1 /*
2 * Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // no precompiled headers
26 #include "assembler_arm.inline.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/icBuffer.hpp"
31 #include "code/vtableStubs.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "jvm_linux.h"
34 #include "memory/allocation.inline.hpp"
35 #include "nativeInst_arm.hpp"
36 #include "os_share_linux.hpp"
37 #include "prims/jniFastGetField.hpp"
38 #include "prims/jvm.h"
39 #include "prims/jvm_misc.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/extendedPC.hpp"
42 #include "runtime/frame.inline.hpp"
43 #include "runtime/interfaceSupport.hpp"
44 #include "runtime/java.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/mutexLocker.hpp"
47 #include "runtime/osThread.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "runtime/timer.hpp"
51 #include "utilities/events.hpp"
52 #include "utilities/vmError.hpp"
53
54 // put OS-includes here
55 # include <sys/types.h>
56 # include <sys/mman.h>
57 # include <pthread.h>
58 # include <signal.h>
59 # include <errno.h>
60 # include <dlfcn.h>
61 # include <stdlib.h>
62 # include <stdio.h>
63 # include <unistd.h>
64 # include <sys/resource.h>
65 # include <pthread.h>
66 # include <sys/stat.h>
67 # include <sys/time.h>
68 # include <sys/utsname.h>
69 # include <sys/socket.h>
70 # include <sys/wait.h>
71 # include <pwd.h>
72 # include <poll.h>
73 # include <ucontext.h>
74 # include <fpu_control.h>
75 # include <asm/ptrace.h>
76
77 #define SPELL_REG_SP "sp"
78
79 // Don't #define SPELL_REG_FP for thumb because it is not safe to use, so this makes sure we never fetch it.
80 #ifndef __thumb__
81 #define SPELL_REG_FP AARCH64_ONLY("x29") NOT_AARCH64("fp")
82 #endif
83
84 address os::current_stack_pointer() {
85 register address sp __asm__ (SPELL_REG_SP);
86 return sp;
87 }
88
89 char* os::non_memory_address_word() {
90 // Must never look like an address returned by reserve_memory
91 return (char*) -1;
92 }
93
94 void os::initialize_thread(Thread* thr) {
95 // Nothing to do
96 }
97
98 #ifdef AARCH64
99
100 #define arm_pc pc
101 #define arm_sp sp
102 #define arm_fp regs[29]
103 #define arm_r0 regs[0]
104 #define ARM_REGS_IN_CONTEXT 31
105
106 #else
107
108 #if NGREG == 16
109 // These definitions are based on the observation that until
110 // the certain version of GCC mcontext_t was defined as
111 // a structure containing gregs[NGREG] array with 16 elements.
112 // In later GCC versions mcontext_t was redefined as struct sigcontext,
113 // along with NGREG constant changed to 18.
114 #define arm_pc gregs[15]
115 #define arm_sp gregs[13]
116 #define arm_fp gregs[11]
117 #define arm_r0 gregs[0]
118 #endif
119
120 #define ARM_REGS_IN_CONTEXT 16
121
122 #endif // AARCH64
123
124 address os::Linux::ucontext_get_pc(const ucontext_t* uc) {
125 return (address)uc->uc_mcontext.arm_pc;
126 }
127
128 void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) {
129 uc->uc_mcontext.arm_pc = (uintx)pc;
130 }
131
132 intptr_t* os::Linux::ucontext_get_sp(const ucontext_t* uc) {
133 return (intptr_t*)uc->uc_mcontext.arm_sp;
134 }
135
136 intptr_t* os::Linux::ucontext_get_fp(const ucontext_t* uc) {
137 return (intptr_t*)uc->uc_mcontext.arm_fp;
138 }
139
140 bool is_safe_for_fp(address pc) {
141 #ifdef __thumb__
142 if (CodeCache::find_blob(pc) != NULL) {
143 return true;
144 }
145 // For thumb C frames, given an fp we have no idea how to access the frame contents.
