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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / tools / perf / util / probe-finder.c
blobf0692737ebf1237373a140c0ec76a7a4a7a96f9d
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 int fd;
122
123 fd = open(path, O_RDONLY);
124 if (fd < 0)
125 return fd;
126
127 self->dwfl = dwfl_begin(&offline_callbacks);
128 if (!self->dwfl)
129 goto error;
130
131 self->mod = dwfl_report_offline(self->dwfl, "", "", fd);
132 if (!self->mod)
133 goto error;
134
135 self->dbg = dwfl_module_getdwarf(self->mod, &self->bias);
136 if (!self->dbg)
137 goto error;
138
139 return 0;
140 error:
141 if (self->dwfl)
142 dwfl_end(self->dwfl);
143 else
144 close(fd);
145 memset(self, 0, sizeof(*self));
146
147 return -ENOENT;
148 }
149
150 #if _ELFUTILS_PREREQ(0, 148)
151 /* This method is buggy if elfutils is older than 0.148 */
152 static 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 /* If failed, try to call standard method */
170 return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base,
171 file_name, elfp);
172 }
173
174 static 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 /* Get a Dwarf from live kernel image */
183 static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
184 Dwarf_Addr addr)
185 {
186 self->dwfl = dwfl_begin(&kernel_callbacks);
187 if (!self->dwfl)
188 return -EINVAL;
189
190 /* Load the kernel dwarves: Don't care the result here */
191 dwfl_linux_kernel_report_kernel(self->dwfl);
192 dwfl_linux_kernel_report_modules(self->dwfl);
193
194 self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias);
195 /* Here, check whether we could get a real dwarf */
196 if (!self->dbg) {
197 pr_debug("Failed to find kernel dwarf at %lx\n",
198 (unsigned long)addr);
199 dwfl_end(self->dwfl);
200 memset(self, 0, sizeof(*self));
201 return -ENOENT;
202 }
203
204 return 0;
205 }
206 #else
207 /* With older elfutils, this just support kernel module... */
208 static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self,
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(self, path);
220 }
221 #endif
222
223 struct debuginfo *debuginfo__new(const char *path)
224 {
225 struct debuginfo *self = zalloc(sizeof(struct debuginfo));
226 if (!self)
227 return NULL;
228
229 if (debuginfo__init_offline_dwarf(self, path) < 0) {
230 free(self);
231 self = NULL;
232 }
233
234 return self;
235 }
236
237 struct debuginfo *debuginfo__new_online_kernel(unsigned long addr)
238 {
239 struct debuginfo *self = zalloc(sizeof(struct debuginfo));
240 if (!self)
241 return NULL;
242
243 if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) {
244 free(self);
245 self = NULL;
246 }
247
248 return self;
249 }
250
251 void debuginfo__delete(struct debuginfo *self)
252 {
253 if (self) {
254 if (self->dwfl)
255 dwfl_end(self->dwfl);
256 free(self);
257 }
258 }
259
260 /*
261 * Probe finder related functions
262 */
263
264 static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
265 {
266 struct probe_trace_arg_ref *ref;
267 ref = zalloc(sizeof(struct probe_trace_arg_ref));
268 if (ref != NULL)
269 ref->offset = offs;
270 return ref;
271 }
272
273 /*
274 * Convert a location into trace_arg.
275 * If tvar == NULL, this just checks variable can be converted.
276 */
277 static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
278 Dwarf_Op *fb_ops,
279 struct probe_trace_arg *tvar)
280 {
281 Dwarf_Attribute attr;
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 /* TODO: handle more than 1 exprs */
294 if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL ||
295 dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 ||
296 nops == 0) {
297 /* TODO: Support const_value */
298 return -ENOENT;
299 }
300
301 if (op->atom == DW_OP_addr) {
302 static_var:
303 if (!tvar)
304 return 0;
305 /* Static variables on memory (not stack), make @varname */
306 ret = strlen(dwarf_diename(vr_die));
307 tvar->value = zalloc(ret + 2);
308 if (tvar->value == NULL)
309 return -ENOMEM;
310 snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die));
311 tvar->ref = alloc_trace_arg_ref((long)offs);
312 if (tvar->ref == NULL)
313 return -ENOMEM;
314 return 0;
315 }
316
317 /* If this is based on frame buffer, set the offset */
318 if (op->atom == DW_OP_fbreg) {
319 if (fb_ops == NULL)
320 return -ENOTSUP;
321 ref = true;
322 offs = op->number;
323 op = &fb_ops[0];
324 }
325
326 if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) {
327 regn = op->atom - DW_OP_breg0;
328 offs += op->number;
329 ref = true;
330 } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) {
331 regn = op->atom - DW_OP_reg0;
332 } else if (op->atom == DW_OP_bregx) {
333 regn = op->number;
334 offs += op->number2;
335 ref = true;
336 } else if (op->atom == DW_OP_regx) {
337 regn = op->number;
338 } else {
339 pr_debug("DW_OP %x is not supported.\n", op->atom);
340 return -ENOTSUP;
341 }
342
343 if (!tvar)
