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
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
|
#define IN_GCC
#include <bfd.h>
#include <bfdlink.h>
#include <string.h>
#include <stdio.h>
static bfd *exe_bfd = NULL;
struct bfd_link_info link_info;
int build_symbol_table_bfd ( char *oname ) {
int u,v;
asymbol **q;
if ( ! ( exe_bfd = bfd_openr ( oname, 0 ) ) ) {
fprintf ( stderr, "Cannot open self.\n" );
exit ( 0 );
}
if ( ! bfd_check_format ( exe_bfd, bfd_object ) ) {
fprintf ( stderr, "I'm not an object.\n" );
exit ( 0 );
}
if (!(link_info.hash = bfd_link_hash_table_create (exe_bfd))) {
fprintf ( stderr, "Cannot make hash table.\n" );
exit ( 0 );
}
if (!bfd_link_add_symbols(exe_bfd,&link_info)) {
fprintf ( stderr, "Cannot add self symbols\n.\n" );
exit ( 0 );
}
if ((u=bfd_get_symtab_upper_bound(exe_bfd))<0) {
fprintf ( stderr, "Cannot get self's symtab upper bound.\n" );
exit ( 0 );
}
fprintf ( stderr, "Allocating symbol table (%d bytes)\n", u );
q = (asymbol **) malloc ( u );
if ( ( v = bfd_canonicalize_symtab ( exe_bfd, q ) ) < 0 ) {
fprintf ( stderr, "Cannot canonicalize self's symtab.\n" );
exit ( 0 );
}
#ifdef _WIN32
for ( u=0; u < v; u++ ) {
char *c;
if ( ( c = (char *) strstr ( q[u]->name, "_" ) ) ) {
struct bfd_link_hash_entry *h;
if ( ! ( h = bfd_link_hash_lookup ( link_info.hash, q[u]->name, true, true, true ) ) )
fprintf ( stderr, "Cannot make new hash entry.\n" );
h->type=bfd_link_hash_defined;
if ( !q[u]->section )
fprintf ( stderr, "Symbol is missing section.\n" );
h->u.def.value = q[u]->value + q[u]->section->vma;
h->u.def.section = q[u]->section;
fprintf ( stderr, "Processed %s\n", q[u]->name );
}
}
#else
for (u=0;u<v;u++) {
char *c;
if ((c=(char *)strstr(q[u]->name,"@@GLIBC\n" ))) {
struct bfd_link_hash_entry *h;
*c=0;
if (!(h=bfd_link_hash_lookup(link_info.hash,q[u]->name,true,true,true)))
fprintf ( stderr, "Cannot make new hash entry.\n" );
h->type=bfd_link_hash_defined;
if (!q[u]->section)
fprintf ( stderr, "Symbol is missing section.\n" );
h->u.def.value=q[u]->value+q[u]->section->vma;
h->u.def.section=q[u]->section;
*c='@';
}
}
#endif
bfd_close ( exe_bfd );
free(q);
return 0;
}
/* align for power of two n */
static void *
round_up(void *address, unsigned long n)
{
fprintf ( stderr, "round_up: address = %d, n = %d, returning %d\n",
address, n, (void *)(((unsigned long)address + n -1) & ~(n-1)) );
fflush ( stderr );
return (void *)(((unsigned long)address + n -1) & ~(n-1)) ;
}
#define ROUND_UP(a,b) round_up(a,b)
static boolean
madd_archive_element (struct bfd_link_info * link_info,
bfd *abfd,
const char *name) {
fprintf ( stderr, "madd_archive_element\n");
return false;
}
static boolean
mmultiple_definition (struct bfd_link_info * link_info,
const char *name,
bfd *obfd,
asection *osec,
bfd_vma oval,
bfd *nbfd,
asection *nsec,
bfd_vma nval) {
fprintf ( stderr, "mmultiple_definition\n");
return false;
}
static boolean
mmultiple_common (struct bfd_link_info * link_info,
const char *name,
bfd *obfd,
enum bfd_link_hash_type otype,
bfd_vma osize,
bfd *nbfd,
enum bfd_link_hash_type ntype,
bfd_vma nsize) {
fprintf ( stderr, " mmultiple_common\n");
return false;
}
static boolean
madd_to_set (struct bfd_link_info * link_info,
struct bfd_link_hash_entry *entry,
bfd_reloc_code_real_type reloc,
bfd *abfd, asection *sec, bfd_vma value) {
fprintf ( stderr, "madd_to_set\n");
return false;
}
static boolean
mconstructor (struct bfd_link_info * link_info,boolean constructor,
