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goma / wine / 54c2711ff6326488520f1a7e68414601ec353dc0 / . / loader / task.c
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/*
* Task functions
*
* Copyright 1995 Alexandre Julliard
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "windows.h"
#include "user.h"
#include "callback.h"
#include "drive.h"
#include "file.h"
#include "global.h"
#include "instance.h"
#include "message.h"
#include "miscemu.h"
#include "module.h"
#include "neexe.h"
#include "peexe.h"
#include "pe_image.h"
#include "process.h"
#include "queue.h"
#include "selectors.h"
#include "stackframe.h"
#include "thread.h"
#include "toolhelp.h"
#include "winnt.h"
#include "thread.h"
#include "debug.h"
#include "dde_proc.h"
/* Min. number of thunks allocated when creating a new segment */
#define MIN_THUNKS 32
extern INT32 WINSOCK_DeleteTaskWSI( TDB* pTask, struct _WSINFO* );
extern BOOL32 MODULE_FreeModule( HMODULE16 hModule, TDB* ptaskContext );
/* Pointer to function to switch to a larger stack */
int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL;
static HTASK16 hFirstTask = 0;
static HTASK16 hCurrentTask = 0;
static HTASK16 hTaskToKill = 0;
static HTASK16 hLockedTask = 0;
static UINT16 nTaskCount = 0;
static HGLOBAL16 hDOSEnvironment = 0;
static HGLOBAL16 TASK_CreateDOSEnvironment(void);
static void TASK_YieldToSystem(TDB*);
/***********************************************************************
* TASK_Init
*/
BOOL32 TASK_Init(void)
{
if (!(hDOSEnvironment = TASK_CreateDOSEnvironment()))
fprintf( stderr, "Not enough memory for DOS Environment\n" );
return (hDOSEnvironment != 0);
}
/***********************************************************************
* TASK_GetNextTask
*/
HTASK16 TASK_GetNextTask( HTASK16 hTask )
{
TDB* pTask = (TDB*)GlobalLock16(hTask);
if (pTask->hNext) return pTask->hNext;
return (hFirstTask != hTask) ? hFirstTask : 0;
}
/***********************************************************************
* TASK_CreateDOSEnvironment
*
* Create the original DOS environment.
*/
static HGLOBAL16 TASK_CreateDOSEnvironment(void)
{
static const char program_name[] = "KRNL386.EXE";
char **e, *p;
int initial_size, size, i, winpathlen, sysdirlen;
HGLOBAL16 handle;
extern char **environ;
/* DOS environment format:
* ASCIIZ string 1
* ASCIIZ string 2
* ...
* ASCIIZ string n
* ASCIIZ PATH=xxx
* BYTE 0
* WORD 1
* ASCIIZ program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
*/
/* First compute the size of the fixed part of the environment */
for (i = winpathlen = 0; ; i++)
{
int len = DIR_GetDosPath( i, NULL, 0 );
if (!len) break;
winpathlen += len + 1;
}
if (!winpathlen) winpathlen = 1;
sysdirlen = GetSystemDirectory32A( NULL, 0 ) + 1;
initial_size = 5 + winpathlen + /* PATH=xxxx */
1 + /* BYTE 0 at end */
sizeof(WORD) + /* WORD 1 */
sysdirlen + /* program directory */
strlen(program_name) + 1; /* program name */
/* Compute the total size of the Unix environment (except path) */
for (e = environ, size = initial_size; *e; e++)
{
if (lstrncmpi32A(*e, "path=", 5))
{
int len = strlen(*e) + 1;
if (size + len >= 32767)
{
fprintf( stderr, "Warning: environment larger than 32k.\n" );
break;
}
size += len;
}
}
/* Now allocate the environment */
if (!(handle = GlobalAlloc16( GMEM_FIXED, size ))) return 0;
p = (char *)GlobalLock16( handle );
/* And fill it with the Unix environment */
for (e = environ, size = initial_size; *e; e++)
{
if (lstrncmpi32A(*e, "path=", 5))
{
int len = strlen(*e) + 1;
if (size + len >= 32767) break;
strcpy( p, *e );
size += len;
p += len;
}
}
/* Now add the path */
strcpy( p, "PATH=" );
for (i = 0, p += 5; ; i++)
{
if (!DIR_GetDosPath( i, p, winpathlen )) break;
p += strlen(p);
*p++ = ';';
}
if (p[-1] == ';') p[-1] = '\0';
else p++;
/* Now add the program name */
*p++ = '\0';
PUT_WORD( p, 1 );
p += sizeof(WORD);
GetSystemDirectory32A( p, sysdirlen );
strcat( p, "\\" );
strcat( p, program_name );
/* Display it */
p = (char *) GlobalLock16( handle );
