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 | |
124bb83c | 36 | #include <linux/bitops.h> |
89c69c0e MH |
37 | #include "event.h" |
38 | #include "debug.h" | |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
2a9c8c36 MH |
46 | /* Line number list operations */ |
47 | ||
48 | /* Add a line to line number list */ | |
d3b63d7a | 49 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
50 | { |
51 | struct line_node *ln; | |
52 | struct list_head *p; | |
53 | ||
54 | /* Reverse search, because new line will be the last one */ | |
55 | list_for_each_entry_reverse(ln, head, list) { | |
56 | if (ln->line < line) { | |
57 | p = &ln->list; | |
58 | goto found; | |
59 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 60 | return 1; |
2a9c8c36 MH |
61 | } |
62 | /* List is empty, or the smallest entry */ | |
63 | p = head; | |
64 | found: | |
65 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
66 | ln = zalloc(sizeof(struct line_node)); |
67 | if (ln == NULL) | |
68 | return -ENOMEM; | |
2a9c8c36 MH |
69 | ln->line = line; |
70 | INIT_LIST_HEAD(&ln->list); | |
71 | list_add(&ln->list, p); | |
e334016f | 72 | return 0; |
2a9c8c36 MH |
73 | } |
74 | ||
75 | /* Check if the line in line number list */ | |
d3b63d7a | 76 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
77 | { |
78 | struct line_node *ln; | |
79 | ||
80 | /* Reverse search, because new line will be the last one */ | |
81 | list_for_each_entry(ln, head, list) | |
82 | if (ln->line == line) | |
83 | return 1; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | /* Init line number list */ | |
89 | static void line_list__init(struct list_head *head) | |
90 | { | |
91 | INIT_LIST_HEAD(head); | |
92 | } | |
93 | ||
94 | /* Free line number list */ | |
95 | static void line_list__free(struct list_head *head) | |
96 | { | |
97 | struct line_node *ln; | |
98 | while (!list_empty(head)) { | |
99 | ln = list_first_entry(head, struct line_node, list); | |
100 | list_del(&ln->list); | |
101 | free(ln); | |
102 | } | |
103 | } | |
104 | ||
469b9b88 | 105 | /* Dwarf FL wrappers */ |
469b9b88 MH |
106 | static char *debuginfo_path; /* Currently dummy */ |
107 | ||
108 | static const Dwfl_Callbacks offline_callbacks = { | |
109 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
110 | .debuginfo_path = &debuginfo_path, | |
111 | ||
112 | .section_address = dwfl_offline_section_address, | |
113 | ||
114 | /* We use this table for core files too. */ | |
115 | .find_elf = dwfl_build_id_find_elf, | |
116 | }; | |
117 | ||
469b9b88 MH |
118 | /* Get a Dwarf from offline image */ |
119 | static Dwarf *dwfl_init_offline_dwarf(int fd, Dwfl **dwflp, Dwarf_Addr *bias) | |
120 | { | |
121 | Dwfl_Module *mod; | |
122 | Dwarf *dbg = NULL; | |
123 | ||
124 | if (!dwflp) | |
125 | return NULL; | |
126 | ||
127 | *dwflp = dwfl_begin(&offline_callbacks); | |
128 | if (!*dwflp) | |
129 | return NULL; | |
130 | ||
131 | mod = dwfl_report_offline(*dwflp, "", "", fd); | |
132 | if (!mod) | |
133 | goto error; | |
134 | ||
135 | dbg = dwfl_module_getdwarf(mod, bias); | |
136 | if (!dbg) { | |
137 | error: | |
138 | dwfl_end(*dwflp); | |
139 | *dwflp = NULL; | |
140 | } | |
141 | return dbg; | |
142 | } | |
143 | ||
3b4694de MH |
144 | #if _ELFUTILS_PREREQ(0, 148) |
145 | /* This method is buggy if elfutils is older than 0.148 */ | |
146 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
147 | void **userdata, | |
148 | const char *module_name, | |
149 | Dwarf_Addr base, | |
150 | char **file_name, Elf **elfp) | |
151 | { | |
152 | int fd; | |
153 | const char *path = kernel_get_module_path(module_name); | |
154 | ||
155 | pr_debug2("Use file %s for %s\n", path, module_name); | |
156 | if (path) { | |
157 | fd = open(path, O_RDONLY); | |
158 | if (fd >= 0) { | |
159 | *file_name = strdup(path); | |
160 | return fd; | |
161 | } | |
162 | } | |
163 | /* If failed, try to call standard method */ | |
164 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
165 | file_name, elfp); | |
166 | } | |
167 | ||
168 | static const Dwfl_Callbacks kernel_callbacks = { | |
169 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
170 | .debuginfo_path = &debuginfo_path, | |
171 | ||
172 | .find_elf = __linux_kernel_find_elf, | |
173 | .section_address = dwfl_linux_kernel_module_section_address, | |
174 | }; | |
175 | ||
469b9b88 MH |
176 | /* Get a Dwarf from live kernel image */ |
177 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr, Dwfl **dwflp, | |
178 | Dwarf_Addr *bias) | |
179 | { | |
180 | Dwarf *dbg; | |
181 | ||
182 | if (!dwflp) | |
183 | return NULL; | |
184 | ||
185 | *dwflp = dwfl_begin(&kernel_callbacks); | |
186 | if (!*dwflp) | |
187 | return NULL; | |
188 | ||
189 | /* Load the kernel dwarves: Don't care the result here */ | |
190 | dwfl_linux_kernel_report_kernel(*dwflp); | |
191 | dwfl_linux_kernel_report_modules(*dwflp); | |
192 | ||
193 | dbg = dwfl_addrdwarf(*dwflp, addr, bias); | |
194 | /* Here, check whether we could get a real dwarf */ | |
195 | if (!dbg) { | |
3b4694de MH |
196 | pr_debug("Failed to find kernel dwarf at %lx\n", |
197 | (unsigned long)addr); | |
469b9b88 MH |
198 | dwfl_end(*dwflp); |
199 | *dwflp = NULL; | |
200 | } | |
201 | return dbg; | |
202 | } | |
3b4694de MH |
203 | #else |
204 | /* With older elfutils, this just support kernel module... */ | |
205 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr __used, Dwfl **dwflp, | |
206 | Dwarf_Addr *bias) | |
207 | { | |
208 | int fd; | |
209 | const char *path = kernel_get_module_path("kernel"); | |
210 | ||
211 | if (!path) { | |
212 | pr_err("Failed to find vmlinux path\n"); | |
213 | return NULL; | |
214 | } | |
215 | ||
216 | pr_debug2("Use file %s for debuginfo\n", path); | |
217 | fd = open(path, O_RDONLY); | |
218 | if (fd < 0) | |
219 | return NULL; | |
220 | ||
221 | return dwfl_init_offline_dwarf(fd, dwflp, bias); | |
222 | } | |
223 | #endif | |
469b9b88 | 224 | |
4ea42b18 MH |
225 | /* |
226 | * Probe finder related functions | |
227 | */ | |
228 | ||
0e60836b | 229 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 230 | { |
0e60836b SD |
231 | struct probe_trace_arg_ref *ref; |
232 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
233 | if (ref != NULL) |
234 | ref->offset = offs; | |
235 | return ref; | |
236 | } | |
237 | ||
cf6eb489 MH |
238 | /* |
239 | * Convert a location into trace_arg. | |
240 | * If tvar == NULL, this just checks variable can be converted. | |
241 | */ | |
242 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
243 | Dwarf_Op *fb_ops, | |
