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

/*-
* Copyright (c) 2006,2008 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 <gelf.h>
#include <libelf.h>
#include <limits.h>
#include <stdint.h>

#include "_libelf.h"

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

Elf32_Phdr *
elf32_getphdr(Elf *e)
{
       return (_libelf_getphdr(e, ELFCLASS32));
}

Elf64_Phdr *
elf64_getphdr(Elf *e)
{
       return (_libelf_getphdr(e, ELFCLASS64));
}

GElf_Phdr *
gelf_getphdr(Elf *e, int index, GElf_Phdr *d)
{
       int ec;
       Elf32_Ehdr *eh32;
       Elf64_Ehdr *eh64;
       Elf32_Phdr *ep32;
       Elf64_Phdr *ep64;
       size_t phnum;

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

       if ((size_t)index >= phnum) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }

       if (ec == ELFCLASS32) {
               if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL ||
                   ((ep32 = _libelf_getphdr(e, ELFCLASS32)) == NULL))
                       return (NULL);

               ep32 += index;

               d->p_type   = ep32->p_type;
               d->p_offset = ep32->p_offset;
               d->p_vaddr  = (Elf64_Addr) ep32->p_vaddr;
               d->p_paddr  = (Elf64_Addr) ep32->p_paddr;
               d->p_filesz = (Elf64_Xword) ep32->p_filesz;
               d->p_memsz  = (Elf64_Xword) ep32->p_memsz;
               d->p_flags  = ep32->p_flags;
               d->p_align  = (Elf64_Xword) ep32->p_align;

       } else {
               if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL ||
                   (ep64 = _libelf_getphdr(e, ELFCLASS64)) == NULL)
                       return (NULL);

               ep64 += index;

               *d = *ep64;
       }

       return (d);
}

Elf32_Phdr *
elf32_newphdr(Elf *e, size_t count)
{
       return (_libelf_newphdr(e, ELFCLASS32, count));
}

Elf64_Phdr *
elf64_newphdr(Elf *e, size_t count)
{
       return (_libelf_newphdr(e, ELFCLASS64, count));
}

void *
gelf_newphdr(Elf *e, size_t count)
{
       if (e == NULL) {
               LIBELF_SET_ERROR(ARGUMENT, 0);
               return (NULL);
       }
       return (_libelf_newphdr(e, e->e_class, count));
}

int
gelf_update_phdr(Elf *e, int ndx, GElf_Phdr *s)
{
       int ec;
       size_t phnum;
       void *ehdr;
       Elf32_Phdr *ph32;
       Elf64_Phdr *ph64;

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

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

       if (ec == ELFCLASS64) {
               ph64 = e->e_u.e_elf.e_phdr.e_phdr64 + ndx;
               *ph64 = *s;
               return (1);
       }

       ph32 = e->e_u.e_elf.e_phdr.e_phdr32 + ndx;

       ph32->p_type     =  s->p_type;
       ph32->p_flags    =  s->p_flags;
       LIBELF_COPY_U32(ph32, s, p_offset);
       LIBELF_COPY_U32(ph32, s, p_vaddr);
       LIBELF_COPY_U32(ph32, s, p_paddr);
       LIBELF_COPY_U32(ph32, s, p_filesz);
       LIBELF_COPY_U32(ph32, s, p_memsz);
       LIBELF_COPY_U32(ph32, s, p_align);

       return (1);
}