Commit | Line | Data |
---|---|---|
4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
4ea42b18 MH |
29 | #include <stdlib.h> |
30 | #include <string.h> | |
31 | #include <stdarg.h> | |
cd932c59 | 32 | #include <dwarf-regs.h> |
074fc0e4 | 33 | |
124bb83c | 34 | #include <linux/bitops.h> |
89c69c0e | 35 | #include "event.h" |
a15ad2f5 | 36 | #include "dso.h" |
89c69c0e | 37 | #include "debug.h" |
5a62257a | 38 | #include "intlist.h" |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
469b9b88 | 46 | /* Dwarf FL wrappers */ |
469b9b88 MH |
47 | static char *debuginfo_path; /* Currently dummy */ |
48 | ||
49 | static const Dwfl_Callbacks offline_callbacks = { | |
50 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
51 | .debuginfo_path = &debuginfo_path, | |
52 | ||
53 | .section_address = dwfl_offline_section_address, | |
54 | ||
55 | /* We use this table for core files too. */ | |
56 | .find_elf = dwfl_build_id_find_elf, | |
57 | }; | |
58 | ||
469b9b88 | 59 | /* Get a Dwarf from offline image */ |
316c7136 | 60 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
ff741783 | 61 | const char *path) |
469b9b88 | 62 | { |
ff741783 | 63 | int fd; |
469b9b88 | 64 | |
ff741783 MH |
65 | fd = open(path, O_RDONLY); |
66 | if (fd < 0) | |
67 | return fd; | |
469b9b88 | 68 | |
316c7136 ACM |
69 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
70 | if (!dbg->dwfl) | |
ff741783 | 71 | goto error; |
469b9b88 | 72 | |
316c7136 ACM |
73 | dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd); |
74 | if (!dbg->mod) | |
469b9b88 MH |
75 | goto error; |
76 | ||
316c7136 ACM |
77 | dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias); |
78 | if (!dbg->dbg) | |
ff741783 MH |
79 | goto error; |
80 | ||
81 | return 0; | |
469b9b88 | 82 | error: |
316c7136 ACM |
83 | if (dbg->dwfl) |
84 | dwfl_end(dbg->dwfl); | |
ff741783 MH |
85 | else |
86 | close(fd); | |
316c7136 | 87 | memset(dbg, 0, sizeof(*dbg)); |
ff741783 MH |
88 | |
89 | return -ENOENT; | |
469b9b88 MH |
90 | } |
91 | ||
a15ad2f5 | 92 | static struct debuginfo *__debuginfo__new(const char *path) |
ff741783 | 93 | { |
316c7136 ACM |
94 | struct debuginfo *dbg = zalloc(sizeof(*dbg)); |
95 | if (!dbg) | |
3b4694de MH |
96 | return NULL; |
97 | ||
04662523 ACM |
98 | if (debuginfo__init_offline_dwarf(dbg, path) < 0) |
99 | zfree(&dbg); | |
a15ad2f5 MH |
100 | if (dbg) |
101 | pr_debug("Open Debuginfo file: %s\n", path); | |
316c7136 | 102 | return dbg; |
ff741783 MH |
103 | } |
104 | ||
a15ad2f5 MH |
105 | enum dso_binary_type distro_dwarf_types[] = { |
106 | DSO_BINARY_TYPE__FEDORA_DEBUGINFO, | |
107 | DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, | |
108 | DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, | |
109 | DSO_BINARY_TYPE__BUILDID_DEBUGINFO, | |
110 | DSO_BINARY_TYPE__NOT_FOUND, | |
111 | }; | |
112 | ||
113 | struct debuginfo *debuginfo__new(const char *path) | |
114 | { | |
115 | enum dso_binary_type *type; | |
116 | char buf[PATH_MAX], nil = '\0'; | |
117 | struct dso *dso; | |
118 | struct debuginfo *dinfo = NULL; | |
119 | ||
120 | /* Try to open distro debuginfo files */ | |
121 | dso = dso__new(path); | |
122 | if (!dso) | |
123 | goto out; | |
124 | ||
125 | for (type = distro_dwarf_types; | |
126 | !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; | |
127 | type++) { | |
128 | if (dso__read_binary_type_filename(dso, *type, &nil, | |
129 | buf, PATH_MAX) < 0) | |
130 | continue; | |
131 | dinfo = __debuginfo__new(buf); | |
132 | } | |
133 | dso__delete(dso); | |
134 | ||
135 | out: | |
136 | /* if failed to open all distro debuginfo, open given binary */ | |
137 | return dinfo ? : __debuginfo__new(path); | |
138 | } | |
139 | ||
316c7136 | 140 | void debuginfo__delete(struct debuginfo *dbg) |
ff741783 | 141 | { |
316c7136 ACM |
142 | if (dbg) { |
143 | if (dbg->dwfl) | |
144 | dwfl_end(dbg->dwfl); | |
145 | free(dbg); | |
ff741783 | 146 | } |
3b4694de | 147 | } |
469b9b88 | 148 | |
4ea42b18 MH |
149 | /* |
150 | * Probe finder related functions | |
151 | */ | |
152 | ||
0e60836b | 153 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 154 | { |
0e60836b SD |
155 | struct probe_trace_arg_ref *ref; |
156 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
157 | if (ref != NULL) |
158 | ref->offset = offs; | |
159 | return ref; | |
160 | } | |
161 | ||
cf6eb489 MH |
162 | /* |
163 | * Convert a location into trace_arg. | |
164 | * If tvar == NULL, this just checks variable can be converted. | |
3d918a12 MH |
165 | * If fentry == true and vr_die is a parameter, do huristic search |
166 | * for the location fuzzed by function entry mcount. | |
cf6eb489 MH |
167 | */ |
168 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
3d918a12 | 169 | Dwarf_Op *fb_ops, Dwarf_Die *sp_die, |
cf6eb489 | 170 | struct probe_trace_arg *tvar) |
4ea42b18 | 171 | { |
b7dcb857 | 172 | Dwarf_Attribute attr; |
3d918a12 | 173 | Dwarf_Addr tmp = 0; |
b7dcb857 MH |
174 | Dwarf_Op *op; |
175 | size_t nops; | |
804b3606 MH |
176 | unsigned int regn; |
177 | Dwarf_Word offs = 0; | |
4235b045 | 178 | bool ref = false; |
4ea42b18 | 179 | const char *regs; |
b7dcb857 MH |
180 | int ret; |
181 | ||
632941c4 MH |
182 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
183 | goto static_var; | |
184 | ||
b7dcb857 | 185 | /* TODO: handle more than 1 exprs */ |
3d918a12 MH |
186 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
187 | return -EINVAL; /* Broken DIE ? */ | |
188 | if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) { | |
189 | ret = dwarf_entrypc(sp_die, &tmp); | |
190 | if (ret || addr != tmp || | |
191 | dwarf_tag(vr_die) != DW_TAG_formal_parameter || | |
192 | dwarf_highpc(sp_die, &tmp)) | |
193 | return -ENOENT; | |
194 | /* | |
195 | * This is fuzzed by fentry mcount. We try to find the | |
196 | * parameter location at the earliest address. | |
197 | */ | |
198 | for (addr += 1; addr <= tmp; addr++) { | |
199 | if (dwarf_getlocation_addr(&attr, addr, &op, | |
200 | &nops, 1) > 0) | |
201 | goto found; | |
202 | } | |
b7dcb857 MH |
203 | return -ENOENT; |
204 | } | |
3d918a12 MH |
205 | found: |
206 | if (nops == 0) | |
207 | /* TODO: Support const_value */ | |
208 | return -ENOENT; | |
b7dcb857 MH |
209 | |
210 | if (op->atom == DW_OP_addr) { | |
632941c4 | 211 | static_var: |
cf6eb489 MH |
212 | if (!tvar) |
213 | return 0; | |
b7dcb857 MH |
214 | /* Static variables on memory (not stack), make @varname */ |
215 | ret = strlen(dwarf_diename(vr_die)); | |
216 | tvar->value = zalloc(ret + 2); | |
217 | if (tvar->value == NULL) | |
218 | return -ENOMEM; | |
219 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
220 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
221 | if (tvar->ref == NULL) | |
222 | return -ENOMEM; | |
223 | return 0; | |
224 | } | |
4ea42b18 | 225 | |
4ea42b18 | 226 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 227 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 228 | if (fb_ops == NULL) |
b55a87ad | 229 | return -ENOTSUP; |
4235b045 | 230 | ref = true; |
804b3606 | 231 | offs = op->number; |
cf6eb489 | 232 | op = &fb_ops[0]; |
804b3606 | 233 | } |
4ea42b18 | 234 | |
804b3606 MH |
235 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
236 | regn = op->atom - DW_OP_breg0; | |
237 | offs += op->number; | |
4235b045 | 238 | ref = true; |
804b3606 MH |
239 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
240 | regn = op->atom - DW_OP_reg0; | |
241 | } else if (op->atom == DW_OP_bregx) { | |
242 | regn = op->number; | |
243 | offs += op->number2; | |
4235b045 | 244 | ref = true; |
804b3606 MH |
245 | } else if (op->atom == DW_OP_regx) { |
