mirror of
https://github.com/openjdk/jdk.git
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538 lines
18 KiB
C++
538 lines
18 KiB
C++
/*
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* Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2020, 2022, Huawei Technologies Co., Ltd. All rights reserved.
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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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#include "asm/macroAssembler.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/codeCache.hpp"
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#include "code/nativeInst.hpp"
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#include "code/vtableStubs.hpp"
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#include "cppstdlib/cstdlib.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 "os_linux.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/globals.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/safepointMechanism.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/debug.hpp"
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#include "utilities/events.hpp"
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#include "utilities/vmError.hpp"
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// put OS-includes here
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# include <dlfcn.h>
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# include <errno.h>
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# include <fpu_control.h>
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# include <linux/ptrace.h>
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# include <pthread.h>
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# include <signal.h>
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# include <stdio.h>
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# include <sys/mman.h>
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# include <sys/resource.h>
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# include <sys/socket.h>
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# include <sys/stat.h>
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# include <sys/time.h>
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# include <sys/types.h>
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# include <sys/utsname.h>
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# include <sys/wait.h>
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# include <poll.h>
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# include <pwd.h>
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# include <ucontext.h>
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# include <unistd.h>
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#define REG_LR 1
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#define REG_FP 8
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#define REG_BCP 22
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NOINLINE address os::current_stack_pointer() {
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return (address)__builtin_frame_address(0);
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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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return (char*) 0xffffffffffff;
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}
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address os::Posix::ucontext_get_pc(const ucontext_t * uc) {
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return (address)uc->uc_mcontext.__gregs[REG_PC];
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}
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void os::Posix::ucontext_set_pc(ucontext_t * uc, address pc) {
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uc->uc_mcontext.__gregs[REG_PC] = (intptr_t)pc;
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}
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intptr_t* os::Linux::ucontext_get_sp(const ucontext_t * uc) {
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return (intptr_t*)uc->uc_mcontext.__gregs[REG_SP];
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}
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intptr_t* os::Linux::ucontext_get_fp(const ucontext_t * uc) {
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return (intptr_t*)uc->uc_mcontext.__gregs[REG_FP];
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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, intptr_t** ret_fp) {
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address epc;
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const ucontext_t* uc = (const ucontext_t*)ucVoid;
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if (uc != nullptr) {
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epc = os::Posix::ucontext_get_pc(uc);
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if (ret_sp != nullptr) {
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*ret_sp = os::Linux::ucontext_get_sp(uc);
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}
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if (ret_fp != nullptr) {
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*ret_fp = os::Linux::ucontext_get_fp(uc);
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}
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} else {
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epc = nullptr;
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if (ret_sp != nullptr) {
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*ret_sp = (intptr_t *)nullptr;
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}
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if (ret_fp != nullptr) {
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*ret_fp = (intptr_t *)nullptr;
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}
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}
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return epc;
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}
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frame os::fetch_compiled_frame_from_context(const void* ucVoid) {
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const ucontext_t* uc = (const ucontext_t*)ucVoid;
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// In compiled code, the stack banging is performed before RA
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// has been saved in the frame. RA is live, and SP and FP
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// belong to the caller.
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intptr_t* frame_fp = os::Linux::ucontext_get_fp(uc);
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intptr_t* frame_sp = os::Linux::ucontext_get_sp(uc);
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address frame_pc = (address)(uc->uc_mcontext.__gregs[REG_LR]
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- NativeInstruction::instruction_size);
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return frame(frame_sp, frame_fp, frame_pc);
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}
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frame os::fetch_frame_from_context(const void* ucVoid) {
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intptr_t* frame_sp = nullptr;
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intptr_t* frame_fp = nullptr;
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address epc = fetch_frame_from_context(ucVoid, &frame_sp, &frame_fp);
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if (!is_readable_pointer(epc)) {
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// Try to recover from calling into bad memory
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// Assume new frame has not been set up, the same as
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// compiled frame stack bang
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return fetch_compiled_frame_from_context(ucVoid);
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}
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return frame(frame_sp, frame_fp, epc);
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}
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intptr_t* os::fetch_bcp_from_context(const void* ucVoid) {
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assert(ucVoid != nullptr, "invariant");
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const ucontext_t* uc = (const ucontext_t*)ucVoid;
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assert(os::Posix::ucontext_is_interpreter(uc), "invariant");
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return reinterpret_cast<intptr_t*>(uc->uc_mcontext.__gregs[REG_BCP]);
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}
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// By default, gcc always saves frame pointer rfp on this stack. This
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// may get turned off by -fomit-frame-pointer.
