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fpc/rtl/win32/system.pp

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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2005 by Florian Klaempfl and Pavel Ozerski
member of the Free Pascal development team.
FPC Pascal system unit for the Win32 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
{$define FPC_IS_SYSTEM}
{$ifdef SYSTEMDEBUG}
{$define SYSTEMEXCEPTIONDEBUG}
{$endif SYSTEMDEBUG}
{$ifdef VER3_0}
{ 3.1.1+ do not require this anymore }
{$define FPC_HAS_INDIRECT_ENTRY_INFORMATION}
{$endif VER3_0}
{$ifdef cpui386}
{$define Set_i386_Exception_handler}
{$endif cpui386}
{$define DISABLE_NO_THREAD_MANAGER}
{$define HAS_WIDESTRINGMANAGER}
{$define DISABLE_NO_DYNLIBS_MANAGER}
{$define FPC_SYSTEM_HAS_SYSDLH}
{$define FPC_HAS_SETCTRLBREAKHANDLER}
{$ifdef FPC_USE_WIN32_SEH}
{$define FPC_SYSTEM_HAS_RAISEEXCEPTION}
{$define FPC_SYSTEM_HAS_RERAISE}
{$define FPC_SYSTEM_HAS_DONEEXCEPTION}
{$define FPC_SYSTEM_HAS_SAFECALLHANDLER}
{$endif FPC_USE_WIN32_SEH}
{ include system-independent routine headers }
{$I systemh.inc}
{ include common windows headers }
{$I syswinh.inc}
var
MainInstance : longint;
implementation
var
FPCSysInstance : PLongint;public name '_FPC_SysInstance';
{$define FPC_SYSTEM_HAS_OSSETUPENTRYINFORMATION}
procedure OsSetupEntryInformation(constref info: TEntryInformation); forward;
{$ifdef FPC_USE_WIN32_SEH}
function main_wrapper(arg: Pointer; proc: Pointer): ptrint; forward;
procedure OutermostHandler; external name '__FPC_DEFAULT_HANDLER';
{$endif FPC_USE_WIN32_SEH}
{$define FPC_SYSTEM_HAS_STACKTOP}
function StackTop: pointer; assembler;nostackframe;
asm
movl %fs:(4),%eax
end;
{ include system independent routines }
{$I system.inc}
{ include code common with win64 }
{$I syswin.inc}
procedure OsSetupEntryInformation(constref info: TEntryInformation);
begin
TlsKey := info.OS.TlsKeyAddr;
FPCSysInstance := info.OS.SysInstance;
WStrInitTablesTable := info.OS.WideInitTables;
end;
{*****************************************************************************
System Dependent Exit code
*****************************************************************************}
{$ifndef FPC_USE_WIN32_SEH}
procedure install_exception_handlers;forward;
procedure remove_exception_handlers;forward;
{$endif FPC_USE_WIN32_SEH}
Procedure system_exit;
begin
if IsLibrary then
begin
{ If exiting from DLL_PROCESS_ATTACH/DETACH, unwind to DllMain context. }
if DllInitState in [DLL_PROCESS_ATTACH,DLL_PROCESS_DETACH] then
LongJmp(DLLBuf,1)
else
{ Abnormal termination, Halt has been called from DLL function,
put down the entire process (DLL_PROCESS_DETACH will still
occur). At this point RTL has been already finalized in InternalExit
and shouldn't be finalized another time in DLL_PROCESS_DETACH.
Indicate this by resetting MainThreadIdWin32. }
MainThreadIDWin32:=0;
end;
if not IsConsole then
begin
Close(stderr);
Close(stdout);
Close(erroutput);
Close(Input);
Close(Output);
{ what about Input and Output ?? PM }
{ now handled, FPK }
end;
if Ole32Dll <> 0 then
begin
WinFreeLibrary(Ole32Dll); { Careful, FreeLibrary should not be called from DllMain. }
Ole32Dll := 0;
end;
{$ifndef FPC_USE_WIN32_SEH}
if not IsLibrary then
remove_exception_handlers;
{$endif FPC_USE_WIN32_SEH}
{ do cleanup required by the startup code }
EntryInformation.OS.asm_exit();
{ call exitprocess, with cleanup as required }
ExitProcess(exitcode);
end;
var
{ value of the stack segment
to check if the call stack can be written on exceptions }
_SS : Cardinal;
procedure Exe_entry(constref info : TEntryInformation);[public,alias:'_FPC_EXE_Entry'];
var
xframe: TEXCEPTION_FRAME;
begin
SetupEntryInformation(info);
IsLibrary:=false;
{ install the handlers for exe only ?
