freepascal.compiler/rtl/win64/system.pp

{
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2006 by Florian Klaempfl and Pavel Ozerski
    member of the Free Pascal development team.

    FPC Pascal system unit for the Win64 API.

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    This program 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.

 **********************************************************************}
unit System;
interface


{ $define SYSTEMEXCEPTIONDEBUG}

{$ifdef SYSTEMDEBUG}
  {$define SYSTEMEXCEPTIONDEBUG}
{$endif SYSTEMDEBUG}

{ include system-independent routine headers }
{$I systemh.inc}

const
 LineEnding = #13#10;
 LFNSupport = true;
 DirectorySeparator = '\';
 DriveSeparator = ':';
 PathSeparator = ';';
{ FileNameCaseSensitive is defined separately below!!! }
 maxExitCode = 65535;
 MaxPathLen = 260;
 AllFilesMask = '*';

type
   PEXCEPTION_FRAME = ^TEXCEPTION_FRAME;
   TEXCEPTION_FRAME = record
     next : PEXCEPTION_FRAME;
     handler : pointer;
   end;

const
{ Default filehandles }
  UnusedHandle    : THandle = THandle(-1);
  StdInputHandle  : THandle = 0;
  StdOutputHandle : THandle = 0;
  StdErrorHandle  : THandle = 0;

  FileNameCaseSensitive : boolean = true;
  CtrlZMarksEOF: boolean = true; (* #26 is considered as end of file *)

  sLineBreak = LineEnding;
  DefaultTextLineBreakStyle : TTextLineBreakStyle = tlbsCRLF;

  { Thread count for DLL }
  Thread_count : longint = 0;

type
  TStartupInfo = record
    cb : longint;
    lpReserved : Pointer;
    lpDesktop : Pointer;
    lpTitle : Pointer;
    dwX : longint;
    dwY : longint;
    dwXSize : longint;
    dwYSize : longint;
    dwXCountChars : longint;
    dwYCountChars : longint;
    dwFillAttribute : longint;
    dwFlags : longint;
    wShowWindow : Word;
    cbReserved2 : Word;
    lpReserved2 : Pointer;
    hStdInput : THandle;
    hStdOutput : THandle;
    hStdError : THandle;
  end;

var
{ C compatible arguments }
  argc : longint;
  argv : ppchar;
{ Win32 Info }
  startupinfo : tstartupinfo;
  hprevinst,
  MainInstance,
  cmdshow     : longint;
  DLLreason,DLLparam:longint;
type
  TDLL_Process_Entry_Hook = function (dllparam : longint) : longbool;
  TDLL_Entry_Hook = procedure (dllparam : longint);

const
  Dll_Process_Attach_Hook : TDLL_Process_Entry_Hook = nil;
  Dll_Process_Detach_Hook : TDLL_Entry_Hook = nil;
  Dll_Thread_Attach_Hook : TDLL_Entry_Hook = nil;
  Dll_Thread_Detach_Hook : TDLL_Entry_Hook = nil;

implementation

var
  SysInstance : Longint;public;

{$define HAS_RESOURCES}
{$i winres.inc}

{ used by wstrings.inc because wstrings.inc is included before sysos.inc
  this is put here (FK) }

function SysAllocStringLen(psz:pointer;len:dword):pointer;stdcall;
 external 'oleaut32.dll' name 'SysAllocStringLen';

procedure SysFreeString(bstr:pointer);stdcall;
 external 'oleaut32.dll' name 'SysFreeString';

function SysReAllocStringLen(var bstr:pointer;psz: pointer;
  len:dword): Integer; stdcall;external 'oleaut32.dll' name 'SysReAllocStringLen';


{ include system independent routines }
{$I system.inc}

{*****************************************************************************
                              Parameter Handling
*****************************************************************************}

var
  ModuleName : array[0..255] of char;

function GetCommandFile:pchar;
begin
  GetModuleFileName(0,@ModuleName,255);
  GetCommandFile:=@ModuleName;
end;


procedure setup_arguments;
var
  arglen,
  count   : longint;
  argstart,
  pc,arg  : pchar;
  quote   : char;
  argvlen : longint;

  procedure allocarg(idx,len:longint);
    var
      oldargvlen : longint;
    begin
      if idx>=argvlen then
       begin
         oldargvlen:=argvlen;
         argvlen:=(idx+8) and (not 7);
         sysreallocmem(argv,argvlen*sizeof(pointer));
         fillchar(argv[oldargvlen],(argvlen-oldargvlen)*sizeof(pointer),0);
       end;
      { use realloc to reuse already existing memory }
      { always allocate, even if length is zero, since }
      { the arg. is still present!                     }
      sysreallocmem(argv[idx],len+1);
    end;

