Commit | Line | Data |
---|---|---|
4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
29 | #include <getopt.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <stdarg.h> | |
33 | #include <ctype.h> | |
cd932c59 | 34 | #include <dwarf-regs.h> |
074fc0e4 | 35 | |
89c69c0e MH |
36 | #include "event.h" |
37 | #include "debug.h" | |
074fc0e4 | 38 | #include "util.h" |
9ed7e1b8 | 39 | #include "symbol.h" |
4ea42b18 MH |
40 | #include "probe-finder.h" |
41 | ||
4984912e MH |
42 | /* Kprobe tracer basic type is up to u64 */ |
43 | #define MAX_BASIC_TYPE_BITS 64 | |
44 | ||
4ea42b18 MH |
45 | /* |
46 | * Compare the tail of two strings. | |
47 | * Return 0 if whole of either string is same as another's tail part. | |
48 | */ | |
49 | static int strtailcmp(const char *s1, const char *s2) | |
50 | { | |
51 | int i1 = strlen(s1); | |
52 | int i2 = strlen(s2); | |
d56728b8 | 53 | while (--i1 >= 0 && --i2 >= 0) { |
4ea42b18 MH |
54 | if (s1[i1] != s2[i2]) |
55 | return s1[i1] - s2[i2]; | |
56 | } | |
57 | return 0; | |
58 | } | |
59 | ||
2a9c8c36 MH |
60 | /* Line number list operations */ |
61 | ||
62 | /* Add a line to line number list */ | |
d3b63d7a | 63 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
64 | { |
65 | struct line_node *ln; | |
66 | struct list_head *p; | |
67 | ||
68 | /* Reverse search, because new line will be the last one */ | |
69 | list_for_each_entry_reverse(ln, head, list) { | |
70 | if (ln->line < line) { | |
71 | p = &ln->list; | |
72 | goto found; | |
73 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 74 | return 1; |
2a9c8c36 MH |
75 | } |
76 | /* List is empty, or the smallest entry */ | |
77 | p = head; | |
78 | found: | |
79 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
80 | ln = zalloc(sizeof(struct line_node)); |
81 | if (ln == NULL) | |
82 | return -ENOMEM; | |
2a9c8c36 MH |
83 | ln->line = line; |
84 | INIT_LIST_HEAD(&ln->list); | |
85 | list_add(&ln->list, p); | |
e334016f | 86 | return 0; |
2a9c8c36 MH |
87 | } |
88 | ||
89 | /* Check if the line in line number list */ | |
d3b63d7a | 90 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
91 | { |
92 | struct line_node *ln; | |
93 | ||
94 | /* Reverse search, because new line will be the last one */ | |
95 | list_for_each_entry(ln, head, list) | |
96 | if (ln->line == line) | |
97 | return 1; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | /* Init line number list */ | |
103 | static void line_list__init(struct list_head *head) | |
104 | { | |
105 | INIT_LIST_HEAD(head); | |
106 | } | |
107 | ||
108 | /* Free line number list */ | |
109 | static void line_list__free(struct list_head *head) | |
110 | { | |
111 | struct line_node *ln; | |
112 | while (!list_empty(head)) { | |
113 | ln = list_first_entry(head, struct line_node, list); | |
114 | list_del(&ln->list); | |
115 | free(ln); | |
116 | } | |
117 | } | |
118 | ||
119 | /* Dwarf wrappers */ | |
120 | ||
121 | /* Find the realpath of the target file. */ | |
122 | static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) | |
4ea42b18 | 123 | { |
804b3606 MH |
124 | Dwarf_Files *files; |
125 | size_t nfiles, i; | |
accd3cc4 | 126 | const char *src = NULL; |
4ea42b18 MH |
127 | int ret; |
128 | ||
129 | if (!fname) | |
2a9c8c36 | 130 | return NULL; |
4ea42b18 | 131 | |
804b3606 | 132 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
2a9c8c36 MH |
133 | if (ret != 0) |
134 | return NULL; | |
135 | ||
136 | for (i = 0; i < nfiles; i++) { | |
137 | src = dwarf_filesrc(files, i, NULL, NULL); | |
138 | if (strtailcmp(src, fname) == 0) | |
139 | break; | |
4ea42b18 | 140 | } |
c9e38582 MH |
141 | if (i == nfiles) |
142 | return NULL; | |
2a9c8c36 | 143 | return src; |
4ea42b18 MH |
144 | } |
145 | ||
6a330a3c MH |
146 | /* Get DW_AT_comp_dir (should be NULL with older gcc) */ |
147 | static const char *cu_get_comp_dir(Dwarf_Die *cu_die) | |
148 | { | |
149 | Dwarf_Attribute attr; | |
150 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) | |
151 | return NULL; | |
152 | return dwarf_formstring(&attr); | |
153 | } | |
154 | ||
016f262e MH |
155 | /* Compare diename and tname */ |
156 | static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) | |
157 | { | |
158 | const char *name; | |
159 | name = dwarf_diename(dw_die); | |
82175633 | 160 | return name ? (strcmp(tname, name) == 0) : false; |
016f262e MH |
161 | } |
162 | ||
4046b8bb MH |
163 | /* Get type die */ |
164 | static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
165 | { | |
166 | Dwarf_Attribute attr; | |
167 | ||
168 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && | |
169 | dwarf_formref_die(&attr, die_mem)) | |
170 | return die_mem; | |
171 | else | |
172 | return NULL; | |
173 | } | |
174 | ||
7df2f329 MH |
175 | /* Get type die, but skip qualifiers and typedef */ |
176 | static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
177 | { | |
7df2f329 MH |
178 | int tag; |
179 | ||
180 | do { | |
4046b8bb MH |
181 | vr_die = die_get_type(vr_die, die_mem); |
182 | if (!vr_die) | |
183 | break; | |
184 | tag = dwarf_tag(vr_die); | |
7df2f329 MH |
185 | } while (tag == DW_TAG_const_type || |
186 | tag == DW_TAG_restrict_type || | |
187 | tag == DW_TAG_volatile_type || | |
188 | tag == DW_TAG_shared_type || | |
189 | tag == DW_TAG_typedef); | |
190 | ||
4046b8bb | 191 | return vr_die; |
7df2f329 MH |
192 | } |
193 | ||
4984912e MH |
194 | static bool die_is_signed_type(Dwarf_Die *tp_die) |
195 | { | |
196 | Dwarf_Attribute attr; | |
197 | Dwarf_Word ret; | |
198 | ||
199 | if (dwarf_attr(tp_die, DW_AT_encoding, &attr) == NULL || | |
200 | dwarf_formudata(&attr, &ret) != 0) | |
201 | return false; | |
202 | ||
203 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
204 | ret == DW_ATE_signed_fixed); | |
205 | } | |
206 | ||
207 | static int die_get_byte_size(Dwarf_Die *tp_die) | |
208 | { | |
209 | Dwarf_Attribute attr; | |
210 | Dwarf_Word ret; | |
211 | ||
212 | if (dwarf_attr(tp_die, DW_AT_byte_size, &attr) == NULL || | |
213 | dwarf_formudata(&attr, &ret) != 0) | |
214 | return 0; | |
215 | ||
216 | return (int)ret; | |
217 | } | |
218 | ||
de1439d8 MH |
219 | /* Get data_member_location offset */ |
220 | static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
221 | { | |
222 | Dwarf_Attribute attr; | |
223 | Dwarf_Op *expr; | |
224 | size_t nexpr; | |
225 | int ret; | |
226 | ||
227 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
228 | return -ENOENT; | |
229 | ||
230 | if (dwarf_formudata(&attr, offs) != 0) { | |
231 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
232 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
