exec_elf32.c

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    1 /*      $NetBSD: exec_elf32.c,v 1.143 2019/11/20 19:37:53 pgoyette Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1996 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  *      for the NetBSD Project.
   19  * 4. The name of the author may not be used to endorse or promote products
   20  *    derived from this software without specific prior written permission
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: exec_elf32.c,v 1.143 2019/11/20 19:37:53 pgoyette Exp $");
   36 
   37 #define ELFSIZE 32
   38 
   39 #include "exec_elf.c"
   40 
   41 #include <sys/module.h>
   42 
   43 #define ELF32_AUXSIZE (ELF_AUX_ENTRIES * sizeof(Aux32Info) \
   44     + MAXPATHLEN + ALIGN(1))
   45 
   46 MODULE(MODULE_CLASS_EXEC, exec_elf32, NULL);
   47 
   48 static struct execsw exec_elf32_execsw[] = {
   49         {
   50                 .es_hdrsz = sizeof (Elf32_Ehdr),
   51                 .es_makecmds = exec_elf32_makecmds,
   52                 .u = {
   53                         .elf_probe_func = netbsd_elf32_probe,
   54                 },
   55                 .es_emul = &emul_netbsd,
   56                 .es_prio = EXECSW_PRIO_FIRST,
   57                 .es_arglen = ELF32_AUXSIZE,
   58                 .es_copyargs = elf32_copyargs,
   59                 .es_setregs = NULL,
   60                 .es_coredump = coredump_elf32,
   61                 .es_setup_stack = exec_setup_stack,
   62         },
   63 #if EXEC_ELF_NOTELESS
   64         {
   65                 .es_hdrsz = sizeof (Elf32_Ehdr),
   66                 .es_makecmds = exec_elf32_makecmds,
   67                 .u {
   68                         elf_probe_func = NULL,
   69                 },
   70                 .es_emul = &emul_netbsd,
   71                 .es_prio = EXECSW_PRIO_LAST,
   72                 .es_arglen = ELF32_AUXSIZE,
   73                 .es_copyargs = elf32_copyargs,
   74                 .es_setregs = NULL,
   75                 .es_coredump = coredump_elf32,
   76                 .es_setup_stack = exec_setup_stack,
   77         },
   78 #endif
   79 };
   80 
   81 static int
   82 exec_elf32_modcmd(modcmd_t cmd, void *arg)
   83 {
   84 #if ARCH_ELFSIZE == 64
   85         /*
   86          * If we are on a 64bit system, we don't want the 32bit execsw[] to be
   87          * added in the global array, because the exec_elf32 module only works
   88          * on 32bit systems.
   89          *
   90          * However, we need the exec_elf32 module, because it will make the 32bit
   91          * functions available for netbsd32 and linux32.
   92          *
   93          * Therefore, allow this module on 64bit systems, but make it dormant.
   94          */
   95 
   96         (void)exec_elf32_execsw; /* unused */
   97 
   98         switch (cmd) {
   99         case MODULE_CMD_INIT:
  100         case MODULE_CMD_FINI:
  101                 return 0;
  102         default:
  103                 return ENOTTY;
  104         }
  105 #else /* ARCH_ELFSIZE == 64 */
  106         switch (cmd) {
  107         case MODULE_CMD_INIT:
  108                 return exec_add(exec_elf32_execsw,
  109                     __arraycount(exec_elf32_execsw));
  110 
  111         case MODULE_CMD_FINI:
  112                 return exec_remove(exec_elf32_execsw,
  113                     __arraycount(exec_elf32_execsw));
  114 
  115         default:
  116                 return ENOTTY;
  117         }
  118 #endif /* ARCH_ELFSIZE == 64 */
  119 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/exec_elf32.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/exec_elf32.c