1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/* Elf object file loading and relocation routines.
Copyright 1996, 1997 Linux International.
Contributed by Richard Henderson <rth@tamu.edu>
obj_free() added by Bjrn Ekwall <bj0rn@blox.se> March 1999
This file is part of the Linux modutils.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifndef MODUTILS_OBJ_H
#define MODUTILS_OBJ_H 1
#ident "$Id: obj.h 1.4 Tue, 18 Apr 2000 13:38:59 +1000 kaos $"
/* The relocatable object is manipulated using elfin types. */
#include <stdio.h>
#include <elf.h>
#include ELF_MACHINE_H
#ifndef ElfW
# if ELFCLASSM == ELFCLASS32
# define ElfW(x) Elf32_ ## x
# define ELFW(x) ELF32_ ## x
# else
# define ElfW(x) Elf64_ ## x
# define ELFW(x) ELF64_ ## x
# endif
#endif
#if defined(__sparc__) && !defined(__sparc_v9__)
# if ELFCLASSM == ELFCLASS32
# define ObjW(x) obj32_ ## x
# else
# define ObjW(x) obj64_ ## x
# endif
#else
#define ObjW(x) obj_ ## x
#endif
/* For some reason this is missing from lib5. */
#ifndef ELF32_ST_INFO
# define ELF32_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
#ifndef ELF64_ST_INFO
# define ELF64_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf))
#endif
struct obj_string_patch_struct;
struct obj_symbol_patch_struct;
struct obj_section
{
ElfW(Shdr) header;
const char *name;
char *contents;
struct obj_section *load_next;
int idx;
};
struct obj_symbol
{
struct obj_symbol *next; /* hash table link */
const char *name;
unsigned long value;
unsigned long size;
int secidx; /* the defining section index/module */
int info;
int ksymidx; /* for export to the kernel symtab */
int referenced; /* actually used in the link */
};
/* Hardcode the hash table size. We shouldn't be needing so many
symbols that we begin to degrade performance, and we get a big win
by giving the compiler a constant divisor. */
#define HASH_BUCKETS 521
struct obj_file
{
ElfW(Ehdr) header;
ElfW(Addr) baseaddr;
struct obj_section **sections;
struct obj_section *load_order;
struct obj_section **load_order_search_start;
struct obj_string_patch_struct *string_patches;
struct obj_symbol_patch_struct *symbol_patches;
int (*symbol_cmp)(const char *, const char *);
unsigned long (*symbol_hash)(const char *);
unsigned long local_symtab_size;
struct obj_symbol **local_symtab;
struct obj_symbol *symtab[HASH_BUCKETS];
};
enum obj_reloc
{
obj_reloc_ok,
obj_reloc_overflow,
obj_reloc_dangerous,
obj_reloc_unhandled
};
struct obj_string_patch_struct
{
struct obj_string_patch_struct *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
ElfW(Addr) string_offset;
};
struct obj_symbol_patch_struct
{
struct obj_symbol_patch_struct *next;
int reloc_secidx;
ElfW(Addr) reloc_offset;
struct obj_symbol *sym;
};
/* Generic object manipulation routines. */
#define obj_elf_hash ObjW(elf_hash)
#define obj_elf_hash_n ObjW(elf_hash_n)
#define obj_add_symbol ObjW(add_symbol)
#define obj_find_symbol ObjW(find_symbol)
#define obj_symbol_final_value ObjW(symbol_final_value)
#define obj_set_symbol_compare ObjW(set_symbol_compare)
#define obj_find_section ObjW(find_section)
#define obj_insert_section_load_order ObjW(insert_section_load_order)
#define obj_create_alloced_section ObjW(create_alloced_section)
#define obj_create_alloced_section_first \
ObjW(create_alloced_section_first)
#define obj_extend_section ObjW(extend_section)
#define obj_string_patch ObjW(string_patch)
#define obj_symbol_patch ObjW(symbol_patch)
#define obj_check_undefineds ObjW(check_undefineds)
#define obj_allocate_commons ObjW(allocate_commons)
#define obj_load_size ObjW(load_size)
#define obj_relocate ObjW(relocate)
#define obj_load ObjW(load)
#define obj_free ObjW(free)
#define obj_create_image ObjW(create_image)
#define arch_new_file ObjW(arch_new_file)
#define arch_new_section ObjW(arch_new_section)
#define arch_new_symbol ObjW(arch_new_symbol)
#define arch_apply_relocation ObjW(arch_apply_relocation)
#define arch_create_got ObjW(arch_create_got)
#define arch_init_module ObjW(arch_init_module)
#define arch_load_proc_section ObjW(arch_load_proc_section)
unsigned long obj_elf_hash (const char *);
unsigned long obj_elf_hash_n (const char *, unsigned long len);
struct obj_symbol *obj_add_symbol (struct obj_file *f, const char *name,
unsigned long symidx, int info, int secidx,
ElfW(Addr) value, unsigned long size);
struct obj_symbol *obj_find_symbol (struct obj_file *f,
const char *name);
ElfW(Addr) obj_symbol_final_value (struct obj_file *f,
struct obj_symbol *sym);
void obj_set_symbol_compare (struct obj_file *f,
int (*cmp)(const char *, const char *),
unsigned long (*hash)(const char *));
struct obj_section *obj_find_section (struct obj_file *f,
const char *name);
void obj_insert_section_load_order (struct obj_file *f,
struct obj_section *sec);
struct obj_section *obj_create_alloced_section (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
struct obj_section *obj_create_alloced_section_first (struct obj_file *f,
const char *name,
unsigned long align,
unsigned long size);
void *obj_extend_section (struct obj_section *sec, unsigned long more);
int obj_string_patch (struct obj_file *f, int secidx, ElfW(Addr) offset,
const char *string);
int obj_symbol_patch (struct obj_file *f, int secidx, ElfW(Addr) offset,
struct obj_symbol *sym);
int obj_check_undefineds (struct obj_file *f, int quiet);
void obj_allocate_commons (struct obj_file *f);
unsigned long obj_load_size (struct obj_file *f);
int obj_relocate (struct obj_file *f, ElfW(Addr) base);
struct obj_file *obj_load (FILE *f, Elf32_Half e_type);
void obj_free (struct obj_file *f);
int obj_create_image (struct obj_file *f, char *image);
int obj_kallsyms (struct obj_file *fin, struct obj_file **fout);
/* Architecture specific manipulation routines. */
struct obj_file *arch_new_file (void);
struct obj_section *arch_new_section (void);
struct obj_symbol *arch_new_symbol (void);
enum obj_reloc arch_apply_relocation (struct obj_file *f,
struct obj_section *targsec,
struct obj_section *symsec,
struct obj_symbol *sym,
ElfW(RelM) *rel, ElfW(Addr) value);
int arch_create_got (struct obj_file *f);
struct module;
int arch_init_module (struct obj_file *f, struct module *);
int arch_load_proc_section (struct obj_section *sec, FILE *fp);
#endif /* obj.h */
|