244 | struct probe_trace_arg *tvar) | |
4ea42b18 | 245 | { |
b7dcb857 MH |
246 | Dwarf_Attribute attr; |
247 | Dwarf_Op *op; | |
248 | size_t nops; | |
804b3606 MH |
249 | unsigned int regn; |
250 | Dwarf_Word offs = 0; | |
4235b045 | 251 | bool ref = false; |
4ea42b18 | 252 | const char *regs; |
b7dcb857 MH |
253 | int ret; |
254 | ||
632941c4 MH |
255 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
256 | goto static_var; | |
257 | ||
b7dcb857 MH |
258 | /* TODO: handle more than 1 exprs */ |
259 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 260 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
261 | nops == 0) { |
262 | /* TODO: Support const_value */ | |
b7dcb857 MH |
263 | return -ENOENT; |
264 | } | |
265 | ||
266 | if (op->atom == DW_OP_addr) { | |
632941c4 | 267 | static_var: |
cf6eb489 MH |
268 | if (!tvar) |
269 | return 0; | |
b7dcb857 MH |
270 | /* Static variables on memory (not stack), make @varname */ |
271 | ret = strlen(dwarf_diename(vr_die)); | |
272 | tvar->value = zalloc(ret + 2); | |
273 | if (tvar->value == NULL) | |
274 | return -ENOMEM; | |
275 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
276 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
277 | if (tvar->ref == NULL) | |
278 | return -ENOMEM; | |
279 | return 0; | |
280 | } | |
4ea42b18 | 281 | |
4ea42b18 | 282 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 283 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 284 | if (fb_ops == NULL) |
b55a87ad | 285 | return -ENOTSUP; |
4235b045 | 286 | ref = true; |
804b3606 | 287 | offs = op->number; |
cf6eb489 | 288 | op = &fb_ops[0]; |
804b3606 | 289 | } |
4ea42b18 | 290 | |
804b3606 MH |
291 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
292 | regn = op->atom - DW_OP_breg0; | |
293 | offs += op->number; | |
4235b045 | 294 | ref = true; |
804b3606 MH |
295 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
296 | regn = op->atom - DW_OP_reg0; | |
297 | } else if (op->atom == DW_OP_bregx) { | |
298 | regn = op->number; | |
299 | offs += op->number2; | |
4235b045 | 300 | ref = true; |
804b3606 MH |
301 | } else if (op->atom == DW_OP_regx) { |
302 | regn = op->number; | |
b55a87ad | 303 | } else { |
cf6eb489 | 304 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
305 | return -ENOTSUP; |
306 | } | |
4ea42b18 | 307 | |
cf6eb489 MH |
308 | if (!tvar) |
309 | return 0; | |
310 | ||
4ea42b18 | 311 | regs = get_arch_regstr(regn); |
b55a87ad | 312 | if (!regs) { |
cf6eb489 | 313 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
314 | pr_warning("Mapping for the register number %u " |
315 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
316 | return -ERANGE; |
317 | } | |
4ea42b18 | 318 | |
02b95dad MH |
319 | tvar->value = strdup(regs); |
320 | if (tvar->value == NULL) | |
321 | return -ENOMEM; | |
322 | ||
4235b045 | 323 | if (ref) { |
b7dcb857 | 324 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
325 | if (tvar->ref == NULL) |
326 | return -ENOMEM; | |
4235b045 | 327 | } |
b55a87ad | 328 | return 0; |
4ea42b18 MH |
329 | } |
330 | ||
124bb83c MH |
331 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
332 | ||
b55a87ad | 333 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 334 | struct probe_trace_arg *tvar, |
73317b95 | 335 | const char *cast) |
4984912e | 336 | { |
0e60836b | 337 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
338 | Dwarf_Die type; |
339 | char buf[16]; | |
bcfc0821 | 340 | int bsize, boffs, total; |
4984912e MH |
341 | int ret; |
342 | ||
73317b95 MH |
343 | /* TODO: check all types */ |
344 | if (cast && strcmp(cast, "string") != 0) { | |
345 | /* Non string type is OK */ | |
346 | tvar->type = strdup(cast); | |
347 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
348 | } | |
349 | ||
bcfc0821 MH |
350 | bsize = dwarf_bitsize(vr_die); |
351 | if (bsize > 0) { | |
124bb83c | 352 | /* This is a bitfield */ |
bcfc0821 MH |
353 | boffs = dwarf_bitoffset(vr_die); |
354 | total = dwarf_bytesize(vr_die); | |
355 | if (boffs < 0 || total < 0) | |
356 | return -ENOENT; | |
357 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
358 | BYTES_TO_BITS(total)); | |
124bb83c MH |
359 | goto formatted; |
360 | } | |
361 | ||
b55a87ad MH |
362 | if (die_get_real_type(vr_die, &type) == NULL) { |
363 | pr_warning("Failed to get a type information of %s.\n", | |
364 | dwarf_diename(vr_die)); | |
365 | return -ENOENT; | |
366 | } | |
4984912e | 367 | |
b2a3c12b MH |
368 | pr_debug("%s type is %s.\n", |
369 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
370 | ||
73317b95 MH |
371 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
372 | ret = dwarf_tag(&type); | |
373 | if (ret != DW_TAG_pointer_type && | |
374 | ret != DW_TAG_array_type) { | |
375 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 376 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
377 | dwarf_diename(vr_die), dwarf_diename(&type)); |
378 | return -EINVAL; | |
379 | } | |
380 | if (ret == DW_TAG_pointer_type) { | |
381 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
382 | pr_warning("Failed to get a type" |
383 | " information.\n"); | |
73317b95 MH |
384 | return -ENOENT; |
385 | } | |
386 | while (*ref_ptr) | |
387 | ref_ptr = &(*ref_ptr)->next; | |
388 | /* Add new reference with offset +0 */ | |
0e60836b | 389 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
390 | if (*ref_ptr == NULL) { |
391 | pr_warning("Out of memory error\n"); | |
392 | return -ENOMEM; | |
393 | } | |
394 | } | |
82175633 MH |
395 | if (!die_compare_name(&type, "char") && |
396 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 397 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 398 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
399 | dwarf_diename(vr_die)); |
400 | return -EINVAL; | |
401 | } | |
402 | tvar->type = strdup(cast); | |
403 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
404 | } | |
405 | ||
bcfc0821 MH |
406 | ret = dwarf_bytesize(&type); |
407 | if (ret <= 0) | |
124bb83c MH |
408 | /* No size ... try to use default type */ |
409 | return 0; | |
bcfc0821 | 410 | ret = BYTES_TO_BITS(ret); |
4984912e | 411 | |
124bb83c MH |
412 | /* Check the bitwidth */ |
413 | if (ret > MAX_BASIC_TYPE_BITS) { | |
414 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
415 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
416 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 417 | } |
124bb83c MH |
418 | ret = snprintf(buf, 16, "%c%d", |
419 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
420 | ||
421 | formatted: | |
