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> | |
cd932c59 | 33 | #include <dwarf-regs.h> |
074fc0e4 | 34 | |
124bb83c | 35 | #include <linux/bitops.h> |
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 | ||
2a9c8c36 MH |
45 | /* Line number list operations */ |
46 | ||
47 | /* Add a line to line number list */ | |
d3b63d7a | 48 | static int line_list__add_line(struct list_head *head, int line) |
2a9c8c36 MH |
49 | { |
50 | struct line_node *ln; | |
51 | struct list_head *p; | |
52 | ||
53 | /* Reverse search, because new line will be the last one */ | |
54 | list_for_each_entry_reverse(ln, head, list) { | |
55 | if (ln->line < line) { | |
56 | p = &ln->list; | |
57 | goto found; | |
58 | } else if (ln->line == line) /* Already exist */ | |
e334016f | 59 | return 1; |
2a9c8c36 MH |
60 | } |
61 | /* List is empty, or the smallest entry */ | |
62 | p = head; | |
63 | found: | |
64 | pr_debug("line list: add a line %u\n", line); | |
e334016f MH |
65 | ln = zalloc(sizeof(struct line_node)); |
66 | if (ln == NULL) | |
67 | return -ENOMEM; | |
2a9c8c36 MH |
68 | ln->line = line; |
69 | INIT_LIST_HEAD(&ln->list); | |
70 | list_add(&ln->list, p); | |
e334016f | 71 | return 0; |
2a9c8c36 MH |
72 | } |
73 | ||
74 | /* Check if the line in line number list */ | |
d3b63d7a | 75 | static int line_list__has_line(struct list_head *head, int line) |
2a9c8c36 MH |
76 | { |
77 | struct line_node *ln; | |
78 | ||
79 | /* Reverse search, because new line will be the last one */ | |
80 | list_for_each_entry(ln, head, list) | |
81 | if (ln->line == line) | |
82 | return 1; | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | /* Init line number list */ | |
88 | static void line_list__init(struct list_head *head) | |
89 | { | |
90 | INIT_LIST_HEAD(head); | |
91 | } | |
92 | ||
93 | /* Free line number list */ | |
94 | static void line_list__free(struct list_head *head) | |
95 | { | |
96 | struct line_node *ln; | |
97 | while (!list_empty(head)) { | |
98 | ln = list_first_entry(head, struct line_node, list); | |
99 | list_del(&ln->list); | |
100 | free(ln); | |
101 | } | |
102 | } | |
103 | ||
469b9b88 | 104 | /* Dwarf FL wrappers */ |
469b9b88 MH |
105 | static char *debuginfo_path; /* Currently dummy */ |
106 | ||
107 | static const Dwfl_Callbacks offline_callbacks = { | |
108 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
109 | .debuginfo_path = &debuginfo_path, | |
110 | ||
111 | .section_address = dwfl_offline_section_address, | |
112 | ||
113 | /* We use this table for core files too. */ | |
114 | .find_elf = dwfl_build_id_find_elf, | |
115 | }; | |
116 | ||
469b9b88 | 117 | /* Get a Dwarf from offline image */ |
ff741783 MH |
118 | static int debuginfo__init_offline_dwarf(struct debuginfo *self, |
119 | const char *path) | |
469b9b88 MH |
120 | { |
121 | Dwfl_Module *mod; | |
ff741783 | 122 | int fd; |
469b9b88 | 123 | |
ff741783 MH |
124 | fd = open(path, O_RDONLY); |
125 | if (fd < 0) | |
126 | return fd; | |
469b9b88 | 127 | |
ff741783 MH |
128 | self->dwfl = dwfl_begin(&offline_callbacks); |
129 | if (!self->dwfl) | |
130 | goto error; | |
469b9b88 | 131 | |
ff741783 | 132 | mod = dwfl_report_offline(self->dwfl, "", "", fd); |
469b9b88 MH |
133 | if (!mod) |
134 | goto error; | |
135 | ||
ff741783 MH |
136 | self->dbg = dwfl_module_getdwarf(mod, &self->bias); |
137 | if (!self->dbg) | |
138 | goto error; | |
139 | ||
140 | return 0; | |
469b9b88 | 141 | error: |
ff741783 MH |
142 | if (self->dwfl) |
143 | dwfl_end(self->dwfl); | |
144 | else | |
145 | close(fd); | |
146 | memset(self, 0, sizeof(*self)); | |
147 | ||
148 | return -ENOENT; | |
469b9b88 MH |
149 | } |
150 | ||
3b4694de MH |
151 | #if _ELFUTILS_PREREQ(0, 148) |
152 | /* This method is buggy if elfutils is older than 0.148 */ | |
153 | static int __linux_kernel_find_elf(Dwfl_Module *mod, | |
154 | void **userdata, | |
155 | const char *module_name, | |
156 | Dwarf_Addr base, | |
157 | char **file_name, Elf **elfp) | |
158 | { | |
159 | int fd; | |
160 | const char *path = kernel_get_module_path(module_name); | |
161 | ||
162 | pr_debug2("Use file %s for %s\n", path, module_name); | |
163 | if (path) { | |
164 | fd = open(path, O_RDONLY); | |
165 | if (fd >= 0) { | |
166 | *file_name = strdup(path); | |
167 | return fd; | |
168 | } | |
169 | } | |
170 | /* If failed, try to call standard method */ | |
171 | return dwfl_linux_kernel_find_elf(mod, userdata, module_name, base, | |
172 | file_name, elfp); | |
173 | } | |
174 | ||
175 | static const Dwfl_Callbacks kernel_callbacks = { | |
176 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
177 | .debuginfo_path = &debuginfo_path, | |
178 | ||
179 | .find_elf = __linux_kernel_find_elf, | |
180 | .section_address = dwfl_linux_kernel_module_section_address, | |
181 | }; | |
182 | ||
469b9b88 | 183 | /* Get a Dwarf from live kernel image */ |
ff741783 MH |
184 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
185 | Dwarf_Addr addr) | |
469b9b88 | 186 | { |
ff741783 MH |
187 | self->dwfl = dwfl_begin(&kernel_callbacks); |
188 | if (!self->dwfl) | |
189 | return -EINVAL; | |
469b9b88 MH |
190 | |
191 | /* Load the kernel dwarves: Don't care the result here */ | |
ff741783 MH |
192 | dwfl_linux_kernel_report_kernel(self->dwfl); |
193 | dwfl_linux_kernel_report_modules(self->dwfl); | |
469b9b88 | 194 | |
ff741783 | 195 | self->dbg = dwfl_addrdwarf(self->dwfl, addr, &self->bias); |
469b9b88 | 196 | /* Here, check whether we could get a real dwarf */ |
ff741783 | 197 | if (!self->dbg) { |
3b4694de MH |
198 | pr_debug("Failed to find kernel dwarf at %lx\n", |
199 | (unsigned long)addr); | |
ff741783 MH |
200 | dwfl_end(self->dwfl); |
201 | memset(self, 0, sizeof(*self)); | |
202 | return -ENOENT; | |
469b9b88 | 203 | } |
ff741783 MH |
204 | |
205 | return 0; | |
469b9b88 | 206 | } |
3b4694de MH |
207 | #else |
208 | /* With older elfutils, this just support kernel module... */ | |
ff741783 | 209 | static int debuginfo__init_online_kernel_dwarf(struct debuginfo *self, |
1d037ca1 | 210 | Dwarf_Addr addr __maybe_unused) |
3b4694de | 211 | { |
3b4694de MH |
212 | const char *path = kernel_get_module_path("kernel"); |
213 | ||
214 | if (!path) { | |
215 | pr_err("Failed to find vmlinux path\n"); | |
ff741783 | 216 | return -ENOENT; |
3b4694de MH |
217 | } |
218 | ||
219 | pr_debug2("Use file %s for debuginfo\n", path); | |
ff741783 MH |
220 | return debuginfo__init_offline_dwarf(self, path); |
221 | } | |
222 | #endif | |
223 | ||
224 | struct debuginfo *debuginfo__new(const char *path) | |
225 | { | |
226 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
227 | if (!self) | |
3b4694de MH |
228 | return NULL; |
229 | ||
ff741783 MH |
230 | if (debuginfo__init_offline_dwarf(self, path) < 0) { |
231 | free(self); | |
232 | self = NULL; | |
233 | } | |
234 | ||
235 | return self; | |
236 | } | |
237 | ||
238 | struct debuginfo *debuginfo__new_online_kernel(unsigned long addr) | |
239 | { | |
