[55059] | 1 | ; $Id: CPUMR0A.asm 98103 2023-01-17 14:15:46Z vboxsync $
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[14978] | 2 | ;; @file
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[55048] | 3 | ; CPUM - Ring-0 Assembly Routines (supporting HM and IEM).
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[14978] | 4 | ;
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| 5 |
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| 6 | ;
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[98103] | 7 | ; Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[14978] | 8 | ;
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[96407] | 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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[14978] | 11 | ;
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[96407] | 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; SPDX-License-Identifier: GPL-3.0-only
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| 26 | ;
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[14978] | 27 |
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[61058] | 28 |
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[14978] | 29 | ;*******************************************************************************
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| 30 | ;* Header Files *
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| 31 | ;*******************************************************************************
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[61058] | 32 | %define RT_ASM_WITH_SEH64
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| 33 | %include "iprt/asmdefs.mac"
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[14978] | 34 | %include "VBox/asmdefs.mac"
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[35346] | 35 | %include "VBox/vmm/vm.mac"
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[14978] | 36 | %include "VBox/err.mac"
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[35346] | 37 | %include "VBox/vmm/stam.mac"
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[14978] | 38 | %include "CPUMInternal.mac"
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[37955] | 39 | %include "iprt/x86.mac"
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[35346] | 40 | %include "VBox/vmm/cpum.mac"
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[14978] | 41 |
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| 42 |
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[61144] | 43 | BEGINCODE
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[15416] | 44 |
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[61144] | 45 | ;;
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| 46 | ; Makes sure the EMTs have a FPU state associated with them on hosts where we're
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| 47 | ; allowed to use it in ring-0 too.
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| 48 | ;
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| 49 | ; This ensure that we don't have to allocate the state lazily while trying to execute
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| 50 | ; guest code with preemption disabled or worse.
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| 51 | ;
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| 52 | ; @cproto VMMR0_INT_DECL(void) CPUMR0RegisterVCpuThread(PVMCPU pVCpu);
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| 53 | ;
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| 54 | BEGINPROC CPUMR0RegisterVCpuThread
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| 55 | push xBP
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| 56 | SEH64_PUSH_xBP
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| 57 | mov xBP, xSP
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| 58 | SEH64_SET_FRAME_xBP 0
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| 59 | SEH64_END_PROLOGUE
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[20997] | 60 |
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[61348] | 61 | %ifdef VMM_R0_TOUCH_FPU
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| 62 | movdqa xmm0, xmm0 ; hope this is harmless.
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[61144] | 63 | %endif
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[55106] | 64 |
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[61144] | 65 | .return:
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| 66 | xor eax, eax ; paranoia
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| 67 | leave
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| 68 | ret
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| 69 | ENDPROC CPUMR0RegisterVCpuThread
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[14978] | 70 |
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| 71 |
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[61348] | 72 | %ifdef VMM_R0_TOUCH_FPU
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[55106] | 73 | ;;
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[61348] | 74 | ; Touches the host FPU state.
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| 75 | ;
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| 76 | ; @uses nothing (well, maybe cr0)
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| 77 | ;
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[66878] | 78 | %ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
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[61348] | 79 | ALIGNCODE(16)
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[66878] | 80 | %endif
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[61348] | 81 | BEGINPROC CPUMR0TouchHostFpu
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| 82 | push xBP
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| 83 | SEH64_PUSH_xBP
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| 84 | mov xBP, xSP
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| 85 | SEH64_SET_FRAME_xBP 0
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| 86 | SEH64_END_PROLOGUE
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| 87 |
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| 88 | movdqa xmm0, xmm0 ; Hope this is harmless.
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| 89 |
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| 90 | leave
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| 91 | ret
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| 92 | ENDPROC CPUMR0TouchHostFpu
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| 93 | %endif ; VMM_R0_TOUCH_FPU
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| 94 |
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| 95 |
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| 96 | ;;
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[55048] | 97 | ; Saves the host FPU/SSE/AVX state and restores the guest FPU/SSE/AVX state.
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[14978] | 98 | ;
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[61317] | 99 | ; @returns VINF_SUCCESS (0) or VINF_CPUM_HOST_CR0_MODIFIED. (EAX)
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[55059] | 100 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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[14978] | 101 | ;
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[66878] | 102 | ; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
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| 103 | ; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
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| 104 | ; However the compiler docs have different idea:
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| 105 | ; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
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| 106 | ; We'll go with the former for now.