begin
  SetupProcVars;
  { create commandline, it starts with the executed filename which is argv[0] }
  { Win32 passes the command NOT via the args, but via getmodulefilename}
  count:=0;
  argv:=nil;
  argvlen:=0;
  pc:=getcommandfile;
  Arglen:=0;
  repeat
    Inc(Arglen);
  until (pc[Arglen]=#0);
  allocarg(count,arglen);
  move(pc^,argv[count]^,arglen+1);
  { Setup cmdline variable }
  cmdline:=GetCommandLine;
  { process arguments }
  pc:=cmdline;
{$IfDef SYSTEM_DEBUG_STARTUP}
  Writeln(stderr,'Win32 GetCommandLine is #',pc,'#');
{$EndIf }
  while pc^<>#0 do
   begin
     { skip leading spaces }
     while pc^ in [#1..#32] do
      inc(pc);
     if pc^=#0 then
      break;
     { calc argument length }
     quote:=' ';
     argstart:=pc;
     arglen:=0;
     while (pc^<>#0) do
      begin
        case pc^ of
          #1..#32 :
            begin
              if quote<>' ' then
               inc(arglen)
              else
               break;
            end;
          '"' :
            begin
              if quote<>'''' then
               begin
                 if pchar(pc+1)^<>'"' then
                  begin
                    if quote='"' then
                     quote:=' '
                    else
                     quote:='"';
                  end
                 else
                  inc(pc);
               end
              else
               inc(arglen);
            end;
          '''' :
            begin
              if quote<>'"' then
               begin
                 if pchar(pc+1)^<>'''' then
                  begin
                    if quote=''''  then
                     quote:=' '
                    else
                     quote:='''';
                  end
                 else
                  inc(pc);
               end
              else
               inc(arglen);
            end;
          else
            inc(arglen);
        end;
        inc(pc);
      end;
     { copy argument }
     { Don't copy the first one, it is already there.}
     If Count<>0 then
      begin
        allocarg(count,arglen);
        quote:=' ';
        pc:=argstart;
        arg:=argv[count];
        while (pc^<>#0) do
         begin
           case pc^ of
             #1..#32 :
               begin
                 if quote<>' ' then
                  begin
                    arg^:=pc^;
                    inc(arg);
                  end
                 else
                  break;
               end;
             '"' :
               begin
                 if quote<>'''' then
                  begin
                    if pchar(pc+1)^<>'"' then
                     begin
                       if quote='"' then
                        quote:=' '
                       else
                        quote:='"';
                     end
                    else
                     inc(pc);
                  end
                 else
                  begin
                    arg^:=pc^;
                    inc(arg);
                  end;
               end;
             '''' :
               begin
                 if quote<>'"' then
                  begin
                    if pchar(pc+1)^<>'''' then
                     begin
                       if quote=''''  then
                        quote:=' '
                       else
                        quote:='''';
                     end
                    else
                     inc(pc);
                  end
                 else
                  begin
                    arg^:=pc^;
                    inc(arg);
                  end;
               end;
             else
               begin
                 arg^:=pc^;
                 inc(arg);
               end;
           end;
           inc(pc);
         end;
        arg^:=#0;
      end;
 {$IfDef SYSTEM_DEBUG_STARTUP}
     Writeln(stderr,'dos arg ',count,' #',arglen,'#',argv[count],'#');
 {$EndIf SYSTEM_DEBUG_STARTUP}
     inc(count);
   end;
  { get argc and create an nil entry }
  argc:=count;
  allocarg(argc,0);
  { free unused memory }
  sysreallocmem(argv,(argc+1)*sizeof(pointer));
end;


function paramcount : longint;
begin
  paramcount := argc - 1;
end;

function paramstr(l : longint) : string;
begin
  if (l>=0) and (l<argc) then
    paramstr:=strpas(argv[l])
  else
    paramstr:='';
end;


procedure randomize;
begin
  randseed:=GetTickCount;
end;


{*****************************************************************************
                         System Dependent Exit code
*****************************************************************************}

procedure install_exception_handlers;forward;
procedure remove_exception_handlers;forward;
procedure PascalMain;stdcall;external name 'PASCALMAIN';
procedure fpc_do_exit;stdcall;external name 'FPC_DO_EXIT';
Procedure ExitDLL(Exitcode : longint); forward;