344 return 0;
345
346 regs = get_arch_regstr(regn);
347 if (!regs) {
348 /* This should be a bug in DWARF or this tool */
349 pr_warning("Mapping for the register number %u "
350 "missing on this architecture.\n", regn);
351 return -ERANGE;
352 }
353
354 tvar->value = strdup(regs);
355 if (tvar->value == NULL)
356 return -ENOMEM;
357
358 if (ref) {
359 tvar->ref = alloc_trace_arg_ref((long)offs);
360 if (tvar->ref == NULL)
361 return -ENOMEM;
362 }
363 return 0;
364 }
365
366 #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long))
367
368 static int convert_variable_type(Dwarf_Die *vr_die,
369 struct probe_trace_arg *tvar,
370 const char *cast)
371 {
372 struct probe_trace_arg_ref **ref_ptr = &tvar->ref;
373 Dwarf_Die type;
374 char buf[16];
375 int bsize, boffs, total;
376 int ret;
377
378 /* TODO: check all types */
379 if (cast && strcmp(cast, "string") != 0) {
380 /* Non string type is OK */
381 tvar->type = strdup(cast);
382 return (tvar->type == NULL) ? -ENOMEM : 0;
383 }
384
385 bsize = dwarf_bitsize(vr_die);
386 if (bsize > 0) {
387 /* This is a bitfield */
388 boffs = dwarf_bitoffset(vr_die);
389 total = dwarf_bytesize(vr_die);
390 if (boffs < 0 || total < 0)
391 return -ENOENT;
392 ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs,
393 BYTES_TO_BITS(total));
394 goto formatted;
395 }
396
397 if (die_get_real_type(vr_die, &type) == NULL) {
398 pr_warning("Failed to get a type information of %s.\n",
399 dwarf_diename(vr_die));
400 return -ENOENT;
401 }
402
403 pr_debug("%s type is %s.\n",
404 dwarf_diename(vr_die), dwarf_diename(&type));
405
406 if (cast && strcmp(cast, "string") == 0) { /* String type */
407 ret = dwarf_tag(&type);
408 if (ret != DW_TAG_pointer_type &&
409 ret != DW_TAG_array_type) {
410 pr_warning("Failed to cast into string: "
411 "%s(%s) is not a pointer nor array.\n",
412 dwarf_diename(vr_die), dwarf_diename(&type));
413 return -EINVAL;
414 }
415 if (die_get_real_type(&type, &type) == NULL) {
416 pr_warning("Failed to get a type"
417 " information.\n");
418 return -ENOENT;
419 }
420 if (ret == DW_TAG_pointer_type) {
421 while (*ref_ptr)
422 ref_ptr = &(*ref_ptr)->next;
423 /* Add new reference with offset +0 */
424 *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref));
425 if (*ref_ptr == NULL) {
426 pr_warning("Out of memory error\n");
427 return -ENOMEM;
428 }
429 }
430 if (!die_compare_name(&type, "char") &&
431 !die_compare_name(&type, "unsigned char")) {
432 pr_warning("Failed to cast into string: "
433 "%s is not (unsigned) char *.\n",
434 dwarf_diename(vr_die));
435 return -EINVAL;
436 }
437 tvar->type = strdup(cast);
438 return (tvar->type == NULL) ? -ENOMEM : 0;
439 }
440
441 ret = dwarf_bytesize(&type);
442 if (ret <= 0)
443 /* No size ... try to use default type */
444 return 0;
445 ret = BYTES_TO_BITS(ret);
446
447 /* Check the bitwidth */
448 if (ret > MAX_BASIC_TYPE_BITS) {
449 pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n",
450 dwarf_diename(&type), MAX_BASIC_TYPE_BITS);
451 ret = MAX_BASIC_TYPE_BITS;
452 }
453 ret = snprintf(buf, 16, "%c%d",
454 die_is_signed_type(&type) ? 's' : 'u', ret);
455
456 formatted:
457 if (ret < 0 || ret >= 16) {
458 if (ret >= 16)
459 ret = -E2BIG;
460 pr_warning("Failed to convert variable type: %s\n",
461 strerror(-ret));
462 return ret;
463 }
464 tvar->type = strdup(buf);
465 if (tvar->type == NULL)
466 return -ENOMEM;
467 return 0;
468 }
469
470 static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
471 struct perf_probe_arg_field *field,
472 struct probe_trace_arg_ref **ref_ptr,
473 Dwarf_Die *die_mem)
474 {
475 struct probe_trace_arg_ref *ref = *ref_ptr;
476 Dwarf_Die type;
477 Dwarf_Word offs;
478 int ret, tag;
479
480 pr_debug("converting %s in %s\n", field->name, varname);
481 if (die_get_real_type(vr_die, &type) == NULL) {
482 pr_warning("Failed to get the type of %s.\n", varname);
483 return -ENOENT;
484 }
485 pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type));
486 tag = dwarf_tag(&type);
487
488 if (field->name[0] == '[' &&
489 (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) {
490 if (field->next)
491 /* Save original type for next field */
492 memcpy(die_mem, &type, sizeof(*die_mem));
493 /* Get the type of this array */
494 if (die_get_real_type(&type, &type) == NULL) {
495 pr_warning("Failed to get the type of %s.\n", varname);
496 return -ENOENT;
497 }
498 pr_debug2("Array real type: (%x)\n",
499 (unsigned)dwarf_dieoffset(&type));
500 if (tag == DW_TAG_pointer_type) {
501 ref = zalloc(sizeof(struct probe_trace_arg_ref));
502 if (ref == NULL)
503 return -ENOMEM;
504 if (*ref_ptr)
505 (*ref_ptr)->next = ref;
506 else
507 *ref_ptr = ref;
508 }
509 ref->offset += dwarf_bytesize(&type) * field->index;
510 if (!field->next)
511 /* Save vr_die for converting types */
512 memcpy(die_mem, vr_die, sizeof(*die_mem));
513 goto next;
514 } else if (tag == DW_TAG_pointer_type) {
