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 | 41 | #include "probe-finder.h" |
180b2061 | 42 | #include "probe-file.h" |
4ea42b18 | 43 | |
4984912e MH |
44 | /* Kprobe tracer basic type is up to u64 */ |
45 | #define MAX_BASIC_TYPE_BITS 64 | |
46 | ||
469b9b88 | 47 | /* Dwarf FL wrappers */ |
469b9b88 MH |
48 | static char *debuginfo_path; /* Currently dummy */ |
49 | ||
50 | static const Dwfl_Callbacks offline_callbacks = { | |
51 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
52 | .debuginfo_path = &debuginfo_path, | |
53 | ||
54 | .section_address = dwfl_offline_section_address, | |
55 | ||
56 | /* We use this table for core files too. */ | |
57 | .find_elf = dwfl_build_id_find_elf, | |
58 | }; | |
59 | ||
469b9b88 | 60 | /* Get a Dwarf from offline image */ |
316c7136 | 61 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
ff741783 | 62 | const char *path) |
469b9b88 | 63 | { |
ff741783 | 64 | int fd; |
469b9b88 | 65 | |
ff741783 MH |
66 | fd = open(path, O_RDONLY); |
67 | if (fd < 0) | |
68 | return fd; | |
469b9b88 | 69 | |
316c7136 ACM |
70 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
71 | if (!dbg->dwfl) | |
ff741783 | 72 | goto error; |
469b9b88 | 73 | |
9135949d | 74 | dwfl_report_begin(dbg->dwfl); |
316c7136 ACM |
75 | dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd); |
76 | if (!dbg->mod) | |
469b9b88 MH |
77 | goto error; |
78 | ||
316c7136 ACM |
79 | dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias); |
80 | if (!dbg->dbg) | |
ff741783 MH |
81 | goto error; |
82 | ||
9135949d MH |
83 | dwfl_report_end(dbg->dwfl, NULL, NULL); |
84 | ||
ff741783 | 85 | return 0; |
469b9b88 | 86 | error: |
316c7136 ACM |
87 | if (dbg->dwfl) |
88 | dwfl_end(dbg->dwfl); | |
ff741783 MH |
89 | else |
90 | close(fd); | |
316c7136 | 91 | memset(dbg, 0, sizeof(*dbg)); |
ff741783 MH |
92 | |
93 | return -ENOENT; | |
469b9b88 MH |
94 | } |
95 | ||
a15ad2f5 | 96 | static struct debuginfo *__debuginfo__new(const char *path) |
ff741783 | 97 | { |
316c7136 ACM |
98 | struct debuginfo *dbg = zalloc(sizeof(*dbg)); |
99 | if (!dbg) | |
3b4694de MH |
100 | return NULL; |
101 | ||
04662523 ACM |
102 | if (debuginfo__init_offline_dwarf(dbg, path) < 0) |
103 | zfree(&dbg); | |
a15ad2f5 MH |
104 | if (dbg) |
105 | pr_debug("Open Debuginfo file: %s\n", path); | |
316c7136 | 106 | return dbg; |
ff741783 MH |
107 | } |
108 | ||
a15ad2f5 MH |
109 | enum dso_binary_type distro_dwarf_types[] = { |
110 | DSO_BINARY_TYPE__FEDORA_DEBUGINFO, | |
111 | DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, | |
112 | DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, | |
113 | DSO_BINARY_TYPE__BUILDID_DEBUGINFO, | |
114 | DSO_BINARY_TYPE__NOT_FOUND, | |
115 | }; | |
116 | ||
117 | struct debuginfo *debuginfo__new(const char *path) | |
118 | { | |
119 | enum dso_binary_type *type; | |
120 | char buf[PATH_MAX], nil = '\0'; | |
121 | struct dso *dso; | |
122 | struct debuginfo *dinfo = NULL; | |
123 | ||
124 | /* Try to open distro debuginfo files */ | |
125 | dso = dso__new(path); | |
126 | if (!dso) | |
127 | goto out; | |
128 | ||
129 | for (type = distro_dwarf_types; | |
130 | !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; | |
131 | type++) { | |
132 | if (dso__read_binary_type_filename(dso, *type, &nil, | |
133 | buf, PATH_MAX) < 0) | |
134 | continue; | |
135 | dinfo = __debuginfo__new(buf); | |
136 | } | |
d3a7c489 | 137 | dso__put(dso); |
a15ad2f5 MH |
138 | |
139 | out: | |
140 | /* if failed to open all distro debuginfo, open given binary */ | |
141 | return dinfo ? : __debuginfo__new(path); | |
142 | } | |
143 | ||
316c7136 | 144 | void debuginfo__delete(struct debuginfo *dbg) |
ff741783 | 145 | { |
316c7136 ACM |
146 | if (dbg) { |
147 | if (dbg->dwfl) | |
148 | dwfl_end(dbg->dwfl); | |
149 | free(dbg); | |
ff741783 | 150 | } |
3b4694de | 151 | } |
469b9b88 | 152 | |
4ea42b18 MH |
153 | /* |
154 | * Probe finder related functions | |
155 | */ | |
156 | ||
0e60836b | 157 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 158 | { |
0e60836b SD |
159 | struct probe_trace_arg_ref *ref; |
160 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
161 | if (ref != NULL) |
162 | ref->offset = offs; | |
163 | return ref; | |
164 | } | |
165 | ||
cf6eb489 MH |
166 | /* |
167 | * Convert a location into trace_arg. | |
168 | * If tvar == NULL, this just checks variable can be converted. | |
3d918a12 MH |
169 | * If fentry == true and vr_die is a parameter, do huristic search |
170 | * for the location fuzzed by function entry mcount. | |
cf6eb489 MH |
171 | */ |
172 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
3d918a12 | 173 | Dwarf_Op *fb_ops, Dwarf_Die *sp_die, |
293d5b43 | 174 | unsigned int machine, |
cf6eb489 | 175 | struct probe_trace_arg *tvar) |
4ea42b18 | 176 | { |
b7dcb857 | 177 | Dwarf_Attribute attr; |
3d918a12 | 178 | Dwarf_Addr tmp = 0; |
b7dcb857 MH |
179 | Dwarf_Op *op; |
180 | size_t nops; | |
804b3606 MH |
181 | unsigned int regn; |
182 | Dwarf_Word offs = 0; | |
4235b045 | 183 | bool ref = false; |
4ea42b18 | 184 | const char *regs; |
349e8d26 | 185 | int ret, ret2 = 0; |
b7dcb857 | 186 | |
632941c4 MH |
187 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
188 | goto static_var; | |
189 | ||
b7dcb857 | 190 | /* TODO: handle more than 1 exprs */ |
3d918a12 MH |
191 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
192 | return -EINVAL; /* Broken DIE ? */ | |
193 | if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) { | |
194 | ret = dwarf_entrypc(sp_die, &tmp); | |
349e8d26 HK |
195 | if (ret) |
196 | return -ENOENT; | |
197 | ||
198 | if (probe_conf.show_location_range && | |
199 | (dwarf_tag(vr_die) == DW_TAG_variable)) { | |
200 | ret2 = -ERANGE; | |
201 | } else if (addr != tmp || | |
202 | dwarf_tag(vr_die) != DW_TAG_formal_parameter) { | |
203 | return -ENOENT; | |
204 | } | |
205 | ||
206 | ret = dwarf_highpc(sp_die, &tmp); | |
207 | if (ret) | |
3d918a12 MH |
208 | return -ENOENT; |
209 | /* | |
210 | * This is fuzzed by fentry mcount. We try to find the | |
211 | * parameter location at the earliest address. | |
212 | */ | |
213 | for (addr += 1; addr <= tmp; addr++) { | |
214 | if (dwarf_getlocation_addr(&attr, addr, &op, | |
215 | &nops, 1) > 0) | |
216 | goto found; | |
217 | } | |
b7dcb857 MH |
218 | return -ENOENT; |
219 | } | |
3d918a12 MH |
220 | found: |
221 | if (nops == 0) | |
222 | /* TODO: Support const_value */ | |
223 | return -ENOENT; | |
b7dcb857 MH |
224 | |
225 | if (op->atom == DW_OP_addr) { | |
632941c4 | 226 | static_var: |
cf6eb489 | 227 | if (!tvar) |
349e8d26 | 228 | return ret2; |
b7dcb857 MH |
229 | /* Static variables on memory (not stack), make @varname */ |
230 | ret = strlen(dwarf_diename(vr_die)); | |
231 | tvar->value = zalloc(ret + 2); | |
232 | if (tvar->value == NULL) | |
233 | return -ENOMEM; | |
234 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
235 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
236 | if (tvar->ref == NULL) | |
237 | return -ENOMEM; | |
349e8d26 | 238 | return ret2; |
b7dcb857 | 239 | } |
4ea42b18 | 240 | |
4ea42b18 | 241 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 242 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 243 | if (fb_ops == NULL) |
b55a87ad | 244 | return -ENOTSUP; |
4235b045 | 245 | ref = true; |
804b3606 | 246 | offs = op->number; |
cf6eb489 | 247 | op = &fb_ops[0]; |
804b3606 | 248 | } |
4ea42b18 | 249 | |
804b3606 MH |
250 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
251 | regn = op->atom - DW_OP_breg0; | |
252 | offs += op->number; | |
4235b045 | 253 | ref = true; |
804b3606 MH |
254 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
255 | regn = op->atom - DW_OP_reg0; | |
256 | } else if (op->atom == DW_OP_bregx) { | |
257 | regn = op->number; | |
258 | offs += op->number2; | |
4235b045 | 259 | ref = true; |
804b3606 MH |
260 | } else if (op->atom == DW_OP_regx) { |
261 | regn = op->number; | |
b55a87ad | 262 | } else { |
cf6eb489 | 263 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
264 | return -ENOTSUP; |
265 | } | |
4ea42b18 | 266 | |
cf6eb489 | 267 | if (!tvar) |
349e8d26 | 268 | return ret2; |
cf6eb489 | 269 | |
293d5b43 | 270 | regs = get_dwarf_regstr(regn, machine); |
b55a87ad | 271 | if (!regs) { |
cf6eb489 | 272 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
