
1088 if (now <= prev) {
1089 return prev; // same or retrograde time;
1090 }
1091 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1092 assert(obsv >= prev, "invariant"); // Monotonicity
1093 // If the CAS succeeded then we're done and return "now".
1094 // If the CAS failed and the observed value "obsv" is >= now then
1095 // we should return "obsv". If the CAS failed and now > obsv > prv then
1096 // some other thread raced this thread and installed a new value, in which case
1097 // we could either (a) retry the entire operation, (b) retry trying to install now
1098 // or (c) just return obsv. We use (c). No loop is required although in some cases
1099 // we might discard a higher "now" value in deference to a slightly lower but freshly
1100 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1101 // to (a) or (b) -- and greatly reduces coherence traffic.
1102 // We might also condition (c) on the magnitude of the delta between obsv and now.
1103 // Avoiding excessive CAS operations to hot RW locations is critical.
1104 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1105 return (prev == obsv) ? now : obsv;
1106 } else {
1107 if (rc != RTC_POWER) {
1108 rc = time_base_to_time(&time, TIMEBASE_SZ);
1109 assert(rc != -1, "error calling time_base_to_time()");
1110 }
1111 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1112 }
1113 }
1114
1115 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1116 info_ptr->max_value = ALL_64_BITS;
1117 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1118 info_ptr->may_skip_backward = false;
1119 info_ptr->may_skip_forward = false;
1120 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1121 }
1122
1123 // Return the real, user, and system times in seconds from an
1124 // arbitrary fixed point in the past.
1125 bool os::getTimesSecs(double* process_real_time,
1126 double* process_user_time,
1127 double* process_system_time) {
1128 struct tms ticks;
1129 clock_t real_ticks = times(&ticks);
1130
1131 if (real_ticks == (clock_t) (-1)) {
1132 return false;
1133 } else {
1134 double ticks_per_second = (double) clock_tics_per_sec;
1135 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1136 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1137 *process_real_time = ((double) real_ticks) / ticks_per_second;
1138
1139 return true;
1140 }
1141 }
1142
1143 char * os::local_time_string(char *buf, size_t buflen) {
1144 struct tm t;
1145 time_t long_time;
1146 time(&long_time);
1147 localtime_r(&long_time, &t);
1148 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1149 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1150 t.tm_hour, t.tm_min, t.tm_sec);
1151 return buf;
1152 }
1153
1154 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1155 return localtime_r(clock, res);
1156 }
1157
1158 ////////////////////////////////////////////////////////////////////////////////
1159 // runtime exit support
1160
1161 // Note: os::shutdown() might be called very early during initialization, or
1162 // called from signal handler. Before adding something to os::shutdown(), make
1163 // sure it is async-safe and can handle partially initialized VM.
1164 void os::shutdown() {
1165
1166 // allow PerfMemory to attempt cleanup of any persistent resources
1167 perfMemory_exit();
1168
1169 // needs to remove object in file system
1170 AttachListener::abort();
1171
1172 // flush buffered output, finish log files
1173 ostream_abort();
1174
1175 // Check for abort hook
1176 abort_hook_t abort_hook = Arguments::abort_hook();
1177 if (abort_hook != NULL) {
1178 abort_hook();
1179 }
1180 }
1181
1182 // Note: os::abort() might be called very early during initialization, or
1183 // called from signal handler. Before adding something to os::abort(), make
1184 // sure it is async-safe and can handle partially initialized VM.
1185 void os::abort(bool dump_core, void* siginfo, const void* context) {
1186 os::shutdown();
1187 if (dump_core) {
1188 #ifndef PRODUCT
1189 fdStream out(defaultStream::output_fd());
1190 out.print_raw("Current thread is ");
1191 char buf[16];
1192 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1193 out.print_raw_cr(buf);
1194 out.print_raw_cr("Dumping core ...");
1195 #endif
1196 ::abort(); // dump core
1197 }
1198
1199 ::exit(1);
1200 }
1201
1202 // Die immediately, no exit hook, no abort hook, no cleanup.
1203 void os::die() {
1204 ::abort();
1205 }
1206
1207 // This method is a copy of JDK's sysGetLastErrorString
1208 // from src/solaris/hpi/src/system_md.c
1209
1210 size_t os::lasterror(char *buf, size_t len) {
1211 if (errno == 0) return 0;
1212
1213 const char *s = os::strerror(errno);
1214 size_t n = ::strlen(s);
1215 if (n >= len) {
1216 n = len - 1;
1217 }
1218 ::strncpy(buf, s, n);
1219 buf[n] = '\0';
1220 return n;
1221 }
1222
1223 intx os::current_thread_id() {
1224 return (intx)pthread_self();
1225 }
1226
1227 int os::current_process_id() {
1228 return getpid();
1229 }
1230
1231 // DLL functions
1232
1233 const char* os::dll_file_extension() { return ".so"; }
1234
1235 // This must be hard coded because it's the system's temporary
1236 // directory not the java application's temp directory, ala java.io.tmpdir.
1237 const char* os::get_temp_directory() { return "/tmp"; }
1238
1239 // Check if addr is inside libjvm.so.
1240 bool os::address_is_in_vm(address addr) {
1241
1242 // Input could be a real pc or a function pointer literal. The latter
1243 // would be a function descriptor residing in the data segment of a module.
1244 loaded_module_t lm;
1245 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1246 return lm.is_in_vm;
1247 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1248 return lm.is_in_vm;
1249 } else {
1250 return false;
1251 }
1252
1253 }
1254
1255 // Resolve an AIX function descriptor literal to a code pointer.
1256 // If the input is a valid code pointer to a text segment of a loaded module,
1257 // it is returned unchanged.
1258 // If the input is a valid AIX function descriptor, it is resolved to the
1259 // code entry point.
1260 // If the input is neither a valid function descriptor nor a valid code pointer,
1261 // NULL is returned.
1262 static address resolve_function_descriptor_to_code_pointer(address p) {
1263
1264 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1265 // It is a real code pointer.
1266 return p;
1267 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1268 // Pointer to data segment, potential function descriptor.
1269 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1270 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1271 // It is a function descriptor.
1272 return code_entry;
1273 }
1274 }
1275
1276 return NULL;
1277 }
1278
1279 bool os::dll_address_to_function_name(address addr, char *buf,
1280 int buflen, int *offset,
1281 bool demangle) {
1282 if (offset) {
1283 *offset = -1;
1284 }
1285 // Buf is not optional, but offset is optional.
1286 assert(buf != NULL, "sanity check");
1287 buf[0] = '\0';
1288
1289 // Resolve function ptr literals first.
1290 addr = resolve_function_descriptor_to_code_pointer(addr);
1291 if (!addr) {
1292 return false;
1293 }
1294
1295 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1296 }
1297
1298 bool os::dll_address_to_library_name(address addr, char* buf,
1299 int buflen, int* offset) {
1300 if (offset) {
1301 *offset = -1;
1302 }
1303 // Buf is not optional, but offset is optional.
1304 assert(buf != NULL, "sanity check");
1305 buf[0] = '\0';
1306
1307 // Resolve function ptr literals first.
1308 addr = resolve_function_descriptor_to_code_pointer(addr);
1309 if (!addr) {
1310 return false;
1311 }
1312
1313 return AixSymbols::get_module_name(addr, buf, buflen);
1314 }
1315
1316 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1317 // for the same architecture as Hotspot is running on.
1318 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1319
1320 if (ebuf && ebuflen > 0) {
1321 ebuf[0] = '\0';
1322 ebuf[ebuflen - 1] = '\0';
1323 }
1324
1325 if (!filename || strlen(filename) == 0) {
1326 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1327 return NULL;
1328 }
1329
1330 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1331 void * result= ::dlopen(filename, RTLD_LAZY);
1332 if (result != NULL) {
1333 // Reload dll cache. Don't do this in signal handling.
1334 LoadedLibraries::reload();
1335 return result;
1336 } else {
1337 // error analysis when dlopen fails
1338 const char* const error_report = ::dlerror();
1339 if (error_report && ebuf && ebuflen > 0) {
1340 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1341 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1342 }
1343 }
1344 return NULL;
1345 }
1346
1347 void* os::dll_lookup(void* handle, const char* name) {
1348 void* res = dlsym(handle, name);
1349 return res;
1350 }
1351
1352 void* os::get_default_process_handle() {
1353 return (void*)::dlopen(NULL, RTLD_LAZY);
1354 }
1355
1356 void os::print_dll_info(outputStream *st) {
1357 st->print_cr("Dynamic libraries:");
1358 LoadedLibraries::print(st);
1359 }
1360
1361 void os::get_summary_os_info(char* buf, size_t buflen) {
1362 // There might be something more readable than uname results for AIX.
1363 struct utsname name;
1364 uname(&name);
1365 snprintf(buf, buflen, "%s %s", name.release, name.version);
1366 }
1367
1368 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1369 // Not yet implemented.
1370 return 0;
1371 }
1372
1373 void os::print_os_info_brief(outputStream* st) {
1374 uint32_t ver = os::Aix::os_version();
1375 st->print_cr("AIX kernel version %u.%u.%u.%u",
1376 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1377
1378 os::Posix::print_uname_info(st);
1379
1380 // Linux uses print_libversion_info(st); here.
1381 }
1382
1383 void os::print_os_info(outputStream* st) {
1384 st->print("OS:");
1385
1386 st->print("uname:");
1387 struct utsname name;
1388 uname(&name);
1389 st->print(name.sysname); st->print(" ");
1390 st->print(name.nodename); st->print(" ");
1391 st->print(name.release); st->print(" ");
1392 st->print(name.version); st->print(" ");
1393 st->print(name.machine);
1394 st->cr();
1395
1396 uint32_t ver = os::Aix::os_version();
1397 st->print_cr("AIX kernel version %u.%u.%u.%u",
1398 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1399
1400 os::Posix::print_rlimit_info(st);
1401
1402 // load average
1403 st->print("load average:");
1404 double loadavg[3] = {-1.L, -1.L, -1.L};
1405 os::loadavg(loadavg, 3);
1406 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1407 st->cr();
1408
1409 // print wpar info
1410 libperfstat::wparinfo_t wi;
1411 if (libperfstat::get_wparinfo(&wi)) {
1412 st->print_cr("wpar info");
1413 st->print_cr("name: %s", wi.name);
1414 st->print_cr("id: %d", wi.wpar_id);
1415 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1416 }
1417
1418 // print partition info
1419 libperfstat::partitioninfo_t pi;
1420 if (libperfstat::get_partitioninfo(&pi)) {
1421 st->print_cr("partition info");
1422 st->print_cr(" name: %s", pi.name);
1423 }
1424
1425 }
1426
1427 void os::print_memory_info(outputStream* st) {
1428
1429 st->print_cr("Memory:");
1430
1431 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1432 describe_pagesize(g_multipage_support.pagesize));
1433 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1434 describe_pagesize(g_multipage_support.datapsize));
1435 st->print_cr(" Text page size: %s",
1436 describe_pagesize(g_multipage_support.textpsize));
1437 st->print_cr(" Thread stack page size (pthread): %s",
1438 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1439 st->print_cr(" Default shared memory page size: %s",
1440 describe_pagesize(g_multipage_support.shmpsize));
1441 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1442 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1443 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1444 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1445 st->print_cr(" Multipage error: %d",
1446 g_multipage_support.error);
1447 st->cr();
1448 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1449
1450 // print out LDR_CNTRL because it affects the default page sizes
1451 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1452 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1453
1454 // Print out EXTSHM because it is an unsupported setting.
1455 const char* const extshm = ::getenv("EXTSHM");
1456 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1457 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1458 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1459 }
1460
1461 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1462 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1463 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1464 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1465 st->cr();
1466
1467 os::Aix::meminfo_t mi;
1468 if (os::Aix::get_meminfo(&mi)) {
1469 if (os::Aix::on_aix()) {
1470 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1471 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1472 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1473 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1474 } else {
1475 // PASE - Numbers are result of QWCRSSTS; they mean:
1476 // real_total: Sum of all system pools
1477 // real_free: always 0
1478 // pgsp_total: we take the size of the system ASP
1479 // pgsp_free: size of system ASP times percentage of system ASP unused
1480 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1481 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1482 st->print_cr("%% system asp used : %.2f",
1483 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1484 }
1485 }
1486 st->cr();
1487
1488 // Print program break.
