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ieee802154: verify packet size before trying to allocate it
[linux/fpc-iii.git] / tools / perf / util / probe-finder.c
blobd448984ed789c25ff3fc6524bc355d67bc2ad6cb
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 <dwarf-regs.h>
34
35 #include <linux/bitops.h>
36 #include "event.h"
37 #include "debug.h"
38 #include "util.h"
39 #include "symbol.h"
40 #include "probe-finder.h"
41
42 /* Kprobe tracer basic type is up to u64 */
43 #define MAX_BASIC_TYPE_BITS 64
44
45 /* Line number list operations */
46
47 /* Add a line to line number list */
48 static int line_list__add_line(struct list_head *head, int line)
49 {
50 struct line_node *ln;
51 struct list_head *p;
52
53 /* Reverse search, because new line will be the last one */
54 list_for_each_entry_reverse(ln, head, list) {
55 if (ln->line < line) {
56 p = &ln->list;
57 goto found;
58 } else if (ln->line == line) /* Already exist */
59 return 1;
60 }
61 /* List is empty, or the smallest entry */
62 p = head;
63 found:
64 pr_debug("line list: add a line %u\n", line);
65 ln = zalloc(sizeof(struct line_node));
66 if (ln == NULL)
67 return -ENOMEM;
68 ln->line = line;
69 INIT_LIST_HEAD(&ln->list);
70 list_add(&ln->list, p);
71 return 0;
72 }
73
74 /* Check if the line in line number list */
75 static int line_list__has_line(struct list_head *head, int line)
76 {
77 struct line_node *ln;
78
79 /* Reverse search, because new line will be the last one */
80 list_for_each_entry(ln, head, list)
81 if (ln->line == line)
82 return 1;
83
84 return 0;
85 }
86
87 /* Init line number list */
88 static void line_list__init(struct list_head *head)
89 {
90 INIT_LIST_HEAD(head);
91 }
92
93 /* Free line number list */
94 static void line_list__free(struct list_head *head)
95 {
96 struct line_node *ln;
97 while (!list_empty(head)) {
98 ln = list_first_entry(head, struct line_node, list);
99 list_del(&ln->list);
100 free(ln);
101 }
102 }
103
104 /* Dwarf FL wrappers */
105 static char *debuginfo_path; /* Currently dummy */
106
107 static const Dwfl_Callbacks offline_callbacks = {
108 .find_debuginfo = dwfl_standard_find_debuginfo,
109 .debuginfo_path = &debuginfo_path,
110
111 .section_address = dwfl_offline_section_address,
112
113 /* We use this table for core files too. */
114 .find_elf = dwfl_build_id_find_elf,
115 };
116
117 /* Get a Dwarf from offline image */
118 static int debuginfo__init_offline_dwarf(struct debuginfo *self,
119 const char *path)
120 {
121 Dwfl_Module *mod;
122 int fd;
123
124 fd = open(path, O_RDONLY);
125 if (fd < 0)
126 return fd;
127
128 self->dwfl = dwfl_begin(&offline_callbacks);
129 if (!self->dwfl)
130 goto error;
131
132 mod = dwfl_report_offline(self->dwfl, "", "", fd);
133 if (!mod)
134 goto error;
135
136 self->dbg = dwfl_module_getdwarf(mod, &self->bias);
137 if (!self->dbg)
138 goto error;
139
140 return 0;
141 error:
142 if (self->dwfl)
143 dwfl_end(self->dwfl);
144 else
145 close(fd);
146 memset(self, 0, sizeof(*self));
147
148 return -ENOENT;
149 }
150
151 #if _ELFUTILS_PREREQ(0, 148)
152 /* This method is buggy if elfutils is older than 0.148 */
153 static int __linux_kernel_find_elf(Dwfl_Module *mod,
154 void **userdata,
155 const char *module_name,
156 Dwarf_Addr base,
157 char **file_name, Elf **elfp)
158 {
159 int fd;
160 const char *path = kernel_get_module_path(module_name);
161
162 pr_debug2("Use file %s for %s\n", path, module_name);
163 if (path) {
164 fd = open(path, O_RDONLY);
165 if (fd >= 0) {
166 *file_name = strdup(path);
167 return fd;
168 }
169 }
170 /* If failed, try to call standard method */
171 return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base,
172 file_name, elfp);
173 }
174
175 static const Dwfl_Callbacks kernel_callbacks = {
176 .find_debuginfo = dwfl_standard_find_debuginfo,
177 .debuginfo_path = &debuginfo_path,
178
179 .find_elf = __linux_kernel_find_elf,
180 .section_address = dwfl_linux_kernel_module_section_address,
181 };
182
183 /* Get a Dwarf from live kernel image */
184 static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
185 Dwarf_Addr addr)
186 {
187 self->dwfl = dwfl_begin(&kernel_callbacks);
188 if (!self->dwfl)
189 return -EINVAL;
190
191 /* Load the kernel dwarves: Don't care the result here */
192 dwfl_linux_kernel_report_kernel(self->dwfl);
193 dwfl_linux_kernel_report_modules(self->dwfl);
194
195 self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias);
196 /* Here, check whether we could get a real dwarf */
197 if (!self->dbg) {
198 pr_debug("Failed to find kernel dwarf at %lx\n",
199 (unsigned long)addr);
200 dwfl_end(self->dwfl);
201 memset(self, 0, sizeof(*self));
202 return -ENOENT;
203 }
204
205 return 0;
206 }
207 #else
208 /* With older elfutils, this just support kernel module... */
209 static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
210 Dwarf_Addr addr __used)
211 {
212 const char *path = kernel_get_module_path("kernel");
213
214 if (!path) {
215 pr_err("Failed to find vmlinux path\n");
216 return -ENOENT;
217 }
218
219 pr_debug2("Use file %s for debuginfo\n", path);
220 return debuginfo__init_offline_dwarf(self, path);
221 }
222 #endif
223
224 struct debuginfo *debuginfo__new(const char *path)
225 {
226 struct debuginfo *self = zalloc(sizeof(struct debuginfo));
227 if (!self)
228 return NULL;
229
230 if (debuginfo__init_offline_dwarf(self, path) < 0) {
231 free(self);
232 self = NULL;
233 }
234
235 return self;
236 }
237
238 struct debuginfo *debuginfo__new_online_kernel(unsigned long addr)
239 {
240 struct debuginfo *self = zalloc(sizeof(struct debuginfo));
241 if (!self)
242 return NULL;
243
244 if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) {
245 free(self);
246 self = NULL;
247 }
248
249 return self;
250 }
251
252 void debuginfo__delete(struct debuginfo *self)
253 {
254 if (self) {
255 if (self->dwfl)
256 dwfl_end(self->dwfl);
257 free(self);
258 }
259 }
260
261 /*
262 * Probe finder related functions
263 */
264
265 static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
266 {
267 struct probe_trace_arg_ref *ref;
268 ref = zalloc(sizeof(struct probe_trace_arg_ref));
269 if (ref != NULL)
270 ref->offset = offs;
271 return ref;
272 }
273
274 /*
275 * Convert a location into trace_arg.
