4 * Copyright 1998 Ove Kåven
7 #if defined(linux) && defined(__i386__)
9 /* apparently ELF images are usually loaded high anyway */
11 /* if not, force dosmod at high addresses */
26 #include <sys/types.h>
27 #include <sys/ptrace.h>
31 /* FIXME: hack because libc vm86 may be the old syscall version */
35 static __inline__ int vm86plus( int func, struct vm86plus_struct *ptr )
39 __asm__ __volatile__( "pushl %%ebx\n\t"
48 __asm__ __volatile__("int $0x80"
54 if (res >= 0) return res;
59 void set_timer(struct timeval*tim)
65 setitimer(ITIMER_REAL,&cur,NULL);
68 volatile int sig_pend,sig_fatal=0;
70 struct vm86plus_struct VM86;
72 void sig_handler(int sig)
74 if (sig_pend) fprintf(stderr,"DOSMOD previous signal %d lost\n",sig_pend);
76 signal(sig,sig_handler);
79 void bad_handler(int sig)
81 fprintf(stderr,"DOSMOD caught fatal signal %d\n",sig);
82 fprintf(stderr,"(Last known VM86 CS:IP was %04x:%04lx)\n",VM86.regs.cs,VM86.regs.eip);
83 sig_pend=sig; sig_fatal++;
84 signal(sig,bad_handler);
87 int main(int argc,char**argv)
89 int mfd=open(argv[0],O_RDWR);
95 /* fprintf(stderr,"main is at %08lx, file is %s, fd=%d\n",(unsigned long)&main,argv[0],mfd); */
97 /* Map in our DOS image at the start of the process address space */
99 /* Ulrich Weigand suggested mapping in the DOS image directly from the Wine
102 /* linux currently only allows mapping a process memory if it's being ptraced */
103 /* Linus doesn't like it, so this probably won't work in the future */
104 /* it doesn't even work for me right now */
106 ptrace(PTRACE_ATTACH,ppid,0,0);
107 waitpid(ppid,NULL,0);
109 img=mmap(NULL,0x110000,PROT_EXEC|PROT_READ|PROT_WRITE,MAP_FIXED|MAP_SHARED,mfd,fofs);
111 ptrace(PTRACE_DETACH,ppid,0,0);
114 if (img==(void*)-1) {
115 fprintf(stderr,"DOS memory map failed, error=%s\n",strerror(errno));
116 fprintf(stderr,"in attempt to map %s, offset %08lX, length 110000, to offset 0\n",argv[0],fofs);
119 /* initialize signals and system timer */
120 signal(SIGHUP,sig_handler);
121 signal(SIGINT,sig_handler);
122 signal(SIGUSR1,sig_handler);
123 signal(SIGUSR2,sig_handler);
124 signal(SIGALRM,sig_handler);
126 signal(SIGQUIT,bad_handler);
127 signal(SIGILL,bad_handler);
128 signal(SIGBUS,bad_handler);
129 signal(SIGFPE,bad_handler);
130 signal(SIGSEGV,bad_handler);
131 signal(SIGTERM,bad_handler);
133 tim.tv_sec=0; tim.tv_usec=54925;
136 /* report back to the main program that we're ready */
137 ret=1; /* dosmod protocol revision 1 */
138 write(1,&ret,sizeof(ret));
139 /* context exchange loop */
141 if (read(0,&func,sizeof(func))!=sizeof(func)) return 1;
144 case DOSMOD_SET_TIMER:
145 if (read(0,&tim,sizeof(tim))!=sizeof(tim)) return 1;
151 if (read(0,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
152 if (sig_pend) ret=DOSMOD_SIGNAL; else
153 ret=vm86plus(func,&VM86);
154 if (write(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
155 if (write(1,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
158 ret=sig_pend; sig_pend=0;
159 if (write(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
160 if (sig_fatal) return 1;
168 #else /* !linux-i386 */
169 int main(void) {return 1;}