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 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
774 os::current_thread_id(), (uintx) kernel_thread_id);
775
776 // Normally, pthread stacks on AIX live in the data segment (are allocated with malloc()
777 // by the pthread library). In rare cases, this may not be the case, e.g. when third-party
778 // tools hook pthread_create(). In this case, we may run into problems establishing
779 // guard pages on those stacks, because the stacks may reside in memory which is not
780 // protectable (shmated).
781 if (thread->stack_base() > ::sbrk(0)) {
782 log_warning(os, thread)("Thread stack not in data segment.");
783 }
784
785 // Try to randomize the cache line index of hot stack frames.
786 // This helps when threads of the same stack traces evict each other's
787 // cache lines. The threads can be either from the same JVM instance, or
788 // from different JVM instances. The benefit is especially true for
789 // processors with hyperthreading technology.
790
791 static int counter = 0;
792 int pid = os::current_process_id();
793 alloca(((pid ^ counter++) & 7) * 128);
794
795 thread->initialize_thread_current();
796
797 OSThread* osthread = thread->osthread();
798
799 // Thread_id is pthread id.
800 osthread->set_thread_id(pthread_id);
801
802 // .. but keep kernel thread id too for diagnostics
803 osthread->set_kernel_thread_id(kernel_thread_id);
804
805 // Initialize signal mask for this thread.
806 os::Aix::hotspot_sigmask(thread);
807
808 // Initialize floating point control register.
809 os::Aix::init_thread_fpu_state();
810
811 assert(osthread->get_state() == RUNNABLE, "invalid os thread state");
812
813 // Call one more level start routine.
814 thread->run();
815
816 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
817 os::current_thread_id(), (uintx) kernel_thread_id);
818
819 // If a thread has not deleted itself ("delete this") as part of its
820 // termination sequence, we have to ensure thread-local-storage is
821 // cleared before we actually terminate. No threads should ever be
822 // deleted asynchronously with respect to their termination.
823 if (Thread::current_or_null_safe() != NULL) {
824 assert(Thread::current_or_null_safe() == thread, "current thread is wrong");
825 thread->clear_thread_current();
826 }
827
828 return 0;
829 }
830
831 bool os::create_thread(Thread* thread, ThreadType thr_type,
832 size_t req_stack_size) {
833
834 assert(thread->osthread() == NULL, "caller responsible");
835
836 // Allocate the OSThread object.
837 OSThread* osthread = new OSThread(NULL, NULL);
838 if (osthread == NULL) {
839 return false;
840 }
841
842 // Set the correct thread state.
843 osthread->set_thread_type(thr_type);
844
845 // Initial state is ALLOCATED but not INITIALIZED
846 osthread->set_state(ALLOCATED);
847
848 thread->set_osthread(osthread);
849
850 // Init thread attributes.
851 pthread_attr_t attr;
852 pthread_attr_init(&attr);
853 guarantee(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0, "???");
854
855 // Make sure we run in 1:1 kernel-user-thread mode.
856 if (os::Aix::on_aix()) {
857 guarantee(pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0, "???");
858 guarantee(pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0, "???");
859 }
860
861 // Start in suspended state, and in os::thread_start, wake the thread up.
862 guarantee(pthread_attr_setsuspendstate_np(&attr, PTHREAD_CREATE_SUSPENDED_NP) == 0, "???");
863
864 // Calculate stack size if it's not specified by caller.
865 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size);
866 int status = pthread_attr_setstacksize(&attr, stack_size);
867 assert_status(status == 0, status, "pthread_attr_setstacksize");
868
869 // Configure libc guard page.
870 pthread_attr_setguardsize(&attr, os::Aix::default_guard_size(thr_type));
871
872 pthread_t tid;
873 int ret = pthread_create(&tid, &attr, (void* (*)(void*)) thread_native_entry, thread);
874
875 char buf[64];
876 if (ret == 0) {
877 log_info(os, thread)("Thread started (pthread id: " UINTX_FORMAT ", attributes: %s). ",
878 (uintx) tid, os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
879 } else {
880 log_warning(os, thread)("Failed to start thread - pthread_create failed (%d=%s) for attributes: %s.",
881 ret, os::errno_name(ret), os::Posix::describe_pthread_attr(buf, sizeof(buf), &attr));
882 }
883
884 pthread_attr_destroy(&attr);
885
886 if (ret != 0) {
887 // Need to clean up stuff we've allocated so far.
888 thread->set_osthread(NULL);
889 delete osthread;
890 return false;
891 }
892
893 // OSThread::thread_id is the pthread id.
894 osthread->set_thread_id(tid);
895
896 return true;
897 }
898
899 /////////////////////////////////////////////////////////////////////////////
900 // attach existing thread
901
902 // bootstrap the main thread
903 bool os::create_main_thread(JavaThread* thread) {
904 assert(os::Aix::_main_thread == pthread_self(), "should be called inside main thread");
905 return create_attached_thread(thread);
906 }
907
908 bool os::create_attached_thread(JavaThread* thread) {
909 #ifdef ASSERT
910 thread->verify_not_published();
911 #endif
912
913 // Allocate the OSThread object
914 OSThread* osthread = new OSThread(NULL, NULL);
915
916 if (osthread == NULL) {
917 return false;
918 }
919
920 const pthread_t pthread_id = ::pthread_self();
921 const tid_t kernel_thread_id = ::thread_self();
922
923 // OSThread::thread_id is the pthread id.
924 osthread->set_thread_id(pthread_id);
925
926 // .. but keep kernel thread id too for diagnostics
927 osthread->set_kernel_thread_id(kernel_thread_id);
928
929 // initialize floating point control register
930 os::Aix::init_thread_fpu_state();
931
932 // Initial thread state is RUNNABLE
933 osthread->set_state(RUNNABLE);
934
935 thread->set_osthread(osthread);
936
937 if (UseNUMA) {
938 int lgrp_id = os::numa_get_group_id();
939 if (lgrp_id != -1) {
940 thread->set_lgrp_id(lgrp_id);
941 }
942 }
943
944 // initialize signal mask for this thread
945 // and save the caller's signal mask
946 os::Aix::hotspot_sigmask(thread);
947
948 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ", kernel thread id: " UINTX_FORMAT ").",
949 os::current_thread_id(), (uintx) kernel_thread_id);
950
951 return true;
952 }
953
954 void os::pd_start_thread(Thread* thread) {
955 int status = pthread_continue_np(thread->osthread()->pthread_id());
956 assert(status == 0, "thr_continue failed");
957 }
958
959 // Free OS resources related to the OSThread
960 void os::free_thread(OSThread* osthread) {
961 assert(osthread != NULL, "osthread not set");
962
963 // We are told to free resources of the argument thread,
964 // but we can only really operate on the current thread.
965 assert(Thread::current()->osthread() == osthread,
966 "os::free_thread but not current thread");
967
968 // Restore caller's signal mask
969 sigset_t sigmask = osthread->caller_sigmask();
970 pthread_sigmask(SIG_SETMASK, &sigmask, NULL);
971
972 delete osthread;
973 }
974
975 ////////////////////////////////////////////////////////////////////////////////
976 // time support
977
978 // Time since start-up in seconds to a fine granularity.
979 // Used by VMSelfDestructTimer and the MemProfiler.
980 double os::elapsedTime() {
981 return (double)(os::elapsed_counter()) * 0.000001;
982 }
983
984 jlong os::elapsed_counter() {
985 timeval time;
986 int status = gettimeofday(&time, NULL);
987 return jlong(time.tv_sec) * 1000 * 1000 + jlong(time.tv_usec) - initial_time_count;
988 }
989
990 jlong os::elapsed_frequency() {
991 return (1000 * 1000);
992 }
993
994 bool os::supports_vtime() { return true; }
995 bool os::enable_vtime() { return false; }
996 bool os::vtime_enabled() { return false; }
997
998 double os::elapsedVTime() {
999 struct rusage usage;
1000 int retval = getrusage(RUSAGE_THREAD, &usage);
1001 if (retval == 0) {
1002 return usage.ru_utime.tv_sec + usage.ru_stime.tv_sec + (usage.ru_utime.tv_usec + usage.ru_stime.tv_usec) / (1000.0 * 1000);
1003 } else {
1004 // better than nothing, but not much
1005 return elapsedTime();
1006 }
1007 }
1008
1009 jlong os::javaTimeMillis() {
1010 timeval time;
1011 int status = gettimeofday(&time, NULL);
1012 assert(status != -1, "aix error at gettimeofday()");
1013 return jlong(time.tv_sec) * 1000 + jlong(time.tv_usec / 1000);
1014 }
1015
1016 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) {
1017 timeval time;
1018 int status = gettimeofday(&time, NULL);
1019 assert(status != -1, "aix error at gettimeofday()");
1020 seconds = jlong(time.tv_sec);
1021 nanos = jlong(time.tv_usec) * 1000;
1022 }
1023
1024 jlong os::javaTimeNanos() {
1025 if (os::Aix::on_pase()) {
1026
1027 timeval time;
1028 int status = gettimeofday(&time, NULL);
1029 assert(status != -1, "PASE error at gettimeofday()");
1030 jlong usecs = jlong((unsigned long long) time.tv_sec * (1000 * 1000) + time.tv_usec);
1031 return 1000 * usecs;
1032
1033 } else {
1034 // On AIX use the precision of processors real time clock
1035 // or time base registers.
1036 timebasestruct_t time;
1037 int rc;
1038
1039 // If the CPU has a time register, it will be used and
1040 // we have to convert to real time first. After convertion we have following data:
1041 // time.tb_high [seconds since 00:00:00 UTC on 1.1.1970]
1042 // time.tb_low [nanoseconds after the last full second above]
1043 // We better use mread_real_time here instead of read_real_time
1044 // to ensure that we will get a monotonic increasing time.
1045 if (mread_real_time(&time, TIMEBASE_SZ) != RTC_POWER) {
1046 rc = time_base_to_time(&time, TIMEBASE_SZ);
1047 assert(rc != -1, "aix error at time_base_to_time()");
1048 }
1049 return jlong(time.tb_high) * (1000 * 1000 * 1000) + jlong(time.tb_low);
1050 }
1051 }
1052
1053 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
1054 info_ptr->max_value = ALL_64_BITS;
1055 // mread_real_time() is monotonic (see 'os::javaTimeNanos()')
1056 info_ptr->may_skip_backward = false;
1057 info_ptr->may_skip_forward = false;
1058 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time
1059 }
1060
1061 // Return the real, user, and system times in seconds from an
1062 // arbitrary fixed point in the past.
1063 bool os::getTimesSecs(double* process_real_time,
1064 double* process_user_time,
1065 double* process_system_time) {
1066 struct tms ticks;
1067 clock_t real_ticks = times(&ticks);
1068
1069 if (real_ticks == (clock_t) (-1)) {
1070 return false;
1071 } else {
1072 double ticks_per_second = (double) clock_tics_per_sec;
1073 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second;
1074 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second;
1075 *process_real_time = ((double) real_ticks) / ticks_per_second;
1076
1077 return true;
1078 }
1079 }
1080
1081 char * os::local_time_string(char *buf, size_t buflen) {
1082 struct tm t;
1083 time_t long_time;
1084 time(&long_time);
1085 localtime_r(&long_time, &t);
1086 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d",
1087 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday,
1088 t.tm_hour, t.tm_min, t.tm_sec);
1089 return buf;
1090 }
1091
1092 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) {
1093 return localtime_r(clock, res);
1094 }
1095
1096 ////////////////////////////////////////////////////////////////////////////////
1097 // runtime exit support
1098
1099 // Note: os::shutdown() might be called very early during initialization, or
1100 // called from signal handler. Before adding something to os::shutdown(), make
1101 // sure it is async-safe and can handle partially initialized VM.
1102 void os::shutdown() {
1103
1104 // allow PerfMemory to attempt cleanup of any persistent resources
1105 perfMemory_exit();
1106
1107 // needs to remove object in file system
1108 AttachListener::abort();
1109
1110 // flush buffered output, finish log files
1111 ostream_abort();
1112
1113 // Check for abort hook
1114 abort_hook_t abort_hook = Arguments::abort_hook();
1115 if (abort_hook != NULL) {
1116 abort_hook();
1117 }
1118 }
1119
1120 // Note: os::abort() might be called very early during initialization, or
1121 // called from signal handler. Before adding something to os::abort(), make
1122 // sure it is async-safe and can handle partially initialized VM.
1123 void os::abort(bool dump_core, void* siginfo, const void* context) {
1124 os::shutdown();
1125 if (dump_core) {
1126 #ifndef PRODUCT
1127 fdStream out(defaultStream::output_fd());
1128 out.print_raw("Current thread is ");
1129 char buf[16];
1130 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id());
1131 out.print_raw_cr(buf);
1132 out.print_raw_cr("Dumping core ...");
1133 #endif
1134 ::abort(); // dump core
1135 }
1136
1137 ::exit(1);
1138 }
1139
1140 // Die immediately, no exit hook, no abort hook, no cleanup.
1141 void os::die() {
1142 ::abort();
1143 }
1144
1145 // This method is a copy of JDK's sysGetLastErrorString
1146 // from src/solaris/hpi/src/system_md.c
1147
1148 size_t os::lasterror(char *buf, size_t len) {
1149 if (errno == 0) return 0;
1150
1151 const char *s = os::strerror(errno);
1152 size_t n = ::strlen(s);
1153 if (n >= len) {
1154 n = len - 1;
1155 }
1156 ::strncpy(buf, s, n);
1157 buf[n] = '\0';
1158 return n;
1159 }
1160
1161 intx os::current_thread_id() {
1162 return (intx)pthread_self();
1163 }
1164
1165 int os::current_process_id() {
1166 return getpid();
1167 }
1168
1169 // DLL functions
1170
1171 const char* os::dll_file_extension() { return ".so"; }
1172
1173 // This must be hard coded because it's the system's temporary
1174 // directory not the java application's temp directory, ala java.io.tmpdir.
1175 const char* os::get_temp_directory() { return "/tmp"; }
1176
1177 static bool file_exists(const char* filename) {
1178 struct stat statbuf;
1179 if (filename == NULL || strlen(filename) == 0) {
1180 return false;
1181 }
1182 return os::stat(filename, &statbuf) == 0;
1183 }
1184
1185 bool os::dll_build_name(char* buffer, size_t buflen,
1186 const char* pname, const char* fname) {
1187 bool retval = false;
1188 // Copied from libhpi
1189 const size_t pnamelen = pname ? strlen(pname) : 0;
1190
1191 // Return error on buffer overflow.
1192 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) {
1193 *buffer = '\0';
1194 return retval;
1195 }
1196
1197 if (pnamelen == 0) {
1198 snprintf(buffer, buflen, "lib%s.so", fname);
1199 retval = true;
1200 } else if (strchr(pname, *os::path_separator()) != NULL) {
1201 int n;
1202 char** pelements = split_path(pname, &n);
1203 if (pelements == NULL) {
1204 return false;
1205 }
1206 for (int i = 0; i < n; i++) {
1207 // Really shouldn't be NULL, but check can't hurt
1208 if (pelements[i] == NULL || strlen(pelements[i]) == 0) {
1209 continue; // skip the empty path values
1210 }
1211 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname);
1212 if (file_exists(buffer)) {
1213 retval = true;
1214 break;
1215 }
1216 }
1217 // release the storage
1218 for (int i = 0; i < n; i++) {
1219 if (pelements[i] != NULL) {
1220 FREE_C_HEAP_ARRAY(char, pelements[i]);
1221 }
1222 }
1223 if (pelements != NULL) {
1224 FREE_C_HEAP_ARRAY(char*, pelements);
1225 }
1226 } else {
1227 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname);
1228 retval = true;
1229 }
1230 return retval;
1231 }
1232
1233 // Check if addr is inside libjvm.so.
1234 bool os::address_is_in_vm(address addr) {
1235
1236 // Input could be a real pc or a function pointer literal. The latter
1237 // would be a function descriptor residing in the data segment of a module.
1238 loaded_module_t lm;
1239 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL) {
1240 return lm.is_in_vm;
1241 } else if (LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
1242 return lm.is_in_vm;
1243 } else {
1244 return false;
1245 }
1246
1247 }
1248
1249 // Resolve an AIX function descriptor literal to a code pointer.
1250 // If the input is a valid code pointer to a text segment of a loaded module,
1251 // it is returned unchanged.
1252 // If the input is a valid AIX function descriptor, it is resolved to the
1253 // code entry point.
1254 // If the input is neither a valid function descriptor nor a valid code pointer,
1255 // NULL is returned.
1256 static address resolve_function_descriptor_to_code_pointer(address p) {
1257
1258 if (LoadedLibraries::find_for_text_address(p, NULL) != NULL) {
1259 // It is a real code pointer.
1260 return p;
1261 } else if (LoadedLibraries::find_for_data_address(p, NULL) != NULL) {
1262 // Pointer to data segment, potential function descriptor.
1263 address code_entry = (address)(((FunctionDescriptor*)p)->entry());
1264 if (LoadedLibraries::find_for_text_address(code_entry, NULL) != NULL) {
1265 // It is a function descriptor.
1266 return code_entry;
1267 }
1268 }
1269
1270 return NULL;
1271 }
1272
1273 bool os::dll_address_to_function_name(address addr, char *buf,
1274 int buflen, int *offset,
1275 bool demangle) {
1276 if (offset) {
1277 *offset = -1;
1278 }
1279 // Buf is not optional, but offset is optional.
