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 | |
89c69c0e MH |
36 | #include "event.h" |
37 | #include "debug.h" | |
074fc0e4 | 38 | #include "util.h" |
9ed7e1b8 | 39 | #include "symbol.h" |
4ea42b18 MH |
40 | #include "probe-finder.h" |
41 | ||
4984912e MH |
42 | /* Kprobe tracer basic type is up to u64 */ |
43 | #define MAX_BASIC_TYPE_BITS 64 | |
44 | ||
4ea42b18 MH |
45 | /* |
46 | * Compare the tail of two strings. | |
47 | * Return 0 if whole of either string is same as another's tail part. | |
48 | */ | |
49 | static int strtailcmp(const char *s1, const char *s2) | |
50 | { | |
51 | int i1 = strlen(s1); | |
52 | int i2 = strlen(s2); | |
d56728b8 | 53 | while (--i1 >= 0 && --i2 >= 0) { |
4ea42b18 MH |
54 | if (s1[i1] != s2[i2]) |
55 | return s1[i1] - s2[i2]; | |
56 | } | |
57 | return 0; | |
58 | } | |
59 | ||
2a9c8c36 MH |
60 | /* Line number list operations */ |
61 | ||
62 | /* Add a line to line number list */ | |
d3b63d7a | 63 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
64 | { |
65 | struct line_node *ln; | |
66 | struct list_head *p; | |
67 | ||
68 | /* Reverse search, because new line will be the last one */ | |
69 | list_for_each_entry_reverse(ln, head, list) { | |
70 | if (ln->line < line) { | |
71 | p = &ln->list; | |
72 | goto found; | |
73 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 74 | return 1; |
2a9c8c36 MH |
75 | } |
76 | /* List is empty, or the smallest entry */ | |
77 | p = head; | |
78 | found: | |
79 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
80 | ln = zalloc(sizeof(struct line_node)); |
81 | if (ln == NULL) | |
82 | return -ENOMEM; | |
2a9c8c36 MH |
83 | ln->line = line; |
84 | INIT_LIST_HEAD(&ln->list); | |
85 | list_add(&ln->list, p); | |
e334016f | 86 | return 0; |
2a9c8c36 MH |
87 | } |
88 | ||
89 | /* Check if the line in line number list */ | |
d3b63d7a | 90 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
91 | { |
92 | struct line_node *ln; | |
93 | ||
94 | /* Reverse search, because new line will be the last one */ | |
95 | list_for_each_entry(ln, head, list) | |
96 | if (ln->line == line) | |
97 | return 1; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | /* Init line number list */ | |
103 | static void line_list__init(struct list_head *head) | |
104 | { | |
105 | INIT_LIST_HEAD(head); | |
106 | } | |
107 | ||
108 | /* Free line number list */ | |
109 | static void line_list__free(struct list_head *head) | |
110 | { | |
111 | struct line_node *ln; | |
112 | while (!list_empty(head)) { | |
113 | ln = list_first_entry(head, struct line_node, list); | |
114 | list_del(&ln->list); | |
115 | free(ln); | |
116 | } | |
117 | } | |
118 | ||
469b9b88 | 119 | /* Dwarf FL wrappers */ |
469b9b88 MH |
120 | static char *debuginfo_path; /* Currently dummy */ |
121 | ||
122 | static const Dwfl_Callbacks offline_callbacks = { | |
123 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
124 | .debuginfo_path = &debuginfo_path, | |
125 | ||
126 | .section_address = dwfl_offline_section_address, | |
127 | ||
128 | /* We use this table for core files too. */ | |
129 | .find_elf = dwfl_build_id_find_elf, | |
130 | }; | |
131 | ||
469b9b88 MH |
132 | /* Get a Dwarf from offline image */ |
133 | static Dwarf *dwfl_init_offline_dwarf(int fd, Dwfl **dwflp, Dwarf_Addr *bias) | |
134 | { | |
135 | Dwfl_Module *mod; | |
136 | Dwarf *dbg = NULL; | |
137 | ||
138 | if (!dwflp) | |
139 | return NULL; | |
140 | ||
141 | *dwflp = dwfl_begin(&offline_callbacks); | |
142 | if (!*dwflp) | |
143 | return NULL; | |
144 | ||
145 | mod = dwfl_report_offline(*dwflp, "", "", fd); | |
146 | if (!mod) | |
147 | goto error; | |
148 | ||
149 | dbg = dwfl_module_getdwarf(mod, bias); | |
150 | if (!dbg) { | |
151 | error: | |
152 | dwfl_end(*dwflp); | |
153 | *dwflp = NULL; | |
154 | } | |
155 | return dbg; | |
156 | } | |
157 | ||
3b4694de MH |
158 | #if _ELFUTILS_PREREQ(0, 148) |
159 | /* This method is buggy if elfutils is older than 0.148 */ | |
160 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
161 | void **userdata, | |
162 | const char *module_name, | |
163 | Dwarf_Addr base, | |
164 | char **file_name, Elf **elfp) | |
165 | { | |
166 | int fd; | |
167 | const char *path = kernel_get_module_path(module_name); | |
168 | ||
169 | pr_debug2("Use file %s for %s\n", path, module_name); | |
170 | if (path) { | |
171 | fd = open(path, O_RDONLY); | |
172 | if (fd >= 0) { | |
173 | *file_name = strdup(path); | |
174 | return fd; | |
175 | } | |
176 | } | |
177 | /* If failed, try to call standard method */ | |
178 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
179 | file_name, elfp); | |
180 | } | |
181 | ||
182 | static const Dwfl_Callbacks kernel_callbacks = { | |
183 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
184 | .debuginfo_path = &debuginfo_path, | |
185 | ||
186 | .find_elf = __linux_kernel_find_elf, | |
187 | .section_address = dwfl_linux_kernel_module_section_address, | |
188 | }; | |
189 | ||
469b9b88 MH |
190 | /* Get a Dwarf from live kernel image */ |
191 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr, Dwfl **dwflp, | |
192 | Dwarf_Addr *bias) | |
193 | { | |
194 | Dwarf *dbg; | |
195 | ||
196 | if (!dwflp) | |
197 | return NULL; | |
198 | ||
199 | *dwflp = dwfl_begin(&kernel_callbacks); | |
200 | if (!*dwflp) | |
201 | return NULL; | |
202 | ||
203 | /* Load the kernel dwarves: Don't care the result here */ | |
204 | dwfl_linux_kernel_report_kernel(*dwflp); | |
205 | dwfl_linux_kernel_report_modules(*dwflp); | |
206 | ||
207 | dbg = dwfl_addrdwarf(*dwflp, addr, bias); | |
208 | /* Here, check whether we could get a real dwarf */ | |
209 | if (!dbg) { | |
3b4694de MH |
210 | pr_debug("Failed to find kernel dwarf at %lx\n", |
211 | (unsigned long)addr); | |
469b9b88 MH |
212 | dwfl_end(*dwflp); |
213 | *dwflp = NULL; | |
214 | } | |
215 | return dbg; | |
216 | } | |
3b4694de MH |
217 | #else |
218 | /* With older elfutils, this just support kernel module... */ | |
219 | static Dwarf *dwfl_init_live_kernel_dwarf(Dwarf_Addr addr __used, Dwfl **dwflp, | |
220 | Dwarf_Addr *bias) | |
221 | { | |
222 | int fd; | |
223 | const char *path = kernel_get_module_path("kernel"); | |
224 | ||
225 | if (!path) { | |
226 | pr_err("Failed to find vmlinux path\n"); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | pr_debug2("Use file %s for debuginfo\n", path); | |
231 | fd = open(path, O_RDONLY); | |
232 | if (fd < 0) | |
233 | return NULL; | |
234 | ||
235 | return dwfl_init_offline_dwarf(fd, dwflp, bias); | |
236 | } | |
237 | #endif | |
469b9b88 | 238 | |
2a9c8c36 MH |
239 | /* Dwarf wrappers */ |
240 | ||
241 | /* Find the realpath of the target file. */ | |
242 | static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) | |
4ea42b18 | 243 | { |
804b3606 MH |
244 | Dwarf_Files *files; |
245 | size_t nfiles, i; | |
accd3cc4 | 246 | const char *src = NULL; |
4ea42b18 MH |
247 | int ret; |
248 | ||
249 | if (!fname) | |
2a9c8c36 | 250 | return NULL; |
4ea42b18 | 251 | |
804b3606 | 252 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
2a9c8c36 MH |
253 | if (ret != 0) |
254 | return NULL; | |
255 | ||
256 | for (i = 0; i < nfiles; i++) { | |
257 | src = dwarf_filesrc(files, i, NULL, NULL); | |
258 | if (strtailcmp(src, fname) == 0) | |
259 | break; | |
4ea42b18 | 260 | } |
c9e38582 MH |
261 | if (i == nfiles) |
262 | return NULL; | |
2a9c8c36 | 263 | return src; |
4ea42b18 MH |
264 | } |
265 | ||
6a330a3c MH |
266 | /* Get DW_AT_comp_dir (should be NULL with older gcc) */ |
267 | static const char *cu_get_comp_dir(Dwarf_Die *cu_die) | |
268 | { | |
269 | Dwarf_Attribute attr; | |
270 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) | |
271 | return NULL; | |
272 | return dwarf_formstring(&attr); | |
273 | } | |
274 | ||
016f262e MH |
275 | /* Compare diename and tname */ |
276 | static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) | |
277 | { | |
278 | const char *name; | |
279 | name = dwarf_diename(dw_die); | |
82175633 | 280 | return name ? (strcmp(tname, name) == 0) : false; |
016f262e MH |
281 | } |
282 | ||
4046b8bb MH |
283 | /* Get type die */ |
284 | static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
285 | { | |
286 | Dwarf_Attribute attr; | |
