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Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
4ea42b18 MH |
2 | /* |
3 | * probe-finder.c : C expression to kprobe event converter | |
4 | * | |
5 | * Written by Masami Hiramatsu <mhiramat@redhat.com> | |
4ea42b18 MH |
6 | */ |
7 | ||
fd20e811 | 8 | #include <inttypes.h> |
4ea42b18 MH |
9 | #include <sys/utsname.h> |
10 | #include <sys/types.h> | |
11 | #include <sys/stat.h> | |
12 | #include <fcntl.h> | |
13 | #include <errno.h> | |
14 | #include <stdio.h> | |
15 | #include <unistd.h> | |
4ea42b18 MH |
16 | #include <stdlib.h> |
17 | #include <string.h> | |
18 | #include <stdarg.h> | |
cd932c59 | 19 | #include <dwarf-regs.h> |
074fc0e4 | 20 | |
124bb83c | 21 | #include <linux/bitops.h> |
7f7c536f | 22 | #include <linux/zalloc.h> |
89c69c0e | 23 | #include "event.h" |
a15ad2f5 | 24 | #include "dso.h" |
89c69c0e | 25 | #include "debug.h" |
5a62257a | 26 | #include "intlist.h" |
8520a98d | 27 | #include "strbuf.h" |
8ec20b17 | 28 | #include "strlist.h" |
9ed7e1b8 | 29 | #include "symbol.h" |
4ea42b18 | 30 | #include "probe-finder.h" |
180b2061 | 31 | #include "probe-file.h" |
a067558e | 32 | #include "string2.h" |
4ea42b18 | 33 | |
7cd5738d MH |
34 | #ifdef HAVE_DEBUGINFOD_SUPPORT |
35 | #include <elfutils/debuginfod.h> | |
36 | #endif | |
37 | ||
4984912e MH |
38 | /* Kprobe tracer basic type is up to u64 */ |
39 | #define MAX_BASIC_TYPE_BITS 64 | |
40 | ||
469b9b88 | 41 | /* Dwarf FL wrappers */ |
469b9b88 MH |
42 | static char *debuginfo_path; /* Currently dummy */ |
43 | ||
44 | static const Dwfl_Callbacks offline_callbacks = { | |
45 | .find_debuginfo = dwfl_standard_find_debuginfo, | |
46 | .debuginfo_path = &debuginfo_path, | |
47 | ||
48 | .section_address = dwfl_offline_section_address, | |
49 | ||
50 | /* We use this table for core files too. */ | |
51 | .find_elf = dwfl_build_id_find_elf, | |
52 | }; | |
53 | ||
469b9b88 | 54 | /* Get a Dwarf from offline image */ |
316c7136 | 55 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
ff741783 | 56 | const char *path) |
469b9b88 | 57 | { |
7cd5738d | 58 | GElf_Addr dummy; |
ff741783 | 59 | int fd; |
469b9b88 | 60 | |
ff741783 MH |
61 | fd = open(path, O_RDONLY); |
62 | if (fd < 0) | |
63 | return fd; | |
469b9b88 | 64 | |
316c7136 ACM |
65 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
66 | if (!dbg->dwfl) | |
ff741783 | 67 | goto error; |
469b9b88 | 68 | |
9135949d | 69 | dwfl_report_begin(dbg->dwfl); |
316c7136 ACM |
70 | dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd); |
71 | if (!dbg->mod) | |
469b9b88 MH |
72 | goto error; |
73 | ||
316c7136 ACM |
74 | dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias); |
75 | if (!dbg->dbg) | |
ff741783 MH |
76 | goto error; |
77 | ||
7cd5738d MH |
78 | dwfl_module_build_id(dbg->mod, &dbg->build_id, &dummy); |
79 | ||
9135949d MH |
80 | dwfl_report_end(dbg->dwfl, NULL, NULL); |
81 | ||
ff741783 | 82 | return 0; |
469b9b88 | 83 | error: |
316c7136 ACM |
84 | if (dbg->dwfl) |
85 | dwfl_end(dbg->dwfl); | |
ff741783 MH |
86 | else |
87 | close(fd); | |
316c7136 | 88 | memset(dbg, 0, sizeof(*dbg)); |
ff741783 MH |
89 | |
90 | return -ENOENT; | |
469b9b88 MH |
91 | } |
92 | ||
a15ad2f5 | 93 | static struct debuginfo *__debuginfo__new(const char *path) |
ff741783 | 94 | { |
316c7136 ACM |
95 | struct debuginfo *dbg = zalloc(sizeof(*dbg)); |
96 | if (!dbg) | |
3b4694de MH |
97 | return NULL; |
98 | ||
04662523 ACM |
99 | if (debuginfo__init_offline_dwarf(dbg, path) < 0) |
100 | zfree(&dbg); | |
a15ad2f5 MH |
101 | if (dbg) |
102 | pr_debug("Open Debuginfo file: %s\n", path); | |
316c7136 | 103 | return dbg; |
ff741783 MH |
104 | } |
105 | ||
a15ad2f5 MH |
106 | enum dso_binary_type distro_dwarf_types[] = { |
107 | DSO_BINARY_TYPE__FEDORA_DEBUGINFO, | |
108 | DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, | |
109 | DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, | |
110 | DSO_BINARY_TYPE__BUILDID_DEBUGINFO, | |
85afd355 | 111 | DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO, |
a15ad2f5 MH |
112 | DSO_BINARY_TYPE__NOT_FOUND, |
113 | }; | |
114 | ||
115 | struct debuginfo *debuginfo__new(const char *path) | |
116 | { | |
117 | enum dso_binary_type *type; | |
118 | char buf[PATH_MAX], nil = '\0'; | |
119 | struct dso *dso; | |
120 | struct debuginfo *dinfo = NULL; | |
121 | ||
122 | /* Try to open distro debuginfo files */ | |
123 | dso = dso__new(path); | |
124 | if (!dso) | |
125 | goto out; | |
126 | ||
127 | for (type = distro_dwarf_types; | |
128 | !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; | |
129 | type++) { | |
130 | if (dso__read_binary_type_filename(dso, *type, &nil, | |
131 | buf, PATH_MAX) < 0) | |
132 | continue; | |
133 | dinfo = __debuginfo__new(buf); | |
134 | } | |
d3a7c489 | 135 | dso__put(dso); |
a15ad2f5 MH |
136 | |
137 | out: | |
138 | /* if failed to open all distro debuginfo, open given binary */ | |
139 | return dinfo ? : __debuginfo__new(path); | |
140 | } | |
141 | ||
316c7136 | 142 | void debuginfo__delete(struct debuginfo *dbg) |
ff741783 | 143 | { |
316c7136 ACM |
144 | if (dbg) { |
145 | if (dbg->dwfl) | |
146 | dwfl_end(dbg->dwfl); | |
147 | free(dbg); | |
ff741783 | 148 | } |
3b4694de | 149 | } |
469b9b88 | 150 | |
4ea42b18 MH |
151 | /* |
152 | * Probe finder related functions | |
153 | */ | |
154 | ||
0e60836b | 155 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
b7dcb857 | 156 | { |
0e60836b SD |
157 | struct probe_trace_arg_ref *ref; |
158 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); | |
b7dcb857 MH |
159 | if (ref != NULL) |
160 | ref->offset = offs; | |
161 | return ref; | |
162 | } | |
163 | ||
cf6eb489 MH |
164 | /* |
165 | * Convert a location into trace_arg. | |
166 | * If tvar == NULL, this just checks variable can be converted. | |
3d918a12 MH |
167 | * If fentry == true and vr_die is a parameter, do huristic search |
168 | * for the location fuzzed by function entry mcount. | |
cf6eb489 MH |
169 | */ |
170 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, | |
3d918a12 | 171 | Dwarf_Op *fb_ops, Dwarf_Die *sp_die, |
293d5b43 | 172 | unsigned int machine, |
cf6eb489 | 173 | struct probe_trace_arg *tvar) |
4ea42b18 | 174 | { |
b7dcb857 | 175 | Dwarf_Attribute attr; |
3d918a12 | 176 | Dwarf_Addr tmp = 0; |
b7dcb857 MH |
177 | Dwarf_Op *op; |
178 | size_t nops; | |
804b3606 MH |
179 | unsigned int regn; |
180 | Dwarf_Word offs = 0; | |
4235b045 | 181 | bool ref = false; |
4ea42b18 | 182 | const char *regs; |
349e8d26 | 183 | int ret, ret2 = 0; |
b7dcb857 | 184 | |
632941c4 MH |
185 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
186 | goto static_var; | |
187 | ||
66f69b21 MH |
188 | /* Constant value */ |
189 | if (dwarf_attr(vr_die, DW_AT_const_value, &attr) && | |
190 | immediate_value_is_supported()) { | |
191 | Dwarf_Sword snum; | |
192 | ||
193 | dwarf_formsdata(&attr, &snum); | |
194 | ret = asprintf(&tvar->value, "\\%ld", (long)snum); | |
195 | ||
196 | return ret < 0 ? -ENOMEM : 0; | |
197 | } | |
198 | ||
b7dcb857 | 199 | /* TODO: handle more than 1 exprs */ |
3d918a12 MH |
200 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
201 | return -EINVAL; /* Broken DIE ? */ | |
202 | if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) { | |
203 | ret = dwarf_entrypc(sp_die, &tmp); | |
349e8d26 HK |
204 | if (ret) |
205 | return -ENOENT; | |
206 | ||
207 | if (probe_conf.show_location_range && | |
208 | (dwarf_tag(vr_die) == DW_TAG_variable)) { | |
209 | ret2 = -ERANGE; | |
210 | } else if (addr != tmp || | |
211 | dwarf_tag(vr_die) != DW_TAG_formal_parameter) { | |
212 | return -ENOENT; | |
213 | } | |
214 | ||
215 | ret = dwarf_highpc(sp_die, &tmp); | |
216 | if (ret) | |
3d918a12 MH |
217 | return -ENOENT; |
218 | /* | |
219 | * This is fuzzed by fentry mcount. We try to find the | |
220 | * parameter location at the earliest address. | |
221 | */ | |
222 | for (addr += 1; addr <= tmp; addr++) { | |
223 | if (dwarf_getlocation_addr(&attr, addr, &op, | |
224 | &nops, 1) > 0) | |
225 | goto found; | |
226 | } | |
b7dcb857 MH |
227 | return -ENOENT; |
228 | } | |
3d918a12 MH |
229 | found: |
230 | if (nops == 0) | |
231 | /* TODO: Support const_value */ | |
232 | return -ENOENT; | |
b7dcb857 MH |
233 | |
234 | if (op->atom == DW_OP_addr) { | |
632941c4 | 235 | static_var: |
cf6eb489 | 236 | if (!tvar) |
349e8d26 | 237 | return ret2; |
b7dcb857 MH |
238 | /* Static variables on memory (not stack), make @varname */ |
239 | ret = strlen(dwarf_diename(vr_die)); | |
240 | tvar->value = zalloc(ret + 2); | |
241 | if (tvar->value == NULL) | |
242 | return -ENOMEM; | |
243 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); | |
244 | tvar->ref = alloc_trace_arg_ref((long)offs); | |
245 | if (tvar->ref == NULL) | |
246 | return -ENOMEM; | |
349e8d26 | 247 | return ret2; |
b7dcb857 | 248 | } |
4ea42b18 | 249 | |
4ea42b18 | 250 | /* If this is based on frame buffer, set the offset */ |
804b3606 | 251 | if (op->atom == DW_OP_fbreg) { |
cf6eb489 | 252 | if (fb_ops == NULL) |
b55a87ad | 253 | return -ENOTSUP; |
4235b045 | 254 | ref = true; |
804b3606 | 255 | offs = op->number; |
cf6eb489 | 256 | op = &fb_ops[0]; |
804b3606 | 257 | } |
4ea42b18 | 258 | |
804b3606 MH |
259 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
260 | regn = op->atom - DW_OP_breg0; | |
261 | offs += op->number; | |
4235b045 | 262 | ref = true; |
804b3606 MH |
263 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
264 | regn = op->atom - DW_OP_reg0; | |
265 | } else if (op->atom == DW_OP_bregx) { | |
266 | regn = op->number; | |
267 | offs += op->number2; | |
4235b045 | 268 | ref = true; |
804b3606 MH |
269 | } else if (op->atom == DW_OP_regx) { |
270 | regn = op->number; | |
b55a87ad | 271 | } else { |
cf6eb489 | 272 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
