/*      $NetBSD: gelf_symshndx.c,v 1.5 2024/03/03 17:37:34 christos Exp $       */

/*-
* Copyright (c) 2006,2008,2020 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.
*/

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

#include <sys/cdefs.h>

#include <assert.h>
#include <gelf.h>

#include "_libelf.h"

__RCSID("$NetBSD: gelf_symshndx.c,v 1.5 2024/03/03 17:37:34 christos Exp $");
ELFTC_VCSID("Id: gelf_symshndx.c 3977 2022-05-01 06:45:34Z jkoshy");

GElf_Sym *
gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst,
   Elf32_Word *shindex)
{
       int ec;
       Elf *e;
       size_t msz;
       Elf_Scn *scn;
       uint32_t sh_type;
       struct _Libelf_Data *ld, *lid;

       ld = (struct _Libelf_Data *) d;
       lid = (struct _Libelf_Data *) id;

       if (gelf_getsym(d, ndx, dst) == 0)
               return (NULL);

       if (shindex == NULL)
               return (dst);

       if (lid == NULL) {
               *shindex = 0;
               return (dst);
       }

       if ((scn = lid->d_scn) == NULL ||
           (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }

       ec = e->e_class;
       assert(ec == ELFCLASS32 || ec == ELFCLASS64);

       if (ec == ELFCLASS32)
               sh_type = scn->s_shdr.s_shdr32.sh_type;
       else
               sh_type = scn->s_shdr.s_shdr64.sh_type;

       if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
          id->d_type != ELF_T_WORD) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }

       if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0)
               return (NULL);

       assert(ndx >= 0);

       if (msz * (size_t) ndx >= id->d_size) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }

       *shindex = ((Elf32_Word *) id->d_buf)[ndx];

       return (dst);
}

int
gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs,
   Elf32_Word xindex)
{
       int ec;
       Elf *e;
       size_t msz;
       Elf_Scn *scn;
       uint32_t sh_type;
       struct _Libelf_Data *ld, *lid;

       ld = (struct _Libelf_Data *) d;
       lid = (struct _Libelf_Data *) id;

       if (gelf_update_sym(d, ndx, gs) == 0)
               return (0);

       if (lid == NULL || (scn = lid->d_scn) == NULL ||
           (e = scn->s_elf) == NULL || (e != ld->d_scn->s_elf)) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       ec = e->e_class;
       assert(ec == ELFCLASS32 || ec == ELFCLASS64);

       if (ec == ELFCLASS32)
               sh_type = scn->s_shdr.s_shdr32.sh_type;
       else
               sh_type = scn->s_shdr.s_shdr64.sh_type;

       if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD ||
           d->d_type != ELF_T_WORD) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       if ((msz = _libelf_msize(ELF_T_WORD, ec, e->e_version)) == 0)
               return (0);

       assert(ndx >= 0);

       if (msz * (size_t) ndx >= id->d_size) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (0);
       }

       *(((Elf32_Word *) id->d_buf) + ndx) = xindex;

       return (1);
}