1489 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1490 address brk_now = (address)::sbrk(0);
1491 if (brk_now != (address)-1) {
1492 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1493 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1494 }
1495 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1496 st->cr();
1497
1498 // Print segments allocated with os::reserve_memory.
1499 st->print_cr("internal virtual memory regions used by vm:");
1500 vmembk_print_on(st);
1501 }
1502
1503 // Get a string for the cpuinfo that is a summary of the cpu type
1504 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1505 // read _system_configuration.version
1506 switch (_system_configuration.version) {
1507 case PV_8:
1508 strncpy(buf, "Power PC 8", buflen);
1509 break;
1510 case PV_7:
1511 strncpy(buf, "Power PC 7", buflen);
1512 break;
1513 case PV_6_1:
1514 strncpy(buf, "Power PC 6 DD1.x", buflen);
1515 break;
1516 case PV_6:
1517 strncpy(buf, "Power PC 6", buflen);
1518 break;
1519 case PV_5:
1520 strncpy(buf, "Power PC 5", buflen);
1521 break;
1522 case PV_5_2:
1523 strncpy(buf, "Power PC 5_2", buflen);
1524 break;
1525 case PV_5_3:
1526 strncpy(buf, "Power PC 5_3", buflen);
1527 break;
1528 case PV_5_Compat:
1529 strncpy(buf, "PV_5_Compat", buflen);
1530 break;
1531 case PV_6_Compat:
1532 strncpy(buf, "PV_6_Compat", buflen);
1533 break;
1534 case PV_7_Compat:
1535 strncpy(buf, "PV_7_Compat", buflen);
1536 break;
1537 case PV_8_Compat:
1538 strncpy(buf, "PV_8_Compat", buflen);
1539 break;
1540 default:
1541 strncpy(buf, "unknown", buflen);
1542 }
1543 }
1544
1545 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1546 // Nothing to do beyond of what os::print_cpu_info() does.
1547 }
1548
1549 static void print_signal_handler(outputStream* st, int sig,
1550 char* buf, size_t buflen);
1551
1552 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1553 st->print_cr("Signal Handlers:");
1554 print_signal_handler(st, SIGSEGV, buf, buflen);
1555 print_signal_handler(st, SIGBUS , buf, buflen);
1556 print_signal_handler(st, SIGFPE , buf, buflen);
1557 print_signal_handler(st, SIGPIPE, buf, buflen);
1558 print_signal_handler(st, SIGXFSZ, buf, buflen);
1559 print_signal_handler(st, SIGILL , buf, buflen);
1560 print_signal_handler(st, SR_signum, buf, buflen);
1561 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1562 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1563 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1564 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1565 print_signal_handler(st, SIGTRAP, buf, buflen);
1566 // We also want to know if someone else adds a SIGDANGER handler because
1567 // that will interfere with OOM killling.
1568 print_signal_handler(st, SIGDANGER, buf, buflen);
1569 }
1570
1571 static char saved_jvm_path[MAXPATHLEN] = {0};
1572
1573 // Find the full path to the current module, libjvm.so.
1574 void os::jvm_path(char *buf, jint buflen) {
1575 // Error checking.
1576 if (buflen < MAXPATHLEN) {
1577 assert(false, "must use a large-enough buffer");
1578 buf[0] = '\0';
1579 return;
1580 }
1581 // Lazy resolve the path to current module.
1582 if (saved_jvm_path[0] != 0) {
1583 strcpy(buf, saved_jvm_path);
1584 return;
1585 }
1586
1587 Dl_info dlinfo;
1588 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1589 assert(ret != 0, "cannot locate libjvm");
1590 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1591 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1592
1593 if (Arguments::sun_java_launcher_is_altjvm()) {
1594 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1595 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1596 // If "/jre/lib/" appears at the right place in the string, then
1597 // assume we are installed in a JDK and we're done. Otherwise, check
1598 // for a JAVA_HOME environment variable and fix up the path so it
1599 // looks like libjvm.so is installed there (append a fake suffix
1600 // hotspot/libjvm.so).
1601 const char *p = buf + strlen(buf) - 1;
1602 for (int count = 0; p > buf && count < 4; ++count) {
1603 for (--p; p > buf && *p != '/'; --p)
1604 /* empty */ ;
1605 }
1606
1607 if (strncmp(p, "/jre/lib/", 9) != 0) {
1608 // Look for JAVA_HOME in the environment.
1609 char* java_home_var = ::getenv("JAVA_HOME");
1610 if (java_home_var != NULL && java_home_var[0] != 0) {
1611 char* jrelib_p;
1612 int len;
1613
1614 // Check the current module name "libjvm.so".
1615 p = strrchr(buf, '/');
1616 if (p == NULL) {
1617 return;
1618 }
1619 assert(strstr(p, "/libjvm") == p, "invalid library name");
1620
1621 rp = os::Posix::realpath(java_home_var, buf, buflen);
1622 if (rp == NULL) {
1623 return;
1624 }
1625
1626 // determine if this is a legacy image or modules image
1627 // modules image doesn't have "jre" subdirectory
1628 len = strlen(buf);
1629 assert(len < buflen, "Ran out of buffer room");
1630 jrelib_p = buf + len;
1631 snprintf(jrelib_p, buflen-len, "/jre/lib");
1632 if (0 != access(buf, F_OK)) {
1633 snprintf(jrelib_p, buflen-len, "/lib");
1634 }
1635
1636 if (0 == access(buf, F_OK)) {
1637 // Use current module name "libjvm.so"
1638 len = strlen(buf);
1639 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1640 } else {
1641 // Go back to path of .so
1642 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1643 if (rp == NULL) {
1644 return;
1645 }
1646 }
1647 }
1648 }
1649 }
1650
1651 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1652 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1653 }
1654
1655 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1656 // no prefix required, not even "_"
1657 }
1658
1659 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1660 // no suffix required
1661 }
1662
1663 ////////////////////////////////////////////////////////////////////////////////
1664 // sun.misc.Signal support
1665
1666 static volatile jint sigint_count = 0;
1667
1668 static void
1669 UserHandler(int sig, void *siginfo, void *context) {
1670 // 4511530 - sem_post is serialized and handled by the manager thread. When
1671 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1672 // don't want to flood the manager thread with sem_post requests.
1673 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1674 return;
1675
1676 // Ctrl-C is pressed during error reporting, likely because the error
1677 // handler fails to abort. Let VM die immediately.
1678 if (sig == SIGINT && VMError::is_error_reported()) {
1679 os::die();
1680 }
1681
1682 os::signal_notify(sig);
1683 }
1684
1685 void* os::user_handler() {
1686 return CAST_FROM_FN_PTR(void*, UserHandler);
1687 }
1688
1689 extern "C" {
1690 typedef void (*sa_handler_t)(int);
1691 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1692 }
1693
1694 void* os::signal(int signal_number, void* handler) {
1695 struct sigaction sigAct, oldSigAct;
1696
1697 sigfillset(&(sigAct.sa_mask));
1698
1699 // Do not block out synchronous signals in the signal handler.
1700 // Blocking synchronous signals only makes sense if you can really
1701 // be sure that those signals won't happen during signal handling,
1702 // when the blocking applies. Normal signal handlers are lean and
1703 // do not cause signals. But our signal handlers tend to be "risky"
1704 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1705 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1706 // by a SIGILL, which was blocked due to the signal mask. The process
1707 // just hung forever. Better to crash from a secondary signal than to hang.
1708 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1709 sigdelset(&(sigAct.sa_mask), SIGBUS);
1710 sigdelset(&(sigAct.sa_mask), SIGILL);
1711 sigdelset(&(sigAct.sa_mask), SIGFPE);
1712 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1713
1714 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1715
1716 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1717
1718 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1719 // -1 means registration failed
1720 return (void *)-1;
1721 }
1722
1723 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1724 }
1725
1726 void os::signal_raise(int signal_number) {
1727 ::raise(signal_number);
1728 }
1729
1730 //
1731 // The following code is moved from os.cpp for making this
1732 // code platform specific, which it is by its very nature.
1733 //
1734
1735 // Will be modified when max signal is changed to be dynamic
1736 int os::sigexitnum_pd() {
1737 return NSIG;
1738 }
1739
1740 // a counter for each possible signal value
1741 static volatile jint pending_signals[NSIG+1] = { 0 };
1742
1743 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1744 // On AIX, we use sem_init(), sem_post(), sem_wait()
1745 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1746 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1747 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1748 // on AIX, msem_..() calls are suspected of causing problems.
1749 static sem_t sig_sem;
1750 static msemaphore* p_sig_msem = 0;
1751
1752 static void local_sem_init() {
1753 if (os::Aix::on_aix()) {
1754 int rc = ::sem_init(&sig_sem, 0, 0);
1755 guarantee(rc != -1, "sem_init failed");
1756 } else {
1757 // Memory semaphores must live in shared mem.
1758 guarantee0(p_sig_msem == NULL);
1759 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1760 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1761 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1762 }
1763 }
1764
1765 static void local_sem_post() {
1766 static bool warn_only_once = false;
1767 if (os::Aix::on_aix()) {
1768 int rc = ::sem_post(&sig_sem);
1769 if (rc == -1 && !warn_only_once) {
1770 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1771 warn_only_once = true;
1772 }
1773 } else {
1774 guarantee0(p_sig_msem != NULL);
1775 int rc = ::msem_unlock(p_sig_msem, 0);
1776 if (rc == -1 && !warn_only_once) {
1777 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1778 warn_only_once = true;
1779 }
1780 }
1781 }
1782
1783 static void local_sem_wait() {
1784 static bool warn_only_once = false;
1785 if (os::Aix::on_aix()) {
1786 int rc = ::sem_wait(&sig_sem);
1787 if (rc == -1 && !warn_only_once) {
1788 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1789 warn_only_once = true;
1790 }
1791 } else {
1792 guarantee0(p_sig_msem != NULL); // must init before use
1793 int rc = ::msem_lock(p_sig_msem, 0);
1794 if (rc == -1 && !warn_only_once) {
1795 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1796 warn_only_once = true;
1797 }
1798 }
1799 }
1800
1801 static void jdk_misc_signal_init() {
1802 // Initialize signal structures
1803 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1804
1805 // Initialize signal semaphore
1806 local_sem_init();
1807 }
1808
1809 void os::signal_notify(int sig) {
1810 Atomic::inc(&pending_signals[sig]);
1811 local_sem_post();
1812 }
1813
1814 static int check_pending_signals() {
1815 Atomic::store(0, &sigint_count);
1816 for (;;) {
1817 for (int i = 0; i < NSIG + 1; i++) {
1818 jint n = pending_signals[i];
1819 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1820 return i;
1821 }
1822 }
1823 JavaThread *thread = JavaThread::current();
1824 ThreadBlockInVM tbivm(thread);
1825
1826 bool threadIsSuspended;
1827 do {
1828 thread->set_suspend_equivalent();
1829 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1830
1831 local_sem_wait();
1832
1833 // were we externally suspended while we were waiting?
1834 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1835 if (threadIsSuspended) {
1836 //
1837 // The semaphore has been incremented, but while we were waiting
1838 // another thread suspended us. We don't want to continue running
1839 // while suspended because that would surprise the thread that
1840 // suspended us.
1841 //
1842
1843 local_sem_post();
1844
1845 thread->java_suspend_self();
1846 }
1847 } while (threadIsSuspended);
1848 }
1849 }
1850
1851 int os::signal_wait() {
1852 return check_pending_signals();
1853 }
1854
1855 ////////////////////////////////////////////////////////////////////////////////
1856 // Virtual Memory
1857
1858 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1859
1860 #define VMEM_MAPPED 1
1861 #define VMEM_SHMATED 2
1862
1863 struct vmembk_t {
1864 int type; // 1 - mmap, 2 - shmat
1865 char* addr;
1866 size_t size; // Real size, may be larger than usersize.
1867 size_t pagesize; // page size of area
1868 vmembk_t* next;
1869
1870 bool contains_addr(char* p) const {
1871 return p >= addr && p < (addr + size);
1872 }
1873
1874 bool contains_range(char* p, size_t s) const {
1875 return contains_addr(p) && contains_addr(p + s - 1);
1876 }
1877
1878 void print_on(outputStream* os) const {
1879 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1880 " bytes, %d %s pages), %s",
1881 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1882 (type == VMEM_SHMATED ? "shmat" : "mmap")
1883 );
1884 }
1885
1886 // Check that range is a sub range of memory block (or equal to memory block);
1887 // also check that range is fully page aligned to the page size if the block.
