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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
43#define MAX_BASIC_TYPE_BITS 64
44
45
46
47
48static int line_list__add_line(struct list_head *head, int line)
49{
50 struct line_node *ln;
51 struct list_head *p;
52
53
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)
59 return 1;
60 }
61
62 p = head;
63found:
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
75static int line_list__has_line(struct list_head *head, int line)
76{
77 struct line_node *ln;
78
79
80 list_for_each_entry(ln, head, list)
81 if (ln->line == line)
82 return 1;
83
84 return 0;
85}
86
87
88static void line_list__init(struct list_head *head)
89{
90 INIT_LIST_HEAD(head);
91}
92
93
94static 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
105static char *debuginfo_path;
106
107static 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
114 .find_elf = dwfl_build_id_find_elf,
115};
116
117
118static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
119 const char *path)
120{
121 int fd;
122
123 fd = open(path, O_RDONLY);
124 if (fd < 0)
125 return fd;
126
127 dbg->dwfl = dwfl_begin(&offline_callbacks);
128 if (!dbg->dwfl)
129 goto error;
130
131 dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
132 if (!dbg->mod)
133 goto error;
134
135 dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
136 if (!dbg->dbg)
137 goto error;
138
139 return 0;
140error:
141 if (dbg->dwfl)
142 dwfl_end(dbg->dwfl);
143 else
144 close(fd);
145 memset(dbg, 0, sizeof(*dbg));
146
147 return -ENOENT;
148}
149
150#if _ELFUTILS_PREREQ(0, 148)
151
152static int __linux_kernel_find_elf(Dwfl_Module *mod,
153 void **userdata,
154 const char *module_name,
155 Dwarf_Addr base,
156 char **file_name, Elf **elfp)
157{
158 int fd;
159 const char *path = kernel_get_module_path(module_name);
160
161 pr_debug2("Use file %s for %s\n", path, module_name);
162 if (path) {
163 fd = open(path, O_RDONLY);
164 if (fd >= 0) {
165 *file_name = strdup(path);
166 return fd;
167 }
168 }
169
170 return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base,
171 file_name, elfp);
172}
173
174static const Dwfl_Callbacks kernel_callbacks = {
175 .find_debuginfo = dwfl_standard_find_debuginfo,
176 .debuginfo_path = &debuginfo_path,
177
178 .find_elf = __linux_kernel_find_elf,
179 .section_address = dwfl_linux_kernel_module_section_address,
180};
181
182
183static int debuginfo__init_online_kernel_dwarf(struct debuginfo *dbg,
184 Dwarf_Addr addr)
185{
186 dbg->dwfl = dwfl_begin(&kernel_callbacks);
187 if (!dbg->dwfl)
188 return -EINVAL;
189
190
191 dwfl_linux_kernel_report_kernel(dbg->dwfl);
192 dwfl_linux_kernel_report_modules(dbg->dwfl);
193
194 dbg->dbg = dwfl_addrdwarf(dbg->dwfl, addr, &dbg->bias);
195
196 if (!dbg->dbg) {
197 pr_debug("Failed to find kernel dwarf at %lx\n",
198 (unsigned long)addr);
199 dwfl_end(dbg->dwfl);
200 memset(dbg, 0, sizeof(*dbg));
201 return -ENOENT;
202 }
203
204 return 0;
205}
206#else
207
208static int debuginfo__init_online_kernel_dwarf(struct debuginfo *dbg,
209 Dwarf_Addr addr __maybe_unused)
210{
211 const char *path = kernel_get_module_path("kernel");
212
213 if (!path) {
214 pr_err("Failed to find vmlinux path\n");
215 return -ENOENT;
216 }
217
218 pr_debug2("Use file %s for debuginfo\n", path);
219 return debuginfo__init_offline_dwarf(dbg, path);
220}
221#endif
222
223struct debuginfo *debuginfo__new(const char *path)
224{
225 struct debuginfo *dbg = zalloc(sizeof(*dbg));
226 if (!dbg)
227 return NULL;
228
229 if (debuginfo__init_offline_dwarf(dbg, path) < 0)
230 zfree(&dbg);
231
232 return dbg;
233}
234
235struct debuginfo *debuginfo__new_online_kernel(unsigned long addr)
236{
237 struct debuginfo *dbg = zalloc(sizeof(*dbg));
238
239 if (!dbg)
240 return NULL;
241
242 if (debuginfo__init_online_kernel_dwarf(dbg, (Dwarf_Addr)addr) < 0)
243 zfree(&dbg);
244
245 return dbg;
246}
247
248void debuginfo__delete(struct debuginfo *dbg)
249{
250 if (dbg) {
251 if (dbg->dwfl)
252 dwfl_end(dbg->dwfl);
253 free(dbg);
254 }
255}
256
257
258
259
260
261static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
262{
263 struct probe_trace_arg_ref *ref;
264 ref = zalloc(sizeof(struct probe_trace_arg_ref));
265 if (ref != NULL)
266 ref->offset = offs;
267 return ref;
268}
269
270
271
272
273
274
275
276static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
277 Dwarf_Op *fb_ops, Dwarf_Die *sp_die,
278 struct probe_trace_arg *tvar)
279{
280 Dwarf_Attribute attr;
281 Dwarf_Addr tmp = 0;
282 Dwarf_Op *op;
283 size_t nops;
284 unsigned int regn;
285 Dwarf_Word offs = 0;
286 bool ref = false;
287 const char *regs;
288 int ret;
289
290 if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
291 goto static_var;
292
293
294 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
