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 "classfile/classLoader.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/icBuffer.hpp"
35 #include "code/vtableStubs.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "jvm_aix.h"
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.h"
53 #include "prims/jvm_misc.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/extendedPC.hpp"
57 #include "runtime/globals.hpp"
58 #include "runtime/interfaceSupport.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/mutexLocker.hpp"
62 #include "runtime/objectMonitor.hpp"
63 #include "runtime/orderAccess.inline.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/osThread.hpp"
66 #include "runtime/perfMemory.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/statSampler.hpp"
69 #include "runtime/stubRoutines.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadCritical.hpp"
72 #include "runtime/timer.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "services/attachListener.hpp"
75 #include "services/runtimeService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/decoder.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/growableArray.hpp"
81 #include "utilities/vmError.hpp"
82
83 // put OS-includes here (sorted alphabetically)
84 #include <errno.h>
85 #include <fcntl.h>
86 #include <inttypes.h>
87 #include <poll.h>
88 #include <procinfo.h>
89 #include <pthread.h>
90 #include <pwd.h>
91 #include <semaphore.h>
92 #include <signal.h>
93 #include <stdint.h>
94 #include <stdio.h>
95 #include <string.h>
96 #include <unistd.h>
97 #include <sys/ioctl.h>
98 #include <sys/ipc.h>
99 #include <sys/mman.h>
100 #include <sys/resource.h>
101 #include <sys/select.h>
102 #include <sys/shm.h>
103 #include <sys/socket.h>
104 #include <sys/stat.h>
105 #include <sys/sysinfo.h>
106 #include <sys/systemcfg.h>
107 #include <sys/time.h>
108 #include <sys/times.h>
109 #include <sys/types.h>
110 #include <sys/utsname.h>
111 #include <sys/vminfo.h>
112 #include <sys/wait.h>
113
114 // Missing prototypes for various system APIs.
115 extern "C"
116 int mread_real_time(timebasestruct_t *t, size_t size_of_timebasestruct_t);
117
118 #if !defined(_AIXVERSION_610)
119 extern "C" int getthrds64(pid_t, struct thrdentry64*, int, tid64_t*, int);
120 extern "C" int getprocs64(procentry64*, int, fdsinfo*, int, pid_t*, int);
121 extern "C" int getargs (procsinfo*, int, char*, int);
122 #endif
123
124 #define MAX_PATH (2 * K)
125
126 // for timer info max values which include all bits
127 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
128 // for multipage initialization error analysis (in 'g_multipage_error')
129 #define ERROR_MP_OS_TOO_OLD 100
130 #define ERROR_MP_EXTSHM_ACTIVE 101
131 #define ERROR_MP_VMGETINFO_FAILED 102
132 #define ERROR_MP_VMGETINFO_CLAIMS_NO_SUPPORT_FOR_64K 103
133
134 static address resolve_function_descriptor_to_code_pointer(address p);
135
136 static void vmembk_print_on(outputStream* os);
137
138 ////////////////////////////////////////////////////////////////////////////////
139 // global variables (for a description see os_aix.hpp)
140
141 julong os::Aix::_physical_memory = 0;
142
143 pthread_t os::Aix::_main_thread = ((pthread_t)0);
144 int os::Aix::_page_size = -1;
145
146 // -1 = uninitialized, 0 if AIX, 1 if OS/400 pase
147 int os::Aix::_on_pase = -1;
148
149 // 0 = uninitialized, otherwise 32 bit number:
150 // 0xVVRRTTSS
151 // VV - major version
152 // RR - minor version
153 // TT - tech level, if known, 0 otherwise
154 // SS - service pack, if known, 0 otherwise
155 uint32_t os::Aix::_os_version = 0;
156
157 // -1 = uninitialized, 0 - no, 1 - yes
158 int os::Aix::_xpg_sus_mode = -1;
159
160 // -1 = uninitialized, 0 - no, 1 - yes
161 int os::Aix::_extshm = -1;
162
163 ////////////////////////////////////////////////////////////////////////////////
164 // local variables
165
166 static jlong initial_time_count = 0;
167 static int clock_tics_per_sec = 100;
168 static sigset_t check_signal_done; // For diagnostics to print a message once (see run_periodic_checks)
169 static bool check_signals = true;
170 static int SR_signum = SIGUSR2; // Signal used to suspend/resume a thread (must be > SIGSEGV, see 4355769)
171 static sigset_t SR_sigset;
172
173 // Process break recorded at startup.
174 static address g_brk_at_startup = NULL;
175
176 // This describes the state of multipage support of the underlying
177 // OS. Note that this is of no interest to the outsize world and
178 // therefore should not be defined in AIX class.
179 //
180 // AIX supports four different page sizes - 4K, 64K, 16MB, 16GB. The
181 // latter two (16M "large" resp. 16G "huge" pages) require special
182 // setup and are normally not available.
183 //
184 // AIX supports multiple page sizes per process, for:
185 // - Stack (of the primordial thread, so not relevant for us)
186 // - Data - data, bss, heap, for us also pthread stacks
187 // - Text - text code
188 // - shared memory
189 //
190 // Default page sizes can be set via linker options (-bdatapsize, -bstacksize, ...)
191 // and via environment variable LDR_CNTRL (DATAPSIZE, STACKPSIZE, ...).
192 //
193 // For shared memory, page size can be set dynamically via
194 // shmctl(). Different shared memory regions can have different page
195 // sizes.
196 //
197 // More information can be found at AIBM info center:
198 // http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/multiple_page_size_app_support.htm
199 //
200 static struct {
201 size_t pagesize; // sysconf _SC_PAGESIZE (4K)
202 size_t datapsize; // default data page size (LDR_CNTRL DATAPSIZE)
203 size_t shmpsize; // default shared memory page size (LDR_CNTRL SHMPSIZE)
204 size_t pthr_stack_pagesize; // stack page size of pthread threads
205 size_t textpsize; // default text page size (LDR_CNTRL STACKPSIZE)
206 bool can_use_64K_pages; // True if we can alloc 64K pages dynamically with Sys V shm.
207 bool can_use_16M_pages; // True if we can alloc 16M pages dynamically with Sys V shm.
208 int error; // Error describing if something went wrong at multipage init.
209 } g_multipage_support = {
210 (size_t) -1,
211 (size_t) -1,
212 (size_t) -1,
213 (size_t) -1,
214 (size_t) -1,
215 false, false,
216 0
217 };
218
219 // We must not accidentally allocate memory close to the BRK - even if
220 // that would work - because then we prevent the BRK segment from
221 // growing which may result in a malloc OOM even though there is
222 // enough memory. The problem only arises if we shmat() or mmap() at
223 // a specific wish address, e.g. to place the heap in a
224 // compressed-oops-friendly way.
225 static bool is_close_to_brk(address a) {
226 assert0(g_brk_at_startup != NULL);
227 if (a >= g_brk_at_startup &&
228 a < (g_brk_at_startup + MaxExpectedDataSegmentSize)) {
229 return true;
230 }
231 return false;
232 }
233
234 julong os::available_memory() {
235 return Aix::available_memory();
236 }
237
238 julong os::Aix::available_memory() {
239 // Avoid expensive API call here, as returned value will always be null.
240 if (os::Aix::on_pase()) {
241 return 0x0LL;
242 }
243 os::Aix::meminfo_t mi;
244 if (os::Aix::get_meminfo(&mi)) {
245 return mi.real_free;
246 } else {
247 return ULONG_MAX;
248 }
249 }
250
251 julong os::physical_memory() {
252 return Aix::physical_memory();
253 }
254
255 // Return true if user is running as root.
256
257 bool os::have_special_privileges() {
258 static bool init = false;
259 static bool privileges = false;
260 if (!init) {
261 privileges = (getuid() != geteuid()) || (getgid() != getegid());
262 init = true;
263 }
264 return privileges;
265 }
266
267 // Helper function, emulates disclaim64 using multiple 32bit disclaims
268 // because we cannot use disclaim64() on AS/400 and old AIX releases.
269 static bool my_disclaim64(char* addr, size_t size) {
270
271 if (size == 0) {
272 return true;
273 }
274
275 // Maximum size 32bit disclaim() accepts. (Theoretically 4GB, but I just do not trust that.)
276 const unsigned int maxDisclaimSize = 0x40000000;
277
278 const unsigned int numFullDisclaimsNeeded = (size / maxDisclaimSize);
279 const unsigned int lastDisclaimSize = (size % maxDisclaimSize);
280
281 char* p = addr;
282
283 for (int i = 0; i < numFullDisclaimsNeeded; i ++) {
284 if (::disclaim(p, maxDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
285 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + maxDisclaimSize, errno);
286 return false;
287 }
288 p += maxDisclaimSize;
289 }
290
291 if (lastDisclaimSize > 0) {
292 if (::disclaim(p, lastDisclaimSize, DISCLAIM_ZEROMEM) != 0) {
293 trcVerbose("Cannot disclaim %p - %p (errno %d)\n", p, p + lastDisclaimSize, errno);
294 return false;
295 }
296 }
297
298 return true;
299 }
300
301 // Cpu architecture string
302 #if defined(PPC32)
303 static char cpu_arch[] = "ppc";
304 #elif defined(PPC64)
305 static char cpu_arch[] = "ppc64";
306 #else
307 #error Add appropriate cpu_arch setting
308 #endif
309
310 // Wrap the function "vmgetinfo" which is not available on older OS releases.
311 static int checked_vmgetinfo(void *out, int command, int arg) {
312 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
313 guarantee(false, "cannot call vmgetinfo on AS/400 older than V6R1");
314 }
315 return ::vmgetinfo(out, command, arg);
316 }
317
318 // Given an address, returns the size of the page backing that address.
319 size_t os::Aix::query_pagesize(void* addr) {
320
321 if (os::Aix::on_pase() && os::Aix::os_version_short() < 0x0601) {
322 // AS/400 older than V6R1: no vmgetinfo here, default to 4K
323 return 4*K;
324 }
325
326 vm_page_info pi;
327 pi.addr = (uint64_t)addr;
328 if (checked_vmgetinfo(&pi, VM_PAGE_INFO, sizeof(pi)) == 0) {
329 return pi.pagesize;
330 } else {
331 assert(false, "vmgetinfo failed to retrieve page size");
332 return 4*K;
333 }
334 }
335
336 void os::Aix::initialize_system_info() {
337
338 // Get the number of online(logical) cpus instead of configured.
339 os::_processor_count = sysconf(_SC_NPROCESSORS_ONLN);
340 assert(_processor_count > 0, "_processor_count must be > 0");
341
342 // Retrieve total physical storage.
343 os::Aix::meminfo_t mi;
344 if (!os::Aix::get_meminfo(&mi)) {
345 assert(false, "os::Aix::get_meminfo failed.");
346 }
347 _physical_memory = (julong) mi.real_total;
348 }
349
350 // Helper function for tracing page sizes.
351 static const char* describe_pagesize(size_t pagesize) {
352 switch (pagesize) {
353 case 4*K : return "4K";
354 case 64*K: return "64K";
355 case 16*M: return "16M";
356 case 16*G: return "16G";
357 default:
358 assert(false, "surprise");
359 return "??";
360 }
361 }
362
363 // Probe OS for multipage support.
364 // Will fill the global g_multipage_support structure.
365 // Must be called before calling os::large_page_init().
366 static void query_multipage_support() {
367
368 guarantee(g_multipage_support.pagesize == -1,
369 "do not call twice");
370
371 g_multipage_support.pagesize = ::sysconf(_SC_PAGESIZE);
372
373 // This really would surprise me.
374 assert(g_multipage_support.pagesize == 4*K, "surprise!");
375
376 // Query default data page size (default page size for C-Heap, pthread stacks and .bss).
377 // Default data page size is defined either by linker options (-bdatapsize)
378 // or by environment variable LDR_CNTRL (suboption DATAPSIZE). If none is given,
379 // default should be 4K.
380 {
381 void* p = ::malloc(16*M);
382 g_multipage_support.datapsize = os::Aix::query_pagesize(p);
383 ::free(p);
384 }
385
386 // Query default shm page size (LDR_CNTRL SHMPSIZE).
387 // Note that this is pure curiosity. We do not rely on default page size but set
388 // our own page size after allocated.
389 {
390 const int shmid = ::shmget(IPC_PRIVATE, 1, IPC_CREAT | S_IRUSR | S_IWUSR);
391 guarantee(shmid != -1, "shmget failed");
392 void* p = ::shmat(shmid, NULL, 0);
393 ::shmctl(shmid, IPC_RMID, NULL);
394 guarantee(p != (void*) -1, "shmat failed");
395 g_multipage_support.shmpsize = os::Aix::query_pagesize(p);
396 ::shmdt(p);
397 }
398
399 // Before querying the stack page size, make sure we are not running as primordial
400 // thread (because primordial thread's stack may have different page size than
401 // pthread thread stacks). Running a VM on the primordial thread won't work for a
402 // number of reasons so we may just as well guarantee it here.
403 guarantee0(!os::Aix::is_primordial_thread());
404
405 // Query pthread stack page size. Should be the same as data page size because
406 // pthread stacks are allocated from C-Heap.
407 {
408 int dummy = 0;
409 g_multipage_support.pthr_stack_pagesize = os::Aix::query_pagesize(&dummy);
410 }
411
412 // Query default text page size (LDR_CNTRL TEXTPSIZE).
413 {
414 address any_function =
415 resolve_function_descriptor_to_code_pointer((address)describe_pagesize);
416 g_multipage_support.textpsize = os::Aix::query_pagesize(any_function);
417 }
418
419 // Now probe for support of 64K pages and 16M pages.
420
421 // Before OS/400 V6R1, there is no support for pages other than 4K.
422 if (os::Aix::on_pase_V5R4_or_older()) {
423 trcVerbose("OS/400 < V6R1 - no large page support.");
424 g_multipage_support.error = ERROR_MP_OS_TOO_OLD;
425 goto query_multipage_support_end;
426 }
427
428 // Now check which page sizes the OS claims it supports, and of those, which actually can be used.
429 {
430 const int MAX_PAGE_SIZES = 4;
431 psize_t sizes[MAX_PAGE_SIZES];
432 const int num_psizes = checked_vmgetinfo(sizes, VMINFO_GETPSIZES, MAX_PAGE_SIZES);
433 if (num_psizes == -1) {
434 trcVerbose("vmgetinfo(VMINFO_GETPSIZES) failed (errno: %d)", errno);
435 trcVerbose("disabling multipage support.");
436 g_multipage_support.error = ERROR_MP_VMGETINFO_FAILED;
437 goto query_multipage_support_end;
438 }
439 guarantee(num_psizes > 0, "vmgetinfo(.., VMINFO_GETPSIZES, ...) failed.");
440 assert(num_psizes <= MAX_PAGE_SIZES, "Surprise! more than 4 page sizes?");
441 trcVerbose("vmgetinfo(.., VMINFO_GETPSIZES, ...) returns %d supported page sizes: ", num_psizes);
442 for (int i = 0; i < num_psizes; i ++) {
443 trcVerbose(" %s ", describe_pagesize(sizes[i]));
444 }
445
446 // Can we use 64K, 16M pages?
447 for (int i = 0; i < num_psizes; i ++) {
448 const size_t pagesize = sizes[i];
449 if (pagesize != 64*K && pagesize != 16*M) {
450 continue;
451 }
452 bool can_use = false;
453 trcVerbose("Probing support for %s pages...", describe_pagesize(pagesize));
454 const int shmid = ::shmget(IPC_PRIVATE, pagesize,
455 IPC_CREAT | S_IRUSR | S_IWUSR);
456 guarantee0(shmid != -1); // Should always work.
457 // Try to set pagesize.
458 struct shmid_ds shm_buf = { 0 };
459 shm_buf.shm_pagesize = pagesize;
460 if (::shmctl(shmid, SHM_PAGESIZE, &shm_buf) != 0) {
461 const int en = errno;
462 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
463 trcVerbose("shmctl(SHM_PAGESIZE) failed with errno=%n",
464 errno);
465 } else {
466 // Attach and double check pageisze.
467 void* p = ::shmat(shmid, NULL, 0);
468 ::shmctl(shmid, IPC_RMID, NULL); // As early as possible!
469 guarantee0(p != (void*) -1); // Should always work.