1888 void assert_is_valid_subrange(char* p, size_t s) const {
1889 if (!contains_range(p, s)) {
1890 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1891 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1892 p, p + s, addr, addr + size);
1893 guarantee0(false);
1894 }
1895 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1896 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1897 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1898 guarantee0(false);
1899 }
1900 }
1901 };
1902
1903 static struct {
1904 vmembk_t* first;
1905 MiscUtils::CritSect cs;
1906 } vmem;
1907
1908 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1909 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1910 assert0(p);
1911 if (p) {
1912 MiscUtils::AutoCritSect lck(&vmem.cs);
1913 p->addr = addr; p->size = size;
1914 p->pagesize = pagesize;
1915 p->type = type;
1916 p->next = vmem.first;
1917 vmem.first = p;
1918 }
1919 }
1920
1921 static vmembk_t* vmembk_find(char* addr) {
1922 MiscUtils::AutoCritSect lck(&vmem.cs);
1923 for (vmembk_t* p = vmem.first; p; p = p->next) {
1924 if (p->addr <= addr && (p->addr + p->size) > addr) {
1925 return p;
1926 }
1927 }
1928 return NULL;
1929 }
1930
1931 static void vmembk_remove(vmembk_t* p0) {
1932 MiscUtils::AutoCritSect lck(&vmem.cs);
1933 assert0(p0);
1934 assert0(vmem.first); // List should not be empty.
1935 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1936 if (*pp == p0) {
1937 *pp = p0->next;
1938 ::free(p0);
1939 return;
1940 }
1941 }
1942 assert0(false); // Not found?
1943 }
1944
1945 static void vmembk_print_on(outputStream* os) {
1946 MiscUtils::AutoCritSect lck(&vmem.cs);
1947 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1948 vmi->print_on(os);
1949 os->cr();
1950 }
1951 }
1952
1953 // Reserve and attach a section of System V memory.
1954 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1955 // address. Failing that, it will attach the memory anywhere.
1956 // If <requested_addr> is NULL, function will attach the memory anywhere.
1957 //
1958 // <alignment_hint> is being ignored by this function. It is very probable however that the
1959 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1960 // Should this be not enogh, we can put more work into it.
1961 static char* reserve_shmated_memory (
1962 size_t bytes,
1963 char* requested_addr,
1964 size_t alignment_hint) {
1965
1966 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1967 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1968 bytes, requested_addr, alignment_hint);
1969
1970 // Either give me wish address or wish alignment but not both.
1971 assert0(!(requested_addr != NULL && alignment_hint != 0));
1972
1973 // We must prevent anyone from attaching too close to the
1974 // BRK because that may cause malloc OOM.
1975 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1976 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1977 "Will attach anywhere.", requested_addr);
1978 // Act like the OS refused to attach there.
1979 requested_addr = NULL;
1980 }
1981
1982 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1983 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1984 if (os::Aix::on_pase_V5R4_or_older()) {
1985 ShouldNotReachHere();
1986 }
1987
1988 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1989 const size_t size = align_up(bytes, 64*K);
1990
1991 // Reserve the shared segment.
1992 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1993 if (shmid == -1) {
1994 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1995 return NULL;
1996 }
1997
1998 // Important note:
1999 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2000 // We must right after attaching it remove it from the system. System V shm segments are global and
2001 // survive the process.
2002 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2003
2004 struct shmid_ds shmbuf;
2005 memset(&shmbuf, 0, sizeof(shmbuf));
2006 shmbuf.shm_pagesize = 64*K;
2007 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2008 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2009 size / (64*K), errno);
2010 // I want to know if this ever happens.
2011 assert(false, "failed to set page size for shmat");
2012 }
2013
2014 // Now attach the shared segment.
2015 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2016 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2017 // were not a segment boundary.
2018 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2019 const int errno_shmat = errno;
2020
2021 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2022 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2023 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2024 assert(false, "failed to remove shared memory segment!");
2025 }
2026
2027 // Handle shmat error. If we failed to attach, just return.
2028 if (addr == (char*)-1) {
2029 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2030 return NULL;
2031 }
2032
2033 // Just for info: query the real page size. In case setting the page size did not
2034 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2035 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2036 if (real_pagesize != shmbuf.shm_pagesize) {
2037 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2038 }
2039
2040 if (addr) {
2041 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2042 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2043 } else {
2044 if (requested_addr != NULL) {
2045 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2046 } else {
2047 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2048 }
2049 }
2050
2051 // book-keeping
2052 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2053 assert0(is_aligned_to(addr, os::vm_page_size()));
2054
2055 return addr;
2056 }
2057
2058 static bool release_shmated_memory(char* addr, size_t size) {
2059
2060 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2061 addr, addr + size - 1);
2062
2063 bool rc = false;
2064
2065 // TODO: is there a way to verify shm size without doing bookkeeping?
2066 if (::shmdt(addr) != 0) {
2067 trcVerbose("error (%d).", errno);
2068 } else {
2069 trcVerbose("ok.");
2070 rc = true;
2071 }
2072 return rc;
2073 }
2074
2075 static bool uncommit_shmated_memory(char* addr, size_t size) {
2076 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2077 addr, addr + size - 1);
2078
2079 const bool rc = my_disclaim64(addr, size);
2080
2081 if (!rc) {
2082 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2083 return false;
2084 }
2085 return true;
2086 }
2087
2088 //////////////////////////////// mmap-based routines /////////////////////////////////
2089
2090 // Reserve memory via mmap.
2091 // If <requested_addr> is given, an attempt is made to attach at the given address.
2092 // Failing that, memory is allocated at any address.
2093 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2094 // allocate at an address aligned with the given alignment. Failing that, memory
2095 // is aligned anywhere.
2096 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2097 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2098 "alignment_hint " UINTX_FORMAT "...",
2099 bytes, requested_addr, alignment_hint);
2100
2101 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2102 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2103 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2104 return NULL;
2105 }
2106
2107 // We must prevent anyone from attaching too close to the
2108 // BRK because that may cause malloc OOM.
2109 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2110 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2111 "Will attach anywhere.", requested_addr);
2112 // Act like the OS refused to attach there.
2113 requested_addr = NULL;
2114 }
2115
2116 // Specify one or the other but not both.
2117 assert0(!(requested_addr != NULL && alignment_hint > 0));
2118
2119 // In 64K mode, we claim the global page size (os::vm_page_size())
2120 // is 64K. This is one of the few points where that illusion may
2121 // break, because mmap() will always return memory aligned to 4K. So
2122 // we must ensure we only ever return memory aligned to 64k.
2123 if (alignment_hint) {
2124 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2125 } else {
2126 alignment_hint = os::vm_page_size();
2127 }
2128
2129 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2130 const size_t size = align_up(bytes, os::vm_page_size());
2131
2132 // alignment: Allocate memory large enough to include an aligned range of the right size and
2133 // cut off the leading and trailing waste pages.
2134 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2135 const size_t extra_size = size + alignment_hint;
2136
2137 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2138 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2139 int flags = MAP_ANONYMOUS | MAP_SHARED;
2140
2141 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2142 // it means if wishaddress is given but MAP_FIXED is not set.
2143 //
2144 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2145 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2146 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2147 // get clobbered.
2148 if (requested_addr != NULL) {
2149 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2150 flags |= MAP_FIXED;
2151 }
2152 }
2153
2154 char* addr = (char*)::mmap(requested_addr, extra_size,
2155 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2156
2157 if (addr == MAP_FAILED) {
2158 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2159 return NULL;
2160 }
2161
2162 // Handle alignment.
2163 char* const addr_aligned = align_up(addr, alignment_hint);
2164 const size_t waste_pre = addr_aligned - addr;
2165 char* const addr_aligned_end = addr_aligned + size;
2166 const size_t waste_post = extra_size - waste_pre - size;
2167 if (waste_pre > 0) {
2168 ::munmap(addr, waste_pre);
2169 }
2170 if (waste_post > 0) {
2171 ::munmap(addr_aligned_end, waste_post);
2172 }
2173 addr = addr_aligned;
2174
2175 if (addr) {
2176 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2177 addr, addr + bytes, bytes);
2178 } else {
2179 if (requested_addr != NULL) {
2180 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2181 } else {
2182 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2183 }
2184 }
2185
2186 // bookkeeping
2187 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2188
2189 // Test alignment, see above.
2190 assert0(is_aligned_to(addr, os::vm_page_size()));
2191
2192 return addr;
2193 }
2194
2195 static bool release_mmaped_memory(char* addr, size_t size) {
2196 assert0(is_aligned_to(addr, os::vm_page_size()));
2197 assert0(is_aligned_to(size, os::vm_page_size()));
2198
2199 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2200 addr, addr + size - 1);
2201 bool rc = false;
2202
2203 if (::munmap(addr, size) != 0) {
2204 trcVerbose("failed (%d)\n", errno);
2205 rc = false;
2206 } else {
2207 trcVerbose("ok.");
2208 rc = true;
2209 }
2210
2211 return rc;
2212 }
2213
2214 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2215
2216 assert0(is_aligned_to(addr, os::vm_page_size()));
2217 assert0(is_aligned_to(size, os::vm_page_size()));
2218
2219 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2220 addr, addr + size - 1);
2221 bool rc = false;
2222
2223 // Uncommit mmap memory with msync MS_INVALIDATE.
2224 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2225 trcVerbose("failed (%d)\n", errno);
2226 rc = false;
2227 } else {
2228 trcVerbose("ok.");
2229 rc = true;
2230 }
2231
2232 return rc;
2233 }
2234
2235 int os::vm_page_size() {
2236 // Seems redundant as all get out.
2237 assert(os::Aix::page_size() != -1, "must call os::init");
2238 return os::Aix::page_size();
2239 }
2240
2241 // Aix allocates memory by pages.
2242 int os::vm_allocation_granularity() {
2243 assert(os::Aix::page_size() != -1, "must call os::init");
2244 return os::Aix::page_size();
2245 }
2246
2247 #ifdef PRODUCT
2248 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2249 int err) {
2250 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2251 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2252 os::errno_name(err), err);
2253 }
2254 #endif
2255
2256 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2257 const char* mesg) {
2258 assert(mesg != NULL, "mesg must be specified");
2259 if (!pd_commit_memory(addr, size, exec)) {
2260 // Add extra info in product mode for vm_exit_out_of_memory():
2261 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2262 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2263 }
2264 }
2265
2266 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2267
2268 assert(is_aligned_to(addr, os::vm_page_size()),
2269 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2270 p2i(addr), os::vm_page_size());
2271 assert(is_aligned_to(size, os::vm_page_size()),
2272 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2273 size, os::vm_page_size());
2274
2275 vmembk_t* const vmi = vmembk_find(addr);
2276 guarantee0(vmi);
2277 vmi->assert_is_valid_subrange(addr, size);
2278
2279 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2280
2281 if (UseExplicitCommit) {
2282 // AIX commits memory on touch. So, touch all pages to be committed.
2283 for (char* p = addr; p < (addr + size); p += 4*K) {
2284 *p = '\0';
2285 }
2286 }
2287
2288 return true;
2289 }
2290
2291 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2292 return pd_commit_memory(addr, size, exec);
2293 }
2294
2295 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2296 size_t alignment_hint, bool exec,
2297 const char* mesg) {
2298 // Alignment_hint is ignored on this OS.
2299 pd_commit_memory_or_exit(addr, size, exec, mesg);
2300 }
2301
2302 bool os::pd_uncommit_memory(char* addr, size_t size) {
2303 assert(is_aligned_to(addr, os::vm_page_size()),
2304 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2305 p2i(addr), os::vm_page_size());
2306 assert(is_aligned_to(size, os::vm_page_size()),
2307 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2308 size, os::vm_page_size());
2309
2310 // Dynamically do different things for mmap/shmat.
2311 const vmembk_t* const vmi = vmembk_find(addr);
2312 guarantee0(vmi);
2313 vmi->assert_is_valid_subrange(addr, size);
2314
2315 if (vmi->type == VMEM_SHMATED) {
2316 return uncommit_shmated_memory(addr, size);
2317 } else {
2318 return uncommit_mmaped_memory(addr, size);
2319 }
2320 }
2321
2322 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2323 // Do not call this; no need to commit stack pages on AIX.
2324 ShouldNotReachHere();
2325 return true;
2326 }
2327
2328 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2329 // Do not call this; no need to commit stack pages on AIX.
