--- /dev/null 2018-09-25 19:25:50.000000000 +0300 +++ new/src/hotspot/os_cpu/linux_aarch32/os_linux_aarch32.cpp 2018-09-25 19:25:49.000000000 +0300 @@ -0,0 +1,699 @@ +/* + * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2014, Red Hat Inc. All rights reserved. + * Copyright (c) 2015, Linaro Ltd. All rights reserved. + * Copyright (c) 2015-2018, Azul Systems, Inc. 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 "jvm.h" +#include "asm/macroAssembler.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 "memory/allocation.inline.hpp" +#include "nativeInst_aarch32.hpp" +#include "os_share_linux.hpp" +#include "prims/jniFastGetField.hpp" +#include "prims/jvm_misc.hpp" +#include "runtime/arguments.hpp" +#include "runtime/extendedPC.hpp" +#include "runtime/frame.inline.hpp" +#include "runtime/interfaceSupport.inline.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/thread.inline.hpp" +#include "runtime/timer.hpp" +#include "utilities/debug.hpp" +#include "utilities/events.hpp" +#include "utilities/vmError.hpp" + +// put OS-includes here +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include +# include + +#define SPELL_REG_SP "sp" +#define SPELL_REG_FP "fp" + +extern "C" { + void *linux_aarch32_current_frame_pointer(); + void *linux_aarch32_previous_frame_pointer(); +} + +address os::current_stack_pointer() { + return (address) linux_aarch32_current_frame_pointer(); +} + +char* os::non_memory_address_word() { + // Must never look like an address returned by reserve_memory, + // even in its subfields (as defined by the CPU immediate fields, + // if the CPU splits constants across multiple instructions). + + return (char*) 0xfffffffful; +} + +void os::initialize_thread(Thread *thr) { +} + +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 = (intptr_t)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; +} + +// 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; + ucontext_t* uc = (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) *ret_fp = os::Linux::ucontext_get_fp(uc); + } 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()); +} + +bool os::Linux::get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr) { + address pc = (address) os::Linux::ucontext_get_pc(uc); + if (Interpreter::contains(pc)) { + // interpreter performs stack banging after the fixed frame header has + // been generated while the compilers perform it before. To maintain + // semantic consistency between interpreted and compiled frames, the + // method returns the Java sender of the current frame. + *fr = os::fetch_frame_from_context(uc); + if (!fr->is_first_java_frame()) { + assert(fr->safe_for_sender(thread), "Safety check"); + *fr = fr->java_sender(); + } + } else { + // more complex code with compiled code + assert(!Interpreter::contains(pc), "Interpreted methods should have been handled above"); + CodeBlob* cb = CodeCache::find_blob(pc); + if (cb == NULL || !cb->is_nmethod() || cb->is_frame_complete_at(pc)) { + // Not sure where the pc points to, fallback to default + // stack overflow handling + return false; + } else { + // In compiled code, the stack banging is performed before LR + // has been saved in the frame. LR is live, and SP and FP + // belong to the caller. + intptr_t* fp = os::Linux::ucontext_get_fp(uc); + intptr_t* sp = os::Linux::ucontext_get_sp(uc); + //TODO: XXX: Merge + // could be pc = os::Linux::ucontext_get_pc(uc) ? + address pc = (address)(uc->uc_mcontext.arm_lr + - NativeInstruction::arm_insn_sz); + *fr = frame(sp, fp, pc); + if (!fr->is_java_frame()) { + assert(fr->safe_for_sender(thread), "Safety check"); + assert(!fr->is_first_frame(), "Safety check"); + *fr = fr->java_sender(); + } + } + } + assert(fr->is_java_frame(), "Safety check"); + return true; +} + +// By default, gcc always saves frame pointer rfp on this stack. This +// may get turned off by -fomit-frame-pointer. +frame os::get_sender_for_C_frame(frame* fr) { +#ifdef __thumb__ + return frame(); +#else + address sender_pc = *(address*) fr->addr_at(fr->get_return_addr_offset(JNIFrameAPCS)); + intptr_t* link = *(intptr_t**) fr->addr_at(fr->get_link_offset(JNIFrameAPCS)); + return frame(fr->sender_sp(), link, sender_pc); +#endif +} + +frame os::current_frame() { +#ifdef __thumb__ + return frame(); +#else + intptr_t* fp = (intptr_t*)linux_aarch32_previous_frame_pointer(); + frame myframe((intptr_t*)os::current_stack_pointer(), + (intptr_t*)fp, + CAST_FROM_FN_PTR(address, os::current_frame)); + // check for C2 frame first, those to not have valid FP + if (!CodeCache::find_blob( + *(address*)myframe.addr_at(myframe.get_return_addr_offset(JNIFrameAPCS))) && + os::is_first_C_frame(&myframe)) { + // stack is not walkable + return frame(); + } else { + return os::get_sender_for_C_frame(&myframe); + } +#endif +} + +// Utility functions + +// From IA32 System Programming