1
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3
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5
6
7
8#include <inttypes.h>
9#include <sys/utsname.h>
10#include <sys/types.h>
11#include <sys/stat.h>
12#include <fcntl.h>
13#include <errno.h>
14#include <stdio.h>
15#include <unistd.h>
16#include <stdlib.h>
17#include <string.h>
18#include <stdarg.h>
19#include <dwarf-regs.h>
20
21#include <linux/bitops.h>
22#include <linux/zalloc.h>
23#include "event.h"
24#include "dso.h"
25#include "debug.h"
26#include "intlist.h"
27#include "strlist.h"
28#include "symbol.h"
29#include "probe-finder.h"
30#include "probe-file.h"
31#include "string2.h"
32
33
34#define MAX_BASIC_TYPE_BITS 64
35
36
37static char *debuginfo_path;
38
39static const Dwfl_Callbacks offline_callbacks = {
40 .find_debuginfo = dwfl_standard_find_debuginfo,
41 .debuginfo_path = &debuginfo_path,
42
43 .section_address = dwfl_offline_section_address,
44
45
46 .find_elf = dwfl_build_id_find_elf,
47};
48
49
50static int debuginfo__init_offline_dwarf(struct debuginfo *dbg,
51 const char *path)
52{
53 int fd;
54
55 fd = open(path, O_RDONLY);
56 if (fd < 0)
57 return fd;
58
59 dbg->dwfl = dwfl_begin(&offline_callbacks);
60 if (!dbg->dwfl)
61 goto error;
62
63 dwfl_report_begin(dbg->dwfl);
64 dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd);
65 if (!dbg->mod)
66 goto error;
67
68 dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias);
69 if (!dbg->dbg)
70 goto error;
71
72 dwfl_report_end(dbg->dwfl, NULL, NULL);
73
74 return 0;
75error:
76 if (dbg->dwfl)
77 dwfl_end(dbg->dwfl);
78 else
79 close(fd);
80 memset(dbg, 0, sizeof(*dbg));
81
82 return -ENOENT;
83}
84
85static struct debuginfo *__debuginfo__new(const char *path)
86{
87 struct debuginfo *dbg = zalloc(sizeof(*dbg));
88 if (!dbg)
89 return NULL;
90
91 if (debuginfo__init_offline_dwarf(dbg, path) < 0)
92 zfree(&dbg);
93 if (dbg)
94 pr_debug("Open Debuginfo file: %s\n", path);
95 return dbg;
96}
97
98enum dso_binary_type distro_dwarf_types[] = {
99 DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
100 DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
101 DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
102 DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
103 DSO_BINARY_TYPE__NOT_FOUND,
104};
105
106struct debuginfo *debuginfo__new(const char *path)
107{
108 enum dso_binary_type *type;
109 char buf[PATH_MAX], nil = '\0';
110 struct dso *dso;
111 struct debuginfo *dinfo = NULL;
112
113
114 dso = dso__new(path);
115 if (!dso)
116 goto out;
117
118 for (type = distro_dwarf_types;
119 !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND;
120 type++) {
121 if (dso__read_binary_type_filename(dso, *type, &nil,
122 buf, PATH_MAX) < 0)
123 continue;
124 dinfo = __debuginfo__new(buf);
125 }
126 dso__put(dso);
127
128out:
129
130 return dinfo ? : __debuginfo__new(path);
131}
132
133void debuginfo__delete(struct debuginfo *dbg)
134{
135 if (dbg) {
136 if (dbg->dwfl)
137 dwfl_end(dbg->dwfl);
138 free(dbg);
139 }
140}
141
142
143
144
145
146static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
147{
148 struct probe_trace_arg_ref *ref;
149 ref = zalloc(sizeof(struct probe_trace_arg_ref));
150 if (ref != NULL)
151 ref->offset = offs;
152 return ref;
153}
154
155
156
157
158
159
160
161static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
162 Dwarf_Op *fb_ops, Dwarf_Die *sp_die,
163 unsigned int machine,
164 struct probe_trace_arg *tvar)
165{
166 Dwarf_Attribute attr;
167 Dwarf_Addr tmp = 0;
168 Dwarf_Op *op;
169 size_t nops;
170 unsigned int regn;
171 Dwarf_Word offs = 0;
172 bool ref = false;
173 const char *regs;
174 int ret, ret2 = 0;
175
176 if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL)
177 goto static_var;
178
179
180 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
181 return -EINVAL;
182 if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) {
183 ret = dwarf_entrypc(sp_die, &tmp);
184 if (ret)
185 return -ENOENT;
186
187 if (probe_conf.show_location_range &&
188 (dwarf_tag(vr_die) == DW_TAG_variable)) {
189 ret2 = -ERANGE;
190 } else if (addr != tmp ||
191 dwarf_tag(vr_die) != DW_TAG_formal_parameter) {
192 return -ENOENT;
193 }
194
195 ret = dwarf_highpc(sp_die, &tmp);
196 if (ret)
197 return -ENOENT;
198
199
200
201
202 for (addr += 1; addr <= tmp; addr++) {
203 if (dwarf_getlocation_addr(&attr, addr, &op,
204 &nops, 1) > 0)
205 goto found;
206 }
207 return -ENOENT;
208 }
209found:
210 if (nops == 0)
211
212 return -ENOENT;
213
214 if (op->atom == DW_OP_addr) {
215static_var:
216 if (!tvar)
217 return ret2;
218
219 ret = strlen(dwarf_diename(vr_die));
220 tvar->value = zalloc(ret + 2);
221 if (tvar->value == NULL)
222 return -ENOMEM;
223 snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
224 tvar->ref = alloc_trace_arg_ref((long)offs);
225 if (tvar->ref == NULL)
226 return -ENOMEM;
227 return ret2;
228 }
229
230
231 if (op->atom == DW_OP_fbreg) {
232 if (fb_ops == NULL)
233 return -ENOTSUP;
234 ref = true;
235 offs = op->number;
236 op = &fb_ops[0];
237 }
238
239 if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
240 regn = op->atom - DW_OP_breg0;
241 offs += op->number;
242 ref = true;
243 } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
244 regn = op->atom - DW_OP_reg0;
245 } else if (op->atom == DW_OP_bregx) {
246 regn = op->number;
247 offs += op->number2;
248 ref = true;
249 } else if (op->atom == DW_OP_regx) {
250 regn = op->number;
251 } else {
252 pr_debug("DW_OP %x is not supported.\n", op->atom);
253 return -ENOTSUP;
254 }
255