246 | regn = op->number; | |
b55a87ad | 247 | } else { |
cf6eb489 | 248 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
249 | return -ENOTSUP; |
250 | } | |
4ea42b18 | 251 | |
cf6eb489 MH |
252 | if (!tvar) |
253 | return 0; | |
254 | ||
4ea42b18 | 255 | regs = get_arch_regstr(regn); |
b55a87ad | 256 | if (!regs) { |
cf6eb489 | 257 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
258 | pr_warning("Mapping for the register number %u " |
259 | "missing on this architecture.\n", regn); | |
b55a87ad MH |
260 | return -ERANGE; |
261 | } | |
4ea42b18 | 262 | |
02b95dad MH |
263 | tvar->value = strdup(regs); |
264 | if (tvar->value == NULL) | |
265 | return -ENOMEM; | |
266 | ||
4235b045 | 267 | if (ref) { |
b7dcb857 | 268 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
269 | if (tvar->ref == NULL) |
270 | return -ENOMEM; | |
4235b045 | 271 | } |
b55a87ad | 272 | return 0; |
4ea42b18 MH |
273 | } |
274 | ||
124bb83c MH |
275 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
276 | ||
b55a87ad | 277 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 278 | struct probe_trace_arg *tvar, |
73317b95 | 279 | const char *cast) |
4984912e | 280 | { |
0e60836b | 281 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
282 | Dwarf_Die type; |
283 | char buf[16]; | |
5f03cba4 | 284 | char sbuf[STRERR_BUFSIZE]; |
bcfc0821 | 285 | int bsize, boffs, total; |
4984912e MH |
286 | int ret; |
287 | ||
73317b95 MH |
288 | /* TODO: check all types */ |
289 | if (cast && strcmp(cast, "string") != 0) { | |
290 | /* Non string type is OK */ | |
291 | tvar->type = strdup(cast); | |
292 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
293 | } | |
294 | ||
bcfc0821 MH |
295 | bsize = dwarf_bitsize(vr_die); |
296 | if (bsize > 0) { | |
124bb83c | 297 | /* This is a bitfield */ |
bcfc0821 MH |
298 | boffs = dwarf_bitoffset(vr_die); |
299 | total = dwarf_bytesize(vr_die); | |
300 | if (boffs < 0 || total < 0) | |
301 | return -ENOENT; | |
302 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
303 | BYTES_TO_BITS(total)); | |
124bb83c MH |
304 | goto formatted; |
305 | } | |
306 | ||
b55a87ad MH |
307 | if (die_get_real_type(vr_die, &type) == NULL) { |
308 | pr_warning("Failed to get a type information of %s.\n", | |
309 | dwarf_diename(vr_die)); | |
310 | return -ENOENT; | |
311 | } | |
4984912e | 312 | |
b2a3c12b MH |
313 | pr_debug("%s type is %s.\n", |
314 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
315 | ||
73317b95 MH |
316 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
317 | ret = dwarf_tag(&type); | |
318 | if (ret != DW_TAG_pointer_type && | |
319 | ret != DW_TAG_array_type) { | |
320 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 321 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
322 | dwarf_diename(vr_die), dwarf_diename(&type)); |
323 | return -EINVAL; | |
324 | } | |
7ce28b5b HL |
325 | if (die_get_real_type(&type, &type) == NULL) { |
326 | pr_warning("Failed to get a type" | |
327 | " information.\n"); | |
328 | return -ENOENT; | |
329 | } | |
73317b95 | 330 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
331 | while (*ref_ptr) |
332 | ref_ptr = &(*ref_ptr)->next; | |
333 | /* Add new reference with offset +0 */ | |
0e60836b | 334 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
335 | if (*ref_ptr == NULL) { |
336 | pr_warning("Out of memory error\n"); | |
337 | return -ENOMEM; | |
338 | } | |
339 | } | |
82175633 MH |
340 | if (!die_compare_name(&type, "char") && |
341 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 342 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 343 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
344 | dwarf_diename(vr_die)); |
345 | return -EINVAL; | |
346 | } | |
347 | tvar->type = strdup(cast); | |
348 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
349 | } | |
350 | ||
bcfc0821 MH |
351 | ret = dwarf_bytesize(&type); |
352 | if (ret <= 0) | |
124bb83c MH |
353 | /* No size ... try to use default type */ |
354 | return 0; | |
bcfc0821 | 355 | ret = BYTES_TO_BITS(ret); |
4984912e | 356 | |
124bb83c MH |
357 | /* Check the bitwidth */ |
358 | if (ret > MAX_BASIC_TYPE_BITS) { | |
359 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
360 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
361 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 362 | } |
124bb83c MH |
363 | ret = snprintf(buf, 16, "%c%d", |
364 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
365 | ||
366 | formatted: | |
367 | if (ret < 0 || ret >= 16) { | |
368 | if (ret >= 16) | |
369 | ret = -E2BIG; | |
370 | pr_warning("Failed to convert variable type: %s\n", | |
5f03cba4 | 371 | strerror_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
372 | return ret; |
373 | } | |
374 | tvar->type = strdup(buf); | |
375 | if (tvar->type == NULL) | |
376 | return -ENOMEM; | |
b55a87ad | 377 | return 0; |
4984912e MH |
378 | } |
379 | ||
b55a87ad | 380 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 381 | struct perf_probe_arg_field *field, |
0e60836b | 382 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 383 | Dwarf_Die *die_mem) |
7df2f329 | 384 | { |
0e60836b | 385 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
386 | Dwarf_Die type; |
387 | Dwarf_Word offs; | |
b2a3c12b | 388 | int ret, tag; |
7df2f329 MH |
389 | |
390 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
391 | if (die_get_real_type(vr_die, &type) == NULL) { |
392 | pr_warning("Failed to get the type of %s.\n", varname); | |
393 | return -ENOENT; | |
394 | } | |
b2a3c12b MH |
395 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
396 | tag = dwarf_tag(&type); | |
397 | ||
398 | if (field->name[0] == '[' && | |
399 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
400 | if (field->next) | |
401 | /* Save original type for next field */ | |
402 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
403 | /* Get the type of this array */ | |
404 | if (die_get_real_type(&type, &type) == NULL) { | |
405 | pr_warning("Failed to get the type of %s.\n", varname); | |
406 | return -ENOENT; | |
407 | } | |
408 | pr_debug2("Array real type: (%x)\n", | |
409 | (unsigned)dwarf_dieoffset(&type)); | |
410 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 411 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
412 | if (ref == NULL) |
413 | return -ENOMEM; | |
414 | if (*ref_ptr) | |
415 | (*ref_ptr)->next = ref; | |
416 | else | |
417 | *ref_ptr = ref; | |
418 | } | |
bcfc0821 | 419 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
420 | if (!field->next) |
421 | /* Save vr_die for converting types */ | |
422 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
423 | goto next; | |
424 | } else if (tag == DW_TAG_pointer_type) { | |
425 | /* Check the pointer and dereference */ | |
b55a87ad MH |
426 | if (!field->ref) { |
427 | pr_err("Semantic error: %s must be referred by '->'\n", | |
428 | field->name); | |
429 | return -EINVAL; | |
430 | } | |
7df2f329 | 431 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
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 | } | |
12e5a7ae | 436 | /* Verify it is a data structure */ |
7b0295b3 HL |
437 | tag = dwarf_tag(&type); |
438 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
439 | pr_warning("%s is not a data structure nor an union.\n", | |
440 | varname); | |
b55a87ad MH |
441 | return -EINVAL; |
442 | } | |
12e5a7ae | 443 | |
0e60836b | 444 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
445 | if (ref == NULL) |
446 | return -ENOMEM; | |
7df2f329 MH |
447 | if (*ref_ptr) |
448 | (*ref_ptr)->next = ref; | |
449 | else | |
450 | *ref_ptr = ref; | |
