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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_solaris_x86.cpp.incl"
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27
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28 // put OS-includes here
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29 # include <sys/types.h>
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30 # include <sys/mman.h>
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31 # include <pthread.h>
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32 # include <signal.h>
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33 # include <setjmp.h>
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34 # include <errno.h>
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35 # include <dlfcn.h>
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36 # include <stdio.h>
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37 # include <unistd.h>
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38 # include <sys/resource.h>
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39 # include <thread.h>
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40 # include <sys/stat.h>
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41 # include <sys/time.h>
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42 # include <sys/filio.h>
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43 # include <sys/utsname.h>
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44 # include <sys/systeminfo.h>
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45 # include <sys/socket.h>
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46 # include <sys/trap.h>
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47 # include <sys/lwp.h>
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48 # include <pwd.h>
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49 # include <poll.h>
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50 # include <sys/lwp.h>
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51 # include <procfs.h> // see comment in <sys/procfs.h>
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52
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53 #ifndef AMD64
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54 // QQQ seems useless at this point
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55 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later
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56 #endif // AMD64
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57 # include <sys/procfs.h> // see comment in <sys/procfs.h>
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58
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59
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60 #define MAX_PATH (2 * K)
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61
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62 // Minimum stack size for the VM. It's easier to document a constant value
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63 // but it's different for x86 and sparc because the page sizes are different.
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64 #ifdef AMD64
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65 size_t os::Solaris::min_stack_allowed = 224*K;
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66 #define REG_SP REG_RSP
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67 #define REG_PC REG_RIP
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68 #define REG_FP REG_RBP
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69 #else
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70 size_t os::Solaris::min_stack_allowed = 64*K;
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71 #define REG_SP UESP
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72 #define REG_PC EIP
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73 #define REG_FP EBP
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74 // 4900493 counter to prevent runaway LDTR refresh attempt
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75
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76 static volatile int ldtr_refresh = 0;
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77 // the libthread instruction that faults because of the stale LDTR
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78
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79 static const unsigned char movlfs[] = { 0x8e, 0xe0 // movl %eax,%fs
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80 };
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81 #endif // AMD64
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82
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83 char* os::non_memory_address_word() {
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84 // Must never look like an address returned by reserve_memory,
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85 // even in its subfields (as defined by the CPU immediate fields,
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86 // if the CPU splits constants across multiple instructions).
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87 return (char*) -1;
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88 }
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89
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90 //
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91 // Validate a ucontext retrieved from walking a uc_link of a ucontext.
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92 // There are issues with libthread giving out uc_links for different threads
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93 // on the same uc_link chain and bad or circular links.
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94 //
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95 bool os::Solaris::valid_ucontext(Thread* thread, ucontext_t* valid, ucontext_t* suspect) {
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96 if (valid >= suspect ||
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97 valid->uc_stack.ss_flags != suspect->uc_stack.ss_flags ||
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98 valid->uc_stack.ss_sp != suspect->uc_stack.ss_sp ||
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99 valid->uc_stack.ss_size != suspect->uc_stack.ss_size) {
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100 DEBUG_ONLY(tty->print_cr("valid_ucontext: failed test 1");)
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101 return false;
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102 }
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103
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104 if (thread->is_Java_thread()) {
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105 if (!valid_stack_address(thread, (address)suspect)) {
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106 DEBUG_ONLY(tty->print_cr("valid_ucontext: uc_link not in thread stack");)
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107 return false;
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108 }
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109 if (!valid_stack_address(thread, (address) suspect->uc_mcontext.gregs[REG_SP])) {
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110 DEBUG_ONLY(tty->print_cr("valid_ucontext: stackpointer not in thread stack");)
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111 return false;
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112 }
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113 }
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114 return true;
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115 }
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116
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117 // We will only follow one level of uc_link since there are libthread
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118 // issues with ucontext linking and it is better to be safe and just
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119 // let caller retry later.
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120 ucontext_t* os::Solaris::get_valid_uc_in_signal_handler(Thread *thread,
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121 ucontext_t *uc) {
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122
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123 ucontext_t *retuc = NULL;
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124
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125 if (uc != NULL) {
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126 if (uc->uc_link == NULL) {
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127 // cannot validate without uc_link so accept current ucontext
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128 retuc = uc;
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129 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
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130 // first ucontext is valid so try the next one
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131 uc = uc->uc_link;
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132 if (uc->uc_link == NULL) {
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133 // cannot validate without uc_link so accept current ucontext
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134 retuc = uc;
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135 } else if (os::Solaris::valid_ucontext(thread, uc, uc->uc_link)) {
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136 // the ucontext one level down is also valid so return it
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137 retuc = uc;
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138 }
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139 }
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140 }
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141 return retuc;
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142 }
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143
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144 // Assumes ucontext is valid
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145 ExtendedPC os::Solaris::ucontext_get_ExtendedPC(ucontext_t *uc) {
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146 return ExtendedPC((address)uc->uc_mcontext.gregs[REG_PC]);
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147 }
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148
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149 // Assumes ucontext is valid
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150 intptr_t* os::Solaris::ucontext_get_sp(ucontext_t *uc) {
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151 return (intptr_t*)uc->uc_mcontext.gregs[REG_SP];
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152 }
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153
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154 // Assumes ucontext is valid
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155 intptr_t* os::Solaris::ucontext_get_fp(ucontext_t *uc) {
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156 return (intptr_t*)uc->uc_mcontext.gregs[REG_FP];
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157 }
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158
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159 // For Forte Analyzer AsyncGetCallTrace profiling support - thread
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160 // is currently interrupted by SIGPROF.
