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Sweden-Number/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 "task.h"
#include "callback.h"
#include "file.h"
#include "global.h"
#include "instance.h"
#include "message.h"
#include "miscemu.h"
#include "module.h"
#include "neexe.h"
#include "options.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 "stddebug.h"
#include "debug.h"
#include "dde_proc.h"
#ifndef WINELIB
#include "debugger.h"
#endif
/* Min. number of thunks allocated when creating a new segment */
#define MIN_THUNKS 32
extern void USER_AppExit( HTASK16, HINSTANCE16, HQUEUE16 );
/* Saved 16-bit stack for current process (Win16 only) */
WORD IF1632_Saved16_ss = 0;
WORD IF1632_Saved16_sp = 0;
/* Saved 32-bit stack for current process (Win16 only) */
DWORD IF1632_Saved32_esp = 0;
/* Original Unix stack */
DWORD IF1632_Original32_esp;
static HTASK16 hFirstTask = 0;
static HTASK16 hCurrentTask = 0;
static HTASK16 hTaskToKill = 0;
static HTASK16 hLockedTask = 0;
static UINT16 nTaskCount = 0;
static HGLOBAL16 hDOSEnvironment = 0;
/* TASK_Reschedule() 16-bit entry point */
static FARPROC16 TASK_RescheduleProc;
#ifdef WINELIB
#define TASK_SCHEDULE() TASK_Reschedule()
#else
#define TASK_SCHEDULE() CallTo16_word_(TASK_RescheduleProc)
#endif
static HGLOBAL16 TASK_CreateDOSEnvironment(void);
static void TASK_YieldToSystem(TDB*);
/***********************************************************************
* TASK_Init
*/
BOOL32 TASK_Init(void)
{
TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
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 );
dprintf_task(stddeb, "Master DOS environment at %p\n", p);
for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, " %s\n", p);
dprintf_task( stddeb, "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 BOOL 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.
*/
#ifndef WINELIB
static void TASK_CallToStart(void)
{
int cs_reg, ds_reg, ip_reg;
int exit_code = 1;
TDB *pTask = (TDB *)GlobalLock16( hCurrentTask );
NE_MODULE *pModule = MODULE_GetPtr( pTask->hModule );
SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
IF1632_Saved16_ss = pTask->ss;
IF1632_Saved16_sp = pTask->sp;
if (pModule->flags & NE_FFLAGS_WIN32)
{
/* FIXME: all this is an ugly hack */
extern void InitTask( CONTEXT *context );
extern void PE_InitializeDLLs( HMODULE16 hModule );
InitTask( NULL );
InitApp( pTask->hModule );
__asm__ __volatile__("movw %w0,%%fs"::"r" (pCurrentThread->teb_sel));
PE_InitializeDLLs( pTask->hModule );
exit_code = CallTaskStart32((FARPROC32)(pModule->pe_module->load_addr +
pModule->pe_module->pe_header->OptionalHeader.AddressOfEntryPoint) );
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
*/
cs_reg = pSegTable[pModule->cs - 1].selector;
ip_reg = pModule->ip;
ds_reg = pSegTable[pModule->dgroup - 1].selector;
dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n",
cs_reg, ip_reg, ds_reg,
IF1632_Saved16_ss, IF1632_Saved16_sp);
CallTo16_regs_( (FARPROC16)(cs_reg << 16 | ip_reg), ds_reg,
pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/,
pModule->stack_size /*bx*/, pModule->heap_size /*cx*/,
0 /*dx*/, 0 /*si*/, ds_reg /*di*/ );
/* This should never return */
fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
TASK_KillCurrentTask( 1 );
}
}
#endif
/***********************************************************************
* 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;
char filename[256];
char *stack16Top, *stack32Top;
STACK16FRAME *frame16;
STACK32FRAME *frame32;
#ifndef WINELIB32
extern DWORD CALLTO16_RetAddr_word;
#endif
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 ) );
/* Get current directory */
GetModuleFileName16( hModule, filename, sizeof(filename) );
name = strrchr(filename, '\\');
if (name) *(name+1) = 0;
/* 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->curdrive = filename[0] - 'A' + 0x80;
strcpy( pTask->curdir, filename+2 );
pTask->magic = TDB_MAGIC;
pTask->nCmdShow = cmdShow;
/* 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 */
#ifndef WINELIB
*(FARPROC16 *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 ); /* KERNEL.102 is DOS3Call() */
#endif
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 + 1, cmdLine, 127 );
pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
/* 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 );
pTask->thdb = THREAD_Create( pdb32, 0 );
/* Create the 32-bit stack frame */
stack32Top = (char*)pTask->thdb->teb.stack_top;
frame32 = (STACK32FRAME *)stack32Top - 1;
frame32->saved_esp = (DWORD)stack32Top;
frame32->edi = 0;
frame32->esi = 0;
frame32->edx = 0;
frame32->ecx = 0;
frame32->ebx = 0;
frame32->ebp = 0;
#ifndef WINELIB
frame32->retaddr = (DWORD)TASK_CallToStart;
frame32->codeselector = WINE_CODE_SELECTOR;
#endif
pTask->esp = (DWORD)frame32;
/* Create the 16-bit stack frame */
pTask->ss = hInstance;
pTask->sp = ((pModule->sp != 0) ? pModule->sp :
pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1;
stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp );
frame16 = (STACK16FRAME *)stack16Top - 1;
frame16->saved_ss = 0;
frame16->saved_sp = 0;
frame16->ds = frame16->es = pTask->hInstance;
frame16->entry_point = 0;
frame16->entry_ip = OFFSETOF(TASK_RescheduleProc) + 14;
frame16->entry_cs = SELECTOROF(TASK_RescheduleProc);
frame16->bp = 0;
#ifndef WINELIB
frame16->ip = LOWORD( CALLTO16_RetAddr_word );
frame16->cs = HIWORD( CALLTO16_RetAddr_word );
#endif /* WINELIB */
pTask->sp -= sizeof(STACK16FRAME);
/* If there's no 16-bit stack yet, use a part of the new task stack */
/* This is only needed to have a stack to switch from on the first */
/* call to DirectedYield(). */
if (!IF1632_Saved16_ss)
{
IF1632_Saved16_ss = pTask->ss;
IF1632_Saved16_sp = pTask->sp;
}
/* Add a breakpoint at the start of the task */
#ifndef WINELIB
if (Options.debug)
{
if (pModule->flags & NE_FFLAGS_WIN32)
{
DBG_ADDR addr = { NULL, 0, pModule->pe_module->load_addr +
pModule->pe_module->pe_header->OptionalHeader.AddressOfEntryPoint };
fprintf( stderr, "Win32 task '%s': ", name );
DEBUG_AddBreakpoint( &addr );
}
else
{
DBG_ADDR addr = { NULL, pSegTable[pModule->cs-1].selector, pModule->ip };
fprintf( stderr, "Win16 task '%s': ", name );
DEBUG_AddBreakpoint( &addr );
}
}
#endif /* WINELIB */
/* Add the task to the linked list */
TASK_LinkTask( hTask );
dprintf_task( stddeb, "CreateTask: 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;
/* Delete the Win32 part of the task */
PROCESS_Destroy( &pTask->thdb->process->header );
THREAD_Destroy( &pTask->thdb->header );
/* Free the task module */
FreeModule16( pTask->hModule );
/* 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 )
{
extern void EXEC_ExitWindows(void);
TDB* pTask = (TDB*) GlobalLock16( hCurrentTask );
if (!pTask) EXEC_ExitWindows(); /* No current task yet */
/* Perform USER cleanup */
USER_AppExit( hCurrentTask, 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)
{
dprintf_task( stddeb, "Killing the last task, exiting\n" );
EXEC_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;
#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_WaitXEvent( FALSE, TRUE );
while (!hTask)
{
/* Find a task that has an event pending */
hTask = hFirstTask;
while (hTask)
{
pNewTask = (TDB *)GlobalLock16( hTask );
dprintf_task( stddeb, "\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_WaitXEvent( TRUE, TRUE );
}
if (hTask == hCurrentTask)
{
dprintf_task( stddeb, "returning to the current task(%04x)\n", hTask );
return; /* Nothing to do */
}
pNewTask = (TDB *)GlobalLock16( hTask );
dprintf_task( stddeb, "Switching to task %04x (%.8s)\n",
hTask, pNewTask->module_name );
/* Save the stacks of the previous task (if any) */
if (pOldTask)
{
pOldTask->ss = IF1632_Saved16_ss;
pOldTask->sp = IF1632_Saved16_sp;
pOldTask->esp = IF1632_Saved32_esp;
}
else IF1632_Original32_esp = IF1632_Saved32_esp;
/* Make the task the last in the linked list (round-robin scheduling) */
pNewTask->priority++;
TASK_UnlinkTask( hTask );
TASK_LinkTask( hTask );
pNewTask->priority--;
/* Switch to the new stack */
hCurrentTask = hTask;
pCurrentThread = pNewTask->thdb;
pCurrentProcess = pCurrentThread->process;
IF1632_Saved16_ss = pNewTask->ss;
IF1632_Saved16_sp = pNewTask->sp;
IF1632_Saved32_esp = pNewTask->esp;
}
/***********************************************************************
* TASK_YieldToSystem
*
* Scheduler interface, this way we ensure that all "unsafe" events are
* processed outside the scheduler.