146 return false;
147 #else
148 // Calling os::address_is_in_vm() here leads to a dladdr call. Calling any libc
149 // function during os::get_native_stack() can result in a deadlock if JFR is
150 // enabled. For now, be more lenient and allow all pc's. There are other
151 // frame sanity checks in shared code, and to date they have been sufficient
152 // for other platforms.
153 //return os::address_is_in_vm(pc);
154 return true;
155 #endif
156 }
157
158 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
159 // is currently interrupted by SIGPROF.
160 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal
161 // frames. Currently we don't do that on Linux, so it's the same as
162 // os::fetch_frame_from_context().
163 ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread,
164 const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
165
166 assert(thread != NULL, "just checking");
167 assert(ret_sp != NULL, "just checking");
168 assert(ret_fp != NULL, "just checking");
169
170 return os::fetch_frame_from_context(uc, ret_sp, ret_fp);
171 }
172
173 ExtendedPC os::fetch_frame_from_context(const void* ucVoid,
174 intptr_t** ret_sp, intptr_t** ret_fp) {
175
176 ExtendedPC epc;
177 const ucontext_t* uc = (const ucontext_t*)ucVoid;
178
179 if (uc != NULL) {
180 epc = ExtendedPC(os::Linux::ucontext_get_pc(uc));
181 if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
182 if (ret_fp) {
183 intptr_t* fp = os::Linux::ucontext_get_fp(uc);
184 #ifndef __thumb__
185 if (CodeCache::find_blob(epc.pc()) == NULL) {
186 // It's a C frame. We need to adjust the fp.
187 fp += os::C_frame_offset;
188 }
189 #endif
190 // Clear FP when stack walking is dangerous so that
191 // the frame created will not be walked.
192 // However, ensure FP is set correctly when reliable and
193 // potentially necessary.
194 if (!is_safe_for_fp(epc.pc())) {
195 // FP unreliable
196 fp = (intptr_t *)NULL;
197 }
198 *ret_fp = fp;
199 }
200 } else {
201 // construct empty ExtendedPC for return value checking
202 epc = ExtendedPC(NULL);
203 if (ret_sp) *ret_sp = (intptr_t *)NULL;
204 if (ret_fp) *ret_fp = (intptr_t *)NULL;
205 }
206
207 return epc;
208 }
209
210 frame os::fetch_frame_from_context(const void* ucVoid) {
211 intptr_t* sp;
212 intptr_t* fp;
213 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
214 return frame(sp, fp, epc.pc());
215 }
216
217 frame os::get_sender_for_C_frame(frame* fr) {
218 #ifdef __thumb__
219 // We can't reliably get anything from a thumb C frame.
220 return frame();
221 #else
222 address pc = fr->sender_pc();
223 if (! is_safe_for_fp(pc)) {
224 return frame(fr->sender_sp(), (intptr_t *)NULL, pc);
225 } else {
226 return frame(fr->sender_sp(), fr->link() + os::C_frame_offset, pc);
227 }
228 #endif
229 }
230
231 //
232 // This actually returns two frames up. It does not return os::current_frame(),
233 // which is the actual current frame. Nor does it return os::get_native_stack(),
234 // which is the caller. It returns whoever called os::get_native_stack(). Not
235 // very intuitive, but consistent with how this API is implemented on other
236 // platforms.
237 //
238 frame os::current_frame() {
239 #ifdef __thumb__
240 // We can't reliably get anything from a thumb C frame.
241 return frame();
242 #else
243 register intptr_t* fp __asm__ (SPELL_REG_FP);
244 // fp is for os::current_frame. We want the fp for our caller.
245 frame myframe((intptr_t*)os::current_stack_pointer(), fp + os::C_frame_offset,
246 CAST_FROM_FN_PTR(address, os::current_frame));
247 frame caller_frame = os::get_sender_for_C_frame(&myframe);
248
249 if (os::is_first_C_frame(&caller_frame)) {
250 // stack is not walkable
251 // Assert below was added because it does not seem like this can ever happen.
252 // How can this frame ever be the first C frame since it is called from C code?