233 | if (ret < 0 || nexpr == 0) | |
234 | return -ENOENT; | |
235 | ||
236 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
237 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
238 | expr[0].atom, nexpr); | |
239 | return -ENOTSUP; | |
240 | } | |
241 | *offs = (Dwarf_Word)expr[0].number; | |
242 | } | |
243 | return 0; | |
244 | } | |
245 | ||
016f262e MH |
246 | /* Return values for die_find callbacks */ |
247 | enum { | |
248 | DIE_FIND_CB_FOUND = 0, /* End of Search */ | |
249 | DIE_FIND_CB_CHILD = 1, /* Search only children */ | |
250 | DIE_FIND_CB_SIBLING = 2, /* Search only siblings */ | |
251 | DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */ | |
252 | }; | |
253 | ||
254 | /* Search a child die */ | |
255 | static Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
256 | int (*callback)(Dwarf_Die *, void *), | |
257 | void *data, Dwarf_Die *die_mem) | |
258 | { | |
259 | Dwarf_Die child_die; | |
260 | int ret; | |
261 | ||
262 | ret = dwarf_child(rt_die, die_mem); | |
263 | if (ret != 0) | |
264 | return NULL; | |
265 | ||
266 | do { | |
267 | ret = callback(die_mem, data); | |
268 | if (ret == DIE_FIND_CB_FOUND) | |
269 | return die_mem; | |
270 | ||
271 | if ((ret & DIE_FIND_CB_CHILD) && | |
272 | die_find_child(die_mem, callback, data, &child_die)) { | |
273 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
274 | return die_mem; | |
275 | } | |
276 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
277 | dwarf_siblingof(die_mem, die_mem) == 0); | |
278 | ||
279 | return NULL; | |
280 | } | |
281 | ||
804b3606 MH |
282 | struct __addr_die_search_param { |
283 | Dwarf_Addr addr; | |
284 | Dwarf_Die *die_mem; | |
285 | }; | |
286 | ||
287 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
631c9def | 288 | { |
804b3606 | 289 | struct __addr_die_search_param *ad = data; |
631c9def | 290 | |
804b3606 MH |
291 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
292 | dwarf_haspc(fn_die, ad->addr)) { | |
293 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
294 | return DWARF_CB_ABORT; | |
295 | } | |
296 | return DWARF_CB_OK; | |
297 | } | |
631c9def | 298 | |
804b3606 | 299 | /* Search a real subprogram including this line, */ |
95a3e4c4 MH |
300 | static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
301 | Dwarf_Die *die_mem) | |
804b3606 MH |
302 | { |
303 | struct __addr_die_search_param ad; | |
304 | ad.addr = addr; | |
305 | ad.die_mem = die_mem; | |
306 | /* dwarf_getscopes can't find subprogram. */ | |
307 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
308 | return NULL; | |
309 | else | |
310 | return die_mem; | |
631c9def MH |
311 | } |
312 | ||
016f262e MH |
313 | /* die_find callback for inline function search */ |
314 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
161a26b0 | 315 | { |
016f262e | 316 | Dwarf_Addr *addr = data; |
161a26b0 | 317 | |
016f262e MH |
318 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
319 | dwarf_haspc(die_mem, *addr)) | |
320 | return DIE_FIND_CB_FOUND; | |
161a26b0 | 321 | |
016f262e | 322 | return DIE_FIND_CB_CONTINUE; |
161a26b0 MH |
323 | } |
324 | ||
016f262e MH |
325 | /* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ |
326 | static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
327 | Dwarf_Die *die_mem) | |
4ea42b18 | 328 | { |
016f262e | 329 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); |
4ea42b18 MH |
330 | } |
331 | ||
378eeaad MH |
332 | struct __find_variable_param { |
333 | const char *name; | |
334 | Dwarf_Addr addr; | |
335 | }; | |
336 | ||
016f262e | 337 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
4ea42b18 | 338 | { |
378eeaad | 339 | struct __find_variable_param *fvp = data; |
016f262e | 340 | int tag; |
4ea42b18 | 341 | |
016f262e MH |
342 | tag = dwarf_tag(die_mem); |
343 | if ((tag == DW_TAG_formal_parameter || | |
344 | tag == DW_TAG_variable) && | |
378eeaad | 345 | die_compare_name(die_mem, fvp->name)) |
016f262e MH |
346 | return DIE_FIND_CB_FOUND; |
347 | ||
378eeaad MH |
348 | if (dwarf_haspc(die_mem, fvp->addr)) |
349 | return DIE_FIND_CB_CONTINUE; | |
350 | else | |
351 | return DIE_FIND_CB_SIBLING; | |
4ea42b18 MH |
352 | } |
353 | ||
378eeaad MH |
354 | /* Find a variable called 'name' at given address */ |
355 | static Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, | |
356 | Dwarf_Addr addr, Dwarf_Die *die_mem) | |
4ea42b18 | 357 | { |
378eeaad MH |
358 | struct __find_variable_param fvp = { .name = name, .addr = addr}; |
359 | ||
360 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, | |
016f262e | 361 | die_mem); |
4ea42b18 MH |
362 | } |
363 | ||
7df2f329 MH |
364 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
365 | { | |
366 | const char *name = data; | |
367 | ||
368 | if ((dwarf_tag(die_mem) == DW_TAG_member) && | |
82175633 | 369 | die_compare_name(die_mem, name)) |
7df2f329 MH |
370 | return DIE_FIND_CB_FOUND; |
371 | ||
372 | return DIE_FIND_CB_SIBLING; | |
373 | } | |
374 | ||
375 | /* Find a member called 'name' */ | |
376 | static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
377 | Dwarf_Die *die_mem) | |
378 | { | |
379 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
380 | die_mem); | |
381 | } | |
382 | ||
4ea42b18 MH |
383 | /* |
384 | * Probe finder related functions | |
385 | */ | |
386 | ||
0e60836b | 387 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 388 | { |
0e60836b SD |
389 | struct probe_trace_arg_ref *ref; |
390 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
391 | if (ref != NULL) |
392 | ref->offset = offs; | |
393 | return ref; | |
394 | } | |
395 | ||
4ea42b18 | 396 | /* Show a location */ |
b7dcb857 | 397 | static int convert_variable_location(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 398 | { |
b7dcb857 MH |
399 | Dwarf_Attribute attr; |
400 | Dwarf_Op *op; | |
401 | size_t nops; | |
804b3606 MH |
402 | unsigned int regn; |
403 | Dwarf_Word offs = 0; | |
4235b045 | 404 | bool ref = false; |
4ea42b18 | 405 | const char *regs; |
0e60836b | 406 | struct probe_trace_arg *tvar = pf->tvar; |
b7dcb857 MH |
407 | int ret; |
408 | ||
409 | /* TODO: handle more than 1 exprs */ | |
410 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
411 | dwarf_getlocation_addr(&attr, pf->addr, &op, &nops, 1) <= 0 || | |
412 | nops == 0) { | |
413 | /* TODO: Support const_value */ | |
414 | pr_err("Failed to find the location of %s at this address.\n" | |
415 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
416 | return -ENOENT; | |
417 | } | |
418 | ||
419 | if (op->atom == DW_OP_addr) { | |