256 if (!tvar)
257 return ret2;
258
259 regs = get_dwarf_regstr(regn, machine);
260 if (!regs) {
261
262 pr_warning("Mapping for the register number %u "
263 "missing on this architecture.\n", regn);
264 return -ENOTSUP;
265 }
266
267 tvar->value = strdup(regs);
268 if (tvar->value == NULL)
269 return -ENOMEM;
270
271 if (ref) {
272 tvar->ref = alloc_trace_arg_ref((long)offs);
273 if (tvar->ref == NULL)
274 return -ENOMEM;
275 }
276 return ret2;
277}
278
279#define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
280
281static int convert_variable_type(Dwarf_Die *vr_die,
282 struct probe_trace_arg *tvar,
283 const char *cast, bool user_access)
284{
285 struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
286 Dwarf_Die type;
287 char buf[16];
288 char sbuf[STRERR_BUFSIZE];
289 int bsize, boffs, total;
290 int ret;
291 char prefix;
292
293
294 if (cast && strcmp(cast, "string") != 0 && strcmp(cast, "x") != 0 &&
295 strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) {
296
297
298 tvar->type = strdup(cast);
299 return (tvar->type == NULL) ? -ENOMEM : 0;
300 }
301
302 bsize = dwarf_bitsize(vr_die);
303 if (bsize > 0) {
304
305 boffs = dwarf_bitoffset(vr_die);
306 total = dwarf_bytesize(vr_die);
307 if (boffs < 0 || total < 0)
308 return -ENOENT;
309 ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
310 BYTES_TO_BITS(total));
311 goto formatted;
312 }
313
314 if (die_get_real_type(vr_die, &type) == NULL) {
315 pr_warning("Failed to get a type information of %s.\n",
316 dwarf_diename(vr_die));
317 return -ENOENT;
318 }
319
320 pr_debug("%s type is %s.\n",
321 dwarf_diename(vr_die), dwarf_diename(&type));
322
323 if (cast && (!strcmp(cast, "string") || !strcmp(cast, "ustring"))) {
324
325 ret = dwarf_tag(&type);
326 if (ret != DW_TAG_pointer_type &&
327 ret != DW_TAG_array_type) {
328 pr_warning("Failed to cast into string: "
329 "%s(%s) is not a pointer nor array.\n",
330 dwarf_diename(vr_die), dwarf_diename(&type));
331 return -EINVAL;
332 }
333 if (die_get_real_type(&type, &type) == NULL) {
334 pr_warning("Failed to get a type"
335 " information.\n");
336 return -ENOENT;
337 }
338 if (ret == DW_TAG_pointer_type) {
339 while (*ref_ptr)
340 ref_ptr = &(*ref_ptr)->next;
341
342 *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
343 if (*ref_ptr == NULL) {
344 pr_warning("Out of memory error\n");
345 return -ENOMEM;
346 }
347 (*ref_ptr)->user_access = user_access;
348 }
349 if (!die_compare_name(&type, "char") &&
350 !die_compare_name(&type, "unsigned char")) {
351 pr_warning("Failed to cast into string: "
352 "%s is not (unsigned) char *.\n",
353 dwarf_diename(vr_die));
354 return -EINVAL;
355 }
356 tvar->type = strdup(cast);
357 return (tvar->type == NULL) ? -ENOMEM : 0;
358 }
359
360 if (cast && (strcmp(cast, "u") == 0))
361 prefix = 'u';
362 else if (cast && (strcmp(cast, "s") == 0))
363 prefix = 's';
364 else if (cast && (strcmp(cast, "x") == 0) &&
365 probe_type_is_available(PROBE_TYPE_X))
366 prefix = 'x';
367 else
368 prefix = die_is_signed_type(&type) ? 's' :
369 probe_type_is_available(PROBE_TYPE_X) ? 'x' : 'u';
370
371 ret = dwarf_bytesize(&type);
372 if (ret <= 0)
373
374 return 0;
375 ret = BYTES_TO_BITS(ret);
376
377
378 if (ret > MAX_BASIC_TYPE_BITS) {
379 pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
380 dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
381 ret = MAX_BASIC_TYPE_BITS;
382 }
383 ret = snprintf(buf, 16, "%c%d", prefix, ret);
384
385formatted:
386 if (ret < 0 || ret >= 16) {
387 if (ret >= 16)
388 ret = -E2BIG;
389 pr_warning("Failed to convert variable type: %s\n",
390 str_error_r(-ret, sbuf, sizeof(sbuf)));
391 return ret;
392 }
393 tvar->type = strdup(buf);
394 if (tvar->type == NULL)
395 return -ENOMEM;
396 return 0;
397}
398
399static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
400 struct perf_probe_arg_field *field,
401 struct probe_trace_arg_ref **ref_ptr,
402 Dwarf_Die *die_mem, bool user_access)
403{
404 struct probe_trace_arg_ref *ref = *ref_ptr;
405 Dwarf_Die type;
406 Dwarf_Word offs;
407 int ret, tag;
408
409 pr_debug("converting %s in %s\n", field->name, varname);
410 if (die_get_real_type(vr_die, &type) == NULL) {
411 pr_warning("Failed to get the type of %s.\n", varname);
412 return -ENOENT;
413 }
414 pr_debug2("Var real type: %s (%x)\n", dwarf_diename(&type),
415 (unsigned)dwarf_dieoffset(&type));
416 tag = dwarf_tag(&type);
417
418 if (field->name[0] == '[' &&
419 (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
420
421 memcpy(die_mem, &type, sizeof(*die_mem));
422
423 if (die_get_real_type(&type, &type) == NULL) {
424 pr_warning("Failed to get the type of %s.\n", varname);
425 return -ENOENT;
426 }
427 pr_debug2("Array real type: %s (%x)\n", dwarf_diename(&type),
428 (unsigned)dwarf_dieoffset(&type));
429 if (tag == DW_TAG_pointer_type) {
430 ref = zalloc(sizeof(struct probe_trace_arg_ref));
431 if (ref == NULL)
432 return -ENOMEM;
433 if (*ref_ptr)
434 (*ref_ptr)->next = ref;
435 else
436 *ref_ptr = ref;
437 }
438 ref->offset += dwarf_bytesize(&type) * field->index;
439 ref->user_access = user_access;
440 goto next;
441 } else if (tag == DW_TAG_pointer_type) {
442
443 if (!field->ref) {
444 pr_err("Semantic error: %s must be referred by '->'\n",
445 field->name);
446 return -EINVAL;
447 }
448
449 if (die_get_real_type(&type, &type) == NULL) {
450 pr_warning("Failed to get the type of %s.\n", varname);
451 return -ENOENT;
452 }
453
454 tag = dwarf_tag(&type);
455 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
456 pr_warning("%s is not a data structure nor a union.\n",
