| /* |
| * Copyright (c) 2008, 2016, 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/assembler.hpp" |
| #include "assembler_arm.inline.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "code/vmreg.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "nativeInst_arm.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_arm.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. |
| // (see emit_exception_handler in sparc.ad file) |
| // |
| // 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: |
| // Rexception_obj (R4/R19): exception oop |
| // Rexception_pc (R5/R20): exception pc |
| // |
| // Results: |
| // Rexception_obj (R4/R19): exception oop |
| // O1: exception pc in caller or ??? |
| // destination: exception handler of caller |
| // |
| // Note: the exception pc MUST be at a call (precise debug information) |
| // |
| void OptoRuntime::generate_exception_blob() { |
| // allocate space for code |
| ResourceMark rm; |
| int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code |
| |
| // setup code generation tools |
| // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread) |
| // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread) |
| CodeBuffer buffer("exception_blob", 600+pad, 512); |
| MacroAssembler* masm = new MacroAssembler(&buffer); |
| |
| int framesize_in_words = 2; // FP + LR |
| int framesize_in_bytes = framesize_in_words * wordSize; |
| int framesize_in_slots = framesize_in_bytes / sizeof(jint); |
| |
| int start = __ offset(); |
| |
| __ str(Rexception_obj, Address(Rthread, JavaThread::exception_oop_offset())); |
| __ str(Rexception_pc, Address(Rthread, JavaThread::exception_pc_offset())); |
| |
| // This call does all the hard work. It checks if an exception catch |
| // exists in the method. |
| // If so, it returns the handler address. |
| // If the nmethod has been deoptimized and it had a handler the handler |
| // address is the deopt blob unpack_with_exception entry. |
| // |
| // If no handler exists it prepares for stack-unwinding, restoring the callee-save |
| // registers of the frame being removed. |
| // |
| __ mov(LR, Rexception_pc); |
| __ raw_push(FP, LR); |
| int pc_offset = __ set_last_Java_frame(SP, FP, false, Rtemp); |
| |
| __ mov(R0, Rthread); |
| |
| // This call can block at exit and nmethod can be deoptimized at that |
| // point. If the nmethod had a catch point we would jump to the |
| // now deoptimized catch point and fall thru the vanilla deopt |
| // path and lose the exception |
| // Sure would be simpler if this call didn't block! |
| __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)); |
| if (pc_offset == -1) { |
| pc_offset = __ offset(); |
| } |
| |
| // Set an oopmap for the call site. This oopmap will only be used if we |
| // are unwinding the stack. Hence, all locations will be dead. |
| // Callee-saved registers will be the same as the frame above (i.e., |
| // handle_exception_stub), since they were restored when we got the |
| // exception. |
| |
| OopMapSet *oop_maps = new OopMapSet(); |
| oop_maps->add_gc_map(pc_offset - start, new OopMap(framesize_in_slots, 0)); |
| |
| __ reset_last_Java_frame(Rtemp); |
| |
| __ raw_pop(FP, LR); |
| |
| // Restore SP from its saved reg (FP) if the exception PC is a MethodHandle call site. |
| __ ldr(Rtemp, Address(Rthread, JavaThread::is_method_handle_return_offset())); |
| #ifdef AARCH64 |
| Label skip; |
| __ cbz(Rtemp, skip); |
| __ mov(SP, Rmh_SP_save); |
| __ bind(skip); |
| #else |
| __ cmp(Rtemp, 0); |
| __ mov(SP, Rmh_SP_save, ne); |
| #endif |
| |
| // R0 contains handler address |
| // Since this may be the deopt blob we must set R5 to look like we returned |
| // from the original pc that threw the exception |
| |
| __ ldr(Rexception_pc, Address(Rthread, JavaThread::exception_pc_offset())); // R5/R20 |
| |
| __ ldr(Rexception_obj, Address(Rthread, JavaThread::exception_oop_offset())); // R4/R19 |
| __ mov(Rtemp, 0); |
| #ifdef ASSERT |
| __ str(Rtemp, Address(Rthread, JavaThread::exception_handler_pc_offset())); |
| __ str(Rtemp, Address(Rthread, JavaThread::exception_pc_offset())); |
| #endif |
| // Clear the exception oop so GC no longer processes it as a root. |
| __ str(Rtemp, Address(Rthread, JavaThread::exception_oop_offset())); |
| __ jump(R0); |
| |
| // ------------- |
| // make sure all code is generated |
| masm->flush(); |
| |
| _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); |
| } |