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> | |
4ea42b18 MH |
29 | #include <stdlib.h> |
30 | #include <string.h> | |
31 | #include <stdarg.h> | |
cd932c59 | 32 | #include <dwarf-regs.h> |
074fc0e4 | 33 | |
124bb83c | 34 | #include <linux/bitops.h> |
89c69c0e | 35 | #include "event.h" |
a15ad2f5 | 36 | #include "dso.h" |
89c69c0e | 37 | #include "debug.h" |
5a62257a | 38 | #include "intlist.h" |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
469b9b88 | 46 | /* Dwarf FL wrappers */ |
469b9b88 MH |
47 | static char *debuginfo_path; /* Currently dummy */ |
48 | ||
49 | static const Dwfl_Callbacks offline_callbacks = { | |
50 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
51 | .debuginfo_path = &debuginfo_path, | |
52 | ||
53 | .section_address = dwfl_offline_section_address, | |
54 | ||
55 | /* We use this table for core files too. */ | |
56 | .find_elf = dwfl_build_id_find_elf, | |
57 | }; | |
58 | ||
469b9b88 | 59 | /* Get a Dwarf from offline image */ |
316c7136 | 60 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
ff741783 | 61 | const char *path) |
469b9b88 | 62 | { |
ff741783 | 63 | int fd; |
469b9b88 | 64 | |
ff741783 MH |
65 | fd = open(path, O_RDONLY); |
66 | if (fd < 0) | |
67 | return fd; | |
469b9b88 | 68 | |
316c7136 ACM |
69 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
70 | if (!dbg->dwfl) | |
ff741783 | 71 | goto error; |
469b9b88 | 72 | |
9135949d | 73 | dwfl_report_begin(dbg->dwfl); |
316c7136 ACM |
74 | dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd); |
75 | if (!dbg->mod) | |
469b9b88 MH |
76 | goto error; |
77 | ||
316c7136 ACM |
78 | dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias); |
79 | if (!dbg->dbg) | |
ff741783 MH |
80 | goto error; |
81 | ||
9135949d MH |
82 | dwfl_report_end(dbg->dwfl, NULL, NULL); |
83 | ||
ff741783 | 84 | return 0; |
469b9b88 | 85 | error: |
316c7136 ACM |
86 | if (dbg->dwfl) |
87 | dwfl_end(dbg->dwfl); | |
ff741783 MH |
88 | else |
89 | close(fd); | |
316c7136 | 90 | memset(dbg, 0, sizeof(*dbg)); |
ff741783 MH |
91 | |
92 | return -ENOENT; | |
469b9b88 MH |
93 | } |
94 | ||
a15ad2f5 | 95 | static struct debuginfo *__debuginfo__new(const char *path) |
ff741783 | 96 | { |
316c7136 ACM |
97 | struct debuginfo *dbg = zalloc(sizeof(*dbg)); |
98 | if (!dbg) | |
3b4694de MH |
99 | return NULL; |
100 | ||
04662523 ACM |
101 | if (debuginfo__init_offline_dwarf(dbg, path) < 0) |
102 | zfree(&dbg); | |
a15ad2f5 MH |
103 | if (dbg) |
104 | pr_debug("Open Debuginfo file: %s\n", path); | |
316c7136 | 105 | return dbg; |
ff741783 MH |
106 | } |
107 | ||
a15ad2f5 MH |
108 | enum dso_binary_type distro_dwarf_types[] = { |
109 | DSO_BINARY_TYPE__FEDORA_DEBUGINFO, | |
110 | DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, | |
111 | DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, | |
112 | DSO_BINARY_TYPE__BUILDID_DEBUGINFO, | |
113 | DSO_BINARY_TYPE__NOT_FOUND, | |
114 | }; | |
115 | ||
116 | struct debuginfo *debuginfo__new(const char *path) | |
117 | { | |
118 | enum dso_binary_type *type; | |
119 | char buf[PATH_MAX], nil = '\0'; | |
120 | struct dso *dso; | |
121 | struct debuginfo *dinfo = NULL; | |
122 | ||
123 | /* Try to open distro debuginfo files */ | |
124 | dso = dso__new(path); | |
125 | if (!dso) | |
126 | goto out; | |
127 | ||
128 | for (type = distro_dwarf_types; | |
129 | !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; | |
130 | type++) { | |
131 | if (dso__read_binary_type_filename(dso, *type, &nil, | |
132 | buf, PATH_MAX) < 0) | |
133 | continue; | |
134 | dinfo = __debuginfo__new(buf); | |
135 | } | |
d3a7c489 | 136 | dso__put(dso); |
a15ad2f5 MH |
137 | |
138 | out: | |
139 | /* if failed to open all distro debuginfo, open given binary */ | |
140 | return dinfo ? : __debuginfo__new(path); | |
141 | } | |
142 | ||
316c7136 | 143 | void debuginfo__delete(struct debuginfo *dbg) |
ff741783 | 144 | { |
316c7136 ACM |
145 | if (dbg) { |
146 | if (dbg->dwfl) | |
147 | dwfl_end(dbg->dwfl); | |
148 | free(dbg); | |
ff741783 | 149 | } |
3b4694de | 150 | } |
469b9b88 | 151 | |
4ea42b18 MH |
152 | /* |
153 | * Probe finder related functions | |
154 | */ | |
155 | ||
0e60836b | 156 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 157 | { |
0e60836b SD |
158 | struct probe_trace_arg_ref *ref; |
159 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
160 | if (ref != NULL) |
161 | ref->offset = offs; | |
162 | return ref; | |
163 | } | |
164 | ||
cf6eb489 MH |
165 | /* |
166 | * Convert a location into trace_arg. | |
167 | * If tvar == NULL, this just checks variable can be converted. | |
3d918a12 MH |
168 | * If fentry == true and vr_die is a parameter, do huristic search |
169 | * for the location fuzzed by function entry mcount. | |
cf6eb489 MH |
170 | */ |
171 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
3d918a12 | 172 | Dwarf_Op *fb_ops, Dwarf_Die *sp_die, |
cf6eb489 | 173 | struct probe_trace_arg *tvar) |
4ea42b18 | 174 | { |
b7dcb857 | 175 | Dwarf_Attribute attr; |
3d918a12 | 176 | Dwarf_Addr tmp = 0; |
b7dcb857 MH |
177 | Dwarf_Op *op; |
178 | size_t nops; | |
804b3606 MH |
179 | unsigned int regn; |
180 | Dwarf_Word offs = 0; | |
4235b045 | 181 | bool ref = false; |
4ea42b18 | 182 | const char *regs; |
349e8d26 | 183 | int ret, ret2 = 0; |
b7dcb857 | 184 | |
632941c4 MH |
185 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
186 | goto static_var; | |
187 | ||
b7dcb857 | 188 | /* TODO: handle more than 1 exprs */ |
3d918a12 MH |
189 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
190 | return -EINVAL; /* Broken DIE ? */ | |
191 | if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) { | |
192 | ret = dwarf_entrypc(sp_die, &tmp); | |
349e8d26 HK |
193 | if (ret) |
194 | return -ENOENT; | |
195 | ||
196 | if (probe_conf.show_location_range && | |
197 | (dwarf_tag(vr_die) == DW_TAG_variable)) { | |
198 | ret2 = -ERANGE; | |
199 | } else if (addr != tmp || | |
200 | dwarf_tag(vr_die) != DW_TAG_formal_parameter) { | |
201 | return -ENOENT; | |
202 | } | |
203 | ||
204 | ret = dwarf_highpc(sp_die, &tmp); | |
205 | if (ret) | |
3d918a12 MH |
206 | return -ENOENT; |
207 | /* | |
208 | * This is fuzzed by fentry mcount. We try to find the | |
209 | * parameter location at the earliest address. | |
210 | */ | |
211 | for (addr += 1; addr <= tmp; addr++) { | |
212 | if (dwarf_getlocation_addr(&attr, addr, &op, | |
213 | &nops, 1) > 0) | |
214 | goto found; | |
215 | } | |
b7dcb857 MH |
216 | return -ENOENT; |
217 | } | |
3d918a12 MH |
218 | found: |
219 | if (nops == 0) | |
220 | /* TODO: Support const_value */ | |
221 | return -ENOENT; | |
b7dcb857 MH |
222 | |
223 | if (op->atom == DW_OP_addr) { | |
632941c4 | 224 | static_var: |
cf6eb489 | 225 | if (!tvar) |
349e8d26 | 226 | return ret2; |
b7dcb857 MH |
227 | /* Static variables on memory (not stack), make @varname */ |
228 | ret = strlen(dwarf_diename(vr_die)); | |
229 | tvar->value = zalloc(ret + 2); | |
230 | if (tvar->value == NULL) | |
231 | return -ENOMEM; | |
232 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
233 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
234 | if (tvar->ref == NULL) | |
235 | return -ENOMEM; | |
349e8d26 | 236 | return ret2; |
b7dcb857 | 237 | } |
4ea42b18 | 238 | |
4ea42b18 | 239 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 240 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 241 | if (fb_ops == NULL) |
b55a87ad | 242 | return -ENOTSUP; |
4235b045 | 243 | ref = true; |
804b3606 | 244 | offs = op->number; |
cf6eb489 | 245 | op = &fb_ops[0]; |
804b3606 | 246 | } |
4ea42b18 | 247 | |
804b3606 MH |
248 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
249 | regn = op->atom - DW_OP_breg0; | |
250 | offs += op->number; | |
4235b045 | 251 | ref = true; |
804b3606 MH |
252 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
253 | regn = op->atom - DW_OP_reg0; | |
254 | } else if (op->atom == DW_OP_bregx) { | |
255 | regn = op->number; | |
256 | offs += op->number2; | |
4235b045 | 257 | ref = true; |
804b3606 MH |
258 | } else if (op->atom == DW_OP_regx) { |
259 | regn = op->number; | |