or should we install them for DLL also ? (PM) }
{$ifndef FPC_USE_WIN32_SEH}
install_exception_handlers;
{$endif FPC_USE_WIN32_SEH}
{ This strange construction is needed to solve the _SS problem
with a smartlinked syswin32 (PFV) }
asm
{ movl %esp,%fs:(0)
but don't insert it as it doesn't
point to anything yet
this will be used in signals unit }
leal xframe,%eax
movl %fs:(0),%ecx
movl %ecx,TException_Frame.next(%eax)
movl %eax,System_exception_frame
{$ifndef FPC_USE_WIN32_SEH}
movl $0,TException_Frame.handler(%eax)
{$else}
movl $OutermostHandler,TException_Frame.handler(%eax)
movl %eax,%fs:(0)
{$endif FPC_USE_WIN32_SEH}
pushl %ebp
xorl %eax,%eax
movw %ss,%ax
movl %eax,_SS
xorl %ebp,%ebp
end;
EntryInformation.PascalMain();
asm
popl %ebp
end;
{ if we pass here there was no error ! }
system_exit;
end;
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,$18]);
exit;
end;
else
doagain:=false;
end;
inc(i);
end;
end;
//
// Hardware exception handling
//
{$ifdef Set_i386_Exception_handler}
type
PFloatingSaveArea = ^TFloatingSaveArea;
TFloatingSaveArea = packed record
ControlWord : Cardinal;
StatusWord : Cardinal;
TagWord : Cardinal;
ErrorOffset : Cardinal;
ErrorSelector : Cardinal;
DataOffset : Cardinal;
DataSelector : Cardinal;
RegisterArea : array[0..79] of Byte;
Cr0NpxState : Cardinal;
end;
PContext = ^TContext;
TContext = packed record
//
// The flags values within this flag control the contents of
// a CONTEXT record.
//
ContextFlags : Cardinal;
//
// This section is specified/returned if CONTEXT_DEBUG_REGISTERS is
// set in ContextFlags. Note that CONTEXT_DEBUG_REGISTERS is NOT
// included in CONTEXT_FULL.
//
Dr0, Dr1, Dr2,
Dr3, Dr6, Dr7 : Cardinal;
//
// This section is specified/returned if the
// ContextFlags word contains the flag CONTEXT_FLOATING_POINT.
//
FloatSave : TFloatingSaveArea;
//
// This section is specified/returned if the
// ContextFlags word contains the flag CONTEXT_SEGMENTS.
//
SegGs, SegFs,
SegEs, SegDs : Cardinal;
//
// This section is specified/returned if the
// ContextFlags word contains the flag CONTEXT_INTEGER.
//
Edi, Esi, Ebx,
Edx, Ecx, Eax : Cardinal;
//
// This section is specified/returned if the
// ContextFlags word contains the flag CONTEXT_CONTROL.
//
Ebp : Cardinal;
Eip : Cardinal;
SegCs : Cardinal;
EFlags, Esp, SegSs : Cardinal;
//
// This section is specified/returned if the ContextFlags word
// contains the flag CONTEXT_EXTENDED_REGISTERS.
// The format and contexts are processor specific
//
ExtendedRegisters : array[0..MAXIMUM_SUPPORTED_EXTENSION-1] of Byte;
end;
PExceptionPointers = ^TExceptionPointers;
TExceptionPointers = packed record
ExceptionRecord : PExceptionRecord;
ContextRecord : PContext;
end;
{ type of functions that should be used for exception handling }
TTopLevelExceptionFilter = function (excep : PExceptionPointers) : Longint;stdcall;
{$i seh32.inc}
{$ifndef FPC_USE_WIN32_SEH}
function SetUnhandledExceptionFilter(lpTopLevelExceptionFilter : TTopLevelExceptionFilter) : TTopLevelExceptionFilter;
stdcall;external 'kernel32' name 'SetUnhandledExceptionFilter';
const
MaxExceptionLevel = 16;
exceptLevel : Byte = 0;
var
exceptEip : array[0..MaxExceptionLevel-1] of Longint;
exceptError : array[0..MaxExceptionLevel-1] of Byte;
resetFPU : array[0..MaxExceptionLevel-1] of Boolean;
{$ifdef SYSTEMEXCEPTIONDEBUG}
procedure DebugHandleErrorAddrFrame(error : longint; addr, frame : pointer);
begin
if IsConsole then
begin
write(stderr,'HandleErrorAddrFrame(error=',error);
write(stderr,',addr=',hexstr(ptruint(addr),8));
