Commit | Line | Data |
---|---|---|
4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
29 | #include <getopt.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | #include <stdarg.h> | |
33 | #include <ctype.h> | |
cd932c59 | 34 | #include <dwarf-regs.h> |
074fc0e4 | 35 | |
124bb83c | 36 | #include <linux/bitops.h> |
89c69c0e MH |
37 | #include "event.h" |
38 | #include "debug.h" | |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
4ea42b18 MH |
46 | /* |
47 | * Compare the tail of two strings. | |
48 | * Return 0 if whole of either string is same as another's tail part. | |
49 | */ | |
50 | static int strtailcmp(const char *s1, const char *s2) | |
51 | { | |
52 | int i1 = strlen(s1); | |
53 | int i2 = strlen(s2); | |
d56728b8 | 54 | while (--i1 >= 0 && --i2 >= 0) { |
4ea42b18 MH |
55 | if (s1[i1] != s2[i2]) |
56 | return s1[i1] - s2[i2]; | |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
2a9c8c36 MH |
61 | /* Line number list operations */ |
62 | ||
63 | /* Add a line to line number list */ | |
d3b63d7a | 64 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
65 | { |
66 | struct line_node *ln; | |
67 | struct list_head *p; | |
68 | ||
69 | /* Reverse search, because new line will be the last one */ | |
70 | list_for_each_entry_reverse(ln, head, list) { | |
71 | if (ln->line < line) { | |
72 | p = &ln->list; | |
73 | goto found; | |
74 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 75 | return 1; |
2a9c8c36 MH |
76 | } |
77 | /* List is empty, or the smallest entry */ | |
78 | p = head; | |
79 | found: | |
80 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
81 | ln = zalloc(sizeof(struct line_node)); |
82 | if (ln == NULL) | |
83 | return -ENOMEM; | |
2a9c8c36 MH |
84 | ln->line = line; |
85 | INIT_LIST_HEAD(&ln->list); | |
86 | list_add(&ln->list, p); | |
e334016f | 87 | return 0; |
2a9c8c36 MH |
88 | } |
89 | ||
90 | /* Check if the line in line number list */ | |
d3b63d7a | 91 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
92 | { |
93 | struct line_node *ln; | |
94 | ||
95 | /* Reverse search, because new line will be the last one */ | |
96 | list_for_each_entry(ln, head, list) | |
97 | if (ln->line == line) | |
98 | return 1; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /* Init line number list */ | |
104 | static void line_list__init(struct list_head *head) | |
105 | { | |
106 | INIT_LIST_HEAD(head); | |
107 | } | |
108 | ||
109 | /* Free line number list */ | |
110 | static void line_list__free(struct list_head *head) | |
111 | { | |
112 | struct line_node *ln; | |
113 | while (!list_empty(head)) { | |
114 | ln = list_first_entry(head, struct line_node, list); | |
115 | list_del(&ln->list); | |
116 | free(ln); | |
117 | } | |
118 | } | |
119 | ||
469b9b88 | 120 | /* Dwarf FL wrappers */ |
469b9b88 MH |
121 | static char *debuginfo_path; /* Currently dummy */ |
122 | ||
123 | static const Dwfl_Callbacks offline_callbacks = { | |
124 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
125 | .debuginfo_path = &debuginfo_path, | |
126 | ||
127 | .section_address = dwfl_offline_section_address, | |
128 | ||
129 | /* We use this table for core files too. */ | |
130 | .find_elf = dwfl_build_id_find_elf, | |
131 | }; | |
132 | ||
469b9b88 MH |
133 | /* Get a Dwarf from offline image */ |
134 | static Dwarf *dwfl_init_offline_dwarf(int fd, Dwfl **dwflp, Dwarf_Addr *bias) | |
135 | { | |
136 | Dwfl_Module *mod; | |
137 | Dwarf *dbg = NULL; | |
138 | ||
139 | if (!dwflp) | |
140 | return NULL; | |
141 | ||
142 | *dwflp = dwfl_begin(&offline_callbacks); | |
143 | if (!*dwflp) | |
144 | return NULL; | |
145 | ||
146 | mod = dwfl_report_offline(*dwflp, "", "", fd); | |
147 | if (!mod) | |
148 | goto error; | |
149 | ||
150 | dbg = dwfl_module_getdwarf(mod, bias); | |
151 | if (!dbg) { | |
152 | error: | |
153 | dwfl_end(*dwflp); | |
154 | *dwflp = NULL; | |
155 | } | |
156 | return dbg; | |
157 | } | |
158 | ||
3b4694de MH |
159 | #if _ELFUTILS_PREREQ(0, 148) |
160 | /* This method is buggy if elfutils is older than 0.148 */ | |
161 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
162 | void **userdata, | |
163 | const char *module_name, | |
164 | Dwarf_Addr base, | |
165 | char **file_name, Elf **elfp) | |
166 | { | |
167 | int fd; | |
168 | const char *path = kernel_get_module_path(module_name); | |
169 | ||
170 | pr_debug2("Use file %s for %s\n", path, module_name); | |
171 | if (path) { | |
172 | fd = open(path, O_RDONLY); | |
173 | if (fd >= 0) { | |
174 | *file_name = strdup(path); | |
175 | return fd; | |
176 | } | |
177 | } | |
178 | /* If failed, try to call standard method */ | |
179 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
180 | file_name, elfp); | |
181 | } | |
182 | ||
183 | static const Dwfl_Callbacks kernel_callbacks = { | |
184 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
185 | .debuginfo_path = &debuginfo_path, | |
186 | ||
187 | .find_elf = __linux_kernel_find_elf, | |
188 | .section_address = dwfl_linux_kernel_module_section_address, | |
189 | }; | |
190 | ||
469b9b88 MH |
191 | /* Get a Dwarf from live kernel image */ |
192 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr, Dwfl **dwflp, | |
193 | Dwarf_Addr *bias) | |
194 | { | |
195 | Dwarf *dbg; | |
196 | ||
197 | if (!dwflp) | |
198 | return NULL; | |
199 | ||
200 | *dwflp = dwfl_begin(&kernel_callbacks); | |
201 | if (!*dwflp) | |
202 | return NULL; | |
203 | ||
204 | /* Load the kernel dwarves: Don't care the result here */ | |
205 | dwfl_linux_kernel_report_kernel(*dwflp); | |
206 | dwfl_linux_kernel_report_modules(*dwflp); | |
207 | ||
208 | dbg = dwfl_addrdwarf(*dwflp, addr, bias); | |
209 | /* Here, check whether we could get a real dwarf */ | |
210 | if (!dbg) { | |
3b4694de MH |
211 | pr_debug("Failed to find kernel dwarf at %lx\n", |
212 | (unsigned long)addr); | |
469b9b88 MH |
213 | dwfl_end(*dwflp); |
214 | *dwflp = NULL; | |
215 | } | |
216 | return dbg; | |
217 | } | |
3b4694de MH |
218 | #else |
219 | /* With older elfutils, this just support kernel module... */ | |
220 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr __used, Dwfl **dwflp, | |
221 | Dwarf_Addr *bias) | |
222 | { | |
223 | int fd; | |
224 | const char *path = kernel_get_module_path("kernel"); | |
225 | ||
226 | if (!path) { | |
227 | pr_err("Failed to find vmlinux path\n"); | |
228 | return NULL; | |
229 | } | |
230 | ||
231 | pr_debug2("Use file %s for debuginfo\n", path); | |
232 | fd = open(path, O_RDONLY); | |
233 | if (fd < 0) | |
234 | return NULL; | |
235 | ||
236 | return dwfl_init_offline_dwarf(fd, dwflp, bias); | |
237 | } | |
238 | #endif | |
469b9b88 | 239 | |
2a9c8c36 MH |
240 | /* Dwarf wrappers */ |
241 | ||
242 | /* Find the realpath of the target file. */ | |
243 | static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) | |
4ea42b18 | 244 | { |
804b3606 MH |
245 | Dwarf_Files *files; |
246 | size_t nfiles, i; | |
accd3cc4 | 247 | const char *src = NULL; |
4ea42b18 MH |
248 | int ret; |
249 | ||
250 | if (!fname) | |
2a9c8c36 | 251 | return NULL; |
4ea42b18 | 252 | |
804b3606 | 253 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
2a9c8c36 MH |
254 | if (ret != 0) |
255 | return NULL; | |
256 | ||
257 | for (i = 0; i < nfiles; i++) { | |
258 | src = dwarf_filesrc(files, i, NULL, NULL); | |
259 | if (strtailcmp(src, fname) == 0) | |
260 | break; | |
4ea42b18 | 261 | } |
c9e38582 MH |
262 | if (i == nfiles) |
263 | return NULL; | |
2a9c8c36 | 264 | return src; |
4ea42b18 MH |
265 | } |
266 | ||
6a330a3c MH |
267 | /* Get DW_AT_comp_dir (should be NULL with older gcc) */ |
268 | static const char *cu_get_comp_dir(Dwarf_Die *cu_die) | |
269 | { | |
270 | Dwarf_Attribute attr; | |
271 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) | |
272 | return NULL; | |
273 | return dwarf_formstring(&attr); | |
274 | } | |
275 | ||
1d46ea2a MH |
276 | /* Get a line number and file name for given address */ |
277 | static int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr, | |
278 | const char **fname, int *lineno) | |
279 | { | |
280 | Dwarf_Line *line; | |
281 | Dwarf_Addr laddr; | |
282 | ||
283 | line = dwarf_getsrc_die(cudie, (Dwarf_Addr)addr); | |
284 | if (line && dwarf_lineaddr(line, &laddr) == 0 && | |
285 | addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) { | |
286 | *fname = dwarf_linesrc(line, NULL, NULL); | |
287 | if (!*fname) | |
288 | /* line number is useless without filename */ | |
289 | *lineno = 0; | |
290 | } | |
291 | ||
292 | return *lineno ?: -ENOENT; | |
293 | } | |
294 | ||
016f262e MH |
295 | /* Compare diename and tname */ |
296 | static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) | |
297 | { | |
298 | const char *name; | |
299 | name = dwarf_diename(dw_die); | |
82175633 | 300 | return name ? (strcmp(tname, name) == 0) : false; |
016f262e MH |
301 | } |
302 | ||
5069ed86 MH |
303 | /* Get callsite line number of inline-function instance */ |
304 | static int die_get_call_lineno(Dwarf_Die *in_die) | |
305 | { | |
306 | Dwarf_Attribute attr; | |
