1 /*
2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2017 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 static address resolve_function_descriptor_to_code_pointer(address p);
134
135 static void vmembk_print_on(outputStream* os);
136
137 ////////////////////////////////////////////////////////////////////////////////
138 // global variables (for a description see os_aix.hpp)
139
140 julong os::Aix::_physical_memory = 0;
141
142 pthread_t os::Aix::_main_thread = ((pthread_t)0);
143 int os::Aix::_page_size = -1;
144
145 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
146 int os::Aix::_on_pase = -1;
147
148 // 0 = uninitialized, otherwise 32 bit number:
149 // 0xVVRRTTSS
150 // VV - major version
151 // RR - minor version
152 // TT - tech level, if known, 0 otherwise
153 // SS - service pack, if known, 0 otherwise
154 uint32_t os::Aix::_os_version = 0;
155
156 // -1 = uninitialized, 0 - no, 1 - yes
157 int os::Aix::_xpg_sus_mode = -1;
158
159 // -1 = uninitialized, 0 - no, 1 - yes
160 int os::Aix::_extshm = -1;
161
162 ////////////////////////////////////////////////////////////////////////////////
163 // local variables
164
165 static jlong initial_time_count = 0;
166 static int clock_tics_per_sec = 100;
167 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
168 static bool check_signals = true;
169 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
170 static sigset_t SR_sigset;
171
172 // Process break recorded at startup.
173 static address g_brk_at_startup = NULL;
174
175 // This describes the state of multipage support of the underlying
176 // OS. Note that this is of no interest to the outsize world and
177 // therefore should not be defined in AIX class.
178 //
179 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
180 // latter two (16M "large" resp. 16G "huge" pages) require special
181 // setup and are normally not available.
182 //
183 // AIX supports multiple page sizes per process, for:
184 // - Stack (of the primordial thread, so not relevant for us)
185 // - Data - data, bss, heap, for us also pthread stacks
186 // - Text - text code
187 // - shared memory
188 //
189 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
190 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
191 //
192 // For shared memory, page size can be set dynamically via
193 // shmctl(). Different shared memory regions can have different page
194 // sizes.
195 //
196 // More information can be found at AIBM info center:
197 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
198 //
199 static struct {
200 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
201 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
202 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
203 size_t pthr_stack_pagesize; // stack page size of pthread threads
204 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
205 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
206 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
207 int error; // Error describing if something went wrong at multipage init.
208 } g_multipage_support = {
209 (size_t) -1,
210 (size_t) -1,
211 (size_t) -1,
212 (size_t) -1,
213 (size_t) -1,
214 false, false,
215 0
216 };
217
218 // We must not accidentally allocate memory close to the BRK - even if
219 // that would work - because then we prevent the BRK segment from
220 // growing which may result in a malloc OOM even though there is
221 // enough memory. The problem only arises if we shmat() or mmap() at
222 // a specific wish address, e.g. to place the heap in a
223 // compressed-oops-friendly way.
224 static bool is_close_to_brk(address a) {
225 assert0(g_brk_at_startup != NULL);
226 if (a >= g_brk_at_startup &&
227 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
228 return true;
229 }
230 return false;
231 }
232
233 julong os::available_memory() {
234 return Aix::available_memory();
235 }
236
237 julong os::Aix::available_memory() {
238 // Avoid expensive API call here, as returned value will always be null.
239 if (os::Aix::on_pase()) {
240 return 0x0LL;
241 }
242 os::Aix::meminfo_t mi;
243 if (os::Aix::get_meminfo(&mi)) {
244 return mi.real_free;
245 } else {
246 return ULONG_MAX;
247 }
248 }
249
250 julong os::physical_memory() {
251 return Aix::physical_memory();
252 }
253
254 // Return true if user is running as root.
255
256 bool os::have_special_privileges() {
257 static bool init = false;
258 static bool privileges = false;
259 if (!init) {
260 privileges = (getuid() != geteuid()) || (getgid() != getegid());
261 init = true;
262 }
263 return privileges;
264 }
265
266 // Helper function, emulates disclaim64 using multiple 32bit disclaims
267 // because we cannot use disclaim64() on AS/400 and old AIX releases.
268 static bool my_disclaim64(char* addr, size_t size) {
269
270 if (size == 0) {
271 return true;
272 }
273
274 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
275 const unsigned int maxDisclaimSize = 0x40000000;
276
277 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
278 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
279
280 char* p = addr;
281
282 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
283 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
284 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
285 return false;
286 }
287 p += maxDisclaimSize;
288 }
289
290 if (lastDisclaimSize > 0) {
291 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
292 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
293 return false;
294 }
295 }
296
297 return true;
298 }
299
300 // Cpu architecture string
301 #if defined(PPC32)
302 static char cpu_arch[] = "ppc";
303 #elif defined(PPC64)
304 static char cpu_arch[] = "ppc64";
305 #else
306 #error Add appropriate cpu_arch setting
307 #endif
308
309 // Wrap the function "vmgetinfo" which is not available on older OS releases.
310 static int checked_vmgetinfo(void *out, int command, int arg) {
311 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
312 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
313 }
314 return ::vmgetinfo(out, command, arg);
315 }
316
317 // Given an address, returns the size of the page backing that address.
318 size_t os::Aix::query_pagesize(void* addr) {
319
320 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
321 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
322 return 4*K;
323 }
324
325 vm_page_info pi;
326 pi.addr = (uint64_t)addr;
327 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
328 return pi.pagesize;
329 } else {
330 assert(false, "vmgetinfo failed to retrieve page size");
331 return 4*K;
332 }
333 }
334
335 void os::Aix::initialize_system_info() {
336
337 // Get the number of online(logical) cpus instead of configured.
338 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
339 assert(_processor_count > 0, "_processor_count must be > 0");
340
341 // Retrieve total physical storage.
342 os::Aix::meminfo_t mi;
343 if (!os::Aix::get_meminfo(&mi)) {
344 assert(false, "os::Aix::get_meminfo failed.");
345 }
346 _physical_memory = (julong) mi.real_total;
347 }
348
349 // Helper function for tracing page sizes.
350 static const char* describe_pagesize(size_t pagesize) {
351 switch (pagesize) {
352 case 4*K : return "4K";
353 case 64*K: return "64K";
354 case 16*M: return "16M";
355 case 16*G: return "16G";
356 default:
357 assert(false, "surprise");
358 return "??";
359 }
360 }
361
362 // Probe OS for multipage support.
363 // Will fill the global g_multipage_support structure.
364 // Must be called before calling os::large_page_init().
365 static void query_multipage_support() {
366
367 guarantee(g_multipage_support.pagesize == -1,
368 "do not call twice");
369
370 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
371
372 // This really would surprise me.
373 assert(g_multipage_support.pagesize == 4*K, "surprise!");
374
375 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
376 // Default data page size is defined either by linker options (-bdatapsize)
377 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
378 // default should be 4K.
379 {
380 void* p = ::malloc(16*M);
381 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
382 ::free(p);
383 }
384
385 // Query default shm page size (LDR_CNTRL SHMPSIZE).
386 // Note that this is pure curiosity. We do not rely on default page size but set
387 // our own page size after allocated.
388 {
389 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
390 guarantee(shmid != -1, "shmget failed");
391 void* p = ::shmat(shmid, NULL, 0);
392 ::shmctl(shmid, IPC_RMID, NULL);
393 guarantee(p != (void*) -1, "shmat failed");
394 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
395 ::shmdt(p);
396 }
397
398 // Before querying the stack page size, make sure we are not running as primordial
399 // thread (because primordial thread's stack may have different page size than
400 // pthread thread stacks). Running a VM on the primordial thread won't work for a
401 // number of reasons so we may just as well guarantee it here.
402 guarantee0(!os::is_primordial_thread());
403
404 // Query pthread stack page size. Should be the same as data page size because
405 // pthread stacks are allocated from C-Heap.
406 {
407 int dummy = 0;
408 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
409 }
410
411 // Query default text page size (LDR_CNTRL TEXTPSIZE).
412 {
413 address any_function =
414 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
415 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
416 }
417
418 // Now probe for support of 64K pages and 16M pages.
419
420 // Before OS/400 V6R1, there is no support for pages other than 4K.
421 if (os::Aix::on_pase_V5R4_or_older()) {
422 trcVerbose("OS/400 < V6R1 - no large page support.");
423 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
424 goto query_multipage_support_end;
425 }
426
427 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
428 {
429 const int MAX_PAGE_SIZES = 4;
430 psize_t sizes[MAX_PAGE_SIZES];
431 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
432 if (num_psizes == -1) {
433 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
434 trcVerbose("disabling multipage support.");
435 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
436 goto query_multipage_support_end;
437 }
438 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
439 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
440 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
441 for (int i = 0; i < num_psizes; i ++) {
442 trcVerbose(" %s ", describe_pagesize(sizes[i]));
443 }
444
445 // Can we use 64K, 16M pages?
446 for (int i = 0; i < num_psizes; i ++) {
447 const size_t pagesize = sizes[i];
448 if (pagesize != 64*K && pagesize != 16*M) {
449 continue;
450 }
451 bool can_use = false;
452 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
453 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
454 IPC_CREAT | S_IRUSR | S_IWUSR);
455 guarantee0(shmid != -1); // Should always work.
456 // Try to set pagesize.
457 struct shmid_ds shm_buf = { 0 };
458 shm_buf.shm_pagesize = pagesize;
459 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
460 const int en = errno;
461 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
462 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
463 errno);
464 } else {
465 // Attach and double check pageisze.
466 void* p = ::shmat(shmid, NULL, 0);
467 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
468 guarantee0(p != (void*) -1); // Should always work.
469 const size_t real_pagesize = os::Aix::query_pagesize(p);
470 if (real_pagesize != pagesize) {
471 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
472 } else {
473 can_use = true;
474 }
475 ::shmdt(p);
476 }
477 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
478 if (pagesize == 64*K) {
479 g_multipage_support.can_use_64K_pages = can_use;
480 } else if (pagesize == 16*M) {
481 g_multipage_support.can_use_16M_pages = can_use;
482 }
483 }
484
485 } // end: check which pages can be used for shared memory
486
487 query_multipage_support_end:
488
489 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
490 describe_pagesize(g_multipage_support.pagesize));
491 trcVerbose("Data page size (C-Heap, bss, etc): %s",
492 describe_pagesize(g_multipage_support.datapsize));
493 trcVerbose("Text page size: %s",
494 describe_pagesize(g_multipage_support.textpsize));
495 trcVerbose("Thread stack page size (pthread): %s",
496 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
497 trcVerbose("Default shared memory page size: %s",
498 describe_pagesize(g_multipage_support.shmpsize));
499 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
500 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
501 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
502 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
503 trcVerbose("Multipage error details: %d",
504 g_multipage_support.error);
505
506 // sanity checks
507 assert0(g_multipage_support.pagesize == 4*K);
508 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
509 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
510 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
511 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
512
513 }
514
515 void os::init_system_properties_values() {
516
517 #define DEFAULT_LIBPATH "/lib:/usr/lib"
518 #define EXTENSIONS_DIR "/lib/ext"
519
520 // Buffer that fits several sprintfs.
521 // Note that the space for the trailing null is provided
522 // by the nulls included by the sizeof operator.
523 const size_t bufsize =
524 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
525 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
526 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
527
528 // sysclasspath, java_home, dll_dir
529 {
530 char *pslash;
531 os::jvm_path(buf, bufsize);
532
533 // Found the full path to libjvm.so.
534 // Now cut the path to <java_home>/jre if we can.
535 pslash = strrchr(buf, '/');
536 if (pslash != NULL) {
537 *pslash = '\0'; // Get rid of /libjvm.so.
538 }
539 pslash = strrchr(buf, '/');
540 if (pslash != NULL) {
541 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
542 }
543 Arguments::set_dll_dir(buf);
544
545 if (pslash != NULL) {
546 pslash = strrchr(buf, '/');
547 if (pslash != NULL) {
548 *pslash = '\0'; // Get rid of /lib.
549 }
550 }
551 Arguments::set_java_home(buf);
552 set_boot_path('/', ':');
553 }
554
555 // Where to look for native libraries.
556
557 // On Aix we get the user setting of LIBPATH.
558 // Eventually, all the library path setting will be done here.
559 // Get the user setting of LIBPATH.
560 const char *v = ::getenv("LIBPATH");
561 const char *v_colon = ":";
562 if (v == NULL) { v = ""; v_colon = ""; }
563
564 // Concatenate user and invariant part of ld_library_path.
565 // That's +1 for the colon and +1 for the trailing '\0'.
566 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
567 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
568 Arguments::set_library_path(ld_library_path);
569 FREE_C_HEAP_ARRAY(char, ld_library_path);
570
571 // Extensions directories.
572 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
573 Arguments::set_ext_dirs(buf);
574
575 FREE_C_HEAP_ARRAY(char, buf);
576
577 #undef DEFAULT_LIBPATH
578 #undef EXTENSIONS_DIR
579 }
580
581 ////////////////////////////////////////////////////////////////////////////////
582 // breakpoint support
583
584 void os::breakpoint() {
585 BREAKPOINT;
586 }
587
588 extern "C" void breakpoint() {
589 // use debugger to set breakpoint here
590 }
591
592 ////////////////////////////////////////////////////////////////////////////////
593 // signal support
594
595 debug_only(static bool signal_sets_initialized = false);
596 static sigset_t unblocked_sigs, vm_sigs;
597
598 bool os::Aix::is_sig_ignored(int sig) {
599 struct sigaction oact;
600 sigaction(sig, (struct sigaction*)NULL, &oact);
601 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
602 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
603 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
604 return true;
605 } else {
606 return false;
607 }
608 }
609
610 void os::Aix::signal_sets_init() {
611 // Should also have an assertion stating we are still single-threaded.
612 assert(!signal_sets_initialized, "Already initialized");
613 // Fill in signals that are necessarily unblocked for all threads in
614 // the VM. Currently, we unblock the following signals:
615 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
616 // by -Xrs (=ReduceSignalUsage));
617 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
618 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
619 // the dispositions or masks wrt these signals.
620 // Programs embedding the VM that want to use the above signals for their
621 // own purposes must, at this time, use the "-Xrs" option to prevent
622 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
623 // (See bug 4345157, and other related bugs).
624 // In reality, though, unblocking these signals is really a nop, since
625 // these signals are not blocked by default.
626 sigemptyset(&unblocked_sigs);
627 sigaddset(&unblocked_sigs, SIGILL);
628 sigaddset(&unblocked_sigs, SIGSEGV);
629 sigaddset(&unblocked_sigs, SIGBUS);
630 sigaddset(&unblocked_sigs, SIGFPE);
631 sigaddset(&unblocked_sigs, SIGTRAP);
632 sigaddset(&unblocked_sigs, SR_signum);
633
634 if (!ReduceSignalUsage) {
635 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
636 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
637 }
638 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
639 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
640 }
641 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
642 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
643 }
644 }
645 // Fill in signals that are blocked by all but the VM thread.
646 sigemptyset(&vm_sigs);
647 if (!ReduceSignalUsage)
648 sigaddset(&vm_sigs, BREAK_SIGNAL);
649 debug_only(signal_sets_initialized = true);
650 }
651
652 // These are signals that are unblocked while a thread is running Java.
653 // (For some reason, they get blocked by default.)
654 sigset_t* os::Aix::unblocked_signals() {
655 assert(signal_sets_initialized, "Not initialized");
656 return &unblocked_sigs;
657 }
658
659 // These are the signals that are blocked while a (non-VM) thread is
660 // running Java. Only the VM thread handles these signals.