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| 107 | ;
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| 108 | %ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
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[61348] | 109 | ALIGNCODE(16)
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[66878] | 110 | %endif
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[16108] | 111 | BEGINPROC cpumR0SaveHostRestoreGuestFPUState
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[61058] | 112 | push xBP
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| 113 | SEH64_PUSH_xBP
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| 114 | mov xBP, xSP
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| 115 | SEH64_SET_FRAME_xBP 0
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| 116 | SEH64_END_PROLOGUE
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| 117 |
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[55048] | 118 | ;
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| 119 | ; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
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| 120 | ;
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[16108] | 121 | %ifdef RT_ARCH_AMD64
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| 122 | %ifdef RT_OS_WINDOWS
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[55048] | 123 | mov r11, rcx
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[16108] | 124 | %else
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[55048] | 125 | mov r11, rdi
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[16108] | 126 | %endif
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[55048] | 127 | %define pCpumCpu r11
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| 128 | %define pXState r10
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[16108] | 129 | %else
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[55048] | 130 | push ebx
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| 131 | push esi
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[55059] | 132 | mov ebx, dword [ebp + 8]
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[55048] | 133 | %define pCpumCpu ebx
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| 134 | %define pXState esi
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[16108] | 135 | %endif
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| 136 |
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[55048] | 137 | pushf ; The darwin kernel can get upset or upset things if an
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| 138 | cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
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[16108] | 139 |
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[61058] | 140 | ;
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| 141 | ; Save the host state.
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| 142 | ;
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| 143 | test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_HOST
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| 144 | jnz .already_saved_host
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[61144] | 145 |
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[61348] | 146 | CPUMRZ_TOUCH_FPU_CLEAR_CR0_FPU_TRAPS_SET_RC xCX, xAX, pCpumCpu ; xCX is the return value for VT-x; xAX is scratch.
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[61144] | 147 |
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[55106] | 148 | CPUMR0_SAVE_HOST
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[61144] | 149 |
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[61058] | 150 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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| 151 | jmp .load_guest
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| 152 | %endif
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| 153 | .already_saved_host:
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| 154 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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| 155 | ; If we didn't save the host state, we must save the non-volatile XMM registers.
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[91283] | 156 | lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
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[66878] | 157 | stmxcsr [pXState + X86FXSTATE.MXCSR]
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[61068] | 158 | movdqa [pXState + X86FXSTATE.xmm6 ], xmm6
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| 159 | movdqa [pXState + X86FXSTATE.xmm7 ], xmm7
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| 160 | movdqa [pXState + X86FXSTATE.xmm8 ], xmm8
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| 161 | movdqa [pXState + X86FXSTATE.xmm9 ], xmm9
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| 162 | movdqa [pXState + X86FXSTATE.xmm10], xmm10
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| 163 | movdqa [pXState + X86FXSTATE.xmm11], xmm11
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| 164 | movdqa [pXState + X86FXSTATE.xmm12], xmm12
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| 165 | movdqa [pXState + X86FXSTATE.xmm13], xmm13
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| 166 | movdqa [pXState + X86FXSTATE.xmm14], xmm14
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| 167 | movdqa [pXState + X86FXSTATE.xmm15], xmm15
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[61058] | 168 |
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| 169 | ;
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| 170 | ; Load the guest state.
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| 171 | ;
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| 172 | .load_guest:
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| 173 | %endif
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[55106] | 174 | CPUMR0_LOAD_GUEST
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[55048] | 175 |
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[20997] | 176 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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[55048] | 177 | ; Restore the non-volatile xmm registers. ASSUMING 64-bit host.
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[91283] | 178 | lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
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[61068] | 179 | movdqa xmm6, [pXState + X86FXSTATE.xmm6]
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| 180 | movdqa xmm7, [pXState + X86FXSTATE.xmm7]
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| 181 | movdqa xmm8, [pXState + X86FXSTATE.xmm8]
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| 182 | movdqa xmm9, [pXState + X86FXSTATE.xmm9]
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| 183 | movdqa xmm10, [pXState + X86FXSTATE.xmm10]
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| 184 | movdqa xmm11, [pXState + X86FXSTATE.xmm11]
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| 185 | movdqa xmm12, [pXState + X86FXSTATE.xmm12]
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| 186 | movdqa xmm13, [pXState + X86FXSTATE.xmm13]
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| 187 | movdqa xmm14, [pXState + X86FXSTATE.xmm14]
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| 188 | movdqa xmm15, [pXState + X86FXSTATE.xmm15]
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[66878] | 189 | ldmxcsr [pXState + X86FXSTATE.MXCSR]
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[20997] | 190 | %endif
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| 191 |
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[61058] | 192 | or dword [pCpumCpu + CPUMCPU.fUseFlags], (CPUM_USED_FPU_GUEST | CPUM_USED_FPU_SINCE_REM | CPUM_USED_FPU_HOST)
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[87361] | 193 | mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 1
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[55048] | 194 | popf
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[16108] | 195 |
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[61348] | 196 | mov eax, ecx
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[61317] | 197 | .return:
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[55048] | 198 | %ifdef RT_ARCH_X86
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| 199 | pop esi
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| 200 | pop ebx
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[61058] | 201 | %endif
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[55059] | 202 | leave
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[55048] | 203 | ret
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[16108] | 204 | ENDPROC cpumR0SaveHostRestoreGuestFPUState
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| 205 |
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[20540] | 206 |
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[16113] | 207 | ;;
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[55048] | 208 | ; Saves the guest FPU/SSE/AVX state and restores the host FPU/SSE/AVX state.
