973 lines
28 KiB
C
973 lines
28 KiB
C
/*
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* DOS Virtual Machine
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*
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* Copyright 1998 Ove Kåven
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* Copyright 2002 Jukka Heinonen
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* Note: This code hasn't been completely cleaned up yet.
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#include <sys/types.h>
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#include "wine/winbase16.h"
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#include "wine/exception.h"
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#include "windef.h"
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#include "winbase.h"
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#include "winternl.h"
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#include "wingdi.h"
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#include "winuser.h"
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#include "wownt32.h"
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#include "winnt.h"
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#include "wincon.h"
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#include "dosexe.h"
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#include "wine/debug.h"
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#include "excpt.h"
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WINE_DEFAULT_DEBUG_CHANNEL(int);
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WINE_DECLARE_DEBUG_CHANNEL(module);
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#ifdef MZ_SUPPORTED
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WINE_DECLARE_DEBUG_CHANNEL(relay);
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#endif
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WORD DOSVM_psp = 0;
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WORD DOSVM_retval = 0;
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/*
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* Wine DOS memory layout above 640k:
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*
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* a0000 - affff : VGA graphics (vga.c)
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* b0000 - bffff : Monochrome text (unused)
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* b8000 - bffff : VGA text (vga.c)
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* c0000 - cffff : EMS frame (int67.c)
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* d0000 - effff : Free memory for UMBs (himem.c)
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* f0000 - fffff : BIOS stuff (msdos/dosmem.c)
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* 100000 -10ffff : High memory area (unused)
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*/
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/*
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* Table of real mode segments and protected mode selectors
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* for code stubs and other miscellaneous storage.
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*/
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struct DPMI_segments *DOSVM_dpmi_segments = NULL;
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/*
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* First and last address available for upper memory blocks.
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*/
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#define DOSVM_UMB_BOTTOM 0xd0000
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#define DOSVM_UMB_TOP 0xeffff
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/*
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* First free address for upper memory blocks.
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*/
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static DWORD DOSVM_umb_free = DOSVM_UMB_BOTTOM;
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typedef struct _DOSEVENT {
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int irq,priority;
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DOSRELAY relay;
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void *data;
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struct _DOSEVENT *next;
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} DOSEVENT, *LPDOSEVENT;
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static struct _DOSEVENT *pending_event, *current_event;
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static HANDLE event_notifier;
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static CRITICAL_SECTION qcrit;
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static CRITICAL_SECTION_DEBUG critsect_debug =
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{
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0, 0, &qcrit,
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{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
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0, 0, { (DWORD_PTR)(__FILE__ ": qcrit") }
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};
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static CRITICAL_SECTION qcrit = { &critsect_debug, -1, 0, 0, 0, 0 };
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/***********************************************************************
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* DOSVM_HasPendingEvents
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*
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* Return true if there are pending events that are not
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* blocked by currently active event.
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*/
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static BOOL DOSVM_HasPendingEvents( void )
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{
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if (!pending_event)
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return FALSE;
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if (!current_event)
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return TRUE;
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if (pending_event->priority < current_event->priority)
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return TRUE;
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return FALSE;
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}
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/***********************************************************************
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* DOSVM_SendOneEvent
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*
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* Process single pending event.
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*
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* This function should be called with queue critical section locked.
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* The function temporarily releases the critical section if it is
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* possible that internal interrupt handler or user procedure will
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* be called. This is because we may otherwise get a deadlock if
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* another thread is waiting for the same critical section.
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*/
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static void DOSVM_SendOneEvent( CONTEXT86 *context )
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{
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LPDOSEVENT event = pending_event;
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/* Remove from pending events list. */
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pending_event = event->next;
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/* Process active event. */
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if (event->irq >= 0)
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{
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BYTE intnum = (event->irq < 8) ?
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(event->irq + 8) : (event->irq - 8 + 0x70);
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/* Event is an IRQ, move it to current events list. */
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event->next = current_event;
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current_event = event;
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TRACE( "Dispatching IRQ %d.\n", event->irq );
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if (ISV86(context))
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{
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/*
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* Note that if DOSVM_HardwareInterruptRM calls an internal
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* interrupt directly, current_event might be cleared
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* (and event freed) in this call.
