/*++

Copyright (c) 1993  Microsoft Corporation

Module Name:

    kdexts.c

Abstract:

    This file contains the generic routines and initialization code
    for the kernel debugger extensions dll.

--*/

extern "C"
void
_disable (
    void
    );

extern "C"
void
_enable (
    void
    );

#include "precomp.h"
#pragma hdrstop

#include <ntverp.h>

//
// globals
//
WINDBG_EXTENSION_APIS   ExtensionApis;
ULONG64                 STeip;
ULONG64                 STebp;
ULONG64                 STesp;

DBGKD_GET_VERSION64     KernelVersionPacket;
KDDEBUGGER_DATA64       KdDebuggerData;

ULONG64 EXPRLastDump = 0;

//
// Valid for the lifetime of the debug session.
//

ULONG   PageSize;
ULONG64 PaeEnabled;
ULONG   TargetMachine;
BOOL    Connected;

//
// this string is for supporting both the old and the new way of getting
// data from the kernel.  Maybe it will go away soon.
//
char ___SillyString[200];

PDEBUG_ADVANCED       g_ExtAdvanced;
PDEBUG_CLIENT         g_ExtClient;
PDEBUG_CONTROL        g_ExtControl;
PDEBUG_DATA_SPACES    g_ExtData;
PDEBUG_REGISTERS      g_ExtRegisters;
PDEBUG_SYMBOLS        g_ExtSymbols;
PDEBUG_SYSTEM_OBJECTS g_ExtSystem;

// Queries for all debugger interfaces.
extern "C" HRESULT
ExtQuery(PDEBUG_CLIENT Client)
{
    HRESULT Status;
    
    if ((Status = Client->QueryInterface(__uuidof(IDebugAdvanced),
                                 (void **)&g_ExtAdvanced)) != S_OK)
    {
        goto Fail;
    }
    if ((Status = Client->QueryInterface(__uuidof(IDebugControl),
                                 (void **)&g_ExtControl)) != S_OK)
    {
        goto Fail;
    }
    if ((Status = Client->QueryInterface(__uuidof(IDebugDataSpaces),
                                 (void **)&g_ExtData)) != S_OK)
    {
        goto Fail;
    }
    if ((Status = Client->QueryInterface(__uuidof(IDebugRegisters),
                                 (void **)&g_ExtRegisters)) != S_OK)
    {
        goto Fail;
    }
    if ((Status = Client->QueryInterface(__uuidof(IDebugSymbols),
                                 (void **)&g_ExtSymbols)) != S_OK)
    {
        goto Fail;
    }
    if ((Status = Client->QueryInterface(__uuidof(IDebugSystemObjects),
                                         (void **)&g_ExtSystem)) != S_OK)
    {
        goto Fail;
    }

    g_ExtClient = Client;
    
    return S_OK;

 Fail:
    ExtRelease();
    return Status;
}

// Cleans up all debugger interfaces.
void
ExtRelease(void)
{
    g_ExtClient = NULL;
    EXT_RELEASE(g_ExtAdvanced);
    EXT_RELEASE(g_ExtControl);
    EXT_RELEASE(g_ExtData);
    EXT_RELEASE(g_ExtRegisters);
    EXT_RELEASE(g_ExtSymbols);
    EXT_RELEASE(g_ExtSystem);
}

// Normal output.
void __cdecl
ExtOut(PCSTR Format, ...)
{
    va_list Args;
    
    va_start(Args, Format);
    g_ExtControl->OutputVaList(DEBUG_OUTPUT_NORMAL, Format, Args);
    va_end(Args);
}

// Error output.
void __cdecl
ExtErr(PCSTR Format, ...)
{
    va_list Args;
    
    va_start(Args, Format);
    g_ExtControl->OutputVaList(DEBUG_OUTPUT_ERROR, Format, Args);
    va_end(Args);
}

// Warning output.
void __cdecl
ExtWarn(PCSTR Format, ...)
{
    va_list Args;
    
    va_start(Args, Format);
    g_ExtControl->OutputVaList(DEBUG_OUTPUT_WARNING, Format, Args);
    va_end(Args);
}

// Verbose output.
void __cdecl
ExtVerb(PCSTR Format, ...)
{
    va_list Args;
    
    va_start(Args, Format);
    g_ExtControl->OutputVaList(DEBUG_OUTPUT_VERBOSE, Format, Args);
    va_end(Args);
}


extern "C"
HRESULT
CALLBACK
DebugExtensionInitialize(PULONG Version, PULONG Flags)
{
    IDebugClient *DebugClient;
    PDEBUG_CONTROL DebugControl;
    HRESULT Hr;