276 * If tvar == NULL, this just checks variable can be converted.
277 */
278 static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
279 Dwarf_Op *fb_ops,
280 struct probe_trace_arg *tvar)
281 {
282 Dwarf_Attribute attr;
283 Dwarf_Op *op;
284 size_t nops;
285 unsigned int regn;
286 Dwarf_Word offs = 0;
287 bool ref = false;
288 const char *regs;
289 int ret;
290
291 if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
292 goto static_var;
293
294 /* TODO: handle more than 1 exprs */
295 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL ||
296 dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 ||
297 nops == 0) {
298 /* TODO: Support const_value */
299 return -ENOENT;
300 }
301
302 if (op->atom == DW_OP_addr) {
303 static_var:
304 if (!tvar)
305 return 0;
306 /* Static variables on memory (not stack), make @varname */
307 ret = strlen(dwarf_diename(vr_die));
308 tvar->value = zalloc(ret + 2);
309 if (tvar->value == NULL)
310 return -ENOMEM;
311 snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
312 tvar->ref = alloc_trace_arg_ref((long)offs);
313 if (tvar->ref == NULL)
314 return -ENOMEM;
315 return 0;
316 }
317
318 /* If this is based on frame buffer, set the offset */
319 if (op->atom == DW_OP_fbreg) {
320 if (fb_ops == NULL)
321 return -ENOTSUP;
322 ref = true;
323 offs = op->number;
324 op = &fb_ops[0];
325 }
326
327 if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
328 regn = op->atom - DW_OP_breg0;
329 offs += op->number;
330 ref = true;
331 } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
332 regn = op->atom - DW_OP_reg0;
333 } else if (op->atom == DW_OP_bregx) {
334 regn = op->number;
335 offs += op->number2;
336 ref = true;
337 } else if (op->atom == DW_OP_regx) {
338 regn = op->number;
339 } else {
340 pr_debug("DW_OP %x is not supported.\n", op->atom);
341 return -ENOTSUP;
342 }
343
344 if (!tvar)
345 return 0;
346
347 regs = get_arch_regstr(regn);
348 if (!regs) {
349 /* This should be a bug in DWARF or this tool */
350 pr_warning("Mapping for the register number %u "
351 "missing on this architecture.\n", regn);
352 return -ERANGE;
353 }
354
355 tvar->value = strdup(regs);
356 if (tvar->value == NULL)
357 return -ENOMEM;
358
359 if (ref) {
360 tvar->ref = alloc_trace_arg_ref((long)offs);
361 if (tvar->ref == NULL)
362 return -ENOMEM;
363 }
364 return 0;
365 }
366
367 #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
368
369 static int convert_variable_type(Dwarf_Die *vr_die,
370 struct probe_trace_arg *tvar,
371 const char *cast)
372 {
373 struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
374 Dwarf_Die type;
375 char buf[16];
376 int bsize, boffs, total;
377 int ret;
378
379 /* TODO: check all types */
380 if (cast && strcmp(cast, "string") != 0) {
381 /* Non string type is OK */
382 tvar->type = strdup(cast);
383 return (tvar->type == NULL) ? -ENOMEM : 0;
384 }
385
386 bsize = dwarf_bitsize(vr_die);
387 if (bsize > 0) {
388 /* This is a bitfield */
389 boffs = dwarf_bitoffset(vr_die);
390 total = dwarf_bytesize(vr_die);
391 if (boffs < 0 || total < 0)
392 return -ENOENT;
393 ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
394 BYTES_TO_BITS(total));
395 goto formatted;
396 }
397
398 if (die_get_real_type(vr_die, &type) == NULL) {
399 pr_warning("Failed to get a type information of %s.\n",
400 dwarf_diename(vr_die));
401 return -ENOENT;
402 }
403
404 pr_debug("%s type is %s.\n",
405 dwarf_diename(vr_die), dwarf_diename(&type));
406
407 if (cast && strcmp(cast, "string") == 0) { /* String type */
408 ret = dwarf_tag(&type);
409 if (ret != DW_TAG_pointer_type &&
410 ret != DW_TAG_array_type) {
411 pr_warning("Failed to cast into string: "
412 "%s(%s) is not a pointer nor array.\n",
413 dwarf_diename(vr_die), dwarf_diename(&type));
414 return -EINVAL;
415 }
416 if (ret == DW_TAG_pointer_type) {
417 if (die_get_real_type(&type, &type) == NULL) {
418 pr_warning("Failed to get a type"
419 " information.\n");
420 return -ENOENT;
421 }
422 while (*ref_ptr)
423 ref_ptr = &(*ref_ptr)->next;
424 /* Add new reference with offset +0 */
425 *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
426 if (*ref_ptr == NULL) {
427 pr_warning("Out of memory error\n");
428 return -ENOMEM;
429 }
430 }
431 if (!die_compare_name(&type, "char") &&
432 !die_compare_name(&type, "unsigned char")) {
433 pr_warning("Failed to cast into string: "
434 "%s is not (unsigned) char *.\n",
435 dwarf_diename(vr_die));
436 return -EINVAL;
437 }
438 tvar->type = strdup(cast);
439 return (tvar->type == NULL) ? -ENOMEM : 0;
440 }
441
442 ret = dwarf_bytesize(&type);
443 if (ret <= 0)
444 /* No size ... try to use default type */
445 return 0;
446 ret = BYTES_TO_BITS(ret);
447
448 /* Check the bitwidth */
449 if (ret > MAX_BASIC_TYPE_BITS) {
450 pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
451 dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
452 ret = MAX_BASIC_TYPE_BITS;
453 }
454 ret = snprintf(buf, 16, "%c%d",
455 die_is_signed_type(&type) ? 's' : 'u', ret);
456
457 formatted:
458 if (ret < 0 || ret >= 16) {
459 if (ret >= 16)
