aoqi@1: /*
aoqi@1:  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@1:  * Copyright (c) 2015, 2016, Loongson Technology. All rights reserved.
aoqi@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@1:  *
aoqi@1:  * This code is free software; you can redistribute it and/or modify it
aoqi@1:  * under the terms of the GNU General Public License version 2 only, as
aoqi@1:  * published by the Free Software Foundation.
aoqi@1:  *
aoqi@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@1:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@1:  * accompanied this code).
aoqi@1:  *
aoqi@1:  * You should have received a copy of the GNU General Public License version
aoqi@1:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@1:  *
aoqi@1:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@1:  * or visit www.oracle.com if you need additional information or have any
aoqi@1:  * questions.
aoqi@1:  *
aoqi@1:  */
aoqi@1: 
aoqi@1: #include "precompiled.hpp"
aoqi@1: #ifdef COMPILER2
aoqi@1: #include "asm/macroAssembler.hpp"
aoqi@1: #include "asm/macroAssembler.inline.hpp"
aoqi@1: #include "classfile/systemDictionary.hpp"
aoqi@1: #include "code/vmreg.hpp"
aoqi@1: #include "interpreter/interpreter.hpp"
aoqi@1: #include "opto/runtime.hpp"
aoqi@1: #include "runtime/interfaceSupport.hpp"
aoqi@1: #include "runtime/sharedRuntime.hpp"
aoqi@1: #include "runtime/stubRoutines.hpp"
aoqi@1: #include "runtime/vframeArray.hpp"
aoqi@1: #include "utilities/globalDefinitions.hpp"
aoqi@1: #include "vmreg_mips.inline.hpp"
aoqi@1: #endif
aoqi@1: 
aoqi@1: #define __ masm->
aoqi@1: 
aoqi@1: //-------------- generate_exception_blob -----------
aoqi@1: // creates _exception_blob.
aoqi@1: // The exception blob is jumped to from a compiled method.
aoqi@1: // (see emit_exception_handler in sparc.ad file)
aoqi@1: // 
aoqi@1: // Given an exception pc at a call we call into the runtime for the
aoqi@1: // handler in this method. This handler might merely restore state
aoqi@1: // (i.e. callee save registers) unwind the frame and jump to the
aoqi@1: // exception handler for the nmethod if there is no Java level handler
aoqi@1: // for the nmethod.
aoqi@1: //
aoqi@1: // This code is entered with a jump, and left with a jump.
aoqi@1: // 
aoqi@1: // Arguments:
aoqi@1: //   V0: exception oop
aoqi@1: //   V1: exception pc
aoqi@1: //
aoqi@1: // Results:
aoqi@1: //   A0: exception oop
aoqi@1: //   A1: exception pc in caller or ???
aoqi@1: //   jumps to: exception handler of caller
aoqi@1: // 
aoqi@1: // Note: the exception pc MUST be at a call (precise debug information)
aoqi@1: //
aoqi@1: // 2012/9/14 Jin: [stubGenerator_mips.cpp] generate_forward_exception()
aoqi@1: //                    |- V0, V1 are created
aoqi@1: //                    |- T9 <= SharedRuntime::exception_handler_for_return_address
aoqi@1: //                    `- jr T9
aoqi@1: //                         `- the caller's exception_handler
aoqi@1: //                               `- jr OptoRuntime::exception_blob
aoqi@1: //                                      `- here
aoqi@1: //
aoqi@1: void OptoRuntime::generate_exception_blob() {
aoqi@1:   // Capture info about frame layout
aoqi@1:   enum layout {
aoqi@1:     fp_off,
aoqi@1:     return_off,                 // slot for return address
aoqi@1:     framesize
aoqi@1:   };
aoqi@1: 
aoqi@1:   // allocate space for the code
aoqi@1:   ResourceMark rm;
aoqi@1:   // setup code generation tools
aoqi@1:   CodeBuffer   buffer("exception_blob", 5120, 5120);
aoqi@1:   MacroAssembler* masm = new MacroAssembler(&buffer);
aoqi@1: 
aoqi@1: //  OopMapSet *oop_maps = new OopMapSet();
aoqi@1: 
aoqi@1:   address start = __ pc();
aoqi@1: 
aoqi@1:   __ daddiu(SP, SP, -1 * framesize * wordSize);   // Prolog!
aoqi@1: 
aoqi@1:   /* 2012/9.27 Jin: this frame will be treated as the original caller method.
aoqi@1:    * So, the return pc should be filled with the original exception pc.
aoqi@1:    *   ref: X86's implementation
aoqi@1:    */
aoqi@1:   __ sd(V1, SP, return_off  *wordSize);	// return address
aoqi@1:   __ sd(FP, SP, fp_off  *wordSize);	// EBP
aoqi@1: 
aoqi@1:   // Save callee saved registers.  None for UseSSE=0, 
aoqi@1:   // floats-only for UseSSE=1, and doubles for UseSSE=2.
