1 /* Resolve symbol values through .opd function descriptors.
2 Copyright (C) 2013 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 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
32
33 #define BACKEND ppc64_
34 #include "libebl_CPU.h"
35
36 /* Resolve a function descriptor if addr points into the .opd section.
37 The .opd section contains function descriptors consisting of 3 addresses.
38 function, toc and chain. We are just interested in the first.
39 http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-DES
40
41 Returns true if the given address could be resolved, false otherwise.
42 */
43 bool
ppc64_resolve_sym_value(Ebl * ebl,GElf_Addr * addr)44 ppc64_resolve_sym_value (Ebl *ebl, GElf_Addr *addr)
45 {
46 if (ebl->fd_data != NULL && *addr >= ebl->fd_addr
47 && *addr + sizeof (Elf64_Addr) <= ebl->fd_addr + ebl->fd_data->d_size)
48 {
49 GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (ebl->elf, &ehdr_mem);
50 if (ehdr != NULL)
51 {
52 Elf_Data opd_in, opd_out;
53 opd_in.d_buf = ebl->fd_data->d_buf + (*addr - ebl->fd_addr);
54 opd_out.d_buf = addr;
55 opd_out.d_size = opd_in.d_size = sizeof (Elf64_Addr);
56 opd_out.d_type = opd_in.d_type = ELF_T_ADDR;
57 if (elf64_xlatetom (&opd_out, &opd_in,
58 ehdr->e_ident[EI_DATA]) != NULL)
59 return true;
60 }
61 }
62 return false;
63 }
64