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161 //
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162 // The difference between this and os::fetch_frame_from_context() is that
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163 // here we try to skip nested signal frames.
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164 ExtendedPC os::Solaris::fetch_frame_from_ucontext(Thread* thread,
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165 ucontext_t* uc, intptr_t** ret_sp, intptr_t** ret_fp) {
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166
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167 assert(thread != NULL, "just checking");
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168 assert(ret_sp != NULL, "just checking");
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169 assert(ret_fp != NULL, "just checking");
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170
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171 ucontext_t *luc = os::Solaris::get_valid_uc_in_signal_handler(thread, uc);
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172 return os::fetch_frame_from_context(luc, ret_sp, ret_fp);
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173 }
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174
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175 ExtendedPC os::fetch_frame_from_context(void* ucVoid,
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176 intptr_t** ret_sp, intptr_t** ret_fp) {
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177
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178 ExtendedPC epc;
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179 ucontext_t *uc = (ucontext_t*)ucVoid;
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180
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181 if (uc != NULL) {
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182 epc = os::Solaris::ucontext_get_ExtendedPC(uc);
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183 if (ret_sp) *ret_sp = os::Solaris::ucontext_get_sp(uc);
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184 if (ret_fp) *ret_fp = os::Solaris::ucontext_get_fp(uc);
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185 } else {
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186 // construct empty ExtendedPC for return value checking
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187 epc = ExtendedPC(NULL);
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188 if (ret_sp) *ret_sp = (intptr_t *)NULL;
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189 if (ret_fp) *ret_fp = (intptr_t *)NULL;
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190 }
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191
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192 return epc;
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193 }
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194
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195 frame os::fetch_frame_from_context(void* ucVoid) {
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196 intptr_t* sp;
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197 intptr_t* fp;
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198 ExtendedPC epc = fetch_frame_from_context(ucVoid, &sp, &fp);
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199 return frame(sp, fp, epc.pc());
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200 }
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201
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202 frame os::get_sender_for_C_frame(frame* fr) {
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203 return frame(fr->sender_sp(), fr->link(), fr->sender_pc());
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204 }
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205
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206 extern "C" intptr_t *_get_previous_fp(); // in .il file.
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207
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208 frame os::current_frame() {
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209 intptr_t* fp = _get_previous_fp();
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210 frame myframe((intptr_t*)os::current_stack_pointer(),
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211 (intptr_t*)fp,
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212 CAST_FROM_FN_PTR(address, os::current_frame));
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213 if (os::is_first_C_frame(&myframe)) {
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214 // stack is not walkable
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215 return frame(NULL, NULL, NULL);
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216 } else {
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217 return os::get_sender_for_C_frame(&myframe);
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218 }
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219 }
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220
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221 // This is a simple callback that just fetches a PC for an interrupted thread.
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222 // The thread need not be suspended and the fetched PC is just a hint.
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223 // This one is currently used for profiling the VMThread ONLY!
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224
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225 // Must be synchronous
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226 void GetThreadPC_Callback::execute(OSThread::InterruptArguments *args) {
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227 Thread* thread = args->thread();
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228 ucontext_t* uc = args->ucontext();
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229 intptr_t* sp;
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230
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231 assert(ProfileVM && thread->is_VM_thread(), "just checking");
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232
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233 ExtendedPC new_addr((address)uc->uc_mcontext.gregs[REG_PC]);
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234 _addr = new_addr;
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235 }
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236
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237 static int threadgetstate(thread_t tid, int *flags, lwpid_t *lwp, stack_t *ss, gregset_t rs, lwpstatus_t *lwpstatus) {
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238 char lwpstatusfile[PROCFILE_LENGTH];
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239 int lwpfd, err;
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240
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241 if (err = os::Solaris::thr_getstate(tid, flags, lwp, ss, rs))
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242 return (err);
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243 if (*flags == TRS_LWPID) {
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244 sprintf(lwpstatusfile, "/proc/%d/lwp/%d/lwpstatus", getpid(),
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245 *lwp);
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246 if ((lwpfd = open(lwpstatusfile, O_RDONLY)) < 0) {
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247 perror("thr_mutator_status: open lwpstatus");
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248 return (EINVAL);
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249 }
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250 if (pread(lwpfd, lwpstatus, sizeof (lwpstatus_t), (off_t)0) !=
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251 sizeof (lwpstatus_t)) {
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252 perror("thr_mutator_status: read lwpstatus");
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253 (void) close(lwpfd);
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254 return (EINVAL);
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255 }
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256 (void) close(lwpfd);
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257 }
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258 return (0);
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259 }
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260
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261 #ifndef AMD64
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262
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263 // Detecting SSE support by OS
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264 // From solaris_i486.s
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265 extern "C" bool sse_check();
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266 extern "C" bool sse_unavailable();
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267
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268 enum { SSE_UNKNOWN, SSE_NOT_SUPPORTED, SSE_SUPPORTED};
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269 static int sse_status = SSE_UNKNOWN;
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270
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271
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272 static void check_for_sse_support() {
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273 if (!VM_Version::supports_sse()) {
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274 sse_status = SSE_NOT_SUPPORTED;
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275 return;
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276 }
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277 // looking for _sse_hw in libc.so, if it does not exist or
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278 // the value (int) is 0, OS has no support for SSE
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279 int *sse_hwp;
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280 void *h;
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281