422 | if (ret < 0 || ret >= 16) { | |
423 | if (ret >= 16) | |
424 | ret = -E2BIG; | |
425 | pr_warning("Failed to convert variable type: %s\n", | |
426 | strerror(-ret)); | |
427 | return ret; | |
428 | } | |
429 | tvar->type = strdup(buf); | |
430 | if (tvar->type == NULL) | |
431 | return -ENOMEM; | |
b55a87ad | 432 | return 0; |
4984912e MH |
433 | } |
434 | ||
b55a87ad | 435 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 436 | struct perf_probe_arg_field *field, |
0e60836b | 437 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 438 | Dwarf_Die *die_mem) |
7df2f329 | 439 | { |
0e60836b | 440 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
441 | Dwarf_Die type; |
442 | Dwarf_Word offs; | |
b2a3c12b | 443 | int ret, tag; |
7df2f329 MH |
444 | |
445 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
446 | if (die_get_real_type(vr_die, &type) == NULL) { |
447 | pr_warning("Failed to get the type of %s.\n", varname); | |
448 | return -ENOENT; | |
449 | } | |
b2a3c12b MH |
450 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
451 | tag = dwarf_tag(&type); | |
452 | ||
453 | if (field->name[0] == '[' && | |
454 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
455 | if (field->next) | |
456 | /* Save original type for next field */ | |
457 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
458 | /* Get the type of this array */ | |
459 | if (die_get_real_type(&type, &type) == NULL) { | |
460 | pr_warning("Failed to get the type of %s.\n", varname); | |
461 | return -ENOENT; | |
462 | } | |
463 | pr_debug2("Array real type: (%x)\n", | |
464 | (unsigned)dwarf_dieoffset(&type)); | |
465 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 466 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
467 | if (ref == NULL) |
468 | return -ENOMEM; | |
469 | if (*ref_ptr) | |
470 | (*ref_ptr)->next = ref; | |
471 | else | |
472 | *ref_ptr = ref; | |
473 | } | |
bcfc0821 | 474 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
475 | if (!field->next) |
476 | /* Save vr_die for converting types */ | |
477 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
478 | goto next; | |
479 | } else if (tag == DW_TAG_pointer_type) { | |
480 | /* Check the pointer and dereference */ | |
b55a87ad MH |
481 | if (!field->ref) { |
482 | pr_err("Semantic error: %s must be referred by '->'\n", | |
483 | field->name); | |
484 | return -EINVAL; | |
485 | } | |
7df2f329 | 486 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
487 | if (die_get_real_type(&type, &type) == NULL) { |
488 | pr_warning("Failed to get the type of %s.\n", varname); | |
489 | return -ENOENT; | |
490 | } | |
12e5a7ae | 491 | /* Verify it is a data structure */ |
b55a87ad MH |
492 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
493 | pr_warning("%s is not a data structure.\n", varname); | |
494 | return -EINVAL; | |
495 | } | |
12e5a7ae | 496 | |
0e60836b | 497 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
498 | if (ref == NULL) |
499 | return -ENOMEM; | |
7df2f329 MH |
500 | if (*ref_ptr) |
501 | (*ref_ptr)->next = ref; | |
502 | else | |
503 | *ref_ptr = ref; | |
504 | } else { | |
12e5a7ae | 505 | /* Verify it is a data structure */ |
b2a3c12b | 506 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
507 | pr_warning("%s is not a data structure.\n", varname); |
508 | return -EINVAL; | |
509 | } | |
b2a3c12b | 510 | if (field->name[0] == '[') { |
0e43e5d2 MH |
511 | pr_err("Semantic error: %s is not a pointor" |
512 | " nor array.\n", varname); | |
b2a3c12b MH |
513 | return -EINVAL; |
514 | } | |
b55a87ad MH |
515 | if (field->ref) { |
516 | pr_err("Semantic error: %s must be referred by '.'\n", | |
517 | field->name); | |
518 | return -EINVAL; | |
519 | } | |
520 | if (!ref) { | |
521 | pr_warning("Structure on a register is not " | |
522 | "supported yet.\n"); | |
523 | return -ENOTSUP; | |
524 | } | |
7df2f329 MH |
525 | } |
526 | ||
b55a87ad MH |
527 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
528 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
529 | dwarf_diename(&type), field->name); | |
530 | return -EINVAL; | |
531 | } | |
7df2f329 MH |
532 | |
533 | /* Get the offset of the field */ | |
de1439d8 MH |
534 | ret = die_get_data_member_location(die_mem, &offs); |
535 | if (ret < 0) { | |
b55a87ad | 536 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 537 | return ret; |
b55a87ad | 538 | } |
7df2f329 MH |
539 | ref->offset += (long)offs; |
540 | ||
b2a3c12b | 541 | next: |
7df2f329 MH |
542 | /* Converting next field */ |
543 | if (field->next) | |
b55a87ad | 544 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 545 | field->next, &ref, die_mem); |
b55a87ad MH |
546 | else |
547 | return 0; | |
7df2f329 MH |
548 | } |
549 | ||
4ea42b18 | 550 | /* Show a variables in kprobe event format */ |
b55a87ad | 551 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 552 | { |
4984912e | 553 | Dwarf_Die die_mem; |
4ea42b18 MH |
554 | int ret; |
555 | ||
b7dcb857 MH |
556 | pr_debug("Converting variable %s into trace event.\n", |
557 | dwarf_diename(vr_die)); | |
804b3606 | 558 | |
cf6eb489 MH |
559 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
560 | pf->tvar); | |
561 | if (ret == -ENOENT) | |
562 | pr_err("Failed to find the location of %s at this address.\n" | |
563 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
564 | else if (ret == -ENOTSUP) | |
565 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
566 | else if (pf->pvar->field) { | |
b55a87ad MH |
567 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
568 | pf->pvar->field, &pf->tvar->ref, | |
569 | &die_mem); | |
4984912e MH |
570 | vr_die = &die_mem; |
571 | } | |
73317b95 MH |
572 | if (ret == 0) |
573 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 574 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 575 | return ret; |
4ea42b18 MH |
576 | } |
577 | ||
4ea42b18 | 578 | /* Find a variable in a subprogram die */ |
b55a87ad | 579 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 580 | { |
b7dcb857 | 581 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 582 | char buf[32], *ptr; |
b7dcb857 | 583 | int ret, nscopes; |
4ea42b18 | 584 | |
367e94c1 MH |
585 | if (!is_c_varname(pf->pvar->var)) { |
586 | /* Copy raw parameters */ | |
587 | pf->tvar->value = strdup(pf->pvar->var); | |
588 | if (pf->tvar->value == NULL) | |
589 | return -ENOMEM; | |
590 | if (pf->pvar->type) { | |
591 | pf->tvar->type = strdup(pf->pvar->type); | |
592 | if (pf->tvar->type == NULL) | |
593 | return -ENOMEM; | |
594 | } | |
595 | if (pf->pvar->name) { | |
