1/* 2 * Copyright (c) 1998, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#ifdef COMPILER2 27#include "asm/macroAssembler.inline.hpp" 28#include "classfile/systemDictionary.hpp" 29#include "code/vmreg.hpp" 30#include "interpreter/interpreter.hpp" 31#include "memory/resourceArea.hpp" 32#include "nativeInst_sparc.hpp" 33#include "opto/runtime.hpp" 34#include "runtime/interfaceSupport.hpp" 35#include "runtime/sharedRuntime.hpp" 36#include "runtime/stubRoutines.hpp" 37#include "runtime/vframeArray.hpp" 38#include "utilities/globalDefinitions.hpp" 39#include "vmreg_sparc.inline.hpp" 40#endif 41 42 43#define __ masm-> 44 45//------------------------------ generate_exception_blob --------------------------- 46// creates exception blob at the end 47// Using exception blob, this code is jumped from a compiled method. 48// (see emit_exception_handler in sparc.ad file) 49// 50// Given an exception pc at a call we call into the runtime for the 51// handler in this method. This handler might merely restore state 52// (i.e. callee save registers) unwind the frame and jump to the 53// exception handler for the nmethod if there is no Java level handler 54// for the nmethod. 55// 56// This code is entered with a jmp. 57// 58// Arguments: 59// O0: exception oop 60// O1: exception pc 61// 62// Results: 63// O0: exception oop 64// O1: exception pc in caller or ??? 65// destination: exception handler of caller 66// 67// Note: the exception pc MUST be at a call (precise debug information) 68// 69void OptoRuntime::generate_exception_blob() { 70 // allocate space for code 71 ResourceMark rm; 72 int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code 73 74 // setup code generation tools 75 // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread) 76 // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread) 77 CodeBuffer buffer("exception_blob", 600+pad, 512); 78 MacroAssembler* masm = new MacroAssembler(&buffer); 79 80 int framesize_in_bytes = __ total_frame_size_in_bytes(0); 81 int framesize_in_words = framesize_in_bytes / wordSize; 82 int framesize_in_slots = framesize_in_bytes / sizeof(jint); 83 84 Label L; 85 86 int start = __ offset(); 87 88 __ verify_thread(); 89 __ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset()); 90 __ st_ptr(Oissuing_pc, G2_thread, JavaThread::exception_pc_offset()); 91 92 // This call does all the hard work. It checks if an exception catch 93 // exists in the method. 94 // If so, it returns the handler address. 95 // If the nmethod has been deoptimized and it had a handler the handler 96 // address is the deopt blob unpack_with_exception entry. 97 // 98 // If no handler exists it prepares for stack-unwinding, restoring the callee-save 99 // registers of the frame being removed. 100 // 101 __ save_frame(0); 102 103 __ mov(G2_thread, O0); 104 __ set_last_Java_frame(SP, noreg); 105 __ save_thread(L7_thread_cache); 106 107 // This call can block at exit and nmethod can be deoptimized at that 108 // point. If the nmethod had a catch point we would jump to the 109 // now deoptimized catch point and fall thru the vanilla deopt 110 // path and lose the exception 111 // Sure would be simpler if this call didn't block! 112 __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type); 113 __ delayed()->mov(L7_thread_cache, O0); 114 115 // Set an oopmap for the call site. This oopmap will only be used if we 116 // are unwinding the stack. Hence, all locations will be dead. 117 // Callee-saved registers will be the same as the frame above (i.e., 118 // handle_exception_stub), since they were restored when we got the 119 // exception. 120 121 OopMapSet *oop_maps = new OopMapSet(); 122 oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0)); 123 124 __ bind(L); 125 __ restore_thread(L7_thread_cache); 126 __ reset_last_Java_frame(); 127 128 __ mov(O0, G3_scratch); // Move handler address to temp 129 __ restore(); 130 131 // Restore SP from L7 if the exception PC is a MethodHandle call site. 132 __ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), O7); 133 __ tst(O7); 134 __ movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP); 135 136 // G3_scratch contains handler address 137 // Since this may be the deopt blob we must set O7 to look like we returned 138 // from the original pc that threw the exception 139 140 __ ld_ptr(G2_thread, JavaThread::exception_pc_offset(), O7); 141 __ sub(O7, frame::pc_return_offset, O7); 142 143 144 assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot"); 145 __ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception); // O0 146#ifdef ASSERT 147 __ st_ptr(G0, G2_thread, JavaThread::exception_handler_pc_offset()); 148 __ st_ptr(G0, G2_thread, JavaThread::exception_pc_offset()); 149#endif 150 __ JMP(G3_scratch, 0); 151 // Clear the exception oop so GC no longer processes it as a root. 152 __ delayed()->st_ptr(G0, G2_thread, JavaThread::exception_oop_offset()); 153 154 // ------------- 155 // make sure all code is generated 156 masm->flush(); 157 158 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); 159} 160