661 sigset_t* os::Aix::vm_signals() {
662 assert(signal_sets_initialized, "Not initialized");
663 return &vm_sigs;
664 }
665
666 void os::Aix::hotspot_sigmask(Thread* thread) {
667
668 //Save caller's signal mask before setting VM signal mask
669 sigset_t caller_sigmask;
670 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
671
672 OSThread* osthread = thread->osthread();
673 osthread->set_caller_sigmask(caller_sigmask);
674
675 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
676
677 if (!ReduceSignalUsage) {
678 if (thread->is_VM_thread()) {
679 // Only the VM thread handles BREAK_SIGNAL ...
680 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
681 } else {
682 // ... all other threads block BREAK_SIGNAL
683 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
684 }
685 }
686 }
687
688 // retrieve memory information.
689 // Returns false if something went wrong;
690 // content of pmi undefined in this case.
691 bool os::Aix::get_meminfo(meminfo_t* pmi) {
692
693 assert(pmi, "get_meminfo: invalid parameter");
694
695 memset(pmi, 0, sizeof(meminfo_t));
696
697 if (os::Aix::on_pase()) {
698 // On PASE, use the libo4 porting library.
699
700 unsigned long long virt_total = 0;
701 unsigned long long real_total = 0;
702 unsigned long long real_free = 0;
703 unsigned long long pgsp_total = 0;
704 unsigned long long pgsp_free = 0;
705 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
706 pmi->virt_total = virt_total;
707 pmi->real_total = real_total;
708 pmi->real_free = real_free;
709 pmi->pgsp_total = pgsp_total;
710 pmi->pgsp_free = pgsp_free;
711 return true;
712 }
713 return false;
714
715 } else {
716
717 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
718 // See:
719 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
720 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
721 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
722 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
723
724 perfstat_memory_total_t psmt;
725 memset (&psmt, '\0', sizeof(psmt));
726 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
727 if (rc == -1) {
728 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
729 assert(0, "perfstat_memory_total() failed");
730 return false;
731 }
732
733 assert(rc == 1, "perfstat_memory_total() - weird return code");
734
735 // excerpt from
736 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
737 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
738 // The fields of perfstat_memory_total_t:
739 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
740 // u_longlong_t real_total Total real memory (in 4 KB pages).
741 // u_longlong_t real_free Free real memory (in 4 KB pages).
742 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
743 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
744
745 pmi->virt_total = psmt.virt_total * 4096;
746 pmi->real_total = psmt.real_total * 4096;
747 pmi->real_free = psmt.real_free * 4096;
748 pmi->pgsp_total = psmt.pgsp_total * 4096;
749 pmi->pgsp_free = psmt.pgsp_free * 4096;
750
751 return true;
752
753 }
754 } // end os::Aix::get_meminfo
755
756 //////////////////////////////////////////////////////////////////////////////
757 // create new thread
758
759 // Thread start routine for all newly created threads
760 static void *thread_native_entry(Thread *thread) {
761
762 // find out my own stack dimensions
763 {
764 // actually, this should do exactly the same as thread->record_stack_base_and_size...
765 thread->set_stack_base(os::current_stack_base());
766 thread->set_stack_size(os::current_stack_size());
767 }
768
769 const pthread_t pthread_id = ::pthread_self();
770 const tid_t kernel_thread_id = ::thread_self();
771
772 LogTarget(Info, os, thread) lt;
773 if (lt.is_enabled()) {
774 address low_address = thread->stack_end();
775 address high_address = thread->stack_base();
776 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
777 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
778 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
779 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
780 }
781
782 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
783 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
784 // tools hook pthread_create(). In this case, we may run into problems establishing
785 // guard pages on those stacks, because the stacks may reside in memory which is not
786 // protectable (shmated).
787 if (thread->stack_base() > ::sbrk(0)) {
788 log_warning(os, thread)("Thread stack not in data segment.");
789 }
790
791 // Try to randomize the cache line index of hot stack frames.
792 // This helps when threads of the same stack traces evict each other's
793 // cache lines. The threads can be either from the same JVM instance, or
794 // from different JVM instances. The benefit is especially true for
795 // processors with hyperthreading technology.
796
797 static int counter = 0;
798 int pid = os::current_process_id();
799 alloca(((pid ^ counter++) & 7) * 128);
800
801 thread->initialize_thread_current();
802
803 OSThread* osthread = thread->osthread();
804
805 // Thread_id is pthread id.
806 osthread->set_thread_id(pthread_id);
807
808 // .. but keep kernel thread id too for diagnostics
809 osthread->set_kernel_thread_id(kernel_thread_id);
810
811 // Initialize signal mask for this thread.
812 os::Aix::hotspot_sigmask(thread);
813
814 // Initialize floating point control register.
815 os::Aix::init_thread_fpu_state();
816
817 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
818
819 // Call one more level start routine.
820 thread->run();
821
822 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
823 os::current_thread_id(), (uintx) kernel_thread_id);
824
825 // If a thread has not deleted itself ("delete this") as part of its
826 // termination sequence, we have to ensure thread-local-storage is
827 // cleared before we actually terminate. No threads should ever be
828 // deleted asynchronously with respect to their termination.
829 if (Thread::current_or_null_safe() != NULL) {
830 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
831 thread->clear_thread_current();
832 }
833
834 return 0;
835 }
836
837 bool os::create_thread(Thread* thread, ThreadType thr_type,
838 size_t req_stack_size) {
839
840 assert(thread->osthread() == NULL, "caller responsible");
841
842 // Allocate the OSThread object.
843 OSThread* osthread = new OSThread(NULL, NULL);
844 if (osthread == NULL) {
845 return false;
846 }
847
848 // Set the correct thread state.
849 osthread->set_thread_type(thr_type);
850
851 // Initial state is ALLOCATED but not INITIALIZED
852 osthread->set_state(ALLOCATED);
853
854 thread->set_osthread(osthread);
855
856 // Init thread attributes.
857 pthread_attr_t attr;
858 pthread_attr_init(&attr);
859 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
860
861 // Make sure we run in 1:1 kernel-user-thread mode.
862 if (os::Aix::on_aix()) {
863 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
864 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
865 }
866
867 // Start in suspended state, and in os::thread_start, wake the thread up.
868 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
869
870 // Calculate stack size if it's not specified by caller.
871 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
872
873 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
874 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
875 // This very much looks like a pthread lib error. As a workaround, increase the stack size
876 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
877 if (stack_size < 4096 * K) {
878 stack_size += 64 * K;
879 }
880
881 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
882 // thread size in attr unchanged. If this is the minimal stack size as set
883 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
884 // guard pages might not fit on the tiny stack created.
885 int ret = pthread_attr_setstacksize(&attr, stack_size);
886 if (ret != 0) {
887 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
888 stack_size / K);
889 }
890
891 // Save some cycles and a page by disabling OS guard pages where we have our own
892 // VM guard pages (in java threads). For other threads, keep system default guard
893 // pages in place.
894 if (thr_type == java_thread || thr_type == compiler_thread) {
895 ret = pthread_attr_setguardsize(&attr, 0);
896 }
897
898 pthread_t tid = 0;
899 if (ret == 0) {
900 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
901 }
902
903 if (ret == 0) {
904 char buf[64];
905 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
906 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
907 } else {
908 char buf[64];
909 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
910 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
911 }
912
913 pthread_attr_destroy(&attr);
914
915 if (ret != 0) {
916 // Need to clean up stuff we've allocated so far.
917 thread->set_osthread(NULL);
918 delete osthread;
919 return false;
920 }
921
922 // OSThread::thread_id is the pthread id.
923 osthread->set_thread_id(tid);
924
925 return true;
926 }
927
928 /////////////////////////////////////////////////////////////////////////////
929 // attach existing thread
930
931 // bootstrap the main thread
932 bool os::create_main_thread(JavaThread* thread) {
933 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
934 return create_attached_thread(thread);
935 }
936
937 bool os::create_attached_thread(JavaThread* thread) {
938 #ifdef ASSERT
939 thread->verify_not_published();
940 #endif
941
942 // Allocate the OSThread object
943 OSThread* osthread = new OSThread(NULL, NULL);
944
945 if (osthread == NULL) {
946 return false;
947 }
948
949 const pthread_t pthread_id = ::pthread_self();
950 const tid_t kernel_thread_id = ::thread_self();
951
952 // OSThread::thread_id is the pthread id.
953 osthread->set_thread_id(pthread_id);
954
955 // .. but keep kernel thread id too for diagnostics
956 osthread->set_kernel_thread_id(kernel_thread_id);
957
958 // initialize floating point control register
959 os::Aix::init_thread_fpu_state();
960
961 // Initial thread state is RUNNABLE
962 osthread->set_state(RUNNABLE);
963
964 thread->set_osthread(osthread);
965
966 if (UseNUMA) {
967 int lgrp_id = os::numa_get_group_id();
968 if (lgrp_id != -1) {
969 thread->set_lgrp_id(lgrp_id);
970 }
971 }
972
973 // initialize signal mask for this thread
974 // and save the caller's signal mask
975 os::Aix::hotspot_sigmask(thread);
976
977 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
978 os::current_thread_id(), (uintx) kernel_thread_id);
979
980 return true;
981 }
982
983 void os::pd_start_thread(Thread* thread) {
984 int status = pthread_continue_np(thread->osthread()->pthread_id());
985 assert(status == 0, "thr_continue failed");
986 }
987
988 // Free OS resources related to the OSThread
989 void os::free_thread(OSThread* osthread) {
990 assert(osthread != NULL, "osthread not set");
991
992 // We are told to free resources of the argument thread,
993 // but we can only really operate on the current thread.
994 assert(Thread::current()->osthread() == osthread,
995 "os::free_thread but not current thread");
996
997 // Restore caller's signal mask
998 sigset_t sigmask = osthread->caller_sigmask();
999 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1000
1001 delete osthread;
1002 }
1003
1004 ////////////////////////////////////////////////////////////////////////////////
1005 // time support
1006
1007 // Time since start-up in seconds to a fine granularity.
1008 // Used by VMSelfDestructTimer and the MemProfiler.
1009 double os::elapsedTime() {
1010 return (double)(os::elapsed_counter()) * 0.000001;
1011 }
1012
1013 jlong os::elapsed_counter() {
1014 timeval time;
1015 int status = gettimeofday(&time, NULL);
1016 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1017 }
1018
1019 jlong os::elapsed_frequency() {
1020 return (1000 * 1000);
1021 }
1022
1023 bool os::supports_vtime() { return true; }
1024 bool os::enable_vtime() { return false; }
1025 bool os::vtime_enabled() { return false; }
1026
1027 double os::elapsedVTime() {
1028 struct rusage usage;
1029 int retval = getrusage(RUSAGE_THREAD, &usage);
1030 if (retval == 0) {
1031 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1032 } else {
1033 // better than nothing, but not much
1034 return elapsedTime();
1035 }
1036 }
1037
1038 jlong os::javaTimeMillis() {
1039 timeval time;
1040 int status = gettimeofday(&time, NULL);
1041 assert(status != -1, "aix error at gettimeofday()");
1042 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1043 }
1044
1045 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1046 timeval time;
1047 int status = gettimeofday(&time, NULL);
1048 assert(status != -1, "aix error at gettimeofday()");
1049 seconds = jlong(time.tv_sec);
1050 nanos = jlong(time.tv_usec) * 1000;
1051 }
1052
1053 jlong os::javaTimeNanos() {
1054 if (os::Aix::on_pase()) {
1055
1056 timeval time;
1057 int status = gettimeofday(&time, NULL);
1058 assert(status != -1, "PASE error at gettimeofday()");
1059 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1060 return 1000 * usecs;
1061
1062 } else {
1063 // On AIX use the precision of processors real time clock
1064 // or time base registers.
1065 timebasestruct_t time;
1066 int rc;
1067
1068 // If the CPU has a time register, it will be used and
1069 // we have to convert to real time first. After convertion we have following data:
1070 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1071 // time.tb_low [nanoseconds after the last full second above]
1072 // We better use mread_real_time here instead of read_real_time
1073 // to ensure that we will get a monotonic increasing time.
1074 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1075 rc = time_base_to_time(&time, TIMEBASE_SZ);
1076 assert(rc != -1, "aix error at time_base_to_time()");
1077 }
1078 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1079 }
1080 }
1081
1082 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1083 info_ptr->max_value = ALL_64_BITS;
1084 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1085 info_ptr->may_skip_backward = false;
1086 info_ptr->may_skip_forward = false;
1087 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1088 }
1089
1090 // Return the real, user, and system times in seconds from an
1091 // arbitrary fixed point in the past.
1092 bool os::getTimesSecs(double* process_real_time,
1093 double* process_user_time,
1094 double* process_system_time) {
1095 struct tms ticks;
1096 clock_t real_ticks = times(&ticks);
1097
1098 if (real_ticks == (clock_t) (-1)) {
1099 return false;
1100 } else {
1101 double ticks_per_second = (double) clock_tics_per_sec;
1102 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1103 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1104 *process_real_time = ((double) real_ticks) / ticks_per_second;
1105
1106 return true;
1107 }
1108 }
1109
1110 char * os::local_time_string(char *buf, size_t buflen) {
1111 struct tm t;
1112 time_t long_time;
1113 time(&long_time);
1114 localtime_r(&long_time, &t);
1115 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1116 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1117 t.tm_hour, t.tm_min, t.tm_sec);
1118 return buf;
1119 }
1120
1121 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1122 return localtime_r(clock, res);
1123 }
1124
1125 ////////////////////////////////////////////////////////////////////////////////
1126 // runtime exit support
1127
1128 // Note: os::shutdown() might be called very early during initialization, or
1129 // called from signal handler. Before adding something to os::shutdown(), make
1130 // sure it is async-safe and can handle partially initialized VM.
1131 void os::shutdown() {
1132
1133 // allow PerfMemory to attempt cleanup of any persistent resources
1134 perfMemory_exit();
1135
1136 // needs to remove object in file system
1137 AttachListener::abort();
1138
1139 // flush buffered output, finish log files
1140 ostream_abort();
1141
1142 // Check for abort hook
1143 abort_hook_t abort_hook = Arguments::abort_hook();
1144 if (abort_hook != NULL) {
1145 abort_hook();
1146 }
1147 }
1148
1149 // Note: os::abort() might be called very early during initialization, or
1150 // called from signal handler. Before adding something to os::abort(), make
1151 // sure it is async-safe and can handle partially initialized VM.
1152 void os::abort(bool dump_core, void* siginfo, const void* context) {
1153 os::shutdown();
1154 if (dump_core) {
1155 #ifndef PRODUCT
1156 fdStream out(defaultStream::output_fd());
1157 out.print_raw("Current thread is ");
1158 char buf[16];
1159 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1160 out.print_raw_cr(buf);
1161 out.print_raw_cr("Dumping core ...");
1162 #endif
1163 ::abort(); // dump core
1164 }
1165
1166 ::exit(1);
1167 }
1168
1169 // Die immediately, no exit hook, no abort hook, no cleanup.
1170 void os::die() {
1171 ::abort();
1172 }
1173
1174 // This method is a copy of JDK's sysGetLastErrorString
1175 // from src/solaris/hpi/src/system_md.c
1176
1177 size_t os::lasterror(char *buf, size_t len) {
1178 if (errno == 0) return 0;
1179
1180 const char *s = os::strerror(errno);
1181 size_t n = ::strlen(s);
1182 if (n >= len) {
1183 n = len - 1;
1184 }
1185 ::strncpy(buf, s, n);
1186 buf[n] = '\0';
1187 return n;
1188 }
1189
1190 intx os::current_thread_id() {
1191 return (intx)pthread_self();
1192 }
1193
1194 int os::current_process_id() {
1195 return getpid();
1196 }
1197
1198 // DLL functions
1199
1200 const char* os::dll_file_extension() { return ".so"; }
1201
1202 // This must be hard coded because it's the system's temporary
1203 // directory not the java application's temp directory, ala java.io.tmpdir.