b55a87ad | 260 | } else { |
cf6eb489 | 261 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
262 | return -ENOTSUP; |
263 | } | |
4ea42b18 | 264 | |
cf6eb489 | 265 | if (!tvar) |
349e8d26 | 266 | return ret2; |
cf6eb489 | 267 | |
4ea42b18 | 268 | regs = get_arch_regstr(regn); |
b55a87ad | 269 | if (!regs) { |
cf6eb489 | 270 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
271 | pr_warning("Mapping for the register number %u " |
272 | "missing on this architecture.\n", regn); | |
349e8d26 | 273 | return -ENOTSUP; |
b55a87ad | 274 | } |
4ea42b18 | 275 | |
02b95dad MH |
276 | tvar->value = strdup(regs); |
277 | if (tvar->value == NULL) | |
278 | return -ENOMEM; | |
279 | ||
4235b045 | 280 | if (ref) { |
b7dcb857 | 281 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
282 | if (tvar->ref == NULL) |
283 | return -ENOMEM; | |
4235b045 | 284 | } |
349e8d26 | 285 | return ret2; |
4ea42b18 MH |
286 | } |
287 | ||
124bb83c MH |
288 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
289 | ||
b55a87ad | 290 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 291 | struct probe_trace_arg *tvar, |
73317b95 | 292 | const char *cast) |
4984912e | 293 | { |
0e60836b | 294 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
295 | Dwarf_Die type; |
296 | char buf[16]; | |
5f03cba4 | 297 | char sbuf[STRERR_BUFSIZE]; |
bcfc0821 | 298 | int bsize, boffs, total; |
4984912e MH |
299 | int ret; |
300 | ||
73317b95 MH |
301 | /* TODO: check all types */ |
302 | if (cast && strcmp(cast, "string") != 0) { | |
303 | /* Non string type is OK */ | |
304 | tvar->type = strdup(cast); | |
305 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
306 | } | |
307 | ||
bcfc0821 MH |
308 | bsize = dwarf_bitsize(vr_die); |
309 | if (bsize > 0) { | |
124bb83c | 310 | /* This is a bitfield */ |
bcfc0821 MH |
311 | boffs = dwarf_bitoffset(vr_die); |
312 | total = dwarf_bytesize(vr_die); | |
313 | if (boffs < 0 || total < 0) | |
314 | return -ENOENT; | |
315 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
316 | BYTES_TO_BITS(total)); | |
124bb83c MH |
317 | goto formatted; |
318 | } | |
319 | ||
b55a87ad MH |
320 | if (die_get_real_type(vr_die, &type) == NULL) { |
321 | pr_warning("Failed to get a type information of %s.\n", | |
322 | dwarf_diename(vr_die)); | |
323 | return -ENOENT; | |
324 | } | |
4984912e | 325 | |
b2a3c12b MH |
326 | pr_debug("%s type is %s.\n", |
327 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
328 | ||
73317b95 MH |
329 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
330 | ret = dwarf_tag(&type); | |
331 | if (ret != DW_TAG_pointer_type && | |
332 | ret != DW_TAG_array_type) { | |
333 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 334 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
335 | dwarf_diename(vr_die), dwarf_diename(&type)); |
336 | return -EINVAL; | |
337 | } | |
7ce28b5b HL |
338 | if (die_get_real_type(&type, &type) == NULL) { |
339 | pr_warning("Failed to get a type" | |
340 | " information.\n"); | |
341 | return -ENOENT; | |
342 | } | |
73317b95 | 343 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
344 | while (*ref_ptr) |
345 | ref_ptr = &(*ref_ptr)->next; | |
346 | /* Add new reference with offset +0 */ | |
0e60836b | 347 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
348 | if (*ref_ptr == NULL) { |
349 | pr_warning("Out of memory error\n"); | |
350 | return -ENOMEM; | |
351 | } | |
352 | } | |
82175633 MH |
353 | if (!die_compare_name(&type, "char") && |
354 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 355 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 356 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
357 | dwarf_diename(vr_die)); |
358 | return -EINVAL; | |
359 | } | |
360 | tvar->type = strdup(cast); | |
361 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
362 | } | |
363 | ||
bcfc0821 MH |
364 | ret = dwarf_bytesize(&type); |
365 | if (ret <= 0) | |
124bb83c MH |
366 | /* No size ... try to use default type */ |
367 | return 0; | |
bcfc0821 | 368 | ret = BYTES_TO_BITS(ret); |
4984912e | 369 | |
124bb83c MH |
370 | /* Check the bitwidth */ |
371 | if (ret > MAX_BASIC_TYPE_BITS) { | |
372 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
373 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
374 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 375 | } |
124bb83c MH |
376 | ret = snprintf(buf, 16, "%c%d", |
377 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
378 | ||
379 | formatted: | |
380 | if (ret < 0 || ret >= 16) { | |
381 | if (ret >= 16) | |
382 | ret = -E2BIG; | |
383 | pr_warning("Failed to convert variable type: %s\n", | |
5f03cba4 | 384 | strerror_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
385 | return ret; |
386 | } | |
387 | tvar->type = strdup(buf); | |
388 | if (tvar->type == NULL) | |
389 | return -ENOMEM; | |
b55a87ad | 390 | return 0; |
4984912e MH |
391 | } |
392 | ||
b55a87ad | 393 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 394 | struct perf_probe_arg_field *field, |
0e60836b | 395 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 396 | Dwarf_Die *die_mem) |
7df2f329 | 397 | { |
0e60836b | 398 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
399 | Dwarf_Die type; |
400 | Dwarf_Word offs; | |
b2a3c12b | 401 | int ret, tag; |
7df2f329 MH |
402 | |
403 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
404 | if (die_get_real_type(vr_die, &type) == NULL) { |
405 | pr_warning("Failed to get the type of %s.\n", varname); | |
406 | return -ENOENT; | |
407 | } | |
b2a3c12b MH |
408 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
409 | tag = dwarf_tag(&type); | |
410 | ||
411 | if (field->name[0] == '[' && | |
412 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
413 | if (field->next) | |
414 | /* Save original type for next field */ | |
415 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
416 | /* Get the type of this array */ | |
417 | if (die_get_real_type(&type, &type) == NULL) { | |
418 | pr_warning("Failed to get the type of %s.\n", varname); | |
419 | return -ENOENT; | |
420 | } | |
421 | pr_debug2("Array real type: (%x)\n", | |
422 | (unsigned)dwarf_dieoffset(&type)); | |
423 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 424 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
425 | if (ref == NULL) |
426 | return -ENOMEM; | |
427 | if (*ref_ptr) | |
428 | (*ref_ptr)->next = ref; | |
429 | else | |
430 | *ref_ptr = ref; | |
431 | } | |
bcfc0821 | 432 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
433 | if (!field->next) |
434 | /* Save vr_die for converting types */ | |
435 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
436 | goto next; | |
437 | } else if (tag == DW_TAG_pointer_type) { | |
438 | /* Check the pointer and dereference */ | |
b55a87ad MH |
439 | if (!field->ref) { |
440 | pr_err("Semantic error: %s must be referred by '->'\n", | |
441 | field->name); | |
442 | return -EINVAL; | |
443 | } | |
7df2f329 | 444 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
445 | if (die_get_real_type(&type, &type) == NULL) { |
446 | pr_warning("Failed to get the type of %s.\n", varname); | |
447 | return -ENOENT; | |
448 | } | |
12e5a7ae | 449 | /* Verify it is a data structure */ |
7b0295b3 HL |
450 | tag = dwarf_tag(&type); |
451 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
452 | pr_warning("%s is not a data structure nor an union.\n", | |
453 | varname); | |
b55a87ad MH |
454 | return -EINVAL; |
455 | } | |
12e5a7ae | 456 | |
0e60836b | 457 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
458 | if (ref == NULL) |
459 | return -ENOMEM; | |
7df2f329 MH |
460 | if (*ref_ptr) |
461 | (*ref_ptr)->next = ref; | |
462 | else | |
463 | *ref_ptr = ref; | |
464 | } else { | |
12e5a7ae | 465 | /* Verify it is a data structure */ |
7b0295b3 HL |
466 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
467 | pr_warning("%s is not a data structure nor an union.\n", | |
468 | varname); | |
b55a87ad MH |
469 | return -EINVAL; |
470 | } | |
b2a3c12b | 471 | if (field->name[0] == '[') { |
