1 |
6 |
jlechner |
/* Generic symbol-table support for the BFD library.
|
2 |
|
|
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
|
3 |
|
|
2000, 2001, 2002, 2003, 2004, 2007
|
4 |
|
|
Free Software Foundation, Inc.
|
5 |
|
|
Written by Cygnus Support.
|
6 |
|
|
|
7 |
|
|
This file is part of BFD, the Binary File Descriptor library.
|
8 |
|
|
|
9 |
|
|
This program is free software; you can redistribute it and/or modify
|
10 |
|
|
it under the terms of the GNU General Public License as published by
|
11 |
|
|
the Free Software Foundation; either version 3 of the License, or
|
12 |
|
|
(at your option) any later version.
|
13 |
|
|
|
14 |
|
|
This program is distributed in the hope that it will be useful,
|
15 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
16 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
17 |
|
|
GNU General Public License for more details.
|
18 |
|
|
|
19 |
|
|
You should have received a copy of the GNU General Public License
|
20 |
|
|
along with this program; if not, write to the Free Software
|
21 |
|
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
22 |
|
|
MA 02110-1301, USA. */
|
23 |
|
|
|
24 |
|
|
/*
|
25 |
|
|
SECTION
|
26 |
|
|
Symbols
|
27 |
|
|
|
28 |
|
|
BFD tries to maintain as much symbol information as it can when
|
29 |
|
|
it moves information from file to file. BFD passes information
|
30 |
|
|
to applications though the <<asymbol>> structure. When the
|
31 |
|
|
application requests the symbol table, BFD reads the table in
|
32 |
|
|
the native form and translates parts of it into the internal
|
33 |
|
|
format. To maintain more than the information passed to
|
34 |
|
|
applications, some targets keep some information ``behind the
|
35 |
|
|
scenes'' in a structure only the particular back end knows
|
36 |
|
|
about. For example, the coff back end keeps the original
|
37 |
|
|
symbol table structure as well as the canonical structure when
|
38 |
|
|
a BFD is read in. On output, the coff back end can reconstruct
|
39 |
|
|
the output symbol table so that no information is lost, even
|
40 |
|
|
information unique to coff which BFD doesn't know or
|
41 |
|
|
understand. If a coff symbol table were read, but were written
|
42 |
|
|
through an a.out back end, all the coff specific information
|
43 |
|
|
would be lost. The symbol table of a BFD
|
44 |
|
|
is not necessarily read in until a canonicalize request is
|
45 |
|
|
made. Then the BFD back end fills in a table provided by the
|
46 |
|
|
application with pointers to the canonical information. To
|
47 |
|
|
output symbols, the application provides BFD with a table of
|
48 |
|
|
pointers to pointers to <<asymbol>>s. This allows applications
|
49 |
|
|
like the linker to output a symbol as it was read, since the ``behind
|
50 |
|
|
the scenes'' information will be still available.
|
51 |
|
|
@menu
|
52 |
|
|
@* Reading Symbols::
|
53 |
|
|
@* Writing Symbols::
|
54 |
|
|
@* Mini Symbols::
|
55 |
|
|
@* typedef asymbol::
|
56 |
|
|
@* symbol handling functions::
|
57 |
|
|
@end menu
|
58 |
|
|
|
59 |
|
|
INODE
|
60 |
|
|
Reading Symbols, Writing Symbols, Symbols, Symbols
|
61 |
|
|
SUBSECTION
|
62 |
|
|
Reading symbols
|
63 |
|
|
|
64 |
|
|
There are two stages to reading a symbol table from a BFD:
|
65 |
|
|
allocating storage, and the actual reading process. This is an
|
66 |
|
|
excerpt from an application which reads the symbol table:
|
67 |
|
|
|
68 |
|
|
| long storage_needed;
|
69 |
|
|
| asymbol **symbol_table;
|
70 |
|
|
| long number_of_symbols;
|
71 |
|
|
| long i;
|
72 |
|
|
|
|
73 |
|
|
| storage_needed = bfd_get_symtab_upper_bound (abfd);
|
74 |
|
|
|
|
75 |
|
|
| if (storage_needed < 0)
|
76 |
|
|
| FAIL
|
77 |
|
|
|
|
78 |
|
|
| if (storage_needed == 0)
|
79 |
|
|
| return;
|
80 |
|
|
|
|
81 |
|
|
| symbol_table = xmalloc (storage_needed);
|
82 |
|
|
| ...
|
83 |
|
|
| number_of_symbols =
|
84 |
|
|
| bfd_canonicalize_symtab (abfd, symbol_table);
|
85 |
|
|
|
|
86 |
|
|
| if (number_of_symbols < 0)
|
87 |
|
|
| FAIL
|
88 |
|
|
|
|
89 |
|
|
| for (i = 0; i < number_of_symbols; i++)
|
90 |
|
|
| process_symbol (symbol_table[i]);
|
91 |
|
|
|
92 |
|
|
All storage for the symbols themselves is in an objalloc
|
93 |
|
|
connected to the BFD; it is freed when the BFD is closed.
|
94 |
|
|
|
95 |
|
|
INODE
|
96 |
|
|
Writing Symbols, Mini Symbols, Reading Symbols, Symbols
|
97 |
|
|
SUBSECTION
|
98 |
|
|
Writing symbols
|
99 |
|
|
|
100 |
|
|
Writing of a symbol table is automatic when a BFD open for
|
101 |
|
|
writing is closed. The application attaches a vector of
|
102 |
|
|
pointers to pointers to symbols to the BFD being written, and
|
103 |
|
|
fills in the symbol count. The close and cleanup code reads
|
104 |
|
|
through the table provided and performs all the necessary
|
105 |
|
|
operations. The BFD output code must always be provided with an
|
106 |
|
|
``owned'' symbol: one which has come from another BFD, or one
|
107 |
|
|
which has been created using <<bfd_make_empty_symbol>>. Here is an
|
108 |
|
|
example showing the creation of a symbol table with only one element:
|
109 |
|
|
|
110 |
|
|
| #include "bfd.h"
|
111 |
|
|
| int main (void)
|
112 |
|
|
| {
|
113 |
|
|
| bfd *abfd;
|
114 |
|
|
| asymbol *ptrs[2];
|
115 |
|
|
| asymbol *new;
|
116 |
|
|
|
|
117 |
|
|
| abfd = bfd_openw ("foo","a.out-sunos-big");
|
118 |
|
|
| bfd_set_format (abfd, bfd_object);
|
119 |
|
|
| new = bfd_make_empty_symbol (abfd);
|
120 |
|
|
| new->name = "dummy_symbol";
|
121 |
|
|
| new->section = bfd_make_section_old_way (abfd, ".text");
|
122 |
|
|
| new->flags = BSF_GLOBAL;
|
123 |
|
|
| new->value = 0x12345;
|
124 |
|
|
|
|
125 |
|
|
| ptrs[0] = new;
|
126 |
|
|
| ptrs[1] = 0;
|
127 |
|
|
|
|
128 |
|
|
| bfd_set_symtab (abfd, ptrs, 1);
|
129 |
|
|
| bfd_close (abfd);
|
130 |
|
|
| return 0;
|
131 |
|
|
| }
|
132 |
|
|
|
|
133 |
|
|
| ./makesym
|
134 |
|
|
| nm foo
|
135 |
|
|
| 00012345 A dummy_symbol
|
136 |
|
|
|
137 |
|
|
Many formats cannot represent arbitrary symbol information; for
|
138 |
|
|
instance, the <<a.out>> object format does not allow an
|
139 |
|
|
arbitrary number of sections. A symbol pointing to a section
|
140 |
|
|
which is not one of <<.text>>, <<.data>> or <<.bss>> cannot
|
141 |
|
|
be described.
|
142 |
|
|
|
143 |
|
|
INODE
|
144 |
|
|
Mini Symbols, typedef asymbol, Writing Symbols, Symbols
|
145 |
|
|
SUBSECTION
|
146 |
|
|
Mini Symbols
|
147 |
|
|
|
148 |
|
|
Mini symbols provide read-only access to the symbol table.
|
149 |
|
|
They use less memory space, but require more time to access.
|
150 |
|
|
They can be useful for tools like nm or objdump, which may
|
151 |
|
|
have to handle symbol tables of extremely large executables.
|
152 |
|
|
|
153 |
|
|
The <<bfd_read_minisymbols>> function will read the symbols
|
154 |
|
|
into memory in an internal form. It will return a <<void *>>
|
155 |
|
|
pointer to a block of memory, a symbol count, and the size of
|
156 |
|
|
each symbol. The pointer is allocated using <<malloc>>, and
|
157 |
|
|
should be freed by the caller when it is no longer needed.
|
158 |
|
|
|
159 |
|
|
The function <<bfd_minisymbol_to_symbol>> will take a pointer
|
160 |
|
|
to a minisymbol, and a pointer to a structure returned by
|
161 |
|
|
<<bfd_make_empty_symbol>>, and return a <<asymbol>> structure.
|
162 |
|
|
The return value may or may not be the same as the value from
|
163 |
|
|
<<bfd_make_empty_symbol>> which was passed in.