*/
void TASK_YieldToSystem(TDB* pTask)
{
MESSAGEQUEUE* pQ;
TASK_SCHEDULE();
if( pTask )
{
pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
if( pQ && pQ->flags & QUEUE_FLAG_XEVENT )
{
pQ->flags &= ~QUEUE_FLAG_XEVENT;
EVENT_WaitXEvent( FALSE, FALSE );
}
}
}
/***********************************************************************
* InitTask (KERNEL.91)
*/
void 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;
#ifndef WINELIB
NE_InitializeDLLs( pTask->hModule );
#endif
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) = 0x81;
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;
#ifndef WINELIB
pinstance->stackmin = IF1632_Saved16_sp;
#endif
}
/***********************************************************************
* WaitEvent (KERNEL.30)
*/
BOOL16 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 PostEvent( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
pTask->nEvents++;
}
/***********************************************************************
* SetPriority (KERNEL.32)
*/
void 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 LockCurrentTask( BOOL16 bLock )
{
if (bLock) hLockedTask = hCurrentTask;
else hLockedTask = 0;
return hLockedTask;
}
/***********************************************************************
* IsTaskLocked (KERNEL.122)
*/
HTASK16 IsTaskLocked(void)
{
return hLockedTask;
}
/***********************************************************************
* OldYield (KERNEL.117)
*/
void 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 DirectedYield( HTASK16 hTask )
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
pCurTask->hYieldTo = hTask;
OldYield();
}
/***********************************************************************
* UserYield (USER.332)
*/
void UserYield(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
/* Handle sent messages */
if (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
OldYield();
queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
if (queue && (queue->wakeBits & QS_SENDMESSAGE))
QUEUE_ReceiveMessage( queue );
}
/***********************************************************************
* Yield (KERNEL.29)
*/
void Yield(void)
{
TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
if (pCurTask) pCurTask->hYieldTo = 0;
if (pCurTask && pCurTask->hQueue) UserYield();
else OldYield();
}
/***********************************************************************
* MakeProcInstance16 (KERNEL.51)
*/
FARPROC16 MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
{
BYTE *thunk;
SEGPTR thunkaddr;
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 );
dprintf_task( stddeb, "MakeProcInstance(%08lx,%04x): got thunk %08lx\n",
(DWORD)func, hInstance, (DWORD)thunkaddr );
*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 FreeProcInstance16( FARPROC16 func )
{
dprintf_task( stddeb, "FreeProcInstance(%08lx)\n", (DWORD)func );
if (!__winelib) TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
}
/**********************************************************************
* GetCodeHandle (KERNEL.93)
*/
HANDLE16 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;
}
/***********************************************************************
* SetTaskQueue (KERNEL.34)
*/
HQUEUE16 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 GetTaskQueue( HTASK16 hTask )
{
TDB *pTask;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
return pTask->hQueue;
}
/***********************************************************************
* SwitchStackTo (KERNEL.108)
*/
void 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;
dprintf_task( stddeb, "SwitchStackTo: old=%04x:%04x new=%04x:%04x\n",
IF1632_Saved16_ss, IF1632_Saved16_sp, seg, ptr );
/* Save the old stack */
oldFrame = CURRENT_STACK16;
pData->old_sp = IF1632_Saved16_sp;
pData->old_ss = IF1632_Saved16_ss;
pData->stacktop = top;
pData->stackmin = ptr;
pData->stackbottom = ptr;
/* Switch to the new stack */
IF1632_Saved16_ss = pTask->ss = seg;
IF1632_Saved16_sp = pTask->sp = ptr - sizeof(STACK16FRAME);
newFrame = CURRENT_STACK16;
/* Copy the stack frame and the local variables to the new stack */
copySize = oldFrame->bp - pData->old_sp;
memcpy( 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 SwitchStackBack(void)
{
TDB *pTask;
STACK16FRAME *oldFrame, *newFrame;
INSTANCEDATA *pData;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
if (!(pData = (INSTANCEDATA *)GlobalLock16( IF1632_Saved16_ss ))) return;
if (!pData->old_ss)
{
fprintf( stderr, "SwitchStackBack: no previous SwitchStackTo\n" );
return;
}
dprintf_task( stddeb, "SwitchStackBack: restoring stack %04x:%04x\n",
