osprey/libelf/lib/32.newphdr.c

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/*
 * Copyright 2005 PathScale, Inc.  All Rights Reserved.
 */

/*
32.newphdr.c - implementation of the elf{32,64}_newphdr(3) functions.
Copyright (C) 1995 - 2000 Michael Riepe <michael@stud.uni-hannover.de>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <private.h>

#ifndef lint
static const char rcsid[] = "@(#) $Id: 32.newphdr.c,v 1.1.1.1 2005/10/21 19:00:00 marcel Exp $";
#endif /* lint */

static char*
_elf_newphdr(Elf *elf, size_t count, unsigned cls) {
    char *phdr = NULL;
    size_t size;

    if (!elf) {
  return NULL;
    }
    elf_assert(elf->e_magic == ELF_MAGIC);
    if (!elf->e_ehdr && !elf->e_readable) {
  seterr(ERROR_NOEHDR);
    }
    else if (elf->e_kind != ELF_K_ELF) {
  seterr(ERROR_NOTELF);
    }
    else if (elf->e_class != cls) {
  seterr(ERROR_CLASSMISMATCH);
    }
    else if (elf->e_ehdr || _elf_cook(elf)) {
  size = _msize(cls, _elf_version, ELF_T_PHDR);
  elf_assert(size);
  if (count) {
      if (!(phdr = (char*)malloc(count * size))) {
    seterr(ERROR_MEM_PHDR);
    return NULL;
      }
      memset(phdr, 0, count * size);
  }
  elf_assert(elf->e_ehdr);
  if (cls == ELFCLASS32) {
      ((Elf32_Ehdr*)elf->e_ehdr)->e_phnum = elf->e_phnum = count;
  }
#if __LIBELF64
  else if (cls == ELFCLASS64) {
      ((Elf64_Ehdr*)elf->e_ehdr)->e_phnum = elf->e_phnum = count;
  }
#endif /* __LIBELF64 */
  else {
      seterr(ERROR_UNIMPLEMENTED);
      if (phdr) {
    free(phdr);
      }
      return NULL;
  }
  if (elf->e_free_phdr) {
      elf_assert(elf->e_phdr);
      free(elf->e_phdr);
  }
  elf->e_phdr = phdr;
  elf->e_free_phdr = phdr ? 1 : 0;
  elf->e_phdr_flags |= ELF_F_DIRTY;
  elf->e_ehdr_flags |= ELF_F_DIRTY;
  return phdr;
    }
    return NULL;
}

Elf32_Phdr*
elf32_newphdr(Elf *elf, size_t count) {
    return (Elf32_Phdr*)_elf_newphdr(elf, count, ELFCLASS32);
}

#if __LIBELF64

Elf64_Phdr*
elf64_newphdr(Elf *elf, size_t count) {
    return (Elf64_Phdr*)_elf_newphdr(elf, count, ELFCLASS64);
}

unsigned long
gelf_newphdr(Elf *elf, size_t phnum) {
    if (!valid_class(elf->e_class)) {
  seterr(ERROR_UNKNOWN_CLASS);
  return 0;
    }
    if (!_elf_newphdr(elf, phnum, elf->e_class)) {
  return 0;
    }
    return 1; /* really? */
}

#endif /* __LIBELF64 */

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