2330 ShouldNotReachHere();
2331 return true;
2332 }
2333
2334 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2335 }
2336
2337 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2338 }
2339
2340 void os::numa_make_global(char *addr, size_t bytes) {
2341 }
2342
2343 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2344 }
2345
2346 bool os::numa_topology_changed() {
2347 return false;
2348 }
2349
2350 size_t os::numa_get_groups_num() {
2351 return 1;
2352 }
2353
2354 int os::numa_get_group_id() {
2355 return 0;
2356 }
2357
2358 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2359 if (size > 0) {
2360 ids[0] = 0;
2361 return 1;
2362 }
2363 return 0;
2364 }
2365
2366 bool os::get_page_info(char *start, page_info* info) {
2367 return false;
2368 }
2369
2370 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2371 return end;
2372 }
2373
2374 // Reserves and attaches a shared memory segment.
2375 // Will assert if a wish address is given and could not be obtained.
2376 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2377
2378 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2379 // thereby clobbering old mappings at that place. That is probably
2380 // not intended, never used and almost certainly an error were it
2381 // ever be used this way (to try attaching at a specified address
2382 // without clobbering old mappings an alternate API exists,
2383 // os::attempt_reserve_memory_at()).
2384 // Instead of mimicking the dangerous coding of the other platforms, here I
2385 // just ignore the request address (release) or assert(debug).
2386 assert0(requested_addr == NULL);
2387
2388 // Always round to os::vm_page_size(), which may be larger than 4K.
2389 bytes = align_up(bytes, os::vm_page_size());
2390 const size_t alignment_hint0 =
2391 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2392
2393 // In 4K mode always use mmap.
2394 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2395 if (os::vm_page_size() == 4*K) {
2396 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2397 } else {
2398 if (bytes >= Use64KPagesThreshold) {
2399 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2400 } else {
2401 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2402 }
2403 }
2404 }
2405
2406 bool os::pd_release_memory(char* addr, size_t size) {
2407
2408 // Dynamically do different things for mmap/shmat.
2409 vmembk_t* const vmi = vmembk_find(addr);
2410 guarantee0(vmi);
2411
2412 // Always round to os::vm_page_size(), which may be larger than 4K.
2413 size = align_up(size, os::vm_page_size());
2414 addr = align_up(addr, os::vm_page_size());
2415
2416 bool rc = false;
2417 bool remove_bookkeeping = false;
2418 if (vmi->type == VMEM_SHMATED) {
2419 // For shmatted memory, we do:
2420 // - If user wants to release the whole range, release the memory (shmdt).
2421 // - If user only wants to release a partial range, uncommit (disclaim) that
2422 // range. That way, at least, we do not use memory anymore (bust still page
2423 // table space).
2424 vmi->assert_is_valid_subrange(addr, size);
2425 if (addr == vmi->addr && size == vmi->size) {
2426 rc = release_shmated_memory(addr, size);
2427 remove_bookkeeping = true;
2428 } else {
2429 rc = uncommit_shmated_memory(addr, size);
2430 }
2431 } else {
2432 // User may unmap partial regions but region has to be fully contained.
2433 #ifdef ASSERT
2434 vmi->assert_is_valid_subrange(addr, size);
2435 #endif
2436 rc = release_mmaped_memory(addr, size);
2437 remove_bookkeeping = true;
2438 }
2439
2440 // update bookkeeping
2441 if (rc && remove_bookkeeping) {
2442 vmembk_remove(vmi);
2443 }
2444
2445 return rc;
2446 }
2447
2448 static bool checked_mprotect(char* addr, size_t size, int prot) {
2449
2450 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2451 // not tell me if protection failed when trying to protect an un-protectable range.
2452 //
2453 // This means if the memory was allocated using shmget/shmat, protection wont work
2454 // but mprotect will still return 0:
2455 //
2456 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2457
2458 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2459
2460 if (!rc) {
2461 const char* const s_errno = os::errno_name(errno);
2462 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2463 return false;
2464 }
2465
2466 // mprotect success check
2467 //
2468 // Mprotect said it changed the protection but can I believe it?
2469 //
2470 // To be sure I need to check the protection afterwards. Try to
2471 // read from protected memory and check whether that causes a segfault.
2472 //
2473 if (!os::Aix::xpg_sus_mode()) {
2474
2475 if (CanUseSafeFetch32()) {
2476
2477 const bool read_protected =
2478 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2479 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2480
2481 if (prot & PROT_READ) {
2482 rc = !read_protected;
2483 } else {
2484 rc = read_protected;
2485 }
2486
2487 if (!rc) {
2488 if (os::Aix::on_pase()) {
2489 // There is an issue on older PASE systems where mprotect() will return success but the
2490 // memory will not be protected.
2491 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2492 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2493 // a stack. It is an OS error.
2494 //
2495 // A valid strategy is just to try again. This usually works. :-/
2496
2497 ::usleep(1000);
2498 if (::mprotect(addr, size, prot) == 0) {
2499 const bool read_protected_2 =
2500 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2501 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2502 rc = true;
2503 }
2504 }
2505 }
2506 }
2507 }
2508
2509 assert(rc == true, "mprotect failed.");
2510
2511 return rc;
2512 }
2513
2514 // Set protections specified
2515 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2516 unsigned int p = 0;
2517 switch (prot) {
2518 case MEM_PROT_NONE: p = PROT_NONE; break;
2519 case MEM_PROT_READ: p = PROT_READ; break;
2520 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2521 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2522 default:
2523 ShouldNotReachHere();
2524 }
2525 // is_committed is unused.
2526 return checked_mprotect(addr, size, p);
2527 }
2528
2529 bool os::guard_memory(char* addr, size_t size) {
2530 return checked_mprotect(addr, size, PROT_NONE);
2531 }
2532
2533 bool os::unguard_memory(char* addr, size_t size) {
2534 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2535 }
2536
2537 // Large page support
2538
2539 static size_t _large_page_size = 0;
2540
2541 // Enable large page support if OS allows that.
2542 void os::large_page_init() {
2543 return; // Nothing to do. See query_multipage_support and friends.
2544 }
2545
2546 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2547 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2548 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2549 // so this is not needed.
2550 assert(false, "should not be called on AIX");
2551 return NULL;
2552 }
2553
2554 bool os::release_memory_special(char* base, size_t bytes) {
2555 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2556 Unimplemented();
2557 return false;
2558 }
2559
2560 size_t os::large_page_size() {
2561 return _large_page_size;
2562 }
2563
2564 bool os::can_commit_large_page_memory() {
2565 // Does not matter, we do not support huge pages.
2566 return false;
2567 }
2568
2569 bool os::can_execute_large_page_memory() {
2570 // Does not matter, we do not support huge pages.
2571 return false;
2572 }
2573
2574 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2575 assert(file_desc >= 0, "file_desc is not valid");
2576 char* result = NULL;
2577
2578 // Always round to os::vm_page_size(), which may be larger than 4K.
2579 bytes = align_up(bytes, os::vm_page_size());
2580 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2581
2582 if (result != NULL) {
2583 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2584 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2585 }
2586 }
2587 return result;
2588 }
2589
2590 // Reserve memory at an arbitrary address, only if that area is
2591 // available (and not reserved for something else).
2592 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2593 char* addr = NULL;
2594
2595 // Always round to os::vm_page_size(), which may be larger than 4K.
2596 bytes = align_up(bytes, os::vm_page_size());
2597
2598 // In 4K mode always use mmap.
2599 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2600 if (os::vm_page_size() == 4*K) {
2601 return reserve_mmaped_memory(bytes, requested_addr, 0);
2602 } else {
2603 if (bytes >= Use64KPagesThreshold) {
2604 return reserve_shmated_memory(bytes, requested_addr, 0);
2605 } else {
2606 return reserve_mmaped_memory(bytes, requested_addr, 0);
2607 }
2608 }
2609
2610 return addr;
2611 }
2612
2613 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2614 return ::read(fd, buf, nBytes);
2615 }
2616
2617 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2618 return ::pread(fd, buf, nBytes, offset);
2619 }
2620
2621 void os::naked_short_sleep(jlong ms) {
2622 struct timespec req;
2623
2624 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2625 req.tv_sec = 0;
2626 if (ms > 0) {
2627 req.tv_nsec = (ms % 1000) * 1000000;
2628 }
2629 else {
2630 req.tv_nsec = 1;
2631 }
2632
2633 nanosleep(&req, NULL);
2634
2635 return;
2636 }
2637
2638 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2639 void os::infinite_sleep() {
2640 while (true) { // sleep forever ...
2641 ::sleep(100); // ... 100 seconds at a time
2642 }
2643 }
2644
2645 // Used to convert frequent JVM_Yield() to nops
2646 bool os::dont_yield() {
2647 return DontYieldALot;
2648 }
2649
2650 void os::naked_yield() {
2651 sched_yield();
2652 }
2653
2654 ////////////////////////////////////////////////////////////////////////////////
2655 // thread priority support
2656
2657 // From AIX manpage to pthread_setschedparam
2658 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2659 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2660 //
2661 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2662 // range from 40 to 80, where 40 is the least favored priority and 80
2663 // is the most favored."
2664 //
2665 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2666 // scheduling there; however, this still leaves iSeries.)
2667 //
2668 // We use the same values for AIX and PASE.
2669 int os::java_to_os_priority[CriticalPriority + 1] = {
2670 54, // 0 Entry should never be used
2671
2672 55, // 1 MinPriority
2673 55, // 2
2674 56, // 3
2675
2676 56, // 4
2677 57, // 5 NormPriority
2678 57, // 6
2679
2680 58, // 7
2681 58, // 8
2682 59, // 9 NearMaxPriority
2683
2684 60, // 10 MaxPriority
2685
2686 60 // 11 CriticalPriority
2687 };
2688
2689 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2690 if (!UseThreadPriorities) return OS_OK;
2691 pthread_t thr = thread->osthread()->pthread_id();
2692 int policy = SCHED_OTHER;
2693 struct sched_param param;
2694 param.sched_priority = newpri;
2695 int ret = pthread_setschedparam(thr, policy, ¶m);
2696
2697 if (ret != 0) {
2698 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2699 (int)thr, newpri, ret, os::errno_name(ret));
2700 }
2701 return (ret == 0) ? OS_OK : OS_ERR;
2702 }
2703
2704 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2705 if (!UseThreadPriorities) {
2706 *priority_ptr = java_to_os_priority[NormPriority];
2707 return OS_OK;
2708 }
2709 pthread_t thr = thread->osthread()->pthread_id();
2710 int policy = SCHED_OTHER;
2711 struct sched_param param;
2712 int ret = pthread_getschedparam(thr, &policy, ¶m);
2713 *priority_ptr = param.sched_priority;
2714
2715 return (ret == 0) ? OS_OK : OS_ERR;
2716 }
2717
2718 // Hint to the underlying OS that a task switch would not be good.
2719 // Void return because it's a hint and can fail.
2720 void os::hint_no_preempt() {}
2721
2722 ////////////////////////////////////////////////////////////////////////////////
2723 // suspend/resume support
2724
2725 // The low-level signal-based suspend/resume support is a remnant from the
2726 // old VM-suspension that used to be for java-suspension, safepoints etc,
2727 // within hotspot. Currently used by JFR's OSThreadSampler
2728 //
2729 // The remaining code is greatly simplified from the more general suspension
2730 // code that used to be used.
2731 //
2732 // The protocol is quite simple:
2733 // - suspend:
2734 // - sends a signal to the target thread
2735 // - polls the suspend state of the osthread using a yield loop
2736 // - target thread signal handler (SR_handler) sets suspend state
2737 // and blocks in sigsuspend until continued
2738 // - resume:
2739 // - sets target osthread state to continue
2740 // - sends signal to end the sigsuspend loop in the SR_handler
2741 //
2742 // Note that the SR_lock plays no role in this suspend/resume protocol,
2743 // but is checked for NULL in SR_handler as a thread termination indicator.
2744 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2745 //
2746 // Note that resume_clear_context() and suspend_save_context() are needed
2747 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2748 // which in part is used by:
2749 // - Forte Analyzer: AsyncGetCallTrace()
2750 // - StackBanging: get_frame_at_stack_banging_point()
2751
2752 static void resume_clear_context(OSThread *osthread) {
2753 osthread->set_ucontext(NULL);
2754 osthread->set_siginfo(NULL);
2755 }
2756
2757 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2758 osthread->set_ucontext(context);
2759 osthread->set_siginfo(siginfo);
2760 }
2761
2762 //
2763 // Handler function invoked when a thread's execution is suspended or
2764 // resumed. We have to be careful that only async-safe functions are
2765 // called here (Note: most pthread functions are not async safe and
2766 // should be avoided.)