460 ret = -E2BIG;
461 pr_warning("Failed to convert variable type: %s\n",
462 strerror(-ret));
463 return ret;
464 }
465 tvar->type = strdup(buf);
466 if (tvar->type == NULL)
467 return -ENOMEM;
468 return 0;
469 }
470
471 static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
472 struct perf_probe_arg_field *field,
473 struct probe_trace_arg_ref **ref_ptr,
474 Dwarf_Die *die_mem)
475 {
476 struct probe_trace_arg_ref *ref = *ref_ptr;
477 Dwarf_Die type;
478 Dwarf_Word offs;
479 int ret, tag;
480
481 pr_debug("converting %s in %s\n", field->name, varname);
482 if (die_get_real_type(vr_die, &type) == NULL) {
483 pr_warning("Failed to get the type of %s.\n", varname);
484 return -ENOENT;
485 }
486 pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type));
487 tag = dwarf_tag(&type);
488
489 if (field->name[0] == '[' &&
490 (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
491 if (field->next)
492 /* Save original type for next field */
493 memcpy(die_mem, &type, sizeof(*die_mem));
494 /* Get the type of this array */
495 if (die_get_real_type(&type, &type) == NULL) {
496 pr_warning("Failed to get the type of %s.\n", varname);
497 return -ENOENT;
498 }
499 pr_debug2("Array real type: (%x)\n",
500 (unsigned)dwarf_dieoffset(&type));
501 if (tag == DW_TAG_pointer_type) {
502 ref = zalloc(sizeof(struct probe_trace_arg_ref));
503 if (ref == NULL)
504 return -ENOMEM;
505 if (*ref_ptr)
506 (*ref_ptr)->next = ref;
507 else
508 *ref_ptr = ref;
509 }
510 ref->offset += dwarf_bytesize(&type) * field->index;
511 if (!field->next)
512 /* Save vr_die for converting types */
513 memcpy(die_mem, vr_die, sizeof(*die_mem));
514 goto next;
515 } else if (tag == DW_TAG_pointer_type) {
516 /* Check the pointer and dereference */
517 if (!field->ref) {
518 pr_err("Semantic error: %s must be referred by '->'\n",
519 field->name);
520 return -EINVAL;
521 }
522 /* Get the type pointed by this pointer */
523 if (die_get_real_type(&type, &type) == NULL) {
524 pr_warning("Failed to get the type of %s.\n", varname);
525 return -ENOENT;
526 }
527 /* Verify it is a data structure */
528 if (dwarf_tag(&type) != DW_TAG_structure_type) {
529 pr_warning("%s is not a data structure.\n", varname);
530 return -EINVAL;
531 }
532
533 ref = zalloc(sizeof(struct probe_trace_arg_ref));
534 if (ref == NULL)
535 return -ENOMEM;
536 if (*ref_ptr)
537 (*ref_ptr)->next = ref;
538 else
539 *ref_ptr = ref;
540 } else {
541 /* Verify it is a data structure */
542 if (tag != DW_TAG_structure_type) {
543 pr_warning("%s is not a data structure.\n", varname);
544 return -EINVAL;
545 }
546 if (field->name[0] == '[') {
547 pr_err("Semantic error: %s is not a pointor"
548 " nor array.\n", varname);
549 return -EINVAL;
550 }
551 if (field->ref) {
552 pr_err("Semantic error: %s must be referred by '.'\n",
553 field->name);
554 return -EINVAL;
555 }
556 if (!ref) {
557 pr_warning("Structure on a register is not "
558 "supported yet.\n");
559 return -ENOTSUP;
560 }
561 }
562
563 if (die_find_member(&type, field->name, die_mem) == NULL) {
564 pr_warning("%s(tyep:%s) has no member %s.\n", varname,
565 dwarf_diename(&type), field->name);
566 return -EINVAL;
567 }
568
569 /* Get the offset of the field */
570 ret = die_get_data_member_location(die_mem, &offs);
571 if (ret < 0) {
572 pr_warning("Failed to get the offset of %s.\n", field->name);
573 return ret;
574 }
575 ref->offset += (long)offs;
576
577 next:
578 /* Converting next field */
579 if (field->next)
580 return convert_variable_fields(die_mem, field->name,
581 field->next, &ref, die_mem);
582 else
583 return 0;
584 }
585
586 /* Show a variables in kprobe event format */
587 static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
588 {
589 Dwarf_Die die_mem;
590 int ret;
591
592 pr_debug("Converting variable %s into trace event.\n",
593 dwarf_diename(vr_die));
594
595 ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
596 pf->tvar);
597 if (ret == -ENOENT)
598 pr_err("Failed to find the location of %s at this address.\n"
599 " Perhaps, it has been optimized out.\n", pf->pvar->var);
600 else if (ret == -ENOTSUP)
601 pr_err("Sorry, we don't support this variable location yet.\n");
602 else if (pf->pvar->field) {
603 ret = convert_variable_fields(vr_die, pf->pvar->var,
604 pf->pvar->field, &pf->tvar->ref,
605 &die_mem);
606 vr_die = &die_mem;
607 }
608 if (ret == 0)
609 ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
610 /* *expr will be cached in libdw. Don't free it. */
611 return ret;
612 }
613
614 /* Find a variable in a scope DIE */
615 static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
616 {
617 Dwarf_Die vr_die;
618 char buf[32], *ptr;
619 int ret = 0;
620
621 if (!is_c_varname(pf->pvar->var)) {
622 /* Copy raw parameters */
623 pf->tvar->value = strdup(pf->pvar->var);
624 if (pf->tvar->value == NULL)
625 return -ENOMEM;
626 if (pf->pvar->type) {
627 pf->tvar->type = strdup(pf->pvar->type);
628 if (pf->tvar->type == NULL)
629 return -ENOMEM;
630 }
631 if (pf->pvar->name) {
632 pf->tvar->name = strdup(pf->pvar->name);
