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Commit | Line | Data |
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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 | ||
119 | /* Dwarf wrappers */ | |
120 | ||
121 | /* Find the realpath of the target file. */ | |
122 | static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) | |
4ea42b18 | 123 | { |
804b3606 MH |
124 | Dwarf_Files *files; |
125 | size_t nfiles, i; | |
accd3cc4 | 126 | const char *src = NULL; |
4ea42b18 MH |
127 | int ret; |
128 | ||
129 | if (!fname) | |
2a9c8c36 | 130 | return NULL; |
4ea42b18 | 131 | |
804b3606 | 132 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
2a9c8c36 MH |
133 | if (ret != 0) |
134 | return NULL; | |
135 | ||
136 | for (i = 0; i < nfiles; i++) { | |
137 | src = dwarf_filesrc(files, i, NULL, NULL); | |
138 | if (strtailcmp(src, fname) == 0) | |
139 | break; | |
4ea42b18 | 140 | } |
c9e38582 MH |
141 | if (i == nfiles) |
142 | return NULL; | |
2a9c8c36 | 143 | return src; |
4ea42b18 MH |
144 | } |
145 | ||
6a330a3c MH |
146 | /* Get DW_AT_comp_dir (should be NULL with older gcc) */ |
147 | static const char *cu_get_comp_dir(Dwarf_Die *cu_die) | |
148 | { | |
149 | Dwarf_Attribute attr; | |
150 | if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) | |
151 | return NULL; | |
152 | return dwarf_formstring(&attr); | |
153 | } | |
154 | ||
016f262e MH |
155 | /* Compare diename and tname */ |
156 | static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) | |
157 | { | |
158 | const char *name; | |
159 | name = dwarf_diename(dw_die); | |
82175633 | 160 | return name ? (strcmp(tname, name) == 0) : false; |
016f262e MH |
161 | } |
162 | ||
7df2f329 MH |
163 | /* Get type die, but skip qualifiers and typedef */ |
164 | static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) | |
165 | { | |
166 | Dwarf_Attribute attr; | |
167 | int tag; | |
168 | ||
169 | do { | |
170 | if (dwarf_attr(vr_die, DW_AT_type, &attr) == NULL || | |
171 | dwarf_formref_die(&attr, die_mem) == NULL) | |
172 | return NULL; | |
173 | ||
174 | tag = dwarf_tag(die_mem); | |
175 | vr_die = die_mem; | |
176 | } while (tag == DW_TAG_const_type || | |
177 | tag == DW_TAG_restrict_type || | |
178 | tag == DW_TAG_volatile_type || | |
179 | tag == DW_TAG_shared_type || | |
180 | tag == DW_TAG_typedef); | |
181 | ||
182 | return die_mem; | |
183 | } | |
184 | ||
4984912e MH |
185 | static bool die_is_signed_type(Dwarf_Die *tp_die) |
186 | { | |
187 | Dwarf_Attribute attr; | |
188 | Dwarf_Word ret; | |
189 | ||
190 | if (dwarf_attr(tp_die, DW_AT_encoding, &attr) == NULL || | |
191 | dwarf_formudata(&attr, &ret) != 0) | |
192 | return false; | |
193 | ||
194 | return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || | |
195 | ret == DW_ATE_signed_fixed); | |
196 | } | |
197 | ||
198 | static int die_get_byte_size(Dwarf_Die *tp_die) | |
199 | { | |
200 | Dwarf_Attribute attr; | |
201 | Dwarf_Word ret; | |
202 | ||
203 | if (dwarf_attr(tp_die, DW_AT_byte_size, &attr) == NULL || | |
204 | dwarf_formudata(&attr, &ret) != 0) | |
205 | return 0; | |
206 | ||
207 | return (int)ret; | |
208 | } | |
209 | ||
de1439d8 MH |
210 | /* Get data_member_location offset */ |
211 | static int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) | |
212 | { | |
213 | Dwarf_Attribute attr; | |
214 | Dwarf_Op *expr; | |
215 | size_t nexpr; | |
216 | int ret; | |
217 | ||
218 | if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) | |
219 | return -ENOENT; | |
220 | ||
221 | if (dwarf_formudata(&attr, offs) != 0) { | |
222 | /* DW_AT_data_member_location should be DW_OP_plus_uconst */ | |
223 | ret = dwarf_getlocation(&attr, &expr, &nexpr); | |
224 | if (ret < 0 || nexpr == 0) | |
225 | return -ENOENT; | |
226 | ||
227 | if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { | |
228 | pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", | |
229 | expr[0].atom, nexpr); | |
230 | return -ENOTSUP; | |
231 | } | |
232 | *offs = (Dwarf_Word)expr[0].number; | |
233 | } | |
234 | return 0; | |
235 | } | |
236 | ||
016f262e MH |
237 | /* Return values for die_find callbacks */ |
238 | enum { | |
239 | DIE_FIND_CB_FOUND = 0, /* End of Search */ | |
240 | DIE_FIND_CB_CHILD = 1, /* Search only children */ | |
241 | DIE_FIND_CB_SIBLING = 2, /* Search only siblings */ | |
242 | DIE_FIND_CB_CONTINUE = 3, /* Search children and siblings */ | |
243 | }; | |
244 | ||
245 | /* Search a child die */ | |
246 | static Dwarf_Die *die_find_child(Dwarf_Die *rt_die, | |
247 | int (*callback)(Dwarf_Die *, void *), | |
248 | void *data, Dwarf_Die *die_mem) | |
249 | { | |
250 | Dwarf_Die child_die; | |
251 | int ret; | |
252 | ||
253 | ret = dwarf_child(rt_die, die_mem); | |
254 | if (ret != 0) | |
255 | return NULL; | |
256 | ||
257 | do { | |
258 | ret = callback(die_mem, data); | |
259 | if (ret == DIE_FIND_CB_FOUND) | |
260 | return die_mem; | |
261 | ||
262 | if ((ret & DIE_FIND_CB_CHILD) && | |
263 | die_find_child(die_mem, callback, data, &child_die)) { | |
264 | memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); | |
265 | return die_mem; | |
266 | } | |
267 | } while ((ret & DIE_FIND_CB_SIBLING) && | |
268 | dwarf_siblingof(die_mem, die_mem) == 0); | |
269 | ||
270 | return NULL; | |
271 | } | |
272 | ||
804b3606 MH |
273 | struct __addr_die_search_param { |
274 | Dwarf_Addr addr; | |
275 | Dwarf_Die *die_mem; | |
276 | }; | |
277 | ||
278 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) | |
631c9def | 279 | { |
804b3606 | 280 | struct __addr_die_search_param *ad = data; |
631c9def | 281 | |
804b3606 MH |
282 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
283 | dwarf_haspc(fn_die, ad->addr)) { | |
284 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); | |
285 | return DWARF_CB_ABORT; | |
286 | } | |
287 | return DWARF_CB_OK; | |
288 | } | |
631c9def | 289 | |
804b3606 | 290 | /* Search a real subprogram including this line, */ |
95a3e4c4 MH |
291 | static Dwarf_Die *die_find_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
292 | Dwarf_Die *die_mem) | |
804b3606 MH |
293 | { |
294 | struct __addr_die_search_param ad; | |
295 | ad.addr = addr; | |
296 | ad.die_mem = die_mem; | |
297 | /* dwarf_getscopes can't find subprogram. */ | |