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*/
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LeaveCriticalSection(&qcrit);
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DOSVM_HardwareInterruptRM( context, intnum );
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EnterCriticalSection(&qcrit);
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}
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else
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{
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/*
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* This routine only modifies current context so it is
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* not necessary to release critical section.
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*/
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DOSVM_HardwareInterruptPM( context, intnum );
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}
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}
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else
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{
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/* Callback event. */
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TRACE( "Dispatching callback event.\n" );
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if (ISV86(context))
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{
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/*
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* Call relay immediately in real mode.
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*/
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LeaveCriticalSection(&qcrit);
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(*event->relay)( context, event->data );
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EnterCriticalSection(&qcrit);
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}
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else
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{
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/*
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* Force return to relay code. We do not want to
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* call relay directly because we may be inside a signal handler.
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*/
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DOSVM_BuildCallFrame( context, event->relay, event->data );
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}
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HeapFree(GetProcessHeap(), 0, event);
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}
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}
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/***********************************************************************
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* DOSVM_SendQueuedEvents
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*
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* As long as context instruction pointer stays unmodified,
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* process all pending events that are not blocked by currently
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* active event.
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*
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* This routine assumes that caller has already cleared TEB.vm86_pending
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* and checked that interrupts are enabled.
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*/
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void DOSVM_SendQueuedEvents( CONTEXT86 *context )
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{
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DWORD old_cs = context->SegCs;
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DWORD old_ip = context->Eip;
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EnterCriticalSection(&qcrit);
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TRACE( "Called in %s mode %s events pending (time=%d)\n",
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ISV86(context) ? "real" : "protected",
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DOSVM_HasPendingEvents() ? "with" : "without",
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GetTickCount() );
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TRACE( "cs:ip=%04x:%08x, ss:sp=%04x:%08x\n",
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context->SegCs, context->Eip, context->SegSs, context->Esp);
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while (context->SegCs == old_cs &&
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context->Eip == old_ip &&
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DOSVM_HasPendingEvents())
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{
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DOSVM_SendOneEvent(context);
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/*
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* Event handling may have turned pending events flag on.
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* We disable it here because this prevents some
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* unnecessary calls to this function.
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*/
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get_vm86_teb_info()->vm86_pending = 0;
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}
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#ifdef MZ_SUPPORTED
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if (DOSVM_HasPendingEvents())
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{
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/*
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* Interrupts disabled, but there are still
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* pending events, make sure that pending flag is turned on.
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*/
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TRACE( "Another event is pending, setting VIP flag.\n" );
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get_vm86_teb_info()->vm86_pending |= VIP_MASK;
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}
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#else
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FIXME("No DOS .exe file support on this platform (yet)\n");
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#endif /* MZ_SUPPORTED */
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LeaveCriticalSection(&qcrit);
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}
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#ifdef MZ_SUPPORTED
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/***********************************************************************
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* DOSVM_QueueEvent
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*/
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void DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
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{
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LPDOSEVENT event, cur, prev;
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BOOL old_pending;
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if (MZ_Current()) {
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event = HeapAlloc(GetProcessHeap(), 0, sizeof(DOSEVENT));
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if (!event) {
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ERR("out of memory allocating event entry\n");
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return;
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}
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event->irq = irq; event->priority = priority;
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event->relay = relay; event->data = data;
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EnterCriticalSection(&qcrit);
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old_pending = DOSVM_HasPendingEvents();
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/* insert event into linked list, in order *after*
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* all earlier events of higher or equal priority */
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cur = pending_event; prev = NULL;
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while (cur && cur->priority<=priority) {
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prev = cur;
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cur = cur->next;
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}
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event->next = cur;
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if (prev) prev->next = event;