633 if (pf->tvar->name == NULL)
634 return -ENOMEM;
635 } else
636 pf->tvar->name = NULL;
637 return 0;
638 }
639
640 if (pf->pvar->name)
641 pf->tvar->name = strdup(pf->pvar->name);
642 else {
643 ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
644 if (ret < 0)
645 return ret;
646 ptr = strchr(buf, ':'); /* Change type separator to _ */
647 if (ptr)
648 *ptr = '_';
649 pf->tvar->name = strdup(buf);
650 }
651 if (pf->tvar->name == NULL)
652 return -ENOMEM;
653
654 pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
655 /* Search child die for local variables and parameters. */
656 if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
657 /* Search again in global variables */
658 if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
659 ret = -ENOENT;
660 }
661 if (ret >= 0)
662 ret = convert_variable(&vr_die, pf);
663
664 if (ret < 0)
665 pr_warning("Failed to find '%s' in this function.\n",
666 pf->pvar->var);
667 return ret;
668 }
669
670 /* Convert subprogram DIE to trace point */
671 static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr,
672 bool retprobe, struct probe_trace_point *tp)
673 {
674 Dwarf_Addr eaddr, highaddr;
675 const char *name;
676
677 /* Copy the name of probe point */
678 name = dwarf_diename(sp_die);
679 if (name) {
680 if (dwarf_entrypc(sp_die, &eaddr) != 0) {
681 pr_warning("Failed to get entry address of %s\n",
682 dwarf_diename(sp_die));
683 return -ENOENT;
684 }
685 if (dwarf_highpc(sp_die, &highaddr) != 0) {
686 pr_warning("Failed to get end address of %s\n",
687 dwarf_diename(sp_die));
688 return -ENOENT;
689 }
690 if (paddr > highaddr) {
691 pr_warning("Offset specified is greater than size of %s\n",
692 dwarf_diename(sp_die));
693 return -EINVAL;
694 }
695 tp->symbol = strdup(name);
696 if (tp->symbol == NULL)
697 return -ENOMEM;
698 tp->offset = (unsigned long)(paddr - eaddr);
699 } else
700 /* This function has no name. */
701 tp->offset = (unsigned long)paddr;
702
703 /* Return probe must be on the head of a subprogram */
704 if (retprobe) {
705 if (eaddr != paddr) {
706 pr_warning("Return probe must be on the head of"
707 " a real function.\n");
708 return -EINVAL;
709 }
710 tp->retprobe = true;
711 }
712
713 return 0;
714 }
715
716 /* Call probe_finder callback with scope DIE */
717 static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
718 {
719 Dwarf_Attribute fb_attr;
720 size_t nops;
721 int ret;
722
723 if (!sc_die) {
724 pr_err("Caller must pass a scope DIE. Program error.\n");
725 return -EINVAL;
726 }
727
728 /* If not a real subprogram, find a real one */
729 if (dwarf_tag(sc_die) != DW_TAG_subprogram) {
730 if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
731 pr_warning("Failed to find probe point in any "
732 "functions.\n");
733 return -ENOENT;
734 }
735 } else
736 memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
737
738 /* Get the frame base attribute/ops from subprogram */
739 dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
740 ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
741 if (ret <= 0 || nops == 0) {
742 pf->fb_ops = NULL;
743 #if _ELFUTILS_PREREQ(0, 142)
744 } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
745 pf->cfi != NULL) {
746 Dwarf_Frame *frame;
747 if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
748 dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
749 pr_warning("Failed to get call frame on 0x%jx\n",
750 (uintmax_t)pf->addr);
751 return -ENOENT;
752 }
753 #endif
754 }
755
756 /* Call finder's callback handler */
757 ret = pf->callback(sc_die, pf);
758
759 /* *pf->fb_ops will be cached in libdw. Don't free it. */
760 pf->fb_ops = NULL;
761
762 return ret;
763 }
764
765 struct find_scope_param {
766 const char *function;
767 const char *file;
768 int line;
769 int diff;
770 Dwarf_Die *die_mem;
771 bool found;
772 };
773
774 static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
775 {
776 struct find_scope_param *fsp = data;
777 const char *file;
778 int lno;
779
780 /* Skip if declared file name does not match */
781 if (fsp->file) {
782 file = dwarf_decl_file(fn_die);
783 if (!file || strcmp(fsp->file, file) != 0)
784 return 0;
785 }
786 /* If the function name is given, that's what user expects */
787 if (fsp->function) {
788 if (die_compare_name(fn_die, fsp->function)) {
789 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
790 fsp->found = true;
791 return 1;
792 }
793 } else {
794 /* With the line number, find the nearest declared DIE */
795 dwarf_decl_line(fn_die, &lno);
796 if (lno < fsp->line && fsp->diff > fsp->line - lno) {
797 /* Keep a candidate and continue */
798 fsp->diff = fsp->line - lno;
799 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
800 fsp->found = true;
801 }
802 }
803 return 0;
804 }
805
806 /* Find an appropriate scope fits to given conditions */
807 static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
808 {
809 struct find_scope_param fsp = {
810 .function = pf->pev->point.function,
811 .file = pf->fname,
812 .line = pf->lno,
813 .diff = INT_MAX,
814 .die_mem = die_mem,
815 .found = false,