298 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) | |
299 | return NULL; | |
300 | else | |
301 | return die_mem; | |
631c9def MH |
302 | } |
303 | ||
016f262e MH |
304 | /* die_find callback for inline function search */ |
305 | static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) | |
161a26b0 | 306 | { |
016f262e | 307 | Dwarf_Addr *addr = data; |
161a26b0 | 308 | |
016f262e MH |
309 | if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && |
310 | dwarf_haspc(die_mem, *addr)) | |
311 | return DIE_FIND_CB_FOUND; | |
161a26b0 | 312 | |
016f262e | 313 | return DIE_FIND_CB_CONTINUE; |
161a26b0 MH |
314 | } |
315 | ||
016f262e MH |
316 | /* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ |
317 | static Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, | |
318 | Dwarf_Die *die_mem) | |
4ea42b18 | 319 | { |
016f262e | 320 | return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); |
4ea42b18 MH |
321 | } |
322 | ||
016f262e | 323 | static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) |
4ea42b18 | 324 | { |
016f262e MH |
325 | const char *name = data; |
326 | int tag; | |
4ea42b18 | 327 | |
016f262e MH |
328 | tag = dwarf_tag(die_mem); |
329 | if ((tag == DW_TAG_formal_parameter || | |
330 | tag == DW_TAG_variable) && | |
82175633 | 331 | die_compare_name(die_mem, name)) |
016f262e MH |
332 | return DIE_FIND_CB_FOUND; |
333 | ||
334 | return DIE_FIND_CB_CONTINUE; | |
4ea42b18 MH |
335 | } |
336 | ||
016f262e | 337 | /* Find a variable called 'name' */ |
e92b85e1 MH |
338 | static Dwarf_Die *die_find_variable(Dwarf_Die *sp_die, const char *name, |
339 | Dwarf_Die *die_mem) | |
4ea42b18 | 340 | { |
016f262e MH |
341 | return die_find_child(sp_die, __die_find_variable_cb, (void *)name, |
342 | die_mem); | |
4ea42b18 MH |
343 | } |
344 | ||
7df2f329 MH |
345 | static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) |
346 | { | |
347 | const char *name = data; | |
348 | ||
349 | if ((dwarf_tag(die_mem) == DW_TAG_member) && | |
82175633 | 350 | die_compare_name(die_mem, name)) |
7df2f329 MH |
351 | return DIE_FIND_CB_FOUND; |
352 | ||
353 | return DIE_FIND_CB_SIBLING; | |
354 | } | |
355 | ||
356 | /* Find a member called 'name' */ | |
357 | static Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, | |
358 | Dwarf_Die *die_mem) | |
359 | { | |
360 | return die_find_child(st_die, __die_find_member_cb, (void *)name, | |
361 | die_mem); | |
362 | } | |
363 | ||
4ea42b18 MH |
364 | /* |
365 | * Probe finder related functions | |
366 | */ | |
367 | ||
0e60836b | 368 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 369 | { |
0e60836b SD |
370 | struct probe_trace_arg_ref *ref; |
371 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
372 | if (ref != NULL) |
373 | ref->offset = offs; | |
374 | return ref; | |
375 | } | |
376 | ||
4ea42b18 | 377 | /* Show a location */ |
b7dcb857 | 378 | static int convert_variable_location(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 379 | { |
b7dcb857 MH |
380 | Dwarf_Attribute attr; |
381 | Dwarf_Op *op; | |
382 | size_t nops; | |
804b3606 MH |
383 | unsigned int regn; |
384 | Dwarf_Word offs = 0; | |
4235b045 | 385 | bool ref = false; |
4ea42b18 | 386 | const char *regs; |
0e60836b | 387 | struct probe_trace_arg *tvar = pf->tvar; |
b7dcb857 MH |
388 | int ret; |
389 | ||
390 | /* TODO: handle more than 1 exprs */ | |
391 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
392 | dwarf_getlocation_addr(&attr, pf->addr, &op, &nops, 1) <= 0 || | |
393 | nops == 0) { | |
394 | /* TODO: Support const_value */ | |
395 | pr_err("Failed to find the location of %s at this address.\n" | |
396 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
397 | return -ENOENT; | |
398 | } | |
399 | ||
400 | if (op->atom == DW_OP_addr) { | |
401 | /* Static variables on memory (not stack), make @varname */ | |
402 | ret = strlen(dwarf_diename(vr_die)); | |
403 | tvar->value = zalloc(ret + 2); | |
404 | if (tvar->value == NULL) | |
405 | return -ENOMEM; | |
406 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
407 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
408 | if (tvar->ref == NULL) | |
409 | return -ENOMEM; | |
410 | return 0; | |
411 | } | |
4ea42b18 | 412 | |
4ea42b18 | 413 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 414 | if (op->atom == DW_OP_fbreg) { |
b55a87ad MH |
415 | if (pf->fb_ops == NULL) { |
416 | pr_warning("The attribute of frame base is not " | |
417 | "supported.\n"); | |
418 | return -ENOTSUP; | |
419 | } | |
4235b045 | 420 | ref = true; |
804b3606 MH |
421 | offs = op->number; |
422 | op = &pf->fb_ops[0]; | |
423 | } | |
4ea42b18 | 424 | |
804b3606 MH |
425 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
426 | regn = op->atom - DW_OP_breg0; | |
427 | offs += op->number; | |
4235b045 | 428 | ref = true; |
804b3606 MH |
429 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
430 | regn = op->atom - DW_OP_reg0; | |
431 | } else if (op->atom == DW_OP_bregx) { | |
432 | regn = op->number; | |
433 | offs += op->number2; | |
4235b045 | 434 | ref = true; |
804b3606 MH |
435 | } else if (op->atom == DW_OP_regx) { |
436 | regn = op->number; | |
b55a87ad MH |
437 | } else { |
438 | pr_warning("DW_OP %x is not supported.\n", op->atom); | |
439 | return -ENOTSUP; | |
440 | } | |
4ea42b18 MH |
441 | |
442 | regs = get_arch_regstr(regn); | |
b55a87ad | 443 | if (!regs) { |
cd932c59 | 444 | pr_warning("Mapping for DWARF register number %u missing on this architecture.", regn); |
b55a87ad MH |
445 | return -ERANGE; |
446 | } | |
4ea42b18 | 447 | |
02b95dad MH |
448 | tvar->value = strdup(regs); |
449 | if (tvar->value == NULL) | |
450 | return -ENOMEM; | |
451 | ||
4235b045 | 452 | if (ref) { |
b7dcb857 | 453 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
454 | if (tvar->ref == NULL) |
455 | return -ENOMEM; | |
4235b045 | 456 | } |
b55a87ad | 457 | return 0; |
4ea42b18 MH |
458 | } |
459 | ||
b55a87ad | 460 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 461 | struct probe_trace_arg *tvar, |
73317b95 | 462 | const char *cast) |
4984912e | 463 | { |
0e60836b | 464 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
465 | Dwarf_Die type; |
466 | char buf[16]; | |
467 | int ret; | |
