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Commit | Line | Data |
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4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
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 | 299 | int ret; |
19f00b01 | 300 | char sign; |
4984912e | 301 | |
73317b95 | 302 | /* TODO: check all types */ |
19f00b01 NA |
303 | if (cast && strcmp(cast, "string") != 0 && |
304 | strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) { | |
73317b95 | 305 | /* Non string type is OK */ |
19f00b01 | 306 | /* and respect signedness cast */ |
73317b95 MH |
307 | tvar->type = strdup(cast); |
308 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
309 | } | |
310 | ||
bcfc0821 MH |
311 | bsize = dwarf_bitsize(vr_die); |
312 | if (bsize > 0) { | |
124bb83c | 313 | /* This is a bitfield */ |
bcfc0821 MH |
314 | boffs = dwarf_bitoffset(vr_die); |
315 | total = dwarf_bytesize(vr_die); | |
316 | if (boffs < 0 || total < 0) | |
317 | return -ENOENT; | |
318 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
319 | BYTES_TO_BITS(total)); | |
124bb83c MH |
320 | goto formatted; |
321 | } | |
322 | ||
b55a87ad MH |
323 | if (die_get_real_type(vr_die, &type) == NULL) { |
324 | pr_warning("Failed to get a type information of %s.\n", | |
325 | dwarf_diename(vr_die)); | |
326 | return -ENOENT; | |
327 | } | |
4984912e | 328 | |
b2a3c12b MH |
329 | pr_debug("%s type is %s.\n", |
330 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
331 | ||
73317b95 MH |
332 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
333 | ret = dwarf_tag(&type); | |
334 | if (ret != DW_TAG_pointer_type && | |
335 | ret != DW_TAG_array_type) { | |
336 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 337 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
338 | dwarf_diename(vr_die), dwarf_diename(&type)); |
339 | return -EINVAL; | |
340 | } | |
7ce28b5b HL |
341 | if (die_get_real_type(&type, &type) == NULL) { |
342 | pr_warning("Failed to get a type" | |
343 | " information.\n"); | |
344 | return -ENOENT; | |
345 | } | |
73317b95 | 346 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
347 | while (*ref_ptr) |
348 | ref_ptr = &(*ref_ptr)->next; | |
349 | /* Add new reference with offset +0 */ | |
0e60836b | 350 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
351 | if (*ref_ptr == NULL) { |
352 | pr_warning("Out of memory error\n"); | |
353 | return -ENOMEM; | |
354 | } | |
355 | } | |
82175633 MH |
356 | if (!die_compare_name(&type, "char") && |
357 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 358 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 359 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
360 | dwarf_diename(vr_die)); |
361 | return -EINVAL; | |
362 | } | |
363 | tvar->type = strdup(cast); | |
364 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
365 | } | |
366 | ||
19f00b01 NA |
367 | if (cast && (strcmp(cast, "u") == 0)) |
368 | sign = 'u'; | |
369 | else if (cast && (strcmp(cast, "s") == 0)) | |
370 | sign = 's'; | |
371 | else | |
372 | sign = die_is_signed_type(&type) ? 's' : 'u'; | |
373 | ||
bcfc0821 MH |
374 | ret = dwarf_bytesize(&type); |
375 | if (ret <= 0) | |
124bb83c MH |
376 | /* No size ... try to use default type */ |
377 | return 0; | |
bcfc0821 | 378 | ret = BYTES_TO_BITS(ret); |
4984912e | 379 | |
124bb83c MH |
380 | /* Check the bitwidth */ |
381 | if (ret > MAX_BASIC_TYPE_BITS) { | |
382 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
383 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
384 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 385 | } |
19f00b01 | 386 | ret = snprintf(buf, 16, "%c%d", sign, ret); |
124bb83c MH |
387 | |
388 | formatted: | |
389 | if (ret < 0 || ret >= 16) { | |
390 | if (ret >= 16) | |
391 | ret = -E2BIG; | |
392 | pr_warning("Failed to convert variable type: %s\n", | |
c8b5f2c9 | 393 | str_error_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
394 | return ret; |
395 | } | |
396 | tvar->type = strdup(buf); | |
397 | if (tvar->type == NULL) | |
398 | return -ENOMEM; | |
b55a87ad | 399 | return 0; |
4984912e MH |
400 | } |
401 | ||
b55a87ad | 402 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 403 | struct perf_probe_arg_field *field, |
0e60836b | 404 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 405 | Dwarf_Die *die_mem) |
7df2f329 | 406 | { |
0e60836b | 407 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
408 | Dwarf_Die type; |
409 | Dwarf_Word offs; | |
b2a3c12b | 410 | int ret, tag; |
7df2f329 MH |
411 | |
412 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
413 | if (die_get_real_type(vr_die, &type) == NULL) { |
414 | pr_warning("Failed to get the type of %s.\n", varname); | |
415 | return -ENOENT; | |
416 | } | |
b2a3c12b MH |
417 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
418 | tag = dwarf_tag(&type); | |
419 | ||
420 | if (field->name[0] == '[' && | |
421 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
422 | if (field->next) | |
423 | /* Save original type for next field */ | |
424 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
425 | /* Get the type of this array */ | |
426 | if (die_get_real_type(&type, &type) == NULL) { | |
427 | pr_warning("Failed to get the type of %s.\n", varname); | |
428 | return -ENOENT; | |
429 | } | |
430 | pr_debug2("Array real type: (%x)\n", | |
431 | (unsigned)dwarf_dieoffset(&type)); | |
432 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 433 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
434 | if (ref == NULL) |
435 | return -ENOMEM; | |
436 | if (*ref_ptr) | |
437 | (*ref_ptr)->next = ref; | |
438 | else | |
439 | *ref_ptr = ref; | |
440 | } | |
bcfc0821 | 441 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
442 | if (!field->next) |
443 | /* Save vr_die for converting types */ | |
444 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
445 | goto next; | |
446 | } else if (tag == DW_TAG_pointer_type) { | |
447 | /* Check the pointer and dereference */ | |
b55a87ad MH |
448 | if (!field->ref) { |
449 | pr_err("Semantic error: %s must be referred by '->'\n", | |
450 | field->name); | |
451 | return -EINVAL; | |
452 | } | |
7df2f329 | 453 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
454 | if (die_get_real_type(&type, &type) == NULL) { |
455 | pr_warning("Failed to get the type of %s.\n", varname); | |
456 | return -ENOENT; | |
457 | } | |
12e5a7ae | 458 | /* Verify it is a data structure */ |
7b0295b3 HL |
459 | tag = dwarf_tag(&type); |
460 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
461 | pr_warning("%s is not a data structure nor an union.\n", | |
462 | varname); | |
b55a87ad MH |
463 | return -EINVAL; |
464 | } | |
12e5a7ae | 465 | |
0e60836b | 466 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
467 | if (ref == NULL) |
468 | return -ENOMEM; | |
7df2f329 MH |
469 | if (*ref_ptr) |
470 | (*ref_ptr)->next = ref; | |
471 | else | |
472 | *ref_ptr = ref; | |
473 | } else { | |
12e5a7ae | 474 | /* Verify it is a data structure */ |