295 return -EINVAL;
296 if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) {
297 ret = dwarf_entrypc(sp_die, &tmp);
298 if (ret || addr != tmp ||
299 dwarf_tag(vr_die) != DW_TAG_formal_parameter ||
300 dwarf_highpc(sp_die, &tmp))
301 return -ENOENT;
302
303
304
305
306 for (addr += 1; addr <= tmp; addr++) {
307 if (dwarf_getlocation_addr(&attr, addr, &op,
308 &nops, 1) > 0)
309 goto found;
310 }
311 return -ENOENT;
312 }
313found:
314 if (nops == 0)
315
316 return -ENOENT;
317
318 if (op->atom == DW_OP_addr) {
319static_var:
320 if (!tvar)
321 return 0;
322
323 ret = strlen(dwarf_diename(vr_die));
324 tvar->value = zalloc(ret + 2);
325 if (tvar->value == NULL)
326 return -ENOMEM;
327 snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
328 tvar->ref = alloc_trace_arg_ref((long)offs);
329 if (tvar->ref == NULL)
330 return -ENOMEM;
331 return 0;
332 }
333
334
335 if (op->atom == DW_OP_fbreg) {
336 if (fb_ops == NULL)
337 return -ENOTSUP;
338 ref = true;
339 offs = op->number;
340 op = &fb_ops[0];
341 }
342
343 if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
344 regn = op->atom - DW_OP_breg0;
345 offs += op->number;
346 ref = true;
347 } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
348 regn = op->atom - DW_OP_reg0;
349 } else if (op->atom == DW_OP_bregx) {
350 regn = op->number;
351 offs += op->number2;
352 ref = true;
353 } else if (op->atom == DW_OP_regx) {
354 regn = op->number;
355 } else {
356 pr_debug("DW_OP %x is not supported.\n", op->atom);
357 return -ENOTSUP;
358 }
359
360 if (!tvar)
361 return 0;
362
363 regs = get_arch_regstr(regn);
364 if (!regs) {
365
366 pr_warning("Mapping for the register number %u "
367 "missing on this architecture.\n", regn);
368 return -ERANGE;
369 }
370
371 tvar->value = strdup(regs);
372 if (tvar->value == NULL)
373 return -ENOMEM;
374
375 if (ref) {
376 tvar->ref = alloc_trace_arg_ref((long)offs);
377 if (tvar->ref == NULL)
378 return -ENOMEM;
379 }
380 return 0;
381}
382
383#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
384
385static int convert_variable_type(Dwarf_Die *vr_die,
386 struct probe_trace_arg *tvar,
387 const char *cast)
388{
389 struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
390 Dwarf_Die type;
391 char buf[16];
392 int bsize, boffs, total;
393 int ret;
394
395
396 if (cast && strcmp(cast, "string") != 0) {
397
398 tvar->type = strdup(cast);
399 return (tvar->type == NULL) ? -ENOMEM : 0;
400 }
401
402 bsize = dwarf_bitsize(vr_die);
403 if (bsize > 0) {
404
405 boffs = dwarf_bitoffset(vr_die);
406 total = dwarf_bytesize(vr_die);
407 if (boffs < 0 || total < 0)
408 return -ENOENT;
409 ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
410 BYTES_TO_BITS(total));
411 goto formatted;
412 }
413
414 if (die_get_real_type(vr_die, &type) == NULL) {
415 pr_warning("Failed to get a type information of %s.\n",
416 dwarf_diename(vr_die));
417 return -ENOENT;
418 }
419
420 pr_debug("%s type is %s.\n",
421 dwarf_diename(vr_die), dwarf_diename(&type));
422
423 if (cast && strcmp(cast, "string") == 0) {
424 ret = dwarf_tag(&type);
425 if (ret != DW_TAG_pointer_type &&
426 ret != DW_TAG_array_type) {
427 pr_warning("Failed to cast into string: "
428 "%s(%s) is not a pointer nor array.\n",
429 dwarf_diename(vr_die), dwarf_diename(&type));
430 return -EINVAL;
431 }
432 if (die_get_real_type(&type, &type) == NULL) {
433 pr_warning("Failed to get a type"
434 " information.\n");
435 return -ENOENT;
436 }
437 if (ret == DW_TAG_pointer_type) {
438 while (*ref_ptr)
439 ref_ptr = &(*ref_ptr)->next;
440
441 *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
442 if (*ref_ptr == NULL) {
443 pr_warning("Out of memory error\n");
444 return -ENOMEM;
445 }
446 }
447 if (!die_compare_name(&type, "char") &&
448 !die_compare_name(&type, "unsigned char")) {
449 pr_warning("Failed to cast into string: "
450 "%s is not (unsigned) char *.\n",
451 dwarf_diename(vr_die));
452 return -EINVAL;
453 }
454 tvar->type = strdup(cast);
455 return (tvar->type == NULL) ? -ENOMEM : 0;
456 }
457
458 ret = dwarf_bytesize(&type);
459 if (ret <= 0)
460
461 return 0;
462 ret = BYTES_TO_BITS(ret);
463
464
465 if (ret > MAX_BASIC_TYPE_BITS) {
466 pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
467 dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
468 ret = MAX_BASIC_TYPE_BITS;
469 }
470 ret = snprintf(buf, 16, "%c%d",
471 die_is_signed_type(&type) ? 's' : 'u', ret);
472
473formatted:
474 if (ret < 0 || ret >= 16) {
475 if (ret >= 16)
476 ret = -E2BIG;
477 pr_warning("Failed to convert variable type: %s\n",
478 strerror(-ret));
479 return ret;
480 }
481 tvar->type = strdup(buf);
482 if (tvar->type == NULL)
483 return -ENOMEM;
484 return 0;
485}
486
487static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
488 struct perf_probe_arg_field *field,