1280 assert(buf != NULL, "sanity check");
1281 buf[0] = '\0';
1282
1283 // Resolve function ptr literals first.
1284 addr = resolve_function_descriptor_to_code_pointer(addr);
1285 if (!addr) {
1286 return false;
1287 }
1288
1289 return AixSymbols::get_function_name(addr, buf, buflen, offset, NULL, demangle);
1290 }
1291
1292 bool os::dll_address_to_library_name(address addr, char* buf,
1293 int buflen, int* offset) {
1294 if (offset) {
1295 *offset = -1;
1296 }
1297 // Buf is not optional, but offset is optional.
1298 assert(buf != NULL, "sanity check");
1299 buf[0] = '\0';
1300
1301 // Resolve function ptr literals first.
1302 addr = resolve_function_descriptor_to_code_pointer(addr);
1303 if (!addr) {
1304 return false;
1305 }
1306
1307 return AixSymbols::get_module_name(addr, buf, buflen);
1308 }
1309
1310 // Loads .dll/.so and in case of error it checks if .dll/.so was built
1311 // for the same architecture as Hotspot is running on.
1312 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
1313
1314 if (ebuf && ebuflen > 0) {
1315 ebuf[0] = '\0';
1316 ebuf[ebuflen - 1] = '\0';
1317 }
1318
1319 if (!filename || strlen(filename) == 0) {
1320 ::strncpy(ebuf, "dll_load: empty filename specified", ebuflen - 1);
1321 return NULL;
1322 }
1323
1324 // RTLD_LAZY is currently not implemented. The dl is loaded immediately with all its dependants.
1325 void * result= ::dlopen(filename, RTLD_LAZY);
1326 if (result != NULL) {
1327 // Reload dll cache. Don't do this in signal handling.
1328 LoadedLibraries::reload();
1329 return result;
1330 } else {
1331 // error analysis when dlopen fails
1332 const char* const error_report = ::dlerror();
1333 if (error_report && ebuf && ebuflen > 0) {
1334 snprintf(ebuf, ebuflen - 1, "%s, LIBPATH=%s, LD_LIBRARY_PATH=%s : %s",
1335 filename, ::getenv("LIBPATH"), ::getenv("LD_LIBRARY_PATH"), error_report);
1336 }
1337 }
1338 return NULL;
1339 }
1340
1341 void* os::dll_lookup(void* handle, const char* name) {
1342 void* res = dlsym(handle, name);
1343 return res;
1344 }
1345
1346 void* os::get_default_process_handle() {
1347 return (void*)::dlopen(NULL, RTLD_LAZY);
1348 }
1349
1350 void os::print_dll_info(outputStream *st) {
1351 st->print_cr("Dynamic libraries:");
1352 LoadedLibraries::print(st);
1353 }
1354
1355 void os::get_summary_os_info(char* buf, size_t buflen) {
1356 // There might be something more readable than uname results for AIX.
1357 struct utsname name;
1358 uname(&name);
1359 snprintf(buf, buflen, "%s %s", name.release, name.version);
1360 }
1361
1362 void os::print_os_info(outputStream* st) {
1363 st->print("OS:");
1364
1365 st->print("uname:");
1366 struct utsname name;
1367 uname(&name);
1368 st->print(name.sysname); st->print(" ");
1369 st->print(name.nodename); st->print(" ");
1370 st->print(name.release); st->print(" ");
1371 st->print(name.version); st->print(" ");
1372 st->print(name.machine);
1373 st->cr();
1374
1375 uint32_t ver = os::Aix::os_version();
1376 st->print_cr("AIX kernel version %u.%u.%u.%u",
1377 (ver >> 24) & 0xFF, (ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
1378
1379 os::Posix::print_rlimit_info(st);
1380
1381 // load average
1382 st->print("load average:");
1383 double loadavg[3] = {-1.L, -1.L, -1.L};
1384 os::loadavg(loadavg, 3);
1385 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]);
1386 st->cr();
1387
1388 // print wpar info
1389 libperfstat::wparinfo_t wi;
1390 if (libperfstat::get_wparinfo(&wi)) {
1391 st->print_cr("wpar info");
1392 st->print_cr("name: %s", wi.name);
1393 st->print_cr("id: %d", wi.wpar_id);
1394 st->print_cr("type: %s", (wi.app_wpar ? "application" : "system"));
1395 }
1396
1397 // print partition info
1398 libperfstat::partitioninfo_t pi;
1399 if (libperfstat::get_partitioninfo(&pi)) {
1400 st->print_cr("partition info");
1401 st->print_cr(" name: %s", pi.name);
1402 }
1403
1404 }
1405
1406 void os::print_memory_info(outputStream* st) {
1407
1408 st->print_cr("Memory:");
1409
1410 st->print_cr(" Base page size (sysconf _SC_PAGESIZE): %s",
1411 describe_pagesize(g_multipage_support.pagesize));
1412 st->print_cr(" Data page size (C-Heap, bss, etc): %s",
1413 describe_pagesize(g_multipage_support.datapsize));
1414 st->print_cr(" Text page size: %s",
1415 describe_pagesize(g_multipage_support.textpsize));
1416 st->print_cr(" Thread stack page size (pthread): %s",
1417 describe_pagesize(g_multipage_support.pthr_stack_pagesize));
1418 st->print_cr(" Default shared memory page size: %s",
1419 describe_pagesize(g_multipage_support.shmpsize));
1420 st->print_cr(" Can use 64K pages dynamically with shared meory: %s",
1421 (g_multipage_support.can_use_64K_pages ? "yes" :"no"));
1422 st->print_cr(" Can use 16M pages dynamically with shared memory: %s",
1423 (g_multipage_support.can_use_16M_pages ? "yes" :"no"));
1424 st->print_cr(" Multipage error: %d",
1425 g_multipage_support.error);
1426 st->cr();
1427 st->print_cr(" os::vm_page_size: %s", describe_pagesize(os::vm_page_size()));
1428
1429 // print out LDR_CNTRL because it affects the default page sizes
1430 const char* const ldr_cntrl = ::getenv("LDR_CNTRL");
1431 st->print_cr(" LDR_CNTRL=%s.", ldr_cntrl ? ldr_cntrl : "<unset>");
1432
1433 // Print out EXTSHM because it is an unsupported setting.
1434 const char* const extshm = ::getenv("EXTSHM");
1435 st->print_cr(" EXTSHM=%s.", extshm ? extshm : "<unset>");
1436 if ( (strcmp(extshm, "on") == 0) || (strcmp(extshm, "ON") == 0) ) {
1437 st->print_cr(" *** Unsupported! Please remove EXTSHM from your environment! ***");
1438 }
1439
1440 // Print out AIXTHREAD_GUARDPAGES because it affects the size of pthread stacks.
1441 const char* const aixthread_guardpages = ::getenv("AIXTHREAD_GUARDPAGES");
1442 st->print_cr(" AIXTHREAD_GUARDPAGES=%s.",
1443 aixthread_guardpages ? aixthread_guardpages : "<unset>");
1444
1445 os::Aix::meminfo_t mi;
1446 if (os::Aix::get_meminfo(&mi)) {
1447 char buffer[256];
1448 if (os::Aix::on_aix()) {
1449 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1450 st->print_cr("physical free : " SIZE_FORMAT, mi.real_free);
1451 st->print_cr("swap total : " SIZE_FORMAT, mi.pgsp_total);
1452 st->print_cr("swap free : " SIZE_FORMAT, mi.pgsp_free);
1453 } else {
1454 // PASE - Numbers are result of QWCRSSTS; they mean:
1455 // real_total: Sum of all system pools
1456 // real_free: always 0
1457 // pgsp_total: we take the size of the system ASP
1458 // pgsp_free: size of system ASP times percentage of system ASP unused
1459 st->print_cr("physical total : " SIZE_FORMAT, mi.real_total);
1460 st->print_cr("system asp total : " SIZE_FORMAT, mi.pgsp_total);
1461 st->print_cr("%% system asp used : " SIZE_FORMAT,
1462 mi.pgsp_total ? (100.0f * (mi.pgsp_total - mi.pgsp_free) / mi.pgsp_total) : -1.0f);
1463 }
1464 st->print_raw(buffer);
1465 }
1466 st->cr();
1467
1468 // Print segments allocated with os::reserve_memory.
1469 st->print_cr("internal virtual memory regions used by vm:");
1470 vmembk_print_on(st);
1471 }
1472
1473 // Get a string for the cpuinfo that is a summary of the cpu type
1474 void os::get_summary_cpu_info(char* buf, size_t buflen) {
1475 // This looks good
1476 libperfstat::cpuinfo_t ci;
1477 if (libperfstat::get_cpuinfo(&ci)) {
1478 strncpy(buf, ci.version, buflen);
1479 } else {
1480 strncpy(buf, "AIX", buflen);
1481 }
1482 }
1483
1484 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) {
1485 st->print("CPU:");
1486 st->print("total %d", os::processor_count());
1487 // It's not safe to query number of active processors after crash.
1488 // st->print("(active %d)", os::active_processor_count());
1489 st->print(" %s", VM_Version::features());
1490 st->cr();
1491 }
1492
1493 static void print_signal_handler(outputStream* st, int sig,
1494 char* buf, size_t buflen);
1495
1496 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) {
1497 st->print_cr("Signal Handlers:");
1498 print_signal_handler(st, SIGSEGV, buf, buflen);
1499 print_signal_handler(st, SIGBUS , buf, buflen);
1500 print_signal_handler(st, SIGFPE , buf, buflen);
1501 print_signal_handler(st, SIGPIPE, buf, buflen);
1502 print_signal_handler(st, SIGXFSZ, buf, buflen);
1503 print_signal_handler(st, SIGILL , buf, buflen);
1504 print_signal_handler(st, SR_signum, buf, buflen);
1505 print_signal_handler(st, SHUTDOWN1_SIGNAL, buf, buflen);
1506 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen);
1507 print_signal_handler(st, SHUTDOWN3_SIGNAL , buf, buflen);
1508 print_signal_handler(st, BREAK_SIGNAL, buf, buflen);
1509 print_signal_handler(st, SIGTRAP, buf, buflen);
1510 // We also want to know if someone else adds a SIGDANGER handler because
1511 // that will interfere with OOM killling.
1512 print_signal_handler(st, SIGDANGER, buf, buflen);
1513 }
1514
1515 static char saved_jvm_path[MAXPATHLEN] = {0};
1516
1517 // Find the full path to the current module, libjvm.so.
1518 void os::jvm_path(char *buf, jint buflen) {
1519 // Error checking.
1520 if (buflen < MAXPATHLEN) {
1521 assert(false, "must use a large-enough buffer");
1522 buf[0] = '\0';
1523 return;
1524 }
1525 // Lazy resolve the path to current module.
1526 if (saved_jvm_path[0] != 0) {
1527 strcpy(buf, saved_jvm_path);
1528 return;
1529 }
1530
1531 Dl_info dlinfo;
1532 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo);
1533 assert(ret != 0, "cannot locate libjvm");
1534 char* rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1535 assert(rp != NULL, "error in realpath(): maybe the 'path' argument is too long?");
1536
1537 if (Arguments::sun_java_launcher_is_altjvm()) {
1538 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical
1539 // value for buf is "<JAVA_HOME>/jre/lib/<vmtype>/libjvm.so".
1540 // If "/jre/lib/" appears at the right place in the string, then
1541 // assume we are installed in a JDK and we're done. Otherwise, check
1542 // for a JAVA_HOME environment variable and fix up the path so it
1543 // looks like libjvm.so is installed there (append a fake suffix
1544 // hotspot/libjvm.so).
1545 const char *p = buf + strlen(buf) - 1;
1546 for (int count = 0; p > buf && count < 4; ++count) {
1547 for (--p; p > buf && *p != '/'; --p)
1548 /* empty */ ;
1549 }
1550
1551 if (strncmp(p, "/jre/lib/", 9) != 0) {
1552 // Look for JAVA_HOME in the environment.
1553 char* java_home_var = ::getenv("JAVA_HOME");
1554 if (java_home_var != NULL && java_home_var[0] != 0) {
1555 char* jrelib_p;
1556 int len;
1557
1558 // Check the current module name "libjvm.so".
1559 p = strrchr(buf, '/');
1560 if (p == NULL) {
1561 return;
1562 }
1563 assert(strstr(p, "/libjvm") == p, "invalid library name");
1564
1565 rp = os::Posix::realpath(java_home_var, buf, buflen);
1566 if (rp == NULL) {
1567 return;
1568 }
1569
1570 // determine if this is a legacy image or modules image
1571 // modules image doesn't have "jre" subdirectory
1572 len = strlen(buf);
1573 assert(len < buflen, "Ran out of buffer room");
1574 jrelib_p = buf + len;
1575 snprintf(jrelib_p, buflen-len, "/jre/lib");
1576 if (0 != access(buf, F_OK)) {
1577 snprintf(jrelib_p, buflen-len, "/lib");
1578 }
1579
1580 if (0 == access(buf, F_OK)) {
1581 // Use current module name "libjvm.so"
1582 len = strlen(buf);
1583 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so");
1584 } else {
1585 // Go back to path of .so
1586 rp = os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen);
1587 if (rp == NULL) {
1588 return;
1589 }
1590 }
1591 }
1592 }
1593 }
1594
1595 strncpy(saved_jvm_path, buf, sizeof(saved_jvm_path));
1596 saved_jvm_path[sizeof(saved_jvm_path) - 1] = '\0';
1597 }
1598
1599 void os::print_jni_name_prefix_on(outputStream* st, int args_size) {
1600 // no prefix required, not even "_"
1601 }
1602
1603 void os::print_jni_name_suffix_on(outputStream* st, int args_size) {
1604 // no suffix required
1605 }
1606
1607 ////////////////////////////////////////////////////////////////////////////////
1608 // sun.misc.Signal support
1609
1610 static volatile jint sigint_count = 0;
1611
1612 static void
1613 UserHandler(int sig, void *siginfo, void *context) {
1614 // 4511530 - sem_post is serialized and handled by the manager thread. When
1615 // the program is interrupted by Ctrl-C, SIGINT is sent to every thread. We
1616 // don't want to flood the manager thread with sem_post requests.
1617 if (sig == SIGINT && Atomic::add(1, &sigint_count) > 1)
1618 return;
1619
1620 // Ctrl-C is pressed during error reporting, likely because the error
1621 // handler fails to abort. Let VM die immediately.
1622 if (sig == SIGINT && VMError::is_error_reported()) {
1623 os::die();
1624 }
1625
1626 os::signal_notify(sig);
1627 }
1628
1629 void* os::user_handler() {
1630 return CAST_FROM_FN_PTR(void*, UserHandler);
1631 }
1632
1633 extern "C" {
1634 typedef void (*sa_handler_t)(int);
1635 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
1636 }
1637
1638 void* os::signal(int signal_number, void* handler) {
1639 struct sigaction sigAct, oldSigAct;
1640
1641 sigfillset(&(sigAct.sa_mask));
1642
1643 // Do not block out synchronous signals in the signal handler.
1644 // Blocking synchronous signals only makes sense if you can really
1645 // be sure that those signals won't happen during signal handling,
1646 // when the blocking applies. Normal signal handlers are lean and
1647 // do not cause signals. But our signal handlers tend to be "risky"
1648 // - secondary SIGSEGV, SIGILL, SIGBUS' may and do happen.
1649 // On AIX, PASE there was a case where a SIGSEGV happened, followed
1650 // by a SIGILL, which was blocked due to the signal mask. The process
1651 // just hung forever. Better to crash from a secondary signal than to hang.
1652 sigdelset(&(sigAct.sa_mask), SIGSEGV);
1653 sigdelset(&(sigAct.sa_mask), SIGBUS);
1654 sigdelset(&(sigAct.sa_mask), SIGILL);
1655 sigdelset(&(sigAct.sa_mask), SIGFPE);
1656 sigdelset(&(sigAct.sa_mask), SIGTRAP);
1657
1658 sigAct.sa_flags = SA_RESTART|SA_SIGINFO;
1659
1660 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler);
1661
1662 if (sigaction(signal_number, &sigAct, &oldSigAct)) {
1663 // -1 means registration failed
1664 return (void *)-1;
1665 }
1666
1667 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler);
1668 }
1669
1670 void os::signal_raise(int signal_number) {
1671 ::raise(signal_number);
1672 }
1673
1674 //
1675 // The following code is moved from os.cpp for making this
1676 // code platform specific, which it is by its very nature.
1677 //
1678
1679 // Will be modified when max signal is changed to be dynamic
1680 int os::sigexitnum_pd() {
1681 return NSIG;
1682 }
1683
1684 // a counter for each possible signal value
1685 static volatile jint pending_signals[NSIG+1] = { 0 };
1686
1687 // Wrapper functions for: sem_init(), sem_post(), sem_wait()
1688 // On AIX, we use sem_init(), sem_post(), sem_wait()
1689 // On Pase, we need to use msem_lock() and msem_unlock(), because Posix Semaphores
1690 // do not seem to work at all on PASE (unimplemented, will cause SIGILL).
1691 // Note that just using msem_.. APIs for both PASE and AIX is not an option either, as
1692 // on AIX, msem_..() calls are suspected of causing problems.
1693 static sem_t sig_sem;
1694 static msemaphore* p_sig_msem = 0;
1695
1696 static void local_sem_init() {
1697 if (os::Aix::on_aix()) {
1698 int rc = ::sem_init(&sig_sem, 0, 0);
1699 guarantee(rc != -1, "sem_init failed");
1700 } else {
1701 // Memory semaphores must live in shared mem.