307 | Dwarf_Word ret; | |
308 | ||
309 | if (!dwarf_attr(in_die, DW_AT_call_line, &attr)) | |
310 | return -ENOENT; | |
311 | ||
312 | dwarf_formudata(&attr, &ret); | |
313 | return (int)ret; | |
314 | } | |
315 | ||
4046b8bb MH |
316 | /* Get type die */ |
317 | static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
318 | { | |
319 | Dwarf_Attribute attr; | |
320 | ||
321 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && | |
322 | dwarf_formref_die(&attr, die_mem)) | |
323 | return die_mem; | |
324 | else | |
325 | return NULL; | |
326 | } | |
327 | ||
cf6eb489 MH |
328 | /* Get a type die, but skip qualifiers */ |
329 | static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
7df2f329 | 330 | { |
7df2f329 MH |
331 | int tag; |
332 | ||
333 | do { | |
4046b8bb MH |
334 | vr_die = die_get_type(vr_die, die_mem); |
335 | if (!vr_die) | |
336 | break; | |
337 | tag = dwarf_tag(vr_die); | |
7df2f329 MH |
338 | } while (tag == DW_TAG_const_type || |
339 | tag == DW_TAG_restrict_type || | |
340 | tag == DW_TAG_volatile_type || | |
cf6eb489 MH |
341 | tag == DW_TAG_shared_type); |
342 | ||
343 | return vr_die; | |
344 | } | |
345 | ||
346 | /* Get a type die, but skip qualifiers and typedef */ | |
347 | static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
348 | { | |
349 | do { | |
350 | vr_die = __die_get_real_type(vr_die, die_mem); | |
351 | } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); | |
7df2f329 | 352 | |
4046b8bb | 353 | return vr_die; |
7df2f329 MH |
354 | } |
355 | ||
124bb83c MH |
356 | static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name, |
357 | Dwarf_Word *result) | |
4984912e MH |
358 | { |
359 | Dwarf_Attribute attr; | |
124bb83c MH |
360 | |
361 | if (dwarf_attr(tp_die, attr_name, &attr) == NULL || | |
362 | dwarf_formudata(&attr, result) != 0) | |
363 | return -ENOENT; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static bool die_is_signed_type(Dwarf_Die *tp_die) | |
369 | { | |
4984912e MH |
370 | Dwarf_Word ret; |
371 | ||
124bb83c | 372 | if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret)) |
4984912e MH |
373 | return false; |
374 | ||
375 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
376 | ret == DW_ATE_signed_fixed); | |
377 | } | |
378 | ||
379 | static int die_get_byte_size(Dwarf_Die *tp_die) | |
380 | { | |
4984912e MH |
381 | Dwarf_Word ret; |
382 | ||
124bb83c MH |
383 | if (die_get_attr_udata(tp_die, DW_AT_byte_size, &ret)) |
384 | return 0; | |
385 | ||
386 | return (int)ret; | |
387 | } | |
388 | ||
389 | static int die_get_bit_size(Dwarf_Die *tp_die) | |
390 | { | |
391 | Dwarf_Word ret; | |
392 | ||
393 | if (die_get_attr_udata(tp_die, DW_AT_bit_size, &ret)) | |
394 | return 0; | |
395 | ||
396 | return (int)ret; | |
397 | } | |
398 | ||
399 | static int die_get_bit_offset(Dwarf_Die *tp_die) | |
400 | { | |
401 | Dwarf_Word ret; | |
402 | ||
403 | if (die_get_attr_udata(tp_die, DW_AT_bit_offset, &ret)) | |
4984912e MH |
404 | return 0; |
405 | ||
406 | return (int)ret; | |
407 | } | |
408 | ||
de1439d8 MH |
409 | /* Get data_member_location offset */ |
410 | static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
411 | { | |
412 | Dwarf_Attribute attr; | |
413 | Dwarf_Op *expr; | |
414 | size_t nexpr; | |
415 | int ret; | |
416 | ||
417 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
418 | return -ENOENT; | |
419 | ||
420 | if (dwarf_formudata(&attr, offs) != 0) { | |
421 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
422 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
423 | if (ret < 0 || nexpr == 0) | |
424 | return -ENOENT; | |
425 | ||
426 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
427 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
428 | expr[0].atom, nexpr); | |
429 | return -ENOTSUP; | |
430 | } | |
431 | *offs = (Dwarf_Word)expr[0].number; | |
432 | } | |
433 | return 0; | |
434 | } | |
435 | ||
016f262e MH |
436 | /* Return values for die_find callbacks */ |
437 | enum { | |
438 | DIE_FIND_CB_FOUND = 0, /* End of Search */ | |
439 | DIE_FIND_CB_CHILD = 1, /* Search only children */ | |
440 | DIE_FIND_CB_SIBLING = 2, /* Search only siblings */ | |
441 | DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */ | |
442 | }; | |
443 | ||
444 | /* Search a child die */ | |
445 | static Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
446 | int (*callback)(Dwarf_Die *, void *), | |
447 | void *data, Dwarf_Die *die_mem) | |
448 | { | |
449 | Dwarf_Die child_die; | |
450 | int ret; | |
451 | ||
452 | ret = dwarf_child(rt_die, die_mem); | |
453 | if (ret != 0) | |
454 | return NULL; | |
455 | ||
456 | do { | |
457 | ret = callback(die_mem, data); | |
458 | if (ret == DIE_FIND_CB_FOUND) | |
459 | return die_mem; | |
460 | ||
461 | if ((ret & DIE_FIND_CB_CHILD) && | |
462 | die_find_child(die_mem, callback, data, &child_die)) { | |
463 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
464 | return die_mem; | |
465 | } | |
466 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
467 | dwarf_siblingof(die_mem, die_mem) == 0); | |
468 | ||
469 | return NULL; | |
470 | } | |
471 | ||
804b3606 MH |
472 | struct __addr_die_search_param { |
473 | Dwarf_Addr addr; | |
474 | Dwarf_Die *die_mem; | |
475 | }; | |
476 | ||
477 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
631c9def | 478 | { |
804b3606 | 479 | struct __addr_die_search_param *ad = data; |
631c9def | 480 | |
804b3606 MH |
481 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
482 | dwarf_haspc(fn_die, ad->addr)) { | |
483 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
484 | return DWARF_CB_ABORT; | |
485 | } | |
486 | return DWARF_CB_OK; | |
487 | } | |
631c9def | 488 | |
804b3606 | 489 | /* Search a real subprogram including this line, */ |
95a3e4c4 MH |
490 | static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
491 | Dwarf_Die *die_mem) | |
804b3606 MH |
492 | { |
493 | struct __addr_die_search_param ad; | |
494 | ad.addr = addr; | |
495 | ad.die_mem = die_mem; | |
496 | /* dwarf_getscopes can't find subprogram. */ | |
497 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
498 | return NULL; | |
499 | else | |
500 | return die_mem; | |
631c9def MH |
501 | } |
502 | ||
016f262e MH |
503 | /* die_find callback for inline function search */ |
504 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
161a26b0 | 505 | { |
016f262e | 506 | Dwarf_Addr *addr = data; |
161a26b0 | 507 | |
016f262e MH |
508 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
509 | dwarf_haspc(die_mem, *addr)) | |
510 | return DIE_FIND_CB_FOUND; | |
161a26b0 | 511 | |
016f262e | 512 | return DIE_FIND_CB_CONTINUE; |
161a26b0 MH |
513 | } |
514 | ||
016f262e MH |
515 | /* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ |
516 | static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
517 | Dwarf_Die *die_mem) | |
4ea42b18 | 518 | { |
1d878083 MH |
519 | Dwarf_Die tmp_die; |
520 | ||
521 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die); | |
522 | if (!sp_die) | |
523 | return NULL; | |
524 | ||
525 | /* Inlined function could be recursive. Trace it until fail */ | |
526 | while (sp_die) { | |
527 | memcpy(die_mem, sp_die, sizeof(Dwarf_Die)); | |
528 | sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, | |
529 | &tmp_die); | |
530 | } | |
531 | ||
532 | return die_mem; | |
4ea42b18 MH |
533 | } |
534 | ||
4cc9cec6 MH |
535 | /* Walker on lines (Note: line number will not be sorted) */ |
536 | typedef int (* line_walk_handler_t) (const char *fname, int lineno, | |
537 | Dwarf_Addr addr, void *data); | |
538 | ||
539 | struct __line_walk_param { | |
5069ed86 | 540 | const char *fname; |
4cc9cec6 MH |
541 | line_walk_handler_t handler; |
542 | void *data; | |
543 | int retval; | |
544 | }; | |
545 | ||
5069ed86 MH |
546 | static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) |
547 | { | |
548 | struct __line_walk_param *lw = data; | |
549 | Dwarf_Addr addr; | |
550 | int lineno; | |
551 | ||
552 | if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) { | |
553 | lineno = die_get_call_lineno(in_die); | |
554 | if (lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) { | |
555 | lw->retval = lw->handler(lw->fname, lineno, addr, | |
556 | lw->data); | |
557 | if (lw->retval != 0) | |
558 | return DIE_FIND_CB_FOUND; | |
559 | } | |
560 | } | |
561 | return DIE_FIND_CB_SIBLING; | |
562 | } | |
563 | ||
564 | /* Walk on lines of blocks included in given DIE */ | |
4cc9cec6 MH |
565 | static int __die_walk_funclines(Dwarf_Die *sp_die, |
566 | line_walk_handler_t handler, void *data) | |
567 | { | |
5069ed86 MH |
568 | struct __line_walk_param lw = { |
569 | .handler = handler, | |
570 | .data = data, | |
571 | .retval = 0, | |
572 | }; | |
573 | Dwarf_Die die_mem; | |
4cc9cec6 | 574 | Dwarf_Addr addr; |
5069ed86 | 575 | int lineno; |
4cc9cec6 MH |
576 | |
577 | /* Handle function declaration line */ | |
5069ed86 MH |
578 | lw.fname = dwarf_decl_file(sp_die); |
579 | if (lw.fname && dwarf_decl_line(sp_die, &lineno) == 0 && | |
