1 | ; $Id: CPUMRZA.asm 82968 2020-02-04 10:35:17Z vboxsync $
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2 | ;; @file
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3 | ; CPUM - Raw-mode and Ring-0 Context Assembly Routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2020 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 | ;*******************************************************************************
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20 | ;* Header Files *
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21 | ;*******************************************************************************
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22 | %define RT_ASM_WITH_SEH64
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23 | %include "VBox/asmdefs.mac"
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24 | %include "CPUMInternal.mac"
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25 | %include "iprt/x86.mac"
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26 | %include "VBox/vmm/cpum.mac"
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27 | %include "VBox/err.mac"
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28 |
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29 |
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30 |
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31 | BEGINCODE
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32 |
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33 |
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34 | ;;
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35 | ; Saves the host FPU/SSE/AVX state.
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36 | ;
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37 | ; Will return with CR0.EM and CR0.TS cleared! This is the normal state in ring-0.
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38 | ;
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39 | ; @returns VINF_SUCCESS (0) or VINF_CPUM_HOST_CR0_MODIFIED. (EAX)
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40 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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41 | ;
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42 | align 16
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43 | BEGINPROC cpumRZSaveHostFPUState
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44 | push xBP
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45 | SEH64_PUSH_xBP
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46 | mov xBP, xSP
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47 | SEH64_SET_FRAME_xBP 0
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48 | SEH64_END_PROLOGUE
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49 |
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50 | ;
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51 | ; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
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52 | ;
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53 | %ifdef RT_ARCH_AMD64
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54 | %ifdef ASM_CALL64_MSC
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55 | mov r11, rcx
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56 | %else
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57 | mov r11, rdi
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58 | %endif
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59 | %define pCpumCpu r11
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60 | %define pXState r10
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61 | %else
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62 | push ebx
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63 | push esi
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64 | mov ebx, dword [ebp + 8]
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65 | %define pCpumCpu ebx
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66 | %define pXState esi
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67 | %endif
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68 |
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69 | pushf ; The darwin kernel can get upset or upset things if an
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70 | cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
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71 |
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72 | ;
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73 | ; We may have to update CR0, indirectly or directly. We must report any
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74 | ; changes to the VT-x code.
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75 | ;
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76 | CPUMRZ_TOUCH_FPU_CLEAR_CR0_FPU_TRAPS_SET_RC xCX, xAX, pCpumCpu ; xCX is the return value (xAX scratch)
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77 |
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78 | ;
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79 | ; Save the host state (xsave/fxsave will cause thread FPU state to be
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80 | ; loaded on systems where we are allowed to use it in ring-0.
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81 | ;
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82 | CPUMR0_SAVE_HOST
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83 |
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84 | or dword [pCpumCpu + CPUMCPU.fUseFlags], (CPUM_USED_FPU_HOST | CPUM_USED_FPU_SINCE_REM) ; Latter is not necessarily true, but normally yes.
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85 | popf
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86 |
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87 | mov eax, ecx ; The return value from above.
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88 | %ifdef RT_ARCH_X86
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89 | pop esi
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90 | pop ebx
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91 | %endif
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92 | leave
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93 | ret
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94 | %undef pCpumCpu
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95 | %undef pXState
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96 | ENDPROC cpumRZSaveHostFPUState
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97 |
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98 |
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99 | ;;
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100 | ; Saves the guest FPU/SSE/AVX state.
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101 | ;
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102 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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103 | ; @param fLeaveFpuAccessible x86:[ebp+c] gcc:sil msc:dl Whether to restore CR0 and XCR0 on
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104 | ; the way out. Only really applicable to RC.
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105 | ;
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106 | ; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
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107 | ; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
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108 | ; However the compiler docs have different idea:
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109 | ; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
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110 | ; We'll go with the former for now.