7b0295b3 HL |
475 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
476 | pr_warning("%s is not a data structure nor an union.\n", | |
477 | varname); | |
b55a87ad MH |
478 | return -EINVAL; |
479 | } | |
b2a3c12b | 480 | if (field->name[0] == '[') { |
d939be3a | 481 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 482 | " nor array.\n", varname); |
b2a3c12b MH |
483 | return -EINVAL; |
484 | } | |
c7273835 MH |
485 | /* While prcessing unnamed field, we don't care about this */ |
486 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
487 | pr_err("Semantic error: %s must be referred by '.'\n", |
488 | field->name); | |
489 | return -EINVAL; | |
490 | } | |
491 | if (!ref) { | |
492 | pr_warning("Structure on a register is not " | |
493 | "supported yet.\n"); | |
494 | return -ENOTSUP; | |
495 | } | |
7df2f329 MH |
496 | } |
497 | ||
b55a87ad | 498 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 499 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
500 | dwarf_diename(&type), field->name); |
501 | return -EINVAL; | |
502 | } | |
7df2f329 MH |
503 | |
504 | /* Get the offset of the field */ | |
7b0295b3 HL |
505 | if (tag == DW_TAG_union_type) { |
506 | offs = 0; | |
507 | } else { | |
508 | ret = die_get_data_member_location(die_mem, &offs); | |
509 | if (ret < 0) { | |
510 | pr_warning("Failed to get the offset of %s.\n", | |
511 | field->name); | |
512 | return ret; | |
513 | } | |
b55a87ad | 514 | } |
7df2f329 MH |
515 | ref->offset += (long)offs; |
516 | ||
c7273835 MH |
517 | /* If this member is unnamed, we need to reuse this field */ |
518 | if (!dwarf_diename(die_mem)) | |
519 | return convert_variable_fields(die_mem, varname, field, | |
520 | &ref, die_mem); | |
521 | ||
b2a3c12b | 522 | next: |
7df2f329 MH |
523 | /* Converting next field */ |
524 | if (field->next) | |
b55a87ad | 525 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 526 | field->next, &ref, die_mem); |
b55a87ad MH |
527 | else |
528 | return 0; | |
7df2f329 MH |
529 | } |
530 | ||
4ea42b18 | 531 | /* Show a variables in kprobe event format */ |
b55a87ad | 532 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 533 | { |
4984912e | 534 | Dwarf_Die die_mem; |
4ea42b18 MH |
535 | int ret; |
536 | ||
b7dcb857 MH |
537 | pr_debug("Converting variable %s into trace event.\n", |
538 | dwarf_diename(vr_die)); | |
804b3606 | 539 | |
cf6eb489 | 540 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
3d918a12 | 541 | &pf->sp_die, pf->tvar); |
7d5eaba9 HK |
542 | if (ret == -ENOENT || ret == -EINVAL) { |
543 | pr_err("Failed to find the location of the '%s' variable at this address.\n" | |
544 | " Perhaps it has been optimized out.\n" | |
545 | " Use -V with the --range option to show '%s' location range.\n", | |
546 | pf->pvar->var, pf->pvar->var); | |
547 | } else if (ret == -ENOTSUP) | |
cf6eb489 | 548 | pr_err("Sorry, we don't support this variable location yet.\n"); |
0c188a07 | 549 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
550 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
551 | pf->pvar->field, &pf->tvar->ref, | |
552 | &die_mem); | |
4984912e MH |
553 | vr_die = &die_mem; |
554 | } | |
73317b95 MH |
555 | if (ret == 0) |
556 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 557 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 558 | return ret; |
4ea42b18 MH |
559 | } |
560 | ||
221d0611 MH |
561 | /* Find a variable in a scope DIE */ |
562 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 563 | { |
f182e3e1 | 564 | Dwarf_Die vr_die; |
909b0360 | 565 | char *buf, *ptr; |
f182e3e1 | 566 | int ret = 0; |
4ea42b18 | 567 | |
da15bd9d WN |
568 | /* Copy raw parameters */ |
569 | if (!is_c_varname(pf->pvar->var)) | |
570 | return copy_to_probe_trace_arg(pf->tvar, pf->pvar); | |
367e94c1 | 571 | |
48481938 | 572 | if (pf->pvar->name) |
02b95dad | 573 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 574 | else { |
909b0360 MH |
575 | buf = synthesize_perf_probe_arg(pf->pvar); |
576 | if (!buf) | |
577 | return -ENOMEM; | |
11a1ca35 MH |
578 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
579 | if (ptr) | |
580 | *ptr = '_'; | |
909b0360 | 581 | pf->tvar->name = buf; |
48481938 | 582 | } |
02b95dad MH |
583 | if (pf->tvar->name == NULL) |
584 | return -ENOMEM; | |
48481938 | 585 | |
f182e3e1 | 586 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 587 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
588 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
589 | /* Search again in global variables */ | |
d13855ef HK |
590 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
591 | 0, &vr_die)) { | |
36d789a4 MH |
592 | pr_warning("Failed to find '%s' in this function.\n", |
593 | pf->pvar->var); | |
f182e3e1 | 594 | ret = -ENOENT; |
d13855ef | 595 | } |
b7dcb857 | 596 | } |
f66fedcb | 597 | if (ret >= 0) |
f182e3e1 MH |
598 | ret = convert_variable(&vr_die, pf); |
599 | ||
b7dcb857 | 600 | return ret; |
4ea42b18 MH |
601 | } |
602 | ||
cf6eb489 | 603 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
604 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
605 | Dwarf_Addr paddr, bool retprobe, | |
6cca13bd | 606 | const char *function, |
576b5237 | 607 | struct probe_trace_point *tp) |
4ea42b18 | 608 | { |
26b79524 | 609 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
610 | GElf_Sym sym; |
611 | const char *symbol; | |
612 | ||
613 | /* Verify the address is correct */ | |
614 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
615 | pr_warning("Failed to get entry address of %s\n", | |
616 | dwarf_diename(sp_die)); | |
617 | return -ENOENT; | |
618 | } | |
619 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
620 | pr_warning("Failed to get end address of %s\n", | |
621 | dwarf_diename(sp_die)); | |
622 | return -ENOENT; | |
623 | } | |
624 | if (paddr > highaddr) { | |
625 | pr_warning("Offset specified is greater than size of %s\n", | |
626 | dwarf_diename(sp_die)); | |
627 | return -EINVAL; | |
628 | } | |
629 | ||
664fee3d | 630 | symbol = dwarf_diename(sp_die); |
576b5237 | 631 | if (!symbol) { |
664fee3d MH |
632 | /* Try to get the symbol name from symtab */ |
633 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
634 | if (!symbol) { | |
635 | pr_warning("Failed to find symbol at 0x%lx\n", | |
636 | (unsigned long)paddr); | |
637 | return -ENOENT; | |
638 | } | |
639 | eaddr = sym.st_value; | |
576b5237 | 640 | } |
664fee3d | 641 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 642 | tp->address = (unsigned long)paddr; |
576b5237 MH |
643 | tp->symbol = strdup(symbol); |
644 | if (!tp->symbol) | |
645 | return -ENOMEM; | |
4235b045 | 646 | |
04ddd04b | 647 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
648 | if (retprobe) { |
649 | if (eaddr != paddr) { | |
6cca13bd MH |
650 | pr_warning("Failed to find \"%s%%return\",\n" |
651 | " because %s is an inlined function and" | |
652 | " has no return point.\n", function, | |
653 | function); | |
04ddd04b MH |
654 | return -EINVAL; |
655 | } | |
