ext/libelf/gelf_ehdr.c

/*-
 * Copyright (c) 2006 Joseph Koshy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <limits.h>

#include <assert.h>
#include "gelf.h"
#include "libelf.h"
#include <string.h>

#include "_libelf.h"

Elf32_Ehdr *
elf32_getehdr(Elf *e)
{
        return (_libelf_ehdr(e, ELFCLASS32, 0));
}

Elf64_Ehdr *
elf64_getehdr(Elf *e)
{
        return (_libelf_ehdr(e, ELFCLASS64, 0));
}

GElf_Ehdr *
gelf_getehdr(Elf *e, GElf_Ehdr *d)
{
        int ec;
        Elf32_Ehdr *eh32;
        Elf64_Ehdr *eh64;

        if (d == NULL || e == NULL ||
            ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (NULL);
        }

        if (ec == ELFCLASS32) {
                if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL)
                        return (NULL);

                (void) memcpy(d->e_ident, eh32->e_ident, sizeof(eh32->e_ident));
                d->e_type		= eh32->e_type;
                d->e_machine		= eh32->e_machine;
                d->e_version		= eh32->e_version;
                d->e_entry		= eh32->e_entry;
                d->e_phoff		= eh32->e_phoff;
                d->e_shoff		= eh32->e_shoff;
                d->e_flags		= eh32->e_flags;
                d->e_ehsize		= eh32->e_ehsize;
                d->e_phentsize		= eh32->e_phentsize;
                d->e_phnum		= eh32->e_phnum;
                d->e_shentsize		= eh32->e_shentsize;
                d->e_shnum		= eh32->e_shnum;
                d->e_shstrndx		= eh32->e_shstrndx;

                return (d);
        }

        assert(ec == ELFCLASS64);

        if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL)
                return (NULL);
        *d = *eh64;

        return (d);
}

Elf32_Ehdr *
elf32_newehdr(Elf *e)
{
        return (_libelf_ehdr(e, ELFCLASS32, 1));
}

Elf64_Ehdr *
elf64_newehdr(Elf *e)
{
        return (_libelf_ehdr(e, ELFCLASS64, 1));
}

void *
gelf_newehdr(Elf *e, int ec)
{
        if (e != NULL &&
            (ec == ELFCLASS32 || ec == ELFCLASS64))
                return (_libelf_ehdr(e, ec, 1));

        LIBELF_SET_ERROR(ARGUMENT, 0);
        return (NULL);
}

int
gelf_update_ehdr(Elf *e, GElf_Ehdr *s)
{
        int ec;
        void *ehdr;
        Elf32_Ehdr *eh32;
        Elf64_Ehdr *eh64;

        if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF ||
            ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (e->e_cmd == ELF_C_READ) {
                LIBELF_SET_ERROR(MODE, 0);
                return (0);
        }

        if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL)
                return (0);

        if (ec == ELFCLASS64) {
                eh64 = (Elf64_Ehdr *) ehdr;
                *eh64 = *s;
                return (1);
        }

        eh32 = (Elf32_Ehdr *) ehdr;

        (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident));

        eh32->e_type      = s->e_type;
        eh32->e_machine   = s->e_machine;
        eh32->e_version   = s->e_version;
        LIBELF_COPY_U32(eh32, s, e_entry);
        LIBELF_COPY_U32(eh32, s, e_phoff);
        LIBELF_COPY_U32(eh32, s, e_shoff);
        eh32->e_flags     = s->e_flags;
        eh32->e_ehsize    = s->e_ehsize;
        eh32->e_phentsize = s->e_phentsize;
        eh32->e_phnum     = s->e_phnum;
        eh32->e_shentsize = s->e_shentsize;
        eh32->e_shnum     = s->e_shnum;
        eh32->e_shstrndx  = s->e_shstrndx;

        (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY);

        return (1);
}