816 };
817
818 cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp);
819
820 return fsp.found ? die_mem : NULL;
821 }
822
823 static int probe_point_line_walker(const char *fname, int lineno,
824 Dwarf_Addr addr, void *data)
825 {
826 struct probe_finder *pf = data;
827 Dwarf_Die *sc_die, die_mem;
828 int ret;
829
830 if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
831 return 0;
832
833 pf->addr = addr;
834 sc_die = find_best_scope(pf, &die_mem);
835 if (!sc_die) {
836 pr_warning("Failed to find scope of probe point.\n");
837 return -ENOENT;
838 }
839
840 ret = call_probe_finder(sc_die, pf);
841
842 /* Continue if no error, because the line will be in inline function */
843 return ret < 0 ? ret : 0;
844 }
845
846 /* Find probe point from its line number */
847 static int find_probe_point_by_line(struct probe_finder *pf)
848 {
849 return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
850 }
851
852 /* Find lines which match lazy pattern */
853 static int find_lazy_match_lines(struct list_head *head,
854 const char *fname, const char *pat)
855 {
856 FILE *fp;
857 char *line = NULL;
858 size_t line_len;
859 ssize_t len;
860 int count = 0, linenum = 1;
861
862 fp = fopen(fname, "r");
863 if (!fp) {
864 pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
865 return -errno;
866 }
867
868 while ((len = getline(&line, &line_len, fp)) > 0) {
869
870 if (line[len - 1] == '\n')
871 line[len - 1] = '\0';
872
873 if (strlazymatch(line, pat)) {
874 line_list__add_line(head, linenum);
875 count++;
876 }
877 linenum++;
878 }
879
880 if (ferror(fp))
881 count = -errno;
882 free(line);
883 fclose(fp);
884
885 if (count == 0)
886 pr_debug("No matched lines found in %s.\n", fname);
887 return count;
888 }
889
890 static int probe_point_lazy_walker(const char *fname, int lineno,
891 Dwarf_Addr addr, void *data)
892 {
893 struct probe_finder *pf = data;
894 Dwarf_Die *sc_die, die_mem;
895 int ret;
896
897 if (!line_list__has_line(&pf->lcache, lineno) ||
898 strtailcmp(fname, pf->fname) != 0)
899 return 0;
900
901 pr_debug("Probe line found: line:%d addr:0x%llx\n",
902 lineno, (unsigned long long)addr);
903 pf->addr = addr;
904 pf->lno = lineno;
905 sc_die = find_best_scope(pf, &die_mem);
906 if (!sc_die) {
907 pr_warning("Failed to find scope of probe point.\n");
908 return -ENOENT;
909 }
910
911 ret = call_probe_finder(sc_die, pf);
912
913 /*
914 * Continue if no error, because the lazy pattern will match
915 * to other lines
916 */
917 return ret < 0 ? ret : 0;
918 }
919
920 /* Find probe points from lazy pattern */
921 static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
922 {
923 int ret = 0;
924
925 if (list_empty(&pf->lcache)) {
926 /* Matching lazy line pattern */
927 ret = find_lazy_match_lines(&pf->lcache, pf->fname,
928 pf->pev->point.lazy_line);
929 if (ret <= 0)
930 return ret;
931 }
932
933 return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
934 }
935
936 static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
937 {
938 struct probe_finder *pf = data;
939 struct perf_probe_point *pp = &pf->pev->point;
940 Dwarf_Addr addr;
941 int ret;
942
943 if (pp->lazy_line)
944 ret = find_probe_point_lazy(in_die, pf);
945 else {
946 /* Get probe address */
947 if (dwarf_entrypc(in_die, &addr) != 0) {
948 pr_warning("Failed to get entry address of %s.\n",
949 dwarf_diename(in_die));
950 return -ENOENT;
951 }
952 pf->addr = addr;
953 pf->addr += pp->offset;
954 pr_debug("found inline addr: 0x%jx\n",
955 (uintmax_t)pf->addr);
956
957 ret = call_probe_finder(in_die, pf);
958 }
959
960 return ret;
961 }
962
963 /* Callback parameter with return value for libdw */
964 struct dwarf_callback_param {
965 void *data;
966 int retval;
967 };
968
969 /* Search function from function name */
970 static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
971 {
972 struct dwarf_callback_param *param = data;
973 struct probe_finder *pf = param->data;
974 struct perf_probe_point *pp = &pf->pev->point;
975 Dwarf_Attribute attr;
976
977 /* Check tag and diename */
978 if (dwarf_tag(sp_die) != DW_TAG_subprogram ||
979 !die_compare_name(sp_die, pp->function) ||
980 dwarf_attr(sp_die, DW_AT_declaration, &attr))
981 return DWARF_CB_OK;
982
983 /* Check declared file */
984 if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
985 return DWARF_CB_OK;
986
987 pf->fname = dwarf_decl_file(sp_die);
988 if (pp->line) { /* Function relative line */
989 dwarf_decl_line(sp_die, &pf->lno);
990 pf->lno += pp->line;
991 param->retval = find_probe_point_by_line(pf);
992 } else if (!dwarf_func_inline(sp_die)) {
993 /* Real function */
994 if (pp->lazy_line)
995 param->retval = find_probe_point_lazy(sp_die, pf);
996 else {
997 if (dwarf_entrypc(sp_die, &pf->addr) != 0) {
998 pr_warning("Failed to get entry address of "
999 "%s.\n", dwarf_diename(sp_die));
1000 param->retval = -ENOENT;
1001 return DWARF_CB_ABORT;
1002 }
1003 pf->addr += pp->offset;
1004 /* TODO: Check the address in this function */
1005 param->retval = call_probe_finder(sp_die, pf);
1006 }
1007 } else
