1 | ; $Id: VMMRCA.asm 76553 2019-01-01 01:45:53Z vboxsync $
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2 | ;; @file
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3 | ; VMMRC - Raw-mode Context Virtual Machine Monitor assembly routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2019 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 |
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18 | ;*******************************************************************************
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19 | ;* Header Files *
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20 | ;*******************************************************************************
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21 | %include "VBox/asmdefs.mac"
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22 | %include "iprt/x86.mac"
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23 | %include "VBox/sup.mac"
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24 | %include "VBox/vmm/vm.mac"
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25 | %include "VMMInternal.mac"
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26 | %include "VMMRC.mac"
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27 |
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28 |
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29 | ;*******************************************************************************
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30 | ;* Defined Constants And Macros *
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31 | ;*******************************************************************************
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32 | ;; save all registers before loading special values for the faulting.
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33 | %macro SaveAndLoadAll 0
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34 | pushad
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35 | push ds
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36 | push es
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37 | push fs
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38 | push gs
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39 | call NAME(vmmGCTestLoadRegs)
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40 | %endmacro
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41 |
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42 | ;; restore all registers after faulting.
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43 | %macro RestoreAll 0
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44 | pop gs
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45 | pop fs
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46 | pop es
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47 | pop ds
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48 | popad
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49 | %endmacro
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50 |
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51 |
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52 | ;*******************************************************************************
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53 | ;* External Symbols *
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54 | ;*******************************************************************************
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55 | extern IMPNAME(g_VM)
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56 | extern IMPNAME(g_Logger)
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57 | extern IMPNAME(g_RelLogger)
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58 | extern NAME(RTLogLogger)
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59 | extern NAME(vmmRCProbeFireHelper)
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60 | extern NAME(TRPMRCTrapHyperHandlerSetEIP)
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61 |
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62 |
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63 | BEGINCODE
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64 |
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65 | ;/**
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66 | ; * Internal GC logger worker: Logger wrapper.
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67 | ; */
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68 | ;VMMRCDECL(void) vmmGCLoggerWrapper(const char *pszFormat, ...);
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69 | EXPORTEDNAME vmmGCLoggerWrapper
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70 | %ifdef __YASM__
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71 | %ifdef ASM_FORMAT_ELF
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72 | push dword IMP(g_Logger) ; YASM BUG #67! YASMCHECK!
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73 | %else
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74 | push IMP(g_Logger)
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75 | %endif
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76 | %else
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77 | push IMP(g_Logger)
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78 | %endif
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79 | call NAME(RTLogLogger)
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80 | add esp, byte 4
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81 | ret
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82 | ENDPROC vmmGCLoggerWrapper
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83 |
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84 |
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85 | ;/**
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86 | ; * Internal GC logger worker: Logger (release) wrapper.
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87 | ; */
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88 | ;VMMRCDECL(void) vmmGCRelLoggerWrapper(const char *pszFormat, ...);
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89 | EXPORTEDNAME vmmGCRelLoggerWrapper
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90 | %ifdef __YASM__
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91 | %ifdef ASM_FORMAT_ELF
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92 | push dword IMP(g_RelLogger) ; YASM BUG #67! YASMCHECK!
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93 | %else
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94 | push IMP(g_RelLogger)
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95 | %endif
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96 | %else
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97 | push IMP(g_RelLogger)
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98 | %endif
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99 | call NAME(RTLogLogger)
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100 | add esp, byte 4
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101 | ret
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102 | ENDPROC vmmGCRelLoggerWrapper
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103 |
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104 |
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105 | ;;
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106 | ; Enables write protection.
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107 | BEGINPROC vmmGCEnableWP
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108 | push eax
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109 | mov eax, cr0
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110 | or eax, X86_CR0_WRITE_PROTECT
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111 | mov cr0, eax
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112 | pop eax
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113 | ret
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114 | ENDPROC vmmGCEnableWP
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115 |
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116 |
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117 | ;;
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118 | ; Disables write protection.
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119 | BEGINPROC vmmGCDisableWP
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120 | push eax
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121 | mov eax, cr0
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122 | and eax, ~X86_CR0_WRITE_PROTECT
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123 | mov cr0, eax
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124 | pop eax
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125 | ret
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126 | ENDPROC vmmGCDisableWP
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127 |
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128 |
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129 | ;;
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130 | ; Load special register set expected upon faults.
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131 | ; All registers are changed.
