| 1 | ; $Id: HWACCMR0A.asm 19 2007-01-15 13:07:05Z vboxsync $
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| 2 | ;; @file
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| 3 | ; VMXM - R0 vmx helpers
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006 InnoTek Systemberatung GmbH
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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 as published by the Free Software Foundation,
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| 13 | ; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | ; distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | ; be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; If you received this file as part of a commercial VirtualBox
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| 18 | ; distribution, then only the terms of your commercial VirtualBox
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| 19 | ; license agreement apply instead of the previous paragraph.
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| 20 | ;
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| 21 |
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| 22 | ;*******************************************************************************
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| 23 | ;* Header Files *
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| 24 | ;*******************************************************************************
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| 25 | %include "VBox/asmdefs.mac"
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| 26 | %include "VBox/err.mac"
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| 27 | %include "VBox/hwacc_vmx.mac"
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| 28 | %include "VBox/cpum.mac"
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| 29 | %include "VBox/x86.mac"
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| 30 |
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| 31 | %ifdef __OS2__ ;; @todo build cvs nasm like on OS X.
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| 32 | %macro vmwrite 2,
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| 33 | int3
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| 34 | %endmacro
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| 35 | %define vmlaunch int3
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| 36 | %define vmresume int3
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| 37 | %endif
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| 38 |
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| 39 | BEGINCODE
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| 40 |
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| 41 | ;/**
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| 42 | ; * Prepares for and executes VMLAUNCH
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| 43 | ; *
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| 44 | ; * @note identical to VMXResumeVM, except for the vmlaunch/vmresume opcode
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| 45 | ; *
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| 46 | ; * @returns VBox status code
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| 47 | ; * @param pCtx Guest context
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| 48 | ; */
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| 49 | BEGINPROC VMXStartVM
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| 50 | push ebp
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| 51 | mov ebp, esp
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| 52 |
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| 53 | ;/* First we have to save some final CPU context registers. */
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| 54 | push vmlaunch_done
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| 55 | mov eax, VMX_VMCS_HOST_RIP ;/* return address (too difficult to continue after VMLAUNCH?) */
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| 56 | vmwrite eax, [esp]
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| 57 | ;/* @todo assumes success... */
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| 58 | add esp, 4
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| 59 |
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| 60 | ;/* Manual save and restore:
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| 61 | ; * - General purpose registers except RIP, RSP
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| 62 | ; *
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| 63 | ; * Trashed:
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| 64 | ; * - CR2 (we don't care)
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| 65 | ; * - LDTR (reset to 0)
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| 66 | ; * - DRx (presumably not changed at all)
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| 67 | ; * - DR7 (reset to 0x400)
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| 68 | ; * - EFLAGS (reset to BIT(1); not relevant)
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| 69 | ; *
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| 70 | ; */
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| 71 |
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| 72 | ;/* Save all general purpose host registers. */
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| 73 | pushad
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| 74 |
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| 75 | ;/* Save segment registers */
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| 76 | push ds
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| 77 | push es
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| 78 | push fs
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| 79 | push gs
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| 80 |
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| 81 | ;/* Save the Guest CPU context pointer. */
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| 82 | mov esi, [ebp + 8] ; pCtx
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| 83 | push esi
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| 84 |
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| 85 | ; Save LDTR
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| 86 | xor eax, eax
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| 87 | sldt ax
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| 88 | push eax
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| 89 |
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| 90 | ; Restore CR2
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| 91 | mov ebx, [esi + CPUMCTX.cr2]
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| 92 | mov cr2, ebx
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| 93 |
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| 94 | mov eax, VMX_VMCS_HOST_RSP
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| 95 | vmwrite eax, esp
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| 96 | ;/* @todo assumes success... */
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| 97 | ;/* Don't mess with ESP anymore!! */
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| 98 |
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| 99 | ;/* Restore Guest's general purpose registers. */
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| 100 | mov eax, [esi + CPUMCTX.eax]
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| 101 | mov ebx, [esi + CPUMCTX.ebx]
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| 102 | mov ecx, [esi + CPUMCTX.ecx]
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| 103 | mov edx, [esi + CPUMCTX.edx]
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| 104 | mov edi, [esi + CPUMCTX.edi]
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| 105 | mov ebp, [esi + CPUMCTX.ebp]
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| 106 | mov esi, [esi + CPUMCTX.esi]
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| 107 |
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| 108 | vmlaunch
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| 109 | jmp vmlaunch_done; ;/* here if vmlaunch detected a failure. */
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| 110 |
