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1 /*
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1567
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2 * Copyright 1998-2010 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 #include "incls/_precompiled.incl"
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26 #include "incls/_runtime_sparc.cpp.incl"
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27
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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 // (see emit_exception_handler in sparc.ad file)
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37 //
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38 // Given an exception pc at a call we call into the runtime for the
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39 // handler in this method. This handler might merely restore state
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40 // (i.e. callee save registers) unwind the frame and jump to the
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41 // exception handler for the nmethod if there is no Java level handler
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42 // for the nmethod.
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43 //
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44 // This code is entered with a jmp.
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45 //
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46 // Arguments:
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47 // O0: exception oop
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48 // O1: exception pc
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49 //
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50 // Results:
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51 // O0: exception oop
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52 // O1: exception pc in caller or ???
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53 // destination: exception handler of caller
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54 //
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55 // Note: the exception pc MUST be at a call (precise debug information)
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56 //
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57 void OptoRuntime::generate_exception_blob() {
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58 // allocate space for code
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59 ResourceMark rm;
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60 int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code
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61
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62 // setup code generation tools
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63 // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread)
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64 // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread)
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65 CodeBuffer buffer("exception_blob", 600+pad, 512);
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66 MacroAssembler* masm = new MacroAssembler(&buffer);
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67
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68 int framesize_in_bytes = __ total_frame_size_in_bytes(0);
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69 int framesize_in_words = framesize_in_bytes / wordSize;
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70 int framesize_in_slots = framesize_in_bytes / sizeof(jint);
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71
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72 Label L;
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73
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74 int start = __ offset();
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75
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76 __ verify_thread();
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727
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77 __ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset());
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78 __ st_ptr(Oissuing_pc, G2_thread, JavaThread::exception_pc_offset());
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0
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79
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80 // This call does all the hard work. It checks if an exception catch
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81 // exists in the method.
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82 // If so, it returns the handler address.
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83 // If the nmethod has been deoptimized and it had a handler the handler
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84 // address is the deopt blob unpack_with_exception entry.
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85 //
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86 // If no handler exists it prepares for stack-unwinding, restoring the callee-save
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87 // registers of the frame being removed.
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88 //
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89 __ save_frame(0);
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90
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91 __ mov(G2_thread, O0);
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92 __ set_last_Java_frame(SP, noreg);
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93 __ save_thread(L7_thread_cache);
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94
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95 // This call can block at exit and nmethod can be deoptimized at that
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96 // point. If the nmethod had a catch point we would jump to the
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97 // now deoptimized catch point and fall thru the vanilla deopt
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98 // path and lose the exception
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99 // Sure would be simpler if this call didn't block!
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100 __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type);
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101 __ delayed()->mov(L7_thread_cache, O0);
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102
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103 // Set an oopmap for the call site. This oopmap will only be used if we
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104 // are unwinding the stack. Hence, all locations will be dead.
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105 // Callee-saved registers will be the same as the frame above (i.e.,
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106 // handle_exception_stub), since they were restored when we got the
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107 // exception.
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108
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109 OopMapSet *oop_maps = new OopMapSet();
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110 oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0));
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111
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112 __ bind(L);
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113 __ restore_thread(L7_thread_cache);
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114 __ reset_last_Java_frame();
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115
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116 __ mov(O0, G3_scratch); // Move handler address to temp
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117 __ restore();
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118
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119 // Restore SP from L7 if the exception PC is a MethodHandle call site.
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120 __ lduw(Address(G2_thread, JavaThread::is_method_handle_return_offset()), O7);
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121 __ tst(O7);
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122 __ movcc(Assembler::notZero, false, Assembler::icc, L7_mh_SP_save, SP);
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123
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124 // G3_scratch contains handler address
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125 // Since this may be the deopt blob we must set O7 to look like we returned
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126 // from the original pc that threw the exception
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127
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128 __ ld_ptr(G2_thread, JavaThread::exception_pc_offset(), O7);
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129 __ sub(O7, frame::pc_return_offset, O7);
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130
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131
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132 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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133 __ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception); // O0
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134 #ifdef ASSERT
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135 __ st_ptr(G0, G2_thread, JavaThread::exception_handler_pc_offset());
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136 __ st_ptr(G0, G2_thread, JavaThread::exception_pc_offset());
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137 #endif
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138 __ JMP(G3_scratch, 0);
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139 // Clear the exception oop so GC no longer processes it as a root.
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140 __ delayed()->st_ptr(G0, G2_thread, JavaThread::exception_oop_offset());
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141
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142 // -------------
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143 // make sure all code is generated
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144 masm->flush();
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145
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146 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words);
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147 }
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