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[16108] | 209 | ;
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[55059] | 210 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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[16108] | 211 | ;
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[66878] | 212 | ; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
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| 213 | ; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
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| 214 | ; However the compiler docs have different idea:
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| 215 | ; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
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| 216 | ; We'll go with the former for now.
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| 217 | ;
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| 218 | %ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
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[61348] | 219 | ALIGNCODE(16)
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[66878] | 220 | %endif
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[15416] | 221 | BEGINPROC cpumR0SaveGuestRestoreHostFPUState
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[61058] | 222 | push xBP
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| 223 | SEH64_PUSH_xBP
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| 224 | mov xBP, xSP
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| 225 | SEH64_SET_FRAME_xBP 0
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| 226 | SEH64_END_PROLOGUE
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| 227 |
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[55048] | 228 | ;
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| 229 | ; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
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| 230 | ;
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[14978] | 231 | %ifdef RT_ARCH_AMD64
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| 232 | %ifdef RT_OS_WINDOWS
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[55048] | 233 | mov r11, rcx
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[14978] | 234 | %else
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[55048] | 235 | mov r11, rdi
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[14978] | 236 | %endif
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[55048] | 237 | %define pCpumCpu r11
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| 238 | %define pXState r10
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[14978] | 239 | %else
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[55048] | 240 | push ebx
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| 241 | push esi
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[55059] | 242 | mov ebx, dword [ebp + 8]
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[61058] | 243 | %define pCpumCpu ebx
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| 244 | %define pXState esi
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[14978] | 245 | %endif
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[61058] | 246 | pushf ; The darwin kernel can get upset or upset things if an
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| 247 | cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
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[14978] | 248 |
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[61058] | 249 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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[55048] | 250 | ;
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[61058] | 251 | ; Copy non-volatile XMM registers to the host state so we can use
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| 252 | ; them while saving the guest state (we've gotta do this anyway).
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[55048] | 253 | ;
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[91283] | 254 | lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
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[66878] | 255 | stmxcsr [pXState + X86FXSTATE.MXCSR]
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[61068] | 256 | movdqa [pXState + X86FXSTATE.xmm6], xmm6
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| 257 | movdqa [pXState + X86FXSTATE.xmm7], xmm7
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| 258 | movdqa [pXState + X86FXSTATE.xmm8], xmm8
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| 259 | movdqa [pXState + X86FXSTATE.xmm9], xmm9
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| 260 | movdqa [pXState + X86FXSTATE.xmm10], xmm10
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| 261 | movdqa [pXState + X86FXSTATE.xmm11], xmm11
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| 262 | movdqa [pXState + X86FXSTATE.xmm12], xmm12
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| 263 | movdqa [pXState + X86FXSTATE.xmm13], xmm13
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| 264 | movdqa [pXState + X86FXSTATE.xmm14], xmm14
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| 265 | movdqa [pXState + X86FXSTATE.xmm15], xmm15
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[61058] | 266 | %endif
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[14978] | 267 |
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[61058] | 268 | ;
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| 269 | ; Save the guest state if necessary.
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| 270 | ;
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| 271 | test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_GUEST
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| 272 | jz .load_only_host
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[20535] | 273 |
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[61058] | 274 | %ifdef VBOX_WITH_KERNEL_USING_XMM
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| 275 | ; Load the guest XMM register values we already saved in HMR0VMXStartVMWrapXMM.