Procedure system_exit;
begin
  { don't call ExitProcess inside
    the DLL exit code !!
    This crashes Win95 at least PM }
  if IsLibrary then
    ExitDLL(ExitCode);
  if not IsConsole then
   begin
     Close(stderr);
     Close(stdout);
     Close(erroutput);
     Close(Input);
     Close(Output);
     { what about Input and Output ?? PM }
     { now handled, FPK }
   end;
  remove_exception_handlers;

  { call exitprocess, with cleanup as required }
  ExitProcess(exitcode);
end;

var
  { old compilers emitted a reference to _fltused if a module contains
    floating type code so the linker could leave away floating point
    libraries or not. VC does this as well so we need to define this
    symbol as well (FK)
  }
  _fltused : int64;cvar;public;
  { value of the stack segment
    to check if the call stack can be written on exceptions }
  _SS : Cardinal;

procedure Exe_entry;[public,alias:'_FPC_EXE_Entry'];
  var
    ST : pointer;
  begin
     IsLibrary:=false;
     { install the handlers for exe only ?
       or should we install them for DLL also ? (PM) }
     install_exception_handlers;
     ExitCode:=0;
     asm
        { keep stack aligned }
        pushq $0
        pushq %rbp
        movq %rsp,%rax
        movq %rax,st
     end;
     StackTop:=st;
     asm
        xorl %rax,%rax
        movw %ss,%ax
        movl %eax,_SS
        xorl %rbp,%rbp
        call PASCALMAIN
        popq %rbp
        popq %rax
     end;
     { if we pass here there was no error ! }
     system_exit;
  end;


Const
  { DllEntryPoint  }
     DLL_PROCESS_ATTACH = 1;
     DLL_THREAD_ATTACH = 2;
     DLL_PROCESS_DETACH = 0;
     DLL_THREAD_DETACH = 3;
Var
     DLLBuf : Jmp_buf;
Const
     DLLExitOK : boolean = true;

function Dll_entry : longbool;
var
  res : longbool;

  begin
     IsLibrary:=true;
     Dll_entry:=false;
     case DLLreason of
       DLL_PROCESS_ATTACH :
         begin
           If SetJmp(DLLBuf) = 0 then
             begin
               if assigned(Dll_Process_Attach_Hook) then
                 begin
                   res:=Dll_Process_Attach_Hook(DllParam);
                   if not res then
                     exit(false);
                 end;
               PASCALMAIN;
               Dll_entry:=true;
             end
           else
             Dll_entry:=DLLExitOK;
         end;
       DLL_THREAD_ATTACH :
         begin
           inclocked(Thread_count);
{$warning Allocate Threadvars !}
           if assigned(Dll_Thread_Attach_Hook) then
             Dll_Thread_Attach_Hook(DllParam);
           Dll_entry:=true; { return value is ignored }
         end;
       DLL_THREAD_DETACH :
         begin
           declocked(Thread_count);
           if assigned(Dll_Thread_Detach_Hook) then
             Dll_Thread_Detach_Hook(DllParam);
{$warning Release Threadvars !}
           Dll_entry:=true; { return value is ignored }
         end;
       DLL_PROCESS_DETACH :
         begin
           Dll_entry:=true; { return value is ignored }
           If SetJmp(DLLBuf) = 0 then
             begin
               FPC_DO_EXIT;
             end;
           if assigned(Dll_Process_Detach_Hook) then
             Dll_Process_Detach_Hook(DllParam);
         end;
     end;
  end;

Procedure ExitDLL(Exitcode : longint);
begin
    DLLExitOK:=ExitCode=0;
    LongJmp(DLLBuf,1);
end;

{$ifndef VER2_0}

procedure _FPC_mainCRTStartup;stdcall;public name '_mainCRTStartup';
begin
  IsConsole:=true;
  Exe_entry;
end;


procedure _FPC_WinMainCRTStartup;stdcall;public name '_WinMainCRTStartup';
begin
  IsConsole:=false;
  Exe_entry;
end;


procedure _FPC_DLLMainCRTStartup(_hinstance,_dllreason,_dllparam:longint);stdcall;public name '_DLLMainCRTStartup';
begin
  IsConsole:=true;
  sysinstance:=_hinstance;
  dllreason:=_dllreason;
  dllparam:=_dllparam;
  DLL_Entry;
end;


procedure _FPC_DLLWinMainCRTStartup(_hinstance,_dllreason,_dllparam:longint);stdcall;public name '_DLLWinMainCRTStartup';
begin
  IsConsole:=false;
  sysinstance:=_hinstance;
  dllreason:=_dllreason;
  dllparam:=_dllparam;
  DLL_Entry;
end;

