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.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/mutexLocker.hpp"
61 #include "runtime/objectMonitor.hpp"
62 #include "runtime/orderAccess.inline.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/osThread.hpp"
65 #include "runtime/perfMemory.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/statSampler.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/thread.inline.hpp"
70 #include "runtime/threadCritical.hpp"
71 #include "runtime/timer.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/runtimeService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/decoder.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/growableArray.hpp"
80 #include "utilities/vmError.hpp"
81
82 // put OS-includes here (sorted alphabetically)
83 #include <errno.h>
84 #include <fcntl.h>
85 #include <inttypes.h>
86 #include <poll.h>
87 #include <procinfo.h>
88 #include <pthread.h>
89 #include <pwd.h>
90 #include <semaphore.h>
91 #include <signal.h>
92 #include <stdint.h>
93 #include <stdio.h>
94 #include <string.h>
95 #include <unistd.h>
96 #include <sys/ioctl.h>
97 #include <sys/ipc.h>
98 #include <sys/mman.h>
99 #include <sys/resource.h>
100 #include <sys/select.h>
101 #include <sys/shm.h>
102 #include <sys/socket.h>
103 #include <sys/stat.h>
104 #include <sys/sysinfo.h>
105 #include <sys/systemcfg.h>
106 #include <sys/time.h>
107 #include <sys/times.h>
108 #include <sys/types.h>
109 #include <sys/utsname.h>
110 #include <sys/vminfo.h>
111 #include <sys/wait.h>
112
113 // Missing prototypes for various system APIs.
114 extern "C"
115 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
116
117 #if !defined(_AIXVERSION_610)
118 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
119 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
120 extern "C" int getargs(procsinfo*, int, char*, int);
121 #endif
122
123 #define MAX_PATH (2 * K)
124
125 // for timer info max values which include all bits
126 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
127 // for multipage initialization error analysis (in 'g_multipage_error')
128 #define ERROR_MP_OS_TOO_OLD 100
129 #define ERROR_MP_EXTSHM_ACTIVE 101
130 #define ERROR_MP_VMGETINFO_FAILED 102
131 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
132
133 // excerpts from systemcfg.h that might be missing on older os levels
134 #ifndef PV_5_Compat
135 #define PV_5_Compat 0x0F8000 /* Power PC 5 */
136 #endif
137 #ifndef PV_6
138 #define PV_6 0x100000 /* Power PC 6 */
139 #endif
140 #ifndef PV_6_1
141 #define PV_6_1 0x100001 /* Power PC 6 DD1.x */
142 #endif
143 #ifndef PV_6_Compat
144 #define PV_6_Compat 0x108000 /* Power PC 6 */
145 #endif
146 #ifndef PV_7
147 #define PV_7 0x200000 /* Power PC 7 */
148 #endif
149 #ifndef PV_7_Compat
150 #define PV_7_Compat 0x208000 /* Power PC 7 */
151 #endif
152 #ifndef PV_8
153 #define PV_8 0x300000 /* Power PC 8 */
154 #endif
155 #ifndef PV_8_Compat
156 #define PV_8_Compat 0x308000 /* Power PC 8 */
157 #endif
158
159 static address resolve_function_descriptor_to_code_pointer(address p);
160
161 static void vmembk_print_on(outputStream* os);
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // global variables (for a description see os_aix.hpp)
165
166 julong os::Aix::_physical_memory = 0;
167
168 pthread_t os::Aix::_main_thread = ((pthread_t)0);
169 int os::Aix::_page_size = -1;
170
171 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
172 int os::Aix::_on_pase = -1;
173
174 // 0 = uninitialized, otherwise 32 bit number:
175 // 0xVVRRTTSS
176 // VV - major version
177 // RR - minor version
178 // TT - tech level, if known, 0 otherwise
179 // SS - service pack, if known, 0 otherwise
180 uint32_t os::Aix::_os_version = 0;
181
182 // -1 = uninitialized, 0 - no, 1 - yes
183 int os::Aix::_xpg_sus_mode = -1;
184
185 // -1 = uninitialized, 0 - no, 1 - yes
186 int os::Aix::_extshm = -1;
187
188 ////////////////////////////////////////////////////////////////////////////////
189 // local variables
190
191 static jlong initial_time_count = 0;
192 static int clock_tics_per_sec = 100;
193 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
194 static bool check_signals = true;
195 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
196 static sigset_t SR_sigset;
197
198 // Process break recorded at startup.
199 static address g_brk_at_startup = NULL;
200
201 // This describes the state of multipage support of the underlying
202 // OS. Note that this is of no interest to the outsize world and
203 // therefore should not be defined in AIX class.
204 //
205 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
206 // latter two (16M "large" resp. 16G "huge" pages) require special
207 // setup and are normally not available.
208 //
209 // AIX supports multiple page sizes per process, for:
210 // - Stack (of the primordial thread, so not relevant for us)
211 // - Data - data, bss, heap, for us also pthread stacks
212 // - Text - text code
213 // - shared memory
214 //
215 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
216 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
217 //
218 // For shared memory, page size can be set dynamically via
219 // shmctl(). Different shared memory regions can have different page
220 // sizes.
221 //
222 // More information can be found at AIBM info center:
223 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
224 //
225 static struct {
226 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
227 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
228 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
229 size_t pthr_stack_pagesize; // stack page size of pthread threads
230 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
231 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
232 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
233 int error; // Error describing if something went wrong at multipage init.
234 } g_multipage_support = {
235 (size_t) -1,
236 (size_t) -1,
237 (size_t) -1,
238 (size_t) -1,
239 (size_t) -1,
240 false, false,
241 0
242 };
243
244 // We must not accidentally allocate memory close to the BRK - even if
245 // that would work - because then we prevent the BRK segment from
246 // growing which may result in a malloc OOM even though there is
247 // enough memory. The problem only arises if we shmat() or mmap() at
248 // a specific wish address, e.g. to place the heap in a
249 // compressed-oops-friendly way.
250 static bool is_close_to_brk(address a) {
251 assert0(g_brk_at_startup != NULL);
252 if (a >= g_brk_at_startup &&
253 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
254 return true;
255 }
256 return false;
257 }
258
259 julong os::available_memory() {
260 return Aix::available_memory();
261 }
262
263 julong os::Aix::available_memory() {
264 // Avoid expensive API call here, as returned value will always be null.
265 if (os::Aix::on_pase()) {
266 return 0x0LL;
267 }
268 os::Aix::meminfo_t mi;
269 if (os::Aix::get_meminfo(&mi)) {
270 return mi.real_free;
271 } else {
272 return ULONG_MAX;
273 }
274 }
275
276 julong os::physical_memory() {
277 return Aix::physical_memory();
278 }
279
280 // Return true if user is running as root.
281
282 bool os::have_special_privileges() {
283 static bool init = false;
284 static bool privileges = false;
285 if (!init) {
286 privileges = (getuid() != geteuid()) || (getgid() != getegid());
287 init = true;
288 }
289 return privileges;
290 }
291
292 // Helper function, emulates disclaim64 using multiple 32bit disclaims
293 // because we cannot use disclaim64() on AS/400 and old AIX releases.
294 static bool my_disclaim64(char* addr, size_t size) {
295
296 if (size == 0) {
297 return true;
298 }
299
300 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
301 const unsigned int maxDisclaimSize = 0x40000000;
302
303 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
304 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
305
306 char* p = addr;
307
308 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
309 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
310 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
311 return false;
312 }
313 p += maxDisclaimSize;
314 }
315
316 if (lastDisclaimSize > 0) {
317 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
318 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
319 return false;
320 }
321 }
322
323 return true;
324 }
325
326 // Cpu architecture string
327 #if defined(PPC32)
328 static char cpu_arch[] = "ppc";
329 #elif defined(PPC64)
330 static char cpu_arch[] = "ppc64";
331 #else
332 #error Add appropriate cpu_arch setting
333 #endif
334
335 // Wrap the function "vmgetinfo" which is not available on older OS releases.
336 static int checked_vmgetinfo(void *out, int command, int arg) {
337 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
338 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
339 }
340 return ::vmgetinfo(out, command, arg);
341 }
342
343 // Given an address, returns the size of the page backing that address.
344 size_t os::Aix::query_pagesize(void* addr) {
345
346 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
347 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
348 return 4*K;
349 }
350
351 vm_page_info pi;
352 pi.addr = (uint64_t)addr;
353 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
354 return pi.pagesize;
355 } else {
356 assert(false, "vmgetinfo failed to retrieve page size");
357 return 4*K;
358 }
359 }
360
361 void os::Aix::initialize_system_info() {
362
363 // Get the number of online(logical) cpus instead of configured.
364 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
365 assert(_processor_count > 0, "_processor_count must be > 0");
366
367 // Retrieve total physical storage.
368 os::Aix::meminfo_t mi;
369 if (!os::Aix::get_meminfo(&mi)) {
370 assert(false, "os::Aix::get_meminfo failed.");
371 }
372 _physical_memory = (julong) mi.real_total;
373 }
374
375 // Helper function for tracing page sizes.
376 static const char* describe_pagesize(size_t pagesize) {
377 switch (pagesize) {
378 case 4*K : return "4K";
379 case 64*K: return "64K";
380 case 16*M: return "16M";
381 case 16*G: return "16G";
382 default:
383 assert(false, "surprise");
384 return "??";
385 }
386 }
387
388 // Probe OS for multipage support.
389 // Will fill the global g_multipage_support structure.
390 // Must be called before calling os::large_page_init().
391 static void query_multipage_support() {
392
393 guarantee(g_multipage_support.pagesize == -1,
394 "do not call twice");
395
396 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
397
398 // This really would surprise me.
399 assert(g_multipage_support.pagesize == 4*K, "surprise!");
400
401 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
402 // Default data page size is defined either by linker options (-bdatapsize)
403 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
404 // default should be 4K.
405 {
406 void* p = ::malloc(16*M);
407 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
408 ::free(p);
409 }
410
411 // Query default shm page size (LDR_CNTRL SHMPSIZE).
412 // Note that this is pure curiosity. We do not rely on default page size but set
413 // our own page size after allocated.
414 {
415 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
416 guarantee(shmid != -1, "shmget failed");
417 void* p = ::shmat(shmid, NULL, 0);
418 ::shmctl(shmid, IPC_RMID, NULL);
419 guarantee(p != (void*) -1, "shmat failed");
420 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
421 ::shmdt(p);
422 }
423
424 // Before querying the stack page size, make sure we are not running as primordial
425 // thread (because primordial thread's stack may have different page size than
426 // pthread thread stacks). Running a VM on the primordial thread won't work for a
427 // number of reasons so we may just as well guarantee it here.
428 guarantee0(!os::is_primordial_thread());
429
430 // Query pthread stack page size. Should be the same as data page size because
431 // pthread stacks are allocated from C-Heap.
432 {
433 int dummy = 0;
434 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
435 }
436
437 // Query default text page size (LDR_CNTRL TEXTPSIZE).
438 {
439 address any_function =
440 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
441 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
442 }
443
444 // Now probe for support of 64K pages and 16M pages.
445
446 // Before OS/400 V6R1, there is no support for pages other than 4K.
447 if (os::Aix::on_pase_V5R4_or_older()) {
448 trcVerbose("OS/400 < V6R1 - no large page support.");
449 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
450 goto query_multipage_support_end;
451 }
452
453 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
454 {
455 const int MAX_PAGE_SIZES = 4;
456 psize_t sizes[MAX_PAGE_SIZES];
457 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
458 if (num_psizes == -1) {
459 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
460 trcVerbose("disabling multipage support.");
461 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
462 goto query_multipage_support_end;
463 }
464 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
465 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
466 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
467 for (int i = 0; i < num_psizes; i ++) {
468 trcVerbose(" %s ", describe_pagesize(sizes[i]));
469 }
470
471 // Can we use 64K, 16M pages?
472 for (int i = 0; i < num_psizes; i ++) {
473 const size_t pagesize = sizes[i];
474 if (pagesize != 64*K && pagesize != 16*M) {
475 continue;
476 }
477 bool can_use = false;
478 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
479 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
480 IPC_CREAT | S_IRUSR | S_IWUSR);
481 guarantee0(shmid != -1); // Should always work.
482 // Try to set pagesize.
483 struct shmid_ds shm_buf = { 0 };
484 shm_buf.shm_pagesize = pagesize;
485 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
486 const int en = errno;
487 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
488 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
489 errno);
490 } else {
491 // Attach and double check pageisze.
492 void* p = ::shmat(shmid, NULL, 0);
493 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
494 guarantee0(p != (void*) -1); // Should always work.
495 const size_t real_pagesize = os::Aix::query_pagesize(p);
496 if (real_pagesize != pagesize) {
497 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
498 } else {
499 can_use = true;
500 }
501 ::shmdt(p);
502 }
503 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
504 if (pagesize == 64*K) {
505 g_multipage_support.can_use_64K_pages = can_use;
506 } else if (pagesize == 16*M) {
507 g_multipage_support.can_use_16M_pages = can_use;
508 }
509 }
510
511 } // end: check which pages can be used for shared memory
512
513 query_multipage_support_end:
514
515 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
516 describe_pagesize(g_multipage_support.pagesize));
517 trcVerbose("Data page size (C-Heap, bss, etc): %s",
518 describe_pagesize(g_multipage_support.datapsize));
519 trcVerbose("Text page size: %s",
520 describe_pagesize(g_multipage_support.textpsize));
521 trcVerbose("Thread stack page size (pthread): %s",
522 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
523 trcVerbose("Default shared memory page size: %s",
524 describe_pagesize(g_multipage_support.shmpsize));
525 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
526 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
527 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
528 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
529 trcVerbose("Multipage error details: %d",
530 g_multipage_support.error);
531
532 // sanity checks
533 assert0(g_multipage_support.pagesize == 4*K);
534 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
535 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
536 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
537 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
538
539 }
540
541 void os::init_system_properties_values() {
542
543 #define DEFAULT_LIBPATH "/lib:/usr/lib"
544 #define EXTENSIONS_DIR "/lib/ext"
545
546 // Buffer that fits several sprintfs.
547 // Note that the space for the trailing null is provided
548 // by the nulls included by the sizeof operator.
549 const size_t bufsize =
550 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
551 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
552 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
553
554 // sysclasspath, java_home, dll_dir
555 {
556 char *pslash;
557 os::jvm_path(buf, bufsize);
558
559 // Found the full path to libjvm.so.
560 // Now cut the path to <java_home>/jre if we can.
561 pslash = strrchr(buf, '/');
562 if (pslash != NULL) {
563 *pslash = '\0'; // Get rid of /libjvm.so.
564 }
565 pslash = strrchr(buf, '/');
566 if (pslash != NULL) {
567 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
568 }
569 Arguments::set_dll_dir(buf);
570
571 if (pslash != NULL) {
572 pslash = strrchr(buf, '/');
573 if (pslash != NULL) {
574 *pslash = '\0'; // Get rid of /lib.
575 }
576 }
577 Arguments::set_java_home(buf);
578 set_boot_path('/', ':');
579 }
580
581 // Where to look for native libraries.
582
583 // On Aix we get the user setting of LIBPATH.
584 // Eventually, all the library path setting will be done here.
585 // Get the user setting of LIBPATH.
586 const char *v = ::getenv("LIBPATH");
587 const char *v_colon = ":";
588 if (v == NULL) { v = ""; v_colon = ""; }
589
590 // Concatenate user and invariant part of ld_library_path.
591 // That's +1 for the colon and +1 for the trailing '\0'.
592 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
593 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
594 Arguments::set_library_path(ld_library_path);
595 FREE_C_HEAP_ARRAY(char, ld_library_path);
596
597 // Extensions directories.
