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
|
/*
* AVR32 ELF shared library loader suppport
*
* Copyright (C) 2004-2006 Atmel Corporation
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the above contributors may not be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got)
{
/*
* AVR32 currently does not do lazy relocation.
*/
#if 0
struct elf_resolve *tpnt = (struct elf_resolve *)got[1];
ElfW(Sym) *sym;
unsigned long local_gotno;
unsigned long gotsym;
unsigned long new_addr;
char *strtab, *symname;
unsigned long *entry;
unsigned long sym_index = got_offset / 4;
local_gotno = tpnt->dynamic_info[DT_AVR32_LOCAL_GOTNO];
gotsym = tpnt->dynamic_info[DT_AVR32_GOTSYM];
sym = ((ElfW(Sym) *)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr))
+ sym_index;
strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
symname = strtab + sym->st_name;
new_addr = (unsigned long) _dl_find_hash(symname,
&_dl_loaded_modules->symbol_scope, tpnt,
ELF_RTYPE_CLASS_PLT, NULL);
entry = (unsigned long *)(got + local_gotno + sym_index - gotsym);
*entry = new_addr;
return new_addr;
#endif
return 0;
}
static int
_dl_parse(struct elf_resolve *tpnt, struct r_scope_elem *scope,
unsigned long rel_addr, unsigned long rel_size,
int (*reloc_func)(struct elf_resolve *tpnt, struct r_scope_elem *scope,
ElfW(Rela) *rpnt, ElfW(Sym) *symtab, char *strtab))
{
ElfW(Sym) *symtab;
ElfW(Rela) *rpnt;
char *strtab;
int i;
rpnt = (ElfW(Rela) *)rel_addr;
rel_size /= sizeof(ElfW(Rela));
symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
for (i = 0; i < rel_size; i++, rpnt++) {
int symtab_index, res;
symtab_index = ELF_R_SYM(rpnt->r_info);
debug_sym(symtab, strtab, symtab_index);
debug_reloc(symtab, strtab, rpnt);
res = reloc_func(tpnt, scope, rpnt, symtab, strtab);
if (res == 0)
continue;
_dl_dprintf(2, "\n%s: ", _dl_progname);
if (symtab_index)
_dl_dprintf(2, "symbol '%s': ",
strtab + symtab[symtab_index].st_name);
if (res < 0) {
int reloc_type = ELF_R_TYPE(rpnt->r_info);
#if defined(__SUPPORT_LD_DEBUG__)
_dl_dprintf(2, "can't handle reloc type %s\n",
_dl_reltypes(reloc_type));
#else
_dl_dprintf(2, "can't handle reloc type %x\n",
reloc_type);
#endif
_dl_exit(-res);
} else {
_dl_dprintf(2, "can't resolve symbol\n");
return res;
}
}
return 0;
}
static int _dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
ElfW(Rela) *rpnt, ElfW(Sym) *symtab, char *strtab)
{
int reloc_type;
int symtab_index;
char *symname;
unsigned long *reloc_addr;
unsigned long symbol_addr;
#if defined(__SUPPORT_LD_DEBUG__)
unsigned long old_val;
#endif
struct symbol_ref sym_ref;
reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
reloc_type = ELF_R_TYPE(rpnt->r_info);
symtab_index = ELF_R_SYM(rpnt->r_info);
symbol_addr = 0;
sym_ref.sym = &symtab[symtab_index];
sym_ref.tpnt = NULL;
symname = strtab + symtab[symtab_index].st_name;
if (symtab_index) {
symbol_addr = (unsigned long)
_dl_find_hash(symname, scope, tpnt,
elf_machine_type_class(reloc_type), &sym_ref);
/* Allow undefined references to weak symbols */
if (!symbol_addr &&
ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
_dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
_dl_progname, symname);
return 0;
}
if (_dl_trace_prelink) {
_dl_debug_lookup (symname, tpnt, &symtab[symtab_index],
&sym_ref, elf_machine_type_class(reloc_type));
}
}
#if defined(__SUPPORT_LD_DEBUG__)
old_val = *reloc_addr;
#endif
switch (reloc_type) {
case R_AVR32_NONE:
break;
case R_AVR32_GLOB_DAT:
case R_AVR32_JMP_SLOT:
*reloc_addr = symbol_addr + rpnt->r_addend;
break;
case R_AVR32_RELATIVE:
*reloc_addr = (unsigned long)tpnt->loadaddr
+ rpnt->r_addend;
break;
default:
return -1;
}
#if defined(__SUPPORT_LD_DEBUG__)
if (_dl_debug_reloc && _dl_debug_detail)
_dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
old_val, *reloc_addr);
#endif
return 0;
}
void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
unsigned long rel_addr,
unsigned long rel_size)
{
/* TODO: Might want to support this in order to get faster
* startup times... */
}
int _dl_parse_relocation_information(struct dyn_elf *rpnt,
struct r_scope_elem *scope,
unsigned long rel_addr,
unsigned long rel_size)
{
return _dl_parse(rpnt->dyn, scope, rel_addr, rel_size,
_dl_do_reloc);
}
|