1204 const char* os::get_temp_directory() { return "/tmp"; }
1205
1206 // Check if addr is inside libjvm.so.
1207 bool os::address_is_in_vm(address addr) {
1208
1209 // Input could be a real pc or a function pointer literal. The latter
1210 // would be a function descriptor residing in the data segment of a module.
1211 loaded_module_t lm;
1212 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1213 return lm.is_in_vm;
1214 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1215 return lm.is_in_vm;
1216 } else {
1217 return false;
1218 }
1219
1220 }
1221
1222 // Resolve an AIX function descriptor literal to a code pointer.
1223 // If the input is a valid code pointer to a text segment of a loaded module,
1224 // it is returned unchanged.
1225 // If the input is a valid AIX function descriptor, it is resolved to the
1226 // code entry point.
1227 // If the input is neither a valid function descriptor nor a valid code pointer,
1228 // NULL is returned.
1229 static address resolve_function_descriptor_to_code_pointer(address p) {
1230
1231 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1232 // It is a real code pointer.
1233 return p;
1234 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1235 // Pointer to data segment, potential function descriptor.
1236 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1237 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1238 // It is a function descriptor.
1239 return code_entry;
1240 }
1241 }
1242
1243 return NULL;
1244 }
1245
1246 bool os::dll_address_to_function_name(address addr, char *buf,
1247 int buflen, int *offset,
1248 bool demangle) {
1249 if (offset) {
1250 *offset = -1;
1251 }
1252 // Buf is not optional, but offset is optional.
1253 assert(buf != NULL, "sanity check");
1254 buf[0] = '\0';
1255
1256 // Resolve function ptr literals first.
1257 addr = resolve_function_descriptor_to_code_pointer(addr);
1258 if (!addr) {
1259 return false;
1260 }
1261
1262 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1263 }
1264
1265 bool os::dll_address_to_library_name(address addr, char* buf,
1266 int buflen, int* offset) {
1267 if (offset) {
1268 *offset = -1;
1269 }
1270 // Buf is not optional, but offset is optional.
1271 assert(buf != NULL, "sanity check");
1272 buf[0] = '\0';
1273
1274 // Resolve function ptr literals first.
1275 addr = resolve_function_descriptor_to_code_pointer(addr);
1276 if (!addr) {
1277 return false;
1278 }
1279
1280 return AixSymbols::get_module_name(addr, buf, buflen);
1281 }
1282
1283 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1284 // for the same architecture as Hotspot is running on.
1285 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1286
1287 if (ebuf && ebuflen > 0) {
1288 ebuf[0] = '\0';
1289 ebuf[ebuflen - 1] = '\0';
1290 }
1291
1292 if (!filename || strlen(filename) == 0) {
1293 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1294 return NULL;
1295 }
1296
1297 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1298 void * result= ::dlopen(filename, RTLD_LAZY);
1299 if (result != NULL) {
1300 // Reload dll cache. Don't do this in signal handling.
1301 LoadedLibraries::reload();
1302 return result;
1303 } else {
1304 // error analysis when dlopen fails
1305 const char* const error_report = ::dlerror();
1306 if (error_report && ebuf && ebuflen > 0) {
1307 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1308 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1309 }
1310 }
1311 return NULL;
1312 }
1313
1314 void* os::dll_lookup(void* handle, const char* name) {
1315 void* res = dlsym(handle, name);
1316 return res;
1317 }
1318
1319 void* os::get_default_process_handle() {
1320 return (void*)::dlopen(NULL, RTLD_LAZY);
1321 }
1322
1323 void os::print_dll_info(outputStream *st) {
1324 st->print_cr("Dynamic libraries:");
1325 LoadedLibraries::print(st);
1326 }
1327
1328 void os::get_summary_os_info(char* buf, size_t buflen) {
1329 // There might be something more readable than uname results for AIX.
1330 struct utsname name;
1331 uname(&name);
1332 snprintf(buf, buflen, "%s %s", name.release, name.version);
1333 }
1334
1335 void os::print_os_info(outputStream* st) {
1336 st->print("OS:");
1337
1338 st->print("uname:");
1339 struct utsname name;
1340 uname(&name);
1341 st->print(name.sysname); st->print(" ");
1342 st->print(name.nodename); st->print(" ");
1343 st->print(name.release); st->print(" ");
1344 st->print(name.version); st->print(" ");
1345 st->print(name.machine);
1346 st->cr();
1347
1348 uint32_t ver = os::Aix::os_version();
1349 st->print_cr("AIX kernel version %u.%u.%u.%u",
1350 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1351
1352 os::Posix::print_rlimit_info(st);
1353
1354 // load average
1355 st->print("load average:");
1356 double loadavg[3] = {-1.L, -1.L, -1.L};
1357 os::loadavg(loadavg, 3);
1358 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1359 st->cr();
1360
1361 // print wpar info
1362 libperfstat::wparinfo_t wi;
1363 if (libperfstat::get_wparinfo(&wi)) {
1364 st->print_cr("wpar info");
1365 st->print_cr("name: %s", wi.name);
1366 st->print_cr("id: %d", wi.wpar_id);
1367 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1368 }
1369
1370 // print partition info
1371 libperfstat::partitioninfo_t pi;
1372 if (libperfstat::get_partitioninfo(&pi)) {
1373 st->print_cr("partition info");
1374 st->print_cr(" name: %s", pi.name);
1375 }
1376
1377 }
1378
1379 void os::print_memory_info(outputStream* st) {
1380
1381 st->print_cr("Memory:");
1382
1383 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1384 describe_pagesize(g_multipage_support.pagesize));
1385 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1386 describe_pagesize(g_multipage_support.datapsize));
1387 st->print_cr(" Text page size: %s",
1388 describe_pagesize(g_multipage_support.textpsize));
1389 st->print_cr(" Thread stack page size (pthread): %s",
1390 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1391 st->print_cr(" Default shared memory page size: %s",
1392 describe_pagesize(g_multipage_support.shmpsize));
1393 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1394 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1395 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1396 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1397 st->print_cr(" Multipage error: %d",
1398 g_multipage_support.error);
1399 st->cr();
1400 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1401
1402 // print out LDR_CNTRL because it affects the default page sizes
1403 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1404 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1405
1406 // Print out EXTSHM because it is an unsupported setting.
1407 const char* const extshm = ::getenv("EXTSHM");
1408 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1409 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1410 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1411 }
1412
1413 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1414 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1415 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1416 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1417
1418 os::Aix::meminfo_t mi;
1419 if (os::Aix::get_meminfo(&mi)) {
1420 char buffer[256];
1421 if (os::Aix::on_aix()) {
1422 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1423 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1424 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1425 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1426 } else {
1427 // PASE - Numbers are result of QWCRSSTS; they mean:
1428 // real_total: Sum of all system pools
1429 // real_free: always 0
1430 // pgsp_total: we take the size of the system ASP
1431 // pgsp_free: size of system ASP times percentage of system ASP unused
1432 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1433 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1434 st->print_cr("%% system asp used : " SIZE_FORMAT,
1435 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1436 }
1437 st->print_raw(buffer);
1438 }
1439 st->cr();
1440
1441 // Print segments allocated with os::reserve_memory.
1442 st->print_cr("internal virtual memory regions used by vm:");
1443 vmembk_print_on(st);
1444 }
1445
1446 // Get a string for the cpuinfo that is a summary of the cpu type
1447 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1448 // This looks good
1449 libperfstat::cpuinfo_t ci;
1450 if (libperfstat::get_cpuinfo(&ci)) {
1451 strncpy(buf, ci.version, buflen);
1452 } else {
1453 strncpy(buf, "AIX", buflen);
1454 }
1455 }
1456
1457 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1458 // Nothing to do beyond what os::print_cpu_info() does.
1459 }
1460
1461 static void print_signal_handler(outputStream* st, int sig,
1462 char* buf, size_t buflen);
1463
1464 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1465 st->print_cr("Signal Handlers:");
1466 print_signal_handler(st, SIGSEGV, buf, buflen);
1467 print_signal_handler(st, SIGBUS , buf, buflen);
1468 print_signal_handler(st, SIGFPE , buf, buflen);
1469 print_signal_handler(st, SIGPIPE, buf, buflen);
1470 print_signal_handler(st, SIGXFSZ, buf, buflen);
1471 print_signal_handler(st, SIGILL , buf, buflen);
1472 print_signal_handler(st, SR_signum, buf, buflen);
1473 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1474 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1475 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1476 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1477 print_signal_handler(st, SIGTRAP, buf, buflen);
1478 // We also want to know if someone else adds a SIGDANGER handler because
1479 // that will interfere with OOM killling.
1480 print_signal_handler(st, SIGDANGER, buf, buflen);
1481 }
1482
1483 static char saved_jvm_path[MAXPATHLEN] = {0};
1484
1485 // Find the full path to the current module, libjvm.so.
1486 void os::jvm_path(char *buf, jint buflen) {
1487 // Error checking.
1488 if (buflen < MAXPATHLEN) {
1489 assert(false, "must use a large-enough buffer");
1490 buf[0] = '\0';
1491 return;
1492 }
1493 // Lazy resolve the path to current module.
1494 if (saved_jvm_path[0] != 0) {
1495 strcpy(buf, saved_jvm_path);
1496 return;
1497 }
1498
1499 Dl_info dlinfo;
1500 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1501 assert(ret != 0, "cannot locate libjvm");
1502 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1503 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1504
1505 if (Arguments::sun_java_launcher_is_altjvm()) {
1506 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1507 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1508 // If "/jre/lib/" appears at the right place in the string, then
1509 // assume we are installed in a JDK and we're done. Otherwise, check
1510 // for a JAVA_HOME environment variable and fix up the path so it
1511 // looks like libjvm.so is installed there (append a fake suffix
1512 // hotspot/libjvm.so).
1513 const char *p = buf + strlen(buf) - 1;
1514 for (int count = 0; p > buf && count < 4; ++count) {
1515 for (--p; p > buf && *p != '/'; --p)
1516 /* empty */ ;
1517 }
1518
1519 if (strncmp(p, "/jre/lib/", 9) != 0) {
1520 // Look for JAVA_HOME in the environment.
1521 char* java_home_var = ::getenv("JAVA_HOME");
1522 if (java_home_var != NULL && java_home_var[0] != 0) {
1523 char* jrelib_p;
1524 int len;
1525
1526 // Check the current module name "libjvm.so".
1527 p = strrchr(buf, '/');
1528 if (p == NULL) {
1529 return;
1530 }
1531 assert(strstr(p, "/libjvm") == p, "invalid library name");
1532
1533 rp = os::Posix::realpath(java_home_var, buf, buflen);
1534 if (rp == NULL) {
1535 return;
1536 }
1537
1538 // determine if this is a legacy image or modules image
1539 // modules image doesn't have "jre" subdirectory
1540 len = strlen(buf);
1541 assert(len < buflen, "Ran out of buffer room");
1542 jrelib_p = buf + len;
1543 snprintf(jrelib_p, buflen-len, "/jre/lib");
1544 if (0 != access(buf, F_OK)) {
1545 snprintf(jrelib_p, buflen-len, "/lib");
1546 }
1547
1548 if (0 == access(buf, F_OK)) {
1549 // Use current module name "libjvm.so"
1550 len = strlen(buf);
1551 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1552 } else {
1553 // Go back to path of .so
1554 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1555 if (rp == NULL) {
1556 return;
1557 }
1558 }
1559 }
1560 }
1561 }
1562
1563 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1564 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1565 }
1566
1567 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1568 // no prefix required, not even "_"
1569 }
1570
1571 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1572 // no suffix required
1573 }
1574
1575 ////////////////////////////////////////////////////////////////////////////////
1576 // sun.misc.Signal support
1577
1578 static volatile jint sigint_count = 0;
1579
1580 static void
1581 UserHandler(int sig, void *siginfo, void *context) {
1582 // 4511530 - sem_post is serialized and handled by the manager thread. When
1583 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1584 // don't want to flood the manager thread with sem_post requests.
1585 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1586 return;
1587
1588 // Ctrl-C is pressed during error reporting, likely because the error
1589 // handler fails to abort. Let VM die immediately.
1590 if (sig == SIGINT && VMError::is_error_reported()) {
1591 os::die();
1592 }
1593
1594 os::signal_notify(sig);
1595 }
1596
1597 void* os::user_handler() {
1598 return CAST_FROM_FN_PTR(void*, UserHandler);
1599 }
1600
1601 extern "C" {
1602 typedef void (*sa_handler_t)(int);
1603 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1604 }
1605
1606 void* os::signal(int signal_number, void* handler) {
1607 struct sigaction sigAct, oldSigAct;
1608
1609 sigfillset(&(sigAct.sa_mask));
1610
1611 // Do not block out synchronous signals in the signal handler.
1612 // Blocking synchronous signals only makes sense if you can really
1613 // be sure that those signals won't happen during signal handling,
1614 // when the blocking applies. Normal signal handlers are lean and
1615 // do not cause signals. But our signal handlers tend to be "risky"
1616 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1617 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1618 // by a SIGILL, which was blocked due to the signal mask. The process
1619 // just hung forever. Better to crash from a secondary signal than to hang.
1620 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1621 sigdelset(&(sigAct.sa_mask), SIGBUS);
1622 sigdelset(&(sigAct.sa_mask), SIGILL);
1623 sigdelset(&(sigAct.sa_mask), SIGFPE);
1624 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1625
1626 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1627
1628 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1629
1630 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1631 // -1 means registration failed
1632 return (void *)-1;
1633 }
1634
1635 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1636 }
1637
1638 void os::signal_raise(int signal_number) {
1639 ::raise(signal_number);
1640 }
1641
1642 //
1643 // The following code is moved from os.cpp for making this
1644 // code platform specific, which it is by its very nature.
1645 //
1646
1647 // Will be modified when max signal is changed to be dynamic
1648 int os::sigexitnum_pd() {
1649 return NSIG;
1650 }
1651
1652 // a counter for each possible signal value
1653 static volatile jint pending_signals[NSIG+1] = { 0 };
1654
1655 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1656 // On AIX, we use sem_init(), sem_post(), sem_wait()
1657 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1658 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1659 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1660 // on AIX, msem_..() calls are suspected of causing problems.
1661 static sem_t sig_sem;
1662 static msemaphore* p_sig_msem = 0;
1663
1664 static void local_sem_init() {
1665 if (os::Aix::on_aix()) {
1666 int rc = ::sem_init(&sig_sem, 0, 0);
1667 guarantee(rc != -1, "sem_init failed");
1668 } else {
1669 // Memory semaphores must live in shared mem.