420 | /* Static variables on memory (not stack), make @varname */ | |
421 | ret = strlen(dwarf_diename(vr_die)); | |
422 | tvar->value = zalloc(ret + 2); | |
423 | if (tvar->value == NULL) | |
424 | return -ENOMEM; | |
425 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
426 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
427 | if (tvar->ref == NULL) | |
428 | return -ENOMEM; | |
429 | return 0; | |
430 | } | |
4ea42b18 | 431 | |
4ea42b18 | 432 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 433 | if (op->atom == DW_OP_fbreg) { |
b55a87ad MH |
434 | if (pf->fb_ops == NULL) { |
435 | pr_warning("The attribute of frame base is not " | |
436 | "supported.\n"); | |
437 | return -ENOTSUP; | |
438 | } | |
4235b045 | 439 | ref = true; |
804b3606 MH |
440 | offs = op->number; |
441 | op = &pf->fb_ops[0]; | |
442 | } | |
4ea42b18 | 443 | |
804b3606 MH |
444 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
445 | regn = op->atom - DW_OP_breg0; | |
446 | offs += op->number; | |
4235b045 | 447 | ref = true; |
804b3606 MH |
448 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
449 | regn = op->atom - DW_OP_reg0; | |
450 | } else if (op->atom == DW_OP_bregx) { | |
451 | regn = op->number; | |
452 | offs += op->number2; | |
4235b045 | 453 | ref = true; |
804b3606 MH |
454 | } else if (op->atom == DW_OP_regx) { |
455 | regn = op->number; | |
b55a87ad MH |
456 | } else { |
457 | pr_warning("DW_OP %x is not supported.\n", op->atom); | |
458 | return -ENOTSUP; | |
459 | } | |
4ea42b18 MH |
460 | |
461 | regs = get_arch_regstr(regn); | |
b55a87ad | 462 | if (!regs) { |
cd932c59 | 463 | pr_warning("Mapping for DWARF register number %u missing on this architecture.", regn); |
b55a87ad MH |
464 | return -ERANGE; |
465 | } | |
4ea42b18 | 466 | |
02b95dad MH |
467 | tvar->value = strdup(regs); |
468 | if (tvar->value == NULL) | |
469 | return -ENOMEM; | |
470 | ||
4235b045 | 471 | if (ref) { |
b7dcb857 | 472 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
473 | if (tvar->ref == NULL) |
474 | return -ENOMEM; | |
4235b045 | 475 | } |
b55a87ad | 476 | return 0; |
4ea42b18 MH |
477 | } |
478 | ||
b55a87ad | 479 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 480 | struct probe_trace_arg *tvar, |
73317b95 | 481 | const char *cast) |
4984912e | 482 | { |
0e60836b | 483 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
484 | Dwarf_Die type; |
485 | char buf[16]; | |
486 | int ret; | |
487 | ||
73317b95 MH |
488 | /* TODO: check all types */ |
489 | if (cast && strcmp(cast, "string") != 0) { | |
490 | /* Non string type is OK */ | |
491 | tvar->type = strdup(cast); | |
492 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
493 | } | |
494 | ||
b55a87ad MH |
495 | if (die_get_real_type(vr_die, &type) == NULL) { |
496 | pr_warning("Failed to get a type information of %s.\n", | |
497 | dwarf_diename(vr_die)); | |
498 | return -ENOENT; | |
499 | } | |
4984912e | 500 | |
b2a3c12b MH |
501 | pr_debug("%s type is %s.\n", |
502 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
503 | ||
73317b95 MH |
504 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
505 | ret = dwarf_tag(&type); | |
506 | if (ret != DW_TAG_pointer_type && | |
507 | ret != DW_TAG_array_type) { | |
508 | pr_warning("Failed to cast into string: " | |
509 | "%s(%s) is not a pointer nor array.", | |
510 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
511 | return -EINVAL; | |
512 | } | |
513 | if (ret == DW_TAG_pointer_type) { | |
514 | if (die_get_real_type(&type, &type) == NULL) { | |
515 | pr_warning("Failed to get a type information."); | |
516 | return -ENOENT; | |
517 | } | |
518 | while (*ref_ptr) | |
519 | ref_ptr = &(*ref_ptr)->next; | |
520 | /* Add new reference with offset +0 */ | |
0e60836b | 521 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
522 | if (*ref_ptr == NULL) { |
523 | pr_warning("Out of memory error\n"); | |
524 | return -ENOMEM; | |
525 | } | |
526 | } | |
82175633 MH |
527 | if (!die_compare_name(&type, "char") && |
528 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 MH |
529 | pr_warning("Failed to cast into string: " |
530 | "%s is not (unsigned) char *.", | |
531 | dwarf_diename(vr_die)); | |
532 | return -EINVAL; | |
533 | } | |
534 | tvar->type = strdup(cast); | |
535 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
536 | } | |
537 | ||
4984912e MH |
538 | ret = die_get_byte_size(&type) * 8; |
539 | if (ret) { | |
540 | /* Check the bitwidth */ | |
541 | if (ret > MAX_BASIC_TYPE_BITS) { | |
b55a87ad MH |
542 | pr_info("%s exceeds max-bitwidth." |
543 | " Cut down to %d bits.\n", | |
544 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
4984912e MH |
545 | ret = MAX_BASIC_TYPE_BITS; |
546 | } | |
547 | ||
548 | ret = snprintf(buf, 16, "%c%d", | |
549 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
b55a87ad MH |
550 | if (ret < 0 || ret >= 16) { |
551 | if (ret >= 16) | |
552 | ret = -E2BIG; | |
553 | pr_warning("Failed to convert variable type: %s\n", | |
554 | strerror(-ret)); | |
555 | return ret; | |
556 | } | |
73317b95 MH |
557 | tvar->type = strdup(buf); |
558 | if (tvar->type == NULL) | |
02b95dad | 559 | return -ENOMEM; |
4984912e | 560 | } |
b55a87ad | 561 | return 0; |
4984912e MH |
562 | } |
563 | ||
b55a87ad | 564 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 565 | struct perf_probe_arg_field *field, |
0e60836b | 566 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 567 | Dwarf_Die *die_mem) |
7df2f329 | 568 | { |
0e60836b | 569 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
570 | Dwarf_Die type; |
571 | Dwarf_Word offs; | |
b2a3c12b | 572 | int ret, tag; |
7df2f329 MH |
573 | |
574 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
575 | if (die_get_real_type(vr_die, &type) == NULL) { |
576 | pr_warning("Failed to get the type of %s.\n", varname); | |
577 | return -ENOENT; | |
578 | } | |
b2a3c12b MH |
579 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
580 | tag = dwarf_tag(&type); | |
581 | ||
582 | if (field->name[0] == '[' && | |
583 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
584 | if (field->next) | |
585 | /* Save original type for next field */ | |
586 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
587 | /* Get the type of this array */ | |
588 | if (die_get_real_type(&type, &type) == NULL) { | |
589 | pr_warning("Failed to get the type of %s.\n", varname); | |
590 | return -ENOENT; | |
591 | } | |
592 | pr_debug2("Array real type: (%x)\n", | |
593 | (unsigned)dwarf_dieoffset(&type)); | |
594 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 595 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
