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