d939be3a | 472 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 473 | " nor array.\n", varname); |
b2a3c12b MH |
474 | return -EINVAL; |
475 | } | |
c7273835 MH |
476 | /* While prcessing unnamed field, we don't care about this */ |
477 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
478 | pr_err("Semantic error: %s must be referred by '.'\n", |
479 | field->name); | |
480 | return -EINVAL; | |
481 | } | |
482 | if (!ref) { | |
483 | pr_warning("Structure on a register is not " | |
484 | "supported yet.\n"); | |
485 | return -ENOTSUP; | |
486 | } | |
7df2f329 MH |
487 | } |
488 | ||
b55a87ad | 489 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 490 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
491 | dwarf_diename(&type), field->name); |
492 | return -EINVAL; | |
493 | } | |
7df2f329 MH |
494 | |
495 | /* Get the offset of the field */ | |
7b0295b3 HL |
496 | if (tag == DW_TAG_union_type) { |
497 | offs = 0; | |
498 | } else { | |
499 | ret = die_get_data_member_location(die_mem, &offs); | |
500 | if (ret < 0) { | |
501 | pr_warning("Failed to get the offset of %s.\n", | |
502 | field->name); | |
503 | return ret; | |
504 | } | |
b55a87ad | 505 | } |
7df2f329 MH |
506 | ref->offset += (long)offs; |
507 | ||
c7273835 MH |
508 | /* If this member is unnamed, we need to reuse this field */ |
509 | if (!dwarf_diename(die_mem)) | |
510 | return convert_variable_fields(die_mem, varname, field, | |
511 | &ref, die_mem); | |
512 | ||
b2a3c12b | 513 | next: |
7df2f329 MH |
514 | /* Converting next field */ |
515 | if (field->next) | |
b55a87ad | 516 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 517 | field->next, &ref, die_mem); |
b55a87ad MH |
518 | else |
519 | return 0; | |
7df2f329 MH |
520 | } |
521 | ||
4ea42b18 | 522 | /* Show a variables in kprobe event format */ |
b55a87ad | 523 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 524 | { |
4984912e | 525 | Dwarf_Die die_mem; |
4ea42b18 MH |
526 | int ret; |
527 | ||
b7dcb857 MH |
528 | pr_debug("Converting variable %s into trace event.\n", |
529 | dwarf_diename(vr_die)); | |
804b3606 | 530 | |
cf6eb489 | 531 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
3d918a12 | 532 | &pf->sp_die, pf->tvar); |
7d5eaba9 HK |
533 | if (ret == -ENOENT || ret == -EINVAL) { |
534 | pr_err("Failed to find the location of the '%s' variable at this address.\n" | |
535 | " Perhaps it has been optimized out.\n" | |
536 | " Use -V with the --range option to show '%s' location range.\n", | |
537 | pf->pvar->var, pf->pvar->var); | |
538 | } else if (ret == -ENOTSUP) | |
cf6eb489 | 539 | pr_err("Sorry, we don't support this variable location yet.\n"); |
0c188a07 | 540 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
541 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
542 | pf->pvar->field, &pf->tvar->ref, | |
543 | &die_mem); | |
4984912e MH |
544 | vr_die = &die_mem; |
545 | } | |
73317b95 MH |
546 | if (ret == 0) |
547 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 548 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 549 | return ret; |
4ea42b18 MH |
550 | } |
551 | ||
221d0611 MH |
552 | /* Find a variable in a scope DIE */ |
553 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 554 | { |
f182e3e1 | 555 | Dwarf_Die vr_die; |
11a1ca35 | 556 | char buf[32], *ptr; |
f182e3e1 | 557 | int ret = 0; |
4ea42b18 | 558 | |
da15bd9d WN |
559 | /* Copy raw parameters */ |
560 | if (!is_c_varname(pf->pvar->var)) | |
561 | return copy_to_probe_trace_arg(pf->tvar, pf->pvar); | |
367e94c1 | 562 | |
48481938 | 563 | if (pf->pvar->name) |
02b95dad | 564 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 565 | else { |
02b95dad MH |
566 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
567 | if (ret < 0) | |
568 | return ret; | |
11a1ca35 MH |
569 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
570 | if (ptr) | |
571 | *ptr = '_'; | |
02b95dad | 572 | pf->tvar->name = strdup(buf); |
48481938 | 573 | } |
02b95dad MH |
574 | if (pf->tvar->name == NULL) |
575 | return -ENOMEM; | |
48481938 | 576 | |
f182e3e1 | 577 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 578 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
579 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
580 | /* Search again in global variables */ | |
d13855ef HK |
581 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
582 | 0, &vr_die)) { | |
36d789a4 MH |
583 | pr_warning("Failed to find '%s' in this function.\n", |
584 | pf->pvar->var); | |
f182e3e1 | 585 | ret = -ENOENT; |
d13855ef | 586 | } |
b7dcb857 | 587 | } |
f66fedcb | 588 | if (ret >= 0) |
f182e3e1 MH |
589 | ret = convert_variable(&vr_die, pf); |
590 | ||
b7dcb857 | 591 | return ret; |
4ea42b18 MH |
592 | } |
593 | ||
cf6eb489 | 594 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
595 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
596 | Dwarf_Addr paddr, bool retprobe, | |
6cca13bd | 597 | const char *function, |
576b5237 | 598 | struct probe_trace_point *tp) |
4ea42b18 | 599 | { |
26b79524 | 600 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
601 | GElf_Sym sym; |
602 | const char *symbol; | |
603 | ||
604 | /* Verify the address is correct */ | |
605 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
606 | pr_warning("Failed to get entry address of %s\n", | |
607 | dwarf_diename(sp_die)); | |
608 | return -ENOENT; | |
609 | } | |
610 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
611 | pr_warning("Failed to get end address of %s\n", | |
612 | dwarf_diename(sp_die)); | |
613 | return -ENOENT; | |
614 | } | |
615 | if (paddr > highaddr) { | |
616 | pr_warning("Offset specified is greater than size of %s\n", | |
617 | dwarf_diename(sp_die)); | |
618 | return -EINVAL; | |
619 | } | |
620 | ||
664fee3d | 621 | symbol = dwarf_diename(sp_die); |
576b5237 | 622 | if (!symbol) { |
664fee3d MH |
623 | /* Try to get the symbol name from symtab */ |
624 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
625 | if (!symbol) { | |
626 | pr_warning("Failed to find symbol at 0x%lx\n", | |
627 | (unsigned long)paddr); | |
628 | return -ENOENT; | |
629 | } | |
630 | eaddr = sym.st_value; | |
576b5237 | 631 | } |
664fee3d | 632 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 633 | tp->address = (unsigned long)paddr; |
576b5237 MH |
634 | tp->symbol = strdup(symbol); |
635 | if (!tp->symbol) | |
636 | return -ENOMEM; | |
4235b045 | 637 | |
04ddd04b | 638 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
639 | if (retprobe) { |
640 | if (eaddr != paddr) { | |
6cca13bd MH |
641 | pr_warning("Failed to find \"%s%%return\",\n" |
642 | " because %s is an inlined function and" | |
643 | " has no return point.\n", function, | |
644 | function); | |
04ddd04b MH |
645 | return -EINVAL; |
646 | } | |
cf6eb489 | 647 | tp->retprobe = true; |
04ddd04b MH |
648 | } |
649 | ||
cf6eb489 MH |
650 | return 0; |
651 | } | |
652 | ||
221d0611 MH |
653 | /* Call probe_finder callback with scope DIE */ |
654 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 655 | { |
cf6eb489 | 656 | Dwarf_Attribute fb_attr; |
4d3b1626 | 657 | Dwarf_Frame *frame = NULL; |
cf6eb489 MH |
658 | size_t nops; |
659 | int ret; | |
660 | ||
221d0611 MH |
661 | if (!sc_die) { |
662 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
663 | return -EINVAL; | |
664 | } | |
665 | ||
666 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 667 | if (!die_is_func_def(sc_die)) { |
221d0611 | 668 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
d4c537e6 NR |
669 | if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
670 | pr_warning("Ignoring tail call from %s\n", | |
671 | dwarf_diename(&pf->sp_die)); | |
672 | return 0; | |
673 | } else { | |
674 | pr_warning("Failed to find probe point in any " | |
675 | "functions.\n"); | |
676 | return -ENOENT; | |
677 | } | |
cf6eb489 | 678 | } |
221d0611 MH |
679 | } else |
680 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 681 | |
221d0611 MH |
682 | /* Get the frame base attribute/ops from subprogram */ |
683 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 684 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 685 | if (ret <= 0 || nops == 0) { |
