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Sweden-Number/loader/dos/dosvm.c

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/*
* DOS Virtual Machine
*
* Copyright 1998 Ove Kåven
*
* This code hasn't been completely cleaned up yet.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "wine/winbase16.h"
#include "winuser.h"
#include "winnt.h"
#include "msdos.h"
#include "file.h"
#include "miscemu.h"
#include "dosexe.h"
#include "dosmod.h"
#include "stackframe.h"
#include "debugtools.h"
DECLARE_DEBUG_CHANNEL(int)
DECLARE_DEBUG_CHANNEL(module)
DECLARE_DEBUG_CHANNEL(relay)
#ifdef MZ_SUPPORTED
#include <sys/vm86.h>
#include <sys/mman.h>
#define IF_CLR(ctx) EFL_reg(ctx) &= ~VIF_MASK
#define IF_ENABLED(ctx) (EFL_reg(ctx) & VIF_MASK)
#define SET_PEND(ctx) EFL_reg(ctx) |= VIP_MASK
#define CLR_PEND(ctx) EFL_reg(ctx) &= ~VIP_MASK
#define IS_PEND(ctx) (EFL_reg(ctx) & VIP_MASK)
#undef TRY_PICRETURN
extern void WINAPI REGS_FUNC(RtlRaiseException)( EXCEPTION_RECORD *rec,
CONTEXT *context );
static void do_exception( int signal, CONTEXT86 *context )
{
EXCEPTION_RECORD rec;
if ((signal == SIGTRAP) || (signal == SIGHUP))
{
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
}
else
{
rec.ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION; /* generic error */
rec.ExceptionFlags = EH_NONCONTINUABLE;
}
rec.ExceptionRecord = NULL;
rec.ExceptionAddress = (LPVOID)EIP_reg(context);
rec.NumberParameters = 0;
REGS_FUNC(RtlRaiseException)( &rec, context );
}
static void DOSVM_Dump( LPDOSTASK lpDosTask, int fn, int sig,
struct vm86plus_struct*VM86 )
{
unsigned iofs;
BYTE*inst;
int x;
switch (VM86_TYPE(fn)) {
case VM86_SIGNAL:
printf("Trapped signal %d\n",sig); break;
case VM86_UNKNOWN:
printf("Trapped unhandled GPF\n"); break;
case VM86_INTx:
printf("Trapped INT %02x\n",VM86_ARG(fn)); break;
case VM86_STI:
printf("Trapped STI\n"); break;
case VM86_PICRETURN:
printf("Trapped due to pending PIC request\n"); break;
case VM86_TRAP:
printf("Trapped debug request\n"); break;
default:
printf("Trapped unknown VM86 type %d arg %d\n",VM86_TYPE(fn),VM86_ARG(fn)); break;
}
#define REGS VM86->regs
fprintf(stderr,"AX=%04lX CX=%04lX DX=%04lX BX=%04lX\n",REGS.eax,REGS.ecx,REGS.edx,REGS.ebx);
fprintf(stderr,"SI=%04lX DI=%04lX SP=%04lX BP=%04lX\n",REGS.esi,REGS.edi,REGS.esp,REGS.ebp);
fprintf(stderr,"CS=%04X DS=%04X ES=%04X SS=%04X\n",REGS.cs,REGS.ds,REGS.es,REGS.ss);
fprintf(stderr,"IP=%04lX EFLAGS=%08lX\n",REGS.eip,REGS.eflags);
iofs=((DWORD)REGS.cs<<4)+REGS.eip;
#undef REGS
inst=(BYTE*)lpDosTask->img+iofs;
printf("Opcodes:");
for (x=0; x<8; x++) printf(" %02x",inst[x]);
printf("\n");
}
static int DOSVM_Int( int vect, CONTEXT86 *context, LPDOSTASK lpDosTask )
{
extern UINT16 DPMI_wrap_seg;
if (vect==0x31) {
if (CS_reg(context)==DPMI_wrap_seg) {
/* exit from real-mode wrapper */
return -1;
}
/* we could probably move some other dodgy stuff here too from dpmi.c */
}
INT_RealModeInterrupt(vect,context);
return 0;
}
static void DOSVM_SimulateInt( int vect, CONTEXT86 *context, LPDOSTASK lpDosTask )
{
FARPROC16 handler=INT_GetRMHandler(vect);
if (SELECTOROF(handler)==0xf000) {
/* if internal interrupt, call it directly */
INT_RealModeInterrupt(vect,context);
} else {