const char *name, bfd *abfd, asection *sec,
bfd_vma value) {
fprintf ( stderr, "mconstructor\n");
return false;
}
static boolean
mwarning (struct bfd_link_info * link_info,
const char *warning, const char *symbol,
bfd *abfd, asection *section,
bfd_vma address) {
fprintf ( stderr, "mwarning\n");
return false;
}
static boolean
mundefined_symbol (struct bfd_link_info * link_info,
const char *name, bfd *abfd,
asection *section,
bfd_vma address,
boolean fatal) {
printf("mundefined_symbol %s is undefined\n",name);
return false;
}
static boolean
mreloc_overflow (struct bfd_link_info * link_info,
const char *name,
const char *reloc_name, bfd_vma addend,
bfd *abfd, asection *section,
bfd_vma address) {
printf("mreloc_overflow reloc for %s is overflowing\n",name);
return false;
}
static boolean
mreloc_dangerous (struct bfd_link_info * link_info,
const char *message,
bfd *abfd, asection *section,
bfd_vma address) {
printf("mreloc_dangerous reloc is dangerous %s\n",message);
return false;
}
static boolean
munattached_reloc (struct bfd_link_info * link_info,
const char *name,
bfd *abfd, asection *section,
bfd_vma address) {
fprintf ( stderr, " munattached_reloc\n");
return false;
}
static boolean
mnotice (struct bfd_link_info * link_info, const char *name,
bfd *abfd, asection *section, bfd_vma address) {
fprintf ( stderr, "mnotice\n");
return false;
}
int main ( int argc, char ** argv )
{
int init_address=-1;
int max_align = 0;
unsigned long curr_size = 0;
bfd *obj_bfd = NULL;
bfd_error_type myerr;
unsigned u = 0, v = 0;
asymbol **q = NULL;
asection *s = NULL;
static struct bfd_link_callbacks link_callbacks;
static struct bfd_link_order link_order;
void *current = NULL;
void *cfd_self = NULL;
void *cfd_start = NULL;
int cfd_size = 0;
void *the_start = NULL;
void *start_address = NULL;
void *m = NULL;
fprintf ( stderr, "In BFD fast load test.\n" );
if ( argc < 3 ) {
fprintf ( stderr, "Need an executable and an object file as arguments.\n" );
} else {
memset ( &link_info, 0, sizeof (link_info) );
memset ( &link_order, 0, sizeof (link_order) );
memset ( &link_callbacks, 0, sizeof (link_callbacks) );
bfd_init();
fprintf ( stderr, "BUILDING EXECUTABLE SYMBOL TABLE (ARGV[1]) \n\n" );
build_symbol_table_bfd ( argv[1] );
link_callbacks.add_archive_element=madd_archive_element;
link_callbacks.multiple_definition=mmultiple_definition;
link_callbacks.multiple_common=mmultiple_common;
link_callbacks.add_to_set=madd_to_set;
link_callbacks.constructor=mconstructor;
link_callbacks.warning=mwarning;
link_callbacks.undefined_symbol=mundefined_symbol;
link_callbacks.reloc_overflow=mreloc_overflow;
link_callbacks.reloc_dangerous=mreloc_dangerous;
link_callbacks.unattached_reloc=munattached_reloc;
link_callbacks.notice = mnotice;
link_info.callbacks = &link_callbacks;
link_order.type = bfd_indirect_link_order;
if ( ! ( obj_bfd = bfd_openr ( argv[2], 0 ) ) ) {
fprintf ( stderr, "Cannot open bfd.\n" );
}
if ( ( myerr = bfd_get_error () ) && myerr != 3 ) {
fprintf ( stderr, "Unknown bfd error code on openr %s %d\n.", argv[2], myerr );
}
fflush ( stderr );
if ( ! bfd_check_format ( obj_bfd, bfd_object ) ) {
fprintf ( stderr, "Unknown bfd format %s.\n", argv[2] );
}
if ( ( myerr = bfd_get_error () ) && myerr != 3 ) {
fprintf ( stderr, "Unknown bfd error code on check_format %s\n", argv[2] );
}
bfd_set_error(0);
current = NULL;
fprintf ( stderr, "CALCULATING CURRENT, MAX_ALIGN and ALLOCATING \n\n" );