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282 if ((h=dlopen("/usr/lib/libc.so", RTLD_LAZY)) == NULL) {
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283 //open failed, presume no support for SSE
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284 sse_status = SSE_NOT_SUPPORTED;
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285 return;
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286 }
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287 if ((sse_hwp = (int *)dlsym(h, "_sse_hw")) == NULL) {
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288 sse_status = SSE_NOT_SUPPORTED;
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289 } else if (*sse_hwp == 0) {
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290 sse_status = SSE_NOT_SUPPORTED;
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291 }
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292 dlclose(h);
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293
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294 if (sse_status == SSE_UNKNOWN) {
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295 bool (*try_sse)() = (bool (*)())sse_check;
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296 sse_status = (*try_sse)() ? SSE_SUPPORTED : SSE_NOT_SUPPORTED;
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297 }
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298
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299 }
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300
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301 bool os::supports_sse() {
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302 if (sse_status == SSE_UNKNOWN)
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303 check_for_sse_support();
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304 return sse_status == SSE_SUPPORTED;
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305 }
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306
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307 #endif // AMD64
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308
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309 bool os::is_allocatable(size_t bytes) {
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310 #ifdef AMD64
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311 return true;
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312 #else
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313
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314 if (bytes < 2 * G) {
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315 return true;
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316 }
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317
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318 char* addr = reserve_memory(bytes, NULL);
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319
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320 if (addr != NULL) {
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321 release_memory(addr, bytes);
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322 }
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323
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324 return addr != NULL;
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325 #endif // AMD64
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326
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327 }
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328
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329 extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
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330
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331 extern "C" void Fetch32PFI () ;
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332 extern "C" void Fetch32Resume () ;
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333 #ifdef AMD64
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334 extern "C" void FetchNPFI () ;
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335 extern "C" void FetchNResume () ;
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336 #endif // AMD64
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337
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338 int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
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339 ucontext_t* uc = (ucontext_t*) ucVoid;
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340
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341 #ifndef AMD64
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342 if (sig == SIGILL && info->si_addr == (caddr_t)sse_check) {
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343 // the SSE instruction faulted. supports_sse() need return false.
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344 uc->uc_mcontext.gregs[EIP] = (greg_t)sse_unavailable;
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345 return true;
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346 }
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347 #endif // !AMD64
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348
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349 Thread* t = ThreadLocalStorage::get_thread_slow(); // slow & steady
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350
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351 SignalHandlerMark shm(t);
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352
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353 if(sig == SIGPIPE || sig == SIGXFSZ) {
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354 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
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355 return true;
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356 } else {
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357 if (PrintMiscellaneous && (WizardMode || Verbose)) {
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358 char buf[64];
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359 warning("Ignoring %s - see 4229104 or 6499219",
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360 os::exception_name(sig, buf, sizeof(buf)));
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361
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362 }
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363 return true;
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364 }
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365 }
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366
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367 JavaThread* thread = NULL;
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368 VMThread* vmthread = NULL;
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369
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370 if (os::Solaris::signal_handlers_are_installed) {
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371 if (t != NULL ){
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372 if(t->is_Java_thread()) {
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373 thread = (JavaThread*)t;
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374 }
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375 else if(t->is_VM_thread()){
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376 vmthread = (VMThread *)t;
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377 }
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378 }
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379 }
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380
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381 guarantee(sig != os::Solaris::SIGinterrupt(), "Can not chain VM interrupt signal, try -XX:+UseAltSigs");
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382
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383 if (sig == os::Solaris::SIGasync()) {
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384 if(thread){
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385 OSThread::InterruptArguments args(thread, uc);
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386 thread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
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387 return true;
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388 }
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|
|
389 else if(vmthread){
|
|
|
390 OSThread::InterruptArguments args(vmthread, uc);
|
|
|
391 vmthread->osthread()->do_interrupt_callbacks_at_interrupt(&args);
|
|
|
392 return true;
|
|
|
393 } else if (os::Solaris::chained_handler(sig, info, ucVoid)) {
|
|
|
394 return true;
|
|
|
395 } else {
|
|
|
396 // If os::Solaris::SIGasync not chained, and this is a non-vm and
|
|
|
397 // non-java thread
|
|
|
398 return true;
|
|
|
399 }
|
|
|
400 }
|
|
|
401
|
|
|
402 if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
|
|
|
403 // can't decode this kind of signal
|
|
|
404 info = NULL;
|
|
|
405 } else {
|
|
|
406 assert(sig == info->si_signo, "bad siginfo");
|
|
|
407 }
|
|
|
408
|
|
|
409 // decide if this trap can be handled by a stub
|
|
|
410 address stub = NULL;
|
|
|
411
|
|
|
412 address pc = NULL;
|
|
|
413
|
|
|
414 //%note os_trap_1
|
|
|
415 if (info != NULL && uc != NULL && thread != NULL) {
|
|
|
416 // factor me: getPCfromContext
|
|
|
417 pc = (address) uc->uc_mcontext.gregs[REG_PC];
|
|
|
418
|
|
|
419 // SafeFetch32() support
|
|
|
420 if (pc == (address) Fetch32PFI) {
|
|
|
421 uc->uc_mcontext.gregs[REG_PC] = intptr_t(Fetch32Resume) ;
|
|
|
422 return true ;
|
|
|
423 }
|
|
|
424 #ifdef AMD64
|
|
|
425 if (pc == (address) FetchNPFI) {
|
|
|
426 uc->uc_mcontext.gregs [REG_PC] = intptr_t(FetchNResume) ;
|
|
|
427 return true ;
|
|
|
428 }
|
|
|
429 #endif // AMD64
|
|
|
430
|
|
|
431 // Handle ALL stack overflow variations here
|
|
|
432 if (sig == SIGSEGV && info->si_code == SEGV_ACCERR) {
|
|
|
433 address addr = (address) info->si_addr;
|
|
|
434 if (thread->in_stack_yellow_zone(addr)) {
|
|
|
435 thread->disable_stack_yellow_zone();
|
|
|
436 if (thread->thread_state() == _thread_in_Java) {
|
|
|
437 // Throw a stack overflow exception. Guard pages will be reenabled
|
|
|
438 // while unwinding the stack.
