| /* |
| * Copyright (c) 1998, 2011, Oracle and/or its affiliates. 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. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #ifdef COMPILER2 |
| #include "asm/macroAssembler.hpp" |
| #include "asm/macroAssembler.inline.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "code/vmreg.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "opto/runtime.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/sharedRuntime.hpp" |
| #include "runtime/stubRoutines.hpp" |
| #include "runtime/vframeArray.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| #include "vmreg_x86.inline.hpp" |
| #endif |
| |
| |
| #define __ masm-> |
| |
| //------------------------------generate_exception_blob--------------------------- |
| // creates exception blob at the end |
| // Using exception blob, this code is jumped from a compiled method. |
| // |
| // Given an exception pc at a call we call into the runtime for the |
| // handler in this method. This handler might merely restore state |
| // (i.e. callee save registers) unwind the frame and jump to the |
| // exception handler for the nmethod if there is no Java level handler |
| // for the nmethod. |
| // |
| // This code is entered with a jmp. |
| // |
| // Arguments: |
| // rax: exception oop |
| // rdx: exception pc |
| // |
| // Results: |
| // rax: exception oop |
| // rdx: exception pc in caller or ??? |
| // destination: exception handler of caller |
| // |
| // Note: the exception pc MUST be at a call (precise debug information) |
| // Only register rax, rdx, rcx are not callee saved. |
| // |
| |
| void OptoRuntime::generate_exception_blob() { |
| |
| // Capture info about frame layout |
| enum layout { |
| thread_off, // last_java_sp |
| // The frame sender code expects that rbp will be in the "natural" place and |
| // will override any oopMap setting for it. We must therefore force the layout |
| // so that it agrees with the frame sender code. |
| rbp_off, |
| return_off, // slot for return address |
| framesize |
| }; |
| |
| // allocate space for the code |
| ResourceMark rm; |
| // setup code generation tools |
| CodeBuffer buffer("exception_blob", 512, 512); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| OopMapSet *oop_maps = new OopMapSet(); |
| |
| address start = __ pc(); |
| |
| __ push(rdx); |
| __ subptr(rsp, return_off * wordSize); // Prolog! |
| |
| // rbp, location is implicitly known |
| __ movptr(Address(rsp,rbp_off *wordSize), rbp); |
| |
| // Store exception in Thread object. We cannot pass any arguments to the |
| // handle_exception call, since we do not want to make any assumption |
| // about the size of the frame where the exception happened in. |
| __ get_thread(rcx); |
| __ movptr(Address(rcx, JavaThread::exception_oop_offset()), rax); |
| __ movptr(Address(rcx, JavaThread::exception_pc_offset()), rdx); |
| |
| // This call does all the hard work. It checks if an exception handler |
| // exists in the method. |
| // If so, it returns the handler address. |
| // If not, it prepares for stack-unwinding, restoring the callee-save |
| // registers of the frame being removed. |
| // |
| __ movptr(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument |
| __ set_last_Java_frame(rcx, noreg, noreg, NULL); |
| |
| __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C))); |
| |
| // No registers to map, rbp is known implicitly |
| oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 )); |
| __ get_thread(rcx); |
| __ reset_last_Java_frame(rcx, false); |
| |
| // Restore callee-saved registers |
| __ movptr(rbp, Address(rsp, rbp_off * wordSize)); |
| |
| __ addptr(rsp, return_off * wordSize); // Epilog! |
| __ pop(rdx); // Exception pc |
| |
| // rax: exception handler for given <exception oop/exception pc> |
| |
| // We have a handler in rax, (could be deopt blob) |
| // rdx - throwing pc, deopt blob will need it. |
| |
| __ push(rax); |
| |
| // Get the exception |
| __ movptr(rax, Address(rcx, JavaThread::exception_oop_offset())); |
| // Get the exception pc in case we are deoptimized |
| __ movptr(rdx, Address(rcx, JavaThread::exception_pc_offset())); |
| #ifdef ASSERT |
| __ movptr(Address(rcx, JavaThread::exception_handler_pc_offset()), NULL_WORD); |
| __ movptr(Address(rcx, JavaThread::exception_pc_offset()), NULL_WORD); |
| #endif |
| // Clear the exception oop so GC no longer processes it as a root. |
| __ movptr(Address(rcx, JavaThread::exception_oop_offset()), NULL_WORD); |
| |
| __ pop(rcx); |
| |
| // rax: exception oop |
| // rcx: exception handler |
| // rdx: exception pc |
| __ jmp (rcx); |
| |
| // ------------- |
| // make sure all code is generated |
| masm->flush(); |
| |
| _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize); |
| } |