515 /* Check the pointer and dereference */
516 if (!field->ref) {
517 pr_err("Semantic error: %s must be referred by '->'\n",
518 field->name);
519 return -EINVAL;
520 }
521 /* Get the type pointed by this pointer */
522 if (die_get_real_type(&type, &type) == NULL) {
523 pr_warning("Failed to get the type of %s.\n", varname);
524 return -ENOENT;
525 }
526 /* Verify it is a data structure */
527 tag = dwarf_tag(&type);
528 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
529 pr_warning("%s is not a data structure nor an union.\n",
530 varname);
531 return -EINVAL;
532 }
533
534 ref = zalloc(sizeof(struct probe_trace_arg_ref));
535 if (ref == NULL)
536 return -ENOMEM;
537 if (*ref_ptr)
538 (*ref_ptr)->next = ref;
539 else
540 *ref_ptr = ref;
541 } else {
542 /* Verify it is a data structure */
543 if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) {
544 pr_warning("%s is not a data structure nor an union.\n",
545 varname);
546 return -EINVAL;
547 }
548 if (field->name[0] == '[') {
549 pr_err("Semantic error: %s is not a pointor"
550 " nor array.\n", varname);
551 return -EINVAL;
552 }
553 if (field->ref) {
554 pr_err("Semantic error: %s must be referred by '.'\n",
555 field->name);
556 return -EINVAL;
557 }
558 if (!ref) {
559 pr_warning("Structure on a register is not "
560 "supported yet.\n");
561 return -ENOTSUP;
562 }
563 }
564
565 if (die_find_member(&type, field->name, die_mem) == NULL) {
566 pr_warning("%s(tyep:%s) has no member %s.\n", varname,
567 dwarf_diename(&type), field->name);
568 return -EINVAL;
569 }
570
571 /* Get the offset of the field */
572 if (tag == DW_TAG_union_type) {
573 offs = 0;
574 } else {
575 ret = die_get_data_member_location(die_mem, &offs);
576 if (ret < 0) {
577 pr_warning("Failed to get the offset of %s.\n",
578 field->name);
579 return ret;
580 }
581 }
582 ref->offset += (long)offs;
583
584 next:
585 /* Converting next field */
586 if (field->next)
587 return convert_variable_fields(die_mem, field->name,
588 field->next, &ref, die_mem);
589 else
590 return 0;
591 }
592
593 /* Show a variables in kprobe event format */
594 static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
595 {
596 Dwarf_Die die_mem;
597 int ret;
598
599 pr_debug("Converting variable %s into trace event.\n",
600 dwarf_diename(vr_die));
601
602 ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
603 pf->tvar);
604 if (ret == -ENOENT)
605 pr_err("Failed to find the location of %s at this address.\n"
606 " Perhaps, it has been optimized out.\n", pf->pvar->var);
607 else if (ret == -ENOTSUP)
608 pr_err("Sorry, we don't support this variable location yet.\n");
609 else if (pf->pvar->field) {
610 ret = convert_variable_fields(vr_die, pf->pvar->var,
611 pf->pvar->field, &pf->tvar->ref,
612 &die_mem);
613 vr_die = &die_mem;
614 }
615 if (ret == 0)
616 ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
617 /* *expr will be cached in libdw. Don't free it. */
618 return ret;
619 }
620
621 /* Find a variable in a scope DIE */
622 static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
623 {
624 Dwarf_Die vr_die;
625 char buf[32], *ptr;
626 int ret = 0;
627
628 if (!is_c_varname(pf->pvar->var)) {
629 /* Copy raw parameters */
630 pf->tvar->value = strdup(pf->pvar->var);
631 if (pf->tvar->value == NULL)
632 return -ENOMEM;
633 if (pf->pvar->type) {
634 pf->tvar->type = strdup(pf->pvar->type);
635 if (pf->tvar->type == NULL)
636 return -ENOMEM;
637 }
638 if (pf->pvar->name) {
639 pf->tvar->name = strdup(pf->pvar->name);
640 if (pf->tvar->name == NULL)
641 return -ENOMEM;
642 } else
643 pf->tvar->name = NULL;
644 return 0;
645 }
646
647 if (pf->pvar->name)
648 pf->tvar->name = strdup(pf->pvar->name);
649 else {
650 ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
651 if (ret < 0)
652 return ret;
653 ptr = strchr(buf, ':'); /* Change type separator to _ */
654 if (ptr)
655 *ptr = '_';
656 pf->tvar->name = strdup(buf);
657 }
658 if (pf->tvar->name == NULL)
659 return -ENOMEM;
660
661 pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
662 /* Search child die for local variables and parameters. */
663 if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
664 /* Search again in global variables */
665 if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
666 ret = -ENOENT;
667 }
668 if (ret >= 0)
669 ret = convert_variable(&vr_die, pf);
670
671 if (ret < 0)
672 pr_warning("Failed to find '%s' in this function.\n",
673 pf->pvar->var);
674 return ret;
675 }
676
677 /* Convert subprogram DIE to trace point */
678 static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod,
679 Dwarf_Addr paddr, bool retprobe,
680 struct probe_trace_point *tp)
681 {
682 Dwarf_Addr eaddr, highaddr;
683 GElf_Sym sym;
684 const char *symbol;
685
686 /* Verify the address is correct */
687 if (dwarf_entrypc(sp_die, &eaddr) != 0) {
688 pr_warning("Failed to get entry address of %s\n",
689 dwarf_diename(sp_die));
690 return -ENOENT;
