startup.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/* $Id: startup.c 24017 2006-09-10 08:35:30Z fireball $
 *
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         ReactOS kernel
 * FILE:            lib/ntdll/ldr/startup.c
 * PURPOSE:         Process startup for PE executables
 * PROGRAMMERS:     Jean Michault
 *                  Rex Jolliff ([e-mail])
 */

/* INCLUDES *****************************************************************/

#include <ntdll.h>
#define NDEBUG
#include <debug.h>
#include <win32k/callback.h>

VOID RtlInitializeHeapManager (VOID);
VOID LdrpInitLoader(VOID);
VOID NTAPI RtlpInitDeferedCriticalSection(VOID);

/* GLOBALS *******************************************************************/


extern unsigned int _image_base__;

static RTL_CRITICAL_SECTION PebLock;
static RTL_CRITICAL_SECTION LoaderLock;
static RTL_BITMAP TlsBitMap;
PLDR_DATA_TABLE_ENTRY ExeModule;

NTSTATUS LdrpAttachThread (VOID);

VOID RtlpInitializeVectoredExceptionHandling(VOID);


#define VALUE_BUFFER_SIZE 256

BOOLEAN FASTCALL
ReadCompatibilitySetting(HANDLE Key, LPWSTR Value, PKEY_VALUE_PARTIAL_INFORMATION ValueInfo, DWORD *Buffer)
{
	UNICODE_STRING ValueName;
	NTSTATUS Status;
	ULONG Length;

	RtlInitUnicodeString(&ValueName, Value);
	Status = NtQueryValueKey(Key,
		&ValueName,
		KeyValuePartialInformation,
		ValueInfo,
		VALUE_BUFFER_SIZE,
		&Length);

	if (!NT_SUCCESS(Status) || (ValueInfo->Type != REG_DWORD))
	{
		RtlFreeUnicodeString(&ValueName);
		return FALSE;
	}
	RtlCopyMemory(Buffer, &ValueInfo->Data[0], sizeof(DWORD));
	RtlFreeUnicodeString(&ValueName);
	return TRUE;
}

VOID FASTCALL
LoadImageFileExecutionOptions(PPEB Peb)
{
    NTSTATUS Status = STATUS_SUCCESS;
    ULONG Value = 0;
    UNICODE_STRING ValueString;
    UNICODE_STRING ImageName;
    UNICODE_STRING ImagePathName;
    WCHAR ValueBuffer[64];
    ULONG ValueSize;

    if (Peb->ProcessParameters &&
        Peb->ProcessParameters->ImagePathName.Length > 0)
      {
        DPRINT("%wZ\n", &Peb->ProcessParameters->ImagePathName);

        ImagePathName = Peb->ProcessParameters->ImagePathName;
        ImageName.Buffer = ImagePathName.Buffer + ImagePathName.Length / sizeof(WCHAR);
        ImageName.Length = 0;
        while (ImagePathName.Buffer < ImageName.Buffer)
        {
            ImageName.Buffer--;
            if (*ImageName.Buffer == L'\\')
            {
               ImageName.Buffer++;
               break;
            }
        }
        ImageName.Length = ImagePathName.Length - (ImageName.Buffer - ImagePathName.Buffer) * sizeof(WCHAR);
        ImageName.MaximumLength = ImageName.Length + ImagePathName.MaximumLength - ImagePathName.Length;

        DPRINT("%wZ\n", &ImageName);

        /* global flag */
        Status = LdrQueryImageFileExecutionOptions (&ImageName,
				                    L"GlobalFlag",
				                    REG_SZ,
						    (PVOID)ValueBuffer,
						    sizeof(ValueBuffer),
						    &ValueSize);
        if (NT_SUCCESS(Status))
          {
            ValueString.Buffer = ValueBuffer;
	    ValueString.Length = ValueSize - sizeof(WCHAR);
	    ValueString.MaximumLength = sizeof(ValueBuffer);
	    Status = RtlUnicodeStringToInteger(&ValueString, 16, &Value);
            if (NT_SUCCESS(Status))
              {
                Peb->NtGlobalFlag |= Value;
	        DPRINT("GlobalFlag: Key='%S', Value=0x%lx\n", ValueBuffer, Value);
              }
	  }
        /*
	 * FIXME:
	 *   read more options
         */
      }
}




