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
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
|
/* vi: set sw=4 ts=4: */
/* mips/mipsel ELF shared library loader suppport
*
Copyright (C) 2002, Steven J. Hill (sjhill@realitydiluted.com)
*
* 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.
*/
#if defined (__SUPPORT_LD_DEBUG__)
static const char *_dl_reltypes_tab[] =
{
[0] "R_MIPS_NONE", "R_MIPS_16", "R_MIPS_32",
[3] "R_MIPS_REL32", "R_MIPS_26", "R_MIPS_HI16",
[6] "R_MIPS_LO16", "R_MIPS_GPREL16", "R_MIPS_LITERAL",
[9] "R_MIPS_GOT16", "R_MIPS_PC16", "R_MIPS_CALL16",
[12] "R_MIPS_GPREL32",
[16] "R_MIPS_SHIFT5", "R_MIPS_SHIFT6", "R_MIPS_64",
[19] "R_MIPS_GOT_DISP", "R_MIPS_GOT_PAGE", "R_MIPS_GOT_OFST",
[22] "R_MIPS_GOT_HI16", "R_MIPS_GOT_LO16", "R_MIPS_SUB",
[25] "R_MIPS_INSERT_A", "R_MIPS_INSERT_B", "R_MIPS_DELETE",
[28] "R_MIPS_HIGHER", "R_MIPS_HIGHEST", "R_MIPS_CALL_HI16",
[31] "R_MIPS_CALL_LO16", "R_MIPS_SCN_DISP", "R_MIPS_REL16",
[34] "R_MIPS_ADD_IMMEDIATE", "R_MIPS_PJUMP", "R_MIPS_RELGOT",
[37] "R_MIPS_JALR",
};
static const char *
_dl_reltypes(int type)
{
static char buf[22];
const char *str;
if (type >= (int)(sizeof (_dl_reltypes_tab)/sizeof(_dl_reltypes_tab[0])) ||
NULL == (str = _dl_reltypes_tab[type]))
{
str =_dl_simple_ltoa( buf, (unsigned long)(type));
}
return str;
}
static
void debug_sym(Elf32_Sym *symtab,char *strtab,int symtab_index)
{
if(_dl_debug_symbols)
{
if(symtab_index){
_dl_dprintf(_dl_debug_file, "\n%s\n\tvalue=%x\tsize=%x\tinfo=%x\tother=%x\tshndx=%x",
strtab + symtab[symtab_index].st_name,
symtab[symtab_index].st_value,
symtab[symtab_index].st_size,
symtab[symtab_index].st_info,
symtab[symtab_index].st_other,
symtab[symtab_index].st_shndx);
}
}
}
static void debug_reloc(Elf32_Sym *symtab,char *strtab, ELF_RELOC *rpnt)
{
if(_dl_debug_reloc)
{
int symtab_index;
const char *sym;
symtab_index = ELF32_R_SYM(rpnt->r_info);
sym = symtab_index ? strtab + symtab[symtab_index].st_name : "sym=0x0";
if(_dl_debug_symbols)
_dl_dprintf(_dl_debug_file, "\n\t");
else
_dl_dprintf(_dl_debug_file, "\n%s\n\t", sym);
#ifdef ELF_USES_RELOCA
_dl_dprintf(_dl_debug_file, "%s\toffset=%x\taddend=%x",
_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
rpnt->r_offset,
rpnt->r_addend);
#else
_dl_dprintf(_dl_debug_file, "%s\toffset=%x\n",
_dl_reltypes(ELF32_R_TYPE(rpnt->r_info)),
rpnt->r_offset);
#endif
}
}
#endif
extern int _dl_linux_resolve(void);
#define OFFSET_GP_GOT 0x7ff0
unsigned long _dl_linux_resolver(unsigned long sym_index,
unsigned long old_gpreg)
{
unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
Elf32_Sym *sym;
char *strtab;
unsigned long local_gotno;
unsigned long gotsym;
unsigned long new_addr;
unsigned long instr_addr;
char **got_addr;
char *symname;
gotsym = tpnt->mips_gotsym;
local_gotno = tpnt->mips_local_gotno;
sym = ((Elf32_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,
tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
if (unlikely(!new_addr)) {
_dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
_dl_progname, symname);
_dl_exit (1);
}
/* Address of jump instruction to fix up */
instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
got_addr = (char **) instr_addr;
#if defined (__SUPPORT_LD_DEBUG__)
if (_dl_debug_bindings)
{
_dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
"\n\tpatched %x ==> %x @ %x\n", *got_addr, new_addr, got_addr);
}
if (!_dl_debug_nofixups) {
*got_addr = (char*)new_addr;
}
#else
*got_addr = (char*)new_addr;
#endif
return new_addr;
}
void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
unsigned long rel_addr, unsigned long rel_size)
