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vax1k_exec.c revision 1.2 
      1 /*	$NetBSD: vax1k_exec.c,v 1.2 2000/06/28 15:39:37 mrg 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 /*
     34  * Exec glue to provide compatibility with older NetBSD vax1k exectuables.
     35  *
     36  * Because NetBSD/vax now uses 4k page size, older binaries (that started
     37  * on an 1k boundary) cannot be mmap'ed. Therefore they are read in
     38  * (via vn_rdwr) as OMAGIC binaries and executed. This will use a little
     39  * bit more memory, but otherwise won't affect the execution speed.
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/proc.h>
     45 #include <sys/malloc.h>
     46 #include <sys/vnode.h>
     47 #include <sys/exec.h>
     48 #include <sys/resourcevar.h>
     49 
     50 #include <compat/vax1k/vax1k_exec.h>
     51 
     52 int	exec_vax1k_prep_anymagic
     53 	    __P((struct proc *, struct exec_package *, int));
     54 
     55 /*
     56  * exec_vax1k_makecmds(): Check if it's an a.out-format executable
     57  * with an vax1k magic number.
     58  *
     59  * Given a proc pointer and an exec package pointer, see if the referent
     60  * of the epp is in a.out format.  Just check 'standard' magic numbers for
     61  * this architecture.
     62  *
     63  * This function, in the former case, or the hook, in the latter, is
     64  * responsible for creating a set of vmcmds which can be used to build
     65  * the process's vm space and inserting them into the exec package.
     66  */
     67 
     68 int
     69 exec_vax1k_makecmds(p, epp)
     70 	struct proc *p;
     71 	struct exec_package *epp;
     72 {
     73 	u_long midmag, magic;
     74 	u_short mid;
     75 	int error;
     76 	struct exec *execp = epp->ep_hdr;
     77 
     78 	if (epp->ep_hdrvalid < sizeof(struct exec))
     79 		return ENOEXEC;
     80 
     81 	midmag = ntohl(execp->a_midmag);
     82 	mid = (midmag >> 16) & 0x3ff;
     83 	magic = midmag & 0xffff;
     84 
     85 	midmag = mid << 16 | magic;
     86 
     87 	switch (midmag) {
     88 	case (MID_VAX1K << 16) | ZMAGIC:
     89 		error = exec_vax1k_prep_anymagic(p, epp, 0);
     90 		break;
     91 
     92 	case (MID_VAX1K << 16) | NMAGIC:
     93 	case (MID_VAX1K << 16) | OMAGIC:
     94 		error = exec_vax1k_prep_anymagic(p, epp, sizeof(struct exec));
     95 		break;
     96 
     97 	default:
     98 		error = ENOEXEC;
     99 	}
    100 
    101 	if (error)
    102 		kill_vmcmds(&epp->ep_vmcmds);
    103 
    104 	return error;
    105 }
    106 
    107 /*
    108  * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package
    109  *
    110  * First, set of the various offsets/lengths in the exec package.
    111  * Note that all code is mapped RW; no protection, but because it is
    112  * only used for compatibility it won't hurt.
    113  *
    114  */
    115 int
    116 exec_vax1k_prep_anymagic(p, epp, off)
    117         struct proc *p;
    118         struct exec_package *epp;
    119 	int off;
    120 {
    121 	long etmp, tmp;
    122         struct exec *execp = epp->ep_hdr;
    123 
    124         epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1);
    125 	epp->ep_tsize = execp->a_text + execp->a_data;
    126 	epp->ep_daddr = epp->ep_tsize + epp->ep_taddr;
    127 	epp->ep_dsize = execp->a_bss;
    128         epp->ep_entry = execp->a_entry;
    129 
    130         /* set up command for text segment */
    131         NEW_VMCMD(&epp->ep_vmcmds, vax1k_map_readvn,
    132 	    epp->ep_tsize,  epp->ep_taddr, epp->ep_vp, off,
    133 	    VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
    134 
    135 	tmp = round_page(epp->ep_daddr);
    136 	etmp = execp->a_bss - (tmp - epp->ep_daddr);
    137 
    138         /* set up command for bss segment */
    139 	if (etmp > 0)
    140 	        NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, etmp, tmp, NULLVP, 0,
    141 		    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    142 
    143         return exec_aout_setup_stack(p, epp);
    144 }
    145