writeln(stderr,',frame=',hexstr(ptruint(frame),8),')');
end;
HandleErrorAddrFrame(error,addr,frame);
end;
{$endif SYSTEMEXCEPTIONDEBUG}
procedure JumpToHandleErrorFrame;
var
eip, ebp, error : Longint;
begin
// save ebp
asm
movl (%ebp),%eax
movl %eax,ebp
end;
if (exceptLevel > 0) then
dec(exceptLevel);
eip:=exceptEip[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
movl ebp,%ecx
movl eip,%edx
movl error,%eax
pushl eip
movl ebp,%ebp // Change frame pointer
{$ifdef SYSTEMEXCEPTIONDEBUG}
jmpl DebugHandleErrorAddrFrame
{$else not SYSTEMEXCEPTIONDEBUG}
jmpl HandleErrorAddrFrame
{$endif SYSTEMEXCEPTIONDEBUG}
end;
end;
function syswin32_i386_exception_handler(excep : PExceptionPointers) : Longint;stdcall;
var
res,ssecode: longint;
err: byte;
must_reset_fpu: boolean;
begin
res := EXCEPTION_CONTINUE_SEARCH;
if excep^.ContextRecord^.SegSs=_SS then begin
err := 0;
must_reset_fpu := true;
{$ifdef SYSTEMEXCEPTIONDEBUG}
if IsConsole then Writeln(stderr,'Exception ',
hexstr(excep^.ExceptionRecord^.ExceptionCode, 8));
{$endif SYSTEMEXCEPTIONDEBUG}
case excep^.ExceptionRecord^.ExceptionCode of
STATUS_INTEGER_DIVIDE_BY_ZERO :
err := 200;
STATUS_FLOAT_DIVIDE_BY_ZERO :
err := 208;
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 $ffffff00;}
STATUS_FLOAT_INEXACT_RESULT,
STATUS_FLOAT_INVALID_OPERATION,
STATUS_FLOAT_STACK_CHECK :
err := 207;
STATUS_INTEGER_OVERFLOW :
begin
err := 215;
must_reset_fpu := false;
end;
STATUS_ILLEGAL_INSTRUCTION:
{ if we're testing sse support, simply set the flag and continue }
if sse_check then
begin
os_supports_sse:=false;
{ skip the offending movaps %xmm7, %xmm6 instruction }
inc(excep^.ContextRecord^.Eip,3);
excep^.ExceptionRecord^.ExceptionCode := 0;
res:=EXCEPTION_CONTINUE_EXECUTION;
end
else
err := 216;
STATUS_ACCESS_VIOLATION:
{ Athlon prefetch bug? }
if is_prefetch(pointer(excep^.ContextRecord^.Eip)) then
begin
{ if yes, then retry }
excep^.ExceptionRecord^.ExceptionCode := 0;
res:=EXCEPTION_CONTINUE_EXECUTION;
end
else
err := 216;
STATUS_CONTROL_C_EXIT:
err := 217;
STATUS_PRIVILEGED_INSTRUCTION:
begin
err := 218;
must_reset_fpu := false;
end;
STATUS_FLOAT_MULTIPLE_FAULTS,
STATUS_FLOAT_MULTIPLE_TRAPS:
begin
{ dumping ExtendedRegisters and comparing with the actually value of mxcsr revealed 24 }
TranslateMxcsr(excep^.ContextRecord^.ExtendedRegisters[24],ssecode);
{$ifdef SYSTEMEXCEPTIONDEBUG}
if IsConsole then
Writeln(stderr,'MXSR: ',hexstr(excep^.ContextRecord^.ExtendedRegisters[24], 2),' SSECODE: ',ssecode);
{$endif SYSTEMEXCEPTIONDEBUG}
err:=-ssecode;
end;
else
begin
if ((excep^.ExceptionRecord^.ExceptionCode and SEVERITY_ERROR) = SEVERITY_ERROR) then
err := 217
else
err := 255;
end;
end;
if (err <> 0) and (exceptLevel < MaxExceptionLevel) then begin
exceptEip[exceptLevel] := excep^.ContextRecord^.Eip;
exceptError[exceptLevel] := err;
resetFPU[exceptLevel] := must_reset_fpu;
inc(exceptLevel);
excep^.ContextRecord^.Eip := Longint(@JumpToHandleErrorFrame);
excep^.ExceptionRecord^.ExceptionCode := 0;
res := EXCEPTION_CONTINUE_EXECUTION;
{$ifdef SYSTEMEXCEPTIONDEBUG}
if IsConsole then begin
writeln(stderr,'Exception Continue Exception set at ',
hexstr(exceptEip[exceptLevel],8));
writeln(stderr,'Eip changed to ',
hexstr(longint(@JumpToHandleErrorFrame),8), ' error=', err);
end;
{$endif SYSTEMEXCEPTIONDEBUG}
end;
end;
syswin32_i386_exception_handler := res;
end;
procedure install_exception_handlers;
begin
SetUnhandledExceptionFilter(@syswin32_i386_exception_handler);
end;
procedure remove_exception_handlers;