cf6eb489 | 656 | tp->retprobe = true; |
04ddd04b MH |
657 | } |
658 | ||
cf6eb489 MH |
659 | return 0; |
660 | } | |
661 | ||
221d0611 MH |
662 | /* Call probe_finder callback with scope DIE */ |
663 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 664 | { |
cf6eb489 | 665 | Dwarf_Attribute fb_attr; |
4d3b1626 | 666 | Dwarf_Frame *frame = NULL; |
cf6eb489 MH |
667 | size_t nops; |
668 | int ret; | |
669 | ||
221d0611 MH |
670 | if (!sc_die) { |
671 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
672 | return -EINVAL; | |
673 | } | |
674 | ||
675 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 676 | if (!die_is_func_def(sc_die)) { |
221d0611 | 677 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
d4c537e6 NR |
678 | if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
679 | pr_warning("Ignoring tail call from %s\n", | |
680 | dwarf_diename(&pf->sp_die)); | |
681 | return 0; | |
682 | } else { | |
683 | pr_warning("Failed to find probe point in any " | |
684 | "functions.\n"); | |
685 | return -ENOENT; | |
686 | } | |
cf6eb489 | 687 | } |
221d0611 MH |
688 | } else |
689 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 690 | |
221d0611 MH |
691 | /* Get the frame base attribute/ops from subprogram */ |
692 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 693 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 694 | if (ret <= 0 || nops == 0) { |
804b3606 | 695 | pf->fb_ops = NULL; |
7752f1b0 | 696 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 697 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
270bde1e HK |
698 | (pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) { |
699 | if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 && | |
700 | (dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) || | |
b55a87ad | 701 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { |
0e43e5d2 | 702 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad | 703 | (uintmax_t)pf->addr); |
4d3b1626 MH |
704 | free(frame); |
705 | return -ENOENT; | |
b55a87ad | 706 | } |
7752f1b0 | 707 | #endif |
a34a9854 | 708 | } |
804b3606 | 709 | |
cf6eb489 | 710 | /* Call finder's callback handler */ |
4d3b1626 | 711 | ret = pf->callback(sc_die, pf); |
804b3606 | 712 | |
4d3b1626 MH |
713 | /* Since *pf->fb_ops can be a part of frame. we should free it here. */ |
714 | free(frame); | |
804b3606 | 715 | pf->fb_ops = NULL; |
cf6eb489 MH |
716 | |
717 | return ret; | |
4ea42b18 MH |
718 | } |
719 | ||
221d0611 MH |
720 | struct find_scope_param { |
721 | const char *function; | |
722 | const char *file; | |
723 | int line; | |
724 | int diff; | |
725 | Dwarf_Die *die_mem; | |
726 | bool found; | |
727 | }; | |
728 | ||
729 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
730 | { | |
731 | struct find_scope_param *fsp = data; | |
732 | const char *file; | |
733 | int lno; | |
734 | ||
735 | /* Skip if declared file name does not match */ | |
736 | if (fsp->file) { | |
737 | file = dwarf_decl_file(fn_die); | |
738 | if (!file || strcmp(fsp->file, file) != 0) | |
739 | return 0; | |
740 | } | |
741 | /* If the function name is given, that's what user expects */ | |
742 | if (fsp->function) { | |
4c859351 | 743 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
744 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
745 | fsp->found = true; | |
746 | return 1; | |
747 | } | |
748 | } else { | |
749 | /* With the line number, find the nearest declared DIE */ | |
750 | dwarf_decl_line(fn_die, &lno); | |
751 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
752 | /* Keep a candidate and continue */ | |
753 | fsp->diff = fsp->line - lno; | |
754 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
755 | fsp->found = true; | |
756 | } | |
757 | } | |
758 | return 0; | |
759 | } | |
760 | ||
761 | /* Find an appropriate scope fits to given conditions */ | |
762 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
763 | { | |
764 | struct find_scope_param fsp = { | |
765 | .function = pf->pev->point.function, | |
766 | .file = pf->fname, | |
767 | .line = pf->lno, | |
768 | .diff = INT_MAX, | |
769 | .die_mem = die_mem, | |
770 | .found = false, | |
771 | }; | |
772 | ||
773 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
774 | ||
775 | return fsp.found ? die_mem : NULL; | |
776 | } | |
777 | ||
4cc9cec6 MH |
778 | static int probe_point_line_walker(const char *fname, int lineno, |
779 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 780 | { |
4cc9cec6 | 781 | struct probe_finder *pf = data; |
221d0611 | 782 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 783 | int ret; |
4ea42b18 | 784 | |
4cc9cec6 MH |
785 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
786 | return 0; | |
4ea42b18 | 787 | |
4cc9cec6 | 788 | pf->addr = addr; |
221d0611 MH |
789 | sc_die = find_best_scope(pf, &die_mem); |
790 | if (!sc_die) { | |
791 | pr_warning("Failed to find scope of probe point.\n"); | |
792 | return -ENOENT; | |
793 | } | |
794 | ||
795 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 796 | |
4cc9cec6 | 797 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 798 | return ret < 0 ? ret : 0; |
4cc9cec6 | 799 | } |
804b3606 | 800 | |
4cc9cec6 MH |
801 | /* Find probe point from its line number */ |
802 | static int find_probe_point_by_line(struct probe_finder *pf) | |
803 | { | |
804 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
805 | } |
806 | ||
2a9c8c36 | 807 | /* Find lines which match lazy pattern */ |
5a62257a | 808 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
809 | const char *fname, const char *pat) |
810 | { | |
f50c2169 FBH |
811 | FILE *fp; |
812 | char *line = NULL; | |
813 | size_t line_len; | |
814 | ssize_t len; | |
815 | int count = 0, linenum = 1; | |
5f03cba4 | 816 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
817 | |
818 | fp = fopen(fname, "r"); | |
819 | if (!fp) { | |
5f03cba4 | 820 | pr_warning("Failed to open %s: %s\n", fname, |
c8b5f2c9 | 821 | str_error_r(errno, sbuf, sizeof(sbuf))); |
b448c4b6 | 822 | return -errno; |
b55a87ad MH |
823 | } |
824 | ||
f50c2169 | 825 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 826 | |
f50c2169 FBH |
827 | if (line[len - 1] == '\n') |
828 | line[len - 1] = '\0'; | |
829 | ||
830 | if (strlazymatch(line, pat)) { | |
5a62257a | 831 | intlist__add(list, linenum); |
f50c2169 | 832 | count++; |
2a9c8c36 | 833 | } |
f50c2169 | 834 | linenum++; |
2a9c8c36 | 835 | } |
f50c2169 FBH |
836 | |
837 | if (ferror(fp)) | |
838 | count = -errno; | |
839 | free(line); | |
840 | fclose(fp); | |
841 | ||
842 | if (count == 0) | |
843 | pr_debug("No matched lines found in %s.\n", fname); | |
844 | return count; | |
2a9c8c36 MH |
845 | } |
846 | ||
4cc9cec6 MH |
847 | static int probe_point_lazy_walker(const char *fname, int lineno, |
848 | Dwarf_Addr addr, void *data) | |
849 | { | |
850 | struct probe_finder *pf = data; | |
221d0611 | 851 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
852 | int ret; |
853 | ||
5a62257a | 854 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
