news-xdep.c

早期freebsd实现

/* Low level interface to ptrace, for GDB when running under Unix.
   Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifdef __GNUC__
/* Bad implement execle(3). It's depend for "/bin/cc".

   main()
   {
     printf("execle:\n");
     execle(FILE, ARGS, envp);
     exit(1);
   }

   GCC:
   link a6,#0
   pea LC5	; call printf
   jbsr _printf
   ;		; (not popd stack)
   pea _envp	; call execle
   clrl sp@-
   pea LC4
   pea LC4
   pea LC4
   pea LC3
   pea LC6
   jbsr _execle
   addw #32,sp	; delayed pop !!

   /bin/cc:
   link.l	fp,#L23
   movem.l	#L24,(sp)
   pea	L26		; call printf
   jbsr	_printf
   addq.l	#4,sp	; <--- popd stack !!
   pea	_envp		; call execle
   clr.l	-(sp)
   pea	L32
   
   */

execle(name, args)
     char *name, *args;
{
  register char	**env = &args;
  while (*env++)
    ;
  execve(name, (char **)&args, (char **)*env);
}
#endif