457 varname);
458 return -EINVAL;
459 }
460
461 ref = zalloc(sizeof(struct probe_trace_arg_ref));
462 if (ref == NULL)
463 return -ENOMEM;
464 if (*ref_ptr)
465 (*ref_ptr)->next = ref;
466 else
467 *ref_ptr = ref;
468 } else {
469
470 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
471 pr_warning("%s is not a data structure nor a union.\n",
472 varname);
473 return -EINVAL;
474 }
475 if (field->name[0] == '[') {
476 pr_err("Semantic error: %s is not a pointer"
477 " nor array.\n", varname);
478 return -EINVAL;
479 }
480
481 if (field->ref && dwarf_diename(vr_die)) {
482 pr_err("Semantic error: %s must be referred by '.'\n",
483 field->name);
484 return -EINVAL;
485 }
486 if (!ref) {
487 pr_warning("Structure on a register is not "
488 "supported yet.\n");
489 return -ENOTSUP;
490 }
491 }
492
493 if (die_find_member(&type, field->name, die_mem) == NULL) {
494 pr_warning("%s(type:%s) has no member %s.\n", varname,
495 dwarf_diename(&type), field->name);
496 return -EINVAL;
497 }
498
499
500 if (tag == DW_TAG_union_type) {
501 offs = 0;
502 } else {
503 ret = die_get_data_member_location(die_mem, &offs);
504 if (ret < 0) {
505 pr_warning("Failed to get the offset of %s.\n",
506 field->name);
507 return ret;
508 }
509 }
510 ref->offset += (long)offs;
511 ref->user_access = user_access;
512
513
514 if (!dwarf_diename(die_mem))
515 return convert_variable_fields(die_mem, varname, field,
516 &ref, die_mem, user_access);
517
518next:
519
520 if (field->next)
521 return convert_variable_fields(die_mem, field->name,
522 field->next, &ref, die_mem, user_access);
523 else
524 return 0;
525}
526
527
528static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
529{
530 Dwarf_Die die_mem;
531 int ret;
532
533 pr_debug("Converting variable %s into trace event.\n",
534 dwarf_diename(vr_die));
535
536 ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
537 &pf->sp_die, pf->machine, pf->tvar);
538 if (ret == -ENOENT || ret == -EINVAL) {
539 pr_err("Failed to find the location of the '%s' variable at this address.\n"
540 " Perhaps it has been optimized out.\n"
541 " Use -V with the --range option to show '%s' location range.\n",
542 pf->pvar->var, pf->pvar->var);
543 } else if (ret == -ENOTSUP)
544 pr_err("Sorry, we don't support this variable location yet.\n");
545 else if (ret == 0 && pf->pvar->field) {
546 ret = convert_variable_fields(vr_die, pf->pvar->var,
547 pf->pvar->field, &pf->tvar->ref,
548 &die_mem, pf->pvar->user_access);
549 vr_die = &die_mem;
550 }
551 if (ret == 0)
552 ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type,
553 pf->pvar->user_access);
554
555 return ret;
556}
557
558
559static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
560{
561 Dwarf_Die vr_die;
562 char *buf, *ptr;
563 int ret = 0;
564
565
566 if (!is_c_varname(pf->pvar->var))
567 return copy_to_probe_trace_arg(pf->tvar, pf->pvar);
568
569 if (pf->pvar->name)
570 pf->tvar->name = strdup(pf->pvar->name);
571 else {
572 buf = synthesize_perf_probe_arg(pf->pvar);
573 if (!buf)
574 return -ENOMEM;
575 ptr = strchr(buf, ':');
576 if (ptr)
577 *ptr = '_';
578 pf->tvar->name = buf;
579 }
580 if (pf->tvar->name == NULL)
581 return -ENOMEM;
582
583 pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
584
585 if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
586
587 if (!die_find_variable_at(&pf->cu_die, pf->pvar->var,
588 0, &vr_die)) {
589 pr_warning("Failed to find '%s' in this function.\n",
590 pf->pvar->var);
591 ret = -ENOENT;
592 }
593 }
594 if (ret >= 0)
595 ret = convert_variable(&vr_die, pf);
596
597 return ret;
598}
599
600
601static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod,
602 Dwarf_Addr paddr, bool retprobe,
603 const char *function,
604 struct probe_trace_point *tp)
605{
606 Dwarf_Addr eaddr, highaddr;
607 GElf_Sym sym;
608 const char *symbol;
609
610
611 if (dwarf_entrypc(sp_die, &eaddr) != 0) {
612 pr_warning("Failed to get entry address of %s\n",
613 dwarf_diename(sp_die));
614 return -ENOENT;
615 }
616 if (dwarf_highpc(sp_die, &highaddr) != 0) {
617 pr_warning("Failed to get end address of %s\n",
618 dwarf_diename(sp_die));
619 return -ENOENT;
620 }
621 if (paddr > highaddr) {
622 pr_warning("Offset specified is greater than size of %s\n",
623 dwarf_diename(sp_die));
624 return -EINVAL;
625 }
626
627 symbol = dwarf_diename(sp_die);
628 if (!symbol) {
629
630 symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL);
631 if (!symbol) {
632 pr_warning("Failed to find symbol at 0x%lx\n",
633 (unsigned long)paddr);
634 return -ENOENT;
635 }
636 eaddr = sym.st_value;
637 }
638 tp->offset = (unsigned long)(paddr - eaddr);
639 tp->address = (unsigned long)paddr;
640 tp->symbol = strdup(symbol);
641 if (!tp->symbol)
642 return -ENOMEM;
643
644
645 if (retprobe) {
646 if (eaddr != paddr) {
647 pr_warning("Failed to find \"%s%%return\",\n"
648 " because %s is an inlined function and"
649 " has no return point.\n", function,
650 function);
651 return -EINVAL;
652 }
653 tp->retprobe = true;
654 }
655
656 return 0;
657}
658
659
660static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
661{
662 Dwarf_Attribute fb_attr;
663 Dwarf_Frame *frame = NULL;
664 size_t nops;
665 int ret;
666
667 if (!sc_die) {
668 pr_err("Caller must pass a scope DIE. Program error.\n");
669 return -EINVAL;
670 }
671
672
673 if (!die_is_func_def(sc_die)) {
674 if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
675 if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
676 pr_warning("Ignoring tail call from %s\n",
