1 /* Conversion functions for notes.
2 Copyright (C) 2007, 2009, 2014 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29 static void
elf_cvt_note(void * dest,const void * src,size_t len,int encode)30 elf_cvt_note (void *dest, const void *src, size_t len, int encode)
31 {
32 assert (sizeof (Elf32_Nhdr) == sizeof (Elf64_Nhdr));
33
34 while (len >= sizeof (Elf32_Nhdr))
35 {
36 (1 ? Elf32_cvt_Nhdr : Elf64_cvt_Nhdr) (dest, src, sizeof (Elf32_Nhdr),
37 encode);
38 const Elf32_Nhdr *n = encode ? src : dest;
39 Elf32_Word namesz = NOTE_ALIGN (n->n_namesz);
40 Elf32_Word descsz = NOTE_ALIGN (n->n_descsz);
41
42 len -= sizeof *n;
43 src += sizeof *n;
44 dest += sizeof *n;
45
46 if (namesz > len)
47 break;
48 len -= namesz;
49 if (descsz > len)
50 break;
51 len -= descsz;
52
53 if (src != dest)
54 memcpy (dest, src, namesz + descsz);
55
56 src += namesz + descsz;
57 dest += namesz + descsz;
58 }
59
60 /* Copy opver any leftover data unconcerted. Probably part of
61 truncated name/desc data. */
62 if (unlikely (len > 0) && src != dest)
63 memcpy (dest, src, len);
64 }
65