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| 111 | ALIGNCODE(16)
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| 112 | vmlaunch_done:
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| 113 | jnc vmxstart_good
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| 114 |
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| 115 | pop eax ; saved LDTR
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| 116 | lldt ax
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| 117 |
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| 118 | add esp, 4 ; pCtx
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| 119 |
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| 120 | ; Restore segment registers
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| 121 | pop gs
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| 122 | pop fs
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| 123 | pop es
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| 124 | pop ds
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| 125 |
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| 126 | ;/* Restore all general purpose host registers. */
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| 127 | popad
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| 128 | mov eax, VERR_VMX_INVALID_VMXON_PTR
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| 129 | jmp vmstart_end
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| 130 |
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| 131 | vmxstart_good:
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| 132 | jnz vmxstart_success
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| 133 |
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| 134 | pop eax ; saved LDTR
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| 135 | lldt ax
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| 136 |
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| 137 | add esp, 4 ; pCtx
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| 138 |
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| 139 | ; Restore segment registers
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| 140 | pop gs
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| 141 | pop fs
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| 142 | pop es
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| 143 | pop ds
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| 144 | ;/* Restore all general purpose host registers. */
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| 145 | popad
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| 146 | mov eax, VERR_VMX_UNABLE_TO_START_VM
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| 147 | jmp vmstart_end
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| 148 |
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| 149 | vmxstart_success:
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| 150 | push edi
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| 151 | mov edi, dword [esp+8] ;/* pCtx */
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| 152 |
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| 153 | mov [ss:edi + CPUMCTX.eax], eax
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| 154 | mov [ss:edi + CPUMCTX.ebx], ebx
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| 155 | mov [ss:edi + CPUMCTX.ecx], ecx
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| 156 | mov [ss:edi + CPUMCTX.edx], edx
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| 157 | mov [ss:edi + CPUMCTX.esi], esi
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| 158 | mov [ss:edi + CPUMCTX.ebp], ebp
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| 159 | pop dword [ss:edi + CPUMCTX.edi] ; guest edi we pushed above
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| 160 |
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| 161 | pop eax ; saved LDTR
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| 162 | lldt ax
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| 163 |
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| 164 | add esp, 4 ; pCtx
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| 165 |
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| 166 | ; Restore segment registers
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| 167 | pop gs
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| 168 | pop fs
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| 169 | pop es
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| 170 | pop ds
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| 171 |
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| 172 | ; Restore general purpose registers
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| 173 | popad
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| 174 |
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| 175 | mov eax, VINF_SUCCESS
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| 176 |
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| 177 | vmstart_end:
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| 178 | pop ebp
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| 179 | ret
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| 180 | ENDPROC VMStartVM
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| 181 |
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| 182 |
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| 183 | ;/**
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| 184 | ; * Prepares for and executes VMRESUME
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| 185 | ; *
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| 186 | ; * @note identical to VMXStartVM, except for the vmlaunch/vmresume opcode
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| 187 | ; *
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| 188 | ; * @returns VBox status code
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| 189 | ; * @param pCtx Guest context
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| 190 | ; */
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| 191 | BEGINPROC VMXResumeVM
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| 192 | push ebp
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| 193 | mov ebp, esp
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| 194 |
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| 195 | ;/* First we have to save some final CPU context registers. */
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| 196 | push vmresume_done
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| 197 | mov eax, VMX_VMCS_HOST_RIP ;/* return address (too difficult to continue after VMLAUNCH?) */
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| 198 | vmwrite eax, [esp]
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| 199 | ;/* @todo assumes success... */
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| 200 | add esp, 4
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| 201 |
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| 202 | ;/* Manual save and restore:
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| 203 | ; * - General purpose registers except RIP, RSP
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| 204 | ; *
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| 205 | ; * Trashed:
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| 206 | ; * - CR2 (we don't care)
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| 207 | ; * - LDTR (reset to 0)
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| 208 | ; * - DRx (presumably not changed at all)
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| 209 | ; * - DR7 (reset to 0x400)
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| 210 | ; * - EFLAGS (reset to BIT(1); not relevant)
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| 211 | ; *
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| 212 | ; */
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| 213 |
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| 214 | ;/* Save all general purpose host registers. */
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| 215 | pushad
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| 216 |
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| 217 | ;/* Save segment registers */