for ( s= obj_bfd->sections;s;s=s->next) {
s->owner = obj_bfd;
s->output_section = ( s->flags & SEC_ALLOC) ? s : obj_bfd->sections;
s->output_offset=0;
if (!(s->flags & SEC_ALLOC))
continue;
if (max_align<s->alignment_power)
max_align=s->alignment_power;
current=round_up(current,1<<s->alignment_power);
current+=s->_raw_size;
fprintf ( stderr, "Section %s: owner = %x, output_offset = %x, output_section = %x (%s)\n",
s->name, s->owner, s->output_offset, s->output_section, s->output_section->name );
}
fprintf ( stderr, "1\n");
curr_size=(unsigned long)current;
max_align=1<<max_align;
cfd_self = 0;
cfd_start = 0;
cfd_size = curr_size + (max_align > sizeof(char *) ? max_align :0);
cfd_start = (void *) malloc ( cfd_size );
the_start = start_address = cfd_start;
fprintf ( stderr, "ALLOCATED %d bytes \n\n", cfd_size );
fprintf ( stderr,
"max_align = %d, current = %d, cfd_self = %x, "
"cfd_size = %x, cfd_start = %x\n",
max_align, current, cfd_self, cfd_size, cfd_start );
start_address = ROUND_UP ( start_address, max_align );
cfd_size = cfd_size - ( start_address - the_start );
cfd_start = (void *) start_address;
fprintf ( stderr,
"max_align = %d, current = %d, cfd_self = %x, "
"cfd_size = %x, cfd_start = %x\n",
max_align, current, cfd_self, cfd_size, cfd_start );
memset ( cfd_start, 0, cfd_size );
for ( m = start_address, s = obj_bfd->sections; s; s=s->next ) {
if (!(s->flags & SEC_ALLOC))
continue;
m=round_up(m,1<<s->alignment_power);
s->output_section->vma=(unsigned long)m;
m+=s->_raw_size;
fprintf ( stderr, "Section address %x\n", s );
fprintf ( stderr, "m loop Section %s: owner = %x, output_offset = %x, "
"output_section = %x (%s), vma = %x, m = %x\n",
s->name, s->owner, s->output_offset, s->output_section, s->output_section->name,
s->output_section->vma, m );
}
fprintf ( stderr, "\n\nDOING SOMETHING WITH THE HASHED SYMBOLS\n\n" );
if ((u=bfd_get_symtab_upper_bound(obj_bfd))<0)
fprintf ( stderr, "Cannot get symtab uppoer bound.\n" );
q = (asymbol **) alloca ( u );
if ( ( v = bfd_canonicalize_symtab ( obj_bfd, q ) ) < 0 )
fprintf ( stderr, "cannot canonicalize symtab.\n" );
fprintf ( stderr, "u = %d, v = %d\n", u, v );
for (u=0;u<v;u++) {
struct bfd_link_hash_entry *h;
fprintf ( stderr, "u loop q[%d]->name = %s\n", u, q[u]->name );
if (!strncmp("init_",q[u]->name,5)) {
init_address=q[u]->value;
continue;
}
if (!(h=bfd_link_hash_lookup(link_info.hash,q[u]->name, false, false, true)))
continue;
if (h->type!=bfd_link_hash_defined)
fprintf ( stderr, "Undefined symbol.\n" );
if (h->u.def.section) {
q[u]->value=h->u.def.value+h->u.def.section->vma;
q[u]->flags|=BSF_WEAK;
} else
fprintf ( stderr, "Symbol without section.\n" );
}
fprintf ( stderr, "\n\nDOING RELOCATIONS\n\n", cfd_size );
fflush ( stderr );
for ( s = obj_bfd->sections; s; s = s->next ) {
fprintf ( stderr, "s->name %s, s->flags = %x\n", s->name, s->flags );
if ( ! ( s->flags & SEC_LOAD ) )
continue;
link_order.u.indirect.section=s;
fprintf ( stderr, "About to get reloc section contents\n" );
fprintf ( stderr, "obj_bfd = %x, section %s, s->output_section = %x, q = %x\n",
obj_bfd, s->name, s->output_section, q);
fflush ( stderr );
if (!bfd_get_relocated_section_contents(obj_bfd, &link_info,&link_order,
(void *)(unsigned long)s->output_section->vma,0,q))
fprintf ( stderr, "Cannot get relocated section contents\n");
}
bfd_close ( obj_bfd );
printf("start address -T %x \n", cfd_start);
}
}
|