489 struct probe_trace_arg_ref **ref_ptr,
490 Dwarf_Die *die_mem)
491{
492 struct probe_trace_arg_ref *ref = *ref_ptr;
493 Dwarf_Die type;
494 Dwarf_Word offs;
495 int ret, tag;
496
497 pr_debug("converting %s in %s\n", field->name, varname);
498 if (die_get_real_type(vr_die, &type) == NULL) {
499 pr_warning("Failed to get the type of %s.\n", varname);
500 return -ENOENT;
501 }
502 pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type));
503 tag = dwarf_tag(&type);
504
505 if (field->name[0] == '[' &&
506 (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
507 if (field->next)
508
509 memcpy(die_mem, &type, sizeof(*die_mem));
510
511 if (die_get_real_type(&type, &type) == NULL) {
512 pr_warning("Failed to get the type of %s.\n", varname);
513 return -ENOENT;
514 }
515 pr_debug2("Array real type: (%x)\n",
516 (unsigned)dwarf_dieoffset(&type));
517 if (tag == DW_TAG_pointer_type) {
518 ref = zalloc(sizeof(struct probe_trace_arg_ref));
519 if (ref == NULL)
520 return -ENOMEM;
521 if (*ref_ptr)
522 (*ref_ptr)->next = ref;
523 else
524 *ref_ptr = ref;
525 }
526 ref->offset += dwarf_bytesize(&type) * field->index;
527 if (!field->next)
528
529 memcpy(die_mem, vr_die, sizeof(*die_mem));
530 goto next;
531 } else if (tag == DW_TAG_pointer_type) {
532
533 if (!field->ref) {
534 pr_err("Semantic error: %s must be referred by '->'\n",
535 field->name);
536 return -EINVAL;
537 }
538
539 if (die_get_real_type(&type, &type) == NULL) {
540 pr_warning("Failed to get the type of %s.\n", varname);
541 return -ENOENT;
542 }
543
544 tag = dwarf_tag(&type);
545 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
546 pr_warning("%s is not a data structure nor an union.\n",
547 varname);
548 return -EINVAL;
549 }
550
551 ref = zalloc(sizeof(struct probe_trace_arg_ref));
552 if (ref == NULL)
553 return -ENOMEM;
554 if (*ref_ptr)
555 (*ref_ptr)->next = ref;
556 else
557 *ref_ptr = ref;
558 } else {
559
560 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
561 pr_warning("%s is not a data structure nor an union.\n",
562 varname);
563 return -EINVAL;
564 }
565 if (field->name[0] == '[') {
566 pr_err("Semantic error: %s is not a pointor"
567 " nor array.\n", varname);
568 return -EINVAL;
569 }
570 if (field->ref) {
571 pr_err("Semantic error: %s must be referred by '.'\n",
572 field->name);
573 return -EINVAL;
574 }
575 if (!ref) {
576 pr_warning("Structure on a register is not "
577 "supported yet.\n");
578 return -ENOTSUP;
579 }
580 }
581
582 if (die_find_member(&type, field->name, die_mem) == NULL) {
583 pr_warning("%s(type:%s) has no member %s.\n", varname,
584 dwarf_diename(&type), field->name);
585 return -EINVAL;
586 }
587
588
589 if (tag == DW_TAG_union_type) {
590 offs = 0;
591 } else {
592 ret = die_get_data_member_location(die_mem, &offs);
593 if (ret < 0) {
594 pr_warning("Failed to get the offset of %s.\n",
595 field->name);
596 return ret;
597 }
598 }
599 ref->offset += (long)offs;
600
601next:
602
603 if (field->next)
604 return convert_variable_fields(die_mem, field->name,
605 field->next, &ref, die_mem);
606 else
607 return 0;
608}
609
610
611static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
612{
613 Dwarf_Die die_mem;
614 int ret;
615
616 pr_debug("Converting variable %s into trace event.\n",
617 dwarf_diename(vr_die));
618
619 ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
620 &pf->sp_die, pf->tvar);
621 if (ret == -ENOENT)
622 pr_err("Failed to find the location of %s at this address.\n"
623 " Perhaps, it has been optimized out.\n", pf->pvar->var);
624 else if (ret == -ENOTSUP)
625 pr_err("Sorry, we don't support this variable location yet.\n");
626 else if (pf->pvar->field) {
627 ret = convert_variable_fields(vr_die, pf->pvar->var,
628 pf->pvar->field, &pf->tvar->ref,
629 &die_mem);
630 vr_die = &die_mem;
631 }
632 if (ret == 0)
633 ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
634
635 return ret;
636}
637
638
639static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
640{
641 Dwarf_Die vr_die;
642 char buf[32], *ptr;
643 int ret = 0;
644
645 if (!is_c_varname(pf->pvar->var)) {
646
647 pf->tvar->value = strdup(pf->pvar->var);
648 if (pf->tvar->value == NULL)
649 return -ENOMEM;
650 if (pf->pvar->type) {
651 pf->tvar->type = strdup(pf->pvar->type);
652 if (pf->tvar->type == NULL)
653 return -ENOMEM;
654 }
655 if (pf->pvar->name) {
656 pf->tvar->name = strdup(pf->pvar->name);
657 if (pf->tvar->name == NULL)
658 return -ENOMEM;
659 } else
660 pf->tvar->name = NULL;
661 return 0;
662 }
663
664 if (pf->pvar->name)
665 pf->tvar->name = strdup(pf->pvar->name);
666 else {
667 ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
668 if (ret < 0)
669 return ret;
670 ptr = strchr(buf, ':');
671 if (ptr)
672 *ptr = '_';
673 pf->tvar->name = strdup(buf);
674 }
