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Commit | Line | Data |
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4ea42b18 MH |
1 | /* |
2 | * probe-finder.c : C expression to kprobe event converter | |
3 | * | |
4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <sys/utsname.h> | |
23 | #include <sys/types.h> | |
24 | #include <sys/stat.h> | |
25 | #include <fcntl.h> | |
26 | #include <errno.h> | |
27 | #include <stdio.h> | |
28 | #include <unistd.h> | |
4ea42b18 MH |
29 | #include <stdlib.h> |
30 | #include <string.h> | |
31 | #include <stdarg.h> | |
cd932c59 | 32 | #include <dwarf-regs.h> |
074fc0e4 | 33 | |
124bb83c | 34 | #include <linux/bitops.h> |
89c69c0e | 35 | #include "event.h" |
a15ad2f5 | 36 | #include "dso.h" |
89c69c0e | 37 | #include "debug.h" |
5a62257a | 38 | #include "intlist.h" |
074fc0e4 | 39 | #include "util.h" |
9ed7e1b8 | 40 | #include "symbol.h" |
4ea42b18 MH |
41 | #include "probe-finder.h" |
42 | ||
4984912e MH |
43 | /* Kprobe tracer basic type is up to u64 */ |
44 | #define MAX_BASIC_TYPE_BITS 64 | |
45 | ||
469b9b88 | 46 | /* Dwarf FL wrappers */ |
469b9b88 MH |
47 | static char *debuginfo_path; /* Currently dummy */ |
48 | ||
49 | static const Dwfl_Callbacks offline_callbacks = { | |
50 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
51 | .debuginfo_path = &debuginfo_path, | |
52 | ||
53 | .section_address = dwfl_offline_section_address, | |
54 | ||
55 | /* We use this table for core files too. */ | |
56 | .find_elf = dwfl_build_id_find_elf, | |
57 | }; | |
58 | ||
469b9b88 | 59 | /* Get a Dwarf from offline image */ |
316c7136 | 60 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
ff741783 | 61 | const char *path) |
469b9b88 | 62 | { |
ff741783 | 63 | int fd; |
469b9b88 | 64 | |
ff741783 MH |
65 | fd = open(path, O_RDONLY); |
66 | if (fd < 0) | |
67 | return fd; | |
469b9b88 | 68 | |
316c7136 ACM |
69 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
70 | if (!dbg->dwfl) | |
ff741783 | 71 | goto error; |
469b9b88 | 72 | |
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 | } | |
d3a7c489 | 133 | dso__put(dso); |
a15ad2f5 MH |
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; |
349e8d26 | 180 | int ret, ret2 = 0; |
b7dcb857 | 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); | |
349e8d26 HK |
190 | if (ret) |
191 | return -ENOENT; | |
192 | ||
193 | if (probe_conf.show_location_range && | |
194 | (dwarf_tag(vr_die) == DW_TAG_variable)) { | |
195 | ret2 = -ERANGE; | |
196 | } else if (addr != tmp || | |
197 | dwarf_tag(vr_die) != DW_TAG_formal_parameter) { | |
198 | return -ENOENT; | |
199 | } | |
200 | ||
201 | ret = dwarf_highpc(sp_die, &tmp); | |
202 | if (ret) | |
3d918a12 MH |
203 | return -ENOENT; |
204 | /* | |
205 | * This is fuzzed by fentry mcount. We try to find the | |
206 | * parameter location at the earliest address. | |
207 | */ | |
208 | for (addr += 1; addr <= tmp; addr++) { | |
209 | if (dwarf_getlocation_addr(&attr, addr, &op, | |
210 | &nops, 1) > 0) | |
211 | goto found; | |
212 | } | |
b7dcb857 MH |
213 | return -ENOENT; |
214 | } | |
3d918a12 MH |
215 | found: |
216 | if (nops == 0) | |
217 | /* TODO: Support const_value */ | |
218 | return -ENOENT; | |
b7dcb857 MH |
219 | |
220 | if (op->atom == DW_OP_addr) { | |
632941c4 | 221 | static_var: |
cf6eb489 | 222 | if (!tvar) |
349e8d26 | 223 | return ret2; |
b7dcb857 MH |
224 | /* Static variables on memory (not stack), make @varname */ |
225 | ret = strlen(dwarf_diename(vr_die)); | |
226 | tvar->value = zalloc(ret + 2); | |
227 | if (tvar->value == NULL) | |
228 | return -ENOMEM; | |
229 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
230 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
231 | if (tvar->ref == NULL) | |
232 | return -ENOMEM; | |
349e8d26 | 233 | return ret2; |
b7dcb857 | 234 | } |
4ea42b18 | 235 | |
4ea42b18 | 236 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 237 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 238 | if (fb_ops == NULL) |
b55a87ad | 239 | return -ENOTSUP; |
4235b045 | 240 | ref = true; |
804b3606 | 241 | offs = op->number; |
cf6eb489 | 242 | op = &fb_ops[0]; |
804b3606 | 243 | } |
4ea42b18 | 244 | |
804b3606 MH |
245 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
246 | regn = op->atom - DW_OP_breg0; | |
247 | offs += op->number; | |
4235b045 | 248 | ref = true; |
804b3606 MH |
249 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
250 | regn = op->atom - DW_OP_reg0; | |
251 | } else if (op->atom == DW_OP_bregx) { | |
252 | regn = op->number; | |
253 | offs += op->number2; | |
4235b045 | 254 | ref = true; |
804b3606 MH |
255 | } else if (op->atom == DW_OP_regx) { |
256 | regn = op->number; | |
b55a87ad | 257 | } else { |
cf6eb489 | 258 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
259 | return -ENOTSUP; |
260 | } | |
4ea42b18 | 261 | |
cf6eb489 | 262 | if (!tvar) |
349e8d26 | 263 | return ret2; |
cf6eb489 | 264 | |
4ea42b18 | 265 | regs = get_arch_regstr(regn); |
b55a87ad | 266 | if (!regs) { |
cf6eb489 | 267 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
268 | pr_warning("Mapping for the register number %u " |
269 | "missing on this architecture.\n", regn); | |
349e8d26 | 270 | return -ENOTSUP; |
b55a87ad | 271 | } |
4ea42b18 | 272 | |
02b95dad MH |
273 | tvar->value = strdup(regs); |
274 | if (tvar->value == NULL) | |
275 | return -ENOMEM; | |
276 | ||
4235b045 | 277 | if (ref) { |
b7dcb857 | 278 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
279 | if (tvar->ref == NULL) |
280 | return -ENOMEM; | |
4235b045 | 281 | } |
349e8d26 | 282 | return ret2; |
4ea42b18 MH |
283 | } |
284 | ||
124bb83c MH |
285 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
286 | ||
b55a87ad | 287 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 288 | struct probe_trace_arg *tvar, |
73317b95 | 289 | const char *cast) |
4984912e | 290 | { |
0e60836b | 291 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
292 | Dwarf_Die type; |
293 | char buf[16]; | |
5f03cba4 | 294 | char sbuf[STRERR_BUFSIZE]; |
bcfc0821 | 295 | int bsize, boffs, total; |
4984912e MH |
296 | int ret; |
297 | ||
73317b95 MH |
298 | /* TODO: check all types */ |
299 | if (cast && strcmp(cast, "string") != 0) { | |
300 | /* Non string type is OK */ | |
301 | tvar->type = strdup(cast); | |
302 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
303 | } | |
304 | ||
bcfc0821 MH |
305 | bsize = dwarf_bitsize(vr_die); |
306 | if (bsize > 0) { | |
124bb83c | 307 | /* This is a bitfield */ |
bcfc0821 MH |
308 | boffs = dwarf_bitoffset(vr_die); |
309 | total = dwarf_bytesize(vr_die); | |
310 | if (boffs < 0 || total < 0) | |
311 | return -ENOENT; | |
312 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
313 | BYTES_TO_BITS(total)); | |
124bb83c MH |
314 | goto formatted; |
315 | } | |
316 | ||
b55a87ad MH |
317 | if (die_get_real_type(vr_die, &type) == NULL) { |
318 | pr_warning("Failed to get a type information of %s.\n", | |
319 | dwarf_diename(vr_die)); | |
320 | return -ENOENT; | |
321 | } | |
4984912e | 322 | |
b2a3c12b MH |
323 | pr_debug("%s type is %s.\n", |
324 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
325 | ||
73317b95 MH |
326 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
327 | ret = dwarf_tag(&type); | |
328 | if (ret != DW_TAG_pointer_type && | |
329 | ret != DW_TAG_array_type) { | |