4cc9cec6 | 580 | dwarf_entrypc(sp_die, &addr) == 0) { |
5069ed86 MH |
581 | lw.retval = handler(lw.fname, lineno, addr, data); |
582 | if (lw.retval != 0) | |
583 | goto done; | |
4cc9cec6 | 584 | } |
5069ed86 MH |
585 | die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem); |
586 | done: | |
587 | return lw.retval; | |
4cc9cec6 MH |
588 | } |
589 | ||
590 | static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) | |
591 | { | |
592 | struct __line_walk_param *lw = data; | |
593 | ||
594 | lw->retval = __die_walk_funclines(sp_die, lw->handler, lw->data); | |
595 | if (lw->retval != 0) | |
596 | return DWARF_CB_ABORT; | |
597 | ||
598 | return DWARF_CB_OK; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Walk on lines inside given PDIE. If the PDIE is subprogram, walk only on | |
603 | * the lines inside the subprogram, otherwise PDIE must be a CU DIE. | |
604 | */ | |
605 | static int die_walk_lines(Dwarf_Die *pdie, line_walk_handler_t handler, | |
606 | void *data) | |
607 | { | |
608 | Dwarf_Lines *lines; | |
609 | Dwarf_Line *line; | |
610 | Dwarf_Addr addr; | |
611 | const char *fname; | |
612 | int lineno, ret = 0; | |
613 | Dwarf_Die die_mem, *cu_die; | |
614 | size_t nlines, i; | |
615 | ||
616 | /* Get the CU die */ | |
617 | if (dwarf_tag(pdie) == DW_TAG_subprogram) | |
618 | cu_die = dwarf_diecu(pdie, &die_mem, NULL, NULL); | |
619 | else | |
620 | cu_die = pdie; | |
621 | if (!cu_die) { | |
622 | pr_debug2("Failed to get CU from subprogram\n"); | |
623 | return -EINVAL; | |
624 | } | |
625 | ||
626 | /* Get lines list in the CU */ | |
627 | if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) { | |
628 | pr_debug2("Failed to get source lines on this CU.\n"); | |
629 | return -ENOENT; | |
630 | } | |
631 | pr_debug2("Get %zd lines from this CU\n", nlines); | |
632 | ||
633 | /* Walk on the lines on lines list */ | |
634 | for (i = 0; i < nlines; i++) { | |
635 | line = dwarf_onesrcline(lines, i); | |
636 | if (line == NULL || | |
637 | dwarf_lineno(line, &lineno) != 0 || | |
638 | dwarf_lineaddr(line, &addr) != 0) { | |
639 | pr_debug2("Failed to get line info. " | |
640 | "Possible error in debuginfo.\n"); | |
641 | continue; | |
642 | } | |
643 | /* Filter lines based on address */ | |
644 | if (pdie != cu_die) | |
645 | /* | |
646 | * Address filtering | |
647 | * The line is included in given function, and | |
648 | * no inline block includes it. | |
649 | */ | |
650 | if (!dwarf_haspc(pdie, addr) || | |
651 | die_find_inlinefunc(pdie, addr, &die_mem)) | |
652 | continue; | |
653 | /* Get source line */ | |
654 | fname = dwarf_linesrc(line, NULL, NULL); | |
655 | ||
656 | ret = handler(fname, lineno, addr, data); | |
657 | if (ret != 0) | |
658 | return ret; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Dwarf lines doesn't include function declarations and inlined | |
663 | * subroutines. We have to check functions list or given function. | |
664 | */ | |
665 | if (pdie != cu_die) | |
666 | ret = __die_walk_funclines(pdie, handler, data); | |
667 | else { | |
668 | struct __line_walk_param param = { | |
669 | .handler = handler, | |
670 | .data = data, | |
671 | .retval = 0, | |
672 | }; | |
673 | dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0); | |
674 | ret = param.retval; | |
675 | } | |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
378eeaad MH |
680 | struct __find_variable_param { |
681 | const char *name; | |
682 | Dwarf_Addr addr; | |
683 | }; | |
684 | ||
016f262e | 685 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
4ea42b18 | 686 | { |
378eeaad | 687 | struct __find_variable_param *fvp = data; |
016f262e | 688 | int tag; |
4ea42b18 | 689 | |
016f262e MH |
690 | tag = dwarf_tag(die_mem); |
691 | if ((tag == DW_TAG_formal_parameter || | |
692 | tag == DW_TAG_variable) && | |
378eeaad | 693 | die_compare_name(die_mem, fvp->name)) |
016f262e MH |
694 | return DIE_FIND_CB_FOUND; |
695 | ||
378eeaad MH |
696 | if (dwarf_haspc(die_mem, fvp->addr)) |
697 | return DIE_FIND_CB_CONTINUE; | |
698 | else | |
699 | return DIE_FIND_CB_SIBLING; | |
4ea42b18 MH |
700 | } |
701 | ||
378eeaad MH |
702 | /* Find a variable called 'name' at given address */ |
703 | static Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, | |
704 | Dwarf_Addr addr, Dwarf_Die *die_mem) | |
4ea42b18 | 705 | { |
378eeaad MH |
706 | struct __find_variable_param fvp = { .name = name, .addr = addr}; |
707 | ||
708 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, | |
016f262e | 709 | die_mem); |
4ea42b18 MH |
710 | } |
711 | ||
7df2f329 MH |
712 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
713 | { | |
714 | const char *name = data; | |
715 | ||
716 | if ((dwarf_tag(die_mem) == DW_TAG_member) && | |
82175633 | 717 | die_compare_name(die_mem, name)) |
7df2f329 MH |
718 | return DIE_FIND_CB_FOUND; |
719 | ||
720 | return DIE_FIND_CB_SIBLING; | |
721 | } | |
722 | ||
723 | /* Find a member called 'name' */ | |
724 | static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
725 | Dwarf_Die *die_mem) | |
726 | { | |
727 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
728 | die_mem); | |
729 | } | |
730 | ||
cf6eb489 MH |
731 | /* Get the name of given variable DIE */ |
732 | static int die_get_typename(Dwarf_Die *vr_die, char *buf, int len) | |
733 | { | |
734 | Dwarf_Die type; | |
735 | int tag, ret, ret2; | |
736 | const char *tmp = ""; | |
737 | ||
738 | if (__die_get_real_type(vr_die, &type) == NULL) | |
739 | return -ENOENT; | |
740 | ||
741 | tag = dwarf_tag(&type); | |
742 | if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) | |
743 | tmp = "*"; | |
744 | else if (tag == DW_TAG_subroutine_type) { | |
745 | /* Function pointer */ | |
746 | ret = snprintf(buf, len, "(function_type)"); | |
747 | return (ret >= len) ? -E2BIG : ret; | |
748 | } else { | |
749 | if (!dwarf_diename(&type)) | |
750 | return -ENOENT; | |
751 | if (tag == DW_TAG_union_type) | |
752 | tmp = "union "; | |
753 | else if (tag == DW_TAG_structure_type) | |
754 | tmp = "struct "; | |
755 | /* Write a base name */ | |
756 | ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type)); | |
757 | return (ret >= len) ? -E2BIG : ret; | |
758 | } | |
759 | ret = die_get_typename(&type, buf, len); | |
760 | if (ret > 0) { | |
761 | ret2 = snprintf(buf + ret, len - ret, "%s", tmp); | |
762 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
763 | } | |
764 | return ret; | |
765 | } | |
766 | ||
767 | /* Get the name and type of given variable DIE, stored as "type\tname" */ | |
768 | static int die_get_varname(Dwarf_Die *vr_die, char *buf, int len) | |
769 | { | |
770 | int ret, ret2; | |
771 | ||
772 | ret = die_get_typename(vr_die, buf, len); | |
773 | if (ret < 0) { | |
774 | pr_debug("Failed to get type, make it unknown.\n"); | |
775 | ret = snprintf(buf, len, "(unknown_type)"); | |
776 | } | |
777 | if (ret > 0) { | |
778 | ret2 = snprintf(buf + ret, len - ret, "\t%s", | |
779 | dwarf_diename(vr_die)); | |
780 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
781 | } | |
782 | return ret; | |
783 | } | |
784 | ||
4ea42b18 MH |
785 | /* |
786 | * Probe finder related functions | |
787 | */ | |
788 | ||
0e60836b | 789 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 790 | { |
0e60836b SD |
791 | struct probe_trace_arg_ref *ref; |
792 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
793 | if (ref != NULL) |
794 | ref->offset = offs; | |
795 | return ref; | |
796 | } | |
797 | ||
cf6eb489 MH |
798 | /* |
799 | * Convert a location into trace_arg. | |
800 | * If tvar == NULL, this just checks variable can be converted. | |
801 | */ | |
802 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
803 | Dwarf_Op *fb_ops, | |
804 | struct probe_trace_arg *tvar) | |
4ea42b18 | 805 | { |
b7dcb857 MH |
806 | Dwarf_Attribute attr; |
807 | Dwarf_Op *op; | |
808 | size_t nops; | |
804b3606 MH |
809 | unsigned int regn; |
810 | Dwarf_Word offs = 0; | |
4235b045 | 811 | bool ref = false; |
4ea42b18 | 812 | const char *regs; |
b7dcb857 MH |
813 | int ret; |
814 | ||
632941c4 MH |
815 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
816 | goto static_var; | |
817 | ||
b7dcb857 MH |
818 | /* TODO: handle more than 1 exprs */ |
819 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 820 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
821 | nops == 0) { |
822 | /* TODO: Support const_value */ | |
b7dcb857 MH |
823 | return -ENOENT; |
824 | } | |
825 | ||
826 | if (op->atom == DW_OP_addr) { | |
632941c4 | 827 | static_var: |
cf6eb489 MH |
828 | if (!tvar) |
829 | return 0; | |
b7dcb857 MH |
830 | /* Static variables on memory (not stack), make @varname */ |
831 | ret = strlen(dwarf_diename(vr_die)); | |
832 | tvar->value = zalloc(ret + 2); | |
833 | if (tvar->value == NULL) | |
834 | return -ENOMEM; | |
835 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
836 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
837 | if (tvar->ref == NULL) | |
838 | return -ENOMEM; | |