470 const size_t real_pagesize = os::Aix::query_pagesize(p);
471 if (real_pagesize != pagesize) {
472 trcVerbose("real page size (0x%llX) differs.", real_pagesize);
473 } else {
474 can_use = true;
475 }
476 ::shmdt(p);
477 }
478 trcVerbose("Can use: %s", (can_use ? "yes" : "no"));
479 if (pagesize == 64*K) {
480 g_multipage_support.can_use_64K_pages = can_use;
481 } else if (pagesize == 16*M) {
482 g_multipage_support.can_use_16M_pages = can_use;
483 }
484 }
485
486 } // end: check which pages can be used for shared memory
487
488 query_multipage_support_end:
489
490 trcVerbose("base page size (sysconf _SC_PAGESIZE): %s",
491 describe_pagesize(g_multipage_support.pagesize));
492 trcVerbose("Data page size (C-Heap, bss, etc): %s",
493 describe_pagesize(g_multipage_support.datapsize));
494 trcVerbose("Text page size: %s",
495 describe_pagesize(g_multipage_support.textpsize));
496 trcVerbose("Thread stack page size (pthread): %s",
497 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
498 trcVerbose("Default shared memory page size: %s",
499 describe_pagesize(g_multipage_support.shmpsize));
500 trcVerbose("Can use 64K pages dynamically with shared meory: %s",
501 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
502 trcVerbose("Can use 16M pages dynamically with shared memory: %s",
503 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
504 trcVerbose("Multipage error details: %d",
505 g_multipage_support.error);
506
507 // sanity checks
508 assert0(g_multipage_support.pagesize == 4*K);
509 assert0(g_multipage_support.datapsize == 4*K || g_multipage_support.datapsize == 64*K);
510 assert0(g_multipage_support.textpsize == 4*K || g_multipage_support.textpsize == 64*K);
511 assert0(g_multipage_support.pthr_stack_pagesize == g_multipage_support.datapsize);
512 assert0(g_multipage_support.shmpsize == 4*K || g_multipage_support.shmpsize == 64*K);
513
514 }
515
516 void os::init_system_properties_values() {
517
518 #define DEFAULT_LIBPATH "/lib:/usr/lib"
519 #define EXTENSIONS_DIR "/lib/ext"
520
521 // Buffer that fits several sprintfs.
522 // Note that the space for the trailing null is provided
523 // by the nulls included by the sizeof operator.
524 const size_t bufsize =
525 MAX2((size_t)MAXPATHLEN, // For dll_dir & friends.
526 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR)); // extensions dir
527 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal);
528
529 // sysclasspath, java_home, dll_dir
530 {
531 char *pslash;
532 os::jvm_path(buf, bufsize);
533
534 // Found the full path to libjvm.so.
535 // Now cut the path to <java_home>/jre if we can.
536 pslash = strrchr(buf, '/');
537 if (pslash != NULL) {
538 *pslash = '\0'; // Get rid of /libjvm.so.
539 }
540 pslash = strrchr(buf, '/');
541 if (pslash != NULL) {
542 *pslash = '\0'; // Get rid of /{client|server|hotspot}.
543 }
544 Arguments::set_dll_dir(buf);
545
546 if (pslash != NULL) {
547 pslash = strrchr(buf, '/');
548 if (pslash != NULL) {
549 *pslash = '\0'; // Get rid of /lib.
550 }
551 }
552 Arguments::set_java_home(buf);
553 set_boot_path('/', ':');
554 }
555
556 // Where to look for native libraries.
557
558 // On Aix we get the user setting of LIBPATH.
559 // Eventually, all the library path setting will be done here.
560 // Get the user setting of LIBPATH.
561 const char *v = ::getenv("LIBPATH");
562 const char *v_colon = ":";
563 if (v == NULL) { v = ""; v_colon = ""; }
564
565 // Concatenate user and invariant part of ld_library_path.
566 // That's +1 for the colon and +1 for the trailing '\0'.
567 char *ld_library_path = (char *)NEW_C_HEAP_ARRAY(char, strlen(v) + 1 + sizeof(DEFAULT_LIBPATH) + 1, mtInternal);
568 sprintf(ld_library_path, "%s%s" DEFAULT_LIBPATH, v, v_colon);
569 Arguments::set_library_path(ld_library_path);
570 FREE_C_HEAP_ARRAY(char, ld_library_path);
571
572 // Extensions directories.
573 sprintf(buf, "%s" EXTENSIONS_DIR, Arguments::get_java_home());
574 Arguments::set_ext_dirs(buf);
575
576 FREE_C_HEAP_ARRAY(char, buf);
577
578 #undef DEFAULT_LIBPATH
579 #undef EXTENSIONS_DIR
580 }
581
582 ////////////////////////////////////////////////////////////////////////////////
583 // breakpoint support
584
585 void os::breakpoint() {
586 BREAKPOINT;
587 }
588
589 extern "C" void breakpoint() {
590 // use debugger to set breakpoint here
591 }
592
593 ////////////////////////////////////////////////////////////////////////////////
594 // signal support
595
596 debug_only(static bool signal_sets_initialized = false);
597 static sigset_t unblocked_sigs, vm_sigs;
598
599 bool os::Aix::is_sig_ignored(int sig) {
600 struct sigaction oact;
601 sigaction(sig, (struct sigaction*)NULL, &oact);
602 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction)
603 : CAST_FROM_FN_PTR(void*, oact.sa_handler);
604 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) {
605 return true;
606 } else {
607 return false;
608 }
609 }
610
611 void os::Aix::signal_sets_init() {
612 // Should also have an assertion stating we are still single-threaded.
613 assert(!signal_sets_initialized, "Already initialized");
614 // Fill in signals that are necessarily unblocked for all threads in
615 // the VM. Currently, we unblock the following signals:
616 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden
617 // by -Xrs (=ReduceSignalUsage));
618 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all
619 // other threads. The "ReduceSignalUsage" boolean tells us not to alter
620 // the dispositions or masks wrt these signals.
621 // Programs embedding the VM that want to use the above signals for their
622 // own purposes must, at this time, use the "-Xrs" option to prevent
623 // interference with shutdown hooks and BREAK_SIGNAL thread dumping.
624 // (See bug 4345157, and other related bugs).
625 // In reality, though, unblocking these signals is really a nop, since
626 // these signals are not blocked by default.
627 sigemptyset(&unblocked_sigs);
628 sigaddset(&unblocked_sigs, SIGILL);
629 sigaddset(&unblocked_sigs, SIGSEGV);
630 sigaddset(&unblocked_sigs, SIGBUS);
631 sigaddset(&unblocked_sigs, SIGFPE);
632 sigaddset(&unblocked_sigs, SIGTRAP);
633 sigaddset(&unblocked_sigs, SR_signum);
634
635 if (!ReduceSignalUsage) {
636 if (!os::Aix::is_sig_ignored(SHUTDOWN1_SIGNAL)) {
637 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL);
638 }
639 if (!os::Aix::is_sig_ignored(SHUTDOWN2_SIGNAL)) {
640 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL);
641 }
642 if (!os::Aix::is_sig_ignored(SHUTDOWN3_SIGNAL)) {
643 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL);
644 }
645 }
646 // Fill in signals that are blocked by all but the VM thread.
647 sigemptyset(&vm_sigs);
648 if (!ReduceSignalUsage)
649 sigaddset(&vm_sigs, BREAK_SIGNAL);
650 debug_only(signal_sets_initialized = true);
651 }
652
653 // These are signals that are unblocked while a thread is running Java.
654 // (For some reason, they get blocked by default.)
655 sigset_t* os::Aix::unblocked_signals() {
656 assert(signal_sets_initialized, "Not initialized");
657 return &unblocked_sigs;
658 }
659
660 // These are the signals that are blocked while a (non-VM) thread is
661 // running Java. Only the VM thread handles these signals.
662 sigset_t* os::Aix::vm_signals() {
663 assert(signal_sets_initialized, "Not initialized");
664 return &vm_sigs;
665 }
666
667 void os::Aix::hotspot_sigmask(Thread* thread) {
668
669 //Save caller's signal mask before setting VM signal mask
670 sigset_t caller_sigmask;
671 pthread_sigmask(SIG_BLOCK, NULL, &caller_sigmask);
672
673 OSThread* osthread = thread->osthread();
674 osthread->set_caller_sigmask(caller_sigmask);
675
676 pthread_sigmask(SIG_UNBLOCK, os::Aix::unblocked_signals(), NULL);
677
678 if (!ReduceSignalUsage) {
679 if (thread->is_VM_thread()) {
680 // Only the VM thread handles BREAK_SIGNAL ...
681 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL);
682 } else {
683 // ... all other threads block BREAK_SIGNAL
684 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL);
685 }
686 }
687 }
688
689 // retrieve memory information.
690 // Returns false if something went wrong;
691 // content of pmi undefined in this case.
692 bool os::Aix::get_meminfo(meminfo_t* pmi) {
693
694 assert(pmi, "get_meminfo: invalid parameter");
695
696 memset(pmi, 0, sizeof(meminfo_t));
697
698 if (os::Aix::on_pase()) {
699 // On PASE, use the libo4 porting library.
700
701 unsigned long long virt_total = 0;
702 unsigned long long real_total = 0;
703 unsigned long long real_free = 0;
704 unsigned long long pgsp_total = 0;
705 unsigned long long pgsp_free = 0;
706 if (libo4::get_memory_info(&virt_total, &real_total, &real_free, &pgsp_total, &pgsp_free)) {
707 pmi->virt_total = virt_total;
708 pmi->real_total = real_total;
709 pmi->real_free = real_free;
710 pmi->pgsp_total = pgsp_total;
711 pmi->pgsp_free = pgsp_free;
712 return true;
713 }
714 return false;
715
716 } else {
717
718 // On AIX, I use the (dynamically loaded) perfstat library to retrieve memory statistics
719 // See:
720 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
721 // ?topic=/com.ibm.aix.basetechref/doc/basetrf1/perfstat_memtot.htm
722 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
723 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
724
725 perfstat_memory_total_t psmt;
726 memset (&psmt, '\0', sizeof(psmt));
727 const int rc = libperfstat::perfstat_memory_total(NULL, &psmt, sizeof(psmt), 1);
728 if (rc == -1) {
729 trcVerbose("perfstat_memory_total() failed (errno=%d)", errno);
730 assert(0, "perfstat_memory_total() failed");
731 return false;
732 }
733
734 assert(rc == 1, "perfstat_memory_total() - weird return code");
735
736 // excerpt from
737 // http://publib.boulder.ibm.com/infocenter/systems/index.jsp
738 // ?topic=/com.ibm.aix.files/doc/aixfiles/libperfstat.h.htm
739 // The fields of perfstat_memory_total_t:
740 // u_longlong_t virt_total Total virtual memory (in 4 KB pages).
741 // u_longlong_t real_total Total real memory (in 4 KB pages).
742 // u_longlong_t real_free Free real memory (in 4 KB pages).
743 // u_longlong_t pgsp_total Total paging space (in 4 KB pages).
744 // u_longlong_t pgsp_free Free paging space (in 4 KB pages).
745
746 pmi->virt_total = psmt.virt_total * 4096;
747 pmi->real_total = psmt.real_total * 4096;
748 pmi->real_free = psmt.real_free * 4096;
749 pmi->pgsp_total = psmt.pgsp_total * 4096;
750 pmi->pgsp_free = psmt.pgsp_free * 4096;
751
752 return true;
753
754 }
755 } // end os::Aix::get_meminfo
756
757 //////////////////////////////////////////////////////////////////////////////
758 // create new thread
759
760 // Thread start routine for all newly created threads
761 static void *thread_native_entry(Thread *thread) {
762
763 // find out my own stack dimensions
764 {
765 // actually, this should do exactly the same as thread->record_stack_base_and_size...
766 thread->set_stack_base(os::current_stack_base());
767 thread->set_stack_size(os::current_stack_size());
768 }
769
770 const pthread_t pthread_id = ::pthread_self();
771 const tid_t kernel_thread_id = ::thread_self();
772
773 LogTarget(Info, os, thread) lt;
774 if (lt.is_enabled()) {
775 address low_address = thread->stack_end();
776 address high_address = thread->stack_base();
777 lt.print("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT
778 ", stack [" PTR_FORMAT " - " PTR_FORMAT " (" SIZE_FORMAT "k using %uk pages)).",
779 os::current_thread_id(), (uintx) kernel_thread_id, low_address, high_address,
780 (high_address - low_address) / K, os::Aix::query_pagesize(low_address) / K);
781 }
782
783 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
784 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
785 // tools hook pthread_create(). In this case, we may run into problems establishing
786 // guard pages on those stacks, because the stacks may reside in memory which is not
787 // protectable (shmated).
788 if (thread->stack_base() > ::sbrk(0)) {
789 log_warning(os, thread)("Thread stack not in data segment.");
790 }
791
792 // Try to randomize the cache line index of hot stack frames.
793 // This helps when threads of the same stack traces evict each other's
794 // cache lines. The threads can be either from the same JVM instance, or
795 // from different JVM instances. The benefit is especially true for
796 // processors with hyperthreading technology.
797
798 static int counter = 0;
799 int pid = os::current_process_id();
800 alloca(((pid ^ counter++) & 7) * 128);
801
802 thread->initialize_thread_current();
803
804 OSThread* osthread = thread->osthread();
805
806 // Thread_id is pthread id.
807 osthread->set_thread_id(pthread_id);
808
809 // .. but keep kernel thread id too for diagnostics
810 osthread->set_kernel_thread_id(kernel_thread_id);
811
812 // Initialize signal mask for this thread.
813 os::Aix::hotspot_sigmask(thread);
814
815 // Initialize floating point control register.
816 os::Aix::init_thread_fpu_state();
817
818 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
819
820 // Call one more level start routine.
821 thread->run();
822
823 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
824 os::current_thread_id(), (uintx) kernel_thread_id);
825
826 // If a thread has not deleted itself ("delete this") as part of its
827 // termination sequence, we have to ensure thread-local-storage is
828 // cleared before we actually terminate. No threads should ever be
829 // deleted asynchronously with respect to their termination.
830 if (Thread::current_or_null_safe() != NULL) {
831 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
832 thread->clear_thread_current();
833 }
834
835 return 0;
836 }
837
838 bool os::create_thread(Thread* thread, ThreadType thr_type,
839 size_t req_stack_size) {
840
841 assert(thread->osthread() == NULL, "caller responsible");
842
843 // Allocate the OSThread object.
844 OSThread* osthread = new OSThread(NULL, NULL);
845 if (osthread == NULL) {
846 return false;
847 }
848
849 // Set the correct thread state.
850 osthread->set_thread_type(thr_type);
851
852 // Initial state is ALLOCATED but not INITIALIZED
853 osthread->set_state(ALLOCATED);
854
855 thread->set_osthread(osthread);
856
857 // Init thread attributes.
858 pthread_attr_t attr;
859 pthread_attr_init(&attr);
860 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
861
862 // Make sure we run in 1:1 kernel-user-thread mode.
863 if (os::Aix::on_aix()) {
864 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
865 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
866 }
867
868 // Start in suspended state, and in os::thread_start, wake the thread up.
869 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
870
871 // Calculate stack size if it's not specified by caller.
872 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
873
874 // JDK-8187028: It was observed that on some configurations (4K backed thread stacks)
875 // the real thread stack size may be smaller than the requested stack size, by as much as 64K.
876 // This very much looks like a pthread lib error. As a workaround, increase the stack size
877 // by 64K for small thread stacks (arbitrarily choosen to be < 4MB)
878 if (stack_size < 4096 * K) {
879 stack_size += 64 * K;
880 }
881
882 // On Aix, pthread_attr_setstacksize fails with huge values and leaves the
883 // thread size in attr unchanged. If this is the minimal stack size as set
884 // by pthread_attr_init this leads to crashes after thread creation. E.g. the
885 // guard pages might not fit on the tiny stack created.
886 int ret = pthread_attr_setstacksize(&attr, stack_size);
887 if (ret != 0) {
888 log_warning(os, thread)("The thread stack size specified is invalid: " SIZE_FORMAT "k",
889 stack_size / K);
890 }
891
892 // Save some cycles and a page by disabling OS guard pages where we have our own
893 // VM guard pages (in java threads). For other threads, keep system default guard
894 // pages in place.
895 if (thr_type == java_thread || thr_type == compiler_thread) {
896 ret = pthread_attr_setguardsize(&attr, 0);
897 }
898
899 pthread_t tid = 0;
900 if (ret == 0) {
901 ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
902 }
903
904 if (ret == 0) {
905 char buf[64];
906 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
907 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
908 } else {
909 char buf[64];
910 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
911 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
912 }
913
914 pthread_attr_destroy(&attr);
915
916 if (ret != 0) {
917 // Need to clean up stuff we've allocated so far.
918 thread->set_osthread(NULL);
919 delete osthread;
920 return false;
921 }
922
923 // OSThread::thread_id is the pthread id.
924 osthread->set_thread_id(tid);
925
926 return true;
927 }
928
929 /////////////////////////////////////////////////////////////////////////////
930 // attach existing thread
931
932 // bootstrap the main thread
933 bool os::create_main_thread(JavaThread* thread) {
934 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
935 return create_attached_thread(thread);
936 }
937
938 bool os::create_attached_thread(JavaThread* thread) {
939 #ifdef ASSERT
940 thread->verify_not_published();
941 #endif
942
943 // Allocate the OSThread object
944 OSThread* osthread = new OSThread(NULL, NULL);
945
946 if (osthread == NULL) {
947 return false;
948 }
949
950 const pthread_t pthread_id = ::pthread_self();
951 const tid_t kernel_thread_id = ::thread_self();
952
953 // OSThread::thread_id is the pthread id.