    *Version = DEBUG_EXTENSION_VERSION(1, 0);
    *Flags = 0;
    

    if ((Hr = DebugCreate(__uuidof(IDebugClient),
                          (void **)&DebugClient)) != S_OK)
    {
        return Hr;
    }
    if ((Hr = DebugClient->QueryInterface(__uuidof(IDebugControl),
                                              (void **)&DebugControl)) != S_OK)
    {
        return Hr;
    }

    ExtensionApis.nSize = sizeof (ExtensionApis);
    if ((Hr = DebugControl->GetWindbgExtensionApis64(&ExtensionApis)) != S_OK) {
        return Hr;
    }

    DebugControl->Release();
    DebugClient->Release();
    return S_OK;
}


extern "C"
void
CALLBACK
DebugExtensionNotify(ULONG Notify, ULONG64 Argument)
{
    //
    // The first time we actually connect to a target, get the page size
    //

    if ((Notify == DEBUG_NOTIFY_SESSION_ACCESSIBLE) && (!Connected))
    {
        IDebugClient *DebugClient;
        PDEBUG_DATA_SPACES DebugDataSpaces;
        PDEBUG_CONTROL DebugControl;
        HRESULT Hr;
        ULONG64 Page;

        if ((Hr = DebugCreate(__uuidof(IDebugClient),
                              (void **)&DebugClient)) == S_OK)
        {
            //
            // Get the page size and PAE enable flag
            //

            if ((Hr = DebugClient->QueryInterface(__uuidof(IDebugDataSpaces),
                                       (void **)&DebugDataSpaces)) == S_OK)
            {
                if ((Hr = DebugDataSpaces->ReadDebuggerData(
                                            DEBUG_DATA_PaeEnabled, &PaeEnabled,
                                            sizeof(PaeEnabled), NULL)) == S_OK)
                {
                    if ((Hr = DebugDataSpaces->ReadDebuggerData(
                                                DEBUG_DATA_MmPageSize, &Page,
                                                sizeof(Page), NULL)) == S_OK)
                    {
                        PageSize = (ULONG)(ULONG_PTR)Page;
                    }
                }

                DebugDataSpaces->Release();
            }

            //
            // Get the architecture type.
            //

            if (PageSize)
            {
                if ((Hr = DebugClient->QueryInterface(__uuidof(IDebugControl),
                                           (void **)&DebugControl)) == S_OK)
                {
                    if ((Hr = DebugControl->GetActualProcessorType(
                                                 &TargetMachine)) == S_OK)
                    {
                        Connected = TRUE;
                    }

                    DebugControl->Release();
                }
            }

            DebugClient->Release();
        }
    }


    if (Notify == DEBUG_NOTIFY_SESSION_INACTIVE)
    {
        Connected = FALSE;
        PageSize = 0;
        PaeEnabled = 0;
        TargetMachine = 0;
    }

    return;
}

extern "C"
void
CALLBACK
DebugExtensionUninitialize(void)
{
    return;
}

BOOL
HaveDebuggerData(
    VOID
    )
{
    static int havedata = 0;

    if (havedata == 0) {
        if (!Ioctl( IG_GET_KERNEL_VERSION, &KernelVersionPacket, sizeof(KernelVersionPacket))) {
            havedata = 2;
        } else if (KernelVersionPacket.MajorVersion == 0) {
            havedata = 2;
        } else {
            havedata = 1;
        }
    }

    return (havedata == 1) &&
           ((KernelVersionPacket.Flags & DBGKD_VERS_FLAG_DATA) != 0);
}

BOOL
GetCurrentProcessor(
    IN PDEBUG_CLIENT Client,
    OPTIONAL OUT PULONG pProcessor,
    OPTIONAL OUT PHANDLE phCurrentThread
    )
{
    PDEBUG_SYSTEM_OBJECTS DebugSystem;
    ULONG64 hCurrentThread;

    if (Client) {
        if (Client->QueryInterface(__uuidof(IDebugSystemObjects),
                                   (void **)&DebugSystem) != S_OK) {
            return 0;
        }

        DebugSystem->GetCurrentThreadHandle(&hCurrentThread);
        if (phCurrentThread) { 
            *phCurrentThread = (HANDLE) hCurrentThread;
        }
        if (pProcessor) {
            *pProcessor = (ULONG) hCurrentThread - 1;
        }

        DebugSystem->Release();
        return TRUE;
    }
    return FALSE;

    
}