usr.sbin/mdsetimage/exec_elf32.c

   1 /* $NetBSD: exec_elf32.c,v 1.10 2009/07/30 15:16:38 tsutsui 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. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: exec_elf32.c,v 1.10 2009/07/30 15:16:38 tsutsui Exp $");
  35 #endif /* not lint */
  36
  37 #ifndef ELFSIZE
  38 #define ELFSIZE         32
  39 #endif
  40
  41 #include <sys/types.h>
  42 #include <stdio.h>
  43 #include <string.h>
  44 #include "extern.h"
  45
  46 #if defined(NLIST_ELF32) || defined(NLIST_ELF64)
  47 #include <sys/exec_elf.h>
  48 #endif
  49
  50 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \
  51     (defined(NLIST_ELF64) && (ELFSIZE == 64))
  52
  53 #define check(off, size)        ((off < 0) || (off + size > mappedsize))
  54 #define BAD                     do { rv = -1; goto out; } while (0)
  55
  56 int
  57 ELFNAMEEND(check)(mappedfile, mappedsize)
  58         const char *mappedfile;
  59         size_t mappedsize;
  60 {
  61         const Elf_Ehdr *ehdrp;
  62         int rv;
  63
  64         rv = 0;
  65
  66         if (check(0, sizeof *ehdrp))
  67                 BAD;
  68         ehdrp = (const Elf_Ehdr *)&mappedfile[0];
  69
  70         if (memcmp(ehdrp->e_ident, ELFMAG, SELFMAG) != 0 ||
  71             ehdrp->e_ident[EI_CLASS] != ELFCLASS)
  72                 BAD;
  73
  74         switch (ehdrp->e_machine) {
  75         ELFDEFNNAME(MACHDEP_ID_CASES)
  76
  77         default:
  78                 BAD;
  79         }
  80
  81 out:
  82         return (rv);
  83 }
  84
  85 int
  86 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp)
  87         const char *mappedfile;
  88         size_t mappedsize, *fileoffp;
  89         u_long vmaddr;
  90 {
  91         const Elf_Ehdr *ehdrp;
  92         const Elf_Phdr *phdrp;
  93         Elf_Off phdr_off;
  94         Elf_Word phdr_size;
  95 #if (ELFSIZE == 32)
  96         Elf32_Half nphdr, i;
  97 #elif (ELFSIZE == 64)
  98         Elf64_Half nphdr, i;
  99 #endif
 100         int rv;
 101
 102         rv = 0;
 103
 104         ehdrp = (const Elf_Ehdr *)&mappedfile[0];
 105         nphdr = ehdrp->e_phnum;
 106         phdr_off = ehdrp->e_phoff;
 107         phdr_size = sizeof(Elf_Phdr) * nphdr;
 108
 109         if (check(0, phdr_off + phdr_size))
 110                 BAD;
 111         phdrp = (const Elf_Phdr *)&mappedfile[phdr_off];
 112
 113 #define IS_TEXT(p)      (p.p_flags & PF_X)
 114 #define IS_DATA(p)      (p.p_flags & PF_W)
 115
 116         for (i = 0; i < nphdr; i++) {
 117                 if ((IS_TEXT(phdrp[i]) || IS_DATA(phdrp[i])) &&
 118                     phdrp[i].p_vaddr <= vmaddr &&
 119                     vmaddr < phdrp[i].p_vaddr + phdrp[i].p_filesz) {
 120                         *fileoffp = vmaddr -
 121                             phdrp[i].p_vaddr + phdrp[i].p_offset;
 122                         break;
 123                 }
 124         }
 125         if (i == nphdr)
 126                 BAD;
 127
 128 out:
 129         return (rv);
 130 }
 131
 132 #endif /* include this size of ELF */