sys/compat/svr4/svr4_mod.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software developed for The NetBSD Foundation
   8  * by Andrew Doran.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD$");
  34
  35 #ifndef ELFSIZE
  36 #define ELFSIZE ARCH_ELFSIZE
  37 #endif
  38
  39 #include <sys/param.h>
  40 #include <sys/module.h>
  41 #include <sys/exec.h>
  42 #include <sys/exec_elf.h>
  43
  44 #include <compat/svr4/svr4_util.h>
  45 #include <compat/svr4/svr4_exec.h>
  46
  47 #if defined(EXEC_ELF32) && ELFSIZE == 32
  48 # define        MD1     ",exec_elf32"
  49 #else
  50 # define        MD1     ""
  51 #endif
  52 #if defined(EXEC_ELF64)
  53 # define        MD2     ",exec_elf64"
  54 #else
  55 # define        MD2     ""
  56 #endif
  57
  58 MODULE(MODULE_CLASS_MISC, compat_svr4, "compat" MD1 MD2);
  59
  60 #define ELF32_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux32Info), \
  61     sizeof(Elf32_Addr)) + MAXPATHLEN + ALIGN(1))
  62 #define ELF64_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux64Info), \
  63     sizeof(Elf64_Addr)) + MAXPATHLEN + ALIGN(1))
  64
  65 static struct execsw svr4_execsw[] = {
  66 #if defined(EXEC_ELF32) && ELFSIZE == 32
  67         { sizeof (Elf32_Ehdr),
  68           exec_elf32_makecmds,
  69           { svr4_elf32_probe },
  70           &emul_svr4,
  71           EXECSW_PRIO_LAST,     /* probe always succeeds */
  72           ELF32_AUXSIZE,
  73           elf32_copyargs,
  74           NULL,
  75           coredump_elf32,
  76           exec_setup_stack },
  77 #elif defined(EXEC_ELF64)
  78         { sizeof (Elf64_Ehdr),
  79           exec_elf64_makecmds,
  80           { svr4_elf64_probe },
  81           &emul_svr4,
  82           EXECSW_PRIO_LAST,     /* probe always succeeds */
  83           ELF64_AUXSIZE,
  84           elf64_copyargs,
  85           NULL,
  86           coredump_elf64,
  87           exec_setup_stack },
  88 #endif
  89 };
  90
  91 static int
  92 compat_svr4_modcmd(modcmd_t cmd, void *arg)
  93 {
  94         int error;
  95
  96         switch (cmd) {
  97         case MODULE_CMD_INIT:
  98                 svr4_md_init();
  99                 error = exec_add(svr4_execsw, __arraycount(svr4_execsw));
 100                 if (error != 0)
 101                         svr4_md_fini();
 102                 return error;
 103
 104         case MODULE_CMD_FINI:
 105                 error = exec_remove(svr4_execsw, __arraycount(svr4_execsw));
 106                 if (error == 0)
 107                         svr4_md_fini();
 108                 return error;
 109
 110         default:
 111                 return ENOTTY;
 112         }
 113 }