287 | ||
288 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && | |
289 | dwarf_formref_die(&attr, die_mem)) | |
290 | return die_mem; | |
291 | else | |
292 | return NULL; | |
293 | } | |
294 | ||
cf6eb489 MH |
295 | /* Get a type die, but skip qualifiers */ |
296 | static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
7df2f329 | 297 | { |
7df2f329 MH |
298 | int tag; |
299 | ||
300 | do { | |
4046b8bb MH |
301 | vr_die = die_get_type(vr_die, die_mem); |
302 | if (!vr_die) | |
303 | break; | |
304 | tag = dwarf_tag(vr_die); | |
7df2f329 MH |
305 | } while (tag == DW_TAG_const_type || |
306 | tag == DW_TAG_restrict_type || | |
307 | tag == DW_TAG_volatile_type || | |
cf6eb489 MH |
308 | tag == DW_TAG_shared_type); |
309 | ||
310 | return vr_die; | |
311 | } | |
312 | ||
313 | /* Get a type die, but skip qualifiers and typedef */ | |
314 | static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
315 | { | |
316 | do { | |
317 | vr_die = __die_get_real_type(vr_die, die_mem); | |
318 | } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); | |
7df2f329 | 319 | |
4046b8bb | 320 | return vr_die; |
7df2f329 MH |
321 | } |
322 | ||
4984912e MH |
323 | static bool die_is_signed_type(Dwarf_Die *tp_die) |
324 | { | |
325 | Dwarf_Attribute attr; | |
326 | Dwarf_Word ret; | |
327 | ||
328 | if (dwarf_attr(tp_die, DW_AT_encoding, &attr) == NULL || | |
329 | dwarf_formudata(&attr, &ret) != 0) | |
330 | return false; | |
331 | ||
332 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
333 | ret == DW_ATE_signed_fixed); | |
334 | } | |
335 | ||
336 | static int die_get_byte_size(Dwarf_Die *tp_die) | |
337 | { | |
338 | Dwarf_Attribute attr; | |
339 | Dwarf_Word ret; | |
340 | ||
341 | if (dwarf_attr(tp_die, DW_AT_byte_size, &attr) == NULL || | |
342 | dwarf_formudata(&attr, &ret) != 0) | |
343 | return 0; | |
344 | ||
345 | return (int)ret; | |
346 | } | |
347 | ||
de1439d8 MH |
348 | /* Get data_member_location offset */ |
349 | static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
350 | { | |
351 | Dwarf_Attribute attr; | |
352 | Dwarf_Op *expr; | |
353 | size_t nexpr; | |
354 | int ret; | |
355 | ||
356 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
357 | return -ENOENT; | |
358 | ||
359 | if (dwarf_formudata(&attr, offs) != 0) { | |
360 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
361 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
362 | if (ret < 0 || nexpr == 0) | |
363 | return -ENOENT; | |
364 | ||
365 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
366 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
367 | expr[0].atom, nexpr); | |
368 | return -ENOTSUP; | |
369 | } | |
370 | *offs = (Dwarf_Word)expr[0].number; | |
371 | } | |
372 | return 0; | |
373 | } | |
374 | ||
016f262e MH |
375 | /* Return values for die_find callbacks */ |
376 | enum { | |
377 | DIE_FIND_CB_FOUND = 0, /* End of Search */ | |
378 | DIE_FIND_CB_CHILD = 1, /* Search only children */ | |
379 | DIE_FIND_CB_SIBLING = 2, /* Search only siblings */ | |
380 | DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */ | |
381 | }; | |
382 | ||
383 | /* Search a child die */ | |
384 | static Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
385 | int (*callback)(Dwarf_Die *, void *), | |
386 | void *data, Dwarf_Die *die_mem) | |
387 | { | |
388 | Dwarf_Die child_die; | |
389 | int ret; | |
390 | ||
391 | ret = dwarf_child(rt_die, die_mem); | |
392 | if (ret != 0) | |
393 | return NULL; | |
394 | ||
395 | do { | |
396 | ret = callback(die_mem, data); | |
397 | if (ret == DIE_FIND_CB_FOUND) | |
398 | return die_mem; | |
399 | ||
400 | if ((ret & DIE_FIND_CB_CHILD) && | |
401 | die_find_child(die_mem, callback, data, &child_die)) { | |
402 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
403 | return die_mem; | |
404 | } | |
405 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
406 | dwarf_siblingof(die_mem, die_mem) == 0); | |
407 | ||
408 | return NULL; | |
409 | } | |
410 | ||
804b3606 MH |
411 | struct __addr_die_search_param { |
412 | Dwarf_Addr addr; | |
413 | Dwarf_Die *die_mem; | |
414 | }; | |
415 | ||
416 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
631c9def | 417 | { |
804b3606 | 418 | struct __addr_die_search_param *ad = data; |
631c9def | 419 | |
804b3606 MH |
420 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
421 | dwarf_haspc(fn_die, ad->addr)) { | |
422 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
423 | return DWARF_CB_ABORT; | |
424 | } | |
425 | return DWARF_CB_OK; | |
426 | } | |
631c9def | 427 | |
804b3606 | 428 | /* Search a real subprogram including this line, */ |
95a3e4c4 MH |
429 | static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
430 | Dwarf_Die *die_mem) | |
804b3606 MH |
431 | { |
432 | struct __addr_die_search_param ad; | |
433 | ad.addr = addr; | |
434 | ad.die_mem = die_mem; | |
435 | /* dwarf_getscopes can't find subprogram. */ | |
436 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
437 | return NULL; | |
438 | else | |
439 | return die_mem; | |
631c9def MH |
440 | } |
441 | ||
016f262e MH |
442 | /* die_find callback for inline function search */ |
443 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
161a26b0 | 444 | { |
016f262e | 445 | Dwarf_Addr *addr = data; |
161a26b0 | 446 | |
016f262e MH |
447 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
448 | dwarf_haspc(die_mem, *addr)) | |
449 | return DIE_FIND_CB_FOUND; | |
161a26b0 | 450 | |
016f262e | 451 | return DIE_FIND_CB_CONTINUE; |
161a26b0 MH |
452 | } |
453 | ||
016f262e MH |
454 | /* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ |
455 | static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
456 | Dwarf_Die *die_mem) | |
4ea42b18 | 457 | { |
016f262e | 458 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); |
4ea42b18 MH |
459 | } |
460 | ||
378eeaad MH |
461 | struct __find_variable_param { |
462 | const char *name; | |
463 | Dwarf_Addr addr; | |
464 | }; | |
465 | ||
016f262e | 466 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
4ea42b18 | 467 | { |
378eeaad | 468 | struct __find_variable_param *fvp = data; |
016f262e | 469 | int tag; |
4ea42b18 | 470 | |
016f262e MH |
471 | tag = dwarf_tag(die_mem); |
472 | if ((tag == DW_TAG_formal_parameter || | |
473 | tag == DW_TAG_variable) && | |
378eeaad | 474 | die_compare_name(die_mem, fvp->name)) |
016f262e MH |
475 | return DIE_FIND_CB_FOUND; |
476 | ||
378eeaad MH |
477 | if (dwarf_haspc(die_mem, fvp->addr)) |
478 | return DIE_FIND_CB_CONTINUE; | |
479 | else | |
480 | return DIE_FIND_CB_SIBLING; | |
4ea42b18 MH |
481 | } |
482 | ||
378eeaad MH |
483 | /* Find a variable called 'name' at given address */ |
484 | static Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, | |
485 | Dwarf_Addr addr, Dwarf_Die *die_mem) | |
4ea42b18 | 486 | { |
378eeaad MH |
487 | struct __find_variable_param fvp = { .name = name, .addr = addr}; |
488 | ||
489 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, | |
016f262e | 490 | die_mem); |
4ea42b18 MH |
491 | } |
492 | ||
7df2f329 MH |
493 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
494 | { | |
495 | const char *name = data; | |
496 | ||
497 | if ((dwarf_tag(die_mem) == DW_TAG_member) && | |
82175633 | 498 | die_compare_name(die_mem, name)) |
7df2f329 MH |
499 | return DIE_FIND_CB_FOUND; |
500 | ||
501 | return DIE_FIND_CB_SIBLING; | |
502 | } | |
503 | ||
504 | /* Find a member called 'name' */ | |
505 | static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
506 | Dwarf_Die *die_mem) | |
507 | { | |
508 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
509 | die_mem); | |
510 | } | |
511 | ||
cf6eb489 MH |
512 | /* Get the name of given variable DIE */ |
513 | static int die_get_typename(Dwarf_Die *vr_die, char *buf, int len) | |
514 | { | |
515 | Dwarf_Die type; | |
516 | int tag, ret, ret2; | |
517 | const char *tmp = ""; | |
518 | ||
519 | if (__die_get_real_type(vr_die, &type) == NULL) | |
520 | return -ENOENT; | |
521 | ||
522 | tag = dwarf_tag(&type); | |
523 | if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) | |
524 | tmp = "*"; | |
525 | else if (tag == DW_TAG_subroutine_type) { | |
526 | /* Function pointer */ | |
