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wine/dlls/krnl386.exe16/task.c
Alexandre Julliard 1b2604384b krnl386.exe: Avoid using the CONTEXT86 type.
2010-10-20 18:37:09 +02:00

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/*
* Task functions
*
* Copyright 1995 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winnt.h"
#include "wownt32.h"
#include "winuser.h"
#include "wine/winbase16.h"
#include "winternl.h"
#include "kernel16_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(task);
#include "pshpack1.h"
struct thunk
{
BYTE movw;
HANDLE16 instance;
BYTE ljmp;
FARPROC16 func;
};
/* Segment containing MakeProcInstance() thunks */
typedef struct
{
WORD next; /* Selector of next segment */
WORD magic; /* Thunks signature */
WORD unused;
WORD free; /* Head of the free list */
struct thunk thunks[1];
} THUNKS;
#include "poppack.h"
#define THUNK_MAGIC ('P' | ('T' << 8))
/* Min. number of thunks allocated when creating a new segment */
#define MIN_THUNKS 32
#define TDB_MAGIC ('T' | ('D' << 8))
static THHOOK DefaultThhook;
THHOOK *pThhook = &DefaultThhook;
#define hFirstTask (pThhook->HeadTDB)
#define hLockedTask (pThhook->LockTDB)
static UINT16 nTaskCount = 0;
static HTASK16 initial_task, main_task;
/***********************************************************************
* TASK_InstallTHHook
*/
void TASK_InstallTHHook( THHOOK *pNewThhook )
{
THHOOK *pOldThhook = pThhook;
pThhook = pNewThhook? pNewThhook : &DefaultThhook;
*pThhook = *pOldThhook;
}
/***********************************************************************
* TASK_GetPtr
*/
static TDB *TASK_GetPtr( HTASK16 hTask )
{
return GlobalLock16( hTask );
}
/***********************************************************************
* TASK_GetCurrent
*/
TDB *TASK_GetCurrent(void)
{
return TASK_GetPtr( GetCurrentTask() );
}
/***********************************************************************
* TASK_LinkTask
*/
static void TASK_LinkTask( HTASK16 hTask )
{
HTASK16 *prevTask;
TDB *pTask;
if (!(pTask = TASK_GetPtr( hTask ))) return;
prevTask = &hFirstTask;
while (*prevTask)
{
TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
if (prevTaskPtr->priority >= pTask->priority) break;
prevTask = &prevTaskPtr->hNext;
}
pTask->hNext = *prevTask;
*prevTask = hTask;
nTaskCount++;
}
/***********************************************************************
* TASK_UnlinkTask
*/
static void TASK_UnlinkTask( HTASK16 hTask )
{
HTASK16 *prevTask;
TDB *pTask;
prevTask = &hFirstTask;
while (*prevTask && (*prevTask != hTask))
{
pTask = TASK_GetPtr( *prevTask );
prevTask = &pTask->hNext;
}
if (*prevTask)
{
pTask = TASK_GetPtr( *prevTask );
*prevTask = pTask->hNext;
pTask->hNext = 0;
nTaskCount--;
}
}
/***********************************************************************
* TASK_CreateThunks
*
* Create a thunk free-list in segment 'handle', starting from offset 'offset'
* and containing 'count' entries.
*/
static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
{
int i;
THUNKS *pThunk;
pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
pThunk->next = 0;
pThunk->magic = THUNK_MAGIC;
pThunk->free = FIELD_OFFSET( THUNKS, thunks );
for (i = 0; i < count-1; i++)
*(WORD *)&pThunk->thunks[i] = FIELD_OFFSET( THUNKS, thunks[i+1] );
*(WORD *)&pThunk->thunks[i] = 0; /* Last thunk */
}
/***********************************************************************
* TASK_AllocThunk
*
* Allocate a thunk for MakeProcInstance().
*/
static SEGPTR TASK_AllocThunk(void)
{
TDB *pTask;
THUNKS *pThunk;
WORD sel, base;
if (!(pTask = TASK_GetCurrent())) return 0;
sel = pTask->hCSAlias;
pThunk = (THUNKS *)pTask->thunks;
base = (char *)pThunk - (char *)pTask;
while (!pThunk->free)
{
sel = pThunk->next;
if (!sel) /* Allocate a new segment */
{
sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
pTask->hPDB, WINE_LDT_FLAGS_CODE );
if (!sel) return 0;
TASK_CreateThunks( sel, 0, MIN_THUNKS );
pThunk->next = sel;
}
pThunk = GlobalLock16( sel );
base = 0;
}
base += pThunk->free;
pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
return MAKESEGPTR( sel, base );
}
/***********************************************************************
* TASK_FreeThunk
*
* Free a MakeProcInstance() thunk.