{
/* Nothing to do */
return;
}
int _dl_parse_copy_information(struct dyn_elf *rpnt,
unsigned long rel_addr, unsigned long rel_size)
{
/* Nothing to do */
return 0;
}
int _dl_parse_relocation_information(struct dyn_elf *xpnt,
unsigned long rel_addr, unsigned long rel_size)
{
Elf32_Sym *symtab;
Elf32_Rel *rpnt;
char *strtab;
unsigned long i;
unsigned long *got;
unsigned long *reloc_addr=NULL;
unsigned long symbol_addr;
int reloc_type, symtab_index;
struct elf_resolve *tpnt = xpnt->dyn;
#if defined (__SUPPORT_LD_DEBUG__)
unsigned long old_val=0;
#endif
/* Now parse the relocation information */
rel_size = rel_size / sizeof(Elf32_Rel);
rpnt = (Elf32_Rel *) (rel_addr + tpnt->loadaddr);
symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
got = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
for (i = 0; i < rel_size; i++, rpnt++) {
reloc_addr = (unsigned long *) (tpnt->loadaddr +
(unsigned long) rpnt->r_offset);
reloc_type = ELF32_R_TYPE(rpnt->r_info);
symtab_index = ELF32_R_SYM(rpnt->r_info);
symbol_addr = 0;
#if defined (__SUPPORT_LD_DEBUG__)
debug_sym(symtab,strtab,symtab_index);
debug_reloc(symtab,strtab,rpnt);
if (reloc_addr)
old_val = *reloc_addr;
#endif
switch (reloc_type) {
case R_MIPS_REL32:
if (symtab_index) {
if (symtab_index < tpnt->mips_gotsym)
*reloc_addr +=
symtab[symtab_index].st_value +
(unsigned long) tpnt->loadaddr;
else {
*reloc_addr += got[symtab_index + tpnt->mips_local_gotno -
tpnt->mips_gotsym];
}
}
else {
*reloc_addr += (unsigned long) tpnt->loadaddr;
}
break;
case R_MIPS_NONE:
break;
default:
{
int reloc_type = ELF32_R_TYPE(rpnt->r_info);
_dl_dprintf(2, "\n%s: ",_dl_progname);
if (symtab_index)
_dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
#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(1);
}
};
};
#if defined (__SUPPORT_LD_DEBUG__)
if(_dl_debug_reloc && _dl_debug_detail && reloc_addr)
_dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
#endif
return 0;
}
/* Relocate the global GOT entries for the object */
void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
{
Elf32_Sym *sym;
char *strtab;
unsigned long i;
unsigned long *got_entry;
for (; tpnt ; tpnt = tpnt->next) {
/* We don't touch the dynamic linker */
if (tpnt->libtype == program_interpreter)
continue;
/* Setup the loop variables */
got_entry = (unsigned long *) (tpnt->loadaddr +
tpnt->dynamic_info[DT_PLTGOT]) + tpnt->mips_local_gotno;
sym = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] +
(unsigned long) tpnt->loadaddr) + tpnt->mips_gotsym;
strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] +
(unsigned long) tpnt->loadaddr);
i = tpnt->mips_symtabno - tpnt->mips_gotsym;
#if defined (__SUPPORT_LD_DEBUG__)
if(_dl_debug_reloc)
_dl_dprintf(2, "_dl_perform_mips_global_got_relocations for '%s'\n", tpnt->libname);
#endif
/* Relocate the global GOT entries for the object */
while(i--) {
if (sym->st_shndx == SHN_UNDEF) {
if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value) {
*got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
}
else {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
}
}
else if (sym->st_shndx == SHN_COMMON) {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
}
else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
*got_entry != sym->st_value) {
*got_entry += (unsigned long) tpnt->loadaddr;
}
else if (ELF32_ST_TYPE(sym->st_info) == STT_SECTION) {
if (sym->st_other == 0)
*got_entry += (unsigned long) tpnt->loadaddr;
}
else {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, ELF_RTYPE_CLASS_PLT);
}
got_entry++;
sym++;
}
}
}
|
