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

     /*      $NetBSD: exec_ecoff.c,v 1.32 2019/11/20 19:37:53 pgoyette Exp $ */
     
     /*
      * Copyright (c) 1994 Adam Glass
      * Copyright (c) 1993, 1994, 1996, 1999 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
     *      for the NetBSD Project.
     * 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: exec_ecoff.c,v 1.32 2019/11/20 19:37:53 pgoyette 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>
    #include <sys/module.h>
    #include <sys/exec.h>
    #include <sys/exec_ecoff.h>
    
    MODULE(MODULE_CLASS_EXEC, exec_ecoff, NULL);
    
    static struct execsw exec_ecoff_execsw = {
            .es_hdrsz = ECOFF_HDR_SIZE,
            .es_makecmds = exec_ecoff_makecmds,
            .u = {
                    .ecoff_probe_func = cpu_exec_ecoff_probe,
            },
            .es_emul = &emul_netbsd,
            .es_prio = EXECSW_PRIO_ANY,
            .es_arglen = 0,
            .es_copyargs = copyargs,
            .es_setregs = cpu_exec_ecoff_setregs,
            .es_coredump = coredump_netbsd,
            .es_setup_stack = exec_setup_stack,
    };
    
    static int
    exec_ecoff_modcmd(modcmd_t cmd, void *arg)
    {
            switch (cmd) {
            case MODULE_CMD_INIT:
                    return exec_add(&exec_ecoff_execsw, 1);
    
            case MODULE_CMD_FINI:
                    return exec_remove(&exec_ecoff_execsw, 1);
    
            default:
                    return ENOTTY;
            }
    }
    
    /*
     * exec_ecoff_makecmds(): Check if it's an ecoff-format executable.
     *
     * Given a proc pointer and an exec package pointer, see if the referent
     * of the epp is in ecoff format.  Check 'standard' magic numbers for
     * this architecture.  If that fails, return failure.
     *
     * This function 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_ecoff_makecmds(struct lwp *l, struct exec_package *epp)
    {
            int error;
            struct ecoff_exechdr *execp = epp->ep_hdr;
    
            if (epp->ep_hdrvalid < ECOFF_HDR_SIZE)
                    return ENOEXEC;
    
           if (ECOFF_BADMAG(execp))
                   return ENOEXEC;
   
           error = (*epp->ep_esch->u.ecoff_probe_func)(l, epp);
   
           /*
            * if there was an error or there are already vmcmds set up,
            * we return.  (the latter can happen if cpu_exec_ecoff_hook()
            * recursively invokes check_exec() to handle loading of a
            * dynamically linked binary's shared loader.
            */
           if (error || epp->ep_vmcmds.evs_cnt)
                   return (error);
   
           /*
            * prepare the exec package to map the executable.
            */
           switch (execp->a.magic) {
           case ECOFF_OMAGIC:
                   error = exec_ecoff_prep_omagic(l, epp, epp->ep_hdr,
                      epp->ep_vp);
                   break;
           case ECOFF_NMAGIC:
                   error = exec_ecoff_prep_nmagic(l, epp, epp->ep_hdr,
                      epp->ep_vp);
                   break;
           case ECOFF_ZMAGIC:
                   error = exec_ecoff_prep_zmagic(l, epp, epp->ep_hdr,
                      epp->ep_vp);
                   break;
           default:
                   return ENOEXEC;
           }
   
           /* set up the stack */
           if (!error)
                   error = (*epp->ep_esch->es_setup_stack)(l, epp);
   
           if (error)
                   kill_vmcmds(&epp->ep_vmcmds);
   
           return error;
   }
   
   /*
    * exec_ecoff_prep_omagic(): Prepare a ECOFF OMAGIC binary's exec package
    */
   int
   exec_ecoff_prep_omagic(struct lwp *l, struct exec_package *epp,
       struct ecoff_exechdr *execp, struct vnode *vp)
   {
           struct ecoff_aouthdr *eap = &execp->a;
   
           epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
           epp->ep_tsize = eap->tsize;
           epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
           epp->ep_dsize = eap->dsize + eap->bsize;
           epp->ep_entry = eap->entry;
   
           /* set up command for text and data segments */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
               eap->tsize + eap->dsize, epp->ep_taddr, vp,
               ECOFF_TXTOFF(execp),
               VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           if (eap->bsize > 0)
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
                       ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
                       VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           return 0;
   }
   
   /*
    * exec_ecoff_prep_nmagic(): Prepare a 'native' NMAGIC ECOFF binary's exec
    *                           package.
    */
   int
   exec_ecoff_prep_nmagic(struct lwp *l, struct exec_package *epp,
       struct ecoff_exechdr *execp, struct vnode *vp)
   {
           struct ecoff_aouthdr *eap = &execp->a;
   
           epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
           epp->ep_tsize = eap->tsize;
           epp->ep_daddr = ECOFF_ROUND(eap->data_start, ECOFF_LDPGSZ);
           epp->ep_dsize = eap->dsize + eap->bsize;
           epp->ep_entry = eap->entry;
   
           /* set up command for text segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_tsize,
               epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
               VM_PROT_READ|VM_PROT_EXECUTE);
   
           /* set up command for data segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, epp->ep_dsize,
               epp->ep_daddr, vp, ECOFF_DATOFF(execp),
               VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           if (eap->bsize > 0)
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
                       ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
                       VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           return 0;
   }
   
   /*
    * exec_ecoff_prep_zmagic(): Prepare a ECOFF ZMAGIC binary's exec package
    *
    * First, set the various offsets/lengths in the exec package.
    *
    * Then, mark the text image busy (so it can be demand paged) or error
    * out if this is not possible.  Finally, set up vmcmds for the
    * text, data, bss, and stack segments.
    */
   int
   exec_ecoff_prep_zmagic(struct lwp *l, struct exec_package *epp,
       struct ecoff_exechdr *execp, struct vnode *vp)
   {
           struct ecoff_aouthdr *eap = &execp->a;
           int error;
   
           epp->ep_taddr = ECOFF_SEGMENT_ALIGN(execp, eap->text_start);
           epp->ep_tsize = eap->tsize;
           epp->ep_daddr = ECOFF_SEGMENT_ALIGN(execp, eap->data_start);
           epp->ep_dsize = eap->dsize + eap->bsize;
           epp->ep_entry = eap->entry;
   
           error = vn_marktext(vp);
           if (error)
                   return (error);
   
           /* set up command for text segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->tsize,
               epp->ep_taddr, vp, ECOFF_TXTOFF(execp),
               VM_PROT_READ|VM_PROT_EXECUTE);
   
           /* set up command for data segment */
           NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, eap->dsize,
               epp->ep_daddr, vp, ECOFF_DATOFF(execp),
               VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           if (eap->bsize > 0)
                   NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, eap->bsize,
                       ECOFF_SEGMENT_ALIGN(execp, eap->bss_start), NULLVP, 0,
                       VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           return 0;
   }

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