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0
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1 /*
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2 * Copyright 1999-2007 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 // do not include precompiled header file
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26 # include "incls/_os_windows_x86.cpp.incl"
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27 # include "unwind_windows_x86.hpp"
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28 #undef REG_SP
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29 #undef REG_FP
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30 #undef REG_PC
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31 #ifdef AMD64
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32 #define REG_SP Rsp
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33 #define REG_FP Rbp
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34 #define REG_PC Rip
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35 #else
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36 #define REG_SP Esp
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37 #define REG_FP Ebp
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38 #define REG_PC Eip
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39 #endif // AMD64
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40
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41 extern LONG WINAPI topLevelExceptionFilter(_EXCEPTION_POINTERS* );
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42
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43 // Install a win32 structured exception handler around thread.
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44 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) {
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45 __try {
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46
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47 #ifndef AMD64
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48 // We store the current thread in this wrapperthread location
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49 // and determine how far away this address is from the structured
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50 // execption pointer that FS:[0] points to. This get_thread
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51 // code can then get the thread pointer via FS.
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52 //
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53 // Warning: This routine must NEVER be inlined since we'd end up with
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54 // multiple offsets.
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55 //
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56 volatile Thread* wrapperthread = thread;
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57
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58 if ( ThreadLocalStorage::get_thread_ptr_offset() == 0 ) {
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59 int thread_ptr_offset;
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60 __asm {
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61 lea eax, dword ptr wrapperthread;
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62 sub eax, dword ptr FS:[0H];
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63 mov thread_ptr_offset, eax
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64 };
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65 ThreadLocalStorage::set_thread_ptr_offset(thread_ptr_offset);
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66 }
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67 #ifdef ASSERT
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68 // Verify that the offset hasn't changed since we initally captured
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69 // it. This might happen if we accidentally ended up with an
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70 // inlined version of this routine.
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71 else {
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72 int test_thread_ptr_offset;
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73 __asm {
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74 lea eax, dword ptr wrapperthread;
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75 sub eax, dword ptr FS:[0H];
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76 mov test_thread_ptr_offset, eax
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77 };
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78 assert(test_thread_ptr_offset == ThreadLocalStorage::get_thread_ptr_offset(),
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79 "thread pointer offset from SEH changed");
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80 }
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81 #endif // ASSERT
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82 #endif // !AMD64
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83
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84 f(value, method, args, thread);
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85 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) {
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86 // Nothing to do.
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87 }
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88 }
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89
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90 #ifdef AMD64
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91
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92 // This is the language specific handler for exceptions
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93 // originating from dynamically generated code.
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94 // We call the standard structured exception handler
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95 // We only expect Continued Execution since we cannot unwind
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96 // from generated code.
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97 LONG HandleExceptionFromCodeCache(
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98 IN PEXCEPTION_RECORD ExceptionRecord,
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99 IN ULONG64 EstablisherFrame,
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100 IN OUT PCONTEXT ContextRecord,
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101 IN OUT PDISPATCHER_CONTEXT DispatcherContext) {
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102 EXCEPTION_POINTERS ep;
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103 LONG result;
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104
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105 ep.ExceptionRecord = ExceptionRecord;
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106 ep.ContextRecord = ContextRecord;
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107
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108 result = topLevelExceptionFilter(&ep);
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109
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110 // We better only get a CONTINUE_EXECUTION from our handler
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111 // since we don't have unwind information registered.
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112
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113 guarantee( result == EXCEPTION_CONTINUE_EXECUTION,
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114 "Unexpected result from topLevelExceptionFilter");
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115
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116 return(ExceptionContinueExecution);
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117 }
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118
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119
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120 // Structure containing the Windows Data Structures required
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121 // to register our Code Cache exception handler.
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122 // We put these in the CodeCache since the API requires
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123 // all addresses in these structures are relative to the Code
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124 // area registered with RtlAddFunctionTable.
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125 typedef struct {
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126 char ExceptionHandlerInstr[16]; // jmp HandleExceptionFromCodeCache
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127 RUNTIME_FUNCTION rt;
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128 UNWIND_INFO_EH_ONLY unw;
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129 } DynamicCodeData, *pDynamicCodeData;
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130
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131 #endif // AMD64
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132 //
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133 // Register our CodeCache area with the OS so it will dispatch exceptions
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134 // to our topLevelExceptionFilter when we take an exception in our
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135 // dynamically generated code.