BOOLEAN FASTCALL
LoadCompatibilitySettings(PPEB Peb)
{
	NTSTATUS Status;
	HANDLE UserKey = NULL;
	HANDLE KeyHandle;
	HANDLE SubKeyHandle;
	OBJECT_ATTRIBUTES ObjectAttributes;
	UNICODE_STRING KeyName = RTL_CONSTANT_STRING(
    L"Software\\Microsoft\\Windows NT\\CurrentVersion\\AppCompatFlags\\Layers");
	UNICODE_STRING ValueName;
	UCHAR ValueBuffer[VALUE_BUFFER_SIZE];
	PKEY_VALUE_PARTIAL_INFORMATION ValueInfo;
	ULONG Length;
	DWORD MajorVersion, MinorVersion, BuildNumber, PlatformId,
		  SPMajorVersion, SPMinorVersion= 0;

	if(Peb->ProcessParameters &&
		(Peb->ProcessParameters->ImagePathName.Length > 0))
	{
		Status = RtlOpenCurrentUser(KEY_READ,
				    &UserKey);
		if (!NT_SUCCESS(Status))
		{
			return FALSE;
		}

		InitializeObjectAttributes(&ObjectAttributes,
			&KeyName,
			OBJ_CASE_INSENSITIVE,
			UserKey,
			NULL);

		Status = NtOpenKey(&KeyHandle,
					KEY_QUERY_VALUE,
					&ObjectAttributes);

		if (!NT_SUCCESS(Status))
		{
			if (UserKey) NtClose(UserKey);
			return FALSE;
		}

		/* query version name for application */
		ValueInfo = (PKEY_VALUE_PARTIAL_INFORMATION)ValueBuffer;
		Status = NtQueryValueKey(KeyHandle,
			&Peb->ProcessParameters->ImagePathName,
			KeyValuePartialInformation,
			ValueBuffer,
			VALUE_BUFFER_SIZE,
			&Length);

		if (!NT_SUCCESS(Status) || (ValueInfo->Type != REG_SZ))
		{
			NtClose(KeyHandle);
			if (UserKey) NtClose(UserKey);
			return FALSE;
		}

		ValueName.Length = ValueInfo->DataLength;
		ValueName.MaximumLength = ValueInfo->DataLength;
		ValueName.Buffer = (PWSTR)ValueInfo->Data;

		/* load version info */
		InitializeObjectAttributes(&ObjectAttributes,
			&ValueName,
			OBJ_CASE_INSENSITIVE,
			KeyHandle,
			NULL);

		Status = NtOpenKey(&SubKeyHandle,
					KEY_QUERY_VALUE,
					&ObjectAttributes);

		if (!NT_SUCCESS(Status))
		{
			NtClose(KeyHandle);
			if (UserKey) NtClose(UserKey);
			return FALSE;
		}

		DPRINT("Loading version information for: %wZ\n", &ValueName);

		/* read settings from registry */
		if(!ReadCompatibilitySetting(SubKeyHandle, L"MajorVersion", ValueInfo, &MajorVersion))
			goto finish;
		if(!ReadCompatibilitySetting(SubKeyHandle, L"MinorVersion", ValueInfo, &MinorVersion))
			goto finish;
		if(!ReadCompatibilitySetting(SubKeyHandle, L"BuildNumber", ValueInfo, &BuildNumber))
			goto finish;
		if(!ReadCompatibilitySetting(SubKeyHandle, L"PlatformId", ValueInfo, &PlatformId))
			goto finish;

		/* now assign the settings */
		Peb->OSMajorVersion = (ULONG)MajorVersion;
		Peb->OSMinorVersion = (ULONG)MinorVersion;
		Peb->OSBuildNumber = (USHORT)BuildNumber;
		Peb->OSPlatformId = (ULONG)PlatformId;

		/* optional service pack version numbers */
		if(ReadCompatibilitySetting(SubKeyHandle, L"SPMajorVersion", ValueInfo, &SPMajorVersion) &&
		   ReadCompatibilitySetting(SubKeyHandle, L"SPMinorVersion", ValueInfo, &SPMinorVersion))
			Peb->OSCSDVersion = ((SPMajorVersion & 0xFF) << 8) | (SPMinorVersion & 0xFF);

finish:
		/* we're finished */
		NtClose(SubKeyHandle);
		NtClose(KeyHandle);
		if (UserKey) NtClose(UserKey);
		return TRUE;
	}
	return FALSE;
}

/* FUNCTIONS *****************************************************************/

VOID
NTAPI
LdrpInit(PCONTEXT Context,
         PVOID SystemArgument1,
         PVOID SystemArgument2)
{
   PIMAGE_NT_HEADERS NTHeaders;