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else pending_event = event;
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if (!old_pending && DOSVM_HasPendingEvents()) {
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TRACE("new event queued, signalling (time=%d)\n", GetTickCount());
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/* Alert VM86 thread about the new event. */
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kill(dosvm_pid,SIGUSR2);
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/* Wake up DOSVM_Wait so that it can serve pending events. */
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SetEvent(event_notifier);
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} else {
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TRACE("new event queued (time=%d)\n", GetTickCount());
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}
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LeaveCriticalSection(&qcrit);
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} else {
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/* DOS subsystem not running */
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/* (this probably means that we're running a win16 app
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* which uses DPMI to thunk down to DOS services) */
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if (irq<0) {
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/* callback event, perform it with dummy context */
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CONTEXT86 context;
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memset(&context,0,sizeof(context));
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(*relay)(&context,data);
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} else {
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ERR("IRQ without DOS task: should not happen\n");
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}
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}
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}
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static void DOSVM_ProcessConsole(void)
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{
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INPUT_RECORD msg;
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DWORD res;
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BYTE scan, ascii;
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if (ReadConsoleInputA(GetStdHandle(STD_INPUT_HANDLE),&msg,1,&res)) {
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switch (msg.EventType) {
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case KEY_EVENT:
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scan = msg.Event.KeyEvent.wVirtualScanCode;
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ascii = msg.Event.KeyEvent.uChar.AsciiChar;
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TRACE("scan %02x, ascii %02x\n", scan, ascii);
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/* set the "break" (release) flag if key released */
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if (!msg.Event.KeyEvent.bKeyDown) scan |= 0x80;
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/* check whether extended bit is set,
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* and if so, queue the extension prefix */
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if (msg.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY) {
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DOSVM_Int09SendScan(0xE0,0);
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}
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DOSVM_Int09SendScan(scan, ascii);
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break;
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case MOUSE_EVENT:
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DOSVM_Int33Console(&msg.Event.MouseEvent);
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break;
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case WINDOW_BUFFER_SIZE_EVENT:
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FIXME("unhandled WINDOW_BUFFER_SIZE_EVENT.\n");
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break;
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case MENU_EVENT:
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FIXME("unhandled MENU_EVENT.\n");
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break;
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case FOCUS_EVENT:
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FIXME("unhandled FOCUS_EVENT.\n");
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break;
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default:
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FIXME("unknown console event: %d\n", msg.EventType);
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}
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}
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}
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static void DOSVM_ProcessMessage(MSG *msg)
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{
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BYTE scan = 0;
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TRACE("got message %04x, wparam=%08lx, lparam=%08lx\n",msg->message,msg->wParam,msg->lParam);
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if ((msg->message>=WM_MOUSEFIRST)&&
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(msg->message<=WM_MOUSELAST)) {
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DOSVM_Int33Message(msg->message,msg->wParam,msg->lParam);
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} else {
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switch (msg->message) {
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case WM_KEYUP:
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scan = 0x80;
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case WM_KEYDOWN:
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scan |= (msg->lParam >> 16) & 0x7f;
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/* check whether extended bit is set,
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* and if so, queue the extension prefix */
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if (msg->lParam & 0x1000000) {
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/* FIXME: some keys (function keys) have
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* extended bit set even when they shouldn't,
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* should check for them */
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DOSVM_Int09SendScan(0xE0,0);
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}
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DOSVM_Int09SendScan(scan,0);
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break;
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}
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}
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}
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/***********************************************************************
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* DOSVM_Wait
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*
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* Wait for asynchronous events. This routine temporarily enables
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* interrupts and waits until some asynchronous event has been
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* processed.
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*/
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void DOSVM_Wait( CONTEXT86 *waitctx )
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{
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if (DOSVM_HasPendingEvents())
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{
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CONTEXT86 context = *waitctx;
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/*
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* If DOSVM_Wait is called from protected mode we emulate
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* interrupt reflection and convert context into real mode context.
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* This is actually the correct thing to do as long as DOSVM_Wait
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* is only called from those interrupt functions that DPMI reflects
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* to real mode.
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*
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* FIXME: Need to think about where to place real mode stack.
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* FIXME: If DOSVM_Wait calls are nested stack gets corrupted.
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* Can this really happen?