2767 //
2768 // Note: sigwait() is a more natural fit than sigsuspend() from an
2769 // interface point of view, but sigwait() prevents the signal hander
2770 // from being run. libpthread would get very confused by not having
2771 // its signal handlers run and prevents sigwait()'s use with the
2772 // mutex granting granting signal.
2773 //
2774 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2775 //
2776 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2777 // Save and restore errno to avoid confusing native code with EINTR
2778 // after sigsuspend.
2779 int old_errno = errno;
2780
2781 Thread* thread = Thread::current_or_null_safe();
2782 assert(thread != NULL, "Missing current thread in SR_handler");
2783
2784 // On some systems we have seen signal delivery get "stuck" until the signal
2785 // mask is changed as part of thread termination. Check that the current thread
2786 // has not already terminated (via SR_lock()) - else the following assertion
2787 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2788 // destructor has completed.
2789
2790 if (thread->SR_lock() == NULL) {
2791 return;
2792 }
2793
2794 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2795
2796 OSThread* osthread = thread->osthread();
2797
2798 os::SuspendResume::State current = osthread->sr.state();
2799 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2800 suspend_save_context(osthread, siginfo, context);
2801
2802 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2803 os::SuspendResume::State state = osthread->sr.suspended();
2804 if (state == os::SuspendResume::SR_SUSPENDED) {
2805 sigset_t suspend_set; // signals for sigsuspend()
2806
2807 // get current set of blocked signals and unblock resume signal
2808 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2809 sigdelset(&suspend_set, SR_signum);
2810
2811 // wait here until we are resumed
2812 while (1) {
2813 sigsuspend(&suspend_set);
2814
2815 os::SuspendResume::State result = osthread->sr.running();
2816 if (result == os::SuspendResume::SR_RUNNING) {
2817 break;
2818 }
2819 }
2820
2821 } else if (state == os::SuspendResume::SR_RUNNING) {
2822 // request was cancelled, continue
2823 } else {
2824 ShouldNotReachHere();
2825 }
2826
2827 resume_clear_context(osthread);
2828 } else if (current == os::SuspendResume::SR_RUNNING) {
2829 // request was cancelled, continue
2830 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2831 // ignore
2832 } else {
2833 ShouldNotReachHere();
2834 }
2835
2836 errno = old_errno;
2837 }
2838
2839 static int SR_initialize() {
2840 struct sigaction act;
2841 char *s;
2842 // Get signal number to use for suspend/resume
2843 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2844 int sig = ::strtol(s, 0, 10);
2845 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2846 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2847 SR_signum = sig;
2848 } else {
2849 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2850 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2851 }
2852 }
2853
2854 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2855 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2856
2857 sigemptyset(&SR_sigset);
2858 sigaddset(&SR_sigset, SR_signum);
2859
2860 // Set up signal handler for suspend/resume.
2861 act.sa_flags = SA_RESTART|SA_SIGINFO;
2862 act.sa_handler = (void (*)(int)) SR_handler;
2863
2864 // SR_signum is blocked by default.
2865 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2866
2867 if (sigaction(SR_signum, &act, 0) == -1) {
2868 return -1;
2869 }
2870
2871 // Save signal flag
2872 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2873 return 0;
2874 }
2875
2876 static int SR_finalize() {
2877 return 0;
2878 }
2879
2880 static int sr_notify(OSThread* osthread) {
2881 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2882 assert_status(status == 0, status, "pthread_kill");
2883 return status;
2884 }
2885
2886 // "Randomly" selected value for how long we want to spin
2887 // before bailing out on suspending a thread, also how often
2888 // we send a signal to a thread we want to resume
2889 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2890 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2891
2892 // returns true on success and false on error - really an error is fatal
2893 // but this seems the normal response to library errors
2894 static bool do_suspend(OSThread* osthread) {
2895 assert(osthread->sr.is_running(), "thread should be running");
2896 // mark as suspended and send signal
2897
2898 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2899 // failed to switch, state wasn't running?
2900 ShouldNotReachHere();
2901 return false;
2902 }
2903
2904 if (sr_notify(osthread) != 0) {
2905 // try to cancel, switch to running
2906
2907 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2908 if (result == os::SuspendResume::SR_RUNNING) {
2909 // cancelled
2910 return false;
2911 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2912 // somehow managed to suspend
2913 return true;
2914 } else {
2915 ShouldNotReachHere();
2916 return false;
2917 }
2918 }
2919
2920 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2921
2922 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2923 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2924 os::naked_yield();
2925 }
2926
2927 // timeout, try to cancel the request
2928 if (n >= RANDOMLY_LARGE_INTEGER) {
2929 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2930 if (cancelled == os::SuspendResume::SR_RUNNING) {
2931 return false;
2932 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2933 return true;
2934 } else {
2935 ShouldNotReachHere();
2936 return false;
2937 }
2938 }
2939 }
2940
2941 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2942 return true;
2943 }
2944
2945 static void do_resume(OSThread* osthread) {
2946 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2947
2948 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2949 // failed to switch to WAKEUP_REQUEST
2950 ShouldNotReachHere();
2951 return;
2952 }
2953
2954 while (!osthread->sr.is_running()) {
2955 if (sr_notify(osthread) == 0) {
2956 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2957 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2958 os::naked_yield();
2959 }
2960 }
2961 } else {
2962 ShouldNotReachHere();
2963 }
2964 }
2965
2966 guarantee(osthread->sr.is_running(), "Must be running!");
2967 }
2968
2969 ///////////////////////////////////////////////////////////////////////////////////
2970 // signal handling (except suspend/resume)
2971
2972 // This routine may be used by user applications as a "hook" to catch signals.
2973 // The user-defined signal handler must pass unrecognized signals to this
2974 // routine, and if it returns true (non-zero), then the signal handler must
2975 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2976 // routine will never retun false (zero), but instead will execute a VM panic
2977 // routine kill the process.
2978 //
2979 // If this routine returns false, it is OK to call it again. This allows
2980 // the user-defined signal handler to perform checks either before or after
2981 // the VM performs its own checks. Naturally, the user code would be making
2982 // a serious error if it tried to handle an exception (such as a null check
2983 // or breakpoint) that the VM was generating for its own correct operation.
2984 //
2985 // This routine may recognize any of the following kinds of signals:
2986 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2987 // It should be consulted by handlers for any of those signals.
2988 //
2989 // The caller of this routine must pass in the three arguments supplied
2990 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2991 // field of the structure passed to sigaction(). This routine assumes that
2992 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2993 //
2994 // Note that the VM will print warnings if it detects conflicting signal
2995 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2996 //
2997 extern "C" JNIEXPORT int
2998 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2999
3000 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3001 // to be the thing to call; documentation is not terribly clear about whether
3002 // pthread_sigmask also works, and if it does, whether it does the same.
3003 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3004 const int rc = ::pthread_sigmask(how, set, oset);
3005 // return value semantics differ slightly for error case:
3006 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3007 // (so, pthread_sigmask is more theadsafe for error handling)
3008 // But success is always 0.
3009 return rc == 0 ? true : false;
3010 }
3011
3012 // Function to unblock all signals which are, according
3013 // to POSIX, typical program error signals. If they happen while being blocked,
3014 // they typically will bring down the process immediately.
3015 bool unblock_program_error_signals() {
3016 sigset_t set;
3017 ::sigemptyset(&set);
3018 ::sigaddset(&set, SIGILL);
3019 ::sigaddset(&set, SIGBUS);
3020 ::sigaddset(&set, SIGFPE);
3021 ::sigaddset(&set, SIGSEGV);
3022 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3023 }
3024
3025 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3026 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3027 assert(info != NULL && uc != NULL, "it must be old kernel");
3028
3029 // Never leave program error signals blocked;
3030 // on all our platforms they would bring down the process immediately when
3031 // getting raised while being blocked.
3032 unblock_program_error_signals();
3033
3034 int orig_errno = errno; // Preserve errno value over signal handler.
3035 JVM_handle_aix_signal(sig, info, uc, true);
3036 errno = orig_errno;
3037 }
3038
3039 // This boolean allows users to forward their own non-matching signals
3040 // to JVM_handle_aix_signal, harmlessly.
3041 bool os::Aix::signal_handlers_are_installed = false;
3042
3043 // For signal-chaining
3044 struct sigaction sigact[NSIG];
3045 sigset_t sigs;
3046 bool os::Aix::libjsig_is_loaded = false;
3047 typedef struct sigaction *(*get_signal_t)(int);
3048 get_signal_t os::Aix::get_signal_action = NULL;
3049
3050 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3051 struct sigaction *actp = NULL;
3052
3053 if (libjsig_is_loaded) {
3054 // Retrieve the old signal handler from libjsig
3055 actp = (*get_signal_action)(sig);
3056 }
3057 if (actp == NULL) {
3058 // Retrieve the preinstalled signal handler from jvm
3059 actp = get_preinstalled_handler(sig);
3060 }
3061
3062 return actp;
3063 }
3064
3065 static bool call_chained_handler(struct sigaction *actp, int sig,
3066 siginfo_t *siginfo, void *context) {
3067 // Call the old signal handler
3068 if (actp->sa_handler == SIG_DFL) {
3069 // It's more reasonable to let jvm treat it as an unexpected exception
3070 // instead of taking the default action.
3071 return false;
3072 } else if (actp->sa_handler != SIG_IGN) {
3073 if ((actp->sa_flags & SA_NODEFER) == 0) {
3074 // automaticlly block the signal
3075 sigaddset(&(actp->sa_mask), sig);
3076 }
3077
3078 sa_handler_t hand = NULL;
3079 sa_sigaction_t sa = NULL;
3080 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3081 // retrieve the chained handler
3082 if (siginfo_flag_set) {
3083 sa = actp->sa_sigaction;
3084 } else {
3085 hand = actp->sa_handler;
3086 }
3087
3088 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3089 actp->sa_handler = SIG_DFL;
3090 }
3091
3092 // try to honor the signal mask
3093 sigset_t oset;
3094 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3095
3096 // call into the chained handler
3097 if (siginfo_flag_set) {
3098 (*sa)(sig, siginfo, context);
3099 } else {
3100 (*hand)(sig);
3101 }
3102
3103 // restore the signal mask
3104 pthread_sigmask(SIG_SETMASK, &oset, 0);
3105 }
3106 // Tell jvm's signal handler the signal is taken care of.
3107 return true;
3108 }
3109
3110 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3111 bool chained = false;
3112 // signal-chaining
3113 if (UseSignalChaining) {
3114 struct sigaction *actp = get_chained_signal_action(sig);
3115 if (actp != NULL) {
3116 chained = call_chained_handler(actp, sig, siginfo, context);
3117 }
3118 }
3119 return chained;
3120 }
3121
3122 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3123 if (sigismember(&sigs, sig)) {
3124 return &sigact[sig];
3125 }
3126 return NULL;
3127 }
3128
3129 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3130 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3131 sigact[sig] = oldAct;
3132 sigaddset(&sigs, sig);
3133 }
3134
3135 // for diagnostic
3136 int sigflags[NSIG];
3137
3138 int os::Aix::get_our_sigflags(int sig) {
3139 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3140 return sigflags[sig];
3141 }
3142
3143 void os::Aix::set_our_sigflags(int sig, int flags) {
3144 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3145 if (sig > 0 && sig < NSIG) {
3146 sigflags[sig] = flags;
3147 }
3148 }
3149
3150 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3151 // Check for overwrite.
3152 struct sigaction oldAct;
3153 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3154
3155 void* oldhand = oldAct.sa_sigaction
3156 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3157 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3158 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3159 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3160 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3161 if (AllowUserSignalHandlers || !set_installed) {
3162 // Do not overwrite; user takes responsibility to forward to us.
3163 return;
3164 } else if (UseSignalChaining) {
3165 // save the old handler in jvm
3166 save_preinstalled_handler(sig, oldAct);
3167 // libjsig also interposes the sigaction() call below and saves the
3168 // old sigaction on it own.
