/* * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved. * Copyright 2007, 2008, 2010, 2015 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. * */ #include "precompiled.hpp" #include "asm/assembler.hpp" #include "assembler_zero.inline.hpp" #include "interpreter/interpreter.hpp" #include "nativeInst_zero.hpp" #include "oops/instanceOop.hpp" #include "oops/method.hpp" #include "oops/objArrayKlass.hpp" #include "oops/oop.inline.hpp" #include "prims/methodHandles.hpp" #include "runtime/frame.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/stubCodeGenerator.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/thread.inline.hpp" #include "stack_zero.inline.hpp" #ifdef COMPILER2 #include "opto/runtime.hpp" #endif // For SafeFetch we need POSIX tls and setjmp #include #include static pthread_key_t g_jmpbuf_key; // return the currently active jump buffer for this thread // - if there is any, NULL otherwise. Called from // zero signal handlers. extern sigjmp_buf* get_jmp_buf_for_continuation() { return (sigjmp_buf*) pthread_getspecific(g_jmpbuf_key); } // Declaration and definition of StubGenerator (no .hpp file). // For a more detailed description of the stub routine structure // see the comment in stubRoutines.hpp class StubGenerator: public StubCodeGenerator { private: // The call stub is used to call Java from C static void call_stub( JavaCallWrapper *call_wrapper, intptr_t* result, BasicType result_type, Method* method, address entry_point, intptr_t* parameters, int parameter_words, TRAPS) { JavaThread *thread = (JavaThread *) THREAD; ZeroStack *stack = thread->zero_stack(); // Make sure we have no pending exceptions assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception"); // Set up the stack if necessary bool stack_needs_teardown = false; if (stack->needs_setup()) { size_t zero_stack_size = stack->suggest_size(thread); stack->setup(alloca(zero_stack_size), zero_stack_size); stack_needs_teardown = true; } // Allocate and initialize our frame EntryFrame *frame = EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD); if (!HAS_PENDING_EXCEPTION) { // Push the frame thread->push_zero_frame(frame); // Make the call Interpreter::invoke_method(method, entry_point, THREAD); // Store the result if (!HAS_PENDING_EXCEPTION) { switch (result_type) { case T_INT: *(jint *) result = *(jint *) stack->sp(); break; case T_LONG: *(jlong *) result = *(jlong *) stack->sp(); break; case T_FLOAT: *(jfloat *) result = *(jfloat *) stack->sp(); break; case T_DOUBLE: *(jdouble *) result = *(jdouble *) stack->sp(); break; case T_OBJECT: *(oop *) result = *(oop *) stack->sp(); break; default: ShouldNotReachHere(); } } // Unwind the frame thread->pop_zero_frame(); } // Tear down the stack if necessary if (stack_needs_teardown) stack->teardown(); } // These stubs get called from some dumb test routine. // I'll write them properly when they're called from // something that's actually doing something. static void fake_arraycopy_stub(address src, address dst, int count) { assert(count == 0, "huh?"); } void generate_arraycopy_stubs() { // Call the conjoint generation methods immediately after // the disjoint ones so that short branches from the former // to the latter can be generated. StubRoutines::_jbyte_disjoint_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jbyte_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jshort_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jint_disjoint_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jint_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jlong_disjoint_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_jlong_arraycopy = (address) fake_arraycopy_stub; StubRoutines::_oop_disjoint_arraycopy = ShouldNotCallThisStub(); StubRoutines::_oop_arraycopy = ShouldNotCallThisStub(); StubRoutines::_checkcast_arraycopy = ShouldNotCallThisStub(); StubRoutines::_unsafe_arraycopy = ShouldNotCallThisStub(); StubRoutines::_generic_arraycopy = ShouldNotCallThisStub(); // We don't generate specialized code for HeapWord-aligned source // arrays, so just use the code we've already generated StubRoutines::_arrayof_jbyte_disjoint_arraycopy = StubRoutines::_jbyte_disjoint_arraycopy; StubRoutines::_arrayof_jbyte_arraycopy = StubRoutines::_jbyte_arraycopy; StubRoutines::_arrayof_jshort_disjoint_arraycopy = StubRoutines::_jshort_disjoint_arraycopy; StubRoutines::_arrayof_jshort_arraycopy = StubRoutines::_jshort_arraycopy; StubRoutines::_arrayof_jint_disjoint_arraycopy = StubRoutines::_jint_disjoint_arraycopy; StubRoutines::_arrayof_jint_arraycopy = StubRoutines::_jint_arraycopy; StubRoutines::_arrayof_jlong_disjoint_arraycopy = StubRoutines::_jlong_disjoint_arraycopy; StubRoutines::_arrayof_jlong_arraycopy = StubRoutines::_jlong_arraycopy; StubRoutines::_arrayof_oop_disjoint_arraycopy = StubRoutines::_oop_disjoint_arraycopy; StubRoutines::_arrayof_oop_arraycopy = StubRoutines::_oop_arraycopy; } static int SafeFetch32(int *adr, int errValue) { // set up a jump buffer; anchor the pointer to the jump buffer in tls; then // do the pointer access. If pointer is invalid, we crash; in signal // handler, we retrieve pointer to jmp buffer from tls, and jump back. // // Note: the jump buffer itself - which can get pretty large depending on // the architecture - lives on the stack and that is fine, because we will // not rewind the stack: either we crash, in which case signal handler // frame is below us, or we don't crash, in which case it does not matter. sigjmp_buf jb; if (sigsetjmp(jb, 1)) { // we crashed. clean up tls and return default value. pthread_setspecific(g_jmpbuf_key, NULL); return errValue; } else { // preparation phase pthread_setspecific(g_jmpbuf_key, &jb); } int value = errValue; value = *adr; // all went well. clean tls. pthread_setspecific(g_jmpbuf_key, NULL); return value; } static intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) { sigjmp_buf jb; if (sigsetjmp(jb, 1)) { // we crashed. clean up tls and return default value. pthread_setspecific(g_jmpbuf_key, NULL); return errValue; } else { // preparation phase pthread_setspecific(g_jmpbuf_key, &jb); } intptr_t value = errValue; value = *adr; // all went well. clean tls. pthread_setspecific(g_jmpbuf_key, NULL); return value; } void generate_initial() { // Generates all stubs and initializes the entry points // entry points that exist in all platforms Note: This is code // that could be shared among different platforms - however the // benefit seems to be smaller than the disadvantage of having a // much more complicated generator structure. See also comment in // stubRoutines.hpp. StubRoutines::_forward_exception_entry = ShouldNotCallThisStub(); StubRoutines::_call_stub_entry = (address) call_stub; StubRoutines::_catch_exception_entry = ShouldNotCallThisStub(); // atomic calls StubRoutines::_atomic_xchg_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_xchg_long_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_cmpxchg_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_cmpxchg_byte_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_add_entry = ShouldNotCallThisStub(); StubRoutines::_atomic_add_long_entry = ShouldNotCallThisStub(); StubRoutines::_fence_entry = ShouldNotCallThisStub(); } void generate_all() { // Generates all stubs and initializes the entry points // These entry points require SharedInfo::stack0 to be set up in // non-core builds and need to be relocatable, so they each // fabricate a RuntimeStub internally. StubRoutines::_throw_AbstractMethodError_entry = ShouldNotCallThisStub(); StubRoutines::_throw_NullPointerException_at_call_entry = ShouldNotCallThisStub(); StubRoutines::_throw_StackOverflowError_entry = ShouldNotCallThisStub(); // support for verify_oop (must happen after universe_init) StubRoutines::_verify_oop_subroutine_entry = ShouldNotCallThisStub(); // arraycopy stubs used by compilers generate_arraycopy_stubs(); // Safefetch stubs. pthread_key_create(&g_jmpbuf_key, NULL); StubRoutines::_safefetch32_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetch32); StubRoutines::_safefetch32_fault_pc = NULL; StubRoutines::_safefetch32_continuation_pc = NULL; StubRoutines::_safefetchN_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetchN); StubRoutines::_safefetchN_fault_pc = NULL; StubRoutines::_safefetchN_continuation_pc = NULL; } public: StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) { if (all) { generate_all(); } else { generate_initial(); } } }; void StubGenerator_generate(CodeBuffer* code, bool all) { StubGenerator g(code, all); } EntryFrame *EntryFrame::build(const intptr_t* parameters, int parameter_words, JavaCallWrapper* call_wrapper, TRAPS) { ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack(); stack->overflow_check(header_words + parameter_words, CHECK_NULL); stack->push(0); // next_frame, filled in later intptr_t *fp = stack->sp(); assert(fp - stack->sp() == next_frame_off, "should be"); stack->push(ENTRY_FRAME); assert(fp - stack->sp() == frame_type_off, "should be"); stack->push((intptr_t) call_wrapper); assert(fp - stack->sp() == call_wrapper_off, "should be"); for (int i = 0; i < parameter_words; i++) stack->push(parameters[i]); return (EntryFrame *) fp; }