527 | ret = snprintf(buf, len, "(function_type)"); | |
528 | return (ret >= len) ? -E2BIG : ret; | |
529 | } else { | |
530 | if (!dwarf_diename(&type)) | |
531 | return -ENOENT; | |
532 | if (tag == DW_TAG_union_type) | |
533 | tmp = "union "; | |
534 | else if (tag == DW_TAG_structure_type) | |
535 | tmp = "struct "; | |
536 | /* Write a base name */ | |
537 | ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type)); | |
538 | return (ret >= len) ? -E2BIG : ret; | |
539 | } | |
540 | ret = die_get_typename(&type, buf, len); | |
541 | if (ret > 0) { | |
542 | ret2 = snprintf(buf + ret, len - ret, "%s", tmp); | |
543 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
544 | } | |
545 | return ret; | |
546 | } | |
547 | ||
548 | /* Get the name and type of given variable DIE, stored as "type\tname" */ | |
549 | static int die_get_varname(Dwarf_Die *vr_die, char *buf, int len) | |
550 | { | |
551 | int ret, ret2; | |
552 | ||
553 | ret = die_get_typename(vr_die, buf, len); | |
554 | if (ret < 0) { | |
555 | pr_debug("Failed to get type, make it unknown.\n"); | |
556 | ret = snprintf(buf, len, "(unknown_type)"); | |
557 | } | |
558 | if (ret > 0) { | |
559 | ret2 = snprintf(buf + ret, len - ret, "\t%s", | |
560 | dwarf_diename(vr_die)); | |
561 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
562 | } | |
563 | return ret; | |
564 | } | |
565 | ||
4ea42b18 MH |
566 | /* |
567 | * Probe finder related functions | |
568 | */ | |
569 | ||
0e60836b | 570 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 571 | { |
0e60836b SD |
572 | struct probe_trace_arg_ref *ref; |
573 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
574 | if (ref != NULL) |
575 | ref->offset = offs; | |
576 | return ref; | |
577 | } | |
578 | ||
cf6eb489 MH |
579 | /* |
580 | * Convert a location into trace_arg. | |
581 | * If tvar == NULL, this just checks variable can be converted. | |
582 | */ | |
583 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
584 | Dwarf_Op *fb_ops, | |
585 | struct probe_trace_arg *tvar) | |
4ea42b18 | 586 | { |
b7dcb857 MH |
587 | Dwarf_Attribute attr; |
588 | Dwarf_Op *op; | |
589 | size_t nops; | |
804b3606 MH |
590 | unsigned int regn; |
591 | Dwarf_Word offs = 0; | |
4235b045 | 592 | bool ref = false; |
4ea42b18 | 593 | const char *regs; |
b7dcb857 MH |
594 | int ret; |
595 | ||
632941c4 MH |
596 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
597 | goto static_var; | |
598 | ||
b7dcb857 MH |
599 | /* TODO: handle more than 1 exprs */ |
600 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 601 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
602 | nops == 0) { |
603 | /* TODO: Support const_value */ | |
b7dcb857 MH |
604 | return -ENOENT; |
605 | } | |
606 | ||
607 | if (op->atom == DW_OP_addr) { | |
632941c4 | 608 | static_var: |
cf6eb489 MH |
609 | if (!tvar) |
610 | return 0; | |
b7dcb857 MH |
611 | /* Static variables on memory (not stack), make @varname */ |
612 | ret = strlen(dwarf_diename(vr_die)); | |
613 | tvar->value = zalloc(ret + 2); | |
614 | if (tvar->value == NULL) | |
615 | return -ENOMEM; | |
616 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
617 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
618 | if (tvar->ref == NULL) | |
619 | return -ENOMEM; | |
620 | return 0; | |
621 | } | |
4ea42b18 | 622 | |
4ea42b18 | 623 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 624 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 625 | if (fb_ops == NULL) |
b55a87ad | 626 | return -ENOTSUP; |
4235b045 | 627 | ref = true; |
804b3606 | 628 | offs = op->number; |
cf6eb489 | 629 | op = &fb_ops[0]; |
804b3606 | 630 | } |
4ea42b18 | 631 | |
804b3606 MH |
632 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
633 | regn = op->atom - DW_OP_breg0; | |
634 | offs += op->number; | |
4235b045 | 635 | ref = true; |
804b3606 MH |
636 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
637 | regn = op->atom - DW_OP_reg0; | |
638 | } else if (op->atom == DW_OP_bregx) { | |
639 | regn = op->number; | |
640 | offs += op->number2; | |
4235b045 | 641 | ref = true; |
804b3606 MH |
642 | } else if (op->atom == DW_OP_regx) { |
643 | regn = op->number; | |
b55a87ad | 644 | } else { |
cf6eb489 | 645 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
646 | return -ENOTSUP; |
647 | } | |
4ea42b18 | 648 | |
cf6eb489 MH |
649 | if (!tvar) |
650 | return 0; | |
651 | ||
4ea42b18 | 652 | regs = get_arch_regstr(regn); |
b55a87ad | 653 | if (!regs) { |
cf6eb489 | 654 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
655 | pr_warning("Mapping for the register number %u " |
656 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
657 | return -ERANGE; |
658 | } | |
4ea42b18 | 659 | |
02b95dad MH |
660 | tvar->value = strdup(regs); |
661 | if (tvar->value == NULL) | |
662 | return -ENOMEM; | |
663 | ||
4235b045 | 664 | if (ref) { |
b7dcb857 | 665 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
666 | if (tvar->ref == NULL) |
667 | return -ENOMEM; | |
4235b045 | 668 | } |
b55a87ad | 669 | return 0; |
4ea42b18 MH |
670 | } |
671 | ||
b55a87ad | 672 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 673 | struct probe_trace_arg *tvar, |
73317b95 | 674 | const char *cast) |
4984912e | 675 | { |
0e60836b | 676 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
677 | Dwarf_Die type; |
678 | char buf[16]; | |
679 | int ret; | |
680 | ||
73317b95 MH |
681 | /* TODO: check all types */ |
682 | if (cast && strcmp(cast, "string") != 0) { | |
683 | /* Non string type is OK */ | |
684 | tvar->type = strdup(cast); | |
685 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
686 | } | |
687 | ||
b55a87ad MH |
688 | if (die_get_real_type(vr_die, &type) == NULL) { |
689 | pr_warning("Failed to get a type information of %s.\n", | |
690 | dwarf_diename(vr_die)); | |
691 | return -ENOENT; | |
692 | } | |
4984912e | 693 | |
b2a3c12b MH |
694 | pr_debug("%s type is %s.\n", |
695 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
696 | ||
73317b95 MH |
697 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
698 | ret = dwarf_tag(&type); | |
699 | if (ret != DW_TAG_pointer_type && | |
700 | ret != DW_TAG_array_type) { | |
701 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 702 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
703 | dwarf_diename(vr_die), dwarf_diename(&type)); |
704 | return -EINVAL; | |
705 | } | |
706 | if (ret == DW_TAG_pointer_type) { | |
707 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
708 | pr_warning("Failed to get a type" |
709 | " information.\n"); | |
73317b95 MH |
710 | return -ENOENT; |
711 | } | |
712 | while (*ref_ptr) | |
713 | ref_ptr = &(*ref_ptr)->next; | |
714 | /* Add new reference with offset +0 */ | |
0e60836b | 715 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
716 | if (*ref_ptr == NULL) { |
717 | pr_warning("Out of memory error\n"); | |
718 | return -ENOMEM; | |
719 | } | |
720 | } | |
82175633 MH |
721 | if (!die_compare_name(&type, "char") && |
722 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 723 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 724 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
725 | dwarf_diename(vr_die)); |
726 | return -EINVAL; | |
727 | } | |
728 | tvar->type = strdup(cast); | |
729 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
730 | } | |
731 | ||
4984912e MH |
732 | ret = die_get_byte_size(&type) * 8; |
733 | if (ret) { | |
734 | /* Check the bitwidth */ | |
735 | if (ret > MAX_BASIC_TYPE_BITS) { | |
b55a87ad MH |
736 | pr_info("%s exceeds max-bitwidth." |
737 | " Cut down to %d bits.\n", | |
738 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
4984912e MH |
739 | ret = MAX_BASIC_TYPE_BITS; |
740 | } | |
741 | ||
742 | ret = snprintf(buf, 16, "%c%d", | |
743 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
b55a87ad MH |
744 | if (ret < 0 || ret >= 16) { |
745 | if (ret >= 16) | |
746 | ret = -E2BIG; | |
747 | pr_warning("Failed to convert variable type: %s\n", | |
748 | strerror(-ret)); | |
749 | return ret; | |
750 | } | |
73317b95 MH |
751 | tvar->type = strdup(buf); |
752 | if (tvar->type == NULL) | |
02b95dad | 753 | return -ENOMEM; |
4984912e | 754 | } |
b55a87ad | 755 | return 0; |
4984912e MH |