|
164 |
|
|
|
165 |
|
|
*/
|
166 |
|
|
|
167 |
|
|
/*
|
168 |
|
|
DOCDD
|
169 |
|
|
INODE
|
170 |
|
|
typedef asymbol, symbol handling functions, Mini Symbols, Symbols
|
171 |
|
|
|
172 |
|
|
*/
|
173 |
|
|
/*
|
174 |
|
|
SUBSECTION
|
175 |
|
|
typedef asymbol
|
176 |
|
|
|
177 |
|
|
An <<asymbol>> has the form:
|
178 |
|
|
|
179 |
|
|
*/
|
180 |
|
|
|
181 |
|
|
/*
|
182 |
|
|
CODE_FRAGMENT
|
183 |
|
|
|
184 |
|
|
.
|
185 |
|
|
.typedef struct bfd_symbol
|
186 |
|
|
.{
|
187 |
|
|
. {* A pointer to the BFD which owns the symbol. This information
|
188 |
|
|
. is necessary so that a back end can work out what additional
|
189 |
|
|
. information (invisible to the application writer) is carried
|
190 |
|
|
. with the symbol.
|
191 |
|
|
.
|
192 |
|
|
. This field is *almost* redundant, since you can use section->owner
|
193 |
|
|
. instead, except that some symbols point to the global sections
|
194 |
|
|
. bfd_{abs,com,und}_section. This could be fixed by making
|
195 |
|
|
. these globals be per-bfd (or per-target-flavor). FIXME. *}
|
196 |
|
|
. struct bfd *the_bfd; {* Use bfd_asymbol_bfd(sym) to access this field. *}
|
197 |
|
|
.
|
198 |
|
|
. {* The text of the symbol. The name is left alone, and not copied; the
|
199 |
|
|
. application may not alter it. *}
|
200 |
|
|
. const char *name;
|
201 |
|
|
.
|
202 |
|
|
. {* The value of the symbol. This really should be a union of a
|
203 |
|
|
. numeric value with a pointer, since some flags indicate that
|
204 |
|
|
. a pointer to another symbol is stored here. *}
|
205 |
|
|
. symvalue value;
|
206 |
|
|
.
|
207 |
|
|
. {* Attributes of a symbol. *}
|
208 |
|
|
.#define BSF_NO_FLAGS 0x00
|
209 |
|
|
.
|
210 |
|
|
. {* The symbol has local scope; <<static>> in <<C>>. The value
|
211 |
|
|
. is the offset into the section of the data. *}
|
212 |
|
|
.#define BSF_LOCAL 0x01
|
213 |
|
|
.
|
214 |
|
|
. {* The symbol has global scope; initialized data in <<C>>. The
|
215 |
|
|
. value is the offset into the section of the data. *}
|
216 |
|
|
.#define BSF_GLOBAL 0x02
|
217 |
|
|
.
|
218 |
|
|
. {* The symbol has global scope and is exported. The value is
|
219 |
|
|
. the offset into the section of the data. *}
|
220 |
|
|
.#define BSF_EXPORT BSF_GLOBAL {* No real difference. *}
|
221 |
|
|
.
|
222 |
|
|
. {* A normal C symbol would be one of:
|
223 |
|
|
. <<BSF_LOCAL>>, <<BSF_FORT_COMM>>, <<BSF_UNDEFINED>> or
|
224 |
|
|
. <<BSF_GLOBAL>>. *}
|
225 |
|
|
.
|
226 |
|
|
. {* The symbol is a debugging record. The value has an arbitrary
|
227 |
|
|
. meaning, unless BSF_DEBUGGING_RELOC is also set. *}
|
228 |
|
|
.#define BSF_DEBUGGING 0x08
|
229 |
|
|
.
|
230 |
|
|
. {* The symbol denotes a function entry point. Used in ELF,
|
231 |
|
|
. perhaps others someday. *}
|
232 |
|
|
.#define BSF_FUNCTION 0x10
|
233 |
|
|
.
|
234 |
|
|
. {* Used by the linker. *}
|
235 |
|
|
.#define BSF_KEEP 0x20
|
236 |
|
|
.#define BSF_KEEP_G 0x40
|
237 |
|
|
.
|
238 |
|
|
. {* A weak global symbol, overridable without warnings by
|
239 |
|
|
. a regular global symbol of the same name. *}
|
240 |
|
|
.#define BSF_WEAK 0x80
|
241 |
|
|
.
|
242 |
|
|
. {* This symbol was created to point to a section, e.g. ELF's
|
243 |
|
|
. STT_SECTION symbols. *}
|
244 |
|
|
.#define BSF_SECTION_SYM 0x100
|
245 |
|
|
.
|
246 |
|
|
. {* The symbol used to be a common symbol, but now it is
|
247 |
|
|
. allocated. *}
|
248 |
|
|
.#define BSF_OLD_COMMON 0x200
|
249 |
|
|
.
|
250 |
|
|
. {* The default value for common data. *}
|
251 |
|
|
.#define BFD_FORT_COMM_DEFAULT_VALUE 0
|
252 |
|
|
.
|
253 |
|
|
. {* In some files the type of a symbol sometimes alters its
|
254 |
|
|
. location in an output file - ie in coff a <<ISFCN>> symbol
|
255 |
|
|
. which is also <<C_EXT>> symbol appears where it was
|
256 |
|
|
. declared and not at the end of a section. This bit is set
|
257 |
|
|
. by the target BFD part to convey this information. *}
|
258 |
|
|
.#define BSF_NOT_AT_END 0x400
|
259 |
|
|
.
|
260 |
|
|
. {* Signal that the symbol is the label of constructor section. *}
|
261 |
|
|
.#define BSF_CONSTRUCTOR 0x800
|
262 |
|
|
.
|
263 |
|
|
. {* Signal that the symbol is a warning symbol. The name is a
|
264 |
|
|
. warning. The name of the next symbol is the one to warn about;
|
265 |
|
|
. if a reference is made to a symbol with the same name as the next
|
266 |
|
|
. symbol, a warning is issued by the linker. *}
|
267 |
|
|
.#define BSF_WARNING 0x1000
|
268 |
|
|
.
|
269 |
|
|
. {* Signal that the symbol is indirect. This symbol is an indirect
|
270 |
|
|
. pointer to the symbol with the same name as the next symbol. *}
|
271 |
|
|
.#define BSF_INDIRECT 0x2000
|
272 |
|
|
.
|
273 |
|
|
. {* BSF_FILE marks symbols that contain a file name. This is used
|
274 |
|
|
. for ELF STT_FILE symbols. *}
|
275 |
|
|
.#define BSF_FILE 0x4000
|
276 |
|
|
.
|
277 |
|
|
. {* Symbol is from dynamic linking information. *}
|
278 |
|
|
.#define BSF_DYNAMIC 0x8000
|
279 |
|
|
.
|
280 |
|
|
. {* The symbol denotes a data object. Used in ELF, and perhaps
|
281 |
|
|
. others someday. *}
|
282 |
|
|
.#define BSF_OBJECT 0x10000
|
283 |
|
|
.
|
284 |
|
|
. {* This symbol is a debugging symbol. The value is the offset
|
285 |
|
|
. into the section of the data. BSF_DEBUGGING should be set
|
286 |
|
|
. as well. *}
|
287 |
|
|
.#define BSF_DEBUGGING_RELOC 0x20000
|
288 |
|
|
.
|
289 |
|
|
. {* This symbol is thread local. Used in ELF. *}
|
290 |
|
|
.#define BSF_THREAD_LOCAL 0x40000
|
291 |
|
|
.
|
292 |
|
|
. {* This symbol represents a complex relocation expression,
|
293 |
|
|
. with the expression tree serialized in the symbol name. *}
|
294 |
|
|
.#define BSF_RELC 0x80000
|
295 |
|
|
.
|
296 |
|
|
. {* This symbol represents a signed complex relocation expression,
|
297 |
|
|
. with the expression tree serialized in the symbol name. *}
|
298 |
|
|
.#define BSF_SRELC 0x100000
|
299 |
|
|
.
|
300 |
|
|
. {* This symbol was created by bfd_get_synthetic_symtab. *}
|
301 |
|
|
.#define BSF_SYNTHETIC 0x200000
|
302 |
|
|
.
|
303 |
|
|
. flagword flags;
|
304 |
|
|
.
|
305 |
|
|
. {* A pointer to the section to which this symbol is
|
306 |
|
|
. relative. This will always be non NULL, there are special
|
307 |
|
|
. sections for undefined and absolute symbols. *}
|
308 |
|
|
. struct bfd_section *section;
|
309 |
|
|
.
|
310 |
|
|
. {* Back end special data. *}
|
311 |
|
|
. union
|
312 |
|
|
. {
|
313 |
|
|
. void *p;
|
314 |
|
|
. bfd_vma i;
|
315 |
|
|
. }
|
316 |
|
|
. udata;
|
317 |
|
|
.}
|
318 |
|
|
.asymbol;
|
319 |
|
|
.
|
320 |
|
|
*/
|
321 |
|
|
|
322 |
|
|
#include "sysdep.h"
|
323 |
|
|
#include "bfd.h"
|
324 |
|
|
#include "libbfd.h"
|
325 |
|
|
#include "safe-ctype.h"
|
326 |
|
|
#include "bfdlink.h"
|
327 |
|
|
#include "aout/stab_gnu.h"
|
328 |
|
|
|
329 |
|
|
/*
|
330 |
|
|
DOCDD
|
331 |
|
|
INODE
|
332 |
|
|
symbol handling functions, , typedef asymbol, Symbols
|
333 |
|
|
SUBSECTION
|
334 |
|
|
Symbol handling functions
|
335 |
|
|
*/
|
336 |
|
|
|
337 |
|
|
/*
|
338 |
|
|
FUNCTION
|
339 |
|
|
bfd_get_symtab_upper_bound
|
340 |
|
|
|
341 |
|
|
DESCRIPTION
|
342 |
|
|
Return the number of bytes required to store a vector of pointers
|
343 |
|
|
to <<asymbols>> for all the symbols in the BFD @var{abfd},
|
344 |
|
|
including a terminal NULL pointer. If there are no symbols in
|
345 |
|
|
the BFD, then return 0. If an error occurs, return -1.