598 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
599 Arguments::set_ext_dirs(buf);
600
601 FREE_C_HEAP_ARRAY(char, buf);
602
603 #undef DEFAULT_LIBPATH
604 #undef EXTENSIONS_DIR
605 }
606
607 ////////////////////////////////////////////////////////////////////////////////
608 // breakpoint support
609
610 void os::breakpoint() {
611 BREAKPOINT;
612 }
613
614 extern "C" void breakpoint() {
615 // use debugger to set breakpoint here
616 }
617
618 ////////////////////////////////////////////////////////////////////////////////
619 // signal support
620
621 debug_only(static bool signal_sets_initialized = false);
622 static sigset_t unblocked_sigs, vm_sigs;
623
624 bool os::Aix::is_sig_ignored(int sig) {
625 struct sigaction oact;
626 sigaction(sig, (struct sigaction*)NULL, &oact);
627 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
628 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
629 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
630 return true;
631 } else {
632 return false;
633 }
634 }
635
636 void os::Aix::signal_sets_init() {
637 // Should also have an assertion stating we are still single-threaded.
638 assert(!signal_sets_initialized, "Already initialized");
639 // Fill in signals that are necessarily unblocked for all threads in
640 // the VM. Currently, we unblock the following signals:
641 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
642 // by -Xrs (=ReduceSignalUsage));
643 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
644 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
645 // the dispositions or masks wrt these signals.
646 // Programs embedding the VM that want to use the above signals for their
647 // own purposes must, at this time, use the "-Xrs" option to prevent
648 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
649 // (See bug 4345157, and other related bugs).
650 // In reality, though, unblocking these signals is really a nop, since
651 // these signals are not blocked by default.
652 sigemptyset(&unblocked_sigs);
653 sigaddset(&unblocked_sigs, SIGILL);
654 sigaddset(&unblocked_sigs, SIGSEGV);
655 sigaddset(&unblocked_sigs, SIGBUS);
656 sigaddset(&unblocked_sigs, SIGFPE);
657 sigaddset(&unblocked_sigs, SIGTRAP);
658 sigaddset(&unblocked_sigs, SR_signum);
659
660 if (!ReduceSignalUsage) {
661 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
662 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
663 }
664 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
665 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
666 }
667 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
668 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
669 }
670 }
671 // Fill in signals that are blocked by all but the VM thread.
672 sigemptyset(&vm_sigs);
673 if (!ReduceSignalUsage)
674 sigaddset(&vm_sigs, BREAK_SIGNAL);
675 debug_only(signal_sets_initialized = true);
676 }
677
678 // These are signals that are unblocked while a thread is running Java.
679 // (For some reason, they get blocked by default.)
680 sigset_t* os::Aix::unblocked_signals() {
681 assert(signal_sets_initialized, "Not initialized");
682 return &unblocked_sigs;
683 }
684
685 // These are the signals that are blocked while a (non-VM) thread is
686 // running Java. Only the VM thread handles these signals.
687 sigset_t* os::Aix::vm_signals() {
688 assert(signal_sets_initialized, "Not initialized");
689 return &vm_sigs;
690 }
691
692 void os::Aix::hotspot_sigmask(Thread* thread) {
693
694 //Save caller's signal mask before setting VM signal mask
695 sigset_t caller_sigmask;
696 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
697
698 OSThread* osthread = thread->osthread();
699 osthread->set_caller_sigmask(caller_sigmask);
700
701 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
702
703 if (!ReduceSignalUsage) {
704 if (thread->is_VM_thread()) {
705 // Only the VM thread handles BREAK_SIGNAL ...
706 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
707 } else {
708 // ... all other threads block BREAK_SIGNAL
709 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
710 }
711 }
712 }
713
714 // retrieve memory information.
715 // Returns false if something went wrong;
716 // content of pmi undefined in this case.
717 bool os::Aix::get_meminfo(meminfo_t* pmi) {
718
719 assert(pmi, "get_meminfo: invalid parameter");
720
721 memset(pmi, 0, sizeof(meminfo_t));
722
723 if (os::Aix::on_pase()) {
724 // On PASE, use the libo4 porting library.
725
726 unsigned long long virt_total = 0;
727 unsigned long long real_total = 0;
728 unsigned long long real_free = 0;
729 unsigned long long pgsp_total = 0;
730 unsigned long long pgsp_free = 0;
731 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
732 pmi->virt_total = virt_total;
733 pmi->real_total = real_total;
734 pmi->real_free = real_free;
735 pmi->pgsp_total = pgsp_total;
736 pmi->pgsp_free = pgsp_free;
737 return true;
738 }
739 return false;
740
741 } else {
742
743 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
744 // See:
745 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
746 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
747 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
748 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
749
750 perfstat_memory_total_t psmt;
751 memset (&psmt, '\0', sizeof(psmt));
752 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
753 if (rc == -1) {
754 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
755 assert(0, "perfstat_memory_total() failed");
756 return false;
757 }
758
759 assert(rc == 1, "perfstat_memory_total() - weird return code");
760
761 // excerpt from
762 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
763 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
764 // The fields of perfstat_memory_total_t:
765 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
766 // u_longlong_t real_total Total real memory (in 4 KB pages).
767 // u_longlong_t real_free Free real memory (in 4 KB pages).
768 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
769 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
770
771 pmi->virt_total = psmt.virt_total * 4096;
772 pmi->real_total = psmt.real_total * 4096;
773 pmi->real_free = psmt.real_free * 4096;
774 pmi->pgsp_total = psmt.pgsp_total * 4096;
775 pmi->pgsp_free = psmt.pgsp_free * 4096;
776
777 return true;
778
779 }
780 } // end os::Aix::get_meminfo
781
782 //////////////////////////////////////////////////////////////////////////////
783 // create new thread
784
785 // Thread start routine for all newly created threads
786 static void *thread_native_entry(Thread *thread) {
787
788 // find out my own stack dimensions
789 {
790 // actually, this should do exactly the same as thread->record_stack_base_and_size...
791 thread->set_stack_base(os::current_stack_base());
792 thread->set_stack_size(os::current_stack_size());
793 }
794
795 const pthread_t pthread_id = ::pthread_self();
796 const tid_t kernel_thread_id = ::thread_self();
797
798 LogTarget(Info, os, thread) lt;
799 if (lt.is_enabled()) {
800 address low_address = thread->stack_end();
801 address high_address = thread->stack_base();
802 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
803 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
804 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
805 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
806 }
807
808 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
809 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
810 // tools hook pthread_create(). In this case, we may run into problems establishing
811 // guard pages on those stacks, because the stacks may reside in memory which is not
812 // protectable (shmated).
813 if (thread->stack_base() > ::sbrk(0)) {
814 log_warning(os, thread)("Thread stack not in data segment.");
815 }
816
817 // Try to randomize the cache line index of hot stack frames.
818 // This helps when threads of the same stack traces evict each other's
819 // cache lines. The threads can be either from the same JVM instance, or
820 // from different JVM instances. The benefit is especially true for
821 // processors with hyperthreading technology.
822
823 static int counter = 0;
824 int pid = os::current_process_id();
825 alloca(((pid ^ counter++) & 7) * 128);
826
827 thread->initialize_thread_current();
828
829 OSThread* osthread = thread->osthread();
830
831 // Thread_id is pthread id.
832 osthread->set_thread_id(pthread_id);
833
834 // .. but keep kernel thread id too for diagnostics
835 osthread->set_kernel_thread_id(kernel_thread_id);
836
837 // Initialize signal mask for this thread.
838 os::Aix::hotspot_sigmask(thread);
839
840 // Initialize floating point control register.
841 os::Aix::init_thread_fpu_state();
842
843 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
844
845 // Call one more level start routine.
846 thread->run();
847
848 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
849 os::current_thread_id(), (uintx) kernel_thread_id);
850
851 // If a thread has not deleted itself ("delete this") as part of its
852 // termination sequence, we have to ensure thread-local-storage is
853 // cleared before we actually terminate. No threads should ever be
854 // deleted asynchronously with respect to their termination.
855 if (Thread::current_or_null_safe() != NULL) {
856 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
857 thread->clear_thread_current();
858 }
859
860 return 0;
861 }
862
863 bool os::create_thread(Thread* thread, ThreadType thr_type,
864 size_t req_stack_size) {
865
866 assert(thread->osthread() == NULL, "caller responsible");
867
868 // Allocate the OSThread object.
869 OSThread* osthread = new OSThread(NULL, NULL);
870 if (osthread == NULL) {
871 return false;
872 }
873
874 // Set the correct thread state.
875 osthread->set_thread_type(thr_type);
876
877 // Initial state is ALLOCATED but not INITIALIZED
878 osthread->set_state(ALLOCATED);
879
880 thread->set_osthread(osthread);
881
882 // Init thread attributes.
883 pthread_attr_t attr;
884 pthread_attr_init(&attr);
885 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
886
887 // Make sure we run in 1:1 kernel-user-thread mode.
888 if (os::Aix::on_aix()) {
889 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
890 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
891 }
892
893 // Start in suspended state, and in os::thread_start, wake the thread up.
894 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
895
896 // Calculate stack size if it's not specified by caller.
897 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
898
899 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
900 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
901 // This very much looks like a pthread lib error. As a workaround, increase the stack size
902 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
903 if (stack_size < 4096 * K) {
904 stack_size += 64 * K;
905 }
906
907 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
908 // thread size in attr unchanged. If this is the minimal stack size as set
909 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
910 // guard pages might not fit on the tiny stack created.
911 int ret = pthread_attr_setstacksize(&attr, stack_size);
912 if (ret != 0) {
913 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
914 stack_size / K);
915 }
916
917 // Save some cycles and a page by disabling OS guard pages where we have our own
918 // VM guard pages (in java threads). For other threads, keep system default guard
919 // pages in place.
920 if (thr_type == java_thread || thr_type == compiler_thread) {
921 ret = pthread_attr_setguardsize(&attr, 0);
922 }
923
924 pthread_t tid = 0;
925 if (ret == 0) {
926 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
927 }
928
929 if (ret == 0) {
930 char buf[64];
931 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
932 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
933 } else {
934 char buf[64];
935 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
936 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
937 }
938
939 pthread_attr_destroy(&attr);
940
941 if (ret != 0) {
942 // Need to clean up stuff we've allocated so far.
943 thread->set_osthread(NULL);
944 delete osthread;
945 return false;
946 }
947
948 // OSThread::thread_id is the pthread id.
949 osthread->set_thread_id(tid);
950
951 return true;
952 }
953
954 /////////////////////////////////////////////////////////////////////////////
955 // attach existing thread
956
957 // bootstrap the main thread
958 bool os::create_main_thread(JavaThread* thread) {
959 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
960 return create_attached_thread(thread);
961 }
962
963 bool os::create_attached_thread(JavaThread* thread) {
964 #ifdef ASSERT
965 thread->verify_not_published();
966 #endif
967
968 // Allocate the OSThread object
969 OSThread* osthread = new OSThread(NULL, NULL);
970
971 if (osthread == NULL) {
972 return false;
973 }
974
975 const pthread_t pthread_id = ::pthread_self();
976 const tid_t kernel_thread_id = ::thread_self();
977
978 // OSThread::thread_id is the pthread id.
979 osthread->set_thread_id(pthread_id);
980
981 // .. but keep kernel thread id too for diagnostics
982 osthread->set_kernel_thread_id(kernel_thread_id);
983
984 // initialize floating point control register
985 os::Aix::init_thread_fpu_state();
986
987 // Initial thread state is RUNNABLE
988 osthread->set_state(RUNNABLE);
989
990 thread->set_osthread(osthread);
991
992 if (UseNUMA) {
993 int lgrp_id = os::numa_get_group_id();
994 if (lgrp_id != -1) {
995 thread->set_lgrp_id(lgrp_id);
996 }
997 }
998
999 // initialize signal mask for this thread
1000 // and save the caller's signal mask
1001 os::Aix::hotspot_sigmask(thread);
1002
1003 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
1004 os::current_thread_id(), (uintx) kernel_thread_id);
1005
1006 return true;
1007 }
1008
1009 void os::pd_start_thread(Thread* thread) {
1010 int status = pthread_continue_np(thread->osthread()->pthread_id());
1011 assert(status == 0, "thr_continue failed");
1012 }
1013
1014 // Free OS resources related to the OSThread
1015 void os::free_thread(OSThread* osthread) {
1016 assert(osthread != NULL, "osthread not set");
1017
1018 // We are told to free resources of the argument thread,
1019 // but we can only really operate on the current thread.
1020 assert(Thread::current()->osthread() == osthread,
1021 "os::free_thread but not current thread");
1022
1023 // Restore caller's signal mask
1024 sigset_t sigmask = osthread->caller_sigmask();
1025 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1026
1027 delete osthread;
1028 }
1029
1030 ////////////////////////////////////////////////////////////////////////////////
1031 // time support
1032
1033 // Time since start-up in seconds to a fine granularity.
1034 // Used by VMSelfDestructTimer and the MemProfiler.
1035 double os::elapsedTime() {
1036 return (double)(os::elapsed_counter()) * 0.000001;
1037 }
1038
1039 jlong os::elapsed_counter() {
1040 timeval time;
1041 int status = gettimeofday(&time, NULL);
1042 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1043 }
1044
1045 jlong os::elapsed_frequency() {
1046 return (1000 * 1000);
1047 }
1048
1049 bool os::supports_vtime() { return true; }
1050 bool os::enable_vtime() { return false; }
1051 bool os::vtime_enabled() { return false; }
1052
1053 double os::elapsedVTime() {
1054 struct rusage usage;
1055 int retval = getrusage(RUSAGE_THREAD, &usage);
1056 if (retval == 0) {
1057 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1058 } else {
1059 // better than nothing, but not much
1060 return elapsedTime();
1061 }
1062 }
1063
1064 jlong os::javaTimeMillis() {
1065 timeval time;
1066 int status = gettimeofday(&time, NULL);
1067 assert(status != -1, "aix error at gettimeofday()");
1068 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1069 }
1070
1071 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1072 timeval time;
1073 int status = gettimeofday(&time, NULL);
1074 assert(status != -1, "aix error at gettimeofday()");
1075 seconds = jlong(time.tv_sec);
1076 nanos = jlong(time.tv_usec) * 1000;
1077 }
1078
1079 jlong os::javaTimeNanos() {
1080 if (os::Aix::on_pase()) {
1081
1082 timeval time;
1083 int status = gettimeofday(&time, NULL);
1084 assert(status != -1, "PASE error at gettimeofday()");
1085 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1086 return 1000 * usecs;
1087
1088 } else {
1089 // On AIX use the precision of processors real time clock
1090 // or time base registers.
1091 timebasestruct_t time;
1092 int rc;
1093
1094 // If the CPU has a time register, it will be used and
1095 // we have to convert to real time first. After convertion we have following data:
1096 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1097 // time.tb_low [nanoseconds after the last full second above]
1098 // We better use mread_real_time here instead of read_real_time
1099 // to ensure that we will get a monotonic increasing time.
1100 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1101 rc = time_base_to_time(&time, TIMEBASE_SZ);
1102 assert(rc != -1, "aix error at time_base_to_time()");
1103 }
1104 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1105 }
1106 }
1107
1108 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1109 info_ptr->max_value = ALL_64_BITS;
1110 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1111 info_ptr->may_skip_backward = false;
1112 info_ptr->may_skip_forward = false;
1113 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1114 }
1115
1116 // Return the real, user, and system times in seconds from an
1117 // arbitrary fixed point in the past.
1118 bool os::getTimesSecs(double* process_real_time,
1119 double* process_user_time,
1120 double* process_system_time) {
1121 struct tms ticks;
1122 clock_t real_ticks = times(&ticks);
1123
1124 if (real_ticks == (clock_t) (-1)) {
1125 return false;
1126 } else {
1127 double ticks_per_second = (double) clock_tics_per_sec;
1128 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1129 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1130 *process_real_time = ((double) real_ticks) / ticks_per_second;
1131
1132 return true;
1133 }
1134 }
1135
1136 char * os::local_time_string(char *buf, size_t buflen) {
1137 struct tm t;
1138 time_t long_time;
1139 time(&long_time);
1140 localtime_r(&long_time, &t);
1141 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1142 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1143 t.tm_hour, t.tm_min, t.tm_sec);
1144 return buf;
1145 }
1146
1147 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1148 return localtime_r(clock, res);
1149 }
1150
1151 ////////////////////////////////////////////////////////////////////////////////
1152 // runtime exit support
1153
1154 // Note: os::shutdown() might be called very early during initialization, or
1155 // called from signal handler. Before adding something to os::shutdown(), make
1156 // sure it is async-safe and can handle partially initialized VM.