839 | return 0; | |
840 | } | |
4ea42b18 | 841 | |
4ea42b18 | 842 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 843 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 844 | if (fb_ops == NULL) |
b55a87ad | 845 | return -ENOTSUP; |
4235b045 | 846 | ref = true; |
804b3606 | 847 | offs = op->number; |
cf6eb489 | 848 | op = &fb_ops[0]; |
804b3606 | 849 | } |
4ea42b18 | 850 | |
804b3606 MH |
851 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
852 | regn = op->atom - DW_OP_breg0; | |
853 | offs += op->number; | |
4235b045 | 854 | ref = true; |
804b3606 MH |
855 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
856 | regn = op->atom - DW_OP_reg0; | |
857 | } else if (op->atom == DW_OP_bregx) { | |
858 | regn = op->number; | |
859 | offs += op->number2; | |
4235b045 | 860 | ref = true; |
804b3606 MH |
861 | } else if (op->atom == DW_OP_regx) { |
862 | regn = op->number; | |
b55a87ad | 863 | } else { |
cf6eb489 | 864 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
865 | return -ENOTSUP; |
866 | } | |
4ea42b18 | 867 | |
cf6eb489 MH |
868 | if (!tvar) |
869 | return 0; | |
870 | ||
4ea42b18 | 871 | regs = get_arch_regstr(regn); |
b55a87ad | 872 | if (!regs) { |
cf6eb489 | 873 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
874 | pr_warning("Mapping for the register number %u " |
875 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
876 | return -ERANGE; |
877 | } | |
4ea42b18 | 878 | |
02b95dad MH |
879 | tvar->value = strdup(regs); |
880 | if (tvar->value == NULL) | |
881 | return -ENOMEM; | |
882 | ||
4235b045 | 883 | if (ref) { |
b7dcb857 | 884 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
885 | if (tvar->ref == NULL) |
886 | return -ENOMEM; | |
4235b045 | 887 | } |
b55a87ad | 888 | return 0; |
4ea42b18 MH |
889 | } |
890 | ||
124bb83c MH |
891 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
892 | ||
b55a87ad | 893 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 894 | struct probe_trace_arg *tvar, |
73317b95 | 895 | const char *cast) |
4984912e | 896 | { |
0e60836b | 897 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
898 | Dwarf_Die type; |
899 | char buf[16]; | |
900 | int ret; | |
901 | ||
73317b95 MH |
902 | /* TODO: check all types */ |
903 | if (cast && strcmp(cast, "string") != 0) { | |
904 | /* Non string type is OK */ | |
905 | tvar->type = strdup(cast); | |
906 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
907 | } | |
908 | ||
124bb83c MH |
909 | if (die_get_bit_size(vr_die) != 0) { |
910 | /* This is a bitfield */ | |
911 | ret = snprintf(buf, 16, "b%d@%d/%zd", die_get_bit_size(vr_die), | |
912 | die_get_bit_offset(vr_die), | |
913 | BYTES_TO_BITS(die_get_byte_size(vr_die))); | |
914 | goto formatted; | |
915 | } | |
916 | ||
b55a87ad MH |
917 | if (die_get_real_type(vr_die, &type) == NULL) { |
918 | pr_warning("Failed to get a type information of %s.\n", | |
919 | dwarf_diename(vr_die)); | |
920 | return -ENOENT; | |
921 | } | |
4984912e | 922 | |
b2a3c12b MH |
923 | pr_debug("%s type is %s.\n", |
924 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
925 | ||
73317b95 MH |
926 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
927 | ret = dwarf_tag(&type); | |
928 | if (ret != DW_TAG_pointer_type && | |
929 | ret != DW_TAG_array_type) { | |
930 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 931 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
932 | dwarf_diename(vr_die), dwarf_diename(&type)); |
933 | return -EINVAL; | |
934 | } | |
935 | if (ret == DW_TAG_pointer_type) { | |
936 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
937 | pr_warning("Failed to get a type" |
938 | " information.\n"); | |
73317b95 MH |
939 | return -ENOENT; |
940 | } | |
941 | while (*ref_ptr) | |
942 | ref_ptr = &(*ref_ptr)->next; | |
943 | /* Add new reference with offset +0 */ | |
0e60836b | 944 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
945 | if (*ref_ptr == NULL) { |
946 | pr_warning("Out of memory error\n"); | |
947 | return -ENOMEM; | |
948 | } | |
949 | } | |
82175633 MH |
950 | if (!die_compare_name(&type, "char") && |
951 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 952 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 953 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
954 | dwarf_diename(vr_die)); |
955 | return -EINVAL; | |
956 | } | |
957 | tvar->type = strdup(cast); | |
958 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
959 | } | |
960 | ||
124bb83c MH |
961 | ret = BYTES_TO_BITS(die_get_byte_size(&type)); |
962 | if (!ret) | |
963 | /* No size ... try to use default type */ | |
964 | return 0; | |
4984912e | 965 | |
124bb83c MH |
966 | /* Check the bitwidth */ |
967 | if (ret > MAX_BASIC_TYPE_BITS) { | |
968 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
969 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
970 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 971 | } |
124bb83c MH |
972 | ret = snprintf(buf, 16, "%c%d", |
973 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
974 | ||
975 | formatted: | |
976 | if (ret < 0 || ret >= 16) { | |
977 | if (ret >= 16) | |
978 | ret = -E2BIG; | |
979 | pr_warning("Failed to convert variable type: %s\n", | |
980 | strerror(-ret)); | |
981 | return ret; | |
982 | } | |
983 | tvar->type = strdup(buf); | |
984 | if (tvar->type == NULL) | |
985 | return -ENOMEM; | |
b55a87ad | 986 | return 0; |
4984912e MH |
987 | } |
988 | ||
b55a87ad | 989 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 990 | struct perf_probe_arg_field *field, |
0e60836b | 991 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 992 | Dwarf_Die *die_mem) |
7df2f329 | 993 | { |
0e60836b | 994 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
995 | Dwarf_Die type; |
996 | Dwarf_Word offs; | |
b2a3c12b | 997 | int ret, tag; |
7df2f329 MH |
998 | |
999 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
1000 | if (die_get_real_type(vr_die, &type) == NULL) { |
1001 | pr_warning("Failed to get the type of %s.\n", varname); | |
1002 | return -ENOENT; | |
1003 | } | |
b2a3c12b MH |
1004 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
1005 | tag = dwarf_tag(&type); | |
1006 | ||
1007 | if (field->name[0] == '[' && | |
1008 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
1009 | if (field->next) | |
1010 | /* Save original type for next field */ | |
1011 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
1012 | /* Get the type of this array */ | |
1013 | if (die_get_real_type(&type, &type) == NULL) { | |
1014 | pr_warning("Failed to get the type of %s.\n", varname); | |
1015 | return -ENOENT; | |
1016 | } | |
1017 | pr_debug2("Array real type: (%x)\n", | |
1018 | (unsigned)dwarf_dieoffset(&type)); | |
1019 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 1020 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
1021 | if (ref == NULL) |
1022 | return -ENOMEM; | |
1023 | if (*ref_ptr) | |
1024 | (*ref_ptr)->next = ref; | |
1025 | else | |
1026 | *ref_ptr = ref; | |
1027 | } | |
1028 | ref->offset += die_get_byte_size(&type) * field->index; | |
1029 | if (!field->next) | |
1030 | /* Save vr_die for converting types */ | |
1031 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
1032 | goto next; | |
1033 | } else if (tag == DW_TAG_pointer_type) { | |
1034 | /* Check the pointer and dereference */ | |
b55a87ad MH |
1035 | if (!field->ref) { |
1036 | pr_err("Semantic error: %s must be referred by '->'\n", | |
1037 | field->name); | |
1038 | return -EINVAL; | |
1039 | } | |
7df2f329 | 1040 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
1041 | if (die_get_real_type(&type, &type) == NULL) { |
1042 | pr_warning("Failed to get the type of %s.\n", varname); | |
1043 | return -ENOENT; | |
1044 | } | |
12e5a7ae | 1045 | /* Verify it is a data structure */ |
b55a87ad MH |
1046 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
1047 | pr_warning("%s is not a data structure.\n", varname); | |
1048 | return -EINVAL; | |
1049 | } | |
12e5a7ae | 1050 | |
0e60836b | 1051 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
1052 | if (ref == NULL) |
1053 | return -ENOMEM; | |
7df2f329 MH |
1054 | if (*ref_ptr) |
1055 | (*ref_ptr)->next = ref; | |
1056 | else | |
1057 | *ref_ptr = ref; | |
1058 | } else { | |
12e5a7ae | 1059 | /* Verify it is a data structure */ |
b2a3c12b | 1060 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
1061 | pr_warning("%s is not a data structure.\n", varname); |
1062 | return -EINVAL; | |
1063 | } | |
b2a3c12b | 1064 | if (field->name[0] == '[') { |
0e43e5d2 MH |
1065 | pr_err("Semantic error: %s is not a pointor" |
1066 | " nor array.\n", varname); | |
b2a3c12b MH |
1067 | return -EINVAL; |
1068 | } | |
b55a87ad MH |
1069 | if (field->ref) { |
1070 | pr_err("Semantic error: %s must be referred by '.'\n", | |
1071 | field->name); | |
1072 | return -EINVAL; | |
1073 | } | |
1074 | if (!ref) { | |
1075 | pr_warning("Structure on a register is not " | |
1076 | "supported yet.\n"); | |
1077 | return -ENOTSUP; | |
1078 | } | |
