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1 /* |
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2 * Copyright (c) 1999, 2011, 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 // no precompiled headers |
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26 #include "assembler_x86.inline.hpp" |
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27 #include "classfile/classLoader.hpp" |
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28 #include "classfile/systemDictionary.hpp" |
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29 #include "classfile/vmSymbols.hpp" |
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30 #include "code/icBuffer.hpp" |
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31 #include "code/vtableStubs.hpp" |
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32 #include "interpreter/interpreter.hpp" |
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33 #include "jvm_bsd.h" |
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34 #include "memory/allocation.inline.hpp" |
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35 #include "mutex_bsd.inline.hpp" |
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36 #include "nativeInst_x86.hpp" |
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37 #include "os_share_bsd.hpp" |
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38 #include "prims/jniFastGetField.hpp" |
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39 #include "prims/jvm.h" |
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40 #include "prims/jvm_misc.hpp" |
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41 #include "runtime/arguments.hpp" |
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42 #include "runtime/extendedPC.hpp" |
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43 #include "runtime/frame.inline.hpp" |
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44 #include "runtime/interfaceSupport.hpp" |
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45 #include "runtime/java.hpp" |
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46 #include "runtime/javaCalls.hpp" |
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47 #include "runtime/mutexLocker.hpp" |
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48 #include "runtime/osThread.hpp" |
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49 #include "runtime/sharedRuntime.hpp" |
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50 #include "runtime/stubRoutines.hpp" |
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51 #include "runtime/timer.hpp" |
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52 #include "thread_bsd.inline.hpp" |
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53 #include "utilities/events.hpp" |
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54 #include "utilities/vmError.hpp" |
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55 #ifdef COMPILER1 |
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56 #include "c1/c1_Runtime1.hpp" |
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57 #endif |
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58 #ifdef COMPILER2 |
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59 #include "opto/runtime.hpp" |
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60 #endif |
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61 |
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62 // put OS-includes here |
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63 # include <sys/types.h> |
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64 # include <sys/mman.h> |
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65 # include <pthread.h> |
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66 # include <signal.h> |
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67 # include <errno.h> |
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68 # include <dlfcn.h> |
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69 # include <stdlib.h> |
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70 # include <stdio.h> |
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71 # include <unistd.h> |
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72 # include <sys/resource.h> |
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73 # include <pthread.h> |
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74 # include <sys/stat.h> |
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75 # include <sys/time.h> |
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76 # include <sys/utsname.h> |
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77 # include <sys/socket.h> |
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78 # include <sys/wait.h> |
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79 # include <pwd.h> |
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80 # include <poll.h> |
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81 #ifndef __OpenBSD__ |
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82 # include <ucontext.h> |
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83 #endif |
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84 |
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85 #if defined(_ALLBSD_SOURCE) && !defined(__APPLE__) && !defined(__NetBSD__) |
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86 # include <pthread_np.h> |
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87 #endif |
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88 |
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89 #ifdef AMD64 |
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90 #define SPELL_REG_SP "rsp" |
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91 #define SPELL_REG_FP "rbp" |
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92 #else |
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93 #define SPELL_REG_SP "esp" |
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94 #define SPELL_REG_FP "ebp" |
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95 #endif // AMD64 |
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96 |
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97 #ifdef __FreeBSD__ |
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98 # define context_trapno uc_mcontext.mc_trapno |
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99 # ifdef AMD64 |
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100 # define context_pc uc_mcontext.mc_rip |
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101 # define context_sp uc_mcontext.mc_rsp |
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102 # define context_fp uc_mcontext.mc_rbp |
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103 # define context_rip uc_mcontext.mc_rip |
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104 # define context_rsp uc_mcontext.mc_rsp |
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105 # define context_rbp uc_mcontext.mc_rbp |
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106 # define context_rax uc_mcontext.mc_rax |
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107 # define context_rbx uc_mcontext.mc_rbx |
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108 # define context_rcx uc_mcontext.mc_rcx |
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109 # define context_rdx uc_mcontext.mc_rdx |
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110 # define context_rsi uc_mcontext.mc_rsi |
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111 # define context_rdi uc_mcontext.mc_rdi |
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112 # define context_r8 uc_mcontext.mc_r8 |
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113 # define context_r9 uc_mcontext.mc_r9 |
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114 # define context_r10 uc_mcontext.mc_r10 |
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115 # define context_r11 uc_mcontext.mc_r11 |
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116 # define context_r12 uc_mcontext.mc_r12 |
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117 # define context_r13 uc_mcontext.mc_r13 |
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118 # define context_r14 uc_mcontext.mc_r14 |