596 | pf->tvar->name = strdup(pf->pvar->name); | |
597 | if (pf->tvar->name == NULL) | |
598 | return -ENOMEM; | |
599 | } else | |
600 | pf->tvar->name = NULL; | |
601 | return 0; | |
602 | } | |
603 | ||
48481938 | 604 | if (pf->pvar->name) |
02b95dad | 605 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 606 | else { |
02b95dad MH |
607 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
608 | if (ret < 0) | |
609 | return ret; | |
11a1ca35 MH |
610 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
611 | if (ptr) | |
612 | *ptr = '_'; | |
02b95dad | 613 | pf->tvar->name = strdup(buf); |
48481938 | 614 | } |
02b95dad MH |
615 | if (pf->tvar->name == NULL) |
616 | return -ENOMEM; | |
48481938 | 617 | |
b55a87ad MH |
618 | pr_debug("Searching '%s' variable in context.\n", |
619 | pf->pvar->var); | |
620 | /* Search child die for local variables and parameters. */ | |
378eeaad | 621 | if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
622 | ret = convert_variable(&vr_die, pf); |
623 | else { | |
624 | /* Search upper class */ | |
625 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
632941c4 MH |
626 | while (nscopes-- > 1) { |
627 | pr_debug("Searching variables in %s\n", | |
628 | dwarf_diename(&scopes[nscopes])); | |
629 | /* We should check this scope, so give dummy address */ | |
630 | if (die_find_variable_at(&scopes[nscopes], | |
631 | pf->pvar->var, 0, | |
632 | &vr_die)) { | |
b7dcb857 | 633 | ret = convert_variable(&vr_die, pf); |
632941c4 MH |
634 | goto found; |
635 | } | |
636 | } | |
637 | if (scopes) | |
b7dcb857 | 638 | free(scopes); |
632941c4 | 639 | ret = -ENOENT; |
b7dcb857 | 640 | } |
632941c4 | 641 | found: |
b7dcb857 | 642 | if (ret < 0) |
b55a87ad MH |
643 | pr_warning("Failed to find '%s' in this function.\n", |
644 | pf->pvar->var); | |
b7dcb857 | 645 | return ret; |
4ea42b18 MH |
646 | } |
647 | ||
cf6eb489 MH |
648 | /* Convert subprogram DIE to trace point */ |
649 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
650 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 651 | { |
e92b85e1 | 652 | Dwarf_Addr eaddr; |
804b3606 | 653 | const char *name; |
e92b85e1 | 654 | |
4235b045 | 655 | /* Copy the name of probe point */ |
804b3606 MH |
656 | name = dwarf_diename(sp_die); |
657 | if (name) { | |
b55a87ad | 658 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 659 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
660 | dwarf_diename(sp_die)); |
661 | return -ENOENT; | |
662 | } | |
cf6eb489 MH |
663 | tp->symbol = strdup(name); |
664 | if (tp->symbol == NULL) | |
02b95dad | 665 | return -ENOMEM; |
cf6eb489 | 666 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 667 | } else |
4ea42b18 | 668 | /* This function has no name. */ |
cf6eb489 | 669 | tp->offset = (unsigned long)paddr; |
4235b045 | 670 | |
04ddd04b | 671 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
672 | if (retprobe) { |
673 | if (eaddr != paddr) { | |
04ddd04b | 674 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 675 | " a real function.\n"); |
04ddd04b MH |
676 | return -EINVAL; |
677 | } | |
cf6eb489 | 678 | tp->retprobe = true; |
04ddd04b MH |
679 | } |
680 | ||
cf6eb489 MH |
681 | return 0; |
682 | } | |
683 | ||
684 | /* Call probe_finder callback with real subprogram DIE */ | |
685 | static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf) | |
686 | { | |
687 | Dwarf_Die die_mem; | |
688 | Dwarf_Attribute fb_attr; | |
689 | size_t nops; | |
690 | int ret; | |
691 | ||
692 | /* If no real subprogram, find a real one */ | |
693 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
e0d153c6 | 694 | sp_die = die_find_realfunc(&pf->cu_die, pf->addr, &die_mem); |
cf6eb489 MH |
695 | if (!sp_die) { |
696 | pr_warning("Failed to find probe point in any " | |
697 | "functions.\n"); | |
698 | return -ENOENT; | |
699 | } | |
700 | } | |
4ea42b18 | 701 | |
804b3606 MH |
702 | /* Get the frame base attribute/ops */ |
703 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 704 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 705 | if (ret <= 0 || nops == 0) { |
804b3606 | 706 | pf->fb_ops = NULL; |
7752f1b0 | 707 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
708 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
709 | pf->cfi != NULL) { | |
710 | Dwarf_Frame *frame; | |
b55a87ad MH |
711 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
712 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 713 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
714 | (uintmax_t)pf->addr); |
715 | return -ENOENT; | |
716 | } | |
7752f1b0 | 717 | #endif |
a34a9854 | 718 | } |
804b3606 | 719 | |
cf6eb489 MH |
720 | /* Call finder's callback handler */ |
721 | ret = pf->callback(sp_die, pf); | |
804b3606 MH |
722 | |
723 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
724 | pf->fb_ops = NULL; | |
cf6eb489 MH |
725 | |
726 | return ret; | |
4ea42b18 MH |
727 | } |
728 | ||
4cc9cec6 MH |
729 | static int probe_point_line_walker(const char *fname, int lineno, |
730 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 731 | { |
4cc9cec6 MH |
732 | struct probe_finder *pf = data; |
733 | int ret; | |
4ea42b18 | 734 | |
4cc9cec6 MH |
735 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
736 | return 0; | |
4ea42b18 | 737 | |
4cc9cec6 MH |
738 | pf->addr = addr; |
739 | ret = call_probe_finder(NULL, pf); | |
b0ef0732 | 740 | |
4cc9cec6 | 741 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 742 | return ret < 0 ? ret : 0; |
4cc9cec6 | 743 | } |
804b3606 | 744 | |
4cc9cec6 MH |
745 | /* Find probe point from its line number */ |
746 | static int find_probe_point_by_line(struct probe_finder *pf) | |
747 | { | |
748 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
749 | } |
750 | ||
2a9c8c36 MH |
751 | /* Find lines which match lazy pattern */ |
752 | static int find_lazy_match_lines(struct list_head *head, | |
753 | const char *fname, const char *pat) | |
754 | { | |
f50c2169 FBH |
755 | FILE *fp; |
756 | char *line = NULL; | |
757 | size_t line_len; | |
758 | ssize_t len; | |
759 | int count = 0, linenum = 1; | |
760 | ||
761 | fp = fopen(fname, "r"); | |
762 | if (!fp) { | |
763 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 764 | return -errno; |
b55a87ad MH |
765 | } |
766 | ||
f50c2169 | 767 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 768 | |
f50c2169 FBH |
769 | if (line[len - 1] == '\n') |
770 | line[len - 1] = '\0'; | |
771 | ||
772 | if (strlazymatch(line, pat)) { | |
773 | line_list__add_line(head, linenum); | |
774 | count++; | |