7df2f329 MH |
1079 | } |
1080 | ||
b55a87ad MH |
1081 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
1082 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
1083 | dwarf_diename(&type), field->name); | |
1084 | return -EINVAL; | |
1085 | } | |
7df2f329 MH |
1086 | |
1087 | /* Get the offset of the field */ | |
de1439d8 MH |
1088 | ret = die_get_data_member_location(die_mem, &offs); |
1089 | if (ret < 0) { | |
b55a87ad | 1090 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 1091 | return ret; |
b55a87ad | 1092 | } |
7df2f329 MH |
1093 | ref->offset += (long)offs; |
1094 | ||
b2a3c12b | 1095 | next: |
7df2f329 MH |
1096 | /* Converting next field */ |
1097 | if (field->next) | |
b55a87ad | 1098 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 1099 | field->next, &ref, die_mem); |
b55a87ad MH |
1100 | else |
1101 | return 0; | |
7df2f329 MH |
1102 | } |
1103 | ||
4ea42b18 | 1104 | /* Show a variables in kprobe event format */ |
b55a87ad | 1105 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 1106 | { |
4984912e | 1107 | Dwarf_Die die_mem; |
4ea42b18 MH |
1108 | int ret; |
1109 | ||
b7dcb857 MH |
1110 | pr_debug("Converting variable %s into trace event.\n", |
1111 | dwarf_diename(vr_die)); | |
804b3606 | 1112 | |
cf6eb489 MH |
1113 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
1114 | pf->tvar); | |
1115 | if (ret == -ENOENT) | |
1116 | pr_err("Failed to find the location of %s at this address.\n" | |
1117 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
1118 | else if (ret == -ENOTSUP) | |
1119 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
1120 | else if (pf->pvar->field) { | |
b55a87ad MH |
1121 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
1122 | pf->pvar->field, &pf->tvar->ref, | |
1123 | &die_mem); | |
4984912e MH |
1124 | vr_die = &die_mem; |
1125 | } | |
73317b95 MH |
1126 | if (ret == 0) |
1127 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 1128 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 1129 | return ret; |
4ea42b18 MH |
1130 | } |
1131 | ||
4ea42b18 | 1132 | /* Find a variable in a subprogram die */ |
b55a87ad | 1133 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 1134 | { |
b7dcb857 | 1135 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 1136 | char buf[32], *ptr; |
b7dcb857 | 1137 | int ret, nscopes; |
4ea42b18 | 1138 | |
367e94c1 MH |
1139 | if (!is_c_varname(pf->pvar->var)) { |
1140 | /* Copy raw parameters */ | |
1141 | pf->tvar->value = strdup(pf->pvar->var); | |
1142 | if (pf->tvar->value == NULL) | |
1143 | return -ENOMEM; | |
1144 | if (pf->pvar->type) { | |
1145 | pf->tvar->type = strdup(pf->pvar->type); | |
1146 | if (pf->tvar->type == NULL) | |
1147 | return -ENOMEM; | |
1148 | } | |
1149 | if (pf->pvar->name) { | |
1150 | pf->tvar->name = strdup(pf->pvar->name); | |
1151 | if (pf->tvar->name == NULL) | |
1152 | return -ENOMEM; | |
1153 | } else | |
1154 | pf->tvar->name = NULL; | |
1155 | return 0; | |
1156 | } | |
1157 | ||
48481938 | 1158 | if (pf->pvar->name) |
02b95dad | 1159 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 1160 | else { |
02b95dad MH |
1161 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
1162 | if (ret < 0) | |
1163 | return ret; | |
11a1ca35 MH |
1164 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
1165 | if (ptr) | |
1166 | *ptr = '_'; | |
02b95dad | 1167 | pf->tvar->name = strdup(buf); |
48481938 | 1168 | } |
02b95dad MH |
1169 | if (pf->tvar->name == NULL) |
1170 | return -ENOMEM; | |
48481938 | 1171 | |
b55a87ad MH |
1172 | pr_debug("Searching '%s' variable in context.\n", |
1173 | pf->pvar->var); | |
1174 | /* Search child die for local variables and parameters. */ | |
378eeaad | 1175 | if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
1176 | ret = convert_variable(&vr_die, pf); |
1177 | else { | |
1178 | /* Search upper class */ | |
1179 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
632941c4 MH |
1180 | while (nscopes-- > 1) { |
1181 | pr_debug("Searching variables in %s\n", | |
1182 | dwarf_diename(&scopes[nscopes])); | |
1183 | /* We should check this scope, so give dummy address */ | |
1184 | if (die_find_variable_at(&scopes[nscopes], | |
1185 | pf->pvar->var, 0, | |
1186 | &vr_die)) { | |
b7dcb857 | 1187 | ret = convert_variable(&vr_die, pf); |
632941c4 MH |
1188 | goto found; |
1189 | } | |
1190 | } | |
1191 | if (scopes) | |
b7dcb857 | 1192 | free(scopes); |
632941c4 | 1193 | ret = -ENOENT; |
b7dcb857 | 1194 | } |
632941c4 | 1195 | found: |
b7dcb857 | 1196 | if (ret < 0) |
b55a87ad MH |
1197 | pr_warning("Failed to find '%s' in this function.\n", |
1198 | pf->pvar->var); | |
b7dcb857 | 1199 | return ret; |
4ea42b18 MH |
1200 | } |
1201 | ||
cf6eb489 MH |
1202 | /* Convert subprogram DIE to trace point */ |
1203 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
1204 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 1205 | { |
e92b85e1 | 1206 | Dwarf_Addr eaddr; |
804b3606 | 1207 | const char *name; |
e92b85e1 | 1208 | |
4235b045 | 1209 | /* Copy the name of probe point */ |
804b3606 MH |
1210 | name = dwarf_diename(sp_die); |
1211 | if (name) { | |
b55a87ad | 1212 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 1213 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
1214 | dwarf_diename(sp_die)); |
1215 | return -ENOENT; | |
1216 | } | |
cf6eb489 MH |
1217 | tp->symbol = strdup(name); |
1218 | if (tp->symbol == NULL) | |
02b95dad | 1219 | return -ENOMEM; |
cf6eb489 | 1220 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 1221 | } else |
4ea42b18 | 1222 | /* This function has no name. */ |
cf6eb489 | 1223 | tp->offset = (unsigned long)paddr; |
4235b045 | 1224 | |
04ddd04b | 1225 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
1226 | if (retprobe) { |
1227 | if (eaddr != paddr) { | |
04ddd04b | 1228 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 1229 | " a real function.\n"); |
04ddd04b MH |
1230 | return -EINVAL; |
1231 | } | |
cf6eb489 | 1232 | tp->retprobe = true; |
04ddd04b MH |
1233 | } |
1234 | ||
cf6eb489 MH |
1235 | return 0; |
1236 | } | |
1237 | ||
1238 | /* Call probe_finder callback with real subprogram DIE */ | |
1239 | static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1240 | { | |
1241 | Dwarf_Die die_mem; | |
1242 | Dwarf_Attribute fb_attr; | |
1243 | size_t nops; | |
1244 | int ret; | |
1245 | ||
1246 | /* If no real subprogram, find a real one */ | |
1247 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
1248 | sp_die = die_find_real_subprogram(&pf->cu_die, | |
1249 | pf->addr, &die_mem); | |
1250 | if (!sp_die) { | |
1251 | pr_warning("Failed to find probe point in any " | |
1252 | "functions.\n"); | |
1253 | return -ENOENT; | |
1254 | } | |
1255 | } | |
4ea42b18 | 1256 | |
804b3606 MH |
1257 | /* Get the frame base attribute/ops */ |
1258 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 1259 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 1260 | if (ret <= 0 || nops == 0) { |
804b3606 | 1261 | pf->fb_ops = NULL; |
7752f1b0 | 1262 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
1263 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
1264 | pf->cfi != NULL) { | |
1265 | Dwarf_Frame *frame; | |
b55a87ad MH |
1266 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
1267 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 1268 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
1269 | (uintmax_t)pf->addr); |
1270 | return -ENOENT; | |
1271 | } | |
7752f1b0 | 1272 | #endif |
a34a9854 | 1273 | } |
804b3606 | 1274 | |
cf6eb489 MH |
1275 | /* Call finder's callback handler */ |
1276 | ret = pf->callback(sp_die, pf); | |
804b3606 MH |
1277 | |
1278 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
1279 | pf->fb_ops = NULL; | |
cf6eb489 MH |
1280 | |
1281 | return ret; | |
4ea42b18 MH |
1282 | } |
1283 | ||
4cc9cec6 MH |
1284 | static int probe_point_line_walker(const char *fname, int lineno, |
1285 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 1286 | { |
4cc9cec6 MH |
1287 | struct probe_finder *pf = data; |
1288 | int ret; | |
4ea42b18 | 1289 | |
4cc9cec6 MH |
1290 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
1291 | return 0; | |
4ea42b18 | 1292 | |
4cc9cec6 MH |
1293 | pf->addr = addr; |
1294 | ret = call_probe_finder(NULL, pf); | |
b0ef0732 | 1295 | |
4cc9cec6 | 1296 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 1297 | return ret < 0 ? ret : 0; |
4cc9cec6 | 1298 | } |
804b3606 | 1299 | |
4cc9cec6 MH |
1300 | /* Find probe point from its line number */ |
1301 | static int find_probe_point_by_line(struct probe_finder *pf) | |
1302 | { | |
1303 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
1304 | } |
1305 | ||
2a9c8c36 MH |
1306 | /* Find lines which match lazy pattern */ |
1307 | static int find_lazy_match_lines(struct list_head *head, | |
1308 | const char *fname, const char *pat) | |
1309 | { | |
f50c2169 FBH |
1310 | FILE *fp; |
1311 | char *line = NULL; | |
1312 | size_t line_len; | |
1313 | ssize_t len; | |
1314 | int count = 0, linenum = 1; | |