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111 | ;
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112 | align 16
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113 | BEGINPROC cpumRZSaveGuestFpuState
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114 | push xBP
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115 | SEH64_PUSH_xBP
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116 | mov xBP, xSP
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117 | SEH64_SET_FRAME_xBP 0
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118 | SEH64_END_PROLOGUE
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119 |
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120 | ;
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121 | ; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
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122 | ;
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123 | %ifdef RT_ARCH_AMD64
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124 | %ifdef ASM_CALL64_MSC
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125 | mov r11, rcx
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126 | %else
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127 | mov r11, rdi
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128 | %endif
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129 | %define pCpumCpu r11
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130 | %define pXState r10
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131 | %else
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132 | push ebx
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133 | push esi
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134 | mov ebx, dword [ebp + 8]
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135 | %define pCpumCpu ebx
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136 | %define pXState esi
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137 | %endif
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138 | pushf ; The darwin kernel can get upset or upset things if an
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139 | cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
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140 |
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141 | %ifdef IN_RC
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142 | mov ecx, cr0 ; ecx = saved cr0
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143 | test ecx, X86_CR0_TS | X86_CR0_EM
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144 | jz .skip_cr0_write
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145 | mov eax, ecx
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146 | and eax, ~(X86_CR0_TS | X86_CR0_EM)
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147 | mov cr0, eax
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148 | .skip_cr0_write:
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149 | %endif
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150 |
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151 | %ifndef VBOX_WITH_KERNEL_USING_XMM
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152 | CPUMR0_SAVE_GUEST
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153 | %else
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154 | ;
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155 | ; The XMM0..XMM15 registers have been saved already. We exploit the
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156 | ; host state here to temporarly save the non-volatile XMM registers,
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157 | ; so we can load the guest ones while saving. This is safe.
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158 | ;
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159 |
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160 | ; Save caller's XMM registers.
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161 | mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0]
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162 | movdqa [pXState + X86FXSTATE.xmm6 ], xmm6
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163 | movdqa [pXState + X86FXSTATE.xmm7 ], xmm7
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164 | movdqa [pXState + X86FXSTATE.xmm8 ], xmm8
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165 | movdqa [pXState + X86FXSTATE.xmm9 ], xmm9
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166 | movdqa [pXState + X86FXSTATE.xmm10], xmm10
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167 | movdqa [pXState + X86FXSTATE.xmm11], xmm11
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168 | movdqa [pXState + X86FXSTATE.xmm12], xmm12
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169 | movdqa [pXState + X86FXSTATE.xmm13], xmm13
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170 | movdqa [pXState + X86FXSTATE.xmm14], xmm14
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171 | movdqa [pXState + X86FXSTATE.xmm15], xmm15
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172 | stmxcsr [pXState + X86FXSTATE.MXCSR]
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173 |
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174 | ; Load the guest XMM register values we already saved in HMR0VMXStartVMWrapXMM.
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175 | mov pXState, [pCpumCpu + CPUMCPU.Guest.pXStateR0]
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176 | movdqa xmm0, [pXState + X86FXSTATE.xmm0]
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177 | movdqa xmm1, [pXState + X86FXSTATE.xmm1]
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178 | movdqa xmm2, [pXState + X86FXSTATE.xmm2]
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179 | movdqa xmm3, [pXState + X86FXSTATE.xmm3]
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180 | movdqa xmm4, [pXState + X86FXSTATE.xmm4]
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181 | movdqa xmm5, [pXState + X86FXSTATE.xmm5]
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182 | movdqa xmm6, [pXState + X86FXSTATE.xmm6]
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183 | movdqa xmm7, [pXState + X86FXSTATE.xmm7]
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184 | movdqa xmm8, [pXState + X86FXSTATE.xmm8]
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185 | movdqa xmm9, [pXState + X86FXSTATE.xmm9]
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186 | movdqa xmm10, [pXState + X86FXSTATE.xmm10]
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187 | movdqa xmm11, [pXState + X86FXSTATE.xmm11]
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188 | movdqa xmm12, [pXState + X86FXSTATE.xmm12]
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189 | movdqa xmm13, [pXState + X86FXSTATE.xmm13]
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190 | movdqa xmm14, [pXState + X86FXSTATE.xmm14]
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191 | movdqa xmm15, [pXState + X86FXSTATE.xmm15]
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192 | ldmxcsr [pXState + X86FXSTATE.MXCSR]
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193 |
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194 | CPUMR0_SAVE_GUEST
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195 |
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196 | ; Restore caller's XMM registers.
