jdk

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/*
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 * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
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 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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// no precompiled headers
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#include "asm/assembler.inline.hpp"
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#include "atomic_bsd_zero.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/vtableStubs.hpp"
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#include "interpreter/interpreter.hpp"
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#include "jvm.h"
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#include "memory/allocation.inline.hpp"
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#include "nativeInst_zero.hpp"
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#include "os_bsd.hpp"
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#include "os_posix.hpp"
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#include "prims/jniFastGetField.hpp"
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#include "prims/jvm_misc.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/frame.inline.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/javaThread.hpp"
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#include "runtime/mutexLocker.hpp"
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#include "runtime/osThread.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/stubRoutines.hpp"
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#include "runtime/timer.hpp"
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#include "signals_posix.hpp"
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#include "utilities/events.hpp"
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#include "utilities/vmError.hpp"
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#if !defined(__APPLE__) && !defined(__NetBSD__)
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#include <pthread.h>
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# include <pthread_np.h> /* For pthread_attr_get_np */
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#endif
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address os::current_stack_pointer() {
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  address dummy = (address) &dummy;
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  return dummy;
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}
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frame os::get_sender_for_C_frame(frame* fr) {
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  ShouldNotCallThis();
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  return frame();
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}
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frame os::current_frame() {
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  // The only thing that calls this is the stack printing code in
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  // VMError::report:
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  //   - Step 110 (printing stack bounds) uses the sp in the frame
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  //     to determine the amount of free space on the stack.  We
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  //     set the sp to a close approximation of the real value in
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  //     order to allow this step to complete.
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  //   - Step 120 (printing native stack) tries to walk the stack.
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  //     The frame we create has a null pc, which is ignored as an
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  //     invalid frame.
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  frame dummy = frame();
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  dummy.set_sp((intptr_t *) current_stack_pointer());
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  return dummy;
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}
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char* os::non_memory_address_word() {
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  // Must never look like an address returned by reserve_memory,
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  // even in its subfields (as defined by the CPU immediate fields,
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  // if the CPU splits constants across multiple instructions).
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  // This is the value for x86; works pretty well for PPC too.
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  return (char *) -1;
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}
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address os::Posix::ucontext_get_pc(const ucontext_t* uc) {
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  ShouldNotCallThis();
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  return nullptr;
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}
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void os::Posix::ucontext_set_pc(ucontext_t * uc, address pc) {
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  ShouldNotCallThis();
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}
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address os::fetch_frame_from_context(const void* ucVoid,
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                                     intptr_t** ret_sp,
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                                     intptr_t** ret_fp) {
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  ShouldNotCallThis();
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  return nullptr;
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}
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frame os::fetch_frame_from_context(const void* ucVoid) {
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  ShouldNotCallThis();
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  return frame();
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}
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bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
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                                             ucontext_t* uc, JavaThread* thread) {
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  if (info != nullptr && thread != nullptr) {
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    // Handle ALL stack overflow variations here
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    if (sig == SIGSEGV || sig == SIGBUS) {
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      address addr = (address) info->si_addr;
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      // check if fault address is within thread stack
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      if (thread->is_in_full_stack(addr)) {
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        StackOverflow* overflow_state = thread->stack_overflow_state();
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        // stack overflow
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        if (overflow_state->in_stack_yellow_reserved_zone(addr)) {
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          overflow_state->disable_stack_yellow_reserved_zone();
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          ShouldNotCallThis();
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        }
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        else if (overflow_state->in_stack_red_zone(addr)) {
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          overflow_state->disable_stack_red_zone();
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          ShouldNotCallThis();
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        }
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      }
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    }
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    /*if (thread->thread_state() == _thread_in_Java) {
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      ShouldNotCallThis();
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    }
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    else*/ if ((thread->thread_state() == _thread_in_vm ||
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               thread->thread_state() == _thread_in_native) &&
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               sig == SIGBUS && thread->doing_unsafe_access()) {
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      ShouldNotCallThis();
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    }
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    // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC
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    // kicks in and the heap gets shrunk before the field access.