756 | } |
757 | ||
b55a87ad | 758 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 759 | struct perf_probe_arg_field *field, |
0e60836b | 760 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 761 | Dwarf_Die *die_mem) |
7df2f329 | 762 | { |
0e60836b | 763 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
764 | Dwarf_Die type; |
765 | Dwarf_Word offs; | |
b2a3c12b | 766 | int ret, tag; |
7df2f329 MH |
767 | |
768 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
769 | if (die_get_real_type(vr_die, &type) == NULL) { |
770 | pr_warning("Failed to get the type of %s.\n", varname); | |
771 | return -ENOENT; | |
772 | } | |
b2a3c12b MH |
773 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
774 | tag = dwarf_tag(&type); | |
775 | ||
776 | if (field->name[0] == '[' && | |
777 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
778 | if (field->next) | |
779 | /* Save original type for next field */ | |
780 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
781 | /* Get the type of this array */ | |
782 | if (die_get_real_type(&type, &type) == NULL) { | |
783 | pr_warning("Failed to get the type of %s.\n", varname); | |
784 | return -ENOENT; | |
785 | } | |
786 | pr_debug2("Array real type: (%x)\n", | |
787 | (unsigned)dwarf_dieoffset(&type)); | |
788 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 789 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
790 | if (ref == NULL) |
791 | return -ENOMEM; | |
792 | if (*ref_ptr) | |
793 | (*ref_ptr)->next = ref; | |
794 | else | |
795 | *ref_ptr = ref; | |
796 | } | |
797 | ref->offset += die_get_byte_size(&type) * field->index; | |
798 | if (!field->next) | |
799 | /* Save vr_die for converting types */ | |
800 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
801 | goto next; | |
802 | } else if (tag == DW_TAG_pointer_type) { | |
803 | /* Check the pointer and dereference */ | |
b55a87ad MH |
804 | if (!field->ref) { |
805 | pr_err("Semantic error: %s must be referred by '->'\n", | |
806 | field->name); | |
807 | return -EINVAL; | |
808 | } | |
7df2f329 | 809 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
810 | if (die_get_real_type(&type, &type) == NULL) { |
811 | pr_warning("Failed to get the type of %s.\n", varname); | |
812 | return -ENOENT; | |
813 | } | |
12e5a7ae | 814 | /* Verify it is a data structure */ |
b55a87ad MH |
815 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
816 | pr_warning("%s is not a data structure.\n", varname); | |
817 | return -EINVAL; | |
818 | } | |
12e5a7ae | 819 | |
0e60836b | 820 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
821 | if (ref == NULL) |
822 | return -ENOMEM; | |
7df2f329 MH |
823 | if (*ref_ptr) |
824 | (*ref_ptr)->next = ref; | |
825 | else | |
826 | *ref_ptr = ref; | |
827 | } else { | |
12e5a7ae | 828 | /* Verify it is a data structure */ |
b2a3c12b | 829 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
830 | pr_warning("%s is not a data structure.\n", varname); |
831 | return -EINVAL; | |
832 | } | |
b2a3c12b | 833 | if (field->name[0] == '[') { |
0e43e5d2 MH |
834 | pr_err("Semantic error: %s is not a pointor" |
835 | " nor array.\n", varname); | |
b2a3c12b MH |
836 | return -EINVAL; |
837 | } | |
b55a87ad MH |
838 | if (field->ref) { |
839 | pr_err("Semantic error: %s must be referred by '.'\n", | |
840 | field->name); | |
841 | return -EINVAL; | |
842 | } | |
843 | if (!ref) { | |
844 | pr_warning("Structure on a register is not " | |
845 | "supported yet.\n"); | |
846 | return -ENOTSUP; | |
847 | } | |
7df2f329 MH |
848 | } |
849 | ||
b55a87ad MH |
850 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
851 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
852 | dwarf_diename(&type), field->name); | |
853 | return -EINVAL; | |
854 | } | |
7df2f329 MH |
855 | |
856 | /* Get the offset of the field */ | |
de1439d8 MH |
857 | ret = die_get_data_member_location(die_mem, &offs); |
858 | if (ret < 0) { | |
b55a87ad | 859 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 860 | return ret; |
b55a87ad | 861 | } |
7df2f329 MH |
862 | ref->offset += (long)offs; |
863 | ||
b2a3c12b | 864 | next: |
7df2f329 MH |
865 | /* Converting next field */ |
866 | if (field->next) | |
b55a87ad | 867 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 868 | field->next, &ref, die_mem); |
b55a87ad MH |
869 | else |
870 | return 0; | |
7df2f329 MH |
871 | } |
872 | ||
4ea42b18 | 873 | /* Show a variables in kprobe event format */ |
b55a87ad | 874 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 875 | { |
4984912e | 876 | Dwarf_Die die_mem; |
4ea42b18 MH |
877 | int ret; |
878 | ||
b7dcb857 MH |
879 | pr_debug("Converting variable %s into trace event.\n", |
880 | dwarf_diename(vr_die)); | |
804b3606 | 881 | |
cf6eb489 MH |
882 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
883 | pf->tvar); | |
884 | if (ret == -ENOENT) | |
885 | pr_err("Failed to find the location of %s at this address.\n" | |
886 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
887 | else if (ret == -ENOTSUP) | |
888 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
889 | else if (pf->pvar->field) { | |
b55a87ad MH |
890 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
891 | pf->pvar->field, &pf->tvar->ref, | |
892 | &die_mem); | |
4984912e MH |
893 | vr_die = &die_mem; |
894 | } | |
73317b95 MH |
895 | if (ret == 0) |
896 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 897 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 898 | return ret; |
4ea42b18 MH |
899 | } |
900 | ||
4ea42b18 | 901 | /* Find a variable in a subprogram die */ |
b55a87ad | 902 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 903 | { |
b7dcb857 | 904 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 905 | char buf[32], *ptr; |
b7dcb857 | 906 | int ret, nscopes; |
4ea42b18 | 907 | |
367e94c1 MH |
908 | if (!is_c_varname(pf->pvar->var)) { |
909 | /* Copy raw parameters */ | |
910 | pf->tvar->value = strdup(pf->pvar->var); | |
911 | if (pf->tvar->value == NULL) | |
912 | return -ENOMEM; | |
913 | if (pf->pvar->type) { | |
914 | pf->tvar->type = strdup(pf->pvar->type); | |
915 | if (pf->tvar->type == NULL) | |
916 | return -ENOMEM; | |
917 | } | |
918 | if (pf->pvar->name) { | |
919 | pf->tvar->name = strdup(pf->pvar->name); | |
920 | if (pf->tvar->name == NULL) | |
921 | return -ENOMEM; | |
922 | } else | |
923 | pf->tvar->name = NULL; | |
924 | return 0; | |
925 | } | |
926 | ||
48481938 | 927 | if (pf->pvar->name) |
02b95dad | 928 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 929 | else { |
02b95dad MH |
930 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
931 | if (ret < 0) | |
932 | return ret; | |
11a1ca35 MH |
933 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
934 | if (ptr) | |
935 | *ptr = '_'; | |
02b95dad | 936 | pf->tvar->name = strdup(buf); |
48481938 | 937 | } |
02b95dad MH |
938 | if (pf->tvar->name == NULL) |
939 | return -ENOMEM; | |
48481938 | 940 | |
b55a87ad MH |
941 | pr_debug("Searching '%s' variable in context.\n", |
942 | pf->pvar->var); | |
943 | /* Search child die for local variables and parameters. */ | |
378eeaad | 944 | if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
945 | ret = convert_variable(&vr_die, pf); |
946 | else { | |
947 | /* Search upper class */ | |
948 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
632941c4 MH |
949 | while (nscopes-- > 1) { |
950 | pr_debug("Searching variables in %s\n", | |
951 | dwarf_diename(&scopes[nscopes])); | |
952 | /* We should check this scope, so give dummy address */ | |
953 | if (die_find_variable_at(&scopes[nscopes], | |
954 | pf->pvar->var, 0, | |
955 | &vr_die)) { | |
b7dcb857 | 956 | ret = convert_variable(&vr_die, pf); |
632941c4 MH |
957 | goto found; |
958 | } | |
959 | } | |
960 | if (scopes) | |
b7dcb857 | 961 | free(scopes); |
632941c4 | 962 | ret = -ENOENT; |
b7dcb857 | 963 | } |
632941c4 | 964 | found: |
b7dcb857 | 965 | if (ret < 0) |
b55a87ad MH |
966 | pr_warning("Failed to find '%s' in this function.\n", |
967 | pf->pvar->var); | |
b7dcb857 | 968 | return ret; |
4ea42b18 MH |
969 | } |
970 | ||
cf6eb489 MH |
971 | /* Convert subprogram DIE to trace point */ |
972 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