1670 guarantee0(p_sig_msem == NULL);
1671 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1672 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1673 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1674 }
1675 }
1676
1677 static void local_sem_post() {
1678 static bool warn_only_once = false;
1679 if (os::Aix::on_aix()) {
1680 int rc = ::sem_post(&sig_sem);
1681 if (rc == -1 && !warn_only_once) {
1682 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1683 warn_only_once = true;
1684 }
1685 } else {
1686 guarantee0(p_sig_msem != NULL);
1687 int rc = ::msem_unlock(p_sig_msem, 0);
1688 if (rc == -1 && !warn_only_once) {
1689 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1690 warn_only_once = true;
1691 }
1692 }
1693 }
1694
1695 static void local_sem_wait() {
1696 static bool warn_only_once = false;
1697 if (os::Aix::on_aix()) {
1698 int rc = ::sem_wait(&sig_sem);
1699 if (rc == -1 && !warn_only_once) {
1700 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1701 warn_only_once = true;
1702 }
1703 } else {
1704 guarantee0(p_sig_msem != NULL); // must init before use
1705 int rc = ::msem_lock(p_sig_msem, 0);
1706 if (rc == -1 && !warn_only_once) {
1707 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1708 warn_only_once = true;
1709 }
1710 }
1711 }
1712
1713 void os::signal_init_pd() {
1714 // Initialize signal structures
1715 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1716
1717 // Initialize signal semaphore
1718 local_sem_init();
1719 }
1720
1721 void os::signal_notify(int sig) {
1722 Atomic::inc(&pending_signals[sig]);
1723 local_sem_post();
1724 }
1725
1726 static int check_pending_signals(bool wait) {
1727 Atomic::store(0, &sigint_count);
1728 for (;;) {
1729 for (int i = 0; i < NSIG + 1; i++) {
1730 jint n = pending_signals[i];
1731 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1732 return i;
1733 }
1734 }
1735 if (!wait) {
1736 return -1;
1737 }
1738 JavaThread *thread = JavaThread::current();
1739 ThreadBlockInVM tbivm(thread);
1740
1741 bool threadIsSuspended;
1742 do {
1743 thread->set_suspend_equivalent();
1744 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1745
1746 local_sem_wait();
1747
1748 // were we externally suspended while we were waiting?
1749 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1750 if (threadIsSuspended) {
1751 //
1752 // The semaphore has been incremented, but while we were waiting
1753 // another thread suspended us. We don't want to continue running
1754 // while suspended because that would surprise the thread that
1755 // suspended us.
1756 //
1757
1758 local_sem_post();
1759
1760 thread->java_suspend_self();
1761 }
1762 } while (threadIsSuspended);
1763 }
1764 }
1765
1766 int os::signal_lookup() {
1767 return check_pending_signals(false);
1768 }
1769
1770 int os::signal_wait() {
1771 return check_pending_signals(true);
1772 }
1773
1774 ////////////////////////////////////////////////////////////////////////////////
1775 // Virtual Memory
1776
1777 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1778
1779 #define VMEM_MAPPED 1
1780 #define VMEM_SHMATED 2
1781
1782 struct vmembk_t {
1783 int type; // 1 - mmap, 2 - shmat
1784 char* addr;
1785 size_t size; // Real size, may be larger than usersize.
1786 size_t pagesize; // page size of area
1787 vmembk_t* next;
1788
1789 bool contains_addr(char* p) const {
1790 return p >= addr && p < (addr + size);
1791 }
1792
1793 bool contains_range(char* p, size_t s) const {
1794 return contains_addr(p) && contains_addr(p + s - 1);
1795 }
1796
1797 void print_on(outputStream* os) const {
1798 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1799 " bytes, %d %s pages), %s",
1800 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1801 (type == VMEM_SHMATED ? "shmat" : "mmap")
1802 );
1803 }
1804
1805 // Check that range is a sub range of memory block (or equal to memory block);
1806 // also check that range is fully page aligned to the page size if the block.
1807 void assert_is_valid_subrange(char* p, size_t s) const {
1808 if (!contains_range(p, s)) {
1809 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1810 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1811 p, p + s, addr, addr + size);
1812 guarantee0(false);
1813 }
1814 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1815 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1816 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1817 guarantee0(false);
1818 }
1819 }
1820 };
1821
1822 static struct {
1823 vmembk_t* first;
1824 MiscUtils::CritSect cs;
1825 } vmem;
1826
1827 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1828 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1829 assert0(p);
1830 if (p) {
1831 MiscUtils::AutoCritSect lck(&vmem.cs);
1832 p->addr = addr; p->size = size;
1833 p->pagesize = pagesize;
1834 p->type = type;
1835 p->next = vmem.first;
1836 vmem.first = p;
1837 }
1838 }
1839
1840 static vmembk_t* vmembk_find(char* addr) {
1841 MiscUtils::AutoCritSect lck(&vmem.cs);
1842 for (vmembk_t* p = vmem.first; p; p = p->next) {
1843 if (p->addr <= addr && (p->addr + p->size) > addr) {
1844 return p;
1845 }
1846 }
1847 return NULL;
1848 }
1849
1850 static void vmembk_remove(vmembk_t* p0) {
1851 MiscUtils::AutoCritSect lck(&vmem.cs);
1852 assert0(p0);
1853 assert0(vmem.first); // List should not be empty.
1854 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1855 if (*pp == p0) {
1856 *pp = p0->next;
1857 ::free(p0);
1858 return;
1859 }
1860 }
1861 assert0(false); // Not found?
1862 }
1863
1864 static void vmembk_print_on(outputStream* os) {
1865 MiscUtils::AutoCritSect lck(&vmem.cs);
1866 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1867 vmi->print_on(os);
1868 os->cr();
1869 }
1870 }
1871
1872 // Reserve and attach a section of System V memory.
1873 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1874 // address. Failing that, it will attach the memory anywhere.
1875 // If <requested_addr> is NULL, function will attach the memory anywhere.
1876 //
1877 // <alignment_hint> is being ignored by this function. It is very probable however that the
1878 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1879 // Should this be not enogh, we can put more work into it.
1880 static char* reserve_shmated_memory (
1881 size_t bytes,
1882 char* requested_addr,
1883 size_t alignment_hint) {
1884
1885 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1886 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1887 bytes, requested_addr, alignment_hint);
1888
1889 // Either give me wish address or wish alignment but not both.
1890 assert0(!(requested_addr != NULL && alignment_hint != 0));
1891
1892 // We must prevent anyone from attaching too close to the
1893 // BRK because that may cause malloc OOM.
1894 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1895 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1896 "Will attach anywhere.", requested_addr);
1897 // Act like the OS refused to attach there.
1898 requested_addr = NULL;
1899 }
1900
1901 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1902 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1903 if (os::Aix::on_pase_V5R4_or_older()) {
1904 ShouldNotReachHere();
1905 }
1906
1907 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1908 const size_t size = align_up(bytes, 64*K);
1909
1910 // Reserve the shared segment.
1911 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1912 if (shmid == -1) {
1913 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1914 return NULL;
1915 }
1916
1917 // Important note:
1918 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1919 // We must right after attaching it remove it from the system. System V shm segments are global and
1920 // survive the process.
1921 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1922
1923 struct shmid_ds shmbuf;
1924 memset(&shmbuf, 0, sizeof(shmbuf));
1925 shmbuf.shm_pagesize = 64*K;
1926 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1927 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1928 size / (64*K), errno);
1929 // I want to know if this ever happens.
1930 assert(false, "failed to set page size for shmat");
1931 }
1932
1933 // Now attach the shared segment.
1934 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1935 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1936 // were not a segment boundary.
1937 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1938 const int errno_shmat = errno;
1939
1940 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1941 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1942 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1943 assert(false, "failed to remove shared memory segment!");
1944 }
1945
1946 // Handle shmat error. If we failed to attach, just return.
1947 if (addr == (char*)-1) {
1948 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1949 return NULL;
1950 }
1951
1952 // Just for info: query the real page size. In case setting the page size did not
1953 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
1954 const size_t real_pagesize = os::Aix::query_pagesize(addr);
1955 if (real_pagesize != shmbuf.shm_pagesize) {
1956 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
1957 }
1958
1959 if (addr) {
1960 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
1961 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
1962 } else {
1963 if (requested_addr != NULL) {
1964 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
1965 } else {
1966 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
1967 }
1968 }
1969
1970 // book-keeping
1971 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
1972 assert0(is_aligned_to(addr, os::vm_page_size()));
1973
1974 return addr;
1975 }
1976
1977 static bool release_shmated_memory(char* addr, size_t size) {
1978
1979 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
1980 addr, addr + size - 1);
1981
1982 bool rc = false;
1983
1984 // TODO: is there a way to verify shm size without doing bookkeeping?
1985 if (::shmdt(addr) != 0) {
1986 trcVerbose("error (%d).", errno);
1987 } else {
1988 trcVerbose("ok.");
1989 rc = true;
1990 }
1991 return rc;
1992 }
1993
1994 static bool uncommit_shmated_memory(char* addr, size_t size) {
1995 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
1996 addr, addr + size - 1);
1997
1998 const bool rc = my_disclaim64(addr, size);
1999
2000 if (!rc) {
2001 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2002 return false;
2003 }
2004 return true;
2005 }
2006
2007 //////////////////////////////// mmap-based routines /////////////////////////////////
2008
2009 // Reserve memory via mmap.
2010 // If <requested_addr> is given, an attempt is made to attach at the given address.
2011 // Failing that, memory is allocated at any address.
2012 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2013 // allocate at an address aligned with the given alignment. Failing that, memory
2014 // is aligned anywhere.
2015 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2016 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2017 "alignment_hint " UINTX_FORMAT "...",
2018 bytes, requested_addr, alignment_hint);
2019
2020 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2021 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2022 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2023 return NULL;
2024 }
2025
2026 // We must prevent anyone from attaching too close to the
2027 // BRK because that may cause malloc OOM.
2028 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2029 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2030 "Will attach anywhere.", requested_addr);
2031 // Act like the OS refused to attach there.
2032 requested_addr = NULL;
2033 }
2034
2035 // Specify one or the other but not both.
2036 assert0(!(requested_addr != NULL && alignment_hint > 0));
2037
2038 // In 64K mode, we claim the global page size (os::vm_page_size())
2039 // is 64K. This is one of the few points where that illusion may
2040 // break, because mmap() will always return memory aligned to 4K. So
2041 // we must ensure we only ever return memory aligned to 64k.
2042 if (alignment_hint) {
2043 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2044 } else {
2045 alignment_hint = os::vm_page_size();
2046 }
2047
2048 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2049 const size_t size = align_up(bytes, os::vm_page_size());
2050
2051 // alignment: Allocate memory large enough to include an aligned range of the right size and
2052 // cut off the leading and trailing waste pages.
2053 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2054 const size_t extra_size = size + alignment_hint;
2055
2056 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2057 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2058 int flags = MAP_ANONYMOUS | MAP_SHARED;
2059
2060 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2061 // it means if wishaddress is given but MAP_FIXED is not set.
2062 //
2063 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2064 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2065 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2066 // get clobbered.
2067 if (requested_addr != NULL) {
2068 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2069 flags |= MAP_FIXED;
2070 }
2071 }
2072
2073 char* addr = (char*)::mmap(requested_addr, extra_size,
2074 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2075
2076 if (addr == MAP_FAILED) {
2077 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2078 return NULL;
2079 }
2080
2081 // Handle alignment.
2082 char* const addr_aligned = align_up(addr, alignment_hint);
2083 const size_t waste_pre = addr_aligned - addr;
2084 char* const addr_aligned_end = addr_aligned + size;
2085 const size_t waste_post = extra_size - waste_pre - size;
2086 if (waste_pre > 0) {
2087 ::munmap(addr, waste_pre);
2088 }
2089 if (waste_post > 0) {
2090 ::munmap(addr_aligned_end, waste_post);
2091 }
2092 addr = addr_aligned;
2093
2094 if (addr) {
2095 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2096 addr, addr + bytes, bytes);
2097 } else {
2098 if (requested_addr != NULL) {
2099 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2100 } else {
2101 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2102 }
2103 }
2104
2105 // bookkeeping
2106 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2107
2108 // Test alignment, see above.
2109 assert0(is_aligned_to(addr, os::vm_page_size()));
2110
2111 return addr;
2112 }
2113
2114 static bool release_mmaped_memory(char* addr, size_t size) {
2115 assert0(is_aligned_to(addr, os::vm_page_size()));
2116 assert0(is_aligned_to(size, os::vm_page_size()));
2117
2118 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2119 addr, addr + size - 1);
2120 bool rc = false;
2121
2122 if (::munmap(addr, size) != 0) {
2123 trcVerbose("failed (%d)\n", errno);
2124 rc = false;
2125 } else {
2126 trcVerbose("ok.");
2127 rc = true;
2128 }
2129
2130 return rc;
2131 }
2132
2133 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2134
2135 assert0(is_aligned_to(addr, os::vm_page_size()));
2136 assert0(is_aligned_to(size, os::vm_page_size()));
2137
2138 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2139 addr, addr + size - 1);
2140 bool rc = false;
2141
2142 // Uncommit mmap memory with msync MS_INVALIDATE.
2143 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2144 trcVerbose("failed (%d)\n", errno);
2145 rc = false;
2146 } else {
2147 trcVerbose("ok.");
2148 rc = true;
2149 }
2150
2151 return rc;
2152 }
2153
2154 int os::vm_page_size() {
2155 // Seems redundant as all get out.
2156 assert(os::Aix::page_size() != -1, "must call os::init");
2157 return os::Aix::page_size();
2158 }
2159
2160 // Aix allocates memory by pages.
2161 int os::vm_allocation_granularity() {
2162 assert(os::Aix::page_size() != -1, "must call os::init");
2163 return os::Aix::page_size();
2164 }
2165
2166 #ifdef PRODUCT
2167 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2168 int err) {
2169 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2170 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2171 os::errno_name(err), err);
2172 }
2173 #endif
2174
2175 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2176 const char* mesg) {
2177 assert(mesg != NULL, "mesg must be specified");
2178 if (!pd_commit_memory(addr, size, exec)) {
2179 // Add extra info in product mode for vm_exit_out_of_memory():
2180 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2181 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2182 }
2183 }
2184
2185 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2186
2187 assert(is_aligned_to(addr, os::vm_page_size()),
2188 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2189 p2i(addr), os::vm_page_size());
2190 assert(is_aligned_to(size, os::vm_page_size()),
2191 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2192 size, os::vm_page_size());
2193
2194 vmembk_t* const vmi = vmembk_find(addr);
2195 guarantee0(vmi);
2196 vmi->assert_is_valid_subrange(addr, size);
2197
2198 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2199
2200 if (UseExplicitCommit) {
2201 // AIX commits memory on touch. So, touch all pages to be committed.
2202 for (char* p = addr; p < (addr + size); p += 4*K) {
2203 *p = '\0';
2204 }
2205 }
2206
2207 return true;
2208 }
2209
2210 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2211 return pd_commit_memory(addr, size, exec);
2212 }
2213
2214 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2215 size_t alignment_hint, bool exec,
2216 const char* mesg) {
2217 // Alignment_hint is ignored on this OS.
2218 pd_commit_memory_or_exit(addr, size, exec, mesg);
2219 }
2220
2221 bool os::pd_uncommit_memory(char* addr, size_t size) {
2222 assert(is_aligned_to(addr, os::vm_page_size()),
2223 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2224 p2i(addr), os::vm_page_size());
2225 assert(is_aligned_to(size, os::vm_page_size()),
2226 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2227 size, os::vm_page_size());
2228
2229 // Dynamically do different things for mmap/shmat.
2230 const vmembk_t* const vmi = vmembk_find(addr);
2231 guarantee0(vmi);
2232 vmi->assert_is_valid_subrange(addr, size);
2233
2234 if (vmi->type == VMEM_SHMATED) {
2235 return uncommit_shmated_memory(addr, size);
2236 } else {
2237 return uncommit_mmaped_memory(addr, size);
2238 }
2239 }
2240
2241 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2242 // Do not call this; no need to commit stack pages on AIX.
2243 ShouldNotReachHere();
2244 return true;
2245 }
2246
2247 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2248 // Do not call this; no need to commit stack pages on AIX.
