--- /dev/null 2016-08-24 15:41:39.598575000 -0400 +++ new/hotspot/src/os_cpu/linux_arm/vm/os_linux_arm.cpp 2016-12-02 11:25:44.118821040 -0500 @@ -0,0 +1,804 @@ +/* + * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +// no precompiled headers +#include "assembler_arm.inline.hpp" +#include "classfile/classLoader.hpp" +#include "classfile/systemDictionary.hpp" +#include "classfile/vmSymbols.hpp" +#include "code/icBuffer.hpp" +#include "code/vtableStubs.hpp" +#include "interpreter/interpreter.hpp" +#include "jvm_linux.h" +#include "memory/allocation.inline.hpp" +#include "nativeInst_arm.hpp" +#include "os_share_linux.hpp" +#include "prims/jniFastGetField.hpp" +#include "prims/jvm.h" +#include "prims/jvm_misc.hpp" +#include "runtime/arguments.hpp" +#include "runtime/extendedPC.hpp" +#include "runtime/frame.inline.hpp" +#include "runtime/interfaceSupport.hpp" +#include "runtime/java.hpp" +#include "runtime/javaCalls.hpp" +#include "runtime/mutexLocker.hpp" +#include "runtime/osThread.hpp" +#include "runtime/sharedRuntime.hpp" +#include "runtime/stubRoutines.hpp" +#include "runtime/timer.hpp" +#include "utilities/events.hpp" +#include "utilities/vmError.hpp" + +// put OS-includes here +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include + +#define SPELL_REG_SP "sp" + +// Don't #define SPELL_REG_FP for thumb because it is not safe to use, so this makes sure we never fetch it. +#ifndef __thumb__ +#define SPELL_REG_FP AARCH64_ONLY("x29") NOT_AARCH64("fp") +#endif + +address os::current_stack_pointer() { + register address sp __asm__ (SPELL_REG_SP); + return sp; +} + +char* os::non_memory_address_word() { + // Must never look like an address returned by reserve_memory + return (char*) -1; +} + +void os::initialize_thread(Thread* thr) { + // Nothing to do +} + +#ifdef AARCH64 + +#define arm_pc pc +#define arm_sp sp +#define arm_fp regs[29] +#define arm_r0 regs[0] +#define ARM_REGS_IN_CONTEXT 31 + +#else + +#if NGREG == 16 +// These definitions are based on the observation that until +// the certain version of GCC mcontext_t was defined as +// a structure containing gregs[NGREG] array with 16 elements. +// In later GCC versions mcontext_t was redefined as struct sigcontext, +// along with NGREG constant changed to 18. +#define arm_pc gregs[15] +#define arm_sp gregs[13] +#define arm_fp gregs[11] +#define arm_r0 gregs[0] +#endif + +#define ARM_REGS_IN_CONTEXT 16 + +#endif // AARCH64 + +address os::Linux::ucontext_get_pc(const ucontext_t* uc) { + return (address)uc->uc_mcontext.arm_pc; +} + +void os::Linux::ucontext_set_pc(ucontext_t* uc, address pc) { + uc->uc_mcontext.arm_pc = (uintx)pc; +} + +intptr_t* os::Linux::ucontext_get_sp(const ucontext_t* uc) { + return (intptr_t*)uc->uc_mcontext.arm_sp; +} + +intptr_t* os::Linux::ucontext_get_fp(const ucontext_t* uc) { + return (intptr_t*)uc->uc_mcontext.arm_fp; +} + +bool is_safe_for_fp(address pc) { +#ifdef __thumb__ + if (CodeCache::find_blob(pc) != NULL) { + return true; + } + // For thumb C frames, given an fp we have no idea how to access the frame contents. + return false; +#else + // Calling os::address_is_in_vm() here leads to a dladdr call. Calling any libc + // function during os::get_native_stack() can result in a deadlock if JFR is + // enabled. For now, be more lenient and allow all pc's. There are other + // frame sanity checks in shared code, and to date they have been sufficient + // for other platforms. + //return os::address_is_in_vm(pc); + return true; +#endif +} + +// For Forte Analyzer AsyncGetCallTrace profiling support - thread +// is currently interrupted by SIGPROF. +// os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal +// frames. Currently we don't do that on Linux, so it's the same as +// os::fetch_frame_from_context(). +ExtendedPC os::Linux::fetch_frame_from_ucontext(Thread* thread, + const ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { + + assert(thread != NULL, "just checking"); + assert(ret_sp != NULL, "just checking"); + assert(ret_fp != NULL, "just checking"); + + return os::fetch_frame_from_context(uc, ret_sp, ret_fp); +} + +ExtendedPC os::fetch_frame_from_context(const void* ucVoid, + intptr_t** ret_sp, intptr_t** ret_fp) { + + ExtendedPC epc; + const ucontext_t* uc = (const ucontext_t*)ucVoid; + + if (uc != NULL) { + epc = ExtendedPC(os::Linux::ucontext_get_pc(uc)); + if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc); + if (ret_fp) { + intptr_t* fp = os::Linux::ucontext_get_fp(uc); +#ifndef __thumb__ + if (CodeCache::find_blob(epc.pc()) == NULL) { + // It's a C frame. We need to adjust the fp. + fp += os::C_frame_offset; + } +#endif + // Clear FP when stack walking is dangerous so that + // the frame created will not be walked. + // However, ensure FP is set correctly when reliable and + // potentially necessary. + if (!is_safe_for_fp(epc.pc())) { + // FP unreliable + fp = (intptr_t *)NULL; + } + *ret_fp = fp; + } + } else { + // construct empty ExtendedPC for return value checking + epc = ExtendedPC(NULL); + if (ret_sp) *ret_sp = (intptr_t *)NULL; + if (ret_fp) *ret_fp = (intptr_t *)NULL; + } + + return epc; +} + +frame os::fetch_frame_from_context(const void* ucVoid) { + intptr_t* sp; + intptr_t* fp; + ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); + return frame(sp, fp, epc.pc()); +} + +frame os::get_sender_for_C_frame(frame* fr) { +#ifdef __thumb__ + // We can't reliably get anything from a thumb C frame. + return frame(); +#else + address pc = fr->sender_pc(); + if (! is_safe_for_fp(pc)) { + return frame(fr->sender_sp(), (intptr_t *)NULL, pc); + } else { + return frame(fr->sender_sp(), fr->link() + os::C_frame_offset, pc); + } +#endif +} + +// +// This actually returns two frames up. It does not return os::current_frame(), +// which is the actual current frame. Nor does it return os::get_native_stack(), +// which is the caller. It returns whoever called os::get_native_stack(). Not +// very intuitive, but consistent with how this API is implemented on other +// platforms. +// +frame os::current_frame() { +#ifdef __thumb__ + // We can't reliably get anything from a thumb C frame. + return frame(); +#else + register intptr_t* fp __asm__ (SPELL_REG_FP); + // fp is for os::current_frame. We want the fp for our caller. + frame myframe((intptr_t*)os::current_stack_pointer(), fp + os::C_frame_offset, + CAST_FROM_FN_PTR(address, os::current_frame)); + frame caller_frame = os::get_sender_for_C_frame(&myframe); + + if (os::is_first_C_frame(&caller_frame)) { + // stack is not walkable + // Assert below was added because it does not seem like this can ever happen. + // How can this frame ever be the first C frame since it is called from C code? + // If it does ever happen, undo the assert and comment here on when/why it happens. + assert(false, "this should never happen"); + return frame(); + } + + // return frame for our caller's caller + return os::get_sender_for_C_frame(&caller_frame); +#endif +} + +#ifndef AARCH64 +extern "C" address check_vfp_fault_instr; +extern "C" address check_vfp3_32_fault_instr; + +address check_vfp_fault_instr = NULL; +address check_vfp3_32_fault_instr = NULL; +#endif // !AARCH64 +extern "C" address check_simd_fault_instr; +address check_simd_fault_instr = NULL; + +// Utility functions + +extern "C" int JVM_handle_linux_signal(int sig, siginfo_t* info, + void* ucVoid, int abort_if_unrecognized) { + ucontext_t* uc = (ucontext_t*) ucVoid; + + Thread* t = Thread::current_or_null_safe(); + + // Must do this before SignalHandlerMark, if crash protection installed we will longjmp away + // (no destructors can be run) + os::WatcherThreadCrashProtection::check_crash_protection(sig, t); + + SignalHandlerMark shm(t); + + if (sig == SIGILL && + ((info->si_addr == (caddr_t)check_simd_fault_instr) + NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp_fault_instr) + NOT_AARCH64(|| info->si_addr == (caddr_t)check_vfp3_32_fault_instr))) { + // skip faulty instruction + instruction that sets return value to + // success and set return value to failure. + os::Linux::ucontext_set_pc(uc, (address)info->si_addr + 8); + uc->uc_mcontext.arm_r0 = 0; + return true; + } + + // Note: it's not uncommon that JNI code uses signal/sigset to install + // then restore certain signal handler (e.g. to temporarily block SIGPIPE, + // or have a SIGILL handler when detecting CPU type). When that happens, + // JVM_handle_linux_signal() might be invoked with junk info/ucVoid. To + // avoid unnecessary crash when libjsig is not preloaded, try handle signals + // that do not require siginfo/ucontext first. + + if (sig == SIGPIPE || sig == SIGXFSZ) { + // allow chained handler to go first + if (os::Linux::chained_handler(sig, info, ucVoid)) { + return true; + } else { + // Ignoring SIGPIPE/SIGXFSZ - see bugs 4229104 or 6499219 + return true; + } + } + + JavaThread* thread = NULL; + VMThread* vmthread = NULL; + if (os::Linux::signal_handlers_are_installed) { + if (t != NULL ){ + if(t->is_Java_thread()) { + thread = (JavaThread*)t; + } + else if(t->is_VM_thread()){ + vmthread = (VMThread *)t; + } + } + } + + address stub = NULL; + address pc = NULL; + bool unsafe_access = false; + + if (info != NULL && uc != NULL && thread != NULL) { + pc = (address) os::Linux::ucontext_get_pc(uc); + + // Handle ALL stack overflow variations here + if (sig == SIGSEGV) { + address addr = (address) info->si_addr; + + if (StubRoutines::is_safefetch_fault(pc)) { + os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); + return 1; + } + // check if fault address is within thread stack + if (addr < thread->stack_base() && + addr >= thread->stack_base() - thread->stack_size()) { + // stack overflow + if (thread->in_stack_yellow_reserved_zone(addr)) { + thread->disable_stack_yellow_reserved_zone(); + if (thread->thread_state() == _thread_in_Java) { + // Throw a stack overflow exception. Guard pages will be reenabled + // while unwinding the stack. + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); + } else { + // Thread was in the vm or native code. Return and try to finish. + return 1; + } + } else if (thread->in_stack_red_zone(addr)) { + // Fatal red zone violation. Disable the guard pages and fall through + // to handle_unexpected_exception way down below. + thread->disable_stack_red_zone(); + tty->print_raw_cr("An irrecoverable stack overflow has occurred."); + } else { + // Accessing stack address below sp may cause SEGV if current + // thread has MAP_GROWSDOWN stack. This should only happen when + // current thread was created by user code with MAP_GROWSDOWN flag + // and then attached to VM. See notes in os_linux.cpp. + if (thread->osthread()->expanding_stack() == 0) { + thread->osthread()->set_expanding_stack(); + if (os::Linux::manually_expand_stack(thread, addr)) { + thread->osthread()->clear_expanding_stack(); + return 1; + } + thread->osthread()->clear_expanding_stack(); + } else { + fatal("recursive segv. expanding stack."); + } + } + } + } + + if (thread->thread_state() == _thread_in_Java) { + // Java thread running in Java code => find exception handler if any + // a fault inside compiled code, the interpreter, or a stub + + if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { + stub = SharedRuntime::get_poll_stub(pc); + } else if (sig == SIGBUS) { + // BugId 4454115: A read from a MappedByteBuffer can fault + // here if the underlying file has been truncated. + // Do not crash the VM in such a case. + CodeBlob* cb = CodeCache::find_blob_unsafe(pc); + CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; + if (nm != NULL && nm->has_unsafe_access()) { + unsafe_access = true; + } + } else if (sig == SIGSEGV && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { + // Determination