330 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 331 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
332 | dwarf_diename(vr_die), dwarf_diename(&type)); |
333 | return -EINVAL; | |
334 | } | |
7ce28b5b HL |
335 | if (die_get_real_type(&type, &type) == NULL) { |
336 | pr_warning("Failed to get a type" | |
337 | " information.\n"); | |
338 | return -ENOENT; | |
339 | } | |
73317b95 | 340 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
341 | while (*ref_ptr) |
342 | ref_ptr = &(*ref_ptr)->next; | |
343 | /* Add new reference with offset +0 */ | |
0e60836b | 344 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
345 | if (*ref_ptr == NULL) { |
346 | pr_warning("Out of memory error\n"); | |
347 | return -ENOMEM; | |
348 | } | |
349 | } | |
82175633 MH |
350 | if (!die_compare_name(&type, "char") && |
351 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 352 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 353 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
354 | dwarf_diename(vr_die)); |
355 | return -EINVAL; | |
356 | } | |
357 | tvar->type = strdup(cast); | |
358 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
359 | } | |
360 | ||
bcfc0821 MH |
361 | ret = dwarf_bytesize(&type); |
362 | if (ret <= 0) | |
124bb83c MH |
363 | /* No size ... try to use default type */ |
364 | return 0; | |
bcfc0821 | 365 | ret = BYTES_TO_BITS(ret); |
4984912e | 366 | |
124bb83c MH |
367 | /* Check the bitwidth */ |
368 | if (ret > MAX_BASIC_TYPE_BITS) { | |
369 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
370 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
371 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 372 | } |
124bb83c MH |
373 | ret = snprintf(buf, 16, "%c%d", |
374 | die_is_signed_type(&type) ? 's' : 'u', ret); | |
375 | ||
376 | formatted: | |
377 | if (ret < 0 || ret >= 16) { | |
378 | if (ret >= 16) | |
379 | ret = -E2BIG; | |
380 | pr_warning("Failed to convert variable type: %s\n", | |
5f03cba4 | 381 | strerror_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
382 | return ret; |
383 | } | |
384 | tvar->type = strdup(buf); | |
385 | if (tvar->type == NULL) | |
386 | return -ENOMEM; | |
b55a87ad | 387 | return 0; |
4984912e MH |
388 | } |
389 | ||
b55a87ad | 390 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 391 | struct perf_probe_arg_field *field, |
0e60836b | 392 | struct probe_trace_arg_ref **ref_ptr, |
4984912e | 393 | Dwarf_Die *die_mem) |
7df2f329 | 394 | { |
0e60836b | 395 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
396 | Dwarf_Die type; |
397 | Dwarf_Word offs; | |
b2a3c12b | 398 | int ret, tag; |
7df2f329 MH |
399 | |
400 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
401 | if (die_get_real_type(vr_die, &type) == NULL) { |
402 | pr_warning("Failed to get the type of %s.\n", varname); | |
403 | return -ENOENT; | |
404 | } | |
b2a3c12b MH |
405 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
406 | tag = dwarf_tag(&type); | |
407 | ||
408 | if (field->name[0] == '[' && | |
409 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
410 | if (field->next) | |
411 | /* Save original type for next field */ | |
412 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
413 | /* Get the type of this array */ | |
414 | if (die_get_real_type(&type, &type) == NULL) { | |
415 | pr_warning("Failed to get the type of %s.\n", varname); | |
416 | return -ENOENT; | |
417 | } | |
418 | pr_debug2("Array real type: (%x)\n", | |
419 | (unsigned)dwarf_dieoffset(&type)); | |
420 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 421 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
422 | if (ref == NULL) |
423 | return -ENOMEM; | |
424 | if (*ref_ptr) | |
425 | (*ref_ptr)->next = ref; | |
426 | else | |
427 | *ref_ptr = ref; | |
428 | } | |
bcfc0821 | 429 | ref->offset += dwarf_bytesize(&type) * field->index; |
b2a3c12b MH |
430 | if (!field->next) |
431 | /* Save vr_die for converting types */ | |
432 | memcpy(die_mem, vr_die, sizeof(*die_mem)); | |
433 | goto next; | |
434 | } else if (tag == DW_TAG_pointer_type) { | |
435 | /* Check the pointer and dereference */ | |
b55a87ad MH |
436 | if (!field->ref) { |
437 | pr_err("Semantic error: %s must be referred by '->'\n", | |
438 | field->name); | |
439 | return -EINVAL; | |
440 | } | |
7df2f329 | 441 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
442 | if (die_get_real_type(&type, &type) == NULL) { |
443 | pr_warning("Failed to get the type of %s.\n", varname); | |
444 | return -ENOENT; | |
445 | } | |
12e5a7ae | 446 | /* Verify it is a data structure */ |
7b0295b3 HL |
447 | tag = dwarf_tag(&type); |
448 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
449 | pr_warning("%s is not a data structure nor an union.\n", | |
450 | varname); | |
b55a87ad MH |
451 | return -EINVAL; |
452 | } | |
12e5a7ae | 453 | |
0e60836b | 454 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
455 | if (ref == NULL) |
456 | return -ENOMEM; | |
7df2f329 MH |
457 | if (*ref_ptr) |
458 | (*ref_ptr)->next = ref; | |
459 | else | |
460 | *ref_ptr = ref; | |
461 | } else { | |
12e5a7ae | 462 | /* Verify it is a data structure */ |
7b0295b3 HL |
463 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
464 | pr_warning("%s is not a data structure nor an union.\n", | |
465 | varname); | |
b55a87ad MH |
466 | return -EINVAL; |
467 | } | |
b2a3c12b | 468 | if (field->name[0] == '[') { |
d939be3a | 469 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 470 | " nor array.\n", varname); |
b2a3c12b MH |
471 | return -EINVAL; |
472 | } | |
c7273835 MH |
473 | /* While prcessing unnamed field, we don't care about this */ |
474 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
475 | pr_err("Semantic error: %s must be referred by '.'\n", |
476 | field->name); | |
477 | return -EINVAL; | |
478 | } | |
479 | if (!ref) { | |
480 | pr_warning("Structure on a register is not " | |
481 | "supported yet.\n"); | |
482 | return -ENOTSUP; | |
483 | } | |
7df2f329 MH |
484 | } |
485 | ||
b55a87ad | 486 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 487 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
488 | dwarf_diename(&type), field->name); |
489 | return -EINVAL; | |
490 | } | |
7df2f329 MH |
491 | |
492 | /* Get the offset of the field */ | |
7b0295b3 HL |
493 | if (tag == DW_TAG_union_type) { |
494 | offs = 0; | |
495 | } else { | |
496 | ret = die_get_data_member_location(die_mem, &offs); | |
497 | if (ret < 0) { | |
498 | pr_warning("Failed to get the offset of %s.\n", | |
499 | field->name); | |
500 | return ret; | |
501 | } | |
b55a87ad | 502 | } |
7df2f329 MH |
503 | ref->offset += (long)offs; |
504 | ||
c7273835 MH |
505 | /* If this member is unnamed, we need to reuse this field */ |
506 | if (!dwarf_diename(die_mem)) | |
507 | return convert_variable_fields(die_mem, varname, field, | |
508 | &ref, die_mem); | |
509 | ||
b2a3c12b | 510 | next: |
7df2f329 MH |
511 | /* Converting next field */ |
512 | if (field->next) | |
b55a87ad | 513 | return convert_variable_fields(die_mem, field->name, |
de1439d8 | 514 | field->next, &ref, die_mem); |
b55a87ad MH |
515 | else |
516 | return 0; | |
7df2f329 MH |
517 | } |
518 | ||
4ea42b18 | 519 | /* Show a variables in kprobe event format */ |
b55a87ad | 520 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 521 | { |
4984912e | 522 | Dwarf_Die die_mem; |
4ea42b18 MH |
523 | int ret; |
524 | ||
b7dcb857 MH |
525 | pr_debug("Converting variable %s into trace event.\n", |
