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
43static 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
59static 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))
72static 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
82const char *
83EBLHOOK(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
92bool
93EBLHOOK(reloc_type_check) (int reloc)
94{
95  return reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0;
96}
97
98bool
99EBLHOOK(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
112bool
113EBLHOOK(copy_reloc_p) (int reloc)
114{
115  return reloc == R_TYPE (COPY);
116}
117
118bool
119EBLHOOK(none_reloc_p) (int reloc)
120{
121  return reloc == R_TYPE (NONE);
122}
123
124#ifndef NO_RELATIVE_RELOC
125bool
126EBLHOOK(relative_reloc_p) (int reloc)
127{
128  return reloc == R_TYPE (RELATIVE);
129}
130#endif
131
132static void
133EBLHOOK(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