273 | pr_warning("Mapping for the register number %u " |
274 | "missing on this architecture.\n", regn); | |
349e8d26 | 275 | return -ENOTSUP; |
b55a87ad | 276 | } |
4ea42b18 | 277 | |
02b95dad MH |
278 | tvar->value = strdup(regs); |
279 | if (tvar->value == NULL) | |
280 | return -ENOMEM; | |
281 | ||
4235b045 | 282 | if (ref) { |
b7dcb857 | 283 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
284 | if (tvar->ref == NULL) |
285 | return -ENOMEM; | |
4235b045 | 286 | } |
349e8d26 | 287 | return ret2; |
4ea42b18 MH |
288 | } |
289 | ||
124bb83c MH |
290 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
291 | ||
b55a87ad | 292 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 293 | struct probe_trace_arg *tvar, |
73317b95 | 294 | const char *cast) |
4984912e | 295 | { |
0e60836b | 296 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
297 | Dwarf_Die type; |
298 | char buf[16]; | |
5f03cba4 | 299 | char sbuf[STRERR_BUFSIZE]; |
bcfc0821 | 300 | int bsize, boffs, total; |
4984912e | 301 | int ret; |
92543787 | 302 | char prefix; |
4984912e | 303 | |
73317b95 | 304 | /* TODO: check all types */ |
92543787 | 305 | if (cast && strcmp(cast, "string") != 0 && strcmp(cast, "x") != 0 && |
19f00b01 | 306 | strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) { |
73317b95 | 307 | /* Non string type is OK */ |
92543787 | 308 | /* and respect signedness/hexadecimal cast */ |
73317b95 MH |
309 | tvar->type = strdup(cast); |
310 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
311 | } | |
312 | ||
bcfc0821 MH |
313 | bsize = dwarf_bitsize(vr_die); |
314 | if (bsize > 0) { | |
124bb83c | 315 | /* This is a bitfield */ |
bcfc0821 MH |
316 | boffs = dwarf_bitoffset(vr_die); |
317 | total = dwarf_bytesize(vr_die); | |
318 | if (boffs < 0 || total < 0) | |
319 | return -ENOENT; | |
320 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
321 | BYTES_TO_BITS(total)); | |
124bb83c MH |
322 | goto formatted; |
323 | } | |
324 | ||
b55a87ad MH |
325 | if (die_get_real_type(vr_die, &type) == NULL) { |
326 | pr_warning("Failed to get a type information of %s.\n", | |
327 | dwarf_diename(vr_die)); | |
328 | return -ENOENT; | |
329 | } | |
4984912e | 330 | |
b2a3c12b MH |
331 | pr_debug("%s type is %s.\n", |
332 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
333 | ||
73317b95 MH |
334 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
335 | ret = dwarf_tag(&type); | |
336 | if (ret != DW_TAG_pointer_type && | |
337 | ret != DW_TAG_array_type) { | |
338 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 339 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
340 | dwarf_diename(vr_die), dwarf_diename(&type)); |
341 | return -EINVAL; | |
342 | } | |
7ce28b5b HL |
343 | if (die_get_real_type(&type, &type) == NULL) { |
344 | pr_warning("Failed to get a type" | |
345 | " information.\n"); | |
346 | return -ENOENT; | |
347 | } | |
73317b95 | 348 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
349 | while (*ref_ptr) |
350 | ref_ptr = &(*ref_ptr)->next; | |
351 | /* Add new reference with offset +0 */ | |
0e60836b | 352 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
353 | if (*ref_ptr == NULL) { |
354 | pr_warning("Out of memory error\n"); | |
355 | return -ENOMEM; | |
356 | } | |
357 | } | |
82175633 MH |
358 | if (!die_compare_name(&type, "char") && |
359 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 360 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 361 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
362 | dwarf_diename(vr_die)); |
363 | return -EINVAL; | |
364 | } | |
365 | tvar->type = strdup(cast); | |
366 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
367 | } | |
368 | ||
19f00b01 | 369 | if (cast && (strcmp(cast, "u") == 0)) |
92543787 | 370 | prefix = 'u'; |
19f00b01 | 371 | else if (cast && (strcmp(cast, "s") == 0)) |
92543787 MH |
372 | prefix = 's'; |
373 | else if (cast && (strcmp(cast, "x") == 0) && | |
374 | probe_type_is_available(PROBE_TYPE_X)) | |
375 | prefix = 'x'; | |
19f00b01 | 376 | else |
9880ce4a MH |
377 | prefix = die_is_signed_type(&type) ? 's' : |
378 | probe_type_is_available(PROBE_TYPE_X) ? 'x' : 'u'; | |
19f00b01 | 379 | |
bcfc0821 MH |
380 | ret = dwarf_bytesize(&type); |
381 | if (ret <= 0) | |
124bb83c MH |
382 | /* No size ... try to use default type */ |
383 | return 0; | |
bcfc0821 | 384 | ret = BYTES_TO_BITS(ret); |
4984912e | 385 | |
124bb83c MH |
386 | /* Check the bitwidth */ |
387 | if (ret > MAX_BASIC_TYPE_BITS) { | |
388 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
389 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
390 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 391 | } |
92543787 | 392 | ret = snprintf(buf, 16, "%c%d", prefix, ret); |
124bb83c MH |
393 | |
394 | formatted: | |
395 | if (ret < 0 || ret >= 16) { | |
396 | if (ret >= 16) | |
397 | ret = -E2BIG; | |
398 | pr_warning("Failed to convert variable type: %s\n", | |
c8b5f2c9 | 399 | str_error_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
400 | return ret; |
401 | } | |
402 | tvar->type = strdup(buf); | |
403 | if (tvar->type == NULL) | |
404 | return -ENOMEM; | |
b55a87ad | 405 | return 0; |
4984912e MH |
406 | } |
407 | ||
b55a87ad | 408 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 409 | struct perf_probe_arg_field *field, |
0e60836b | 410 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 411 | Dwarf_Die *die_mem) |
7df2f329 | 412 | { |
0e60836b | 413 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
414 | Dwarf_Die type; |
415 | Dwarf_Word offs; | |
b2a3c12b | 416 | int ret, tag; |
7df2f329 MH |
417 | |
418 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
419 | if (die_get_real_type(vr_die, &type) == NULL) { |
420 | pr_warning("Failed to get the type of %s.\n", varname); | |
421 | return -ENOENT; | |
422 | } | |
b2a3c12b MH |
423 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
424 | tag = dwarf_tag(&type); | |
425 | ||
426 | if (field->name[0] == '[' && | |
427 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
428 | if (field->next) | |
429 | /* Save original type for next field */ | |
430 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
431 | /* Get the type of this array */ | |
432 | if (die_get_real_type(&type, &type) == NULL) { | |
433 | pr_warning("Failed to get the type of %s.\n", varname); | |
434 | return -ENOENT; | |
435 | } | |
436 | pr_debug2("Array real type: (%x)\n", | |
437 | (unsigned)dwarf_dieoffset(&type)); | |
438 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 439 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
440 | if (ref == NULL) |
441 | return -ENOMEM; | |
442 | if (*ref_ptr) | |
443 | (*ref_ptr)->next = ref; | |
444 | else | |
445 | *ref_ptr = ref; | |
446 | } | |
bcfc0821 | 447 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
448 | if (!field->next) |
449 | /* Save vr_die for converting types */ | |
450 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
451 | goto next; | |
452 | } else if (tag == DW_TAG_pointer_type) { | |
453 | /* Check the pointer and dereference */ | |
b55a87ad MH |
454 | if (!field->ref) { |
455 | pr_err("Semantic error: %s must be referred by '->'\n", | |
456 | field->name); | |
457 | return -EINVAL; | |
458 | } | |
7df2f329 | 459 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
460 | if (die_get_real_type(&type, &type) == NULL) { |
461 | pr_warning("Failed to get the type of %s.\n", varname); | |
462 | return -ENOENT; | |
463 | } | |
12e5a7ae | 464 | /* Verify it is a data structure */ |
7b0295b3 HL |
465 | tag = dwarf_tag(&type); |
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 | } | |
12e5a7ae | 471 | |
0e60836b | 472 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
473 | if (ref == NULL) |
474 | return -ENOMEM; | |
7df2f329 MH |
475 | if (*ref_ptr) |
476 | (*ref_ptr)->next = ref; | |
477 | else | |
478 | *ref_ptr = ref; | |
479 | } else { | |
12e5a7ae | 480 | /* Verify it is a data structure */ |
7b0295b3 HL |
481 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
482 | pr_warning("%s is not a data structure nor an union.\n", | |
483 | varname); | |
b55a87ad MH |
484 | return -EINVAL; |
485 | } | |
b2a3c12b | 486 | if (field->name[0] == '[') { |
d939be3a | 487 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 488 | " nor array.\n", varname); |
b2a3c12b MH |
489 | return -EINVAL; |
490 | } | |
