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 | ||
5069ed86 MH |
283 | /* Get callsite line number of inline-function instance */ |
284 | static int die_get_call_lineno(Dwarf_Die *in_die) | |
285 | { | |
286 | Dwarf_Attribute attr; | |
287 | Dwarf_Word ret; | |
288 | ||
289 | if (!dwarf_attr(in_die, DW_AT_call_line, &attr)) | |
290 | return -ENOENT; | |
291 | ||
292 | dwarf_formudata(&attr, &ret); | |
293 | return (int)ret; | |
294 | } | |
295 | ||
4046b8bb MH |
296 | /* Get type die */ |
297 | static Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
298 | { | |
299 | Dwarf_Attribute attr; | |
300 | ||
301 | if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && | |
302 | dwarf_formref_die(&attr, die_mem)) | |
303 | return die_mem; | |
304 | else | |
305 | return NULL; | |
306 | } | |
307 | ||
cf6eb489 MH |
308 | /* Get a type die, but skip qualifiers */ |
309 | static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
7df2f329 | 310 | { |
7df2f329 MH |
311 | int tag; |
312 | ||
313 | do { | |
4046b8bb MH |
314 | vr_die = die_get_type(vr_die, die_mem); |
315 | if (!vr_die) | |
316 | break; | |
317 | tag = dwarf_tag(vr_die); | |
7df2f329 MH |
318 | } while (tag == DW_TAG_const_type || |
319 | tag == DW_TAG_restrict_type || | |
320 | tag == DW_TAG_volatile_type || | |
cf6eb489 MH |
321 | tag == DW_TAG_shared_type); |
322 | ||
323 | return vr_die; | |
324 | } | |
325 | ||
326 | /* Get a type die, but skip qualifiers and typedef */ | |
327 | static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
328 | { | |
329 | do { | |
330 | vr_die = __die_get_real_type(vr_die, die_mem); | |
331 | } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); | |
7df2f329 | 332 | |
4046b8bb | 333 | return vr_die; |
7df2f329 MH |
334 | } |
335 | ||
4984912e MH |
336 | static bool die_is_signed_type(Dwarf_Die *tp_die) |
337 | { | |
338 | Dwarf_Attribute attr; | |
339 | Dwarf_Word ret; | |
340 | ||
341 | if (dwarf_attr(tp_die, DW_AT_encoding, &attr) == NULL || | |
342 | dwarf_formudata(&attr, &ret) != 0) | |
343 | return false; | |
344 | ||
345 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
346 | ret == DW_ATE_signed_fixed); | |
347 | } | |
348 | ||
349 | static int die_get_byte_size(Dwarf_Die *tp_die) | |
350 | { | |
351 | Dwarf_Attribute attr; | |
352 | Dwarf_Word ret; | |
353 | ||
354 | if (dwarf_attr(tp_die, DW_AT_byte_size, &attr) == NULL || | |
355 | dwarf_formudata(&attr, &ret) != 0) | |
356 | return 0; | |
357 | ||
358 | return (int)ret; | |
359 | } | |
360 | ||
de1439d8 MH |
361 | /* Get data_member_location offset */ |
362 | static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
363 | { | |
364 | Dwarf_Attribute attr; | |
365 | Dwarf_Op *expr; | |
366 | size_t nexpr; | |
367 | int ret; | |
368 | ||
369 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
370 | return -ENOENT; | |
371 | ||
372 | if (dwarf_formudata(&attr, offs) != 0) { | |
373 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
374 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
375 | if (ret < 0 || nexpr == 0) | |
376 | return -ENOENT; | |
377 | ||
378 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
379 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
380 | expr[0].atom, nexpr); | |
381 | return -ENOTSUP; | |
382 | } | |
383 | *offs = (Dwarf_Word)expr[0].number; | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
016f262e MH |
388 | /* Return values for die_find callbacks */ |
389 | enum { | |
390 | DIE_FIND_CB_FOUND = 0, /* End of Search */ | |
391 | DIE_FIND_CB_CHILD = 1, /* Search only children */ | |
392 | DIE_FIND_CB_SIBLING = 2, /* Search only siblings */ | |
393 | DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */ | |
394 | }; | |
395 | ||
396 | /* Search a child die */ | |
397 | static Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
398 | int (*callback)(Dwarf_Die *, void *), | |
399 | void *data, Dwarf_Die *die_mem) | |
400 | { | |
401 | Dwarf_Die child_die; | |
402 | int ret; | |
403 | ||
404 | ret = dwarf_child(rt_die, die_mem); | |
405 | if (ret != 0) | |
406 | return NULL; | |
407 | ||
408 | do { | |
409 | ret = callback(die_mem, data); | |
410 | if (ret == DIE_FIND_CB_FOUND) | |
411 | return die_mem; | |
412 | ||
413 | if ((ret & DIE_FIND_CB_CHILD) && | |
414 | die_find_child(die_mem, callback, data, &child_die)) { | |
415 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
416 | return die_mem; | |
417 | } | |
418 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
419 | dwarf_siblingof(die_mem, die_mem) == 0); | |
420 | ||
421 | return NULL; | |
422 | } | |
423 | ||
804b3606 MH |
424 | struct __addr_die_search_param { |
425 | Dwarf_Addr addr; | |
426 | Dwarf_Die *die_mem; | |
427 | }; | |
428 | ||
429 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
631c9def | 430 | { |
804b3606 | 431 | struct __addr_die_search_param *ad = data; |
631c9def | 432 | |
804b3606 MH |
433 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
434 | dwarf_haspc(fn_die, ad->addr)) { | |
435 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
436 | return DWARF_CB_ABORT; | |
437 | } | |
438 | return DWARF_CB_OK; | |
439 | } | |
631c9def | 440 | |
804b3606 | 441 | /* Search a real subprogram including this line, */ |
95a3e4c4 MH |
442 | static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
443 | Dwarf_Die *die_mem) | |
804b3606 MH |
444 | { |
445 | struct __addr_die_search_param ad; | |
446 | ad.addr = addr; | |
447 | ad.die_mem = die_mem; | |
448 | /* dwarf_getscopes can't find subprogram. */ | |
449 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
450 | return NULL; | |
451 | else | |
452 | return die_mem; | |
631c9def MH |
453 | } |
454 | ||
016f262e MH |
455 | /* die_find callback for inline function search */ |
456 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
161a26b0 | 457 | { |
016f262e | 458 | Dwarf_Addr *addr = data; |
161a26b0 | 459 | |
016f262e MH |
460 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
461 | dwarf_haspc(die_mem, *addr)) | |
462 | return DIE_FIND_CB_FOUND; | |
161a26b0 | 463 | |
016f262e | 464 | return DIE_FIND_CB_CONTINUE; |
161a26b0 MH |
465 | } |
466 | ||
016f262e MH |
467 | /* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ |
468 | static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
469 | Dwarf_Die *die_mem) | |
4ea42b18 | 470 | { |
016f262e | 471 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); |
4ea42b18 MH |
472 | } |
473 | ||
4cc9cec6 MH |
474 | /* Walker on lines (Note: line number will not be sorted) */ |
475 | typedef int (* line_walk_handler_t) (const char *fname, int lineno, | |
476 | Dwarf_Addr addr, void *data); | |
477 | ||
478 | struct __line_walk_param { | |
5069ed86 | 479 | const char *fname; |
4cc9cec6 MH |
480 | line_walk_handler_t handler; |
481 | void *data; | |
482 | int retval; | |
483 | }; | |
484 | ||
5069ed86 MH |
485 | static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) |
486 | { | |
487 | struct __line_walk_param *lw = data; | |
488 | Dwarf_Addr addr; | |
489 | int lineno; | |
490 | ||
491 | if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) { | |
492 | lineno = die_get_call_lineno(in_die); | |
493 | if (lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) { | |
494 | lw->retval = lw->handler(lw->fname, lineno, addr, | |