954 osthread->set_thread_id(pthread_id);
955
956 // .. but keep kernel thread id too for diagnostics
957 osthread->set_kernel_thread_id(kernel_thread_id);
958
959 // initialize floating point control register
960 os::Aix::init_thread_fpu_state();
961
962 // Initial thread state is RUNNABLE
963 osthread->set_state(RUNNABLE);
964
965 thread->set_osthread(osthread);
966
967 if (UseNUMA) {
968 int lgrp_id = os::numa_get_group_id();
969 if (lgrp_id != -1) {
970 thread->set_lgrp_id(lgrp_id);
971 }
972 }
973
974 // initialize signal mask for this thread
975 // and save the caller's signal mask
976 os::Aix::hotspot_sigmask(thread);
977
978 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
979 os::current_thread_id(), (uintx) kernel_thread_id);
980
981 return true;
982 }
983
984 void os::pd_start_thread(Thread* thread) {
985 int status = pthread_continue_np(thread->osthread()->pthread_id());
986 assert(status == 0, "thr_continue failed");
987 }
988
989 // Free OS resources related to the OSThread
990 void os::free_thread(OSThread* osthread) {
991 assert(osthread != NULL, "osthread not set");
992
993 // We are told to free resources of the argument thread,
994 // but we can only really operate on the current thread.
995 assert(Thread::current()->osthread() == osthread,
996 "os::free_thread but not current thread");
997
998 // Restore caller's signal mask
999 sigset_t sigmask = osthread->caller_sigmask();
1000 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
1001
1002 delete osthread;
1003 }
1004
1005 ////////////////////////////////////////////////////////////////////////////////
1006 // time support
1007
1008 // Time since start-up in seconds to a fine granularity.
1009 // Used by VMSelfDestructTimer and the MemProfiler.
1010 double os::elapsedTime() {
1011 return (double)(os::elapsed_counter()) * 0.000001;
1012 }
1013
1014 jlong os::elapsed_counter() {
1015 timeval time;
1016 int status = gettimeofday(&time, NULL);
1017 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
1018 }
1019
1020 jlong os::elapsed_frequency() {
1021 return (1000 * 1000);
1022 }
1023
1024 bool os::supports_vtime() { return true; }
1025 bool os::enable_vtime() { return false; }
1026 bool os::vtime_enabled() { return false; }
1027
1028 double os::elapsedVTime() {
1029 struct rusage usage;
1030 int retval = getrusage(RUSAGE_THREAD, &usage);
1031 if (retval == 0) {
1032 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1033 } else {
1034 // better than nothing, but not much
1035 return elapsedTime();
1036 }
1037 }
1038
1039 jlong os::javaTimeMillis() {
1040 timeval time;
1041 int status = gettimeofday(&time, NULL);
1042 assert(status != -1, "aix error at gettimeofday()");
1043 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1044 }
1045
1046 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1047 timeval time;
1048 int status = gettimeofday(&time, NULL);
1049 assert(status != -1, "aix error at gettimeofday()");
1050 seconds = jlong(time.tv_sec);
1051 nanos = jlong(time.tv_usec) * 1000;
1052 }
1053
1054 jlong os::javaTimeNanos() {
1055 if (os::Aix::on_pase()) {
1056
1057 timeval time;
1058 int status = gettimeofday(&time, NULL);
1059 assert(status != -1, "PASE error at gettimeofday()");
1060 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1061 return 1000 * usecs;
1062
1063 } else {
1064 // On AIX use the precision of processors real time clock
1065 // or time base registers.
1066 timebasestruct_t time;
1067 int rc;
1068
1069 // If the CPU has a time register, it will be used and
1070 // we have to convert to real time first. After convertion we have following data:
1071 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1072 // time.tb_low [nanoseconds after the last full second above]
1073 // We better use mread_real_time here instead of read_real_time
1074 // to ensure that we will get a monotonic increasing time.
1075 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1076 rc = time_base_to_time(&time, TIMEBASE_SZ);
1077 assert(rc != -1, "aix error at time_base_to_time()");
1078 }
1079 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1080 }
1081 }
1082
1083 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1084 info_ptr->max_value = ALL_64_BITS;
1085 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1086 info_ptr->may_skip_backward = false;
1087 info_ptr->may_skip_forward = false;
1088 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1089 }
1090
1091 // Return the real, user, and system times in seconds from an
1092 // arbitrary fixed point in the past.
1093 bool os::getTimesSecs(double* process_real_time,
1094 double* process_user_time,
1095 double* process_system_time) {
1096 struct tms ticks;
1097 clock_t real_ticks = times(&ticks);
1098
1099 if (real_ticks == (clock_t) (-1)) {
1100 return false;
1101 } else {
1102 double ticks_per_second = (double) clock_tics_per_sec;
1103 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1104 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1105 *process_real_time = ((double) real_ticks) / ticks_per_second;
1106
1107 return true;
1108 }
1109 }
1110
1111 char * os::local_time_string(char *buf, size_t buflen) {
1112 struct tm t;
1113 time_t long_time;
1114 time(&long_time);
1115 localtime_r(&long_time, &t);
1116 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1117 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1118 t.tm_hour, t.tm_min, t.tm_sec);
1119 return buf;
1120 }
1121
1122 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1123 return localtime_r(clock, res);
1124 }
1125
1126 ////////////////////////////////////////////////////////////////////////////////
1127 // runtime exit support
1128
1129 // Note: os::shutdown() might be called very early during initialization, or
1130 // called from signal handler. Before adding something to os::shutdown(), make
1131 // sure it is async-safe and can handle partially initialized VM.
1132 void os::shutdown() {
1133
1134 // allow PerfMemory to attempt cleanup of any persistent resources
1135 perfMemory_exit();
1136
1137 // needs to remove object in file system
1138 AttachListener::abort();
1139
1140 // flush buffered output, finish log files
1141 ostream_abort();
1142
1143 // Check for abort hook
1144 abort_hook_t abort_hook = Arguments::abort_hook();
1145 if (abort_hook != NULL) {
1146 abort_hook();
1147 }
1148 }
1149
1150 // Note: os::abort() might be called very early during initialization, or
1151 // called from signal handler. Before adding something to os::abort(), make
1152 // sure it is async-safe and can handle partially initialized VM.
1153 void os::abort(bool dump_core, void* siginfo, const void* context) {
1154 os::shutdown();
1155 if (dump_core) {
1156 #ifndef PRODUCT
1157 fdStream out(defaultStream::output_fd());
1158 out.print_raw("Current thread is ");
1159 char buf[16];
1160 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1161 out.print_raw_cr(buf);
1162 out.print_raw_cr("Dumping core ...");
1163 #endif
1164 ::abort(); // dump core
1165 }
1166
1167 ::exit(1);
1168 }
1169
1170 // Die immediately, no exit hook, no abort hook, no cleanup.
1171 void os::die() {
1172 ::abort();
1173 }
1174
1175 // This method is a copy of JDK's sysGetLastErrorString
1176 // from src/solaris/hpi/src/system_md.c
1177
1178 size_t os::lasterror(char *buf, size_t len) {
1179 if (errno == 0) return 0;
1180
1181 const char *s = os::strerror(errno);
1182 size_t n = ::strlen(s);
1183 if (n >= len) {
1184 n = len - 1;
1185 }
1186 ::strncpy(buf, s, n);
1187 buf[n] = '\0';
1188 return n;
1189 }
1190
1191 intx os::current_thread_id() {
1192 return (intx)pthread_self();
1193 }
1194
1195 int os::current_process_id() {
1196 return getpid();
1197 }
1198
1199 // DLL functions
1200
1201 const char* os::dll_file_extension() { return ".so"; }
1202
1203 // This must be hard coded because it's the system's temporary
1204 // directory not the java application's temp directory, ala java.io.tmpdir.
1205 const char* os::get_temp_directory() { return "/tmp"; }
1206
1207 // Check if addr is inside libjvm.so.
1208 bool os::address_is_in_vm(address addr) {
1209
1210 // Input could be a real pc or a function pointer literal. The latter
1211 // would be a function descriptor residing in the data segment of a module.
1212 loaded_module_t lm;
1213 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1214 return lm.is_in_vm;
1215 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1216 return lm.is_in_vm;
1217 } else {
1218 return false;
1219 }
1220
1221 }
1222
1223 // Resolve an AIX function descriptor literal to a code pointer.
1224 // If the input is a valid code pointer to a text segment of a loaded module,
1225 // it is returned unchanged.
1226 // If the input is a valid AIX function descriptor, it is resolved to the
1227 // code entry point.
1228 // If the input is neither a valid function descriptor nor a valid code pointer,
1229 // NULL is returned.
1230 static address resolve_function_descriptor_to_code_pointer(address p) {
1231
1232 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1233 // It is a real code pointer.
1234 return p;
1235 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1236 // Pointer to data segment, potential function descriptor.
1237 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1238 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1239 // It is a function descriptor.
1240 return code_entry;
1241 }
1242 }
1243
1244 return NULL;
1245 }
1246
1247 bool os::dll_address_to_function_name(address addr, char *buf,
1248 int buflen, int *offset,
1249 bool demangle) {
1250 if (offset) {
1251 *offset = -1;
1252 }
1253 // Buf is not optional, but offset is optional.
1254 assert(buf != NULL, "sanity check");
1255 buf[0] = '\0';
1256
1257 // Resolve function ptr literals first.
1258 addr = resolve_function_descriptor_to_code_pointer(addr);
1259 if (!addr) {
1260 return false;
1261 }
1262
1263 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1264 }
1265
1266 bool os::dll_address_to_library_name(address addr, char* buf,
1267 int buflen, int* offset) {
1268 if (offset) {
1269 *offset = -1;
1270 }
1271 // Buf is not optional, but offset is optional.
1272 assert(buf != NULL, "sanity check");
1273 buf[0] = '\0';
1274
1275 // Resolve function ptr literals first.
1276 addr = resolve_function_descriptor_to_code_pointer(addr);
1277 if (!addr) {
1278 return false;
1279 }
1280
1281 return AixSymbols::get_module_name(addr, buf, buflen);
1282 }
1283
1284 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1285 // for the same architecture as Hotspot is running on.
1286 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1287
1288 if (ebuf && ebuflen > 0) {
1289 ebuf[0] = '\0';
1290 ebuf[ebuflen - 1] = '\0';
1291 }
1292
1293 if (!filename || strlen(filename) == 0) {
1294 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1295 return NULL;
1296 }
1297
1298 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1299 void * result= ::dlopen(filename, RTLD_LAZY);
1300 if (result != NULL) {
1301 // Reload dll cache. Don't do this in signal handling.
1302 LoadedLibraries::reload();
1303 return result;
1304 } else {
1305 // error analysis when dlopen fails
1306 const char* const error_report = ::dlerror();
1307 if (error_report && ebuf && ebuflen > 0) {
1308 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1309 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1310 }
1311 }
1312 return NULL;
1313 }
1314
1315 void* os::dll_lookup(void* handle, const char* name) {
1316 void* res = dlsym(handle, name);
1317 return res;
1318 }
1319
1320 void* os::get_default_process_handle() {
1321 return (void*)::dlopen(NULL, RTLD_LAZY);
1322 }
1323
1324 void os::print_dll_info(outputStream *st) {
1325 st->print_cr("Dynamic libraries:");
1326 LoadedLibraries::print(st);
1327 }
1328
1329 void os::get_summary_os_info(char* buf, size_t buflen) {
1330 // There might be something more readable than uname results for AIX.
1331 struct utsname name;
1332 uname(&name);
1333 snprintf(buf, buflen, "%s %s", name.release, name.version);
1334 }
1335
1336 void os::print_os_info(outputStream* st) {
1337 st->print("OS:");
1338
1339 st->print("uname:");
1340 struct utsname name;
1341 uname(&name);
1342 st->print(name.sysname); st->print(" ");
1343 st->print(name.nodename); st->print(" ");
1344 st->print(name.release); st->print(" ");
1345 st->print(name.version); st->print(" ");
1346 st->print(name.machine);
1347 st->cr();
1348
1349 uint32_t ver = os::Aix::os_version();
1350 st->print_cr("AIX kernel version %u.%u.%u.%u",
1351 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1352
1353 os::Posix::print_rlimit_info(st);
1354
1355 // load average
1356 st->print("load average:");
1357 double loadavg[3] = {-1.L, -1.L, -1.L};
1358 os::loadavg(loadavg, 3);
1359 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1360 st->cr();
1361
1362 // print wpar info
1363 libperfstat::wparinfo_t wi;
1364 if (libperfstat::get_wparinfo(&wi)) {
1365 st->print_cr("wpar info");
1366 st->print_cr("name: %s", wi.name);
1367 st->print_cr("id: %d", wi.wpar_id);
1368 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1369 }
1370
1371 // print partition info
1372 libperfstat::partitioninfo_t pi;
1373 if (libperfstat::get_partitioninfo(&pi)) {
1374 st->print_cr("partition info");
1375 st->print_cr(" name: %s", pi.name);
1376 }
1377
1378 }
1379
1380 void os::print_memory_info(outputStream* st) {
1381
1382 st->print_cr("Memory:");
1383
1384 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1385 describe_pagesize(g_multipage_support.pagesize));
1386 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1387 describe_pagesize(g_multipage_support.datapsize));
1388 st->print_cr(" Text page size: %s",
1389 describe_pagesize(g_multipage_support.textpsize));
1390 st->print_cr(" Thread stack page size (pthread): %s",
1391 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1392 st->print_cr(" Default shared memory page size: %s",
1393 describe_pagesize(g_multipage_support.shmpsize));
1394 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1395 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1396 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1397 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1398 st->print_cr(" Multipage error: %d",
1399 g_multipage_support.error);
1400 st->cr();
1401 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1402
1403 // print out LDR_CNTRL because it affects the default page sizes
1404 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1405 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1406
1407 // Print out EXTSHM because it is an unsupported setting.
1408 const char* const extshm = ::getenv("EXTSHM");
1409 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1410 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1411 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1412 }
1413
1414 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1415 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1416 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1417 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1418
1419 os::Aix::meminfo_t mi;
1420 if (os::Aix::get_meminfo(&mi)) {
1421 char buffer[256];
1422 if (os::Aix::on_aix()) {
1423 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1424 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1425 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1426 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1427 } else {
1428 // PASE - Numbers are result of QWCRSSTS; they mean:
1429 // real_total: Sum of all system pools
1430 // real_free: always 0
1431 // pgsp_total: we take the size of the system ASP
1432 // pgsp_free: size of system ASP times percentage of system ASP unused
1433 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1434 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1435 st->print_cr("%% system asp used : " SIZE_FORMAT,
1436 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1437 }
1438 st->print_raw(buffer);
1439 }
1440 st->cr();
1441
1442 // Print segments allocated with os::reserve_memory.
1443 st->print_cr("internal virtual memory regions used by vm:");
1444 vmembk_print_on(st);
1445 }
1446
1447 // Get a string for the cpuinfo that is a summary of the cpu type
1448 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1449 // This looks good
1450 libperfstat::cpuinfo_t ci;
1451 if (libperfstat::get_cpuinfo(&ci)) {
1452 strncpy(buf, ci.version, buflen);
1453 } else {
1454 strncpy(buf, "AIX", buflen);
1455 }
1456 }
1457
1458 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1459 // Nothing to do beyond what os::print_cpu_info() does.
1460 }
1461
1462 static void print_signal_handler(outputStream* st, int sig,
1463 char* buf, size_t buflen);
1464
1465 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1466 st->print_cr("Signal Handlers:");
1467 print_signal_handler(st, SIGSEGV, buf, buflen);
1468 print_signal_handler(st, SIGBUS , buf, buflen);
1469 print_signal_handler(st, SIGFPE , buf, buflen);
1470 print_signal_handler(st, SIGPIPE, buf, buflen);
1471 print_signal_handler(st, SIGXFSZ, buf, buflen);
1472 print_signal_handler(st, SIGILL , buf, buflen);
1473 print_signal_handler(st, SR_signum, buf, buflen);
1474 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1475 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1476 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1477 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1478 print_signal_handler(st, SIGTRAP, buf, buflen);
1479 // We also want to know if someone else adds a SIGDANGER handler because
1480 // that will interfere with OOM killling.
1481 print_signal_handler(st, SIGDANGER, buf, buflen);
1482 }
1483
1484 static char saved_jvm_path[MAXPATHLEN] = {0};
1485
1486 // Find the full path to the current module, libjvm.so.
1487 void os::jvm_path(char *buf, jint buflen) {
1488 // Error checking.
1489 if (buflen < MAXPATHLEN) {
1490 assert(false, "must use a large-enough buffer");
1491 buf[0] = '\0';
1492 return;
1493 }
1494 // Lazy resolve the path to current module.
