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Fix InitTask() to work if DGROUP was manually resized.

oldstable
Ulrich Weigand 1999-07-10 10:18:26 +00:00 committed by Alexandre Julliard
parent ec6aab5169
commit a3afeef325
1 changed files with 42 additions and 49 deletions
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91
loader/task.c
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@ -711,65 +711,58 @@ void TASK_Reschedule(void)
void WINAPI InitTask16( CONTEXT86 *context )
{
TDB *pTask;
NE_MODULE *pModule;
SEGTABLEENTRY *pSegTable;
INSTANCEDATA *pinstance;
LONG stacklow, stackhi;
SEGPTR ptr;
if (context) EAX_reg(context) = 0;
EAX_reg(context) = 0;
if (!(pTask = (TDB *)GlobalLock16( GetCurrentTask() ))) return;
if (!(pModule = NE_GetPtr( pTask->hModule ))) 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 = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
pinstance->stackmin = OFFSETOF( pTask->teb->cur_stack );
pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
pinstance->stacktop = ( pinstance->stackmin > BX_reg(context)?
pinstance->stackmin - BX_reg(context) : 0 ) + 150;
/* Initialize the local heap */
if ( CX_reg(context) )
LocalInit16( pTask->hInstance, 0, CX_reg(context) );
/* 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
*
* 0 (=%bp) is pushed on the stack
*/
SEGPTR ptr = STACK16_PUSH( pTask->teb, sizeof(WORD) );
*(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
SP_reg(context) -= 2;
/* 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( pTask->teb, sizeof(WORD) );
*(WORD *)PTR_SEG_TO_LIN(ptr) = 0;
SP_reg(context) -= 2;
EAX_reg(context) = 1;
EAX_reg(context) = 1;
if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80;
else
{
LPBYTE p = &pTask->pdb.cmdLine[1];
while ((*p == ' ') || (*p == '\t')) p++;
EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine);
}
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 )
if (!pTask->pdb.cmdLine[0]) EBX_reg(context) = 0x80;
else
{
LocalInit16( 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->teb->cur_stack );
LPBYTE p = &pTask->pdb.cmdLine[1];
while ((*p == ' ') || (*p == '\t')) p++;
EBX_reg(context) = 0x80 + (p - pTask->pdb.cmdLine);
}
ECX_reg(context) = pinstance->stacktop;
EDX_reg(context) = pTask->nCmdShow;
ESI_reg(context) = (DWORD)pTask->hPrevInstance;
EDI_reg(context) = (DWORD)pTask->hInstance;
ES_reg (context) = (WORD)pTask->hPDB;
}