begin
SetUnhandledExceptionFilter(nil);
end;
{$endif not FPC_USE_WIN32_SEH}
{$else not cpui386 (Processor specific !!)}
procedure install_exception_handlers;
begin
end;
procedure remove_exception_handlers;
begin
end;
{$endif Set_i386_Exception_handler}
{$ifdef FPC_SECTION_THREADVARS}
function fpc_tls_add(addr: pointer): pointer; assembler; nostackframe;
[public,alias: 'FPC_TLS_ADD']; compilerproc;
asm
sub $tls_data_start,%eax
cmpb $0,IsLibrary
mov _tls_index,%ecx
jnz .L1
mov %fs:(0x2c),%edx
add (%edx,%ecx,4),%eax
ret
.L1:
push %ebx
mov %eax,%ebx
call GetLastError
push %eax { save LastError }
push _tls_index
call TlsGetValue
test %eax,%eax
jnz .L2
{ This can happen when a thread existed before DLL was loaded,
or if DisableThreadLibraryCalls was called. }
call SysAllocateThreadVars
mov $0x1000000,%eax
call InitThread
push _tls_index
call TlsGetValue
.L2:
add %eax,%ebx
call SetLastError { restore (value is on stack) }
mov %ebx,%eax
pop %ebx
end;
{$endif FPC_SECTION_THREADVARS}
function CheckInitialStkLen(stklen : SizeUInt) : SizeUInt;
type
tdosheader = packed record
e_magic : word;
e_cblp : word;
e_cp : word;
e_crlc : word;
e_cparhdr : word;
e_minalloc : word;
e_maxalloc : word;
e_ss : word;
e_sp : word;
e_csum : word;
e_ip : word;
e_cs : word;
e_lfarlc : word;
e_ovno : word;
e_res : array[0..3] of word;
e_oemid : word;
e_oeminfo : word;
e_res2 : array[0..9] of word;
e_lfanew : longint;
end;
tpeheader = packed record
PEMagic : longint;
Machine : word;
NumberOfSections : word;
TimeDateStamp : longint;
PointerToSymbolTable : longint;
NumberOfSymbols : longint;
SizeOfOptionalHeader : word;
Characteristics : word;
Magic : word;
MajorLinkerVersion : byte;
MinorLinkerVersion : byte;
SizeOfCode : longint;
SizeOfInitializedData : longint;
SizeOfUninitializedData : longint;
AddressOfEntryPoint : longint;
BaseOfCode : longint;
BaseOfData : longint;
ImageBase : longint;
SectionAlignment : longint;
FileAlignment : longint;
MajorOperatingSystemVersion : word;
MinorOperatingSystemVersion : word;
MajorImageVersion : word;
MinorImageVersion : word;
MajorSubsystemVersion : word;
MinorSubsystemVersion : word;
Reserved1 : longint;
SizeOfImage : longint;
SizeOfHeaders : longint;
CheckSum : longint;
Subsystem : word;
DllCharacteristics : word;
SizeOfStackReserve : longint;
SizeOfStackCommit : longint;
SizeOfHeapReserve : longint;
SizeOfHeapCommit : longint;
LoaderFlags : longint;
NumberOfRvaAndSizes : longint;
DataDirectory : array[1..$80] of byte;
end;
begin
result:=tpeheader((pointer(getmodulehandle(nil))+(tdosheader(pointer(getmodulehandle(nil))^).e_lfanew))^).SizeOfStackReserve;
end;
initialization
{ get some helpful informations }
GetStartupInfo(@startupinfo);
{ some misc Win32 stuff }
if not IsLibrary then
FPCSysInstance^:=getmodulehandle(nil);
MainInstance:=FPCSysInstance^;
{ pass dummy value }
StackLength := CheckInitialStkLen($1000000);
StackBottom := StackTop - StackLength;
cmdshow:=startupinfo.wshowwindow;
{ Setup heap and threading, these may be already initialized from TLS callback }
if not Assigned(CurrentTM.BeginThread) then
begin
InitHeap;
InitSystemThreads;
end;
SysInitExceptions;
{ setup fastmove stuff }
fpc_cpucodeinit;
initunicodestringmanager;
InitWin32Widestrings;
SysInitStdIO;
{ Arguments }
setup_arguments;
InitSystemDynLibs;
{ Reset IO Error }
InOutRes:=0;
ProcessID := GetCurrentProcessID;
DispCallByIDProc:=@DoDispCallByIDError;
finalization
WinFinalizeSystem;
end.
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