855 | strtailcmp(fname, pf->fname) != 0) |
856 | return 0; | |
857 | ||
858 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
859 | lineno, (unsigned long long)addr); | |
860 | pf->addr = addr; | |
221d0611 MH |
861 | pf->lno = lineno; |
862 | sc_die = find_best_scope(pf, &die_mem); | |
863 | if (!sc_die) { | |
864 | pr_warning("Failed to find scope of probe point.\n"); | |
865 | return -ENOENT; | |
866 | } | |
867 | ||
868 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
869 | |
870 | /* | |
871 | * Continue if no error, because the lazy pattern will match | |
872 | * to other lines | |
873 | */ | |
5e814dd5 | 874 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
875 | } |
876 | ||
2a9c8c36 | 877 | /* Find probe points from lazy pattern */ |
b55a87ad | 878 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 879 | { |
b55a87ad | 880 | int ret = 0; |
09ed8975 | 881 | char *fpath; |
2a9c8c36 | 882 | |
5a62257a | 883 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
884 | const char *comp_dir; |
885 | ||
886 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
887 | ret = get_real_path(pf->fname, comp_dir, &fpath); | |
888 | if (ret < 0) { | |
889 | pr_warning("Failed to find source file path.\n"); | |
890 | return ret; | |
891 | } | |
892 | ||
2a9c8c36 | 893 | /* Matching lazy line pattern */ |
09ed8975 | 894 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 895 | pf->pev->point.lazy_line); |
09ed8975 | 896 | free(fpath); |
f50c2169 | 897 | if (ret <= 0) |
b55a87ad | 898 | return ret; |
2a9c8c36 MH |
899 | } |
900 | ||
4cc9cec6 | 901 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
902 | } |
903 | ||
e92b85e1 MH |
904 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
905 | { | |
db0d2c64 | 906 | struct probe_finder *pf = data; |
4235b045 | 907 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 908 | Dwarf_Addr addr; |
db0d2c64 | 909 | int ret; |
e92b85e1 | 910 | |
2a9c8c36 | 911 | if (pp->lazy_line) |
db0d2c64 | 912 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
913 | else { |
914 | /* Get probe address */ | |
b55a87ad | 915 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 916 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 917 | dwarf_diename(in_die)); |
db0d2c64 | 918 | return -ENOENT; |
b55a87ad MH |
919 | } |
920 | pf->addr = addr; | |
2a9c8c36 MH |
921 | pf->addr += pp->offset; |
922 | pr_debug("found inline addr: 0x%jx\n", | |
923 | (uintmax_t)pf->addr); | |
924 | ||
db0d2c64 | 925 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 926 | } |
e92b85e1 | 927 | |
db0d2c64 | 928 | return ret; |
e92b85e1 | 929 | } |
804b3606 | 930 | |
db0d2c64 MH |
931 | /* Callback parameter with return value for libdw */ |
932 | struct dwarf_callback_param { | |
933 | void *data; | |
934 | int retval; | |
935 | }; | |
936 | ||
4ea42b18 | 937 | /* Search function from function name */ |
e92b85e1 | 938 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 939 | { |
b55a87ad MH |
940 | struct dwarf_callback_param *param = data; |
941 | struct probe_finder *pf = param->data; | |
4235b045 | 942 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 943 | |
e92b85e1 | 944 | /* Check tag and diename */ |
0dbb1cac | 945 | if (!die_is_func_def(sp_die) || |
4c859351 | 946 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 947 | return DWARF_CB_OK; |
e92b85e1 | 948 | |
7d21635a MH |
949 | /* Check declared file */ |
950 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
951 | return DWARF_CB_OK; | |
952 | ||
4c859351 | 953 | pr_debug("Matched function: %s\n", dwarf_diename(sp_die)); |
2a9c8c36 | 954 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 955 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
956 | dwarf_decl_line(sp_die, &pf->lno); |
957 | pf->lno += pp->line; | |
b55a87ad | 958 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
959 | } else if (die_is_func_instance(sp_die)) { |
960 | /* Instances always have the entry address */ | |
961 | dwarf_entrypc(sp_die, &pf->addr); | |
e92b85e1 | 962 | /* Real function */ |
2a9c8c36 | 963 | if (pp->lazy_line) |
b55a87ad | 964 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 965 | else { |
2a9c8c36 MH |
966 | pf->addr += pp->offset; |
967 | /* TODO: Check the address in this function */ | |
cf6eb489 | 968 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 969 | } |
4c859351 | 970 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 971 | /* Inlined function: search instances */ |
db0d2c64 MH |
972 | param->retval = die_walk_instances(sp_die, |
973 | probe_point_inline_cb, (void *)pf); | |
4c859351 MH |
974 | /* This could be a non-existed inline definition */ |
975 | if (param->retval == -ENOENT && strisglob(pp->function)) | |
976 | param->retval = 0; | |
977 | } | |
978 | ||
979 | /* We need to find other candidates */ | |
980 | if (strisglob(pp->function) && param->retval >= 0) { | |
981 | param->retval = 0; /* We have to clear the result */ | |
982 | return DWARF_CB_OK; | |
983 | } | |
e92b85e1 | 984 | |
b55a87ad | 985 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
986 | } |
987 | ||
b55a87ad | 988 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 989 | { |
b55a87ad MH |
990 | struct dwarf_callback_param _param = {.data = (void *)pf, |
991 | .retval = 0}; | |
992 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
993 | return _param.retval; | |
4ea42b18 MH |
994 | } |
995 | ||
cd25f8bc LM |
996 | struct pubname_callback_param { |
997 | char *function; | |
998 | char *file; | |
999 | Dwarf_Die *cu_die; | |
1000 | Dwarf_Die *sp_die; | |
1001 | int found; | |
1002 | }; | |
1003 | ||
1004 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1005 | { | |
1006 | struct pubname_callback_param *param = data; | |
1007 | ||
1008 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1009 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1010 | return DWARF_CB_OK; | |
1011 | ||
4c859351 | 1012 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
1013 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
1014 | return DWARF_CB_OK; | |
1015 | ||
1016 | if (param->file && | |
1017 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1018 | return DWARF_CB_OK; | |
1019 | ||
1020 | param->found = 1; | |
1021 | return DWARF_CB_ABORT; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | return DWARF_CB_OK; | |
1026 | } | |
1027 | ||
270bde1e | 1028 | static int debuginfo__find_probe_location(struct debuginfo *dbg, |
ff741783 | 1029 | struct probe_finder *pf) |
4ea42b18 | 1030 | { |
cf6eb489 | 1031 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1032 | Dwarf_Off off, noff; |
1033 | size_t cuhl; | |
1034 | Dwarf_Die *diep; | |
b55a87ad | 1035 | int ret = 0; |
804b3606 | 1036 | |
804b3606 | 1037 | off = 0; |
5a62257a MH |
1038 | pf->lcache = intlist__new(NULL); |
1039 | if (!pf->lcache) | |
1040 | return -ENOMEM; | |
cd25f8bc LM |
1041 | |
1042 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1043 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1044 | struct pubname_callback_param pubname_param = { |
