usr.sbin/btxld/elfh.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 1998 Robert Nordier
   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  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  21  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  22  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  23  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  25  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  26  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #include <sys/types.h>
  32 #include <sys/endian.h>
  33
  34 #include <stddef.h>
  35 #include "elfh.h"
  36
  37 #define SET_ME  0xeeeeeeee    /* filled in by btxld */
  38
  39 /*
  40  * ELF header template.
  41  */
  42 const struct elfh elfhdr = {
  43     {
  44         {
  45             ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3,     /* e_ident */
  46             ELFCLASS32, ELFDATA2LSB, EV_CURRENT, 0,
  47             'F', 'r', 'e', 'e', 'B', 'S', 'D', 0
  48         },
  49         htole16(ET_EXEC),                           /* e_type */
  50         htole16(EM_386),                            /* e_machine */
  51         htole32(EV_CURRENT),                        /* e_version */
  52         htole32(SET_ME),                            /* e_entry */
  53         htole32(offsetof(struct elfh, p)),          /* e_phoff */
  54         htole32(offsetof(struct elfh, sh)),         /* e_shoff */
  55         0,                                          /* e_flags */
  56         htole16(sizeof(elfhdr.e)),                  /* e_ehsize */
  57         htole16(sizeof(elfhdr.p[0])),               /* e_phentsize */
  58         htole16(sizeof(elfhdr.p) / sizeof(elfhdr.p[0])), /* e_phnum */
  59         htole16(sizeof(elfhdr.sh[0])),              /* e_shentsize */
  60         htole16(sizeof(elfhdr.sh) / sizeof(elfhdr.sh[0])), /* e_shnum */
  61         htole16(1)                                  /* e_shstrndx */
  62     },
  63     {
  64         {
  65             htole32(PT_LOAD),                       /* p_type */
  66             htole32(sizeof(elfhdr)),                /* p_offset */
  67             htole32(SET_ME),                        /* p_vaddr */
  68             htole32(SET_ME),                        /* p_paddr */
  69             htole32(SET_ME),                        /* p_filesz */
  70             htole32(SET_ME),                        /* p_memsz */
  71             htole32(PF_R | PF_X),                   /* p_flags */
  72             htole32(0x1000)                         /* p_align */
  73         },
  74         {
  75             htole32(PT_LOAD),                       /* p_type */
  76             htole32(SET_ME),                        /* p_offset */
  77             htole32(SET_ME),                        /* p_vaddr */
  78             htole32(SET_ME),                        /* p_paddr */
  79             htole32(SET_ME),                        /* p_filesz */
  80             htole32(SET_ME),                        /* p_memsz */
  81             htole32(PF_R | PF_W),                   /* p_flags */
  82             htole32(0x1000)                         /* p_align */
  83         }
  84     },
  85     {
  86         {
  87             0, htole32(SHT_NULL), 0, 0, 0, 0, htole32(SHN_UNDEF), 0, 0, 0
  88         },
  89         {
  90             htole32(1),                             /* sh_name */
  91             htole32(SHT_STRTAB),                    /* sh_type */
  92             0,                                      /* sh_flags */
  93             0,                                      /* sh_addr */
  94             htole32(offsetof(struct elfh, shstrtab)), /* sh_offset */
  95             htole32(sizeof(elfhdr.shstrtab)),       /* sh_size */
  96             htole32(SHN_UNDEF),                     /* sh_link */
  97             0,                                      /* sh_info */
  98             htole32(1),                             /* sh_addralign */
  99             0                                       /* sh_entsize */
 100         },
 101         {
 102             htole32(0xb),                           /* sh_name */
 103             htole32(SHT_PROGBITS),                  /* sh_type */
 104             htole32(SHF_EXECINSTR | SHF_ALLOC),     /* sh_flags */
 105             htole32(SET_ME),                        /* sh_addr */
 106             htole32(SET_ME),                        /* sh_offset */
 107             htole32(SET_ME),                        /* sh_size */
 108             htole32(SHN_UNDEF),                     /* sh_link */
 109             0,                                      /* sh_info */
 110             htole32(4),                             /* sh_addralign */
 111             0                                       /* sh_entsize */
 112         },
 113         {
 114             htole32(0x11),                          /* sh_name */
 115             htole32(SHT_PROGBITS),                  /* sh_type */
 116             htole32(SHF_ALLOC | SHF_WRITE),         /* sh_flags */
 117             htole32(SET_ME),                        /* sh_addr */
 118             htole32(SET_ME),                        /* sh_offset */
 119             htole32(SET_ME),                        /* sh_size */
 120             htole32(SHN_UNDEF),                     /* sh_link */
 121             0,                                      /* sh_info */
 122             htole32(4),                             /* sh_addralign */
 123             0                                       /* sh_entsize */
 124         }
 125     },
 126     "\0.shstrtab\0.text\0.data"                     /* shstrtab */
 127 };