{$endif VER2_0}


function GetCurrentProcess : dword;
 stdcall;external 'kernel32' name 'GetCurrentProcess';

function ReadProcessMemory(process : dword;address : pointer;dest : pointer;size : dword;bytesread : pdword) :  longbool;
 stdcall;external 'kernel32' name 'ReadProcessMemory';

function is_prefetch(p : pointer) : boolean;
  var
    a : array[0..15] of byte;
    doagain : boolean;
    instrlo,instrhi,opcode : byte;
    i : longint;
  begin
    result:=false;
    { read memory savely without causing another exeception }
    if not(ReadProcessMemory(GetCurrentProcess,p,@a,sizeof(a),nil)) then
      exit;
    i:=0;
    doagain:=true;
    while doagain and (i<15) do
      begin
        opcode:=a[i];
        instrlo:=opcode and $f;
        instrhi:=opcode and $f0;
        case instrhi of
          { prefix? }
          $20,$30:
            doagain:=(instrlo and 7)=6;
          $60:
            doagain:=(instrlo and $c)=4;
          $f0:
            doagain:=instrlo in [0,2,3];
          $0:
            begin
              result:=(instrlo=$f) and (a[i+1] in [$d,$18]);
              exit;
            end;
          else
            doagain:=false;
        end;
        inc(i);
      end;
  end;


//
// Hardware exception handling
//

{
  Error code definitions for the Win32 API functions


  Values are 32 bit values layed out as follows:
   3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
   1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
  +---+-+-+-----------------------+-------------------------------+
  |Sev|C|R|     Facility          |               Code            |
  +---+-+-+-----------------------+-------------------------------+

  where
      Sev - is the severity code
          00 - Success
          01 - Informational
          10 - Warning
          11 - Error

      C - is the Customer code flag
      R - is a reserved bit
      Facility - is the facility code
      Code - is the facility's status code
}

const
  SEVERITY_SUCCESS                        = $00000000;
  SEVERITY_INFORMATIONAL                  = $40000000;
  SEVERITY_WARNING                        = $80000000;
  SEVERITY_ERROR                          = $C0000000;

const
  STATUS_SEGMENT_NOTIFICATION             = $40000005;
  DBG_TERMINATE_THREAD                    = $40010003;
  DBG_TERMINATE_PROCESS                   = $40010004;
  DBG_CONTROL_C                           = $40010005;
  DBG_CONTROL_BREAK                       = $40010008;

  STATUS_GUARD_PAGE_VIOLATION             = $80000001;
  STATUS_DATATYPE_MISALIGNMENT            = $80000002;
  STATUS_BREAKPOINT                       = $80000003;
  STATUS_SINGLE_STEP                      = $80000004;
  DBG_EXCEPTION_NOT_HANDLED               = $80010001;

  STATUS_ACCESS_VIOLATION                 = $C0000005;
  STATUS_IN_PAGE_ERROR                    = $C0000006;
  STATUS_INVALID_HANDLE                   = $C0000008;
  STATUS_NO_MEMORY                        = $C0000017;
  STATUS_ILLEGAL_INSTRUCTION              = $C000001D;
  STATUS_NONCONTINUABLE_EXCEPTION         = $C0000025;
  STATUS_INVALID_DISPOSITION              = $C0000026;
  STATUS_ARRAY_BOUNDS_EXCEEDED            = $C000008C;
  STATUS_FLOAT_DENORMAL_OPERAND           = $C000008D;
  STATUS_FLOAT_DIVIDE_BY_ZERO             = $C000008E;
  STATUS_FLOAT_INEXACT_RESULT             = $C000008F;
  STATUS_FLOAT_INVALID_OPERATION          = $C0000090;
  STATUS_FLOAT_OVERFLOW                   = $C0000091;
  STATUS_FLOAT_STACK_CHECK                = $C0000092;
  STATUS_FLOAT_UNDERFLOW                  = $C0000093;
  STATUS_INTEGER_DIVIDE_BY_ZERO           = $C0000094;
  STATUS_INTEGER_OVERFLOW                 = $C0000095;
  STATUS_PRIVILEGED_INSTRUCTION           = $C0000096;
  STATUS_STACK_OVERFLOW                   = $C00000FD;
  STATUS_CONTROL_C_EXIT                   = $C000013A;
  STATUS_FLOAT_MULTIPLE_FAULTS            = $C00002B4;
  STATUS_FLOAT_MULTIPLE_TRAPS             = $C00002B5;
  STATUS_REG_NAT_CONSUMPTION              = $C00002C9;

