1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2018 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // According to the AIX OS doc #pragma alloca must be used
27 // with C++ compiler before referencing the function alloca()
28 #pragma alloca
29
30 // no precompiled headers
31 #include "jvm.h"
32 #include "classfile/classLoader.hpp"
33 #include "classfile/systemDictionary.hpp"
34 #include "classfile/vmSymbols.hpp"
35 #include "code/icBuffer.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/compileBroker.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "logging/log.hpp"
40 #include "libo4.hpp"
41 #include "libperfstat_aix.hpp"
42 #include "libodm_aix.hpp"
43 #include "loadlib_aix.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/filemap.hpp"
46 #include "misc_aix.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "os_aix.inline.hpp"
49 #include "os_share_aix.hpp"
50 #include "porting_aix.hpp"
51 #include "prims/jniFastGetField.hpp"
52 #include "prims/jvm_misc.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/extendedPC.hpp"
56 #include "runtime/globals.hpp"
57 #include "runtime/interfaceSupport.inline.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/orderAccess.inline.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_5_Compat
135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
136 #endif
137 #ifndef PV_6
138 #define PV_6 0x100000 /* Power PC 6 */
139 #endif
140 #ifndef PV_6_1
141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
142 #endif
143 #ifndef PV_6_Compat
144 #define PV_6_Compat 0x108000 /* Power PC 6 */
145 #endif
146 #ifndef PV_7
147 #define PV_7 0x200000 /* Power PC 7 */
148 #endif
149 #ifndef PV_7_Compat
150 #define PV_7_Compat 0x208000 /* Power PC 7 */
151 #endif
152 #ifndef PV_8
153 #define PV_8 0x300000 /* Power PC 8 */
154 #endif
155 #ifndef PV_8_Compat
156 #define PV_8_Compat 0x308000 /* Power PC 8 */
157 #endif
158
159 static address resolve_function_descriptor_to_code_pointer(address p);
160
161 static void vmembk_print_on(outputStream* os);
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // global variables (for a description see os_aix.hpp)
165
166 julong os::Aix::_physical_memory = 0;
167
168 pthread_t os::Aix::_main_thread = ((pthread_t)0);
169 int os::Aix::_page_size = -1;
170
171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
172 int os::Aix::_on_pase = -1;
173
174 // 0 = uninitialized, otherwise 32 bit number:
175 // 0xVVRRTTSS
176 // VV - major version
177 // RR - minor version
178 // TT - tech level, if known, 0 otherwise
179 // SS - service pack, if known, 0 otherwise
180 uint32_t os::Aix::_os_version = 0;
181
182 // -1 = uninitialized, 0 - no, 1 - yes
183 int os::Aix::_xpg_sus_mode = -1;
184
185 // -1 = uninitialized, 0 - no, 1 - yes
186 int os::Aix::_extshm = -1;
187
188 ////////////////////////////////////////////////////////////////////////////////
189 // local variables
190
191 static volatile jlong max_real_time = 0;
192 static jlong initial_time_count = 0;
193 static int clock_tics_per_sec = 100;
194 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
195 static bool check_signals = true;
196 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
197 static sigset_t SR_sigset;
198
199 // Process break recorded at startup.
200 static address g_brk_at_startup = NULL;
201
202 // This describes the state of multipage support of the underlying
203 // OS. Note that this is of no interest to the outsize world and
204 // therefore should not be defined in AIX class.
205 //
206 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
207 // latter two (16M "large" resp. 16G "huge" pages) require special
208 // setup and are normally not available.
209 //
210 // AIX supports multiple page sizes per process, for:
211 // - Stack (of the primordial thread, so not relevant for us)
212 // - Data - data, bss, heap, for us also pthread stacks
213 // - Text - text code
214 // - shared memory
215 //
216 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
217 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
218 //
219 // For shared memory, page size can be set dynamically via
220 // shmctl(). Different shared memory regions can have different page
221 // sizes.
222 //
223 // More information can be found at AIBM info center:
224 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
225 //
226 static struct {
227 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
228 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
229 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
230 size_t pthr_stack_pagesize; // stack page size of pthread threads
231 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
232 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
233 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
234 int error; // Error describing if something went wrong at multipage init.
235 } g_multipage_support = {
236 (size_t) -1,
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 (size_t) -1,
241 false, false,
242 0
243 };
244
245 // We must not accidentally allocate memory close to the BRK - even if
246 // that would work - because then we prevent the BRK segment from
247 // growing which may result in a malloc OOM even though there is
248 // enough memory. The problem only arises if we shmat() or mmap() at
249 // a specific wish address, e.g. to place the heap in a
250 // compressed-oops-friendly way.
251 static bool is_close_to_brk(address a) {
252 assert0(g_brk_at_startup != NULL);
253 if (a >= g_brk_at_startup &&
254 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
255 return true;
256 }
257 return false;
258 }
259
260 julong os::available_memory() {
261 return Aix::available_memory();
262 }
263
264 julong os::Aix::available_memory() {
265 // Avoid expensive API call here, as returned value will always be null.
266 if (os::Aix::on_pase()) {
267 return 0x0LL;
268 }
269 os::Aix::meminfo_t mi;
270 if (os::Aix::get_meminfo(&mi)) {
271 return mi.real_free;
272 } else {
273 return ULONG_MAX;
274 }
275 }
276
277 julong os::physical_memory() {
278 return Aix::physical_memory();
279 }
280
281 // Return true if user is running as root.
282
283 bool os::have_special_privileges() {
284 static bool init = false;
285 static bool privileges = false;
286 if (!init) {
287 privileges = (getuid() != geteuid()) || (getgid() != getegid());
288 init = true;
289 }
290 return privileges;
291 }
292
293 // Helper function, emulates disclaim64 using multiple 32bit disclaims
294 // because we cannot use disclaim64() on AS/400 and old AIX releases.
295 static bool my_disclaim64(char* addr, size_t size) {
296
297 if (size == 0) {
298 return true;
299 }
300
301 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
302 const unsigned int maxDisclaimSize = 0x40000000;
303
304 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
305 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
306
307 char* p = addr;
308
309 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
310 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
311 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
312 return false;
313 }
314 p += maxDisclaimSize;
315 }
316
317 if (lastDisclaimSize > 0) {
318 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
319 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
320 return false;
321 }
322 }
323
324 return true;
325 }
326
327 // Cpu architecture string
328 #if defined(PPC32)
329 static char cpu_arch[] = "ppc";
330 #elif defined(PPC64)
331 static char cpu_arch[] = "ppc64";
332 #else
333 #error Add appropriate cpu_arch setting
334 #endif
335
336 // Wrap the function "vmgetinfo" which is not available on older OS releases.
337 static int checked_vmgetinfo(void *out, int command, int arg) {
338 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
339 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
340 }
341 return ::vmgetinfo(out, command, arg);
342 }
343
344 // Given an address, returns the size of the page backing that address.
345 size_t os::Aix::query_pagesize(void* addr) {
346
347 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
348 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
349 return 4*K;
350 }
351
352 vm_page_info pi;
353 pi.addr = (uint64_t)addr;
354 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
355 return pi.pagesize;
356 } else {
357 assert(false, "vmgetinfo failed to retrieve page size");
358 return 4*K;
359 }
360 }
361
362 void os::Aix::initialize_system_info() {
363
364 // Get the number of online(logical) cpus instead of configured.
365 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
366 assert(_processor_count > 0, "_processor_count must be > 0");
367
368 // Retrieve total physical storage.
369 os::Aix::meminfo_t mi;
370 if (!os::Aix::get_meminfo(&mi)) {
371 assert(false, "os::Aix::get_meminfo failed.");
372 }
373 _physical_memory = (julong) mi.real_total;
374 }
375
376 // Helper function for tracing page sizes.
377 static const char* describe_pagesize(size_t pagesize) {
378 switch (pagesize) {
379 case 4*K : return "4K";
380 case 64*K: return "64K";
381 case 16*M: return "16M";
382 case 16*G: return "16G";
383 default:
384 assert(false, "surprise");
385 return "??";
386 }
387 }
388
389 // Probe OS for multipage support.
390 // Will fill the global g_multipage_support structure.
391 // Must be called before calling os::large_page_init().
392 static void query_multipage_support() {
393
394 guarantee(g_multipage_support.pagesize == -1,
395 "do not call twice");
396
397 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
398
399 // This really would surprise me.
400 assert(g_multipage_support.pagesize == 4*K, "surprise!");
401
402 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
403 // Default data page size is defined either by linker options (-bdatapsize)
404 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
405 // default should be 4K.
406 {
407 void* p = ::malloc(16*M);
408 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
409 ::free(p);
410 }
411
412 // Query default shm page size (LDR_CNTRL SHMPSIZE).
413 // Note that this is pure curiosity. We do not rely on default page size but set
414 // our own page size after allocated.
415 {
416 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
417 guarantee(shmid != -1, "shmget failed");
418 void* p = ::shmat(shmid, NULL, 0);
419 ::shmctl(shmid, IPC_RMID, NULL);
420 guarantee(p != (void*) -1, "shmat failed");
421 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
422 ::shmdt(p);
423 }
424
425 // Before querying the stack page size, make sure we are not running as primordial
426 // thread (because primordial thread's stack may have different page size than
427 // pthread thread stacks). Running a VM on the primordial thread won't work for a
428 // number of reasons so we may just as well guarantee it here.
429 guarantee0(!os::is_primordial_thread());
430
431 // Query pthread stack page size. Should be the same as data page size because
432 // pthread stacks are allocated from C-Heap.
433 {
434 int dummy = 0;
435 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
436 }
437
438 // Query default text page size (LDR_CNTRL TEXTPSIZE).
439 {
440 address any_function =
441 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
442 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
443 }
444
445 // Now probe for support of 64K pages and 16M pages.
446
447 // Before OS/400 V6R1, there is no support for pages other than 4K.
448 if (os::Aix::on_pase_V5R4_or_older()) {
449 trcVerbose("OS/400 < V6R1 - no large page support.");
450 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
451 goto query_multipage_support_end;
452 }
453
454 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
455 {
456 const int MAX_PAGE_SIZES = 4;
457 psize_t sizes[MAX_PAGE_SIZES];
458 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
459 if (num_psizes == -1) {
460 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
461 trcVerbose("disabling multipage support.");
462 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
463 goto query_multipage_support_end;
464 }
465 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
466 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
467 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
468 for (int i = 0; i < num_psizes; i ++) {
469 trcVerbose(" %s ", describe_pagesize(sizes[i]));
470 }
471
472 // Can we use 64K, 16M pages?
473 for (int i = 0; i < num_psizes; i ++) {
474 const size_t pagesize = sizes[i];
475 if (pagesize != 64*K && pagesize != 16*M) {
476 continue;
477 }
478 bool can_use = false;
479 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
480 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
481 IPC_CREAT | S_IRUSR | S_IWUSR);
482 guarantee0(shmid != -1); // Should always work.
483 // Try to set pagesize.
484 struct shmid_ds shm_buf = { 0 };
485 shm_buf.shm_pagesize = pagesize;
486 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
487 const int en = errno;
488 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
489 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
490 errno);
491 } else {
492 // Attach and double check pageisze.
493 void* p = ::shmat(shmid, NULL, 0);
494 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
495 guarantee0(p != (void*) -1); // Should always work.
496 const size_t real_pagesize = os::Aix::query_pagesize(p);
497 if (real_pagesize != pagesize) {
498 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
499 } else {
500 can_use = true;
501 }
502 ::shmdt(p);
503 }
504 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
505 if (pagesize == 64*K) {
506 g_multipage_support.can_use_64K_pages = can_use;
507 } else if (pagesize == 16*M) {
508 g_multipage_support.can_use_16M_pages = can_use;
509 }
510 }
511
512 } // end: check which pages can be used for shared memory
513
514 query_multipage_support_end:
515
516 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
517 describe_pagesize(g_multipage_support.pagesize));
518 trcVerbose("Data page size (C-Heap, bss, etc): %s",
519 describe_pagesize(g_multipage_support.datapsize));
520 trcVerbose("Text page size: %s",
521 describe_pagesize(g_multipage_support.textpsize));
522 trcVerbose("Thread stack page size (pthread): %s",
523 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
524 trcVerbose("Default shared memory page size: %s",
525 describe_pagesize(g_multipage_support.shmpsize));
526 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
527 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
528 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
529 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
530 trcVerbose("Multipage error details: %d",
531 g_multipage_support.error);
532
533 // sanity checks
534 assert0(g_multipage_support.pagesize == 4*K);
535 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
536 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
537 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
538 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
539
540 }
541
542 void os::init_system_properties_values() {
543
544 #define DEFAULT_LIBPATH "/lib:/usr/lib"
545 #define EXTENSIONS_DIR "/lib/ext"
546
547 // Buffer that fits several sprintfs.
548 // Note that the space for the trailing null is provided
549 // by the nulls included by the sizeof operator.
550 const size_t bufsize =
551 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
552 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
553 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
554
555 // sysclasspath, java_home, dll_dir
556 {
557 char *pslash;
558 os::jvm_path(buf, bufsize);
559
560 // Found the full path to libjvm.so.
561 // Now cut the path to <java_home>/jre if we can.
562 pslash = strrchr(buf, '/');
563 if (pslash != NULL) {
564 *pslash = '\0'; // Get rid of /libjvm.so.
565 }
566 pslash = strrchr(buf, '/');
567 if (pslash != NULL) {
568 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
569 }
570 Arguments::set_dll_dir(buf);
571
572 if (pslash != NULL) {
573 pslash = strrchr(buf, '/');
574 if (pslash != NULL) {
575 *pslash = '\0'; // Get rid of /lib.
576 }
577 }
578 Arguments::set_java_home(buf);
579 set_boot_path('/', ':');
580 }
581
582 // Where to look for native libraries.
583
584 // On Aix we get the user setting of LIBPATH.
585 // Eventually, all the library path setting will be done here.
586 // Get the user setting of LIBPATH.
587 const char *v = ::getenv("LIBPATH");
588 const char *v_colon = ":";
589 if (v == NULL) { v = ""; v_colon = ""; }
590
591 // Concatenate user and invariant part of ld_library_path.
592 // That's +1 for the colon and +1 for the trailing '\0'.
593 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
594 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
595 Arguments::set_library_path(ld_library_path);
596 FREE_C_HEAP_ARRAY(char, ld_library_path);
597
598 // Extensions directories.
599 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
600 Arguments::set_ext_dirs(buf);
601
602 FREE_C_HEAP_ARRAY(char, buf);
603
604 #undef DEFAULT_LIBPATH
605 #undef EXTENSIONS_DIR
606 }
607
608 ////////////////////////////////////////////////////////////////////////////////
609 // breakpoint support
610
611 void os::breakpoint() {
612 BREAKPOINT;
613 }
614
615 extern "C" void breakpoint() {
616 // use debugger to set breakpoint here
617 }
618
619 ////////////////////////////////////////////////////////////////////////////////
620 // signal support
621
622 debug_only(static bool signal_sets_initialized = false);
623 static sigset_t unblocked_sigs, vm_sigs;
624
625 bool os::Aix::is_sig_ignored(int sig) {
626 struct sigaction oact;
627 sigaction(sig, (struct sigaction*)NULL, &oact);
628 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
629 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
630 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
631 return true;
632 } else {
633 return false;
634 }
635 }
636
637 void os::Aix::signal_sets_init() {
638 // Should also have an assertion stating we are still single-threaded.
639 assert(!signal_sets_initialized, "Already initialized");
640 // Fill in signals that are necessarily unblocked for all threads in
641 // the VM. Currently, we unblock the following signals:
642 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
643 // by -Xrs (=ReduceSignalUsage));
644 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
645 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
646 // the dispositions or masks wrt these signals.
647 // Programs embedding the VM that want to use the above signals for their
648 // own purposes must, at this time, use the "-Xrs" option to prevent
649 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
650 // (See bug 4345157, and other related bugs).
651 // In reality, though, unblocking these signals is really a nop, since
652 // these signals are not blocked by default.