495 | lw->data); | |
496 | if (lw->retval != 0) | |
497 | return DIE_FIND_CB_FOUND; | |
498 | } | |
499 | } | |
500 | return DIE_FIND_CB_SIBLING; | |
501 | } | |
502 | ||
503 | /* Walk on lines of blocks included in given DIE */ | |
4cc9cec6 MH |
504 | static int __die_walk_funclines(Dwarf_Die *sp_die, |
505 | line_walk_handler_t handler, void *data) | |
506 | { | |
5069ed86 MH |
507 | struct __line_walk_param lw = { |
508 | .handler = handler, | |
509 | .data = data, | |
510 | .retval = 0, | |
511 | }; | |
512 | Dwarf_Die die_mem; | |
4cc9cec6 | 513 | Dwarf_Addr addr; |
5069ed86 | 514 | int lineno; |
4cc9cec6 MH |
515 | |
516 | /* Handle function declaration line */ | |
5069ed86 MH |
517 | lw.fname = dwarf_decl_file(sp_die); |
518 | if (lw.fname && dwarf_decl_line(sp_die, &lineno) == 0 && | |
4cc9cec6 | 519 | dwarf_entrypc(sp_die, &addr) == 0) { |
5069ed86 MH |
520 | lw.retval = handler(lw.fname, lineno, addr, data); |
521 | if (lw.retval != 0) | |
522 | goto done; | |
4cc9cec6 | 523 | } |
5069ed86 MH |
524 | die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem); |
525 | done: | |
526 | return lw.retval; | |
4cc9cec6 MH |
527 | } |
528 | ||
529 | static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) | |
530 | { | |
531 | struct __line_walk_param *lw = data; | |
532 | ||
533 | lw->retval = __die_walk_funclines(sp_die, lw->handler, lw->data); | |
534 | if (lw->retval != 0) | |
535 | return DWARF_CB_ABORT; | |
536 | ||
537 | return DWARF_CB_OK; | |
538 | } | |
539 | ||
540 | /* | |
541 | * Walk on lines inside given PDIE. If the PDIE is subprogram, walk only on | |
542 | * the lines inside the subprogram, otherwise PDIE must be a CU DIE. | |
543 | */ | |
544 | static int die_walk_lines(Dwarf_Die *pdie, line_walk_handler_t handler, | |
545 | void *data) | |
546 | { | |
547 | Dwarf_Lines *lines; | |
548 | Dwarf_Line *line; | |
549 | Dwarf_Addr addr; | |
550 | const char *fname; | |
551 | int lineno, ret = 0; | |
552 | Dwarf_Die die_mem, *cu_die; | |
553 | size_t nlines, i; | |
554 | ||
555 | /* Get the CU die */ | |
556 | if (dwarf_tag(pdie) == DW_TAG_subprogram) | |
557 | cu_die = dwarf_diecu(pdie, &die_mem, NULL, NULL); | |
558 | else | |
559 | cu_die = pdie; | |
560 | if (!cu_die) { | |
561 | pr_debug2("Failed to get CU from subprogram\n"); | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | /* Get lines list in the CU */ | |
566 | if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) { | |
567 | pr_debug2("Failed to get source lines on this CU.\n"); | |
568 | return -ENOENT; | |
569 | } | |
570 | pr_debug2("Get %zd lines from this CU\n", nlines); | |
571 | ||
572 | /* Walk on the lines on lines list */ | |
573 | for (i = 0; i < nlines; i++) { | |
574 | line = dwarf_onesrcline(lines, i); | |
575 | if (line == NULL || | |
576 | dwarf_lineno(line, &lineno) != 0 || | |
577 | dwarf_lineaddr(line, &addr) != 0) { | |
578 | pr_debug2("Failed to get line info. " | |
579 | "Possible error in debuginfo.\n"); | |
580 | continue; | |
581 | } | |
582 | /* Filter lines based on address */ | |
583 | if (pdie != cu_die) | |
584 | /* | |
585 | * Address filtering | |
586 | * The line is included in given function, and | |
587 | * no inline block includes it. | |
588 | */ | |
589 | if (!dwarf_haspc(pdie, addr) || | |
590 | die_find_inlinefunc(pdie, addr, &die_mem)) | |
591 | continue; | |
592 | /* Get source line */ | |
593 | fname = dwarf_linesrc(line, NULL, NULL); | |
594 | ||
595 | ret = handler(fname, lineno, addr, data); | |
596 | if (ret != 0) | |
597 | return ret; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Dwarf lines doesn't include function declarations and inlined | |
602 | * subroutines. We have to check functions list or given function. | |
603 | */ | |
604 | if (pdie != cu_die) | |
605 | ret = __die_walk_funclines(pdie, handler, data); | |
606 | else { | |
607 | struct __line_walk_param param = { | |
608 | .handler = handler, | |
609 | .data = data, | |
610 | .retval = 0, | |
611 | }; | |
612 | dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0); | |
613 | ret = param.retval; | |
614 | } | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
378eeaad MH |
619 | struct __find_variable_param { |
620 | const char *name; | |
621 | Dwarf_Addr addr; | |
622 | }; | |
623 | ||
016f262e | 624 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
4ea42b18 | 625 | { |
378eeaad | 626 | struct __find_variable_param *fvp = data; |
016f262e | 627 | int tag; |
4ea42b18 | 628 | |
016f262e MH |
629 | tag = dwarf_tag(die_mem); |
630 | if ((tag == DW_TAG_formal_parameter || | |
631 | tag == DW_TAG_variable) && | |
378eeaad | 632 | die_compare_name(die_mem, fvp->name)) |
016f262e MH |
633 | return DIE_FIND_CB_FOUND; |
634 | ||
378eeaad MH |
635 | if (dwarf_haspc(die_mem, fvp->addr)) |
636 | return DIE_FIND_CB_CONTINUE; | |
637 | else | |
638 | return DIE_FIND_CB_SIBLING; | |
4ea42b18 MH |
639 | } |
640 | ||
378eeaad MH |
641 | /* Find a variable called 'name' at given address */ |
642 | static Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, | |
643 | Dwarf_Addr addr, Dwarf_Die *die_mem) | |
4ea42b18 | 644 | { |
378eeaad MH |
645 | struct __find_variable_param fvp = { .name = name, .addr = addr}; |
646 | ||
647 | return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, | |
016f262e | 648 | die_mem); |
4ea42b18 MH |
649 | } |
650 | ||
7df2f329 MH |
651 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
652 | { | |
653 | const char *name = data; | |
654 | ||
655 | if ((dwarf_tag(die_mem) == DW_TAG_member) && | |
82175633 | 656 | die_compare_name(die_mem, name)) |
7df2f329 MH |
657 | return DIE_FIND_CB_FOUND; |
658 | ||
659 | return DIE_FIND_CB_SIBLING; | |
660 | } | |
661 | ||
662 | /* Find a member called 'name' */ | |
663 | static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
664 | Dwarf_Die *die_mem) | |
665 | { | |
666 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
667 | die_mem); | |
668 | } | |
669 | ||
cf6eb489 MH |
670 | /* Get the name of given variable DIE */ |
671 | static int die_get_typename(Dwarf_Die *vr_die, char *buf, int len) | |
672 | { | |
673 | Dwarf_Die type; | |
674 | int tag, ret, ret2; | |
675 | const char *tmp = ""; | |
676 | ||
677 | if (__die_get_real_type(vr_die, &type) == NULL) | |
678 | return -ENOENT; | |
679 | ||
680 | tag = dwarf_tag(&type); | |
681 | if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) | |
682 | tmp = "*"; | |
683 | else if (tag == DW_TAG_subroutine_type) { | |
684 | /* Function pointer */ | |
685 | ret = snprintf(buf, len, "(function_type)"); | |
686 | return (ret >= len) ? -E2BIG : ret; | |
687 | } else { | |
688 | if (!dwarf_diename(&type)) | |
689 | return -ENOENT; | |
690 | if (tag == DW_TAG_union_type) | |
691 | tmp = "union "; | |
692 | else if (tag == DW_TAG_structure_type) | |
693 | tmp = "struct "; | |
694 | /* Write a base name */ | |
695 | ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type)); | |
696 | return (ret >= len) ? -E2BIG : ret; | |
697 | } | |
698 | ret = die_get_typename(&type, buf, len); | |
699 | if (ret > 0) { | |
700 | ret2 = snprintf(buf + ret, len - ret, "%s", tmp); | |
701 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
702 | } | |
703 | return ret; | |
704 | } | |
705 | ||
