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/* Return program header table entry.
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Copyright (C) 1998-2010, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written 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 <gelf.h>
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#include <string.h>
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#include <stdbool.h>
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#include "libelfP.h"
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GElf_Phdr *
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gelf_getphdr (Elf *elf, int ndx, GElf_Phdr *dst)
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{
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GElf_Phdr *result = NULL;
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if (elf == NULL)
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return NULL;
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if (unlikely (elf->kind != ELF_K_ELF))
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{
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__libelf_seterrno (ELF_E_INVALID_HANDLE);
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return NULL;
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}
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if (dst == NULL)
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{
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__libelf_seterrno (ELF_E_INVALID_OPERAND);
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return NULL;
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}
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rwlock_rdlock (elf->lock);
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if (elf->class == ELFCLASS32)
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{
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/* Copy the elements one-by-one. */
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Elf32_Phdr *phdr = elf->state.elf32.phdr;
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if (phdr == NULL)
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{
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rwlock_unlock (elf->lock);
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phdr = INTUSE(elf32_getphdr) (elf);
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if (phdr == NULL)
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/* The error number is already set. */
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return NULL;
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rwlock_rdlock (elf->lock);
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}
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/* Test whether the index is ok. */
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size_t phnum;
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if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0
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|| (size_t) ndx >= phnum)
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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/* We know the result now. */
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result = dst;
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/* Now correct the pointer to point to the correct element. */
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phdr += ndx;
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#define COPY(Name) result->Name = phdr->Name
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COPY (p_type);
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COPY (p_offset);
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COPY (p_vaddr);
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COPY (p_paddr);
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COPY (p_filesz);
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COPY (p_memsz);
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COPY (p_flags);
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COPY (p_align);
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}
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else
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{
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/* Copy the elements one-by-one. */
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Elf64_Phdr *phdr = elf->state.elf64.phdr;
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if (phdr == NULL)
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{
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rwlock_unlock (elf->lock);
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phdr = INTUSE(elf64_getphdr) (elf);
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if (phdr == NULL)
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/* The error number is already set. */
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return NULL;
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rwlock_rdlock (elf->lock);
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}
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/* Test whether the index is ok. */
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size_t phnum;
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if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0
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|| (size_t) ndx >= phnum)
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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/* We only have to copy the data. */
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result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr));
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}
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out:
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rwlock_unlock (elf->lock);
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return result;
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}
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