468 | ||
73317b95 MH |
469 | /* TODO: check all types */ |
470 | if (cast && strcmp(cast, "string") != 0) { | |
471 | /* Non string type is OK */ | |
472 | tvar->type = strdup(cast); | |
473 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
474 | } | |
475 | ||
b55a87ad MH |
476 | if (die_get_real_type(vr_die, &type) == NULL) { |
477 | pr_warning("Failed to get a type information of %s.\n", | |
478 | dwarf_diename(vr_die)); | |
479 | return -ENOENT; | |
480 | } | |
4984912e | 481 | |
b2a3c12b MH |
482 | pr_debug("%s type is %s.\n", |
483 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
484 | ||
73317b95 MH |
485 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
486 | ret = dwarf_tag(&type); | |
487 | if (ret != DW_TAG_pointer_type && | |
488 | ret != DW_TAG_array_type) { | |
489 | pr_warning("Failed to cast into string: " | |
490 | "%s(%s) is not a pointer nor array.", | |
491 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
492 | return -EINVAL; | |
493 | } | |
494 | if (ret == DW_TAG_pointer_type) { | |
495 | if (die_get_real_type(&type, &type) == NULL) { | |
496 | pr_warning("Failed to get a type information."); | |
497 | return -ENOENT; | |
498 | } | |
499 | while (*ref_ptr) | |
500 | ref_ptr = &(*ref_ptr)->next; | |
501 | /* Add new reference with offset +0 */ | |
0e60836b | 502 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
503 | if (*ref_ptr == NULL) { |
504 | pr_warning("Out of memory error\n"); | |
505 | return -ENOMEM; | |
506 | } | |
507 | } | |
82175633 MH |
508 | if (!die_compare_name(&type, "char") && |
509 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 MH |
510 | pr_warning("Failed to cast into string: " |
511 | "%s is not (unsigned) char *.", | |
512 | dwarf_diename(vr_die)); | |
513 | return -EINVAL; | |
514 | } | |
515 | tvar->type = strdup(cast); | |
516 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
517 | } | |
518 | ||
4984912e MH |
519 | ret = die_get_byte_size(&type) * 8; |
520 | if (ret) { | |
521 | /* Check the bitwidth */ | |
522 | if (ret > MAX_BASIC_TYPE_BITS) { | |
b55a87ad MH |
523 | pr_info("%s exceeds max-bitwidth." |
524 | " Cut down to %d bits.\n", | |
525 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
4984912e MH |
526 | ret = MAX_BASIC_TYPE_BITS; |
527 | } | |
528 | ||
529 | ret = snprintf(buf, 16, "%c%d", | |
530 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
b55a87ad MH |
531 | if (ret < 0 || ret >= 16) { |
532 | if (ret >= 16) | |
533 | ret = -E2BIG; | |
534 | pr_warning("Failed to convert variable type: %s\n", | |
535 | strerror(-ret)); | |
536 | return ret; | |
537 | } | |
73317b95 MH |
538 | tvar->type = strdup(buf); |
539 | if (tvar->type == NULL) | |
02b95dad | 540 | return -ENOMEM; |
4984912e | 541 | } |
b55a87ad | 542 | return 0; |
4984912e MH |
543 | } |
544 | ||
b55a87ad | 545 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 546 | struct perf_probe_arg_field *field, |
0e60836b | 547 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 548 | Dwarf_Die *die_mem) |
7df2f329 | 549 | { |
0e60836b | 550 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
551 | Dwarf_Die type; |
552 | Dwarf_Word offs; | |
b2a3c12b | 553 | int ret, tag; |
7df2f329 MH |
554 | |
555 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
556 | if (die_get_real_type(vr_die, &type) == NULL) { |
557 | pr_warning("Failed to get the type of %s.\n", varname); | |
558 | return -ENOENT; | |
559 | } | |
b2a3c12b MH |
560 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
561 | tag = dwarf_tag(&type); | |
562 | ||
563 | if (field->name[0] == '[' && | |
564 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
565 | if (field->next) | |
566 | /* Save original type for next field */ | |
567 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
568 | /* Get the type of this array */ | |
569 | if (die_get_real_type(&type, &type) == NULL) { | |
570 | pr_warning("Failed to get the type of %s.\n", varname); | |
571 | return -ENOENT; | |
572 | } | |
573 | pr_debug2("Array real type: (%x)\n", | |
574 | (unsigned)dwarf_dieoffset(&type)); | |
575 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 576 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
577 | if (ref == NULL) |
578 | return -ENOMEM; | |
579 | if (*ref_ptr) | |
580 | (*ref_ptr)->next = ref; | |
581 | else | |
582 | *ref_ptr = ref; | |
583 | } | |
584 | ref->offset += die_get_byte_size(&type) * field->index; | |
585 | if (!field->next) | |
586 | /* Save vr_die for converting types */ | |
587 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
588 | goto next; | |
589 | } else if (tag == DW_TAG_pointer_type) { | |
590 | /* Check the pointer and dereference */ | |
b55a87ad MH |
591 | if (!field->ref) { |
592 | pr_err("Semantic error: %s must be referred by '->'\n", | |
593 | field->name); | |
594 | return -EINVAL; | |
595 | } | |
7df2f329 | 596 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
597 | if (die_get_real_type(&type, &type) == NULL) { |
598 | pr_warning("Failed to get the type of %s.\n", varname); | |
599 | return -ENOENT; | |
600 | } | |
12e5a7ae | 601 | /* Verify it is a data structure */ |
b55a87ad MH |
602 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
603 | pr_warning("%s is not a data structure.\n", varname); | |
604 | return -EINVAL; | |
605 | } | |
12e5a7ae | 606 | |
0e60836b | 607 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
608 | if (ref == NULL) |
609 | return -ENOMEM; | |
7df2f329 MH |
610 | if (*ref_ptr) |
611 | (*ref_ptr)->next = ref; | |
612 | else | |
613 | *ref_ptr = ref; | |
614 | } else { | |
12e5a7ae | 615 | /* Verify it is a data structure */ |
b2a3c12b | 616 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
617 | pr_warning("%s is not a data structure.\n", varname); |
618 | return -EINVAL; | |
619 | } | |
b2a3c12b MH |
620 | if (field->name[0] == '[') { |
621 | pr_err("Semantic error: %s is not a pointor nor array.", | |
622 | varname); | |
623 | return -EINVAL; | |
624 | } | |
b55a87ad MH |
625 | if (field->ref) { |
626 | pr_err("Semantic error: %s must be referred by '.'\n", | |
627 | field->name); | |
628 | return -EINVAL; | |
629 | } | |
630 | if (!ref) { | |
631 | pr_warning("Structure on a register is not " | |