526 | dwarf_diename(vr_die)); | |
804b3606 | 527 | |
cf6eb489 | 528 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
3d918a12 | 529 | &pf->sp_die, pf->tvar); |
7d5eaba9 HK |
530 | if (ret == -ENOENT || ret == -EINVAL) { |
531 | pr_err("Failed to find the location of the '%s' variable at this address.\n" | |
532 | " Perhaps it has been optimized out.\n" | |
533 | " Use -V with the --range option to show '%s' location range.\n", | |
534 | pf->pvar->var, pf->pvar->var); | |
535 | } else if (ret == -ENOTSUP) | |
cf6eb489 | 536 | pr_err("Sorry, we don't support this variable location yet.\n"); |
0c188a07 | 537 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
538 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
539 | pf->pvar->field, &pf->tvar->ref, | |
540 | &die_mem); | |
4984912e MH |
541 | vr_die = &die_mem; |
542 | } | |
73317b95 MH |
543 | if (ret == 0) |
544 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); | |
804b3606 | 545 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 546 | return ret; |
4ea42b18 MH |
547 | } |
548 | ||
221d0611 MH |
549 | /* Find a variable in a scope DIE */ |
550 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 551 | { |
f182e3e1 | 552 | Dwarf_Die vr_die; |
11a1ca35 | 553 | char buf[32], *ptr; |
f182e3e1 | 554 | int ret = 0; |
4ea42b18 | 555 | |
367e94c1 MH |
556 | if (!is_c_varname(pf->pvar->var)) { |
557 | /* Copy raw parameters */ | |
558 | pf->tvar->value = strdup(pf->pvar->var); | |
559 | if (pf->tvar->value == NULL) | |
560 | return -ENOMEM; | |
561 | if (pf->pvar->type) { | |
562 | pf->tvar->type = strdup(pf->pvar->type); | |
563 | if (pf->tvar->type == NULL) | |
564 | return -ENOMEM; | |
565 | } | |
566 | if (pf->pvar->name) { | |
567 | pf->tvar->name = strdup(pf->pvar->name); | |
568 | if (pf->tvar->name == NULL) | |
569 | return -ENOMEM; | |
570 | } else | |
571 | pf->tvar->name = NULL; | |
572 | return 0; | |
573 | } | |
574 | ||
48481938 | 575 | if (pf->pvar->name) |
02b95dad | 576 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 577 | else { |
02b95dad MH |
578 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
579 | if (ret < 0) | |
580 | return ret; | |
11a1ca35 MH |
581 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
582 | if (ptr) | |
583 | *ptr = '_'; | |
02b95dad | 584 | pf->tvar->name = strdup(buf); |
48481938 | 585 | } |
02b95dad MH |
586 | if (pf->tvar->name == NULL) |
587 | return -ENOMEM; | |
48481938 | 588 | |
f182e3e1 | 589 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 590 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
591 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
592 | /* Search again in global variables */ | |
d13855ef HK |
593 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
594 | 0, &vr_die)) { | |
36d789a4 MH |
595 | pr_warning("Failed to find '%s' in this function.\n", |
596 | pf->pvar->var); | |
f182e3e1 | 597 | ret = -ENOENT; |
d13855ef | 598 | } |
b7dcb857 | 599 | } |
f66fedcb | 600 | if (ret >= 0) |
f182e3e1 MH |
601 | ret = convert_variable(&vr_die, pf); |
602 | ||
b7dcb857 | 603 | return ret; |
4ea42b18 MH |
604 | } |
605 | ||
cf6eb489 | 606 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
607 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
608 | Dwarf_Addr paddr, bool retprobe, | |
609 | struct probe_trace_point *tp) | |
4ea42b18 | 610 | { |
26b79524 | 611 | Dwarf_Addr eaddr, highaddr; |
576b5237 MH |
612 | GElf_Sym sym; |
613 | const char *symbol; | |
614 | ||
615 | /* Verify the address is correct */ | |
616 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { | |
617 | pr_warning("Failed to get entry address of %s\n", | |
618 | dwarf_diename(sp_die)); | |
619 | return -ENOENT; | |
620 | } | |
621 | if (dwarf_highpc(sp_die, &highaddr) != 0) { | |
622 | pr_warning("Failed to get end address of %s\n", | |
623 | dwarf_diename(sp_die)); | |
624 | return -ENOENT; | |
625 | } | |
626 | if (paddr > highaddr) { | |
627 | pr_warning("Offset specified is greater than size of %s\n", | |
628 | dwarf_diename(sp_die)); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
664fee3d | 632 | symbol = dwarf_diename(sp_die); |
576b5237 | 633 | if (!symbol) { |
664fee3d MH |
634 | /* Try to get the symbol name from symtab */ |
635 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
636 | if (!symbol) { | |
637 | pr_warning("Failed to find symbol at 0x%lx\n", | |
638 | (unsigned long)paddr); | |
639 | return -ENOENT; | |
640 | } | |
641 | eaddr = sym.st_value; | |
576b5237 | 642 | } |
664fee3d | 643 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 644 | tp->address = (unsigned long)paddr; |
576b5237 MH |
645 | tp->symbol = strdup(symbol); |
646 | if (!tp->symbol) | |
647 | return -ENOMEM; | |
4235b045 | 648 | |
04ddd04b | 649 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
650 | if (retprobe) { |
651 | if (eaddr != paddr) { | |
04ddd04b | 652 | pr_warning("Return probe must be on the head of" |
0e43e5d2 | 653 | " a real function.\n"); |
04ddd04b MH |
654 | return -EINVAL; |
655 | } | |
cf6eb489 | 656 | tp->retprobe = true; |
04ddd04b MH |
657 | } |
658 | ||
cf6eb489 MH |
659 | return 0; |
660 | } | |
661 | ||
221d0611 MH |
662 | /* Call probe_finder callback with scope DIE */ |
663 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 664 | { |
cf6eb489 MH |
665 | Dwarf_Attribute fb_attr; |
666 | size_t nops; | |
667 | int ret; | |
668 | ||
221d0611 MH |
669 | if (!sc_die) { |
670 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
671 | return -EINVAL; | |
672 | } | |
673 | ||
674 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 675 | if (!die_is_func_def(sc_die)) { |
221d0611 | 676 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
d4c537e6 NR |
677 | if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
678 | pr_warning("Ignoring tail call from %s\n", | |
679 | dwarf_diename(&pf->sp_die)); | |
680 | return 0; | |
681 | } else { | |
682 | pr_warning("Failed to find probe point in any " | |
683 | "functions.\n"); | |
684 | return -ENOENT; | |
685 | } | |
cf6eb489 | 686 | } |
221d0611 MH |
687 | } else |
688 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 689 | |
221d0611 MH |
690 | /* Get the frame base attribute/ops from subprogram */ |
691 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 692 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 693 | if (ret <= 0 || nops == 0) { |
804b3606 | 694 | pf->fb_ops = NULL; |
7752f1b0 | 695 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 MH |
696 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
697 | pf->cfi != NULL) { | |
698 | Dwarf_Frame *frame; | |
b55a87ad MH |
699 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
700 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { | |
0e43e5d2 | 701 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad MH |
702 | (uintmax_t)pf->addr); |
703 | return -ENOENT; | |
704 | } | |
7752f1b0 | 705 | #endif |
a34a9854 | 706 | } |
804b3606 | 707 | |
cf6eb489 | 708 | /* Call finder's callback handler */ |
221d0611 | 709 | ret = pf->callback(sc_die, pf); |
804b3606 MH |
710 | |
711 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ | |
712 | pf->fb_ops = NULL; | |
cf6eb489 MH |
713 | |
714 | return ret; | |
4ea42b18 MH |
715 | } |
716 | ||
221d0611 MH |
717 | struct find_scope_param { |
718 | const char *function; | |
719 | const char *file; | |
720 | int line; | |