451 | } else { | |
12e5a7ae | 452 | /* Verify it is a data structure */ |
7b0295b3 HL |
453 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
454 | pr_warning("%s is not a data structure nor an union.\n", | |
455 | varname); | |
b55a87ad MH |
456 | return -EINVAL; |
457 | } | |
b2a3c12b | 458 | if (field->name[0] == '[') { |
d939be3a | 459 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 460 | " nor array.\n", varname); |
b2a3c12b MH |
461 | return -EINVAL; |
462 | } | |
c7273835 MH |
463 | /* While prcessing unnamed field, we don't care about this */ |
464 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
465 | pr_err("Semantic error: %s must be referred by '.'\n", |
466 | field->name); | |
467 | return -EINVAL; | |
468 | } | |
469 | if (!ref) { | |
470 | pr_warning("Structure on a register is not " | |
471 | "supported yet.\n"); | |
472 | return -ENOTSUP; | |
473 | } | |
7df2f329 MH |
474 | } |
475 | ||
b55a87ad | 476 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 477 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
478 | dwarf_diename(&type), field->name); |
479 | return -EINVAL; | |
480 | } | |
7df2f329 MH |
481 | |
482 | /* Get the offset of the field */ | |
7b0295b3 HL |
483 | if (tag == DW_TAG_union_type) { |
484 | offs = 0; | |
485 | } else { | |
486 | ret = die_get_data_member_location(die_mem, &offs); | |
487 | if (ret < 0) { | |
488 | pr_warning("Failed to get the offset of %s.\n", | |
489 | field->name); | |
490 | return ret; | |
491 | } | |
b55a87ad | 492 | } |
7df2f329 MH |
493 | ref->offset += (long)offs; |
494 | ||
c7273835 MH |
495 | /* If this member is unnamed, we need to reuse this field */ |
496 | if (!dwarf_diename(die_mem)) | |
497 | return convert_variable_fields(die_mem, varname, field, | |
498 | &ref, die_mem); | |
499 | ||
b2a3c12b | 500 | next: |
7df2f329 MH |
501 | /* Converting next field */ |
502 | if (field->next) | |
b55a87ad | 503 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 504 | field->next, &ref, die_mem); |
b55a87ad MH |
505 | else |
506 | return 0; | |
7df2f329 MH |
507 | } |
508 | ||
4ea42b18 | 509 | /* Show a variables in kprobe event format */ |
b55a87ad | 510 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 511 | { |
4984912e | 512 | Dwarf_Die die_mem; |
4ea42b18 MH |
513 | int ret; |
514 | ||
b7dcb857 MH |
515 | pr_debug("Converting variable %s into trace event.\n", |
516 | dwarf_diename(vr_die)); | |
804b3606 | 517 | |
cf6eb489 | 518 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
3d918a12 | 519 | &pf->sp_die, pf->tvar); |
0c188a07 | 520 | if (ret == -ENOENT || ret == -EINVAL) |
cf6eb489 MH |
521 | pr_err("Failed to find the location of %s at this address.\n" |
522 | " Perhaps, it has been optimized out.\n", pf->pvar->var); | |
523 | else if (ret == -ENOTSUP) | |
524 | pr_err("Sorry, we don't support this variable location yet.\n"); | |
0c188a07 | 525 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
526 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
527 | pf->pvar->field, &pf->tvar->ref, | |
528 | &die_mem); | |
4984912e MH |
529 | vr_die = &die_mem; |
530 | } | |
73317b95 MH |
531 | if (ret == 0) |
532 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 533 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 534 | return ret; |
4ea42b18 MH |
535 | } |
536 | ||
221d0611 MH |
537 | /* Find a variable in a scope DIE */ |
538 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 539 | { |
f182e3e1 | 540 | Dwarf_Die vr_die; |
11a1ca35 | 541 | char buf[32], *ptr; |
f182e3e1 | 542 | int ret = 0; |
4ea42b18 | 543 | |
367e94c1 MH |
544 | if (!is_c_varname(pf->pvar->var)) { |
545 | /* Copy raw parameters */ | |
546 | pf->tvar->value = strdup(pf->pvar->var); | |
547 | if (pf->tvar->value == NULL) | |
548 | return -ENOMEM; | |
549 | if (pf->pvar->type) { | |
550 | pf->tvar->type = strdup(pf->pvar->type); | |
551 | if (pf->tvar->type == NULL) | |
552 | return -ENOMEM; | |
553 | } | |
554 | if (pf->pvar->name) { | |
555 | pf->tvar->name = strdup(pf->pvar->name); | |
556 | if (pf->tvar->name == NULL) | |
557 | return -ENOMEM; | |
558 | } else | |
559 | pf->tvar->name = NULL; | |
560 | return 0; | |
561 | } | |
562 | ||
48481938 | 563 | if (pf->pvar->name) |
02b95dad | 564 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 565 | else { |
02b95dad MH |
566 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
567 | if (ret < 0) | |
568 | return ret; | |
11a1ca35 MH |
569 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
570 | if (ptr) | |
571 | *ptr = '_'; | |
02b95dad | 572 | pf->tvar->name = strdup(buf); |
48481938 | 573 | } |
02b95dad MH |
574 | if (pf->tvar->name == NULL) |
575 | return -ENOMEM; | |
48481938 | 576 | |
f182e3e1 | 577 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 578 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
579 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
580 | /* Search again in global variables */ | |
d13855ef HK |
581 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
582 | 0, &vr_die)) { | |
36d789a4 MH |
583 | pr_warning("Failed to find '%s' in this function.\n", |
584 | pf->pvar->var); | |
f182e3e1 | 585 | ret = -ENOENT; |
d13855ef | 586 | } |
b7dcb857 | 587 | } |
f66fedcb | 588 | if (ret >= 0) |
f182e3e1 MH |
589 | ret = convert_variable(&vr_die, pf); |
590 | ||
b7dcb857 | 591 | return ret; |
4ea42b18 MH |
592 | } |
593 | ||
cf6eb489 | 594 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
595 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
596 | Dwarf_Addr paddr, bool retprobe, | |
597 | struct probe_trace_point *tp) | |
4ea42b18 | 598 | { |
26b79524 | 599 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
600 | GElf_Sym sym; |
601 | const char *symbol; | |
602 | ||
603 | /* Verify the address is correct */ | |
604 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
605 | pr_warning("Failed to get entry address of %s\n", | |
606 | dwarf_diename(sp_die)); | |
607 | return -ENOENT; | |
608 | } | |
609 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
610 | pr_warning("Failed to get end address of %s\n", | |
611 | dwarf_diename(sp_die)); | |
612 | return -ENOENT; | |
613 | } | |
614 | if (paddr > highaddr) { | |
615 | pr_warning("Offset specified is greater than size of %s\n", | |
616 | dwarf_diename(sp_die)); | |
617 | return -EINVAL; | |
618 | } | |
619 | ||
664fee3d | 620 | symbol = dwarf_diename(sp_die); |
576b5237 | 621 | if (!symbol) { |
664fee3d MH |
622 | /* Try to get the symbol name from symtab */ |
623 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
624 | if (!symbol) { | |
625 | pr_warning("Failed to find symbol at 0x%lx\n", | |
626 | (unsigned long)paddr); | |
627 | return -ENOENT; | |
628 | } | |
629 | eaddr = sym.st_value; | |
576b5237 | 630 | } |
664fee3d | 631 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 632 | tp->address = (unsigned long)paddr; |
576b5237 MH |
633 | tp->symbol = strdup(symbol); |
634 | if (!tp->symbol) | |
635 | return -ENOMEM; | |
4235b045 | 636 | |
04ddd04b | 637 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
638 | if (retprobe) { |
639 | if (eaddr != paddr) { | |
04ddd04b | 640 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 641 | " a real function.\n"); |
04ddd04b MH |
642 | return -EINVAL; |
643 | } | |
cf6eb489 | 644 | tp->retprobe = true; |
04ddd04b MH |
645 | } |
646 | ||
cf6eb489 MH |
647 | return 0; |
648 | } | |
649 | ||
221d0611 MH |
650 | /* Call probe_finder callback with scope DIE */ |
651 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 652 | { |
cf6eb489 MH |
653 | Dwarf_Attribute fb_attr; |
654 | size_t nops; | |