253 // If it does ever happen, undo the assert and comment here on when/why it happens.
254 assert(false, "this should never happen");
255 return frame();
256 }
257
258 // return frame for our caller's caller
259 return os::get_sender_for_C_frame(&caller_frame);
260 #endif
261 }
262
263 #ifndef AARCH64
264 extern "C" address check_vfp_fault_instr;
265 extern "C" address check_vfp3_32_fault_instr;
266
267 address check_vfp_fault_instr = NULL;
268 address check_vfp3_32_fault_instr = NULL;
269 #endif // !AARCH64
270 extern "C" address check_simd_fault_instr;
271 address check_simd_fault_instr = NULL;
272
273 // Utility functions
274
275 extern "C" int JVM_handle_linux_signal(int sig, siginfo_t* info,
276 void* ucVoid, int abort_if_unrecognized) {
277 ucontext_t* uc = (ucontext_t*) ucVoid;
278
279 Thread* t = Thread::current_or_null_safe();
280
281 // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away
282 // (no destructors can be run)
283 os::WatcherThreadCrashProtection::check_crash_protection(sig, t);
284
285 SignalHandlerMark shm(t);
286
287 if (sig == SIGILL &&
288 ((info->si_addr == (caddr_t)check_simd_fault_instr)
289 NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp_fault_instr)
290 NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp3_32_fault_instr))) {
291 // skip faulty instruction + instruction that sets return value to
292 // success and set return value to failure.
293 os::Linux::ucontext_set_pc(uc, (address)info->si_addr + 8);
294 uc->uc_mcontext.arm_r0 = 0;
295 return true;
296 }
297
298 // Note: it's not uncommon that JNI code uses signal/sigset to install
299 // then restore certain signal handler (e.g. to temporarily block SIGPIPE,
300 // or have a SIGILL handler when detecting CPU type). When that happens,
301 // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To
302 // avoid unnecessary crash when libjsig is not preloaded, try handle signals
303 // that do not require siginfo/ucontext first.
304
305 if (sig == SIGPIPE || sig == SIGXFSZ) {
306 // allow chained handler to go first
307 if (os::Linux::chained_handler(sig, info, ucVoid)) {
308 return true;
309 } else {
310 // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219
311 return true;
312 }
313 }
314
315 JavaThread* thread = NULL;
316 VMThread* vmthread = NULL;
317 if (os::Linux::signal_handlers_are_installed) {
318 if (t != NULL ){
319 if(t->is_Java_thread()) {
320 thread = (JavaThread*)t;
321 }
322 else if(t->is_VM_thread()){
323 vmthread = (VMThread *)t;
324 }
325 }
326 }
327
328 address stub = NULL;
329 address pc = NULL;
330 bool unsafe_access = false;
331
332 if (info != NULL && uc != NULL && thread != NULL) {
333 pc = (address) os::Linux::ucontext_get_pc(uc);
334
335 // Handle ALL stack overflow variations here
336 if (sig == SIGSEGV) {
337 address addr = (address) info->si_addr;
338
339 if (StubRoutines::is_safefetch_fault(pc)) {
340 os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
341 return 1;
342 }
343 // check if fault address is within thread stack
344 if (addr < thread->stack_base() &&
345 addr >= thread->stack_base() - thread->stack_size()) {
346 // stack overflow
347 if (thread->in_stack_yellow_reserved_zone(addr)) {
348 thread->disable_stack_yellow_reserved_zone();
349 if (thread->thread_state() == _thread_in_Java) {
350 // Throw a stack overflow exception. Guard pages will be reenabled
351 // while unwinding the stack.
352 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
353 } else {
354 // Thread was in the vm or native code. Return and try to finish.
355 return 1;
356 }
357 } else if (thread->in_stack_red_zone(addr)) {
358 // Fatal red zone violation. Disable the guard pages and fall through
359 // to handle_unexpected_exception way down below.
360 thread->disable_stack_red_zone();
361 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
362 } else {
363 // Accessing stack address below sp may cause SEGV if current
364 // thread has MAP_GROWSDOWN stack. This should only happen when
365 // current thread was created by user code with MAP_GROWSDOWN flag
366 // and then attached to VM. See notes in os_linux.cpp.
