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
|
/* vi: set sw=4 ts=4: */
/*
* Copyright (C) 2000-2006 by Erik Andersen <andersen@codepoet.org>
*
* GNU Lesser General Public License version 2.1 or later.
*/
#ifndef _LD_HASH_H_
#define _LD_HASH_H_
#ifndef RTLD_NEXT
#define RTLD_NEXT ((void*)-1)
#endif
struct init_fini {
struct elf_resolve **init_fini;
unsigned long nlist; /* Number of entries in init_fini */
};
struct dyn_elf {
struct elf_resolve * dyn;
struct dyn_elf * next_handle; /* Used by dlopen et al. */
struct init_fini init_fini;
struct dyn_elf * next;
struct dyn_elf * prev;
};
struct elf_resolve {
/* These entries must be in this order to be compatible with the interface used
by gdb to obtain the list of symbols. */
DL_LOADADDR_TYPE loadaddr; /* Base address shared object is loaded at. */
char *libname; /* Absolute file name object was found in. */
ElfW(Dyn) *dynamic_addr; /* Dynamic section of the shared object. */
struct elf_resolve * next;
struct elf_resolve * prev;
/* Nothing after this address is used by gdb. */
#if USE_TLS
/* Thread-local storage related info. */
/* Start of the initialization image. */
void *l_tls_initimage;
/* Size of the initialization image. */
size_t l_tls_initimage_size;
/* Size of the TLS block. */
size_t l_tls_blocksize;
/* Alignment requirement of the TLS block. */
size_t l_tls_align;
/* Offset of first byte module alignment. */
size_t l_tls_firstbyte_offset;
# ifndef NO_TLS_OFFSET
# define NO_TLS_OFFSET 0
# endif
/* For objects present at startup time: offset in the static TLS block. */
ptrdiff_t l_tls_offset;
/* Index of the module in the dtv array. */
size_t l_tls_modid;
/* Nonzero if _dl_init_static_tls should be called for this module */
unsigned int l_need_tls_init:1;
#endif
ElfW(Addr) mapaddr;
enum {elf_lib, elf_executable,program_interpreter, loaded_file} libtype;
struct dyn_elf * symbol_scope;
unsigned short usage_count;
unsigned short int init_flag;
unsigned long rtld_flags; /* RTLD_GLOBAL, RTLD_NOW etc. */
Elf_Symndx nbucket;
#ifdef __LDSO_GNU_HASH_SUPPORT__
/* Data needed to support GNU hash style */
Elf32_Word l_gnu_bitmask_idxbits;
Elf32_Word l_gnu_shift;
const ElfW(Addr) *l_gnu_bitmask;
union
{
const Elf32_Word *l_gnu_chain_zero;
const Elf_Symndx *elf_buckets;
};
#else
Elf_Symndx *elf_buckets;
#endif
struct init_fini_list *init_fini;
struct init_fini_list *rtld_local; /* keep tack of RTLD_LOCAL libs in same group */
/*
* These are only used with ELF style shared libraries
*/
Elf_Symndx nchain;
#ifdef __LDSO_GNU_HASH_SUPPORT__
union
{
const Elf32_Word *l_gnu_buckets;
const Elf_Symndx *chains;
};
#else
Elf_Symndx *chains;
#endif
unsigned long dynamic_info[DYNAMIC_SIZE];
unsigned long n_phent;
ElfW(Phdr) * ppnt;
ElfW(Addr) relro_addr;
size_t relro_size;
dev_t st_dev; /* device */
ino_t st_ino; /* inode */
#ifdef __powerpc__
/* this is used to store the address of relocation data words, so
* we don't have to calculate it every time, which requires a divide */
unsigned long data_words;
#endif
#ifdef __FDPIC__
/* Every loaded module holds a hashtable of function descriptors of
functions defined in it, such that it's easy to release the
memory when the module is dlclose()d. */
struct funcdesc_ht *funcdesc_ht;
#endif
};
#define RELOCS_DONE 0x000001
#define JMP_RELOCS_DONE 0x000002
#define INIT_FUNCS_CALLED 0x000004
#define FINI_FUNCS_CALLED 0x000008
#define DL_OPENED 0x000010
extern struct dyn_elf * _dl_symbol_tables;
extern struct elf_resolve * _dl_loaded_modules;
extern struct dyn_elf * _dl_handles;
extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname,
DL_LOADADDR_TYPE loadaddr, unsigned long * dynamic_info,
unsigned long dynamic_addr, unsigned long dynamic_size);
#if USE_TLS || defined __FDPIC__
#define _DL_LOOKUP_HASH_NEEDS_EXTRA_TPNT
#define _DL_LOOKUP_HASH_EXTRA_TPNT ,struct elf_resolve **tpntp
#else
#undef _DL_LOOKUP_HASH_NEEDS_EXTRA_TPNT
#define _DL_LOOKUP_HASH_EXTRA_TPNT
#endif
extern char * _dl_lookup_hash(const char * name, struct dyn_elf * rpnt,
struct elf_resolve *mytpnt, int type_class _DL_LOOKUP_HASH_EXTRA_TPNT);
static __always_inline char *_dl_find_hash(const char *name, struct dyn_elf *rpnt,
struct elf_resolve *mytpnt, int type_class,
struct elf_resolve **tpntp)
{
#ifdef _DL_LOOKUP_HASH_NEEDS_EXTRA_TPNT
return _dl_lookup_hash(name, rpnt, mytpnt, type_class, tpntp);
#else
return _dl_lookup_hash(name, rpnt, mytpnt, type_class);
#endif
}
extern int _dl_linux_dynamic_link(void);
extern char * _dl_library_path;
extern char * _dl_not_lazy;
static __inline__ int _dl_symbol(char * name)
{
if (name[0] != '_' || name[1] != 'd' || name[2] != 'l' || name[3] != '_')
return 0;
return 1;
}
#define LD_ERROR_NOFILE 1
#define LD_ERROR_NOZERO 2
#define LD_ERROR_NOTELF 3
#define LD_ERROR_NOTMAGIC 4
#define LD_ERROR_NOTDYN 5
#define LD_ERROR_MMAP_FAILED 6
#define LD_ERROR_NODYNAMIC 7
#define LD_ERROR_TLS_FAILED 8
#define LD_WRONG_RELOCS 9
#define LD_BAD_HANDLE 10
#define LD_NO_SYMBOL 11
#endif /* _LD_HASH_H_ */
|