240 | struct debuginfo *self = zalloc(sizeof(struct debuginfo)); | |
241 | if (!self) | |
242 | return NULL; | |
243 | ||
244 | if (debuginfo__init_online_kernel_dwarf(self, (Dwarf_Addr)addr) < 0) { | |
245 | free(self); | |
246 | self = NULL; | |
247 | } | |
248 | ||
249 | return self; | |
250 | } | |
251 | ||
252 | void debuginfo__delete(struct debuginfo *self) | |
253 | { | |
254 | if (self) { | |
255 | if (self->dwfl) | |
256 | dwfl_end(self->dwfl); | |
257 | free(self); | |
258 | } | |
3b4694de | 259 | } |
469b9b88 | 260 | |
4ea42b18 MH |
261 | /* |
262 | * Probe finder related functions | |
263 | */ | |
264 | ||
0e60836b | 265 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 266 | { |
0e60836b SD |
267 | struct probe_trace_arg_ref *ref; |
268 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
269 | if (ref != NULL) |
270 | ref->offset = offs; | |
271 | return ref; | |
272 | } | |
273 | ||
cf6eb489 MH |
274 | /* |
275 | * Convert a location into trace_arg. | |
276 | * If tvar == NULL, this just checks variable can be converted. | |
277 | */ | |
278 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
279 | Dwarf_Op *fb_ops, | |
280 | struct probe_trace_arg *tvar) | |
4ea42b18 | 281 | { |
b7dcb857 MH |
282 | Dwarf_Attribute attr; |
283 | Dwarf_Op *op; | |
284 | size_t nops; | |
804b3606 MH |
285 | unsigned int regn; |
286 | Dwarf_Word offs = 0; | |
4235b045 | 287 | bool ref = false; |
4ea42b18 | 288 | const char *regs; |
b7dcb857 MH |
289 | int ret; |
290 | ||
632941c4 MH |
291 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
292 | goto static_var; | |
293 | ||
b7dcb857 MH |
294 | /* TODO: handle more than 1 exprs */ |
295 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL || | |
cf6eb489 | 296 | dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0 || |
b7dcb857 MH |
297 | nops == 0) { |
298 | /* TODO: Support const_value */ | |
b7dcb857 MH |
299 | return -ENOENT; |
300 | } | |
301 | ||
302 | if (op->atom == DW_OP_addr) { | |
632941c4 | 303 | static_var: |
cf6eb489 MH |
304 | if (!tvar) |
305 | return 0; | |
b7dcb857 MH |
306 | /* Static variables on memory (not stack), make @varname */ |
307 | ret = strlen(dwarf_diename(vr_die)); | |
308 | tvar->value = zalloc(ret + 2); | |
309 | if (tvar->value == NULL) | |
310 | return -ENOMEM; | |
311 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
312 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
313 | if (tvar->ref == NULL) | |
314 | return -ENOMEM; | |
315 | return 0; | |
316 | } | |
4ea42b18 | 317 | |
4ea42b18 | 318 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 319 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 320 | if (fb_ops == NULL) |
b55a87ad | 321 | return -ENOTSUP; |
4235b045 | 322 | ref = true; |
804b3606 | 323 | offs = op->number; |
cf6eb489 | 324 | op = &fb_ops[0]; |
804b3606 | 325 | } |
4ea42b18 | 326 | |
804b3606 MH |
327 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
328 | regn = op->atom - DW_OP_breg0; | |
329 | offs += op->number; | |
4235b045 | 330 | ref = true; |
804b3606 MH |
331 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
332 | regn = op->atom - DW_OP_reg0; | |
333 | } else if (op->atom == DW_OP_bregx) { | |
334 | regn = op->number; | |
335 | offs += op->number2; | |
4235b045 | 336 | ref = true; |
804b3606 MH |
337 | } else if (op->atom == DW_OP_regx) { |
338 | regn = op->number; | |
b55a87ad | 339 | } else { |
cf6eb489 | 340 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
341 | return -ENOTSUP; |
342 | } | |
4ea42b18 | 343 | |
cf6eb489 MH |
344 | if (!tvar) |
345 | return 0; | |
346 | ||
4ea42b18 | 347 | regs = get_arch_regstr(regn); |
b55a87ad | 348 | if (!regs) { |
cf6eb489 | 349 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
350 | pr_warning("Mapping for the register number %u " |
351 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
352 | return -ERANGE; |
353 | } | |
4ea42b18 | 354 | |
02b95dad MH |
355 | tvar->value = strdup(regs); |
356 | if (tvar->value == NULL) | |
357 | return -ENOMEM; | |
358 | ||
4235b045 | 359 | if (ref) { |
b7dcb857 | 360 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
361 | if (tvar->ref == NULL) |
362 | return -ENOMEM; | |
4235b045 | 363 | } |
b55a87ad | 364 | return 0; |
4ea42b18 MH |
365 | } |
366 | ||
124bb83c MH |
367 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
368 | ||
b55a87ad | 369 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 370 | struct probe_trace_arg *tvar, |
73317b95 | 371 | const char *cast) |
4984912e | 372 | { |
0e60836b | 373 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
374 | Dwarf_Die type; |
375 | char buf[16]; | |
bcfc0821 | 376 | int bsize, boffs, total; |
4984912e MH |
377 | int ret; |
378 | ||
73317b95 MH |
379 | /* TODO: check all types */ |
380 | if (cast && strcmp(cast, "string") != 0) { | |
381 | /* Non string type is OK */ | |
382 | tvar->type = strdup(cast); | |
383 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
384 | } | |
385 | ||
bcfc0821 MH |
386 | bsize = dwarf_bitsize(vr_die); |
387 | if (bsize > 0) { | |
124bb83c | 388 | /* This is a bitfield */ |
bcfc0821 MH |
389 | boffs = dwarf_bitoffset(vr_die); |
390 | total = dwarf_bytesize(vr_die); | |
391 | if (boffs < 0 || total < 0) | |
392 | return -ENOENT; | |
393 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
394 | BYTES_TO_BITS(total)); | |
124bb83c MH |
395 | goto formatted; |
396 | } | |
397 | ||
b55a87ad MH |
398 | if (die_get_real_type(vr_die, &type) == NULL) { |
399 | pr_warning("Failed to get a type information of %s.\n", | |
400 | dwarf_diename(vr_die)); | |
401 | return -ENOENT; | |
402 | } | |
4984912e | 403 | |
b2a3c12b MH |
404 | pr_debug("%s type is %s.\n", |
405 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
406 | ||
73317b95 MH |
407 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
408 | ret = dwarf_tag(&type); | |
409 | if (ret != DW_TAG_pointer_type && | |
410 | ret != DW_TAG_array_type) { | |
411 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 412 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
413 | dwarf_diename(vr_die), dwarf_diename(&type)); |
414 | return -EINVAL; | |
415 | } | |
416 | if (ret == DW_TAG_pointer_type) { | |
417 | if (die_get_real_type(&type, &type) == NULL) { | |
0e43e5d2 MH |
418 | pr_warning("Failed to get a type" |
419 | " information.\n"); | |
73317b95 MH |
420 | return -ENOENT; |
421 | } | |
422 | while (*ref_ptr) | |
423 | ref_ptr = &(*ref_ptr)->next; | |
424 | /* Add new reference with offset +0 */ | |
0e60836b | 425 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
426 | if (*ref_ptr == NULL) { |
427 | pr_warning("Out of memory error\n"); | |
428 | return -ENOMEM; | |
429 | } | |
430 | } | |
82175633 MH |
431 | if (!die_compare_name(&type, "char") && |
432 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 433 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 434 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
435 | dwarf_diename(vr_die)); |