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119 # define context_r15 uc_mcontext.mc_r15 |
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120 # define context_flags uc_mcontext.mc_flags |
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121 # define context_err uc_mcontext.mc_err |
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122 # else |
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123 # define context_pc uc_mcontext.mc_eip |
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124 # define context_sp uc_mcontext.mc_esp |
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125 # define context_fp uc_mcontext.mc_ebp |
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126 # define context_eip uc_mcontext.mc_eip |
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127 # define context_esp uc_mcontext.mc_esp |
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128 # define context_eax uc_mcontext.mc_eax |
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129 # define context_ebx uc_mcontext.mc_ebx |
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130 # define context_ecx uc_mcontext.mc_ecx |
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131 # define context_edx uc_mcontext.mc_edx |
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132 # define context_ebp uc_mcontext.mc_ebp |
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133 # define context_esi uc_mcontext.mc_esi |
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134 # define context_edi uc_mcontext.mc_edi |
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135 # define context_eflags uc_mcontext.mc_eflags |
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136 # define context_trapno uc_mcontext.mc_trapno |
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137 # endif |
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138 #endif |
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139 |
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140 #ifdef __APPLE__ |
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141 # if __DARWIN_UNIX03 && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5) |
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142 // 10.5 UNIX03 member name prefixes |
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143 #define DU3_PREFIX(s, m) __ ## s.__ ## m |
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144 # else |
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145 #define DU3_PREFIX(s, m) s ## . ## m |
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146 # endif |
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147 |
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148 # ifdef AMD64 |
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149 # define context_pc context_rip |
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150 # define context_sp context_rsp |
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151 # define context_fp context_rbp |
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152 # define context_rip uc_mcontext->DU3_PREFIX(ss,rip) |
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153 # define context_rsp uc_mcontext->DU3_PREFIX(ss,rsp) |
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154 # define context_rax uc_mcontext->DU3_PREFIX(ss,rax) |
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155 # define context_rbx uc_mcontext->DU3_PREFIX(ss,rbx) |
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156 # define context_rcx uc_mcontext->DU3_PREFIX(ss,rcx) |
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157 # define context_rdx uc_mcontext->DU3_PREFIX(ss,rdx) |
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158 # define context_rbp uc_mcontext->DU3_PREFIX(ss,rbp) |
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159 # define context_rsi uc_mcontext->DU3_PREFIX(ss,rsi) |
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160 # define context_rdi uc_mcontext->DU3_PREFIX(ss,rdi) |
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161 # define context_r8 uc_mcontext->DU3_PREFIX(ss,r8) |
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162 # define context_r9 uc_mcontext->DU3_PREFIX(ss,r9) |
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163 # define context_r10 uc_mcontext->DU3_PREFIX(ss,r10) |
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164 # define context_r11 uc_mcontext->DU3_PREFIX(ss,r11) |
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165 # define context_r12 uc_mcontext->DU3_PREFIX(ss,r12) |
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166 # define context_r13 uc_mcontext->DU3_PREFIX(ss,r13) |
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167 # define context_r14 uc_mcontext->DU3_PREFIX(ss,r14) |
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168 # define context_r15 uc_mcontext->DU3_PREFIX(ss,r15) |
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169 # define context_flags uc_mcontext->DU3_PREFIX(ss,rflags) |
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170 # define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) |
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171 # define context_err uc_mcontext->DU3_PREFIX(es,err) |
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172 # else |
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173 # define context_pc context_eip |
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174 # define context_sp context_esp |
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175 # define context_fp context_ebp |
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176 # define context_eip uc_mcontext->DU3_PREFIX(ss,eip) |
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177 # define context_esp uc_mcontext->DU3_PREFIX(ss,esp) |
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178 # define context_eax uc_mcontext->DU3_PREFIX(ss,eax) |
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179 # define context_ebx uc_mcontext->DU3_PREFIX(ss,ebx) |
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180 # define context_ecx uc_mcontext->DU3_PREFIX(ss,ecx) |
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181 # define context_edx uc_mcontext->DU3_PREFIX(ss,edx) |
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182 # define context_ebp uc_mcontext->DU3_PREFIX(ss,ebp) |
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183 # define context_esi uc_mcontext->DU3_PREFIX(ss,esi) |
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184 # define context_edi uc_mcontext->DU3_PREFIX(ss,edi) |
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185 # define context_eflags uc_mcontext->DU3_PREFIX(ss,eflags) |
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186 # define context_trapno uc_mcontext->DU3_PREFIX(es,trapno) |
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187 # endif |
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188 #endif |
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189 |
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190 #ifdef __OpenBSD__ |
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191 # define context_trapno sc_trapno |
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192 # ifdef AMD64 |
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193 # define context_pc sc_rip |
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194 # define context_sp sc_rsp |
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195 # define context_fp sc_rbp |
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196 # define context_rip sc_rip |
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197 # define context_rsp sc_rsp |
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198 # define context_rbp sc_rbp |
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199 # define context_rax sc_rax |
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200 # define context_rbx sc_rbx |
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201 # define context_rcx sc_rcx |
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202 # define context_rdx sc_rdx |
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203 # define context_rsi sc_rsi |