596 | if (ref == NULL) |
597 | return -ENOMEM; | |
598 | if (*ref_ptr) | |
599 | (*ref_ptr)->next = ref; | |
600 | else | |
601 | *ref_ptr = ref; | |
602 | } | |
603 | ref->offset += die_get_byte_size(&type) * field->index; | |
604 | if (!field->next) | |
605 | /* Save vr_die for converting types */ | |
606 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
607 | goto next; | |
608 | } else if (tag == DW_TAG_pointer_type) { | |
609 | /* Check the pointer and dereference */ | |
b55a87ad MH |
610 | if (!field->ref) { |
611 | pr_err("Semantic error: %s must be referred by '->'\n", | |
612 | field->name); | |
613 | return -EINVAL; | |
614 | } | |
7df2f329 | 615 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
616 | if (die_get_real_type(&type, &type) == NULL) { |
617 | pr_warning("Failed to get the type of %s.\n", varname); | |
618 | return -ENOENT; | |
619 | } | |
12e5a7ae | 620 | /* Verify it is a data structure */ |
b55a87ad MH |
621 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
622 | pr_warning("%s is not a data structure.\n", varname); | |
623 | return -EINVAL; | |
624 | } | |
12e5a7ae | 625 | |
0e60836b | 626 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
627 | if (ref == NULL) |
628 | return -ENOMEM; | |
7df2f329 MH |
629 | if (*ref_ptr) |
630 | (*ref_ptr)->next = ref; | |
631 | else | |
632 | *ref_ptr = ref; | |
633 | } else { | |
12e5a7ae | 634 | /* Verify it is a data structure */ |
b2a3c12b | 635 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
636 | pr_warning("%s is not a data structure.\n", varname); |
637 | return -EINVAL; | |
638 | } | |
b2a3c12b MH |
639 | if (field->name[0] == '[') { |
640 | pr_err("Semantic error: %s is not a pointor nor array.", | |
641 | varname); | |
642 | return -EINVAL; | |
643 | } | |
b55a87ad MH |
644 | if (field->ref) { |
645 | pr_err("Semantic error: %s must be referred by '.'\n", | |
646 | field->name); | |
647 | return -EINVAL; | |
648 | } | |
649 | if (!ref) { | |
650 | pr_warning("Structure on a register is not " | |
651 | "supported yet.\n"); | |
652 | return -ENOTSUP; | |
653 | } | |
7df2f329 MH |
654 | } |
655 | ||
b55a87ad MH |
656 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
657 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
658 | dwarf_diename(&type), field->name); | |
659 | return -EINVAL; | |
660 | } | |
7df2f329 MH |
661 | |
662 | /* Get the offset of the field */ | |
de1439d8 MH |
663 | ret = die_get_data_member_location(die_mem, &offs); |
664 | if (ret < 0) { | |
b55a87ad | 665 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 666 | return ret; |
b55a87ad | 667 | } |
7df2f329 MH |
668 | ref->offset += (long)offs; |
669 | ||
b2a3c12b | 670 | next: |
7df2f329 MH |
671 | /* Converting next field */ |
672 | if (field->next) | |
b55a87ad | 673 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 674 | field->next, &ref, die_mem); |
b55a87ad MH |
675 | else |
676 | return 0; | |
7df2f329 MH |
677 | } |
678 | ||
4ea42b18 | 679 | /* Show a variables in kprobe event format */ |
b55a87ad | 680 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 681 | { |
4984912e | 682 | Dwarf_Die die_mem; |
4ea42b18 MH |
683 | int ret; |
684 | ||
b7dcb857 MH |
685 | pr_debug("Converting variable %s into trace event.\n", |
686 | dwarf_diename(vr_die)); | |
804b3606 | 687 | |
b7dcb857 | 688 | ret = convert_variable_location(vr_die, pf); |
b55a87ad MH |
689 | if (ret == 0 && pf->pvar->field) { |
690 | ret = convert_variable_fields(vr_die, pf->pvar->var, | |
691 | pf->pvar->field, &pf->tvar->ref, | |
692 | &die_mem); | |
4984912e MH |
693 | vr_die = &die_mem; |
694 | } | |
73317b95 MH |
695 | if (ret == 0) |
696 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 697 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 698 | return ret; |
4ea42b18 MH |
699 | } |
700 | ||
4ea42b18 | 701 | /* Find a variable in a subprogram die */ |
b55a87ad | 702 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 703 | { |
b7dcb857 | 704 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 705 | char buf[32], *ptr; |
b7dcb857 | 706 | int ret, nscopes; |
4ea42b18 | 707 | |
367e94c1 MH |
708 | if (!is_c_varname(pf->pvar->var)) { |
709 | /* Copy raw parameters */ | |
710 | pf->tvar->value = strdup(pf->pvar->var); | |
711 | if (pf->tvar->value == NULL) | |
712 | return -ENOMEM; | |
713 | if (pf->pvar->type) { | |
714 | pf->tvar->type = strdup(pf->pvar->type); | |
715 | if (pf->tvar->type == NULL) | |
716 | return -ENOMEM; | |
717 | } | |
718 | if (pf->pvar->name) { | |
719 | pf->tvar->name = strdup(pf->pvar->name); | |
720 | if (pf->tvar->name == NULL) | |
721 | return -ENOMEM; | |
722 | } else | |
723 | pf->tvar->name = NULL; | |
724 | return 0; | |
725 | } | |
726 | ||
48481938 | 727 | if (pf->pvar->name) |
02b95dad | 728 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 729 | else { |
02b95dad MH |
730 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
731 | if (ret < 0) | |
732 | return ret; | |
11a1ca35 MH |
733 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
734 | if (ptr) | |
735 | *ptr = '_'; | |
02b95dad | 736 | pf->tvar->name = strdup(buf); |
48481938 | 737 | } |
02b95dad MH |
738 | if (pf->tvar->name == NULL) |
739 | return -ENOMEM; | |
48481938 | 740 | |
b55a87ad MH |
741 | pr_debug("Searching '%s' variable in context.\n", |
742 | pf->pvar->var); | |
743 | /* Search child die for local variables and parameters. */ | |
378eeaad | 744 | if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
745 | ret = convert_variable(&vr_die, pf); |
746 | else { | |
747 | /* Search upper class */ | |
748 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
749 | if (nscopes > 0) { | |
750 | ret = dwarf_getscopevar(scopes, nscopes, pf->pvar->var, | |
751 | 0, NULL, 0, 0, &vr_die); | |
752 | if (ret >= 0) | |
753 | ret = convert_variable(&vr_die, pf); | |
754 | else | |
755 | ret = -ENOENT; | |
756 | free(scopes); | |
757 | } else | |
758 | ret = -ENOENT; | |
759 | } | |
760 | if (ret < 0) | |
b55a87ad MH |
761 | pr_warning("Failed to find '%s' in this function.\n", |
762 | pf->pvar->var); | |
b7dcb857 | 763 | return ret; |
4ea42b18 MH |
764 | } |
765 | ||
4ea42b18 | 766 | /* Show a probe point to output buffer */ |
b55a87ad | 767 | static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 768 | { |
0e60836b | 769 | struct probe_trace_event *tev; |
e92b85e1 MH |
770 | Dwarf_Addr eaddr; |
771 | Dwarf_Die die_mem; | |
804b3606 | 772 | const char *name; |
4235b045 | 773 | int ret, i; |
804b3606 MH |
774 | Dwarf_Attribute fb_attr; |
775 | size_t nops; | |
