The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/exec_ecoff.c

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    1 /*      $NetBSD: exec_ecoff.c,v 1.23 2003/08/08 18:53:13 christos Exp $ */
    2 
    3 /*
    4  * Copyright (c) 1994 Adam Glass
    5  * Copyright (c) 1993, 1994, 1996, 1999 Christopher G. Demetriou
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Christopher G. Demetriou
   19  *      for the NetBSD Project.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __KERNEL_RCSID(0, "$NetBSD: exec_ecoff.c,v 1.23 2003/08/08 18:53:13 christos Exp $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/proc.h>
   41 #include <sys/malloc.h>
   42 #include <sys/vnode.h>
   43 #include <sys/exec.h>
   44 #include <sys/resourcevar.h>
   45 
   46 #include <sys/exec_ecoff.h>
   47 
   48 /*
   49  * exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
   50  *
   51  * Given a proc pointer and an exec package pointer, see if the referent
   52  * of the epp is in ecoff format.  Check 'standard' magic numbers for
   53  * this architecture.  If that fails, return failure.
   54  *
   55  * This function is  responsible for creating a set of vmcmds which can be
   56  * used to build the process's vm space and inserting them into the exec
   57  * package.
   58  */
   59 int
   60 exec_ecoff_makecmds(struct proc *p, struct exec_package *epp)
   61 {
   62         int error;
   63         struct ecoff_exechdr *execp = epp->ep_hdr;
   64 
   65         if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
   66                 return ENOEXEC;
   67 
   68         if (ECOFF_BADMAG(execp))
   69                 return ENOEXEC;
   70 
   71         error = (*epp->ep_esch->u.ecoff_probe_func)(p, epp);
   72 
   73         /*
   74          * if there was an error or there are already vmcmds set up,
   75          * we return.  (the latter can happen if cpu_exec_ecoff_hook()
   76          * recursively invokes check_exec() to handle loading of a
   77          * dynamically linked binary's shared loader.
   78          */
   79         if (error || epp->ep_vmcmds.evs_cnt)
   80                 return (error);
   81 
   82         /*
   83          * prepare the exec package to map the executable.
   84          */
   85         switch (execp->a.magic) {
   86         case ECOFF_OMAGIC:
   87                 error = exec_ecoff_prep_omagic(p, epp, epp->ep_hdr,
   88                    epp->ep_vp);
   89                 break;
   90         case ECOFF_NMAGIC:
   91                 error = exec_ecoff_prep_nmagic(p, epp, epp->ep_hdr, 
   92                    epp->ep_vp);
   93                 break;
   94         case ECOFF_ZMAGIC:
   95                 error = exec_ecoff_prep_zmagic(p, epp, epp->ep_hdr,
   96                    epp->ep_vp);
   97                 break;
   98         default:
   99                 return ENOEXEC;
  100         }
  101 
  102         /* set up the stack */
  103         if (!error)
  104                 error = (*epp->ep_esch->es_setup_stack)(p, epp);
  105 
  106         if (error)
  107                 kill_vmcmds(&epp->ep_vmcmds);
  108 
  109         return error;
  110 }
  111 
  112 /*
  113  * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package
  114  */
  115 int
  116 exec_ecoff_prep_omagic(struct proc *p, struct exec_package *epp,
  117     struct ecoff_exechdr *execp, struct vnode *vp)
  118 {
  119         struct ecoff_aouthdr *eap = &execp->a;
  120 
  121         epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
  122         epp->ep_tsize = eap->tsize;
  123         epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
  124         epp->ep_dsize = eap->dsize + eap->bsize;
  125         epp->ep_entry = eap->entry;
  126 
  127         /* set up command for text and data segments */
  128         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
  129             eap->tsize + eap->dsize, epp->ep_taddr, vp,
  130             ECOFF_TXTOFF(execp),
  131             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  132 
  133         /* set up command for bss segment */
  134         if (eap->bsize > 0)
  135                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
  136                     ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
  137                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  138         
  139         return 0;
  140 }
  141 
  142 /*
  143  * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec
  144  *                           package.
  145  */
  146 int
  147 exec_ecoff_prep_nmagic(struct proc *p, struct exec_package *epp,
  148     struct ecoff_exechdr *execp, struct vnode *vp)
  149 {
  150         struct ecoff_aouthdr *eap = &execp->a;
  151 
  152         epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
  153         epp->ep_tsize = eap->tsize;
  154         epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ);
  155         epp->ep_dsize = eap->dsize + eap->bsize;
  156         epp->ep_entry = eap->entry;
  157 
  158         /* set up command for text segment */
  159         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize,
  160             epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
  161             VM_PROT_READ|VM_PROT_EXECUTE);
  162 
  163         /* set up command for data segment */
  164         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize,
  165             epp->ep_daddr, vp, ECOFF_DATOFF(execp),
  166             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  167 
  168         /* set up command for bss segment */
  169         if (eap->bsize > 0)
  170                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
  171                     ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
  172                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  173 
  174         return 0;
  175 }
  176 
  177 /*
  178  * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package
  179  *
  180  * First, set the various offsets/lengths in the exec package.
  181  *
  182  * Then, mark the text image busy (so it can be demand paged) or error
  183  * out if this is not possible.  Finally, set up vmcmds for the
  184  * text, data, bss, and stack segments.
  185  */
  186 int
  187 exec_ecoff_prep_zmagic(struct proc *p, struct exec_package *epp,
  188     struct ecoff_exechdr *execp, struct vnode *vp)
  189 {
  190         struct ecoff_aouthdr *eap = &execp->a;
  191         int error;
  192 
  193         epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
  194         epp->ep_tsize = eap->tsize;
  195         epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
  196         epp->ep_dsize = eap->dsize + eap->bsize;
  197         epp->ep_entry = eap->entry;
  198 
  199         error = vn_marktext(vp);
  200         if (error)
  201                 return (error);
  202 
  203         /* set up command for text segment */
  204         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize,
  205             epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
  206             VM_PROT_READ|VM_PROT_EXECUTE);
  207 
  208         /* set up command for data segment */
  209         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize,
  210             epp->ep_daddr, vp, ECOFF_DATOFF(execp),
  211             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  212 
  213         /* set up command for bss segment */
  214         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
  215             ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
  216             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  217 
  218         return 0;
  219 }

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