|
346 |
|
|
|
347 |
|
|
.#define bfd_get_symtab_upper_bound(abfd) \
|
348 |
|
|
. BFD_SEND (abfd, _bfd_get_symtab_upper_bound, (abfd))
|
349 |
|
|
.
|
350 |
|
|
*/
|
351 |
|
|
|
352 |
|
|
/*
|
353 |
|
|
FUNCTION
|
354 |
|
|
bfd_is_local_label
|
355 |
|
|
|
356 |
|
|
SYNOPSIS
|
357 |
|
|
bfd_boolean bfd_is_local_label (bfd *abfd, asymbol *sym);
|
358 |
|
|
|
359 |
|
|
DESCRIPTION
|
360 |
|
|
Return TRUE if the given symbol @var{sym} in the BFD @var{abfd} is
|
361 |
|
|
a compiler generated local label, else return FALSE.
|
362 |
|
|
*/
|
363 |
|
|
|
364 |
|
|
bfd_boolean
|
365 |
|
|
bfd_is_local_label (bfd *abfd, asymbol *sym)
|
366 |
|
|
{
|
367 |
|
|
/* The BSF_SECTION_SYM check is needed for IA-64, where every label that
|
368 |
|
|
starts with '.' is local. This would accidentally catch section names
|
369 |
|
|
if we didn't reject them here. */
|
370 |
|
|
if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_FILE | BSF_SECTION_SYM)) != 0)
|
371 |
|
|
return FALSE;
|
372 |
|
|
if (sym->name == NULL)
|
373 |
|
|
return FALSE;
|
374 |
|
|
return bfd_is_local_label_name (abfd, sym->name);
|
375 |
|
|
}
|
376 |
|
|
|
377 |
|
|
/*
|
378 |
|
|
FUNCTION
|
379 |
|
|
bfd_is_local_label_name
|
380 |
|
|
|
381 |
|
|
SYNOPSIS
|
382 |
|
|
bfd_boolean bfd_is_local_label_name (bfd *abfd, const char *name);
|
383 |
|
|
|
384 |
|
|
DESCRIPTION
|
385 |
|
|
Return TRUE if a symbol with the name @var{name} in the BFD
|
386 |
|
|
@var{abfd} is a compiler generated local label, else return
|
387 |
|
|
FALSE. This just checks whether the name has the form of a
|
388 |
|
|
local label.
|
389 |
|
|
|
390 |
|
|
.#define bfd_is_local_label_name(abfd, name) \
|
391 |
|
|
. BFD_SEND (abfd, _bfd_is_local_label_name, (abfd, name))
|
392 |
|
|
.
|
393 |
|
|
*/
|
394 |
|
|
|
395 |
|
|
/*
|
396 |
|
|
FUNCTION
|
397 |
|
|
bfd_is_target_special_symbol
|
398 |
|
|
|
399 |
|
|
SYNOPSIS
|
400 |
|
|
bfd_boolean bfd_is_target_special_symbol (bfd *abfd, asymbol *sym);
|
401 |
|
|
|
402 |
|
|
DESCRIPTION
|
403 |
|
|
Return TRUE iff a symbol @var{sym} in the BFD @var{abfd} is something
|
404 |
|
|
special to the particular target represented by the BFD. Such symbols
|
405 |
|
|
should normally not be mentioned to the user.
|
406 |
|
|
|
407 |
|
|
.#define bfd_is_target_special_symbol(abfd, sym) \
|
408 |
|
|
. BFD_SEND (abfd, _bfd_is_target_special_symbol, (abfd, sym))
|
409 |
|
|
.
|
410 |
|
|
*/
|
411 |
|
|
|
412 |
|
|
/*
|
413 |
|
|
FUNCTION
|
414 |
|
|
bfd_canonicalize_symtab
|
415 |
|
|
|
416 |
|
|
DESCRIPTION
|
417 |
|
|
Read the symbols from the BFD @var{abfd}, and fills in
|
418 |
|
|
the vector @var{location} with pointers to the symbols and
|
419 |
|
|
a trailing NULL.
|
420 |
|
|
Return the actual number of symbol pointers, not
|
421 |
|
|
including the NULL.
|
422 |
|
|
|
423 |
|
|
.#define bfd_canonicalize_symtab(abfd, location) \
|
424 |
|
|
. BFD_SEND (abfd, _bfd_canonicalize_symtab, (abfd, location))
|
425 |
|
|
.
|
426 |
|
|
*/
|
427 |
|
|
|
428 |
|
|
/*
|
429 |
|
|
FUNCTION
|
430 |
|
|
bfd_set_symtab
|
431 |
|
|
|
432 |
|
|
SYNOPSIS
|
433 |
|
|
bfd_boolean bfd_set_symtab
|
434 |
|
|
(bfd *abfd, asymbol **location, unsigned int count);
|
435 |
|
|
|
436 |
|
|
DESCRIPTION
|
437 |
|
|
Arrange that when the output BFD @var{abfd} is closed,
|
438 |
|
|
the table @var{location} of @var{count} pointers to symbols
|
439 |
|
|
will be written.
|
440 |
|
|
*/
|
441 |
|
|
|
442 |
|
|
bfd_boolean
|
443 |
|
|
bfd_set_symtab (bfd *abfd, asymbol **location, unsigned int symcount)
|
444 |
|
|
{
|
445 |
|
|
if (abfd->format != bfd_object || bfd_read_p (abfd))
|
446 |
|
|
{
|
447 |
|
|
bfd_set_error (bfd_error_invalid_operation);
|
448 |
|
|
return FALSE;
|
449 |
|
|
}
|
450 |
|
|
|
451 |
|
|
bfd_get_outsymbols (abfd) = location;
|
452 |
|
|
bfd_get_symcount (abfd) = symcount;
|
453 |
|
|
return TRUE;
|
454 |
|
|
}
|
455 |
|
|
|
456 |
|
|
/*
|
457 |
|
|
FUNCTION
|
458 |
|
|
bfd_print_symbol_vandf
|
459 |
|
|
|
460 |
|
|
SYNOPSIS
|
461 |
|
|
void bfd_print_symbol_vandf (bfd *abfd, void *file, asymbol *symbol);
|
462 |
|
|
|
463 |
|
|
DESCRIPTION
|
464 |
|
|
Print the value and flags of the @var{symbol} supplied to the
|
465 |
|
|
stream @var{file}.
|
466 |
|
|
*/
|
467 |
|
|
void
|
468 |
|
|
bfd_print_symbol_vandf (bfd *abfd, void *arg, asymbol *symbol)
|
469 |
|
|
{
|
470 |
|
|
FILE *file = arg;
|
471 |
|
|
|
472 |
|
|
flagword type = symbol->flags;
|
473 |
|
|
|
474 |
|
|
if (symbol->section != NULL)
|
475 |
|
|
bfd_fprintf_vma (abfd, file, symbol->value + symbol->section->vma);
|
476 |
|
|
else
|
477 |
|
|
bfd_fprintf_vma (abfd, file, symbol->value);
|
478 |
|
|
|
479 |
|
|
/* This presumes that a symbol can not be both BSF_DEBUGGING and
|
480 |
|
|
BSF_DYNAMIC, nor more than one of BSF_FUNCTION, BSF_FILE, and
|
481 |
|
|
BSF_OBJECT. */
|
482 |
|
|
fprintf (file, " %c%c%c%c%c%c%c",
|
483 |
|
|
((type & BSF_LOCAL)
|
484 |
|
|
? (type & BSF_GLOBAL) ? '!' : 'l'
|
485 |
|
|
: (type & BSF_GLOBAL) ? 'g' : ' '),
|
486 |
|
|
(type & BSF_WEAK) ? 'w' : ' ',
|
487 |
|
|
(type & BSF_CONSTRUCTOR) ? 'C' : ' ',
|
488 |
|
|
(type & BSF_WARNING) ? 'W' : ' ',
|
489 |
|
|
(type & BSF_INDIRECT) ? 'I' : ' ',
|
490 |
|
|
(type & BSF_DEBUGGING) ? 'd' : (type & BSF_DYNAMIC) ? 'D' : ' ',
|
491 |
|
|
((type & BSF_FUNCTION)
|
492 |
|
|
? 'F'
|
493 |
|
|
: ((type & BSF_FILE)
|
494 |
|
|
? 'f'
|
495 |
|
|
: ((type & BSF_OBJECT) ? 'O' : ' '))));
|
496 |
|
|
}
|
497 |
|
|
|
498 |
|
|
/*
|
499 |
|
|
FUNCTION
|
500 |
|
|
bfd_make_empty_symbol
|
501 |
|
|
|
502 |
|
|
DESCRIPTION
|
503 |
|
|
Create a new <<asymbol>> structure for the BFD @var{abfd}
|
504 |
|
|
and return a pointer to it.