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204 # define context_rdi sc_rdi |
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205 # define context_r8 sc_r8 |
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206 # define context_r9 sc_r9 |
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207 # define context_r10 sc_r10 |
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208 # define context_r11 sc_r11 |
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209 # define context_r12 sc_r12 |
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210 # define context_r13 sc_r13 |
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211 # define context_r14 sc_r14 |
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212 # define context_r15 sc_r15 |
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213 # define context_flags sc_rflags |
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214 # define context_err sc_err |
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215 # else |
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216 # define context_pc sc_eip |
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217 # define context_sp sc_esp |
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218 # define context_fp sc_ebp |
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219 # define context_eip sc_eip |
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220 # define context_esp sc_esp |
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221 # define context_eax sc_eax |
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222 # define context_ebx sc_ebx |
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223 # define context_ecx sc_ecx |
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224 # define context_edx sc_edx |
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225 # define context_ebp sc_ebp |
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226 # define context_esi sc_esi |
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227 # define context_edi sc_edi |
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228 # define context_eflags sc_eflags |
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229 # define context_trapno sc_trapno |
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230 # endif |
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231 #endif |
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232 |
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233 #ifdef __NetBSD__ |
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234 # define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] |
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235 # ifdef AMD64 |
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236 # define __register_t __greg_t |
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237 # define context_pc uc_mcontext.__gregs[_REG_RIP] |
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238 # define context_sp uc_mcontext.__gregs[_REG_URSP] |
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239 # define context_fp uc_mcontext.__gregs[_REG_RBP] |
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240 # define context_rip uc_mcontext.__gregs[_REG_RIP] |
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241 # define context_rsp uc_mcontext.__gregs[_REG_URSP] |
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242 # define context_rax uc_mcontext.__gregs[_REG_RAX] |
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243 # define context_rbx uc_mcontext.__gregs[_REG_RBX] |
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244 # define context_rcx uc_mcontext.__gregs[_REG_RCX] |
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245 # define context_rdx uc_mcontext.__gregs[_REG_RDX] |
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246 # define context_rbp uc_mcontext.__gregs[_REG_RBP] |
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247 # define context_rsi uc_mcontext.__gregs[_REG_RSI] |
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248 # define context_rdi uc_mcontext.__gregs[_REG_RDI] |
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249 # define context_r8 uc_mcontext.__gregs[_REG_R8] |
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250 # define context_r9 uc_mcontext.__gregs[_REG_R9] |
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251 # define context_r10 uc_mcontext.__gregs[_REG_R10] |
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252 # define context_r11 uc_mcontext.__gregs[_REG_R11] |
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253 # define context_r12 uc_mcontext.__gregs[_REG_R12] |
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254 # define context_r13 uc_mcontext.__gregs[_REG_R13] |
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255 # define context_r14 uc_mcontext.__gregs[_REG_R14] |
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256 # define context_r15 uc_mcontext.__gregs[_REG_R15] |
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257 # define context_flags uc_mcontext.__gregs[_REG_RFL] |
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258 # define context_err uc_mcontext.__gregs[_REG_ERR] |
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259 # else |
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260 # define context_pc uc_mcontext.__gregs[_REG_EIP] |
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261 # define context_sp uc_mcontext.__gregs[_REG_UESP] |
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262 # define context_fp uc_mcontext.__gregs[_REG_EBP] |
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263 # define context_eip uc_mcontext.__gregs[_REG_EIP] |
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264 # define context_esp uc_mcontext.__gregs[_REG_UESP] |
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265 # define context_eax uc_mcontext.__gregs[_REG_EAX] |
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266 # define context_ebx uc_mcontext.__gregs[_REG_EBX] |
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267 # define context_ecx uc_mcontext.__gregs[_REG_ECX] |
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268 # define context_edx uc_mcontext.__gregs[_REG_EDX] |
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269 # define context_ebp uc_mcontext.__gregs[_REG_EBP] |
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270 # define context_esi uc_mcontext.__gregs[_REG_ESI] |
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271 # define context_edi uc_mcontext.__gregs[_REG_EDI] |
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272 # define context_eflags uc_mcontext.__gregs[_REG_EFL] |
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273 # define context_trapno uc_mcontext.__gregs[_REG_TRAPNO] |
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274 # endif |
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275 #endif |
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276 |
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277 address os::current_stack_pointer() { |
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278 #ifdef SPARC_WORKS |
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279 register void *esp; |
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280 __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp)); |
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281 return (address) ((char*)esp + sizeof(long)*2); |
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282 #else |
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283 register void *esp __asm__ (SPELL_REG_SP); |
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284 return (address) esp; |
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285 #endif |
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286 } |
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287 |
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288 char* os::non_memory_address_word() { |
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289 // Must never look like an address returned by reserve_memory, |
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290 // even in its subfields (as defined by the CPU immediate fields, |