706 | /* Get the name and type of given variable DIE, stored as "type\tname" */ | |
707 | static int die_get_varname(Dwarf_Die *vr_die, char *buf, int len) | |
708 | { | |
709 | int ret, ret2; | |
710 | ||
711 | ret = die_get_typename(vr_die, buf, len); | |
712 | if (ret < 0) { | |
713 | pr_debug("Failed to get type, make it unknown.\n"); | |
714 | ret = snprintf(buf, len, "(unknown_type)"); | |
715 | } | |
716 | if (ret > 0) { | |
717 | ret2 = snprintf(buf + ret, len - ret, "\t%s", | |
718 | dwarf_diename(vr_die)); | |
719 | ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; | |
720 | } | |
721 | return ret; | |
722 | } | |
723 | ||
4ea42b18 MH |
724 | /* |
725 | * Probe finder related functions | |
726 | */ | |
727 | ||
0e60836b | 728 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 729 | { |
0e60836b SD |
730 | struct probe_trace_arg_ref *ref; |
731 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
732 | if (ref != NULL) |
733 | ref->offset = offs; | |
734 | return ref; | |
735 | } | |
736 | ||
cf6eb489 MH |
737 | /* |
738 | * Convert a location into trace_arg. | |
739 | * If tvar == NULL, this just checks variable can be converted. | |
740 | */ | |
741 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
742 | Dwarf_Op *fb_ops, | |
743 | struct probe_trace_arg *tvar) | |
4ea42b18 | 744 | { |
b7dcb857 MH |
745 | Dwarf_Attribute attr; |
746 | Dwarf_Op *op; | |
747 | size_t nops; | |
804b3606 MH |
748 | unsigned int regn; |
749 | Dwarf_Word offs = 0; | |
4235b045 | 750 | bool ref = false; |
4ea42b18 | 751 | const char *regs; |
b7dcb857 MH |
752 | int ret; |
753 | ||
632941c4 MH |
754 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
755 | goto static_var; | |
756 | ||
b7dcb857 MH |
757 | /* TODO: handle more than 1 exprs */ |
758 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 759 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
760 | nops == 0) { |
761 | /* TODO: Support const_value */ | |
b7dcb857 MH |
762 | return -ENOENT; |
763 | } | |
764 | ||
765 | if (op->atom == DW_OP_addr) { | |
632941c4 | 766 | static_var: |
cf6eb489 MH |
767 | if (!tvar) |
768 | return 0; | |
b7dcb857 MH |
769 | /* Static variables on memory (not stack), make @varname */ |
770 | ret = strlen(dwarf_diename(vr_die)); | |
771 | tvar->value = zalloc(ret + 2); | |
772 | if (tvar->value == NULL) | |
773 | return -ENOMEM; | |
774 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
775 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
776 | if (tvar->ref == NULL) | |
777 | return -ENOMEM; | |
778 | return 0; | |
779 | } | |
4ea42b18 | 780 | |
4ea42b18 | 781 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 782 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 783 | if (fb_ops == NULL) |
b55a87ad | 784 | return -ENOTSUP; |
4235b045 | 785 | ref = true; |
804b3606 | 786 | offs = op->number; |
cf6eb489 | 787 | op = &fb_ops[0]; |
804b3606 | 788 | } |
4ea42b18 | 789 | |
804b3606 MH |
790 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
791 | regn = op->atom - DW_OP_breg0; | |
792 | offs += op->number; | |
4235b045 | 793 | ref = true; |
804b3606 MH |
794 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
795 | regn = op->atom - DW_OP_reg0; | |
796 | } else if (op->atom == DW_OP_bregx) { | |
797 | regn = op->number; | |
798 | offs += op->number2; | |
4235b045 | 799 | ref = true; |
804b3606 MH |
800 | } else if (op->atom == DW_OP_regx) { |
801 | regn = op->number; | |
b55a87ad | 802 | } else { |
cf6eb489 | 803 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
804 | return -ENOTSUP; |
805 | } | |
4ea42b18 | 806 | |
cf6eb489 MH |
807 | if (!tvar) |
808 | return 0; | |
809 | ||
4ea42b18 | 810 | regs = get_arch_regstr(regn); |
b55a87ad | 811 | if (!regs) { |
cf6eb489 | 812 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
813 | pr_warning("Mapping for the register number %u " |
814 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
815 | return -ERANGE; |
816 | } | |
4ea42b18 | 817 | |
02b95dad MH |
818 | tvar->value = strdup(regs); |
819 | if (tvar->value == NULL) | |
820 | return -ENOMEM; | |
821 | ||
4235b045 | 822 | if (ref) { |
b7dcb857 | 823 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
824 | if (tvar->ref == NULL) |
825 | return -ENOMEM; | |
4235b045 | 826 | } |
b55a87ad | 827 | return 0; |
4ea42b18 MH |
828 | } |
829 | ||
b55a87ad | 830 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 831 | struct probe_trace_arg *tvar, |
73317b95 | 832 | const char *cast) |
4984912e | 833 | { |
0e60836b | 834 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
835 | Dwarf_Die type; |
836 | char buf[16]; | |
837 | int ret; | |
838 | ||
73317b95 MH |
839 | /* TODO: check all types */ |
840 | if (cast && strcmp(cast, "string") != 0) { | |
841 | /* Non string type is OK */ | |
842 | tvar->type = strdup(cast); | |
843 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
844 | } | |
845 | ||
b55a87ad MH |
846 | if (die_get_real_type(vr_die, &type) == NULL) { |
847 | pr_warning("Failed to get a type information of %s.\n", | |
848 | dwarf_diename(vr_die)); | |
849 | return -ENOENT; | |
850 | } | |
4984912e | 851 | |
b2a3c12b MH |
852 | pr_debug("%s type is %s.\n", |
853 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
854 | ||
73317b95 MH |
855 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
856 | ret = dwarf_tag(&type); | |
857 | if (ret != DW_TAG_pointer_type && | |
858 | ret != DW_TAG_array_type) { | |
859 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 860 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
861 | dwarf_diename(vr_die), dwarf_diename(&type)); |
862 | return -EINVAL; | |
863 | } | |
864 | if (ret == DW_TAG_pointer_type) { | |
865 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
866 | pr_warning("Failed to get a type" |
867 | " information.\n"); | |
73317b95 MH |
868 | return -ENOENT; |
869 | } | |
870 | while (*ref_ptr) | |
871 | ref_ptr = &(*ref_ptr)->next; | |
872 | /* Add new reference with offset +0 */ | |
0e60836b | 873 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
874 | if (*ref_ptr == NULL) { |
875 | pr_warning("Out of memory error\n"); | |
876 | return -ENOMEM; | |
877 | } | |
878 | } | |
82175633 MH |
879 | if (!die_compare_name(&type, "char") && |
880 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 881 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 882 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
883 | dwarf_diename(vr_die)); |
884 | return -EINVAL; | |
885 | } | |
886 | tvar->type = strdup(cast); | |
887 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
888 | } | |
889 | ||
4984912e MH |
890 | ret = die_get_byte_size(&type) * 8; |
891 | if (ret) { | |
892 | /* Check the bitwidth */ | |
893 | if (ret > MAX_BASIC_TYPE_BITS) { | |
b55a87ad MH |
894 | pr_info("%s exceeds max-bitwidth." |
895 | " Cut down to %d bits.\n", | |
896 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
4984912e MH |
897 | ret = MAX_BASIC_TYPE_BITS; |
898 | } | |
899 | ||
900 | ret = snprintf(buf, 16, "%c%d", | |
901 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
b55a87ad MH |
902 | if (ret < 0 || ret >= 16) { |
903 | if (ret >= 16) | |
904 | ret = -E2BIG; | |
905 | pr_warning("Failed to convert variable type: %s\n", | |
906 | strerror(-ret)); | |
907 | return ret; | |
908 | } | |