4ea42b18 | 776 | |
ef4a3565 MH |
777 | if (pf->ntevs == pf->max_tevs) { |
778 | pr_warning("Too many( > %d) probe point found.\n", | |
779 | pf->max_tevs); | |
b55a87ad MH |
780 | return -ERANGE; |
781 | } | |
4235b045 MH |
782 | tev = &pf->tevs[pf->ntevs++]; |
783 | ||
e92b85e1 MH |
784 | /* If no real subprogram, find a real one */ |
785 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
95a3e4c4 | 786 | sp_die = die_find_real_subprogram(&pf->cu_die, |
e92b85e1 | 787 | pf->addr, &die_mem); |
b55a87ad MH |
788 | if (!sp_die) { |
789 | pr_warning("Failed to find probe point in any " | |
790 | "functions.\n"); | |
791 | return -ENOENT; | |
792 | } | |
e92b85e1 MH |
793 | } |
794 | ||
4235b045 | 795 | /* Copy the name of probe point */ |
804b3606 MH |
796 | name = dwarf_diename(sp_die); |
797 | if (name) { | |
b55a87ad MH |
798 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
799 | pr_warning("Failed to get entry pc of %s\n", | |
800 | dwarf_diename(sp_die)); | |
801 | return -ENOENT; | |
802 | } | |
02b95dad MH |
803 | tev->point.symbol = strdup(name); |
804 | if (tev->point.symbol == NULL) | |
805 | return -ENOMEM; | |
4235b045 MH |
806 | tev->point.offset = (unsigned long)(pf->addr - eaddr); |
807 | } else | |
4ea42b18 | 808 | /* This function has no name. */ |
4235b045 MH |
809 | tev->point.offset = (unsigned long)pf->addr; |
810 | ||
04ddd04b MH |
811 | /* Return probe must be on the head of a subprogram */ |
812 | if (pf->pev->point.retprobe) { | |
813 | if (tev->point.offset != 0) { | |
814 | pr_warning("Return probe must be on the head of" | |
815 | " a real function\n"); | |
816 | return -EINVAL; | |
817 | } | |
818 | tev->point.retprobe = true; | |
819 | } | |
820 | ||
4235b045 MH |
821 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
822 | tev->point.offset); | |
4ea42b18 | 823 | |
804b3606 MH |
824 | /* Get the frame base attribute/ops */ |
825 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 826 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 827 | if (ret <= 0 || nops == 0) { |
804b3606 | 828 | pf->fb_ops = NULL; |
7752f1b0 | 829 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
830 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
831 | pf->cfi != NULL) { | |
832 | Dwarf_Frame *frame; | |
b55a87ad MH |
833 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
834 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
835 | pr_warning("Failed to get CFA on 0x%jx\n", | |
836 | (uintmax_t)pf->addr); | |
837 | return -ENOENT; | |
838 | } | |
7752f1b0 | 839 | #endif |
a34a9854 | 840 | } |
804b3606 | 841 | |
4ea42b18 | 842 | /* Find each argument */ |
4235b045 | 843 | tev->nargs = pf->pev->nargs; |
0e60836b | 844 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
845 | if (tev->args == NULL) |
846 | return -ENOMEM; | |
4235b045 MH |
847 | for (i = 0; i < pf->pev->nargs; i++) { |
848 | pf->pvar = &pf->pev->args[i]; | |
849 | pf->tvar = &tev->args[i]; | |
b55a87ad MH |
850 | ret = find_variable(sp_die, pf); |
851 | if (ret != 0) | |
852 | return ret; | |
4ea42b18 | 853 | } |
804b3606 MH |
854 | |
855 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
856 | pf->fb_ops = NULL; | |
b55a87ad | 857 | return 0; |
4ea42b18 MH |
858 | } |
859 | ||
4ea42b18 | 860 | /* Find probe point from its line number */ |
b55a87ad | 861 | static int find_probe_point_by_line(struct probe_finder *pf) |
4ea42b18 | 862 | { |
804b3606 MH |
863 | Dwarf_Lines *lines; |
864 | Dwarf_Line *line; | |
865 | size_t nlines, i; | |
e92b85e1 | 866 | Dwarf_Addr addr; |
804b3606 | 867 | int lineno; |
b55a87ad | 868 | int ret = 0; |
4ea42b18 | 869 | |
b55a87ad MH |
870 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
871 | pr_warning("No source lines found in this CU.\n"); | |
872 | return -ENOENT; | |
873 | } | |
4ea42b18 | 874 | |
b55a87ad | 875 | for (i = 0; i < nlines && ret == 0; i++) { |
804b3606 | 876 | line = dwarf_onesrcline(lines, i); |
b55a87ad MH |
877 | if (dwarf_lineno(line, &lineno) != 0 || |
878 | lineno != pf->lno) | |
4ea42b18 MH |
879 | continue; |
880 | ||
804b3606 MH |
881 | /* TODO: Get fileno from line, but how? */ |
882 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
883 | continue; | |
b0ef0732 | 884 | |
b55a87ad MH |
885 | if (dwarf_lineaddr(line, &addr) != 0) { |
886 | pr_warning("Failed to get the address of the line.\n"); | |
887 | return -ENOENT; | |
888 | } | |
804b3606 MH |
889 | pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n", |
890 | (int)i, lineno, (uintmax_t)addr); | |
4ea42b18 | 891 | pf->addr = addr; |
804b3606 | 892 | |
b55a87ad | 893 | ret = convert_probe_point(NULL, pf); |
4ea42b18 MH |
894 | /* Continuing, because target line might be inlined. */ |
895 | } | |
b55a87ad | 896 | return ret; |
4ea42b18 MH |
897 | } |
898 | ||
2a9c8c36 MH |
899 | /* Find lines which match lazy pattern */ |
900 | static int find_lazy_match_lines(struct list_head *head, | |
901 | const char *fname, const char *pat) | |
902 | { | |
903 | char *fbuf, *p1, *p2; | |
b448c4b6 | 904 | int fd, line, nlines = -1; |
2a9c8c36 MH |
905 | struct stat st; |
906 | ||
907 | fd = open(fname, O_RDONLY); | |
b55a87ad MH |
908 | if (fd < 0) { |
909 | pr_warning("Failed to open %s: %s\n", fname, strerror(-fd)); | |
b448c4b6 | 910 | return -errno; |
b55a87ad MH |
911 | } |
912 | ||
b448c4b6 | 913 | if (fstat(fd, &st) < 0) { |
b55a87ad MH |
914 | pr_warning("Failed to get the size of %s: %s\n", |
915 | fname, strerror(errno)); | |
b448c4b6 ACM |
916 | nlines = -errno; |
917 | goto out_close; | |
b55a87ad | 918 | } |
b448c4b6 ACM |
919 | |
920 | nlines = -ENOMEM; | |
921 | fbuf = malloc(st.st_size + 2); | |
922 | if (fbuf == NULL) | |
923 | goto out_close; | |
924 | if (read(fd, fbuf, st.st_size) < 0) { | |
b55a87ad | 925 | pr_warning("Failed to read %s: %s\n", fname, strerror(errno)); |
b448c4b6 ACM |
926 | nlines = -errno; |
927 | goto out_free_fbuf; | |
b55a87ad | 928 | } |
2a9c8c36 MH |
929 | fbuf[st.st_size] = '\n'; /* Dummy line */ |
930 | fbuf[st.st_size + 1] = '\0'; | |
931 | p1 = fbuf; | |
932 | line = 1; | |
b448c4b6 | 933 | nlines = 0; |
2a9c8c36 MH |
934 | while ((p2 = strchr(p1, '\n')) != NULL) { |
935 | *p2 = '\0'; | |
936 | if (strlazymatch(p1, pat)) { | |
937 | line_list__add_line(head, line); | |
938 | nlines++; | |
939 | } | |
940 | line++; | |
941 | p1 = p2 + 1; | |
942 | } | |
b448c4b6 | 943 | out_free_fbuf: |
2a9c8c36 | 944 | free(fbuf); |
b448c4b6 ACM |
945 | out_close: |
946 | close(fd); | |
2a9c8c36 MH |
947 | return nlines; |
948 | } | |
949 | ||
950 | /* Find probe points from lazy pattern */ | |