677 dwarf_diename(&pf->sp_die));
678 return 0;
679 } else {
680 pr_warning("Failed to find probe point in any "
681 "functions.\n");
682 return -ENOENT;
683 }
684 }
685 } else
686 memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
687
688
689 dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
690 ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
691 if (ret <= 0 || nops == 0) {
692 pf->fb_ops = NULL;
693#if _ELFUTILS_PREREQ(0, 142)
694 } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
695 (pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) {
696 if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 &&
697 (dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) ||
698 dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
699 pr_warning("Failed to get call frame on 0x%jx\n",
700 (uintmax_t)pf->addr);
701 free(frame);
702 return -ENOENT;
703 }
704#endif
705 }
706
707
708 ret = pf->callback(sc_die, pf);
709
710
711 free(frame);
712 pf->fb_ops = NULL;
713
714 return ret;
715}
716
717struct find_scope_param {
718 const char *function;
719 const char *file;
720 int line;
721 int diff;
722 Dwarf_Die *die_mem;
723 bool found;
724};
725
726static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
727{
728 struct find_scope_param *fsp = data;
729 const char *file;
730 int lno;
731
732
733 if (fsp->file) {
734 file = dwarf_decl_file(fn_die);
735 if (!file || strcmp(fsp->file, file) != 0)
736 return 0;
737 }
738
739 if (fsp->function) {
740 if (die_match_name(fn_die, fsp->function)) {
741 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
742 fsp->found = true;
743 return 1;
744 }
745 } else {
746
747 dwarf_decl_line(fn_die, &lno);
748 if (lno < fsp->line && fsp->diff > fsp->line - lno) {
749
750 fsp->diff = fsp->line - lno;
751 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
752 fsp->found = true;
753 }
754 }
755 return 0;
756}
757
758
759static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
760{
761 struct find_scope_param fsp = {
762 .function = pf->pev->point.function,
763 .file = pf->fname,
764 .line = pf->lno,
765 .diff = INT_MAX,
766 .die_mem = die_mem,
767 .found = false,
768 };
769
770 cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp);
771
772 return fsp.found ? die_mem : NULL;
773}
774
775static int probe_point_line_walker(const char *fname, int lineno,
776 Dwarf_Addr addr, void *data)
777{
778 struct probe_finder *pf = data;
779 Dwarf_Die *sc_die, die_mem;
780 int ret;
781
782 if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
783 return 0;
784
785 pf->addr = addr;
786 sc_die = find_best_scope(pf, &die_mem);
787 if (!sc_die) {
788 pr_warning("Failed to find scope of probe point.\n");
789 return -ENOENT;
790 }
791
792 ret = call_probe_finder(sc_die, pf);
793
794
795 return ret < 0 ? ret : 0;
796}
797
798
799static int find_probe_point_by_line(struct probe_finder *pf)
800{
801 return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
802}
803
804
805static int find_lazy_match_lines(struct intlist *list,
806 const char *fname, const char *pat)
807{
808 FILE *fp;
809 char *line = NULL;
810 size_t line_len;
811 ssize_t len;
812 int count = 0, linenum = 1;
813 char sbuf[STRERR_BUFSIZE];
814
815 fp = fopen(fname, "r");
816 if (!fp) {
817 pr_warning("Failed to open %s: %s\n", fname,
818 str_error_r(errno, sbuf, sizeof(sbuf)));
819 return -errno;
820 }
821
822 while ((len = getline(&line, &line_len, fp)) > 0) {
823
824 if (line[len - 1] == '\n')
825 line[len - 1] = '\0';
826
827 if (strlazymatch(line, pat)) {
828 intlist__add(list, linenum);
829 count++;
830 }
831 linenum++;
832 }
833
834 if (ferror(fp))
835 count = -errno;
836 free(line);
837 fclose(fp);
838
839 if (count == 0)
840 pr_debug("No matched lines found in %s.\n", fname);
841 return count;
842}
843
844static int probe_point_lazy_walker(const char *fname, int lineno,
845 Dwarf_Addr addr, void *data)
846{
847 struct probe_finder *pf = data;
848 Dwarf_Die *sc_die, die_mem;
849 int ret;
850
851 if (!intlist__has_entry(pf->lcache, lineno) ||
852 strtailcmp(fname, pf->fname) != 0)
853 return 0;
854
855 pr_debug("Probe line found: line:%d addr:0x%llx\n",
856 lineno, (unsigned long long)addr);
857 pf->addr = addr;
858 pf->lno = lineno;
859 sc_die = find_best_scope(pf, &die_mem);
860 if (!sc_die) {
861 pr_warning("Failed to find scope of probe point.\n");
862 return -ENOENT;
863 }
864
865 ret = call_probe_finder(sc_die, pf);
866
867
868
869
870
871 return ret < 0 ? ret : 0;
872}
873
874
875static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
876{
877 int ret = 0;
878 char *fpath;
879
880 if (intlist__empty(pf->lcache)) {
881 const char *comp_dir;
882
883 comp_dir = cu_get_comp_dir(&pf->cu_die);
884 ret = get_real_path(pf->fname, comp_dir, &fpath);
885 if (ret < 0) {
886 pr_warning("Failed to find source file path.\n");
887 return ret;
888 }
889
890
891 ret = find_lazy_match_lines(pf->lcache, fpath,
892 pf->pev->point.lazy_line);
893 free(fpath);
894 if (ret <= 0)
895 return ret;
896 }
897
898 return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
899}
900
901static void skip_prologue(Dwarf_Die *sp_die, struct probe_finder *pf)
902{
903 struct perf_probe_point *pp = &pf->pev->point;
904
905
906 if (!pf->pev->uprobes)
907 return;
908
909
910 if (die_is_optimized_target(&pf->cu_die))
911 return;
912
913
914 if (!pf->addr)
915 return;
916
917
918 if (!pp->function || pp->line || pp->retprobe || pp->lazy_line ||
919 pp->offset || pp->abs_address)
920 return;
921
922
923 if (!perf_probe_with_var(pf->pev))
924 return;
925