|
|
|
439 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::STACK_OVERFLOW);
|
|
|
440 } else {
|
|
|
441 // Thread was in the vm or native code. Return and try to finish.
|
|
|
442 return true;
|
|
|
443 }
|
|
|
444 } else if (thread->in_stack_red_zone(addr)) {
|
|
|
445 // Fatal red zone violation. Disable the guard pages and fall through
|
|
|
446 // to handle_unexpected_exception way down below.
|
|
|
447 thread->disable_stack_red_zone();
|
|
|
448 tty->print_raw_cr("An irrecoverable stack overflow has occurred.");
|
|
|
449 }
|
|
|
450 }
|
|
|
451
|
|
|
452 if (thread->thread_state() == _thread_in_vm) {
|
|
|
453 if (sig == SIGBUS && info->si_code == BUS_OBJERR && thread->doing_unsafe_access()) {
|
|
|
454 stub = StubRoutines::handler_for_unsafe_access();
|
|
|
455 }
|
|
|
456 }
|
|
|
457
|
|
|
458 if (thread->thread_state() == _thread_in_Java) {
|
|
|
459 // Support Safepoint Polling
|
|
|
460 if ( sig == SIGSEGV && os::is_poll_address((address)info->si_addr)) {
|
|
|
461 stub = SharedRuntime::get_poll_stub(pc);
|
|
|
462 }
|
|
|
463 else if (sig == SIGBUS && info->si_code == BUS_OBJERR) {
|
|
|
464 // BugId 4454115: A read from a MappedByteBuffer can fault
|
|
|
465 // here if the underlying file has been truncated.
|
|
|
466 // Do not crash the VM in such a case.
|
|
|
467 CodeBlob* cb = CodeCache::find_blob_unsafe(pc);
|
|
|
468 nmethod* nm = cb->is_nmethod() ? (nmethod*)cb : NULL;
|
|
|
469 if (nm != NULL && nm->has_unsafe_access()) {
|
|
|
470 stub = StubRoutines::handler_for_unsafe_access();
|
|
|
471 }
|
|
|
472 }
|
|
|
473 else
|
|
|
474 if (sig == SIGFPE && info->si_code == FPE_INTDIV) {
|
|
|
475 // integer divide by zero
|
|
|
476 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
|
|
|
477 }
|
|
|
478 #ifndef AMD64
|
|
|
479 else if (sig == SIGFPE && info->si_code == FPE_FLTDIV) {
|
|
|
480 // floating-point divide by zero
|
|
|
481 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_DIVIDE_BY_ZERO);
|
|
|
482 }
|
|
|
483 else if (sig == SIGFPE && info->si_code == FPE_FLTINV) {
|
|
|
484 // The encoding of D2I in i486.ad can cause an exception prior
|
|
|
485 // to the fist instruction if there was an invalid operation
|
|
|
486 // pending. We want to dismiss that exception. From the win_32
|
|
|
487 // side it also seems that if it really was the fist causing
|
|
|
488 // the exception that we do the d2i by hand with different
|
|
|
489 // rounding. Seems kind of weird. QQQ TODO
|
|
|
490 // Note that we take the exception at the NEXT floating point instruction.
|
|
|
491 if (pc[0] == 0xDB) {
|
|
|
492 assert(pc[0] == 0xDB, "not a FIST opcode");
|
|
|
493 assert(pc[1] == 0x14, "not a FIST opcode");
|
|
|
494 assert(pc[2] == 0x24, "not a FIST opcode");
|
|
|
495 return true;
|
|
|
496 } else {
|
|
|
497 assert(pc[-3] == 0xDB, "not an flt invalid opcode");
|
|
|
498 assert(pc[-2] == 0x14, "not an flt invalid opcode");
|
|
|
499 assert(pc[-1] == 0x24, "not an flt invalid opcode");
|
|
|
500 }
|
|
|
501 }
|
|
|
502 else if (sig == SIGFPE ) {
|
|
|
503 tty->print_cr("caught SIGFPE, info 0x%x.", info->si_code);
|
|
|
504 }
|
|
|
505 #endif // !AMD64
|
|
|
506
|
|
|
507 // QQQ It doesn't seem that we need to do this on x86 because we should be able
|
|
|
508 // to return properly from the handler without this extra stuff on the back side.