b55a87ad | 951 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 MH |
952 | { |
953 | Dwarf_Lines *lines; | |
954 | Dwarf_Line *line; | |
955 | size_t nlines, i; | |
956 | Dwarf_Addr addr; | |
957 | Dwarf_Die die_mem; | |
958 | int lineno; | |
b55a87ad | 959 | int ret = 0; |
2a9c8c36 MH |
960 | |
961 | if (list_empty(&pf->lcache)) { | |
962 | /* Matching lazy line pattern */ | |
963 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 964 | pf->pev->point.lazy_line); |
b55a87ad MH |
965 | if (ret == 0) { |
966 | pr_debug("No matched lines found in %s.\n", pf->fname); | |
967 | return 0; | |
968 | } else if (ret < 0) | |
969 | return ret; | |
2a9c8c36 MH |
970 | } |
971 | ||
b55a87ad MH |
972 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
973 | pr_warning("No source lines found in this CU.\n"); | |
974 | return -ENOENT; | |
975 | } | |
976 | ||
977 | for (i = 0; i < nlines && ret >= 0; i++) { | |
2a9c8c36 MH |
978 | line = dwarf_onesrcline(lines, i); |
979 | ||
b55a87ad MH |
980 | if (dwarf_lineno(line, &lineno) != 0 || |
981 | !line_list__has_line(&pf->lcache, lineno)) | |
2a9c8c36 MH |
982 | continue; |
983 | ||
984 | /* TODO: Get fileno from line, but how? */ | |
985 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
986 | continue; | |
987 | ||
b55a87ad MH |
988 | if (dwarf_lineaddr(line, &addr) != 0) { |
989 | pr_debug("Failed to get the address of line %d.\n", | |
990 | lineno); | |
991 | continue; | |
992 | } | |
2a9c8c36 MH |
993 | if (sp_die) { |
994 | /* Address filtering 1: does sp_die include addr? */ | |
995 | if (!dwarf_haspc(sp_die, addr)) | |
996 | continue; | |
997 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 998 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
2a9c8c36 MH |
999 | continue; |
1000 | } | |
1001 | ||
1002 | pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n", | |
1003 | (int)i, lineno, (unsigned long long)addr); | |
1004 | pf->addr = addr; | |
1005 | ||
b55a87ad | 1006 | ret = convert_probe_point(sp_die, pf); |
2a9c8c36 MH |
1007 | /* Continuing, because target line might be inlined. */ |
1008 | } | |
1009 | /* TODO: deallocate lines, but how? */ | |
b55a87ad | 1010 | return ret; |
2a9c8c36 MH |
1011 | } |
1012 | ||
b55a87ad MH |
1013 | /* Callback parameter with return value */ |
1014 | struct dwarf_callback_param { | |
1015 | void *data; | |
1016 | int retval; | |
1017 | }; | |
1018 | ||
e92b85e1 MH |
1019 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1020 | { | |
b55a87ad MH |
1021 | struct dwarf_callback_param *param = data; |
1022 | struct probe_finder *pf = param->data; | |
4235b045 | 1023 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1024 | Dwarf_Addr addr; |
e92b85e1 | 1025 | |
2a9c8c36 | 1026 | if (pp->lazy_line) |
b55a87ad | 1027 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1028 | else { |
1029 | /* Get probe address */ | |
b55a87ad MH |
1030 | if (dwarf_entrypc(in_die, &addr) != 0) { |
1031 | pr_warning("Failed to get entry pc of %s.\n", | |
1032 | dwarf_diename(in_die)); | |
1033 | param->retval = -ENOENT; | |
1034 | return DWARF_CB_ABORT; | |
1035 | } | |
1036 | pf->addr = addr; | |
2a9c8c36 MH |
1037 | pf->addr += pp->offset; |
1038 | pr_debug("found inline addr: 0x%jx\n", | |
1039 | (uintmax_t)pf->addr); | |
1040 | ||
b55a87ad | 1041 | param->retval = convert_probe_point(in_die, pf); |
5d1ee041 MH |
1042 | if (param->retval < 0) |
1043 | return DWARF_CB_ABORT; | |
2a9c8c36 | 1044 | } |
e92b85e1 | 1045 | |
e92b85e1 MH |
1046 | return DWARF_CB_OK; |
1047 | } | |
804b3606 | 1048 | |
4ea42b18 | 1049 | /* Search function from function name */ |
e92b85e1 | 1050 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1051 | { |
b55a87ad MH |
1052 | struct dwarf_callback_param *param = data; |
1053 | struct probe_finder *pf = param->data; | |
4235b045 | 1054 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1055 | |
e92b85e1 MH |
1056 | /* Check tag and diename */ |
1057 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 1058 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 1059 | return DWARF_CB_OK; |
e92b85e1 | 1060 | |
2a9c8c36 | 1061 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1062 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1063 | dwarf_decl_line(sp_die, &pf->lno); |
1064 | pf->lno += pp->line; | |
b55a87ad | 1065 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1066 | } else if (!dwarf_func_inline(sp_die)) { |
1067 | /* Real function */ | |
2a9c8c36 | 1068 | if (pp->lazy_line) |
b55a87ad | 1069 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1070 | else { |
b55a87ad MH |
1071 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
1072 | pr_warning("Failed to get entry pc of %s.\n", | |
1073 | dwarf_diename(sp_die)); | |
1074 | param->retval = -ENOENT; | |
1075 | return DWARF_CB_ABORT; | |
1076 | } | |
2a9c8c36 MH |
1077 | pf->addr += pp->offset; |
1078 | /* TODO: Check the address in this function */ | |
b55a87ad | 1079 | param->retval = convert_probe_point(sp_die, pf); |
2a9c8c36 | 1080 | } |
b55a87ad MH |
1081 | } else { |
1082 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1083 | .retval = 0}; | |
e92b85e1 | 1084 | /* Inlined function: search instances */ |
b55a87ad MH |
1085 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1086 | &_param); | |
1087 | param->retval = _param.retval; | |
1088 | } | |
e92b85e1 | 1089 | |
b55a87ad | 1090 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1091 | } |
1092 | ||
b55a87ad | 1093 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1094 | { |
b55a87ad MH |
1095 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1096 | .retval = 0}; | |
1097 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1098 | return _param.retval; | |
4ea42b18 MH |
1099 | } |
1100 | ||
0e60836b SD |
1101 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ |
1102 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1103 | struct probe_trace_event **tevs, int max_tevs) | |
4ea42b18 | 1104 | { |
ef4a3565 | 1105 | struct probe_finder pf = {.pev = pev, .max_tevs = max_tevs}; |
4235b045 | 1106 | struct perf_probe_point *pp = &pev->point; |
804b3606 MH |
1107 | Dwarf_Off off, noff; |
1108 | size_t cuhl; | |
1109 | Dwarf_Die *diep; | |
1110 | Dwarf *dbg; | |
b55a87ad | 1111 | int ret = 0; |
804b3606 | 1112 | |
0e60836b | 1113 | pf.tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); |
e334016f MH |
1114 | if (pf.tevs == NULL) |
1115 | return -ENOMEM; | |
4235b045 MH |
1116 | *tevs = pf.tevs; |
1117 | pf.ntevs = 0; | |
1118 | ||
804b3606 | 1119 | dbg = dwarf_begin(fd, DWARF_C_READ); |
b55a87ad MH |
1120 | if (!dbg) { |