TRACE(task, "Master DOS environment at %p\n", p);
for (; *p; p += strlen(p) + 1) TRACE(task, " %s\n", p);
TRACE(task, "Progname: %s\n", p+3 );
return handle;
}
/***********************************************************************
* TASK_LinkTask
*/
static void TASK_LinkTask( HTASK16 hTask )
{
HTASK16 *prevTask;
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
prevTask = &hFirstTask;
while (*prevTask)
{
TDB *prevTaskPtr = (TDB *)GlobalLock16( *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 = (TDB *)GlobalLock16( *prevTask );
prevTask = &pTask->hNext;
}
if (*prevTask)
{
pTask = (TDB *)GlobalLock16( *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;
WORD free;
THUNKS *pThunk;
pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
pThunk->next = 0;
pThunk->magic = THUNK_MAGIC;
pThunk->free = (int)&pThunk->thunks - (int)pThunk;
free = pThunk->free;
for (i = 0; i < count-1; i++)
{
free += 8; /* Offset of next thunk */
pThunk->thunks[4*i] = free;
}
pThunk->thunks[4*i] = 0; /* Last thunk */
}
/***********************************************************************
* TASK_AllocThunk
*
* Allocate a thunk for MakeProcInstance().
*/
static SEGPTR TASK_AllocThunk( HTASK16 hTask )
{
TDB *pTask;
THUNKS *pThunk;
WORD sel, base;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
sel = pTask->hCSAlias;
pThunk = &pTask->thunks;
base = (int)pThunk - (int)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, TRUE, FALSE, FALSE );
if (!sel) return (SEGPTR)0;
TASK_CreateThunks( sel, 0, MIN_THUNKS );
pThunk->next = sel;
}
pThunk = (THUNKS *)GlobalLock16( sel );
base = 0;
}
base += pThunk->free;
pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
return PTR_SEG_OFF_TO_SEGPTR( sel, base );
}
/***********************************************************************
* TASK_FreeThunk
*
* Free a MakeProcInstance() thunk.
*/
static BOOL32 TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
{
TDB *pTask;
THUNKS *pThunk;
WORD sel, base;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
sel = pTask->hCSAlias;
pThunk = &pTask->thunks;
base = (int)pThunk - (int)pTask;
while (sel && (sel != HIWORD(thunk)))
{
sel = pThunk->next;
pThunk = (THUNKS *)GlobalLock16( sel );
base = 0;
}
if (!sel) return FALSE;
*(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
pThunk->free = LOWORD(thunk) - base;
return TRUE;
}
/***********************************************************************
* TASK_CallToStart
*
* 32-bit entry point for a new task. This function is responsible for
* setting up the registers and jumping to the 16-bit entry point.
*/
static void TASK_CallToStart(void)
{
int exit_code = 1;
TDB *pTask = (TDB *)GlobalLock16( hCurrentTask );
NE_MODULE *pModule = MODULE_GetPtr( pTask->hModule );
SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
SET_CUR_THREAD( pTask->thdb );
/* Terminate the stack frame */
THREAD_STACK16(pTask->thdb)->frame32 = NULL;
if (pModule->flags & NE_FFLAGS_WIN32)
{
/* FIXME: all this is an ugly hack */
FARPROC32 entry = (FARPROC32)RVA_PTR( PROCESS_Current()->exe_modref->module, OptionalHeader.AddressOfEntryPoint );
pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
if (pModule->heap_size)
LocalInit( pTask->hInstance, 0, pModule->heap_size );
InitApp( pTask->hModule );
PE_InitializeDLLs( PROCESS_Current(), DLL_PROCESS_ATTACH, (LPVOID)-1 );
TRACE(relay, "(entryproc=%p)\n", entry );
exit_code = entry();
TASK_KillCurrentTask( exit_code );
}
else
{
/* Registers at initialization must be:
* ax zero
* bx stack size in bytes
* cx heap size in bytes
* si previous app instance
* di current app instance
* bp zero
* es selector to the PSP
* ds dgroup of the application
* ss stack selector
* sp top of the stack
*/
CONTEXT context;
memset( &context, 0, sizeof(context) );
CS_reg(&context) = pSegTable[pModule->cs - 1].selector;
DS_reg(&context) = pSegTable[pModule->dgroup - 1].selector;
ES_reg(&context) = pTask->hPDB;
EIP_reg(&context) = pModule->ip;
EBX_reg(&context) = pModule->stack_size;