675 if (pf->tvar->name == NULL)
676 return -ENOMEM;
677
678 pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
679
680 if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
681
682 if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
683 ret = -ENOENT;
684 }
685 if (ret >= 0)
686 ret = convert_variable(&vr_die, pf);
687
688 if (ret < 0)
689 pr_warning("Failed to find '%s' in this function.\n",
690 pf->pvar->var);
691 return ret;
692}
693
694
695static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod,
696 Dwarf_Addr paddr, bool retprobe,
697 struct probe_trace_point *tp)
698{
699 Dwarf_Addr eaddr, highaddr;
700 GElf_Sym sym;
701 const char *symbol;
702
703
704 if (dwarf_entrypc(sp_die, &eaddr) != 0) {
705 pr_warning("Failed to get entry address of %s\n",
706 dwarf_diename(sp_die));
707 return -ENOENT;
708 }
709 if (dwarf_highpc(sp_die, &highaddr) != 0) {
710 pr_warning("Failed to get end address of %s\n",
711 dwarf_diename(sp_die));
712 return -ENOENT;
713 }
714 if (paddr > highaddr) {
715 pr_warning("Offset specified is greater than size of %s\n",
716 dwarf_diename(sp_die));
717 return -EINVAL;
718 }
719
720
721 symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL);
722 if (!symbol) {
723 pr_warning("Failed to find symbol at 0x%lx\n",
724 (unsigned long)paddr);
725 return -ENOENT;
726 }
727 tp->offset = (unsigned long)(paddr - sym.st_value);
728 tp->address = (unsigned long)paddr;
729 tp->symbol = strdup(symbol);
730 if (!tp->symbol)
731 return -ENOMEM;
732
733
734 if (retprobe) {
735 if (eaddr != paddr) {
736 pr_warning("Return probe must be on the head of"
737 " a real function.\n");
738 return -EINVAL;
739 }
740 tp->retprobe = true;
741 }
742
743 return 0;
744}
745
746
747static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
748{
749 Dwarf_Attribute fb_attr;
750 size_t nops;
751 int ret;
752
753 if (!sc_die) {
754 pr_err("Caller must pass a scope DIE. Program error.\n");
755 return -EINVAL;
756 }
757
758
759 if (!die_is_func_def(sc_die)) {
760 if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
761 pr_warning("Failed to find probe point in any "
762 "functions.\n");
763 return -ENOENT;
764 }
765 } else
766 memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
767
768
769 dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
770 ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
771 if (ret <= 0 || nops == 0) {
772 pf->fb_ops = NULL;
773#if _ELFUTILS_PREREQ(0, 142)
774 } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
775 pf->cfi != NULL) {
776 Dwarf_Frame *frame;
777 if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
778 dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
779 pr_warning("Failed to get call frame on 0x%jx\n",
780 (uintmax_t)pf->addr);
781 return -ENOENT;
782 }
783#endif
784 }
785
786
787 ret = pf->callback(sc_die, pf);
788
789
790 pf->fb_ops = NULL;
791
792 return ret;
793}
794
795struct find_scope_param {
796 const char *function;
797 const char *file;
798 int line;
799 int diff;
800 Dwarf_Die *die_mem;
801 bool found;
802};
803
804static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
805{
806 struct find_scope_param *fsp = data;
807 const char *file;
808 int lno;
809
810
811 if (fsp->file) {
812 file = dwarf_decl_file(fn_die);
813 if (!file || strcmp(fsp->file, file) != 0)
814 return 0;
815 }
816
817 if (fsp->function) {
818 if (die_compare_name(fn_die, fsp->function)) {
819 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
820 fsp->found = true;
821 return 1;
822 }
823 } else {
824
825 dwarf_decl_line(fn_die, &lno);
826 if (lno < fsp->line && fsp->diff > fsp->line - lno) {
827
828 fsp->diff = fsp->line - lno;
829 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
830 fsp->found = true;
831 }
832 }
833 return 0;
834}
835
836
837static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
838{
839 struct find_scope_param fsp = {
840 .function = pf->pev->point.function,
841 .file = pf->fname,
842 .line = pf->lno,
843 .diff = INT_MAX,
844 .die_mem = die_mem,
845 .found = false,
846 };
847
848 cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp);
849
850 return fsp.found ? die_mem : NULL;
851}
852
853static int probe_point_line_walker(const char *fname, int lineno,
854 Dwarf_Addr addr, void *data)
855{
856 struct probe_finder *pf = data;
857 Dwarf_Die *sc_die, die_mem;
858 int ret;
859
860 if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
861 return 0;
862
863 pf->addr = addr;
864 sc_die = find_best_scope(pf, &die_mem);
865 if (!sc_die) {
866 pr_warning("Failed to find scope of probe point.\n");
867 return -ENOENT;
868 }
869
870 ret = call_probe_finder(sc_die, pf);
871
872
873 return ret < 0 ? ret : 0;
874}
875
876
877static int find_probe_point_by_line(struct probe_finder *pf)
878{