655 | int ret; | |
656 | ||
221d0611 MH |
657 | if (!sc_die) { |
658 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
659 | return -EINVAL; | |
660 | } | |
661 | ||
662 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 663 | if (!die_is_func_def(sc_die)) { |
221d0611 | 664 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
cf6eb489 MH |
665 | pr_warning("Failed to find probe point in any " |
666 | "functions.\n"); | |
667 | return -ENOENT; | |
668 | } | |
221d0611 MH |
669 | } else |
670 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 671 | |
221d0611 MH |
672 | /* Get the frame base attribute/ops from subprogram */ |
673 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 674 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 675 | if (ret <= 0 || nops == 0) { |
804b3606 | 676 | pf->fb_ops = NULL; |
7752f1b0 | 677 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
678 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
679 | pf->cfi != NULL) { | |
680 | Dwarf_Frame *frame; | |
b55a87ad MH |
681 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
682 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 683 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
684 | (uintmax_t)pf->addr); |
685 | return -ENOENT; | |
686 | } | |
7752f1b0 | 687 | #endif |
a34a9854 | 688 | } |
804b3606 | 689 | |
cf6eb489 | 690 | /* Call finder's callback handler */ |
221d0611 | 691 | ret = pf->callback(sc_die, pf); |
804b3606 MH |
692 | |
693 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
694 | pf->fb_ops = NULL; | |
cf6eb489 MH |
695 | |
696 | return ret; | |
4ea42b18 MH |
697 | } |
698 | ||
221d0611 MH |
699 | struct find_scope_param { |
700 | const char *function; | |
701 | const char *file; | |
702 | int line; | |
703 | int diff; | |
704 | Dwarf_Die *die_mem; | |
705 | bool found; | |
706 | }; | |
707 | ||
708 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
709 | { | |
710 | struct find_scope_param *fsp = data; | |
711 | const char *file; | |
712 | int lno; | |
713 | ||
714 | /* Skip if declared file name does not match */ | |
715 | if (fsp->file) { | |
716 | file = dwarf_decl_file(fn_die); | |
717 | if (!file || strcmp(fsp->file, file) != 0) | |
718 | return 0; | |
719 | } | |
720 | /* If the function name is given, that's what user expects */ | |
721 | if (fsp->function) { | |
4c859351 | 722 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
723 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
724 | fsp->found = true; | |
725 | return 1; | |
726 | } | |
727 | } else { | |
728 | /* With the line number, find the nearest declared DIE */ | |
729 | dwarf_decl_line(fn_die, &lno); | |
730 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
731 | /* Keep a candidate and continue */ | |
732 | fsp->diff = fsp->line - lno; | |
733 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
734 | fsp->found = true; | |
735 | } | |
736 | } | |
737 | return 0; | |
738 | } | |
739 | ||
740 | /* Find an appropriate scope fits to given conditions */ | |
741 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
742 | { | |
743 | struct find_scope_param fsp = { | |
744 | .function = pf->pev->point.function, | |
745 | .file = pf->fname, | |
746 | .line = pf->lno, | |
747 | .diff = INT_MAX, | |
748 | .die_mem = die_mem, | |
749 | .found = false, | |
750 | }; | |
751 | ||
752 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
753 | ||
754 | return fsp.found ? die_mem : NULL; | |
755 | } | |
756 | ||
4cc9cec6 MH |
757 | static int probe_point_line_walker(const char *fname, int lineno, |
758 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 759 | { |
4cc9cec6 | 760 | struct probe_finder *pf = data; |
221d0611 | 761 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 762 | int ret; |
4ea42b18 | 763 | |
4cc9cec6 MH |
764 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
765 | return 0; | |
4ea42b18 | 766 | |
4cc9cec6 | 767 | pf->addr = addr; |
221d0611 MH |
768 | sc_die = find_best_scope(pf, &die_mem); |
769 | if (!sc_die) { | |
770 | pr_warning("Failed to find scope of probe point.\n"); | |
771 | return -ENOENT; | |
772 | } | |
773 | ||
774 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 775 | |
4cc9cec6 | 776 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 777 | return ret < 0 ? ret : 0; |
4cc9cec6 | 778 | } |
804b3606 | 779 | |
4cc9cec6 MH |
780 | /* Find probe point from its line number */ |
781 | static int find_probe_point_by_line(struct probe_finder *pf) | |
782 | { | |
783 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
784 | } |
785 | ||
2a9c8c36 | 786 | /* Find lines which match lazy pattern */ |
5a62257a | 787 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
788 | const char *fname, const char *pat) |
789 | { | |
f50c2169 FBH |
790 | FILE *fp; |
791 | char *line = NULL; | |
792 | size_t line_len; | |
793 | ssize_t len; | |
794 | int count = 0, linenum = 1; | |
5f03cba4 | 795 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
796 | |
797 | fp = fopen(fname, "r"); | |
798 | if (!fp) { | |
5f03cba4 MH |
799 | pr_warning("Failed to open %s: %s\n", fname, |
800 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
b448c4b6 | 801 | return -errno; |
b55a87ad MH |
802 | } |
803 | ||
f50c2169 | 804 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 805 | |
f50c2169 FBH |
806 | if (line[len - 1] == '\n') |
807 | line[len - 1] = '\0'; | |
808 | ||
809 | if (strlazymatch(line, pat)) { | |
5a62257a | 810 | intlist__add(list, linenum); |
f50c2169 | 811 | count++; |
2a9c8c36 | 812 | } |
f50c2169 | 813 | linenum++; |
2a9c8c36 | 814 | } |
f50c2169 FBH |
815 | |
816 | if (ferror(fp)) | |
817 | count = -errno; | |
818 | free(line); | |
819 | fclose(fp); | |
820 | ||
821 | if (count == 0) | |
822 | pr_debug("No matched lines found in %s.\n", fname); | |
823 | return count; | |
2a9c8c36 MH |
824 | } |
825 | ||
4cc9cec6 MH |
826 | static int probe_point_lazy_walker(const char *fname, int lineno, |
827 | Dwarf_Addr addr, void *data) | |
828 | { | |
829 | struct probe_finder *pf = data; | |
221d0611 | 830 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
831 | int ret; |
832 | ||
5a62257a | 833 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
834 | strtailcmp(fname, pf->fname) != 0) |
835 | return 0; | |
836 | ||
837 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
838 | lineno, (unsigned long long)addr); | |
839 | pf->addr = addr; | |
221d0611 MH |
840 | pf->lno = lineno; |
841 | sc_die = find_best_scope(pf, &die_mem); | |
842 | if (!sc_die) { | |
843 | pr_warning("Failed to find scope of probe point.\n"); | |
844 | return -ENOENT; | |
845 | } | |
846 | ||
847 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
848 | |
849 | /* | |
850 | * Continue if no error, because the lazy pattern will match | |
851 | * to other lines | |
852 | */ | |
5e814dd5 | 853 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
854 | } |
855 | ||
2a9c8c36 | 856 | /* Find probe points from lazy pattern */ |
b55a87ad | 857 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 858 | { |
b55a87ad | 859 | int ret = 0; |
09ed8975 | 860 | char *fpath; |
2a9c8c36 | 861 | |
5a62257a | 862 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
863 | const char *comp_dir; |
864 | ||
865 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
866 | ret = get_real_path(pf->fname, comp_dir, &fpath); | |
867 | if (ret < 0) { | |
868 | pr_warning("Failed to find source file path.\n"); | |
869 | return ret; | |
870 | } | |
871 | ||
2a9c8c36 | 872 | /* Matching lazy line pattern */ |
09ed8975 | 873 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 874 | pf->pev->point.lazy_line); |