ECX_reg(&context) = pModule->heap_size;
EDI_reg(&context) = context.SegDs;
TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
CS_reg(&context), IP_reg(&context), DS_reg(&context),
SELECTOROF(pTask->thdb->cur_stack),
OFFSETOF(pTask->thdb->cur_stack) );
Callbacks->CallRegisterShortProc( &context, 0 );
/* This should never return */
fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
TASK_KillCurrentTask( 1 );
}
}
/***********************************************************************
* TASK_CreateTask
*/
HTASK16 TASK_CreateTask( HMODULE16 hModule, HINSTANCE16 hInstance,
HINSTANCE16 hPrevInstance, HANDLE16 hEnvironment,
LPCSTR cmdLine, UINT16 cmdShow )
{
HTASK16 hTask;
TDB *pTask;
PDB32 *pdb32;
HGLOBAL16 hParentEnv;
NE_MODULE *pModule;
SEGTABLEENTRY *pSegTable;
LPSTR name;
WORD sp;
char *stack32Top;
STACK16FRAME *frame16;
STACK32FRAME *frame32;
if (!(pModule = MODULE_GetPtr( hModule ))) return 0;
pSegTable = NE_SEG_TABLE( pModule );
/* Allocate the task structure */
hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
hModule, FALSE, FALSE, FALSE );
if (!hTask) return 0;
pTask = (TDB *)GlobalLock16( hTask );
/* Allocate the new environment block */
if (!(hParentEnv = hEnvironment))
{
TDB *pParent = (TDB *)GlobalLock16( hCurrentTask );
hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment;
}
/* FIXME: do we really need to make a copy also when */
/* we don't use the parent environment? */
if (!(hEnvironment = GlobalAlloc16( GMEM_FIXED, GlobalSize16(hParentEnv))))
{
GlobalFree16( hTask );
return 0;
}
memcpy( GlobalLock16( hEnvironment ), GlobalLock16( hParentEnv ),
GlobalSize16( hParentEnv ) );
/* Fill the task structure */
pTask->nEvents = 1; /* So the task can be started */
pTask->hSelf = hTask;
pTask->flags = 0;
if (pModule->flags & NE_FFLAGS_WIN32)
pTask->flags |= TDBF_WIN32;
pTask->version = pModule->expected_version;
pTask->hInstance = hInstance;
pTask->hPrevInstance = hPrevInstance;
pTask->hModule = hModule;
pTask->hParent = hCurrentTask;
pTask->magic = TDB_MAGIC;
pTask->nCmdShow = cmdShow;
pTask->curdrive = DRIVE_GetCurrentDrive() | 0x80;
strcpy( pTask->curdir, "\\" );
lstrcpyn32A( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
sizeof(pTask->curdir) - 1 );
/* Create the thunks block */
TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
/* Copy the module name */
name = MODULE_GetModuleName( hModule );
strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
/* Allocate a selector for the PDB */
pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
hModule, FALSE, FALSE, FALSE, NULL );
/* Fill the PDB */
pTask->pdb.int20 = 0x20cd;
pTask->pdb.dispatcher[0] = 0x9a; /* ljmp */
PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)MODULE_GetEntryPoint(
GetModuleHandle16("KERNEL"), 102 )); /* KERNEL.102 is DOS3Call() */
pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
pTask->pdb.fileHandlesPtr =
PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
(int)&((PDB *)0)->fileHandles );
pTask->pdb.hFileHandles = 0;
memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
pTask->pdb.environment = hEnvironment;
pTask->pdb.nbFiles = 20;
lstrcpyn32A( pTask->pdb.cmdLine, cmdLine, sizeof(pTask->pdb.cmdLine) );
/* Get the compatibility flags */
pTask->compat_flags = GetProfileInt32A( "Compatibility", name, 0 );
/* Allocate a code segment alias for the TDB */
pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
sizeof(TDB), pTask->hPDB, TRUE,
FALSE, FALSE, NULL );
/* Set the owner of the environment block */
FarSetOwner( pTask->pdb.environment, pTask->hPDB );
/* Default DTA overwrites command-line */
pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
(int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
/* Create the Win32 part of the task */
pdb32 = PROCESS_Create( pTask, cmdLine );
/* FIXME: check for pdb32 == NULL. */
pdb32->task = hTask;
if (pModule->flags & NE_FFLAGS_WIN32)
{
/*
LPTHREAD_START_ROUTINE start =
(LPTHREAD_START_ROUTINE)(
PROCESS_Current()->exe_modref->load_addr +