*/
static BOOL TASK_FreeThunk( SEGPTR thunk )
{
TDB *pTask;
THUNKS *pThunk;
WORD sel, base;
if (!(pTask = TASK_GetCurrent())) return 0;
sel = pTask->hCSAlias;
pThunk = (THUNKS *)pTask->thunks;
base = (char *)pThunk - (char *)pTask;
while (sel && (sel != HIWORD(thunk)))
{
sel = pThunk->next;
pThunk = GlobalLock16( sel );
base = 0;
}
if (!sel) return FALSE;
*(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
pThunk->free = LOWORD(thunk) - base;
return TRUE;
}
/***********************************************************************
* TASK_Create
*
* NOTE: This routine might be called by a Win32 thread. Thus, we need
* to be careful to protect global data structures. We do this
* by entering the Win16Lock while linking the task into the
* global task list.
*/
static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
{
HTASK16 hTask;
TDB *pTask;
FARPROC16 proc;
char curdir[MAX_PATH];
HMODULE16 hModule = pModule ? pModule->self : 0;
/* Allocate the task structure */
hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
if (!hTask) return NULL;
pTask = TASK_GetPtr( hTask );
FarSetOwner16( hTask, hModule );
/* Fill the task structure */
pTask->hSelf = hTask;
pTask->version = pModule ? pModule->ne_expver : 0x0400;
pTask->hModule = hModule;
pTask->hParent = GetCurrentTask();
pTask->magic = TDB_MAGIC;
pTask->nCmdShow = cmdShow;
GetCurrentDirectoryA( sizeof(curdir), curdir );
GetShortPathNameA( curdir, curdir, sizeof(curdir) );
pTask->curdrive = (curdir[0] - 'A') | 0x80;
lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
/* Create the thunks block */
TASK_CreateThunks( hTask, (char *)pTask->thunks - (char *)pTask, 7 );
/* Copy the module name */
if (hModule)
{
char name[sizeof(pTask->module_name)+1];
size_t len;
GetModuleName16( hModule, name, sizeof(name) );
len = strlen(name) + 1;
memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
}
/* Allocate a selector for the PDB */
pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
hModule, WINE_LDT_FLAGS_DATA );
/* Fill the PDB */
pTask->pdb.int20 = 0x20cd;
pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
pTask->pdb.savedint22 = 0;
pTask->pdb.savedint23 = 0;
pTask->pdb.savedint24 = 0;
pTask->pdb.fileHandlesPtr =
MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), FIELD_OFFSET( PDB16, fileHandles ));
pTask->pdb.hFileHandles = 0;
memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
/* FIXME: should we make a copy of the environment? */
pTask->pdb.environment = SELECTOROF(GetDOSEnvironment16());
pTask->pdb.nbFiles = 20;
/* Fill the command line */
if (!cmdline)
{
cmdline = GetCommandLineA();
/* remove the first word (program name) */
if (*cmdline == '"')
if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
len = strlen(cmdline);
}
if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
pTask->pdb.cmdLine[0] = len;
memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
/* pTask->pdb.cmdLine[len+1] = 0; */
TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
/* Allocate a code segment alias for the TDB */
pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, pTask, sizeof(TDB),
pTask->hPDB, WINE_LDT_FLAGS_CODE );
/* Default DTA overwrites command line */
pTask->dta = MAKESEGPTR( pTask->hPDB, FIELD_OFFSET( PDB16, cmdLine ));
/* Create scheduler event for 16-bit tasks */
if ( !(pTask->flags & TDBF_WIN32) )
NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, NotificationEvent, FALSE );
if (!initial_task) initial_task = hTask;
return pTask;
}
/***********************************************************************
* TASK_DeleteTask
*/
static void TASK_DeleteTask( HTASK16 hTask )
{
TDB *pTask;
HGLOBAL16 hPDB;
if (!(pTask = TASK_GetPtr( hTask ))) return;
hPDB = pTask->hPDB;
pTask->magic = 0xdead; /* invalidate signature */
/* Free the selector aliases */
GLOBAL_FreeBlock( pTask->hCSAlias );
GLOBAL_FreeBlock( pTask->hPDB );
/* Free the task module */
FreeModule16( pTask->hModule );
/* Free the task structure itself */
GlobalFree16( hTask );
/* Free all memory used by this task (including the 32-bit stack, */
/* the environment block and the thunk segments). */
GlobalFreeAll16( hPDB );
}
/***********************************************************************
* TASK_CreateMainTask
*
* Create a task for the main (32-bit) process.
