; $Id$

;; @file

; VMMGC - Raw-mode Context Virtual Machine Monitor assembly routines.

;

;

; Copyright (C) 2006-2012 Oracle Corporation

;

; This file is part of VirtualBox Open Source Edition (OSE), as

; available from http://www.virtualbox.org. This file is free software;

; you can redistribute it and/or modify it under the terms of the GNU

; General Public License (GPL) as published by the Free Software

; Foundation, in version 2 as it comes in the "COPYING" file of the

; VirtualBox OSE distribution. VirtualBox OSE is distributed in the

; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.

;

;*******************************************************************************

;* Header Files *

;*******************************************************************************

%include "VBox/asmdefs.mac"

%include "iprt/x86.mac"

%include "VBox/sup.mac"

%include "VBox/vmm/vm.mac"

%include "VMMInternal.mac"

%include "VMMRC.mac"

;*******************************************************************************

;* Defined Constants And Macros *

;*******************************************************************************

;; save all registers before loading special values for the faulting.

%macro SaveAndLoadAll 0

pushad

push ds

push es

push fs

push gs

call NAME(vmmGCTestLoadRegs)

%endmacro

;; restore all registers after faulting.

%macro RestoreAll 0

pop gs

pop fs

pop es

pop ds

popad

%endmacro

;*******************************************************************************

;* External Symbols *

;*******************************************************************************

extern IMPNAME(g_VM)

extern IMPNAME(g_Logger)

extern IMPNAME(g_RelLogger)

extern NAME(RTLogLogger)

extern NAME(vmmRCProbeFireHelper)

extern NAME(TRPMRCTrapHyperHandlerSetEIP)

BEGINCODE

;/**

; * Internal GC logger worker: Logger wrapper.

; */

;VMMRCDECL(void) vmmGCLoggerWrapper(const char *pszFormat, ...);

EXPORTEDNAME vmmGCLoggerWrapper

%ifdef __YASM__

%ifdef ASM_FORMAT_ELF

push dword IMP(g_Logger) ; YASM BUG #67! YASMCHECK!

%else

push IMP(g_Logger)

%endif

%else

push IMP(g_Logger)

%endif

call NAME(RTLogLogger)

add esp, byte 4

ret

ENDPROC vmmGCLoggerWrapper

;/**

; * Internal GC logger worker: Logger (release) wrapper.

; */

;VMMRCDECL(void) vmmGCRelLoggerWrapper(const char *pszFormat, ...);

EXPORTEDNAME vmmGCRelLoggerWrapper

%ifdef __YASM__

%ifdef ASM_FORMAT_ELF

push dword IMP(g_RelLogger) ; YASM BUG #67! YASMCHECK!

%else

push IMP(g_RelLogger)

%endif

%else

push IMP(g_RelLogger)

%endif

call NAME(RTLogLogger)

add esp, byte 4

ret

ENDPROC vmmGCRelLoggerWrapper

;;

; Enables write protection.

BEGINPROC vmmGCEnableWP

push eax

mov eax, cr0

or eax, X86_CR0_WRITE_PROTECT

mov cr0, eax

pop eax

ret

ENDPROC vmmGCEnableWP

;;

; Disables write protection.

BEGINPROC vmmGCDisableWP

push eax

mov eax, cr0

and eax, ~X86_CR0_WRITE_PROTECT

mov cr0, eax

pop eax

ret

ENDPROC vmmGCDisableWP

;;

; Load special register set expected upon faults.

; All registers are changed.

BEGINPROC vmmGCTestLoadRegs

mov eax, ss

mov ds, eax

mov es, eax

mov fs, eax

mov gs, eax

mov edi, 001234567h

mov esi, 042000042h

mov ebp, 0ffeeddcch

mov ebx, 089abcdefh

mov ecx, 0ffffaaaah

mov edx, 077778888h

mov eax, 0f0f0f0f0h

ret

ENDPROC vmmGCTestLoadRegs

;;

; A Trap 3 testcase.

GLOBALNAME vmmGCTestTrap3

SaveAndLoadAll

int 3

EXPORTEDNAME vmmGCTestTrap3_FaultEIP

RestoreAll

mov eax, 0ffffffffh

ret

ENDPROC vmmGCTestTrap3

;;

; A Trap 8 testcase.

GLOBALNAME vmmGCTestTrap8

SaveAndLoadAll

sub esp, byte 8

sidt [esp]

mov word [esp], 111 ; make any #PF double fault.

lidt [esp]

add esp, byte 8

COM_S_CHAR '!'

xor eax, eax

EXPORTEDNAME vmmGCTestTrap8_FaultEIP

mov eax, [eax]

COM_S_CHAR '2'

RestoreAll

mov eax, 0ffffffffh

ret

ENDPROC vmmGCTestTrap8

;;

; A simple Trap 0d testcase.