c7273835 MH |
491 | /* While prcessing unnamed field, we don't care about this */ |
492 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
493 | pr_err("Semantic error: %s must be referred by '.'\n", |
494 | field->name); | |
495 | return -EINVAL; | |
496 | } | |
497 | if (!ref) { | |
498 | pr_warning("Structure on a register is not " | |
499 | "supported yet.\n"); | |
500 | return -ENOTSUP; | |
501 | } | |
7df2f329 MH |
502 | } |
503 | ||
b55a87ad | 504 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 505 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
506 | dwarf_diename(&type), field->name); |
507 | return -EINVAL; | |
508 | } | |
7df2f329 MH |
509 | |
510 | /* Get the offset of the field */ | |
7b0295b3 HL |
511 | if (tag == DW_TAG_union_type) { |
512 | offs = 0; | |
513 | } else { | |
514 | ret = die_get_data_member_location(die_mem, &offs); | |
515 | if (ret < 0) { | |
516 | pr_warning("Failed to get the offset of %s.\n", | |
517 | field->name); | |
518 | return ret; | |
519 | } | |
b55a87ad | 520 | } |
7df2f329 MH |
521 | ref->offset += (long)offs; |
522 | ||
c7273835 MH |
523 | /* If this member is unnamed, we need to reuse this field */ |
524 | if (!dwarf_diename(die_mem)) | |
525 | return convert_variable_fields(die_mem, varname, field, | |
526 | &ref, die_mem); | |
527 | ||
b2a3c12b | 528 | next: |
7df2f329 MH |
529 | /* Converting next field */ |
530 | if (field->next) | |
b55a87ad | 531 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 532 | field->next, &ref, die_mem); |
b55a87ad MH |
533 | else |
534 | return 0; | |
7df2f329 MH |
535 | } |
536 | ||
4ea42b18 | 537 | /* Show a variables in kprobe event format */ |
b55a87ad | 538 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 539 | { |
4984912e | 540 | Dwarf_Die die_mem; |
4ea42b18 MH |
541 | int ret; |
542 | ||
b7dcb857 MH |
543 | pr_debug("Converting variable %s into trace event.\n", |
544 | dwarf_diename(vr_die)); | |
804b3606 | 545 | |
cf6eb489 | 546 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
293d5b43 | 547 | &pf->sp_die, pf->machine, pf->tvar); |
7d5eaba9 HK |
548 | if (ret == -ENOENT || ret == -EINVAL) { |
549 | pr_err("Failed to find the location of the '%s' variable at this address.\n" | |
550 | " Perhaps it has been optimized out.\n" | |
551 | " Use -V with the --range option to show '%s' location range.\n", | |
552 | pf->pvar->var, pf->pvar->var); | |
553 | } else if (ret == -ENOTSUP) | |
cf6eb489 | 554 | pr_err("Sorry, we don't support this variable location yet.\n"); |
0c188a07 | 555 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
556 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
557 | pf->pvar->field, &pf->tvar->ref, | |
558 | &die_mem); | |
4984912e MH |
559 | vr_die = &die_mem; |
560 | } | |
73317b95 MH |
561 | if (ret == 0) |
562 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 563 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 564 | return ret; |
4ea42b18 MH |
565 | } |
566 | ||
221d0611 MH |
567 | /* Find a variable in a scope DIE */ |
568 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 569 | { |
f182e3e1 | 570 | Dwarf_Die vr_die; |
909b0360 | 571 | char *buf, *ptr; |
f182e3e1 | 572 | int ret = 0; |
4ea42b18 | 573 | |
da15bd9d WN |
574 | /* Copy raw parameters */ |
575 | if (!is_c_varname(pf->pvar->var)) | |
576 | return copy_to_probe_trace_arg(pf->tvar, pf->pvar); | |
367e94c1 | 577 | |
48481938 | 578 | if (pf->pvar->name) |
02b95dad | 579 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 580 | else { |
909b0360 MH |
581 | buf = synthesize_perf_probe_arg(pf->pvar); |
582 | if (!buf) | |
583 | return -ENOMEM; | |
11a1ca35 MH |
584 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
585 | if (ptr) | |
586 | *ptr = '_'; | |
909b0360 | 587 | pf->tvar->name = buf; |
48481938 | 588 | } |
02b95dad MH |
589 | if (pf->tvar->name == NULL) |
590 | return -ENOMEM; | |
48481938 | 591 | |
f182e3e1 | 592 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 593 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
594 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
595 | /* Search again in global variables */ | |
d13855ef HK |
596 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
597 | 0, &vr_die)) { | |
36d789a4 MH |
598 | pr_warning("Failed to find '%s' in this function.\n", |
599 | pf->pvar->var); | |
f182e3e1 | 600 | ret = -ENOENT; |
d13855ef | 601 | } |
b7dcb857 | 602 | } |
f66fedcb | 603 | if (ret >= 0) |
f182e3e1 MH |
604 | ret = convert_variable(&vr_die, pf); |
605 | ||
b7dcb857 | 606 | return ret; |
4ea42b18 MH |
607 | } |
608 | ||
cf6eb489 | 609 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
610 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
611 | Dwarf_Addr paddr, bool retprobe, | |
6cca13bd | 612 | const char *function, |
576b5237 | 613 | struct probe_trace_point *tp) |
4ea42b18 | 614 | { |
26b79524 | 615 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
616 | GElf_Sym sym; |
617 | const char *symbol; | |
618 | ||
619 | /* Verify the address is correct */ | |
620 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
621 | pr_warning("Failed to get entry address of %s\n", | |
622 | dwarf_diename(sp_die)); | |
623 | return -ENOENT; | |
624 | } | |
625 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
626 | pr_warning("Failed to get end address of %s\n", | |
627 | dwarf_diename(sp_die)); | |
628 | return -ENOENT; | |
629 | } | |
630 | if (paddr > highaddr) { | |
631 | pr_warning("Offset specified is greater than size of %s\n", | |
632 | dwarf_diename(sp_die)); | |
633 | return -EINVAL; | |
634 | } | |
635 | ||
664fee3d | 636 | symbol = dwarf_diename(sp_die); |
576b5237 | 637 | if (!symbol) { |
664fee3d MH |
638 | /* Try to get the symbol name from symtab */ |
639 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
640 | if (!symbol) { | |
641 | pr_warning("Failed to find symbol at 0x%lx\n", | |
642 | (unsigned long)paddr); | |
643 | return -ENOENT; | |
644 | } | |
645 | eaddr = sym.st_value; | |
576b5237 | 646 | } |
664fee3d | 647 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 648 | tp->address = (unsigned long)paddr; |
576b5237 MH |
649 | tp->symbol = strdup(symbol); |
650 | if (!tp->symbol) | |
651 | return -ENOMEM; | |
4235b045 | 652 | |
04ddd04b | 653 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
654 | if (retprobe) { |
655 | if (eaddr != paddr) { | |
6cca13bd MH |
656 | pr_warning("Failed to find \"%s%%return\",\n" |
657 | " because %s is an inlined function and" | |
658 | " has no return point.\n", function, | |
659 | function); | |
04ddd04b MH |
660 | return -EINVAL; |
661 | } | |
cf6eb489 | 662 | tp->retprobe = true; |
04ddd04b MH |
663 | } |
664 | ||
cf6eb489 MH |
665 | return 0; |
666 | } | |
667 | ||
221d0611 MH |
668 | /* Call probe_finder callback with scope DIE */ |
669 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 670 | { |
cf6eb489 | 671 | Dwarf_Attribute fb_attr; |
4d3b1626 | 672 | Dwarf_Frame *frame = NULL; |
cf6eb489 MH |
673 | size_t nops; |
674 | int ret; | |
675 | ||
221d0611 MH |
676 | if (!sc_die) { |
677 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
678 | return -EINVAL; | |
679 | } | |
680 | ||
681 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 682 | if (!die_is_func_def(sc_die)) { |
221d0611 | 683 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
d4c537e6 NR |
684 | if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
685 | pr_warning("Ignoring tail call from %s\n", | |
686 | dwarf_diename(&pf->sp_die)); | |
687 | return 0; | |
688 | } else { | |
689 | pr_warning("Failed to find probe point in any " | |
690 | "functions.\n"); | |
691 | return -ENOENT; | |
692 | } | |
cf6eb489 | 693 | } |
221d0611 MH |
694 | } else |
695 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 696 | |
221d0611 MH |
697 | /* Get the frame base attribute/ops from subprogram */ |
698 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 699 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 700 | if (ret <= 0 || nops == 0) { |
804b3606 | 701 | pf->fb_ops = NULL; |
7752f1b0 | 702 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 703 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
270bde1e HK |
704 | (pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) { |
705 | if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 && | |
