lib/libelf/gelf_phdr.c

   1 /*-
   2  * Copyright (c) 2006,2008 Joseph Koshy
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28
  29 #include <gelf.h>
  30 #include <libelf.h>
  31
  32 #include "_libelf.h"
  33
  34 LIBELF_VCSID("$Id$");
  35
  36 Elf32_Phdr *
  37 elf32_getphdr(Elf *e)
  38 {
  39         return (_libelf_getphdr(e, ELFCLASS32));
  40 }
  41
  42 Elf64_Phdr *
  43 elf64_getphdr(Elf *e)
  44 {
  45         return (_libelf_getphdr(e, ELFCLASS64));
  46 }
  47
  48 GElf_Phdr *
  49 gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
  50 {
  51         int ec;
  52         Elf32_Ehdr *eh32;
  53         Elf64_Ehdr *eh64;
  54         Elf32_Phdr *ep32;
  55         Elf64_Phdr *ep64;
  56
  57         if (d == NULL || e == NULL ||
  58             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64) ||
  59             (e->e_kind != ELF_K_ELF) || index < 0) {
  60                 LIBELF_SET_ERROR(ARGUMENT, 0);
  61                 return (NULL);
  62         }
  63
  64         if (ec == ELFCLASS32) {
  65                 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
  66                     ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
  67                         return (NULL);
  68
  69                 if (index >= eh32->e_phnum) {
  70                         LIBELF_SET_ERROR(ARGUMENT, 0);
  71                         return (NULL);
  72                 }
  73
  74                 ep32 += index;
  75
  76                 d->p_type   = ep32->p_type;
  77                 d->p_offset = ep32->p_offset;
  78                 d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
  79                 d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
  80                 d->p_filesz = (Elf64_Xword) ep32->p_filesz;
  81                 d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
  82                 d->p_flags  = ep32->p_flags;
  83                 d->p_align  = (Elf64_Xword) ep32->p_align;
  84
  85         } else {
  86                 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
  87                     (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
  88                         return (NULL);
  89
  90                 if (index >= eh64->e_phnum) {
  91                         LIBELF_SET_ERROR(ARGUMENT, 0);
  92                         return (NULL);
  93                 }
  94
  95                 ep64 += index;
  96
  97                 *d = *ep64;
  98         }
  99
 100         return (d);
 101 }
 102
 103 Elf32_Phdr *
 104 elf32_newphdr(Elf *e, size_t count)
 105 {
 106         return (_libelf_newphdr(e, ELFCLASS32, count));
 107 }
 108
 109 Elf64_Phdr *
 110 elf64_newphdr(Elf *e, size_t count)
 111 {
 112         return (_libelf_newphdr(e, ELFCLASS64, count));
 113 }
 114
 115 void *
 116 gelf_newphdr(Elf *e, size_t count)
 117 {
 118         if (e == NULL) {
 119                 LIBELF_SET_ERROR(ARGUMENT, 0);
 120                 return (NULL);
 121         }
 122         return (_libelf_newphdr(e, e->e_class, count));
 123 }
 124
 125 int
 126 gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
 127 {
 128         int ec, phnum;
 129         void *ehdr;
 130         Elf32_Phdr *ph32;
 131         Elf64_Phdr *ph64;
 132
 133         if (s == NULL || e == NULL || e->e_kind != ELF_K_ELF ||
 134             ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
 135                 LIBELF_SET_ERROR(ARGUMENT, 0);
 136                 return (0);
 137         }
 138
 139         if (e->e_cmd == ELF_C_READ) {
 140                 LIBELF_SET_ERROR(MODE, 0);
 141                 return (0);
 142         }
 143
 144         if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
 145                 return (0);
 146
 147         if (ec == ELFCLASS32)
 148                 phnum = ((Elf32_Ehdr *) ehdr)->e_phnum;
 149         else
 150                 phnum = ((Elf64_Ehdr *) ehdr)->e_phnum;
 151
 152         if (ndx < 0 || ndx > phnum) {
 153                 LIBELF_SET_ERROR(ARGUMENT, 0);
 154                 return (0);
 155         }
 156
 157         (void) elf_flagphdr(e, ELF_C_SET, ELF_F_DIRTY);
 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         return (1);
 177 }