804b3606 | 686 | pf->fb_ops = NULL; |
7752f1b0 | 687 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 688 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
270bde1e HK |
689 | (pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) { |
690 | if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 && | |
691 | (dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) || | |
b55a87ad | 692 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { |
0e43e5d2 | 693 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad | 694 | (uintmax_t)pf->addr); |
4d3b1626 MH |
695 | free(frame); |
696 | return -ENOENT; | |
b55a87ad | 697 | } |
7752f1b0 | 698 | #endif |
a34a9854 | 699 | } |
804b3606 | 700 | |
cf6eb489 | 701 | /* Call finder's callback handler */ |
4d3b1626 | 702 | ret = pf->callback(sc_die, pf); |
804b3606 | 703 | |
4d3b1626 MH |
704 | /* Since *pf->fb_ops can be a part of frame. we should free it here. */ |
705 | free(frame); | |
804b3606 | 706 | pf->fb_ops = NULL; |
cf6eb489 MH |
707 | |
708 | return ret; | |
4ea42b18 MH |
709 | } |
710 | ||
221d0611 MH |
711 | struct find_scope_param { |
712 | const char *function; | |
713 | const char *file; | |
714 | int line; | |
715 | int diff; | |
716 | Dwarf_Die *die_mem; | |
717 | bool found; | |
718 | }; | |
719 | ||
720 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
721 | { | |
722 | struct find_scope_param *fsp = data; | |
723 | const char *file; | |
724 | int lno; | |
725 | ||
726 | /* Skip if declared file name does not match */ | |
727 | if (fsp->file) { | |
728 | file = dwarf_decl_file(fn_die); | |
729 | if (!file || strcmp(fsp->file, file) != 0) | |
730 | return 0; | |
731 | } | |
732 | /* If the function name is given, that's what user expects */ | |
733 | if (fsp->function) { | |
4c859351 | 734 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
735 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
736 | fsp->found = true; | |
737 | return 1; | |
738 | } | |
739 | } else { | |
740 | /* With the line number, find the nearest declared DIE */ | |
741 | dwarf_decl_line(fn_die, &lno); | |
742 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
743 | /* Keep a candidate and continue */ | |
744 | fsp->diff = fsp->line - lno; | |
745 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
746 | fsp->found = true; | |
747 | } | |
748 | } | |
749 | return 0; | |
750 | } | |
751 | ||
752 | /* Find an appropriate scope fits to given conditions */ | |
753 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
754 | { | |
755 | struct find_scope_param fsp = { | |
756 | .function = pf->pev->point.function, | |
757 | .file = pf->fname, | |
758 | .line = pf->lno, | |
759 | .diff = INT_MAX, | |
760 | .die_mem = die_mem, | |
761 | .found = false, | |
762 | }; | |
763 | ||
764 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
765 | ||
766 | return fsp.found ? die_mem : NULL; | |
767 | } | |
768 | ||
4cc9cec6 MH |
769 | static int probe_point_line_walker(const char *fname, int lineno, |
770 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 771 | { |
4cc9cec6 | 772 | struct probe_finder *pf = data; |
221d0611 | 773 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 774 | int ret; |
4ea42b18 | 775 | |
4cc9cec6 MH |
776 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
777 | return 0; | |
4ea42b18 | 778 | |
4cc9cec6 | 779 | pf->addr = addr; |
221d0611 MH |
780 | sc_die = find_best_scope(pf, &die_mem); |
781 | if (!sc_die) { | |
782 | pr_warning("Failed to find scope of probe point.\n"); | |
783 | return -ENOENT; | |
784 | } | |
785 | ||
786 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 787 | |
4cc9cec6 | 788 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 789 | return ret < 0 ? ret : 0; |
4cc9cec6 | 790 | } |
804b3606 | 791 | |
4cc9cec6 MH |
792 | /* Find probe point from its line number */ |
793 | static int find_probe_point_by_line(struct probe_finder *pf) | |
794 | { | |
795 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
796 | } |
797 | ||
2a9c8c36 | 798 | /* Find lines which match lazy pattern */ |
5a62257a | 799 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
800 | const char *fname, const char *pat) |
801 | { | |
f50c2169 FBH |
802 | FILE *fp; |
803 | char *line = NULL; | |
804 | size_t line_len; | |
805 | ssize_t len; | |
806 | int count = 0, linenum = 1; | |
5f03cba4 | 807 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
808 | |
809 | fp = fopen(fname, "r"); | |
810 | if (!fp) { | |
5f03cba4 MH |
811 | pr_warning("Failed to open %s: %s\n", fname, |
812 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
b448c4b6 | 813 | return -errno; |
b55a87ad MH |
814 | } |
815 | ||
f50c2169 | 816 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 817 | |
f50c2169 FBH |
818 | if (line[len - 1] == '\n') |
819 | line[len - 1] = '\0'; | |
820 | ||
821 | if (strlazymatch(line, pat)) { | |
5a62257a | 822 | intlist__add(list, linenum); |
f50c2169 | 823 | count++; |
2a9c8c36 | 824 | } |
f50c2169 | 825 | linenum++; |
2a9c8c36 | 826 | } |
f50c2169 FBH |
827 | |
828 | if (ferror(fp)) | |
829 | count = -errno; | |
830 | free(line); | |
831 | fclose(fp); | |
832 | ||
833 | if (count == 0) | |
834 | pr_debug("No matched lines found in %s.\n", fname); | |
835 | return count; | |
2a9c8c36 MH |
836 | } |
837 | ||
4cc9cec6 MH |
838 | static int probe_point_lazy_walker(const char *fname, int lineno, |
839 | Dwarf_Addr addr, void *data) | |
840 | { | |
841 | struct probe_finder *pf = data; | |
221d0611 | 842 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
843 | int ret; |
844 | ||
5a62257a | 845 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
846 | strtailcmp(fname, pf->fname) != 0) |
847 | return 0; | |
848 | ||
849 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
850 | lineno, (unsigned long long)addr); | |
851 | pf->addr = addr; | |
221d0611 MH |
852 | pf->lno = lineno; |
853 | sc_die = find_best_scope(pf, &die_mem); | |
854 | if (!sc_die) { | |
855 | pr_warning("Failed to find scope of probe point.\n"); | |
856 | return -ENOENT; | |
857 | } | |
858 | ||
859 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
860 | |
861 | /* | |
862 | * Continue if no error, because the lazy pattern will match | |
863 | * to other lines | |
864 | */ | |
5e814dd5 | 865 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
866 | } |
867 | ||
2a9c8c36 | 868 | /* Find probe points from lazy pattern */ |
b55a87ad | 869 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 870 | { |
b55a87ad | 871 | int ret = 0; |
09ed8975 | 872 | char *fpath; |
2a9c8c36 | 873 | |
5a62257a | 874 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
875 | const char *comp_dir; |
876 | ||
877 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
878 | ret = get_real_path(pf->fname, comp_dir, &fpath); | |
879 | if (ret < 0) { | |
880 | pr_warning("Failed to find source file path.\n"); | |
881 | return ret; | |
882 | } | |
883 | ||
2a9c8c36 | 884 | /* Matching lazy line pattern */ |
09ed8975 | 885 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 886 | pf->pev->point.lazy_line); |
09ed8975 | 887 | free(fpath); |
f50c2169 | 888 | if (ret <= 0) |
b55a87ad | 889 | return ret; |
2a9c8c36 MH |
890 | } |
891 | ||
4cc9cec6 | 892 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
893 | } |
894 | ||
e92b85e1 MH |
895 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
896 | { | |
db0d2c64 | 897 | struct probe_finder *pf = data; |
4235b045 | 898 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 899 | Dwarf_Addr addr; |
db0d2c64 | 900 | int ret; |
e92b85e1 | 901 | |
2a9c8c36 | 902 | if (pp->lazy_line) |
db0d2c64 | 903 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
904 | else { |
905 | /* Get probe address */ | |
b55a87ad | 906 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 907 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 908 | dwarf_diename(in_die)); |
db0d2c64 | 909 | return -ENOENT; |
b55a87ad MH |
910 | } |
911 | pf->addr = addr; | |
2a9c8c36 MH |
912 | pf->addr += pp->offset; |