706 | (dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) || | |
b55a87ad | 707 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { |
0e43e5d2 | 708 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad | 709 | (uintmax_t)pf->addr); |
4d3b1626 MH |
710 | free(frame); |
711 | return -ENOENT; | |
b55a87ad | 712 | } |
7752f1b0 | 713 | #endif |
a34a9854 | 714 | } |
804b3606 | 715 | |
cf6eb489 | 716 | /* Call finder's callback handler */ |
4d3b1626 | 717 | ret = pf->callback(sc_die, pf); |
804b3606 | 718 | |
4d3b1626 MH |
719 | /* Since *pf->fb_ops can be a part of frame. we should free it here. */ |
720 | free(frame); | |
804b3606 | 721 | pf->fb_ops = NULL; |
cf6eb489 MH |
722 | |
723 | return ret; | |
4ea42b18 MH |
724 | } |
725 | ||
221d0611 MH |
726 | struct find_scope_param { |
727 | const char *function; | |
728 | const char *file; | |
729 | int line; | |
730 | int diff; | |
731 | Dwarf_Die *die_mem; | |
732 | bool found; | |
733 | }; | |
734 | ||
735 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
736 | { | |
737 | struct find_scope_param *fsp = data; | |
738 | const char *file; | |
739 | int lno; | |
740 | ||
741 | /* Skip if declared file name does not match */ | |
742 | if (fsp->file) { | |
743 | file = dwarf_decl_file(fn_die); | |
744 | if (!file || strcmp(fsp->file, file) != 0) | |
745 | return 0; | |
746 | } | |
747 | /* If the function name is given, that's what user expects */ | |
748 | if (fsp->function) { | |
4c859351 | 749 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
750 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
751 | fsp->found = true; | |
752 | return 1; | |
753 | } | |
754 | } else { | |
755 | /* With the line number, find the nearest declared DIE */ | |
756 | dwarf_decl_line(fn_die, &lno); | |
757 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
758 | /* Keep a candidate and continue */ | |
759 | fsp->diff = fsp->line - lno; | |
760 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
761 | fsp->found = true; | |
762 | } | |
763 | } | |
764 | return 0; | |
765 | } | |
766 | ||
767 | /* Find an appropriate scope fits to given conditions */ | |
768 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
769 | { | |
770 | struct find_scope_param fsp = { | |
771 | .function = pf->pev->point.function, | |
772 | .file = pf->fname, | |
773 | .line = pf->lno, | |
774 | .diff = INT_MAX, | |
775 | .die_mem = die_mem, | |
776 | .found = false, | |
777 | }; | |
778 | ||
779 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
780 | ||
781 | return fsp.found ? die_mem : NULL; | |
782 | } | |
783 | ||
4cc9cec6 MH |
784 | static int probe_point_line_walker(const char *fname, int lineno, |
785 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 786 | { |
4cc9cec6 | 787 | struct probe_finder *pf = data; |
221d0611 | 788 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 789 | int ret; |
4ea42b18 | 790 | |
4cc9cec6 MH |
791 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
792 | return 0; | |
4ea42b18 | 793 | |
4cc9cec6 | 794 | pf->addr = addr; |
221d0611 MH |
795 | sc_die = find_best_scope(pf, &die_mem); |
796 | if (!sc_die) { | |
797 | pr_warning("Failed to find scope of probe point.\n"); | |
798 | return -ENOENT; | |
799 | } | |
800 | ||
801 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 802 | |
4cc9cec6 | 803 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 804 | return ret < 0 ? ret : 0; |
4cc9cec6 | 805 | } |
804b3606 | 806 | |
4cc9cec6 MH |
807 | /* Find probe point from its line number */ |
808 | static int find_probe_point_by_line(struct probe_finder *pf) | |
809 | { | |
810 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
811 | } |
812 | ||
2a9c8c36 | 813 | /* Find lines which match lazy pattern */ |
5a62257a | 814 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
815 | const char *fname, const char *pat) |
816 | { | |
f50c2169 FBH |
817 | FILE *fp; |
818 | char *line = NULL; | |
819 | size_t line_len; | |
820 | ssize_t len; | |
821 | int count = 0, linenum = 1; | |
5f03cba4 | 822 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
823 | |
824 | fp = fopen(fname, "r"); | |
825 | if (!fp) { | |
5f03cba4 | 826 | pr_warning("Failed to open %s: %s\n", fname, |
c8b5f2c9 | 827 | str_error_r(errno, sbuf, sizeof(sbuf))); |
b448c4b6 | 828 | return -errno; |
b55a87ad MH |
829 | } |
830 | ||
f50c2169 | 831 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 832 | |
f50c2169 FBH |
833 | if (line[len - 1] == '\n') |
834 | line[len - 1] = '\0'; | |
835 | ||
836 | if (strlazymatch(line, pat)) { | |
5a62257a | 837 | intlist__add(list, linenum); |
f50c2169 | 838 | count++; |
2a9c8c36 | 839 | } |
f50c2169 | 840 | linenum++; |
2a9c8c36 | 841 | } |
f50c2169 FBH |
842 | |
843 | if (ferror(fp)) | |
844 | count = -errno; | |
845 | free(line); | |
846 | fclose(fp); | |
847 | ||
848 | if (count == 0) | |
849 | pr_debug("No matched lines found in %s.\n", fname); | |
850 | return count; | |
2a9c8c36 MH |
851 | } |
852 | ||
4cc9cec6 MH |
853 | static int probe_point_lazy_walker(const char *fname, int lineno, |
854 | Dwarf_Addr addr, void *data) | |
855 | { | |
856 | struct probe_finder *pf = data; | |
221d0611 | 857 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
858 | int ret; |
859 | ||
5a62257a | 860 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
861 | strtailcmp(fname, pf->fname) != 0) |
862 | return 0; | |
863 | ||
864 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
865 | lineno, (unsigned long long)addr); | |
866 | pf->addr = addr; | |
221d0611 MH |
867 | pf->lno = lineno; |
868 | sc_die = find_best_scope(pf, &die_mem); | |
869 | if (!sc_die) { | |
870 | pr_warning("Failed to find scope of probe point.\n"); | |
871 | return -ENOENT; | |
872 | } | |
873 | ||
874 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
875 | |
876 | /* | |
877 | * Continue if no error, because the lazy pattern will match | |
878 | * to other lines | |
879 | */ | |
5e814dd5 | 880 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
881 | } |
882 | ||
2a9c8c36 | 883 | /* Find probe points from lazy pattern */ |
b55a87ad | 884 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 885 | { |
b55a87ad | 886 | int ret = 0; |
09ed8975 | 887 | char *fpath; |
2a9c8c36 | 888 | |
5a62257a | 889 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
890 | const char *comp_dir; |
891 | ||
892 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
893 | ret = get_real_path(pf->fname, comp_dir, &fpath); | |
894 | if (ret < 0) { | |
895 | pr_warning("Failed to find source file path.\n"); | |
896 | return ret; | |
897 | } | |
898 | ||
2a9c8c36 | 899 | /* Matching lazy line pattern */ |
09ed8975 | 900 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 901 | pf->pev->point.lazy_line); |
09ed8975 | 902 | free(fpath); |
f50c2169 | 903 | if (ret <= 0) |
b55a87ad | 904 | return ret; |
2a9c8c36 MH |
905 | } |
906 | ||
4cc9cec6 | 907 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
908 | } |
909 | ||
e47392bf RB |
910 | static void skip_prologue(Dwarf_Die *sp_die, struct probe_finder *pf) |
911 | { | |
912 | struct perf_probe_point *pp = &pf->pev->point; | |
913 | ||
914 | /* Not uprobe? */ | |
915 | if (!pf->pev->uprobes) | |
916 | return; | |
917 | ||
918 | /* Compiled with optimization? */ | |
6243b9dc | 919 | if (die_is_optimized_target(&pf->cu_die)) |
e47392bf RB |
920 | return; |
921 | ||
922 | /* Don't know entrypc? */ | |
923 | if (!pf->addr) | |
924 | return; | |
925 | ||
926 | /* Only FUNC and FUNC@SRC are eligible. */ | |
927 | if (!pp->function || pp->line || pp->retprobe || pp->lazy_line || | |
928 | pp->offset || pp->abs_address) | |
929 | return; | |
930 | ||
931 | /* Not interested in func parameter? */ | |
932 | if (!perf_probe_with_var(pf->pev)) | |
933 | return; | |
934 | ||
935 | pr_info("Target program is compiled without optimization. Skipping prologue.\n" | |
936 | "Probe on address 0x%" PRIx64 " to force probing at the function entry.\n\n", | |
937 | pf->addr); | |
938 | ||
6243b9dc | 939 | die_skip_prologue(sp_die, &pf->cu_die, &pf->addr); |
e47392bf RB |
940 | } |
941 | ||
e92b85e1 MH |
942 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
943 | { | |
db0d2c64 | 944 | struct probe_finder *pf = data; |
4235b045 | 945 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 946 | Dwarf_Addr addr; |
db0d2c64 | 947 | int ret; |
e92b85e1 | 948 | |