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136 //
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137 // Arguments: low and high are the address of the full reserved
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138 // codeCache area
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139 //
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140 bool os::register_code_area(char *low, char *high) {
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141 #ifdef AMD64
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142
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143 ResourceMark rm;
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144
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145 pDynamicCodeData pDCD;
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146 PRUNTIME_FUNCTION prt;
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147 PUNWIND_INFO_EH_ONLY punwind;
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148
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149 // If we are using Vectored Exceptions we don't need this registration
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150 if (UseVectoredExceptions) return true;
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151
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152 BufferBlob* b = BufferBlob::create("CodeCache Exception Handler", sizeof (DynamicCodeData));
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153 CodeBuffer cb(b->instructions_begin(), b->instructions_size());
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154 MacroAssembler* masm = new MacroAssembler(&cb);
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155 pDCD = (pDynamicCodeData) masm->pc();
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156
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157 masm->jump(ExternalAddress((address)&HandleExceptionFromCodeCache));
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158 masm->flush();
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159
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160 // Create an Unwind Structure specifying no unwind info
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161 // other than an Exception Handler
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162 punwind = &pDCD->unw;
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163 punwind->Version = 1;
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164 punwind->Flags = UNW_FLAG_EHANDLER;
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165 punwind->SizeOfProlog = 0;
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166 punwind->CountOfCodes = 0;
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167 punwind->FrameRegister = 0;
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168 punwind->FrameOffset = 0;
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169 punwind->ExceptionHandler = (char *)(&(pDCD->ExceptionHandlerInstr[0])) -
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170 (char*)low;
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171 punwind->ExceptionData[0] = 0;
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172
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173 // This structure describes the covered dynamic code area.
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174 // Addresses are relative to the beginning on the code cache area
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175 prt = &pDCD->rt;
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176 prt->BeginAddress = 0;
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177 prt->EndAddress = (ULONG)(high - low);
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178 prt->UnwindData = ((char *)punwind - low);
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179
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180 guarantee(RtlAddFunctionTable(prt, 1, (ULONGLONG)low),
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181 "Failed to register Dynamic Code Exception Handler with RtlAddFunctionTable");
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182
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183 #endif // AMD64
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184 return true;
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185 }
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186
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187 void os::initialize_thread() {
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188 // Nothing to do.
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189 }
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190
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191 // Atomics and Stub Functions
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192
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193 typedef jint xchg_func_t (jint, volatile jint*);
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194 typedef intptr_t xchg_ptr_func_t (intptr_t, volatile intptr_t*);
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195 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
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196 typedef jlong cmpxchg_long_func_t (jlong, volatile jlong*, jlong);
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197 typedef jint add_func_t (jint, volatile jint*);
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198 typedef intptr_t add_ptr_func_t (intptr_t, volatile intptr_t*);
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199 typedef void fence_func_t ();
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200
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201 #ifdef AMD64
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202
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203 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
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204 // try to use the stub:
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205 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
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206
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207 if (func != NULL) {
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208 os::atomic_xchg_func = func;
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209 return (*func)(exchange_value, dest);
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210 }
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211 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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212
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213 jint old_value = *dest;
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214 *dest = exchange_value;
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215 return old_value;
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216 }
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217
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218 intptr_t os::atomic_xchg_ptr_bootstrap(intptr_t exchange_value, volatile intptr_t* dest) {
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219 // try to use the stub:
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220 xchg_ptr_func_t* func = CAST_TO_FN_PTR(xchg_ptr_func_t*, StubRoutines::atomic_xchg_ptr_entry());
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221
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222 if (func != NULL) {
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223 os::atomic_xchg_ptr_func = func;
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224 return (*func)(exchange_value, dest);
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225 }
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226 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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227
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228 intptr_t old_value = *dest;
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229 *dest = exchange_value;
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230 return old_value;
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231 }
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232
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233
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234 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
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235 // try to use the stub:
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236 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
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237
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238 if (func != NULL) {
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239 os::atomic_cmpxchg_func = func;
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240 return (*func)(exchange_value, dest, compare_value);
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241 }