*/
void TASK_CreateMainTask(void)
{
TDB *pTask;
STARTUPINFOA startup_info;
UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
GetStartupInfoA( &startup_info );
if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
if (!pTask)
{
ERR("could not create task for main process\n");
ExitProcess(1);
}
pTask->flags |= TDBF_WIN32;
pTask->hInstance = 0;
pTask->hPrevInstance = 0;
pTask->teb = NtCurrentTeb();
/* Add the task to the linked list */
/* (no need to get the win16 lock, we are the only thread at this point) */
TASK_LinkTask( pTask->hSelf );
main_task = pTask->hSelf;
}
struct create_data
{
TDB *task;
WIN16_SUBSYSTEM_TIB *tib;
};
/* allocate the win16 TIB for a new 16-bit task */
static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
{
WCHAR path[MAX_PATH];
WIN16_SUBSYSTEM_TIB *tib;
UNICODE_STRING *curdir;
NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
GetLongPathNameW( path, path, MAX_PATH );
if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
else tib->exe_name = NULL;
RtlAcquirePebLock();
if (NtCurrentTeb()->Tib.SubSystemTib)
curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
else
curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
tib->curdir.DosPath.Buffer = tib->curdir_buffer;
tib->curdir.Handle = 0;
memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
RtlReleasePebLock();
return tib;
}
static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
{
if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
HeapFree( GetProcessHeap(), 0, tib );
}
/* startup routine for a new 16-bit thread */
static DWORD CALLBACK task_start( LPVOID p )
{
struct create_data *data = p;
TDB *pTask = data->task;
DWORD ret;
kernel_get_thread_data()->htask16 = pTask->hSelf;
NtCurrentTeb()->Tib.SubSystemTib = data->tib;
HeapFree( GetProcessHeap(), 0, data );
_EnterWin16Lock();
TASK_LinkTask( pTask->hSelf );
pTask->teb = NtCurrentTeb();
ret = NE_StartTask();
_LeaveWin16Lock();
return ret;
}
/***********************************************************************
* TASK_SpawnTask
*
* Spawn a new 16-bit task.
*/
HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
LPCSTR cmdline, BYTE len, HANDLE *hThread )
{
struct create_data *data = NULL;
WIN16_SUBSYSTEM_TIB *tib;
TDB *pTask;
if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
if (!(tib = allocate_win16_tib( pTask ))) goto failed;
if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
data->task = pTask;
data->tib = tib;
if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
return pTask->hSelf;
failed:
if (tib) free_win16_tib( tib );
HeapFree( GetProcessHeap(), 0, data );
TASK_DeleteTask( pTask->hSelf );
return 0;
}
/***********************************************************************
* TASK_GetTaskFromThread
*/
HTASK16 TASK_GetTaskFromThread( DWORD thread )
{
TDB *p = TASK_GetPtr( hFirstTask );
while (p)
{
if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
p = TASK_GetPtr( p->hNext );
}
return 0;
}
/***********************************************************************
* TASK_CallTaskSignalProc
*/
static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
{
WORD args[5];
TDB *pTask = TASK_GetCurrent();
if ( !pTask || !pTask->userhandler ) return;
args[4] = hTaskOrModule;
args[3] = uCode;
args[2] = 0;
args[1] = pTask->hInstance;
args[0] = pTask->hQueue;
WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
}
/***********************************************************************
* TASK_ExitTask
*/
void TASK_ExitTask(void)
{
WIN16_SUBSYSTEM_TIB *tib;
TDB *pTask;
DWORD lockCount;
/* Enter the Win16Lock to protect global data structures */
_EnterWin16Lock();
pTask = TASK_GetCurrent();
if ( !pTask )
{
_LeaveWin16Lock();
return;
}
TRACE("Killing task %04x\n", pTask->hSelf );
/* Perform USER cleanup */
TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
/* Remove the task from the list to be sure we never switch back to it */
TASK_UnlinkTask( pTask->hSelf );
if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
{
TRACE("this is the last task, exiting\n" );
ExitKernel16();
}
pTask->nEvents = 0;
if ( hLockedTask == pTask->hSelf )
hLockedTask = 0;
TASK_DeleteTask( pTask->hSelf );
if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
{
free_win16_tib( tib );
NtCurrentTeb()->Tib.SubSystemTib = NULL;
}
/* ... and completely release the Win16Lock, just in case. */
ReleaseThunkLock( &lockCount );
}
/***********************************************************************
* ExitKernel (KERNEL.2)
*
* Clean-up everything and exit the Wine process.