926 pr_info("Target program is compiled without optimization. Skipping prologue.\n"
927 "Probe on address 0x%" PRIx64 " to force probing at the function entry.\n\n",
928 pf->addr);
929
930 die_skip_prologue(sp_die, &pf->cu_die, &pf->addr);
931}
932
933static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
934{
935 struct probe_finder *pf = data;
936 struct perf_probe_point *pp = &pf->pev->point;
937 Dwarf_Addr addr;
938 int ret;
939
940 if (pp->lazy_line)
941 ret = find_probe_point_lazy(in_die, pf);
942 else {
943
944 if (dwarf_entrypc(in_die, &addr) != 0) {
945 pr_warning("Failed to get entry address of %s.\n",
946 dwarf_diename(in_die));
947 return -ENOENT;
948 }
949 if (addr == 0) {
950 pr_debug("%s has no valid entry address. skipped.\n",
951 dwarf_diename(in_die));
952 return -ENOENT;
953 }
954 pf->addr = addr;
955 pf->addr += pp->offset;
956 pr_debug("found inline addr: 0x%jx\n",
957 (uintmax_t)pf->addr);
958
959 ret = call_probe_finder(in_die, pf);
960 }
961
962 return ret;
963}
964
965
966struct dwarf_callback_param {
967 void *data;
968 int retval;
969};
970
971
972static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
973{
974 struct dwarf_callback_param *param = data;
975 struct probe_finder *pf = param->data;
976 struct perf_probe_point *pp = &pf->pev->point;
977
978
979 if (!die_is_func_def(sp_die) ||
980 !die_match_name(sp_die, pp->function))
981 return DWARF_CB_OK;
982
983
984 if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
985 return DWARF_CB_OK;
986
987 pr_debug("Matched function: %s [%lx]\n", dwarf_diename(sp_die),
988 (unsigned long)dwarf_dieoffset(sp_die));
989 pf->fname = dwarf_decl_file(sp_die);
990 if (pp->line) {
991 dwarf_decl_line(sp_die, &pf->lno);
992 pf->lno += pp->line;
993 param->retval = find_probe_point_by_line(pf);
994 } else if (die_is_func_instance(sp_die)) {
995
996 dwarf_entrypc(sp_die, &pf->addr);
997
998 if (pf->addr == 0) {
999 pr_debug("%s has no entry PC. Skipped\n",
1000 dwarf_diename(sp_die));
1001 param->retval = 0;
1002
1003 } else if (pp->lazy_line)
1004 param->retval = find_probe_point_lazy(sp_die, pf);
1005 else {
1006 skip_prologue(sp_die, pf);
1007 pf->addr += pp->offset;
1008
1009 param->retval = call_probe_finder(sp_die, pf);
1010 }
1011 } else if (!probe_conf.no_inlines) {
1012
1013 param->retval = die_walk_instances(sp_die,
1014 probe_point_inline_cb, (void *)pf);
1015
1016 if (param->retval == -ENOENT)
1017 param->retval = 0;
1018 }
1019
1020
1021 if (strisglob(pp->function) && param->retval >= 0) {
1022 param->retval = 0;
1023 return DWARF_CB_OK;
1024 }
1025
1026 return DWARF_CB_ABORT;
1027}
1028
1029static int find_probe_point_by_func(struct probe_finder *pf)
1030{
1031 struct dwarf_callback_param _param = {.data = (void *)pf,
1032 .retval = 0};
1033 dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
1034 return _param.retval;
1035}
1036
1037struct pubname_callback_param {
1038 char *function;
1039 char *file;
1040 Dwarf_Die *cu_die;
1041 Dwarf_Die *sp_die;
1042 int found;
1043};
1044
1045static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
1046{
1047 struct pubname_callback_param *param = data;
1048
1049 if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
1050 if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
1051 return DWARF_CB_OK;
1052
1053 if (die_match_name(param->sp_die, param->function)) {
1054 if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
1055 return DWARF_CB_OK;
1056
1057 if (param->file &&
1058 strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
1059 return DWARF_CB_OK;
1060
1061 param->found = 1;
1062 return DWARF_CB_ABORT;
1063 }
1064 }
1065
1066 return DWARF_CB_OK;
1067}
1068
1069static int debuginfo__find_probe_location(struct debuginfo *dbg,
1070 struct probe_finder *pf)
1071{
1072 struct perf_probe_point *pp = &pf->pev->point;
1073 Dwarf_Off off, noff;
1074 size_t cuhl;
1075 Dwarf_Die *diep;
1076 int ret = 0;
1077
1078 off = 0;
1079 pf->lcache = intlist__new(NULL);
1080 if (!pf->lcache)
1081 return -ENOMEM;
1082
1083
1084 if (pp->function && !strisglob(pp->function)) {
1085 struct pubname_callback_param pubname_param = {
1086 .function = pp->function,
1087 .file = pp->file,
1088 .cu_die = &pf->cu_die,
1089 .sp_die = &pf->sp_die,
1090 .found = 0,
1091 };
1092 struct dwarf_callback_param probe_param = {
1093 .data = pf,
1094 };
1095
1096 dwarf_getpubnames(dbg->dbg, pubname_search_cb,
1097 &pubname_param, 0);
1098 if (pubname_param.found) {
1099 ret = probe_point_search_cb(&pf->sp_die, &probe_param);
1100 if (ret)
1101 goto found;
1102 }
1103 }
1104
1105
1106 while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
1107
1108 diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die);
1109 if (!diep)
1110 continue;
1111
1112
1113 if (pp->file)
1114 pf->fname = cu_find_realpath(&pf->cu_die, pp->file);
1115 else
1116 pf->fname = NULL;
1117
1118 if (!pp->file || pf->fname) {
1119 if (pp->function)
1120 ret = find_probe_point_by_func(pf);
1121 else if (pp->lazy_line)
1122 ret = find_probe_point_lazy(&pf->cu_die, pf);
1123 else {
1124 pf->lno = pp->line;
1125 ret = find_probe_point_by_line(pf);
1126 }
1127 if (ret < 0)
1128 break;
1129 }
1130 off = noff;
1131 }
1132
1133found:
1134 intlist__delete(pf->lcache);
1135 pf->lcache = NULL;
1136
1137 return ret;
1138}
1139
1140
1141static int debuginfo__find_probes(struct debuginfo *dbg,
1142 struct probe_finder *pf)
1143{
1144 int ret = 0;
1145 Elf *elf;
1146 GElf_Ehdr ehdr;
1147
1148 if (pf->cfi_eh || pf->cfi_dbg)
1149 return debuginfo__find_probe_location(dbg, pf);
1150