|
|
|
509
|
|
|
510 else if (sig == SIGSEGV && info->si_code > 0 && !MacroAssembler::needs_explicit_null_check((intptr_t)info->si_addr)) {
|
|
|
511 // Determination of interpreter/vtable stub/compiled code null exception
|
|
|
512 stub = SharedRuntime::continuation_for_implicit_exception(thread, pc, SharedRuntime::IMPLICIT_NULL);
|
|
|
513 }
|
|
|
514 }
|
|
|
515
|
|
|
516 // jni_fast_Get<Primitive>Field can trap at certain pc's if a GC kicks in
|
|
|
517 // and the heap gets shrunk before the field access.
|
|
|
518 if ((sig == SIGSEGV) || (sig == SIGBUS)) {
|
|
|
519 address addr = JNI_FastGetField::find_slowcase_pc(pc);
|
|
|
520 if (addr != (address)-1) {
|
|
|
521 stub = addr;
|
|
|
522 }
|
|
|
523 }
|
|
|
524
|
|
|
525 // Check to see if we caught the safepoint code in the
|
|
|
526 // process of write protecting the memory serialization page.
|
|
|
527 // It write enables the page immediately after protecting it
|
|
|
528 // so we can just return to retry the write.
|
|
|
529 if ((sig == SIGSEGV) &&
|
|
|
530 os::is_memory_serialize_page(thread, (address)info->si_addr)) {
|
|
|
531 // Block current thread until the memory serialize page permission restored.
|
|
|
532 os::block_on_serialize_page_trap();
|
|
|
533 return true;
|
|
|
534 }
|
|
|
535 }
|
|
|
536
|
|
|
537 // Execution protection violation
|
|
|
538 //
|
|
|
539 // Preventative code for future versions of Solaris which may
|
|
|
540 // enable execution protection when running the 32-bit VM on AMD64.
|
|
|
541 //
|
|
|
542 // This should be kept as the last step in the triage. We don't
|
|
|
543 // have a dedicated trap number for a no-execute fault, so be
|
|
|
544 // conservative and allow other handlers the first shot.
|
|
|
545 //
|
|
|
546 // Note: We don't test that info->si_code == SEGV_ACCERR here.
|
|
|
547 // this si_code is so generic that it is almost meaningless; and
|
|
|
548 // the si_code for this condition may change in the future.
|
|
|
549 // Furthermore, a false-positive should be harmless.
|
|
|
550 if (UnguardOnExecutionViolation > 0 &&
|
|
|
551 (sig == SIGSEGV || sig == SIGBUS) &&
|
|
|
552 uc->uc_mcontext.gregs[TRAPNO] == T_PGFLT) { // page fault
|
|
|
553 int page_size = os::vm_page_size();
|
|
|
554 address addr = (address) info->si_addr;
|
|
|
555 address pc = (address) uc->uc_mcontext.gregs[REG_PC];
|
|
|
556 // Make sure the pc and the faulting address are sane.
|
|
|
557 //
|
|
|
558 // If an instruction spans a page boundary, and the page containing
|
|
|
559 // the beginning of the instruction is executable but the following
|
|
|
560 // page is not, the pc and the faulting address might be slightly
|
|
|
561 // different - we still want to unguard the 2nd page in this case.
|
|
|
562 //
|
|
|
563 // 15 bytes seems to be a (very) safe value for max instruction size.
|
|
|
564 bool pc_is_near_addr =
|
|
|
565 (pointer_delta((void*) addr, (void*) pc, sizeof(char)) < 15);
|
|
|
566 bool instr_spans_page_boundary =
|
|
|
567 (align_size_down((intptr_t) pc ^ (intptr_t) addr,
|
|
|
568 (intptr_t) page_size) > 0);
|
|
|
569
|
|
|
570 if (pc == addr || (pc_is_near_addr && instr_spans_page_boundary)) {
|
|
|
571 static volatile address last_addr =
|
|
|
572 (address) os::non_memory_address_word();
|
|
|
573
|
|
|
574 // In conservative mode, don't unguard unless the address is in the VM
|
|
|
575 if (addr != last_addr &&
|
|
|
576 (UnguardOnExecutionViolation > 1 || os::address_is_in_vm(addr))) {
|
|
|
577
|
|
|
578 // Unguard and retry
|
|
|
579 address page_start =
|
|
|
580 (address) align_size_down((intptr_t) addr, (intptr_t) page_size);
|
|
|
581 bool res = os::unguard_memory((char*) page_start, page_size);
|
|
|
582
|
|
|
583 if (PrintMiscellaneous && Verbose) {
|
|
|
584 char buf[256];
|
|
|
585 jio_snprintf(buf, sizeof(buf), "Execution protection violation "
|
|
|
586 "at " INTPTR_FORMAT
|
|
|
587 ", unguarding " INTPTR_FORMAT ": %s, errno=%d", addr,
|
|
|
588 page_start, (res ? "success" : "failed"), errno);
|
|
|
589 tty->print_raw_cr(buf);
|
|
|
590 }
|
|
|
591 stub = pc;
|
|
|
592
|
|
|
593 // Set last_addr so if we fault again at the same address, we don't end
|
|
|
594 // up in an endless loop.