  EXCEPTION_EXECUTE_HANDLER               = 1;
  EXCEPTION_CONTINUE_EXECUTION            = -1;
  EXCEPTION_CONTINUE_SEARCH               = 0;

  EXCEPTION_MAXIMUM_PARAMETERS            = 15;

  CONTEXT_X86                             = $00010000;
  CONTEXT_CONTROL                         = CONTEXT_X86 or $00000001;
  CONTEXT_INTEGER                         = CONTEXT_X86 or $00000002;
  CONTEXT_SEGMENTS                        = CONTEXT_X86 or $00000004;
  CONTEXT_FLOATING_POINT                  = CONTEXT_X86 or $00000008;
  CONTEXT_DEBUG_REGISTERS                 = CONTEXT_X86 or $00000010;
  CONTEXT_EXTENDED_REGISTERS              = CONTEXT_X86 or $00000020;

  CONTEXT_FULL                            = CONTEXT_CONTROL or CONTEXT_INTEGER or CONTEXT_SEGMENTS;

  MAXIMUM_SUPPORTED_EXTENSION             = 512;

type
  M128A = record
    Low : QWord;
    High : Int64;
  end;

  PContext = ^TContext;
  TContext = record
    P1Home : QWord;
    P2Home : QWord;
    P3Home : QWord;
    P4Home : QWord;
    P5Home : QWord;
    P6Home : QWord;
    ContextFlags : DWord;
    MxCsr : DWord;
    SegCs : word;
    SegDs : word;
    SegEs : word;
    SegFs : word;
    SegGs : word;
    SegSs : word;
    EFlags : DWord;
    Dr0 : QWord;
    Dr1 : QWord;
    Dr2 : QWord;
    Dr3 : QWord;
    Dr6 : QWord;
    Dr7 : QWord;
    Rax : QWord;
    Rcx : QWord;
    Rdx : QWord;
    Rbx : QWord;
    Rsp : QWord;
    Rbp : QWord;
    Rsi : QWord;
    Rdi : QWord;
    R8 : QWord;
    R9 : QWord;
    R10 : QWord;
    R11 : QWord;
    R12 : QWord;
    R13 : QWord;
    R14 : QWord;
    R15 : QWord;
    Rip : QWord;
    Header : array[0..1] of M128A;
    Legacy : array[0..7] of M128A;
    Xmm0 : M128A;
    Xmm1 : M128A;
    Xmm2 : M128A;
    Xmm3 : M128A;
    Xmm4 : M128A;
    Xmm5 : M128A;
    Xmm6 : M128A;
    Xmm7 : M128A;
    Xmm8 : M128A;
    Xmm9 : M128A;
    Xmm10 : M128A;
    Xmm11 : M128A;
    Xmm12 : M128A;
    Xmm13 : M128A;
    Xmm14 : M128A;
    Xmm15 : M128A;
    VectorRegister : array[0..25] of M128A;
    VectorControl : QWord;
    DebugControl : QWord;
    LastBranchToRip : QWord;
    LastBranchFromRip : QWord;
    LastExceptionToRip : QWord;
    LastExceptionFromRip : QWord;
 end;

type
  PExceptionRecord = ^TExceptionRecord;
  TExceptionRecord = record
    ExceptionCode   : DWord;
    ExceptionFlags  : DWord;
    ExceptionRecord : PExceptionRecord;
    ExceptionAddress : Pointer;
    NumberParameters : DWord;
    ExceptionInformation : array[0..EXCEPTION_MAXIMUM_PARAMETERS-1] of Pointer;
  end;

  PExceptionPointers = ^TExceptionPointers;
  TExceptionPointers = packed record
    ExceptionRecord   : PExceptionRecord;
    ContextRecord     : PContext;
  end;

  TVectoredExceptionHandler = function (excep : PExceptionPointers) : Longint;

function AddVectoredExceptionHandler(FirstHandler : DWORD;VectoredHandler : TVectoredExceptionHandler) : longint;
        external 'kernel32' name 'AddVectoredExceptionHandler';
const
  MaxExceptionLevel = 16;
  exceptLevel : Byte = 0;

var
  exceptRip       : array[0..MaxExceptionLevel-1] of Int64;
  exceptError     : array[0..MaxExceptionLevel-1] of Byte;
  resetFPU        : array[0..MaxExceptionLevel-1] of Boolean;