913 | pr_debug("found inline addr: 0x%jx\n", | |
914 | (uintmax_t)pf->addr); | |
915 | ||
db0d2c64 | 916 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 917 | } |
e92b85e1 | 918 | |
db0d2c64 | 919 | return ret; |
e92b85e1 | 920 | } |
804b3606 | 921 | |
db0d2c64 MH |
922 | /* Callback parameter with return value for libdw */ |
923 | struct dwarf_callback_param { | |
924 | void *data; | |
925 | int retval; | |
926 | }; | |
927 | ||
4ea42b18 | 928 | /* Search function from function name */ |
e92b85e1 | 929 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 930 | { |
b55a87ad MH |
931 | struct dwarf_callback_param *param = data; |
932 | struct probe_finder *pf = param->data; | |
4235b045 | 933 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 934 | |
e92b85e1 | 935 | /* Check tag and diename */ |
0dbb1cac | 936 | if (!die_is_func_def(sp_die) || |
4c859351 | 937 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 938 | return DWARF_CB_OK; |
e92b85e1 | 939 | |
7d21635a MH |
940 | /* Check declared file */ |
941 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
942 | return DWARF_CB_OK; | |
943 | ||
4c859351 | 944 | pr_debug("Matched function: %s\n", dwarf_diename(sp_die)); |
2a9c8c36 | 945 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 946 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
947 | dwarf_decl_line(sp_die, &pf->lno); |
948 | pf->lno += pp->line; | |
b55a87ad | 949 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
950 | } else if (die_is_func_instance(sp_die)) { |
951 | /* Instances always have the entry address */ | |
952 | dwarf_entrypc(sp_die, &pf->addr); | |
e92b85e1 | 953 | /* Real function */ |
2a9c8c36 | 954 | if (pp->lazy_line) |
b55a87ad | 955 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 956 | else { |
2a9c8c36 MH |
957 | pf->addr += pp->offset; |
958 | /* TODO: Check the address in this function */ | |
cf6eb489 | 959 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 960 | } |
4c859351 | 961 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 962 | /* Inlined function: search instances */ |
db0d2c64 MH |
963 | param->retval = die_walk_instances(sp_die, |
964 | probe_point_inline_cb, (void *)pf); | |
4c859351 MH |
965 | /* This could be a non-existed inline definition */ |
966 | if (param->retval == -ENOENT && strisglob(pp->function)) | |
967 | param->retval = 0; | |
968 | } | |
969 | ||
970 | /* We need to find other candidates */ | |
971 | if (strisglob(pp->function) && param->retval >= 0) { | |
972 | param->retval = 0; /* We have to clear the result */ | |
973 | return DWARF_CB_OK; | |
974 | } | |
e92b85e1 | 975 | |
b55a87ad | 976 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
977 | } |
978 | ||
b55a87ad | 979 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 980 | { |
b55a87ad MH |
981 | struct dwarf_callback_param _param = {.data = (void *)pf, |
982 | .retval = 0}; | |
983 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
984 | return _param.retval; | |
4ea42b18 MH |
985 | } |
986 | ||
cd25f8bc LM |
987 | struct pubname_callback_param { |
988 | char *function; | |
989 | char *file; | |
990 | Dwarf_Die *cu_die; | |
991 | Dwarf_Die *sp_die; | |
992 | int found; | |
993 | }; | |
994 | ||
995 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
996 | { | |
997 | struct pubname_callback_param *param = data; | |
998 | ||
999 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1000 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1001 | return DWARF_CB_OK; | |
1002 | ||
4c859351 | 1003 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
1004 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
1005 | return DWARF_CB_OK; | |
1006 | ||
1007 | if (param->file && | |
1008 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1009 | return DWARF_CB_OK; | |
1010 | ||
1011 | param->found = 1; | |
1012 | return DWARF_CB_ABORT; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | return DWARF_CB_OK; | |
1017 | } | |
1018 | ||
270bde1e | 1019 | static int debuginfo__find_probe_location(struct debuginfo *dbg, |
ff741783 | 1020 | struct probe_finder *pf) |
4ea42b18 | 1021 | { |
cf6eb489 | 1022 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1023 | Dwarf_Off off, noff; |
1024 | size_t cuhl; | |
1025 | Dwarf_Die *diep; | |
b55a87ad | 1026 | int ret = 0; |
804b3606 | 1027 | |
804b3606 | 1028 | off = 0; |
5a62257a MH |
1029 | pf->lcache = intlist__new(NULL); |
1030 | if (!pf->lcache) | |
1031 | return -ENOMEM; | |
cd25f8bc LM |
1032 | |
1033 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1034 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1035 | struct pubname_callback_param pubname_param = { |
1036 | .function = pp->function, | |
1037 | .file = pp->file, | |
1038 | .cu_die = &pf->cu_die, | |
1039 | .sp_die = &pf->sp_die, | |
2b348a77 | 1040 | .found = 0, |
cd25f8bc LM |
1041 | }; |
1042 | struct dwarf_callback_param probe_param = { | |
1043 | .data = pf, | |
1044 | }; | |
1045 | ||
316c7136 | 1046 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1047 | &pubname_param, 0); |
cd25f8bc LM |
1048 | if (pubname_param.found) { |
1049 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1050 | if (ret) | |
1051 | goto found; | |
1052 | } | |
1053 | } | |
1054 | ||
804b3606 | 1055 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1056 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1057 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1058 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1059 | if (!diep) |
1060 | continue; | |
4ea42b18 MH |
1061 | |
1062 | /* Check if target file is included. */ | |
1063 | if (pp->file) | |
cf6eb489 | 1064 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1065 | else |
cf6eb489 | 1066 | pf->fname = NULL; |
4ea42b18 | 1067 | |
cf6eb489 | 1068 | if (!pp->file || pf->fname) { |
4ea42b18 | 1069 | if (pp->function) |
cf6eb489 | 1070 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1071 | else if (pp->lazy_line) |
f19e80c6 | 1072 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1073 | else { |
cf6eb489 MH |
1074 | pf->lno = pp->line; |
1075 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1076 | } |
8635bf6e | 1077 | if (ret < 0) |
fbee632d | 1078 | break; |
4ea42b18 | 1079 | } |
804b3606 | 1080 | off = noff; |
4ea42b18 | 1081 | } |
cd25f8bc LM |
1082 | |
1083 | found: | |
5a62257a MH |
1084 | intlist__delete(pf->lcache); |
1085 | pf->lcache = NULL; | |
4ea42b18 | 1086 | |
cf6eb489 MH |
1087 | return ret; |
1088 | } | |
1089 | ||
270bde1e HK |
1090 | /* Find probe points from debuginfo */ |
1091 | static int debuginfo__find_probes(struct debuginfo *dbg, | |
1092 | struct probe_finder *pf) | |
1093 | { | |
1094 | int ret = 0; | |
1095 | ||
1096 | #if _ELFUTILS_PREREQ(0, 142) | |
1097 | Elf *elf; | |
1098 | GElf_Ehdr ehdr; | |
1099 | GElf_Shdr shdr; | |
1100 | ||
1101 | if (pf->cfi_eh || pf->cfi_dbg) | |
1102 | return debuginfo__find_probe_location(dbg, pf); | |
1103 | ||
1104 | /* Get the call frame information from this dwarf */ | |
1105 | elf = dwarf_getelf(dbg->dbg); | |
1106 | if (elf == NULL) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1110 | return -EINVAL; | |
1111 | ||
1112 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1113 | shdr.sh_type == SHT_PROGBITS) | |
1114 | pf->cfi_eh = dwarf_getcfi_elf(elf); | |
1115 | ||
1116 | pf->cfi_dbg = dwarf_getcfi(dbg->dbg); | |
1117 | #endif | |
1118 | ||
1119 | ret = debuginfo__find_probe_location(dbg, pf); | |
1120 | return ret; | |
1121 | } | |
1122 | ||
7969ec77 MH |
1123 | struct local_vars_finder { |
1124 | struct probe_finder *pf; | |
1125 | struct perf_probe_arg *args; | |
f8bffbf1 | 1126 | bool vars; |
7969ec77 MH |
1127 | int max_args; |
1128 | int nargs; | |
1129 | int ret; | |
1130 | }; | |
1131 | ||
1132 | /* Collect available variables in this scope */ | |
1133 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1134 | { | |
1135 | struct local_vars_finder *vf = data; | |
3d918a12 | 1136 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1137 | int tag; |
1138 | ||
1139 | tag = dwarf_tag(die_mem); | |
