tests/asm-tst2.c

/* Copyright (C) 2002, 2005 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 2002.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

   Red Hat elfutils is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
   included package.  Should you wish to participate in the Open Invention
   Network licensing program, please visit www.openinventionnetwork.com
   <http://www.openinventionnetwork.com>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <fcntl.h>
#include ELFUTILS_HEADER(asm)
#include <libelf.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>


static const char fname[] = "asm-tst2-out.o";


static const GElf_Ehdr expected_ehdr =
  {
    .e_ident = { [EI_MAG0] = ELFMAG0,
		 [EI_MAG1] = ELFMAG1,
		 [EI_MAG2] = ELFMAG2,
		 [EI_MAG3] = ELFMAG3,
		 [EI_CLASS] = ELFCLASS32,
		 [EI_DATA] = ELFDATA2LSB,
		 [EI_VERSION] = EV_CURRENT },
    .e_type = ET_REL,
    .e_machine = EM_386,
    .e_version = EV_CURRENT,
    .e_shoff = 96,
    .e_ehsize = sizeof (Elf32_Ehdr),
    .e_shentsize = sizeof (Elf32_Shdr),
    .e_shnum = 3,
    .e_shstrndx = 2
  };


static const char *scnnames[3] =
  {
    [0] = "",
    [1] = ".data",
    [2] = ".shstrtab"
  };


int
main (void)
{
  AsmCtx_t *ctx;
  AsmScn_t *scn1;
  AsmScn_t *scn2;
  int result = 0;
  int fd;
  Elf *elf;
  GElf_Ehdr ehdr_mem;
  GElf_Ehdr *ehdr;
  size_t cnt;

  elf_version (EV_CURRENT);

  Ebl *ebl = ebl_openbackend_machine (EM_386);
  if (ebl == NULL)
    {
      puts ("cannot open backend library");
      return 1;
    }

  ctx = asm_begin (fname, ebl, false);
  if (ctx == NULL)
    {
      printf ("cannot create assembler context: %s\n", asm_errmsg (-1));
      return 1;
    }

  /* Create two sections.  */
  scn1 = asm_newscn (ctx, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
  scn2 = asm_newsubscn (scn1, 1);
  if (scn1 == NULL || scn2 == NULL)
    {
      printf ("cannot create section in output file: %s\n", asm_errmsg (-1));
      asm_abort (ctx);
      return 1;
    }

  /* Special alignment for the .text section.  */
  if (asm_align (scn1, 16) != 0)
    {
      printf ("cannot align .text section: %s\n", asm_errmsg (-1));
      result = 1;
    }

  /* Add a few strings.  */
  if (asm_addstrz (scn1, "one", 4) != 0)
    {
      printf ("cannot insert first string: %s\n", asm_errmsg (-1));
      result = 1;
    }
  if (asm_addstrz (scn2, "three", 0) != 0)
    {
      printf ("cannot insert second string: %s\n", asm_errmsg (-1));
      result = 1;
    }
  if (asm_addstrz (scn1, "two", 4) != 0)
    {
      printf ("cannot insert third string: %s\n", asm_errmsg (-1));
      result = 1;
    }

  /* Create the output file.  */
  if (asm_end (ctx) != 0)
    {
      printf ("cannot create output file: %s\n", asm_errmsg (-1));
      asm_abort (ctx);
      return 1;
    }

  /* Check the file.  */
  fd = open (fname, O_RDONLY);
  if (fd == -1)
    {
      printf ("cannot open generated file: %m\n");
      result = 1;
      goto out;
    }

  elf = elf_begin (fd, ELF_C_READ, NULL);
  if (elf == NULL)
    {
      printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
      result = 1;
      goto out_close;
    }
  if (elf_kind (elf) != ELF_K_ELF)
    {
      puts ("not a valid ELF file");
      result = 1;
      goto out_close2;
    }

  ehdr = gelf_getehdr (elf, &ehdr_mem);
  if (ehdr == NULL)
    {
      printf ("cannot get ELF header: %s\n", elf_errmsg (-1));
      result = 1;
      goto out_close2;
    }

  if (memcmp (ehdr, &expected_ehdr, sizeof (GElf_Ehdr)) != 0)
    {
      puts ("ELF header does not match");
      result = 1;
      goto out_close2;
    }

  for (cnt = 1; cnt < 3; ++cnt)
    {
      Elf_Scn *scn;
      GElf_Shdr shdr_mem;
      GElf_Shdr *shdr;

      scn = elf_getscn (elf, cnt);
      if (scn == NULL)
	{
	  printf ("cannot get section %Zd: %s\n", cnt, elf_errmsg (-1));
	  result = 1;
	  continue;
	}

      shdr = gelf_getshdr (scn, &shdr_mem);
      if (shdr == NULL)
	{
	  printf ("cannot get section header for section %Zd: %s\n",
		  cnt, elf_errmsg (-1));
	  result = 1;
	  continue;
	}

      if (strcmp (elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name),
		  scnnames[cnt]) != 0)
	{
	  printf ("section %Zd's name differs: %s vs %s\n", cnt,
		  elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name),
		  scnnames[cnt]);
	  result = 1;
	}

      if (shdr->sh_type != (cnt == 2 ? SHT_STRTAB : SHT_PROGBITS))
	{
	  printf ("section %Zd's type differs\n", cnt);
	  result = 1;
	}

      if ((cnt == 1 && shdr->sh_flags != (SHF_ALLOC | SHF_WRITE))
	  || (cnt == 2 && shdr->sh_flags != 0))
	{
	  printf ("section %Zd's flags differs\n", cnt);
	  result = 1;
	}

      if (shdr->sh_addr != 0)
	{
	  printf ("section %Zd's address differs\n", cnt);
	  result = 1;
	}

      if ((cnt == 1 && shdr->sh_offset != ((sizeof (Elf32_Ehdr) + 15) & ~15))
	  || (cnt == 2
	      && shdr->sh_offset != (((sizeof (Elf32_Ehdr) + 15) & ~15)
				     + strlen ("one") + 1
				     + strlen ("two") + 1
				     + strlen ("three") + 1)))
	{
	  printf ("section %Zd's offset differs\n", cnt);
	  result = 1;
	}

      if ((cnt == 1 && shdr->sh_size != (strlen ("one") + 1
					 + strlen ("two") + 1
					 + strlen ("three") + 1))
	  || (cnt == 2 && shdr->sh_size != 17))
	{
	  printf ("section %Zd's size differs\n", cnt);
	  result = 1;
	}

      if (shdr->sh_link != 0)
	{
	  printf ("section %Zd's link differs\n", cnt);
	  result = 1;
	}

      if (shdr->sh_info != 0)
	{
	  printf ("section %Zd's info differs\n", cnt);
	  result = 1;
	}

      if ((cnt == 1 && shdr->sh_addralign != 16)
	  || (cnt != 1 && shdr->sh_addralign != 1))
	{
	  printf ("section %Zd's addralign differs\n", cnt);
	  result = 1;
	}

      if (shdr->sh_entsize != 0)
	{
	  printf ("section %Zd's entsize differs\n", cnt);
	  result = 1;
	}
    }

 out_close2:
  elf_end (elf);
 out_close:
  close (fd);
 out:
  /* We don't need the file anymore.  */
  unlink (fname);

  ebl_closebackend (ebl);

  return result;
}