pData->old_ss, pData->old_sp );
oldFrame = CURRENT_STACK16;
/* Switch back to the old stack */
IF1632_Saved16_ss = pTask->ss = pData->old_ss;
IF1632_Saved16_sp = pTask->sp = pData->old_sp;
pData->old_ss = pData->old_sp = 0;
/* Build a stack frame for the return */
newFrame = CURRENT_STACK16;
newFrame->saved_ss = oldFrame->saved_ss;
newFrame->saved_sp = oldFrame->saved_sp;
newFrame->entry_ip = oldFrame->entry_ip;
newFrame->entry_cs = oldFrame->entry_cs;
newFrame->bp = oldFrame->bp;
newFrame->ip = oldFrame->ip;
newFrame->cs = oldFrame->cs;
}
/***********************************************************************
* GetTaskQueueDS (KERNEL.118)
*/
#ifndef WINELIB
void GetTaskQueueDS( CONTEXT *context )
{
DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
#endif /* WINELIB */
/***********************************************************************
* GetTaskQueueES (KERNEL.119)
*/
#ifndef WINELIB
void GetTaskQueueES( CONTEXT *context )
{
ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
}
#endif /* WINELIB */
/***********************************************************************
* GetCurrentTask (KERNEL.36)
*/
HTASK16 GetCurrentTask(void)
{
return hCurrentTask;
}
DWORD 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 GetCurrentPDB(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->hPDB;
}
/***********************************************************************
* GetInstanceData (KERNEL.54)
*/
INT16 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 GetExeVersion(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->version;
}
/***********************************************************************
* SetErrorMode (KERNEL.107)
*/
UINT SetErrorMode( UINT mode )
{
TDB *pTask;
UINT oldMode;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
oldMode = pTask->error_mode;
pTask->error_mode = mode;
return oldMode;
}
/***********************************************************************
* GetDOSEnvironment (KERNEL.131)
*/
SEGPTR GetDOSEnvironment(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return (SEGPTR)WIN16_GlobalLock16( pTask->pdb.environment );
}
/***********************************************************************
* GetNumTasks (KERNEL.152)
*/
UINT16 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 GetTaskDS(void)
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
return pTask->hInstance;
}
/***********************************************************************
* IsTask (KERNEL.320)
*/
BOOL16 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)
*/
FARPROC16 SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
{
TDB *pTask;
FARPROC16 oldProc;
if (!hTask) hTask = hCurrentTask;
if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
oldProc = pTask->userhandler;
pTask->userhandler = proc;
return oldProc;
}
/***********************************************************************
* SetSigHandler (KERNEL.140)
*/
WORD SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
UINT16 *oldmode, UINT16 newmode, UINT16 flag )
{
fprintf(stdnimp,"SetSigHandler(%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 GlobalNotify( FARPROC16 proc )
{
TDB *pTask;
if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
pTask->discardhandler = proc;
}
/***********************************************************************
* GetExePtr (KERNEL.133)
*/
HMODULE16 GetExePtr( HANDLE16 handle )
{
char *ptr;
HTASK16 hTask;
HANDLE16 owner;
/* Check for module handle */
if (!(ptr = GlobalLock16( handle ))) return 0;
if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle;
/* Check the owner for module handle */
owner = FarGetOwner( handle );
if (!(ptr = GlobalLock16( owner ))) return 0;
if (((NE_MODULE *)ptr)->magic == NE_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 TaskFirst( TASKENTRY *lpte )
{
lpte->hNext = hFirstTask;
return TaskNext( lpte );
}
/***********************************************************************
* TaskNext (TOOLHELP.64)
*/
BOOL16 TaskNext( TASKENTRY *lpte )
{
TDB *pTask;
INSTANCEDATA *pInstData;
dprintf_toolhelp( stddeb, "TaskNext(%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 = pTask->ss;
lpte->wSP = pTask->sp;
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 TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
{
lpte->hNext = hTask;
return TaskNext( lpte );
}
/***********************************************************************
* GetAppCompatFlags (KERNEL.354) (USER32.205)
*/
DWORD GetAppCompatFlags( 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;
}
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