PROCESS_Current()->exe_modref->pe_module->pe_header->OptionalHeader.AddressOfEntryPoint);
*/
pTask->thdb = THREAD_Create( pdb32,
PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve,
NULL, NULL );
}
else
pTask->thdb = THREAD_Create( pdb32, 0, NULL, NULL );
/* FIXME: check for pTask->thdb == NULL. */
/* Create the 16-bit stack frame */
if (!(sp = pModule->sp))
sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
sp &= ~1;
pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( hInstance, sp );
pTask->thdb->cur_stack -= sizeof(STACK16FRAME) + sizeof(STACK32FRAME *);
frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
frame16->bp = LOWORD(frame16->ebp);
frame16->ds = frame16->es = pTask->hInstance;
frame16->entry_point = 0;
frame16->entry_cs = 0;
/* The remaining fields will be initialized in TASK_Reschedule */
/* Create the 32-bit stack frame */
stack32Top = (char*)pTask->thdb->teb.stack_top;
frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
frame32->edi = 0;
frame32->esi = 0;
frame32->edx = 0;
frame32->ecx = 0;
frame32->ebx = 0;
frame32->retaddr = (DWORD)TASK_CallToStart;
/* The remaining fields will be initialized in TASK_Reschedule */
if (!THREAD_Current()->cur_stack)
THREAD_Current()->cur_stack = pTask->thdb->cur_stack;
/* Add the task to the linked list */
TASK_LinkTask( hTask );
TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
name, cmdLine, hTask );
return hTask;
}
/***********************************************************************
* TASK_DeleteTask
*/
static void TASK_DeleteTask( HTASK16 hTask )
{
TDB *pTask;
HGLOBAL16 hPDB;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
hPDB = pTask->hPDB;
pTask->magic = 0xdead; /* invalidate signature */
/* Delete the Win32 part of the task */
K32OBJ_DecCount( &pTask->thdb->process->header );
K32OBJ_DecCount( &pTask->thdb->header );
/* Free the task module */
MODULE_FreeModule( pTask->hModule, pTask );
/* Free the selector aliases */
GLOBAL_FreeBlock( pTask->hCSAlias );
GLOBAL_FreeBlock( pTask->hPDB );
/* 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). */
GlobalFreeAll( hPDB );
}
/***********************************************************************
* TASK_KillCurrentTask
*
* Kill the currently running task. As it's not possible to kill the
* current task like this, it is simply marked for destruction, and will
* be killed when either TASK_Reschedule or this function is called again
* in the context of another task.
*/
void TASK_KillCurrentTask( INT16 exitCode )
{
TDB* pTask = (TDB*) GlobalLock16( hCurrentTask );
if (!pTask) USER_ExitWindows(); /* No current task yet */
TRACE(task, "Killing task %04x\n", hCurrentTask );
/* Delete active sockets */
if( pTask->pwsi )
WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
/* Perform USER cleanup */
if (pTask->userhandler)
pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
pTask->hInstance, pTask->hQueue );
if (hTaskToKill && (hTaskToKill != hCurrentTask))
{
/* If another task is already marked for destruction, */
/* we can kill it now, as we are in another context. */
TASK_DeleteTask( hTaskToKill );
}
if (nTaskCount <= 1)
{
TRACE(task, "this is the last task, exiting\n" );
USER_ExitWindows();
}
/* Remove the task from the list to be sure we never switch back to it */
TASK_UnlinkTask( hCurrentTask );
if( nTaskCount )
{
TDB* p = (TDB *)GlobalLock16( hFirstTask );
while( p )
{
if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
p = (TDB *)GlobalLock16( p->hNext );
}
}
hTaskToKill = hCurrentTask;
hLockedTask = 0;
pTask->nEvents = 0;
TASK_YieldToSystem(pTask);
/* We should never return from this Yield() */
fprintf(stderr,"Return of the living dead %04x!!!\n", hCurrentTask);
exit(1);
}
/***********************************************************************
* TASK_Reschedule
*
* This is where all the magic of task-switching happens!
*
* Note: This function should only be called via the TASK_YieldToSystem()
* wrapper, to make sure that all the context is saved correctly.