Guide +enum { + trap_page_fault = 0xE +}; + +// An operation in Unsafe has faulted. We're going to return to the +// instruction after the faulting load or store. We also set +// pending_unsafe_access_error so that at some point in the future our +// user will get a helpful message. +static address handle_unsafe_access(JavaThread* thread, address pc) { + // pc is the instruction which we must emulate + // doing a no-op is fine: return garbage from the load + // therefore, compute npc + address npc = pc + NativeInstruction::arm_insn_sz; + + // request an async exception + thread->set_pending_unsafe_access_error(); + + // return address of next instruction to execute + return npc; +} + +extern "C" JNIEXPORT 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); + + // 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 { + if (PrintMiscellaneous && (WizardMode || Verbose)) { + char buf[64]; + warning("Ignoring %s - see bugs 4229104 or 646499219", + os::exception_name(sig, buf, sizeof(buf))); + } + return true; + } + } + +#ifdef CAN_SHOW_REGISTERS_ON_ASSERT + if ((sig == SIGSEGV || sig == SIGBUS) && info != NULL && info->si_addr == g_assert_poison) { + handle_assert_poison_fault(ucVoid, info->si_addr); + return 1; + } +#endif + + 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; + } + } + } +/* + NOTE: does not seem to work on linux. + if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { + // can't decode this kind of signal + info = NULL; + } else { + assert(sig == info->si_signo, "bad siginfo"); + } +*/ + // decide if this trap can be handled by a stub + address stub = NULL; + + address pc = NULL; + + //%note os_trap_1 + if (info != NULL && uc != NULL && thread != NULL) { + pc = (address) os::Linux::ucontext_get_pc(uc); + + if (StubRoutines::is_safefetch_fault(pc)) { + os::Linux::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc)); + return 1; + } + + // Handle ALL stack overflow variations here + if (sig == SIGSEGV) { + address addr = (address) info->si_addr; + + // check if fault address is within thread stack + if (thread->on_local_stack(addr)) { + // stack overflow + if (thread->in_stack_yellow_reserved_zone(addr)) { + thread->disable_stack_yellow_reserved_zone(); + if (thread->thread_state() == _thread_in_Java) { + if (thread->in_stack_reserved_zone(addr)) { + frame fr; + if (os::Linux::get_frame_at_stack_banging_point(thread, uc, &fr)) { + assert(fr.is_java_frame(), "Must be a Java frame"); + frame activation = + SharedRuntime::look_for_reserved_stack_annotated_method(thread, fr); + if (activation.sp() != NULL) { + thread->disable_stack_reserved_zone(); + if (activation.is_interpreted_frame()) { + thread->set_reserved_stack_activation((address)( + activation.fp() + frame::interpreter_frame_initial_sp_offset)); + } else { + thread->set_reserved_stack_activation((address)activation.unextended_sp()); + } + return 1; + } + } + } + // 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."); + + // This is a likely cause, but hard to verify. Let's just print + // it as a hint. + tty->print_raw_cr("Please check if any of your loaded .so files has " + "enabled executable stack (see man page execstack(8))"); + } 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 + + // Handle signal from NativeJump::patch_verified_entry(). + if ((sig == SIGILL || sig == SIGTRAP) + && nativeInstruction_at(pc)->is_sigill_zombie_not_entrant()) { + if (TraceTraps) { + tty->print_cr("trap: zombie_not_entrant (%s)", (sig == SIGTRAP) ? "SIGTRAP" : "SIGILL"); + } + stub = SharedRuntime::get_handle_wrong_method_stub(); + } else if (sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) { + stub = SharedRuntime::get_poll_stub(pc); + } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { + // 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()) { + stub = handle_unsafe_access(thread, pc); + } + } + else + + if (sig == SIGFPE && + (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { + stub = + SharedRuntime:: + continuation_for_implicit_exception(thread, + pc, + SharedRuntime:: + IMPLICIT_DIVIDE_BY_ZERO); + } else if (sig == SIGSEGV && + !