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| 218 | push ds
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| 219 | push es
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| 220 | push fs
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| 221 | push gs
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| 222 |
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| 223 | ;/* Save the Guest CPU context pointer. */
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| 224 | mov esi, [ebp + 8] ; pCtx
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| 225 | push esi
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| 226 |
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| 227 | ; Save LDTR
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| 228 | xor eax, eax
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| 229 | sldt ax
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| 230 | push eax
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| 231 |
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| 232 | ; Restore CR2
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| 233 | mov ebx, [esi + CPUMCTX.cr2]
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| 234 | mov cr2, ebx
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| 235 |
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| 236 | mov eax, VMX_VMCS_HOST_RSP
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| 237 | vmwrite eax, esp
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| 238 | ;/* @todo assumes success... */
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| 239 | ;/* Don't mess with ESP anymore!! */
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| 240 |
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| 241 | ;/* Restore Guest's general purpose registers. */
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| 242 | mov eax, [esi + CPUMCTX.eax]
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| 243 | mov ebx, [esi + CPUMCTX.ebx]
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| 244 | mov ecx, [esi + CPUMCTX.ecx]
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| 245 | mov edx, [esi + CPUMCTX.edx]
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| 246 | mov edi, [esi + CPUMCTX.edi]
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| 247 | mov ebp, [esi + CPUMCTX.ebp]
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| 248 | mov esi, [esi + CPUMCTX.esi]
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| 249 |
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| 250 | vmresume
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| 251 | jmp vmresume_done; ;/* here if vmresume detected a failure. */
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| 252 |
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| 253 | ALIGNCODE(16)
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| 254 | vmresume_done:
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| 255 | jnc vmresume_good
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| 256 |
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| 257 | pop eax ; saved LDTR
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| 258 | lldt ax
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| 259 |
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| 260 | add esp, 4 ; pCtx
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| 261 |
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| 262 | ; Restore segment registers
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| 263 | pop gs
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| 264 | pop fs
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| 265 | pop es
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| 266 | pop ds
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| 267 |
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| 268 | ;/* Restore all general purpose host registers. */
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| 269 | popad
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| 270 | mov eax, VERR_VMX_INVALID_VMXON_PTR
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| 271 | jmp vmresume_end
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| 272 |
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| 273 | vmresume_good:
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| 274 | jnz vmresume_success
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| 275 |
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| 276 | pop eax ; saved LDTR
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| 277 | lldt ax
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| 278 |
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| 279 | add esp, 4 ; pCtx
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| 280 |
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| 281 | ; Restore segment registers
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| 282 | pop gs
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| 283 | pop fs
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| 284 | pop es
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| 285 | pop ds
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| 286 | ;/* Restore all general purpose host registers. */
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| 287 | popad
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| 288 | mov eax, VERR_VMX_UNABLE_TO_RESUME_VM
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| 289 | jmp vmresume_end
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| 290 |
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| 291 | vmresume_success:
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| 292 | push edi
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| 293 | mov edi, dword [esp+8] ;/* pCtx */
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| 294 |
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| 295 | mov [ss:edi + CPUMCTX.eax], eax
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| 296 | mov [ss:edi + CPUMCTX.ebx], ebx
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| 297 | mov [ss:edi + CPUMCTX.ecx], ecx
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| 298 | mov [ss:edi + CPUMCTX.edx], edx
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| 299 | mov [ss:edi + CPUMCTX.esi], esi
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| 300 | mov [ss:edi + CPUMCTX.ebp], ebp
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| 301 | pop dword [ss:edi + CPUMCTX.edi] ; guest edi we pushed above
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| 302 |
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| 303 | pop eax ; saved LDTR
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| 304 | lldt ax
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| 305 |
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| 306 | add esp, 4 ; pCtx
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| 307 |
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| 308 | ; Restore segment registers
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| 309 | pop gs
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| 310 | pop fs
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| 311 | pop es
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| 312 | pop ds
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| 313 |
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| 314 | ; Restore general purpose registers
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| 315 | popad
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| 316 |
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| 317 | mov eax, VINF_SUCCESS
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| 318 |
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| 319 | vmresume_end:
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| 320 | pop ebp
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| 321 | ret
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| 322 | ENDPROC VMXResumeVM
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| 323 |
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| 324 |
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| 325 |
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| 326 |