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*/
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if (!ISV86(&context))
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{
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context.EFlags |= V86_FLAG;
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context.SegSs = 0xffff;
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context.Esp = 0;
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}
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context.EFlags |= VIF_MASK;
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context.SegCs = 0;
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context.Eip = 0;
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DOSVM_SendQueuedEvents(&context);
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if(context.SegCs || context.Eip)
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DPMI_CallRMProc( &context, NULL, 0, TRUE );
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}
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else
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{
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HANDLE objs[2];
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int objc = DOSVM_IsWin16() ? 2 : 1;
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DWORD waitret;
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objs[0] = event_notifier;
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objs[1] = GetStdHandle(STD_INPUT_HANDLE);
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waitret = MsgWaitForMultipleObjects( objc, objs, FALSE,
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INFINITE, QS_ALLINPUT );
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|
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if (waitret == WAIT_OBJECT_0)
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{
|
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/*
|
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* New pending event has been queued, we ignore it
|
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* here because it will be processed on next call to
|
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* DOSVM_Wait.
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*/
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}
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else if (objc == 2 && waitret == WAIT_OBJECT_0 + 1)
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{
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DOSVM_ProcessConsole();
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}
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else if (waitret == WAIT_OBJECT_0 + objc)
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{
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MSG msg;
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while (PeekMessageA(&msg,0,0,0,PM_REMOVE|PM_NOYIELD))
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{
|
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/* got a message */
|
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DOSVM_ProcessMessage(&msg);
|
|
/* we don't need a TranslateMessage here */
|
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DispatchMessageA(&msg);
|
|
}
|
|
}
|
|
else
|
|
{
|
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ERR_(module)( "dosvm wait error=%d\n", GetLastError() );
|
|
}
|
|
}
|
|
}
|
|
|
|
|
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DWORD DOSVM_Loop( HANDLE hThread )
|
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{
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HANDLE objs[2];
|
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int count = 0;
|
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MSG msg;
|
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DWORD waitret;
|
|
|
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objs[count++] = hThread;
|
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if (GetConsoleMode( GetStdHandle(STD_INPUT_HANDLE), NULL ))
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objs[count++] = GetStdHandle(STD_INPUT_HANDLE);
|
|
|
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for(;;) {
|
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TRACE_(int)("waiting for action\n");
