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