GLOBALNAME vmmGCTestTrap0d

SaveAndLoadAll

push ds

EXPORTEDNAME vmmGCTestTrap0d_FaultEIP

ltr [esp]

pop eax

RestoreAll

mov eax, 0ffffffffh

ret

ENDPROC vmmGCTestTrap0d

;;

; A simple Trap 0e testcase.

GLOBALNAME vmmGCTestTrap0e

SaveAndLoadAll

xor eax, eax

EXPORTEDNAME vmmGCTestTrap0e_FaultEIP

mov eax, [eax]

RestoreAll

mov eax, 0ffffffffh

ret

EXPORTEDNAME vmmGCTestTrap0e_ResumeEIP

RestoreAll

xor eax, eax

ret

ENDPROC vmmGCTestTrap0e

;;

; Safely reads an MSR.

; @returns boolean

; @param uMsr The MSR to red.

; @param pu64Value Where to return the value on success.

;

GLOBALNAME vmmRCSafeMsrRead

push ebp

mov ebp, esp

pushf

cli

push esi

push edi

push ebx

push ebp

mov ecx, [ebp + 8] ; The MSR to read.

mov eax, 0deadbeefh

mov edx, 0deadbeefh

TRPM_GP_HANDLER NAME(TRPMRCTrapHyperHandlerSetEIP), .trapped

rdmsr

mov ecx, [ebp + 0ch] ; Where to store the result.

mov [ecx], eax

mov [ecx + 4], edx

mov eax, 1

.return:

pop ebp

pop ebx

pop edi

pop esi

popf

leave

ret

.trapped:

mov eax, 0

jmp .return

ENDPROC vmmRCSafeMsrRead

;;

; Safely writes an MSR.

; @returns boolean

; @param uMsr The MSR to red.

; @param u64Value The value to write.

;

GLOBALNAME vmmRCSafeMsrWrite

push ebp

mov ebp, esp

pushf

cli

push esi

push edi

push ebx

push ebp

mov ecx, [ebp + 8] ; The MSR to write to.

mov eax, [ebp + 12] ; The value to write.

mov edx, [ebp + 16]

TRPM_GP_HANDLER NAME(TRPMRCTrapHyperHandlerSetEIP), .trapped

wrmsr

mov eax, 1

.return:

pop ebp

pop ebx

pop edi

pop esi

popf

leave

ret

.trapped:

mov eax, 0

jmp .return

ENDPROC vmmRCSafeMsrWrite

;;

; The raw-mode context equivalent of SUPTracerFireProbe.

;

; See also SUPLibTracerA.asm.

;

EXPORTEDNAME VMMRCProbeFire

push ebp

mov ebp, esp

;

; Save edx and eflags so we can use them.

;

pushf

push edx

;

; Get the address of the tracer context record after first checking

; that host calls hasn't been disabled.

;

mov edx, IMP(g_VM)

add edx, [edx + VM.offVMCPU]

cmp dword [edx + VMCPU.vmm + VMMCPU.cCallRing3Disabled], 0

jnz .return

add edx, VMCPU.vmm + VMMCPU.TracerCtx

;

; Save the X86 context.

;

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eax], eax

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ecx], ecx

pop eax

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.edx], eax

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ebx], ebx

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.esi], esi

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.edi], edi

pop eax

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eflags], eax

mov eax, [ebp + 4]

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.eip], eax

mov eax, [ebp]

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.ebp], eax

lea eax, [ebp + 4*2]

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.esp], eax

mov ecx, [ebp + 4*2]

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.uVtgProbeLoc], ecx

mov eax, [ecx + 4] ; VTGPROBELOC::idProbe.

mov [edx + SUPDRVTRACERUSRCTX32.idProbe], eax

mov dword [edx + SUPDRVTRACERUSRCTX32.cBits], 32

; Copy the arguments off the stack.

%macro COPY_ONE_ARG 1

mov eax, [ebp + 12 + %1 * 4]

mov [edx + SUPDRVTRACERUSRCTX32.u.X86.aArgs + %1*4], eax

%endmacro

COPY_ONE_ARG 0

COPY_ONE_ARG 1

COPY_ONE_ARG 2

COPY_ONE_ARG 3

COPY_ONE_ARG 4

COPY_ONE_ARG 5

COPY_ONE_ARG 6

COPY_ONE_ARG 7

COPY_ONE_ARG 8

COPY_ONE_ARG 9

COPY_ONE_ARG 10

COPY_ONE_ARG 11

COPY_ONE_ARG 12

COPY_ONE_ARG 13

COPY_ONE_ARG 14

COPY_ONE_ARG 15

COPY_ONE_ARG 16

COPY_ONE_ARG 17

COPY_ONE_ARG 18

COPY_ONE_ARG 19

;

; Call the helper (too lazy to do the VMM structure stuff).

;

mov ecx, IMP(g_VM)

push ecx

call NAME(vmmRCProbeFireHelper)

.return:

leave

ret

ENDPROC VMMRCProbeFire