8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse
2025-08-23 04:44:49 +02:00 · 2017-09-12 19:03:39 +02:00 · 2017-09-12 19:03:39 +02:00 · 3789983e89
commit 3789983e89
parent 270fe13182
56923 changed files with 3 additions and 15727 deletions
--- a/src/hotspot/os_cpu/linux_arm/os_linux_arm.cpp
+++ b/src/hotspot/os_cpu/linux_arm/os_linux_arm.cpp
@ -0,0 +1,721 @@
+/*
+ * 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;
+}
+