632 | "supported yet.\n"); | |
633 | return -ENOTSUP; | |
634 | } | |
7df2f329 MH |
635 | } |
636 | ||
b55a87ad MH |
637 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
638 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
639 | dwarf_diename(&type), field->name); | |
640 | return -EINVAL; | |
641 | } | |
7df2f329 MH |
642 | |
643 | /* Get the offset of the field */ | |
de1439d8 MH |
644 | ret = die_get_data_member_location(die_mem, &offs); |
645 | if (ret < 0) { | |
b55a87ad | 646 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 647 | return ret; |
b55a87ad | 648 | } |
7df2f329 MH |
649 | ref->offset += (long)offs; |
650 | ||
b2a3c12b | 651 | next: |
7df2f329 MH |
652 | /* Converting next field */ |
653 | if (field->next) | |
b55a87ad | 654 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 655 | field->next, &ref, die_mem); |
b55a87ad MH |
656 | else |
657 | return 0; | |
7df2f329 MH |
658 | } |
659 | ||
4ea42b18 | 660 | /* Show a variables in kprobe event format */ |
b55a87ad | 661 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 662 | { |
4984912e | 663 | Dwarf_Die die_mem; |
4ea42b18 MH |
664 | int ret; |
665 | ||
b7dcb857 MH |
666 | pr_debug("Converting variable %s into trace event.\n", |
667 | dwarf_diename(vr_die)); | |
804b3606 | 668 | |
b7dcb857 | 669 | ret = convert_variable_location(vr_die, pf); |
b55a87ad MH |
670 | if (ret == 0 && pf->pvar->field) { |
671 | ret = convert_variable_fields(vr_die, pf->pvar->var, | |
672 | pf->pvar->field, &pf->tvar->ref, | |
673 | &die_mem); | |
4984912e MH |
674 | vr_die = &die_mem; |
675 | } | |
73317b95 MH |
676 | if (ret == 0) |
677 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 678 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 679 | return ret; |
4ea42b18 MH |
680 | } |
681 | ||
4ea42b18 | 682 | /* Find a variable in a subprogram die */ |
b55a87ad | 683 | static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 684 | { |
b7dcb857 | 685 | Dwarf_Die vr_die, *scopes; |
11a1ca35 | 686 | char buf[32], *ptr; |
b7dcb857 | 687 | int ret, nscopes; |
4ea42b18 | 688 | |
367e94c1 MH |
689 | if (!is_c_varname(pf->pvar->var)) { |
690 | /* Copy raw parameters */ | |
691 | pf->tvar->value = strdup(pf->pvar->var); | |
692 | if (pf->tvar->value == NULL) | |
693 | return -ENOMEM; | |
694 | if (pf->pvar->type) { | |
695 | pf->tvar->type = strdup(pf->pvar->type); | |
696 | if (pf->tvar->type == NULL) | |
697 | return -ENOMEM; | |
698 | } | |
699 | if (pf->pvar->name) { | |
700 | pf->tvar->name = strdup(pf->pvar->name); | |
701 | if (pf->tvar->name == NULL) | |
702 | return -ENOMEM; | |
703 | } else | |
704 | pf->tvar->name = NULL; | |
705 | return 0; | |
706 | } | |
707 | ||
48481938 | 708 | if (pf->pvar->name) |
02b95dad | 709 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 710 | else { |
02b95dad MH |
711 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
712 | if (ret < 0) | |
713 | return ret; | |
11a1ca35 MH |
714 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
715 | if (ptr) | |
716 | *ptr = '_'; | |
02b95dad | 717 | pf->tvar->name = strdup(buf); |
48481938 | 718 | } |
02b95dad MH |
719 | if (pf->tvar->name == NULL) |
720 | return -ENOMEM; | |
48481938 | 721 | |
b55a87ad MH |
722 | pr_debug("Searching '%s' variable in context.\n", |
723 | pf->pvar->var); | |
724 | /* Search child die for local variables and parameters. */ | |
b7dcb857 MH |
725 | if (die_find_variable(sp_die, pf->pvar->var, &vr_die)) |
726 | ret = convert_variable(&vr_die, pf); | |
727 | else { | |
728 | /* Search upper class */ | |
729 | nscopes = dwarf_getscopes_die(sp_die, &scopes); | |
730 | if (nscopes > 0) { | |
731 | ret = dwarf_getscopevar(scopes, nscopes, pf->pvar->var, | |
732 | 0, NULL, 0, 0, &vr_die); | |
733 | if (ret >= 0) | |
734 | ret = convert_variable(&vr_die, pf); | |
735 | else | |
736 | ret = -ENOENT; | |
737 | free(scopes); | |
738 | } else | |
739 | ret = -ENOENT; | |
740 | } | |
741 | if (ret < 0) | |
b55a87ad MH |
742 | pr_warning("Failed to find '%s' in this function.\n", |
743 | pf->pvar->var); | |
b7dcb857 | 744 | return ret; |
4ea42b18 MH |
745 | } |
746 | ||
4ea42b18 | 747 | /* Show a probe point to output buffer */ |
b55a87ad | 748 | static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf) |
4ea42b18 | 749 | { |
0e60836b | 750 | struct probe_trace_event *tev; |
e92b85e1 MH |
751 | Dwarf_Addr eaddr; |
752 | Dwarf_Die die_mem; | |
804b3606 | 753 | const char *name; |
4235b045 | 754 | int ret, i; |
804b3606 MH |
755 | Dwarf_Attribute fb_attr; |
756 | size_t nops; | |
4ea42b18 | 757 | |
ef4a3565 MH |
758 | if (pf->ntevs == pf->max_tevs) { |
759 | pr_warning("Too many( > %d) probe point found.\n", | |
760 | pf->max_tevs); | |
b55a87ad MH |
761 | return -ERANGE; |
762 | } | |
4235b045 MH |
763 | tev = &pf->tevs[pf->ntevs++]; |
764 | ||
e92b85e1 MH |
765 | /* If no real subprogram, find a real one */ |
766 | if (!sp_die || dwarf_tag(sp_die) != DW_TAG_subprogram) { | |
95a3e4c4 | 767 | sp_die = die_find_real_subprogram(&pf->cu_die, |
e92b85e1 | 768 | pf->addr, &die_mem); |
b55a87ad MH |
769 | if (!sp_die) { |
770 | pr_warning("Failed to find probe point in any " | |
771 | "functions.\n"); | |
772 | return -ENOENT; | |
773 | } | |
e92b85e1 MH |
774 | } |
775 | ||
4235b045 | 776 | /* Copy the name of probe point */ |
804b3606 MH |
777 | name = dwarf_diename(sp_die); |
778 | if (name) { | |
b55a87ad MH |
779 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
780 | pr_warning("Failed to get entry pc of %s\n", | |
781 | dwarf_diename(sp_die)); | |
782 | return -ENOENT; | |
783 | } | |
02b95dad MH |
784 | tev->point.symbol = strdup(name); |
785 | if (tev->point.symbol == NULL) | |
786 | return -ENOMEM; | |
4235b045 MH |
787 | tev->point.offset = (unsigned long)(pf->addr - eaddr); |
788 | } else | |
4ea42b18 | 789 | /* This function has no name. */ |
4235b045 MH |
790 | tev->point.offset = (unsigned long)pf->addr; |
791 | ||
04ddd04b MH |
792 | /* Return probe must be on the head of a subprogram */ |
793 | if (pf->pev->point.retprobe) { | |
794 | if (tev->point.offset != 0) { | |
795 | pr_warning("Return probe must be on the head of" | |
796 | " a real function\n"); | |
797 | return -EINVAL; | |
798 | } | |
