external/bsd/libelf/dist/gelf_phdr.c

   1 /*      $NetBSD: gelf_phdr.c,v 1.2 2009/12/19 06:39:29 thorpej Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2006 Joseph Koshy
   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 PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 /* __FBSDID("$FreeBSD: src/lib/libelf/gelf_phdr.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <gelf.h>
  33 #include <limits.h>
  34 #include <libelf.h>
  35
  36 #include "_libelf.h"
  37
  38 Elf32_Phdr *
  39 elf32_getphdr(Elf *e)
  40 {
  41         return (_libelf_getphdr(e, ELFCLASS32));
  42 }
  43
  44 Elf64_Phdr *
  45 elf64_getphdr(Elf *e)
  46 {
  47         return (_libelf_getphdr(e, ELFCLASS64));
  48 }
  49
  50 GElf_Phdr *
  51 gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
  52 {
  53         int ec;
  54         Elf32_Ehdr *eh32;
  55         Elf64_Ehdr *eh64;
  56         Elf32_Phdr *ep32;
  57         Elf64_Phdr *ep64;
  58
  59         if (d == NULL || e == NULL ||
  60             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
  61             (e->e_kind != ELF_K_ELF) || index < 0) {
  62                 LIBELF_SET_ERROR(ARGUMENT, 0);
  63                 return (NULL);
  64         }
  65
  66         if (ec == ELFCLASS32) {
  67                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
  68                     ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
  69                         return (NULL);
  70
  71                 if (index >= eh32->e_phnum) {
  72                         LIBELF_SET_ERROR(ARGUMENT, 0);
  73                         return (NULL);
  74                 }
  75
  76                 ep32 += index;
  77
  78                 d->p_type   = ep32->p_type;
  79                 d->p_offset = ep32->p_offset;
  80                 d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
  81                 d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
  82                 d->p_filesz = (Elf64_Xword) ep32->p_filesz;
  83                 d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
  84                 d->p_flags  = ep32->p_flags;
  85                 d->p_align  = (Elf64_Xword) ep32->p_align;
  86
  87         } else {
  88                 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
  89                     (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
  90                         return (NULL);
  91
  92                 if (index >= eh64->e_phnum) {
  93                         LIBELF_SET_ERROR(ARGUMENT, 0);
  94                         return (NULL);
  95                 }
  96
  97                 ep64 += index;
  98
  99                 *d = *ep64;
 100         }
 101
 102         return (d);
 103 }
 104
 105 Elf32_Phdr *
 106 elf32_newphdr(Elf *e, size_t count)
 107 {
 108         return (_libelf_newphdr(e, ELFCLASS32, count));
 109 }
 110
 111 Elf64_Phdr *
 112 elf64_newphdr(Elf *e, size_t count)
 113 {
 114         return (_libelf_newphdr(e, ELFCLASS64, count));
 115 }
 116
 117 void *
 118 gelf_newphdr(Elf *e, size_t count)
 119 {
 120         if (e == NULL) {
 121                 LIBELF_SET_ERROR(ARGUMENT, 0);
 122                 return (NULL);
 123         }
 124         return (_libelf_newphdr(e, e->e_class, count));
 125 }
 126
 127 int
 128 gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
 129 {
 130         int ec, phnum;
 131         void *ehdr;
 132         Elf32_Phdr *ph32;
 133         Elf64_Phdr *ph64;
 134
 135         if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 136             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 137                 LIBELF_SET_ERROR(ARGUMENT, 0);
 138                 return (0);
 139         }
 140
 141         if (e->e_cmd == ELF_C_READ) {
 142                 LIBELF_SET_ERROR(MODE, 0);
 143                 return (0);
 144         }
 145
 146         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 147                 return (0);
 148
 149         if (ec == ELFCLASS32)
 150                 phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
 151         else
 152                 phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
 153
 154         if (ndx < 0 || ndx > phnum) {
 155                 LIBELF_SET_ERROR(ARGUMENT, 0);
 156                 return (0);
 157         }
 158
 159         if (ec == ELFCLASS64) {
 160                 ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
 161                 *ph64 = *s;
 162                 return (1);
 163         }
 164
 165         ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;
 166
 167         ph32->p_type     =  s->p_type;
 168         ph32->p_flags    =  s->p_flags;
 169         LIBELF_COPY_U32(ph32, s, p_offset);
 170         LIBELF_COPY_U32(ph32, s, p_vaddr);
 171         LIBELF_COPY_U32(ph32, s, p_paddr);
 172         LIBELF_COPY_U32(ph32, s, p_filesz);
 173         LIBELF_COPY_U32(ph32, s, p_memsz);
 174         LIBELF_COPY_U32(ph32, s, p_align);
 175
 176         (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
 177
 178         return (1);
 179 }