WORD*stack=(WORD*)(V86BASE(context)+(((DWORD)SS_reg(context))<<4)+LOWORD(ESP_reg(context)));
WORD flag=LOWORD(EFL_reg(context));
if (IF_ENABLED(context)) flag|=IF_MASK;
else flag&=~IF_MASK;
*(--stack)=flag;
*(--stack)=CS_reg(context);
*(--stack)=LOWORD(EIP_reg(context));
ESP_reg(context)-=6;
CS_reg(context)=SELECTOROF(handler);
EIP_reg(context)=OFFSETOF(handler);
IF_CLR(context);
}
}
#define SHOULD_PEND(x) \
(x && ((!lpDosTask->current) || (x->priority < lpDosTask->current->priority)))
static void DOSVM_SendQueuedEvent(CONTEXT86 *context, LPDOSTASK lpDosTask)
{
LPDOSEVENT event = lpDosTask->pending;
if (SHOULD_PEND(event)) {
/* remove from "pending" list */
lpDosTask->pending = event->next;
/* process event */
if (event->irq>=0) {
/* it's an IRQ, move it to "current" list */
event->next = lpDosTask->current;
lpDosTask->current = event;
TRACE_(int)("dispatching IRQ %d\n",event->irq);
/* note that if DOSVM_SimulateInt calls an internal interrupt directly,
* lpDosTask->current might be cleared (and event freed) in this very call! */
DOSVM_SimulateInt((event->irq<8)?(event->irq+8):(event->irq-8+0x70),context,lpDosTask);
} else {
/* callback event */
TRACE_(int)("dispatching callback event\n");
(*event->relay)(lpDosTask,context,event->data);
free(event);
}
}
if (!SHOULD_PEND(lpDosTask->pending)) {
TRACE_(int)("clearing Pending flag\n");
CLR_PEND(context);
}
}
static void DOSVM_SendQueuedEvents(CONTEXT86 *context, LPDOSTASK lpDosTask)
{
/* we will send all queued events as long as interrupts are enabled,
* but IRQ events will disable interrupts again */
while (IS_PEND(context) && IF_ENABLED(context))
DOSVM_SendQueuedEvent(context,lpDosTask);
}
void DOSVM_QueueEvent( int irq, int priority, void (*relay)(LPDOSTASK,CONTEXT86*,void*), void *data)
{
LPDOSTASK lpDosTask = MZ_Current();
LPDOSEVENT event, cur, prev;
if (lpDosTask) {
event = malloc(sizeof(DOSEVENT));
if (!event) {
ERR_(int)("out of memory allocating event entry\n");
return;
}
event->irq = irq; event->priority = priority;
event->relay = relay; event->data = data;
/* insert event into linked list, in order *after*
* all earlier events of higher or equal priority */
cur = lpDosTask->pending; prev = NULL;
while (cur && cur->priority<=priority) {
prev = cur;
cur = cur->next;
}
event->next = cur;
if (prev) prev->next = event;
else lpDosTask->pending = event;
/* get dosmod's attention to the new event, except for irq==0 where we already have it */
if (irq && !lpDosTask->sig_sent) {
TRACE_(int)("new event queued, signalling dosmod\n");
kill(lpDosTask->task,SIGUSR2);
lpDosTask->sig_sent++;
} else {
TRACE_(int)("new event queued\n");
}
}
}
#define CV CP(eax,EAX); CP(ecx,ECX); CP(edx,EDX); CP(ebx,EBX); \
CP(esi,ESI); CP(edi,EDI); CP(esp,ESP); CP(ebp,EBP); \
CP(cs,CS); CP(ds,DS); CP(es,ES); \
CP(ss,SS); CP(fs,FS); CP(gs,GS); \
CP(eip,EIP); CP(eflags,EFL)
static int DOSVM_Process( LPDOSTASK lpDosTask, int fn, int sig,
struct vm86plus_struct*VM86 )
{
CONTEXT86 context;
int ret=0;
#define CP(x,y) y##_reg(&context) = VM86->regs.x
CV;
#undef CP
if (VM86_TYPE(fn)==VM86_UNKNOWN) {
ret=INSTR_EmulateInstruction(&context);
#define CP(x,y) VM86->regs.x = y##_reg(&context)
CV;
#undef CP
if (ret) return 0;