|
505 |
|
|
|
506 |
|
|
This routine is necessary because each back end has private
|
507 |
|
|
information surrounding the <<asymbol>>. Building your own
|
508 |
|
|
<<asymbol>> and pointing to it will not create the private
|
509 |
|
|
information, and will cause problems later on.
|
510 |
|
|
|
511 |
|
|
.#define bfd_make_empty_symbol(abfd) \
|
512 |
|
|
. BFD_SEND (abfd, _bfd_make_empty_symbol, (abfd))
|
513 |
|
|
.
|
514 |
|
|
*/
|
515 |
|
|
|
516 |
|
|
/*
|
517 |
|
|
FUNCTION
|
518 |
|
|
_bfd_generic_make_empty_symbol
|
519 |
|
|
|
520 |
|
|
SYNOPSIS
|
521 |
|
|
asymbol *_bfd_generic_make_empty_symbol (bfd *);
|
522 |
|
|
|
523 |
|
|
DESCRIPTION
|
524 |
|
|
Create a new <<asymbol>> structure for the BFD @var{abfd}
|
525 |
|
|
and return a pointer to it. Used by core file routines,
|
526 |
|
|
binary back-end and anywhere else where no private info
|
527 |
|
|
is needed.
|
528 |
|
|
*/
|
529 |
|
|
|
530 |
|
|
asymbol *
|
531 |
|
|
_bfd_generic_make_empty_symbol (bfd *abfd)
|
532 |
|
|
{
|
533 |
|
|
bfd_size_type amt = sizeof (asymbol);
|
534 |
|
|
asymbol *new = bfd_zalloc (abfd, amt);
|
535 |
|
|
if (new)
|
536 |
|
|
new->the_bfd = abfd;
|
537 |
|
|
return new;
|
538 |
|
|
}
|
539 |
|
|
|
540 |
|
|
/*
|
541 |
|
|
FUNCTION
|
542 |
|
|
bfd_make_debug_symbol
|
543 |
|
|
|
544 |
|
|
DESCRIPTION
|
545 |
|
|
Create a new <<asymbol>> structure for the BFD @var{abfd},
|
546 |
|
|
to be used as a debugging symbol. Further details of its use have
|
547 |
|
|
yet to be worked out.
|
548 |
|
|
|
549 |
|
|
.#define bfd_make_debug_symbol(abfd,ptr,size) \
|
550 |
|
|
. BFD_SEND (abfd, _bfd_make_debug_symbol, (abfd, ptr, size))
|
551 |
|
|
.
|
552 |
|
|
*/
|
553 |
|
|
|
554 |
|
|
struct section_to_type
|
555 |
|
|
{
|
556 |
|
|
const char *section;
|
557 |
|
|
char type;
|
558 |
|
|
};
|
559 |
|
|
|
560 |
|
|
/* Map section names to POSIX/BSD single-character symbol types.
|
561 |
|
|
This table is probably incomplete. It is sorted for convenience of
|
562 |
|
|
adding entries. Since it is so short, a linear search is used. */
|
563 |
|
|
static const struct section_to_type stt[] =
|
564 |
|
|
{
|
565 |
|
|
{".bss", 'b'},
|
566 |
|
|
{"code", 't'}, /* MRI .text */
|
567 |
|
|
{".data", 'd'},
|
568 |
|
|
{"*DEBUG*", 'N'},
|
569 |
|
|
{".debug", 'N'}, /* MSVC's .debug (non-standard debug syms) */
|
570 |
|
|
{".drectve", 'i'}, /* MSVC's .drective section */
|
571 |
|
|
{".edata", 'e'}, /* MSVC's .edata (export) section */
|
572 |
|
|
{".fini", 't'}, /* ELF fini section */
|
573 |
|
|
{".idata", 'i'}, /* MSVC's .idata (import) section */
|
574 |
|
|
{".init", 't'}, /* ELF init section */
|
575 |
|
|
{".pdata", 'p'}, /* MSVC's .pdata (stack unwind) section */
|
576 |
|
|
{".rdata", 'r'}, /* Read only data. */
|
577 |
|
|
{".rodata", 'r'}, /* Read only data. */
|
578 |
|
|
{".sbss", 's'}, /* Small BSS (uninitialized data). */
|
579 |
|
|
{".scommon", 'c'}, /* Small common. */
|
580 |
|
|
{".sdata", 'g'}, /* Small initialized data. */
|
581 |
|
|
{".text", 't'},
|
582 |
|
|
{"vars", 'd'}, /* MRI .data */
|
583 |
|
|
{"zerovars", 'b'}, /* MRI .bss */
|
584 |
|
|
{0, 0}
|
585 |
|
|
};
|
586 |
|
|
|
587 |
|
|
/* Return the single-character symbol type corresponding to
|
588 |
|
|
section S, or '?' for an unknown COFF section.
|
589 |
|
|
|
590 |
|
|
Check for any leading string which matches, so .text5 returns
|
591 |
|
|
't' as well as .text */
|
592 |
|
|
|
593 |
|
|
static char
|
594 |
|
|
coff_section_type (const char *s)
|
595 |
|
|
{
|
596 |
|
|
const struct section_to_type *t;
|
597 |
|
|
|
598 |
|
|
for (t = &stt[0]; t->section; t++)
|
599 |
|
|
if (!strncmp (s, t->section, strlen (t->section)))
|
600 |
|
|
return t->type;
|
601 |
|
|
|
602 |
|
|
return '?';
|
603 |
|
|
}
|
604 |
|
|
|
605 |
|
|
/* Return the single-character symbol type corresponding to section
|
606 |
|
|
SECTION, or '?' for an unknown section. This uses section flags to
|
607 |
|
|
identify sections.
|
608 |
|
|
|
609 |
|
|
FIXME These types are unhandled: c, i, e, p. If we handled these also,
|
610 |
|
|
we could perhaps obsolete coff_section_type. */
|
611 |
|
|
|
612 |
|
|
static char
|
613 |
|
|
decode_section_type (const struct bfd_section *section)
|
614 |
|
|
{
|
615 |
|
|
if (section->flags & SEC_CODE)
|
616 |
|
|
return 't';
|
617 |
|
|
if (section->flags & SEC_DATA)
|
618 |
|
|
{
|
619 |
|
|
if (section->flags & SEC_READONLY)
|
620 |
|
|
return 'r';
|
621 |
|
|
else if (section->flags & SEC_SMALL_DATA)
|
622 |
|
|
return 'g';
|
623 |
|
|
else
|
624 |
|
|
return 'd';
|
625 |
|
|
}
|
626 |
|
|
if ((section->flags & SEC_HAS_CONTENTS) == 0)
|
627 |
|
|
{
|
628 |
|
|
if (section->flags & SEC_SMALL_DATA)
|
629 |
|
|
return 's';
|
630 |
|
|
else
|
631 |
|
|
return 'b';
|
632 |
|
|
}
|
633 |
|
|
if (section->flags & SEC_DEBUGGING)
|
634 |
|
|
return 'N';
|
635 |
|
|
if ((section->flags & SEC_HAS_CONTENTS) && (section->flags & SEC_READONLY))
|
636 |
|
|
return 'n';
|
637 |
|
|
|
638 |
|
|
return '?';
|
639 |
|
|
}
|
640 |
|
|
|
641 |
|
|
/*
|
642 |
|
|
FUNCTION
|
643 |
|
|
bfd_decode_symclass
|
644 |
|
|
|
645 |
|
|
DESCRIPTION
|
646 |
|
|
Return a character corresponding to the symbol
|
647 |
|
|
class of @var{symbol}, or '?' for an unknown class.
|
648 |
|
|
|
649 |
|
|
SYNOPSIS
|
650 |
|
|
int bfd_decode_symclass (asymbol *symbol);
|
651 |
|
|
*/
|
652 |
|
|
int
|
653 |
|
|
bfd_decode_symclass (asymbol *symbol)
|
654 |
|
|
{
|
655 |
|
|
char c;
|
656 |
|
|
|
657 |
|
|
if (symbol->section && bfd_is_com_section (symbol->section))
|
658 |
|
|
return 'C';
|
659 |
|
|
if (bfd_is_und_section (symbol->section))
|
660 |
|
|
{
|
661 |
|
|
if (symbol->flags & BSF_WEAK)
|
662 |
|
|
{
|
663 |
|
|
/* If weak, determine if it's specifically an object
|
664 |
|
|
or non-object weak. */
|
665 |
|
|
if (symbol->flags & BSF_OBJECT)
|
666 |
|
|
return 'v';
|
667 |
|
|
else
|
668 |
|
|
return 'w';
|
669 |
|
|
}
|
670 |
|
|
else
|
671 |
|
|
return 'U';
|
672 |
|
|
}
|
673 |
|
|
if (bfd_is_ind_section (symbol->section))
|
674 |
|
|
return 'I';
|
675 |
|
|
if (symbol->flags & BSF_WEAK)
|
676 |
|
|
{
|
677 |
|
|
/* If weak, determine if it's specifically an object
|
678 |
|
|
or non-object weak. */
|
679 |
|
|
if (symbol->flags & BSF_OBJECT)
|
680 |
|
|
return 'V';
|
681 |
|
|
else
|
682 |
|
|
return 'W';
|
683 |
|
|
}
|
684 |
|
|
if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
|
685 |
|
|
return '?';
|
686 |
|
|
|
687 |
|
|
if (bfd_is_abs_section (symbol->section))
|
688 |
|
|
c = 'a';
|
689 |
|
|
else if (symbol->section)
|
690 |
|
|
{
|
691 |
|
|
c = coff_section_type (symbol->section->name);
|
692 |
|
|
if (c == '?')