2249 ShouldNotReachHere();
2250 return true;
2251 }
2252
2253 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2254 }
2255
2256 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2257 }
2258
2259 void os::numa_make_global(char *addr, size_t bytes) {
2260 }
2261
2262 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2263 }
2264
2265 bool os::numa_topology_changed() {
2266 return false;
2267 }
2268
2269 size_t os::numa_get_groups_num() {
2270 return 1;
2271 }
2272
2273 int os::numa_get_group_id() {
2274 return 0;
2275 }
2276
2277 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2278 if (size > 0) {
2279 ids[0] = 0;
2280 return 1;
2281 }
2282 return 0;
2283 }
2284
2285 bool os::get_page_info(char *start, page_info* info) {
2286 return false;
2287 }
2288
2289 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2290 return end;
2291 }
2292
2293 // Reserves and attaches a shared memory segment.
2294 // Will assert if a wish address is given and could not be obtained.
2295 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2296
2297 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2298 // thereby clobbering old mappings at that place. That is probably
2299 // not intended, never used and almost certainly an error were it
2300 // ever be used this way (to try attaching at a specified address
2301 // without clobbering old mappings an alternate API exists,
2302 // os::attempt_reserve_memory_at()).
2303 // Instead of mimicking the dangerous coding of the other platforms, here I
2304 // just ignore the request address (release) or assert(debug).
2305 assert0(requested_addr == NULL);
2306
2307 // Always round to os::vm_page_size(), which may be larger than 4K.
2308 bytes = align_up(bytes, os::vm_page_size());
2309 const size_t alignment_hint0 =
2310 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2311
2312 // In 4K mode always use mmap.
2313 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2314 if (os::vm_page_size() == 4*K) {
2315 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2316 } else {
2317 if (bytes >= Use64KPagesThreshold) {
2318 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2319 } else {
2320 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2321 }
2322 }
2323 }
2324
2325 bool os::pd_release_memory(char* addr, size_t size) {
2326
2327 // Dynamically do different things for mmap/shmat.
2328 vmembk_t* const vmi = vmembk_find(addr);
2329 guarantee0(vmi);
2330
2331 // Always round to os::vm_page_size(), which may be larger than 4K.
2332 size = align_up(size, os::vm_page_size());
2333 addr = align_up(addr, os::vm_page_size());
2334
2335 bool rc = false;
2336 bool remove_bookkeeping = false;
2337 if (vmi->type == VMEM_SHMATED) {
2338 // For shmatted memory, we do:
2339 // - If user wants to release the whole range, release the memory (shmdt).
2340 // - If user only wants to release a partial range, uncommit (disclaim) that
2341 // range. That way, at least, we do not use memory anymore (bust still page
2342 // table space).
2343 vmi->assert_is_valid_subrange(addr, size);
2344 if (addr == vmi->addr && size == vmi->size) {
2345 rc = release_shmated_memory(addr, size);
2346 remove_bookkeeping = true;
2347 } else {
2348 rc = uncommit_shmated_memory(addr, size);
2349 }
2350 } else {
2351 // User may unmap partial regions but region has to be fully contained.
2352 #ifdef ASSERT
2353 vmi->assert_is_valid_subrange(addr, size);
2354 #endif
2355 rc = release_mmaped_memory(addr, size);
2356 remove_bookkeeping = true;
2357 }
2358
2359 // update bookkeeping
2360 if (rc && remove_bookkeeping) {
2361 vmembk_remove(vmi);
2362 }
2363
2364 return rc;
2365 }
2366
2367 static bool checked_mprotect(char* addr, size_t size, int prot) {
2368
2369 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2370 // not tell me if protection failed when trying to protect an un-protectable range.
2371 //
2372 // This means if the memory was allocated using shmget/shmat, protection wont work
2373 // but mprotect will still return 0:
2374 //
2375 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2376
2377 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2378
2379 if (!rc) {
2380 const char* const s_errno = os::errno_name(errno);
2381 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2382 return false;
2383 }
2384
2385 // mprotect success check
2386 //
2387 // Mprotect said it changed the protection but can I believe it?
2388 //
2389 // To be sure I need to check the protection afterwards. Try to
2390 // read from protected memory and check whether that causes a segfault.
2391 //
2392 if (!os::Aix::xpg_sus_mode()) {
2393
2394 if (CanUseSafeFetch32()) {
2395
2396 const bool read_protected =
2397 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2398 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2399
2400 if (prot & PROT_READ) {
2401 rc = !read_protected;
2402 } else {
2403 rc = read_protected;
2404 }
2405
2406 if (!rc) {
2407 if (os::Aix::on_pase()) {
2408 // There is an issue on older PASE systems where mprotect() will return success but the
2409 // memory will not be protected.
2410 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2411 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2412 // a stack. It is an OS error.
2413 //
2414 // A valid strategy is just to try again. This usually works. :-/
2415
2416 ::usleep(1000);
2417 if (::mprotect(addr, size, prot) == 0) {
2418 const bool read_protected_2 =
2419 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2420 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2421 rc = true;
2422 }
2423 }
2424 }
2425 }
2426 }
2427
2428 assert(rc == true, "mprotect failed.");
2429
2430 return rc;
2431 }
2432
2433 // Set protections specified
2434 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2435 unsigned int p = 0;
2436 switch (prot) {
2437 case MEM_PROT_NONE: p = PROT_NONE; break;
2438 case MEM_PROT_READ: p = PROT_READ; break;
2439 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2440 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2441 default:
2442 ShouldNotReachHere();
2443 }
2444 // is_committed is unused.
2445 return checked_mprotect(addr, size, p);
2446 }
2447
2448 bool os::guard_memory(char* addr, size_t size) {
2449 return checked_mprotect(addr, size, PROT_NONE);
2450 }
2451
2452 bool os::unguard_memory(char* addr, size_t size) {
2453 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2454 }
2455
2456 // Large page support
2457
2458 static size_t _large_page_size = 0;
2459
2460 // Enable large page support if OS allows that.
2461 void os::large_page_init() {
2462 return; // Nothing to do. See query_multipage_support and friends.
2463 }
2464
2465 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2466 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2467 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2468 // so this is not needed.
2469 assert(false, "should not be called on AIX");
2470 return NULL;
2471 }
2472
2473 bool os::release_memory_special(char* base, size_t bytes) {
2474 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2475 Unimplemented();
2476 return false;
2477 }
2478
2479 size_t os::large_page_size() {
2480 return _large_page_size;
2481 }
2482
2483 bool os::can_commit_large_page_memory() {
2484 // Does not matter, we do not support huge pages.
2485 return false;
2486 }
2487
2488 bool os::can_execute_large_page_memory() {
2489 // Does not matter, we do not support huge pages.
2490 return false;
2491 }
2492
2493 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
2494 assert(file_desc >= 0, "file_desc is not valid");
2495 char* result = NULL;
2496
2497 // Always round to os::vm_page_size(), which may be larger than 4K.
2498 bytes = align_up(bytes, os::vm_page_size());
2499 result = reserve_mmaped_memory(bytes, requested_addr, 0);
2500
2501 if (result != NULL) {
2502 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
2503 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
2504 }
2505 }
2506 return result;
2507 }
2508
2509 // Reserve memory at an arbitrary address, only if that area is
2510 // available (and not reserved for something else).
2511 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2512 char* addr = NULL;
2513
2514 // Always round to os::vm_page_size(), which may be larger than 4K.
2515 bytes = align_up(bytes, os::vm_page_size());
2516
2517 // In 4K mode always use mmap.
2518 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2519 if (os::vm_page_size() == 4*K) {
2520 return reserve_mmaped_memory(bytes, requested_addr, 0);
2521 } else {
2522 if (bytes >= Use64KPagesThreshold) {
2523 return reserve_shmated_memory(bytes, requested_addr, 0);
2524 } else {
2525 return reserve_mmaped_memory(bytes, requested_addr, 0);
2526 }
2527 }
2528
2529 return addr;
2530 }
2531
2532 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2533 return ::read(fd, buf, nBytes);
2534 }
2535
2536 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2537 return ::pread(fd, buf, nBytes, offset);
2538 }
2539
2540 void os::naked_short_sleep(jlong ms) {
2541 struct timespec req;
2542
2543 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2544 req.tv_sec = 0;
2545 if (ms > 0) {
2546 req.tv_nsec = (ms % 1000) * 1000000;
2547 }
2548 else {
2549 req.tv_nsec = 1;
2550 }
2551
2552 nanosleep(&req, NULL);
2553
2554 return;
2555 }
2556
2557 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2558 void os::infinite_sleep() {
2559 while (true) { // sleep forever ...
2560 ::sleep(100); // ... 100 seconds at a time
2561 }
2562 }
2563
2564 // Used to convert frequent JVM_Yield() to nops
2565 bool os::dont_yield() {
2566 return DontYieldALot;
2567 }
2568
2569 void os::naked_yield() {
2570 sched_yield();
2571 }
2572
2573 ////////////////////////////////////////////////////////////////////////////////
2574 // thread priority support
2575
2576 // From AIX manpage to pthread_setschedparam
2577 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2578 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2579 //
2580 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2581 // range from 40 to 80, where 40 is the least favored priority and 80
2582 // is the most favored."
2583 //
2584 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2585 // scheduling there; however, this still leaves iSeries.)
2586 //
2587 // We use the same values for AIX and PASE.
2588 int os::java_to_os_priority[CriticalPriority + 1] = {
2589 54, // 0 Entry should never be used
2590
2591 55, // 1 MinPriority
2592 55, // 2
2593 56, // 3
2594
2595 56, // 4
2596 57, // 5 NormPriority
2597 57, // 6
2598
2599 58, // 7
2600 58, // 8
2601 59, // 9 NearMaxPriority
2602
2603 60, // 10 MaxPriority
2604
2605 60 // 11 CriticalPriority
2606 };
2607
2608 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2609 if (!UseThreadPriorities) return OS_OK;
2610 pthread_t thr = thread->osthread()->pthread_id();
2611 int policy = SCHED_OTHER;
2612 struct sched_param param;
2613 param.sched_priority = newpri;
2614 int ret = pthread_setschedparam(thr, policy, ¶m);
2615
2616 if (ret != 0) {
2617 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2618 (int)thr, newpri, ret, os::errno_name(ret));
2619 }
2620 return (ret == 0) ? OS_OK : OS_ERR;
2621 }
2622
2623 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2624 if (!UseThreadPriorities) {
2625 *priority_ptr = java_to_os_priority[NormPriority];
2626 return OS_OK;
2627 }
2628 pthread_t thr = thread->osthread()->pthread_id();
2629 int policy = SCHED_OTHER;
2630 struct sched_param param;
2631 int ret = pthread_getschedparam(thr, &policy, ¶m);
2632 *priority_ptr = param.sched_priority;
2633
2634 return (ret == 0) ? OS_OK : OS_ERR;
2635 }
2636
2637 // Hint to the underlying OS that a task switch would not be good.
2638 // Void return because it's a hint and can fail.
2639 void os::hint_no_preempt() {}
2640
2641 ////////////////////////////////////////////////////////////////////////////////
2642 // suspend/resume support
2643
2644 // The low-level signal-based suspend/resume support is a remnant from the
2645 // old VM-suspension that used to be for java-suspension, safepoints etc,
2646 // within hotspot. Currently used by JFR's OSThreadSampler
2647 //
2648 // The remaining code is greatly simplified from the more general suspension
2649 // code that used to be used.
2650 //
2651 // The protocol is quite simple:
2652 // - suspend:
2653 // - sends a signal to the target thread
2654 // - polls the suspend state of the osthread using a yield loop
2655 // - target thread signal handler (SR_handler) sets suspend state
2656 // and blocks in sigsuspend until continued
2657 // - resume:
2658 // - sets target osthread state to continue
2659 // - sends signal to end the sigsuspend loop in the SR_handler
2660 //
2661 // Note that the SR_lock plays no role in this suspend/resume protocol,
2662 // but is checked for NULL in SR_handler as a thread termination indicator.
2663 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2664 //
2665 // Note that resume_clear_context() and suspend_save_context() are needed
2666 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2667 // which in part is used by:
2668 // - Forte Analyzer: AsyncGetCallTrace()
2669 // - StackBanging: get_frame_at_stack_banging_point()
2670
2671 static void resume_clear_context(OSThread *osthread) {
2672 osthread->set_ucontext(NULL);
2673 osthread->set_siginfo(NULL);
2674 }
2675
2676 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2677 osthread->set_ucontext(context);
2678 osthread->set_siginfo(siginfo);
2679 }
2680
2681 //
2682 // Handler function invoked when a thread's execution is suspended or
2683 // resumed. We have to be careful that only async-safe functions are
2684 // called here (Note: most pthread functions are not async safe and
2685 // should be avoided.)
2686 //
2687 // Note: sigwait() is a more natural fit than sigsuspend() from an
2688 // interface point of view, but sigwait() prevents the signal hander
2689 // from being run. libpthread would get very confused by not having
2690 // its signal handlers run and prevents sigwait()'s use with the
2691 // mutex granting granting signal.
2692 //
2693 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2694 //
2695 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2696 // Save and restore errno to avoid confusing native code with EINTR
2697 // after sigsuspend.
2698 int old_errno = errno;
2699
2700 Thread* thread = Thread::current_or_null_safe();
2701 assert(thread != NULL, "Missing current thread in SR_handler");
2702
2703 // On some systems we have seen signal delivery get "stuck" until the signal
2704 // mask is changed as part of thread termination. Check that the current thread
2705 // has not already terminated (via SR_lock()) - else the following assertion
2706 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2707 // destructor has completed.
2708
2709 if (thread->SR_lock() == NULL) {
2710 return;
2711 }
2712
2713 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2714
2715 OSThread* osthread = thread->osthread();
2716
2717 os::SuspendResume::State current = osthread->sr.state();
2718 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2719 suspend_save_context(osthread, siginfo, context);
2720
2721 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2722 os::SuspendResume::State state = osthread->sr.suspended();
2723 if (state == os::SuspendResume::SR_SUSPENDED) {
2724 sigset_t suspend_set; // signals for sigsuspend()
2725
2726 // get current set of blocked signals and unblock resume signal
2727 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2728 sigdelset(&suspend_set, SR_signum);
2729
2730 // wait here until we are resumed
2731 while (1) {
2732 sigsuspend(&suspend_set);
2733
2734 os::SuspendResume::State result = osthread->sr.running();
2735 if (result == os::SuspendResume::SR_RUNNING) {
2736 break;
2737 }
2738 }
2739
2740 } else if (state == os::SuspendResume::SR_RUNNING) {
2741 // request was cancelled, continue
2742 } else {
2743 ShouldNotReachHere();
2744 }
2745
2746 resume_clear_context(osthread);
2747 } else if (current == os::SuspendResume::SR_RUNNING) {
2748 // request was cancelled, continue
2749 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2750 // ignore
2751 } else {
2752 ShouldNotReachHere();
2753 }
2754
2755 errno = old_errno;
2756 }
2757
2758 static int SR_initialize() {
2759 struct sigaction act;
2760 char *s;
2761 // Get signal number to use for suspend/resume
2762 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2763 int sig = ::strtol(s, 0, 10);
2764 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2765 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2766 SR_signum = sig;
2767 } else {
2768 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2769 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2770 }
2771 }
2772
2773 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2774 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2775
2776 sigemptyset(&SR_sigset);
2777 sigaddset(&SR_sigset, SR_signum);
2778
2779 // Set up signal handler for suspend/resume.
2780 act.sa_flags = SA_RESTART|SA_SIGINFO;
2781 act.sa_handler = (void (*)(int)) SR_handler;
2782
2783 // SR_signum is blocked by default.