973 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 974 | { |
e92b85e1 | 975 | Dwarf_Addr eaddr; |
804b3606 | 976 | const char *name; |
e92b85e1 | 977 | |
4235b045 | 978 | /* Copy the name of probe point */ |
804b3606 MH |
979 | name = dwarf_diename(sp_die); |
980 | if (name) { | |
b55a87ad | 981 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 982 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
983 | dwarf_diename(sp_die)); |
984 | return -ENOENT; | |
985 | } | |
cf6eb489 MH |
986 | tp->symbol = strdup(name); |
987 | if (tp->symbol == NULL) | |
02b95dad | 988 | return -ENOMEM; |
cf6eb489 | 989 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 990 | } else |
4ea42b18 | 991 | /* This function has no name. */ |
cf6eb489 | 992 | tp->offset = (unsigned long)paddr; |
4235b045 | 993 | |
04ddd04b | 994 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
995 | if (retprobe) { |
996 | if (eaddr != paddr) { | |
04ddd04b | 997 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 998 | " a real function.\n"); |
04ddd04b MH |
999 | return -EINVAL; |
1000 | } | |
cf6eb489 | 1001 | tp->retprobe = true; |
04ddd04b MH |
1002 | } |
1003 | ||
cf6eb489 MH |
1004 | return 0; |
1005 | } | |
1006 | ||
1007 | /* Call probe_finder callback with real subprogram DIE */ | |
1008 | static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1009 | { | |
1010 | Dwarf_Die die_mem; | |
1011 | Dwarf_Attribute fb_attr; | |
1012 | size_t nops; | |
1013 | int ret; | |
1014 | ||
1015 | /* If no real subprogram, find a real one */ | |
1016 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
1017 | sp_die = die_find_real_subprogram(&pf->cu_die, | |
1018 | pf->addr, &die_mem); | |
1019 | if (!sp_die) { | |
1020 | pr_warning("Failed to find probe point in any " | |
1021 | "functions.\n"); | |
1022 | return -ENOENT; | |
1023 | } | |
1024 | } | |
4ea42b18 | 1025 | |
804b3606 MH |
1026 | /* Get the frame base attribute/ops */ |
1027 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 1028 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 1029 | if (ret <= 0 || nops == 0) { |
804b3606 | 1030 | pf->fb_ops = NULL; |
7752f1b0 | 1031 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
1032 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
1033 | pf->cfi != NULL) { | |
1034 | Dwarf_Frame *frame; | |
b55a87ad MH |
1035 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
1036 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 1037 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
1038 | (uintmax_t)pf->addr); |
1039 | return -ENOENT; | |
1040 | } | |
7752f1b0 | 1041 | #endif |
a34a9854 | 1042 | } |
804b3606 | 1043 | |
cf6eb489 MH |
1044 | /* Call finder's callback handler */ |
1045 | ret = pf->callback(sp_die, pf); | |
804b3606 MH |
1046 | |
1047 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
1048 | pf->fb_ops = NULL; | |
cf6eb489 MH |
1049 | |
1050 | return ret; | |
4ea42b18 MH |
1051 | } |
1052 | ||
4ea42b18 | 1053 | /* Find probe point from its line number */ |
b55a87ad | 1054 | static int find_probe_point_by_line(struct probe_finder *pf) |
4ea42b18 | 1055 | { |
804b3606 MH |
1056 | Dwarf_Lines *lines; |
1057 | Dwarf_Line *line; | |
1058 | size_t nlines, i; | |
e92b85e1 | 1059 | Dwarf_Addr addr; |
804b3606 | 1060 | int lineno; |
b55a87ad | 1061 | int ret = 0; |
4ea42b18 | 1062 | |
b55a87ad | 1063 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
0e43e5d2 | 1064 | pr_warning("No source lines found.\n"); |
b55a87ad MH |
1065 | return -ENOENT; |
1066 | } | |
4ea42b18 | 1067 | |
b55a87ad | 1068 | for (i = 0; i < nlines && ret == 0; i++) { |
804b3606 | 1069 | line = dwarf_onesrcline(lines, i); |
b55a87ad MH |
1070 | if (dwarf_lineno(line, &lineno) != 0 || |
1071 | lineno != pf->lno) | |
4ea42b18 MH |
1072 | continue; |
1073 | ||
804b3606 MH |
1074 | /* TODO: Get fileno from line, but how? */ |
1075 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
1076 | continue; | |
b0ef0732 | 1077 | |
b55a87ad MH |
1078 | if (dwarf_lineaddr(line, &addr) != 0) { |
1079 | pr_warning("Failed to get the address of the line.\n"); | |
1080 | return -ENOENT; | |
1081 | } | |
804b3606 MH |
1082 | pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n", |
1083 | (int)i, lineno, (uintmax_t)addr); | |
4ea42b18 | 1084 | pf->addr = addr; |
804b3606 | 1085 | |
cf6eb489 | 1086 | ret = call_probe_finder(NULL, pf); |
4ea42b18 MH |
1087 | /* Continuing, because target line might be inlined. */ |
1088 | } | |
b55a87ad | 1089 | return ret; |
4ea42b18 MH |
1090 | } |
1091 | ||
2a9c8c36 MH |
1092 | /* Find lines which match lazy pattern */ |
1093 | static int find_lazy_match_lines(struct list_head *head, | |
1094 | const char *fname, const char *pat) | |
1095 | { | |
1096 | char *fbuf, *p1, *p2; | |
b448c4b6 | 1097 | int fd, line, nlines = -1; |
2a9c8c36 MH |
1098 | struct stat st; |
1099 | ||
1100 | fd = open(fname, O_RDONLY); | |
b55a87ad MH |
1101 | if (fd < 0) { |
1102 | pr_warning("Failed to open %s: %s\n", fname, strerror(-fd)); | |
b448c4b6 | 1103 | return -errno; |
b55a87ad MH |
1104 | } |
1105 | ||
b448c4b6 | 1106 | if (fstat(fd, &st) < 0) { |
b55a87ad MH |
1107 | pr_warning("Failed to get the size of %s: %s\n", |
1108 | fname, strerror(errno)); | |
b448c4b6 ACM |
1109 | nlines = -errno; |
1110 | goto out_close; | |
b55a87ad | 1111 | } |
b448c4b6 ACM |
1112 | |
1113 | nlines = -ENOMEM; | |
1114 | fbuf = malloc(st.st_size + 2); | |
1115 | if (fbuf == NULL) | |
1116 | goto out_close; | |
1117 | if (read(fd, fbuf, st.st_size) < 0) { | |
b55a87ad | 1118 | pr_warning("Failed to read %s: %s\n", fname, strerror(errno)); |
b448c4b6 ACM |
1119 | nlines = -errno; |
1120 | goto out_free_fbuf; | |
b55a87ad | 1121 | } |
2a9c8c36 MH |
1122 | fbuf[st.st_size] = '\n'; /* Dummy line */ |
1123 | fbuf[st.st_size + 1] = '\0'; | |
1124 | p1 = fbuf; | |
1125 | line = 1; | |
b448c4b6 | 1126 | nlines = 0; |
2a9c8c36 MH |
1127 | while ((p2 = strchr(p1, '\n')) != NULL) { |
1128 | *p2 = '\0'; | |
1129 | if (strlazymatch(p1, pat)) { | |
1130 | line_list__add_line(head, line); | |
1131 | nlines++; | |
1132 | } | |
1133 | line++; | |
1134 | p1 = p2 + 1; | |
1135 | } | |
b448c4b6 | 1136 | out_free_fbuf: |
2a9c8c36 | 1137 | free(fbuf); |
b448c4b6 ACM |
1138 | out_close: |
1139 | close(fd); | |
2a9c8c36 MH |
1140 | return nlines; |
1141 | } | |
1142 | ||
1143 | /* Find probe points from lazy pattern */ | |
b55a87ad | 1144 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 MH |
1145 | { |
1146 | Dwarf_Lines *lines; | |
1147 | Dwarf_Line *line; | |
1148 | size_t nlines, i; | |
1149 | Dwarf_Addr addr; | |
1150 | Dwarf_Die die_mem; | |
1151 | int lineno; | |
b55a87ad | 1152 | int ret = 0; |
2a9c8c36 MH |
1153 | |
1154 | if (list_empty(&pf->lcache)) { | |
1155 | /* Matching lazy line pattern */ | |
1156 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 1157 | pf->pev->point.lazy_line); |
b55a87ad MH |
1158 | if (ret == 0) { |
1159 | pr_debug("No matched lines found in %s.\n", pf->fname); | |
1160 | return 0; | |
1161 | } else if (ret < 0) | |
1162 | return ret; | |
2a9c8c36 MH |
1163 | } |
1164 | ||
b55a87ad | 1165 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
0e43e5d2 | 1166 | pr_warning("No source lines found.\n"); |
b55a87ad MH |
1167 | return -ENOENT; |
1168 | } | |
1169 | ||
1170 | for (i = 0; i < nlines && ret >= 0; i++) { | |
2a9c8c36 MH |
1171 | line = dwarf_onesrcline(lines, i); |
1172 | ||
b55a87ad MH |
1173 | if (dwarf_lineno(line, &lineno) != 0 || |
1174 | !line_list__has_line(&pf->lcache, lineno)) | |
2a9c8c36 MH |
1175 | continue; |
1176 | ||
1177 | /* TODO: Get fileno from line, but how? */ | |
1178 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
1179 | continue; | |
1180 | ||
b55a87ad MH |
1181 | if (dwarf_lineaddr(line, &addr) != 0) { |
1182 | pr_debug("Failed to get the address of line %d.\n", | |
1183 | lineno); | |
1184 | continue; | |
1185 | } | |
2a9c8c36 MH |
1186 | if (sp_die) { |
1187 | /* Address filtering 1: does sp_die include addr? */ | |
1188 | if (!dwarf_haspc(sp_die, addr)) | |
1189 | continue; | |
1190 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 1191 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
2a9c8c36 MH |