691 }
692 if (dwarf_highpc(sp_die, &highaddr) != 0) {
693 pr_warning("Failed to get end address of %s\n",
694 dwarf_diename(sp_die));
695 return -ENOENT;
696 }
697 if (paddr > highaddr) {
698 pr_warning("Offset specified is greater than size of %s\n",
699 dwarf_diename(sp_die));
700 return -EINVAL;
701 }
702
703 /* Get an appropriate symbol from symtab */
704 symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL);
705 if (!symbol) {
706 pr_warning("Failed to find symbol at 0x%lx\n",
707 (unsigned long)paddr);
708 return -ENOENT;
709 }
710 tp->offset = (unsigned long)(paddr - sym.st_value);
711 tp->symbol = strdup(symbol);
712 if (!tp->symbol)
713 return -ENOMEM;
714
715 /* Return probe must be on the head of a subprogram */
716 if (retprobe) {
717 if (eaddr != paddr) {
718 pr_warning("Return probe must be on the head of"
719 " a real function.\n");
720 return -EINVAL;
721 }
722 tp->retprobe = true;
723 }
724
725 return 0;
726 }
727
728 /* Call probe_finder callback with scope DIE */
729 static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
730 {
731 Dwarf_Attribute fb_attr;
732 size_t nops;
733 int ret;
734
735 if (!sc_die) {
736 pr_err("Caller must pass a scope DIE. Program error.\n");
737 return -EINVAL;
738 }
739
740 /* If not a real subprogram, find a real one */
741 if (!die_is_func_def(sc_die)) {
742 if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) {
743 pr_warning("Failed to find probe point in any "
744 "functions.\n");
745 return -ENOENT;
746 }
747 } else
748 memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die));
749
750 /* Get the frame base attribute/ops from subprogram */
751 dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr);
752 ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
753 if (ret <= 0 || nops == 0) {
754 pf->fb_ops = NULL;
755 #if _ELFUTILS_PREREQ(0, 142)
756 } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
757 pf->cfi != NULL) {
758 Dwarf_Frame *frame;
759 if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
760 dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
761 pr_warning("Failed to get call frame on 0x%jx\n",
762 (uintmax_t)pf->addr);
763 return -ENOENT;
764 }
765 #endif
766 }
767
768 /* Call finder's callback handler */
769 ret = pf->callback(sc_die, pf);
770
771 /* *pf->fb_ops will be cached in libdw. Don't free it. */
772 pf->fb_ops = NULL;
773
774 return ret;
775 }
776
777 struct find_scope_param {
778 const char *function;
779 const char *file;
780 int line;
781 int diff;
782 Dwarf_Die *die_mem;
783 bool found;
784 };
785
786 static int find_best_scope_cb(Dwarf_Die *fn_die, void *data)
787 {
788 struct find_scope_param *fsp = data;
789 const char *file;
790 int lno;
791
792 /* Skip if declared file name does not match */
793 if (fsp->file) {
794 file = dwarf_decl_file(fn_die);
795 if (!file || strcmp(fsp->file, file) != 0)
796 return 0;
797 }
798 /* If the function name is given, that's what user expects */
799 if (fsp->function) {
800 if (die_compare_name(fn_die, fsp->function)) {
801 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
802 fsp->found = true;
803 return 1;
804 }
805 } else {
806 /* With the line number, find the nearest declared DIE */
807 dwarf_decl_line(fn_die, &lno);
808 if (lno < fsp->line && fsp->diff > fsp->line - lno) {
809 /* Keep a candidate and continue */
810 fsp->diff = fsp->line - lno;
811 memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die));
812 fsp->found = true;
813 }
814 }
815 return 0;
816 }
817
818 /* Find an appropriate scope fits to given conditions */
819 static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem)
820 {
821 struct find_scope_param fsp = {
822 .function = pf->pev->point.function,
823 .file = pf->fname,
824 .line = pf->lno,
825 .diff = INT_MAX,
826 .die_mem = die_mem,
827 .found = false,
828 };
829
830 cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp);
831
832 return fsp.found ? die_mem : NULL;
833 }
834
835 static int probe_point_line_walker(const char *fname, int lineno,
836 Dwarf_Addr addr, void *data)
837 {
838 struct probe_finder *pf = data;
839 Dwarf_Die *sc_die, die_mem;
840 int ret;
841
842 if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0)
843 return 0;
844
845 pf->addr = addr;
846 sc_die = find_best_scope(pf, &die_mem);
847 if (!sc_die) {
848 pr_warning("Failed to find scope of probe point.\n");
849 return -ENOENT;
850 }
851
852 ret = call_probe_finder(sc_die, pf);
853
854 /* Continue if no error, because the line will be in inline function */
855 return ret < 0 ? ret : 0;
856 }
857
858 /* Find probe point from its line number */
859 static int find_probe_point_by_line(struct probe_finder *pf)
860 {
861 return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf);
862 }
863
864 /* Find lines which match lazy pattern */
865 static int find_lazy_match_lines(struct list_head *head,
866 const char *fname, const char *pat)
867 {
868 FILE *fp;