1315 | ||
1316 | fp = fopen(fname, "r"); | |
1317 | if (!fp) { | |
1318 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 1319 | return -errno; |
b55a87ad MH |
1320 | } |
1321 | ||
f50c2169 | 1322 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 1323 | |
f50c2169 FBH |
1324 | if (line[len - 1] == '\n') |
1325 | line[len - 1] = '\0'; | |
1326 | ||
1327 | if (strlazymatch(line, pat)) { | |
1328 | line_list__add_line(head, linenum); | |
1329 | count++; | |
2a9c8c36 | 1330 | } |
f50c2169 | 1331 | linenum++; |
2a9c8c36 | 1332 | } |
f50c2169 FBH |
1333 | |
1334 | if (ferror(fp)) | |
1335 | count = -errno; | |
1336 | free(line); | |
1337 | fclose(fp); | |
1338 | ||
1339 | if (count == 0) | |
1340 | pr_debug("No matched lines found in %s.\n", fname); | |
1341 | return count; | |
2a9c8c36 MH |
1342 | } |
1343 | ||
4cc9cec6 MH |
1344 | static int probe_point_lazy_walker(const char *fname, int lineno, |
1345 | Dwarf_Addr addr, void *data) | |
1346 | { | |
1347 | struct probe_finder *pf = data; | |
1348 | int ret; | |
1349 | ||
1350 | if (!line_list__has_line(&pf->lcache, lineno) || | |
1351 | strtailcmp(fname, pf->fname) != 0) | |
1352 | return 0; | |
1353 | ||
1354 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
1355 | lineno, (unsigned long long)addr); | |
1356 | pf->addr = addr; | |
1357 | ret = call_probe_finder(NULL, pf); | |
1358 | ||
1359 | /* | |
1360 | * Continue if no error, because the lazy pattern will match | |
1361 | * to other lines | |
1362 | */ | |
5e814dd5 | 1363 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
1364 | } |
1365 | ||
2a9c8c36 | 1366 | /* Find probe points from lazy pattern */ |
b55a87ad | 1367 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 1368 | { |
b55a87ad | 1369 | int ret = 0; |
2a9c8c36 MH |
1370 | |
1371 | if (list_empty(&pf->lcache)) { | |
1372 | /* Matching lazy line pattern */ | |
1373 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 1374 | pf->pev->point.lazy_line); |
f50c2169 | 1375 | if (ret <= 0) |
b55a87ad | 1376 | return ret; |
2a9c8c36 MH |
1377 | } |
1378 | ||
4cc9cec6 | 1379 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
1380 | } |
1381 | ||
b55a87ad MH |
1382 | /* Callback parameter with return value */ |
1383 | struct dwarf_callback_param { | |
1384 | void *data; | |
1385 | int retval; | |
1386 | }; | |
1387 | ||
e92b85e1 MH |
1388 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1389 | { | |
b55a87ad MH |
1390 | struct dwarf_callback_param *param = data; |
1391 | struct probe_finder *pf = param->data; | |
4235b045 | 1392 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1393 | Dwarf_Addr addr; |
e92b85e1 | 1394 | |
2a9c8c36 | 1395 | if (pp->lazy_line) |
b55a87ad | 1396 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1397 | else { |
1398 | /* Get probe address */ | |
b55a87ad | 1399 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 1400 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad MH |
1401 | dwarf_diename(in_die)); |
1402 | param->retval = -ENOENT; | |
1403 | return DWARF_CB_ABORT; | |
1404 | } | |
1405 | pf->addr = addr; | |
2a9c8c36 MH |
1406 | pf->addr += pp->offset; |
1407 | pr_debug("found inline addr: 0x%jx\n", | |
1408 | (uintmax_t)pf->addr); | |
1409 | ||
cf6eb489 | 1410 | param->retval = call_probe_finder(in_die, pf); |
5d1ee041 MH |
1411 | if (param->retval < 0) |
1412 | return DWARF_CB_ABORT; | |
2a9c8c36 | 1413 | } |
e92b85e1 | 1414 | |
e92b85e1 MH |
1415 | return DWARF_CB_OK; |
1416 | } | |
804b3606 | 1417 | |
4ea42b18 | 1418 | /* Search function from function name */ |
e92b85e1 | 1419 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1420 | { |
b55a87ad MH |
1421 | struct dwarf_callback_param *param = data; |
1422 | struct probe_finder *pf = param->data; | |
4235b045 | 1423 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1424 | |
e92b85e1 MH |
1425 | /* Check tag and diename */ |
1426 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 1427 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 1428 | return DWARF_CB_OK; |
e92b85e1 | 1429 | |
7d21635a MH |
1430 | /* Check declared file */ |
1431 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
1432 | return DWARF_CB_OK; | |
1433 | ||
2a9c8c36 | 1434 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1435 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1436 | dwarf_decl_line(sp_die, &pf->lno); |
1437 | pf->lno += pp->line; | |
b55a87ad | 1438 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1439 | } else if (!dwarf_func_inline(sp_die)) { |
1440 | /* Real function */ | |
2a9c8c36 | 1441 | if (pp->lazy_line) |
b55a87ad | 1442 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1443 | else { |
b55a87ad | 1444 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
1445 | pr_warning("Failed to get entry address of " |
1446 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1447 | param->retval = -ENOENT; |
1448 | return DWARF_CB_ABORT; | |
1449 | } | |
2a9c8c36 MH |
1450 | pf->addr += pp->offset; |
1451 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1452 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1453 | } |
b55a87ad MH |
1454 | } else { |
1455 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1456 | .retval = 0}; | |
e92b85e1 | 1457 | /* Inlined function: search instances */ |
b55a87ad MH |
1458 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1459 | &_param); | |
1460 | param->retval = _param.retval; | |
1461 | } | |
e92b85e1 | 1462 | |
b55a87ad | 1463 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1464 | } |
1465 | ||
b55a87ad | 1466 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1467 | { |
b55a87ad MH |
1468 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1469 | .retval = 0}; | |
1470 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1471 | return _param.retval; | |
4ea42b18 MH |
1472 | } |
1473 | ||
cd25f8bc LM |
1474 | struct pubname_callback_param { |
1475 | char *function; | |
1476 | char *file; | |
1477 | Dwarf_Die *cu_die; | |
1478 | Dwarf_Die *sp_die; | |
1479 | int found; | |
1480 | }; | |
1481 | ||
1482 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1483 | { | |
1484 | struct pubname_callback_param *param = data; | |
1485 | ||
1486 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1487 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1488 | return DWARF_CB_OK; | |
1489 | ||
1490 | if (die_compare_name(param->sp_die, param->function)) { | |
1491 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) | |
1492 | return DWARF_CB_OK; | |
1493 | ||
1494 | if (param->file && | |
1495 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1496 | return DWARF_CB_OK; | |
1497 | ||
1498 | param->found = 1; | |
1499 | return DWARF_CB_ABORT; | |
1500 | } | |
1501 | } | |
1502 | ||
1503 | return DWARF_CB_OK; | |
1504 | } | |
1505 | ||
cf6eb489 MH |
1506 | /* Find probe points from debuginfo */ |
1507 | static int find_probes(int fd, struct probe_finder *pf) | |
4ea42b18 | 1508 | { |
cf6eb489 | 1509 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1510 | Dwarf_Off off, noff; |
1511 | size_t cuhl; | |
1512 | Dwarf_Die *diep; | |
469b9b88 MH |
1513 | Dwarf *dbg = NULL; |
1514 | Dwfl *dwfl; | |
1515 | Dwarf_Addr bias; /* Currently ignored */ | |
b55a87ad | 1516 | int ret = 0; |
804b3606 | 1517 | |
469b9b88 | 1518 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1519 | if (!dbg) { |
0e43e5d2 | 1520 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad | 1521 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
f0c4801a | 1522 | close(fd); /* Without dwfl_end(), fd isn't closed. */ |
b55a87ad MH |
1523 | return -EBADF; |
1524 | } | |
4ea42b18 | 1525 | |
7752f1b0 | 1526 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1527 | /* Get the call frame information from this dwarf */ |
cf6eb489 | 1528 | pf->cfi = dwarf_getcfi(dbg); |
7752f1b0 | 1529 | #endif |
a34a9854 | 1530 | |
804b3606 | 1531 | off = 0; |
cf6eb489 | 1532 | line_list__init(&pf->lcache); |
cd25f8bc LM |
1533 | |
1534 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
1535 | if (pp->function) { | |
1536 | struct pubname_callback_param pubname_param = { | |
1537 | .function = pp->function, | |
1538 | .file = pp->file, | |
1539 | .cu_die = &pf->cu_die, | |
1540 | .sp_die = &pf->sp_die, | |
2b348a77 | 1541 | .found = 0, |
cd25f8bc LM |
1542 | }; |
1543 | struct dwarf_callback_param probe_param = { | |
1544 | .data = pf, | |
1545 | }; | |
1546 | ||
1547 | dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0); | |
1548 | if (pubname_param.found) { | |
1549 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1550 | if (ret) | |
1551 | goto found; | |
1552 | } | |
1553 | } | |
1554 | ||
804b3606 | 1555 | /* Loop on CUs (Compilation Unit) */ |
8635bf6e | 1556 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1557 | /* Get the DIE(Debugging Information Entry) of this CU */ |
cf6eb489 | 1558 | diep = dwarf_offdie(dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1559 | if (!diep) |
1560 | continue; | |