*/
void WINAPI ExitKernel16(void)
{
WriteOutProfiles16();
TerminateProcess( GetCurrentProcess(), 0 );
}
/***********************************************************************
* InitTask (KERNEL.91)
*
* Called by the application startup code.
*/
void WINAPI InitTask16( CONTEXT *context )
{
TDB *pTask;
INSTANCEDATA *pinstance;
SEGPTR ptr;
context->Eax = 0;
if (!(pTask = TASK_GetCurrent())) return;
/* Note: we need to trust that BX/CX contain the stack/heap sizes,
as some apps, notably Visual Basic apps, *modify* the heap/stack
size of the instance data segment before calling InitTask() */
/* Initialize the INSTANCEDATA structure */
pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
pinstance->stackmin = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
pinstance->stacktop = ( pinstance->stackmin > LOWORD(context->Ebx) ?
pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
/* Initialize the local heap */
if (LOWORD(context->Ecx))
LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
/* Initialize implicitly loaded DLLs */
NE_InitializeDLLs( pTask->hModule );
NE_DllProcessAttach( pTask->hModule );
/* Registers on return are:
* ax 1 if OK, 0 on error
* cx stack limit in bytes
* dx cmdShow parameter
* si instance handle of the previous instance
* di instance handle of the new task
* es:bx pointer to command line inside PSP
*
* 0 (=%bp) is pushed on the stack
*/
ptr = stack16_push( sizeof(WORD) );
*(WORD *)MapSL(ptr) = 0;
context->Esp -= 2;
context->Eax = 1;
if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
else
{
LPBYTE p = &pTask->pdb.cmdLine[1];
while ((*p == ' ') || (*p == '\t')) p++;
context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
}
context->Ecx = pinstance->stacktop;
context->Edx = pTask->nCmdShow;
context->Esi = (DWORD)pTask->hPrevInstance;
context->Edi = (DWORD)pTask->hInstance;
context->SegEs = (WORD)pTask->hPDB;
}
/***********************************************************************
* WaitEvent (KERNEL.30)
*/
BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
pTask = TASK_GetPtr( hTask );
if (pTask->flags & TDBF_WIN32)
{
FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
return TRUE;
}
if (pTask->nEvents > 0)
{
pTask->nEvents--;
return FALSE;
}
if (pTask->teb == NtCurrentTeb())
{
DWORD lockCount;
NtResetEvent( pTask->hEvent, NULL );
ReleaseThunkLock( &lockCount );
SYSLEVEL_CheckNotLevel( 1 );
WaitForSingleObject( pTask->hEvent, INFINITE );
RestoreThunkLock( lockCount );
if (pTask->nEvents > 0) pTask->nEvents--;
}
else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
return TRUE;
}
/***********************************************************************
* PostEvent (KERNEL.31)
*/
void WINAPI PostEvent16( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = TASK_GetPtr( hTask ))) return;
if (pTask->flags & TDBF_WIN32)
{
FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
return;
}
pTask->nEvents++;
if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
}
/***********************************************************************
* SetPriority (KERNEL.32)
*/
void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
{
TDB *pTask;
INT16 newpriority;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = TASK_GetPtr( hTask ))) return;
newpriority = pTask->priority + delta;
if (newpriority < -32) newpriority = -32;
else if (newpriority > 15) newpriority = 15;
pTask->priority = newpriority + 1;
TASK_UnlinkTask( pTask->hSelf );
TASK_LinkTask( pTask->hSelf );
pTask->priority--;
}
/***********************************************************************
* LockCurrentTask (KERNEL.33)
*/
HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
{
if (bLock) hLockedTask = GetCurrentTask();
else hLockedTask = 0;
return hLockedTask;
}
/***********************************************************************
* IsTaskLocked (KERNEL.122)
*/