|
693 |
|
|
c = decode_section_type (symbol->section);
|
694 |
|
|
}
|
695 |
|
|
else
|
696 |
|
|
return '?';
|
697 |
|
|
if (symbol->flags & BSF_GLOBAL)
|
698 |
|
|
c = TOUPPER (c);
|
699 |
|
|
return c;
|
700 |
|
|
|
701 |
|
|
/* We don't have to handle these cases just yet, but we will soon:
|
702 |
|
|
N_SETV: 'v';
|
703 |
|
|
N_SETA: 'l';
|
704 |
|
|
N_SETT: 'x';
|
705 |
|
|
N_SETD: 'z';
|
706 |
|
|
N_SETB: 's';
|
707 |
|
|
N_INDR: 'i';
|
708 |
|
|
*/
|
709 |
|
|
}
|
710 |
|
|
|
711 |
|
|
/*
|
712 |
|
|
FUNCTION
|
713 |
|
|
bfd_is_undefined_symclass
|
714 |
|
|
|
715 |
|
|
DESCRIPTION
|
716 |
|
|
Returns non-zero if the class symbol returned by
|
717 |
|
|
bfd_decode_symclass represents an undefined symbol.
|
718 |
|
|
Returns zero otherwise.
|
719 |
|
|
|
720 |
|
|
SYNOPSIS
|
721 |
|
|
bfd_boolean bfd_is_undefined_symclass (int symclass);
|
722 |
|
|
*/
|
723 |
|
|
|
724 |
|
|
bfd_boolean
|
725 |
|
|
bfd_is_undefined_symclass (int symclass)
|
726 |
|
|
{
|
727 |
|
|
return symclass == 'U' || symclass == 'w' || symclass == 'v';
|
728 |
|
|
}
|
729 |
|
|
|
730 |
|
|
/*
|
731 |
|
|
FUNCTION
|
732 |
|
|
bfd_symbol_info
|
733 |
|
|
|
734 |
|
|
DESCRIPTION
|
735 |
|
|
Fill in the basic info about symbol that nm needs.
|
736 |
|
|
Additional info may be added by the back-ends after
|
737 |
|
|
calling this function.
|
738 |
|
|
|
739 |
|
|
SYNOPSIS
|
740 |
|
|
void bfd_symbol_info (asymbol *symbol, symbol_info *ret);
|
741 |
|
|
*/
|
742 |
|
|
|
743 |
|
|
void
|
744 |
|
|
bfd_symbol_info (asymbol *symbol, symbol_info *ret)
|
745 |
|
|
{
|
746 |
|
|
ret->type = bfd_decode_symclass (symbol);
|
747 |
|
|
|
748 |
|
|
if (bfd_is_undefined_symclass (ret->type))
|
749 |
|
|
ret->value = 0;
|
750 |
|
|
else
|
751 |
|
|
ret->value = symbol->value + symbol->section->vma;
|
752 |
|
|
|
753 |
|
|
ret->name = symbol->name;
|
754 |
|
|
}
|
755 |
|
|
|
756 |
|
|
/*
|
757 |
|
|
FUNCTION
|
758 |
|
|
bfd_copy_private_symbol_data
|
759 |
|
|
|
760 |
|
|
SYNOPSIS
|
761 |
|
|
bfd_boolean bfd_copy_private_symbol_data
|
762 |
|
|
(bfd *ibfd, asymbol *isym, bfd *obfd, asymbol *osym);
|
763 |
|
|
|
764 |
|
|
DESCRIPTION
|
765 |
|
|
Copy private symbol information from @var{isym} in the BFD
|
766 |
|
|
@var{ibfd} to the symbol @var{osym} in the BFD @var{obfd}.
|
767 |
|
|
Return <<TRUE>> on success, <<FALSE>> on error. Possible error
|
768 |
|
|
returns are:
|
769 |
|
|
|
770 |
|
|
o <<bfd_error_no_memory>> -
|
771 |
|
|
Not enough memory exists to create private data for @var{osec}.
|
772 |
|
|
|
773 |
|
|
.#define bfd_copy_private_symbol_data(ibfd, isymbol, obfd, osymbol) \
|
774 |
|
|
. BFD_SEND (obfd, _bfd_copy_private_symbol_data, \
|
775 |
|
|
. (ibfd, isymbol, obfd, osymbol))
|
776 |
|
|
.
|
777 |
|
|
*/
|
778 |
|
|
|
779 |
|
|
/* The generic version of the function which returns mini symbols.
|
780 |
|
|
This is used when the backend does not provide a more efficient
|
781 |
|
|
version. It just uses BFD asymbol structures as mini symbols. */
|
782 |
|
|
|
783 |
|
|
long
|
784 |
|
|
_bfd_generic_read_minisymbols (bfd *abfd,
|
785 |
|
|
bfd_boolean dynamic,
|
786 |
|
|
void **minisymsp,
|
787 |
|
|
unsigned int *sizep)
|
788 |
|
|
{
|
789 |
|
|
long storage;
|
790 |
|
|
asymbol **syms = NULL;
|
791 |
|
|
long symcount;
|
792 |
|
|
|
793 |
|
|
if (dynamic)
|
794 |
|
|
storage = bfd_get_dynamic_symtab_upper_bound (abfd);
|
795 |
|
|
else
|
796 |
|
|
storage = bfd_get_symtab_upper_bound (abfd);
|
797 |
|
|
if (storage < 0)
|
798 |
|
|
goto error_return;
|
799 |
|
|
if (storage == 0)
|
800 |
|
|
return 0;
|
801 |
|
|
|
802 |
|
|
syms = bfd_malloc (storage);
|
803 |
|
|
if (syms == NULL)
|
804 |
|
|
goto error_return;
|
805 |
|
|
|
806 |
|
|
if (dynamic)
|
807 |
|
|
symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
|
808 |
|
|
else
|
809 |
|
|
symcount = bfd_canonicalize_symtab (abfd, syms);
|
810 |
|
|
if (symcount < 0)
|
811 |
|
|
goto error_return;
|
812 |
|
|
|
813 |
|
|
*minisymsp = syms;
|
814 |
|
|
*sizep = sizeof (asymbol *);
|
815 |
|
|
return symcount;
|
816 |
|
|
|
817 |
|
|
error_return:
|
818 |
|
|
bfd_set_error (bfd_error_no_symbols);
|
819 |
|
|
if (syms != NULL)
|
820 |
|
|
free (syms);
|
821 |
|
|
return -1;
|
822 |
|
|
}
|
823 |
|
|
|
824 |
|
|
/* The generic version of the function which converts a minisymbol to
|
825 |
|
|
an asymbol. We don't worry about the sym argument we are passed;
|
826 |
|
|
we just return the asymbol the minisymbol points to. */
|
827 |
|
|
|
828 |
|
|
asymbol *
|
829 |
|
|
_bfd_generic_minisymbol_to_symbol (bfd *abfd ATTRIBUTE_UNUSED,
|
830 |
|
|
bfd_boolean dynamic ATTRIBUTE_UNUSED,
|
831 |
|
|
const void *minisym,
|
832 |
|
|
asymbol *sym ATTRIBUTE_UNUSED)
|
833 |
|
|
{
|
834 |
|
|
return *(asymbol **) minisym;
|
835 |
|
|
}
|
836 |
|
|
|
837 |
|
|
/* Look through stabs debugging information in .stab and .stabstr
|
838 |
|
|
sections to find the source file and line closest to a desired
|
839 |
|
|
location. This is used by COFF and ELF targets. It sets *pfound
|
840 |
|
|
to TRUE if it finds some information. The *pinfo field is used to
|
841 |
|
|
pass cached information in and out of this routine; this first time
|
842 |
|
|
the routine is called for a BFD, *pinfo should be NULL. The value
|
843 |
|
|
placed in *pinfo should be saved with the BFD, and passed back each
|
844 |
|
|
time this function is called. */
|
845 |
|
|
|
846 |
|
|
/* We use a cache by default. */
|
847 |
|
|
|
848 |
|
|
#define ENABLE_CACHING
|
849 |
|
|
|
850 |
|
|
/* We keep an array of indexentry structures to record where in the
|
851 |
|
|
stabs section we should look to find line number information for a
|
852 |
|
|
particular address. */
|
853 |
|
|
|
854 |
|
|
struct indexentry
|
855 |
|
|
{
|
856 |
|
|
bfd_vma val;
|
857 |
|
|
bfd_byte *stab;
|
858 |
|
|
bfd_byte *str;
|
859 |
|
|
char *directory_name;
|
860 |
|
|
char *file_name;
|
861 |
|
|
char *function_name;
|
862 |
|
|
};
|
863 |
|
|
|
864 |
|
|
/* Compare two indexentry structures. This is called via qsort. */
|
865 |
|
|
|
866 |
|
|
static int
|
867 |
|
|
cmpindexentry (const void *a, const void *b)
|
868 |
|
|
{
|
869 |
|
|
const struct indexentry *contestantA = a;
|
870 |
|
|
const struct indexentry *contestantB = b;
|
871 |
|
|
|
872 |
|
|
if (contestantA->val < contestantB->val)
|
873 |
|
|