1151
1152 elf = dwarf_getelf(dbg->dbg);
1153 if (elf == NULL)
1154 return -EINVAL;
1155
1156 if (gelf_getehdr(elf, &ehdr) == NULL)
1157 return -EINVAL;
1158
1159 pf->machine = ehdr.e_machine;
1160
1161#if _ELFUTILS_PREREQ(0, 142)
1162 do {
1163 GElf_Shdr shdr;
1164
1165 if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) &&
1166 shdr.sh_type == SHT_PROGBITS)
1167 pf->cfi_eh = dwarf_getcfi_elf(elf);
1168
1169 pf->cfi_dbg = dwarf_getcfi(dbg->dbg);
1170 } while (0);
1171#endif
1172
1173 ret = debuginfo__find_probe_location(dbg, pf);
1174 return ret;
1175}
1176
1177struct local_vars_finder {
1178 struct probe_finder *pf;
1179 struct perf_probe_arg *args;
1180 bool vars;
1181 int max_args;
1182 int nargs;
1183 int ret;
1184};
1185
1186
1187static int copy_variables_cb(Dwarf_Die *die_mem, void *data)
1188{
1189 struct local_vars_finder *vf = data;
1190 struct probe_finder *pf = vf->pf;
1191 int tag;
1192
1193 tag = dwarf_tag(die_mem);
1194 if (tag == DW_TAG_formal_parameter ||
1195 (tag == DW_TAG_variable && vf->vars)) {
1196 if (convert_variable_location(die_mem, vf->pf->addr,
1197 vf->pf->fb_ops, &pf->sp_die,
1198 pf->machine, NULL) == 0) {
1199 vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem);
1200 if (vf->args[vf->nargs].var == NULL) {
1201 vf->ret = -ENOMEM;
1202 return DIE_FIND_CB_END;
1203 }
1204 pr_debug(" %s", vf->args[vf->nargs].var);
1205 vf->nargs++;
1206 }
1207 }
1208
1209 if (dwarf_haspc(die_mem, vf->pf->addr))
1210 return DIE_FIND_CB_CONTINUE;
1211 else
1212 return DIE_FIND_CB_SIBLING;
1213}
1214
1215static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf,
1216 struct perf_probe_arg *args)
1217{
1218 Dwarf_Die die_mem;
1219 int i;
1220 int n = 0;
1221 struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false,
1222 .max_args = MAX_PROBE_ARGS, .ret = 0};
1223
1224 for (i = 0; i < pf->pev->nargs; i++) {
1225
1226 if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0)
1227 vf.vars = true;
1228 else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) {
1229
1230 args[n] = pf->pev->args[i];
1231 n++;
1232 continue;
1233 }
1234 pr_debug("Expanding %s into:", pf->pev->args[i].var);
1235 vf.nargs = n;
1236
1237 die_find_child(sc_die, copy_variables_cb, (void *)&vf,
1238 &die_mem);
1239 pr_debug(" (%d)\n", vf.nargs - n);
1240 if (vf.ret < 0)
1241 return vf.ret;
1242 n = vf.nargs;
1243 }
1244 return n;
1245}
1246
1247
1248static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
1249{
1250 struct trace_event_finder *tf =
1251 container_of(pf, struct trace_event_finder, pf);
1252 struct perf_probe_point *pp = &pf->pev->point;
1253 struct probe_trace_event *tev;
1254 struct perf_probe_arg *args = NULL;
1255 int ret, i;
1256
1257
1258 if (tf->ntevs == tf->max_tevs) {
1259 pr_warning("Too many( > %d) probe point found.\n",
1260 tf->max_tevs);
1261 return -ERANGE;
1262 }
1263 tev = &tf->tevs[tf->ntevs++];
1264
1265
1266 ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr,
1267 pp->retprobe, pp->function, &tev->point);
1268 if (ret < 0)
1269 goto end;
1270
1271 tev->point.realname = strdup(dwarf_diename(sc_die));
1272 if (!tev->point.realname) {
1273 ret = -ENOMEM;
1274 goto end;
1275 }
1276
1277 pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
1278 tev->point.offset);
1279
1280
1281 args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS);
1282 if (args == NULL) {
1283 ret = -ENOMEM;
1284 goto end;
1285 }
1286
1287 ret = expand_probe_args(sc_die, pf, args);
1288 if (ret < 0)
1289 goto end;
1290
1291 tev->nargs = ret;
1292 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1293 if (tev->args == NULL) {
1294 ret = -ENOMEM;
1295 goto end;
1296 }
1297
1298
1299 for (i = 0; i < tev->nargs; i++) {
1300 pf->pvar = &args[i];
1301 pf->tvar = &tev->args[i];
1302
1303 ret = find_variable(sc_die, pf);
1304 if (ret != 0)
1305 break;
1306 }
1307
1308end:
1309 if (ret) {
1310 clear_probe_trace_event(tev);
1311 tf->ntevs--;
1312 }
1313 free(args);
1314 return ret;
1315}
1316
1317
1318int debuginfo__find_trace_events(struct debuginfo *dbg,
1319 struct perf_probe_event *pev,
1320 struct probe_trace_event **tevs)
1321{
1322 struct trace_event_finder tf = {
1323 .pf = {.pev = pev, .callback = add_probe_trace_event},
1324 .max_tevs = probe_conf.max_probes, .mod = dbg->mod};
1325 int ret, i;
1326
1327
1328 *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs);
1329 if (*tevs == NULL)
1330 return -ENOMEM;
1331
1332 tf.tevs = *tevs;
1333 tf.ntevs = 0;
1334
1335 ret = debuginfo__find_probes(dbg, &tf.pf);
1336 if (ret < 0) {
1337 for (i = 0; i < tf.ntevs; i++)
1338 clear_probe_trace_event(&tf.tevs[i]);
1339 zfree(tevs);
1340 return ret;
1341 }
1342
1343 return (ret < 0) ? ret : tf.ntevs;
1344}
1345
1346
1347static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
1348{
1349 struct available_var_finder *af = data;
1350 struct variable_list *vl;
1351 struct strbuf buf = STRBUF_INIT;
1352 int tag, ret;
1353
1354 vl = &af->vls[af->nvls - 1];
1355
1356 tag = dwarf_tag(die_mem);
1357 if (tag == DW_TAG_formal_parameter ||
1358 tag == DW_TAG_variable) {
1359 ret = convert_variable_location(die_mem, af->pf.addr,
1360 af->pf.fb_ops, &af->pf.sp_die,
1361 af->pf.machine, NULL);
1362 if (ret == 0 || ret == -ERANGE) {
1363 int ret2;
1364 bool externs = !af->child;
1365
1366 if (strbuf_init(&buf, 64) < 0)
1367 goto error;
1368
1369 if (probe_conf.show_location_range) {
1370 if (!externs)
1371 ret2 = strbuf_add(&buf,
1372 ret ? "[INV]\t" : "[VAL]\t", 6);
1373 else
1374 ret2 = strbuf_add(&buf, "[EXT]\t", 6);
1375 if (ret2)