HTASK16 WINAPI IsTaskLocked16(void)
{
return hLockedTask;
}
/***********************************************************************
* OldYield (KERNEL.117)
*/
void WINAPI OldYield16(void)
{
DWORD count;
ReleaseThunkLock(&count);
RestoreThunkLock(count);
}
/***********************************************************************
* WIN32_OldYield (KERNEL.447)
*/
void WINAPI WIN32_OldYield16(void)
{
DWORD count;
ReleaseThunkLock(&count);
RestoreThunkLock(count);
}
/***********************************************************************
* DirectedYield (KERNEL.150)
*/
void WINAPI DirectedYield16( HTASK16 hTask )
{
OldYield16();
}
/***********************************************************************
* Yield (KERNEL.29)
*/
void WINAPI Yield16(void)
{
TDB *pCurTask = TASK_GetCurrent();
if (pCurTask && pCurTask->hQueue)
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
if (mod)
{
BOOL (WINAPI *pPeekMessageW)( MSG *msg, HWND hwnd, UINT first, UINT last, UINT flags );
pPeekMessageW = (void *)GetProcAddress( mod, "PeekMessageW" );
if (pPeekMessageW)
{
MSG msg;
pPeekMessageW( &msg, 0, 0, 0, PM_REMOVE | PM_QS_SENDMESSAGE );
return;
}
}
}
OldYield16();
}
/***********************************************************************
* KERNEL_490 (KERNEL.490)
*/
HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
{
if ( !someTask ) return 0;
FIXME("(%04x): stub\n", someTask );
return 0;
}
/***********************************************************************
* MakeProcInstance (KERNEL.51)
*/
FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
{
struct thunk *thunk;
BYTE *lfunc;
SEGPTR thunkaddr;
WORD hInstanceSelector;
hInstanceSelector = GlobalHandleToSel16(hInstance);
TRACE("(%p, %04x);\n", func, hInstance);
if (!HIWORD(func)) {
/* Win95 actually protects via SEH, but this is better for debugging */
WARN("Ouch ! Called with invalid func %p !\n", func);
return NULL;
}
if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
&& (hInstance != 0)
&& (hInstance != 0xffff) )
{
/* calling MPI with a foreign DSEG is invalid ! */
WARN("Problem with hInstance? Got %04x, using %04x instead\n",
hInstance,CURRENT_DS);
}
/* Always use the DSEG that MPI was entered with.
* We used to set hInstance to GetTaskDS16(), but this should be wrong
* as CURRENT_DS provides the DSEG value we need.
* ("calling" DS, *not* "task" DS !) */
hInstanceSelector = CURRENT_DS;
hInstance = GlobalHandle16(hInstanceSelector);
/* no thunking for DLLs */
if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
return func;
thunkaddr = TASK_AllocThunk();
if (!thunkaddr) return NULL;
thunk = MapSL( thunkaddr );
lfunc = MapSL( (SEGPTR)func );
TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
((lfunc[0]==0x1e) && (lfunc[1]==0x58)) /* pushw %ds, popw %ax */
) {
WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
}
thunk->movw = 0xb8; /* movw instance, %ax */
thunk->instance = hInstanceSelector;
thunk->ljmp = 0xea; /* ljmp func */
thunk->func = func;
return (FARPROC16)thunkaddr;
/* CX reg indicates if thunkaddr != NULL, implement if needed */
}
/***********************************************************************
* FreeProcInstance (KERNEL.52)
*/
void WINAPI FreeProcInstance16( FARPROC16 func )
{
TRACE("(%p)\n", func );
TASK_FreeThunk( (SEGPTR)func );
}
/**********************************************************************
* TASK_GetCodeSegment
*
* Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
* and logical segment number of a given code segment.
*
* 'proc' either *is* already a pair of module handle and segment number,
* in which case there's nothing to do. Otherwise, it is a pointer to
* a function, and we need to retrieve the code segment. If the pointer
* happens to point to a thunk, we'll retrieve info about the code segment
* where the function pointed to by the thunk resides, not the thunk itself.