09ed8975 | 875 | free(fpath); |
f50c2169 | 876 | if (ret <= 0) |
b55a87ad | 877 | return ret; |
2a9c8c36 MH |
878 | } |
879 | ||
4cc9cec6 | 880 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
881 | } |
882 | ||
e92b85e1 MH |
883 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
884 | { | |
db0d2c64 | 885 | struct probe_finder *pf = data; |
4235b045 | 886 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 887 | Dwarf_Addr addr; |
db0d2c64 | 888 | int ret; |
e92b85e1 | 889 | |
2a9c8c36 | 890 | if (pp->lazy_line) |
db0d2c64 | 891 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
892 | else { |
893 | /* Get probe address */ | |
b55a87ad | 894 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 895 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 896 | dwarf_diename(in_die)); |
db0d2c64 | 897 | return -ENOENT; |
b55a87ad MH |
898 | } |
899 | pf->addr = addr; | |
2a9c8c36 MH |
900 | pf->addr += pp->offset; |
901 | pr_debug("found inline addr: 0x%jx\n", | |
902 | (uintmax_t)pf->addr); | |
903 | ||
db0d2c64 | 904 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 905 | } |
e92b85e1 | 906 | |
db0d2c64 | 907 | return ret; |
e92b85e1 | 908 | } |
804b3606 | 909 | |
db0d2c64 MH |
910 | /* Callback parameter with return value for libdw */ |
911 | struct dwarf_callback_param { | |
912 | void *data; | |
913 | int retval; | |
914 | }; | |
915 | ||
4ea42b18 | 916 | /* Search function from function name */ |
e92b85e1 | 917 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 918 | { |
b55a87ad MH |
919 | struct dwarf_callback_param *param = data; |
920 | struct probe_finder *pf = param->data; | |
4235b045 | 921 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 922 | |
e92b85e1 | 923 | /* Check tag and diename */ |
0dbb1cac | 924 | if (!die_is_func_def(sp_die) || |
4c859351 | 925 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 926 | return DWARF_CB_OK; |
e92b85e1 | 927 | |
7d21635a MH |
928 | /* Check declared file */ |
929 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
930 | return DWARF_CB_OK; | |
931 | ||
4c859351 | 932 | pr_debug("Matched function: %s\n", dwarf_diename(sp_die)); |
2a9c8c36 | 933 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 934 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
935 | dwarf_decl_line(sp_die, &pf->lno); |
936 | pf->lno += pp->line; | |
b55a87ad | 937 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
938 | } else if (die_is_func_instance(sp_die)) { |
939 | /* Instances always have the entry address */ | |
940 | dwarf_entrypc(sp_die, &pf->addr); | |
e92b85e1 | 941 | /* Real function */ |
2a9c8c36 | 942 | if (pp->lazy_line) |
b55a87ad | 943 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 944 | else { |
2a9c8c36 MH |
945 | pf->addr += pp->offset; |
946 | /* TODO: Check the address in this function */ | |
cf6eb489 | 947 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 948 | } |
4c859351 | 949 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 950 | /* Inlined function: search instances */ |
db0d2c64 MH |
951 | param->retval = die_walk_instances(sp_die, |
952 | probe_point_inline_cb, (void *)pf); | |
4c859351 MH |
953 | /* This could be a non-existed inline definition */ |
954 | if (param->retval == -ENOENT && strisglob(pp->function)) | |
955 | param->retval = 0; | |
956 | } | |
957 | ||
958 | /* We need to find other candidates */ | |
959 | if (strisglob(pp->function) && param->retval >= 0) { | |
960 | param->retval = 0; /* We have to clear the result */ | |
961 | return DWARF_CB_OK; | |
962 | } | |
e92b85e1 | 963 | |
b55a87ad | 964 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
965 | } |
966 | ||
b55a87ad | 967 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 968 | { |
b55a87ad MH |
969 | struct dwarf_callback_param _param = {.data = (void *)pf, |
970 | .retval = 0}; | |
971 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
972 | return _param.retval; | |
4ea42b18 MH |
973 | } |
974 | ||
cd25f8bc LM |
975 | struct pubname_callback_param { |
976 | char *function; | |
977 | char *file; | |
978 | Dwarf_Die *cu_die; | |
979 | Dwarf_Die *sp_die; | |
980 | int found; | |
981 | }; | |
982 | ||
983 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
984 | { | |
985 | struct pubname_callback_param *param = data; | |
986 | ||
987 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
988 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
989 | return DWARF_CB_OK; | |
990 | ||
4c859351 | 991 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
992 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
993 | return DWARF_CB_OK; | |
994 | ||
995 | if (param->file && | |
996 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
997 | return DWARF_CB_OK; | |
998 | ||
999 | param->found = 1; | |
1000 | return DWARF_CB_ABORT; | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | return DWARF_CB_OK; | |
1005 | } | |
1006 | ||
cf6eb489 | 1007 | /* Find probe points from debuginfo */ |
316c7136 | 1008 | static int debuginfo__find_probes(struct debuginfo *dbg, |
ff741783 | 1009 | struct probe_finder *pf) |
4ea42b18 | 1010 | { |
cf6eb489 | 1011 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1012 | Dwarf_Off off, noff; |
1013 | size_t cuhl; | |
1014 | Dwarf_Die *diep; | |
b55a87ad | 1015 | int ret = 0; |
804b3606 | 1016 | |
7752f1b0 | 1017 | #if _ELFUTILS_PREREQ(0, 142) |
4093325f NK |
1018 | Elf *elf; |
1019 | GElf_Ehdr ehdr; | |
1020 | GElf_Shdr shdr; | |
1021 | ||
a34a9854 | 1022 | /* Get the call frame information from this dwarf */ |
4093325f NK |
1023 | elf = dwarf_getelf(dbg->dbg); |
1024 | if (elf == NULL) | |
1025 | return -EINVAL; | |
1026 | ||
1027 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1028 | return -EINVAL; | |
1029 | ||
1030 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1031 | shdr.sh_type == SHT_PROGBITS) { | |
1032 | pf->cfi = dwarf_getcfi_elf(elf); | |
1033 | } else { | |
1034 | pf->cfi = dwarf_getcfi(dbg->dbg); | |
1035 | } | |
7752f1b0 | 1036 | #endif |
a34a9854 | 1037 | |
804b3606 | 1038 | off = 0; |
5a62257a MH |
1039 | pf->lcache = intlist__new(NULL); |
1040 | if (!pf->lcache) | |
1041 | return -ENOMEM; | |
cd25f8bc LM |
1042 | |
1043 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1044 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1045 | struct pubname_callback_param pubname_param = { |
1046 | .function = pp->function, | |
1047 | .file = pp->file, | |
1048 | .cu_die = &pf->cu_die, | |
1049 | .sp_die = &pf->sp_die, | |
2b348a77 | 1050 | .found = 0, |
cd25f8bc LM |
1051 | }; |
1052 | struct dwarf_callback_param probe_param = { | |
1053 | .data = pf, | |
1054 | }; | |
1055 | ||
316c7136 | 1056 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1057 | &pubname_param, 0); |
cd25f8bc LM |
1058 | if (pubname_param.found) { |
1059 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1060 | if (ret) | |
1061 | goto found; | |
1062 | } | |
1063 | } | |
1064 | ||
804b3606 | 1065 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1066 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1067 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1068 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1069 | if (!diep) |
1070 | continue; | |
4ea42b18 MH |
1071 | |
1072 | /* Check if target file is included. */ | |
1073 | if (pp->file) | |
cf6eb489 | 1074 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1075 | else |
cf6eb489 | 1076 | pf->fname = NULL; |
4ea42b18 | 1077 | |
cf6eb489 | 1078 | if (!pp->file || pf->fname) { |
4ea42b18 | 1079 | if (pp->function) |
cf6eb489 | 1080 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1081 | else if (pp->lazy_line) |