1045 | .function = pp->function, | |
1046 | .file = pp->file, | |
1047 | .cu_die = &pf->cu_die, | |
1048 | .sp_die = &pf->sp_die, | |
2b348a77 | 1049 | .found = 0, |
cd25f8bc LM |
1050 | }; |
1051 | struct dwarf_callback_param probe_param = { | |
1052 | .data = pf, | |
1053 | }; | |
1054 | ||
316c7136 | 1055 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1056 | &pubname_param, 0); |
cd25f8bc LM |
1057 | if (pubname_param.found) { |
1058 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1059 | if (ret) | |
1060 | goto found; | |
1061 | } | |
1062 | } | |
1063 | ||
804b3606 | 1064 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1065 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1066 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1067 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1068 | if (!diep) |
1069 | continue; | |
4ea42b18 MH |
1070 | |
1071 | /* Check if target file is included. */ | |
1072 | if (pp->file) | |
cf6eb489 | 1073 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1074 | else |
cf6eb489 | 1075 | pf->fname = NULL; |
4ea42b18 | 1076 | |
cf6eb489 | 1077 | if (!pp->file || pf->fname) { |
4ea42b18 | 1078 | if (pp->function) |
cf6eb489 | 1079 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1080 | else if (pp->lazy_line) |
f19e80c6 | 1081 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1082 | else { |
cf6eb489 MH |
1083 | pf->lno = pp->line; |
1084 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1085 | } |
8635bf6e | 1086 | if (ret < 0) |
fbee632d | 1087 | break; |
4ea42b18 | 1088 | } |
804b3606 | 1089 | off = noff; |
4ea42b18 | 1090 | } |
cd25f8bc LM |
1091 | |
1092 | found: | |
5a62257a MH |
1093 | intlist__delete(pf->lcache); |
1094 | pf->lcache = NULL; | |
4ea42b18 | 1095 | |
cf6eb489 MH |
1096 | return ret; |
1097 | } | |
1098 | ||
270bde1e HK |
1099 | /* Find probe points from debuginfo */ |
1100 | static int debuginfo__find_probes(struct debuginfo *dbg, | |
1101 | struct probe_finder *pf) | |
1102 | { | |
1103 | int ret = 0; | |
1104 | ||
1105 | #if _ELFUTILS_PREREQ(0, 142) | |
1106 | Elf *elf; | |
1107 | GElf_Ehdr ehdr; | |
1108 | GElf_Shdr shdr; | |
1109 | ||
1110 | if (pf->cfi_eh || pf->cfi_dbg) | |
1111 | return debuginfo__find_probe_location(dbg, pf); | |
1112 | ||
1113 | /* Get the call frame information from this dwarf */ | |
1114 | elf = dwarf_getelf(dbg->dbg); | |
1115 | if (elf == NULL) | |
1116 | return -EINVAL; | |
1117 | ||
1118 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1119 | return -EINVAL; | |
1120 | ||
1121 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1122 | shdr.sh_type == SHT_PROGBITS) | |
1123 | pf->cfi_eh = dwarf_getcfi_elf(elf); | |
1124 | ||
1125 | pf->cfi_dbg = dwarf_getcfi(dbg->dbg); | |
1126 | #endif | |
1127 | ||
1128 | ret = debuginfo__find_probe_location(dbg, pf); | |
1129 | return ret; | |
1130 | } | |
1131 | ||
7969ec77 MH |
1132 | struct local_vars_finder { |
1133 | struct probe_finder *pf; | |
1134 | struct perf_probe_arg *args; | |
f8bffbf1 | 1135 | bool vars; |
7969ec77 MH |
1136 | int max_args; |
1137 | int nargs; | |
1138 | int ret; | |
1139 | }; | |
1140 | ||
1141 | /* Collect available variables in this scope */ | |
1142 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1143 | { | |
1144 | struct local_vars_finder *vf = data; | |
3d918a12 | 1145 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1146 | int tag; |
1147 | ||
1148 | tag = dwarf_tag(die_mem); | |
1149 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1150 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1151 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 MH |
1152 | vf->pf->fb_ops, &pf->sp_die, |
1153 | NULL) == 0) { | |
7969ec77 MH |
1154 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1155 | if (vf->args[vf->nargs].var == NULL) { | |
1156 | vf->ret = -ENOMEM; | |
1157 | return DIE_FIND_CB_END; | |
1158 | } | |
1159 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1160 | vf->nargs++; | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1165 | return DIE_FIND_CB_CONTINUE; | |
1166 | else | |
1167 | return DIE_FIND_CB_SIBLING; | |
1168 | } | |
1169 | ||
1170 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1171 | struct perf_probe_arg *args) | |
1172 | { | |
1173 | Dwarf_Die die_mem; | |
1174 | int i; | |
1175 | int n = 0; | |
f8bffbf1 | 1176 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1177 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1178 | ||
1179 | for (i = 0; i < pf->pev->nargs; i++) { | |
1180 | /* var never be NULL */ | |
f8bffbf1 MH |
1181 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1182 | vf.vars = true; | |
1183 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1184 | /* Copy normal argument */ |
1185 | args[n] = pf->pev->args[i]; | |
1186 | n++; | |
f8bffbf1 | 1187 | continue; |
7969ec77 | 1188 | } |
f8bffbf1 MH |
1189 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1190 | vf.nargs = n; | |
1191 | /* Special local variables */ | |
1192 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1193 | &die_mem); | |
1194 | pr_debug(" (%d)\n", vf.nargs - n); | |
1195 | if (vf.ret < 0) | |
1196 | return vf.ret; | |
1197 | n = vf.nargs; | |
7969ec77 MH |
1198 | } |
1199 | return n; | |
1200 | } | |
1201 | ||
cf6eb489 | 1202 | /* Add a found probe point into trace event list */ |
221d0611 | 1203 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1204 | { |
1205 | struct trace_event_finder *tf = | |
1206 | container_of(pf, struct trace_event_finder, pf); | |
6cca13bd | 1207 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1208 | struct probe_trace_event *tev; |
092b1f0b | 1209 | struct perf_probe_arg *args = NULL; |
cf6eb489 MH |
1210 | int ret, i; |
1211 | ||
1212 | /* Check number of tevs */ | |
1213 | if (tf->ntevs == tf->max_tevs) { | |
1214 | pr_warning("Too many( > %d) probe point found.\n", | |
1215 | tf->max_tevs); | |
1216 | return -ERANGE; | |
1217 | } | |
1218 | tev = &tf->tevs[tf->ntevs++]; | |
1219 | ||
221d0611 | 1220 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1221 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
6cca13bd | 1222 | pp->retprobe, pp->function, &tev->point); |
cf6eb489 | 1223 | if (ret < 0) |
092b1f0b | 1224 | goto end; |
cf6eb489 | 1225 | |
4c859351 | 1226 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
092b1f0b WN |
1227 | if (!tev->point.realname) { |
1228 | ret = -ENOMEM; | |
1229 | goto end; | |
1230 | } | |
4c859351 | 1231 | |
cf6eb489 MH |
1232 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1233 | tev->point.offset); | |
1234 | ||
7969ec77 MH |
1235 | /* Expand special probe argument if exist */ |
1236 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
092b1f0b WN |
1237 | if (args == NULL) { |
1238 | ret = -ENOMEM; | |
1239 | goto end; | |
1240 | } | |
7969ec77 MH |
1241 | |
1242 | ret = expand_probe_args(sc_die, pf, args); | |
1243 | if (ret < 0) | |
1244 | goto end; | |
1245 | ||
1246 | tev->nargs = ret; | |