*
* FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
* the function the snoop code will return to ...
*
*/
static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
SEGTABLEENTRY **ppSeg, int *pSegNr )
{
NE_MODULE *pModule = NULL;
SEGTABLEENTRY *pSeg = NULL;
int segNr=0;
/* Try pair of module handle / segment number */
pModule = GlobalLock16( HIWORD( proc ) );
if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
{
segNr = LOWORD( proc );
if ( segNr && segNr <= pModule->ne_cseg )
pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
}
/* Try thunk or function */
else
{
BYTE *thunk = MapSL( (SEGPTR)proc );
WORD selector;
if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
selector = thunk[6] + (thunk[7] << 8);
else
selector = HIWORD( proc );
pModule = NE_GetPtr( GlobalHandle16( selector ) );
pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
if ( pModule )
for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
break;
if ( pModule && segNr > pModule->ne_cseg )
pSeg = NULL;
}
/* Abort if segment not found */
if ( !pModule || !pSeg )
return FALSE;
/* Return segment data */
if ( ppModule ) *ppModule = pModule;
if ( ppSeg ) *ppSeg = pSeg;
if ( pSegNr ) *pSegNr = segNr;
return TRUE;
}
/**********************************************************************
* GetCodeHandle (KERNEL.93)
*/
HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
{
SEGTABLEENTRY *pSeg;
if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
return 0;
return pSeg->hSeg;
}
/**********************************************************************
* GetCodeInfo (KERNEL.104)
*/
BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
{
NE_MODULE *pModule;
SEGTABLEENTRY *pSeg;
int segNr;
if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
return FALSE;
/* Fill in segment information */
segInfo->offSegment = pSeg->filepos;
segInfo->cbSegment = pSeg->size;
segInfo->flags = pSeg->flags;
segInfo->cbAlloc = pSeg->minsize;
segInfo->h = pSeg->hSeg;
segInfo->alignShift = pModule->ne_align;
if ( segNr == pModule->ne_autodata )
segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
/* Return module handle in %es */
CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
return TRUE;
}
/**********************************************************************
* DefineHandleTable (KERNEL.94)
*/
BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
{
FIXME("(%04x): stub ?\n", wOffset);
return TRUE;
}
/***********************************************************************
* SetTaskQueue (KERNEL.34)
*/
HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
{
FIXME( "stub, should not get called\n" );
return 0xbeef;
}
/***********************************************************************
* GetTaskQueue (KERNEL.35)
*/
HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
{
FIXME( "stub, should not get called\n" );
return 0xbeef;
}
/***********************************************************************
* SetThreadQueue (KERNEL.463)
*/
HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
{
FIXME( "stub, should not get called\n" );
return 0xbeef;
}
/***********************************************************************
* GetThreadQueue (KERNEL.464)
*/
HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
{
FIXME( "stub, should not get called\n" );
return 0xbeef;
}
/***********************************************************************
* SetFastQueue (KERNEL.624)
*/
VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
{
FIXME( "stub, should not get called\n" );
}
/***********************************************************************
* GetFastQueue (KERNEL.625)
*/
HQUEUE16 WINAPI GetFastQueue16( void )
{
FIXME( "stub, should not get called\n" );
return 0xbeef;
}
/***********************************************************************
* SwitchStackTo (KERNEL.108)
*/
void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
{
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
UINT16 copySize;
if (!(pData = GlobalLock16( seg ))) return;
TRACE("old=%04x:%04x new=%04x:%04x\n",
SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
/* Save the old stack */
oldFrame = CURRENT_STACK16;
/* pop frame + args and push bp */
pData->old_ss_sp = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
+ 2 * sizeof(WORD);
*(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
pData->stacktop = top;
pData->stackmin = ptr;
pData->stackbottom = ptr;
/* Switch to the new stack */
/* Note: we need to take the 3 arguments into account; otherwise,
* the stack will underflow upon return from this function.