1495 if (saved_jvm_path[0] != 0) {
1496 strcpy(buf, saved_jvm_path);
1497 return;
1498 }
1499
1500 Dl_info dlinfo;
1501 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1502 assert(ret != 0, "cannot locate libjvm");
1503 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1504 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1505
1506 if (Arguments::sun_java_launcher_is_altjvm()) {
1507 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1508 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1509 // If "/jre/lib/" appears at the right place in the string, then
1510 // assume we are installed in a JDK and we're done. Otherwise, check
1511 // for a JAVA_HOME environment variable and fix up the path so it
1512 // looks like libjvm.so is installed there (append a fake suffix
1513 // hotspot/libjvm.so).
1514 const char *p = buf + strlen(buf) - 1;
1515 for (int count = 0; p > buf && count < 4; ++count) {
1516 for (--p; p > buf && *p != '/'; --p)
1517 /* empty */ ;
1518 }
1519
1520 if (strncmp(p, "/jre/lib/", 9) != 0) {
1521 // Look for JAVA_HOME in the environment.
1522 char* java_home_var = ::getenv("JAVA_HOME");
1523 if (java_home_var != NULL && java_home_var[0] != 0) {
1524 char* jrelib_p;
1525 int len;
1526
1527 // Check the current module name "libjvm.so".
1528 p = strrchr(buf, '/');
1529 if (p == NULL) {
1530 return;
1531 }
1532 assert(strstr(p, "/libjvm") == p, "invalid library name");
1533
1534 rp = os::Posix::realpath(java_home_var, buf, buflen);
1535 if (rp == NULL) {
1536 return;
1537 }
1538
1539 // determine if this is a legacy image or modules image
1540 // modules image doesn't have "jre" subdirectory
1541 len = strlen(buf);
1542 assert(len < buflen, "Ran out of buffer room");
1543 jrelib_p = buf + len;
1544 snprintf(jrelib_p, buflen-len, "/jre/lib");
1545 if (0 != access(buf, F_OK)) {
1546 snprintf(jrelib_p, buflen-len, "/lib");
1547 }
1548
1549 if (0 == access(buf, F_OK)) {
1550 // Use current module name "libjvm.so"
1551 len = strlen(buf);
1552 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1553 } else {
1554 // Go back to path of .so
1555 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1556 if (rp == NULL) {
1557 return;
1558 }
1559 }
1560 }
1561 }
1562 }
1563
1564 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1565 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1566 }
1567
1568 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1569 // no prefix required, not even "_"
1570 }
1571
1572 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1573 // no suffix required
1574 }
1575
1576 ////////////////////////////////////////////////////////////////////////////////
1577 // sun.misc.Signal support
1578
1579 static volatile jint sigint_count = 0;
1580
1581 static void
1582 UserHandler(int sig, void *siginfo, void *context) {
1583 // 4511530 - sem_post is serialized and handled by the manager thread. When
1584 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1585 // don't want to flood the manager thread with sem_post requests.
1586 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1587 return;
1588
1589 // Ctrl-C is pressed during error reporting, likely because the error
1590 // handler fails to abort. Let VM die immediately.
1591 if (sig == SIGINT && VMError::is_error_reported()) {
1592 os::die();
1593 }
1594
1595 os::signal_notify(sig);
1596 }
1597
1598 void* os::user_handler() {
1599 return CAST_FROM_FN_PTR(void*, UserHandler);
1600 }
1601
1602 extern "C" {
1603 typedef void (*sa_handler_t)(int);
1604 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1605 }
1606
1607 void* os::signal(int signal_number, void* handler) {
1608 struct sigaction sigAct, oldSigAct;
1609
1610 sigfillset(&(sigAct.sa_mask));
1611
1612 // Do not block out synchronous signals in the signal handler.
1613 // Blocking synchronous signals only makes sense if you can really
1614 // be sure that those signals won't happen during signal handling,
1615 // when the blocking applies. Normal signal handlers are lean and
1616 // do not cause signals. But our signal handlers tend to be "risky"
1617 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1618 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1619 // by a SIGILL, which was blocked due to the signal mask. The process
1620 // just hung forever. Better to crash from a secondary signal than to hang.
1621 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1622 sigdelset(&(sigAct.sa_mask), SIGBUS);
1623 sigdelset(&(sigAct.sa_mask), SIGILL);
1624 sigdelset(&(sigAct.sa_mask), SIGFPE);
1625 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1626
1627 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1628
1629 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1630
1631 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1632 // -1 means registration failed
1633 return (void *)-1;
1634 }
1635
1636 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1637 }
1638
1639 void os::signal_raise(int signal_number) {
1640 ::raise(signal_number);
1641 }
1642
1643 //
1644 // The following code is moved from os.cpp for making this
1645 // code platform specific, which it is by its very nature.
1646 //
1647
1648 // Will be modified when max signal is changed to be dynamic
1649 int os::sigexitnum_pd() {
1650 return NSIG;
1651 }
1652
1653 // a counter for each possible signal value
1654 static volatile jint pending_signals[NSIG+1] = { 0 };
1655
1656 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1657 // On AIX, we use sem_init(), sem_post(), sem_wait()
1658 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1659 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1660 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1661 // on AIX, msem_..() calls are suspected of causing problems.
1662 static sem_t sig_sem;
1663 static msemaphore* p_sig_msem = 0;
1664
1665 static void local_sem_init() {
1666 if (os::Aix::on_aix()) {
1667 int rc = ::sem_init(&sig_sem, 0, 0);
1668 guarantee(rc != -1, "sem_init failed");
1669 } else {
1670 // Memory semaphores must live in shared mem.
1671 guarantee0(p_sig_msem == NULL);
1672 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1673 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1674 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1675 }
1676 }
1677
1678 static void local_sem_post() {
1679 static bool warn_only_once = false;
1680 if (os::Aix::on_aix()) {
1681 int rc = ::sem_post(&sig_sem);
1682 if (rc == -1 && !warn_only_once) {
1683 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1684 warn_only_once = true;
1685 }
1686 } else {
1687 guarantee0(p_sig_msem != NULL);
1688 int rc = ::msem_unlock(p_sig_msem, 0);
1689 if (rc == -1 && !warn_only_once) {
1690 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1691 warn_only_once = true;
1692 }
1693 }
1694 }
1695
1696 static void local_sem_wait() {
1697 static bool warn_only_once = false;
1698 if (os::Aix::on_aix()) {
1699 int rc = ::sem_wait(&sig_sem);
1700 if (rc == -1 && !warn_only_once) {
1701 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1702 warn_only_once = true;
1703 }
1704 } else {
1705 guarantee0(p_sig_msem != NULL); // must init before use
1706 int rc = ::msem_lock(p_sig_msem, 0);
1707 if (rc == -1 && !warn_only_once) {
1708 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1709 warn_only_once = true;
1710 }
1711 }
1712 }
1713
1714 void os::signal_init_pd() {
1715 // Initialize signal structures
1716 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1717
1718 // Initialize signal semaphore
1719 local_sem_init();
1720 }
1721
1722 void os::signal_notify(int sig) {
1723 Atomic::inc(&pending_signals[sig]);
1724 local_sem_post();
1725 }
1726
1727 static int check_pending_signals(bool wait) {
1728 Atomic::store(0, &sigint_count);
1729 for (;;) {
1730 for (int i = 0; i < NSIG + 1; i++) {
1731 jint n = pending_signals[i];
1732 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1733 return i;
1734 }
1735 }
1736 if (!wait) {
1737 return -1;
1738 }
1739 JavaThread *thread = JavaThread::current();
1740 ThreadBlockInVM tbivm(thread);
1741
1742 bool threadIsSuspended;
1743 do {
1744 thread->set_suspend_equivalent();
1745 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1746
1747 local_sem_wait();
1748
1749 // were we externally suspended while we were waiting?
1750 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1751 if (threadIsSuspended) {
1752 //
1753 // The semaphore has been incremented, but while we were waiting
1754 // another thread suspended us. We don't want to continue running
1755 // while suspended because that would surprise the thread that
1756 // suspended us.
1757 //
1758
1759 local_sem_post();
1760
1761 thread->java_suspend_self();
1762 }
1763 } while (threadIsSuspended);
1764 }
1765 }
1766
1767 int os::signal_lookup() {
1768 return check_pending_signals(false);
1769 }
1770
1771 int os::signal_wait() {
1772 return check_pending_signals(true);
1773 }
1774
1775 ////////////////////////////////////////////////////////////////////////////////
1776 // Virtual Memory
1777
1778 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1779
1780 #define VMEM_MAPPED 1
1781 #define VMEM_SHMATED 2
1782
1783 struct vmembk_t {
1784 int type; // 1 - mmap, 2 - shmat
1785 char* addr;
1786 size_t size; // Real size, may be larger than usersize.
1787 size_t pagesize; // page size of area
1788 vmembk_t* next;
1789
1790 bool contains_addr(char* p) const {
1791 return p >= addr && p < (addr + size);
1792 }
1793
1794 bool contains_range(char* p, size_t s) const {
1795 return contains_addr(p) && contains_addr(p + s - 1);
1796 }
1797
1798 void print_on(outputStream* os) const {
1799 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1800 " bytes, %d %s pages), %s",
1801 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1802 (type == VMEM_SHMATED ? "shmat" : "mmap")
1803 );
1804 }
1805
1806 // Check that range is a sub range of memory block (or equal to memory block);
1807 // also check that range is fully page aligned to the page size if the block.
1808 void assert_is_valid_subrange(char* p, size_t s) const {
1809 if (!contains_range(p, s)) {
1810 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1811 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1812 p, p + s, addr, addr + size);
1813 guarantee0(false);
1814 }
1815 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1816 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1817 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1818 guarantee0(false);
1819 }
1820 }
1821 };
1822
1823 static struct {
1824 vmembk_t* first;
1825 MiscUtils::CritSect cs;
1826 } vmem;
1827
1828 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1829 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1830 assert0(p);
1831 if (p) {
1832 MiscUtils::AutoCritSect lck(&vmem.cs);
1833 p->addr = addr; p->size = size;
1834 p->pagesize = pagesize;
1835 p->type = type;
1836 p->next = vmem.first;
1837 vmem.first = p;
1838 }
1839 }
1840
1841 static vmembk_t* vmembk_find(char* addr) {
1842 MiscUtils::AutoCritSect lck(&vmem.cs);
1843 for (vmembk_t* p = vmem.first; p; p = p->next) {
1844 if (p->addr <= addr && (p->addr + p->size) > addr) {
1845 return p;
1846 }
1847 }
1848 return NULL;
1849 }
1850
1851 static void vmembk_remove(vmembk_t* p0) {
1852 MiscUtils::AutoCritSect lck(&vmem.cs);
1853 assert0(p0);
1854 assert0(vmem.first); // List should not be empty.
1855 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1856 if (*pp == p0) {
1857 *pp = p0->next;
1858 ::free(p0);
1859 return;
1860 }
1861 }
1862 assert0(false); // Not found?
1863 }
1864
1865 static void vmembk_print_on(outputStream* os) {
1866 MiscUtils::AutoCritSect lck(&vmem.cs);
1867 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1868 vmi->print_on(os);
1869 os->cr();
1870 }
1871 }
1872
1873 // Reserve and attach a section of System V memory.
1874 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1875 // address. Failing that, it will attach the memory anywhere.
1876 // If <requested_addr> is NULL, function will attach the memory anywhere.
1877 //
1878 // <alignment_hint> is being ignored by this function. It is very probable however that the
1879 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1880 // Should this be not enogh, we can put more work into it.
1881 static char* reserve_shmated_memory (
1882 size_t bytes,
1883 char* requested_addr,
1884 size_t alignment_hint) {
1885
1886 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1887 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1888 bytes, requested_addr, alignment_hint);
1889
1890 // Either give me wish address or wish alignment but not both.
1891 assert0(!(requested_addr != NULL && alignment_hint != 0));
1892
1893 // We must prevent anyone from attaching too close to the
1894 // BRK because that may cause malloc OOM.
1895 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1896 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1897 "Will attach anywhere.", requested_addr);
1898 // Act like the OS refused to attach there.
1899 requested_addr = NULL;
1900 }
1901
1902 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1903 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1904 if (os::Aix::on_pase_V5R4_or_older()) {
1905 ShouldNotReachHere();
1906 }
1907
1908 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1909 const size_t size = align_up(bytes, 64*K);
1910
1911 // Reserve the shared segment.
1912 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1913 if (shmid == -1) {
1914 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1915 return NULL;
1916 }
1917
1918 // Important note:
1919 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1920 // We must right after attaching it remove it from the system. System V shm segments are global and
1921 // survive the process.
1922 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1923
1924 struct shmid_ds shmbuf;
1925 memset(&shmbuf, 0, sizeof(shmbuf));
1926 shmbuf.shm_pagesize = 64*K;
1927 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1928 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1929 size / (64*K), errno);
1930 // I want to know if this ever happens.
1931 assert(false, "failed to set page size for shmat");
1932 }
1933
1934 // Now attach the shared segment.
1935 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1936 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1937 // were not a segment boundary.
1938 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1939 const int errno_shmat = errno;
1940
1941 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1942 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1943 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1944 assert(false, "failed to remove shared memory segment!");
1945 }
1946
1947 // Handle shmat error. If we failed to attach, just return.
1948 if (addr == (char*)-1) {
1949 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1950 return NULL;
1951 }
1952
1953 // Just for info: query the real page size. In case setting the page size did not
1954 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
1955 const size_t real_pagesize = os::Aix::query_pagesize(addr);
1956 if (real_pagesize != shmbuf.shm_pagesize) {
1957 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
1958 }
1959
1960 if (addr) {
1961 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
1962 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
1963 } else {
1964 if (requested_addr != NULL) {
1965 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
1966 } else {
1967 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
1968 }
1969 }
1970
1971 // book-keeping
1972 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
1973 assert0(is_aligned_to(addr, os::vm_page_size()));
1974
1975 return addr;
1976 }
1977
1978 static bool release_shmated_memory(char* addr, size_t size) {
1979
1980 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
1981 addr, addr + size - 1);
1982
1983 bool rc = false;
1984
1985 // TODO: is there a way to verify shm size without doing bookkeeping?
1986 if (::shmdt(addr) != 0) {
1987 trcVerbose("error (%d).", errno);
1988 } else {
1989 trcVerbose("ok.");
1990 rc = true;
1991 }
1992 return rc;
1993 }
1994
1995 static bool uncommit_shmated_memory(char* addr, size_t size) {
1996 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
1997 addr, addr + size - 1);
1998
1999 const bool rc = my_disclaim64(addr, size);
2000
2001 if (!rc) {
2002 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2003 return false;
2004 }
2005 return true;
2006 }
2007
2008 //////////////////////////////// mmap-based routines /////////////////////////////////
2009
2010 // Reserve memory via mmap.
2011 // If <requested_addr> is given, an attempt is made to attach at the given address.
2012 // Failing that, memory is allocated at any address.
2013 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2014 // allocate at an address aligned with the given alignment. Failing that, memory
2015 // is aligned anywhere.
2016 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2017 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2018 "alignment_hint " UINTX_FORMAT "...",
2019 bytes, requested_addr, alignment_hint);
2020
2021 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2022 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2023 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2024 return NULL;
2025 }
2026
2027 // We must prevent anyone from attaching too close to the
2028 // BRK because that may cause malloc OOM.
2029 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2030 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2031 "Will attach anywhere.", requested_addr);
2032 // Act like the OS refused to attach there.
2033 requested_addr = NULL;
2034 }
2035
2036 // Specify one or the other but not both.
2037 assert0(!(requested_addr != NULL && alignment_hint > 0));
2038
2039 // In 64K mode, we claim the global page size (os::vm_page_size())
2040 // is 64K. This is one of the few points where that illusion may
2041 // break, because mmap() will always return memory aligned to 4K. So
2042 // we must ensure we only ever return memory aligned to 64k.
2043 if (alignment_hint) {
2044 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2045 } else {
2046 alignment_hint = os::vm_page_size();
2047 }
2048
2049 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2050 const size_t size = align_up(bytes, os::vm_page_size());
2051
2052 // alignment: Allocate memory large enough to include an aligned range of the right size and
2053 // cut off the leading and trailing waste pages.
2054 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2055 const size_t extra_size = size + alignment_hint;
2056
2057 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2058 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2059 int flags = MAP_ANONYMOUS | MAP_SHARED;
2060
2061 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2062 // it means if wishaddress is given but MAP_FIXED is not set.
2063 //
2064 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2065 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2066 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2067 // get clobbered.
2068 if (requested_addr != NULL) {
2069 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2070 flags |= MAP_FIXED;
2071 }
2072 }
2073
2074 char* addr = (char*)::mmap(requested_addr, extra_size,
2075 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2076
2077 if (addr == MAP_FAILED) {
2078 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2079 return NULL;
2080 }
2081
2082 // Handle alignment.