f19e80c6 | 1082 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1083 | else { |
cf6eb489 MH |
1084 | pf->lno = pp->line; |
1085 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1086 | } |
8635bf6e | 1087 | if (ret < 0) |
fbee632d | 1088 | break; |
4ea42b18 | 1089 | } |
804b3606 | 1090 | off = noff; |
4ea42b18 | 1091 | } |
cd25f8bc LM |
1092 | |
1093 | found: | |
5a62257a MH |
1094 | intlist__delete(pf->lcache); |
1095 | pf->lcache = NULL; | |
4ea42b18 | 1096 | |
cf6eb489 MH |
1097 | return ret; |
1098 | } | |
1099 | ||
7969ec77 MH |
1100 | struct local_vars_finder { |
1101 | struct probe_finder *pf; | |
1102 | struct perf_probe_arg *args; | |
f8bffbf1 | 1103 | bool vars; |
7969ec77 MH |
1104 | int max_args; |
1105 | int nargs; | |
1106 | int ret; | |
1107 | }; | |
1108 | ||
1109 | /* Collect available variables in this scope */ | |
1110 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1111 | { | |
1112 | struct local_vars_finder *vf = data; | |
3d918a12 | 1113 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1114 | int tag; |
1115 | ||
1116 | tag = dwarf_tag(die_mem); | |
1117 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1118 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1119 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 MH |
1120 | vf->pf->fb_ops, &pf->sp_die, |
1121 | NULL) == 0) { | |
7969ec77 MH |
1122 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1123 | if (vf->args[vf->nargs].var == NULL) { | |
1124 | vf->ret = -ENOMEM; | |
1125 | return DIE_FIND_CB_END; | |
1126 | } | |
1127 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1128 | vf->nargs++; | |
1129 | } | |
1130 | } | |
1131 | ||
1132 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1133 | return DIE_FIND_CB_CONTINUE; | |
1134 | else | |
1135 | return DIE_FIND_CB_SIBLING; | |
1136 | } | |
1137 | ||
1138 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1139 | struct perf_probe_arg *args) | |
1140 | { | |
1141 | Dwarf_Die die_mem; | |
1142 | int i; | |
1143 | int n = 0; | |
f8bffbf1 | 1144 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1145 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1146 | ||
1147 | for (i = 0; i < pf->pev->nargs; i++) { | |
1148 | /* var never be NULL */ | |
f8bffbf1 MH |
1149 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1150 | vf.vars = true; | |
1151 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1152 | /* Copy normal argument */ |
1153 | args[n] = pf->pev->args[i]; | |
1154 | n++; | |
f8bffbf1 | 1155 | continue; |
7969ec77 | 1156 | } |
f8bffbf1 MH |
1157 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1158 | vf.nargs = n; | |
1159 | /* Special local variables */ | |
1160 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1161 | &die_mem); | |
1162 | pr_debug(" (%d)\n", vf.nargs - n); | |
1163 | if (vf.ret < 0) | |
1164 | return vf.ret; | |
1165 | n = vf.nargs; | |
7969ec77 MH |
1166 | } |
1167 | return n; | |
1168 | } | |
1169 | ||
cf6eb489 | 1170 | /* Add a found probe point into trace event list */ |
221d0611 | 1171 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1172 | { |
1173 | struct trace_event_finder *tf = | |
1174 | container_of(pf, struct trace_event_finder, pf); | |
1175 | struct probe_trace_event *tev; | |
7969ec77 | 1176 | struct perf_probe_arg *args; |
cf6eb489 MH |
1177 | int ret, i; |
1178 | ||
1179 | /* Check number of tevs */ | |
1180 | if (tf->ntevs == tf->max_tevs) { | |
1181 | pr_warning("Too many( > %d) probe point found.\n", | |
1182 | tf->max_tevs); | |
1183 | return -ERANGE; | |
1184 | } | |
1185 | tev = &tf->tevs[tf->ntevs++]; | |
1186 | ||
221d0611 | 1187 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1188 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
221d0611 | 1189 | pf->pev->point.retprobe, &tev->point); |
cf6eb489 MH |
1190 | if (ret < 0) |
1191 | return ret; | |
1192 | ||
4c859351 MH |
1193 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
1194 | if (!tev->point.realname) | |
1195 | return -ENOMEM; | |
1196 | ||
cf6eb489 MH |
1197 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1198 | tev->point.offset); | |
1199 | ||
7969ec77 MH |
1200 | /* Expand special probe argument if exist */ |
1201 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
1202 | if (args == NULL) | |
cf6eb489 | 1203 | return -ENOMEM; |
7969ec77 MH |
1204 | |
1205 | ret = expand_probe_args(sc_die, pf, args); | |
1206 | if (ret < 0) | |
1207 | goto end; | |
1208 | ||
1209 | tev->nargs = ret; | |
1210 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1211 | if (tev->args == NULL) { | |
1212 | ret = -ENOMEM; | |
1213 | goto end; | |
1214 | } | |
1215 | ||
1216 | /* Find each argument */ | |
1217 | for (i = 0; i < tev->nargs; i++) { | |
1218 | pf->pvar = &args[i]; | |
cf6eb489 | 1219 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1220 | /* Variable should be found from scope DIE */ |
1221 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1222 | if (ret != 0) |
7969ec77 | 1223 | break; |
cf6eb489 MH |
1224 | } |
1225 | ||
7969ec77 MH |
1226 | end: |
1227 | free(args); | |
1228 | return ret; | |
cf6eb489 MH |
1229 | } |
1230 | ||
1231 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
316c7136 | 1232 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1233 | struct perf_probe_event *pev, |
ddb2f58f | 1234 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1235 | { |
1236 | struct trace_event_finder tf = { | |
1237 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
ddb2f58f | 1238 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
cf6eb489 MH |
1239 | int ret; |
1240 | ||
1241 | /* Allocate result tevs array */ | |
ddb2f58f | 1242 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1243 | if (*tevs == NULL) |
1244 | return -ENOMEM; | |
1245 | ||
1246 | tf.tevs = *tevs; | |
1247 | tf.ntevs = 0; | |
1248 | ||
316c7136 | 1249 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cf6eb489 | 1250 | if (ret < 0) { |
04662523 | 1251 | zfree(tevs); |
cf6eb489 MH |
1252 | return ret; |
1253 | } | |
1254 | ||
1255 | return (ret < 0) ? ret : tf.ntevs; | |
1256 | } | |
1257 | ||
1258 | #define MAX_VAR_LEN 64 | |
1259 | ||
1260 | /* Collect available variables in this scope */ | |
1261 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1262 | { | |
1263 | struct available_var_finder *af = data; | |
1264 | struct variable_list *vl; | |
1265 | char buf[MAX_VAR_LEN]; | |
1266 | int tag, ret; | |
1267 | ||
1268 | vl = &af->vls[af->nvls - 1]; | |
1269 | ||
1270 | tag = dwarf_tag(die_mem); | |
1271 | if (tag == DW_TAG_formal_parameter || | |
1272 | tag == DW_TAG_variable) { | |
1273 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 MH |
1274 | af->pf.fb_ops, &af->pf.sp_die, |
1275 | NULL); | |
cf6eb489 MH |
1276 | if (ret == 0) { |
1277 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); | |
fb8c5a56 | 1278 | pr_debug2("Add new var: %s\n", buf); |
cf6eb489 MH |
1279 | if (ret > 0) |
1280 | strlist__add(vl->vars, buf); | |
1281 | } | |
1282 | } | |
1283 | ||
fb8c5a56 | 1284 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1285 | return DIE_FIND_CB_CONTINUE; |
1286 | else | |
1287 | return DIE_FIND_CB_SIBLING; | |
1288 | } | |
1289 | ||
1290 | /* Add a found vars into available variables list */ | |
221d0611 | 1291 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1292 | { |
1293 | struct available_var_finder *af = | |
1294 | container_of(pf, struct available_var_finder, pf); | |
1295 | struct variable_list *vl; | |
f182e3e1 MH |
1296 | Dwarf_Die die_mem; |
1297 | int ret; | |
cf6eb489 MH |
1298 | |