b55a87ad MH |
273 | return -ENOTSUP; |
274 | } | |
4ea42b18 | 275 | |
cf6eb489 | 276 | if (!tvar) |
349e8d26 | 277 | return ret2; |
cf6eb489 | 278 | |
293d5b43 | 279 | regs = get_dwarf_regstr(regn, machine); |
b55a87ad | 280 | if (!regs) { |
cf6eb489 | 281 | /* This should be a bug in DWARF or this tool */ |
0e43e5d2 MH |
282 | pr_warning("Mapping for the register number %u " |
283 | "missing on this architecture.\n", regn); | |
349e8d26 | 284 | return -ENOTSUP; |
b55a87ad | 285 | } |
4ea42b18 | 286 | |
02b95dad MH |
287 | tvar->value = strdup(regs); |
288 | if (tvar->value == NULL) | |
289 | return -ENOMEM; | |
290 | ||
4235b045 | 291 | if (ref) { |
b7dcb857 | 292 | tvar->ref = alloc_trace_arg_ref((long)offs); |
e334016f MH |
293 | if (tvar->ref == NULL) |
294 | return -ENOMEM; | |
4235b045 | 295 | } |
349e8d26 | 296 | return ret2; |
4ea42b18 MH |
297 | } |
298 | ||
124bb83c MH |
299 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
300 | ||
b55a87ad | 301 | static int convert_variable_type(Dwarf_Die *vr_die, |
0e60836b | 302 | struct probe_trace_arg *tvar, |
1e032f7c | 303 | const char *cast, bool user_access) |
4984912e | 304 | { |
0e60836b | 305 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
4984912e MH |
306 | Dwarf_Die type; |
307 | char buf[16]; | |
5f03cba4 | 308 | char sbuf[STRERR_BUFSIZE]; |
bcfc0821 | 309 | int bsize, boffs, total; |
4984912e | 310 | int ret; |
92543787 | 311 | char prefix; |
4984912e | 312 | |
73317b95 | 313 | /* TODO: check all types */ |
1873f154 TR |
314 | if (cast && strcmp(cast, "string") != 0 && strcmp(cast, "ustring") && |
315 | strcmp(cast, "x") != 0 && | |
19f00b01 | 316 | strcmp(cast, "s") != 0 && strcmp(cast, "u") != 0) { |
73317b95 | 317 | /* Non string type is OK */ |
92543787 | 318 | /* and respect signedness/hexadecimal cast */ |
73317b95 MH |
319 | tvar->type = strdup(cast); |
320 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
321 | } | |
322 | ||
bcfc0821 MH |
323 | bsize = dwarf_bitsize(vr_die); |
324 | if (bsize > 0) { | |
124bb83c | 325 | /* This is a bitfield */ |
bcfc0821 MH |
326 | boffs = dwarf_bitoffset(vr_die); |
327 | total = dwarf_bytesize(vr_die); | |
328 | if (boffs < 0 || total < 0) | |
329 | return -ENOENT; | |
330 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, | |
331 | BYTES_TO_BITS(total)); | |
124bb83c MH |
332 | goto formatted; |
333 | } | |
334 | ||
b55a87ad MH |
335 | if (die_get_real_type(vr_die, &type) == NULL) { |
336 | pr_warning("Failed to get a type information of %s.\n", | |
337 | dwarf_diename(vr_die)); | |
338 | return -ENOENT; | |
339 | } | |
4984912e | 340 | |
b2a3c12b MH |
341 | pr_debug("%s type is %s.\n", |
342 | dwarf_diename(vr_die), dwarf_diename(&type)); | |
343 | ||
1e032f7c MH |
344 | if (cast && (!strcmp(cast, "string") || !strcmp(cast, "ustring"))) { |
345 | /* String type */ | |
73317b95 MH |
346 | ret = dwarf_tag(&type); |
347 | if (ret != DW_TAG_pointer_type && | |
348 | ret != DW_TAG_array_type) { | |
349 | pr_warning("Failed to cast into string: " | |
0e43e5d2 | 350 | "%s(%s) is not a pointer nor array.\n", |
73317b95 MH |
351 | dwarf_diename(vr_die), dwarf_diename(&type)); |
352 | return -EINVAL; | |
353 | } | |
7ce28b5b HL |
354 | if (die_get_real_type(&type, &type) == NULL) { |
355 | pr_warning("Failed to get a type" | |
356 | " information.\n"); | |
357 | return -ENOENT; | |
358 | } | |
73317b95 | 359 | if (ret == DW_TAG_pointer_type) { |
73317b95 MH |
360 | while (*ref_ptr) |
361 | ref_ptr = &(*ref_ptr)->next; | |
362 | /* Add new reference with offset +0 */ | |
0e60836b | 363 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
73317b95 MH |
364 | if (*ref_ptr == NULL) { |
365 | pr_warning("Out of memory error\n"); | |
366 | return -ENOMEM; | |
367 | } | |
1e032f7c | 368 | (*ref_ptr)->user_access = user_access; |
73317b95 | 369 | } |
82175633 MH |
370 | if (!die_compare_name(&type, "char") && |
371 | !die_compare_name(&type, "unsigned char")) { | |
73317b95 | 372 | pr_warning("Failed to cast into string: " |
0e43e5d2 | 373 | "%s is not (unsigned) char *.\n", |
73317b95 MH |
374 | dwarf_diename(vr_die)); |
375 | return -EINVAL; | |
376 | } | |
377 | tvar->type = strdup(cast); | |
378 | return (tvar->type == NULL) ? -ENOMEM : 0; | |
379 | } | |
380 | ||
19f00b01 | 381 | if (cast && (strcmp(cast, "u") == 0)) |
92543787 | 382 | prefix = 'u'; |
19f00b01 | 383 | else if (cast && (strcmp(cast, "s") == 0)) |
92543787 MH |
384 | prefix = 's'; |
385 | else if (cast && (strcmp(cast, "x") == 0) && | |
386 | probe_type_is_available(PROBE_TYPE_X)) | |
387 | prefix = 'x'; | |
19f00b01 | 388 | else |
9880ce4a MH |
389 | prefix = die_is_signed_type(&type) ? 's' : |
390 | probe_type_is_available(PROBE_TYPE_X) ? 'x' : 'u'; | |
19f00b01 | 391 | |
bcfc0821 MH |
392 | ret = dwarf_bytesize(&type); |
393 | if (ret <= 0) | |
124bb83c MH |
394 | /* No size ... try to use default type */ |
395 | return 0; | |
bcfc0821 | 396 | ret = BYTES_TO_BITS(ret); |
4984912e | 397 | |
124bb83c MH |
398 | /* Check the bitwidth */ |
399 | if (ret > MAX_BASIC_TYPE_BITS) { | |
400 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", | |
401 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); | |
402 | ret = MAX_BASIC_TYPE_BITS; | |
4984912e | 403 | } |
92543787 | 404 | ret = snprintf(buf, 16, "%c%d", prefix, ret); |
124bb83c MH |
405 | |
406 | formatted: | |
407 | if (ret < 0 || ret >= 16) { | |
408 | if (ret >= 16) | |
409 | ret = -E2BIG; | |
410 | pr_warning("Failed to convert variable type: %s\n", | |
c8b5f2c9 | 411 | str_error_r(-ret, sbuf, sizeof(sbuf))); |
124bb83c MH |
412 | return ret; |
413 | } | |
414 | tvar->type = strdup(buf); | |
415 | if (tvar->type == NULL) | |
416 | return -ENOMEM; | |
b55a87ad | 417 | return 0; |
4984912e MH |
418 | } |
419 | ||
b55a87ad | 420 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
7df2f329 | 421 | struct perf_probe_arg_field *field, |
0e60836b | 422 | struct probe_trace_arg_ref **ref_ptr, |
1e032f7c | 423 | Dwarf_Die *die_mem, bool user_access) |
7df2f329 | 424 | { |
0e60836b | 425 | struct probe_trace_arg_ref *ref = *ref_ptr; |
7df2f329 MH |
426 | Dwarf_Die type; |
427 | Dwarf_Word offs; | |
b2a3c12b | 428 | int ret, tag; |
7df2f329 MH |
429 | |
430 | pr_debug("converting %s in %s\n", field->name, varname); | |
b55a87ad MH |
431 | if (die_get_real_type(vr_die, &type) == NULL) { |
432 | pr_warning("Failed to get the type of %s.\n", varname); | |
433 | return -ENOENT; | |
434 | } | |
d0461794 MH |
435 | pr_debug2("Var real type: %s (%x)\n", dwarf_diename(&type), |
436 | (unsigned)dwarf_dieoffset(&type)); | |
b2a3c12b MH |
437 | tag = dwarf_tag(&type); |
438 | ||
439 | if (field->name[0] == '[' && | |
440 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { | |
d0461794 MH |
441 | /* Save original type for next field or type */ |
442 | memcpy(die_mem, &type, sizeof(*die_mem)); | |
b2a3c12b MH |
443 | /* Get the type of this array */ |
444 | if (die_get_real_type(&type, &type) == NULL) { | |
445 | pr_warning("Failed to get the type of %s.\n", varname); | |
446 | return -ENOENT; | |
447 | } | |
d0461794 | 448 | pr_debug2("Array real type: %s (%x)\n", dwarf_diename(&type), |
b2a3c12b MH |
449 | (unsigned)dwarf_dieoffset(&type)); |
450 | if (tag == DW_TAG_pointer_type) { | |
0e60836b | 451 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
b2a3c12b MH |
452 | if (ref == NULL) |
453 | return -ENOMEM; | |
454 | if (*ref_ptr) | |
455 | (*ref_ptr)->next = ref; | |
456 | else | |
457 | *ref_ptr = ref; | |
458 | } | |
bcfc0821 | 459 | ref->offset += dwarf_bytesize(&type) * field->index; |
1e032f7c | 460 | ref->user_access = user_access; |
b2a3c12b MH |
461 | goto next; |
462 | } else if (tag == DW_TAG_pointer_type) { | |
463 | /* Check the pointer and dereference */ | |
b55a87ad MH |
464 | if (!field->ref) { |
465 | pr_err("Semantic error: %s must be referred by '->'\n", | |
466 | field->name); | |
467 | return -EINVAL; | |
468 | } | |
7df2f329 | 469 | /* Get the type pointed by this pointer */ |
b55a87ad MH |
470 | if (die_get_real_type(&type, &type) == NULL) { |
471 | pr_warning("Failed to get the type of %s.\n", varname); | |
472 | return -ENOENT; | |
473 | } | |
12e5a7ae | 474 | /* Verify it is a data structure */ |
7b0295b3 HL |
475 | tag = dwarf_tag(&type); |
476 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { | |
03440c4e | 477 | pr_warning("%s is not a data structure nor a union.\n", |
7b0295b3 | 478 | varname); |
b55a87ad MH |
479 | return -EINVAL; |
480 | } | |
12e5a7ae | 481 | |
0e60836b | 482 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
e334016f MH |
483 | if (ref == NULL) |
484 | return -ENOMEM; | |
7df2f329 MH |
485 | if (*ref_ptr) |
486 | (*ref_ptr)->next = ref; | |
487 | else | |
488 | *ref_ptr = ref; | |
489 | } else { | |
12e5a7ae | 490 | /* Verify it is a data structure */ |
7b0295b3 | 491 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
03440c4e | 492 | pr_warning("%s is not a data structure nor a union.\n", |
7b0295b3 | 493 | varname); |
b55a87ad MH |
494 | return -EINVAL; |
495 | } | |
b2a3c12b | 496 | if (field->name[0] == '[') { |
d939be3a | 497 | pr_err("Semantic error: %s is not a pointer" |
0e43e5d2 | 498 | " nor array.\n", varname); |
b2a3c12b MH |
499 | return -EINVAL; |
500 | } | |
c7273835 MH |
501 | /* While prcessing unnamed field, we don't care about this */ |
502 | if (field->ref && dwarf_diename(vr_die)) { | |
b55a87ad MH |
503 | pr_err("Semantic error: %s must be referred by '.'\n", |
504 | field->name); | |
505 | return -EINVAL; | |
506 | } | |
507 | if (!ref) { | |
508 | pr_warning("Structure on a register is not " | |
509 | "supported yet.\n"); | |
510 | return -ENOTSUP; | |
511 | } | |
7df2f329 MH |
512 | } |
513 | ||
b55a87ad | 514 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