2784 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2785
2786 if (sigaction(SR_signum, &act, 0) == -1) {
2787 return -1;
2788 }
2789
2790 // Save signal flag
2791 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2792 return 0;
2793 }
2794
2795 static int SR_finalize() {
2796 return 0;
2797 }
2798
2799 static int sr_notify(OSThread* osthread) {
2800 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2801 assert_status(status == 0, status, "pthread_kill");
2802 return status;
2803 }
2804
2805 // "Randomly" selected value for how long we want to spin
2806 // before bailing out on suspending a thread, also how often
2807 // we send a signal to a thread we want to resume
2808 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2809 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2810
2811 // returns true on success and false on error - really an error is fatal
2812 // but this seems the normal response to library errors
2813 static bool do_suspend(OSThread* osthread) {
2814 assert(osthread->sr.is_running(), "thread should be running");
2815 // mark as suspended and send signal
2816
2817 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2818 // failed to switch, state wasn't running?
2819 ShouldNotReachHere();
2820 return false;
2821 }
2822
2823 if (sr_notify(osthread) != 0) {
2824 // try to cancel, switch to running
2825
2826 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2827 if (result == os::SuspendResume::SR_RUNNING) {
2828 // cancelled
2829 return false;
2830 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2831 // somehow managed to suspend
2832 return true;
2833 } else {
2834 ShouldNotReachHere();
2835 return false;
2836 }
2837 }
2838
2839 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2840
2841 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2842 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2843 os::naked_yield();
2844 }
2845
2846 // timeout, try to cancel the request
2847 if (n >= RANDOMLY_LARGE_INTEGER) {
2848 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2849 if (cancelled == os::SuspendResume::SR_RUNNING) {
2850 return false;
2851 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2852 return true;
2853 } else {
2854 ShouldNotReachHere();
2855 return false;
2856 }
2857 }
2858 }
2859
2860 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2861 return true;
2862 }
2863
2864 static void do_resume(OSThread* osthread) {
2865 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2866
2867 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2868 // failed to switch to WAKEUP_REQUEST
2869 ShouldNotReachHere();
2870 return;
2871 }
2872
2873 while (!osthread->sr.is_running()) {
2874 if (sr_notify(osthread) == 0) {
2875 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2876 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2877 os::naked_yield();
2878 }
2879 }
2880 } else {
2881 ShouldNotReachHere();
2882 }
2883 }
2884
2885 guarantee(osthread->sr.is_running(), "Must be running!");
2886 }
2887
2888 ///////////////////////////////////////////////////////////////////////////////////
2889 // signal handling (except suspend/resume)
2890
2891 // This routine may be used by user applications as a "hook" to catch signals.
2892 // The user-defined signal handler must pass unrecognized signals to this
2893 // routine, and if it returns true (non-zero), then the signal handler must
2894 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2895 // routine will never retun false (zero), but instead will execute a VM panic
2896 // routine kill the process.
2897 //
2898 // If this routine returns false, it is OK to call it again. This allows
2899 // the user-defined signal handler to perform checks either before or after
2900 // the VM performs its own checks. Naturally, the user code would be making
2901 // a serious error if it tried to handle an exception (such as a null check
2902 // or breakpoint) that the VM was generating for its own correct operation.
2903 //
2904 // This routine may recognize any of the following kinds of signals:
2905 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2906 // It should be consulted by handlers for any of those signals.
2907 //
2908 // The caller of this routine must pass in the three arguments supplied
2909 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2910 // field of the structure passed to sigaction(). This routine assumes that
2911 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2912 //
2913 // Note that the VM will print warnings if it detects conflicting signal
2914 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2915 //
2916 extern "C" JNIEXPORT int
2917 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2918
2919 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2920 // to be the thing to call; documentation is not terribly clear about whether
2921 // pthread_sigmask also works, and if it does, whether it does the same.
2922 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2923 const int rc = ::pthread_sigmask(how, set, oset);
2924 // return value semantics differ slightly for error case:
2925 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2926 // (so, pthread_sigmask is more theadsafe for error handling)
2927 // But success is always 0.
2928 return rc == 0 ? true : false;
2929 }
2930
2931 // Function to unblock all signals which are, according
2932 // to POSIX, typical program error signals. If they happen while being blocked,
2933 // they typically will bring down the process immediately.
2934 bool unblock_program_error_signals() {
2935 sigset_t set;
2936 ::sigemptyset(&set);
2937 ::sigaddset(&set, SIGILL);
2938 ::sigaddset(&set, SIGBUS);
2939 ::sigaddset(&set, SIGFPE);
2940 ::sigaddset(&set, SIGSEGV);
2941 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2942 }
2943
2944 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2945 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2946 assert(info != NULL && uc != NULL, "it must be old kernel");
2947
2948 // Never leave program error signals blocked;
2949 // on all our platforms they would bring down the process immediately when
2950 // getting raised while being blocked.
2951 unblock_program_error_signals();
2952
2953 int orig_errno = errno; // Preserve errno value over signal handler.
2954 JVM_handle_aix_signal(sig, info, uc, true);
2955 errno = orig_errno;
2956 }
2957
2958 // This boolean allows users to forward their own non-matching signals
2959 // to JVM_handle_aix_signal, harmlessly.
2960 bool os::Aix::signal_handlers_are_installed = false;
2961
2962 // For signal-chaining
2963 struct sigaction sigact[NSIG];
2964 sigset_t sigs;
2965 bool os::Aix::libjsig_is_loaded = false;
2966 typedef struct sigaction *(*get_signal_t)(int);
2967 get_signal_t os::Aix::get_signal_action = NULL;
2968
2969 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
2970 struct sigaction *actp = NULL;
2971
2972 if (libjsig_is_loaded) {
2973 // Retrieve the old signal handler from libjsig
2974 actp = (*get_signal_action)(sig);
2975 }
2976 if (actp == NULL) {
2977 // Retrieve the preinstalled signal handler from jvm
2978 actp = get_preinstalled_handler(sig);
2979 }
2980
2981 return actp;
2982 }
2983
2984 static bool call_chained_handler(struct sigaction *actp, int sig,
2985 siginfo_t *siginfo, void *context) {
2986 // Call the old signal handler
2987 if (actp->sa_handler == SIG_DFL) {
2988 // It's more reasonable to let jvm treat it as an unexpected exception
2989 // instead of taking the default action.
2990 return false;
2991 } else if (actp->sa_handler != SIG_IGN) {
2992 if ((actp->sa_flags & SA_NODEFER) == 0) {
2993 // automaticlly block the signal
2994 sigaddset(&(actp->sa_mask), sig);
2995 }
2996
2997 sa_handler_t hand = NULL;
2998 sa_sigaction_t sa = NULL;
2999 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3000 // retrieve the chained handler
3001 if (siginfo_flag_set) {
3002 sa = actp->sa_sigaction;
3003 } else {
3004 hand = actp->sa_handler;
3005 }
3006
3007 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3008 actp->sa_handler = SIG_DFL;
3009 }
3010
3011 // try to honor the signal mask
3012 sigset_t oset;
3013 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3014
3015 // call into the chained handler
3016 if (siginfo_flag_set) {
3017 (*sa)(sig, siginfo, context);
3018 } else {
3019 (*hand)(sig);
3020 }
3021
3022 // restore the signal mask
3023 pthread_sigmask(SIG_SETMASK, &oset, 0);
3024 }
3025 // Tell jvm's signal handler the signal is taken care of.
3026 return true;
3027 }
3028
3029 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3030 bool chained = false;
3031 // signal-chaining
3032 if (UseSignalChaining) {
3033 struct sigaction *actp = get_chained_signal_action(sig);
3034 if (actp != NULL) {
3035 chained = call_chained_handler(actp, sig, siginfo, context);
3036 }
3037 }
3038 return chained;
3039 }
3040
3041 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3042 if (sigismember(&sigs, sig)) {
3043 return &sigact[sig];
3044 }
3045 return NULL;
3046 }
3047
3048 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3049 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3050 sigact[sig] = oldAct;
3051 sigaddset(&sigs, sig);
3052 }
3053
3054 // for diagnostic
3055 int sigflags[NSIG];
3056
3057 int os::Aix::get_our_sigflags(int sig) {
3058 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3059 return sigflags[sig];
3060 }
3061
3062 void os::Aix::set_our_sigflags(int sig, int flags) {
3063 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3064 if (sig > 0 && sig < NSIG) {
3065 sigflags[sig] = flags;
3066 }
3067 }
3068
3069 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3070 // Check for overwrite.
3071 struct sigaction oldAct;
3072 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3073
3074 void* oldhand = oldAct.sa_sigaction
3075 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3076 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3077 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3078 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3079 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3080 if (AllowUserSignalHandlers || !set_installed) {
3081 // Do not overwrite; user takes responsibility to forward to us.
3082 return;
3083 } else if (UseSignalChaining) {
3084 // save the old handler in jvm
3085 save_preinstalled_handler(sig, oldAct);
3086 // libjsig also interposes the sigaction() call below and saves the
3087 // old sigaction on it own.
3088 } else {
3089 fatal("Encountered unexpected pre-existing sigaction handler "
3090 "%#lx for signal %d.", (long)oldhand, sig);
3091 }
3092 }
3093
3094 struct sigaction sigAct;
3095 sigfillset(&(sigAct.sa_mask));
3096 if (!set_installed) {
3097 sigAct.sa_handler = SIG_DFL;
3098 sigAct.sa_flags = SA_RESTART;
3099 } else {
3100 sigAct.sa_sigaction = javaSignalHandler;
3101 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3102 }
3103 // Save flags, which are set by ours
3104 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3105 sigflags[sig] = sigAct.sa_flags;
3106
3107 int ret = sigaction(sig, &sigAct, &oldAct);
3108 assert(ret == 0, "check");
3109
3110 void* oldhand2 = oldAct.sa_sigaction
3111 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3112 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3113 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3114 }
3115
3116 // install signal handlers for signals that HotSpot needs to
3117 // handle in order to support Java-level exception handling.
3118 void os::Aix::install_signal_handlers() {
3119 if (!signal_handlers_are_installed) {
3120 signal_handlers_are_installed = true;
3121
3122 // signal-chaining
3123 typedef void (*signal_setting_t)();
3124 signal_setting_t begin_signal_setting = NULL;
3125 signal_setting_t end_signal_setting = NULL;
3126 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3127 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3128 if (begin_signal_setting != NULL) {
3129 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3130 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3131 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3132 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3133 libjsig_is_loaded = true;
3134 assert(UseSignalChaining, "should enable signal-chaining");
3135 }
3136 if (libjsig_is_loaded) {
3137 // Tell libjsig jvm is setting signal handlers.
3138 (*begin_signal_setting)();
3139 }
3140
3141 ::sigemptyset(&sigs);
3142 set_signal_handler(SIGSEGV, true);
3143 set_signal_handler(SIGPIPE, true);
3144 set_signal_handler(SIGBUS, true);
3145 set_signal_handler(SIGILL, true);
3146 set_signal_handler(SIGFPE, true);
3147 set_signal_handler(SIGTRAP, true);
3148 set_signal_handler(SIGXFSZ, true);
3149
3150 if (libjsig_is_loaded) {
3151 // Tell libjsig jvm finishes setting signal handlers.
3152 (*end_signal_setting)();
3153 }
3154
3155 // We don't activate signal checker if libjsig is in place, we trust ourselves
3156 // and if UserSignalHandler is installed all bets are off.
3157 // Log that signal checking is off only if -verbose:jni is specified.
3158 if (CheckJNICalls) {
3159 if (libjsig_is_loaded) {
3160 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3161 check_signals = false;
3162 }
3163 if (AllowUserSignalHandlers) {
3164 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3165 check_signals = false;
3166 }
3167 // Need to initialize check_signal_done.
3168 ::sigemptyset(&check_signal_done);
3169 }
3170 }
3171 }
3172
3173 static const char* get_signal_handler_name(address handler,
3174 char* buf, int buflen) {
3175 int offset;
3176 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3177 if (found) {
3178 // skip directory names
3179 const char *p1, *p2;
3180 p1 = buf;
3181 size_t len = strlen(os::file_separator());
3182 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3183 // The way os::dll_address_to_library_name is implemented on Aix
3184 // right now, it always returns -1 for the offset which is not
3185 // terribly informative.
3186 // Will fix that. For now, omit the offset.
3187 jio_snprintf(buf, buflen, "%s", p1);
3188 } else {
3189 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3190 }
3191 return buf;
3192 }
3193
3194 static void print_signal_handler(outputStream* st, int sig,
3195 char* buf, size_t buflen) {
3196 struct sigaction sa;
3197 sigaction(sig, NULL, &sa);
3198
3199 st->print("%s: ", os::exception_name(sig, buf, buflen));
3200
3201 address handler = (sa.sa_flags & SA_SIGINFO)
3202 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3203 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3204
3205 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3206 st->print("SIG_DFL");
3207 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3208 st->print("SIG_IGN");
3209 } else {
3210 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3211 }
3212
3213 // Print readable mask.
3214 st->print(", sa_mask[0]=");
3215 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3216
3217 address rh = VMError::get_resetted_sighandler(sig);
3218 // May be, handler was resetted by VMError?
3219 if (rh != NULL) {
3220 handler = rh;
3221 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3222 }
3223
3224 // Print textual representation of sa_flags.
3225 st->print(", sa_flags=");
3226 os::Posix::print_sa_flags(st, sa.sa_flags);
3227
3228 // Check: is it our handler?
3229 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3230 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3231 // It is our signal handler.
3232 // Check for flags, reset system-used one!
3233 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3234 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3235 os::Aix::get_our_sigflags(sig));
3236 }
3237 }
3238 st->cr();
3239 }
3240
3241 #define DO_SIGNAL_CHECK(sig) \
3242 if (!sigismember(&check_signal_done, sig)) \
3243 os::Aix::check_signal_handler(sig)
3244
3245 // This method is a periodic task to check for misbehaving JNI applications
3246 // under CheckJNI, we can add any periodic checks here
3247
3248 void os::run_periodic_checks() {
3249
3250 if (check_signals == false) return;
3251
3252 // SEGV and BUS if overridden could potentially prevent
3253 // generation of hs*.log in the event of a crash, debugging
3254 // such a case can be very challenging, so we absolutely
3255 // check the following for a good measure:
3256 DO_SIGNAL_CHECK(SIGSEGV);
3257 DO_SIGNAL_CHECK(SIGILL);
3258 DO_SIGNAL_CHECK(SIGFPE);
3259 DO_SIGNAL_CHECK(SIGBUS);
3260 DO_SIGNAL_CHECK(SIGPIPE);
3261 DO_SIGNAL_CHECK(SIGXFSZ);
3262 if (UseSIGTRAP) {
3263 DO_SIGNAL_CHECK(SIGTRAP);
3264 }
3265
3266 // ReduceSignalUsage allows the user to override these handlers
3267 // see comments at the very top and jvm_md.h
3268 if (!ReduceSignalUsage) {
3269 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3270 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3271 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3272 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3273 }
3274
3275 DO_SIGNAL_CHECK(SR_signum);
3276 }
3277
3278 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3279
3280 static os_sigaction_t os_sigaction = NULL;
3281
3282 void os::Aix::check_signal_handler(int sig) {
3283 char buf[O_BUFLEN];
3284 address jvmHandler = NULL;
3285
3286 struct sigaction act;
3287 if (os_sigaction == NULL) {
3288 // only trust the default sigaction, in case it has been interposed
3289 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3290 if (os_sigaction == NULL) return;
3291 }
3292
3293 os_sigaction(sig, (struct sigaction*)NULL, &act);
3294
3295 address thisHandler = (act.sa_flags & SA_SIGINFO)
3296 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3297 : CAST_FROM_FN_PTR(address, act.sa_handler);
3298
3299 switch(sig) {
3300 case SIGSEGV:
3301 case SIGBUS:
3302 case SIGFPE:
3303 case SIGPIPE:
3304 case SIGILL:
3305 case SIGXFSZ:
3306 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3307 break;
3308
3309 case SHUTDOWN1_SIGNAL:
3310 case SHUTDOWN2_SIGNAL:
3311 case SHUTDOWN3_SIGNAL:
3312 case BREAK_SIGNAL:
3313 jvmHandler = (address)user_handler();
3314 break;
3315
3316 default:
3317 if (sig == SR_signum) {
3318 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3319 } else {
3320 return;
3321 }
3322 break;
3323 }
3324
3325 if (thisHandler != jvmHandler) {
3326 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3327 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3328 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3329 // No need to check this sig any longer
3330 sigaddset(&check_signal_done, sig);
3331 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3332 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3333 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3334 exception_name(sig, buf, O_BUFLEN));
3335 }
3336 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3337 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3338 tty->print("expected:");
3339 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3340 tty->cr();
3341 tty->print(" found:");
3342 os::Posix::print_sa_flags(tty, act.sa_flags);
3343 tty->cr();
3344 // No need to check this sig any longer
3345 sigaddset(&check_signal_done, sig);
3346 }
3347
3348 // Dump all the signal
3349 if (sigismember(&check_signal_done, sig)) {
3350 print_signal_handlers(tty, buf, O_BUFLEN);
3351 }
3352 }
3353
3354 // To install functions for atexit system call
3355 extern "C" {
3356 static void perfMemory_exit_helper() {
3357 perfMemory_exit();
3358 }
3359 }
3360
3361 // This is called _before_ the most of global arguments have been parsed.