2a9c8c36 | 949 | if (pp->lazy_line) |
db0d2c64 | 950 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
951 | else { |
952 | /* Get probe address */ | |
b55a87ad | 953 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 954 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 955 | dwarf_diename(in_die)); |
db0d2c64 | 956 | return -ENOENT; |
b55a87ad MH |
957 | } |
958 | pf->addr = addr; | |
2a9c8c36 MH |
959 | pf->addr += pp->offset; |
960 | pr_debug("found inline addr: 0x%jx\n", | |
961 | (uintmax_t)pf->addr); | |
962 | ||
db0d2c64 | 963 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 964 | } |
e92b85e1 | 965 | |
db0d2c64 | 966 | return ret; |
e92b85e1 | 967 | } |
804b3606 | 968 | |
db0d2c64 MH |
969 | /* Callback parameter with return value for libdw */ |
970 | struct dwarf_callback_param { | |
971 | void *data; | |
972 | int retval; | |
973 | }; | |
974 | ||
4ea42b18 | 975 | /* Search function from function name */ |
e92b85e1 | 976 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 977 | { |
b55a87ad MH |
978 | struct dwarf_callback_param *param = data; |
979 | struct probe_finder *pf = param->data; | |
4235b045 | 980 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 981 | |
e92b85e1 | 982 | /* Check tag and diename */ |
0dbb1cac | 983 | if (!die_is_func_def(sp_die) || |
4c859351 | 984 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 985 | return DWARF_CB_OK; |
e92b85e1 | 986 | |
7d21635a MH |
987 | /* Check declared file */ |
988 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
989 | return DWARF_CB_OK; | |
990 | ||
4c859351 | 991 | pr_debug("Matched function: %s\n", dwarf_diename(sp_die)); |
2a9c8c36 | 992 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 993 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
994 | dwarf_decl_line(sp_die, &pf->lno); |
995 | pf->lno += pp->line; | |
b55a87ad | 996 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
997 | } else if (die_is_func_instance(sp_die)) { |
998 | /* Instances always have the entry address */ | |
999 | dwarf_entrypc(sp_die, &pf->addr); | |
e92b85e1 | 1000 | /* Real function */ |
2a9c8c36 | 1001 | if (pp->lazy_line) |
b55a87ad | 1002 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1003 | else { |
e47392bf | 1004 | skip_prologue(sp_die, pf); |
2a9c8c36 MH |
1005 | pf->addr += pp->offset; |
1006 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1007 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1008 | } |
4c859351 | 1009 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 1010 | /* Inlined function: search instances */ |
db0d2c64 MH |
1011 | param->retval = die_walk_instances(sp_die, |
1012 | probe_point_inline_cb, (void *)pf); | |
4c859351 MH |
1013 | /* This could be a non-existed inline definition */ |
1014 | if (param->retval == -ENOENT && strisglob(pp->function)) | |
1015 | param->retval = 0; | |
1016 | } | |
1017 | ||
1018 | /* We need to find other candidates */ | |
1019 | if (strisglob(pp->function) && param->retval >= 0) { | |
1020 | param->retval = 0; /* We have to clear the result */ | |
1021 | return DWARF_CB_OK; | |
1022 | } | |
e92b85e1 | 1023 | |
b55a87ad | 1024 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1025 | } |
1026 | ||
b55a87ad | 1027 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1028 | { |
b55a87ad MH |
1029 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1030 | .retval = 0}; | |
1031 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1032 | return _param.retval; | |
4ea42b18 MH |
1033 | } |
1034 | ||
cd25f8bc LM |
1035 | struct pubname_callback_param { |
1036 | char *function; | |
1037 | char *file; | |
1038 | Dwarf_Die *cu_die; | |
1039 | Dwarf_Die *sp_die; | |
1040 | int found; | |
1041 | }; | |
1042 | ||
1043 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1044 | { | |
1045 | struct pubname_callback_param *param = data; | |
1046 | ||
1047 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1048 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1049 | return DWARF_CB_OK; | |
1050 | ||
4c859351 | 1051 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
1052 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
1053 | return DWARF_CB_OK; | |
1054 | ||
1055 | if (param->file && | |
1056 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1057 | return DWARF_CB_OK; | |
1058 | ||
1059 | param->found = 1; | |
1060 | return DWARF_CB_ABORT; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | return DWARF_CB_OK; | |
1065 | } | |
1066 | ||
270bde1e | 1067 | static int debuginfo__find_probe_location(struct debuginfo *dbg, |
ff741783 | 1068 | struct probe_finder *pf) |
4ea42b18 | 1069 | { |
cf6eb489 | 1070 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1071 | Dwarf_Off off, noff; |
1072 | size_t cuhl; | |
1073 | Dwarf_Die *diep; | |
b55a87ad | 1074 | int ret = 0; |
804b3606 | 1075 | |
804b3606 | 1076 | off = 0; |
5a62257a MH |
1077 | pf->lcache = intlist__new(NULL); |
1078 | if (!pf->lcache) | |
1079 | return -ENOMEM; | |
cd25f8bc LM |
1080 | |
1081 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1082 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1083 | struct pubname_callback_param pubname_param = { |
1084 | .function = pp->function, | |
1085 | .file = pp->file, | |
1086 | .cu_die = &pf->cu_die, | |
1087 | .sp_die = &pf->sp_die, | |
2b348a77 | 1088 | .found = 0, |
cd25f8bc LM |
1089 | }; |
1090 | struct dwarf_callback_param probe_param = { | |
1091 | .data = pf, | |
1092 | }; | |
1093 | ||
316c7136 | 1094 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1095 | &pubname_param, 0); |
cd25f8bc LM |
1096 | if (pubname_param.found) { |
1097 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1098 | if (ret) | |
1099 | goto found; | |
1100 | } | |
1101 | } | |
1102 | ||
804b3606 | 1103 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1104 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1105 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1106 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1107 | if (!diep) |
1108 | continue; | |
4ea42b18 MH |
1109 | |
1110 | /* Check if target file is included. */ | |
1111 | if (pp->file) | |
cf6eb489 | 1112 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1113 | else |
cf6eb489 | 1114 | pf->fname = NULL; |
4ea42b18 | 1115 | |
cf6eb489 | 1116 | if (!pp->file || pf->fname) { |
4ea42b18 | 1117 | if (pp->function) |
cf6eb489 | 1118 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1119 | else if (pp->lazy_line) |
f19e80c6 | 1120 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1121 | else { |
cf6eb489 MH |
1122 | pf->lno = pp->line; |
1123 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1124 | } |
8635bf6e | 1125 | if (ret < 0) |
fbee632d | 1126 | break; |
4ea42b18 | 1127 | } |
804b3606 | 1128 | off = noff; |
4ea42b18 | 1129 | } |
cd25f8bc LM |
1130 | |
1131 | found: | |
5a62257a MH |
1132 | intlist__delete(pf->lcache); |
1133 | pf->lcache = NULL; | |
4ea42b18 | 1134 | |
cf6eb489 MH |
1135 | return ret; |
1136 | } | |
1137 | ||
270bde1e HK |
1138 | /* Find probe points from debuginfo */ |
1139 | static int debuginfo__find_probes(struct debuginfo *dbg, | |
1140 | struct probe_finder *pf) | |
1141 | { | |
1142 | int ret = 0; | |
270bde1e HK |
1143 | Elf *elf; |
1144 | GElf_Ehdr ehdr; | |
270bde1e HK |
1145 | |
1146 | if (pf->cfi_eh || pf->cfi_dbg) | |
1147 | return debuginfo__find_probe_location(dbg, pf); | |
1148 | ||
1149 | /* Get the call frame information from this dwarf */ | |
1150 | elf = dwarf_getelf(dbg->dbg); | |
1151 | if (elf == NULL) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1155 | return -EINVAL; | |
1156 | ||
293d5b43 MH |
1157 | pf->machine = ehdr.e_machine; |
1158 | ||
1159 | #if _ELFUTILS_PREREQ(0, 142) | |
1160 | do { | |
1161 | GElf_Shdr shdr; | |
1162 | ||
1163 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1164 | shdr.sh_type == SHT_PROGBITS) | |
1165 | pf->cfi_eh = dwarf_getcfi_elf(elf); | |
270bde1e | 1166 | |
293d5b43 MH |
1167 | pf->cfi_dbg = dwarf_getcfi(dbg->dbg); |
1168 | } while (0); | |
270bde1e HK |
1169 | #endif |
1170 | ||
1171 | ret = debuginfo__find_probe_location(dbg, pf); | |
1172 | return ret; | |
1173 | } | |
1174 | ||
7969ec77 MH |
1175 | struct local_vars_finder { |
1176 | struct probe_finder *pf; | |
1177 | struct perf_probe_arg *args; | |
f8bffbf1 | 1178 | bool vars; |