367 if (thread->osthread()->expanding_stack() == 0) {
368 thread->osthread()->set_expanding_stack();
369 if (os::Linux::manually_expand_stack(thread, addr)) {
370 thread->osthread()->clear_expanding_stack();
371 return 1;
372 }
373 thread->osthread()->clear_expanding_stack();
374 } else {
375 fatal("recursive segv. expanding stack.");
376 }
377 }
378 }
379 }
380
381 if (thread->thread_state() == _thread_in_Java) {
382 // Java thread running in Java code => find exception handler if any
383 // a fault inside compiled code, the interpreter, or a stub
384
385 if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
386 stub = SharedRuntime::get_poll_stub(pc);
387 } else if (sig == SIGBUS) {
388 // BugId 4454115: A read from a MappedByteBuffer can fault
389 // here if the underlying file has been truncated.
390 // Do not crash the VM in such a case.
391 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
392 CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
393 if (nm != NULL && nm->has_unsafe_access()) {
394 unsafe_access = true;
395 }
396 } else if (sig == SIGSEGV && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
397 // Determination of interpreter/vtable stub/compiled code null exception
398 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
399 if (cb != NULL) {
400 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
401 }
402 } else if (sig == SIGILL && *(int *)pc == NativeInstruction::zombie_illegal_instruction) {
403 // Zombie
404 stub = SharedRuntime::get_handle_wrong_method_stub();
405 }
406 } else if (thread->thread_state() == _thread_in_vm &&
407 sig == SIGBUS && thread->doing_unsafe_access()) {
408 unsafe_access = true;
409 }
410
411 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
412 // and the heap gets shrunk before the field access.
413 if (sig == SIGSEGV || sig == SIGBUS) {
414 address addr = JNI_FastGetField::find_slowcase_pc(pc);
415 if (addr != (address)-1) {
416 stub = addr;
417 }
418 }
419
420 // Check to see if we caught the safepoint code in the
421 // process of write protecting the memory serialization page.
422 // It write enables the page immediately after protecting it
423 // so we can just return to retry the write.
424 if (sig == SIGSEGV && os::is_memory_serialize_page(thread, (address) info->si_addr)) {
425 // Block current thread until the memory serialize page permission restored.
426 os::block_on_serialize_page_trap();
427 return true;
428 }
429 }
430
431 if (unsafe_access && stub == NULL) {
432 // it can be an unsafe access and we haven't found
433 // any other suitable exception reason,
434 // so assume it is an unsafe access.
435 address next_pc = pc + Assembler::InstructionSize;
436 #ifdef __thumb__
437 if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) {
438 next_pc = (address)((intptr_t)next_pc | 0x1);
439 }
440 #endif
441
442 stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
443 }
444
445 if (stub != NULL) {
446 #ifdef __thumb__
447 if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) {
448 intptr_t p = (intptr_t)pc | 0x1;
449 pc = (address)p;
450
451 // Clear Thumb mode bit if we're redirected into the ARM ISA based code
452 if (((intptr_t)stub & 0x1) == 0) {
453 uc->uc_mcontext.arm_cpsr &= ~PSR_T_BIT;
454 }
455 } else {
456 // No Thumb2 compiled stubs are triggered from ARM ISA compiled JIT'd code today.