1702 guarantee0(p_sig_msem == NULL);
1703 p_sig_msem = (msemaphore*)os::reserve_memory(sizeof(msemaphore), NULL);
1704 guarantee(p_sig_msem, "Cannot allocate memory for memory semaphore");
1705 guarantee(::msem_init(p_sig_msem, 0) == p_sig_msem, "msem_init failed");
1706 }
1707 }
1708
1709 static void local_sem_post() {
1710 static bool warn_only_once = false;
1711 if (os::Aix::on_aix()) {
1712 int rc = ::sem_post(&sig_sem);
1713 if (rc == -1 && !warn_only_once) {
1714 trcVerbose("sem_post failed (errno = %d, %s)", errno, os::errno_name(errno));
1715 warn_only_once = true;
1716 }
1717 } else {
1718 guarantee0(p_sig_msem != NULL);
1719 int rc = ::msem_unlock(p_sig_msem, 0);
1720 if (rc == -1 && !warn_only_once) {
1721 trcVerbose("msem_unlock failed (errno = %d, %s)", errno, os::errno_name(errno));
1722 warn_only_once = true;
1723 }
1724 }
1725 }
1726
1727 static void local_sem_wait() {
1728 static bool warn_only_once = false;
1729 if (os::Aix::on_aix()) {
1730 int rc = ::sem_wait(&sig_sem);
1731 if (rc == -1 && !warn_only_once) {
1732 trcVerbose("sem_wait failed (errno = %d, %s)", errno, os::errno_name(errno));
1733 warn_only_once = true;
1734 }
1735 } else {
1736 guarantee0(p_sig_msem != NULL); // must init before use
1737 int rc = ::msem_lock(p_sig_msem, 0);
1738 if (rc == -1 && !warn_only_once) {
1739 trcVerbose("msem_lock failed (errno = %d, %s)", errno, os::errno_name(errno));
1740 warn_only_once = true;
1741 }
1742 }
1743 }
1744
1745 void os::signal_init_pd() {
1746 // Initialize signal structures
1747 ::memset((void*)pending_signals, 0, sizeof(pending_signals));
1748
1749 // Initialize signal semaphore
1750 local_sem_init();
1751 }
1752
1753 void os::signal_notify(int sig) {
1754 Atomic::inc(&pending_signals[sig]);
1755 local_sem_post();
1756 }
1757
1758 static int check_pending_signals(bool wait) {
1759 Atomic::store(0, &sigint_count);
1760 for (;;) {
1761 for (int i = 0; i < NSIG + 1; i++) {
1762 jint n = pending_signals[i];
1763 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) {
1764 return i;
1765 }
1766 }
1767 if (!wait) {
1768 return -1;
1769 }
1770 JavaThread *thread = JavaThread::current();
1771 ThreadBlockInVM tbivm(thread);
1772
1773 bool threadIsSuspended;
1774 do {
1775 thread->set_suspend_equivalent();
1776 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self()
1777
1778 local_sem_wait();
1779
1780 // were we externally suspended while we were waiting?
1781 threadIsSuspended = thread->handle_special_suspend_equivalent_condition();
1782 if (threadIsSuspended) {
1783 //
1784 // The semaphore has been incremented, but while we were waiting
1785 // another thread suspended us. We don't want to continue running
1786 // while suspended because that would surprise the thread that
1787 // suspended us.
1788 //
1789
1790 local_sem_post();
1791
1792 thread->java_suspend_self();
1793 }
1794 } while (threadIsSuspended);
1795 }
1796 }
1797
1798 int os::signal_lookup() {
1799 return check_pending_signals(false);
1800 }
1801
1802 int os::signal_wait() {
1803 return check_pending_signals(true);
1804 }
1805
1806 ////////////////////////////////////////////////////////////////////////////////
1807 // Virtual Memory
1808
1809 // We need to keep small simple bookkeeping for os::reserve_memory and friends.
1810
1811 #define VMEM_MAPPED 1
1812 #define VMEM_SHMATED 2
1813
1814 struct vmembk_t {
1815 int type; // 1 - mmap, 2 - shmat
1816 char* addr;
1817 size_t size; // Real size, may be larger than usersize.
1818 size_t pagesize; // page size of area
1819 vmembk_t* next;
1820
1821 bool contains_addr(char* p) const {
1822 return p >= addr && p < (addr + size);
1823 }
1824
1825 bool contains_range(char* p, size_t s) const {
1826 return contains_addr(p) && contains_addr(p + s - 1);
1827 }
1828
1829 void print_on(outputStream* os) const {
1830 os->print("[" PTR_FORMAT " - " PTR_FORMAT "] (" UINTX_FORMAT
1831 " bytes, %d %s pages), %s",
1832 addr, addr + size - 1, size, size / pagesize, describe_pagesize(pagesize),
1833 (type == VMEM_SHMATED ? "shmat" : "mmap")
1834 );
1835 }
1836
1837 // Check that range is a sub range of memory block (or equal to memory block);
1838 // also check that range is fully page aligned to the page size if the block.
1839 void assert_is_valid_subrange(char* p, size_t s) const {
1840 if (!contains_range(p, s)) {
1841 trcVerbose("[" PTR_FORMAT " - " PTR_FORMAT "] is not a sub "
1842 "range of [" PTR_FORMAT " - " PTR_FORMAT "].",
1843 p, p + s, addr, addr + size);
1844 guarantee0(false);
1845 }
1846 if (!is_aligned_to(p, pagesize) || !is_aligned_to(p + s, pagesize)) {
1847 trcVerbose("range [" PTR_FORMAT " - " PTR_FORMAT "] is not"
1848 " aligned to pagesize (%lu)", p, p + s, (unsigned long) pagesize);
1849 guarantee0(false);
1850 }
1851 }
1852 };
1853
1854 static struct {
1855 vmembk_t* first;
1856 MiscUtils::CritSect cs;
1857 } vmem;
1858
1859 static void vmembk_add(char* addr, size_t size, size_t pagesize, int type) {
1860 vmembk_t* p = (vmembk_t*) ::malloc(sizeof(vmembk_t));
1861 assert0(p);
1862 if (p) {
1863 MiscUtils::AutoCritSect lck(&vmem.cs);
1864 p->addr = addr; p->size = size;
1865 p->pagesize = pagesize;
1866 p->type = type;
1867 p->next = vmem.first;
1868 vmem.first = p;
1869 }
1870 }
1871
1872 static vmembk_t* vmembk_find(char* addr) {
1873 MiscUtils::AutoCritSect lck(&vmem.cs);
1874 for (vmembk_t* p = vmem.first; p; p = p->next) {
1875 if (p->addr <= addr && (p->addr + p->size) > addr) {
1876 return p;
1877 }
1878 }
1879 return NULL;
1880 }
1881
1882 static void vmembk_remove(vmembk_t* p0) {
1883 MiscUtils::AutoCritSect lck(&vmem.cs);
1884 assert0(p0);
1885 assert0(vmem.first); // List should not be empty.
1886 for (vmembk_t** pp = &(vmem.first); *pp; pp = &((*pp)->next)) {
1887 if (*pp == p0) {
1888 *pp = p0->next;
1889 ::free(p0);
1890 return;
1891 }
1892 }
1893 assert0(false); // Not found?
1894 }
1895
1896 static void vmembk_print_on(outputStream* os) {
1897 MiscUtils::AutoCritSect lck(&vmem.cs);
1898 for (vmembk_t* vmi = vmem.first; vmi; vmi = vmi->next) {
1899 vmi->print_on(os);
1900 os->cr();
1901 }
1902 }
1903
1904 // Reserve and attach a section of System V memory.
1905 // If <requested_addr> is not NULL, function will attempt to attach the memory at the given
1906 // address. Failing that, it will attach the memory anywhere.
1907 // If <requested_addr> is NULL, function will attach the memory anywhere.
1908 //
1909 // <alignment_hint> is being ignored by this function. It is very probable however that the
1910 // alignment requirements are met anyway, because shmat() attaches at 256M boundaries.
1911 // Should this be not enogh, we can put more work into it.
1912 static char* reserve_shmated_memory (
1913 size_t bytes,
1914 char* requested_addr,
1915 size_t alignment_hint) {
1916
1917 trcVerbose("reserve_shmated_memory " UINTX_FORMAT " bytes, wishaddress "
1918 PTR_FORMAT ", alignment_hint " UINTX_FORMAT "...",
1919 bytes, requested_addr, alignment_hint);
1920
1921 // Either give me wish address or wish alignment but not both.
1922 assert0(!(requested_addr != NULL && alignment_hint != 0));
1923
1924 // We must prevent anyone from attaching too close to the
1925 // BRK because that may cause malloc OOM.
1926 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
1927 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
1928 "Will attach anywhere.", requested_addr);
1929 // Act like the OS refused to attach there.
1930 requested_addr = NULL;
1931 }
1932
1933 // For old AS/400's (V5R4 and older) we should not even be here - System V shared memory is not
1934 // really supported (max size 4GB), so reserve_mmapped_memory should have been used instead.
1935 if (os::Aix::on_pase_V5R4_or_older()) {
1936 ShouldNotReachHere();
1937 }
1938
1939 // Align size of shm up to 64K to avoid errors if we later try to change the page size.
1940 const size_t size = align_up(bytes, 64*K);
1941
1942 // Reserve the shared segment.
1943 int shmid = shmget(IPC_PRIVATE, size, IPC_CREAT | S_IRUSR | S_IWUSR);
1944 if (shmid == -1) {
1945 trcVerbose("shmget(.., " UINTX_FORMAT ", ..) failed (errno: %d).", size, errno);
1946 return NULL;
1947 }
1948
1949 // Important note:
1950 // It is very important that we, upon leaving this function, do not leave a shm segment alive.
1951 // We must right after attaching it remove it from the system. System V shm segments are global and
1952 // survive the process.
1953 // So, from here on: Do not assert, do not return, until we have called shmctl(IPC_RMID) (A).
1954
1955 struct shmid_ds shmbuf;
1956 memset(&shmbuf, 0, sizeof(shmbuf));
1957 shmbuf.shm_pagesize = 64*K;
1958 if (shmctl(shmid, SHM_PAGESIZE, &shmbuf) != 0) {
1959 trcVerbose("Failed to set page size (need " UINTX_FORMAT " 64K pages) - shmctl failed with %d.",
1960 size / (64*K), errno);
1961 // I want to know if this ever happens.
1962 assert(false, "failed to set page size for shmat");
1963 }
1964
1965 // Now attach the shared segment.
1966 // Note that I attach with SHM_RND - which means that the requested address is rounded down, if
1967 // needed, to the next lowest segment boundary. Otherwise the attach would fail if the address
1968 // were not a segment boundary.
1969 char* const addr = (char*) shmat(shmid, requested_addr, SHM_RND);
1970 const int errno_shmat = errno;
1971
1972 // (A) Right after shmat and before handing shmat errors delete the shm segment.
1973 if (::shmctl(shmid, IPC_RMID, NULL) == -1) {
1974 trcVerbose("shmctl(%u, IPC_RMID) failed (%d)\n", shmid, errno);
1975 assert(false, "failed to remove shared memory segment!");
1976 }
1977
1978 // Handle shmat error. If we failed to attach, just return.
1979 if (addr == (char*)-1) {
1980 trcVerbose("Failed to attach segment at " PTR_FORMAT " (%d).", requested_addr, errno_shmat);
1981 return NULL;
1982 }
1983
1984 // Just for info: query the real page size. In case setting the page size did not
1985 // work (see above), the system may have given us something other then 4K (LDR_CNTRL).
1986 const size_t real_pagesize = os::Aix::query_pagesize(addr);
1987 if (real_pagesize != shmbuf.shm_pagesize) {
1988 trcVerbose("pagesize is, surprisingly, %h.", real_pagesize);
1989 }
1990
1991 if (addr) {
1992 trcVerbose("shm-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes, " UINTX_FORMAT " %s pages)",
1993 addr, addr + size - 1, size, size/real_pagesize, describe_pagesize(real_pagesize));
1994 } else {
1995 if (requested_addr != NULL) {
1996 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at with address " PTR_FORMAT ".", size, requested_addr);
1997 } else {
1998 trcVerbose("failed to shm-allocate " UINTX_FORMAT " bytes at any address.", size);
1999 }
2000 }
2001
2002 // book-keeping
2003 vmembk_add(addr, size, real_pagesize, VMEM_SHMATED);
2004 assert0(is_aligned_to(addr, os::vm_page_size()));
2005
2006 return addr;
2007 }
2008
2009 static bool release_shmated_memory(char* addr, size_t size) {
2010
2011 trcVerbose("release_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2012 addr, addr + size - 1);
2013
2014 bool rc = false;
2015
2016 // TODO: is there a way to verify shm size without doing bookkeeping?
2017 if (::shmdt(addr) != 0) {
2018 trcVerbose("error (%d).", errno);
2019 } else {
2020 trcVerbose("ok.");
2021 rc = true;
2022 }
2023 return rc;
2024 }
2025
2026 static bool uncommit_shmated_memory(char* addr, size_t size) {
2027 trcVerbose("uncommit_shmated_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2028 addr, addr + size - 1);
2029
2030 const bool rc = my_disclaim64(addr, size);
2031
2032 if (!rc) {
2033 trcVerbose("my_disclaim64(" PTR_FORMAT ", " UINTX_FORMAT ") failed.\n", addr, size);
2034 return false;
2035 }
2036 return true;
2037 }
2038
2039 //////////////////////////////// mmap-based routines /////////////////////////////////
2040
2041 // Reserve memory via mmap.
2042 // If <requested_addr> is given, an attempt is made to attach at the given address.
2043 // Failing that, memory is allocated at any address.
2044 // If <alignment_hint> is given and <requested_addr> is NULL, an attempt is made to
2045 // allocate at an address aligned with the given alignment. Failing that, memory
2046 // is aligned anywhere.
2047 static char* reserve_mmaped_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2048 trcVerbose("reserve_mmaped_memory " UINTX_FORMAT " bytes, wishaddress " PTR_FORMAT ", "
2049 "alignment_hint " UINTX_FORMAT "...",
2050 bytes, requested_addr, alignment_hint);
2051
2052 // If a wish address is given, but not aligned to 4K page boundary, mmap will fail.
2053 if (requested_addr && !is_aligned_to(requested_addr, os::vm_page_size()) != 0) {
2054 trcVerbose("Wish address " PTR_FORMAT " not aligned to page boundary.", requested_addr);
2055 return NULL;
2056 }
2057
2058 // We must prevent anyone from attaching too close to the
2059 // BRK because that may cause malloc OOM.
2060 if (requested_addr != NULL && is_close_to_brk((address)requested_addr)) {
2061 trcVerbose("Wish address " PTR_FORMAT " is too close to the BRK segment. "
2062 "Will attach anywhere.", requested_addr);
2063 // Act like the OS refused to attach there.
2064 requested_addr = NULL;
2065 }
2066
2067 // Specify one or the other but not both.
2068 assert0(!(requested_addr != NULL && alignment_hint > 0));
2069
2070 // In 64K mode, we claim the global page size (os::vm_page_size())
2071 // is 64K. This is one of the few points where that illusion may
2072 // break, because mmap() will always return memory aligned to 4K. So
2073 // we must ensure we only ever return memory aligned to 64k.
2074 if (alignment_hint) {
2075 alignment_hint = lcm(alignment_hint, os::vm_page_size());
2076 } else {
2077 alignment_hint = os::vm_page_size();
2078 }
2079
2080 // Size shall always be a multiple of os::vm_page_size (esp. in 64K mode).
2081 const size_t size = align_up(bytes, os::vm_page_size());
2082
2083 // alignment: Allocate memory large enough to include an aligned range of the right size and
2084 // cut off the leading and trailing waste pages.
2085 assert0(alignment_hint != 0 && is_aligned_to(alignment_hint, os::vm_page_size())); // see above
2086 const size_t extra_size = size + alignment_hint;
2087
2088 // Note: MAP_SHARED (instead of MAP_PRIVATE) needed to be able to
2089 // later use msync(MS_INVALIDATE) (see os::uncommit_memory).
2090 int flags = MAP_ANONYMOUS | MAP_SHARED;
2091
2092 // MAP_FIXED is needed to enforce requested_addr - manpage is vague about what
2093 // it means if wishaddress is given but MAP_FIXED is not set.
2094 //
2095 // Important! Behaviour differs depending on whether SPEC1170 mode is active or not.
2096 // SPEC1170 mode active: behaviour like POSIX, MAP_FIXED will clobber existing mappings.
2097 // SPEC1170 mode not active: behaviour, unlike POSIX, is that no existing mappings will
2098 // get clobbered.
2099 if (requested_addr != NULL) {
2100 if (!os::Aix::xpg_sus_mode()) { // not SPEC1170 Behaviour
2101 flags |= MAP_FIXED;
2102 }
2103 }
2104
2105 char* addr = (char*)::mmap(requested_addr, extra_size,
2106 PROT_READ|PROT_WRITE|PROT_EXEC, flags, -1, 0);
2107
2108 if (addr == MAP_FAILED) {
2109 trcVerbose("mmap(" PTR_FORMAT ", " UINTX_FORMAT ", ..) failed (%d)", requested_addr, size, errno);
2110 return NULL;
2111 }
2112
2113 // Handle alignment.