3362 void os::init(void) {
3363 // This is basic, we want to know if that ever changes.
3364 // (Shared memory boundary is supposed to be a 256M aligned.)
3365 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3366
3367 // Record process break at startup.
3368 g_brk_at_startup = (address) ::sbrk(0);
3369 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3370
3371 // First off, we need to know whether we run on AIX or PASE, and
3372 // the OS level we run on.
3373 os::Aix::initialize_os_info();
3374
3375 // Scan environment (SPEC1170 behaviour, etc).
3376 os::Aix::scan_environment();
3377
3378 // Probe multipage support.
3379 query_multipage_support();
3380
3381 // Act like we only have one page size by eliminating corner cases which
3382 // we did not support very well anyway.
3383 // We have two input conditions:
3384 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3385 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3386 // setting.
3387 // Data segment page size is important for us because it defines the thread stack page
3388 // size, which is needed for guard page handling, stack banging etc.
3389 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3390 // and should be allocated with 64k pages.
3391 //
3392 // So, we do the following:
3393 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3394 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3395 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3396 // 64k no --- AIX 5.2 ? ---
3397 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3398
3399 // We explicitly leave no option to change page size, because only upgrading would work,
3400 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3401
3402 if (g_multipage_support.datapsize == 4*K) {
3403 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3404 if (g_multipage_support.can_use_64K_pages) {
3405 // .. but we are able to use 64K pages dynamically.
3406 // This would be typical for java launchers which are not linked
3407 // with datapsize=64K (like, any other launcher but our own).
3408 //
3409 // In this case it would be smart to allocate the java heap with 64K
3410 // to get the performance benefit, and to fake 64k pages for the
3411 // data segment (when dealing with thread stacks).
3412 //
3413 // However, leave a possibility to downgrade to 4K, using
3414 // -XX:-Use64KPages.
3415 if (Use64KPages) {
3416 trcVerbose("64K page mode (faked for data segment)");
3417 Aix::_page_size = 64*K;
3418 } else {
3419 trcVerbose("4K page mode (Use64KPages=off)");
3420 Aix::_page_size = 4*K;
3421 }
3422 } else {
3423 // .. and not able to allocate 64k pages dynamically. Here, just
3424 // fall back to 4K paged mode and use mmap for everything.
3425 trcVerbose("4K page mode");
3426 Aix::_page_size = 4*K;
3427 FLAG_SET_ERGO(bool, Use64KPages, false);
3428 }
3429 } else {
3430 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3431 // This normally means that we can allocate 64k pages dynamically.
3432 // (There is one special case where this may be false: EXTSHM=on.
3433 // but we decided to not support that mode).
3434 assert0(g_multipage_support.can_use_64K_pages);
3435 Aix::_page_size = 64*K;
3436 trcVerbose("64K page mode");
3437 FLAG_SET_ERGO(bool, Use64KPages, true);
3438 }
3439
3440 // For now UseLargePages is just ignored.
3441 FLAG_SET_ERGO(bool, UseLargePages, false);
3442 _page_sizes[0] = 0;
3443
3444 // debug trace
3445 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3446
3447 // Next, we need to initialize libo4 and libperfstat libraries.
3448 if (os::Aix::on_pase()) {
3449 os::Aix::initialize_libo4();
3450 } else {
3451 os::Aix::initialize_libperfstat();
3452 }
3453
3454 // Reset the perfstat information provided by ODM.
3455 if (os::Aix::on_aix()) {
3456 libperfstat::perfstat_reset();
3457 }
3458
3459 // Now initialze basic system properties. Note that for some of the values we
3460 // need libperfstat etc.
3461 os::Aix::initialize_system_info();
3462
3463 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3464
3465 init_random(1234567);
3466
3467 // _main_thread points to the thread that created/loaded the JVM.
3468 Aix::_main_thread = pthread_self();
3469
3470 initial_time_count = os::elapsed_counter();
3471
3472 os::Posix::init();
3473 }
3474
3475 // This is called _after_ the global arguments have been parsed.
3476 jint os::init_2(void) {
3477
3478 os::Posix::init_2();
3479
3480 if (os::Aix::on_pase()) {
3481 trcVerbose("Running on PASE.");
3482 } else {
3483 trcVerbose("Running on AIX (not PASE).");
3484 }
3485
3486 trcVerbose("processor count: %d", os::_processor_count);
3487 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3488
3489 // Initially build up the loaded dll map.
3490 LoadedLibraries::reload();
3491 if (Verbose) {
3492 trcVerbose("Loaded Libraries: ");
3493 LoadedLibraries::print(tty);
3494 }
3495
3496 // initialize suspend/resume support - must do this before signal_sets_init()
3497 if (SR_initialize() != 0) {
3498 perror("SR_initialize failed");
3499 return JNI_ERR;
3500 }
3501
3502 Aix::signal_sets_init();
3503 Aix::install_signal_handlers();
3504
3505 // Check and sets minimum stack sizes against command line options
3506 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3507 return JNI_ERR;
3508 }
3509
3510 if (UseNUMA) {
3511 UseNUMA = false;
3512 warning("NUMA optimizations are not available on this OS.");
3513 }
3514
3515 if (MaxFDLimit) {
3516 // Set the number of file descriptors to max. print out error
3517 // if getrlimit/setrlimit fails but continue regardless.
3518 struct rlimit nbr_files;
3519 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3520 if (status != 0) {
3521 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3522 } else {
3523 nbr_files.rlim_cur = nbr_files.rlim_max;
3524 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3525 if (status != 0) {
3526 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3527 }
3528 }
3529 }
3530
3531 if (PerfAllowAtExitRegistration) {
3532 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3533 // At exit functions can be delayed until process exit time, which
3534 // can be problematic for embedded VM situations. Embedded VMs should
3535 // call DestroyJavaVM() to assure that VM resources are released.
3536
3537 // Note: perfMemory_exit_helper atexit function may be removed in
3538 // the future if the appropriate cleanup code can be added to the
3539 // VM_Exit VMOperation's doit method.
3540 if (atexit(perfMemory_exit_helper) != 0) {
3541 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3542 }
3543 }
3544
3545 return JNI_OK;
3546 }
3547
3548 // Mark the polling page as unreadable
3549 void os::make_polling_page_unreadable(void) {
3550 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3551 fatal("Could not disable polling page");
3552 }
3553 };
3554
3555 // Mark the polling page as readable
3556 void os::make_polling_page_readable(void) {
3557 // Changed according to os_linux.cpp.
3558 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3559 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3560 }
3561 };
3562
3563 int os::active_processor_count() {
3564 // User has overridden the number of active processors
3565 if (ActiveProcessorCount > 0) {
3566 log_trace(os)("active_processor_count: "
3567 "active processor count set by user : %d",
3568 ActiveProcessorCount);
3569 return ActiveProcessorCount;
3570 }
3571
3572 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3573 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3574 return online_cpus;
3575 }
3576
3577 void os::set_native_thread_name(const char *name) {
3578 // Not yet implemented.
3579 return;
3580 }
3581
3582 bool os::distribute_processes(uint length, uint* distribution) {
3583 // Not yet implemented.
3584 return false;
3585 }
3586
3587 bool os::bind_to_processor(uint processor_id) {
3588 // Not yet implemented.
3589 return false;
3590 }
3591
3592 void os::SuspendedThreadTask::internal_do_task() {
3593 if (do_suspend(_thread->osthread())) {
3594 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3595 do_task(context);
3596 do_resume(_thread->osthread());
3597 }
3598 }
3599
3600 ////////////////////////////////////////////////////////////////////////////////
3601 // debug support
3602
3603 bool os::find(address addr, outputStream* st) {
3604
3605 st->print(PTR_FORMAT ": ", addr);
3606
3607 loaded_module_t lm;
3608 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3609 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3610 st->print_cr("%s", lm.path);
3611 return true;
3612 }
3613
3614 return false;
3615 }
3616
3617 ////////////////////////////////////////////////////////////////////////////////
3618 // misc
3619
3620 // This does not do anything on Aix. This is basically a hook for being
3621 // able to use structured exception handling (thread-local exception filters)
3622 // on, e.g., Win32.
3623 void
3624 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3625 JavaCallArguments* args, Thread* thread) {
3626 f(value, method, args, thread);
3627 }
3628
3629 void os::print_statistics() {
3630 }
3631
3632 bool os::message_box(const char* title, const char* message) {
3633 int i;
3634 fdStream err(defaultStream::error_fd());
3635 for (i = 0; i < 78; i++) err.print_raw("=");
3636 err.cr();
3637 err.print_raw_cr(title);
3638 for (i = 0; i < 78; i++) err.print_raw("-");
3639 err.cr();
3640 err.print_raw_cr(message);
3641 for (i = 0; i < 78; i++) err.print_raw("=");
3642 err.cr();
3643
3644 char buf[16];
3645 // Prevent process from exiting upon "read error" without consuming all CPU
3646 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3647
3648 return buf[0] == 'y' || buf[0] == 'Y';
3649 }
3650
3651 int os::stat(const char *path, struct stat *sbuf) {
3652 char pathbuf[MAX_PATH];
3653 if (strlen(path) > MAX_PATH - 1) {
3654 errno = ENAMETOOLONG;
3655 return -1;
3656 }
3657 os::native_path(strcpy(pathbuf, path));
3658 return ::stat(pathbuf, sbuf);
3659 }
3660
3661 // Is a (classpath) directory empty?
3662 bool os::dir_is_empty(const char* path) {
3663 DIR *dir = NULL;
3664 struct dirent *ptr;
3665
3666 dir = opendir(path);
3667 if (dir == NULL) return true;
3668
3669 /* Scan the directory */
3670 bool result = true;
3671 char buf[sizeof(struct dirent) + MAX_PATH];
3672 while (result && (ptr = ::readdir(dir)) != NULL) {
3673 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3674 result = false;
3675 }
3676 }
3677 closedir(dir);
3678 return result;
3679 }
3680
3681 // This code originates from JDK's sysOpen and open64_w
3682 // from src/solaris/hpi/src/system_md.c
3683
3684 int os::open(const char *path, int oflag, int mode) {
3685
3686 if (strlen(path) > MAX_PATH - 1) {
3687 errno = ENAMETOOLONG;
3688 return -1;
3689 }
3690 int fd;
3691
3692 fd = ::open64(path, oflag, mode);
3693 if (fd == -1) return -1;
3694
3695 // If the open succeeded, the file might still be a directory.
3696 {
3697 struct stat64 buf64;
3698 int ret = ::fstat64(fd, &buf64);
3699 int st_mode = buf64.st_mode;
3700
3701 if (ret != -1) {
3702 if ((st_mode & S_IFMT) == S_IFDIR) {
3703 errno = EISDIR;
3704 ::close(fd);
3705 return -1;
3706 }
3707 } else {
3708 ::close(fd);
3709 return -1;
3710 }
3711 }
3712
3713 // All file descriptors that are opened in the JVM and not
3714 // specifically destined for a subprocess should have the
3715 // close-on-exec flag set. If we don't set it, then careless 3rd
3716 // party native code might fork and exec without closing all
3717 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3718 // UNIXProcess.c), and this in turn might:
3719 //
3720 // - cause end-of-file to fail to be detected on some file
3721 // descriptors, resulting in mysterious hangs, or
3722 //
3723 // - might cause an fopen in the subprocess to fail on a system
3724 // suffering from bug 1085341.
3725 //
3726 // (Yes, the default setting of the close-on-exec flag is a Unix
3727 // design flaw.)
3728 //
3729 // See:
3730 // 1085341: 32-bit stdio routines should support file descriptors >255
3731 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3732 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3733 #ifdef FD_CLOEXEC
3734 {
3735 int flags = ::fcntl(fd, F_GETFD);
3736 if (flags != -1)
3737 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3738 }
3739 #endif
3740
3741 return fd;
3742 }
3743
3744 // create binary file, rewriting existing file if required
3745 int os::create_binary_file(const char* path, bool rewrite_existing) {
3746 int oflags = O_WRONLY | O_CREAT;
3747 if (!rewrite_existing) {
3748 oflags |= O_EXCL;
3749 }
3750 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3751 }
3752
3753 // return current position of file pointer
3754 jlong os::current_file_offset(int fd) {
3755 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3756 }
3757
3758 // move file pointer to the specified offset
3759 jlong os::seek_to_file_offset(int fd, jlong offset) {
3760 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3761 }
3762
3763 // This code originates from JDK's sysAvailable
3764 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3765
3766 int os::available(int fd, jlong *bytes) {
3767 jlong cur, end;
3768 int mode;
3769 struct stat64 buf64;
3770
3771 if (::fstat64(fd, &buf64) >= 0) {
3772 mode = buf64.st_mode;
3773 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3774 int n;
3775 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3776 *bytes = n;
3777 return 1;
3778 }
3779 }
3780 }
3781 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3782 return 0;
3783 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3784 return 0;
3785 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3786 return 0;
3787 }
3788 *bytes = end - cur;
3789 return 1;
3790 }
3791
3792 // Map a block of memory.
3793 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3794 char *addr, size_t bytes, bool read_only,
3795 bool allow_exec) {
3796 int prot;
3797 int flags = MAP_PRIVATE;
3798
3799 if (read_only) {
3800 prot = PROT_READ;
3801 flags = MAP_SHARED;
3802 } else {
3803 prot = PROT_READ | PROT_WRITE;
3804 flags = MAP_PRIVATE;
3805 }
3806
3807 if (allow_exec) {
3808 prot |= PROT_EXEC;
3809 }
3810
3811 if (addr != NULL) {
3812 flags |= MAP_FIXED;
3813 }
3814
3815 // Allow anonymous mappings if 'fd' is -1.
3816 if (fd == -1) {
3817 flags |= MAP_ANONYMOUS;
3818 }
3819
3820 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3821 fd, file_offset);
3822 if (mapped_address == MAP_FAILED) {
3823 return NULL;
3824 }
3825 return mapped_address;
3826 }
3827
3828 // Remap a block of memory.
3829 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3830 char *addr, size_t bytes, bool read_only,
3831 bool allow_exec) {
3832 // same as map_memory() on this OS
3833 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3834 allow_exec);
3835 }
3836
3837 // Unmap a block of memory.
3838 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3839 return munmap(addr, bytes) == 0;
3840 }
3841
3842 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3843 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3844 // of a thread.
3845 //
3846 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3847 // the fast estimate available on the platform.
