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/* Create new, empty section data.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stddef.h>
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#include <stdlib.h>
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#include "libelfP.h"
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Elf_Data *
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elf_newdata (Elf_Scn *scn)
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{
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Elf_Data_List *result = NULL;
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if (scn == NULL)
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return NULL;
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if (unlikely (scn->index == 0))
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{
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/* It is not allowed to add something to the 0th section. */
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__libelf_seterrno (ELF_E_NOT_NUL_SECTION);
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return NULL;
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}
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if (scn->elf->class == ELFCLASS32
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|| (offsetof (struct Elf, state.elf32.ehdr)
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== offsetof (struct Elf, state.elf64.ehdr))
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? scn->elf->state.elf32.ehdr == NULL
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: scn->elf->state.elf64.ehdr == NULL)
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{
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__libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
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return NULL;
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}
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rwlock_wrlock (scn->elf->lock);
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/* data_read is set when data has been read from the ELF image or
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when a new section has been created by elf_newscn. If data has
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been read from the ELF image, then rawdata_base will point to raw
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data. If data_read has been set by elf_newscn, then rawdata_base
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will be NULL. data_list_rear will be set by elf_getdata if the
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data has been converted, or by this function, elf_newdata, when
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new data has been added.
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Currently elf_getdata and elf_update rely on the fact that when
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data_list_read is not NULL all they have to do is walk the data
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list. They will ignore any (unread) raw data in that case.
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So we need to make sure the data list is setup if there is
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already data available. */
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if (scn->data_read
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&& scn->rawdata_base != NULL
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&& scn->data_list_rear == NULL)
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__libelf_set_data_list_rdlock (scn, 1);
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if (scn->data_read && scn->data_list_rear == NULL)
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{
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/* This means the section was created by the user and this is the
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first data. */
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result = &scn->data_list;
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result->flags = ELF_F_DIRTY;
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}
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else
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{
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/* It would be more efficient to create new data without
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reading/converting the data from the file. But then we
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have to remember this. Currently elf_getdata and
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elf_update rely on the fact that they don't have to
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load/convert any data if data_list_rear is set. */
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if (scn->data_read == 0)
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{
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if (__libelf_set_rawdata_wrlock (scn) != 0)
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/* Something went wrong. The error value is already set. */
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goto out;
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__libelf_set_data_list_rdlock (scn, 1);
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}
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/* Create a new, empty data descriptor. */
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result = (Elf_Data_List *) calloc (1, sizeof (Elf_Data_List));
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if (result == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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result->flags = ELF_F_DIRTY | ELF_F_MALLOCED;
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}
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/* Set the predefined values. */
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result->data.d.d_version = EV_CURRENT;
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result->data.s = scn;
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/* Add to the end of the list. */
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if (scn->data_list_rear != NULL)
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scn->data_list_rear->next = result;
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scn->data_list_rear = result;
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out:
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rwlock_unlock (scn->elf->lock);
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/* Please note that the following is thread safe and is also defined
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for RESULT == NULL since it still return NULL. */
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return &result->data.d;
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}
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