9ef0438a | 515 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
b55a87ad MH |
516 | dwarf_diename(&type), field->name); |
517 | return -EINVAL; | |
518 | } | |
7df2f329 MH |
519 | |
520 | /* Get the offset of the field */ | |
7b0295b3 HL |
521 | if (tag == DW_TAG_union_type) { |
522 | offs = 0; | |
523 | } else { | |
524 | ret = die_get_data_member_location(die_mem, &offs); | |
525 | if (ret < 0) { | |
526 | pr_warning("Failed to get the offset of %s.\n", | |
527 | field->name); | |
528 | return ret; | |
529 | } | |
b55a87ad | 530 | } |
7df2f329 | 531 | ref->offset += (long)offs; |
1e032f7c | 532 | ref->user_access = user_access; |
7df2f329 | 533 | |
c7273835 MH |
534 | /* If this member is unnamed, we need to reuse this field */ |
535 | if (!dwarf_diename(die_mem)) | |
536 | return convert_variable_fields(die_mem, varname, field, | |
1e032f7c | 537 | &ref, die_mem, user_access); |
c7273835 | 538 | |
b2a3c12b | 539 | next: |
7df2f329 MH |
540 | /* Converting next field */ |
541 | if (field->next) | |
b55a87ad | 542 | return convert_variable_fields(die_mem, field->name, |
1e032f7c | 543 | field->next, &ref, die_mem, user_access); |
b55a87ad MH |
544 | else |
545 | return 0; | |
7df2f329 MH |
546 | } |
547 | ||
cb402730 MH |
548 | static void print_var_not_found(const char *varname) |
549 | { | |
550 | pr_err("Failed to find the location of the '%s' variable at this address.\n" | |
551 | " Perhaps it has been optimized out.\n" | |
552 | " Use -V with the --range option to show '%s' location range.\n", | |
553 | varname, varname); | |
554 | } | |
555 | ||
4ea42b18 | 556 | /* Show a variables in kprobe event format */ |
b55a87ad | 557 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
4ea42b18 | 558 | { |
4984912e | 559 | Dwarf_Die die_mem; |
4ea42b18 MH |
560 | int ret; |
561 | ||
b7dcb857 MH |
562 | pr_debug("Converting variable %s into trace event.\n", |
563 | dwarf_diename(vr_die)); | |
804b3606 | 564 | |
cf6eb489 | 565 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
293d5b43 | 566 | &pf->sp_die, pf->machine, pf->tvar); |
cb402730 MH |
567 | if (ret == -ENOENT && pf->skip_empty_arg) |
568 | /* This can be found in other place. skip it */ | |
569 | return 0; | |
7d5eaba9 | 570 | if (ret == -ENOENT || ret == -EINVAL) { |
cb402730 | 571 | print_var_not_found(pf->pvar->var); |
7d5eaba9 | 572 | } else if (ret == -ENOTSUP) |
cf6eb489 | 573 | pr_err("Sorry, we don't support this variable location yet.\n"); |
0c188a07 | 574 | else if (ret == 0 && pf->pvar->field) { |
b55a87ad MH |
575 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
576 | pf->pvar->field, &pf->tvar->ref, | |
1e032f7c | 577 | &die_mem, pf->pvar->user_access); |
4984912e MH |
578 | vr_die = &die_mem; |
579 | } | |
73317b95 | 580 | if (ret == 0) |
1e032f7c MH |
581 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type, |
582 | pf->pvar->user_access); | |
804b3606 | 583 | /* *expr will be cached in libdw. Don't free it. */ |
b55a87ad | 584 | return ret; |
4ea42b18 MH |
585 | } |
586 | ||
221d0611 MH |
587 | /* Find a variable in a scope DIE */ |
588 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) | |
4ea42b18 | 589 | { |
f182e3e1 | 590 | Dwarf_Die vr_die; |
909b0360 | 591 | char *buf, *ptr; |
f182e3e1 | 592 | int ret = 0; |
4ea42b18 | 593 | |
da15bd9d WN |
594 | /* Copy raw parameters */ |
595 | if (!is_c_varname(pf->pvar->var)) | |
596 | return copy_to_probe_trace_arg(pf->tvar, pf->pvar); | |
367e94c1 | 597 | |
48481938 | 598 | if (pf->pvar->name) |
02b95dad | 599 | pf->tvar->name = strdup(pf->pvar->name); |
48481938 | 600 | else { |
909b0360 MH |
601 | buf = synthesize_perf_probe_arg(pf->pvar); |
602 | if (!buf) | |
603 | return -ENOMEM; | |
11a1ca35 MH |
604 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
605 | if (ptr) | |
606 | *ptr = '_'; | |
909b0360 | 607 | pf->tvar->name = buf; |
48481938 | 608 | } |
02b95dad MH |
609 | if (pf->tvar->name == NULL) |
610 | return -ENOMEM; | |
48481938 | 611 | |
f182e3e1 | 612 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
b55a87ad | 613 | /* Search child die for local variables and parameters. */ |
f182e3e1 MH |
614 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
615 | /* Search again in global variables */ | |
d13855ef HK |
616 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, |
617 | 0, &vr_die)) { | |
cb402730 MH |
618 | if (pf->skip_empty_arg) |
619 | return 0; | |
36d789a4 MH |
620 | pr_warning("Failed to find '%s' in this function.\n", |
621 | pf->pvar->var); | |
f182e3e1 | 622 | ret = -ENOENT; |
d13855ef | 623 | } |
b7dcb857 | 624 | } |
f66fedcb | 625 | if (ret >= 0) |
f182e3e1 MH |
626 | ret = convert_variable(&vr_die, pf); |
627 | ||
b7dcb857 | 628 | return ret; |
4ea42b18 MH |
629 | } |
630 | ||
cf6eb489 | 631 | /* Convert subprogram DIE to trace point */ |
576b5237 MH |
632 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
633 | Dwarf_Addr paddr, bool retprobe, | |
6cca13bd | 634 | const char *function, |
576b5237 | 635 | struct probe_trace_point *tp) |
4ea42b18 | 636 | { |
07d36985 | 637 | Dwarf_Addr eaddr; |
576b5237 MH |
638 | GElf_Sym sym; |
639 | const char *symbol; | |
640 | ||
641 | /* Verify the address is correct */ | |
07d36985 MH |
642 | if (!dwarf_haspc(sp_die, paddr)) { |
643 | pr_warning("Specified offset is out of %s\n", | |
576b5237 MH |
644 | dwarf_diename(sp_die)); |
645 | return -EINVAL; | |
646 | } | |
647 | ||
1efde275 MH |
648 | if (dwarf_entrypc(sp_die, &eaddr) == 0) { |
649 | /* If the DIE has entrypc, use it. */ | |
650 | symbol = dwarf_diename(sp_die); | |
651 | } else { | |
652 | /* Try to get actual symbol name and address from symtab */ | |
653 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); | |
654 | eaddr = sym.st_value; | |
655 | } | |
576b5237 | 656 | if (!symbol) { |
07d36985 MH |
657 | pr_warning("Failed to find symbol at 0x%lx\n", |
658 | (unsigned long)paddr); | |
659 | return -ENOENT; | |
576b5237 | 660 | } |
07d36985 | 661 | |
664fee3d | 662 | tp->offset = (unsigned long)(paddr - eaddr); |
fb7345bb | 663 | tp->address = (unsigned long)paddr; |
576b5237 MH |
664 | tp->symbol = strdup(symbol); |
665 | if (!tp->symbol) | |
666 | return -ENOMEM; | |
4235b045 | 667 | |
04ddd04b | 668 | /* Return probe must be on the head of a subprogram */ |
cf6eb489 MH |
669 | if (retprobe) { |
670 | if (eaddr != paddr) { | |
6cca13bd MH |
671 | pr_warning("Failed to find \"%s%%return\",\n" |
672 | " because %s is an inlined function and" | |
673 | " has no return point.\n", function, | |
674 | function); | |
04ddd04b MH |
675 | return -EINVAL; |
676 | } | |
cf6eb489 | 677 | tp->retprobe = true; |
04ddd04b MH |
678 | } |
679 | ||
cf6eb489 MH |
680 | return 0; |
681 | } | |
682 | ||
221d0611 MH |
683 | /* Call probe_finder callback with scope DIE */ |
684 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) | |
cf6eb489 | 685 | { |
cf6eb489 | 686 | Dwarf_Attribute fb_attr; |
4d3b1626 | 687 | Dwarf_Frame *frame = NULL; |
cf6eb489 MH |
688 | size_t nops; |
689 | int ret; | |
690 | ||
221d0611 MH |
691 | if (!sc_die) { |
692 | pr_err("Caller must pass a scope DIE. Program error.\n"); | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
696 | /* If not a real subprogram, find a real one */ | |
0dbb1cac | 697 | if (!die_is_func_def(sc_die)) { |
221d0611 | 698 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
d4c537e6 NR |
699 | if (die_find_tailfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
700 | pr_warning("Ignoring tail call from %s\n", | |
701 | dwarf_diename(&pf->sp_die)); | |
702 | return 0; | |
703 | } else { | |
704 | pr_warning("Failed to find probe point in any " | |
705 | "functions.\n"); | |
706 | return -ENOENT; | |
707 | } | |
cf6eb489 | 708 | } |
221d0611 MH |
709 | } else |
710 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); | |
4ea42b18 | 711 | |
221d0611 MH |
712 | /* Get the frame base attribute/ops from subprogram */ |
713 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); | |
d0cb4260 | 714 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
a34a9854 | 715 | if (ret <= 0 || nops == 0) { |
804b3606 | 716 | pf->fb_ops = NULL; |
7752f1b0 | 717 | #if _ELFUTILS_PREREQ(0, 142) |
a34a9854 | 718 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
270bde1e HK |
719 | (pf->cfi_eh != NULL || pf->cfi_dbg != NULL)) { |
720 | if ((dwarf_cfi_addrframe(pf->cfi_eh, pf->addr, &frame) != 0 && | |
721 | (dwarf_cfi_addrframe(pf->cfi_dbg, pf->addr, &frame) != 0)) || | |
b55a87ad | 722 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { |
0e43e5d2 | 723 | pr_warning("Failed to get call frame on 0x%jx\n", |
b55a87ad | 724 | (uintmax_t)pf->addr); |
4d3b1626 MH |
725 | free(frame); |
726 | return -ENOENT; | |
b55a87ad | 727 | } |
7752f1b0 | 728 | #endif |
a34a9854 | 729 | } |
804b3606 | 730 | |
cf6eb489 | 731 | /* Call finder's callback handler */ |
4d3b1626 | 732 | ret = pf->callback(sc_die, pf); |
804b3606 | 733 | |
4d3b1626 MH |
734 | /* Since *pf->fb_ops can be a part of frame. we should free it here. */ |
735 | free(frame); | |
804b3606 | 736 | pf->fb_ops = NULL; |
cf6eb489 MH |
737 | |
738 | return ret; | |
4ea42b18 MH |
739 | } |
740 | ||
221d0611 MH |
741 | struct find_scope_param { |
742 | const char *function; | |
743 | const char *file; | |
744 | int line; | |
745 | int diff; | |
746 | Dwarf_Die *die_mem; | |
747 | bool found; | |
748 | }; | |
749 | ||
750 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) | |
751 | { | |
752 | struct find_scope_param *fsp = data; | |
753 | const char *file; | |
754 | int lno; | |
755 | ||
756 | /* Skip if declared file name does not match */ | |
757 | if (fsp->file) { | |
758 | file = dwarf_decl_file(fn_die); | |
759 | if (!file || strcmp(fsp->file, file) != 0) | |
760 | return 0; | |
761 | } | |
762 | /* If the function name is given, that's what user expects */ | |