653 sigemptyset(&unblocked_sigs);
654 sigaddset(&unblocked_sigs, SIGILL);
655 sigaddset(&unblocked_sigs, SIGSEGV);
656 sigaddset(&unblocked_sigs, SIGBUS);
657 sigaddset(&unblocked_sigs, SIGFPE);
658 sigaddset(&unblocked_sigs, SIGTRAP);
659 sigaddset(&unblocked_sigs, SR_signum);
660
661 if (!ReduceSignalUsage) {
662 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
663 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
664 }
665 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
666 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
667 }
668 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
669 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
670 }
671 }
672 // Fill in signals that are blocked by all but the VM thread.
673 sigemptyset(&vm_sigs);
674 if (!ReduceSignalUsage)
675 sigaddset(&vm_sigs, BREAK_SIGNAL);
676 debug_only(signal_sets_initialized = true);
677 }
678
679 // These are signals that are unblocked while a thread is running Java.
680 // (For some reason, they get blocked by default.)
681 sigset_t* os::Aix::unblocked_signals() {
682 assert(signal_sets_initialized, "Not initialized");
683 return &unblocked_sigs;
684 }
685
686 // These are the signals that are blocked while a (non-VM) thread is
687 // running Java. Only the VM thread handles these signals.
688 sigset_t* os::Aix::vm_signals() {
689 assert(signal_sets_initialized, "Not initialized");
690 return &vm_sigs;
691 }
692
693 void os::Aix::hotspot_sigmask(Thread* thread) {
694
695 //Save caller's signal mask before setting VM signal mask
696 sigset_t caller_sigmask;
697 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
698
699 OSThread* osthread = thread->osthread();
700 osthread->set_caller_sigmask(caller_sigmask);
701
702 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
703
704 if (!ReduceSignalUsage) {
705 if (thread->is_VM_thread()) {
706 // Only the VM thread handles BREAK_SIGNAL ...
707 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
708 } else {
709 // ... all other threads block BREAK_SIGNAL
710 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
711 }
712 }
713 }
714
715 // retrieve memory information.
716 // Returns false if something went wrong;
717 // content of pmi undefined in this case.
718 bool os::Aix::get_meminfo(meminfo_t* pmi) {
719
720 assert(pmi, "get_meminfo: invalid parameter");
721
722 memset(pmi, 0, sizeof(meminfo_t));
723
724 if (os::Aix::on_pase()) {
725 // On PASE, use the libo4 porting library.
726
727 unsigned long long virt_total = 0;
728 unsigned long long real_total = 0;
729 unsigned long long real_free = 0;
730 unsigned long long pgsp_total = 0;
731 unsigned long long pgsp_free = 0;
732 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
733 pmi->virt_total = virt_total;
734 pmi->real_total = real_total;
735 pmi->real_free = real_free;
736 pmi->pgsp_total = pgsp_total;
737 pmi->pgsp_free = pgsp_free;
738 return true;
739 }
740 return false;
741
742 } else {
743
744 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
745 // See:
746 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
747 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
748 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
749 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
750
751 perfstat_memory_total_t psmt;
752 memset (&psmt, '\0', sizeof(psmt));
753 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
754 if (rc == -1) {
755 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
756 assert(0, "perfstat_memory_total() failed");
757 return false;
758 }
759
760 assert(rc == 1, "perfstat_memory_total() - weird return code");
761
762 // excerpt from
763 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
764 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
765 // The fields of perfstat_memory_total_t:
766 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
767 // u_longlong_t real_total Total real memory (in 4 KB pages).
768 // u_longlong_t real_free Free real memory (in 4 KB pages).
769 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
770 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
771
772 pmi->virt_total = psmt.virt_total * 4096;
773 pmi->real_total = psmt.real_total * 4096;
774 pmi->real_free = psmt.real_free * 4096;
775 pmi->pgsp_total = psmt.pgsp_total * 4096;
776 pmi->pgsp_free = psmt.pgsp_free * 4096;
777
778 return true;
779
780 }
781 } // end os::Aix::get_meminfo
782
783 //////////////////////////////////////////////////////////////////////////////
784 // create new thread
785
786 // Thread start routine for all newly created threads
787 static void *thread_native_entry(Thread *thread) {
788
789 // find out my own stack dimensions
790 {
791 // actually, this should do exactly the same as thread->record_stack_base_and_size...
792 thread->set_stack_base(os::current_stack_base());
793 thread->set_stack_size(os::current_stack_size());
794 }
795
796 const pthread_t pthread_id = ::pthread_self();
797 const tid_t kernel_thread_id = ::thread_self();
798
799 LogTarget(Info, os, thread) lt;
800 if (lt.is_enabled()) {
801 address low_address = thread->stack_end();
802 address high_address = thread->stack_base();
803 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
804 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
805 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
806 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
807 }
808
809 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
810 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
811 // tools hook pthread_create(). In this case, we may run into problems establishing
812 // guard pages on those stacks, because the stacks may reside in memory which is not
813 // protectable (shmated).
814 if (thread->stack_base() > ::sbrk(0)) {
815 log_warning(os, thread)("Thread stack not in data segment.");
816 }
817
818 // Try to randomize the cache line index of hot stack frames.
819 // This helps when threads of the same stack traces evict each other's
820 // cache lines. The threads can be either from the same JVM instance, or
821 // from different JVM instances. The benefit is especially true for
822 // processors with hyperthreading technology.
823
824 static int counter = 0;
825 int pid = os::current_process_id();
826 alloca(((pid ^ counter++) & 7) * 128);
827
828 thread->initialize_thread_current();
829
830 OSThread* osthread = thread->osthread();
831
832 // Thread_id is pthread id.
833 osthread->set_thread_id(pthread_id);
834
835 // .. but keep kernel thread id too for diagnostics
836 osthread->set_kernel_thread_id(kernel_thread_id);
837
838 // Initialize signal mask for this thread.
839 os::Aix::hotspot_sigmask(thread);
840
841 // Initialize floating point control register.
842 os::Aix::init_thread_fpu_state();
843
844 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
845
846 // Call one more level start routine.
847 thread->run();
848
849 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
850 os::current_thread_id(), (uintx) kernel_thread_id);
851
852 // If a thread has not deleted itself ("delete this") as part of its
853 // termination sequence, we have to ensure thread-local-storage is
854 // cleared before we actually terminate. No threads should ever be
855 // deleted asynchronously with respect to their termination.
856 if (Thread::current_or_null_safe() != NULL) {
857 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
858 thread->clear_thread_current();
859 }
860
861 return 0;
862 }
863
864 bool os::create_thread(Thread* thread, ThreadType thr_type,
865 size_t req_stack_size) {
866
867 assert(thread->osthread() == NULL, "caller responsible");
868
869 // Allocate the OSThread object.
870 OSThread* osthread = new OSThread(NULL, NULL);
871 if (osthread == NULL) {
872 return false;
873 }
874
875 // Set the correct thread state.
876 osthread->set_thread_type(thr_type);
877
878 // Initial state is ALLOCATED but not INITIALIZED
879 osthread->set_state(ALLOCATED);
880
881 thread->set_osthread(osthread);
882
883 // Init thread attributes.
884 pthread_attr_t attr;
885 pthread_attr_init(&attr);
886 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
887
888 // Make sure we run in 1:1 kernel-user-thread mode.
889 if (os::Aix::on_aix()) {
890 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
891 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
892 }
893
894 // Start in suspended state, and in os::thread_start, wake the thread up.
895 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
896
897 // Calculate stack size if it's not specified by caller.
898 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
899
900 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
901 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
902 // This very much looks like a pthread lib error. As a workaround, increase the stack size
903 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
904 if (stack_size < 4096 * K) {
905 stack_size += 64 * K;
906 }
907
908 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
909 // thread size in attr unchanged. If this is the minimal stack size as set
910 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
911 // guard pages might not fit on the tiny stack created.
912 int ret = pthread_attr_setstacksize(&attr, stack_size);
913 if (ret != 0) {
914 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
915 stack_size / K);
916 }
917
918 // Save some cycles and a page by disabling OS guard pages where we have our own
919 // VM guard pages (in java threads). For other threads, keep system default guard
920 // pages in place.
921 if (thr_type == java_thread || thr_type == compiler_thread) {
922 ret = pthread_attr_setguardsize(&attr, 0);
923 }
924
925 pthread_t tid = 0;
926 if (ret == 0) {
927 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
928 }
929
930 if (ret == 0) {
931 char buf[64];
932 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
933 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
934 } else {
935 char buf[64];
936 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
937 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
938 }
939
940 pthread_attr_destroy(&attr);
941
942 if (ret != 0) {
943 // Need to clean up stuff we've allocated so far.
944 thread->set_osthread(NULL);
945 delete osthread;
946 return false;
947 }
948
949 // OSThread::thread_id is the pthread id.
950 osthread->set_thread_id(tid);
951
952 return true;
953 }
954
955 /////////////////////////////////////////////////////////////////////////////
956 // attach existing thread
957
958 // bootstrap the main thread
959 bool os::create_main_thread(JavaThread* thread) {
960 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
961 return create_attached_thread(thread);
962 }
963
964 bool os::create_attached_thread(JavaThread* thread) {
965 #ifdef ASSERT
966 thread->verify_not_published();
967 #endif
968
969 // Allocate the OSThread object
970 OSThread* osthread = new OSThread(NULL, NULL);
971
972 if (osthread == NULL) {
973 return false;
974 }
975
976 const pthread_t pthread_id = ::pthread_self();
977 const tid_t kernel_thread_id = ::thread_self();
978
979 // OSThread::thread_id is the pthread id.
980 osthread->set_thread_id(pthread_id);
981
982 // .. but keep kernel thread id too for diagnostics
983 osthread->set_kernel_thread_id(kernel_thread_id);
984
985 // initialize floating point control register
986 os::Aix::init_thread_fpu_state();
987
988 // Initial thread state is RUNNABLE
989 osthread->set_state(RUNNABLE);
990
991 thread->set_osthread(osthread);
992
993 if (UseNUMA) {
994 int lgrp_id = os::numa_get_group_id();
995 if (lgrp_id != -1) {
996 thread->set_lgrp_id(lgrp_id);
997 }
998 }
999
1000 // initialize signal mask for this thread
1001 // and save the caller's signal mask
1002 os::Aix::hotspot_sigmask(thread);
1003
1004 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
1005 os::current_thread_id(), (uintx) kernel_thread_id);
1006
1007 return true;
1008 }
1009
1010 void os::pd_start_thread(Thread* thread) {
1011 int status = pthread_continue_np(thread->osthread()->pthread_id());
1012 assert(status == 0, "thr_continue failed");
1013 }
1014
1015 // Free OS resources related to the OSThread
1016 void os::free_thread(OSThread* osthread) {
1017 assert(osthread != NULL, "osthread not set");
1018
1019 // We are told to free resources of the argument thread,
1020 // but we can only really operate on the current thread.
1021 assert(Thread::current()->osthread() == osthread,
1022 "os::free_thread but not current thread");
1023
1024 // Restore caller's signal mask
1025 sigset_t sigmask = osthread->caller_sigmask();
1026 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1027
1028 delete osthread;
1029 }
1030
1031 ////////////////////////////////////////////////////////////////////////////////
1032 // time support
1033
1034 // Time since start-up in seconds to a fine granularity.
1035 // Used by VMSelfDestructTimer and the MemProfiler.
1036 double os::elapsedTime() {
1037 return (double)(os::elapsed_counter()) * 0.000001;
1038 }
1039
1040 jlong os::elapsed_counter() {
1041 timeval time;
1042 int status = gettimeofday(&time, NULL);
1043 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1044 }
1045
1046 jlong os::elapsed_frequency() {
1047 return (1000 * 1000);
1048 }
1049
1050 bool os::supports_vtime() { return true; }
1051 bool os::enable_vtime() { return false; }
1052 bool os::vtime_enabled() { return false; }
1053
1054 double os::elapsedVTime() {
1055 struct rusage usage;
1056 int retval = getrusage(RUSAGE_THREAD, &usage);
1057 if (retval == 0) {
1058 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1059 } else {
1060 // better than nothing, but not much
1061 return elapsedTime();
1062 }
1063 }
1064
1065 jlong os::javaTimeMillis() {
1066 timeval time;
1067 int status = gettimeofday(&time, NULL);
1068 assert(status != -1, "aix error at gettimeofday()");
1069 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1070 }
1071
1072 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1073 timeval time;
1074 int status = gettimeofday(&time, NULL);
1075 assert(status != -1, "aix error at gettimeofday()");
1076 seconds = jlong(time.tv_sec);
1077 nanos = jlong(time.tv_usec) * 1000;
1078 }
1079
1080 // We use mread_real_time here.
1081 // On AIX: If the CPU has a time register, the result will be RTC_POWER and
1082 // it has to be converted to real time. AIX documentations suggests to do
1083 // this unconditionally, so we do it.
1084 //
1085 // See: https://www.ibm.com/support/knowledgecenter/ssw_aix_61/com.ibm.aix.basetrf2/read_real_time.htm
1086 //
1087 // On PASE: mread_real_time will always return RTC_POWER_PC data, so no
1088 // conversion is necessary. However, mread_real_time will not return
1089 // monotonic results but merely matches read_real_time. So we need a tweak
1090 // to ensure monotonic results.
1091 //
1092 // For PASE no public documentation exists, just word by IBM
1093 jlong os::javaTimeNanos() {
1094 timebasestruct_t time;
1095 int rc = mread_real_time(&time, TIMEBASE_SZ);
1096 if (os::Aix::on_pase()) {
1097 assert(rc == RTC_POWER, "expected time format RTC_POWER from mread_real_time in PASE");
1098 jlong now = jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1099 jlong prev = max_real_time;
1100 if (now <= prev) {
1101 return prev; // same or retrograde time;
1102 }
1103 jlong obsv = Atomic::cmpxchg(now, &max_real_time, prev);
1104 assert(obsv >= prev, "invariant"); // Monotonicity
1105 // If the CAS succeeded then we're done and return "now".
1106 // If the CAS failed and the observed value "obsv" is >= now then
1107 // we should return "obsv". If the CAS failed and now > obsv > prv then
1108 // some other thread raced this thread and installed a new value, in which case
1109 // we could either (a) retry the entire operation, (b) retry trying to install now
1110 // or (c) just return obsv. We use (c). No loop is required although in some cases
1111 // we might discard a higher "now" value in deference to a slightly lower but freshly
1112 // installed obsv value. That's entirely benign -- it admits no new orderings compared
1113 // to (a) or (b) -- and greatly reduces coherence traffic.
1114 // We might also condition (c) on the magnitude of the delta between obsv and now.
1115 // Avoiding excessive CAS operations to hot RW locations is critical.
1116 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate
1117 return (prev == obsv) ? now : obsv;
1118 } else {
1119 if (rc != RTC_POWER) {
1120 rc = time_base_to_time(&time, TIMEBASE_SZ);
1121 assert(rc != -1, "error calling time_base_to_time()");
1122 }
1123 return jlong(time.tb_high) * NANOSECS_PER_SEC + jlong(time.tb_low);
1124 }
1125 }
1126
1127 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1128 info_ptr->max_value = ALL_64_BITS;
1129 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1130 info_ptr->may_skip_backward = false;
1131 info_ptr->may_skip_forward = false;
1132 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1133 }
1134
1135 // Return the real, user, and system times in seconds from an
1136 // arbitrary fixed point in the past.
1137 bool os::getTimesSecs(double* process_real_time,
1138 double* process_user_time,
1139 double* process_system_time) {
1140 struct tms ticks;
1141 clock_t real_ticks = times(&ticks);
1142
1143 if (real_ticks == (clock_t) (-1)) {
1144 return false;
1145 } else {
1146 double ticks_per_second = (double) clock_tics_per_sec;
1147 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1148 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1149 *process_real_time = ((double) real_ticks) / ticks_per_second;
1150
1151 return true;
1152 }
1153 }
1154
1155 char * os::local_time_string(char *buf, size_t buflen) {
1156 struct tm t;
1157 time_t long_time;
1158 time(&long_time);
1159 localtime_r(&long_time, &t);
1160 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1161 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1162 t.tm_hour, t.tm_min, t.tm_sec);
1163 return buf;
1164 }
1165
1166 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1167 return localtime_r(clock, res);
1168 }
1169
1170 ////////////////////////////////////////////////////////////////////////////////
1171 // runtime exit support
1172
1173 // Note: os::shutdown() might be called very early during initialization, or
1174 // called from signal handler. Before adding something to os::shutdown(), make
1175 // sure it is async-safe and can handle partially initialized VM.