2a9c8c36 | 775 | } |
f50c2169 | 776 | linenum++; |
2a9c8c36 | 777 | } |
f50c2169 FBH |
778 | |
779 | if (ferror(fp)) | |
780 | count = -errno; | |
781 | free(line); | |
782 | fclose(fp); | |
783 | ||
784 | if (count == 0) | |
785 | pr_debug("No matched lines found in %s.\n", fname); | |
786 | return count; | |
2a9c8c36 MH |
787 | } |
788 | ||
4cc9cec6 MH |
789 | static int probe_point_lazy_walker(const char *fname, int lineno, |
790 | Dwarf_Addr addr, void *data) | |
791 | { | |
792 | struct probe_finder *pf = data; | |
793 | int ret; | |
794 | ||
795 | if (!line_list__has_line(&pf->lcache, lineno) || | |
796 | strtailcmp(fname, pf->fname) != 0) | |
797 | return 0; | |
798 | ||
799 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
800 | lineno, (unsigned long long)addr); | |
801 | pf->addr = addr; | |
802 | ret = call_probe_finder(NULL, pf); | |
803 | ||
804 | /* | |
805 | * Continue if no error, because the lazy pattern will match | |
806 | * to other lines | |
807 | */ | |
5e814dd5 | 808 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
809 | } |
810 | ||
2a9c8c36 | 811 | /* Find probe points from lazy pattern */ |
b55a87ad | 812 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 813 | { |
b55a87ad | 814 | int ret = 0; |
2a9c8c36 MH |
815 | |
816 | if (list_empty(&pf->lcache)) { | |
817 | /* Matching lazy line pattern */ | |
818 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 819 | pf->pev->point.lazy_line); |
f50c2169 | 820 | if (ret <= 0) |
b55a87ad | 821 | return ret; |
2a9c8c36 MH |
822 | } |
823 | ||
4cc9cec6 | 824 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
825 | } |
826 | ||
b55a87ad MH |
827 | /* Callback parameter with return value */ |
828 | struct dwarf_callback_param { | |
829 | void *data; | |
830 | int retval; | |
831 | }; | |
832 | ||
e92b85e1 MH |
833 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
834 | { | |
b55a87ad MH |
835 | struct dwarf_callback_param *param = data; |
836 | struct probe_finder *pf = param->data; | |
4235b045 | 837 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 838 | Dwarf_Addr addr; |
e92b85e1 | 839 | |
2a9c8c36 | 840 | if (pp->lazy_line) |
b55a87ad | 841 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
842 | else { |
843 | /* Get probe address */ | |
b55a87ad | 844 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 845 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad MH |
846 | dwarf_diename(in_die)); |
847 | param->retval = -ENOENT; | |
848 | return DWARF_CB_ABORT; | |
849 | } | |
850 | pf->addr = addr; | |
2a9c8c36 MH |
851 | pf->addr += pp->offset; |
852 | pr_debug("found inline addr: 0x%jx\n", | |
853 | (uintmax_t)pf->addr); | |
854 | ||
cf6eb489 | 855 | param->retval = call_probe_finder(in_die, pf); |
5d1ee041 MH |
856 | if (param->retval < 0) |
857 | return DWARF_CB_ABORT; | |
2a9c8c36 | 858 | } |
e92b85e1 | 859 | |
e92b85e1 MH |
860 | return DWARF_CB_OK; |
861 | } | |
804b3606 | 862 | |
4ea42b18 | 863 | /* Search function from function name */ |
e92b85e1 | 864 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 865 | { |
b55a87ad MH |
866 | struct dwarf_callback_param *param = data; |
867 | struct probe_finder *pf = param->data; | |
4235b045 | 868 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 869 | |
e92b85e1 MH |
870 | /* Check tag and diename */ |
871 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 872 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 873 | return DWARF_CB_OK; |
e92b85e1 | 874 | |
7d21635a MH |
875 | /* Check declared file */ |
876 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
877 | return DWARF_CB_OK; | |
878 | ||
2a9c8c36 | 879 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 880 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
881 | dwarf_decl_line(sp_die, &pf->lno); |
882 | pf->lno += pp->line; | |
b55a87ad | 883 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
884 | } else if (!dwarf_func_inline(sp_die)) { |
885 | /* Real function */ | |
2a9c8c36 | 886 | if (pp->lazy_line) |
b55a87ad | 887 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 888 | else { |
b55a87ad | 889 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
890 | pr_warning("Failed to get entry address of " |
891 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
892 | param->retval = -ENOENT; |
893 | return DWARF_CB_ABORT; | |
894 | } | |
2a9c8c36 MH |
895 | pf->addr += pp->offset; |
896 | /* TODO: Check the address in this function */ | |
cf6eb489 | 897 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 898 | } |
b55a87ad MH |
899 | } else { |
900 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
901 | .retval = 0}; | |
e92b85e1 | 902 | /* Inlined function: search instances */ |
b55a87ad MH |
903 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
904 | &_param); | |
905 | param->retval = _param.retval; | |
906 | } | |
e92b85e1 | 907 | |
b55a87ad | 908 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
909 | } |
910 | ||
b55a87ad | 911 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 912 | { |
b55a87ad MH |
913 | struct dwarf_callback_param _param = {.data = (void *)pf, |
914 | .retval = 0}; | |
915 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
916 | return _param.retval; | |
4ea42b18 MH |
917 | } |
918 | ||
cd25f8bc LM |
919 | struct pubname_callback_param { |
920 | char *function; | |
921 | char *file; | |
922 | Dwarf_Die *cu_die; | |
923 | Dwarf_Die *sp_die; | |
924 | int found; | |
925 | }; | |
926 | ||
927 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
928 | { | |
929 | struct pubname_callback_param *param = data; | |
930 | ||
931 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
932 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
933 | return DWARF_CB_OK; | |
934 | ||
935 | if (die_compare_name(param->sp_die, param->function)) { | |
936 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) | |
937 | return DWARF_CB_OK; | |
938 | ||
939 | if (param->file && | |
940 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
941 | return DWARF_CB_OK; | |
942 | ||
943 | param->found = 1; | |
944 | return DWARF_CB_ABORT; | |
945 | } | |
946 | } | |
947 | ||
948 | return DWARF_CB_OK; | |
949 | } | |
950 | ||
cf6eb489 MH |
951 | /* Find probe points from debuginfo */ |
952 | static int find_probes(int fd, struct probe_finder *pf) | |
4ea42b18 | 953 | { |
cf6eb489 | 954 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
955 | Dwarf_Off off, noff; |
956 | size_t cuhl; | |
957 | Dwarf_Die *diep; | |
469b9b88 MH |
958 | Dwarf *dbg = NULL; |
959 | Dwfl *dwfl; | |
