Boot Debugger Using的来源BlOsLoader函数中的BdInitDebugger和D:\srv03rtm\base\boot\loader

Boot Debugger Using的来源BlOsLoader函数中的BdInitDebugger和D:\srv03rtm\base\boot\loader_dbg.inc文件的关系----特别重要

ntldr改为ntldr_bak，然后ntldr_dbg改为ntldr

后可以调试NTLDR了！！！

第一部分：

第二部分：

D:\srv03rtm\base\boot>grep "Boot Debug" -nr D:\srv03rtm\base\boot
D:\srv03rtm\base\boot/bd/i386/port.c:58: TEXT("\nBoot Debugger Using: COM%d (Baud Rate %d)\n"),
D:\srv03rtm\base\boot/bd/ia64/miscc.c:11: This module contains utility functions used by IA-64 Boot Debugger.
D:\srv03rtm\base\boot/bd/ia64/port.c:60: TEXT("\r\nBoot Debugger Using: COM%d (Baud Rate %d)\r\n"),
D:\srv03rtm\base\boot/bd/init.c:156: DbgPrint("BD: Boot Debugger Initialized\n");

LOGICAL
BdPortInitialize(
IN ULONG BaudRate,
IN ULONG PortNumber,
OUT PULONG BdFileId
)

/*++

Routine Description:

This functions initializes the boot debugger com port.

Arguments:

BaudRate - Supplies an optional baud rate.

PortNumber - supplies an optinal port number.

Returned Value:

TRUE - If a debug port is found.

--*/

{
//
// Initialize the specified port.
//
if (!BlPortInitialize(BaudRate, PortNumber, NULL, FALSE, BdFileId)) {
return FALSE;
}
_stprintf(DebugMessage,
TEXT("\nBoot Debugger Using: COM%d (Baud Rate %d)\n"),
PortNumber,
BaudRate);

//
// We cannot use BlPrint() at this time because BlInitStdIo() has not been called, which is
// required to use the Arc emulator code.
//
TextStringOut(DebugMessage);
return TRUE;
}

D:\srv03rtm\base\boot>grep "BdPortInitialize" -nr D:\srv03rtm\base\boot
D:\srv03rtm\base\boot/bd/bd.h:161:BdPortInitialize(
D:\srv03rtm\base\boot/bd/i386/port.c:26:BdPortInitialize(
D:\srv03rtm\base\boot/bd/ia64/port.c:28:BdPortInitialize(
D:\srv03rtm\base\boot/bd/init.c:126: if (BdPortInitialize(BaudRate, PortNumber, &BdFileId) == FALSE) {

第三部分：

VOID
BdInitDebugger (
IN PCHAR LoaderName,
IN PVOID LoaderBase,
IN PCHAR Options
)

/*++

Routine Description:

This routine initializes the boot kernel debugger.

Arguments:

Options - Supplies a pointer to the the boot options.

Stop - Supplies a logical value that determines whether a debug message
and breakpoint are generated.

Return Value:

None.

--*/

{

//
// Attempt to initialize the debug port.
//
if (BdPortInitialize(BaudRate, PortNumber, &BdFileId)== FALSE) {
return;
}