1176 void os::shutdown() {
1177
1178 // allow PerfMemory to attempt cleanup of any persistent resources
1179 perfMemory_exit();
1180
1181 // needs to remove object in file system
1182 AttachListener::abort();
1183
1184 // flush buffered output, finish log files
1185 ostream_abort();
1186
1187 // Check for abort hook
1188 abort_hook_t abort_hook = Arguments::abort_hook();
1189 if (abort_hook != NULL) {
1190 abort_hook();
1191 }
1192 }
1193
1194 // Note: os::abort() might be called very early during initialization, or
1195 // called from signal handler. Before adding something to os::abort(), make
1196 // sure it is async-safe and can handle partially initialized VM.
1197 void os::abort(bool dump_core, void* siginfo, const void* context) {
1198 os::shutdown();
1199 if (dump_core) {
1200 #ifndef PRODUCT
1201 fdStream out(defaultStream::output_fd());
1202 out.print_raw("Current thread is ");
1203 char buf[16];
1204 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1205 out.print_raw_cr(buf);
1206 out.print_raw_cr("Dumping core ...");
1207 #endif
1208 ::abort(); // dump core
1209 }
1210
1211 ::exit(1);
1212 }
1213
1214 // Die immediately, no exit hook, no abort hook, no cleanup.
1215 void os::die() {
1216 ::abort();
1217 }
1218
1219 // This method is a copy of JDK's sysGetLastErrorString
1220 // from src/solaris/hpi/src/system_md.c
1221
1222 size_t os::lasterror(char *buf, size_t len) {
1223 if (errno == 0) return 0;
1224
1225 const char *s = os::strerror(errno);
1226 size_t n = ::strlen(s);
1227 if (n >= len) {
1228 n = len - 1;
1229 }
1230 ::strncpy(buf, s, n);
1231 buf[n] = '\0';
1232 return n;
1233 }
1234
1235 intx os::current_thread_id() {
1236 return (intx)pthread_self();
1237 }
1238
1239 int os::current_process_id() {
1240 return getpid();
1241 }
1242
1243 // DLL functions
1244
1245 const char* os::dll_file_extension() { return ".so"; }
1246
1247 // This must be hard coded because it's the system's temporary
1248 // directory not the java application's temp directory, ala java.io.tmpdir.
1249 const char* os::get_temp_directory() { return "/tmp"; }
1250
1251 // Check if addr is inside libjvm.so.
1252 bool os::address_is_in_vm(address addr) {
1253
1254 // Input could be a real pc or a function pointer literal. The latter
1255 // would be a function descriptor residing in the data segment of a module.
1256 loaded_module_t lm;
1257 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1258 return lm.is_in_vm;
1259 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1260 return lm.is_in_vm;
1261 } else {
1262 return false;
1263 }
1264
1265 }
1266
1267 // Resolve an AIX function descriptor literal to a code pointer.
1268 // If the input is a valid code pointer to a text segment of a loaded module,
1269 // it is returned unchanged.
1270 // If the input is a valid AIX function descriptor, it is resolved to the
1271 // code entry point.
1272 // If the input is neither a valid function descriptor nor a valid code pointer,
1273 // NULL is returned.
1274 static address resolve_function_descriptor_to_code_pointer(address p) {
1275
1276 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1277 // It is a real code pointer.
1278 return p;
1279 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1280 // Pointer to data segment, potential function descriptor.
1281 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1282 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1283 // It is a function descriptor.
1284 return code_entry;
1285 }
1286 }
1287
1288 return NULL;
1289 }
1290
1291 bool os::dll_address_to_function_name(address addr, char *buf,
1292 int buflen, int *offset,
1293 bool demangle) {
1294 if (offset) {
1295 *offset = -1;
1296 }
1297 // Buf is not optional, but offset is optional.
1298 assert(buf != NULL, "sanity check");
1299 buf[0] = '\0';
1300
1301 // Resolve function ptr literals first.
1302 addr = resolve_function_descriptor_to_code_pointer(addr);
1303 if (!addr) {
1304 return false;
1305 }
1306
1307 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1308 }
1309
1310 bool os::dll_address_to_library_name(address addr, char* buf,
1311 int buflen, int* offset) {
1312 if (offset) {
1313 *offset = -1;
1314 }
1315 // Buf is not optional, but offset is optional.
1316 assert(buf != NULL, "sanity check");
1317 buf[0] = '\0';
1318
1319 // Resolve function ptr literals first.
1320 addr = resolve_function_descriptor_to_code_pointer(addr);
1321 if (!addr) {
1322 return false;
1323 }
1324
1325 return AixSymbols::get_module_name(addr, buf, buflen);
1326 }
1327
1328 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1329 // for the same architecture as Hotspot is running on.
1330 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1331
1332 if (ebuf && ebuflen > 0) {
1333 ebuf[0] = '\0';
1334 ebuf[ebuflen - 1] = '\0';
1335 }
1336
1337 if (!filename || strlen(filename) == 0) {
1338 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1339 return NULL;
1340 }
1341
1342 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1343 void * result= ::dlopen(filename, RTLD_LAZY);
1344 if (result != NULL) {
1345 // Reload dll cache. Don't do this in signal handling.
1346 LoadedLibraries::reload();
1347 return result;
1348 } else {
1349 // error analysis when dlopen fails
1350 const char* const error_report = ::dlerror();
1351 if (error_report && ebuf && ebuflen > 0) {
1352 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1353 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1354 }
1355 }
1356 return NULL;
1357 }
1358
1359 void* os::dll_lookup(void* handle, const char* name) {
1360 void* res = dlsym(handle, name);
1361 return res;
1362 }
1363
1364 void* os::get_default_process_handle() {
1365 return (void*)::dlopen(NULL, RTLD_LAZY);
1366 }
1367
1368 void os::print_dll_info(outputStream *st) {
1369 st->print_cr("Dynamic libraries:");
1370 LoadedLibraries::print(st);
1371 }
1372
1373 void os::get_summary_os_info(char* buf, size_t buflen) {
1374 // There might be something more readable than uname results for AIX.
1375 struct utsname name;
1376 uname(&name);
1377 snprintf(buf, buflen, "%s %s", name.release, name.version);
1378 }
1379
1380 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
1381 // Not yet implemented.
1382 return 0;
1383 }
1384
1385 void os::print_os_info_brief(outputStream* st) {
1386 uint32_t ver = os::Aix::os_version();
1387 st->print_cr("AIX kernel version %u.%u.%u.%u",
1388 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1389
1390 os::Posix::print_uname_info(st);
1391
1392 // Linux uses print_libversion_info(st); here.
1393 }
1394
1395 void os::print_os_info(outputStream* st) {
1396 st->print("OS:");
1397
1398 st->print("uname:");
1399 struct utsname name;
1400 uname(&name);
1401 st->print(name.sysname); st->print(" ");
1402 st->print(name.nodename); st->print(" ");
1403 st->print(name.release); st->print(" ");
1404 st->print(name.version); st->print(" ");
1405 st->print(name.machine);
1406 st->cr();
1407
1408 uint32_t ver = os::Aix::os_version();
1409 st->print_cr("AIX kernel version %u.%u.%u.%u",
1410 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1411
1412 os::Posix::print_rlimit_info(st);
1413
1414 // load average
1415 st->print("load average:");
1416 double loadavg[3] = {-1.L, -1.L, -1.L};
1417 os::loadavg(loadavg, 3);
1418 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1419 st->cr();
1420
1421 // print wpar info
1422 libperfstat::wparinfo_t wi;
1423 if (libperfstat::get_wparinfo(&wi)) {
1424 st->print_cr("wpar info");
1425 st->print_cr("name: %s", wi.name);
1426 st->print_cr("id: %d", wi.wpar_id);
1427 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1428 }
1429
1430 // print partition info
1431 libperfstat::partitioninfo_t pi;
1432 if (libperfstat::get_partitioninfo(&pi)) {
1433 st->print_cr("partition info");
1434 st->print_cr(" name: %s", pi.name);
1435 }
1436
1437 }
1438
1439 void os::print_memory_info(outputStream* st) {
1440
1441 st->print_cr("Memory:");
1442
1443 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1444 describe_pagesize(g_multipage_support.pagesize));
1445 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1446 describe_pagesize(g_multipage_support.datapsize));
1447 st->print_cr(" Text page size: %s",
1448 describe_pagesize(g_multipage_support.textpsize));
1449 st->print_cr(" Thread stack page size (pthread): %s",
1450 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1451 st->print_cr(" Default shared memory page size: %s",
1452 describe_pagesize(g_multipage_support.shmpsize));
1453 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1454 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1455 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1456 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1457 st->print_cr(" Multipage error: %d",
1458 g_multipage_support.error);
1459 st->cr();
1460 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1461
1462 // print out LDR_CNTRL because it affects the default page sizes
1463 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1464 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1465
1466 // Print out EXTSHM because it is an unsupported setting.
1467 const char* const extshm = ::getenv("EXTSHM");
1468 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1469 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1470 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1471 }
1472
1473 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1474 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1475 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1476 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1477 st->cr();
1478
1479 os::Aix::meminfo_t mi;
1480 if (os::Aix::get_meminfo(&mi)) {
1481 if (os::Aix::on_aix()) {
1482 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1483 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1484 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1485 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1486 } else {
1487 // PASE - Numbers are result of QWCRSSTS; they mean:
1488 // real_total: Sum of all system pools
1489 // real_free: always 0
1490 // pgsp_total: we take the size of the system ASP
1491 // pgsp_free: size of system ASP times percentage of system ASP unused
1492 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1493 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1494 st->print_cr("%% system asp used : %.2f",
1495 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1496 }
1497 }
1498 st->cr();
1499
1500 // Print program break.
1501 st->print_cr("Program break at VM startup: " PTR_FORMAT ".", p2i(g_brk_at_startup));
1502 address brk_now = (address)::sbrk(0);
1503 if (brk_now != (address)-1) {
1504 st->print_cr("Program break now : " PTR_FORMAT " (distance: " SIZE_FORMAT "k).",
1505 p2i(brk_now), (size_t)((brk_now - g_brk_at_startup) / K));
1506 }
1507 st->print_cr("MaxExpectedDataSegmentSize : " SIZE_FORMAT "k.", MaxExpectedDataSegmentSize / K);
1508 st->cr();
1509
1510 // Print segments allocated with os::reserve_memory.
1511 st->print_cr("internal virtual memory regions used by vm:");
1512 vmembk_print_on(st);
1513 }
1514
1515 // Get a string for the cpuinfo that is a summary of the cpu type
1516 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1517 // read _system_configuration.version
1518 switch (_system_configuration.version) {
1519 case PV_8:
1520 strncpy(buf, "Power PC 8", buflen);
1521 break;
1522 case PV_7:
1523 strncpy(buf, "Power PC 7", buflen);
1524 break;
1525 case PV_6_1:
1526 strncpy(buf, "Power PC 6 DD1.x", buflen);
1527 break;
1528 case PV_6:
1529 strncpy(buf, "Power PC 6", buflen);
1530 break;
1531 case PV_5:
1532 strncpy(buf, "Power PC 5", buflen);
1533 break;
1534 case PV_5_2:
1535 strncpy(buf, "Power PC 5_2", buflen);
1536 break;
1537 case PV_5_3:
1538 strncpy(buf, "Power PC 5_3", buflen);
1539 break;
1540 case PV_5_Compat:
1541 strncpy(buf, "PV_5_Compat", buflen);
1542 break;
1543 case PV_6_Compat:
1544 strncpy(buf, "PV_6_Compat", buflen);
1545 break;
1546 case PV_7_Compat:
1547 strncpy(buf, "PV_7_Compat", buflen);
1548 break;
1549 case PV_8_Compat:
1550 strncpy(buf, "PV_8_Compat", buflen);
1551 break;
1552 default:
1553 strncpy(buf, "unknown", buflen);
1554 }
1555 }
1556
1557 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1558 // Nothing to do beyond of what os::print_cpu_info() does.
1559 }
1560
1561 static void print_signal_handler(outputStream* st, int sig,
1562 char* buf, size_t buflen);
1563
1564 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1565 st->print_cr("Signal Handlers:");
1566 print_signal_handler(st, SIGSEGV, buf, buflen);
1567 print_signal_handler(st, SIGBUS , buf, buflen);
1568 print_signal_handler(st, SIGFPE , buf, buflen);
1569 print_signal_handler(st, SIGPIPE, buf, buflen);
1570 print_signal_handler(st, SIGXFSZ, buf, buflen);
1571 print_signal_handler(st, SIGILL , buf, buflen);
1572 print_signal_handler(st, SR_signum, buf, buflen);
1573 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1574 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1575 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1576 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1577 print_signal_handler(st, SIGTRAP, buf, buflen);
1578 // We also want to know if someone else adds a SIGDANGER handler because
1579 // that will interfere with OOM killling.
1580 print_signal_handler(st, SIGDANGER, buf, buflen);
1581 }
1582
1583 static char saved_jvm_path[MAXPATHLEN] = {0};
1584
1585 // Find the full path to the current module, libjvm.so.
1586 void os::jvm_path(char *buf, jint buflen) {
1587 // Error checking.
1588 if (buflen < MAXPATHLEN) {
1589 assert(false, "must use a large-enough buffer");
1590 buf[0] = '\0';
1591 return;
1592 }
1593 // Lazy resolve the path to current module.
1594 if (saved_jvm_path[0] != 0) {
1595 strcpy(buf, saved_jvm_path);
1596 return;
1597 }
1598
1599 Dl_info dlinfo;
1600 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1601 assert(ret != 0, "cannot locate libjvm");
1602 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1603 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1604
1605 if (Arguments::sun_java_launcher_is_altjvm()) {
1606 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1607 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1608 // If "/jre/lib/" appears at the right place in the string, then
1609 // assume we are installed in a JDK and we're done. Otherwise, check
1610 // for a JAVA_HOME environment variable and fix up the path so it
1611 // looks like libjvm.so is installed there (append a fake suffix
1612 // hotspot/libjvm.so).
1613 const char *p = buf + strlen(buf) - 1;
1614 for (int count = 0; p > buf && count < 4; ++count) {
1615 for (--p; p > buf && *p != '/'; --p)
1616 /* empty */ ;
1617 }
1618
1619 if (strncmp(p, "/jre/lib/", 9) != 0) {
1620 // Look for JAVA_HOME in the environment.
1621 char* java_home_var = ::getenv("JAVA_HOME");
1622 if (java_home_var != NULL && java_home_var[0] != 0) {
1623 char* jrelib_p;
1624 int len;
1625
1626 // Check the current module name "libjvm.so".
1627 p = strrchr(buf, '/');
1628 if (p == NULL) {
1629 return;
1630 }
1631 assert(strstr(p, "/libjvm") == p, "invalid library name");
1632
1633 rp = os::Posix::realpath(java_home_var, buf, buflen);
1634 if (rp == NULL) {
1635 return;
1636 }
1637
1638 // determine if this is a legacy image or modules image
1639 // modules image doesn't have "jre" subdirectory
1640 len = strlen(buf);
1641 assert(len < buflen, "Ran out of buffer room");
1642 jrelib_p = buf + len;
1643 snprintf(jrelib_p, buflen-len, "/jre/lib");
1644 if (0 != access(buf, F_OK)) {
1645 snprintf(jrelib_p, buflen-len, "/lib");
1646 }
1647
1648 if (0 == access(buf, F_OK)) {
1649 // Use current module name "libjvm.so"
1650 len = strlen(buf);
1651 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1652 } else {
1653 // Go back to path of .so
1654 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1655 if (rp == NULL) {
1656 return;
1657 }
1658 }
1659 }
1660 }
1661 }
1662
1663 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1664 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1665 }
1666
1667 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1668 // no prefix required, not even "_"
1669 }
1670
1671 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1672 // no suffix required
1673 }
1674
1675 ////////////////////////////////////////////////////////////////////////////////
1676 // sun.misc.Signal support
1677
1678 static volatile jint sigint_count = 0;
1679
1680 static void
1681 UserHandler(int sig, void *siginfo, void *context) {
1682 // 4511530 - sem_post is serialized and handled by the manager thread. When
1683 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1684 // don't want to flood the manager thread with sem_post requests.