799 | tev->point.retprobe = true; | |
800 | } | |
801 | ||
4235b045 MH |
802 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
803 | tev->point.offset); | |
4ea42b18 | 804 | |
804b3606 MH |
805 | /* Get the frame base attribute/ops */ |
806 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 807 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 808 | if (ret <= 0 || nops == 0) { |
804b3606 | 809 | pf->fb_ops = NULL; |
7752f1b0 | 810 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
811 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
812 | pf->cfi != NULL) { | |
813 | Dwarf_Frame *frame; | |
b55a87ad MH |
814 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
815 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
816 | pr_warning("Failed to get CFA on 0x%jx\n", | |
817 | (uintmax_t)pf->addr); | |
818 | return -ENOENT; | |
819 | } | |
7752f1b0 | 820 | #endif |
a34a9854 | 821 | } |
804b3606 | 822 | |
4ea42b18 | 823 | /* Find each argument */ |
4235b045 | 824 | tev->nargs = pf->pev->nargs; |
0e60836b | 825 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
e334016f MH |
826 | if (tev->args == NULL) |
827 | return -ENOMEM; | |
4235b045 MH |
828 | for (i = 0; i < pf->pev->nargs; i++) { |
829 | pf->pvar = &pf->pev->args[i]; | |
830 | pf->tvar = &tev->args[i]; | |
b55a87ad MH |
831 | ret = find_variable(sp_die, pf); |
832 | if (ret != 0) | |
833 | return ret; | |
4ea42b18 | 834 | } |
804b3606 MH |
835 | |
836 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
837 | pf->fb_ops = NULL; | |
b55a87ad | 838 | return 0; |
4ea42b18 MH |
839 | } |
840 | ||
4ea42b18 | 841 | /* Find probe point from its line number */ |
b55a87ad | 842 | static int find_probe_point_by_line(struct probe_finder *pf) |
4ea42b18 | 843 | { |
804b3606 MH |
844 | Dwarf_Lines *lines; |
845 | Dwarf_Line *line; | |
846 | size_t nlines, i; | |
e92b85e1 | 847 | Dwarf_Addr addr; |
804b3606 | 848 | int lineno; |
b55a87ad | 849 | int ret = 0; |
4ea42b18 | 850 | |
b55a87ad MH |
851 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
852 | pr_warning("No source lines found in this CU.\n"); | |
853 | return -ENOENT; | |
854 | } | |
4ea42b18 | 855 | |
b55a87ad | 856 | for (i = 0; i < nlines && ret == 0; i++) { |
804b3606 | 857 | line = dwarf_onesrcline(lines, i); |
b55a87ad MH |
858 | if (dwarf_lineno(line, &lineno) != 0 || |
859 | lineno != pf->lno) | |
4ea42b18 MH |
860 | continue; |
861 | ||
804b3606 MH |
862 | /* TODO: Get fileno from line, but how? */ |
863 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
864 | continue; | |
b0ef0732 | 865 | |
b55a87ad MH |
866 | if (dwarf_lineaddr(line, &addr) != 0) { |
867 | pr_warning("Failed to get the address of the line.\n"); | |
868 | return -ENOENT; | |
869 | } | |
804b3606 MH |
870 | pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n", |
871 | (int)i, lineno, (uintmax_t)addr); | |
4ea42b18 | 872 | pf->addr = addr; |
804b3606 | 873 | |
b55a87ad | 874 | ret = convert_probe_point(NULL, pf); |
4ea42b18 MH |
875 | /* Continuing, because target line might be inlined. */ |
876 | } | |
b55a87ad | 877 | return ret; |
4ea42b18 MH |
878 | } |
879 | ||
2a9c8c36 MH |
880 | /* Find lines which match lazy pattern */ |
881 | static int find_lazy_match_lines(struct list_head *head, | |
882 | const char *fname, const char *pat) | |
883 | { | |
884 | char *fbuf, *p1, *p2; | |
b448c4b6 | 885 | int fd, line, nlines = -1; |
2a9c8c36 MH |
886 | struct stat st; |
887 | ||
888 | fd = open(fname, O_RDONLY); | |
b55a87ad MH |
889 | if (fd < 0) { |
890 | pr_warning("Failed to open %s: %s\n", fname, strerror(-fd)); | |
b448c4b6 | 891 | return -errno; |
b55a87ad MH |
892 | } |
893 | ||
b448c4b6 | 894 | if (fstat(fd, &st) < 0) { |
b55a87ad MH |
895 | pr_warning("Failed to get the size of %s: %s\n", |
896 | fname, strerror(errno)); | |
b448c4b6 ACM |
897 | nlines = -errno; |
898 | goto out_close; | |
b55a87ad | 899 | } |
b448c4b6 ACM |
900 | |
901 | nlines = -ENOMEM; | |
902 | fbuf = malloc(st.st_size + 2); | |
903 | if (fbuf == NULL) | |
904 | goto out_close; | |
905 | if (read(fd, fbuf, st.st_size) < 0) { | |
b55a87ad | 906 | pr_warning("Failed to read %s: %s\n", fname, strerror(errno)); |
b448c4b6 ACM |
907 | nlines = -errno; |
908 | goto out_free_fbuf; | |
b55a87ad | 909 | } |
2a9c8c36 MH |
910 | fbuf[st.st_size] = '\n'; /* Dummy line */ |
911 | fbuf[st.st_size + 1] = '\0'; | |
912 | p1 = fbuf; | |
913 | line = 1; | |
b448c4b6 | 914 | nlines = 0; |
2a9c8c36 MH |
915 | while ((p2 = strchr(p1, '\n')) != NULL) { |
916 | *p2 = '\0'; | |
917 | if (strlazymatch(p1, pat)) { | |
918 | line_list__add_line(head, line); | |
919 | nlines++; | |
920 | } | |
921 | line++; | |
922 | p1 = p2 + 1; | |
923 | } | |
b448c4b6 | 924 | out_free_fbuf: |
2a9c8c36 | 925 | free(fbuf); |
b448c4b6 ACM |
926 | out_close: |
927 | close(fd); | |
2a9c8c36 MH |
928 | return nlines; |
929 | } | |
930 | ||
931 | /* Find probe points from lazy pattern */ | |
b55a87ad | 932 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 MH |
933 | { |
934 | Dwarf_Lines *lines; | |
935 | Dwarf_Line *line; | |
936 | size_t nlines, i; | |
937 | Dwarf_Addr addr; | |
938 | Dwarf_Die die_mem; | |
939 | int lineno; | |
b55a87ad | 940 | int ret = 0; |
2a9c8c36 MH |
941 | |
942 | if (list_empty(&pf->lcache)) { | |
943 | /* Matching lazy line pattern */ | |
944 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 945 | pf->pev->point.lazy_line); |
b55a87ad MH |
946 | if (ret == 0) { |
947 | pr_debug("No matched lines found in %s.\n", pf->fname); | |
948 | return 0; | |
949 | } else if (ret < 0) | |
950 | return ret; | |
2a9c8c36 MH |
951 | } |
952 | ||
b55a87ad MH |
953 | if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) { |
954 | pr_warning("No source lines found in this CU.\n"); | |
955 | return -ENOENT; | |
956 | } | |
957 | ||
958 | for (i = 0; i < nlines && ret >= 0; i++) { | |
2a9c8c36 MH |
959 | line = dwarf_onesrcline(lines, i); |
960 | ||
b55a87ad MH |
961 | if (dwarf_lineno(line, &lineno) != 0 || |
962 | !line_list__has_line(&pf->lcache, lineno)) | |
2a9c8c36 MH |
963 | continue; |
964 | ||
965 | /* TODO: Get fileno from line, but how? */ | |
966 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) | |
967 | continue; | |
968 | ||
