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1 /* |
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2 * Copyright (c) 2008, 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/assembler.hpp" |
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28 #include "assembler_arm.inline.hpp" |
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29 #include "classfile/systemDictionary.hpp" |
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30 #include "code/vmreg.hpp" |
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31 #include "interpreter/interpreter.hpp" |
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32 #include "memory/resourceArea.hpp" |
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33 #include "nativeInst_arm.hpp" |
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34 #include "opto/runtime.hpp" |
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35 #include "runtime/interfaceSupport.hpp" |
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36 #include "runtime/sharedRuntime.hpp" |
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37 #include "runtime/stubRoutines.hpp" |
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38 #include "runtime/vframeArray.hpp" |
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39 #include "utilities/globalDefinitions.hpp" |
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40 #include "vmreg_arm.inline.hpp" |
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41 #endif |
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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 // Rexception_obj (R4/R19): exception oop |
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60 // Rexception_pc (R5/R20): exception pc |
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61 // |
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62 // Results: |
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63 // Rexception_obj (R4/R19): 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_words = 2; // FP + LR |
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81 int framesize_in_bytes = framesize_in_words * 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 int start = __ offset(); |
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85 |
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86 __ str(Rexception_obj, Address(Rthread, JavaThread::exception_oop_offset())); |
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87 __ str(Rexception_pc, Address(Rthread, JavaThread::exception_pc_offset())); |
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88 |
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89 // This call does all the hard work. It checks if an exception catch |
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90 // exists in the method. |
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91 // If so, it returns the handler address. |
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92 // If the nmethod has been deoptimized and it had a handler the handler |
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93 // address is the deopt blob unpack_with_exception entry. |
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94 // |
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95 // If no handler exists it prepares for stack-unwinding, restoring the callee-save |
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96 // registers of the frame being removed. |
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97 // |
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98 __ mov(LR, Rexception_pc); |
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99 __ raw_push(FP, LR); |
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100 int pc_offset = __ set_last_Java_frame(SP, FP, false, Rtemp); |
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101 |
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102 __ mov(R0, Rthread); |
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103 |
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104 // This call can block at exit and nmethod can be deoptimized at that |
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105 // point. If the nmethod had a catch point we would jump to the |
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106 // now deoptimized catch point and fall thru the vanilla deopt |
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107 // path and lose the exception |
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108 // Sure would be simpler if this call didn't block! |
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109 __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)); |
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110 if (pc_offset == -1) { |
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111 pc_offset = __ offset(); |
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112 } |
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113 |
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114 // Set an oopmap for the call site. This oopmap will only be used if we |
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115 // are unwinding the stack. Hence, all locations will be dead. |
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116 // Callee-saved registers will be the same as the frame above (i.e., |
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117 // handle_exception_stub), since they were restored when we got the |
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118 // exception. |
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119 |
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120 OopMapSet *oop_maps = new OopMapSet(); |
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121 oop_maps->add_gc_map(pc_offset - start, new OopMap(framesize_in_slots, 0)); |
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122 |
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123 __ reset_last_Java_frame(Rtemp); |
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124 |
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125 __ raw_pop(FP, LR); |
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126 |
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127 // Restore SP from its saved reg (FP) if the exception PC is a MethodHandle call site. |
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128 __ ldr(Rtemp, Address(Rthread, JavaThread::is_method_handle_return_offset())); |
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129 #ifdef AARCH64 |
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130 Label skip; |
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131 __ cbz(Rtemp, skip); |
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132 __ mov(SP, Rmh_SP_save); |
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133 __ bind(skip); |
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134 #else |
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135 __ cmp(Rtemp, 0); |
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136 __ mov(SP, Rmh_SP_save, ne); |
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137 #endif |
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138 |
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139 // R0 contains handler address |
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140 // Since this may be the deopt blob we must set R5 to look like we returned |
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141 // from the original pc that threw the exception |
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142 |
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143 __ ldr(Rexception_pc, Address(Rthread, JavaThread::exception_pc_offset())); // R5/R20 |
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144 |
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145 __ ldr(Rexception_obj, Address(Rthread, JavaThread::exception_oop_offset())); // R4/R19 |
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146 __ mov(Rtemp, 0); |
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147 #ifdef ASSERT |
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148 __ str(Rtemp, Address(Rthread, JavaThread::exception_handler_pc_offset())); |
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149 __ str(Rtemp, Address(Rthread, JavaThread::exception_pc_offset())); |
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150 #endif |
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151 // Clear the exception oop so GC no longer processes it as a root. |
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152 __ str(Rtemp, Address(Rthread, JavaThread::exception_oop_offset())); |
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153 __ jump(R0); |
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154 |
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155 // ------------- |
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156 // make sure all code is generated |
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157 masm->flush(); |
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158 |
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159 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words); |
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160 } |