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[91281] | 276 | lea pXState, [pCpumCpu + CPUMCPU.Guest.XState]
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[61068] | 277 | movdqa xmm0, [pXState + X86FXSTATE.xmm0]
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| 278 | movdqa xmm1, [pXState + X86FXSTATE.xmm1]
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| 279 | movdqa xmm2, [pXState + X86FXSTATE.xmm2]
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| 280 | movdqa xmm3, [pXState + X86FXSTATE.xmm3]
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| 281 | movdqa xmm4, [pXState + X86FXSTATE.xmm4]
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| 282 | movdqa xmm5, [pXState + X86FXSTATE.xmm5]
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| 283 | movdqa xmm6, [pXState + X86FXSTATE.xmm6]
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| 284 | movdqa xmm7, [pXState + X86FXSTATE.xmm7]
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| 285 | movdqa xmm8, [pXState + X86FXSTATE.xmm8]
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| 286 | movdqa xmm9, [pXState + X86FXSTATE.xmm9]
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| 287 | movdqa xmm10, [pXState + X86FXSTATE.xmm10]
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| 288 | movdqa xmm11, [pXState + X86FXSTATE.xmm11]
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| 289 | movdqa xmm12, [pXState + X86FXSTATE.xmm12]
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| 290 | movdqa xmm13, [pXState + X86FXSTATE.xmm13]
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| 291 | movdqa xmm14, [pXState + X86FXSTATE.xmm14]
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| 292 | movdqa xmm15, [pXState + X86FXSTATE.xmm15]
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[66878] | 293 | ldmxcsr [pXState + X86FXSTATE.MXCSR]
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[61058] | 294 | %endif
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[55106] | 295 | CPUMR0_SAVE_GUEST
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[61058] | 296 |
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| 297 | ;
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| 298 | ; Load the host state.
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| 299 | ;
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| 300 | .load_only_host:
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[55106] | 301 | CPUMR0_LOAD_HOST
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[14978] | 302 |
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[61144] | 303 | ; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
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| 304 | ; in cpumRZSaveHostFPUState.
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| 305 | mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
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[61348] | 306 | CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
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[61058] | 307 | and dword [pCpumCpu + CPUMCPU.fUseFlags], ~(CPUM_USED_FPU_GUEST | CPUM_USED_FPU_HOST)
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[87361] | 308 | mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 0
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[61058] | 309 |
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[55048] | 310 | popf
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| 311 | %ifdef RT_ARCH_X86
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| 312 | pop esi
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| 313 | pop ebx
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[61058] | 314 | %endif
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[55059] | 315 | leave
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[55048] | 316 | ret
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| 317 | %undef pCpumCpu
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| 318 | %undef pXState
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[15416] | 319 | ENDPROC cpumR0SaveGuestRestoreHostFPUState
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| 320 |
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[16108] | 321 |
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[61058] | 322 | %if ARCH_BITS == 32
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| 323 | %ifdef VBOX_WITH_64_BITS_GUESTS
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[14978] | 324 | ;;
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[55048] | 325 | ; Restores the host's FPU/SSE/AVX state from pCpumCpu->Host.
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[14978] | 326 | ;
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[55059] | 327 | ; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
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[14978] | 328 | ;
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[66878] | 329 | %ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
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[61348] | 330 | ALIGNCODE(16)
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[66878] | 331 | %endif
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[15416] | 332 | BEGINPROC cpumR0RestoreHostFPUState
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[55048] | 333 | ;
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| 334 | ; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
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| 335 | ;
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[55059] | 336 | push ebp
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| 337 | mov ebp, esp
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[55048] | 338 | push ebx
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| 339 | push esi
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[55059] | 340 | mov ebx, dword [ebp + 8]
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[61058] | 341 | %define pCpumCpu ebx
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| 342 | %define pXState esi
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[14978] | 343 |
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[55048] | 344 | ;
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[61058] | 345 | ; Restore host CPU state.
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[55048] | 346 | ;
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| 347 | pushf ; The darwin kernel can get upset or upset things if an
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| 348 | cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
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[20535] | 349 |
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[55106] | 350 | CPUMR0_LOAD_HOST
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[14978] | 351 |
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[61144] | 352 | ; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
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| 353 | ; in cpumRZSaveHostFPUState.
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| 354 | ;; @todo What about XCR0?
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| 355 | mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
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[61348] | 356 | CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
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| 357 |
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[61058] | 358 | and dword [pCpumCpu + CPUMCPU.fUseFlags], ~CPUM_USED_FPU_HOST
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[55048] | 359 | popf
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| 360 |
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| 361 | pop esi
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| 362 | pop ebx
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[55059] | 363 | leave
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[55048] | 364 | ret
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[61058] | 365 | %undef pCpumCPu
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| 366 | %undef pXState
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[15416] | 367 | ENDPROC cpumR0RestoreHostFPUState
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[61058] | 368 | %endif ; VBOX_WITH_64_BITS_GUESTS
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| 369 | %endif ; ARCH_BITS == 32
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[15416] | 370 |
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