Line data Source code
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
44 20295 : ppc64_resolve_sym_value (Ebl *ebl, GElf_Addr *addr)
45 : {
46 20295 : if (ebl->fd_data != NULL && *addr >= ebl->fd_addr
47 715 : && *addr + sizeof (Elf64_Addr) <= ebl->fd_addr + ebl->fd_data->d_size)
48 : {
49 715 : GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (ebl->elf, &ehdr_mem);
50 715 : if (ehdr != NULL)
51 : {
52 715 : Elf_Data opd_in, opd_out;
53 715 : opd_in.d_buf = ebl->fd_data->d_buf + (*addr - ebl->fd_addr);
54 715 : opd_out.d_buf = addr;
55 715 : opd_out.d_size = opd_in.d_size = sizeof (Elf64_Addr);
56 715 : opd_out.d_type = opd_in.d_type = ELF_T_ADDR;
57 715 : if (elf64_xlatetom (&opd_out, &opd_in,
58 715 : ehdr->e_ident[EI_DATA]) != NULL)
59 715 : return true;
60 : }
61 : }
62 : return false;
63 : }
|