763 | if (fsp->function) { | |
4c859351 | 764 | if (die_match_name(fn_die, fsp->function)) { |
221d0611 MH |
765 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
766 | fsp->found = true; | |
767 | return 1; | |
768 | } | |
769 | } else { | |
770 | /* With the line number, find the nearest declared DIE */ | |
771 | dwarf_decl_line(fn_die, &lno); | |
772 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { | |
773 | /* Keep a candidate and continue */ | |
774 | fsp->diff = fsp->line - lno; | |
775 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
776 | fsp->found = true; | |
777 | } | |
778 | } | |
779 | return 0; | |
780 | } | |
781 | ||
c701636a MH |
782 | /* Return innermost DIE */ |
783 | static int find_inner_scope_cb(Dwarf_Die *fn_die, void *data) | |
784 | { | |
785 | struct find_scope_param *fsp = data; | |
786 | ||
787 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); | |
788 | fsp->found = true; | |
789 | return 1; | |
790 | } | |
791 | ||
221d0611 MH |
792 | /* Find an appropriate scope fits to given conditions */ |
793 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) | |
794 | { | |
795 | struct find_scope_param fsp = { | |
796 | .function = pf->pev->point.function, | |
797 | .file = pf->fname, | |
798 | .line = pf->lno, | |
799 | .diff = INT_MAX, | |
800 | .die_mem = die_mem, | |
801 | .found = false, | |
802 | }; | |
c701636a | 803 | int ret; |
221d0611 | 804 | |
c701636a MH |
805 | ret = cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, |
806 | &fsp); | |
807 | if (!ret && !fsp.found) | |
808 | cu_walk_functions_at(&pf->cu_die, pf->addr, | |
809 | find_inner_scope_cb, &fsp); | |
221d0611 MH |
810 | |
811 | return fsp.found ? die_mem : NULL; | |
812 | } | |
813 | ||
1ae5d88a MH |
814 | static int verify_representive_line(struct probe_finder *pf, const char *fname, |
815 | int lineno, Dwarf_Addr addr) | |
816 | { | |
817 | const char *__fname, *__func = NULL; | |
818 | Dwarf_Die die_mem; | |
819 | int __lineno; | |
820 | ||
821 | /* Verify line number and address by reverse search */ | |
822 | if (cu_find_lineinfo(&pf->cu_die, addr, &__fname, &__lineno) < 0) | |
823 | return 0; | |
824 | ||
825 | pr_debug2("Reversed line: %s:%d\n", __fname, __lineno); | |
826 | if (strcmp(fname, __fname) || lineno == __lineno) | |
827 | return 0; | |
828 | ||
358f98ee | 829 | pr_warning("This line is sharing the address with other lines.\n"); |
1ae5d88a MH |
830 | |
831 | if (pf->pev->point.function) { | |
832 | /* Find best match function name and lines */ | |
833 | pf->addr = addr; | |
834 | if (find_best_scope(pf, &die_mem) | |
835 | && die_match_name(&die_mem, pf->pev->point.function) | |
836 | && dwarf_decl_line(&die_mem, &lineno) == 0) { | |
837 | __func = dwarf_diename(&die_mem); | |
838 | __lineno -= lineno; | |
839 | } | |
840 | } | |
841 | pr_warning("Please try to probe at %s:%d instead.\n", | |
842 | __func ? : __fname, __lineno); | |
843 | ||
844 | return -ENOENT; | |
845 | } | |
846 | ||
4cc9cec6 MH |
847 | static int probe_point_line_walker(const char *fname, int lineno, |
848 | Dwarf_Addr addr, void *data) | |
4ea42b18 | 849 | { |
4cc9cec6 | 850 | struct probe_finder *pf = data; |
221d0611 | 851 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 | 852 | int ret; |
4ea42b18 | 853 | |
4cc9cec6 MH |
854 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
855 | return 0; | |
4ea42b18 | 856 | |
1ae5d88a MH |
857 | if (verify_representive_line(pf, fname, lineno, addr)) |
858 | return -ENOENT; | |
859 | ||
4cc9cec6 | 860 | pf->addr = addr; |
221d0611 MH |
861 | sc_die = find_best_scope(pf, &die_mem); |
862 | if (!sc_die) { | |
863 | pr_warning("Failed to find scope of probe point.\n"); | |
864 | return -ENOENT; | |
865 | } | |
866 | ||
867 | ret = call_probe_finder(sc_die, pf); | |
b0ef0732 | 868 | |
4cc9cec6 | 869 | /* Continue if no error, because the line will be in inline function */ |
fbee632d | 870 | return ret < 0 ? ret : 0; |
4cc9cec6 | 871 | } |
804b3606 | 872 | |
4cc9cec6 MH |
873 | /* Find probe point from its line number */ |
874 | static int find_probe_point_by_line(struct probe_finder *pf) | |
875 | { | |
876 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); | |
4ea42b18 MH |
877 | } |
878 | ||
2a9c8c36 | 879 | /* Find lines which match lazy pattern */ |
5a62257a | 880 | static int find_lazy_match_lines(struct intlist *list, |
2a9c8c36 MH |
881 | const char *fname, const char *pat) |
882 | { | |
f50c2169 FBH |
883 | FILE *fp; |
884 | char *line = NULL; | |
885 | size_t line_len; | |
886 | ssize_t len; | |
887 | int count = 0, linenum = 1; | |
5f03cba4 | 888 | char sbuf[STRERR_BUFSIZE]; |
f50c2169 FBH |
889 | |
890 | fp = fopen(fname, "r"); | |
891 | if (!fp) { | |
5f03cba4 | 892 | pr_warning("Failed to open %s: %s\n", fname, |
c8b5f2c9 | 893 | str_error_r(errno, sbuf, sizeof(sbuf))); |
b448c4b6 | 894 | return -errno; |
b55a87ad MH |
895 | } |
896 | ||
f50c2169 | 897 | while ((len = getline(&line, &line_len, fp)) > 0) { |
b448c4b6 | 898 | |
f50c2169 FBH |
899 | if (line[len - 1] == '\n') |
900 | line[len - 1] = '\0'; | |
901 | ||
902 | if (strlazymatch(line, pat)) { | |
5a62257a | 903 | intlist__add(list, linenum); |
f50c2169 | 904 | count++; |
2a9c8c36 | 905 | } |
f50c2169 | 906 | linenum++; |
2a9c8c36 | 907 | } |
f50c2169 FBH |
908 | |
909 | if (ferror(fp)) | |
910 | count = -errno; | |
911 | free(line); | |
912 | fclose(fp); | |
913 | ||
914 | if (count == 0) | |
915 | pr_debug("No matched lines found in %s.\n", fname); | |
916 | return count; | |
2a9c8c36 MH |
917 | } |
918 | ||
4cc9cec6 MH |
919 | static int probe_point_lazy_walker(const char *fname, int lineno, |
920 | Dwarf_Addr addr, void *data) | |
921 | { | |
922 | struct probe_finder *pf = data; | |
221d0611 | 923 | Dwarf_Die *sc_die, die_mem; |
4cc9cec6 MH |
924 | int ret; |
925 | ||
5a62257a | 926 | if (!intlist__has_entry(pf->lcache, lineno) || |
4cc9cec6 MH |
927 | strtailcmp(fname, pf->fname) != 0) |
928 | return 0; | |
929 | ||
930 | pr_debug("Probe line found: line:%d addr:0x%llx\n", | |
931 | lineno, (unsigned long long)addr); | |
932 | pf->addr = addr; | |
221d0611 MH |
933 | pf->lno = lineno; |
934 | sc_die = find_best_scope(pf, &die_mem); | |
935 | if (!sc_die) { | |
936 | pr_warning("Failed to find scope of probe point.\n"); | |
937 | return -ENOENT; | |
938 | } | |
939 | ||
940 | ret = call_probe_finder(sc_die, pf); | |
4cc9cec6 MH |
941 | |
942 | /* | |
943 | * Continue if no error, because the lazy pattern will match | |
944 | * to other lines | |
945 | */ | |
5e814dd5 | 946 | return ret < 0 ? ret : 0; |
4cc9cec6 MH |
947 | } |
948 | ||
2a9c8c36 | 949 | /* Find probe points from lazy pattern */ |
b55a87ad | 950 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
2a9c8c36 | 951 | { |
bf541169 | 952 | struct build_id bid; |
7cd5738d | 953 | char sbuild_id[SBUILD_ID_SIZE] = ""; |
b55a87ad | 954 | int ret = 0; |
09ed8975 | 955 | char *fpath; |
2a9c8c36 | 956 | |
5a62257a | 957 | if (intlist__empty(pf->lcache)) { |
09ed8975 NA |
958 | const char *comp_dir; |
959 | ||
960 | comp_dir = cu_get_comp_dir(&pf->cu_die); | |
bf541169 JO |
961 | if (pf->dbg->build_id) { |
962 | build_id__init(&bid, pf->dbg->build_id, BUILD_ID_SIZE); | |
963 | build_id__sprintf(&bid, sbuild_id); | |
964 | } | |
7cd5738d | 965 | ret = find_source_path(pf->fname, sbuild_id, comp_dir, &fpath); |
09ed8975 NA |
966 | if (ret < 0) { |
967 | pr_warning("Failed to find source file path.\n"); | |
968 | return ret; | |
969 | } | |
970 | ||
2a9c8c36 | 971 | /* Matching lazy line pattern */ |
09ed8975 | 972 | ret = find_lazy_match_lines(pf->lcache, fpath, |
4235b045 | 973 | pf->pev->point.lazy_line); |
09ed8975 | 974 | free(fpath); |
f50c2169 | 975 | if (ret <= 0) |
b55a87ad | 976 | return ret; |
2a9c8c36 MH |
977 | } |
978 | ||
4cc9cec6 | 979 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
2a9c8c36 MH |
980 | } |
981 | ||
e47392bf RB |
982 | static void skip_prologue(Dwarf_Die *sp_die, struct probe_finder *pf) |
983 | { | |
984 | struct perf_probe_point *pp = &pf->pev->point; | |
985 | ||
986 | /* Not uprobe? */ | |
987 | if (!pf->pev->uprobes) | |
988 | return; | |
989 | ||
990 | /* Compiled with optimization? */ | |
6243b9dc | 991 | if (die_is_optimized_target(&pf->cu_die)) |
e47392bf RB |
992 | return; |
993 | ||
994 | /* Don't know entrypc? */ | |
995 | if (!pf->addr) | |
996 | return; | |
997 | ||
998 | /* Only FUNC and FUNC@SRC are eligible. */ | |
999 | if (!pp->function || pp->line || pp->retprobe || pp->lazy_line || | |
1000 | pp->offset || pp->abs_address) | |
1001 | return; | |
1002 | ||
1003 | /* Not interested in func parameter? */ | |
1004 | if (!perf_probe_with_var(pf->pev)) | |
1005 | return; | |
1006 | ||
1007 | pr_info("Target program is compiled without optimization. Skipping prologue.\n" | |
1008 | "Probe on address 0x%" PRIx64 " to force probing at the function entry.\n\n", | |
1009 | pf->addr); | |
1010 | ||
6243b9dc | 1011 | die_skip_prologue(sp_die, &pf->cu_die, &pf->addr); |
e47392bf RB |
1012 | } |
1013 | ||
e92b85e1 MH |
1014 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
1015 | { | |
db0d2c64 | 1016 | struct probe_finder *pf = data; |
4235b045 | 1017 | struct perf_probe_point *pp = &pf->pev->point; |
b55a87ad | 1018 | Dwarf_Addr addr; |
db0d2c64 | 1019 | int ret; |
e92b85e1 | 1020 | |
2a9c8c36 | 1021 | if (pp->lazy_line) |
db0d2c64 | 1022 | ret = find_probe_point_lazy(in_die, pf); |
2a9c8c36 MH |
1023 | else { |
1024 | /* Get probe address */ | |
eb6933b2 | 1025 | if (die_entrypc(in_die, &addr) != 0) { |
0e43e5d2 | 1026 | pr_warning("Failed to get entry address of %s.\n", |
b55a87ad | 1027 | dwarf_diename(in_die)); |
db0d2c64 | 1028 | return -ENOENT; |
b55a87ad | 1029 | } |
0ad45b33 MH |
1030 | if (addr == 0) { |
1031 | pr_debug("%s has no valid entry address. skipped.\n", | |