2114 char* const addr_aligned = align_up(addr, alignment_hint);
2115 const size_t waste_pre = addr_aligned - addr;
2116 char* const addr_aligned_end = addr_aligned + size;
2117 const size_t waste_post = extra_size - waste_pre - size;
2118 if (waste_pre > 0) {
2119 ::munmap(addr, waste_pre);
2120 }
2121 if (waste_post > 0) {
2122 ::munmap(addr_aligned_end, waste_post);
2123 }
2124 addr = addr_aligned;
2125
2126 if (addr) {
2127 trcVerbose("mmap-allocated " PTR_FORMAT " .. " PTR_FORMAT " (" UINTX_FORMAT " bytes)",
2128 addr, addr + bytes, bytes);
2129 } else {
2130 if (requested_addr != NULL) {
2131 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at wish address " PTR_FORMAT ".", bytes, requested_addr);
2132 } else {
2133 trcVerbose("failed to mmap-allocate " UINTX_FORMAT " bytes at any address.", bytes);
2134 }
2135 }
2136
2137 // bookkeeping
2138 vmembk_add(addr, size, 4*K, VMEM_MAPPED);
2139
2140 // Test alignment, see above.
2141 assert0(is_aligned_to(addr, os::vm_page_size()));
2142
2143 return addr;
2144 }
2145
2146 static bool release_mmaped_memory(char* addr, size_t size) {
2147 assert0(is_aligned_to(addr, os::vm_page_size()));
2148 assert0(is_aligned_to(size, os::vm_page_size()));
2149
2150 trcVerbose("release_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2151 addr, addr + size - 1);
2152 bool rc = false;
2153
2154 if (::munmap(addr, size) != 0) {
2155 trcVerbose("failed (%d)\n", errno);
2156 rc = false;
2157 } else {
2158 trcVerbose("ok.");
2159 rc = true;
2160 }
2161
2162 return rc;
2163 }
2164
2165 static bool uncommit_mmaped_memory(char* addr, size_t size) {
2166
2167 assert0(is_aligned_to(addr, os::vm_page_size()));
2168 assert0(is_aligned_to(size, os::vm_page_size()));
2169
2170 trcVerbose("uncommit_mmaped_memory [" PTR_FORMAT " - " PTR_FORMAT "].",
2171 addr, addr + size - 1);
2172 bool rc = false;
2173
2174 // Uncommit mmap memory with msync MS_INVALIDATE.
2175 if (::msync(addr, size, MS_INVALIDATE) != 0) {
2176 trcVerbose("failed (%d)\n", errno);
2177 rc = false;
2178 } else {
2179 trcVerbose("ok.");
2180 rc = true;
2181 }
2182
2183 return rc;
2184 }
2185
2186 int os::vm_page_size() {
2187 // Seems redundant as all get out.
2188 assert(os::Aix::page_size() != -1, "must call os::init");
2189 return os::Aix::page_size();
2190 }
2191
2192 // Aix allocates memory by pages.
2193 int os::vm_allocation_granularity() {
2194 assert(os::Aix::page_size() != -1, "must call os::init");
2195 return os::Aix::page_size();
2196 }
2197
2198 #ifdef PRODUCT
2199 static void warn_fail_commit_memory(char* addr, size_t size, bool exec,
2200 int err) {
2201 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT
2202 ", %d) failed; error='%s' (errno=%d)", addr, size, exec,
2203 os::errno_name(err), err);
2204 }
2205 #endif
2206
2207 void os::pd_commit_memory_or_exit(char* addr, size_t size, bool exec,
2208 const char* mesg) {
2209 assert(mesg != NULL, "mesg must be specified");
2210 if (!pd_commit_memory(addr, size, exec)) {
2211 // Add extra info in product mode for vm_exit_out_of_memory():
2212 PRODUCT_ONLY(warn_fail_commit_memory(addr, size, exec, errno);)
2213 vm_exit_out_of_memory(size, OOM_MMAP_ERROR, "%s", mesg);
2214 }
2215 }
2216
2217 bool os::pd_commit_memory(char* addr, size_t size, bool exec) {
2218
2219 assert(is_aligned_to(addr, os::vm_page_size()),
2220 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2221 p2i(addr), os::vm_page_size());
2222 assert(is_aligned_to(size, os::vm_page_size()),
2223 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2224 size, os::vm_page_size());
2225
2226 vmembk_t* const vmi = vmembk_find(addr);
2227 guarantee0(vmi);
2228 vmi->assert_is_valid_subrange(addr, size);
2229
2230 trcVerbose("commit_memory [" PTR_FORMAT " - " PTR_FORMAT "].", addr, addr + size - 1);
2231
2232 if (UseExplicitCommit) {
2233 // AIX commits memory on touch. So, touch all pages to be committed.
2234 for (char* p = addr; p < (addr + size); p += 4*K) {
2235 *p = '\0';
2236 }
2237 }
2238
2239 return true;
2240 }
2241
2242 bool os::pd_commit_memory(char* addr, size_t size, size_t alignment_hint, bool exec) {
2243 return pd_commit_memory(addr, size, exec);
2244 }
2245
2246 void os::pd_commit_memory_or_exit(char* addr, size_t size,
2247 size_t alignment_hint, bool exec,
2248 const char* mesg) {
2249 // Alignment_hint is ignored on this OS.
2250 pd_commit_memory_or_exit(addr, size, exec, mesg);
2251 }
2252
2253 bool os::pd_uncommit_memory(char* addr, size_t size) {
2254 assert(is_aligned_to(addr, os::vm_page_size()),
2255 "addr " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2256 p2i(addr), os::vm_page_size());
2257 assert(is_aligned_to(size, os::vm_page_size()),
2258 "size " PTR_FORMAT " not aligned to vm_page_size (" PTR_FORMAT ")",
2259 size, os::vm_page_size());
2260
2261 // Dynamically do different things for mmap/shmat.
2262 const vmembk_t* const vmi = vmembk_find(addr);
2263 guarantee0(vmi);
2264 vmi->assert_is_valid_subrange(addr, size);
2265
2266 if (vmi->type == VMEM_SHMATED) {
2267 return uncommit_shmated_memory(addr, size);
2268 } else {
2269 return uncommit_mmaped_memory(addr, size);
2270 }
2271 }
2272
2273 bool os::pd_create_stack_guard_pages(char* addr, size_t size) {
2274 // Do not call this; no need to commit stack pages on AIX.
2275 ShouldNotReachHere();
2276 return true;
2277 }
2278
2279 bool os::remove_stack_guard_pages(char* addr, size_t size) {
2280 // Do not call this; no need to commit stack pages on AIX.
2281 ShouldNotReachHere();
2282 return true;
2283 }
2284
2285 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) {
2286 }
2287
2288 void os::pd_free_memory(char *addr, size_t bytes, size_t alignment_hint) {
2289 }
2290
2291 void os::numa_make_global(char *addr, size_t bytes) {
2292 }
2293
2294 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) {
2295 }
2296
2297 bool os::numa_topology_changed() {
2298 return false;
2299 }
2300
2301 size_t os::numa_get_groups_num() {
2302 return 1;
2303 }
2304
2305 int os::numa_get_group_id() {
2306 return 0;
2307 }
2308
2309 size_t os::numa_get_leaf_groups(int *ids, size_t size) {
2310 if (size > 0) {
2311 ids[0] = 0;
2312 return 1;
2313 }
2314 return 0;
2315 }
2316
2317 bool os::get_page_info(char *start, page_info* info) {
2318 return false;
2319 }
2320
2321 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) {
2322 return end;
2323 }
2324
2325 // Reserves and attaches a shared memory segment.
2326 // Will assert if a wish address is given and could not be obtained.
2327 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) {
2328
2329 // All other Unices do a mmap(MAP_FIXED) if the addr is given,
2330 // thereby clobbering old mappings at that place. That is probably
2331 // not intended, never used and almost certainly an error were it
2332 // ever be used this way (to try attaching at a specified address
2333 // without clobbering old mappings an alternate API exists,
2334 // os::attempt_reserve_memory_at()).
2335 // Instead of mimicking the dangerous coding of the other platforms, here I
2336 // just ignore the request address (release) or assert(debug).
2337 assert0(requested_addr == NULL);
2338
2339 // Always round to os::vm_page_size(), which may be larger than 4K.
2340 bytes = align_up(bytes, os::vm_page_size());
2341 const size_t alignment_hint0 =
2342 alignment_hint ? align_up(alignment_hint, os::vm_page_size()) : 0;
2343
2344 // In 4K mode always use mmap.
2345 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2346 if (os::vm_page_size() == 4*K) {
2347 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2348 } else {
2349 if (bytes >= Use64KPagesThreshold) {
2350 return reserve_shmated_memory(bytes, requested_addr, alignment_hint);
2351 } else {
2352 return reserve_mmaped_memory(bytes, requested_addr, alignment_hint);
2353 }
2354 }
2355 }
2356
2357 bool os::pd_release_memory(char* addr, size_t size) {
2358
2359 // Dynamically do different things for mmap/shmat.
2360 vmembk_t* const vmi = vmembk_find(addr);
2361 guarantee0(vmi);
2362
2363 // Always round to os::vm_page_size(), which may be larger than 4K.
2364 size = align_up(size, os::vm_page_size());
2365 addr = align_up(addr, os::vm_page_size());
2366
2367 bool rc = false;
2368 bool remove_bookkeeping = false;
2369 if (vmi->type == VMEM_SHMATED) {
2370 // For shmatted memory, we do:
2371 // - If user wants to release the whole range, release the memory (shmdt).
2372 // - If user only wants to release a partial range, uncommit (disclaim) that
2373 // range. That way, at least, we do not use memory anymore (bust still page
2374 // table space).
2375 vmi->assert_is_valid_subrange(addr, size);
2376 if (addr == vmi->addr && size == vmi->size) {
2377 rc = release_shmated_memory(addr, size);
2378 remove_bookkeeping = true;
2379 } else {
2380 rc = uncommit_shmated_memory(addr, size);
2381 }
2382 } else {
2383 // User may unmap partial regions but region has to be fully contained.
2384 #ifdef ASSERT
2385 vmi->assert_is_valid_subrange(addr, size);
2386 #endif
2387 rc = release_mmaped_memory(addr, size);
2388 remove_bookkeeping = true;
2389 }
2390
2391 // update bookkeeping
2392 if (rc && remove_bookkeeping) {
2393 vmembk_remove(vmi);
2394 }
2395
2396 return rc;
2397 }
2398
2399 static bool checked_mprotect(char* addr, size_t size, int prot) {
2400
2401 // Little problem here: if SPEC1170 behaviour is off, mprotect() on AIX will
2402 // not tell me if protection failed when trying to protect an un-protectable range.
2403 //
2404 // This means if the memory was allocated using shmget/shmat, protection wont work
2405 // but mprotect will still return 0:
2406 //
2407 // See http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/mprotect.htm
2408
2409 bool rc = ::mprotect(addr, size, prot) == 0 ? true : false;
2410
2411 if (!rc) {
2412 const char* const s_errno = os::errno_name(errno);
2413 warning("mprotect(" PTR_FORMAT "-" PTR_FORMAT ", 0x%X) failed (%s).", addr, addr + size, prot, s_errno);
2414 return false;
2415 }
2416
2417 // mprotect success check
2418 //
2419 // Mprotect said it changed the protection but can I believe it?
2420 //
2421 // To be sure I need to check the protection afterwards. Try to
2422 // read from protected memory and check whether that causes a segfault.
2423 //
2424 if (!os::Aix::xpg_sus_mode()) {
2425
2426 if (CanUseSafeFetch32()) {
2427
2428 const bool read_protected =
2429 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2430 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2431
2432 if (prot & PROT_READ) {
2433 rc = !read_protected;
2434 } else {
2435 rc = read_protected;
2436 }
2437
2438 if (!rc) {
2439 if (os::Aix::on_pase()) {
2440 // There is an issue on older PASE systems where mprotect() will return success but the
2441 // memory will not be protected.
2442 // This has nothing to do with the problem of using mproect() on SPEC1170 incompatible
2443 // machines; we only see it rarely, when using mprotect() to protect the guard page of
2444 // a stack. It is an OS error.
2445 //
2446 // A valid strategy is just to try again. This usually works. :-/
2447
2448 ::usleep(1000);
2449 if (::mprotect(addr, size, prot) == 0) {
2450 const bool read_protected_2 =
2451 (SafeFetch32((int*)addr, 0x12345678) == 0x12345678 &&
2452 SafeFetch32((int*)addr, 0x76543210) == 0x76543210) ? true : false;
2453 rc = true;
2454 }
2455 }
2456 }
2457 }
2458 }
2459
2460 assert(rc == true, "mprotect failed.");
2461
2462 return rc;
2463 }
2464
2465 // Set protections specified
2466 bool os::protect_memory(char* addr, size_t size, ProtType prot, bool is_committed) {
2467 unsigned int p = 0;
2468 switch (prot) {
2469 case MEM_PROT_NONE: p = PROT_NONE; break;
2470 case MEM_PROT_READ: p = PROT_READ; break;
2471 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break;
2472 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break;
2473 default:
2474 ShouldNotReachHere();
2475 }
2476 // is_committed is unused.
2477 return checked_mprotect(addr, size, p);
2478 }
2479
2480 bool os::guard_memory(char* addr, size_t size) {
2481 return checked_mprotect(addr, size, PROT_NONE);
2482 }
2483
2484 bool os::unguard_memory(char* addr, size_t size) {
2485 return checked_mprotect(addr, size, PROT_READ|PROT_WRITE|PROT_EXEC);
2486 }
2487
2488 // Large page support
2489
2490 static size_t _large_page_size = 0;
2491
2492 // Enable large page support if OS allows that.
2493 void os::large_page_init() {
2494 return; // Nothing to do. See query_multipage_support and friends.
2495 }
2496
2497 char* os::reserve_memory_special(size_t bytes, size_t alignment, char* req_addr, bool exec) {
2498 // reserve_memory_special() is used to allocate large paged memory. On AIX, we implement
2499 // 64k paged memory reservation using the normal memory allocation paths (os::reserve_memory()),
2500 // so this is not needed.
2501 assert(false, "should not be called on AIX");
2502 return NULL;
2503 }
2504
2505 bool os::release_memory_special(char* base, size_t bytes) {
2506 // Detaching the SHM segment will also delete it, see reserve_memory_special().
2507 Unimplemented();
2508 return false;
2509 }
2510
2511 size_t os::large_page_size() {
2512 return _large_page_size;
2513 }
2514
2515 bool os::can_commit_large_page_memory() {
2516 // Does not matter, we do not support huge pages.
2517 return false;
2518 }
2519
2520 bool os::can_execute_large_page_memory() {
2521 // Does not matter, we do not support huge pages.
2522 return false;
2523 }
2524
2525 // Reserve memory at an arbitrary address, only if that area is
2526 // available (and not reserved for something else).
2527 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) {
2528 char* addr = NULL;
2529
2530 // Always round to os::vm_page_size(), which may be larger than 4K.
2531 bytes = align_up(bytes, os::vm_page_size());
2532
2533 // In 4K mode always use mmap.
2534 // In 64K mode allocate small sizes with mmap, large ones with 64K shmatted.
2535 if (os::vm_page_size() == 4*K) {
2536 return reserve_mmaped_memory(bytes, requested_addr, 0);
2537 } else {
2538 if (bytes >= Use64KPagesThreshold) {
2539 return reserve_shmated_memory(bytes, requested_addr, 0);
2540 } else {
2541 return reserve_mmaped_memory(bytes, requested_addr, 0);
2542 }
2543 }
2544
2545 return addr;
2546 }
2547
2548 size_t os::read(int fd, void *buf, unsigned int nBytes) {
2549 return ::read(fd, buf, nBytes);
2550 }
2551
2552 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
2553 return ::pread(fd, buf, nBytes, offset);
2554 }
2555
2556 void os::naked_short_sleep(jlong ms) {
2557 struct timespec req;
2558
2559 assert(ms < 1000, "Un-interruptable sleep, short time use only");
2560 req.tv_sec = 0;
2561 if (ms > 0) {
2562 req.tv_nsec = (ms % 1000) * 1000000;
2563 }
2564 else {
2565 req.tv_nsec = 1;
2566 }
2567
2568 nanosleep(&req, NULL);
2569
2570 return;
2571 }
2572
2573 // Sleep forever; naked call to OS-specific sleep; use with CAUTION
2574 void os::infinite_sleep() {
2575 while (true) { // sleep forever ...
2576 ::sleep(100); // ... 100 seconds at a time
2577 }
2578 }
2579
2580 // Used to convert frequent JVM_Yield() to nops
2581 bool os::dont_yield() {
2582 return DontYieldALot;
2583 }
2584
2585 void os::naked_yield() {
2586 sched_yield();
2587 }
2588
2589 ////////////////////////////////////////////////////////////////////////////////
2590 // thread priority support
2591
2592 // From AIX manpage to pthread_setschedparam
2593 // (see: http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?
2594 // topic=/com.ibm.aix.basetechref/doc/basetrf1/pthread_setschedparam.htm):
2595 //
2596 // "If schedpolicy is SCHED_OTHER, then sched_priority must be in the
2597 // range from 40 to 80, where 40 is the least favored priority and 80
2598 // is the most favored."
2599 //
2600 // (Actually, I doubt this even has an impact on AIX, as we do kernel
2601 // scheduling there; however, this still leaves iSeries.)
2602 //
2603 // We use the same values for AIX and PASE.
