mirror of
git://source.winehq.org/git/wine.git
synced 2024-11-02 13:27:35 +00:00
302 lines
6.9 KiB
C
302 lines
6.9 KiB
C
/*
|
|
* DOS Virtual Machine
|
|
*
|
|
* Copyright 1998 Ove Kåven
|
|
*/
|
|
|
|
#if defined(linux) && defined(__i386__)
|
|
|
|
#include "config.h"
|
|
|
|
/* apparently ELF images are usually loaded high anyway */
|
|
#ifndef __ELF__
|
|
/* if not, force dosmod at high addresses */
|
|
asm(".org 0x110000");
|
|
#endif /* __ELF__ */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <sys/stat.h>
|
|
#ifdef HAVE_SYS_MMAN_H
|
|
# include <sys/mman.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_VM86_H
|
|
# include <sys/vm86.h>
|
|
#endif
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#ifdef HAVE_SYS_PTRACE_H
|
|
# include <sys/ptrace.h>
|
|
#endif
|
|
#ifdef HAVE_SYS_WAIT_H
|
|
# include <sys/wait.h>
|
|
#endif
|
|
#include "dosmod.h"
|
|
|
|
/* FIXME: hack because libc vm86 may be the old syscall version */
|
|
|
|
#define SYS_vm86 166
|
|
|
|
static inline int vm86plus( int func, struct vm86plus_struct *ptr )
|
|
{
|
|
int res;
|
|
#ifdef __PIC__
|
|
__asm__ __volatile__( "pushl %%ebx\n\t"
|
|
"movl %2,%%ebx\n\t"
|
|
"int $0x80\n\t"
|
|
"popl %%ebx"
|
|
: "=a" (res)
|
|
: "0" (SYS_vm86),
|
|
"g" (func),
|
|
"c" (ptr) );
|
|
#else
|
|
__asm__ __volatile__("int $0x80"
|
|
: "=a" (res)
|
|
: "0" (SYS_vm86),
|
|
"b" (func),
|
|
"c" (ptr) );
|
|
#endif /* __PIC__ */
|
|
if (res >= 0) return res;
|
|
errno = -res;
|
|
return -1;
|
|
}
|
|
|
|
int XREAD(int fd,void*buf,int size) {
|
|
int res;
|
|
|
|
while (1) {
|
|
res = read(fd, buf, size);
|
|
if (res==size)
|
|
return res;
|
|
if (res==-1) {
|
|
if (errno==EINTR)
|
|
continue;
|
|
perror("dosmod read");
|
|
return -1;
|
|
}
|
|
if (res) /* don't print the EOF condition */
|
|
fprintf(stderr,"dosmod read only %d of %d bytes.\n",res,size);
|
|
return res;
|
|
}
|
|
}
|
|
int XWRITE(int fd,void*buf,int size) {
|
|
int res;
|
|
|
|
while (1) {
|
|
res = write(fd, buf, size);
|
|
if (res==size)
|
|
return res;
|
|
if (res==-1) {
|
|
if (errno==EINTR)
|
|
continue;
|
|
perror("dosmod write");
|
|
return -1;
|
|
}
|
|
fprintf(stderr,"dosmod write only %d of %d bytes.\n",res,size);
|
|
return res;
|
|
}
|
|
}
|
|
|
|
void set_timer(struct timeval*tim)
|
|
{
|
|
struct itimerval cur;
|
|
|
|
cur.it_interval=*tim;
|
|
cur.it_value=*tim;
|
|
setitimer(ITIMER_REAL,&cur,NULL);
|
|
}
|
|
|
|
void get_timer(struct timeval*tim)
|
|
{
|
|
struct itimerval cur;
|
|
|
|
getitimer(ITIMER_REAL,&cur);
|
|
*tim=cur.it_value;
|
|
}
|
|
|
|
volatile int sig_pend,sig_fatal=0,sig_alrm=0,sig_cb=0;
|
|
void*img;
|
|
struct vm86plus_struct VM86;
|
|
|
|
void sig_handler(int sig)
|
|
{
|
|
if (sig_pend) fprintf(stderr,"DOSMOD previous signal %d lost\n",sig_pend);
|
|
sig_pend=sig;
|
|
signal(sig,sig_handler);
|
|
}
|
|
|
|
void bad_handler(int sig)
|
|
{
|
|
if (sig!=SIGTERM) {
|
|
fprintf(stderr,"DOSMOD caught fatal signal %d\n",sig);
|
|
fprintf(stderr,"(Last known VM86 CS:IP was %04x:%04lx)\n",VM86.regs.cs,VM86.regs.eip);
|
|
}
|
|
sig_pend=sig; sig_fatal++;
|
|
signal(sig,bad_handler);
|
|
}
|
|
|
|
void alarm_handler(int sig)
|
|
{
|
|
sig_alrm++;
|
|
signal(sig,alarm_handler);
|
|
}
|
|
|
|
void cb_handler(int sig)
|
|
{
|
|
sig_cb++;
|
|
signal(sig,cb_handler);
|
|
}
|
|
|
|
int send_signal(void)
|
|
{
|
|
int ret=sig_pend; sig_pend=0;
|
|
if (!ret) {
|
|
if (sig_alrm) {
|
|
ret=SIGALRM; sig_alrm--;
|
|
} else {
|
|
ret=SIGUSR2; sig_cb--;
|
|
}
|
|
}
|
|
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
|
|
if (sig_fatal) return 1;
|
|
return 0;
|
|
}
|
|
|
|
int send_enter_reply(int ret)
|
|
{
|
|
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
|
|
if (XWRITE(1,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
|
|
switch (ret&0xff) {