2083 char* const addr_aligned = align_up(addr, alignment_hint);
2084 const size_t waste_pre = addr_aligned - addr;
2085 char* const addr_aligned_end = addr_aligned + size;
2086 const size_t waste_post = extra_size - waste_pre - size;
2087 if (waste_pre > 0) {
2088 ::munmap(addr, waste_pre);
2089 }
2090 if (waste_post > 0) {
2091 ::munmap(addr_aligned_end, waste_post);
2092 }
2093 addr = addr_aligned;
2094
2095 if (addr) {
2096 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2097 addr, addr + bytes, bytes);
2098 } else {
2099 if (requested_addr != NULL) {
2100 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2101 } else {
2102 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2103 }
2104 }
2105
2106 // bookkeeping
2107 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2108
2109 // Test alignment, see above.
2110 assert0(is_aligned_to(addr, os::vm_page_size()));
2111
2112 return addr;
2113 }
2114
2115 static bool release_mmaped_memory(char* addr, size_t size) {
2116 assert0(is_aligned_to(addr, os::vm_page_size()));
2117 assert0(is_aligned_to(size, os::vm_page_size()));
2118
2119 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2120 addr, addr + size - 1);
2121 bool rc = false;
2122
2123 if (::munmap(addr, size) != 0) {
2124 trcVerbose("failed (%d)\n", errno);
2125 rc = false;
2126 } else {
2127 trcVerbose("ok.");
2128 rc = true;
2129 }
2130
2131 return rc;
2132 }
2133
2134 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2135
2136 assert0(is_aligned_to(addr, os::vm_page_size()));
2137 assert0(is_aligned_to(size, os::vm_page_size()));
2138
2139 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2140 addr, addr + size - 1);
2141 bool rc = false;
2142
2143 // Uncommit mmap memory with msync MS_INVALIDATE.
2144 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2145 trcVerbose("failed (%d)\n", errno);
2146 rc = false;
2147 } else {
2148 trcVerbose("ok.");
2149 rc = true;
2150 }
2151
2152 return rc;
2153 }
2154
2155 int os::vm_page_size() {
2156 // Seems redundant as all get out.
2157 assert(os::Aix::page_size() != -1, "must call os::init");
2158 return os::Aix::page_size();
2159 }
2160
2161 // Aix allocates memory by pages.
2162 int os::vm_allocation_granularity() {
2163 assert(os::Aix::page_size() != -1, "must call os::init");
2164 return os::Aix::page_size();
2165 }
2166
2167 #ifdef PRODUCT
2168 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2169 int err) {
2170 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2171 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2172 os::errno_name(err), err);
2173 }
2174 #endif
2175
2176 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2177 const char* mesg) {
2178 assert(mesg != NULL, "mesg must be specified");
2179 if (!pd_commit_memory(addr, size, exec)) {
2180 // Add extra info in product mode for vm_exit_out_of_memory():
2181 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2182 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2183 }
2184 }
2185
2186 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2187
2188 assert(is_aligned_to(addr, os::vm_page_size()),
2189 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2190 p2i(addr), os::vm_page_size());
2191 assert(is_aligned_to(size, os::vm_page_size()),
2192 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2193 size, os::vm_page_size());
2194
2195 vmembk_t* const vmi = vmembk_find(addr);
2196 guarantee0(vmi);
2197 vmi->assert_is_valid_subrange(addr, size);
2198
2199 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2200
2201 if (UseExplicitCommit) {
2202 // AIX commits memory on touch. So, touch all pages to be committed.
2203 for (char* p = addr; p < (addr + size); p += 4*K) {
2204 *p = '\0';
2205 }
2206 }
2207
2208 return true;
2209 }
2210
2211 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2212 return pd_commit_memory(addr, size, exec);
2213 }
2214
2215 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2216 size_t alignment_hint, bool exec,
2217 const char* mesg) {
2218 // Alignment_hint is ignored on this OS.
2219 pd_commit_memory_or_exit(addr, size, exec, mesg);
2220 }
2221
2222 bool os::pd_uncommit_memory(char* addr, size_t size) {
2223 assert(is_aligned_to(addr, os::vm_page_size()),
2224 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2225 p2i(addr), os::vm_page_size());
2226 assert(is_aligned_to(size, os::vm_page_size()),
2227 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2228 size, os::vm_page_size());
2229
2230 // Dynamically do different things for mmap/shmat.
2231 const vmembk_t* const vmi = vmembk_find(addr);
2232 guarantee0(vmi);
2233 vmi->assert_is_valid_subrange(addr, size);
2234
2235 if (vmi->type == VMEM_SHMATED) {
2236 return uncommit_shmated_memory(addr, size);
2237 } else {
2238 return uncommit_mmaped_memory(addr, size);
2239 }
2240 }
2241
2242 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2243 // Do not call this; no need to commit stack pages on AIX.
2244 ShouldNotReachHere();
2245 return true;
2246 }
2247
2248 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2249 // Do not call this; no need to commit stack pages on AIX.
2250 ShouldNotReachHere();
2251 return true;
2252 }
2253
2254 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2255 }
2256
2257 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2258 }
2259
2260 void os::numa_make_global(char *addr, size_t bytes) {
2261 }
2262
2263 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2264 }
2265
2266 bool os::numa_topology_changed() {
2267 return false;
2268 }
2269
2270 size_t os::numa_get_groups_num() {
2271 return 1;
2272 }
2273
2274 int os::numa_get_group_id() {
2275 return 0;
2276 }
2277
2278 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2279 if (size > 0) {
2280 ids[0] = 0;
2281 return 1;
2282 }
2283 return 0;
2284 }
2285
2286 bool os::get_page_info(char *start, page_info* info) {
2287 return false;
2288 }
2289
2290 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2291 return end;
2292 }
2293
2294 // Reserves and attaches a shared memory segment.
2295 // Will assert if a wish address is given and could not be obtained.
2296 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2297
2298 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2299 // thereby clobbering old mappings at that place. That is probably
2300 // not intended, never used and almost certainly an error were it
2301 // ever be used this way (to try attaching at a specified address
2302 // without clobbering old mappings an alternate API exists,
2303 // os::attempt_reserve_memory_at()).
2304 // Instead of mimicking the dangerous coding of the other platforms, here I
2305 // just ignore the request address (release) or assert(debug).
2306 assert0(requested_addr == NULL);
2307
2308 // Always round to os::vm_page_size(), which may be larger than 4K.
2309 bytes = align_up(bytes, os::vm_page_size());
2310 const size_t alignment_hint0 =
2311 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2312
2313 // In 4K mode always use mmap.
2314 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2315 if (os::vm_page_size() == 4*K) {
2316 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2317 } else {
2318 if (bytes >= Use64KPagesThreshold) {
2319 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2320 } else {
2321 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2322 }
2323 }
2324 }
2325
2326 bool os::pd_release_memory(char* addr, size_t size) {
2327
2328 // Dynamically do different things for mmap/shmat.
2329 vmembk_t* const vmi = vmembk_find(addr);
2330 guarantee0(vmi);
2331
2332 // Always round to os::vm_page_size(), which may be larger than 4K.
2333 size = align_up(size, os::vm_page_size());
2334 addr = align_up(addr, os::vm_page_size());
2335
2336 bool rc = false;
2337 bool remove_bookkeeping = false;
2338 if (vmi->type == VMEM_SHMATED) {
2339 // For shmatted memory, we do:
2340 // - If user wants to release the whole range, release the memory (shmdt).
2341 // - If user only wants to release a partial range, uncommit (disclaim) that
2342 // range. That way, at least, we do not use memory anymore (bust still page
2343 // table space).
2344 vmi->assert_is_valid_subrange(addr, size);
2345 if (addr == vmi->addr && size == vmi->size) {
2346 rc = release_shmated_memory(addr, size);
2347 remove_bookkeeping = true;
2348 } else {
2349 rc = uncommit_shmated_memory(addr, size);
2350 }
2351 } else {
2352 // User may unmap partial regions but region has to be fully contained.
2353 #ifdef ASSERT
2354 vmi->assert_is_valid_subrange(addr, size);
2355 #endif
2356 rc = release_mmaped_memory(addr, size);
2357 remove_bookkeeping = true;
2358 }
2359
2360 // update bookkeeping
2361 if (rc && remove_bookkeeping) {
2362 vmembk_remove(vmi);
2363 }
2364
2365 return rc;
2366 }
2367
2368 static bool checked_mprotect(char* addr, size_t size, int prot) {
2369
2370 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2371 // not tell me if protection failed when trying to protect an un-protectable range.
2372 //
2373 // This means if the memory was allocated using shmget/shmat, protection wont work
2374 // but mprotect will still return 0:
2375 //
2376 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2377
2378 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2379
2380 if (!rc) {
2381 const char* const s_errno = os::errno_name(errno);
2382 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2383 return false;
2384 }
2385
2386 // mprotect success check
2387 //
2388 // Mprotect said it changed the protection but can I believe it?
2389 //
2390 // To be sure I need to check the protection afterwards. Try to
2391 // read from protected memory and check whether that causes a segfault.
2392 //
2393 if (!os::Aix::xpg_sus_mode()) {
2394
2395 if (CanUseSafeFetch32()) {
2396
2397 const bool read_protected =
2398 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2399 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2400
2401 if (prot & PROT_READ) {
2402 rc = !read_protected;
2403 } else {
2404 rc = read_protected;
2405 }
2406
2407 if (!rc) {
2408 if (os::Aix::on_pase()) {
2409 // There is an issue on older PASE systems where mprotect() will return success but the
2410 // memory will not be protected.
2411 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2412 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2413 // a stack. It is an OS error.
2414 //
2415 // A valid strategy is just to try again. This usually works. :-/
2416
2417 ::usleep(1000);
2418 if (::mprotect(addr, size, prot) == 0) {
2419 const bool read_protected_2 =
2420 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2421 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2422 rc = true;
2423 }
2424 }
2425 }
2426 }
2427 }
2428
2429 assert(rc == true, "mprotect failed.");
2430
2431 return rc;
2432 }
2433
2434 // Set protections specified
2435 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2436 unsigned int p = 0;
2437 switch (prot) {
2438 case MEM_PROT_NONE: p = PROT_NONE; break;
2439 case MEM_PROT_READ: p = PROT_READ; break;
2440 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2441 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2442 default:
2443 ShouldNotReachHere();
2444 }
2445 // is_committed is unused.
2446 return checked_mprotect(addr, size, p);
2447 }
2448
2449 bool os::guard_memory(char* addr, size_t size) {
2450 return checked_mprotect(addr, size, PROT_NONE);
2451 }
2452
2453 bool os::unguard_memory(char* addr, size_t size) {
2454 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2455 }
2456
2457 // Large page support
2458
2459 static size_t _large_page_size = 0;
2460
2461 // Enable large page support if OS allows that.
2462 void os::large_page_init() {
2463 return; // Nothing to do. See query_multipage_support and friends.
2464 }
2465
2466 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2467 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2468 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2469 // so this is not needed.
2470 assert(false, "should not be called on AIX");
2471 return NULL;
2472 }
2473
2474 bool os::release_memory_special(char* base, size_t bytes) {
2475 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2476 Unimplemented();
2477 return false;
2478 }
2479
2480 size_t os::large_page_size() {
2481 return _large_page_size;
2482 }
2483
2484 bool os::can_commit_large_page_memory() {
2485 // Does not matter, we do not support huge pages.
2486 return false;
2487 }
2488
2489 bool os::can_execute_large_page_memory() {
2490 // Does not matter, we do not support huge pages.
2491 return false;
2492 }
2493
2494 // Reserve memory at an arbitrary address, only if that area is
2495 // available (and not reserved for something else).
2496 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2497 char* addr = NULL;
2498
2499 // Always round to os::vm_page_size(), which may be larger than 4K.
2500 bytes = align_up(bytes, os::vm_page_size());
2501
2502 // In 4K mode always use mmap.
2503 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2504 if (os::vm_page_size() == 4*K) {
2505 return reserve_mmaped_memory(bytes, requested_addr, 0);
2506 } else {
2507 if (bytes >= Use64KPagesThreshold) {
2508 return reserve_shmated_memory(bytes, requested_addr, 0);
2509 } else {
2510 return reserve_mmaped_memory(bytes, requested_addr, 0);
2511 }
2512 }
2513
2514 return addr;
2515 }
2516
2517 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2518 return ::read(fd, buf, nBytes);
2519 }
2520
2521 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2522 return ::pread(fd, buf, nBytes, offset);
2523 }
2524
2525 void os::naked_short_sleep(jlong ms) {
2526 struct timespec req;
2527
2528 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2529 req.tv_sec = 0;
2530 if (ms > 0) {
2531 req.tv_nsec = (ms % 1000) * 1000000;
2532 }
2533 else {
2534 req.tv_nsec = 1;
2535 }
2536
2537 nanosleep(&req, NULL);
2538
2539 return;
2540 }
2541
2542 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2543 void os::infinite_sleep() {
2544 while (true) { // sleep forever ...
2545 ::sleep(100); // ... 100 seconds at a time
2546 }
2547 }
2548
2549 // Used to convert frequent JVM_Yield() to nops
2550 bool os::dont_yield() {
2551 return DontYieldALot;
2552 }
2553
2554 void os::naked_yield() {
2555 sched_yield();
2556 }
2557
2558 ////////////////////////////////////////////////////////////////////////////////
2559 // thread priority support
2560
2561 // From AIX manpage to pthread_setschedparam
2562 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2563 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2564 //
2565 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2566 // range from 40 to 80, where 40 is the least favored priority and 80
2567 // is the most favored."
2568 //
2569 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2570 // scheduling there; however, this still leaves iSeries.)
2571 //
2572 // We use the same values for AIX and PASE.
2573 int os::java_to_os_priority[CriticalPriority + 1] = {
2574 54, // 0 Entry should never be used
2575
2576 55, // 1 MinPriority
2577 55, // 2
2578 56, // 3
2579
2580 56, // 4
2581 57, // 5 NormPriority
2582 57, // 6
2583
2584 58, // 7
2585 58, // 8
2586 59, // 9 NearMaxPriority
2587
2588 60, // 10 MaxPriority
2589
2590 60 // 11 CriticalPriority
2591 };
2592
2593 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2594 if (!UseThreadPriorities) return OS_OK;
2595 pthread_t thr = thread->osthread()->pthread_id();
2596 int policy = SCHED_OTHER;
2597 struct sched_param param;
2598 param.sched_priority = newpri;
2599 int ret = pthread_setschedparam(thr, policy, ¶m);
2600
2601 if (ret != 0) {
2602 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2603 (int)thr, newpri, ret, os::errno_name(ret));
2604 }
2605 return (ret == 0) ? OS_OK : OS_ERR;
2606 }
2607
2608 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2609 if (!UseThreadPriorities) {
2610 *priority_ptr = java_to_os_priority[NormPriority];
2611 return OS_OK;
2612 }
2613 pthread_t thr = thread->osthread()->pthread_id();
2614 int policy = SCHED_OTHER;
2615 struct sched_param param;
2616 int ret = pthread_getschedparam(thr, &policy, ¶m);
2617 *priority_ptr = param.sched_priority;
2618
2619 return (ret == 0) ? OS_OK : OS_ERR;
2620 }
2621
2622 // Hint to the underlying OS that a task switch would not be good.
2623 // Void return because it's a hint and can fail.
2624 void os::hint_no_preempt() {}
2625
2626 ////////////////////////////////////////////////////////////////////////////////
2627 // suspend/resume support
2628
2629 // The low-level signal-based suspend/resume support is a remnant from the
2630 // old VM-suspension that used to be for java-suspension, safepoints etc,
2631 // within hotspot. Currently used by JFR's OSThreadSampler
2632 //
2633 // The remaining code is greatly simplified from the more general suspension
2634 // code that used to be used.
2635 //
2636 // The protocol is quite simple:
2637 // - suspend:
2638 // - sends a signal to the target thread
2639 // - polls the suspend state of the osthread using a yield loop
2640 // - target thread signal handler (SR_handler) sets suspend state
2641 // and blocks in sigsuspend until continued
2642 // - resume:
2643 // - sets target osthread state to continue
2644 // - sends signal to end the sigsuspend loop in the SR_handler
2645 //
2646 // Note that the SR_lock plays no role in this suspend/resume protocol,
2647 // but is checked for NULL in SR_handler as a thread termination indicator.
2648 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs.
2649 //
2650 // Note that resume_clear_context() and suspend_save_context() are needed
2651 // by SR_handler(), so that fetch_frame_from_ucontext() works,
2652 // which in part is used by:
2653 // - Forte Analyzer: AsyncGetCallTrace()
2654 // - StackBanging: get_frame_at_stack_banging_point()
2655
2656 static void resume_clear_context(OSThread *osthread) {
2657 osthread->set_ucontext(NULL);
2658 osthread->set_siginfo(NULL);
2659 }
2660
2661 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2662 osthread->set_ucontext(context);
2663 osthread->set_siginfo(siginfo);
2664 }
2665
2666 //
2667 // Handler function invoked when a thread's execution is suspended or
2668 // resumed. We have to be careful that only async-safe functions are
2669 // called here (Note: most pthread functions are not async safe and
2670 // should be avoided.)