1157 void os::shutdown() {
1158
1159 // allow PerfMemory to attempt cleanup of any persistent resources
1160 perfMemory_exit();
1161
1162 // needs to remove object in file system
1163 AttachListener::abort();
1164
1165 // flush buffered output, finish log files
1166 ostream_abort();
1167
1168 // Check for abort hook
1169 abort_hook_t abort_hook = Arguments::abort_hook();
1170 if (abort_hook != NULL) {
1171 abort_hook();
1172 }
1173 }
1174
1175 // Note: os::abort() might be called very early during initialization, or
1176 // called from signal handler. Before adding something to os::abort(), make
1177 // sure it is async-safe and can handle partially initialized VM.
1178 void os::abort(bool dump_core, void* siginfo, const void* context) {
1179 os::shutdown();
1180 if (dump_core) {
1181 #ifndef PRODUCT
1182 fdStream out(defaultStream::output_fd());
1183 out.print_raw("Current thread is ");
1184 char buf[16];
1185 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1186 out.print_raw_cr(buf);
1187 out.print_raw_cr("Dumping core ...");
1188 #endif
1189 ::abort(); // dump core
1190 }
1191
1192 ::exit(1);
1193 }
1194
1195 // Die immediately, no exit hook, no abort hook, no cleanup.
1196 void os::die() {
1197 ::abort();
1198 }
1199
1200 // This method is a copy of JDK's sysGetLastErrorString
1201 // from src/solaris/hpi/src/system_md.c
1202
1203 size_t os::lasterror(char *buf, size_t len) {
1204 if (errno == 0) return 0;
1205
1206 const char *s = os::strerror(errno);
1207 size_t n = ::strlen(s);
1208 if (n >= len) {
1209 n = len - 1;
1210 }
1211 ::strncpy(buf, s, n);
1212 buf[n] = '\0';
1213 return n;
1214 }
1215
1216 intx os::current_thread_id() {
1217 return (intx)pthread_self();
1218 }
1219
1220 int os::current_process_id() {
1221 return getpid();
1222 }
1223
1224 // DLL functions
1225
1226 const char* os::dll_file_extension() { return ".so"; }
1227
1228 // This must be hard coded because it's the system's temporary
1229 // directory not the java application's temp directory, ala java.io.tmpdir.
1230 const char* os::get_temp_directory() { return "/tmp"; }
1231
1232 // Check if addr is inside libjvm.so.
1233 bool os::address_is_in_vm(address addr) {
1234
1235 // Input could be a real pc or a function pointer literal. The latter
1236 // would be a function descriptor residing in the data segment of a module.
1237 loaded_module_t lm;
1238 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1239 return lm.is_in_vm;
1240 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1241 return lm.is_in_vm;
1242 } else {
1243 return false;
1244 }
1245
1246 }
1247
1248 // Resolve an AIX function descriptor literal to a code pointer.
1249 // If the input is a valid code pointer to a text segment of a loaded module,
1250 // it is returned unchanged.
1251 // If the input is a valid AIX function descriptor, it is resolved to the
1252 // code entry point.
1253 // If the input is neither a valid function descriptor nor a valid code pointer,
1254 // NULL is returned.
1255 static address resolve_function_descriptor_to_code_pointer(address p) {
1256
1257 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1258 // It is a real code pointer.
1259 return p;
1260 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1261 // Pointer to data segment, potential function descriptor.
1262 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1263 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1264 // It is a function descriptor.
1265 return code_entry;
1266 }
1267 }
1268
1269 return NULL;
1270 }
1271
1272 bool os::dll_address_to_function_name(address addr, char *buf,
1273 int buflen, int *offset,
1274 bool demangle) {
1275 if (offset) {
1276 *offset = -1;
1277 }
1278 // Buf is not optional, but offset is optional.
1279 assert(buf != NULL, "sanity check");
1280 buf[0] = '\0';
1281
1282 // Resolve function ptr literals first.
1283 addr = resolve_function_descriptor_to_code_pointer(addr);
1284 if (!addr) {
1285 return false;
1286 }
1287
1288 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1289 }
1290
1291 bool os::dll_address_to_library_name(address addr, char* buf,
1292 int buflen, int* offset) {
1293 if (offset) {
1294 *offset = -1;
1295 }
1296 // Buf is not optional, but offset is optional.
1297 assert(buf != NULL, "sanity check");
1298 buf[0] = '\0';
1299
1300 // Resolve function ptr literals first.
1301 addr = resolve_function_descriptor_to_code_pointer(addr);
1302 if (!addr) {
1303 return false;
1304 }
1305
1306 return AixSymbols::get_module_name(addr, buf, buflen);
1307 }
1308
1309 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1310 // for the same architecture as Hotspot is running on.
1311 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1312
1313 if (ebuf && ebuflen > 0) {
1314 ebuf[0] = '\0';
1315 ebuf[ebuflen - 1] = '\0';
1316 }
1317
1318 if (!filename || strlen(filename) == 0) {
1319 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1320 return NULL;
1321 }
1322
1323 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1324 void * result= ::dlopen(filename, RTLD_LAZY);
1325 if (result != NULL) {
1326 // Reload dll cache. Don't do this in signal handling.
1327 LoadedLibraries::reload();
1328 return result;
1329 } else {
1330 // error analysis when dlopen fails
1331 const char* const error_report = ::dlerror();
1332 if (error_report && ebuf && ebuflen > 0) {
1333 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1334 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1335 }
1336 }
1337 return NULL;
1338 }
1339
1340 void* os::dll_lookup(void* handle, const char* name) {
1341 void* res = dlsym(handle, name);
1342 return res;
1343 }
1344
1345 void* os::get_default_process_handle() {
1346 return (void*)::dlopen(NULL, RTLD_LAZY);
1347 }
1348
1349 void os::print_dll_info(outputStream *st) {
1350 st->print_cr("Dynamic libraries:");
1351 LoadedLibraries::print(st);
1352 }
1353
1354 void os::get_summary_os_info(char* buf, size_t buflen) {
1355 // There might be something more readable than uname results for AIX.
1356 struct utsname name;
1357 uname(&name);
1358 snprintf(buf, buflen, "%s %s", name.release, name.version);
1359 }
1360
1361 void os::print_os_info(outputStream* st) {
1362 st->print("OS:");
1363
1364 st->print("uname:");
1365 struct utsname name;
1366 uname(&name);
1367 st->print(name.sysname); st->print(" ");
1368 st->print(name.nodename); st->print(" ");
1369 st->print(name.release); st->print(" ");
1370 st->print(name.version); st->print(" ");
1371 st->print(name.machine);
1372 st->cr();
1373
1374 uint32_t ver = os::Aix::os_version();
1375 st->print_cr("AIX kernel version %u.%u.%u.%u",
1376 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1377
1378 os::Posix::print_rlimit_info(st);
1379
1380 // load average
1381 st->print("load average:");
1382 double loadavg[3] = {-1.L, -1.L, -1.L};
1383 os::loadavg(loadavg, 3);
1384 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1385 st->cr();
1386
1387 // print wpar info
1388 libperfstat::wparinfo_t wi;
1389 if (libperfstat::get_wparinfo(&wi)) {
1390 st->print_cr("wpar info");
1391 st->print_cr("name: %s", wi.name);
1392 st->print_cr("id: %d", wi.wpar_id);
1393 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1394 }
1395
1396 // print partition info
1397 libperfstat::partitioninfo_t pi;
1398 if (libperfstat::get_partitioninfo(&pi)) {
1399 st->print_cr("partition info");
1400 st->print_cr(" name: %s", pi.name);
1401 }
1402
1403 }
1404
1405 void os::print_memory_info(outputStream* st) {
1406
1407 st->print_cr("Memory:");
1408
1409 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1410 describe_pagesize(g_multipage_support.pagesize));
1411 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1412 describe_pagesize(g_multipage_support.datapsize));
1413 st->print_cr(" Text page size: %s",
1414 describe_pagesize(g_multipage_support.textpsize));
1415 st->print_cr(" Thread stack page size (pthread): %s",
1416 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1417 st->print_cr(" Default shared memory page size: %s",
1418 describe_pagesize(g_multipage_support.shmpsize));
1419 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1420 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1421 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1422 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1423 st->print_cr(" Multipage error: %d",
1424 g_multipage_support.error);
1425 st->cr();
1426 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1427
1428 // print out LDR_CNTRL because it affects the default page sizes
1429 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1430 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1431
1432 // Print out EXTSHM because it is an unsupported setting.
1433 const char* const extshm = ::getenv("EXTSHM");
1434 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1435 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1436 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1437 }
1438
1439 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1440 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1441 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1442 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1443
1444 os::Aix::meminfo_t mi;
1445 if (os::Aix::get_meminfo(&mi)) {
1446 char buffer[256];
1447 if (os::Aix::on_aix()) {
1448 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1449 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1450 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1451 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1452 } else {
1453 // PASE - Numbers are result of QWCRSSTS; they mean:
1454 // real_total: Sum of all system pools
1455 // real_free: always 0
1456 // pgsp_total: we take the size of the system ASP
1457 // pgsp_free: size of system ASP times percentage of system ASP unused
1458 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1459 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1460 st->print_cr("%% system asp used : " SIZE_FORMAT,
1461 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1462 }
1463 st->print_raw(buffer);
1464 }
1465 st->cr();
1466
1467 // Print segments allocated with os::reserve_memory.
1468 st->print_cr("internal virtual memory regions used by vm:");
1469 vmembk_print_on(st);
1470 }
1471
1472 // Get a string for the cpuinfo that is a summary of the cpu type
1473 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1474 // read _system_configuration.version
1475 switch (_system_configuration.version) {
1476 case PV_8:
1477 strncpy(buf, "Power PC 8", buflen);
1478 break;
1479 case PV_7:
1480 strncpy(buf, "Power PC 7", buflen);
1481 break;
1482 case PV_6_1:
1483 strncpy(buf, "Power PC 6 DD1.x", buflen);
1484 break;
1485 case PV_6:
1486 strncpy(buf, "Power PC 6", buflen);
1487 break;
1488 case PV_5:
1489 strncpy(buf, "Power PC 5", buflen);
1490 break;
1491 case PV_5_2:
1492 strncpy(buf, "Power PC 5_2", buflen);
1493 break;
1494 case PV_5_3:
1495 strncpy(buf, "Power PC 5_3", buflen);
1496 break;
1497 case PV_5_Compat:
1498 strncpy(buf, "PV_5_Compat", buflen);
1499 break;
1500 case PV_6_Compat:
1501 strncpy(buf, "PV_6_Compat", buflen);
1502 break;
1503 case PV_7_Compat:
1504 strncpy(buf, "PV_7_Compat", buflen);
1505 break;
1506 case PV_8_Compat:
1507 strncpy(buf, "PV_8_Compat", buflen);
1508 break;
1509 default:
1510 strncpy(buf, "unknown", buflen);
1511 }
1512 }
1513
1514 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1515 // Nothing to do beyond of what os::print_cpu_info() does.
1516 }
1517
1518 static void print_signal_handler(outputStream* st, int sig,
1519 char* buf, size_t buflen);
1520
1521 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1522 st->print_cr("Signal Handlers:");
1523 print_signal_handler(st, SIGSEGV, buf, buflen);
1524 print_signal_handler(st, SIGBUS , buf, buflen);
1525 print_signal_handler(st, SIGFPE , buf, buflen);
1526 print_signal_handler(st, SIGPIPE, buf, buflen);
1527 print_signal_handler(st, SIGXFSZ, buf, buflen);
1528 print_signal_handler(st, SIGILL , buf, buflen);
1529 print_signal_handler(st, SR_signum, buf, buflen);
1530 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1531 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1532 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1533 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1534 print_signal_handler(st, SIGTRAP, buf, buflen);
1535 // We also want to know if someone else adds a SIGDANGER handler because
1536 // that will interfere with OOM killling.
1537 print_signal_handler(st, SIGDANGER, buf, buflen);
1538 }
1539
1540 static char saved_jvm_path[MAXPATHLEN] = {0};
1541
1542 // Find the full path to the current module, libjvm.so.
1543 void os::jvm_path(char *buf, jint buflen) {
1544 // Error checking.
1545 if (buflen < MAXPATHLEN) {
1546 assert(false, "must use a large-enough buffer");
1547 buf[0] = '\0';
1548 return;
1549 }
1550 // Lazy resolve the path to current module.
1551 if (saved_jvm_path[0] != 0) {
1552 strcpy(buf, saved_jvm_path);
1553 return;
1554 }
1555
1556 Dl_info dlinfo;
1557 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1558 assert(ret != 0, "cannot locate libjvm");
1559 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1560 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1561
1562 if (Arguments::sun_java_launcher_is_altjvm()) {
1563 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1564 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1565 // If "/jre/lib/" appears at the right place in the string, then
1566 // assume we are installed in a JDK and we're done. Otherwise, check
1567 // for a JAVA_HOME environment variable and fix up the path so it
1568 // looks like libjvm.so is installed there (append a fake suffix
1569 // hotspot/libjvm.so).
1570 const char *p = buf + strlen(buf) - 1;
1571 for (int count = 0; p > buf && count < 4; ++count) {
1572 for (--p; p > buf && *p != '/'; --p)
1573 /* empty */ ;
1574 }
1575
1576 if (strncmp(p, "/jre/lib/", 9) != 0) {
1577 // Look for JAVA_HOME in the environment.
1578 char* java_home_var = ::getenv("JAVA_HOME");
1579 if (java_home_var != NULL && java_home_var[0] != 0) {
1580 char* jrelib_p;
1581 int len;
1582
1583 // Check the current module name "libjvm.so".
1584 p = strrchr(buf, '/');
1585 if (p == NULL) {
1586 return;
1587 }
1588 assert(strstr(p, "/libjvm") == p, "invalid library name");
1589
1590 rp = os::Posix::realpath(java_home_var, buf, buflen);
1591 if (rp == NULL) {
1592 return;
1593 }
1594
1595 // determine if this is a legacy image or modules image
1596 // modules image doesn't have "jre" subdirectory
1597 len = strlen(buf);
1598 assert(len < buflen, "Ran out of buffer room");
1599 jrelib_p = buf + len;
1600 snprintf(jrelib_p, buflen-len, "/jre/lib");
1601 if (0 != access(buf, F_OK)) {
1602 snprintf(jrelib_p, buflen-len, "/lib");
1603 }
1604
1605 if (0 == access(buf, F_OK)) {
1606 // Use current module name "libjvm.so"
1607 len = strlen(buf);
1608 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1609 } else {
1610 // Go back to path of .so
1611 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1612 if (rp == NULL) {
1613 return;
1614 }
1615 }
1616 }
1617 }
1618 }
1619
1620 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1621 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1622 }
1623
1624 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1625 // no prefix required, not even "_"
1626 }
1627
1628 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1629 // no suffix required
1630 }
1631
1632 ////////////////////////////////////////////////////////////////////////////////
1633 // sun.misc.Signal support
1634
1635 static volatile jint sigint_count = 0;
1636
1637 static void
1638 UserHandler(int sig, void *siginfo, void *context) {
1639 // 4511530 - sem_post is serialized and handled by the manager thread. When
1640 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1641 // don't want to flood the manager thread with sem_post requests.
1642 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1643 return;
1644
1645 // Ctrl-C is pressed during error reporting, likely because the error
1646 // handler fails to abort. Let VM die immediately.
