FreeBSD/Linux Kernel Cross Reference
sys/compat/common/compat_exec.c

     /*      $NetBSD: compat_exec.c,v 1.15 2007/12/08 18:35:53 dsl 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.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.15 2007/12/08 18:35:53 dsl Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/vnode.h>
    #include <sys/exec.h>
    #include <sys/resourcevar.h>
    
    /*
     * exec_aout_prep_oldzmagic():
     *      Prepare the vmcmds to build a vmspace for an old ZMAGIC
     *      binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
     *
     * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
     * description of operation is there.
     * There were copies of this in the mac68k, hp300, and i386 ports.
     */
    int
    exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp)
    {
            struct exec *execp = epp->ep_hdr;
            int error;
    
            epp->ep_taddr = 0;
            epp->ep_tsize = execp->a_text;
            epp->ep_daddr = epp->ep_taddr + execp->a_text;
            epp->ep_dsize = execp->a_data + execp->a_bss;
            epp->ep_entry = execp->a_entry;
    
            error = vn_marktext(epp->ep_vp);
            if (error)
                    return (error);
    
            /* set up command for text segment */
            NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
                epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */
                VM_PROT_READ|VM_PROT_EXECUTE);
    
            /* set up command for data segment */
            NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
                epp->ep_daddr, epp->ep_vp,
                execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */
                VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    
            /* set up command for bss segment */
            if (execp->a_bss)
                NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
                    epp->ep_daddr + execp->a_data, NULLVP, 0,
                    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
    
            return (*epp->ep_esch->es_setup_stack)(l, epp);
    }
    
    
    /*
     * exec_aout_prep_oldnmagic():
     *      Prepare the vmcmds to build a vmspace for an old NMAGIC
     *      binary. [BSDI]
     *
     * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
     * at 0.
     * XXX: There must be a better way to share this code.
     */
    int
    exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp)
   {
           struct exec *execp = epp->ep_hdr;
           long bsize, baddr;
   
           epp->ep_taddr = 0;
           epp->ep_tsize = execp->a_text;
           epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
           epp->ep_dsize = execp->a_data + execp->a_bss;
           epp->ep_entry = execp->a_entry;
   
           /* set up command for text segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
               epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
               VM_PROT_READ|VM_PROT_EXECUTE);
   
           /* set up command for data segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
               epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
               VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
           bsize = epp->ep_daddr + epp->ep_dsize - baddr;
           if (bsize > 0)
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
                       NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           return (*epp->ep_esch->es_setup_stack)(l, epp);
   }
   
   
   /*
    * exec_aout_prep_oldomagic():
    *      Prepare the vmcmds to build a vmspace for an old OMAGIC
    *      binary. [BSDI]
    *
    * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
    * at 0.
    * XXX: There must be a better way to share this code.
    */
   int
   exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp)
   {
           struct exec *execp = epp->ep_hdr;
           long dsize, bsize, baddr;
   
           epp->ep_taddr = 0;
           epp->ep_tsize = execp->a_text;
           epp->ep_daddr = epp->ep_taddr + execp->a_text;
           epp->ep_dsize = execp->a_data + execp->a_bss;
           epp->ep_entry = execp->a_entry;
   
           /* set up command for text and data segments */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
               execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
               sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
           bsize = epp->ep_daddr + epp->ep_dsize - baddr;
           if (bsize > 0)
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
                       NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /*
            * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
            * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
            * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
            * respectively to page boundaries.
            * Compensate `ep_dsize' for the amount of data covered by the last
            * text page.
            */
           dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
                                                           PAGE_SIZE);
           epp->ep_dsize = (dsize > 0) ? dsize : 0;
           return (*epp->ep_esch->es_setup_stack)(l, epp);
   }

Cache object: b78ef514dc15da863129433b84b3a12c