return -1;
|
874 |
|
|
else if (contestantA->val > contestantB->val)
|
875 |
|
|
return 1;
|
876 |
|
|
else
|
877 |
|
|
return 0;
|
878 |
|
|
}
|
879 |
|
|
|
880 |
|
|
/* A pointer to this structure is stored in *pinfo. */
|
881 |
|
|
|
882 |
|
|
struct stab_find_info
|
883 |
|
|
{
|
884 |
|
|
/* The .stab section. */
|
885 |
|
|
asection *stabsec;
|
886 |
|
|
/* The .stabstr section. */
|
887 |
|
|
asection *strsec;
|
888 |
|
|
/* The contents of the .stab section. */
|
889 |
|
|
bfd_byte *stabs;
|
890 |
|
|
/* The contents of the .stabstr section. */
|
891 |
|
|
bfd_byte *strs;
|
892 |
|
|
|
893 |
|
|
/* A table that indexes stabs by memory address. */
|
894 |
|
|
struct indexentry *indextable;
|
895 |
|
|
/* The number of entries in indextable. */
|
896 |
|
|
int indextablesize;
|
897 |
|
|
|
898 |
|
|
#ifdef ENABLE_CACHING
|
899 |
|
|
/* Cached values to restart quickly. */
|
900 |
|
|
struct indexentry *cached_indexentry;
|
901 |
|
|
bfd_vma cached_offset;
|
902 |
|
|
bfd_byte *cached_stab;
|
903 |
|
|
char *cached_file_name;
|
904 |
|
|
#endif
|
905 |
|
|
|
906 |
|
|
/* Saved ptr to malloc'ed filename. */
|
907 |
|
|
char *filename;
|
908 |
|
|
};
|
909 |
|
|
|
910 |
|
|
bfd_boolean
|
911 |
|
|
_bfd_stab_section_find_nearest_line (bfd *abfd,
|
912 |
|
|
asymbol **symbols,
|
913 |
|
|
asection *section,
|
914 |
|
|
bfd_vma offset,
|
915 |
|
|
bfd_boolean *pfound,
|
916 |
|
|
const char **pfilename,
|
917 |
|
|
const char **pfnname,
|
918 |
|
|
unsigned int *pline,
|
919 |
|
|
void **pinfo)
|
920 |
|
|
{
|
921 |
|
|
struct stab_find_info *info;
|
922 |
|
|
bfd_size_type stabsize, strsize;
|
923 |
|
|
bfd_byte *stab, *str;
|
924 |
|
|
bfd_byte *last_stab = NULL;
|
925 |
|
|
bfd_size_type stroff;
|
926 |
|
|
struct indexentry *indexentry;
|
927 |
|
|
char *file_name;
|
928 |
|
|
char *directory_name;
|
929 |
|
|
int saw_fun;
|
930 |
|
|
bfd_boolean saw_line, saw_func;
|
931 |
|
|
|
932 |
|
|
*pfound = FALSE;
|
933 |
|
|
*pfilename = bfd_get_filename (abfd);
|
934 |
|
|
*pfnname = NULL;
|
935 |
|
|
*pline = 0;
|
936 |
|
|
|
937 |
|
|
/* Stabs entries use a 12 byte format:
|
938 |
|
|
4 byte string table index
|
939 |
|
|
1 byte stab type
|
940 |
|
|
1 byte stab other field
|
941 |
|
|
2 byte stab desc field
|
942 |
|
|
4 byte stab value
|
943 |
|
|
FIXME: This will have to change for a 64 bit object format.
|
944 |
|
|
|
945 |
|
|
The stabs symbols are divided into compilation units. For the
|
946 |
|
|
first entry in each unit, the type of 0, the value is the length
|
947 |
|
|
of the string table for this unit, and the desc field is the
|
948 |
|
|
number of stabs symbols for this unit. */
|
949 |
|
|
|
950 |
|
|
#define STRDXOFF (0)
|
951 |
|
|
#define TYPEOFF (4)
|
952 |
|
|
#define OTHEROFF (5)
|
953 |
|
|
#define DESCOFF (6)
|
954 |
|
|
#define VALOFF (8)
|
955 |
|
|
#define STABSIZE (12)
|
956 |
|
|
|
957 |
|
|
info = *pinfo;
|
958 |
|
|
if (info != NULL)
|
959 |
|
|
{
|
960 |
|
|
if (info->stabsec == NULL || info->strsec == NULL)
|
961 |
|
|
{
|
962 |
|
|
/* No stabs debugging information. */
|
963 |
|
|
return TRUE;
|
964 |
|
|
}
|
965 |
|
|
|
966 |
|
|
stabsize = (info->stabsec->rawsize
|
967 |
|
|
? info->stabsec->rawsize
|
968 |
|
|
: info->stabsec->size);
|
969 |
|
|
strsize = (info->strsec->rawsize
|
970 |
|
|
? info->strsec->rawsize
|
971 |
|
|
: info->strsec->size);
|
972 |
|
|
}
|
973 |
|
|
else
|
974 |
|
|
{
|
975 |
|
|
long reloc_size, reloc_count;
|
976 |
|
|
arelent **reloc_vector;
|
977 |
|
|
int i;
|
978 |
|
|
char *name;
|
979 |
|
|
char *function_name;
|
980 |
|
|
bfd_size_type amt = sizeof *info;
|
981 |
|
|
|
982 |
|
|
info = bfd_zalloc (abfd, amt);
|
983 |
|
|
if (info == NULL)
|
984 |
|
|
return FALSE;
|
985 |
|
|
|
986 |
|
|
/* FIXME: When using the linker --split-by-file or
|
987 |
|
|
--split-by-reloc options, it is possible for the .stab and
|
988 |
|
|
.stabstr sections to be split. We should handle that. */
|
989 |
|
|
|
990 |
|
|
info->stabsec = bfd_get_section_by_name (abfd, ".stab");
|
991 |
|
|
info->strsec = bfd_get_section_by_name (abfd, ".stabstr");
|
992 |
|
|
|
993 |
|
|
if (info->stabsec == NULL || info->strsec == NULL)
|
994 |
|
|
{
|
995 |
|
|
/* Try SOM section names. */
|
996 |
|
|
info->stabsec = bfd_get_section_by_name (abfd, "$GDB_SYMBOLS$");
|
997 |
|
|
info->strsec = bfd_get_section_by_name (abfd, "$GDB_STRINGS$");
|
998 |
|
|
|
999 |
|
|
if (info->stabsec == NULL || info->strsec == NULL)
|
1000 |
|
|
{
|
1001 |
|
|
/* No stabs debugging information. Set *pinfo so that we
|
1002 |
|
|
can return quickly in the info != NULL case above. */
|
1003 |
|
|
*pinfo = info;
|
1004 |
|
|
return TRUE;
|
1005 |
|
|
}
|
1006 |
|
|
}
|
1007 |
|
|
|
1008 |
|
|
stabsize = (info->stabsec->rawsize
|
1009 |
|
|
? info->stabsec->rawsize
|
1010 |
|
|
: info->stabsec->size);
|
1011 |
|
|
strsize = (info->strsec->rawsize
|
1012 |
|
|
? info->strsec->rawsize
|
1013 |
|
|
: info->strsec->size);
|
1014 |
|
|
|
1015 |
|
|
info->stabs = bfd_alloc (abfd, stabsize);
|
1016 |
|
|
info->strs = bfd_alloc (abfd, strsize);
|
1017 |
|
|
if (info->stabs == NULL || info->strs == NULL)
|
1018 |
|
|
return FALSE;
|
1019 |
|
|
|
1020 |
|
|
if (! bfd_get_section_contents (abfd, info->stabsec, info->stabs,
|
1021 |
|
|
0, stabsize)
|
1022 |
|
|
|| ! bfd_get_section_contents (abfd, info->strsec, info->strs,
|
1023 |
|
|
0, strsize))
|
1024 |
|
|
return FALSE;
|
1025 |
|
|
|
1026 |
|
|
/* If this is a relocatable object file, we have to relocate
|
1027 |
|
|
the entries in .stab. This should always be simple 32 bit
|
1028 |
|
|
relocations against symbols defined in this object file, so
|
1029 |
|
|
this should be no big deal. */
|
1030 |
|
|
reloc_size = bfd_get_reloc_upper_bound (abfd, info->stabsec);
|
1031 |
|
|
if (reloc_size < 0)
|
1032 |
|
|
return FALSE;
|
1033 |
|
|
reloc_vector = bfd_malloc (reloc_size);
|
1034 |
|
|
if (reloc_vector == NULL && reloc_size != 0)
|
1035 |
|
|
return FALSE;
|
1036 |
|
|
reloc_count = bfd_canonicalize_reloc (abfd, info->stabsec, reloc_vector,
|
1037 |
|
|
symbols);
|
1038 |
|
|
if (reloc_count < 0)
|
1039 |
|
|
{
|
1040 |
|
|
if (reloc_vector != NULL)
|
1041 |
|
|
free (reloc_vector);
|
1042 |
|
|
return FALSE;
|
1043 |
|
|
}
|
1044 |
|
|
if (reloc_count > 0)
|
1045 |
|
|
{
|
1046 |
|
|
arelent **pr;
|
1047 |
|
|
|