1685 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1686 return;
1687
1688 // Ctrl-C is pressed during error reporting, likely because the error
1689 // handler fails to abort. Let VM die immediately.
1690 if (sig == SIGINT && VMError::is_error_reported()) {
1691 os::die();
1692 }
1693
1694 os::signal_notify(sig);
1695 }
1696
1697 void* os::user_handler() {
1698 return CAST_FROM_FN_PTR(void*, UserHandler);
1699 }
1700
1701 extern "C" {
1702 typedef void (*sa_handler_t)(int);
1703 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1704 }
1705
1706 void* os::signal(int signal_number, void* handler) {
1707 struct sigaction sigAct, oldSigAct;
1708
1709 sigfillset(&(sigAct.sa_mask));
1710
1711 // Do not block out synchronous signals in the signal handler.
1712 // Blocking synchronous signals only makes sense if you can really
1713 // be sure that those signals won't happen during signal handling,
1714 // when the blocking applies. Normal signal handlers are lean and
1715 // do not cause signals. But our signal handlers tend to be "risky"
1716 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1717 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1718 // by a SIGILL, which was blocked due to the signal mask. The process
1719 // just hung forever. Better to crash from a secondary signal than to hang.
1720 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1721 sigdelset(&(sigAct.sa_mask), SIGBUS);
1722 sigdelset(&(sigAct.sa_mask), SIGILL);
1723 sigdelset(&(sigAct.sa_mask), SIGFPE);
1724 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1725
1726 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1727
1728 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1729
1730 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1731 // -1 means registration failed
1732 return (void *)-1;
1733 }
1734
1735 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1736 }
1737
1738 void os::signal_raise(int signal_number) {
1739 ::raise(signal_number);
1740 }
1741
1742 //
1743 // The following code is moved from os.cpp for making this
1744 // code platform specific, which it is by its very nature.
1745 //
1746
1747 // Will be modified when max signal is changed to be dynamic
1748 int os::sigexitnum_pd() {
1749 return NSIG;
1750 }
1751
1752 // a counter for each possible signal value
1753 static volatile jint pending_signals[NSIG+1] = { 0 };
1754
1755 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1756 // On AIX, we use sem_init(), sem_post(), sem_wait()
1757 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1758 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1759 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1760 // on AIX, msem_..() calls are suspected of causing problems.
1761 static sem_t sig_sem;
1762 static msemaphore* p_sig_msem = 0;
1763
1764 static void local_sem_init() {
1765 if (os::Aix::on_aix()) {
1766 int rc = ::sem_init(&sig_sem, 0, 0);
1767 guarantee(rc != -1, "sem_init failed");
1768 } else {
1769 // Memory semaphores must live in shared mem.
1770 guarantee0(p_sig_msem == NULL);
1771 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1772 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1773 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1774 }
1775 }
1776
1777 static void local_sem_post() {
1778 static bool warn_only_once = false;
1779 if (os::Aix::on_aix()) {
1780 int rc = ::sem_post(&sig_sem);
1781 if (rc == -1 && !warn_only_once) {
1782 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1783 warn_only_once = true;
1784 }
1785 } else {
1786 guarantee0(p_sig_msem != NULL);
1787 int rc = ::msem_unlock(p_sig_msem, 0);
1788 if (rc == -1 && !warn_only_once) {
1789 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1790 warn_only_once = true;
1791 }
1792 }
1793 }
1794
1795 static void local_sem_wait() {
1796 static bool warn_only_once = false;
1797 if (os::Aix::on_aix()) {
1798 int rc = ::sem_wait(&sig_sem);
1799 if (rc == -1 && !warn_only_once) {
1800 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1801 warn_only_once = true;
1802 }
1803 } else {
1804 guarantee0(p_sig_msem != NULL); // must init before use
1805 int rc = ::msem_lock(p_sig_msem, 0);
1806 if (rc == -1 && !warn_only_once) {
1807 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1808 warn_only_once = true;
1809 }
1810 }
1811 }
1812
1813 void os::signal_init_pd() {
1814 // Initialize signal structures
1815 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1816
1817 // Initialize signal semaphore
1818 local_sem_init();
1819 }
1820
1821 void os::signal_notify(int sig) {
1822 Atomic::inc(&pending_signals[sig]);
1823 local_sem_post();
1824 }
1825
1826 static int check_pending_signals() {
1827 Atomic::store(0, &sigint_count);
1828 for (;;) {
1829 for (int i = 0; i < NSIG + 1; i++) {
1830 jint n = pending_signals[i];
1831 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1832 return i;
1833 }
1834 }
1835 JavaThread *thread = JavaThread::current();
1836 ThreadBlockInVM tbivm(thread);
1837
1838 bool threadIsSuspended;
1839 do {
1840 thread->set_suspend_equivalent();
1841 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1842
1843 local_sem_wait();
1844
1845 // were we externally suspended while we were waiting?
1846 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1847 if (threadIsSuspended) {
1848 //
1849 // The semaphore has been incremented, but while we were waiting
1850 // another thread suspended us. We don't want to continue running
1851 // while suspended because that would surprise the thread that
1852 // suspended us.
1853 //
1854
1855 local_sem_post();
1856
1857 thread->java_suspend_self();
1858 }
1859 } while (threadIsSuspended);
1860 }
1861 }
1862
1863 int os::signal_wait() {
1864 return check_pending_signals();
1865 }
1866
1867 ////////////////////////////////////////////////////////////////////////////////
1868 // Virtual Memory
1869
1870 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1871
1872 #define VMEM_MAPPED 1
1873 #define VMEM_SHMATED 2
1874
1875 struct vmembk_t {
1876 int type; // 1 - mmap, 2 - shmat
1877 char* addr;
1878 size_t size; // Real size, may be larger than usersize.
1879 size_t pagesize; // page size of area
1880 vmembk_t* next;
1881
1882 bool contains_addr(char* p) const {
1883 return p >= addr && p < (addr + size);
1884 }
1885
1886 bool contains_range(char* p, size_t s) const {
1887 return contains_addr(p) && contains_addr(p + s - 1);
1888 }
1889
1890 void print_on(outputStream* os) const {
1891 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1892 " bytes, %d %s pages), %s",
1893 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1894 (type == VMEM_SHMATED ? "shmat" : "mmap")
1895 );
1896 }
1897
1898 // Check that range is a sub range of memory block (or equal to memory block);
1899 // also check that range is fully page aligned to the page size if the block.
1900 void assert_is_valid_subrange(char* p, size_t s) const {
1901 if (!contains_range(p, s)) {
1902 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1903 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1904 p, p + s, addr, addr + size);
1905 guarantee0(false);
1906 }
1907 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1908 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1909 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1910 guarantee0(false);
1911 }
1912 }
1913 };
1914
1915 static struct {
1916 vmembk_t* first;
1917 MiscUtils::CritSect cs;
1918 } vmem;
1919
1920 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1921 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1922 assert0(p);
1923 if (p) {
1924 MiscUtils::AutoCritSect lck(&vmem.cs);
1925 p->addr = addr; p->size = size;
1926 p->pagesize = pagesize;
1927 p->type = type;
1928 p->next = vmem.first;
1929 vmem.first = p;
1930 }
1931 }
1932
1933 static vmembk_t* vmembk_find(char* addr) {
1934 MiscUtils::AutoCritSect lck(&vmem.cs);
1935 for (vmembk_t* p = vmem.first; p; p = p->next) {
1936 if (p->addr <= addr && (p->addr + p->size) > addr) {
1937 return p;
1938 }
1939 }
1940 return NULL;
1941 }
1942
1943 static void vmembk_remove(vmembk_t* p0) {
1944 MiscUtils::AutoCritSect lck(&vmem.cs);
1945 assert0(p0);
1946 assert0(vmem.first); // List should not be empty.
1947 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1948 if (*pp == p0) {
1949 *pp = p0->next;
1950 ::free(p0);
1951 return;
1952 }
1953 }
1954 assert0(false); // Not found?
1955 }
1956
1957 static void vmembk_print_on(outputStream* os) {
1958 MiscUtils::AutoCritSect lck(&vmem.cs);
1959 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1960 vmi->print_on(os);
1961 os->cr();
1962 }
1963 }
1964
1965 // Reserve and attach a section of System V memory.
1966 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1967 // address. Failing that, it will attach the memory anywhere.
1968 // If <requested_addr> is NULL, function will attach the memory anywhere.
1969 //
1970 // <alignment_hint> is being ignored by this function. It is very probable however that the
1971 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1972 // Should this be not enogh, we can put more work into it.
1973 static char* reserve_shmated_memory (
1974 size_t bytes,
1975 char* requested_addr,
1976 size_t alignment_hint) {
1977
1978 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1979 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1980 bytes, requested_addr, alignment_hint);
1981
1982 // Either give me wish address or wish alignment but not both.
1983 assert0(!(requested_addr != NULL && alignment_hint != 0));
1984
1985 // We must prevent anyone from attaching too close to the
1986 // BRK because that may cause malloc OOM.
1987 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1988 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1989 "Will attach anywhere.", requested_addr);
1990 // Act like the OS refused to attach there.
1991 requested_addr = NULL;
1992 }
1993
1994 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1995 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1996 if (os::Aix::on_pase_V5R4_or_older()) {
1997 ShouldNotReachHere();
1998 }
1999
2000 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
2001 const size_t size = align_up(bytes, 64*K);
2002
2003 // Reserve the shared segment.
2004 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
2005 if (shmid == -1) {
2006 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
2007 return NULL;
2008 }
2009
2010 // Important note:
2011 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
2012 // We must right after attaching it remove it from the system. System V shm segments are global and
2013 // survive the process.
2014 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
2015
2016 struct shmid_ds shmbuf;
2017 memset(&shmbuf, 0, sizeof(shmbuf));
2018 shmbuf.shm_pagesize = 64*K;
2019 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
2020 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
2021 size / (64*K), errno);
2022 // I want to know if this ever happens.
2023 assert(false, "failed to set page size for shmat");
2024 }
2025
2026 // Now attach the shared segment.
2027 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
2028 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
2029 // were not a segment boundary.
2030 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
2031 const int errno_shmat = errno;
2032
2033 // (A) Right after shmat and before handing shmat errors delete the shm segment.
2034 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
2035 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
2036 assert(false, "failed to remove shared memory segment!");
2037 }
2038
2039 // Handle shmat error. If we failed to attach, just return.
2040 if (addr == (char*)-1) {
2041 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
2042 return NULL;
2043 }
2044
2045 // Just for info: query the real page size. In case setting the page size did not
2046 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2047 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2048 if (real_pagesize != shmbuf.shm_pagesize) {
2049 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2050 }
2051
2052 if (addr) {
2053 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2054 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2055 } else {
2056 if (requested_addr != NULL) {
2057 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2058 } else {
2059 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2060 }
2061 }
2062
2063 // book-keeping
2064 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2065 assert0(is_aligned_to(addr, os::vm_page_size()));
2066
2067 return addr;
2068 }
2069
2070 static bool release_shmated_memory(char* addr, size_t size) {
2071
2072 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2073 addr, addr + size - 1);
2074
2075 bool rc = false;
2076
2077 // TODO: is there a way to verify shm size without doing bookkeeping?
2078 if (::shmdt(addr) != 0) {
2079 trcVerbose("error (%d).", errno);
2080 } else {
2081 trcVerbose("ok.");
2082 rc = true;
2083 }
2084 return rc;
2085 }
2086
2087 static bool uncommit_shmated_memory(char* addr, size_t size) {
2088 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2089 addr, addr + size - 1);
2090
2091 const bool rc = my_disclaim64(addr, size);
2092
2093 if (!rc) {
2094 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2095 return false;
2096 }
2097 return true;
2098 }
2099
2100 //////////////////////////////// mmap-based routines /////////////////////////////////
2101
2102 // Reserve memory via mmap.
2103 // If <requested_addr> is given, an attempt is made to attach at the given address.
2104 // Failing that, memory is allocated at any address.
2105 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2106 // allocate at an address aligned with the given alignment. Failing that, memory
2107 // is aligned anywhere.
2108 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2109 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2110 "alignment_hint " UINTX_FORMAT "...",
2111 bytes, requested_addr, alignment_hint);
2112
2113 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2114 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2115 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2116 return NULL;
2117 }
2118
2119 // We must prevent anyone from attaching too close to the
2120 // BRK because that may cause malloc OOM.
2121 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2122 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2123 "Will attach anywhere.", requested_addr);
2124 // Act like the OS refused to attach there.
2125 requested_addr = NULL;
2126 }
2127
2128 // Specify one or the other but not both.
2129 assert0(!(requested_addr != NULL && alignment_hint > 0));
2130
2131 // In 64K mode, we claim the global page size (os::vm_page_size())
2132 // is 64K. This is one of the few points where that illusion may
2133 // break, because mmap() will always return memory aligned to 4K. So
2134 // we must ensure we only ever return memory aligned to 64k.
2135 if (alignment_hint) {
2136 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2137 } else {
2138 alignment_hint = os::vm_page_size();
2139 }
2140
2141 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2142 const size_t size = align_up(bytes, os::vm_page_size());
2143
2144 // alignment: Allocate memory large enough to include an aligned range of the right size and
2145 // cut off the leading and trailing waste pages.
2146 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2147 const size_t extra_size = size + alignment_hint;
2148
2149 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2150 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2151 int flags = MAP_ANONYMOUS | MAP_SHARED;
2152
2153 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2154 // it means if wishaddress is given but MAP_FIXED is not set.
2155 //
2156 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2157 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2158 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2159 // get clobbered.
2160 if (requested_addr != NULL) {
2161 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2162 flags |= MAP_FIXED;
2163 }
2164 }
2165
2166 char* addr = (char*)::mmap(requested_addr, extra_size,
2167 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2168
2169 if (addr == MAP_FAILED) {
2170 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2171 return NULL;
2172 }
2173
2174 // Handle alignment.
2175 char* const addr_aligned = align_up(addr, alignment_hint);
2176 const size_t waste_pre = addr_aligned - addr;
2177 char* const addr_aligned_end = addr_aligned + size;
2178 const size_t waste_post = extra_size - waste_pre - size;
2179 if (waste_pre > 0) {
2180 ::munmap(addr, waste_pre);
2181 }
2182 if (waste_post > 0) {
2183 ::munmap(addr_aligned_end, waste_post);
2184 }
2185 addr = addr_aligned;
2186
2187 if (addr) {
2188 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2189 addr, addr + bytes, bytes);
2190 } else {
2191 if (requested_addr != NULL) {
2192 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2193 } else {
2194 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2195 }
2196 }
2197
2198 // bookkeeping
2199 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2200
2201 // Test alignment, see above.
2202 assert0(is_aligned_to(addr, os::vm_page_size()));
2203
2204 return addr;
2205 }
2206
2207 static bool release_mmaped_memory(char* addr, size_t size) {
2208 assert0(is_aligned_to(addr, os::vm_page_size()));
2209 assert0(is_aligned_to(size, os::vm_page_size()));
2210
2211 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2212 addr, addr + size - 1);
2213 bool rc = false;
2214
2215 if (::munmap(addr, size) != 0) {
2216 trcVerbose("failed (%d)\n", errno);
2217 rc = false;
2218 } else {
2219 trcVerbose("ok.");
2220 rc = true;
2221 }
2222
2223 return rc;
2224 }
2225
2226 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2227
2228 assert0(is_aligned_to(addr, os::vm_page_size()));
2229 assert0(is_aligned_to(size, os::vm_page_size()));
2230
2231 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2232 addr, addr + size - 1);
2233 bool rc = false;
2234
2235 // Uncommit mmap memory with msync MS_INVALIDATE.
2236 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2237 trcVerbose("failed (%d)\n", errno);
2238 rc = false;
2239 } else {
2240 trcVerbose("ok.");
2241 rc = true;
2242 }
2243
2244 return rc;
2245 }
2246
2247 int os::vm_page_size() {
2248 // Seems redundant as all get out.