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291 // if the CPU splits constants across multiple instructions). |
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292 |
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293 return (char*) -1; |
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294 } |
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295 |
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296 void os::initialize_thread() { |
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297 // Nothing to do. |
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298 } |
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299 |
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300 address os::Bsd::ucontext_get_pc(ucontext_t * uc) { |
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301 return (address)uc->context_pc; |
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302 } |
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303 |
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304 intptr_t* os::Bsd::ucontext_get_sp(ucontext_t * uc) { |
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305 return (intptr_t*)uc->context_sp; |
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306 } |
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307 |
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308 intptr_t* os::Bsd::ucontext_get_fp(ucontext_t * uc) { |
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309 return (intptr_t*)uc->context_fp; |
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310 } |
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311 |
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312 // For Forte Analyzer AsyncGetCallTrace profiling support - thread |
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313 // is currently interrupted by SIGPROF. |
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314 // os::Solaris::fetch_frame_from_ucontext() tries to skip nested signal |
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315 // frames. Currently we don't do that on Bsd, so it's the same as |
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316 // os::fetch_frame_from_context(). |
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317 ExtendedPC os::Bsd::fetch_frame_from_ucontext(Thread* thread, |
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318 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) { |
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319 |
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320 assert(thread != NULL, "just checking"); |
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321 assert(ret_sp != NULL, "just checking"); |
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322 assert(ret_fp != NULL, "just checking"); |
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323 |
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324 return os::fetch_frame_from_context(uc, ret_sp, ret_fp); |
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325 } |
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326 |
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327 ExtendedPC os::fetch_frame_from_context(void* ucVoid, |
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328 intptr_t** ret_sp, intptr_t** ret_fp) { |
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329 |
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330 ExtendedPC epc; |
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331 ucontext_t* uc = (ucontext_t*)ucVoid; |
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332 |
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333 if (uc != NULL) { |
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334 epc = ExtendedPC(os::Bsd::ucontext_get_pc(uc)); |
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335 if (ret_sp) *ret_sp = os::Bsd::ucontext_get_sp(uc); |
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336 if (ret_fp) *ret_fp = os::Bsd::ucontext_get_fp(uc); |
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337 } else { |
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338 // construct empty ExtendedPC for return value checking |
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339 epc = ExtendedPC(NULL); |
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340 if (ret_sp) *ret_sp = (intptr_t *)NULL; |
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341 if (ret_fp) *ret_fp = (intptr_t *)NULL; |
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342 } |
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343 |
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344 return epc; |
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345 } |
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346 |
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347 frame os::fetch_frame_from_context(void* ucVoid) { |
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348 intptr_t* sp; |
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349 intptr_t* fp; |
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350 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp); |
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351 return frame(sp, fp, epc.pc()); |
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352 } |
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353 |
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354 // By default, gcc always save frame pointer (%ebp/%rbp) on stack. It may get |
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355 // turned off by -fomit-frame-pointer, |
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356 frame os::get_sender_for_C_frame(frame* fr) { |
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357 return frame(fr->sender_sp(), fr->link(), fr->sender_pc()); |
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358 } |
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359 |
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360 intptr_t* _get_previous_fp() { |
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361 #ifdef SPARC_WORKS |
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362 register intptr_t **ebp; |
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363 __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp)); |
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364 #else |
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365 register intptr_t **ebp __asm__ (SPELL_REG_FP); |
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366 #endif |
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367 return (intptr_t*) *ebp; // we want what it points to. |
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368 } |
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369 |
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370 |
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371 frame os::current_frame() { |
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372 intptr_t* fp = _get_previous_fp(); |
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373 frame myframe((intptr_t*)os::current_stack_pointer(), |
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374 (intptr_t*)fp, |
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375 CAST_FROM_FN_PTR(address, os::current_frame)); |
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376 if (os::is_first_C_frame(&myframe)) { |
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377 // stack is not walkable |
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378 return frame(NULL, NULL, NULL); |
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379 } else { |
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380 return os::get_sender_for_C_frame(&myframe); |
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381 } |
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382 } |
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383 |
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384 // Utility functions |
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385 |
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386 // From IA32 System Programming Guide |
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387 enum { |
