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