1376 goto error;
1377 }
1378
1379 ret2 = die_get_varname(die_mem, &buf);
1380
1381 if (!ret2 && probe_conf.show_location_range &&
1382 !externs) {
1383 if (strbuf_addch(&buf, '\t') < 0)
1384 goto error;
1385 ret2 = die_get_var_range(&af->pf.sp_die,
1386 die_mem, &buf);
1387 }
1388
1389 pr_debug("Add new var: %s\n", buf.buf);
1390 if (ret2 == 0) {
1391 strlist__add(vl->vars,
1392 strbuf_detach(&buf, NULL));
1393 }
1394 strbuf_release(&buf);
1395 }
1396 }
1397
1398 if (af->child && dwarf_haspc(die_mem, af->pf.addr))
1399 return DIE_FIND_CB_CONTINUE;
1400 else
1401 return DIE_FIND_CB_SIBLING;
1402error:
1403 strbuf_release(&buf);
1404 pr_debug("Error in strbuf\n");
1405 return DIE_FIND_CB_END;
1406}
1407
1408
1409static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
1410{
1411 struct available_var_finder *af =
1412 container_of(pf, struct available_var_finder, pf);
1413 struct perf_probe_point *pp = &pf->pev->point;
1414 struct variable_list *vl;
1415 Dwarf_Die die_mem;
1416 int ret;
1417
1418
1419 if (af->nvls == af->max_vls) {
1420 pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
1421 return -ERANGE;
1422 }
1423 vl = &af->vls[af->nvls++];
1424
1425
1426 ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr,
1427 pp->retprobe, pp->function, &vl->point);
1428 if (ret < 0)
1429 return ret;
1430
1431 pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
1432 vl->point.offset);
1433
1434
1435 vl->vars = strlist__new(NULL, NULL);
1436 if (vl->vars == NULL)
1437 return -ENOMEM;
1438 af->child = true;
1439 die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
1440
1441
1442 if (!probe_conf.show_ext_vars)
1443 goto out;
1444
1445 af->child = false;
1446 die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
1447
1448out:
1449 if (strlist__empty(vl->vars)) {
1450 strlist__delete(vl->vars);
1451 vl->vars = NULL;
1452 }
1453
1454 return ret;
1455}
1456
1457
1458
1459
1460
1461
1462int debuginfo__find_available_vars_at(struct debuginfo *dbg,
1463 struct perf_probe_event *pev,
1464 struct variable_list **vls)
1465{
1466 struct available_var_finder af = {
1467 .pf = {.pev = pev, .callback = add_available_vars},
1468 .mod = dbg->mod,
1469 .max_vls = probe_conf.max_probes};
1470 int ret;
1471
1472
1473 *vls = zalloc(sizeof(struct variable_list) * af.max_vls);
1474 if (*vls == NULL)
1475 return -ENOMEM;
1476
1477 af.vls = *vls;
1478 af.nvls = 0;
1479
1480 ret = debuginfo__find_probes(dbg, &af.pf);
1481 if (ret < 0) {
1482
1483 while (af.nvls--) {
1484 zfree(&af.vls[af.nvls].point.symbol);
1485 strlist__delete(af.vls[af.nvls].vars);
1486 }
1487 zfree(vls);
1488 return ret;
1489 }
1490
1491 return (ret < 0) ? ret : af.nvls;
1492}
1493
1494
1495int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs,
1496 bool adjust_offset)
1497{
1498 int n, i;
1499 Elf32_Word shndx;
1500 Elf_Scn *scn;
1501 Elf *elf;
1502 GElf_Shdr mem, *shdr;
1503 const char *p;
1504
1505 elf = dwfl_module_getelf(dbg->mod, &dbg->bias);
1506 if (!elf)
1507 return -EINVAL;
1508
1509
1510 n = dwfl_module_relocations(dbg->mod);
1511 if (n < 0)
1512 return -ENOENT;
1513
1514 for (i = 0; i < n; i++) {
1515 p = dwfl_module_relocation_info(dbg->mod, i, &shndx);
1516 if (strcmp(p, ".text") == 0) {
1517
1518 scn = elf_getscn(elf, shndx);
1519 if (!scn)
1520 return -ENOENT;
1521 shdr = gelf_getshdr(scn, &mem);
1522 if (!shdr)
1523 return -ENOENT;
1524 *offs = shdr->sh_addr;
1525 if (adjust_offset)
1526 *offs -= shdr->sh_offset;
1527 }
1528 }
1529 return 0;
1530}
1531
1532
1533int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
1534 struct perf_probe_point *ppt)
1535{
1536 Dwarf_Die cudie, spdie, indie;
1537 Dwarf_Addr _addr = 0, baseaddr = 0;
1538 const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
1539 int baseline = 0, lineno = 0, ret = 0;
1540
1541
1542 if (debuginfo__get_text_offset(dbg, &baseaddr, false) == 0)
1543 addr += baseaddr;
1544
1545 if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) {
1546 pr_warning("Failed to find debug information for address %lx\n",
1547 addr);
1548 ret = -EINVAL;
1549 goto end;
1550 }
1551
1552
1553 cu_find_lineinfo(&cudie, addr, &fname, &lineno);
1554
1555
1556
1557 if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
1558
1559 func = basefunc = dwarf_diename(&spdie);
1560 if (!func ||
1561 dwarf_entrypc(&spdie, &baseaddr) != 0 ||
1562 dwarf_decl_line(&spdie, &baseline) != 0) {
1563 lineno = 0;
1564 goto post;
1565 }
1566
1567 fname = dwarf_decl_file(&spdie);
1568 if (addr == (unsigned long)baseaddr) {
1569
1570 lineno = baseline;
1571 goto post;
1572 }
1573
1574
1575 while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr,
1576 &indie)) {
1577
1578 if (dwarf_entrypc(&indie, &_addr) == 0 &&
1579 _addr == addr) {
1580
1581
1582
1583
1584
1585 lineno = die_get_call_lineno(&indie);
1586 fname = die_get_call_file(&indie);
1587 break;
1588 } else {
1589
1590
1591
1592
1593
1594
1595 tmp = dwarf_diename(&indie);
1596 if (!tmp ||
1597 dwarf_decl_line(&indie, &baseline) != 0)
1598 break;
1599 func = tmp;
1600 spdie = indie;
1601 }
1602 }
1603
1604 tmp = dwarf_decl_file(&spdie);
1605 if (!tmp || strcmp(tmp, fname) != 0)
1606 lineno = 0;
1607 }
1608
1609post:
1610
1611 if (lineno)
1612 ppt->line = lineno - baseline;
1613 else if (basefunc) {
1614 ppt->offset = addr - (unsigned long)baseaddr;
1615 func = basefunc;
1616 }
1617
1618
1619 if (func) {
1620 ppt->function = strdup(func);
1621 if (ppt->function == NULL) {
1622 ret = -ENOMEM;
1623 goto end;
1624 }
1625 }
1626 if (fname) {
1627 ppt->file = strdup(fname);
1628 if (ppt->file == NULL) {
