diff options
Diffstat (limited to 'libelf/gelf_getphdr.c')
| -rw-r--r-- | libelf/gelf_getphdr.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/libelf/gelf_getphdr.c b/libelf/gelf_getphdr.c new file mode 100644 index 0000000..7b04b39 --- /dev/null +++ b/libelf/gelf_getphdr.c @@ -0,0 +1,163 @@ +/* Return program header table entry. + Copyright (C) 1998-2010 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 1998. + + Red Hat elfutils is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by the + Free Software Foundation; version 2 of the License. + + Red Hat elfutils 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + In addition, as a special exception, Red Hat, Inc. gives You the + additional right to link the code of Red Hat elfutils with code licensed + under any Open Source Initiative certified open source license + (http://www.opensource.org/licenses/index.php) which requires the + distribution of source code with any binary distribution and to + distribute linked combinations of the two. Non-GPL Code permitted under + this exception must only link to the code of Red Hat elfutils through + those well defined interfaces identified in the file named EXCEPTION + found in the source code files (the "Approved Interfaces"). The files + of Non-GPL Code may instantiate templates or use macros or inline + functions from the Approved Interfaces without causing the resulting + work to be covered by the GNU General Public License. Only Red Hat, + Inc. may make changes or additions to the list of Approved Interfaces. + Red Hat's grant of this exception is conditioned upon your not adding + any new exceptions. If you wish to add a new Approved Interface or + exception, please contact Red Hat. You must obey the GNU General Public + License in all respects for all of the Red Hat elfutils code and other + code used in conjunction with Red Hat elfutils except the Non-GPL Code + covered by this exception. If you modify this file, you may extend this + exception to your version of the file, but you are not obligated to do + so. If you do not wish to provide this exception without modification, + you must delete this exception statement from your version and license + this file solely under the GPL without exception. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <gelf.h> +#include <string.h> +#include <stdbool.h> + +#include "libelfP.h" + + +GElf_Phdr * +gelf_getphdr (elf, ndx, dst) + Elf *elf; + int ndx; + GElf_Phdr *dst; +{ + GElf_Phdr *result = NULL; + + if (elf == NULL) + return NULL; + + if (unlikely (elf->kind != ELF_K_ELF)) + { + __libelf_seterrno (ELF_E_INVALID_HANDLE); + return NULL; + } + + if (dst == NULL) + { + __libelf_seterrno (ELF_E_INVALID_OPERAND); + return NULL; + } + + rwlock_rdlock (elf->lock); + + if (elf->class == ELFCLASS32) + { + /* Copy the elements one-by-one. */ + Elf32_Phdr *phdr = elf->state.elf32.phdr; + + if (phdr == NULL) + { + rwlock_unlock (elf->lock); + phdr = INTUSE(elf32_getphdr) (elf); + if (phdr == NULL) + /* The error number is already set. */ + return NULL; + rwlock_rdlock (elf->lock); + } + + /* Test whether the index is ok. */ + size_t phnum; + if (ndx >= elf->state.elf32.ehdr->e_phnum + && (elf->state.elf32.ehdr->e_phnum != PN_XNUM + || __elf_getphdrnum_rdlock (elf, &phnum) != 0 + || (size_t) ndx >= phnum)) + { + __libelf_seterrno (ELF_E_INVALID_INDEX); + goto out; + } + + /* We know the result now. */ + result = dst; + + /* Now correct the pointer to point to the correct element. */ + phdr += ndx; + +#define COPY(Name) result->Name = phdr->Name + COPY (p_type); + COPY (p_offset); + COPY (p_vaddr); + COPY (p_paddr); + COPY (p_filesz); + COPY (p_memsz); + COPY (p_flags); + COPY (p_align); + } + else + { + /* Copy the elements one-by-one. */ + Elf64_Phdr *phdr = elf->state.elf64.phdr; + + if (phdr == NULL) + { + rwlock_unlock (elf->lock); + phdr = INTUSE(elf64_getphdr) (elf); + if (phdr == NULL) + /* The error number is already set. */ + return NULL; + rwlock_rdlock (elf->lock); + } + + /* Test whether the index is ok. */ + size_t phnum; + if (ndx >= elf->state.elf64.ehdr->e_phnum + && (elf->state.elf64.ehdr->e_phnum != PN_XNUM + || __elf_getphdrnum_rdlock (elf, &phnum) != 0 + || (size_t) ndx >= phnum)) + { + __libelf_seterrno (ELF_E_INVALID_INDEX); + goto out; + } + + /* We only have to copy the data. */ + result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr)); + } + + out: + rwlock_unlock (elf->lock); + + return result; +} |