73317b95 MH |
909 | tvar->type = strdup(buf); |
910 | if (tvar->type == NULL) | |
02b95dad | 911 | return -ENOMEM; |
4984912e | 912 | } |
b55a87ad | 913 | return 0; |
4984912e MH |
914 | } |
915 | ||
b55a87ad | 916 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 917 | struct perf_probe_arg_field *field, |
0e60836b | 918 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 919 | Dwarf_Die *die_mem) |
7df2f329 | 920 | { |
0e60836b | 921 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
922 | Dwarf_Die type; |
923 | Dwarf_Word offs; | |
b2a3c12b | 924 | int ret, tag; |
7df2f329 MH |
925 | |
926 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
927 | if (die_get_real_type(vr_die, &type) == NULL) { |
928 | pr_warning("Failed to get the type of %s.\n", varname); | |
929 | return -ENOENT; | |
930 | } | |
b2a3c12b MH |
931 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
932 | tag = dwarf_tag(&type); | |
933 | ||
934 | if (field->name[0] == '[' && | |
935 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
936 | if (field->next) | |
937 | /* Save original type for next field */ | |
938 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
939 | /* Get the type of this array */ | |
940 | if (die_get_real_type(&type, &type) == NULL) { | |
941 | pr_warning("Failed to get the type of %s.\n", varname); | |
942 | return -ENOENT; | |
943 | } | |
944 | pr_debug2("Array real type: (%x)\n", | |
945 | (unsigned)dwarf_dieoffset(&type)); | |
946 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 947 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
948 | if (ref == NULL) |
949 | return -ENOMEM; | |
950 | if (*ref_ptr) | |
951 | (*ref_ptr)->next = ref; | |
952 | else | |
953 | *ref_ptr = ref; | |
954 | } | |
955 | ref->offset += die_get_byte_size(&type) * field->index; | |
956 | if (!field->next) | |
957 | /* Save vr_die for converting types */ | |
958 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
959 | goto next; | |
960 | } else if (tag == DW_TAG_pointer_type) { | |
961 | /* Check the pointer and dereference */ | |
b55a87ad MH |
962 | if (!field->ref) { |
963 | pr_err("Semantic error: %s must be referred by '->'\n", | |
964 | field->name); | |
965 | return -EINVAL; | |
966 | } | |
7df2f329 | 967 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
968 | if (die_get_real_type(&type, &type) == NULL) { |
969 | pr_warning("Failed to get the type of %s.\n", varname); | |
970 | return -ENOENT; | |
971 | } | |
12e5a7ae | 972 | /* Verify it is a data structure */ |
b55a87ad MH |
973 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
974 | pr_warning("%s is not a data structure.\n", varname); | |
975 | return -EINVAL; | |
976 | } | |
12e5a7ae | 977 | |
0e60836b | 978 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
979 | if (ref == NULL) |
980 | return -ENOMEM; | |
7df2f329 MH |
981 | if (*ref_ptr) |
982 | (*ref_ptr)->next = ref; | |
983 | else | |
984 | *ref_ptr = ref; | |
985 | } else { | |
12e5a7ae | 986 | /* Verify it is a data structure */ |
b2a3c12b | 987 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
988 | pr_warning("%s is not a data structure.\n", varname); |
989 | return -EINVAL; | |
990 | } | |
b2a3c12b | 991 | if (field->name[0] == '[') { |
0e43e5d2 MH |
992 | pr_err("Semantic error: %s is not a pointor" |
993 | " nor array.\n", varname); | |
b2a3c12b MH |
994 | return -EINVAL; |
995 | } | |
b55a87ad MH |
996 | if (field->ref) { |
997 | pr_err("Semantic error: %s must be referred by '.'\n", | |
998 | field->name); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | if (!ref) { | |
1002 | pr_warning("Structure on a register is not " | |
1003 | "supported yet.\n"); | |
1004 | return -ENOTSUP; | |
1005 | } | |
7df2f329 MH |
1006 | } |
1007 | ||
b55a87ad MH |
1008 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
1009 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
1010 | dwarf_diename(&type), field->name); | |
1011 | return -EINVAL; | |
1012 | } | |
7df2f329 MH |
1013 | |
1014 | /* Get the offset of the field */ | |
de1439d8 MH |
1015 | ret = die_get_data_member_location(die_mem, &offs); |
1016 | if (ret < 0) { | |
b55a87ad | 1017 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 1018 | return ret; |
b55a87ad | 1019 | } |
7df2f329 MH |
1020 | ref->offset += (long)offs; |
1021 | ||
b2a3c12b | 1022 | next: |
7df2f329 MH |
1023 | /* Converting next field */ |
1024 | if (field->next) | |
b55a87ad | 1025 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 1026 | field->next, &ref, die_mem); |
b55a87ad MH |
1027 | else |
1028 | return 0; | |
7df2f329 MH |
1029 | } |
1030 | ||
4ea42b18 | 1031 | /* Show a variables in kprobe event format */ |
b55a87ad | 1032 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 1033 | { |
4984912e | 1034 | Dwarf_Die die_mem; |
4ea42b18 MH |
1035 | int ret; |
1036 | ||
b7dcb857 MH |
1037 | pr_debug("Converting variable %s into trace event.\n", |
1038 | dwarf_diename(vr_die)); | |
804b3606 | 1039 | |
cf6eb489 MH |
1040 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
1041 | pf->tvar); | |
1042 | if (ret == -ENOENT) | |
1043 | pr_err("Failed to find the location of %s at this address.\n" | |
1044 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
1045 | else if (ret == -ENOTSUP) | |
1046 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
1047 | else if (pf->pvar->field) { | |
b55a87ad MH |
1048 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
1049 | pf->pvar->field, &pf->tvar->ref, | |
1050 | &die_mem); | |
4984912e MH |
1051 | vr_die = &die_mem; |
1052 | } | |
73317b95 MH |
1053 | if (ret == 0) |
1054 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 1055 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 1056 | return ret; |
4ea42b18 MH |
1057 | } |
1058 | ||
4ea42b18 | 1059 | /* Find a variable in a subprogram die */ |
b55a87ad | 1060 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 1061 | { |
b7dcb857 | 1062 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 1063 | char buf[32], *ptr; |
b7dcb857 | 1064 | int ret, nscopes; |
4ea42b18 | 1065 | |
367e94c1 MH |
1066 | if (!is_c_varname(pf->pvar->var)) { |
1067 | /* Copy raw parameters */ | |
1068 | pf->tvar->value = strdup(pf->pvar->var); | |
1069 | if (pf->tvar->value == NULL) | |
1070 | return -ENOMEM; | |
1071 | if (pf->pvar->type) { | |
1072 | pf->tvar->type = strdup(pf->pvar->type); | |
1073 | if (pf->tvar->type == NULL) | |
1074 | return -ENOMEM; | |
1075 | } | |
1076 | if (pf->pvar->name) { | |
1077 | pf->tvar->name = strdup(pf->pvar->name); | |
1078 | if (pf->tvar->name == NULL) | |
1079 | return -ENOMEM; | |
1080 | } else | |
1081 | pf->tvar->name = NULL; | |
1082 | return 0; | |
1083 | } | |
1084 | ||
48481938 | 1085 | if (pf->pvar->name) |
02b95dad | 1086 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 1087 | else { |
02b95dad MH |
1088 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
1089 | if (ret < 0) | |
1090 | return ret; | |
11a1ca35 MH |
1091 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
1092 | if (ptr) | |
1093 | *ptr = '_'; | |
02b95dad | 1094 | pf->tvar->name = strdup(buf); |
48481938 | 1095 | } |
02b95dad MH |
1096 | if (pf->tvar->name == NULL) |
1097 | return -ENOMEM; | |
48481938 | 1098 | |
b55a87ad MH |
1099 | pr_debug("Searching '%s' variable in context.\n", |
