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_aout.c

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    1 /*      $NetBSD: exec_aout.c,v 1.35 2011/04/24 18:46:22 rmind 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: exec_aout.c,v 1.35 2011/04/24 18:46:22 rmind Exp $");
   35 
   36 #ifdef _KERNEL_OPT
   37 #include "opt_coredump.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/exec_aout.h>
   46 #include <sys/resourcevar.h>
   47 #include <sys/module.h>
   48 
   49 #include <uvm/uvm_extern.h>
   50 
   51 #ifdef COREDUMP
   52 #define DEP     "coredump"
   53 #else
   54 #define DEP     NULL
   55 #endif
   56 
   57 MODULE(MODULE_CLASS_MISC, exec_aout, DEP);
   58 
   59 static struct execsw exec_aout_execsw[] = {
   60         { sizeof(struct exec),
   61           exec_aout_makecmds,
   62           { NULL },
   63           &emul_netbsd,
   64           EXECSW_PRIO_ANY,
   65           0,
   66           copyargs,
   67           NULL,
   68           coredump_netbsd,
   69           exec_setup_stack },
   70 };
   71 
   72 static int
   73 exec_aout_modcmd(modcmd_t cmd, void *arg)
   74 {
   75 
   76         switch (cmd) {
   77         case MODULE_CMD_INIT:
   78                 return exec_add(exec_aout_execsw,
   79                     __arraycount(exec_aout_execsw));
   80 
   81         case MODULE_CMD_FINI:
   82                 return exec_remove(exec_aout_execsw,
   83                     __arraycount(exec_aout_execsw));
   84 
   85         default:
   86                 return ENOTTY;
   87         }
   88 }
   89 
   90 /*
   91  * exec_aout_makecmds(): Check if it's an a.out-format executable.
   92  *
   93  * Given a lwp pointer and an exec package pointer, see if the referent
   94  * of the epp is in a.out format.  First check 'standard' magic numbers for
   95  * this architecture.  If that fails, try a CPU-dependent hook.
   96  *
   97  * This function, in the former case, or the hook, in the latter, is
   98  * responsible for creating a set of vmcmds which can be used to build
   99  * the process's vm space and inserting them into the exec package.
  100  */
  101 
  102 int
  103 exec_aout_makecmds(struct lwp *l, struct exec_package *epp)
  104 {
  105         u_long midmag, magic;
  106         u_short mid;
  107         int error;
  108         struct exec *execp = epp->ep_hdr;
  109 
  110         if (epp->ep_hdrvalid < sizeof(struct exec))
  111                 return ENOEXEC;
  112 
  113         midmag = ntohl(execp->a_midmag);
  114         mid = (midmag >> 16) & 0x3ff;
  115         magic = midmag & 0xffff;
  116 
  117         midmag = mid << 16 | magic;
  118 
  119         switch (midmag) {
  120         case (MID_MACHINE << 16) | ZMAGIC:
  121                 error = exec_aout_prep_zmagic(l, epp);
  122                 break;
  123         case (MID_MACHINE << 16) | NMAGIC:
  124                 error = exec_aout_prep_nmagic(l, epp);
  125                 break;
  126         case (MID_MACHINE << 16) | OMAGIC:
  127                 error = exec_aout_prep_omagic(l, epp);
  128                 break;
  129         default:
  130                 error = cpu_exec_aout_makecmds(l, epp);
  131         }
  132 
  133         if (error)
  134                 kill_vmcmds(&epp->ep_vmcmds);
  135 
  136         return error;
  137 }
  138 
  139 /*
  140  * exec_aout_prep_zmagic(): Prepare a 'native' ZMAGIC binary's exec package
  141  *
  142  * First, set of the various offsets/lengths in the exec package.
  143  *
  144  * Then, mark the text image busy (so it can be demand paged) or error
  145  * out if this is not possible.  Finally, set up vmcmds for the
  146  * text, data, bss, and stack segments.
  147  */
  148 
  149 int
  150 exec_aout_prep_zmagic(struct lwp *l, struct exec_package *epp)
  151 {
  152         struct exec *execp = epp->ep_hdr;
  153         int error;
  154 
  155         epp->ep_taddr = AOUT_LDPGSZ;
  156         epp->ep_tsize = execp->a_text;
  157         epp->ep_daddr = epp->ep_taddr + execp->a_text;
  158         epp->ep_dsize = execp->a_data + execp->a_bss;
  159         epp->ep_entry = execp->a_entry;
  160 
  161         error = vn_marktext(epp->ep_vp);
  162         if (error)
  163                 return (error);
  164 
  165         /* set up command for text segment */
  166         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, round_page(execp->a_text),
  167             epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
  168 
  169         /* set up command for data segment */
  170         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, round_page(execp->a_data),
  171             epp->ep_daddr, epp->ep_vp, execp->a_text,
  172             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  173 
  174         /* set up command for bss segment */
  175         if (execp->a_bss > 0)
  176                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
  177                     epp->ep_daddr + execp->a_data, NULLVP, 0,
  178                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  179 
  180         return (*epp->ep_esch->es_setup_stack)(l, epp);
  181 }
  182 
  183 /*
  184  * exec_aout_prep_nmagic(): Prepare a 'native' NMAGIC binary's exec package
  185  */
  186 
  187 int
  188 exec_aout_prep_nmagic(struct lwp *l, struct exec_package *epp)
  189 {
  190         struct exec *execp = epp->ep_hdr;
  191         long bsize, baddr;
  192 
  193         epp->ep_taddr = AOUT_LDPGSZ;
  194         epp->ep_tsize = execp->a_text;
  195         epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text, AOUT_LDPGSZ);
  196         epp->ep_dsize = execp->a_data + execp->a_bss;
  197         epp->ep_entry = execp->a_entry;
  198 
  199         /* set up command for text segment */
  200         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
  201             epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
  202             VM_PROT_READ|VM_PROT_EXECUTE);
  203 
  204         /* set up command for data segment */
  205         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
  206             epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
  207             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  208 
  209         /* set up command for bss segment */
  210         baddr = round_page(epp->ep_daddr + execp->a_data);
  211         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  212         if (bsize > 0)
  213                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  214                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  215 
  216         return (*epp->ep_esch->es_setup_stack)(l, epp);
  217 }
  218 
  219 /*
  220  * exec_aout_prep_omagic(): Prepare a 'native' OMAGIC binary's exec package
  221  */
  222 
  223 int
  224 exec_aout_prep_omagic(struct lwp *l, struct exec_package *epp)
  225 {
  226         struct exec *execp = epp->ep_hdr;
  227         long dsize, bsize, baddr;
  228 
  229         epp->ep_taddr = AOUT_LDPGSZ;
  230         epp->ep_tsize = execp->a_text;
  231         epp->ep_daddr = epp->ep_taddr + execp->a_text;
  232         epp->ep_dsize = execp->a_data + execp->a_bss;
  233         epp->ep_entry = execp->a_entry;
  234 
  235         /* set up command for text and data segments */
  236         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
  237             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
  238             sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  239 
  240         /* set up command for bss segment */
  241         baddr = round_page(epp->ep_daddr + execp->a_data);
  242         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  243         if (bsize > 0)
  244                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  245                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  246 
  247         /*
  248          * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
  249          * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
  250          * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
  251          * respectively to page boundaries.
  252          * Compensate `ep_dsize' for the amount of data covered by the last
  253          * text page.
  254          */
  255         dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
  256         epp->ep_dsize = (dsize > 0) ? dsize : 0;
  257         return (*epp->ep_esch->es_setup_stack)(l, epp);
  258 }

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