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1 /*
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2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #include "precompiled.hpp"
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27 #ifdef COMPILER2
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28 #include "asm/assembler.inline.hpp"
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29 #include "asm/macroAssembler.inline.hpp"
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30 #include "classfile/systemDictionary.hpp"
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31 #include "code/vmreg.hpp"
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32 #include "interpreter/interpreter.hpp"
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33 #include "nativeInst_ppc.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_ppc.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
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46 #ifdef COMPILER2
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47
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48 // SP adjustment (must use unextended SP) for method handle call sites
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49 // during exception handling.
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50 static intptr_t adjust_SP_for_methodhandle_callsite(JavaThread *thread) {
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51 RegisterMap map(thread, false);
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52 // The frame constructor will do the correction for us (see frame::adjust_unextended_SP).
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53 frame mh_caller_frame = thread->last_frame().sender(&map);
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54 assert(mh_caller_frame.is_compiled_frame(), "Only may reach here for compiled MH call sites");
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55 return (intptr_t) mh_caller_frame.unextended_sp();
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56 }
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57
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58 //------------------------------generate_exception_blob---------------------------
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59 // Creates exception blob at the end.
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60 // Using exception blob, this code is jumped from a compiled method.
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61 //
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62 // Given an exception pc at a call we call into the runtime for the
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63 // handler in this method. This handler might merely restore state
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64 // (i.e. callee save registers) unwind the frame and jump to the
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65 // exception handler for the nmethod if there is no Java level handler
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66 // for the nmethod.
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67 //
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68 // This code is entered with a jmp.
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69 //
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70 // Arguments:
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71 // R3_ARG1: exception oop
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72 // R4_ARG2: exception pc
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73 //
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74 // Results:
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75 // R3_ARG1: exception oop
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76 // R4_ARG2: exception pc in caller
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77 // destination: exception handler of caller
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78 //
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79 // Note: the exception pc MUST be at a call (precise debug information)
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80 //
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81 void OptoRuntime::generate_exception_blob() {
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82 // Allocate space for the code.
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83 ResourceMark rm;
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84 // Setup code generation tools.
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85 CodeBuffer buffer("exception_blob", 2048, 1024);
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86 InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);
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87
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88 address start = __ pc();
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89
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90 int frame_size_in_bytes = frame::abi_reg_args_size;
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91 OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);
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92
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93 // Exception pc is 'return address' for stack walker.
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94 __ std(R4_ARG2/*exception pc*/, _abi(lr), R1_SP);
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95
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96 // Store the exception in the Thread object.
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97 __ std(R3_ARG1/*exception oop*/, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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98 __ std(R4_ARG2/*exception pc*/, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
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99
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100 // Save callee-saved registers.
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101 // Push a C frame for the exception blob. It is needed for the C call later on.
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102 __ push_frame_reg_args(0, R11_scratch1);
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103
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104 // This call does all the hard work. It checks if an exception handler
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105 // exists in the method.
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106 // If so, it returns the handler address.
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107 // If not, it prepares for stack-unwinding, restoring the callee-save
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108 // registers of the frame being removed.
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109 __ set_last_Java_frame(/*sp=*/R1_SP, noreg);
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110
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111 __ mr(R3_ARG1, R16_thread);
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112 #if defined(ABI_ELFv2)
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113 __ call_c((address) OptoRuntime::handle_exception_C, relocInfo::none);
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114 #else
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115 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, OptoRuntime::handle_exception_C),
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116 relocInfo::none);
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117 #endif
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118 address calls_return_pc = __ last_calls_return_pc();
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119 # ifdef ASSERT
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120 __ cmpdi(CCR0, R3_RET, 0);
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121 __ asm_assert_ne("handle_exception_C must not return NULL", 0x601);
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122 # endif
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123
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124 // Set an oopmap for the call site. This oopmap will only be used if we
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125 // are unwinding the stack. Hence, all locations will be dead.
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126 // Callee-saved registers will be the same as the frame above (i.e.,
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127 // handle_exception_stub), since they were restored when we got the
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128 // exception.
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129 OopMapSet* oop_maps = new OopMapSet();
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130 oop_maps->add_gc_map(calls_return_pc - start, map);
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131
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132 // Get unextended_sp for method handle call sites.
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133 Label mh_callsite, mh_done; // Use a 2nd c call if it's a method handle call site.
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134 __ lwa(R4_ARG2, in_bytes(JavaThread::is_method_handle_return_offset()), R16_thread);
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135 __ cmpwi(CCR0, R4_ARG2, 0);
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136 __ bne(CCR0, mh_callsite);
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137
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138 __ mtctr(R3_RET); // Move address of exception handler to SR_CTR.
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139 __ reset_last_Java_frame();
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140 __ pop_frame();
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141
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142 __ bind(mh_done);
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143 // We have a handler in register SR_CTR (could be deopt blob).
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144
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145 // Get the exception oop.
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146 __ ld(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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147
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148 // Get the exception pc in case we are deoptimized.
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149 __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
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150
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151 // Reset thread values.
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152 __ li(R0, 0);
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153 #ifdef ASSERT
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154 __ std(R0, in_bytes(JavaThread::exception_handler_pc_offset()), R16_thread);
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155 __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread);
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156 #endif
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157 // Clear the exception oop so GC no longer processes it as a root.
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158 __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);
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159
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160 // Move exception pc into SR_LR.
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161 __ mtlr(R4_ARG2);
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162 __ bctr();
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163
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164
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165 // Same as above, but also set sp to unextended_sp.
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166 __ bind(mh_callsite);
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167 __ mr(R31, R3_RET); // Save branch address.
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168 __ mr(R3_ARG1, R16_thread);
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169 #if defined(ABI_ELFv2)
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170 __ call_c((address) adjust_SP_for_methodhandle_callsite, relocInfo::none);
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171 #else
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172 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, adjust_SP_for_methodhandle_callsite), relocInfo::none);
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173 #endif
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174 // Returns unextended_sp in R3_RET.
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175
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176 __ mtctr(R31); // Move address of exception handler to SR_CTR.
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177 __ reset_last_Java_frame();
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178
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179 __ mr(R1_SP, R3_RET); // Set sp to unextended_sp.
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180 __ b(mh_done);
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181
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182
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183 // Make sure all code is generated.
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184 masm->flush();
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185
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186 // Set exception blob.
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187 _exception_blob = ExceptionBlob::create(&buffer, oop_maps,
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188 frame_size_in_bytes/wordSize);
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189 }
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190
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191 #endif // COMPILER2
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