1247 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1248 | if (tev->args == NULL) { | |
1249 | ret = -ENOMEM; | |
1250 | goto end; | |
1251 | } | |
1252 | ||
1253 | /* Find each argument */ | |
1254 | for (i = 0; i < tev->nargs; i++) { | |
1255 | pf->pvar = &args[i]; | |
cf6eb489 | 1256 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1257 | /* Variable should be found from scope DIE */ |
1258 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1259 | if (ret != 0) |
7969ec77 | 1260 | break; |
cf6eb489 MH |
1261 | } |
1262 | ||
7969ec77 | 1263 | end: |
092b1f0b WN |
1264 | if (ret) { |
1265 | clear_probe_trace_event(tev); | |
1266 | tf->ntevs--; | |
1267 | } | |
7969ec77 MH |
1268 | free(args); |
1269 | return ret; | |
cf6eb489 MH |
1270 | } |
1271 | ||
1272 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
316c7136 | 1273 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1274 | struct perf_probe_event *pev, |
ddb2f58f | 1275 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1276 | { |
1277 | struct trace_event_finder tf = { | |
1278 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
ddb2f58f | 1279 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
0196e787 | 1280 | int ret, i; |
cf6eb489 MH |
1281 | |
1282 | /* Allocate result tevs array */ | |
ddb2f58f | 1283 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1284 | if (*tevs == NULL) |
1285 | return -ENOMEM; | |
1286 | ||
1287 | tf.tevs = *tevs; | |
1288 | tf.ntevs = 0; | |
1289 | ||
316c7136 | 1290 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cf6eb489 | 1291 | if (ret < 0) { |
0196e787 MH |
1292 | for (i = 0; i < tf.ntevs; i++) |
1293 | clear_probe_trace_event(&tf.tevs[i]); | |
04662523 | 1294 | zfree(tevs); |
cf6eb489 MH |
1295 | return ret; |
1296 | } | |
1297 | ||
1298 | return (ret < 0) ? ret : tf.ntevs; | |
1299 | } | |
1300 | ||
cf6eb489 MH |
1301 | /* Collect available variables in this scope */ |
1302 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1303 | { | |
1304 | struct available_var_finder *af = data; | |
1305 | struct variable_list *vl; | |
bf4d5f25 | 1306 | struct strbuf buf = STRBUF_INIT; |
cf6eb489 MH |
1307 | int tag, ret; |
1308 | ||
1309 | vl = &af->vls[af->nvls - 1]; | |
1310 | ||
1311 | tag = dwarf_tag(die_mem); | |
1312 | if (tag == DW_TAG_formal_parameter || | |
1313 | tag == DW_TAG_variable) { | |
1314 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 MH |
1315 | af->pf.fb_ops, &af->pf.sp_die, |
1316 | NULL); | |
349e8d26 HK |
1317 | if (ret == 0 || ret == -ERANGE) { |
1318 | int ret2; | |
1319 | bool externs = !af->child; | |
fb9596d1 | 1320 | |
bf4d5f25 MH |
1321 | if (strbuf_init(&buf, 64) < 0) |
1322 | goto error; | |
349e8d26 HK |
1323 | |
1324 | if (probe_conf.show_location_range) { | |
bf4d5f25 MH |
1325 | if (!externs) |
1326 | ret2 = strbuf_add(&buf, | |
1327 | ret ? "[INV]\t" : "[VAL]\t", 6); | |
1328 | else | |
1329 | ret2 = strbuf_add(&buf, "[EXT]\t", 6); | |
1330 | if (ret2) | |
1331 | goto error; | |
349e8d26 HK |
1332 | } |
1333 | ||
1334 | ret2 = die_get_varname(die_mem, &buf); | |
1335 | ||
1336 | if (!ret2 && probe_conf.show_location_range && | |
1337 | !externs) { | |
bf4d5f25 MH |
1338 | if (strbuf_addch(&buf, '\t') < 0) |
1339 | goto error; | |
349e8d26 HK |
1340 | ret2 = die_get_var_range(&af->pf.sp_die, |
1341 | die_mem, &buf); | |
1342 | } | |
1343 | ||
1344 | pr_debug("Add new var: %s\n", buf.buf); | |
1345 | if (ret2 == 0) { | |
fb9596d1 HK |
1346 | strlist__add(vl->vars, |
1347 | strbuf_detach(&buf, NULL)); | |
bf4d5f25 MH |
1348 | } |
1349 | strbuf_release(&buf); | |
cf6eb489 MH |
1350 | } |
1351 | } | |
1352 | ||
fb8c5a56 | 1353 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1354 | return DIE_FIND_CB_CONTINUE; |
1355 | else | |
1356 | return DIE_FIND_CB_SIBLING; | |
bf4d5f25 MH |
1357 | error: |
1358 | strbuf_release(&buf); | |
1359 | pr_debug("Error in strbuf\n"); | |
1360 | return DIE_FIND_CB_END; | |
cf6eb489 MH |
1361 | } |
1362 | ||
1363 | /* Add a found vars into available variables list */ | |
221d0611 | 1364 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1365 | { |
1366 | struct available_var_finder *af = | |
1367 | container_of(pf, struct available_var_finder, pf); | |
6cca13bd | 1368 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1369 | struct variable_list *vl; |
f182e3e1 MH |
1370 | Dwarf_Die die_mem; |
1371 | int ret; | |
cf6eb489 MH |
1372 | |
1373 | /* Check number of tevs */ | |
1374 | if (af->nvls == af->max_vls) { | |
1375 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1376 | return -ERANGE; | |
1377 | } | |
1378 | vl = &af->vls[af->nvls++]; | |
1379 | ||
221d0611 | 1380 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1381 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
6cca13bd | 1382 | pp->retprobe, pp->function, &vl->point); |
cf6eb489 MH |
1383 | if (ret < 0) |
1384 | return ret; | |
1385 | ||
1386 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1387 | vl->point.offset); | |
1388 | ||
1389 | /* Find local variables */ | |
4a77e218 | 1390 | vl->vars = strlist__new(NULL, NULL); |
cf6eb489 MH |
1391 | if (vl->vars == NULL) |
1392 | return -ENOMEM; | |
fb8c5a56 | 1393 | af->child = true; |
221d0611 | 1394 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1395 | |
fb8c5a56 | 1396 | /* Find external variables */ |
ddb2f58f | 1397 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1398 | goto out; |
ddb2f58f | 1399 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1400 | af->child = false; |
f182e3e1 | 1401 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1402 | |
1403 | out: | |
cf6eb489 MH |
1404 | if (strlist__empty(vl->vars)) { |
1405 | strlist__delete(vl->vars); | |
1406 | vl->vars = NULL; | |
1407 | } | |
1408 | ||
1409 | return ret; | |
1410 | } | |
1411 | ||
69e96eaa MH |
1412 | /* |
1413 | * Find available variables at given probe point | |
1414 | * Return the number of found probe points. Return 0 if there is no | |
1415 | * matched probe point. Return <0 if an error occurs. | |
1416 | */ | |
316c7136 | 1417 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1418 | struct perf_probe_event *pev, |
ddb2f58f | 1419 | struct variable_list **vls) |
cf6eb489 MH |
1420 | { |
1421 | struct available_var_finder af = { | |
1422 | .pf = {.pev = pev, .callback = add_available_vars}, | |
316c7136 | 1423 | .mod = dbg->mod, |
ddb2f58f | 1424 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1425 | int ret; |
1426 | ||
1427 | /* Allocate result vls array */ | |
ddb2f58f | 1428 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1429 | if (*vls == NULL) |
1430 | return -ENOMEM; | |
1431 | ||
1432 | af.vls = *vls; | |
1433 | af.nvls = 0; | |
1434 | ||
316c7136 | 1435 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1436 | if (ret < 0) { |
1437 | /* Free vlist for error */ | |
1438 | while (af.nvls--) { | |
74cf249d | 1439 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1440 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1441 | } |