1647 if (sig == SIGINT && VMError::is_error_reported()) {
1648 os::die();
1649 }
1650
1651 os::signal_notify(sig);
1652 }
1653
1654 void* os::user_handler() {
1655 return CAST_FROM_FN_PTR(void*, UserHandler);
1656 }
1657
1658 extern "C" {
1659 typedef void (*sa_handler_t)(int);
1660 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1661 }
1662
1663 void* os::signal(int signal_number, void* handler) {
1664 struct sigaction sigAct, oldSigAct;
1665
1666 sigfillset(&(sigAct.sa_mask));
1667
1668 // Do not block out synchronous signals in the signal handler.
1669 // Blocking synchronous signals only makes sense if you can really
1670 // be sure that those signals won't happen during signal handling,
1671 // when the blocking applies. Normal signal handlers are lean and
1672 // do not cause signals. But our signal handlers tend to be "risky"
1673 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1674 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1675 // by a SIGILL, which was blocked due to the signal mask. The process
1676 // just hung forever. Better to crash from a secondary signal than to hang.
1677 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1678 sigdelset(&(sigAct.sa_mask), SIGBUS);
1679 sigdelset(&(sigAct.sa_mask), SIGILL);
1680 sigdelset(&(sigAct.sa_mask), SIGFPE);
1681 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1682
1683 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1684
1685 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1686
1687 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1688 // -1 means registration failed
1689 return (void *)-1;
1690 }
1691
1692 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1693 }
1694
1695 void os::signal_raise(int signal_number) {
1696 ::raise(signal_number);
1697 }
1698
1699 //
1700 // The following code is moved from os.cpp for making this
1701 // code platform specific, which it is by its very nature.
1702 //
1703
1704 // Will be modified when max signal is changed to be dynamic
1705 int os::sigexitnum_pd() {
1706 return NSIG;
1707 }
1708
1709 // a counter for each possible signal value
1710 static volatile jint pending_signals[NSIG+1] = { 0 };
1711
1712 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1713 // On AIX, we use sem_init(), sem_post(), sem_wait()
1714 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1715 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1716 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1717 // on AIX, msem_..() calls are suspected of causing problems.
1718 static sem_t sig_sem;
1719 static msemaphore* p_sig_msem = 0;
1720
1721 static void local_sem_init() {
1722 if (os::Aix::on_aix()) {
1723 int rc = ::sem_init(&sig_sem, 0, 0);
1724 guarantee(rc != -1, "sem_init failed");
1725 } else {
1726 // Memory semaphores must live in shared mem.
1727 guarantee0(p_sig_msem == NULL);
1728 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1729 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1730 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1731 }
1732 }
1733
1734 static void local_sem_post() {
1735 static bool warn_only_once = false;
1736 if (os::Aix::on_aix()) {
1737 int rc = ::sem_post(&sig_sem);
1738 if (rc == -1 && !warn_only_once) {
1739 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1740 warn_only_once = true;
1741 }
1742 } else {
1743 guarantee0(p_sig_msem != NULL);
1744 int rc = ::msem_unlock(p_sig_msem, 0);
1745 if (rc == -1 && !warn_only_once) {
1746 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1747 warn_only_once = true;
1748 }
1749 }
1750 }
1751
1752 static void local_sem_wait() {
1753 static bool warn_only_once = false;
1754 if (os::Aix::on_aix()) {
1755 int rc = ::sem_wait(&sig_sem);
1756 if (rc == -1 && !warn_only_once) {
1757 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1758 warn_only_once = true;
1759 }
1760 } else {
1761 guarantee0(p_sig_msem != NULL); // must init before use
1762 int rc = ::msem_lock(p_sig_msem, 0);
1763 if (rc == -1 && !warn_only_once) {
1764 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1765 warn_only_once = true;
1766 }
1767 }
1768 }
1769
1770 void os::signal_init_pd() {
1771 // Initialize signal structures
1772 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1773
1774 // Initialize signal semaphore
1775 local_sem_init();
1776 }
1777
1778 void os::signal_notify(int sig) {
1779 Atomic::inc(&pending_signals[sig]);
1780 local_sem_post();
1781 }
1782
1783 static int check_pending_signals() {
1784 Atomic::store(0, &sigint_count);
1785 for (;;) {
1786 for (int i = 0; i < NSIG + 1; i++) {
1787 jint n = pending_signals[i];
1788 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1789 return i;
1790 }
1791 }
1792 JavaThread *thread = JavaThread::current();
1793 ThreadBlockInVM tbivm(thread);
1794
1795 bool threadIsSuspended;
1796 do {
1797 thread->set_suspend_equivalent();
1798 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1799
1800 local_sem_wait();
1801
1802 // were we externally suspended while we were waiting?
1803 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1804 if (threadIsSuspended) {
1805 //
1806 // The semaphore has been incremented, but while we were waiting
1807 // another thread suspended us. We don't want to continue running
1808 // while suspended because that would surprise the thread that
1809 // suspended us.
1810 //
1811
1812 local_sem_post();
1813
1814 thread->java_suspend_self();
1815 }
1816 } while (threadIsSuspended);
1817 }
1818 }
1819
1820 int os::signal_wait() {
1821 return check_pending_signals();
1822 }
1823
1824 ////////////////////////////////////////////////////////////////////////////////
1825 // Virtual Memory
1826
1827 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1828
1829 #define VMEM_MAPPED 1
1830 #define VMEM_SHMATED 2
1831
1832 struct vmembk_t {
1833 int type; // 1 - mmap, 2 - shmat
1834 char* addr;
1835 size_t size; // Real size, may be larger than usersize.
1836 size_t pagesize; // page size of area
1837 vmembk_t* next;
1838
1839 bool contains_addr(char* p) const {
1840 return p >= addr && p < (addr + size);
1841 }
1842
1843 bool contains_range(char* p, size_t s) const {
1844 return contains_addr(p) && contains_addr(p + s - 1);
1845 }
1846
1847 void print_on(outputStream* os) const {
1848 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1849 " bytes, %d %s pages), %s",
1850 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1851 (type == VMEM_SHMATED ? "shmat" : "mmap")
1852 );
1853 }
1854
1855 // Check that range is a sub range of memory block (or equal to memory block);
1856 // also check that range is fully page aligned to the page size if the block.
1857 void assert_is_valid_subrange(char* p, size_t s) const {
1858 if (!contains_range(p, s)) {
1859 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1860 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1861 p, p + s, addr, addr + size);
1862 guarantee0(false);
1863 }
1864 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1865 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1866 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1867 guarantee0(false);
1868 }
1869 }
1870 };
1871
1872 static struct {
1873 vmembk_t* first;
1874 MiscUtils::CritSect cs;
1875 } vmem;
1876
1877 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1878 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1879 assert0(p);
1880 if (p) {
1881 MiscUtils::AutoCritSect lck(&vmem.cs);
1882 p->addr = addr; p->size = size;
1883 p->pagesize = pagesize;
1884 p->type = type;
1885 p->next = vmem.first;
1886 vmem.first = p;
1887 }
1888 }
1889
1890 static vmembk_t* vmembk_find(char* addr) {
1891 MiscUtils::AutoCritSect lck(&vmem.cs);
1892 for (vmembk_t* p = vmem.first; p; p = p->next) {
1893 if (p->addr <= addr && (p->addr + p->size) > addr) {
1894 return p;
1895 }
1896 }
1897 return NULL;
1898 }
1899
1900 static void vmembk_remove(vmembk_t* p0) {
1901 MiscUtils::AutoCritSect lck(&vmem.cs);
1902 assert0(p0);
1903 assert0(vmem.first); // List should not be empty.
1904 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1905 if (*pp == p0) {
1906 *pp = p0->next;
1907 ::free(p0);
1908 return;
1909 }
1910 }
1911 assert0(false); // Not found?
1912 }
1913
1914 static void vmembk_print_on(outputStream* os) {
1915 MiscUtils::AutoCritSect lck(&vmem.cs);
1916 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1917 vmi->print_on(os);
1918 os->cr();
1919 }
1920 }
1921
1922 // Reserve and attach a section of System V memory.
1923 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1924 // address. Failing that, it will attach the memory anywhere.
1925 // If <requested_addr> is NULL, function will attach the memory anywhere.
1926 //
1927 // <alignment_hint> is being ignored by this function. It is very probable however that the
1928 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1929 // Should this be not enogh, we can put more work into it.
1930 static char* reserve_shmated_memory (
1931 size_t bytes,
1932 char* requested_addr,
1933 size_t alignment_hint) {
1934
1935 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1936 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1937 bytes, requested_addr, alignment_hint);
1938
1939 // Either give me wish address or wish alignment but not both.
1940 assert0(!(requested_addr != NULL && alignment_hint != 0));
1941
1942 // We must prevent anyone from attaching too close to the
1943 // BRK because that may cause malloc OOM.
1944 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1945 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1946 "Will attach anywhere.", requested_addr);
1947 // Act like the OS refused to attach there.
1948 requested_addr = NULL;
1949 }
1950
1951 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1952 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1953 if (os::Aix::on_pase_V5R4_or_older()) {
1954 ShouldNotReachHere();
1955 }
1956
1957 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1958 const size_t size = align_up(bytes, 64*K);
1959
1960 // Reserve the shared segment.
1961 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1962 if (shmid == -1) {
1963 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1964 return NULL;
1965 }
1966
1967 // Important note:
1968 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1969 // We must right after attaching it remove it from the system. System V shm segments are global and
1970 // survive the process.
1971 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1972
1973 struct shmid_ds shmbuf;
1974 memset(&shmbuf, 0, sizeof(shmbuf));
1975 shmbuf.shm_pagesize = 64*K;
1976 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1977 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1978 size / (64*K), errno);
1979 // I want to know if this ever happens.
1980 assert(false, "failed to set page size for shmat");
1981 }
1982
1983 // Now attach the shared segment.
1984 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1985 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1986 // were not a segment boundary.
1987 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1988 const int errno_shmat = errno;
1989
1990 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1991 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1992 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1993 assert(false, "failed to remove shared memory segment!");
1994 }
1995
1996 // Handle shmat error. If we failed to attach, just return.
1997 if (addr == (char*)-1) {
1998 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1999 return NULL;
2000 }
2001
2002 // Just for info: query the real page size. In case setting the page size did not
2003 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
2004 const size_t real_pagesize = os::Aix::query_pagesize(addr);
2005 if (real_pagesize != shmbuf.shm_pagesize) {
2006 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
2007 }
2008
2009 if (addr) {
2010 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
2011 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
2012 } else {
2013 if (requested_addr != NULL) {
2014 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
2015 } else {
2016 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
2017 }
2018 }
2019
2020 // book-keeping
2021 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2022 assert0(is_aligned_to(addr, os::vm_page_size()));
2023
2024 return addr;
2025 }
2026
2027 static bool release_shmated_memory(char* addr, size_t size) {
2028
2029 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2030 addr, addr + size - 1);
2031
2032 bool rc = false;
2033
2034 // TODO: is there a way to verify shm size without doing bookkeeping?
2035 if (::shmdt(addr) != 0) {
2036 trcVerbose("error (%d).", errno);
2037 } else {
2038 trcVerbose("ok.");
2039 rc = true;
2040 }
2041 return rc;
2042 }
2043
2044 static bool uncommit_shmated_memory(char* addr, size_t size) {
2045 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2046 addr, addr + size - 1);
2047
2048 const bool rc = my_disclaim64(addr, size);
2049
2050 if (!rc) {
2051 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2052 return false;
2053 }
2054 return true;
2055 }
2056
2057 //////////////////////////////// mmap-based routines /////////////////////////////////
2058
2059 // Reserve memory via mmap.
2060 // If <requested_addr> is given, an attempt is made to attach at the given address.
2061 // Failing that, memory is allocated at any address.
2062 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2063 // allocate at an address aligned with the given alignment. Failing that, memory
2064 // is aligned anywhere.
2065 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2066 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2067 "alignment_hint " UINTX_FORMAT "...",
2068 bytes, requested_addr, alignment_hint);
2069
2070 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2071 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2072 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2073 return NULL;
2074 }
2075
2076 // We must prevent anyone from attaching too close to the
2077 // BRK because that may cause malloc OOM.
2078 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2079 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2080 "Will attach anywhere.", requested_addr);
2081 // Act like the OS refused to attach there.
2082 requested_addr = NULL;
2083 }
2084
2085 // Specify one or the other but not both.
2086 assert0(!(requested_addr != NULL && alignment_hint > 0));
2087
2088 // In 64K mode, we claim the global page size (os::vm_page_size())
2089 // is 64K. This is one of the few points where that illusion may
2090 // break, because mmap() will always return memory aligned to 4K. So
2091 // we must ensure we only ever return memory aligned to 64k.
2092 if (alignment_hint) {
2093 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2094 } else {
2095 alignment_hint = os::vm_page_size();
2096 }
2097
2098 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2099 const size_t size = align_up(bytes, os::vm_page_size());
2100
2101 // alignment: Allocate memory large enough to include an aligned range of the right size and
2102 // cut off the leading and trailing waste pages.
2103 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2104 const size_t extra_size = size + alignment_hint;
2105
2106 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2107 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2108 int flags = MAP_ANONYMOUS | MAP_SHARED;
2109
2110 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2111 // it means if wishaddress is given but MAP_FIXED is not set.
2112 //
2113 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2114 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2115 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2116 // get clobbered.
2117 if (requested_addr != NULL) {
2118 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2119 flags |= MAP_FIXED;
2120 }
2121 }
2122
2123 char* addr = (char*)::mmap(requested_addr, extra_size,
2124 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2125
2126 if (addr == MAP_FAILED) {
2127 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2128 return NULL;
2129 }
2130
2131 // Handle alignment.
2132 char* const addr_aligned = align_up(addr, alignment_hint);
2133 const size_t waste_pre = addr_aligned - addr;
2134 char* const addr_aligned_end = addr_aligned + size;
2135 const size_t waste_post = extra_size - waste_pre - size;
2136 if (waste_pre > 0) {
2137 ::munmap(addr, waste_pre);
2138 }
2139 if (waste_post > 0) {
2140 ::munmap(addr_aligned_end, waste_post);
2141 }
2142 addr = addr_aligned;
2143
2144 if (addr) {
2145 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2146 addr, addr + bytes, bytes);
2147 } else {
2148 if (requested_addr != NULL) {
2149 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2150 } else {
2151 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2152 }
2153 }
2154
2155 // bookkeeping
2156 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2157
2158 // Test alignment, see above.
2159 assert0(is_aligned_to(addr, os::vm_page_size()));
2160
2161 return addr;
2162 }
2163
2164 static bool release_mmaped_memory(char* addr, size_t size) {
2165 assert0(is_aligned_to(addr, os::vm_page_size()));
2166 assert0(is_aligned_to(size, os::vm_page_size()));
2167
2168 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2169 addr, addr + size - 1);
2170 bool rc = false;
2171
2172 if (::munmap(addr, size) != 0) {
2173 trcVerbose("failed (%d)\n", errno);
2174 rc = false;
2175 } else {
2176 trcVerbose("ok.");
2177 rc = true;
2178 }
2179
2180 return rc;
2181 }
2182
2183 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2184
2185 assert0(is_aligned_to(addr, os::vm_page_size()));
2186 assert0(is_aligned_to(size, os::vm_page_size()));
2187
2188 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2189 addr, addr + size - 1);
2190 bool rc = false;
2191
2192 // Uncommit mmap memory with msync MS_INVALIDATE.
2193 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2194 trcVerbose("failed (%d)\n", errno);
2195 rc = false;
2196 } else {
2197 trcVerbose("ok.");
2198 rc = true;
2199 }
2200
2201 return rc;
2202 }
2203
2204 int os::vm_page_size() {
2205 // Seems redundant as all get out.
2206 assert(os::Aix::page_size() != -1, "must call os::init");
2207 return os::Aix::page_size();
2208 }
2209
2210 // Aix allocates memory by pages.