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    /*if (sig == SIGSEGV || sig == SIGBUS) {
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      address addr = JNI_FastGetField::find_slowcase_pc(pc);
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      if (addr != (address)-1) {
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        stub = addr;
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      }
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    }*/
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  }
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  return false;
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}
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void os::Bsd::init_thread_fpu_state(void) {
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  // Nothing to do
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}
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///////////////////////////////////////////////////////////////////////////////
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// thread stack
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size_t os::_compiler_thread_min_stack_allowed = 64 * K;
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size_t os::_java_thread_min_stack_allowed = 64 * K;
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size_t os::_vm_internal_thread_min_stack_allowed = 64 * K;
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size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
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#ifdef _LP64
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  size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
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#else
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  size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K);
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#endif // _LP64
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  return s;
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}
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void os::current_stack_base_and_size(address* base, size_t* size) {
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  address bottom;
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#ifdef __APPLE__
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  pthread_t self = pthread_self();
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  *base = (address) pthread_get_stackaddr_np(self);
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  *size = pthread_get_stacksize_np(self);
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  bottom = *base - *size;
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#elif defined(__OpenBSD__)
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  stack_t ss;
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  int rslt = pthread_stackseg_np(pthread_self(), &ss);
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  if (rslt != 0)
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    fatal("pthread_stackseg_np failed with error = %d", rslt);
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  *base = (address) ss.ss_sp;
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  *size  = ss.ss_size;
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  bottom = *base - *size;
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#else
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  pthread_attr_t attr;
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  int rslt = pthread_attr_init(&attr);
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  // JVM needs to know exact stack location, abort if it fails
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  if (rslt != 0)
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    fatal("pthread_attr_init failed with error = %d", rslt);
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  rslt = pthread_attr_get_np(pthread_self(), &attr);
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  if (rslt != 0)
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    fatal("pthread_attr_get_np failed with error = %d", rslt);
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  if (pthread_attr_getstackaddr(&attr, (void **) &bottom) != 0 ||
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      pthread_attr_getstacksize(&attr, size) != 0) {
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    fatal("Can not locate current stack attributes!");
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  }
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  *base = bottom + *size;
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  pthread_attr_destroy(&attr);
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#endif
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  assert(os::current_stack_pointer() >= bottom &&
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         os::current_stack_pointer() < *base, "just checking");
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}
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/////////////////////////////////////////////////////////////////////////////
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// helper functions for fatal error handler
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void os::print_context(outputStream* st, const void* context) {
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  ShouldNotCallThis();
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}
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void os::print_tos_pc(outputStream *st, const void *context) {
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  ShouldNotCallThis();
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}
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void os::print_register_info(outputStream *st, const void *context, int& continuation) {
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  ShouldNotCallThis();
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}
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/////////////////////////////////////////////////////////////////////////////
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// Stubs for things that would be in bsd_zero.s if it existed.
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// You probably want to disassemble these monkeys to check they're ok.
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extern "C" {
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  int SpinPause() {
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    return 1;
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  }
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  void _Copy_conjoint_jshorts_atomic(const jshort* from, jshort* to, size_t count) {
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    if (from > to) {
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      const jshort *end = from + count;
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      while (from < end)
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        *(to++) = *(from++);
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    }
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    else if (from < to) {
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      const jshort *end = from;
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      from += count - 1;
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      to   += count - 1;
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      while (from >= end)
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        *(to--) = *(from--);
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    }
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  }
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  void _Copy_conjoint_jints_atomic(const jint* from, jint* to, size_t count) {
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    if (from > to) {
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      const jint *end = from + count;
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      while (from < end)
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        *(to++) = *(from++);
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    }
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    else if (from < to) {
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      const jint *end = from;
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      from += count - 1;
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      to   += count - 1;
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      while (from >= end)
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        *(to--) = *(from--);
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    }
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  }
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  void _Copy_conjoint_jlongs_atomic(const jlong* from, jlong* to, size_t count) {
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    if (from > to) {
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      const jlong *end = from + count;
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      while (from < end)
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        atomic_copy64(from++, to++);
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    }
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    else if (from < to) {
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      const jlong *end = from;
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      from += count - 1;
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      to   += count - 1;
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      while (from >= end)
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        atomic_copy64(from--, to--);
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    }
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  }
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  void _Copy_arrayof_conjoint_bytes(const HeapWord* from,
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                                    HeapWord* to,
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                                    size_t    count) {
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    memmove(to, from, count);
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  }
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  void _Copy_arrayof_conjoint_jshorts(const HeapWord* from,
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                                      HeapWord* to,
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                                      size_t    count) {
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    memmove(to, from, count * 2);
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  }
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  void _Copy_arrayof_conjoint_jints(const HeapWord* from,
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                                    HeapWord* to,
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                                    size_t    count) {
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    memmove(to, from, count * 4);
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  }
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  void _Copy_arrayof_conjoint_jlongs(const HeapWord* from,
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                                     HeapWord* to,
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                                     size_t    count) {
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    memmove(to, from, count * 8);
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  }
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};
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#ifndef PRODUCT
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void os::verify_stack_alignment() {
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}
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#endif
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int os::extra_bang_size_in_bytes() {
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  // Zero does not require an additional stack bang.
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  return 0;
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}
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#if defined(AARCH64) && defined(__APPLE__)
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void os::current_thread_enable_wx(WXMode mode) {
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  pthread_jit_write_protect_np(mode == WXExec);
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}
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#endif
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void os::setup_fpu() {}
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