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freebsd_exec.c revision 1.1 
      1 /*	$NetBSD: freebsd_exec.c,v 1.1 1995/10/10 01:19:27 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993, 1994 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christopher G. Demetriou.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/param.h>
     34 #include <sys/systm.h>
     35 #include <sys/proc.h>
     36 #include <sys/malloc.h>
     37 #include <sys/vnode.h>
     38 #include <sys/exec.h>
     39 #include <sys/resourcevar.h>
     40 #include <vm/vm.h>
     41 
     42 #include <machine/freebsd_machdep.h>
     43 
     44 #include <compat/freebsd/freebsd_syscall.h>
     45 #include <compat/freebsd/freebsd_exec.h>
     46 
     47 extern struct sysent freebsd_sysent[];
     48 extern char *freebsd_syscallnames[];
     49 
     50 struct emul emul_freebsd = {
     51 	"freebsd",
     52 	NULL,
     53 	freebsd_sendsig,
     54 	FREEBSD_SYS_syscall,
     55 	FREEBSD_SYS_MAXSYSCALL,
     56 	freebsd_sysent,
     57 	freebsd_syscallnames,
     58 	0,
     59 	copyargs,
     60 	setregs,
     61 	freebsd_sigcode,
     62 	freebsd_esigcode,
     63 };
     64 
     65 /*
     66  * exec_aout_makecmds(): Check if it's an a.out-format executable.
     67  *
     68  * Given a proc pointer and an exec package pointer, see if the referent
     69  * of the epp is in a.out format.  First check 'standard' magic numbers for
     70  * this architecture.  If that fails, try a cpu-dependent hook.
     71  *
     72  * This function, in the former case, or the hook, in the latter, is
     73  * responsible for creating a set of vmcmds which can be used to build
     74  * the process's vm space and inserting them into the exec package.
     75  */
     76 
     77 int
     78 exec_freebsd_aout_makecmds(p, epp)
     79 	struct proc *p;
     80 	struct exec_package *epp;
     81 {
     82 	u_long midmag;
     83 	int error = ENOEXEC;
     84 	struct exec *execp = epp->ep_hdr;
     85 
     86 	if (epp->ep_hdrvalid < sizeof(struct exec))
     87 		return ENOEXEC;
     88 
     89 	midmag = FREEBSD_N_GETMID(*execp) << 16 | FREEBSD_N_GETMAGIC(*execp);
     90 
     91 	/* assume FreeBSD's MID_MACHINE and [ZQNO]MAGIC is same as NetBSD's */
     92 	switch (midmag) {
     93 	case (MID_MACHINE << 16) | ZMAGIC:
     94 		error = cpu_exec_aout_prep_oldzmagic(p, epp);
     95 		break;
     96 	case (MID_MACHINE << 16) | QMAGIC:
     97 		error = exec_aout_prep_zmagic(p, epp);
     98 		break;
     99 	case (MID_MACHINE << 16) | NMAGIC:
    100 		error = exec_aout_prep_nmagic(p, epp);
    101 		break;
    102 	case (MID_MACHINE << 16) | OMAGIC:
    103 		error = exec_aout_prep_omagic(p, epp);
    104 		break;
    105 	}
    106 	if (error == 0)
    107 		epp->ep_emul = &emul_freebsd;
    108 	else
    109 		kill_vmcmds(&epp->ep_vmcmds);
    110 
    111 	return error;
    112 }
    113