4ea42b18 MH |
1561 | |
1562 | /* Check if target file is included. */ | |
1563 | if (pp->file) | |
cf6eb489 | 1564 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1565 | else |
cf6eb489 | 1566 | pf->fname = NULL; |
4ea42b18 | 1567 | |
cf6eb489 | 1568 | if (!pp->file || pf->fname) { |
4ea42b18 | 1569 | if (pp->function) |
cf6eb489 | 1570 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1571 | else if (pp->lazy_line) |
cf6eb489 | 1572 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1573 | else { |
cf6eb489 MH |
1574 | pf->lno = pp->line; |
1575 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1576 | } |
8635bf6e | 1577 | if (ret < 0) |
fbee632d | 1578 | break; |
4ea42b18 | 1579 | } |
804b3606 | 1580 | off = noff; |
4ea42b18 | 1581 | } |
cd25f8bc LM |
1582 | |
1583 | found: | |
cf6eb489 | 1584 | line_list__free(&pf->lcache); |
469b9b88 MH |
1585 | if (dwfl) |
1586 | dwfl_end(dwfl); | |
4ea42b18 | 1587 | |
cf6eb489 MH |
1588 | return ret; |
1589 | } | |
1590 | ||
1591 | /* Add a found probe point into trace event list */ | |
1592 | static int add_probe_trace_event(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1593 | { | |
1594 | struct trace_event_finder *tf = | |
1595 | container_of(pf, struct trace_event_finder, pf); | |
1596 | struct probe_trace_event *tev; | |
1597 | int ret, i; | |
1598 | ||
1599 | /* Check number of tevs */ | |
1600 | if (tf->ntevs == tf->max_tevs) { | |
1601 | pr_warning("Too many( > %d) probe point found.\n", | |
1602 | tf->max_tevs); | |
1603 | return -ERANGE; | |
1604 | } | |
1605 | tev = &tf->tevs[tf->ntevs++]; | |
1606 | ||
1607 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1608 | &tev->point); | |
1609 | if (ret < 0) | |
1610 | return ret; | |
1611 | ||
1612 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1613 | tev->point.offset); | |
1614 | ||
1615 | /* Find each argument */ | |
1616 | tev->nargs = pf->pev->nargs; | |
1617 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1618 | if (tev->args == NULL) | |
1619 | return -ENOMEM; | |
1620 | for (i = 0; i < pf->pev->nargs; i++) { | |
1621 | pf->pvar = &pf->pev->args[i]; | |
1622 | pf->tvar = &tev->args[i]; | |
1623 | ret = find_variable(sp_die, pf); | |
1624 | if (ret != 0) | |
1625 | return ret; | |
1626 | } | |
1627 | ||
1628 | return 0; | |
1629 | } | |
1630 | ||
1631 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
1632 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1633 | struct probe_trace_event **tevs, int max_tevs) | |
1634 | { | |
1635 | struct trace_event_finder tf = { | |
1636 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1637 | .max_tevs = max_tevs}; | |
1638 | int ret; | |
1639 | ||
1640 | /* Allocate result tevs array */ | |
1641 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1642 | if (*tevs == NULL) | |
1643 | return -ENOMEM; | |
1644 | ||
1645 | tf.tevs = *tevs; | |
1646 | tf.ntevs = 0; | |
1647 | ||
1648 | ret = find_probes(fd, &tf.pf); | |
1649 | if (ret < 0) { | |
1650 | free(*tevs); | |
1651 | *tevs = NULL; | |
1652 | return ret; | |
1653 | } | |
1654 | ||
1655 | return (ret < 0) ? ret : tf.ntevs; | |
1656 | } | |
1657 | ||
1658 | #define MAX_VAR_LEN 64 | |
1659 | ||
1660 | /* Collect available variables in this scope */ | |
1661 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1662 | { | |
1663 | struct available_var_finder *af = data; | |
1664 | struct variable_list *vl; | |
1665 | char buf[MAX_VAR_LEN]; | |
1666 | int tag, ret; | |
1667 | ||
1668 | vl = &af->vls[af->nvls - 1]; | |
1669 | ||
1670 | tag = dwarf_tag(die_mem); | |
1671 | if (tag == DW_TAG_formal_parameter || | |
1672 | tag == DW_TAG_variable) { | |
1673 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1674 | af->pf.fb_ops, NULL); | |
1675 | if (ret == 0) { | |
1676 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1677 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1678 | if (ret > 0) |
1679 | strlist__add(vl->vars, buf); | |
1680 | } | |
1681 | } | |
1682 | ||
fb8c5a56 | 1683 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1684 | return DIE_FIND_CB_CONTINUE; |
1685 | else | |
1686 | return DIE_FIND_CB_SIBLING; | |
1687 | } | |
1688 | ||
1689 | /* Add a found vars into available variables list */ | |
1690 | static int add_available_vars(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1691 | { | |
1692 | struct available_var_finder *af = | |
1693 | container_of(pf, struct available_var_finder, pf); | |
1694 | struct variable_list *vl; | |
fb8c5a56 MH |
1695 | Dwarf_Die die_mem, *scopes = NULL; |
1696 | int ret, nscopes; | |
cf6eb489 MH |
1697 | |
1698 | /* Check number of tevs */ | |
1699 | if (af->nvls == af->max_vls) { | |
1700 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1701 | return -ERANGE; | |
1702 | } | |
1703 | vl = &af->vls[af->nvls++]; | |
1704 | ||
1705 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1706 | &vl->point); | |
1707 | if (ret < 0) | |
1708 | return ret; | |
1709 | ||
1710 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1711 | vl->point.offset); | |
1712 | ||
1713 | /* Find local variables */ | |
1714 | vl->vars = strlist__new(true, NULL); | |
1715 | if (vl->vars == NULL) | |
1716 | return -ENOMEM; | |
fb8c5a56 | 1717 | af->child = true; |
cf6eb489 MH |
1718 | die_find_child(sp_die, collect_variables_cb, (void *)af, &die_mem); |
1719 | ||
fb8c5a56 MH |
1720 | /* Find external variables */ |
1721 | if (!af->externs) | |
1722 | goto out; | |
1723 | /* Don't need to search child DIE for externs. */ | |
1724 | af->child = false; | |
1725 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
1726 | while (nscopes-- > 1) | |
1727 | die_find_child(&scopes[nscopes], collect_variables_cb, | |
1728 | (void *)af, &die_mem); | |
1729 | if (scopes) | |
1730 | free(scopes); | |
1731 | ||
1732 | out: | |
cf6eb489 MH |
1733 | if (strlist__empty(vl->vars)) { |
1734 | strlist__delete(vl->vars); | |
1735 | vl->vars = NULL; | |
1736 | } | |
1737 | ||
1738 | return ret; | |
1739 | } | |
1740 | ||
1741 | /* Find available variables at given probe point */ | |
1742 | int find_available_vars_at(int fd, struct perf_probe_event *pev, | |
fb8c5a56 MH |
1743 | struct variable_list **vls, int max_vls, |
1744 | bool externs) | |
cf6eb489 MH |
1745 | { |
1746 | struct available_var_finder af = { | |
1747 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1748 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1749 | int ret; |
1750 | ||
1751 | /* Allocate result vls array */ | |
1752 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1753 | if (*vls == NULL) | |
1754 | return -ENOMEM; | |
1755 | ||
1756 | af.vls = *vls; | |
1757 | af.nvls = 0; | |
1758 | ||
1759 | ret = find_probes(fd, &af.pf); | |
1760 | if (ret < 0) { | |
1761 | /* Free vlist for error */ | |
1762 | while (af.nvls--) { | |
1763 | if (af.vls[af.nvls].point.symbol) | |
1764 | free(af.vls[af.nvls].point.symbol); | |
1765 | if (af.vls[af.nvls].vars) | |
1766 | strlist__delete(af.vls[af.nvls].vars); | |
1767 | } | |
1768 | free(af.vls); | |
1769 | *vls = NULL; | |
1770 | return ret; | |
1771 | } | |
1772 | ||
1773 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1774 | } |
1775 | ||
fb1587d8 | 1776 | /* Reverse search */ |
469b9b88 | 1777 | int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt) |
fb1587d8 MH |
1778 | { |
1779 | Dwarf_Die cudie, spdie, indie; | |
469b9b88 MH |
1780 | Dwarf *dbg = NULL; |
1781 | Dwfl *dwfl = NULL; | |
1d46ea2a MH |
1782 | Dwarf_Addr _addr, baseaddr, bias = 0; |
1783 | const char *fname = NULL, *func = NULL, *tmp; | |
1784 | int baseline = 0, lineno = 0, ret = 0; | |
fb1587d8 | 1785 | |
469b9b88 MH |
1786 | /* Open the live linux kernel */ |
1787 | dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias); | |
1788 | if (!dbg) { | |
0e43e5d2 | 1789 | pr_warning("No debug information found in the vmlinux - " |
469b9b88 MH |
1790 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1791 | ret = -EINVAL; | |
1792 | goto end; | |
1793 | } | |
fb1587d8 | 1794 | |
469b9b88 MH |
1795 | /* Adjust address with bias */ |
1796 | addr += bias; | |
fb1587d8 | 1797 | /* Find cu die */ |
469b9b88 | 1798 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) { |
0e43e5d2 MH |
1799 | pr_warning("Failed to find debug information for address %lx\n", |
1800 | addr); | |
75ec5a24 MH |
1801 | ret = -EINVAL; |
1802 | goto end; | |
1803 | } | |
fb1587d8 | 1804 | |
1d46ea2a MH |
1805 | /* Find a corresponding line (filename and lineno) */ |
1806 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1807 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1808 | |
1d46ea2a | 1809 | /* Find a corresponding function (name, baseline and baseaddr) */ |
fb1587d8 | 1810 | if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1811 | /* Get function entry information */ |
fb1587d8 | 1812 | tmp = dwarf_diename(&spdie); |
1d46ea2a MH |
1813 | if (!tmp || |
1814 | dwarf_entrypc(&spdie, &baseaddr) != 0 || | |
1815 | dwarf_decl_line(&spdie, &baseline) != 0) | |
1816 | goto post; | |
1817 | func = tmp; | |