869 char *line = NULL;
870 size_t line_len;
871 ssize_t len;
872 int count = 0, linenum = 1;
873
874 fp = fopen(fname, "r");
875 if (!fp) {
876 pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
877 return -errno;
878 }
879
880 while ((len = getline(&line, &line_len, fp)) > 0) {
881
882 if (line[len - 1] == '\n')
883 line[len - 1] = '\0';
884
885 if (strlazymatch(line, pat)) {
886 line_list__add_line(head, linenum);
887 count++;
888 }
889 linenum++;
890 }
891
892 if (ferror(fp))
893 count = -errno;
894 free(line);
895 fclose(fp);
896
897 if (count == 0)
898 pr_debug("No matched lines found in %s.\n", fname);
899 return count;
900 }
901
902 static int probe_point_lazy_walker(const char *fname, int lineno,
903 Dwarf_Addr addr, void *data)
904 {
905 struct probe_finder *pf = data;
906 Dwarf_Die *sc_die, die_mem;
907 int ret;
908
909 if (!line_list__has_line(&pf->lcache, lineno) ||
910 strtailcmp(fname, pf->fname) != 0)
911 return 0;
912
913 pr_debug("Probe line found: line:%d addr:0x%llx\n",
914 lineno, (unsigned long long)addr);
915 pf->addr = addr;
916 pf->lno = lineno;
917 sc_die = find_best_scope(pf, &die_mem);
918 if (!sc_die) {
919 pr_warning("Failed to find scope of probe point.\n");
920 return -ENOENT;
921 }
922
923 ret = call_probe_finder(sc_die, pf);
924
925 /*
926 * Continue if no error, because the lazy pattern will match
927 * to other lines
928 */
929 return ret < 0 ? ret : 0;
930 }
931
932 /* Find probe points from lazy pattern */
933 static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
934 {
935 int ret = 0;
936
937 if (list_empty(&pf->lcache)) {
938 /* Matching lazy line pattern */
939 ret = find_lazy_match_lines(&pf->lcache, pf->fname,
940 pf->pev->point.lazy_line);
941 if (ret <= 0)
942 return ret;
943 }
944
945 return die_walk_lines(sp_die, probe_point_lazy_walker, pf);
946 }
947
948 static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
949 {
950 struct probe_finder *pf = data;
951 struct perf_probe_point *pp = &pf->pev->point;
952 Dwarf_Addr addr;
953 int ret;
954
955 if (pp->lazy_line)
956 ret = find_probe_point_lazy(in_die, pf);
957 else {
958 /* Get probe address */
959 if (dwarf_entrypc(in_die, &addr) != 0) {
960 pr_warning("Failed to get entry address of %s.\n",
961 dwarf_diename(in_die));
962 return -ENOENT;
963 }
964 pf->addr = addr;
965 pf->addr += pp->offset;
966 pr_debug("found inline addr: 0x%jx\n",
967 (uintmax_t)pf->addr);
968
969 ret = call_probe_finder(in_die, pf);
970 }
971
972 return ret;
973 }
974
975 /* Callback parameter with return value for libdw */
976 struct dwarf_callback_param {
977 void *data;
978 int retval;
979 };
980
981 /* Search function from function name */
982 static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
983 {
984 struct dwarf_callback_param *param = data;
985 struct probe_finder *pf = param->data;
986 struct perf_probe_point *pp = &pf->pev->point;
987
988 /* Check tag and diename */
989 if (!die_is_func_def(sp_die) ||
990 !die_compare_name(sp_die, pp->function))
991 return DWARF_CB_OK;
992
993 /* Check declared file */
994 if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
995 return DWARF_CB_OK;
996
997 pf->fname = dwarf_decl_file(sp_die);
998 if (pp->line) { /* Function relative line */
999 dwarf_decl_line(sp_die, &pf->lno);
1000 pf->lno += pp->line;
1001 param->retval = find_probe_point_by_line(pf);
1002 } else if (!dwarf_func_inline(sp_die)) {
1003 /* Real function */
1004 if (pp->lazy_line)
1005 param->retval = find_probe_point_lazy(sp_die, pf);
1006 else {
1007 if (dwarf_entrypc(sp_die, &pf->addr) != 0) {
1008 pr_warning("Failed to get entry address of "
1009 "%s.\n", dwarf_diename(sp_die));
1010 param->retval = -ENOENT;
1011 return DWARF_CB_ABORT;
1012 }
1013 pf->addr += pp->offset;
1014 /* TODO: Check the address in this function */
1015 param->retval = call_probe_finder(sp_die, pf);
1016 }
1017 } else
1018 /* Inlined function: search instances */
1019 param->retval = die_walk_instances(sp_die,
1020 probe_point_inline_cb, (void *)pf);
1021
1022 return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */
1023 }
1024
1025 static int find_probe_point_by_func(struct probe_finder *pf)
1026 {
1027 struct dwarf_callback_param _param = {.data = (void *)pf,
1028 .retval = 0};
1029 dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0);
1030 return _param.retval;
1031 }
1032
1033 struct pubname_callback_param {
1034 char *function;
1035 char *file;
1036 Dwarf_Die *cu_die;
1037 Dwarf_Die *sp_die;
1038 int found;
1039 };
1040
1041 static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
1042 {
1043 struct pubname_callback_param *param = data;
1044
1045 if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
1046 if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
1047 return DWARF_CB_OK;
1048
1049 if (die_compare_name(param->sp_die, param->function)) {
1050 if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