1100 | pf->pvar->var); | |
1101 | /* Search child die for local variables and parameters. */ | |
378eeaad | 1102 | if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die)) |
b7dcb857 MH |
1103 | ret = convert_variable(&vr_die, pf); |
1104 | else { | |
1105 | /* Search upper class */ | |
1106 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
632941c4 MH |
1107 | while (nscopes-- > 1) { |
1108 | pr_debug("Searching variables in %s\n", | |
1109 | dwarf_diename(&scopes[nscopes])); | |
1110 | /* We should check this scope, so give dummy address */ | |
1111 | if (die_find_variable_at(&scopes[nscopes], | |
1112 | pf->pvar->var, 0, | |
1113 | &vr_die)) { | |
b7dcb857 | 1114 | ret = convert_variable(&vr_die, pf); |
632941c4 MH |
1115 | goto found; |
1116 | } | |
1117 | } | |
1118 | if (scopes) | |
b7dcb857 | 1119 | free(scopes); |
632941c4 | 1120 | ret = -ENOENT; |
b7dcb857 | 1121 | } |
632941c4 | 1122 | found: |
b7dcb857 | 1123 | if (ret < 0) |
b55a87ad MH |
1124 | pr_warning("Failed to find '%s' in this function.\n", |
1125 | pf->pvar->var); | |
b7dcb857 | 1126 | return ret; |
4ea42b18 MH |
1127 | } |
1128 | ||
cf6eb489 MH |
1129 | /* Convert subprogram DIE to trace point */ |
1130 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
1131 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 1132 | { |
e92b85e1 | 1133 | Dwarf_Addr eaddr; |
804b3606 | 1134 | const char *name; |
e92b85e1 | 1135 | |
4235b045 | 1136 | /* Copy the name of probe point */ |
804b3606 MH |
1137 | name = dwarf_diename(sp_die); |
1138 | if (name) { | |
b55a87ad | 1139 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 1140 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
1141 | dwarf_diename(sp_die)); |
1142 | return -ENOENT; | |
1143 | } | |
cf6eb489 MH |
1144 | tp->symbol = strdup(name); |
1145 | if (tp->symbol == NULL) | |
02b95dad | 1146 | return -ENOMEM; |
cf6eb489 | 1147 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 1148 | } else |
4ea42b18 | 1149 | /* This function has no name. */ |
cf6eb489 | 1150 | tp->offset = (unsigned long)paddr; |
4235b045 | 1151 | |
04ddd04b | 1152 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
1153 | if (retprobe) { |
1154 | if (eaddr != paddr) { | |
04ddd04b | 1155 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 1156 | " a real function.\n"); |
04ddd04b MH |
1157 | return -EINVAL; |
1158 | } | |
cf6eb489 | 1159 | tp->retprobe = true; |
04ddd04b MH |
1160 | } |
1161 | ||
cf6eb489 MH |
1162 | return 0; |
1163 | } | |
1164 | ||
1165 | /* Call probe_finder callback with real subprogram DIE */ | |
1166 | static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1167 | { | |
1168 | Dwarf_Die die_mem; | |
1169 | Dwarf_Attribute fb_attr; | |
1170 | size_t nops; | |
1171 | int ret; | |
1172 | ||
1173 | /* If no real subprogram, find a real one */ | |
1174 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
1175 | sp_die = die_find_real_subprogram(&pf->cu_die, | |
1176 | pf->addr, &die_mem); | |
1177 | if (!sp_die) { | |
1178 | pr_warning("Failed to find probe point in any " | |
1179 | "functions.\n"); | |
1180 | return -ENOENT; | |
1181 | } | |
1182 | } | |
4ea42b18 | 1183 | |
804b3606 MH |
1184 | /* Get the frame base attribute/ops */ |
1185 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 1186 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 1187 | if (ret <= 0 || nops == 0) { |
804b3606 | 1188 | pf->fb_ops = NULL; |
7752f1b0 | 1189 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
1190 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
1191 | pf->cfi != NULL) { | |
1192 | Dwarf_Frame *frame; | |
b55a87ad MH |
1193 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
1194 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 1195 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
1196 | (uintmax_t)pf->addr); |
1197 | return -ENOENT; | |
1198 | } | |
7752f1b0 | 1199 | #endif |
a34a9854 | 1200 | } |
804b3606 | 1201 | |
cf6eb489 MH |
1202 | /* Call finder's callback handler */ |
1203 | ret = pf->callback(sp_die, pf); | |
804b3606 MH |
1204 | |
1205 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
1206 | pf->fb_ops = NULL; | |
cf6eb489 MH |
1207 | |
1208 | return ret; | |
4ea42b18 MH |
1209 | } |
1210 | ||
4cc9cec6 MH |
1211 | static int probe_point_line_walker(const char *fname, int lineno, |
1212 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 1213 | { |
4cc9cec6 MH |
1214 | struct probe_finder *pf = data; |
1215 | int ret; | |
4ea42b18 | 1216 | |
4cc9cec6 MH |
1217 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
1218 | return 0; | |
4ea42b18 | 1219 | |
4cc9cec6 MH |
1220 | pf->addr = addr; |
1221 | ret = call_probe_finder(NULL, pf); | |
b0ef0732 | 1222 | |
4cc9cec6 MH |
1223 | /* Continue if no error, because the line will be in inline function */ |
1224 | return ret < 0 ?: 0; | |
1225 | } | |
804b3606 | 1226 | |
4cc9cec6 MH |
1227 | /* Find probe point from its line number */ |
1228 | static int find_probe_point_by_line(struct probe_finder *pf) | |
1229 | { | |
1230 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
1231 | } |
1232 | ||
2a9c8c36 MH |
1233 | /* Find lines which match lazy pattern */ |
1234 | static int find_lazy_match_lines(struct list_head *head, | |
1235 | const char *fname, const char *pat) | |
1236 | { | |
f50c2169 FBH |
1237 | FILE *fp; |
1238 | char *line = NULL; | |
1239 | size_t line_len; | |
1240 | ssize_t len; | |
1241 | int count = 0, linenum = 1; | |
1242 | ||
1243 | fp = fopen(fname, "r"); | |
1244 | if (!fp) { | |
1245 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 1246 | return -errno; |
b55a87ad MH |
1247 | } |
1248 | ||
f50c2169 | 1249 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 1250 | |
f50c2169 FBH |
1251 | if (line[len - 1] == '\n') |
1252 | line[len - 1] = '\0'; | |
1253 | ||
1254 | if (strlazymatch(line, pat)) { | |
1255 | line_list__add_line(head, linenum); | |
1256 | count++; | |
2a9c8c36 | 1257 | } |
f50c2169 | 1258 | linenum++; |
2a9c8c36 | 1259 | } |
f50c2169 FBH |
1260 | |
1261 | if (ferror(fp)) | |
1262 | count = -errno; | |
1263 | free(line); | |
1264 | fclose(fp); | |
1265 | ||
1266 | if (count == 0) | |
1267 | pr_debug("No matched lines found in %s.\n", fname); | |
1268 | return count; | |
2a9c8c36 MH |
1269 | } |
1270 | ||
4cc9cec6 MH |
1271 | static int probe_point_lazy_walker(const char *fname, int lineno, |
1272 | Dwarf_Addr addr, void *data) | |
1273 | { | |
1274 | struct probe_finder *pf = data; | |
1275 | int ret; | |
1276 | ||
1277 | if (!line_list__has_line(&pf->lcache, lineno) || | |
1278 | strtailcmp(fname, pf->fname) != 0) | |
1279 | return 0; | |
1280 | ||
1281 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
1282 | lineno, (unsigned long long)addr); | |
1283 | pf->addr = addr; | |
1284 | ret = call_probe_finder(NULL, pf); | |
1285 | ||
1286 | /* | |
1287 | * Continue if no error, because the lazy pattern will match | |
1288 | * to other lines | |
1289 | */ | |
1290 | return ret < 0 ?: 0; | |
1291 | } | |
1292 | ||
2a9c8c36 | 1293 | /* Find probe points from lazy pattern */ |
b55a87ad | 1294 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 1295 | { |
b55a87ad | 1296 | int ret = 0; |
2a9c8c36 MH |
1297 | |
1298 | if (list_empty(&pf->lcache)) { | |