960 | Dwarf_Addr bias; /* Currently ignored */ | |
b55a87ad | 961 | int ret = 0; |
804b3606 | 962 | |
469b9b88 | 963 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 964 | if (!dbg) { |
0e43e5d2 | 965 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad | 966 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
f0c4801a | 967 | close(fd); /* Without dwfl_end(), fd isn't closed. */ |
b55a87ad MH |
968 | return -EBADF; |
969 | } | |
4ea42b18 | 970 | |
7752f1b0 | 971 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 972 | /* Get the call frame information from this dwarf */ |
cf6eb489 | 973 | pf->cfi = dwarf_getcfi(dbg); |
7752f1b0 | 974 | #endif |
a34a9854 | 975 | |
804b3606 | 976 | off = 0; |
cf6eb489 | 977 | line_list__init(&pf->lcache); |
cd25f8bc LM |
978 | |
979 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
980 | if (pp->function) { | |
981 | struct pubname_callback_param pubname_param = { | |
982 | .function = pp->function, | |
983 | .file = pp->file, | |
984 | .cu_die = &pf->cu_die, | |
985 | .sp_die = &pf->sp_die, | |
2b348a77 | 986 | .found = 0, |
cd25f8bc LM |
987 | }; |
988 | struct dwarf_callback_param probe_param = { | |
989 | .data = pf, | |
990 | }; | |
991 | ||
992 | dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0); | |
993 | if (pubname_param.found) { | |
994 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
995 | if (ret) | |
996 | goto found; | |
997 | } | |
998 | } | |
999 | ||
804b3606 | 1000 | /* Loop on CUs (Compilation Unit) */ |
8635bf6e | 1001 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1002 | /* Get the DIE(Debugging Information Entry) of this CU */ |
cf6eb489 | 1003 | diep = dwarf_offdie(dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1004 | if (!diep) |
1005 | continue; | |
4ea42b18 MH |
1006 | |
1007 | /* Check if target file is included. */ | |
1008 | if (pp->file) | |
cf6eb489 | 1009 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1010 | else |
cf6eb489 | 1011 | pf->fname = NULL; |
4ea42b18 | 1012 | |
cf6eb489 | 1013 | if (!pp->file || pf->fname) { |
4ea42b18 | 1014 | if (pp->function) |
cf6eb489 | 1015 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1016 | else if (pp->lazy_line) |
cf6eb489 | 1017 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1018 | else { |
cf6eb489 MH |
1019 | pf->lno = pp->line; |
1020 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1021 | } |
8635bf6e | 1022 | if (ret < 0) |
fbee632d | 1023 | break; |
4ea42b18 | 1024 | } |
804b3606 | 1025 | off = noff; |
4ea42b18 | 1026 | } |
cd25f8bc LM |
1027 | |
1028 | found: | |
cf6eb489 | 1029 | line_list__free(&pf->lcache); |
469b9b88 MH |
1030 | if (dwfl) |
1031 | dwfl_end(dwfl); | |
4ea42b18 | 1032 | |
cf6eb489 MH |
1033 | return ret; |
1034 | } | |
1035 | ||
1036 | /* Add a found probe point into trace event list */ | |
1037 | static int add_probe_trace_event(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1038 | { | |
1039 | struct trace_event_finder *tf = | |
1040 | container_of(pf, struct trace_event_finder, pf); | |
1041 | struct probe_trace_event *tev; | |
1042 | int ret, i; | |
1043 | ||
1044 | /* Check number of tevs */ | |
1045 | if (tf->ntevs == tf->max_tevs) { | |
1046 | pr_warning("Too many( > %d) probe point found.\n", | |
1047 | tf->max_tevs); | |
1048 | return -ERANGE; | |
1049 | } | |
1050 | tev = &tf->tevs[tf->ntevs++]; | |
1051 | ||
1052 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1053 | &tev->point); | |
1054 | if (ret < 0) | |
1055 | return ret; | |
1056 | ||
1057 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1058 | tev->point.offset); | |
1059 | ||
1060 | /* Find each argument */ | |
1061 | tev->nargs = pf->pev->nargs; | |
1062 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1063 | if (tev->args == NULL) | |
1064 | return -ENOMEM; | |
1065 | for (i = 0; i < pf->pev->nargs; i++) { | |
1066 | pf->pvar = &pf->pev->args[i]; | |
1067 | pf->tvar = &tev->args[i]; | |
1068 | ret = find_variable(sp_die, pf); | |
1069 | if (ret != 0) | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
1077 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1078 | struct probe_trace_event **tevs, int max_tevs) | |
1079 | { | |
1080 | struct trace_event_finder tf = { | |
1081 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1082 | .max_tevs = max_tevs}; | |
1083 | int ret; | |
1084 | ||
1085 | /* Allocate result tevs array */ | |
1086 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1087 | if (*tevs == NULL) | |
1088 | return -ENOMEM; | |
1089 | ||
1090 | tf.tevs = *tevs; | |
1091 | tf.ntevs = 0; | |
1092 | ||
1093 | ret = find_probes(fd, &tf.pf); | |
1094 | if (ret < 0) { | |
1095 | free(*tevs); | |
1096 | *tevs = NULL; | |
1097 | return ret; | |
1098 | } | |
1099 | ||
1100 | return (ret < 0) ? ret : tf.ntevs; | |
1101 | } | |
1102 | ||
1103 | #define MAX_VAR_LEN 64 | |
1104 | ||
1105 | /* Collect available variables in this scope */ | |
1106 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1107 | { | |
1108 | struct available_var_finder *af = data; | |
1109 | struct variable_list *vl; | |
1110 | char buf[MAX_VAR_LEN]; | |
1111 | int tag, ret; | |
1112 | ||
1113 | vl = &af->vls[af->nvls - 1]; | |
1114 | ||
1115 | tag = dwarf_tag(die_mem); | |
1116 | if (tag == DW_TAG_formal_parameter || | |
1117 | tag == DW_TAG_variable) { | |
1118 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1119 | af->pf.fb_ops, NULL); | |
1120 | if (ret == 0) { | |
1121 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1122 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1123 | if (ret > 0) |
1124 | strlist__add(vl->vars, buf); | |
1125 | } | |
1126 | } | |
1127 | ||
fb8c5a56 | 1128 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1129 | return DIE_FIND_CB_CONTINUE; |
1130 | else | |
1131 | return DIE_FIND_CB_SIBLING; | |
1132 | } | |
1133 | ||
1134 | /* Add a found vars into available variables list */ | |
1135 | static int add_available_vars(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1136 | { | |
1137 | struct available_var_finder *af = | |
1138 | container_of(pf, struct available_var_finder, pf); | |
1139 | struct variable_list *vl; | |
fb8c5a56 MH |
1140 | Dwarf_Die die_mem, *scopes = NULL; |
1141 | int ret, nscopes; | |
cf6eb489 MH |
1142 | |
1143 | /* Check number of tevs */ | |
1144 | if (af->nvls == af->max_vls) { | |
1145 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1146 | return -ERANGE; | |
1147 | } | |
1148 | vl = &af->vls[af->nvls++]; | |
1149 | ||
1150 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1151 | &vl->point); | |
