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 #include "system.h"
31
32
33 int
main(int argc,char * argv[])34 main (int argc, char *argv[] __attribute__ ((unused)))
35 {
36 const char *fname = "xxx_update2";
37 int fd;
38 Elf *elf;
39 Elf32_Ehdr *ehdr;
40 Elf32_Phdr *phdr;
41 int i;
42
43 fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, DEFFILEMODE);
44 if (fd == -1)
45 {
46 printf ("cannot open `%s': %s\n", fname, strerror (errno));
47 exit (1);
48 }
49
50 elf_version (EV_CURRENT);
51
52 elf = elf_begin (fd, ELF_C_WRITE, NULL);
53 if (elf == NULL)
54 {
55 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1));
56 exit (1);
57 }
58
59 /* Create an ELF header. */
60 ehdr = elf32_newehdr (elf);
61 if (ehdr == NULL)
62 {
63 printf ("cannot create ELF header: %s\n", elf_errmsg (-1));
64 exit (1);
65 }
66
67 /* Print the ELF header values. */
68 if (argc > 1)
69 {
70 for (i = 0; i < EI_NIDENT; ++i)
71 printf (" %02x", ehdr->e_ident[i]);
72 printf ("\
73 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
74 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
75 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
76 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
77 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
78 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
79 ehdr->e_shnum, ehdr->e_shstrndx);
80 }
81
82 ehdr->e_ident[0] = 42;
83 ehdr->e_ident[4] = 1;
84 ehdr->e_ident[5] = 1;
85 ehdr->e_ident[6] = 2;
86 ehdr->e_type = ET_EXEC;
87 ehdr->e_version = 1;
88 ehdr->e_ehsize = 1;
89 elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY);
90
91 /* Create the program header. */
92 phdr = elf32_newphdr (elf, 1);
93 if (phdr == NULL)
94 {
95 printf ("cannot create program header: %s\n", elf_errmsg (-1));
96 exit (1);
97 }
98
99 phdr[0].p_type = PT_PHDR;
100 elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY);
101
102 /* Let the library compute the internal structure information. */
103 if (elf_update (elf, ELF_C_NULL) < 0)
104 {
105 printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1));
106 exit (1);
107 }
108
109 ehdr = elf32_getehdr (elf);
110
111 phdr[0].p_offset = ehdr->e_phoff;
112 phdr[0].p_offset = ehdr->e_phoff;
113 phdr[0].p_vaddr = ehdr->e_phoff;
114 phdr[0].p_paddr = ehdr->e_phoff;
115 phdr[0].p_flags = PF_R | PF_X;
116 phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
117 phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT);
118 phdr[0].p_align = sizeof (Elf32_Word);
119
120 /* Write out the file. */
121 if (elf_update (elf, ELF_C_WRITE) < 0)
122 {
123 printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1));
124 exit (1);
125 }
126
127 /* Print the ELF header values. */
128 if (argc > 1)
129 {
130 for (i = 0; i < EI_NIDENT; ++i)
131 printf (" %02x", ehdr->e_ident[i]);
132 printf ("\
133 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n"
134 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n"
135 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n",
136 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry,
137 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize,
138 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize,
139 ehdr->e_shnum, ehdr->e_shstrndx);
140 }
141
142 if (elf_end (elf) != 0)
143 {
144 printf ("failure in elf_end: %s\n", elf_errmsg (-1));
145 exit (1);
146 }
147
148 unlink (fname);
149
150 return 0;
151 }
152