2211 int os::vm_allocation_granularity() {
2212 assert(os::Aix::page_size() != -1, "must call os::init");
2213 return os::Aix::page_size();
2214 }
2215
2216 #ifdef PRODUCT
2217 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2218 int err) {
2219 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2220 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2221 os::errno_name(err), err);
2222 }
2223 #endif
2224
2225 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2226 const char* mesg) {
2227 assert(mesg != NULL, "mesg must be specified");
2228 if (!pd_commit_memory(addr, size, exec)) {
2229 // Add extra info in product mode for vm_exit_out_of_memory():
2230 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2231 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2232 }
2233 }
2234
2235 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2236
2237 assert(is_aligned_to(addr, os::vm_page_size()),
2238 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2239 p2i(addr), os::vm_page_size());
2240 assert(is_aligned_to(size, os::vm_page_size()),
2241 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2242 size, os::vm_page_size());
2243
2244 vmembk_t* const vmi = vmembk_find(addr);
2245 guarantee0(vmi);
2246 vmi->assert_is_valid_subrange(addr, size);
2247
2248 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2249
2250 if (UseExplicitCommit) {
2251 // AIX commits memory on touch. So, touch all pages to be committed.
2252 for (char* p = addr; p < (addr + size); p += 4*K) {
2253 *p = '\0';
2254 }
2255 }
2256
2257 return true;
2258 }
2259
2260 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2261 return pd_commit_memory(addr, size, exec);
2262 }
2263
2264 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2265 size_t alignment_hint, bool exec,
2266 const char* mesg) {
2267 // Alignment_hint is ignored on this OS.
2268 pd_commit_memory_or_exit(addr, size, exec, mesg);
2269 }
2270
2271 bool os::pd_uncommit_memory(char* addr, size_t size) {
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 // Dynamically do different things for mmap/shmat.
2280 const vmembk_t* const vmi = vmembk_find(addr);
2281 guarantee0(vmi);
2282 vmi->assert_is_valid_subrange(addr, size);
2283
2284 if (vmi->type == VMEM_SHMATED) {
2285 return uncommit_shmated_memory(addr, size);
2286 } else {
2287 return uncommit_mmaped_memory(addr, size);
2288 }
2289 }
2290
2291 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2292 // Do not call this; no need to commit stack pages on AIX.
2293 ShouldNotReachHere();
2294 return true;
2295 }
2296
2297 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2298 // Do not call this; no need to commit stack pages on AIX.
2299 ShouldNotReachHere();
2300 return true;
2301 }
2302
2303 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2304 }
2305
2306 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2307 }
2308
2309 void os::numa_make_global(char *addr, size_t bytes) {
2310 }
2311
2312 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2313 }
2314
2315 bool os::numa_topology_changed() {
2316 return false;
2317 }
2318
2319 size_t os::numa_get_groups_num() {
2320 return 1;
2321 }
2322
2323 int os::numa_get_group_id() {
2324 return 0;
2325 }
2326
2327 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2328 if (size > 0) {
2329 ids[0] = 0;
2330 return 1;
2331 }
2332 return 0;
2333 }
2334
2335 bool os::get_page_info(char *start, page_info* info) {
2336 return false;
2337 }
2338
2339 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2340 return end;
2341 }
2342
2343 // Reserves and attaches a shared memory segment.
2344 // Will assert if a wish address is given and could not be obtained.
2345 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2346
2347 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2348 // thereby clobbering old mappings at that place. That is probably
2349 // not intended, never used and almost certainly an error were it
2350 // ever be used this way (to try attaching at a specified address
2351 // without clobbering old mappings an alternate API exists,
2352 // os::attempt_reserve_memory_at()).
2353 // Instead of mimicking the dangerous coding of the other platforms, here I
2354 // just ignore the request address (release) or assert(debug).
2355 assert0(requested_addr == NULL);
2356
2357 // Always round to os::vm_page_size(), which may be larger than 4K.
2358 bytes = align_up(bytes, os::vm_page_size());
2359 const size_t alignment_hint0 =
2360 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2361
2362 // In 4K mode always use mmap.
2363 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2364 if (os::vm_page_size() == 4*K) {
2365 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2366 } else {
2367 if (bytes >= Use64KPagesThreshold) {
2368 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2369 } else {
2370 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2371 }
2372 }
2373 }
2374
2375 bool os::pd_release_memory(char* addr, size_t size) {
2376
2377 // Dynamically do different things for mmap/shmat.
2378 vmembk_t* const vmi = vmembk_find(addr);
2379 guarantee0(vmi);
2380
2381 // Always round to os::vm_page_size(), which may be larger than 4K.
2382 size = align_up(size, os::vm_page_size());
2383 addr = align_up(addr, os::vm_page_size());
2384
2385 bool rc = false;
2386 bool remove_bookkeeping = false;
2387 if (vmi->type == VMEM_SHMATED) {
2388 // For shmatted memory, we do:
2389 // - If user wants to release the whole range, release the memory (shmdt).
2390 // - If user only wants to release a partial range, uncommit (disclaim) that
2391 // range. That way, at least, we do not use memory anymore (bust still page
2392 // table space).
2393 vmi->assert_is_valid_subrange(addr, size);
2394 if (addr == vmi->addr && size == vmi->size) {
2395 rc = release_shmated_memory(addr, size);
2396 remove_bookkeeping = true;
2397 } else {
2398 rc = uncommit_shmated_memory(addr, size);
2399 }
2400 } else {
2401 // User may unmap partial regions but region has to be fully contained.
2402 #ifdef ASSERT
2403 vmi->assert_is_valid_subrange(addr, size);
2404 #endif
2405 rc = release_mmaped_memory(addr, size);
2406 remove_bookkeeping = true;
2407 }
2408
2409 // update bookkeeping
2410 if (rc && remove_bookkeeping) {
2411 vmembk_remove(vmi);
2412 }
2413
2414 return rc;
2415 }
2416
2417 static bool checked_mprotect(char* addr, size_t size, int prot) {
2418
2419 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2420 // not tell me if protection failed when trying to protect an un-protectable range.
2421 //
2422 // This means if the memory was allocated using shmget/shmat, protection wont work
2423 // but mprotect will still return 0:
2424 //
2425 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2426
2427 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2428
2429 if (!rc) {
2430 const char* const s_errno = os::errno_name(errno);
2431 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2432 return false;
2433 }
2434
2435 // mprotect success check
2436 //
2437 // Mprotect said it changed the protection but can I believe it?
2438 //
2439 // To be sure I need to check the protection afterwards. Try to
2440 // read from protected memory and check whether that causes a segfault.
2441 //
2442 if (!os::Aix::xpg_sus_mode()) {
2443
2444 if (CanUseSafeFetch32()) {
2445
2446 const bool read_protected =
2447 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2448 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2449
2450 if (prot & PROT_READ) {
2451 rc = !read_protected;
2452 } else {
2453 rc = read_protected;
2454 }
2455
2456 if (!rc) {
2457 if (os::Aix::on_pase()) {
2458 // There is an issue on older PASE systems where mprotect() will return success but the
2459 // memory will not be protected.
2460 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2461 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2462 // a stack. It is an OS error.
2463 //
2464 // A valid strategy is just to try again. This usually works. :-/
2465
2466 ::usleep(1000);
2467 if (::mprotect(addr, size, prot) == 0) {
2468 const bool read_protected_2 =
2469 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2470 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2471 rc = true;
2472 }
2473 }
2474 }
2475 }
2476 }
2477
2478 assert(rc == true, "mprotect failed.");
2479
2480 return rc;
2481 }
2482
2483 // Set protections specified
2484 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2485 unsigned int p = 0;
2486 switch (prot) {
2487 case MEM_PROT_NONE: p = PROT_NONE; break;
2488 case MEM_PROT_READ: p = PROT_READ; break;
2489 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2490 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2491 default:
2492 ShouldNotReachHere();
2493 }
2494 // is_committed is unused.
2495 return checked_mprotect(addr, size, p);
2496 }
2497
2498 bool os::guard_memory(char* addr, size_t size) {
2499 return checked_mprotect(addr, size, PROT_NONE);
2500 }
2501
2502 bool os::unguard_memory(char* addr, size_t size) {
2503 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2504 }
2505
2506 // Large page support
2507
2508 static size_t _large_page_size = 0;
2509
2510 // Enable large page support if OS allows that.
2511 void os::large_page_init() {
2512 return; // Nothing to do. See query_multipage_support and friends.
2513 }
2514
2515 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2516 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2517 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2518 // so this is not needed.
2519 assert(false, "should not be called on AIX");
2520 return NULL;
2521 }
2522
2523 bool os::release_memory_special(char* base, size_t bytes) {
2524 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2525 Unimplemented();
2526 return false;
2527 }
2528
2529 size_t os::large_page_size() {
2530 return _large_page_size;
2531 }
2532
2533 bool os::can_commit_large_page_memory() {
2534 // Does not matter, we do not support huge pages.
2535 return false;
2536 }
2537
2538 bool os::can_execute_large_page_memory() {
2539 // Does not matter, we do not support huge pages.
2540 return false;
2541 }
2542
2543 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2544 assert(file_desc >= 0, "file_desc is not valid");
2545 char* result = NULL;
2546
2547 // Always round to os::vm_page_size(), which may be larger than 4K.
2548 bytes = align_up(bytes, os::vm_page_size());
2549 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2550
2551 if (result != NULL) {
2552 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2553 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2554 }
2555 }
2556 return result;
2557 }
2558
2559 // Reserve memory at an arbitrary address, only if that area is
2560 // available (and not reserved for something else).
2561 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2562 char* addr = NULL;
2563
2564 // Always round to os::vm_page_size(), which may be larger than 4K.
2565 bytes = align_up(bytes, os::vm_page_size());
2566
2567 // In 4K mode always use mmap.
2568 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2569 if (os::vm_page_size() == 4*K) {
2570 return reserve_mmaped_memory(bytes, requested_addr, 0);
2571 } else {
2572 if (bytes >= Use64KPagesThreshold) {
2573 return reserve_shmated_memory(bytes, requested_addr, 0);
2574 } else {
2575 return reserve_mmaped_memory(bytes, requested_addr, 0);
2576 }
2577 }
2578
2579 return addr;
2580 }
2581
2582 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2583 return ::read(fd, buf, nBytes);
2584 }
2585
2586 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2587 return ::pread(fd, buf, nBytes, offset);
2588 }
2589
2590 void os::naked_short_sleep(jlong ms) {
2591 struct timespec req;
2592
2593 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2594 req.tv_sec = 0;
2595 if (ms > 0) {
2596 req.tv_nsec = (ms % 1000) * 1000000;
2597 }
2598 else {
2599 req.tv_nsec = 1;
2600 }
2601
2602 nanosleep(&req, NULL);
2603
2604 return;
2605 }
2606
2607 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2608 void os::infinite_sleep() {
2609 while (true) { // sleep forever ...
2610 ::sleep(100); // ... 100 seconds at a time
2611 }
2612 }
2613
2614 // Used to convert frequent JVM_Yield() to nops
2615 bool os::dont_yield() {
2616 return DontYieldALot;
2617 }
2618
2619 void os::naked_yield() {
2620 sched_yield();
2621 }
2622
2623 ////////////////////////////////////////////////////////////////////////////////
2624 // thread priority support
2625
2626 // From AIX manpage to pthread_setschedparam
2627 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2628 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2629 //
2630 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2631 // range from 40 to 80, where 40 is the least favored priority and 80
2632 // is the most favored."
2633 //
2634 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2635 // scheduling there; however, this still leaves iSeries.)
2636 //
2637 // We use the same values for AIX and PASE.
2638 int os::java_to_os_priority[CriticalPriority + 1] = {
2639 54, // 0 Entry should never be used
2640
2641 55, // 1 MinPriority
2642 55, // 2
2643 56, // 3
2644
2645 56, // 4
2646 57, // 5 NormPriority
2647 57, // 6
2648
2649 58, // 7
2650 58, // 8
2651 59, // 9 NearMaxPriority
2652
2653 60, // 10 MaxPriority
2654
2655 60 // 11 CriticalPriority
2656 };
2657
2658 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2659 if (!UseThreadPriorities) return OS_OK;
2660 pthread_t thr = thread->osthread()->pthread_id();
2661 int policy = SCHED_OTHER;
2662 struct sched_param param;
2663 param.sched_priority = newpri;
2664 int ret = pthread_setschedparam(thr, policy, ¶m);
2665
2666 if (ret != 0) {
2667 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2668 (int)thr, newpri, ret, os::errno_name(ret));
2669 }
2670 return (ret == 0) ? OS_OK : OS_ERR;
2671 }
2672
2673 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2674 if (!UseThreadPriorities) {
2675 *priority_ptr = java_to_os_priority[NormPriority];
2676 return OS_OK;
2677 }
2678 pthread_t thr = thread->osthread()->pthread_id();
2679 int policy = SCHED_OTHER;
2680 struct sched_param param;
2681 int ret = pthread_getschedparam(thr, &policy, ¶m);
2682 *priority_ptr = param.sched_priority;
2683
2684 return (ret == 0) ? OS_OK : OS_ERR;
2685 }
2686
2687 // Hint to the underlying OS that a task switch would not be good.
2688 // Void return because it's a hint and can fail.
2689 void os::hint_no_preempt() {}
2690
2691 ////////////////////////////////////////////////////////////////////////////////
2692 // suspend/resume support
2693
2694 // The low-level signal-based suspend/resume support is a remnant from the
2695 // old VM-suspension that used to be for java-suspension, safepoints etc,
2696 // within hotspot. Currently used by JFR's OSThreadSampler
2697 //
2698 // The remaining code is greatly simplified from the more general suspension
2699 // code that used to be used.
2700 //
2701 // The protocol is quite simple:
2702 // - suspend:
2703 // - sends a signal to the target thread
2704 // - polls the suspend state of the osthread using a yield loop
2705 // - target thread signal handler (SR_handler) sets suspend state
2706 // and blocks in sigsuspend until continued
2707 // - resume:
2708 // - sets target osthread state to continue
2709 // - sends signal to end the sigsuspend loop in the SR_handler
2710 //
2711 // Note that the SR_lock plays no role in this suspend/resume protocol,
2712 // but is checked for NULL in SR_handler as a thread termination indicator.
2713 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2714 //
2715 // Note that resume_clear_context() and suspend_save_context() are needed
2716 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2717 // which in part is used by:
2718 // - Forte Analyzer: AsyncGetCallTrace()
2719 // - StackBanging: get_frame_at_stack_banging_point()
2720
2721 static void resume_clear_context(OSThread *osthread) {
2722 osthread->set_ucontext(NULL);
2723 osthread->set_siginfo(NULL);
2724 }
2725
2726 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2727 osthread->set_ucontext(context);
2728 osthread->set_siginfo(siginfo);
2729 }
2730
2731 //
2732 // Handler function invoked when a thread's execution is suspended or
2733 // resumed. We have to be careful that only async-safe functions are
2734 // called here (Note: most pthread functions are not async safe and
2735 // should be avoided.)
2736 //
2737 // Note: sigwait() is a more natural fit than sigsuspend() from an
2738 // interface point of view, but sigwait() prevents the signal hander
2739 // from being run. libpthread would get very confused by not having
2740 // its signal handlers run and prevents sigwait()'s use with the
2741 // mutex granting granting signal.
2742 //
2743 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2744 //
2745 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2746 // Save and restore errno to avoid confusing native code with EINTR
2747 // after sigsuspend.
2748 int old_errno = errno;
2749
2750 Thread* thread = Thread::current_or_null_safe();
2751 assert(thread != NULL, "Missing current thread in SR_handler");
2752
2753 // On some systems we have seen signal delivery get "stuck" until the signal
2754 // mask is changed as part of thread termination. Check that the current thread
2755 // has not already terminated (via SR_lock()) - else the following assertion
2756 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2757 // destructor has completed.