*
* It must not call functions that may yield control.
*/
void TASK_Reschedule(void)
{
TDB *pOldTask = NULL, *pNewTask;
HTASK16 hTask = 0;
STACK16FRAME *newframe16;
#ifdef CONFIG_IPC
dde_reschedule();
#endif
/* First check if there's a task to kill */
if (hTaskToKill && (hTaskToKill != hCurrentTask))
{
TASK_DeleteTask( hTaskToKill );
hTaskToKill = 0;
}
/* Find a task to yield to */
pOldTask = (TDB *)GlobalLock16( hCurrentTask );
if (pOldTask && pOldTask->hYieldTo)
{
/* check for DirectedYield() */
hTask = pOldTask->hYieldTo;
pNewTask = (TDB *)GlobalLock16( hTask );
if( !pNewTask || !pNewTask->nEvents) hTask = 0;
pOldTask->hYieldTo = 0;
}
/* extract hardware events only! */
if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
while (!hTask)
{
/* Find a task that has an event pending */
hTask = hFirstTask;
while (hTask)
{
pNewTask = (TDB *)GlobalLock16( hTask );
TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
if (pNewTask->nEvents) break;
hTask = pNewTask->hNext;
}
if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
if (hTask) break;
/* No task found, wait for some events to come in */
EVENT_WaitNetEvent( TRUE, TRUE );
}
if (hTask == hCurrentTask)
{
TRACE(task, "returning to the current task(%04x)\n", hTask );
return; /* Nothing to do */
}
pNewTask = (TDB *)GlobalLock16( hTask );
TRACE(task, "Switching to task %04x (%.8s)\n",
hTask, pNewTask->module_name );
/* Make the task the last in the linked list (round-robin scheduling) */
pNewTask->priority++;
TASK_UnlinkTask( hTask );
TASK_LinkTask( hTask );
pNewTask->priority--;
/* Finish initializing the new task stack if necessary */
newframe16 = THREAD_STACK16( pNewTask->thdb );
if (!newframe16->entry_cs)
{
STACK16FRAME *oldframe16 = CURRENT_STACK16;
STACK32FRAME *oldframe32 = oldframe16->frame32;
STACK32FRAME *newframe32 = newframe16->frame32;
newframe16->entry_ip = oldframe16->entry_ip;
newframe16->entry_cs = oldframe16->entry_cs;
newframe16->ip = oldframe16->ip;
newframe16->cs = oldframe16->cs;
newframe32->ebp = oldframe32->ebp;
newframe32->restore_addr = oldframe32->restore_addr;
newframe32->codeselector = oldframe32->codeselector;
}
/* Switch to the new stack */
hCurrentTask = hTask;
SET_CUR_THREAD( pNewTask->thdb );
pNewTask->ss_sp = pNewTask->thdb->cur_stack;
}
/***********************************************************************
* TASK_YieldToSystem
*
* Scheduler interface, this way we ensure that all "unsafe" events are
* processed outside the scheduler.
*/
void TASK_YieldToSystem(TDB* pTask)
{
MESSAGEQUEUE* pQ;
Callbacks->CallTaskRescheduleProc();
if( pTask )
{
pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
!(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
{
pQ->flags &= ~QUEUE_FLAG_XEVENT;
EVENT_WaitNetEvent( FALSE, FALSE );
}
}
}
/***********************************************************************
* InitTask (KERNEL.91)
*
* Called by the application startup code.