1629 zfree(&ppt->function);
1630 ret = -ENOMEM;
1631 goto end;
1632 }
1633 }
1634end:
1635 if (ret == 0 && (fname || func))
1636 ret = 1;
1637 return ret;
1638}
1639
1640
1641static int line_range_add_line(const char *src, unsigned int lineno,
1642 struct line_range *lr)
1643{
1644
1645 if (!lr->path) {
1646 lr->path = strdup(src);
1647 if (lr->path == NULL)
1648 return -ENOMEM;
1649 }
1650 return intlist__add(lr->line_list, lineno);
1651}
1652
1653static int line_range_walk_cb(const char *fname, int lineno,
1654 Dwarf_Addr addr __maybe_unused,
1655 void *data)
1656{
1657 struct line_finder *lf = data;
1658 int err;
1659
1660 if ((strtailcmp(fname, lf->fname) != 0) ||
1661 (lf->lno_s > lineno || lf->lno_e < lineno))
1662 return 0;
1663
1664 err = line_range_add_line(fname, lineno, lf->lr);
1665 if (err < 0 && err != -EEXIST)
1666 return err;
1667
1668 return 0;
1669}
1670
1671
1672static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
1673{
1674 int ret;
1675
1676 ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
1677
1678
1679 if (ret >= 0)
1680 if (!intlist__empty(lf->lr->line_list))
1681 ret = lf->found = 1;
1682 else
1683 ret = 0;
1684 else {
1685 zfree(&lf->lr->path);
1686 }
1687 return ret;
1688}
1689
1690static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
1691{
1692 int ret = find_line_range_by_line(in_die, data);
1693
1694
1695
1696
1697
1698
1699
1700 return ret < 0 ? ret : 0;
1701}
1702
1703
1704static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
1705{
1706 struct dwarf_callback_param *param = data;
1707 struct line_finder *lf = param->data;
1708 struct line_range *lr = lf->lr;
1709
1710
1711 if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
1712 return DWARF_CB_OK;
1713
1714 if (die_is_func_def(sp_die) &&
1715 die_match_name(sp_die, lr->function)) {
1716 lf->fname = dwarf_decl_file(sp_die);
1717 dwarf_decl_line(sp_die, &lr->offset);
1718 pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
1719 lf->lno_s = lr->offset + lr->start;
1720 if (lf->lno_s < 0)
1721 lf->lno_s = INT_MAX;
1722 lf->lno_e = lr->offset + lr->end;
1723 if (lf->lno_e < 0)
1724 lf->lno_e = INT_MAX;
1725 pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
1726 lr->start = lf->lno_s;
1727 lr->end = lf->lno_e;
1728 if (!die_is_func_instance(sp_die))
1729 param->retval = die_walk_instances(sp_die,
1730 line_range_inline_cb, lf);
1731 else
1732 param->retval = find_line_range_by_line(sp_die, lf);
1733 return DWARF_CB_ABORT;
1734 }
1735 return DWARF_CB_OK;
1736}
1737
1738static int find_line_range_by_func(struct line_finder *lf)
1739{
1740 struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
1741 dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0);
1742 return param.retval;
1743}
1744
1745int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr)
1746{
1747 struct line_finder lf = {.lr = lr, .found = 0};
1748 int ret = 0;
1749 Dwarf_Off off = 0, noff;
1750 size_t cuhl;
1751 Dwarf_Die *diep;
1752 const char *comp_dir;
1753
1754
1755 if (lr->function) {
1756 struct pubname_callback_param pubname_param = {
1757 .function = lr->function, .file = lr->file,
1758 .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
1759 struct dwarf_callback_param line_range_param = {
1760 .data = (void *)&lf, .retval = 0};
1761
1762 dwarf_getpubnames(dbg->dbg, pubname_search_cb,
1763 &pubname_param, 0);
1764 if (pubname_param.found) {
1765 line_range_search_cb(&lf.sp_die, &line_range_param);
1766 if (lf.found)
1767 goto found;
1768 }
1769 }
1770
1771
1772 while (!lf.found && ret >= 0) {
1773 if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl,
1774 NULL, NULL, NULL) != 0)
1775 break;
1776
1777
1778 diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die);
1779 if (!diep)
1780 continue;
1781
1782
1783 if (lr->file)
1784 lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
1785 else
1786 lf.fname = 0;
1787
1788 if (!lr->file || lf.fname) {
1789 if (lr->function)
1790 ret = find_line_range_by_func(&lf);
1791 else {
1792 lf.lno_s = lr->start;
1793 lf.lno_e = lr->end;
1794 ret = find_line_range_by_line(NULL, &lf);
1795 }
1796 }
1797 off = noff;
1798 }
1799
1800found:
1801
1802 if (lf.found) {
1803 comp_dir = cu_get_comp_dir(&lf.cu_die);
1804 if (comp_dir) {
1805 lr->comp_dir = strdup(comp_dir);
1806 if (!lr->comp_dir)
1807 ret = -ENOMEM;
1808 }
1809 }
1810
1811 pr_debug("path: %s\n", lr->path);
1812 return (ret < 0) ? ret : lf.found;
1813}
1814
1815
1816
1817
1818
1819
1820
1821int get_real_path(const char *raw_path, const char *comp_dir,
1822 char **new_path)
1823{
1824 const char *prefix = symbol_conf.source_prefix;
1825
1826 if (!prefix) {
1827 if (raw_path[0] != '/' && comp_dir)
1828
1829 prefix = comp_dir;
1830 else {
1831 if (access(raw_path, R_OK) == 0) {
1832 *new_path = strdup(raw_path);
1833 return *new_path ? 0 : -ENOMEM;
1834 } else
1835 return -errno;
1836 }
1837 }
1838
1839 *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
1840 if (!*new_path)
1841 return -ENOMEM;
1842
1843 for (;;) {
1844 sprintf(*new_path, "%s/%s", prefix, raw_path);
1845
1846 if (access(*new_path, R_OK) == 0)
1847 return 0;
1848
1849 if (!symbol_conf.source_prefix) {
1850
1851 zfree(new_path);
1852 return -errno;
1853 }
1854
1855 switch (errno) {
1856 case ENAMETOOLONG:
1857 case ENOENT:
1858 case EROFS:
1859 case EFAULT:
1860 raw_path = strchr(++raw_path, '/');
1861 if (!raw_path) {
1862 zfree(new_path);
1863 return -ENOENT;
1864 }
1865 continue;
1866
1867 default:
1868 zfree(new_path);
1869 return -errno;
1870 }
1871 }
1872}
1873