ret=0;
}
(void*)V86BASE(&context)=lpDosTask->img;
#ifdef TRY_PICRETURN
if (VM86->vm86plus.force_return_for_pic) {
SET_PEND(&context);
}
#else
/* linux doesn't preserve pending flag on return */
if (SHOULD_PEND(lpDosTask->pending)) {
SET_PEND(&context);
}
#endif
switch (VM86_TYPE(fn)) {
case VM86_SIGNAL:
TRACE_(int)("DOS module caught signal %d\n",sig);
if ((sig==SIGALRM) || (sig==SIGUSR2)) {
if (sig==SIGALRM) {
DOSVM_QueueEvent(0,DOS_PRIORITY_REALTIME,NULL,NULL);
}
if (lpDosTask->pending) {
TRACE_(int)("setting Pending flag, interrupts are currently %s\n",
IF_ENABLED(&context) ? "enabled" : "disabled");
SET_PEND(&context);
DOSVM_SendQueuedEvents(&context,lpDosTask);
} else {
TRACE_(int)("no events are pending, clearing Pending flag\n");
CLR_PEND(&context);
}
if (sig==SIGUSR2) lpDosTask->sig_sent--;
}
else if ((sig==SIGHUP) || (sig==SIGILL) || (sig==SIGSEGV)) {
do_exception( sig, &context );
} else {
DOSVM_Dump(lpDosTask,fn,sig,VM86);
ret=-1;
}
break;
case VM86_UNKNOWN: /* unhandled GPF */
DOSVM_Dump(lpDosTask,fn,sig,VM86);
do_exception( SIGSEGV, &context );
break;
case VM86_INTx:
if (TRACE_ON(relay))
DPRINTF("Call DOS int 0x%02x (EAX=%08lx) ret=%04lx:%04lx\n",VM86_ARG(fn),context.Eax,context.SegCs,context.Eip);
ret=DOSVM_Int(VM86_ARG(fn),&context,lpDosTask);
if (TRACE_ON(relay))
DPRINTF("Ret DOS int 0x%02x (EAX=%08lx) ret=%04lx:%04lx\n",VM86_ARG(fn),context.Eax,context.SegCs,context.Eip);
break;
case VM86_STI:
case VM86_PICRETURN:
TRACE_(int)("DOS task enabled interrupts with events pending, sending events\n");
DOSVM_SendQueuedEvents(&context,lpDosTask);
break;
case VM86_TRAP:
do_exception( SIGTRAP, &context );
break;
default:
DOSVM_Dump(lpDosTask,fn,sig,VM86);
ret=-1;
}
#define CP(x,y) VM86->regs.x = y##_reg(&context)
CV;
#undef CP
#ifdef TRY_PICRETURN
VM86->vm86plus.force_return_for_pic = IS_PEND(&context) ? 1 : 0;
CLR_PEND(&context);
#endif
return ret;
}
void DOSVM_ProcessMessage(LPDOSTASK lpDosTask,MSG *msg)
{
BYTE scan = 0;
fprintf(stderr,"got message %04x, wparam=%08x, lparam=%08lx\n",msg->message,msg->wParam,msg->lParam);
if ((msg->message>=WM_MOUSEFIRST)&&
(msg->message<=WM_MOUSELAST)) {
INT_Int33Message(msg->message,msg->wParam,msg->lParam);
} else {
switch (msg->message) {
case WM_KEYUP:
scan = 0x80;
case WM_KEYDOWN:
scan |= (msg->lParam >> 16) & 0x7f;
/* check whether extended bit is set,
* and if so, queue the extension prefix */
if (msg->lParam & 0x1000000) {
/* FIXME: some keys (function keys) have
* extended bit set even when they shouldn't,
* should check for them */
INT_Int09SendScan(0xE0);
}
INT_Int09SendScan(scan);
break;
}
}
}
void DOSVM_Wait( int read_pipe, HANDLE hObject )
{
LPDOSTASK lpDosTask = MZ_Current();
MSG msg;
DWORD waitret;
BOOL got_msg = FALSE;
do {
/* check for messages (waste time before the response check below) */
while (PeekMessageA(&msg,0,0,0,PM_REMOVE|PM_NOYIELD)) {
/* got a message */
DOSVM_ProcessMessage(lpDosTask,&msg);
/* we don't need a TranslateMessage here */
DispatchMessageA(&msg);
got_msg = TRUE;
}
if (read_pipe == -1) {
if (got_msg) break;
} else {
fd_set readfds;
struct timeval timeout={0,0};
/* quick check for response from dosmod
* (faster than doing the full blocking wait, if data already available) */