3169 } else {
3170 fatal("Encountered unexpected pre-existing sigaction handler "
3171 "%#lx for signal %d.", (long)oldhand, sig);
3172 }
3173 }
3174
3175 struct sigaction sigAct;
3176 sigfillset(&(sigAct.sa_mask));
3177 if (!set_installed) {
3178 sigAct.sa_handler = SIG_DFL;
3179 sigAct.sa_flags = SA_RESTART;
3180 } else {
3181 sigAct.sa_sigaction = javaSignalHandler;
3182 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3183 }
3184 // Save flags, which are set by ours
3185 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3186 sigflags[sig] = sigAct.sa_flags;
3187
3188 int ret = sigaction(sig, &sigAct, &oldAct);
3189 assert(ret == 0, "check");
3190
3191 void* oldhand2 = oldAct.sa_sigaction
3192 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3193 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3194 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3195 }
3196
3197 // install signal handlers for signals that HotSpot needs to
3198 // handle in order to support Java-level exception handling.
3199 void os::Aix::install_signal_handlers() {
3200 if (!signal_handlers_are_installed) {
3201 signal_handlers_are_installed = true;
3202
3203 // signal-chaining
3204 typedef void (*signal_setting_t)();
3205 signal_setting_t begin_signal_setting = NULL;
3206 signal_setting_t end_signal_setting = NULL;
3207 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3208 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3209 if (begin_signal_setting != NULL) {
3210 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3211 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3212 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3213 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3214 libjsig_is_loaded = true;
3215 assert(UseSignalChaining, "should enable signal-chaining");
3216 }
3217 if (libjsig_is_loaded) {
3218 // Tell libjsig jvm is setting signal handlers.
3219 (*begin_signal_setting)();
3220 }
3221
3222 ::sigemptyset(&sigs);
3223 set_signal_handler(SIGSEGV, true);
3224 set_signal_handler(SIGPIPE, true);
3225 set_signal_handler(SIGBUS, true);
3226 set_signal_handler(SIGILL, true);
3227 set_signal_handler(SIGFPE, true);
3228 set_signal_handler(SIGTRAP, true);
3229 set_signal_handler(SIGXFSZ, true);
3230
3231 if (libjsig_is_loaded) {
3232 // Tell libjsig jvm finishes setting signal handlers.
3233 (*end_signal_setting)();
3234 }
3235
3236 // We don't activate signal checker if libjsig is in place, we trust ourselves
3237 // and if UserSignalHandler is installed all bets are off.
3238 // Log that signal checking is off only if -verbose:jni is specified.
3239 if (CheckJNICalls) {
3240 if (libjsig_is_loaded) {
3241 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3242 check_signals = false;
3243 }
3244 if (AllowUserSignalHandlers) {
3245 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3246 check_signals = false;
3247 }
3248 // Need to initialize check_signal_done.
3249 ::sigemptyset(&check_signal_done);
3250 }
3251 }
3252 }
3253
3254 static const char* get_signal_handler_name(address handler,
3255 char* buf, int buflen) {
3256 int offset;
3257 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3258 if (found) {
3259 // skip directory names
3260 const char *p1, *p2;
3261 p1 = buf;
3262 size_t len = strlen(os::file_separator());
3263 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3264 // The way os::dll_address_to_library_name is implemented on Aix
3265 // right now, it always returns -1 for the offset which is not
3266 // terribly informative.
3267 // Will fix that. For now, omit the offset.
3268 jio_snprintf(buf, buflen, "%s", p1);
3269 } else {
3270 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3271 }
3272 return buf;
3273 }
3274
3275 static void print_signal_handler(outputStream* st, int sig,
3276 char* buf, size_t buflen) {
3277 struct sigaction sa;
3278 sigaction(sig, NULL, &sa);
3279
3280 st->print("%s: ", os::exception_name(sig, buf, buflen));
3281
3282 address handler = (sa.sa_flags & SA_SIGINFO)
3283 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3284 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3285
3286 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3287 st->print("SIG_DFL");
3288 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3289 st->print("SIG_IGN");
3290 } else {
3291 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3292 }
3293
3294 // Print readable mask.
3295 st->print(", sa_mask[0]=");
3296 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3297
3298 address rh = VMError::get_resetted_sighandler(sig);
3299 // May be, handler was resetted by VMError?
3300 if (rh != NULL) {
3301 handler = rh;
3302 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3303 }
3304
3305 // Print textual representation of sa_flags.
3306 st->print(", sa_flags=");
3307 os::Posix::print_sa_flags(st, sa.sa_flags);
3308
3309 // Check: is it our handler?
3310 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3311 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3312 // It is our signal handler.
3313 // Check for flags, reset system-used one!
3314 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3315 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3316 os::Aix::get_our_sigflags(sig));
3317 }
3318 }
3319 st->cr();
3320 }
3321
3322 #define DO_SIGNAL_CHECK(sig) \
3323 if (!sigismember(&check_signal_done, sig)) \
3324 os::Aix::check_signal_handler(sig)
3325
3326 // This method is a periodic task to check for misbehaving JNI applications
3327 // under CheckJNI, we can add any periodic checks here
3328
3329 void os::run_periodic_checks() {
3330
3331 if (check_signals == false) return;
3332
3333 // SEGV and BUS if overridden could potentially prevent
3334 // generation of hs*.log in the event of a crash, debugging
3335 // such a case can be very challenging, so we absolutely
3336 // check the following for a good measure:
3337 DO_SIGNAL_CHECK(SIGSEGV);
3338 DO_SIGNAL_CHECK(SIGILL);
3339 DO_SIGNAL_CHECK(SIGFPE);
3340 DO_SIGNAL_CHECK(SIGBUS);
3341 DO_SIGNAL_CHECK(SIGPIPE);
3342 DO_SIGNAL_CHECK(SIGXFSZ);
3343 if (UseSIGTRAP) {
3344 DO_SIGNAL_CHECK(SIGTRAP);
3345 }
3346
3347 // ReduceSignalUsage allows the user to override these handlers
3348 // see comments at the very top and jvm_md.h
3349 if (!ReduceSignalUsage) {
3350 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3351 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3352 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3353 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3354 }
3355
3356 DO_SIGNAL_CHECK(SR_signum);
3357 }
3358
3359 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3360
3361 static os_sigaction_t os_sigaction = NULL;
3362
3363 void os::Aix::check_signal_handler(int sig) {
3364 char buf[O_BUFLEN];
3365 address jvmHandler = NULL;
3366
3367 struct sigaction act;
3368 if (os_sigaction == NULL) {
3369 // only trust the default sigaction, in case it has been interposed
3370 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3371 if (os_sigaction == NULL) return;
3372 }
3373
3374 os_sigaction(sig, (struct sigaction*)NULL, &act);
3375
3376 address thisHandler = (act.sa_flags & SA_SIGINFO)
3377 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3378 : CAST_FROM_FN_PTR(address, act.sa_handler);
3379
3380 switch(sig) {
3381 case SIGSEGV:
3382 case SIGBUS:
3383 case SIGFPE:
3384 case SIGPIPE:
3385 case SIGILL:
3386 case SIGXFSZ:
3387 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3388 break;
3389
3390 case SHUTDOWN1_SIGNAL:
3391 case SHUTDOWN2_SIGNAL:
3392 case SHUTDOWN3_SIGNAL:
3393 case BREAK_SIGNAL:
3394 jvmHandler = (address)user_handler();
3395 break;
3396
3397 default:
3398 if (sig == SR_signum) {
3399 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3400 } else {
3401 return;
3402 }
3403 break;
3404 }
3405
3406 if (thisHandler != jvmHandler) {
3407 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3408 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3409 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3410 // No need to check this sig any longer
3411 sigaddset(&check_signal_done, sig);
3412 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3413 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3414 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3415 exception_name(sig, buf, O_BUFLEN));
3416 }
3417 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3418 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3419 tty->print("expected:");
3420 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3421 tty->cr();
3422 tty->print(" found:");
3423 os::Posix::print_sa_flags(tty, act.sa_flags);
3424 tty->cr();
3425 // No need to check this sig any longer
3426 sigaddset(&check_signal_done, sig);
3427 }
3428
3429 // Dump all the signal
3430 if (sigismember(&check_signal_done, sig)) {
3431 print_signal_handlers(tty, buf, O_BUFLEN);
3432 }
3433 }
3434
3435 // To install functions for atexit system call
3436 extern "C" {
3437 static void perfMemory_exit_helper() {
3438 perfMemory_exit();
3439 }
3440 }
3441
3442 // This is called _before_ the most of global arguments have been parsed.
3443 void os::init(void) {
3444 // This is basic, we want to know if that ever changes.
3445 // (Shared memory boundary is supposed to be a 256M aligned.)
3446 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3447
3448 // Record process break at startup.
3449 g_brk_at_startup = (address) ::sbrk(0);
3450 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3451
3452 // First off, we need to know whether we run on AIX or PASE, and
3453 // the OS level we run on.
3454 os::Aix::initialize_os_info();
3455
3456 // Scan environment (SPEC1170 behaviour, etc).
3457 os::Aix::scan_environment();
3458
3459 // Probe multipage support.
3460 query_multipage_support();
3461
3462 // Act like we only have one page size by eliminating corner cases which
3463 // we did not support very well anyway.
3464 // We have two input conditions:
3465 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3466 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3467 // setting.
3468 // Data segment page size is important for us because it defines the thread stack page
3469 // size, which is needed for guard page handling, stack banging etc.
3470 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3471 // and should be allocated with 64k pages.
3472 //
3473 // So, we do the following:
3474 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3475 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3476 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3477 // 64k no --- AIX 5.2 ? ---
3478 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3479
3480 // We explicitly leave no option to change page size, because only upgrading would work,
3481 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3482
3483 if (g_multipage_support.datapsize == 4*K) {
3484 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3485 if (g_multipage_support.can_use_64K_pages) {
3486 // .. but we are able to use 64K pages dynamically.
3487 // This would be typical for java launchers which are not linked
3488 // with datapsize=64K (like, any other launcher but our own).
3489 //
3490 // In this case it would be smart to allocate the java heap with 64K
3491 // to get the performance benefit, and to fake 64k pages for the
3492 // data segment (when dealing with thread stacks).
3493 //
3494 // However, leave a possibility to downgrade to 4K, using
3495 // -XX:-Use64KPages.
3496 if (Use64KPages) {
3497 trcVerbose("64K page mode (faked for data segment)");
3498 Aix::_page_size = 64*K;
3499 } else {
3500 trcVerbose("4K page mode (Use64KPages=off)");
3501 Aix::_page_size = 4*K;
3502 }
3503 } else {
3504 // .. and not able to allocate 64k pages dynamically. Here, just
3505 // fall back to 4K paged mode and use mmap for everything.
3506 trcVerbose("4K page mode");
3507 Aix::_page_size = 4*K;
3508 FLAG_SET_ERGO(bool, Use64KPages, false);
3509 }
3510 } else {
3511 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3512 // This normally means that we can allocate 64k pages dynamically.
3513 // (There is one special case where this may be false: EXTSHM=on.
3514 // but we decided to not support that mode).
3515 assert0(g_multipage_support.can_use_64K_pages);
3516 Aix::_page_size = 64*K;
3517 trcVerbose("64K page mode");
3518 FLAG_SET_ERGO(bool, Use64KPages, true);
3519 }
3520
3521 // For now UseLargePages is just ignored.
3522 FLAG_SET_ERGO(bool, UseLargePages, false);
3523 _page_sizes[0] = 0;
3524
3525 // debug trace
3526 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3527
3528 // Next, we need to initialize libo4 and libperfstat libraries.
3529 if (os::Aix::on_pase()) {
3530 os::Aix::initialize_libo4();
3531 } else {
3532 os::Aix::initialize_libperfstat();
3533 }
3534
3535 // Reset the perfstat information provided by ODM.
3536 if (os::Aix::on_aix()) {
3537 libperfstat::perfstat_reset();
3538 }
3539
3540 // Now initialze basic system properties. Note that for some of the values we
3541 // need libperfstat etc.
3542 os::Aix::initialize_system_info();
3543
3544 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3545
3546 init_random(1234567);
3547
3548 // _main_thread points to the thread that created/loaded the JVM.
3549 Aix::_main_thread = pthread_self();
3550
3551 initial_time_count = os::elapsed_counter();
3552
3553 os::Posix::init();
3554 }
3555
3556 // This is called _after_ the global arguments have been parsed.