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242 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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243
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244 jint old_value = *dest;
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245 if (old_value == compare_value)
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246 *dest = exchange_value;
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247 return old_value;
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248 }
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249 #endif // AMD64
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250
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251 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
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252 // try to use the stub:
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253 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
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254
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255 if (func != NULL) {
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256 os::atomic_cmpxchg_long_func = func;
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257 return (*func)(exchange_value, dest, compare_value);
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258 }
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259 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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260
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261 jlong old_value = *dest;
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262 if (old_value == compare_value)
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263 *dest = exchange_value;
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264 return old_value;
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265 }
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266
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267 #ifdef AMD64
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268
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269 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
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270 // try to use the stub:
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271 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
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272
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273 if (func != NULL) {
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274 os::atomic_add_func = func;
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275 return (*func)(add_value, dest);
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276 }
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277 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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278
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279 return (*dest) += add_value;
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280 }
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281
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282 intptr_t os::atomic_add_ptr_bootstrap(intptr_t add_value, volatile intptr_t* dest) {
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283 // try to use the stub:
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284 add_ptr_func_t* func = CAST_TO_FN_PTR(add_ptr_func_t*, StubRoutines::atomic_add_ptr_entry());
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285
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286 if (func != NULL) {
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287 os::atomic_add_ptr_func = func;
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288 return (*func)(add_value, dest);
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289 }
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290 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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291
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292 return (*dest) += add_value;
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293 }
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294
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295 void os::fence_bootstrap() {
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296 // try to use the stub:
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297 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
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298
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299 if (func != NULL) {
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300 os::fence_func = func;
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301 (*func)();
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302 return;
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303 }
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304 assert(Threads::number_of_threads() == 0, "for bootstrap only");
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305
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306 // don't have to do anything for a single thread
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307 }
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308
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309
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310 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
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311 xchg_ptr_func_t* os::atomic_xchg_ptr_func = os::atomic_xchg_ptr_bootstrap;
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312 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
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313 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
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314 add_ptr_func_t* os::atomic_add_ptr_func = os::atomic_add_ptr_bootstrap;
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315 fence_func_t* os::fence_func = os::fence_bootstrap;
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316
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317 #endif // AMD64
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318
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319 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
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320
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321 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
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322 intptr_t** ret_sp, intptr_t** ret_fp) {
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323
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324 ExtendedPC epc;
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325 CONTEXT* uc = (CONTEXT*)ucVoid;
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326
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327 if (uc != NULL) {
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328 epc = ExtendedPC((address)uc->REG_PC);
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329 if (ret_sp) *ret_sp = (intptr_t*)uc->REG_SP;
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330 if (ret_fp) *ret_fp = (intptr_t*)uc->REG_FP;
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331 } else {
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332 // construct empty ExtendedPC for return value checking
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333 epc = ExtendedPC(NULL);
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334 if (ret_sp) *ret_sp = (intptr_t *)NULL;
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335 if (ret_fp) *ret_fp = (intptr_t *)NULL;
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336 }
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337
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338 return epc;
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339 }
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340
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341 frame os::fetch_frame_from_context(void* ucVoid) {
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342 intptr_t* sp;
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343 intptr_t* fp;
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344 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
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345 return frame(sp, fp, epc.pc());
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346 }
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347
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348 // VC++ does not save frame pointer on stack in optimized build. It
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349 // can be turned off by /Oy-. If we really want to walk C frames,
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350 // we can use the StackWalk() API.