879 return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
880}
881
882
883static int find_lazy_match_lines(struct list_head *head,
884 const char *fname, const char *pat)
885{
886 FILE *fp;
887 char *line = NULL;
888 size_t line_len;
889 ssize_t len;
890 int count = 0, linenum = 1;
891
892 fp = fopen(fname, "r");
893 if (!fp) {
894 pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
895 return -errno;
896 }
897
898 while ((len = getline(&line, &line_len, fp)) > 0) {
899
900 if (line[len - 1] == '\n')
901 line[len - 1] = '\0';
902
903 if (strlazymatch(line, pat)) {
904 line_list__add_line(head, linenum);
905 count++;
906 }
907 linenum++;
908 }
909
910 if (ferror(fp))
911 count = -errno;
912 free(line);
913 fclose(fp);
914
915 if (count == 0)
916 pr_debug("No matched lines found in %s.\n", fname);
917 return count;
918}
919
920static int probe_point_lazy_walker(const char *fname, int lineno,
921 Dwarf_Addr addr, void *data)
922{
923 struct probe_finder *pf = data;
924 Dwarf_Die *sc_die, die_mem;
925 int ret;
926
927 if (!line_list__has_line(&pf->lcache, lineno) ||
928 strtailcmp(fname, pf->fname) != 0)
929 return 0;
930
931 pr_debug("Probe line found: line:%d addr:0x%llx\n",
932 lineno, (unsigned long long)addr);
933 pf->addr = addr;
934 pf->lno = lineno;
935 sc_die = find_best_scope(pf, &die_mem);
936 if (!sc_die) {
937 pr_warning("Failed to find scope of probe point.\n");
938 return -ENOENT;
939 }
940
941 ret = call_probe_finder(sc_die, pf);
942
943
944
945
946
947 return ret < 0 ? ret : 0;
948}
949
950
951static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
952{
953 int ret = 0;
954
955 if (list_empty(&pf->lcache)) {
956
957 ret = find_lazy_match_lines(&pf->lcache, pf->fname,
958 pf->pev->point.lazy_line);
959 if (ret <= 0)
960 return ret;
961 }
962
963 return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
964}
965
966static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
967{
968 struct probe_finder *pf = data;
969 struct perf_probe_point *pp = &pf->pev->point;
970 Dwarf_Addr addr;
971 int ret;
972
973 if (pp->lazy_line)
974 ret = find_probe_point_lazy(in_die, pf);
975 else {
976
977 if (dwarf_entrypc(in_die, &addr) != 0) {
978 pr_warning("Failed to get entry address of %s.\n",
979 dwarf_diename(in_die));
980 return -ENOENT;
981 }
982 pf->addr = addr;
983 pf->addr += pp->offset;
984 pr_debug("found inline addr: 0x%jx\n",
985 (uintmax_t)pf->addr);
986
987 ret = call_probe_finder(in_die, pf);
988 }
989
990 return ret;
991}
992
993
994struct dwarf_callback_param {
995 void *data;
996 int retval;
997};
998
999
1000static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
1001{
1002 struct dwarf_callback_param *param = data;
1003 struct probe_finder *pf = param->data;
1004 struct perf_probe_point *pp = &pf->pev->point;
1005
1006
1007 if (!die_is_func_def(sp_die) ||
1008 !die_compare_name(sp_die, pp->function))
1009 return DWARF_CB_OK;
1010
1011
1012 if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
1013 return DWARF_CB_OK;
1014
1015 pf->fname = dwarf_decl_file(sp_die);
1016 if (pp->line) {
1017 dwarf_decl_line(sp_die, &pf->lno);
1018 pf->lno += pp->line;
1019 param->retval = find_probe_point_by_line(pf);
1020 } else if (!dwarf_func_inline(sp_die)) {
1021
1022 if (pp->lazy_line)
1023 param->retval = find_probe_point_lazy(sp_die, pf);
1024 else {
1025 if (dwarf_entrypc(sp_die, &pf->addr) != 0) {
1026 pr_warning("Failed to get entry address of "
1027 "%s.\n", dwarf_diename(sp_die));
1028 param->retval = -ENOENT;
1029 return DWARF_CB_ABORT;
1030 }
1031 pf->addr += pp->offset;
1032
1033 param->retval = call_probe_finder(sp_die, pf);
1034 }
1035 } else
1036
1037 param->retval = die_walk_instances(sp_die,
1038 probe_point_inline_cb, (void *)pf);
1039
1040 return DWARF_CB_ABORT;
1041}
1042
1043static int find_probe_point_by_func(struct probe_finder *pf)
1044{
1045 struct dwarf_callback_param _param = {.data = (void *)pf,
1046 .retval = 0};
1047 dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
1048 return _param.retval;
1049}
1050
1051struct pubname_callback_param {
1052 char *function;
1053 char *file;
1054 Dwarf_Die *cu_die;
1055 Dwarf_Die *sp_die;
1056 int found;
1057};
1058
1059static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
1060{
1061 struct pubname_callback_param *param = data;
1062
1063 if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
1064 if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
1065 return DWARF_CB_OK;
1066
1067 if (die_compare_name(param->sp_die, param->function)) {
1068 if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
1069 return DWARF_CB_OK;
1070
1071 if (param->file &&
1072 strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
1073 return DWARF_CB_OK;
1074
1075 param->found = 1;
1076 return DWARF_CB_ABORT;
1077 }
1078 }
1079