04662523 | 1442 | zfree(vls); |
cf6eb489 MH |
1443 | return ret; |
1444 | } | |
1445 | ||
1446 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1447 | } |
1448 | ||
9b239a12 MH |
1449 | /* For the kernel module, we need a special code to get a DIE */ |
1450 | static int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs) | |
1451 | { | |
1452 | int n, i; | |
1453 | Elf32_Word shndx; | |
1454 | Elf_Scn *scn; | |
1455 | Elf *elf; | |
1456 | GElf_Shdr mem, *shdr; | |
1457 | const char *p; | |
1458 | ||
1459 | elf = dwfl_module_getelf(dbg->mod, &dbg->bias); | |
1460 | if (!elf) | |
1461 | return -EINVAL; | |
1462 | ||
1463 | /* Get the number of relocations */ | |
1464 | n = dwfl_module_relocations(dbg->mod); | |
1465 | if (n < 0) | |
1466 | return -ENOENT; | |
1467 | /* Search the relocation related .text section */ | |
1468 | for (i = 0; i < n; i++) { | |
1469 | p = dwfl_module_relocation_info(dbg->mod, i, &shndx); | |
1470 | if (strcmp(p, ".text") == 0) { | |
1471 | /* OK, get the section header */ | |
1472 | scn = elf_getscn(elf, shndx); | |
1473 | if (!scn) | |
1474 | return -ENOENT; | |
1475 | shdr = gelf_getshdr(scn, &mem); | |
1476 | if (!shdr) | |
1477 | return -ENOENT; | |
1478 | *offs = shdr->sh_addr; | |
1479 | } | |
1480 | } | |
1481 | return 0; | |
1482 | } | |
1483 | ||
fb1587d8 | 1484 | /* Reverse search */ |
316c7136 | 1485 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1486 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1487 | { |
1488 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1489 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1490 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1491 | int baseline = 0, lineno = 0, ret = 0; |
9b239a12 | 1492 | bool reloc = false; |
fb1587d8 | 1493 | |
9b239a12 | 1494 | retry: |
fb1587d8 | 1495 | /* Find cu die */ |
0104fe69 | 1496 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
9b239a12 MH |
1497 | if (!reloc && debuginfo__get_text_offset(dbg, &baseaddr) == 0) { |
1498 | addr += baseaddr; | |
1499 | reloc = true; | |
1500 | goto retry; | |
1501 | } | |
0e43e5d2 MH |
1502 | pr_warning("Failed to find debug information for address %lx\n", |
1503 | addr); | |
75ec5a24 MH |
1504 | ret = -EINVAL; |
1505 | goto end; | |
1506 | } | |
fb1587d8 | 1507 | |
1d46ea2a MH |
1508 | /* Find a corresponding line (filename and lineno) */ |
1509 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1510 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1511 | |
1d46ea2a | 1512 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1513 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1514 | /* Get function entry information */ |
e08cfd4b MH |
1515 | func = basefunc = dwarf_diename(&spdie); |
1516 | if (!func || | |
1d46ea2a | 1517 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1518 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1519 | lineno = 0; | |
1d46ea2a | 1520 | goto post; |
e08cfd4b | 1521 | } |
1d46ea2a | 1522 | |
1b286bdd | 1523 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1524 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1525 | /* Function entry - Relative line number is 0 */ |
1526 | lineno = baseline; | |
e08cfd4b MH |
1527 | goto post; |
1528 | } | |
1529 | ||
1530 | /* Track down the inline functions step by step */ | |
1531 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1532 | &indie)) { | |
1533 | /* There is an inline function */ | |
1d46ea2a | 1534 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1535 | _addr == addr) { |
1d46ea2a MH |
1536 | /* |
1537 | * addr is at an inline function entry. | |
1538 | * In this case, lineno should be the call-site | |
e08cfd4b | 1539 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1540 | */ |
1541 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1542 | fname = die_get_call_file(&indie); |
1543 | break; | |
1544 | } else { | |
1d46ea2a MH |
1545 | /* |
1546 | * addr is in an inline function body. | |
1547 | * Since lineno points one of the lines | |
1548 | * of the inline function, baseline should | |
1549 | * be the entry line of the inline function. | |
1550 | */ | |
b55a87ad | 1551 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1552 | if (!tmp || |
1553 | dwarf_decl_line(&indie, &baseline) != 0) | |
1554 | break; | |
1555 | func = tmp; | |
1556 | spdie = indie; | |
b55a87ad | 1557 | } |
fb1587d8 | 1558 | } |
e08cfd4b MH |
1559 | /* Verify the lineno and baseline are in a same file */ |
1560 | tmp = dwarf_decl_file(&spdie); | |
1561 | if (!tmp || strcmp(tmp, fname) != 0) | |
1562 | lineno = 0; | |
1d46ea2a MH |
1563 | } |
1564 | ||
1565 | post: | |
1566 | /* Make a relative line number or an offset */ | |
1567 | if (lineno) | |
1568 | ppt->line = lineno - baseline; | |
e08cfd4b | 1569 | else if (basefunc) { |
1d46ea2a | 1570 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1571 | func = basefunc; |
1572 | } | |
1d46ea2a MH |
1573 | |
1574 | /* Duplicate strings */ | |
1575 | if (func) { | |
1576 | ppt->function = strdup(func); | |
02b95dad MH |
1577 | if (ppt->function == NULL) { |
1578 | ret = -ENOMEM; | |
1579 | goto end; | |
1580 | } | |
fb1587d8 | 1581 | } |
1d46ea2a MH |
1582 | if (fname) { |
1583 | ppt->file = strdup(fname); | |
1584 | if (ppt->file == NULL) { | |
04662523 | 1585 | zfree(&ppt->function); |
1d46ea2a MH |
1586 | ret = -ENOMEM; |
1587 | goto end; | |
1588 | } | |
1589 | } | |
fb1587d8 | 1590 | end: |
1d46ea2a MH |
1591 | if (ret == 0 && (fname || func)) |
1592 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1593 | return ret; |
1594 | } | |
1595 | ||
f6c903f5 MH |
1596 | /* Add a line and store the src path */ |
1597 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1598 | struct line_range *lr) | |
1599 | { | |
7cf0b79e | 1600 | /* Copy source path */ |
f6c903f5 | 1601 | if (!lr->path) { |
7cf0b79e MH |
1602 | lr->path = strdup(src); |
1603 | if (lr->path == NULL) | |
1604 | return -ENOMEM; | |
f6c903f5 | 1605 | } |
5a62257a | 1606 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1607 | } |
1608 | ||
4cc9cec6 | 1609 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1610 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1611 | void *data) |
f6c903f5 | 1612 | { |
4cc9cec6 | 1613 | struct line_finder *lf = data; |
202c7c12 | 1614 | int err; |
f6c903f5 | 1615 | |
4cc9cec6 | 1616 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1617 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1618 | return 0; |
f6c903f5 | 1619 | |
202c7c12 NK |
1620 | err = line_range_add_line(fname, lineno, lf->lr); |
1621 | if (err < 0 && err != -EEXIST) | |
1622 | return err; | |
f6c903f5 | 1623 | |
4cc9cec6 | 1624 | return 0; |
f6c903f5 | 1625 | } |
fb1587d8 | 1626 | |
631c9def | 1627 | /* Find line range from its line number */ |
b55a87ad | 1628 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1629 | { |
4cc9cec6 | 1630 | int ret; |
f6c903f5 | 1631 | |
4cc9cec6 | 1632 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1633 | |
804b3606 | 1634 | /* Update status */ |