2604 int os::java_to_os_priority[CriticalPriority + 1] = {
2605 54, // 0 Entry should never be used
2606
2607 55, // 1 MinPriority
2608 55, // 2
2609 56, // 3
2610
2611 56, // 4
2612 57, // 5 NormPriority
2613 57, // 6
2614
2615 58, // 7
2616 58, // 8
2617 59, // 9 NearMaxPriority
2618
2619 60, // 10 MaxPriority
2620
2621 60 // 11 CriticalPriority
2622 };
2623
2624 OSReturn os::set_native_priority(Thread* thread, int newpri) {
2625 if (!UseThreadPriorities) return OS_OK;
2626 pthread_t thr = thread->osthread()->pthread_id();
2627 int policy = SCHED_OTHER;
2628 struct sched_param param;
2629 param.sched_priority = newpri;
2630 int ret = pthread_setschedparam(thr, policy, ¶m);
2631
2632 if (ret != 0) {
2633 trcVerbose("Could not change priority for thread %d to %d (error %d, %s)",
2634 (int)thr, newpri, ret, os::errno_name(ret));
2635 }
2636 return (ret == 0) ? OS_OK : OS_ERR;
2637 }
2638
2639 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) {
2640 if (!UseThreadPriorities) {
2641 *priority_ptr = java_to_os_priority[NormPriority];
2642 return OS_OK;
2643 }
2644 pthread_t thr = thread->osthread()->pthread_id();
2645 int policy = SCHED_OTHER;
2646 struct sched_param param;
2647 int ret = pthread_getschedparam(thr, &policy, ¶m);
2648 *priority_ptr = param.sched_priority;
2649
2650 return (ret == 0) ? OS_OK : OS_ERR;
2651 }
2652
2653 // Hint to the underlying OS that a task switch would not be good.
2654 // Void return because it's a hint and can fail.
2655 void os::hint_no_preempt() {}
2656
2657 ////////////////////////////////////////////////////////////////////////////////
2658 // suspend/resume support
2659
2660 // the low-level signal-based suspend/resume support is a remnant from the
2661 // old VM-suspension that used to be for java-suspension, safepoints etc,
2662 // within hotspot. Now there is a single use-case for this:
2663 // - calling get_thread_pc() on the VMThread by the flat-profiler task
2664 // that runs in the watcher thread.
2665 // The remaining code is greatly simplified from the more general suspension
2666 // code that used to be used.
2667 //
2668 // The protocol is quite simple:
2669 // - suspend:
2670 // - sends a signal to the target thread
2671 // - polls the suspend state of the osthread using a yield loop
2672 // - target thread signal handler (SR_handler) sets suspend state
2673 // and blocks in sigsuspend until continued
2674 // - resume:
2675 // - sets target osthread state to continue
2676 // - sends signal to end the sigsuspend loop in the SR_handler
2677 //
2678 // Note that the SR_lock plays no role in this suspend/resume protocol,
2679 // but is checked for NULL in SR_handler as a thread termination indicator.
2680 //
2681
2682 static void resume_clear_context(OSThread *osthread) {
2683 osthread->set_ucontext(NULL);
2684 osthread->set_siginfo(NULL);
2685 }
2686
2687 static void suspend_save_context(OSThread *osthread, siginfo_t* siginfo, ucontext_t* context) {
2688 osthread->set_ucontext(context);
2689 osthread->set_siginfo(siginfo);
2690 }
2691
2692 //
2693 // Handler function invoked when a thread's execution is suspended or
2694 // resumed. We have to be careful that only async-safe functions are
2695 // called here (Note: most pthread functions are not async safe and
2696 // should be avoided.)
2697 //
2698 // Note: sigwait() is a more natural fit than sigsuspend() from an
2699 // interface point of view, but sigwait() prevents the signal hander
2700 // from being run. libpthread would get very confused by not having
2701 // its signal handlers run and prevents sigwait()'s use with the
2702 // mutex granting granting signal.
2703 //
2704 // Currently only ever called on the VMThread and JavaThreads (PC sampling).
2705 //
2706 static void SR_handler(int sig, siginfo_t* siginfo, ucontext_t* context) {
2707 // Save and restore errno to avoid confusing native code with EINTR
2708 // after sigsuspend.
2709 int old_errno = errno;
2710
2711 Thread* thread = Thread::current_or_null_safe();
2712 assert(thread != NULL, "Missing current thread in SR_handler");
2713
2714 // On some systems we have seen signal delivery get "stuck" until the signal
2715 // mask is changed as part of thread termination. Check that the current thread
2716 // has not already terminated (via SR_lock()) - else the following assertion
2717 // will fail because the thread is no longer a JavaThread as the ~JavaThread
2718 // destructor has completed.
2719
2720 if (thread->SR_lock() == NULL) {
2721 return;
2722 }
2723
2724 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread");
2725
2726 OSThread* osthread = thread->osthread();
2727
2728 os::SuspendResume::State current = osthread->sr.state();
2729 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) {
2730 suspend_save_context(osthread, siginfo, context);
2731
2732 // attempt to switch the state, we assume we had a SUSPEND_REQUEST
2733 os::SuspendResume::State state = osthread->sr.suspended();
2734 if (state == os::SuspendResume::SR_SUSPENDED) {
2735 sigset_t suspend_set; // signals for sigsuspend()
2736
2737 // get current set of blocked signals and unblock resume signal
2738 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set);
2739 sigdelset(&suspend_set, SR_signum);
2740
2741 // wait here until we are resumed
2742 while (1) {
2743 sigsuspend(&suspend_set);
2744
2745 os::SuspendResume::State result = osthread->sr.running();
2746 if (result == os::SuspendResume::SR_RUNNING) {
2747 break;
2748 }
2749 }
2750
2751 } else if (state == os::SuspendResume::SR_RUNNING) {
2752 // request was cancelled, continue
2753 } else {
2754 ShouldNotReachHere();
2755 }
2756
2757 resume_clear_context(osthread);
2758 } else if (current == os::SuspendResume::SR_RUNNING) {
2759 // request was cancelled, continue
2760 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) {
2761 // ignore
2762 } else {
2763 ShouldNotReachHere();
2764 }
2765
2766 errno = old_errno;
2767 }
2768
2769 static int SR_initialize() {
2770 struct sigaction act;
2771 char *s;
2772 // Get signal number to use for suspend/resume
2773 if ((s = ::getenv("_JAVA_SR_SIGNUM")) != 0) {
2774 int sig = ::strtol(s, 0, 10);
2775 if (sig > MAX2(SIGSEGV, SIGBUS) && // See 4355769.
2776 sig < NSIG) { // Must be legal signal and fit into sigflags[].
2777 SR_signum = sig;
2778 } else {
2779 warning("You set _JAVA_SR_SIGNUM=%d. It must be in range [%d, %d]. Using %d instead.",
2780 sig, MAX2(SIGSEGV, SIGBUS)+1, NSIG-1, SR_signum);
2781 }
2782 }
2783
2784 assert(SR_signum > SIGSEGV && SR_signum > SIGBUS,
2785 "SR_signum must be greater than max(SIGSEGV, SIGBUS), see 4355769");
2786
2787 sigemptyset(&SR_sigset);
2788 sigaddset(&SR_sigset, SR_signum);
2789
2790 // Set up signal handler for suspend/resume.
2791 act.sa_flags = SA_RESTART|SA_SIGINFO;
2792 act.sa_handler = (void (*)(int)) SR_handler;
2793
2794 // SR_signum is blocked by default.
2795 pthread_sigmask(SIG_BLOCK, NULL, &act.sa_mask);
2796
2797 if (sigaction(SR_signum, &act, 0) == -1) {
2798 return -1;
2799 }
2800
2801 // Save signal flag
2802 os::Aix::set_our_sigflags(SR_signum, act.sa_flags);
2803 return 0;
2804 }
2805
2806 static int SR_finalize() {
2807 return 0;
2808 }
2809
2810 static int sr_notify(OSThread* osthread) {
2811 int status = pthread_kill(osthread->pthread_id(), SR_signum);
2812 assert_status(status == 0, status, "pthread_kill");
2813 return status;
2814 }
2815
2816 // "Randomly" selected value for how long we want to spin
2817 // before bailing out on suspending a thread, also how often
2818 // we send a signal to a thread we want to resume
2819 static const int RANDOMLY_LARGE_INTEGER = 1000000;
2820 static const int RANDOMLY_LARGE_INTEGER2 = 100;
2821
2822 // returns true on success and false on error - really an error is fatal
2823 // but this seems the normal response to library errors
2824 static bool do_suspend(OSThread* osthread) {
2825 assert(osthread->sr.is_running(), "thread should be running");
2826 // mark as suspended and send signal
2827
2828 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) {
2829 // failed to switch, state wasn't running?
2830 ShouldNotReachHere();
2831 return false;
2832 }
2833
2834 if (sr_notify(osthread) != 0) {
2835 // try to cancel, switch to running
2836
2837 os::SuspendResume::State result = osthread->sr.cancel_suspend();
2838 if (result == os::SuspendResume::SR_RUNNING) {
2839 // cancelled
2840 return false;
2841 } else if (result == os::SuspendResume::SR_SUSPENDED) {
2842 // somehow managed to suspend
2843 return true;
2844 } else {
2845 ShouldNotReachHere();
2846 return false;
2847 }
2848 }
2849
2850 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED
2851
2852 for (int n = 0; !osthread->sr.is_suspended(); n++) {
2853 for (int i = 0; i < RANDOMLY_LARGE_INTEGER2 && !osthread->sr.is_suspended(); i++) {
2854 os::naked_yield();
2855 }
2856
2857 // timeout, try to cancel the request
2858 if (n >= RANDOMLY_LARGE_INTEGER) {
2859 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend();
2860 if (cancelled == os::SuspendResume::SR_RUNNING) {
2861 return false;
2862 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) {
2863 return true;
2864 } else {
2865 ShouldNotReachHere();
2866 return false;
2867 }
2868 }
2869 }
2870
2871 guarantee(osthread->sr.is_suspended(), "Must be suspended");
2872 return true;
2873 }
2874
2875 static void do_resume(OSThread* osthread) {
2876 //assert(osthread->sr.is_suspended(), "thread should be suspended");
2877
2878 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) {
2879 // failed to switch to WAKEUP_REQUEST
2880 ShouldNotReachHere();
2881 return;
2882 }
2883
2884 while (!osthread->sr.is_running()) {
2885 if (sr_notify(osthread) == 0) {
2886 for (int n = 0; n < RANDOMLY_LARGE_INTEGER && !osthread->sr.is_running(); n++) {
2887 for (int i = 0; i < 100 && !osthread->sr.is_running(); i++) {
2888 os::naked_yield();
2889 }
2890 }
2891 } else {
2892 ShouldNotReachHere();
2893 }
2894 }
2895
2896 guarantee(osthread->sr.is_running(), "Must be running!");
2897 }
2898
2899 ///////////////////////////////////////////////////////////////////////////////////
2900 // signal handling (except suspend/resume)
2901
2902 // This routine may be used by user applications as a "hook" to catch signals.
2903 // The user-defined signal handler must pass unrecognized signals to this
2904 // routine, and if it returns true (non-zero), then the signal handler must
2905 // return immediately. If the flag "abort_if_unrecognized" is true, then this
2906 // routine will never retun false (zero), but instead will execute a VM panic
2907 // routine kill the process.
2908 //
2909 // If this routine returns false, it is OK to call it again. This allows
2910 // the user-defined signal handler to perform checks either before or after
2911 // the VM performs its own checks. Naturally, the user code would be making
2912 // a serious error if it tried to handle an exception (such as a null check
2913 // or breakpoint) that the VM was generating for its own correct operation.
2914 //
2915 // This routine may recognize any of the following kinds of signals:
2916 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, SIGQUIT, SIGPIPE, SIGXFSZ, SIGUSR1.
2917 // It should be consulted by handlers for any of those signals.
2918 //
2919 // The caller of this routine must pass in the three arguments supplied
2920 // to the function referred to in the "sa_sigaction" (not the "sa_handler")
2921 // field of the structure passed to sigaction(). This routine assumes that
2922 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART.
2923 //
2924 // Note that the VM will print warnings if it detects conflicting signal
2925 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
2926 //
2927 extern "C" JNIEXPORT int
2928 JVM_handle_aix_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
2929
2930 // Set thread signal mask (for some reason on AIX sigthreadmask() seems
2931 // to be the thing to call; documentation is not terribly clear about whether
2932 // pthread_sigmask also works, and if it does, whether it does the same.
2933 bool set_thread_signal_mask(int how, const sigset_t* set, sigset_t* oset) {
2934 const int rc = ::pthread_sigmask(how, set, oset);
2935 // return value semantics differ slightly for error case:
2936 // pthread_sigmask returns error number, sigthreadmask -1 and sets global errno
2937 // (so, pthread_sigmask is more theadsafe for error handling)
2938 // But success is always 0.
2939 return rc == 0 ? true : false;
2940 }
2941
2942 // Function to unblock all signals which are, according
2943 // to POSIX, typical program error signals. If they happen while being blocked,
2944 // they typically will bring down the process immediately.
2945 bool unblock_program_error_signals() {
2946 sigset_t set;
2947 ::sigemptyset(&set);
2948 ::sigaddset(&set, SIGILL);
2949 ::sigaddset(&set, SIGBUS);
2950 ::sigaddset(&set, SIGFPE);
2951 ::sigaddset(&set, SIGSEGV);
2952 return set_thread_signal_mask(SIG_UNBLOCK, &set, NULL);
2953 }
2954
2955 // Renamed from 'signalHandler' to avoid collision with other shared libs.
2956 void javaSignalHandler(int sig, siginfo_t* info, void* uc) {
2957 assert(info != NULL && uc != NULL, "it must be old kernel");
2958
2959 // Never leave program error signals blocked;
2960 // on all our platforms they would bring down the process immediately when
2961 // getting raised while being blocked.
2962 unblock_program_error_signals();
2963
2964 int orig_errno = errno; // Preserve errno value over signal handler.
2965 JVM_handle_aix_signal(sig, info, uc, true);
2966 errno = orig_errno;
2967 }
2968
2969 // This boolean allows users to forward their own non-matching signals
2970 // to JVM_handle_aix_signal, harmlessly.
2971 bool os::Aix::signal_handlers_are_installed = false;
2972
2973 // For signal-chaining
2974 struct sigaction sigact[NSIG];
2975 sigset_t sigs;
2976 bool os::Aix::libjsig_is_loaded = false;
2977 typedef struct sigaction *(*get_signal_t)(int);
2978 get_signal_t os::Aix::get_signal_action = NULL;
2979
2980 struct sigaction* os::Aix::get_chained_signal_action(int sig) {
2981 struct sigaction *actp = NULL;
2982
2983 if (libjsig_is_loaded) {
2984 // Retrieve the old signal handler from libjsig
2985 actp = (*get_signal_action)(sig);
2986 }
2987 if (actp == NULL) {
2988 // Retrieve the preinstalled signal handler from jvm
2989 actp = get_preinstalled_handler(sig);
2990 }
2991
2992 return actp;
2993 }
2994
2995 static bool call_chained_handler(struct sigaction *actp, int sig,
2996 siginfo_t *siginfo, void *context) {
2997 // Call the old signal handler
2998 if (actp->sa_handler == SIG_DFL) {
2999 // It's more reasonable to let jvm treat it as an unexpected exception
3000 // instead of taking the default action.
3001 return false;
3002 } else if (actp->sa_handler != SIG_IGN) {
3003 if ((actp->sa_flags & SA_NODEFER) == 0) {
3004 // automaticlly block the signal
3005 sigaddset(&(actp->sa_mask), sig);
3006 }
3007
3008 sa_handler_t hand = NULL;
3009 sa_sigaction_t sa = NULL;
3010 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0;
3011 // retrieve the chained handler
3012 if (siginfo_flag_set) {
3013 sa = actp->sa_sigaction;
3014 } else {
3015 hand = actp->sa_handler;
3016 }
3017
3018 if ((actp->sa_flags & SA_RESETHAND) != 0) {
3019 actp->sa_handler = SIG_DFL;
3020 }
3021
3022 // try to honor the signal mask
3023 sigset_t oset;
3024 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset);
3025
3026 // call into the chained handler
3027 if (siginfo_flag_set) {
3028 (*sa)(sig, siginfo, context);
3029 } else {
3030 (*hand)(sig);
3031 }
3032
3033 // restore the signal mask
3034 pthread_sigmask(SIG_SETMASK, &oset, 0);
3035 }
3036 // Tell jvm's signal handler the signal is taken care of.
3037 return true;
3038 }
3039
3040 bool os::Aix::chained_handler(int sig, siginfo_t* siginfo, void* context) {
3041 bool chained = false;
3042 // signal-chaining
3043 if (UseSignalChaining) {
3044 struct sigaction *actp = get_chained_signal_action(sig);
3045 if (actp != NULL) {
3046 chained = call_chained_handler(actp, sig, siginfo, context);
3047 }
3048 }
3049 return chained;
3050 }
3051
3052 size_t os::Aix::default_guard_size(os::ThreadType thr_type) {
3053 // Creating guard page is very expensive. Java thread has HotSpot
3054 // guard pages, only enable glibc guard page for non-Java threads.
3055 // (Remember: compiler thread is a Java thread, too!)
3056 //
3057 // Aix can have different page sizes for stack (4K) and heap (64K).
3058 // As Hotspot knows only one page size, we assume the stack has
3059 // the same page size as the heap. Returning page_size() here can
3060 // cause 16 guard pages which we want to avoid. Thus we return 4K
3061 // which will be rounded to the real page size by the OS.
