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asm-tst3.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-tst3-out.o";


static const char *scnnames[5] =
  {
    [0] = "",
    [1] = ".data",
    [2] = ".strtab",
    [3] = ".symtab",
    [4] = ".shstrtab"
  };


static unsigned int scntypes[5] =
  {
    [0] = SHT_NULL,
    [1] = SHT_PROGBITS,
    [2] = SHT_STRTAB,
    [3] = SHT_SYMTAB,
    [4] = SHT_STRTAB
  };


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 with names.  */
  if (asm_newsym (scn1, "one", 4, STT_OBJECT, STB_GLOBAL) == NULL)
    {
      printf ("cannot create first name: %s\n", asm_errmsg (-1));
      result = 1;
    }
  if (asm_addstrz (scn1, "one", 4) != 0)
    {
      printf ("cannot insert first string: %s\n", asm_errmsg (-1));
      result = 1;
    }
  if (asm_newsym (scn2, "three", 6, STT_OBJECT, STB_WEAK) == NULL)
    {
      printf ("cannot create second name: %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_newsym (scn1, "two", 4, STT_OBJECT, STB_LOCAL) == NULL)
    {
      printf ("cannot create third name: %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;
    }

  for (cnt = 1; cnt < 5; ++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 != scntypes[cnt])
      {
        printf ("section %Zd's type differs\n", cnt);
        result = 1;
      }

      if ((cnt == 1 && shdr->sh_flags != (SHF_ALLOC | SHF_WRITE))
        || (cnt != 1 && 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 == 3)
      {
        Elf_Data *data;

        if (shdr->sh_link != 2)
          {
            puts ("symbol table has incorrect link");
            result = 1;
          }

        data = elf_getdata (scn, NULL);
        if (data == NULL)
          {
            puts ("cannot get data of symbol table");
            result = 1;
          }
        else
          {
            size_t inner;

            for (inner = 1;
               inner < (shdr->sh_size
                      / gelf_fsize (elf, ELF_T_SYM, 1, EV_CURRENT));
               ++inner)
            {
              GElf_Sym sym_mem;
              GElf_Sym *sym;

              sym = gelf_getsym (data, inner, &sym_mem);
              if (sym == NULL)
                {
                  printf ("cannot get symbol %zu: %s\n",
                        inner, elf_errmsg (-1));
                  result = 1;
                }
              else
                {
                  /* The order of the third and fourth entry depends
                   on how the hash table is organized.  */
                  static const char *names[4] =
                  {
                    [0] = "",
                    [1] = "two",
                    [2] = "one",
                    [3] = "three"
                  };
                  static const int info[4] =
                  {
                    [0] = GELF_ST_INFO (STB_LOCAL, STT_NOTYPE),
                    [1] = GELF_ST_INFO (STB_LOCAL, STT_OBJECT),
                    [2] = GELF_ST_INFO (STB_GLOBAL, STT_OBJECT),
                    [3] = GELF_ST_INFO (STB_WEAK, STT_OBJECT)
                  };
                  static const unsigned value[4] =
                  {
                    [0] = 0,
                    [1] = 4,
                    [2] = 0,
                    [3] = 8
                  };

                  if (strcmp (names[inner],
                          elf_strptr (elf, shdr->sh_link,
                                    sym->st_name)) != 0)
                  {
                    printf ("symbol %zu has different name\n", inner);
                    result = 1;
                  }

                  if (sym->st_value != value[inner])
                  {
                    printf ("symbol %zu has wrong value\n", inner);
                    result = 1;
                  }

                  if (sym->st_other != 0)
                  {
                    printf ("symbol %zu has wrong other info\n", inner);
                    result = 1;
                  }

                  if (sym->st_shndx != 1)
                  {
                    printf ("symbol %zu has wrong section reference\n",
                          inner);
                    result = 1;
                  }

                  if (sym->st_info != info[inner])
                  {
                    printf ("symbol %zu has wrong type or binding\n",
                          inner);
                    result = 1;
                  }

                  if ((inner != 3 && sym->st_size != 4)
                    || (inner == 3 && sym->st_size != 6))
                  {
                    printf ("symbol %zu has wrong size\n", inner);
                    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;
}

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