2249 assert(os::Aix::page_size() != -1, "must call os::init");
2250 return os::Aix::page_size();
2251 }
2252
2253 // Aix allocates memory by pages.
2254 int os::vm_allocation_granularity() {
2255 assert(os::Aix::page_size() != -1, "must call os::init");
2256 return os::Aix::page_size();
2257 }
2258
2259 #ifdef PRODUCT
2260 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2261 int err) {
2262 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2263 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2264 os::errno_name(err), err);
2265 }
2266 #endif
2267
2268 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2269 const char* mesg) {
2270 assert(mesg != NULL, "mesg must be specified");
2271 if (!pd_commit_memory(addr, size, exec)) {
2272 // Add extra info in product mode for vm_exit_out_of_memory():
2273 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2274 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2275 }
2276 }
2277
2278 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2279
2280 assert(is_aligned_to(addr, os::vm_page_size()),
2281 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2282 p2i(addr), os::vm_page_size());
2283 assert(is_aligned_to(size, os::vm_page_size()),
2284 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2285 size, os::vm_page_size());
2286
2287 vmembk_t* const vmi = vmembk_find(addr);
2288 guarantee0(vmi);
2289 vmi->assert_is_valid_subrange(addr, size);
2290
2291 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2292
2293 if (UseExplicitCommit) {
2294 // AIX commits memory on touch. So, touch all pages to be committed.
2295 for (char* p = addr; p < (addr + size); p += 4*K) {
2296 *p = '\0';
2297 }
2298 }
2299
2300 return true;
2301 }
2302
2303 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2304 return pd_commit_memory(addr, size, exec);
2305 }
2306
2307 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2308 size_t alignment_hint, bool exec,
2309 const char* mesg) {
2310 // Alignment_hint is ignored on this OS.
2311 pd_commit_memory_or_exit(addr, size, exec, mesg);
2312 }
2313
2314 bool os::pd_uncommit_memory(char* addr, size_t size) {
2315 assert(is_aligned_to(addr, os::vm_page_size()),
2316 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2317 p2i(addr), os::vm_page_size());
2318 assert(is_aligned_to(size, os::vm_page_size()),
2319 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2320 size, os::vm_page_size());
2321
2322 // Dynamically do different things for mmap/shmat.
2323 const vmembk_t* const vmi = vmembk_find(addr);
2324 guarantee0(vmi);
2325 vmi->assert_is_valid_subrange(addr, size);
2326
2327 if (vmi->type == VMEM_SHMATED) {
2328 return uncommit_shmated_memory(addr, size);
2329 } else {
2330 return uncommit_mmaped_memory(addr, size);
2331 }
2332 }
2333
2334 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2335 // Do not call this; no need to commit stack pages on AIX.
2336 ShouldNotReachHere();
2337 return true;
2338 }
2339
2340 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2341 // Do not call this; no need to commit stack pages on AIX.
2342 ShouldNotReachHere();
2343 return true;
2344 }
2345
2346 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2347 }
2348
2349 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2350 }
2351
2352 void os::numa_make_global(char *addr, size_t bytes) {
2353 }
2354
2355 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2356 }
2357
2358 bool os::numa_topology_changed() {
2359 return false;
2360 }
2361
2362 size_t os::numa_get_groups_num() {
2363 return 1;
2364 }
2365
2366 int os::numa_get_group_id() {
2367 return 0;
2368 }
2369
2370 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2371 if (size > 0) {
2372 ids[0] = 0;
2373 return 1;
2374 }
2375 return 0;
2376 }
2377
2378 bool os::get_page_info(char *start, page_info* info) {
2379 return false;
2380 }
2381
2382 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2383 return end;
2384 }
2385
2386 // Reserves and attaches a shared memory segment.
2387 // Will assert if a wish address is given and could not be obtained.
2388 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2389
2390 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2391 // thereby clobbering old mappings at that place. That is probably
2392 // not intended, never used and almost certainly an error were it
2393 // ever be used this way (to try attaching at a specified address
2394 // without clobbering old mappings an alternate API exists,
2395 // os::attempt_reserve_memory_at()).
2396 // Instead of mimicking the dangerous coding of the other platforms, here I
2397 // just ignore the request address (release) or assert(debug).
2398 assert0(requested_addr == NULL);
2399
2400 // Always round to os::vm_page_size(), which may be larger than 4K.
2401 bytes = align_up(bytes, os::vm_page_size());
2402 const size_t alignment_hint0 =
2403 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2404
2405 // In 4K mode always use mmap.
2406 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2407 if (os::vm_page_size() == 4*K) {
2408 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2409 } else {
2410 if (bytes >= Use64KPagesThreshold) {
2411 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2412 } else {
2413 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2414 }
2415 }
2416 }
2417
2418 bool os::pd_release_memory(char* addr, size_t size) {
2419
2420 // Dynamically do different things for mmap/shmat.
2421 vmembk_t* const vmi = vmembk_find(addr);
2422 guarantee0(vmi);
2423
2424 // Always round to os::vm_page_size(), which may be larger than 4K.
2425 size = align_up(size, os::vm_page_size());
2426 addr = align_up(addr, os::vm_page_size());
2427
2428 bool rc = false;
2429 bool remove_bookkeeping = false;
2430 if (vmi->type == VMEM_SHMATED) {
2431 // For shmatted memory, we do:
2432 // - If user wants to release the whole range, release the memory (shmdt).
2433 // - If user only wants to release a partial range, uncommit (disclaim) that
2434 // range. That way, at least, we do not use memory anymore (bust still page
2435 // table space).
2436 vmi->assert_is_valid_subrange(addr, size);
2437 if (addr == vmi->addr && size == vmi->size) {
2438 rc = release_shmated_memory(addr, size);
2439 remove_bookkeeping = true;
2440 } else {
2441 rc = uncommit_shmated_memory(addr, size);
2442 }
2443 } else {
2444 // User may unmap partial regions but region has to be fully contained.
2445 #ifdef ASSERT
2446 vmi->assert_is_valid_subrange(addr, size);
2447 #endif
2448 rc = release_mmaped_memory(addr, size);
2449 remove_bookkeeping = true;
2450 }
2451
2452 // update bookkeeping
2453 if (rc && remove_bookkeeping) {
2454 vmembk_remove(vmi);
2455 }
2456
2457 return rc;
2458 }
2459
2460 static bool checked_mprotect(char* addr, size_t size, int prot) {
2461
2462 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2463 // not tell me if protection failed when trying to protect an un-protectable range.
2464 //
2465 // This means if the memory was allocated using shmget/shmat, protection wont work
2466 // but mprotect will still return 0:
2467 //
2468 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2469
2470 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2471
2472 if (!rc) {
2473 const char* const s_errno = os::errno_name(errno);
2474 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2475 return false;
2476 }
2477
2478 // mprotect success check
2479 //
2480 // Mprotect said it changed the protection but can I believe it?
2481 //
2482 // To be sure I need to check the protection afterwards. Try to
2483 // read from protected memory and check whether that causes a segfault.
2484 //
2485 if (!os::Aix::xpg_sus_mode()) {
2486
2487 if (CanUseSafeFetch32()) {
2488
2489 const bool read_protected =
2490 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2491 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2492
2493 if (prot & PROT_READ) {
2494 rc = !read_protected;
2495 } else {
2496 rc = read_protected;
2497 }
2498
2499 if (!rc) {
2500 if (os::Aix::on_pase()) {
2501 // There is an issue on older PASE systems where mprotect() will return success but the
2502 // memory will not be protected.
2503 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2504 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2505 // a stack. It is an OS error.
2506 //
2507 // A valid strategy is just to try again. This usually works. :-/
2508
2509 ::usleep(1000);
2510 if (::mprotect(addr, size, prot) == 0) {
2511 const bool read_protected_2 =
2512 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2513 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2514 rc = true;
2515 }
2516 }
2517 }
2518 }
2519 }
2520
2521 assert(rc == true, "mprotect failed.");
2522
2523 return rc;
2524 }
2525
2526 // Set protections specified
2527 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2528 unsigned int p = 0;
2529 switch (prot) {
2530 case MEM_PROT_NONE: p = PROT_NONE; break;
2531 case MEM_PROT_READ: p = PROT_READ; break;
2532 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2533 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2534 default:
2535 ShouldNotReachHere();
2536 }
2537 // is_committed is unused.
2538 return checked_mprotect(addr, size, p);
2539 }
2540
2541 bool os::guard_memory(char* addr, size_t size) {
2542 return checked_mprotect(addr, size, PROT_NONE);
2543 }
2544
2545 bool os::unguard_memory(char* addr, size_t size) {
2546 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2547 }
2548
2549 // Large page support
2550
2551 static size_t _large_page_size = 0;
2552
2553 // Enable large page support if OS allows that.
2554 void os::large_page_init() {
2555 return; // Nothing to do. See query_multipage_support and friends.
2556 }
2557
2558 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2559 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2560 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2561 // so this is not needed.
2562 assert(false, "should not be called on AIX");
2563 return NULL;
2564 }
2565
2566 bool os::release_memory_special(char* base, size_t bytes) {
2567 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2568 Unimplemented();
2569 return false;
2570 }
2571
2572 size_t os::large_page_size() {
2573 return _large_page_size;
2574 }
2575
2576 bool os::can_commit_large_page_memory() {
2577 // Does not matter, we do not support huge pages.
2578 return false;
2579 }
2580
2581 bool os::can_execute_large_page_memory() {
2582 // Does not matter, we do not support huge pages.
2583 return false;
2584 }
2585
2586 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2587 assert(file_desc >= 0, "file_desc is not valid");
2588 char* result = NULL;
2589
2590 // Always round to os::vm_page_size(), which may be larger than 4K.
2591 bytes = align_up(bytes, os::vm_page_size());
2592 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2593
2594 if (result != NULL) {
2595 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2596 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2597 }
2598 }
2599 return result;
2600 }
2601
2602 // Reserve memory at an arbitrary address, only if that area is
2603 // available (and not reserved for something else).
2604 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2605 char* addr = NULL;
2606
2607 // Always round to os::vm_page_size(), which may be larger than 4K.
2608 bytes = align_up(bytes, os::vm_page_size());
2609
2610 // In 4K mode always use mmap.
2611 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2612 if (os::vm_page_size() == 4*K) {
2613 return reserve_mmaped_memory(bytes, requested_addr, 0);
2614 } else {
2615 if (bytes >= Use64KPagesThreshold) {
2616 return reserve_shmated_memory(bytes, requested_addr, 0);
2617 } else {
2618 return reserve_mmaped_memory(bytes, requested_addr, 0);
2619 }
2620 }
2621
2622 return addr;
2623 }
2624
2625 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2626 return ::read(fd, buf, nBytes);
2627 }
2628
2629 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2630 return ::pread(fd, buf, nBytes, offset);
2631 }
2632
2633 void os::naked_short_sleep(jlong ms) {
2634 struct timespec req;
2635
2636 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2637 req.tv_sec = 0;
2638 if (ms > 0) {
2639 req.tv_nsec = (ms % 1000) * 1000000;
2640 }
2641 else {
2642 req.tv_nsec = 1;
2643 }
2644
2645 nanosleep(&req, NULL);
2646
2647 return;
2648 }
2649
2650 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2651 void os::infinite_sleep() {
2652 while (true) { // sleep forever ...
2653 ::sleep(100); // ... 100 seconds at a time
2654 }
2655 }
2656
2657 // Used to convert frequent JVM_Yield() to nops
2658 bool os::dont_yield() {
2659 return DontYieldALot;
2660 }
2661
2662 void os::naked_yield() {
2663 sched_yield();
2664 }
2665
2666 ////////////////////////////////////////////////////////////////////////////////
2667 // thread priority support
2668
2669 // From AIX manpage to pthread_setschedparam
2670 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2671 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2672 //
2673 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2674 // range from 40 to 80, where 40 is the least favored priority and 80
2675 // is the most favored."
2676 //
2677 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2678 // scheduling there; however, this still leaves iSeries.)
2679 //
2680 // We use the same values for AIX and PASE.
2681 int os::java_to_os_priority[CriticalPriority + 1] = {
2682 54, // 0 Entry should never be used
2683
2684 55, // 1 MinPriority
2685 55, // 2
2686 56, // 3
2687
2688 56, // 4
2689 57, // 5 NormPriority
2690 57, // 6
2691
2692 58, // 7
2693 58, // 8
2694 59, // 9 NearMaxPriority
2695
2696 60, // 10 MaxPriority
2697
2698 60 // 11 CriticalPriority
2699 };
2700
2701 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2702 if (!UseThreadPriorities) return OS_OK;
2703 pthread_t thr = thread->osthread()->pthread_id();
2704 int policy = SCHED_OTHER;
2705 struct sched_param param;
2706 param.sched_priority = newpri;
2707 int ret = pthread_setschedparam(thr, policy, ¶m);
2708
2709 if (ret != 0) {
2710 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2711 (int)thr, newpri, ret, os::errno_name(ret));
2712 }
2713 return (ret == 0) ? OS_OK : OS_ERR;
2714 }
2715
2716 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2717 if (!UseThreadPriorities) {
2718 *priority_ptr = java_to_os_priority[NormPriority];
2719 return OS_OK;
2720 }
2721 pthread_t thr = thread->osthread()->pthread_id();
2722 int policy = SCHED_OTHER;
2723 struct sched_param param;
2724 int ret = pthread_getschedparam(thr, &policy, ¶m);
2725 *priority_ptr = param.sched_priority;
2726
2727 return (ret == 0) ? OS_OK : OS_ERR;
2728 }
2729
2730 // Hint to the underlying OS that a task switch would not be good.
2731 // Void return because it's a hint and can fail.
2732 void os::hint_no_preempt() {}
2733
2734 ////////////////////////////////////////////////////////////////////////////////
2735 // suspend/resume support
2736
2737 // The low-level signal-based suspend/resume support is a remnant from the
2738 // old VM-suspension that used to be for java-suspension, safepoints etc,
2739 // within hotspot. Currently used by JFR's OSThreadSampler
2740 //
2741 // The remaining code is greatly simplified from the more general suspension
2742 // code that used to be used.
2743 //
2744 // The protocol is quite simple:
2745 // - suspend:
2746 // - sends a signal to the target thread
2747 // - polls the suspend state of the osthread using a yield loop
2748 // - target thread signal handler (SR_handler) sets suspend state
2749 // and blocks in sigsuspend until continued
2750 // - resume:
2751 // - sets target osthread state to continue
2752 // - sends signal to end the sigsuspend loop in the SR_handler
2753 //
2754 // Note that the SR_lock plays no role in this suspend/resume protocol,
2755 // but is checked for NULL in SR_handler as a thread termination indicator.
2756 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2757 //
2758 // Note that resume_clear_context() and suspend_save_context() are needed
2759 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2760 // which in part is used by:
2761 // - Forte Analyzer: AsyncGetCallTrace()
2762 // - StackBanging: get_frame_at_stack_banging_point()
2763
2764 static void resume_clear_context(OSThread *osthread) {
2765 osthread->set_ucontext(NULL);
2766 osthread->set_siginfo(NULL);
2767 }
2768
2769 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2770 osthread->set_ucontext(context);
2771 osthread->set_siginfo(siginfo);
2772 }
2773
2774 //
2775 // Handler function invoked when a thread's execution is suspended or
2776 // resumed. We have to be careful that only async-safe functions are
2777 // called here (Note: most pthread functions are not async safe and
2778 // should be avoided.)
2779 //
2780 // Note: sigwait() is a more natural fit than sigsuspend() from an
2781 // interface point of view, but sigwait() prevents the signal hander
2782 // from being run. libpthread would get very confused by not having
2783 // its signal handlers run and prevents sigwait()'s use with the
2784 // mutex granting granting signal.
2785 //
2786 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2787 //
2788 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2789 // Save and restore errno to avoid confusing native code with EINTR
2790 // after sigsuspend.