1008 /* Inlined function: search instances */
1009 param->retval = die_walk_instances(sp_die,
1010 probe_point_inline_cb, (void *)pf);
1011
1012 return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */
1013 }
1014
1015 static int find_probe_point_by_func(struct probe_finder *pf)
1016 {
1017 struct dwarf_callback_param _param = {.data = (void *)pf,
1018 .retval = 0};
1019 dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
1020 return _param.retval;
1021 }
1022
1023 struct pubname_callback_param {
1024 char *function;
1025 char *file;
1026 Dwarf_Die *cu_die;
1027 Dwarf_Die *sp_die;
1028 int found;
1029 };
1030
1031 static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
1032 {
1033 struct pubname_callback_param *param = data;
1034
1035 if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
1036 if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
1037 return DWARF_CB_OK;
1038
1039 if (die_compare_name(param->sp_die, param->function)) {
1040 if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
1041 return DWARF_CB_OK;
1042
1043 if (param->file &&
1044 strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
1045 return DWARF_CB_OK;
1046
1047 param->found = 1;
1048 return DWARF_CB_ABORT;
1049 }
1050 }
1051
1052 return DWARF_CB_OK;
1053 }
1054
1055 /* Find probe points from debuginfo */
1056 static int debuginfo__find_probes(struct debuginfo *self,
1057 struct probe_finder *pf)
1058 {
1059 struct perf_probe_point *pp = &pf->pev->point;
1060 Dwarf_Off off, noff;
1061 size_t cuhl;
1062 Dwarf_Die *diep;
1063 int ret = 0;
1064
1065 #if _ELFUTILS_PREREQ(0, 142)
1066 /* Get the call frame information from this dwarf */
1067 pf->cfi = dwarf_getcfi(self->dbg);
1068 #endif
1069
1070 off = 0;
1071 line_list__init(&pf->lcache);
1072
1073 /* Fastpath: lookup by function name from .debug_pubnames section */
1074 if (pp->function) {
1075 struct pubname_callback_param pubname_param = {
1076 .function = pp->function,
1077 .file = pp->file,
1078 .cu_die = &pf->cu_die,
1079 .sp_die = &pf->sp_die,
1080 .found = 0,
1081 };
1082 struct dwarf_callback_param probe_param = {
1083 .data = pf,
1084 };
1085
1086 dwarf_getpubnames(self->dbg, pubname_search_cb,
1087 &pubname_param, 0);
1088 if (pubname_param.found) {
1089 ret = probe_point_search_cb(&pf->sp_die, &probe_param);
1090 if (ret)
1091 goto found;
1092 }
1093 }
1094
1095 /* Loop on CUs (Compilation Unit) */
1096 while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
1097 /* Get the DIE(Debugging Information Entry) of this CU */
1098 diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die);
1099 if (!diep)
1100 continue;
1101
1102 /* Check if target file is included. */
1103 if (pp->file)
1104 pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
1105 else
1106 pf->fname = NULL;
1107
1108 if (!pp->file || pf->fname) {
1109 if (pp->function)
1110 ret = find_probe_point_by_func(pf);
1111 else if (pp->lazy_line)
1112 ret = find_probe_point_lazy(NULL, pf);
1113 else {
1114 pf->lno = pp->line;
1115 ret = find_probe_point_by_line(pf);
1116 }
1117 if (ret < 0)
1118 break;
1119 }
1120 off = noff;
1121 }
1122
1123 found:
1124 line_list__free(&pf->lcache);
1125
1126 return ret;
1127 }
1128
1129 /* Add a found probe point into trace event list */
1130 static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
1131 {
1132 struct trace_event_finder *tf =
1133 container_of(pf, struct trace_event_finder, pf);
1134 struct probe_trace_event *tev;
1135 int ret, i;
1136
1137 /* Check number of tevs */
1138 if (tf->ntevs == tf->max_tevs) {
1139 pr_warning("Too many( > %d) probe point found.\n",
1140 tf->max_tevs);
1141 return -ERANGE;
1142 }
1143 tev = &tf->tevs[tf->ntevs++];
1144
1145 /* Trace point should be converted from subprogram DIE */
1146 ret = convert_to_trace_point(&pf->sp_die, pf->addr,
1147 pf->pev->point.retprobe, &tev->point);
1148 if (ret < 0)
1149 return ret;
1150
1151 pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
1152 tev->point.offset);
1153
1154 /* Find each argument */
1155 tev->nargs = pf->pev->nargs;
1156 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1157 if (tev->args == NULL)
1158 return -ENOMEM;
1159 for (i = 0; i < pf->pev->nargs; i++) {
1160 pf->pvar = &pf->pev->args[i];
1161 pf->tvar = &tev->args[i];
1162 /* Variable should be found from scope DIE */
1163 ret = find_variable(sc_die, pf);
1164 if (ret != 0)
1165 return ret;
1166 }
1167
1168 return 0;
1169 }
1170
1171 /* Find probe_trace_events specified by perf_probe_event from debuginfo */
1172 int debuginfo__find_trace_events(struct debuginfo *self,
1173 struct perf_probe_event *pev,
1174 struct probe_trace_event **tevs, int max_tevs)
1175 {
1176 struct trace_event_finder tf = {
1177 .pf = {.pev = pev, .callback = add_probe_trace_event},
1178 .max_tevs = max_tevs};
1179 int ret;
1180
1181 /* Allocate result tevs array */
1182 *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs);
1183 if (*tevs == NULL)
1184 return -ENOMEM;
1185
1186 tf.tevs = *tevs;
1187 tf.ntevs = 0;
1188
1189 ret = debuginfo__find_probes(self, &tf.pf);
1190 if (ret < 0) {