FD_ZERO(&readfds); FD_SET(read_pipe,&readfds);
if (select(read_pipe+1,&readfds,NULL,NULL,&timeout)>0)
break;
}
/* check for data from win32 console device */
/* nothing yet, block while waiting for something to do */
waitret=MsgWaitForMultipleObjects(1,&hObject,FALSE,INFINITE,QS_ALLINPUT);
if (waitret==(DWORD)-1) {
ERR_(module)("dosvm wait error=%ld\n",GetLastError());
}
if (read_pipe != -1) {
if (waitret==WAIT_OBJECT_0) break;
}
} while (TRUE);
}
int DOSVM_Enter( CONTEXT86 *context )
{
LPDOSTASK lpDosTask = MZ_Current();
struct vm86plus_struct VM86;
int stat,len,sig;
if (!lpDosTask) {
/* MZ_CreateProcess or MZ_AllocDPMITask should have been called first */
ERR_(module)("dosmod has not been initialized!");
return -1;
}
if (context) {
#define CP(x,y) VM86.regs.x = y##_reg(context)
CV;
#undef CP
if (VM86.regs.eflags & IF_MASK)
VM86.regs.eflags |= VIF_MASK;
} else {
/* initial setup */
/* allocate standard DOS handles */
FILE_InitProcessDosHandles();
/* registers */
memset(&VM86,0,sizeof(VM86));
VM86.regs.cs=lpDosTask->init_cs;
VM86.regs.eip=lpDosTask->init_ip;
VM86.regs.ss=lpDosTask->init_ss;
VM86.regs.esp=lpDosTask->init_sp;
VM86.regs.ds=lpDosTask->psp_seg;
VM86.regs.es=lpDosTask->psp_seg;
VM86.regs.eflags=VIF_MASK;
/* hmm, what else do we need? */
}
/* main exchange loop */
do {
stat = VM86_ENTER;
errno = 0;
/* transmit VM86 structure to dosmod task */
if (write(lpDosTask->write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
ERR_(module)("dosmod sync lost, errno=%d, fd=%d, pid=%d\n",errno,lpDosTask->write_pipe,getpid());
return -1;
}
if (write(lpDosTask->write_pipe,&VM86,sizeof(VM86))!=sizeof(VM86)) {
ERR_(module)("dosmod sync lost, errno=%d\n",errno);
return -1;
}
/* wait for response, doing other things in the meantime */
DOSVM_Wait(lpDosTask->read_pipe, lpDosTask->hReadPipe);
/* read response */
while (1) {
if ((len=read(lpDosTask->read_pipe,&stat,sizeof(stat)))==sizeof(stat)) break;
if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
WARN_(module)("rereading dosmod return code due to errno=%d, result=%d\n",errno,len);
continue;
}
ERR_(module)("dosmod sync lost reading return code, errno=%d, result=%d\n",errno,len);
return -1;
}
TRACE_(module)("dosmod return code=%d\n",stat);
while (1) {
if ((len=read(lpDosTask->read_pipe,&VM86,sizeof(VM86)))==sizeof(VM86)) break;
if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
WARN_(module)("rereading dosmod VM86 structure due to errno=%d, result=%d\n",errno,len);
continue;
}
ERR_(module)("dosmod sync lost reading VM86 structure, errno=%d, result=%d\n",errno,len);
return -1;
}
if ((stat&0xff)==DOSMOD_SIGNAL) {
while (1) {
if ((len=read(lpDosTask->read_pipe,&sig,sizeof(sig)))==sizeof(sig)) break;
if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
WARN_(module)("rereading dosmod signal due to errno=%d, result=%d\n",errno,len);
continue;
}
ERR_(module)("dosmod sync lost reading signal, errno=%d, result=%d\n",errno,len);
return -1;
} while (0);
} else sig=0;
/* got response */
} while (DOSVM_Process(lpDosTask,stat,sig,&VM86)>=0);
if (context) {
#define CP(x,y) y##_reg(context) = VM86.regs.x
CV;
#undef CP
}
return 0;
}
void DOSVM_PIC_ioport_out( WORD port, BYTE val)