3062 return ((thr_type == java_thread || thr_type == compiler_thread) ? 0 : 4 * K);
3063 }
3064
3065 struct sigaction* os::Aix::get_preinstalled_handler(int sig) {
3066 if (sigismember(&sigs, sig)) {
3067 return &sigact[sig];
3068 }
3069 return NULL;
3070 }
3071
3072 void os::Aix::save_preinstalled_handler(int sig, struct sigaction& oldAct) {
3073 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3074 sigact[sig] = oldAct;
3075 sigaddset(&sigs, sig);
3076 }
3077
3078 // for diagnostic
3079 int sigflags[NSIG];
3080
3081 int os::Aix::get_our_sigflags(int sig) {
3082 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3083 return sigflags[sig];
3084 }
3085
3086 void os::Aix::set_our_sigflags(int sig, int flags) {
3087 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3088 if (sig > 0 && sig < NSIG) {
3089 sigflags[sig] = flags;
3090 }
3091 }
3092
3093 void os::Aix::set_signal_handler(int sig, bool set_installed) {
3094 // Check for overwrite.
3095 struct sigaction oldAct;
3096 sigaction(sig, (struct sigaction*)NULL, &oldAct);
3097
3098 void* oldhand = oldAct.sa_sigaction
3099 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3100 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3101 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) &&
3102 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) &&
3103 oldhand != CAST_FROM_FN_PTR(void*, (sa_sigaction_t)javaSignalHandler)) {
3104 if (AllowUserSignalHandlers || !set_installed) {
3105 // Do not overwrite; user takes responsibility to forward to us.
3106 return;
3107 } else if (UseSignalChaining) {
3108 // save the old handler in jvm
3109 save_preinstalled_handler(sig, oldAct);
3110 // libjsig also interposes the sigaction() call below and saves the
3111 // old sigaction on it own.
3112 } else {
3113 fatal("Encountered unexpected pre-existing sigaction handler "
3114 "%#lx for signal %d.", (long)oldhand, sig);
3115 }
3116 }
3117
3118 struct sigaction sigAct;
3119 sigfillset(&(sigAct.sa_mask));
3120 if (!set_installed) {
3121 sigAct.sa_handler = SIG_DFL;
3122 sigAct.sa_flags = SA_RESTART;
3123 } else {
3124 sigAct.sa_sigaction = javaSignalHandler;
3125 sigAct.sa_flags = SA_SIGINFO|SA_RESTART;
3126 }
3127 // Save flags, which are set by ours
3128 assert(sig > 0 && sig < NSIG, "vm signal out of expected range");
3129 sigflags[sig] = sigAct.sa_flags;
3130
3131 int ret = sigaction(sig, &sigAct, &oldAct);
3132 assert(ret == 0, "check");
3133
3134 void* oldhand2 = oldAct.sa_sigaction
3135 ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
3136 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
3137 assert(oldhand2 == oldhand, "no concurrent signal handler installation");
3138 }
3139
3140 // install signal handlers for signals that HotSpot needs to
3141 // handle in order to support Java-level exception handling.
3142 void os::Aix::install_signal_handlers() {
3143 if (!signal_handlers_are_installed) {
3144 signal_handlers_are_installed = true;
3145
3146 // signal-chaining
3147 typedef void (*signal_setting_t)();
3148 signal_setting_t begin_signal_setting = NULL;
3149 signal_setting_t end_signal_setting = NULL;
3150 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3151 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting"));
3152 if (begin_signal_setting != NULL) {
3153 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t,
3154 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting"));
3155 get_signal_action = CAST_TO_FN_PTR(get_signal_t,
3156 dlsym(RTLD_DEFAULT, "JVM_get_signal_action"));
3157 libjsig_is_loaded = true;
3158 assert(UseSignalChaining, "should enable signal-chaining");
3159 }
3160 if (libjsig_is_loaded) {
3161 // Tell libjsig jvm is setting signal handlers.
3162 (*begin_signal_setting)();
3163 }
3164
3165 ::sigemptyset(&sigs);
3166 set_signal_handler(SIGSEGV, true);
3167 set_signal_handler(SIGPIPE, true);
3168 set_signal_handler(SIGBUS, true);
3169 set_signal_handler(SIGILL, true);
3170 set_signal_handler(SIGFPE, true);
3171 set_signal_handler(SIGTRAP, true);
3172 set_signal_handler(SIGXFSZ, true);
3173
3174 if (libjsig_is_loaded) {
3175 // Tell libjsig jvm finishes setting signal handlers.
3176 (*end_signal_setting)();
3177 }
3178
3179 // We don't activate signal checker if libjsig is in place, we trust ourselves
3180 // and if UserSignalHandler is installed all bets are off.
3181 // Log that signal checking is off only if -verbose:jni is specified.
3182 if (CheckJNICalls) {
3183 if (libjsig_is_loaded) {
3184 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled");
3185 check_signals = false;
3186 }
3187 if (AllowUserSignalHandlers) {
3188 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled");
3189 check_signals = false;
3190 }
3191 // Need to initialize check_signal_done.
3192 ::sigemptyset(&check_signal_done);
3193 }
3194 }
3195 }
3196
3197 static const char* get_signal_handler_name(address handler,
3198 char* buf, int buflen) {
3199 int offset;
3200 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset);
3201 if (found) {
3202 // skip directory names
3203 const char *p1, *p2;
3204 p1 = buf;
3205 size_t len = strlen(os::file_separator());
3206 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len;
3207 // The way os::dll_address_to_library_name is implemented on Aix
3208 // right now, it always returns -1 for the offset which is not
3209 // terribly informative.
3210 // Will fix that. For now, omit the offset.
3211 jio_snprintf(buf, buflen, "%s", p1);
3212 } else {
3213 jio_snprintf(buf, buflen, PTR_FORMAT, handler);
3214 }
3215 return buf;
3216 }
3217
3218 static void print_signal_handler(outputStream* st, int sig,
3219 char* buf, size_t buflen) {
3220 struct sigaction sa;
3221 sigaction(sig, NULL, &sa);
3222
3223 st->print("%s: ", os::exception_name(sig, buf, buflen));
3224
3225 address handler = (sa.sa_flags & SA_SIGINFO)
3226 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
3227 : CAST_FROM_FN_PTR(address, sa.sa_handler);
3228
3229 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) {
3230 st->print("SIG_DFL");
3231 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) {
3232 st->print("SIG_IGN");
3233 } else {
3234 st->print("[%s]", get_signal_handler_name(handler, buf, buflen));
3235 }
3236
3237 // Print readable mask.
3238 st->print(", sa_mask[0]=");
3239 os::Posix::print_signal_set_short(st, &sa.sa_mask);
3240
3241 address rh = VMError::get_resetted_sighandler(sig);
3242 // May be, handler was resetted by VMError?
3243 if (rh != NULL) {
3244 handler = rh;
3245 sa.sa_flags = VMError::get_resetted_sigflags(sig);
3246 }
3247
3248 // Print textual representation of sa_flags.
3249 st->print(", sa_flags=");
3250 os::Posix::print_sa_flags(st, sa.sa_flags);
3251
3252 // Check: is it our handler?
3253 if (handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler) ||
3254 handler == CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler)) {
3255 // It is our signal handler.
3256 // Check for flags, reset system-used one!
3257 if ((int)sa.sa_flags != os::Aix::get_our_sigflags(sig)) {
3258 st->print(", flags was changed from " PTR32_FORMAT ", consider using jsig library",
3259 os::Aix::get_our_sigflags(sig));
3260 }
3261 }
3262 st->cr();
3263 }
3264
3265 #define DO_SIGNAL_CHECK(sig) \
3266 if (!sigismember(&check_signal_done, sig)) \
3267 os::Aix::check_signal_handler(sig)
3268
3269 // This method is a periodic task to check for misbehaving JNI applications
3270 // under CheckJNI, we can add any periodic checks here
3271
3272 void os::run_periodic_checks() {
3273
3274 if (check_signals == false) return;
3275
3276 // SEGV and BUS if overridden could potentially prevent
3277 // generation of hs*.log in the event of a crash, debugging
3278 // such a case can be very challenging, so we absolutely
3279 // check the following for a good measure:
3280 DO_SIGNAL_CHECK(SIGSEGV);
3281 DO_SIGNAL_CHECK(SIGILL);
3282 DO_SIGNAL_CHECK(SIGFPE);
3283 DO_SIGNAL_CHECK(SIGBUS);
3284 DO_SIGNAL_CHECK(SIGPIPE);
3285 DO_SIGNAL_CHECK(SIGXFSZ);
3286 if (UseSIGTRAP) {
3287 DO_SIGNAL_CHECK(SIGTRAP);
3288 }
3289
3290 // ReduceSignalUsage allows the user to override these handlers
3291 // see comments at the very top and jvm_solaris.h
3292 if (!ReduceSignalUsage) {
3293 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL);
3294 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL);
3295 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL);
3296 DO_SIGNAL_CHECK(BREAK_SIGNAL);
3297 }
3298
3299 DO_SIGNAL_CHECK(SR_signum);
3300 }
3301
3302 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *);
3303
3304 static os_sigaction_t os_sigaction = NULL;
3305
3306 void os::Aix::check_signal_handler(int sig) {
3307 char buf[O_BUFLEN];
3308 address jvmHandler = NULL;
3309
3310 struct sigaction act;
3311 if (os_sigaction == NULL) {
3312 // only trust the default sigaction, in case it has been interposed
3313 os_sigaction = CAST_TO_FN_PTR(os_sigaction_t, dlsym(RTLD_DEFAULT, "sigaction"));
3314 if (os_sigaction == NULL) return;
3315 }
3316
3317 os_sigaction(sig, (struct sigaction*)NULL, &act);
3318
3319 address thisHandler = (act.sa_flags & SA_SIGINFO)
3320 ? CAST_FROM_FN_PTR(address, act.sa_sigaction)
3321 : CAST_FROM_FN_PTR(address, act.sa_handler);
3322
3323 switch(sig) {
3324 case SIGSEGV:
3325 case SIGBUS:
3326 case SIGFPE:
3327 case SIGPIPE:
3328 case SIGILL:
3329 case SIGXFSZ:
3330 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)javaSignalHandler);
3331 break;
3332
3333 case SHUTDOWN1_SIGNAL:
3334 case SHUTDOWN2_SIGNAL:
3335 case SHUTDOWN3_SIGNAL:
3336 case BREAK_SIGNAL:
3337 jvmHandler = (address)user_handler();
3338 break;
3339
3340 default:
3341 if (sig == SR_signum) {
3342 jvmHandler = CAST_FROM_FN_PTR(address, (sa_sigaction_t)SR_handler);
3343 } else {
3344 return;
3345 }
3346 break;
3347 }
3348
3349 if (thisHandler != jvmHandler) {
3350 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN));
3351 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN));
3352 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN));
3353 // No need to check this sig any longer
3354 sigaddset(&check_signal_done, sig);
3355 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN
3356 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) {
3357 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell",
3358 exception_name(sig, buf, O_BUFLEN));
3359 }
3360 } else if (os::Aix::get_our_sigflags(sig) != 0 && (int)act.sa_flags != os::Aix::get_our_sigflags(sig)) {
3361 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN));
3362 tty->print("expected:");
3363 os::Posix::print_sa_flags(tty, os::Aix::get_our_sigflags(sig));
3364 tty->cr();
3365 tty->print(" found:");
3366 os::Posix::print_sa_flags(tty, act.sa_flags);
3367 tty->cr();
3368 // No need to check this sig any longer
3369 sigaddset(&check_signal_done, sig);
3370 }
3371
3372 // Dump all the signal
3373 if (sigismember(&check_signal_done, sig)) {
3374 print_signal_handlers(tty, buf, O_BUFLEN);
3375 }
3376 }
3377
3378 // To install functions for atexit system call
3379 extern "C" {
3380 static void perfMemory_exit_helper() {
3381 perfMemory_exit();
3382 }
3383 }
3384
3385 // This is called _before_ the most of global arguments have been parsed.
3386 void os::init(void) {
3387 // This is basic, we want to know if that ever changes.
3388 // (Shared memory boundary is supposed to be a 256M aligned.)
3389 assert(SHMLBA == ((uint64_t)0x10000000ULL)/*256M*/, "unexpected");
3390
3391 // Record process break at startup.
3392 g_brk_at_startup = (address) ::sbrk(0);
3393 assert(g_brk_at_startup != (address) -1, "sbrk failed");
3394
3395 // First off, we need to know whether we run on AIX or PASE, and
3396 // the OS level we run on.
3397 os::Aix::initialize_os_info();
3398
3399 // Scan environment (SPEC1170 behaviour, etc).
3400 os::Aix::scan_environment();
3401
3402 // Probe multipage support.
3403 query_multipage_support();
3404
3405 // Act like we only have one page size by eliminating corner cases which
3406 // we did not support very well anyway.
3407 // We have two input conditions:
3408 // 1) Data segment page size. This is controlled by linker setting (datapsize) on the
3409 // launcher, and/or by LDR_CNTRL environment variable. The latter overrules the linker
3410 // setting.
3411 // Data segment page size is important for us because it defines the thread stack page
3412 // size, which is needed for guard page handling, stack banging etc.
3413 // 2) The ability to allocate 64k pages dynamically. If this is a given, java heap can
3414 // and should be allocated with 64k pages.
3415 //
3416 // So, we do the following:
3417 // LDR_CNTRL can_use_64K_pages_dynamically what we do remarks
3418 // 4K no 4K old systems (aix 5.2, as/400 v5r4) or new systems with AME activated
3419 // 4k yes 64k (treat 4k stacks as 64k) different loader than java and standard settings
3420 // 64k no --- AIX 5.2 ? ---
3421 // 64k yes 64k new systems and standard java loader (we set datapsize=64k when linking)
3422
3423 // We explicitly leave no option to change page size, because only upgrading would work,
3424 // not downgrading (if stack page size is 64k you cannot pretend its 4k).
3425
3426 if (g_multipage_support.datapsize == 4*K) {
3427 // datapsize = 4K. Data segment, thread stacks are 4K paged.
3428 if (g_multipage_support.can_use_64K_pages) {
3429 // .. but we are able to use 64K pages dynamically.
3430 // This would be typical for java launchers which are not linked
3431 // with datapsize=64K (like, any other launcher but our own).
3432 //
3433 // In this case it would be smart to allocate the java heap with 64K
3434 // to get the performance benefit, and to fake 64k pages for the
3435 // data segment (when dealing with thread stacks).
3436 //
3437 // However, leave a possibility to downgrade to 4K, using
3438 // -XX:-Use64KPages.
3439 if (Use64KPages) {
3440 trcVerbose("64K page mode (faked for data segment)");
3441 Aix::_page_size = 64*K;
3442 } else {
3443 trcVerbose("4K page mode (Use64KPages=off)");
3444 Aix::_page_size = 4*K;
3445 }
3446 } else {
3447 // .. and not able to allocate 64k pages dynamically. Here, just
3448 // fall back to 4K paged mode and use mmap for everything.
3449 trcVerbose("4K page mode");
3450 Aix::_page_size = 4*K;
3451 FLAG_SET_ERGO(bool, Use64KPages, false);
3452 }
3453 } else {
3454 // datapsize = 64k. Data segment, thread stacks are 64k paged.
3455 // This normally means that we can allocate 64k pages dynamically.
3456 // (There is one special case where this may be false: EXTSHM=on.
3457 // but we decided to not support that mode).
3458 assert0(g_multipage_support.can_use_64K_pages);
3459 Aix::_page_size = 64*K;
3460 trcVerbose("64K page mode");
3461 FLAG_SET_ERGO(bool, Use64KPages, true);
3462 }
3463
3464 // For now UseLargePages is just ignored.
3465 FLAG_SET_ERGO(bool, UseLargePages, false);
3466 _page_sizes[0] = 0;
3467
3468 // debug trace
3469 trcVerbose("os::vm_page_size %s", describe_pagesize(os::vm_page_size()));
3470
3471 // Next, we need to initialize libo4 and libperfstat libraries.
3472 if (os::Aix::on_pase()) {
3473 os::Aix::initialize_libo4();
3474 } else {
3475 os::Aix::initialize_libperfstat();
3476 }
3477
3478 // Reset the perfstat information provided by ODM.
3479 if (os::Aix::on_aix()) {
3480 libperfstat::perfstat_reset();
3481 }
3482
3483 // Now initialze basic system properties. Note that for some of the values we
3484 // need libperfstat etc.
3485 os::Aix::initialize_system_info();
3486
3487 clock_tics_per_sec = sysconf(_SC_CLK_TCK);
3488
3489 init_random(1234567);
3490
3491 ThreadCritical::initialize();
3492
3493 // Main_thread points to the aboriginal thread.
3494 Aix::_main_thread = pthread_self();
3495
3496 initial_time_count = os::elapsed_counter();
3497
3498 os::Posix::init();
3499 }
3500
3501 // This is called _after_ the global arguments have been parsed.
3502 jint os::init_2(void) {
3503
3504 os::Posix::init_2();
3505
3506 if (os::Aix::on_pase()) {
3507 trcVerbose("Running on PASE.");
3508 } else {
3509 trcVerbose("Running on AIX (not PASE).");
3510 }
3511
3512 trcVerbose("processor count: %d", os::_processor_count);
3513 trcVerbose("physical memory: %lu", Aix::_physical_memory);
3514
3515 // Initially build up the loaded dll map.