*/
void WINAPI InitTask( CONTEXT *context )
{
TDB *pTask;
NE_MODULE *pModule;
SEGTABLEENTRY *pSegTable;
INSTANCEDATA *pinstance;
LONG stacklow, stackhi;
if (context) EAX_reg(context) = 0;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
if (!(pModule = MODULE_GetPtr( pTask->hModule ))) return;
/* This is a hack to install task USER signal handler before
* implicitly loaded DLLs are initialized (see windows/user.c) */
pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
/* Initialize implicitly loaded DLLs */
NE_InitializeDLLs( pTask->hModule );
if (context)
{
/* 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
*/
EAX_reg(context) = 1;
EBX_reg(context) = pTask->pdb.cmdLine[0] ? 0x81 : 0x80;
ECX_reg(context) = pModule->stack_size;
EDX_reg(context) = pTask->nCmdShow;
ESI_reg(context) = (DWORD)pTask->hPrevInstance;
EDI_reg(context) = (DWORD)pTask->hInstance;
ES_reg (context) = (WORD)pTask->hPDB;
}
/* Initialize the local heap */
if ( pModule->heap_size )
{
LocalInit( pTask->hInstance, 0, pModule->heap_size );
}
/* Initialize the INSTANCEDATA structure */
pSegTable = NE_SEG_TABLE( pModule );
stacklow = pSegTable[pModule->ss - 1].minsize;
stackhi = stacklow + pModule->stack_size;
if (stackhi > 0xffff) stackhi = 0xffff;
pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
pinstance->stacktop = stacklow;
pinstance->stackmin = OFFSETOF( pTask->thdb->cur_stack );
}
/***********************************************************************
* WaitEvent (KERNEL.30)
*/
BOOL16 WINAPI WaitEvent( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
pTask = (TDB *)GlobalLock16( hTask );
if (pTask->nEvents > 0)
{
pTask->nEvents--;
return FALSE;
}
TASK_YieldToSystem(pTask);
/* When we get back here, we have an event */
if (pTask->nEvents > 0) pTask->nEvents--;
return TRUE;
}
/***********************************************************************
* PostEvent (KERNEL.31)
*/
void WINAPI PostEvent( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
pTask->nEvents++;
}
/***********************************************************************
* SetPriority (KERNEL.32)
*/
void WINAPI SetPriority( HTASK16 hTask, INT16 delta )
{
TDB *pTask;
INT16 newpriority;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
newpriority = pTask->priority + delta;
if (newpriority < -32) newpriority = -32;
else if (newpriority > 15) newpriority = 15;
pTask->priority = newpriority + 1;
TASK_UnlinkTask( hTask );
TASK_LinkTask( hTask );
pTask->priority--;
}
/***********************************************************************
* LockCurrentTask (KERNEL.33)
*/
HTASK16 WINAPI LockCurrentTask( BOOL16 bLock )
{
if (bLock) hLockedTask = hCurrentTask;
else hLockedTask = 0;
return hLockedTask;
}
/***********************************************************************
* IsTaskLocked (KERNEL.122)
*/
HTASK16 WINAPI IsTaskLocked(void)
{
return hLockedTask;
}
/***********************************************************************
* OldYield (KERNEL.117)
*/
void WINAPI OldYield(void)
{
TDB *pCurTask;
pCurTask = (TDB *)GlobalLock16( hCurrentTask );
if (pCurTask) pCurTask->nEvents++; /* Make sure we get back here */
TASK_YieldToSystem(pCurTask);
if (pCurTask) pCurTask->nEvents--;
}
/***********************************************************************
* DirectedYield (KERNEL.150)
*/
void WINAPI DirectedYield( HTASK16 hTask )
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
pCurTask->hYieldTo = hTask;
OldYield();
}
/***********************************************************************
* UserYield (USER.332)
*/
void WINAPI UserYield(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
/* Handle sent messages */
while (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
OldYield();
queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
while (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
}
/***********************************************************************
* Yield16 (KERNEL.29)
*/
void WINAPI Yield16(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
if (pCurTask) pCurTask->hYieldTo = 0;
if (pCurTask && pCurTask->hQueue) UserYield();
else OldYield();
}
/***********************************************************************
* MakeProcInstance16 (KERNEL.51)
*/
FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
{
BYTE *thunk,*lfunc;
SEGPTR thunkaddr;
if (!hInstance) return 0;
if (__winelib) return func; /* func can be called directly in Winelib */
thunkaddr = TASK_AllocThunk( hCurrentTask );
if (!thunkaddr) return (FARPROC16)0;
thunk = PTR_SEG_TO_LIN( thunkaddr );
lfunc = PTR_SEG_TO_LIN( func );
TRACE(task, "(%08lx,%04x): got thunk %08lx\n",
(DWORD)func, hInstance, (DWORD)thunkaddr );
if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) ||
((lfunc[0]==0x1e) && (lfunc[1]==0x58))
) {
fprintf(stderr,"FIXME: MakeProcInstance16 thunk would be useless for %p, overwriting with nop;nop;\n", func );
lfunc[0]=0x90; /* nop */
lfunc[1]=0x90; /* nop */
}
*thunk++ = 0xb8; /* movw instance, %ax */