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351 frame os::get_sender_for_C_frame(frame* fr) {
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352 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
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353 }
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354
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355
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356 #ifndef AMD64
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357 intptr_t* _get_previous_fp() {
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358 intptr_t **frameptr;
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359 __asm {
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360 mov frameptr, ebp
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361 };
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362 return *frameptr;
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363 }
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364 #endif // !AMD64
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365
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366 frame os::current_frame() {
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367
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368 #ifdef AMD64
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369 // apparently _asm not supported on windows amd64
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370 typedef intptr_t* get_fp_func ();
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371 get_fp_func* func = CAST_TO_FN_PTR(get_fp_func*,
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304
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372 StubRoutines::x86::get_previous_fp_entry());
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0
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373 if (func == NULL) return frame(NULL, NULL, NULL);
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374 intptr_t* fp = (*func)();
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375 #else
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376 intptr_t* fp = _get_previous_fp();
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377 #endif // AMD64
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378
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379 frame myframe((intptr_t*)os::current_stack_pointer(),
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380 (intptr_t*)fp,
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381 CAST_FROM_FN_PTR(address, os::current_frame));
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382 if (os::is_first_C_frame(&myframe)) {
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383 // stack is not walkable
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384 return frame(NULL, NULL, NULL);
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385 } else {
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386 return os::get_sender_for_C_frame(&myframe);
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387 }
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388 }
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389
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390 void os::print_context(outputStream *st, void *context) {
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391 if (context == NULL) return;
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392
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393 CONTEXT* uc = (CONTEXT*)context;
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394
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395 st->print_cr("Registers:");
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396 #ifdef AMD64
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397 st->print( "EAX=" INTPTR_FORMAT, uc->Rax);
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398 st->print(", EBX=" INTPTR_FORMAT, uc->Rbx);
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399 st->print(", ECX=" INTPTR_FORMAT, uc->Rcx);
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400 st->print(", EDX=" INTPTR_FORMAT, uc->Rdx);
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401 st->cr();
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402 st->print( "ESP=" INTPTR_FORMAT, uc->Rsp);
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403 st->print(", EBP=" INTPTR_FORMAT, uc->Rbp);
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404 st->print(", ESI=" INTPTR_FORMAT, uc->Rsi);
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405 st->print(", EDI=" INTPTR_FORMAT, uc->Rdi);
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406 st->cr();
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407 st->print( "EIP=" INTPTR_FORMAT, uc->Rip);
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408 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
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409 #else
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410 st->print( "EAX=" INTPTR_FORMAT, uc->Eax);
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411 st->print(", EBX=" INTPTR_FORMAT, uc->Ebx);
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412 st->print(", ECX=" INTPTR_FORMAT, uc->Ecx);
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413 st->print(", EDX=" INTPTR_FORMAT, uc->Edx);
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414 st->cr();
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415 st->print( "ESP=" INTPTR_FORMAT, uc->Esp);
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416 st->print(", EBP=" INTPTR_FORMAT, uc->Ebp);
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417 st->print(", ESI=" INTPTR_FORMAT, uc->Esi);
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418 st->print(", EDI=" INTPTR_FORMAT, uc->Edi);
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419 st->cr();
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420 st->print( "EIP=" INTPTR_FORMAT, uc->Eip);
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421 st->print(", EFLAGS=" INTPTR_FORMAT, uc->EFlags);
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422 #endif // AMD64
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423 st->cr();
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424 st->cr();
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425
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426 intptr_t *sp = (intptr_t *)uc->REG_SP;
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427 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
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428 print_hex_dump(st, (address)sp, (address)(sp + 32), sizeof(intptr_t));
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429 st->cr();
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430
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431 // Note: it may be unsafe to inspect memory near pc. For example, pc may
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432 // point to garbage if entry point in an nmethod is corrupted. Leave
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433 // this at the end, and hope for the best.
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434 address pc = (address)uc->REG_PC;
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435 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
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436 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
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437 st->cr();
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438 }
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439
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440 extern "C" int SafeFetch32 (int * adr, int Err) {
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441 int rv = Err ;
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442 _try {
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443 rv = *((volatile int *) adr) ;
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444 } __except(EXCEPTION_EXECUTE_HANDLER) {
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445 }
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446 return rv ;
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447 }
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448
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449 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t Err) {
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450 intptr_t rv = Err ;
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451 _try {
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452 rv = *((volatile intptr_t *) adr) ;
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453 } __except(EXCEPTION_EXECUTE_HANDLER) {
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454 }
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455 return rv ;
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456 }
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457
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458 extern "C" int SpinPause () {
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459 #ifdef AMD64
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460 return 0 ;
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461 #else
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462 // pause == rep:nop
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463 // On systems that don't support pause a rep:nop
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464 // is executed as a nop. The rep: prefix is ignored.
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465 _asm {
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466 pause ;
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467 };
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468 return 1 ;
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469 #endif // AMD64
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470 }
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471
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472
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473 void os::setup_fpu() {
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474 #ifndef AMD64
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475 int fpu_cntrl_word = StubRoutines::fpu_cntrl_wrd_std();
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476 __asm fldcw fpu_cntrl_word;
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477 #endif // !AMD64
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478 }
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