|
|
|
595 //
|
|
|
596 // There are two potential complications here. Two threads trapping at
|
|
|
597 // the same address at the same time could cause one of the threads to
|
|
|
598 // think it already unguarded, and abort the VM. Likely very rare.
|
|
|
599 //
|
|
|
600 // The other race involves two threads alternately trapping at
|
|
|
601 // different addresses and failing to unguard the page, resulting in
|
|
|
602 // an endless loop. This condition is probably even more unlikely than
|
|
|
603 // the first.
|
|
|
604 //
|
|
|
605 // Although both cases could be avoided by using locks or thread local
|
|
|
606 // last_addr, these solutions are unnecessary complication: this
|
|
|
607 // handler is a best-effort safety net, not a complete solution. It is
|
|
|
608 // disabled by default and should only be used as a workaround in case
|
|
|
609 // we missed any no-execute-unsafe VM code.
|
|
|
610
|
|
|
611 last_addr = addr;
|
|
|
612 }
|
|
|
613 }
|
|
|
614 }
|
|
|
615
|
|
|
616 if (stub != NULL) {
|
|
|
617 // save all thread context in case we need to restore it
|
|
|
618
|
|
|
619 if (thread != NULL) thread->set_saved_exception_pc(pc);
|
|
|
620 // 12/02/99: On Sparc it appears that the full context is also saved
|
|
|
621 // but as yet, no one looks at or restores that saved context
|
|
|
622 // factor me: setPC
|
|
|
623 uc->uc_mcontext.gregs[REG_PC] = (greg_t)stub;
|
|
|
624 return true;
|
|
|
625 }
|
|
|
626
|
|
|
627 // signal-chaining
|
|
|
628 if (os::Solaris::chained_handler(sig, info, ucVoid)) {
|
|
|
629 return true;
|
|
|
630 }
|
|
|
631
|
|
|
632 #ifndef AMD64
|
|
|
633 // Workaround (bug 4900493) for Solaris kernel bug 4966651.
|
|
|
634 // Handle an undefined selector caused by an attempt to assign
|
|
|
635 // fs in libthread getipriptr(). With the current libthread design every 512
|
|
|
636 // thread creations the LDT for a private thread data structure is extended
|
|
|
637 // and thre is a hazard that and another thread attempting a thread creation
|
|
|
638 // will use a stale LDTR that doesn't reflect the structure's growth,
|
|
|
639 // causing a GP fault.
|
|
|
640 // Enforce the probable limit of passes through here to guard against an
|
|
|
641 // infinite loop if some other move to fs caused the GP fault. Note that
|
|
|
642 // this loop counter is ultimately a heuristic as it is possible for
|
|
|
643 // more than one thread to generate this fault at a time in an MP system.
|
|
|
644 // In the case of the loop count being exceeded or if the poll fails
|
|
|
645 // just fall through to a fatal error.
|
|
|
646 // If there is some other source of T_GPFLT traps and the text at EIP is
|
|
|
647 // unreadable this code will loop infinitely until the stack is exausted.
|
|
|
648 // The key to diagnosis in this case is to look for the bottom signal handler
|
|
|
649 // frame.
|
|
|
650
|
|
|
651 if(! IgnoreLibthreadGPFault) {
|
|
|
652 if (sig == SIGSEGV && uc->uc_mcontext.gregs[TRAPNO] == T_GPFLT) {
|
|
|
653 const unsigned char *p =
|
|
|
654 (unsigned const char *) uc->uc_mcontext.gregs[EIP];
|
|
|
655
|
|
|
656 // Expected instruction?
|
|
|
657
|
|
|
658 if(p[0] == movlfs[0] && p[1] == movlfs[1]) {
|
|
|
659
|
|
|
660 Atomic::inc(&ldtr_refresh);
|
|
|
661
|
|
|
662 // Infinite loop?
