| /* |
| * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved. |
| * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc. |
| * 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_zero.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 "mutex_linux.inline.hpp" |
| #include "nativeInst_zero.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/thread.inline.hpp" |
| #include "runtime/timer.hpp" |
| #include "utilities/events.hpp" |
| #include "utilities/vmError.hpp" |
| |
| // See stubGenerator_zero.cpp |
| #include <setjmp.h> |
| extern sigjmp_buf* get_jmp_buf_for_continuation(); |
| |
| address os::current_stack_pointer() { |
| // return the address of the current function |
| return (address)__builtin_frame_address(0); |
| } |
| |
| frame os::get_sender_for_C_frame(frame* fr) { |
| ShouldNotCallThis(); |
| return frame(NULL, NULL); // silence compile warning. |
| } |
| |
| frame os::current_frame() { |
| // The only thing that calls this is the stack printing code in |
| // VMError::report: |
| // - Step 110 (printing stack bounds) uses the sp in the frame |
| // to determine the amount of free space on the stack. We |
| // set the sp to a close approximation of the real value in |
| // order to allow this step to complete. |
| // - Step 120 (printing native stack) tries to walk the stack. |
| // The frame we create has a NULL pc, which is ignored as an |
| // invalid frame. |
| frame dummy = frame(); |
| dummy.set_sp((intptr_t *) current_stack_pointer()); |
| return dummy; |
| } |
| |
| 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). |
| #ifdef SPARC |
| // On SPARC, 0 != %hi(any real address), because there is no |
| // allocation in the first 1Kb of the virtual address space. |
| return (char *) 0; |
| #else |
| // This is the value for x86; works pretty well for PPC too. |
| return (char *) -1; |
| #endif // SPARC |
| } |
| |
| void os::initialize_thread(Thread * thr){ |
| // Nothing to do. |
| } |
| |
| address os::Linux::ucontext_get_pc(const ucontext_t* uc) { |
| ShouldNotCallThis(); |
| return NULL; // silence compile warnings |
| } |
| |
| void os::Linux::ucontext_set_pc(ucontext_t * uc, address pc) { |
| ShouldNotCallThis(); |
| } |
| |
| ExtendedPC os::fetch_frame_from_context(const void* ucVoid, |
| intptr_t** ret_sp, |
| intptr_t** ret_fp) { |
| ShouldNotCallThis(); |
| return NULL; // silence compile warnings |
| } |
| |
| frame os::fetch_frame_from_context(const void* ucVoid) { |
| ShouldNotCallThis(); |
| return frame(NULL, NULL); // silence compile warnings |
| } |
| |
| 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(); |
| |
| SignalHandlerMark shm(t); |
| |
| // handle SafeFetch faults |
| if (sig == SIGSEGV || sig == SIGBUS) { |
| sigjmp_buf* const pjb = get_jmp_buf_for_continuation(); |
| if (pjb) { |
| siglongjmp(*pjb, 1); |
| } |
| } |
| |
| // 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; |
| } |
| } |
| |
| 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; |
| } |
| } |
| } |
| |
| if (info != NULL && thread != NULL) { |
| // 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(); |
| ShouldNotCallThis(); |
| } |
| else if (thread->in_stack_red_zone(addr)) { |
| thread->disable_stack_red_zone(); |
| ShouldNotCallThis(); |
| } |
| 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 true; |
| } |
| thread->osthread()->clear_expanding_stack(); |
| } |
| else { |
| fatal("recursive segv. expanding stack."); |
| } |
| } |
| } |
| } |
| |
| /*if (thread->thread_state() == _thread_in_Java) { |
| ShouldNotCallThis(); |
| } |
| else*/ if (thread->thread_state() == _thread_in_vm && |
| sig == SIGBUS && thread->doing_unsafe_access()) { |
| ShouldNotCallThis(); |
| } |
| |
| // 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 permission is restored. |
| os::block_on_serialize_page_trap(); |
| 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; |
| } |
| |
| #ifndef PRODUCT |
| if (sig == SIGSEGV) { |
| fatal("\n#" |
| "\n# /--------------------\\" |
| "\n# | segmentation fault |" |
| "\n# \\---\\ /--------------/" |
| "\n# /" |
| "\n# [-] |\\_/| " |
| "\n# (+)=C |o o|__ " |
| "\n# | | =-*-=__\\ " |
| "\n# OOO c_c_(___)"); |
| } |
| #endif // !PRODUCT |
| |
| char buf[64]; |
| |
| sprintf(buf, "caught unhandled signal %d", sig); |
| |
| // Silence -Wformat-security warning for fatal() |
| PRAGMA_DIAG_PUSH |
| PRAGMA_FORMAT_NONLITERAL_IGNORED |
| fatal(buf); |
| PRAGMA_DIAG_POP |
| return true; // silence compiler warnings |
| } |
| |
| void os::Linux::init_thread_fpu_state(void) { |
| // Nothing to do |
| } |
| |
| int os::Linux::get_fpu_control_word() { |
| ShouldNotCallThis(); |
| return -1; // silence compile warnings |
| } |
| |
| void os::Linux::set_fpu_control_word(int fpu) { |
| ShouldNotCallThis(); |
| } |
| |
| bool os::is_allocatable(size_t bytes) { |
| #ifdef _LP64 |
| return true; |
| #else |
| if (bytes < 2 * G) { |
| return true; |
| } |
| |
| char* addr = reserve_memory(bytes, NULL); |
| |
| if (addr != NULL) { |
| release_memory(addr, bytes); |