2671 //
2672 // Note: sigwait() is a more natural fit than sigsuspend() from an
2673 // interface point of view, but sigwait() prevents the signal hander
2674 // from being run. libpthread would get very confused by not having
2675 // its signal handlers run and prevents sigwait()'s use with the
2676 // mutex granting granting signal.
2677 //
2678 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2679 //
2680 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2681 // Save and restore errno to avoid confusing native code with EINTR
2682 // after sigsuspend.
2683 int old_errno = errno;
2684
2685 Thread* thread = Thread::current_or_null_safe();
2686 assert(thread != NULL, "Missing current thread in SR_handler");
2687
2688 // On some systems we have seen signal delivery get "stuck" until the signal
2689 // mask is changed as part of thread termination. Check that the current thread
2690 // has not already terminated (via SR_lock()) - else the following assertion
2691 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2692 // destructor has completed.
2693
2694 if (thread->SR_lock() == NULL) {
2695 return;
2696 }
2697
2698 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2699
2700 OSThread* osthread = thread->osthread();
2701
2702 os::SuspendResume::State current = osthread->sr.state();
2703 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2704 suspend_save_context(osthread, siginfo, context);
2705
2706 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2707 os::SuspendResume::State state = osthread->sr.suspended();
2708 if (state == os::SuspendResume::SR_SUSPENDED) {
2709 sigset_t suspend_set; // signals for sigsuspend()
2710
2711 // get current set of blocked signals and unblock resume signal
2712 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2713 sigdelset(&suspend_set, SR_signum);
2714
2715 // wait here until we are resumed
2716 while (1) {
2717 sigsuspend(&suspend_set);
2718
2719 os::SuspendResume::State result = osthread->sr.running();
2720 if (result == os::SuspendResume::SR_RUNNING) {
2721 break;
2722 }
2723 }
2724
2725 } else if (state == os::SuspendResume::SR_RUNNING) {
2726 // request was cancelled, continue
2727 } else {
2728 ShouldNotReachHere();
2729 }
2730
2731 resume_clear_context(osthread);
2732 } else if (current == os::SuspendResume::SR_RUNNING) {
2733 // request was cancelled, continue
2734 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2735 // ignore
2736 } else {
2737 ShouldNotReachHere();
2738 }
2739
2740 errno = old_errno;
2741 }
2742
2743 static int SR_initialize() {
2744 struct sigaction act;
2745 char *s;
2746 // Get signal number to use for suspend/resume
2747 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2748 int sig = ::strtol(s, 0, 10);
2749 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2750 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2751 SR_signum = sig;
2752 } else {
2753 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2754 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2755 }
2756 }
2757
2758 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2759 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2760
2761 sigemptyset(&SR_sigset);
2762 sigaddset(&SR_sigset, SR_signum);
2763
2764 // Set up signal handler for suspend/resume.
2765 act.sa_flags = SA_RESTART|SA_SIGINFO;
2766 act.sa_handler = (void (*)(int)) SR_handler;
2767
2768 // SR_signum is blocked by default.
2769 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2770
2771 if (sigaction(SR_signum, &act, 0) == -1) {
2772 return -1;
2773 }
2774
2775 // Save signal flag
2776 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2777 return 0;
2778 }
2779
2780 static int SR_finalize() {
2781 return 0;
2782 }
2783
2784 static int sr_notify(OSThread* osthread) {
2785 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2786 assert_status(status == 0, status, "pthread_kill");
2787 return status;
2788 }
2789
2790 // "Randomly" selected value for how long we want to spin
2791 // before bailing out on suspending a thread, also how often
2792 // we send a signal to a thread we want to resume
2793 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2794 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2795
2796 // returns true on success and false on error - really an error is fatal
2797 // but this seems the normal response to library errors
2798 static bool do_suspend(OSThread* osthread) {
2799 assert(osthread->sr.is_running(), "thread should be running");
2800 // mark as suspended and send signal
2801
2802 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2803 // failed to switch, state wasn't running?
2804 ShouldNotReachHere();
2805 return false;
2806 }
2807
2808 if (sr_notify(osthread) != 0) {
2809 // try to cancel, switch to running
2810
2811 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2812 if (result == os::SuspendResume::SR_RUNNING) {
2813 // cancelled
2814 return false;
2815 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2816 // somehow managed to suspend
2817 return true;
2818 } else {
2819 ShouldNotReachHere();
2820 return false;
2821 }
2822 }
2823
2824 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2825
2826 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2827 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2828 os::naked_yield();
2829 }
2830
2831 // timeout, try to cancel the request
2832 if (n >= RANDOMLY_LARGE_INTEGER) {
2833 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2834 if (cancelled == os::SuspendResume::SR_RUNNING) {
2835 return false;
2836 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2837 return true;
2838 } else {
2839 ShouldNotReachHere();
2840 return false;
2841 }
2842 }
2843 }
2844
2845 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2846 return true;
2847 }
2848
2849 static void do_resume(OSThread* osthread) {
2850 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2851
2852 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2853 // failed to switch to WAKEUP_REQUEST
2854 ShouldNotReachHere();
2855 return;
2856 }
2857
2858 while (!osthread->sr.is_running()) {
2859 if (sr_notify(osthread) == 0) {
2860 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2861 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2862 os::naked_yield();
2863 }
2864 }
2865 } else {
2866 ShouldNotReachHere();
2867 }
2868 }
2869
2870 guarantee(osthread->sr.is_running(), "Must be running!");
2871 }
2872
2873 ///////////////////////////////////////////////////////////////////////////////////
2874 // signal handling (except suspend/resume)
2875
2876 // This routine may be used by user applications as a "hook" to catch signals.
2877 // The user-defined signal handler must pass unrecognized signals to this
2878 // routine, and if it returns true (non-zero), then the signal handler must
2879 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2880 // routine will never retun false (zero), but instead will execute a VM panic
2881 // routine kill the process.
2882 //
2883 // If this routine returns false, it is OK to call it again. This allows
2884 // the user-defined signal handler to perform checks either before or after
2885 // the VM performs its own checks. Naturally, the user code would be making
2886 // a serious error if it tried to handle an exception (such as a null check
2887 // or breakpoint) that the VM was generating for its own correct operation.
2888 //
2889 // This routine may recognize any of the following kinds of signals:
2890 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2891 // It should be consulted by handlers for any of those signals.
2892 //
2893 // The caller of this routine must pass in the three arguments supplied
2894 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2895 // field of the structure passed to sigaction(). This routine assumes that
2896 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2897 //
2898 // Note that the VM will print warnings if it detects conflicting signal
2899 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2900 //
2901 extern "C" JNIEXPORT int
2902 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2903
2904 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2905 // to be the thing to call; documentation is not terribly clear about whether
2906 // pthread_sigmask also works, and if it does, whether it does the same.
2907 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2908 const int rc = ::pthread_sigmask(how, set, oset);
2909 // return value semantics differ slightly for error case:
2910 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2911 // (so, pthread_sigmask is more theadsafe for error handling)
2912 // But success is always 0.
2913 return rc == 0 ? true : false;
2914 }
2915
2916 // Function to unblock all signals which are, according
2917 // to POSIX, typical program error signals. If they happen while being blocked,
2918 // they typically will bring down the process immediately.
2919 bool unblock_program_error_signals() {
2920 sigset_t set;
2921 ::sigemptyset(&set);
2922 ::sigaddset(&set, SIGILL);
2923 ::sigaddset(&set, SIGBUS);
2924 ::sigaddset(&set, SIGFPE);
2925 ::sigaddset(&set, SIGSEGV);
2926 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2927 }
2928
2929 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2930 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2931 assert(info != NULL && uc != NULL, "it must be old kernel");
2932
2933 // Never leave program error signals blocked;
2934 // on all our platforms they would bring down the process immediately when
2935 // getting raised while being blocked.
2936 unblock_program_error_signals();
2937
2938 int orig_errno = errno; // Preserve errno value over signal handler.
2939 JVM_handle_aix_signal(sig, info, uc, true);
2940 errno = orig_errno;
2941 }
2942
2943 // This boolean allows users to forward their own non-matching signals
2944 // to JVM_handle_aix_signal, harmlessly.
2945 bool os::Aix::signal_handlers_are_installed = false;
2946
2947 // For signal-chaining
2948 struct sigaction sigact[NSIG];
2949 sigset_t sigs;
2950 bool os::Aix::libjsig_is_loaded = false;
2951 typedef struct sigaction *(*get_signal_t)(int);
2952 get_signal_t os::Aix::get_signal_action = NULL;
2953
2954 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
2955 struct sigaction *actp = NULL;
2956
2957 if (libjsig_is_loaded) {
2958 // Retrieve the old signal handler from libjsig
2959 actp = (*get_signal_action)(sig);
2960 }
2961 if (actp == NULL) {
2962 // Retrieve the preinstalled signal handler from jvm
2963 actp = get_preinstalled_handler(sig);
2964 }
2965
2966 return actp;
2967 }
2968
2969 static bool call_chained_handler(struct sigaction *actp, int sig,
2970 siginfo_t *siginfo, void *context) {
2971 // Call the old signal handler
2972 if (actp->sa_handler == SIG_DFL) {
2973 // It's more reasonable to let jvm treat it as an unexpected exception
2974 // instead of taking the default action.
2975 return false;
2976 } else if (actp->sa_handler != SIG_IGN) {
2977 if ((actp->sa_flags & SA_NODEFER) == 0) {
2978 // automaticlly block the signal
2979 sigaddset(&(actp->sa_mask), sig);
2980 }
2981
2982 sa_handler_t hand = NULL;
2983 sa_sigaction_t sa = NULL;
2984 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
2985 // retrieve the chained handler
2986 if (siginfo_flag_set) {
2987 sa = actp->sa_sigaction;
2988 } else {
2989 hand = actp->sa_handler;
2990 }
2991
2992 if ((actp->sa_flags & SA_RESETHAND) != 0) {
2993 actp->sa_handler = SIG_DFL;
2994 }
2995
2996 // try to honor the signal mask
2997 sigset_t oset;
2998 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
2999
3000 // call into the chained handler
3001 if (siginfo_flag_set) {
3002 (*sa)(sig, siginfo, context);
3003 } else {
3004 (*hand)(sig);
3005 }
3006
3007 // restore the signal mask
3008 pthread_sigmask(SIG_SETMASK, &oset, 0);
3009 }
3010 // Tell jvm's signal handler the signal is taken care of.
3011 return true;
3012 }
3013
3014 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3015 bool chained = false;
3016 // signal-chaining
3017 if (UseSignalChaining) {
3018 struct sigaction *actp = get_chained_signal_action(sig);
3019 if (actp != NULL) {
3020 chained = call_chained_handler(actp, sig, siginfo, context);
3021 }
3022 }
3023 return chained;
3024 }
3025
3026 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3027 if (sigismember(&sigs, sig)) {
3028 return &sigact[sig];
3029 }
3030 return NULL;
3031 }
3032
3033 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3034 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3035 sigact[sig] = oldAct;
3036 sigaddset(&sigs, sig);
3037 }
3038
3039 // for diagnostic
3040 int sigflags[NSIG];
3041
3042 int os::Aix::get_our_sigflags(int sig) {
3043 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3044 return sigflags[sig];
3045 }
3046
3047 void os::Aix::set_our_sigflags(int sig, int flags) {
3048 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3049 if (sig > 0 && sig < NSIG) {
3050 sigflags[sig] = flags;
3051 }
3052 }
3053
3054 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3055 // Check for overwrite.
3056 struct sigaction oldAct;
3057 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3058
3059 void* oldhand = oldAct.sa_sigaction
3060 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3061 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3062 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3063 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3064 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3065 if (AllowUserSignalHandlers || !set_installed) {
3066 // Do not overwrite; user takes responsibility to forward to us.
3067 return;
3068 } else if (UseSignalChaining) {
3069 // save the old handler in jvm
3070 save_preinstalled_handler(sig, oldAct);
3071 // libjsig also interposes the sigaction() call below and saves the
3072 // old sigaction on it own.
3073 } else {
3074 fatal("Encountered unexpected pre-existing sigaction handler "
3075 "%#lx for signal %d.", (long)oldhand, sig);
3076 }
3077 }
3078
3079 struct sigaction sigAct;
3080 sigfillset(&(sigAct.sa_mask));
3081 if (!set_installed) {
3082 sigAct.sa_handler = SIG_DFL;
3083 sigAct.sa_flags = SA_RESTART;
3084 } else {
3085 sigAct.sa_sigaction = javaSignalHandler;
3086 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3087 }
3088 // Save flags, which are set by ours
3089 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3090 sigflags[sig] = sigAct.sa_flags;
3091
3092 int ret = sigaction(sig, &sigAct, &oldAct);
3093 assert(ret == 0, "check");
3094
3095 void* oldhand2 = oldAct.sa_sigaction
3096 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3097 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3098 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3099 }
3100
3101 // install signal handlers for signals that HotSpot needs to
3102 // handle in order to support Java-level exception handling.
3103 void os::Aix::install_signal_handlers() {
3104 if (!signal_handlers_are_installed) {
3105 signal_handlers_are_installed = true;
3106
3107 // signal-chaining
3108 typedef void (*signal_setting_t)();
3109 signal_setting_t begin_signal_setting = NULL;
3110 signal_setting_t end_signal_setting = NULL;
3111 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3112 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3113 if (begin_signal_setting != NULL) {
3114 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3115 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3116 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3117 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3118 libjsig_is_loaded = true;
3119 assert(UseSignalChaining, "should enable signal-chaining");
3120 }
3121 if (libjsig_is_loaded) {
3122 // Tell libjsig jvm is setting signal handlers.
3123 (*begin_signal_setting)();
3124 }
3125
3126 ::sigemptyset(&sigs);
3127 set_signal_handler(SIGSEGV, true);
3128 set_signal_handler(SIGPIPE, true);
3129 set_signal_handler(SIGBUS, true);
3130 set_signal_handler(SIGILL, true);
3131 set_signal_handler(SIGFPE, true);
3132 set_signal_handler(SIGTRAP, true);
3133 set_signal_handler(SIGXFSZ, true);
3134
3135 if (libjsig_is_loaded) {
3136 // Tell libjsig jvm finishes setting signal handlers.
3137 (*end_signal_setting)();
3138 }
3139
3140 // We don't activate signal checker if libjsig is in place, we trust ourselves
3141 // and if UserSignalHandler is installed all bets are off.
3142 // Log that signal checking is off only if -verbose:jni is specified.
3143 if (CheckJNICalls) {
3144 if (libjsig_is_loaded) {
3145 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3146 check_signals = false;
3147 }
3148 if (AllowUserSignalHandlers) {
3149 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3150 check_signals = false;
3151 }
3152 // Need to initialize check_signal_done.
3153 ::sigemptyset(&check_signal_done);
3154 }
3155 }
3156 }
3157
3158 static const char* get_signal_handler_name(address handler,
3159 char* buf, int buflen) {
3160 int offset;
3161 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3162 if (found) {
3163 // skip directory names
3164 const char *p1, *p2;
3165 p1 = buf;
3166 size_t len = strlen(os::file_separator());
3167 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3168 // The way os::dll_address_to_library_name is implemented on Aix
3169 // right now, it always returns -1 for the offset which is not
3170 // terribly informative.
3171 // Will fix that. For now, omit the offset.
3172 jio_snprintf(buf, buflen, "%s", p1);
3173 } else {
3174 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3175 }
3176 return buf;
3177 }
3178
3179 static void print_signal_handler(outputStream* st, int sig,
3180 char* buf, size_t buflen) {
3181 struct sigaction sa;
3182 sigaction(sig, NULL, &sa);
3183
3184 st->print("%s: ", os::exception_name(sig, buf, buflen));
3185
3186 address handler = (sa.sa_flags & SA_SIGINFO)
3187 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3188 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3189
3190 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3191 st->print("SIG_DFL");
3192 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3193 st->print("SIG_IGN");
3194 } else {
3195 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3196 }
3197
3198 // Print readable mask.
3199 st->print(", sa_mask[0]=");
3200 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3201
3202 address rh = VMError::get_resetted_sighandler(sig);
3203 // May be, handler was resetted by VMError?
3204 if (rh != NULL) {
3205 handler = rh;
3206 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3207 }
3208
3209 // Print textual representation of sa_flags.
3210 st->print(", sa_flags=");
3211 os::Posix::print_sa_flags(st, sa.sa_flags);
3212
3213 // Check: is it our handler?
3214 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3215 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3216 // It is our signal handler.
