1 /* 2 * Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2018 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #ifdef COMPILER2 28 #include "asm/macroAssembler.inline.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "code/vmreg.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/interp_masm.hpp" 33 #include "memory/resourceArea.hpp" 34 #include "nativeInst_ppc.hpp" 35 #include "opto/runtime.hpp" 36 #include "runtime/interfaceSupport.hpp" 37 #include "runtime/sharedRuntime.hpp" 38 #include "runtime/stubRoutines.hpp" 39 #include "runtime/vframeArray.hpp" 40 #include "utilities/globalDefinitions.hpp" 41 #endif 42 43 #define __ masm-> 44 45 46 #ifdef COMPILER2 47 48 //------------------------------generate_exception_blob--------------------------- 49 // Creates exception blob at the end. 50 // Using exception blob, this code is jumped from a compiled method. 51 // 52 // Given an exception pc at a call we call into the runtime for the 53 // handler in this method. This handler might merely restore state 54 // (i.e. callee save registers) unwind the frame and jump to the 55 // exception handler for the nmethod if there is no Java level handler 56 // for the nmethod. 57 // 58 // This code is entered with a jmp. 59 // 60 // Arguments: 61 // R3_ARG1: exception oop 62 // R4_ARG2: exception pc 63 // 64 // Results: 65 // R3_ARG1: exception oop 66 // R4_ARG2: exception pc in caller 67 // destination: exception handler of caller 68 // 69 // Note: the exception pc MUST be at a call (precise debug information) 70 // 71 void OptoRuntime::generate_exception_blob() { 72 // Allocate space for the code. 73 ResourceMark rm; 74 // Setup code generation tools. 75 CodeBuffer buffer("exception_blob", 2048, 1024); 76 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer); 77 78 address start = __ pc(); 79 80 int frame_size_in_bytes = frame::abi_reg_args_size; 81 OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0); 82 83 // Exception pc is 'return address' for stack walker. 84 __ std(R4_ARG2/*exception pc*/, _abi(lr), R1_SP); 85 86 // Store the exception in the Thread object. 87 __ std(R3_ARG1/*exception oop*/, in_bytes(JavaThread::exception_oop_offset()), R16_thread); 88 __ std(R4_ARG2/*exception pc*/, in_bytes(JavaThread::exception_pc_offset()), R16_thread); 89 90 // Save callee-saved registers. 91 // Push a C frame for the exception blob. It is needed for the C call later on. 92 __ push_frame_reg_args(0, R11_scratch1); 93 94 // This call does all the hard work. It checks if an exception handler 95 // exists in the method. 96 // If so, it returns the handler address. 97 // If not, it prepares for stack-unwinding, restoring the callee-save 98 // registers of the frame being removed. 99 __ set_last_Java_frame(/*sp=*/R1_SP, noreg); 100 101 __ mr(R3_ARG1, R16_thread); 102 #if defined(ABI_ELFv2) 103 __ call_c((address) OptoRuntime::handle_exception_C, relocInfo::none); 104 #else 105 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, OptoRuntime::handle_exception_C), 106 relocInfo::none); 107 #endif 108 address calls_return_pc = __ last_calls_return_pc(); 109 # ifdef ASSERT 110 __ cmpdi(CCR0, R3_RET, 0); 111 __ asm_assert_ne("handle_exception_C must not return NULL", 0x601); 112 # endif 113 114 // Set an oopmap for the call site. This oopmap will only be used if we 115 // are unwinding the stack. Hence, all locations will be dead. 116 // Callee-saved registers will be the same as the frame above (i.e., 117 // handle_exception_stub), since they were restored when we got the 118 // exception. 119 OopMapSet* oop_maps = new OopMapSet(); 120 oop_maps->add_gc_map(calls_return_pc - start, map); 121 122 __ mtctr(R3_RET); // Move address of exception handler to SR_CTR. 123 __ reset_last_Java_frame(); 124 __ pop_frame(); 125 126 // We have a handler in register SR_CTR (could be deopt blob). 127 128 // Get the exception oop. 129 __ ld(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread); 130 131 // Get the exception pc in case we are deoptimized. 132 __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread); 133 134 // Reset thread values. 135 __ li(R0, 0); 136 #ifdef ASSERT 137 __ std(R0, in_bytes(JavaThread::exception_handler_pc_offset()), R16_thread); 138 __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread); 139 #endif 140 // Clear the exception oop so GC no longer processes it as a root. 141 __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread); 142 143 // Move exception pc into SR_LR. 144 __ mtlr(R4_ARG2); 145 __ bctr(); 146 147 // Make sure all code is generated. 148 masm->flush(); 149 150 // Set exception blob. 151 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, 152 frame_size_in_bytes/wordSize); 153 } 154 155 #endif // COMPILER2