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388 trap_page_fault = 0xE |
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389 }; |
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390 |
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391 extern "C" void Fetch32PFI () ; |
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392 extern "C" void Fetch32Resume () ; |
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393 #ifdef AMD64 |
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394 extern "C" void FetchNPFI () ; |
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395 extern "C" void FetchNResume () ; |
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396 #endif // AMD64 |
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397 |
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398 extern "C" JNIEXPORT int |
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399 JVM_handle_bsd_signal(int sig, |
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400 siginfo_t* info, |
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401 void* ucVoid, |
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402 int abort_if_unrecognized) { |
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403 ucontext_t* uc = (ucontext_t*) ucVoid; |
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404 |
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405 Thread* t = ThreadLocalStorage::get_thread_slow(); |
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406 |
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407 SignalHandlerMark shm(t); |
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408 |
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409 // Note: it's not uncommon that JNI code uses signal/sigset to install |
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410 // then restore certain signal handler (e.g. to temporarily block SIGPIPE, |
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411 // or have a SIGILL handler when detecting CPU type). When that happens, |
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412 // JVM_handle_bsd_signal() might be invoked with junk info/ucVoid. To |
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413 // avoid unnecessary crash when libjsig is not preloaded, try handle signals |
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414 // that do not require siginfo/ucontext first. |
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415 |
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416 if (sig == SIGPIPE || sig == SIGXFSZ) { |
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417 // allow chained handler to go first |
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418 if (os::Bsd::chained_handler(sig, info, ucVoid)) { |
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419 return true; |
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420 } else { |
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421 if (PrintMiscellaneous && (WizardMode || Verbose)) { |
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422 char buf[64]; |
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423 warning("Ignoring %s - see bugs 4229104 or 646499219", |
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424 os::exception_name(sig, buf, sizeof(buf))); |
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425 } |
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426 return true; |
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427 } |
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428 } |
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429 |
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430 JavaThread* thread = NULL; |
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431 VMThread* vmthread = NULL; |
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432 if (os::Bsd::signal_handlers_are_installed) { |
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433 if (t != NULL ){ |
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434 if(t->is_Java_thread()) { |
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435 thread = (JavaThread*)t; |
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436 } |
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437 else if(t->is_VM_thread()){ |
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438 vmthread = (VMThread *)t; |
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439 } |
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440 } |
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441 } |
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442 /* |
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443 NOTE: does not seem to work on bsd. |
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444 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) { |
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445 // can't decode this kind of signal |
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446 info = NULL; |
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447 } else { |
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448 assert(sig == info->si_signo, "bad siginfo"); |
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449 } |
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450 */ |
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451 // decide if this trap can be handled by a stub |
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452 address stub = NULL; |
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453 |
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454 address pc = NULL; |
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455 |
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456 //%note os_trap_1 |
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457 if (info != NULL && uc != NULL && thread != NULL) { |
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458 pc = (address) os::Bsd::ucontext_get_pc(uc); |
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459 |
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460 if (pc == (address) Fetch32PFI) { |
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461 uc->context_pc = intptr_t(Fetch32Resume) ; |
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462 return 1 ; |
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463 } |
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464 #ifdef AMD64 |
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465 if (pc == (address) FetchNPFI) { |
|
466 uc->context_pc = intptr_t (FetchNResume) ; |
|
467 return 1 ; |
|
468 } |
|
469 #endif // AMD64 |
|
470 |
|
471 // Handle ALL stack overflow variations here |
|
472 if (sig == SIGSEGV || sig == SIGBUS) { |
|
473 address addr = (address) info->si_addr; |
|
474 |
|
475 // check if fault address is within thread stack |
|
476 if (addr < thread->stack_base() && |
|
477 addr >= thread->stack_base() - thread->stack_size()) { |
|
478 // stack overflow |
|
479 if (thread->in_stack_yellow_zone(addr)) { |
|
480 thread->disable_stack_yellow_zone(); |
|
481 if (thread->thread_state() == _thread_in_Java) { |
|
482 // Throw a stack overflow exception. Guard pages will be reenabled |
|
483 // while unwinding the stack. |
|
484 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW); |
|
485 } else { |
|
486 // Thread was in the vm or native code. Return and try to finish. |
|
487 return 1; |
|
488 } |
|
489 } else if (thread->in_stack_red_zone(addr)) { |
|
490 // Fatal red zone violation. Disable the guard pages and fall through |
|
491 // to handle_unexpected_exception way down below. |
|
492 thread->disable_stack_red_zone(); |
|
493 tty->print_raw_cr("An irrecoverable stack overflow has occurred."); |
|
494 #ifndef _ALLBSD_SOURCE |
|
495 } else { |
|
496 // Accessing stack address below sp may cause SEGV if current |
|
497 // thread has MAP_GROWSDOWN stack. This should only happen when |
|
498 // current thread was created by user code with MAP_GROWSDOWN flag |
|
499 // and then attached to VM. See notes in os_bsd.cpp. |
|
500 if (thread->osthread()->expanding_stack() == 0) { |
|
501 thread->osthread()->set_expanding_stack(); |
|
502 if (os::Bsd::manually_expand_stack(thread, addr)) { |