*/
copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
newFrame = CURRENT_STACK16;
/* Copy the stack frame and the local variables to the new stack */
memmove( newFrame, oldFrame, copySize );
newFrame->bp = ptr;
*(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0; /* clear previous bp */
}
/***********************************************************************
* SwitchStackBack (KERNEL.109)
*/
void WINAPI SwitchStackBack16( CONTEXT *context )
{
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
if (!(pData = GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
return;
if (!pData->old_ss_sp)
{
WARN("No previous SwitchStackTo\n" );
return;
}
TRACE("restoring stack %04x:%04x\n",
SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
oldFrame = CURRENT_STACK16;
/* Pop bp from the previous stack */
context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
pData->old_ss_sp += sizeof(WORD);
/* Switch back to the old stack */
NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
context->SegSs = SELECTOROF(pData->old_ss_sp);
context->Esp = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
pData->old_ss_sp = 0;
/* Build a stack frame for the return */
newFrame = CURRENT_STACK16;
newFrame->frame32 = oldFrame->frame32;
newFrame->module_cs = oldFrame->module_cs;
newFrame->callfrom_ip = oldFrame->callfrom_ip;
newFrame->entry_ip = oldFrame->entry_ip;
}
/***********************************************************************
* GetTaskQueueDS (KERNEL.118)
*/
void WINAPI GetTaskQueueDS16(void)
{
CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
}
/***********************************************************************
* GetTaskQueueES (KERNEL.119)
*/
void WINAPI GetTaskQueueES16(void)
{
CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
}
/***********************************************************************
* GetCurrentTask (KERNEL32.@)
*/
HTASK16 WINAPI GetCurrentTask(void)
{
HTASK16 ret = kernel_get_thread_data()->htask16;
if (!ret) ret = main_task;
return ret;
}
/***********************************************************************
* GetCurrentTask (KERNEL.36)
*/
DWORD WINAPI WIN16_GetCurrentTask(void)
{
/* This is the version used by relay code; the first task is */
/* returned in the high word of the result */
return MAKELONG( GetCurrentTask(), hFirstTask );
}
/***********************************************************************
* GetCurrentPDB (KERNEL.37)
*
* UNDOC: returns PSP of KERNEL in high word
*/
DWORD WINAPI GetCurrentPDB16(void)
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return 0;
return MAKELONG(pTask->hPDB, 0); /* FIXME */
}
/***********************************************************************
* GetCurPID (KERNEL.157)
*/
DWORD WINAPI GetCurPID16( DWORD unused )
{
return 0;
}
/***********************************************************************
* GetInstanceData (KERNEL.54)
*/
INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
{
char *ptr = GlobalLock16( instance );
if (!ptr || !len) return 0;
if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
return len;
}
/***********************************************************************
* GetExeVersion (KERNEL.105)
*/
WORD WINAPI GetExeVersion16(void)
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return 0;
return pTask->version;
}
/***********************************************************************
* SetErrorMode (KERNEL.107)
*/
UINT16 WINAPI SetErrorMode16( UINT16 mode )
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return 0;
pTask->error_mode = mode;
return SetErrorMode( mode );
}
/***********************************************************************
* GetNumTasks (KERNEL.152)
*/
UINT16 WINAPI GetNumTasks16(void)
{
return nTaskCount;
}
/***********************************************************************
* GetTaskDS (KERNEL.155)
*
* Note: this function apparently returns a DWORD with LOWORD == HIWORD.
* I don't think we need to bother with this.
*/
HINSTANCE16 WINAPI GetTaskDS16(void)
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return 0;
return GlobalHandleToSel16(pTask->hInstance);
}
/***********************************************************************
* GetDummyModuleHandleDS (KERNEL.602)
*/
WORD WINAPI GetDummyModuleHandleDS16(void)
{
TDB *pTask;
WORD selector;
if (!(pTask = TASK_GetCurrent())) return 0;
if (!(pTask->flags & TDBF_WIN32)) return 0;
selector = GlobalHandleToSel16( pTask->hModule );
CURRENT_DS = selector;
return selector;
}
/***********************************************************************
* IsTask (KERNEL.320)
*/
BOOL16 WINAPI IsTask16( HTASK16 hTask )
{
TDB *pTask;
if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
return (pTask->magic == TDB_MAGIC);
}
/***********************************************************************
* IsWinOldApTask (KERNEL.158)
*/
BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
{
/* should return bit 0 of byte 0x48 in PSP */
return FALSE;
}
/***********************************************************************
* SetTaskSignalProc (KERNEL.38)
*/
FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
{
TDB *pTask;
FARPROC16 oldProc;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
oldProc = pTask->userhandler;
pTask->userhandler = proc;
return oldProc;
}
/***********************************************************************
* SetSigHandler (KERNEL.140)
*/
WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
UINT16 *oldmode, UINT16 newmode, UINT16 flag )
{
FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
newhandler,oldhandler,oldmode,newmode,flag );
if (flag != 1) return 0;
if (!newmode) newhandler = NULL; /* Default handler */
if (newmode != 4)
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return 0;
if (oldmode) *oldmode = pTask->signal_flags;
pTask->signal_flags = newmode;
if (oldhandler) *oldhandler = pTask->sighandler;
pTask->sighandler = newhandler;
}
return 0;
}
/***********************************************************************
* GlobalNotify (KERNEL.154)
*
* Note that GlobalNotify does _not_ return the old NotifyProc
* -- contrary to LocalNotify !!