1032 | dwarf_diename(in_die)); | |
1033 | return -ENOENT; | |
1034 | } | |
b55a87ad | 1035 | pf->addr = addr; |
2a9c8c36 MH |
1036 | pf->addr += pp->offset; |
1037 | pr_debug("found inline addr: 0x%jx\n", | |
1038 | (uintmax_t)pf->addr); | |
1039 | ||
db0d2c64 | 1040 | ret = call_probe_finder(in_die, pf); |
2a9c8c36 | 1041 | } |
e92b85e1 | 1042 | |
db0d2c64 | 1043 | return ret; |
e92b85e1 | 1044 | } |
804b3606 | 1045 | |
db0d2c64 MH |
1046 | /* Callback parameter with return value for libdw */ |
1047 | struct dwarf_callback_param { | |
1048 | void *data; | |
1049 | int retval; | |
1050 | }; | |
1051 | ||
4ea42b18 | 1052 | /* Search function from function name */ |
e92b85e1 | 1053 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
4ea42b18 | 1054 | { |
b55a87ad MH |
1055 | struct dwarf_callback_param *param = data; |
1056 | struct probe_finder *pf = param->data; | |
4235b045 | 1057 | struct perf_probe_point *pp = &pf->pev->point; |
4ea42b18 | 1058 | |
e92b85e1 | 1059 | /* Check tag and diename */ |
0dbb1cac | 1060 | if (!die_is_func_def(sp_die) || |
4c859351 | 1061 | !die_match_name(sp_die, pp->function)) |
b55a87ad | 1062 | return DWARF_CB_OK; |
e92b85e1 | 1063 | |
7d21635a MH |
1064 | /* Check declared file */ |
1065 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) | |
1066 | return DWARF_CB_OK; | |
1067 | ||
f8da4b51 MH |
1068 | pr_debug("Matched function: %s [%lx]\n", dwarf_diename(sp_die), |
1069 | (unsigned long)dwarf_dieoffset(sp_die)); | |
2a9c8c36 | 1070 | pf->fname = dwarf_decl_file(sp_die); |
e92b85e1 | 1071 | if (pp->line) { /* Function relative line */ |
e92b85e1 MH |
1072 | dwarf_decl_line(sp_die, &pf->lno); |
1073 | pf->lno += pp->line; | |
b55a87ad | 1074 | param->retval = find_probe_point_by_line(pf); |
e1ecbbc3 MH |
1075 | } else if (die_is_func_instance(sp_die)) { |
1076 | /* Instances always have the entry address */ | |
5d16dbcc | 1077 | die_entrypc(sp_die, &pf->addr); |
0ad45b33 MH |
1078 | /* But in some case the entry address is 0 */ |
1079 | if (pf->addr == 0) { | |
1080 | pr_debug("%s has no entry PC. Skipped\n", | |
1081 | dwarf_diename(sp_die)); | |
1082 | param->retval = 0; | |
e92b85e1 | 1083 | /* Real function */ |
0ad45b33 | 1084 | } else if (pp->lazy_line) |
b55a87ad | 1085 | param->retval = find_probe_point_lazy(sp_die, pf); |
2a9c8c36 | 1086 | else { |
e47392bf | 1087 | skip_prologue(sp_die, pf); |
2a9c8c36 MH |
1088 | pf->addr += pp->offset; |
1089 | /* TODO: Check the address in this function */ | |
cf6eb489 | 1090 | param->retval = call_probe_finder(sp_die, pf); |
2a9c8c36 | 1091 | } |
4c859351 | 1092 | } else if (!probe_conf.no_inlines) { |
e92b85e1 | 1093 | /* Inlined function: search instances */ |
db0d2c64 MH |
1094 | param->retval = die_walk_instances(sp_die, |
1095 | probe_point_inline_cb, (void *)pf); | |
4c859351 | 1096 | /* This could be a non-existed inline definition */ |
f8da4b51 | 1097 | if (param->retval == -ENOENT) |
4c859351 MH |
1098 | param->retval = 0; |
1099 | } | |
1100 | ||
1101 | /* We need to find other candidates */ | |
1102 | if (strisglob(pp->function) && param->retval >= 0) { | |
1103 | param->retval = 0; /* We have to clear the result */ | |
1104 | return DWARF_CB_OK; | |
1105 | } | |
e92b85e1 | 1106 | |
b55a87ad | 1107 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
4ea42b18 MH |
1108 | } |
1109 | ||
b55a87ad | 1110 | static int find_probe_point_by_func(struct probe_finder *pf) |
4ea42b18 | 1111 | { |
b55a87ad MH |
1112 | struct dwarf_callback_param _param = {.data = (void *)pf, |
1113 | .retval = 0}; | |
1114 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); | |
1115 | return _param.retval; | |
4ea42b18 MH |
1116 | } |
1117 | ||
cd25f8bc LM |
1118 | struct pubname_callback_param { |
1119 | char *function; | |
1120 | char *file; | |
1121 | Dwarf_Die *cu_die; | |
1122 | Dwarf_Die *sp_die; | |
1123 | int found; | |
1124 | }; | |
1125 | ||
1126 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) | |
1127 | { | |
1128 | struct pubname_callback_param *param = data; | |
1129 | ||
1130 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { | |
1131 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) | |
1132 | return DWARF_CB_OK; | |
1133 | ||
4c859351 | 1134 | if (die_match_name(param->sp_die, param->function)) { |
cd25f8bc LM |
1135 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
1136 | return DWARF_CB_OK; | |
1137 | ||
1138 | if (param->file && | |
1139 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) | |
1140 | return DWARF_CB_OK; | |
1141 | ||
1142 | param->found = 1; | |
1143 | return DWARF_CB_ABORT; | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | return DWARF_CB_OK; | |
1148 | } | |
1149 | ||
270bde1e | 1150 | static int debuginfo__find_probe_location(struct debuginfo *dbg, |
ff741783 | 1151 | struct probe_finder *pf) |
4ea42b18 | 1152 | { |
cf6eb489 | 1153 | struct perf_probe_point *pp = &pf->pev->point; |
804b3606 MH |
1154 | Dwarf_Off off, noff; |
1155 | size_t cuhl; | |
1156 | Dwarf_Die *diep; | |
b55a87ad | 1157 | int ret = 0; |
804b3606 | 1158 | |
804b3606 | 1159 | off = 0; |
5a62257a MH |
1160 | pf->lcache = intlist__new(NULL); |
1161 | if (!pf->lcache) | |
1162 | return -ENOMEM; | |
cd25f8bc LM |
1163 | |
1164 | /* Fastpath: lookup by function name from .debug_pubnames section */ | |
4c859351 | 1165 | if (pp->function && !strisglob(pp->function)) { |
cd25f8bc LM |
1166 | struct pubname_callback_param pubname_param = { |
1167 | .function = pp->function, | |
1168 | .file = pp->file, | |
1169 | .cu_die = &pf->cu_die, | |
1170 | .sp_die = &pf->sp_die, | |
2b348a77 | 1171 | .found = 0, |
cd25f8bc LM |
1172 | }; |
1173 | struct dwarf_callback_param probe_param = { | |
1174 | .data = pf, | |
1175 | }; | |
1176 | ||
316c7136 | 1177 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1178 | &pubname_param, 0); |
cd25f8bc LM |
1179 | if (pubname_param.found) { |
1180 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); | |
1181 | if (ret) | |
1182 | goto found; | |
1183 | } | |
1184 | } | |
1185 | ||
804b3606 | 1186 | /* Loop on CUs (Compilation Unit) */ |
316c7136 | 1187 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
4ea42b18 | 1188 | /* Get the DIE(Debugging Information Entry) of this CU */ |
316c7136 | 1189 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
804b3606 MH |
1190 | if (!diep) |
1191 | continue; | |
4ea42b18 MH |
1192 | |
1193 | /* Check if target file is included. */ | |
1194 | if (pp->file) | |
cf6eb489 | 1195 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
804b3606 | 1196 | else |
cf6eb489 | 1197 | pf->fname = NULL; |
4ea42b18 | 1198 | |
cf6eb489 | 1199 | if (!pp->file || pf->fname) { |
4ea42b18 | 1200 | if (pp->function) |
cf6eb489 | 1201 | ret = find_probe_point_by_func(pf); |
2a9c8c36 | 1202 | else if (pp->lazy_line) |
f19e80c6 | 1203 | ret = find_probe_point_lazy(&pf->cu_die, pf); |
b0ef0732 | 1204 | else { |
cf6eb489 MH |
1205 | pf->lno = pp->line; |
1206 | ret = find_probe_point_by_line(pf); | |
b0ef0732 | 1207 | } |
8635bf6e | 1208 | if (ret < 0) |
fbee632d | 1209 | break; |
4ea42b18 | 1210 | } |
804b3606 | 1211 | off = noff; |
4ea42b18 | 1212 | } |
cd25f8bc LM |
1213 | |
1214 | found: | |
5a62257a MH |
1215 | intlist__delete(pf->lcache); |
1216 | pf->lcache = NULL; | |
4ea42b18 | 1217 | |
cf6eb489 MH |
1218 | return ret; |
1219 | } | |
1220 | ||
270bde1e HK |
1221 | /* Find probe points from debuginfo */ |
1222 | static int debuginfo__find_probes(struct debuginfo *dbg, | |
1223 | struct probe_finder *pf) | |
1224 | { | |
1225 | int ret = 0; | |
270bde1e HK |
1226 | Elf *elf; |
1227 | GElf_Ehdr ehdr; | |
270bde1e HK |
1228 | |
1229 | if (pf->cfi_eh || pf->cfi_dbg) | |
1230 | return debuginfo__find_probe_location(dbg, pf); | |
1231 | ||
1232 | /* Get the call frame information from this dwarf */ | |
1233 | elf = dwarf_getelf(dbg->dbg); | |
1234 | if (elf == NULL) | |
1235 | return -EINVAL; | |
1236 | ||
1237 | if (gelf_getehdr(elf, &ehdr) == NULL) | |
1238 | return -EINVAL; | |
1239 | ||
293d5b43 MH |
1240 | pf->machine = ehdr.e_machine; |
1241 | ||
1242 | #if _ELFUTILS_PREREQ(0, 142) | |
1243 | do { | |
1244 | GElf_Shdr shdr; | |
1245 | ||
1246 | if (elf_section_by_name(elf, &ehdr, &shdr, ".eh_frame", NULL) && | |
1247 | shdr.sh_type == SHT_PROGBITS) | |
1248 | pf->cfi_eh = dwarf_getcfi_elf(elf); | |
270bde1e | 1249 | |
293d5b43 MH |
1250 | pf->cfi_dbg = dwarf_getcfi(dbg->dbg); |
1251 | } while (0); | |
270bde1e HK |
1252 | #endif |
1253 | ||
1254 | ret = debuginfo__find_probe_location(dbg, pf); | |
1255 | return ret; | |
1256 | } | |
1257 | ||
7969ec77 MH |
1258 | struct local_vars_finder { |
1259 | struct probe_finder *pf; | |
1260 | struct perf_probe_arg *args; | |
f8bffbf1 | 1261 | bool vars; |
7969ec77 MH |
1262 | int max_args; |
1263 | int nargs; | |
1264 | int ret; | |
1265 | }; | |
1266 | ||
1267 | /* Collect available variables in this scope */ | |
1268 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) | |
1269 | { | |
1270 | struct local_vars_finder *vf = data; | |
3d918a12 | 1271 | struct probe_finder *pf = vf->pf; |
7969ec77 MH |
1272 | int tag; |
1273 | ||
1274 | tag = dwarf_tag(die_mem); | |
1275 | if (tag == DW_TAG_formal_parameter || | |
f8bffbf1 | 1276 | (tag == DW_TAG_variable && vf->vars)) { |
7969ec77 | 1277 | if (convert_variable_location(die_mem, vf->pf->addr, |
3d918a12 | 1278 | vf->pf->fb_ops, &pf->sp_die, |
293d5b43 | 1279 | pf->machine, NULL) == 0) { |
7969ec77 MH |
1280 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
1281 | if (vf->args[vf->nargs].var == NULL) { | |
1282 | vf->ret = -ENOMEM; | |
1283 | return DIE_FIND_CB_END; | |
1284 | } | |
1285 | pr_debug(" %s", vf->args[vf->nargs].var); | |
1286 | vf->nargs++; | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | if (dwarf_haspc(die_mem, vf->pf->addr)) | |