|
|
case DOSMOD_SIGNAL:
|
|
return send_signal();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc,char**argv)
|
|
{
|
|
int mfd=open(argv[0],O_RDWR);
|
|
struct timeval tim;
|
|
mprot_info mpr;
|
|
int func,ret,idle;
|
|
off_t fofs=0;
|
|
pid_t ppid=getppid();
|
|
|
|
/* fprintf(stderr,"main is at %08lx, file is %s, fd=%d\n",(unsigned long)&main,argv[0],mfd); */
|
|
if (mfd<0) return 1;
|
|
/* Map in our DOS image at the start of the process address space */
|
|
if (argv[1]) {
|
|
/* Ulrich Weigand suggested mapping in the DOS image directly from the Wine
|
|
address space */
|
|
fofs=atol(argv[1]);
|
|
/* linux currently only allows mapping a process memory if it's being ptraced */
|
|
/* Linus doesn't like it, so this probably won't work in the future */
|
|
/* it doesn't even work for me right now */
|
|
kill(ppid,SIGSTOP);
|
|
ptrace(PTRACE_ATTACH,ppid,0,0);
|
|
waitpid(ppid,NULL,0);
|
|
}
|
|
img=mmap(NULL,0x110000,PROT_EXEC|PROT_READ|PROT_WRITE,MAP_FIXED|MAP_SHARED,mfd,fofs);
|
|
if (argv[1]) {
|
|
ptrace(PTRACE_DETACH,ppid,0,0);
|
|
kill(ppid,SIGCONT);
|
|
}
|
|
if (img==(void*)-1) {
|
|
fprintf(stderr,"DOS memory map failed, error=%s\n",strerror(errno));
|
|
fprintf(stderr,"in attempt to map %s, offset %08lX, length 110000, to offset 0\n",argv[0],fofs);
|
|
return 1;
|
|
}
|
|
/* initialize signals and system timer */
|
|
signal(SIGHUP,sig_handler);
|
|
signal(SIGINT,sig_handler);
|
|
signal(SIGUSR1,sig_handler);
|
|
signal(SIGUSR2,cb_handler);
|
|
signal(SIGALRM,alarm_handler);
|
|
|
|
signal(SIGQUIT,bad_handler);
|
|
signal(SIGILL,bad_handler);
|
|
signal(SIGBUS,bad_handler);
|
|
signal(SIGFPE,bad_handler);
|
|
signal(SIGSEGV,bad_handler);
|
|
signal(SIGTERM,bad_handler);
|
|
#if 0
|
|
tim.tv_sec=0; tim.tv_usec=54925;
|
|
set_timer(&tim);
|
|
#endif
|
|
/* report back to the main program that we're ready */
|
|
ret=3; /* dosmod protocol revision */
|
|
XWRITE(1,&ret,sizeof(ret));
|
|
/* context exchange loop */
|
|
idle=0;
|
|
do {
|
|
if (idle) {
|
|
while (1) {
|
|
int res;
|
|
/* parent is idle, transmit any signals (particularly SIGALRM) */
|
|
if (sig_pend||sig_alrm||sig_cb) {
|
|
ret=DOSMOD_SIGNAL;
|
|
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
|
|
ret=send_signal();
|
|
if (ret) return ret;
|
|
break;
|
|
}
|
|
res = read(0,&func,sizeof(func));
|
|
if (res==sizeof(func))
|
|
break;
|
|
if (res==-1) {
|
|
if (errno==EINTR)
|
|
continue;
|
|
perror("dosmod read");
|
|
return 1;
|
|
}
|
|
if (res) /* don't print the EOF condition */
|
|
fprintf(stderr,"dosmod read only %d of %d bytes.\n",res,sizeof(func));
|
|
return 1;
|
|
}
|
|
ret=DOSMOD_LEFTIDLE;
|
|
if (XWRITE(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
|
|
idle--;
|
|
} else
|
|
if (XREAD(0,&func,sizeof(func))!=sizeof(func)) return 1;
|
|
if (func<0) break;
|
|
switch (func) {
|
|
case DOSMOD_SET_TIMER: /* rev 1 */
|
|
if (XREAD(0,&tim,sizeof(tim))!=sizeof(tim)) return 1;
|
|
set_timer(&tim);
|
|
/* no response */
|
|
break;
|
|
case DOSMOD_GET_TIMER: /* rev 1 */
|
|
get_timer(&tim);
|
|
if (XWRITE(1,&tim,sizeof(tim))!=sizeof(tim)) return 1;
|
|
break;
|
|
case DOSMOD_MPROTECT: /* rev 3 */
|
|
if (XREAD(0,&mpr,sizeof(mpr))!=sizeof(mpr)) return 1;
|
|
mprotect(mpr.addr,mpr.len,mpr.prot);
|
|
/* no response */
|
|
break;
|
|
case DOSMOD_ENTERIDLE: /* rev 3 */
|
|
idle++;
|
|
break;
|
|
case DOSMOD_LEAVEIDLE: /* rev 3 */
|
|
break;
|
|
case DOSMOD_ENTER: /* rev 0 */
|
|
default:
|
|
if (XREAD(0,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
|
|
if (sig_pend||sig_alrm||sig_cb) ret=DOSMOD_SIGNAL; else
|
|
ret=vm86plus(func,&VM86);
|
|
|
|
ret=send_enter_reply(ret);
|
|
if (ret) return ret;
|
|
}
|
|
} while (1);
|
|
return 0;
|
|
}
|
|
|
|
#else /* !linux-i386 */
|
|
int main(void) {return 1;}
|
|
#endif
|