FreeBSD/Linux Kernel Cross Reference
sys/compat/netbsd32/netbsd32_exec_aout.c

     /*      $NetBSD: netbsd32_exec_aout.c,v 1.24 2008/05/29 14:51:26 mrg Exp $      */
     /*      from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
     
     /*
      * Copyright (c) 1998, 2001 Matthew R. Green.
      * 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.
     *
     * 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.
     */
    
    /*
     * 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: netbsd32_exec_aout.c,v 1.24 2008/05/29 14:51:26 mrg 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/exec_aout.h>
    #include <sys/resourcevar.h>
    #include <sys/signal.h>
    #include <sys/signalvar.h>
    
    #include <compat/netbsd32/netbsd32.h>
    #ifndef EXEC_AOUT
    #define EXEC_AOUT
    #endif
    #include <compat/netbsd32/netbsd32_exec.h>
    
    #include <machine/frame.h>
    #include <machine/netbsd32_machdep.h>
    
    int netbsd32_copyinargs(struct exec_package *, struct ps_strings *,
                                 void *, size_t, const void *, const void *);
    
    /*
     * exec_netbsd32_makecmds(): Check if it's an netbsd32 a.out format
     * executable.
     *
     * Given a lwp pointer and an exec package pointer, see if the referent
     * of the epp is in netbsd32 a.out format.  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_netbsd32_makecmds(struct lwp *l, struct exec_package *epp)
   {
           netbsd32_u_long midmag, magic;
           u_short mid;
           int error;
           struct netbsd32_exec *execp = epp->ep_hdr;
   
           if (epp->ep_hdrvalid < sizeof(struct netbsd32_exec))
                   return ENOEXEC;
   
           midmag = (netbsd32_u_long)ntohl(execp->a_midmag);
           mid = (midmag >> 16) & 0x3ff;
           magic = midmag & 0xffff;
   
           midmag = mid << 16 | magic;
   
           /* this is already needed by setup_stack() */
           epp->ep_flags |= EXEC_32;
   
           switch (midmag) {
           case (NETBSD32_MID_MACHINE << 16) | ZMAGIC:
                   error = netbsd32_exec_aout_prep_zmagic(l, epp);
                   break;
           case (NETBSD32_MID_MACHINE << 16) | NMAGIC:
                   error = netbsd32_exec_aout_prep_nmagic(l, epp);
                   break;
           case (NETBSD32_MID_MACHINE << 16) | OMAGIC:
                   error = netbsd32_exec_aout_prep_omagic(l, epp);
                   break;
           default:
                   /* Invalid magic */
                   error = ENOEXEC;
                   break;
           }
   
           if (error) {
                   kill_vmcmds(&epp->ep_vmcmds);
                   epp->ep_flags &= ~EXEC_32;
           }
           return error;
   }
   
   /*
    * netbsd32_exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's
    * exec package
    *
    * First, set of 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
   netbsd32_exec_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
   {
           struct netbsd32_exec *execp = epp->ep_hdr;
           int error;
   
           epp->ep_taddr = AOUT_LDPGSZ;
           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;
           epp->ep_vm_minaddr = VM_MIN_ADDRESS;
           epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
   
           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, 0, 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,
               VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
   
           /* set up command for bss segment */
           if (execp->a_bss > 0)
                   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);
   }
   
   /*
    * netbsd32_exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's
    * exec package
    */
   
   int
   netbsd32_exec_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
   {
           struct netbsd32_exec *execp = epp->ep_hdr;
           long bsize, baddr;
   
           epp->ep_taddr = AOUT_LDPGSZ;
           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;
           epp->ep_vm_minaddr = VM_MIN_ADDRESS;
           epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
   
           /* 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 netbsd32_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 netbsd32_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);
   }
   
   /*
    * netbsd32_exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's
    * exec package
    */
   
   int
   netbsd32_exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
   {
           struct netbsd32_exec *execp = epp->ep_hdr;
           long dsize, bsize, baddr;
   
           epp->ep_taddr = AOUT_LDPGSZ;
           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;
           epp->ep_vm_minaddr = VM_MIN_ADDRESS;
           epp->ep_vm_maxaddr = VM_MAXUSER_ADDRESS32;
   
           /* 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 netbsd32_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);
   }

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