|
503 thread->osthread()->clear_expanding_stack(); |
|
504 return 1; |
|
505 } |
|
506 thread->osthread()->clear_expanding_stack(); |
|
507 } else { |
|
508 fatal("recursive segv. expanding stack."); |
|
509 } |
|
510 #endif |
|
511 } |
|
512 } |
|
513 } |
|
514 |
|
515 if (thread->thread_state() == _thread_in_Java) { |
|
516 // Java thread running in Java code => find exception handler if any |
|
517 // a fault inside compiled code, the interpreter, or a stub |
|
518 |
|
519 if ((sig == SIGSEGV || sig == SIGBUS) && os::is_poll_address((address)info->si_addr)) { |
|
520 stub = SharedRuntime::get_poll_stub(pc); |
|
521 #if defined(__APPLE__) && !defined(AMD64) |
|
522 // 32-bit Darwin reports a SIGBUS for nearly all memory access exceptions. |
|
523 // Catching SIGBUS here prevents the implicit SIGBUS NULL check below from |
|
524 // being called, so only do so if the implicit NULL check is not necessary. |
|
525 } else if (sig == SIGBUS && MacroAssembler::needs_explicit_null_check((int)info->si_addr)) { |
|
526 #else |
|
527 } else if (sig == SIGBUS /* && info->si_code == BUS_OBJERR */) { |
|
528 #endif |
|
529 // BugId 4454115: A read from a MappedByteBuffer can fault |
|
530 // here if the underlying file has been truncated. |
|
531 // Do not crash the VM in such a case. |
|
532 CodeBlob* cb = CodeCache::find_blob_unsafe(pc); |
|
533 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL; |
|
534 if (nm != NULL && nm->has_unsafe_access()) { |
|
535 stub = StubRoutines::handler_for_unsafe_access(); |
|
536 } |
|
537 } |
|
538 else |
|
539 |
|
540 #ifdef AMD64 |
|
541 if (sig == SIGFPE && |
|
542 (info->si_code == FPE_INTDIV || info->si_code == FPE_FLTDIV)) { |
|
543 stub = |
|
544 SharedRuntime:: |
|
545 continuation_for_implicit_exception(thread, |
|
546 pc, |
|
547 SharedRuntime:: |
|
548 IMPLICIT_DIVIDE_BY_ZERO); |
|
549 #ifdef __APPLE__ |
|
550 } else if (sig == SIGFPE && info->si_code == FPE_NOOP) { |
|
551 int op = pc[0]; |
|
552 |
|
553 // Skip REX |
|
554 if ((pc[0] & 0xf0) == 0x40) { |
|
555 op = pc[1]; |
|
556 } else { |
|
557 op = pc[0]; |
|
558 } |
|
559 |
|
560 // Check for IDIV |
|
561 if (op == 0xF7) { |
|
562 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime:: IMPLICIT_DIVIDE_BY_ZERO); |
|
563 } else { |
|
564 // TODO: handle more cases if we are using other x86 instructions |
|
565 // that can generate SIGFPE signal. |
|
566 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); |
|
567 fatal("please update this code."); |
|
568 } |
|
569 #endif /* __APPLE__ */ |
|
570 |
|
571 #else |
|
572 if (sig == SIGFPE /* && info->si_code == FPE_INTDIV */) { |
|
573 // HACK: si_code does not work on bsd 2.2.12-20!!! |
|
574 int op = pc[0]; |
|
575 if (op == 0xDB) { |
|
576 // FIST |
|
577 // TODO: The encoding of D2I in i486.ad can cause an exception |
|
578 // prior to the fist instruction if there was an invalid operation |
|
579 // pending. We want to dismiss that exception. From the win_32 |
|
580 // side it also seems that if it really was the fist causing |
|
581 // the exception that we do the d2i by hand with different |
|
582 // rounding. Seems kind of weird. |
|
583 // NOTE: that we take the exception at the NEXT floating point instruction. |
|
584 assert(pc[0] == 0xDB, "not a FIST opcode"); |
|
585 assert(pc[1] == 0x14, "not a FIST opcode"); |
|
586 assert(pc[2] == 0x24, "not a FIST opcode"); |
|
587 return true; |
|
588 } else if (op == 0xF7) { |
|
589 // IDIV |
|
590 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO); |
|
591 } else { |
|
592 // TODO: handle more cases if we are using other x86 instructions |
|
593 // that can generate SIGFPE signal on bsd. |
|
594 tty->print_cr("unknown opcode 0x%X with SIGFPE.", op); |
|
595 fatal("please update this code."); |
|
596 } |
|
597 #endif // AMD64 |
|
598 } else if ((sig == SIGSEGV || sig == SIGBUS) && |
|
599 !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) { |
|
600 // Determination of interpreter/vtable stub/compiled code null exception |
|
601 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL); |
|
602 } |
|
603 } else if (thread->thread_state() == _thread_in_vm && |
|
604 sig == SIGBUS && /* info->si_code == BUS_OBJERR && */ |
|
605 thread->doing_unsafe_access()) { |
|
606 stub = StubRoutines::handler_for_unsafe_access(); |
|
607 } |
|
608 |
|
609 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in |
|
610 // and the heap gets shrunk before the field access. |
|
611 if ((sig == SIGSEGV) || (sig == SIGBUS)) { |
|
612 address addr = JNI_FastGetField::find_slowcase_pc(pc); |
|
613 if (addr != (address)-1) { |
|
614 stub = addr; |
|
615 } |
|
616 } |
|
617 |
|
618 // Check to see if we caught the safepoint code in the |
|
619 // process of write protecting the memory serialization page. |
|
620 // It write enables the page immediately after protecting it |
|
621 // so we can just return to retry the write. |
|
622 if ((sig == SIGSEGV || sig == SIGBUS) && |
|
623 os::is_memory_serialize_page(thread, (address) info->si_addr)) { |
|
624 // Block current thread until the memory serialize page permission restored. |
|
625 os::block_on_serialize_page_trap(); |
|
626 return true; |
|
627 } |
|
628 } |
|
629 |
|
630 #ifndef AMD64 |
|
631 // Execution protection violation |
|
632 // |
|
633 // This should be kept as the last step in the triage. We don't |
|
634 // have a dedicated trap number for a no-execute fault, so be |
|
635 // conservative and allow other handlers the first shot. |
|
636 // |
|
637 // Note: We don't test that info->si_code == SEGV_ACCERR here. |
|
638 // this si_code is so generic that it is almost meaningless; and |
|
639 // the si_code for this condition may change in the future. |
|
640 // Furthermore, a false-positive should be harmless. |
|
641 if (UnguardOnExecutionViolation > 0 && |
|
642 (sig == SIGSEGV || sig == SIGBUS) && |
|
643 uc->context_trapno == trap_page_fault) { |
|
644 int page_size = os::vm_page_size(); |
|
645 address addr = (address) info->si_addr; |
|
646 address pc = os::Bsd::ucontext_get_pc(uc); |
|
647 // Make sure the pc and the faulting address are sane. |
|
648 // |
|
649 // If an instruction spans a page boundary, and the page containing |
|
650 // the beginning of the instruction is executable but the following |
|
651 // page is not, the pc and the faulting address might be slightly |
|
652 // different - we still want to unguard the 2nd page in this case. |
|
653 // |
|
654 // 15 bytes seems to be a (very) safe value for max instruction size. |
|
655 bool pc_is_near_addr = |
|
656 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15); |
|
657 bool instr_spans_page_boundary = |
|
658 (align_size_down((intptr_t) pc ^ (intptr_t) addr, |
|
659 (intptr_t) page_size) > 0); |
|
660 |
|
661 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) { |
|
662 static volatile address last_addr = |
|
663 (address) os::non_memory_address_word(); |
|
664 |
|
665 // In conservative mode, don't unguard unless the address is in the VM |
|
666 if (addr != last_addr && |
|
667 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) { |
|
668 |
|
669 // Set memory to RWX and retry |
|
670 address page_start = |
|
671 (address) align_size_down((intptr_t) addr, (intptr_t) page_size); |
|
672 bool res = os::protect_memory((char*) page_start, page_size, |
|
673 os::MEM_PROT_RWX); |
|
674 |
|
675 if (PrintMiscellaneous && Verbose) { |
|
676 char buf[256]; |
|
677 jio_snprintf(buf, sizeof(buf), "Execution protection violation " |
|
678 "at " INTPTR_FORMAT |
|
679 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr, |
|
680 page_start, (res ? "success" : "failed"), errno); |
|
681 tty->print_raw_cr(buf); |
|
682 } |
|
683 stub = pc; |
|
684 |
|
685 // Set last_addr so if we fault again at the same address, we don't end |
|
686 // up in an endless loop. |
|
687 // |
|
688 // There are two potential complications here. Two threads trapping at |
|
689 // the same address at the same time could cause one of the threads to |
|
690 // think it already unguarded, and abort the VM. Likely very rare. |
|
691 // |
|
692 // The other race involves two threads alternately trapping at |
|
693 // different addresses and failing to unguard the page, resulting in |