1051 return DWARF_CB_OK;
1052
1053 if (param->file &&
1054 strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
1055 return DWARF_CB_OK;
1056
1057 param->found = 1;
1058 return DWARF_CB_ABORT;
1059 }
1060 }
1061
1062 return DWARF_CB_OK;
1063 }
1064
1065 /* Find probe points from debuginfo */
1066 static int debuginfo__find_probes(struct debuginfo *self,
1067 struct probe_finder *pf)
1068 {
1069 struct perf_probe_point *pp = &pf->pev->point;
1070 Dwarf_Off off, noff;
1071 size_t cuhl;
1072 Dwarf_Die *diep;
1073 int ret = 0;
1074
1075 #if _ELFUTILS_PREREQ(0, 142)
1076 /* Get the call frame information from this dwarf */
1077 pf->cfi = dwarf_getcfi(self->dbg);
1078 #endif
1079
1080 off = 0;
1081 line_list__init(&pf->lcache);
1082
1083 /* Fastpath: lookup by function name from .debug_pubnames section */
1084 if (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(self->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 /* Loop on CUs (Compilation Unit) */
1106 while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
1107 /* Get the DIE(Debugging Information Entry) of this CU */
1108 diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die);
1109 if (!diep)
1110 continue;
1111
1112 /* Check if target file is included. */
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(NULL, 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
1133 found:
1134 line_list__free(&pf->lcache);
1135
1136 return ret;
1137 }
1138
1139 /* Add a found probe point into trace event list */
1140 static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
1141 {
1142 struct trace_event_finder *tf =
1143 container_of(pf, struct trace_event_finder, pf);
1144 struct probe_trace_event *tev;
1145 int ret, i;
1146
1147 /* Check number of tevs */
1148 if (tf->ntevs == tf->max_tevs) {
1149 pr_warning("Too many( > %d) probe point found.\n",
1150 tf->max_tevs);
1151 return -ERANGE;
1152 }
1153 tev = &tf->tevs[tf->ntevs++];
1154
1155 /* Trace point should be converted from subprogram DIE */
1156 ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr,
1157 pf->pev->point.retprobe, &tev->point);
1158 if (ret < 0)
1159 return ret;
1160
1161 pr_debug("Probe point found: %s+%lu\n", tev->point.symbol,
1162 tev->point.offset);
1163
1164 /* Find each argument */
1165 tev->nargs = pf->pev->nargs;
1166 tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
1167 if (tev->args == NULL)
1168 return -ENOMEM;
1169 for (i = 0; i < pf->pev->nargs; i++) {
1170 pf->pvar = &pf->pev->args[i];
1171 pf->tvar = &tev->args[i];
1172 /* Variable should be found from scope DIE */
1173 ret = find_variable(sc_die, pf);
1174 if (ret != 0)
1175 return ret;
1176 }
1177
1178 return 0;
1179 }
1180
1181 /* Find probe_trace_events specified by perf_probe_event from debuginfo */
1182 int debuginfo__find_trace_events(struct debuginfo *self,
1183 struct perf_probe_event *pev,
1184 struct probe_trace_event **tevs, int max_tevs)
1185 {
1186 struct trace_event_finder tf = {
1187 .pf = {.pev = pev, .callback = add_probe_trace_event},
1188 .mod = self->mod, .max_tevs = max_tevs};
1189 int ret;
1190
1191 /* Allocate result tevs array */
1192 *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs);
1193 if (*tevs == NULL)
1194 return -ENOMEM;
1195
1196 tf.tevs = *tevs;
1197 tf.ntevs = 0;
1198
1199 ret = debuginfo__find_probes(self, &tf.pf);
1200 if (ret < 0) {
1201 free(*tevs);
1202 *tevs = NULL;
1203 return ret;
1204 }
1205
1206 return (ret < 0) ? ret : tf.ntevs;
1207 }
1208
1209 #define MAX_VAR_LEN 64
1210
1211 /* Collect available variables in this scope */
1212 static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
1213 {
1214 struct available_var_finder *af = data;
1215 struct variable_list *vl;
1216 char buf[MAX_VAR_LEN];
1217 int tag, ret;
1218
1219 vl = &af->vls[af->nvls - 1];
1220
1221 tag = dwarf_tag(die_mem);
1222 if (tag == DW_TAG_formal_parameter ||
1223 tag == DW_TAG_variable) {
1224 ret = convert_variable_location(die_mem, af->pf.addr,
1225 af->pf.fb_ops, NULL);
1226 if (ret == 0) {
1227 ret = die_get_varname(die_mem, buf, MAX_VAR_LEN);
1228 pr_debug2("Add new var: %s\n", buf);
1229 if (ret > 0)
1230 strlist__add(vl->vars, buf);
1231 }
1232 }
1233
1234 if (af->child && dwarf_haspc(die_mem, af->pf.addr))
1235 return DIE_FIND_CB_CONTINUE;
1236 else
1237 return DIE_FIND_CB_SIBLING;
1238 }
1239
1240 /* Add a found vars into available variables list */
1241 static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
1242 {
1243 struct available_var_finder *af =
1244 container_of(pf, struct available_var_finder, pf);
1245 struct variable_list *vl;
1246 Dwarf_Die die_mem;
1247 int ret;
1248
1249 /* Check number of tevs */
1250 if (af->nvls == af->max_vls) {
1251 pr_warning("Too many( > %d) probe point found.\n", af->max_vls);
1252 return -ERANGE;
1253 }
1254 vl = &af->vls[af->nvls++];
1255
1256 /* Trace point should be converted from subprogram DIE */