第四部分：

D:\srv03rtm\base\boot>grep "BdInitDebugger" -nr D:\srv03rtm\base\boot
D:\srv03rtm\base\boot/bd/init.c:38:BdInitDebugger (
D:\srv03rtm\base\boot/bldr/i386/parsboot.c:579: // pass to BdInitDebugger to handle.
D:\srv03rtm\base\boot/bldr/i386/parsboot.c:592: BdInitDebugger((PCHAR)OsLoaderName, (PVOID)OsLoaderBase, pCurrent);
D:\srv03rtm\base\boot/bldr/osloader.c:1118: DBGTRACE( TEXT("About to BdInitDebugger. Base = %x\r\n"), LoaderBase );
D:\srv03rtm\base\boot/bldr/osloader.c:1120: BdInitDebugger((PCHAR)OsLoaderName, LoaderBase, ENABLE_LOADER_DEBUG);
D:\srv03rtm\base\boot/bldr/osloader.c:1122: DBGTRACE( TEXT("Back From BdInitDebugger.\r\n") );
D:\srv03rtm\base\boot/bldr/osloader.c:1126: BdInitDebugger((PCHAR)OsLoaderName, 0, NULL);
D:\srv03rtm\base\boot/inc/bldr.h:422:BdInitDebugger (
D:\srv03rtm\base\boot/lib/i386/memory.c:849: BdInitDebugger((PCHAR)OsLoaderName, (PVOID)OsLoaderBase, ENABLE_LOADER_DEBUG);
D:\srv03rtm\base\boot/lib/i386/memory.c:851: BdInitDebugger((PCHAR)OsLoaderName, (PVOID)OsLoaderBase, NULL);
D:\srv03rtm\base\boot/oschoice/oschoice.c:1254: BdInitDebugger("oschoice.exe", LoaderBase, ENABLE_LOADER_DEBUG);
D:\srv03rtm\base\boot/oschoice/oschoice.c:1258: BdInitDebugger("oschoice.exe", LoaderBase, NULL);
D:\srv03rtm\base\boot/setup/setup.c:565: BdInitDebugger((PCHAR)OsLoaderName, LoaderBase, ENABLE_LOADER_DEBUG);
D:\srv03rtm\base\boot/setup/setup.c:569: BdInitDebugger((PCHAR)OsLoaderName, 0, NULL);

ARC_STATUS
BlOsLoader (
IN ULONG Argc,
IN CHAR * FIRMWARE_PTR * FIRMWARE_PTR Argv,
IN CHAR * FIRMWARE_PTR * FIRMWARE_PTR Envp
)

/*++

Routine Description:

This is the main routine that controls the loading of the NT operating
system on an ARC compliant system. It opens the system partition,
the boot partition, the console input device, and the console output
device. The NT operating system and all its DLLs are loaded and bound
together. Control is then transfered to the loaded system.

Arguments:

Argc - Supplies the number of arguments that were provided on the
command that invoked this program.

Argv - Supplies a pointer to a vector of pointers to null terminated
argument strings.

Envp - Supplies a pointer to a vector of pointers to null terminated
environment variables.

Return Value:

EBADF is returned if the specified OS image cannot be loaded.

--*/

{

。。。

//
// Initialize the OS loader console input and output.
//
Status = BlInitStdio(Argc, Argv);
if (Status != ESUCCESS) {
return Status;
}

//
// Initialize the boot debugger for platforms that directly load the
// OS Loader.
//
// N.B. This must occur after the console input and output have been
// initialized so debug messages can be printed on the console
// output device.
//

#if defined(_ALPHA_) || defined(ARCI386) || defined(_IA64_)
//
// Locate the memory descriptor for the OS Loader.
//

ProgramDescriptor = NULL;
while ((ProgramDescriptor = ArcGetMemoryDescriptor(ProgramDescriptor)) != NULL) {
if (ProgramDescriptor->MemoryType == MemoryLoadedProgram) {
break;
}
}

//
// If the program memory descriptor was found, then compute the base
// address of the OS Loader for use by the debugger.
//

LoaderBase = &__ImageBase;

//
// Initialize traps and the boot debugger.
//
#if defined(ENABLE_LOADER_DEBUG)

#if defined(_ALPHA_)
BdInitializeTraps();
#endif

DBGTRACE( TEXT("About to BdInitDebugger. Base = %x\r\n"), LoaderBase );

BdInitDebugger((PCHAR)OsLoaderName, LoaderBase, ENABLE_LOADER_DEBUG);

DBGTRACE( TEXT("Back From BdInitDebugger.\r\n") );

#else

BdInitDebugger((PCHAR)OsLoaderName, 0, NULL);

#endif

第五部分：D:\srv03rtm\base\boot\loader_dbg.inc文件内容：

#
# set the flags necessary to build debug enabled boot loaders
#