/*      $NetBSD: elf_flag.c,v 1.5 2024/03/03 17:37:33 christos Exp $    */

/*-
* Copyright (c) 2006,2008-2009,2011 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 <sys/cdefs.h>

#include <libelf.h>

#include "_libelf.h"

__RCSID("$NetBSD: elf_flag.c,v 1.5 2024/03/03 17:37:33 christos Exp $");

unsigned int
elf_flagarhdr(Elf_Arhdr *a, Elf_Cmd c, unsigned int flags)
{
       unsigned int r;

       if (a == 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 = a->ar_flags |= flags;
       else
               r = a->ar_flags &= ~flags;

       return (r & LIBELF_F_API_MASK);
}

unsigned int
elf_flagdata(Elf_Data *d, Elf_Cmd c, unsigned int flags)
{
       unsigned int r;
       struct _Libelf_Data *ld;

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

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

       ld = (struct _Libelf_Data *) d;

       if (c == ELF_C_SET)
               r = ld->d_flags |= flags;
       else
               r = ld->d_flags &= ~flags;

       return (r & LIBELF_F_API_MASK);
}

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)
{
       unsigned 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_ARCHIVE | ELF_F_ARCHIVE_SYSV |
           ELF_F_DIRTY | ELF_F_LAYOUT)) != 0) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       if ((flags & ELF_F_ARCHIVE_SYSV) && (flags & ELF_F_ARCHIVE) == 0) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       if ((flags & ELF_F_ARCHIVE) && e->e_cmd != ELF_C_WRITE) {
               LIBELF_SET_ERROR(MODE, 0);
               return (0);
       }

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

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)
{
       unsigned 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 & LIBELF_F_API_MASK);
}

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

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