1299 | /* Matching lazy line pattern */ | |
1300 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 1301 | pf->pev->point.lazy_line); |
f50c2169 | 1302 | if (ret <= 0) |
b55a87ad | 1303 | return ret; |
2a9c8c36 MH |
1304 | } |
1305 | ||
4cc9cec6 | 1306 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
1307 | } |
1308 | ||
b55a87ad MH |
1309 | /* Callback parameter with return value */ |
1310 | struct dwarf_callback_param { | |
1311 | void *data; | |
1312 | int retval; | |
1313 | }; | |
1314 | ||
e92b85e1 MH |
1315 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1316 | { | |
b55a87ad MH |
1317 | struct dwarf_callback_param *param = data; |
1318 | struct probe_finder *pf = param->data; | |
4235b045 | 1319 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1320 | Dwarf_Addr addr; |
e92b85e1 | 1321 | |
2a9c8c36 | 1322 | if (pp->lazy_line) |
b55a87ad | 1323 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1324 | else { |
1325 | /* Get probe address */ | |
b55a87ad | 1326 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 1327 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad MH |
1328 | dwarf_diename(in_die)); |
1329 | param->retval = -ENOENT; | |
1330 | return DWARF_CB_ABORT; | |
1331 | } | |
1332 | pf->addr = addr; | |
2a9c8c36 MH |
1333 | pf->addr += pp->offset; |
1334 | pr_debug("found inline addr: 0x%jx\n", | |
1335 | (uintmax_t)pf->addr); | |
1336 | ||
cf6eb489 | 1337 | param->retval = call_probe_finder(in_die, pf); |
5d1ee041 MH |
1338 | if (param->retval < 0) |
1339 | return DWARF_CB_ABORT; | |
2a9c8c36 | 1340 | } |
e92b85e1 | 1341 | |
e92b85e1 MH |
1342 | return DWARF_CB_OK; |
1343 | } | |
804b3606 | 1344 | |
4ea42b18 | 1345 | /* Search function from function name */ |
e92b85e1 | 1346 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1347 | { |
b55a87ad MH |
1348 | struct dwarf_callback_param *param = data; |
1349 | struct probe_finder *pf = param->data; | |
4235b045 | 1350 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1351 | |
e92b85e1 MH |
1352 | /* Check tag and diename */ |
1353 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 1354 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 1355 | return DWARF_CB_OK; |
e92b85e1 | 1356 | |
2a9c8c36 | 1357 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1358 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1359 | dwarf_decl_line(sp_die, &pf->lno); |
1360 | pf->lno += pp->line; | |
b55a87ad | 1361 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1362 | } else if (!dwarf_func_inline(sp_die)) { |
1363 | /* Real function */ | |
2a9c8c36 | 1364 | if (pp->lazy_line) |
b55a87ad | 1365 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1366 | else { |
b55a87ad | 1367 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
1368 | pr_warning("Failed to get entry address of " |
1369 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1370 | param->retval = -ENOENT; |
1371 | return DWARF_CB_ABORT; | |
1372 | } | |
2a9c8c36 MH |
1373 | pf->addr += pp->offset; |
1374 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1375 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1376 | } |
b55a87ad MH |
1377 | } else { |
1378 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1379 | .retval = 0}; | |
e92b85e1 | 1380 | /* Inlined function: search instances */ |
b55a87ad MH |
1381 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1382 | &_param); | |
1383 | param->retval = _param.retval; | |
1384 | } | |
e92b85e1 | 1385 | |
b55a87ad | 1386 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1387 | } |
1388 | ||
b55a87ad | 1389 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1390 | { |
b55a87ad MH |
1391 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1392 | .retval = 0}; | |
1393 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1394 | return _param.retval; | |
4ea42b18 MH |
1395 | } |
1396 | ||
cf6eb489 MH |
1397 | /* Find probe points from debuginfo */ |
1398 | static int find_probes(int fd, struct probe_finder *pf) | |
4ea42b18 | 1399 | { |
cf6eb489 | 1400 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1401 | Dwarf_Off off, noff; |
1402 | size_t cuhl; | |
1403 | Dwarf_Die *diep; | |
469b9b88 MH |
1404 | Dwarf *dbg = NULL; |
1405 | Dwfl *dwfl; | |
1406 | Dwarf_Addr bias; /* Currently ignored */ | |
b55a87ad | 1407 | int ret = 0; |
804b3606 | 1408 | |
469b9b88 | 1409 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1410 | if (!dbg) { |
0e43e5d2 | 1411 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad MH |
1412 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1413 | return -EBADF; | |
1414 | } | |
4ea42b18 | 1415 | |
7752f1b0 | 1416 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1417 | /* Get the call frame information from this dwarf */ |
cf6eb489 | 1418 | pf->cfi = dwarf_getcfi(dbg); |
7752f1b0 | 1419 | #endif |
a34a9854 | 1420 | |
804b3606 | 1421 | off = 0; |
cf6eb489 | 1422 | line_list__init(&pf->lcache); |
804b3606 | 1423 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1424 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) && |
1425 | ret >= 0) { | |
4ea42b18 | 1426 | /* Get the DIE(Debugging Information Entry) of this CU */ |
cf6eb489 | 1427 | diep = dwarf_offdie(dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1428 | if (!diep) |
1429 | continue; | |
4ea42b18 MH |
1430 | |
1431 | /* Check if target file is included. */ | |
1432 | if (pp->file) | |
cf6eb489 | 1433 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1434 | else |
cf6eb489 | 1435 | pf->fname = NULL; |
4ea42b18 | 1436 | |
cf6eb489 | 1437 | if (!pp->file || pf->fname) { |
4ea42b18 | 1438 | if (pp->function) |
cf6eb489 | 1439 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1440 | else if (pp->lazy_line) |
cf6eb489 | 1441 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1442 | else { |
cf6eb489 MH |
1443 | pf->lno = pp->line; |
1444 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1445 | } |
4ea42b18 | 1446 | } |
804b3606 | 1447 | off = noff; |
4ea42b18 | 1448 | } |
cf6eb489 | 1449 | line_list__free(&pf->lcache); |
469b9b88 MH |
1450 | if (dwfl) |
1451 | dwfl_end(dwfl); | |
4ea42b18 | 1452 | |
cf6eb489 MH |
1453 | return ret; |
1454 | } | |
1455 | ||
1456 | /* Add a found probe point into trace event list */ | |
1457 | static int add_probe_trace_event(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1458 | { | |
1459 | struct trace_event_finder *tf = | |
1460 | container_of(pf, struct trace_event_finder, pf); | |
1461 | struct probe_trace_event *tev; | |
1462 | int ret, i; | |
1463 | ||
1464 | /* Check number of tevs */ | |
1465 | if (tf->ntevs == tf->max_tevs) { | |
1466 | pr_warning("Too many( > %d) probe point found.\n", | |
1467 | tf->max_tevs); | |
1468 | return -ERANGE; | |
1469 | } | |
1470 | tev = &tf->tevs[tf->ntevs++]; | |
1471 | ||
1472 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1473 | &tev->point); | |
1474 | if (ret < 0) | |
1475 | return ret; | |
1476 | ||
1477 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1478 | tev->point.offset); | |
1479 | ||
1480 | /* Find each argument */ | |
1481 | tev->nargs = pf->pev->nargs; | |
1482 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1483 | if (tev->args == NULL) | |
1484 | return -ENOMEM; | |
1485 | for (i = 0; i < pf->pev->nargs; i++) { | |