1257 ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr,
1258 pf->pev->point.retprobe, &vl->point);
1259 if (ret < 0)
1260 return ret;
1261
1262 pr_debug("Probe point found: %s+%lu\n", vl->point.symbol,
1263 vl->point.offset);
1264
1265 /* Find local variables */
1266 vl->vars = strlist__new(true, NULL);
1267 if (vl->vars == NULL)
1268 return -ENOMEM;
1269 af->child = true;
1270 die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);
1271
1272 /* Find external variables */
1273 if (!af->externs)
1274 goto out;
1275 /* Don't need to search child DIE for externs. */
1276 af->child = false;
1277 die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);
1278
1279 out:
1280 if (strlist__empty(vl->vars)) {
1281 strlist__delete(vl->vars);
1282 vl->vars = NULL;
1283 }
1284
1285 return ret;
1286 }
1287
1288 /* Find available variables at given probe point */
1289 int debuginfo__find_available_vars_at(struct debuginfo *self,
1290 struct perf_probe_event *pev,
1291 struct variable_list **vls,
1292 int max_vls, bool externs)
1293 {
1294 struct available_var_finder af = {
1295 .pf = {.pev = pev, .callback = add_available_vars},
1296 .mod = self->mod,
1297 .max_vls = max_vls, .externs = externs};
1298 int ret;
1299
1300 /* Allocate result vls array */
1301 *vls = zalloc(sizeof(struct variable_list) * max_vls);
1302 if (*vls == NULL)
1303 return -ENOMEM;
1304
1305 af.vls = *vls;
1306 af.nvls = 0;
1307
1308 ret = debuginfo__find_probes(self, &af.pf);
1309 if (ret < 0) {
1310 /* Free vlist for error */
1311 while (af.nvls--) {
1312 if (af.vls[af.nvls].point.symbol)
1313 free(af.vls[af.nvls].point.symbol);
1314 if (af.vls[af.nvls].vars)
1315 strlist__delete(af.vls[af.nvls].vars);
1316 }
1317 free(af.vls);
1318 *vls = NULL;
1319 return ret;
1320 }
1321
1322 return (ret < 0) ? ret : af.nvls;
1323 }
1324
1325 /* Reverse search */
1326 int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr,
1327 struct perf_probe_point *ppt)
1328 {
1329 Dwarf_Die cudie, spdie, indie;
1330 Dwarf_Addr _addr = 0, baseaddr = 0;
1331 const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp;
1332 int baseline = 0, lineno = 0, ret = 0;
1333
1334 /* Adjust address with bias */
1335 addr += self->bias;
1336
1337 /* Find cu die */
1338 if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) {
1339 pr_warning("Failed to find debug information for address %lx\n",
1340 addr);
1341 ret = -EINVAL;
1342 goto end;
1343 }
1344
1345 /* Find a corresponding line (filename and lineno) */
1346 cu_find_lineinfo(&cudie, addr, &fname, &lineno);
1347 /* Don't care whether it failed or not */
1348
1349 /* Find a corresponding function (name, baseline and baseaddr) */
1350 if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) {
1351 /* Get function entry information */
1352 func = basefunc = dwarf_diename(&spdie);
1353 if (!func ||
1354 dwarf_entrypc(&spdie, &baseaddr) != 0 ||
1355 dwarf_decl_line(&spdie, &baseline) != 0) {
1356 lineno = 0;
1357 goto post;
1358 }
1359
1360 fname = dwarf_decl_file(&spdie);
1361 if (addr == (unsigned long)baseaddr) {
1362 /* Function entry - Relative line number is 0 */
1363 lineno = baseline;
1364 goto post;
1365 }
1366
1367 /* Track down the inline functions step by step */
1368 while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr,
1369 &indie)) {
1370 /* There is an inline function */
1371 if (dwarf_entrypc(&indie, &_addr) == 0 &&
1372 _addr == addr) {
1373 /*
1374 * addr is at an inline function entry.
1375 * In this case, lineno should be the call-site
1376 * line number. (overwrite lineinfo)
1377 */
1378 lineno = die_get_call_lineno(&indie);
1379 fname = die_get_call_file(&indie);
1380 break;
1381 } else {
1382 /*
1383 * addr is in an inline function body.
1384 * Since lineno points one of the lines
1385 * of the inline function, baseline should
1386 * be the entry line of the inline function.
1387 */
1388 tmp = dwarf_diename(&indie);
1389 if (!tmp ||
1390 dwarf_decl_line(&indie, &baseline) != 0)
1391 break;
1392 func = tmp;
1393 spdie = indie;
1394 }
1395 }
1396 /* Verify the lineno and baseline are in a same file */
1397 tmp = dwarf_decl_file(&spdie);
1398 if (!tmp || strcmp(tmp, fname) != 0)
1399 lineno = 0;
1400 }
1401
1402 post:
1403 /* Make a relative line number or an offset */
1404 if (lineno)
1405 ppt->line = lineno - baseline;
1406 else if (basefunc) {
1407 ppt->offset = addr - (unsigned long)baseaddr;
1408 func = basefunc;
1409 }
1410
1411 /* Duplicate strings */
1412 if (func) {
1413 ppt->function = strdup(func);
1414 if (ppt->function == NULL) {
1415 ret = -ENOMEM;
1416 goto end;
1417 }
1418 }
1419 if (fname) {
1420 ppt->file = strdup(fname);
1421 if (ppt->file == NULL) {
1422 if (ppt->function) {
1423 free(ppt->function);
1424 ppt->function = NULL;
1425 }
1426 ret = -ENOMEM;
1427 goto end;
1428 }
1429 }
1430 end:
1431 if (ret == 0 && (fname || func))
1432 ret = 1; /* Found a point */
1433 return ret;
1434 }
1435