b55a87ad MH |
969 | if (dwarf_lineaddr(line, &addr) != 0) { |
970 | pr_debug("Failed to get the address of line %d.\n", | |
971 | lineno); | |
972 | continue; | |
973 | } | |
2a9c8c36 MH |
974 | if (sp_die) { |
975 | /* Address filtering 1: does sp_die include addr? */ | |
976 | if (!dwarf_haspc(sp_die, addr)) | |
977 | continue; | |
978 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 979 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
2a9c8c36 MH |
980 | continue; |
981 | } | |
982 | ||
983 | pr_debug("Probe line found: line[%d]:%d addr:0x%llx\n", | |
984 | (int)i, lineno, (unsigned long long)addr); | |
985 | pf->addr = addr; | |
986 | ||
b55a87ad | 987 | ret = convert_probe_point(sp_die, pf); |
2a9c8c36 MH |
988 | /* Continuing, because target line might be inlined. */ |
989 | } | |
990 | /* TODO: deallocate lines, but how? */ | |
b55a87ad | 991 | return ret; |
2a9c8c36 MH |
992 | } |
993 | ||
b55a87ad MH |
994 | /* Callback parameter with return value */ |
995 | struct dwarf_callback_param { | |
996 | void *data; | |
997 | int retval; | |
998 | }; | |
999 | ||
e92b85e1 MH |
1000 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1001 | { | |
b55a87ad MH |
1002 | struct dwarf_callback_param *param = data; |
1003 | struct probe_finder *pf = param->data; | |
4235b045 | 1004 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1005 | Dwarf_Addr addr; |
e92b85e1 | 1006 | |
2a9c8c36 | 1007 | if (pp->lazy_line) |
b55a87ad | 1008 | param->retval = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1009 | else { |
1010 | /* Get probe address */ | |
b55a87ad MH |
1011 | if (dwarf_entrypc(in_die, &addr) != 0) { |
1012 | pr_warning("Failed to get entry pc of %s.\n", | |
1013 | dwarf_diename(in_die)); | |
1014 | param->retval = -ENOENT; | |
1015 | return DWARF_CB_ABORT; | |
1016 | } | |
1017 | pf->addr = addr; | |
2a9c8c36 MH |
1018 | pf->addr += pp->offset; |
1019 | pr_debug("found inline addr: 0x%jx\n", | |
1020 | (uintmax_t)pf->addr); | |
1021 | ||
b55a87ad | 1022 | param->retval = convert_probe_point(in_die, pf); |
5d1ee041 MH |
1023 | if (param->retval < 0) |
1024 | return DWARF_CB_ABORT; | |
2a9c8c36 | 1025 | } |
e92b85e1 | 1026 | |
e92b85e1 MH |
1027 | return DWARF_CB_OK; |
1028 | } | |
804b3606 | 1029 | |
4ea42b18 | 1030 | /* Search function from function name */ |
e92b85e1 | 1031 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1032 | { |
b55a87ad MH |
1033 | struct dwarf_callback_param *param = data; |
1034 | struct probe_finder *pf = param->data; | |
4235b045 | 1035 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1036 | |
e92b85e1 MH |
1037 | /* Check tag and diename */ |
1038 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
82175633 | 1039 | !die_compare_name(sp_die, pp->function)) |
b55a87ad | 1040 | return DWARF_CB_OK; |
e92b85e1 | 1041 | |
2a9c8c36 | 1042 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1043 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1044 | dwarf_decl_line(sp_die, &pf->lno); |
1045 | pf->lno += pp->line; | |
b55a87ad | 1046 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
1047 | } else if (!dwarf_func_inline(sp_die)) { |
1048 | /* Real function */ | |
2a9c8c36 | 1049 | if (pp->lazy_line) |
b55a87ad | 1050 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1051 | else { |
b55a87ad MH |
1052 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
1053 | pr_warning("Failed to get entry pc of %s.\n", | |
1054 | dwarf_diename(sp_die)); | |
1055 | param->retval = -ENOENT; | |
1056 | return DWARF_CB_ABORT; | |
1057 | } | |
2a9c8c36 MH |
1058 | pf->addr += pp->offset; |
1059 | /* TODO: Check the address in this function */ | |
b55a87ad | 1060 | param->retval = convert_probe_point(sp_die, pf); |
2a9c8c36 | 1061 | } |
b55a87ad MH |
1062 | } else { |
1063 | struct dwarf_callback_param _param = {.data = (void *)pf, | |
1064 | .retval = 0}; | |
e92b85e1 | 1065 | /* Inlined function: search instances */ |
b55a87ad MH |
1066 | dwarf_func_inline_instances(sp_die, probe_point_inline_cb, |
1067 | &_param); | |
1068 | param->retval = _param.retval; | |
1069 | } | |
e92b85e1 | 1070 | |
b55a87ad | 1071 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1072 | } |
1073 | ||
b55a87ad | 1074 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1075 | { |
b55a87ad MH |
1076 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1077 | .retval = 0}; | |
1078 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1079 | return _param.retval; | |
4ea42b18 MH |
1080 | } |
1081 | ||
0e60836b SD |
1082 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ |
1083 | int find_probe_trace_events(int fd, struct perf_probe_event *pev, | |
1084 | struct probe_trace_event **tevs, int max_tevs) | |
4ea42b18 | 1085 | { |
ef4a3565 | 1086 | struct probe_finder pf = {.pev = pev, .max_tevs = max_tevs}; |
4235b045 | 1087 | struct perf_probe_point *pp = &pev->point; |
804b3606 MH |
1088 | Dwarf_Off off, noff; |
1089 | size_t cuhl; | |
1090 | Dwarf_Die *diep; | |
1091 | Dwarf *dbg; | |
b55a87ad | 1092 | int ret = 0; |
804b3606 | 1093 | |
0e60836b | 1094 | pf.tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); |
e334016f MH |
1095 | if (pf.tevs == NULL) |
1096 | return -ENOMEM; | |
4235b045 MH |
1097 | *tevs = pf.tevs; |
1098 | pf.ntevs = 0; | |
1099 | ||
804b3606 | 1100 | dbg = dwarf_begin(fd, DWARF_C_READ); |
b55a87ad MH |
1101 | if (!dbg) { |
1102 | pr_warning("No dwarf info found in the vmlinux - " | |
1103 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
b448c4b6 ACM |
1104 | free(pf.tevs); |
1105 | *tevs = NULL; | |
b55a87ad MH |
1106 | return -EBADF; |
1107 | } | |
4ea42b18 | 1108 | |
7752f1b0 | 1109 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
1110 | /* Get the call frame information from this dwarf */ |
1111 | pf.cfi = dwarf_getcfi(dbg); | |
7752f1b0 | 1112 | #endif |
a34a9854 | 1113 | |
804b3606 | 1114 | off = 0; |
2a9c8c36 | 1115 | line_list__init(&pf.lcache); |
804b3606 | 1116 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1117 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) && |
1118 | ret >= 0) { | |
4ea42b18 | 1119 | /* Get the DIE(Debugging Information Entry) of this CU */ |
804b3606 MH |
1120 | diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die); |