|
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waitret = MsgWaitForMultipleObjects(count, objs, FALSE, INFINITE, QS_ALLINPUT);
|
|
if (waitret == WAIT_OBJECT_0) {
|
|
DWORD rv;
|
|
if(!GetExitCodeThread(hThread, &rv)) {
|
|
ERR("Failed to get thread exit code!\n");
|
|
rv = 0;
|
|
}
|
|
return rv;
|
|
}
|
|
else if (waitret == WAIT_OBJECT_0 + count) {
|
|
while (PeekMessageA(&msg,0,0,0,PM_REMOVE)) {
|
|
if (msg.hwnd) {
|
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/* it's a window message */
|
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DOSVM_ProcessMessage(&msg);
|
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DispatchMessageA(&msg);
|
|
} else {
|
|
/* it's a thread message */
|
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switch (msg.message) {
|
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case WM_QUIT:
|
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/* stop this madness!! */
|
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return 0;
|
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case WM_USER:
|
|
/* run passed procedure in this thread */
|
|
/* (sort of like APC, but we signal the completion) */
|
|
{
|
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DOS_SPC *spc = (DOS_SPC *)msg.lParam;
|
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TRACE_(int)("calling %p with arg %08lx\n", spc->proc, spc->arg);
|
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(spc->proc)(spc->arg);
|
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TRACE_(int)("done, signalling event %lx\n", msg.wParam);
|
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SetEvent( (HANDLE)msg.wParam );
|
|
}
|
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break;
|
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default:
|
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DispatchMessageA(&msg);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (waitret == WAIT_OBJECT_0 + 1)
|
|
{
|
|
DOSVM_ProcessConsole();
|
|
}
|
|
else
|
|
{
|
|
ERR_(int)("MsgWaitForMultipleObjects returned unexpected value.\n");
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static LONG WINAPI exception_handler(EXCEPTION_POINTERS *eptr)
|
|
{
|
|
EXCEPTION_RECORD *rec = eptr->ExceptionRecord;
|
|
CONTEXT *context = eptr->ContextRecord;
|
|
int arg = rec->ExceptionInformation[0];
|
|
BOOL ret;
|
|
|
|
switch(rec->ExceptionCode) {
|
|
case EXCEPTION_VM86_INTx:
|
|
TRACE_(relay)("Call DOS int 0x%02x ret=%04x:%04x\n"
|
|
" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
|
|
" ebp=%08x esp=%08x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
|
|
arg, context->SegCs, context->Eip,
|
|
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi,
|
|
context->Ebp, context->Esp, context->SegDs, context->SegEs, context->SegFs, context->SegGs,
|
|
context->EFlags );
|
|
ret = DOSVM_EmulateInterruptRM( context, arg );
|
|
TRACE_(relay)("Ret DOS int 0x%02x ret=%04x:%04x\n"
|
|
" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
|
|
" ebp=%08x esp=%08x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
|
|
arg, context->SegCs, context->Eip,
|
|
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi,
|
|
context->Ebp, context->Esp, context->SegDs, context->SegEs,
|
|
context->SegFs, context->SegGs, context->EFlags );
|
|
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
|
|
|
|
case EXCEPTION_VM86_STI:
|
|
/* case EXCEPTION_VM86_PICRETURN: */
|
|
if (!ISV86(context))
|
|
ERR( "Protected mode STI caught by real mode handler!\n" );
|
|
DOSVM_SendQueuedEvents(context);
|
|
return EXCEPTION_CONTINUE_EXECUTION;
|
|
|
|
case EXCEPTION_SINGLE_STEP:
|
|
ret = DOSVM_EmulateInterruptRM( context, 1 );
|
|
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
|
|
|
|
case EXCEPTION_BREAKPOINT:
|
|
ret = DOSVM_EmulateInterruptRM( context, 3 );
|
|
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
|
|
|
|
}
|
|
return EXCEPTION_CONTINUE_SEARCH;
|
|
}
|
|
|
|
INT DOSVM_Enter( CONTEXT86 *context )
|
|
{
|
|
INT ret = 0;
|
|
if (!ISV86(context))
|
|
ERR( "Called with protected mode context!\n" );
|
|
|
|
__TRY
|
|
{
|
|
if (!WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)context )) ret = -1;
|
|
TRACE_(module)( "ret %d err %u\n", ret, GetLastError() );
|
|
}
|
|
__EXCEPT(exception_handler)
|
