sys/compat/common/compat_exec.c

   1 /*      $NetBSD: compat_exec.c,v 1.16 2009/08/13 03:53:13 matt Exp $    */
   2
   3 /*
   4  * Copyright (c) 1993, 1994 Christopher G. Demetriou
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Christopher G. Demetriou.
  18  * 4. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __KERNEL_RCSID(0, "$NetBSD: compat_exec.c,v 1.16 2009/08/13 03:53:13 matt Exp $");
  35
  36 #ifdef _KERNEL_OPT
  37 #include "opt_execfmt.h"
  38 #endif
  39
  40 #include <sys/param.h>
  41 #include <sys/systm.h>
  42 #include <sys/proc.h>
  43 #include <sys/vnode.h>
  44 #include <sys/exec.h>
  45 #include <sys/resourcevar.h>
  46
  47 #ifdef EXEC_AOUT
  48 #include <sys/exec_aout.h>
  49
  50 /*
  51  * exec_aout_prep_oldzmagic():
  52  *      Prepare the vmcmds to build a vmspace for an old ZMAGIC
  53  *      binary. [386BSD/BSDI/4.4BSD/NetBSD0.8]
  54  *
  55  * Cloned from exec_aout_prep_zmagic() in kern/exec_aout.c; a more verbose
  56  * description of operation is there.
  57  * There were copies of this in the mac68k, hp300, and i386 ports.
  58  */
  59 int
  60 exec_aout_prep_oldzmagic(struct lwp *l, struct exec_package *epp)
  61 {
  62         struct exec *execp = epp->ep_hdr;
  63         int error;
  64
  65         epp->ep_taddr = 0;
  66         epp->ep_tsize = execp->a_text;
  67         epp->ep_daddr = epp->ep_taddr + execp->a_text;
  68         epp->ep_dsize = execp->a_data + execp->a_bss;
  69         epp->ep_entry = execp->a_entry;
  70
  71         error = vn_marktext(epp->ep_vp);
  72         if (error)
  73                 return (error);
  74
  75         /* set up command for text segment */
  76         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
  77             epp->ep_taddr, epp->ep_vp, PAGE_SIZE, /* XXX CLBYTES? */
  78             VM_PROT_READ|VM_PROT_EXECUTE);
  79
  80         /* set up command for data segment */
  81         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
  82             epp->ep_daddr, epp->ep_vp,
  83             execp->a_text + PAGE_SIZE, /* XXX CLBYTES? */
  84             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  85
  86         /* set up command for bss segment */
  87         if (execp->a_bss)
  88             NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
  89                 epp->ep_daddr + execp->a_data, NULLVP, 0,
  90                 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  91
  92         return (*epp->ep_esch->es_setup_stack)(l, epp);
  93 }
  94
  95
  96 /*
  97  * exec_aout_prep_oldnmagic():
  98  *      Prepare the vmcmds to build a vmspace for an old NMAGIC
  99  *      binary. [BSDI]
 100  *
 101  * Cloned from exec_aout_prep_nmagic() in kern/exec_aout.c; with text starting
 102  * at 0.
 103  * XXX: There must be a better way to share this code.
 104  */
 105 int
 106 exec_aout_prep_oldnmagic(struct lwp *l, struct exec_package *epp)
 107 {
 108         struct exec *execp = epp->ep_hdr;
 109         long bsize, baddr;
 110
 111         epp->ep_taddr = 0;
 112         epp->ep_tsize = execp->a_text;
 113         epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
 114         epp->ep_dsize = execp->a_data + execp->a_bss;
 115         epp->ep_entry = execp->a_entry;
 116
 117         /* set up command for text segment */
 118         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
 119             epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
 120             VM_PROT_READ|VM_PROT_EXECUTE);
 121
 122         /* set up command for data segment */
 123         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
 124             epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
 125             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 126
 127         /* set up command for bss segment */
 128         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 129         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 130         if (bsize > 0)
 131                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 132                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 133
 134         return (*epp->ep_esch->es_setup_stack)(l, epp);
 135 }
 136
 137
 138 /*
 139  * exec_aout_prep_oldomagic():
 140  *      Prepare the vmcmds to build a vmspace for an old OMAGIC
 141  *      binary. [BSDI]
 142  *
 143  * Cloned from exec_aout_prep_omagic() in kern/exec_aout.c; with text starting
 144  * at 0.
 145  * XXX: There must be a better way to share this code.
 146  */
 147 int
 148 exec_aout_prep_oldomagic(struct lwp *l, struct exec_package *epp)
 149 {
 150         struct exec *execp = epp->ep_hdr;
 151         long dsize, bsize, baddr;
 152
 153         epp->ep_taddr = 0;
 154         epp->ep_tsize = execp->a_text;
 155         epp->ep_daddr = epp->ep_taddr + execp->a_text;
 156         epp->ep_dsize = execp->a_data + execp->a_bss;
 157         epp->ep_entry = execp->a_entry;
 158
 159         /* set up command for text and data segments */
 160         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
 161             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
 162             sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 163
 164         /* set up command for bss segment */
 165         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
 166         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
 167         if (bsize > 0)
 168                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
 169                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
 170
 171         /*
 172          * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
 173          * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
 174          * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
 175          * respectively to page boundaries.
 176          * Compensate `ep_dsize' for the amount of data covered by the last
 177          * text page.
 178          */
 179         dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
 180                                                         PAGE_SIZE);
 181         epp->ep_dsize = (dsize > 0) ? dsize : 0;
 182         return (*epp->ep_esch->es_setup_stack)(l, epp);
 183 }
 184 #endif /* EXEC_AOUT */