721 | int diff; | |
722 | Dwarf_Die *die_mem; | |
723 | bool found; | |
724 | }; | |
725 | ||
726 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
727 | { | |
728 | struct find_scope_param *fsp = data; | |
729 | const char *file; | |
730 | int lno; | |
731 | ||
732 | /* Skip if declared file name does not match */ | |
733 | if (fsp->file) { | |
734 | file = dwarf_decl_file(fn_die); | |
735 | if (!file || strcmp(fsp->file, file) != 0) | |
736 | return 0; | |
737 | } | |
738 | /* If the function name is given, that's what user expects */ | |
739 | if (fsp->function) { | |
4c859351 | 740 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
741 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
742 | fsp->found = true; | |
743 | return 1; | |
744 | } | |
745 | } else { | |
746 | /* With the line number, find the nearest declared DIE */ | |
747 | dwarf_decl_line(fn_die, &lno); | |
748 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
749 | /* Keep a candidate and continue */ | |
750 | fsp->diff = fsp->line - lno; | |
751 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
752 | fsp->found = true; | |
753 | } | |
754 | } | |
755 | return 0; | |
756 | } | |
757 | ||
758 | /* Find an appropriate scope fits to given conditions */ | |
759 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
760 | { | |
761 | struct find_scope_param fsp = { | |
762 | .function = pf->pev->point.function, | |
763 | .file = pf->fname, | |
764 | .line = pf->lno, | |
765 | .diff = INT_MAX, | |
766 | .die_mem = die_mem, | |
767 | .found = false, | |
768 | }; | |
769 | ||
770 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); | |
771 | ||
772 | return fsp.found ? die_mem : NULL; | |
773 | } | |
774 | ||
4cc9cec6 MH |
775 | static int probe_point_line_walker(const char *fname, int lineno, |
776 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 777 | { |
4cc9cec6 | 778 | struct probe_finder *pf = data; |
221d0611 | 779 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 780 | int ret; |
4ea42b18 | 781 | |
4cc9cec6 MH |
782 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
783 | return 0; | |
4ea42b18 | 784 | |
4cc9cec6 | 785 | pf->addr = addr; |
221d0611 MH |
786 | sc_die = find_best_scope(pf, &die_mem); |
787 | if (!sc_die) { | |
788 | pr_warning("Failed to find scope of probe point.\n"); | |
789 | return -ENOENT; | |
790 | } | |
791 | ||
792 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 793 | |
4cc9cec6 | 794 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 795 | return ret < 0 ? ret : 0; |
4cc9cec6 | 796 | } |
804b3606 | 797 | |
4cc9cec6 MH |
798 | /* Find probe point from its line number */ |
799 | static int find_probe_point_by_line(struct probe_finder *pf) | |
800 | { | |
801 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
802 | } |
803 | ||
2a9c8c36 | 804 | /* Find lines which match lazy pattern */ |
5a62257a | 805 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
806 | const char *fname, const char *pat) |
807 | { | |
f50c2169 FBH |
808 | FILE *fp; |
809 | char *line = NULL; | |
810 | size_t line_len; | |
811 | ssize_t len; | |
812 | int count = 0, linenum = 1; | |
5f03cba4 | 813 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
814 | |
815 | fp = fopen(fname, "r"); | |
816 | if (!fp) { | |
5f03cba4 MH |
817 | pr_warning("Failed to open %s: %s\n", fname, |
818 | strerror_r(errno, sbuf, sizeof(sbuf))); | |
b448c4b6 | 819 | return -errno; |
b55a87ad MH |
820 | } |
821 | ||
f50c2169 | 822 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 823 | |
f50c2169 FBH |
824 | if (line[len - 1] == '\n') |
825 | line[len - 1] = '\0'; | |
826 | ||
827 | if (strlazymatch(line, pat)) { | |
5a62257a | 828 | intlist__add(list, linenum); |
f50c2169 | 829 | count++; |
2a9c8c36 | 830 | } |
f50c2169 | 831 | linenum++; |
2a9c8c36 | 832 | } |
f50c2169 FBH |
833 | |
834 | if (ferror(fp)) | |
835 | count = -errno; | |
836 | free(line); | |
837 | fclose(fp); | |
838 | ||
839 | if (count == 0) | |
840 | pr_debug("No matched lines found in %s.\n", fname); | |
841 | return count; | |
2a9c8c36 MH |
842 | } |
843 | ||
4cc9cec6 MH |
844 | static int probe_point_lazy_walker(const char *fname, int lineno, |
845 | Dwarf_Addr addr, void *data) | |
846 | { | |
847 | struct probe_finder *pf = data; | |
221d0611 | 848 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
849 | int ret; |
850 | ||
5a62257a | 851 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
852 | strtailcmp(fname, pf->fname) != 0) |
853 | return 0; | |
854 | ||
855 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
856 | lineno, (unsigned long long)addr); | |
857 | pf->addr = addr; | |
221d0611 MH |
858 | pf->lno = lineno; |
859 | sc_die = find_best_scope(pf, &die_mem); | |
860 | if (!sc_die) { | |
861 | pr_warning("Failed to find scope of probe point.\n"); | |
862 | return -ENOENT; | |
863 | } | |
864 | ||
865 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
866 | |
867 | /* | |
868 | * Continue if no error, because the lazy pattern will match | |
869 | * to other lines | |
870 | */ | |
5e814dd5 | 871 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
872 | } |
873 | ||
2a9c8c36 | 874 | /* Find probe points from lazy pattern */ |
b55a87ad | 875 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 876 | { |
b55a87ad | 877 | int ret = 0; |
09ed8975 | 878 | char *fpath; |
2a9c8c36 | 879 | |
5a62257a | 880 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
881 | const char *comp_dir; |
882 | ||
883 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
884 | ret = get_real_path(pf->fname, comp_dir, &fpath); | |
885 | if (ret < 0) { | |
886 | pr_warning("Failed to find source file path.\n"); | |
887 | return ret; | |
888 | } | |
889 | ||
2a9c8c36 | 890 | /* Matching lazy line pattern */ |
09ed8975 | 891 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 892 | pf->pev->point.lazy_line); |
09ed8975 | 893 | free(fpath); |
f50c2169 | 894 | if (ret <= 0) |
b55a87ad | 895 | return ret; |
2a9c8c36 MH |
896 | } |
897 | ||
4cc9cec6 | 898 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
899 | } |
900 | ||
e92b85e1 MH |
901 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
902 | { | |
db0d2c64 | 903 | struct probe_finder *pf = data; |
4235b045 | 904 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 905 | Dwarf_Addr addr; |
db0d2c64 | 906 | int ret; |
e92b85e1 | 907 | |
2a9c8c36 | 908 | if (pp->lazy_line) |
db0d2c64 | 909 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
910 | else { |
911 | /* Get probe address */ | |
b55a87ad | 912 | if (dwarf_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 913 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 914 | dwarf_diename(in_die)); |
db0d2c64 | 915 | return -ENOENT; |
b55a87ad MH |
916 | } |
917 | pf->addr = addr; | |
2a9c8c36 MH |
918 | pf->addr += pp->offset; |
919 | pr_debug("found inline addr: 0x%jx\n", | |
920 | (uintmax_t)pf->addr); | |
921 | ||
db0d2c64 | 922 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 923 | } |
e92b85e1 | 924 | |
db0d2c64 | 925 | return ret; |
e92b85e1 | 926 | } |
804b3606 | 927 | |
db0d2c64 MH |
928 | /* Callback parameter with return value for libdw */ |
929 | struct dwarf_callback_param { | |
930 | void *data; | |
931 | int retval; | |
932 | }; | |
933 | ||
4ea42b18 | 934 | /* Search function from function name */ |
e92b85e1 | 935 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 936 | { |