2758
2759 if (thread->SR_lock() == NULL) {
2760 return;
2761 }
2762
2763 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2764
2765 OSThread* osthread = thread->osthread();
2766
2767 os::SuspendResume::State current = osthread->sr.state();
2768 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2769 suspend_save_context(osthread, siginfo, context);
2770
2771 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2772 os::SuspendResume::State state = osthread->sr.suspended();
2773 if (state == os::SuspendResume::SR_SUSPENDED) {
2774 sigset_t suspend_set; // signals for sigsuspend()
2775
2776 // get current set of blocked signals and unblock resume signal
2777 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2778 sigdelset(&suspend_set, SR_signum);
2779
2780 // wait here until we are resumed
2781 while (1) {
2782 sigsuspend(&suspend_set);
2783
2784 os::SuspendResume::State result = osthread->sr.running();
2785 if (result == os::SuspendResume::SR_RUNNING) {
2786 break;
2787 }
2788 }
2789
2790 } else if (state == os::SuspendResume::SR_RUNNING) {
2791 // request was cancelled, continue
2792 } else {
2793 ShouldNotReachHere();
2794 }
2795
2796 resume_clear_context(osthread);
2797 } else if (current == os::SuspendResume::SR_RUNNING) {
2798 // request was cancelled, continue
2799 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2800 // ignore
2801 } else {
2802 ShouldNotReachHere();
2803 }
2804
2805 errno = old_errno;
2806 }
2807
2808 static int SR_initialize() {
2809 struct sigaction act;
2810 char *s;
2811 // Get signal number to use for suspend/resume
2812 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2813 int sig = ::strtol(s, 0, 10);
2814 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2815 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2816 SR_signum = sig;
2817 } else {
2818 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2819 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2820 }
2821 }
2822
2823 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2824 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2825
2826 sigemptyset(&SR_sigset);
2827 sigaddset(&SR_sigset, SR_signum);
2828
2829 // Set up signal handler for suspend/resume.
2830 act.sa_flags = SA_RESTART|SA_SIGINFO;
2831 act.sa_handler = (void (*)(int)) SR_handler;
2832
2833 // SR_signum is blocked by default.
2834 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2835
2836 if (sigaction(SR_signum, &act, 0) == -1) {
2837 return -1;
2838 }
2839
2840 // Save signal flag
2841 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2842 return 0;
2843 }
2844
2845 static int SR_finalize() {
2846 return 0;
2847 }
2848
2849 static int sr_notify(OSThread* osthread) {
2850 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2851 assert_status(status == 0, status, "pthread_kill");
2852 return status;
2853 }
2854
2855 // "Randomly" selected value for how long we want to spin
2856 // before bailing out on suspending a thread, also how often
2857 // we send a signal to a thread we want to resume
2858 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2859 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2860
2861 // returns true on success and false on error - really an error is fatal
2862 // but this seems the normal response to library errors
2863 static bool do_suspend(OSThread* osthread) {
2864 assert(osthread->sr.is_running(), "thread should be running");
2865 // mark as suspended and send signal
2866
2867 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2868 // failed to switch, state wasn't running?
2869 ShouldNotReachHere();
2870 return false;
2871 }
2872
2873 if (sr_notify(osthread) != 0) {
2874 // try to cancel, switch to running
2875
2876 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2877 if (result == os::SuspendResume::SR_RUNNING) {
2878 // cancelled
2879 return false;
2880 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2881 // somehow managed to suspend
2882 return true;
2883 } else {
2884 ShouldNotReachHere();
2885 return false;
2886 }
2887 }
2888
2889 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2890
2891 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2892 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2893 os::naked_yield();
2894 }
2895
2896 // timeout, try to cancel the request
2897 if (n >= RANDOMLY_LARGE_INTEGER) {
2898 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2899 if (cancelled == os::SuspendResume::SR_RUNNING) {
2900 return false;
2901 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2902 return true;
2903 } else {
2904 ShouldNotReachHere();
2905 return false;
2906 }
2907 }
2908 }
2909
2910 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2911 return true;
2912 }
2913
2914 static void do_resume(OSThread* osthread) {
2915 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2916
2917 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2918 // failed to switch to WAKEUP_REQUEST
2919 ShouldNotReachHere();
2920 return;
2921 }
2922
2923 while (!osthread->sr.is_running()) {
2924 if (sr_notify(osthread) == 0) {
2925 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2926 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2927 os::naked_yield();
2928 }
2929 }
2930 } else {
2931 ShouldNotReachHere();
2932 }
2933 }
2934
2935 guarantee(osthread->sr.is_running(), "Must be running!");
2936 }
2937
2938 ///////////////////////////////////////////////////////////////////////////////////
2939 // signal handling (except suspend/resume)
2940
2941 // This routine may be used by user applications as a "hook" to catch signals.
2942 // The user-defined signal handler must pass unrecognized signals to this
2943 // routine, and if it returns true (non-zero), then the signal handler must
2944 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2945 // routine will never retun false (zero), but instead will execute a VM panic
2946 // routine kill the process.
2947 //
2948 // If this routine returns false, it is OK to call it again. This allows
2949 // the user-defined signal handler to perform checks either before or after
2950 // the VM performs its own checks. Naturally, the user code would be making
2951 // a serious error if it tried to handle an exception (such as a null check
2952 // or breakpoint) that the VM was generating for its own correct operation.
2953 //
2954 // This routine may recognize any of the following kinds of signals:
2955 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2956 // It should be consulted by handlers for any of those signals.
2957 //
2958 // The caller of this routine must pass in the three arguments supplied
2959 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2960 // field of the structure passed to sigaction(). This routine assumes that
2961 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2962 //
2963 // Note that the VM will print warnings if it detects conflicting signal
2964 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2965 //
2966 extern "C" JNIEXPORT int
2967 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2968
2969 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2970 // to be the thing to call; documentation is not terribly clear about whether
2971 // pthread_sigmask also works, and if it does, whether it does the same.
2972 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2973 const int rc = ::pthread_sigmask(how, set, oset);
2974 // return value semantics differ slightly for error case:
2975 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2976 // (so, pthread_sigmask is more theadsafe for error handling)
2977 // But success is always 0.
2978 return rc == 0 ? true : false;
2979 }
2980
2981 // Function to unblock all signals which are, according
2982 // to POSIX, typical program error signals. If they happen while being blocked,
2983 // they typically will bring down the process immediately.
2984 bool unblock_program_error_signals() {
2985 sigset_t set;
2986 ::sigemptyset(&set);
2987 ::sigaddset(&set, SIGILL);
2988 ::sigaddset(&set, SIGBUS);
2989 ::sigaddset(&set, SIGFPE);
2990 ::sigaddset(&set, SIGSEGV);
2991 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2992 }
2993
2994 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2995 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2996 assert(info != NULL && uc != NULL, "it must be old kernel");
2997
2998 // Never leave program error signals blocked;
2999 // on all our platforms they would bring down the process immediately when
3000 // getting raised while being blocked.
3001 unblock_program_error_signals();
3002
3003 int orig_errno = errno; // Preserve errno value over signal handler.
3004 JVM_handle_aix_signal(sig, info, uc, true);
3005 errno = orig_errno;
3006 }
3007
3008 // This boolean allows users to forward their own non-matching signals
3009 // to JVM_handle_aix_signal, harmlessly.
3010 bool os::Aix::signal_handlers_are_installed = false;
3011
3012 // For signal-chaining
3013 struct sigaction sigact[NSIG];
3014 sigset_t sigs;
3015 bool os::Aix::libjsig_is_loaded = false;
3016 typedef struct sigaction *(*get_signal_t)(int);
3017 get_signal_t os::Aix::get_signal_action = NULL;
3018
3019 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
3020 struct sigaction *actp = NULL;
3021
3022 if (libjsig_is_loaded) {
3023 // Retrieve the old signal handler from libjsig
3024 actp = (*get_signal_action)(sig);
3025 }
3026 if (actp == NULL) {
3027 // Retrieve the preinstalled signal handler from jvm
3028 actp = get_preinstalled_handler(sig);
3029 }
3030
3031 return actp;
3032 }
3033
3034 static bool call_chained_handler(struct sigaction *actp, int sig,
3035 siginfo_t *siginfo, void *context) {
3036 // Call the old signal handler
3037 if (actp->sa_handler == SIG_DFL) {
3038 // It's more reasonable to let jvm treat it as an unexpected exception
3039 // instead of taking the default action.
3040 return false;
3041 } else if (actp->sa_handler != SIG_IGN) {
3042 if ((actp->sa_flags & SA_NODEFER) == 0) {
3043 // automaticlly block the signal
3044 sigaddset(&(actp->sa_mask), sig);
3045 }
3046
3047 sa_handler_t hand = NULL;
3048 sa_sigaction_t sa = NULL;
3049 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3050 // retrieve the chained handler
3051 if (siginfo_flag_set) {
3052 sa = actp->sa_sigaction;
3053 } else {
3054 hand = actp->sa_handler;
3055 }
3056
3057 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3058 actp->sa_handler = SIG_DFL;
3059 }
3060
3061 // try to honor the signal mask
3062 sigset_t oset;
3063 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3064
3065 // call into the chained handler
3066 if (siginfo_flag_set) {
3067 (*sa)(sig, siginfo, context);
3068 } else {
3069 (*hand)(sig);
3070 }
3071
3072 // restore the signal mask
3073 pthread_sigmask(SIG_SETMASK, &oset, 0);
3074 }
3075 // Tell jvm's signal handler the signal is taken care of.
3076 return true;
3077 }
3078
3079 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3080 bool chained = false;
3081 // signal-chaining
3082 if (UseSignalChaining) {
3083 struct sigaction *actp = get_chained_signal_action(sig);
3084 if (actp != NULL) {
3085 chained = call_chained_handler(actp, sig, siginfo, context);
3086 }
3087 }
3088 return chained;
3089 }
3090
3091 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3092 if (sigismember(&sigs, sig)) {
3093 return &sigact[sig];
3094 }
3095 return NULL;
3096 }
3097
3098 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3099 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3100 sigact[sig] = oldAct;
3101 sigaddset(&sigs, sig);
3102 }
3103
3104 // for diagnostic
3105 int sigflags[NSIG];
3106
3107 int os::Aix::get_our_sigflags(int sig) {
3108 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3109 return sigflags[sig];
3110 }
3111
3112 void os::Aix::set_our_sigflags(int sig, int flags) {
3113 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3114 if (sig > 0 && sig < NSIG) {
3115 sigflags[sig] = flags;
3116 }
3117 }
3118
3119 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3120 // Check for overwrite.
3121 struct sigaction oldAct;
3122 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3123
3124 void* oldhand = oldAct.sa_sigaction
3125 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3126 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3127 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3128 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3129 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3130 if (AllowUserSignalHandlers || !set_installed) {
3131 // Do not overwrite; user takes responsibility to forward to us.
3132 return;
3133 } else if (UseSignalChaining) {
3134 // save the old handler in jvm
3135 save_preinstalled_handler(sig, oldAct);
3136 // libjsig also interposes the sigaction() call below and saves the
3137 // old sigaction on it own.
3138 } else {
3139 fatal("Encountered unexpected pre-existing sigaction handler "
3140 "%#lx for signal %d.", (long)oldhand, sig);
3141 }
3142 }
3143
3144 struct sigaction sigAct;
3145 sigfillset(&(sigAct.sa_mask));
3146 if (!set_installed) {
3147 sigAct.sa_handler = SIG_DFL;
3148 sigAct.sa_flags = SA_RESTART;
3149 } else {
3150 sigAct.sa_sigaction = javaSignalHandler;
3151 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3152 }
3153 // Save flags, which are set by ours
3154 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3155 sigflags[sig] = sigAct.sa_flags;
3156
3157 int ret = sigaction(sig, &sigAct, &oldAct);
3158 assert(ret == 0, "check");
3159
3160 void* oldhand2 = oldAct.sa_sigaction
3161 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3162 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3163 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3164 }
3165
3166 // install signal handlers for signals that HotSpot needs to
3167 // handle in order to support Java-level exception handling.
3168 void os::Aix::install_signal_handlers() {
3169 if (!signal_handlers_are_installed) {
3170 signal_handlers_are_installed = true;
3171
3172 // signal-chaining
3173 typedef void (*signal_setting_t)();
3174 signal_setting_t begin_signal_setting = NULL;
3175 signal_setting_t end_signal_setting = NULL;
3176 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3177 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3178 if (begin_signal_setting != NULL) {
3179 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3180 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3181 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3182 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3183 libjsig_is_loaded = true;
3184 assert(UseSignalChaining, "should enable signal-chaining");
3185 }
3186 if (libjsig_is_loaded) {
3187 // Tell libjsig jvm is setting signal handlers.
3188 (*begin_signal_setting)();
3189 }
3190
3191 ::sigemptyset(&sigs);
3192 set_signal_handler(SIGSEGV, true);
3193 set_signal_handler(SIGPIPE, true);
3194 set_signal_handler(SIGBUS, true);
3195 set_signal_handler(SIGILL, true);
3196 set_signal_handler(SIGFPE, true);
3197 set_signal_handler(SIGTRAP, true);
3198 set_signal_handler(SIGXFSZ, true);
3199
3200 if (libjsig_is_loaded) {
3201 // Tell libjsig jvm finishes setting signal handlers.
3202 (*end_signal_setting)();
3203 }
3204
3205 // We don't activate signal checker if libjsig is in place, we trust ourselves
3206 // and if UserSignalHandler is installed all bets are off.
3207 // Log that signal checking is off only if -verbose:jni is specified.
3208 if (CheckJNICalls) {
3209 if (libjsig_is_loaded) {
3210 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3211 check_signals = false;
3212 }
3213 if (AllowUserSignalHandlers) {
3214 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3215 check_signals = false;
3216 }
3217 // Need to initialize check_signal_done.
3218 ::sigemptyset(&check_signal_done);
3219 }
3220 }
3221 }
3222
3223 static const char* get_signal_handler_name(address handler,
3224 char* buf, int buflen) {
3225 int offset;
3226 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3227 if (found) {
3228 // skip directory names
3229 const char *p1, *p2;
3230 p1 = buf;
3231 size_t len = strlen(os::file_separator());
3232 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3233 // The way os::dll_address_to_library_name is implemented on Aix
3234 // right now, it always returns -1 for the offset which is not
3235 // terribly informative.
3236 // Will fix that. For now, omit the offset.
3237 jio_snprintf(buf, buflen, "%s", p1);
3238 } else {
3239 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3240 }
3241 return buf;
3242 }
3243
3244 static void print_signal_handler(outputStream* st, int sig,
3245 char* buf, size_t buflen) {
3246 struct sigaction sa;
3247 sigaction(sig, NULL, &sa);
3248
3249 st->print("%s: ", os::exception_name(sig, buf, buflen));
3250
3251 address handler = (sa.sa_flags & SA_SIGINFO)
3252 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3253 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3254
3255 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3256 st->print("SIG_DFL");
3257 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3258 st->print("SIG_IGN");
3259 } else {
3260 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3261 }
3262
3263 // Print readable mask.
3264 st->print(", sa_mask[0]=");
3265 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3266
3267 address rh = VMError::get_resetted_sighandler(sig);
3268 // May be, handler was resetted by VMError?
3269 if (rh != NULL) {
3270 handler = rh;
3271 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3272 }
3273
3274 // Print textual representation of sa_flags.
3275 st->print(", sa_flags=");
3276 os::Posix::print_sa_flags(st, sa.sa_flags);
3277
3278 // Check: is it our handler?
3279 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3280 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3281 // It is our signal handler.
3282 // Check for flags, reset system-used one!