|
694 // an endless loop. This condition is probably even more unlikely than |
|
695 // the first. |
|
696 // |
|
697 // Although both cases could be avoided by using locks or thread local |
|
698 // last_addr, these solutions are unnecessary complication: this |
|
699 // handler is a best-effort safety net, not a complete solution. It is |
|
700 // disabled by default and should only be used as a workaround in case |
|
701 // we missed any no-execute-unsafe VM code. |
|
702 |
|
703 last_addr = addr; |
|
704 } |
|
705 } |
|
706 } |
|
707 #endif // !AMD64 |
|
708 |
|
709 if (stub != NULL) { |
|
710 // save all thread context in case we need to restore it |
|
711 if (thread != NULL) thread->set_saved_exception_pc(pc); |
|
712 |
|
713 uc->context_pc = (intptr_t)stub; |
|
714 return true; |
|
715 } |
|
716 |
|
717 // signal-chaining |
|
718 if (os::Bsd::chained_handler(sig, info, ucVoid)) { |
|
719 return true; |
|
720 } |
|
721 |
|
722 if (!abort_if_unrecognized) { |
|
723 // caller wants another chance, so give it to him |
|
724 return false; |
|
725 } |
|
726 |
|
727 if (pc == NULL && uc != NULL) { |
|
728 pc = os::Bsd::ucontext_get_pc(uc); |
|
729 } |
|
730 |
|
731 // unmask current signal |
|
732 sigset_t newset; |
|
733 sigemptyset(&newset); |
|
734 sigaddset(&newset, sig); |
|
735 sigprocmask(SIG_UNBLOCK, &newset, NULL); |
|
736 |
|
737 VMError err(t, sig, pc, info, ucVoid); |
|
738 err.report_and_die(); |
|
739 |
|
740 ShouldNotReachHere(); |
|
741 } |
|
742 |
|
743 #ifdef _ALLBSD_SOURCE |
|
744 // From solaris_i486.s ported to bsd_i486.s |
|
745 extern "C" void fixcw(); |
|
746 #endif |
|
747 |
|
748 void os::Bsd::init_thread_fpu_state(void) { |
|
749 #ifndef AMD64 |
|
750 # ifdef _ALLBSD_SOURCE |
|
751 // Set fpu to 53 bit precision. This happens too early to use a stub. |
|
752 fixcw(); |
|
753 # else |
|
754 // set fpu to 53 bit precision |
|
755 set_fpu_control_word(0x27f); |
|
756 # endif |
|
757 #endif // !AMD64 |
|
758 } |
|
759 |
|
760 #ifndef _ALLBSD_SOURCE |
|
761 int os::Bsd::get_fpu_control_word(void) { |
|
762 #ifdef AMD64 |
|
763 return 0; |
|
764 #else |
|
765 int fpu_control; |
|
766 _FPU_GETCW(fpu_control); |
|
767 return fpu_control & 0xffff; |
|
768 #endif // AMD64 |
|
769 } |
|
770 |
|
771 void os::Bsd::set_fpu_control_word(int fpu_control) { |
|
772 #ifndef AMD64 |
|
773 _FPU_SETCW(fpu_control); |
|
774 #endif // !AMD64 |
|
775 } |
|
776 #endif |
|
777 |
|
778 // Check that the bsd kernel version is 2.4 or higher since earlier |
|
779 // versions do not support SSE without patches. |
|
780 bool os::supports_sse() { |
|
781 #if defined(AMD64) || defined(_ALLBSD_SOURCE) |
|
782 return true; |
|
783 #else |
|
784 struct utsname uts; |
|
785 if( uname(&uts) != 0 ) return false; // uname fails? |
|
786 char *minor_string; |
|
787 int major = strtol(uts.release,&minor_string,10); |
|
788 int minor = strtol(minor_string+1,NULL,10); |
|
789 bool result = (major > 2 || (major==2 && minor >= 4)); |
|
790 #ifndef PRODUCT |
|
791 if (PrintMiscellaneous && Verbose) { |
|
792 tty->print("OS version is %d.%d, which %s support SSE/SSE2\n", |
|
793 major,minor, result ? "DOES" : "does NOT"); |
|
794 } |
|
795 #endif |
|
796 return result; |
|
797 #endif // AMD64 |
|
798 } |
|
799 |
|
800 bool os::is_allocatable(size_t bytes) { |
|
801 #ifdef AMD64 |
|
802 // unused on amd64? |
|
803 return true; |
|
804 #else |
|
805 |
|
806 if (bytes < 2 * G) { |
|
807 return true; |
|
808 } |
|
809 |
|
810 char* addr = reserve_memory(bytes, NULL); |
|
811 |
|
812 if (addr != NULL) { |
|
813 release_memory(addr, bytes); |
|
814 } |
|
815 |
|
816 return addr != NULL; |
|
817 #endif // AMD64 |
|
818 } |
|
819 |
|
820 //////////////////////////////////////////////////////////////////////////////// |
|
821 // thread stack |
|
822 |
|
823 #ifdef AMD64 |
|
824 size_t os::Bsd::min_stack_allowed = 64 * K; |
|
825 |
|
826 // amd64: pthread on amd64 is always in floating stack mode |
|
827 bool os::Bsd::supports_variable_stack_size() { return true; } |
|
828 #else |
|
829 size_t os::Bsd::min_stack_allowed = (48 DEBUG_ONLY(+4))*K; |
|
830 |
|
831 #ifdef __GNUC__ |
|
832 #define GET_GS() ({int gs; __asm__ volatile("movw %%gs, %w0":"=q"(gs)); gs&0xffff;}) |
|
833 #endif |
|
834 |
|
835 #ifdef _ALLBSD_SOURCE |
|
836 bool os::Bsd::supports_variable_stack_size() { return true; } |
|
837 #else |
|
838 // Test if pthread library can support variable thread stack size. BsdThreads |
|
839 // in fixed stack mode allocates 2M fixed slot for each thread. BsdThreads |
|
840 // in floating stack mode and NPTL support variable stack size. |
|
841 bool os::Bsd::supports_variable_stack_size() { |
|
842 if (os::Bsd::is_NPTL()) { |
|
843 // NPTL, yes |
|
844 return true; |
|
845 |
|
846 } else { |
|
847 // Note: We can't control default stack size when creating a thread. |
|
848 // If we use non-default stack size (pthread_attr_setstacksize), both |
|
849 // floating stack and non-floating stack BsdThreads will return the |
|
850 // same value. This makes it impossible to implement this function by |
|
851 // detecting thread stack size directly. |
|
852 // |
|
853 // An alternative approach is to check %gs. Fixed-stack BsdThreads |
|
854 // do not use %gs, so its value is 0. Floating-stack BsdThreads use |
|
855 // %gs (either as LDT selector or GDT selector, depending on kernel) |
|
856 // to access thread specific data. |
|
857 // |
|
858 // Note that %gs is a reserved glibc register since early 2001, so |
|
859 // applications are not allowed to change its value (Ulrich Drepper from |
|
860 // Redhat confirmed that all known offenders have been modified to use |
|
861 // either %fs or TSD). In the worst case scenario, when VM is embedded in |
|
862 // a native application that plays with %gs, we might see non-zero %gs |
|
863 // even BsdThreads is running in fixed stack mode. As the result, we'll |
|
864 // return true and skip _thread_safety_check(), so we may not be able to |
|
865 // detect stack-heap collisions. But otherwise it's harmless. |
|
866 // |
|
867 #ifdef __GNUC__ |
|
868 return (GET_GS() != 0); |
|
869 #else |
|
870 return false; |
|
871 #endif |
|
872 } |
|
873 } |
|
874 #endif |
|
875 #endif // AMD64 |
|
876 |
|
877 // return default stack size for thr_type |
|
878 size_t os::Bsd::default_stack_size(os::ThreadType thr_type) { |
|
879 // default stack size (compiler thread needs larger stack) |
|
880 #ifdef AMD64 |
|
881 size_t s = (thr_type == os::compiler_thread ? 4 * M : 1 * M); |
|
882 #else |
|
883 size_t s = (thr_type == os::compiler_thread ? 2 * M : 512 * K); |
|
884 #endif // AMD64 |
|
885 return s; |
|
886 } |
|
887 |
|
888 size_t os::Bsd::default_guard_size(os::ThreadType thr_type) { |
|
889 // Creating guard page is very expensive. Java thread has HotSpot |
|
890 // guard page, only enable glibc guard page for non-Java threads. |
|
891 return (thr_type == java_thread ? 0 : page_size()); |
|
892 } |
|
893 |
|
894 // Java thread: |
|
895 // |
|
896 // Low memory addresses |
|
897 // +------------------------+ |
|
898 // | |\ JavaThread created by VM does not have glibc |
|
899 // | glibc guard page | - guard, attached Java thread usually has |
|
900 // | |/ 1 page glibc guard. |
|
901 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() |
|
902 // | |\ |
|
903 // | HotSpot Guard Pages | - red and yellow pages |
|
904 // | |/ |
|
905 // +------------------------+ JavaThread::stack_yellow_zone_base() |
|
906 // | |\ |
|
907 // | Normal Stack | - |
|
908 // | |/ |
|
909 // P2 +------------------------+ Thread::stack_base() |
|
910 // |
|
911 // Non-Java thread: |
|
912 // |
|
913 // Low memory addresses |
|
914 // +------------------------+ |
|
915 // | |\ |
|
916 // | glibc guard page | - usually 1 page |
|
917 // | |/ |
|
918 // P1 +------------------------+ Thread::stack_base() - Thread::stack_size() |
|
919 // | |\ |
|
920 // | Normal Stack | - |
|
921 // | |/ |
|
922 // P2 +------------------------+ Thread::stack_base() |
|
923 // |
|
924 // ** P1 (aka bottom) and size ( P2 = P1 - size) are the address and stack size returned from |
|
925 // pthread_attr_getstack() |
|
926 |
|
927 static void current_stack_region(address * bottom, size_t * size) { |
|
928 #ifdef __APPLE__ |
|