aoqi@1: 
aoqi@1:   __ daddiu(FP, SP, fp_off * wordSize);
aoqi@1: 
aoqi@1:   // Store exception in Thread object. We cannot pass any arguments to the
aoqi@1:   // handle_exception call, since we do not want to make any assumption
aoqi@1:   // about the size of the frame where the exception happened in.
aoqi@1:   Register thread = TREG;
aoqi@1: 
aoqi@1: #ifndef OPT_THREAD
aoqi@1:   __ get_thread(thread);
aoqi@1: #endif
aoqi@1: 
aoqi@1:   __ sd(V0, Address(thread, JavaThread::exception_oop_offset()));
aoqi@1:   __ sd(V1, Address(thread, JavaThread::exception_pc_offset()));
aoqi@1: 
aoqi@1:   // This call does all the hard work.  It checks if an exception handler
aoqi@1:   // exists in the method.
aoqi@1:   // If so, it returns the handler address.
aoqi@1:   // If not, it prepares for stack-unwinding, restoring the callee-save
aoqi@1:   // registers of the frame being removed.
aoqi@1:   __ set_last_Java_frame(thread, NOREG, NOREG, NULL);
aoqi@1: 
aoqi@1:   __ move(AT, -(StackAlignmentInBytes));
aoqi@1:   __ andr(SP, SP, AT);   // Fix stack alignment as required by ABI
aoqi@1: 
aoqi@1:   __ relocate(relocInfo::internal_pc_type);
aoqi@1: 
aoqi@1:   {
aoqi@1:     long save_pc = (long)__ pc() +  24 + NativeCall::return_address_offset;
aoqi@1:     __ li48(AT, save_pc);
aoqi@1:   }
aoqi@1:   __ sd(AT, thread, in_bytes(JavaThread::last_Java_pc_offset()));
aoqi@1: 
aoqi@1:   __ move(A0, thread);
aoqi@1:   __ li48(T9, (long)OptoRuntime::handle_exception_C);
aoqi@1:   __ jalr(T9);
aoqi@1:   __ delayed()->nop();
aoqi@1: 
aoqi@1:   // Set an oopmap for the call site
aoqi@1:   OopMapSet *oop_maps = new OopMapSet();
aoqi@1:   OopMap* map =  new OopMap( framesize, 0 );
aoqi@1: 
aoqi@1:   oop_maps->add_gc_map( __ offset(), map);
aoqi@1: 
aoqi@1: #ifndef OPT_THREAD
aoqi@1:   __ get_thread(thread);
aoqi@1: #endif
aoqi@1:   __ reset_last_Java_frame(thread, true, true);
aoqi@1: 
aoqi@1:   // Pop self-frame.
aoqi@1:   __ leave();     // Epilog!
aoqi@1: 
aoqi@1:   // rax,: exception handler for given <exception oop/exception pc>
aoqi@1: 
aoqi@1:   // We have a handler in rax, (could be deopt blob)
aoqi@1:   // rdx - throwing pc, deopt blob will need it.
aoqi@1:   /* FIXME: rdx? */
aoqi@1: 
aoqi@1:   // rcx contains handler address
aoqi@1:   __ move(T9, V0);
aoqi@1: 
aoqi@1: #ifndef OPT_THREAD
aoqi@1:   __ get_thread(thread);
aoqi@1: #endif
aoqi@1:   // Get the exception
aoqi@1:   __ ld(A0, Address(thread, JavaThread::exception_oop_offset()));
aoqi@1:   // Get the exception pc in case we are deoptimized
aoqi@1:   __ ld(A1, Address(thread, JavaThread::exception_pc_offset()));
aoqi@1: #ifdef ASSERT
aoqi@1:   __ sd(R0, Address(thread, JavaThread::exception_handler_pc_offset()));
aoqi@1:   __ sd(R0, Address(thread, JavaThread::exception_pc_offset()));
aoqi@1: #endif
aoqi@1:   // Clear the exception oop so GC no longer processes it as a root.
aoqi@1:   __ sd(R0, Address(thread, JavaThread::exception_oop_offset()));
aoqi@1: 
aoqi@1:   /* 2014/5/12 Jin: Fix seg fault when running:
aoqi@1:    *    Eclipse + Plugin + Debug As
aoqi@1:    *  This is the only condition where C2 calls SharedRuntime::generate_deopt_blob()
aoqi@1:    *
aoqi@1:    *  Ref:  http://10.2.5.21:8000/projects/java/wiki/Jgj-log-2014-5-12_
aoqi@1:    */
aoqi@1:   __ move(V0, A0);
aoqi@1:   __ move(V1, A1);
aoqi@1: 
aoqi@1:   // rax,: exception oop
aoqi@1:   // rcx: exception handler
aoqi@1:   // rdx: exception pc
aoqi@1:   __ jr(T9);
aoqi@1:   __ delayed()->nop();
aoqi@1: 
aoqi@1:   // make sure all code is generated
aoqi@1:   masm->flush();
aoqi@1: 
aoqi@1:   _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
aoqi@1: }