1299 | /* Check number of tevs */ | |
1300 | if (af->nvls == af->max_vls) { | |
1301 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1302 | return -ERANGE; | |
1303 | } | |
1304 | vl = &af->vls[af->nvls++]; | |
1305 | ||
221d0611 | 1306 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1307 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
221d0611 | 1308 | pf->pev->point.retprobe, &vl->point); |
cf6eb489 MH |
1309 | if (ret < 0) |
1310 | return ret; | |
1311 | ||
1312 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1313 | vl->point.offset); | |
1314 | ||
1315 | /* Find local variables */ | |
1316 | vl->vars = strlist__new(true, NULL); | |
1317 | if (vl->vars == NULL) | |
1318 | return -ENOMEM; | |
fb8c5a56 | 1319 | af->child = true; |
221d0611 | 1320 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1321 | |
fb8c5a56 | 1322 | /* Find external variables */ |
ddb2f58f | 1323 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1324 | goto out; |
ddb2f58f | 1325 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1326 | af->child = false; |
f182e3e1 | 1327 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1328 | |
1329 | out: | |
cf6eb489 MH |
1330 | if (strlist__empty(vl->vars)) { |
1331 | strlist__delete(vl->vars); | |
1332 | vl->vars = NULL; | |
1333 | } | |
1334 | ||
1335 | return ret; | |
1336 | } | |
1337 | ||
69e96eaa MH |
1338 | /* |
1339 | * Find available variables at given probe point | |
1340 | * Return the number of found probe points. Return 0 if there is no | |
1341 | * matched probe point. Return <0 if an error occurs. | |
1342 | */ | |
316c7136 | 1343 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1344 | struct perf_probe_event *pev, |
ddb2f58f | 1345 | struct variable_list **vls) |
cf6eb489 MH |
1346 | { |
1347 | struct available_var_finder af = { | |
1348 | .pf = {.pev = pev, .callback = add_available_vars}, | |
316c7136 | 1349 | .mod = dbg->mod, |
ddb2f58f | 1350 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1351 | int ret; |
1352 | ||
1353 | /* Allocate result vls array */ | |
ddb2f58f | 1354 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1355 | if (*vls == NULL) |
1356 | return -ENOMEM; | |
1357 | ||
1358 | af.vls = *vls; | |
1359 | af.nvls = 0; | |
1360 | ||
316c7136 | 1361 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1362 | if (ret < 0) { |
1363 | /* Free vlist for error */ | |
1364 | while (af.nvls--) { | |
74cf249d | 1365 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1366 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1367 | } |
04662523 | 1368 | zfree(vls); |
cf6eb489 MH |
1369 | return ret; |
1370 | } | |
1371 | ||
1372 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1373 | } |
1374 | ||
fb1587d8 | 1375 | /* Reverse search */ |
316c7136 | 1376 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1377 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1378 | { |
1379 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1380 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1381 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1382 | int baseline = 0, lineno = 0, ret = 0; |
fb1587d8 | 1383 | |
fb1587d8 | 1384 | /* Find cu die */ |
0104fe69 | 1385 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
0e43e5d2 MH |
1386 | pr_warning("Failed to find debug information for address %lx\n", |
1387 | addr); | |
75ec5a24 MH |
1388 | ret = -EINVAL; |
1389 | goto end; | |
1390 | } | |
fb1587d8 | 1391 | |
1d46ea2a MH |
1392 | /* Find a corresponding line (filename and lineno) */ |
1393 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1394 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1395 | |
1d46ea2a | 1396 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1397 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1398 | /* Get function entry information */ |
e08cfd4b MH |
1399 | func = basefunc = dwarf_diename(&spdie); |
1400 | if (!func || | |
1d46ea2a | 1401 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1402 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1403 | lineno = 0; | |
1d46ea2a | 1404 | goto post; |
e08cfd4b | 1405 | } |
1d46ea2a | 1406 | |
1b286bdd | 1407 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1408 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1409 | /* Function entry - Relative line number is 0 */ |
1410 | lineno = baseline; | |
e08cfd4b MH |
1411 | goto post; |
1412 | } | |
1413 | ||
1414 | /* Track down the inline functions step by step */ | |
1415 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1416 | &indie)) { | |
1417 | /* There is an inline function */ | |
1d46ea2a | 1418 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1419 | _addr == addr) { |
1d46ea2a MH |
1420 | /* |
1421 | * addr is at an inline function entry. | |
1422 | * In this case, lineno should be the call-site | |
e08cfd4b | 1423 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1424 | */ |
1425 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1426 | fname = die_get_call_file(&indie); |
1427 | break; | |
1428 | } else { | |
1d46ea2a MH |
1429 | /* |
1430 | * addr is in an inline function body. | |
1431 | * Since lineno points one of the lines | |
1432 | * of the inline function, baseline should | |
1433 | * be the entry line of the inline function. | |
1434 | */ | |
b55a87ad | 1435 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1436 | if (!tmp || |
1437 | dwarf_decl_line(&indie, &baseline) != 0) | |
1438 | break; | |
1439 | func = tmp; | |
1440 | spdie = indie; | |
b55a87ad | 1441 | } |
fb1587d8 | 1442 | } |
e08cfd4b MH |
1443 | /* Verify the lineno and baseline are in a same file */ |
1444 | tmp = dwarf_decl_file(&spdie); | |
1445 | if (!tmp || strcmp(tmp, fname) != 0) | |
1446 | lineno = 0; | |
1d46ea2a MH |
1447 | } |
1448 | ||
1449 | post: | |
1450 | /* Make a relative line number or an offset */ | |
1451 | if (lineno) | |
1452 | ppt->line = lineno - baseline; | |
e08cfd4b | 1453 | else if (basefunc) { |
1d46ea2a | 1454 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1455 | func = basefunc; |
1456 | } | |
1d46ea2a MH |
1457 | |
1458 | /* Duplicate strings */ | |
1459 | if (func) { | |
1460 | ppt->function = strdup(func); | |
02b95dad MH |
1461 | if (ppt->function == NULL) { |
1462 | ret = -ENOMEM; | |
1463 | goto end; | |
1464 | } | |
fb1587d8 | 1465 | } |
1d46ea2a MH |
1466 | if (fname) { |
1467 | ppt->file = strdup(fname); | |
1468 | if (ppt->file == NULL) { | |
04662523 | 1469 | zfree(&ppt->function); |
1d46ea2a MH |
1470 | ret = -ENOMEM; |
1471 | goto end; | |
1472 | } | |
1473 | } | |
fb1587d8 | 1474 | end: |
1d46ea2a MH |
1475 | if (ret == 0 && (fname || func)) |
1476 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1477 | return ret; |
1478 | } | |
1479 | ||
f6c903f5 MH |
1480 | /* Add a line and store the src path */ |
1481 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1482 | struct line_range *lr) | |
1483 | { | |
7cf0b79e | 1484 | /* Copy source path */ |
f6c903f5 | 1485 | if (!lr->path) { |
7cf0b79e MH |
1486 | lr->path = strdup(src); |
1487 | if (lr->path == NULL) | |
1488 | return -ENOMEM; | |
f6c903f5 | 1489 | } |
5a62257a | 1490 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1491 | } |
1492 | ||
4cc9cec6 | 1493 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1494 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1495 | void *data) |
f6c903f5 | 1496 | { |
4cc9cec6 | 1497 | struct line_finder *lf = data; |
202c7c12 | 1498 | int err; |
f6c903f5 | 1499 | |
4cc9cec6 | 1500 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1501 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1502 | return 0; |