1080 return DWARF_CB_OK;
1081}
1082
1083
1084static int debuginfo__find_probes(struct debuginfo *dbg,
1085 struct probe_finder *pf)
1086{
1087 struct perf_probe_point *pp = &pf->pev->point;
1088 Dwarf_Off off, noff;
1089 size_t cuhl;
1090 Dwarf_Die *diep;
1091 int ret = 0;
1092
1093#if _ELFUTILS_PREREQ(0, 142)
1094
1095 pf->cfi = dwarf_getcfi(dbg->dbg);
1096#endif
1097
1098 off = 0;
1099 line_list__init(&pf->lcache);
1100
1101
1102 if (pp->function) {
1103 struct pubname_callback_param pubname_param = {
1104 .function = pp->function,
1105 .file = pp->file,
1106 .cu_die = &pf->cu_die,
1107 .sp_die = &pf->sp_die,
1108 .found = 0,
1109 };
1110 struct dwarf_callback_param probe_param = {
1111 .data = pf,
1112 };
1113
1114 dwarf_getpubnames(dbg->dbg, pubname_search_cb,
1115 &pubname_param, 0);
1116 if (pubname_param.found) {
1117 ret = probe_point_search_cb(&pf->sp_die, &probe_param);
1118 if (ret)
1119 goto found;
1120 }
1121 }
1122
1123
1124 while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
1125
1126 diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die);
1127 if (!diep)
1128 continue;
1129
1130
1131 if (pp->file)
1132 pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
1133 else
1134 pf->fname = NULL;
1135
1136 if (!pp->file || pf->fname) {
1137 if (pp->function)
1138 ret = find_probe_point_by_func(pf);
1139 else if (pp->lazy_line)
1140 ret = find_probe_point_lazy(NULL, pf);
1141 else {
1142 pf->lno = pp->line;
1143 ret = find_probe_point_by_line(pf);
1144 }
1145 if (ret < 0)
1146 break;
1147 }
1148 off = noff;
1149 }
1150
1151found:
1152 line_list__free(&pf->lcache);
1153
1154 return ret;
1155}
1156
1157struct local_vars_finder {
1158 struct probe_finder *pf;
1159 struct perf_probe_arg *args;
1160 int max_args;
1161 int nargs;
1162 int ret;
1163};
1164
1165
1166static int copy_variables_cb(Dwarf_Die *die_mem, void *data)
1167{
1168 struct local_vars_finder *vf = data;
1169 struct probe_finder *pf = vf->pf;
1170 int tag;
1171
1172 tag = dwarf_tag(die_mem);
1173 if (tag == DW_TAG_formal_parameter ||
1174 tag == DW_TAG_variable) {
1175 if (convert_variable_location(die_mem, vf->pf->addr,
1176 vf->pf->fb_ops, &pf->sp_die,
1177 NULL) == 0) {
1178 vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem);
1179 if (vf->args[vf->nargs].var == NULL) {
1180 vf->ret = -ENOMEM;
1181 return DIE_FIND_CB_END;
1182 }
1183 pr_debug(" %s", vf->args[vf->nargs].var);
1184 vf->nargs++;
1185 }
1186 }
1187
1188 if (dwarf_haspc(die_mem, vf->pf->addr))
1189 return DIE_FIND_CB_CONTINUE;
1190 else
1191 return DIE_FIND_CB_SIBLING;
1192}
1193
1194static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf,
1195 struct perf_probe_arg *args)
1196{
1197 Dwarf_Die die_mem;
1198 int i;
1199 int n = 0;
1200 struct local_vars_finder vf = {.pf = pf, .args = args,
1201 .max_args = MAX_PROBE_ARGS, .ret = 0};
1202
1203 for (i = 0; i < pf->pev->nargs; i++) {
1204
1205 if (strcmp(pf->pev->args[i].var, "$vars") == 0) {
1206 pr_debug("Expanding $vars into:");
1207 vf.nargs = n;
1208
1209 die_find_child(sc_die, copy_variables_cb, (void *)&vf,
1210 &die_mem);
1211 pr_debug(" (%d)\n", vf.nargs - n);
1212 if (vf.ret < 0)
1213 return vf.ret;
1214 n = vf.nargs;
1215 } else {
1216
1217 args[n] = pf->pev->args[i];
1218 n++;
1219 }
1220 }
1221 return n;
1222}
1223
1224
1225static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
1226{
1227 struct trace_event_finder *tf =
1228 container_of(pf, struct trace_event_finder, pf);
1229 struct probe_trace_event *tev;
1230 struct perf_probe_arg *args;
1231 int ret, i;
1232
1233
1234 if (tf->ntevs == tf->max_tevs) {
1235 pr_warning("Too many( > %d) probe point found.\n",
1236 tf->max_tevs);
1237 return -ERANGE;
1238 }
1239 tev = &tf->tevs[tf->ntevs++];
1240
1241
1242 ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr,
1243 pf->pev->point.retprobe, &tev->point);
1244 if (ret < 0)
1245 return ret;
1246
1247 pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
1248 tev->point.offset);
1249
1250
1251 args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS);
1252 if (args == NULL)
1253 return -ENOMEM;
1254
1255 ret = expand_probe_args(sc_die, pf, args);
1256 if (ret < 0)
1257 goto end;
1258
1259 tev->nargs = ret;
1260 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1261 if (tev->args == NULL) {
1262 ret = -ENOMEM;
1263 goto end;
1264 }
1265
1266
1267 for (i = 0; i < tev->nargs; i++) {
1268 pf->pvar = &args[i];
1269 pf->tvar = &tev->args[i];
1270
1271 ret = find_variable(sc_die, pf);
1272 if (ret != 0)
1273 break;
1274 }
1275
1276end:
1277 free(args);
1278 return ret;
1279}
1280
1281
1282int debuginfo__find_trace_events(struct debuginfo *dbg,
1283 struct perf_probe_event *pev,
1284 struct probe_trace_event **tevs, int max_tevs)
1285{
1286 struct trace_event_finder tf = {