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132 | BEGINPROC vmmGCTestLoadRegs
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133 | mov eax, ss
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134 | mov ds, eax
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135 | mov es, eax
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136 | mov fs, eax
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137 | mov gs, eax
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138 | mov edi, 001234567h
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139 | mov esi, 042000042h
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140 | mov ebp, 0ffeeddcch
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141 | mov ebx, 089abcdefh
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142 | mov ecx, 0ffffaaaah
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143 | mov edx, 077778888h
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144 | mov eax, 0f0f0f0f0h
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145 | ret
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146 | ENDPROC vmmGCTestLoadRegs
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147 |
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148 |
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149 | ;;
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150 | ; A Trap 3 testcase.
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151 | GLOBALNAME vmmGCTestTrap3
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152 | SaveAndLoadAll
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153 |
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154 | int 3
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155 | EXPORTEDNAME vmmGCTestTrap3_FaultEIP
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156 |
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157 | RestoreAll
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158 | mov eax, 0ffffffffh
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159 | ret
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160 | ENDPROC vmmGCTestTrap3
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161 |
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162 |
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163 | ;;
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164 | ; A Trap 8 testcase.
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165 | GLOBALNAME vmmGCTestTrap8
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166 | SaveAndLoadAll
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167 |
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168 | sub esp, byte 8
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169 | sidt [esp]
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170 | mov word [esp], 111 ; make any #PF double fault.
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171 | lidt [esp]
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172 | add esp, byte 8
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173 |
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174 | COM_S_CHAR '!'
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175 |
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176 | xor eax, eax
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177 | EXPORTEDNAME vmmGCTestTrap8_FaultEIP
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178 | mov eax, [eax]
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179 |
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180 |
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181 | COM_S_CHAR '2'
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182 |
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183 | RestoreAll
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184 | mov eax, 0ffffffffh
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185 | ret
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186 | ENDPROC vmmGCTestTrap8
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187 |
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188 |
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189 | ;;
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190 | ; A simple Trap 0d testcase.
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191 | GLOBALNAME vmmGCTestTrap0d
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192 | SaveAndLoadAll
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193 |
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194 | push ds
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195 | EXPORTEDNAME vmmGCTestTrap0d_FaultEIP
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196 | ltr [esp]
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197 | pop eax
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198 |
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199 | RestoreAll
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200 | mov eax, 0ffffffffh
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201 | ret
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202 | ENDPROC vmmGCTestTrap0d
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203 |
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204 |
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205 | ;;
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206 | ; A simple Trap 0e testcase.
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207 | GLOBALNAME vmmGCTestTrap0e
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208 | SaveAndLoadAll
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209 |
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210 | xor eax, eax
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211 | EXPORTEDNAME vmmGCTestTrap0e_FaultEIP
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212 | mov eax, [eax]
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213 |
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214 | RestoreAll
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215 | mov eax, 0ffffffffh
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216 | ret
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217 |
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218 | EXPORTEDNAME vmmGCTestTrap0e_ResumeEIP
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219 | RestoreAll
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220 | xor eax, eax
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221 | ret
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222 | ENDPROC vmmGCTestTrap0e
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223 |
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224 |
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225 |
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226 | ;;
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227 | ; Safely reads an MSR.
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228 | ; @returns boolean
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229 | ; @param uMsr The MSR to red.
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230 | ; @param pu64Value Where to return the value on success.
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231 | ;
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232 | GLOBALNAME vmmRCSafeMsrRead
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233 | push ebp
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234 | mov ebp, esp
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235 | pushf
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236 | cli
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237 | push esi
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238 | push edi
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239 | push ebx
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240 | push ebp
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241 |
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242 | mov ecx, [ebp + 8] ; The MSR to read.
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243 | mov eax, 0deadbeefh
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244 | mov edx, 0deadbeefh
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245 |
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246 | TRPM_GP_HANDLER NAME(TRPMRCTrapHyperHandlerSetEIP), .trapped
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247 | rdmsr
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248 |
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249 | mov ecx, [ebp + 0ch] ; Where to store the result.
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250 | mov [ecx], eax
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251 | mov [ecx + 4], edx
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252 |
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253 | mov eax, 1
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254 | .return:
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255 | pop ebp
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256 | pop ebx
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257 | pop edi
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258 | pop esi
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259 | popf
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260 | leave
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261 | ret
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262 |
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263 | .trapped:
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264 | mov eax, 0
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265 | jmp .return
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266 | ENDPROC vmmRCSafeMsrRead
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267 |
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268 |
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269 | ;;
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270 | ; Safely writes an MSR.
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271 | ; @returns boolean
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272 | ; @param uMsr The MSR to red.