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197 | mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0]
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198 | movdqa xmm6, [pXState + X86FXSTATE.xmm6 ]
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199 | movdqa xmm7, [pXState + X86FXSTATE.xmm7 ]
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200 | movdqa xmm8, [pXState + X86FXSTATE.xmm8 ]
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201 | movdqa xmm9, [pXState + X86FXSTATE.xmm9 ]
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202 | movdqa xmm10, [pXState + X86FXSTATE.xmm10]
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203 | movdqa xmm11, [pXState + X86FXSTATE.xmm11]
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204 | movdqa xmm12, [pXState + X86FXSTATE.xmm12]
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205 | movdqa xmm13, [pXState + X86FXSTATE.xmm13]
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206 | movdqa xmm14, [pXState + X86FXSTATE.xmm14]
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207 | movdqa xmm15, [pXState + X86FXSTATE.xmm15]
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208 | ldmxcsr [pXState + X86FXSTATE.MXCSR]
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209 |
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210 | %endif
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211 |
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212 | and dword [pCpumCpu + CPUMCPU.fUseFlags], ~CPUM_USED_FPU_GUEST
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213 | %ifdef IN_RC
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214 | test byte [ebp + 0ch], 1 ; fLeaveFpuAccessible
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215 | jz .no_cr0_restore
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216 | CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET ecx
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217 | .no_cr0_restore:
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218 | %endif
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219 | popf
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220 | %ifdef RT_ARCH_X86
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221 | pop esi
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222 | pop ebx
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223 | %endif
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224 | leave
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225 | ret
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226 | %undef pCpumCpu
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227 | %undef pXState
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228 | ENDPROC cpumRZSaveGuestFpuState
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229 |
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230 |
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231 | ;;
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232 | ; Saves the guest XMM0..15 registers and MXCSR.
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233 | ;
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234 | ; The purpose is to actualize the register state for read-only use, so CR0 is
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235 | ; restored in raw-mode context (so, the FPU/SSE/AVX CPU features can be
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236 | ; inaccessible upon return).
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237 | ;
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238 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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239 | ;
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240 | align 16
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241 | BEGINPROC cpumRZSaveGuestSseRegisters
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242 | push xBP
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243 | SEH64_PUSH_xBP
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244 | mov xBP, xSP
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245 | SEH64_SET_FRAME_xBP 0
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246 | SEH64_END_PROLOGUE
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247 |
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248 | %ifndef VBOX_WITH_KERNEL_USING_XMM
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249 | ;
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250 | ; Load xCX with the guest pXStateR0.
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251 | ;
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252 | %ifdef ASM_CALL64_GCC
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253 | mov xCX, rdi
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254 | %elifdef RT_ARCH_X86
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255 | mov xCX, dword [ebp + 8]
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256 | %endif
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257 | %ifdef IN_RING0
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258 | mov xCX, [xCX + CPUMCPU.Guest.pXStateR0]
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259 | %elifdef IN_RC
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260 | mov xCX, [xCX + CPUMCPU.Guest.pXStateRC]
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261 | %else
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262 | %error "Invalid context!"
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263 | %endif
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264 |
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265 | %ifdef IN_RC
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266 | ; Temporarily grant access to the SSE state. xDX must be preserved until CR0 is restored!
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267 | mov edx, cr0
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268 | test edx, X86_CR0_TS | X86_CR0_EM
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269 | jz .skip_cr0_write
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270 | mov eax, edx
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271 | and eax, ~(X86_CR0_TS | X86_CR0_EM)
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272 | mov cr0, eax
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273 | .skip_cr0_write:
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274 | %endif
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275 |
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276 | ;
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277 | ; Do the job.