3516 LoadedLibraries::reload();
3517 if (Verbose) {
3518 trcVerbose("Loaded Libraries: ");
3519 LoadedLibraries::print(tty);
3520 }
3521
3522 const int page_size = Aix::page_size();
3523 const int map_size = page_size;
3524
3525 address map_address = (address) MAP_FAILED;
3526 const int prot = PROT_READ;
3527 const int flags = MAP_PRIVATE|MAP_ANONYMOUS;
3528
3529 // Use optimized addresses for the polling page,
3530 // e.g. map it to a special 32-bit address.
3531 if (OptimizePollingPageLocation) {
3532 // architecture-specific list of address wishes:
3533 address address_wishes[] = {
3534 // AIX: addresses lower than 0x30000000 don't seem to work on AIX.
3535 // PPC64: all address wishes are non-negative 32 bit values where
3536 // the lower 16 bits are all zero. we can load these addresses
3537 // with a single ppc_lis instruction.
3538 (address) 0x30000000, (address) 0x31000000,
3539 (address) 0x32000000, (address) 0x33000000,
3540 (address) 0x40000000, (address) 0x41000000,
3541 (address) 0x42000000, (address) 0x43000000,
3542 (address) 0x50000000, (address) 0x51000000,
3543 (address) 0x52000000, (address) 0x53000000,
3544 (address) 0x60000000, (address) 0x61000000,
3545 (address) 0x62000000, (address) 0x63000000
3546 };
3547 int address_wishes_length = sizeof(address_wishes)/sizeof(address);
3548
3549 // iterate over the list of address wishes:
3550 for (int i=0; i<address_wishes_length; i++) {
3551 // Try to map with current address wish.
3552 // AIX: AIX needs MAP_FIXED if we provide an address and mmap will
3553 // fail if the address is already mapped.
3554 map_address = (address) ::mmap(address_wishes[i] - (ssize_t)page_size,
3555 map_size, prot,
3556 flags | MAP_FIXED,
3557 -1, 0);
3558 trcVerbose("SafePoint Polling Page address: %p (wish) => %p",
3559 address_wishes[i], map_address + (ssize_t)page_size);
3560
3561 if (map_address + (ssize_t)page_size == address_wishes[i]) {
3562 // Map succeeded and map_address is at wished address, exit loop.
3563 break;
3564 }
3565
3566 if (map_address != (address) MAP_FAILED) {
3567 // Map succeeded, but polling_page is not at wished address, unmap and continue.
3568 ::munmap(map_address, map_size);
3569 map_address = (address) MAP_FAILED;
3570 }
3571 // Map failed, continue loop.
3572 }
3573 } // end OptimizePollingPageLocation
3574
3575 if (map_address == (address) MAP_FAILED) {
3576 map_address = (address) ::mmap(NULL, map_size, prot, flags, -1, 0);
3577 }
3578 guarantee(map_address != MAP_FAILED, "os::init_2: failed to allocate polling page");
3579 os::set_polling_page(map_address);
3580
3581 if (!UseMembar) {
3582 address mem_serialize_page = (address) ::mmap(NULL, Aix::page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
3583 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page");
3584 os::set_memory_serialize_page(mem_serialize_page);
3585
3586 trcVerbose("Memory Serialize Page address: %p - %p, size %IX (%IB)",
3587 mem_serialize_page, mem_serialize_page + Aix::page_size(),
3588 Aix::page_size(), Aix::page_size());
3589 }
3590
3591 // initialize suspend/resume support - must do this before signal_sets_init()
3592 if (SR_initialize() != 0) {
3593 perror("SR_initialize failed");
3594 return JNI_ERR;
3595 }
3596
3597 Aix::signal_sets_init();
3598 Aix::install_signal_handlers();
3599
3600 // Check and sets minimum stack sizes against command line options
3601 if (Posix::set_minimum_stack_sizes() == JNI_ERR) {
3602 return JNI_ERR;
3603 }
3604
3605 if (UseNUMA) {
3606 UseNUMA = false;
3607 warning("NUMA optimizations are not available on this OS.");
3608 }
3609
3610 if (MaxFDLimit) {
3611 // Set the number of file descriptors to max. print out error
3612 // if getrlimit/setrlimit fails but continue regardless.
3613 struct rlimit nbr_files;
3614 int status = getrlimit(RLIMIT_NOFILE, &nbr_files);
3615 if (status != 0) {
3616 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno));
3617 } else {
3618 nbr_files.rlim_cur = nbr_files.rlim_max;
3619 status = setrlimit(RLIMIT_NOFILE, &nbr_files);
3620 if (status != 0) {
3621 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno));
3622 }
3623 }
3624 }
3625
3626 if (PerfAllowAtExitRegistration) {
3627 // Only register atexit functions if PerfAllowAtExitRegistration is set.
3628 // At exit functions can be delayed until process exit time, which
3629 // can be problematic for embedded VM situations. Embedded VMs should
3630 // call DestroyJavaVM() to assure that VM resources are released.
3631
3632 // Note: perfMemory_exit_helper atexit function may be removed in
3633 // the future if the appropriate cleanup code can be added to the
3634 // VM_Exit VMOperation's doit method.
3635 if (atexit(perfMemory_exit_helper) != 0) {
3636 warning("os::init_2 atexit(perfMemory_exit_helper) failed");
3637 }
3638 }
3639
3640 return JNI_OK;
3641 }
3642
3643 // Mark the polling page as unreadable
3644 void os::make_polling_page_unreadable(void) {
3645 if (!guard_memory((char*)_polling_page, Aix::page_size())) {
3646 fatal("Could not disable polling page");
3647 }
3648 };
3649
3650 // Mark the polling page as readable
3651 void os::make_polling_page_readable(void) {
3652 // Changed according to os_linux.cpp.
3653 if (!checked_mprotect((char *)_polling_page, Aix::page_size(), PROT_READ)) {
3654 fatal("Could not enable polling page at " PTR_FORMAT, _polling_page);
3655 }
3656 };
3657
3658 int os::active_processor_count() {
3659 int online_cpus = ::sysconf(_SC_NPROCESSORS_ONLN);
3660 assert(online_cpus > 0 && online_cpus <= processor_count(), "sanity check");
3661 return online_cpus;
3662 }
3663
3664 void os::set_native_thread_name(const char *name) {
3665 // Not yet implemented.
3666 return;
3667 }
3668
3669 bool os::distribute_processes(uint length, uint* distribution) {
3670 // Not yet implemented.
3671 return false;
3672 }
3673
3674 bool os::bind_to_processor(uint processor_id) {
3675 // Not yet implemented.
3676 return false;
3677 }
3678
3679 void os::SuspendedThreadTask::internal_do_task() {
3680 if (do_suspend(_thread->osthread())) {
3681 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext());
3682 do_task(context);
3683 do_resume(_thread->osthread());
3684 }
3685 }
3686
3687 class PcFetcher : public os::SuspendedThreadTask {
3688 public:
3689 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {}
3690 ExtendedPC result();
3691 protected:
3692 void do_task(const os::SuspendedThreadTaskContext& context);
3693 private:
3694 ExtendedPC _epc;
3695 };
3696
3697 ExtendedPC PcFetcher::result() {
3698 guarantee(is_done(), "task is not done yet.");
3699 return _epc;
3700 }
3701
3702 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) {
3703 Thread* thread = context.thread();
3704 OSThread* osthread = thread->osthread();
3705 if (osthread->ucontext() != NULL) {
3706 _epc = os::Aix::ucontext_get_pc((const ucontext_t *) context.ucontext());
3707 } else {
3708 // NULL context is unexpected, double-check this is the VMThread.
3709 guarantee(thread->is_VM_thread(), "can only be called for VMThread");
3710 }
3711 }
3712
3713 // Suspends the target using the signal mechanism and then grabs the PC before
3714 // resuming the target. Used by the flat-profiler only
3715 ExtendedPC os::get_thread_pc(Thread* thread) {
3716 // Make sure that it is called by the watcher for the VMThread.
3717 assert(Thread::current()->is_Watcher_thread(), "Must be watcher");
3718 assert(thread->is_VM_thread(), "Can only be called for VMThread");
3719
3720 PcFetcher fetcher(thread);
3721 fetcher.run();
3722 return fetcher.result();
3723 }
3724
3725 ////////////////////////////////////////////////////////////////////////////////
3726 // debug support
3727
3728 bool os::find(address addr, outputStream* st) {
3729
3730 st->print(PTR_FORMAT ": ", addr);
3731
3732 loaded_module_t lm;
3733 if (LoadedLibraries::find_for_text_address(addr, &lm) != NULL ||
3734 LoadedLibraries::find_for_data_address(addr, &lm) != NULL) {
3735 st->print_cr("%s", lm.path);
3736 return true;
3737 }
3738
3739 return false;
3740 }
3741
3742 ////////////////////////////////////////////////////////////////////////////////
3743 // misc
3744
3745 // This does not do anything on Aix. This is basically a hook for being
3746 // able to use structured exception handling (thread-local exception filters)
3747 // on, e.g., Win32.
3748 void
3749 os::os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method,
3750 JavaCallArguments* args, Thread* thread) {
3751 f(value, method, args, thread);
3752 }
3753
3754 void os::print_statistics() {
3755 }
3756
3757 bool os::message_box(const char* title, const char* message) {
3758 int i;
3759 fdStream err(defaultStream::error_fd());
3760 for (i = 0; i < 78; i++) err.print_raw("=");
3761 err.cr();
3762 err.print_raw_cr(title);
3763 for (i = 0; i < 78; i++) err.print_raw("-");
3764 err.cr();
3765 err.print_raw_cr(message);
3766 for (i = 0; i < 78; i++) err.print_raw("=");
3767 err.cr();
3768
3769 char buf[16];
3770 // Prevent process from exiting upon "read error" without consuming all CPU
3771 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); }
3772
3773 return buf[0] == 'y' || buf[0] == 'Y';
3774 }
3775
3776 int os::stat(const char *path, struct stat *sbuf) {
3777 char pathbuf[MAX_PATH];
3778 if (strlen(path) > MAX_PATH - 1) {
3779 errno = ENAMETOOLONG;
3780 return -1;
3781 }
3782 os::native_path(strcpy(pathbuf, path));
3783 return ::stat(pathbuf, sbuf);
3784 }
3785
3786 // Is a (classpath) directory empty?
3787 bool os::dir_is_empty(const char* path) {
3788 DIR *dir = NULL;
3789 struct dirent *ptr;
3790
3791 dir = opendir(path);
3792 if (dir == NULL) return true;
3793
3794 /* Scan the directory */
3795 bool result = true;
3796 char buf[sizeof(struct dirent) + MAX_PATH];
3797 while (result && (ptr = ::readdir(dir)) != NULL) {
3798 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) {
3799 result = false;
3800 }
3801 }
3802 closedir(dir);
3803 return result;
3804 }
3805
3806 // This code originates from JDK's sysOpen and open64_w
3807 // from src/solaris/hpi/src/system_md.c
3808
3809 int os::open(const char *path, int oflag, int mode) {
3810
3811 if (strlen(path) > MAX_PATH - 1) {
3812 errno = ENAMETOOLONG;
3813 return -1;
3814 }
3815 int fd;
3816
3817 fd = ::open64(path, oflag, mode);
3818 if (fd == -1) return -1;
3819
3820 // If the open succeeded, the file might still be a directory.
3821 {
3822 struct stat64 buf64;
3823 int ret = ::fstat64(fd, &buf64);
3824 int st_mode = buf64.st_mode;
3825
3826 if (ret != -1) {
3827 if ((st_mode & S_IFMT) == S_IFDIR) {
3828 errno = EISDIR;
3829 ::close(fd);
3830 return -1;
3831 }
3832 } else {
3833 ::close(fd);
3834 return -1;
3835 }
3836 }
3837
3838 // All file descriptors that are opened in the JVM and not
3839 // specifically destined for a subprocess should have the
3840 // close-on-exec flag set. If we don't set it, then careless 3rd
3841 // party native code might fork and exec without closing all
3842 // appropriate file descriptors (e.g. as we do in closeDescriptors in
3843 // UNIXProcess.c), and this in turn might:
3844 //
3845 // - cause end-of-file to fail to be detected on some file
3846 // descriptors, resulting in mysterious hangs, or
3847 //
3848 // - might cause an fopen in the subprocess to fail on a system
3849 // suffering from bug 1085341.
3850 //
3851 // (Yes, the default setting of the close-on-exec flag is a Unix
3852 // design flaw.)
3853 //
3854 // See:
3855 // 1085341: 32-bit stdio routines should support file descriptors >255
3856 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed
3857 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9
3858 #ifdef FD_CLOEXEC
3859 {
3860 int flags = ::fcntl(fd, F_GETFD);
3861 if (flags != -1)
3862 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
3863 }
3864 #endif
3865
3866 return fd;
3867 }
3868
3869 // create binary file, rewriting existing file if required
3870 int os::create_binary_file(const char* path, bool rewrite_existing) {
3871 int oflags = O_WRONLY | O_CREAT;
3872 if (!rewrite_existing) {
3873 oflags |= O_EXCL;
3874 }
3875 return ::open64(path, oflags, S_IREAD | S_IWRITE);
3876 }
3877
3878 // return current position of file pointer
3879 jlong os::current_file_offset(int fd) {
3880 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR);
3881 }
3882
3883 // move file pointer to the specified offset
3884 jlong os::seek_to_file_offset(int fd, jlong offset) {
3885 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET);
3886 }
3887
3888 // This code originates from JDK's sysAvailable
3889 // from src/solaris/hpi/src/native_threads/src/sys_api_td.c
3890
3891 int os::available(int fd, jlong *bytes) {
3892 jlong cur, end;
3893 int mode;
3894 struct stat64 buf64;
3895
3896 if (::fstat64(fd, &buf64) >= 0) {
3897 mode = buf64.st_mode;
3898 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
3899 int n;
3900 if (::ioctl(fd, FIONREAD, &n) >= 0) {
3901 *bytes = n;
3902 return 1;
3903 }
3904 }
3905 }
3906 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) {
3907 return 0;
3908 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) {
3909 return 0;
3910 } else if (::lseek64(fd, cur, SEEK_SET) == -1) {
3911 return 0;
3912 }
3913 *bytes = end - cur;
3914 return 1;
3915 }
3916
3917 // Map a block of memory.
3918 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset,
3919 char *addr, size_t bytes, bool read_only,
3920 bool allow_exec) {
3921 int prot;
3922 int flags = MAP_PRIVATE;
3923
3924 if (read_only) {
3925 prot = PROT_READ;
3926 flags = MAP_SHARED;
3927 } else {
3928 prot = PROT_READ | PROT_WRITE;
3929 flags = MAP_PRIVATE;
3930 }
3931
3932 if (allow_exec) {
3933 prot |= PROT_EXEC;
3934 }
3935
3936 if (addr != NULL) {
3937 flags |= MAP_FIXED;
3938 }
3939
3940 // Allow anonymous mappings if 'fd' is -1.
3941 if (fd == -1) {
3942 flags |= MAP_ANONYMOUS;
3943 }
3944
3945 char* mapped_address = (char*)::mmap(addr, (size_t)bytes, prot, flags,
3946 fd, file_offset);
3947 if (mapped_address == MAP_FAILED) {
3948 return NULL;
3949 }
3950 return mapped_address;
3951 }
3952
3953 // Remap a block of memory.
3954 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset,
3955 char *addr, size_t bytes, bool read_only,
3956 bool allow_exec) {
3957 // same as map_memory() on this OS
3958 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only,
3959 allow_exec);
3960 }
3961
3962 // Unmap a block of memory.
3963 bool os::pd_unmap_memory(char* addr, size_t bytes) {
3964 return munmap(addr, bytes) == 0;
3965 }
3966
3967 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool)
3968 // are used by JVM M&M and JVMTI to get user+sys or user CPU time
3969 // of a thread.
3970 //
3971 // current_thread_cpu_time() and thread_cpu_time(Thread*) returns
3972 // the fast estimate available on the platform.
3973
3974 jlong os::current_thread_cpu_time() {
3975 // return user + sys since the cost is the same
3976 const jlong n = os::thread_cpu_time(Thread::current(), true /* user + sys */);
3977 assert(n >= 0, "negative CPU time");
3978 return n;
3979 }
3980
3981 jlong os::thread_cpu_time(Thread* thread) {
3982 // consistent with what current_thread_cpu_time() returns
3983 const jlong n = os::thread_cpu_time(thread, true /* user + sys */);
3984 assert(n >= 0, "negative CPU time");
3985 return n;
3986 }
3987
3988 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) {
3989 const jlong n = os::thread_cpu_time(Thread::current(), user_sys_cpu_time);
3990 assert(n >= 0, "negative CPU time");
3991 return n;
3992 }
3993
3994 static bool thread_cpu_time_unchecked(Thread* thread, jlong* p_sys_time, jlong* p_user_time) {
3995 bool error = false;
3996
3997 jlong sys_time = 0;
3998 jlong user_time = 0;
3999
4000 // Reimplemented using getthrds64().
4001 //
4002 // Works like this:
4003 // For the thread in question, get the kernel thread id. Then get the
4004 // kernel thread statistics using that id.
4005 //
4006 // This only works of course when no pthread scheduling is used,
4007 // i.e. there is a 1:1 relationship to kernel threads.
4008 // On AIX, see AIXTHREAD_SCOPE variable.
4009
4010 pthread_t pthtid = thread->osthread()->pthread_id();
4011
4012 // retrieve kernel thread id for the pthread:
4013 tid64_t tid = 0;
4014 struct __pthrdsinfo pinfo;
4015 // I just love those otherworldly IBM APIs which force me to hand down
4016 // dummy buffers for stuff I dont care for...