436 | return -EINVAL; | |
437 | } | |
438 | tvar->type = strdup(cast); | |
439 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
440 | } | |
441 | ||
bcfc0821 MH |
442 | ret = dwarf_bytesize(&type); |
443 | if (ret <= 0) | |
124bb83c MH |
444 | /* No size ... try to use default type */ |
445 | return 0; | |
bcfc0821 | 446 | ret = BYTES_TO_BITS(ret); |
4984912e | 447 | |
124bb83c MH |
448 | /* Check the bitwidth */ |
449 | if (ret > MAX_BASIC_TYPE_BITS) { | |
450 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
451 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
452 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 453 | } |
124bb83c MH |
454 | ret = snprintf(buf, 16, "%c%d", |
455 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
456 | ||
457 | formatted: | |
458 | if (ret < 0 || ret >= 16) { | |
459 | if (ret >= 16) | |
460 | ret = -E2BIG; | |
461 | pr_warning("Failed to convert variable type: %s\n", | |
462 | strerror(-ret)); | |
463 | return ret; | |
464 | } | |
465 | tvar->type = strdup(buf); | |
466 | if (tvar->type == NULL) | |
467 | return -ENOMEM; | |
b55a87ad | 468 | return 0; |
4984912e MH |
469 | } |
470 | ||
b55a87ad | 471 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 472 | struct perf_probe_arg_field *field, |
0e60836b | 473 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 474 | Dwarf_Die *die_mem) |
7df2f329 | 475 | { |
0e60836b | 476 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
477 | Dwarf_Die type; |
478 | Dwarf_Word offs; | |
b2a3c12b | 479 | int ret, tag; |
7df2f329 MH |
480 | |
481 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
482 | if (die_get_real_type(vr_die, &type) == NULL) { |
483 | pr_warning("Failed to get the type of %s.\n", varname); | |
484 | return -ENOENT; | |
485 | } | |
b2a3c12b MH |
486 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
487 | tag = dwarf_tag(&type); | |
488 | ||
489 | if (field->name[0] == '[' && | |
490 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
491 | if (field->next) | |
492 | /* Save original type for next field */ | |
493 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
494 | /* Get the type of this array */ | |
495 | if (die_get_real_type(&type, &type) == NULL) { | |
496 | pr_warning("Failed to get the type of %s.\n", varname); | |
497 | return -ENOENT; | |
498 | } | |
499 | pr_debug2("Array real type: (%x)\n", | |
500 | (unsigned)dwarf_dieoffset(&type)); | |
501 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 502 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
503 | if (ref == NULL) |
504 | return -ENOMEM; | |
505 | if (*ref_ptr) | |
506 | (*ref_ptr)->next = ref; | |
507 | else | |
508 | *ref_ptr = ref; | |
509 | } | |
bcfc0821 | 510 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
511 | if (!field->next) |
512 | /* Save vr_die for converting types */ | |
513 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
514 | goto next; | |
515 | } else if (tag == DW_TAG_pointer_type) { | |
516 | /* Check the pointer and dereference */ | |
b55a87ad MH |
517 | if (!field->ref) { |
518 | pr_err("Semantic error: %s must be referred by '->'\n", | |
519 | field->name); | |
520 | return -EINVAL; | |
521 | } | |
7df2f329 | 522 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
523 | if (die_get_real_type(&type, &type) == NULL) { |
524 | pr_warning("Failed to get the type of %s.\n", varname); | |
525 | return -ENOENT; | |
526 | } | |
12e5a7ae | 527 | /* Verify it is a data structure */ |
b55a87ad MH |
528 | if (dwarf_tag(&type) != DW_TAG_structure_type) { |
529 | pr_warning("%s is not a data structure.\n", varname); | |
530 | return -EINVAL; | |
531 | } | |
12e5a7ae | 532 | |
0e60836b | 533 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
534 | if (ref == NULL) |
535 | return -ENOMEM; | |
7df2f329 MH |
536 | if (*ref_ptr) |
537 | (*ref_ptr)->next = ref; | |
538 | else | |
539 | *ref_ptr = ref; | |
540 | } else { | |
12e5a7ae | 541 | /* Verify it is a data structure */ |
b2a3c12b | 542 | if (tag != DW_TAG_structure_type) { |
b55a87ad MH |
543 | pr_warning("%s is not a data structure.\n", varname); |
544 | return -EINVAL; | |
545 | } | |
b2a3c12b | 546 | if (field->name[0] == '[') { |
0e43e5d2 MH |
547 | pr_err("Semantic error: %s is not a pointor" |
548 | " nor array.\n", varname); | |
b2a3c12b MH |
549 | return -EINVAL; |
550 | } | |
b55a87ad MH |
551 | if (field->ref) { |
552 | pr_err("Semantic error: %s must be referred by '.'\n", | |
553 | field->name); | |
554 | return -EINVAL; | |
555 | } | |
556 | if (!ref) { | |
557 | pr_warning("Structure on a register is not " | |
558 | "supported yet.\n"); | |
559 | return -ENOTSUP; | |
560 | } | |
7df2f329 MH |
561 | } |
562 | ||
b55a87ad MH |
563 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
564 | pr_warning("%s(tyep:%s) has no member %s.\n", varname, | |
565 | dwarf_diename(&type), field->name); | |
566 | return -EINVAL; | |
567 | } | |
7df2f329 MH |
568 | |
569 | /* Get the offset of the field */ | |
de1439d8 MH |
570 | ret = die_get_data_member_location(die_mem, &offs); |
571 | if (ret < 0) { | |
b55a87ad | 572 | pr_warning("Failed to get the offset of %s.\n", field->name); |
de1439d8 | 573 | return ret; |
b55a87ad | 574 | } |
7df2f329 MH |
575 | ref->offset += (long)offs; |
576 | ||
b2a3c12b | 577 | next: |
7df2f329 MH |
578 | /* Converting next field */ |
579 | if (field->next) | |
b55a87ad | 580 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 581 | field->next, &ref, die_mem); |
b55a87ad MH |
582 | else |
583 | return 0; | |
7df2f329 MH |
584 | } |
585 | ||
4ea42b18 | 586 | /* Show a variables in kprobe event format */ |
b55a87ad | 587 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 588 | { |
4984912e | 589 | Dwarf_Die die_mem; |
4ea42b18 MH |
590 | int ret; |
591 | ||
b7dcb857 MH |
592 | pr_debug("Converting variable %s into trace event.\n", |
593 | dwarf_diename(vr_die)); | |
804b3606 | 594 | |
cf6eb489 MH |
595 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
596 | pf->tvar); | |
597 | if (ret == -ENOENT) | |
598 | pr_err("Failed to find the location of %s at this address.\n" | |
599 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
600 | else if (ret == -ENOTSUP) | |
601 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
602 | else if (pf->pvar->field) { | |
b55a87ad MH |
603 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
604 | pf->pvar->field, &pf->tvar->ref, | |
605 | &die_mem); | |
4984912e MH |
606 | vr_die = &die_mem; |
607 | } | |
73317b95 MH |
608 | if (ret == 0) |
609 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 610 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 611 | return ret; |
4ea42b18 MH |
612 | } |
613 | ||
221d0611 MH |
614 | /* Find a variable in a scope DIE */ |
615 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 616 | { |
f182e3e1 | 617 | Dwarf_Die vr_die; |
11a1ca35 | 618 | char buf[32], *ptr; |
f182e3e1 | 619 | int ret = 0; |
4ea42b18 | 620 | |
367e94c1 MH |
