1 /* PPC64 specific symbolic name handling.
2 Copyright (C) 2004, 2005, 2014 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2004.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <assert.h>
35 #include <elf.h>
36 #include <stddef.h>
37 #include <string.h>
38
39 #define BACKEND ppc64_
40 #include "libebl_CPU.h"
41
42
43 /* Check for the simple reloc types. */
44 Elf_Type
ppc64_reloc_simple_type(Ebl * ebl,int type)45 ppc64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
46 {
47 switch (type)
48 {
49 case R_PPC64_ADDR64:
50 case R_PPC64_UADDR64:
51 return ELF_T_XWORD;
52 case R_PPC64_ADDR32:
53 case R_PPC64_UADDR32:
54 return ELF_T_WORD;
55 case R_PPC64_UADDR16:
56 return ELF_T_HALF;
57 default:
58 return ELF_T_NUM;
59 }
60 }
61
62
63 const char *
ppc64_dynamic_tag_name(int64_t tag,char * buf,size_t len)64 ppc64_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
65 size_t len __attribute__ ((unused)))
66 {
67 switch (tag)
68 {
69 case DT_PPC64_GLINK:
70 return "PPC64_GLINK";
71 case DT_PPC64_OPD:
72 return "PPC64_OPD";
73 case DT_PPC64_OPDSZ:
74 return "PPC64_OPDSZ";
75 case DT_PPC64_OPT:
76 return "PPC64_OPT";
77 default:
78 break;
79 }
80 return NULL;
81 }
82
83
84 bool
ppc64_dynamic_tag_check(int64_t tag)85 ppc64_dynamic_tag_check (int64_t tag)
86 {
87 return (tag == DT_PPC64_GLINK
88 || tag == DT_PPC64_OPD
89 || tag == DT_PPC64_OPDSZ
90 || tag == DT_PPC64_OPT);
91 }
92
93
94 /* Check whether given symbol's st_value and st_size are OK despite failing
95 normal checks. */
96 bool
ppc64_check_special_symbol(Elf * elf,GElf_Ehdr * ehdr,const GElf_Sym * sym,const char * name,const GElf_Shdr * destshdr)97 ppc64_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr,
98 const GElf_Sym *sym __attribute__ ((unused)),
99 const char *name __attribute__ ((unused)),
100 const GElf_Shdr *destshdr)
101 {
102 const char *sname = elf_strptr (elf, ehdr->e_shstrndx, destshdr->sh_name);
103 if (sname == NULL)
104 return false;
105 return strcmp (sname, ".opd") == 0;
106 }
107
108
109 /* Check if backend uses a bss PLT in this file. */
110 bool
ppc64_bss_plt_p(Elf * elf)111 ppc64_bss_plt_p (Elf *elf __attribute__ ((unused)))
112 {
113 return true;
114 }
115
116 /* Check whether machine flags are valid. PPC64 has three possible values:
117 0 - for unspecified ABI, or not using any specific ABI features.
118 1 - for the original ELF PPC64 ABI using function descriptors.
119 2 - for the revised ELFv2 PPC64 ABI without function descriptors. */
120 bool
ppc64_machine_flag_check(GElf_Word flags)121 ppc64_machine_flag_check (GElf_Word flags)
122 {
123 return flags == 0 || flags == 1 || flags == 2;
124 }
125
126 bool
ppc64_check_st_other_bits(unsigned char st_other)127 ppc64_check_st_other_bits (unsigned char st_other)
128 {
129 return (PPC64_LOCAL_ENTRY_OFFSET (st_other) != 0);
130 }
131