1436 /* Add a line and store the src path */
1437 static int line_range_add_line(const char *src, unsigned int lineno,
1438 struct line_range *lr)
1439 {
1440 /* Copy source path */
1441 if (!lr->path) {
1442 lr->path = strdup(src);
1443 if (lr->path == NULL)
1444 return -ENOMEM;
1445 }
1446 return line_list__add_line(&lr->line_list, lineno);
1447 }
1448
1449 static int line_range_walk_cb(const char *fname, int lineno,
1450 Dwarf_Addr addr __maybe_unused,
1451 void *data)
1452 {
1453 struct line_finder *lf = data;
1454
1455 if ((strtailcmp(fname, lf->fname) != 0) ||
1456 (lf->lno_s > lineno || lf->lno_e < lineno))
1457 return 0;
1458
1459 if (line_range_add_line(fname, lineno, lf->lr) < 0)
1460 return -EINVAL;
1461
1462 return 0;
1463 }
1464
1465 /* Find line range from its line number */
1466 static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
1467 {
1468 int ret;
1469
1470 ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf);
1471
1472 /* Update status */
1473 if (ret >= 0)
1474 if (!list_empty(&lf->lr->line_list))
1475 ret = lf->found = 1;
1476 else
1477 ret = 0; /* Lines are not found */
1478 else {
1479 free(lf->lr->path);
1480 lf->lr->path = NULL;
1481 }
1482 return ret;
1483 }
1484
1485 static int line_range_inline_cb(Dwarf_Die *in_die, void *data)
1486 {
1487 find_line_range_by_line(in_die, data);
1488
1489 /*
1490 * We have to check all instances of inlined function, because
1491 * some execution paths can be optimized out depends on the
1492 * function argument of instances
1493 */
1494 return 0;
1495 }
1496
1497 /* Search function definition from function name */
1498 static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
1499 {
1500 struct dwarf_callback_param *param = data;
1501 struct line_finder *lf = param->data;
1502 struct line_range *lr = lf->lr;
1503
1504 /* Check declared file */
1505 if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
1506 return DWARF_CB_OK;
1507
1508 if (die_is_func_def(sp_die) &&
1509 die_compare_name(sp_die, lr->function)) {
1510 lf->fname = dwarf_decl_file(sp_die);
1511 dwarf_decl_line(sp_die, &lr->offset);
1512 pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset);
1513 lf->lno_s = lr->offset + lr->start;
1514 if (lf->lno_s < 0) /* Overflow */
1515 lf->lno_s = INT_MAX;
1516 lf->lno_e = lr->offset + lr->end;
1517 if (lf->lno_e < 0) /* Overflow */
1518 lf->lno_e = INT_MAX;
1519 pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e);
1520 lr->start = lf->lno_s;
1521 lr->end = lf->lno_e;
1522 if (dwarf_func_inline(sp_die))
1523 param->retval = die_walk_instances(sp_die,
1524 line_range_inline_cb, lf);
1525 else
1526 param->retval = find_line_range_by_line(sp_die, lf);
1527 return DWARF_CB_ABORT;
1528 }
1529 return DWARF_CB_OK;
1530 }
1531
1532 static int find_line_range_by_func(struct line_finder *lf)
1533 {
1534 struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
1535 dwarf_getfuncs(&lf->cu_die, line_range_search_cb, &param, 0);
1536 return param.retval;
1537 }
1538
1539 int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr)
1540 {
1541 struct line_finder lf = {.lr = lr, .found = 0};
1542 int ret = 0;
1543 Dwarf_Off off = 0, noff;
1544 size_t cuhl;
1545 Dwarf_Die *diep;
1546 const char *comp_dir;
1547
1548 /* Fastpath: lookup by function name from .debug_pubnames section */
1549 if (lr->function) {
1550 struct pubname_callback_param pubname_param = {
1551 .function = lr->function, .file = lr->file,
1552 .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
1553 struct dwarf_callback_param line_range_param = {
1554 .data = (void *)&lf, .retval = 0};
1555
1556 dwarf_getpubnames(self->dbg, pubname_search_cb,
1557 &pubname_param, 0);
1558 if (pubname_param.found) {
1559 line_range_search_cb(&lf.sp_die, &line_range_param);
1560 if (lf.found)
1561 goto found;
1562 }
1563 }
1564
1565 /* Loop on CUs (Compilation Unit) */
1566 while (!lf.found && ret >= 0) {
1567 if (dwarf_nextcu(self->dbg, off, &noff, &cuhl,
1568 NULL, NULL, NULL) != 0)
1569 break;
1570
1571 /* Get the DIE(Debugging Information Entry) of this CU */
1572 diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die);
1573 if (!diep)
1574 continue;
1575
1576 /* Check if target file is included. */
1577 if (lr->file)
1578 lf.fname = cu_find_realpath(&lf.cu_die, lr->file);
1579 else
1580 lf.fname = 0;
1581
1582 if (!lr->file || lf.fname) {
1583 if (lr->function)
1584 ret = find_line_range_by_func(&lf);
1585 else {
1586 lf.lno_s = lr->start;
1587 lf.lno_e = lr->end;
1588 ret = find_line_range_by_line(NULL, &lf);
1589 }
1590 }
1591 off = noff;
1592 }
1593
1594 found:
1595 /* Store comp_dir */
1596 if (lf.found) {
1597 comp_dir = cu_get_comp_dir(&lf.cu_die);
1598 if (comp_dir) {
1599 lr->comp_dir = strdup(comp_dir);
1600 if (!lr->comp_dir)
1601 ret = -ENOMEM;
1602 }
1603 }
1604
1605 pr_debug("path: %s\n", lr->path);
1606 return (ret < 0) ? ret : lf.found;
1607 }
1608
Linux with added FPC-III support