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1 /*
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2 * Copyright 1998-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25
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26 #include "incls/_precompiled.incl"
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27 #include "incls/_runtime_x86_32.cpp.incl"
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28
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29 #define __ masm->
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30
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31 ExceptionBlob* OptoRuntime::_exception_blob;
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32
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33 //------------------------------generate_exception_blob---------------------------
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34 // creates exception blob at the end
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35 // Using exception blob, this code is jumped from a compiled method.
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36 //
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37 // Given an exception pc at a call we call into the runtime for the
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38 // handler in this method. This handler might merely restore state
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39 // (i.e. callee save registers) unwind the frame and jump to the
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40 // exception handler for the nmethod if there is no Java level handler
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41 // for the nmethod.
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42 //
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43 // This code is entered with a jmp.
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44 //
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45 // Arguments:
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46 // rax,: exception oop
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47 // rdx: exception pc
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48 //
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49 // Results:
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50 // rax,: exception oop
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51 // rdx: exception pc in caller or ???
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52 // destination: exception handler of caller
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53 //
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54 // Note: the exception pc MUST be at a call (precise debug information)
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55 // Only register rax, rdx, rcx are not callee saved.
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56 //
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57
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58 void OptoRuntime::generate_exception_blob() {
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59
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60 // Capture info about frame layout
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61 enum layout {
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62 thread_off, // last_java_sp
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63 // The frame sender code expects that rbp will be in the "natural" place and
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64 // will override any oopMap setting for it. We must therefore force the layout
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65 // so that it agrees with the frame sender code.
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66 rbp_off,
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67 return_off, // slot for return address
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68 framesize
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69 };
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70
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71 // allocate space for the code
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72 ResourceMark rm;
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73 // setup code generation tools
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74 CodeBuffer buffer("exception_blob", 512, 512);
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75 MacroAssembler* masm = new MacroAssembler(&buffer);
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76
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77 OopMapSet *oop_maps = new OopMapSet();
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78
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79 address start = __ pc();
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80
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81 __ pushl(rdx);
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82 __ subl(rsp, return_off * wordSize); // Prolog!
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83
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84 // rbp, location is implicitly known
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85 __ movl(Address(rsp,rbp_off *wordSize),rbp);
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86
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87 // Store exception in Thread object. We cannot pass any arguments to the
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88 // handle_exception call, since we do not want to make any assumption
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89 // about the size of the frame where the exception happened in.
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90 __ get_thread(rcx);
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91 __ movl(Address(rcx, JavaThread::exception_oop_offset()), rax);
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92 __ movl(Address(rcx, JavaThread::exception_pc_offset()), rdx);
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93
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94 // This call does all the hard work. It checks if an exception handler
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95 // exists in the method.
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96 // If so, it returns the handler address.
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97 // If not, it prepares for stack-unwinding, restoring the callee-save
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98 // registers of the frame being removed.
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99 //
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100 __ movl(Address(rsp, thread_off * wordSize), rcx); // Thread is first argument
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101 __ set_last_Java_frame(rcx, noreg, noreg, NULL);
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102
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103 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
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104
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105 // No registers to map, rbp is known implicitly
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106 oop_maps->add_gc_map( __ pc() - start, new OopMap( framesize, 0 ));
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107 __ get_thread(rcx);
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108 __ reset_last_Java_frame(rcx, false, false);
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109
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110 // Restore callee-saved registers
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111 __ movl(rbp, Address(rsp, rbp_off * wordSize));
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112
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113 __ addl(rsp, return_off * wordSize); // Epilog!
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114 __ popl(rdx); // Exception pc
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115
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116
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117 // rax,: exception handler for given <exception oop/exception pc>
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118
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119 // We have a handler in rax, (could be deopt blob)
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120 // rdx - throwing pc, deopt blob will need it.
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121
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122 __ pushl(rax);
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123
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124 // rcx contains handler address
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125
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126 __ get_thread(rcx); // TLS
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127 // Get the exception
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128 __ movl(rax, Address(rcx, JavaThread::exception_oop_offset()));
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129 // Get the exception pc in case we are deoptimized
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130 __ movl(rdx, Address(rcx, JavaThread::exception_pc_offset()));
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131 #ifdef ASSERT
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132 __ movl(Address(rcx, JavaThread::exception_handler_pc_offset()), 0);
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133 __ movl(Address(rcx, JavaThread::exception_pc_offset()), 0);
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134 #endif
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135 // Clear the exception oop so GC no longer processes it as a root.
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136 __ movl(Address(rcx, JavaThread::exception_oop_offset()), 0);
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137
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138 __ popl(rcx);
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139
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140 // rax,: exception oop
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141 // rcx: exception handler
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142 // rdx: exception pc
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143 __ jmp (rcx);
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144
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145 // -------------
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146 // make sure all code is generated
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147 masm->flush();
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148
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149 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize);
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150 }
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