621 | if (!is_c_varname(pf->pvar->var)) { |
622 | /* Copy raw parameters */ | |
623 | pf->tvar->value = strdup(pf->pvar->var); | |
624 | if (pf->tvar->value == NULL) | |
625 | return -ENOMEM; | |
626 | if (pf->pvar->type) { | |
627 | pf->tvar->type = strdup(pf->pvar->type); | |
628 | if (pf->tvar->type == NULL) | |
629 | return -ENOMEM; | |
630 | } | |
631 | if (pf->pvar->name) { | |
632 | pf->tvar->name = strdup(pf->pvar->name); | |
633 | if (pf->tvar->name == NULL) | |
634 | return -ENOMEM; | |
635 | } else | |
636 | pf->tvar->name = NULL; | |
637 | return 0; | |
638 | } | |
639 | ||
48481938 | 640 | if (pf->pvar->name) |
02b95dad | 641 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 642 | else { |
02b95dad MH |
643 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
644 | if (ret < 0) | |
645 | return ret; | |
11a1ca35 MH |
646 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
647 | if (ptr) | |
648 | *ptr = '_'; | |
02b95dad | 649 | pf->tvar->name = strdup(buf); |
48481938 | 650 | } |
02b95dad MH |
651 | if (pf->tvar->name == NULL) |
652 | return -ENOMEM; | |
48481938 | 653 | |
f182e3e1 | 654 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 655 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
656 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
657 | /* Search again in global variables */ | |
658 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die)) | |
659 | ret = -ENOENT; | |
b7dcb857 | 660 | } |
f66fedcb | 661 | if (ret >= 0) |
f182e3e1 MH |
662 | ret = convert_variable(&vr_die, pf); |
663 | ||
b7dcb857 | 664 | if (ret < 0) |
b55a87ad MH |
665 | pr_warning("Failed to find '%s' in this function.\n", |
666 | pf->pvar->var); | |
b7dcb857 | 667 | return ret; |
4ea42b18 MH |
668 | } |
669 | ||
cf6eb489 MH |
670 | /* Convert subprogram DIE to trace point */ |
671 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr, | |
672 | bool retprobe, struct probe_trace_point *tp) | |
4ea42b18 | 673 | { |
26b79524 | 674 | Dwarf_Addr eaddr, highaddr; |
804b3606 | 675 | const char *name; |
e92b85e1 | 676 | |
4235b045 | 677 | /* Copy the name of probe point */ |
804b3606 MH |
678 | name = dwarf_diename(sp_die); |
679 | if (name) { | |
b55a87ad | 680 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
0e43e5d2 | 681 | pr_warning("Failed to get entry address of %s\n", |
b55a87ad MH |
682 | dwarf_diename(sp_die)); |
683 | return -ENOENT; | |
684 | } | |
26b79524 PN |
685 | if (dwarf_highpc(sp_die, &highaddr) != 0) { |
686 | pr_warning("Failed to get end address of %s\n", | |
687 | dwarf_diename(sp_die)); | |
688 | return -ENOENT; | |
689 | } | |
690 | if (paddr > highaddr) { | |
691 | pr_warning("Offset specified is greater than size of %s\n", | |
692 | dwarf_diename(sp_die)); | |
693 | return -EINVAL; | |
694 | } | |
cf6eb489 MH |
695 | tp->symbol = strdup(name); |
696 | if (tp->symbol == NULL) | |
02b95dad | 697 | return -ENOMEM; |
cf6eb489 | 698 | tp->offset = (unsigned long)(paddr - eaddr); |
4235b045 | 699 | } else |
4ea42b18 | 700 | /* This function has no name. */ |
cf6eb489 | 701 | tp->offset = (unsigned long)paddr; |
4235b045 | 702 | |
04ddd04b | 703 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
704 | if (retprobe) { |
705 | if (eaddr != paddr) { | |
04ddd04b | 706 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 707 | " a real function.\n"); |
04ddd04b MH |
708 | return -EINVAL; |
709 | } | |
cf6eb489 | 710 | tp->retprobe = true; |
04ddd04b MH |
711 | } |
712 | ||
cf6eb489 MH |
713 | return 0; |
714 | } | |
715 | ||
221d0611 MH |
716 | /* Call probe_finder callback with scope DIE */ |
717 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 718 | { |
cf6eb489 MH |
719 | Dwarf_Attribute fb_attr; |
720 | size_t nops; | |
721 | int ret; | |
722 | ||
221d0611 MH |
723 | if (!sc_die) { |
724 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
725 | return -EINVAL; | |
726 | } | |
727 | ||
728 | /* If not a real subprogram, find a real one */ | |
729 | if (dwarf_tag(sc_die) != DW_TAG_subprogram) { | |
730 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { | |
cf6eb489 MH |
731 | pr_warning("Failed to find probe point in any " |
732 | "functions.\n"); | |
733 | return -ENOENT; | |
734 | } | |
221d0611 MH |
735 | } else |
736 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 737 | |
221d0611 MH |
738 | /* Get the frame base attribute/ops from subprogram */ |
739 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 740 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 741 | if (ret <= 0 || nops == 0) { |
804b3606 | 742 | pf->fb_ops = NULL; |
7752f1b0 | 743 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
744 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
745 | pf->cfi != NULL) { | |
746 | Dwarf_Frame *frame; | |
b55a87ad MH |
747 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
748 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 749 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
750 | (uintmax_t)pf->addr); |
751 | return -ENOENT; | |
752 | } | |
7752f1b0 | 753 | #endif |
a34a9854 | 754 | } |
804b3606 | 755 | |
cf6eb489 | 756 | /* Call finder's callback handler */ |
221d0611 | 757 | ret = pf->callback(sc_die, pf); |
804b3606 MH |
758 | |
759 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
760 | pf->fb_ops = NULL; | |
cf6eb489 MH |
761 | |
762 | return ret; | |
4ea42b18 MH |
763 | } |
764 | ||
221d0611 MH |
765 | struct find_scope_param { |
766 | const char *function; | |
767 | const char *file; | |
768 | int line; | |
769 | int diff; | |
770 | Dwarf_Die *die_mem; | |
771 | bool found; | |
772 | }; | |
773 | ||
774 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
775 | { | |
776 | struct find_scope_param *fsp = data; | |
777 | const char *file; | |
778 | int lno; | |
779 | ||
780 | /* Skip if declared file name does not match */ | |
781 | if (fsp->file) { | |
782 | file = dwarf_decl_file(fn_die); | |
783 | if (!file || strcmp(fsp->file, file) != 0) | |
784 | return 0; | |
785 | } | |
786 | /* If the function name is given, that's what user expects */ | |
787 | if (fsp->function) { | |
788 | if (die_compare_name(fn_die, fsp->function)) { | |
789 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
790 | fsp->found = true; | |
791 | return 1; | |
792 | } | |
793 | } else { | |
794 | /* With the line number, find the nearest declared DIE */ | |
795 | dwarf_decl_line(fn_die, &lno); | |
796 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
797 | /* Keep a candidate and continue */ | |
798 | fsp->diff = fsp->line - lno; | |
799 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
800 | fsp->found = true; | |
801 | } | |
802 | } | |
803 | return 0; | |
804 | } | |
805 | ||
806 | /* Find an appropriate scope fits to given conditions */ | |
807 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
808 | { | |
809 | struct find_scope_param fsp = { | |
810 | .function = pf->pev->point.function, | |
811 | .file = pf->fname, | |