b55a87ad MH |
937 | struct dwarf_callback_param *param = data; |
938 | struct probe_finder *pf = param->data; | |
4235b045 | 939 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 940 | |
e92b85e1 | 941 | /* Check tag and diename */ |
0dbb1cac | 942 | if (!die_is_func_def(sp_die) || |
4c859351 | 943 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 944 | return DWARF_CB_OK; |
e92b85e1 | 945 | |
7d21635a MH |
946 | /* Check declared file */ |
947 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
948 | return DWARF_CB_OK; | |
949 | ||
4c859351 | 950 | pr_debug("Matched function: %s\n", dwarf_diename(sp_die)); |
2a9c8c36 | 951 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 952 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
953 | dwarf_decl_line(sp_die, &pf->lno); |
954 | pf->lno += pp->line; | |
b55a87ad | 955 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
956 | } else if (die_is_func_instance(sp_die)) { |
957 | /* Instances always have the entry address */ | |
958 | dwarf_entrypc(sp_die, &pf->addr); | |
e92b85e1 | 959 | /* Real function */ |
2a9c8c36 | 960 | if (pp->lazy_line) |
b55a87ad | 961 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 962 | else { |
2a9c8c36 MH |
963 | pf->addr += pp->offset; |
964 | /* TODO: Check the address in this function */ | |
cf6eb489 | 965 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 966 | } |
4c859351 | 967 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 968 | /* Inlined function: search instances */ |
db0d2c64 MH |
969 | param->retval = die_walk_instances(sp_die, |
970 | probe_point_inline_cb, (void *)pf); | |
4c859351 MH |
971 | /* This could be a non-existed inline definition */ |
972 | if (param->retval == -ENOENT && strisglob(pp->function)) | |
973 | param->retval = 0; | |
974 | } | |
975 | ||
976 | /* We need to find other candidates */ | |
977 | if (strisglob(pp->function) && param->retval >= 0) { | |
978 | param->retval = 0; /* We have to clear the result */ | |
979 | return DWARF_CB_OK; | |
980 | } | |
e92b85e1 | 981 | |
b55a87ad | 982 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
983 | } |
984 | ||
b55a87ad | 985 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 986 | { |
b55a87ad MH |
987 | struct dwarf_callback_param _param = {.data = (void *)pf, |
988 | .retval = 0}; | |
989 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
990 | return _param.retval; | |
4ea42b18 MH |
991 | } |
992 | ||
cd25f8bc LM |
993 | struct pubname_callback_param { |
994 | char *function; | |
995 | char *file; | |
996 | Dwarf_Die *cu_die; | |
997 | Dwarf_Die *sp_die; | |
998 | int found; | |
999 | }; | |
1000 | ||
1001 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1002 | { | |
1003 | struct pubname_callback_param *param = data; | |
1004 | ||
1005 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1006 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1007 | return DWARF_CB_OK; | |
1008 | ||
4c859351 | 1009 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
1010 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
1011 | return DWARF_CB_OK; | |
1012 | ||
1013 | if (param->file && | |
1014 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1015 | return DWARF_CB_OK; | |
1016 | ||
1017 | param->found = 1; | |
1018 | return DWARF_CB_ABORT; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | return DWARF_CB_OK; | |
1023 | } | |
1024 | ||
cf6eb489 | 1025 | /* Find probe points from debuginfo */ |
316c7136 | 1026 | static int debuginfo__find_probes(struct debuginfo *dbg, |
ff741783 | 1027 | struct probe_finder *pf) |
4ea42b18 | 1028 | { |
cf6eb489 | 1029 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1030 | Dwarf_Off off, noff; |
1031 | size_t cuhl; | |
1032 | Dwarf_Die *diep; | |
b55a87ad | 1033 | int ret = 0; |
804b3606 | 1034 | |
7752f1b0 | 1035 | #if _ELFUTILS_PREREQ(0, 142) |
4093325f NK |
1036 | Elf *elf; |
1037 | GElf_Ehdr ehdr; | |
1038 | GElf_Shdr shdr; | |
1039 | ||
a34a9854 | 1040 | /* Get the call frame information from this dwarf */ |
4093325f NK |
1041 | elf = dwarf_getelf(dbg->dbg); |
1042 | if (elf == NULL) | |
1043 | return -EINVAL; | |
1044 | ||
1045 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1046 | return -EINVAL; | |
1047 | ||
1048 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1049 | shdr.sh_type == SHT_PROGBITS) { | |
1050 | pf->cfi = dwarf_getcfi_elf(elf); | |
1051 | } else { | |
1052 | pf->cfi = dwarf_getcfi(dbg->dbg); | |
1053 | } | |
7752f1b0 | 1054 | #endif |
a34a9854 | 1055 | |
804b3606 | 1056 | off = 0; |
5a62257a MH |
1057 | pf->lcache = intlist__new(NULL); |
1058 | if (!pf->lcache) | |
1059 | return -ENOMEM; | |
cd25f8bc LM |
1060 | |
1061 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1062 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1063 | struct pubname_callback_param pubname_param = { |
1064 | .function = pp->function, | |
1065 | .file = pp->file, | |
1066 | .cu_die = &pf->cu_die, | |
1067 | .sp_die = &pf->sp_die, | |
2b348a77 | 1068 | .found = 0, |
cd25f8bc LM |
1069 | }; |
1070 | struct dwarf_callback_param probe_param = { | |
1071 | .data = pf, | |
1072 | }; | |
1073 | ||
316c7136 | 1074 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1075 | &pubname_param, 0); |
cd25f8bc LM |
1076 | if (pubname_param.found) { |
1077 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1078 | if (ret) | |
1079 | goto found; | |
1080 | } | |
1081 | } | |
1082 | ||
804b3606 | 1083 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1084 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1085 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1086 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1087 | if (!diep) |
1088 | continue; | |
4ea42b18 MH |
1089 | |
1090 | /* Check if target file is included. */ | |
1091 | if (pp->file) | |
cf6eb489 | 1092 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1093 | else |
cf6eb489 | 1094 | pf->fname = NULL; |
4ea42b18 | 1095 | |
cf6eb489 | 1096 | if (!pp->file || pf->fname) { |
4ea42b18 | 1097 | if (pp->function) |
cf6eb489 | 1098 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1099 | else if (pp->lazy_line) |
f19e80c6 | 1100 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1101 | else { |
cf6eb489 MH |
1102 | pf->lno = pp->line; |
1103 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1104 | } |
8635bf6e | 1105 | if (ret < 0) |
fbee632d | 1106 | break; |
4ea42b18 | 1107 | } |
804b3606 | 1108 | off = noff; |
4ea42b18 | 1109 | } |
cd25f8bc LM |
1110 | |
1111 | found: | |
5a62257a MH |
1112 | intlist__delete(pf->lcache); |
1113 | pf->lcache = NULL; | |
4ea42b18 | 1114 | |
cf6eb489 MH |
1115 | return ret; |
1116 | } | |
1117 | ||
7969ec77 MH |
1118 | struct local_vars_finder { |
1119 | struct probe_finder *pf; | |
1120 | struct perf_probe_arg *args; | |
f8bffbf1 | 1121 | bool vars; |
7969ec77 MH |
1122 | int max_args; |
1123 | int nargs; | |
1124 | int ret; | |
1125 | }; | |
1126 | ||
1127 | /* Collect available variables in this scope */ | |
1128 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1129 | { | |
1130 | struct local_vars_finder *vf = data; | |
3d918a12 | 1131 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1132 | int tag; |
1133 | ||
1134 | tag = dwarf_tag(die_mem); | |
1135 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1136 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1137 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 MH |