1818 | ||
1819 | if (addr == (unsigned long)baseaddr) | |
1820 | /* Function entry - Relative line number is 0 */ | |
1821 | lineno = baseline; | |
1822 | else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1823 | &indie)) { | |
1824 | if (dwarf_entrypc(&indie, &_addr) == 0 && | |
1825 | _addr == addr) | |
1826 | /* | |
1827 | * addr is at an inline function entry. | |
1828 | * In this case, lineno should be the call-site | |
1829 | * line number. | |
1830 | */ | |
1831 | lineno = die_get_call_lineno(&indie); | |
1832 | else { | |
1833 | /* | |
1834 | * addr is in an inline function body. | |
1835 | * Since lineno points one of the lines | |
1836 | * of the inline function, baseline should | |
1837 | * be the entry line of the inline function. | |
1838 | */ | |
b55a87ad | 1839 | tmp = dwarf_diename(&indie); |
1d46ea2a MH |
1840 | if (tmp && |
1841 | dwarf_decl_line(&spdie, &baseline) == 0) | |
1842 | func = tmp; | |
b55a87ad | 1843 | } |
fb1587d8 | 1844 | } |
1d46ea2a MH |
1845 | } |
1846 | ||
1847 | post: | |
1848 | /* Make a relative line number or an offset */ | |
1849 | if (lineno) | |
1850 | ppt->line = lineno - baseline; | |
1851 | else if (func) | |
1852 | ppt->offset = addr - (unsigned long)baseaddr; | |
1853 | ||
1854 | /* Duplicate strings */ | |
1855 | if (func) { | |
1856 | ppt->function = strdup(func); | |
02b95dad MH |
1857 | if (ppt->function == NULL) { |
1858 | ret = -ENOMEM; | |
1859 | goto end; | |
1860 | } | |
fb1587d8 | 1861 | } |
1d46ea2a MH |
1862 | if (fname) { |
1863 | ppt->file = strdup(fname); | |
1864 | if (ppt->file == NULL) { | |
1865 | if (ppt->function) { | |
1866 | free(ppt->function); | |
1867 | ppt->function = NULL; | |
1868 | } | |
1869 | ret = -ENOMEM; | |
1870 | goto end; | |
1871 | } | |
1872 | } | |
fb1587d8 | 1873 | end: |
469b9b88 MH |
1874 | if (dwfl) |
1875 | dwfl_end(dwfl); | |
1d46ea2a MH |
1876 | if (ret == 0 && (fname || func)) |
1877 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1878 | return ret; |
1879 | } | |
1880 | ||
f6c903f5 MH |
1881 | /* Add a line and store the src path */ |
1882 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1883 | struct line_range *lr) | |
1884 | { | |
7cf0b79e | 1885 | /* Copy source path */ |
f6c903f5 | 1886 | if (!lr->path) { |
7cf0b79e MH |
1887 | lr->path = strdup(src); |
1888 | if (lr->path == NULL) | |
1889 | return -ENOMEM; | |
f6c903f5 MH |
1890 | } |
1891 | return line_list__add_line(&lr->line_list, lineno); | |
1892 | } | |
1893 | ||
4cc9cec6 MH |
1894 | static int line_range_walk_cb(const char *fname, int lineno, |
1895 | Dwarf_Addr addr __used, | |
1896 | void *data) | |
f6c903f5 | 1897 | { |
4cc9cec6 | 1898 | struct line_finder *lf = data; |
f6c903f5 | 1899 | |
4cc9cec6 | 1900 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1901 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1902 | return 0; |
f6c903f5 | 1903 | |
4cc9cec6 MH |
1904 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1905 | return -EINVAL; | |
f6c903f5 | 1906 | |
4cc9cec6 | 1907 | return 0; |
f6c903f5 | 1908 | } |
fb1587d8 | 1909 | |
631c9def | 1910 | /* Find line range from its line number */ |
b55a87ad | 1911 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1912 | { |
4cc9cec6 | 1913 | int ret; |
f6c903f5 | 1914 | |
4cc9cec6 | 1915 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1916 | |
804b3606 | 1917 | /* Update status */ |
f6c903f5 MH |
1918 | if (ret >= 0) |
1919 | if (!list_empty(&lf->lr->line_list)) | |
1920 | ret = lf->found = 1; | |
1921 | else | |
1922 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1923 | else { |
1924 | free(lf->lr->path); | |
1925 | lf->lr->path = NULL; | |
1926 | } | |
f6c903f5 | 1927 | return ret; |
631c9def MH |
1928 | } |
1929 | ||
161a26b0 MH |
1930 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1931 | { | |
b55a87ad MH |
1932 | struct dwarf_callback_param *param = data; |
1933 | ||
1934 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1935 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1936 | } | |
1937 | ||
631c9def | 1938 | /* Search function from function name */ |
e92b85e1 | 1939 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1940 | { |
b55a87ad MH |
1941 | struct dwarf_callback_param *param = data; |
1942 | struct line_finder *lf = param->data; | |
631c9def | 1943 | struct line_range *lr = lf->lr; |
631c9def | 1944 | |
7d21635a MH |
1945 | /* Check declared file */ |
1946 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1947 | return DWARF_CB_OK; | |
1948 | ||
e92b85e1 | 1949 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1950 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1951 | lf->fname = dwarf_decl_file(sp_die); |
1952 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1953 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1954 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1955 | if (lf->lno_s < 0) /* Overflow */ |
1956 | lf->lno_s = INT_MAX; | |
1957 | lf->lno_e = lr->offset + lr->end; | |
1958 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1959 | lf->lno_e = INT_MAX; |
d3b63d7a | 1960 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1961 | lr->start = lf->lno_s; |
1962 | lr->end = lf->lno_e; | |
b55a87ad MH |
1963 | if (dwarf_func_inline(sp_die)) { |
1964 | struct dwarf_callback_param _param; | |
1965 | _param.data = (void *)lf; | |
1966 | _param.retval = 0; | |
161a26b0 | 1967 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1968 | line_range_inline_cb, |
1969 | &_param); | |
1970 | param->retval = _param.retval; | |
1971 | } else | |
1972 | param->retval = find_line_range_by_line(sp_die, lf); | |
1973 | return DWARF_CB_ABORT; | |
631c9def | 1974 | } |
b55a87ad | 1975 | return DWARF_CB_OK; |
631c9def MH |
1976 | } |
1977 | ||
b55a87ad | 1978 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1979 | { |
b55a87ad MH |
1980 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1981 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1982 | return param.retval; | |
631c9def MH |
1983 | } |
1984 | ||
1985 | int find_line_range(int fd, struct line_range *lr) | |
1986 | { | |
804b3606 | 1987 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1988 | int ret = 0; |
804b3606 MH |
1989 | Dwarf_Off off = 0, noff; |
1990 | size_t cuhl; | |
1991 | Dwarf_Die *diep; | |
469b9b88 MH |
1992 | Dwarf *dbg = NULL; |
1993 | Dwfl *dwfl; | |
1994 | Dwarf_Addr bias; /* Currently ignored */ | |
6a330a3c | 1995 | const char *comp_dir; |
804b3606 | 1996 | |
469b9b88 | 1997 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1998 | if (!dbg) { |
0e43e5d2 | 1999 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad | 2000 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
f0c4801a | 2001 | close(fd); /* Without dwfl_end(), fd isn't closed. */ |
b55a87ad MH |
2002 | return -EBADF; |
2003 | } | |
631c9def | 2004 | |
cd25f8bc LM |
2005 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
2006 | if (lr->function) { | |
2007 | struct pubname_callback_param pubname_param = { | |
2008 | .function = lr->function, .file = lr->file, | |
2009 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
2010 | struct dwarf_callback_param line_range_param = { | |
2011 | .data = (void *)&lf, .retval = 0}; | |
2012 | ||
2013 | dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0); | |
2014 | if (pubname_param.found) { | |
2015 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
2016 | if (lf.found) | |
2017 | goto found; | |
2018 | } | |
2019 | } | |
2020 | ||
804b3606 | 2021 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
2022 | while (!lf.found && ret >= 0) { |
2023 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
2024 | break; |
2025 | ||
2026 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
2027 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
2028 | if (!diep) | |
2029 | continue; | |
631c9def MH |
2030 | |
2031 | /* Check if target file is included. */ | |
2032 | if (lr->file) | |
2a9c8c36 | 2033 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 2034 | else |
2a9c8c36 | 2035 | lf.fname = 0; |
631c9def | 2036 | |
2a9c8c36 | 2037 | if (!lr->file || lf.fname) { |
631c9def | 2038 | if (lr->function) |
b55a87ad | 2039 | ret = find_line_range_by_func(&lf); |
631c9def MH |
2040 | else { |
2041 | lf.lno_s = lr->start; | |
d3b63d7a | 2042 | lf.lno_e = lr->end; |
b55a87ad | 2043 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 2044 | } |
631c9def | 2045 | } |
804b3606 | 2046 | off = noff; |
631c9def | 2047 | } |
6a330a3c | 2048 | |
cd25f8bc | 2049 | found: |
6a330a3c MH |
2050 | /* Store comp_dir */ |
2051 | if (lf.found) { | |
2052 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
2053 | if (comp_dir) { | |
2054 | lr->comp_dir = strdup(comp_dir); | |
2055 | if (!lr->comp_dir) | |
2056 | ret = -ENOMEM; | |
2057 | } | |
2058 | } | |
2059 | ||
7cf0b79e | 2060 | pr_debug("path: %s\n", lr->path); |
469b9b88 | 2061 | dwfl_end(dwfl); |
b55a87ad | 2062 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
2063 | } |
2064 |