elf_flag.c

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· C语言 代码 · 共 163 行

/*-
 * 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 "libelf.h"

#include "_libelf.h"

unsigned int
elf_flagdata(Elf_Data *d, Elf_Cmd c, unsigned int flags)
{
        Elf *e;
        Elf_Scn *scn;
        unsigned int r;

        if (d == NULL)
                return (0);

        if ((c != ELF_C_SET && c != ELF_C_CLR) || (scn = d->d_scn) == NULL ||
            (e = scn->s_elf) == NULL || e->e_kind != ELF_K_ELF ||
            (flags & ~ELF_F_DIRTY) != 0) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (c == ELF_C_SET)
            r = scn->s_flags |= flags;
        else
            r = scn->s_flags &= ~flags;

        return (r);
}

unsigned int
elf_flagehdr(Elf *e, Elf_Cmd c, unsigned int flags)
{
        int ec;
        void *ehdr;

        if (e == NULL)
                return (0);

        if ((c != ELF_C_SET && c != ELF_C_CLR) ||
            (e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
            ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (ec == ELFCLASS32)
                ehdr = e->e_u.e_elf.e_ehdr.e_ehdr32;
        else
                ehdr = e->e_u.e_elf.e_ehdr.e_ehdr64;

        if (ehdr == NULL) {
                LIBELF_SET_ERROR(SEQUENCE, 0);
                return (0);
        }

        return (elf_flagelf(e, c, flags));
}

unsigned int
elf_flagelf(Elf *e, Elf_Cmd c, unsigned int flags)
{
        int r;

        if (e == NULL)
                return (0);

        if ((c != ELF_C_SET && c != ELF_C_CLR) ||
            (e->e_kind != ELF_K_ELF) ||
            (flags & ~(ELF_F_DIRTY|ELF_F_LAYOUT)) != 0) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (c == ELF_C_SET)
                r = e->e_flags |= flags;
        else
                r = e->e_flags &= ~flags;
        return (r);
}

unsigned int
elf_flagphdr(Elf *e, Elf_Cmd c, unsigned int flags)
{
        int ec;
        void *phdr;

        if (e == NULL)
                return (0);

        if ((c != ELF_C_SET && c != ELF_C_CLR) ||
            (e->e_kind != ELF_K_ELF) || (flags & ~ELF_F_DIRTY) != 0 ||
            ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (ec == ELFCLASS32)
                phdr = e->e_u.e_elf.e_phdr.e_phdr32;
        else
                phdr = e->e_u.e_elf.e_phdr.e_phdr64;

        if (phdr == NULL) {
                LIBELF_SET_ERROR(SEQUENCE, 0);
                return (0);
        }

        return (elf_flagelf(e, c, flags));
}

unsigned int
elf_flagscn(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
{
        int r;

        if (s == NULL)
                return (0);

        if ((c != ELF_C_SET && c != ELF_C_CLR) ||
            (flags & ~ELF_F_DIRTY) != 0) {
                LIBELF_SET_ERROR(ARGUMENT, 0);
                return (0);
        }

        if (c == ELF_C_SET)
                r = s->s_flags |= flags;
        else
                r = s->s_flags &= ~flags;
        return (r);
}

unsigned int
elf_flagshdr(Elf_Scn *s, Elf_Cmd c, unsigned int flags)
{
        return (elf_flagscn(s, c, flags));
}