1138 | vf->pf->fb_ops, &pf->sp_die, |
1139 | NULL) == 0) { | |
7969ec77 MH |
1140 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1141 | if (vf->args[vf->nargs].var == NULL) { | |
1142 | vf->ret = -ENOMEM; | |
1143 | return DIE_FIND_CB_END; | |
1144 | } | |
1145 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1146 | vf->nargs++; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1151 | return DIE_FIND_CB_CONTINUE; | |
1152 | else | |
1153 | return DIE_FIND_CB_SIBLING; | |
1154 | } | |
1155 | ||
1156 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1157 | struct perf_probe_arg *args) | |
1158 | { | |
1159 | Dwarf_Die die_mem; | |
1160 | int i; | |
1161 | int n = 0; | |
f8bffbf1 | 1162 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1163 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1164 | ||
1165 | for (i = 0; i < pf->pev->nargs; i++) { | |
1166 | /* var never be NULL */ | |
f8bffbf1 MH |
1167 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1168 | vf.vars = true; | |
1169 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1170 | /* Copy normal argument */ |
1171 | args[n] = pf->pev->args[i]; | |
1172 | n++; | |
f8bffbf1 | 1173 | continue; |
7969ec77 | 1174 | } |
f8bffbf1 MH |
1175 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1176 | vf.nargs = n; | |
1177 | /* Special local variables */ | |
1178 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1179 | &die_mem); | |
1180 | pr_debug(" (%d)\n", vf.nargs - n); | |
1181 | if (vf.ret < 0) | |
1182 | return vf.ret; | |
1183 | n = vf.nargs; | |
7969ec77 MH |
1184 | } |
1185 | return n; | |
1186 | } | |
1187 | ||
cf6eb489 | 1188 | /* Add a found probe point into trace event list */ |
221d0611 | 1189 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1190 | { |
1191 | struct trace_event_finder *tf = | |
1192 | container_of(pf, struct trace_event_finder, pf); | |
1193 | struct probe_trace_event *tev; | |
7969ec77 | 1194 | struct perf_probe_arg *args; |
cf6eb489 MH |
1195 | int ret, i; |
1196 | ||
1197 | /* Check number of tevs */ | |
1198 | if (tf->ntevs == tf->max_tevs) { | |
1199 | pr_warning("Too many( > %d) probe point found.\n", | |
1200 | tf->max_tevs); | |
1201 | return -ERANGE; | |
1202 | } | |
1203 | tev = &tf->tevs[tf->ntevs++]; | |
1204 | ||
221d0611 | 1205 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1206 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
221d0611 | 1207 | pf->pev->point.retprobe, &tev->point); |
cf6eb489 MH |
1208 | if (ret < 0) |
1209 | return ret; | |
1210 | ||
4c859351 MH |
1211 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
1212 | if (!tev->point.realname) | |
1213 | return -ENOMEM; | |
1214 | ||
cf6eb489 MH |
1215 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1216 | tev->point.offset); | |
1217 | ||
7969ec77 MH |
1218 | /* Expand special probe argument if exist */ |
1219 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
1220 | if (args == NULL) | |
cf6eb489 | 1221 | return -ENOMEM; |
7969ec77 MH |
1222 | |
1223 | ret = expand_probe_args(sc_die, pf, args); | |
1224 | if (ret < 0) | |
1225 | goto end; | |
1226 | ||
1227 | tev->nargs = ret; | |
1228 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1229 | if (tev->args == NULL) { | |
1230 | ret = -ENOMEM; | |
1231 | goto end; | |
1232 | } | |
1233 | ||
1234 | /* Find each argument */ | |
1235 | for (i = 0; i < tev->nargs; i++) { | |
1236 | pf->pvar = &args[i]; | |
cf6eb489 | 1237 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1238 | /* Variable should be found from scope DIE */ |
1239 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1240 | if (ret != 0) |
7969ec77 | 1241 | break; |
cf6eb489 MH |
1242 | } |
1243 | ||
7969ec77 MH |
1244 | end: |
1245 | free(args); | |
1246 | return ret; | |
cf6eb489 MH |
1247 | } |
1248 | ||
1249 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ | |
316c7136 | 1250 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1251 | struct perf_probe_event *pev, |
ddb2f58f | 1252 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1253 | { |
1254 | struct trace_event_finder tf = { | |
1255 | .pf = {.pev = pev, .callback = add_probe_trace_event}, | |
ddb2f58f | 1256 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
cf6eb489 MH |
1257 | int ret; |
1258 | ||
1259 | /* Allocate result tevs array */ | |
ddb2f58f | 1260 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1261 | if (*tevs == NULL) |
1262 | return -ENOMEM; | |
1263 | ||
1264 | tf.tevs = *tevs; | |
1265 | tf.ntevs = 0; | |
1266 | ||
316c7136 | 1267 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cf6eb489 | 1268 | if (ret < 0) { |
04662523 | 1269 | zfree(tevs); |
cf6eb489 MH |
1270 | return ret; |
1271 | } | |
1272 | ||
1273 | return (ret < 0) ? ret : tf.ntevs; | |
1274 | } | |
1275 | ||
cf6eb489 MH |
1276 | /* Collect available variables in this scope */ |
1277 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1278 | { | |
1279 | struct available_var_finder *af = data; | |
1280 | struct variable_list *vl; | |
cf6eb489 MH |
1281 | int tag, ret; |
1282 | ||
1283 | vl = &af->vls[af->nvls - 1]; | |
1284 | ||
1285 | tag = dwarf_tag(die_mem); | |
1286 | if (tag == DW_TAG_formal_parameter || | |
1287 | tag == DW_TAG_variable) { | |
1288 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 MH |
1289 | af->pf.fb_ops, &af->pf.sp_die, |
1290 | NULL); | |
349e8d26 HK |
1291 | if (ret == 0 || ret == -ERANGE) { |
1292 | int ret2; | |
1293 | bool externs = !af->child; | |
fb9596d1 HK |
1294 | struct strbuf buf; |
1295 | ||
1296 | strbuf_init(&buf, 64); | |
349e8d26 HK |
1297 | |
1298 | if (probe_conf.show_location_range) { | |
1299 | if (!externs) { | |
1300 | if (ret) | |
1301 | strbuf_addf(&buf, "[INV]\t"); | |
1302 | else | |
1303 | strbuf_addf(&buf, "[VAL]\t"); | |
1304 | } else | |
1305 | strbuf_addf(&buf, "[EXT]\t"); | |
1306 | } | |
1307 | ||
1308 | ret2 = die_get_varname(die_mem, &buf); | |
1309 | ||
1310 | if (!ret2 && probe_conf.show_location_range && | |
1311 | !externs) { | |
1312 | strbuf_addf(&buf, "\t"); | |
1313 | ret2 = die_get_var_range(&af->pf.sp_die, | |
1314 | die_mem, &buf); | |
1315 | } | |
1316 | ||
1317 | pr_debug("Add new var: %s\n", buf.buf); | |
1318 | if (ret2 == 0) { | |
fb9596d1 HK |
1319 | strlist__add(vl->vars, |
1320 | strbuf_detach(&buf, NULL)); | |
1321 | } | |
1322 | strbuf_release(&buf); | |
cf6eb489 MH |
1323 | } |
1324 | } | |
1325 | ||
fb8c5a56 | 1326 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1327 | return DIE_FIND_CB_CONTINUE; |
1328 | else | |
1329 | return DIE_FIND_CB_SIBLING; | |
1330 | } | |
1331 | ||
1332 | /* Add a found vars into available variables list */ | |
221d0611 | 1333 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1334 | { |
1335 | struct available_var_finder *af = | |
1336 | container_of(pf, struct available_var_finder, pf); | |
1337 | struct variable_list *vl; | |
f182e3e1 MH |
1338 | Dwarf_Die die_mem; |
1339 | int ret; | |
cf6eb489 MH |
1340 | |
1341 | /* Check number of tevs */ | |
1342 | if (af->nvls == af->max_vls) { | |
1343 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1344 | return -ERANGE; | |
1345 | } | |
1346 | vl = &af->vls[af->nvls++]; | |
1347 | ||
221d0611 | 1348 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1349 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
221d0611 | 1350 | pf->pev->point.retprobe, &vl->point); |