1140 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1141 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1142 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 MH |
1143 | vf->pf->fb_ops, &pf->sp_die, |
1144 | NULL) == 0) { | |
7969ec77 MH |
1145 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1146 | if (vf->args[vf->nargs].var == NULL) { | |
1147 | vf->ret = -ENOMEM; | |
1148 | return DIE_FIND_CB_END; | |
1149 | } | |
1150 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1151 | vf->nargs++; | |
1152 | } | |
1153 | } | |
1154 | ||
1155 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1156 | return DIE_FIND_CB_CONTINUE; | |
1157 | else | |
1158 | return DIE_FIND_CB_SIBLING; | |
1159 | } | |
1160 | ||
1161 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1162 | struct perf_probe_arg *args) | |
1163 | { | |
1164 | Dwarf_Die die_mem; | |
1165 | int i; | |
1166 | int n = 0; | |
f8bffbf1 | 1167 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1168 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1169 | ||
1170 | for (i = 0; i < pf->pev->nargs; i++) { | |
1171 | /* var never be NULL */ | |
f8bffbf1 MH |
1172 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1173 | vf.vars = true; | |
1174 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1175 | /* Copy normal argument */ |
1176 | args[n] = pf->pev->args[i]; | |
1177 | n++; | |
f8bffbf1 | 1178 | continue; |
7969ec77 | 1179 | } |
f8bffbf1 MH |
1180 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1181 | vf.nargs = n; | |
1182 | /* Special local variables */ | |
1183 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1184 | &die_mem); | |
1185 | pr_debug(" (%d)\n", vf.nargs - n); | |
1186 | if (vf.ret < 0) | |
1187 | return vf.ret; | |
1188 | n = vf.nargs; | |
7969ec77 MH |
1189 | } |
1190 | return n; | |
1191 | } | |
1192 | ||
cf6eb489 | 1193 | /* Add a found probe point into trace event list */ |
221d0611 | 1194 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1195 | { |
1196 | struct trace_event_finder *tf = | |
1197 | container_of(pf, struct trace_event_finder, pf); | |
6cca13bd | 1198 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1199 | struct probe_trace_event *tev; |
092b1f0b | 1200 | struct perf_probe_arg *args = NULL; |
cf6eb489 MH |
1201 | int ret, i; |
1202 | ||
1203 | /* Check number of tevs */ | |
1204 | if (tf->ntevs == tf->max_tevs) { | |
1205 | pr_warning("Too many( > %d) probe point found.\n", | |
1206 | tf->max_tevs); | |
1207 | return -ERANGE; | |
1208 | } | |
1209 | tev = &tf->tevs[tf->ntevs++]; | |
1210 | ||
221d0611 | 1211 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1212 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
6cca13bd | 1213 | pp->retprobe, pp->function, &tev->point); |
cf6eb489 | 1214 | if (ret < 0) |
092b1f0b | 1215 | goto end; |
cf6eb489 | 1216 | |
4c859351 | 1217 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
092b1f0b WN |
1218 | if (!tev->point.realname) { |
1219 | ret = -ENOMEM; | |
1220 | goto end; | |
1221 | } | |
4c859351 | 1222 | |
cf6eb489 MH |
1223 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1224 | tev->point.offset); | |
1225 | ||
7969ec77 MH |
1226 | /* Expand special probe argument if exist */ |
1227 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
092b1f0b WN |
1228 | if (args == NULL) { |
1229 | ret = -ENOMEM; | |
1230 | goto end; | |
1231 | } | |
7969ec77 MH |
1232 | |
1233 | ret = expand_probe_args(sc_die, pf, args); | |
1234 | if (ret < 0) | |
1235 | goto end; | |
1236 | ||
1237 | tev->nargs = ret; | |
1238 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1239 | if (tev->args == NULL) { | |
1240 | ret = -ENOMEM; | |
1241 | goto end; | |
1242 | } | |
1243 | ||
1244 | /* Find each argument */ | |
1245 | for (i = 0; i < tev->nargs; i++) { | |
1246 | pf->pvar = &args[i]; | |
cf6eb489 | 1247 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1248 | /* Variable should be found from scope DIE */ |
1249 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1250 | if (ret != 0) |
7969ec77 | 1251 | break; |
cf6eb489 MH |
1252 | } |
1253 | ||
7969ec77 | 1254 | end: |
092b1f0b WN |
1255 | if (ret) { |
1256 | clear_probe_trace_event(tev); | |
1257 | tf->ntevs--; | |
1258 | } | |
7969ec77 MH |
1259 | free(args); |
1260 | return ret; | |
cf6eb489 MH |
1261 | } |
1262 | ||
1263 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
316c7136 | 1264 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1265 | struct perf_probe_event *pev, |
ddb2f58f | 1266 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1267 | { |
1268 | struct trace_event_finder tf = { | |
1269 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
ddb2f58f | 1270 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
0196e787 | 1271 | int ret, i; |
cf6eb489 MH |
1272 | |
1273 | /* Allocate result tevs array */ | |
ddb2f58f | 1274 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1275 | if (*tevs == NULL) |
1276 | return -ENOMEM; | |
1277 | ||
1278 | tf.tevs = *tevs; | |
1279 | tf.ntevs = 0; | |
1280 | ||
316c7136 | 1281 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cf6eb489 | 1282 | if (ret < 0) { |
0196e787 MH |
1283 | for (i = 0; i < tf.ntevs; i++) |
1284 | clear_probe_trace_event(&tf.tevs[i]); | |
04662523 | 1285 | zfree(tevs); |
cf6eb489 MH |
1286 | return ret; |
1287 | } | |
1288 | ||
1289 | return (ret < 0) ? ret : tf.ntevs; | |
1290 | } | |
1291 | ||
cf6eb489 MH |
1292 | /* Collect available variables in this scope */ |
1293 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1294 | { | |
1295 | struct available_var_finder *af = data; | |
1296 | struct variable_list *vl; | |
cf6eb489 MH |
1297 | int tag, ret; |
1298 | ||
1299 | vl = &af->vls[af->nvls - 1]; | |
1300 | ||
1301 | tag = dwarf_tag(die_mem); | |
1302 | if (tag == DW_TAG_formal_parameter || | |
1303 | tag == DW_TAG_variable) { | |
1304 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 MH |
1305 | af->pf.fb_ops, &af->pf.sp_die, |
1306 | NULL); | |
349e8d26 HK |
1307 | if (ret == 0 || ret == -ERANGE) { |
1308 | int ret2; | |
1309 | bool externs = !af->child; | |
fb9596d1 HK |
1310 | struct strbuf buf; |
1311 | ||
1312 | strbuf_init(&buf, 64); | |
349e8d26 HK |
1313 | |
1314 | if (probe_conf.show_location_range) { | |
1315 | if (!externs) { | |
1316 | if (ret) | |
1317 | strbuf_addf(&buf, "[INV]\t"); | |
1318 | else | |
1319 | strbuf_addf(&buf, "[VAL]\t"); | |
1320 | } else | |
1321 | strbuf_addf(&buf, "[EXT]\t"); | |
1322 | } | |
1323 | ||
1324 | ret2 = die_get_varname(die_mem, &buf); | |
1325 | ||
1326 | if (!ret2 && probe_conf.show_location_range && | |
1327 | !externs) { | |
1328 | strbuf_addf(&buf, "\t"); | |
1329 | ret2 = die_get_var_range(&af->pf.sp_die, | |
1330 | die_mem, &buf); | |
1331 | } | |
1332 | ||
1333 | pr_debug("Add new var: %s\n", buf.buf); | |
1334 | if (ret2 == 0) { | |
fb9596d1 HK |
1335 | strlist__add(vl->vars, |
1336 | strbuf_detach(&buf, NULL)); | |
1337 | } | |
1338 | strbuf_release(&buf); | |
cf6eb489 MH |
1339 | } |
1340 | } | |
1341 | ||
fb8c5a56 | 1342 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1343 | return DIE_FIND_CB_CONTINUE; |
1344 | else | |
1345 | return DIE_FIND_CB_SIBLING; | |
1346 | } | |
1347 | ||
1348 | /* Add a found vars into available variables list */ | |
221d0611 | 1349 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1350 | { |
1351 | struct available_var_finder *af = | |
1352 | container_of(pf, struct available_var_finder, pf); | |
6cca13bd | 1353 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1354 | struct variable_list *vl; |
f182e3e1 MH |
1355 | Dwarf_Die die_mem; |
1356 | int ret; | |
cf6eb489 MH |
1357 | |
1358 | /* Check number of tevs */ | |
1359 | if (af->nvls == af->max_vls) { | |
1360 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1361 | return -ERANGE; | |
1362 | } | |
1363 | vl = &af->vls[af->nvls++]; | |
1364 | ||
221d0611 | 1365 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1366 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
6cca13bd | 1367 | pp->retprobe, pp->function, &vl->point); |
cf6eb489 MH |
1368 | if (ret < 0) |