2791 int old_errno = errno;
2792
2793 Thread* thread = Thread::current_or_null_safe();
2794 assert(thread != NULL, "Missing current thread in SR_handler");
2795
2796 // On some systems we have seen signal delivery get "stuck" until the signal
2797 // mask is changed as part of thread termination. Check that the current thread
2798 // has not already terminated (via SR_lock()) - else the following assertion
2799 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2800 // destructor has completed.
2801
2802 if (thread->SR_lock() == NULL) {
2803 return;
2804 }
2805
2806 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2807
2808 OSThread* osthread = thread->osthread();
2809
2810 os::SuspendResume::State current = osthread->sr.state();
2811 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2812 suspend_save_context(osthread, siginfo, context);
2813
2814 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2815 os::SuspendResume::State state = osthread->sr.suspended();
2816 if (state == os::SuspendResume::SR_SUSPENDED) {
2817 sigset_t suspend_set; // signals for sigsuspend()
2818
2819 // get current set of blocked signals and unblock resume signal
2820 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2821 sigdelset(&suspend_set, SR_signum);
2822
2823 // wait here until we are resumed
2824 while (1) {
2825 sigsuspend(&suspend_set);
2826
2827 os::SuspendResume::State result = osthread->sr.running();
2828 if (result == os::SuspendResume::SR_RUNNING) {
2829 break;
2830 }
2831 }
2832
2833 } else if (state == os::SuspendResume::SR_RUNNING) {
2834 // request was cancelled, continue
2835 } else {
2836 ShouldNotReachHere();
2837 }
2838
2839 resume_clear_context(osthread);
2840 } else if (current == os::SuspendResume::SR_RUNNING) {
2841 // request was cancelled, continue
2842 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2843 // ignore
2844 } else {
2845 ShouldNotReachHere();
2846 }
2847
2848 errno = old_errno;
2849 }
2850
2851 static int SR_initialize() {
2852 struct sigaction act;
2853 char *s;
2854 // Get signal number to use for suspend/resume
2855 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2856 int sig = ::strtol(s, 0, 10);
2857 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2858 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2859 SR_signum = sig;
2860 } else {
2861 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2862 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2863 }
2864 }
2865
2866 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2867 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2868
2869 sigemptyset(&SR_sigset);
2870 sigaddset(&SR_sigset, SR_signum);
2871
2872 // Set up signal handler for suspend/resume.
2873 act.sa_flags = SA_RESTART|SA_SIGINFO;
2874 act.sa_handler = (void (*)(int)) SR_handler;
2875
2876 // SR_signum is blocked by default.
2877 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2878
2879 if (sigaction(SR_signum, &act, 0) == -1) {
2880 return -1;
2881 }
2882
2883 // Save signal flag
2884 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2885 return 0;
2886 }
2887
2888 static int SR_finalize() {
2889 return 0;
2890 }
2891
2892 static int sr_notify(OSThread* osthread) {
2893 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2894 assert_status(status == 0, status, "pthread_kill");
2895 return status;
2896 }
2897
2898 // "Randomly" selected value for how long we want to spin
2899 // before bailing out on suspending a thread, also how often
2900 // we send a signal to a thread we want to resume
2901 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2902 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2903
2904 // returns true on success and false on error - really an error is fatal
2905 // but this seems the normal response to library errors
2906 static bool do_suspend(OSThread* osthread) {
2907 assert(osthread->sr.is_running(), "thread should be running");
2908 // mark as suspended and send signal
2909
2910 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2911 // failed to switch, state wasn't running?
2912 ShouldNotReachHere();
2913 return false;
2914 }
2915
2916 if (sr_notify(osthread) != 0) {
2917 // try to cancel, switch to running
2918
2919 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2920 if (result == os::SuspendResume::SR_RUNNING) {
2921 // cancelled
2922 return false;
2923 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2924 // somehow managed to suspend
2925 return true;
2926 } else {
2927 ShouldNotReachHere();
2928 return false;
2929 }
2930 }
2931
2932 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2933
2934 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2935 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2936 os::naked_yield();
2937 }
2938
2939 // timeout, try to cancel the request
2940 if (n >= RANDOMLY_LARGE_INTEGER) {
2941 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2942 if (cancelled == os::SuspendResume::SR_RUNNING) {
2943 return false;
2944 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2945 return true;
2946 } else {
2947 ShouldNotReachHere();
2948 return false;
2949 }
2950 }
2951 }
2952
2953 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2954 return true;
2955 }
2956
2957 static void do_resume(OSThread* osthread) {
2958 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2959
2960 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2961 // failed to switch to WAKEUP_REQUEST
2962 ShouldNotReachHere();
2963 return;
2964 }
2965
2966 while (!osthread->sr.is_running()) {
2967 if (sr_notify(osthread) == 0) {
2968 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2969 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2970 os::naked_yield();
2971 }
2972 }
2973 } else {
2974 ShouldNotReachHere();
2975 }
2976 }
2977
2978 guarantee(osthread->sr.is_running(), "Must be running!");
2979 }
2980
2981 ///////////////////////////////////////////////////////////////////////////////////
2982 // signal handling (except suspend/resume)
2983
2984 // This routine may be used by user applications as a "hook" to catch signals.
2985 // The user-defined signal handler must pass unrecognized signals to this
2986 // routine, and if it returns true (non-zero), then the signal handler must
2987 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2988 // routine will never retun false (zero), but instead will execute a VM panic
2989 // routine kill the process.
2990 //
2991 // If this routine returns false, it is OK to call it again. This allows
2992 // the user-defined signal handler to perform checks either before or after
2993 // the VM performs its own checks. Naturally, the user code would be making
2994 // a serious error if it tried to handle an exception (such as a null check
2995 // or breakpoint) that the VM was generating for its own correct operation.
2996 //
2997 // This routine may recognize any of the following kinds of signals:
2998 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2999 // It should be consulted by handlers for any of those signals.
3000 //
3001 // The caller of this routine must pass in the three arguments supplied
3002 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
3003 // field of the structure passed to sigaction(). This routine assumes that
3004 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
3005 //
3006 // Note that the VM will print warnings if it detects conflicting signal
3007 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
3008 //
3009 extern "C" JNIEXPORT int
3010 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
3011
3012 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
3013 // to be the thing to call; documentation is not terribly clear about whether
3014 // pthread_sigmask also works, and if it does, whether it does the same.
3015 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
3016 const int rc = ::pthread_sigmask(how, set, oset);
3017 // return value semantics differ slightly for error case:
3018 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
3019 // (so, pthread_sigmask is more theadsafe for error handling)
3020 // But success is always 0.
3021 return rc == 0 ? true : false;
3022 }
3023
3024 // Function to unblock all signals which are, according
3025 // to POSIX, typical program error signals. If they happen while being blocked,
3026 // they typically will bring down the process immediately.
3027 bool unblock_program_error_signals() {
3028 sigset_t set;
3029 ::sigemptyset(&set);
3030 ::sigaddset(&set, SIGILL);
3031 ::sigaddset(&set, SIGBUS);
3032 ::sigaddset(&set, SIGFPE);
3033 ::sigaddset(&set, SIGSEGV);
3034 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
3035 }
3036
3037 // Renamed from 'signalHandler' to avoid collision with other shared libs.
3038 static void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
3039 assert(info != NULL && uc != NULL, "it must be old kernel");
3040
3041 // Never leave program error signals blocked;
3042 // on all our platforms they would bring down the process immediately when
3043 // getting raised while being blocked.
3044 unblock_program_error_signals();
3045
3046 int orig_errno = errno; // Preserve errno value over signal handler.
3047 JVM_handle_aix_signal(sig, info, uc, true);
3048 errno = orig_errno;
3049 }
3050
3051 // This boolean allows users to forward their own non-matching signals
3052 // to JVM_handle_aix_signal, harmlessly.
3053 bool os::Aix::signal_handlers_are_installed = false;
3054
3055 // For signal-chaining
3056 struct sigaction sigact[NSIG];
3057 sigset_t sigs;
3058 bool os::Aix::libjsig_is_loaded = false;
3059 typedef struct sigaction *(*get_signal_t)(int);
3060 get_signal_t os::Aix::get_signal_action = NULL;
3061
3062 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3063 struct sigaction *actp = NULL;
3064
3065 if (libjsig_is_loaded) {
3066 // Retrieve the old signal handler from libjsig
3067 actp = (*get_signal_action)(sig);
3068 }
3069 if (actp == NULL) {
3070 // Retrieve the preinstalled signal handler from jvm
3071 actp = get_preinstalled_handler(sig);
3072 }
3073
3074 return actp;
3075 }
3076
3077 static bool call_chained_handler(struct sigaction *actp, int sig,
3078 siginfo_t *siginfo, void *context) {
3079 // Call the old signal handler
3080 if (actp->sa_handler == SIG_DFL) {
3081 // It's more reasonable to let jvm treat it as an unexpected exception
3082 // instead of taking the default action.
3083 return false;
3084 } else if (actp->sa_handler != SIG_IGN) {
3085 if ((actp->sa_flags & SA_NODEFER) == 0) {
3086 // automaticlly block the signal
3087 sigaddset(&(actp->sa_mask), sig);
3088 }
3089
3090 sa_handler_t hand = NULL;
3091 sa_sigaction_t sa = NULL;
3092 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3093 // retrieve the chained handler
3094 if (siginfo_flag_set) {
3095 sa = actp->sa_sigaction;
3096 } else {
3097 hand = actp->sa_handler;
3098 }
3099
3100 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3101 actp->sa_handler = SIG_DFL;
3102 }
3103
3104 // try to honor the signal mask
3105 sigset_t oset;
3106 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3107
3108 // call into the chained handler
3109 if (siginfo_flag_set) {
3110 (*sa)(sig, siginfo, context);
3111 } else {
3112 (*hand)(sig);
3113 }
3114
3115 // restore the signal mask
3116 pthread_sigmask(SIG_SETMASK, &oset, 0);
3117 }
3118 // Tell jvm's signal handler the signal is taken care of.
3119 return true;
3120 }
3121
3122 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3123 bool chained = false;
3124 // signal-chaining
3125 if (UseSignalChaining) {
3126 struct sigaction *actp = get_chained_signal_action(sig);
3127 if (actp != NULL) {
3128 chained = call_chained_handler(actp, sig, siginfo, context);
3129 }
3130 }
3131 return chained;
3132 }
3133
3134 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3135 if (sigismember(&sigs, sig)) {
3136 return &sigact[sig];
3137 }
3138 return NULL;
3139 }
3140
3141 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3142 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3143 sigact[sig] = oldAct;
3144 sigaddset(&sigs, sig);
3145 }
3146
3147 // for diagnostic
3148 int sigflags[NSIG];
3149
3150 int os::Aix::get_our_sigflags(int sig) {
3151 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3152 return sigflags[sig];
3153 }
3154
3155 void os::Aix::set_our_sigflags(int sig, int flags) {
3156 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3157 if (sig > 0 && sig < NSIG) {
3158 sigflags[sig] = flags;
3159 }
3160 }
3161
3162 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3163 // Check for overwrite.
3164 struct sigaction oldAct;
3165 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3166
3167 void* oldhand = oldAct.sa_sigaction
3168 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3169 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3170 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3171 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3172 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3173 if (AllowUserSignalHandlers || !set_installed) {
3174 // Do not overwrite; user takes responsibility to forward to us.
3175 return;
3176 } else if (UseSignalChaining) {
3177 // save the old handler in jvm
3178 save_preinstalled_handler(sig, oldAct);
3179 // libjsig also interposes the sigaction() call below and saves the
3180 // old sigaction on it own.
3181 } else {
3182 fatal("Encountered unexpected pre-existing sigaction handler "
3183 "%#lx for signal %d.", (long)oldhand, sig);
3184 }
3185 }
3186
3187 struct sigaction sigAct;
3188 sigfillset(&(sigAct.sa_mask));
3189 if (!set_installed) {
3190 sigAct.sa_handler = SIG_DFL;
3191 sigAct.sa_flags = SA_RESTART;
3192 } else {
3193 sigAct.sa_sigaction = javaSignalHandler;
3194 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3195 }
3196 // Save flags, which are set by ours
3197 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3198 sigflags[sig] = sigAct.sa_flags;
3199
3200 int ret = sigaction(sig, &sigAct, &oldAct);
3201 assert(ret == 0, "check");
3202
3203 void* oldhand2 = oldAct.sa_sigaction
3204 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3205 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3206 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3207 }
3208
3209 // install signal handlers for signals that HotSpot needs to
3210 // handle in order to support Java-level exception handling.
3211 void os::Aix::install_signal_handlers() {
3212 if (!signal_handlers_are_installed) {
3213 signal_handlers_are_installed = true;
3214
3215 // signal-chaining
3216 typedef void (*signal_setting_t)();
3217 signal_setting_t begin_signal_setting = NULL;
3218 signal_setting_t end_signal_setting = NULL;
3219 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3220 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3221 if (begin_signal_setting != NULL) {
3222 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3223 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3224 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3225 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3226 libjsig_is_loaded = true;
3227 assert(UseSignalChaining, "should enable signal-chaining");
3228 }
3229 if (libjsig_is_loaded) {
3230 // Tell libjsig jvm is setting signal handlers.
3231 (*begin_signal_setting)();
3232 }
3233
3234 ::sigemptyset(&sigs);
3235 set_signal_handler(SIGSEGV, true);
3236 set_signal_handler(SIGPIPE, true);
3237 set_signal_handler(SIGBUS, true);
3238 set_signal_handler(SIGILL, true);
3239 set_signal_handler(SIGFPE, true);
3240 set_signal_handler(SIGTRAP, true);
3241 set_signal_handler(SIGXFSZ, true);
3242
3243 if (libjsig_is_loaded) {
3244 // Tell libjsig jvm finishes setting signal handlers.
3245 (*end_signal_setting)();
3246 }
3247
3248 // We don't activate signal checker if libjsig is in place, we trust ourselves
3249 // and if UserSignalHandler is installed all bets are off.
3250 // Log that signal checking is off only if -verbose:jni is specified.
3251 if (CheckJNICalls) {
3252 if (libjsig_is_loaded) {
3253 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3254 check_signals = false;
3255 }
3256 if (AllowUserSignalHandlers) {
3257 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3258 check_signals = false;
3259 }
3260 // Need to initialize check_signal_done.
3261 ::sigemptyset(&check_signal_done);
3262 }
3263 }
3264 }
3265
3266 static const char* get_signal_handler_name(address handler,
3267 char* buf, int buflen) {
3268 int offset;
3269 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3270 if (found) {
3271 // skip directory names
3272 const char *p1, *p2;
3273 p1 = buf;
3274 size_t len = strlen(os::file_separator());
3275 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3276 // The way os::dll_address_to_library_name is implemented on Aix
3277 // right now, it always returns -1 for the offset which is not
3278 // terribly informative.
3279 // Will fix that. For now, omit the offset.
3280 jio_snprintf(buf, buflen, "%s", p1);
3281 } else {
3282 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3283 }
3284 return buf;
3285 }
3286
3287 static void print_signal_handler(outputStream* st, int sig,
3288 char* buf, size_t buflen) {
3289 struct sigaction sa;
3290 sigaction(sig, NULL, &sa);
3291
3292 st->print("%s: ", os::exception_name(sig, buf, buflen));
3293
3294 address handler = (sa.sa_flags & SA_SIGINFO)
3295 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3296 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3297
3298 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3299 st->print("SIG_DFL");
3300 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3301 st->print("SIG_IGN");
3302 } else {
3303 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3304 }
3305
3306 // Print readable mask.
3307 st->print(", sa_mask[0]=");
3308 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3309
3310 address rh = VMError::get_resetted_sighandler(sig);
3311 // May be, handler was resetted by VMError?
3312 if (rh != NULL) {
3313 handler = rh;
3314 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3315 }
3316
3317 // Print textual representation of sa_flags.
3318 st->print(", sa_flags=");
3319 os::Posix::print_sa_flags(st, sa.sa_flags);
3320
3321 // Check: is it our handler?
3322 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3323 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3324 // It is our signal handler.
3325 // Check for flags, reset system-used one!