1287 .pf = {.pev = pev, .callback = add_probe_trace_event},
1288 .mod = dbg->mod, .max_tevs = max_tevs};
1289 int ret;
1290
1291
1292 *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs);
1293 if (*tevs == NULL)
1294 return -ENOMEM;
1295
1296 tf.tevs = *tevs;
1297 tf.ntevs = 0;
1298
1299 ret = debuginfo__find_probes(dbg, &tf.pf);
1300 if (ret < 0) {
1301 zfree(tevs);
1302 return ret;
1303 }
1304
1305 return (ret < 0) ? ret : tf.ntevs;
1306}
1307
1308#define MAX_VAR_LEN 64
1309
1310
1311static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
1312{
1313 struct available_var_finder *af = data;
1314 struct variable_list *vl;
1315 char buf[MAX_VAR_LEN];
1316 int tag, ret;
1317
1318 vl = &af->vls[af->nvls - 1];
1319
1320 tag = dwarf_tag(die_mem);
1321 if (tag == DW_TAG_formal_parameter ||
1322 tag == DW_TAG_variable) {
1323 ret = convert_variable_location(die_mem, af->pf.addr,
1324 af->pf.fb_ops, &af->pf.sp_die,
1325 NULL);
1326 if (ret == 0) {
1327 ret = die_get_varname(die_mem, buf, MAX_VAR_LEN);
1328 pr_debug2("Add new var: %s\n", buf);
1329 if (ret > 0)
1330 strlist__add(vl->vars, buf);
1331 }
1332 }
1333
1334 if (af->child && dwarf_haspc(die_mem, af->pf.addr))
1335 return DIE_FIND_CB_CONTINUE;
1336 else
1337 return DIE_FIND_CB_SIBLING;
1338}
1339
1340
1341static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
1342{
1343 struct available_var_finder *af =
1344 container_of(pf, struct available_var_finder, pf);
1345 struct variable_list *vl;
1346 Dwarf_Die die_mem;
1347 int ret;
1348
1349
1350 if (af->nvls == af->max_vls) {
1351 pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
1352 return -ERANGE;
1353 }
1354 vl = &af->vls[af->nvls++];
1355
1356
1357 ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr,
1358 pf->pev->point.retprobe, &vl->point);
1359 if (ret < 0)
1360 return ret;
1361
1362 pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
1363 vl->point.offset);
1364
1365
1366 vl->vars = strlist__new(true, NULL);
1367 if (vl->vars == NULL)
1368 return -ENOMEM;
1369 af->child = true;
1370 die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
1371
1372
1373 if (!af->externs)
1374 goto out;
1375
1376 af->child = false;
1377 die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
1378
1379out:
1380 if (strlist__empty(vl->vars)) {
1381 strlist__delete(vl->vars);
1382 vl->vars = NULL;
1383 }
1384
1385 return ret;
1386}
1387
1388
1389int debuginfo__find_available_vars_at(struct debuginfo *dbg,
1390 struct perf_probe_event *pev,
1391 struct variable_list **vls,
1392 int max_vls, bool externs)
1393{
1394 struct available_var_finder af = {
1395 .pf = {.pev = pev, .callback = add_available_vars},
1396 .mod = dbg->mod,
1397 .max_vls = max_vls, .externs = externs};
1398 int ret;
1399
1400
1401 *vls = zalloc(sizeof(struct variable_list) * max_vls);
1402 if (*vls == NULL)
1403 return -ENOMEM;
1404
1405 af.vls = *vls;
1406 af.nvls = 0;
1407
1408 ret = debuginfo__find_probes(dbg, &af.pf);
1409 if (ret < 0) {
1410
1411 while (af.nvls--) {
1412 zfree(&af.vls[af.nvls].point.symbol);
1413 strlist__delete(af.vls[af.nvls].vars);
1414 }
1415 zfree(vls);
1416 return ret;
1417 }
1418
1419 return (ret < 0) ? ret : af.nvls;
1420}
1421
1422
1423int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
1424 struct perf_probe_point *ppt)
1425{
1426 Dwarf_Die cudie, spdie, indie;
1427 Dwarf_Addr _addr = 0, baseaddr = 0;
1428 const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
1429 int baseline = 0, lineno = 0, ret = 0;
1430
1431
1432 addr += dbg->bias;
1433
1434
1435 if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr - dbg->bias, &cudie)) {
1436 pr_warning("Failed to find debug information for address %lx\n",
1437 addr);
1438 ret = -EINVAL;
1439 goto end;
1440 }
1441
1442
1443 cu_find_lineinfo(&cudie, addr, &fname, &lineno);
1444
1445
1446
1447 if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
1448
1449 func = basefunc = dwarf_diename(&spdie);
1450 if (!func ||
1451 dwarf_entrypc(&spdie, &baseaddr) != 0 ||
1452 dwarf_decl_line(&spdie, &baseline) != 0) {
1453 lineno = 0;
1454 goto post;
1455 }
1456
1457 fname = dwarf_decl_file(&spdie);
1458 if (addr == (unsigned long)baseaddr) {
1459
1460 lineno = baseline;
1461 goto post;
1462 }
1463
1464
1465 while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr,
1466 &indie)) {
1467
1468 if (dwarf_entrypc(&indie, &_addr) == 0 &&
1469 _addr == addr) {
1470
1471
1472
1473
1474
1475 lineno = die_get_call_lineno(&indie);
1476 fname = die_get_call_file(&indie);
1477 break;
1478 } else {
1479
1480
1481
1482
1483
1484
1485 tmp = dwarf_diename(&indie);
1486 if (!tmp ||
1487 dwarf_decl_line(&indie, &baseline) != 0)
1488 break;
1489 func = tmp;
1490 spdie = indie;
1491 }
1492 }
1493
1494 tmp = dwarf_decl_file(&spdie);
1495 if (!tmp || strcmp(tmp, fname) != 0)