{$ifdef SYSTEMEXCEPTIONDEBUG}
procedure DebugHandleErrorAddrFrame(error : longint; addr, frame : pointer);
begin
  if IsConsole then
    begin
      write(stderr,'HandleErrorAddrFrame(error=',error);
      write(stderr,',addr=',hexstr(int64(addr),16));
      writeln(stderr,',frame=',hexstr(int64(frame),16),')');
    end;
  HandleErrorAddrFrame(error,addr,frame);
end;
{$endif SYSTEMEXCEPTIONDEBUG}

procedure JumpToHandleErrorFrame;
  var
    rip, rbp : int64;
    error : longint;
  begin
    // save ebp
    asm
      movq (%rbp),%rax
      movq %rax,rbp
    end;
    if exceptLevel>0 then
      dec(exceptLevel);

    rip:=exceptRip[exceptLevel];
    error:=exceptError[exceptLevel];
{$ifdef SYSTEMEXCEPTIONDEBUG}
    if IsConsole then
      writeln(stderr,'In JumpToHandleErrorFrame error=',error);
{$endif SYSTEMEXCEPTIONDEBUG}
    if resetFPU[exceptLevel] then
      SysResetFPU;
    { build a fake stack }
    asm
      movq   rbp,%r8
      movq   rip,%rdx
      movl   error,%ecx
      pushq  rip
      movq   rbp,%rbp // Change frame pointer

{$ifdef SYSTEMEXCEPTIONDEBUG}
      jmpl   DebugHandleErrorAddrFrame
{$else not SYSTEMEXCEPTIONDEBUG}
      jmpl   HandleErrorAddrFrame
{$endif SYSTEMEXCEPTIONDEBUG}
    end;
  end;


function syswin64_x86_64_exception_handler(excep : PExceptionPointers) : Longint;public;
  var
    res: longint;
    err: byte;
    must_reset_fpu: boolean;
  begin
    res:=EXCEPTION_CONTINUE_SEARCH;
{$ifdef SYSTEMEXCEPTIONDEBUG}
    if IsConsole then
      Writeln(stderr,'syswin64_x86_64_exception_handler called');
{$endif SYSTEMEXCEPTIONDEBUG}
    if excep^.ContextRecord^.SegSs=_SS then
      begin
        err := 0;
        must_reset_fpu := true;
{$ifdef SYSTEMEXCEPTIONDEBUG}
        if IsConsole then Writeln(stderr,'Exception ',
          hexstr(excep^.ExceptionRecord^.ExceptionCode,8));
{$endif SYSTEMEXCEPTIONDEBUG}
        case cardinal(excep^.ExceptionRecord^.ExceptionCode) of
          STATUS_INTEGER_DIVIDE_BY_ZERO,
          STATUS_FLOAT_DIVIDE_BY_ZERO :
            err := 200;
          STATUS_ARRAY_BOUNDS_EXCEEDED :
            begin
              err := 201;
              must_reset_fpu := false;
            end;
          STATUS_STACK_OVERFLOW :
            begin
              err := 202;
              must_reset_fpu := false;
            end;
          STATUS_FLOAT_OVERFLOW :
            err := 205;
          STATUS_FLOAT_DENORMAL_OPERAND,
          STATUS_FLOAT_UNDERFLOW :
            err := 206;
            { excep^.ContextRecord^.FloatSave.StatusWord := excep^.ContextRecord^.FloatSave.StatusWord and $ffffff00;}
          STATUS_FLOAT_INEXACT_RESULT,
          STATUS_FLOAT_INVALID_OPERATION,
          STATUS_FLOAT_STACK_CHECK :
            err := 207;
          STATUS_INTEGER_OVERFLOW :
            begin
              err := 215;
              must_reset_fpu := false;
            end;
          STATUS_ILLEGAL_INSTRUCTION:
            err := 216;
          STATUS_ACCESS_VIOLATION:
            { Athlon prefetch bug? }
            if is_prefetch(pointer(excep^.ContextRecord^.rip)) then
              begin
                { if yes, then retry }
                excep^.ExceptionRecord^.ExceptionCode := 0;
                res:=EXCEPTION_CONTINUE_EXECUTION;
              end
            else
              err := 216;