812 | .line = pf->lno, | |
813 | .diff = INT_MAX, | |
814 | .die_mem = die_mem, | |
815 | .found = false, | |
816 | }; | |
817 | ||
818 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
819 | ||
820 | return fsp.found ? die_mem : NULL; | |
821 | } | |
822 | ||
4cc9cec6 MH |
823 | static int probe_point_line_walker(const char *fname, int lineno, |
824 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 825 | { |
4cc9cec6 | 826 | struct probe_finder *pf = data; |
221d0611 | 827 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 828 | int ret; |
4ea42b18 | 829 | |
4cc9cec6 MH |
830 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
831 | return 0; | |
4ea42b18 | 832 | |
4cc9cec6 | 833 | pf->addr = addr; |
221d0611 MH |
834 | sc_die = find_best_scope(pf, &die_mem); |
835 | if (!sc_die) { | |
836 | pr_warning("Failed to find scope of probe point.\n"); | |
837 | return -ENOENT; | |
838 | } | |
839 | ||
840 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 841 | |
4cc9cec6 | 842 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 843 | return ret < 0 ? ret : 0; |
4cc9cec6 | 844 | } |
804b3606 | 845 | |
4cc9cec6 MH |
846 | /* Find probe point from its line number */ |
847 | static int find_probe_point_by_line(struct probe_finder *pf) | |
848 | { | |
849 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
850 | } |
851 | ||
2a9c8c36 MH |
852 | /* Find lines which match lazy pattern */ |
853 | static int find_lazy_match_lines(struct list_head *head, | |
854 | const char *fname, const char *pat) | |
855 | { | |
f50c2169 FBH |
856 | FILE *fp; |
857 | char *line = NULL; | |
858 | size_t line_len; | |
859 | ssize_t len; | |
860 | int count = 0, linenum = 1; | |
861 | ||
862 | fp = fopen(fname, "r"); | |
863 | if (!fp) { | |
864 | pr_warning("Failed to open %s: %s\n", fname, strerror(errno)); | |
b448c4b6 | 865 | return -errno; |
b55a87ad MH |
866 | } |
867 | ||
f50c2169 | 868 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 869 | |
f50c2169 FBH |
870 | if (line[len - 1] == '\n') |
871 | line[len - 1] = '\0'; | |
872 | ||
873 | if (strlazymatch(line, pat)) { | |
874 | line_list__add_line(head, linenum); | |
875 | count++; | |
2a9c8c36 | 876 | } |
f50c2169 | 877 | linenum++; |
2a9c8c36 | 878 | } |
f50c2169 FBH |
879 | |
880 | if (ferror(fp)) | |
881 | count = -errno; | |
882 | free(line); | |
883 | fclose(fp); | |
884 | ||
885 | if (count == 0) | |
886 | pr_debug("No matched lines found in %s.\n", fname); | |
887 | return count; | |
2a9c8c36 MH |
888 | } |
889 | ||
4cc9cec6 MH |
890 | static int probe_point_lazy_walker(const char *fname, int lineno, |
891 | Dwarf_Addr addr, void *data) | |
892 | { | |
893 | struct probe_finder *pf = data; | |
221d0611 | 894 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
895 | int ret; |
896 | ||
897 | if (!line_list__has_line(&pf->lcache, lineno) || | |
898 | strtailcmp(fname, pf->fname) != 0) | |
899 | return 0; | |
900 | ||
901 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
902 | lineno, (unsigned long long)addr); | |
903 | pf->addr = addr; | |
221d0611 MH |
904 | pf->lno = lineno; |
905 | sc_die = find_best_scope(pf, &die_mem); | |
906 | if (!sc_die) { | |
907 | pr_warning("Failed to find scope of probe point.\n"); | |
908 | return -ENOENT; | |
909 | } | |
910 | ||
911 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
912 | |
913 | /* | |
914 | * Continue if no error, because the lazy pattern will match | |
915 | * to other lines | |
916 | */ | |
5e814dd5 | 917 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
918 | } |
919 | ||
2a9c8c36 | 920 | /* Find probe points from lazy pattern */ |
b55a87ad | 921 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 922 | { |
b55a87ad | 923 | int ret = 0; |
2a9c8c36 MH |
924 | |
925 | if (list_empty(&pf->lcache)) { | |
926 | /* Matching lazy line pattern */ | |
927 | ret = find_lazy_match_lines(&pf->lcache, pf->fname, | |
4235b045 | 928 | pf->pev->point.lazy_line); |
f50c2169 | 929 | if (ret <= 0) |
b55a87ad | 930 | return ret; |
2a9c8c36 MH |
931 | } |
932 | ||
4cc9cec6 | 933 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
934 | } |
935 | ||
e92b85e1 MH |
936 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
937 | { | |
db0d2c64 | 938 | struct probe_finder *pf = data; |
4235b045 | 939 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 940 | Dwarf_Addr addr; |
db0d2c64 | 941 | int ret; |
e92b85e1 | 942 | |
2a9c8c36 | 943 | if (pp->lazy_line) |
db0d2c64 | 944 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
945 | else { |
946 | /* Get probe address */ | |
b55a87ad | 947 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 948 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 949 | dwarf_diename(in_die)); |
db0d2c64 | 950 | return -ENOENT; |
b55a87ad MH |
951 | } |
952 | pf->addr = addr; | |
2a9c8c36 MH |
953 | pf->addr += pp->offset; |
954 | pr_debug("found inline addr: 0x%jx\n", | |
955 | (uintmax_t)pf->addr); | |
956 | ||
db0d2c64 | 957 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 958 | } |
e92b85e1 | 959 | |
db0d2c64 | 960 | return ret; |
e92b85e1 | 961 | } |
804b3606 | 962 | |
db0d2c64 MH |
963 | /* Callback parameter with return value for libdw */ |
964 | struct dwarf_callback_param { | |
965 | void *data; | |
966 | int retval; | |
967 | }; | |
968 | ||
4ea42b18 | 969 | /* Search function from function name */ |
e92b85e1 | 970 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 971 | { |
b55a87ad MH |
972 | struct dwarf_callback_param *param = data; |
973 | struct probe_finder *pf = param->data; | |
4235b045 | 974 | struct perf_probe_point *pp = &pf->pev->point; |
ba28c59b | 975 | Dwarf_Attribute attr; |
4ea42b18 | 976 | |
e92b85e1 MH |
977 | /* Check tag and diename */ |
978 | if (dwarf_tag(sp_die) != DW_TAG_subprogram || | |
ba28c59b PN |
979 | !die_compare_name(sp_die, pp->function) || |
980 | dwarf_attr(sp_die, DW_AT_declaration, &attr)) | |
b55a87ad | 981 | return DWARF_CB_OK; |
e92b85e1 | 982 | |
7d21635a MH |
983 | /* Check declared file */ |
984 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
985 | return DWARF_CB_OK; | |
986 | ||
2a9c8c36 | 987 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 988 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
989 | dwarf_decl_line(sp_die, &pf->lno); |
990 | pf->lno += pp->line; | |
b55a87ad | 991 | param->retval = find_probe_point_by_line(pf); |
e92b85e1 MH |
992 | } else if (!dwarf_func_inline(sp_die)) { |
993 | /* Real function */ | |
2a9c8c36 | 994 | if (pp->lazy_line) |
b55a87ad | 995 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 996 | else { |
b55a87ad | 997 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
0e43e5d2 MH |
998 | pr_warning("Failed to get entry address of " |
999 | "%s.\n", dwarf_diename(sp_die)); | |
b55a87ad MH |
1000 | param->retval = -ENOENT; |
1001 | return DWARF_CB_ABORT; | |
1002 | } | |
2a9c8c36 MH |
1003 | pf->addr += pp->offset; |