3217 // Check for flags, reset system-used one!
3218 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3219 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3220 os::Aix::get_our_sigflags(sig));
3221 }
3222 }
3223 st->cr();
3224 }
3225
3226 #define DO_SIGNAL_CHECK(sig) \
3227 if (!sigismember(&check_signal_done, sig)) \
3228 os::Aix::check_signal_handler(sig)
3229
3230 // This method is a periodic task to check for misbehaving JNI applications
3231 // under CheckJNI, we can add any periodic checks here
3232
3233 void os::run_periodic_checks() {
3234
3235 if (check_signals == false) return;
3236
3237 // SEGV and BUS if overridden could potentially prevent
3238 // generation of hs*.log in the event of a crash, debugging
3239 // such a case can be very challenging, so we absolutely
3240 // check the following for a good measure:
3241 DO_SIGNAL_CHECK(SIGSEGV);
3242 DO_SIGNAL_CHECK(SIGILL);
3243 DO_SIGNAL_CHECK(SIGFPE);
3244 DO_SIGNAL_CHECK(SIGBUS);
3245 DO_SIGNAL_CHECK(SIGPIPE);
3246 DO_SIGNAL_CHECK(SIGXFSZ);
3247 if (UseSIGTRAP) {
3248 DO_SIGNAL_CHECK(SIGTRAP);
3249 }
3250
3251 // ReduceSignalUsage allows the user to override these handlers
3252 // see comments at the very top and jvm_solaris.h
3253 if (!ReduceSignalUsage) {
3254 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3255 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3256 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3257 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3258 }
3259
3260 DO_SIGNAL_CHECK(SR_signum);
3261 }
3262
3263 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3264
3265 static os_sigaction_t os_sigaction = NULL;
3266
3267 void os::Aix::check_signal_handler(int sig) {
3268 char buf[O_BUFLEN];
3269 address jvmHandler = NULL;
3270
3271 struct sigaction act;
3272 if (os_sigaction == NULL) {
3273 // only trust the default sigaction, in case it has been interposed
3274 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3275 if (os_sigaction == NULL) return;
3276 }
3277
3278 os_sigaction(sig, (struct sigaction*)NULL, &act);
3279
3280 address thisHandler = (act.sa_flags & SA_SIGINFO)
3281 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3282 : CAST_FROM_FN_PTR(address, act.sa_handler);
3283
3284 switch(sig) {
3285 case SIGSEGV:
3286 case SIGBUS:
3287 case SIGFPE:
3288 case SIGPIPE:
3289 case SIGILL:
3290 case SIGXFSZ:
3291 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3292 break;
3293
3294 case SHUTDOWN1_SIGNAL:
3295 case SHUTDOWN2_SIGNAL:
3296 case SHUTDOWN3_SIGNAL:
3297 case BREAK_SIGNAL:
3298 jvmHandler = (address)user_handler();
3299 break;
3300
3301 default:
3302 if (sig == SR_signum) {
3303 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3304 } else {
3305 return;
3306 }
3307 break;
3308 }
3309
3310 if (thisHandler != jvmHandler) {
3311 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3312 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3313 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3314 // No need to check this sig any longer
3315 sigaddset(&check_signal_done, sig);
3316 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3317 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3318 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3319 exception_name(sig, buf, O_BUFLEN));
3320 }
3321 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3322 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3323 tty->print("expected:");
3324 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3325 tty->cr();
3326 tty->print(" found:");
3327 os::Posix::print_sa_flags(tty, act.sa_flags);
3328 tty->cr();
3329 // No need to check this sig any longer
3330 sigaddset(&check_signal_done, sig);
3331 }
3332
3333 // Dump all the signal
3334 if (sigismember(&check_signal_done, sig)) {
3335 print_signal_handlers(tty, buf, O_BUFLEN);
3336 }
3337 }
3338
3339 // To install functions for atexit system call
3340 extern "C" {
3341 static void perfMemory_exit_helper() {
3342 perfMemory_exit();
3343 }
3344 }
3345
3346 // This is called _before_ the most of global arguments have been parsed.
3347 void os::init(void) {
3348 // This is basic, we want to know if that ever changes.
3349 // (Shared memory boundary is supposed to be a 256M aligned.)
3350 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3351
3352 // Record process break at startup.
3353 g_brk_at_startup = (address) ::sbrk(0);
3354 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3355
3356 // First off, we need to know whether we run on AIX or PASE, and
3357 // the OS level we run on.
3358 os::Aix::initialize_os_info();
3359
3360 // Scan environment (SPEC1170 behaviour, etc).
3361 os::Aix::scan_environment();
3362
3363 // Probe multipage support.
3364 query_multipage_support();
3365
3366 // Act like we only have one page size by eliminating corner cases which
3367 // we did not support very well anyway.
3368 // We have two input conditions:
3369 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3370 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3371 // setting.
3372 // Data segment page size is important for us because it defines the thread stack page
3373 // size, which is needed for guard page handling, stack banging etc.
3374 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3375 // and should be allocated with 64k pages.
3376 //
3377 // So, we do the following:
3378 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3379 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3380 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3381 // 64k no --- AIX 5.2 ? ---
3382 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3383
3384 // We explicitly leave no option to change page size, because only upgrading would work,
3385 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3386
3387 if (g_multipage_support.datapsize == 4*K) {
3388 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3389 if (g_multipage_support.can_use_64K_pages) {
3390 // .. but we are able to use 64K pages dynamically.
3391 // This would be typical for java launchers which are not linked
3392 // with datapsize=64K (like, any other launcher but our own).
3393 //
3394 // In this case it would be smart to allocate the java heap with 64K
3395 // to get the performance benefit, and to fake 64k pages for the
3396 // data segment (when dealing with thread stacks).
3397 //
3398 // However, leave a possibility to downgrade to 4K, using
3399 // -XX:-Use64KPages.
3400 if (Use64KPages) {
3401 trcVerbose("64K page mode (faked for data segment)");
3402 Aix::_page_size = 64*K;
3403 } else {
3404 trcVerbose("4K page mode (Use64KPages=off)");
3405 Aix::_page_size = 4*K;
3406 }
3407 } else {
3408 // .. and not able to allocate 64k pages dynamically. Here, just
3409 // fall back to 4K paged mode and use mmap for everything.
3410 trcVerbose("4K page mode");
3411 Aix::_page_size = 4*K;
3412 FLAG_SET_ERGO(bool, Use64KPages, false);
3413 }
3414 } else {
3415 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3416 // This normally means that we can allocate 64k pages dynamically.
3417 // (There is one special case where this may be false: EXTSHM=on.
3418 // but we decided to not support that mode).
3419 assert0(g_multipage_support.can_use_64K_pages);
3420 Aix::_page_size = 64*K;
3421 trcVerbose("64K page mode");
3422 FLAG_SET_ERGO(bool, Use64KPages, true);
3423 }
3424
3425 // For now UseLargePages is just ignored.
3426 FLAG_SET_ERGO(bool, UseLargePages, false);
3427 _page_sizes[0] = 0;
3428
3429 // debug trace
3430 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3431
3432 // Next, we need to initialize libo4 and libperfstat libraries.
3433 if (os::Aix::on_pase()) {
3434 os::Aix::initialize_libo4();
3435 } else {
3436 os::Aix::initialize_libperfstat();
3437 }
3438
3439 // Reset the perfstat information provided by ODM.
3440 if (os::Aix::on_aix()) {
3441 libperfstat::perfstat_reset();
3442 }
3443
3444 // Now initialze basic system properties. Note that for some of the values we
3445 // need libperfstat etc.
3446 os::Aix::initialize_system_info();
3447
3448 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3449
3450 init_random(1234567);
3451
3452 // Main_thread points to the aboriginal thread.
3453 Aix::_main_thread = pthread_self();
3454
3455 initial_time_count = os::elapsed_counter();
3456
3457 os::Posix::init();
3458 }
3459
3460 // This is called _after_ the global arguments have been parsed.
3461 jint os::init_2(void) {
3462
3463 os::Posix::init_2();
3464
3465 if (os::Aix::on_pase()) {
3466 trcVerbose("Running on PASE.");
3467 } else {
3468 trcVerbose("Running on AIX (not PASE).");
3469 }
3470
3471 trcVerbose("processor count: %d", os::_processor_count);
3472 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3473
3474 // Initially build up the loaded dll map.
3475 LoadedLibraries::reload();
3476 if (Verbose) {
3477 trcVerbose("Loaded Libraries: ");
3478 LoadedLibraries::print(tty);
3479 }
3480
3481 // initialize suspend/resume support - must do this before signal_sets_init()
3482 if (SR_initialize() != 0) {
3483 perror("SR_initialize failed");
3484 return JNI_ERR;
3485 }
3486
3487 Aix::signal_sets_init();
3488 Aix::install_signal_handlers();
3489
3490 // Check and sets minimum stack sizes against command line options
3491 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3492 return JNI_ERR;
3493 }
3494
3495 if (UseNUMA) {
3496 UseNUMA = false;
3497 warning("NUMA optimizations are not available on this OS.");
3498 }
3499
3500 if (MaxFDLimit) {
3501 // Set the number of file descriptors to max. print out error
3502 // if getrlimit/setrlimit fails but continue regardless.
3503 struct rlimit nbr_files;
3504 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3505 if (status != 0) {
3506 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3507 } else {
3508 nbr_files.rlim_cur = nbr_files.rlim_max;
3509 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3510 if (status != 0) {
3511 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3512 }
3513 }
3514 }
3515
3516 if (PerfAllowAtExitRegistration) {
3517 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3518 // At exit functions can be delayed until process exit time, which
3519 // can be problematic for embedded VM situations. Embedded VMs should
3520 // call DestroyJavaVM() to assure that VM resources are released.
3521
3522 // Note: perfMemory_exit_helper atexit function may be removed in
3523 // the future if the appropriate cleanup code can be added to the
3524 // VM_Exit VMOperation's doit method.
3525 if (atexit(perfMemory_exit_helper) != 0) {
3526 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3527 }
3528 }
3529
3530 return JNI_OK;
3531 }
3532
3533 // Mark the polling page as unreadable
3534 void os::make_polling_page_unreadable(void) {
3535 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3536 fatal("Could not disable polling page");
3537 }
3538 };
3539
3540 // Mark the polling page as readable
3541 void os::make_polling_page_readable(void) {
3542 // Changed according to os_linux.cpp.
3543 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3544 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3545 }
3546 };
3547
3548 int os::active_processor_count() {
3549 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3550 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3551 return online_cpus;
3552 }
3553
3554 void os::set_native_thread_name(const char *name) {
3555 // Not yet implemented.
3556 return;
3557 }
3558
3559 bool os::distribute_processes(uint length, uint* distribution) {
3560 // Not yet implemented.
3561 return false;
3562 }
3563
3564 bool os::bind_to_processor(uint processor_id) {
3565 // Not yet implemented.
3566 return false;
3567 }
3568
3569 void os::SuspendedThreadTask::internal_do_task() {
3570 if (do_suspend(_thread->osthread())) {
3571 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3572 do_task(context);
3573 do_resume(_thread->osthread());
3574 }
3575 }
3576
3577 ////////////////////////////////////////////////////////////////////////////////
3578 // debug support
3579
3580 bool os::find(address addr, outputStream* st) {
3581
3582 st->print(PTR_FORMAT ": ", addr);
3583
3584 loaded_module_t lm;
3585 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3586 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3587 st->print_cr("%s", lm.path);
3588 return true;
3589 }
3590
3591 return false;
3592 }
3593
3594 ////////////////////////////////////////////////////////////////////////////////
3595 // misc
3596
3597 // This does not do anything on Aix. This is basically a hook for being
3598 // able to use structured exception handling (thread-local exception filters)
3599 // on, e.g., Win32.
3600 void
3601 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3602 JavaCallArguments* args, Thread* thread) {
3603 f(value, method, args, thread);
3604 }
3605
3606 void os::print_statistics() {
3607 }
3608
3609 bool os::message_box(const char* title, const char* message) {
3610 int i;
3611 fdStream err(defaultStream::error_fd());
3612 for (i = 0; i < 78; i++) err.print_raw("=");
3613 err.cr();
3614 err.print_raw_cr(title);
3615 for (i = 0; i < 78; i++) err.print_raw("-");
3616 err.cr();
3617 err.print_raw_cr(message);
3618 for (i = 0; i < 78; i++) err.print_raw("=");
3619 err.cr();
3620
3621 char buf[16];
3622 // Prevent process from exiting upon "read error" without consuming all CPU
3623 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3624
3625 return buf[0] == 'y' || buf[0] == 'Y';
3626 }
3627
3628 int os::stat(const char *path, struct stat *sbuf) {
3629 char pathbuf[MAX_PATH];
3630 if (strlen(path) > MAX_PATH - 1) {
3631 errno = ENAMETOOLONG;
3632 return -1;
3633 }
3634 os::native_path(strcpy(pathbuf, path));
3635 return ::stat(pathbuf, sbuf);
3636 }
3637
3638 // Is a (classpath) directory empty?
3639 bool os::dir_is_empty(const char* path) {
3640 DIR *dir = NULL;
3641 struct dirent *ptr;
3642
3643 dir = opendir(path);
3644 if (dir == NULL) return true;
3645
3646 /* Scan the directory */
3647 bool result = true;
3648 char buf[sizeof(struct dirent) + MAX_PATH];
3649 while (result && (ptr = ::readdir(dir)) != NULL) {
3650 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3651 result = false;
3652 }
3653 }
3654 closedir(dir);
3655 return result;
3656 }
3657
3658 // This code originates from JDK's sysOpen and open64_w
3659 // from src/solaris/hpi/src/system_md.c
3660
3661 int os::open(const char *path, int oflag, int mode) {
3662
3663 if (strlen(path) > MAX_PATH - 1) {
3664 errno = ENAMETOOLONG;
3665 return -1;
3666 }
3667 int fd;
3668
3669 fd = ::open64(path, oflag, mode);
3670 if (fd == -1) return -1;
3671
3672 // If the open succeeded, the file might still be a directory.
3673 {
3674 struct stat64 buf64;
3675 int ret = ::fstat64(fd, &buf64);
3676 int st_mode = buf64.st_mode;
3677
3678 if (ret != -1) {
3679 if ((st_mode & S_IFMT) == S_IFDIR) {
3680 errno = EISDIR;
3681 ::close(fd);
3682 return -1;
3683 }
3684 } else {
3685 ::close(fd);
3686 return -1;
3687 }
3688 }
3689
3690 // All file descriptors that are opened in the JVM and not
3691 // specifically destined for a subprocess should have the
3692 // close-on-exec flag set. If we don't set it, then careless 3rd
3693 // party native code might fork and exec without closing all
3694 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3695 // UNIXProcess.c), and this in turn might:
3696 //
3697 // - cause end-of-file to fail to be detected on some file
3698 // descriptors, resulting in mysterious hangs, or
3699 //
3700 // - might cause an fopen in the subprocess to fail on a system
3701 // suffering from bug 1085341.
3702 //
3703 // (Yes, the default setting of the close-on-exec flag is a Unix
3704 // design flaw.)
3705 //
3706 // See:
3707 // 1085341: 32-bit stdio routines should support file descriptors >255
3708 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3709 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3710 #ifdef FD_CLOEXEC
3711 {
3712 int flags = ::fcntl(fd, F_GETFD);
3713 if (flags != -1)
3714 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3715 }
3716 #endif
3717
3718 return fd;
3719 }
3720
3721 // create binary file, rewriting existing file if required
3722 int os::create_binary_file(const char* path, bool rewrite_existing) {
3723 int oflags = O_WRONLY | O_CREAT;
3724 if (!rewrite_existing) {
3725 oflags |= O_EXCL;
3726 }
3727 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3728 }
3729
3730 // return current position of file pointer
3731 jlong os::current_file_offset(int fd) {
3732 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3733 }
3734
3735 // move file pointer to the specified offset
3736 jlong os::seek_to_file_offset(int fd, jlong offset) {
3737 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3738 }
3739
3740 // This code originates from JDK's sysAvailable
3741 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3742
3743 int os::available(int fd, jlong *bytes) {
3744 jlong cur, end;
3745 int mode;
3746 struct stat64 buf64;
3747
3748 if (::fstat64(fd, &buf64) >= 0) {
3749 mode = buf64.st_mode;
3750 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3751 int n;
3752 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3753 *bytes = n;
3754 return 1;
3755 }
3756 }
3757 }
3758 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3759 return 0;
3760 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3761 return 0;
3762 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3763 return 0;
3764 }
3765 *bytes = end - cur;
3766 return 1;
3767 }
3768
3769 // Map a block of memory.