7969ec77 MH |
1179 | int max_args; |
1180 | int nargs; | |
1181 | int ret; | |
1182 | }; | |
1183 | ||
1184 | /* Collect available variables in this scope */ | |
1185 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1186 | { | |
1187 | struct local_vars_finder *vf = data; | |
3d918a12 | 1188 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1189 | int tag; |
1190 | ||
1191 | tag = dwarf_tag(die_mem); | |
1192 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1193 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1194 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 | 1195 | vf->pf->fb_ops, &pf->sp_die, |
293d5b43 | 1196 | pf->machine, NULL) == 0) { |
7969ec77 MH |
1197 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1198 | if (vf->args[vf->nargs].var == NULL) { | |
1199 | vf->ret = -ENOMEM; | |
1200 | return DIE_FIND_CB_END; | |
1201 | } | |
1202 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1203 | vf->nargs++; | |
1204 | } | |
1205 | } | |
1206 | ||
1207 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1208 | return DIE_FIND_CB_CONTINUE; | |
1209 | else | |
1210 | return DIE_FIND_CB_SIBLING; | |
1211 | } | |
1212 | ||
1213 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1214 | struct perf_probe_arg *args) | |
1215 | { | |
1216 | Dwarf_Die die_mem; | |
1217 | int i; | |
1218 | int n = 0; | |
f8bffbf1 | 1219 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1220 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1221 | ||
1222 | for (i = 0; i < pf->pev->nargs; i++) { | |
1223 | /* var never be NULL */ | |
f8bffbf1 MH |
1224 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1225 | vf.vars = true; | |
1226 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1227 | /* Copy normal argument */ |
1228 | args[n] = pf->pev->args[i]; | |
1229 | n++; | |
f8bffbf1 | 1230 | continue; |
7969ec77 | 1231 | } |
f8bffbf1 MH |
1232 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1233 | vf.nargs = n; | |
1234 | /* Special local variables */ | |
1235 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1236 | &die_mem); | |
1237 | pr_debug(" (%d)\n", vf.nargs - n); | |
1238 | if (vf.ret < 0) | |
1239 | return vf.ret; | |
1240 | n = vf.nargs; | |
7969ec77 MH |
1241 | } |
1242 | return n; | |
1243 | } | |
1244 | ||
cf6eb489 | 1245 | /* Add a found probe point into trace event list */ |
221d0611 | 1246 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1247 | { |
1248 | struct trace_event_finder *tf = | |
1249 | container_of(pf, struct trace_event_finder, pf); | |
6cca13bd | 1250 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1251 | struct probe_trace_event *tev; |
092b1f0b | 1252 | struct perf_probe_arg *args = NULL; |
cf6eb489 MH |
1253 | int ret, i; |
1254 | ||
1255 | /* Check number of tevs */ | |
1256 | if (tf->ntevs == tf->max_tevs) { | |
1257 | pr_warning("Too many( > %d) probe point found.\n", | |
1258 | tf->max_tevs); | |
1259 | return -ERANGE; | |
1260 | } | |
1261 | tev = &tf->tevs[tf->ntevs++]; | |
1262 | ||
221d0611 | 1263 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1264 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
6cca13bd | 1265 | pp->retprobe, pp->function, &tev->point); |
cf6eb489 | 1266 | if (ret < 0) |
092b1f0b | 1267 | goto end; |
cf6eb489 | 1268 | |
4c859351 | 1269 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
092b1f0b WN |
1270 | if (!tev->point.realname) { |
1271 | ret = -ENOMEM; | |
1272 | goto end; | |
1273 | } | |
4c859351 | 1274 | |
cf6eb489 MH |
1275 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1276 | tev->point.offset); | |
1277 | ||
7969ec77 MH |
1278 | /* Expand special probe argument if exist */ |
1279 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
092b1f0b WN |
1280 | if (args == NULL) { |
1281 | ret = -ENOMEM; | |
1282 | goto end; | |
1283 | } | |
7969ec77 MH |
1284 | |
1285 | ret = expand_probe_args(sc_die, pf, args); | |
1286 | if (ret < 0) | |
1287 | goto end; | |
1288 | ||
1289 | tev->nargs = ret; | |
1290 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1291 | if (tev->args == NULL) { | |
1292 | ret = -ENOMEM; | |
1293 | goto end; | |
1294 | } | |
1295 | ||
1296 | /* Find each argument */ | |
1297 | for (i = 0; i < tev->nargs; i++) { | |
1298 | pf->pvar = &args[i]; | |
cf6eb489 | 1299 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1300 | /* Variable should be found from scope DIE */ |
1301 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1302 | if (ret != 0) |
7969ec77 | 1303 | break; |
cf6eb489 MH |
1304 | } |
1305 | ||
7969ec77 | 1306 | end: |
092b1f0b WN |
1307 | if (ret) { |
1308 | clear_probe_trace_event(tev); | |
1309 | tf->ntevs--; | |
1310 | } | |
7969ec77 MH |
1311 | free(args); |
1312 | return ret; | |
cf6eb489 MH |
1313 | } |
1314 | ||
1315 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
316c7136 | 1316 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1317 | struct perf_probe_event *pev, |
ddb2f58f | 1318 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1319 | { |
1320 | struct trace_event_finder tf = { | |
1321 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
ddb2f58f | 1322 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
0196e787 | 1323 | int ret, i; |
cf6eb489 MH |
1324 | |
1325 | /* Allocate result tevs array */ | |
ddb2f58f | 1326 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1327 | if (*tevs == NULL) |
1328 | return -ENOMEM; | |
1329 | ||
1330 | tf.tevs = *tevs; | |
1331 | tf.ntevs = 0; | |
1332 | ||
316c7136 | 1333 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cf6eb489 | 1334 | if (ret < 0) { |
0196e787 MH |
1335 | for (i = 0; i < tf.ntevs; i++) |
1336 | clear_probe_trace_event(&tf.tevs[i]); | |
04662523 | 1337 | zfree(tevs); |
cf6eb489 MH |
1338 | return ret; |
1339 | } | |
1340 | ||
1341 | return (ret < 0) ? ret : tf.ntevs; | |
1342 | } | |
1343 | ||
cf6eb489 MH |
1344 | /* Collect available variables in this scope */ |
1345 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1346 | { | |
1347 | struct available_var_finder *af = data; | |
1348 | struct variable_list *vl; | |
bf4d5f25 | 1349 | struct strbuf buf = STRBUF_INIT; |
cf6eb489 MH |
1350 | int tag, ret; |
1351 | ||
1352 | vl = &af->vls[af->nvls - 1]; | |
1353 | ||
1354 | tag = dwarf_tag(die_mem); | |
1355 | if (tag == DW_TAG_formal_parameter || | |
1356 | tag == DW_TAG_variable) { | |
1357 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 | 1358 | af->pf.fb_ops, &af->pf.sp_die, |
293d5b43 | 1359 | af->pf.machine, NULL); |
349e8d26 HK |
1360 | if (ret == 0 || ret == -ERANGE) { |
1361 | int ret2; | |
1362 | bool externs = !af->child; | |
fb9596d1 | 1363 | |
bf4d5f25 MH |
1364 | if (strbuf_init(&buf, 64) < 0) |
1365 | goto error; | |
349e8d26 HK |
1366 | |
1367 | if (probe_conf.show_location_range) { | |
bf4d5f25 MH |
1368 | if (!externs) |
1369 | ret2 = strbuf_add(&buf, | |
1370 | ret ? "[INV]\t" : "[VAL]\t", 6); | |
1371 | else | |
1372 | ret2 = strbuf_add(&buf, "[EXT]\t", 6); | |
1373 | if (ret2) | |
1374 | goto error; | |
349e8d26 HK |
1375 | } |
1376 | ||
1377 | ret2 = die_get_varname(die_mem, &buf); | |
1378 | ||
1379 | if (!ret2 && probe_conf.show_location_range && | |
1380 | !externs) { | |
bf4d5f25 MH |
1381 | if (strbuf_addch(&buf, '\t') < 0) |
1382 | goto error; | |
349e8d26 HK |
1383 | ret2 = die_get_var_range(&af->pf.sp_die, |
1384 | die_mem, &buf); | |
1385 | } | |
1386 | ||
1387 | pr_debug("Add new var: %s\n", buf.buf); | |
1388 | if (ret2 == 0) { | |
fb9596d1 HK |
1389 | strlist__add(vl->vars, |
1390 | strbuf_detach(&buf, NULL)); | |
bf4d5f25 MH |
1391 | } |
1392 | strbuf_release(&buf); | |
cf6eb489 MH |
1393 | } |
1394 | } | |
1395 | ||
fb8c5a56 | 1396 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1397 | return DIE_FIND_CB_CONTINUE; |
1398 | else | |
1399 | return DIE_FIND_CB_SIBLING; | |
bf4d5f25 MH |
1400 | error: |
1401 | strbuf_release(&buf); | |
1402 | pr_debug("Error in strbuf\n"); | |
1403 | return DIE_FIND_CB_END; | |
cf6eb489 MH |
1404 | } |
1405 | ||
1406 | /* Add a found vars into available variables list */ | |
221d0611 | 1407 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1408 | { |
1409 | struct available_var_finder *af = | |
1410 | container_of(pf, struct available_var_finder, pf); | |
6cca13bd | 1411 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1412 | struct variable_list *vl; |
f182e3e1 MH |