1191 free(*tevs);
1192 *tevs = NULL;
1193 return ret;
1194 }
1195
1196 return (ret < 0) ? ret : tf.ntevs;
1197 }
1198
1199 #define MAX_VAR_LEN 64
1200
1201 /* Collect available variables in this scope */
1202 static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
1203 {
1204 struct available_var_finder *af = data;
1205 struct variable_list *vl;
1206 char buf[MAX_VAR_LEN];
1207 int tag, ret;
1208
1209 vl = &af->vls[af->nvls - 1];
1210
1211 tag = dwarf_tag(die_mem);
1212 if (tag == DW_TAG_formal_parameter ||
1213 tag == DW_TAG_variable) {
1214 ret = convert_variable_location(die_mem, af->pf.addr,
1215 af->pf.fb_ops, NULL);
1216 if (ret == 0) {
1217 ret = die_get_varname(die_mem, buf, MAX_VAR_LEN);
1218 pr_debug2("Add new var: %s\n", buf);
1219 if (ret > 0)
1220 strlist__add(vl->vars, buf);
1221 }
1222 }
1223
1224 if (af->child && dwarf_haspc(die_mem, af->pf.addr))
1225 return DIE_FIND_CB_CONTINUE;
1226 else
1227 return DIE_FIND_CB_SIBLING;
1228 }
1229
1230 /* Add a found vars into available variables list */
1231 static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
1232 {
1233 struct available_var_finder *af =
1234 container_of(pf, struct available_var_finder, pf);
1235 struct variable_list *vl;
1236 Dwarf_Die die_mem;
1237 int ret;
1238
1239 /* Check number of tevs */
1240 if (af->nvls == af->max_vls) {
1241 pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
1242 return -ERANGE;
1243 }
1244 vl = &af->vls[af->nvls++];
1245
1246 /* Trace point should be converted from subprogram DIE */
1247 ret = convert_to_trace_point(&pf->sp_die, pf->addr,
1248 pf->pev->point.retprobe, &vl->point);
1249 if (ret < 0)
1250 return ret;
1251
1252 pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
1253 vl->point.offset);
1254
1255 /* Find local variables */
1256 vl->vars = strlist__new(true, NULL);
1257 if (vl->vars == NULL)
1258 return -ENOMEM;
1259 af->child = true;
1260 die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
1261
1262 /* Find external variables */
1263 if (!af->externs)
1264 goto out;
1265 /* Don't need to search child DIE for externs. */
1266 af->child = false;
1267 die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
1268
1269 out:
1270 if (strlist__empty(vl->vars)) {
1271 strlist__delete(vl->vars);
1272 vl->vars = NULL;
1273 }
1274
1275 return ret;
1276 }
1277
1278 /* Find available variables at given probe point */
1279 int debuginfo__find_available_vars_at(struct debuginfo *self,
1280 struct perf_probe_event *pev,
1281 struct variable_list **vls,
1282 int max_vls, bool externs)
1283 {
1284 struct available_var_finder af = {
1285 .pf = {.pev = pev, .callback = add_available_vars},
1286 .max_vls = max_vls, .externs = externs};
1287 int ret;
1288
1289 /* Allocate result vls array */
1290 *vls = zalloc(sizeof(struct variable_list) * max_vls);
1291 if (*vls == NULL)
1292 return -ENOMEM;
1293
1294 af.vls = *vls;
1295 af.nvls = 0;
1296
1297 ret = debuginfo__find_probes(self, &af.pf);
1298 if (ret < 0) {
1299 /* Free vlist for error */
1300 while (af.nvls--) {
1301 if (af.vls[af.nvls].point.symbol)
1302 free(af.vls[af.nvls].point.symbol);
1303 if (af.vls[af.nvls].vars)
1304 strlist__delete(af.vls[af.nvls].vars);
1305 }
1306 free(af.vls);
1307 *vls = NULL;
1308 return ret;
1309 }
1310
1311 return (ret < 0) ? ret : af.nvls;
1312 }
1313
1314 /* Reverse search */
1315 int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr,
1316 struct perf_probe_point *ppt)
1317 {
1318 Dwarf_Die cudie, spdie, indie;
1319 Dwarf_Addr _addr, baseaddr;
1320 const char *fname = NULL, *func = NULL, *tmp;
1321 int baseline = 0, lineno = 0, ret = 0;
1322
1323 /* Adjust address with bias */
1324 addr += self->bias;
1325
1326 /* Find cu die */
1327 if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) {
1328 pr_warning("Failed to find debug information for address %lx\n",
1329 addr);
1330 ret = -EINVAL;
1331 goto end;
1332 }
1333
1334 /* Find a corresponding line (filename and lineno) */
1335 cu_find_lineinfo(&cudie, addr, &fname, &lineno);
1336 /* Don't care whether it failed or not */
1337
1338 /* Find a corresponding function (name, baseline and baseaddr) */
1339 if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
1340 /* Get function entry information */
1341 tmp = dwarf_diename(&spdie);
1342 if (!tmp ||
1343 dwarf_entrypc(&spdie, &baseaddr) != 0 ||
1344 dwarf_decl_line(&spdie, &baseline) != 0)
1345 goto post;
1346 func = tmp;
1347
1348 if (addr == (unsigned long)baseaddr)
1349 /* Function entry - Relative line number is 0 */
1350 lineno = baseline;
1351 else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr,
1352 &indie)) {
1353 if (dwarf_entrypc(&indie, &_addr) == 0 &&
1354 _addr == addr)
1355 /*
1356 * addr is at an inline function entry.
1357 * In this case, lineno should be the call-site
1358 * line number.
1359 */
1360 lineno = die_get_call_lineno(&indie);
1361 else {
1362 /*
1363 * addr is in an inline function body.
1364 * Since lineno points one of the lines
1365 * of the inline function, baseline should
1366 * be the entry line of the inline function.