1486 | pf->pvar = &pf->pev->args[i]; | |
1487 | pf->tvar = &tev->args[i]; | |
1488 | ret = find_variable(sp_die, pf); | |
1489 | if (ret != 0) | |
1490 | return ret; | |
1491 | } | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
1497 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1498 | struct probe_trace_event **tevs, int max_tevs) | |
1499 | { | |
1500 | struct trace_event_finder tf = { | |
1501 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1502 | .max_tevs = max_tevs}; | |
1503 | int ret; | |
1504 | ||
1505 | /* Allocate result tevs array */ | |
1506 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1507 | if (*tevs == NULL) | |
1508 | return -ENOMEM; | |
1509 | ||
1510 | tf.tevs = *tevs; | |
1511 | tf.ntevs = 0; | |
1512 | ||
1513 | ret = find_probes(fd, &tf.pf); | |
1514 | if (ret < 0) { | |
1515 | free(*tevs); | |
1516 | *tevs = NULL; | |
1517 | return ret; | |
1518 | } | |
1519 | ||
1520 | return (ret < 0) ? ret : tf.ntevs; | |
1521 | } | |
1522 | ||
1523 | #define MAX_VAR_LEN 64 | |
1524 | ||
1525 | /* Collect available variables in this scope */ | |
1526 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1527 | { | |
1528 | struct available_var_finder *af = data; | |
1529 | struct variable_list *vl; | |
1530 | char buf[MAX_VAR_LEN]; | |
1531 | int tag, ret; | |
1532 | ||
1533 | vl = &af->vls[af->nvls - 1]; | |
1534 | ||
1535 | tag = dwarf_tag(die_mem); | |
1536 | if (tag == DW_TAG_formal_parameter || | |
1537 | tag == DW_TAG_variable) { | |
1538 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1539 | af->pf.fb_ops, NULL); | |
1540 | if (ret == 0) { | |
1541 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1542 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1543 | if (ret > 0) |
1544 | strlist__add(vl->vars, buf); | |
1545 | } | |
1546 | } | |
1547 | ||
fb8c5a56 | 1548 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1549 | return DIE_FIND_CB_CONTINUE; |
1550 | else | |
1551 | return DIE_FIND_CB_SIBLING; | |
1552 | } | |
1553 | ||
1554 | /* Add a found vars into available variables list */ | |
1555 | static int add_available_vars(Dwarf_Die *sp_die, struct probe_finder *pf) | |
1556 | { | |
1557 | struct available_var_finder *af = | |
1558 | container_of(pf, struct available_var_finder, pf); | |
1559 | struct variable_list *vl; | |
fb8c5a56 MH |
1560 | Dwarf_Die die_mem, *scopes = NULL; |
1561 | int ret, nscopes; | |
cf6eb489 MH |
1562 | |
1563 | /* Check number of tevs */ | |
1564 | if (af->nvls == af->max_vls) { | |
1565 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1566 | return -ERANGE; | |
1567 | } | |
1568 | vl = &af->vls[af->nvls++]; | |
1569 | ||
1570 | ret = convert_to_trace_point(sp_die, pf->addr, pf->pev->point.retprobe, | |
1571 | &vl->point); | |
1572 | if (ret < 0) | |
1573 | return ret; | |
1574 | ||
1575 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1576 | vl->point.offset); | |
1577 | ||
1578 | /* Find local variables */ | |
1579 | vl->vars = strlist__new(true, NULL); | |
1580 | if (vl->vars == NULL) | |
1581 | return -ENOMEM; | |
fb8c5a56 | 1582 | af->child = true; |
cf6eb489 MH |
1583 | die_find_child(sp_die, collect_variables_cb, (void *)af, &die_mem); |
1584 | ||
fb8c5a56 MH |
1585 | /* Find external variables */ |
1586 | if (!af->externs) | |
1587 | goto out; | |
1588 | /* Don't need to search child DIE for externs. */ | |
1589 | af->child = false; | |
1590 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
1591 | while (nscopes-- > 1) | |
1592 | die_find_child(&scopes[nscopes], collect_variables_cb, | |
1593 | (void *)af, &die_mem); | |
1594 | if (scopes) | |
1595 | free(scopes); | |
1596 | ||
1597 | out: | |
cf6eb489 MH |
1598 | if (strlist__empty(vl->vars)) { |
1599 | strlist__delete(vl->vars); | |
1600 | vl->vars = NULL; | |
1601 | } | |
1602 | ||
1603 | return ret; | |
1604 | } | |
1605 | ||
1606 | /* Find available variables at given probe point */ | |
1607 | int find_available_vars_at(int fd, struct perf_probe_event *pev, | |
fb8c5a56 MH |
1608 | struct variable_list **vls, int max_vls, |
1609 | bool externs) | |
cf6eb489 MH |
1610 | { |
1611 | struct available_var_finder af = { | |
1612 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1613 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1614 | int ret; |
1615 | ||
1616 | /* Allocate result vls array */ | |
1617 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1618 | if (*vls == NULL) | |
1619 | return -ENOMEM; | |
1620 | ||
1621 | af.vls = *vls; | |
1622 | af.nvls = 0; | |
1623 | ||
1624 | ret = find_probes(fd, &af.pf); | |
1625 | if (ret < 0) { | |
1626 | /* Free vlist for error */ | |
1627 | while (af.nvls--) { | |
1628 | if (af.vls[af.nvls].point.symbol) | |
1629 | free(af.vls[af.nvls].point.symbol); | |
1630 | if (af.vls[af.nvls].vars) | |
1631 | strlist__delete(af.vls[af.nvls].vars); | |
1632 | } | |
1633 | free(af.vls); | |
1634 | *vls = NULL; | |
1635 | return ret; | |
1636 | } | |
1637 | ||
1638 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1639 | } |
1640 | ||
fb1587d8 | 1641 | /* Reverse search */ |
469b9b88 | 1642 | int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt) |
fb1587d8 MH |
1643 | { |
1644 | Dwarf_Die cudie, spdie, indie; | |
469b9b88 MH |
1645 | Dwarf *dbg = NULL; |
1646 | Dwfl *dwfl = NULL; | |
fb1587d8 | 1647 | Dwarf_Line *line; |
469b9b88 | 1648 | Dwarf_Addr laddr, eaddr, bias = 0; |
fb1587d8 MH |
1649 | const char *tmp; |
1650 | int lineno, ret = 0; | |
b55a87ad | 1651 | bool found = false; |
fb1587d8 | 1652 | |
469b9b88 MH |
1653 | /* Open the live linux kernel */ |
1654 | dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias); | |
1655 | if (!dbg) { | |
0e43e5d2 | 1656 | pr_warning("No debug information found in the vmlinux - " |
469b9b88 MH |
1657 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1658 | ret = -EINVAL; | |
1659 | goto end; | |
1660 | } | |
fb1587d8 | 1661 | |
469b9b88 MH |
1662 | /* Adjust address with bias */ |
1663 | addr += bias; | |
fb1587d8 | 1664 | /* Find cu die */ |
469b9b88 | 1665 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) { |
0e43e5d2 MH |
1666 | pr_warning("Failed to find debug information for address %lx\n", |
1667 | addr); | |
75ec5a24 MH |
1668 | ret = -EINVAL; |
1669 | goto end; | |
1670 | } | |
fb1587d8 MH |
1671 | |
1672 | /* Find a corresponding line */ | |
1673 | line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr); | |
1674 | if (line) { | |
b55a87ad MH |
1675 | if (dwarf_lineaddr(line, &laddr) == 0 && |
1676 | (Dwarf_Addr)addr == laddr && | |
1677 | dwarf_lineno(line, &lineno) == 0) { | |
fb1587d8 | 1678 | tmp = dwarf_linesrc(line, NULL, NULL); |
b55a87ad MH |
1679 | if (tmp) { |
1680 | ppt->line = lineno; | |
02b95dad MH |
1681 | ppt->file = strdup(tmp); |
1682 | if (ppt->file == NULL) { | |
1683 | ret = -ENOMEM; | |
1684 | goto end; | |
1685 | } | |
b55a87ad MH |
1686 | found = true; |
1687 | } | |
fb1587d8 MH |
1688 | } |
1689 | } | |
1690 | ||
1691 | /* Find a corresponding function */ | |
1692 | if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) { | |
1693 | tmp = dwarf_diename(&spdie); | |
b55a87ad | 1694 | if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0) |
fb1587d8 MH |
1695 | goto end; |
1696 | ||
b55a87ad MH |
1697 | if (ppt->line) { |