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273 | ; @param u64Value The value to write.
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274 | ;
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275 | GLOBALNAME vmmRCSafeMsrWrite
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276 | push ebp
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277 | mov ebp, esp
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278 | pushf
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279 | cli
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280 | push esi
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281 | push edi
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282 | push ebx
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283 | push ebp
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284 |
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285 | mov ecx, [ebp + 8] ; The MSR to write to.
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286 | mov eax, [ebp + 12] ; The value to write.
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287 | mov edx, [ebp + 16]
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288 |
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289 | TRPM_GP_HANDLER NAME(TRPMRCTrapHyperHandlerSetEIP), .trapped
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290 | wrmsr
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291 |
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292 | mov eax, 1
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293 | .return:
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294 | pop ebp
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295 | pop ebx
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296 | pop edi
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297 | pop esi
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298 | popf
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299 | leave
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300 | ret
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301 |
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302 | .trapped:
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303 | mov eax, 0
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304 | jmp .return
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305 | ENDPROC vmmRCSafeMsrWrite
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306 |
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307 |
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308 |
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309 | ;;
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310 | ; The raw-mode context equivalent of SUPTracerFireProbe.
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311 | ;
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312 | ; See also SUPLibTracerA.asm.
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313 | ;
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314 | EXPORTEDNAME VMMRCProbeFire
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315 | push ebp
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316 | mov ebp, esp
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317 |
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318 | ;
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319 | ; Save edx and eflags so we can use them.
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320 | ;
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321 | pushf
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322 | push edx
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323 |
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324 | ;
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325 | ; Get the address of the tracer context record after first checking
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326 | ; that host calls hasn't been disabled.
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327 | ;
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328 | mov edx, IMP(g_VM)
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329 | add edx, [edx + VM.offVMCPU]
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330 | cmp dword [edx + VMCPU.vmm + VMMCPU.cCallRing3Disabled], 0
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331 | jnz .return
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332 | add edx, VMCPU.vmm + VMMCPU.TracerCtx
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333 |
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334 | ;
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335 | ; Save the X86 context.
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336 | ;
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337 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eax], eax
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338 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ecx], ecx
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339 | pop eax
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340 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.edx], eax
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341 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ebx], ebx
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342 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.esi], esi
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343 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.edi], edi
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344 | pop eax
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345 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eflags], eax
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346 | mov eax, [ebp + 4]
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347 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eip], eax
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348 | mov eax, [ebp]
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349 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ebp], eax
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350 | lea eax, [ebp + 4*2]
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351 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.esp], eax
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352 |
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353 | mov ecx, [ebp + 4*2]
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354 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.uVtgProbeLoc], ecx
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355 |
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356 | mov eax, [ecx + 4] ; VTGPROBELOC::idProbe.
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357 | mov [edx + SUPDRVTRACERUSRCTX32.idProbe], eax
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358 | mov dword [edx + SUPDRVTRACERUSRCTX32.cBits], 32
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359 |
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360 | ; Copy the arguments off the stack.
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361 | %macro COPY_ONE_ARG 1
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362 | mov eax, [ebp + 12 + %1 * 4]
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363 | mov [edx + SUPDRVTRACERUSRCTX32.u.X86.aArgs + %1*4], eax
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364 | %endmacro
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365 | COPY_ONE_ARG 0
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366 | COPY_ONE_ARG 1
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367 | COPY_ONE_ARG 2
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368 | COPY_ONE_ARG 3
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369 | COPY_ONE_ARG 4
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370 | COPY_ONE_ARG 5
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371 | COPY_ONE_ARG 6
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372 | COPY_ONE_ARG 7
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373 | COPY_ONE_ARG 8
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374 | COPY_ONE_ARG 9
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375 | COPY_ONE_ARG 10
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376 | COPY_ONE_ARG 11
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377 | COPY_ONE_ARG 12
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378 | COPY_ONE_ARG 13
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379 | COPY_ONE_ARG 14
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380 | COPY_ONE_ARG 15
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381 | COPY_ONE_ARG 16
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382 | COPY_ONE_ARG 17
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383 | COPY_ONE_ARG 18
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384 | COPY_ONE_ARG 19
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385 |
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386 | ;
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387 | ; Call the helper (too lazy to do the VMM structure stuff).
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388 | ;
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389 | mov ecx, IMP(g_VM)
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390 | push ecx
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391 | call NAME(vmmRCProbeFireHelper)
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392 |
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393 | .return:
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394 | leave
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395 | ret
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396 | ENDPROC VMMRCProbeFire
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397 |
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