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