*thunk++ = (BYTE)(hInstance & 0xff);
*thunk++ = (BYTE)(hInstance >> 8);
*thunk++ = 0xea; /* ljmp func */
*(DWORD *)thunk = (DWORD)func;
return (FARPROC16)thunkaddr;
}
/***********************************************************************
* FreeProcInstance16 (KERNEL.52)
*/
void WINAPI FreeProcInstance16( FARPROC16 func )
{
TRACE(task, "(%08lx)\n", (DWORD)func );
if (!__winelib) TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
}
/**********************************************************************
* GetCodeHandle (KERNEL.93)
*/
HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
{
HANDLE16 handle;
BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
if (__winelib) return 0;
/* Return the code segment containing 'proc'. */
/* Not sure if this is really correct (shouldn't matter that much). */
/* Check if it is really a thunk */
if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
else
handle = GlobalHandle16( HIWORD(proc) );
return handle;
}
/**********************************************************************
* DefineHandleTable16 (KERNEL.94)
*/
BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
{
return TRUE; /* FIXME */
}
/***********************************************************************
* SetTaskQueue (KERNEL.34)
*/
HQUEUE16 WINAPI SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
{
HQUEUE16 hPrev;
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
hPrev = pTask->hQueue;
pTask->hQueue = hQueue;
TIMER_SwitchQueue( hPrev, hQueue );
return hPrev;
}
/***********************************************************************
* GetTaskQueue (KERNEL.35)
*/
HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
return pTask->hQueue;
}
/***********************************************************************
* SwitchStackTo (KERNEL.108)
*/
void WINAPI SwitchStackTo( WORD seg, WORD ptr, WORD top )
{
TDB *pTask;
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
UINT16 copySize;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
TRACE(task, "old=%04x:%04x new=%04x:%04x\n",
SELECTOROF( pTask->thdb->cur_stack ),
OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
/* Save the old stack */
pData->old_ss_sp = pTask->thdb->cur_stack;
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.
*/
oldFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg,
ptr - sizeof(STACK16FRAME) - 3 * sizeof(WORD) );
newFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
/* Copy the stack frame and the local variables to the new stack */
copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
memmove( newFrame, oldFrame, MAX( copySize, sizeof(STACK16FRAME) ));
}
/***********************************************************************
* SwitchStackBack (KERNEL.109)
*
* Note: the function is declared as 'register' in the spec file in order
* to make sure all registers are preserved, but we don't use them in any
* way, so we don't need a CONTEXT* argument.
*/
void WINAPI SwitchStackBack(void)
{
TDB *pTask;
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->cur_stack))))
return;
if (!pData->old_ss_sp)
{
fprintf( stderr, "SwitchStackBack: no previous SwitchStackTo\n" );
return;
}
TRACE(task, "restoring stack %04x:%04x\n",
SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
oldFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
/* Switch back to the old stack */
pTask->thdb->cur_stack = pData->old_ss_sp;
pData->old_ss_sp = 0;
/* Build a stack frame for the return */
newFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
newFrame->frame32 = oldFrame->frame32;
if (TRACE_ON(relay))
{
newFrame->entry_ip = oldFrame->entry_ip;
newFrame->entry_cs = oldFrame->entry_cs;
}
}
/***********************************************************************
* GetTaskQueueDS (KERNEL.118)
*/
void WINAPI GetTaskQueueDS( CONTEXT *context )
{
DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
/***********************************************************************
* GetTaskQueueES (KERNEL.119)
*/
void WINAPI GetTaskQueueES( CONTEXT *context )
{
ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
/***********************************************************************
* GetCurrentTask (KERNEL.36)
*/
HTASK16 WINAPI GetCurrentTask(void)
{
return hCurrentTask;
}
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( hCurrentTask, hFirstTask );
}
/***********************************************************************
* GetCurrentPDB (KERNEL.37)
*/
HANDLE16 WINAPI GetCurrentPDB(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->hPDB;
}
/***********************************************************************
* GetInstanceData (KERNEL.54)
*/
INT16 WINAPI GetInstanceData( HINSTANCE16 instance, WORD buffer, INT16 len )
{
char *ptr = (char *)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 GetExeVersion(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->version;
}
/***********************************************************************