1291 | return DIE_FIND_CB_CONTINUE; | |
1292 | else | |
1293 | return DIE_FIND_CB_SIBLING; | |
1294 | } | |
1295 | ||
1296 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, | |
1297 | struct perf_probe_arg *args) | |
1298 | { | |
1299 | Dwarf_Die die_mem; | |
1300 | int i; | |
1301 | int n = 0; | |
f8bffbf1 | 1302 | struct local_vars_finder vf = {.pf = pf, .args = args, .vars = false, |
7969ec77 MH |
1303 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
1304 | ||
1305 | for (i = 0; i < pf->pev->nargs; i++) { | |
1306 | /* var never be NULL */ | |
f8bffbf1 MH |
1307 | if (strcmp(pf->pev->args[i].var, PROBE_ARG_VARS) == 0) |
1308 | vf.vars = true; | |
1309 | else if (strcmp(pf->pev->args[i].var, PROBE_ARG_PARAMS) != 0) { | |
7969ec77 MH |
1310 | /* Copy normal argument */ |
1311 | args[n] = pf->pev->args[i]; | |
1312 | n++; | |
f8bffbf1 | 1313 | continue; |
7969ec77 | 1314 | } |
f8bffbf1 MH |
1315 | pr_debug("Expanding %s into:", pf->pev->args[i].var); |
1316 | vf.nargs = n; | |
1317 | /* Special local variables */ | |
1318 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, | |
1319 | &die_mem); | |
1320 | pr_debug(" (%d)\n", vf.nargs - n); | |
1321 | if (vf.ret < 0) | |
1322 | return vf.ret; | |
1323 | n = vf.nargs; | |
7969ec77 MH |
1324 | } |
1325 | return n; | |
1326 | } | |
1327 | ||
1a375ae7 MH |
1328 | static bool trace_event_finder_overlap(struct trace_event_finder *tf) |
1329 | { | |
1330 | int i; | |
1331 | ||
1332 | for (i = 0; i < tf->ntevs; i++) { | |
1333 | if (tf->pf.addr == tf->tevs[i].point.address) | |
1334 | return true; | |
1335 | } | |
1336 | return false; | |
1337 | } | |
1338 | ||
cf6eb489 | 1339 | /* Add a found probe point into trace event list */ |
221d0611 | 1340 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1341 | { |
1342 | struct trace_event_finder *tf = | |
1343 | container_of(pf, struct trace_event_finder, pf); | |
6cca13bd | 1344 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1345 | struct probe_trace_event *tev; |
092b1f0b | 1346 | struct perf_probe_arg *args = NULL; |
cf6eb489 MH |
1347 | int ret, i; |
1348 | ||
1a375ae7 MH |
1349 | /* |
1350 | * For some reason (e.g. different column assigned to same address) | |
1351 | * This callback can be called with the address which already passed. | |
1352 | * Ignore it first. | |
1353 | */ | |
1354 | if (trace_event_finder_overlap(tf)) | |
1355 | return 0; | |
1356 | ||
cf6eb489 MH |
1357 | /* Check number of tevs */ |
1358 | if (tf->ntevs == tf->max_tevs) { | |
1359 | pr_warning("Too many( > %d) probe point found.\n", | |
1360 | tf->max_tevs); | |
1361 | return -ERANGE; | |
1362 | } | |
1363 | tev = &tf->tevs[tf->ntevs++]; | |
1364 | ||
221d0611 | 1365 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1366 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
6cca13bd | 1367 | pp->retprobe, pp->function, &tev->point); |
cf6eb489 | 1368 | if (ret < 0) |
092b1f0b | 1369 | goto end; |
cf6eb489 | 1370 | |
4c859351 | 1371 | tev->point.realname = strdup(dwarf_diename(sc_die)); |
092b1f0b WN |
1372 | if (!tev->point.realname) { |
1373 | ret = -ENOMEM; | |
1374 | goto end; | |
1375 | } | |
4c859351 | 1376 | |
cf6eb489 MH |
1377 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
1378 | tev->point.offset); | |
1379 | ||
7969ec77 MH |
1380 | /* Expand special probe argument if exist */ |
1381 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); | |
092b1f0b WN |
1382 | if (args == NULL) { |
1383 | ret = -ENOMEM; | |
1384 | goto end; | |
1385 | } | |
7969ec77 MH |
1386 | |
1387 | ret = expand_probe_args(sc_die, pf, args); | |
1388 | if (ret < 0) | |
1389 | goto end; | |
1390 | ||
1391 | tev->nargs = ret; | |
1392 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); | |
1393 | if (tev->args == NULL) { | |
1394 | ret = -ENOMEM; | |
1395 | goto end; | |
1396 | } | |
1397 | ||
1398 | /* Find each argument */ | |
1399 | for (i = 0; i < tev->nargs; i++) { | |
1400 | pf->pvar = &args[i]; | |
cf6eb489 | 1401 | pf->tvar = &tev->args[i]; |
221d0611 MH |
1402 | /* Variable should be found from scope DIE */ |
1403 | ret = find_variable(sc_die, pf); | |
cf6eb489 | 1404 | if (ret != 0) |
7969ec77 | 1405 | break; |
cf6eb489 MH |
1406 | } |
1407 | ||
7969ec77 | 1408 | end: |
092b1f0b WN |
1409 | if (ret) { |
1410 | clear_probe_trace_event(tev); | |
1411 | tf->ntevs--; | |
1412 | } | |
7969ec77 MH |
1413 | free(args); |
1414 | return ret; | |
cf6eb489 MH |
1415 | } |
1416 | ||
cb402730 MH |
1417 | static int fill_empty_trace_arg(struct perf_probe_event *pev, |
1418 | struct probe_trace_event *tevs, int ntevs) | |
1419 | { | |
1420 | char **valp; | |
1421 | char *type; | |
1422 | int i, j, ret; | |
1423 | ||
11fd3eb8 MH |
1424 | if (!ntevs) |
1425 | return -ENOENT; | |
1426 | ||
cb402730 MH |
1427 | for (i = 0; i < pev->nargs; i++) { |
1428 | type = NULL; | |
1429 | for (j = 0; j < ntevs; j++) { | |
1430 | if (tevs[j].args[i].value) { | |
1431 | type = tevs[j].args[i].type; | |
1432 | break; | |
1433 | } | |
1434 | } | |
1435 | if (j == ntevs) { | |
1436 | print_var_not_found(pev->args[i].var); | |
1437 | return -ENOENT; | |
1438 | } | |
1439 | for (j = 0; j < ntevs; j++) { | |
1440 | valp = &tevs[j].args[i].value; | |
1441 | if (*valp) | |
1442 | continue; | |
1443 | ||
1444 | ret = asprintf(valp, "\\%lx", probe_conf.magic_num); | |
1445 | if (ret < 0) | |
1446 | return -ENOMEM; | |
1447 | /* Note that type can be NULL */ | |
1448 | if (type) { | |
1449 | tevs[j].args[i].type = strdup(type); | |
1450 | if (!tevs[j].args[i].type) | |
1451 | return -ENOMEM; | |
1452 | } | |
1453 | } | |
1454 | } | |
1455 | return 0; | |
1456 | } | |
1457 | ||
cf6eb489 | 1458 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ |
316c7136 | 1459 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
ff741783 | 1460 | struct perf_probe_event *pev, |
ddb2f58f | 1461 | struct probe_trace_event **tevs) |
cf6eb489 MH |
1462 | { |
1463 | struct trace_event_finder tf = { | |
7cd5738d | 1464 | .pf = {.pev = pev, .dbg = dbg, .callback = add_probe_trace_event}, |
ddb2f58f | 1465 | .max_tevs = probe_conf.max_probes, .mod = dbg->mod}; |
0196e787 | 1466 | int ret, i; |
cf6eb489 MH |
1467 | |
1468 | /* Allocate result tevs array */ | |
ddb2f58f | 1469 | *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs); |
cf6eb489 MH |
1470 | if (*tevs == NULL) |
1471 | return -ENOMEM; | |
1472 | ||
1473 | tf.tevs = *tevs; | |
1474 | tf.ntevs = 0; | |
1475 | ||
cb402730 MH |
1476 | if (pev->nargs != 0 && immediate_value_is_supported()) |
1477 | tf.pf.skip_empty_arg = true; | |
1478 | ||
316c7136 | 1479 | ret = debuginfo__find_probes(dbg, &tf.pf); |
cb402730 MH |
1480 | if (ret >= 0 && tf.pf.skip_empty_arg) |
1481 | ret = fill_empty_trace_arg(pev, tf.tevs, tf.ntevs); | |
1482 | ||
12d572e7 | 1483 | if (ret < 0 || tf.ntevs == 0) { |
0196e787 MH |
1484 | for (i = 0; i < tf.ntevs; i++) |
1485 | clear_probe_trace_event(&tf.tevs[i]); | |
04662523 | 1486 | zfree(tevs); |
cf6eb489 MH |
1487 | return ret; |
1488 | } | |
1489 | ||
1490 | return (ret < 0) ? ret : tf.ntevs; | |
1491 | } | |
1492 | ||
cf6eb489 MH |
1493 | /* Collect available variables in this scope */ |
1494 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) | |
1495 | { | |
1496 | struct available_var_finder *af = data; | |
1497 | struct variable_list *vl; | |
bf4d5f25 | 1498 | struct strbuf buf = STRBUF_INIT; |
cf6eb489 MH |
1499 | int tag, ret; |
1500 | ||
1501 | vl = &af->vls[af->nvls - 1]; | |
1502 | ||
1503 | tag = dwarf_tag(die_mem); | |
1504 | if (tag == DW_TAG_formal_parameter || | |
1505 | tag == DW_TAG_variable) { | |
1506 | ret = convert_variable_location(die_mem, af->pf.addr, | |
3d918a12 | 1507 | af->pf.fb_ops, &af->pf.sp_die, |
293d5b43 | 1508 | af->pf.machine, NULL); |
349e8d26 HK |
1509 | if (ret == 0 || ret == -ERANGE) { |
1510 | int ret2; | |
1511 | bool externs = !af->child; | |
fb9596d1 | 1512 | |
bf4d5f25 MH |
1513 | if (strbuf_init(&buf, 64) < 0) |
1514 | goto error; | |
349e8d26 HK |
1515 | |
1516 | if (probe_conf.show_location_range) { | |
bf4d5f25 MH |
1517 | if (!externs) |
1518 | ret2 = strbuf_add(&buf, | |
1519 | ret ? "[INV]\t" : "[VAL]\t", 6); | |
1520 | else | |
1521 | ret2 = strbuf_add(&buf, "[EXT]\t", 6); | |
1522 | if (ret2) | |
1523 | goto error; | |
349e8d26 HK |
1524 | } |
1525 | ||
1526 | ret2 = die_get_varname(die_mem, &buf); | |
1527 | ||
1528 | if (!ret2 && probe_conf.show_location_range && | |
1529 | !externs) { | |
bf4d5f25 MH |
1530 | if (strbuf_addch(&buf, '\t') < 0) |
1531 | goto error; | |
349e8d26 HK |
1532 | ret2 = die_get_var_range(&af->pf.sp_die, |
1533 | die_mem, &buf); | |
1534 | } | |
1535 | ||
1536 | pr_debug("Add new var: %s\n", buf.buf); | |
1537 | if (ret2 == 0) { | |
fb9596d1 HK |
1538 | strlist__add(vl->vars, |
1539 | strbuf_detach(&buf, NULL)); | |
bf4d5f25 MH |
1540 | } |
1541 | strbuf_release(&buf); | |
cf6eb489 MH |
1542 | } |
1543 | } | |
1544 | ||
fb8c5a56 | 1545 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
cf6eb489 MH |
1546 | return DIE_FIND_CB_CONTINUE; |
1547 | else | |
1548 | return DIE_FIND_CB_SIBLING; | |
bf4d5f25 MH |
1549 | error: |
1550 | strbuf_release(&buf); | |
1551 | pr_debug("Error in strbuf\n"); | |
1552 | return DIE_FIND_CB_END; | |
cf6eb489 MH |
1553 | } |
1554 | ||
dee36a2a MH |
1555 | static bool available_var_finder_overlap(struct available_var_finder *af) |
1556 | { | |
1557 | int i; | |
1558 | ||
1559 | for (i = 0; i < af->nvls; i++) { | |
1560 | if (af->pf.addr == af->vls[i].point.address) | |
1561 | return true; | |
1562 | } | |
1563 | return false; | |
1564 | ||
1565 | } | |
1566 | ||
cf6eb489 | 1567 | /* Add a found vars into available variables list */ |
221d0611 | 1568 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
cf6eb489 MH |
1569 | { |
1570 | struct available_var_finder *af = | |