1121 | if (!diep) | |
1122 | continue; | |
4ea42b18 MH |
1123 | |
1124 | /* Check if target file is included. */ | |
1125 | if (pp->file) | |
2a9c8c36 | 1126 | pf.fname = cu_find_realpath(&pf.cu_die, pp->file); |
804b3606 | 1127 | else |
2a9c8c36 | 1128 | pf.fname = NULL; |
4ea42b18 | 1129 | |
2a9c8c36 | 1130 | if (!pp->file || pf.fname) { |
4ea42b18 | 1131 | if (pp->function) |
b55a87ad | 1132 | ret = find_probe_point_by_func(&pf); |
2a9c8c36 | 1133 | else if (pp->lazy_line) |
b55a87ad | 1134 | ret = find_probe_point_lazy(NULL, &pf); |
b0ef0732 MH |
1135 | else { |
1136 | pf.lno = pp->line; | |
b55a87ad | 1137 | ret = find_probe_point_by_line(&pf); |
b0ef0732 | 1138 | } |
4ea42b18 | 1139 | } |
804b3606 | 1140 | off = noff; |
4ea42b18 | 1141 | } |
2a9c8c36 | 1142 | line_list__free(&pf.lcache); |
804b3606 | 1143 | dwarf_end(dbg); |
4ea42b18 | 1144 | |
b55a87ad | 1145 | return (ret < 0) ? ret : pf.ntevs; |
4ea42b18 MH |
1146 | } |
1147 | ||
fb1587d8 MH |
1148 | /* Reverse search */ |
1149 | int find_perf_probe_point(int fd, unsigned long addr, | |
1150 | struct perf_probe_point *ppt) | |
1151 | { | |
1152 | Dwarf_Die cudie, spdie, indie; | |
1153 | Dwarf *dbg; | |
1154 | Dwarf_Line *line; | |
1155 | Dwarf_Addr laddr, eaddr; | |
1156 | const char *tmp; | |
1157 | int lineno, ret = 0; | |
b55a87ad | 1158 | bool found = false; |
fb1587d8 MH |
1159 | |
1160 | dbg = dwarf_begin(fd, DWARF_C_READ); | |
1161 | if (!dbg) | |
b55a87ad | 1162 | return -EBADF; |
fb1587d8 MH |
1163 | |
1164 | /* Find cu die */ | |
75ec5a24 MH |
1165 | if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr, &cudie)) { |
1166 | ret = -EINVAL; | |
1167 | goto end; | |
1168 | } | |
fb1587d8 MH |
1169 | |
1170 | /* Find a corresponding line */ | |
1171 | line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr); | |
1172 | if (line) { | |
b55a87ad MH |
1173 | if (dwarf_lineaddr(line, &laddr) == 0 && |
1174 | (Dwarf_Addr)addr == laddr && | |
1175 | dwarf_lineno(line, &lineno) == 0) { | |
fb1587d8 | 1176 | tmp = dwarf_linesrc(line, NULL, NULL); |
b55a87ad MH |
1177 | if (tmp) { |
1178 | ppt->line = lineno; | |
02b95dad MH |
1179 | ppt->file = strdup(tmp); |
1180 | if (ppt->file == NULL) { | |
1181 | ret = -ENOMEM; | |
1182 | goto end; | |
1183 | } | |
b55a87ad MH |
1184 | found = true; |
1185 | } | |
fb1587d8 MH |
1186 | } |
1187 | } | |
1188 | ||
1189 | /* Find a corresponding function */ | |
1190 | if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) { | |
1191 | tmp = dwarf_diename(&spdie); | |
b55a87ad | 1192 | if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0) |
fb1587d8 MH |
1193 | goto end; |
1194 | ||
b55a87ad MH |
1195 | if (ppt->line) { |
1196 | if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1197 | &indie)) { | |
1198 | /* addr in an inline function */ | |
1199 | tmp = dwarf_diename(&indie); | |
1200 | if (!tmp) | |
1201 | goto end; | |
1202 | ret = dwarf_decl_line(&indie, &lineno); | |
1203 | } else { | |
1204 | if (eaddr == addr) { /* Function entry */ | |
1205 | lineno = ppt->line; | |
1206 | ret = 0; | |
1207 | } else | |
1208 | ret = dwarf_decl_line(&spdie, &lineno); | |
1209 | } | |
1210 | if (ret == 0) { | |
1211 | /* Make a relative line number */ | |
1212 | ppt->line -= lineno; | |
1213 | goto found; | |
1214 | } | |
fb1587d8 | 1215 | } |
b55a87ad MH |
1216 | /* We don't have a line number, let's use offset */ |
1217 | ppt->offset = addr - (unsigned long)eaddr; | |
1218 | found: | |
02b95dad MH |
1219 | ppt->function = strdup(tmp); |
1220 | if (ppt->function == NULL) { | |
1221 | ret = -ENOMEM; | |
1222 | goto end; | |
1223 | } | |
b55a87ad | 1224 | found = true; |
fb1587d8 MH |
1225 | } |
1226 | ||
1227 | end: | |
1228 | dwarf_end(dbg); | |
b55a87ad MH |
1229 | if (ret >= 0) |
1230 | ret = found ? 1 : 0; | |
fb1587d8 MH |
1231 | return ret; |
1232 | } | |
1233 | ||
f6c903f5 MH |
1234 | /* Add a line and store the src path */ |
1235 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1236 | struct line_range *lr) | |
1237 | { | |
7cf0b79e | 1238 | /* Copy source path */ |
f6c903f5 | 1239 | if (!lr->path) { |
7cf0b79e MH |
1240 | lr->path = strdup(src); |
1241 | if (lr->path == NULL) | |
1242 | return -ENOMEM; | |
f6c903f5 MH |
1243 | } |
1244 | return line_list__add_line(&lr->line_list, lineno); | |
1245 | } | |
1246 | ||
1247 | /* Search function declaration lines */ | |
1248 | static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data) | |
1249 | { | |
1250 | struct dwarf_callback_param *param = data; | |
1251 | struct line_finder *lf = param->data; | |
1252 | const char *src; | |
1253 | int lineno; | |
1254 | ||
1255 | src = dwarf_decl_file(sp_die); | |
1256 | if (src && strtailcmp(src, lf->fname) != 0) | |
1257 | return DWARF_CB_OK; | |
1258 | ||
1259 | if (dwarf_decl_line(sp_die, &lineno) != 0 || | |
1260 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
1261 | return DWARF_CB_OK; | |
1262 | ||
1263 | param->retval = line_range_add_line(src, lineno, lf->lr); | |
5d1ee041 MH |
1264 | if (param->retval < 0) |
1265 | return DWARF_CB_ABORT; | |
f6c903f5 MH |
1266 | return DWARF_CB_OK; |
1267 | } | |
1268 | ||
1269 | static int find_line_range_func_decl_lines(struct line_finder *lf) | |
1270 | { | |
1271 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; | |
1272 | dwarf_getfuncs(&lf->cu_die, line_range_funcdecl_cb, ¶m, 0); | |
1273 | return param.retval; | |
1274 | } | |
fb1587d8 | 1275 | |
631c9def | 1276 | /* Find line range from its line number */ |
b55a87ad | 1277 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1278 | { |
804b3606 MH |
1279 | Dwarf_Lines *lines; |
1280 | Dwarf_Line *line; | |
1281 | size_t nlines, i; | |
631c9def | 1282 | Dwarf_Addr addr; |
f6c903f5 | 1283 | int lineno, ret = 0; |
804b3606 | 1284 | const char *src; |
161a26b0 | 1285 | Dwarf_Die die_mem; |
631c9def | 1286 | |
2a9c8c36 | 1287 | line_list__init(&lf->lr->line_list); |
b55a87ad MH |
1288 | if (dwarf_getsrclines(&lf->cu_die, &lines, &nlines) != 0) { |
1289 | pr_warning("No source lines found in this CU.\n"); | |
1290 | return -ENOENT; | |
1291 | } | |
631c9def | 1292 | |
f6c903f5 | 1293 | /* Search probable lines on lines list */ |
804b3606 MH |
1294 | for (i = 0; i < nlines; i++) { |
