{ $Id$ }
{
 ---------------------------------------------------------------------------
 fpdbgwinextra.pp  -  Native Freepascal debugger - Extra windows utilities
 ---------------------------------------------------------------------------

 This unit contains utility functions and missing win32/64 API

 ---------------------------------------------------------------------------

 @created(Mon Apr 10th WET 2006)
 @lastmod($Date$)
 @author(Marc Weustink <marc@@dommelstein.nl>)

 ***************************************************************************
 *                                                                         *
 *   This source is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This code is distributed in the hope that it will be useful, but      *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   General Public License for more details.                              *
 *                                                                         *
 *   A copy of the GNU General Public License is available on the World    *
 *   Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also      *
 *   obtain it by writing to the Free Software Foundation,                 *
 *   Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.   *
 *                                                                         *
 ***************************************************************************
}
unit FpDbgWinExtra;

{$mode objfpc}{$H+}

interface

{$ifdef windows}
uses
  Windows;
{$endif}

const
  FACILITY_DEBUGGER                                  = $001;
  FACILITY_RPC_RUNTIME                               = $002;
  FACILITY_RPC_STUBS                                 = $003;
  FACILITY_IO_ERROR_CODE                             = $004;
  FACILITY_TERMINAL_SERVER                           = $00A;
  FACILITY_USB_ERROR_CODE                            = $010;
  FACILITY_HID_ERROR_CODE                            = $011;
  FACILITY_FIREWIRE_ERROR_CODE                       = $012;
  FACILITY_CLUSTER_ERROR_CODE                        = $013;
  FACILITY_ACPI_ERROR_CODE                           = $014;
  FACILITY_SXS_ERROR_CODE                            = $015;

  STATUS_SEVERITY_SUCCESS                            = $0;
  STATUS_SEVERITY_INFORMATIONAL                      = $1;
  STATUS_SEVERITY_WARNING                            = $2;
  STATUS_SEVERITY_ERROR                              = $3;

function GetLastErrorText(AErrorCode: Cardinal): String; {$IFNDEF FPC} overload; {$ENDIF}
function GetLastErrorText: String; {$IFNDEF FPC} overload; {$ENDIF}

{$ifdef windows}
var
  MDebugEvent: TDebugEvent;
{$endif}

//function OpenThread(dwDesiredAccess: DWORD; bInheritHandle: BOOL; dwThreadId: DWORD): THandle; stdcall;
//function Wow64GetThreadContext(hThread: THandle; var lpContext: TContext): BOOL; stdcall;

const
  WOW64_MAXIMUM_SUPPORTED_EXTENSION = 512;
  WOW64_CONTEXT_i386 = $10000;
  WOW64_CONTEXT_i486 = $10000;
  WOW64_CONTEXT_CONTROL = WOW64_CONTEXT_i386 or 1;
  WOW64_CONTEXT_INTEGER = WOW64_CONTEXT_i386 or 2;              // AX, BX, CX, DX, SI, DI
  WOW64_CONTEXT_SEGMENTS = WOW64_CONTEXT_i386 or 4;             // DS, ES, FS, GS
  WOW64_CONTEXT_FLOATING_POINT = WOW64_CONTEXT_i386 or 8;       // 387 state
  WOW64_CONTEXT_DEBUG_REGISTERS = WOW64_CONTEXT_i386 or $10;    // DB 0-3,6,7
  WOW64_CONTEXT_EXTENDED_REGISTERS = WOW64_CONTEXT_i386 or $20; // cpu specific extensions
  WOW64_CONTEXT_FULL = (WOW64_CONTEXT_CONTROL or WOW64_CONTEXT_INTEGER) or WOW64_CONTEXT_SEGMENTS;
  WOW64_CONTEXT_ALL = WOW64_CONTEXT_FULL or WOW64_CONTEXT_FLOATING_POINT or WOW64_CONTEXT_DEBUG_REGISTERS or WOW64_CONTEXT_EXTENDED_REGISTERS;

  STATUS_WX86_SINGLE_STEP = $4000001E;
  STATUS_WX86_BREAKPOINT  = $4000001F;

type
   WOW64_FLOATING_SAVE_AREA = record
        ControlWord : DWORD;
        StatusWord : DWORD;
        TagWord : DWORD;
        ErrorOffset : DWORD;
        ErrorSelector : DWORD;
        DataOffset : DWORD;
        DataSelector : DWORD;
        RegisterArea : array[0..79] of BYTE;
        Cr0NpxState : DWORD;
     end;

   WOW64_CONTEXT = record
        ContextFlags : DWORD;
        Dr0 : DWORD;
        Dr1 : DWORD;
        Dr2 : DWORD;
        Dr3 : DWORD;
        Dr6 : DWORD;
        Dr7 : DWORD;
        FloatSave : WOW64_FLOATING_SAVE_AREA;
        SegGs : DWORD;
        SegFs : DWORD;
        SegEs : DWORD;
        SegDs : DWORD;
        Edi : DWORD;
        Esi : DWORD;
        Ebx : DWORD;
        Edx : DWORD;
        Ecx : DWORD;
        Eax : DWORD;
        Ebp : DWORD;
        Eip : DWORD;
        SegCs : DWORD;
        EFlags : DWORD;
        Esp : DWORD;
        SegSs : DWORD;
        ExtendedRegisters: array [1..WOW64_MAXIMUM_SUPPORTED_EXTENSION] of byte;
     end;
   PWOW64_CONTEXT = ^WOW64_CONTEXT;

  TFpContext = record
{$ifdef windows}
    case integer of
    {$ifdef cpux86_64}
    1: ( WOW: WOW64_CONTEXT;  // 32 bit / wow64
         Alignment1: array[1..16] of Byte;
       );
    {$endif}
    2: ( def: TCONTEXT;
         Alignment2: array[1..16] of Byte;
       );
{$endif}
  end;
  PFpContext = ^TFpContext;


implementation

uses
  SysUtils;

//function OpenThread(dwDesiredAccess: DWORD; bInheritHandle: BOOL; dwThreadId: DWORD): THandle; stdcall; external 'kernel32';
//function Wow64GetThreadContext(hThread: THandle; var lpContext: TContext): BOOL; stdcall; external 'kernel32';




function GetLastErrorText: String;
{$ifdef windows}
var
  i: DWORD;
{$endif}
begin
{$ifdef windows}
  i := GetLastError;
  Result := IntToStr(i) + ': ' + GetLastErrorText(i);
{$endif}
end;

function GetLastErrorText(AErrorCode: Cardinal): String;
{$ifdef windows}
var
  R: cardinal;
  Temp: PChar;
{$endif}
begin
{$ifdef windows}
  Temp := nil;
  R := FormatMessage(
         FORMAT_MESSAGE_ALLOCATE_BUFFER or FORMAT_MESSAGE_FROM_SYSTEM or FORMAT_MESSAGE_ARGUMENT_ARRAY,
         nil,
         AErrorCode,
         LANG_NEUTRAL,
         Pointer(@Temp), // the fuction needs either a PChar or a PPChar, depending on FORMAT_MESSAGE_ALLOCATE_BUFFER
         0,
         nil);
  if R = 0
  then begin
    Result := '';
  end
  else begin
    Result := Temp;
    SetLength(Result, Length(Result)-2);
  end;
  if Temp <> nil
  then LocalFree(HLOCAL(Temp));
{$endif}
end;

end.