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| 327 | ;/**
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| 328 | ; * Prepares for and executes VMRUN
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| 329 | ; *
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| 330 | ; * @returns VBox status code
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| 331 | ; * @param pVMCBHostPhys Physical address of host VMCB
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| 332 | ; * @param pVMCBPhys Physical address of guest VMCB
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| 333 | ; * @param pCtx Guest context
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| 334 | ; */
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| 335 | BEGINPROC SVMVMRun
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| 336 | push ebp
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| 337 | mov ebp, esp
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| 338 |
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| 339 | ;/* Manual save and restore:
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| 340 | ; * - General purpose registers except RIP, RSP, RAX
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| 341 | ; *
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| 342 | ; * Trashed:
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| 343 | ; * - CR2 (we don't care)
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| 344 | ; * - LDTR (reset to 0)
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| 345 | ; * - DRx (presumably not changed at all)
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| 346 | ; * - DR7 (reset to 0x400)
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| 347 | ; */
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| 348 |
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| 349 | ;/* Save all general purpose host registers. */
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| 350 | pushad
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| 351 |
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| 352 | ; /* Clear fs and gs as a safety precaution. Maybe not necessary. */
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| 353 | push fs
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| 354 | push gs
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| 355 | xor eax, eax
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| 356 | mov fs, eax
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| 357 | mov gs, eax
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| 358 |
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| 359 | ;/* Save the Guest CPU context pointer. */
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| 360 | mov esi, [ebp + 24] ; pCtx
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| 361 | push esi
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| 362 |
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| 363 | ; Restore CR2
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| 364 | mov ebx, [esi + CPUMCTX.cr2]
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| 365 | mov cr2, ebx
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| 366 |
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| 367 | ; save host fs, gs, sysenter msr etc
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| 368 | mov eax, [ebp + 8] ; pVMCBHostPhys (64 bits physical address; take low dword only)
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| 369 | push eax ; save for the vmload after vmrun
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| 370 | DB 0x0F, 0x01, 0xDB ; VMSAVE
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| 371 |
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| 372 | ; setup eax for VMLOAD
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| 373 | mov eax, [ebp + 16] ; pVMCBPhys (64 bits physical address; take low dword only)
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| 374 |
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| 375 | ;/* Restore Guest's general purpose registers. */
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| 376 | ;/* EAX is loaded from the VMCB by VMRUN */
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| 377 | mov ebx, [esi + CPUMCTX.ebx]
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| 378 | mov ecx, [esi + CPUMCTX.ecx]
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| 379 | mov edx, [esi + CPUMCTX.edx]
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| 380 | mov edi, [esi + CPUMCTX.edi]
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| 381 | mov ebp, [esi + CPUMCTX.ebp]
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| 382 | mov esi, [esi + CPUMCTX.esi]
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| 383 |
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| 384 | ; Clear the global interrupt flag & execute sti to make sure external interrupts cause a world switch
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| 385 | DB 0x0f, 0x01, 0xDD ; CLGI
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| 386 | sti
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| 387 |
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| 388 | ; load guest fs, gs, sysenter msr etc
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| 389 | DB 0x0f, 0x01, 0xDA ; VMLOAD
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| 390 | ; run the VM
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| 391 | DB 0x0F, 0x01, 0xD8 ; VMRUN
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| 392 |
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| 393 | ;/* EAX is in the VMCB already; we can use it here. */
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| 394 |
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| 395 | ; save guest fs, gs, sysenter msr etc
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| 396 | DB 0x0F, 0x01, 0xDB ; VMSAVE
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| 397 |
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| 398 | ; load host fs, gs, sysenter msr etc
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| 399 | pop eax ; pushed above
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| 400 | DB 0x0F, 0x01, 0xDA ; VMLOAD
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| 401 |
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| 402 | ; Set the global interrupt flag again, but execute cli to make sure IF=0.
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| 403 | cli
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| 404 | DB 0x0f, 0x01, 0xDC ; STGI
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| 405 |
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| 406 | pop eax ; pCtx
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| 407 |
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| 408 | mov [ss:eax + CPUMCTX.ebx], ebx
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| 409 | mov [ss:eax + CPUMCTX.ecx], ecx
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| 410 | mov [ss:eax + CPUMCTX.edx], edx
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| 411 | mov [ss:eax + CPUMCTX.esi], esi
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| 412 | mov [ss:eax + CPUMCTX.edi], edi
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| 413 | mov [ss:eax + CPUMCTX.ebp], ebp
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| 414 |
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| 415 | ; Restore fs & gs
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| 416 | pop gs
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| 417 | pop fs
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| 418 |
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| 419 | ; Restore general purpose registers
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| 420 | popad
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| 421 |
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| 422 | mov eax, VINF_SUCCESS
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| 423 |
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| 424 | pop ebp
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| 425 | ret
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| 426 | ENDPROC SVMVMRun
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