4 * Copyright 1998 Ove Kåven
9 /* apparently ELF images are usually loaded high anyway */
11 /* if not, force dosmod at high addresses */
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
29 /* FIXME: hack because libc vm86 may be the old syscall version */
33 static __inline__ int vm86plus( int func, struct vm86plus_struct *ptr )
37 __asm__ __volatile__( "pushl %%ebx\n\t"
46 __asm__ __volatile__("int $0x80"
52 if (res >= 0) return res;
57 int main(int argc,char**argv)
59 int mfd=open(argv[0],O_RDWR);
61 struct vm86plus_struct VM86;
66 /* fprintf(stderr,"main is at %08lx, file is %s, fd=%d\n",(unsigned long)&main,argv[0],mfd); */
68 /* Map in our DOS image at the start of the process address space */
70 /* Ulrich Weigand suggested mapping in the DOS image directly from the Wine
73 /* linux currently only allows mapping a process memory if it's being ptraced */
74 /* Linus doesn't like it, so this probably won't work in the future */
75 /* it doesn't even work for me right now */
76 ptrace(PTRACE_ATTACH,ppid,0,0);
80 img=mmap(NULL,0x110000,PROT_EXEC|PROT_READ|PROT_WRITE,MAP_FIXED|MAP_SHARED,mfd,fofs);
82 ptrace(PTRACE_DETACH,ppid,0,0);
86 fprintf(stderr,"DOS memory map failed, error=%s\n",strerror(errno));
87 fprintf(stderr,"in attempt to map %s, offset %08lX, length 110000, to offset 0\n",argv[0],fofs);
90 /* fprintf(stderr,"Successfully mapped DOS memory, entering vm86 loop\n"); */
91 /* report back to the main program that we're ready */
93 write(1,&ret,sizeof(ret));
94 /* context exchange loop */
96 if (read(0,&func,sizeof(func))!=sizeof(func)) return 1;
97 if (read(0,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
99 ret=vm86plus(func,&VM86);
100 if (write(1,&ret,sizeof(ret))!=sizeof(ret)) return 1;
101 if (write(1,&VM86,sizeof(VM86))!=sizeof(VM86)) return 1;
107 int main(void) {return 1;}