1152 | if (ret < 0) | |
1153 | return ret; | |
1154 | ||
1155 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1156 | vl->point.offset); | |
1157 | ||
1158 | /* Find local variables */ | |
1159 | vl->vars = strlist__new(true, NULL); | |
1160 | if (vl->vars == NULL) | |
1161 | return -ENOMEM; | |
fb8c5a56 | 1162 | af->child = true; |
cf6eb489 MH |
1163 | die_find_child(sp_die, collect_variables_cb, (void *)af, &die_mem); |
1164 | ||
fb8c5a56 MH |
1165 | /* Find external variables */ |
1166 | if (!af->externs) | |
1167 | goto out; | |
1168 | /* Don't need to search child DIE for externs. */ | |
1169 | af->child = false; | |
1170 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
1171 | while (nscopes-- > 1) | |
1172 | die_find_child(&scopes[nscopes], collect_variables_cb, | |
1173 | (void *)af, &die_mem); | |
1174 | if (scopes) | |
1175 | free(scopes); | |
1176 | ||
1177 | out: | |
cf6eb489 MH |
1178 | if (strlist__empty(vl->vars)) { |
1179 | strlist__delete(vl->vars); | |
1180 | vl->vars = NULL; | |
1181 | } | |
1182 | ||
1183 | return ret; | |
1184 | } | |
1185 | ||
1186 | /* Find available variables at given probe point */ | |
1187 | int find_available_vars_at(int fd, struct perf_probe_event *pev, | |
fb8c5a56 MH |
1188 | struct variable_list **vls, int max_vls, |
1189 | bool externs) | |
cf6eb489 MH |
1190 | { |
1191 | struct available_var_finder af = { | |
1192 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1193 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1194 | int ret; |
1195 | ||
1196 | /* Allocate result vls array */ | |
1197 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1198 | if (*vls == NULL) | |
1199 | return -ENOMEM; | |
1200 | ||
1201 | af.vls = *vls; | |
1202 | af.nvls = 0; | |
1203 | ||
1204 | ret = find_probes(fd, &af.pf); | |
1205 | if (ret < 0) { | |
1206 | /* Free vlist for error */ | |
1207 | while (af.nvls--) { | |
1208 | if (af.vls[af.nvls].point.symbol) | |
1209 | free(af.vls[af.nvls].point.symbol); | |
1210 | if (af.vls[af.nvls].vars) | |
1211 | strlist__delete(af.vls[af.nvls].vars); | |
1212 | } | |
1213 | free(af.vls); | |
1214 | *vls = NULL; | |
1215 | return ret; | |
1216 | } | |
1217 | ||
1218 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1219 | } |
1220 | ||
fb1587d8 | 1221 | /* Reverse search */ |
469b9b88 | 1222 | int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt) |
fb1587d8 MH |
1223 | { |
1224 | Dwarf_Die cudie, spdie, indie; | |
469b9b88 MH |
1225 | Dwarf *dbg = NULL; |
1226 | Dwfl *dwfl = NULL; | |
1d46ea2a MH |
1227 | Dwarf_Addr _addr, baseaddr, bias = 0; |
1228 | const char *fname = NULL, *func = NULL, *tmp; | |
1229 | int baseline = 0, lineno = 0, ret = 0; | |
fb1587d8 | 1230 | |
469b9b88 MH |
1231 | /* Open the live linux kernel */ |
1232 | dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias); | |
1233 | if (!dbg) { | |
0e43e5d2 | 1234 | pr_warning("No debug information found in the vmlinux - " |
469b9b88 MH |
1235 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1236 | ret = -EINVAL; | |
1237 | goto end; | |
1238 | } | |
fb1587d8 | 1239 | |
469b9b88 MH |
1240 | /* Adjust address with bias */ |
1241 | addr += bias; | |
fb1587d8 | 1242 | /* Find cu die */ |
469b9b88 | 1243 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) { |
0e43e5d2 MH |
1244 | pr_warning("Failed to find debug information for address %lx\n", |
1245 | addr); | |
75ec5a24 MH |
1246 | ret = -EINVAL; |
1247 | goto end; | |
1248 | } | |
fb1587d8 | 1249 | |
1d46ea2a MH |
1250 | /* Find a corresponding line (filename and lineno) */ |
1251 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1252 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1253 | |
1d46ea2a | 1254 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1255 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1256 | /* Get function entry information */ |
fb1587d8 | 1257 | tmp = dwarf_diename(&spdie); |
1d46ea2a MH |
1258 | if (!tmp || |
1259 | dwarf_entrypc(&spdie, &baseaddr) != 0 || | |
1260 | dwarf_decl_line(&spdie, &baseline) != 0) | |
1261 | goto post; | |
1262 | func = tmp; | |
1263 | ||
1264 | if (addr == (unsigned long)baseaddr) | |
1265 | /* Function entry - Relative line number is 0 */ | |
1266 | lineno = baseline; | |
1267 | else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1268 | &indie)) { | |
1269 | if (dwarf_entrypc(&indie, &_addr) == 0 && | |
1270 | _addr == addr) | |
1271 | /* | |
1272 | * addr is at an inline function entry. | |
1273 | * In this case, lineno should be the call-site | |
1274 | * line number. | |
1275 | */ | |
1276 | lineno = die_get_call_lineno(&indie); | |
1277 | else { | |
1278 | /* | |
1279 | * addr is in an inline function body. | |
1280 | * Since lineno points one of the lines | |
1281 | * of the inline function, baseline should | |
1282 | * be the entry line of the inline function. | |
1283 | */ | |
b55a87ad | 1284 | tmp = dwarf_diename(&indie); |
1d46ea2a MH |
1285 | if (tmp && |
1286 | dwarf_decl_line(&spdie, &baseline) == 0) | |
1287 | func = tmp; | |
b55a87ad | 1288 | } |
fb1587d8 | 1289 | } |
1d46ea2a MH |
1290 | } |
1291 | ||
1292 | post: | |
1293 | /* Make a relative line number or an offset */ | |
1294 | if (lineno) | |
1295 | ppt->line = lineno - baseline; | |
1296 | else if (func) | |
1297 | ppt->offset = addr - (unsigned long)baseaddr; | |
1298 | ||
1299 | /* Duplicate strings */ | |
1300 | if (func) { | |
1301 | ppt->function = strdup(func); | |
02b95dad MH |
1302 | if (ppt->function == NULL) { |
1303 | ret = -ENOMEM; | |
1304 | goto end; | |
1305 | } | |
fb1587d8 | 1306 | } |
1d46ea2a MH |
1307 | if (fname) { |
1308 | ppt->file = strdup(fname); | |
1309 | if (ppt->file == NULL) { | |
1310 | if (ppt->function) { | |
1311 | free(ppt->function); | |
1312 | ppt->function = NULL; | |
1313 | } | |
1314 | ret = -ENOMEM; | |
1315 | goto end; | |
1316 | } | |
1317 | } | |
fb1587d8 | 1318 | end: |
469b9b88 MH |
1319 | if (dwfl) |
1320 | dwfl_end(dwfl); | |
1d46ea2a MH |
1321 | if (ret == 0 && (fname || func)) |
1322 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1323 | return ret; |
1324 | } | |
1325 | ||
f6c903f5 MH |
1326 | /* Add a line and store the src path */ |
1327 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1328 | struct line_range *lr) | |
1329 | { | |
7cf0b79e | 1330 | /* Copy source path */ |
f6c903f5 | 1331 | if (!lr->path) { |
7cf0b79e MH |
1332 | lr->path = strdup(src); |
1333 | if (lr->path == NULL) | |
1334 | return -ENOMEM; | |
f6c903f5 MH |
1335 | } |
1336 | return line_list__add_line(&lr->line_list, lineno); | |