1571 | container_of(pf, struct available_var_finder, pf); | |
6cca13bd | 1572 | struct perf_probe_point *pp = &pf->pev->point; |
cf6eb489 | 1573 | struct variable_list *vl; |
f182e3e1 MH |
1574 | Dwarf_Die die_mem; |
1575 | int ret; | |
cf6eb489 | 1576 | |
dee36a2a MH |
1577 | /* |
1578 | * For some reason (e.g. different column assigned to same address), | |
1579 | * this callback can be called with the address which already passed. | |
1580 | * Ignore it first. | |
1581 | */ | |
1582 | if (available_var_finder_overlap(af)) | |
1583 | return 0; | |
1584 | ||
cf6eb489 MH |
1585 | /* Check number of tevs */ |
1586 | if (af->nvls == af->max_vls) { | |
1587 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); | |
1588 | return -ERANGE; | |
1589 | } | |
1590 | vl = &af->vls[af->nvls++]; | |
1591 | ||
221d0611 | 1592 | /* Trace point should be converted from subprogram DIE */ |
576b5237 | 1593 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
6cca13bd | 1594 | pp->retprobe, pp->function, &vl->point); |
cf6eb489 MH |
1595 | if (ret < 0) |
1596 | return ret; | |
1597 | ||
1598 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, | |
1599 | vl->point.offset); | |
1600 | ||
1601 | /* Find local variables */ | |
4a77e218 | 1602 | vl->vars = strlist__new(NULL, NULL); |
cf6eb489 MH |
1603 | if (vl->vars == NULL) |
1604 | return -ENOMEM; | |
fb8c5a56 | 1605 | af->child = true; |
221d0611 | 1606 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
cf6eb489 | 1607 | |
fb8c5a56 | 1608 | /* Find external variables */ |
ddb2f58f | 1609 | if (!probe_conf.show_ext_vars) |
fb8c5a56 | 1610 | goto out; |
ddb2f58f | 1611 | /* Don't need to search child DIE for external vars. */ |
fb8c5a56 | 1612 | af->child = false; |
f182e3e1 | 1613 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
fb8c5a56 MH |
1614 | |
1615 | out: | |
cf6eb489 MH |
1616 | if (strlist__empty(vl->vars)) { |
1617 | strlist__delete(vl->vars); | |
1618 | vl->vars = NULL; | |
1619 | } | |
1620 | ||
1621 | return ret; | |
1622 | } | |
1623 | ||
69e96eaa MH |
1624 | /* |
1625 | * Find available variables at given probe point | |
1626 | * Return the number of found probe points. Return 0 if there is no | |
1627 | * matched probe point. Return <0 if an error occurs. | |
1628 | */ | |
316c7136 | 1629 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
ff741783 | 1630 | struct perf_probe_event *pev, |
ddb2f58f | 1631 | struct variable_list **vls) |
cf6eb489 MH |
1632 | { |
1633 | struct available_var_finder af = { | |
7cd5738d | 1634 | .pf = {.pev = pev, .dbg = dbg, .callback = add_available_vars}, |
316c7136 | 1635 | .mod = dbg->mod, |
ddb2f58f | 1636 | .max_vls = probe_conf.max_probes}; |
cf6eb489 MH |
1637 | int ret; |
1638 | ||
1639 | /* Allocate result vls array */ | |
ddb2f58f | 1640 | *vls = zalloc(sizeof(struct variable_list) * af.max_vls); |
cf6eb489 MH |
1641 | if (*vls == NULL) |
1642 | return -ENOMEM; | |
1643 | ||
1644 | af.vls = *vls; | |
1645 | af.nvls = 0; | |
1646 | ||
316c7136 | 1647 | ret = debuginfo__find_probes(dbg, &af.pf); |
cf6eb489 MH |
1648 | if (ret < 0) { |
1649 | /* Free vlist for error */ | |
1650 | while (af.nvls--) { | |
74cf249d | 1651 | zfree(&af.vls[af.nvls].point.symbol); |
f5385650 | 1652 | strlist__delete(af.vls[af.nvls].vars); |
cf6eb489 | 1653 | } |
04662523 | 1654 | zfree(vls); |
cf6eb489 MH |
1655 | return ret; |
1656 | } | |
1657 | ||
1658 | return (ret < 0) ? ret : af.nvls; | |
4ea42b18 MH |
1659 | } |
1660 | ||
9b239a12 | 1661 | /* For the kernel module, we need a special code to get a DIE */ |
613f050d MH |
1662 | int debuginfo__get_text_offset(struct debuginfo *dbg, Dwarf_Addr *offs, |
1663 | bool adjust_offset) | |
9b239a12 MH |
1664 | { |
1665 | int n, i; | |
1666 | Elf32_Word shndx; | |
1667 | Elf_Scn *scn; | |
1668 | Elf *elf; | |
1669 | GElf_Shdr mem, *shdr; | |
1670 | const char *p; | |
1671 | ||
1672 | elf = dwfl_module_getelf(dbg->mod, &dbg->bias); | |
1673 | if (!elf) | |
1674 | return -EINVAL; | |
1675 | ||
1676 | /* Get the number of relocations */ | |
1677 | n = dwfl_module_relocations(dbg->mod); | |
1678 | if (n < 0) | |
1679 | return -ENOENT; | |
1680 | /* Search the relocation related .text section */ | |
1681 | for (i = 0; i < n; i++) { | |
1682 | p = dwfl_module_relocation_info(dbg->mod, i, &shndx); | |
1683 | if (strcmp(p, ".text") == 0) { | |
1684 | /* OK, get the section header */ | |
1685 | scn = elf_getscn(elf, shndx); | |
1686 | if (!scn) | |
1687 | return -ENOENT; | |
1688 | shdr = gelf_getshdr(scn, &mem); | |
1689 | if (!shdr) | |
1690 | return -ENOENT; | |
1691 | *offs = shdr->sh_addr; | |
613f050d MH |
1692 | if (adjust_offset) |
1693 | *offs -= shdr->sh_offset; | |
9b239a12 MH |
1694 | } |
1695 | } | |
1696 | return 0; | |
1697 | } | |
1698 | ||
fb1587d8 | 1699 | /* Reverse search */ |
316c7136 | 1700 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
ff741783 | 1701 | struct perf_probe_point *ppt) |
fb1587d8 MH |
1702 | { |
1703 | Dwarf_Die cudie, spdie, indie; | |
e08cfd4b MH |
1704 | Dwarf_Addr _addr = 0, baseaddr = 0; |
1705 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; | |
1d46ea2a | 1706 | int baseline = 0, lineno = 0, ret = 0; |
fb1587d8 | 1707 | |
d2d4edbe | 1708 | /* We always need to relocate the address for aranges */ |
613f050d | 1709 | if (debuginfo__get_text_offset(dbg, &baseaddr, false) == 0) |
d2d4edbe | 1710 | addr += baseaddr; |
fb1587d8 | 1711 | /* Find cu die */ |
0104fe69 | 1712 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr, &cudie)) { |
0e43e5d2 MH |
1713 | pr_warning("Failed to find debug information for address %lx\n", |
1714 | addr); | |
75ec5a24 MH |
1715 | ret = -EINVAL; |
1716 | goto end; | |
1717 | } | |
fb1587d8 | 1718 | |
1d46ea2a MH |
1719 | /* Find a corresponding line (filename and lineno) */ |
1720 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); | |
1721 | /* Don't care whether it failed or not */ | |
fb1587d8 | 1722 | |
1d46ea2a | 1723 | /* Find a corresponding function (name, baseline and baseaddr) */ |
e0d153c6 | 1724 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
1d46ea2a | 1725 | /* Get function entry information */ |
e08cfd4b MH |
1726 | func = basefunc = dwarf_diename(&spdie); |
1727 | if (!func || | |
3895534d | 1728 | die_entrypc(&spdie, &baseaddr) != 0 || |
e08cfd4b MH |
1729 | dwarf_decl_line(&spdie, &baseline) != 0) { |
1730 | lineno = 0; | |
1d46ea2a | 1731 | goto post; |
e08cfd4b | 1732 | } |
1d46ea2a | 1733 | |
1b286bdd | 1734 | fname = dwarf_decl_file(&spdie); |
e08cfd4b | 1735 | if (addr == (unsigned long)baseaddr) { |
1d46ea2a MH |
1736 | /* Function entry - Relative line number is 0 */ |
1737 | lineno = baseline; | |
e08cfd4b MH |
1738 | goto post; |
1739 | } | |
1740 | ||
1741 | /* Track down the inline functions step by step */ | |
1742 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, | |
1743 | &indie)) { | |
1744 | /* There is an inline function */ | |
3895534d | 1745 | if (die_entrypc(&indie, &_addr) == 0 && |
e08cfd4b | 1746 | _addr == addr) { |
1d46ea2a MH |
1747 | /* |
1748 | * addr is at an inline function entry. | |
1749 | * In this case, lineno should be the call-site | |
e08cfd4b | 1750 | * line number. (overwrite lineinfo) |
1d46ea2a MH |
1751 | */ |
1752 | lineno = die_get_call_lineno(&indie); | |
e08cfd4b MH |
1753 | fname = die_get_call_file(&indie); |
1754 | break; | |
1755 | } else { | |
1d46ea2a MH |
1756 | /* |
1757 | * addr is in an inline function body. | |
1758 | * Since lineno points one of the lines | |
1759 | * of the inline function, baseline should | |
1760 | * be the entry line of the inline function. | |
1761 | */ | |
b55a87ad | 1762 | tmp = dwarf_diename(&indie); |
e08cfd4b MH |
1763 | if (!tmp || |
1764 | dwarf_decl_line(&indie, &baseline) != 0) | |
1765 | break; | |
1766 | func = tmp; | |
1767 | spdie = indie; | |
b55a87ad | 1768 | } |
fb1587d8 | 1769 | } |
e08cfd4b MH |
1770 | /* Verify the lineno and baseline are in a same file */ |
1771 | tmp = dwarf_decl_file(&spdie); | |
1772 | if (!tmp || strcmp(tmp, fname) != 0) | |
1773 | lineno = 0; | |
1d46ea2a MH |
1774 | } |
1775 | ||
1776 | post: | |
1777 | /* Make a relative line number or an offset */ | |
1778 | if (lineno) | |
1779 | ppt->line = lineno - baseline; | |
e08cfd4b | 1780 | else if (basefunc) { |
1d46ea2a | 1781 | ppt->offset = addr - (unsigned long)baseaddr; |
e08cfd4b MH |
1782 | func = basefunc; |
1783 | } | |
1d46ea2a MH |
1784 | |
1785 | /* Duplicate strings */ | |
1786 | if (func) { | |
1787 | ppt->function = strdup(func); | |
02b95dad MH |
1788 | if (ppt->function == NULL) { |
1789 | ret = -ENOMEM; | |
1790 | goto end; | |
1791 | } | |
fb1587d8 | 1792 | } |
1d46ea2a MH |
1793 | if (fname) { |
1794 | ppt->file = strdup(fname); | |
1795 | if (ppt->file == NULL) { | |
04662523 | 1796 | zfree(&ppt->function); |
1d46ea2a MH |
1797 | ret = -ENOMEM; |
1798 | goto end; | |
1799 | } | |
1800 | } | |
fb1587d8 | 1801 | end: |
1d46ea2a MH |
1802 | if (ret == 0 && (fname || func)) |
1803 | ret = 1; /* Found a point */ | |
fb1587d8 MH |
1804 | return ret; |
1805 | } | |
1806 | ||
f6c903f5 MH |
1807 | /* Add a line and store the src path */ |
1808 | static int line_range_add_line(const char *src, unsigned int lineno, | |
1809 | struct line_range *lr) | |
1810 | { | |
7cf0b79e | 1811 | /* Copy source path */ |
f6c903f5 | 1812 | if (!lr->path) { |
7cf0b79e MH |
1813 | lr->path = strdup(src); |
1814 | if (lr->path == NULL) | |
1815 | return -ENOMEM; | |
f6c903f5 | 1816 | } |
5a62257a | 1817 | return intlist__add(lr->line_list, lineno); |
f6c903f5 MH |
1818 | } |
1819 | ||
4cc9cec6 | 1820 | static int line_range_walk_cb(const char *fname, int lineno, |
1d037ca1 | 1821 | Dwarf_Addr addr __maybe_unused, |
4cc9cec6 | 1822 | void *data) |
f6c903f5 | 1823 | { |
4cc9cec6 | 1824 | struct line_finder *lf = data; |
499144c8 MH |
1825 | const char *__fname; |