1369 | return ret; | |
1370 | ||
1371 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1372 | vl->point.offset); | |
1373 | ||
1374 | /* Find local variables */ | |
4a77e218 | 1375 | vl->vars = strlist__new(NULL, NULL); |
cf6eb489 MH |
1376 | if (vl->vars == NULL) |
1377 | return -ENOMEM; | |
fb8c5a56 | 1378 | af->child = true; |
221d0611 | 1379 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1380 | |
fb8c5a56 | 1381 | /* Find external variables */ |
ddb2f58f | 1382 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1383 | goto out; |
ddb2f58f | 1384 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1385 | af->child = false; |
f182e3e1 | 1386 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1387 | |
1388 | out: | |
cf6eb489 MH |
1389 | if (strlist__empty(vl->vars)) { |
1390 | strlist__delete(vl->vars); | |
1391 | vl->vars = NULL; | |
1392 | } | |
1393 | ||
1394 | return ret; | |
1395 | } | |
1396 | ||
69e96eaa MH |
1397 | /* |
1398 | * Find available variables at given probe point | |
1399 | * Return the number of found probe points. Return 0 if there is no | |
1400 | * matched probe point. Return <0 if an error occurs. | |
1401 | */ | |
316c7136 | 1402 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1403 | struct perf_probe_event *pev, |
ddb2f58f | 1404 | struct variable_list **vls) |
cf6eb489 MH |
1405 | { |
1406 | struct available_var_finder af = { | |
1407 | .pf = {.pev = pev, .callback = add_available_vars}, | |
316c7136 | 1408 | .mod = dbg->mod, |
ddb2f58f | 1409 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1410 | int ret; |
1411 | ||
1412 | /* Allocate result vls array */ | |
ddb2f58f | 1413 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1414 | if (*vls == NULL) |
1415 | return -ENOMEM; | |
1416 | ||
1417 | af.vls = *vls; | |
1418 | af.nvls = 0; | |
1419 | ||
316c7136 | 1420 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1421 | if (ret < 0) { |
1422 | /* Free vlist for error */ | |
1423 | while (af.nvls--) { | |
74cf249d | 1424 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1425 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1426 | } |
04662523 | 1427 | zfree(vls); |
cf6eb489 MH |
1428 | return ret; |
1429 | } | |
1430 | ||
1431 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1432 | } |
1433 | ||
9b239a12 MH |
1434 | /* For the kernel module, we need a special code to get a DIE */ |
1435 | static int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs) | |
1436 | { | |
1437 | int n, i; | |
1438 | Elf32_Word shndx; | |
1439 | Elf_Scn *scn; | |
1440 | Elf *elf; | |
1441 | GElf_Shdr mem, *shdr; | |
1442 | const char *p; | |
1443 | ||
1444 | elf = dwfl_module_getelf(dbg->mod, &dbg->bias); | |
1445 | if (!elf) | |
1446 | return -EINVAL; | |
1447 | ||
1448 | /* Get the number of relocations */ | |
1449 | n = dwfl_module_relocations(dbg->mod); | |
1450 | if (n < 0) | |
1451 | return -ENOENT; | |
1452 | /* Search the relocation related .text section */ | |
1453 | for (i = 0; i < n; i++) { | |
1454 | p = dwfl_module_relocation_info(dbg->mod, i, &shndx); | |
1455 | if (strcmp(p, ".text") == 0) { | |
1456 | /* OK, get the section header */ | |
1457 | scn = elf_getscn(elf, shndx); | |
1458 | if (!scn) | |
1459 | return -ENOENT; | |
1460 | shdr = gelf_getshdr(scn, &mem); | |
1461 | if (!shdr) | |
1462 | return -ENOENT; | |
1463 | *offs = shdr->sh_addr; | |
1464 | } | |
1465 | } | |
1466 | return 0; | |
1467 | } | |
1468 | ||
fb1587d8 | 1469 | /* Reverse search */ |
316c7136 | 1470 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1471 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1472 | { |
1473 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1474 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1475 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1476 | int baseline = 0, lineno = 0, ret = 0; |
9b239a12 | 1477 | bool reloc = false; |
fb1587d8 | 1478 | |
9b239a12 | 1479 | retry: |
fb1587d8 | 1480 | /* Find cu die */ |
0104fe69 | 1481 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
9b239a12 MH |
1482 | if (!reloc && debuginfo__get_text_offset(dbg, &baseaddr) == 0) { |
1483 | addr += baseaddr; | |
1484 | reloc = true; | |
1485 | goto retry; | |
1486 | } | |
0e43e5d2 MH |
1487 | pr_warning("Failed to find debug information for address %lx\n", |
1488 | addr); | |
75ec5a24 MH |
1489 | ret = -EINVAL; |
1490 | goto end; | |
1491 | } | |
fb1587d8 | 1492 | |
1d46ea2a MH |
1493 | /* Find a corresponding line (filename and lineno) */ |
1494 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1495 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1496 | |
1d46ea2a | 1497 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1498 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1499 | /* Get function entry information */ |
e08cfd4b MH |
1500 | func = basefunc = dwarf_diename(&spdie); |
1501 | if (!func || | |
1d46ea2a | 1502 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1503 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1504 | lineno = 0; | |
1d46ea2a | 1505 | goto post; |
e08cfd4b | 1506 | } |
1d46ea2a | 1507 | |
1b286bdd | 1508 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1509 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1510 | /* Function entry - Relative line number is 0 */ |
1511 | lineno = baseline; | |
e08cfd4b MH |
1512 | goto post; |
1513 | } | |
1514 | ||
1515 | /* Track down the inline functions step by step */ | |
1516 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1517 | &indie)) { | |
1518 | /* There is an inline function */ | |
1d46ea2a | 1519 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1520 | _addr == addr) { |
1d46ea2a MH |
1521 | /* |
1522 | * addr is at an inline function entry. | |
1523 | * In this case, lineno should be the call-site | |
e08cfd4b | 1524 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1525 | */ |
1526 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1527 | fname = die_get_call_file(&indie); |
1528 | break; | |
1529 | } else { | |
1d46ea2a MH |
1530 | /* |
1531 | * addr is in an inline function body. | |
1532 | * Since lineno points one of the lines | |
1533 | * of the inline function, baseline should | |
1534 | * be the entry line of the inline function. | |
1535 | */ | |
b55a87ad | 1536 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1537 | if (!tmp || |
1538 | dwarf_decl_line(&indie, &baseline) != 0) | |
1539 | break; | |
1540 | func = tmp; | |
1541 | spdie = indie; | |
b55a87ad | 1542 | } |
fb1587d8 | 1543 | } |
e08cfd4b MH |
1544 | /* Verify the lineno and baseline are in a same file */ |
1545 | tmp = dwarf_decl_file(&spdie); | |
1546 | if (!tmp || strcmp(tmp, fname) != 0) | |
1547 | lineno = 0; | |
1d46ea2a MH |
1548 | } |
1549 | ||
1550 | post: | |
1551 | /* Make a relative line number or an offset */ | |
1552 | if (lineno) | |
1553 | ppt->line = lineno - baseline; | |
e08cfd4b | 1554 | else if (basefunc) { |
1d46ea2a | 1555 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1556 | func = basefunc; |
1557 | } | |
1d46ea2a MH |
1558 | |
1559 | /* Duplicate strings */ | |
1560 | if (func) { | |
1561 | ppt->function = strdup(func); | |
02b95dad MH |
1562 | if (ppt->function == NULL) { |
1563 | ret = -ENOMEM; | |
1564 | goto end; | |
1565 | } | |
fb1587d8 | 1566 | } |
1d46ea2a MH |
1567 | if (fname) { |
1568 | ppt->file = strdup(fname); | |
1569 | if (ppt->file == NULL) { | |
04662523 | 1570 | zfree(&ppt->function); |
1d46ea2a MH |
1571 | ret = -ENOMEM; |
1572 | goto end; | |
1573 | } | |
1574 | } | |
fb1587d8 | 1575 | end: |
1d46ea2a MH |
1576 | if (ret == 0 && (fname || func)) |
1577 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1578 | return ret; |
1579 | } | |
1580 | ||
f6c903f5 MH |
1581 | /* Add a line and store the src path */ |
1582 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1583 | struct line_range *lr) | |
1584 | { | |
7cf0b79e | 1585 | /* Copy source path */ |
f6c903f5 | 1586 | if (!lr->path) { |
7cf0b79e MH |
1587 | lr->path = strdup(src); |
1588 | if (lr->path == NULL) | |
1589 | return -ENOMEM; | |
f6c903f5 | 1590 | } |
