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