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/compat/m68k4k/m68k4k_exec.c

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    1 /*      $NetBSD: m68k4k_exec.c,v 1.19 2007/12/08 18:36:13 dsl 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 /*
   34  * Exec glue to provide compatibility with older NetBSD m68k4k exectuables.
   35  *
   36  * Taken directly from kern/exec_aout.c and frobbed to map text and
   37  * data as m68k4k executables expect.
   38  *
   39  * This module only works on machines with PAGE_SIZE == 4096.  It's not clear
   40  * that making it work on other machines is worth the trouble.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __KERNEL_RCSID(0, "$NetBSD: m68k4k_exec.c,v 1.19 2007/12/08 18:36:13 dsl Exp $");
   45 
   46 #if !defined(__m68k__)
   47 #error YOU GOTTA BE KIDDING!
   48 #endif
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/proc.h>
   53 #include <sys/malloc.h>
   54 #include <sys/vnode.h>
   55 #include <sys/exec.h>
   56 #include <sys/resourcevar.h>
   57 
   58 #include <compat/m68k4k/m68k4k_exec.h>
   59 
   60 int     exec_m68k4k_prep_zmagic(struct lwp *, struct exec_package *);
   61 int     exec_m68k4k_prep_nmagic(struct lwp *, struct exec_package *);
   62 int     exec_m68k4k_prep_omagic(struct lwp *, struct exec_package *);
   63 
   64 /*
   65  * exec_m68k4k_makecmds(): Check if it's an a.out-format executable
   66  * with an m68k4k magic number.
   67  *
   68  * Given a proc pointer and an exec package pointer, see if the referent
   69  * of the epp is in a.out format.  Just check 'standard' magic numbers for
   70  * this architecture.
   71  *
   72  * This function, in the former case, or the hook, in the latter, is
   73  * responsible for creating a set of vmcmds which can be used to build
   74  * the process's vm space and inserting them into the exec package.
   75  */
   76 
   77 int
   78 exec_m68k4k_makecmds(struct lwp *l, struct exec_package *epp)
   79 {
   80         u_long midmag, magic;
   81         u_short mid;
   82         int error;
   83         struct exec *execp = epp->ep_hdr;
   84 
   85         /* See note above... */
   86         if (M68K4K_LDPGSZ != PAGE_SIZE)
   87                 return ENOEXEC;
   88 
   89         if (epp->ep_hdrvalid < sizeof(struct exec))
   90                 return ENOEXEC;
   91 
   92         midmag = ntohl(execp->a_midmag);
   93         mid = (midmag >> 16) & 0x3ff;
   94         magic = midmag & 0xffff;
   95 
   96         midmag = mid << 16 | magic;
   97 
   98         switch (midmag) {
   99         case (MID_M68K4K << 16) | ZMAGIC:
  100                 error = exec_m68k4k_prep_zmagic(l, epp);
  101                 break;
  102         case (MID_M68K4K << 16) | NMAGIC:
  103                 error = exec_m68k4k_prep_nmagic(l, epp);
  104                 break;
  105         case (MID_M68K4K << 16) | OMAGIC:
  106                 error = exec_m68k4k_prep_omagic(l, epp);
  107                 break;
  108         default:
  109                 error = ENOEXEC;
  110         }
  111 
  112         if (error)
  113                 kill_vmcmds(&epp->ep_vmcmds);
  114 
  115         return error;
  116 }
  117 
  118 /*
  119  * exec_m68k4k_prep_zmagic(): Prepare an m68k4k ZMAGIC binary's exec package
  120  *
  121  * First, set of the various offsets/lengths in the exec package.
  122  *
  123  * Then, mark the text image busy (so it can be demand paged) or error
  124  * out if this is not possible.  Finally, set up vmcmds for the
  125  * text, data, bss, and stack segments.
  126  */
  127 
  128 int
  129 exec_m68k4k_prep_zmagic(struct lwp *l, struct exec_package *epp)
  130 {
  131         struct exec *execp = epp->ep_hdr;
  132         int error;
  133 
  134         epp->ep_taddr = M68K4K_USRTEXT;
  135         epp->ep_tsize = execp->a_text;
  136         epp->ep_daddr = epp->ep_taddr + execp->a_text;
  137         epp->ep_dsize = execp->a_data + execp->a_bss;
  138         epp->ep_entry = execp->a_entry;
  139 
  140         error = vn_marktext(epp->ep_vp);
  141         if (error)
  142                 return (error);
  143 
  144         /* set up command for text segment */
  145         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
