| /* |
| * Copyright (c) 2008, 2017, 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 <sys/types.h> |
| # include <sys/mman.h> |
| # include <pthread.h> |
| # include <signal.h> |
| # include <errno.h> |
| # include <dlfcn.h> |
| # include <stdlib.h> |
| # include <stdio.h> |
| # include <unistd.h> |
| # include <sys/resource.h> |
| # include <pthread.h> |
| # include <sys/stat.h> |
| # include <sys/time.h> |
| # include <sys/utsname.h> |
| # include <sys/socket.h> |
| # include <sys/wait.h> |
| # include <pwd.h> |
| # include <poll.h> |
| # include <ucontext.h> |
| # include <fpu_control.h> |
| # include <asm/ptrace.h> |
| |
| #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::ThreadCrashProtection::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_Get<Primitive>Field 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 |
| |
| // Minimum usable stack sizes required to get to user code. Space for |
| // HotSpot guard pages is added later. |
| size_t os::Posix::_compiler_thread_min_stack_allowed = (32 DEBUG_ONLY(+ 4)) * K; |
| size_t os::Posix::_java_thread_min_stack_allowed = (32 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; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // 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(const volatile jlong*); |
| |
| load_long_func_t* os::atomic_load_long_func = os::atomic_load_long_bootstrap; |
| |
| jlong os::atomic_load_long_bootstrap(const 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; |
| } |
| |