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278 | ;
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279 | stmxcsr [xCX + X86FXSTATE.MXCSR]
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280 | movdqa [xCX + X86FXSTATE.xmm0 ], xmm0
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281 | movdqa [xCX + X86FXSTATE.xmm1 ], xmm1
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282 | movdqa [xCX + X86FXSTATE.xmm2 ], xmm2
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283 | movdqa [xCX + X86FXSTATE.xmm3 ], xmm3
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284 | movdqa [xCX + X86FXSTATE.xmm4 ], xmm4
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285 | movdqa [xCX + X86FXSTATE.xmm5 ], xmm5
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286 | movdqa [xCX + X86FXSTATE.xmm6 ], xmm6
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287 | movdqa [xCX + X86FXSTATE.xmm7 ], xmm7
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288 | %if ARCH_BITS == 64
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289 | movdqa [xCX + X86FXSTATE.xmm8 ], xmm8
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290 | movdqa [xCX + X86FXSTATE.xmm9 ], xmm9
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291 | movdqa [xCX + X86FXSTATE.xmm10], xmm10
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292 | movdqa [xCX + X86FXSTATE.xmm11], xmm11
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293 | movdqa [xCX + X86FXSTATE.xmm12], xmm12
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294 | movdqa [xCX + X86FXSTATE.xmm13], xmm13
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295 | movdqa [xCX + X86FXSTATE.xmm14], xmm14
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296 | movdqa [xCX + X86FXSTATE.xmm15], xmm15
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297 | %endif
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298 |
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299 | %ifdef IN_RC
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300 | CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET edx ; Restore CR0 if we changed it above.
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301 | %endif
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302 |
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303 | %endif ; !VBOX_WITH_KERNEL_USING_XMM
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304 |
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305 | leave
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306 | ret
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307 | ENDPROC cpumRZSaveGuestSseRegisters
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308 |
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309 | ;;
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310 | ; Saves the guest YMM0..15 registers.
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311 | ;
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312 | ; The purpose is to actualize the register state for read-only use, so CR0 is
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313 | ; restored in raw-mode context (so, the FPU/SSE/AVX CPU features can be
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314 | ; inaccessible upon return).
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315 | ;
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316 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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317 | ;
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318 | align 16
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319 | BEGINPROC cpumRZSaveGuestAvxRegisters
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320 | push xBP
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321 | SEH64_PUSH_xBP
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322 | mov xBP, xSP
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323 | SEH64_SET_FRAME_xBP 0
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324 | %ifdef IN_RC
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325 | push xBX
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326 | %endif
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327 | SEH64_END_PROLOGUE
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328 |
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329 | ;
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330 | ; Load xCX with the guest pXStateR0.
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331 | ;
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332 | %ifdef ASM_CALL64_GCC
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333 | mov xCX, rdi
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334 | %elifdef RT_ARCH_X86
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335 | mov xCX, dword [ebp + 8]
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336 | %endif
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337 | %ifdef IN_RING0
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338 | mov xCX, [xCX + CPUMCPU.Guest.pXStateR0]
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339 | %elifdef IN_RC
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340 | mov xCX, [xCX + CPUMCPU.Guest.pXStateRC]
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341 | %else
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342 | %error "Invalid context!"
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343 | %endif
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344 |
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345 | %ifdef IN_RC
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346 | ; Temporarily grant access to the SSE state. xBX must be preserved until CR0 is restored!
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347 | mov ebx, cr0
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348 | test ebx, X86_CR0_TS | X86_CR0_EM
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349 | jz .skip_cr0_write
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350 | mov eax, ebx
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351 | and eax, ~(X86_CR0_TS | X86_CR0_EM)
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352 | mov cr0, eax
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353 | .skip_cr0_write:
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354 | %endif
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355 |
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356 | ;
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357 | ; Use XSAVE to do the job.
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358 | ;
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359 | ; Drivers shouldn't use AVX registers without saving+loading:
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360 | ; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
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361 | ; However the compiler docs have different idea:
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362 | ; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
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363 | ; We'll go with the former for now.
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364 | ;
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365 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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366 | mov eax, XSAVE_C_YMM
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367 | %else
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368 | mov eax, XSAVE_C_YMM | XSAVE_C_SSE ; The SSE component includes MXCSR.
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369 | %endif
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370 | xor edx, edx
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371 | %if ARCH_BITS == 64
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372 | o64 xsave [xCX]
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373 | %else
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374 | xsave [xCX]
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375 | %endif
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376 |
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377 | %ifdef IN_RC
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378 | CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET ebx ; Restore CR0 if we changed it above.
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379 | pop xBX
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380 | %endif
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381 | leave
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382 | ret
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383 | ENDPROC cpumRZSaveGuestAvxRegisters
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384 |
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