3557 jint os::init_2(void) {
3558
3559 os::Posix::init_2();
3560
3561 if (os::Aix::on_pase()) {
3562 trcVerbose("Running on PASE.");
3563 } else {
3564 trcVerbose("Running on AIX (not PASE).");
3565 }
3566
3567 trcVerbose("processor count: %d", os::_processor_count);
3568 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3569
3570 // Initially build up the loaded dll map.
3571 LoadedLibraries::reload();
3572 if (Verbose) {
3573 trcVerbose("Loaded Libraries: ");
3574 LoadedLibraries::print(tty);
3575 }
3576
3577 // initialize suspend/resume support - must do this before signal_sets_init()
3578 if (SR_initialize() != 0) {
3579 perror("SR_initialize failed");
3580 return JNI_ERR;
3581 }
3582
3583 Aix::signal_sets_init();
3584 Aix::install_signal_handlers();
3585 // Initialize data for jdk.internal.misc.Signal
3586 if (!ReduceSignalUsage) {
3587 jdk_misc_signal_init();
3588 }
3589
3590 // Check and sets minimum stack sizes against command line options
3591 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3592 return JNI_ERR;
3593 }
3594
3595 if (UseNUMA) {
3596 UseNUMA = false;
3597 warning("NUMA optimizations are not available on this OS.");
3598 }
3599
3600 if (MaxFDLimit) {
3601 // Set the number of file descriptors to max. print out error
3602 // if getrlimit/setrlimit fails but continue regardless.
3603 struct rlimit nbr_files;
3604 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3605 if (status != 0) {
3606 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3607 } else {
3608 nbr_files.rlim_cur = nbr_files.rlim_max;
3609 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3610 if (status != 0) {
3611 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3612 }
3613 }
3614 }
3615
3616 if (PerfAllowAtExitRegistration) {
3617 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3618 // At exit functions can be delayed until process exit time, which
3619 // can be problematic for embedded VM situations. Embedded VMs should
3620 // call DestroyJavaVM() to assure that VM resources are released.
3621
3622 // Note: perfMemory_exit_helper atexit function may be removed in
3623 // the future if the appropriate cleanup code can be added to the
3624 // VM_Exit VMOperation's doit method.
3625 if (atexit(perfMemory_exit_helper) != 0) {
3626 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3627 }
3628 }
3629
3630 return JNI_OK;
3631 }
3632
3633 // Mark the polling page as unreadable
3634 void os::make_polling_page_unreadable(void) {
3635 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3636 fatal("Could not disable polling page");
3637 }
3638 };
3639
3640 // Mark the polling page as readable
3641 void os::make_polling_page_readable(void) {
3642 // Changed according to os_linux.cpp.
3643 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3644 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3645 }
3646 };
3647
3648 int os::active_processor_count() {
3649 // User has overridden the number of active processors
3650 if (ActiveProcessorCount > 0) {
3651 log_trace(os)("active_processor_count: "
3652 "active processor count set by user : %d",
3653 ActiveProcessorCount);
3654 return ActiveProcessorCount;
3655 }
3656
3657 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3658 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3659 return online_cpus;
3660 }
3661
3662 void os::set_native_thread_name(const char *name) {
3663 // Not yet implemented.
3664 return;
3665 }
3666
3667 bool os::distribute_processes(uint length, uint* distribution) {
3668 // Not yet implemented.
3669 return false;
3670 }
3671
3672 bool os::bind_to_processor(uint processor_id) {
3673 // Not yet implemented.
3674 return false;
3675 }
3676
3677 void os::SuspendedThreadTask::internal_do_task() {
3678 if (do_suspend(_thread->osthread())) {
3679 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3680 do_task(context);
3681 do_resume(_thread->osthread());
3682 }
3683 }
3684
3685 ////////////////////////////////////////////////////////////////////////////////
3686 // debug support
3687
3688 bool os::find(address addr, outputStream* st) {
3689
3690 st->print(PTR_FORMAT ": ", addr);
3691
3692 loaded_module_t lm;
3693 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3694 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3695 st->print_cr("%s", lm.path);
3696 return true;
3697 }
3698
3699 return false;
3700 }
3701
3702 ////////////////////////////////////////////////////////////////////////////////
3703 // misc
3704
3705 // This does not do anything on Aix. This is basically a hook for being
3706 // able to use structured exception handling (thread-local exception filters)
3707 // on, e.g., Win32.
3708 void
3709 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3710 JavaCallArguments* args, Thread* thread) {
3711 f(value, method, args, thread);
3712 }
3713
3714 void os::print_statistics() {
3715 }
3716
3717 bool os::message_box(const char* title, const char* message) {
3718 int i;
3719 fdStream err(defaultStream::error_fd());
3720 for (i = 0; i < 78; i++) err.print_raw("=");
3721 err.cr();
3722 err.print_raw_cr(title);
3723 for (i = 0; i < 78; i++) err.print_raw("-");
3724 err.cr();
3725 err.print_raw_cr(message);
3726 for (i = 0; i < 78; i++) err.print_raw("=");
3727 err.cr();
3728
3729 char buf[16];
3730 // Prevent process from exiting upon "read error" without consuming all CPU
3731 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3732
3733 return buf[0] == 'y' || buf[0] == 'Y';
3734 }
3735
3736 int os::stat(const char *path, struct stat *sbuf) {
3737 char pathbuf[MAX_PATH];
3738 if (strlen(path) > MAX_PATH - 1) {
3739 errno = ENAMETOOLONG;
3740 return -1;
3741 }
3742 os::native_path(strcpy(pathbuf, path));
3743 return ::stat(pathbuf, sbuf);
3744 }
3745
3746 // Is a (classpath) directory empty?
3747 bool os::dir_is_empty(const char* path) {
3748 DIR *dir = NULL;
3749 struct dirent *ptr;
3750
3751 dir = opendir(path);
3752 if (dir == NULL) return true;
3753
3754 /* Scan the directory */
3755 bool result = true;
3756 char buf[sizeof(struct dirent) + MAX_PATH];
3757 while (result && (ptr = ::readdir(dir)) != NULL) {
3758 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3759 result = false;
3760 }
3761 }
3762 closedir(dir);
3763 return result;
3764 }
3765
3766 // This code originates from JDK's sysOpen and open64_w
3767 // from src/solaris/hpi/src/system_md.c
3768
3769 int os::open(const char *path, int oflag, int mode) {
3770
3771 if (strlen(path) > MAX_PATH - 1) {
3772 errno = ENAMETOOLONG;
3773 return -1;
3774 }
3775 int fd;
3776
3777 fd = ::open64(path, oflag, mode);
3778 if (fd == -1) return -1;
3779
3780 // If the open succeeded, the file might still be a directory.
3781 {
3782 struct stat64 buf64;
3783 int ret = ::fstat64(fd, &buf64);
3784 int st_mode = buf64.st_mode;
3785
3786 if (ret != -1) {
3787 if ((st_mode & S_IFMT) == S_IFDIR) {
3788 errno = EISDIR;
3789 ::close(fd);
3790 return -1;
3791 }
3792 } else {
3793 ::close(fd);
3794 return -1;
3795 }
3796 }
3797
3798 // All file descriptors that are opened in the JVM and not
3799 // specifically destined for a subprocess should have the
3800 // close-on-exec flag set. If we don't set it, then careless 3rd
3801 // party native code might fork and exec without closing all
3802 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3803 // UNIXProcess.c), and this in turn might:
3804 //
3805 // - cause end-of-file to fail to be detected on some file
3806 // descriptors, resulting in mysterious hangs, or
3807 //
3808 // - might cause an fopen in the subprocess to fail on a system
3809 // suffering from bug 1085341.
3810 //
3811 // (Yes, the default setting of the close-on-exec flag is a Unix
3812 // design flaw.)
3813 //
3814 // See:
3815 // 1085341: 32-bit stdio routines should support file descriptors >255
3816 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3817 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3818 #ifdef FD_CLOEXEC
3819 {
3820 int flags = ::fcntl(fd, F_GETFD);
3821 if (flags != -1)
3822 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3823 }
3824 #endif
3825
3826 return fd;
3827 }
3828
3829 // create binary file, rewriting existing file if required
3830 int os::create_binary_file(const char* path, bool rewrite_existing) {
3831 int oflags = O_WRONLY | O_CREAT;
3832 if (!rewrite_existing) {
3833 oflags |= O_EXCL;
3834 }
3835 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3836 }
3837
3838 // return current position of file pointer
3839 jlong os::current_file_offset(int fd) {
3840 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3841 }
3842
3843 // move file pointer to the specified offset
3844 jlong os::seek_to_file_offset(int fd, jlong offset) {
3845 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3846 }
3847
3848 // This code originates from JDK's sysAvailable
3849 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3850
3851 int os::available(int fd, jlong *bytes) {
3852 jlong cur, end;
3853 int mode;
3854 struct stat64 buf64;
3855
3856 if (::fstat64(fd, &buf64) >= 0) {
3857 mode = buf64.st_mode;
3858 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3859 int n;
3860 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3861 *bytes = n;
3862 return 1;
3863 }
3864 }
3865 }
3866 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3867 return 0;
3868 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3869 return 0;
3870 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3871 return 0;
3872 }
3873 *bytes = end - cur;
3874 return 1;
3875 }
3876
3877 // Map a block of memory.
3878 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3879 char *addr, size_t bytes, bool read_only,
3880 bool allow_exec) {
3881 int prot;
3882 int flags = MAP_PRIVATE;
3883
3884 if (read_only) {
3885 prot = PROT_READ;
3886 flags = MAP_SHARED;
3887 } else {
3888 prot = PROT_READ | PROT_WRITE;
3889 flags = MAP_PRIVATE;
3890 }
3891
3892 if (allow_exec) {
3893 prot |= PROT_EXEC;
3894 }
3895
3896 if (addr != NULL) {
3897 flags |= MAP_FIXED;
3898 }
3899
3900 // Allow anonymous mappings if 'fd' is -1.
3901 if (fd == -1) {
3902 flags |= MAP_ANONYMOUS;
3903 }
3904
3905 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3906 fd, file_offset);
3907 if (mapped_address == MAP_FAILED) {
3908 return NULL;
3909 }
3910 return mapped_address;
3911 }
3912
3913 // Remap a block of memory.
3914 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3915 char *addr, size_t bytes, bool read_only,
3916 bool allow_exec) {
3917 // same as map_memory() on this OS
3918 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3919 allow_exec);
3920 }
3921
3922 // Unmap a block of memory.
3923 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3924 return munmap(addr, bytes) == 0;
3925 }
3926
3927 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3928 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3929 // of a thread.
3930 //
3931 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3932 // the fast estimate available on the platform.
3933
3934 jlong os::current_thread_cpu_time() {
3935 // return user + sys since the cost is the same
3936 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3937 assert(n >= 0, "negative CPU time");
3938 return n;
3939 }
3940
3941 jlong os::thread_cpu_time(Thread* thread) {
3942 // consistent with what current_thread_cpu_time() returns
3943 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3944 assert(n >= 0, "negative CPU time");
3945 return n;
3946 }
3947
3948 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3949 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3950 assert(n >= 0, "negative CPU time");
3951 return n;
3952 }
3953
3954 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3955 bool error = false;
3956
3957 jlong sys_time = 0;
3958 jlong user_time = 0;
3959
3960 // Reimplemented using getthrds64().
3961 //
3962 // Works like this:
3963 // For the thread in question, get the kernel thread id. Then get the
3964 // kernel thread statistics using that id.
3965 //
3966 // This only works of course when no pthread scheduling is used,
3967 // i.e. there is a 1:1 relationship to kernel threads.
3968 // On AIX, see AIXTHREAD_SCOPE variable.
3969
3970 pthread_t pthtid = thread->osthread()->pthread_id();
3971
3972 // retrieve kernel thread id for the pthread:
3973 tid64_t tid = 0;
3974 struct __pthrdsinfo pinfo;
3975 // I just love those otherworldly IBM APIs which force me to hand down
3976 // dummy buffers for stuff I dont care for...