3326 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3327 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3328 os::Aix::get_our_sigflags(sig));
3329 }
3330 }
3331 st->cr();
3332 }
3333
3334 #define DO_SIGNAL_CHECK(sig) \
3335 if (!sigismember(&check_signal_done, sig)) \
3336 os::Aix::check_signal_handler(sig)
3337
3338 // This method is a periodic task to check for misbehaving JNI applications
3339 // under CheckJNI, we can add any periodic checks here
3340
3341 void os::run_periodic_checks() {
3342
3343 if (check_signals == false) return;
3344
3345 // SEGV and BUS if overridden could potentially prevent
3346 // generation of hs*.log in the event of a crash, debugging
3347 // such a case can be very challenging, so we absolutely
3348 // check the following for a good measure:
3349 DO_SIGNAL_CHECK(SIGSEGV);
3350 DO_SIGNAL_CHECK(SIGILL);
3351 DO_SIGNAL_CHECK(SIGFPE);
3352 DO_SIGNAL_CHECK(SIGBUS);
3353 DO_SIGNAL_CHECK(SIGPIPE);
3354 DO_SIGNAL_CHECK(SIGXFSZ);
3355 if (UseSIGTRAP) {
3356 DO_SIGNAL_CHECK(SIGTRAP);
3357 }
3358
3359 // ReduceSignalUsage allows the user to override these handlers
3360 // see comments at the very top and jvm_md.h
3361 if (!ReduceSignalUsage) {
3362 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3363 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3364 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3365 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3366 }
3367
3368 DO_SIGNAL_CHECK(SR_signum);
3369 }
3370
3371 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3372
3373 static os_sigaction_t os_sigaction = NULL;
3374
3375 void os::Aix::check_signal_handler(int sig) {
3376 char buf[O_BUFLEN];
3377 address jvmHandler = NULL;
3378
3379 struct sigaction act;
3380 if (os_sigaction == NULL) {
3381 // only trust the default sigaction, in case it has been interposed
3382 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3383 if (os_sigaction == NULL) return;
3384 }
3385
3386 os_sigaction(sig, (struct sigaction*)NULL, &act);
3387
3388 address thisHandler = (act.sa_flags & SA_SIGINFO)
3389 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3390 : CAST_FROM_FN_PTR(address, act.sa_handler);
3391
3392 switch(sig) {
3393 case SIGSEGV:
3394 case SIGBUS:
3395 case SIGFPE:
3396 case SIGPIPE:
3397 case SIGILL:
3398 case SIGXFSZ:
3399 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3400 break;
3401
3402 case SHUTDOWN1_SIGNAL:
3403 case SHUTDOWN2_SIGNAL:
3404 case SHUTDOWN3_SIGNAL:
3405 case BREAK_SIGNAL:
3406 jvmHandler = (address)user_handler();
3407 break;
3408
3409 default:
3410 if (sig == SR_signum) {
3411 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3412 } else {
3413 return;
3414 }
3415 break;
3416 }
3417
3418 if (thisHandler != jvmHandler) {
3419 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3420 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3421 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3422 // No need to check this sig any longer
3423 sigaddset(&check_signal_done, sig);
3424 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3425 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3426 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3427 exception_name(sig, buf, O_BUFLEN));
3428 }
3429 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3430 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3431 tty->print("expected:");
3432 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3433 tty->cr();
3434 tty->print(" found:");
3435 os::Posix::print_sa_flags(tty, act.sa_flags);
3436 tty->cr();
3437 // No need to check this sig any longer
3438 sigaddset(&check_signal_done, sig);
3439 }
3440
3441 // Dump all the signal
3442 if (sigismember(&check_signal_done, sig)) {
3443 print_signal_handlers(tty, buf, O_BUFLEN);
3444 }
3445 }
3446
3447 // To install functions for atexit system call
3448 extern "C" {
3449 static void perfMemory_exit_helper() {
3450 perfMemory_exit();
3451 }
3452 }
3453
3454 // This is called _before_ the most of global arguments have been parsed.
3455 void os::init(void) {
3456 // This is basic, we want to know if that ever changes.
3457 // (Shared memory boundary is supposed to be a 256M aligned.)
3458 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3459
3460 // Record process break at startup.
3461 g_brk_at_startup = (address) ::sbrk(0);
3462 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3463
3464 // First off, we need to know whether we run on AIX or PASE, and
3465 // the OS level we run on.
3466 os::Aix::initialize_os_info();
3467
3468 // Scan environment (SPEC1170 behaviour, etc).
3469 os::Aix::scan_environment();
3470
3471 // Probe multipage support.
3472 query_multipage_support();
3473
3474 // Act like we only have one page size by eliminating corner cases which
3475 // we did not support very well anyway.
3476 // We have two input conditions:
3477 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3478 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3479 // setting.
3480 // Data segment page size is important for us because it defines the thread stack page
3481 // size, which is needed for guard page handling, stack banging etc.
3482 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3483 // and should be allocated with 64k pages.
3484 //
3485 // So, we do the following:
3486 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3487 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3488 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3489 // 64k no --- AIX 5.2 ? ---
3490 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3491
3492 // We explicitly leave no option to change page size, because only upgrading would work,
3493 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3494
3495 if (g_multipage_support.datapsize == 4*K) {
3496 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3497 if (g_multipage_support.can_use_64K_pages) {
3498 // .. but we are able to use 64K pages dynamically.
3499 // This would be typical for java launchers which are not linked
3500 // with datapsize=64K (like, any other launcher but our own).
3501 //
3502 // In this case it would be smart to allocate the java heap with 64K
3503 // to get the performance benefit, and to fake 64k pages for the
3504 // data segment (when dealing with thread stacks).
3505 //
3506 // However, leave a possibility to downgrade to 4K, using
3507 // -XX:-Use64KPages.
3508 if (Use64KPages) {
3509 trcVerbose("64K page mode (faked for data segment)");
3510 Aix::_page_size = 64*K;
3511 } else {
3512 trcVerbose("4K page mode (Use64KPages=off)");
3513 Aix::_page_size = 4*K;
3514 }
3515 } else {
3516 // .. and not able to allocate 64k pages dynamically. Here, just
3517 // fall back to 4K paged mode and use mmap for everything.
3518 trcVerbose("4K page mode");
3519 Aix::_page_size = 4*K;
3520 FLAG_SET_ERGO(bool, Use64KPages, false);
3521 }
3522 } else {
3523 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3524 // This normally means that we can allocate 64k pages dynamically.
3525 // (There is one special case where this may be false: EXTSHM=on.
3526 // but we decided to not support that mode).
3527 assert0(g_multipage_support.can_use_64K_pages);
3528 Aix::_page_size = 64*K;
3529 trcVerbose("64K page mode");
3530 FLAG_SET_ERGO(bool, Use64KPages, true);
3531 }
3532
3533 // For now UseLargePages is just ignored.
3534 FLAG_SET_ERGO(bool, UseLargePages, false);
3535 _page_sizes[0] = 0;
3536
3537 // debug trace
3538 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3539
3540 // Next, we need to initialize libo4 and libperfstat libraries.
3541 if (os::Aix::on_pase()) {
3542 os::Aix::initialize_libo4();
3543 } else {
3544 os::Aix::initialize_libperfstat();
3545 }
3546
3547 // Reset the perfstat information provided by ODM.
3548 if (os::Aix::on_aix()) {
3549 libperfstat::perfstat_reset();
3550 }
3551
3552 // Now initialze basic system properties. Note that for some of the values we
3553 // need libperfstat etc.
3554 os::Aix::initialize_system_info();
3555
3556 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3557
3558 init_random(1234567);
3559
3560 // _main_thread points to the thread that created/loaded the JVM.
3561 Aix::_main_thread = pthread_self();
3562
3563 initial_time_count = os::elapsed_counter();
3564
3565 os::Posix::init();
3566 }
3567
3568 // This is called _after_ the global arguments have been parsed.
3569 jint os::init_2(void) {
3570
3571 os::Posix::init_2();
3572
3573 if (os::Aix::on_pase()) {
3574 trcVerbose("Running on PASE.");
3575 } else {
3576 trcVerbose("Running on AIX (not PASE).");
3577 }
3578
3579 trcVerbose("processor count: %d", os::_processor_count);
3580 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3581
3582 // Initially build up the loaded dll map.
3583 LoadedLibraries::reload();
3584 if (Verbose) {
3585 trcVerbose("Loaded Libraries: ");
3586 LoadedLibraries::print(tty);
3587 }
3588
3589 // initialize suspend/resume support - must do this before signal_sets_init()
3590 if (SR_initialize() != 0) {
3591 perror("SR_initialize failed");
3592 return JNI_ERR;
3593 }
3594
3595 Aix::signal_sets_init();
3596 Aix::install_signal_handlers();
3597 // Initialize data for jdk.internal.misc.Signal
3598 if (!ReduceSignalUsage) {
3599 signal_init_pd();
3600 }
3601
3602 // Check and sets minimum stack sizes against command line options
3603 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3604 return JNI_ERR;
3605 }
3606
3607 if (UseNUMA) {
3608 UseNUMA = false;
3609 warning("NUMA optimizations are not available on this OS.");
3610 }
3611
3612 if (MaxFDLimit) {
3613 // Set the number of file descriptors to max. print out error
3614 // if getrlimit/setrlimit fails but continue regardless.
3615 struct rlimit nbr_files;
3616 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3617 if (status != 0) {
3618 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3619 } else {
3620 nbr_files.rlim_cur = nbr_files.rlim_max;
3621 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3622 if (status != 0) {
3623 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3624 }
3625 }
3626 }
3627
3628 if (PerfAllowAtExitRegistration) {
3629 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3630 // At exit functions can be delayed until process exit time, which
3631 // can be problematic for embedded VM situations. Embedded VMs should
3632 // call DestroyJavaVM() to assure that VM resources are released.
3633
3634 // Note: perfMemory_exit_helper atexit function may be removed in
3635 // the future if the appropriate cleanup code can be added to the
3636 // VM_Exit VMOperation's doit method.
3637 if (atexit(perfMemory_exit_helper) != 0) {
3638 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3639 }
3640 }
3641
3642 return JNI_OK;
3643 }
3644
3645 // Mark the polling page as unreadable
3646 void os::make_polling_page_unreadable(void) {
3647 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3648 fatal("Could not disable polling page");
3649 }
3650 };
3651
3652 // Mark the polling page as readable
3653 void os::make_polling_page_readable(void) {
3654 // Changed according to os_linux.cpp.
3655 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3656 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3657 }
3658 };
3659
3660 int os::active_processor_count() {
3661 // User has overridden the number of active processors
3662 if (ActiveProcessorCount > 0) {
3663 log_trace(os)("active_processor_count: "
3664 "active processor count set by user : %d",
3665 ActiveProcessorCount);
3666 return ActiveProcessorCount;
3667 }
3668
3669 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3670 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3671 return online_cpus;
3672 }
3673
3674 void os::set_native_thread_name(const char *name) {
3675 // Not yet implemented.
3676 return;
3677 }
3678
3679 bool os::distribute_processes(uint length, uint* distribution) {
3680 // Not yet implemented.
3681 return false;
3682 }
3683
3684 bool os::bind_to_processor(uint processor_id) {
3685 // Not yet implemented.
3686 return false;
3687 }
3688
3689 void os::SuspendedThreadTask::internal_do_task() {
3690 if (do_suspend(_thread->osthread())) {
3691 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3692 do_task(context);
3693 do_resume(_thread->osthread());
3694 }
3695 }
3696
3697 ////////////////////////////////////////////////////////////////////////////////
3698 // debug support
3699
3700 bool os::find(address addr, outputStream* st) {
3701
3702 st->print(PTR_FORMAT ": ", addr);
3703
3704 loaded_module_t lm;
3705 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3706 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3707 st->print_cr("%s", lm.path);
3708 return true;
3709 }
3710
3711 return false;
3712 }
3713
3714 ////////////////////////////////////////////////////////////////////////////////
3715 // misc
3716
3717 // This does not do anything on Aix. This is basically a hook for being
3718 // able to use structured exception handling (thread-local exception filters)
3719 // on, e.g., Win32.
3720 void
3721 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3722 JavaCallArguments* args, Thread* thread) {
3723 f(value, method, args, thread);
3724 }
3725
3726 void os::print_statistics() {
3727 }
3728
3729 bool os::message_box(const char* title, const char* message) {
3730 int i;
3731 fdStream err(defaultStream::error_fd());
3732 for (i = 0; i < 78; i++) err.print_raw("=");
3733 err.cr();
3734 err.print_raw_cr(title);
3735 for (i = 0; i < 78; i++) err.print_raw("-");
3736 err.cr();
3737 err.print_raw_cr(message);
3738 for (i = 0; i < 78; i++) err.print_raw("=");
3739 err.cr();
3740
3741 char buf[16];
3742 // Prevent process from exiting upon "read error" without consuming all CPU
3743 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3744
3745 return buf[0] == 'y' || buf[0] == 'Y';
3746 }
3747
3748 int os::stat(const char *path, struct stat *sbuf) {
3749 char pathbuf[MAX_PATH];
3750 if (strlen(path) > MAX_PATH - 1) {
3751 errno = ENAMETOOLONG;
3752 return -1;
3753 }
3754 os::native_path(strcpy(pathbuf, path));
3755 return ::stat(pathbuf, sbuf);
3756 }
3757
3758 // Is a (classpath) directory empty?
3759 bool os::dir_is_empty(const char* path) {
3760 DIR *dir = NULL;
3761 struct dirent *ptr;
3762
3763 dir = opendir(path);
3764 if (dir == NULL) return true;
3765
3766 /* Scan the directory */
3767 bool result = true;
3768 char buf[sizeof(struct dirent) + MAX_PATH];
3769 while (result && (ptr = ::readdir(dir)) != NULL) {
3770 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3771 result = false;
3772 }
3773 }
3774 closedir(dir);
3775 return result;
3776 }
3777
3778 // This code originates from JDK's sysOpen and open64_w
3779 // from src/solaris/hpi/src/system_md.c
3780
3781 int os::open(const char *path, int oflag, int mode) {
3782
3783 if (strlen(path) > MAX_PATH - 1) {
3784 errno = ENAMETOOLONG;
3785 return -1;
3786 }
3787 int fd;
3788
3789 fd = ::open64(path, oflag, mode);
3790 if (fd == -1) return -1;
3791
3792 // If the open succeeded, the file might still be a directory.
3793 {
3794 struct stat64 buf64;
3795 int ret = ::fstat64(fd, &buf64);
3796 int st_mode = buf64.st_mode;
3797
3798 if (ret != -1) {
3799 if ((st_mode & S_IFMT) == S_IFDIR) {
3800 errno = EISDIR;
3801 ::close(fd);
3802 return -1;
3803 }
3804 } else {
3805 ::close(fd);
3806 return -1;
3807 }
3808 }
3809
3810 // All file descriptors that are opened in the JVM and not
3811 // specifically destined for a subprocess should have the
3812 // close-on-exec flag set. If we don't set it, then careless 3rd
3813 // party native code might fork and exec without closing all
3814 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3815 // UNIXProcess.c), and this in turn might:
3816 //
3817 // - cause end-of-file to fail to be detected on some file
3818 // descriptors, resulting in mysterious hangs, or
3819 //
3820 // - might cause an fopen in the subprocess to fail on a system
3821 // suffering from bug 1085341.
3822 //
3823 // (Yes, the default setting of the close-on-exec flag is a Unix
3824 // design flaw.)
3825 //
3826 // See:
3827 // 1085341: 32-bit stdio routines should support file descriptors >255
3828 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3829 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3830 #ifdef FD_CLOEXEC
3831 {
3832 int flags = ::fcntl(fd, F_GETFD);
3833 if (flags != -1)
3834 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3835 }
3836 #endif
3837
3838 return fd;
3839 }
3840
3841 // create binary file, rewriting existing file if required
3842 int os::create_binary_file(const char* path, bool rewrite_existing) {
3843 int oflags = O_WRONLY | O_CREAT;
3844 if (!rewrite_existing) {
3845 oflags |= O_EXCL;
3846 }
3847 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3848 }
3849
3850 // return current position of file pointer
3851 jlong os::current_file_offset(int fd) {
3852 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3853 }
3854
3855 // move file pointer to the specified offset
3856 jlong os::seek_to_file_offset(int fd, jlong offset) {
3857 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3858 }
3859
3860 // This code originates from JDK's sysAvailable
3861 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3862
3863 int os::available(int fd, jlong *bytes) {
3864 jlong cur, end;
3865 int mode;
3866 struct stat64 buf64;
3867
3868 if (::fstat64(fd, &buf64) >= 0) {
3869 mode = buf64.st_mode;
3870 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3871 int n;
3872 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3873 *bytes = n;
3874 return 1;
3875 }
3876 }
3877 }
3878 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3879 return 0;
3880 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3881 return 0;
3882 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3883 return 0;
3884 }
3885 *bytes = end - cur;
3886 return 1;
3887 }
3888
3889 // Map a block of memory.