| } |
| |
| return addr != NULL; |
| #endif // _LP64 |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // thread stack |
| |
| size_t os::Linux::min_stack_allowed = 64 * K; |
| |
| size_t os::Linux::default_stack_size(os::ThreadType thr_type) { |
| #ifdef _LP64 |
| size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); |
| #else |
| size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); |
| #endif // _LP64 |
| return s; |
| } |
| |
| size_t os::Linux::default_guard_size(os::ThreadType thr_type) { |
| // Only enable glibc guard pages for non-Java threads |
| // (Java threads have HotSpot guard pages) |
| return (thr_type == java_thread ? 0 : page_size()); |
| } |
| |
| static void current_stack_region(address *bottom, size_t *size) { |
| pthread_attr_t attr; |
| int res = pthread_getattr_np(pthread_self(), &attr); |
| if (res != 0) { |
| if (res == ENOMEM) { |
| vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "pthread_getattr_np"); |
| } |
| else { |
| fatal("pthread_getattr_np failed with errno = %d", res); |
| } |
| } |
| |
| address stack_bottom; |
| size_t stack_bytes; |
| res = pthread_attr_getstack(&attr, (void **) &stack_bottom, &stack_bytes); |
| if (res != 0) { |
| fatal("pthread_attr_getstack failed with errno = %d", res); |
| } |
| address stack_top = stack_bottom + stack_bytes; |
| |
| // The block of memory returned by pthread_attr_getstack() includes |
| // guard pages where present. We need to trim these off. |
| size_t page_bytes = os::Linux::page_size(); |
| assert(((intptr_t) stack_bottom & (page_bytes - 1)) == 0, "unaligned stack"); |
| |
| size_t guard_bytes; |
| res = pthread_attr_getguardsize(&attr, &guard_bytes); |
| if (res != 0) { |
| fatal("pthread_attr_getguardsize failed with errno = %d", res); |
| } |
| int guard_pages = align_size_up(guard_bytes, page_bytes) / page_bytes; |
| assert(guard_bytes == guard_pages * page_bytes, "unaligned guard"); |
| |
| #ifdef IA64 |
| // IA64 has two stacks sharing the same area of memory, a normal |
| // stack growing downwards and a register stack growing upwards. |
| // Guard pages, if present, are in the centre. This code splits |
| // the stack in two even without guard pages, though in theory |
| // there's nothing to stop us allocating more to the normal stack |
| // or more to the register stack if one or the other were found |
| // to grow faster. |
| int total_pages = align_size_down(stack_bytes, page_bytes) / page_bytes; |
| stack_bottom += (total_pages - guard_pages) / 2 * page_bytes; |
| #endif // IA64 |
| |
| stack_bottom += guard_bytes; |
| |
| pthread_attr_destroy(&attr); |
| |
| // The initial thread has a growable stack, and the size reported |
| // by pthread_attr_getstack is the maximum size it could possibly |
| // be given what currently mapped. This can be huge, so we cap it. |
| if (os::Linux::is_initial_thread()) { |
| stack_bytes = stack_top - stack_bottom; |
| |
| if (stack_bytes > JavaThread::stack_size_at_create()) |
| stack_bytes = JavaThread::stack_size_at_create(); |
| |
| stack_bottom = stack_top - stack_bytes; |
| } |
| |
| assert(os::current_stack_pointer() >= stack_bottom, "should do"); |
| assert(os::current_stack_pointer() < stack_top, "should do"); |
| |
| *bottom = stack_bottom; |
| *size = stack_top - stack_bottom; |
| } |
| |
| address os::current_stack_base() { |
| address bottom; |
| size_t size; |
| current_stack_region(&bottom, &size); |
| return bottom + size; |
| } |
| |
| size_t os::current_stack_size() { |
| // stack size includes normal stack and HotSpot guard pages |
| address bottom; |
| size_t size; |
| current_stack_region(&bottom, &size); |
| return size; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // helper functions for fatal error handler |
| |
| void os::print_context(outputStream* st, const void* context) { |
| ShouldNotCallThis(); |
| } |
| |
| void os::print_register_info(outputStream *st, const void *context) { |
| ShouldNotCallThis(); |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // Stubs for things that would be in linux_zero.s if it existed. |
| // You probably want to disassemble these monkeys to check they're ok. |
| |
| extern "C" { |
| int SpinPause() { |
| return -1; // silence compile warnings |
| } |
| |
| |
| 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); |
| } |
| }; |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| // Implementations of atomic operations not supported by processors. |
| // -- http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Atomic-Builtins.html |
| |
| #ifndef _LP64 |
| extern "C" { |
| long long unsigned int __sync_val_compare_and_swap_8( |
| volatile void *ptr, |
| long long unsigned int oldval, |
| long long unsigned int newval) { |
| ShouldNotCallThis(); |
| } |
| }; |
| #endif // !_LP64 |
| |
| #ifndef PRODUCT |
| void os::verify_stack_alignment() { |
| } |
| #endif |
| |
| int os::extra_bang_size_in_bytes() { |
| // Zero does not require an additional stack banging. |
| return 0; |
| } |