1004 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1005 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1006 | } |
db0d2c64 | 1007 | } else |
e92b85e1 | 1008 | /* Inlined function: search instances */ |
db0d2c64 MH |
1009 | param->retval = die_walk_instances(sp_die, |
1010 | probe_point_inline_cb, (void *)pf); | |
e92b85e1 | 1011 | |
b55a87ad | 1012 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1013 | } |
1014 | ||
b55a87ad | 1015 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1016 | { |
b55a87ad MH |
1017 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1018 | .retval = 0}; | |
1019 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1020 | return _param.retval; | |
4ea42b18 MH |
1021 | } |
1022 | ||
cd25f8bc LM |
1023 | struct pubname_callback_param { |
1024 | char *function; | |
1025 | char *file; | |
1026 | Dwarf_Die *cu_die; | |
1027 | Dwarf_Die *sp_die; | |
1028 | int found; | |
1029 | }; | |
1030 | ||
1031 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1032 | { | |
1033 | struct pubname_callback_param *param = data; | |
1034 | ||
1035 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1036 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1037 | return DWARF_CB_OK; | |
1038 | ||
1039 | if (die_compare_name(param->sp_die, param->function)) { | |
1040 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) | |
1041 | return DWARF_CB_OK; | |
1042 | ||
1043 | if (param->file && | |
1044 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1045 | return DWARF_CB_OK; | |
1046 | ||
1047 | param->found = 1; | |
1048 | return DWARF_CB_ABORT; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | return DWARF_CB_OK; | |
1053 | } | |
1054 | ||
cf6eb489 | 1055 | /* Find probe points from debuginfo */ |
ff741783 MH |
1056 | static int debuginfo__find_probes(struct debuginfo *self, |
1057 | struct probe_finder *pf) | |
4ea42b18 | 1058 | { |
cf6eb489 | 1059 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1060 | Dwarf_Off off, noff; |
1061 | size_t cuhl; | |
1062 | Dwarf_Die *diep; | |
b55a87ad | 1063 | int ret = 0; |
804b3606 | 1064 | |
7752f1b0 | 1065 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 1066 | /* Get the call frame information from this dwarf */ |
ff741783 | 1067 | pf->cfi = dwarf_getcfi(self->dbg); |
7752f1b0 | 1068 | #endif |
a34a9854 | 1069 | |
804b3606 | 1070 | off = 0; |
cf6eb489 | 1071 | line_list__init(&pf->lcache); |
cd25f8bc LM |
1072 | |
1073 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
1074 | if (pp->function) { | |
1075 | struct pubname_callback_param pubname_param = { | |
1076 | .function = pp->function, | |
1077 | .file = pp->file, | |
1078 | .cu_die = &pf->cu_die, | |
1079 | .sp_die = &pf->sp_die, | |
2b348a77 | 1080 | .found = 0, |
cd25f8bc LM |
1081 | }; |
1082 | struct dwarf_callback_param probe_param = { | |
1083 | .data = pf, | |
1084 | }; | |
1085 | ||
ff741783 MH |
1086 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1087 | &pubname_param, 0); | |
cd25f8bc LM |
1088 | if (pubname_param.found) { |
1089 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1090 | if (ret) | |
1091 | goto found; | |
1092 | } | |
1093 | } | |
1094 | ||
804b3606 | 1095 | /* Loop on CUs (Compilation Unit) */ |
ff741783 | 1096 | while (!dwarf_nextcu(self->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1097 | /* Get the DIE(Debugging Information Entry) of this CU */ |
ff741783 | 1098 | diep = dwarf_offdie(self->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1099 | if (!diep) |
1100 | continue; | |
4ea42b18 MH |
1101 | |
1102 | /* Check if target file is included. */ | |
1103 | if (pp->file) | |
cf6eb489 | 1104 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1105 | else |
cf6eb489 | 1106 | pf->fname = NULL; |
4ea42b18 | 1107 | |
cf6eb489 | 1108 | if (!pp->file || pf->fname) { |
4ea42b18 | 1109 | if (pp->function) |
cf6eb489 | 1110 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1111 | else if (pp->lazy_line) |
cf6eb489 | 1112 | ret = find_probe_point_lazy(NULL, pf); |
b0ef0732 | 1113 | else { |
cf6eb489 MH |
1114 | pf->lno = pp->line; |
1115 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1116 | } |
8635bf6e | 1117 | if (ret < 0) |
fbee632d | 1118 | break; |
4ea42b18 | 1119 | } |
804b3606 | 1120 | off = noff; |
4ea42b18 | 1121 | } |
cd25f8bc LM |
1122 | |
1123 | found: | |
cf6eb489 | 1124 | line_list__free(&pf->lcache); |
4ea42b18 | 1125 | |
cf6eb489 MH |
1126 | return ret; |
1127 | } | |
1128 | ||
1129 | /* Add a found probe point into trace event list */ | |
221d0611 | 1130 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1131 | { |
1132 | struct trace_event_finder *tf = | |
1133 | container_of(pf, struct trace_event_finder, pf); | |
1134 | struct probe_trace_event *tev; | |
1135 | int ret, i; | |
1136 | ||
1137 | /* Check number of tevs */ | |
1138 | if (tf->ntevs == tf->max_tevs) { | |
1139 | pr_warning("Too many( > %d) probe point found.\n", | |
1140 | tf->max_tevs); | |
1141 | return -ERANGE; | |
1142 | } | |
1143 | tev = &tf->tevs[tf->ntevs++]; | |
1144 | ||
221d0611 MH |
1145 | /* Trace point should be converted from subprogram DIE */ |
1146 | ret = convert_to_trace_point(&pf->sp_die, pf->addr, | |
1147 | pf->pev->point.retprobe, &tev->point); | |
cf6eb489 MH |
1148 | if (ret < 0) |
1149 | return ret; | |
1150 | ||
1151 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, | |
1152 | tev->point.offset); | |
1153 | ||
1154 | /* Find each argument */ | |
1155 | tev->nargs = pf->pev->nargs; | |
1156 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1157 | if (tev->args == NULL) | |
1158 | return -ENOMEM; | |
1159 | for (i = 0; i < pf->pev->nargs; i++) { | |
1160 | pf->pvar = &pf->pev->args[i]; | |
1161 | pf->tvar = &tev->args[i]; | |
221d0611 MH |
1162 | /* Variable should be found from scope DIE */ |
1163 | ret = find_variable(sc_die, pf); | |
cf6eb489 MH |
1164 | if (ret != 0) |
1165 | return ret; | |
1166 | } | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
ff741783 MH |
1172 | int debuginfo__find_trace_events(struct debuginfo *self, |
1173 | struct perf_probe_event *pev, | |
1174 | struct probe_trace_event **tevs, int max_tevs) | |
cf6eb489 MH |
1175 | { |
1176 | struct trace_event_finder tf = { | |
1177 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
1178 | .max_tevs = max_tevs}; | |
1179 | int ret; | |
1180 | ||
1181 | /* Allocate result tevs array */ | |
1182 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); | |
1183 | if (*tevs == NULL) | |
1184 | return -ENOMEM; | |
1185 | ||
1186 | tf.tevs = *tevs; | |
1187 | tf.ntevs = 0; | |
1188 | ||
ff741783 | 1189 | ret = debuginfo__find_probes(self, &tf.pf); |
cf6eb489 MH |
1190 | if (ret < 0) { |
1191 | free(*tevs); | |
1192 | *tevs = NULL; | |
1193 | return ret; | |
1194 | } | |
1195 | ||
1196 | return (ret < 0) ? ret : tf.ntevs; | |
1197 | } | |
1198 | ||
1199 | #define MAX_VAR_LEN 64 | |
1200 | ||
1201 | /* Collect available variables in this scope */ | |
1202 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1203 | { | |