1048 |
|
|
for (pr = reloc_vector; *pr != NULL; pr++)
|
1049 |
|
|
{
|
1050 |
|
|
arelent *r;
|
1051 |
|
|
unsigned long val;
|
1052 |
|
|
asymbol *sym;
|
1053 |
|
|
|
1054 |
|
|
r = *pr;
|
1055 |
|
|
/* Ignore R_*_NONE relocs. */
|
1056 |
|
|
if (r->howto->dst_mask == 0)
|
1057 |
|
|
continue;
|
1058 |
|
|
|
1059 |
|
|
if (r->howto->rightshift != 0
|
1060 |
|
|
|| r->howto->size != 2
|
1061 |
|
|
|| r->howto->bitsize != 32
|
1062 |
|
|
|| r->howto->pc_relative
|
1063 |
|
|
|| r->howto->bitpos != 0
|
1064 |
|
|
|| r->howto->dst_mask != 0xffffffff)
|
1065 |
|
|
{
|
1066 |
|
|
(*_bfd_error_handler)
|
1067 |
|
|
(_("Unsupported .stab relocation"));
|
1068 |
|
|
bfd_set_error (bfd_error_invalid_operation);
|
1069 |
|
|
if (reloc_vector != NULL)
|
1070 |
|
|
free (reloc_vector);
|
1071 |
|
|
return FALSE;
|
1072 |
|
|
}
|
1073 |
|
|
|
1074 |
|
|
val = bfd_get_32 (abfd, info->stabs + r->address);
|
1075 |
|
|
val &= r->howto->src_mask;
|
1076 |
|
|
sym = *r->sym_ptr_ptr;
|
1077 |
|
|
val += sym->value + sym->section->vma + r->addend;
|
1078 |
|
|
bfd_put_32 (abfd, (bfd_vma) val, info->stabs + r->address);
|
1079 |
|
|
}
|
1080 |
|
|
}
|
1081 |
|
|
|
1082 |
|
|
if (reloc_vector != NULL)
|
1083 |
|
|
free (reloc_vector);
|
1084 |
|
|
|
1085 |
|
|
/* First time through this function, build a table matching
|
1086 |
|
|
function VM addresses to stabs, then sort based on starting
|
1087 |
|
|
VM address. Do this in two passes: once to count how many
|
1088 |
|
|
table entries we'll need, and a second to actually build the
|
1089 |
|
|
table. */
|
1090 |
|
|
|
1091 |
|
|
info->indextablesize = 0;
|
1092 |
|
|
saw_fun = 1;
|
1093 |
|
|
for (stab = info->stabs; stab < info->stabs + stabsize; stab += STABSIZE)
|
1094 |
|
|
{
|
1095 |
|
|
if (stab[TYPEOFF] == (bfd_byte) N_SO)
|
1096 |
|
|
{
|
1097 |
|
|
/* N_SO with null name indicates EOF */
|
1098 |
|
|
if (bfd_get_32 (abfd, stab + STRDXOFF) == 0)
|
1099 |
|
|
continue;
|
1100 |
|
|
|
1101 |
|
|
/* if we did not see a function def, leave space for one. */
|
1102 |
|
|
if (saw_fun == 0)
|
1103 |
|
|
++info->indextablesize;
|
1104 |
|
|
|
1105 |
|
|
saw_fun = 0;
|
1106 |
|
|
|
1107 |
|
|
/* two N_SO's in a row is a filename and directory. Skip */
|
1108 |
|
|
if (stab + STABSIZE < info->stabs + stabsize
|
1109 |
|
|
&& *(stab + STABSIZE + TYPEOFF) == (bfd_byte) N_SO)
|
1110 |
|
|
{
|
1111 |
|
|
stab += STABSIZE;
|
1112 |
|
|
}
|
1113 |
|
|
}
|
1114 |
|
|
else if (stab[TYPEOFF] == (bfd_byte) N_FUN)
|
1115 |
|
|
{
|
1116 |
|
|
saw_fun = 1;
|
1117 |
|
|
++info->indextablesize;
|
1118 |
|
|
}
|
1119 |
|
|
}
|
1120 |
|
|
|
1121 |
|
|
if (saw_fun == 0)
|
1122 |
|
|
++info->indextablesize;
|
1123 |
|
|
|
1124 |
|
|
if (info->indextablesize == 0)
|
1125 |
|
|
return TRUE;
|
1126 |
|
|
++info->indextablesize;
|
1127 |
|
|
|
1128 |
|
|
amt = info->indextablesize;
|
1129 |
|
|
amt *= sizeof (struct indexentry);
|
1130 |
|
|
info->indextable = bfd_alloc (abfd, amt);
|
1131 |
|
|
if (info->indextable == NULL)
|
1132 |
|
|
return FALSE;
|
1133 |
|
|
|
1134 |
|
|
file_name = NULL;
|
1135 |
|
|
directory_name = NULL;
|
1136 |
|
|
saw_fun = 1;
|
1137 |
|
|
|
1138 |
|
|
for (i = 0, stroff = 0, stab = info->stabs, str = info->strs;
|
1139 |
|
|
i < info->indextablesize && stab < info->stabs + stabsize;
|
1140 |
|
|
stab += STABSIZE)
|
1141 |
|
|
{
|
1142 |
|
|
switch (stab[TYPEOFF])
|
1143 |
|
|
{
|
1144 |
|
|
case 0:
|
1145 |
|
|
/* This is the first entry in a compilation unit. */
|
1146 |
|
|
if ((bfd_size_type) ((info->strs + strsize) - str) < stroff)
|
1147 |
|
|
break;
|
1148 |
|
|
str += stroff;
|
1149 |
|
|
stroff = bfd_get_32 (abfd, stab + VALOFF);
|
1150 |
|
|
break;
|
1151 |
|
|
|
1152 |
|
|
case N_SO:
|
1153 |
|
|
/* The main file name. */
|
1154 |
|
|
|
1155 |
|
|
/* The following code creates a new indextable entry with
|
1156 |
|
|
a NULL function name if there were no N_FUNs in a file.
|
1157 |
|
|
Note that a N_SO without a file name is an EOF and
|
1158 |
|
|
there could be 2 N_SO following it with the new filename
|
1159 |
|
|
and directory. */
|
1160 |
|
|
if (saw_fun == 0)
|
1161 |
|
|
{
|
1162 |
|
|
info->indextable[i].val = bfd_get_32 (abfd, last_stab + VALOFF);
|
1163 |
|
|
info->indextable[i].stab = last_stab;
|
1164 |
|
|
info->indextable[i].str = str;
|
1165 |
|
|
info->indextable[i].directory_name = directory_name;
|
1166 |
|
|
info->indextable[i].file_name = file_name;
|
1167 |
|
|
info->indextable[i].function_name = NULL;
|
1168 |
|
|
++i;
|
1169 |
|
|
}
|
1170 |
|
|
saw_fun = 0;
|
1171 |
|
|
|
1172 |
|
|
file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
1173 |
|
|
if (*file_name == '\0')
|
1174 |
|
|
{
|
1175 |
|
|
directory_name = NULL;
|
1176 |
|
|
file_name = NULL;
|
1177 |
|
|
saw_fun = 1;
|
1178 |
|
|
}
|
1179 |
|
|
else
|
1180 |
|
|
{
|
1181 |
|
|
last_stab = stab;
|
1182 |
|
|
if (stab + STABSIZE >= info->stabs + stabsize
|
1183 |
|
|
|| *(stab + STABSIZE + TYPEOFF) != (bfd_byte) N_SO)
|
1184 |
|
|
{
|
1185 |
|
|
directory_name = NULL;
|
1186 |
|
|
}
|
1187 |
|
|
else
|
1188 |
|
|
{
|
1189 |
|
|
/* Two consecutive N_SOs are a directory and a
|
1190 |
|
|
file name. */
|
1191 |
|
|
stab += STABSIZE;
|
1192 |
|
|
directory_name = file_name;
|
1193 |
|
|
file_name = ((char *) str
|
1194 |
|
|
+ bfd_get_32 (abfd, stab + STRDXOFF));
|
1195 |
|
|
}
|
1196 |
|
|
}
|
1197 |
|
|
break;
|
1198 |
|
|
|
1199 |
|
|
case N_SOL:
|
1200 |
|
|
/* The name of an include file. */
|
1201 |
|
|
file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
1202 |
|
|
break;
|
1203 |
|
|
|
1204 |
|
|
case N_FUN:
|
1205 |
|
|
/* A function name. */
|
1206 |
|
|
saw_fun = 1;
|
1207 |
|
|
name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
1208 |
|
|
|
1209 |
|
|
if (*name == '\0')
|
1210 |
|
|
name = NULL;
|
1211 |
|
|
|
1212 |
|
|
function_name = name;
|
1213 |
|
|
|
1214 |
|
|
if (name == NULL)
|
1215 |
|
|
continue;
|
1216 |
|
|
|
1217 |
|
|
info->indextable[i].val = bfd_get_32 (abfd, stab + VALOFF);
|
1218 |
|
|
info->indextable[i].stab = stab;
|
1219 |
|
|
info->indextable[i].str = str;
|
1220 |
|
|
info->indextable[i].directory_name = directory_name;
|
1221 |
|
|
info->indextable[i].file_name = file_name;
|
1222 |
|
|
info->indextable[i].function_name = function_name;
|
1223 |
|
|
++i;
|
1224 |
|
|
break;
|
1225 |
|
|
}
|
1226 |