457 // The support needs to be added if that changes
458 assert((((intptr_t)stub & 0x1) == 0), "can't return to Thumb code");
459 }
460 #endif
461
462 // save all thread context in case we need to restore it
463 if (thread != NULL) thread->set_saved_exception_pc(pc);
464
465 os::Linux::ucontext_set_pc(uc, stub);
466 return true;
467 }
468
469 // signal-chaining
470 if (os::Linux::chained_handler(sig, info, ucVoid)) {
471 return true;
472 }
473
474 if (!abort_if_unrecognized) {
475 // caller wants another chance, so give it to him
476 return false;
477 }
478
479 if (pc == NULL && uc != NULL) {
480 pc = os::Linux::ucontext_get_pc(uc);
481 }
482
483 // unmask current signal
484 sigset_t newset;
485 sigemptyset(&newset);
486 sigaddset(&newset, sig);
487 sigprocmask(SIG_UNBLOCK, &newset, NULL);
488
489 VMError::report_and_die(t, sig, pc, info, ucVoid);
490
491 ShouldNotReachHere();
492 return false;
493 }
494
495 void os::Linux::init_thread_fpu_state(void) {
496 os::setup_fpu();
497 }
498
499 int os::Linux::get_fpu_control_word(void) {
500 return 0;
501 }
502
503 void os::Linux::set_fpu_control_word(int fpu_control) {
504 // Nothing to do
505 }
506
507 void os::setup_fpu() {
508 #ifdef AARCH64
509 __asm__ volatile ("msr fpcr, xzr");
510 #else
511 #if !defined(__SOFTFP__) && defined(__VFP_FP__)
512 // Turn on IEEE-754 compliant VFP mode
513 __asm__ volatile (
514 "mov %%r0, #0;"
515 "fmxr fpscr, %%r0"
516 : /* no output */ : /* no input */ : "r0"
517 );
518 #endif
519 #endif // AARCH64
520 }
521
522 bool os::is_allocatable(size_t bytes) {
523 return true;
524 }
525
526 ////////////////////////////////////////////////////////////////////////////////
527 // thread stack
528
529 // Minimum usable stack sizes required to get to user code. Space for
530 // HotSpot guard pages is added later.
531 size_t os::Posix::_compiler_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 4)) * K;
532 size_t os::Posix::_java_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 4)) * K;
533 size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K;
534
535 // return default stack size for thr_type
536 size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
537 // default stack size (compiler thread needs larger stack)
538 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
539 return s;
540 }
541
542 /////////////////////////////////////////////////////////////////////////////
543 // helper functions for fatal error handler
544
545 void os::print_context(outputStream *st, const void *context) {
546 if (context == NULL) return;
547 const ucontext_t *uc = (const ucontext_t*)context;
548
549 st->print_cr("Registers:");
550 intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0;
551 for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) {
552 st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]);
553 }
554 #define U64_FORMAT "0x%016llx"
555 #ifdef AARCH64
556 st->print_cr(" %-3s = " U64_FORMAT, "sp", uc->uc_mcontext.sp);
557 st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc);
558 st->print_cr(" %-3s = " U64_FORMAT, "pstate", uc->uc_mcontext.pstate);
559 #else
560 // now print flag register
561 st->print_cr(" %-4s = 0x%08lx", "cpsr",uc->uc_mcontext.arm_cpsr);
562 #endif
563 st->cr();
564
565 intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc);
566 st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp));
567 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
568 st->cr();
569
570 // Note: it may be unsafe to inspect memory near pc. For example, pc may
571 // point to garbage if entry point in an nmethod is corrupted. Leave
572 // this at the end, and hope for the best.