929 pthread_t self = pthread_self(); |
|
930 void *stacktop = pthread_get_stackaddr_np(self); |
|
931 *size = pthread_get_stacksize_np(self); |
|
932 *bottom = (address) stacktop - *size; |
|
933 #elif defined(__OpenBSD__) |
|
934 stack_t ss; |
|
935 int rslt = pthread_stackseg_np(pthread_self(), &ss); |
|
936 |
|
937 if (rslt != 0) |
|
938 fatal(err_msg("pthread_stackseg_np failed with err = %d", rslt)); |
|
939 |
|
940 *bottom = (address)((char *)ss.ss_sp - ss.ss_size); |
|
941 *size = ss.ss_size; |
|
942 #elif defined(_ALLBSD_SOURCE) |
|
943 pthread_attr_t attr; |
|
944 |
|
945 int rslt = pthread_attr_init(&attr); |
|
946 |
|
947 // JVM needs to know exact stack location, abort if it fails |
|
948 if (rslt != 0) |
|
949 fatal(err_msg("pthread_attr_init failed with err = %d", rslt)); |
|
950 |
|
951 rslt = pthread_attr_get_np(pthread_self(), &attr); |
|
952 |
|
953 if (rslt != 0) |
|
954 fatal(err_msg("pthread_attr_get_np failed with err = %d", rslt)); |
|
955 |
|
956 if (pthread_attr_getstackaddr(&attr, (void **)bottom) != 0 || |
|
957 pthread_attr_getstacksize(&attr, size) != 0) { |
|
958 fatal("Can not locate current stack attributes!"); |
|
959 } |
|
960 |
|
961 pthread_attr_destroy(&attr); |
|
962 #else |
|
963 if (os::Bsd::is_initial_thread()) { |
|
964 // initial thread needs special handling because pthread_getattr_np() |
|
965 // may return bogus value. |
|
966 *bottom = os::Bsd::initial_thread_stack_bottom(); |
|
967 *size = os::Bsd::initial_thread_stack_size(); |
|
968 } else { |
|
969 pthread_attr_t attr; |
|
970 |
|
971 int rslt = pthread_getattr_np(pthread_self(), &attr); |
|
972 |
|
973 // JVM needs to know exact stack location, abort if it fails |
|
974 if (rslt != 0) { |
|
975 if (rslt == ENOMEM) { |
|
976 vm_exit_out_of_memory(0, "pthread_getattr_np"); |
|
977 } else { |
|
978 fatal(err_msg("pthread_getattr_np failed with errno = %d", rslt)); |
|
979 } |
|
980 } |
|
981 |
|
982 if (pthread_attr_getstack(&attr, (void **)bottom, size) != 0) { |
|
983 fatal("Can not locate current stack attributes!"); |
|
984 } |
|
985 |
|
986 pthread_attr_destroy(&attr); |
|
987 |
|
988 } |
|
989 #endif |
|
990 assert(os::current_stack_pointer() >= *bottom && |
|
991 os::current_stack_pointer() < *bottom + *size, "just checking"); |
|
992 } |
|
993 |
|
994 address os::current_stack_base() { |
|
995 address bottom; |
|
996 size_t size; |
|
997 current_stack_region(&bottom, &size); |
|
998 return (bottom + size); |
|
999 } |
|
1000 |
|
1001 size_t os::current_stack_size() { |
|
1002 // stack size includes normal stack and HotSpot guard pages |
|
1003 address bottom; |
|
1004 size_t size; |
|
1005 current_stack_region(&bottom, &size); |
|
1006 return size; |
|
1007 } |
|
1008 |
|
1009 ///////////////////////////////////////////////////////////////////////////// |
|
1010 // helper functions for fatal error handler |
|
1011 |
|
1012 void os::print_context(outputStream *st, void *context) { |
|
1013 if (context == NULL) return; |
|
1014 |
|
1015 ucontext_t *uc = (ucontext_t*)context; |
|
1016 st->print_cr("Registers:"); |
|
1017 #ifdef AMD64 |
|
1018 st->print( "RAX=" INTPTR_FORMAT, uc->context_rax); |
|
1019 st->print(", RBX=" INTPTR_FORMAT, uc->context_rbx); |
|
1020 st->print(", RCX=" INTPTR_FORMAT, uc->context_rcx); |
|
1021 st->print(", RDX=" INTPTR_FORMAT, uc->context_rdx); |
|
1022 st->cr(); |
|
1023 st->print( "RSP=" INTPTR_FORMAT, uc->context_rsp); |
|
1024 st->print(", RBP=" INTPTR_FORMAT, uc->context_rbp); |
|
1025 st->print(", RSI=" INTPTR_FORMAT, uc->context_rsi); |
|
1026 st->print(", RDI=" INTPTR_FORMAT, uc->context_rdi); |
|
1027 st->cr(); |
|
1028 st->print( "R8 =" INTPTR_FORMAT, uc->context_r8); |
|
1029 st->print(", R9 =" INTPTR_FORMAT, uc->context_r9); |
|
1030 st->print(", R10=" INTPTR_FORMAT, uc->context_r10); |
|
1031 st->print(", R11=" INTPTR_FORMAT, uc->context_r11); |
|
1032 st->cr(); |
|
1033 st->print( "R12=" INTPTR_FORMAT, uc->context_r12); |
|
1034 st->print(", R13=" INTPTR_FORMAT, uc->context_r13); |
|
1035 st->print(", R14=" INTPTR_FORMAT, uc->context_r14); |
|
1036 st->print(", R15=" INTPTR_FORMAT, uc->context_r15); |
|
1037 st->cr(); |
|
1038 st->print( "RIP=" INTPTR_FORMAT, uc->context_rip); |
|
1039 st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_flags); |
|
1040 st->print(", ERR=" INTPTR_FORMAT, uc->context_err); |
|
1041 st->cr(); |
|
1042 st->print(" TRAPNO=" INTPTR_FORMAT, uc->context_trapno); |
|
1043 #else |
|
1044 st->print( "EAX=" INTPTR_FORMAT, uc->context_eax); |
|
1045 st->print(", EBX=" INTPTR_FORMAT, uc->context_ebx); |
|
1046 st->print(", ECX=" INTPTR_FORMAT, uc->context_ecx); |
|
1047 st->print(", EDX=" INTPTR_FORMAT, uc->context_edx); |
|
1048 st->cr(); |
|
1049 st->print( "ESP=" INTPTR_FORMAT, uc->context_esp); |
|
1050 st->print(", EBP=" INTPTR_FORMAT, uc->context_ebp); |
|
1051 st->print(", ESI=" INTPTR_FORMAT, uc->context_esi); |
|
1052 st->print(", EDI=" INTPTR_FORMAT, uc->context_edi); |
|
1053 st->cr(); |
|
1054 st->print( "EIP=" INTPTR_FORMAT, uc->context_eip); |
|
1055 st->print(", EFLAGS=" INTPTR_FORMAT, uc->context_eflags); |
|
1056 #endif // AMD64 |
|
1057 st->cr(); |
|
1058 st->cr(); |
|
1059 |
|
1060 intptr_t *sp = (intptr_t *)os::Bsd::ucontext_get_sp(uc); |
|
1061 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp); |
|
1062 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t)); |
|
1063 st->cr(); |
|
1064 |
|
1065 // Note: it may be unsafe to inspect memory near pc. For example, pc may |
|
1066 // point to garbage if entry point in an nmethod is corrupted. Leave |
|
1067 // this at the end, and hope for the best. |
|
1068 address pc = os::Bsd::ucontext_get_pc(uc); |
|
1069 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc); |
|
1070 print_hex_dump(st, pc - 32, pc + 32, sizeof(char)); |
|
1071 } |
|
1072 |
|
1073 void os::print_register_info(outputStream *st, void *context) { |
|
1074 if (context == NULL) return; |
|
1075 |
|
1076 ucontext_t *uc = (ucontext_t*)context; |
|
1077 |
|
1078 st->print_cr("Register to memory mapping:"); |
|
1079 st->cr(); |
|
1080 |
|
1081 // this is horrendously verbose but the layout of the registers in the |
|
1082 // context does not match how we defined our abstract Register set, so |
|
1083 // we can't just iterate through the gregs area |
|
1084 |
|
1085 // this is only for the "general purpose" registers |
|
1086 |
|
1087 #ifdef AMD64 |
|
1088 st->print("RAX="); print_location(st, uc->context_rax); |
|
1089 st->print("RBX="); print_location(st, uc->context_rbx); |
|
1090 st->print("RCX="); print_location(st, uc->context_rcx); |
|
1091 st->print("RDX="); print_location(st, uc->context_rdx); |
|
1092 st->print("RSP="); print_location(st, uc->context_rsp); |
|
1093 st->print("RBP="); print_location(st, uc->context_rbp); |
|
1094 st->print("RSI="); print_location(st, uc->context_rsi); |
|
1095 st->print("RDI="); print_location(st, uc->context_rdi); |
|
1096 st->print("R8 ="); print_location(st, uc->context_r8); |
|
1097 st->print("R9 ="); print_location(st, uc->context_r9); |
|
1098 st->print("R10="); print_location(st, uc->context_r10); |
|
1099 st->print("R11="); print_location(st, uc->context_r11); |
|
1100 st->print("R12="); print_location(st, uc->context_r12); |
|
1101 st->print("R13="); print_location(st, uc->context_r13); |
|
1102 st->print("R14="); print_location(st, uc->context_r14); |
|
1103 st->print("R15="); print_location(st, uc->context_r15); |
|
1104 #else |
|
1105 st->print("EAX="); print_location(st, uc->context_eax); |
|
1106 st->print("EBX="); print_location(st, uc->context_ebx); |
|
1107 st->print("ECX="); print_location(st, uc->context_ecx); |
|
1108 st->print("EDX="); print_location(st, uc->context_edx); |
|
1109 st->print("ESP="); print_location(st, uc->context_esp); |
|
1110 st->print("EBP="); print_location(st, uc->context_ebp); |
|
1111 st->print("ESI="); print_location(st, uc->context_esi); |
|
1112 st->print("EDI="); print_location(st, uc->context_edi); |
|
1113 #endif // AMD64 |
|
1114 |
|
1115 st->cr(); |
|
1116 } |
|
1117 |
|
1118 void os::setup_fpu() { |
|
1119 #ifndef AMD64 |
|
1120 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std(); |
|
1121 __asm__ volatile ( "fldcw (%0)" : |
|
1122 : "r" (fpu_cntrl) : "memory"); |
|
1123 #endif // !AMD64 |
|
1124 } |