1192 | continue; |
1193 | } | |
1194 | ||
1195 | pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n", | |
1196 | (int)i, lineno, (unsigned long long)addr); | |
1197 | pf->addr = addr; | |
1198 | ||
cf6eb489 | 1199 | ret = call_probe_finder(sp_die, pf); |
2a9c8c36 MH |
1200 | /* Continuing, because target line might be inlined. */ |
1201 | } | |
1202 | /* TODO: deallocate lines, but how? */ | |
b55a87ad | 1203 | return ret; |
2a9c8c36 MH |
1204 | } |
1205 | ||
b55a87ad MH |
1206 | /* Callback parameter with return value */ |
1207 | struct dwarf_callback_param { | |
1208 | void *data; | |
1209 | int retval; | |
1210 | }; | |
1211 | ||
e92b85e1 MH |
1212 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1213 | { | |
b55a87ad MH |
1214 | struct dwarf_callback_param *param = data; |
1215 | struct probe_finder *pf = param->data; | |
4235b045 | 1216 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1217 | Dwarf_Addr addr; |
e92b85e1 | 1218 | |
2a9c8c36 | 1219 | if (pp->lazy_line) |
b55a87ad | 1220 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1221 | else { |
1222 | /* Get probe address */ | |
b55a87ad | 1223 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 1224 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad MH |
1225 | dwarf_diename(in_die)); |
1226 | param->retval = -ENOENT; | |
1227 | return DWARF_CB_ABORT; | |
1228 | } | |
1229 | pf->addr = addr; | |
2a9c8c36 MH |
1230 | pf->addr += pp->offset; |
1231 | pr_debug("found inline addr: 0x%jx\n", | |
1232 | (uintmax_t)pf->addr); | |
1233 | ||
cf6eb489 | 1234 | param->retval = call_probe_finder(in_die, pf); |
5d1ee041 MH |
1235 | if (param->retval < 0) |
1236 | return DWARF_CB_ABORT; | |
2a9c8c36 | 1237 | } |
e92b85e1 | 1238 | |
e92b85e1 MH |
1239 | return DWARF_CB_OK; |
1240 | } | |
804b3606 | 1241 | |
4ea42b18 | 1242 | /* Search function from function name */ |
e92b85e1 | 1243 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1244 | { |
b55a87ad MH |
1245 | struct dwarf_callback_param *param = data; |
1246 | struct probe_finder *pf = param->data; | |
4235b045 | 1247 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1248 | |
e92b85e1 MH |
1249 | /* Check tag and diename */ |
1250 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 1251 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 1252 | return DWARF_CB_OK; |
e92b85e1 | 1253 | |
2a9c8c36 | 1254 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1255 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1256 | dwarf_decl_line(sp_die, &pf->lno); |
1257 | pf->lno += pp->line; | |
b55a87ad | 1258 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1259 | } else if (!dwarf_func_inline(sp_die)) { |
1260 | /* Real function */ | |
2a9c8c36 | 1261 | if (pp->lazy_line) |
b55a87ad | 1262 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1263 | else { |
b55a87ad | 1264 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
1265 | pr_warning("Failed to get entry address of " |
1266 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1267 | param->retval = -ENOENT; |
1268 | return DWARF_CB_ABORT; | |
1269 | } | |
2a9c8c36 MH |
1270 | pf->addr += pp->offset; |
1271 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1272 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1273 | } |
b55a87ad MH |
1274 | } else { |
1275 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1276 | .retval = 0}; | |
e92b85e1 | 1277 | /* Inlined function: search instances */ |
b55a87ad MH |
1278 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1279 | &_param); | |
1280 | param->retval = _param.retval; | |
1281 | } | |
e92b85e1 | 1282 | |
b55a87ad | 1283 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1284 | } |
1285 | ||
b55a87ad | 1286 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1287 | { |
b55a87ad MH |
1288 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1289 | .retval = 0}; | |
1290 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1291 | return _param.retval; | |
4ea42b18 MH |
1292 | } |
1293 | ||
cf6eb489 MH |
1294 | /* Find probe points from debuginfo */ |
1295 | static int find_probes(int fd, struct probe_finder *pf) | |
4ea42b18 | 1296 | { |
cf6eb489 | 1297 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1298 | Dwarf_Off off, noff; |
1299 | size_t cuhl; | |
1300 | Dwarf_Die *diep; | |
469b9b88 MH |
1301 | Dwarf *dbg = NULL; |
1302 | Dwfl *dwfl; | |
1303 | Dwarf_Addr bias; /* Currently ignored */ | |
b55a87ad | 1304 | int ret = 0; |
804b3606 | 1305 | |
469b9b88 | 1306 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1307 | if (!dbg) { |
0e43e5d2 | 1308 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad MH |
1309 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1310 | return -EBADF; | |
1311 | } | |
4ea42b18 | 1312 | |
7752f1b0 | 1313 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1314 | /* Get the call frame information from this dwarf */ |
cf6eb489 | 1315 | pf->cfi = dwarf_getcfi(dbg); |
7752f1b0 | 1316 | #endif |
a34a9854 | 1317 | |
804b3606 | 1318 | off = 0; |
cf6eb489 | 1319 | line_list__init(&pf->lcache); |
804b3606 | 1320 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1321 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) && |
1322 | ret >= 0) { | |
4ea42b18 | 1323 | /* Get the DIE(Debugging Information Entry) of this CU */ |
cf6eb489 | 1324 | diep = dwarf_offdie(dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1325 | if (!diep) |
1326 | continue; | |
4ea42b18 MH |
1327 | |
1328 | /* Check if target file is included. */ | |
1329 | if (pp->file) | |
cf6eb489 | 1330 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1331 | else |
cf6eb489 | 1332 | pf->fname = NULL; |
4ea42b18 | 1333 | |
cf6eb489 | 1334 | if (!pp->file || pf->fname) { |
4ea42b18 | 1335 | if (pp->function) |
cf6eb489 | 1336 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1337 | else if (pp->lazy_line) |
cf6eb489 | 1338 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1339 | else { |
cf6eb489 MH |
1340 | pf->lno = pp->line; |
1341 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1342 | } |
4ea42b18 | 1343 | } |
804b3606 | 1344 | off = noff; |
4ea42b18 | 1345 | } |
cf6eb489 | 1346 | line_list__free(&pf->lcache); |
469b9b88 MH |
1347 | if (dwfl) |
1348 | dwfl_end(dwfl); | |
4ea42b18 | 1349 | |
cf6eb489 MH |
1350 | return ret; |
1351 | } | |
1352 | ||
1353 | /* Add a found probe point into trace event list */ | |
1354 | static int add_probe_trace_event(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1355 | { | |
1356 | struct trace_event_finder *tf = | |
1357 | container_of(pf, struct trace_event_finder, pf); | |
1358 | struct probe_trace_event *tev; | |
1359 | int ret, i; | |
1360 | ||
1361 | /* Check number of tevs */ | |
1362 | if (tf->ntevs == tf->max_tevs) { | |
1363 | pr_warning("Too many( > %d) probe point found.\n", | |
1364 | tf->max_tevs); | |
1365 | return -ERANGE; | |
1366 | } | |
1367 | tev = &tf->tevs[tf->ntevs++]; | |
1368 | ||
1369 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1370 | &tev->point); | |
1371 | if (ret < 0) | |
1372 | return ret; | |
1373 | ||
1374 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1375 | tev->point.offset); | |
1376 | ||
1377 | /* Find each argument */ | |
1378 | tev->nargs = pf->pev->nargs; | |
1379 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1380 | if (tev->args == NULL) | |
1381 | return -ENOMEM; | |
1382 | for (i = 0; i < pf->pev->nargs; i++) { | |
1383 | pf->pvar = &pf->pev->args[i]; | |
1384 | pf->tvar = &tev->args[i]; | |
1385 | ret = find_variable(sp_die, pf); | |
1386 | if (ret != 0) | |
1387 | return ret; | |
1388 | } | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
1394 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1395 | struct probe_trace_event **tevs, int max_tevs) | |
1396 | { | |
1397 | struct trace_event_finder tf = { | |
1398 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1399 | .max_tevs = max_tevs}; | |
1400 | int ret; | |
1401 | ||
1402 | /* Allocate result tevs array */ | |
1403 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1404 | if (*tevs == NULL) | |
1405 | return -ENOMEM; | |
1406 | ||
1407 | tf.tevs = *tevs; | |
1408 | tf.ntevs = 0; | |
1409 | ||