1295 | line = dwarf_onesrcline(lines, i); | |
b55a87ad MH |
1296 | if (dwarf_lineno(line, &lineno) != 0 || |
1297 | (lf->lno_s > lineno || lf->lno_e < lineno)) | |
631c9def MH |
1298 | continue; |
1299 | ||
161a26b0 MH |
1300 | if (sp_die) { |
1301 | /* Address filtering 1: does sp_die include addr? */ | |
b55a87ad MH |
1302 | if (dwarf_lineaddr(line, &addr) != 0 || |
1303 | !dwarf_haspc(sp_die, addr)) | |
161a26b0 MH |
1304 | continue; |
1305 | ||
1306 | /* Address filtering 2: No child include addr? */ | |
95a3e4c4 | 1307 | if (die_find_inlinefunc(sp_die, addr, &die_mem)) |
161a26b0 MH |
1308 | continue; |
1309 | } | |
1310 | ||
804b3606 MH |
1311 | /* TODO: Get fileno from line, but how? */ |
1312 | src = dwarf_linesrc(line, NULL, NULL); | |
1313 | if (strtailcmp(src, lf->fname) != 0) | |
631c9def MH |
1314 | continue; |
1315 | ||
f6c903f5 MH |
1316 | ret = line_range_add_line(src, lineno, lf->lr); |
1317 | if (ret < 0) | |
1318 | return ret; | |
631c9def | 1319 | } |
f6c903f5 MH |
1320 | |
1321 | /* | |
1322 | * Dwarf lines doesn't include function declarations. We have to | |
1323 | * check functions list or given function. | |
1324 | */ | |
1325 | if (sp_die) { | |
1326 | src = dwarf_decl_file(sp_die); | |
1327 | if (src && dwarf_decl_line(sp_die, &lineno) == 0 && | |
1328 | (lf->lno_s <= lineno && lf->lno_e >= lineno)) | |
1329 | ret = line_range_add_line(src, lineno, lf->lr); | |
1330 | } else | |
1331 | ret = find_line_range_func_decl_lines(lf); | |
1332 | ||
804b3606 | 1333 | /* Update status */ |
f6c903f5 MH |
1334 | if (ret >= 0) |
1335 | if (!list_empty(&lf->lr->line_list)) | |
1336 | ret = lf->found = 1; | |
1337 | else | |
1338 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1339 | else { |
1340 | free(lf->lr->path); | |
1341 | lf->lr->path = NULL; | |
1342 | } | |
f6c903f5 | 1343 | return ret; |
631c9def MH |
1344 | } |
1345 | ||
161a26b0 MH |
1346 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1347 | { | |
b55a87ad MH |
1348 | struct dwarf_callback_param *param = data; |
1349 | ||
1350 | param->retval = find_line_range_by_line(in_die, param->data); | |
161a26b0 MH |
1351 | return DWARF_CB_ABORT; /* No need to find other instances */ |
1352 | } | |
1353 | ||
631c9def | 1354 | /* Search function from function name */ |
e92b85e1 | 1355 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1356 | { |
b55a87ad MH |
1357 | struct dwarf_callback_param *param = data; |
1358 | struct line_finder *lf = param->data; | |
631c9def | 1359 | struct line_range *lr = lf->lr; |
631c9def | 1360 | |
e92b85e1 | 1361 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1362 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1363 | lf->fname = dwarf_decl_file(sp_die); |
1364 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1365 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1366 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1367 | if (lf->lno_s < 0) /* Overflow */ |
1368 | lf->lno_s = INT_MAX; | |
1369 | lf->lno_e = lr->offset + lr->end; | |
1370 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1371 | lf->lno_e = INT_MAX; |
d3b63d7a | 1372 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1373 | lr->start = lf->lno_s; |
1374 | lr->end = lf->lno_e; | |
b55a87ad MH |
1375 | if (dwarf_func_inline(sp_die)) { |
1376 | struct dwarf_callback_param _param; | |
1377 | _param.data = (void *)lf; | |
1378 | _param.retval = 0; | |
161a26b0 | 1379 | dwarf_func_inline_instances(sp_die, |
b55a87ad MH |
1380 | line_range_inline_cb, |
1381 | &_param); | |
1382 | param->retval = _param.retval; | |
1383 | } else | |
1384 | param->retval = find_line_range_by_line(sp_die, lf); | |
1385 | return DWARF_CB_ABORT; | |
631c9def | 1386 | } |
b55a87ad | 1387 | return DWARF_CB_OK; |
631c9def MH |
1388 | } |
1389 | ||
b55a87ad | 1390 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1391 | { |
b55a87ad MH |
1392 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1393 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1394 | return param.retval; | |
631c9def MH |
1395 | } |
1396 | ||
1397 | int find_line_range(int fd, struct line_range *lr) | |
1398 | { | |
804b3606 | 1399 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1400 | int ret = 0; |
804b3606 MH |
1401 | Dwarf_Off off = 0, noff; |
1402 | size_t cuhl; | |
1403 | Dwarf_Die *diep; | |
1404 | Dwarf *dbg; | |
6a330a3c | 1405 | const char *comp_dir; |
804b3606 MH |
1406 | |
1407 | dbg = dwarf_begin(fd, DWARF_C_READ); | |
b55a87ad MH |
1408 | if (!dbg) { |
1409 | pr_warning("No dwarf info found in the vmlinux - " | |
1410 | "please rebuild with CONFIG_DEBUG_INFO=y.\n"); | |
1411 | return -EBADF; | |
1412 | } | |
631c9def | 1413 | |
804b3606 | 1414 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad MH |
1415 | while (!lf.found && ret >= 0) { |
1416 | if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0) | |
631c9def MH |
1417 | break; |
1418 | ||
1419 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
804b3606 MH |
1420 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
1421 | if (!diep) | |
1422 | continue; | |
631c9def MH |
1423 | |
1424 | /* Check if target file is included. */ | |
1425 | if (lr->file) | |
2a9c8c36 | 1426 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1427 | else |
2a9c8c36 | 1428 | lf.fname = 0; |
631c9def | 1429 | |
2a9c8c36 | 1430 | if (!lr->file || lf.fname) { |
631c9def | 1431 | if (lr->function) |
b55a87ad | 1432 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1433 | else { |
1434 | lf.lno_s = lr->start; | |
d3b63d7a | 1435 | lf.lno_e = lr->end; |
b55a87ad | 1436 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1437 | } |
631c9def | 1438 | } |
804b3606 | 1439 | off = noff; |
631c9def | 1440 | } |
6a330a3c MH |
1441 | |
1442 | /* Store comp_dir */ | |
1443 | if (lf.found) { | |
1444 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1445 | if (comp_dir) { | |
1446 | lr->comp_dir = strdup(comp_dir); | |
1447 | if (!lr->comp_dir) | |
1448 | ret = -ENOMEM; | |
1449 | } | |
1450 | } | |
1451 | ||
7cf0b79e | 1452 | pr_debug("path: %s\n", lr->path); |
804b3606 | 1453 | dwarf_end(dbg); |
b55a87ad MH |
1454 | |
1455 | return (ret < 0) ? ret : lf.found; | |
631c9def MH |
1456 | } |
1457 |