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { + // Determination of interpreter/vtable stub/compiled code null exception + stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); + } + } else if (sig == SIGILL && VM_Version::is_determine_features_test_running()) { + // SIGILL must be caused by VM_Version::get_processor_features(). + *(int *)pc = Assembler::nop_insn; // patch instruction to NOP to indicate that it causes a SIGILL, + // flushing of icache is not necessary. + stub = pc + 4; // continue with next instruction. + } else if (thread->thread_state() == _thread_in_vm && + sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ + thread->doing_unsafe_access()) { + stub = handle_unsafe_access(thread, pc); + } + + // jni_fast_GetField can trap at certain pc's if a GC kicks in + // and the heap gets shrunk before the field access. + if ((sig == SIGSEGV) || (sig == SIGBUS)) { + address addr = JNI_FastGetField::find_slowcase_pc(pc); + if (addr != (address)-1) { + stub = addr; + } + } + + // Check to see if we caught the safepoint code in the + // process of write protecting the memory serialization page. + // It write enables the page immediately after protecting it + // so we can just return to retry the write. + if ((sig == SIGSEGV) && + os::is_memory_serialize_page(thread, (address) info->si_addr)) { + // Block current thread until the memory serialize page permission restored. + os::block_on_serialize_page_trap(); + return true; + } + } + + if (stub != NULL) { + // 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 true; // Mute compiler +} + +void os::Linux::init_thread_fpu_state(void) { +} + +int os::Linux::get_fpu_control_word(void) { + return 0; +} + +void os::Linux::set_fpu_control_word(int fpu_control) { +} + +// Check that the linux kernel version is 2.4 or higher since earlier +// versions do not support SSE without patches. +bool os::supports_sse() { + return true; +} + +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; +} + +// Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ JavaThread created by VM does not have glibc +// | glibc guard page | - guard, attached Java thread usually has +// | |/ 1 page glibc guard. +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | HotSpot Guard Pages | - red and yellow pages +// | |/ +// +------------------------+ JavaThread::stack_yellow_zone_base() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// Non-Java thread: +// +// Low memory addresses +// +------------------------+ +// | |\ +// | glibc guard page | - usually 1 page +// | |/ +// P1 +------------------------+ Thread::stack_base() - Thread::stack_size() +// | |\ +// | Normal Stack | - +// | |/ +// P2 +------------------------+ Thread::stack_base() +// +// ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from +// pthread_attr_getstack() + +///////////////////////////////////////////////////////////////////////////// +// helper functions for fatal error handler + + +void os::print_context(outputStream *st, const void *context) { + if (context == NULL) return; + + ucontext_t *uc = (ucontext_t*)context; + st->print_cr("Registers:"); + + for (int r = 0; r < 16; r++) + st->print_cr( "R%d=" INTPTR_FORMAT, r, *((unsigned int*)&uc->uc_mcontext.arm_r0 + r) ); + + st->cr(); + + intptr_t *sp = (intptr_t *)os::Linux::ucontext_get_sp(uc); + st->print_cr("Top of Stack: (sp=" PTR_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=" PTR_FORMAT ")", p2i(pc)); + print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); +} + +void os::print_register_info(outputStream *st, const void *context) { + if (context == NULL) return; + + ucontext_t *uc = (ucontext_t*)context; + + st->print_cr("Register to memory mapping:"); + st->cr(); + + for (int r = 0; r < 16; r++) { + st->print( "R%d=", r); print_location(st, *((unsigned int*)&uc->uc_mcontext.arm_r0 + r)); + } + st->cr(); +} + +void os::setup_fpu() { +} + +#ifndef PRODUCT +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() { + // AArch64 does not require the additional stack bang. + // does AArch32? + return 0; +} + +extern "C" { + int SpinPause() { + return 0; + } + + void _Copy_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) { + if (from > to) { + jshort *end = from + count; + while (from < end) + *(to++) = *(from++); + } + else if (from < to) { + jshort *end = from; + from += count - 1; + to += count - 1; + while (from >= end) + *(to--) = *(from--); + } + } + void _Copy_conjoint_jints_atomic(jint* from, jint* to, size_t count) { + if (from > to) { + jint *end = from + count; + while (from < end) + *(to++) = *(from++); + } + else if (from < to) { + jint *end = from; + from += count - 1; + to += count - 1; + while (from >= end) + *(to--) = *(from--); + } + } + void _Copy_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) { + if (from > to) { + jlong *end = from + count; + while (from < end) + os::atomic_copy64(from++, to++); + } + else if (from < to) { + jlong *end = from; + from += count - 1; + to += count - 1; + while (from >= end) + os::atomic_copy64(from--, to--); + } + } + + void _Copy_arrayof_conjoint_bytes(HeapWord* from, + HeapWord* to, + size_t count) { + memmove(to, from, count); + } + void _Copy_arrayof_conjoint_jshorts(HeapWord* from, + HeapWord* to, + size_t count) { + memmove(to, from, count * 2); + } + void _Copy_arrayof_conjoint_jints(HeapWord* from, + HeapWord* to, + size_t count) { + memmove(to, from, count * 4); + } + void _Copy_arrayof_conjoint_jlongs(HeapWord* from, + HeapWord* to, + size_t count) { + memmove(to, from, count * 8); + } +};