|
{
|
|
TRACE_(module)( "leaving vm86 mode\n" );
|
|
}
|
|
__ENDTRY
|
|
|
|
return ret;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSVM_PIC_ioport_out
|
|
*/
|
|
void DOSVM_PIC_ioport_out( WORD port, BYTE val)
|
|
{
|
|
if (port != 0x20)
|
|
{
|
|
FIXME( "Unsupported PIC port %04x\n", port );
|
|
}
|
|
else if (val == 0x20 || (val >= 0x60 && val <= 0x67))
|
|
{
|
|
EnterCriticalSection(&qcrit);
|
|
|
|
if (!current_event)
|
|
{
|
|
WARN( "%s without active IRQ\n",
|
|
val == 0x20 ? "EOI" : "Specific EOI" );
|
|
}
|
|
else if (val != 0x20 && val - 0x60 != current_event->irq)
|
|
{
|
|
WARN( "Specific EOI but current IRQ %d is not %d\n",
|
|
current_event->irq, val - 0x60 );
|
|
}
|
|
else
|
|
{
|
|
LPDOSEVENT event = current_event;
|
|
|
|
TRACE( "Received %s for current IRQ %d, clearing event\n",
|
|
val == 0x20 ? "EOI" : "Specific EOI", event->irq );
|
|
|
|
current_event = event->next;
|
|
if (event->relay)
|
|
(*event->relay)(NULL,event->data);
|
|
HeapFree(GetProcessHeap(), 0, event);
|
|
|
|
if (DOSVM_HasPendingEvents())
|
|
{
|
|
TRACE( "Another event pending, setting pending flag\n" );
|
|
get_vm86_teb_info()->vm86_pending |= VIP_MASK;
|
|
}
|
|
}
|
|
|
|
LeaveCriticalSection(&qcrit);
|
|
}
|
|
else
|
|
{
|
|
FIXME( "Unrecognized PIC command %02x\n", val );
|
|
}
|
|
}
|
|
|
|
#else /* !MZ_SUPPORTED */
|
|
|
|
/***********************************************************************
|
|
* DOSVM_Enter
|
|
*/
|
|
INT DOSVM_Enter( CONTEXT86 *context )
|
|
{
|
|
SetLastError( ERROR_NOT_SUPPORTED );
|
|
return -1;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* DOSVM_Wait
|
|
*/
|
|
void DOSVM_Wait( CONTEXT86 *waitctx ) { }
|
|
|
|
/***********************************************************************
|
|
* DOSVM_PIC_ioport_out
|
|
*/
|
|
void DOSVM_PIC_ioport_out( WORD port, BYTE val) {}
|
|
|
|
/***********************************************************************
|
|
* DOSVM_QueueEvent
|
|
*/
|
|
void DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
|
|
{
|
|
if (irq<0) {
|
|
/* callback event, perform it with dummy context */
|
|
CONTEXT86 context;
|
|
memset(&context,0,sizeof(context));
|
|
(*relay)(&context,data);
|
|
} else {
|
|
ERR("IRQ without DOS task: should not happen\n");
|
|
}
|
|
}
|
|
|
|
#endif /* MZ_SUPPORTED */
|
|
|
|
|
|
/**********************************************************************
|
|
* DOSVM_AcknowledgeIRQ
|
|
*
|
|
* This routine should be called by all internal IRQ handlers.
|
|
*/
|
|
void WINAPI DOSVM_AcknowledgeIRQ( CONTEXT86 *context )
|
|
{
|
|
/*
|
|
* Send EOI to PIC.
|
|
*/
|
|
DOSVM_PIC_ioport_out( 0x20, 0x20 );
|
|
|
|
/*
|
|
* Protected mode IRQ handlers are supposed
|
|
* to turn VIF flag on before they return.
|
|
*/
|
|
if (!ISV86(context))
|
|
get_vm86_teb_info()->dpmi_vif = 1;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSVM_AllocUMB
|
|
*
|
|
* Allocate upper memory block (UMB) from upper memory.
|
|
* Returned pointer is aligned to 16-byte (paragraph) boundary.
|
|
*
|
|
* This routine is only for allocating static storage for
|
|
* Wine internal uses. Allocated memory can be accessed from
|
|
* real mode, memory is taken from area already mapped and reserved
|
|
* by Wine and the allocation has very little memory and speed
|
|
* overhead. Use of this routine also preserves precious DOS
|
|
* conventional memory.
|
|
*/
|
|
static LPVOID DOSVM_AllocUMB( DWORD size )
|
|
{
|
|
LPVOID ptr = (LPVOID)DOSVM_umb_free;
|
|
|
|
size = ((size + 15) >> 4) << 4;
|
|
|
|
if(DOSVM_umb_free + size - 1 > DOSVM_UMB_TOP) {
|
|
ERR("Out of upper memory area.\n");
|
|
return 0;
|
|
}
|
|
|
|
DOSVM_umb_free += size;
|
|
return ptr;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* alloc_selector
|
|
*
|
|
* Allocate a selector corresponding to a real mode address.
|
|
* size must be < 64k.
|
|
*/
|
|
static WORD alloc_selector( void *base, DWORD size, unsigned char flags )
|
|
{
|
|
WORD sel = wine_ldt_alloc_entries( 1 );
|
|
|
|
if (sel)
|
|
{
|
|
LDT_ENTRY entry;
|
|
wine_ldt_set_base( &entry, base );
|
|
wine_ldt_set_limit( &entry, size - 1 );
|
|
wine_ldt_set_flags( &entry, flags );
|
|
wine_ldt_set_entry( sel, &entry );
|
|
}
|
|
return sel;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSVM_AllocCodeUMB
|
|
*
|
|
* Allocate upper memory block for storing code stubs.