1410 | ret = find_probes(fd, &tf.pf); | |
1411 | if (ret < 0) { | |
1412 | free(*tevs); | |
1413 | *tevs = NULL; | |
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | return (ret < 0) ? ret : tf.ntevs; | |
1418 | } | |
1419 | ||
1420 | #define MAX_VAR_LEN 64 | |
1421 | ||
1422 | /* Collect available variables in this scope */ | |
1423 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1424 | { | |
1425 | struct available_var_finder *af = data; | |
1426 | struct variable_list *vl; | |
1427 | char buf[MAX_VAR_LEN]; | |
1428 | int tag, ret; | |
1429 | ||
1430 | vl = &af->vls[af->nvls - 1]; | |
1431 | ||
1432 | tag = dwarf_tag(die_mem); | |
1433 | if (tag == DW_TAG_formal_parameter || | |
1434 | tag == DW_TAG_variable) { | |
1435 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1436 | af->pf.fb_ops, NULL); | |
1437 | if (ret == 0) { | |
1438 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1439 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1440 | if (ret > 0) |
1441 | strlist__add(vl->vars, buf); | |
1442 | } | |
1443 | } | |
1444 | ||
fb8c5a56 | 1445 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1446 | return DIE_FIND_CB_CONTINUE; |
1447 | else | |
1448 | return DIE_FIND_CB_SIBLING; | |
1449 | } | |
1450 | ||
1451 | /* Add a found vars into available variables list */ | |
1452 | static int add_available_vars(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1453 | { | |
1454 | struct available_var_finder *af = | |
1455 | container_of(pf, struct available_var_finder, pf); | |
1456 | struct variable_list *vl; | |
fb8c5a56 MH |
1457 | Dwarf_Die die_mem, *scopes = NULL; |
1458 | int ret, nscopes; | |
cf6eb489 MH |
1459 | |
1460 | /* Check number of tevs */ | |
1461 | if (af->nvls == af->max_vls) { | |
1462 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1463 | return -ERANGE; | |
1464 | } | |
1465 | vl = &af->vls[af->nvls++]; | |
1466 | ||
1467 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1468 | &vl->point); | |
1469 | if (ret < 0) | |
1470 | return ret; | |
1471 | ||
1472 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1473 | vl->point.offset); | |
1474 | ||
1475 | /* Find local variables */ | |
1476 | vl->vars = strlist__new(true, NULL); | |
1477 | if (vl->vars == NULL) | |
1478 | return -ENOMEM; | |
fb8c5a56 | 1479 | af->child = true; |
cf6eb489 MH |
1480 | die_find_child(sp_die, collect_variables_cb, (void *)af, &die_mem); |
1481 | ||
fb8c5a56 MH |
1482 | /* Find external variables */ |
1483 | if (!af->externs) | |
1484 | goto out; | |
1485 | /* Don't need to search child DIE for externs. */ | |
1486 | af->child = false; | |
1487 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
1488 | while (nscopes-- > 1) | |
1489 | die_find_child(&scopes[nscopes], collect_variables_cb, | |
1490 | (void *)af, &die_mem); | |
1491 | if (scopes) | |
1492 | free(scopes); | |
1493 | ||
1494 | out: | |
cf6eb489 MH |
1495 | if (strlist__empty(vl->vars)) { |
1496 | strlist__delete(vl->vars); | |
1497 | vl->vars = NULL; | |
1498 | } | |
1499 | ||
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | /* Find available variables at given probe point */ | |
1504 | int find_available_vars_at(int fd, struct perf_probe_event *pev, | |
fb8c5a56 MH |
1505 | struct variable_list **vls, int max_vls, |
1506 | bool externs) | |
cf6eb489 MH |
1507 | { |
1508 | struct available_var_finder af = { | |
1509 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1510 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1511 | int ret; |
1512 | ||
1513 | /* Allocate result vls array */ | |
1514 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1515 | if (*vls == NULL) | |
1516 | return -ENOMEM; | |
1517 | ||
1518 | af.vls = *vls; | |
1519 | af.nvls = 0; | |
1520 | ||
1521 | ret = find_probes(fd, &af.pf); | |
1522 | if (ret < 0) { | |
1523 | /* Free vlist for error */ | |
1524 | while (af.nvls--) { | |
1525 | if (af.vls[af.nvls].point.symbol) | |
1526 | free(af.vls[af.nvls].point.symbol); | |
1527 | if (af.vls[af.nvls].vars) | |
1528 | strlist__delete(af.vls[af.nvls].vars); | |
1529 | } | |
1530 | free(af.vls); | |
1531 | *vls = NULL; | |
1532 | return ret; | |
1533 | } | |
1534 | ||
1535 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1536 | } |
1537 | ||
fb1587d8 | 1538 | /* Reverse search */ |
469b9b88 | 1539 | int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt) |
fb1587d8 MH |
1540 | { |
1541 | Dwarf_Die cudie, spdie, indie; | |
469b9b88 MH |
1542 | Dwarf *dbg = NULL; |
1543 | Dwfl *dwfl = NULL; | |
fb1587d8 | 1544 | Dwarf_Line *line; |
469b9b88 | 1545 | Dwarf_Addr laddr, eaddr, bias = 0; |
fb1587d8 MH |
1546 | const char *tmp; |
1547 | int lineno, ret = 0; | |
b55a87ad | 1548 | bool found = false; |
fb1587d8 | 1549 | |
469b9b88 MH |
1550 | /* Open the live linux kernel */ |
1551 | dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias); | |
1552 | if (!dbg) { | |
0e43e5d2 | 1553 | pr_warning("No debug information found in the vmlinux - " |
469b9b88 MH |
1554 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1555 | ret = -EINVAL; | |
1556 | goto end; | |
1557 | } | |
fb1587d8 | 1558 | |
469b9b88 MH |
1559 | /* Adjust address with bias */ |
1560 | addr += bias; | |
fb1587d8 | 1561 | /* Find cu die */ |
469b9b88 | 1562 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) { |
0e43e5d2 MH |
1563 | pr_warning("Failed to find debug information for address %lx\n", |
1564 | addr); | |
75ec5a24 MH |
1565 | ret = -EINVAL; |
1566 | goto end; | |
1567 | } | |
fb1587d8 MH |
1568 | |
1569 | /* Find a corresponding line */ | |
1570 | line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr); | |
1571 | if (line) { | |
b55a87ad MH |
1572 | if (dwarf_lineaddr(line, &laddr) == 0 && |
1573 | (Dwarf_Addr)addr == laddr && | |
1574 | dwarf_lineno(line, &lineno) == 0) { | |
fb1587d8 | 1575 | tmp = dwarf_linesrc(line, NULL, NULL); |
b55a87ad MH |
1576 | if (tmp) { |
1577 | ppt->line = lineno; | |
02b95dad MH |
1578 | ppt->file = strdup(tmp); |
1579 | if (ppt->file == NULL) { | |
1580 | ret = -ENOMEM; | |
1581 | goto end; | |
1582 | } | |
b55a87ad MH |
1583 | found = true; |
1584 | } | |
fb1587d8 MH |
1585 | } |
1586 | } | |
1587 | ||
1588 | /* Find a corresponding function */ | |
1589 | if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) { | |
1590 | tmp = dwarf_diename(&spdie); | |
b55a87ad | 1591 | if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0) |
fb1587d8 MH |
1592 | goto end; |
1593 | ||
b55a87ad MH |
1594 | if (ppt->line) { |
1595 | if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1596 | &indie)) { | |
1597 | /* addr in an inline function */ | |
1598 | tmp = dwarf_diename(&indie); | |
1599 | if (!tmp) | |
1600 | goto end; | |
1601 | ret = dwarf_decl_line(&indie, &lineno); | |
1602 | } else { | |
1603 | if (eaddr == addr) { /* Function entry */ | |
1604 | lineno = ppt->line; | |
1605 | ret = 0; | |
1606 | } else | |
1607 | ret = dwarf_decl_line(&spdie, &lineno); | |
1608 | } | |
1609 | if (ret == 0) { | |
1610 | /* Make a relative line number */ | |
1611 | ppt->line -= lineno; | |
1612 | goto found; | |
1613 | } | |
fb1587d8 | 1614 | } |
b55a87ad MH |
1615 | /* We don't have a line number, let's use offset */ |
1616 | ppt->offset = addr - (unsigned long)eaddr; | |
1617 | found: | |
02b95dad MH |
1618 | ppt->function = strdup(tmp); |
1619 | if (ppt->function == NULL) { | |
1620 | ret = -ENOMEM; | |
1621 | goto end; | |
1622 | } | |
b55a87ad | 1623 | found = true; |
fb1587d8 MH |
1624 | } |
1625 | ||
1626 | end: | |
469b9b88 MH |
1627 | if (dwfl) |
1628 | dwfl_end(dwfl); | |
b55a87ad MH |
1629 | if (ret >= 0) |
1630 | ret = found ? 1 : 0; | |
fb1587d8 MH |
1631 | return ret; |
1632 | } | |
1633 | ||
f6c903f5 MH |
1634 | /* Add a line and store the src path */ |
1635 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1636 | struct line_range *lr) | |
1637 | { | |
7cf0b79e | 1638 | /* Copy source path */ |
f6c903f5 | 1639 | if (!lr->path) { |
7cf0b79e MH |
1640 | lr->path = strdup(src); |
1641 | if (lr->path == NULL) | |
1642 | return -ENOMEM; | |
f6c903f5 MH |
1643 | } |
1644 | return line_list__add_line(&lr->line_list, lineno); | |
1645 | } | |
1646 | ||
1647 | /* Search function declaration lines */ | |