3283 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3284 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3285 os::Aix::get_our_sigflags(sig));
3286 }
3287 }
3288 st->cr();
3289 }
3290
3291 #define DO_SIGNAL_CHECK(sig) \
3292 if (!sigismember(&check_signal_done, sig)) \
3293 os::Aix::check_signal_handler(sig)
3294
3295 // This method is a periodic task to check for misbehaving JNI applications
3296 // under CheckJNI, we can add any periodic checks here
3297
3298 void os::run_periodic_checks() {
3299
3300 if (check_signals == false) return;
3301
3302 // SEGV and BUS if overridden could potentially prevent
3303 // generation of hs*.log in the event of a crash, debugging
3304 // such a case can be very challenging, so we absolutely
3305 // check the following for a good measure:
3306 DO_SIGNAL_CHECK(SIGSEGV);
3307 DO_SIGNAL_CHECK(SIGILL);
3308 DO_SIGNAL_CHECK(SIGFPE);
3309 DO_SIGNAL_CHECK(SIGBUS);
3310 DO_SIGNAL_CHECK(SIGPIPE);
3311 DO_SIGNAL_CHECK(SIGXFSZ);
3312 if (UseSIGTRAP) {
3313 DO_SIGNAL_CHECK(SIGTRAP);
3314 }
3315
3316 // ReduceSignalUsage allows the user to override these handlers
3317 // see comments at the very top and jvm_md.h
3318 if (!ReduceSignalUsage) {
3319 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3320 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3321 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3322 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3323 }
3324
3325 DO_SIGNAL_CHECK(SR_signum);
3326 }
3327
3328 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3329
3330 static os_sigaction_t os_sigaction = NULL;
3331
3332 void os::Aix::check_signal_handler(int sig) {
3333 char buf[O_BUFLEN];
3334 address jvmHandler = NULL;
3335
3336 struct sigaction act;
3337 if (os_sigaction == NULL) {
3338 // only trust the default sigaction, in case it has been interposed
3339 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3340 if (os_sigaction == NULL) return;
3341 }
3342
3343 os_sigaction(sig, (struct sigaction*)NULL, &act);
3344
3345 address thisHandler = (act.sa_flags & SA_SIGINFO)
3346 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3347 : CAST_FROM_FN_PTR(address, act.sa_handler);
3348
3349 switch(sig) {
3350 case SIGSEGV:
3351 case SIGBUS:
3352 case SIGFPE:
3353 case SIGPIPE:
3354 case SIGILL:
3355 case SIGXFSZ:
3356 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3357 break;
3358
3359 case SHUTDOWN1_SIGNAL:
3360 case SHUTDOWN2_SIGNAL:
3361 case SHUTDOWN3_SIGNAL:
3362 case BREAK_SIGNAL:
3363 jvmHandler = (address)user_handler();
3364 break;
3365
3366 default:
3367 if (sig == SR_signum) {
3368 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3369 } else {
3370 return;
3371 }
3372 break;
3373 }
3374
3375 if (thisHandler != jvmHandler) {
3376 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3377 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3378 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3379 // No need to check this sig any longer
3380 sigaddset(&check_signal_done, sig);
3381 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3382 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3383 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3384 exception_name(sig, buf, O_BUFLEN));
3385 }
3386 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3387 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3388 tty->print("expected:");
3389 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3390 tty->cr();
3391 tty->print(" found:");
3392 os::Posix::print_sa_flags(tty, act.sa_flags);
3393 tty->cr();
3394 // No need to check this sig any longer
3395 sigaddset(&check_signal_done, sig);
3396 }
3397
3398 // Dump all the signal
3399 if (sigismember(&check_signal_done, sig)) {
3400 print_signal_handlers(tty, buf, O_BUFLEN);
3401 }
3402 }
3403
3404 // To install functions for atexit system call
3405 extern "C" {
3406 static void perfMemory_exit_helper() {
3407 perfMemory_exit();
3408 }
3409 }
3410
3411 // This is called _before_ the most of global arguments have been parsed.
3412 void os::init(void) {
3413 // This is basic, we want to know if that ever changes.
3414 // (Shared memory boundary is supposed to be a 256M aligned.)
3415 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3416
3417 // Record process break at startup.
3418 g_brk_at_startup = (address) ::sbrk(0);
3419 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3420
3421 // First off, we need to know whether we run on AIX or PASE, and
3422 // the OS level we run on.
3423 os::Aix::initialize_os_info();
3424
3425 // Scan environment (SPEC1170 behaviour, etc).
3426 os::Aix::scan_environment();
3427
3428 // Probe multipage support.
3429 query_multipage_support();
3430
3431 // Act like we only have one page size by eliminating corner cases which
3432 // we did not support very well anyway.
3433 // We have two input conditions:
3434 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3435 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3436 // setting.
3437 // Data segment page size is important for us because it defines the thread stack page
3438 // size, which is needed for guard page handling, stack banging etc.
3439 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3440 // and should be allocated with 64k pages.
3441 //
3442 // So, we do the following:
3443 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3444 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3445 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3446 // 64k no --- AIX 5.2 ? ---
3447 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3448
3449 // We explicitly leave no option to change page size, because only upgrading would work,
3450 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3451
3452 if (g_multipage_support.datapsize == 4*K) {
3453 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3454 if (g_multipage_support.can_use_64K_pages) {
3455 // .. but we are able to use 64K pages dynamically.
3456 // This would be typical for java launchers which are not linked
3457 // with datapsize=64K (like, any other launcher but our own).
3458 //
3459 // In this case it would be smart to allocate the java heap with 64K
3460 // to get the performance benefit, and to fake 64k pages for the
3461 // data segment (when dealing with thread stacks).
3462 //
3463 // However, leave a possibility to downgrade to 4K, using
3464 // -XX:-Use64KPages.
3465 if (Use64KPages) {
3466 trcVerbose("64K page mode (faked for data segment)");
3467 Aix::_page_size = 64*K;
3468 } else {
3469 trcVerbose("4K page mode (Use64KPages=off)");
3470 Aix::_page_size = 4*K;
3471 }
3472 } else {
3473 // .. and not able to allocate 64k pages dynamically. Here, just
3474 // fall back to 4K paged mode and use mmap for everything.
3475 trcVerbose("4K page mode");
3476 Aix::_page_size = 4*K;
3477 FLAG_SET_ERGO(bool, Use64KPages, false);
3478 }
3479 } else {
3480 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3481 // This normally means that we can allocate 64k pages dynamically.
3482 // (There is one special case where this may be false: EXTSHM=on.
3483 // but we decided to not support that mode).
3484 assert0(g_multipage_support.can_use_64K_pages);
3485 Aix::_page_size = 64*K;
3486 trcVerbose("64K page mode");
3487 FLAG_SET_ERGO(bool, Use64KPages, true);
3488 }
3489
3490 // For now UseLargePages is just ignored.
3491 FLAG_SET_ERGO(bool, UseLargePages, false);
3492 _page_sizes[0] = 0;
3493
3494 // debug trace
3495 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3496
3497 // Next, we need to initialize libo4 and libperfstat libraries.
3498 if (os::Aix::on_pase()) {
3499 os::Aix::initialize_libo4();
3500 } else {
3501 os::Aix::initialize_libperfstat();
3502 }
3503
3504 // Reset the perfstat information provided by ODM.
3505 if (os::Aix::on_aix()) {
3506 libperfstat::perfstat_reset();
3507 }
3508
3509 // Now initialze basic system properties. Note that for some of the values we
3510 // need libperfstat etc.
3511 os::Aix::initialize_system_info();
3512
3513 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3514
3515 init_random(1234567);
3516
3517 // _main_thread points to the thread that created/loaded the JVM.
3518 Aix::_main_thread = pthread_self();
3519
3520 initial_time_count = os::elapsed_counter();
3521
3522 os::Posix::init();
3523 }
3524
3525 // This is called _after_ the global arguments have been parsed.
3526 jint os::init_2(void) {
3527
3528 os::Posix::init_2();
3529
3530 if (os::Aix::on_pase()) {
3531 trcVerbose("Running on PASE.");
3532 } else {
3533 trcVerbose("Running on AIX (not PASE).");
3534 }
3535
3536 trcVerbose("processor count: %d", os::_processor_count);
3537 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3538
3539 // Initially build up the loaded dll map.
3540 LoadedLibraries::reload();
3541 if (Verbose) {
3542 trcVerbose("Loaded Libraries: ");
3543 LoadedLibraries::print(tty);
3544 }
3545
3546 // initialize suspend/resume support - must do this before signal_sets_init()
3547 if (SR_initialize() != 0) {
3548 perror("SR_initialize failed");
3549 return JNI_ERR;
3550 }
3551
3552 Aix::signal_sets_init();
3553 Aix::install_signal_handlers();
3554
3555 // Check and sets minimum stack sizes against command line options
3556 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3557 return JNI_ERR;
3558 }
3559
3560 if (UseNUMA) {
3561 UseNUMA = false;
3562 warning("NUMA optimizations are not available on this OS.");
3563 }
3564
3565 if (MaxFDLimit) {
3566 // Set the number of file descriptors to max. print out error
3567 // if getrlimit/setrlimit fails but continue regardless.
3568 struct rlimit nbr_files;
3569 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3570 if (status != 0) {
3571 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3572 } else {
3573 nbr_files.rlim_cur = nbr_files.rlim_max;
3574 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3575 if (status != 0) {
3576 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3577 }
3578 }
3579 }
3580
3581 if (PerfAllowAtExitRegistration) {
3582 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3583 // At exit functions can be delayed until process exit time, which
3584 // can be problematic for embedded VM situations. Embedded VMs should
3585 // call DestroyJavaVM() to assure that VM resources are released.
3586
3587 // Note: perfMemory_exit_helper atexit function may be removed in
3588 // the future if the appropriate cleanup code can be added to the
3589 // VM_Exit VMOperation's doit method.
3590 if (atexit(perfMemory_exit_helper) != 0) {
3591 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3592 }
3593 }
3594
3595 return JNI_OK;
3596 }
3597
3598 // Mark the polling page as unreadable
3599 void os::make_polling_page_unreadable(void) {
3600 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3601 fatal("Could not disable polling page");
3602 }
3603 };
3604
3605 // Mark the polling page as readable
3606 void os::make_polling_page_readable(void) {
3607 // Changed according to os_linux.cpp.
3608 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3609 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3610 }
3611 };
3612
3613 int os::active_processor_count() {
3614 // User has overridden the number of active processors
3615 if (ActiveProcessorCount > 0) {
3616 log_trace(os)("active_processor_count: "
3617 "active processor count set by user : %d",
3618 ActiveProcessorCount);
3619 return ActiveProcessorCount;
3620 }
3621
3622 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3623 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3624 return online_cpus;
3625 }
3626
3627 void os::set_native_thread_name(const char *name) {
3628 // Not yet implemented.
3629 return;
3630 }
3631
3632 bool os::distribute_processes(uint length, uint* distribution) {
3633 // Not yet implemented.
3634 return false;
3635 }
3636
3637 bool os::bind_to_processor(uint processor_id) {
3638 // Not yet implemented.
3639 return false;
3640 }
3641
3642 void os::SuspendedThreadTask::internal_do_task() {
3643 if (do_suspend(_thread->osthread())) {
3644 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3645 do_task(context);
3646 do_resume(_thread->osthread());
3647 }
3648 }
3649
3650 ////////////////////////////////////////////////////////////////////////////////
3651 // debug support
3652
3653 bool os::find(address addr, outputStream* st) {
3654
3655 st->print(PTR_FORMAT ": ", addr);
3656
3657 loaded_module_t lm;
3658 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3659 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3660 st->print_cr("%s", lm.path);
3661 return true;
3662 }
3663
3664 return false;
3665 }
3666
3667 ////////////////////////////////////////////////////////////////////////////////
3668 // misc
3669
3670 // This does not do anything on Aix. This is basically a hook for being
3671 // able to use structured exception handling (thread-local exception filters)
3672 // on, e.g., Win32.
3673 void
3674 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3675 JavaCallArguments* args, Thread* thread) {
3676 f(value, method, args, thread);
3677 }
3678
3679 void os::print_statistics() {
3680 }
3681
3682 bool os::message_box(const char* title, const char* message) {
3683 int i;
3684 fdStream err(defaultStream::error_fd());
3685 for (i = 0; i < 78; i++) err.print_raw("=");
3686 err.cr();
3687 err.print_raw_cr(title);
3688 for (i = 0; i < 78; i++) err.print_raw("-");
3689 err.cr();
3690 err.print_raw_cr(message);
3691 for (i = 0; i < 78; i++) err.print_raw("=");
3692 err.cr();
3693
3694 char buf[16];
3695 // Prevent process from exiting upon "read error" without consuming all CPU
3696 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3697
3698 return buf[0] == 'y' || buf[0] == 'Y';
3699 }
3700
3701 int os::stat(const char *path, struct stat *sbuf) {
3702 char pathbuf[MAX_PATH];
3703 if (strlen(path) > MAX_PATH - 1) {
3704 errno = ENAMETOOLONG;
3705 return -1;
3706 }
3707 os::native_path(strcpy(pathbuf, path));
3708 return ::stat(pathbuf, sbuf);
3709 }
3710
3711 // Is a (classpath) directory empty?
3712 bool os::dir_is_empty(const char* path) {
3713 DIR *dir = NULL;
3714 struct dirent *ptr;
3715
3716 dir = opendir(path);
3717 if (dir == NULL) return true;
3718
3719 /* Scan the directory */
3720 bool result = true;
3721 char buf[sizeof(struct dirent) + MAX_PATH];
3722 while (result && (ptr = ::readdir(dir)) != NULL) {
3723 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3724 result = false;
3725 }
3726 }
3727 closedir(dir);
3728 return result;
3729 }
3730
3731 // This code originates from JDK's sysOpen and open64_w
3732 // from src/solaris/hpi/src/system_md.c
3733
3734 int os::open(const char *path, int oflag, int mode) {
3735
3736 if (strlen(path) > MAX_PATH - 1) {
3737 errno = ENAMETOOLONG;
3738 return -1;
3739 }
3740 int fd;
3741
3742 fd = ::open64(path, oflag, mode);
3743 if (fd == -1) return -1;
3744
3745 // If the open succeeded, the file might still be a directory.
3746 {
3747 struct stat64 buf64;
3748 int ret = ::fstat64(fd, &buf64);
3749 int st_mode = buf64.st_mode;
3750
3751 if (ret != -1) {
3752 if ((st_mode & S_IFMT) == S_IFDIR) {
3753 errno = EISDIR;
3754 ::close(fd);
3755 return -1;
3756 }
3757 } else {
3758 ::close(fd);
3759 return -1;
3760 }
3761 }
3762
3763 // All file descriptors that are opened in the JVM and not
3764 // specifically destined for a subprocess should have the
3765 // close-on-exec flag set. If we don't set it, then careless 3rd
3766 // party native code might fork and exec without closing all
3767 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3768 // UNIXProcess.c), and this in turn might:
3769 //
3770 // - cause end-of-file to fail to be detected on some file
3771 // descriptors, resulting in mysterious hangs, or
3772 //
3773 // - might cause an fopen in the subprocess to fail on a system
3774 // suffering from bug 1085341.
3775 //
3776 // (Yes, the default setting of the close-on-exec flag is a Unix
3777 // design flaw.)
3778 //
3779 // See:
3780 // 1085341: 32-bit stdio routines should support file descriptors >255
3781 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3782 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3783 #ifdef FD_CLOEXEC
3784 {
3785 int flags = ::fcntl(fd, F_GETFD);
3786 if (flags != -1)
3787 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3788 }
3789 #endif
3790
3791 return fd;
3792 }
3793
3794 // create binary file, rewriting existing file if required
3795 int os::create_binary_file(const char* path, bool rewrite_existing) {
3796 int oflags = O_WRONLY | O_CREAT;
3797 if (!rewrite_existing) {
3798 oflags |= O_EXCL;
3799 }
3800 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3801 }
3802
3803 // return current position of file pointer
3804 jlong os::current_file_offset(int fd) {
3805 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3806 }
3807
3808 // move file pointer to the specified offset
3809 jlong os::seek_to_file_offset(int fd, jlong offset) {
3810 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3811 }
3812
3813 // This code originates from JDK's sysAvailable
3814 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3815
3816 int os::available(int fd, jlong *bytes) {
3817 jlong cur, end;
3818 int mode;
3819 struct stat64 buf64;
3820
3821 if (::fstat64(fd, &buf64) >= 0) {
3822 mode = buf64.st_mode;
3823 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3824 int n;
3825 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3826 *bytes = n;
3827 return 1;
3828 }
3829 }
3830 }
3831 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3832 return 0;
3833 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3834 return 0;
3835 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3836 return 0;
3837 }
3838 *bytes = end - cur;
3839 return 1;
3840 }
3841
3842 // Map a block of memory.