1413 | Dwarf_Die die_mem; |
1414 | int ret; | |
cf6eb489 MH |
1415 | |
1416 | /* Check number of tevs */ | |
1417 | if (af->nvls == af->max_vls) { | |
1418 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1419 | return -ERANGE; | |
1420 | } | |
1421 | vl = &af->vls[af->nvls++]; | |
1422 | ||
221d0611 | 1423 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1424 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
6cca13bd | 1425 | pp->retprobe, pp->function, &vl->point); |
cf6eb489 MH |
1426 | if (ret < 0) |
1427 | return ret; | |
1428 | ||
1429 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1430 | vl->point.offset); | |
1431 | ||
1432 | /* Find local variables */ | |
4a77e218 | 1433 | vl->vars = strlist__new(NULL, NULL); |
cf6eb489 MH |
1434 | if (vl->vars == NULL) |
1435 | return -ENOMEM; | |
fb8c5a56 | 1436 | af->child = true; |
221d0611 | 1437 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1438 | |
fb8c5a56 | 1439 | /* Find external variables */ |
ddb2f58f | 1440 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1441 | goto out; |
ddb2f58f | 1442 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1443 | af->child = false; |
f182e3e1 | 1444 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1445 | |
1446 | out: | |
cf6eb489 MH |
1447 | if (strlist__empty(vl->vars)) { |
1448 | strlist__delete(vl->vars); | |
1449 | vl->vars = NULL; | |
1450 | } | |
1451 | ||
1452 | return ret; | |
1453 | } | |
1454 | ||
69e96eaa MH |
1455 | /* |
1456 | * Find available variables at given probe point | |
1457 | * Return the number of found probe points. Return 0 if there is no | |
1458 | * matched probe point. Return <0 if an error occurs. | |
1459 | */ | |
316c7136 | 1460 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1461 | struct perf_probe_event *pev, |
ddb2f58f | 1462 | struct variable_list **vls) |
cf6eb489 MH |
1463 | { |
1464 | struct available_var_finder af = { | |
1465 | .pf = {.pev = pev, .callback = add_available_vars}, | |
316c7136 | 1466 | .mod = dbg->mod, |
ddb2f58f | 1467 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1468 | int ret; |
1469 | ||
1470 | /* Allocate result vls array */ | |
ddb2f58f | 1471 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1472 | if (*vls == NULL) |
1473 | return -ENOMEM; | |
1474 | ||
1475 | af.vls = *vls; | |
1476 | af.nvls = 0; | |
1477 | ||
316c7136 | 1478 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1479 | if (ret < 0) { |
1480 | /* Free vlist for error */ | |
1481 | while (af.nvls--) { | |
74cf249d | 1482 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1483 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1484 | } |
04662523 | 1485 | zfree(vls); |
cf6eb489 MH |
1486 | return ret; |
1487 | } | |
1488 | ||
1489 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1490 | } |
1491 | ||
9b239a12 MH |
1492 | /* For the kernel module, we need a special code to get a DIE */ |
1493 | static int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs) | |
1494 | { | |
1495 | int n, i; | |
1496 | Elf32_Word shndx; | |
1497 | Elf_Scn *scn; | |
1498 | Elf *elf; | |
1499 | GElf_Shdr mem, *shdr; | |
1500 | const char *p; | |
1501 | ||
1502 | elf = dwfl_module_getelf(dbg->mod, &dbg->bias); | |
1503 | if (!elf) | |
1504 | return -EINVAL; | |
1505 | ||
1506 | /* Get the number of relocations */ | |
1507 | n = dwfl_module_relocations(dbg->mod); | |
1508 | if (n < 0) | |
1509 | return -ENOENT; | |
1510 | /* Search the relocation related .text section */ | |
1511 | for (i = 0; i < n; i++) { | |
1512 | p = dwfl_module_relocation_info(dbg->mod, i, &shndx); | |
1513 | if (strcmp(p, ".text") == 0) { | |
1514 | /* OK, get the section header */ | |
1515 | scn = elf_getscn(elf, shndx); | |
1516 | if (!scn) | |
1517 | return -ENOENT; | |
1518 | shdr = gelf_getshdr(scn, &mem); | |
1519 | if (!shdr) | |
1520 | return -ENOENT; | |
1521 | *offs = shdr->sh_addr; | |
1522 | } | |
1523 | } | |
1524 | return 0; | |
1525 | } | |
1526 | ||
fb1587d8 | 1527 | /* Reverse search */ |
316c7136 | 1528 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1529 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1530 | { |
1531 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1532 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1533 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1534 | int baseline = 0, lineno = 0, ret = 0; |
9b239a12 | 1535 | bool reloc = false; |
fb1587d8 | 1536 | |
9b239a12 | 1537 | retry: |
fb1587d8 | 1538 | /* Find cu die */ |
0104fe69 | 1539 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
9b239a12 MH |
1540 | if (!reloc && debuginfo__get_text_offset(dbg, &baseaddr) == 0) { |
1541 | addr += baseaddr; | |
1542 | reloc = true; | |
1543 | goto retry; | |
1544 | } | |
0e43e5d2 MH |
1545 | pr_warning("Failed to find debug information for address %lx\n", |
1546 | addr); | |
75ec5a24 MH |
1547 | ret = -EINVAL; |
1548 | goto end; | |
1549 | } | |
fb1587d8 | 1550 | |
1d46ea2a MH |
1551 | /* Find a corresponding line (filename and lineno) */ |
1552 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1553 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1554 | |
1d46ea2a | 1555 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1556 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1557 | /* Get function entry information */ |
e08cfd4b MH |
1558 | func = basefunc = dwarf_diename(&spdie); |
1559 | if (!func || | |
1d46ea2a | 1560 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1561 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1562 | lineno = 0; | |
1d46ea2a | 1563 | goto post; |
e08cfd4b | 1564 | } |
1d46ea2a | 1565 | |
1b286bdd | 1566 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1567 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1568 | /* Function entry - Relative line number is 0 */ |
1569 | lineno = baseline; | |
e08cfd4b MH |
1570 | goto post; |
1571 | } | |
1572 | ||
1573 | /* Track down the inline functions step by step */ | |
1574 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1575 | &indie)) { | |
1576 | /* There is an inline function */ | |
1d46ea2a | 1577 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1578 | _addr == addr) { |
1d46ea2a MH |
1579 | /* |
1580 | * addr is at an inline function entry. | |
1581 | * In this case, lineno should be the call-site | |
e08cfd4b | 1582 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1583 | */ |
1584 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1585 | fname = die_get_call_file(&indie); |
1586 | break; | |
1587 | } else { | |
1d46ea2a MH |
1588 | /* |
1589 | * addr is in an inline function body. | |
1590 | * Since lineno points one of the lines | |
1591 | * of the inline function, baseline should | |
1592 | * be the entry line of the inline function. | |
1593 | */ | |
b55a87ad | 1594 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1595 | if (!tmp || |
1596 | dwarf_decl_line(&indie, &baseline) != 0) | |
1597 | break; | |
1598 | func = tmp; | |
1599 | spdie = indie; | |
b55a87ad | 1600 | } |
fb1587d8 | 1601 | } |
e08cfd4b MH |
1602 | /* Verify the lineno and baseline are in a same file */ |
1603 | tmp = dwarf_decl_file(&spdie); | |
1604 | if (!tmp || strcmp(tmp, fname) != 0) | |
1605 | lineno = 0; | |
1d46ea2a MH |
1606 | } |
1607 | ||
1608 | post: | |
1609 | /* Make a relative line number or an offset */ | |
1610 | if (lineno) | |
1611 | ppt->line = lineno - baseline; | |
e08cfd4b | 1612 | else if (basefunc) { |
1d46ea2a | 1613 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1614 | func = basefunc; |
1615 | } | |
1d46ea2a MH |
1616 | |
1617 | /* Duplicate strings */ | |
1618 | if (func) { | |
1619 | ppt->function = strdup(func); | |
02b95dad MH |
1620 | if (ppt->function == NULL) { |
1621 | ret = -ENOMEM; | |
1622 | goto end; | |
1623 | } | |
fb1587d8 | 1624 | } |
1d46ea2a MH |
1625 | if (fname) { |
1626 | ppt->file = strdup(fname); | |
1627 | if (ppt->file == NULL) { | |
04662523 | 1628 | zfree(&ppt->function); |
1d46ea2a MH |
1629 | ret = -ENOMEM; |
1630 | goto end; | |
1631 | } | |
1632 | } | |
fb1587d8 | 1633 | end: |
1d46ea2a MH |
1634 | if (ret == 0 && (fname || func)) |
1635 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1636 | return ret; |
1637 | } | |
1638 | ||
f6c903f5 MH |
1639 | /* Add a line and store the src path */ |
1640 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1641 | struct line_range *lr) | |