|
|
}
|
1227 |
|
|
|
1228 |
|
|
if (saw_fun == 0)
|
1229 |
|
|
{
|
1230 |
|
|
info->indextable[i].val = bfd_get_32 (abfd, last_stab + VALOFF);
|
1231 |
|
|
info->indextable[i].stab = last_stab;
|
1232 |
|
|
info->indextable[i].str = str;
|
1233 |
|
|
info->indextable[i].directory_name = directory_name;
|
1234 |
|
|
info->indextable[i].file_name = file_name;
|
1235 |
|
|
info->indextable[i].function_name = NULL;
|
1236 |
|
|
++i;
|
1237 |
|
|
}
|
1238 |
|
|
|
1239 |
|
|
info->indextable[i].val = (bfd_vma) -1;
|
1240 |
|
|
info->indextable[i].stab = info->stabs + stabsize;
|
1241 |
|
|
info->indextable[i].str = str;
|
1242 |
|
|
info->indextable[i].directory_name = NULL;
|
1243 |
|
|
info->indextable[i].file_name = NULL;
|
1244 |
|
|
info->indextable[i].function_name = NULL;
|
1245 |
|
|
++i;
|
1246 |
|
|
|
1247 |
|
|
info->indextablesize = i;
|
1248 |
|
|
qsort (info->indextable, (size_t) i, sizeof (struct indexentry),
|
1249 |
|
|
cmpindexentry);
|
1250 |
|
|
|
1251 |
|
|
*pinfo = info;
|
1252 |
|
|
}
|
1253 |
|
|
|
1254 |
|
|
/* We are passed a section relative offset. The offsets in the
|
1255 |
|
|
stabs information are absolute. */
|
1256 |
|
|
offset += bfd_get_section_vma (abfd, section);
|
1257 |
|
|
|
1258 |
|
|
#ifdef ENABLE_CACHING
|
1259 |
|
|
if (info->cached_indexentry != NULL
|
1260 |
|
|
&& offset >= info->cached_offset
|
1261 |
|
|
&& offset < (info->cached_indexentry + 1)->val)
|
1262 |
|
|
{
|
1263 |
|
|
stab = info->cached_stab;
|
1264 |
|
|
indexentry = info->cached_indexentry;
|
1265 |
|
|
file_name = info->cached_file_name;
|
1266 |
|
|
}
|
1267 |
|
|
else
|
1268 |
|
|
#endif
|
1269 |
|
|
{
|
1270 |
|
|
long low, high;
|
1271 |
|
|
long mid = -1;
|
1272 |
|
|
|
1273 |
|
|
/* Cache non-existent or invalid. Do binary search on
|
1274 |
|
|
indextable. */
|
1275 |
|
|
indexentry = NULL;
|
1276 |
|
|
|
1277 |
|
|
low = 0;
|
1278 |
|
|
high = info->indextablesize - 1;
|
1279 |
|
|
while (low != high)
|
1280 |
|
|
{
|
1281 |
|
|
mid = (high + low) / 2;
|
1282 |
|
|
if (offset >= info->indextable[mid].val
|
1283 |
|
|
&& offset < info->indextable[mid + 1].val)
|
1284 |
|
|
{
|
1285 |
|
|
indexentry = &info->indextable[mid];
|
1286 |
|
|
break;
|
1287 |
|
|
}
|
1288 |
|
|
|
1289 |
|
|
if (info->indextable[mid].val > offset)
|
1290 |
|
|
high = mid;
|
1291 |
|
|
else
|
1292 |
|
|
low = mid + 1;
|
1293 |
|
|
}
|
1294 |
|
|
|
1295 |
|
|
if (indexentry == NULL)
|
1296 |
|
|
return TRUE;
|
1297 |
|
|
|
1298 |
|
|
stab = indexentry->stab + STABSIZE;
|
1299 |
|
|
file_name = indexentry->file_name;
|
1300 |
|
|
}
|
1301 |
|
|
|
1302 |
|
|
directory_name = indexentry->directory_name;
|
1303 |
|
|
str = indexentry->str;
|
1304 |
|
|
|
1305 |
|
|
saw_line = FALSE;
|
1306 |
|
|
saw_func = FALSE;
|
1307 |
|
|
for (; stab < (indexentry+1)->stab; stab += STABSIZE)
|
1308 |
|
|
{
|
1309 |
|
|
bfd_boolean done;
|
1310 |
|
|
bfd_vma val;
|
1311 |
|
|
|
1312 |
|
|
done = FALSE;
|
1313 |
|
|
|
1314 |
|
|
switch (stab[TYPEOFF])
|
1315 |
|
|
{
|
1316 |
|
|
case N_SOL:
|
1317 |
|
|
/* The name of an include file. */
|
1318 |
|
|
val = bfd_get_32 (abfd, stab + VALOFF);
|
1319 |
|
|
if (val <= offset)
|
1320 |
|
|
{
|
1321 |
|
|
file_name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
1322 |
|
|
*pline = 0;
|
1323 |
|
|
}
|
1324 |
|
|
break;
|
1325 |
|
|
|
1326 |
|
|
case N_SLINE:
|
1327 |
|
|
case N_DSLINE:
|
1328 |
|
|
case N_BSLINE:
|
1329 |
|
|
/* A line number. If the function was specified, then the value
|
1330 |
|
|
is relative to the start of the function. Otherwise, the
|
1331 |
|
|
value is an absolute address. */
|
1332 |
|
|
val = ((indexentry->function_name ? indexentry->val : 0)
|
1333 |
|
|
+ bfd_get_32 (abfd, stab + VALOFF));
|
1334 |
|
|
/* If this line starts before our desired offset, or if it's
|
1335 |
|
|
the first line we've been able to find, use it. The
|
1336 |
|
|
!saw_line check works around a bug in GCC 2.95.3, which emits
|
1337 |
|
|
the first N_SLINE late. */
|
1338 |
|
|
if (!saw_line || val <= offset)
|
1339 |
|
|
{
|
1340 |
|
|
*pline = bfd_get_16 (abfd, stab + DESCOFF);
|
1341 |
|
|
|
1342 |
|
|
#ifdef ENABLE_CACHING
|
1343 |
|
|
info->cached_stab = stab;
|
1344 |
|
|
info->cached_offset = val;
|
1345 |
|
|
info->cached_file_name = file_name;
|
1346 |
|
|
info->cached_indexentry = indexentry;
|
1347 |
|
|
#endif
|
1348 |
|
|
}
|
1349 |
|
|
if (val > offset)
|
1350 |
|
|
done = TRUE;
|
1351 |
|
|
saw_line = TRUE;
|
1352 |
|
|
break;
|
1353 |
|
|
|
1354 |
|
|
case N_FUN:
|
1355 |
|
|
case N_SO:
|
1356 |
|
|
if (saw_func || saw_line)
|
1357 |
|
|
done = TRUE;
|
1358 |
|
|
saw_func = TRUE;
|
1359 |
|
|
break;
|
1360 |
|
|
}
|
1361 |
|
|
|
1362 |
|
|
if (done)
|
1363 |
|
|
break;
|
1364 |
|
|
}
|
1365 |
|
|
|
1366 |
|
|
*pfound = TRUE;
|
1367 |
|
|
|
1368 |
|
|
if (file_name == NULL || IS_ABSOLUTE_PATH (file_name)
|
1369 |
|
|
|| directory_name == NULL)
|
1370 |
|
|
*pfilename = file_name;
|
1371 |
|
|
else
|
1372 |
|
|
{
|
1373 |
|
|
size_t dirlen;
|
1374 |
|
|
|
1375 |
|
|
dirlen = strlen (directory_name);
|
1376 |
|
|
if (info->filename == NULL
|
1377 |
|
|
|| strncmp (info->filename, directory_name, dirlen) != 0
|
1378 |
|
|
|| strcmp (info->filename + dirlen, file_name) != 0)
|
1379 |
|
|
{
|
1380 |
|
|
size_t len;
|
1381 |
|
|
|
1382 |
|
|
if (info->filename != NULL)
|
1383 |
|
|
free (info->filename);
|
1384 |
|
|
len = strlen (file_name) + 1;
|
1385 |
|
|
info->filename = bfd_malloc (dirlen + len);
|
1386 |
|
|
if (info->filename == NULL)
|
1387 |
|
|
return FALSE;
|
1388 |
|
|
memcpy (info->filename, directory_name, dirlen);
|
1389 |
|
|
memcpy (info->filename + dirlen, file_name, len);
|
1390 |
|
|
}
|
1391 |
|
|
|
1392 |
|
|
*pfilename = info->filename;
|
1393 |
|
|
}
|
1394 |
|
|
|
1395 |
|
|
if (indexentry->function_name != NULL)
|
1396 |
|
|
{
|
1397 |
|
|
char *s;
|
1398 |
|
|
|
1399 |
|
|
/* This will typically be something like main:F(0,1), so we want
|
1400 |
|
|
to clobber the colon. It's OK to change the name, since the
|
1401 |
|
|
string is in our own local storage anyhow. */
|
1402 |
|
|
s = strchr (indexentry->function_name, ':');
|
1403 |
|
|
if (s != NULL)
|
1404 |
|
|
*s = '\0';
|
1405 |
|
|
|
1406 |
|
|
*pfnname = indexentry->function_name;
|
1407 |
|
|
}
|
1408 |
|
|
|
1409 |
|
|
return TRUE;
|
1410 |
|
|
}
|