  146             epp->ep_taddr, epp->ep_vp, 0, VM_PROT_READ|VM_PROT_EXECUTE);
  147 
  148         /* set up command for data segment */
  149         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
  150             epp->ep_daddr, epp->ep_vp, execp->a_text,
  151             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  152 
  153         /* set up command for bss segment */
  154         if (execp->a_bss)
  155                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
  156                     epp->ep_daddr + execp->a_data, NULLVP, 0,
  157                     VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  158 
  159         return (*epp->ep_esch->es_setup_stack)(l, epp);
  160 }
  161 
  162 /*
  163  * exec_m68k4k_prep_nmagic(): Prepare a m68k4k NMAGIC binary's exec package
  164  */
  165 
  166 int
  167 exec_m68k4k_prep_nmagic(struct lwp *l, struct exec_package *epp)
  168 {
  169         struct exec *execp = epp->ep_hdr;
  170         long bsize, baddr;
  171 
  172         epp->ep_taddr = M68K4K_USRTEXT;
  173         epp->ep_tsize = execp->a_text;
  174         epp->ep_daddr = roundup(epp->ep_taddr + execp->a_text,
  175             M68K4K_LDPGSZ);
  176         epp->ep_dsize = execp->a_data + execp->a_bss;
  177         epp->ep_entry = execp->a_entry;
  178 
  179         /* set up command for text segment */
  180         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
  181             epp->ep_taddr, epp->ep_vp, sizeof(struct exec),
  182             VM_PROT_READ|VM_PROT_EXECUTE);
  183 
  184         /* set up command for data segment */
  185         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
  186             epp->ep_daddr, epp->ep_vp, execp->a_text + sizeof(struct exec),
  187             VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  188 
  189         /* set up command for bss segment */
  190         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
  191         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  192         if (bsize > 0)
  193                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  194                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  195 
  196         return (*epp->ep_esch->es_setup_stack)(l, epp);
  197 }
  198 
  199 /*
  200  * exec_m68k4k_prep_omagic(): Prepare a m68k4k OMAGIC binary's exec package
  201  */
  202 
  203 int
  204 exec_m68k4k_prep_omagic(struct lwp *l, struct exec_package *epp)
  205 {
  206         struct exec *execp = epp->ep_hdr;
  207         long dsize, bsize, baddr;
  208 
  209         epp->ep_taddr = M68K4K_USRTEXT;
  210         epp->ep_tsize = execp->a_text;
  211         epp->ep_daddr = epp->ep_taddr + execp->a_text;
  212         epp->ep_dsize = execp->a_data + execp->a_bss;
  213         epp->ep_entry = execp->a_entry;
  214 
  215         /* set up command for text and data segments */
  216         NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
  217             execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
  218             sizeof(struct exec), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  219 
  220         /* set up command for bss segment */
  221         baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE);
  222         bsize = epp->ep_daddr + epp->ep_dsize - baddr;
  223         if (bsize > 0)
  224                 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
  225                     NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
  226 
  227         /*
  228          * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
  229          * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
  230          * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
  231          * respectively to page boundaries.
  232          * Compensate `ep_dsize' for the amount of data covered by the last
  233          * text page.
  234          */
  235         dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text,
  236                                                         PAGE_SIZE);
  237         epp->ep_dsize = (dsize > 0) ? dsize : 0;
  238         return (*epp->ep_esch->es_setup_stack)(l, epp);
  239 }

Cache object: dda5314900884fbcc527c6281020e668


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