5a62257a | 1591 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1592 | } |
1593 | ||
4cc9cec6 | 1594 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1595 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1596 | void *data) |
f6c903f5 | 1597 | { |
4cc9cec6 | 1598 | struct line_finder *lf = data; |
202c7c12 | 1599 | int err; |
f6c903f5 | 1600 | |
4cc9cec6 | 1601 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1602 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1603 | return 0; |
f6c903f5 | 1604 | |
202c7c12 NK |
1605 | err = line_range_add_line(fname, lineno, lf->lr); |
1606 | if (err < 0 && err != -EEXIST) | |
1607 | return err; | |
f6c903f5 | 1608 | |
4cc9cec6 | 1609 | return 0; |
f6c903f5 | 1610 | } |
fb1587d8 | 1611 | |
631c9def | 1612 | /* Find line range from its line number */ |
b55a87ad | 1613 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1614 | { |
4cc9cec6 | 1615 | int ret; |
f6c903f5 | 1616 | |
4cc9cec6 | 1617 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1618 | |
804b3606 | 1619 | /* Update status */ |
f6c903f5 | 1620 | if (ret >= 0) |
5a62257a | 1621 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1622 | ret = lf->found = 1; |
1623 | else | |
1624 | ret = 0; /* Lines are not found */ | |
804b3606 | 1625 | else { |
04662523 | 1626 | zfree(&lf->lr->path); |
804b3606 | 1627 | } |
f6c903f5 | 1628 | return ret; |
631c9def MH |
1629 | } |
1630 | ||
161a26b0 MH |
1631 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1632 | { | |
182c228e | 1633 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1634 | |
1635 | /* | |
1636 | * We have to check all instances of inlined function, because | |
1637 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1638 | * function argument of instances. However, if an error occurs, |
1639 | * it should be handled by the caller. | |
36c0c588 | 1640 | */ |
182c228e | 1641 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1642 | } |
1643 | ||
0dbb1cac | 1644 | /* Search function definition from function name */ |
e92b85e1 | 1645 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1646 | { |
b55a87ad MH |
1647 | struct dwarf_callback_param *param = data; |
1648 | struct line_finder *lf = param->data; | |
631c9def | 1649 | struct line_range *lr = lf->lr; |
631c9def | 1650 | |
7d21635a MH |
1651 | /* Check declared file */ |
1652 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1653 | return DWARF_CB_OK; | |
1654 | ||
0dbb1cac | 1655 | if (die_is_func_def(sp_die) && |
4c859351 | 1656 | die_match_name(sp_die, lr->function)) { |
e92b85e1 MH |
1657 | lf->fname = dwarf_decl_file(sp_die); |
1658 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1659 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1660 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1661 | if (lf->lno_s < 0) /* Overflow */ |
1662 | lf->lno_s = INT_MAX; | |
1663 | lf->lno_e = lr->offset + lr->end; | |
1664 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1665 | lf->lno_e = INT_MAX; |
d3b63d7a | 1666 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1667 | lr->start = lf->lno_s; |
1668 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1669 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1670 | param->retval = die_walk_instances(sp_die, |
1671 | line_range_inline_cb, lf); | |
1672 | else | |
b55a87ad MH |
1673 | param->retval = find_line_range_by_line(sp_die, lf); |
1674 | return DWARF_CB_ABORT; | |
631c9def | 1675 | } |
b55a87ad | 1676 | return DWARF_CB_OK; |
631c9def MH |
1677 | } |
1678 | ||
b55a87ad | 1679 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1680 | { |
b55a87ad MH |
1681 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1682 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1683 | return param.retval; | |
631c9def MH |
1684 | } |
1685 | ||
316c7136 | 1686 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1687 | { |
804b3606 | 1688 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1689 | int ret = 0; |
804b3606 MH |
1690 | Dwarf_Off off = 0, noff; |
1691 | size_t cuhl; | |
1692 | Dwarf_Die *diep; | |
6a330a3c | 1693 | const char *comp_dir; |
804b3606 | 1694 | |
cd25f8bc LM |
1695 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1696 | if (lr->function) { | |
1697 | struct pubname_callback_param pubname_param = { | |
1698 | .function = lr->function, .file = lr->file, | |
1699 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1700 | struct dwarf_callback_param line_range_param = { | |
1701 | .data = (void *)&lf, .retval = 0}; | |
1702 | ||
316c7136 | 1703 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1704 | &pubname_param, 0); |
cd25f8bc LM |
1705 | if (pubname_param.found) { |
1706 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1707 | if (lf.found) | |
1708 | goto found; | |
1709 | } | |
1710 | } | |
1711 | ||
804b3606 | 1712 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1713 | while (!lf.found && ret >= 0) { |
316c7136 | 1714 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1715 | NULL, NULL, NULL) != 0) |
631c9def MH |
1716 | break; |
1717 | ||
1718 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1719 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1720 | if (!diep) |
1721 | continue; | |
631c9def MH |
1722 | |
1723 | /* Check if target file is included. */ | |
1724 | if (lr->file) | |
2a9c8c36 | 1725 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1726 | else |
2a9c8c36 | 1727 | lf.fname = 0; |
631c9def | 1728 | |
2a9c8c36 | 1729 | if (!lr->file || lf.fname) { |
631c9def | 1730 | if (lr->function) |
b55a87ad | 1731 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1732 | else { |
1733 | lf.lno_s = lr->start; | |
d3b63d7a | 1734 | lf.lno_e = lr->end; |
b55a87ad | 1735 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1736 | } |
631c9def | 1737 | } |
804b3606 | 1738 | off = noff; |
631c9def | 1739 | } |
6a330a3c | 1740 | |
cd25f8bc | 1741 | found: |
6a330a3c MH |
1742 | /* Store comp_dir */ |
1743 | if (lf.found) { | |
1744 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1745 | if (comp_dir) { | |
1746 | lr->comp_dir = strdup(comp_dir); | |
1747 | if (!lr->comp_dir) | |
1748 | ret = -ENOMEM; | |
1749 | } | |
1750 | } | |
1751 | ||
7cf0b79e | 1752 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1753 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1754 | } |
1755 | ||
09ed8975 NA |
1756 | /* |
1757 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
1758 | * and chop off leading directories that do not exist. Result is passed back as | |
1759 | * a newly allocated path on success. | |
1760 | * Return 0 if file was found and readable, -errno otherwise. | |
1761 | */ | |
1762 | int get_real_path(const char *raw_path, const char *comp_dir, | |
1763 | char **new_path) | |
1764 | { | |
1765 | const char *prefix = symbol_conf.source_prefix; | |
1766 | ||
1767 | if (!prefix) { | |
1768 | if (raw_path[0] != '/' && comp_dir) | |
1769 | /* If not an absolute path, try to use comp_dir */ | |
1770 | prefix = comp_dir; | |
1771 | else { | |
1772 | if (access(raw_path, R_OK) == 0) { | |
1773 | *new_path = strdup(raw_path); | |
1774 | return *new_path ? 0 : -ENOMEM; | |
1775 | } else | |
1776 | return -errno; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
1781 | if (!*new_path) | |
1782 | return -ENOMEM; | |
1783 | ||
1784 | for (;;) { | |
1785 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
1786 | ||
1787 | if (access(*new_path, R_OK) == 0) | |
1788 | return 0; | |
1789 | ||
1790 | if (!symbol_conf.source_prefix) { | |
1791 | /* In case of searching comp_dir, don't retry */ | |
1792 | zfree(new_path); | |
1793 | return -errno; | |
1794 | } | |
1795 | ||
1796 | switch (errno) { | |
1797 | case ENAMETOOLONG: | |
1798 | case ENOENT: | |
1799 | case EROFS: | |
1800 | case EFAULT: | |
1801 | raw_path = strchr(++raw_path, '/'); | |
1802 | if (!raw_path) { | |
1803 | zfree(new_path); | |
1804 | return -ENOENT; | |
1805 | } | |
1806 | continue; | |
1807 | ||
1808 | default: | |
1809 | zfree(new_path); | |
1810 | return -errno; | |
1811 | } | |
1812 | } | |
1813 | } |