1826 | int __lineno; | |
202c7c12 | 1827 | int err; |
f6c903f5 | 1828 | |
4cc9cec6 | 1829 | if ((strtailcmp(fname, lf->fname) != 0) || |
f6c903f5 | 1830 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
4cc9cec6 | 1831 | return 0; |
f6c903f5 | 1832 | |
499144c8 MH |
1833 | /* Make sure this line can be reversable */ |
1834 | if (cu_find_lineinfo(&lf->cu_die, addr, &__fname, &__lineno) > 0 | |
1835 | && (lineno != __lineno || strcmp(fname, __fname))) | |
1836 | return 0; | |
1837 | ||
202c7c12 NK |
1838 | err = line_range_add_line(fname, lineno, lf->lr); |
1839 | if (err < 0 && err != -EEXIST) | |
1840 | return err; | |
f6c903f5 | 1841 | |
4cc9cec6 | 1842 | return 0; |
f6c903f5 | 1843 | } |
fb1587d8 | 1844 | |
631c9def | 1845 | /* Find line range from its line number */ |
b55a87ad | 1846 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
631c9def | 1847 | { |
4cc9cec6 | 1848 | int ret; |
f6c903f5 | 1849 | |
4cc9cec6 | 1850 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
f6c903f5 | 1851 | |
804b3606 | 1852 | /* Update status */ |
f6c903f5 | 1853 | if (ret >= 0) |
5a62257a | 1854 | if (!intlist__empty(lf->lr->line_list)) |
f6c903f5 MH |
1855 | ret = lf->found = 1; |
1856 | else | |
1857 | ret = 0; /* Lines are not found */ | |
804b3606 | 1858 | else { |
04662523 | 1859 | zfree(&lf->lr->path); |
804b3606 | 1860 | } |
f6c903f5 | 1861 | return ret; |
631c9def MH |
1862 | } |
1863 | ||
161a26b0 MH |
1864 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
1865 | { | |
182c228e | 1866 | int ret = find_line_range_by_line(in_die, data); |
36c0c588 MH |
1867 | |
1868 | /* | |
1869 | * We have to check all instances of inlined function, because | |
1870 | * some execution paths can be optimized out depends on the | |
182c228e MH |
1871 | * function argument of instances. However, if an error occurs, |
1872 | * it should be handled by the caller. | |
36c0c588 | 1873 | */ |
182c228e | 1874 | return ret < 0 ? ret : 0; |
161a26b0 MH |
1875 | } |
1876 | ||
0dbb1cac | 1877 | /* Search function definition from function name */ |
e92b85e1 | 1878 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
631c9def | 1879 | { |
b55a87ad MH |
1880 | struct dwarf_callback_param *param = data; |
1881 | struct line_finder *lf = param->data; | |
631c9def | 1882 | struct line_range *lr = lf->lr; |
631c9def | 1883 | |
7d21635a MH |
1884 | /* Check declared file */ |
1885 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) | |
1886 | return DWARF_CB_OK; | |
1887 | ||
a9ffd048 | 1888 | if (die_match_name(sp_die, lr->function) && die_is_func_def(sp_die)) { |
e92b85e1 MH |
1889 | lf->fname = dwarf_decl_file(sp_die); |
1890 | dwarf_decl_line(sp_die, &lr->offset); | |
804b3606 | 1891 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
631c9def | 1892 | lf->lno_s = lr->offset + lr->start; |
d3b63d7a MH |
1893 | if (lf->lno_s < 0) /* Overflow */ |
1894 | lf->lno_s = INT_MAX; | |
1895 | lf->lno_e = lr->offset + lr->end; | |
1896 | if (lf->lno_e < 0) /* Overflow */ | |
804b3606 | 1897 | lf->lno_e = INT_MAX; |
d3b63d7a | 1898 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
631c9def MH |
1899 | lr->start = lf->lno_s; |
1900 | lr->end = lf->lno_e; | |
e1ecbbc3 | 1901 | if (!die_is_func_instance(sp_die)) |
db0d2c64 MH |
1902 | param->retval = die_walk_instances(sp_die, |
1903 | line_range_inline_cb, lf); | |
1904 | else | |
b55a87ad MH |
1905 | param->retval = find_line_range_by_line(sp_die, lf); |
1906 | return DWARF_CB_ABORT; | |
631c9def | 1907 | } |
b55a87ad | 1908 | return DWARF_CB_OK; |
631c9def MH |
1909 | } |
1910 | ||
b55a87ad | 1911 | static int find_line_range_by_func(struct line_finder *lf) |
631c9def | 1912 | { |
b55a87ad MH |
1913 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
1914 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); | |
1915 | return param.retval; | |
631c9def MH |
1916 | } |
1917 | ||
316c7136 | 1918 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
631c9def | 1919 | { |
804b3606 | 1920 | struct line_finder lf = {.lr = lr, .found = 0}; |
b55a87ad | 1921 | int ret = 0; |
804b3606 MH |
1922 | Dwarf_Off off = 0, noff; |
1923 | size_t cuhl; | |
1924 | Dwarf_Die *diep; | |
6a330a3c | 1925 | const char *comp_dir; |
804b3606 | 1926 | |
cd25f8bc LM |
1927 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
1928 | if (lr->function) { | |
1929 | struct pubname_callback_param pubname_param = { | |
1930 | .function = lr->function, .file = lr->file, | |
1931 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; | |
1932 | struct dwarf_callback_param line_range_param = { | |
1933 | .data = (void *)&lf, .retval = 0}; | |
1934 | ||
316c7136 | 1935 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
ff741783 | 1936 | &pubname_param, 0); |
cd25f8bc LM |
1937 | if (pubname_param.found) { |
1938 | line_range_search_cb(&lf.sp_die, &line_range_param); | |
1939 | if (lf.found) | |
1940 | goto found; | |
1941 | } | |
1942 | } | |
1943 | ||
804b3606 | 1944 | /* Loop on CUs (Compilation Unit) */ |
b55a87ad | 1945 | while (!lf.found && ret >= 0) { |
316c7136 | 1946 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
ff741783 | 1947 | NULL, NULL, NULL) != 0) |
631c9def MH |
1948 | break; |
1949 | ||
1950 | /* Get the DIE(Debugging Information Entry) of this CU */ | |
316c7136 | 1951 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
804b3606 MH |
1952 | if (!diep) |
1953 | continue; | |
631c9def MH |
1954 | |
1955 | /* Check if target file is included. */ | |
1956 | if (lr->file) | |
2a9c8c36 | 1957 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
804b3606 | 1958 | else |
2a9c8c36 | 1959 | lf.fname = 0; |
631c9def | 1960 | |
2a9c8c36 | 1961 | if (!lr->file || lf.fname) { |
631c9def | 1962 | if (lr->function) |
b55a87ad | 1963 | ret = find_line_range_by_func(&lf); |
631c9def MH |
1964 | else { |
1965 | lf.lno_s = lr->start; | |
d3b63d7a | 1966 | lf.lno_e = lr->end; |
b55a87ad | 1967 | ret = find_line_range_by_line(NULL, &lf); |
631c9def | 1968 | } |
631c9def | 1969 | } |
804b3606 | 1970 | off = noff; |
631c9def | 1971 | } |
6a330a3c | 1972 | |
cd25f8bc | 1973 | found: |
6a330a3c MH |
1974 | /* Store comp_dir */ |
1975 | if (lf.found) { | |
1976 | comp_dir = cu_get_comp_dir(&lf.cu_die); | |
1977 | if (comp_dir) { | |
1978 | lr->comp_dir = strdup(comp_dir); | |
1979 | if (!lr->comp_dir) | |
1980 | ret = -ENOMEM; | |
1981 | } | |
1982 | } | |
1983 | ||
7cf0b79e | 1984 | pr_debug("path: %s\n", lr->path); |
b55a87ad | 1985 | return (ret < 0) ? ret : lf.found; |
631c9def MH |
1986 | } |
1987 | ||
7cd5738d MH |
1988 | #ifdef HAVE_DEBUGINFOD_SUPPORT |
1989 | /* debuginfod doesn't require the comp_dir but buildid is required */ | |
1990 | static int get_source_from_debuginfod(const char *raw_path, | |
1991 | const char *sbuild_id, char **new_path) | |
1992 | { | |
1993 | debuginfod_client *c = debuginfod_begin(); | |
1994 | const char *p = raw_path; | |
1995 | int fd; | |
1996 | ||
1997 | if (!c) | |
1998 | return -ENOMEM; | |
1999 | ||
2000 | fd = debuginfod_find_source(c, (const unsigned char *)sbuild_id, | |
2001 | 0, p, new_path); | |
2002 | pr_debug("Search %s from debuginfod -> %d\n", p, fd); | |
2003 | if (fd >= 0) | |
2004 | close(fd); | |
2005 | debuginfod_end(c); | |
2006 | if (fd < 0) { | |
2007 | pr_debug("Failed to find %s in debuginfod (%s)\n", | |
2008 | raw_path, sbuild_id); | |
2009 | return -ENOENT; | |
2010 | } | |
2011 | pr_debug("Got a source %s\n", *new_path); | |
2012 | ||
2013 | return 0; | |
2014 | } | |
2015 | #else | |
2016 | static inline int get_source_from_debuginfod(const char *raw_path __maybe_unused, | |
2017 | const char *sbuild_id __maybe_unused, | |
2018 | char **new_path __maybe_unused) | |
2019 | { | |
2020 | return -ENOTSUP; | |
2021 | } | |
2022 | #endif | |
09ed8975 NA |
2023 | /* |
2024 | * Find a src file from a DWARF tag path. Prepend optional source path prefix | |
2025 | * and chop off leading directories that do not exist. Result is passed back as | |
2026 | * a newly allocated path on success. | |
2027 | * Return 0 if file was found and readable, -errno otherwise. | |
2028 | */ | |
7cd5738d MH |
2029 | int find_source_path(const char *raw_path, const char *sbuild_id, |
2030 | const char *comp_dir, char **new_path) | |
09ed8975 NA |
2031 | { |
2032 | const char *prefix = symbol_conf.source_prefix; | |
2033 | ||
7cd5738d MH |
2034 | if (sbuild_id && !prefix) { |
2035 | if (!get_source_from_debuginfod(raw_path, sbuild_id, new_path)) | |
2036 | return 0; | |
2037 | } | |
2038 | ||
09ed8975 NA |
2039 | if (!prefix) { |
2040 | if (raw_path[0] != '/' && comp_dir) | |
2041 | /* If not an absolute path, try to use comp_dir */ | |
2042 | prefix = comp_dir; | |
2043 | else { | |
2044 | if (access(raw_path, R_OK) == 0) { | |
2045 | *new_path = strdup(raw_path); | |
2046 | return *new_path ? 0 : -ENOMEM; | |
2047 | } else | |
2048 | return -errno; | |
2049 | } | |
2050 | } | |
2051 | ||
2052 | *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); | |
2053 | if (!*new_path) | |
2054 | return -ENOMEM; | |
2055 | ||
2056 | for (;;) { | |
2057 | sprintf(*new_path, "%s/%s", prefix, raw_path); | |
2058 | ||
2059 | if (access(*new_path, R_OK) == 0) | |
2060 | return 0; | |
2061 | ||
2062 | if (!symbol_conf.source_prefix) { | |
2063 | /* In case of searching comp_dir, don't retry */ | |
2064 | zfree(new_path); | |
2065 | return -errno; | |
2066 | } | |
2067 | ||
2068 | switch (errno) { | |
2069 | case ENAMETOOLONG: | |
2070 | case ENOENT: | |
2071 | case EROFS: | |
2072 | case EFAULT: | |
2073 | raw_path = strchr(++raw_path, '/'); | |
2074 | if (!raw_path) { | |
2075 | zfree(new_path); | |
2076 | return -ENOENT; | |
2077 | } | |
2078 | continue; | |
2079 | ||
2080 | default: | |
2081 | zfree(new_path); | |
2082 | return -errno; | |
2083 | } | |
2084 | } | |
2085 | } |