f6c903f5 | 1635 | if (ret >= 0) |
5a62257a | 1636 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1637 | ret = lf->found = 1; |
1638 | else | |
1639 | ret = 0; /* Lines are not found */ | |
804b3606 | 1640 | else { |
04662523 | 1641 | zfree(&lf->lr->path); |
804b3606 | 1642 | } |
f6c903f5 | 1643 | return ret; |
631c9def MH |
1644 | } |
1645 | ||
161a26b0 MH |
1646 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1647 | { | |
182c228e | 1648 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1649 | |
1650 | /* | |
1651 | * We have to check all instances of inlined function, because | |
1652 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1653 | * function argument of instances. However, if an error occurs, |
1654 | * it should be handled by the caller. | |
36c0c588 | 1655 | */ |
182c228e | 1656 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1657 | } |
1658 | ||
0dbb1cac | 1659 | /* Search function definition from function name */ |
e92b85e1 | 1660 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1661 | { |
b55a87ad MH |
1662 | struct dwarf_callback_param *param = data; |
1663 | struct line_finder *lf = param->data; | |
631c9def | 1664 | struct line_range *lr = lf->lr; |
631c9def | 1665 | |
7d21635a MH |
1666 | /* Check declared file */ |
1667 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1668 | return DWARF_CB_OK; | |
1669 | ||
0dbb1cac | 1670 | if (die_is_func_def(sp_die) && |
4c859351 | 1671 | die_match_name(sp_die, lr->function)) { |
e92b85e1 MH |
1672 | lf->fname = dwarf_decl_file(sp_die); |
1673 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1674 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1675 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1676 | if (lf->lno_s < 0) /* Overflow */ |
1677 | lf->lno_s = INT_MAX; | |
1678 | lf->lno_e = lr->offset + lr->end; | |
1679 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1680 | lf->lno_e = INT_MAX; |
d3b63d7a | 1681 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1682 | lr->start = lf->lno_s; |
1683 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1684 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1685 | param->retval = die_walk_instances(sp_die, |
1686 | line_range_inline_cb, lf); | |
1687 | else | |
b55a87ad MH |
1688 | param->retval = find_line_range_by_line(sp_die, lf); |
1689 | return DWARF_CB_ABORT; | |
631c9def | 1690 | } |
b55a87ad | 1691 | return DWARF_CB_OK; |
631c9def MH |
1692 | } |
1693 | ||
b55a87ad | 1694 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1695 | { |
b55a87ad MH |
1696 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1697 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1698 | return param.retval; | |
631c9def MH |
1699 | } |
1700 | ||
316c7136 | 1701 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1702 | { |
804b3606 | 1703 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1704 | int ret = 0; |
804b3606 MH |
1705 | Dwarf_Off off = 0, noff; |
1706 | size_t cuhl; | |
1707 | Dwarf_Die *diep; | |
6a330a3c | 1708 | const char *comp_dir; |
804b3606 | 1709 | |
cd25f8bc LM |
1710 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1711 | if (lr->function) { | |
1712 | struct pubname_callback_param pubname_param = { | |
1713 | .function = lr->function, .file = lr->file, | |
1714 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1715 | struct dwarf_callback_param line_range_param = { | |
1716 | .data = (void *)&lf, .retval = 0}; | |
1717 | ||
316c7136 | 1718 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1719 | &pubname_param, 0); |
cd25f8bc LM |
1720 | if (pubname_param.found) { |
1721 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1722 | if (lf.found) | |
1723 | goto found; | |
1724 | } | |
1725 | } | |
1726 | ||
804b3606 | 1727 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1728 | while (!lf.found && ret >= 0) { |
316c7136 | 1729 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1730 | NULL, NULL, NULL) != 0) |
631c9def MH |
1731 | break; |
1732 | ||
1733 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1734 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1735 | if (!diep) |
1736 | continue; | |
631c9def MH |
1737 | |
1738 | /* Check if target file is included. */ | |
1739 | if (lr->file) | |
2a9c8c36 | 1740 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1741 | else |
2a9c8c36 | 1742 | lf.fname = 0; |
631c9def | 1743 | |
2a9c8c36 | 1744 | if (!lr->file || lf.fname) { |
631c9def | 1745 | if (lr->function) |
b55a87ad | 1746 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1747 | else { |
1748 | lf.lno_s = lr->start; | |
d3b63d7a | 1749 | lf.lno_e = lr->end; |
b55a87ad | 1750 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1751 | } |
631c9def | 1752 | } |
804b3606 | 1753 | off = noff; |
631c9def | 1754 | } |
6a330a3c | 1755 | |
cd25f8bc | 1756 | found: |
6a330a3c MH |
1757 | /* Store comp_dir */ |
1758 | if (lf.found) { | |
1759 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1760 | if (comp_dir) { | |
1761 | lr->comp_dir = strdup(comp_dir); | |
1762 | if (!lr->comp_dir) | |
1763 | ret = -ENOMEM; | |
1764 | } | |
1765 | } | |
1766 | ||
7cf0b79e | 1767 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1768 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1769 | } |
1770 | ||
09ed8975 NA |
1771 | /* |
1772 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
1773 | * and chop off leading directories that do not exist. Result is passed back as | |
1774 | * a newly allocated path on success. | |
1775 | * Return 0 if file was found and readable, -errno otherwise. | |
1776 | */ | |
1777 | int get_real_path(const char *raw_path, const char *comp_dir, | |
1778 | char **new_path) | |
1779 | { | |
1780 | const char *prefix = symbol_conf.source_prefix; | |
1781 | ||
1782 | if (!prefix) { | |
1783 | if (raw_path[0] != '/' && comp_dir) | |
1784 | /* If not an absolute path, try to use comp_dir */ | |
1785 | prefix = comp_dir; | |
1786 | else { | |
1787 | if (access(raw_path, R_OK) == 0) { | |
1788 | *new_path = strdup(raw_path); | |
1789 | return *new_path ? 0 : -ENOMEM; | |
1790 | } else | |
1791 | return -errno; | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
1796 | if (!*new_path) | |
1797 | return -ENOMEM; | |
1798 | ||
1799 | for (;;) { | |
1800 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
1801 | ||
1802 | if (access(*new_path, R_OK) == 0) | |
1803 | return 0; | |
1804 | ||
1805 | if (!symbol_conf.source_prefix) { | |
1806 | /* In case of searching comp_dir, don't retry */ | |
1807 | zfree(new_path); | |
1808 | return -errno; | |
1809 | } | |
1810 | ||
1811 | switch (errno) { | |
1812 | case ENAMETOOLONG: | |
1813 | case ENOENT: | |
1814 | case EROFS: | |
1815 | case EFAULT: | |
1816 | raw_path = strchr(++raw_path, '/'); | |
1817 | if (!raw_path) { | |
1818 | zfree(new_path); | |
1819 | return -ENOENT; | |
1820 | } | |
1821 | continue; | |
1822 | ||
1823 | default: | |
1824 | zfree(new_path); | |
1825 | return -errno; | |
1826 | } | |
1827 | } | |
1828 | } |