573 address pc = os::Linux::ucontext_get_pc(uc);
574 st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc));
575 print_hex_dump(st, pc - 32, pc + 32, Assembler::InstructionSize);
576 }
577
578 void os::print_register_info(outputStream *st, const void *context) {
579 if (context == NULL) return;
580
581 const ucontext_t *uc = (const ucontext_t*)context;
582 intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0;
583
584 st->print_cr("Register to memory mapping:");
585 st->cr();
586 for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) {
587 st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]);
588 print_location(st, reg_area[r]);
589 st->cr();
590 }
591 #ifdef AARCH64
592 st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc);
593 print_location(st, uc->uc_mcontext.pc);
594 st->cr();
595 #endif
596 st->cr();
597 }
598
599
600 #ifndef AARCH64
601
602 typedef jlong cmpxchg_long_func_t(jlong, jlong, volatile jlong*);
603
604 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
605
606 jlong os::atomic_cmpxchg_long_bootstrap(jlong compare_value, jlong exchange_value, volatile jlong* dest) {
607 // try to use the stub:
608 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
609
610 if (func != NULL) {
611 os::atomic_cmpxchg_long_func = func;
612 return (*func)(compare_value, exchange_value, dest);
613 }
614 assert(Threads::number_of_threads() == 0, "for bootstrap only");
615
616 jlong old_value = *dest;
617 if (old_value == compare_value)
618 *dest = exchange_value;
619 return old_value;
620 }
621 typedef jlong load_long_func_t(const volatile jlong*);
622
623 load_long_func_t* os::atomic_load_long_func = os::atomic_load_long_bootstrap;
624
625 jlong os::atomic_load_long_bootstrap(const volatile jlong* src) {
626 // try to use the stub:
627 load_long_func_t* func = CAST_TO_FN_PTR(load_long_func_t*, StubRoutines::atomic_load_long_entry());
628
629 if (func != NULL) {
630 os::atomic_load_long_func = func;
631 return (*func)(src);
632 }
633 assert(Threads::number_of_threads() == 0, "for bootstrap only");
634
635 jlong old_value = *src;
636 return old_value;
637 }
638
639 typedef void store_long_func_t(jlong, volatile jlong*);
640
641 store_long_func_t* os::atomic_store_long_func = os::atomic_store_long_bootstrap;
642
643 void os::atomic_store_long_bootstrap(jlong val, volatile jlong* dest) {
644 // try to use the stub:
645 store_long_func_t* func = CAST_TO_FN_PTR(store_long_func_t*, StubRoutines::atomic_store_long_entry());
646
647 if (func != NULL) {
648 os::atomic_store_long_func = func;
649 return (*func)(val, dest);
650 }
651 assert(Threads::number_of_threads() == 0, "for bootstrap only");
652
653 *dest = val;
654 }
655
656 typedef jint atomic_add_func_t(jint add_value, volatile jint *dest);
657
658 atomic_add_func_t * os::atomic_add_func = os::atomic_add_bootstrap;
659
660 jint os::atomic_add_bootstrap(jint add_value, volatile jint *dest) {
661 atomic_add_func_t * func = CAST_TO_FN_PTR(atomic_add_func_t*,
662 StubRoutines::atomic_add_entry());
663 if (func != NULL) {
664 os::atomic_add_func = func;
665 return (*func)(add_value, dest);
666 }
667
668 jint old_value = *dest;
669 *dest = old_value + add_value;
670 return (old_value + add_value);
671 }
672
673 typedef jint atomic_xchg_func_t(jint exchange_value, volatile jint *dest);
674
675 atomic_xchg_func_t * os::atomic_xchg_func = os::atomic_xchg_bootstrap;
676
677 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint *dest) {
678 atomic_xchg_func_t * func = CAST_TO_FN_PTR(atomic_xchg_func_t*,
679 StubRoutines::atomic_xchg_entry());
680 if (func != NULL) {
681 os::atomic_xchg_func = func;
682 return (*func)(exchange_value, dest);
683 }
684
685 jint old_value = *dest;
686 *dest = exchange_value;
687 return (old_value);
688 }
689
690 typedef jint cmpxchg_func_t(jint, jint, volatile jint*);
691
692 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
693
694 jint os::atomic_cmpxchg_bootstrap(jint compare_value, jint exchange_value, volatile jint* dest) {
695 // try to use the stub:
696 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
697
698 if (func != NULL) {
699 os::atomic_cmpxchg_func = func;
700 return (*func)(compare_value, exchange_value, dest);
701 }
702 assert(Threads::number_of_threads() == 0, "for bootstrap only");
703
704 jint old_value = *dest;
705 if (old_value == compare_value)
706 *dest = exchange_value;
707 return old_value;
708 }
709
710 #endif // !AARCH64
711
712 #ifndef PRODUCT
713 void os::verify_stack_alignment() {
714 }
715 #endif
716
717 int os::extra_bang_size_in_bytes() {
718 // ARM does not require an additional stack bang.
719 return 0;
720 }
721