1642 | { | |
7cf0b79e | 1643 | /* Copy source path */ |
f6c903f5 | 1644 | if (!lr->path) { |
7cf0b79e MH |
1645 | lr->path = strdup(src); |
1646 | if (lr->path == NULL) | |
1647 | return -ENOMEM; | |
f6c903f5 | 1648 | } |
5a62257a | 1649 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1650 | } |
1651 | ||
4cc9cec6 | 1652 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1653 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1654 | void *data) |
f6c903f5 | 1655 | { |
4cc9cec6 | 1656 | struct line_finder *lf = data; |
202c7c12 | 1657 | int err; |
f6c903f5 | 1658 | |
4cc9cec6 | 1659 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1660 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1661 | return 0; |
f6c903f5 | 1662 | |
202c7c12 NK |
1663 | err = line_range_add_line(fname, lineno, lf->lr); |
1664 | if (err < 0 && err != -EEXIST) | |
1665 | return err; | |
f6c903f5 | 1666 | |
4cc9cec6 | 1667 | return 0; |
f6c903f5 | 1668 | } |
fb1587d8 | 1669 | |
631c9def | 1670 | /* Find line range from its line number */ |
b55a87ad | 1671 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1672 | { |
4cc9cec6 | 1673 | int ret; |
f6c903f5 | 1674 | |
4cc9cec6 | 1675 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1676 | |
804b3606 | 1677 | /* Update status */ |
f6c903f5 | 1678 | if (ret >= 0) |
5a62257a | 1679 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1680 | ret = lf->found = 1; |
1681 | else | |
1682 | ret = 0; /* Lines are not found */ | |
804b3606 | 1683 | else { |
04662523 | 1684 | zfree(&lf->lr->path); |
804b3606 | 1685 | } |
f6c903f5 | 1686 | return ret; |
631c9def MH |
1687 | } |
1688 | ||
161a26b0 MH |
1689 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1690 | { | |
182c228e | 1691 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1692 | |
1693 | /* | |
1694 | * We have to check all instances of inlined function, because | |
1695 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1696 | * function argument of instances. However, if an error occurs, |
1697 | * it should be handled by the caller. | |
36c0c588 | 1698 | */ |
182c228e | 1699 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1700 | } |
1701 | ||
0dbb1cac | 1702 | /* Search function definition from function name */ |
e92b85e1 | 1703 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1704 | { |
b55a87ad MH |
1705 | struct dwarf_callback_param *param = data; |
1706 | struct line_finder *lf = param->data; | |
631c9def | 1707 | struct line_range *lr = lf->lr; |
631c9def | 1708 | |
7d21635a MH |
1709 | /* Check declared file */ |
1710 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1711 | return DWARF_CB_OK; | |
1712 | ||
0dbb1cac | 1713 | if (die_is_func_def(sp_die) && |
4c859351 | 1714 | die_match_name(sp_die, lr->function)) { |
e92b85e1 MH |
1715 | lf->fname = dwarf_decl_file(sp_die); |
1716 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1717 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1718 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1719 | if (lf->lno_s < 0) /* Overflow */ |
1720 | lf->lno_s = INT_MAX; | |
1721 | lf->lno_e = lr->offset + lr->end; | |
1722 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1723 | lf->lno_e = INT_MAX; |
d3b63d7a | 1724 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1725 | lr->start = lf->lno_s; |
1726 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1727 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1728 | param->retval = die_walk_instances(sp_die, |
1729 | line_range_inline_cb, lf); | |
1730 | else | |
b55a87ad MH |
1731 | param->retval = find_line_range_by_line(sp_die, lf); |
1732 | return DWARF_CB_ABORT; | |
631c9def | 1733 | } |
b55a87ad | 1734 | return DWARF_CB_OK; |
631c9def MH |
1735 | } |
1736 | ||
b55a87ad | 1737 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1738 | { |
b55a87ad MH |
1739 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1740 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1741 | return param.retval; | |
631c9def MH |
1742 | } |
1743 | ||
316c7136 | 1744 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1745 | { |
804b3606 | 1746 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1747 | int ret = 0; |
804b3606 MH |
1748 | Dwarf_Off off = 0, noff; |
1749 | size_t cuhl; | |
1750 | Dwarf_Die *diep; | |
6a330a3c | 1751 | const char *comp_dir; |
804b3606 | 1752 | |
cd25f8bc LM |
1753 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1754 | if (lr->function) { | |
1755 | struct pubname_callback_param pubname_param = { | |
1756 | .function = lr->function, .file = lr->file, | |
1757 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1758 | struct dwarf_callback_param line_range_param = { | |
1759 | .data = (void *)&lf, .retval = 0}; | |
1760 | ||
316c7136 | 1761 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1762 | &pubname_param, 0); |
cd25f8bc LM |
1763 | if (pubname_param.found) { |
1764 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1765 | if (lf.found) | |
1766 | goto found; | |
1767 | } | |
1768 | } | |
1769 | ||
804b3606 | 1770 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1771 | while (!lf.found && ret >= 0) { |
316c7136 | 1772 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1773 | NULL, NULL, NULL) != 0) |
631c9def MH |
1774 | break; |
1775 | ||
1776 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1777 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1778 | if (!diep) |
1779 | continue; | |
631c9def MH |
1780 | |
1781 | /* Check if target file is included. */ | |
1782 | if (lr->file) | |
2a9c8c36 | 1783 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1784 | else |
2a9c8c36 | 1785 | lf.fname = 0; |
631c9def | 1786 | |
2a9c8c36 | 1787 | if (!lr->file || lf.fname) { |
631c9def | 1788 | if (lr->function) |
b55a87ad | 1789 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1790 | else { |
1791 | lf.lno_s = lr->start; | |
d3b63d7a | 1792 | lf.lno_e = lr->end; |
b55a87ad | 1793 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1794 | } |
631c9def | 1795 | } |
804b3606 | 1796 | off = noff; |
631c9def | 1797 | } |
6a330a3c | 1798 | |
cd25f8bc | 1799 | found: |
6a330a3c MH |
1800 | /* Store comp_dir */ |
1801 | if (lf.found) { | |
1802 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1803 | if (comp_dir) { | |
1804 | lr->comp_dir = strdup(comp_dir); | |
1805 | if (!lr->comp_dir) | |
1806 | ret = -ENOMEM; | |
1807 | } | |
1808 | } | |
1809 | ||
7cf0b79e | 1810 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1811 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1812 | } |
1813 | ||
09ed8975 NA |
1814 | /* |
1815 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
1816 | * and chop off leading directories that do not exist. Result is passed back as | |
1817 | * a newly allocated path on success. | |
1818 | * Return 0 if file was found and readable, -errno otherwise. | |
1819 | */ | |
1820 | int get_real_path(const char *raw_path, const char *comp_dir, | |
1821 | char **new_path) | |
1822 | { | |
1823 | const char *prefix = symbol_conf.source_prefix; | |
1824 | ||
1825 | if (!prefix) { | |
1826 | if (raw_path[0] != '/' && comp_dir) | |
1827 | /* If not an absolute path, try to use comp_dir */ | |
1828 | prefix = comp_dir; | |
1829 | else { | |
1830 | if (access(raw_path, R_OK) == 0) { | |
1831 | *new_path = strdup(raw_path); | |
1832 | return *new_path ? 0 : -ENOMEM; | |
1833 | } else | |
1834 | return -errno; | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
1839 | if (!*new_path) | |
1840 | return -ENOMEM; | |
1841 | ||
1842 | for (;;) { | |
1843 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
1844 | ||
1845 | if (access(*new_path, R_OK) == 0) | |
1846 | return 0; | |
1847 | ||
1848 | if (!symbol_conf.source_prefix) { | |
1849 | /* In case of searching comp_dir, don't retry */ | |
1850 | zfree(new_path); | |
1851 | return -errno; | |
1852 | } | |
1853 | ||
1854 | switch (errno) { | |
1855 | case ENAMETOOLONG: | |
1856 | case ENOENT: | |
1857 | case EROFS: | |
1858 | case EFAULT: | |
1859 | raw_path = strchr(++raw_path, '/'); | |
1860 | if (!raw_path) { | |
1861 | zfree(new_path); | |
1862 | return -ENOENT; | |
1863 | } | |
1864 | continue; | |
1865 | ||
1866 | default: | |
1867 | zfree(new_path); | |
1868 | return -errno; | |
1869 | } | |
1870 | } | |
1871 | } |