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