cf6eb489 MH |
1351 | if (ret < 0) |
1352 | return ret; | |
1353 | ||
1354 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1355 | vl->point.offset); | |
1356 | ||
1357 | /* Find local variables */ | |
1358 | vl->vars = strlist__new(true, NULL); | |
1359 | if (vl->vars == NULL) | |
1360 | return -ENOMEM; | |
fb8c5a56 | 1361 | af->child = true; |
221d0611 | 1362 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1363 | |
fb8c5a56 | 1364 | /* Find external variables */ |
ddb2f58f | 1365 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1366 | goto out; |
ddb2f58f | 1367 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1368 | af->child = false; |
f182e3e1 | 1369 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1370 | |
1371 | out: | |
cf6eb489 MH |
1372 | if (strlist__empty(vl->vars)) { |
1373 | strlist__delete(vl->vars); | |
1374 | vl->vars = NULL; | |
1375 | } | |
1376 | ||
1377 | return ret; | |
1378 | } | |
1379 | ||
69e96eaa MH |
1380 | /* |
1381 | * Find available variables at given probe point | |
1382 | * Return the number of found probe points. Return 0 if there is no | |
1383 | * matched probe point. Return <0 if an error occurs. | |
1384 | */ | |
316c7136 | 1385 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1386 | struct perf_probe_event *pev, |
ddb2f58f | 1387 | struct variable_list **vls) |
cf6eb489 MH |
1388 | { |
1389 | struct available_var_finder af = { | |
1390 | .pf = {.pev = pev, .callback = add_available_vars}, | |
316c7136 | 1391 | .mod = dbg->mod, |
ddb2f58f | 1392 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1393 | int ret; |
1394 | ||
1395 | /* Allocate result vls array */ | |
ddb2f58f | 1396 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1397 | if (*vls == NULL) |
1398 | return -ENOMEM; | |
1399 | ||
1400 | af.vls = *vls; | |
1401 | af.nvls = 0; | |
1402 | ||
316c7136 | 1403 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1404 | if (ret < 0) { |
1405 | /* Free vlist for error */ | |
1406 | while (af.nvls--) { | |
74cf249d | 1407 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1408 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1409 | } |
04662523 | 1410 | zfree(vls); |
cf6eb489 MH |
1411 | return ret; |
1412 | } | |
1413 | ||
1414 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1415 | } |
1416 | ||
fb1587d8 | 1417 | /* Reverse search */ |
316c7136 | 1418 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1419 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1420 | { |
1421 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1422 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1423 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1424 | int baseline = 0, lineno = 0, ret = 0; |
fb1587d8 | 1425 | |
fb1587d8 | 1426 | /* Find cu die */ |
0104fe69 | 1427 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
0e43e5d2 MH |
1428 | pr_warning("Failed to find debug information for address %lx\n", |
1429 | addr); | |
75ec5a24 MH |
1430 | ret = -EINVAL; |
1431 | goto end; | |
1432 | } | |
fb1587d8 | 1433 | |
1d46ea2a MH |
1434 | /* Find a corresponding line (filename and lineno) */ |
1435 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1436 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1437 | |
1d46ea2a | 1438 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1439 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1440 | /* Get function entry information */ |
e08cfd4b MH |
1441 | func = basefunc = dwarf_diename(&spdie); |
1442 | if (!func || | |
1d46ea2a | 1443 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1444 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1445 | lineno = 0; | |
1d46ea2a | 1446 | goto post; |
e08cfd4b | 1447 | } |
1d46ea2a | 1448 | |
1b286bdd | 1449 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1450 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1451 | /* Function entry - Relative line number is 0 */ |
1452 | lineno = baseline; | |
e08cfd4b MH |
1453 | goto post; |
1454 | } | |
1455 | ||
1456 | /* Track down the inline functions step by step */ | |
1457 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1458 | &indie)) { | |
1459 | /* There is an inline function */ | |
1d46ea2a | 1460 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1461 | _addr == addr) { |
1d46ea2a MH |
1462 | /* |
1463 | * addr is at an inline function entry. | |
1464 | * In this case, lineno should be the call-site | |
e08cfd4b | 1465 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1466 | */ |
1467 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1468 | fname = die_get_call_file(&indie); |
1469 | break; | |
1470 | } else { | |
1d46ea2a MH |
1471 | /* |
1472 | * addr is in an inline function body. | |
1473 | * Since lineno points one of the lines | |
1474 | * of the inline function, baseline should | |
1475 | * be the entry line of the inline function. | |
1476 | */ | |
b55a87ad | 1477 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1478 | if (!tmp || |
1479 | dwarf_decl_line(&indie, &baseline) != 0) | |
1480 | break; | |
1481 | func = tmp; | |
1482 | spdie = indie; | |
b55a87ad | 1483 | } |
fb1587d8 | 1484 | } |
e08cfd4b MH |
1485 | /* Verify the lineno and baseline are in a same file */ |
1486 | tmp = dwarf_decl_file(&spdie); | |
1487 | if (!tmp || strcmp(tmp, fname) != 0) | |
1488 | lineno = 0; | |
1d46ea2a MH |
1489 | } |
1490 | ||
1491 | post: | |
1492 | /* Make a relative line number or an offset */ | |
1493 | if (lineno) | |
1494 | ppt->line = lineno - baseline; | |
e08cfd4b | 1495 | else if (basefunc) { |
1d46ea2a | 1496 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1497 | func = basefunc; |
1498 | } | |
1d46ea2a MH |
1499 | |
1500 | /* Duplicate strings */ | |
1501 | if (func) { | |
1502 | ppt->function = strdup(func); | |
02b95dad MH |
1503 | if (ppt->function == NULL) { |
1504 | ret = -ENOMEM; | |
1505 | goto end; | |
1506 | } | |
fb1587d8 | 1507 | } |
1d46ea2a MH |
1508 | if (fname) { |
1509 | ppt->file = strdup(fname); | |
1510 | if (ppt->file == NULL) { | |
04662523 | 1511 | zfree(&ppt->function); |
1d46ea2a MH |
1512 | ret = -ENOMEM; |
1513 | goto end; | |
1514 | } | |
1515 | } | |
fb1587d8 | 1516 | end: |
1d46ea2a MH |
1517 | if (ret == 0 && (fname || func)) |
1518 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1519 | return ret; |
1520 | } | |
1521 | ||
f6c903f5 MH |
1522 | /* Add a line and store the src path */ |
1523 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1524 | struct line_range *lr) | |
1525 | { | |
7cf0b79e | 1526 | /* Copy source path */ |
f6c903f5 | 1527 | if (!lr->path) { |
7cf0b79e MH |
1528 | lr->path = strdup(src); |
1529 | if (lr->path == NULL) | |
1530 | return -ENOMEM; | |
f6c903f5 | 1531 | } |
5a62257a | 1532 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1533 | } |
1534 | ||
4cc9cec6 | 1535 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1536 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1537 | void *data) |
f6c903f5 | 1538 | { |
4cc9cec6 | 1539 | struct line_finder *lf = data; |
202c7c12 | 1540 | int err; |
f6c903f5 | 1541 | |
4cc9cec6 | 1542 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1543 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1544 | return 0; |
f6c903f5 | 1545 | |
202c7c12 NK |
1546 | err = line_range_add_line(fname, lineno, lf->lr); |
1547 | if (err < 0 && err != -EEXIST) | |
1548 | return err; | |
f6c903f5 | 1549 | |
