w32knapi.c File Reference

#include "w32knapi.h"

Include dependency graph for w32knapi.c:

Go to the source code of this file.

Functions
static PGDI_TABLE_ENTRY	MyGdiQueryTable ()
BOOL	IsHandleValid (HGDIOBJ hobj)
PVOID	GetHandleUserData (HGDIOBJ hobj)
static DWORD WINAPI	IntSyscall (FARPROC proc, UINT cParams, PVOID pFirstParam)
DWORD	Syscall (LPWSTR pszFunction, int cParams, void *pParams)
BOOL	IsFunctionPresent (LPWSTR lpszFunction)
int APIENTRY	WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

Variables
HINSTANCE	g_hInstance
HMODULE	g_hModule = NULL
PGDI_TABLE_ENTRY	GdiHandleTable

Function Documentation

GetHandleUserData()

PVOID GetHandleUserData

(

HGDIOBJ

hobj

)

Definition at line 33 of file w32knapi.c.

{
    USHORT Index = (ULONG_PTR)hobj;
    PGDI_TABLE_ENTRY pentry = &GdiHandleTable[Index];
 
    if (pentry->KernelData == NULL ||
        pentry->KernelData < (PVOID)0x80000000 ||
        (USHORT)pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16))
    {
        return NULL;
    }
 
    return pentry->UserData;
}

IntSyscall()

static DWORD WINAPI IntSyscall ( FARPROC  proc, UINT  cParams, PVOID  pFirstParam  )

static

Definition at line 50 of file w32knapi.c.

{
    DWORD retval;
 
#ifdef __GNUC__
    asm volatile
    (
        "pushfl;"               // Save flags
        "movl %%ecx, %%eax;"
        "shl $2, %%eax;"        // Calculate param size
        "subl %%eax, %%esp;"    // Calculate new stack pos
        "movl %%esp, %%edi;"    // Destination is stackpointer
        "cld;"                  // Clear direction flag
        "rep movsd;"            // Copy params to the stack
        "call *%%edx;"          // Call function
        "popfl;"                // Restore flags
        : "=a" (retval)
        : "S" (pFirstParam), "c" (cParams), "d"(proc)
        : "%edi"
    );
#else
    __asm
    {
        pushf
        mov eax, cParams
        shl eax, 2
        sub esp, eax
        mov edi, esp
        cld
        rep movsd
        call proc
        mov retval, eax
        popf
    };
#endif
 
    return retval;
}

Referenced by Syscall().

IsFunctionPresent()

BOOL IsFunctionPresent

(

LPWSTR

lpszFunction

)

Definition at line 107 of file w32knapi.c.

{
    char szFunctionName[MAX_PATH];
    sprintf(szFunctionName, "%ls", lpszFunction);
    return (GetProcAddress(g_hModule, szFunctionName) != NULL);
}

IsHandleValid()

BOOL IsHandleValid

(

HGDIOBJ

hobj

)

Definition at line 17 of file w32knapi.c.

{
    USHORT Index = (ULONG_PTR)hobj;
    PGDI_TABLE_ENTRY pentry = &GdiHandleTable[Index];
 
    if (pentry->KernelData == NULL ||
        pentry->KernelData < (PVOID)0x80000000 ||
        (USHORT)pentry->FullUnique != (USHORT)((ULONG_PTR)hobj >> 16))
    {
        return FALSE;
    }
 
    return TRUE;
}

MyGdiQueryTable()

static PGDI_TABLE_ENTRY MyGdiQueryTable ( )

static

Definition at line 9 of file w32knapi.c.

{
    PTEB pTeb = NtCurrentTeb();
    PPEB pPeb = pTeb->ProcessEnvironmentBlock;
    return pPeb->GdiSharedHandleTable;
}

Referenced by WinMain().

Syscall()

DWORD Syscall	(	LPWSTR	pszFunction,
		int	cParams,
		void *	pParams
	)

Definition at line 90 of file w32knapi.c.

{
    char szFunctionName[MAX_PATH];
    FARPROC proc;
 
    sprintf(szFunctionName, "%ls", pszFunction);
    proc = (FARPROC)GetProcAddress(g_hModule, szFunctionName);
    if (!proc)
    {
        printf("Couldn't find proc: %s\n", szFunctionName);
        return FALSE;
    }
 
    return IntSyscall(proc, cParams, pParams);
}

Referenced by NtUserEnumDisplayMonitors1().

WinMain()

int APIENTRY WinMain	(	HINSTANCE	hInstance,
		HINSTANCE	hPrevInstance,
		LPSTR	lpCmdLine,
		int	nCmdShow
	)

Definition at line 115 of file w32knapi.c.

{
    g_hInstance = hInstance;
 
    printf("Win32k native API test\n");
 
    /* Convert to gui thread */
    // IsGUIThread(TRUE); <- does not exists on win2k
 
    InitOsVersion();
    printf("g_OsIdx = %d\n", g_OsIdx);
 
    g_hModule = LoadLibraryW(L"win32u.dll");
    if (!g_hModule)
    {
        printf("win32u.dll not found!\n");
        return -1;
    }
 
    GdiHandleTable = MyGdiQueryTable();
    if(!GdiHandleTable)
    {
        FreeLibrary(g_hModule);
        printf("GdiHandleTable not found!\n");
        return -1;
    }
 
    printf("\n");
 
    return TestMain(L"w32knapi", L"win32k.sys Nt-Api");
}

Variable Documentation

g_hInstance

HINSTANCE g_hInstance

Definition at line 3 of file w32knapi.c.

Referenced by WinMain().

g_hModule

HMODULE g_hModule = NULL

Definition at line 4 of file w32knapi.c.

Referenced by IsFunctionPresent(), Syscall(), and WinMain().

GdiHandleTable

PGDI_TABLE_ENTRY GdiHandleTable

Definition at line 5 of file w32knapi.c.

Referenced by GetHandleUserData(), IsHandleValid(), and WinMain().