1496 lineno = 0;
1497 }
1498
1499post:
1500
1501 if (lineno)
1502 ppt->line = lineno - baseline;
1503 else if (basefunc) {
1504 ppt->offset = addr - (unsigned long)baseaddr;
1505 func = basefunc;
1506 }
1507
1508
1509 if (func) {
1510 ppt->function = strdup(func);
1511 if (ppt->function == NULL) {
1512 ret = -ENOMEM;
1513 goto end;
1514 }
1515 }
1516 if (fname) {
1517 ppt->file = strdup(fname);
1518 if (ppt->file == NULL) {
1519 zfree(&ppt->function);
1520 ret = -ENOMEM;
1521 goto end;
1522 }
1523 }
1524end:
1525 if (ret == 0 && (fname || func))
1526 ret = 1;
1527 return ret;
1528}
1529
1530
1531static int line_range_add_line(const char *src, unsigned int lineno,
1532 struct line_range *lr)
1533{
1534
1535 if (!lr->path) {
1536 lr->path = strdup(src);
1537 if (lr->path == NULL)
1538 return -ENOMEM;
1539 }
1540 return line_list__add_line(&lr->line_list, lineno);
1541}
1542
1543static int line_range_walk_cb(const char *fname, int lineno,
1544 Dwarf_Addr addr __maybe_unused,
1545 void *data)
1546{
1547 struct line_finder *lf = data;
1548
1549 if ((strtailcmp(fname, lf->fname) != 0) ||
1550 (lf->lno_s > lineno || lf->lno_e < lineno))
1551 return 0;
1552
1553 if (line_range_add_line(fname, lineno, lf->lr) < 0)
1554 return -EINVAL;
1555
1556 return 0;
1557}
1558
1559
1560static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
1561{
1562 int ret;
1563
1564 ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
1565
1566
1567 if (ret >= 0)
1568 if (!list_empty(&lf->lr->line_list))
1569 ret = lf->found = 1;
1570 else
1571 ret = 0;
1572 else {
1573 zfree(&lf->lr->path);
1574 }
1575 return ret;
1576}
1577
1578static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
1579{
1580 find_line_range_by_line(in_die, data);
1581
1582
1583
1584
1585
1586
1587 return 0;
1588}
1589
1590
1591static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
1592{
1593 struct dwarf_callback_param *param = data;
1594 struct line_finder *lf = param->data;
1595 struct line_range *lr = lf->lr;
1596
1597
1598 if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
1599 return DWARF_CB_OK;
1600
1601 if (die_is_func_def(sp_die) &&
1602 die_compare_name(sp_die, lr->function)) {
1603 lf->fname = dwarf_decl_file(sp_die);
1604 dwarf_decl_line(sp_die, &lr->offset);
1605 pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
1606 lf->lno_s = lr->offset + lr->start;
1607 if (lf->lno_s < 0)
1608 lf->lno_s = INT_MAX;
1609 lf->lno_e = lr->offset + lr->end;
1610 if (lf->lno_e < 0)
1611 lf->lno_e = INT_MAX;
1612 pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
1613 lr->start = lf->lno_s;
1614 lr->end = lf->lno_e;
1615 if (dwarf_func_inline(sp_die))
1616 param->retval = die_walk_instances(sp_die,
1617 line_range_inline_cb, lf);
1618 else
1619 param->retval = find_line_range_by_line(sp_die, lf);
1620 return DWARF_CB_ABORT;
1621 }
1622 return DWARF_CB_OK;
1623}
1624
1625static int find_line_range_by_func(struct line_finder *lf)
1626{
1627 struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
1628 dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0);
1629 return param.retval;
1630}
1631
1632int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr)
1633{
1634 struct line_finder lf = {.lr = lr, .found = 0};
1635 int ret = 0;
1636 Dwarf_Off off = 0, noff;
1637 size_t cuhl;
1638 Dwarf_Die *diep;
1639 const char *comp_dir;
1640
1641
1642 if (lr->function) {
1643 struct pubname_callback_param pubname_param = {
1644 .function = lr->function, .file = lr->file,
1645 .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
1646 struct dwarf_callback_param line_range_param = {
1647 .data = (void *)&lf, .retval = 0};
1648
1649 dwarf_getpubnames(dbg->dbg, pubname_search_cb,
1650 &pubname_param, 0);
1651 if (pubname_param.found) {
1652 line_range_search_cb(&lf.sp_die, &line_range_param);
1653 if (lf.found)
1654 goto found;
1655 }
1656 }
1657
1658
1659 while (!lf.found && ret >= 0) {
1660 if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl,
1661 NULL, NULL, NULL) != 0)
1662 break;
1663
1664
1665 diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die);
1666 if (!diep)
1667 continue;
1668
1669
1670 if (lr->file)
1671 lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
1672 else
1673 lf.fname = 0;
1674
1675 if (!lr->file || lf.fname) {
1676 if (lr->function)
1677 ret = find_line_range_by_func(&lf);
1678 else {
1679 lf.lno_s = lr->start;
1680 lf.lno_e = lr->end;
1681 ret = find_line_range_by_line(NULL, &lf);
1682 }
1683 }
1684 off = noff;
1685 }
1686
1687found:
1688
1689 if (lf.found) {
1690 comp_dir = cu_get_comp_dir(&lf.cu_die);
1691 if (comp_dir) {
1692 lr->comp_dir = strdup(comp_dir);
1693 if (!lr->comp_dir)
1694 ret = -ENOMEM;
1695 }
1696 }
1697
1698 pr_debug("path: %s\n", lr->path);
1699 return (ret < 0) ? ret : lf.found;
1700}
1701
1702