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frame os::get_sender_for_C_frame(frame* fr) {
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return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
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}
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NOINLINE frame os::current_frame() {
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intptr_t **sender_sp = (intptr_t **)__builtin_frame_address(0);
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if (sender_sp != nullptr) {
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frame myframe((intptr_t*)os::current_stack_pointer(),
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sender_sp[frame::link_offset],
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CAST_FROM_FN_PTR(address, os::current_frame));
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if (os::is_first_C_frame(&myframe)) {
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// stack is not walkable
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return frame();
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} else {
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return os::get_sender_for_C_frame(&myframe);
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}
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} else {
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ShouldNotReachHere();
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return frame();
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}
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}
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// Utility functions
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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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// decide if this trap can be handled by a stub
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address stub = nullptr;
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address pc = nullptr;
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//%note os_trap_1
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if (info != nullptr && uc != nullptr && thread != nullptr) {
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pc = (address) os::Posix::ucontext_get_pc(uc);
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address addr = (address) info->si_addr;
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// Make sure the high order byte is sign extended, as it may be masked away by the hardware.
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if ((uintptr_t(addr) & (uintptr_t(1) << 55)) != 0) {
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addr = address(uintptr_t(addr) | (uintptr_t(0xFF) << 56));
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}
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// Handle ALL stack overflow variations here
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if (sig == SIGSEGV) {
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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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if (os::Posix::handle_stack_overflow(thread, addr, pc, uc, &stub)) {
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return true; // continue
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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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// Java thread running in Java code => find exception handler if any
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// a fault inside compiled code, the interpreter, or a stub
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if (sig == SIGSEGV && SafepointMechanism::is_poll_address((address)info->si_addr)) {
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stub = SharedRuntime::get_poll_stub(pc);
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} else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) {
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// BugId 4454115: A read from a MappedByteBuffer can fault
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// here if the underlying file has been truncated.
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// Do not crash the VM in such a case.
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CodeBlob* cb = CodeCache::find_blob(pc);
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nmethod* nm = (cb != nullptr) ? cb->as_nmethod_or_null() : nullptr;
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bool is_unsafe_memory_access = (thread->doing_unsafe_access() && UnsafeMemoryAccess::contains_pc(pc));
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if ((nm != nullptr && nm->has_unsafe_access()) || is_unsafe_memory_access) {
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address next_pc = Assembler::locate_next_instruction(pc);
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if (is_unsafe_memory_access) {
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next_pc = UnsafeMemoryAccess::page_error_continue_pc(pc);
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}
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stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
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}
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} else if (sig == SIGILL && nativeInstruction_at(pc)->is_stop()) {
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// Pull a pointer to the error message out of the instruction
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// stream.
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const uint64_t *detail_msg_ptr
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= (uint64_t*)(pc + NativeInstruction::instruction_size);
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const char *detail_msg = (const char *)*detail_msg_ptr;
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const char *msg = "stop";
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if (TraceTraps) {
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tty->print_cr("trap: %s: (SIGILL)", msg);
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}
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// End life with a fatal error, message and detail message and the context.
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// Note: no need to do any post-processing here (e.g. signal chaining)
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VMError::report_and_die(thread, uc, nullptr, 0, msg, "%s", detail_msg);
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ShouldNotReachHere();
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} else if (sig == SIGFPE &&
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(info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) {
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stub =
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SharedRuntime::
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continuation_for_implicit_exception(thread,
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pc,
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SharedRuntime::
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IMPLICIT_DIVIDE_BY_ZERO);
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} else if (sig == SIGSEGV &&
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MacroAssembler::uses_implicit_null_check((void*)addr)) {
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// Determination of interpreter/vtable stub/compiled code null exception
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stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
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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 && /* info->si_code == BUS_OBJERR && */
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thread->doing_unsafe_access()) {
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address next_pc = Assembler::locate_next_instruction(pc);
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if (UnsafeMemoryAccess::contains_pc(pc)) {
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next_pc = UnsafeMemoryAccess::page_error_continue_pc(pc);
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}
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stub = SharedRuntime::handle_unsafe_access(thread, next_pc);
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}
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// jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
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// and the heap gets shrunk before the field access.
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if ((sig == SIGSEGV) || (sig == SIGBUS)) {
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address addr_slow = JNI_FastGetField::find_slowcase_pc(pc);
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if (addr_slow != (address)-1) {
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stub = addr_slow;
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}
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}
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}
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if (stub != nullptr) {
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// save all thread context in case we need to restore it
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if (thread != nullptr) {
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thread->set_saved_exception_pc(pc);
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}
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os::Posix::ucontext_set_pc(uc, stub);
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return true;
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}
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return false; // Mute compiler
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}
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void os::Linux::init_thread_fpu_state(void) {
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}
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int os::Linux::get_fpu_control_word(void) {
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return 0;
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}
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void os::Linux::set_fpu_control_word(int fpu_control) {
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}
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////////////////////////////////////////////////////////////////////////////////
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// thread stack
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// Minimum usable stack sizes required to get to user code. Space for
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// HotSpot guard pages is added later.