{
LPDOSTASK lpDosTask = MZ_Current();
LPDOSEVENT event;
if (lpDosTask) {
if ((port==0x20) && (val==0x20)) {
if (lpDosTask->current) {
/* EOI (End Of Interrupt) */
TRACE_(int)("received EOI for current IRQ, clearing\n");
event = lpDosTask->current;
lpDosTask->current = event->next;
if (event->relay)
(*event->relay)(lpDosTask,NULL,event->data);
free(event);
if (lpDosTask->pending &&
!lpDosTask->sig_sent) {
/* another event is pending, which we should probably
* be able to process now, so tell dosmod about it */
TRACE_(int)("another event pending, signalling dosmod\n");
kill(lpDosTask->task,SIGUSR2);
lpDosTask->sig_sent++;
}
} else {
WARN_(int)("EOI without active IRQ\n");
}
} else {
FIXME_(int)("unrecognized PIC command %02x\n",val);
}
}
}
void DOSVM_SetTimer( unsigned ticks )
{
LPDOSTASK lpDosTask = MZ_Current();
int stat=DOSMOD_SET_TIMER;
struct timeval tim;
if (lpDosTask) {
/* the PC clocks ticks at 1193180 Hz */
tim.tv_sec=0;
tim.tv_usec=((unsigned long long)ticks*1000000)/1193180;
/* sanity check */
if (!tim.tv_usec) tim.tv_usec=1;
if (write(lpDosTask->write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
ERR_(module)("dosmod sync lost, errno=%d\n",errno);
return;
}
if (write(lpDosTask->write_pipe,&tim,sizeof(tim))!=sizeof(tim)) {
ERR_(module)("dosmod sync lost, errno=%d\n",errno);
return;
}
/* there's no return */
}
}
unsigned DOSVM_GetTimer( void )
{
LPDOSTASK lpDosTask = MZ_Current();
int stat=DOSMOD_GET_TIMER;
struct timeval tim;
if (lpDosTask) {
if (write(lpDosTask->write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
ERR_(module)("dosmod sync lost, errno=%d\n",errno);
return 0;
}
/* read response */
while (1) {
if (read(lpDosTask->read_pipe,&tim,sizeof(tim))==sizeof(tim)) break;
if ((errno==EINTR)||(errno==EAGAIN)) continue;
ERR_(module)("dosmod sync lost, errno=%d\n",errno);
return 0;
}
return ((unsigned long long)tim.tv_usec*1193180)/1000000;
}
return 0;
}
void DOSVM_SetSystemData( int id, void *data )
{
LPDOSTASK lpDosTask = MZ_Current();
DOSSYSTEM *sys, *prev;
if (lpDosTask) {
sys = lpDosTask->sys;
prev = NULL;
while (sys && (sys->id != id)) {
prev = sys;
sys = sys->next;
}
if (sys) {
free(sys->data);
sys->data = data;
} else {
sys = malloc(sizeof(DOSSYSTEM));
sys->id = id;
sys->data = data;
sys->next = NULL;
if (prev) prev->next = sys;
else lpDosTask->sys = sys;
}
} else free(data);
}
void* DOSVM_GetSystemData( int id )
{
LPDOSTASK lpDosTask = MZ_Current();
DOSSYSTEM *sys;
if (lpDosTask) {
sys = lpDosTask->sys;
while (sys && (sys->id != id))
sys = sys->next;
if (sys)
return sys->data;
}
return NULL;
}
#else /* !MZ_SUPPORTED */
int DOSVM_Enter( CONTEXT86 *context )
{
ERR_(module)("DOS realmode not supported on this architecture!\n");
return -1;
}
void DOSVM_Wait( int read_pipe, HANDLE hObject) {}
void DOSVM_PIC_ioport_out( WORD port, BYTE val) {}
void DOSVM_SetTimer( unsigned ticks ) {}
unsigned DOSVM_GetTimer( void ) { return 0; }
void DOSVM_SetSystemData( int id, void *data ) { free(data); }
void* DOSVM_GetSystemData( int id ) { return NULL; }
void DOSVM_QueueEvent( int irq, int priority, void (*relay)(LPDOSTASK,CONTEXT86*,void*), void *data) {}
#endif
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