|
|
|
663
|
|
|
664 if(ldtr_refresh < ((2 << 16) / PAGESIZE)) {
|
|
|
665
|
|
|
666 // No, force scheduling to get a fresh view of the LDTR
|
|
|
667
|
|
|
668 if(poll(NULL, 0, 10) == 0) {
|
|
|
669
|
|
|
670 // Retry the move
|
|
|
671
|
|
|
672 return false;
|
|
|
673 }
|
|
|
674 }
|
|
|
675 }
|
|
|
676 }
|
|
|
677 }
|
|
|
678 #endif // !AMD64
|
|
|
679
|
|
|
680 if (!abort_if_unrecognized) {
|
|
|
681 // caller wants another chance, so give it to him
|
|
|
682 return false;
|
|
|
683 }
|
|
|
684
|
|
|
685 if (!os::Solaris::libjsig_is_loaded) {
|
|
|
686 struct sigaction oldAct;
|
|
|
687 sigaction(sig, (struct sigaction *)0, &oldAct);
|
|
|
688 if (oldAct.sa_sigaction != signalHandler) {
|
|
|
689 void* sighand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction)
|
|
|
690 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler);
|
|
|
691 warning("Unexpected Signal %d occured under user-defined signal handler %#lx", sig, (long)sighand);
|
|
|
692 }
|
|
|
693 }
|
|
|
694
|
|
|
695 if (pc == NULL && uc != NULL) {
|
|
|
696 pc = (address) uc->uc_mcontext.gregs[REG_PC];
|
|
|
697 }
|
|
|
698
|
|
|
699 // unmask current signal
|
|
|
700 sigset_t newset;
|
|
|
701 sigemptyset(&newset);
|
|
|
702 sigaddset(&newset, sig);
|
|
|
703 sigprocmask(SIG_UNBLOCK, &newset, NULL);
|
|
|
704
|
|
|
705 VMError err(t, sig, pc, info, ucVoid);
|
|
|
706 err.report_and_die();
|
|
|
707
|
|
|
708 ShouldNotReachHere();
|
|
|
709 }
|
|
|
710
|
|
|
711 void os::print_context(outputStream *st, void *context) {
|
|
|
712 if (context == NULL) return;
|
|
|
713
|
|
|
714 ucontext_t *uc = (ucontext_t*)context;
|
|
|
715 st->print_cr("Registers:");
|
|
|
716 #ifdef AMD64
|
|
|
717 st->print( "RAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RAX]);
|
|
|
718 st->print(", RBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBX]);
|
|
|
719 st->print(", RCX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RCX]);
|
|
|
720 st->print(", RDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDX]);
|
|
|
721 st->cr();
|
|
|
722 st->print( "RSP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSP]);
|
|
|
723 st->print(", RBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RBP]);
|
|
|
724 st->print(", RSI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RSI]);
|
|
|
725 st->print(", RDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RDI]);
|
|
|
726 st->cr();
|
|
|
727 st->print(", R8=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R8]);
|
|
|
728 st->print(", R9=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R9]);
|
|
|
729 st->print(", R10=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R10]);
|
|
|
730 st->print(", R11=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R11]);
|
|
|
731 st->print(", R12=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R12]);
|
|
|
732 st->print(", R13=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R13]);
|
|
|
733 st->print(", R14=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R14]);
|
|
|
734 st->print(", R15=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_R15]);
|
|
|
735 st->cr();
|
|
|
736 st->print( "RIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RIP]);
|
|
|
737 st->print(", RFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[REG_RFL]);
|
|
|
738 #else
|
|
|
739 st->print( "EAX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EAX]);
|
|
|
740 st->print(", EBX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBX]);
|
|
|
741 st->print(", ECX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ECX]);
|
|
|
742 st->print(", EDX=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDX]);
|
|
|
743 st->cr();
|
|
|
744 st->print( "ESP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[UESP]);
|
|
|
745 st->print(", EBP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EBP]);
|
|
|
746 st->print(", ESI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[ESI]);
|
|
|
747 st->print(", EDI=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EDI]);
|
|
|
748 st->cr();
|
|
|
749 st->print( "EIP=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EIP]);
|
|
|
750 st->print(", EFLAGS=" INTPTR_FORMAT, uc->uc_mcontext.gregs[EFL]);
|
|
|
751 #endif // AMD64
|
|
|
752 st->cr();
|
|
|
753 st->cr();
|
|
|
754
|
|
|
755 intptr_t *sp = (intptr_t *)os::Solaris::ucontext_get_sp(uc);
|
|
|
756 st->print_cr("Top of Stack: (sp=" PTR_FORMAT ")", sp);
|
|
|
757 print_hex_dump(st, (address)sp, (address)(sp + 8*sizeof(intptr_t)), sizeof(intptr_t));
|
|
|
758 st->cr();
|
|
|
759
|
|
|
760 // Note: it may be unsafe to inspect memory near pc. For example, pc may
|
|
|
761 // point to garbage if entry point in an nmethod is corrupted. Leave
|
|
|
762 // this at the end, and hope for the best.
|
|
|
763 ExtendedPC epc = os::Solaris::ucontext_get_ExtendedPC(uc);
|
|
|
764 address pc = epc.pc();
|
|
|
765 st->print_cr("Instructions: (pc=" PTR_FORMAT ")", pc);
|
|
|
766 print_hex_dump(st, pc - 16, pc + 16, sizeof(char));
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|
|
767 }
|
|
|
768
|
|
|
769 #ifdef AMD64
|
|
|
770 void os::Solaris::init_thread_fpu_state(void) {
|
|
|
771 // Nothing to do
|
|
|
772 }
|
|
|
773 #else
|
|
|
774 // From solaris_i486.s
|
|
|
775 extern "C" void fixcw();
|
|
|
776
|
|
|
777 void os::Solaris::init_thread_fpu_state(void) {
|
|
|
778 // Set fpu to 53 bit precision. This happens too early to use a stub.
|
|
|
779 fixcw();
|
|
|
780 }
|
|
|
781
|
|
|
782 // These routines are the initial value of atomic_xchg_entry(),
|
|
|
783 // atomic_cmpxchg_entry(), atomic_inc_entry() and fence_entry()
|
|
|
784 // until initialization is complete.
|
|
|
785 // TODO - replace with .il implementation when compiler supports it.
