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|
; $Id: MMRamRCA.asm $
;; @file
; MMRamGCA - Guest Context Ram access Assembly Routines.
;
;
; Copyright (C) 2006-2019 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 "VBox/err.mac"
%include "iprt/err.mac"
%include "iprt/x86.mac"
BEGINCODE
;;
; Read data in guest context, CDECL calling conv.
; VMMRCDECL(int) MMGCRamRead(void *pDst, void *pSrc, size_t cb);
; MMRamGC page fault handler must be installed prior this call for safe operation.
;
; @returns eax=0 if data read, other code - invalid access, #PF was generated.
; @param [esp + 04h] Param 1 - Pointer where to store result data (pDst).
; @param [esp + 08h] Param 2 - Pointer of data to read (pSrc).
; @param [esp + 0ch] Param 3 - Size of data to read, only 1/2/4/8 is valid.
; @uses eax, ecx, edx
;
; @remark Data is saved to destination (Param 1) even if read error occurred!
;
align 16
BEGINPROC MMGCRamReadNoTrapHandler
mov eax, [esp + 0ch] ; eax = size of data to read
cmp eax, byte 8 ; yes, it's slow, validate input
ja ramread_InvalidSize
mov edx, [esp + 04h] ; edx = result address
mov ecx, [esp + 08h] ; ecx = data address
jmp [ramread_table + eax*4]
ramread_byte:
xor eax, eax ; rc = VINF_SUCCESS by default
mov cl, [ecx] ; read data
mov [edx], cl ; save data
ret
ramread_word:
xor eax, eax ; rc = VINF_SUCCESS by default
mov cx, [ecx] ; read data
mov [edx], cx ; save data
ret
ramread_dword:
xor eax, eax ; rc = VINF_SUCCESS by default
mov ecx, [ecx] ; read data
mov [edx], ecx ; save data
ret
ramread_qword:
mov eax, [ecx] ; read data
mov [edx], eax ; save data
mov eax, [ecx+4] ; read data
mov [edx+4], eax ; save data
xor eax, eax ; rc = VINF_SUCCESS by default
ret
; Read error - we will be here after our page fault handler.
GLOBALNAME MMGCRamRead_Error
mov eax, VERR_ACCESS_DENIED
ret
; Invalid data size
ramread_InvalidSize:
mov eax, VERR_INVALID_PARAMETER
ret
; Jump table
ramread_table:
DD ramread_InvalidSize
DD ramread_byte
DD ramread_word
DD ramread_InvalidSize
DD ramread_dword
DD ramread_InvalidSize
DD ramread_InvalidSize
DD ramread_InvalidSize
DD ramread_qword
ENDPROC MMGCRamReadNoTrapHandler
;;
; Write data in guest context, CDECL calling conv.
; VMMRCDECL(int) MMGCRamWrite(void *pDst, void *pSrc, size_t cb);
;
; @returns eax=0 if data written, other code - invalid access, #PF was generated.
; @param [esp + 04h] Param 1 - Pointer where to write data (pDst).
; @param [esp + 08h] Param 2 - Pointer of data to write (pSrc).
; @param [esp + 0ch] Param 3 - Size of data to write, only 1/2/4 is valid.
; @uses eax, ecx, edx
;
align 16
BEGINPROC MMGCRamWriteNoTrapHandler
mov eax, [esp + 0ch] ; eax = size of data to write
cmp eax, byte 4 ; yes, it's slow, validate input
ja ramwrite_InvalidSize
mov edx, [esp + 04h] ; edx = write address
mov ecx, [esp + 08h] ; ecx = data address
jmp [ramwrite_table + eax*4]
ramwrite_byte:
xor eax, eax ; rc = VINF_SUCCESS by default
mov cl, [ecx] ; read data
mov [edx], cl ; write data
ret
ramwrite_word:
xor eax, eax ; rc = VINF_SUCCESS by default
mov cx, [ecx] ; read data
mov [edx], cx ; write data
ret
ramwrite_dword:
xor eax, eax ; rc = VINF_SUCCESS by default
mov ecx, [ecx] ; read data
mov [edx], ecx ; write data
ret
; Write error - we will be here after our page fault handler.
GLOBALNAME MMGCRamWrite_Error
mov eax, VERR_ACCESS_DENIED
ret
; Invalid data size
ramwrite_InvalidSize:
mov eax, VERR_INVALID_PARAMETER
ret
; Jump table
ramwrite_table:
DD ramwrite_InvalidSize
DD ramwrite_byte
DD ramwrite_word
DD ramwrite_InvalidSize
DD ramwrite_dword
ENDPROC MMGCRamWriteNoTrapHandler
|