* SetErrorMode16 (KERNEL.107)
*/
UINT16 WINAPI SetErrorMode16( UINT16 mode )
{
TDB *pTask;
UINT16 oldMode;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
oldMode = pTask->error_mode;
pTask->error_mode = mode;
pTask->thdb->process->error_mode = mode;
return oldMode;
}
/***********************************************************************
* SetErrorMode32 (KERNEL32.486)
*/
UINT32 WINAPI SetErrorMode32( UINT32 mode )
{
return SetErrorMode16( (UINT16)mode );
}
/***********************************************************************
* GetDOSEnvironment (KERNEL.131)
*/
SEGPTR WINAPI GetDOSEnvironment(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return (SEGPTR)WIN16_GlobalLock16( pTask->pdb.environment );
}
/***********************************************************************
* GetNumTasks (KERNEL.152)
*/
UINT16 WINAPI GetNumTasks(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 GetTaskDS(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->hInstance;
}
/***********************************************************************
* IsTask (KERNEL.320)
*/
BOOL16 WINAPI IsTask( HTASK16 hTask )
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
return (pTask->magic == TDB_MAGIC);
}
/***********************************************************************
* SetTaskSignalProc (KERNEL.38)
*
* Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
*/
FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
{
TDB *pTask;
FARPROC16 oldProc;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
oldProc = (FARPROC16)pTask->userhandler;
pTask->userhandler = (USERSIGNALPROC)proc;
return oldProc;
}
/***********************************************************************
* SetSigHandler (KERNEL.140)
*/
WORD WINAPI SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
UINT16 *oldmode, UINT16 newmode, UINT16 flag )
{
FIXME(task,"(%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 = (TDB *)GlobalLock16( hCurrentTask ))) 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)
*/
VOID WINAPI GlobalNotify( FARPROC16 proc )
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
pTask->discardhandler = proc;
}
/***********************************************************************
* GetExePtr (KERNEL.133)
*/
HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
{
char *ptr;
HTASK16 hTask;
HANDLE16 owner;
/* Check for module handle */
if (!(ptr = GlobalLock16( handle ))) return 0;
if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
/* Check the owner for module handle */
owner = FarGetOwner( handle );
if (!(ptr = GlobalLock16( owner ))) return 0;
if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
/* Search for this handle and its owner inside all tasks */
hTask = hFirstTask;
while (hTask)
{
TDB *pTask = (TDB *)GlobalLock16( hTask );
if ((hTask == handle) ||
(pTask->hInstance == handle) ||
(pTask->hQueue == handle) ||
(pTask->hPDB == handle)) return pTask->hModule;
if ((hTask == owner) ||
(pTask->hInstance == owner) ||
(pTask->hQueue == owner) ||
(pTask->hPDB == owner)) return pTask->hModule;
hTask = pTask->hNext;
}
return 0;
}
/***********************************************************************
* TaskFirst (TOOLHELP.63)
*/
BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
{
lpte->hNext = hFirstTask;
return TaskNext( lpte );
}
/***********************************************************************
* TaskNext (TOOLHELP.64)
*/
BOOL16 WINAPI TaskNext( TASKENTRY *lpte )
{
TDB *pTask;
INSTANCEDATA *pInstData;
TRACE(toolhelp, "(%p): task=%04x\n", lpte, lpte->hNext );
if (!lpte->hNext) return FALSE;
pTask = (TDB *)GlobalLock16( lpte->hNext );
if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
lpte->hTask = lpte->hNext;
lpte->hTaskParent = pTask->hParent;
lpte->hInst = pTask->hInstance;
lpte->hModule = pTask->hModule;
lpte->wSS = SELECTOROF( pTask->thdb->cur_stack );
lpte->wSP = OFFSETOF( pTask->thdb->cur_stack );
lpte->wStackTop = pInstData->stacktop;
lpte->wStackMinimum = pInstData->stackmin;
lpte->wStackBottom = pInstData->stackbottom;
lpte->wcEvents = pTask->nEvents;
lpte->hQueue = pTask->hQueue;
strncpy( lpte->szModule, pTask->module_name, 8 );
lpte->szModule[8] = '\0';
lpte->wPSPOffset = 0x100; /*??*/
lpte->hNext = pTask->hNext;
return TRUE;
}
/***********************************************************************
* TaskFindHandle (TOOLHELP.65)
*/
BOOL16 WINAPI TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
{
lpte->hNext = hTask;
return TaskNext( lpte );
}
/***********************************************************************
* GetAppCompatFlags16 (KERNEL.354)
*/
DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
{
return GetAppCompatFlags32( hTask );
}
/***********************************************************************
* GetAppCompatFlags32 (USER32.205)
*/
DWORD WINAPI GetAppCompatFlags32( HTASK32 hTask )
{
TDB *pTask;
if (!hTask) hTask = GetCurrentTask();
if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
return pTask->compat_flags;
}