1121 | pr_warning("No dwarf info found in the vmlinux - " | |
1122 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
b448c4b6 ACM |
1123 | free(pf.tevs); |
1124 | *tevs = NULL; | |
b55a87ad MH |
1125 | return -EBADF; |
1126 | } | |
4ea42b18 | 1127 | |
7752f1b0 | 1128 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
1129 | /* Get the call frame information from this dwarf */ |
1130 | pf.cfi = dwarf_getcfi(dbg); | |
7752f1b0 | 1131 | #endif |
a34a9854 | 1132 | |
804b3606 | 1133 | off = 0; |
2a9c8c36 | 1134 | line_list__init(&pf.lcache); |
804b3606 | 1135 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1136 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) && |
1137 | ret >= 0) { | |
4ea42b18 | 1138 | /* Get the DIE(Debugging Information Entry) of this CU */ |
804b3606 MH |
1139 | diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die); |
1140 | if (!diep) | |
1141 | continue; | |
4ea42b18 MH |
1142 | |
1143 | /* Check if target file is included. */ | |
1144 | if (pp->file) | |
2a9c8c36 | 1145 | pf.fname = cu_find_realpath(&pf.cu_die, pp->file); |
804b3606 | 1146 | else |
2a9c8c36 | 1147 | pf.fname = NULL; |
4ea42b18 | 1148 | |
2a9c8c36 | 1149 | if (!pp->file || pf.fname) { |
4ea42b18 | 1150 | if (pp->function) |
b55a87ad | 1151 | ret = find_probe_point_by_func(&pf); |
2a9c8c36 | 1152 | else if (pp->lazy_line) |
b55a87ad | 1153 | ret = find_probe_point_lazy(NULL, &pf); |
b0ef0732 MH |
1154 | else { |
1155 | pf.lno = pp->line; | |
b55a87ad | 1156 | ret = find_probe_point_by_line(&pf); |
b0ef0732 | 1157 | } |
4ea42b18 | 1158 | } |
804b3606 | 1159 | off = noff; |
4ea42b18 | 1160 | } |
2a9c8c36 | 1161 | line_list__free(&pf.lcache); |
804b3606 | 1162 | dwarf_end(dbg); |
4ea42b18 | 1163 | |
b55a87ad | 1164 | return (ret < 0) ? ret : pf.ntevs; |
4ea42b18 MH |
1165 | } |
1166 | ||
fb1587d8 MH |
1167 | /* Reverse search */ |
1168 | int find_perf_probe_point(int fd, unsigned long addr, | |
1169 | struct perf_probe_point *ppt) | |
1170 | { | |
1171 | Dwarf_Die cudie, spdie, indie; | |
1172 | Dwarf *dbg; | |
1173 | Dwarf_Line *line; | |
1174 | Dwarf_Addr laddr, eaddr; | |
1175 | const char *tmp; | |
1176 | int lineno, ret = 0; | |
b55a87ad | 1177 | bool found = false; |
fb1587d8 MH |
1178 | |
1179 | dbg = dwarf_begin(fd, DWARF_C_READ); | |
1180 | if (!dbg) | |
b55a87ad | 1181 | return -EBADF; |
fb1587d8 MH |
1182 | |
1183 | /* Find cu die */ | |
75ec5a24 MH |
1184 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr, &cudie)) { |
1185 | ret = -EINVAL; | |
1186 | goto end; | |
1187 | } | |
fb1587d8 MH |
1188 | |
1189 | /* Find a corresponding line */ | |
1190 | line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr); | |
1191 | if (line) { | |
b55a87ad MH |
1192 | if (dwarf_lineaddr(line, &laddr) == 0 && |
1193 | (Dwarf_Addr)addr == laddr && | |
1194 | dwarf_lineno(line, &lineno) == 0) { | |
fb1587d8 | 1195 | tmp = dwarf_linesrc(line, NULL, NULL); |
b55a87ad MH |
1196 | if (tmp) { |
1197 | ppt->line = lineno; | |
02b95dad MH |
1198 | ppt->file = strdup(tmp); |
1199 | if (ppt->file == NULL) { | |
1200 | ret = -ENOMEM; | |
1201 | goto end; | |
1202 | } | |
b55a87ad MH |
1203 | found = true; |
1204 | } | |
fb1587d8 MH |
1205 | } |
1206 | } | |
1207 | ||
1208 | /* Find a corresponding function */ | |
1209 | if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) { | |
1210 | tmp = dwarf_diename(&spdie); | |
b55a87ad | 1211 | if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0) |
fb1587d8 MH |
1212 | goto end; |
1213 | ||
b55a87ad MH |
1214 | if (ppt->line) { |
1215 | if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1216 | &indie)) { | |
1217 | /* addr in an inline function */ | |
1218 | tmp = dwarf_diename(&indie); | |
1219 | if (!tmp) | |
1220 | goto end; | |
1221 | ret = dwarf_decl_line(&indie, &lineno); | |
1222 | } else { | |
1223 | if (eaddr == addr) { /* Function entry */ | |
1224 | lineno = ppt->line; | |
1225 | ret = 0; | |
1226 | } else | |
1227 | ret = dwarf_decl_line(&spdie, &lineno); | |
1228 | } | |
1229 | if (ret == 0) { | |
1230 | /* Make a relative line number */ | |
1231 | ppt->line -= lineno; | |
1232 | goto found; | |
1233 | } | |
fb1587d8 | 1234 | } |
b55a87ad MH |
1235 | /* We don't have a line number, let's use offset */ |
1236 | ppt->offset = addr - (unsigned long)eaddr; | |
1237 | found: | |
02b95dad MH |
1238 | ppt->function = strdup(tmp); |
1239 | if (ppt->function == NULL) { | |
1240 | ret = -ENOMEM; | |
1241 | goto end; | |
1242 | } | |
b55a87ad | 1243 | found = true; |
fb1587d8 MH |
1244 | } |
1245 | ||
1246 | end: | |
1247 | dwarf_end(dbg); | |
b55a87ad MH |
1248 | if (ret >= 0) |
1249 | ret = found ? 1 : 0; | |
fb1587d8 MH |
1250 | return ret; |
1251 | } | |
1252 | ||
f6c903f5 MH |
1253 | /* Add a line and store the src path */ |
1254 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1255 | struct line_range *lr) | |
1256 | { | |
7cf0b79e | 1257 | /* Copy source path */ |
f6c903f5 | 1258 | if (!lr->path) { |
7cf0b79e MH |
1259 | lr->path = strdup(src); |
1260 | if (lr->path == NULL) | |
1261 | return -ENOMEM; | |
f6c903f5 MH |
1262 | } |
1263 | return line_list__add_line(&lr->line_list, lineno); | |
1264 | } | |
1265 | ||
1266 | /* Search function declaration lines */ | |
1267 | static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data) | |
1268 | { | |
1269 | struct dwarf_callback_param *param = data; | |
1270 | struct line_finder *lf = param->data; | |
1271 | const char *src; | |
1272 | int lineno; | |
1273 | ||
1274 | src = dwarf_decl_file(sp_die); | |
1275 | if (src && strtailcmp(src, lf->fname) != 0) | |
1276 | return DWARF_CB_OK; | |
1277 | ||
1278 | if (dwarf_decl_line(sp_die, &lineno) != 0 || | |
1279 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
1280 | return DWARF_CB_OK; | |
1281 | ||
1282 | param->retval = line_range_add_line(src, lineno, lf->lr); | |
5d1ee041 MH |
1283 | if (param->retval < 0) |
1284 | return DWARF_CB_ABORT; | |
f6c903f5 MH |
1285 | return DWARF_CB_OK; |
1286 | } | |
1287 | ||
1288 | static int find_line_range_func_decl_lines(struct line_finder *lf) | |
1289 | { | |
1290 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; | |
1291 | dwarf_getfuncs(&lf->cu_die, line_range_funcdecl_cb, ¶m, 0); | |
1292 | return param.retval; | |
1293 | } | |
fb1587d8 | 1294 | |
631c9def | 1295 | /* Find line range from its line number */ |
b55a87ad | 1296 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1297 | { |
804b3606 MH |
1298 | Dwarf_Lines *lines; |
1299 | Dwarf_Line *line; | |
1300 | size_t nlines, i; | |
631c9def | 1301 | Dwarf_Addr addr; |
f6c903f5 | 1302 | int lineno, ret = 0; |