f6c903f5 | 1503 | |
202c7c12 NK |
1504 | err = line_range_add_line(fname, lineno, lf->lr); |
1505 | if (err < 0 && err != -EEXIST) | |
1506 | return err; | |
f6c903f5 | 1507 | |
4cc9cec6 | 1508 | return 0; |
f6c903f5 | 1509 | } |
fb1587d8 | 1510 | |
631c9def | 1511 | /* Find line range from its line number */ |
b55a87ad | 1512 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1513 | { |
4cc9cec6 | 1514 | int ret; |
f6c903f5 | 1515 | |
4cc9cec6 | 1516 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1517 | |
804b3606 | 1518 | /* Update status */ |
f6c903f5 | 1519 | if (ret >= 0) |
5a62257a | 1520 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1521 | ret = lf->found = 1; |
1522 | else | |
1523 | ret = 0; /* Lines are not found */ | |
804b3606 | 1524 | else { |
04662523 | 1525 | zfree(&lf->lr->path); |
804b3606 | 1526 | } |
f6c903f5 | 1527 | return ret; |
631c9def MH |
1528 | } |
1529 | ||
161a26b0 MH |
1530 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1531 | { | |
182c228e | 1532 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1533 | |
1534 | /* | |
1535 | * We have to check all instances of inlined function, because | |
1536 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1537 | * function argument of instances. However, if an error occurs, |
1538 | * it should be handled by the caller. | |
36c0c588 | 1539 | */ |
182c228e | 1540 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1541 | } |
1542 | ||
0dbb1cac | 1543 | /* Search function definition from function name */ |
e92b85e1 | 1544 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1545 | { |
b55a87ad MH |
1546 | struct dwarf_callback_param *param = data; |
1547 | struct line_finder *lf = param->data; | |
631c9def | 1548 | struct line_range *lr = lf->lr; |
631c9def | 1549 | |
7d21635a MH |
1550 | /* Check declared file */ |
1551 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1552 | return DWARF_CB_OK; | |
1553 | ||
0dbb1cac | 1554 | if (die_is_func_def(sp_die) && |
4c859351 | 1555 | die_match_name(sp_die, lr->function)) { |
e92b85e1 MH |
1556 | lf->fname = dwarf_decl_file(sp_die); |
1557 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1558 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1559 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1560 | if (lf->lno_s < 0) /* Overflow */ |
1561 | lf->lno_s = INT_MAX; | |
1562 | lf->lno_e = lr->offset + lr->end; | |
1563 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1564 | lf->lno_e = INT_MAX; |
d3b63d7a | 1565 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1566 | lr->start = lf->lno_s; |
1567 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1568 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1569 | param->retval = die_walk_instances(sp_die, |
1570 | line_range_inline_cb, lf); | |
1571 | else | |
b55a87ad MH |
1572 | param->retval = find_line_range_by_line(sp_die, lf); |
1573 | return DWARF_CB_ABORT; | |
631c9def | 1574 | } |
b55a87ad | 1575 | return DWARF_CB_OK; |
631c9def MH |
1576 | } |
1577 | ||
b55a87ad | 1578 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1579 | { |
b55a87ad MH |
1580 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1581 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1582 | return param.retval; | |
631c9def MH |
1583 | } |
1584 | ||
316c7136 | 1585 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1586 | { |
804b3606 | 1587 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1588 | int ret = 0; |
804b3606 MH |
1589 | Dwarf_Off off = 0, noff; |
1590 | size_t cuhl; | |
1591 | Dwarf_Die *diep; | |
6a330a3c | 1592 | const char *comp_dir; |
804b3606 | 1593 | |
cd25f8bc LM |
1594 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1595 | if (lr->function) { | |
1596 | struct pubname_callback_param pubname_param = { | |
1597 | .function = lr->function, .file = lr->file, | |
1598 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1599 | struct dwarf_callback_param line_range_param = { | |
1600 | .data = (void *)&lf, .retval = 0}; | |
1601 | ||
316c7136 | 1602 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1603 | &pubname_param, 0); |
cd25f8bc LM |
1604 | if (pubname_param.found) { |
1605 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1606 | if (lf.found) | |
1607 | goto found; | |
1608 | } | |
1609 | } | |
1610 | ||
804b3606 | 1611 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1612 | while (!lf.found && ret >= 0) { |
316c7136 | 1613 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1614 | NULL, NULL, NULL) != 0) |
631c9def MH |
1615 | break; |
1616 | ||
1617 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1618 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1619 | if (!diep) |
1620 | continue; | |
631c9def MH |
1621 | |
1622 | /* Check if target file is included. */ | |
1623 | if (lr->file) | |
2a9c8c36 | 1624 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1625 | else |
2a9c8c36 | 1626 | lf.fname = 0; |
631c9def | 1627 | |
2a9c8c36 | 1628 | if (!lr->file || lf.fname) { |
631c9def | 1629 | if (lr->function) |
b55a87ad | 1630 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1631 | else { |
1632 | lf.lno_s = lr->start; | |
d3b63d7a | 1633 | lf.lno_e = lr->end; |
b55a87ad | 1634 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1635 | } |
631c9def | 1636 | } |
804b3606 | 1637 | off = noff; |
631c9def | 1638 | } |
6a330a3c | 1639 | |
cd25f8bc | 1640 | found: |
6a330a3c MH |
1641 | /* Store comp_dir */ |
1642 | if (lf.found) { | |
1643 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1644 | if (comp_dir) { | |
1645 | lr->comp_dir = strdup(comp_dir); | |
1646 | if (!lr->comp_dir) | |
1647 | ret = -ENOMEM; | |
1648 | } | |
1649 | } | |
1650 | ||
7cf0b79e | 1651 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1652 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1653 | } |
1654 | ||
09ed8975 NA |
1655 | /* |
1656 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
1657 | * and chop off leading directories that do not exist. Result is passed back as | |
1658 | * a newly allocated path on success. | |
1659 | * Return 0 if file was found and readable, -errno otherwise. | |
1660 | */ | |
1661 | int get_real_path(const char *raw_path, const char *comp_dir, | |
1662 | char **new_path) | |
1663 | { | |
1664 | const char *prefix = symbol_conf.source_prefix; | |
1665 | ||
1666 | if (!prefix) { | |
1667 | if (raw_path[0] != '/' && comp_dir) | |
1668 | /* If not an absolute path, try to use comp_dir */ | |
1669 | prefix = comp_dir; | |
1670 | else { | |
1671 | if (access(raw_path, R_OK) == 0) { | |
1672 | *new_path = strdup(raw_path); | |
1673 | return *new_path ? 0 : -ENOMEM; | |
1674 | } else | |
1675 | return -errno; | |
1676 | } | |
1677 | } | |
1678 | ||
1679 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
1680 | if (!*new_path) | |
1681 | return -ENOMEM; | |
1682 | ||
1683 | for (;;) { | |
1684 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
1685 | ||
1686 | if (access(*new_path, R_OK) == 0) | |
1687 | return 0; | |
1688 | ||
1689 | if (!symbol_conf.source_prefix) { | |
1690 | /* In case of searching comp_dir, don't retry */ | |
1691 | zfree(new_path); | |
1692 | return -errno; | |
1693 | } | |
1694 | ||
1695 | switch (errno) { | |
1696 | case ENAMETOOLONG: | |
1697 | case ENOENT: | |
1698 | case EROFS: | |
1699 | case EFAULT: | |
1700 | raw_path = strchr(++raw_path, '/'); | |
1701 | if (!raw_path) { | |
1702 | zfree(new_path); | |
1703 | return -ENOENT; | |
1704 | } | |
1705 | continue; | |
1706 | ||
1707 | default: | |
1708 | zfree(new_path); | |
1709 | return -errno; | |
1710 | } | |
1711 | } | |
1712 | } |