1204 | struct available_var_finder *af = data; | |
1205 | struct variable_list *vl; | |
1206 | char buf[MAX_VAR_LEN]; | |
1207 | int tag, ret; | |
1208 | ||
1209 | vl = &af->vls[af->nvls - 1]; | |
1210 | ||
1211 | tag = dwarf_tag(die_mem); | |
1212 | if (tag == DW_TAG_formal_parameter || | |
1213 | tag == DW_TAG_variable) { | |
1214 | ret = convert_variable_location(die_mem, af->pf.addr, | |
1215 | af->pf.fb_ops, NULL); | |
1216 | if (ret == 0) { | |
1217 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1218 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1219 | if (ret > 0) |
1220 | strlist__add(vl->vars, buf); | |
1221 | } | |
1222 | } | |
1223 | ||
fb8c5a56 | 1224 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1225 | return DIE_FIND_CB_CONTINUE; |
1226 | else | |
1227 | return DIE_FIND_CB_SIBLING; | |
1228 | } | |
1229 | ||
1230 | /* Add a found vars into available variables list */ | |
221d0611 | 1231 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1232 | { |
1233 | struct available_var_finder *af = | |
1234 | container_of(pf, struct available_var_finder, pf); | |
1235 | struct variable_list *vl; | |
f182e3e1 MH |
1236 | Dwarf_Die die_mem; |
1237 | int ret; | |
cf6eb489 MH |
1238 | |
1239 | /* Check number of tevs */ | |
1240 | if (af->nvls == af->max_vls) { | |
1241 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1242 | return -ERANGE; | |
1243 | } | |
1244 | vl = &af->vls[af->nvls++]; | |
1245 | ||
221d0611 MH |
1246 | /* Trace point should be converted from subprogram DIE */ |
1247 | ret = convert_to_trace_point(&pf->sp_die, pf->addr, | |
1248 | pf->pev->point.retprobe, &vl->point); | |
cf6eb489 MH |
1249 | if (ret < 0) |
1250 | return ret; | |
1251 | ||
1252 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1253 | vl->point.offset); | |
1254 | ||
1255 | /* Find local variables */ | |
1256 | vl->vars = strlist__new(true, NULL); | |
1257 | if (vl->vars == NULL) | |
1258 | return -ENOMEM; | |
fb8c5a56 | 1259 | af->child = true; |
221d0611 | 1260 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1261 | |
fb8c5a56 MH |
1262 | /* Find external variables */ |
1263 | if (!af->externs) | |
1264 | goto out; | |
1265 | /* Don't need to search child DIE for externs. */ | |
1266 | af->child = false; | |
f182e3e1 | 1267 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1268 | |
1269 | out: | |
cf6eb489 MH |
1270 | if (strlist__empty(vl->vars)) { |
1271 | strlist__delete(vl->vars); | |
1272 | vl->vars = NULL; | |
1273 | } | |
1274 | ||
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | /* Find available variables at given probe point */ | |
ff741783 MH |
1279 | int debuginfo__find_available_vars_at(struct debuginfo *self, |
1280 | struct perf_probe_event *pev, | |
1281 | struct variable_list **vls, | |
1282 | int max_vls, bool externs) | |
cf6eb489 MH |
1283 | { |
1284 | struct available_var_finder af = { | |
1285 | .pf = {.pev = pev, .callback = add_available_vars}, | |
fb8c5a56 | 1286 | .max_vls = max_vls, .externs = externs}; |
cf6eb489 MH |
1287 | int ret; |
1288 | ||
1289 | /* Allocate result vls array */ | |
1290 | *vls = zalloc(sizeof(struct variable_list) * max_vls); | |
1291 | if (*vls == NULL) | |
1292 | return -ENOMEM; | |
1293 | ||
1294 | af.vls = *vls; | |
1295 | af.nvls = 0; | |
1296 | ||
ff741783 | 1297 | ret = debuginfo__find_probes(self, &af.pf); |
cf6eb489 MH |
1298 | if (ret < 0) { |
1299 | /* Free vlist for error */ | |
1300 | while (af.nvls--) { | |
1301 | if (af.vls[af.nvls].point.symbol) | |
1302 | free(af.vls[af.nvls].point.symbol); | |
1303 | if (af.vls[af.nvls].vars) | |
1304 | strlist__delete(af.vls[af.nvls].vars); | |
1305 | } | |
1306 | free(af.vls); | |
1307 | *vls = NULL; | |
1308 | return ret; | |
1309 | } | |
1310 | ||
1311 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1312 | } |
1313 | ||
fb1587d8 | 1314 | /* Reverse search */ |
ff741783 MH |
1315 | int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr, |
1316 | struct perf_probe_point *ppt) | |
fb1587d8 MH |
1317 | { |
1318 | Dwarf_Die cudie, spdie, indie; | |
ff741783 | 1319 | Dwarf_Addr _addr, baseaddr; |
1d46ea2a MH |
1320 | const char *fname = NULL, *func = NULL, *tmp; |
1321 | int baseline = 0, lineno = 0, ret = 0; | |
fb1587d8 | 1322 | |
469b9b88 | 1323 | /* Adjust address with bias */ |
ff741783 MH |
1324 | addr += self->bias; |
1325 | ||
fb1587d8 | 1326 | /* Find cu die */ |
ff741783 | 1327 | if (!dwarf_addrdie(self->dbg, (Dwarf_Addr)addr - self->bias, &cudie)) { |
0e43e5d2 MH |
1328 | pr_warning("Failed to find debug information for address %lx\n", |
1329 | addr); | |
75ec5a24 MH |
1330 | ret = -EINVAL; |
1331 | goto end; | |
1332 | } | |
fb1587d8 | 1333 | |
1d46ea2a MH |
1334 | /* Find a corresponding line (filename and lineno) */ |
1335 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1336 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1337 | |
1d46ea2a | 1338 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1339 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1340 | /* Get function entry information */ |
fb1587d8 | 1341 | tmp = dwarf_diename(&spdie); |
1d46ea2a MH |
1342 | if (!tmp || |
1343 | dwarf_entrypc(&spdie, &baseaddr) != 0 || | |
1344 | dwarf_decl_line(&spdie, &baseline) != 0) | |
1345 | goto post; | |
1346 | func = tmp; | |
1347 | ||
1348 | if (addr == (unsigned long)baseaddr) | |
1349 | /* Function entry - Relative line number is 0 */ | |
1350 | lineno = baseline; | |
1351 | else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1352 | &indie)) { | |
1353 | if (dwarf_entrypc(&indie, &_addr) == 0 && | |
1354 | _addr == addr) | |
1355 | /* | |
1356 | * addr is at an inline function entry. | |
1357 | * In this case, lineno should be the call-site | |
1358 | * line number. | |
1359 | */ | |
1360 | lineno = die_get_call_lineno(&indie); | |
1361 | else { | |
1362 | /* | |
1363 | * addr is in an inline function body. | |
1364 | * Since lineno points one of the lines | |
1365 | * of the inline function, baseline should | |
1366 | * be the entry line of the inline function. | |
1367 | */ | |
b55a87ad | 1368 | tmp = dwarf_diename(&indie); |
1d46ea2a MH |
1369 | if (tmp && |
1370 | dwarf_decl_line(&spdie, &baseline) == 0) | |
1371 | func = tmp; | |
b55a87ad | 1372 | } |
fb1587d8 | 1373 | } |
1d46ea2a MH |
1374 | } |
1375 | ||
1376 | post: | |
1377 | /* Make a relative line number or an offset */ | |
1378 | if (lineno) | |
1379 | ppt->line = lineno - baseline; | |
1380 | else if (func) | |
1381 | ppt->offset = addr - (unsigned long)baseaddr; | |
1382 | ||
1383 | /* Duplicate strings */ | |
1384 | if (func) { | |
1385 | ppt->function = strdup(func); | |
02b95dad MH |
1386 | if (ppt->function == NULL) { |
1387 | ret = -ENOMEM; | |
1388 | goto end; | |
1389 | } | |
fb1587d8 | 1390 | } |
1d46ea2a MH |
1391 | if (fname) { |
1392 | ppt->file = strdup(fname); | |
1393 | if (ppt->file == NULL) { | |
1394 | if (ppt->function) { | |