1648 | static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data) | |
1649 | { | |
1650 | struct dwarf_callback_param *param = data; | |
1651 | struct line_finder *lf = param->data; | |
1652 | const char *src; | |
1653 | int lineno; | |
1654 | ||
1655 | src = dwarf_decl_file(sp_die); | |
1656 | if (src && strtailcmp(src, lf->fname) != 0) | |
1657 | return DWARF_CB_OK; | |
1658 | ||
1659 | if (dwarf_decl_line(sp_die, &lineno) != 0 || | |
1660 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
1661 | return DWARF_CB_OK; | |
1662 | ||
1663 | param->retval = line_range_add_line(src, lineno, lf->lr); | |
5d1ee041 MH |
1664 | if (param->retval < 0) |
1665 | return DWARF_CB_ABORT; | |
f6c903f5 MH |
1666 | return DWARF_CB_OK; |
1667 | } | |
1668 | ||
1669 | static int find_line_range_func_decl_lines(struct line_finder *lf) | |
1670 | { | |
1671 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; | |
1672 | dwarf_getfuncs(&lf->cu_die, line_range_funcdecl_cb, ¶m, 0); | |
1673 | return param.retval; | |
1674 | } | |
fb1587d8 | 1675 | |
631c9def | 1676 | /* Find line range from its line number */ |
b55a87ad | 1677 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1678 | { |
804b3606 MH |
1679 | Dwarf_Lines *lines; |
1680 | Dwarf_Line *line; | |
1681 | size_t nlines, i; | |
631c9def | 1682 | Dwarf_Addr addr; |
f6c903f5 | 1683 | int lineno, ret = 0; |
804b3606 | 1684 | const char *src; |
161a26b0 | 1685 | Dwarf_Die die_mem; |
631c9def | 1686 | |
2a9c8c36 | 1687 | line_list__init(&lf->lr->line_list); |
b55a87ad | 1688 | if (dwarf_getsrclines(&lf->cu_die, &lines, &nlines) != 0) { |
0e43e5d2 | 1689 | pr_warning("No source lines found.\n"); |
b55a87ad MH |
1690 | return -ENOENT; |
1691 | } | |
631c9def | 1692 | |
f6c903f5 | 1693 | /* Search probable lines on lines list */ |
804b3606 MH |
1694 | for (i = 0; i < nlines; i++) { |
1695 | line = dwarf_onesrcline(lines, i); | |
b55a87ad MH |
1696 | if (dwarf_lineno(line, &lineno) != 0 || |
1697 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
631c9def MH |
1698 | continue; |
1699 | ||
161a26b0 MH |
1700 | if (sp_die) { |
1701 | /* Address filtering 1: does sp_die include addr? */ | |
b55a87ad MH |
1702 | if (dwarf_lineaddr(line, &addr) != 0 || |
1703 | !dwarf_haspc(sp_die, addr)) | |
161a26b0 MH |
1704 | continue; |
1705 | ||
1706 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 1707 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
161a26b0 MH |
1708 | continue; |
1709 | } | |
1710 | ||
804b3606 MH |
1711 | /* TODO: Get fileno from line, but how? */ |
1712 | src = dwarf_linesrc(line, NULL, NULL); | |
1713 | if (strtailcmp(src, lf->fname) != 0) | |
631c9def MH |
1714 | continue; |
1715 | ||
f6c903f5 MH |
1716 | ret = line_range_add_line(src, lineno, lf->lr); |
1717 | if (ret < 0) | |
1718 | return ret; | |
631c9def | 1719 | } |
f6c903f5 MH |
1720 | |
1721 | /* | |
1722 | * Dwarf lines doesn't include function declarations. We have to | |
1723 | * check functions list or given function. | |
1724 | */ | |
1725 | if (sp_die) { | |
1726 | src = dwarf_decl_file(sp_die); | |
1727 | if (src && dwarf_decl_line(sp_die, &lineno) == 0 && | |
1728 | (lf->lno_s <= lineno && lf->lno_e >= lineno)) | |
1729 | ret = line_range_add_line(src, lineno, lf->lr); | |
1730 | } else | |
1731 | ret = find_line_range_func_decl_lines(lf); | |
1732 | ||
804b3606 | 1733 | /* Update status */ |
f6c903f5 MH |
1734 | if (ret >= 0) |
1735 | if (!list_empty(&lf->lr->line_list)) | |
1736 | ret = lf->found = 1; | |
1737 | else | |
1738 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1739 | else { |
1740 | free(lf->lr->path); | |
1741 | lf->lr->path = NULL; | |
1742 | } | |
f6c903f5 | 1743 | return ret; |
631c9def MH |
1744 | } |
1745 | ||
161a26b0 MH |
1746 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1747 | { | |
b55a87ad MH |
1748 | struct dwarf_callback_param *param = data; |
1749 | ||
1750 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1751 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1752 | } | |
1753 | ||
631c9def | 1754 | /* Search function from function name */ |
e92b85e1 | 1755 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1756 | { |
b55a87ad MH |
1757 | struct dwarf_callback_param *param = data; |
1758 | struct line_finder *lf = param->data; | |
631c9def | 1759 | struct line_range *lr = lf->lr; |
631c9def | 1760 | |
66a301c3 ACM |
1761 | pr_debug("find (%llx) %s\n", |
1762 | (unsigned long long)dwarf_dieoffset(sp_die), | |
469b9b88 | 1763 | dwarf_diename(sp_die)); |
e92b85e1 | 1764 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1765 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1766 | lf->fname = dwarf_decl_file(sp_die); |
1767 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1768 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1769 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1770 | if (lf->lno_s < 0) /* Overflow */ |
1771 | lf->lno_s = INT_MAX; | |
1772 | lf->lno_e = lr->offset + lr->end; | |
1773 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1774 | lf->lno_e = INT_MAX; |
d3b63d7a | 1775 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1776 | lr->start = lf->lno_s; |
1777 | lr->end = lf->lno_e; | |
b55a87ad MH |
1778 | if (dwarf_func_inline(sp_die)) { |
1779 | struct dwarf_callback_param _param; | |
1780 | _param.data = (void *)lf; | |
1781 | _param.retval = 0; | |
161a26b0 | 1782 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1783 | line_range_inline_cb, |
1784 | &_param); | |
1785 | param->retval = _param.retval; | |
1786 | } else | |
1787 | param->retval = find_line_range_by_line(sp_die, lf); | |
1788 | return DWARF_CB_ABORT; | |
631c9def | 1789 | } |
b55a87ad | 1790 | return DWARF_CB_OK; |
631c9def MH |
1791 | } |
1792 | ||
b55a87ad | 1793 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1794 | { |
b55a87ad MH |
1795 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1796 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1797 | return param.retval; | |
631c9def MH |
1798 | } |
1799 | ||
1800 | int find_line_range(int fd, struct line_range *lr) | |
1801 | { | |
804b3606 | 1802 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1803 | int ret = 0; |
804b3606 MH |
1804 | Dwarf_Off off = 0, noff; |
1805 | size_t cuhl; | |
1806 | Dwarf_Die *diep; | |
469b9b88 MH |
1807 | Dwarf *dbg = NULL; |
1808 | Dwfl *dwfl; | |
1809 | Dwarf_Addr bias; /* Currently ignored */ | |
6a330a3c | 1810 | const char *comp_dir; |
804b3606 | 1811 | |
469b9b88 | 1812 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1813 | if (!dbg) { |
0e43e5d2 | 1814 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad MH |
1815 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1816 | return -EBADF; | |
1817 | } | |
631c9def | 1818 | |
804b3606 | 1819 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1820 | while (!lf.found && ret >= 0) { |
1821 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
1822 | break; |
1823 | ||
1824 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
1825 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
1826 | if (!diep) | |
1827 | continue; | |
631c9def MH |
1828 | |
1829 | /* Check if target file is included. */ | |
1830 | if (lr->file) | |
2a9c8c36 | 1831 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1832 | else |
2a9c8c36 | 1833 | lf.fname = 0; |
631c9def | 1834 | |
2a9c8c36 | 1835 | if (!lr->file || lf.fname) { |
631c9def | 1836 | if (lr->function) |
b55a87ad | 1837 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1838 | else { |
1839 | lf.lno_s = lr->start; | |
d3b63d7a | 1840 | lf.lno_e = lr->end; |
b55a87ad | 1841 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1842 | } |
631c9def | 1843 | } |
804b3606 | 1844 | off = noff; |
631c9def | 1845 | } |
6a330a3c MH |
1846 | |
1847 | /* Store comp_dir */ | |
1848 | if (lf.found) { | |
1849 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1850 | if (comp_dir) { | |
1851 | lr->comp_dir = strdup(comp_dir); | |
1852 | if (!lr->comp_dir) | |
1853 | ret = -ENOMEM; | |
1854 | } | |
1855 | } | |
1856 | ||
7cf0b79e | 1857 | pr_debug("path: %s\n", lr->path); |
469b9b88 | 1858 | dwfl_end(dwfl); |
b55a87ad | 1859 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1860 | } |
1861 |