3843 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3844 char *addr, size_t bytes, bool read_only,
3845 bool allow_exec) {
3846 int prot;
3847 int flags = MAP_PRIVATE;
3848
3849 if (read_only) {
3850 prot = PROT_READ;
3851 flags = MAP_SHARED;
3852 } else {
3853 prot = PROT_READ | PROT_WRITE;
3854 flags = MAP_PRIVATE;
3855 }
3856
3857 if (allow_exec) {
3858 prot |= PROT_EXEC;
3859 }
3860
3861 if (addr != NULL) {
3862 flags |= MAP_FIXED;
3863 }
3864
3865 // Allow anonymous mappings if 'fd' is -1.
3866 if (fd == -1) {
3867 flags |= MAP_ANONYMOUS;
3868 }
3869
3870 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3871 fd, file_offset);
3872 if (mapped_address == MAP_FAILED) {
3873 return NULL;
3874 }
3875 return mapped_address;
3876 }
3877
3878 // Remap a block of memory.
3879 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3880 char *addr, size_t bytes, bool read_only,
3881 bool allow_exec) {
3882 // same as map_memory() on this OS
3883 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3884 allow_exec);
3885 }
3886
3887 // Unmap a block of memory.
3888 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3889 return munmap(addr, bytes) == 0;
3890 }
3891
3892 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3893 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3894 // of a thread.
3895 //
3896 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3897 // the fast estimate available on the platform.
3898
3899 jlong os::current_thread_cpu_time() {
3900 // return user + sys since the cost is the same
3901 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3902 assert(n >= 0, "negative CPU time");
3903 return n;
3904 }
3905
3906 jlong os::thread_cpu_time(Thread* thread) {
3907 // consistent with what current_thread_cpu_time() returns
3908 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3909 assert(n >= 0, "negative CPU time");
3910 return n;
3911 }
3912
3913 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3914 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3915 assert(n >= 0, "negative CPU time");
3916 return n;
3917 }
3918
3919 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3920 bool error = false;
3921
3922 jlong sys_time = 0;
3923 jlong user_time = 0;
3924
3925 // Reimplemented using getthrds64().
3926 //
3927 // Works like this:
3928 // For the thread in question, get the kernel thread id. Then get the
3929 // kernel thread statistics using that id.
3930 //
3931 // This only works of course when no pthread scheduling is used,
3932 // i.e. there is a 1:1 relationship to kernel threads.
3933 // On AIX, see AIXTHREAD_SCOPE variable.
3934
3935 pthread_t pthtid = thread->osthread()->pthread_id();
3936
3937 // retrieve kernel thread id for the pthread:
3938 tid64_t tid = 0;
3939 struct __pthrdsinfo pinfo;
3940 // I just love those otherworldly IBM APIs which force me to hand down
3941 // dummy buffers for stuff I dont care for...
3942 char dummy[1];
3943 int dummy_size = sizeof(dummy);
3944 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3945 dummy, &dummy_size) == 0) {
3946 tid = pinfo.__pi_tid;
3947 } else {
3948 tty->print_cr("pthread_getthrds_np failed.");
3949 error = true;
3950 }
3951
3952 // retrieve kernel timing info for that kernel thread
3953 if (!error) {
3954 struct thrdentry64 thrdentry;
3955 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3956 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3957 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3958 } else {
3959 tty->print_cr("pthread_getthrds_np failed.");
3960 error = true;
3961 }
3962 }
3963
3964 if (p_sys_time) {
3965 *p_sys_time = sys_time;
3966 }
3967
3968 if (p_user_time) {
3969 *p_user_time = user_time;
3970 }
3971
3972 if (error) {
3973 return false;
3974 }
3975
3976 return true;
3977 }
3978
3979 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3980 jlong sys_time;
3981 jlong user_time;
3982
3983 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3984 return -1;
3985 }
3986
3987 return user_sys_cpu_time ? sys_time + user_time : user_time;
3988 }
3989
3990 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3991 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3992 info_ptr->may_skip_backward = false; // elapsed time not wall time
3993 info_ptr->may_skip_forward = false; // elapsed time not wall time
3994 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3995 }
3996
3997 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3998 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3999 info_ptr->may_skip_backward = false; // elapsed time not wall time
4000 info_ptr->may_skip_forward = false; // elapsed time not wall time
4001 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4002 }
4003
4004 bool os::is_thread_cpu_time_supported() {
4005 return true;
4006 }
4007
4008 // System loadavg support. Returns -1 if load average cannot be obtained.
4009 // For now just return the system wide load average (no processor sets).
4010 int os::loadavg(double values[], int nelem) {
4011
4012 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4013 guarantee(values, "argument error");
4014
4015 if (os::Aix::on_pase()) {
4016
4017 // AS/400 PASE: use libo4 porting library
4018 double v[3] = { 0.0, 0.0, 0.0 };
4019
4020 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4021 for (int i = 0; i < nelem; i ++) {
4022 values[i] = v[i];
4023 }
4024 return nelem;
4025 } else {
4026 return -1;
4027 }
4028
4029 } else {
4030
4031 // AIX: use libperfstat
4032 libperfstat::cpuinfo_t ci;
4033 if (libperfstat::get_cpuinfo(&ci)) {
4034 for (int i = 0; i < nelem; i++) {
4035 values[i] = ci.loadavg[i];
4036 }
4037 } else {
4038 return -1;
4039 }
4040 return nelem;
4041 }
4042 }
4043
4044 void os::pause() {
4045 char filename[MAX_PATH];
4046 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4047 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4048 } else {
4049 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4050 }
4051
4052 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4053 if (fd != -1) {
4054 struct stat buf;
4055 ::close(fd);
4056 while (::stat(filename, &buf) == 0) {
4057 (void)::poll(NULL, 0, 100);
4058 }
4059 } else {
4060 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4061 }
4062 }
4063
4064 bool os::is_primordial_thread(void) {
4065 if (pthread_self() == (pthread_t)1) {
4066 return true;
4067 } else {
4068 return false;
4069 }
4070 }
4071
4072 // OS recognitions (PASE/AIX, OS level) call this before calling any
4073 // one of Aix::on_pase(), Aix::os_version() static
4074 void os::Aix::initialize_os_info() {
4075
4076 assert(_on_pase == -1 && _os_version == 0, "already called.");
4077
4078 struct utsname uts;
4079 memset(&uts, 0, sizeof(uts));
4080 strcpy(uts.sysname, "?");
4081 if (::uname(&uts) == -1) {
4082 trcVerbose("uname failed (%d)", errno);
4083 guarantee(0, "Could not determine whether we run on AIX or PASE");
4084 } else {
4085 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4086 "node \"%s\" machine \"%s\"\n",
4087 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4088 const int major = atoi(uts.version);
4089 assert(major > 0, "invalid OS version");
4090 const int minor = atoi(uts.release);
4091 assert(minor > 0, "invalid OS release");
4092 _os_version = (major << 24) | (minor << 16);
4093 char ver_str[20] = {0};
4094 char *name_str = "unknown OS";
4095 if (strcmp(uts.sysname, "OS400") == 0) {
4096 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4097 _on_pase = 1;
4098 if (os_version_short() < 0x0504) {
4099 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4100 assert(false, "OS/400 release too old.");
4101 }
4102 name_str = "OS/400 (pase)";
4103 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4104 } else if (strcmp(uts.sysname, "AIX") == 0) {
4105 // We run on AIX. We do not support versions older than AIX 5.3.
4106 _on_pase = 0;
4107 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4108 odmWrapper::determine_os_kernel_version(&_os_version);
4109 if (os_version_short() < 0x0503) {
4110 trcVerbose("AIX release older than AIX 5.3 not supported.");
4111 assert(false, "AIX release too old.");
4112 }
4113 name_str = "AIX";
4114 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4115 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4116 } else {
4117 assert(false, name_str);
4118 }
4119 trcVerbose("We run on %s %s", name_str, ver_str);
4120 }
4121
4122 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4123 } // end: os::Aix::initialize_os_info()
4124
4125 // Scan environment for important settings which might effect the VM.
4126 // Trace out settings. Warn about invalid settings and/or correct them.
4127 //
4128 // Must run after os::Aix::initialue_os_info().
4129 void os::Aix::scan_environment() {
4130
4131 char* p;
4132 int rc;
4133
4134 // Warn explicity if EXTSHM=ON is used. That switch changes how
4135 // System V shared memory behaves. One effect is that page size of
4136 // shared memory cannot be change dynamically, effectivly preventing
4137 // large pages from working.
4138 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4139 // recommendation is (in OSS notes) to switch it off.
4140 p = ::getenv("EXTSHM");
4141 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4142 if (p && strcasecmp(p, "ON") == 0) {
4143 _extshm = 1;
4144 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4145 if (!AllowExtshm) {
4146 // We allow under certain conditions the user to continue. However, we want this
4147 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4148 // that the VM is not able to allocate 64k pages for the heap.
4149 // We do not want to run with reduced performance.
4150 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4151 }
4152 } else {
4153 _extshm = 0;
4154 }
4155
4156 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4157 // Not tested, not supported.
4158 //
4159 // Note that it might be worth the trouble to test and to require it, if only to
4160 // get useful return codes for mprotect.
4161 //
4162 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4163 // exec() ? before loading the libjvm ? ....)
4164 p = ::getenv("XPG_SUS_ENV");
4165 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4166 if (p && strcmp(p, "ON") == 0) {
4167 _xpg_sus_mode = 1;
4168 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4169 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4170 // clobber address ranges. If we ever want to support that, we have to do some
4171 // testing first.
4172 guarantee(false, "XPG_SUS_ENV=ON not supported");
4173 } else {
4174 _xpg_sus_mode = 0;
4175 }
4176
4177 if (os::Aix::on_pase()) {
4178 p = ::getenv("QIBM_MULTI_THREADED");
4179 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4180 }
4181
4182 p = ::getenv("LDR_CNTRL");
4183 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4184 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4185 if (p && ::strstr(p, "TEXTPSIZE")) {
4186 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4187 "you may experience hangs or crashes on OS/400 V7R1.");
4188 }
4189 }
4190
4191 p = ::getenv("AIXTHREAD_GUARDPAGES");
4192 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4193
4194 } // end: os::Aix::scan_environment()
4195
4196 // PASE: initialize the libo4 library (PASE porting library).
4197 void os::Aix::initialize_libo4() {
4198 guarantee(os::Aix::on_pase(), "OS/400 only.");
4199 if (!libo4::init()) {
4200 trcVerbose("libo4 initialization failed.");
4201 assert(false, "libo4 initialization failed");
4202 } else {
4203 trcVerbose("libo4 initialized.");
4204 }
4205 }
4206
4207 // AIX: initialize the libperfstat library.
4208 void os::Aix::initialize_libperfstat() {
4209 assert(os::Aix::on_aix(), "AIX only");
4210 if (!libperfstat::init()) {
4211 trcVerbose("libperfstat initialization failed.");
4212 assert(false, "libperfstat initialization failed");
4213 } else {
4214 trcVerbose("libperfstat initialized.");
4215 }
4216 }
4217
4218 /////////////////////////////////////////////////////////////////////////////
4219 // thread stack
4220
4221 // Get the current stack base from the OS (actually, the pthread library).
4222 // Note: usually not page aligned.
4223 address os::current_stack_base() {
4224 AixMisc::stackbounds_t bounds;
4225 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4226 guarantee(rc, "Unable to retrieve stack bounds.");
4227 return bounds.base;
4228 }
4229
4230 // Get the current stack size from the OS (actually, the pthread library).
4231 // Returned size is such that (base - size) is always aligned to page size.
4232 size_t os::current_stack_size() {
4233 AixMisc::stackbounds_t bounds;
4234 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4235 guarantee(rc, "Unable to retrieve stack bounds.");
4236 // Align the returned stack size such that the stack low address
4237 // is aligned to page size (Note: base is usually not and we do not care).
4238 // We need to do this because caller code will assume stack low address is
4239 // page aligned and will place guard pages without checking.
4240 address low = bounds.base - bounds.size;
4241 address low_aligned = (address)align_up(low, os::vm_page_size());
4242 size_t s = bounds.base - low_aligned;
4243 return s;
4244 }
4245
4246 extern char** environ;
4247
4248 // Run the specified command in a separate process. Return its exit value,
4249 // or -1 on failure (e.g. can't fork a new process).
4250 // Unlike system(), this function can be called from signal handler. It
4251 // doesn't block SIGINT et al.
4252 int os::fork_and_exec(char* cmd) {
4253 char * argv[4] = {"sh", "-c", cmd, NULL};
4254
4255 pid_t pid = fork();
4256
4257 if (pid < 0) {
4258 // fork failed
4259 return -1;
4260
4261 } else if (pid == 0) {
4262 // child process
4263
4264 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4265 execve("/usr/bin/sh", argv, environ);
4266
4267 // execve failed
4268 _exit(-1);
4269
4270 } else {
4271 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4272 // care about the actual exit code, for now.
4273
4274 int status;
4275
4276 // Wait for the child process to exit. This returns immediately if
4277 // the child has already exited. */
4278 while (waitpid(pid, &status, 0) < 0) {
4279 switch (errno) {
4280 case ECHILD: return 0;
4281 case EINTR: break;
4282 default: return -1;
4283 }
4284 }
4285
4286 if (WIFEXITED(status)) {
4287 // The child exited normally; get its exit code.
4288 return WEXITSTATUS(status);
4289 } else if (WIFSIGNALED(status)) {
4290 // The child exited because of a signal.
4291 // The best value to return is 0x80 + signal number,
4292 // because that is what all Unix shells do, and because
4293 // it allows callers to distinguish between process exit and
4294 // process death by signal.
4295 return 0x80 + WTERMSIG(status);
4296 } else {
4297 // Unknown exit code; pass it through.
4298 return status;
4299 }
4300 }
4301 return -1;
4302 }
4303
4304 // Get the default path to the core file
4305 // Returns the length of the string
4306 int os::get_core_path(char* buffer, size_t bufferSize) {
4307 const char* p = get_current_directory(buffer, bufferSize);
4308
4309 if (p == NULL) {
4310 assert(p != NULL, "failed to get current directory");
4311 return 0;
4312 }
4313
4314 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4315 p, current_process_id());
4316
4317 return strlen(buffer);
4318 }
4319
4320 #ifndef PRODUCT
4321 void TestReserveMemorySpecial_test() {
4322 // No tests available for this platform
4323 }
4324 #endif
4325
4326 bool os::start_debugging(char *buf, int buflen) {
4327 int len = (int)strlen(buf);
4328 char *p = &buf[len];
4329
4330 jio_snprintf(p, buflen -len,
4331 "\n\n"
4332 "Do you want to debug the problem?\n\n"
4333 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4334 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4335 "Otherwise, press RETURN to abort...",
4336 os::current_process_id(),
4337 os::current_thread_id(), thread_self());
4338
4339 bool yes = os::message_box("Unexpected Error", buf);
4340
4341 if (yes) {
4342 // yes, user asked VM to launch debugger
4343 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4344
4345 os::fork_and_exec(buf);
4346 yes = false;
4347 }
4348 return yes;
4349 }
4350
4351 static inline time_t get_mtime(const char* filename) {
4352 struct stat st;
4353 int ret = os::stat(filename, &st);
4354 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4355 return st.st_mtime;
4356 }
4357
4358 int os::compare_file_modified_times(const char* file1, const char* file2) {
4359 time_t t1 = get_mtime(file1);
4360 time_t t2 = get_mtime(file2);
4361 return t1 - t2;
4362 }