804b3606 | 1303 | const char *src; |
161a26b0 | 1304 | Dwarf_Die die_mem; |
631c9def | 1305 | |
2a9c8c36 | 1306 | line_list__init(&lf->lr->line_list); |
b55a87ad MH |
1307 | if (dwarf_getsrclines(&lf->cu_die, &lines, &nlines) != 0) { |
1308 | pr_warning("No source lines found in this CU.\n"); | |
1309 | return -ENOENT; | |
1310 | } | |
631c9def | 1311 | |
f6c903f5 | 1312 | /* Search probable lines on lines list */ |
804b3606 MH |
1313 | for (i = 0; i < nlines; i++) { |
1314 | line = dwarf_onesrcline(lines, i); | |
b55a87ad MH |
1315 | if (dwarf_lineno(line, &lineno) != 0 || |
1316 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
631c9def MH |
1317 | continue; |
1318 | ||
161a26b0 MH |
1319 | if (sp_die) { |
1320 | /* Address filtering 1: does sp_die include addr? */ | |
b55a87ad MH |
1321 | if (dwarf_lineaddr(line, &addr) != 0 || |
1322 | !dwarf_haspc(sp_die, addr)) | |
161a26b0 MH |
1323 | continue; |
1324 | ||
1325 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 1326 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
161a26b0 MH |
1327 | continue; |
1328 | } | |
1329 | ||
804b3606 MH |
1330 | /* TODO: Get fileno from line, but how? */ |
1331 | src = dwarf_linesrc(line, NULL, NULL); | |
1332 | if (strtailcmp(src, lf->fname) != 0) | |
631c9def MH |
1333 | continue; |
1334 | ||
f6c903f5 MH |
1335 | ret = line_range_add_line(src, lineno, lf->lr); |
1336 | if (ret < 0) | |
1337 | return ret; | |
631c9def | 1338 | } |
f6c903f5 MH |
1339 | |
1340 | /* | |
1341 | * Dwarf lines doesn't include function declarations. We have to | |
1342 | * check functions list or given function. | |
1343 | */ | |
1344 | if (sp_die) { | |
1345 | src = dwarf_decl_file(sp_die); | |
1346 | if (src && dwarf_decl_line(sp_die, &lineno) == 0 && | |
1347 | (lf->lno_s <= lineno && lf->lno_e >= lineno)) | |
1348 | ret = line_range_add_line(src, lineno, lf->lr); | |
1349 | } else | |
1350 | ret = find_line_range_func_decl_lines(lf); | |
1351 | ||
804b3606 | 1352 | /* Update status */ |
f6c903f5 MH |
1353 | if (ret >= 0) |
1354 | if (!list_empty(&lf->lr->line_list)) | |
1355 | ret = lf->found = 1; | |
1356 | else | |
1357 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1358 | else { |
1359 | free(lf->lr->path); | |
1360 | lf->lr->path = NULL; | |
1361 | } | |
f6c903f5 | 1362 | return ret; |
631c9def MH |
1363 | } |
1364 | ||
161a26b0 MH |
1365 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1366 | { | |
b55a87ad MH |
1367 | struct dwarf_callback_param *param = data; |
1368 | ||
1369 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1370 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1371 | } | |
1372 | ||
631c9def | 1373 | /* Search function from function name */ |
e92b85e1 | 1374 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1375 | { |
b55a87ad MH |
1376 | struct dwarf_callback_param *param = data; |
1377 | struct line_finder *lf = param->data; | |
631c9def | 1378 | struct line_range *lr = lf->lr; |
631c9def | 1379 | |
e92b85e1 | 1380 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1381 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1382 | lf->fname = dwarf_decl_file(sp_die); |
1383 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1384 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1385 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1386 | if (lf->lno_s < 0) /* Overflow */ |
1387 | lf->lno_s = INT_MAX; | |
1388 | lf->lno_e = lr->offset + lr->end; | |
1389 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1390 | lf->lno_e = INT_MAX; |
d3b63d7a | 1391 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1392 | lr->start = lf->lno_s; |
1393 | lr->end = lf->lno_e; | |
b55a87ad MH |
1394 | if (dwarf_func_inline(sp_die)) { |
1395 | struct dwarf_callback_param _param; | |
1396 | _param.data = (void *)lf; | |
1397 | _param.retval = 0; | |
161a26b0 | 1398 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1399 | line_range_inline_cb, |
1400 | &_param); | |
1401 | param->retval = _param.retval; | |
1402 | } else | |
1403 | param->retval = find_line_range_by_line(sp_die, lf); | |
1404 | return DWARF_CB_ABORT; | |
631c9def | 1405 | } |
b55a87ad | 1406 | return DWARF_CB_OK; |
631c9def MH |
1407 | } |
1408 | ||
b55a87ad | 1409 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1410 | { |
b55a87ad MH |
1411 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1412 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1413 | return param.retval; | |
631c9def MH |
1414 | } |
1415 | ||
1416 | int find_line_range(int fd, struct line_range *lr) | |
1417 | { | |
804b3606 | 1418 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1419 | int ret = 0; |
804b3606 MH |
1420 | Dwarf_Off off = 0, noff; |
1421 | size_t cuhl; | |
1422 | Dwarf_Die *diep; | |
1423 | Dwarf *dbg; | |
6a330a3c | 1424 | const char *comp_dir; |
804b3606 MH |
1425 | |
1426 | dbg = dwarf_begin(fd, DWARF_C_READ); | |
b55a87ad MH |
1427 | if (!dbg) { |
1428 | pr_warning("No dwarf info found in the vmlinux - " | |
1429 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
1430 | return -EBADF; | |
1431 | } | |
631c9def | 1432 | |
804b3606 | 1433 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1434 | while (!lf.found && ret >= 0) { |
1435 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
1436 | break; |
1437 | ||
1438 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
1439 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
1440 | if (!diep) | |
1441 | continue; | |
631c9def MH |
1442 | |
1443 | /* Check if target file is included. */ | |
1444 | if (lr->file) | |
2a9c8c36 | 1445 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1446 | else |
2a9c8c36 | 1447 | lf.fname = 0; |
631c9def | 1448 | |
2a9c8c36 | 1449 | if (!lr->file || lf.fname) { |
631c9def | 1450 | if (lr->function) |
b55a87ad | 1451 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1452 | else { |
1453 | lf.lno_s = lr->start; | |
d3b63d7a | 1454 | lf.lno_e = lr->end; |
b55a87ad | 1455 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1456 | } |
631c9def | 1457 | } |
804b3606 | 1458 | off = noff; |
631c9def | 1459 | } |
6a330a3c MH |
1460 | |
1461 | /* Store comp_dir */ | |
1462 | if (lf.found) { | |
1463 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1464 | if (comp_dir) { | |
1465 | lr->comp_dir = strdup(comp_dir); | |
1466 | if (!lr->comp_dir) | |
1467 | ret = -ENOMEM; | |
1468 | } | |
1469 | } | |
1470 | ||
7cf0b79e | 1471 | pr_debug("path: %s\n", lr->path); |
804b3606 | 1472 | dwarf_end(dbg); |
b55a87ad MH |
1473 | |
1474 | return (ret < 0) ? ret : lf.found; | |
631c9def MH |
1475 | } |
1476 |