          STATUS_CONTROL_C_EXIT:
            err := 217;
          STATUS_PRIVILEGED_INSTRUCTION:
            begin
              err := 218;
              must_reset_fpu := false;
            end;
          else
            begin
              if ((excep^.ExceptionRecord^.ExceptionCode and SEVERITY_ERROR) = SEVERITY_ERROR) then
                err := 217
              else
                { pass through exceptions which aren't an error. The problem is that vectored handlers
                  always are called before structured ones so we see also internal exceptions of libraries.
                  I wonder if there is a better solution (FK)
                }
                res:=EXCEPTION_CONTINUE_SEARCH;
            end;
        end;

        if (err <> 0) and (exceptLevel < MaxExceptionLevel) then
          begin
            exceptRip[exceptLevel] := excep^.ContextRecord^.Rip;
            exceptError[exceptLevel] := err;
            resetFPU[exceptLevel] := must_reset_fpu;
            inc(exceptLevel);

            excep^.ContextRecord^.Rip := Int64(@JumpToHandleErrorFrame);
            excep^.ExceptionRecord^.ExceptionCode := 0;

            res := EXCEPTION_CONTINUE_EXECUTION;
{$ifdef SYSTEMEXCEPTIONDEBUG}
            if IsConsole then begin
              writeln(stderr,'Exception Continue Exception set at ',
                      hexstr(exceptRip[exceptLevel-1],16));
              writeln(stderr,'Rip changed to ',
                      hexstr(int64(@JumpToHandleErrorFrame),16), ' error=', err);
            end;
{$endif SYSTEMEXCEPTIONDEBUG}
        end;
    end;
    syswin64_x86_64_exception_handler := res;
  end;



procedure install_exception_handlers;
  begin
    AddVectoredExceptionHandler(1,@syswin64_x86_64_exception_handler);
  end;


procedure remove_exception_handlers;
  begin
  end;


procedure fpc_cpucodeinit;
  begin
  end;

{****************************************************************************
                      OS dependend widestrings
****************************************************************************}

const
  { MultiByteToWideChar  }
     MB_PRECOMPOSED = 1;
     CP_ACP = 0;

function MultiByteToWideChar(CodePage:UINT; dwFlags:DWORD; lpMultiByteStr:PChar; cchMultiByte:longint; lpWideCharStr:PWideChar;cchWideChar:longint):longint;
    stdcall; external 'kernel32' name 'MultiByteToWideChar';
function WideCharToMultiByte(CodePage:UINT; dwFlags:DWORD; lpWideCharStr:PWideChar; cchWideChar:longint; lpMultiByteStr:PChar;cchMultiByte:longint; lpDefaultChar:PChar; lpUsedDefaultChar:pointer):longint;
    stdcall; external 'kernel32' name 'WideCharToMultiByte';
function CharUpperBuff(lpsz:LPWSTR; cchLength:DWORD):DWORD;
    stdcall; external 'user32' name 'CharUpperBuffW';
function CharLowerBuff(lpsz:LPWSTR; cchLength:DWORD):DWORD;
    stdcall; external 'user32' name 'CharLowerBuffW';


procedure Win32Wide2AnsiMove(source:pwidechar;var dest:ansistring;len:SizeInt);
  var
    destlen: SizeInt;
  begin
    // retrieve length including trailing #0
    // not anymore, because this must also be usable for single characters
    destlen:=WideCharToMultiByte(CP_ACP, 0, source, len, nil, 0, nil, nil);
    // this will null-terminate
    setlength(dest, destlen);
    WideCharToMultiByte(CP_ACP, 0, source, len, @dest[1], destlen, nil, nil);
  end;

procedure Win32Ansi2WideMove(source:pchar;var dest:widestring;len:SizeInt);
  var
    destlen: SizeInt;
  begin
    // retrieve length including trailing #0
    // not anymore, because this must also be usable for single characters
    destlen:=MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, source, len, nil, 0);
    // this will null-terminate
    setlength(dest, destlen);
    MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, source, len, @dest[1], destlen);
  end;


function Win32WideUpper(const s : WideString) : WideString;
  begin
    result:=s;
    UniqueString(result);
    if length(result)>0 then
      CharUpperBuff(LPWSTR(result),length(result));
  end;


function Win32WideLower(const s : WideString) : WideString;
  begin
    result:=s;
    UniqueString(result);
    if length(result)>0 then
      CharLowerBuff(LPWSTR(result),length(result));
  end;


{ there is a similiar procedure in sysutils which inits the fields which
  are only relevant for the sysutils units }
procedure InitWin32Widestrings;
  begin
    widestringmanager.Wide2AnsiMoveProc:=@Win32Wide2AnsiMove;
    widestringmanager.Ansi2WideMoveProc:=@Win32Ansi2WideMove;
    widestringmanager.UpperWideStringProc:=@Win32WideUpper;
    widestringmanager.LowerWideStringProc:=@Win32WideLower;
  end;