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size_t os::_compiler_thread_min_stack_allowed = 72 * K;
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size_t os::_java_thread_min_stack_allowed = 72 * K;
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size_t os::_vm_internal_thread_min_stack_allowed = 72 * K;
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// return default stack size for thr_type
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size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
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// default stack size (compiler thread needs larger stack)
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size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M);
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return s;
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}
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/////////////////////////////////////////////////////////////////////////////
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// helper functions for fatal error handler
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static const char* reg_abi_names[] = {
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"pc",
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"x1(ra)", "x2(sp)", "x3(gp)", "x4(tp)",
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"x5(t0)", "x6(t1)", "x7(t2)",
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"x8(s0)", "x9(s1)",
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"x10(a0)", "x11(a1)", "x12(a2)", "x13(a3)", "x14(a4)", "x15(a5)", "x16(a6)", "x17(a7)",
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"x18(s2)", "x19(s3)", "x20(s4)", "x21(s5)", "x22(s6)", "x23(s7)", "x24(s8)", "x25(s9)", "x26(s10)", "x27(s11)",
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"x28(t3)", "x29(t4)","x30(t5)", "x31(t6)"
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};
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void os::print_context(outputStream *st, const void *context) {
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if (context == nullptr) return;
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const ucontext_t *uc = (const ucontext_t*)context;
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st->print_cr("Registers:");
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for (int r = 0; r < 32; r++) {
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st->print_cr("%-*.*s=" INTPTR_FORMAT, 8, 8, reg_abi_names[r], (uintptr_t)uc->uc_mcontext.__gregs[r]);
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}
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st->cr();
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const struct __riscv_mc_d_ext_state * const f_ext_state = &(uc->uc_mcontext.__fpregs.__d);
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st->print_cr("Floating point state:");
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st->print_cr("fcsr=" UINT32_FORMAT, f_ext_state->__fcsr);
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st->print_cr("Floating point registers:");
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for (int r = 0; r < 32; r++) {
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st->print_cr("f%d=" INTPTR_FORMAT, r, (intptr_t)f_ext_state->__f[r]);
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}
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st->cr();
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#ifdef NO_RVV_SIGCONTEXT
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st->print_cr("Vector state: JVM compiled without vector sigcontext support");
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#else // ifndef NO_RVV_SIGCONTEXT
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// This magic number is not in any user-space header.
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// No other choice but to define it (arch/riscv/include/uapi/asm/sigcontext.h).
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#ifndef RISCV_V_MAGIC
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#define RISCV_V_MAGIC 0x53465457
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#endif
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// Find the vector context
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struct __riscv_extra_ext_header *ext = (struct __riscv_extra_ext_header *)(&uc->uc_mcontext.__fpregs);
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if (ext->hdr.magic != RISCV_V_MAGIC) {
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st->print_cr("Vector state: not found");
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return;
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}
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// The size passed to user-space is calculated accordingly:
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// size = sizeof(struct __riscv_ctx_hdr) + sizeof(struct __riscv_v_ext_state) + riscv_v_vsize;
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uint32_t ext_size = ext->hdr.size;
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if (ext_size < (sizeof(struct __riscv_ctx_hdr) + sizeof(struct __riscv_v_ext_state))) {
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st->print_cr("Vector state: not found, invalid size");
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return;
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}
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struct __riscv_v_ext_state *v_ext_state = (struct __riscv_v_ext_state *)((char *)(ext) + sizeof(struct __riscv_extra_ext_header));
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st->print_cr("Vector state:");
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st->print_cr("vstart=" INTPTR_FORMAT, v_ext_state->vstart);
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st->print_cr("vl =" INTPTR_FORMAT, v_ext_state->vl);
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st->print_cr("vtype =" INTPTR_FORMAT, v_ext_state->vtype);
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st->print_cr("vcsr =" INTPTR_FORMAT, v_ext_state->vcsr);
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st->print_cr("vlenb =" INTPTR_FORMAT, v_ext_state->vlenb);
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st->print_cr("Vector registers:");
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uint64_t vr_size = v_ext_state->vlenb;
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// Registers are after the v extensions header.
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ext_size -= (sizeof(struct __riscv_ctx_hdr) + sizeof(struct __riscv_v_ext_state));
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if (ext_size != (32 * vr_size)) {
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st->print_cr("Vector registers: not found, invalid size");
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return;
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}
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// datap format is undocumented, but is generated by kernel function riscv_v_vstate_save().