1698 | if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1699 | &indie)) { | |
1700 | /* addr in an inline function */ | |
1701 | tmp = dwarf_diename(&indie); | |
1702 | if (!tmp) | |
1703 | goto end; | |
1704 | ret = dwarf_decl_line(&indie, &lineno); | |
1705 | } else { | |
1706 | if (eaddr == addr) { /* Function entry */ | |
1707 | lineno = ppt->line; | |
1708 | ret = 0; | |
1709 | } else | |
1710 | ret = dwarf_decl_line(&spdie, &lineno); | |
1711 | } | |
1712 | if (ret == 0) { | |
1713 | /* Make a relative line number */ | |
1714 | ppt->line -= lineno; | |
1715 | goto found; | |
1716 | } | |
fb1587d8 | 1717 | } |
b55a87ad MH |
1718 | /* We don't have a line number, let's use offset */ |
1719 | ppt->offset = addr - (unsigned long)eaddr; | |
1720 | found: | |
02b95dad MH |
1721 | ppt->function = strdup(tmp); |
1722 | if (ppt->function == NULL) { | |
1723 | ret = -ENOMEM; | |
1724 | goto end; | |
1725 | } | |
b55a87ad | 1726 | found = true; |
fb1587d8 MH |
1727 | } |
1728 | ||
1729 | end: | |
469b9b88 MH |
1730 | if (dwfl) |
1731 | dwfl_end(dwfl); | |
b55a87ad MH |
1732 | if (ret >= 0) |
1733 | ret = found ? 1 : 0; | |
fb1587d8 MH |
1734 | return ret; |
1735 | } | |
1736 | ||
f6c903f5 MH |
1737 | /* Add a line and store the src path */ |
1738 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1739 | struct line_range *lr) | |
1740 | { | |
7cf0b79e | 1741 | /* Copy source path */ |
f6c903f5 | 1742 | if (!lr->path) { |
7cf0b79e MH |
1743 | lr->path = strdup(src); |
1744 | if (lr->path == NULL) | |
1745 | return -ENOMEM; | |
f6c903f5 MH |
1746 | } |
1747 | return line_list__add_line(&lr->line_list, lineno); | |
1748 | } | |
1749 | ||
4cc9cec6 MH |
1750 | static int line_range_walk_cb(const char *fname, int lineno, |
1751 | Dwarf_Addr addr __used, | |
1752 | void *data) | |
f6c903f5 | 1753 | { |
4cc9cec6 | 1754 | struct line_finder *lf = data; |
f6c903f5 | 1755 | |
4cc9cec6 | 1756 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1757 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1758 | return 0; |
f6c903f5 | 1759 | |
4cc9cec6 MH |
1760 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1761 | return -EINVAL; | |
f6c903f5 | 1762 | |
4cc9cec6 | 1763 | return 0; |
f6c903f5 | 1764 | } |
fb1587d8 | 1765 | |
631c9def | 1766 | /* Find line range from its line number */ |
b55a87ad | 1767 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1768 | { |
4cc9cec6 | 1769 | int ret; |
f6c903f5 | 1770 | |
4cc9cec6 | 1771 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1772 | |
804b3606 | 1773 | /* Update status */ |
f6c903f5 MH |
1774 | if (ret >= 0) |
1775 | if (!list_empty(&lf->lr->line_list)) | |
1776 | ret = lf->found = 1; | |
1777 | else | |
1778 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1779 | else { |
1780 | free(lf->lr->path); | |
1781 | lf->lr->path = NULL; | |
1782 | } | |
f6c903f5 | 1783 | return ret; |
631c9def MH |
1784 | } |
1785 | ||
161a26b0 MH |
1786 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1787 | { | |
b55a87ad MH |
1788 | struct dwarf_callback_param *param = data; |
1789 | ||
1790 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1791 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1792 | } | |
1793 | ||
631c9def | 1794 | /* Search function from function name */ |
e92b85e1 | 1795 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1796 | { |
b55a87ad MH |
1797 | struct dwarf_callback_param *param = data; |
1798 | struct line_finder *lf = param->data; | |
631c9def | 1799 | struct line_range *lr = lf->lr; |
631c9def | 1800 | |
e92b85e1 | 1801 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1802 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1803 | lf->fname = dwarf_decl_file(sp_die); |
1804 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1805 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1806 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1807 | if (lf->lno_s < 0) /* Overflow */ |
1808 | lf->lno_s = INT_MAX; | |
1809 | lf->lno_e = lr->offset + lr->end; | |
1810 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1811 | lf->lno_e = INT_MAX; |
d3b63d7a | 1812 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1813 | lr->start = lf->lno_s; |
1814 | lr->end = lf->lno_e; | |
b55a87ad MH |
1815 | if (dwarf_func_inline(sp_die)) { |
1816 | struct dwarf_callback_param _param; | |
1817 | _param.data = (void *)lf; | |
1818 | _param.retval = 0; | |
161a26b0 | 1819 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1820 | line_range_inline_cb, |
1821 | &_param); | |
1822 | param->retval = _param.retval; | |
1823 | } else | |
1824 | param->retval = find_line_range_by_line(sp_die, lf); | |
1825 | return DWARF_CB_ABORT; | |
631c9def | 1826 | } |
b55a87ad | 1827 | return DWARF_CB_OK; |
631c9def MH |
1828 | } |
1829 | ||
b55a87ad | 1830 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1831 | { |
b55a87ad MH |
1832 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1833 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1834 | return param.retval; | |
631c9def MH |
1835 | } |
1836 | ||
1837 | int find_line_range(int fd, struct line_range *lr) | |
1838 | { | |
804b3606 | 1839 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1840 | int ret = 0; |
804b3606 MH |
1841 | Dwarf_Off off = 0, noff; |
1842 | size_t cuhl; | |
1843 | Dwarf_Die *diep; | |
469b9b88 MH |
1844 | Dwarf *dbg = NULL; |
1845 | Dwfl *dwfl; | |
1846 | Dwarf_Addr bias; /* Currently ignored */ | |
6a330a3c | 1847 | const char *comp_dir; |
804b3606 | 1848 | |
469b9b88 | 1849 | dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias); |
b55a87ad | 1850 | if (!dbg) { |
0e43e5d2 | 1851 | pr_warning("No debug information found in the vmlinux - " |
b55a87ad MH |
1852 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); |
1853 | return -EBADF; | |
1854 | } | |
631c9def | 1855 | |
804b3606 | 1856 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1857 | while (!lf.found && ret >= 0) { |
1858 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
1859 | break; |
1860 | ||
1861 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
1862 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
1863 | if (!diep) | |
1864 | continue; | |
631c9def MH |
1865 | |
1866 | /* Check if target file is included. */ | |
1867 | if (lr->file) | |
2a9c8c36 | 1868 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1869 | else |
2a9c8c36 | 1870 | lf.fname = 0; |
631c9def | 1871 | |
2a9c8c36 | 1872 | if (!lr->file || lf.fname) { |
631c9def | 1873 | if (lr->function) |
b55a87ad | 1874 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1875 | else { |
1876 | lf.lno_s = lr->start; | |
d3b63d7a | 1877 | lf.lno_e = lr->end; |
b55a87ad | 1878 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1879 | } |
631c9def | 1880 | } |
804b3606 | 1881 | off = noff; |
631c9def | 1882 | } |
6a330a3c MH |
1883 | |
1884 | /* Store comp_dir */ | |
1885 | if (lf.found) { | |
1886 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1887 | if (comp_dir) { | |
1888 | lr->comp_dir = strdup(comp_dir); | |
1889 | if (!lr->comp_dir) | |
1890 | ret = -ENOMEM; | |
1891 | } | |
1892 | } | |
1893 | ||
7cf0b79e | 1894 | pr_debug("path: %s\n", lr->path); |
469b9b88 | 1895 | dwfl_end(dwfl); |
b55a87ad | 1896 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1897 | } |
1898 |