1/* Test program for elf_update function.
2   Copyright (C) 2000, 2002, 2005 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5
6   This file is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   elfutils is distributed in the hope that it will be useful, but
12   WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19#ifdef HAVE_CONFIG_H
20# include <config.h>
21#endif
22
23#include <errno.h>
24#include <fcntl.h>
25#include <libelf.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include <unistd.h>
30
31
32int
33main (int argc, char *argv[] __attribute__ ((unused)))
34{
35  const char *fname = "xxx_update2";
36  int fd;
37  Elf *elf;
38  Elf32_Ehdr *ehdr;
39  Elf32_Phdr *phdr;
40  int i;
41
42  fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666);
43  if (fd == -1)
44    {
45      printf ("cannot open `%s': %s\n", fname, strerror (errno));
46      exit (1);
47    }
48
49  elf_version (EV_CURRENT);
50
51  elf = elf_begin (fd, ELF_C_WRITE, NULL);
52  if (elf == NULL)
53    {
54      printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
55      exit (1);
56    }
57
58  /* Create an ELF header.  */
59  ehdr = elf32_newehdr (elf);
60  if (ehdr == NULL)
61    {
62      printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
63      exit (1);
64    }
65
66  /* Print the ELF header values.  */
67  if (argc > 1)
68    {
69      for (i = 0; i < EI_NIDENT; ++i)
70	printf (" %02x", ehdr->e_ident[i]);
71      printf ("\
72\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
73	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
74	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
75	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
76	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
77	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
78	      ehdr->e_shnum, ehdr->e_shstrndx);
79    }
80
81  ehdr->e_ident[0] = 42;
82  ehdr->e_ident[4] = 1;
83  ehdr->e_ident[5] = 1;
84  ehdr->e_ident[6] = 2;
85  ehdr->e_type = ET_EXEC;
86  ehdr->e_version = 1;
87  ehdr->e_ehsize = 1;
88  elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY);
89
90  /* Create the program header.  */
91  phdr = elf32_newphdr (elf, 1);
92  if (phdr == NULL)
93    {
94      printf ("cannot create program header: %s\n", elf_errmsg (-1));
95      exit (1);
96    }
97
98  phdr[0].p_type = PT_PHDR;
99  elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY);
100
101  /* Let the library compute the internal structure information.  */
102  if (elf_update (elf, ELF_C_NULL) < 0)
103    {
104      printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1));
105      exit (1);
106    }
107
108  ehdr = elf32_getehdr (elf);
109
110  phdr[0].p_offset = ehdr->e_phoff;
111  phdr[0].p_offset = ehdr->e_phoff;
112  phdr[0].p_vaddr = ehdr->e_phoff;
113  phdr[0].p_paddr = ehdr->e_phoff;
114  phdr[0].p_flags = PF_R | PF_X;
115  phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
116  phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
117  phdr[0].p_align = sizeof (Elf32_Word);
118
119  /* Write out the file.  */
120  if (elf_update (elf, ELF_C_WRITE) < 0)
121    {
122      printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
123      exit (1);
124    }
125
126  /* Print the ELF header values.  */
127  if (argc > 1)
128    {
129      for (i = 0; i < EI_NIDENT; ++i)
130	printf (" %02x", ehdr->e_ident[i]);
131      printf ("\
132\ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
133	      "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
134	      "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
135	      ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
136	      ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
137	      ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
138	      ehdr->e_shnum, ehdr->e_shstrndx);
139    }
140
141  if (elf_end (elf) != 0)
142    {
143      printf ("failure in elf_end: %s\n", elf_errmsg (-1));
144      exit (1);
145    }
146
147  unlink (fname);
148
149  return 0;
150}
151