of interpreter/vtable stub/compiled code null exception + CodeBlob* cb = CodeCache::find_blob_unsafe(pc); + if (cb != NULL) { + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); + } + } else if (sig == SIGILL && *(int *)pc == NativeInstruction::zombie_illegal_instruction) { + // Zombie + stub = SharedRuntime::get_handle_wrong_method_stub(); + } + } else if (thread->thread_state() == _thread_in_vm && + sig == SIGBUS && thread->doing_unsafe_access()) { + unsafe_access = true; + } + + // jni_fast_GetField can trap at certain pc's if a GC kicks in + // and the heap gets shrunk before the field access. + if (sig == SIGSEGV || sig == SIGBUS) { + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + stub = addr; + } + } + + // Check to see if we caught the safepoint code in the + // process of write protecting the memory serialization page. + // It write enables the page immediately after protecting it + // so we can just return to retry the write. + if (sig == SIGSEGV && os::is_memory_serialize_page(thread, (address) info->si_addr)) { + // Block current thread until the memory serialize page permission restored. + os::block_on_serialize_page_trap(); + return true; + } + } + + if (unsafe_access && stub == NULL) { + // it can be an unsafe access and we haven't found + // any other suitable exception reason, + // so assume it is an unsafe access. + address next_pc = pc + Assembler::InstructionSize; +#ifdef __thumb__ + if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) { + next_pc = (address)((intptr_t)next_pc | 0x1); + } +#endif + + stub = SharedRuntime::handle_unsafe_access(thread, next_pc); + } + + if (stub != NULL) { +#ifdef __thumb__ + if (uc->uc_mcontext.arm_cpsr & PSR_T_BIT) { + intptr_t p = (intptr_t)pc | 0x1; + pc = (address)p; + + // Clear Thumb mode bit if we're redirected into the ARM ISA based code + if (((intptr_t)stub & 0x1) == 0) { + uc->uc_mcontext.arm_cpsr &= ~PSR_T_BIT; + } + } else { + // No Thumb2 compiled stubs are triggered from ARM ISA compiled JIT'd code today. + // The support needs to be added if that changes + assert((((intptr_t)stub & 0x1) == 0), "can't return to Thumb code"); + } +#endif + + // save all thread context in case we need to restore it + if (thread != NULL) thread->set_saved_exception_pc(pc); + + os::Linux::ucontext_set_pc(uc, stub); + return true; + } + + // signal-chaining + if (os::Linux::chained_handler(sig, info, ucVoid)) { + return true; + } + + if (!abort_if_unrecognized) { + // caller wants another chance, so give it to him + return false; + } + + if (pc == NULL && uc != NULL) { + pc = os::Linux::ucontext_get_pc(uc); + } + + // unmask current signal + sigset_t newset; + sigemptyset(&newset); + sigaddset(&newset, sig); + sigprocmask(SIG_UNBLOCK, &newset, NULL); + + VMError::report_and_die(t, sig, pc, info, ucVoid); + + ShouldNotReachHere(); + return false; +} + +void os::Linux::init_thread_fpu_state(void) { + os::setup_fpu(); +} + +int os::Linux::get_fpu_control_word(void) { + return 0; +} + +void os::Linux::set_fpu_control_word(int fpu_control) { + // Nothing to do +} + +void os::setup_fpu() { +#ifdef AARCH64 + __asm__ volatile ("msr fpcr, xzr"); +#else +#if !defined(__SOFTFP__) && defined(__VFP_FP__) + // Turn on IEEE-754 compliant VFP mode + __asm__ volatile ( + "mov %%r0, #0;" + "fmxr fpscr, %%r0" + : /* no output */ : /* no input */ : "r0" + ); +#endif +#endif // AARCH64 +} + +bool os::is_allocatable(size_t bytes) { + return true; +} + +//////////////////////////////////////////////////////////////////////////////// +// thread stack + +size_t os::Posix::_compiler_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K; +size_t os::Posix::_java_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K; +size_t os::Posix::_vm_internal_thread_min_stack_allowed = (48 DEBUG_ONLY(+ 4)) * K; + +// return default stack size for thr_type +size_t os::Posix::default_stack_size(os::ThreadType thr_type) { + // default stack size (compiler thread needs larger stack) + size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); + return s; +} + +size_t os::Linux::default_guard_size(os::ThreadType thr_type) { + // Creating guard page is very expensive. Java thread has HotSpot + // guard page, only enable glibc guard page for non-Java threads. + return (thr_type == java_thread ? 