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uint8_t *regp = (uint8_t *)v_ext_state->datap;
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for (int r = 0; r < 32; r++) {
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st->print("v%d=0x", r);
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for (int i = vr_size; i > 0; i--) {
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st->print("%02" PRIx8, regp[i-1]);
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}
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st->print_cr("");
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regp += vr_size;
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}
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st->cr();
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#endif // #ifndef NO_RVV_SIGCONTEXT
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}
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void os::print_register_info(outputStream *st, const void *context, int& continuation) {
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const int register_count = 32;
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int n = continuation;
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assert(n >= 0 && n <= register_count, "Invalid continuation value");
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if (context == nullptr || n == register_count) {
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return;
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}
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const ucontext_t *uc = (const ucontext_t*)context;
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while (n < register_count) {
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// Update continuation with next index before printing location
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continuation = n + 1;
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st->print("%-8.8s=", reg_abi_names[n]);
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print_location(st, uc->uc_mcontext.__gregs[n]);
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++n;
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}
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}
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void os::setup_fpu() {
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}
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#ifndef PRODUCT
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void os::verify_stack_alignment() {
|
|
assert(((intptr_t)os::current_stack_pointer() & (StackAlignmentInBytes-1)) == 0, "incorrect stack alignment");
|
|
}
|
|
#endif
|
|
|
|
int os::extra_bang_size_in_bytes() {
|
|
return 0;
|
|
}
|
|
|
|
static inline void atomic_copy64(const volatile void *src, volatile void *dst) {
|
|
*(jlong *) dst = *(const jlong *) src;
|
|
}
|
|
|
|
extern "C" {
|
|
int SpinPause() {
|
|
if (UseZihintpause) {
|
|
// PAUSE is encoded as a FENCE instruction with pred=W, succ=0, fm=0, rd=x0, and rs1=x0.
|
|
// To do: __asm__ volatile("pause " : : : );
|
|
// Since we're currently not passing '-march=..._zihintpause' to the compiler,
|
|
// it will not recognize the "pause" instruction, hence the hard-coded instruction.
|
|
__asm__ volatile(".word 0x0100000f " : : : );
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void _Copy_conjoint_jshorts_atomic(const jshort* from, jshort* to, size_t count) {
|
|
if (from > to) {
|
|
const jshort *end = from + count;
|
|
while (from < end) {
|
|
*(to++) = *(from++);
|
|
}
|
|
} else if (from < to) {
|
|
const jshort *end = from;
|
|
from += count - 1;
|
|
to += count - 1;
|
|
while (from >= end) {
|
|
*(to--) = *(from--);
|
|
}
|
|
}
|
|
}
|
|
void _Copy_conjoint_jints_atomic(const jint* from, jint* to, size_t count) {
|
|
if (from > to) {
|
|
const jint *end = from + count;
|
|
while (from < end) {
|
|
*(to++) = *(from++);
|
|
}
|
|
} else if (from < to) {
|
|
const jint *end = from;
|
|
from += count - 1;
|
|
to += count - 1;
|
|
while (from >= end) {
|
|
*(to--) = *(from--);
|
|
}
|
|
}
|
|
}
|
|
|
|
void _Copy_conjoint_jlongs_atomic(const jlong* from, jlong* to, size_t count) {
|
|
if (from > to) {
|
|
const jlong *end = from + count;
|
|
while (from < end) {
|
|
atomic_copy64(from++, to++);
|
|
}
|
|
} else if (from < to) {
|
|
const jlong *end = from;
|
|
from += count - 1;
|
|
to += count - 1;
|
|
while (from >= end) {
|
|
atomic_copy64(from--, to--);
|
|
}
|
|
}
|
|
}
|
|
|
|
void _Copy_arrayof_conjoint_bytes(const HeapWord* from,
|
|
HeapWord* to,
|
|
size_t count) {
|
|
memmove(to, from, count);
|
|
}
|
|
void _Copy_arrayof_conjoint_jshorts(const HeapWord* from,
|
|
HeapWord* to,
|
|
size_t count) {
|
|
memmove(to, from, count * 2);
|
|
}
|
|
void _Copy_arrayof_conjoint_jints(const HeapWord* from,
|
|
HeapWord* to,
|
|
size_t count) {
|
|
memmove(to, from, count * 4);
|
|
}
|
|
void _Copy_arrayof_conjoint_jlongs(const HeapWord* from,
|
|
HeapWord* to,
|
|
size_t count) {
|
|
memmove(to, from, count * 8);
|
|
}
|
|
};
|