1367 */
1368 tmp = dwarf_diename(&indie);
1369 if (tmp &&
1370 dwarf_decl_line(&spdie, &baseline) == 0)
1371 func = tmp;
1372 }
1373 }
1374 }
1375
1376 post:
1377 /* Make a relative line number or an offset */
1378 if (lineno)
1379 ppt->line = lineno - baseline;
1380 else if (func)
1381 ppt->offset = addr - (unsigned long)baseaddr;
1382
1383 /* Duplicate strings */
1384 if (func) {
1385 ppt->function = strdup(func);
1386 if (ppt->function == NULL) {
1387 ret = -ENOMEM;
1388 goto end;
1389 }
1390 }
1391 if (fname) {
1392 ppt->file = strdup(fname);
1393 if (ppt->file == NULL) {
1394 if (ppt->function) {
1395 free(ppt->function);
1396 ppt->function = NULL;
1397 }
1398 ret = -ENOMEM;
1399 goto end;
1400 }
1401 }
1402 end:
1403 if (ret == 0 && (fname || func))
1404 ret = 1; /* Found a point */
1405 return ret;
1406 }
1407
1408 /* Add a line and store the src path */
1409 static int line_range_add_line(const char *src, unsigned int lineno,
1410 struct line_range *lr)
1411 {
1412 /* Copy source path */
1413 if (!lr->path) {
1414 lr->path = strdup(src);
1415 if (lr->path == NULL)
1416 return -ENOMEM;
1417 }
1418 return line_list__add_line(&lr->line_list, lineno);
1419 }
1420
1421 static int line_range_walk_cb(const char *fname, int lineno,
1422 Dwarf_Addr addr __used,
1423 void *data)
1424 {
1425 struct line_finder *lf = data;
1426
1427 if ((strtailcmp(fname, lf->fname) != 0) ||
1428 (lf->lno_s > lineno || lf->lno_e < lineno))
1429 return 0;
1430
1431 if (line_range_add_line(fname, lineno, lf->lr) < 0)
1432 return -EINVAL;
1433
1434 return 0;
1435 }
1436
1437 /* Find line range from its line number */
1438 static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
1439 {
1440 int ret;
1441
1442 ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
1443
1444 /* Update status */
1445 if (ret >= 0)
1446 if (!list_empty(&lf->lr->line_list))
1447 ret = lf->found = 1;
1448 else
1449 ret = 0; /* Lines are not found */
1450 else {
1451 free(lf->lr->path);
1452 lf->lr->path = NULL;
1453 }
1454 return ret;
1455 }
1456
1457 static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
1458 {
1459 find_line_range_by_line(in_die, data);
1460
1461 /*
1462 * We have to check all instances of inlined function, because
1463 * some execution paths can be optimized out depends on the
1464 * function argument of instances
1465 */
1466 return 0;
1467 }
1468
1469 /* Search function from function name */
1470 static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
1471 {
1472 struct dwarf_callback_param *param = data;
1473 struct line_finder *lf = param->data;
1474 struct line_range *lr = lf->lr;
1475
1476 /* Check declared file */
1477 if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
1478 return DWARF_CB_OK;
1479
1480 if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
1481 die_compare_name(sp_die, lr->function)) {
1482 lf->fname = dwarf_decl_file(sp_die);
1483 dwarf_decl_line(sp_die, &lr->offset);
1484 pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
1485 lf->lno_s = lr->offset + lr->start;
1486 if (lf->lno_s < 0) /* Overflow */
1487 lf->lno_s = INT_MAX;
1488 lf->lno_e = lr->offset + lr->end;
1489 if (lf->lno_e < 0) /* Overflow */
1490 lf->lno_e = INT_MAX;
1491 pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
1492 lr->start = lf->lno_s;
1493 lr->end = lf->lno_e;
1494 if (dwarf_func_inline(sp_die))
1495 param->retval = die_walk_instances(sp_die,
1496 line_range_inline_cb, lf);
1497 else
1498 param->retval = find_line_range_by_line(sp_die, lf);
1499 return DWARF_CB_ABORT;
1500 }
1501 return DWARF_CB_OK;
1502 }
1503
1504 static int find_line_range_by_func(struct line_finder *lf)
1505 {
1506 struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
1507 dwarf_getfuncs(&lf->cu_die, line_range_search_cb, &param, 0);
1508 return param.retval;
1509 }
1510
1511 int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr)
1512 {
1513 struct line_finder lf = {.lr = lr, .found = 0};
1514 int ret = 0;
1515 Dwarf_Off off = 0, noff;
1516 size_t cuhl;
1517 Dwarf_Die *diep;
1518 const char *comp_dir;
1519
1520 /* Fastpath: lookup by function name from .debug_pubnames section */
1521 if (lr->function) {
1522 struct pubname_callback_param pubname_param = {
1523 .function = lr->function, .file = lr->file,
1524 .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
1525 struct dwarf_callback_param line_range_param = {
1526 .data = (void *)&lf, .retval = 0};
1527
1528 dwarf_getpubnames(self->dbg, pubname_search_cb,
1529 &pubname_param, 0);
1530 if (pubname_param.found) {
1531 line_range_search_cb(&lf.sp_die, &line_range_param);
1532 if (lf.found)
1533 goto found;
1534 }
1535 }
1536
1537 /* Loop on CUs (Compilation Unit) */
1538 while (!lf.found && ret >= 0) {
1539 if (dwarf_nextcu(self->dbg, off, &noff, &cuhl,
1540 NULL, NULL, NULL) != 0)
1541 break;
1542
1543 /* Get the DIE(Debugging Information Entry) of this CU */
1544 diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die);
1545 if (!diep)
1546 continue;
1547
1548 /* Check if target file is included. */
1549 if (lr->file)
1550 lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
1551 else
1552 lf.fname = 0;
1553
1554 if (!lr->file || lf.fname) {
1555 if (lr->function)
1556 ret = find_line_range_by_func(&lf);
1557 else {
1558 lf.lno_s = lr->start;
1559 lf.lno_e = lr->end;
1560 ret = find_line_range_by_line(NULL, &lf);
1561 }
1562 }
1563 off = noff;
1564 }
1565
1566 found:
1567 /* Store comp_dir */
1568 if (lf.found) {
1569 comp_dir = cu_get_comp_dir(&lf.cu_die);
1570 if (comp_dir) {
1571 lr->comp_dir = strdup(comp_dir);
1572 if (!lr->comp_dir)
1573 ret = -ENOMEM;
1574 }
1575 }
1576
1577 pr_debug("path: %s\n", lr->path);
1578 return (ret < 0) ? ret : lf.found;
1579 }
1580
Linux with added FPC-III support