0 : page_size()); +} + +// Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ JavaThread created by VM does not have glibc +// | glibc guard page | - guard, attached Java thread usually has +// | |/ 1 page glibc guard. +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | HotSpot Guard Pages | - red and yellow pages +// | |/ +// +------------------------+ JavaThread::stack_yellow_zone_base() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// Non-Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ +// | glibc guard page | - usually 1 page +// | |/ +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from +// pthread_attr_getstack() + +static void current_stack_region(address * bottom, size_t * size) { + if (os::Linux::is_initial_thread()) { + // initial thread needs special handling because pthread_getattr_np() + // may return bogus value. + *bottom = os::Linux::initial_thread_stack_bottom(); + *size = os::Linux::initial_thread_stack_size(); + } else { + pthread_attr_t attr; + + int rslt = pthread_getattr_np(pthread_self(), &attr); + + // JVM needs to know exact stack location, abort if it fails + if (rslt != 0) { + if (rslt == ENOMEM) { + vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); + } else { + fatal("pthread_getattr_np failed"); + } + } + + if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { + fatal("Can not locate current stack attributes!"); + } + + pthread_attr_destroy(&attr); + + } + assert(os::current_stack_pointer() >= *bottom && + os::current_stack_pointer() < *bottom + *size, "just checking"); +} + +address os::current_stack_base() { + address bottom; + size_t size; + current_stack_region(&bottom, &size); + return (bottom + size); +} + +size_t os::current_stack_size() { + // stack size includes normal stack and HotSpot guard pages + address bottom; + size_t size; + current_stack_region(&bottom, &size); + return size; +} + +///////////////////////////////////////////////////////////////////////////// +// helper functions for fatal error handler + +void os::print_context(outputStream *st, const void *context) { + if (context == NULL) return; + const ucontext_t *uc = (const ucontext_t*)context; + + st->print_cr("Registers:"); + intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0; + for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) { + st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]); + } +#define U64_FORMAT "0x%016llx" +#ifdef AARCH64 + st->print_cr(" %-3s = " U64_FORMAT, "sp", uc->uc_mcontext.sp); + st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc); + st->print_cr(" %-3s = " U64_FORMAT, "pstate", uc->uc_mcontext.pstate); +#else + // now print flag register + st->print_cr(" %-4s = 0x%08lx", "cpsr",uc->uc_mcontext.arm_cpsr); +#endif + st->cr(); + + intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); + st->print_cr("Top of Stack: (sp=" INTPTR_FORMAT ")", p2i(sp)); + print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); + st->cr(); + + // Note: it may be unsafe to inspect memory near pc. For example, pc may + // point to garbage if entry point in an nmethod is corrupted. Leave + // this at the end, and hope for the best. + address pc = os::Linux::ucontext_get_pc(uc); + st->print_cr("Instructions: (pc=" INTPTR_FORMAT ")", p2i(pc)); + print_hex_dump(st, pc - 32, pc + 32, Assembler::InstructionSize); +} + +void os::print_register_info(outputStream *st, const void *context) { + if (context == NULL) return; + + const ucontext_t *uc = (const ucontext_t*)context; + intx* reg_area = (intx*)&uc->uc_mcontext.arm_r0; + + st->print_cr("Register to memory mapping:"); + st->cr(); + for (int r = 0; r < ARM_REGS_IN_CONTEXT; r++) { + st->print_cr(" %-3s = " INTPTR_FORMAT, as_Register(r)->name(), reg_area[r]); + print_location(st, reg_area[r]); + st->cr(); + } +#ifdef AARCH64 + st->print_cr(" %-3s = " U64_FORMAT, "pc", uc->uc_mcontext.pc); + print_location(st, uc->uc_mcontext.pc); + st->cr(); +#endif + st->cr(); +} + + +#ifndef AARCH64 + +typedef jlong cmpxchg_long_func_t(jlong, jlong, volatile jlong*); + +cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap; + +jlong os::atomic_cmpxchg_long_bootstrap(jlong compare_value, jlong exchange_value, volatile jlong* dest) { + // try to use the stub: + cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry()); + + if (func != NULL) { + os::atomic_cmpxchg_long_func = func; + return (*func)(compare_value, exchange_value, dest); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jlong old_value = *dest; + if (old_value == compare_value) + *dest = exchange_value; + return old_value; +} +typedef jlong load_long_func_t(volatile jlong*); + +load_long_func_t* os::atomic_load_long_func = os::atomic_load_long_bootstrap; + +jlong os::atomic_load_long_bootstrap(volatile jlong* src) { + // try to use the stub: + load_long_func_t* func = CAST_TO_FN_PTR(load_long_func_t*, StubRoutines::atomic_load_long_entry()); + + if (func != NULL) { + os::atomic_load_long_func = func; + return (*func)(src); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jlong old_value = *src; + return old_value; +} + +typedef void store_long_func_t(jlong, volatile jlong*); + +store_long_func_t* os::atomic_store_long_func = os::atomic_store_long_bootstrap; + +void os::atomic_store_long_bootstrap(jlong val, volatile jlong* dest) { + // try to use the stub: + store_long_func_t* func = CAST_TO_FN_PTR(store_long_func_t*, StubRoutines::atomic_store_long_entry()); + + if (func != NULL) { + os::atomic_store_long_func = func; + return (*func)(val, dest); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + *dest = val; +} + +typedef jint atomic_add_func_t(jint add_value, volatile jint *dest); + +atomic_add_func_t * os::atomic_add_func = os::atomic_add_bootstrap; + +jint os::atomic_add_bootstrap(jint add_value, volatile jint *dest) { + atomic_add_func_t * func = CAST_TO_FN_PTR(atomic_add_func_t*, + StubRoutines::atomic_add_entry()); + if (func != NULL) { + os::atomic_add_func = func; + return (*func)(add_value, dest); + } + + jint old_value = *dest; + *dest = old_value + add_value; + return (old_value + add_value); +} + +typedef jint atomic_xchg_func_t(jint exchange_value, volatile jint *dest); + +atomic_xchg_func_t * os::atomic_xchg_func = os::atomic_xchg_bootstrap; + +jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint *dest) { + atomic_xchg_func_t * func = CAST_TO_FN_PTR(atomic_xchg_func_t*, + StubRoutines::atomic_xchg_entry()); + if (func != NULL) { + os::atomic_xchg_func = func; + return (*func)(exchange_value, dest); + } + + jint old_value = *dest; + *dest = exchange_value; + return (old_value); +} + +typedef jint cmpxchg_func_t(jint, jint, volatile jint*); + +cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap; + +jint os::atomic_cmpxchg_bootstrap(jint compare_value, jint exchange_value, volatile jint* dest) { + // try to use the stub: + cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry()); + + if (func != NULL) { + os::atomic_cmpxchg_func = func; + return (*func)(compare_value, exchange_value, dest); + } + assert(Threads::number_of_threads() == 0, "for bootstrap only"); + + jint old_value = *dest; + if (old_value == compare_value) + *dest = exchange_value; + return old_value; +} + +#endif // !AARCH64 + +#ifndef PRODUCT +void os::verify_stack_alignment() { +} +#endif + +int os::extra_bang_size_in_bytes() { + // ARM does not require an additional stack bang. + return 0; +} +