1337 | } | |
1338 | ||
4cc9cec6 MH |
1339 | static int line_range_walk_cb(const char *fname, int lineno, |
1340 | Dwarf_Addr addr __used, | |
1341 | void *data) | |
f6c903f5 | 1342 | { |
4cc9cec6 | 1343 | struct line_finder *lf = data; |
f6c903f5 | 1344 | |
4cc9cec6 | 1345 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1346 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1347 | return 0; |
f6c903f5 | 1348 | |
4cc9cec6 MH |
1349 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1350 | return -EINVAL; | |
f6c903f5 | 1351 | |
4cc9cec6 | 1352 | return 0; |
f6c903f5 | 1353 | } |
fb1587d8 | 1354 | |
631c9def | 1355 | /* Find line range from its line number */ |
b55a87ad | 1356 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1357 | { |
4cc9cec6 | 1358 | int ret; |
f6c903f5 | 1359 | |
4cc9cec6 | 1360 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1361 | |
804b3606 | 1362 | /* Update status */ |
f6c903f5 MH |
1363 | if (ret >= 0) |
1364 | if (!list_empty(&lf->lr->line_list)) | |
1365 | ret = lf->found = 1; | |
1366 | else | |
1367 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1368 | else { |
1369 | free(lf->lr->path); | |
1370 | lf->lr->path = NULL; | |
1371 | } | |
f6c903f5 | 1372 | return ret; |
631c9def MH |
1373 | } |
1374 | ||
161a26b0 MH |
1375 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1376 | { | |
b55a87ad MH |
1377 | struct dwarf_callback_param *param = data; |
1378 | ||
1379 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1380 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1381 | } | |
1382 | ||
631c9def | 1383 | /* Search function from function name */ |
e92b85e1 | 1384 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1385 | { |
b55a87ad MH |
1386 | struct dwarf_callback_param *param = data; |
1387 | struct line_finder *lf = param->data; | |
631c9def | 1388 | struct line_range *lr = lf->lr; |
631c9def | 1389 | |
7d21635a MH |
1390 | /* Check declared file */ |
1391 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1392 | return DWARF_CB_OK; | |
1393 | ||
e92b85e1 | 1394 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1395 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1396 | lf->fname = dwarf_decl_file(sp_die); |
1397 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1398 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1399 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1400 | if (lf->lno_s < 0) /* Overflow */ |
1401 | lf->lno_s = INT_MAX; | |
1402 | lf->lno_e = lr->offset + lr->end; | |
1403 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1404 | lf->lno_e = INT_MAX; |
d3b63d7a | 1405 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1406 | lr->start = lf->lno_s; |
1407 | lr->end = lf->lno_e; | |
b55a87ad MH |
1408 | if (dwarf_func_inline(sp_die)) { |
1409 | struct dwarf_callback_param _param; | |
1410 | _param.data = (void *)lf; | |
1411 | _param.retval = 0; | |
161a26b0 | 1412 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1413 | line_range_inline_cb, |
1414 | &_param); | |
1415 | param->retval = _param.retval; | |
1416 | } else | |
1417 | param->retval = find_line_range_by_line(sp_die, lf); | |
1418 | return DWARF_CB_ABORT; | |
631c9def | 1419 | } |
b55a87ad | 1420 | return DWARF_CB_OK; |
631c9def MH |
1421 | } |
1422 | ||
b55a87ad | 1423 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1424 | { |
b55a87ad MH |
1425 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1426 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1427 | return param.retval; | |
631c9def MH |
1428 | } |
1429 | ||
1430 | int find_line_range(int fd, struct line_range *lr) | |
1431 | { | |
804b3606 | 1432 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1433 | int ret = 0; |
804b3606 MH |
1434 | Dwarf_Off off = 0, noff; |
1435 | size_t cuhl; | |
1436 | Dwarf_Die *diep; | |
469b9b88 MH |
1437 | Dwarf *dbg = NULL; |
1438 | Dwfl *dwfl; | |
1439 | Dwarf_Addr bias; /* Currently ignored */ | |
6a330a3c | 1440 | const char *comp_dir; |
804b3606 | 1441 | |
469b9b88 | 1442 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1443 | if (!dbg) { |
0e43e5d2 | 1444 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad | 1445 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
f0c4801a | 1446 | close(fd); /* Without dwfl_end(), fd isn't closed. */ |
b55a87ad MH |
1447 | return -EBADF; |
1448 | } | |
631c9def | 1449 | |
cd25f8bc LM |
1450 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1451 | if (lr->function) { | |
1452 | struct pubname_callback_param pubname_param = { | |
1453 | .function = lr->function, .file = lr->file, | |
1454 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1455 | struct dwarf_callback_param line_range_param = { | |
1456 | .data = (void *)&lf, .retval = 0}; | |
1457 | ||
1458 | dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0); | |
1459 | if (pubname_param.found) { | |
1460 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1461 | if (lf.found) | |
1462 | goto found; | |
1463 | } | |
1464 | } | |
1465 | ||
804b3606 | 1466 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1467 | while (!lf.found && ret >= 0) { |
1468 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
1469 | break; |
1470 | ||
1471 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
1472 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
1473 | if (!diep) | |
1474 | continue; | |
631c9def MH |
1475 | |
1476 | /* Check if target file is included. */ | |
1477 | if (lr->file) | |
2a9c8c36 | 1478 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1479 | else |
2a9c8c36 | 1480 | lf.fname = 0; |
631c9def | 1481 | |
2a9c8c36 | 1482 | if (!lr->file || lf.fname) { |
631c9def | 1483 | if (lr->function) |
b55a87ad | 1484 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1485 | else { |
1486 | lf.lno_s = lr->start; | |
d3b63d7a | 1487 | lf.lno_e = lr->end; |
b55a87ad | 1488 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1489 | } |
631c9def | 1490 | } |
804b3606 | 1491 | off = noff; |
631c9def | 1492 | } |
6a330a3c | 1493 | |
cd25f8bc | 1494 | found: |
6a330a3c MH |
1495 | /* Store comp_dir */ |
1496 | if (lf.found) { | |
1497 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1498 | if (comp_dir) { | |
1499 | lr->comp_dir = strdup(comp_dir); | |
1500 | if (!lr->comp_dir) | |
1501 | ret = -ENOMEM; | |
1502 | } | |
1503 | } | |
1504 | ||
7cf0b79e | 1505 | pr_debug("path: %s\n", lr->path); |
469b9b88 | 1506 | dwfl_end(dwfl); |
b55a87ad | 1507 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1508 | } |
1509 |