1 /* Common code for ebl reloc functions.
2 Copyright (C) 2005, 2006 Red Hat, Inc.
3 This file is part of Red Hat elfutils.
4
5 Red Hat elfutils is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by the
7 Free Software Foundation; version 2 of the License.
8
9 Red Hat elfutils is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13
14 You should have received a copy of the GNU General Public License along
15 with Red Hat elfutils; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
17
18 Red Hat elfutils is an included package of the Open Invention Network.
19 An included package of the Open Invention Network is a package for which
20 Open Invention Network licensees cross-license their patents. No patent
21 license is granted, either expressly or impliedly, by designation as an
22 included package. Should you wish to participate in the Open Invention
23 Network licensing program, please visit www.openinventionnetwork.com
24 <http://www.openinventionnetwork.com>. */
25
26 #include "libebl_CPU.h"
27 #include <assert.h>
28
29 #define R_TYPE(name) PASTE (RELOC_PREFIX, name)
30 #define PASTE(a, b) PASTE_1 (a, b)
31 #define PASTE_1(a, b) a##b
32 #define R_NAME(name) R_NAME_1 (RELOC_PREFIX, name)
33 #define R_NAME_1(prefix, type) R_NAME_2 (prefix, type)
34 #define R_NAME_2(prefix, type) #prefix #type
35
36 #define RELOC_TYPES STRINGIFIED_PASTE (BACKEND, reloc.def)
37 #define STRINGIFIED_PASTE(a, b) STRINGIFY (PASTE (a, b))
38 #define STRINGIFY(x) STRINGIFY_1 (x)
39 #define STRINGIFY_1(x) #x
40
41 /* Provide a table of reloc type names, in a PIC-friendly fashion. */
42
EBLHOOK(reloc_nametable)43 static const struct EBLHOOK(reloc_nametable)
44 {
45 char zero;
46 #define RELOC_TYPE(type, uses) \
47 char name_##type[sizeof R_NAME (type)];
48 #include RELOC_TYPES
49 #undef RELOC_TYPE
50 } EBLHOOK(reloc_nametable) =
51 {
52 '\0',
53 #define RELOC_TYPE(type, uses) R_NAME (type),
54 #include RELOC_TYPES
55 #undef RELOC_TYPE
56 };
57 #define reloc_namestr (&EBLHOOK(reloc_nametable).zero)
58
59 static const uint_fast16_t EBLHOOK(reloc_nameidx)[] =
60 {
61 #define RELOC_TYPE(type, uses) \
62 [R_TYPE (type)] = offsetof (struct EBLHOOK(reloc_nametable), name_##type),
63 #include RELOC_TYPES
64 #undef RELOC_TYPE
65 };
66 #define nreloc \
67 ((int) (sizeof EBLHOOK(reloc_nameidx) / sizeof EBLHOOK(reloc_nameidx)[0]))
68
69 #define REL (1 << (ET_REL - 1))
70 #define EXEC (1 << (ET_EXEC - 1))
71 #define DYN (1 << (ET_DYN - 1))
72 static const uint8_t EBLHOOK(reloc_valid)[] =
73 {
74 #define RELOC_TYPE(type, uses) [R_TYPE (type)] = uses,
75 #include RELOC_TYPES
76 #undef RELOC_TYPE
77 };
78 #undef REL
79 #undef EXEC
80 #undef DYN
81
82 const char *
EBLHOOK(reloc_type_name)83 EBLHOOK(reloc_type_name) (int reloc,
84 char *buf __attribute__ ((unused)),
85 size_t len __attribute__ ((unused)))
86 {
87 if (reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0)
88 return &reloc_namestr[EBLHOOK(reloc_nameidx)[reloc]];
89 return NULL;
90 }
91
92 bool
EBLHOOK(reloc_type_check)93 EBLHOOK(reloc_type_check) (int reloc)
94 {
95 return reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0;
96 }
97
98 bool
EBLHOOK(reloc_valid_use)99 EBLHOOK(reloc_valid_use) (Elf *elf, int reloc)
100 {
101 uint8_t uses = EBLHOOK(reloc_valid)[reloc];
102
103 GElf_Ehdr ehdr_mem;
104 GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
105 assert (ehdr != NULL);
106 uint8_t type = ehdr->e_type;
107
108 return type > ET_NONE && type < ET_CORE && (uses & (1 << (type - 1)));
109 }
110
111
112 bool
EBLHOOK(copy_reloc_p)113 EBLHOOK(copy_reloc_p) (int reloc)
114 {
115 return reloc == R_TYPE (COPY);
116 }
117
118 bool
EBLHOOK(none_reloc_p)119 EBLHOOK(none_reloc_p) (int reloc)
120 {
121 return reloc == R_TYPE (NONE);
122 }
123
124 #ifndef NO_RELATIVE_RELOC
125 bool
EBLHOOK(relative_reloc_p)126 EBLHOOK(relative_reloc_p) (int reloc)
127 {
128 return reloc == R_TYPE (RELATIVE);
129 }
130 #endif
131
132 static void
EBLHOOK(init_reloc)133 EBLHOOK(init_reloc) (Ebl *ebl)
134 {
135 ebl->reloc_type_name = EBLHOOK(reloc_type_name);
136 ebl->reloc_type_check = EBLHOOK(reloc_type_check);
137 ebl->reloc_valid_use = EBLHOOK(reloc_valid_use);
138 ebl->copy_reloc_p = EBLHOOK(copy_reloc_p);
139 ebl->none_reloc_p = EBLHOOK(none_reloc_p);
140 #ifndef NO_RELATIVE_RELOC
141 ebl->relative_reloc_p = EBLHOOK(relative_reloc_p);
142 #endif
143 }
144