3770 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3771 char *addr, size_t bytes, bool read_only,
3772 bool allow_exec) {
3773 int prot;
3774 int flags = MAP_PRIVATE;
3775
3776 if (read_only) {
3777 prot = PROT_READ;
3778 flags = MAP_SHARED;
3779 } else {
3780 prot = PROT_READ | PROT_WRITE;
3781 flags = MAP_PRIVATE;
3782 }
3783
3784 if (allow_exec) {
3785 prot |= PROT_EXEC;
3786 }
3787
3788 if (addr != NULL) {
3789 flags |= MAP_FIXED;
3790 }
3791
3792 // Allow anonymous mappings if 'fd' is -1.
3793 if (fd == -1) {
3794 flags |= MAP_ANONYMOUS;
3795 }
3796
3797 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3798 fd, file_offset);
3799 if (mapped_address == MAP_FAILED) {
3800 return NULL;
3801 }
3802 return mapped_address;
3803 }
3804
3805 // Remap a block of memory.
3806 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3807 char *addr, size_t bytes, bool read_only,
3808 bool allow_exec) {
3809 // same as map_memory() on this OS
3810 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3811 allow_exec);
3812 }
3813
3814 // Unmap a block of memory.
3815 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3816 return munmap(addr, bytes) == 0;
3817 }
3818
3819 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3820 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3821 // of a thread.
3822 //
3823 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3824 // the fast estimate available on the platform.
3825
3826 jlong os::current_thread_cpu_time() {
3827 // return user + sys since the cost is the same
3828 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3829 assert(n >= 0, "negative CPU time");
3830 return n;
3831 }
3832
3833 jlong os::thread_cpu_time(Thread* thread) {
3834 // consistent with what current_thread_cpu_time() returns
3835 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3836 assert(n >= 0, "negative CPU time");
3837 return n;
3838 }
3839
3840 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3841 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3842 assert(n >= 0, "negative CPU time");
3843 return n;
3844 }
3845
3846 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3847 bool error = false;
3848
3849 jlong sys_time = 0;
3850 jlong user_time = 0;
3851
3852 // Reimplemented using getthrds64().
3853 //
3854 // Works like this:
3855 // For the thread in question, get the kernel thread id. Then get the
3856 // kernel thread statistics using that id.
3857 //
3858 // This only works of course when no pthread scheduling is used,
3859 // i.e. there is a 1:1 relationship to kernel threads.
3860 // On AIX, see AIXTHREAD_SCOPE variable.
3861
3862 pthread_t pthtid = thread->osthread()->pthread_id();
3863
3864 // retrieve kernel thread id for the pthread:
3865 tid64_t tid = 0;
3866 struct __pthrdsinfo pinfo;
3867 // I just love those otherworldly IBM APIs which force me to hand down
3868 // dummy buffers for stuff I dont care for...
3869 char dummy[1];
3870 int dummy_size = sizeof(dummy);
3871 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
3872 dummy, &dummy_size) == 0) {
3873 tid = pinfo.__pi_tid;
3874 } else {
3875 tty->print_cr("pthread_getthrds_np failed.");
3876 error = true;
3877 }
3878
3879 // retrieve kernel timing info for that kernel thread
3880 if (!error) {
3881 struct thrdentry64 thrdentry;
3882 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
3883 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
3884 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
3885 } else {
3886 tty->print_cr("pthread_getthrds_np failed.");
3887 error = true;
3888 }
3889 }
3890
3891 if (p_sys_time) {
3892 *p_sys_time = sys_time;
3893 }
3894
3895 if (p_user_time) {
3896 *p_user_time = user_time;
3897 }
3898
3899 if (error) {
3900 return false;
3901 }
3902
3903 return true;
3904 }
3905
3906 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
3907 jlong sys_time;
3908 jlong user_time;
3909
3910 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
3911 return -1;
3912 }
3913
3914 return user_sys_cpu_time ? sys_time + user_time : user_time;
3915 }
3916
3917 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3918 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3919 info_ptr->may_skip_backward = false; // elapsed time not wall time
3920 info_ptr->may_skip_forward = false; // elapsed time not wall time
3921 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3922 }
3923
3924 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
3925 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
3926 info_ptr->may_skip_backward = false; // elapsed time not wall time
3927 info_ptr->may_skip_forward = false; // elapsed time not wall time
3928 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
3929 }
3930
3931 bool os::is_thread_cpu_time_supported() {
3932 return true;
3933 }
3934
3935 // System loadavg support. Returns -1 if load average cannot be obtained.
3936 // For now just return the system wide load average (no processor sets).
3937 int os::loadavg(double values[], int nelem) {
3938
3939 guarantee(nelem >= 0 && nelem <= 3, "argument error");
3940 guarantee(values, "argument error");
3941
3942 if (os::Aix::on_pase()) {
3943
3944 // AS/400 PASE: use libo4 porting library
3945 double v[3] = { 0.0, 0.0, 0.0 };
3946
3947 if (libo4::get_load_avg(v, v + 1, v + 2)) {
3948 for (int i = 0; i < nelem; i ++) {
3949 values[i] = v[i];
3950 }
3951 return nelem;
3952 } else {
3953 return -1;
3954 }
3955
3956 } else {
3957
3958 // AIX: use libperfstat
3959 libperfstat::cpuinfo_t ci;
3960 if (libperfstat::get_cpuinfo(&ci)) {
3961 for (int i = 0; i < nelem; i++) {
3962 values[i] = ci.loadavg[i];
3963 }
3964 } else {
3965 return -1;
3966 }
3967 return nelem;
3968 }
3969 }
3970
3971 void os::pause() {
3972 char filename[MAX_PATH];
3973 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
3974 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
3975 } else {
3976 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
3977 }
3978
3979 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
3980 if (fd != -1) {
3981 struct stat buf;
3982 ::close(fd);
3983 while (::stat(filename, &buf) == 0) {
3984 (void)::poll(NULL, 0, 100);
3985 }
3986 } else {
3987 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
3988 }
3989 }
3990
3991 bool os::Aix::is_primordial_thread() {
3992 if (pthread_self() == (pthread_t)1) {
3993 return true;
3994 } else {
3995 return false;
3996 }
3997 }
3998
3999 // OS recognitions (PASE/AIX, OS level) call this before calling any
4000 // one of Aix::on_pase(), Aix::os_version() static
4001 void os::Aix::initialize_os_info() {
4002
4003 assert(_on_pase == -1 && _os_version == 0, "already called.");
4004
4005 struct utsname uts;
4006 memset(&uts, 0, sizeof(uts));
4007 strcpy(uts.sysname, "?");
4008 if (::uname(&uts) == -1) {
4009 trcVerbose("uname failed (%d)", errno);
4010 guarantee(0, "Could not determine whether we run on AIX or PASE");
4011 } else {
4012 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4013 "node \"%s\" machine \"%s\"\n",
4014 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4015 const int major = atoi(uts.version);
4016 assert(major > 0, "invalid OS version");
4017 const int minor = atoi(uts.release);
4018 assert(minor > 0, "invalid OS release");
4019 _os_version = (major << 24) | (minor << 16);
4020 char ver_str[20] = {0};
4021 char *name_str = "unknown OS";
4022 if (strcmp(uts.sysname, "OS400") == 0) {
4023 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4024 _on_pase = 1;
4025 if (os_version_short() < 0x0504) {
4026 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4027 assert(false, "OS/400 release too old.");
4028 }
4029 name_str = "OS/400 (pase)";
4030 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4031 } else if (strcmp(uts.sysname, "AIX") == 0) {
4032 // We run on AIX. We do not support versions older than AIX 5.3.
4033 _on_pase = 0;
4034 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4035 odmWrapper::determine_os_kernel_version(&_os_version);
4036 if (os_version_short() < 0x0503) {
4037 trcVerbose("AIX release older than AIX 5.3 not supported.");
4038 assert(false, "AIX release too old.");
4039 }
4040 name_str = "AIX";
4041 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4042 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4043 } else {
4044 assert(false, name_str);
4045 }
4046 trcVerbose("We run on %s %s", name_str, ver_str);
4047 }
4048
4049 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4050 } // end: os::Aix::initialize_os_info()
4051
4052 // Scan environment for important settings which might effect the VM.
4053 // Trace out settings. Warn about invalid settings and/or correct them.
4054 //
4055 // Must run after os::Aix::initialue_os_info().
4056 void os::Aix::scan_environment() {
4057
4058 char* p;
4059 int rc;
4060
4061 // Warn explicity if EXTSHM=ON is used. That switch changes how
4062 // System V shared memory behaves. One effect is that page size of
4063 // shared memory cannot be change dynamically, effectivly preventing
4064 // large pages from working.
4065 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4066 // recommendation is (in OSS notes) to switch it off.
4067 p = ::getenv("EXTSHM");
4068 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4069 if (p && strcasecmp(p, "ON") == 0) {
4070 _extshm = 1;
4071 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4072 if (!AllowExtshm) {
4073 // We allow under certain conditions the user to continue. However, we want this
4074 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4075 // that the VM is not able to allocate 64k pages for the heap.
4076 // We do not want to run with reduced performance.
4077 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4078 }
4079 } else {
4080 _extshm = 0;
4081 }
4082
4083 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4084 // Not tested, not supported.
4085 //
4086 // Note that it might be worth the trouble to test and to require it, if only to
4087 // get useful return codes for mprotect.
4088 //
4089 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4090 // exec() ? before loading the libjvm ? ....)
4091 p = ::getenv("XPG_SUS_ENV");
4092 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4093 if (p && strcmp(p, "ON") == 0) {
4094 _xpg_sus_mode = 1;
4095 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4096 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4097 // clobber address ranges. If we ever want to support that, we have to do some
4098 // testing first.
4099 guarantee(false, "XPG_SUS_ENV=ON not supported");
4100 } else {
4101 _xpg_sus_mode = 0;
4102 }
4103
4104 if (os::Aix::on_pase()) {
4105 p = ::getenv("QIBM_MULTI_THREADED");
4106 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4107 }
4108
4109 p = ::getenv("LDR_CNTRL");
4110 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4111 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4112 if (p && ::strstr(p, "TEXTPSIZE")) {
4113 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4114 "you may experience hangs or crashes on OS/400 V7R1.");
4115 }
4116 }
4117
4118 p = ::getenv("AIXTHREAD_GUARDPAGES");
4119 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4120
4121 } // end: os::Aix::scan_environment()
4122
4123 // PASE: initialize the libo4 library (PASE porting library).
4124 void os::Aix::initialize_libo4() {
4125 guarantee(os::Aix::on_pase(), "OS/400 only.");
4126 if (!libo4::init()) {
4127 trcVerbose("libo4 initialization failed.");
4128 assert(false, "libo4 initialization failed");
4129 } else {
4130 trcVerbose("libo4 initialized.");
4131 }
4132 }
4133
4134 // AIX: initialize the libperfstat library.
4135 void os::Aix::initialize_libperfstat() {
4136 assert(os::Aix::on_aix(), "AIX only");
4137 if (!libperfstat::init()) {
4138 trcVerbose("libperfstat initialization failed.");
4139 assert(false, "libperfstat initialization failed");
4140 } else {
4141 trcVerbose("libperfstat initialized.");
4142 }
4143 }
4144
4145 /////////////////////////////////////////////////////////////////////////////
4146 // thread stack
4147
4148 // Get the current stack base from the OS (actually, the pthread library).
4149 // Note: usually not page aligned.
4150 address os::current_stack_base() {
4151 AixMisc::stackbounds_t bounds;
4152 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4153 guarantee(rc, "Unable to retrieve stack bounds.");
4154 return bounds.base;
4155 }
4156
4157 // Get the current stack size from the OS (actually, the pthread library).
4158 // Returned size is such that (base - size) is always aligned to page size.
4159 size_t os::current_stack_size() {
4160 AixMisc::stackbounds_t bounds;
4161 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4162 guarantee(rc, "Unable to retrieve stack bounds.");
4163 // Align the returned stack size such that the stack low address
4164 // is aligned to page size (Note: base is usually not and we do not care).
4165 // We need to do this because caller code will assume stack low address is
4166 // page aligned and will place guard pages without checking.
4167 address low = bounds.base - bounds.size;
4168 address low_aligned = (address)align_up(low, os::vm_page_size());
4169 size_t s = bounds.base - low_aligned;
4170 return s;
4171 }
4172
4173 extern char** environ;
4174
4175 // Run the specified command in a separate process. Return its exit value,
4176 // or -1 on failure (e.g. can't fork a new process).
4177 // Unlike system(), this function can be called from signal handler. It
4178 // doesn't block SIGINT et al.
4179 int os::fork_and_exec(char* cmd) {
4180 char * argv[4] = {"sh", "-c", cmd, NULL};
4181
4182 pid_t pid = fork();
4183
4184 if (pid < 0) {
4185 // fork failed
4186 return -1;
4187
4188 } else if (pid == 0) {
4189 // child process
4190
4191 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4192 execve("/usr/bin/sh", argv, environ);
4193
4194 // execve failed
4195 _exit(-1);
4196
4197 } else {
4198 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4199 // care about the actual exit code, for now.
4200
4201 int status;
4202
4203 // Wait for the child process to exit. This returns immediately if
4204 // the child has already exited. */
4205 while (waitpid(pid, &status, 0) < 0) {
4206 switch (errno) {
4207 case ECHILD: return 0;
4208 case EINTR: break;
4209 default: return -1;
4210 }
4211 }
4212
4213 if (WIFEXITED(status)) {
4214 // The child exited normally; get its exit code.
4215 return WEXITSTATUS(status);
4216 } else if (WIFSIGNALED(status)) {
4217 // The child exited because of a signal.
4218 // The best value to return is 0x80 + signal number,
4219 // because that is what all Unix shells do, and because
4220 // it allows callers to distinguish between process exit and
4221 // process death by signal.
4222 return 0x80 + WTERMSIG(status);
4223 } else {
4224 // Unknown exit code; pass it through.
4225 return status;
4226 }
4227 }
4228 return -1;
4229 }
4230
4231 // is_headless_jre()
4232 //
4233 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4234 // in order to report if we are running in a headless jre.
4235 //
4236 // Since JDK8 xawt/libmawt.so is moved into the same directory
4237 // as libawt.so, and renamed libawt_xawt.so
4238 bool os::is_headless_jre() {
4239 struct stat statbuf;
4240 char buf[MAXPATHLEN];
4241 char libmawtpath[MAXPATHLEN];
4242 const char *xawtstr = "/xawt/libmawt.so";
4243 const char *new_xawtstr = "/libawt_xawt.so";
4244
4245 char *p;
4246
4247 // Get path to libjvm.so
4248 os::jvm_path(buf, sizeof(buf));
4249
4250 // Get rid of libjvm.so
4251 p = strrchr(buf, '/');
4252 if (p == NULL) return false;
4253 else *p = '\0';
4254
4255 // Get rid of client or server
4256 p = strrchr(buf, '/');
4257 if (p == NULL) return false;
4258 else *p = '\0';
4259
4260 // check xawt/libmawt.so
4261 strcpy(libmawtpath, buf);
4262 strcat(libmawtpath, xawtstr);
4263 if (::stat(libmawtpath, &statbuf) == 0) return false;
4264
4265 // check libawt_xawt.so
4266 strcpy(libmawtpath, buf);
4267 strcat(libmawtpath, new_xawtstr);
4268 if (::stat(libmawtpath, &statbuf) == 0) return false;
4269
4270 return true;
4271 }
4272
4273 // Get the default path to the core file
4274 // Returns the length of the string
4275 int os::get_core_path(char* buffer, size_t bufferSize) {
4276 const char* p = get_current_directory(buffer, bufferSize);
4277
4278 if (p == NULL) {
4279 assert(p != NULL, "failed to get current directory");
4280 return 0;
4281 }
4282
4283 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4284 p, current_process_id());
4285
4286 return strlen(buffer);
4287 }
4288
4289 #ifndef PRODUCT
4290 void TestReserveMemorySpecial_test() {
4291 // No tests available for this platform
4292 }
4293 #endif
4294
4295 bool os::start_debugging(char *buf, int buflen) {
4296 int len = (int)strlen(buf);
4297 char *p = &buf[len];
4298
4299 jio_snprintf(p, buflen -len,
4300 "\n\n"
4301 "Do you want to debug the problem?\n\n"
4302 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4303 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4304 "Otherwise, press RETURN to abort...",
4305 os::current_process_id(),
4306 os::current_thread_id(), thread_self());
4307
4308 bool yes = os::message_box("Unexpected Error", buf);
4309
4310 if (yes) {
4311 // yes, user asked VM to launch debugger
4312 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4313
4314 os::fork_and_exec(buf);
4315 yes = false;
4316 }
4317 return yes;
4318 }
4319
4320 static inline time_t get_mtime(const char* filename) {
4321 struct stat st;
4322 int ret = os::stat(filename, &st);
4323 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4324 return st.st_mtime;
4325 }
4326
4327 int os::compare_file_modified_times(const char* file1, const char* file2) {
4328 time_t t1 = get_mtime(file1);
4329 time_t t2 = get_mtime(file2);
4330 return t1 - t2;
4331 }