4cc9cec6 | 1550 | return 0; |
f6c903f5 | 1551 | } |
fb1587d8 | 1552 | |
631c9def | 1553 | /* Find line range from its line number */ |
b55a87ad | 1554 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1555 | { |
4cc9cec6 | 1556 | int ret; |
f6c903f5 | 1557 | |
4cc9cec6 | 1558 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1559 | |
804b3606 | 1560 | /* Update status */ |
f6c903f5 | 1561 | if (ret >= 0) |
5a62257a | 1562 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1563 | ret = lf->found = 1; |
1564 | else | |
1565 | ret = 0; /* Lines are not found */ | |
804b3606 | 1566 | else { |
04662523 | 1567 | zfree(&lf->lr->path); |
804b3606 | 1568 | } |
f6c903f5 | 1569 | return ret; |
631c9def MH |
1570 | } |
1571 | ||
161a26b0 MH |
1572 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1573 | { | |
182c228e | 1574 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1575 | |
1576 | /* | |
1577 | * We have to check all instances of inlined function, because | |
1578 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1579 | * function argument of instances. However, if an error occurs, |
1580 | * it should be handled by the caller. | |
36c0c588 | 1581 | */ |
182c228e | 1582 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1583 | } |
1584 | ||
0dbb1cac | 1585 | /* Search function definition from function name */ |
e92b85e1 | 1586 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1587 | { |
b55a87ad MH |
1588 | struct dwarf_callback_param *param = data; |
1589 | struct line_finder *lf = param->data; | |
631c9def | 1590 | struct line_range *lr = lf->lr; |
631c9def | 1591 | |
7d21635a MH |
1592 | /* Check declared file */ |
1593 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1594 | return DWARF_CB_OK; | |
1595 | ||
0dbb1cac | 1596 | if (die_is_func_def(sp_die) && |
4c859351 | 1597 | die_match_name(sp_die, lr->function)) { |
e92b85e1 MH |
1598 | lf->fname = dwarf_decl_file(sp_die); |
1599 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1600 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1601 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1602 | if (lf->lno_s < 0) /* Overflow */ |
1603 | lf->lno_s = INT_MAX; | |
1604 | lf->lno_e = lr->offset + lr->end; | |
1605 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1606 | lf->lno_e = INT_MAX; |
d3b63d7a | 1607 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1608 | lr->start = lf->lno_s; |
1609 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1610 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1611 | param->retval = die_walk_instances(sp_die, |
1612 | line_range_inline_cb, lf); | |
1613 | else | |
b55a87ad MH |
1614 | param->retval = find_line_range_by_line(sp_die, lf); |
1615 | return DWARF_CB_ABORT; | |
631c9def | 1616 | } |
b55a87ad | 1617 | return DWARF_CB_OK; |
631c9def MH |
1618 | } |
1619 | ||
b55a87ad | 1620 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1621 | { |
b55a87ad MH |
1622 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1623 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1624 | return param.retval; | |
631c9def MH |
1625 | } |
1626 | ||
316c7136 | 1627 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1628 | { |
804b3606 | 1629 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1630 | int ret = 0; |
804b3606 MH |
1631 | Dwarf_Off off = 0, noff; |
1632 | size_t cuhl; | |
1633 | Dwarf_Die *diep; | |
6a330a3c | 1634 | const char *comp_dir; |
804b3606 | 1635 | |
cd25f8bc LM |
1636 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1637 | if (lr->function) { | |
1638 | struct pubname_callback_param pubname_param = { | |
1639 | .function = lr->function, .file = lr->file, | |
1640 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1641 | struct dwarf_callback_param line_range_param = { | |
1642 | .data = (void *)&lf, .retval = 0}; | |
1643 | ||
316c7136 | 1644 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1645 | &pubname_param, 0); |
cd25f8bc LM |
1646 | if (pubname_param.found) { |
1647 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1648 | if (lf.found) | |
1649 | goto found; | |
1650 | } | |
1651 | } | |
1652 | ||
804b3606 | 1653 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1654 | while (!lf.found && ret >= 0) { |
316c7136 | 1655 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1656 | NULL, NULL, NULL) != 0) |
631c9def MH |
1657 | break; |
1658 | ||
1659 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1660 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1661 | if (!diep) |
1662 | continue; | |
631c9def MH |
1663 | |
1664 | /* Check if target file is included. */ | |
1665 | if (lr->file) | |
2a9c8c36 | 1666 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1667 | else |
2a9c8c36 | 1668 | lf.fname = 0; |
631c9def | 1669 | |
2a9c8c36 | 1670 | if (!lr->file || lf.fname) { |
631c9def | 1671 | if (lr->function) |
b55a87ad | 1672 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1673 | else { |
1674 | lf.lno_s = lr->start; | |
d3b63d7a | 1675 | lf.lno_e = lr->end; |
b55a87ad | 1676 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1677 | } |
631c9def | 1678 | } |
804b3606 | 1679 | off = noff; |
631c9def | 1680 | } |
6a330a3c | 1681 | |
cd25f8bc | 1682 | found: |
6a330a3c MH |
1683 | /* Store comp_dir */ |
1684 | if (lf.found) { | |
1685 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1686 | if (comp_dir) { | |
1687 | lr->comp_dir = strdup(comp_dir); | |
1688 | if (!lr->comp_dir) | |
1689 | ret = -ENOMEM; | |
1690 | } | |
1691 | } | |
1692 | ||
7cf0b79e | 1693 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1694 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1695 | } |
1696 | ||
09ed8975 NA |
1697 | /* |
1698 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
1699 | * and chop off leading directories that do not exist. Result is passed back as | |
1700 | * a newly allocated path on success. | |
1701 | * Return 0 if file was found and readable, -errno otherwise. | |
1702 | */ | |
1703 | int get_real_path(const char *raw_path, const char *comp_dir, | |
1704 | char **new_path) | |
1705 | { | |
1706 | const char *prefix = symbol_conf.source_prefix; | |
1707 | ||
1708 | if (!prefix) { | |
1709 | if (raw_path[0] != '/' && comp_dir) | |
1710 | /* If not an absolute path, try to use comp_dir */ | |
1711 | prefix = comp_dir; | |
1712 | else { | |
1713 | if (access(raw_path, R_OK) == 0) { | |
1714 | *new_path = strdup(raw_path); | |
1715 | return *new_path ? 0 : -ENOMEM; | |
1716 | } else | |
1717 | return -errno; | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
1722 | if (!*new_path) | |
1723 | return -ENOMEM; | |
1724 | ||
1725 | for (;;) { | |
1726 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
1727 | ||
1728 | if (access(*new_path, R_OK) == 0) | |
1729 | return 0; | |
1730 | ||
1731 | if (!symbol_conf.source_prefix) { | |
1732 | /* In case of searching comp_dir, don't retry */ | |
1733 | zfree(new_path); | |
1734 | return -errno; | |
1735 | } | |
1736 | ||
1737 | switch (errno) { | |
1738 | case ENAMETOOLONG: | |
1739 | case ENOENT: | |
1740 | case EROFS: | |
1741 | case EFAULT: | |
1742 | raw_path = strchr(++raw_path, '/'); | |
1743 | if (!raw_path) { | |
1744 | zfree(new_path); | |
1745 | return -ENOENT; | |
1746 | } | |
1747 | continue; | |
1748 | ||
1749 | default: | |
1750 | zfree(new_path); | |
1751 | return -errno; | |
1752 | } | |
1753 | } | |
1754 | } |