{****************************************************************************
                    Error Message writing using messageboxes
****************************************************************************}

function MessageBox(w1:longint;l1,l2:pointer;w2:longint):longint;
   stdcall;external 'user32' name 'MessageBoxA';

const
  ErrorBufferLength = 1024;
var
  ErrorBuf : array[0..ErrorBufferLength] of char;
  ErrorLen : longint;

Function ErrorWrite(Var F: TextRec): Integer;
{
  An error message should always end with #13#10#13#10
}
var
  p : pchar;
  i : longint;
Begin
  if F.BufPos>0 then
   begin
     if F.BufPos+ErrorLen>ErrorBufferLength then
       i:=ErrorBufferLength-ErrorLen
     else
       i:=F.BufPos;
     Move(F.BufPtr^,ErrorBuf[ErrorLen],i);
     inc(ErrorLen,i);
     ErrorBuf[ErrorLen]:=#0;
   end;
  if ErrorLen>3 then
   begin
     p:=@ErrorBuf[ErrorLen];
     for i:=1 to 4 do
      begin
        dec(p);
        if not(p^ in [#10,#13]) then
         break;
      end;
   end;
   if ErrorLen=ErrorBufferLength then
     i:=4;
   if (i=4) then
    begin
      MessageBox(0,@ErrorBuf,pchar('Error'),0);
      ErrorLen:=0;
    end;
  F.BufPos:=0;
  ErrorWrite:=0;
End;


Function ErrorClose(Var F: TextRec): Integer;
begin
  if ErrorLen>0 then
   begin
     MessageBox(0,@ErrorBuf,pchar('Error'),0);
     ErrorLen:=0;
   end;
  ErrorLen:=0;
  ErrorClose:=0;
end;


Function ErrorOpen(Var F: TextRec): Integer;
Begin
  TextRec(F).InOutFunc:=@ErrorWrite;
  TextRec(F).FlushFunc:=@ErrorWrite;
  TextRec(F).CloseFunc:=@ErrorClose;
  ErrorOpen:=0;
End;


procedure AssignError(Var T: Text);
begin
  Assign(T,'');
  TextRec(T).OpenFunc:=@ErrorOpen;
  Rewrite(T);
end;


procedure SysInitStdIO;
begin
  { Setup stdin, stdout and stderr, for GUI apps redirect stderr,stdout to be
    displayed in a messagebox }
  StdInputHandle:=THandle(GetStdHandle(STD_INPUT_HANDLE));
  StdOutputHandle:=THandle(GetStdHandle(STD_OUTPUT_HANDLE));
  StdErrorHandle:=THandle(GetStdHandle(STD_ERROR_HANDLE));
  if not IsConsole then
   begin
     AssignError(stderr);
     AssignError(stdout);
     Assign(Output,'');
     Assign(Input,'');
     Assign(ErrOutput,'');
   end
  else
   begin
     OpenStdIO(Input,fmInput,StdInputHandle);
     OpenStdIO(Output,fmOutput,StdOutputHandle);
     OpenStdIO(ErrOutput,fmOutput,StdErrorHandle);
     OpenStdIO(StdOut,fmOutput,StdOutputHandle);
     OpenStdIO(StdErr,fmOutput,StdErrorHandle);
   end;
end;

(* ProcessID cached to avoid repeated calls to GetCurrentProcess. *)

var
  ProcessID: SizeUInt;

function GetProcessID: SizeUInt;
begin
 GetProcessID := ProcessID;
end;


function CheckInitialStkLen(stklen : SizeUInt) : SizeUInt;assembler;
asm
  movq  %gs:(8),%rax
  subq  %gs:(16),%rax
end;


begin
  SysResetFPU;
  if not(IsLibrary) then
    SysInitFPU;
  { pass dummy value }
  StackLength := CheckInitialStkLen($1000000);
  StackBottom := StackTop - StackLength;
  { get some helpful informations }
  GetStartupInfo(@startupinfo);
  { some misc Win32 stuff }
  hprevinst:=0;
  if not IsLibrary then
    SysInstance:=getmodulehandle(GetCommandFile);
  MainInstance:=HInstance;
  cmdshow:=startupinfo.wshowwindow;
  { Setup heap }
  InitHeap;
  SysInitExceptions;
  { setup fastmove stuff }
  fpc_cpucodeinit;
  SysInitStdIO;
  { Arguments }
  setup_arguments;
  { Reset IO Error }
  InOutRes:=0;
  ProcessID := GetCurrentProcessID;
  { threading }
  InitSystemThreads;
  { Reset internal error variable }
  errno:=0;
  initvariantmanager;
  initwidestringmanager;
  InitWin32Widestrings;
  DispCallByIDProc:=@DoDispCallByIDError;
end.