*/
VOID WINAPI GlobalNotify16( FARPROC16 proc )
{
TDB *pTask;
if (!(pTask = TASK_GetCurrent())) return;
pTask->discardhandler = proc;
}
/***********************************************************************
* GetExePtrHelper
*/
static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
{
char *ptr;
HANDLE16 owner;
/* Check for module handle */
if (!(ptr = GlobalLock16( handle ))) return 0;
if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
/* Search for this handle inside all tasks */
*hTask = hFirstTask;
while (*hTask)
{
TDB *pTask = TASK_GetPtr( *hTask );
if ((*hTask == handle) ||
(pTask->hInstance == handle) ||
(pTask->hQueue == handle) ||
(pTask->hPDB == handle)) return pTask->hModule;
*hTask = pTask->hNext;
}
/* Check the owner for module handle */
owner = FarGetOwner16( handle );
if (!(ptr = GlobalLock16( owner ))) return 0;
if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
/* Search for the owner inside all tasks */
*hTask = hFirstTask;
while (*hTask)
{
TDB *pTask = TASK_GetPtr( *hTask );
if ((*hTask == owner) ||
(pTask->hInstance == owner) ||
(pTask->hQueue == owner) ||
(pTask->hPDB == owner)) return pTask->hModule;
*hTask = pTask->hNext;
}
return 0;
}
/***********************************************************************
* GetExePtr (KERNEL.133)
*/
HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
{
HTASK16 hTask = 0;
HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
STACK16FRAME *frame = CURRENT_STACK16;
frame->ecx = hModule;
if (hTask) frame->es = hTask;
return hModule;
}
/***********************************************************************
* K228 (KERNEL.228)
*/
HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
{
HTASK16 hTask = 0;
return GetExePtrHelper( handle, &hTask );
}
typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
/**************************************************************************
* FatalAppExit (KERNEL.137)
*/
void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
{
TDB *pTask = TASK_GetCurrent();
if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
{
HMODULE mod = GetModuleHandleA( "user32.dll" );
if (mod)
{
MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
if (pMessageBoxA)
{
pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
goto done;
}
}
ERR( "%s\n", debugstr_a(str) );
}
done:
ExitThread(0xff);
}
/***********************************************************************
* GetAppCompatFlags (KERNEL.354)
*/
DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask=TASK_GetPtr( hTask ))) return 0;
if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
return pTask->compat_flags;
}
/***********************************************************************
* GetDOSEnvironment (KERNEL.131)
*
* Note: the environment is allocated once, it doesn't track changes
* made using the Win32 API. This shouldn't matter.
*
* Format of a 16-bit environment block:
* ASCIIZ string 1 (xx=yy format)
* ...
* ASCIIZ string n
* BYTE 0
* WORD 1
* ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
*/
SEGPTR WINAPI GetDOSEnvironment16(void)
{
static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
static HGLOBAL16 handle; /* handle to the 16 bit environment */
if (!handle)
{
DWORD size;
LPSTR p, env;
p = env = GetEnvironmentStringsA();
while (*p) p += strlen(p) + 1;
p++; /* skip last null */
size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
handle = GlobalAlloc16( GMEM_FIXED, size );
if (handle)
{
WORD one = 1;
LPSTR env16 = GlobalLock16( handle );
memcpy( env16, env, p - env );
memcpy( env16 + (p - env), &one, sizeof(one));
memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
GlobalUnlock16( handle );
}
FreeEnvironmentStringsA( env );
}
return WOWGlobalLock16( handle );
}
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