3977 char dummy[1];
3978 int dummy_size = sizeof(dummy);
3979 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3980 dummy, &dummy_size) == 0) {
3981 tid = pinfo.__pi_tid;
3982 } else {
3983 tty->print_cr("pthread_getthrds_np failed.");
3984 error = true;
3985 }
3986
3987 // retrieve kernel timing info for that kernel thread
3988 if (!error) {
3989 struct thrdentry64 thrdentry;
3990 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3991 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3992 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3993 } else {
3994 tty->print_cr("pthread_getthrds_np failed.");
3995 error = true;
3996 }
3997 }
3998
3999 if (p_sys_time) {
4000 *p_sys_time = sys_time;
4001 }
4002
4003 if (p_user_time) {
4004 *p_user_time = user_time;
4005 }
4006
4007 if (error) {
4008 return false;
4009 }
4010
4011 return true;
4012 }
4013
4014 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4015 jlong sys_time;
4016 jlong user_time;
4017
4018 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4019 return -1;
4020 }
4021
4022 return user_sys_cpu_time ? sys_time + user_time : user_time;
4023 }
4024
4025 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4026 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4027 info_ptr->may_skip_backward = false; // elapsed time not wall time
4028 info_ptr->may_skip_forward = false; // elapsed time not wall time
4029 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4030 }
4031
4032 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4033 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4034 info_ptr->may_skip_backward = false; // elapsed time not wall time
4035 info_ptr->may_skip_forward = false; // elapsed time not wall time
4036 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4037 }
4038
4039 bool os::is_thread_cpu_time_supported() {
4040 return true;
4041 }
4042
4043 // System loadavg support. Returns -1 if load average cannot be obtained.
4044 // For now just return the system wide load average (no processor sets).
4045 int os::loadavg(double values[], int nelem) {
4046
4047 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4048 guarantee(values, "argument error");
4049
4050 if (os::Aix::on_pase()) {
4051
4052 // AS/400 PASE: use libo4 porting library
4053 double v[3] = { 0.0, 0.0, 0.0 };
4054
4055 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4056 for (int i = 0; i < nelem; i ++) {
4057 values[i] = v[i];
4058 }
4059 return nelem;
4060 } else {
4061 return -1;
4062 }
4063
4064 } else {
4065
4066 // AIX: use libperfstat
4067 libperfstat::cpuinfo_t ci;
4068 if (libperfstat::get_cpuinfo(&ci)) {
4069 for (int i = 0; i < nelem; i++) {
4070 values[i] = ci.loadavg[i];
4071 }
4072 } else {
4073 return -1;
4074 }
4075 return nelem;
4076 }
4077 }
4078
4079 void os::pause() {
4080 char filename[MAX_PATH];
4081 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4082 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4083 } else {
4084 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4085 }
4086
4087 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4088 if (fd != -1) {
4089 struct stat buf;
4090 ::close(fd);
4091 while (::stat(filename, &buf) == 0) {
4092 (void)::poll(NULL, 0, 100);
4093 }
4094 } else {
4095 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4096 }
4097 }
4098
4099 bool os::is_primordial_thread(void) {
4100 if (pthread_self() == (pthread_t)1) {
4101 return true;
4102 } else {
4103 return false;
4104 }
4105 }
4106
4107 // OS recognitions (PASE/AIX, OS level) call this before calling any
4108 // one of Aix::on_pase(), Aix::os_version() static
4109 void os::Aix::initialize_os_info() {
4110
4111 assert(_on_pase == -1 && _os_version == 0, "already called.");
4112
4113 struct utsname uts;
4114 memset(&uts, 0, sizeof(uts));
4115 strcpy(uts.sysname, "?");
4116 if (::uname(&uts) == -1) {
4117 trcVerbose("uname failed (%d)", errno);
4118 guarantee(0, "Could not determine whether we run on AIX or PASE");
4119 } else {
4120 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4121 "node \"%s\" machine \"%s\"\n",
4122 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4123 const int major = atoi(uts.version);
4124 assert(major > 0, "invalid OS version");
4125 const int minor = atoi(uts.release);
4126 assert(minor > 0, "invalid OS release");
4127 _os_version = (major << 24) | (minor << 16);
4128 char ver_str[20] = {0};
4129 char *name_str = "unknown OS";
4130 if (strcmp(uts.sysname, "OS400") == 0) {
4131 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4132 _on_pase = 1;
4133 if (os_version_short() < 0x0504) {
4134 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4135 assert(false, "OS/400 release too old.");
4136 }
4137 name_str = "OS/400 (pase)";
4138 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4139 } else if (strcmp(uts.sysname, "AIX") == 0) {
4140 // We run on AIX. We do not support versions older than AIX 5.3.
4141 _on_pase = 0;
4142 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4143 odmWrapper::determine_os_kernel_version(&_os_version);
4144 if (os_version_short() < 0x0503) {
4145 trcVerbose("AIX release older than AIX 5.3 not supported.");
4146 assert(false, "AIX release too old.");
4147 }
4148 name_str = "AIX";
4149 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4150 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4151 } else {
4152 assert(false, name_str);
4153 }
4154 trcVerbose("We run on %s %s", name_str, ver_str);
4155 }
4156
4157 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4158 } // end: os::Aix::initialize_os_info()
4159
4160 // Scan environment for important settings which might effect the VM.
4161 // Trace out settings. Warn about invalid settings and/or correct them.
4162 //
4163 // Must run after os::Aix::initialue_os_info().
4164 void os::Aix::scan_environment() {
4165
4166 char* p;
4167 int rc;
4168
4169 // Warn explicity if EXTSHM=ON is used. That switch changes how
4170 // System V shared memory behaves. One effect is that page size of
4171 // shared memory cannot be change dynamically, effectivly preventing
4172 // large pages from working.
4173 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4174 // recommendation is (in OSS notes) to switch it off.
4175 p = ::getenv("EXTSHM");
4176 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4177 if (p && strcasecmp(p, "ON") == 0) {
4178 _extshm = 1;
4179 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4180 if (!AllowExtshm) {
4181 // We allow under certain conditions the user to continue. However, we want this
4182 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4183 // that the VM is not able to allocate 64k pages for the heap.
4184 // We do not want to run with reduced performance.
4185 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4186 }
4187 } else {
4188 _extshm = 0;
4189 }
4190
4191 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4192 // Not tested, not supported.
4193 //
4194 // Note that it might be worth the trouble to test and to require it, if only to
4195 // get useful return codes for mprotect.
4196 //
4197 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4198 // exec() ? before loading the libjvm ? ....)
4199 p = ::getenv("XPG_SUS_ENV");
4200 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4201 if (p && strcmp(p, "ON") == 0) {
4202 _xpg_sus_mode = 1;
4203 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4204 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4205 // clobber address ranges. If we ever want to support that, we have to do some
4206 // testing first.
4207 guarantee(false, "XPG_SUS_ENV=ON not supported");
4208 } else {
4209 _xpg_sus_mode = 0;
4210 }
4211
4212 if (os::Aix::on_pase()) {
4213 p = ::getenv("QIBM_MULTI_THREADED");
4214 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4215 }
4216
4217 p = ::getenv("LDR_CNTRL");
4218 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4219 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4220 if (p && ::strstr(p, "TEXTPSIZE")) {
4221 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4222 "you may experience hangs or crashes on OS/400 V7R1.");
4223 }
4224 }
4225
4226 p = ::getenv("AIXTHREAD_GUARDPAGES");
4227 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4228
4229 } // end: os::Aix::scan_environment()
4230
4231 // PASE: initialize the libo4 library (PASE porting library).
4232 void os::Aix::initialize_libo4() {
4233 guarantee(os::Aix::on_pase(), "OS/400 only.");
4234 if (!libo4::init()) {
4235 trcVerbose("libo4 initialization failed.");
4236 assert(false, "libo4 initialization failed");
4237 } else {
4238 trcVerbose("libo4 initialized.");
4239 }
4240 }
4241
4242 // AIX: initialize the libperfstat library.
4243 void os::Aix::initialize_libperfstat() {
4244 assert(os::Aix::on_aix(), "AIX only");
4245 if (!libperfstat::init()) {
4246 trcVerbose("libperfstat initialization failed.");
4247 assert(false, "libperfstat initialization failed");
4248 } else {
4249 trcVerbose("libperfstat initialized.");
4250 }
4251 }
4252
4253 /////////////////////////////////////////////////////////////////////////////
4254 // thread stack
4255
4256 // Get the current stack base from the OS (actually, the pthread library).
4257 // Note: usually not page aligned.
4258 address os::current_stack_base() {
4259 AixMisc::stackbounds_t bounds;
4260 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4261 guarantee(rc, "Unable to retrieve stack bounds.");
4262 return bounds.base;
4263 }
4264
4265 // Get the current stack size from the OS (actually, the pthread library).
4266 // Returned size is such that (base - size) is always aligned to page size.
4267 size_t os::current_stack_size() {
4268 AixMisc::stackbounds_t bounds;
4269 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4270 guarantee(rc, "Unable to retrieve stack bounds.");
4271 // Align the returned stack size such that the stack low address
4272 // is aligned to page size (Note: base is usually not and we do not care).
4273 // We need to do this because caller code will assume stack low address is
4274 // page aligned and will place guard pages without checking.
4275 address low = bounds.base - bounds.size;
4276 address low_aligned = (address)align_up(low, os::vm_page_size());
4277 size_t s = bounds.base - low_aligned;
4278 return s;
4279 }
4280
4281 extern char** environ;
4282
4283 // Run the specified command in a separate process. Return its exit value,
4284 // or -1 on failure (e.g. can't fork a new process).
4285 // Unlike system(), this function can be called from signal handler. It
4286 // doesn't block SIGINT et al.
4287 int os::fork_and_exec(char* cmd) {
4288 char * argv[4] = {"sh", "-c", cmd, NULL};
4289
4290 pid_t pid = fork();
4291
4292 if (pid < 0) {
4293 // fork failed
4294 return -1;
4295
4296 } else if (pid == 0) {
4297 // child process
4298
4299 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4300 execve("/usr/bin/sh", argv, environ);
4301
4302 // execve failed
4303 _exit(-1);
4304
4305 } else {
4306 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4307 // care about the actual exit code, for now.
4308
4309 int status;
4310
4311 // Wait for the child process to exit. This returns immediately if
4312 // the child has already exited. */
4313 while (waitpid(pid, &status, 0) < 0) {
4314 switch (errno) {
4315 case ECHILD: return 0;
4316 case EINTR: break;
4317 default: return -1;
4318 }
4319 }
4320
4321 if (WIFEXITED(status)) {
4322 // The child exited normally; get its exit code.
4323 return WEXITSTATUS(status);
4324 } else if (WIFSIGNALED(status)) {
4325 // The child exited because of a signal.
4326 // The best value to return is 0x80 + signal number,
4327 // because that is what all Unix shells do, and because
4328 // it allows callers to distinguish between process exit and
4329 // process death by signal.
4330 return 0x80 + WTERMSIG(status);
4331 } else {
4332 // Unknown exit code; pass it through.
4333 return status;
4334 }
4335 }
4336 return -1;
4337 }
4338
4339 // Get the default path to the core file
4340 // Returns the length of the string
4341 int os::get_core_path(char* buffer, size_t bufferSize) {
4342 const char* p = get_current_directory(buffer, bufferSize);
4343
4344 if (p == NULL) {
4345 assert(p != NULL, "failed to get current directory");
4346 return 0;
4347 }
4348
4349 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4350 p, current_process_id());
4351
4352 return strlen(buffer);
4353 }
4354
4355 #ifndef PRODUCT
4356 void TestReserveMemorySpecial_test() {
4357 // No tests available for this platform
4358 }
4359 #endif
4360
4361 bool os::start_debugging(char *buf, int buflen) {
4362 int len = (int)strlen(buf);
4363 char *p = &buf[len];
4364
4365 jio_snprintf(p, buflen -len,
4366 "\n\n"
4367 "Do you want to debug the problem?\n\n"
4368 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4369 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4370 "Otherwise, press RETURN to abort...",
4371 os::current_process_id(),
4372 os::current_thread_id(), thread_self());
4373
4374 bool yes = os::message_box("Unexpected Error", buf);
4375
4376 if (yes) {
4377 // yes, user asked VM to launch debugger
4378 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4379
4380 os::fork_and_exec(buf);
4381 yes = false;
4382 }
4383 return yes;
4384 }
4385
4386 static inline time_t get_mtime(const char* filename) {
4387 struct stat st;
4388 int ret = os::stat(filename, &st);
4389 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4390 return st.st_mtime;
4391 }
4392
4393 int os::compare_file_modified_times(const char* file1, const char* file2) {
4394 time_t t1 = get_mtime(file1);
4395 time_t t2 = get_mtime(file2);
4396 return t1 - t2;
4397 }