4017 char dummy[1];
4018 int dummy_size = sizeof(dummy);
4019 if (pthread_getthrds_np(&pthtid, PTHRDSINFO_QUERY_TID, &pinfo, sizeof(pinfo),
4020 dummy, &dummy_size) == 0) {
4021 tid = pinfo.__pi_tid;
4022 } else {
4023 tty->print_cr("pthread_getthrds_np failed.");
4024 error = true;
4025 }
4026
4027 // retrieve kernel timing info for that kernel thread
4028 if (!error) {
4029 struct thrdentry64 thrdentry;
4030 if (getthrds64(getpid(), &thrdentry, sizeof(thrdentry), &tid, 1) == 1) {
4031 sys_time = thrdentry.ti_ru.ru_stime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_stime.tv_usec * 1000LL;
4032 user_time = thrdentry.ti_ru.ru_utime.tv_sec * 1000000000LL + thrdentry.ti_ru.ru_utime.tv_usec * 1000LL;
4033 } else {
4034 tty->print_cr("pthread_getthrds_np failed.");
4035 error = true;
4036 }
4037 }
4038
4039 if (p_sys_time) {
4040 *p_sys_time = sys_time;
4041 }
4042
4043 if (p_user_time) {
4044 *p_user_time = user_time;
4045 }
4046
4047 if (error) {
4048 return false;
4049 }
4050
4051 return true;
4052 }
4053
4054 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) {
4055 jlong sys_time;
4056 jlong user_time;
4057
4058 if (!thread_cpu_time_unchecked(thread, &sys_time, &user_time)) {
4059 return -1;
4060 }
4061
4062 return user_sys_cpu_time ? sys_time + user_time : user_time;
4063 }
4064
4065 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4066 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4067 info_ptr->may_skip_backward = false; // elapsed time not wall time
4068 info_ptr->may_skip_forward = false; // elapsed time not wall time
4069 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4070 }
4071
4072 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) {
4073 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits
4074 info_ptr->may_skip_backward = false; // elapsed time not wall time
4075 info_ptr->may_skip_forward = false; // elapsed time not wall time
4076 info_ptr->kind = JVMTI_TIMER_TOTAL_CPU; // user+system time is returned
4077 }
4078
4079 bool os::is_thread_cpu_time_supported() {
4080 return true;
4081 }
4082
4083 // System loadavg support. Returns -1 if load average cannot be obtained.
4084 // For now just return the system wide load average (no processor sets).
4085 int os::loadavg(double values[], int nelem) {
4086
4087 guarantee(nelem >= 0 && nelem <= 3, "argument error");
4088 guarantee(values, "argument error");
4089
4090 if (os::Aix::on_pase()) {
4091
4092 // AS/400 PASE: use libo4 porting library
4093 double v[3] = { 0.0, 0.0, 0.0 };
4094
4095 if (libo4::get_load_avg(v, v + 1, v + 2)) {
4096 for (int i = 0; i < nelem; i ++) {
4097 values[i] = v[i];
4098 }
4099 return nelem;
4100 } else {
4101 return -1;
4102 }
4103
4104 } else {
4105
4106 // AIX: use libperfstat
4107 libperfstat::cpuinfo_t ci;
4108 if (libperfstat::get_cpuinfo(&ci)) {
4109 for (int i = 0; i < nelem; i++) {
4110 values[i] = ci.loadavg[i];
4111 }
4112 } else {
4113 return -1;
4114 }
4115 return nelem;
4116 }
4117 }
4118
4119 void os::pause() {
4120 char filename[MAX_PATH];
4121 if (PauseAtStartupFile && PauseAtStartupFile[0]) {
4122 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile);
4123 } else {
4124 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id());
4125 }
4126
4127 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
4128 if (fd != -1) {
4129 struct stat buf;
4130 ::close(fd);
4131 while (::stat(filename, &buf) == 0) {
4132 (void)::poll(NULL, 0, 100);
4133 }
4134 } else {
4135 trcVerbose("Could not open pause file '%s', continuing immediately.", filename);
4136 }
4137 }
4138
4139 bool os::Aix::is_primordial_thread() {
4140 if (pthread_self() == (pthread_t)1) {
4141 return true;
4142 } else {
4143 return false;
4144 }
4145 }
4146
4147 // OS recognitions (PASE/AIX, OS level) call this before calling any
4148 // one of Aix::on_pase(), Aix::os_version() static
4149 void os::Aix::initialize_os_info() {
4150
4151 assert(_on_pase == -1 && _os_version == 0, "already called.");
4152
4153 struct utsname uts;
4154 memset(&uts, 0, sizeof(uts));
4155 strcpy(uts.sysname, "?");
4156 if (::uname(&uts) == -1) {
4157 trcVerbose("uname failed (%d)", errno);
4158 guarantee(0, "Could not determine whether we run on AIX or PASE");
4159 } else {
4160 trcVerbose("uname says: sysname \"%s\" version \"%s\" release \"%s\" "
4161 "node \"%s\" machine \"%s\"\n",
4162 uts.sysname, uts.version, uts.release, uts.nodename, uts.machine);
4163 const int major = atoi(uts.version);
4164 assert(major > 0, "invalid OS version");
4165 const int minor = atoi(uts.release);
4166 assert(minor > 0, "invalid OS release");
4167 _os_version = (major << 24) | (minor << 16);
4168 char ver_str[20] = {0};
4169 char *name_str = "unknown OS";
4170 if (strcmp(uts.sysname, "OS400") == 0) {
4171 // We run on AS/400 PASE. We do not support versions older than V5R4M0.
4172 _on_pase = 1;
4173 if (os_version_short() < 0x0504) {
4174 trcVerbose("OS/400 releases older than V5R4M0 not supported.");
4175 assert(false, "OS/400 release too old.");
4176 }
4177 name_str = "OS/400 (pase)";
4178 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u", major, minor);
4179 } else if (strcmp(uts.sysname, "AIX") == 0) {
4180 // We run on AIX. We do not support versions older than AIX 5.3.
4181 _on_pase = 0;
4182 // Determine detailed AIX version: Version, Release, Modification, Fix Level.
4183 odmWrapper::determine_os_kernel_version(&_os_version);
4184 if (os_version_short() < 0x0503) {
4185 trcVerbose("AIX release older than AIX 5.3 not supported.");
4186 assert(false, "AIX release too old.");
4187 }
4188 name_str = "AIX";
4189 jio_snprintf(ver_str, sizeof(ver_str), "%u.%u.%u.%u",
4190 major, minor, (_os_version >> 8) & 0xFF, _os_version & 0xFF);
4191 } else {
4192 assert(false, name_str);
4193 }
4194 trcVerbose("We run on %s %s", name_str, ver_str);
4195 }
4196
4197 guarantee(_on_pase != -1 && _os_version, "Could not determine AIX/OS400 release");
4198 } // end: os::Aix::initialize_os_info()
4199
4200 // Scan environment for important settings which might effect the VM.
4201 // Trace out settings. Warn about invalid settings and/or correct them.
4202 //
4203 // Must run after os::Aix::initialue_os_info().
4204 void os::Aix::scan_environment() {
4205
4206 char* p;
4207 int rc;
4208
4209 // Warn explicity if EXTSHM=ON is used. That switch changes how
4210 // System V shared memory behaves. One effect is that page size of
4211 // shared memory cannot be change dynamically, effectivly preventing
4212 // large pages from working.
4213 // This switch was needed on AIX 32bit, but on AIX 64bit the general
4214 // recommendation is (in OSS notes) to switch it off.
4215 p = ::getenv("EXTSHM");
4216 trcVerbose("EXTSHM=%s.", p ? p : "<unset>");
4217 if (p && strcasecmp(p, "ON") == 0) {
4218 _extshm = 1;
4219 trcVerbose("*** Unsupported mode! Please remove EXTSHM from your environment! ***");
4220 if (!AllowExtshm) {
4221 // We allow under certain conditions the user to continue. However, we want this
4222 // to be a fatal error by default. On certain AIX systems, leaving EXTSHM=ON means
4223 // that the VM is not able to allocate 64k pages for the heap.
4224 // We do not want to run with reduced performance.
4225 vm_exit_during_initialization("EXTSHM is ON. Please remove EXTSHM from your environment.");
4226 }
4227 } else {
4228 _extshm = 0;
4229 }
4230
4231 // SPEC1170 behaviour: will change the behaviour of a number of POSIX APIs.
4232 // Not tested, not supported.
4233 //
4234 // Note that it might be worth the trouble to test and to require it, if only to
4235 // get useful return codes for mprotect.
4236 //
4237 // Note: Setting XPG_SUS_ENV in the process is too late. Must be set earlier (before
4238 // exec() ? before loading the libjvm ? ....)
4239 p = ::getenv("XPG_SUS_ENV");
4240 trcVerbose("XPG_SUS_ENV=%s.", p ? p : "<unset>");
4241 if (p && strcmp(p, "ON") == 0) {
4242 _xpg_sus_mode = 1;
4243 trcVerbose("Unsupported setting: XPG_SUS_ENV=ON");
4244 // This is not supported. Worst of all, it changes behaviour of mmap MAP_FIXED to
4245 // clobber address ranges. If we ever want to support that, we have to do some
4246 // testing first.
4247 guarantee(false, "XPG_SUS_ENV=ON not supported");
4248 } else {
4249 _xpg_sus_mode = 0;
4250 }
4251
4252 if (os::Aix::on_pase()) {
4253 p = ::getenv("QIBM_MULTI_THREADED");
4254 trcVerbose("QIBM_MULTI_THREADED=%s.", p ? p : "<unset>");
4255 }
4256
4257 p = ::getenv("LDR_CNTRL");
4258 trcVerbose("LDR_CNTRL=%s.", p ? p : "<unset>");
4259 if (os::Aix::on_pase() && os::Aix::os_version_short() == 0x0701) {
4260 if (p && ::strstr(p, "TEXTPSIZE")) {
4261 trcVerbose("*** WARNING - LDR_CNTRL contains TEXTPSIZE. "
4262 "you may experience hangs or crashes on OS/400 V7R1.");
4263 }
4264 }
4265
4266 p = ::getenv("AIXTHREAD_GUARDPAGES");
4267 trcVerbose("AIXTHREAD_GUARDPAGES=%s.", p ? p : "<unset>");
4268
4269 } // end: os::Aix::scan_environment()
4270
4271 // PASE: initialize the libo4 library (PASE porting library).
4272 void os::Aix::initialize_libo4() {
4273 guarantee(os::Aix::on_pase(), "OS/400 only.");
4274 if (!libo4::init()) {
4275 trcVerbose("libo4 initialization failed.");
4276 assert(false, "libo4 initialization failed");
4277 } else {
4278 trcVerbose("libo4 initialized.");
4279 }
4280 }
4281
4282 // AIX: initialize the libperfstat library.
4283 void os::Aix::initialize_libperfstat() {
4284 assert(os::Aix::on_aix(), "AIX only");
4285 if (!libperfstat::init()) {
4286 trcVerbose("libperfstat initialization failed.");
4287 assert(false, "libperfstat initialization failed");
4288 } else {
4289 trcVerbose("libperfstat initialized.");
4290 }
4291 }
4292
4293 /////////////////////////////////////////////////////////////////////////////
4294 // thread stack
4295
4296 // Get the current stack base from the OS (actually, the pthread library).
4297 // Note: usually not page aligned.
4298 address os::current_stack_base() {
4299 AixMisc::stackbounds_t bounds;
4300 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4301 guarantee(rc, "Unable to retrieve stack bounds.");
4302 return bounds.base;
4303 }
4304
4305 // Get the current stack size from the OS (actually, the pthread library).
4306 // Returned size is such that (base - size) is always aligned to page size.
4307 size_t os::current_stack_size() {
4308 AixMisc::stackbounds_t bounds;
4309 bool rc = AixMisc::query_stack_bounds_for_current_thread(&bounds);
4310 guarantee(rc, "Unable to retrieve stack bounds.");
4311 // Align the returned stack size such that the stack low address
4312 // is aligned to page size (Note: base is usually not and we do not care).
4313 // We need to do this because caller code will assume stack low address is
4314 // page aligned and will place guard pages without checking.
4315 address low = bounds.base - bounds.size;
4316 address low_aligned = (address)align_up(low, os::vm_page_size());
4317 size_t s = bounds.base - low_aligned;
4318 return s;
4319 }
4320
4321 extern char** environ;
4322
4323 // Run the specified command in a separate process. Return its exit value,
4324 // or -1 on failure (e.g. can't fork a new process).
4325 // Unlike system(), this function can be called from signal handler. It
4326 // doesn't block SIGINT et al.
4327 int os::fork_and_exec(char* cmd) {
4328 char * argv[4] = {"sh", "-c", cmd, NULL};
4329
4330 pid_t pid = fork();
4331
4332 if (pid < 0) {
4333 // fork failed
4334 return -1;
4335
4336 } else if (pid == 0) {
4337 // child process
4338
4339 // Try to be consistent with system(), which uses "/usr/bin/sh" on AIX.
4340 execve("/usr/bin/sh", argv, environ);
4341
4342 // execve failed
4343 _exit(-1);
4344
4345 } else {
4346 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't
4347 // care about the actual exit code, for now.
4348
4349 int status;
4350
4351 // Wait for the child process to exit. This returns immediately if
4352 // the child has already exited. */
4353 while (waitpid(pid, &status, 0) < 0) {
4354 switch (errno) {
4355 case ECHILD: return 0;
4356 case EINTR: break;
4357 default: return -1;
4358 }
4359 }
4360
4361 if (WIFEXITED(status)) {
4362 // The child exited normally; get its exit code.
4363 return WEXITSTATUS(status);
4364 } else if (WIFSIGNALED(status)) {
4365 // The child exited because of a signal.
4366 // The best value to return is 0x80 + signal number,
4367 // because that is what all Unix shells do, and because
4368 // it allows callers to distinguish between process exit and
4369 // process death by signal.
4370 return 0x80 + WTERMSIG(status);
4371 } else {
4372 // Unknown exit code; pass it through.
4373 return status;
4374 }
4375 }
4376 return -1;
4377 }
4378
4379 // is_headless_jre()
4380 //
4381 // Test for the existence of xawt/libmawt.so or libawt_xawt.so
4382 // in order to report if we are running in a headless jre.
4383 //
4384 // Since JDK8 xawt/libmawt.so is moved into the same directory
4385 // as libawt.so, and renamed libawt_xawt.so
4386 bool os::is_headless_jre() {
4387 struct stat statbuf;
4388 char buf[MAXPATHLEN];
4389 char libmawtpath[MAXPATHLEN];
4390 const char *xawtstr = "/xawt/libmawt.so";
4391 const char *new_xawtstr = "/libawt_xawt.so";
4392
4393 char *p;
4394
4395 // Get path to libjvm.so
4396 os::jvm_path(buf, sizeof(buf));
4397
4398 // Get rid of libjvm.so
4399 p = strrchr(buf, '/');
4400 if (p == NULL) return false;
4401 else *p = '\0';
4402
4403 // Get rid of client or server
4404 p = strrchr(buf, '/');
4405 if (p == NULL) return false;
4406 else *p = '\0';
4407
4408 // check xawt/libmawt.so
4409 strcpy(libmawtpath, buf);
4410 strcat(libmawtpath, xawtstr);
4411 if (::stat(libmawtpath, &statbuf) == 0) return false;
4412
4413 // check libawt_xawt.so
4414 strcpy(libmawtpath, buf);
4415 strcat(libmawtpath, new_xawtstr);
4416 if (::stat(libmawtpath, &statbuf) == 0) return false;
4417
4418 return true;
4419 }
4420
4421 // Get the default path to the core file
4422 // Returns the length of the string
4423 int os::get_core_path(char* buffer, size_t bufferSize) {
4424 const char* p = get_current_directory(buffer, bufferSize);
4425
4426 if (p == NULL) {
4427 assert(p != NULL, "failed to get current directory");
4428 return 0;
4429 }
4430
4431 jio_snprintf(buffer, bufferSize, "%s/core or core.%d",
4432 p, current_process_id());
4433
4434 return strlen(buffer);
4435 }
4436
4437 #ifndef PRODUCT
4438 void TestReserveMemorySpecial_test() {
4439 // No tests available for this platform
4440 }
4441 #endif
4442
4443 bool os::start_debugging(char *buf, int buflen) {
4444 int len = (int)strlen(buf);
4445 char *p = &buf[len];
4446
4447 jio_snprintf(p, buflen -len,
4448 "\n\n"
4449 "Do you want to debug the problem?\n\n"
4450 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n"
4451 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
4452 "Otherwise, press RETURN to abort...",
4453 os::current_process_id(),
4454 os::current_thread_id(), thread_self());
4455
4456 bool yes = os::message_box("Unexpected Error", buf);
4457
4458 if (yes) {
4459 // yes, user asked VM to launch debugger
4460 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id());
4461
4462 os::fork_and_exec(buf);
4463 yes = false;
4464 }
4465 return yes;
4466 }
4467
4468 static inline time_t get_mtime(const char* filename) {
4469 struct stat st;
4470 int ret = os::stat(filename, &st);
4471 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno));
4472 return st.st_mtime;
4473 }
4474
4475 int os::compare_file_modified_times(const char* file1, const char* file2) {
4476 time_t t1 = get_mtime(file1);
4477 time_t t2 = get_mtime(file2);
4478 return t1 - t2;
4479 }