1395 | free(ppt->function); | |
1396 | ppt->function = NULL; | |
1397 | } | |
1398 | ret = -ENOMEM; | |
1399 | goto end; | |
1400 | } | |
1401 | } | |
fb1587d8 | 1402 | end: |
1d46ea2a MH |
1403 | if (ret == 0 && (fname || func)) |
1404 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1405 | return ret; |
1406 | } | |
1407 | ||
f6c903f5 MH |
1408 | /* Add a line and store the src path */ |
1409 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1410 | struct line_range *lr) | |
1411 | { | |
7cf0b79e | 1412 | /* Copy source path */ |
f6c903f5 | 1413 | if (!lr->path) { |
7cf0b79e MH |
1414 | lr->path = strdup(src); |
1415 | if (lr->path == NULL) | |
1416 | return -ENOMEM; | |
f6c903f5 MH |
1417 | } |
1418 | return line_list__add_line(&lr->line_list, lineno); | |
1419 | } | |
1420 | ||
4cc9cec6 | 1421 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1422 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1423 | void *data) |
f6c903f5 | 1424 | { |
4cc9cec6 | 1425 | struct line_finder *lf = data; |
f6c903f5 | 1426 | |
4cc9cec6 | 1427 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1428 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1429 | return 0; |
f6c903f5 | 1430 | |
4cc9cec6 MH |
1431 | if (line_range_add_line(fname, lineno, lf->lr) < 0) |
1432 | return -EINVAL; | |
f6c903f5 | 1433 | |
4cc9cec6 | 1434 | return 0; |
f6c903f5 | 1435 | } |
fb1587d8 | 1436 | |
631c9def | 1437 | /* Find line range from its line number */ |
b55a87ad | 1438 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1439 | { |
4cc9cec6 | 1440 | int ret; |
f6c903f5 | 1441 | |
4cc9cec6 | 1442 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1443 | |
804b3606 | 1444 | /* Update status */ |
f6c903f5 MH |
1445 | if (ret >= 0) |
1446 | if (!list_empty(&lf->lr->line_list)) | |
1447 | ret = lf->found = 1; | |
1448 | else | |
1449 | ret = 0; /* Lines are not found */ | |
804b3606 MH |
1450 | else { |
1451 | free(lf->lr->path); | |
1452 | lf->lr->path = NULL; | |
1453 | } | |
f6c903f5 | 1454 | return ret; |
631c9def MH |
1455 | } |
1456 | ||
161a26b0 MH |
1457 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1458 | { | |
db0d2c64 | 1459 | find_line_range_by_line(in_die, data); |
36c0c588 MH |
1460 | |
1461 | /* | |
1462 | * We have to check all instances of inlined function, because | |
1463 | * some execution paths can be optimized out depends on the | |
1464 | * function argument of instances | |
1465 | */ | |
db0d2c64 | 1466 | return 0; |
161a26b0 MH |
1467 | } |
1468 | ||
631c9def | 1469 | /* Search function from function name */ |
e92b85e1 | 1470 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1471 | { |
b55a87ad MH |
1472 | struct dwarf_callback_param *param = data; |
1473 | struct line_finder *lf = param->data; | |
631c9def | 1474 | struct line_range *lr = lf->lr; |
631c9def | 1475 | |
7d21635a MH |
1476 | /* Check declared file */ |
1477 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1478 | return DWARF_CB_OK; | |
1479 | ||
e92b85e1 | 1480 | if (dwarf_tag(sp_die) == DW_TAG_subprogram && |
82175633 | 1481 | die_compare_name(sp_die, lr->function)) { |
e92b85e1 MH |
1482 | lf->fname = dwarf_decl_file(sp_die); |
1483 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1484 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1485 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1486 | if (lf->lno_s < 0) /* Overflow */ |
1487 | lf->lno_s = INT_MAX; | |
1488 | lf->lno_e = lr->offset + lr->end; | |
1489 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1490 | lf->lno_e = INT_MAX; |
d3b63d7a | 1491 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1492 | lr->start = lf->lno_s; |
1493 | lr->end = lf->lno_e; | |
db0d2c64 MH |
1494 | if (dwarf_func_inline(sp_die)) |
1495 | param->retval = die_walk_instances(sp_die, | |
1496 | line_range_inline_cb, lf); | |
1497 | else | |
b55a87ad MH |
1498 | param->retval = find_line_range_by_line(sp_die, lf); |
1499 | return DWARF_CB_ABORT; | |
631c9def | 1500 | } |
b55a87ad | 1501 | return DWARF_CB_OK; |
631c9def MH |
1502 | } |
1503 | ||
b55a87ad | 1504 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1505 | { |
b55a87ad MH |
1506 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1507 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1508 | return param.retval; | |
631c9def MH |
1509 | } |
1510 | ||
ff741783 | 1511 | int debuginfo__find_line_range(struct debuginfo *self, struct line_range *lr) |
631c9def | 1512 | { |
804b3606 | 1513 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1514 | int ret = 0; |
804b3606 MH |
1515 | Dwarf_Off off = 0, noff; |
1516 | size_t cuhl; | |
1517 | Dwarf_Die *diep; | |
6a330a3c | 1518 | const char *comp_dir; |
804b3606 | 1519 | |
cd25f8bc LM |
1520 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1521 | if (lr->function) { | |
1522 | struct pubname_callback_param pubname_param = { | |
1523 | .function = lr->function, .file = lr->file, | |
1524 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1525 | struct dwarf_callback_param line_range_param = { | |
1526 | .data = (void *)&lf, .retval = 0}; | |
1527 | ||
ff741783 MH |
1528 | dwarf_getpubnames(self->dbg, pubname_search_cb, |
1529 | &pubname_param, 0); | |
cd25f8bc LM |
1530 | if (pubname_param.found) { |
1531 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1532 | if (lf.found) | |
1533 | goto found; | |
1534 | } | |
1535 | } | |
1536 | ||
804b3606 | 1537 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1538 | while (!lf.found && ret >= 0) { |
ff741783 MH |
1539 | if (dwarf_nextcu(self->dbg, off, &noff, &cuhl, |
1540 | NULL, NULL, NULL) != 0) | |
631c9def MH |
1541 | break; |
1542 | ||
1543 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
ff741783 | 1544 | diep = dwarf_offdie(self->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1545 | if (!diep) |
1546 | continue; | |
631c9def MH |
1547 | |
1548 | /* Check if target file is included. */ | |
1549 | if (lr->file) | |
2a9c8c36 | 1550 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1551 | else |
2a9c8c36 | 1552 | lf.fname = 0; |
631c9def | 1553 | |
2a9c8c36 | 1554 | if (!lr->file || lf.fname) { |
631c9def | 1555 | if (lr->function) |
b55a87ad | 1556 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1557 | else { |
1558 | lf.lno_s = lr->start; | |
d3b63d7a | 1559 | lf.lno_e = lr->end; |
b55a87ad | 1560 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1561 | } |
631c9def | 1562 | } |
804b3606 | 1563 | off = noff; |
631c9def | 1564 | } |
6a330a3c | 1565 | |
cd25f8bc | 1566 | found: |
6a330a3c MH |
1567 | /* Store comp_dir */ |
1568 | if (lf.found) { | |
1569 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1570 | if (comp_dir) { | |
1571 | lr->comp_dir = strdup(comp_dir); | |
1572 | if (!lr->comp_dir) | |
1573 | ret = -ENOMEM; | |
1574 | } | |
1575 | } | |
1576 | ||
7cf0b79e | 1577 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1578 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1579 | } |
1580 |