3890 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3891 char *addr, size_t bytes, bool read_only,
3892 bool allow_exec) {
3893 int prot;
3894 int flags = MAP_PRIVATE;
3895
3896 if (read_only) {
3897 prot = PROT_READ;
3898 flags = MAP_SHARED;
3899 } else {
3900 prot = PROT_READ | PROT_WRITE;
3901 flags = MAP_PRIVATE;
3902 }
3903
3904 if (allow_exec) {
3905 prot |= PROT_EXEC;
3906 }
3907
3908 if (addr != NULL) {
3909 flags |= MAP_FIXED;
3910 }
3911
3912 // Allow anonymous mappings if 'fd' is -1.
3913 if (fd == -1) {
3914 flags |= MAP_ANONYMOUS;
3915 }
3916
3917 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3918 fd, file_offset);
3919 if (mapped_address == MAP_FAILED) {
3920 return NULL;
3921 }
3922 return mapped_address;
3923 }
3924
3925 // Remap a block of memory.
3926 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3927 char *addr, size_t bytes, bool read_only,
3928 bool allow_exec) {
3929 // same as map_memory() on this OS
3930 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3931 allow_exec);
3932 }
3933
3934 // Unmap a block of memory.
3935 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3936 return munmap(addr, bytes) == 0;
3937 }
3938
3939 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3940 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3941 // of a thread.
3942 //
3943 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3944 // the fast estimate available on the platform.
3945
3946 jlong os::current_thread_cpu_time() {
3947 // return user + sys since the cost is the same
3948 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3949 assert(n >= 0, "negative CPU time");
3950 return n;
3951 }
3952
3953 jlong os::thread_cpu_time(Thread* thread) {
3954 // consistent with what current_thread_cpu_time() returns
3955 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3956 assert(n >= 0, "negative CPU time");
3957 return n;
3958 }
3959
3960 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3961 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3962 assert(n >= 0, "negative CPU time");
3963 return n;
3964 }
3965
3966 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3967 bool error = false;
3968
3969 jlong sys_time = 0;
3970 jlong user_time = 0;
3971
3972 // Reimplemented using getthrds64().
3973 //
3974 // Works like this:
3975 // For the thread in question, get the kernel thread id. Then get the
3976 // kernel thread statistics using that id.
3977 //
3978 // This only works of course when no pthread scheduling is used,
3979 // i.e. there is a 1:1 relationship to kernel threads.
3980 // On AIX, see AIXTHREAD_SCOPE variable.
3981
3982 pthread_t pthtid = thread->osthread()->pthread_id();
3983
3984 // retrieve kernel thread id for the pthread:
3985 tid64_t tid = 0;
3986 struct __pthrdsinfo pinfo;
3987 // I just love those otherworldly IBM APIs which force me to hand down
3988 // dummy buffers for stuff I dont care for...
3989 char dummy[1];
3990 int dummy_size = sizeof(dummy);
3991 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3992 dummy, &dummy_size) == 0) {
3993 tid = pinfo.__pi_tid;
3994 } else {
3995 tty->print_cr("pthread_getthrds_np failed.");
3996 error = true;
3997 }
3998
3999 // retrieve kernel timing info for that kernel thread
4000 if (!error) {
4001 struct thrdentry64 thrdentry;
4002 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4003 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4004 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4005 } else {
4006 tty->print_cr("pthread_getthrds_np failed.");
4007 error = true;
4008 }
4009 }
4010
4011 if (p_sys_time) {
4012 *p_sys_time = sys_time;
4013 }
4014
4015 if (p_user_time) {
4016 *p_user_time = user_time;
4017 }
4018
4019 if (error) {
4020 return false;
4021 }
4022
4023 return true;
4024 }
4025
4026 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4027 jlong sys_time;
4028 jlong user_time;
4029
4030 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4031 return -1;
4032 }
4033
4034 return user_sys_cpu_time ? sys_time + user_time : user_time;
4035 }
4036
4037 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4038 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4039 info_ptr->may_skip_backward = false; // elapsed time not wall time
4040 info_ptr->may_skip_forward = false; // elapsed time not wall time
4041 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4042 }
4043
4044 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4045 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4046 info_ptr->may_skip_backward = false; // elapsed time not wall time
4047 info_ptr->may_skip_forward = false; // elapsed time not wall time
4048 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4049 }
4050
4051 bool os::is_thread_cpu_time_supported() {
4052 return true;
4053 }
4054
4055 // System loadavg support. Returns -1 if load average cannot be obtained.
4056 // For now just return the system wide load average (no processor sets).
4057 int os::loadavg(double values[], int nelem) {
4058
4059 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4060 guarantee(values, "argument error");
4061
4062 if (os::Aix::on_pase()) {
4063
4064 // AS/400 PASE: use libo4 porting library
4065 double v[3] = { 0.0, 0.0, 0.0 };
4066
4067 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4068 for (int i = 0; i < nelem; i ++) {
4069 values[i] = v[i];
4070 }
4071 return nelem;
4072 } else {
4073 return -1;
4074 }
4075
4076 } else {
4077
4078 // AIX: use libperfstat
4079 libperfstat::cpuinfo_t ci;
4080 if (libperfstat::get_cpuinfo(&ci)) {
4081 for (int i = 0; i < nelem; i++) {
4082 values[i] = ci.loadavg[i];
4083 }
4084 } else {
4085 return -1;
4086 }
4087 return nelem;
4088 }
4089 }
4090
4091 void os::pause() {
4092 char filename[MAX_PATH];
4093 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4094 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4095 } else {
4096 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4097 }
4098
4099 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4100 if (fd != -1) {
4101 struct stat buf;
4102 ::close(fd);
4103 while (::stat(filename, &buf) == 0) {
4104 (void)::poll(NULL, 0, 100);
4105 }
4106 } else {
4107 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4108 }
4109 }
4110
4111 bool os::is_primordial_thread(void) {
4112 if (pthread_self() == (pthread_t)1) {
4113 return true;
4114 } else {
4115 return false;
4116 }
4117 }
4118
4119 // OS recognitions (PASE/AIX, OS level) call this before calling any
4120 // one of Aix::on_pase(), Aix::os_version() static
4121 void os::Aix::initialize_os_info() {
4122
4123 assert(_on_pase == -1 && _os_version == 0, "already called.");
4124
4125 struct utsname uts;
4126 memset(&uts, 0, sizeof(uts));
4127 strcpy(uts.sysname, "?");
4128 if (::uname(&uts) == -1) {
4129 trcVerbose("uname failed (%d)", errno);
4130 guarantee(0, "Could not determine whether we run on AIX or PASE");
4131 } else {
4132 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4133 "node \"%s\" machine \"%s\"\n",
4134 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4135 const int major = atoi(uts.version);
4136 assert(major > 0, "invalid OS version");
4137 const int minor = atoi(uts.release);
4138 assert(minor > 0, "invalid OS release");
4139 _os_version = (major << 24) | (minor << 16);
4140 char ver_str[20] = {0};
4141 char *name_str = "unknown OS";
4142 if (strcmp(uts.sysname, "OS400") == 0) {
4143 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4144 _on_pase = 1;
4145 if (os_version_short() < 0x0504) {
4146 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4147 assert(false, "OS/400 release too old.");
4148 }
4149 name_str = "OS/400 (pase)";
4150 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4151 } else if (strcmp(uts.sysname, "AIX") == 0) {
4152 // We run on AIX. We do not support versions older than AIX 5.3.
4153 _on_pase = 0;
4154 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4155 odmWrapper::determine_os_kernel_version(&_os_version);
4156 if (os_version_short() < 0x0503) {
4157 trcVerbose("AIX release older than AIX 5.3 not supported.");
4158 assert(false, "AIX release too old.");
4159 }
4160 name_str = "AIX";
4161 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4162 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4163 } else {
4164 assert(false, name_str);
4165 }
4166 trcVerbose("We run on %s %s", name_str, ver_str);
4167 }
4168
4169 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4170 } // end: os::Aix::initialize_os_info()
4171
4172 // Scan environment for important settings which might effect the VM.
4173 // Trace out settings. Warn about invalid settings and/or correct them.
4174 //
4175 // Must run after os::Aix::initialue_os_info().
4176 void os::Aix::scan_environment() {
4177
4178 char* p;
4179 int rc;
4180
4181 // Warn explicity if EXTSHM=ON is used. That switch changes how
4182 // System V shared memory behaves. One effect is that page size of
4183 // shared memory cannot be change dynamically, effectivly preventing
4184 // large pages from working.
4185 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4186 // recommendation is (in OSS notes) to switch it off.
4187 p = ::getenv("EXTSHM");
4188 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4189 if (p && strcasecmp(p, "ON") == 0) {
4190 _extshm = 1;
4191 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4192 if (!AllowExtshm) {
4193 // We allow under certain conditions the user to continue. However, we want this
4194 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4195 // that the VM is not able to allocate 64k pages for the heap.
4196 // We do not want to run with reduced performance.
4197 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4198 }
4199 } else {
4200 _extshm = 0;
4201 }
4202
4203 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4204 // Not tested, not supported.
4205 //
4206 // Note that it might be worth the trouble to test and to require it, if only to
4207 // get useful return codes for mprotect.
4208 //
4209 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4210 // exec() ? before loading the libjvm ? ....)
4211 p = ::getenv("XPG_SUS_ENV");
4212 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4213 if (p && strcmp(p, "ON") == 0) {
4214 _xpg_sus_mode = 1;
4215 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4216 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4217 // clobber address ranges. If we ever want to support that, we have to do some
4218 // testing first.
4219 guarantee(false, "XPG_SUS_ENV=ON not supported");
4220 } else {
4221 _xpg_sus_mode = 0;
4222 }
4223
4224 if (os::Aix::on_pase()) {
4225 p = ::getenv("QIBM_MULTI_THREADED");
4226 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4227 }
4228
4229 p = ::getenv("LDR_CNTRL");
4230 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4231 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4232 if (p && ::strstr(p, "TEXTPSIZE")) {
4233 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4234 "you may experience hangs or crashes on OS/400 V7R1.");
4235 }
4236 }
4237
4238 p = ::getenv("AIXTHREAD_GUARDPAGES");
4239 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4240
4241 } // end: os::Aix::scan_environment()
4242
4243 // PASE: initialize the libo4 library (PASE porting library).
4244 void os::Aix::initialize_libo4() {
4245 guarantee(os::Aix::on_pase(), "OS/400 only.");
4246 if (!libo4::init()) {
4247 trcVerbose("libo4 initialization failed.");
4248 assert(false, "libo4 initialization failed");
4249 } else {
4250 trcVerbose("libo4 initialized.");
4251 }
4252 }
4253
4254 // AIX: initialize the libperfstat library.
4255 void os::Aix::initialize_libperfstat() {
4256 assert(os::Aix::on_aix(), "AIX only");
4257 if (!libperfstat::init()) {
4258 trcVerbose("libperfstat initialization failed.");
4259 assert(false, "libperfstat initialization failed");
4260 } else {
4261 trcVerbose("libperfstat initialized.");
4262 }
4263 }
4264
4265 /////////////////////////////////////////////////////////////////////////////
4266 // thread stack
4267
4268 // Get the current stack base from the OS (actually, the pthread library).
4269 // Note: usually not page aligned.
4270 address os::current_stack_base() {
4271 AixMisc::stackbounds_t bounds;
4272 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4273 guarantee(rc, "Unable to retrieve stack bounds.");
4274 return bounds.base;
4275 }
4276
4277 // Get the current stack size from the OS (actually, the pthread library).
4278 // Returned size is such that (base - size) is always aligned to page size.
4279 size_t os::current_stack_size() {
4280 AixMisc::stackbounds_t bounds;
4281 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4282 guarantee(rc, "Unable to retrieve stack bounds.");
4283 // Align the returned stack size such that the stack low address
4284 // is aligned to page size (Note: base is usually not and we do not care).
4285 // We need to do this because caller code will assume stack low address is
4286 // page aligned and will place guard pages without checking.
4287 address low = bounds.base - bounds.size;
4288 address low_aligned = (address)align_up(low, os::vm_page_size());
4289 size_t s = bounds.base - low_aligned;
4290 return s;
4291 }
4292
4293 extern char** environ;
4294
4295 // Run the specified command in a separate process. Return its exit value,
4296 // or -1 on failure (e.g. can't fork a new process).
4297 // Unlike system(), this function can be called from signal handler. It
4298 // doesn't block SIGINT et al.
4299 int os::fork_and_exec(char* cmd) {
4300 char * argv[4] = {"sh", "-c", cmd, NULL};
4301
4302 pid_t pid = fork();
4303
4304 if (pid < 0) {
4305 // fork failed
4306 return -1;
4307
4308 } else if (pid == 0) {
4309 // child process
4310
4311 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4312 execve("/usr/bin/sh", argv, environ);
4313
4314 // execve failed
4315 _exit(-1);
4316
4317 } else {
4318 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4319 // care about the actual exit code, for now.
4320
4321 int status;
4322
4323 // Wait for the child process to exit. This returns immediately if
4324 // the child has already exited. */
4325 while (waitpid(pid, &status, 0) < 0) {
4326 switch (errno) {
4327 case ECHILD: return 0;
4328 case EINTR: break;
4329 default: return -1;
4330 }
4331 }
4332
4333 if (WIFEXITED(status)) {
4334 // The child exited normally; get its exit code.
4335 return WEXITSTATUS(status);
4336 } else if (WIFSIGNALED(status)) {
4337 // The child exited because of a signal.
4338 // The best value to return is 0x80 + signal number,
4339 // because that is what all Unix shells do, and because
4340 // it allows callers to distinguish between process exit and
4341 // process death by signal.
4342 return 0x80 + WTERMSIG(status);
4343 } else {
4344 // Unknown exit code; pass it through.
4345 return status;
4346 }
4347 }
4348 return -1;
4349 }
4350
4351 // Get the default path to the core file
4352 // Returns the length of the string
4353 int os::get_core_path(char* buffer, size_t bufferSize) {
4354 const char* p = get_current_directory(buffer, bufferSize);
4355
4356 if (p == NULL) {
4357 assert(p != NULL, "failed to get current directory");
4358 return 0;
4359 }
4360
4361 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4362 p, current_process_id());
4363
4364 return strlen(buffer);
4365 }
4366
4367 #ifndef PRODUCT
4368 void TestReserveMemorySpecial_test() {
4369 // No tests available for this platform
4370 }
4371 #endif
4372
4373 bool os::start_debugging(char *buf, int buflen) {
4374 int len = (int)strlen(buf);
4375 char *p = &buf[len];
4376
4377 jio_snprintf(p, buflen -len,
4378 "\n\n"
4379 "Do you want to debug the problem?\n\n"
4380 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4381 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4382 "Otherwise, press RETURN to abort...",
4383 os::current_process_id(),
4384 os::current_thread_id(), thread_self());
4385
4386 bool yes = os::message_box("Unexpected Error", buf);
4387
4388 if (yes) {
4389 // yes, user asked VM to launch debugger
4390 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4391
4392 os::fork_and_exec(buf);
4393 yes = false;
4394 }
4395 return yes;
4396 }
4397
4398 static inline time_t get_mtime(const char* filename) {
4399 struct stat st;
4400 int ret = os::stat(filename, &st);
4401 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4402 return st.st_mtime;
4403 }
4404
4405 int os::compare_file_modified_times(const char* file1, const char* file2) {
4406 time_t t1 = get_mtime(file1);
4407 time_t t2 = get_mtime(file2);
4408 return t1 - t2;
4409 }