FreeBSD/Linux Kernel Cross Reference
sys/compat/vax1k/vax1k_exec.c

     /*      $NetBSD: vax1k_exec.c,v 1.15 2008/02/13 17:41:09 matt Exp $     */
     
     /*
      * Copyright (c) 1993, 1994 Christopher G. Demetriou
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Christopher G. Demetriou.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * Exec glue to provide compatibility with older NetBSD vax1k exectuables.
     *
     * Because NetBSD/vax now uses 4k page size, older binaries (that started
     * on an 1k boundary) cannot be mmap'ed. Therefore they are read in
     * (via vn_rdwr) as OMAGIC binaries and executed. This will use a little
     * bit more memory, but otherwise won't affect the execution speed.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: vax1k_exec.c,v 1.15 2008/02/13 17:41:09 matt Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/vnode.h>
    #include <sys/exec.h>
    #include <sys/resourcevar.h>
    
    #include <compat/vax1k/vax1k_exec.h>
    
    #if defined(_KERNEL_OPT)
    #include "opt_compat_43.h"
    #else
    #define COMPAT_43       /* enable 4.3BSD binaries for lkm */
    #endif
    
    int     exec_vax1k_prep_anymagic(struct lwp *, struct exec_package *,
                size_t, bool);
    
    /*
     * exec_vax1k_makecmds(): Check if it's an a.out-format executable
     * with an vax1k magic number.
     *
     * Given a proc pointer and an exec package pointer, see if the referent
     * of the epp is in a.out format.  Just check 'standard' magic numbers for
     * this architecture.
     *
     * This function, in the former case, or the hook, in the latter, is
     * responsible for creating a set of vmcmds which can be used to build
     * the process's vm space and inserting them into the exec package.
     */
    
    int
    exec_vax1k_makecmds(struct lwp *l, struct exec_package *epp)
    {
            u_long midmag, magic;
            u_short mid;
            int error;
            struct exec *execp = epp->ep_hdr;
    
            if (epp->ep_hdrvalid < sizeof(struct exec))
                    return ENOEXEC;
    
            midmag = ntohl(execp->a_midmag);
            mid = (midmag >> 16) & 0x3ff;
            magic = midmag & 0xffff;
    
            midmag = mid << 16 | magic;
    
            switch (midmag) {
            case (MID_VAX1K << 16) | ZMAGIC:
                    error = exec_vax1k_prep_anymagic(l, epp, 0, false);
                    goto done;
    
            case (MID_VAX1K << 16) | NMAGIC:
                   error = exec_vax1k_prep_anymagic(l, epp,
                                                    sizeof(struct exec), true);
                   goto done;
   
           case (MID_VAX1K << 16) | OMAGIC:
                   error = exec_vax1k_prep_anymagic(l, epp,
                                                    sizeof(struct exec), false);
                   goto done;
           }
   
   #ifdef COMPAT_43
           /*
            * 4.3BSD pre-dates CPU midmag (e.g. MID_VAX1K).   instead, we
            * expect a magic number in native byte order.
            */
           switch (execp->a_midmag) {
           case ZMAGIC:
                   error = exec_vax1k_prep_anymagic(l, epp, VAX1K_LDPGSZ, false);
                   goto done;
   
           case NMAGIC:
                   error = exec_vax1k_prep_anymagic(l, epp,
                                                   sizeof(struct exec), true);
                   goto done;
   
           case OMAGIC:
                   error = exec_vax1k_prep_anymagic(l, epp,
                                                   sizeof(struct exec), false);
                   goto done;
           }
   #endif
   
           /* failed... */
           error = ENOEXEC;
   
   done:
           if (error)
                   kill_vmcmds(&epp->ep_vmcmds);
   
           return error;
   }
   
   /*
    * exec_vax1k_prep_anymagic(): Prepare an vax1k ?MAGIC binary's exec package
    *
    * First, set of the various offsets/lengths in the exec package.
    * Note that all code is mapped RW; no protection, but because it is
    * only used for compatibility it won't hurt.
    *
    */
   int
   exec_vax1k_prep_anymagic(struct lwp *l, struct exec_package *epp,
           size_t text_foffset, bool textpad)
   {
           struct exec *execp = epp->ep_hdr;
   
           epp->ep_taddr = execp->a_entry & ~(VAX1K_USRTEXT - 1);
           epp->ep_tsize = execp->a_text;
           epp->ep_daddr = epp->ep_taddr + epp->ep_tsize;
           if (textpad)                    /* pad for NMAGIC? */
                   epp->ep_daddr = (epp->ep_daddr + (VAX1K_LDPGSZ - 1)) &
                                                   ~(VAX1K_LDPGSZ - 1);
           epp->ep_dsize = execp->a_data;
           epp->ep_entry = execp->a_entry;
   
           /* first allocate memory for text+data+bss */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero,
                   round_page(epp->ep_daddr + epp->ep_dsize + execp->a_bss) -
                           trunc_page(epp->ep_taddr),      /* size */
                   trunc_page(epp->ep_taddr), NULLVP,      /* addr, vnode */
                   0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* then read the text in the area we just allocated */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
                   epp->ep_tsize, epp->ep_taddr, epp->ep_vp, text_foffset,
           VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
   
           /* next read the data */
           if (epp->ep_dsize) {
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_readvn,
                           epp->ep_dsize, epp->ep_daddr, epp->ep_vp,
                           text_foffset + epp->ep_tsize,
                           VM_PROT_WRITE|VM_PROT_READ|VM_PROT_EXECUTE);
           }
   
           /* now bump up the dsize to include the bss so that sbrk works */
           epp->ep_dsize += execp->a_bss;
   
           /* finally, setup the stack ... */
           return (*epp->ep_esch->es_setup_stack)(l, epp);
   }

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