|
|
* Initializes real mode segment and 16-bit protected mode selector
|
|
* for the allocated code block.
|
|
*
|
|
* FIXME: should allocate a single PM selector for the whole UMB range.
|
|
*/
|
|
static LPVOID DOSVM_AllocCodeUMB( DWORD size, WORD *segment, WORD *selector )
|
|
{
|
|
LPVOID ptr = DOSVM_AllocUMB( size );
|
|
|
|
if (segment)
|
|
*segment = (DWORD)ptr >> 4;
|
|
|
|
if (selector)
|
|
*selector = alloc_selector( ptr, size, WINE_LDT_FLAGS_CODE );
|
|
|
|
return ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSVM_AllocDataUMB
|
|
*
|
|
* Allocate upper memory block for storing data.
|
|
* Initializes real mode segment and 16-bit protected mode selector
|
|
* for the allocated data block.
|
|
*/
|
|
LPVOID DOSVM_AllocDataUMB( DWORD size, WORD *segment, WORD *selector )
|
|
{
|
|
LPVOID ptr = DOSVM_AllocUMB( size );
|
|
|
|
if (segment)
|
|
*segment = (DWORD)ptr >> 4;
|
|
|
|
if (selector)
|
|
*selector = alloc_selector( ptr, size, WINE_LDT_FLAGS_DATA );
|
|
|
|
return ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* DOSVM_InitSegments
|
|
*
|
|
* Initializes DOSVM_dpmi_segments. Allocates required memory and
|
|
* sets up segments and selectors for accessing the memory.
|
|
*/
|
|
void DOSVM_InitSegments(void)
|
|
{
|
|
LPSTR ptr;
|
|
int i;
|
|
|
|
static const char wrap_code[]={
|
|
0xCD,0x31, /* int $0x31 */
|
|
0xCB /* lret */
|
|
};
|
|
|
|
static const char enter_xms[]=
|
|
{
|
|
/* XMS hookable entry point */
|
|
0xEB,0x03, /* jmp entry */
|
|
0x90,0x90,0x90, /* nop;nop;nop */
|
|
/* entry: */
|
|
/* real entry point */
|
|
/* for simplicity, we'll just use the same hook as DPMI below */
|
|
0xCD,0x31, /* int $0x31 */
|
|
0xCB /* lret */
|
|
};
|
|
|
|
static const char enter_pm[]=
|
|
{
|
|
0x50, /* pushw %ax */
|
|
0x52, /* pushw %dx */
|
|
0x55, /* pushw %bp */
|
|
0x89,0xE5, /* movw %sp,%bp */
|
|
/* get return CS */
|
|
0x8B,0x56,0x08, /* movw 8(%bp),%dx */
|
|
/* just call int 31 here to get into protected mode... */
|
|
/* it'll check whether it was called from dpmi_seg... */
|
|
0xCD,0x31, /* int $0x31 */
|
|
/* we are now in the context of a 16-bit relay call */
|
|
/* need to fixup our stack;
|
|
* 16-bit relay return address will be lost,
|
|
* but we won't worry quite yet
|
|
*/
|
|
0x8E,0xD0, /* movw %ax,%ss */
|
|
0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
|
|
/* set return CS */
|
|
0x89,0x56,0x08, /* movw %dx,8(%bp) */
|
|
0x5D, /* popw %bp */
|
|
0x5A, /* popw %dx */
|
|
0x58, /* popw %ax */
|
|
0xfb, /* sti, enable and check virtual interrupts */
|
|
0xCB /* lret */
|
|
};
|
|
|
|
static const char relay[]=
|
|
{
|
|
0xca, 0x04, 0x00, /* 16-bit far return and pop 4 bytes (relay void* arg) */
|
|
0xcd, 0x31, /* int 31 */
|
|
0xfb, 0x66, 0xcb /* sti and 32-bit far return */
|
|
};
|
|
|
|
/*
|
|
* Allocate pointer array.
|
|
*/
|
|
DOSVM_dpmi_segments = DOSVM_AllocUMB( sizeof(struct DPMI_segments) );
|
|
|
|
/*
|
|
* RM / offset 0: Exit from real mode.
|
|
* RM / offset 2: Points to lret opcode.