|
|
|
786
|
|
|
787 typedef jint xchg_func_t (jint, volatile jint*);
|
|
|
788 typedef jint cmpxchg_func_t (jint, volatile jint*, jint);
|
|
|
789 typedef jlong cmpxchg_long_func_t(jlong, volatile jlong*, jlong);
|
|
|
790 typedef jint add_func_t (jint, volatile jint*);
|
|
|
791 typedef void fence_func_t ();
|
|
|
792
|
|
|
793 jint os::atomic_xchg_bootstrap(jint exchange_value, volatile jint* dest) {
|
|
|
794 // try to use the stub:
|
|
|
795 xchg_func_t* func = CAST_TO_FN_PTR(xchg_func_t*, StubRoutines::atomic_xchg_entry());
|
|
|
796
|
|
|
797 if (func != NULL) {
|
|
|
798 os::atomic_xchg_func = func;
|
|
|
799 return (*func)(exchange_value, dest);
|
|
|
800 }
|
|
|
801 assert(Threads::number_of_threads() == 0, "for bootstrap only");
|
|
|
802
|
|
|
803 jint old_value = *dest;
|
|
|
804 *dest = exchange_value;
|
|
|
805 return old_value;
|
|
|
806 }
|
|
|
807
|
|
|
808 jint os::atomic_cmpxchg_bootstrap(jint exchange_value, volatile jint* dest, jint compare_value) {
|
|
|
809 // try to use the stub:
|
|
|
810 cmpxchg_func_t* func = CAST_TO_FN_PTR(cmpxchg_func_t*, StubRoutines::atomic_cmpxchg_entry());
|
|
|
811
|
|
|
812 if (func != NULL) {
|
|
|
813 os::atomic_cmpxchg_func = func;
|
|
|
814 return (*func)(exchange_value, dest, compare_value);
|
|
|
815 }
|
|
|
816 assert(Threads::number_of_threads() == 0, "for bootstrap only");
|
|
|
817
|
|
|
818 jint old_value = *dest;
|
|
|
819 if (old_value == compare_value)
|
|
|
820 *dest = exchange_value;
|
|
|
821 return old_value;
|
|
|
822 }
|
|
|
823
|
|
|
824 jlong os::atomic_cmpxchg_long_bootstrap(jlong exchange_value, volatile jlong* dest, jlong compare_value) {
|
|
|
825 // try to use the stub:
|
|
|
826 cmpxchg_long_func_t* func = CAST_TO_FN_PTR(cmpxchg_long_func_t*, StubRoutines::atomic_cmpxchg_long_entry());
|
|
|
827
|
|
|
828 if (func != NULL) {
|
|
|
829 os::atomic_cmpxchg_long_func = func;
|
|
|
830 return (*func)(exchange_value, dest, compare_value);
|
|
|
831 }
|
|
|
832 assert(Threads::number_of_threads() == 0, "for bootstrap only");
|
|
|
833
|
|
|
834 jlong old_value = *dest;
|
|
|
835 if (old_value == compare_value)
|
|
|
836 *dest = exchange_value;
|
|
|
837 return old_value;
|
|
|
838 }
|
|
|
839
|
|
|
840 jint os::atomic_add_bootstrap(jint add_value, volatile jint* dest) {
|
|
|
841 // try to use the stub:
|
|
|
842 add_func_t* func = CAST_TO_FN_PTR(add_func_t*, StubRoutines::atomic_add_entry());
|
|
|
843
|
|
|
844 if (func != NULL) {
|
|
|
845 os::atomic_add_func = func;
|
|
|
846 return (*func)(add_value, dest);
|
|
|
847 }
|
|
|
848 assert(Threads::number_of_threads() == 0, "for bootstrap only");
|
|
|
849
|
|
|
850 return (*dest) += add_value;
|
|
|
851 }
|
|
|
852
|
|
|
853 void os::fence_bootstrap() {
|
|
|
854 // try to use the stub:
|
|
|
855 fence_func_t* func = CAST_TO_FN_PTR(fence_func_t*, StubRoutines::fence_entry());
|
|
|
856
|
|
|
857 if (func != NULL) {
|
|
|
858 os::fence_func = func;
|
|
|
859 (*func)();
|
|
|
860 return;
|
|
|
861 }
|
|
|
862 assert(Threads::number_of_threads() == 0, "for bootstrap only");
|
|
|
863
|
|
|
864 // don't have to do anything for a single thread
|
|
|
865 }
|
|
|
866
|
|
|
867 xchg_func_t* os::atomic_xchg_func = os::atomic_xchg_bootstrap;
|
|
|
868 cmpxchg_func_t* os::atomic_cmpxchg_func = os::atomic_cmpxchg_bootstrap;
|
|
|
869 cmpxchg_long_func_t* os::atomic_cmpxchg_long_func = os::atomic_cmpxchg_long_bootstrap;
|
|
|
870 add_func_t* os::atomic_add_func = os::atomic_add_bootstrap;
|
|
|
871 fence_func_t* os::fence_func = os::fence_bootstrap;
|
|
|
872
|
|
|
873 extern "C" _solaris_raw_setup_fpu(address ptr);
|
|
|
874 void os::setup_fpu() {
|
|
|
875 address fpu_cntrl = StubRoutines::addr_fpu_cntrl_wrd_std();
|
|
|
876 _solaris_raw_setup_fpu(fpu_cntrl);
|
|
|
877 }
|
|
|
878 #endif // AMD64
|
