mirror of
https://github.com/reactos/reactos.git
synced 2024-11-02 12:53:33 +00:00
126 lines
1.8 KiB
C
126 lines
1.8 KiB
C
#include <ddk/ntddk.h>
|
|
|
|
|
|
void MmSafeCopyToUserRestart();
|
|
void MmSafeCopyToUserUnsafeStart();
|
|
void MmSafeCopyFromUserUnsafeStart();
|
|
void MmSafeCopyFromUserRestart();
|
|
|
|
/*
|
|
* NTSTATUS MmSafeCopyFromUser(PVOID Dest, PVOID Src,
|
|
* ULONG NumberOfBytes)
|
|
*/
|
|
__declspec(naked)
|
|
NTSTATUS MmSafeCopyFromUser(PVOID Dest, const VOID *Src, ULONG Count)
|
|
{
|
|
__asm
|
|
{
|
|
push ebp
|
|
mov ebp,esp
|
|
|
|
push esi
|
|
push edi
|
|
push ecx
|
|
|
|
mov edi, 8[ebp]
|
|
mov esi, 12[ebp]
|
|
mov ecx, 16[ebp]
|
|
|
|
/*
|
|
* Default return code
|
|
*/
|
|
xor eax,eax
|
|
|
|
jmp MmSafeCopyFromUserUnsafeStart
|
|
}
|
|
}
|
|
|
|
|
|
__declspec(naked)
|
|
void MmSafeCopyFromUserUnsafeStart()
|
|
{
|
|
__asm
|
|
{
|
|
/*
|
|
* This is really a synthetic instruction since if we incur a
|
|
* pagefault then eax will be set to an appropiate STATUS code
|
|
*/
|
|
cld
|
|
rep movsb
|
|
|
|
jmp MmSafeCopyFromUserRestart
|
|
}
|
|
}
|
|
|
|
__declspec(naked)
|
|
void MmSafeCopyFromUserRestart()
|
|
{
|
|
__asm
|
|
{
|
|
pop ecx
|
|
pop edi
|
|
pop esi
|
|
|
|
pop ebp
|
|
ret
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*
|
|
* NTSTATUS MmSafeCopyToUser(PVOID Dest, PVOID Src,
|
|
* ULONG NumberOfBytes)
|
|
*/
|
|
NTSTATUS MmSafeCopyToUser(PVOID Dest, const VOID *Src, ULONG Count)
|
|
{
|
|
__asm
|
|
{
|
|
push ebp
|
|
mov esp,ebp
|
|
|
|
push esi
|
|
push edi
|
|
push ecx
|
|
|
|
mov edi, 8[ebp]
|
|
mov esi, 12[ebp]
|
|
mov ecx, 16[ebp]
|
|
|
|
/*
|
|
* Default return code
|
|
*/
|
|
xor eax,eax
|
|
|
|
jmp MmSafeCopyToUserUnsafeStart
|
|
}
|
|
}
|
|
|
|
__declspec(naked)
|
|
void MmSafeCopyToUserUnsafeStart()
|
|
{
|
|
__asm
|
|
{
|
|
/*
|
|
* This is really a synthetic instruction since if we incur a
|
|
* pagefault then eax will be set to an appropiate STATUS code
|
|
*/
|
|
cld
|
|
rep movsb
|
|
jmp MmSafeCopyToUserRestart
|
|
}
|
|
}
|
|
|
|
__declspec(naked)
|
|
void MmSafeCopyToUserRestart()
|
|
{
|
|
__asm
|
|
{
|
|
pop ecx
|
|
pop edi
|
|
pop esi
|
|
|
|
pop ebp
|
|
ret
|
|
}
|
|
} |