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( sizeof(wrap_code),
|
|
&DOSVM_dpmi_segments->wrap_seg, 0 );
|
|
memcpy( ptr, wrap_code, sizeof(wrap_code) );
|
|
|
|
/*
|
|
* RM / offset 0: XMS driver entry.
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( sizeof(enter_xms),
|
|
&DOSVM_dpmi_segments->xms_seg, 0 );
|
|
memcpy( ptr, enter_xms, sizeof(enter_xms) );
|
|
|
|
/*
|
|
* RM / offset 0: Switch to DPMI.
|
|
* PM / offset 8: DPMI raw mode switch.
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( sizeof(enter_pm),
|
|
&DOSVM_dpmi_segments->dpmi_seg,
|
|
&DOSVM_dpmi_segments->dpmi_sel );
|
|
memcpy( ptr, enter_pm, sizeof(enter_pm) );
|
|
|
|
/*
|
|
* PM / offset N*6: Interrupt N in DPMI32.
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( 6 * 256,
|
|
0, &DOSVM_dpmi_segments->int48_sel );
|
|
for(i=0; i<256; i++) {
|
|
/*
|
|
* Each 32-bit interrupt handler is 6 bytes:
|
|
* 0xCD,<i> = int <i> (nested 16-bit interrupt)
|
|
* 0x66,0xCA,0x04,0x00 = ret 4 (32-bit far return and pop 4 bytes / eflags)
|
|
*/
|
|
ptr[i * 6 + 0] = 0xCD;
|
|
ptr[i * 6 + 1] = i;
|
|
ptr[i * 6 + 2] = 0x66;
|
|
ptr[i * 6 + 3] = 0xCA;
|
|
ptr[i * 6 + 4] = 0x04;
|
|
ptr[i * 6 + 5] = 0x00;
|
|
}
|
|
|
|
/*
|
|
* PM / offset N*5: Interrupt N in 16-bit protected mode.
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( 5 * 256,
|
|
0, &DOSVM_dpmi_segments->int16_sel );
|
|
for(i=0; i<256; i++) {
|
|
/*
|
|
* Each 16-bit interrupt handler is 5 bytes:
|
|
* 0xCD,<i> = int <i> (interrupt)
|
|
* 0xCA,0x02,0x00 = ret 2 (16-bit far return and pop 2 bytes / eflags)
|
|
*/
|
|
ptr[i * 5 + 0] = 0xCD;
|
|
ptr[i * 5 + 1] = i;
|
|
ptr[i * 5 + 2] = 0xCA;
|
|
ptr[i * 5 + 3] = 0x02;
|
|
ptr[i * 5 + 4] = 0x00;
|
|
}
|
|
|
|
/*
|
|
* PM / offset 0: Stub where __wine_call_from_16_regs returns.
|
|
* PM / offset 3: Stub which swaps back to 32-bit application code/stack.
|
|
* PM / offset 5: Stub which enables interrupts
|
|
*/
|
|
ptr = DOSVM_AllocCodeUMB( sizeof(relay),
|
|
0, &DOSVM_dpmi_segments->relay_code_sel);
|
|
memcpy( ptr, relay, sizeof(relay) );
|
|
|
|
/*
|
|
* Space for 16-bit stack used by relay code.
|
|
*/
|
|
ptr = DOSVM_AllocDataUMB( DOSVM_RELAY_DATA_SIZE,
|
|
0, &DOSVM_dpmi_segments->relay_data_sel);
|
|
memset( ptr, 0, DOSVM_RELAY_DATA_SIZE );
|
|
|
|
/*
|
|
* As we store code in UMB we should make sure it is executable
|
|
*/
|
|
VirtualProtect((void *)DOSVM_UMB_BOTTOM, DOSVM_UMB_TOP - DOSVM_UMB_BOTTOM, PAGE_EXECUTE_READWRITE, NULL);
|
|
|
|
event_notifier = CreateEventW(NULL, FALSE, FALSE, NULL);
|
|
}
|