3848
3849 jlong os::current_thread_cpu_time() {
3850 // return user + sys since the cost is the same
3851 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3852 assert(n >= 0, "negative CPU time");
3853 return n;
3854 }
3855
3856 jlong os::thread_cpu_time(Thread* thread) {
3857 // consistent with what current_thread_cpu_time() returns
3858 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3859 assert(n >= 0, "negative CPU time");
3860 return n;
3861 }
3862
3863 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3864 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3865 assert(n >= 0, "negative CPU time");
3866 return n;
3867 }
3868
3869 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3870 bool error = false;
3871
3872 jlong sys_time = 0;
3873 jlong user_time = 0;
3874
3875 // Reimplemented using getthrds64().
3876 //
3877 // Works like this:
3878 // For the thread in question, get the kernel thread id. Then get the
3879 // kernel thread statistics using that id.
3880 //
3881 // This only works of course when no pthread scheduling is used,
3882 // i.e. there is a 1:1 relationship to kernel threads.
3883 // On AIX, see AIXTHREAD_SCOPE variable.
3884
3885 pthread_t pthtid = thread->osthread()->pthread_id();
3886
3887 // retrieve kernel thread id for the pthread:
3888 tid64_t tid = 0;
3889 struct __pthrdsinfo pinfo;
3890 // I just love those otherworldly IBM APIs which force me to hand down
3891 // dummy buffers for stuff I dont care for...
3892 char dummy[1];
3893 int dummy_size = sizeof(dummy);
3894 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3895 dummy, &dummy_size) == 0) {
3896 tid = pinfo.__pi_tid;
3897 } else {
3898 tty->print_cr("pthread_getthrds_np failed.");
3899 error = true;
3900 }
3901
3902 // retrieve kernel timing info for that kernel thread
3903 if (!error) {
3904 struct thrdentry64 thrdentry;
3905 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3906 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3907 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3908 } else {
3909 tty->print_cr("pthread_getthrds_np failed.");
3910 error = true;
3911 }
3912 }
3913
3914 if (p_sys_time) {
3915 *p_sys_time = sys_time;
3916 }
3917
3918 if (p_user_time) {
3919 *p_user_time = user_time;
3920 }
3921
3922 if (error) {
3923 return false;
3924 }
3925
3926 return true;
3927 }
3928
3929 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3930 jlong sys_time;
3931 jlong user_time;
3932
3933 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3934 return -1;
3935 }
3936
3937 return user_sys_cpu_time ? sys_time + user_time : user_time;
3938 }
3939
3940 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3941 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3942 info_ptr->may_skip_backward = false; // elapsed time not wall time
3943 info_ptr->may_skip_forward = false; // elapsed time not wall time
3944 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3945 }
3946
3947 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3948 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3949 info_ptr->may_skip_backward = false; // elapsed time not wall time
3950 info_ptr->may_skip_forward = false; // elapsed time not wall time
3951 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3952 }
3953
3954 bool os::is_thread_cpu_time_supported() {
3955 return true;
3956 }
3957
3958 // System loadavg support. Returns -1 if load average cannot be obtained.
3959 // For now just return the system wide load average (no processor sets).
3960 int os::loadavg(double values[], int nelem) {
3961
3962 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3963 guarantee(values, "argument error");
3964
3965 if (os::Aix::on_pase()) {
3966
3967 // AS/400 PASE: use libo4 porting library
3968 double v[3] = { 0.0, 0.0, 0.0 };
3969
3970 if (libo4::get_load_avg(v, v + 1, v + 2)) {
3971 for (int i = 0; i < nelem; i ++) {
3972 values[i] = v[i];
3973 }
3974 return nelem;
3975 } else {
3976 return -1;
3977 }
3978
3979 } else {
3980
3981 // AIX: use libperfstat
3982 libperfstat::cpuinfo_t ci;
3983 if (libperfstat::get_cpuinfo(&ci)) {
3984 for (int i = 0; i < nelem; i++) {
3985 values[i] = ci.loadavg[i];
3986 }
3987 } else {
3988 return -1;
3989 }
3990 return nelem;
3991 }
3992 }
3993
3994 void os::pause() {
3995 char filename[MAX_PATH];
3996 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3997 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3998 } else {
3999 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4000 }
4001
4002 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4003 if (fd != -1) {
4004 struct stat buf;
4005 ::close(fd);
4006 while (::stat(filename, &buf) == 0) {
4007 (void)::poll(NULL, 0, 100);
4008 }
4009 } else {
4010 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4011 }
4012 }
4013
4014 bool os::is_primordial_thread(void) {
4015 if (pthread_self() == (pthread_t)1) {
4016 return true;
4017 } else {
4018 return false;
4019 }
4020 }
4021
4022 // OS recognitions (PASE/AIX, OS level) call this before calling any
4023 // one of Aix::on_pase(), Aix::os_version() static
4024 void os::Aix::initialize_os_info() {
4025
4026 assert(_on_pase == -1 && _os_version == 0, "already called.");
4027
4028 struct utsname uts;
4029 memset(&uts, 0, sizeof(uts));
4030 strcpy(uts.sysname, "?");
4031 if (::uname(&uts) == -1) {
4032 trcVerbose("uname failed (%d)", errno);
4033 guarantee(0, "Could not determine whether we run on AIX or PASE");
4034 } else {
4035 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4036 "node \"%s\" machine \"%s\"\n",
4037 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4038 const int major = atoi(uts.version);
4039 assert(major > 0, "invalid OS version");
4040 const int minor = atoi(uts.release);
4041 assert(minor > 0, "invalid OS release");
4042 _os_version = (major << 24) | (minor << 16);
4043 char ver_str[20] = {0};
4044 char *name_str = "unknown OS";
4045 if (strcmp(uts.sysname, "OS400") == 0) {
4046 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4047 _on_pase = 1;
4048 if (os_version_short() < 0x0504) {
4049 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4050 assert(false, "OS/400 release too old.");
4051 }
4052 name_str = "OS/400 (pase)";
4053 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4054 } else if (strcmp(uts.sysname, "AIX") == 0) {
4055 // We run on AIX. We do not support versions older than AIX 5.3.
4056 _on_pase = 0;
4057 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4058 odmWrapper::determine_os_kernel_version(&_os_version);
4059 if (os_version_short() < 0x0503) {
4060 trcVerbose("AIX release older than AIX 5.3 not supported.");
4061 assert(false, "AIX release too old.");
4062 }
4063 name_str = "AIX";
4064 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4065 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4066 } else {
4067 assert(false, name_str);
4068 }
4069 trcVerbose("We run on %s %s", name_str, ver_str);
4070 }
4071
4072 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4073 } // end: os::Aix::initialize_os_info()
4074
4075 // Scan environment for important settings which might effect the VM.
4076 // Trace out settings. Warn about invalid settings and/or correct them.
4077 //
4078 // Must run after os::Aix::initialue_os_info().
4079 void os::Aix::scan_environment() {
4080
4081 char* p;
4082 int rc;
4083
4084 // Warn explicity if EXTSHM=ON is used. That switch changes how
4085 // System V shared memory behaves. One effect is that page size of
4086 // shared memory cannot be change dynamically, effectivly preventing
4087 // large pages from working.
4088 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4089 // recommendation is (in OSS notes) to switch it off.
4090 p = ::getenv("EXTSHM");
4091 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4092 if (p && strcasecmp(p, "ON") == 0) {
4093 _extshm = 1;
4094 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4095 if (!AllowExtshm) {
4096 // We allow under certain conditions the user to continue. However, we want this
4097 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4098 // that the VM is not able to allocate 64k pages for the heap.
4099 // We do not want to run with reduced performance.
4100 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4101 }
4102 } else {
4103 _extshm = 0;
4104 }
4105
4106 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4107 // Not tested, not supported.
4108 //
4109 // Note that it might be worth the trouble to test and to require it, if only to
4110 // get useful return codes for mprotect.
4111 //
4112 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4113 // exec() ? before loading the libjvm ? ....)
4114 p = ::getenv("XPG_SUS_ENV");
4115 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4116 if (p && strcmp(p, "ON") == 0) {
4117 _xpg_sus_mode = 1;
4118 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4119 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4120 // clobber address ranges. If we ever want to support that, we have to do some
4121 // testing first.
4122 guarantee(false, "XPG_SUS_ENV=ON not supported");
4123 } else {
4124 _xpg_sus_mode = 0;
4125 }
4126
4127 if (os::Aix::on_pase()) {
4128 p = ::getenv("QIBM_MULTI_THREADED");
4129 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4130 }
4131
4132 p = ::getenv("LDR_CNTRL");
4133 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4134 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4135 if (p && ::strstr(p, "TEXTPSIZE")) {
4136 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4137 "you may experience hangs or crashes on OS/400 V7R1.");
4138 }
4139 }
4140
4141 p = ::getenv("AIXTHREAD_GUARDPAGES");
4142 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4143
4144 } // end: os::Aix::scan_environment()
4145
4146 // PASE: initialize the libo4 library (PASE porting library).
4147 void os::Aix::initialize_libo4() {
4148 guarantee(os::Aix::on_pase(), "OS/400 only.");
4149 if (!libo4::init()) {
4150 trcVerbose("libo4 initialization failed.");
4151 assert(false, "libo4 initialization failed");
4152 } else {
4153 trcVerbose("libo4 initialized.");
4154 }
4155 }
4156
4157 // AIX: initialize the libperfstat library.
4158 void os::Aix::initialize_libperfstat() {
4159 assert(os::Aix::on_aix(), "AIX only");
4160 if (!libperfstat::init()) {
4161 trcVerbose("libperfstat initialization failed.");
4162 assert(false, "libperfstat initialization failed");
4163 } else {
4164 trcVerbose("libperfstat initialized.");
4165 }
4166 }
4167
4168 /////////////////////////////////////////////////////////////////////////////
4169 // thread stack
4170
4171 // Get the current stack base from the OS (actually, the pthread library).
4172 // Note: usually not page aligned.
4173 address os::current_stack_base() {
4174 AixMisc::stackbounds_t bounds;
4175 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4176 guarantee(rc, "Unable to retrieve stack bounds.");
4177 return bounds.base;
4178 }
4179
4180 // Get the current stack size from the OS (actually, the pthread library).
4181 // Returned size is such that (base - size) is always aligned to page size.
4182 size_t os::current_stack_size() {
4183 AixMisc::stackbounds_t bounds;
4184 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4185 guarantee(rc, "Unable to retrieve stack bounds.");
4186 // Align the returned stack size such that the stack low address
4187 // is aligned to page size (Note: base is usually not and we do not care).
4188 // We need to do this because caller code will assume stack low address is
4189 // page aligned and will place guard pages without checking.
4190 address low = bounds.base - bounds.size;
4191 address low_aligned = (address)align_up(low, os::vm_page_size());
4192 size_t s = bounds.base - low_aligned;
4193 return s;
4194 }
4195
4196 extern char** environ;
4197
4198 // Run the specified command in a separate process. Return its exit value,
4199 // or -1 on failure (e.g. can't fork a new process).
4200 // Unlike system(), this function can be called from signal handler. It
4201 // doesn't block SIGINT et al.
4202 int os::fork_and_exec(char* cmd) {
4203 char * argv[4] = {"sh", "-c", cmd, NULL};
4204
4205 pid_t pid = fork();
4206
4207 if (pid < 0) {
4208 // fork failed
4209 return -1;
4210
4211 } else if (pid == 0) {
4212 // child process
4213
4214 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4215 execve("/usr/bin/sh", argv, environ);
4216
4217 // execve failed
4218 _exit(-1);
4219
4220 } else {
4221 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4222 // care about the actual exit code, for now.
4223
4224 int status;
4225
4226 // Wait for the child process to exit. This returns immediately if
4227 // the child has already exited. */
4228 while (waitpid(pid, &status, 0) < 0) {
4229 switch (errno) {
4230 case ECHILD: return 0;
4231 case EINTR: break;
4232 default: return -1;
4233 }
4234 }
4235
4236 if (WIFEXITED(status)) {
4237 // The child exited normally; get its exit code.
4238 return WEXITSTATUS(status);
4239 } else if (WIFSIGNALED(status)) {
4240 // The child exited because of a signal.
4241 // The best value to return is 0x80 + signal number,
4242 // because that is what all Unix shells do, and because
4243 // it allows callers to distinguish between process exit and
4244 // process death by signal.
4245 return 0x80 + WTERMSIG(status);
4246 } else {
4247 // Unknown exit code; pass it through.
4248 return status;
4249 }
4250 }
4251 return -1;
4252 }
4253
4254 // is_headless_jre()
4255 //
4256 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4257 // in order to report if we are running in a headless jre.
4258 //
4259 // Since JDK8 xawt/libmawt.so is moved into the same directory
4260 // as libawt.so, and renamed libawt_xawt.so
4261 bool os::is_headless_jre() {
4262 struct stat statbuf;
4263 char buf[MAXPATHLEN];
4264 char libmawtpath[MAXPATHLEN];
4265 const char *xawtstr = "/xawt/libmawt.so";
4266 const char *new_xawtstr = "/libawt_xawt.so";
4267
4268 char *p;
4269
4270 // Get path to libjvm.so
4271 os::jvm_path(buf, sizeof(buf));
4272
4273 // Get rid of libjvm.so
4274 p = strrchr(buf, '/');
4275 if (p == NULL) return false;
4276 else *p = '\0';
4277
4278 // Get rid of client or server
4279 p = strrchr(buf, '/');
4280 if (p == NULL) return false;
4281 else *p = '\0';
4282
4283 // check xawt/libmawt.so
4284 strcpy(libmawtpath, buf);
4285 strcat(libmawtpath, xawtstr);
4286 if (::stat(libmawtpath, &statbuf) == 0) return false;
4287
4288 // check libawt_xawt.so
4289 strcpy(libmawtpath, buf);
4290 strcat(libmawtpath, new_xawtstr);
4291 if (::stat(libmawtpath, &statbuf) == 0) return false;
4292
4293 return true;
4294 }
4295
4296 // Get the default path to the core file
4297 // Returns the length of the string
4298 int os::get_core_path(char* buffer, size_t bufferSize) {
4299 const char* p = get_current_directory(buffer, bufferSize);
4300
4301 if (p == NULL) {
4302 assert(p != NULL, "failed to get current directory");
4303 return 0;
4304 }
4305
4306 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4307 p, current_process_id());
4308
4309 return strlen(buffer);
4310 }
4311
4312 #ifndef PRODUCT
4313 void TestReserveMemorySpecial_test() {
4314 // No tests available for this platform
4315 }
4316 #endif
4317
4318 bool os::start_debugging(char *buf, int buflen) {
4319 int len = (int)strlen(buf);
4320 char *p = &buf[len];
4321
4322 jio_snprintf(p, buflen -len,
4323 "\n\n"
4324 "Do you want to debug the problem?\n\n"
4325 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4326 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4327 "Otherwise, press RETURN to abort...",
4328 os::current_process_id(),
4329 os::current_thread_id(), thread_self());
4330
4331 bool yes = os::message_box("Unexpected Error", buf);
4332
4333 if (yes) {
4334 // yes, user asked VM to launch debugger
4335 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4336
4337 os::fork_and_exec(buf);
4338 yes = false;
4339 }
4340 return yes;
4341 }
4342
4343 static inline time_t get_mtime(const char* filename) {
4344 struct stat st;
4345 int ret = os::stat(filename, &st);
4346 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4347 return st.st_mtime;
4348 }
4349
4350 int os::compare_file_modified_times(const char* file1, const char* file2) {
4351 time_t t1 = get_mtime(file1);
4352 time_t t2 = get_mtime(file2);
4353 return t1 - t2;
4354 }